164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/* More debugging hooks for `mmalloc'.
|
|
Copyright 1991, 1992 Free Software Foundation
|
|
|
|
Written April 2, 1991 by John Gilmore of Cygnus Support
|
|
Based on mcheck.c by Mike Haertel.
|
|
Modified Mar 1992 by Fred Fish. (fnf@cygnus.com)
|
|
|
|
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 "mmalloc.h"
|
|
|
|
#ifndef __GNU_LIBRARY__
|
|
extern char *getenv ();
|
|
#endif
|
|
|
|
static FILE *mallstream;
|
|
|
|
#if 0 /* FIXME: Disabled for now. */
|
|
static char mallenv[] = "MALLOC_TRACE";
|
|
static char mallbuf[BUFSIZ]; /* Buffer for the output. */
|
|
#endif
|
|
|
|
/* Address to breakpoint on accesses to... */
|
|
static PTR mallwatch;
|
|
|
|
/* Old hook values. */
|
|
|
|
static void (*old_mfree_hook) PARAMS ((PTR, PTR));
|
|
static PTR (*old_mmalloc_hook) PARAMS ((PTR, size_t));
|
|
static PTR (*old_mrealloc_hook) PARAMS ((PTR, PTR, size_t));
|
|
|
|
/* 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. */
|
|
|
|
static void
|
|
tr_break ()
|
|
{
|
|
}
|
|
|
|
static void
|
|
tr_freehook (md, ptr)
|
|
PTR md;
|
|
PTR ptr;
|
|
{
|
|
struct mdesc *mdp;
|
|
|
|
mdp = MD_TO_MDP (md);
|
|
/* Be sure to print it first. */
|
|
(void) fprintf (mallstream, "- %08x\n", (unsigned int) ptr);
|
|
if (ptr == mallwatch)
|
|
tr_break ();
|
|
mdp -> mfree_hook = old_mfree_hook;
|
|
mfree (md, ptr);
|
|
mdp -> mfree_hook = tr_freehook;
|
|
}
|
|
|
|
static PTR
|
|
tr_mallochook (md, size)
|
|
PTR md;
|
|
size_t size;
|
|
{
|
|
PTR hdr;
|
|
struct mdesc *mdp;
|
|
|
|
mdp = MD_TO_MDP (md);
|
|
mdp -> mmalloc_hook = old_mmalloc_hook;
|
|
hdr = (PTR) mmalloc (md, size);
|
|
mdp -> mmalloc_hook = tr_mallochook;
|
|
|
|
/* We could be printing a NULL here; that's OK. */
|
|
(void) fprintf (mallstream, "+ %08x %x\n", (unsigned int) hdr, size);
|
|
|
|
if (hdr == mallwatch)
|
|
tr_break ();
|
|
|
|
return (hdr);
|
|
}
|
|
|
|
static PTR
|
|
tr_reallochook (md, ptr, size)
|
|
PTR md;
|
|
PTR ptr;
|
|
size_t size;
|
|
{
|
|
PTR hdr;
|
|
struct mdesc *mdp;
|
|
|
|
mdp = MD_TO_MDP (md);
|
|
|
|
if (ptr == mallwatch)
|
|
tr_break ();
|
|
|
|
mdp -> mfree_hook = old_mfree_hook;
|
|
mdp -> mmalloc_hook = old_mmalloc_hook;
|
|
mdp -> mrealloc_hook = old_mrealloc_hook;
|
|
hdr = (PTR) mrealloc (md, ptr, size);
|
|
mdp -> mfree_hook = tr_freehook;
|
|
mdp -> mmalloc_hook = tr_mallochook;
|
|
mdp -> mrealloc_hook = tr_reallochook;
|
|
if (hdr == NULL)
|
|
/* Failed realloc. */
|
|
(void) fprintf (mallstream, "! %08x %x\n", (unsigned int) ptr, size);
|
|
else
|
|
(void) fprintf (mallstream, "< %08x\n> %08x %x\n", (unsigned int) ptr,
|
|
(unsigned int) 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! */
|
|
|
|
int
|
|
mmtrace ()
|
|
{
|
|
#if 0 /* FIXME! This is disabled for now until we figure out how to
|
|
maintain a stack of hooks per heap, since we might have other
|
|
hooks (such as set by mmcheck) active also. */
|
|
char *mallfile;
|
|
|
|
mallfile = getenv (mallenv);
|
|
if (mallfile != NULL || mallwatch != NULL)
|
|
{
|
|
mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "w");
|
|
if (mallstream != NULL)
|
|
{
|
|
/* Be sure it doesn't mmalloc its buffer! */
|
|
setbuf (mallstream, mallbuf);
|
|
(void) fprintf (mallstream, "= Start\n");
|
|
old_mfree_hook = mdp -> mfree_hook;
|
|
mdp -> mfree_hook = tr_freehook;
|
|
old_mmalloc_hook = mdp -> mmalloc_hook;
|
|
mdp -> mmalloc_hook = tr_mallochook;
|
|
old_mrealloc_hook = mdp -> mrealloc_hook;
|
|
mdp -> mrealloc_hook = tr_reallochook;
|
|
}
|
|
}
|
|
|
|
#endif /* 0 */
|
|
|
|
return (1);
|
|
}
|
|
|