n_exceptions.h

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/*
 * Nilorea Library
 * Copyright (C) 2005-2026 Castagnier Mickael
 *
 * 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 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 <https://www.gnu.org/licenses/>.
 */
 
#ifndef ____EXCEPTION___MANAGEMENT__FOR_C
#define ____EXCEPTION___MANAGEMENT__FOR_C
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>
 
#define NO_EXCEPTION 0
#define ARRAY_EXCEPTION 2
#define DIVZERO_EXCEPTION 4
#define OVERFLOW_EXCEPTION 8
#define PARSING_EXCEPTION 16
 
#define GENERAL_EXCEPTION (ARRAY_EXCEPTION | DIVZERO_EXCEPTION | OVERFLOW_EXCEPTION | PARSING_EXCEPTION)
 
typedef struct ExceptionContextList {
    jmp_buf context;
    struct ExceptionContextList* head;
} ExceptionContextList;
 
extern __thread ExceptionContextList* __Exceptions;
 
void push_exception(void);
void pop_exception(int ex);
 
#define Try                                     \
    {                                           \
        volatile int __exc_;                    \
        push_exception();                       \
        __exc_ = setjmp(__Exceptions->context); \
        if (__exc_ == NO_EXCEPTION) {
#define Catch(X)        \
    }                   \
    if (__exc_ & (X)) { \
        __exc_ = 0;
 
#define CatchAll()     \
    }                  \
    if (__exc_ != 0) { \
        __exc_ = 0;
 
#define EndTry             \
    }                      \
    pop_exception(__exc_); \
    }
 
#define Throw(X)                                                         \
    do {                                                                 \
        int __exc_val_ = (X);                                            \
        n_log(LOG_ERR, "Exception thrown: %d", __exc_val_);              \
        if (__Exceptions) {                                              \
            longjmp(__Exceptions->context, __exc_val_ ? __exc_val_ : 1); \
        } else {                                                         \
            n_log(LOG_ERR, "Throw called outside Try block!");           \
            abort();                                                     \
        }                                                                \
    } while (0)
 
#ifdef __cplusplus
}
#endif
 
#endif /* #ifndef ____EXCEPTION___MANAGEMENT__FOR_C  */