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simdjson/singleheader/simdjson.cpp

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/* auto-generated on Mon Jul 6 18:16:52 EDT 2020. Do not edit! */
/* begin file src/simdjson.cpp */
#include "simdjson.h"
SIMDJSON_PUSH_DISABLE_WARNINGS
SIMDJSON_DISABLE_UNDESIRED_WARNINGS
/* begin file src/error.cpp */
namespace simdjson {
namespace internal {
SIMDJSON_DLLIMPORTEXPORT const error_code_info error_codes[] {
{ SUCCESS, "No error" },
{ CAPACITY, "This parser can't support a document that big" },
{ MEMALLOC, "Error allocating memory, we're most likely out of memory" },
{ TAPE_ERROR, "The JSON document has an improper structure: missing or superfluous commas, braces, missing keys, etc." },
{ DEPTH_ERROR, "The JSON document was too deep (too many nested objects and arrays)" },
{ STRING_ERROR, "Problem while parsing a string" },
{ T_ATOM_ERROR, "Problem while parsing an atom starting with the letter 't'" },
{ F_ATOM_ERROR, "Problem while parsing an atom starting with the letter 'f'" },
{ N_ATOM_ERROR, "Problem while parsing an atom starting with the letter 'n'" },
{ NUMBER_ERROR, "Problem while parsing a number" },
{ UTF8_ERROR, "The input is not valid UTF-8" },
{ UNINITIALIZED, "Uninitialized" },
{ EMPTY, "Empty: no JSON found" },
{ UNESCAPED_CHARS, "Within strings, some characters must be escaped, we found unescaped characters" },
{ UNCLOSED_STRING, "A string is opened, but never closed." },
{ UNSUPPORTED_ARCHITECTURE, "simdjson does not have an implementation supported by this CPU architecture (perhaps it's a non-SIMD CPU?)." },
{ INCORRECT_TYPE, "The JSON element does not have the requested type." },
{ NUMBER_OUT_OF_RANGE, "The JSON number is too large or too small to fit within the requested type." },
{ INDEX_OUT_OF_BOUNDS, "Attempted to access an element of a JSON array that is beyond its length." },
{ NO_SUCH_FIELD, "The JSON field referenced does not exist in this object." },
{ IO_ERROR, "Error reading the file." },
{ INVALID_JSON_POINTER, "Invalid JSON pointer syntax." },
{ INVALID_URI_FRAGMENT, "Invalid URI fragment syntax." },
{ UNEXPECTED_ERROR, "Unexpected error, consider reporting this problem as you may have found a bug in simdjson" }
}; // error_messages[]
} // namespace internal
} // namespace simdjson
/* end file src/error.cpp */
/* begin file src/implementation.cpp */
/* begin file src/isadetection.h */
/* From
https://github.com/endorno/pytorch/blob/master/torch/lib/TH/generic/simd/simd.h
Highly modified.
Copyright (c) 2016- Facebook, Inc (Adam Paszke)
Copyright (c) 2014- Facebook, Inc (Soumith Chintala)
Copyright (c) 2011-2014 Idiap Research Institute (Ronan Collobert)
Copyright (c) 2012-2014 Deepmind Technologies (Koray Kavukcuoglu)
Copyright (c) 2011-2012 NEC Laboratories America (Koray Kavukcuoglu)
Copyright (c) 2011-2013 NYU (Clement Farabet)
Copyright (c) 2006-2010 NEC Laboratories America (Ronan Collobert, Leon Bottou,
Iain Melvin, Jason Weston) Copyright (c) 2006 Idiap Research Institute
(Samy Bengio) Copyright (c) 2001-2004 Idiap Research Institute (Ronan Collobert,
Samy Bengio, Johnny Mariethoz)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the names of Facebook, Deepmind Technologies, NYU, NEC Laboratories
America and IDIAP Research Institute nor the names of its contributors may be
used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SIMDJSON_ISADETECTION_H
#define SIMDJSON_ISADETECTION_H
#include <stdint.h>
#include <stdlib.h>
#if defined(_MSC_VER)
#include <intrin.h>
#elif defined(HAVE_GCC_GET_CPUID) && defined(USE_GCC_GET_CPUID)
#include <cpuid.h>
#endif
namespace simdjson {
enum instruction_set {
DEFAULT = 0x0,
NEON = 0x1,
AVX2 = 0x4,
SSE42 = 0x8,
PCLMULQDQ = 0x10,
BMI1 = 0x20,
BMI2 = 0x40
};
#if defined(__arm__) || defined(__aarch64__) // incl. armel, armhf, arm64
#if defined(__ARM_NEON)
static inline uint32_t detect_supported_architectures() {
return instruction_set::NEON;
}
#else // ARM without NEON
static inline uint32_t detect_supported_architectures() {
return instruction_set::DEFAULT;
}
#endif
#elif defined(__x86_64__) || defined(_M_AMD64) // x64
namespace {
// Can be found on Intel ISA Reference for CPUID
constexpr uint32_t cpuid_avx2_bit = 1 << 5; ///< @private Bit 5 of EBX for EAX=0x7
constexpr uint32_t cpuid_bmi1_bit = 1 << 3; ///< @private bit 3 of EBX for EAX=0x7
constexpr uint32_t cpuid_bmi2_bit = 1 << 8; ///< @private bit 8 of EBX for EAX=0x7
constexpr uint32_t cpuid_sse42_bit = 1 << 20; ///< @private bit 20 of ECX for EAX=0x1
constexpr uint32_t cpuid_pclmulqdq_bit = 1 << 1; ///< @private bit 1 of ECX for EAX=0x1
}
static inline void cpuid(uint32_t *eax, uint32_t *ebx, uint32_t *ecx,
uint32_t *edx) {
#if defined(_MSC_VER)
int cpu_info[4];
__cpuid(cpu_info, *eax);
*eax = cpu_info[0];
*ebx = cpu_info[1];
*ecx = cpu_info[2];
*edx = cpu_info[3];
#elif defined(HAVE_GCC_GET_CPUID) && defined(USE_GCC_GET_CPUID)
uint32_t level = *eax;
__get_cpuid(level, eax, ebx, ecx, edx);
#else
uint32_t a = *eax, b, c = *ecx, d;
asm volatile("cpuid\n\t" : "+a"(a), "=b"(b), "+c"(c), "=d"(d));
*eax = a;
*ebx = b;
*ecx = c;
*edx = d;
#endif
}
static inline uint32_t detect_supported_architectures() {
uint32_t eax, ebx, ecx, edx;
uint32_t host_isa = 0x0;
// ECX for EAX=0x7
eax = 0x7;
ecx = 0x0;
cpuid(&eax, &ebx, &ecx, &edx);
if (ebx & cpuid_avx2_bit) {
host_isa |= instruction_set::AVX2;
}
if (ebx & cpuid_bmi1_bit) {
host_isa |= instruction_set::BMI1;
}
if (ebx & cpuid_bmi2_bit) {
host_isa |= instruction_set::BMI2;
}
// EBX for EAX=0x1
eax = 0x1;
cpuid(&eax, &ebx, &ecx, &edx);
if (ecx & cpuid_sse42_bit) {
host_isa |= instruction_set::SSE42;
}
if (ecx & cpuid_pclmulqdq_bit) {
host_isa |= instruction_set::PCLMULQDQ;
}
return host_isa;
}
#else // fallback
static inline uint32_t detect_supported_architectures() {
return instruction_set::DEFAULT;
}
#endif // end SIMD extension detection code
} // namespace simdjson
#endif // SIMDJSON_ISADETECTION_H
/* end file src/isadetection.h */
/* begin file src/simdprune_tables.h */
#ifndef SIMDJSON_SIMDPRUNE_TABLES_H
#define SIMDJSON_SIMDPRUNE_TABLES_H
#if SIMDJSON_IMPLEMENTATION_ARM64 || SIMDJSON_IMPLEMENTATION_HASWELL || SIMDJSON_IMPLEMENTATION_WESTMERE
#include <cstdint>
namespace simdjson { // table modified and copied from
// http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetTable
static const unsigned char BitsSetTable256mul2[256] = {
0, 2, 2, 4, 2, 4, 4, 6, 2, 4, 4, 6, 4, 6, 6, 8, 2, 4, 4,
6, 4, 6, 6, 8, 4, 6, 6, 8, 6, 8, 8, 10, 2, 4, 4, 6, 4, 6,
6, 8, 4, 6, 6, 8, 6, 8, 8, 10, 4, 6, 6, 8, 6, 8, 8, 10, 6,
8, 8, 10, 8, 10, 10, 12, 2, 4, 4, 6, 4, 6, 6, 8, 4, 6, 6, 8,
6, 8, 8, 10, 4, 6, 6, 8, 6, 8, 8, 10, 6, 8, 8, 10, 8, 10, 10,
12, 4, 6, 6, 8, 6, 8, 8, 10, 6, 8, 8, 10, 8, 10, 10, 12, 6, 8,
8, 10, 8, 10, 10, 12, 8, 10, 10, 12, 10, 12, 12, 14, 2, 4, 4, 6, 4,
6, 6, 8, 4, 6, 6, 8, 6, 8, 8, 10, 4, 6, 6, 8, 6, 8, 8, 10,
6, 8, 8, 10, 8, 10, 10, 12, 4, 6, 6, 8, 6, 8, 8, 10, 6, 8, 8,
10, 8, 10, 10, 12, 6, 8, 8, 10, 8, 10, 10, 12, 8, 10, 10, 12, 10, 12,
12, 14, 4, 6, 6, 8, 6, 8, 8, 10, 6, 8, 8, 10, 8, 10, 10, 12, 6,
8, 8, 10, 8, 10, 10, 12, 8, 10, 10, 12, 10, 12, 12, 14, 6, 8, 8, 10,
8, 10, 10, 12, 8, 10, 10, 12, 10, 12, 12, 14, 8, 10, 10, 12, 10, 12, 12,
14, 10, 12, 12, 14, 12, 14, 14, 16};
static const uint8_t pshufb_combine_table[272] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08,
0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x80, 0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x80, 0x80,
0x00, 0x01, 0x02, 0x03, 0x04, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x80, 0x80, 0x80, 0x00, 0x01, 0x02, 0x03, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f, 0x80, 0x80, 0x80, 0x80, 0x00, 0x01, 0x02, 0x08,
0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x80, 0x80, 0x80, 0x80, 0x80,
0x00, 0x01, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80, 0x00, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
};
// 256 * 8 bytes = 2kB, easily fits in cache.
static const uint64_t thintable_epi8[256] = {
0x0706050403020100, 0x0007060504030201, 0x0007060504030200,
0x0000070605040302, 0x0007060504030100, 0x0000070605040301,
0x0000070605040300, 0x0000000706050403, 0x0007060504020100,
0x0000070605040201, 0x0000070605040200, 0x0000000706050402,
0x0000070605040100, 0x0000000706050401, 0x0000000706050400,
0x0000000007060504, 0x0007060503020100, 0x0000070605030201,
0x0000070605030200, 0x0000000706050302, 0x0000070605030100,
0x0000000706050301, 0x0000000706050300, 0x0000000007060503,
0x0000070605020100, 0x0000000706050201, 0x0000000706050200,
0x0000000007060502, 0x0000000706050100, 0x0000000007060501,
0x0000000007060500, 0x0000000000070605, 0x0007060403020100,
0x0000070604030201, 0x0000070604030200, 0x0000000706040302,
0x0000070604030100, 0x0000000706040301, 0x0000000706040300,
0x0000000007060403, 0x0000070604020100, 0x0000000706040201,
0x0000000706040200, 0x0000000007060402, 0x0000000706040100,
0x0000000007060401, 0x0000000007060400, 0x0000000000070604,
0x0000070603020100, 0x0000000706030201, 0x0000000706030200,
0x0000000007060302, 0x0000000706030100, 0x0000000007060301,
0x0000000007060300, 0x0000000000070603, 0x0000000706020100,
0x0000000007060201, 0x0000000007060200, 0x0000000000070602,
0x0000000007060100, 0x0000000000070601, 0x0000000000070600,
0x0000000000000706, 0x0007050403020100, 0x0000070504030201,
0x0000070504030200, 0x0000000705040302, 0x0000070504030100,
0x0000000705040301, 0x0000000705040300, 0x0000000007050403,
0x0000070504020100, 0x0000000705040201, 0x0000000705040200,
0x0000000007050402, 0x0000000705040100, 0x0000000007050401,
0x0000000007050400, 0x0000000000070504, 0x0000070503020100,
0x0000000705030201, 0x0000000705030200, 0x0000000007050302,
0x0000000705030100, 0x0000000007050301, 0x0000000007050300,
0x0000000000070503, 0x0000000705020100, 0x0000000007050201,
0x0000000007050200, 0x0000000000070502, 0x0000000007050100,
0x0000000000070501, 0x0000000000070500, 0x0000000000000705,
0x0000070403020100, 0x0000000704030201, 0x0000000704030200,
0x0000000007040302, 0x0000000704030100, 0x0000000007040301,
0x0000000007040300, 0x0000000000070403, 0x0000000704020100,
0x0000000007040201, 0x0000000007040200, 0x0000000000070402,
0x0000000007040100, 0x0000000000070401, 0x0000000000070400,
0x0000000000000704, 0x0000000703020100, 0x0000000007030201,
0x0000000007030200, 0x0000000000070302, 0x0000000007030100,
0x0000000000070301, 0x0000000000070300, 0x0000000000000703,
0x0000000007020100, 0x0000000000070201, 0x0000000000070200,
0x0000000000000702, 0x0000000000070100, 0x0000000000000701,
0x0000000000000700, 0x0000000000000007, 0x0006050403020100,
0x0000060504030201, 0x0000060504030200, 0x0000000605040302,
0x0000060504030100, 0x0000000605040301, 0x0000000605040300,
0x0000000006050403, 0x0000060504020100, 0x0000000605040201,
0x0000000605040200, 0x0000000006050402, 0x0000000605040100,
0x0000000006050401, 0x0000000006050400, 0x0000000000060504,
0x0000060503020100, 0x0000000605030201, 0x0000000605030200,
0x0000000006050302, 0x0000000605030100, 0x0000000006050301,
0x0000000006050300, 0x0000000000060503, 0x0000000605020100,
0x0000000006050201, 0x0000000006050200, 0x0000000000060502,
0x0000000006050100, 0x0000000000060501, 0x0000000000060500,
0x0000000000000605, 0x0000060403020100, 0x0000000604030201,
0x0000000604030200, 0x0000000006040302, 0x0000000604030100,
0x0000000006040301, 0x0000000006040300, 0x0000000000060403,
0x0000000604020100, 0x0000000006040201, 0x0000000006040200,
0x0000000000060402, 0x0000000006040100, 0x0000000000060401,
0x0000000000060400, 0x0000000000000604, 0x0000000603020100,
0x0000000006030201, 0x0000000006030200, 0x0000000000060302,
0x0000000006030100, 0x0000000000060301, 0x0000000000060300,
0x0000000000000603, 0x0000000006020100, 0x0000000000060201,
0x0000000000060200, 0x0000000000000602, 0x0000000000060100,
0x0000000000000601, 0x0000000000000600, 0x0000000000000006,
0x0000050403020100, 0x0000000504030201, 0x0000000504030200,
0x0000000005040302, 0x0000000504030100, 0x0000000005040301,
0x0000000005040300, 0x0000000000050403, 0x0000000504020100,
0x0000000005040201, 0x0000000005040200, 0x0000000000050402,
0x0000000005040100, 0x0000000000050401, 0x0000000000050400,
0x0000000000000504, 0x0000000503020100, 0x0000000005030201,
0x0000000005030200, 0x0000000000050302, 0x0000000005030100,
0x0000000000050301, 0x0000000000050300, 0x0000000000000503,
0x0000000005020100, 0x0000000000050201, 0x0000000000050200,
0x0000000000000502, 0x0000000000050100, 0x0000000000000501,
0x0000000000000500, 0x0000000000000005, 0x0000000403020100,
0x0000000004030201, 0x0000000004030200, 0x0000000000040302,
0x0000000004030100, 0x0000000000040301, 0x0000000000040300,
0x0000000000000403, 0x0000000004020100, 0x0000000000040201,
0x0000000000040200, 0x0000000000000402, 0x0000000000040100,
0x0000000000000401, 0x0000000000000400, 0x0000000000000004,
0x0000000003020100, 0x0000000000030201, 0x0000000000030200,
0x0000000000000302, 0x0000000000030100, 0x0000000000000301,
0x0000000000000300, 0x0000000000000003, 0x0000000000020100,
0x0000000000000201, 0x0000000000000200, 0x0000000000000002,
0x0000000000000100, 0x0000000000000001, 0x0000000000000000,
0x0000000000000000,
}; //static uint64_t thintable_epi8[256]
} // namespace simdjson
#endif // SIMDJSON_IMPLEMENTATION_ARM64 || SIMDJSON_IMPLEMENTATION_HASWELL || SIMDJSON_IMPLEMENTATION_WESTMERE
#endif // SIMDJSON_SIMDPRUNE_TABLES_H
/* end file src/simdprune_tables.h */
#include <initializer_list>
// Static array of known implementations. We're hoping these get baked into the executable
// without requiring a static initializer.
#if SIMDJSON_IMPLEMENTATION_HASWELL
/* begin file src/haswell/implementation.h */
#ifndef SIMDJSON_HASWELL_IMPLEMENTATION_H
#define SIMDJSON_HASWELL_IMPLEMENTATION_H
/* isadetection.h already included: #include "isadetection.h" */
namespace simdjson {
namespace haswell {
class implementation final : public simdjson::implementation {
public:
really_inline implementation() : simdjson::implementation(
"haswell",
"Intel/AMD AVX2",
instruction_set::AVX2 | instruction_set::PCLMULQDQ | instruction_set::BMI1 | instruction_set::BMI2
) {}
WARN_UNUSED error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
WARN_UNUSED error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
WARN_UNUSED bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_IMPLEMENTATION_H
/* end file src/haswell/implementation.h */
namespace simdjson { namespace internal { const haswell::implementation haswell_singleton{}; } }
#endif // SIMDJSON_IMPLEMENTATION_HASWELL
#if SIMDJSON_IMPLEMENTATION_WESTMERE
/* begin file src/westmere/implementation.h */
#ifndef SIMDJSON_WESTMERE_IMPLEMENTATION_H
#define SIMDJSON_WESTMERE_IMPLEMENTATION_H
/* isadetection.h already included: #include "isadetection.h" */
namespace simdjson {
namespace westmere {
using namespace simdjson::dom;
class implementation final : public simdjson::implementation {
public:
really_inline implementation() : simdjson::implementation("westmere", "Intel/AMD SSE4.2", instruction_set::SSE42 | instruction_set::PCLMULQDQ) {}
WARN_UNUSED error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
WARN_UNUSED error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
WARN_UNUSED bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_IMPLEMENTATION_H
/* end file src/westmere/implementation.h */
namespace simdjson { namespace internal { const westmere::implementation westmere_singleton{}; } }
#endif // SIMDJSON_IMPLEMENTATION_WESTMERE
#if SIMDJSON_IMPLEMENTATION_ARM64
/* begin file src/arm64/implementation.h */
#ifndef SIMDJSON_ARM64_IMPLEMENTATION_H
#define SIMDJSON_ARM64_IMPLEMENTATION_H
/* isadetection.h already included: #include "isadetection.h" */
namespace simdjson {
namespace arm64 {
using namespace simdjson::dom;
class implementation final : public simdjson::implementation {
public:
really_inline implementation() : simdjson::implementation("arm64", "ARM NEON", instruction_set::NEON) {}
WARN_UNUSED error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
WARN_UNUSED error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
WARN_UNUSED bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_IMPLEMENTATION_H
/* end file src/arm64/implementation.h */
namespace simdjson { namespace internal { const arm64::implementation arm64_singleton{}; } }
#endif // SIMDJSON_IMPLEMENTATION_ARM64
#if SIMDJSON_IMPLEMENTATION_FALLBACK
/* begin file src/fallback/implementation.h */
#ifndef SIMDJSON_FALLBACK_IMPLEMENTATION_H
#define SIMDJSON_FALLBACK_IMPLEMENTATION_H
/* isadetection.h already included: #include "isadetection.h" */
namespace simdjson {
namespace fallback {
using namespace simdjson::dom;
class implementation final : public simdjson::implementation {
public:
really_inline implementation() : simdjson::implementation(
"fallback",
"Generic fallback implementation",
0
) {}
WARN_UNUSED error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
WARN_UNUSED error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
WARN_UNUSED bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_IMPLEMENTATION_H
/* end file src/fallback/implementation.h */
namespace simdjson { namespace internal { const fallback::implementation fallback_singleton{}; } }
#endif // SIMDJSON_IMPLEMENTATION_FALLBACK
namespace simdjson {
namespace internal {
/**
* @private Detects best supported implementation on first use, and sets it
*/
class detect_best_supported_implementation_on_first_use final : public implementation {
public:
const std::string &name() const noexcept final { return set_best()->name(); }
const std::string &description() const noexcept final { return set_best()->description(); }
uint32_t required_instruction_sets() const noexcept final { return set_best()->required_instruction_sets(); }
WARN_UNUSED error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final {
return set_best()->create_dom_parser_implementation(capacity, max_length, dst);
}
WARN_UNUSED error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final {
return set_best()->minify(buf, len, dst, dst_len);
}
WARN_UNUSED bool validate_utf8(const char * buf, size_t len) const noexcept final override {
return set_best()->validate_utf8(buf, len);
}
really_inline detect_best_supported_implementation_on_first_use() noexcept : implementation("best_supported_detector", "Detects the best supported implementation and sets it", 0) {}
private:
const implementation *set_best() const noexcept;
};
const detect_best_supported_implementation_on_first_use detect_best_supported_implementation_on_first_use_singleton;
internal::atomic_ptr<const implementation> active_implementation{&internal::detect_best_supported_implementation_on_first_use_singleton};
const std::initializer_list<const implementation *> available_implementation_pointers {
#if SIMDJSON_IMPLEMENTATION_HASWELL
&haswell_singleton,
#endif
#if SIMDJSON_IMPLEMENTATION_WESTMERE
&westmere_singleton,
#endif
#if SIMDJSON_IMPLEMENTATION_ARM64
&arm64_singleton,
#endif
#if SIMDJSON_IMPLEMENTATION_FALLBACK
&fallback_singleton,
#endif
}; // available_implementation_pointers
// So we can return UNSUPPORTED_ARCHITECTURE from the parser when there is no support
class unsupported_implementation final : public implementation {
public:
WARN_UNUSED error_code create_dom_parser_implementation(
size_t,
size_t,
std::unique_ptr<internal::dom_parser_implementation>&
) const noexcept final {
return UNSUPPORTED_ARCHITECTURE;
}
WARN_UNUSED error_code minify(const uint8_t *, size_t, uint8_t *, size_t &) const noexcept final override {
return UNSUPPORTED_ARCHITECTURE;
}
WARN_UNUSED bool validate_utf8(const char *, size_t) const noexcept final override {
return false; // Just refuse to validate. Given that we have a fallback implementation
// it seems unlikely that unsupported_implementation will ever be used. If it is used,
// then it will flag all strings as invalid. The alternative is to return an error_code
// from which the user has to figure out whether the string is valid UTF-8... which seems
// like a lot of work just to handle the very unlikely case that we have an unsupported
// implementation. And, when it does happen (that we have an unsupported implementation),
// what are the chances that the programmer has a fallback? Given that *we* provide the
// fallback, it implies that the programmer would need a fallback for our fallback.
}
unsupported_implementation() : implementation("unsupported", "Unsupported CPU (no detected SIMD instructions)", 0) {}
};
const unsupported_implementation unsupported_singleton{};
size_t available_implementation_list::size() const noexcept {
return internal::available_implementation_pointers.size();
}
const implementation * const *available_implementation_list::begin() const noexcept {
return internal::available_implementation_pointers.begin();
}
const implementation * const *available_implementation_list::end() const noexcept {
return internal::available_implementation_pointers.end();
}
const implementation *available_implementation_list::detect_best_supported() const noexcept {
// They are prelisted in priority order, so we just go down the list
uint32_t supported_instruction_sets = detect_supported_architectures();
for (const implementation *impl : internal::available_implementation_pointers) {
uint32_t required_instruction_sets = impl->required_instruction_sets();
if ((supported_instruction_sets & required_instruction_sets) == required_instruction_sets) { return impl; }
}
return &unsupported_singleton; // this should never happen?
}
const implementation *detect_best_supported_implementation_on_first_use::set_best() const noexcept {
SIMDJSON_PUSH_DISABLE_WARNINGS
SIMDJSON_DISABLE_DEPRECATED_WARNING // Disable CRT_SECURE warning on MSVC: manually verified this is safe
char *force_implementation_name = getenv("SIMDJSON_FORCE_IMPLEMENTATION");
SIMDJSON_POP_DISABLE_WARNINGS
if (force_implementation_name) {
auto force_implementation = available_implementations[force_implementation_name];
if (force_implementation) {
return active_implementation = force_implementation;
} else {
// Note: abort() and stderr usage within the library is forbidden.
return active_implementation = &unsupported_singleton;
}
}
return active_implementation = available_implementations.detect_best_supported();
}
} // namespace internal
SIMDJSON_DLLIMPORTEXPORT const internal::available_implementation_list available_implementations{};
SIMDJSON_DLLIMPORTEXPORT internal::atomic_ptr<const implementation> active_implementation{&internal::detect_best_supported_implementation_on_first_use_singleton};
WARN_UNUSED error_code minify(const char *buf, size_t len, char *dst, size_t &dst_len) noexcept {
return active_implementation->minify((const uint8_t *)buf, len, (uint8_t *)dst, dst_len);
}
WARN_UNUSED bool validate_utf8(const char *buf, size_t len) noexcept {
return active_implementation->validate_utf8(buf, len);
}
} // namespace simdjson
/* end file src/fallback/implementation.h */
// Anything in the top level directory MUST be included outside of the #if statements
// below, or amalgamation will screw them up!
/* isadetection.h already included: #include "isadetection.h" */
/* begin file src/jsoncharutils.h */
#ifndef SIMDJSON_JSONCHARUTILS_H
#define SIMDJSON_JSONCHARUTILS_H
#ifdef JSON_TEST_STRINGS
void found_string(const uint8_t *buf, const uint8_t *parsed_begin,
const uint8_t *parsed_end);
void found_bad_string(const uint8_t *buf);
#endif
namespace simdjson {
// structural chars here are
// they are { 0x7b } 0x7d : 0x3a [ 0x5b ] 0x5d , 0x2c (and NULL)
// we are also interested in the four whitespace characters
// space 0x20, linefeed 0x0a, horizontal tab 0x09 and carriage return 0x0d
// these are the chars that can follow a true/false/null or number atom
// and nothing else
const uint32_t structural_or_whitespace_or_null_negated[256] = {
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
// return non-zero if not a structural or whitespace char
// zero otherwise
really_inline uint32_t is_not_structural_or_whitespace_or_null(uint8_t c) {
return structural_or_whitespace_or_null_negated[c];
}
const uint32_t structural_or_whitespace_negated[256] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
// return non-zero if not a structural or whitespace char
// zero otherwise
really_inline uint32_t is_not_structural_or_whitespace(uint8_t c) {
return structural_or_whitespace_negated[c];
}
const uint32_t structural_or_whitespace_or_null[256] = {
1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
really_inline uint32_t is_structural_or_whitespace_or_null(uint8_t c) {
return structural_or_whitespace_or_null[c];
}
const uint32_t structural_or_whitespace[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
really_inline uint32_t is_structural_or_whitespace(uint8_t c) {
return structural_or_whitespace[c];
}
const uint32_t digit_to_val32[886] = {
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x0, 0x1, 0x2, 0x3, 0x4, 0x5,
0x6, 0x7, 0x8, 0x9, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xa,
0xb, 0xc, 0xd, 0xe, 0xf, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xa, 0xb, 0xc, 0xd, 0xe,
0xf, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x0, 0x10, 0x20, 0x30, 0x40, 0x50,
0x60, 0x70, 0x80, 0x90, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xa0,
0xb0, 0xc0, 0xd0, 0xe0, 0xf0, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xa0, 0xb0, 0xc0, 0xd0, 0xe0,
0xf0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x0, 0x100, 0x200, 0x300, 0x400, 0x500,
0x600, 0x700, 0x800, 0x900, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xa00,
0xb00, 0xc00, 0xd00, 0xe00, 0xf00, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xa00, 0xb00, 0xc00, 0xd00, 0xe00,
0xf00, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x0, 0x1000, 0x2000, 0x3000, 0x4000, 0x5000,
0x6000, 0x7000, 0x8000, 0x9000, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xa000,
0xb000, 0xc000, 0xd000, 0xe000, 0xf000, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xa000, 0xb000, 0xc000, 0xd000, 0xe000,
0xf000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF};
// returns a value with the high 16 bits set if not valid
// otherwise returns the conversion of the 4 hex digits at src into the bottom
// 16 bits of the 32-bit return register
//
// see
// https://lemire.me/blog/2019/04/17/parsing-short-hexadecimal-strings-efficiently/
static inline uint32_t hex_to_u32_nocheck(
const uint8_t *src) { // strictly speaking, static inline is a C-ism
uint32_t v1 = digit_to_val32[630 + src[0]];
uint32_t v2 = digit_to_val32[420 + src[1]];
uint32_t v3 = digit_to_val32[210 + src[2]];
uint32_t v4 = digit_to_val32[0 + src[3]];
return v1 | v2 | v3 | v4;
}
// given a code point cp, writes to c
// the utf-8 code, outputting the length in
// bytes, if the length is zero, the code point
// is invalid
//
// This can possibly be made faster using pdep
// and clz and table lookups, but JSON documents
// have few escaped code points, and the following
// function looks cheap.
//
// Note: we assume that surrogates are treated separately
//
inline size_t codepoint_to_utf8(uint32_t cp, uint8_t *c) {
if (cp <= 0x7F) {
c[0] = uint8_t(cp);
return 1; // ascii
}
if (cp <= 0x7FF) {
c[0] = uint8_t((cp >> 6) + 192);
c[1] = uint8_t((cp & 63) + 128);
return 2; // universal plane
// Surrogates are treated elsewhere...
//} //else if (0xd800 <= cp && cp <= 0xdfff) {
// return 0; // surrogates // could put assert here
} else if (cp <= 0xFFFF) {
c[0] = uint8_t((cp >> 12) + 224);
c[1] = uint8_t(((cp >> 6) & 63) + 128);
c[2] = uint8_t((cp & 63) + 128);
return 3;
} else if (cp <= 0x10FFFF) { // if you know you have a valid code point, this
// is not needed
c[0] = uint8_t((cp >> 18) + 240);
c[1] = uint8_t(((cp >> 12) & 63) + 128);
c[2] = uint8_t(((cp >> 6) & 63) + 128);
c[3] = uint8_t((cp & 63) + 128);
return 4;
}
// will return 0 when the code point was too large.
return 0; // bad r
}
////
// The following code is used in number parsing. It is not
// properly "char utils" stuff, but we move it here so that
// it does not get copied multiple times in the binaries (once
// per instruction set).
///
constexpr int FASTFLOAT_SMALLEST_POWER = -325;
constexpr int FASTFLOAT_LARGEST_POWER = 308;
struct value128 {
uint64_t low;
uint64_t high;
};
#ifdef SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
really_inline value128 full_multiplication(uint64_t value1, uint64_t value2) {
value128 answer;
#if defined(SIMDJSON_REGULAR_VISUAL_STUDIO) || defined(SIMDJSON_IS_32BITS)
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // defined(SIMDJSON_REGULAR_VISUAL_STUDIO) || defined(SIMDJSON_IS_32BITS)
__uint128_t r = ((__uint128_t)value1) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
// Precomputed powers of ten from 10^0 to 10^22. These
// can be represented exactly using the double type.
static const double power_of_ten[] = {
1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11,
1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22};
// the mantissas of powers of ten from -308 to 308, extended out to sixty four
// bits
// This struct will likely get padded to 16 bytes.
typedef struct {
uint64_t mantissa;
int32_t exp;
} components;
// The array power_of_ten_components contain the powers of ten approximated
// as a 64-bit mantissa, with an exponent part. It goes from 10^
// FASTFLOAT_SMALLEST_POWER to
// 10^FASTFLOAT_LARGEST_POWER (inclusively). The mantissa is truncated, and
// never rounded up.
// Uses about 10KB.
static const components power_of_ten_components[] = {
{0xa5ced43b7e3e9188L, 7}, {0xcf42894a5dce35eaL, 10},
{0x818995ce7aa0e1b2L, 14}, {0xa1ebfb4219491a1fL, 17},
{0xca66fa129f9b60a6L, 20}, {0xfd00b897478238d0L, 23},
{0x9e20735e8cb16382L, 27}, {0xc5a890362fddbc62L, 30},
{0xf712b443bbd52b7bL, 33}, {0x9a6bb0aa55653b2dL, 37},
{0xc1069cd4eabe89f8L, 40}, {0xf148440a256e2c76L, 43},
{0x96cd2a865764dbcaL, 47}, {0xbc807527ed3e12bcL, 50},
{0xeba09271e88d976bL, 53}, {0x93445b8731587ea3L, 57},
{0xb8157268fdae9e4cL, 60}, {0xe61acf033d1a45dfL, 63},
{0x8fd0c16206306babL, 67}, {0xb3c4f1ba87bc8696L, 70},
{0xe0b62e2929aba83cL, 73}, {0x8c71dcd9ba0b4925L, 77},
{0xaf8e5410288e1b6fL, 80}, {0xdb71e91432b1a24aL, 83},
{0x892731ac9faf056eL, 87}, {0xab70fe17c79ac6caL, 90},
{0xd64d3d9db981787dL, 93}, {0x85f0468293f0eb4eL, 97},
{0xa76c582338ed2621L, 100}, {0xd1476e2c07286faaL, 103},
{0x82cca4db847945caL, 107}, {0xa37fce126597973cL, 110},
{0xcc5fc196fefd7d0cL, 113}, {0xff77b1fcbebcdc4fL, 116},
{0x9faacf3df73609b1L, 120}, {0xc795830d75038c1dL, 123},
{0xf97ae3d0d2446f25L, 126}, {0x9becce62836ac577L, 130},
{0xc2e801fb244576d5L, 133}, {0xf3a20279ed56d48aL, 136},
{0x9845418c345644d6L, 140}, {0xbe5691ef416bd60cL, 143},
{0xedec366b11c6cb8fL, 146}, {0x94b3a202eb1c3f39L, 150},
{0xb9e08a83a5e34f07L, 153}, {0xe858ad248f5c22c9L, 156},
{0x91376c36d99995beL, 160}, {0xb58547448ffffb2dL, 163},
{0xe2e69915b3fff9f9L, 166}, {0x8dd01fad907ffc3bL, 170},
{0xb1442798f49ffb4aL, 173}, {0xdd95317f31c7fa1dL, 176},
{0x8a7d3eef7f1cfc52L, 180}, {0xad1c8eab5ee43b66L, 183},
{0xd863b256369d4a40L, 186}, {0x873e4f75e2224e68L, 190},
{0xa90de3535aaae202L, 193}, {0xd3515c2831559a83L, 196},
{0x8412d9991ed58091L, 200}, {0xa5178fff668ae0b6L, 203},
{0xce5d73ff402d98e3L, 206}, {0x80fa687f881c7f8eL, 210},
{0xa139029f6a239f72L, 213}, {0xc987434744ac874eL, 216},
{0xfbe9141915d7a922L, 219}, {0x9d71ac8fada6c9b5L, 223},
{0xc4ce17b399107c22L, 226}, {0xf6019da07f549b2bL, 229},
{0x99c102844f94e0fbL, 233}, {0xc0314325637a1939L, 236},
{0xf03d93eebc589f88L, 239}, {0x96267c7535b763b5L, 243},
{0xbbb01b9283253ca2L, 246}, {0xea9c227723ee8bcbL, 249},
{0x92a1958a7675175fL, 253}, {0xb749faed14125d36L, 256},
{0xe51c79a85916f484L, 259}, {0x8f31cc0937ae58d2L, 263},
{0xb2fe3f0b8599ef07L, 266}, {0xdfbdcece67006ac9L, 269},
{0x8bd6a141006042bdL, 273}, {0xaecc49914078536dL, 276},
{0xda7f5bf590966848L, 279}, {0x888f99797a5e012dL, 283},
{0xaab37fd7d8f58178L, 286}, {0xd5605fcdcf32e1d6L, 289},
{0x855c3be0a17fcd26L, 293}, {0xa6b34ad8c9dfc06fL, 296},
{0xd0601d8efc57b08bL, 299}, {0x823c12795db6ce57L, 303},
{0xa2cb1717b52481edL, 306}, {0xcb7ddcdda26da268L, 309},
{0xfe5d54150b090b02L, 312}, {0x9efa548d26e5a6e1L, 316},
{0xc6b8e9b0709f109aL, 319}, {0xf867241c8cc6d4c0L, 322},
{0x9b407691d7fc44f8L, 326}, {0xc21094364dfb5636L, 329},
{0xf294b943e17a2bc4L, 332}, {0x979cf3ca6cec5b5aL, 336},
{0xbd8430bd08277231L, 339}, {0xece53cec4a314ebdL, 342},
{0x940f4613ae5ed136L, 346}, {0xb913179899f68584L, 349},
{0xe757dd7ec07426e5L, 352}, {0x9096ea6f3848984fL, 356},
{0xb4bca50b065abe63L, 359}, {0xe1ebce4dc7f16dfbL, 362},
{0x8d3360f09cf6e4bdL, 366}, {0xb080392cc4349decL, 369},
{0xdca04777f541c567L, 372}, {0x89e42caaf9491b60L, 376},
{0xac5d37d5b79b6239L, 379}, {0xd77485cb25823ac7L, 382},
{0x86a8d39ef77164bcL, 386}, {0xa8530886b54dbdebL, 389},
{0xd267caa862a12d66L, 392}, {0x8380dea93da4bc60L, 396},
{0xa46116538d0deb78L, 399}, {0xcd795be870516656L, 402},
{0x806bd9714632dff6L, 406}, {0xa086cfcd97bf97f3L, 409},
{0xc8a883c0fdaf7df0L, 412}, {0xfad2a4b13d1b5d6cL, 415},
{0x9cc3a6eec6311a63L, 419}, {0xc3f490aa77bd60fcL, 422},
{0xf4f1b4d515acb93bL, 425}, {0x991711052d8bf3c5L, 429},
{0xbf5cd54678eef0b6L, 432}, {0xef340a98172aace4L, 435},
{0x9580869f0e7aac0eL, 439}, {0xbae0a846d2195712L, 442},
{0xe998d258869facd7L, 445}, {0x91ff83775423cc06L, 449},
{0xb67f6455292cbf08L, 452}, {0xe41f3d6a7377eecaL, 455},
{0x8e938662882af53eL, 459}, {0xb23867fb2a35b28dL, 462},
{0xdec681f9f4c31f31L, 465}, {0x8b3c113c38f9f37eL, 469},
{0xae0b158b4738705eL, 472}, {0xd98ddaee19068c76L, 475},
{0x87f8a8d4cfa417c9L, 479}, {0xa9f6d30a038d1dbcL, 482},
{0xd47487cc8470652bL, 485}, {0x84c8d4dfd2c63f3bL, 489},
{0xa5fb0a17c777cf09L, 492}, {0xcf79cc9db955c2ccL, 495},
{0x81ac1fe293d599bfL, 499}, {0xa21727db38cb002fL, 502},
{0xca9cf1d206fdc03bL, 505}, {0xfd442e4688bd304aL, 508},
{0x9e4a9cec15763e2eL, 512}, {0xc5dd44271ad3cdbaL, 515},
{0xf7549530e188c128L, 518}, {0x9a94dd3e8cf578b9L, 522},
{0xc13a148e3032d6e7L, 525}, {0xf18899b1bc3f8ca1L, 528},
{0x96f5600f15a7b7e5L, 532}, {0xbcb2b812db11a5deL, 535},
{0xebdf661791d60f56L, 538}, {0x936b9fcebb25c995L, 542},
{0xb84687c269ef3bfbL, 545}, {0xe65829b3046b0afaL, 548},
{0x8ff71a0fe2c2e6dcL, 552}, {0xb3f4e093db73a093L, 555},
{0xe0f218b8d25088b8L, 558}, {0x8c974f7383725573L, 562},
{0xafbd2350644eeacfL, 565}, {0xdbac6c247d62a583L, 568},
{0x894bc396ce5da772L, 572}, {0xab9eb47c81f5114fL, 575},
{0xd686619ba27255a2L, 578}, {0x8613fd0145877585L, 582},
{0xa798fc4196e952e7L, 585}, {0xd17f3b51fca3a7a0L, 588},
{0x82ef85133de648c4L, 592}, {0xa3ab66580d5fdaf5L, 595},
{0xcc963fee10b7d1b3L, 598}, {0xffbbcfe994e5c61fL, 601},
{0x9fd561f1fd0f9bd3L, 605}, {0xc7caba6e7c5382c8L, 608},
{0xf9bd690a1b68637bL, 611}, {0x9c1661a651213e2dL, 615},
{0xc31bfa0fe5698db8L, 618}, {0xf3e2f893dec3f126L, 621},
{0x986ddb5c6b3a76b7L, 625}, {0xbe89523386091465L, 628},
{0xee2ba6c0678b597fL, 631}, {0x94db483840b717efL, 635},
{0xba121a4650e4ddebL, 638}, {0xe896a0d7e51e1566L, 641},
{0x915e2486ef32cd60L, 645}, {0xb5b5ada8aaff80b8L, 648},
{0xe3231912d5bf60e6L, 651}, {0x8df5efabc5979c8fL, 655},
{0xb1736b96b6fd83b3L, 658}, {0xddd0467c64bce4a0L, 661},
{0x8aa22c0dbef60ee4L, 665}, {0xad4ab7112eb3929dL, 668},
{0xd89d64d57a607744L, 671}, {0x87625f056c7c4a8bL, 675},
{0xa93af6c6c79b5d2dL, 678}, {0xd389b47879823479L, 681},
{0x843610cb4bf160cbL, 685}, {0xa54394fe1eedb8feL, 688},
{0xce947a3da6a9273eL, 691}, {0x811ccc668829b887L, 695},
{0xa163ff802a3426a8L, 698}, {0xc9bcff6034c13052L, 701},
{0xfc2c3f3841f17c67L, 704}, {0x9d9ba7832936edc0L, 708},
{0xc5029163f384a931L, 711}, {0xf64335bcf065d37dL, 714},
{0x99ea0196163fa42eL, 718}, {0xc06481fb9bcf8d39L, 721},
{0xf07da27a82c37088L, 724}, {0x964e858c91ba2655L, 728},
{0xbbe226efb628afeaL, 731}, {0xeadab0aba3b2dbe5L, 734},
{0x92c8ae6b464fc96fL, 738}, {0xb77ada0617e3bbcbL, 741},
{0xe55990879ddcaabdL, 744}, {0x8f57fa54c2a9eab6L, 748},
{0xb32df8e9f3546564L, 751}, {0xdff9772470297ebdL, 754},
{0x8bfbea76c619ef36L, 758}, {0xaefae51477a06b03L, 761},
{0xdab99e59958885c4L, 764}, {0x88b402f7fd75539bL, 768},
{0xaae103b5fcd2a881L, 771}, {0xd59944a37c0752a2L, 774},
{0x857fcae62d8493a5L, 778}, {0xa6dfbd9fb8e5b88eL, 781},
{0xd097ad07a71f26b2L, 784}, {0x825ecc24c873782fL, 788},
{0xa2f67f2dfa90563bL, 791}, {0xcbb41ef979346bcaL, 794},
{0xfea126b7d78186bcL, 797}, {0x9f24b832e6b0f436L, 801},
{0xc6ede63fa05d3143L, 804}, {0xf8a95fcf88747d94L, 807},
{0x9b69dbe1b548ce7cL, 811}, {0xc24452da229b021bL, 814},
{0xf2d56790ab41c2a2L, 817}, {0x97c560ba6b0919a5L, 821},
{0xbdb6b8e905cb600fL, 824}, {0xed246723473e3813L, 827},
{0x9436c0760c86e30bL, 831}, {0xb94470938fa89bceL, 834},
{0xe7958cb87392c2c2L, 837}, {0x90bd77f3483bb9b9L, 841},
{0xb4ecd5f01a4aa828L, 844}, {0xe2280b6c20dd5232L, 847},
{0x8d590723948a535fL, 851}, {0xb0af48ec79ace837L, 854},
{0xdcdb1b2798182244L, 857}, {0x8a08f0f8bf0f156bL, 861},
{0xac8b2d36eed2dac5L, 864}, {0xd7adf884aa879177L, 867},
{0x86ccbb52ea94baeaL, 871}, {0xa87fea27a539e9a5L, 874},
{0xd29fe4b18e88640eL, 877}, {0x83a3eeeef9153e89L, 881},
{0xa48ceaaab75a8e2bL, 884}, {0xcdb02555653131b6L, 887},
{0x808e17555f3ebf11L, 891}, {0xa0b19d2ab70e6ed6L, 894},
{0xc8de047564d20a8bL, 897}, {0xfb158592be068d2eL, 900},
{0x9ced737bb6c4183dL, 904}, {0xc428d05aa4751e4cL, 907},
{0xf53304714d9265dfL, 910}, {0x993fe2c6d07b7fabL, 914},
{0xbf8fdb78849a5f96L, 917}, {0xef73d256a5c0f77cL, 920},
{0x95a8637627989aadL, 924}, {0xbb127c53b17ec159L, 927},
{0xe9d71b689dde71afL, 930}, {0x9226712162ab070dL, 934},
{0xb6b00d69bb55c8d1L, 937}, {0xe45c10c42a2b3b05L, 940},
{0x8eb98a7a9a5b04e3L, 944}, {0xb267ed1940f1c61cL, 947},
{0xdf01e85f912e37a3L, 950}, {0x8b61313bbabce2c6L, 954},
{0xae397d8aa96c1b77L, 957}, {0xd9c7dced53c72255L, 960},
{0x881cea14545c7575L, 964}, {0xaa242499697392d2L, 967},
{0xd4ad2dbfc3d07787L, 970}, {0x84ec3c97da624ab4L, 974},
{0xa6274bbdd0fadd61L, 977}, {0xcfb11ead453994baL, 980},
{0x81ceb32c4b43fcf4L, 984}, {0xa2425ff75e14fc31L, 987},
{0xcad2f7f5359a3b3eL, 990}, {0xfd87b5f28300ca0dL, 993},
{0x9e74d1b791e07e48L, 997}, {0xc612062576589ddaL, 1000},
{0xf79687aed3eec551L, 1003}, {0x9abe14cd44753b52L, 1007},
{0xc16d9a0095928a27L, 1010}, {0xf1c90080baf72cb1L, 1013},
{0x971da05074da7beeL, 1017}, {0xbce5086492111aeaL, 1020},
{0xec1e4a7db69561a5L, 1023}, {0x9392ee8e921d5d07L, 1027},
{0xb877aa3236a4b449L, 1030}, {0xe69594bec44de15bL, 1033},
{0x901d7cf73ab0acd9L, 1037}, {0xb424dc35095cd80fL, 1040},
{0xe12e13424bb40e13L, 1043}, {0x8cbccc096f5088cbL, 1047},
{0xafebff0bcb24aafeL, 1050}, {0xdbe6fecebdedd5beL, 1053},
{0x89705f4136b4a597L, 1057}, {0xabcc77118461cefcL, 1060},
{0xd6bf94d5e57a42bcL, 1063}, {0x8637bd05af6c69b5L, 1067},
{0xa7c5ac471b478423L, 1070}, {0xd1b71758e219652bL, 1073},
{0x83126e978d4fdf3bL, 1077}, {0xa3d70a3d70a3d70aL, 1080},
{0xccccccccccccccccL, 1083}, {0x8000000000000000L, 1087},
{0xa000000000000000L, 1090}, {0xc800000000000000L, 1093},
{0xfa00000000000000L, 1096}, {0x9c40000000000000L, 1100},
{0xc350000000000000L, 1103}, {0xf424000000000000L, 1106},
{0x9896800000000000L, 1110}, {0xbebc200000000000L, 1113},
{0xee6b280000000000L, 1116}, {0x9502f90000000000L, 1120},
{0xba43b74000000000L, 1123}, {0xe8d4a51000000000L, 1126},
{0x9184e72a00000000L, 1130}, {0xb5e620f480000000L, 1133},
{0xe35fa931a0000000L, 1136}, {0x8e1bc9bf04000000L, 1140},
{0xb1a2bc2ec5000000L, 1143}, {0xde0b6b3a76400000L, 1146},
{0x8ac7230489e80000L, 1150}, {0xad78ebc5ac620000L, 1153},
{0xd8d726b7177a8000L, 1156}, {0x878678326eac9000L, 1160},
{0xa968163f0a57b400L, 1163}, {0xd3c21bcecceda100L, 1166},
{0x84595161401484a0L, 1170}, {0xa56fa5b99019a5c8L, 1173},
{0xcecb8f27f4200f3aL, 1176}, {0x813f3978f8940984L, 1180},
{0xa18f07d736b90be5L, 1183}, {0xc9f2c9cd04674edeL, 1186},
{0xfc6f7c4045812296L, 1189}, {0x9dc5ada82b70b59dL, 1193},
{0xc5371912364ce305L, 1196}, {0xf684df56c3e01bc6L, 1199},
{0x9a130b963a6c115cL, 1203}, {0xc097ce7bc90715b3L, 1206},
{0xf0bdc21abb48db20L, 1209}, {0x96769950b50d88f4L, 1213},
{0xbc143fa4e250eb31L, 1216}, {0xeb194f8e1ae525fdL, 1219},
{0x92efd1b8d0cf37beL, 1223}, {0xb7abc627050305adL, 1226},
{0xe596b7b0c643c719L, 1229}, {0x8f7e32ce7bea5c6fL, 1233},
{0xb35dbf821ae4f38bL, 1236}, {0xe0352f62a19e306eL, 1239},
{0x8c213d9da502de45L, 1243}, {0xaf298d050e4395d6L, 1246},
{0xdaf3f04651d47b4cL, 1249}, {0x88d8762bf324cd0fL, 1253},
{0xab0e93b6efee0053L, 1256}, {0xd5d238a4abe98068L, 1259},
{0x85a36366eb71f041L, 1263}, {0xa70c3c40a64e6c51L, 1266},
{0xd0cf4b50cfe20765L, 1269}, {0x82818f1281ed449fL, 1273},
{0xa321f2d7226895c7L, 1276}, {0xcbea6f8ceb02bb39L, 1279},
{0xfee50b7025c36a08L, 1282}, {0x9f4f2726179a2245L, 1286},
{0xc722f0ef9d80aad6L, 1289}, {0xf8ebad2b84e0d58bL, 1292},
{0x9b934c3b330c8577L, 1296}, {0xc2781f49ffcfa6d5L, 1299},
{0xf316271c7fc3908aL, 1302}, {0x97edd871cfda3a56L, 1306},
{0xbde94e8e43d0c8ecL, 1309}, {0xed63a231d4c4fb27L, 1312},
{0x945e455f24fb1cf8L, 1316}, {0xb975d6b6ee39e436L, 1319},
{0xe7d34c64a9c85d44L, 1322}, {0x90e40fbeea1d3a4aL, 1326},
{0xb51d13aea4a488ddL, 1329}, {0xe264589a4dcdab14L, 1332},
{0x8d7eb76070a08aecL, 1336}, {0xb0de65388cc8ada8L, 1339},
{0xdd15fe86affad912L, 1342}, {0x8a2dbf142dfcc7abL, 1346},
{0xacb92ed9397bf996L, 1349}, {0xd7e77a8f87daf7fbL, 1352},
{0x86f0ac99b4e8dafdL, 1356}, {0xa8acd7c0222311bcL, 1359},
{0xd2d80db02aabd62bL, 1362}, {0x83c7088e1aab65dbL, 1366},
{0xa4b8cab1a1563f52L, 1369}, {0xcde6fd5e09abcf26L, 1372},
{0x80b05e5ac60b6178L, 1376}, {0xa0dc75f1778e39d6L, 1379},
{0xc913936dd571c84cL, 1382}, {0xfb5878494ace3a5fL, 1385},
{0x9d174b2dcec0e47bL, 1389}, {0xc45d1df942711d9aL, 1392},
{0xf5746577930d6500L, 1395}, {0x9968bf6abbe85f20L, 1399},
{0xbfc2ef456ae276e8L, 1402}, {0xefb3ab16c59b14a2L, 1405},
{0x95d04aee3b80ece5L, 1409}, {0xbb445da9ca61281fL, 1412},
{0xea1575143cf97226L, 1415}, {0x924d692ca61be758L, 1419},
{0xb6e0c377cfa2e12eL, 1422}, {0xe498f455c38b997aL, 1425},
{0x8edf98b59a373fecL, 1429}, {0xb2977ee300c50fe7L, 1432},
{0xdf3d5e9bc0f653e1L, 1435}, {0x8b865b215899f46cL, 1439},
{0xae67f1e9aec07187L, 1442}, {0xda01ee641a708de9L, 1445},
{0x884134fe908658b2L, 1449}, {0xaa51823e34a7eedeL, 1452},
{0xd4e5e2cdc1d1ea96L, 1455}, {0x850fadc09923329eL, 1459},
{0xa6539930bf6bff45L, 1462}, {0xcfe87f7cef46ff16L, 1465},
{0x81f14fae158c5f6eL, 1469}, {0xa26da3999aef7749L, 1472},
{0xcb090c8001ab551cL, 1475}, {0xfdcb4fa002162a63L, 1478},
{0x9e9f11c4014dda7eL, 1482}, {0xc646d63501a1511dL, 1485},
{0xf7d88bc24209a565L, 1488}, {0x9ae757596946075fL, 1492},
{0xc1a12d2fc3978937L, 1495}, {0xf209787bb47d6b84L, 1498},
{0x9745eb4d50ce6332L, 1502}, {0xbd176620a501fbffL, 1505},
{0xec5d3fa8ce427affL, 1508}, {0x93ba47c980e98cdfL, 1512},
{0xb8a8d9bbe123f017L, 1515}, {0xe6d3102ad96cec1dL, 1518},
{0x9043ea1ac7e41392L, 1522}, {0xb454e4a179dd1877L, 1525},
{0xe16a1dc9d8545e94L, 1528}, {0x8ce2529e2734bb1dL, 1532},
{0xb01ae745b101e9e4L, 1535}, {0xdc21a1171d42645dL, 1538},
{0x899504ae72497ebaL, 1542}, {0xabfa45da0edbde69L, 1545},
{0xd6f8d7509292d603L, 1548}, {0x865b86925b9bc5c2L, 1552},
{0xa7f26836f282b732L, 1555}, {0xd1ef0244af2364ffL, 1558},
{0x8335616aed761f1fL, 1562}, {0xa402b9c5a8d3a6e7L, 1565},
{0xcd036837130890a1L, 1568}, {0x802221226be55a64L, 1572},
{0xa02aa96b06deb0fdL, 1575}, {0xc83553c5c8965d3dL, 1578},
{0xfa42a8b73abbf48cL, 1581}, {0x9c69a97284b578d7L, 1585},
{0xc38413cf25e2d70dL, 1588}, {0xf46518c2ef5b8cd1L, 1591},
{0x98bf2f79d5993802L, 1595}, {0xbeeefb584aff8603L, 1598},
{0xeeaaba2e5dbf6784L, 1601}, {0x952ab45cfa97a0b2L, 1605},
{0xba756174393d88dfL, 1608}, {0xe912b9d1478ceb17L, 1611},
{0x91abb422ccb812eeL, 1615}, {0xb616a12b7fe617aaL, 1618},
{0xe39c49765fdf9d94L, 1621}, {0x8e41ade9fbebc27dL, 1625},
{0xb1d219647ae6b31cL, 1628}, {0xde469fbd99a05fe3L, 1631},
{0x8aec23d680043beeL, 1635}, {0xada72ccc20054ae9L, 1638},
{0xd910f7ff28069da4L, 1641}, {0x87aa9aff79042286L, 1645},
{0xa99541bf57452b28L, 1648}, {0xd3fa922f2d1675f2L, 1651},
{0x847c9b5d7c2e09b7L, 1655}, {0xa59bc234db398c25L, 1658},
{0xcf02b2c21207ef2eL, 1661}, {0x8161afb94b44f57dL, 1665},
{0xa1ba1ba79e1632dcL, 1668}, {0xca28a291859bbf93L, 1671},
{0xfcb2cb35e702af78L, 1674}, {0x9defbf01b061adabL, 1678},
{0xc56baec21c7a1916L, 1681}, {0xf6c69a72a3989f5bL, 1684},
{0x9a3c2087a63f6399L, 1688}, {0xc0cb28a98fcf3c7fL, 1691},
{0xf0fdf2d3f3c30b9fL, 1694}, {0x969eb7c47859e743L, 1698},
{0xbc4665b596706114L, 1701}, {0xeb57ff22fc0c7959L, 1704},
{0x9316ff75dd87cbd8L, 1708}, {0xb7dcbf5354e9beceL, 1711},
{0xe5d3ef282a242e81L, 1714}, {0x8fa475791a569d10L, 1718},
{0xb38d92d760ec4455L, 1721}, {0xe070f78d3927556aL, 1724},
{0x8c469ab843b89562L, 1728}, {0xaf58416654a6babbL, 1731},
{0xdb2e51bfe9d0696aL, 1734}, {0x88fcf317f22241e2L, 1738},
{0xab3c2fddeeaad25aL, 1741}, {0xd60b3bd56a5586f1L, 1744},
{0x85c7056562757456L, 1748}, {0xa738c6bebb12d16cL, 1751},
{0xd106f86e69d785c7L, 1754}, {0x82a45b450226b39cL, 1758},
{0xa34d721642b06084L, 1761}, {0xcc20ce9bd35c78a5L, 1764},
{0xff290242c83396ceL, 1767}, {0x9f79a169bd203e41L, 1771},
{0xc75809c42c684dd1L, 1774}, {0xf92e0c3537826145L, 1777},
{0x9bbcc7a142b17ccbL, 1781}, {0xc2abf989935ddbfeL, 1784},
{0xf356f7ebf83552feL, 1787}, {0x98165af37b2153deL, 1791},
{0xbe1bf1b059e9a8d6L, 1794}, {0xeda2ee1c7064130cL, 1797},
{0x9485d4d1c63e8be7L, 1801}, {0xb9a74a0637ce2ee1L, 1804},
{0xe8111c87c5c1ba99L, 1807}, {0x910ab1d4db9914a0L, 1811},
{0xb54d5e4a127f59c8L, 1814}, {0xe2a0b5dc971f303aL, 1817},
{0x8da471a9de737e24L, 1821}, {0xb10d8e1456105dadL, 1824},
{0xdd50f1996b947518L, 1827}, {0x8a5296ffe33cc92fL, 1831},
{0xace73cbfdc0bfb7bL, 1834}, {0xd8210befd30efa5aL, 1837},
{0x8714a775e3e95c78L, 1841}, {0xa8d9d1535ce3b396L, 1844},
{0xd31045a8341ca07cL, 1847}, {0x83ea2b892091e44dL, 1851},
{0xa4e4b66b68b65d60L, 1854}, {0xce1de40642e3f4b9L, 1857},
{0x80d2ae83e9ce78f3L, 1861}, {0xa1075a24e4421730L, 1864},
{0xc94930ae1d529cfcL, 1867}, {0xfb9b7cd9a4a7443cL, 1870},
{0x9d412e0806e88aa5L, 1874}, {0xc491798a08a2ad4eL, 1877},
{0xf5b5d7ec8acb58a2L, 1880}, {0x9991a6f3d6bf1765L, 1884},
{0xbff610b0cc6edd3fL, 1887}, {0xeff394dcff8a948eL, 1890},
{0x95f83d0a1fb69cd9L, 1894}, {0xbb764c4ca7a4440fL, 1897},
{0xea53df5fd18d5513L, 1900}, {0x92746b9be2f8552cL, 1904},
{0xb7118682dbb66a77L, 1907}, {0xe4d5e82392a40515L, 1910},
{0x8f05b1163ba6832dL, 1914}, {0xb2c71d5bca9023f8L, 1917},
{0xdf78e4b2bd342cf6L, 1920}, {0x8bab8eefb6409c1aL, 1924},
{0xae9672aba3d0c320L, 1927}, {0xda3c0f568cc4f3e8L, 1930},
{0x8865899617fb1871L, 1934}, {0xaa7eebfb9df9de8dL, 1937},
{0xd51ea6fa85785631L, 1940}, {0x8533285c936b35deL, 1944},
{0xa67ff273b8460356L, 1947}, {0xd01fef10a657842cL, 1950},
{0x8213f56a67f6b29bL, 1954}, {0xa298f2c501f45f42L, 1957},
{0xcb3f2f7642717713L, 1960}, {0xfe0efb53d30dd4d7L, 1963},
{0x9ec95d1463e8a506L, 1967}, {0xc67bb4597ce2ce48L, 1970},
{0xf81aa16fdc1b81daL, 1973}, {0x9b10a4e5e9913128L, 1977},
{0xc1d4ce1f63f57d72L, 1980}, {0xf24a01a73cf2dccfL, 1983},
{0x976e41088617ca01L, 1987}, {0xbd49d14aa79dbc82L, 1990},
{0xec9c459d51852ba2L, 1993}, {0x93e1ab8252f33b45L, 1997},
{0xb8da1662e7b00a17L, 2000}, {0xe7109bfba19c0c9dL, 2003},
{0x906a617d450187e2L, 2007}, {0xb484f9dc9641e9daL, 2010},
{0xe1a63853bbd26451L, 2013}, {0x8d07e33455637eb2L, 2017},
{0xb049dc016abc5e5fL, 2020}, {0xdc5c5301c56b75f7L, 2023},
{0x89b9b3e11b6329baL, 2027}, {0xac2820d9623bf429L, 2030},
{0xd732290fbacaf133L, 2033}, {0x867f59a9d4bed6c0L, 2037},
{0xa81f301449ee8c70L, 2040}, {0xd226fc195c6a2f8cL, 2043},
{0x83585d8fd9c25db7L, 2047}, {0xa42e74f3d032f525L, 2050},
{0xcd3a1230c43fb26fL, 2053}, {0x80444b5e7aa7cf85L, 2057},
{0xa0555e361951c366L, 2060}, {0xc86ab5c39fa63440L, 2063},
{0xfa856334878fc150L, 2066}, {0x9c935e00d4b9d8d2L, 2070},
{0xc3b8358109e84f07L, 2073}, {0xf4a642e14c6262c8L, 2076},
{0x98e7e9cccfbd7dbdL, 2080}, {0xbf21e44003acdd2cL, 2083},
{0xeeea5d5004981478L, 2086}, {0x95527a5202df0ccbL, 2090},
{0xbaa718e68396cffdL, 2093}, {0xe950df20247c83fdL, 2096},
{0x91d28b7416cdd27eL, 2100}, {0xb6472e511c81471dL, 2103},
{0xe3d8f9e563a198e5L, 2106}, {0x8e679c2f5e44ff8fL, 2110}};
// A complement from power_of_ten_components
// complete to a 128-bit mantissa.
const uint64_t mantissa_128[] = {
0x419ea3bd35385e2d,
0x52064cac828675b9,
0x7343efebd1940993,
0x1014ebe6c5f90bf8,
0xd41a26e077774ef6,
0x8920b098955522b4,
0x55b46e5f5d5535b0,
0xeb2189f734aa831d,
0xa5e9ec7501d523e4,
0x47b233c92125366e,
0x999ec0bb696e840a,
0xc00670ea43ca250d,
0x380406926a5e5728,
0xc605083704f5ecf2,
0xf7864a44c633682e,
0x7ab3ee6afbe0211d,
0x5960ea05bad82964,
0x6fb92487298e33bd,
0xa5d3b6d479f8e056,
0x8f48a4899877186c,
0x331acdabfe94de87,
0x9ff0c08b7f1d0b14,
0x7ecf0ae5ee44dd9,
0xc9e82cd9f69d6150,
0xbe311c083a225cd2,
0x6dbd630a48aaf406,
0x92cbbccdad5b108,
0x25bbf56008c58ea5,
0xaf2af2b80af6f24e,
0x1af5af660db4aee1,
0x50d98d9fc890ed4d,
0xe50ff107bab528a0,
0x1e53ed49a96272c8,
0x25e8e89c13bb0f7a,
0x77b191618c54e9ac,
0xd59df5b9ef6a2417,
0x4b0573286b44ad1d,
0x4ee367f9430aec32,
0x229c41f793cda73f,
0x6b43527578c1110f,
0x830a13896b78aaa9,
0x23cc986bc656d553,
0x2cbfbe86b7ec8aa8,
0x7bf7d71432f3d6a9,
0xdaf5ccd93fb0cc53,
0xd1b3400f8f9cff68,
0x23100809b9c21fa1,
0xabd40a0c2832a78a,
0x16c90c8f323f516c,
0xae3da7d97f6792e3,
0x99cd11cfdf41779c,
0x40405643d711d583,
0x482835ea666b2572,
0xda3243650005eecf,
0x90bed43e40076a82,
0x5a7744a6e804a291,
0x711515d0a205cb36,
0xd5a5b44ca873e03,
0xe858790afe9486c2,
0x626e974dbe39a872,
0xfb0a3d212dc8128f,
0x7ce66634bc9d0b99,
0x1c1fffc1ebc44e80,
0xa327ffb266b56220,
0x4bf1ff9f0062baa8,
0x6f773fc3603db4a9,
0xcb550fb4384d21d3,
0x7e2a53a146606a48,
0x2eda7444cbfc426d,
0xfa911155fefb5308,
0x793555ab7eba27ca,
0x4bc1558b2f3458de,
0x9eb1aaedfb016f16,
0x465e15a979c1cadc,
0xbfacd89ec191ec9,
0xcef980ec671f667b,
0x82b7e12780e7401a,
0xd1b2ecb8b0908810,
0x861fa7e6dcb4aa15,
0x67a791e093e1d49a,
0xe0c8bb2c5c6d24e0,
0x58fae9f773886e18,
0xaf39a475506a899e,
0x6d8406c952429603,
0xc8e5087ba6d33b83,
0xfb1e4a9a90880a64,
0x5cf2eea09a55067f,
0xf42faa48c0ea481e,
0xf13b94daf124da26,
0x76c53d08d6b70858,
0x54768c4b0c64ca6e,
0xa9942f5dcf7dfd09,
0xd3f93b35435d7c4c,
0xc47bc5014a1a6daf,
0x359ab6419ca1091b,
0xc30163d203c94b62,
0x79e0de63425dcf1d,
0x985915fc12f542e4,
0x3e6f5b7b17b2939d,
0xa705992ceecf9c42,
0x50c6ff782a838353,
0xa4f8bf5635246428,
0x871b7795e136be99,
0x28e2557b59846e3f,
0x331aeada2fe589cf,
0x3ff0d2c85def7621,
0xfed077a756b53a9,
0xd3e8495912c62894,
0x64712dd7abbbd95c,
0xbd8d794d96aacfb3,
0xecf0d7a0fc5583a0,
0xf41686c49db57244,
0x311c2875c522ced5,
0x7d633293366b828b,
0xae5dff9c02033197,
0xd9f57f830283fdfc,
0xd072df63c324fd7b,
0x4247cb9e59f71e6d,
0x52d9be85f074e608,
0x67902e276c921f8b,
0xba1cd8a3db53b6,
0x80e8a40eccd228a4,
0x6122cd128006b2cd,
0x796b805720085f81,
0xcbe3303674053bb0,
0xbedbfc4411068a9c,
0xee92fb5515482d44,
0x751bdd152d4d1c4a,
0xd262d45a78a0635d,
0x86fb897116c87c34,
0xd45d35e6ae3d4da0,
0x8974836059cca109,
0x2bd1a438703fc94b,
0x7b6306a34627ddcf,
0x1a3bc84c17b1d542,
0x20caba5f1d9e4a93,
0x547eb47b7282ee9c,
0xe99e619a4f23aa43,
0x6405fa00e2ec94d4,
0xde83bc408dd3dd04,
0x9624ab50b148d445,
0x3badd624dd9b0957,
0xe54ca5d70a80e5d6,
0x5e9fcf4ccd211f4c,
0x7647c3200069671f,
0x29ecd9f40041e073,
0xf468107100525890,
0x7182148d4066eeb4,
0xc6f14cd848405530,
0xb8ada00e5a506a7c,
0xa6d90811f0e4851c,
0x908f4a166d1da663,
0x9a598e4e043287fe,
0x40eff1e1853f29fd,
0xd12bee59e68ef47c,
0x82bb74f8301958ce,
0xe36a52363c1faf01,
0xdc44e6c3cb279ac1,
0x29ab103a5ef8c0b9,
0x7415d448f6b6f0e7,
0x111b495b3464ad21,
0xcab10dd900beec34,
0x3d5d514f40eea742,
0xcb4a5a3112a5112,
0x47f0e785eaba72ab,
0x59ed216765690f56,
0x306869c13ec3532c,
0x1e414218c73a13fb,
0xe5d1929ef90898fa,
0xdf45f746b74abf39,
0x6b8bba8c328eb783,
0x66ea92f3f326564,
0xc80a537b0efefebd,
0xbd06742ce95f5f36,
0x2c48113823b73704,
0xf75a15862ca504c5,
0x9a984d73dbe722fb,
0xc13e60d0d2e0ebba,
0x318df905079926a8,
0xfdf17746497f7052,
0xfeb6ea8bedefa633,
0xfe64a52ee96b8fc0,
0x3dfdce7aa3c673b0,
0x6bea10ca65c084e,
0x486e494fcff30a62,
0x5a89dba3c3efccfa,
0xf89629465a75e01c,
0xf6bbb397f1135823,
0x746aa07ded582e2c,
0xa8c2a44eb4571cdc,
0x92f34d62616ce413,
0x77b020baf9c81d17,
0xace1474dc1d122e,
0xd819992132456ba,
0x10e1fff697ed6c69,
0xca8d3ffa1ef463c1,
0xbd308ff8a6b17cb2,
0xac7cb3f6d05ddbde,
0x6bcdf07a423aa96b,
0x86c16c98d2c953c6,
0xe871c7bf077ba8b7,
0x11471cd764ad4972,
0xd598e40d3dd89bcf,
0x4aff1d108d4ec2c3,
0xcedf722a585139ba,
0xc2974eb4ee658828,
0x733d226229feea32,
0x806357d5a3f525f,
0xca07c2dcb0cf26f7,
0xfc89b393dd02f0b5,
0xbbac2078d443ace2,
0xd54b944b84aa4c0d,
0xa9e795e65d4df11,
0x4d4617b5ff4a16d5,
0x504bced1bf8e4e45,
0xe45ec2862f71e1d6,
0x5d767327bb4e5a4c,
0x3a6a07f8d510f86f,
0x890489f70a55368b,
0x2b45ac74ccea842e,
0x3b0b8bc90012929d,
0x9ce6ebb40173744,
0xcc420a6a101d0515,
0x9fa946824a12232d,
0x47939822dc96abf9,
0x59787e2b93bc56f7,
0x57eb4edb3c55b65a,
0xede622920b6b23f1,
0xe95fab368e45eced,
0x11dbcb0218ebb414,
0xd652bdc29f26a119,
0x4be76d3346f0495f,
0x6f70a4400c562ddb,
0xcb4ccd500f6bb952,
0x7e2000a41346a7a7,
0x8ed400668c0c28c8,
0x728900802f0f32fa,
0x4f2b40a03ad2ffb9,
0xe2f610c84987bfa8,
0xdd9ca7d2df4d7c9,
0x91503d1c79720dbb,
0x75a44c6397ce912a,
0xc986afbe3ee11aba,
0xfbe85badce996168,
0xfae27299423fb9c3,
0xdccd879fc967d41a,
0x5400e987bbc1c920,
0x290123e9aab23b68,
0xf9a0b6720aaf6521,
0xf808e40e8d5b3e69,
0xb60b1d1230b20e04,
0xb1c6f22b5e6f48c2,
0x1e38aeb6360b1af3,
0x25c6da63c38de1b0,
0x579c487e5a38ad0e,
0x2d835a9df0c6d851,
0xf8e431456cf88e65,
0x1b8e9ecb641b58ff,
0xe272467e3d222f3f,
0x5b0ed81dcc6abb0f,
0x98e947129fc2b4e9,
0x3f2398d747b36224,
0x8eec7f0d19a03aad,
0x1953cf68300424ac,
0x5fa8c3423c052dd7,
0x3792f412cb06794d,
0xe2bbd88bbee40bd0,
0x5b6aceaeae9d0ec4,
0xf245825a5a445275,
0xeed6e2f0f0d56712,
0x55464dd69685606b,
0xaa97e14c3c26b886,
0xd53dd99f4b3066a8,
0xe546a8038efe4029,
0xde98520472bdd033,
0x963e66858f6d4440,
0xdde7001379a44aa8,
0x5560c018580d5d52,
0xaab8f01e6e10b4a6,
0xcab3961304ca70e8,
0x3d607b97c5fd0d22,
0x8cb89a7db77c506a,
0x77f3608e92adb242,
0x55f038b237591ed3,
0x6b6c46dec52f6688,
0x2323ac4b3b3da015,
0xabec975e0a0d081a,
0x96e7bd358c904a21,
0x7e50d64177da2e54,
0xdde50bd1d5d0b9e9,
0x955e4ec64b44e864,
0xbd5af13bef0b113e,
0xecb1ad8aeacdd58e,
0x67de18eda5814af2,
0x80eacf948770ced7,
0xa1258379a94d028d,
0x96ee45813a04330,
0x8bca9d6e188853fc,
0x775ea264cf55347d,
0x95364afe032a819d,
0x3a83ddbd83f52204,
0xc4926a9672793542,
0x75b7053c0f178293,
0x5324c68b12dd6338,
0xd3f6fc16ebca5e03,
0x88f4bb1ca6bcf584,
0x2b31e9e3d06c32e5,
0x3aff322e62439fcf,
0x9befeb9fad487c2,
0x4c2ebe687989a9b3,
0xf9d37014bf60a10,
0x538484c19ef38c94,
0x2865a5f206b06fb9,
0xf93f87b7442e45d3,
0xf78f69a51539d748,
0xb573440e5a884d1b,
0x31680a88f8953030,
0xfdc20d2b36ba7c3d,
0x3d32907604691b4c,
0xa63f9a49c2c1b10f,
0xfcf80dc33721d53,
0xd3c36113404ea4a8,
0x645a1cac083126e9,
0x3d70a3d70a3d70a3,
0xcccccccccccccccc,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x4000000000000000,
0x5000000000000000,
0xa400000000000000,
0x4d00000000000000,
0xf020000000000000,
0x6c28000000000000,
0xc732000000000000,
0x3c7f400000000000,
0x4b9f100000000000,
0x1e86d40000000000,
0x1314448000000000,
0x17d955a000000000,
0x5dcfab0800000000,
0x5aa1cae500000000,
0xf14a3d9e40000000,
0x6d9ccd05d0000000,
0xe4820023a2000000,
0xdda2802c8a800000,
0xd50b2037ad200000,
0x4526f422cc340000,
0x9670b12b7f410000,
0x3c0cdd765f114000,
0xa5880a69fb6ac800,
0x8eea0d047a457a00,
0x72a4904598d6d880,
0x47a6da2b7f864750,
0x999090b65f67d924,
0xfff4b4e3f741cf6d,
0xbff8f10e7a8921a4,
0xaff72d52192b6a0d,
0x9bf4f8a69f764490,
0x2f236d04753d5b4,
0x1d762422c946590,
0x424d3ad2b7b97ef5,
0xd2e0898765a7deb2,
0x63cc55f49f88eb2f,
0x3cbf6b71c76b25fb,
0x8bef464e3945ef7a,
0x97758bf0e3cbb5ac,
0x3d52eeed1cbea317,
0x4ca7aaa863ee4bdd,
0x8fe8caa93e74ef6a,
0xb3e2fd538e122b44,
0x60dbbca87196b616,
0xbc8955e946fe31cd,
0x6babab6398bdbe41,
0xc696963c7eed2dd1,
0xfc1e1de5cf543ca2,
0x3b25a55f43294bcb,
0x49ef0eb713f39ebe,
0x6e3569326c784337,
0x49c2c37f07965404,
0xdc33745ec97be906,
0x69a028bb3ded71a3,
0xc40832ea0d68ce0c,
0xf50a3fa490c30190,
0x792667c6da79e0fa,
0x577001b891185938,
0xed4c0226b55e6f86,
0x544f8158315b05b4,
0x696361ae3db1c721,
0x3bc3a19cd1e38e9,
0x4ab48a04065c723,
0x62eb0d64283f9c76,
0x3ba5d0bd324f8394,
0xca8f44ec7ee36479,
0x7e998b13cf4e1ecb,
0x9e3fedd8c321a67e,
0xc5cfe94ef3ea101e,
0xbba1f1d158724a12,
0x2a8a6e45ae8edc97,
0xf52d09d71a3293bd,
0x593c2626705f9c56,
0x6f8b2fb00c77836c,
0xb6dfb9c0f956447,
0x4724bd4189bd5eac,
0x58edec91ec2cb657,
0x2f2967b66737e3ed,
0xbd79e0d20082ee74,
0xecd8590680a3aa11,
0xe80e6f4820cc9495,
0x3109058d147fdcdd,
0xbd4b46f0599fd415,
0x6c9e18ac7007c91a,
0x3e2cf6bc604ddb0,
0x84db8346b786151c,
0xe612641865679a63,
0x4fcb7e8f3f60c07e,
0xe3be5e330f38f09d,
0x5cadf5bfd3072cc5,
0x73d9732fc7c8f7f6,
0x2867e7fddcdd9afa,
0xb281e1fd541501b8,
0x1f225a7ca91a4226,
0x3375788de9b06958,
0x52d6b1641c83ae,
0xc0678c5dbd23a49a,
0xf840b7ba963646e0,
0xb650e5a93bc3d898,
0xa3e51f138ab4cebe,
0xc66f336c36b10137,
0xb80b0047445d4184,
0xa60dc059157491e5,
0x87c89837ad68db2f,
0x29babe4598c311fb,
0xf4296dd6fef3d67a,
0x1899e4a65f58660c,
0x5ec05dcff72e7f8f,
0x76707543f4fa1f73,
0x6a06494a791c53a8,
0x487db9d17636892,
0x45a9d2845d3c42b6,
0xb8a2392ba45a9b2,
0x8e6cac7768d7141e,
0x3207d795430cd926,
0x7f44e6bd49e807b8,
0x5f16206c9c6209a6,
0x36dba887c37a8c0f,
0xc2494954da2c9789,
0xf2db9baa10b7bd6c,
0x6f92829494e5acc7,
0xcb772339ba1f17f9,
0xff2a760414536efb,
0xfef5138519684aba,
0x7eb258665fc25d69,
0xef2f773ffbd97a61,
0xaafb550ffacfd8fa,
0x95ba2a53f983cf38,
0xdd945a747bf26183,
0x94f971119aeef9e4,
0x7a37cd5601aab85d,
0xac62e055c10ab33a,
0x577b986b314d6009,
0xed5a7e85fda0b80b,
0x14588f13be847307,
0x596eb2d8ae258fc8,
0x6fca5f8ed9aef3bb,
0x25de7bb9480d5854,
0xaf561aa79a10ae6a,
0x1b2ba1518094da04,
0x90fb44d2f05d0842,
0x353a1607ac744a53,
0x42889b8997915ce8,
0x69956135febada11,
0x43fab9837e699095,
0x94f967e45e03f4bb,
0x1d1be0eebac278f5,
0x6462d92a69731732,
0x7d7b8f7503cfdcfe,
0x5cda735244c3d43e,
0x3a0888136afa64a7,
0x88aaa1845b8fdd0,
0x8aad549e57273d45,
0x36ac54e2f678864b,
0x84576a1bb416a7dd,
0x656d44a2a11c51d5,
0x9f644ae5a4b1b325,
0x873d5d9f0dde1fee,
0xa90cb506d155a7ea,
0x9a7f12442d588f2,
0xc11ed6d538aeb2f,
0x8f1668c8a86da5fa,
0xf96e017d694487bc,
0x37c981dcc395a9ac,
0x85bbe253f47b1417,
0x93956d7478ccec8e,
0x387ac8d1970027b2,
0x6997b05fcc0319e,
0x441fece3bdf81f03,
0xd527e81cad7626c3,
0x8a71e223d8d3b074,
0xf6872d5667844e49,
0xb428f8ac016561db,
0xe13336d701beba52,
0xecc0024661173473,
0x27f002d7f95d0190,
0x31ec038df7b441f4,
0x7e67047175a15271,
0xf0062c6e984d386,
0x52c07b78a3e60868,
0xa7709a56ccdf8a82,
0x88a66076400bb691,
0x6acff893d00ea435,
0x583f6b8c4124d43,
0xc3727a337a8b704a,
0x744f18c0592e4c5c,
0x1162def06f79df73,
0x8addcb5645ac2ba8,
0x6d953e2bd7173692,
0xc8fa8db6ccdd0437,
0x1d9c9892400a22a2,
0x2503beb6d00cab4b,
0x2e44ae64840fd61d,
0x5ceaecfed289e5d2,
0x7425a83e872c5f47,
0xd12f124e28f77719,
0x82bd6b70d99aaa6f,
0x636cc64d1001550b,
0x3c47f7e05401aa4e,
0x65acfaec34810a71,
0x7f1839a741a14d0d,
0x1ede48111209a050,
0x934aed0aab460432,
0xf81da84d5617853f,
0x36251260ab9d668e,
0xc1d72b7c6b426019,
0xb24cf65b8612f81f,
0xdee033f26797b627,
0x169840ef017da3b1,
0x8e1f289560ee864e,
0xf1a6f2bab92a27e2,
0xae10af696774b1db,
0xacca6da1e0a8ef29,
0x17fd090a58d32af3,
0xddfc4b4cef07f5b0,
0x4abdaf101564f98e,
0x9d6d1ad41abe37f1,
0x84c86189216dc5ed,
0x32fd3cf5b4e49bb4,
0x3fbc8c33221dc2a1,
0xfabaf3feaa5334a,
0x29cb4d87f2a7400e,
0x743e20e9ef511012,
0x914da9246b255416,
0x1ad089b6c2f7548e,
0xa184ac2473b529b1,
0xc9e5d72d90a2741e,
0x7e2fa67c7a658892,
0xddbb901b98feeab7,
0x552a74227f3ea565,
0xd53a88958f87275f,
0x8a892abaf368f137,
0x2d2b7569b0432d85,
0x9c3b29620e29fc73,
0x8349f3ba91b47b8f,
0x241c70a936219a73,
0xed238cd383aa0110,
0xf4363804324a40aa,
0xb143c6053edcd0d5,
0xdd94b7868e94050a,
0xca7cf2b4191c8326,
0xfd1c2f611f63a3f0,
0xbc633b39673c8cec,
0xd5be0503e085d813,
0x4b2d8644d8a74e18,
0xddf8e7d60ed1219e,
0xcabb90e5c942b503,
0x3d6a751f3b936243,
0xcc512670a783ad4,
0x27fb2b80668b24c5,
0xb1f9f660802dedf6,
0x5e7873f8a0396973,
0xdb0b487b6423e1e8,
0x91ce1a9a3d2cda62,
0x7641a140cc7810fb,
0xa9e904c87fcb0a9d,
0x546345fa9fbdcd44,
0xa97c177947ad4095,
0x49ed8eabcccc485d,
0x5c68f256bfff5a74,
0x73832eec6fff3111,
0xc831fd53c5ff7eab,
0xba3e7ca8b77f5e55,
0x28ce1bd2e55f35eb,
0x7980d163cf5b81b3,
0xd7e105bcc332621f,
0x8dd9472bf3fefaa7,
0xb14f98f6f0feb951,
0x6ed1bf9a569f33d3,
0xa862f80ec4700c8,
0xcd27bb612758c0fa,
0x8038d51cb897789c,
0xe0470a63e6bd56c3,
0x1858ccfce06cac74,
0xf37801e0c43ebc8,
0xd30560258f54e6ba,
0x47c6b82ef32a2069,
0x4cdc331d57fa5441,
0xe0133fe4adf8e952,
0x58180fddd97723a6,
0x570f09eaa7ea7648,
};
} // namespace simdjson
#endif // SIMDJSON_JSONCHARUTILS_H
/* end file src/jsoncharutils.h */
/* simdprune_tables.h already included: #include "simdprune_tables.h" */
#if SIMDJSON_IMPLEMENTATION_ARM64
/* begin file src/arm64/implementation.cpp */
/* arm64/implementation.h already included: #include "arm64/implementation.h" */
/* begin file src/arm64/dom_parser_implementation.h */
#ifndef SIMDJSON_ARM64_DOM_PARSER_IMPLEMENTATION_H
#define SIMDJSON_ARM64_DOM_PARSER_IMPLEMENTATION_H
/* isadetection.h already included: #include "isadetection.h" */
namespace simdjson {
namespace arm64 {
/* begin file src/generic/dom_parser_implementation.h */
// expectation: sizeof(scope_descriptor) = 64/8.
struct scope_descriptor {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct scope_descriptor
#ifdef SIMDJSON_USE_COMPUTED_GOTO
typedef void* ret_address_t;
#else
typedef char ret_address_t;
#endif
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<scope_descriptor[]> containing_scope{};
/** Return address of each open { or [ */
std::unique_ptr<ret_address_t[]> ret_address{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
/** Error code (TODO remove, this is not even used, we just set it so the g++ optimizer doesn't get confused) */
error_code error{UNINITIALIZED};
really_inline dom_parser_implementation();
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation & operator=(const dom_parser_implementation &) = delete;
WARN_UNUSED error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
WARN_UNUSED error_code stage1(const uint8_t *buf, size_t len, bool partial) noexcept final;
WARN_UNUSED error_code check_for_unclosed_array() noexcept;
WARN_UNUSED error_code stage2(dom::document &doc) noexcept final;
WARN_UNUSED error_code stage2_next(dom::document &doc) noexcept final;
WARN_UNUSED error_code set_capacity(size_t capacity) noexcept final;
WARN_UNUSED error_code set_max_depth(size_t max_depth) noexcept final;
};
/* begin file src/generic/stage1/allocate.h */
namespace stage1 {
namespace allocate {
//
// Allocates stage 1 internal state and outputs in the parser
//
really_inline error_code set_capacity(internal::dom_parser_implementation &parser, size_t capacity) {
size_t max_structures = ROUNDUP_N(capacity, 64) + 2 + 7;
parser.structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!parser.structural_indexes) { return MEMALLOC; }
parser.structural_indexes[0] = 0;
parser.n_structural_indexes = 0;
return SUCCESS;
}
} // namespace allocate
} // namespace stage1
/* end file src/generic/stage1/allocate.h */
/* begin file src/generic/stage2/allocate.h */
namespace stage2 {
namespace allocate {
//
// Allocates stage 2 internal state and outputs in the parser
//
really_inline error_code set_max_depth(dom_parser_implementation &parser, size_t max_depth) {
parser.containing_scope.reset(new (std::nothrow) scope_descriptor[max_depth]);
parser.ret_address.reset(new (std::nothrow) ret_address_t[max_depth]);
if (!parser.ret_address || !parser.containing_scope) {
return MEMALLOC;
}
return SUCCESS;
}
} // namespace allocate
} // namespace stage2
/* end file src/generic/stage2/allocate.h */
really_inline dom_parser_implementation::dom_parser_implementation() {}
// Leaving these here so they can be inlined if so desired
WARN_UNUSED error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
error_code err = stage1::allocate::set_capacity(*this, capacity);
if (err) { _capacity = 0; return err; }
_capacity = capacity;
return SUCCESS;
}
WARN_UNUSED error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
error_code err = stage2::allocate::set_max_depth(*this, max_depth);
if (err) { _max_depth = 0; return err; }
_max_depth = max_depth;
return SUCCESS;
}
/* end file src/generic/stage2/allocate.h */
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_DOM_PARSER_IMPLEMENTATION_H
/* end file src/generic/stage2/allocate.h */
TARGET_HASWELL
namespace simdjson {
namespace arm64 {
WARN_UNUSED error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
dst->set_capacity(capacity);
dst->set_max_depth(max_depth);
return SUCCESS;
}
} // namespace arm64
} // namespace simdjson
UNTARGET_REGION
/* end file src/generic/stage2/allocate.h */
/* begin file src/arm64/dom_parser_implementation.cpp */
/* arm64/implementation.h already included: #include "arm64/implementation.h" */
/* arm64/dom_parser_implementation.h already included: #include "arm64/dom_parser_implementation.h" */
//
// Stage 1
//
/* begin file src/arm64/bitmask.h */
#ifndef SIMDJSON_ARM64_BITMASK_H
#define SIMDJSON_ARM64_BITMASK_H
/* begin file src/arm64/intrinsics.h */
#ifndef SIMDJSON_ARM64_INTRINSICS_H
#define SIMDJSON_ARM64_INTRINSICS_H
// This should be the correct header whether
// you use visual studio or other compilers.
#include <arm_neon.h>
#endif // SIMDJSON_ARM64_INTRINSICS_H
/* end file src/arm64/intrinsics.h */
namespace simdjson {
namespace arm64 {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
really_inline uint64_t prefix_xor(uint64_t bitmask) {
/////////////
// We could do this with PMULL, but it is apparently slow.
//
//#ifdef __ARM_FEATURE_CRYPTO // some ARM processors lack this extension
//return vmull_p64(-1ULL, bitmask);
//#else
// Analysis by @sebpop:
// When diffing the assembly for src/stage1_find_marks.cpp I see that the eors are all spread out
// in between other vector code, so effectively the extra cycles of the sequence do not matter
// because the GPR units are idle otherwise and the critical path is on the FP side.
// Also the PMULL requires two extra fmovs: GPR->FP (3 cycles in N1, 5 cycles in A72 )
// and FP->GPR (2 cycles on N1 and 5 cycles on A72.)
///////////
bitmask ^= bitmask << 1;
bitmask ^= bitmask << 2;
bitmask ^= bitmask << 4;
bitmask ^= bitmask << 8;
bitmask ^= bitmask << 16;
bitmask ^= bitmask << 32;
return bitmask;
}
} // namespace arm64
} // namespace simdjson
UNTARGET_REGION
#endif
/* end file src/arm64/intrinsics.h */
/* begin file src/arm64/simd.h */
#ifndef SIMDJSON_ARM64_SIMD_H
#define SIMDJSON_ARM64_SIMD_H
/* simdprune_tables.h already included: #include "simdprune_tables.h" */
/* begin file src/arm64/bitmanipulation.h */
#ifndef SIMDJSON_ARM64_BITMANIPULATION_H
#define SIMDJSON_ARM64_BITMANIPULATION_H
/* arm64/intrinsics.h already included: #include "arm64/intrinsics.h" */
namespace simdjson {
namespace arm64 {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
NO_SANITIZE_UNDEFINED
really_inline int trailing_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
really_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
really_inline int leading_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
really_inline int count_ones(uint64_t input_num) {
return vaddv_u8(vcnt_u8(vcreate_u8(input_num)));
}
really_inline bool add_overflow(uint64_t value1, uint64_t value2, uint64_t *result) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
*result = value1 + value2;
return *result < value1;
#else
return __builtin_uaddll_overflow(value1, value2,
(unsigned long long *)result);
#endif
}
really_inline bool mul_overflow(uint64_t value1, uint64_t value2, uint64_t *result) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
*result = value1 * value2;
return !!__umulh(value1, value2);
#else
return __builtin_umulll_overflow(value1, value2, (unsigned long long *)result);
#endif
}
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_BITMANIPULATION_H
/* end file src/arm64/bitmanipulation.h */
/* arm64/intrinsics.h already included: #include "arm64/intrinsics.h" */
#include <type_traits>
namespace simdjson {
namespace arm64 {
namespace simd {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
namespace {
// Start of private section with Visual Studio workaround
/**
* make_uint8x16_t initializes a SIMD register (uint8x16_t).
* This is needed because, incredibly, the syntax uint8x16_t x = {1,2,3...}
* is not recognized under Visual Studio! This is a workaround.
* Using a std::initializer_list<uint8_t> as a parameter resulted in
* inefficient code. With the current approach, if the parameters are
* compile-time constants,
* GNU GCC compiles it to ldr, the same as uint8x16_t x = {1,2,3...}.
* You should not use this function except for compile-time constants:
* it is not efficient.
*/
really_inline uint8x16_t make_uint8x16_t(uint8_t x1, uint8_t x2, uint8_t x3, uint8_t x4,
uint8_t x5, uint8_t x6, uint8_t x7, uint8_t x8,
uint8_t x9, uint8_t x10, uint8_t x11, uint8_t x12,
uint8_t x13, uint8_t x14, uint8_t x15, uint8_t x16) {
// Doing a load like so end ups generating worse code.
// uint8_t array[16] = {x1, x2, x3, x4, x5, x6, x7, x8,
// x9, x10,x11,x12,x13,x14,x15,x16};
// return vld1q_u8(array);
uint8x16_t x{};
// incredibly, Visual Studio does not allow x[0] = x1
x = vsetq_lane_u8(x1, x, 0);
x = vsetq_lane_u8(x2, x, 1);
x = vsetq_lane_u8(x3, x, 2);
x = vsetq_lane_u8(x4, x, 3);
x = vsetq_lane_u8(x5, x, 4);
x = vsetq_lane_u8(x6, x, 5);
x = vsetq_lane_u8(x7, x, 6);
x = vsetq_lane_u8(x8, x, 7);
x = vsetq_lane_u8(x9, x, 8);
x = vsetq_lane_u8(x10, x, 9);
x = vsetq_lane_u8(x11, x, 10);
x = vsetq_lane_u8(x12, x, 11);
x = vsetq_lane_u8(x13, x, 12);
x = vsetq_lane_u8(x14, x, 13);
x = vsetq_lane_u8(x15, x, 14);
x = vsetq_lane_u8(x16, x, 15);
return x;
}
// We have to do the same work for make_int8x16_t
really_inline int8x16_t make_int8x16_t(int8_t x1, int8_t x2, int8_t x3, int8_t x4,
int8_t x5, int8_t x6, int8_t x7, int8_t x8,
int8_t x9, int8_t x10, int8_t x11, int8_t x12,
int8_t x13, int8_t x14, int8_t x15, int8_t x16) {
// Doing a load like so end ups generating worse code.
// int8_t array[16] = {x1, x2, x3, x4, x5, x6, x7, x8,
// x9, x10,x11,x12,x13,x14,x15,x16};
// return vld1q_s8(array);
int8x16_t x{};
// incredibly, Visual Studio does not allow x[0] = x1
x = vsetq_lane_s8(x1, x, 0);
x = vsetq_lane_s8(x2, x, 1);
x = vsetq_lane_s8(x3, x, 2);
x = vsetq_lane_s8(x4, x, 3);
x = vsetq_lane_s8(x5, x, 4);
x = vsetq_lane_s8(x6, x, 5);
x = vsetq_lane_s8(x7, x, 6);
x = vsetq_lane_s8(x8, x, 7);
x = vsetq_lane_s8(x9, x, 8);
x = vsetq_lane_s8(x10, x, 9);
x = vsetq_lane_s8(x11, x, 10);
x = vsetq_lane_s8(x12, x, 11);
x = vsetq_lane_s8(x13, x, 12);
x = vsetq_lane_s8(x14, x, 13);
x = vsetq_lane_s8(x15, x, 14);
x = vsetq_lane_s8(x16, x, 15);
return x;
}
// End of private section with Visual Studio workaround
} // namespace
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
template<typename T>
struct simd8;
//
// Base class of simd8<uint8_t> and simd8<bool>, both of which use uint8x16_t internally.
//
template<typename T, typename Mask=simd8<bool>>
struct base_u8 {
uint8x16_t value;
static const int SIZE = sizeof(value);
// Conversion from/to SIMD register
really_inline base_u8(const uint8x16_t _value) : value(_value) {}
really_inline operator const uint8x16_t&() const { return this->value; }
really_inline operator uint8x16_t&() { return this->value; }
// Bit operations
really_inline simd8<T> operator|(const simd8<T> other) const { return vorrq_u8(*this, other); }
really_inline simd8<T> operator&(const simd8<T> other) const { return vandq_u8(*this, other); }
really_inline simd8<T> operator^(const simd8<T> other) const { return veorq_u8(*this, other); }
really_inline simd8<T> bit_andnot(const simd8<T> other) const { return vbicq_u8(*this, other); }
really_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
really_inline simd8<T>& operator|=(const simd8<T> other) { auto this_cast = (simd8<T>*)this; *this_cast = *this_cast | other; return *this_cast; }
really_inline simd8<T>& operator&=(const simd8<T> other) { auto this_cast = (simd8<T>*)this; *this_cast = *this_cast & other; return *this_cast; }
really_inline simd8<T>& operator^=(const simd8<T> other) { auto this_cast = (simd8<T>*)this; *this_cast = *this_cast ^ other; return *this_cast; }
really_inline Mask operator==(const simd8<T> other) const { return vceqq_u8(*this, other); }
template<int N=1>
really_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return vextq_u8(prev_chunk, *this, 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base_u8<bool> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
static really_inline simd8<bool> splat(bool _value) { return vmovq_n_u8(uint8_t(-(!!_value))); }
really_inline simd8(const uint8x16_t _value) : base_u8<bool>(_value) {}
// False constructor
really_inline simd8() : simd8(vdupq_n_u8(0)) {}
// Splat constructor
really_inline simd8(bool _value) : simd8(splat(_value)) {}
// We return uint32_t instead of uint16_t because that seems to be more efficient for most
// purposes (cutting it down to uint16_t costs performance in some compilers).
really_inline uint32_t to_bitmask() const {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
const uint8x16_t bit_mask = make_uint8x16_t(0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80);
#else
const uint8x16_t bit_mask = {0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80};
#endif
auto minput = *this & bit_mask;
uint8x16_t tmp = vpaddq_u8(minput, minput);
tmp = vpaddq_u8(tmp, tmp);
tmp = vpaddq_u8(tmp, tmp);
return vgetq_lane_u16(vreinterpretq_u16_u8(tmp), 0);
}
really_inline bool any() const { return vmaxvq_u8(*this) != 0; }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base_u8<uint8_t> {
static really_inline uint8x16_t splat(uint8_t _value) { return vmovq_n_u8(_value); }
static really_inline uint8x16_t zero() { return vdupq_n_u8(0); }
static really_inline uint8x16_t load(const uint8_t* values) { return vld1q_u8(values); }
really_inline simd8(const uint8x16_t _value) : base_u8<uint8_t>(_value) {}
// Zero constructor
really_inline simd8() : simd8(zero()) {}
// Array constructor
really_inline simd8(const uint8_t values[16]) : simd8(load(values)) {}
// Splat constructor
really_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Member-by-member initialization
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
really_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(make_uint8x16_t(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
#else
really_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(uint8x16_t{
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
}) {}
#endif
// Repeat 16 values as many times as necessary (usually for lookup tables)
really_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Store to array
really_inline void store(uint8_t dst[16]) const { return vst1q_u8(dst, *this); }
// Saturated math
really_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return vqaddq_u8(*this, other); }
really_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return vqsubq_u8(*this, other); }
// Addition/subtraction are the same for signed and unsigned
really_inline simd8<uint8_t> operator+(const simd8<uint8_t> other) const { return vaddq_u8(*this, other); }
really_inline simd8<uint8_t> operator-(const simd8<uint8_t> other) const { return vsubq_u8(*this, other); }
really_inline simd8<uint8_t>& operator+=(const simd8<uint8_t> other) { *this = *this + other; return *this; }
really_inline simd8<uint8_t>& operator-=(const simd8<uint8_t> other) { *this = *this - other; return *this; }
// Order-specific operations
really_inline uint8_t max() const { return vmaxvq_u8(*this); }
really_inline uint8_t min() const { return vminvq_u8(*this); }
really_inline simd8<uint8_t> max(const simd8<uint8_t> other) const { return vmaxq_u8(*this, other); }
really_inline simd8<uint8_t> min(const simd8<uint8_t> other) const { return vminq_u8(*this, other); }
really_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return vcleq_u8(*this, other); }
really_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return vcgeq_u8(*this, other); }
really_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return vcltq_u8(*this, other); }
really_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return vcgtq_u8(*this, other); }
// Same as >, but instead of guaranteeing all 1's == true, false = 0 and true = nonzero. For ARM, returns all 1's.
really_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return simd8<uint8_t>(*this > other); }
// Same as <, but instead of guaranteeing all 1's == true, false = 0 and true = nonzero. For ARM, returns all 1's.
really_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return simd8<uint8_t>(*this < other); }
// Bit-specific operations
really_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return vtstq_u8(*this, bits); }
really_inline bool any_bits_set_anywhere() const { return this->max() != 0; }
really_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return (*this & bits).any_bits_set_anywhere(); }
template<int N>
really_inline simd8<uint8_t> shr() const { return vshrq_n_u8(*this, N); }
template<int N>
really_inline simd8<uint8_t> shl() const { return vshlq_n_u8(*this, N); }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
really_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return lookup_table.apply_lookup_16_to(*this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 16 - count_ones(mask) bytes of the result are significant but 16 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint16_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
really_inline void compress(uint16_t mask, L * output) const {
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
uint64x2_t shufmask64 = {thintable_epi8[mask1], thintable_epi8[mask2]};
uint8x16_t shufmask = vreinterpretq_u8_u64(shufmask64);
// we increment by 0x08 the second half of the mask
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
uint8x16_t inc = make_uint8x16_t(0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08);
#else
uint8x16_t inc = {0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08};
#endif
shufmask = vaddq_u8(shufmask, inc);
// this is the version "nearly pruned"
uint8x16_t pruned = vqtbl1q_u8(*this, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
uint8x16_t compactmask = vld1q_u8((const uint8_t *)(pshufb_combine_table + pop1 * 8));
uint8x16_t answer = vqtbl1q_u8(pruned, compactmask);
vst1q_u8((uint8_t*) output, answer);
}
template<typename L>
really_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
template<typename T>
really_inline simd8<uint8_t> apply_lookup_16_to(const simd8<T> original) {
return vqtbl1q_u8(*this, simd8<uint8_t>(original));
}
};
// Signed bytes
template<>
struct simd8<int8_t> {
int8x16_t value;
static really_inline simd8<int8_t> splat(int8_t _value) { return vmovq_n_s8(_value); }
static really_inline simd8<int8_t> zero() { return vdupq_n_s8(0); }
static really_inline simd8<int8_t> load(const int8_t values[16]) { return vld1q_s8(values); }
// Conversion from/to SIMD register
really_inline simd8(const int8x16_t _value) : value{_value} {}
really_inline operator const int8x16_t&() const { return this->value; }
really_inline operator int8x16_t&() { return this->value; }
// Zero constructor
really_inline simd8() : simd8(zero()) {}
// Splat constructor
really_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
really_inline simd8(const int8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
really_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(make_int8x16_t(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
#else
really_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(int8x16_t{
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
}) {}
#endif
// Repeat 16 values as many times as necessary (usually for lookup tables)
really_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Store to array
really_inline void store(int8_t dst[16]) const { return vst1q_s8(dst, *this); }
// Explicit conversion to/from unsigned
//
// Under Visual Studio/ARM64 uint8x16_t and int8x16_t are apparently the same type.
// In theory, we could check this occurence with std::same_as and std::enabled_if but it is C++14
// and relatively ugly and hard to read.
#ifndef SIMDJSON_REGULAR_VISUAL_STUDIO
really_inline explicit simd8(const uint8x16_t other): simd8(vreinterpretq_s8_u8(other)) {}
#endif
really_inline explicit operator simd8<uint8_t>() const { return vreinterpretq_u8_s8(this->value); }
// Math
really_inline simd8<int8_t> operator+(const simd8<int8_t> other) const { return vaddq_s8(*this, other); }
really_inline simd8<int8_t> operator-(const simd8<int8_t> other) const { return vsubq_s8(*this, other); }
really_inline simd8<int8_t>& operator+=(const simd8<int8_t> other) { *this = *this + other; return *this; }
really_inline simd8<int8_t>& operator-=(const simd8<int8_t> other) { *this = *this - other; return *this; }
// Order-sensitive comparisons
really_inline simd8<int8_t> max(const simd8<int8_t> other) const { return vmaxq_s8(*this, other); }
really_inline simd8<int8_t> min(const simd8<int8_t> other) const { return vminq_s8(*this, other); }
really_inline simd8<bool> operator>(const simd8<int8_t> other) const { return vcgtq_s8(*this, other); }
really_inline simd8<bool> operator<(const simd8<int8_t> other) const { return vcltq_s8(*this, other); }
really_inline simd8<bool> operator==(const simd8<int8_t> other) const { return vceqq_s8(*this, other); }
template<int N=1>
really_inline simd8<int8_t> prev(const simd8<int8_t> prev_chunk) const {
return vextq_s8(prev_chunk, *this, 16 - N);
}
// Perform a lookup assuming no value is larger than 16
template<typename L>
really_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return lookup_table.apply_lookup_16_to(*this);
}
template<typename L>
really_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
template<typename T>
really_inline simd8<int8_t> apply_lookup_16_to(const simd8<T> original) {
return vqtbl1q_s8(*this, simd8<uint8_t>(original));
}
};
template<typename T>
struct simd8x64 {
static const int NUM_CHUNKS = 64 / sizeof(simd8<T>);
const simd8<T> chunks[NUM_CHUNKS];
really_inline simd8x64() : chunks{simd8<T>(), simd8<T>(), simd8<T>(), simd8<T>()} {}
really_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1, const simd8<T> chunk2, const simd8<T> chunk3) : chunks{chunk0, chunk1, chunk2, chunk3} {}
really_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+16), simd8<T>::load(ptr+32), simd8<T>::load(ptr+48)} {}
really_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
this->chunks[2].store(ptr+sizeof(simd8<T>)*2);
this->chunks[3].store(ptr+sizeof(simd8<T>)*3);
}
really_inline void compress(uint64_t mask, T * output) const {
this->chunks[0].compress(uint16_t(mask), output);
this->chunks[1].compress(uint16_t(mask >> 16), output + 16 - count_ones(mask & 0xFFFF));
this->chunks[2].compress(uint16_t(mask >> 32), output + 32 - count_ones(mask & 0xFFFFFFFF));
this->chunks[3].compress(uint16_t(mask >> 48), output + 48 - count_ones(mask & 0xFFFFFFFFFFFF));
}
template <typename F>
static really_inline void each_index(F const& each) {
each(0);
each(1);
each(2);
each(3);
}
really_inline uint64_t to_bitmask() const {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
const uint8x16_t bit_mask = make_uint8x16_t(
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80
);
#else
const uint8x16_t bit_mask = {
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80
};
#endif
// Add each of the elements next to each other, successively, to stuff each 8 byte mask into one.
uint8x16_t sum0 = vpaddq_u8(this->chunks[0] & bit_mask, this->chunks[1] & bit_mask);
uint8x16_t sum1 = vpaddq_u8(this->chunks[2] & bit_mask, this->chunks[3] & bit_mask);
sum0 = vpaddq_u8(sum0, sum1);
sum0 = vpaddq_u8(sum0, sum0);
return vgetq_lane_u64(vreinterpretq_u64_u8(sum0), 0);
}
really_inline simd8x64<T> bit_or(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<T>(
this->chunks[0] | mask,
this->chunks[1] | mask,
this->chunks[2] | mask,
this->chunks[3] | mask
);
}
really_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask,
this->chunks[2] == mask,
this->chunks[3] == mask
).to_bitmask();
}
really_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask,
this->chunks[2] <= mask,
this->chunks[3] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_SIMD_H
/* end file src/arm64/bitmanipulation.h */
/* arm64/bitmanipulation.h already included: #include "arm64/bitmanipulation.h" */
namespace simdjson {
namespace arm64 {
using namespace simd;
struct json_character_block {
static really_inline json_character_block classify(const simd::simd8x64<uint8_t> in);
really_inline uint64_t whitespace() const { return _whitespace; }
really_inline uint64_t op() const { return _op; }
really_inline uint64_t scalar() { return ~(op() | whitespace()); }
uint64_t _whitespace;
uint64_t _op;
};
really_inline json_character_block json_character_block::classify(const simd::simd8x64<uint8_t> in) {
// Functional programming causes trouble with Visual Studio.
// Keeping this version in comments since it is much nicer:
// auto v = in.map<uint8_t>([&](simd8<uint8_t> chunk) {
// auto nib_lo = chunk & 0xf;
// auto nib_hi = chunk.shr<4>();
// auto shuf_lo = nib_lo.lookup_16<uint8_t>(16, 0, 0, 0, 0, 0, 0, 0, 0, 8, 12, 1, 2, 9, 0, 0);
// auto shuf_hi = nib_hi.lookup_16<uint8_t>(8, 0, 18, 4, 0, 1, 0, 1, 0, 0, 0, 3, 2, 1, 0, 0);
// return shuf_lo & shuf_hi;
// });
const simd8<uint8_t> table1(16, 0, 0, 0, 0, 0, 0, 0, 0, 8, 12, 1, 2, 9, 0, 0);
const simd8<uint8_t> table2(8, 0, 18, 4, 0, 1, 0, 1, 0, 0, 0, 3, 2, 1, 0, 0);
auto v = simd8x64<uint8_t>(
(in.chunks[0] & 0xf).lookup_16(table1) & (in.chunks[0].shr<4>()).lookup_16(table2),
(in.chunks[1] & 0xf).lookup_16(table1) & (in.chunks[1].shr<4>()).lookup_16(table2),
(in.chunks[2] & 0xf).lookup_16(table1) & (in.chunks[2].shr<4>()).lookup_16(table2),
(in.chunks[3] & 0xf).lookup_16(table1) & (in.chunks[3].shr<4>()).lookup_16(table2)
);
// We compute whitespace and op separately. If the code later only use one or the
// other, given the fact that all functions are aggressively inlined, we can
// hope that useless computations will be omitted. This is namely case when
// minifying (we only need whitespace). *However* if we only need spaces,
// it is likely that we will still compute 'v' above with two lookup_16: one
// could do it a bit cheaper. This is in contrast with the x64 implementations
// where we can, efficiently, do the white space and structural matching
// separately. One reason for this difference is that on ARM NEON, the table
// lookups either zero or leave unchanged the characters exceeding 0xF whereas
// on x64, the equivalent instruction (pshufb) automatically applies a mask,
// ignoring the 4 most significant bits. Thus the x64 implementation is
// optimized differently. This being said, if you use this code strictly
// just for minification (or just to identify the structural characters),
// there is a small untaken optimization opportunity here. We deliberately
// do not pick it up.
uint64_t op = simd8x64<bool>(
v.chunks[0].any_bits_set(0x7),
v.chunks[1].any_bits_set(0x7),
v.chunks[2].any_bits_set(0x7),
v.chunks[3].any_bits_set(0x7)
).to_bitmask();
uint64_t whitespace = simd8x64<bool>(
v.chunks[0].any_bits_set(0x18),
v.chunks[1].any_bits_set(0x18),
v.chunks[2].any_bits_set(0x18),
v.chunks[3].any_bits_set(0x18)
).to_bitmask();
return { whitespace, op };
}
really_inline bool is_ascii(simd8x64<uint8_t> input) {
simd8<uint8_t> bits = (input.chunks[0] | input.chunks[1]) | (input.chunks[2] | input.chunks[3]);
return bits.max() < 0b10000000u;
}
really_inline simd8<bool> must_be_continuation(simd8<uint8_t> prev1, simd8<uint8_t> prev2, simd8<uint8_t> prev3) {
simd8<bool> is_second_byte = prev1 >= uint8_t(0b11000000u);
simd8<bool> is_third_byte = prev2 >= uint8_t(0b11100000u);
simd8<bool> is_fourth_byte = prev3 >= uint8_t(0b11110000u);
// Use ^ instead of | for is_*_byte, because ^ is commutative, and the caller is using ^ as well.
// This will work fine because we only have to report errors for cases with 0-1 lead bytes.
// Multiple lead bytes implies 2 overlapping multibyte characters, and if that happens, there is
// guaranteed to be at least *one* lead byte that is part of only 1 other multibyte character.
// The error will be detected there.
return is_second_byte ^ is_third_byte ^ is_fourth_byte;
}
really_inline simd8<bool> must_be_2_3_continuation(simd8<uint8_t> prev2, simd8<uint8_t> prev3) {
simd8<bool> is_third_byte = prev2 >= uint8_t(0b11100000u);
simd8<bool> is_fourth_byte = prev3 >= uint8_t(0b11110000u);
return is_third_byte ^ is_fourth_byte;
}
/* begin file src/generic/stage1/buf_block_reader.h */
// Walks through a buffer in block-sized increments, loading the last part with spaces
template<size_t STEP_SIZE>
struct buf_block_reader {
public:
really_inline buf_block_reader(const uint8_t *_buf, size_t _len);
really_inline size_t block_index();
really_inline bool has_full_block() const;
really_inline const uint8_t *full_block() const;
/**
* Get the last block, padded with spaces.
*
* There will always be a last block, with at least 1 byte, unless len == 0 (in which case this
* function fills the buffer with spaces and returns 0. In particular, if len == STEP_SIZE there
* will be 0 full_blocks and 1 remainder block with STEP_SIZE bytes and no spaces for padding.
*
* @return the number of effective characters in the last block.
*/
really_inline size_t get_remainder(uint8_t *dst) const;
really_inline void advance();
private:
const uint8_t *buf;
const size_t len;
const size_t lenminusstep;
size_t idx;
};
// Routines to print masks and text for debugging bitmask operations
UNUSED static char * format_input_text_64(const uint8_t *text) {
static char *buf = (char*)malloc(sizeof(simd8x64<uint8_t>) + 1);
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
buf[i] = int8_t(text[i]) < ' ' ? '_' : int8_t(text[i]);
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
// Routines to print masks and text for debugging bitmask operations
UNUSED static char * format_input_text(const simd8x64<uint8_t> in) {
static char *buf = (char*)malloc(sizeof(simd8x64<uint8_t>) + 1);
in.store((uint8_t*)buf);
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] < ' ') { buf[i] = '_'; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
UNUSED static char * format_mask(uint64_t mask) {
static char *buf = (char*)malloc(64 + 1);
for (size_t i=0; i<64; i++) {
buf[i] = (mask & (size_t(1) << i)) ? 'X' : ' ';
}
buf[64] = '\0';
return buf;
}
template<size_t STEP_SIZE>
really_inline buf_block_reader<STEP_SIZE>::buf_block_reader(const uint8_t *_buf, size_t _len) : buf{_buf}, len{_len}, lenminusstep{len < STEP_SIZE ? 0 : len - STEP_SIZE}, idx{0} {}
template<size_t STEP_SIZE>
really_inline size_t buf_block_reader<STEP_SIZE>::block_index() { return idx; }
template<size_t STEP_SIZE>
really_inline bool buf_block_reader<STEP_SIZE>::has_full_block() const {
return idx < lenminusstep;
}
template<size_t STEP_SIZE>
really_inline const uint8_t *buf_block_reader<STEP_SIZE>::full_block() const {
return &buf[idx];
}
template<size_t STEP_SIZE>
really_inline size_t buf_block_reader<STEP_SIZE>::get_remainder(uint8_t *dst) const {
memset(dst, 0x20, STEP_SIZE); // memset STEP_SIZE because it's more efficient to write out 8 or 16 bytes at once.
memcpy(dst, buf + idx, len - idx);
return len - idx;
}
template<size_t STEP_SIZE>
really_inline void buf_block_reader<STEP_SIZE>::advance() {
idx += STEP_SIZE;
}
/* end file src/generic/stage1/buf_block_reader.h */
/* begin file src/generic/stage1/json_string_scanner.h */
namespace stage1 {
struct json_string_block {
// Escaped characters (characters following an escape() character)
really_inline uint64_t escaped() const { return _escaped; }
// Escape characters (backslashes that are not escaped--i.e. in \\, includes only the first \)
really_inline uint64_t escape() const { return _backslash & ~_escaped; }
// Real (non-backslashed) quotes
really_inline uint64_t quote() const { return _quote; }
// Start quotes of strings
really_inline uint64_t string_end() const { return _quote & _in_string; }
// End quotes of strings
really_inline uint64_t string_start() const { return _quote & ~_in_string; }
// Only characters inside the string (not including the quotes)
really_inline uint64_t string_content() const { return _in_string & ~_quote; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
really_inline uint64_t non_quote_inside_string(uint64_t mask) const { return mask & _in_string; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
really_inline uint64_t non_quote_outside_string(uint64_t mask) const { return mask & ~_in_string; }
// Tail of string (everything except the start quote)
really_inline uint64_t string_tail() const { return _in_string ^ _quote; }
// backslash characters
uint64_t _backslash;
// escaped characters (backslashed--does not include the hex characters after \u)
uint64_t _escaped;
// real quotes (non-backslashed ones)
uint64_t _quote;
// string characters (includes start quote but not end quote)
uint64_t _in_string;
};
// Scans blocks for string characters, storing the state necessary to do so
class json_string_scanner {
public:
really_inline json_string_block next(const simd::simd8x64<uint8_t> in);
really_inline error_code finish(bool streaming);
private:
// Intended to be defined by the implementation
really_inline uint64_t find_escaped(uint64_t escape);
really_inline uint64_t find_escaped_branchless(uint64_t escape);
// Whether the last iteration was still inside a string (all 1's = true, all 0's = false).
uint64_t prev_in_string = 0ULL;
// Whether the first character of the next iteration is escaped.
uint64_t prev_escaped = 0ULL;
};
//
// Finds escaped characters (characters following \).
//
// Handles runs of backslashes like \\\" and \\\\" correctly (yielding 0101 and 01010, respectively).
//
// Does this by:
// - Shift the escape mask to get potentially escaped characters (characters after backslashes).
// - Mask escaped sequences that start on *even* bits with 1010101010 (odd bits are escaped, even bits are not)
// - Mask escaped sequences that start on *odd* bits with 0101010101 (even bits are escaped, odd bits are not)
//
// To distinguish between escaped sequences starting on even/odd bits, it finds the start of all
// escape sequences, filters out the ones that start on even bits, and adds that to the mask of
// escape sequences. This causes the addition to clear out the sequences starting on odd bits (since
// the start bit causes a carry), and leaves even-bit sequences alone.
//
// Example:
//
// text | \\\ | \\\"\\\" \\\" \\"\\" |
// escape | xxx | xx xxx xxx xx xx | Removed overflow backslash; will | it into follows_escape
// odd_starts | x | x x x | escape & ~even_bits & ~follows_escape
// even_seq | c| cxxx c xx c | c = carry bit -- will be masked out later
// invert_mask | | cxxx c xx c| even_seq << 1
// follows_escape | xx | x xx xxx xxx xx xx | Includes overflow bit
// escaped | x | x x x x x x x x |
// desired | x | x x x x x x x x |
// text | \\\ | \\\"\\\" \\\" \\"\\" |
//
really_inline uint64_t json_string_scanner::find_escaped_branchless(uint64_t backslash) {
// If there was overflow, pretend the first character isn't a backslash
backslash &= ~prev_escaped;
uint64_t follows_escape = backslash << 1 | prev_escaped;
// Get sequences starting on even bits by clearing out the odd series using +
const uint64_t even_bits = 0x5555555555555555ULL;
uint64_t odd_sequence_starts = backslash & ~even_bits & ~follows_escape;
uint64_t sequences_starting_on_even_bits;
prev_escaped = add_overflow(odd_sequence_starts, backslash, &sequences_starting_on_even_bits);
uint64_t invert_mask = sequences_starting_on_even_bits << 1; // The mask we want to return is the *escaped* bits, not escapes.
// Mask every other backslashed character as an escaped character
// Flip the mask for sequences that start on even bits, to correct them
return (even_bits ^ invert_mask) & follows_escape;
}
//
// Return a mask of all string characters plus end quotes.
//
// prev_escaped is overflow saying whether the next character is escaped.
// prev_in_string is overflow saying whether we're still in a string.
//
// Backslash sequences outside of quotes will be detected in stage 2.
//
really_inline json_string_block json_string_scanner::next(const simd::simd8x64<uint8_t> in) {
const uint64_t backslash = in.eq('\\');
const uint64_t escaped = find_escaped(backslash);
const uint64_t quote = in.eq('"') & ~escaped;
//
// prefix_xor flips on bits inside the string (and flips off the end quote).
//
// Then we xor with prev_in_string: if we were in a string already, its effect is flipped
// (characters inside strings are outside, and characters outside strings are inside).
//
const uint64_t in_string = prefix_xor(quote) ^ prev_in_string;
//
// Check if we're still in a string at the end of the box so the next block will know
//
// right shift of a signed value expected to be well-defined and standard
// compliant as of C++20, John Regher from Utah U. says this is fine code
//
prev_in_string = uint64_t(static_cast<int64_t>(in_string) >> 63);
// Use ^ to turn the beginning quote off, and the end quote on.
return {
backslash,
escaped,
quote,
in_string
};
}
really_inline error_code json_string_scanner::finish(bool streaming) {
if (prev_in_string and (not streaming)) {
return UNCLOSED_STRING;
}
return SUCCESS;
}
} // namespace stage1
/* end file src/generic/stage1/json_string_scanner.h */
/* begin file src/generic/stage1/json_scanner.h */
namespace stage1 {
/**
* A block of scanned json, with information on operators and scalars.
*/
struct json_block {
public:
/** The start of structurals */
really_inline uint64_t structural_start() { return potential_structural_start() & ~_string.string_tail(); }
/** All JSON whitespace (i.e. not in a string) */
really_inline uint64_t whitespace() { return non_quote_outside_string(_characters.whitespace()); }
// Helpers
/** Whether the given characters are inside a string (only works on non-quotes) */
really_inline uint64_t non_quote_inside_string(uint64_t mask) { return _string.non_quote_inside_string(mask); }
/** Whether the given characters are outside a string (only works on non-quotes) */
really_inline uint64_t non_quote_outside_string(uint64_t mask) { return _string.non_quote_outside_string(mask); }
// string and escape characters
json_string_block _string;
// whitespace, operators, scalars
json_character_block _characters;
// whether the previous character was a scalar
uint64_t _follows_potential_scalar;
private:
// Potential structurals (i.e. disregarding strings)
/** operators plus scalar starts like 123, true and "abc" */
really_inline uint64_t potential_structural_start() { return _characters.op() | potential_scalar_start(); }
/** the start of non-operator runs, like 123, true and "abc" */
really_inline uint64_t potential_scalar_start() { return _characters.scalar() & ~follows_potential_scalar(); }
/** whether the given character is immediately after a non-operator like 123, true or " */
really_inline uint64_t follows_potential_scalar() { return _follows_potential_scalar; }
};
/**
* Scans JSON for important bits: operators, strings, and scalars.
*
* The scanner starts by calculating two distinct things:
* - string characters (taking \" into account)
* - operators ([]{},:) and scalars (runs of non-operators like 123, true and "abc")
*
* To minimize data dependency (a key component of the scanner's speed), it finds these in parallel:
* in particular, the operator/scalar bit will find plenty of things that are actually part of
* strings. When we're done, json_block will fuse the two together by masking out tokens that are
* part of a string.
*/
class json_scanner {
public:
json_scanner() {}
really_inline json_block next(const simd::simd8x64<uint8_t> in);
really_inline error_code finish(bool streaming);
private:
// Whether the last character of the previous iteration is part of a scalar token
// (anything except whitespace or an operator).
uint64_t prev_scalar = 0ULL;
json_string_scanner string_scanner{};
};
//
// Check if the current character immediately follows a matching character.
//
// For example, this checks for quotes with backslashes in front of them:
//
// const uint64_t backslashed_quote = in.eq('"') & immediately_follows(in.eq('\'), prev_backslash);
//
really_inline uint64_t follows(const uint64_t match, uint64_t &overflow) {
const uint64_t result = match << 1 | overflow;
overflow = match >> 63;
return result;
}
//
// Check if the current character follows a matching character, with possible "filler" between.
// For example, this checks for empty curly braces, e.g.
//
// in.eq('}') & follows(in.eq('['), in.eq(' '), prev_empty_array) // { <whitespace>* }
//
really_inline uint64_t follows(const uint64_t match, const uint64_t filler, uint64_t &overflow) {
uint64_t follows_match = follows(match, overflow);
uint64_t result;
overflow |= uint64_t(add_overflow(follows_match, filler, &result));
return result;
}
really_inline json_block json_scanner::next(const simd::simd8x64<uint8_t> in) {
json_string_block strings = string_scanner.next(in);
json_character_block characters = json_character_block::classify(in);
uint64_t follows_scalar = follows(characters.scalar(), prev_scalar);
return {
strings,
characters,
follows_scalar
};
}
really_inline error_code json_scanner::finish(bool streaming) {
return string_scanner.finish(streaming);
}
} // namespace stage1
/* end file src/generic/stage1/json_scanner.h */
namespace stage1 {
really_inline uint64_t json_string_scanner::find_escaped(uint64_t backslash) {
// On ARM, we don't short-circuit this if there are no backslashes, because the branch gives us no
// benefit and therefore makes things worse.
// if (!backslash) { uint64_t escaped = prev_escaped; prev_escaped = 0; return escaped; }
return find_escaped_branchless(backslash);
}
}
/* begin file src/generic/stage1/json_minifier.h */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace stage1 {
class json_minifier {
public:
template<size_t STEP_SIZE>
static error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept;
private:
really_inline json_minifier(uint8_t *_dst)
: dst{_dst}
{}
template<size_t STEP_SIZE>
really_inline void step(const uint8_t *block_buf, buf_block_reader<STEP_SIZE> &reader) noexcept;
really_inline void next(simd::simd8x64<uint8_t> in, json_block block);
really_inline error_code finish(uint8_t *dst_start, size_t &dst_len);
json_scanner scanner{};
uint8_t *dst;
};
really_inline void json_minifier::next(simd::simd8x64<uint8_t> in, json_block block) {
uint64_t mask = block.whitespace();
in.compress(mask, dst);
dst += 64 - count_ones(mask);
}
really_inline error_code json_minifier::finish(uint8_t *dst_start, size_t &dst_len) {
*dst = '\0';
error_code error = scanner.finish(false);
if (error) { dst_len = 0; return error; }
dst_len = dst - dst_start;
return SUCCESS;
}
template<>
really_inline void json_minifier::step<128>(const uint8_t *block_buf, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
simd::simd8x64<uint8_t> in_2(block_buf+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1);
this->next(in_2, block_2);
reader.advance();
}
template<>
really_inline void json_minifier::step<64>(const uint8_t *block_buf, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
json_block block_1 = scanner.next(in_1);
this->next(block_buf, block_1);
reader.advance();
}
template<size_t STEP_SIZE>
error_code json_minifier::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept {
buf_block_reader<STEP_SIZE> reader(buf, len);
json_minifier minifier(dst);
// Index the first n-1 blocks
while (reader.has_full_block()) {
minifier.step<STEP_SIZE>(reader.full_block(), reader);
}
// Index the last (remainder) block, padded with spaces
uint8_t block[STEP_SIZE];
if (likely(reader.get_remainder(block)) > 0) {
minifier.step<STEP_SIZE>(block, reader);
}
return minifier.finish(dst, dst_len);
}
} // namespace stage1
/* end file src/generic/stage1/json_minifier.h */
WARN_UNUSED error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
return arm64::stage1::json_minifier::minify<64>(buf, len, dst, dst_len);
}
/* begin file src/generic/stage1/find_next_document_index.h */
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ';' ','
* and when the second element is NOT one of these characters: '}' '}' ';' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
really_inline static uint32_t find_next_document_index(dom_parser_implementation &parser) {
// TODO don't count separately, just figure out depth
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
return 0;
}
// Skip the last character if it is partial
really_inline static size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0b11100000) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0b11100000) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0b11110000) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
/* end file src/generic/stage1/find_next_document_index.h */
/* begin file src/generic/stage1/utf8_lookup3_algorithm.h */
//
// Detect Unicode errors.
//
// UTF-8 is designed to allow multiple bytes and be compatible with ASCII. It's a fairly basic
// encoding that uses the first few bits on each byte to denote a "byte type", and all other bits
// are straight up concatenated into the final value. The first byte of a multibyte character is a
// "leading byte" and starts with N 1's, where N is the total number of bytes (110_____ = 2 byte
// lead). The remaining bytes of a multibyte character all start with 10. 1-byte characters just
// start with 0, because that's what ASCII looks like. Here's what each size looks like:
//
// - ASCII (7 bits): 0_______
// - 2 byte character (11 bits): 110_____ 10______
// - 3 byte character (17 bits): 1110____ 10______ 10______
// - 4 byte character (23 bits): 11110___ 10______ 10______ 10______
// - 5+ byte character (illegal): 11111___ <illegal>
//
// There are 5 classes of error that can happen in Unicode:
//
// - TOO_SHORT: when you have a multibyte character with too few bytes (i.e. missing continuation).
// We detect this by looking for new characters (lead bytes) inside the range of a multibyte
// character.
//
// e.g. 11000000 01100001 (2-byte character where second byte is ASCII)
//
// - TOO_LONG: when there are more bytes in your character than you need (i.e. extra continuation).
// We detect this by requiring that the next byte after your multibyte character be a new
// character--so a continuation after your character is wrong.
//
// e.g. 11011111 10111111 10111111 (2-byte character followed by *another* continuation byte)
//
// - TOO_LARGE: Unicode only goes up to U+10FFFF. These characters are too large.
//
// e.g. 11110111 10111111 10111111 10111111 (bigger than 10FFFF).
//
// - OVERLONG: multibyte characters with a bunch of leading zeroes, where you could have
// used fewer bytes to make the same character. Like encoding an ASCII character in 4 bytes is
// technically possible, but UTF-8 disallows it so that there is only one way to write an "a".
//
// e.g. 11000001 10100001 (2-byte encoding of "a", which only requires 1 byte: 01100001)
//
// - SURROGATE: Unicode U+D800-U+DFFF is a *surrogate* character, reserved for use in UCS-2 and
// WTF-8 encodings for characters with > 2 bytes. These are illegal in pure UTF-8.
//
// e.g. 11101101 10100000 10000000 (U+D800)
//
// - INVALID_5_BYTE: 5-byte, 6-byte, 7-byte and 8-byte characters are unsupported; Unicode does not
// support values with more than 23 bits (which a 4-byte character supports).
//
// e.g. 11111000 10100000 10000000 10000000 10000000 (U+800000)
//
// Legal utf-8 byte sequences per http://www.unicode.org/versions/Unicode6.0.0/ch03.pdf - page 94:
//
// Code Points 1st 2s 3s 4s
// U+0000..U+007F 00..7F
// U+0080..U+07FF C2..DF 80..BF
// U+0800..U+0FFF E0 A0..BF 80..BF
// U+1000..U+CFFF E1..EC 80..BF 80..BF
// U+D000..U+D7FF ED 80..9F 80..BF
// U+E000..U+FFFF EE..EF 80..BF 80..BF
// U+10000..U+3FFFF F0 90..BF 80..BF 80..BF
// U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
// U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
//
using namespace simd;
namespace utf8_validation {
// For a detailed description of the lookup2 algorithm, see the file HACKING.md under "UTF-8 validation (lookup2)".
//
// Find special case UTF-8 errors where the character is technically readable (has the right length)
// but the *value* is disallowed.
//
// This includes overlong encodings, surrogates and values too large for Unicode.
//
// It turns out the bad character ranges can all be detected by looking at the first 12 bits of the
// UTF-8 encoded character (i.e. all of byte 1, and the high 4 bits of byte 2). This algorithm does a
// 3 4-bit table lookups, identifying which errors that 4 bits could match, and then &'s them together.
// If all 3 lookups detect the same error, it's an error.
//
really_inline simd8<uint8_t> check_special_cases(const simd8<uint8_t> input, const simd8<uint8_t> prev1) {
//
// These are the errors we're going to match for bytes 1-2, by looking at the first three
// nibbles of the character: <high bits of byte 1>> & <low bits of byte 1> & <high bits of byte 2>
//
static const int OVERLONG_2 = 0x01; // 1100000_ 10______ (technically we match 10______ but we could match ________, they both yield errors either way)
static const int OVERLONG_3 = 0x02; // 11100000 100_____ ________
static const int OVERLONG_4 = 0x04; // 11110000 1000____ ________ ________
static const int SURROGATE = 0x08; // 11101101 [101_]____
static const int TOO_LARGE = 0x10; // 11110100 (1001|101_)____
static const int TOO_LARGE_2 = 0x20; // 1111(1___|011_|0101) 10______
// New with lookup3. We want to catch the case where an non-continuation
// follows a leading byte
static const int TOO_SHORT_2_3_4 = 0x40; // (110_|1110|1111) ____ (0___|110_|1111) ____
// We also want to catch a continuation that is preceded by an ASCII byte
static const int LONELY_CONTINUATION = 0x80; // 0___ ____ 01__ ____
// After processing the rest of byte 1 (the low bits), we're still not done--we have to check
// byte 2 to be sure which things are errors and which aren't.
// Since high_bits is byte 5, byte 2 is high_bits.prev<3>
static const int CARRY = OVERLONG_2 | TOO_LARGE_2;
const simd8<uint8_t> byte_2_high = input.shr<4>().lookup_16<uint8_t>(
// ASCII: ________ [0___]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
// ASCII: ________ [0___]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
// Continuations: ________ [10__]____
CARRY | OVERLONG_3 | OVERLONG_4 | LONELY_CONTINUATION, // ________ [1000]____
CARRY | OVERLONG_3 | TOO_LARGE | LONELY_CONTINUATION, // ________ [1001]____
CARRY | TOO_LARGE | SURROGATE | LONELY_CONTINUATION, // ________ [1010]____
CARRY | TOO_LARGE | SURROGATE | LONELY_CONTINUATION, // ________ [1011]____
// Multibyte Leads: ________ [11__]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4, // 110_
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4
);
const simd8<uint8_t> byte_1_high = prev1.shr<4>().lookup_16<uint8_t>(
// [0___]____ (ASCII)
LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION,
LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION,
// [10__]____ (continuation)
0, 0, 0, 0,
// [11__]____ (2+-byte leads)
OVERLONG_2 | TOO_SHORT_2_3_4, TOO_SHORT_2_3_4, // [110_]____ (2-byte lead)
OVERLONG_3 | SURROGATE | TOO_SHORT_2_3_4, // [1110]____ (3-byte lead)
OVERLONG_4 | TOO_LARGE | TOO_LARGE_2 | TOO_SHORT_2_3_4 // [1111]____ (4+-byte lead)
);
const simd8<uint8_t> byte_1_low = (prev1 & 0x0F).lookup_16<uint8_t>(
// ____[00__] ________
OVERLONG_2 | OVERLONG_3 | OVERLONG_4 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0000] ________
OVERLONG_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0001] ________
TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[01__] ________
TOO_LARGE | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0100] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[10__] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[11__] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | SURROGATE | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[1101] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4| LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION
);
return byte_1_high & byte_1_low & byte_2_high;
}
really_inline simd8<uint8_t> check_multibyte_lengths(simd8<uint8_t> input, simd8<uint8_t> prev_input,
simd8<uint8_t> prev1) {
simd8<uint8_t> prev2 = input.prev<2>(prev_input);
simd8<uint8_t> prev3 = input.prev<3>(prev_input);
// is_2_3_continuation uses one more instruction than lookup2
simd8<bool> is_2_3_continuation = (simd8<int8_t>(input).max(simd8<int8_t>(prev1))) < int8_t(-64);
// must_be_2_3_continuation has two fewer instructions than lookup 2
return simd8<uint8_t>(must_be_2_3_continuation(prev2, prev3) ^ is_2_3_continuation);
}
//
// Return nonzero if there are incomplete multibyte characters at the end of the block:
// e.g. if there is a 4-byte character, but it's 3 bytes from the end.
//
really_inline simd8<uint8_t> is_incomplete(simd8<uint8_t> input) {
// If the previous input's last 3 bytes match this, they're too short (they ended at EOF):
// ... 1111____ 111_____ 11______
static const uint8_t max_array[32] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0b11110000u-1, 0b11100000u-1, 0b11000000u-1
};
const simd8<uint8_t> max_value(&max_array[sizeof(max_array)-sizeof(simd8<uint8_t>)]);
return input.gt_bits(max_value);
}
struct utf8_checker {
// If this is nonzero, there has been a UTF-8 error.
simd8<uint8_t> error;
// The last input we received
simd8<uint8_t> prev_input_block;
// Whether the last input we received was incomplete (used for ASCII fast path)
simd8<uint8_t> prev_incomplete;
//
// Check whether the current bytes are valid UTF-8.
//
really_inline void check_utf8_bytes(const simd8<uint8_t> input, const simd8<uint8_t> prev_input) {
// Flip prev1...prev3 so we can easily determine if they are 2+, 3+ or 4+ lead bytes
// (2, 3, 4-byte leads become large positive numbers instead of small negative numbers)
simd8<uint8_t> prev1 = input.prev<1>(prev_input);
this->error |= check_special_cases(input, prev1);
this->error |= check_multibyte_lengths(input, prev_input, prev1);
}
// The only problem that can happen at EOF is that a multibyte character is too short.
really_inline void check_eof() {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
}
really_inline void check_next_input(simd8x64<uint8_t> input) {
if (likely(is_ascii(input))) {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
} else {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
for (int i=1; i<simd8x64<uint8_t>::NUM_CHUNKS; i++) {
this->check_utf8_bytes(input.chunks[i], input.chunks[i-1]);
}
this->prev_incomplete = is_incomplete(input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1]);
this->prev_input_block = input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1];
}
}
really_inline error_code errors() {
return this->error.any_bits_set_anywhere() ? simdjson::UTF8_ERROR : simdjson::SUCCESS;
}
}; // struct utf8_checker
}
using utf8_validation::utf8_checker;
/* end file src/generic/stage1/utf8_lookup3_algorithm.h */
/* begin file src/generic/stage1/json_structural_indexer.h */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace stage1 {
class bit_indexer {
public:
uint32_t *tail;
really_inline bit_indexer(uint32_t *index_buf) : tail(index_buf) {}
// flatten out values in 'bits' assuming that they are are to have values of idx
// plus their position in the bitvector, and store these indexes at
// base_ptr[base] incrementing base as we go
// will potentially store extra values beyond end of valid bits, so base_ptr
// needs to be large enough to handle this
really_inline void write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0)
return;
int cnt = static_cast<int>(count_ones(bits));
// Do the first 8 all together
for (int i=0; i<8; i++) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
// Do the next 8 all together (we hope in most cases it won't happen at all
// and the branch is easily predicted).
if (unlikely(cnt > 8)) {
for (int i=8; i<16; i++) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
// Most files don't have 16+ structurals per block, so we take several basically guaranteed
// branch mispredictions here. 16+ structurals per block means either punctuation ({} [] , :)
// or the start of a value ("abc" true 123) every four characters.
if (unlikely(cnt > 16)) {
int i = 16;
do {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
i++;
} while (i < cnt);
}
}
this->tail += cnt;
}
};
class json_structural_indexer {
public:
/**
* Find the important bits of JSON in a 128-byte chunk, and add them to structural_indexes.
*
* @param partial Setting the partial parameter to true allows the find_structural_bits to
* tolerate unclosed strings. The caller should still ensure that the input is valid UTF-8. If
* you are processing substrings, you may want to call on a function like trimmed_length_safe_utf8.
*/
template<size_t STEP_SIZE>
static error_code index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, bool partial) noexcept;
private:
really_inline json_structural_indexer(uint32_t *structural_indexes);
template<size_t STEP_SIZE>
really_inline void step(const uint8_t *block, buf_block_reader<STEP_SIZE> &reader) noexcept;
really_inline void next(simd::simd8x64<uint8_t> in, json_block block, size_t idx);
really_inline error_code finish(dom_parser_implementation &parser, size_t idx, size_t len, bool partial);
json_scanner scanner{};
utf8_checker checker{};
bit_indexer indexer;
uint64_t prev_structurals = 0;
uint64_t unescaped_chars_error = 0;
};
really_inline json_structural_indexer::json_structural_indexer(uint32_t *structural_indexes) : indexer{structural_indexes} {}
//
// PERF NOTES:
// We pipe 2 inputs through these stages:
// 1. Load JSON into registers. This takes a long time and is highly parallelizable, so we load
// 2 inputs' worth at once so that by the time step 2 is looking for them input, it's available.
// 2. Scan the JSON for critical data: strings, scalars and operators. This is the critical path.
// The output of step 1 depends entirely on this information. These functions don't quite use
// up enough CPU: the second half of the functions is highly serial, only using 1 execution core
// at a time. The second input's scans has some dependency on the first ones finishing it, but
// they can make a lot of progress before they need that information.
// 3. Step 1 doesn't use enough capacity, so we run some extra stuff while we're waiting for that
// to finish: utf-8 checks and generating the output from the last iteration.
//
// The reason we run 2 inputs at a time, is steps 2 and 3 are *still* not enough to soak up all
// available capacity with just one input. Running 2 at a time seems to give the CPU a good enough
// workout.
//
template<size_t STEP_SIZE>
error_code json_structural_indexer::index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, bool partial) noexcept {
if (unlikely(len > parser.capacity())) { return CAPACITY; }
if (partial) { len = trim_partial_utf8(buf, len); }
buf_block_reader<STEP_SIZE> reader(buf, len);
json_structural_indexer indexer(parser.structural_indexes.get());
// Read all but the last block
while (reader.has_full_block()) {
indexer.step<STEP_SIZE>(reader.full_block(), reader);
}
// Take care of the last block (will always be there unless file is empty)
uint8_t block[STEP_SIZE];
if (unlikely(reader.get_remainder(block) == 0)) { return EMPTY; }
indexer.step<STEP_SIZE>(block, reader);
return indexer.finish(parser, reader.block_index(), len, partial);
}
template<>
really_inline void json_structural_indexer::step<128>(const uint8_t *block, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
simd::simd8x64<uint8_t> in_2(block+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1, reader.block_index());
this->next(in_2, block_2, reader.block_index()+64);
reader.advance();
}
template<>
really_inline void json_structural_indexer::step<64>(const uint8_t *block, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
json_block block_1 = scanner.next(in_1);
this->next(in_1, block_1, reader.block_index());
reader.advance();
}
really_inline void json_structural_indexer::next(simd::simd8x64<uint8_t> in, json_block block, size_t idx) {
uint64_t unescaped = in.lteq(0x1F);
checker.check_next_input(in);
indexer.write(uint32_t(idx-64), prev_structurals); // Output *last* iteration's structurals to the parser
prev_structurals = block.structural_start();
unescaped_chars_error |= block.non_quote_inside_string(unescaped);
}
really_inline error_code json_structural_indexer::finish(dom_parser_implementation &parser, size_t idx, size_t len, bool partial) {
// Write out the final iteration's structurals
indexer.write(uint32_t(idx-64), prev_structurals);
error_code error = scanner.finish(partial);
if (unlikely(error != SUCCESS)) { return error; }
if (unescaped_chars_error) {
return UNESCAPED_CHARS;
}
parser.n_structural_indexes = uint32_t(indexer.tail - parser.structural_indexes.get());
/***
* This is related to https://github.com/simdjson/simdjson/issues/906
* Basically, we want to make sure that if the parsing continues beyond the last (valid)
* structural character, it quickly stops.
* Only three structural characters can be repeated without triggering an error in JSON: [,] and }.
* We repeat the padding character (at 'len'). We don't know what it is, but if the parsing
* continues, then it must be [,] or }.
* Suppose it is ] or }. We backtrack to the first character, what could it be that would
* not trigger an error? It could be ] or } but no, because you can't start a document that way.
* It can't be a comma, a colon or any simple value. So the only way we could continue is
* if the repeated character is [. But if so, the document must start with [. But if the document
* starts with [, it should end with ]. If we enforce that rule, then we would get
* ][[ which is invalid.
**/
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 1] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 2] = 0;
parser.next_structural_index = 0;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (unlikely(parser.n_structural_indexes == 0u)) {
return EMPTY;
}
if (unlikely(parser.structural_indexes[parser.n_structural_indexes - 1] > len)) {
return UNEXPECTED_ERROR;
}
if (partial) {
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
return CAPACITY; // If the buffer is partial but the document is incomplete, it's too big to parse.
}
parser.n_structural_indexes = new_structural_indexes;
}
return checker.errors();
}
} // namespace stage1
/* end file src/generic/stage1/json_structural_indexer.h */
WARN_UNUSED error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, bool streaming) noexcept {
this->buf = _buf;
this->len = _len;
return arm64::stage1::json_structural_indexer::index<64>(buf, len, *this, streaming);
}
/* begin file src/generic/stage1/utf8_validator.h */
namespace stage1 {
/**
* Validates that the string is actual UTF-8.
*/
template<class checker>
bool generic_validate_utf8(const uint8_t * input, size_t length) {
checker c{};
buf_block_reader<64> reader(input, length);
while (reader.has_full_block()) {
simd::simd8x64<uint8_t> in(reader.full_block());
c.check_next_input(in);
reader.advance();
}
uint8_t block[64]{};
reader.get_remainder(block);
simd::simd8x64<uint8_t> in(block);
c.check_next_input(in);
reader.advance();
return c.errors() == error_code::SUCCESS;
}
bool generic_validate_utf8(const char * input, size_t length) {
return generic_validate_utf8<utf8_checker>((const uint8_t *)input,length);
}
} // namespace stage1
/* end file src/generic/stage1/utf8_validator.h */
WARN_UNUSED bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
return simdjson::arm64::stage1::generic_validate_utf8(buf,len);
}
} // namespace arm64
} // namespace simdjson
//
// Stage 2
//
/* begin file src/arm64/stringparsing.h */
#ifndef SIMDJSON_ARM64_STRINGPARSING_H
#define SIMDJSON_ARM64_STRINGPARSING_H
/* jsoncharutils.h already included: #include "jsoncharutils.h" */
/* arm64/simd.h already included: #include "arm64/simd.h" */
/* arm64/intrinsics.h already included: #include "arm64/intrinsics.h" */
/* arm64/bitmanipulation.h already included: #include "arm64/bitmanipulation.h" */
namespace simdjson {
namespace arm64 {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
really_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
really_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
really_inline bool has_backslash() { return bs_bits != 0; }
really_inline int quote_index() { return trailing_zeroes(quote_bits); }
really_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 31 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v0(src);
simd8<uint8_t> v1(src + sizeof(v0));
v0.store(dst);
v1.store(dst + sizeof(v0));
// Getting a 64-bit bitmask is much cheaper than multiple 16-bit bitmasks on ARM; therefore, we
// smash them together into a 64-byte mask and get the bitmask from there.
uint64_t bs_and_quote = simd8x64<bool>(v0 == '\\', v1 == '\\', v0 == '"', v1 == '"').to_bitmask();
return {
uint32_t(bs_and_quote), // bs_bits
uint32_t(bs_and_quote >> 32) // quote_bits
};
}
/* begin file src/generic/stage2/stringparsing.h */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is include already includes
// "stringparsing.h" (this simplifies amalgation)
namespace stage2 {
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
WARN_UNUSED
really_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion isn't valid; we defer the check for this to inside the
// multilingual plane check
uint32_t code_point = hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// check for low surrogate for characters outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
if (((*src_ptr)[0] != '\\') || (*src_ptr)[1] != 'u') {
return false;
}
uint32_t code_point_2 = hex_to_u32_nocheck(*src_ptr + 2);
// if the first code point is invalid we will get here, as we will go past
// the check for being outside the Basic Multilingual plane. If we don't
// find a \u immediately afterwards we fail out anyhow, but if we do,
// this check catches both the case of the first code point being invalid
// or the second code point being invalid.
if ((code_point | code_point_2) >> 16) {
return false;
}
code_point =
(((code_point - 0xd800) << 10) | (code_point_2 - 0xdc00)) + 0x10000;
*src_ptr += 6;
}
size_t offset = codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
WARN_UNUSED really_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst) {
src++;
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
/* can't be reached */
return nullptr;
}
} // namespace stringparsing
} // namespace stage2
/* end file src/generic/stage2/stringparsing.h */
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_STRINGPARSING_H
/* end file src/generic/stage2/stringparsing.h */
/* begin file src/arm64/numberparsing.h */
#ifndef SIMDJSON_ARM64_NUMBERPARSING_H
#define SIMDJSON_ARM64_NUMBERPARSING_H
/* jsoncharutils.h already included: #include "jsoncharutils.h" */
/* arm64/intrinsics.h already included: #include "arm64/intrinsics.h" */
/* arm64/bitmanipulation.h already included: #include "arm64/bitmanipulation.h" */
#include <cmath>
#include <limits>
#ifdef JSON_TEST_NUMBERS // for unit testing
void found_invalid_number(const uint8_t *buf);
void found_integer(int64_t result, const uint8_t *buf);
void found_unsigned_integer(uint64_t result, const uint8_t *buf);
void found_float(double result, const uint8_t *buf);
#endif
namespace simdjson {
namespace arm64 {
// we don't have SSE, so let us use a scalar function
// credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
uint64_t val;
memcpy(&val, chars, sizeof(uint64_t));
val = (val & 0x0F0F0F0F0F0F0F0F) * 2561 >> 8;
val = (val & 0x00FF00FF00FF00FF) * 6553601 >> 16;
return uint32_t((val & 0x0000FFFF0000FFFF) * 42949672960001 >> 32);
}
#define SWAR_NUMBER_PARSING
/* begin file src/generic/stage2/numberparsing.h */
namespace stage2 {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), false)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), writer.append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), writer.append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), writer.append_double((VALUE)))
#else
#define INVALID_NUMBER(SRC) (false)
#define WRITE_INTEGER(VALUE, SRC, WRITER) writer.append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) writer.append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) writer.append_double((VALUE))
#endif
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [FASTFLOAT_SMALLEST_POWER,
// FASTFLOAT_LARGEST_POWER] interval: the caller is responsible for this check.
really_inline double compute_float_64(int64_t power, uint64_t i, bool negative, bool *success) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991) {
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991) {
#endif
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
double d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / power_of_ten[-power];
} else {
d = d * power_of_ten[power];
}
if (negative) {
d = -d;
}
*success = true;
return d;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It wa
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
return 0.0;
}
// We are going to need to do some 64-bit arithmetic to get a more precise product.
// We use a table lookup approach.
components c =
power_of_ten_components[power - FASTFLOAT_SMALLEST_POWER];
// safe because
// power >= FASTFLOAT_SMALLEST_POWER
// and power <= FASTFLOAT_LARGEST_POWER
// we recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
uint64_t factor_mantissa = c.mantissa;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
value128 product = full_multiplication(i, factor_mantissa);
uint64_t lower = product.low;
uint64_t upper = product.high;
// We know that upper has at most one leading zero because
// both i and factor_mantissa have a leading one. This means
// that the result is at least as large as ((1<<63)*(1<<63))/(1<<64).
// As long as the first 9 bits of "upper" are not "1", then we
// know that we have an exact computed value for the leading
// 55 bits because any imprecision would play out as a +1, in
// the worst case.
if (unlikely((upper & 0x1FF) == 0x1FF) && (lower + i < lower)) {
uint64_t factor_mantissa_low =
mantissa_128[power - FASTFLOAT_SMALLEST_POWER];
// next, we compute the 64-bit x 128-bit multiplication, getting a 192-bit
// result (three 64-bit values)
product = full_multiplication(i, factor_mantissa_low);
uint64_t product_low = product.low;
uint64_t product_middle2 = product.high;
uint64_t product_middle1 = lower;
uint64_t product_high = upper;
uint64_t product_middle = product_middle1 + product_middle2;
if (product_middle < product_middle1) {
product_high++; // overflow carry
}
// We want to check whether mantissa *i + i would affect our result.
// This does happen, e.g. with 7.3177701707893310e+15.
if (((product_middle + 1 == 0) && ((product_high & 0x1FF) == 0x1FF) &&
(product_low + i < product_low))) { // let us be prudent and bail out.
*success = false;
return 0;
}
upper = product_high;
lower = product_middle;
}
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
if (unlikely((lower == 0) && ((upper & 0x1FF) == 0) &&
((mantissa & 3) == 1))) {
// if mantissa & 1 == 1 we might need to round up.
//
// Scenarios:
// 1. We are not in the middle. Then we should round up.
//
// 2. We are right in the middle. Whether we round up depends
// on the last significant bit: if it is "one" then we round
// up (round to even) otherwise, we do not.
//
// So if the last significant bit is 1, we can safely round up.
// Hence we only need to bail out if (mantissa & 3) == 1.
// Otherwise we may need more accuracy or analysis to determine whether
// we are exactly between two floating-point numbers.
// It can be triggered with 1e23.
// Note: because the factor_mantissa and factor_mantissa_low are
// almost always rounded down (except for small positive powers),
// almost always should round up.
*success = false;
return 0;
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
lz--; // undo previous addition
}
mantissa &= ~(1ULL << 52);
uint64_t real_exponent = c.exp - lz;
// we have to check that real_exponent is in range, otherwise we bail out
if (unlikely((real_exponent < 1) || (real_exponent > 2046))) {
*success = false;
return 0;
}
mantissa |= real_exponent << 52;
mantissa |= (((uint64_t)negative) << 63);
double d;
memcpy(&d, &mantissa, sizeof(d));
*success = true;
return d;
}
static bool parse_float_strtod(const char *ptr, double *outDouble) {
char *endptr;
*outDouble = strtod(ptr, &endptr);
// Some libraries will set errno = ERANGE when the value is subnormal,
// yet we may want to be able to parse subnormal values.
// However, we do not want to tolerate NAN or infinite values.
//
// Values like infinity or NaN are not allowed in the JSON specification.
// If you consume a large value and you map it to "infinity", you will no
// longer be able to serialize back a standard-compliant JSON. And there is
// no realistic application where you might need values so large than they
// can't fit in binary64. The maximal value is about 1.7976931348623157 x
// 10^308 It is an unimaginable large number. There will never be any piece of
// engineering involving as many as 10^308 parts. It is estimated that there
// are about 10^80 atoms in the universe. The estimate for the total number
// of electrons is similar. Using a double-precision floating-point value, we
// can represent easily the number of atoms in the universe. We could also
// represent the number of ways you can pick any three individual atoms at
// random in the universe. If you ever encounter a number much larger than
// 10^308, you know that you have a bug. RapidJSON will reject a document with
// a float that does not fit in binary64. JSON for Modern C++ (nlohmann/json)
// will flat out throw an exception.
//
if ((endptr == ptr) || (!std::isfinite(*outDouble))) {
return false;
}
return true;
}
really_inline bool is_integer(char c) {
return (c >= '0' && c <= '9');
// this gets compiled to (uint8_t)(c - '0') <= 9 on all decent compilers
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
really_inline bool is_made_of_eight_digits_fast(const char *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename W>
bool slow_float_parsing(UNUSED const char * src, W writer) {
double d;
if (parse_float_strtod(src, &d)) {
WRITE_DOUBLE(d, (const uint8_t *)src, writer);
return true;
}
return INVALID_NUMBER((const uint8_t *)src);
}
really_inline bool parse_decimal(UNUSED const uint8_t *const src, const char *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const char *const first_after_period = p;
if (!is_integer(*p)) { return INVALID_NUMBER(src); } // There must be at least one digit after the .
unsigned char digit = static_cast<unsigned char>(*p - '0');
++p;
i = i * 10 + digit; // might overflow + multiplication by 10 is likely
// cheaper than arbitrary mult.
// we will handle the overflow later
#ifdef SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif
while (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
++p;
i = i * 10 + digit; // in rare cases, this will overflow, but that's ok
// because we have parse_highprecision_float later.
}
exponent = first_after_period - p;
return true;
}
really_inline bool parse_exponent(UNUSED const uint8_t *const src, const char *&p, int64_t &exponent) {
bool neg_exp = false;
if ('-' == *p) {
neg_exp = true;
++p;
} else if ('+' == *p) {
++p;
}
// e[+-] must be followed by a number
if (!is_integer(*p)) { return INVALID_NUMBER(src); }
unsigned char digit = static_cast<unsigned char>(*p - '0');
int64_t exp_number = digit;
p++;
if (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
if (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
while (is_integer(*p)) {
// we need to check for overflows; we refuse to parse this
if (exp_number > 0x100000000) { return INVALID_NUMBER(src); }
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
exponent += (neg_exp ? -exp_number : exp_number);
return true;
}
template<typename W>
really_inline bool write_float(const uint8_t *const src, bool negative, uint64_t i, const char * start_digits, int digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
// digit count is off by 1 because of the decimal (assuming there was one).
if (unlikely((digit_count-1 >= 19))) { // this is uncommon
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const char *start = start_digits;
while ((*start == '0') || (*start == '.')) {
start++;
}
// we over-decrement by one when there is a '.'
digit_count -= int(start - start_digits);
if (digit_count >= 19) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
bool success = slow_float_parsing((const char *) src, writer);
// The number was already written, but we made a copy of the writer
// when we passed it to the parse_large_integer() function, so
writer.skip_double();
return success;
}
}
// NOTE: it's weird that the unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (unlikely(exponent < FASTFLOAT_SMALLEST_POWER) || (exponent > FASTFLOAT_LARGEST_POWER)) {
// this is almost never going to get called!!!
// we start anew, going slowly!!!
bool success = slow_float_parsing((const char *) src, writer);
// The number was already written, but we made a copy of the writer when we passed it to the
// slow_float_parsing() function, so we have to skip those tape spots now that we've returned
writer.skip_double();
return success;
}
bool success = true;
double d = compute_float_64(exponent, i, negative, &success);
if (!success) {
// we are almost never going to get here.
if (!parse_float_strtod((const char *)src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return true;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
really_inline bool parse_number(UNUSED const uint8_t *const src,
UNUSED bool found_minus,
W &writer) {
#ifdef SIMDJSON_SKIPNUMBERPARSING // for performance analysis, it is sometimes
// useful to skip parsing
writer.append_s64(0); // always write zero
return true; // always succeeds
#else
const char *p = reinterpret_cast<const char *>(src);
bool negative = false;
if (found_minus) {
++p;
negative = true;
// a negative sign must be followed by an integer
if (!is_integer(*p)) { return INVALID_NUMBER(src); }
}
const char *const start_digits = p;
uint64_t i; // an unsigned int avoids signed overflows (which are bad)
if (*p == '0') {
++p;
if (is_integer(*p)) { return INVALID_NUMBER(src); } // 0 cannot be followed by an integer
i = 0;
} else {
// NOTE: This is a redundant check--either we're negative, in which case we checked whether this
// is a digit above, or the caller already determined we start with a digit. But removing this
// check seems to make things slower: https://github.com/simdjson/simdjson/pull/990#discussion_r448512448
// Please do try yourself, or think of ways to explain it--we'd love to understand :)
if (!is_integer(*p)) { return INVALID_NUMBER(src); } // must start with an integer
unsigned char digit = static_cast<unsigned char>(*p - '0');
i = digit;
p++;
// the is_made_of_eight_digits_fast routine is unlikely to help here because
// we rarely see large integer parts like 123456789
while (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
// a multiplication by 10 is cheaper than an arbitrary integer
// multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
++p;
}
}
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
if (!parse_decimal(src, p, i, exponent)) { return false; }
}
int digit_count = int(p - start_digits); // used later to guard against overflows
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
if (!parse_exponent(src, p, exponent)) { return false; }
}
if (is_float) {
return write_float(src, negative, i, start_digits, digit_count, exponent, writer);
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
int longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return INVALID_NUMBER(src); }
if (digit_count == longest_digit_count) {
// Anything negative above INT64_MAX is either invalid or INT64_MIN.
if (negative && i > uint64_t(INT64_MAX)) {
// If the number is negative and can't fit in a signed integer, it's invalid.
if (i > uint64_t(INT64_MAX)+1) { return INVALID_NUMBER(src); }
// If it's negative, it has to be INT64_MAX+1 now (or INT64_MIN).
// C++ can't reliably negate uint64_t INT64_MIN, it seems. Special case it.
WRITE_INTEGER(INT64_MIN, src, writer);
return is_structural_or_whitespace(*p);
}
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to 9,223,372,036,854,775,808 (INT64_MAX).
//
if (!negative && (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX))) { return INVALID_NUMBER(src); }
}
// Write unsigned if it doesn't fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? 0 - i : i, src, writer);
}
return is_structural_or_whitespace(*p);
#endif // SIMDJSON_SKIPNUMBERPARSING
}
} // namespace numberparsing
} // namespace stage2
/* end file src/generic/stage2/numberparsing.h */
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_NUMBERPARSING_H
/* end file src/generic/stage2/numberparsing.h */
namespace simdjson {
namespace arm64 {
/* begin file src/generic/stage2/logger.h */
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
static constexpr const bool LOG_ENABLED = false;
static constexpr const int LOG_EVENT_LEN = 30;
static constexpr const int LOG_BUFFER_LEN = 20;
static constexpr const int LOG_DETAIL_LEN = 50;
static constexpr const int LOG_INDEX_LEN = 10;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static really_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static really_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %*s | %*s | %*s | %-*s | %-*s | %-*s |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", 4, "Curr", 4, "Next", 5, "Next#", 5, "Tape#", LOG_DETAIL_LEN, "Detail", LOG_INDEX_LEN, "index");
printf("|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, 4+2, DASHES, 4+2, DASHES, 5+2, DASHES, 5+2, DASHES, LOG_DETAIL_LEN+2, DASHES, LOG_INDEX_LEN+2, DASHES);
}
}
static really_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line of
template<typename S>
static really_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(structurals.current()[i]));
}
printf(" ");
}
printf("| %c ", printable_char(structurals.current_char()));
printf("| %c ", printable_char(structurals.peek_next_char()));
printf("| %5u ", structurals.parser.structural_indexes[*(structurals.current_structural+1)]);
printf("| %5u ", structurals.next_tape_index());
printf("| %-*s ", LOG_DETAIL_LEN, detail);
printf("| %*u ", LOG_INDEX_LEN, *structurals.current_structural);
printf("|\n");
}
}
} // namespace logger
/* end file src/generic/stage2/logger.h */
/* begin file src/generic/stage2/atomparsing.h */
namespace stage2 {
namespace atomparsing {
really_inline uint32_t string_to_uint32(const char* str) { return *reinterpret_cast<const uint32_t *>(str); }
WARN_UNUSED
really_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 64-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | is_not_structural_or_whitespace(src[5])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // namespace stage2
/* end file src/generic/stage2/atomparsing.h */
/* begin file src/generic/stage2/structural_iterator.h */
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *current_structural;
dom_parser_implementation &parser;
// Start a structural
really_inline structural_iterator(dom_parser_implementation &_parser, size_t start_structural_index)
: buf{_parser.buf},
current_structural{&_parser.structural_indexes[start_structural_index]},
parser{_parser} {
}
// Get the buffer position of the current structural character
really_inline const uint8_t* current() {
return &buf[*current_structural];
}
// Get the current structural character
really_inline char current_char() {
return buf[*current_structural];
}
// Get the next structural character without advancing
really_inline char peek_next_char() {
return buf[*(current_structural+1)];
}
really_inline char advance_char() {
current_structural++;
return buf[*current_structural];
}
really_inline size_t remaining_len() {
return parser.len - *current_structural;
}
really_inline bool past_end(uint32_t n_structural_indexes) {
return current_structural >= &parser.structural_indexes[n_structural_indexes];
}
really_inline bool at_end(uint32_t n_structural_indexes) {
return current_structural == &parser.structural_indexes[n_structural_indexes];
}
really_inline bool at_beginning() {
return current_structural == parser.structural_indexes.get();
}
};
} // namespace stage2
/* end file src/generic/stage2/structural_iterator.h */
/* begin file src/generic/stage2/structural_parser.h */
// This file contains the common code every implementation uses for stage2
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is include already includes
// "simdjson/stage2.h" (this simplifies amalgation)
namespace stage2 {
namespace { // Make everything here private
/* begin file src/generic/stage2/tape_writer.h */
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
really_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
really_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
really_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
really_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
really_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
really_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
really_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
really_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
really_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct number_writer
really_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
really_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
really_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
really_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
really_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
really_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
really_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
really_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
really_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
/* end file src/generic/stage2/tape_writer.h */
#ifdef SIMDJSON_USE_COMPUTED_GOTO
#define INIT_ADDRESSES() { &&array_begin, &&array_continue, &&error, &&finish, &&object_begin, &&object_continue }
#define GOTO(address) { goto *(address); }
#define CONTINUE(address) { goto *(address); }
#else // SIMDJSON_USE_COMPUTED_GOTO
#define INIT_ADDRESSES() { '[', 'a', 'e', 'f', '{', 'o' };
#define GOTO(address) \
{ \
switch(address) { \
case '[': goto array_begin; \
case 'a': goto array_continue; \
case 'e': goto error; \
case 'f': goto finish; \
case '{': goto object_begin; \
case 'o': goto object_continue; \
} \
}
// For the more constrained end_xxx() situation
#define CONTINUE(address) \
{ \
switch(address) { \
case 'a': goto array_continue; \
case 'o': goto object_continue; \
case 'f': goto finish; \
} \
}
#endif // SIMDJSON_USE_COMPUTED_GOTO
struct unified_machine_addresses {
ret_address_t array_begin;
ret_address_t array_continue;
ret_address_t error;
ret_address_t finish;
ret_address_t object_begin;
ret_address_t object_continue;
};
#undef FAIL_IF
#define FAIL_IF(EXPR) { if (EXPR) { return addresses.error; } }
struct structural_parser : structural_iterator {
/** Lets you append to the tape */
tape_writer tape;
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
/** Current depth (nested objects and arrays) */
uint32_t depth{0};
// For non-streaming, to pass an explicit 0 as next_structural, which enables optimizations
really_inline structural_parser(dom_parser_implementation &_parser, uint32_t start_structural_index)
: structural_iterator(_parser, start_structural_index),
tape{parser.doc->tape.get()},
current_string_buf_loc{parser.doc->string_buf.get()} {
}
WARN_UNUSED really_inline bool start_scope(ret_address_t continue_state) {
parser.containing_scope[depth].tape_index = next_tape_index();
parser.containing_scope[depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
parser.ret_address[depth] = continue_state;
depth++;
bool exceeded_max_depth = depth >= parser.max_depth();
if (exceeded_max_depth) { log_error("Exceeded max depth!"); }
return exceeded_max_depth;
}
WARN_UNUSED really_inline bool start_document(ret_address_t continue_state) {
log_start_value("document");
return start_scope(continue_state);
}
WARN_UNUSED really_inline bool start_object(ret_address_t continue_state) {
log_start_value("object");
return start_scope(continue_state);
}
WARN_UNUSED really_inline bool start_array(ret_address_t continue_state) {
log_start_value("array");
return start_scope(continue_state);
}
// this function is responsible for annotating the start of the scope
really_inline void end_scope(internal::tape_type start, internal::tape_type end) noexcept {
depth--;
// write our doc->tape location to the header scope
// The root scope gets written *at* the previous location.
tape.append(parser.containing_scope[depth].tape_index, end);
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t start_tape_index = parser.containing_scope[depth].tape_index;
const uint32_t count = parser.containing_scope[depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
// This is a load and an OR. It would be possible to just write once at doc->tape[d.tape_index]
tape_writer::write(parser.doc->tape[start_tape_index], next_tape_index() | (uint64_t(cntsat) << 32), start);
}
really_inline uint32_t next_tape_index() {
return uint32_t(tape.next_tape_loc - parser.doc->tape.get());
}
really_inline void end_object() {
log_end_value("object");
end_scope(internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
really_inline void end_array() {
log_end_value("array");
end_scope(internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
really_inline void end_document() {
log_end_value("document");
end_scope(internal::tape_type::ROOT, internal::tape_type::ROOT);
}
// increment_count increments the count of keys in an object or values in an array.
// Note that if you are at the level of the values or elements, the count
// must be increment in the preceding depth (depth-1) where the array or
// the object resides.
really_inline void increment_count() {
parser.containing_scope[depth - 1].count++; // we have a key value pair in the object at parser.depth - 1
}
really_inline uint8_t *on_start_string() noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
really_inline void on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
WARN_UNUSED really_inline bool parse_string(bool key = false) {
log_value(key ? "key" : "string");
uint8_t *dst = on_start_string();
dst = stringparsing::parse_string(current(), dst);
if (dst == nullptr) {
log_error("Invalid escape in string");
return true;
}
on_end_string(dst);
return false;
}
WARN_UNUSED really_inline bool parse_number(const uint8_t *src, bool found_minus) {
log_value("number");
bool succeeded = numberparsing::parse_number(src, found_minus, tape);
if (!succeeded) { log_error("Invalid number"); }
return !succeeded;
}
WARN_UNUSED really_inline bool parse_number(bool found_minus) {
return parse_number(current(), found_minus);
}
really_inline bool parse_number_with_space_terminated_copy(const bool is_negative) {
/**
* We need to make a copy to make sure that the string is space terminated.
* This is not about padding the input, which should already padded up
* to len + SIMDJSON_PADDING. However, we have no control at this stage
* on how the padding was done. What if the input string was padded with nulls?
* It is quite common for an input string to have an extra null character (C string).
* We do not want to allow 9\0 (where \0 is the null character) inside a JSON
* document, but the string "9\0" by itself is fine. So we make a copy and
* pad the input with spaces when we know that there is just one input element.
* This copy is relatively expensive, but it will almost never be called in
* practice unless you are in the strange scenario where you have many JSON
* documents made of single atoms.
*/
uint8_t *copy = static_cast<uint8_t *>(malloc(parser.len + SIMDJSON_PADDING));
if (copy == nullptr) {
return true;
}
memcpy(copy, buf, parser.len);
memset(copy + parser.len, ' ', SIMDJSON_PADDING);
size_t idx = *current_structural;
bool result = parse_number(&copy[idx], is_negative); // parse_number does not throw
free(copy);
return result;
}
WARN_UNUSED really_inline ret_address_t parse_value(const unified_machine_addresses &addresses, ret_address_t continue_state) {
switch (advance_char()) {
case '"':
FAIL_IF( parse_string() );
return continue_state;
case 't':
log_value("true");
FAIL_IF( !atomparsing::is_valid_true_atom(current()) );
tape.append(0, internal::tape_type::TRUE_VALUE);
return continue_state;
case 'f':
log_value("false");
FAIL_IF( !atomparsing::is_valid_false_atom(current()) );
tape.append(0, internal::tape_type::FALSE_VALUE);
return continue_state;
case 'n':
log_value("null");
FAIL_IF( !atomparsing::is_valid_null_atom(current()) );
tape.append(0, internal::tape_type::NULL_VALUE);
return continue_state;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
FAIL_IF( parse_number(false) );
return continue_state;
case '-':
FAIL_IF( parse_number(true) );
return continue_state;
case '{':
FAIL_IF( start_object(continue_state) );
return addresses.object_begin;
case '[':
FAIL_IF( start_array(continue_state) );
return addresses.array_begin;
default:
log_error("Non-value found when value was expected!");
return addresses.error;
}
}
WARN_UNUSED really_inline error_code finish() {
end_document();
parser.next_structural_index = uint32_t(current_structural + 1 - &parser.structural_indexes[0]);
if (depth != 0) {
log_error("Unclosed objects or arrays!");
return parser.error = TAPE_ERROR;
}
return SUCCESS;
}
WARN_UNUSED really_inline error_code error() {
/* We do not need the next line because this is done by parser.init_stage2(),
* pessimistically.
* parser.is_valid = false;
* At this point in the code, we have all the time in the world.
* Note that we know exactly where we are in the document so we could,
* without any overhead on the processing code, report a specific
* location.
* We could even trigger special code paths to assess what happened
* carefully,
* all without any added cost. */
if (depth >= parser.max_depth()) {
return parser.error = DEPTH_ERROR;
}
switch (current_char()) {
case '"':
return parser.error = STRING_ERROR;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '-':
return parser.error = NUMBER_ERROR;
case 't':
return parser.error = T_ATOM_ERROR;
case 'n':
return parser.error = N_ATOM_ERROR;
case 'f':
return parser.error = F_ATOM_ERROR;
default:
return parser.error = TAPE_ERROR;
}
}
really_inline void init() {
log_start();
parser.error = UNINITIALIZED;
}
WARN_UNUSED really_inline error_code start(ret_address_t finish_state) {
// If there are no structurals left, return EMPTY
if (at_end(parser.n_structural_indexes)) {
return parser.error = EMPTY;
}
init();
// Push the root scope (there is always at least one scope)
if (start_document(finish_state)) {
return parser.error = DEPTH_ERROR;
}
return SUCCESS;
}
really_inline void log_value(const char *type) {
logger::log_line(*this, "", type, "");
}
static really_inline void log_start() {
logger::log_start();
}
really_inline void log_start_value(const char *type) {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
really_inline void log_end_value(const char *type) {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
really_inline void log_error(const char *error) {
logger::log_line(*this, "", "ERROR", error);
}
}; // struct structural_parser
// Redefine FAIL_IF to use goto since it'll be used inside the function now
#undef FAIL_IF
#define FAIL_IF(EXPR) { if (EXPR) { goto error; } }
template<bool STREAMING>
WARN_UNUSED static error_code parse_structurals(dom_parser_implementation &dom_parser, dom::document &doc) noexcept {
dom_parser.doc = &doc;
static constexpr stage2::unified_machine_addresses addresses = INIT_ADDRESSES();
stage2::structural_parser parser(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
error_code result = parser.start(addresses.finish);
if (result) { return result; }
//
// Read first value
//
switch (parser.current_char()) {
case '{':
FAIL_IF( parser.start_object(addresses.finish) );
goto object_begin;
case '[':
FAIL_IF( parser.start_array(addresses.finish) );
// Make sure the outer array is closed before continuing; otherwise, there are ways we could get
// into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
if (parser.buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]] != ']') {
goto error;
}
}
goto array_begin;
case '"':
FAIL_IF( parser.parse_string() );
goto finish;
case 't':
parser.log_value("true");
FAIL_IF( !atomparsing::is_valid_true_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::TRUE_VALUE);
goto finish;
case 'f':
parser.log_value("false");
FAIL_IF( !atomparsing::is_valid_false_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::FALSE_VALUE);
goto finish;
case 'n':
parser.log_value("null");
FAIL_IF( !atomparsing::is_valid_null_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::NULL_VALUE);
goto finish;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
// Next line used to be an interesting functional programming exercise with
// a lambda that gets passed to another function via a closure. This would confuse the
// clangcl compiler under Visual Studio 2019 (recent release).
{ if(parser.parse_number_with_space_terminated_copy(false)) { goto error; }}
goto finish;
case '-':
// Next line used to be an interesting functional programming exercise with
// a lambda that gets passed to another function via a closure. This would confuse the
// clangcl compiler under Visual Studio 2019 (recent release).
{ if(parser.parse_number_with_space_terminated_copy(true)) { goto error; }}
goto finish;
default:
parser.log_error("Document starts with a non-value character");
goto error;
}
//
// Object parser states
//
object_begin:
switch (parser.advance_char()) {
case '"': {
parser.increment_count();
FAIL_IF( parser.parse_string(true) );
goto object_key_state;
}
case '}':
parser.end_object();
goto scope_end;
default:
parser.log_error("Object does not start with a key");
goto error;
}
object_key_state:
if (parser.advance_char() != ':' ) { parser.log_error("Missing colon after key in object"); goto error; }
GOTO( parser.parse_value(addresses, addresses.object_continue) );
object_continue:
switch (parser.advance_char()) {
case ',':
parser.increment_count();
if (parser.advance_char() != '"' ) { parser.log_error("Key string missing at beginning of field in object"); goto error; }
FAIL_IF( parser.parse_string(true) );
goto object_key_state;
case '}':
parser.end_object();
goto scope_end;
default:
parser.log_error("No comma between object fields");
goto error;
}
scope_end:
CONTINUE( parser.parser.ret_address[parser.depth] );
//
// Array parser states
//
array_begin:
if (parser.peek_next_char() == ']') {
parser.advance_char();
parser.end_array();
goto scope_end;
}
parser.increment_count();
main_array_switch:
/* we call update char on all paths in, so we can peek at parser.c on the
* on paths that can accept a close square brace (post-, and at start) */
GOTO( parser.parse_value(addresses, addresses.array_continue) );
array_continue:
switch (parser.advance_char()) {
case ',':
parser.increment_count();
goto main_array_switch;
case ']':
parser.end_array();
goto scope_end;
default:
parser.log_error("Missing comma between array values");
goto error;
}
finish:
return parser.finish();
error:
return parser.error();
}
} // namespace {}
} // namespace stage2
/************
* The JSON is parsed to a tape, see the accompanying tape.md file
* for documentation.
***********/
WARN_UNUSED error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
error_code result = stage2::parse_structurals<false>(*this, _doc);
if (result) { return result; }
// If we didn't make it to the end, it's an error
if ( next_structural_index != n_structural_indexes ) {
logger::log_string("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return error = TAPE_ERROR;
}
return SUCCESS;
}
/************
* The JSON is parsed to a tape, see the accompanying tape.md file
* for documentation.
***********/
WARN_UNUSED error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::parse_structurals<true>(*this, _doc);
}
/* end file src/generic/stage2/tape_writer.h */
WARN_UNUSED error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
error_code err = stage1(_buf, _len, false);
if (err) { return err; }
return stage2(_doc);
}
} // namespace arm64
} // namespace simdjson
/* end file src/generic/stage2/tape_writer.h */
#endif
#if SIMDJSON_IMPLEMENTATION_FALLBACK
/* begin file src/fallback/implementation.cpp */
/* fallback/implementation.h already included: #include "fallback/implementation.h" */
/* begin file src/fallback/dom_parser_implementation.h */
#ifndef SIMDJSON_FALLBACK_DOM_PARSER_IMPLEMENTATION_H
#define SIMDJSON_FALLBACK_DOM_PARSER_IMPLEMENTATION_H
/* isadetection.h already included: #include "isadetection.h" */
namespace simdjson {
namespace fallback {
/* begin file src/generic/dom_parser_implementation.h */
// expectation: sizeof(scope_descriptor) = 64/8.
struct scope_descriptor {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct scope_descriptor
#ifdef SIMDJSON_USE_COMPUTED_GOTO
typedef void* ret_address_t;
#else
typedef char ret_address_t;
#endif
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<scope_descriptor[]> containing_scope{};
/** Return address of each open { or [ */
std::unique_ptr<ret_address_t[]> ret_address{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
/** Error code (TODO remove, this is not even used, we just set it so the g++ optimizer doesn't get confused) */
error_code error{UNINITIALIZED};
really_inline dom_parser_implementation();
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation & operator=(const dom_parser_implementation &) = delete;
WARN_UNUSED error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
WARN_UNUSED error_code stage1(const uint8_t *buf, size_t len, bool partial) noexcept final;
WARN_UNUSED error_code check_for_unclosed_array() noexcept;
WARN_UNUSED error_code stage2(dom::document &doc) noexcept final;
WARN_UNUSED error_code stage2_next(dom::document &doc) noexcept final;
WARN_UNUSED error_code set_capacity(size_t capacity) noexcept final;
WARN_UNUSED error_code set_max_depth(size_t max_depth) noexcept final;
};
/* begin file src/generic/stage1/allocate.h */
namespace stage1 {
namespace allocate {
//
// Allocates stage 1 internal state and outputs in the parser
//
really_inline error_code set_capacity(internal::dom_parser_implementation &parser, size_t capacity) {
size_t max_structures = ROUNDUP_N(capacity, 64) + 2 + 7;
parser.structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!parser.structural_indexes) { return MEMALLOC; }
parser.structural_indexes[0] = 0;
parser.n_structural_indexes = 0;
return SUCCESS;
}
} // namespace allocate
} // namespace stage1
/* end file src/generic/stage1/allocate.h */
/* begin file src/generic/stage2/allocate.h */
namespace stage2 {
namespace allocate {
//
// Allocates stage 2 internal state and outputs in the parser
//
really_inline error_code set_max_depth(dom_parser_implementation &parser, size_t max_depth) {
parser.containing_scope.reset(new (std::nothrow) scope_descriptor[max_depth]);
parser.ret_address.reset(new (std::nothrow) ret_address_t[max_depth]);
if (!parser.ret_address || !parser.containing_scope) {
return MEMALLOC;
}
return SUCCESS;
}
} // namespace allocate
} // namespace stage2
/* end file src/generic/stage2/allocate.h */
really_inline dom_parser_implementation::dom_parser_implementation() {}
// Leaving these here so they can be inlined if so desired
WARN_UNUSED error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
error_code err = stage1::allocate::set_capacity(*this, capacity);
if (err) { _capacity = 0; return err; }
_capacity = capacity;
return SUCCESS;
}
WARN_UNUSED error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
error_code err = stage2::allocate::set_max_depth(*this, max_depth);
if (err) { _max_depth = 0; return err; }
_max_depth = max_depth;
return SUCCESS;
}
/* end file src/generic/stage2/allocate.h */
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_DOM_PARSER_IMPLEMENTATION_H
/* end file src/generic/stage2/allocate.h */
TARGET_HASWELL
namespace simdjson {
namespace fallback {
WARN_UNUSED error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
dst->set_capacity(capacity);
dst->set_max_depth(max_depth);
return SUCCESS;
}
} // namespace fallback
} // namespace simdjson
UNTARGET_REGION
/* end file src/generic/stage2/allocate.h */
/* begin file src/fallback/dom_parser_implementation.cpp */
/* fallback/implementation.h already included: #include "fallback/implementation.h" */
/* fallback/dom_parser_implementation.h already included: #include "fallback/dom_parser_implementation.h" */
//
// Stage 1
//
namespace simdjson {
namespace fallback {
namespace stage1 {
/* begin file src/generic/stage1/find_next_document_index.h */
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ';' ','
* and when the second element is NOT one of these characters: '}' '}' ';' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
really_inline static uint32_t find_next_document_index(dom_parser_implementation &parser) {
// TODO don't count separately, just figure out depth
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
return 0;
}
// Skip the last character if it is partial
really_inline static size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0b11100000) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0b11100000) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0b11110000) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
/* end file src/generic/stage1/find_next_document_index.h */
class structural_scanner {
public:
really_inline structural_scanner(dom_parser_implementation &_parser, bool _partial)
: buf{_parser.buf},
next_structural_index{_parser.structural_indexes.get()},
parser{_parser},
len{static_cast<uint32_t>(_parser.len)},
partial{_partial} {
}
really_inline void add_structural() {
*next_structural_index = idx;
next_structural_index++;
}
really_inline bool is_continuation(uint8_t c) {
return (c & 0b11000000) == 0b10000000;
}
really_inline void validate_utf8_character() {
// Continuation
if (unlikely((buf[idx] & 0b01000000) == 0)) {
// extra continuation
error = UTF8_ERROR;
idx++;
return;
}
// 2-byte
if ((buf[idx] & 0b00100000) == 0) {
// missing continuation
if (unlikely(idx+1 > len || !is_continuation(buf[idx+1]))) {
if (idx+1 > len && partial) { idx = len; return; }
error = UTF8_ERROR;
idx++;
return;
}
// overlong: 1100000_ 10______
if (buf[idx] <= 0b11000001) { error = UTF8_ERROR; }
idx += 2;
return;
}
// 3-byte
if ((buf[idx] & 0b00010000) == 0) {
// missing continuation
if (unlikely(idx+2 > len || !is_continuation(buf[idx+1]) || !is_continuation(buf[idx+2]))) {
if (idx+2 > len && partial) { idx = len; return; }
error = UTF8_ERROR;
idx++;
return;
}
// overlong: 11100000 100_____ ________
if (buf[idx] == 0b11100000 && buf[idx+1] <= 0b10011111) { error = UTF8_ERROR; }
// surrogates: U+D800-U+DFFF 11101101 101_____
if (buf[idx] == 0b11101101 && buf[idx+1] >= 0b10100000) { error = UTF8_ERROR; }
idx += 3;
return;
}
// 4-byte
// missing continuation
if (unlikely(idx+3 > len || !is_continuation(buf[idx+1]) || !is_continuation(buf[idx+2]) || !is_continuation(buf[idx+3]))) {
if (idx+2 > len && partial) { idx = len; return; }
error = UTF8_ERROR;
idx++;
return;
}
// overlong: 11110000 1000____ ________ ________
if (buf[idx] == 0b11110000 && buf[idx+1] <= 0b10001111) { error = UTF8_ERROR; }
// too large: > U+10FFFF:
// 11110100 (1001|101_)____
// 1111(1___|011_|0101) 10______
// also includes 5, 6, 7 and 8 byte characters:
// 11111___
if (buf[idx] == 0b11110100 && buf[idx+1] >= 0b10010000) { error = UTF8_ERROR; }
if (buf[idx] >= 0b11110101) { error = UTF8_ERROR; }
idx += 4;
}
really_inline void validate_string() {
idx++; // skip first quote
while (idx < len && buf[idx] != '"') {
if (buf[idx] == '\\') {
idx += 2;
} else if (unlikely(buf[idx] & 0b10000000)) {
validate_utf8_character();
} else {
if (buf[idx] < 0x20) { error = UNESCAPED_CHARS; }
idx++;
}
}
if (idx >= len && !partial) { error = UNCLOSED_STRING; }
}
really_inline bool is_whitespace_or_operator(uint8_t c) {
switch (c) {
case '{': case '}': case '[': case ']': case ',': case ':':
case ' ': case '\r': case '\n': case '\t':
return true;
default:
return false;
}
}
//
// Parse the entire input in STEP_SIZE-byte chunks.
//
really_inline error_code scan() {
for (;idx<len;idx++) {
switch (buf[idx]) {
// String
case '"':
add_structural();
validate_string();
break;
// Operator
case '{': case '}': case '[': case ']': case ',': case ':':
add_structural();
break;
// Whitespace
case ' ': case '\r': case '\n': case '\t':
break;
// Primitive or invalid character (invalid characters will be checked in stage 2)
default:
// Anything else, add the structural and go until we find the next one
add_structural();
while (idx+1<len && !is_whitespace_or_operator(buf[idx+1])) {
idx++;
};
break;
}
}
*next_structural_index = len;
// We pad beyond.
// https://github.com/simdjson/simdjson/issues/906
next_structural_index[1] = len;
next_structural_index[2] = 0;
parser.n_structural_indexes = uint32_t(next_structural_index - parser.structural_indexes.get());
parser.next_structural_index = 0;
if (unlikely(parser.n_structural_indexes == 0)) {
return EMPTY;
}
if (partial) {
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
return CAPACITY; // If the buffer is partial but the document is incomplete, it's too big to parse.
}
parser.n_structural_indexes = new_structural_indexes;
}
return error;
}
private:
const uint8_t *buf;
uint32_t *next_structural_index;
dom_parser_implementation &parser;
uint32_t len;
uint32_t idx{0};
error_code error{SUCCESS};
bool partial;
}; // structural_scanner
} // namespace stage1
WARN_UNUSED error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, bool partial) noexcept {
this->buf = _buf;
this->len = _len;
stage1::structural_scanner scanner(*this, partial);
return scanner.scan();
}
// big table for the minifier
static uint8_t jump_table[256 * 3] = {
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0,
1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
};
WARN_UNUSED error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
size_t i = 0, pos = 0;
uint8_t quote = 0;
uint8_t nonescape = 1;
while (i < len) {
unsigned char c = buf[i];
uint8_t *meta = jump_table + 3 * c;
quote = quote ^ (meta[0] & nonescape);
dst[pos] = c;
pos += meta[2] | quote;
i += 1;
nonescape = uint8_t(~nonescape) | (meta[1]);
}
dst_len = pos; // we intentionally do not work with a reference
// for fear of aliasing
return SUCCESS;
}
// credit: based on code from Google Fuchsia (Apache Licensed)
WARN_UNUSED bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
const uint8_t *data = (const uint8_t *)buf;
uint64_t pos = 0;
uint64_t next_pos = 0;
uint32_t code_point = 0;
while (pos < len) {
// check of the next 8 bytes are ascii.
next_pos = pos + 16;
if (next_pos <= len) { // if it is safe to read 8 more bytes, check that they are ascii
uint64_t v1;
memcpy(&v1, data + pos, sizeof(uint64_t));
uint64_t v2;
memcpy(&v2, data + pos + sizeof(uint64_t), sizeof(uint64_t));
uint64_t v{v1 | v2};
if ((v & 0x8080808080808080) == 0) {
pos = next_pos;
continue;
}
}
unsigned char byte = data[pos];
if (byte < 0b10000000) {
pos++;
continue;
} else if ((byte & 0b11100000) == 0b11000000) {
next_pos = pos + 2;
if (next_pos > len) { return false; }
if ((data[pos + 1] & 0b11000000) != 0b10000000) { return false; }
// range check
code_point = (byte & 0b00011111) << 6 | (data[pos + 1] & 0b00111111);
if (code_point < 0x80 || 0x7ff < code_point) { return false; }
} else if ((byte & 0b11110000) == 0b11100000) {
next_pos = pos + 3;
if (next_pos > len) { return false; }
if ((data[pos + 1] & 0b11000000) != 0b10000000) { return false; }
if ((data[pos + 2] & 0b11000000) != 0b10000000) { return false; }
// range check
code_point = (byte & 0b00001111) << 12 |
(data[pos + 1] & 0b00111111) << 6 |
(data[pos + 2] & 0b00111111);
if (code_point < 0x800 || 0xffff < code_point ||
(0xd7ff < code_point && code_point < 0xe000)) {
return false;
}
} else if ((byte & 0b11111000) == 0b11110000) { // 0b11110000
next_pos = pos + 4;
if (next_pos > len) { return false; }
if ((data[pos + 1] & 0b11000000) != 0b10000000) { return false; }
if ((data[pos + 2] & 0b11000000) != 0b10000000) { return false; }
if ((data[pos + 3] & 0b11000000) != 0b10000000) { return false; }
// range check
code_point =
(byte & 0b00000111) << 18 | (data[pos + 1] & 0b00111111) << 12 |
(data[pos + 2] & 0b00111111) << 6 | (data[pos + 3] & 0b00111111);
if (code_point < 0xffff || 0x10ffff < code_point) { return false; }
} else {
// we may have a continuation
return false;
}
pos = next_pos;
}
return true;
}
} // namespace fallback
} // namespace simdjson
//
// Stage 2
//
/* begin file src/fallback/stringparsing.h */
#ifndef SIMDJSON_FALLBACK_STRINGPARSING_H
#define SIMDJSON_FALLBACK_STRINGPARSING_H
/* jsoncharutils.h already included: #include "jsoncharutils.h" */
namespace simdjson {
namespace fallback {
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 1;
really_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
really_inline bool has_quote_first() { return c == '"'; }
really_inline bool has_backslash() { return c == '\\'; }
really_inline int quote_index() { return c == '"' ? 0 : 1; }
really_inline int backslash_index() { return c == '\\' ? 0 : 1; }
uint8_t c;
}; // struct backslash_and_quote
really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// store to dest unconditionally - we can overwrite the bits we don't like later
dst[0] = src[0];
return { src[0] };
}
/* begin file src/generic/stage2/stringparsing.h */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is include already includes
// "stringparsing.h" (this simplifies amalgation)
namespace stage2 {
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
WARN_UNUSED
really_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion isn't valid; we defer the check for this to inside the
// multilingual plane check
uint32_t code_point = hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// check for low surrogate for characters outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
if (((*src_ptr)[0] != '\\') || (*src_ptr)[1] != 'u') {
return false;
}
uint32_t code_point_2 = hex_to_u32_nocheck(*src_ptr + 2);
// if the first code point is invalid we will get here, as we will go past
// the check for being outside the Basic Multilingual plane. If we don't
// find a \u immediately afterwards we fail out anyhow, but if we do,
// this check catches both the case of the first code point being invalid
// or the second code point being invalid.
if ((code_point | code_point_2) >> 16) {
return false;
}
code_point =
(((code_point - 0xd800) << 10) | (code_point_2 - 0xdc00)) + 0x10000;
*src_ptr += 6;
}
size_t offset = codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
WARN_UNUSED really_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst) {
src++;
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
/* can't be reached */
return nullptr;
}
} // namespace stringparsing
} // namespace stage2
/* end file src/generic/stage2/stringparsing.h */
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_STRINGPARSING_H
/* end file src/generic/stage2/stringparsing.h */
/* begin file src/fallback/numberparsing.h */
#ifndef SIMDJSON_FALLBACK_NUMBERPARSING_H
#define SIMDJSON_FALLBACK_NUMBERPARSING_H
/* jsoncharutils.h already included: #include "jsoncharutils.h" */
/* begin file src/fallback/bitmanipulation.h */
#ifndef SIMDJSON_FALLBACK_BITMANIPULATION_H
#define SIMDJSON_FALLBACK_BITMANIPULATION_H
#include <limits>
namespace simdjson {
namespace fallback {
#if defined(_MSC_VER) && !defined(_M_ARM64) && !defined(_M_X64)
static inline unsigned char _BitScanForward64(unsigned long* ret, uint64_t x) {
unsigned long x0 = (unsigned long)x, top, bottom;
_BitScanForward(&top, (unsigned long)(x >> 32));
_BitScanForward(&bottom, x0);
*ret = x0 ? bottom : 32 + top;
return x != 0;
}
static unsigned char _BitScanReverse64(unsigned long* ret, uint64_t x) {
unsigned long x1 = (unsigned long)(x >> 32), top, bottom;
_BitScanReverse(&top, x1);
_BitScanReverse(&bottom, (unsigned long)x);
*ret = x1 ? top + 32 : bottom;
return x != 0;
}
#endif
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
NO_SANITIZE_UNDEFINED
really_inline int trailing_zeroes(uint64_t input_num) {
#ifdef _MSC_VER
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // _MSC_VER
return __builtin_ctzll(input_num);
#endif // _MSC_VER
}
/* result might be undefined when input_num is zero */
really_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
really_inline int leading_zeroes(uint64_t input_num) {
#ifdef _MSC_VER
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// _MSC_VER
}
really_inline bool add_overflow(uint64_t value1, uint64_t value2, uint64_t *result) {
*result = value1 + value2;
return *result < value1;
}
really_inline bool mul_overflow(uint64_t value1, uint64_t value2, uint64_t *result) {
*result = value1 * value2;
// TODO there must be a faster way
return value2 > 0 && value1 > std::numeric_limits<uint64_t>::max() / value2;
}
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_BITMANIPULATION_H
/* end file src/fallback/bitmanipulation.h */
#include <cmath>
#include <limits>
#ifdef JSON_TEST_NUMBERS // for unit testing
void found_invalid_number(const uint8_t *buf);
void found_integer(int64_t result, const uint8_t *buf);
void found_unsigned_integer(uint64_t result, const uint8_t *buf);
void found_float(double result, const uint8_t *buf);
#endif
namespace simdjson {
namespace fallback {
static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
uint32_t result = 0;
for (int i=0;i<8;i++) {
result = result*10 + (chars[i] - '0');
}
return result;
}
#define SWAR_NUMBER_PARSING
/* begin file src/generic/stage2/numberparsing.h */
namespace stage2 {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), false)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), writer.append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), writer.append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), writer.append_double((VALUE)))
#else
#define INVALID_NUMBER(SRC) (false)
#define WRITE_INTEGER(VALUE, SRC, WRITER) writer.append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) writer.append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) writer.append_double((VALUE))
#endif
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [FASTFLOAT_SMALLEST_POWER,
// FASTFLOAT_LARGEST_POWER] interval: the caller is responsible for this check.
really_inline double compute_float_64(int64_t power, uint64_t i, bool negative, bool *success) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991) {
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991) {
#endif
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
double d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / power_of_ten[-power];
} else {
d = d * power_of_ten[power];
}
if (negative) {
d = -d;
}
*success = true;
return d;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It wa
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
return 0.0;
}
// We are going to need to do some 64-bit arithmetic to get a more precise product.
// We use a table lookup approach.
components c =
power_of_ten_components[power - FASTFLOAT_SMALLEST_POWER];
// safe because
// power >= FASTFLOAT_SMALLEST_POWER
// and power <= FASTFLOAT_LARGEST_POWER
// we recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
uint64_t factor_mantissa = c.mantissa;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
value128 product = full_multiplication(i, factor_mantissa);
uint64_t lower = product.low;
uint64_t upper = product.high;
// We know that upper has at most one leading zero because
// both i and factor_mantissa have a leading one. This means
// that the result is at least as large as ((1<<63)*(1<<63))/(1<<64).
// As long as the first 9 bits of "upper" are not "1", then we
// know that we have an exact computed value for the leading
// 55 bits because any imprecision would play out as a +1, in
// the worst case.
if (unlikely((upper & 0x1FF) == 0x1FF) && (lower + i < lower)) {
uint64_t factor_mantissa_low =
mantissa_128[power - FASTFLOAT_SMALLEST_POWER];
// next, we compute the 64-bit x 128-bit multiplication, getting a 192-bit
// result (three 64-bit values)
product = full_multiplication(i, factor_mantissa_low);
uint64_t product_low = product.low;
uint64_t product_middle2 = product.high;
uint64_t product_middle1 = lower;
uint64_t product_high = upper;
uint64_t product_middle = product_middle1 + product_middle2;
if (product_middle < product_middle1) {
product_high++; // overflow carry
}
// We want to check whether mantissa *i + i would affect our result.
// This does happen, e.g. with 7.3177701707893310e+15.
if (((product_middle + 1 == 0) && ((product_high & 0x1FF) == 0x1FF) &&
(product_low + i < product_low))) { // let us be prudent and bail out.
*success = false;
return 0;
}
upper = product_high;
lower = product_middle;
}
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
if (unlikely((lower == 0) && ((upper & 0x1FF) == 0) &&
((mantissa & 3) == 1))) {
// if mantissa & 1 == 1 we might need to round up.
//
// Scenarios:
// 1. We are not in the middle. Then we should round up.
//
// 2. We are right in the middle. Whether we round up depends
// on the last significant bit: if it is "one" then we round
// up (round to even) otherwise, we do not.
//
// So if the last significant bit is 1, we can safely round up.
// Hence we only need to bail out if (mantissa & 3) == 1.
// Otherwise we may need more accuracy or analysis to determine whether
// we are exactly between two floating-point numbers.
// It can be triggered with 1e23.
// Note: because the factor_mantissa and factor_mantissa_low are
// almost always rounded down (except for small positive powers),
// almost always should round up.
*success = false;
return 0;
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
lz--; // undo previous addition
}
mantissa &= ~(1ULL << 52);
uint64_t real_exponent = c.exp - lz;
// we have to check that real_exponent is in range, otherwise we bail out
if (unlikely((real_exponent < 1) || (real_exponent > 2046))) {
*success = false;
return 0;
}
mantissa |= real_exponent << 52;
mantissa |= (((uint64_t)negative) << 63);
double d;
memcpy(&d, &mantissa, sizeof(d));
*success = true;
return d;
}
static bool parse_float_strtod(const char *ptr, double *outDouble) {
char *endptr;
*outDouble = strtod(ptr, &endptr);
// Some libraries will set errno = ERANGE when the value is subnormal,
// yet we may want to be able to parse subnormal values.
// However, we do not want to tolerate NAN or infinite values.
//
// Values like infinity or NaN are not allowed in the JSON specification.
// If you consume a large value and you map it to "infinity", you will no
// longer be able to serialize back a standard-compliant JSON. And there is
// no realistic application where you might need values so large than they
// can't fit in binary64. The maximal value is about 1.7976931348623157 x
// 10^308 It is an unimaginable large number. There will never be any piece of
// engineering involving as many as 10^308 parts. It is estimated that there
// are about 10^80 atoms in the universe. The estimate for the total number
// of electrons is similar. Using a double-precision floating-point value, we
// can represent easily the number of atoms in the universe. We could also
// represent the number of ways you can pick any three individual atoms at
// random in the universe. If you ever encounter a number much larger than
// 10^308, you know that you have a bug. RapidJSON will reject a document with
// a float that does not fit in binary64. JSON for Modern C++ (nlohmann/json)
// will flat out throw an exception.
//
if ((endptr == ptr) || (!std::isfinite(*outDouble))) {
return false;
}
return true;
}
really_inline bool is_integer(char c) {
return (c >= '0' && c <= '9');
// this gets compiled to (uint8_t)(c - '0') <= 9 on all decent compilers
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
really_inline bool is_made_of_eight_digits_fast(const char *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename W>
bool slow_float_parsing(UNUSED const char * src, W writer) {
double d;
if (parse_float_strtod(src, &d)) {
WRITE_DOUBLE(d, (const uint8_t *)src, writer);
return true;
}
return INVALID_NUMBER((const uint8_t *)src);
}
really_inline bool parse_decimal(UNUSED const uint8_t *const src, const char *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const char *const first_after_period = p;
if (!is_integer(*p)) { return INVALID_NUMBER(src); } // There must be at least one digit after the .
unsigned char digit = static_cast<unsigned char>(*p - '0');
++p;
i = i * 10 + digit; // might overflow + multiplication by 10 is likely
// cheaper than arbitrary mult.
// we will handle the overflow later
#ifdef SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif
while (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
++p;
i = i * 10 + digit; // in rare cases, this will overflow, but that's ok
// because we have parse_highprecision_float later.
}
exponent = first_after_period - p;
return true;
}
really_inline bool parse_exponent(UNUSED const uint8_t *const src, const char *&p, int64_t &exponent) {
bool neg_exp = false;
if ('-' == *p) {
neg_exp = true;
++p;
} else if ('+' == *p) {
++p;
}
// e[+-] must be followed by a number
if (!is_integer(*p)) { return INVALID_NUMBER(src); }
unsigned char digit = static_cast<unsigned char>(*p - '0');
int64_t exp_number = digit;
p++;
if (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
if (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
while (is_integer(*p)) {
// we need to check for overflows; we refuse to parse this
if (exp_number > 0x100000000) { return INVALID_NUMBER(src); }
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
exponent += (neg_exp ? -exp_number : exp_number);
return true;
}
template<typename W>
really_inline bool write_float(const uint8_t *const src, bool negative, uint64_t i, const char * start_digits, int digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
// digit count is off by 1 because of the decimal (assuming there was one).
if (unlikely((digit_count-1 >= 19))) { // this is uncommon
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const char *start = start_digits;
while ((*start == '0') || (*start == '.')) {
start++;
}
// we over-decrement by one when there is a '.'
digit_count -= int(start - start_digits);
if (digit_count >= 19) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
bool success = slow_float_parsing((const char *) src, writer);
// The number was already written, but we made a copy of the writer
// when we passed it to the parse_large_integer() function, so
writer.skip_double();
return success;
}
}
// NOTE: it's weird that the unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (unlikely(exponent < FASTFLOAT_SMALLEST_POWER) || (exponent > FASTFLOAT_LARGEST_POWER)) {
// this is almost never going to get called!!!
// we start anew, going slowly!!!
bool success = slow_float_parsing((const char *) src, writer);
// The number was already written, but we made a copy of the writer when we passed it to the
// slow_float_parsing() function, so we have to skip those tape spots now that we've returned
writer.skip_double();
return success;
}
bool success = true;
double d = compute_float_64(exponent, i, negative, &success);
if (!success) {
// we are almost never going to get here.
if (!parse_float_strtod((const char *)src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return true;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
really_inline bool parse_number(UNUSED const uint8_t *const src,
UNUSED bool found_minus,
W &writer) {
#ifdef SIMDJSON_SKIPNUMBERPARSING // for performance analysis, it is sometimes
// useful to skip parsing
writer.append_s64(0); // always write zero
return true; // always succeeds
#else
const char *p = reinterpret_cast<const char *>(src);
bool negative = false;
if (found_minus) {
++p;
negative = true;
// a negative sign must be followed by an integer
if (!is_integer(*p)) { return INVALID_NUMBER(src); }
}
const char *const start_digits = p;
uint64_t i; // an unsigned int avoids signed overflows (which are bad)
if (*p == '0') {
++p;
if (is_integer(*p)) { return INVALID_NUMBER(src); } // 0 cannot be followed by an integer
i = 0;
} else {
// NOTE: This is a redundant check--either we're negative, in which case we checked whether this
// is a digit above, or the caller already determined we start with a digit. But removing this
// check seems to make things slower: https://github.com/simdjson/simdjson/pull/990#discussion_r448512448
// Please do try yourself, or think of ways to explain it--we'd love to understand :)
if (!is_integer(*p)) { return INVALID_NUMBER(src); } // must start with an integer
unsigned char digit = static_cast<unsigned char>(*p - '0');
i = digit;
p++;
// the is_made_of_eight_digits_fast routine is unlikely to help here because
// we rarely see large integer parts like 123456789
while (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
// a multiplication by 10 is cheaper than an arbitrary integer
// multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
++p;
}
}
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
if (!parse_decimal(src, p, i, exponent)) { return false; }
}
int digit_count = int(p - start_digits); // used later to guard against overflows
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
if (!parse_exponent(src, p, exponent)) { return false; }
}
if (is_float) {
return write_float(src, negative, i, start_digits, digit_count, exponent, writer);
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
int longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return INVALID_NUMBER(src); }
if (digit_count == longest_digit_count) {
// Anything negative above INT64_MAX is either invalid or INT64_MIN.
if (negative && i > uint64_t(INT64_MAX)) {
// If the number is negative and can't fit in a signed integer, it's invalid.
if (i > uint64_t(INT64_MAX)+1) { return INVALID_NUMBER(src); }
// If it's negative, it has to be INT64_MAX+1 now (or INT64_MIN).
// C++ can't reliably negate uint64_t INT64_MIN, it seems. Special case it.
WRITE_INTEGER(INT64_MIN, src, writer);
return is_structural_or_whitespace(*p);
}
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to 9,223,372,036,854,775,808 (INT64_MAX).
//
if (!negative && (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX))) { return INVALID_NUMBER(src); }
}
// Write unsigned if it doesn't fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? 0 - i : i, src, writer);
}
return is_structural_or_whitespace(*p);
#endif // SIMDJSON_SKIPNUMBERPARSING
}
} // namespace numberparsing
} // namespace stage2
/* end file src/generic/stage2/numberparsing.h */
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_NUMBERPARSING_H
/* end file src/generic/stage2/numberparsing.h */
namespace simdjson {
namespace fallback {
/* begin file src/generic/stage2/logger.h */
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
static constexpr const bool LOG_ENABLED = false;
static constexpr const int LOG_EVENT_LEN = 30;
static constexpr const int LOG_BUFFER_LEN = 20;
static constexpr const int LOG_DETAIL_LEN = 50;
static constexpr const int LOG_INDEX_LEN = 10;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static really_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static really_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %*s | %*s | %*s | %-*s | %-*s | %-*s |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", 4, "Curr", 4, "Next", 5, "Next#", 5, "Tape#", LOG_DETAIL_LEN, "Detail", LOG_INDEX_LEN, "index");
printf("|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, 4+2, DASHES, 4+2, DASHES, 5+2, DASHES, 5+2, DASHES, LOG_DETAIL_LEN+2, DASHES, LOG_INDEX_LEN+2, DASHES);
}
}
static really_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line of
template<typename S>
static really_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(structurals.current()[i]));
}
printf(" ");
}
printf("| %c ", printable_char(structurals.current_char()));
printf("| %c ", printable_char(structurals.peek_next_char()));
printf("| %5u ", structurals.parser.structural_indexes[*(structurals.current_structural+1)]);
printf("| %5u ", structurals.next_tape_index());
printf("| %-*s ", LOG_DETAIL_LEN, detail);
printf("| %*u ", LOG_INDEX_LEN, *structurals.current_structural);
printf("|\n");
}
}
} // namespace logger
/* end file src/generic/stage2/logger.h */
/* begin file src/generic/stage2/atomparsing.h */
namespace stage2 {
namespace atomparsing {
really_inline uint32_t string_to_uint32(const char* str) { return *reinterpret_cast<const uint32_t *>(str); }
WARN_UNUSED
really_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 64-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | is_not_structural_or_whitespace(src[5])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // namespace stage2
/* end file src/generic/stage2/atomparsing.h */
/* begin file src/generic/stage2/structural_iterator.h */
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *current_structural;
dom_parser_implementation &parser;
// Start a structural
really_inline structural_iterator(dom_parser_implementation &_parser, size_t start_structural_index)
: buf{_parser.buf},
current_structural{&_parser.structural_indexes[start_structural_index]},
parser{_parser} {
}
// Get the buffer position of the current structural character
really_inline const uint8_t* current() {
return &buf[*current_structural];
}
// Get the current structural character
really_inline char current_char() {
return buf[*current_structural];
}
// Get the next structural character without advancing
really_inline char peek_next_char() {
return buf[*(current_structural+1)];
}
really_inline char advance_char() {
current_structural++;
return buf[*current_structural];
}
really_inline size_t remaining_len() {
return parser.len - *current_structural;
}
really_inline bool past_end(uint32_t n_structural_indexes) {
return current_structural >= &parser.structural_indexes[n_structural_indexes];
}
really_inline bool at_end(uint32_t n_structural_indexes) {
return current_structural == &parser.structural_indexes[n_structural_indexes];
}
really_inline bool at_beginning() {
return current_structural == parser.structural_indexes.get();
}
};
} // namespace stage2
/* end file src/generic/stage2/structural_iterator.h */
/* begin file src/generic/stage2/structural_parser.h */
// This file contains the common code every implementation uses for stage2
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is include already includes
// "simdjson/stage2.h" (this simplifies amalgation)
namespace stage2 {
namespace { // Make everything here private
/* begin file src/generic/stage2/tape_writer.h */
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
really_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
really_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
really_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
really_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
really_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
really_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
really_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
really_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
really_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct number_writer
really_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
really_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
really_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
really_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
really_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
really_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
really_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
really_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
really_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
/* end file src/generic/stage2/tape_writer.h */
#ifdef SIMDJSON_USE_COMPUTED_GOTO
#define INIT_ADDRESSES() { &&array_begin, &&array_continue, &&error, &&finish, &&object_begin, &&object_continue }
#define GOTO(address) { goto *(address); }
#define CONTINUE(address) { goto *(address); }
#else // SIMDJSON_USE_COMPUTED_GOTO
#define INIT_ADDRESSES() { '[', 'a', 'e', 'f', '{', 'o' };
#define GOTO(address) \
{ \
switch(address) { \
case '[': goto array_begin; \
case 'a': goto array_continue; \
case 'e': goto error; \
case 'f': goto finish; \
case '{': goto object_begin; \
case 'o': goto object_continue; \
} \
}
// For the more constrained end_xxx() situation
#define CONTINUE(address) \
{ \
switch(address) { \
case 'a': goto array_continue; \
case 'o': goto object_continue; \
case 'f': goto finish; \
} \
}
#endif // SIMDJSON_USE_COMPUTED_GOTO
struct unified_machine_addresses {
ret_address_t array_begin;
ret_address_t array_continue;
ret_address_t error;
ret_address_t finish;
ret_address_t object_begin;
ret_address_t object_continue;
};
#undef FAIL_IF
#define FAIL_IF(EXPR) { if (EXPR) { return addresses.error; } }
struct structural_parser : structural_iterator {
/** Lets you append to the tape */
tape_writer tape;
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
/** Current depth (nested objects and arrays) */
uint32_t depth{0};
// For non-streaming, to pass an explicit 0 as next_structural, which enables optimizations
really_inline structural_parser(dom_parser_implementation &_parser, uint32_t start_structural_index)
: structural_iterator(_parser, start_structural_index),
tape{parser.doc->tape.get()},
current_string_buf_loc{parser.doc->string_buf.get()} {
}
WARN_UNUSED really_inline bool start_scope(ret_address_t continue_state) {
parser.containing_scope[depth].tape_index = next_tape_index();
parser.containing_scope[depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
parser.ret_address[depth] = continue_state;
depth++;
bool exceeded_max_depth = depth >= parser.max_depth();
if (exceeded_max_depth) { log_error("Exceeded max depth!"); }
return exceeded_max_depth;
}
WARN_UNUSED really_inline bool start_document(ret_address_t continue_state) {
log_start_value("document");
return start_scope(continue_state);
}
WARN_UNUSED really_inline bool start_object(ret_address_t continue_state) {
log_start_value("object");
return start_scope(continue_state);
}
WARN_UNUSED really_inline bool start_array(ret_address_t continue_state) {
log_start_value("array");
return start_scope(continue_state);
}
// this function is responsible for annotating the start of the scope
really_inline void end_scope(internal::tape_type start, internal::tape_type end) noexcept {
depth--;
// write our doc->tape location to the header scope
// The root scope gets written *at* the previous location.
tape.append(parser.containing_scope[depth].tape_index, end);
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t start_tape_index = parser.containing_scope[depth].tape_index;
const uint32_t count = parser.containing_scope[depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
// This is a load and an OR. It would be possible to just write once at doc->tape[d.tape_index]
tape_writer::write(parser.doc->tape[start_tape_index], next_tape_index() | (uint64_t(cntsat) << 32), start);
}
really_inline uint32_t next_tape_index() {
return uint32_t(tape.next_tape_loc - parser.doc->tape.get());
}
really_inline void end_object() {
log_end_value("object");
end_scope(internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
really_inline void end_array() {
log_end_value("array");
end_scope(internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
really_inline void end_document() {
log_end_value("document");
end_scope(internal::tape_type::ROOT, internal::tape_type::ROOT);
}
// increment_count increments the count of keys in an object or values in an array.
// Note that if you are at the level of the values or elements, the count
// must be increment in the preceding depth (depth-1) where the array or
// the object resides.
really_inline void increment_count() {
parser.containing_scope[depth - 1].count++; // we have a key value pair in the object at parser.depth - 1
}
really_inline uint8_t *on_start_string() noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
really_inline void on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
WARN_UNUSED really_inline bool parse_string(bool key = false) {
log_value(key ? "key" : "string");
uint8_t *dst = on_start_string();
dst = stringparsing::parse_string(current(), dst);
if (dst == nullptr) {
log_error("Invalid escape in string");
return true;
}
on_end_string(dst);
return false;
}
WARN_UNUSED really_inline bool parse_number(const uint8_t *src, bool found_minus) {
log_value("number");
bool succeeded = numberparsing::parse_number(src, found_minus, tape);
if (!succeeded) { log_error("Invalid number"); }
return !succeeded;
}
WARN_UNUSED really_inline bool parse_number(bool found_minus) {
return parse_number(current(), found_minus);
}
really_inline bool parse_number_with_space_terminated_copy(const bool is_negative) {
/**
* We need to make a copy to make sure that the string is space terminated.
* This is not about padding the input, which should already padded up
* to len + SIMDJSON_PADDING. However, we have no control at this stage
* on how the padding was done. What if the input string was padded with nulls?
* It is quite common for an input string to have an extra null character (C string).
* We do not want to allow 9\0 (where \0 is the null character) inside a JSON
* document, but the string "9\0" by itself is fine. So we make a copy and
* pad the input with spaces when we know that there is just one input element.
* This copy is relatively expensive, but it will almost never be called in
* practice unless you are in the strange scenario where you have many JSON
* documents made of single atoms.
*/
uint8_t *copy = static_cast<uint8_t *>(malloc(parser.len + SIMDJSON_PADDING));
if (copy == nullptr) {
return true;
}
memcpy(copy, buf, parser.len);
memset(copy + parser.len, ' ', SIMDJSON_PADDING);
size_t idx = *current_structural;
bool result = parse_number(&copy[idx], is_negative); // parse_number does not throw
free(copy);
return result;
}
WARN_UNUSED really_inline ret_address_t parse_value(const unified_machine_addresses &addresses, ret_address_t continue_state) {
switch (advance_char()) {
case '"':
FAIL_IF( parse_string() );
return continue_state;
case 't':
log_value("true");
FAIL_IF( !atomparsing::is_valid_true_atom(current()) );
tape.append(0, internal::tape_type::TRUE_VALUE);
return continue_state;
case 'f':
log_value("false");
FAIL_IF( !atomparsing::is_valid_false_atom(current()) );
tape.append(0, internal::tape_type::FALSE_VALUE);
return continue_state;
case 'n':
log_value("null");
FAIL_IF( !atomparsing::is_valid_null_atom(current()) );
tape.append(0, internal::tape_type::NULL_VALUE);
return continue_state;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
FAIL_IF( parse_number(false) );
return continue_state;
case '-':
FAIL_IF( parse_number(true) );
return continue_state;
case '{':
FAIL_IF( start_object(continue_state) );
return addresses.object_begin;
case '[':
FAIL_IF( start_array(continue_state) );
return addresses.array_begin;
default:
log_error("Non-value found when value was expected!");
return addresses.error;
}
}
WARN_UNUSED really_inline error_code finish() {
end_document();
parser.next_structural_index = uint32_t(current_structural + 1 - &parser.structural_indexes[0]);
if (depth != 0) {
log_error("Unclosed objects or arrays!");
return parser.error = TAPE_ERROR;
}
return SUCCESS;
}
WARN_UNUSED really_inline error_code error() {
/* We do not need the next line because this is done by parser.init_stage2(),
* pessimistically.
* parser.is_valid = false;
* At this point in the code, we have all the time in the world.
* Note that we know exactly where we are in the document so we could,
* without any overhead on the processing code, report a specific
* location.
* We could even trigger special code paths to assess what happened
* carefully,
* all without any added cost. */
if (depth >= parser.max_depth()) {
return parser.error = DEPTH_ERROR;
}
switch (current_char()) {
case '"':
return parser.error = STRING_ERROR;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '-':
return parser.error = NUMBER_ERROR;
case 't':
return parser.error = T_ATOM_ERROR;
case 'n':
return parser.error = N_ATOM_ERROR;
case 'f':
return parser.error = F_ATOM_ERROR;
default:
return parser.error = TAPE_ERROR;
}
}
really_inline void init() {
log_start();
parser.error = UNINITIALIZED;
}
WARN_UNUSED really_inline error_code start(ret_address_t finish_state) {
// If there are no structurals left, return EMPTY
if (at_end(parser.n_structural_indexes)) {
return parser.error = EMPTY;
}
init();
// Push the root scope (there is always at least one scope)
if (start_document(finish_state)) {
return parser.error = DEPTH_ERROR;
}
return SUCCESS;
}
really_inline void log_value(const char *type) {
logger::log_line(*this, "", type, "");
}
static really_inline void log_start() {
logger::log_start();
}
really_inline void log_start_value(const char *type) {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
really_inline void log_end_value(const char *type) {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
really_inline void log_error(const char *error) {
logger::log_line(*this, "", "ERROR", error);
}
}; // struct structural_parser
// Redefine FAIL_IF to use goto since it'll be used inside the function now
#undef FAIL_IF
#define FAIL_IF(EXPR) { if (EXPR) { goto error; } }
template<bool STREAMING>
WARN_UNUSED static error_code parse_structurals(dom_parser_implementation &dom_parser, dom::document &doc) noexcept {
dom_parser.doc = &doc;
static constexpr stage2::unified_machine_addresses addresses = INIT_ADDRESSES();
stage2::structural_parser parser(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
error_code result = parser.start(addresses.finish);
if (result) { return result; }
//
// Read first value
//
switch (parser.current_char()) {
case '{':
FAIL_IF( parser.start_object(addresses.finish) );
goto object_begin;
case '[':
FAIL_IF( parser.start_array(addresses.finish) );
// Make sure the outer array is closed before continuing; otherwise, there are ways we could get
// into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
if (parser.buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]] != ']') {
goto error;
}
}
goto array_begin;
case '"':
FAIL_IF( parser.parse_string() );
goto finish;
case 't':
parser.log_value("true");
FAIL_IF( !atomparsing::is_valid_true_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::TRUE_VALUE);
goto finish;
case 'f':
parser.log_value("false");
FAIL_IF( !atomparsing::is_valid_false_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::FALSE_VALUE);
goto finish;
case 'n':
parser.log_value("null");
FAIL_IF( !atomparsing::is_valid_null_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::NULL_VALUE);
goto finish;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
// Next line used to be an interesting functional programming exercise with
// a lambda that gets passed to another function via a closure. This would confuse the
// clangcl compiler under Visual Studio 2019 (recent release).
{ if(parser.parse_number_with_space_terminated_copy(false)) { goto error; }}
goto finish;
case '-':
// Next line used to be an interesting functional programming exercise with
// a lambda that gets passed to another function via a closure. This would confuse the
// clangcl compiler under Visual Studio 2019 (recent release).
{ if(parser.parse_number_with_space_terminated_copy(true)) { goto error; }}
goto finish;
default:
parser.log_error("Document starts with a non-value character");
goto error;
}
//
// Object parser states
//
object_begin:
switch (parser.advance_char()) {
case '"': {
parser.increment_count();
FAIL_IF( parser.parse_string(true) );
goto object_key_state;
}
case '}':
parser.end_object();
goto scope_end;
default:
parser.log_error("Object does not start with a key");
goto error;
}
object_key_state:
if (parser.advance_char() != ':' ) { parser.log_error("Missing colon after key in object"); goto error; }
GOTO( parser.parse_value(addresses, addresses.object_continue) );
object_continue:
switch (parser.advance_char()) {
case ',':
parser.increment_count();
if (parser.advance_char() != '"' ) { parser.log_error("Key string missing at beginning of field in object"); goto error; }
FAIL_IF( parser.parse_string(true) );
goto object_key_state;
case '}':
parser.end_object();
goto scope_end;
default:
parser.log_error("No comma between object fields");
goto error;
}
scope_end:
CONTINUE( parser.parser.ret_address[parser.depth] );
//
// Array parser states
//
array_begin:
if (parser.peek_next_char() == ']') {
parser.advance_char();
parser.end_array();
goto scope_end;
}
parser.increment_count();
main_array_switch:
/* we call update char on all paths in, so we can peek at parser.c on the
* on paths that can accept a close square brace (post-, and at start) */
GOTO( parser.parse_value(addresses, addresses.array_continue) );
array_continue:
switch (parser.advance_char()) {
case ',':
parser.increment_count();
goto main_array_switch;
case ']':
parser.end_array();
goto scope_end;
default:
parser.log_error("Missing comma between array values");
goto error;
}
finish:
return parser.finish();
error:
return parser.error();
}
} // namespace {}
} // namespace stage2
/************
* The JSON is parsed to a tape, see the accompanying tape.md file
* for documentation.
***********/
WARN_UNUSED error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
error_code result = stage2::parse_structurals<false>(*this, _doc);
if (result) { return result; }
// If we didn't make it to the end, it's an error
if ( next_structural_index != n_structural_indexes ) {
logger::log_string("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return error = TAPE_ERROR;
}
return SUCCESS;
}
/************
* The JSON is parsed to a tape, see the accompanying tape.md file
* for documentation.
***********/
WARN_UNUSED error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::parse_structurals<true>(*this, _doc);
}
/* end file src/generic/stage2/tape_writer.h */
WARN_UNUSED error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
error_code err = stage1(_buf, _len, false);
if (err) { return err; }
return stage2(_doc);
}
} // namespace fallback
} // namespace simdjson
/* end file src/generic/stage2/tape_writer.h */
#endif
#if SIMDJSON_IMPLEMENTATION_HASWELL
/* begin file src/haswell/implementation.cpp */
/* haswell/implementation.h already included: #include "haswell/implementation.h" */
/* begin file src/haswell/dom_parser_implementation.h */
#ifndef SIMDJSON_HASWELL_DOM_PARSER_IMPLEMENTATION_H
#define SIMDJSON_HASWELL_DOM_PARSER_IMPLEMENTATION_H
/* isadetection.h already included: #include "isadetection.h" */
namespace simdjson {
namespace haswell {
/* begin file src/generic/dom_parser_implementation.h */
// expectation: sizeof(scope_descriptor) = 64/8.
struct scope_descriptor {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct scope_descriptor
#ifdef SIMDJSON_USE_COMPUTED_GOTO
typedef void* ret_address_t;
#else
typedef char ret_address_t;
#endif
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<scope_descriptor[]> containing_scope{};
/** Return address of each open { or [ */
std::unique_ptr<ret_address_t[]> ret_address{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
/** Error code (TODO remove, this is not even used, we just set it so the g++ optimizer doesn't get confused) */
error_code error{UNINITIALIZED};
really_inline dom_parser_implementation();
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation & operator=(const dom_parser_implementation &) = delete;
WARN_UNUSED error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
WARN_UNUSED error_code stage1(const uint8_t *buf, size_t len, bool partial) noexcept final;
WARN_UNUSED error_code check_for_unclosed_array() noexcept;
WARN_UNUSED error_code stage2(dom::document &doc) noexcept final;
WARN_UNUSED error_code stage2_next(dom::document &doc) noexcept final;
WARN_UNUSED error_code set_capacity(size_t capacity) noexcept final;
WARN_UNUSED error_code set_max_depth(size_t max_depth) noexcept final;
};
/* begin file src/generic/stage1/allocate.h */
namespace stage1 {
namespace allocate {
//
// Allocates stage 1 internal state and outputs in the parser
//
really_inline error_code set_capacity(internal::dom_parser_implementation &parser, size_t capacity) {
size_t max_structures = ROUNDUP_N(capacity, 64) + 2 + 7;
parser.structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!parser.structural_indexes) { return MEMALLOC; }
parser.structural_indexes[0] = 0;
parser.n_structural_indexes = 0;
return SUCCESS;
}
} // namespace allocate
} // namespace stage1
/* end file src/generic/stage1/allocate.h */
/* begin file src/generic/stage2/allocate.h */
namespace stage2 {
namespace allocate {
//
// Allocates stage 2 internal state and outputs in the parser
//
really_inline error_code set_max_depth(dom_parser_implementation &parser, size_t max_depth) {
parser.containing_scope.reset(new (std::nothrow) scope_descriptor[max_depth]);
parser.ret_address.reset(new (std::nothrow) ret_address_t[max_depth]);
if (!parser.ret_address || !parser.containing_scope) {
return MEMALLOC;
}
return SUCCESS;
}
} // namespace allocate
} // namespace stage2
/* end file src/generic/stage2/allocate.h */
really_inline dom_parser_implementation::dom_parser_implementation() {}
// Leaving these here so they can be inlined if so desired
WARN_UNUSED error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
error_code err = stage1::allocate::set_capacity(*this, capacity);
if (err) { _capacity = 0; return err; }
_capacity = capacity;
return SUCCESS;
}
WARN_UNUSED error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
error_code err = stage2::allocate::set_max_depth(*this, max_depth);
if (err) { _max_depth = 0; return err; }
_max_depth = max_depth;
return SUCCESS;
}
/* end file src/generic/stage2/allocate.h */
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_DOM_PARSER_IMPLEMENTATION_H
/* end file src/generic/stage2/allocate.h */
TARGET_HASWELL
namespace simdjson {
namespace haswell {
WARN_UNUSED error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
dst->set_capacity(capacity);
dst->set_max_depth(max_depth);
return SUCCESS;
}
} // namespace haswell
} // namespace simdjson
UNTARGET_REGION
/* end file src/generic/stage2/allocate.h */
/* begin file src/haswell/dom_parser_implementation.cpp */
/* haswell/implementation.h already included: #include "haswell/implementation.h" */
/* haswell/dom_parser_implementation.h already included: #include "haswell/dom_parser_implementation.h" */
//
// Stage 1
//
/* begin file src/haswell/bitmask.h */
#ifndef SIMDJSON_HASWELL_BITMASK_H
#define SIMDJSON_HASWELL_BITMASK_H
/* begin file src/haswell/intrinsics.h */
#ifndef SIMDJSON_HASWELL_INTRINSICS_H
#define SIMDJSON_HASWELL_INTRINSICS_H
#ifdef SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#ifdef SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
* e.g., if __AVX2__ is set... in turn, we normally set these
* macros by compiling against the corresponding architecture
* (e.g., arch:AVX2, -mavx2, etc.) which compiles the whole
* software with these advanced instructions. In simdjson, we
* want to compile the whole program for a generic target,
* and only target our specific kernels. As a workaround,
* we directly include the needed headers. These headers would
* normally guard against such usage, but we carefully included
* <x86intrin.h> (or <intrin.h>) before, so the headers
* are fooled.
*/
#include <bmiintrin.h> // for _blsr_u64
#include <lzcntintrin.h> // for __lzcnt64
#include <immintrin.h> // for most things (AVX2, AVX512, _popcnt64)
#include <smmintrin.h>
#include <tmmintrin.h>
#include <avxintrin.h>
#include <avx2intrin.h>
#include <wmmintrin.h> // for _mm_clmulepi64_si128
// unfortunately, we may not get _blsr_u64, but, thankfully, clang
// has it as a macro.
#ifndef _blsr_u64
// we roll our own
TARGET_HASWELL
static really_inline uint64_t simdjson_blsr_u64(uint64_t n) {
return (n - 1) & n;
}
UNTARGET_REGION
#define _blsr_u64(a) (simdjson_blsr_u64((a)))
#endif // _blsr_u64
#endif
#endif // SIMDJSON_HASWELL_INTRINSICS_H
/* end file src/haswell/intrinsics.h */
TARGET_HASWELL
namespace simdjson {
namespace haswell {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
really_inline uint64_t prefix_xor(const uint64_t bitmask) {
// There should be no such thing with a processor supporting avx2
// but not clmul.
__m128i all_ones = _mm_set1_epi8('\xFF');
__m128i result = _mm_clmulepi64_si128(_mm_set_epi64x(0ULL, bitmask), all_ones, 0);
return _mm_cvtsi128_si64(result);
}
} // namespace haswell
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_HASWELL_BITMASK_H
/* end file src/haswell/intrinsics.h */
/* begin file src/haswell/simd.h */
#ifndef SIMDJSON_HASWELL_SIMD_H
#define SIMDJSON_HASWELL_SIMD_H
/* simdprune_tables.h already included: #include "simdprune_tables.h" */
/* begin file src/haswell/bitmanipulation.h */
#ifndef SIMDJSON_HASWELL_BITMANIPULATION_H
#define SIMDJSON_HASWELL_BITMANIPULATION_H
/* haswell/intrinsics.h already included: #include "haswell/intrinsics.h" */
TARGET_HASWELL
namespace simdjson {
namespace haswell {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
NO_SANITIZE_UNDEFINED
really_inline int trailing_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
return (int)_tzcnt_u64(input_num);
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
////////
// You might expect the next line to be equivalent to
// return (int)_tzcnt_u64(input_num);
// but the generated code differs and might be less efficient?
////////
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
really_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return _blsr_u64(input_num);
}
/* result might be undefined when input_num is zero */
really_inline int leading_zeroes(uint64_t input_num) {
return int(_lzcnt_u64(input_num));
}
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
really_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
really_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
really_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
(unsigned long long *)result);
#endif
}
#if defined(SIMDJSON_REGULAR_VISUAL_STUDIO) || defined(SIMDJSON_IS_32BITS)
#pragma intrinsic(_umul128)
#endif
really_inline bool mul_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
uint64_t high;
*result = _umul128(value1, value2, &high);
return high;
#else
return __builtin_umulll_overflow(value1, value2,
(unsigned long long *)result);
#endif
}
} // namespace haswell
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_HASWELL_BITMANIPULATION_H
/* end file src/haswell/bitmanipulation.h */
/* haswell/intrinsics.h already included: #include "haswell/intrinsics.h" */
TARGET_HASWELL
namespace simdjson {
namespace haswell {
namespace simd {
// Forward-declared so they can be used by splat and friends.
template<typename Child>
struct base {
__m256i value;
// Zero constructor
really_inline base() : value{__m256i()} {}
// Conversion from SIMD register
really_inline base(const __m256i _value) : value(_value) {}
// Conversion to SIMD register
really_inline operator const __m256i&() const { return this->value; }
really_inline operator __m256i&() { return this->value; }
// Bit operations
really_inline Child operator|(const Child other) const { return _mm256_or_si256(*this, other); }
really_inline Child operator&(const Child other) const { return _mm256_and_si256(*this, other); }
really_inline Child operator^(const Child other) const { return _mm256_xor_si256(*this, other); }
really_inline Child bit_andnot(const Child other) const { return _mm256_andnot_si256(other, *this); }
really_inline Child& operator|=(const Child other) { auto this_cast = (Child*)this; *this_cast = *this_cast | other; return *this_cast; }
really_inline Child& operator&=(const Child other) { auto this_cast = (Child*)this; *this_cast = *this_cast & other; return *this_cast; }
really_inline Child& operator^=(const Child other) { auto this_cast = (Child*)this; *this_cast = *this_cast ^ other; return *this_cast; }
};
// Forward-declared so they can be used by splat and friends.
template<typename T>
struct simd8;
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint32_t bitmask_t;
typedef uint64_t bitmask2_t;
really_inline base8() : base<simd8<T>>() {}
really_inline base8(const __m256i _value) : base<simd8<T>>(_value) {}
really_inline Mask operator==(const simd8<T> other) const { return _mm256_cmpeq_epi8(*this, other); }
static const int SIZE = sizeof(base<T>::value);
template<int N=1>
really_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return _mm256_alignr_epi8(*this, _mm256_permute2x128_si256(prev_chunk, *this, 0x21), 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static really_inline simd8<bool> splat(bool _value) { return _mm256_set1_epi8(uint8_t(-(!!_value))); }
really_inline simd8<bool>() : base8() {}
really_inline simd8<bool>(const __m256i _value) : base8<bool>(_value) {}
// Splat constructor
really_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
really_inline int to_bitmask() const { return _mm256_movemask_epi8(*this); }
really_inline bool any() const { return !_mm256_testz_si256(*this, *this); }
really_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static really_inline simd8<T> splat(T _value) { return _mm256_set1_epi8(_value); }
static really_inline simd8<T> zero() { return _mm256_setzero_si256(); }
static really_inline simd8<T> load(const T values[32]) {
return _mm256_loadu_si256(reinterpret_cast<const __m256i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static really_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
really_inline base8_numeric() : base8<T>() {}
really_inline base8_numeric(const __m256i _value) : base8<T>(_value) {}
// Store to array
really_inline void store(T dst[32]) const { return _mm256_storeu_si256(reinterpret_cast<__m256i *>(dst), *this); }
// Addition/subtraction are the same for signed and unsigned
really_inline simd8<T> operator+(const simd8<T> other) const { return _mm256_add_epi8(*this, other); }
really_inline simd8<T> operator-(const simd8<T> other) const { return _mm256_sub_epi8(*this, other); }
really_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *(simd8<T>*)this; }
really_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *(simd8<T>*)this; }
// Override to distinguish from bool version
really_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
really_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm256_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 32 - count_ones(mask) bytes of the result are significant but 32 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
really_inline void compress(uint32_t mask, L * output) const {
// this particular implementation was inspired by work done by @animetosho
// we do it in four steps, first 8 bytes and then second 8 bytes...
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // second least significant 8 bits
uint8_t mask3 = uint8_t(mask >> 16); // ...
uint8_t mask4 = uint8_t(mask >> 24); // ...
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
__m256i shufmask = _mm256_set_epi64x(thintable_epi8[mask4], thintable_epi8[mask3],
thintable_epi8[mask2], thintable_epi8[mask1]);
// we increment by 0x08 the second half of the mask and so forth
shufmask =
_mm256_add_epi8(shufmask, _mm256_set_epi32(0x18181818, 0x18181818,
0x10101010, 0x10101010, 0x08080808, 0x08080808, 0, 0));
// this is the version "nearly pruned"
__m256i pruned = _mm256_shuffle_epi8(*this, shufmask);
// we still need to put the pieces back together.
// we compute the popcount of the first words:
int pop1 = BitsSetTable256mul2[mask1];
int pop3 = BitsSetTable256mul2[mask3];
// then load the corresponding mask
// could be done with _mm256_loadu2_m128i but many standard libraries omit this intrinsic.
__m256i v256 = _mm256_castsi128_si256(
_mm_loadu_si128((const __m128i *)(pshufb_combine_table + pop1 * 8)));
__m256i compactmask = _mm256_insertf128_si256(v256,
_mm_loadu_si128((const __m128i *)(pshufb_combine_table + pop3 * 8)), 1);
__m256i almostthere = _mm256_shuffle_epi8(pruned, compactmask);
// We just need to write out the result.
// This is the tricky bit that is hard to do
// if we want to return a SIMD register, since there
// is no single-instruction approach to recombine
// the two 128-bit lanes with an offset.
__m128i v128;
v128 = _mm256_castsi256_si128(almostthere);
_mm_storeu_si128( (__m128i *)output, v128);
v128 = _mm256_extractf128_si256(almostthere, 1);
_mm_storeu_si128( (__m128i *)(output + 16 - count_ones(mask & 0xFFFF)), v128);
}
template<typename L>
really_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
really_inline simd8() : base8_numeric<int8_t>() {}
really_inline simd8(const __m256i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
really_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
really_inline simd8(const int8_t values[32]) : simd8(load(values)) {}
// Member-by-member initialization
really_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15,
int8_t v16, int8_t v17, int8_t v18, int8_t v19, int8_t v20, int8_t v21, int8_t v22, int8_t v23,
int8_t v24, int8_t v25, int8_t v26, int8_t v27, int8_t v28, int8_t v29, int8_t v30, int8_t v31
) : simd8(_mm256_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v16,v17,v18,v19,v20,v21,v22,v23,
v24,v25,v26,v27,v28,v29,v30,v31
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
really_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
really_inline simd8<int8_t> max(const simd8<int8_t> other) const { return _mm256_max_epi8(*this, other); }
really_inline simd8<int8_t> min(const simd8<int8_t> other) const { return _mm256_min_epi8(*this, other); }
really_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm256_cmpgt_epi8(*this, other); }
really_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm256_cmpgt_epi8(other, *this); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
really_inline simd8() : base8_numeric<uint8_t>() {}
really_inline simd8(const __m256i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
really_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
really_inline simd8(const uint8_t values[32]) : simd8(load(values)) {}
// Member-by-member initialization
really_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15,
uint8_t v16, uint8_t v17, uint8_t v18, uint8_t v19, uint8_t v20, uint8_t v21, uint8_t v22, uint8_t v23,
uint8_t v24, uint8_t v25, uint8_t v26, uint8_t v27, uint8_t v28, uint8_t v29, uint8_t v30, uint8_t v31
) : simd8(_mm256_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v16,v17,v18,v19,v20,v21,v22,v23,
v24,v25,v26,v27,v28,v29,v30,v31
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
really_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
really_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm256_adds_epu8(*this, other); }
really_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm256_subs_epu8(*this, other); }
// Order-specific operations
really_inline simd8<uint8_t> max(const simd8<uint8_t> other) const { return _mm256_max_epu8(*this, other); }
really_inline simd8<uint8_t> min(const simd8<uint8_t> other) const { return _mm256_min_epu8(other, *this); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
really_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
really_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
really_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return other.max(*this) == other; }
really_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return other.min(*this) == other; }
really_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
really_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->lt_bits(other).any_bits_set(); }
// Bit-specific operations
really_inline simd8<bool> bits_not_set() const { return *this == uint8_t(0); }
really_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
really_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
really_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
really_inline bool bits_not_set_anywhere() const { return _mm256_testz_si256(*this, *this); }
really_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
really_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return _mm256_testz_si256(*this, bits); }
really_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
really_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm256_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
really_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm256_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
really_inline int get_bit() const { return _mm256_movemask_epi8(_mm256_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static const int NUM_CHUNKS = 64 / sizeof(simd8<T>);
const simd8<T> chunks[NUM_CHUNKS];
really_inline simd8x64() : chunks{simd8<T>(), simd8<T>()} {}
really_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1) : chunks{chunk0, chunk1} {}
really_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+32)} {}
template <typename F>
static really_inline void each_index(F const& each) {
each(0);
each(1);
}
really_inline void compress(uint64_t mask, T * output) const {
uint32_t mask1 = uint32_t(mask);
uint32_t mask2 = uint32_t(mask >> 32);
this->chunks[0].compress(mask1, output);
this->chunks[1].compress(mask2, output + 32 - count_ones(mask1));
}
really_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
}
really_inline uint64_t to_bitmask() const {
uint64_t r_lo = uint32_t(this->chunks[0].to_bitmask());
uint64_t r_hi = this->chunks[1].to_bitmask();
return r_lo | (r_hi << 32);
}
really_inline simd8x64<T> bit_or(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<T>(
this->chunks[0] | mask,
this->chunks[1] | mask
);
}
really_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask
).to_bitmask();
}
really_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // namespace haswell
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_HASWELL_SIMD_H
/* end file src/haswell/bitmanipulation.h */
/* haswell/bitmanipulation.h already included: #include "haswell/bitmanipulation.h" */
TARGET_HASWELL
namespace simdjson {
namespace haswell {
using namespace simd;
struct json_character_block {
static really_inline json_character_block classify(const simd::simd8x64<uint8_t> in);
really_inline uint64_t whitespace() const { return _whitespace; }
really_inline uint64_t op() const { return _op; }
really_inline uint64_t scalar() { return ~(op() | whitespace()); }
uint64_t _whitespace;
uint64_t _op;
};
really_inline json_character_block json_character_block::classify(const simd::simd8x64<uint8_t> in) {
// These lookups rely on the fact that anything < 127 will match the lower 4 bits, which is why
// we can't use the generic lookup_16.
auto whitespace_table = simd8<uint8_t>::repeat_16(' ', 100, 100, 100, 17, 100, 113, 2, 100, '\t', '\n', 112, 100, '\r', 100, 100);
auto op_table = simd8<uint8_t>::repeat_16(',', '}', 0, 0, 0xc0u, 0, 0, 0, 0, 0, 0, 0, 0, 0, ':', '{');
// We compute whitespace and op separately. If the code later only use one or the
// other, given the fact that all functions are aggressively inlined, we can
// hope that useless computations will be omitted. This is namely case when
// minifying (we only need whitespace).
uint64_t whitespace = simd8x64<bool>(
in.chunks[0] == simd8<uint8_t>(_mm256_shuffle_epi8(whitespace_table, in.chunks[0])),
in.chunks[1] == simd8<uint8_t>(_mm256_shuffle_epi8(whitespace_table, in.chunks[1]))
).to_bitmask();
uint64_t op = simd8x64<bool>(
(in.chunks[0] | 32) == simd8<uint8_t>(_mm256_shuffle_epi8(op_table, in.chunks[0]-',')),
(in.chunks[1] | 32) == simd8<uint8_t>(_mm256_shuffle_epi8(op_table, in.chunks[1]-','))
).to_bitmask();
return { whitespace, op };
}
really_inline bool is_ascii(simd8x64<uint8_t> input) {
simd8<uint8_t> bits = (input.chunks[0] | input.chunks[1]);
return !bits.any_bits_set_anywhere(0b10000000u);
}
really_inline simd8<bool> must_be_continuation(simd8<uint8_t> prev1, simd8<uint8_t> prev2, simd8<uint8_t> prev3) {
simd8<uint8_t> is_second_byte = prev1.saturating_sub(0b11000000u-1); // Only 11______ will be > 0
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0b11100000u-1); // Only 111_____ will be > 0
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0b11110000u-1); // Only 1111____ will be > 0
// Caller requires a bool (all 1's). All values resulting from the subtraction will be <= 64, so signed comparison is fine.
return simd8<int8_t>(is_second_byte | is_third_byte | is_fourth_byte) > int8_t(0);
}
really_inline simd8<bool> must_be_2_3_continuation(simd8<uint8_t> prev2, simd8<uint8_t> prev3) {
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0b11100000u-1); // Only 111_____ will be > 0
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0b11110000u-1); // Only 1111____ will be > 0
// Caller requires a bool (all 1's). All values resulting from the subtraction will be <= 64, so signed comparison is fine.
return simd8<int8_t>(is_third_byte | is_fourth_byte) > int8_t(0);
}
/* begin file src/generic/stage1/buf_block_reader.h */
// Walks through a buffer in block-sized increments, loading the last part with spaces
template<size_t STEP_SIZE>
struct buf_block_reader {
public:
really_inline buf_block_reader(const uint8_t *_buf, size_t _len);
really_inline size_t block_index();
really_inline bool has_full_block() const;
really_inline const uint8_t *full_block() const;
/**
* Get the last block, padded with spaces.
*
* There will always be a last block, with at least 1 byte, unless len == 0 (in which case this
* function fills the buffer with spaces and returns 0. In particular, if len == STEP_SIZE there
* will be 0 full_blocks and 1 remainder block with STEP_SIZE bytes and no spaces for padding.
*
* @return the number of effective characters in the last block.
*/
really_inline size_t get_remainder(uint8_t *dst) const;
really_inline void advance();
private:
const uint8_t *buf;
const size_t len;
const size_t lenminusstep;
size_t idx;
};
// Routines to print masks and text for debugging bitmask operations
UNUSED static char * format_input_text_64(const uint8_t *text) {
static char *buf = (char*)malloc(sizeof(simd8x64<uint8_t>) + 1);
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
buf[i] = int8_t(text[i]) < ' ' ? '_' : int8_t(text[i]);
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
// Routines to print masks and text for debugging bitmask operations
UNUSED static char * format_input_text(const simd8x64<uint8_t> in) {
static char *buf = (char*)malloc(sizeof(simd8x64<uint8_t>) + 1);
in.store((uint8_t*)buf);
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] < ' ') { buf[i] = '_'; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
UNUSED static char * format_mask(uint64_t mask) {
static char *buf = (char*)malloc(64 + 1);
for (size_t i=0; i<64; i++) {
buf[i] = (mask & (size_t(1) << i)) ? 'X' : ' ';
}
buf[64] = '\0';
return buf;
}
template<size_t STEP_SIZE>
really_inline buf_block_reader<STEP_SIZE>::buf_block_reader(const uint8_t *_buf, size_t _len) : buf{_buf}, len{_len}, lenminusstep{len < STEP_SIZE ? 0 : len - STEP_SIZE}, idx{0} {}
template<size_t STEP_SIZE>
really_inline size_t buf_block_reader<STEP_SIZE>::block_index() { return idx; }
template<size_t STEP_SIZE>
really_inline bool buf_block_reader<STEP_SIZE>::has_full_block() const {
return idx < lenminusstep;
}
template<size_t STEP_SIZE>
really_inline const uint8_t *buf_block_reader<STEP_SIZE>::full_block() const {
return &buf[idx];
}
template<size_t STEP_SIZE>
really_inline size_t buf_block_reader<STEP_SIZE>::get_remainder(uint8_t *dst) const {
memset(dst, 0x20, STEP_SIZE); // memset STEP_SIZE because it's more efficient to write out 8 or 16 bytes at once.
memcpy(dst, buf + idx, len - idx);
return len - idx;
}
template<size_t STEP_SIZE>
really_inline void buf_block_reader<STEP_SIZE>::advance() {
idx += STEP_SIZE;
}
/* end file src/generic/stage1/buf_block_reader.h */
/* begin file src/generic/stage1/json_string_scanner.h */
namespace stage1 {
struct json_string_block {
// Escaped characters (characters following an escape() character)
really_inline uint64_t escaped() const { return _escaped; }
// Escape characters (backslashes that are not escaped--i.e. in \\, includes only the first \)
really_inline uint64_t escape() const { return _backslash & ~_escaped; }
// Real (non-backslashed) quotes
really_inline uint64_t quote() const { return _quote; }
// Start quotes of strings
really_inline uint64_t string_end() const { return _quote & _in_string; }
// End quotes of strings
really_inline uint64_t string_start() const { return _quote & ~_in_string; }
// Only characters inside the string (not including the quotes)
really_inline uint64_t string_content() const { return _in_string & ~_quote; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
really_inline uint64_t non_quote_inside_string(uint64_t mask) const { return mask & _in_string; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
really_inline uint64_t non_quote_outside_string(uint64_t mask) const { return mask & ~_in_string; }
// Tail of string (everything except the start quote)
really_inline uint64_t string_tail() const { return _in_string ^ _quote; }
// backslash characters
uint64_t _backslash;
// escaped characters (backslashed--does not include the hex characters after \u)
uint64_t _escaped;
// real quotes (non-backslashed ones)
uint64_t _quote;
// string characters (includes start quote but not end quote)
uint64_t _in_string;
};
// Scans blocks for string characters, storing the state necessary to do so
class json_string_scanner {
public:
really_inline json_string_block next(const simd::simd8x64<uint8_t> in);
really_inline error_code finish(bool streaming);
private:
// Intended to be defined by the implementation
really_inline uint64_t find_escaped(uint64_t escape);
really_inline uint64_t find_escaped_branchless(uint64_t escape);
// Whether the last iteration was still inside a string (all 1's = true, all 0's = false).
uint64_t prev_in_string = 0ULL;
// Whether the first character of the next iteration is escaped.
uint64_t prev_escaped = 0ULL;
};
//
// Finds escaped characters (characters following \).
//
// Handles runs of backslashes like \\\" and \\\\" correctly (yielding 0101 and 01010, respectively).
//
// Does this by:
// - Shift the escape mask to get potentially escaped characters (characters after backslashes).
// - Mask escaped sequences that start on *even* bits with 1010101010 (odd bits are escaped, even bits are not)
// - Mask escaped sequences that start on *odd* bits with 0101010101 (even bits are escaped, odd bits are not)
//
// To distinguish between escaped sequences starting on even/odd bits, it finds the start of all
// escape sequences, filters out the ones that start on even bits, and adds that to the mask of
// escape sequences. This causes the addition to clear out the sequences starting on odd bits (since
// the start bit causes a carry), and leaves even-bit sequences alone.
//
// Example:
//
// text | \\\ | \\\"\\\" \\\" \\"\\" |
// escape | xxx | xx xxx xxx xx xx | Removed overflow backslash; will | it into follows_escape
// odd_starts | x | x x x | escape & ~even_bits & ~follows_escape
// even_seq | c| cxxx c xx c | c = carry bit -- will be masked out later
// invert_mask | | cxxx c xx c| even_seq << 1
// follows_escape | xx | x xx xxx xxx xx xx | Includes overflow bit
// escaped | x | x x x x x x x x |
// desired | x | x x x x x x x x |
// text | \\\ | \\\"\\\" \\\" \\"\\" |
//
really_inline uint64_t json_string_scanner::find_escaped_branchless(uint64_t backslash) {
// If there was overflow, pretend the first character isn't a backslash
backslash &= ~prev_escaped;
uint64_t follows_escape = backslash << 1 | prev_escaped;
// Get sequences starting on even bits by clearing out the odd series using +
const uint64_t even_bits = 0x5555555555555555ULL;
uint64_t odd_sequence_starts = backslash & ~even_bits & ~follows_escape;
uint64_t sequences_starting_on_even_bits;
prev_escaped = add_overflow(odd_sequence_starts, backslash, &sequences_starting_on_even_bits);
uint64_t invert_mask = sequences_starting_on_even_bits << 1; // The mask we want to return is the *escaped* bits, not escapes.
// Mask every other backslashed character as an escaped character
// Flip the mask for sequences that start on even bits, to correct them
return (even_bits ^ invert_mask) & follows_escape;
}
//
// Return a mask of all string characters plus end quotes.
//
// prev_escaped is overflow saying whether the next character is escaped.
// prev_in_string is overflow saying whether we're still in a string.
//
// Backslash sequences outside of quotes will be detected in stage 2.
//
really_inline json_string_block json_string_scanner::next(const simd::simd8x64<uint8_t> in) {
const uint64_t backslash = in.eq('\\');
const uint64_t escaped = find_escaped(backslash);
const uint64_t quote = in.eq('"') & ~escaped;
//
// prefix_xor flips on bits inside the string (and flips off the end quote).
//
// Then we xor with prev_in_string: if we were in a string already, its effect is flipped
// (characters inside strings are outside, and characters outside strings are inside).
//
const uint64_t in_string = prefix_xor(quote) ^ prev_in_string;
//
// Check if we're still in a string at the end of the box so the next block will know
//
// right shift of a signed value expected to be well-defined and standard
// compliant as of C++20, John Regher from Utah U. says this is fine code
//
prev_in_string = uint64_t(static_cast<int64_t>(in_string) >> 63);
// Use ^ to turn the beginning quote off, and the end quote on.
return {
backslash,
escaped,
quote,
in_string
};
}
really_inline error_code json_string_scanner::finish(bool streaming) {
if (prev_in_string and (not streaming)) {
return UNCLOSED_STRING;
}
return SUCCESS;
}
} // namespace stage1
/* end file src/generic/stage1/json_string_scanner.h */
/* begin file src/generic/stage1/json_scanner.h */
namespace stage1 {
/**
* A block of scanned json, with information on operators and scalars.
*/
struct json_block {
public:
/** The start of structurals */
really_inline uint64_t structural_start() { return potential_structural_start() & ~_string.string_tail(); }
/** All JSON whitespace (i.e. not in a string) */
really_inline uint64_t whitespace() { return non_quote_outside_string(_characters.whitespace()); }
// Helpers
/** Whether the given characters are inside a string (only works on non-quotes) */
really_inline uint64_t non_quote_inside_string(uint64_t mask) { return _string.non_quote_inside_string(mask); }
/** Whether the given characters are outside a string (only works on non-quotes) */
really_inline uint64_t non_quote_outside_string(uint64_t mask) { return _string.non_quote_outside_string(mask); }
// string and escape characters
json_string_block _string;
// whitespace, operators, scalars
json_character_block _characters;
// whether the previous character was a scalar
uint64_t _follows_potential_scalar;
private:
// Potential structurals (i.e. disregarding strings)
/** operators plus scalar starts like 123, true and "abc" */
really_inline uint64_t potential_structural_start() { return _characters.op() | potential_scalar_start(); }
/** the start of non-operator runs, like 123, true and "abc" */
really_inline uint64_t potential_scalar_start() { return _characters.scalar() & ~follows_potential_scalar(); }
/** whether the given character is immediately after a non-operator like 123, true or " */
really_inline uint64_t follows_potential_scalar() { return _follows_potential_scalar; }
};
/**
* Scans JSON for important bits: operators, strings, and scalars.
*
* The scanner starts by calculating two distinct things:
* - string characters (taking \" into account)
* - operators ([]{},:) and scalars (runs of non-operators like 123, true and "abc")
*
* To minimize data dependency (a key component of the scanner's speed), it finds these in parallel:
* in particular, the operator/scalar bit will find plenty of things that are actually part of
* strings. When we're done, json_block will fuse the two together by masking out tokens that are
* part of a string.
*/
class json_scanner {
public:
json_scanner() {}
really_inline json_block next(const simd::simd8x64<uint8_t> in);
really_inline error_code finish(bool streaming);
private:
// Whether the last character of the previous iteration is part of a scalar token
// (anything except whitespace or an operator).
uint64_t prev_scalar = 0ULL;
json_string_scanner string_scanner{};
};
//
// Check if the current character immediately follows a matching character.
//
// For example, this checks for quotes with backslashes in front of them:
//
// const uint64_t backslashed_quote = in.eq('"') & immediately_follows(in.eq('\'), prev_backslash);
//
really_inline uint64_t follows(const uint64_t match, uint64_t &overflow) {
const uint64_t result = match << 1 | overflow;
overflow = match >> 63;
return result;
}
//
// Check if the current character follows a matching character, with possible "filler" between.
// For example, this checks for empty curly braces, e.g.
//
// in.eq('}') & follows(in.eq('['), in.eq(' '), prev_empty_array) // { <whitespace>* }
//
really_inline uint64_t follows(const uint64_t match, const uint64_t filler, uint64_t &overflow) {
uint64_t follows_match = follows(match, overflow);
uint64_t result;
overflow |= uint64_t(add_overflow(follows_match, filler, &result));
return result;
}
really_inline json_block json_scanner::next(const simd::simd8x64<uint8_t> in) {
json_string_block strings = string_scanner.next(in);
json_character_block characters = json_character_block::classify(in);
uint64_t follows_scalar = follows(characters.scalar(), prev_scalar);
return {
strings,
characters,
follows_scalar
};
}
really_inline error_code json_scanner::finish(bool streaming) {
return string_scanner.finish(streaming);
}
} // namespace stage1
/* end file src/generic/stage1/json_scanner.h */
namespace stage1 {
really_inline uint64_t json_string_scanner::find_escaped(uint64_t backslash) {
if (!backslash) { uint64_t escaped = prev_escaped; prev_escaped = 0; return escaped; }
return find_escaped_branchless(backslash);
}
}
/* begin file src/generic/stage1/json_minifier.h */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace stage1 {
class json_minifier {
public:
template<size_t STEP_SIZE>
static error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept;
private:
really_inline json_minifier(uint8_t *_dst)
: dst{_dst}
{}
template<size_t STEP_SIZE>
really_inline void step(const uint8_t *block_buf, buf_block_reader<STEP_SIZE> &reader) noexcept;
really_inline void next(simd::simd8x64<uint8_t> in, json_block block);
really_inline error_code finish(uint8_t *dst_start, size_t &dst_len);
json_scanner scanner{};
uint8_t *dst;
};
really_inline void json_minifier::next(simd::simd8x64<uint8_t> in, json_block block) {
uint64_t mask = block.whitespace();
in.compress(mask, dst);
dst += 64 - count_ones(mask);
}
really_inline error_code json_minifier::finish(uint8_t *dst_start, size_t &dst_len) {
*dst = '\0';
error_code error = scanner.finish(false);
if (error) { dst_len = 0; return error; }
dst_len = dst - dst_start;
return SUCCESS;
}
template<>
really_inline void json_minifier::step<128>(const uint8_t *block_buf, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
simd::simd8x64<uint8_t> in_2(block_buf+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1);
this->next(in_2, block_2);
reader.advance();
}
template<>
really_inline void json_minifier::step<64>(const uint8_t *block_buf, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
json_block block_1 = scanner.next(in_1);
this->next(block_buf, block_1);
reader.advance();
}
template<size_t STEP_SIZE>
error_code json_minifier::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept {
buf_block_reader<STEP_SIZE> reader(buf, len);
json_minifier minifier(dst);
// Index the first n-1 blocks
while (reader.has_full_block()) {
minifier.step<STEP_SIZE>(reader.full_block(), reader);
}
// Index the last (remainder) block, padded with spaces
uint8_t block[STEP_SIZE];
if (likely(reader.get_remainder(block)) > 0) {
minifier.step<STEP_SIZE>(block, reader);
}
return minifier.finish(dst, dst_len);
}
} // namespace stage1
/* end file src/generic/stage1/json_minifier.h */
WARN_UNUSED error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
return haswell::stage1::json_minifier::minify<128>(buf, len, dst, dst_len);
}
/* begin file src/generic/stage1/find_next_document_index.h */
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ';' ','
* and when the second element is NOT one of these characters: '}' '}' ';' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
really_inline static uint32_t find_next_document_index(dom_parser_implementation &parser) {
// TODO don't count separately, just figure out depth
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
return 0;
}
// Skip the last character if it is partial
really_inline static size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0b11100000) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0b11100000) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0b11110000) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
/* end file src/generic/stage1/find_next_document_index.h */
/* begin file src/generic/stage1/utf8_lookup3_algorithm.h */
//
// Detect Unicode errors.
//
// UTF-8 is designed to allow multiple bytes and be compatible with ASCII. It's a fairly basic
// encoding that uses the first few bits on each byte to denote a "byte type", and all other bits
// are straight up concatenated into the final value. The first byte of a multibyte character is a
// "leading byte" and starts with N 1's, where N is the total number of bytes (110_____ = 2 byte
// lead). The remaining bytes of a multibyte character all start with 10. 1-byte characters just
// start with 0, because that's what ASCII looks like. Here's what each size looks like:
//
// - ASCII (7 bits): 0_______
// - 2 byte character (11 bits): 110_____ 10______
// - 3 byte character (17 bits): 1110____ 10______ 10______
// - 4 byte character (23 bits): 11110___ 10______ 10______ 10______
// - 5+ byte character (illegal): 11111___ <illegal>
//
// There are 5 classes of error that can happen in Unicode:
//
// - TOO_SHORT: when you have a multibyte character with too few bytes (i.e. missing continuation).
// We detect this by looking for new characters (lead bytes) inside the range of a multibyte
// character.
//
// e.g. 11000000 01100001 (2-byte character where second byte is ASCII)
//
// - TOO_LONG: when there are more bytes in your character than you need (i.e. extra continuation).
// We detect this by requiring that the next byte after your multibyte character be a new
// character--so a continuation after your character is wrong.
//
// e.g. 11011111 10111111 10111111 (2-byte character followed by *another* continuation byte)
//
// - TOO_LARGE: Unicode only goes up to U+10FFFF. These characters are too large.
//
// e.g. 11110111 10111111 10111111 10111111 (bigger than 10FFFF).
//
// - OVERLONG: multibyte characters with a bunch of leading zeroes, where you could have
// used fewer bytes to make the same character. Like encoding an ASCII character in 4 bytes is
// technically possible, but UTF-8 disallows it so that there is only one way to write an "a".
//
// e.g. 11000001 10100001 (2-byte encoding of "a", which only requires 1 byte: 01100001)
//
// - SURROGATE: Unicode U+D800-U+DFFF is a *surrogate* character, reserved for use in UCS-2 and
// WTF-8 encodings for characters with > 2 bytes. These are illegal in pure UTF-8.
//
// e.g. 11101101 10100000 10000000 (U+D800)
//
// - INVALID_5_BYTE: 5-byte, 6-byte, 7-byte and 8-byte characters are unsupported; Unicode does not
// support values with more than 23 bits (which a 4-byte character supports).
//
// e.g. 11111000 10100000 10000000 10000000 10000000 (U+800000)
//
// Legal utf-8 byte sequences per http://www.unicode.org/versions/Unicode6.0.0/ch03.pdf - page 94:
//
// Code Points 1st 2s 3s 4s
// U+0000..U+007F 00..7F
// U+0080..U+07FF C2..DF 80..BF
// U+0800..U+0FFF E0 A0..BF 80..BF
// U+1000..U+CFFF E1..EC 80..BF 80..BF
// U+D000..U+D7FF ED 80..9F 80..BF
// U+E000..U+FFFF EE..EF 80..BF 80..BF
// U+10000..U+3FFFF F0 90..BF 80..BF 80..BF
// U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
// U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
//
using namespace simd;
namespace utf8_validation {
// For a detailed description of the lookup2 algorithm, see the file HACKING.md under "UTF-8 validation (lookup2)".
//
// Find special case UTF-8 errors where the character is technically readable (has the right length)
// but the *value* is disallowed.
//
// This includes overlong encodings, surrogates and values too large for Unicode.
//
// It turns out the bad character ranges can all be detected by looking at the first 12 bits of the
// UTF-8 encoded character (i.e. all of byte 1, and the high 4 bits of byte 2). This algorithm does a
// 3 4-bit table lookups, identifying which errors that 4 bits could match, and then &'s them together.
// If all 3 lookups detect the same error, it's an error.
//
really_inline simd8<uint8_t> check_special_cases(const simd8<uint8_t> input, const simd8<uint8_t> prev1) {
//
// These are the errors we're going to match for bytes 1-2, by looking at the first three
// nibbles of the character: <high bits of byte 1>> & <low bits of byte 1> & <high bits of byte 2>
//
static const int OVERLONG_2 = 0x01; // 1100000_ 10______ (technically we match 10______ but we could match ________, they both yield errors either way)
static const int OVERLONG_3 = 0x02; // 11100000 100_____ ________
static const int OVERLONG_4 = 0x04; // 11110000 1000____ ________ ________
static const int SURROGATE = 0x08; // 11101101 [101_]____
static const int TOO_LARGE = 0x10; // 11110100 (1001|101_)____
static const int TOO_LARGE_2 = 0x20; // 1111(1___|011_|0101) 10______
// New with lookup3. We want to catch the case where an non-continuation
// follows a leading byte
static const int TOO_SHORT_2_3_4 = 0x40; // (110_|1110|1111) ____ (0___|110_|1111) ____
// We also want to catch a continuation that is preceded by an ASCII byte
static const int LONELY_CONTINUATION = 0x80; // 0___ ____ 01__ ____
// After processing the rest of byte 1 (the low bits), we're still not done--we have to check
// byte 2 to be sure which things are errors and which aren't.
// Since high_bits is byte 5, byte 2 is high_bits.prev<3>
static const int CARRY = OVERLONG_2 | TOO_LARGE_2;
const simd8<uint8_t> byte_2_high = input.shr<4>().lookup_16<uint8_t>(
// ASCII: ________ [0___]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
// ASCII: ________ [0___]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
// Continuations: ________ [10__]____
CARRY | OVERLONG_3 | OVERLONG_4 | LONELY_CONTINUATION, // ________ [1000]____
CARRY | OVERLONG_3 | TOO_LARGE | LONELY_CONTINUATION, // ________ [1001]____
CARRY | TOO_LARGE | SURROGATE | LONELY_CONTINUATION, // ________ [1010]____
CARRY | TOO_LARGE | SURROGATE | LONELY_CONTINUATION, // ________ [1011]____
// Multibyte Leads: ________ [11__]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4, // 110_
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4
);
const simd8<uint8_t> byte_1_high = prev1.shr<4>().lookup_16<uint8_t>(
// [0___]____ (ASCII)
LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION,
LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION,
// [10__]____ (continuation)
0, 0, 0, 0,
// [11__]____ (2+-byte leads)
OVERLONG_2 | TOO_SHORT_2_3_4, TOO_SHORT_2_3_4, // [110_]____ (2-byte lead)
OVERLONG_3 | SURROGATE | TOO_SHORT_2_3_4, // [1110]____ (3-byte lead)
OVERLONG_4 | TOO_LARGE | TOO_LARGE_2 | TOO_SHORT_2_3_4 // [1111]____ (4+-byte lead)
);
const simd8<uint8_t> byte_1_low = (prev1 & 0x0F).lookup_16<uint8_t>(
// ____[00__] ________
OVERLONG_2 | OVERLONG_3 | OVERLONG_4 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0000] ________
OVERLONG_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0001] ________
TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[01__] ________
TOO_LARGE | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0100] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[10__] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[11__] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | SURROGATE | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[1101] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4| LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION
);
return byte_1_high & byte_1_low & byte_2_high;
}
really_inline simd8<uint8_t> check_multibyte_lengths(simd8<uint8_t> input, simd8<uint8_t> prev_input,
simd8<uint8_t> prev1) {
simd8<uint8_t> prev2 = input.prev<2>(prev_input);
simd8<uint8_t> prev3 = input.prev<3>(prev_input);
// is_2_3_continuation uses one more instruction than lookup2
simd8<bool> is_2_3_continuation = (simd8<int8_t>(input).max(simd8<int8_t>(prev1))) < int8_t(-64);
// must_be_2_3_continuation has two fewer instructions than lookup 2
return simd8<uint8_t>(must_be_2_3_continuation(prev2, prev3) ^ is_2_3_continuation);
}
//
// Return nonzero if there are incomplete multibyte characters at the end of the block:
// e.g. if there is a 4-byte character, but it's 3 bytes from the end.
//
really_inline simd8<uint8_t> is_incomplete(simd8<uint8_t> input) {
// If the previous input's last 3 bytes match this, they're too short (they ended at EOF):
// ... 1111____ 111_____ 11______
static const uint8_t max_array[32] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0b11110000u-1, 0b11100000u-1, 0b11000000u-1
};
const simd8<uint8_t> max_value(&max_array[sizeof(max_array)-sizeof(simd8<uint8_t>)]);
return input.gt_bits(max_value);
}
struct utf8_checker {
// If this is nonzero, there has been a UTF-8 error.
simd8<uint8_t> error;
// The last input we received
simd8<uint8_t> prev_input_block;
// Whether the last input we received was incomplete (used for ASCII fast path)
simd8<uint8_t> prev_incomplete;
//
// Check whether the current bytes are valid UTF-8.
//
really_inline void check_utf8_bytes(const simd8<uint8_t> input, const simd8<uint8_t> prev_input) {
// Flip prev1...prev3 so we can easily determine if they are 2+, 3+ or 4+ lead bytes
// (2, 3, 4-byte leads become large positive numbers instead of small negative numbers)
simd8<uint8_t> prev1 = input.prev<1>(prev_input);
this->error |= check_special_cases(input, prev1);
this->error |= check_multibyte_lengths(input, prev_input, prev1);
}
// The only problem that can happen at EOF is that a multibyte character is too short.
really_inline void check_eof() {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
}
really_inline void check_next_input(simd8x64<uint8_t> input) {
if (likely(is_ascii(input))) {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
} else {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
for (int i=1; i<simd8x64<uint8_t>::NUM_CHUNKS; i++) {
this->check_utf8_bytes(input.chunks[i], input.chunks[i-1]);
}
this->prev_incomplete = is_incomplete(input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1]);
this->prev_input_block = input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1];
}
}
really_inline error_code errors() {
return this->error.any_bits_set_anywhere() ? simdjson::UTF8_ERROR : simdjson::SUCCESS;
}
}; // struct utf8_checker
}
using utf8_validation::utf8_checker;
/* end file src/generic/stage1/utf8_lookup3_algorithm.h */
/* begin file src/generic/stage1/json_structural_indexer.h */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace stage1 {
class bit_indexer {
public:
uint32_t *tail;
really_inline bit_indexer(uint32_t *index_buf) : tail(index_buf) {}
// flatten out values in 'bits' assuming that they are are to have values of idx
// plus their position in the bitvector, and store these indexes at
// base_ptr[base] incrementing base as we go
// will potentially store extra values beyond end of valid bits, so base_ptr
// needs to be large enough to handle this
really_inline void write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0)
return;
int cnt = static_cast<int>(count_ones(bits));
// Do the first 8 all together
for (int i=0; i<8; i++) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
// Do the next 8 all together (we hope in most cases it won't happen at all
// and the branch is easily predicted).
if (unlikely(cnt > 8)) {
for (int i=8; i<16; i++) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
// Most files don't have 16+ structurals per block, so we take several basically guaranteed
// branch mispredictions here. 16+ structurals per block means either punctuation ({} [] , :)
// or the start of a value ("abc" true 123) every four characters.
if (unlikely(cnt > 16)) {
int i = 16;
do {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
i++;
} while (i < cnt);
}
}
this->tail += cnt;
}
};
class json_structural_indexer {
public:
/**
* Find the important bits of JSON in a 128-byte chunk, and add them to structural_indexes.
*
* @param partial Setting the partial parameter to true allows the find_structural_bits to
* tolerate unclosed strings. The caller should still ensure that the input is valid UTF-8. If
* you are processing substrings, you may want to call on a function like trimmed_length_safe_utf8.
*/
template<size_t STEP_SIZE>
static error_code index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, bool partial) noexcept;
private:
really_inline json_structural_indexer(uint32_t *structural_indexes);
template<size_t STEP_SIZE>
really_inline void step(const uint8_t *block, buf_block_reader<STEP_SIZE> &reader) noexcept;
really_inline void next(simd::simd8x64<uint8_t> in, json_block block, size_t idx);
really_inline error_code finish(dom_parser_implementation &parser, size_t idx, size_t len, bool partial);
json_scanner scanner{};
utf8_checker checker{};
bit_indexer indexer;
uint64_t prev_structurals = 0;
uint64_t unescaped_chars_error = 0;
};
really_inline json_structural_indexer::json_structural_indexer(uint32_t *structural_indexes) : indexer{structural_indexes} {}
//
// PERF NOTES:
// We pipe 2 inputs through these stages:
// 1. Load JSON into registers. This takes a long time and is highly parallelizable, so we load
// 2 inputs' worth at once so that by the time step 2 is looking for them input, it's available.
// 2. Scan the JSON for critical data: strings, scalars and operators. This is the critical path.
// The output of step 1 depends entirely on this information. These functions don't quite use
// up enough CPU: the second half of the functions is highly serial, only using 1 execution core
// at a time. The second input's scans has some dependency on the first ones finishing it, but
// they can make a lot of progress before they need that information.
// 3. Step 1 doesn't use enough capacity, so we run some extra stuff while we're waiting for that
// to finish: utf-8 checks and generating the output from the last iteration.
//
// The reason we run 2 inputs at a time, is steps 2 and 3 are *still* not enough to soak up all
// available capacity with just one input. Running 2 at a time seems to give the CPU a good enough
// workout.
//
template<size_t STEP_SIZE>
error_code json_structural_indexer::index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, bool partial) noexcept {
if (unlikely(len > parser.capacity())) { return CAPACITY; }
if (partial) { len = trim_partial_utf8(buf, len); }
buf_block_reader<STEP_SIZE> reader(buf, len);
json_structural_indexer indexer(parser.structural_indexes.get());
// Read all but the last block
while (reader.has_full_block()) {
indexer.step<STEP_SIZE>(reader.full_block(), reader);
}
// Take care of the last block (will always be there unless file is empty)
uint8_t block[STEP_SIZE];
if (unlikely(reader.get_remainder(block) == 0)) { return EMPTY; }
indexer.step<STEP_SIZE>(block, reader);
return indexer.finish(parser, reader.block_index(), len, partial);
}
template<>
really_inline void json_structural_indexer::step<128>(const uint8_t *block, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
simd::simd8x64<uint8_t> in_2(block+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1, reader.block_index());
this->next(in_2, block_2, reader.block_index()+64);
reader.advance();
}
template<>
really_inline void json_structural_indexer::step<64>(const uint8_t *block, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
json_block block_1 = scanner.next(in_1);
this->next(in_1, block_1, reader.block_index());
reader.advance();
}
really_inline void json_structural_indexer::next(simd::simd8x64<uint8_t> in, json_block block, size_t idx) {
uint64_t unescaped = in.lteq(0x1F);
checker.check_next_input(in);
indexer.write(uint32_t(idx-64), prev_structurals); // Output *last* iteration's structurals to the parser
prev_structurals = block.structural_start();
unescaped_chars_error |= block.non_quote_inside_string(unescaped);
}
really_inline error_code json_structural_indexer::finish(dom_parser_implementation &parser, size_t idx, size_t len, bool partial) {
// Write out the final iteration's structurals
indexer.write(uint32_t(idx-64), prev_structurals);
error_code error = scanner.finish(partial);
if (unlikely(error != SUCCESS)) { return error; }
if (unescaped_chars_error) {
return UNESCAPED_CHARS;
}
parser.n_structural_indexes = uint32_t(indexer.tail - parser.structural_indexes.get());
/***
* This is related to https://github.com/simdjson/simdjson/issues/906
* Basically, we want to make sure that if the parsing continues beyond the last (valid)
* structural character, it quickly stops.
* Only three structural characters can be repeated without triggering an error in JSON: [,] and }.
* We repeat the padding character (at 'len'). We don't know what it is, but if the parsing
* continues, then it must be [,] or }.
* Suppose it is ] or }. We backtrack to the first character, what could it be that would
* not trigger an error? It could be ] or } but no, because you can't start a document that way.
* It can't be a comma, a colon or any simple value. So the only way we could continue is
* if the repeated character is [. But if so, the document must start with [. But if the document
* starts with [, it should end with ]. If we enforce that rule, then we would get
* ][[ which is invalid.
**/
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 1] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 2] = 0;
parser.next_structural_index = 0;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (unlikely(parser.n_structural_indexes == 0u)) {
return EMPTY;
}
if (unlikely(parser.structural_indexes[parser.n_structural_indexes - 1] > len)) {
return UNEXPECTED_ERROR;
}
if (partial) {
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
return CAPACITY; // If the buffer is partial but the document is incomplete, it's too big to parse.
}
parser.n_structural_indexes = new_structural_indexes;
}
return checker.errors();
}
} // namespace stage1
/* end file src/generic/stage1/json_structural_indexer.h */
WARN_UNUSED error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, bool streaming) noexcept {
this->buf = _buf;
this->len = _len;
return haswell::stage1::json_structural_indexer::index<128>(_buf, _len, *this, streaming);
}
/* begin file src/generic/stage1/utf8_validator.h */
namespace stage1 {
/**
* Validates that the string is actual UTF-8.
*/
template<class checker>
bool generic_validate_utf8(const uint8_t * input, size_t length) {
checker c{};
buf_block_reader<64> reader(input, length);
while (reader.has_full_block()) {
simd::simd8x64<uint8_t> in(reader.full_block());
c.check_next_input(in);
reader.advance();
}
uint8_t block[64]{};
reader.get_remainder(block);
simd::simd8x64<uint8_t> in(block);
c.check_next_input(in);
reader.advance();
return c.errors() == error_code::SUCCESS;
}
bool generic_validate_utf8(const char * input, size_t length) {
return generic_validate_utf8<utf8_checker>((const uint8_t *)input,length);
}
} // namespace stage1
/* end file src/generic/stage1/utf8_validator.h */
WARN_UNUSED bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
return simdjson::haswell::stage1::generic_validate_utf8(buf,len);
}
} // namespace haswell
} // namespace simdjson
UNTARGET_REGION
//
// Stage 2
//
/* begin file src/haswell/stringparsing.h */
#ifndef SIMDJSON_HASWELL_STRINGPARSING_H
#define SIMDJSON_HASWELL_STRINGPARSING_H
/* jsoncharutils.h already included: #include "jsoncharutils.h" */
/* haswell/simd.h already included: #include "haswell/simd.h" */
/* haswell/intrinsics.h already included: #include "haswell/intrinsics.h" */
/* haswell/bitmanipulation.h already included: #include "haswell/bitmanipulation.h" */
TARGET_HASWELL
namespace simdjson {
namespace haswell {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
really_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
really_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
really_inline bool has_backslash() { return ((quote_bits - 1) & bs_bits) != 0; }
really_inline int quote_index() { return trailing_zeroes(quote_bits); }
really_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 15 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v(src);
// store to dest unconditionally - we can overwrite the bits we don't like later
v.store(dst);
return {
(uint32_t)(v == '\\').to_bitmask(), // bs_bits
(uint32_t)(v == '"').to_bitmask(), // quote_bits
};
}
/* begin file src/generic/stage2/stringparsing.h */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is include already includes
// "stringparsing.h" (this simplifies amalgation)
namespace stage2 {
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
WARN_UNUSED
really_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion isn't valid; we defer the check for this to inside the
// multilingual plane check
uint32_t code_point = hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// check for low surrogate for characters outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
if (((*src_ptr)[0] != '\\') || (*src_ptr)[1] != 'u') {
return false;
}
uint32_t code_point_2 = hex_to_u32_nocheck(*src_ptr + 2);
// if the first code point is invalid we will get here, as we will go past
// the check for being outside the Basic Multilingual plane. If we don't
// find a \u immediately afterwards we fail out anyhow, but if we do,
// this check catches both the case of the first code point being invalid
// or the second code point being invalid.
if ((code_point | code_point_2) >> 16) {
return false;
}
code_point =
(((code_point - 0xd800) << 10) | (code_point_2 - 0xdc00)) + 0x10000;
*src_ptr += 6;
}
size_t offset = codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
WARN_UNUSED really_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst) {
src++;
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
/* can't be reached */
return nullptr;
}
} // namespace stringparsing
} // namespace stage2
/* end file src/generic/stage2/stringparsing.h */
} // namespace haswell
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_HASWELL_STRINGPARSING_H
/* end file src/generic/stage2/stringparsing.h */
/* begin file src/haswell/numberparsing.h */
#ifndef SIMDJSON_HASWELL_NUMBERPARSING_H
#define SIMDJSON_HASWELL_NUMBERPARSING_H
/* jsoncharutils.h already included: #include "jsoncharutils.h" */
/* haswell/intrinsics.h already included: #include "haswell/intrinsics.h" */
/* haswell/bitmanipulation.h already included: #include "haswell/bitmanipulation.h" */
#include <cmath>
#include <limits>
#ifdef JSON_TEST_NUMBERS // for unit testing
void found_invalid_number(const uint8_t *buf);
void found_integer(int64_t result, const uint8_t *buf);
void found_unsigned_integer(uint64_t result, const uint8_t *buf);
void found_float(double result, const uint8_t *buf);
#endif
TARGET_HASWELL
namespace simdjson {
namespace haswell {
static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
// this actually computes *16* values so we are being wasteful.
const __m128i ascii0 = _mm_set1_epi8('0');
const __m128i mul_1_10 =
_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
const __m128i mul_1_10000 =
_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
const __m128i input = _mm_sub_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
const __m128i t3 = _mm_packus_epi32(t2, t2);
const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
return _mm_cvtsi128_si32(
t4); // only captures the sum of the first 8 digits, drop the rest
}
#define SWAR_NUMBER_PARSING
/* begin file src/generic/stage2/numberparsing.h */
namespace stage2 {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), false)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), writer.append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), writer.append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), writer.append_double((VALUE)))
#else
#define INVALID_NUMBER(SRC) (false)
#define WRITE_INTEGER(VALUE, SRC, WRITER) writer.append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) writer.append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) writer.append_double((VALUE))
#endif
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [FASTFLOAT_SMALLEST_POWER,
// FASTFLOAT_LARGEST_POWER] interval: the caller is responsible for this check.
really_inline double compute_float_64(int64_t power, uint64_t i, bool negative, bool *success) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991) {
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991) {
#endif
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
double d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / power_of_ten[-power];
} else {
d = d * power_of_ten[power];
}
if (negative) {
d = -d;
}
*success = true;
return d;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It wa
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
return 0.0;
}
// We are going to need to do some 64-bit arithmetic to get a more precise product.
// We use a table lookup approach.
components c =
power_of_ten_components[power - FASTFLOAT_SMALLEST_POWER];
// safe because
// power >= FASTFLOAT_SMALLEST_POWER
// and power <= FASTFLOAT_LARGEST_POWER
// we recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
uint64_t factor_mantissa = c.mantissa;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
value128 product = full_multiplication(i, factor_mantissa);
uint64_t lower = product.low;
uint64_t upper = product.high;
// We know that upper has at most one leading zero because
// both i and factor_mantissa have a leading one. This means
// that the result is at least as large as ((1<<63)*(1<<63))/(1<<64).
// As long as the first 9 bits of "upper" are not "1", then we
// know that we have an exact computed value for the leading
// 55 bits because any imprecision would play out as a +1, in
// the worst case.
if (unlikely((upper & 0x1FF) == 0x1FF) && (lower + i < lower)) {
uint64_t factor_mantissa_low =
mantissa_128[power - FASTFLOAT_SMALLEST_POWER];
// next, we compute the 64-bit x 128-bit multiplication, getting a 192-bit
// result (three 64-bit values)
product = full_multiplication(i, factor_mantissa_low);
uint64_t product_low = product.low;
uint64_t product_middle2 = product.high;
uint64_t product_middle1 = lower;
uint64_t product_high = upper;
uint64_t product_middle = product_middle1 + product_middle2;
if (product_middle < product_middle1) {
product_high++; // overflow carry
}
// We want to check whether mantissa *i + i would affect our result.
// This does happen, e.g. with 7.3177701707893310e+15.
if (((product_middle + 1 == 0) && ((product_high & 0x1FF) == 0x1FF) &&
(product_low + i < product_low))) { // let us be prudent and bail out.
*success = false;
return 0;
}
upper = product_high;
lower = product_middle;
}
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
if (unlikely((lower == 0) && ((upper & 0x1FF) == 0) &&
((mantissa & 3) == 1))) {
// if mantissa & 1 == 1 we might need to round up.
//
// Scenarios:
// 1. We are not in the middle. Then we should round up.
//
// 2. We are right in the middle. Whether we round up depends
// on the last significant bit: if it is "one" then we round
// up (round to even) otherwise, we do not.
//
// So if the last significant bit is 1, we can safely round up.
// Hence we only need to bail out if (mantissa & 3) == 1.
// Otherwise we may need more accuracy or analysis to determine whether
// we are exactly between two floating-point numbers.
// It can be triggered with 1e23.
// Note: because the factor_mantissa and factor_mantissa_low are
// almost always rounded down (except for small positive powers),
// almost always should round up.
*success = false;
return 0;
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
lz--; // undo previous addition
}
mantissa &= ~(1ULL << 52);
uint64_t real_exponent = c.exp - lz;
// we have to check that real_exponent is in range, otherwise we bail out
if (unlikely((real_exponent < 1) || (real_exponent > 2046))) {
*success = false;
return 0;
}
mantissa |= real_exponent << 52;
mantissa |= (((uint64_t)negative) << 63);
double d;
memcpy(&d, &mantissa, sizeof(d));
*success = true;
return d;
}
static bool parse_float_strtod(const char *ptr, double *outDouble) {
char *endptr;
*outDouble = strtod(ptr, &endptr);
// Some libraries will set errno = ERANGE when the value is subnormal,
// yet we may want to be able to parse subnormal values.
// However, we do not want to tolerate NAN or infinite values.
//
// Values like infinity or NaN are not allowed in the JSON specification.
// If you consume a large value and you map it to "infinity", you will no
// longer be able to serialize back a standard-compliant JSON. And there is
// no realistic application where you might need values so large than they
// can't fit in binary64. The maximal value is about 1.7976931348623157 x
// 10^308 It is an unimaginable large number. There will never be any piece of
// engineering involving as many as 10^308 parts. It is estimated that there
// are about 10^80 atoms in the universe. The estimate for the total number
// of electrons is similar. Using a double-precision floating-point value, we
// can represent easily the number of atoms in the universe. We could also
// represent the number of ways you can pick any three individual atoms at
// random in the universe. If you ever encounter a number much larger than
// 10^308, you know that you have a bug. RapidJSON will reject a document with
// a float that does not fit in binary64. JSON for Modern C++ (nlohmann/json)
// will flat out throw an exception.
//
if ((endptr == ptr) || (!std::isfinite(*outDouble))) {
return false;
}
return true;
}
really_inline bool is_integer(char c) {
return (c >= '0' && c <= '9');
// this gets compiled to (uint8_t)(c - '0') <= 9 on all decent compilers
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
really_inline bool is_made_of_eight_digits_fast(const char *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename W>
bool slow_float_parsing(UNUSED const char * src, W writer) {
double d;
if (parse_float_strtod(src, &d)) {
WRITE_DOUBLE(d, (const uint8_t *)src, writer);
return true;
}
return INVALID_NUMBER((const uint8_t *)src);
}
really_inline bool parse_decimal(UNUSED const uint8_t *const src, const char *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const char *const first_after_period = p;
if (!is_integer(*p)) { return INVALID_NUMBER(src); } // There must be at least one digit after the .
unsigned char digit = static_cast<unsigned char>(*p - '0');
++p;
i = i * 10 + digit; // might overflow + multiplication by 10 is likely
// cheaper than arbitrary mult.
// we will handle the overflow later
#ifdef SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif
while (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
++p;
i = i * 10 + digit; // in rare cases, this will overflow, but that's ok
// because we have parse_highprecision_float later.
}
exponent = first_after_period - p;
return true;
}
really_inline bool parse_exponent(UNUSED const uint8_t *const src, const char *&p, int64_t &exponent) {
bool neg_exp = false;
if ('-' == *p) {
neg_exp = true;
++p;
} else if ('+' == *p) {
++p;
}
// e[+-] must be followed by a number
if (!is_integer(*p)) { return INVALID_NUMBER(src); }
unsigned char digit = static_cast<unsigned char>(*p - '0');
int64_t exp_number = digit;
p++;
if (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
if (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
while (is_integer(*p)) {
// we need to check for overflows; we refuse to parse this
if (exp_number > 0x100000000) { return INVALID_NUMBER(src); }
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
exponent += (neg_exp ? -exp_number : exp_number);
return true;
}
template<typename W>
really_inline bool write_float(const uint8_t *const src, bool negative, uint64_t i, const char * start_digits, int digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
// digit count is off by 1 because of the decimal (assuming there was one).
if (unlikely((digit_count-1 >= 19))) { // this is uncommon
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const char *start = start_digits;
while ((*start == '0') || (*start == '.')) {
start++;
}
// we over-decrement by one when there is a '.'
digit_count -= int(start - start_digits);
if (digit_count >= 19) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
bool success = slow_float_parsing((const char *) src, writer);
// The number was already written, but we made a copy of the writer
// when we passed it to the parse_large_integer() function, so
writer.skip_double();
return success;
}
}
// NOTE: it's weird that the unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (unlikely(exponent < FASTFLOAT_SMALLEST_POWER) || (exponent > FASTFLOAT_LARGEST_POWER)) {
// this is almost never going to get called!!!
// we start anew, going slowly!!!
bool success = slow_float_parsing((const char *) src, writer);
// The number was already written, but we made a copy of the writer when we passed it to the
// slow_float_parsing() function, so we have to skip those tape spots now that we've returned
writer.skip_double();
return success;
}
bool success = true;
double d = compute_float_64(exponent, i, negative, &success);
if (!success) {
// we are almost never going to get here.
if (!parse_float_strtod((const char *)src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return true;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
really_inline bool parse_number(UNUSED const uint8_t *const src,
UNUSED bool found_minus,
W &writer) {
#ifdef SIMDJSON_SKIPNUMBERPARSING // for performance analysis, it is sometimes
// useful to skip parsing
writer.append_s64(0); // always write zero
return true; // always succeeds
#else
const char *p = reinterpret_cast<const char *>(src);
bool negative = false;
if (found_minus) {
++p;
negative = true;
// a negative sign must be followed by an integer
if (!is_integer(*p)) { return INVALID_NUMBER(src); }
}
const char *const start_digits = p;
uint64_t i; // an unsigned int avoids signed overflows (which are bad)
if (*p == '0') {
++p;
if (is_integer(*p)) { return INVALID_NUMBER(src); } // 0 cannot be followed by an integer
i = 0;
} else {
// NOTE: This is a redundant check--either we're negative, in which case we checked whether this
// is a digit above, or the caller already determined we start with a digit. But removing this
// check seems to make things slower: https://github.com/simdjson/simdjson/pull/990#discussion_r448512448
// Please do try yourself, or think of ways to explain it--we'd love to understand :)
if (!is_integer(*p)) { return INVALID_NUMBER(src); } // must start with an integer
unsigned char digit = static_cast<unsigned char>(*p - '0');
i = digit;
p++;
// the is_made_of_eight_digits_fast routine is unlikely to help here because
// we rarely see large integer parts like 123456789
while (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
// a multiplication by 10 is cheaper than an arbitrary integer
// multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
++p;
}
}
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
if (!parse_decimal(src, p, i, exponent)) { return false; }
}
int digit_count = int(p - start_digits); // used later to guard against overflows
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
if (!parse_exponent(src, p, exponent)) { return false; }
}
if (is_float) {
return write_float(src, negative, i, start_digits, digit_count, exponent, writer);
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
int longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return INVALID_NUMBER(src); }
if (digit_count == longest_digit_count) {
// Anything negative above INT64_MAX is either invalid or INT64_MIN.
if (negative && i > uint64_t(INT64_MAX)) {
// If the number is negative and can't fit in a signed integer, it's invalid.
if (i > uint64_t(INT64_MAX)+1) { return INVALID_NUMBER(src); }
// If it's negative, it has to be INT64_MAX+1 now (or INT64_MIN).
// C++ can't reliably negate uint64_t INT64_MIN, it seems. Special case it.
WRITE_INTEGER(INT64_MIN, src, writer);
return is_structural_or_whitespace(*p);
}
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to 9,223,372,036,854,775,808 (INT64_MAX).
//
if (!negative && (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX))) { return INVALID_NUMBER(src); }
}
// Write unsigned if it doesn't fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? 0 - i : i, src, writer);
}
return is_structural_or_whitespace(*p);
#endif // SIMDJSON_SKIPNUMBERPARSING
}
} // namespace numberparsing
} // namespace stage2
/* end file src/generic/stage2/numberparsing.h */
} // namespace haswell
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_HASWELL_NUMBERPARSING_H
/* end file src/generic/stage2/numberparsing.h */
TARGET_HASWELL
namespace simdjson {
namespace haswell {
/* begin file src/generic/stage2/logger.h */
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
static constexpr const bool LOG_ENABLED = false;
static constexpr const int LOG_EVENT_LEN = 30;
static constexpr const int LOG_BUFFER_LEN = 20;
static constexpr const int LOG_DETAIL_LEN = 50;
static constexpr const int LOG_INDEX_LEN = 10;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static really_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static really_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %*s | %*s | %*s | %-*s | %-*s | %-*s |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", 4, "Curr", 4, "Next", 5, "Next#", 5, "Tape#", LOG_DETAIL_LEN, "Detail", LOG_INDEX_LEN, "index");
printf("|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, 4+2, DASHES, 4+2, DASHES, 5+2, DASHES, 5+2, DASHES, LOG_DETAIL_LEN+2, DASHES, LOG_INDEX_LEN+2, DASHES);
}
}
static really_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line of
template<typename S>
static really_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(structurals.current()[i]));
}
printf(" ");
}
printf("| %c ", printable_char(structurals.current_char()));
printf("| %c ", printable_char(structurals.peek_next_char()));
printf("| %5u ", structurals.parser.structural_indexes[*(structurals.current_structural+1)]);
printf("| %5u ", structurals.next_tape_index());
printf("| %-*s ", LOG_DETAIL_LEN, detail);
printf("| %*u ", LOG_INDEX_LEN, *structurals.current_structural);
printf("|\n");
}
}
} // namespace logger
/* end file src/generic/stage2/logger.h */
/* begin file src/generic/stage2/atomparsing.h */
namespace stage2 {
namespace atomparsing {
really_inline uint32_t string_to_uint32(const char* str) { return *reinterpret_cast<const uint32_t *>(str); }
WARN_UNUSED
really_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 64-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | is_not_structural_or_whitespace(src[5])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // namespace stage2
/* end file src/generic/stage2/atomparsing.h */
/* begin file src/generic/stage2/structural_iterator.h */
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *current_structural;
dom_parser_implementation &parser;
// Start a structural
really_inline structural_iterator(dom_parser_implementation &_parser, size_t start_structural_index)
: buf{_parser.buf},
current_structural{&_parser.structural_indexes[start_structural_index]},
parser{_parser} {
}
// Get the buffer position of the current structural character
really_inline const uint8_t* current() {
return &buf[*current_structural];
}
// Get the current structural character
really_inline char current_char() {
return buf[*current_structural];
}
// Get the next structural character without advancing
really_inline char peek_next_char() {
return buf[*(current_structural+1)];
}
really_inline char advance_char() {
current_structural++;
return buf[*current_structural];
}
really_inline size_t remaining_len() {
return parser.len - *current_structural;
}
really_inline bool past_end(uint32_t n_structural_indexes) {
return current_structural >= &parser.structural_indexes[n_structural_indexes];
}
really_inline bool at_end(uint32_t n_structural_indexes) {
return current_structural == &parser.structural_indexes[n_structural_indexes];
}
really_inline bool at_beginning() {
return current_structural == parser.structural_indexes.get();
}
};
} // namespace stage2
/* end file src/generic/stage2/structural_iterator.h */
/* begin file src/generic/stage2/structural_parser.h */
// This file contains the common code every implementation uses for stage2
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is include already includes
// "simdjson/stage2.h" (this simplifies amalgation)
namespace stage2 {
namespace { // Make everything here private
/* begin file src/generic/stage2/tape_writer.h */
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
really_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
really_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
really_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
really_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
really_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
really_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
really_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
really_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
really_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct number_writer
really_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
really_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
really_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
really_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
really_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
really_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
really_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
really_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
really_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
/* end file src/generic/stage2/tape_writer.h */
#ifdef SIMDJSON_USE_COMPUTED_GOTO
#define INIT_ADDRESSES() { &&array_begin, &&array_continue, &&error, &&finish, &&object_begin, &&object_continue }
#define GOTO(address) { goto *(address); }
#define CONTINUE(address) { goto *(address); }
#else // SIMDJSON_USE_COMPUTED_GOTO
#define INIT_ADDRESSES() { '[', 'a', 'e', 'f', '{', 'o' };
#define GOTO(address) \
{ \
switch(address) { \
case '[': goto array_begin; \
case 'a': goto array_continue; \
case 'e': goto error; \
case 'f': goto finish; \
case '{': goto object_begin; \
case 'o': goto object_continue; \
} \
}
// For the more constrained end_xxx() situation
#define CONTINUE(address) \
{ \
switch(address) { \
case 'a': goto array_continue; \
case 'o': goto object_continue; \
case 'f': goto finish; \
} \
}
#endif // SIMDJSON_USE_COMPUTED_GOTO
struct unified_machine_addresses {
ret_address_t array_begin;
ret_address_t array_continue;
ret_address_t error;
ret_address_t finish;
ret_address_t object_begin;
ret_address_t object_continue;
};
#undef FAIL_IF
#define FAIL_IF(EXPR) { if (EXPR) { return addresses.error; } }
struct structural_parser : structural_iterator {
/** Lets you append to the tape */
tape_writer tape;
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
/** Current depth (nested objects and arrays) */
uint32_t depth{0};
// For non-streaming, to pass an explicit 0 as next_structural, which enables optimizations
really_inline structural_parser(dom_parser_implementation &_parser, uint32_t start_structural_index)
: structural_iterator(_parser, start_structural_index),
tape{parser.doc->tape.get()},
current_string_buf_loc{parser.doc->string_buf.get()} {
}
WARN_UNUSED really_inline bool start_scope(ret_address_t continue_state) {
parser.containing_scope[depth].tape_index = next_tape_index();
parser.containing_scope[depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
parser.ret_address[depth] = continue_state;
depth++;
bool exceeded_max_depth = depth >= parser.max_depth();
if (exceeded_max_depth) { log_error("Exceeded max depth!"); }
return exceeded_max_depth;
}
WARN_UNUSED really_inline bool start_document(ret_address_t continue_state) {
log_start_value("document");
return start_scope(continue_state);
}
WARN_UNUSED really_inline bool start_object(ret_address_t continue_state) {
log_start_value("object");
return start_scope(continue_state);
}
WARN_UNUSED really_inline bool start_array(ret_address_t continue_state) {
log_start_value("array");
return start_scope(continue_state);
}
// this function is responsible for annotating the start of the scope
really_inline void end_scope(internal::tape_type start, internal::tape_type end) noexcept {
depth--;
// write our doc->tape location to the header scope
// The root scope gets written *at* the previous location.
tape.append(parser.containing_scope[depth].tape_index, end);
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t start_tape_index = parser.containing_scope[depth].tape_index;
const uint32_t count = parser.containing_scope[depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
// This is a load and an OR. It would be possible to just write once at doc->tape[d.tape_index]
tape_writer::write(parser.doc->tape[start_tape_index], next_tape_index() | (uint64_t(cntsat) << 32), start);
}
really_inline uint32_t next_tape_index() {
return uint32_t(tape.next_tape_loc - parser.doc->tape.get());
}
really_inline void end_object() {
log_end_value("object");
end_scope(internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
really_inline void end_array() {
log_end_value("array");
end_scope(internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
really_inline void end_document() {
log_end_value("document");
end_scope(internal::tape_type::ROOT, internal::tape_type::ROOT);
}
// increment_count increments the count of keys in an object or values in an array.
// Note that if you are at the level of the values or elements, the count
// must be increment in the preceding depth (depth-1) where the array or
// the object resides.
really_inline void increment_count() {
parser.containing_scope[depth - 1].count++; // we have a key value pair in the object at parser.depth - 1
}
really_inline uint8_t *on_start_string() noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
really_inline void on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
WARN_UNUSED really_inline bool parse_string(bool key = false) {
log_value(key ? "key" : "string");
uint8_t *dst = on_start_string();
dst = stringparsing::parse_string(current(), dst);
if (dst == nullptr) {
log_error("Invalid escape in string");
return true;
}
on_end_string(dst);
return false;
}
WARN_UNUSED really_inline bool parse_number(const uint8_t *src, bool found_minus) {
log_value("number");
bool succeeded = numberparsing::parse_number(src, found_minus, tape);
if (!succeeded) { log_error("Invalid number"); }
return !succeeded;
}
WARN_UNUSED really_inline bool parse_number(bool found_minus) {
return parse_number(current(), found_minus);
}
really_inline bool parse_number_with_space_terminated_copy(const bool is_negative) {
/**
* We need to make a copy to make sure that the string is space terminated.
* This is not about padding the input, which should already padded up
* to len + SIMDJSON_PADDING. However, we have no control at this stage
* on how the padding was done. What if the input string was padded with nulls?
* It is quite common for an input string to have an extra null character (C string).
* We do not want to allow 9\0 (where \0 is the null character) inside a JSON
* document, but the string "9\0" by itself is fine. So we make a copy and
* pad the input with spaces when we know that there is just one input element.
* This copy is relatively expensive, but it will almost never be called in
* practice unless you are in the strange scenario where you have many JSON
* documents made of single atoms.
*/
uint8_t *copy = static_cast<uint8_t *>(malloc(parser.len + SIMDJSON_PADDING));
if (copy == nullptr) {
return true;
}
memcpy(copy, buf, parser.len);
memset(copy + parser.len, ' ', SIMDJSON_PADDING);
size_t idx = *current_structural;
bool result = parse_number(&copy[idx], is_negative); // parse_number does not throw
free(copy);
return result;
}
WARN_UNUSED really_inline ret_address_t parse_value(const unified_machine_addresses &addresses, ret_address_t continue_state) {
switch (advance_char()) {
case '"':
FAIL_IF( parse_string() );
return continue_state;
case 't':
log_value("true");
FAIL_IF( !atomparsing::is_valid_true_atom(current()) );
tape.append(0, internal::tape_type::TRUE_VALUE);
return continue_state;
case 'f':
log_value("false");
FAIL_IF( !atomparsing::is_valid_false_atom(current()) );
tape.append(0, internal::tape_type::FALSE_VALUE);
return continue_state;
case 'n':
log_value("null");
FAIL_IF( !atomparsing::is_valid_null_atom(current()) );
tape.append(0, internal::tape_type::NULL_VALUE);
return continue_state;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
FAIL_IF( parse_number(false) );
return continue_state;
case '-':
FAIL_IF( parse_number(true) );
return continue_state;
case '{':
FAIL_IF( start_object(continue_state) );
return addresses.object_begin;
case '[':
FAIL_IF( start_array(continue_state) );
return addresses.array_begin;
default:
log_error("Non-value found when value was expected!");
return addresses.error;
}
}
WARN_UNUSED really_inline error_code finish() {
end_document();
parser.next_structural_index = uint32_t(current_structural + 1 - &parser.structural_indexes[0]);
if (depth != 0) {
log_error("Unclosed objects or arrays!");
return parser.error = TAPE_ERROR;
}
return SUCCESS;
}
WARN_UNUSED really_inline error_code error() {
/* We do not need the next line because this is done by parser.init_stage2(),
* pessimistically.
* parser.is_valid = false;
* At this point in the code, we have all the time in the world.
* Note that we know exactly where we are in the document so we could,
* without any overhead on the processing code, report a specific
* location.
* We could even trigger special code paths to assess what happened
* carefully,
* all without any added cost. */
if (depth >= parser.max_depth()) {
return parser.error = DEPTH_ERROR;
}
switch (current_char()) {
case '"':
return parser.error = STRING_ERROR;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '-':
return parser.error = NUMBER_ERROR;
case 't':
return parser.error = T_ATOM_ERROR;
case 'n':
return parser.error = N_ATOM_ERROR;
case 'f':
return parser.error = F_ATOM_ERROR;
default:
return parser.error = TAPE_ERROR;
}
}
really_inline void init() {
log_start();
parser.error = UNINITIALIZED;
}
WARN_UNUSED really_inline error_code start(ret_address_t finish_state) {
// If there are no structurals left, return EMPTY
if (at_end(parser.n_structural_indexes)) {
return parser.error = EMPTY;
}
init();
// Push the root scope (there is always at least one scope)
if (start_document(finish_state)) {
return parser.error = DEPTH_ERROR;
}
return SUCCESS;
}
really_inline void log_value(const char *type) {
logger::log_line(*this, "", type, "");
}
static really_inline void log_start() {
logger::log_start();
}
really_inline void log_start_value(const char *type) {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
really_inline void log_end_value(const char *type) {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
really_inline void log_error(const char *error) {
logger::log_line(*this, "", "ERROR", error);
}
}; // struct structural_parser
// Redefine FAIL_IF to use goto since it'll be used inside the function now
#undef FAIL_IF
#define FAIL_IF(EXPR) { if (EXPR) { goto error; } }
template<bool STREAMING>
WARN_UNUSED static error_code parse_structurals(dom_parser_implementation &dom_parser, dom::document &doc) noexcept {
dom_parser.doc = &doc;
static constexpr stage2::unified_machine_addresses addresses = INIT_ADDRESSES();
stage2::structural_parser parser(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
error_code result = parser.start(addresses.finish);
if (result) { return result; }
//
// Read first value
//
switch (parser.current_char()) {
case '{':
FAIL_IF( parser.start_object(addresses.finish) );
goto object_begin;
case '[':
FAIL_IF( parser.start_array(addresses.finish) );
// Make sure the outer array is closed before continuing; otherwise, there are ways we could get
// into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
if (parser.buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]] != ']') {
goto error;
}
}
goto array_begin;
case '"':
FAIL_IF( parser.parse_string() );
goto finish;
case 't':
parser.log_value("true");
FAIL_IF( !atomparsing::is_valid_true_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::TRUE_VALUE);
goto finish;
case 'f':
parser.log_value("false");
FAIL_IF( !atomparsing::is_valid_false_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::FALSE_VALUE);
goto finish;
case 'n':
parser.log_value("null");
FAIL_IF( !atomparsing::is_valid_null_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::NULL_VALUE);
goto finish;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
// Next line used to be an interesting functional programming exercise with
// a lambda that gets passed to another function via a closure. This would confuse the
// clangcl compiler under Visual Studio 2019 (recent release).
{ if(parser.parse_number_with_space_terminated_copy(false)) { goto error; }}
goto finish;
case '-':
// Next line used to be an interesting functional programming exercise with
// a lambda that gets passed to another function via a closure. This would confuse the
// clangcl compiler under Visual Studio 2019 (recent release).
{ if(parser.parse_number_with_space_terminated_copy(true)) { goto error; }}
goto finish;
default:
parser.log_error("Document starts with a non-value character");
goto error;
}
//
// Object parser states
//
object_begin:
switch (parser.advance_char()) {
case '"': {
parser.increment_count();
FAIL_IF( parser.parse_string(true) );
goto object_key_state;
}
case '}':
parser.end_object();
goto scope_end;
default:
parser.log_error("Object does not start with a key");
goto error;
}
object_key_state:
if (parser.advance_char() != ':' ) { parser.log_error("Missing colon after key in object"); goto error; }
GOTO( parser.parse_value(addresses, addresses.object_continue) );
object_continue:
switch (parser.advance_char()) {
case ',':
parser.increment_count();
if (parser.advance_char() != '"' ) { parser.log_error("Key string missing at beginning of field in object"); goto error; }
FAIL_IF( parser.parse_string(true) );
goto object_key_state;
case '}':
parser.end_object();
goto scope_end;
default:
parser.log_error("No comma between object fields");
goto error;
}
scope_end:
CONTINUE( parser.parser.ret_address[parser.depth] );
//
// Array parser states
//
array_begin:
if (parser.peek_next_char() == ']') {
parser.advance_char();
parser.end_array();
goto scope_end;
}
parser.increment_count();
main_array_switch:
/* we call update char on all paths in, so we can peek at parser.c on the
* on paths that can accept a close square brace (post-, and at start) */
GOTO( parser.parse_value(addresses, addresses.array_continue) );
array_continue:
switch (parser.advance_char()) {
case ',':
parser.increment_count();
goto main_array_switch;
case ']':
parser.end_array();
goto scope_end;
default:
parser.log_error("Missing comma between array values");
goto error;
}
finish:
return parser.finish();
error:
return parser.error();
}
} // namespace {}
} // namespace stage2
/************
* The JSON is parsed to a tape, see the accompanying tape.md file
* for documentation.
***********/
WARN_UNUSED error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
error_code result = stage2::parse_structurals<false>(*this, _doc);
if (result) { return result; }
// If we didn't make it to the end, it's an error
if ( next_structural_index != n_structural_indexes ) {
logger::log_string("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return error = TAPE_ERROR;
}
return SUCCESS;
}
/************
* The JSON is parsed to a tape, see the accompanying tape.md file
* for documentation.
***********/
WARN_UNUSED error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::parse_structurals<true>(*this, _doc);
}
/* end file src/generic/stage2/tape_writer.h */
WARN_UNUSED error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
error_code err = stage1(_buf, _len, false);
if (err) { return err; }
return stage2(_doc);
}
} // namespace haswell
} // namespace simdjson
UNTARGET_REGION
/* end file src/generic/stage2/tape_writer.h */
#endif
#if SIMDJSON_IMPLEMENTATION_WESTMERE
/* begin file src/westmere/implementation.cpp */
/* westmere/implementation.h already included: #include "westmere/implementation.h" */
/* begin file src/westmere/dom_parser_implementation.h */
#ifndef SIMDJSON_WESTMERE_DOM_PARSER_IMPLEMENTATION_H
#define SIMDJSON_WESTMERE_DOM_PARSER_IMPLEMENTATION_H
/* isadetection.h already included: #include "isadetection.h" */
namespace simdjson {
namespace westmere {
/* begin file src/generic/dom_parser_implementation.h */
// expectation: sizeof(scope_descriptor) = 64/8.
struct scope_descriptor {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct scope_descriptor
#ifdef SIMDJSON_USE_COMPUTED_GOTO
typedef void* ret_address_t;
#else
typedef char ret_address_t;
#endif
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<scope_descriptor[]> containing_scope{};
/** Return address of each open { or [ */
std::unique_ptr<ret_address_t[]> ret_address{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
/** Error code (TODO remove, this is not even used, we just set it so the g++ optimizer doesn't get confused) */
error_code error{UNINITIALIZED};
really_inline dom_parser_implementation();
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation & operator=(const dom_parser_implementation &) = delete;
WARN_UNUSED error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
WARN_UNUSED error_code stage1(const uint8_t *buf, size_t len, bool partial) noexcept final;
WARN_UNUSED error_code check_for_unclosed_array() noexcept;
WARN_UNUSED error_code stage2(dom::document &doc) noexcept final;
WARN_UNUSED error_code stage2_next(dom::document &doc) noexcept final;
WARN_UNUSED error_code set_capacity(size_t capacity) noexcept final;
WARN_UNUSED error_code set_max_depth(size_t max_depth) noexcept final;
};
/* begin file src/generic/stage1/allocate.h */
namespace stage1 {
namespace allocate {
//
// Allocates stage 1 internal state and outputs in the parser
//
really_inline error_code set_capacity(internal::dom_parser_implementation &parser, size_t capacity) {
size_t max_structures = ROUNDUP_N(capacity, 64) + 2 + 7;
parser.structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!parser.structural_indexes) { return MEMALLOC; }
parser.structural_indexes[0] = 0;
parser.n_structural_indexes = 0;
return SUCCESS;
}
} // namespace allocate
} // namespace stage1
/* end file src/generic/stage1/allocate.h */
/* begin file src/generic/stage2/allocate.h */
namespace stage2 {
namespace allocate {
//
// Allocates stage 2 internal state and outputs in the parser
//
really_inline error_code set_max_depth(dom_parser_implementation &parser, size_t max_depth) {
parser.containing_scope.reset(new (std::nothrow) scope_descriptor[max_depth]);
parser.ret_address.reset(new (std::nothrow) ret_address_t[max_depth]);
if (!parser.ret_address || !parser.containing_scope) {
return MEMALLOC;
}
return SUCCESS;
}
} // namespace allocate
} // namespace stage2
/* end file src/generic/stage2/allocate.h */
really_inline dom_parser_implementation::dom_parser_implementation() {}
// Leaving these here so they can be inlined if so desired
WARN_UNUSED error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
error_code err = stage1::allocate::set_capacity(*this, capacity);
if (err) { _capacity = 0; return err; }
_capacity = capacity;
return SUCCESS;
}
WARN_UNUSED error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
error_code err = stage2::allocate::set_max_depth(*this, max_depth);
if (err) { _max_depth = 0; return err; }
_max_depth = max_depth;
return SUCCESS;
}
/* end file src/generic/stage2/allocate.h */
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_DOM_PARSER_IMPLEMENTATION_H
/* end file src/generic/stage2/allocate.h */
TARGET_HASWELL
namespace simdjson {
namespace westmere {
WARN_UNUSED error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
dst->set_capacity(capacity);
dst->set_max_depth(max_depth);
return SUCCESS;
}
} // namespace westmere
} // namespace simdjson
UNTARGET_REGION
/* end file src/generic/stage2/allocate.h */
/* begin file src/westmere/dom_parser_implementation.cpp */
/* westmere/implementation.h already included: #include "westmere/implementation.h" */
/* westmere/dom_parser_implementation.h already included: #include "westmere/dom_parser_implementation.h" */
//
// Stage 1
//
/* begin file src/westmere/bitmask.h */
#ifndef SIMDJSON_WESTMERE_BITMASK_H
#define SIMDJSON_WESTMERE_BITMASK_H
/* begin file src/westmere/intrinsics.h */
#ifndef SIMDJSON_WESTMERE_INTRINSICS_H
#define SIMDJSON_WESTMERE_INTRINSICS_H
#ifdef SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#ifdef SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
*/
#include <smmintrin.h> // for _mm_alignr_epi8
#include <wmmintrin.h> // for _mm_clmulepi64_si128
#endif
#endif // SIMDJSON_WESTMERE_INTRINSICS_H
/* end file src/westmere/intrinsics.h */
TARGET_WESTMERE
namespace simdjson {
namespace westmere {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
really_inline uint64_t prefix_xor(const uint64_t bitmask) {
// There should be no such thing with a processing supporting avx2
// but not clmul.
__m128i all_ones = _mm_set1_epi8('\xFF');
__m128i result = _mm_clmulepi64_si128(_mm_set_epi64x(0ULL, bitmask), all_ones, 0);
return _mm_cvtsi128_si64(result);
}
} // namespace westmere
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_WESTMERE_BITMASK_H
/* end file src/westmere/intrinsics.h */
/* begin file src/westmere/simd.h */
#ifndef SIMDJSON_WESTMERE_SIMD_H
#define SIMDJSON_WESTMERE_SIMD_H
/* simdprune_tables.h already included: #include "simdprune_tables.h" */
/* begin file src/westmere/bitmanipulation.h */
#ifndef SIMDJSON_WESTMERE_BITMANIPULATION_H
#define SIMDJSON_WESTMERE_BITMANIPULATION_H
/* westmere/intrinsics.h already included: #include "westmere/intrinsics.h" */
TARGET_WESTMERE
namespace simdjson {
namespace westmere {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
NO_SANITIZE_UNDEFINED
really_inline int trailing_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
really_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
really_inline int leading_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// SIMDJSON_REGULAR_VISUAL_STUDIO
}
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
really_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
really_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
really_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
(unsigned long long *)result);
#endif
}
#if defined(SIMDJSON_REGULAR_VISUAL_STUDIO) || defined(SIMDJSON_IS_32BITS)
#pragma intrinsic(_umul128)
#endif
really_inline bool mul_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
uint64_t high;
*result = _umul128(value1, value2, &high);
return high;
#else
return __builtin_umulll_overflow(value1, value2,
(unsigned long long *)result);
#endif
}
} // namespace westmere
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_WESTMERE_BITMANIPULATION_H
/* end file src/westmere/bitmanipulation.h */
/* westmere/intrinsics.h already included: #include "westmere/intrinsics.h" */
TARGET_WESTMERE
namespace simdjson {
namespace westmere {
namespace simd {
template<typename Child>
struct base {
__m128i value;
// Zero constructor
really_inline base() : value{__m128i()} {}
// Conversion from SIMD register
really_inline base(const __m128i _value) : value(_value) {}
// Conversion to SIMD register
really_inline operator const __m128i&() const { return this->value; }
really_inline operator __m128i&() { return this->value; }
// Bit operations
really_inline Child operator|(const Child other) const { return _mm_or_si128(*this, other); }
really_inline Child operator&(const Child other) const { return _mm_and_si128(*this, other); }
really_inline Child operator^(const Child other) const { return _mm_xor_si128(*this, other); }
really_inline Child bit_andnot(const Child other) const { return _mm_andnot_si128(other, *this); }
really_inline Child& operator|=(const Child other) { auto this_cast = (Child*)this; *this_cast = *this_cast | other; return *this_cast; }
really_inline Child& operator&=(const Child other) { auto this_cast = (Child*)this; *this_cast = *this_cast & other; return *this_cast; }
really_inline Child& operator^=(const Child other) { auto this_cast = (Child*)this; *this_cast = *this_cast ^ other; return *this_cast; }
};
// Forward-declared so they can be used by splat and friends.
template<typename T>
struct simd8;
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
really_inline base8() : base<simd8<T>>() {}
really_inline base8(const __m128i _value) : base<simd8<T>>(_value) {}
really_inline Mask operator==(const simd8<T> other) const { return _mm_cmpeq_epi8(*this, other); }
static const int SIZE = sizeof(base<simd8<T>>::value);
template<int N=1>
really_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return _mm_alignr_epi8(*this, prev_chunk, 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static really_inline simd8<bool> splat(bool _value) { return _mm_set1_epi8(uint8_t(-(!!_value))); }
really_inline simd8<bool>() : base8() {}
really_inline simd8<bool>(const __m128i _value) : base8<bool>(_value) {}
// Splat constructor
really_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
really_inline int to_bitmask() const { return _mm_movemask_epi8(*this); }
really_inline bool any() const { return !_mm_testz_si128(*this, *this); }
really_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static really_inline simd8<T> splat(T _value) { return _mm_set1_epi8(_value); }
static really_inline simd8<T> zero() { return _mm_setzero_si128(); }
static really_inline simd8<T> load(const T values[16]) {
return _mm_loadu_si128(reinterpret_cast<const __m128i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static really_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
really_inline base8_numeric() : base8<T>() {}
really_inline base8_numeric(const __m128i _value) : base8<T>(_value) {}
// Store to array
really_inline void store(T dst[16]) const { return _mm_storeu_si128(reinterpret_cast<__m128i *>(dst), *this); }
// Override to distinguish from bool version
really_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Addition/subtraction are the same for signed and unsigned
really_inline simd8<T> operator+(const simd8<T> other) const { return _mm_add_epi8(*this, other); }
really_inline simd8<T> operator-(const simd8<T> other) const { return _mm_sub_epi8(*this, other); }
really_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *(simd8<T>*)this; }
really_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *(simd8<T>*)this; }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
really_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 16 - count_ones(mask) bytes of the result are significant but 16 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
really_inline void compress(uint16_t mask, L * output) const {
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
__m128i shufmask = _mm_set_epi64x(thintable_epi8[mask2], thintable_epi8[mask1]);
// we increment by 0x08 the second half of the mask
shufmask =
_mm_add_epi8(shufmask, _mm_set_epi32(0x08080808, 0x08080808, 0, 0));
// this is the version "nearly pruned"
__m128i pruned = _mm_shuffle_epi8(*this, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
__m128i compactmask =
_mm_loadu_si128((const __m128i *)(pshufb_combine_table + pop1 * 8));
__m128i answer = _mm_shuffle_epi8(pruned, compactmask);
_mm_storeu_si128(( __m128i *)(output), answer);
}
template<typename L>
really_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
really_inline simd8() : base8_numeric<int8_t>() {}
really_inline simd8(const __m128i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
really_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
really_inline simd8(const int8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
really_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
really_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
really_inline simd8<int8_t> max(const simd8<int8_t> other) const { return _mm_max_epi8(*this, other); }
really_inline simd8<int8_t> min(const simd8<int8_t> other) const { return _mm_min_epi8(*this, other); }
really_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(*this, other); }
really_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(other, *this); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
really_inline simd8() : base8_numeric<uint8_t>() {}
really_inline simd8(const __m128i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
really_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
really_inline simd8(const uint8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
really_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
really_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
really_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm_adds_epu8(*this, other); }
really_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm_subs_epu8(*this, other); }
// Order-specific operations
really_inline simd8<uint8_t> max(const simd8<uint8_t> other) const { return _mm_max_epu8(*this, other); }
really_inline simd8<uint8_t> min(const simd8<uint8_t> other) const { return _mm_min_epu8(*this, other); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
really_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
really_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
really_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return other.max(*this) == other; }
really_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return other.min(*this) == other; }
really_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
really_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
// Bit-specific operations
really_inline simd8<bool> bits_not_set() const { return *this == uint8_t(0); }
really_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
really_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
really_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
really_inline bool bits_not_set_anywhere() const { return _mm_testz_si128(*this, *this); }
really_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
really_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return _mm_testz_si128(*this, bits); }
really_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
really_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
really_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
really_inline int get_bit() const { return _mm_movemask_epi8(_mm_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static const int NUM_CHUNKS = 64 / sizeof(simd8<T>);
const simd8<T> chunks[NUM_CHUNKS];
really_inline simd8x64() : chunks{simd8<T>(), simd8<T>(), simd8<T>(), simd8<T>()} {}
really_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1, const simd8<T> chunk2, const simd8<T> chunk3) : chunks{chunk0, chunk1, chunk2, chunk3} {}
really_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+16), simd8<T>::load(ptr+32), simd8<T>::load(ptr+48)} {}
really_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
this->chunks[2].store(ptr+sizeof(simd8<T>)*2);
this->chunks[3].store(ptr+sizeof(simd8<T>)*3);
}
really_inline void compress(uint64_t mask, T * output) const {
this->chunks[0].compress(uint16_t(mask), output);
this->chunks[1].compress(uint16_t(mask >> 16), output + 16 - count_ones(mask & 0xFFFF));
this->chunks[2].compress(uint16_t(mask >> 32), output + 32 - count_ones(mask & 0xFFFFFFFF));
this->chunks[3].compress(uint16_t(mask >> 48), output + 48 - count_ones(mask & 0xFFFFFFFFFFFF));
}
template <typename F>
static really_inline void each_index(F const& each) {
each(0);
each(1);
each(2);
each(3);
}
really_inline uint64_t to_bitmask() const {
uint64_t r0 = uint32_t(this->chunks[0].to_bitmask());
uint64_t r1 = this->chunks[1].to_bitmask();
uint64_t r2 = this->chunks[2].to_bitmask();
uint64_t r3 = this->chunks[3].to_bitmask();
return r0 | (r1 << 16) | (r2 << 32) | (r3 << 48);
}
really_inline simd8x64<T> bit_or(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<T>(
this->chunks[0] | mask,
this->chunks[1] | mask,
this->chunks[2] | mask,
this->chunks[3] | mask
);
}
really_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask,
this->chunks[2] == mask,
this->chunks[3] == mask
).to_bitmask();
}
really_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask,
this->chunks[2] <= mask,
this->chunks[3] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // namespace westmere
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_WESTMERE_SIMD_INPUT_H
/* end file src/westmere/bitmanipulation.h */
/* westmere/bitmanipulation.h already included: #include "westmere/bitmanipulation.h" */
/* westmere/implementation.h already included: #include "westmere/implementation.h" */
TARGET_WESTMERE
namespace simdjson {
namespace westmere {
using namespace simd;
struct json_character_block {
static really_inline json_character_block classify(const simd::simd8x64<uint8_t> in);
really_inline uint64_t whitespace() const { return _whitespace; }
really_inline uint64_t op() const { return _op; }
really_inline uint64_t scalar() { return ~(op() | whitespace()); }
uint64_t _whitespace;
uint64_t _op;
};
really_inline json_character_block json_character_block::classify(const simd::simd8x64<uint8_t> in) {
// These lookups rely on the fact that anything < 127 will match the lower 4 bits, which is why
// we can't use the generic lookup_16.
auto whitespace_table = simd8<uint8_t>::repeat_16(' ', 100, 100, 100, 17, 100, 113, 2, 100, '\t', '\n', 112, 100, '\r', 100, 100);
auto op_table = simd8<uint8_t>::repeat_16(',', '}', 0, 0, 0xc0u, 0, 0, 0, 0, 0, 0, 0, 0, 0, ':', '{');
// We compute whitespace and op separately. If the code later only use one or the
// other, given the fact that all functions are aggressively inlined, we can
// hope that useless computations will be omitted. This is namely case when
// minifying (we only need whitespace).
uint64_t whitespace = simd8x64<bool>(
in.chunks[0] == simd8<uint8_t>(_mm_shuffle_epi8(whitespace_table, in.chunks[0])),
in.chunks[1] == simd8<uint8_t>(_mm_shuffle_epi8(whitespace_table, in.chunks[1])),
in.chunks[2] == simd8<uint8_t>(_mm_shuffle_epi8(whitespace_table, in.chunks[2])),
in.chunks[3] == simd8<uint8_t>(_mm_shuffle_epi8(whitespace_table, in.chunks[3]))
).to_bitmask();
// | 32 handles the fact that { } and [ ] are exactly 32 bytes apart
uint64_t op = simd8x64<bool>(
(in.chunks[0] | 32) == simd8<uint8_t>(_mm_shuffle_epi8(op_table, in.chunks[0]-',')),
(in.chunks[1] | 32) == simd8<uint8_t>(_mm_shuffle_epi8(op_table, in.chunks[1]-',')),
(in.chunks[2] | 32) == simd8<uint8_t>(_mm_shuffle_epi8(op_table, in.chunks[2]-',')),
(in.chunks[3] | 32) == simd8<uint8_t>(_mm_shuffle_epi8(op_table, in.chunks[3]-','))
).to_bitmask();
return { whitespace, op };
}
really_inline bool is_ascii(simd8x64<uint8_t> input) {
simd8<uint8_t> bits = (input.chunks[0] | input.chunks[1]) | (input.chunks[2] | input.chunks[3]);
return !bits.any_bits_set_anywhere(0b10000000u);
}
really_inline simd8<bool> must_be_continuation(simd8<uint8_t> prev1, simd8<uint8_t> prev2, simd8<uint8_t> prev3) {
simd8<uint8_t> is_second_byte = prev1.saturating_sub(0b11000000u-1); // Only 11______ will be > 0
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0b11100000u-1); // Only 111_____ will be > 0
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0b11110000u-1); // Only 1111____ will be > 0
// Caller requires a bool (all 1's). All values resulting from the subtraction will be <= 64, so signed comparison is fine.
return simd8<int8_t>(is_second_byte | is_third_byte | is_fourth_byte) > int8_t(0);
}
really_inline simd8<bool> must_be_2_3_continuation(simd8<uint8_t> prev2, simd8<uint8_t> prev3) {
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0b11100000u-1); // Only 111_____ will be > 0
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0b11110000u-1); // Only 1111____ will be > 0
// Caller requires a bool (all 1's). All values resulting from the subtraction will be <= 64, so signed comparison is fine.
return simd8<int8_t>(is_third_byte | is_fourth_byte) > int8_t(0);
}
/* begin file src/generic/stage1/buf_block_reader.h */
// Walks through a buffer in block-sized increments, loading the last part with spaces
template<size_t STEP_SIZE>
struct buf_block_reader {
public:
really_inline buf_block_reader(const uint8_t *_buf, size_t _len);
really_inline size_t block_index();
really_inline bool has_full_block() const;
really_inline const uint8_t *full_block() const;
/**
* Get the last block, padded with spaces.
*
* There will always be a last block, with at least 1 byte, unless len == 0 (in which case this
* function fills the buffer with spaces and returns 0. In particular, if len == STEP_SIZE there
* will be 0 full_blocks and 1 remainder block with STEP_SIZE bytes and no spaces for padding.
*
* @return the number of effective characters in the last block.
*/
really_inline size_t get_remainder(uint8_t *dst) const;
really_inline void advance();
private:
const uint8_t *buf;
const size_t len;
const size_t lenminusstep;
size_t idx;
};
// Routines to print masks and text for debugging bitmask operations
UNUSED static char * format_input_text_64(const uint8_t *text) {
static char *buf = (char*)malloc(sizeof(simd8x64<uint8_t>) + 1);
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
buf[i] = int8_t(text[i]) < ' ' ? '_' : int8_t(text[i]);
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
// Routines to print masks and text for debugging bitmask operations
UNUSED static char * format_input_text(const simd8x64<uint8_t> in) {
static char *buf = (char*)malloc(sizeof(simd8x64<uint8_t>) + 1);
in.store((uint8_t*)buf);
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] < ' ') { buf[i] = '_'; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
UNUSED static char * format_mask(uint64_t mask) {
static char *buf = (char*)malloc(64 + 1);
for (size_t i=0; i<64; i++) {
buf[i] = (mask & (size_t(1) << i)) ? 'X' : ' ';
}
buf[64] = '\0';
return buf;
}
template<size_t STEP_SIZE>
really_inline buf_block_reader<STEP_SIZE>::buf_block_reader(const uint8_t *_buf, size_t _len) : buf{_buf}, len{_len}, lenminusstep{len < STEP_SIZE ? 0 : len - STEP_SIZE}, idx{0} {}
template<size_t STEP_SIZE>
really_inline size_t buf_block_reader<STEP_SIZE>::block_index() { return idx; }
template<size_t STEP_SIZE>
really_inline bool buf_block_reader<STEP_SIZE>::has_full_block() const {
return idx < lenminusstep;
}
template<size_t STEP_SIZE>
really_inline const uint8_t *buf_block_reader<STEP_SIZE>::full_block() const {
return &buf[idx];
}
template<size_t STEP_SIZE>
really_inline size_t buf_block_reader<STEP_SIZE>::get_remainder(uint8_t *dst) const {
memset(dst, 0x20, STEP_SIZE); // memset STEP_SIZE because it's more efficient to write out 8 or 16 bytes at once.
memcpy(dst, buf + idx, len - idx);
return len - idx;
}
template<size_t STEP_SIZE>
really_inline void buf_block_reader<STEP_SIZE>::advance() {
idx += STEP_SIZE;
}
/* end file src/generic/stage1/buf_block_reader.h */
/* begin file src/generic/stage1/json_string_scanner.h */
namespace stage1 {
struct json_string_block {
// Escaped characters (characters following an escape() character)
really_inline uint64_t escaped() const { return _escaped; }
// Escape characters (backslashes that are not escaped--i.e. in \\, includes only the first \)
really_inline uint64_t escape() const { return _backslash & ~_escaped; }
// Real (non-backslashed) quotes
really_inline uint64_t quote() const { return _quote; }
// Start quotes of strings
really_inline uint64_t string_end() const { return _quote & _in_string; }
// End quotes of strings
really_inline uint64_t string_start() const { return _quote & ~_in_string; }
// Only characters inside the string (not including the quotes)
really_inline uint64_t string_content() const { return _in_string & ~_quote; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
really_inline uint64_t non_quote_inside_string(uint64_t mask) const { return mask & _in_string; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
really_inline uint64_t non_quote_outside_string(uint64_t mask) const { return mask & ~_in_string; }
// Tail of string (everything except the start quote)
really_inline uint64_t string_tail() const { return _in_string ^ _quote; }
// backslash characters
uint64_t _backslash;
// escaped characters (backslashed--does not include the hex characters after \u)
uint64_t _escaped;
// real quotes (non-backslashed ones)
uint64_t _quote;
// string characters (includes start quote but not end quote)
uint64_t _in_string;
};
// Scans blocks for string characters, storing the state necessary to do so
class json_string_scanner {
public:
really_inline json_string_block next(const simd::simd8x64<uint8_t> in);
really_inline error_code finish(bool streaming);
private:
// Intended to be defined by the implementation
really_inline uint64_t find_escaped(uint64_t escape);
really_inline uint64_t find_escaped_branchless(uint64_t escape);
// Whether the last iteration was still inside a string (all 1's = true, all 0's = false).
uint64_t prev_in_string = 0ULL;
// Whether the first character of the next iteration is escaped.
uint64_t prev_escaped = 0ULL;
};
//
// Finds escaped characters (characters following \).
//
// Handles runs of backslashes like \\\" and \\\\" correctly (yielding 0101 and 01010, respectively).
//
// Does this by:
// - Shift the escape mask to get potentially escaped characters (characters after backslashes).
// - Mask escaped sequences that start on *even* bits with 1010101010 (odd bits are escaped, even bits are not)
// - Mask escaped sequences that start on *odd* bits with 0101010101 (even bits are escaped, odd bits are not)
//
// To distinguish between escaped sequences starting on even/odd bits, it finds the start of all
// escape sequences, filters out the ones that start on even bits, and adds that to the mask of
// escape sequences. This causes the addition to clear out the sequences starting on odd bits (since
// the start bit causes a carry), and leaves even-bit sequences alone.
//
// Example:
//
// text | \\\ | \\\"\\\" \\\" \\"\\" |
// escape | xxx | xx xxx xxx xx xx | Removed overflow backslash; will | it into follows_escape
// odd_starts | x | x x x | escape & ~even_bits & ~follows_escape
// even_seq | c| cxxx c xx c | c = carry bit -- will be masked out later
// invert_mask | | cxxx c xx c| even_seq << 1
// follows_escape | xx | x xx xxx xxx xx xx | Includes overflow bit
// escaped | x | x x x x x x x x |
// desired | x | x x x x x x x x |
// text | \\\ | \\\"\\\" \\\" \\"\\" |
//
really_inline uint64_t json_string_scanner::find_escaped_branchless(uint64_t backslash) {
// If there was overflow, pretend the first character isn't a backslash
backslash &= ~prev_escaped;
uint64_t follows_escape = backslash << 1 | prev_escaped;
// Get sequences starting on even bits by clearing out the odd series using +
const uint64_t even_bits = 0x5555555555555555ULL;
uint64_t odd_sequence_starts = backslash & ~even_bits & ~follows_escape;
uint64_t sequences_starting_on_even_bits;
prev_escaped = add_overflow(odd_sequence_starts, backslash, &sequences_starting_on_even_bits);
uint64_t invert_mask = sequences_starting_on_even_bits << 1; // The mask we want to return is the *escaped* bits, not escapes.
// Mask every other backslashed character as an escaped character
// Flip the mask for sequences that start on even bits, to correct them
return (even_bits ^ invert_mask) & follows_escape;
}
//
// Return a mask of all string characters plus end quotes.
//
// prev_escaped is overflow saying whether the next character is escaped.
// prev_in_string is overflow saying whether we're still in a string.
//
// Backslash sequences outside of quotes will be detected in stage 2.
//
really_inline json_string_block json_string_scanner::next(const simd::simd8x64<uint8_t> in) {
const uint64_t backslash = in.eq('\\');
const uint64_t escaped = find_escaped(backslash);
const uint64_t quote = in.eq('"') & ~escaped;
//
// prefix_xor flips on bits inside the string (and flips off the end quote).
//
// Then we xor with prev_in_string: if we were in a string already, its effect is flipped
// (characters inside strings are outside, and characters outside strings are inside).
//
const uint64_t in_string = prefix_xor(quote) ^ prev_in_string;
//
// Check if we're still in a string at the end of the box so the next block will know
//
// right shift of a signed value expected to be well-defined and standard
// compliant as of C++20, John Regher from Utah U. says this is fine code
//
prev_in_string = uint64_t(static_cast<int64_t>(in_string) >> 63);
// Use ^ to turn the beginning quote off, and the end quote on.
return {
backslash,
escaped,
quote,
in_string
};
}
really_inline error_code json_string_scanner::finish(bool streaming) {
if (prev_in_string and (not streaming)) {
return UNCLOSED_STRING;
}
return SUCCESS;
}
} // namespace stage1
/* end file src/generic/stage1/json_string_scanner.h */
/* begin file src/generic/stage1/json_scanner.h */
namespace stage1 {
/**
* A block of scanned json, with information on operators and scalars.
*/
struct json_block {
public:
/** The start of structurals */
really_inline uint64_t structural_start() { return potential_structural_start() & ~_string.string_tail(); }
/** All JSON whitespace (i.e. not in a string) */
really_inline uint64_t whitespace() { return non_quote_outside_string(_characters.whitespace()); }
// Helpers
/** Whether the given characters are inside a string (only works on non-quotes) */
really_inline uint64_t non_quote_inside_string(uint64_t mask) { return _string.non_quote_inside_string(mask); }
/** Whether the given characters are outside a string (only works on non-quotes) */
really_inline uint64_t non_quote_outside_string(uint64_t mask) { return _string.non_quote_outside_string(mask); }
// string and escape characters
json_string_block _string;
// whitespace, operators, scalars
json_character_block _characters;
// whether the previous character was a scalar
uint64_t _follows_potential_scalar;
private:
// Potential structurals (i.e. disregarding strings)
/** operators plus scalar starts like 123, true and "abc" */
really_inline uint64_t potential_structural_start() { return _characters.op() | potential_scalar_start(); }
/** the start of non-operator runs, like 123, true and "abc" */
really_inline uint64_t potential_scalar_start() { return _characters.scalar() & ~follows_potential_scalar(); }
/** whether the given character is immediately after a non-operator like 123, true or " */
really_inline uint64_t follows_potential_scalar() { return _follows_potential_scalar; }
};
/**
* Scans JSON for important bits: operators, strings, and scalars.
*
* The scanner starts by calculating two distinct things:
* - string characters (taking \" into account)
* - operators ([]{},:) and scalars (runs of non-operators like 123, true and "abc")
*
* To minimize data dependency (a key component of the scanner's speed), it finds these in parallel:
* in particular, the operator/scalar bit will find plenty of things that are actually part of
* strings. When we're done, json_block will fuse the two together by masking out tokens that are
* part of a string.
*/
class json_scanner {
public:
json_scanner() {}
really_inline json_block next(const simd::simd8x64<uint8_t> in);
really_inline error_code finish(bool streaming);
private:
// Whether the last character of the previous iteration is part of a scalar token
// (anything except whitespace or an operator).
uint64_t prev_scalar = 0ULL;
json_string_scanner string_scanner{};
};
//
// Check if the current character immediately follows a matching character.
//
// For example, this checks for quotes with backslashes in front of them:
//
// const uint64_t backslashed_quote = in.eq('"') & immediately_follows(in.eq('\'), prev_backslash);
//
really_inline uint64_t follows(const uint64_t match, uint64_t &overflow) {
const uint64_t result = match << 1 | overflow;
overflow = match >> 63;
return result;
}
//
// Check if the current character follows a matching character, with possible "filler" between.
// For example, this checks for empty curly braces, e.g.
//
// in.eq('}') & follows(in.eq('['), in.eq(' '), prev_empty_array) // { <whitespace>* }
//
really_inline uint64_t follows(const uint64_t match, const uint64_t filler, uint64_t &overflow) {
uint64_t follows_match = follows(match, overflow);
uint64_t result;
overflow |= uint64_t(add_overflow(follows_match, filler, &result));
return result;
}
really_inline json_block json_scanner::next(const simd::simd8x64<uint8_t> in) {
json_string_block strings = string_scanner.next(in);
json_character_block characters = json_character_block::classify(in);
uint64_t follows_scalar = follows(characters.scalar(), prev_scalar);
return {
strings,
characters,
follows_scalar
};
}
really_inline error_code json_scanner::finish(bool streaming) {
return string_scanner.finish(streaming);
}
} // namespace stage1
/* end file src/generic/stage1/json_scanner.h */
namespace stage1 {
really_inline uint64_t json_string_scanner::find_escaped(uint64_t backslash) {
if (!backslash) { uint64_t escaped = prev_escaped; prev_escaped = 0; return escaped; }
return find_escaped_branchless(backslash);
}
}
/* begin file src/generic/stage1/json_minifier.h */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace stage1 {
class json_minifier {
public:
template<size_t STEP_SIZE>
static error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept;
private:
really_inline json_minifier(uint8_t *_dst)
: dst{_dst}
{}
template<size_t STEP_SIZE>
really_inline void step(const uint8_t *block_buf, buf_block_reader<STEP_SIZE> &reader) noexcept;
really_inline void next(simd::simd8x64<uint8_t> in, json_block block);
really_inline error_code finish(uint8_t *dst_start, size_t &dst_len);
json_scanner scanner{};
uint8_t *dst;
};
really_inline void json_minifier::next(simd::simd8x64<uint8_t> in, json_block block) {
uint64_t mask = block.whitespace();
in.compress(mask, dst);
dst += 64 - count_ones(mask);
}
really_inline error_code json_minifier::finish(uint8_t *dst_start, size_t &dst_len) {
*dst = '\0';
error_code error = scanner.finish(false);
if (error) { dst_len = 0; return error; }
dst_len = dst - dst_start;
return SUCCESS;
}
template<>
really_inline void json_minifier::step<128>(const uint8_t *block_buf, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
simd::simd8x64<uint8_t> in_2(block_buf+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1);
this->next(in_2, block_2);
reader.advance();
}
template<>
really_inline void json_minifier::step<64>(const uint8_t *block_buf, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
json_block block_1 = scanner.next(in_1);
this->next(block_buf, block_1);
reader.advance();
}
template<size_t STEP_SIZE>
error_code json_minifier::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept {
buf_block_reader<STEP_SIZE> reader(buf, len);
json_minifier minifier(dst);
// Index the first n-1 blocks
while (reader.has_full_block()) {
minifier.step<STEP_SIZE>(reader.full_block(), reader);
}
// Index the last (remainder) block, padded with spaces
uint8_t block[STEP_SIZE];
if (likely(reader.get_remainder(block)) > 0) {
minifier.step<STEP_SIZE>(block, reader);
}
return minifier.finish(dst, dst_len);
}
} // namespace stage1
/* end file src/generic/stage1/json_minifier.h */
WARN_UNUSED error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
return westmere::stage1::json_minifier::minify<64>(buf, len, dst, dst_len);
}
/* begin file src/generic/stage1/find_next_document_index.h */
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ';' ','
* and when the second element is NOT one of these characters: '}' '}' ';' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
really_inline static uint32_t find_next_document_index(dom_parser_implementation &parser) {
// TODO don't count separately, just figure out depth
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
return 0;
}
// Skip the last character if it is partial
really_inline static size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0b11100000) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0b11000000) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0b11100000) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0b11110000) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
/* end file src/generic/stage1/find_next_document_index.h */
/* begin file src/generic/stage1/utf8_lookup3_algorithm.h */
//
// Detect Unicode errors.
//
// UTF-8 is designed to allow multiple bytes and be compatible with ASCII. It's a fairly basic
// encoding that uses the first few bits on each byte to denote a "byte type", and all other bits
// are straight up concatenated into the final value. The first byte of a multibyte character is a
// "leading byte" and starts with N 1's, where N is the total number of bytes (110_____ = 2 byte
// lead). The remaining bytes of a multibyte character all start with 10. 1-byte characters just
// start with 0, because that's what ASCII looks like. Here's what each size looks like:
//
// - ASCII (7 bits): 0_______
// - 2 byte character (11 bits): 110_____ 10______
// - 3 byte character (17 bits): 1110____ 10______ 10______
// - 4 byte character (23 bits): 11110___ 10______ 10______ 10______
// - 5+ byte character (illegal): 11111___ <illegal>
//
// There are 5 classes of error that can happen in Unicode:
//
// - TOO_SHORT: when you have a multibyte character with too few bytes (i.e. missing continuation).
// We detect this by looking for new characters (lead bytes) inside the range of a multibyte
// character.
//
// e.g. 11000000 01100001 (2-byte character where second byte is ASCII)
//
// - TOO_LONG: when there are more bytes in your character than you need (i.e. extra continuation).
// We detect this by requiring that the next byte after your multibyte character be a new
// character--so a continuation after your character is wrong.
//
// e.g. 11011111 10111111 10111111 (2-byte character followed by *another* continuation byte)
//
// - TOO_LARGE: Unicode only goes up to U+10FFFF. These characters are too large.
//
// e.g. 11110111 10111111 10111111 10111111 (bigger than 10FFFF).
//
// - OVERLONG: multibyte characters with a bunch of leading zeroes, where you could have
// used fewer bytes to make the same character. Like encoding an ASCII character in 4 bytes is
// technically possible, but UTF-8 disallows it so that there is only one way to write an "a".
//
// e.g. 11000001 10100001 (2-byte encoding of "a", which only requires 1 byte: 01100001)
//
// - SURROGATE: Unicode U+D800-U+DFFF is a *surrogate* character, reserved for use in UCS-2 and
// WTF-8 encodings for characters with > 2 bytes. These are illegal in pure UTF-8.
//
// e.g. 11101101 10100000 10000000 (U+D800)
//
// - INVALID_5_BYTE: 5-byte, 6-byte, 7-byte and 8-byte characters are unsupported; Unicode does not
// support values with more than 23 bits (which a 4-byte character supports).
//
// e.g. 11111000 10100000 10000000 10000000 10000000 (U+800000)
//
// Legal utf-8 byte sequences per http://www.unicode.org/versions/Unicode6.0.0/ch03.pdf - page 94:
//
// Code Points 1st 2s 3s 4s
// U+0000..U+007F 00..7F
// U+0080..U+07FF C2..DF 80..BF
// U+0800..U+0FFF E0 A0..BF 80..BF
// U+1000..U+CFFF E1..EC 80..BF 80..BF
// U+D000..U+D7FF ED 80..9F 80..BF
// U+E000..U+FFFF EE..EF 80..BF 80..BF
// U+10000..U+3FFFF F0 90..BF 80..BF 80..BF
// U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
// U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
//
using namespace simd;
namespace utf8_validation {
// For a detailed description of the lookup2 algorithm, see the file HACKING.md under "UTF-8 validation (lookup2)".
//
// Find special case UTF-8 errors where the character is technically readable (has the right length)
// but the *value* is disallowed.
//
// This includes overlong encodings, surrogates and values too large for Unicode.
//
// It turns out the bad character ranges can all be detected by looking at the first 12 bits of the
// UTF-8 encoded character (i.e. all of byte 1, and the high 4 bits of byte 2). This algorithm does a
// 3 4-bit table lookups, identifying which errors that 4 bits could match, and then &'s them together.
// If all 3 lookups detect the same error, it's an error.
//
really_inline simd8<uint8_t> check_special_cases(const simd8<uint8_t> input, const simd8<uint8_t> prev1) {
//
// These are the errors we're going to match for bytes 1-2, by looking at the first three
// nibbles of the character: <high bits of byte 1>> & <low bits of byte 1> & <high bits of byte 2>
//
static const int OVERLONG_2 = 0x01; // 1100000_ 10______ (technically we match 10______ but we could match ________, they both yield errors either way)
static const int OVERLONG_3 = 0x02; // 11100000 100_____ ________
static const int OVERLONG_4 = 0x04; // 11110000 1000____ ________ ________
static const int SURROGATE = 0x08; // 11101101 [101_]____
static const int TOO_LARGE = 0x10; // 11110100 (1001|101_)____
static const int TOO_LARGE_2 = 0x20; // 1111(1___|011_|0101) 10______
// New with lookup3. We want to catch the case where an non-continuation
// follows a leading byte
static const int TOO_SHORT_2_3_4 = 0x40; // (110_|1110|1111) ____ (0___|110_|1111) ____
// We also want to catch a continuation that is preceded by an ASCII byte
static const int LONELY_CONTINUATION = 0x80; // 0___ ____ 01__ ____
// After processing the rest of byte 1 (the low bits), we're still not done--we have to check
// byte 2 to be sure which things are errors and which aren't.
// Since high_bits is byte 5, byte 2 is high_bits.prev<3>
static const int CARRY = OVERLONG_2 | TOO_LARGE_2;
const simd8<uint8_t> byte_2_high = input.shr<4>().lookup_16<uint8_t>(
// ASCII: ________ [0___]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
// ASCII: ________ [0___]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4,
// Continuations: ________ [10__]____
CARRY | OVERLONG_3 | OVERLONG_4 | LONELY_CONTINUATION, // ________ [1000]____
CARRY | OVERLONG_3 | TOO_LARGE | LONELY_CONTINUATION, // ________ [1001]____
CARRY | TOO_LARGE | SURROGATE | LONELY_CONTINUATION, // ________ [1010]____
CARRY | TOO_LARGE | SURROGATE | LONELY_CONTINUATION, // ________ [1011]____
// Multibyte Leads: ________ [11__]____
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4, // 110_
CARRY | TOO_SHORT_2_3_4, CARRY | TOO_SHORT_2_3_4
);
const simd8<uint8_t> byte_1_high = prev1.shr<4>().lookup_16<uint8_t>(
// [0___]____ (ASCII)
LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION,
LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION, LONELY_CONTINUATION,
// [10__]____ (continuation)
0, 0, 0, 0,
// [11__]____ (2+-byte leads)
OVERLONG_2 | TOO_SHORT_2_3_4, TOO_SHORT_2_3_4, // [110_]____ (2-byte lead)
OVERLONG_3 | SURROGATE | TOO_SHORT_2_3_4, // [1110]____ (3-byte lead)
OVERLONG_4 | TOO_LARGE | TOO_LARGE_2 | TOO_SHORT_2_3_4 // [1111]____ (4+-byte lead)
);
const simd8<uint8_t> byte_1_low = (prev1 & 0x0F).lookup_16<uint8_t>(
// ____[00__] ________
OVERLONG_2 | OVERLONG_3 | OVERLONG_4 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0000] ________
OVERLONG_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0001] ________
TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[01__] ________
TOO_LARGE | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[0100] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[10__] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
// ____[11__] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION,
TOO_LARGE_2 | SURROGATE | TOO_SHORT_2_3_4 | LONELY_CONTINUATION, // ____[1101] ________
TOO_LARGE_2 | TOO_SHORT_2_3_4| LONELY_CONTINUATION,
TOO_LARGE_2 | TOO_SHORT_2_3_4 | LONELY_CONTINUATION
);
return byte_1_high & byte_1_low & byte_2_high;
}
really_inline simd8<uint8_t> check_multibyte_lengths(simd8<uint8_t> input, simd8<uint8_t> prev_input,
simd8<uint8_t> prev1) {
simd8<uint8_t> prev2 = input.prev<2>(prev_input);
simd8<uint8_t> prev3 = input.prev<3>(prev_input);
// is_2_3_continuation uses one more instruction than lookup2
simd8<bool> is_2_3_continuation = (simd8<int8_t>(input).max(simd8<int8_t>(prev1))) < int8_t(-64);
// must_be_2_3_continuation has two fewer instructions than lookup 2
return simd8<uint8_t>(must_be_2_3_continuation(prev2, prev3) ^ is_2_3_continuation);
}
//
// Return nonzero if there are incomplete multibyte characters at the end of the block:
// e.g. if there is a 4-byte character, but it's 3 bytes from the end.
//
really_inline simd8<uint8_t> is_incomplete(simd8<uint8_t> input) {
// If the previous input's last 3 bytes match this, they're too short (they ended at EOF):
// ... 1111____ 111_____ 11______
static const uint8_t max_array[32] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0b11110000u-1, 0b11100000u-1, 0b11000000u-1
};
const simd8<uint8_t> max_value(&max_array[sizeof(max_array)-sizeof(simd8<uint8_t>)]);
return input.gt_bits(max_value);
}
struct utf8_checker {
// If this is nonzero, there has been a UTF-8 error.
simd8<uint8_t> error;
// The last input we received
simd8<uint8_t> prev_input_block;
// Whether the last input we received was incomplete (used for ASCII fast path)
simd8<uint8_t> prev_incomplete;
//
// Check whether the current bytes are valid UTF-8.
//
really_inline void check_utf8_bytes(const simd8<uint8_t> input, const simd8<uint8_t> prev_input) {
// Flip prev1...prev3 so we can easily determine if they are 2+, 3+ or 4+ lead bytes
// (2, 3, 4-byte leads become large positive numbers instead of small negative numbers)
simd8<uint8_t> prev1 = input.prev<1>(prev_input);
this->error |= check_special_cases(input, prev1);
this->error |= check_multibyte_lengths(input, prev_input, prev1);
}
// The only problem that can happen at EOF is that a multibyte character is too short.
really_inline void check_eof() {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
}
really_inline void check_next_input(simd8x64<uint8_t> input) {
if (likely(is_ascii(input))) {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
} else {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
for (int i=1; i<simd8x64<uint8_t>::NUM_CHUNKS; i++) {
this->check_utf8_bytes(input.chunks[i], input.chunks[i-1]);
}
this->prev_incomplete = is_incomplete(input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1]);
this->prev_input_block = input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1];
}
}
really_inline error_code errors() {
return this->error.any_bits_set_anywhere() ? simdjson::UTF8_ERROR : simdjson::SUCCESS;
}
}; // struct utf8_checker
}
using utf8_validation::utf8_checker;
/* end file src/generic/stage1/utf8_lookup3_algorithm.h */
/* begin file src/generic/stage1/json_structural_indexer.h */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace stage1 {
class bit_indexer {
public:
uint32_t *tail;
really_inline bit_indexer(uint32_t *index_buf) : tail(index_buf) {}
// flatten out values in 'bits' assuming that they are are to have values of idx
// plus their position in the bitvector, and store these indexes at
// base_ptr[base] incrementing base as we go
// will potentially store extra values beyond end of valid bits, so base_ptr
// needs to be large enough to handle this
really_inline void write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0)
return;
int cnt = static_cast<int>(count_ones(bits));
// Do the first 8 all together
for (int i=0; i<8; i++) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
// Do the next 8 all together (we hope in most cases it won't happen at all
// and the branch is easily predicted).
if (unlikely(cnt > 8)) {
for (int i=8; i<16; i++) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
// Most files don't have 16+ structurals per block, so we take several basically guaranteed
// branch mispredictions here. 16+ structurals per block means either punctuation ({} [] , :)
// or the start of a value ("abc" true 123) every four characters.
if (unlikely(cnt > 16)) {
int i = 16;
do {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
i++;
} while (i < cnt);
}
}
this->tail += cnt;
}
};
class json_structural_indexer {
public:
/**
* Find the important bits of JSON in a 128-byte chunk, and add them to structural_indexes.
*
* @param partial Setting the partial parameter to true allows the find_structural_bits to
* tolerate unclosed strings. The caller should still ensure that the input is valid UTF-8. If
* you are processing substrings, you may want to call on a function like trimmed_length_safe_utf8.
*/
template<size_t STEP_SIZE>
static error_code index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, bool partial) noexcept;
private:
really_inline json_structural_indexer(uint32_t *structural_indexes);
template<size_t STEP_SIZE>
really_inline void step(const uint8_t *block, buf_block_reader<STEP_SIZE> &reader) noexcept;
really_inline void next(simd::simd8x64<uint8_t> in, json_block block, size_t idx);
really_inline error_code finish(dom_parser_implementation &parser, size_t idx, size_t len, bool partial);
json_scanner scanner{};
utf8_checker checker{};
bit_indexer indexer;
uint64_t prev_structurals = 0;
uint64_t unescaped_chars_error = 0;
};
really_inline json_structural_indexer::json_structural_indexer(uint32_t *structural_indexes) : indexer{structural_indexes} {}
//
// PERF NOTES:
// We pipe 2 inputs through these stages:
// 1. Load JSON into registers. This takes a long time and is highly parallelizable, so we load
// 2 inputs' worth at once so that by the time step 2 is looking for them input, it's available.
// 2. Scan the JSON for critical data: strings, scalars and operators. This is the critical path.
// The output of step 1 depends entirely on this information. These functions don't quite use
// up enough CPU: the second half of the functions is highly serial, only using 1 execution core
// at a time. The second input's scans has some dependency on the first ones finishing it, but
// they can make a lot of progress before they need that information.
// 3. Step 1 doesn't use enough capacity, so we run some extra stuff while we're waiting for that
// to finish: utf-8 checks and generating the output from the last iteration.
//
// The reason we run 2 inputs at a time, is steps 2 and 3 are *still* not enough to soak up all
// available capacity with just one input. Running 2 at a time seems to give the CPU a good enough
// workout.
//
template<size_t STEP_SIZE>
error_code json_structural_indexer::index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, bool partial) noexcept {
if (unlikely(len > parser.capacity())) { return CAPACITY; }
if (partial) { len = trim_partial_utf8(buf, len); }
buf_block_reader<STEP_SIZE> reader(buf, len);
json_structural_indexer indexer(parser.structural_indexes.get());
// Read all but the last block
while (reader.has_full_block()) {
indexer.step<STEP_SIZE>(reader.full_block(), reader);
}
// Take care of the last block (will always be there unless file is empty)
uint8_t block[STEP_SIZE];
if (unlikely(reader.get_remainder(block) == 0)) { return EMPTY; }
indexer.step<STEP_SIZE>(block, reader);
return indexer.finish(parser, reader.block_index(), len, partial);
}
template<>
really_inline void json_structural_indexer::step<128>(const uint8_t *block, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
simd::simd8x64<uint8_t> in_2(block+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1, reader.block_index());
this->next(in_2, block_2, reader.block_index()+64);
reader.advance();
}
template<>
really_inline void json_structural_indexer::step<64>(const uint8_t *block, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
json_block block_1 = scanner.next(in_1);
this->next(in_1, block_1, reader.block_index());
reader.advance();
}
really_inline void json_structural_indexer::next(simd::simd8x64<uint8_t> in, json_block block, size_t idx) {
uint64_t unescaped = in.lteq(0x1F);
checker.check_next_input(in);
indexer.write(uint32_t(idx-64), prev_structurals); // Output *last* iteration's structurals to the parser
prev_structurals = block.structural_start();
unescaped_chars_error |= block.non_quote_inside_string(unescaped);
}
really_inline error_code json_structural_indexer::finish(dom_parser_implementation &parser, size_t idx, size_t len, bool partial) {
// Write out the final iteration's structurals
indexer.write(uint32_t(idx-64), prev_structurals);
error_code error = scanner.finish(partial);
if (unlikely(error != SUCCESS)) { return error; }
if (unescaped_chars_error) {
return UNESCAPED_CHARS;
}
parser.n_structural_indexes = uint32_t(indexer.tail - parser.structural_indexes.get());
/***
* This is related to https://github.com/simdjson/simdjson/issues/906
* Basically, we want to make sure that if the parsing continues beyond the last (valid)
* structural character, it quickly stops.
* Only three structural characters can be repeated without triggering an error in JSON: [,] and }.
* We repeat the padding character (at 'len'). We don't know what it is, but if the parsing
* continues, then it must be [,] or }.
* Suppose it is ] or }. We backtrack to the first character, what could it be that would
* not trigger an error? It could be ] or } but no, because you can't start a document that way.
* It can't be a comma, a colon or any simple value. So the only way we could continue is
* if the repeated character is [. But if so, the document must start with [. But if the document
* starts with [, it should end with ]. If we enforce that rule, then we would get
* ][[ which is invalid.
**/
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 1] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 2] = 0;
parser.next_structural_index = 0;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (unlikely(parser.n_structural_indexes == 0u)) {
return EMPTY;
}
if (unlikely(parser.structural_indexes[parser.n_structural_indexes - 1] > len)) {
return UNEXPECTED_ERROR;
}
if (partial) {
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
return CAPACITY; // If the buffer is partial but the document is incomplete, it's too big to parse.
}
parser.n_structural_indexes = new_structural_indexes;
}
return checker.errors();
}
} // namespace stage1
/* end file src/generic/stage1/json_structural_indexer.h */
WARN_UNUSED error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, bool streaming) noexcept {
this->buf = _buf;
this->len = _len;
return westmere::stage1::json_structural_indexer::index<64>(_buf, _len, *this, streaming);
}
/* begin file src/generic/stage1/utf8_validator.h */
namespace stage1 {
/**
* Validates that the string is actual UTF-8.
*/
template<class checker>
bool generic_validate_utf8(const uint8_t * input, size_t length) {
checker c{};
buf_block_reader<64> reader(input, length);
while (reader.has_full_block()) {
simd::simd8x64<uint8_t> in(reader.full_block());
c.check_next_input(in);
reader.advance();
}
uint8_t block[64]{};
reader.get_remainder(block);
simd::simd8x64<uint8_t> in(block);
c.check_next_input(in);
reader.advance();
return c.errors() == error_code::SUCCESS;
}
bool generic_validate_utf8(const char * input, size_t length) {
return generic_validate_utf8<utf8_checker>((const uint8_t *)input,length);
}
} // namespace stage1
/* end file src/generic/stage1/utf8_validator.h */
WARN_UNUSED bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
return simdjson::westmere::stage1::generic_validate_utf8(buf,len);
}
} // namespace westmere
} // namespace simdjson
UNTARGET_REGION
//
// Stage 2
//
/* begin file src/westmere/stringparsing.h */
#ifndef SIMDJSON_WESTMERE_STRINGPARSING_H
#define SIMDJSON_WESTMERE_STRINGPARSING_H
/* jsoncharutils.h already included: #include "jsoncharutils.h" */
/* westmere/simd.h already included: #include "westmere/simd.h" */
/* westmere/intrinsics.h already included: #include "westmere/intrinsics.h" */
/* westmere/bitmanipulation.h already included: #include "westmere/bitmanipulation.h" */
TARGET_WESTMERE
namespace simdjson {
namespace westmere {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
really_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
really_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
really_inline bool has_backslash() { return bs_bits != 0; }
really_inline int quote_index() { return trailing_zeroes(quote_bits); }
really_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 31 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v0(src);
simd8<uint8_t> v1(src + 16);
v0.store(dst);
v1.store(dst + 16);
uint64_t bs_and_quote = simd8x64<bool>(v0 == '\\', v1 == '\\', v0 == '"', v1 == '"').to_bitmask();
return {
uint32_t(bs_and_quote), // bs_bits
uint32_t(bs_and_quote >> 32) // quote_bits
};
}
/* begin file src/generic/stage2/stringparsing.h */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is include already includes
// "stringparsing.h" (this simplifies amalgation)
namespace stage2 {
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
WARN_UNUSED
really_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion isn't valid; we defer the check for this to inside the
// multilingual plane check
uint32_t code_point = hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// check for low surrogate for characters outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
if (((*src_ptr)[0] != '\\') || (*src_ptr)[1] != 'u') {
return false;
}
uint32_t code_point_2 = hex_to_u32_nocheck(*src_ptr + 2);
// if the first code point is invalid we will get here, as we will go past
// the check for being outside the Basic Multilingual plane. If we don't
// find a \u immediately afterwards we fail out anyhow, but if we do,
// this check catches both the case of the first code point being invalid
// or the second code point being invalid.
if ((code_point | code_point_2) >> 16) {
return false;
}
code_point =
(((code_point - 0xd800) << 10) | (code_point_2 - 0xdc00)) + 0x10000;
*src_ptr += 6;
}
size_t offset = codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
WARN_UNUSED really_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst) {
src++;
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
/* can't be reached */
return nullptr;
}
} // namespace stringparsing
} // namespace stage2
/* end file src/generic/stage2/stringparsing.h */
} // namespace westmere
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_WESTMERE_STRINGPARSING_H
/* end file src/generic/stage2/stringparsing.h */
/* begin file src/westmere/numberparsing.h */
#ifndef SIMDJSON_WESTMERE_NUMBERPARSING_H
#define SIMDJSON_WESTMERE_NUMBERPARSING_H
/* jsoncharutils.h already included: #include "jsoncharutils.h" */
/* westmere/intrinsics.h already included: #include "westmere/intrinsics.h" */
/* westmere/bitmanipulation.h already included: #include "westmere/bitmanipulation.h" */
#include <cmath>
#include <limits>
#ifdef JSON_TEST_NUMBERS // for unit testing
void found_invalid_number(const uint8_t *buf);
void found_integer(int64_t result, const uint8_t *buf);
void found_unsigned_integer(uint64_t result, const uint8_t *buf);
void found_float(double result, const uint8_t *buf);
#endif
TARGET_WESTMERE
namespace simdjson {
namespace westmere {
static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
// this actually computes *16* values so we are being wasteful.
const __m128i ascii0 = _mm_set1_epi8('0');
const __m128i mul_1_10 =
_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
const __m128i mul_1_10000 =
_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
const __m128i input = _mm_sub_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
const __m128i t3 = _mm_packus_epi32(t2, t2);
const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
return _mm_cvtsi128_si32(
t4); // only captures the sum of the first 8 digits, drop the rest
}
#define SWAR_NUMBER_PARSING
/* begin file src/generic/stage2/numberparsing.h */
namespace stage2 {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), false)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), writer.append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), writer.append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), writer.append_double((VALUE)))
#else
#define INVALID_NUMBER(SRC) (false)
#define WRITE_INTEGER(VALUE, SRC, WRITER) writer.append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) writer.append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) writer.append_double((VALUE))
#endif
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [FASTFLOAT_SMALLEST_POWER,
// FASTFLOAT_LARGEST_POWER] interval: the caller is responsible for this check.
really_inline double compute_float_64(int64_t power, uint64_t i, bool negative, bool *success) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991) {
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991) {
#endif
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
double d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / power_of_ten[-power];
} else {
d = d * power_of_ten[power];
}
if (negative) {
d = -d;
}
*success = true;
return d;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It wa
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
return 0.0;
}
// We are going to need to do some 64-bit arithmetic to get a more precise product.
// We use a table lookup approach.
components c =
power_of_ten_components[power - FASTFLOAT_SMALLEST_POWER];
// safe because
// power >= FASTFLOAT_SMALLEST_POWER
// and power <= FASTFLOAT_LARGEST_POWER
// we recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
uint64_t factor_mantissa = c.mantissa;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
value128 product = full_multiplication(i, factor_mantissa);
uint64_t lower = product.low;
uint64_t upper = product.high;
// We know that upper has at most one leading zero because
// both i and factor_mantissa have a leading one. This means
// that the result is at least as large as ((1<<63)*(1<<63))/(1<<64).
// As long as the first 9 bits of "upper" are not "1", then we
// know that we have an exact computed value for the leading
// 55 bits because any imprecision would play out as a +1, in
// the worst case.
if (unlikely((upper & 0x1FF) == 0x1FF) && (lower + i < lower)) {
uint64_t factor_mantissa_low =
mantissa_128[power - FASTFLOAT_SMALLEST_POWER];
// next, we compute the 64-bit x 128-bit multiplication, getting a 192-bit
// result (three 64-bit values)
product = full_multiplication(i, factor_mantissa_low);
uint64_t product_low = product.low;
uint64_t product_middle2 = product.high;
uint64_t product_middle1 = lower;
uint64_t product_high = upper;
uint64_t product_middle = product_middle1 + product_middle2;
if (product_middle < product_middle1) {
product_high++; // overflow carry
}
// We want to check whether mantissa *i + i would affect our result.
// This does happen, e.g. with 7.3177701707893310e+15.
if (((product_middle + 1 == 0) && ((product_high & 0x1FF) == 0x1FF) &&
(product_low + i < product_low))) { // let us be prudent and bail out.
*success = false;
return 0;
}
upper = product_high;
lower = product_middle;
}
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
if (unlikely((lower == 0) && ((upper & 0x1FF) == 0) &&
((mantissa & 3) == 1))) {
// if mantissa & 1 == 1 we might need to round up.
//
// Scenarios:
// 1. We are not in the middle. Then we should round up.
//
// 2. We are right in the middle. Whether we round up depends
// on the last significant bit: if it is "one" then we round
// up (round to even) otherwise, we do not.
//
// So if the last significant bit is 1, we can safely round up.
// Hence we only need to bail out if (mantissa & 3) == 1.
// Otherwise we may need more accuracy or analysis to determine whether
// we are exactly between two floating-point numbers.
// It can be triggered with 1e23.
// Note: because the factor_mantissa and factor_mantissa_low are
// almost always rounded down (except for small positive powers),
// almost always should round up.
*success = false;
return 0;
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
lz--; // undo previous addition
}
mantissa &= ~(1ULL << 52);
uint64_t real_exponent = c.exp - lz;
// we have to check that real_exponent is in range, otherwise we bail out
if (unlikely((real_exponent < 1) || (real_exponent > 2046))) {
*success = false;
return 0;
}
mantissa |= real_exponent << 52;
mantissa |= (((uint64_t)negative) << 63);
double d;
memcpy(&d, &mantissa, sizeof(d));
*success = true;
return d;
}
static bool parse_float_strtod(const char *ptr, double *outDouble) {
char *endptr;
*outDouble = strtod(ptr, &endptr);
// Some libraries will set errno = ERANGE when the value is subnormal,
// yet we may want to be able to parse subnormal values.
// However, we do not want to tolerate NAN or infinite values.
//
// Values like infinity or NaN are not allowed in the JSON specification.
// If you consume a large value and you map it to "infinity", you will no
// longer be able to serialize back a standard-compliant JSON. And there is
// no realistic application where you might need values so large than they
// can't fit in binary64. The maximal value is about 1.7976931348623157 x
// 10^308 It is an unimaginable large number. There will never be any piece of
// engineering involving as many as 10^308 parts. It is estimated that there
// are about 10^80 atoms in the universe. The estimate for the total number
// of electrons is similar. Using a double-precision floating-point value, we
// can represent easily the number of atoms in the universe. We could also
// represent the number of ways you can pick any three individual atoms at
// random in the universe. If you ever encounter a number much larger than
// 10^308, you know that you have a bug. RapidJSON will reject a document with
// a float that does not fit in binary64. JSON for Modern C++ (nlohmann/json)
// will flat out throw an exception.
//
if ((endptr == ptr) || (!std::isfinite(*outDouble))) {
return false;
}
return true;
}
really_inline bool is_integer(char c) {
return (c >= '0' && c <= '9');
// this gets compiled to (uint8_t)(c - '0') <= 9 on all decent compilers
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
really_inline bool is_made_of_eight_digits_fast(const char *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename W>
bool slow_float_parsing(UNUSED const char * src, W writer) {
double d;
if (parse_float_strtod(src, &d)) {
WRITE_DOUBLE(d, (const uint8_t *)src, writer);
return true;
}
return INVALID_NUMBER((const uint8_t *)src);
}
really_inline bool parse_decimal(UNUSED const uint8_t *const src, const char *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const char *const first_after_period = p;
if (!is_integer(*p)) { return INVALID_NUMBER(src); } // There must be at least one digit after the .
unsigned char digit = static_cast<unsigned char>(*p - '0');
++p;
i = i * 10 + digit; // might overflow + multiplication by 10 is likely
// cheaper than arbitrary mult.
// we will handle the overflow later
#ifdef SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif
while (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
++p;
i = i * 10 + digit; // in rare cases, this will overflow, but that's ok
// because we have parse_highprecision_float later.
}
exponent = first_after_period - p;
return true;
}
really_inline bool parse_exponent(UNUSED const uint8_t *const src, const char *&p, int64_t &exponent) {
bool neg_exp = false;
if ('-' == *p) {
neg_exp = true;
++p;
} else if ('+' == *p) {
++p;
}
// e[+-] must be followed by a number
if (!is_integer(*p)) { return INVALID_NUMBER(src); }
unsigned char digit = static_cast<unsigned char>(*p - '0');
int64_t exp_number = digit;
p++;
if (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
if (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
while (is_integer(*p)) {
// we need to check for overflows; we refuse to parse this
if (exp_number > 0x100000000) { return INVALID_NUMBER(src); }
digit = static_cast<unsigned char>(*p - '0');
exp_number = 10 * exp_number + digit;
++p;
}
exponent += (neg_exp ? -exp_number : exp_number);
return true;
}
template<typename W>
really_inline bool write_float(const uint8_t *const src, bool negative, uint64_t i, const char * start_digits, int digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
// digit count is off by 1 because of the decimal (assuming there was one).
if (unlikely((digit_count-1 >= 19))) { // this is uncommon
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const char *start = start_digits;
while ((*start == '0') || (*start == '.')) {
start++;
}
// we over-decrement by one when there is a '.'
digit_count -= int(start - start_digits);
if (digit_count >= 19) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
bool success = slow_float_parsing((const char *) src, writer);
// The number was already written, but we made a copy of the writer
// when we passed it to the parse_large_integer() function, so
writer.skip_double();
return success;
}
}
// NOTE: it's weird that the unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (unlikely(exponent < FASTFLOAT_SMALLEST_POWER) || (exponent > FASTFLOAT_LARGEST_POWER)) {
// this is almost never going to get called!!!
// we start anew, going slowly!!!
bool success = slow_float_parsing((const char *) src, writer);
// The number was already written, but we made a copy of the writer when we passed it to the
// slow_float_parsing() function, so we have to skip those tape spots now that we've returned
writer.skip_double();
return success;
}
bool success = true;
double d = compute_float_64(exponent, i, negative, &success);
if (!success) {
// we are almost never going to get here.
if (!parse_float_strtod((const char *)src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return true;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
really_inline bool parse_number(UNUSED const uint8_t *const src,
UNUSED bool found_minus,
W &writer) {
#ifdef SIMDJSON_SKIPNUMBERPARSING // for performance analysis, it is sometimes
// useful to skip parsing
writer.append_s64(0); // always write zero
return true; // always succeeds
#else
const char *p = reinterpret_cast<const char *>(src);
bool negative = false;
if (found_minus) {
++p;
negative = true;
// a negative sign must be followed by an integer
if (!is_integer(*p)) { return INVALID_NUMBER(src); }
}
const char *const start_digits = p;
uint64_t i; // an unsigned int avoids signed overflows (which are bad)
if (*p == '0') {
++p;
if (is_integer(*p)) { return INVALID_NUMBER(src); } // 0 cannot be followed by an integer
i = 0;
} else {
// NOTE: This is a redundant check--either we're negative, in which case we checked whether this
// is a digit above, or the caller already determined we start with a digit. But removing this
// check seems to make things slower: https://github.com/simdjson/simdjson/pull/990#discussion_r448512448
// Please do try yourself, or think of ways to explain it--we'd love to understand :)
if (!is_integer(*p)) { return INVALID_NUMBER(src); } // must start with an integer
unsigned char digit = static_cast<unsigned char>(*p - '0');
i = digit;
p++;
// the is_made_of_eight_digits_fast routine is unlikely to help here because
// we rarely see large integer parts like 123456789
while (is_integer(*p)) {
digit = static_cast<unsigned char>(*p - '0');
// a multiplication by 10 is cheaper than an arbitrary integer
// multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
++p;
}
}
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
if (!parse_decimal(src, p, i, exponent)) { return false; }
}
int digit_count = int(p - start_digits); // used later to guard against overflows
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
if (!parse_exponent(src, p, exponent)) { return false; }
}
if (is_float) {
return write_float(src, negative, i, start_digits, digit_count, exponent, writer);
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
int longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return INVALID_NUMBER(src); }
if (digit_count == longest_digit_count) {
// Anything negative above INT64_MAX is either invalid or INT64_MIN.
if (negative && i > uint64_t(INT64_MAX)) {
// If the number is negative and can't fit in a signed integer, it's invalid.
if (i > uint64_t(INT64_MAX)+1) { return INVALID_NUMBER(src); }
// If it's negative, it has to be INT64_MAX+1 now (or INT64_MIN).
// C++ can't reliably negate uint64_t INT64_MIN, it seems. Special case it.
WRITE_INTEGER(INT64_MIN, src, writer);
return is_structural_or_whitespace(*p);
}
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to 9,223,372,036,854,775,808 (INT64_MAX).
//
if (!negative && (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX))) { return INVALID_NUMBER(src); }
}
// Write unsigned if it doesn't fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? 0 - i : i, src, writer);
}
return is_structural_or_whitespace(*p);
#endif // SIMDJSON_SKIPNUMBERPARSING
}
} // namespace numberparsing
} // namespace stage2
/* end file src/generic/stage2/numberparsing.h */
} // namespace westmere
} // namespace simdjson
UNTARGET_REGION
#endif // SIMDJSON_WESTMERE_NUMBERPARSING_H
/* end file src/generic/stage2/numberparsing.h */
TARGET_WESTMERE
namespace simdjson {
namespace westmere {
/* begin file src/generic/stage2/logger.h */
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
static constexpr const bool LOG_ENABLED = false;
static constexpr const int LOG_EVENT_LEN = 30;
static constexpr const int LOG_BUFFER_LEN = 20;
static constexpr const int LOG_DETAIL_LEN = 50;
static constexpr const int LOG_INDEX_LEN = 10;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static really_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static really_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %*s | %*s | %*s | %-*s | %-*s | %-*s |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", 4, "Curr", 4, "Next", 5, "Next#", 5, "Tape#", LOG_DETAIL_LEN, "Detail", LOG_INDEX_LEN, "index");
printf("|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|%.*s|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, 4+2, DASHES, 4+2, DASHES, 5+2, DASHES, 5+2, DASHES, LOG_DETAIL_LEN+2, DASHES, LOG_INDEX_LEN+2, DASHES);
}
}
static really_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line of
template<typename S>
static really_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(structurals.current()[i]));
}
printf(" ");
}
printf("| %c ", printable_char(structurals.current_char()));
printf("| %c ", printable_char(structurals.peek_next_char()));
printf("| %5u ", structurals.parser.structural_indexes[*(structurals.current_structural+1)]);
printf("| %5u ", structurals.next_tape_index());
printf("| %-*s ", LOG_DETAIL_LEN, detail);
printf("| %*u ", LOG_INDEX_LEN, *structurals.current_structural);
printf("|\n");
}
}
} // namespace logger
/* end file src/generic/stage2/logger.h */
/* begin file src/generic/stage2/atomparsing.h */
namespace stage2 {
namespace atomparsing {
really_inline uint32_t string_to_uint32(const char* str) { return *reinterpret_cast<const uint32_t *>(str); }
WARN_UNUSED
really_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 64-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | is_not_structural_or_whitespace(src[5])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // namespace stage2
/* end file src/generic/stage2/atomparsing.h */
/* begin file src/generic/stage2/structural_iterator.h */
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *current_structural;
dom_parser_implementation &parser;
// Start a structural
really_inline structural_iterator(dom_parser_implementation &_parser, size_t start_structural_index)
: buf{_parser.buf},
current_structural{&_parser.structural_indexes[start_structural_index]},
parser{_parser} {
}
// Get the buffer position of the current structural character
really_inline const uint8_t* current() {
return &buf[*current_structural];
}
// Get the current structural character
really_inline char current_char() {
return buf[*current_structural];
}
// Get the next structural character without advancing
really_inline char peek_next_char() {
return buf[*(current_structural+1)];
}
really_inline char advance_char() {
current_structural++;
return buf[*current_structural];
}
really_inline size_t remaining_len() {
return parser.len - *current_structural;
}
really_inline bool past_end(uint32_t n_structural_indexes) {
return current_structural >= &parser.structural_indexes[n_structural_indexes];
}
really_inline bool at_end(uint32_t n_structural_indexes) {
return current_structural == &parser.structural_indexes[n_structural_indexes];
}
really_inline bool at_beginning() {
return current_structural == parser.structural_indexes.get();
}
};
} // namespace stage2
/* end file src/generic/stage2/structural_iterator.h */
/* begin file src/generic/stage2/structural_parser.h */
// This file contains the common code every implementation uses for stage2
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is include already includes
// "simdjson/stage2.h" (this simplifies amalgation)
namespace stage2 {
namespace { // Make everything here private
/* begin file src/generic/stage2/tape_writer.h */
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
really_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
really_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
really_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
really_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
really_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
really_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
really_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
really_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
really_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct number_writer
really_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
really_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
really_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
really_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
really_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
really_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
really_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
really_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
really_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
/* end file src/generic/stage2/tape_writer.h */
#ifdef SIMDJSON_USE_COMPUTED_GOTO
#define INIT_ADDRESSES() { &&array_begin, &&array_continue, &&error, &&finish, &&object_begin, &&object_continue }
#define GOTO(address) { goto *(address); }
#define CONTINUE(address) { goto *(address); }
#else // SIMDJSON_USE_COMPUTED_GOTO
#define INIT_ADDRESSES() { '[', 'a', 'e', 'f', '{', 'o' };
#define GOTO(address) \
{ \
switch(address) { \
case '[': goto array_begin; \
case 'a': goto array_continue; \
case 'e': goto error; \
case 'f': goto finish; \
case '{': goto object_begin; \
case 'o': goto object_continue; \
} \
}
// For the more constrained end_xxx() situation
#define CONTINUE(address) \
{ \
switch(address) { \
case 'a': goto array_continue; \
case 'o': goto object_continue; \
case 'f': goto finish; \
} \
}
#endif // SIMDJSON_USE_COMPUTED_GOTO
struct unified_machine_addresses {
ret_address_t array_begin;
ret_address_t array_continue;
ret_address_t error;
ret_address_t finish;
ret_address_t object_begin;
ret_address_t object_continue;
};
#undef FAIL_IF
#define FAIL_IF(EXPR) { if (EXPR) { return addresses.error; } }
struct structural_parser : structural_iterator {
/** Lets you append to the tape */
tape_writer tape;
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
/** Current depth (nested objects and arrays) */
uint32_t depth{0};
// For non-streaming, to pass an explicit 0 as next_structural, which enables optimizations
really_inline structural_parser(dom_parser_implementation &_parser, uint32_t start_structural_index)
: structural_iterator(_parser, start_structural_index),
tape{parser.doc->tape.get()},
current_string_buf_loc{parser.doc->string_buf.get()} {
}
WARN_UNUSED really_inline bool start_scope(ret_address_t continue_state) {
parser.containing_scope[depth].tape_index = next_tape_index();
parser.containing_scope[depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
parser.ret_address[depth] = continue_state;
depth++;
bool exceeded_max_depth = depth >= parser.max_depth();
if (exceeded_max_depth) { log_error("Exceeded max depth!"); }
return exceeded_max_depth;
}
WARN_UNUSED really_inline bool start_document(ret_address_t continue_state) {
log_start_value("document");
return start_scope(continue_state);
}
WARN_UNUSED really_inline bool start_object(ret_address_t continue_state) {
log_start_value("object");
return start_scope(continue_state);
}
WARN_UNUSED really_inline bool start_array(ret_address_t continue_state) {
log_start_value("array");
return start_scope(continue_state);
}
// this function is responsible for annotating the start of the scope
really_inline void end_scope(internal::tape_type start, internal::tape_type end) noexcept {
depth--;
// write our doc->tape location to the header scope
// The root scope gets written *at* the previous location.
tape.append(parser.containing_scope[depth].tape_index, end);
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t start_tape_index = parser.containing_scope[depth].tape_index;
const uint32_t count = parser.containing_scope[depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
// This is a load and an OR. It would be possible to just write once at doc->tape[d.tape_index]
tape_writer::write(parser.doc->tape[start_tape_index], next_tape_index() | (uint64_t(cntsat) << 32), start);
}
really_inline uint32_t next_tape_index() {
return uint32_t(tape.next_tape_loc - parser.doc->tape.get());
}
really_inline void end_object() {
log_end_value("object");
end_scope(internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
really_inline void end_array() {
log_end_value("array");
end_scope(internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
really_inline void end_document() {
log_end_value("document");
end_scope(internal::tape_type::ROOT, internal::tape_type::ROOT);
}
// increment_count increments the count of keys in an object or values in an array.
// Note that if you are at the level of the values or elements, the count
// must be increment in the preceding depth (depth-1) where the array or
// the object resides.
really_inline void increment_count() {
parser.containing_scope[depth - 1].count++; // we have a key value pair in the object at parser.depth - 1
}
really_inline uint8_t *on_start_string() noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
really_inline void on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
WARN_UNUSED really_inline bool parse_string(bool key = false) {
log_value(key ? "key" : "string");
uint8_t *dst = on_start_string();
dst = stringparsing::parse_string(current(), dst);
if (dst == nullptr) {
log_error("Invalid escape in string");
return true;
}
on_end_string(dst);
return false;
}
WARN_UNUSED really_inline bool parse_number(const uint8_t *src, bool found_minus) {
log_value("number");
bool succeeded = numberparsing::parse_number(src, found_minus, tape);
if (!succeeded) { log_error("Invalid number"); }
return !succeeded;
}
WARN_UNUSED really_inline bool parse_number(bool found_minus) {
return parse_number(current(), found_minus);
}
really_inline bool parse_number_with_space_terminated_copy(const bool is_negative) {
/**
* We need to make a copy to make sure that the string is space terminated.
* This is not about padding the input, which should already padded up
* to len + SIMDJSON_PADDING. However, we have no control at this stage
* on how the padding was done. What if the input string was padded with nulls?
* It is quite common for an input string to have an extra null character (C string).
* We do not want to allow 9\0 (where \0 is the null character) inside a JSON
* document, but the string "9\0" by itself is fine. So we make a copy and
* pad the input with spaces when we know that there is just one input element.
* This copy is relatively expensive, but it will almost never be called in
* practice unless you are in the strange scenario where you have many JSON
* documents made of single atoms.
*/
uint8_t *copy = static_cast<uint8_t *>(malloc(parser.len + SIMDJSON_PADDING));
if (copy == nullptr) {
return true;
}
memcpy(copy, buf, parser.len);
memset(copy + parser.len, ' ', SIMDJSON_PADDING);
size_t idx = *current_structural;
bool result = parse_number(&copy[idx], is_negative); // parse_number does not throw
free(copy);
return result;
}
WARN_UNUSED really_inline ret_address_t parse_value(const unified_machine_addresses &addresses, ret_address_t continue_state) {
switch (advance_char()) {
case '"':
FAIL_IF( parse_string() );
return continue_state;
case 't':
log_value("true");
FAIL_IF( !atomparsing::is_valid_true_atom(current()) );
tape.append(0, internal::tape_type::TRUE_VALUE);
return continue_state;
case 'f':
log_value("false");
FAIL_IF( !atomparsing::is_valid_false_atom(current()) );
tape.append(0, internal::tape_type::FALSE_VALUE);
return continue_state;
case 'n':
log_value("null");
FAIL_IF( !atomparsing::is_valid_null_atom(current()) );
tape.append(0, internal::tape_type::NULL_VALUE);
return continue_state;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
FAIL_IF( parse_number(false) );
return continue_state;
case '-':
FAIL_IF( parse_number(true) );
return continue_state;
case '{':
FAIL_IF( start_object(continue_state) );
return addresses.object_begin;
case '[':
FAIL_IF( start_array(continue_state) );
return addresses.array_begin;
default:
log_error("Non-value found when value was expected!");
return addresses.error;
}
}
WARN_UNUSED really_inline error_code finish() {
end_document();
parser.next_structural_index = uint32_t(current_structural + 1 - &parser.structural_indexes[0]);
if (depth != 0) {
log_error("Unclosed objects or arrays!");
return parser.error = TAPE_ERROR;
}
return SUCCESS;
}
WARN_UNUSED really_inline error_code error() {
/* We do not need the next line because this is done by parser.init_stage2(),
* pessimistically.
* parser.is_valid = false;
* At this point in the code, we have all the time in the world.
* Note that we know exactly where we are in the document so we could,
* without any overhead on the processing code, report a specific
* location.
* We could even trigger special code paths to assess what happened
* carefully,
* all without any added cost. */
if (depth >= parser.max_depth()) {
return parser.error = DEPTH_ERROR;
}
switch (current_char()) {
case '"':
return parser.error = STRING_ERROR;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '-':
return parser.error = NUMBER_ERROR;
case 't':
return parser.error = T_ATOM_ERROR;
case 'n':
return parser.error = N_ATOM_ERROR;
case 'f':
return parser.error = F_ATOM_ERROR;
default:
return parser.error = TAPE_ERROR;
}
}
really_inline void init() {
log_start();
parser.error = UNINITIALIZED;
}
WARN_UNUSED really_inline error_code start(ret_address_t finish_state) {
// If there are no structurals left, return EMPTY
if (at_end(parser.n_structural_indexes)) {
return parser.error = EMPTY;
}
init();
// Push the root scope (there is always at least one scope)
if (start_document(finish_state)) {
return parser.error = DEPTH_ERROR;
}
return SUCCESS;
}
really_inline void log_value(const char *type) {
logger::log_line(*this, "", type, "");
}
static really_inline void log_start() {
logger::log_start();
}
really_inline void log_start_value(const char *type) {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
really_inline void log_end_value(const char *type) {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
really_inline void log_error(const char *error) {
logger::log_line(*this, "", "ERROR", error);
}
}; // struct structural_parser
// Redefine FAIL_IF to use goto since it'll be used inside the function now
#undef FAIL_IF
#define FAIL_IF(EXPR) { if (EXPR) { goto error; } }
template<bool STREAMING>
WARN_UNUSED static error_code parse_structurals(dom_parser_implementation &dom_parser, dom::document &doc) noexcept {
dom_parser.doc = &doc;
static constexpr stage2::unified_machine_addresses addresses = INIT_ADDRESSES();
stage2::structural_parser parser(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
error_code result = parser.start(addresses.finish);
if (result) { return result; }
//
// Read first value
//
switch (parser.current_char()) {
case '{':
FAIL_IF( parser.start_object(addresses.finish) );
goto object_begin;
case '[':
FAIL_IF( parser.start_array(addresses.finish) );
// Make sure the outer array is closed before continuing; otherwise, there are ways we could get
// into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
if (parser.buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]] != ']') {
goto error;
}
}
goto array_begin;
case '"':
FAIL_IF( parser.parse_string() );
goto finish;
case 't':
parser.log_value("true");
FAIL_IF( !atomparsing::is_valid_true_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::TRUE_VALUE);
goto finish;
case 'f':
parser.log_value("false");
FAIL_IF( !atomparsing::is_valid_false_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::FALSE_VALUE);
goto finish;
case 'n':
parser.log_value("null");
FAIL_IF( !atomparsing::is_valid_null_atom(parser.current(), parser.remaining_len()) );
parser.tape.append(0, internal::tape_type::NULL_VALUE);
goto finish;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
// Next line used to be an interesting functional programming exercise with
// a lambda that gets passed to another function via a closure. This would confuse the
// clangcl compiler under Visual Studio 2019 (recent release).
{ if(parser.parse_number_with_space_terminated_copy(false)) { goto error; }}
goto finish;
case '-':
// Next line used to be an interesting functional programming exercise with
// a lambda that gets passed to another function via a closure. This would confuse the
// clangcl compiler under Visual Studio 2019 (recent release).
{ if(parser.parse_number_with_space_terminated_copy(true)) { goto error; }}
goto finish;
default:
parser.log_error("Document starts with a non-value character");
goto error;
}
//
// Object parser states
//
object_begin:
switch (parser.advance_char()) {
case '"': {
parser.increment_count();
FAIL_IF( parser.parse_string(true) );
goto object_key_state;
}
case '}':
parser.end_object();
goto scope_end;
default:
parser.log_error("Object does not start with a key");
goto error;
}
object_key_state:
if (parser.advance_char() != ':' ) { parser.log_error("Missing colon after key in object"); goto error; }
GOTO( parser.parse_value(addresses, addresses.object_continue) );
object_continue:
switch (parser.advance_char()) {
case ',':
parser.increment_count();
if (parser.advance_char() != '"' ) { parser.log_error("Key string missing at beginning of field in object"); goto error; }
FAIL_IF( parser.parse_string(true) );
goto object_key_state;
case '}':
parser.end_object();
goto scope_end;
default:
parser.log_error("No comma between object fields");
goto error;
}
scope_end:
CONTINUE( parser.parser.ret_address[parser.depth] );
//
// Array parser states
//
array_begin:
if (parser.peek_next_char() == ']') {
parser.advance_char();
parser.end_array();
goto scope_end;
}
parser.increment_count();
main_array_switch:
/* we call update char on all paths in, so we can peek at parser.c on the
* on paths that can accept a close square brace (post-, and at start) */
GOTO( parser.parse_value(addresses, addresses.array_continue) );
array_continue:
switch (parser.advance_char()) {
case ',':
parser.increment_count();
goto main_array_switch;
case ']':
parser.end_array();
goto scope_end;
default:
parser.log_error("Missing comma between array values");
goto error;
}
finish:
return parser.finish();
error:
return parser.error();
}
} // namespace {}
} // namespace stage2
/************
* The JSON is parsed to a tape, see the accompanying tape.md file
* for documentation.
***********/
WARN_UNUSED error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
error_code result = stage2::parse_structurals<false>(*this, _doc);
if (result) { return result; }
// If we didn't make it to the end, it's an error
if ( next_structural_index != n_structural_indexes ) {
logger::log_string("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return error = TAPE_ERROR;
}
return SUCCESS;
}
/************
* The JSON is parsed to a tape, see the accompanying tape.md file
* for documentation.
***********/
WARN_UNUSED error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::parse_structurals<true>(*this, _doc);
}
/* end file src/generic/stage2/tape_writer.h */
WARN_UNUSED error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
error_code err = stage1(_buf, _len, false);
if (err) { return err; }
return stage2(_doc);
}
} // namespace westmere
} // namespace simdjson
UNTARGET_REGION
/* end file src/generic/stage2/tape_writer.h */
#endif
SIMDJSON_POP_DISABLE_WARNINGS
/* end file src/generic/stage2/tape_writer.h */
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