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/* vim: set expandtab ts=4 sw=4: */
/*
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef Jmp_H
#define Jmp_H
#include "exception/ExceptionHandler.h"
#include <setjmp.h>
/**
* setjmp based exception handler.
*
* struct Jmp jmp;
* Jmp_try(jmp) {
* Do_somethingDangerous(&jmp.handler);
* } Jmp_catch {
* printf("failed %d %s", jmp.code, jmp.message);
* }
*
* Provides an easy way to implement the most basic try/catch functionality.
* the jmp structure must not be used for anything outside of the try block,
* calling jmp.handler.exception outside of a try block is undefined behavior.
*/
struct Jmp {
/** The exception handler which will trigger the entry into the catch block. */
struct ExceptionHandler handler;
/** The exception message if in the catch block, otherwise undefined. */
char* message;
/** The code if inside of the catch block, otherwise undefined. */
int code;
/** Internal setjmp buffer. */
jmp_buf buf;
};
/** Internal callback, this should not be called directly. */
Gcc_NORETURN
static void Jmp_callback(char* message, int code, struct ExceptionHandler* handler)
{
struct Jmp* jmp = (struct Jmp*) handler;
jmp->message = message;
jmp->code = code;
longjmp(jmp->buf, 1);
}
#define Jmp_try(jmp) \
jmp.handler.exception = Jmp_callback; \
if (!setjmp(jmp.buf))
// CHECKFILES_IGNORE squigly bracket will be added by the caller.
#define Jmp_catch else
#endif
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