147 lines
4.1 KiB
C
Executable File
147 lines
4.1 KiB
C
Executable File
/* More debugging hooks for `malloc'.
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Copyright 1991 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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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 "ansidecl.h"
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/* size_t may be defined in the system-supplied stdio.h. */
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/* So just kludge it. */
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#define size_t unsigned int
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#define ptrdiff_t int
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#define __ONEFILE
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/* We can't declare malloc and realloc here because we don't know
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if they are char * or void *, and the compiler will give an error
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if we get it wrong and they happen to be defined in some header
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file e.g. <stdio.h>. We can't include <stdlib.h> here because
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it has some incompatability with our own includes, e.g. size_t or
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whatever. So we just punt. This causes malloc and realloc to
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default to returning "int", which works for most cases we care
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about. FIXME-somehow. */
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/* #include <stdlib.h> */
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#include "gmalloc.h"
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extern char *getenv();
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FILE *mallstream;
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char mallenv[] = "MALLOC_TRACE";
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static char mallbuf[BUFSIZ]; /* Buffer for the output */
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/* Address to breakpoint on accesses to... */
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PTR mallwatch;
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/* Old hook values. */
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static void EXFUN((*old_free_hook), (PTR ptr));
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static PTR EXFUN((*old_malloc_hook), (size_t size));
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static PTR EXFUN((*old_realloc_hook), (PTR ptr, size_t size));
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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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void
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tr_break()
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{
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;
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}
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static void
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DEFUN(tr_freehook, (ptr), PTR ptr)
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{
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fprintf(mallstream, "- %08x\n", ptr); /* Be sure to print it first */
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if (ptr == mallwatch)
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tr_break();
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__free_hook = old_free_hook;
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free(ptr);
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__free_hook = tr_freehook;
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}
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static PTR
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DEFUN(tr_mallochook, (size), size_t size)
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{
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PTR hdr;
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__malloc_hook = old_malloc_hook;
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hdr = (PTR) malloc(size);
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__malloc_hook = tr_mallochook;
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/* We could be printing a NULL here; that's OK */
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fprintf (mallstream, "+ %08x %x\n", 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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DEFUN(tr_reallochook, (ptr, size), PTR ptr AND size_t size)
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{
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PTR hdr;
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if (ptr == mallwatch)
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tr_break();
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__free_hook = old_free_hook;
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__malloc_hook = old_malloc_hook;
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__realloc_hook = old_realloc_hook;
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hdr = (PTR) realloc(ptr, size);
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__free_hook = tr_freehook;
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__malloc_hook = tr_mallochook;
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__realloc_hook = tr_reallochook;
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if (hdr == NULL) {
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fprintf (mallstream, "! %08x %x\n", ptr, size); /* Failed realloc */
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} else {
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fprintf (mallstream, "< %08x\n> %08x %x\n", ptr, hdr, size);
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}
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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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void
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mtrace()
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{
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char *mallfile;
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mallfile = getenv (mallenv);
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if (mallfile || mallwatch) {
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mallstream = fopen (mallfile? mallfile: "/dev/null", "w");
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if (mallstream) {
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/* Be sure it doesn't malloc its buffer! */
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setbuf (mallstream, mallbuf);
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fprintf (mallstream, "= Start\n");
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old_free_hook = __free_hook;
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__free_hook = tr_freehook;
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old_malloc_hook = __malloc_hook;
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__malloc_hook = tr_mallochook;
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old_realloc_hook = __realloc_hook;
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__realloc_hook = tr_reallochook;
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}
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}
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}
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