687 lines
19 KiB
C++
687 lines
19 KiB
C++
//===-- Args.cpp ------------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Utility/Args.h"
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#include "lldb/Utility/ConstString.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/Stream.h"
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#include "lldb/Utility/StringList.h"
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#include "llvm/ADT/StringSwitch.h"
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using namespace lldb;
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using namespace lldb_private;
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// A helper function for argument parsing.
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// Parses the initial part of the first argument using normal double quote
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// rules: backslash escapes the double quote and itself. The parsed string is
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// appended to the second argument. The function returns the unparsed portion
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// of the string, starting at the closing quote.
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static llvm::StringRef ParseDoubleQuotes(llvm::StringRef quoted,
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std::string &result) {
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// Inside double quotes, '\' and '"' are special.
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static const char *k_escapable_characters = "\"\\";
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while (true) {
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// Skip over over regular characters and append them.
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size_t regular = quoted.find_first_of(k_escapable_characters);
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result += quoted.substr(0, regular);
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quoted = quoted.substr(regular);
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// If we have reached the end of string or the closing quote, we're done.
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if (quoted.empty() || quoted.front() == '"')
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break;
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// We have found a backslash.
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quoted = quoted.drop_front();
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if (quoted.empty()) {
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// A lone backslash at the end of string, let's just append it.
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result += '\\';
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break;
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}
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// If the character after the backslash is not a whitelisted escapable
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// character, we leave the character sequence untouched.
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if (strchr(k_escapable_characters, quoted.front()) == nullptr)
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result += '\\';
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result += quoted.front();
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quoted = quoted.drop_front();
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}
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return quoted;
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}
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static size_t ArgvToArgc(const char **argv) {
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if (!argv)
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return 0;
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size_t count = 0;
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while (*argv++)
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++count;
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return count;
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}
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// Trims all whitespace that can separate command line arguments from the left
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// side of the string.
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static llvm::StringRef ltrimForArgs(llvm::StringRef str) {
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static const char *k_space_separators = " \t";
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return str.ltrim(k_space_separators);
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}
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// A helper function for SetCommandString. Parses a single argument from the
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// command string, processing quotes and backslashes in a shell-like manner.
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// The function returns a tuple consisting of the parsed argument, the quote
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// char used, and the unparsed portion of the string starting at the first
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// unqouted, unescaped whitespace character.
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static std::tuple<std::string, char, llvm::StringRef>
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ParseSingleArgument(llvm::StringRef command) {
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// Argument can be split into multiple discontiguous pieces, for example:
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// "Hello ""World"
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// this would result in a single argument "Hello World" (without the quotes)
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// since the quotes would be removed and there is not space between the
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// strings.
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std::string arg;
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// Since we can have multiple quotes that form a single command in a command
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// like: "Hello "world'!' (which will make a single argument "Hello world!")
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// we remember the first quote character we encounter and use that for the
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// quote character.
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char first_quote_char = '\0';
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bool arg_complete = false;
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do {
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// Skip over over regular characters and append them.
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size_t regular = command.find_first_of(" \t\r\"'`\\");
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arg += command.substr(0, regular);
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command = command.substr(regular);
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if (command.empty())
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break;
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char special = command.front();
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command = command.drop_front();
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switch (special) {
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case '\\':
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if (command.empty()) {
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arg += '\\';
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break;
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}
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// If the character after the backslash is not a whitelisted escapable
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// character, we leave the character sequence untouched.
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if (strchr(" \t\\'\"`", command.front()) == nullptr)
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arg += '\\';
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arg += command.front();
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command = command.drop_front();
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break;
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case ' ':
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case '\t':
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case '\r':
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// We are not inside any quotes, we just found a space after an argument.
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// We are done.
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arg_complete = true;
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break;
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case '"':
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case '\'':
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case '`':
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// We found the start of a quote scope.
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if (first_quote_char == '\0')
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first_quote_char = special;
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if (special == '"')
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command = ParseDoubleQuotes(command, arg);
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else {
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// For single quotes, we simply skip ahead to the matching quote
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// character (or the end of the string).
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size_t quoted = command.find(special);
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arg += command.substr(0, quoted);
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command = command.substr(quoted);
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}
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// If we found a closing quote, skip it.
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if (!command.empty())
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command = command.drop_front();
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break;
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}
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} while (!arg_complete);
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return std::make_tuple(arg, first_quote_char, command);
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}
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Args::ArgEntry::ArgEntry(llvm::StringRef str, char quote) : quote(quote) {
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size_t size = str.size();
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ptr.reset(new char[size + 1]);
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::memcpy(data(), str.data() ? str.data() : "", size);
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ptr[size] = 0;
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}
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// Args constructor
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Args::Args(llvm::StringRef command) { SetCommandString(command); }
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Args::Args(const Args &rhs) { *this = rhs; }
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Args::Args(const StringList &list) : Args() {
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for (const std::string &arg : list)
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AppendArgument(arg);
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}
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Args &Args::operator=(const Args &rhs) {
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Clear();
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m_argv.clear();
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m_entries.clear();
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for (auto &entry : rhs.m_entries) {
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m_entries.emplace_back(entry.ref(), entry.quote);
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m_argv.push_back(m_entries.back().data());
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}
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m_argv.push_back(nullptr);
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return *this;
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}
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// Destructor
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Args::~Args() {}
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void Args::Dump(Stream &s, const char *label_name) const {
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if (!label_name)
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return;
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int i = 0;
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for (auto &entry : m_entries) {
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s.Indent();
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s.Format("{0}[{1}]=\"{2}\"\n", label_name, i++, entry.ref());
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}
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s.Format("{0}[{1}]=NULL\n", label_name, i);
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s.EOL();
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}
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bool Args::GetCommandString(std::string &command) const {
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command.clear();
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for (size_t i = 0; i < m_entries.size(); ++i) {
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if (i > 0)
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command += ' ';
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command += m_entries[i].ref();
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}
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return !m_entries.empty();
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}
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bool Args::GetQuotedCommandString(std::string &command) const {
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command.clear();
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for (size_t i = 0; i < m_entries.size(); ++i) {
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if (i > 0)
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command += ' ';
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if (m_entries[i].quote) {
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command += m_entries[i].quote;
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command += m_entries[i].ref();
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command += m_entries[i].quote;
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} else {
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command += m_entries[i].ref();
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}
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}
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return !m_entries.empty();
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}
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void Args::SetCommandString(llvm::StringRef command) {
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Clear();
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m_argv.clear();
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command = ltrimForArgs(command);
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std::string arg;
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char quote;
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while (!command.empty()) {
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std::tie(arg, quote, command) = ParseSingleArgument(command);
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m_entries.emplace_back(arg, quote);
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m_argv.push_back(m_entries.back().data());
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command = ltrimForArgs(command);
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}
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m_argv.push_back(nullptr);
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}
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size_t Args::GetArgumentCount() const { return m_entries.size(); }
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const char *Args::GetArgumentAtIndex(size_t idx) const {
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if (idx < m_argv.size())
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return m_argv[idx];
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return nullptr;
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}
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char **Args::GetArgumentVector() {
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assert(!m_argv.empty());
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// TODO: functions like execve and posix_spawnp exhibit undefined behavior
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// when argv or envp is null. So the code below is actually wrong. However,
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// other code in LLDB depends on it being null. The code has been acting
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// this way for some time, so it makes sense to leave it this way until
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// someone has the time to come along and fix it.
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return (m_argv.size() > 1) ? m_argv.data() : nullptr;
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}
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const char **Args::GetConstArgumentVector() const {
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assert(!m_argv.empty());
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return (m_argv.size() > 1) ? const_cast<const char **>(m_argv.data())
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: nullptr;
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}
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void Args::Shift() {
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// Don't pop the last NULL terminator from the argv array
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if (m_entries.empty())
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return;
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m_argv.erase(m_argv.begin());
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m_entries.erase(m_entries.begin());
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}
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void Args::Unshift(llvm::StringRef arg_str, char quote_char) {
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InsertArgumentAtIndex(0, arg_str, quote_char);
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}
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void Args::AppendArguments(const Args &rhs) {
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assert(m_argv.size() == m_entries.size() + 1);
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assert(m_argv.back() == nullptr);
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m_argv.pop_back();
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for (auto &entry : rhs.m_entries) {
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m_entries.emplace_back(entry.ref(), entry.quote);
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m_argv.push_back(m_entries.back().data());
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}
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m_argv.push_back(nullptr);
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}
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void Args::AppendArguments(const char **argv) {
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size_t argc = ArgvToArgc(argv);
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assert(m_argv.size() == m_entries.size() + 1);
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assert(m_argv.back() == nullptr);
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m_argv.pop_back();
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for (auto arg : llvm::makeArrayRef(argv, argc)) {
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m_entries.emplace_back(arg, '\0');
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m_argv.push_back(m_entries.back().data());
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}
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m_argv.push_back(nullptr);
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}
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void Args::AppendArgument(llvm::StringRef arg_str, char quote_char) {
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InsertArgumentAtIndex(GetArgumentCount(), arg_str, quote_char);
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}
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void Args::InsertArgumentAtIndex(size_t idx, llvm::StringRef arg_str,
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char quote_char) {
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assert(m_argv.size() == m_entries.size() + 1);
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assert(m_argv.back() == nullptr);
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if (idx > m_entries.size())
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return;
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m_entries.emplace(m_entries.begin() + idx, arg_str, quote_char);
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m_argv.insert(m_argv.begin() + idx, m_entries[idx].data());
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}
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void Args::ReplaceArgumentAtIndex(size_t idx, llvm::StringRef arg_str,
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char quote_char) {
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assert(m_argv.size() == m_entries.size() + 1);
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assert(m_argv.back() == nullptr);
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if (idx >= m_entries.size())
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return;
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m_entries[idx] = ArgEntry(arg_str, quote_char);
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m_argv[idx] = m_entries[idx].data();
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}
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void Args::DeleteArgumentAtIndex(size_t idx) {
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if (idx >= m_entries.size())
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return;
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m_argv.erase(m_argv.begin() + idx);
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m_entries.erase(m_entries.begin() + idx);
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}
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void Args::SetArguments(size_t argc, const char **argv) {
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Clear();
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auto args = llvm::makeArrayRef(argv, argc);
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m_entries.resize(argc);
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m_argv.resize(argc + 1);
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for (size_t i = 0; i < args.size(); ++i) {
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char quote =
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((args[i][0] == '\'') || (args[i][0] == '"') || (args[i][0] == '`'))
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? args[i][0]
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: '\0';
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m_entries[i] = ArgEntry(args[i], quote);
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m_argv[i] = m_entries[i].data();
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}
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}
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void Args::SetArguments(const char **argv) {
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SetArguments(ArgvToArgc(argv), argv);
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}
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void Args::Clear() {
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m_entries.clear();
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m_argv.clear();
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m_argv.push_back(nullptr);
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}
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const char *Args::GetShellSafeArgument(const FileSpec &shell,
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const char *unsafe_arg,
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std::string &safe_arg) {
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struct ShellDescriptor {
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ConstString m_basename;
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const char *m_escapables;
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};
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static ShellDescriptor g_Shells[] = {{ConstString("bash"), " '\"<>()&"},
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{ConstString("tcsh"), " '\"<>()&$"},
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{ConstString("sh"), " '\"<>()&"}};
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// safe minimal set
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const char *escapables = " '\"";
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if (auto basename = shell.GetFilename()) {
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for (const auto &Shell : g_Shells) {
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if (Shell.m_basename == basename) {
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escapables = Shell.m_escapables;
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break;
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}
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}
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}
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safe_arg.assign(unsafe_arg);
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size_t prev_pos = 0;
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while (prev_pos < safe_arg.size()) {
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// Escape spaces and quotes
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size_t pos = safe_arg.find_first_of(escapables, prev_pos);
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if (pos != std::string::npos) {
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safe_arg.insert(pos, 1, '\\');
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prev_pos = pos + 2;
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} else
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break;
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}
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return safe_arg.c_str();
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}
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lldb::Encoding Args::StringToEncoding(llvm::StringRef s,
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lldb::Encoding fail_value) {
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return llvm::StringSwitch<lldb::Encoding>(s)
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.Case("uint", eEncodingUint)
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.Case("sint", eEncodingSint)
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.Case("ieee754", eEncodingIEEE754)
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.Case("vector", eEncodingVector)
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.Default(fail_value);
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}
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uint32_t Args::StringToGenericRegister(llvm::StringRef s) {
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if (s.empty())
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return LLDB_INVALID_REGNUM;
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uint32_t result = llvm::StringSwitch<uint32_t>(s)
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.Case("pc", LLDB_REGNUM_GENERIC_PC)
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.Case("sp", LLDB_REGNUM_GENERIC_SP)
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.Case("fp", LLDB_REGNUM_GENERIC_FP)
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.Cases("ra", "lr", LLDB_REGNUM_GENERIC_RA)
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.Case("flags", LLDB_REGNUM_GENERIC_FLAGS)
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.Case("arg1", LLDB_REGNUM_GENERIC_ARG1)
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.Case("arg2", LLDB_REGNUM_GENERIC_ARG2)
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.Case("arg3", LLDB_REGNUM_GENERIC_ARG3)
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.Case("arg4", LLDB_REGNUM_GENERIC_ARG4)
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.Case("arg5", LLDB_REGNUM_GENERIC_ARG5)
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.Case("arg6", LLDB_REGNUM_GENERIC_ARG6)
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.Case("arg7", LLDB_REGNUM_GENERIC_ARG7)
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.Case("arg8", LLDB_REGNUM_GENERIC_ARG8)
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.Default(LLDB_INVALID_REGNUM);
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return result;
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}
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void Args::EncodeEscapeSequences(const char *src, std::string &dst) {
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dst.clear();
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if (src) {
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for (const char *p = src; *p != '\0'; ++p) {
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size_t non_special_chars = ::strcspn(p, "\\");
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if (non_special_chars > 0) {
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dst.append(p, non_special_chars);
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p += non_special_chars;
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if (*p == '\0')
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break;
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}
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if (*p == '\\') {
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++p; // skip the slash
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switch (*p) {
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case 'a':
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dst.append(1, '\a');
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break;
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case 'b':
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dst.append(1, '\b');
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break;
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case 'f':
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dst.append(1, '\f');
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break;
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case 'n':
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dst.append(1, '\n');
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break;
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case 'r':
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dst.append(1, '\r');
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break;
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case 't':
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dst.append(1, '\t');
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break;
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case 'v':
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dst.append(1, '\v');
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break;
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case '\\':
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dst.append(1, '\\');
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break;
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case '\'':
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dst.append(1, '\'');
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break;
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case '"':
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dst.append(1, '"');
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break;
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case '0':
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// 1 to 3 octal chars
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{
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// Make a string that can hold onto the initial zero char, up to 3
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// octal digits, and a terminating NULL.
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char oct_str[5] = {'\0', '\0', '\0', '\0', '\0'};
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int i;
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for (i = 0; (p[i] >= '0' && p[i] <= '7') && i < 4; ++i)
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oct_str[i] = p[i];
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// We don't want to consume the last octal character since the main
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// for loop will do this for us, so we advance p by one less than i
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// (even if i is zero)
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p += i - 1;
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unsigned long octal_value = ::strtoul(oct_str, nullptr, 8);
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if (octal_value <= UINT8_MAX) {
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dst.append(1, static_cast<char>(octal_value));
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}
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}
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break;
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case 'x':
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// hex number in the format
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if (isxdigit(p[1])) {
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++p; // Skip the 'x'
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// Make a string that can hold onto two hex chars plus a
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// NULL terminator
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char hex_str[3] = {*p, '\0', '\0'};
|
|
if (isxdigit(p[1])) {
|
|
++p; // Skip the first of the two hex chars
|
|
hex_str[1] = *p;
|
|
}
|
|
|
|
unsigned long hex_value = strtoul(hex_str, nullptr, 16);
|
|
if (hex_value <= UINT8_MAX)
|
|
dst.append(1, static_cast<char>(hex_value));
|
|
} else {
|
|
dst.append(1, 'x');
|
|
}
|
|
break;
|
|
|
|
default:
|
|
// Just desensitize any other character by just printing what came
|
|
// after the '\'
|
|
dst.append(1, *p);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Args::ExpandEscapedCharacters(const char *src, std::string &dst) {
|
|
dst.clear();
|
|
if (src) {
|
|
for (const char *p = src; *p != '\0'; ++p) {
|
|
if (isprint(*p))
|
|
dst.append(1, *p);
|
|
else {
|
|
switch (*p) {
|
|
case '\a':
|
|
dst.append("\\a");
|
|
break;
|
|
case '\b':
|
|
dst.append("\\b");
|
|
break;
|
|
case '\f':
|
|
dst.append("\\f");
|
|
break;
|
|
case '\n':
|
|
dst.append("\\n");
|
|
break;
|
|
case '\r':
|
|
dst.append("\\r");
|
|
break;
|
|
case '\t':
|
|
dst.append("\\t");
|
|
break;
|
|
case '\v':
|
|
dst.append("\\v");
|
|
break;
|
|
case '\'':
|
|
dst.append("\\'");
|
|
break;
|
|
case '"':
|
|
dst.append("\\\"");
|
|
break;
|
|
case '\\':
|
|
dst.append("\\\\");
|
|
break;
|
|
default: {
|
|
// Just encode as octal
|
|
dst.append("\\0");
|
|
char octal_str[32];
|
|
snprintf(octal_str, sizeof(octal_str), "%o", *p);
|
|
dst.append(octal_str);
|
|
} break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string Args::EscapeLLDBCommandArgument(const std::string &arg,
|
|
char quote_char) {
|
|
const char *chars_to_escape = nullptr;
|
|
switch (quote_char) {
|
|
case '\0':
|
|
chars_to_escape = " \t\\'\"`";
|
|
break;
|
|
case '"':
|
|
chars_to_escape = "$\"`\\";
|
|
break;
|
|
case '`':
|
|
case '\'':
|
|
return arg;
|
|
default:
|
|
assert(false && "Unhandled quote character");
|
|
return arg;
|
|
}
|
|
|
|
std::string res;
|
|
res.reserve(arg.size());
|
|
for (char c : arg) {
|
|
if (::strchr(chars_to_escape, c))
|
|
res.push_back('\\');
|
|
res.push_back(c);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
OptionsWithRaw::OptionsWithRaw(llvm::StringRef arg_string) {
|
|
SetFromString(arg_string);
|
|
}
|
|
|
|
void OptionsWithRaw::SetFromString(llvm::StringRef arg_string) {
|
|
const llvm::StringRef original_args = arg_string;
|
|
|
|
arg_string = ltrimForArgs(arg_string);
|
|
std::string arg;
|
|
char quote;
|
|
|
|
// If the string doesn't start with a dash, we just have no options and just
|
|
// a raw part.
|
|
if (!arg_string.startswith("-")) {
|
|
m_suffix = original_args;
|
|
return;
|
|
}
|
|
|
|
bool found_suffix = false;
|
|
|
|
while (!arg_string.empty()) {
|
|
// The length of the prefix before parsing.
|
|
std::size_t prev_prefix_length = original_args.size() - arg_string.size();
|
|
|
|
// Parse the next argument from the remaining string.
|
|
std::tie(arg, quote, arg_string) = ParseSingleArgument(arg_string);
|
|
|
|
// If we get an unquoted '--' argument, then we reached the suffix part
|
|
// of the command.
|
|
Args::ArgEntry entry(arg, quote);
|
|
if (!entry.IsQuoted() && arg == "--") {
|
|
// The remaining line is the raw suffix, and the line we parsed so far
|
|
// needs to be interpreted as arguments.
|
|
m_has_args = true;
|
|
m_suffix = arg_string;
|
|
found_suffix = true;
|
|
|
|
// The length of the prefix after parsing.
|
|
std::size_t prefix_length = original_args.size() - arg_string.size();
|
|
|
|
// Take the string we know contains all the arguments and actually parse
|
|
// it as proper arguments.
|
|
llvm::StringRef prefix = original_args.take_front(prev_prefix_length);
|
|
m_args = Args(prefix);
|
|
m_arg_string = prefix;
|
|
|
|
// We also record the part of the string that contains the arguments plus
|
|
// the delimiter.
|
|
m_arg_string_with_delimiter = original_args.take_front(prefix_length);
|
|
|
|
// As the rest of the string became the raw suffix, we are done here.
|
|
break;
|
|
}
|
|
|
|
arg_string = ltrimForArgs(arg_string);
|
|
}
|
|
|
|
// If we didn't find a suffix delimiter, the whole string is the raw suffix.
|
|
if (!found_suffix) {
|
|
found_suffix = true;
|
|
m_suffix = original_args;
|
|
}
|
|
}
|