If I call ExecuteStart I /must/ call ExecuteEnd.

[cycript.git] / Exception.hpp

/* Cycript - Optimizing JavaScript Compiler/Runtime
 * Copyright (C) 2009-2013  Jay Freeman (saurik)
*/

/* GNU General Public License, Version 3 {{{ */
/*
 * Cycript 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.
 *
 * Cycript 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 Cycript.  If not, see <http://www.gnu.org/licenses/>.
**/
/* }}} */

#ifndef CYCRIPT_EXCEPTION_HPP
#define CYCRIPT_EXCEPTION_HPP

#ifdef CY_EXECUTE
#include <JavaScriptCore/JSBase.h>
#endif

// XXX: does _assert really need this?
#include <errno.h>

#include "Standard.hpp"

class CYPool;

struct CYException {
    virtual ~CYException() {
    }

    virtual const char *PoolCString(CYPool &pool) const = 0;
#ifdef CY_EXECUTE
    virtual JSValueRef CastJSValue(JSContextRef context) const = 0;
#endif
};

void CYThrow(const char *format, ...) _noreturn;

#ifdef CY_EXECUTE
void CYThrow(JSContextRef context, JSValueRef value);
#endif

#define CYTry \
    try
#define CYCatch(value) \
    catch (const CYException &error) { \
        *exception = error.CastJSValue(context); \
        return value; \
    } catch (...) { \
        *exception = CYCastJSValue(context, "catch(...)"); \
        return value; \
    }

// XXX: fix this: _ is not safe; this is /not/ Menes ;P
#undef _assert
#define _assert(test, args...) do { \
    if (!(test)) \
        CYThrow("*** _assert(%s):%s(%u):%s [errno=%d]", #test, __FILE__, __LINE__, __FUNCTION__, errno); \
} while (false)

#define _trace() do { \
    fprintf(stderr, "_trace():%u\n", __LINE__); \
} while (false)

#define _syscall(expr) ({ \
    __typeof__(expr) _value; \
    do if ((long) (_value = (expr)) != -1) \
        break; \
    else switch (errno) { \
        case EINTR: \
            continue; \
        default: \
            _assert(false); \
    } while (true); \
    _value; \
})

#define _aprcall(expr) \
    do { \
        apr_status_t _aprstatus((expr)); \
        _assert(_aprstatus == APR_SUCCESS); \
    } while (false)

#define _krncall(expr) \
    do { \
        kern_return_t _krnstatus((expr)); \
        _assert(_krnstatus == KERN_SUCCESS); \
    } while (false)

#define _sqlcall(expr) ({ \
    __typeof__(expr) _value = (expr); \
    if (_value != 0 && (_value < 100 || _value >= 200)) \
        _assert(false, "_sqlcall(%u:%s): %s\n", _value, #expr, sqlite3_errmsg(database_)); \
    _value; \
})

struct CYJSException {
    JSContextRef context_;
    JSValueRef value_;

    CYJSException(JSContextRef context) :
        context_(context),
        value_(NULL)
    {
    }

    ~CYJSException() {
        CYThrow(context_, value_);
    }

    operator JSValueRef *() {
        return &value_;
    }
};

#define _jsccall(code, args...) ({ \
    CYJSException _error(context); \
    (code)(args, _error); \
})

#endif/*CYCRIPT_ERROR_HPP*/