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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef CallFrameClosure_h
     27 #define CallFrameClosure_h
     28 
     29 namespace JSC {
     30 
     31 struct CallFrameClosure {
     32     CallFrame* oldCallFrame;
     33     CallFrame* newCallFrame;
     34     JSFunction* function;
     35     FunctionExecutable* functionExecutable;
     36     JSGlobalData* globalData;
     37     Register* oldEnd;
     38     ScopeChainNode* scopeChain;
     39     int expectedParams;
     40     int providedParams;
     41 
     42     void setArgument(int arg, JSValue value)
     43     {
     44         if (arg < expectedParams)
     45             newCallFrame[arg - RegisterFile::CallFrameHeaderSize - expectedParams] = value;
     46         else
     47             newCallFrame[arg - RegisterFile::CallFrameHeaderSize - expectedParams - providedParams] = value;
     48     }
     49 
     50     void resetCallFrame()
     51     {
     52         newCallFrame->setScopeChain(scopeChain);
     53         for (int i = providedParams; i < expectedParams; ++i)
     54             newCallFrame[i - RegisterFile::CallFrameHeaderSize - expectedParams] = jsUndefined();
     55     }
     56 };
     57 
     58 }
     59 
     60 #endif
     61