interpreter/CallFrameClosure.h

   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     VM* vm;
  37     JSScope* scope;
  38     int parameterCountIncludingThis;
  39     int argumentCountIncludingThis;
  40
  41     void setThis(JSValue value)
  42     {
  43         newCallFrame->setThisValue(value);
  44     }
  45
  46     void setArgument(int argument, JSValue value)
  47     {
  48         newCallFrame->setArgument(argument, value);
  49     }
  50
  51     void resetCallFrame()
  52     {
  53         newCallFrame->setScope(scope);
  54         // setArgument() takes an arg index that starts from 0 for the first
  55         // argument after the 'this' value. Since both argumentCountIncludingThis
  56         // and parameterCountIncludingThis includes the 'this' value, we need to
  57         // subtract 1 from them to make i a valid argument index for setArgument().
  58         for (int i = argumentCountIncludingThis-1; i < parameterCountIncludingThis-1; ++i)
  59             newCallFrame->setArgument(i, jsUndefined());
  60     }
  61 };
  62
  63 }
  64
  65 #endif