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/* More debugging hooks for `malloc'.
Copyright 1991 Free Software Foundation
Written April 2, 1991 by John Gilmore of Cygnus Support
Based on mcheck.c by Mike Haertel.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include "ansidecl.h"
/* size_t may be defined in the system-supplied stdio.h. */
/* So just kludge it. */
#define size_t unsigned int
#define ptrdiff_t int
#define __ONEFILE
/* We can't declare malloc and realloc here because we don't know
if they are char * or void *, and the compiler will give an error
if we get it wrong and they happen to be defined in some header
file e.g. <stdio.h>. We can't include <stdlib.h> here because
it has some incompatability with our own includes, e.g. size_t or
whatever. So we just punt. This causes malloc and realloc to
default to returning "int", which works for most cases we care
about. FIXME-somehow. */
/* #include <stdlib.h> */
#include "gmalloc.h"
extern char *getenv();
FILE *mallstream;
char mallenv[] = "MALLOC_TRACE";
static char mallbuf[BUFSIZ]; /* Buffer for the output */
/* Address to breakpoint on accesses to... */
PTR mallwatch;
/* Old hook values. */
static void EXFUN((*old_free_hook), (PTR ptr));
static PTR EXFUN((*old_malloc_hook), (size_t size));
static PTR EXFUN((*old_realloc_hook), (PTR ptr, size_t size));
/* This function is called when the block being alloc'd, realloc'd, or
freed has an address matching the variable "mallwatch". In a debugger,
set "mallwatch" to the address of interest, then put a breakpoint on
tr_break. */
void
tr_break()
{
;
}
static void
DEFUN(tr_freehook, (ptr), PTR ptr)
{
fprintf(mallstream, "- %08x\n", ptr); /* Be sure to print it first */
if (ptr == mallwatch)
tr_break();
__free_hook = old_free_hook;
free(ptr);
__free_hook = tr_freehook;
}
static PTR
DEFUN(tr_mallochook, (size), size_t size)
{
PTR hdr;
__malloc_hook = old_malloc_hook;
hdr = (PTR) malloc(size);
__malloc_hook = tr_mallochook;
/* We could be printing a NULL here; that's OK */
fprintf (mallstream, "+ %08x %x\n", hdr, size);
if (hdr == mallwatch)
tr_break();
return hdr;
}
static PTR
DEFUN(tr_reallochook, (ptr, size), PTR ptr AND size_t size)
{
PTR hdr;
if (ptr == mallwatch)
tr_break();
__free_hook = old_free_hook;
__malloc_hook = old_malloc_hook;
__realloc_hook = old_realloc_hook;
hdr = (PTR) realloc(ptr, size);
__free_hook = tr_freehook;
__malloc_hook = tr_mallochook;
__realloc_hook = tr_reallochook;
if (hdr == NULL) {
fprintf (mallstream, "! %08x %x\n", ptr, size); /* Failed realloc */
} else {
fprintf (mallstream, "< %08x\n> %08x %x\n", ptr, hdr, size);
}
if (hdr == mallwatch)
tr_break();
return hdr;
}
/* We enable tracing if either the environment variable MALLOC_TRACE
is set, or if the variable mallwatch has been patched to an address
that the debugging user wants us to stop on. When patching mallwatch,
don't forget to set a breakpoint on tr_break! */
void
mtrace()
{
char *mallfile;
mallfile = getenv (mallenv);
if (mallfile || mallwatch) {
mallstream = fopen (mallfile? mallfile: "/dev/null", "w");
if (mallstream) {
/* Be sure it doesn't malloc its buffer! */
setbuf (mallstream, mallbuf);
fprintf (mallstream, "= Start\n");
old_free_hook = __free_hook;
__free_hook = tr_freehook;
old_malloc_hook = __malloc_hook;
__malloc_hook = tr_mallochook;
old_realloc_hook = __realloc_hook;
__realloc_hook = tr_reallochook;
}
}
}
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