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/*
* Copyright (C) 2006-2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#define _GNU_SOURCE
#ifdef HAVE_DLADDR
# include <dlfcn.h>
#endif /* HAVE_DLADDR */
#ifdef HAVE_BACKTRACE
# include <execinfo.h>
#endif /* HAVE_BACKTRACE */
#include <string.h>
#include "backtrace.h"
typedef struct private_backtrace_t private_backtrace_t;
/**
* Private data of an backtrace_t object.
*/
struct private_backtrace_t {
/**
* Public backtrace_t interface.
*/
backtrace_t public;
/**
* Number of stacks frames obtained in stack_frames
*/
int frame_count;
/**
* Recorded stack frames.
*/
void *frames[];
};
/**
* Implementation of backtrace_t.log
*/
static void log_(private_backtrace_t *this, FILE *file, bool detailed)
{
#ifdef HAVE_BACKTRACE
size_t i;
char **strings;
strings = backtrace_symbols(this->frames, this->frame_count);
fprintf(file, " dumping %d stack frame addresses:\n", this->frame_count);
for (i = 0; i < this->frame_count; i++)
{
#ifdef HAVE_DLADDR
Dl_info info;
if (dladdr(this->frames[i], &info))
{
char cmd[1024];
FILE *output;
int c;
void *ptr = this->frames[i];
if (strstr(info.dli_fname, ".so"))
{
ptr = (void*)(this->frames[i] - info.dli_fbase);
}
if (info.dli_sname)
{
fprintf(file, " \e[33m%s\e[0m @ %p (\e[31m%s\e[0m+0x%x) [%p]\n",
info.dli_fname, info.dli_fbase, info.dli_sname,
this->frames[i] - info.dli_saddr, this->frames[i]);
}
else
{
fprintf(file, " \e[33m%s\e[0m @ %p [%p]\n", info.dli_fname,
info.dli_fbase, this->frames[i]);
}
if (detailed)
{
fprintf(file, " -> \e[32m");
snprintf(cmd, sizeof(cmd), "addr2line -e %s %p",
info.dli_fname, ptr);
output = popen(cmd, "r");
if (output)
{
while (TRUE)
{
c = getc(output);
if (c == '\n' || c == EOF)
{
break;
}
fputc(c, file);
}
pclose(output);
}
else
{
#endif /* HAVE_DLADDR */
fprintf(file, " %s\n", strings[i]);
#ifdef HAVE_DLADDR
}
fprintf(file, "\n\e[0m");
}
}
else
{
fprintf(file, " %s\n", strings[i]);
}
#endif /* HAVE_DLADDR */
}
free (strings);
#else /* !HAVE_BACKTRACE */
fprintf(file, "C library does not support backtrace().\n");
#endif /* HAVE_BACKTRACE */
}
/**
* Implementation of backtrace_t.contains_function
*/
static bool contains_function(private_backtrace_t *this,
char *function[], int count)
{
#ifdef HAVE_DLADDR
int i, j;
for (i = 0; i< this->frame_count; i++)
{
Dl_info info;
if (dladdr(this->frames[i], &info) && info.dli_sname)
{
for (j = 0; j < count; j++)
{
if (streq(info.dli_sname, function[j]))
{
return TRUE;
}
}
}
}
#endif /* HAVE_DLADDR */
return FALSE;
}
/**
* Implementation of backtrace_t.destroy.
*/
static void destroy(private_backtrace_t *this)
{
free(this);
}
/**
* See header
*/
backtrace_t *backtrace_create(int skip)
{
private_backtrace_t *this;
void *frames[50];
int frame_count = 0;
#ifdef HAVE_BACKTRACE
frame_count = backtrace(frames, countof(frames));
#endif /* HAVE_BACKTRACE */
frame_count = max(frame_count - skip, 0);
this = malloc(sizeof(private_backtrace_t) + frame_count * sizeof(void*));
memcpy(this->frames, frames + skip, frame_count * sizeof(void*));
this->frame_count = frame_count;
this->public.log = (void(*)(backtrace_t*,FILE*,bool))log_;
this->public.contains_function = (bool(*)(backtrace_t*, char *function[], int count))contains_function;
this->public.destroy = (void(*)(backtrace_t*))destroy;
return &this->public;
}
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