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/* $Id: stktrace.c,v 1.7 2001/08/22 20:30:24 dm Exp $ */
/*
*
* Copyright (C) 2000 David Mazieres (dm@uun.org)
*
* 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, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include "sysconf.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#ifdef DMALLOC
#include <dmalloc.h>
#endif /* DMALLOC */
#undef malloc
#undef free
#if __GNUC__ >= 2 && defined (__i386__)
static const char hexdigits[] = "0123456789abcdef";
struct traceback {
struct traceback *next;
char *name;
};
#define STKCACHESIZE 509U
static struct traceback *stkcache[STKCACHESIZE];
const char *
__backtrace (const char *file)
{
const void *const *framep;
size_t filelen;
char buf[256];
char *bp = buf + sizeof (buf);
u_long bucket = 5381;
struct traceback *tb;
filelen = strlen (file);
if (filelen >= sizeof (buf))
return file;
bp -= filelen + 1;
strcpy (bp, file);
__asm volatile ("movl %%ebp, %0" : "=g" (framep) :);
while (framep[0] && bp >= buf + 9) {
int i;
u_long pc = (u_long) framep[1] - 1;
framep = *framep;
bucket = ((bucket << 5) + bucket) ^ pc;
*--bp = ' ';
*--bp = hexdigits[pc & 0xf];
pc >>= 4;
for (i = 0; pc && i < 7; i++) {
*--bp = hexdigits[pc & 0xf];
pc >>= 4;
}
}
bucket = (bucket & 0xffffffff) % STKCACHESIZE;
for (tb = stkcache[bucket]; tb; tb = tb->next)
if (!strcmp (tb->name, bp))
return tb->name;
tb = malloc (sizeof (*tb));
if (!tb)
return file;
tb->name = malloc (1 + strlen (bp));
if (!tb->name) {
free (tb);
return file;
}
strcpy (tb->name, bp);
tb->next = stkcache[bucket];
stkcache[bucket] = tb;
return tb->name;
}
#else /* !gcc 2 || !i386 */
const char *
__backtrace (const char *file)
{
return file;
}
#endif /* !gcc 2 || !i386 */
#ifdef DMALLOC
#define dmalloc_logpath _dmalloc_logpath
extern char *dmalloc_logpath;
static int stktrace_record;
const char *
stktrace (const char *file)
{
if (stktrace_record < 0)
return file;
else if (!stktrace_record) {
if (!dmalloc_logpath || !(dmalloc_debug_current () & 2)
|| !getenv ("STKTRACE")) {
stktrace_record = -1;
return file;
}
stktrace_record = 1;
}
return __backtrace (file);
}
#endif /* DMALLOC */
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