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      1 /*
      2  * Copyright (C) 2008, 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  *
      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*, NonNullPassRefPtr<FunctionExecutable>);
     47         virtual ~JSActivation();
     48 
     49         virtual void markChildren(MarkStack&);
     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&, JSValue, PutPropertySlot&);
     58 
     59         virtual void putWithAttributes(ExecState*, const Identifier&, JSValue, 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(JSValue proto) { return Structure::create(proto, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount); }
     70 
     71     protected:
     72         static const unsigned StructureFlags = OverridesGetOwnPropertySlot | NeedsThisConversion | OverridesMarkChildren | OverridesGetPropertyNames | JSVariableObject::StructureFlags;
     73 
     74     private:
     75         struct JSActivationData : public JSVariableObjectData {
     76             JSActivationData(NonNullPassRefPtr<FunctionExecutable> _functionExecutable, Register* registers)
     77                 : JSVariableObjectData(_functionExecutable->generatedBytecode().symbolTable(), registers)
     78                 , functionExecutable(_functionExecutable)
     79             {
     80                 // We have to manually ref and deref the symbol table as JSVariableObjectData
     81                 // doesn't know about SharedSymbolTable
     82                 functionExecutable->generatedBytecode().sharedSymbolTable()->ref();
     83             }
     84             ~JSActivationData()
     85             {
     86                 static_cast<SharedSymbolTable*>(symbolTable)->deref();
     87             }
     88 
     89             RefPtr<FunctionExecutable> functionExecutable;
     90         };
     91 
     92         static JSValue argumentsGetter(ExecState*, const Identifier&, const PropertySlot&);
     93         NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();
     94 
     95         JSActivationData* d() const { return static_cast<JSActivationData*>(JSVariableObject::d); }
     96     };
     97 
     98     JSActivation* asActivation(JSValue);
     99 
    100     inline JSActivation* asActivation(JSValue value)
    101     {
    102         ASSERT(asObject(value)->inherits(&JSActivation::info));
    103         return static_cast<JSActivation*>(asObject(value));
    104     }
    105 
    106 } // namespace JSC
    107 
    108 #endif // JSActivation_h
    109