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perl/deb.c

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/* deb.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
* 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'Didst thou think that the eyes of the White Tower were blind? Nay,
* I have seen more than thou knowest, Grey Fool.' --Denethor
*
* [p.853 of _The Lord of the Rings_, V/vii: "The Pyre of Denethor"]
*/
/*
* This file contains various utilities for producing debugging output
* (mainly related to displaying the stack)
*/
#include "EXTERN.h"
#define PERL_IN_DEB_C
#include "perl.h"
#if defined(PERL_IMPLICIT_CONTEXT)
void
Perl_deb_nocontext(const char *pat, ...)
{
#ifdef DEBUGGING
dTHX;
va_list args;
PERL_ARGS_ASSERT_DEB_NOCONTEXT;
va_start(args, pat);
vdeb(pat, &args);
va_end(args);
#else
PERL_UNUSED_ARG(pat);
#endif /* DEBUGGING */
}
#endif
void
Perl_deb(pTHX_ const char *pat, ...)
{
va_list args;
PERL_ARGS_ASSERT_DEB;
va_start(args, pat);
#ifdef DEBUGGING
vdeb(pat, &args);
#else
PERL_UNUSED_CONTEXT;
#endif /* DEBUGGING */
va_end(args);
}
void
Perl_vdeb(pTHX_ const char *pat, va_list *args)
{
#ifdef DEBUGGING
const char* const file = PL_curcop ? OutCopFILE(PL_curcop) : "<null>";
const char* const display_file = file ? file : "<free>";
const long line = PL_curcop ? (long)CopLINE(PL_curcop) : 0;
PERL_ARGS_ASSERT_VDEB;
if (DEBUG_v_TEST)
PerlIO_printf(Perl_debug_log, "(%ld:%s:%ld)\t",
(long)PerlProc_getpid(), display_file, line);
else
PerlIO_printf(Perl_debug_log, "(%s:%ld)\t", display_file, line);
(void) PerlIO_vprintf(Perl_debug_log, pat, *args);
#else
PERL_UNUSED_CONTEXT;
PERL_UNUSED_ARG(pat);
PERL_UNUSED_ARG(args);
#endif /* DEBUGGING */
}
I32
Perl_debstackptrs(pTHX)
{
#ifdef DEBUGGING
PerlIO_printf(Perl_debug_log,
"%8" UVxf " %8" UVxf " %8" IVdf " %8" IVdf " %8" IVdf "\n",
PTR2UV(PL_curstack), PTR2UV(PL_stack_base),
(IV)*PL_markstack_ptr, (IV)(PL_stack_sp-PL_stack_base),
(IV)(PL_stack_max-PL_stack_base));
PerlIO_printf(Perl_debug_log,
"%8" UVxf " %8" UVxf " %8" UVuf " %8" UVuf " %8" UVuf "\n",
PTR2UV(PL_mainstack), PTR2UV(AvARRAY(PL_curstack)),
PTR2UV(PL_mainstack), PTR2UV(AvFILLp(PL_curstack)),
PTR2UV(AvMAX(PL_curstack)));
#else
PERL_UNUSED_CONTEXT;
#endif /* DEBUGGING */
return 0;
}
/* dump the contents of a particular stack
* Display stack_base[stack_min+1 .. stack_max],
* and display the marks whose offsets are contained in addresses
* PL_markstack[mark_min+1 .. mark_max] and whose values are in the range
* of the stack values being displayed
*
* Only displays top 30 max
*/
STATIC void
S_deb_stack_n(pTHX_ SV** stack_base, I32 stack_min, I32 stack_max,
I32 mark_min, I32 mark_max)
{
#ifdef DEBUGGING
I32 i = stack_max - 30;
const I32 *markscan = PL_markstack + mark_min;
PERL_ARGS_ASSERT_DEB_STACK_N;
if (i < stack_min)
i = stack_min;
while (++markscan <= PL_markstack + mark_max)
if (*markscan >= i)
break;
if (i > stack_min)
PerlIO_printf(Perl_debug_log, "... ");
if (stack_base[0] != &PL_sv_undef || stack_max < 0)
PerlIO_printf(Perl_debug_log, " [STACK UNDERFLOW!!!]\n");
do {
++i;
if (markscan <= PL_markstack + mark_max && *markscan < i) {
do {
++markscan;
(void)PerlIO_putc(Perl_debug_log, '*');
}
while (markscan <= PL_markstack + mark_max && *markscan < i);
PerlIO_printf(Perl_debug_log, " ");
}
if (i > stack_max)
break;
PerlIO_printf(Perl_debug_log, "%-4s ", SvPEEK(stack_base[i]));
}
while (1);
PerlIO_printf(Perl_debug_log, "\n");
#else
PERL_UNUSED_CONTEXT;
PERL_UNUSED_ARG(stack_base);
PERL_UNUSED_ARG(stack_min);
PERL_UNUSED_ARG(stack_max);
PERL_UNUSED_ARG(mark_min);
PERL_UNUSED_ARG(mark_max);
#endif /* DEBUGGING */
}
/* dump the current stack */
I32
Perl_debstack(pTHX)
{
#ifndef SKIP_DEBUGGING
if (CopSTASH_eq(PL_curcop, PL_debstash) && !DEBUG_J_TEST_)
return 0;
PerlIO_printf(Perl_debug_log, " => ");
deb_stack_n(PL_stack_base,
0,
PL_stack_sp - PL_stack_base,
PL_curstackinfo->si_markoff,
PL_markstack_ptr - PL_markstack);
#endif /* SKIP_DEBUGGING */
return 0;
}
#ifdef DEBUGGING
static const char * const si_names[] = {
"UNKNOWN",
"UNDEF",
"MAIN",
"MAGIC",
"SORT",
"SIGNAL",
"OVERLOAD",
"DESTROY",
"WARNHOOK",
"DIEHOOK",
"REQUIRE",
"MULTICALL"
};
#endif
/* display all stacks */
void
Perl_deb_stack_all(pTHX)
{
#ifdef DEBUGGING
I32 si_ix;
const PERL_SI *si;
/* rewind to start of chain */
si = PL_curstackinfo;
while (si->si_prev)
si = si->si_prev;
si_ix=0;
for (;;)
{
const size_t si_name_ix = si->si_type+1; /* -1 is a valid index */
const char * const si_name =
si_name_ix < C_ARRAY_LENGTH(si_names) ?
si_names[si_name_ix] : "????";
I32 ix;
PerlIO_printf(Perl_debug_log, "STACK %" IVdf ": %s\n",
(IV)si_ix, si_name);
for (ix=0; ix<=si->si_cxix; ix++) {
const PERL_CONTEXT * const cx = &(si->si_cxstack[ix]);
PerlIO_printf(Perl_debug_log,
" CX %" IVdf ": %-6s => ",
(IV)ix, PL_block_type[CxTYPE(cx)]
);
/* substitution contexts don't save stack pointers etc) */
if (CxTYPE(cx) == CXt_SUBST)
PerlIO_printf(Perl_debug_log, "\n");
else {
/* Find the current context's stack range by searching
* forward for any higher contexts using this stack; failing
* that, it will be equal to the size of the stack for old
* stacks, or PL_stack_sp for the current stack
*/
I32 i, stack_min, stack_max, mark_min, mark_max;
const PERL_CONTEXT *cx_n = NULL;
const PERL_SI *si_n;
/* there's a separate argument stack per SI, so only
* search this one */
for (i=ix+1; i<=si->si_cxix; i++) {
const PERL_CONTEXT *this_cx = &(si->si_cxstack[i]);
if (CxTYPE(this_cx) == CXt_SUBST)
continue;
cx_n = this_cx;
break;
}
stack_min = cx->blk_oldsp;
if (cx_n) {
stack_max = cx_n->blk_oldsp;
}
else if (si == PL_curstackinfo) {
stack_max = PL_stack_sp - AvARRAY(si->si_stack);
}
else {
stack_max = AvFILLp(si->si_stack);
}
/* for the markstack, there's only one stack shared
* between all SIs */
si_n = si;
i = ix;
cx_n = NULL;
for (;;) {
i++;
if (i > si_n->si_cxix) {
if (si_n == PL_curstackinfo)
break;
else {
si_n = si_n->si_next;
i = 0;
}
}
if (CxTYPE(&(si_n->si_cxstack[i])) == CXt_SUBST)
continue;
cx_n = &(si_n->si_cxstack[i]);
break;
}
mark_min = cx->blk_oldmarksp;
if (cx_n) {
mark_max = cx_n->blk_oldmarksp;
}
else {
mark_max = PL_markstack_ptr - PL_markstack;
}
deb_stack_n(AvARRAY(si->si_stack),
stack_min, stack_max, mark_min, mark_max);
if (CxTYPE(cx) == CXt_EVAL || CxTYPE(cx) == CXt_SUB
|| CxTYPE(cx) == CXt_FORMAT)
{
const OP * const retop = cx->blk_sub.retop;
PerlIO_printf(Perl_debug_log, " retop=%s\n",
retop ? OP_NAME(retop) : "(null)"
);
}
}
} /* next context */
if (si == PL_curstackinfo)
break;
si = si->si_next;
si_ix++;
if (!si)
break; /* shouldn't happen, but just in case.. */
} /* next stackinfo */
PerlIO_printf(Perl_debug_log, "\n");
#else
PERL_UNUSED_CONTEXT;
#endif /* DEBUGGING */
}
/*
* ex: set ts=8 sts=4 sw=4 et:
*/
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