163 lines
4.2 KiB
C
163 lines
4.2 KiB
C
/* More debugging hooks for `mmalloc'.
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Copyright 1991, 1992 Free Software Foundation
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Written April 2, 1991 by John Gilmore of Cygnus Support
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Based on mcheck.c by Mike Haertel.
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Modified Mar 1992 by Fred Fish. (fnf@cygnus.com)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "mmalloc.h"
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#ifndef __GNU_LIBRARY__
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extern char *getenv ();
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#endif
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static FILE *mallstream;
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#if 0 /* FIXME: Disabled for now. */
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static char mallenv[] = "MALLOC_TRACE";
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static char mallbuf[BUFSIZ]; /* Buffer for the output. */
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#endif
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/* Address to breakpoint on accesses to... */
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static PTR mallwatch;
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/* Old hook values. */
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static void (*old_mfree_hook) PARAMS ((PTR, PTR));
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static PTR (*old_mmalloc_hook) PARAMS ((PTR, size_t));
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static PTR (*old_mrealloc_hook) PARAMS ((PTR, PTR, size_t));
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/* This function is called when the block being alloc'd, realloc'd, or
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freed has an address matching the variable "mallwatch". In a debugger,
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set "mallwatch" to the address of interest, then put a breakpoint on
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tr_break. */
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static void
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tr_break ()
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{
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}
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static void
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tr_freehook (md, ptr)
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PTR md;
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PTR ptr;
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{
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struct mdesc *mdp;
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mdp = MD_TO_MDP (md);
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/* Be sure to print it first. */
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(void) fprintf (mallstream, "- %08x\n", (unsigned int) ptr);
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if (ptr == mallwatch)
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tr_break ();
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mdp -> mfree_hook = old_mfree_hook;
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mfree (md, ptr);
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mdp -> mfree_hook = tr_freehook;
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}
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static PTR
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tr_mallochook (md, size)
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PTR md;
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size_t size;
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{
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PTR hdr;
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struct mdesc *mdp;
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mdp = MD_TO_MDP (md);
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mdp -> mmalloc_hook = old_mmalloc_hook;
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hdr = (PTR) mmalloc (md, size);
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mdp -> mmalloc_hook = tr_mallochook;
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/* We could be printing a NULL here; that's OK. */
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(void) fprintf (mallstream, "+ %08x %x\n", (unsigned int) hdr, size);
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if (hdr == mallwatch)
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tr_break ();
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return (hdr);
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}
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static PTR
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tr_reallochook (md, ptr, size)
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PTR md;
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PTR ptr;
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size_t size;
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{
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PTR hdr;
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struct mdesc *mdp;
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mdp = MD_TO_MDP (md);
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if (ptr == mallwatch)
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tr_break ();
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mdp -> mfree_hook = old_mfree_hook;
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mdp -> mmalloc_hook = old_mmalloc_hook;
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mdp -> mrealloc_hook = old_mrealloc_hook;
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hdr = (PTR) mrealloc (md, ptr, size);
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mdp -> mfree_hook = tr_freehook;
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mdp -> mmalloc_hook = tr_mallochook;
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mdp -> mrealloc_hook = tr_reallochook;
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if (hdr == NULL)
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/* Failed realloc. */
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(void) fprintf (mallstream, "! %08x %x\n", (unsigned int) ptr, size);
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else
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(void) fprintf (mallstream, "< %08x\n> %08x %x\n", (unsigned int) ptr,
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(unsigned int) hdr, size);
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if (hdr == mallwatch)
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tr_break ();
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return hdr;
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}
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/* We enable tracing if either the environment variable MALLOC_TRACE
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is set, or if the variable mallwatch has been patched to an address
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that the debugging user wants us to stop on. When patching mallwatch,
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don't forget to set a breakpoint on tr_break! */
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int
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mmtrace ()
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{
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#if 0 /* FIXME! This is disabled for now until we figure out how to
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maintain a stack of hooks per heap, since we might have other
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hooks (such as set by mmcheck) active also. */
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char *mallfile;
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mallfile = getenv (mallenv);
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if (mallfile != NULL || mallwatch != NULL)
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{
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mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "w");
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if (mallstream != NULL)
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{
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/* Be sure it doesn't mmalloc its buffer! */
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setbuf (mallstream, mallbuf);
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(void) fprintf (mallstream, "= Start\n");
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old_mfree_hook = mdp -> mfree_hook;
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mdp -> mfree_hook = tr_freehook;
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old_mmalloc_hook = mdp -> mmalloc_hook;
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mdp -> mmalloc_hook = tr_mallochook;
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old_mrealloc_hook = mdp -> mrealloc_hook;
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mdp -> mrealloc_hook = tr_reallochook;
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}
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}
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#endif /* 0 */
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return (1);
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}
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