runtime/JSActivation.h

   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 "SymbolTable.h"
  35 #include "Nodes.h"
  36
  37 namespace JSC {
  38
  39     class Arguments;
  40     class Register;
  41
  42     class JSActivation : public JSVariableObject {
  43         typedef JSVariableObject Base;
  44     public:
  45         JSActivation(CallFrame*, NonNullPassRefPtr<FunctionExecutable>);
  46         virtual ~JSActivation();
  47
  48         virtual void markChildren(MarkStack&);
  49
  50         virtual bool isDynamicScope(bool& requiresDynamicChecks) const;
  51
  52         virtual bool isActivationObject() const { return true; }
  53
  54         virtual bool getOwnPropertySlot(ExecState*, const Identifier&, PropertySlot&);
  55
  56         virtual void put(ExecState*, const Identifier&, JSValue, PutPropertySlot&);
  57
  58         virtual void putWithAttributes(ExecState*, const Identifier&, JSValue, unsigned attributes);
  59         virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
  60
  61         virtual JSObject* toThisObject(ExecState*) const;
  62
  63         void copyRegisters(Arguments* arguments);
  64
  65         virtual const ClassInfo* classInfo() const { return &info; }
  66         static const ClassInfo info;
  67
  68         static PassRefPtr<Structure> createStructure(JSValue proto) { return Structure::create(proto, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount); }
  69
  70     protected:
  71         static const unsigned StructureFlags = OverridesGetOwnPropertySlot | NeedsThisConversion | OverridesMarkChildren | OverridesGetPropertyNames | JSVariableObject::StructureFlags;
  72
  73     private:
  74         struct JSActivationData : public JSVariableObjectData {
  75             JSActivationData(NonNullPassRefPtr<FunctionExecutable> _functionExecutable, Register* registers)
  76                 : JSVariableObjectData(_functionExecutable->generatedBytecode().symbolTable(), registers)
  77                 , functionExecutable(_functionExecutable)
  78             {
  79                 // We have to manually ref and deref the symbol table as JSVariableObjectData
  80                 // doesn't know about SharedSymbolTable
  81                 functionExecutable->generatedBytecode().sharedSymbolTable()->ref();
  82             }
  83             ~JSActivationData()
  84             {
  85                 static_cast<SharedSymbolTable*>(symbolTable)->deref();
  86             }
  87
  88             RefPtr<FunctionExecutable> functionExecutable;
  89         };
  90
  91         static JSValue argumentsGetter(ExecState*, JSValue, const Identifier&);
  92         NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();
  93
  94         JSActivationData* d() const { return static_cast<JSActivationData*>(JSVariableObject::d); }
  95     };
  96
  97     JSActivation* asActivation(JSValue);
  98
  99     inline JSActivation* asActivation(JSValue value)
 100     {
 101         ASSERT(asObject(value)->inherits(&JSActivation::info));
 102         return static_cast<JSActivation*>(asObject(value));
 103     }
 104
 105 } // namespace JSC
 106
 107 #endif // JSActivation_h