runtime/JSActivation.h

   1 /*
   2  * Copyright (C) 2008 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  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef JSActivation_h
  30 #define JSActivation_h
  31
  32 #include "CodeBlock.h"
  33 #include "JSVariableObject.h"
  34 #include "RegisterFile.h"
  35 #include "SymbolTable.h"
  36 #include "Nodes.h"
  37
  38 namespace JSC {
  39
  40     class Arguments;
  41     class Register;
  42
  43     class JSActivation : public JSVariableObject {
  44         typedef JSVariableObject Base;
  45     public:
  46         JSActivation(CallFrame*, PassRefPtr<FunctionBodyNode>);
  47         virtual ~JSActivation();
  48
  49         virtual void mark();
  50
  51         virtual bool isDynamicScope() const;
  52
  53         virtual bool isActivationObject() const { return true; }
  54
  55         virtual bool getOwnPropertySlot(ExecState*, const Identifier&, PropertySlot&);
  56
  57         virtual void put(ExecState*, const Identifier&, JSValuePtr, PutPropertySlot&);
  58
  59         virtual void putWithAttributes(ExecState*, const Identifier&, JSValuePtr, unsigned attributes);
  60         virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
  61
  62         virtual JSObject* toThisObject(ExecState*) const;
  63
  64         void copyRegisters(Arguments* arguments);
  65
  66         virtual const ClassInfo* classInfo() const { return &info; }
  67         static const ClassInfo info;
  68
  69         static PassRefPtr<Structure> createStructure(JSValuePtr proto) { return Structure::create(proto, TypeInfo(ObjectType, NeedsThisConversion)); }
  70
  71     private:
  72         struct JSActivationData : public JSVariableObjectData {
  73             JSActivationData(PassRefPtr<FunctionBodyNode> functionBody, Register* registers)
  74                 : JSVariableObjectData(&functionBody->generatedBytecode().symbolTable(), registers)
  75                 , functionBody(functionBody)
  76             {
  77             }
  78
  79             RefPtr<FunctionBodyNode> functionBody;
  80         };
  81
  82         static JSValuePtr argumentsGetter(ExecState*, const Identifier&, const PropertySlot&);
  83         NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();
  84
  85         JSActivationData* d() const { return static_cast<JSActivationData*>(JSVariableObject::d); }
  86     };
  87
  88     JSActivation* asActivation(JSValuePtr);
  89
  90     inline JSActivation* asActivation(JSValuePtr value)
  91     {
  92         ASSERT(asObject(value)->inherits(&JSActivation::info));
  93         return static_cast<JSActivation*>(asObject(value));
  94     }
  95
  96 } // namespace JSC
  97
  98 #endif // JSActivation_h