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/*
* Copyright (c) International Business Machines Corp., 2014
*
* 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.
*
* 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
*/
/*
* File: exc.c
* Author: Shaun Wetzstein <shaun@us.ibm.com>
* Descr: {set,long}jmp implementation of exceptions for C code.
* Note: using these macros will create an exception context
* in each thread.
* Date: 7/06/09
*/
#include <errno.h>
#include <assert.h>
#include <pthread.h>
#include <stdio.h>
#include <stdarg.h>
#include <execinfo.h>
#include "exception.h"
#include "misc.h"
/* =======================================================================*/
const char *exception_name[] = {
"assertion",
"unexpected",
"errno",
};
typedef struct exception_context {
pthread_once_t once;
pthread_key_t key;
} exception_context;
/* =======================================================================*/
static exception_context __exc_ctx = { PTHREAD_ONCE_INIT, 0 };
static inline void __exc_key_create(void)
{
if (pthread_key_create(&__exc_ctx.key, NULL))
__exc_throw(ASSERTION, NULL, 0, __FILE__, __LINE__);
}
/* =======================================================================*/
void __exc_init(void)
{
if (pthread_once(&__exc_ctx.once, __exc_key_create))
__exc_throw(ASSERTION, NULL, 0, __FILE__, __LINE__);
}
exception_frame_t *__exc_get_frame(void)
{
return (exception_frame_t *) (pthread_getspecific(__exc_ctx.key));
}
void __exc_set_frame(exception_frame_t * f)
{
if (pthread_setspecific(__exc_ctx.key, f))
__exc_throw(ASSERTION, NULL, 0, __FILE__, __LINE__);
}
void __exc_backtrace(const char *fmt, ...)
{
if (fmt != NULL) {
va_list va;
va_start(va, fmt);
vfprintf(stderr, fmt, va);
va_end(va);
}
fprintf(stderr, "========== backtrace ==========\n");
void *bt[1024];
int nr = backtrace(bt, sizeof bt);
backtrace_symbols_fd(bt, nr, fileno(stderr));
fprintf(stderr, "========== backtrace ==========\n");
}
int __exc_throw(int ex, void *data, int size, const char *file, int line)
{
extern char *program_invocation_short_name;
exception_frame_t *frame = __exc_get_frame();
if (frame == NULL) {
__exc_backtrace
("*** UNHANDLED EXCEPTION *** -- %s: %s(%d) ex=%d\n\n",
program_invocation_short_name, file, line, ex);
abort();
}
if (frame->magic != EXC_MAGIC) {
__exc_backtrace
("*** CORRUPTED EXCEPTION FRAME *** -- %s: %s(%d) ex=%d\n\n",
program_invocation_short_name, file, line, ex);
abort();
}
frame->exc.file = file;
frame->exc.line = line;
frame->exc.data = data;
frame->exc.size = size;
longjmp(frame->jmp, ex);
return -1;
}
int __exc_rethrow(int ex, void *data, int size, const char *file, int line)
{
exception_frame_t *frame = __exc_get_frame();
if (frame != NULL)
__exc_set_frame(frame->prev);
return __exc_throw(ex, data, size, file, line);
}
const char *__exc_name(int exc)
{
return (exc < 0 || EXC_LAST <= exc) ? NULL : exception_name[exc];
}
__constructor void __exc_ctor(void)
{
__exc_init();
}
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