143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/* TMP_ALLOC routines for debugging.
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Copyright 2000, 2001, 2004 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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/* This method aims to help a malloc debugger find problems. A linked list
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of allocated block is kept for TMP_FREE to release. This is reentrant
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and thread safe.
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Each TMP_ALLOC is a separate malloced block, so redzones or sentinels
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applied by a malloc debugger either above or below can guard against
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accesses outside the allocated area.
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A marker is a "struct tmp_debug_t *" so that TMP_DECL can initialize it
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to NULL and we can detect TMP_ALLOC without TMP_MARK.
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It will work to realloc an MPZ_TMP_INIT variable, but when TMP_FREE comes
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to release the memory it will have the old size, thereby triggering an
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error from tests/memory.c.
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Possibilities:
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It'd be possible to keep a global list of active "struct tmp_debug_t"
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records, so at the end of a program any TMP leaks could be printed. But
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if only a couple of routines are under test at any one time then the
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likely culprit should be easy enough to spot. */
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void
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__gmp_tmp_debug_mark (const char *file, int line,
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struct tmp_debug_t **markp, struct tmp_debug_t *mark,
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const char *decl_name, const char *mark_name)
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{
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if (strcmp (mark_name, decl_name) != 0)
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{
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__gmp_assert_header (file, line);
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fprintf (stderr, "GNU MP: TMP_MARK(%s) but TMP_DECL(%s) is in scope\n",
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mark_name, decl_name);
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abort ();
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}
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if (*markp != NULL)
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{
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__gmp_assert_header (file, line);
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fprintf (stderr, "GNU MP: Repeat of TMP_MARK(%s)\n", mark_name);
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if (mark->file != NULL && mark->file[0] != '\0' && mark->line != -1)
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{
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__gmp_assert_header (mark->file, mark->line);
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fprintf (stderr, "previous was here\n");
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}
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abort ();
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}
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*markp = mark;
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mark->file = file;
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mark->line = line;
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mark->list = NULL;
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}
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void *
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__gmp_tmp_debug_alloc (const char *file, int line, int dummy,
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struct tmp_debug_t **markp,
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const char *decl_name, size_t size)
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{
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struct tmp_debug_t *mark = *markp;
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struct tmp_debug_entry_t *p;
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ASSERT_ALWAYS (size >= 1);
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if (mark == NULL)
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{
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__gmp_assert_header (file, line);
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fprintf (stderr, "GNU MP: TMP_ALLOC without TMP_MARK(%s)\n", decl_name);
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abort ();
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}
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p = __GMP_ALLOCATE_FUNC_TYPE (1, struct tmp_debug_entry_t);
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p->size = size;
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p->block = (*__gmp_allocate_func) (size);
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p->next = mark->list;
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mark->list = p;
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return p->block;
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}
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void
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__gmp_tmp_debug_free (const char *file, int line, int dummy,
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struct tmp_debug_t **markp,
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const char *decl_name, const char *free_name)
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{
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struct tmp_debug_t *mark = *markp;
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struct tmp_debug_entry_t *p, *next;
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if (mark == NULL)
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{
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__gmp_assert_header (file, line);
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fprintf (stderr, "GNU MP: TMP_FREE(%s) without TMP_MARK(%s)\n",
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free_name, decl_name);
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abort ();
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}
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if (strcmp (free_name, decl_name) != 0)
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{
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__gmp_assert_header (file, line);
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fprintf (stderr, "GNU MP: TMP_FREE(%s) when TMP_DECL(%s) is in scope\n",
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free_name, decl_name);
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abort ();
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}
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p = mark->list;
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while (p != NULL)
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{
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next = p->next;
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(*__gmp_free_func) (p->block, p->size);
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__GMP_FREE_FUNC_TYPE (p, 1, struct tmp_debug_entry_t);
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p = next;
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}
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*markp = NULL;
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}
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