Initial revision

1 files changed, 129 insertions, 0 deletions

diff --git a/gdb/mtrace.c b/gdb/mtrace.c
new file mode 100755
index 0000000..2b8222f
--- /dev/null
+++ b/gdb/mtrace.c
@@ -0,0 +1,129 @@
+/* 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 1, 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.
+
+   The author may be reached (Email) at the address mike@ai.mit.edu,
+   or (US mail) as Mike Haertel c/o Free Software Foundation. */
+
+#include <stdio.h>
+#include "ansidecl.h"
+#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 = 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 = 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;
+}
+
+void
+mtrace()
+{
+  char *mallfile;
+
+  mallfile = getenv (mallenv);
+  if (mallfile) {
+    mallstream = fopen (mallfile, "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;
+    }
+  }
+}