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/*
* libc/stdlib/malloc/heap_debug.c -- optional heap debugging routines
*
* Copyright (C) 2002 NEC Corporation
* Copyright (C) 2002 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
/* libc_hidden_proto(vfprintf) */
/* libc_hidden_proto(fprintf) */
/* libc_hidden_proto(_exit) */
#include "malloc.h"
#include "heap.h"
#ifdef HEAP_DEBUGGING
int __heap_debug = 0;
#endif
static void
__heap_dump_freelist (struct heap_free_area *heap)
{
struct heap_free_area *fa;
for (fa = heap; fa; fa = fa->next)
__malloc_debug_printf (0,
"0x%lx: 0x%lx - 0x%lx (%d)\tP=0x%lx, N=0x%lx",
(long)fa,
(long)HEAP_FREE_AREA_START (fa),
(long)HEAP_FREE_AREA_END (fa),
fa->size,
(long)fa->prev,
(long)fa->next);
}
/* Output a text representation of HEAP to stderr, labelling it with STR. */
void
__heap_dump (struct heap_free_area *heap, const char *str)
{
static smallint recursed;
if (! recursed)
{
__heap_check (heap, str);
recursed = 1;
__malloc_debug_printf (1, "%s: heap @0x%lx:", str, (long)heap);
__heap_dump_freelist (heap);
__malloc_debug_indent (-1);
recursed = 0;
}
}
/* Output an error message to stderr, and exit. STR is printed with the
failure message. */
static void attribute_noreturn
__heap_check_failure (struct heap_free_area *heap, struct heap_free_area *fa,
const char *str, char *fmt, ...)
{
va_list val;
if (str)
fprintf (stderr, "\nHEAP CHECK FAILURE %s: ", str);
else
fprintf (stderr, "\nHEAP CHECK FAILURE: ");
va_start (val, fmt);
vfprintf (stderr, fmt, val);
va_end (val);
fprintf (stderr, "\n");
__malloc_debug_set_indent (0);
__malloc_debug_printf (1, "heap dump:");
__heap_dump_freelist (heap);
_exit (22);
}
/* Do some consistency checks on HEAP. If they fail, output an error
message to stderr, and exit. STR is printed with the failure message. */
void
__heap_check (struct heap_free_area *heap, const char *str)
{
typedef unsigned long ul_t;
struct heap_free_area *fa, *prev;
struct heap_free_area *first_fa = heap;
if (first_fa && first_fa->prev)
__heap_check_failure (heap, first_fa, str,
"first free-area has non-zero prev pointer:\n\
first free-area = 0x%lx\n\
(0x%lx)->prev = 0x%lx\n",
(ul_t)first_fa,
(ul_t)first_fa, (ul_t)first_fa->prev);
for (prev = 0, fa = first_fa; fa; prev = fa, fa = fa->next)
{
if (((ul_t)HEAP_FREE_AREA_END (fa) & (HEAP_GRANULARITY - 1))
|| (fa->size & (HEAP_GRANULARITY - 1)))
__heap_check_failure (heap, fa, str, "alignment error:\n\
(0x%lx)->start = 0x%lx\n\
(0x%lx)->size = 0x%lx\n",
(ul_t)fa,
(ul_t)HEAP_FREE_AREA_START (fa),
(ul_t)fa, fa->size);
if (fa->prev != prev)
__heap_check_failure (heap, fa, str, "prev pointer corrupted:\n\
(0x%lx)->next = 0x%lx\n\
(0x%lx)->prev = 0x%lx\n",
(ul_t)prev, (ul_t)prev->next,
(ul_t)fa, (ul_t)fa->prev);
if (prev)
{
ul_t start = (ul_t)HEAP_FREE_AREA_START (fa);
ul_t prev_end = (ul_t)HEAP_FREE_AREA_END (prev);
if (prev_end >= start)
__heap_check_failure (heap, fa, str,
"start %s with prev free-area end:\n\
(0x%lx)->prev = 0x%lx\n\
(0x%lx)->start = 0x%lx\n\
(0x%lx)->end = 0x%lx\n",
(prev_end == start ? "unmerged" : "overlaps"),
(ul_t)fa, (ul_t)prev,
(ul_t)fa, start,
(ul_t)prev, prev_end);
}
}
}
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