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/* TMP_ALLOC routines for debugging.
Copyright 2000, 2001, 2004 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gmp.h"
#include "gmp-impl.h"
/* This method aims to help a malloc debugger find problems. A linked list
of allocated block is kept for TMP_FREE to release. This is reentrant
and thread safe.
Each TMP_ALLOC is a separate malloced block, so redzones or sentinels
applied by a malloc debugger either above or below can guard against
accesses outside the allocated area.
A marker is a "struct tmp_debug_t *" so that TMP_DECL can initialize it
to NULL and we can detect TMP_ALLOC without TMP_MARK.
It will work to realloc an MPZ_TMP_INIT variable, but when TMP_FREE comes
to release the memory it will have the old size, thereby triggering an
error from tests/memory.c.
Possibilities:
It'd be possible to keep a global list of active "struct tmp_debug_t"
records, so at the end of a program any TMP leaks could be printed. But
if only a couple of routines are under test at any one time then the
likely culprit should be easy enough to spot. */
void
__gmp_tmp_debug_mark (const char *file, int line,
struct tmp_debug_t **markp, struct tmp_debug_t *mark,
const char *decl_name, const char *mark_name)
{
if (strcmp (mark_name, decl_name) != 0)
{
__gmp_assert_header (file, line);
fprintf (stderr, "GNU MP: TMP_MARK(%s) but TMP_DECL(%s) is in scope\n",
mark_name, decl_name);
abort ();
}
if (*markp != NULL)
{
__gmp_assert_header (file, line);
fprintf (stderr, "GNU MP: Repeat of TMP_MARK(%s)\n", mark_name);
if (mark->file != NULL && mark->file[0] != '\0' && mark->line != -1)
{
__gmp_assert_header (mark->file, mark->line);
fprintf (stderr, "previous was here\n");
}
abort ();
}
*markp = mark;
mark->file = file;
mark->line = line;
mark->list = NULL;
}
void *
__gmp_tmp_debug_alloc (const char *file, int line, int dummy,
struct tmp_debug_t **markp,
const char *decl_name, size_t size)
{
struct tmp_debug_t *mark = *markp;
struct tmp_debug_entry_t *p;
ASSERT_ALWAYS (size >= 1);
if (mark == NULL)
{
__gmp_assert_header (file, line);
fprintf (stderr, "GNU MP: TMP_ALLOC without TMP_MARK(%s)\n", decl_name);
abort ();
}
p = __GMP_ALLOCATE_FUNC_TYPE (1, struct tmp_debug_entry_t);
p->size = size;
p->block = (*__gmp_allocate_func) (size);
p->next = mark->list;
mark->list = p;
return p->block;
}
void
__gmp_tmp_debug_free (const char *file, int line, int dummy,
struct tmp_debug_t **markp,
const char *decl_name, const char *free_name)
{
struct tmp_debug_t *mark = *markp;
struct tmp_debug_entry_t *p, *next;
if (mark == NULL)
{
__gmp_assert_header (file, line);
fprintf (stderr, "GNU MP: TMP_FREE(%s) without TMP_MARK(%s)\n",
free_name, decl_name);
abort ();
}
if (strcmp (free_name, decl_name) != 0)
{
__gmp_assert_header (file, line);
fprintf (stderr, "GNU MP: TMP_FREE(%s) when TMP_DECL(%s) is in scope\n",
free_name, decl_name);
abort ();
}
p = mark->list;
while (p != NULL)
{
next = p->next;
(*__gmp_free_func) (p->block, p->size);
__GMP_FREE_FUNC_TYPE (p, 1, struct tmp_debug_entry_t);
p = next;
}
*markp = NULL;
}
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