webkit/src/JavaScriptCore/interpreter/CallFrameClosure.h

/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef CallFrameClosure_h
#define CallFrameClosure_h

namespace JSC {

struct CallFrameClosure {
    CallFrame* oldCallFrame;
    CallFrame* newCallFrame;
    JSFunction* function;
    FunctionExecutable* functionExecutable;
    JSGlobalData* globalData;
    Register* oldEnd;
    ScopeChainNode* scopeChain;
    int expectedParams;
    int providedParams;
    
    void setArgument(int arg, JSValue value)
    {
        if (arg < expectedParams)
            newCallFrame[arg - RegisterFile::CallFrameHeaderSize - expectedParams] = value;
        else
            newCallFrame[arg - RegisterFile::CallFrameHeaderSize - expectedParams - providedParams] = value;
    }
    void resetCallFrame()
    {
        newCallFrame->setScopeChain(scopeChain);
        newCallFrame->setCalleeArguments(JSValue());
        for (int i = providedParams; i < expectedParams; ++i)
            newCallFrame[i - RegisterFile::CallFrameHeaderSize - expectedParams] = jsUndefined();
    }
};

}

#endif