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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 "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*, 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         virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode);
     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         virtual JSValue toStrictThisObject(ExecState*) const;
     64 
     65         void copyRegisters(JSGlobalData&);
     66 
     67         static const ClassInfo s_info;
     68 
     69         static Structure* createStructure(JSGlobalData& globalData, JSValue proto) { return Structure::create(globalData, proto, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info); }
     70 
     71     protected:
     72         static const unsigned StructureFlags = OverridesGetOwnPropertySlot | NeedsThisConversion | OverridesMarkChildren | OverridesGetPropertyNames | JSVariableObject::StructureFlags;
     73 
     74     private:
     75         bool symbolTableGet(const Identifier&, PropertySlot&);
     76         bool symbolTableGet(const Identifier&, PropertyDescriptor&);
     77         bool symbolTableGet(const Identifier&, PropertySlot&, bool& slotIsWriteable);
     78         bool symbolTablePut(JSGlobalData&, const Identifier&, JSValue);
     79         bool symbolTablePutWithAttributes(JSGlobalData&, const Identifier&, JSValue, unsigned attributes);
     80 
     81         static JSValue argumentsGetter(ExecState*, JSValue, const Identifier&);
     82         NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();
     83 
     84         int m_numParametersMinusThis;
     85         int m_numCapturedVars : 31;
     86         bool m_requiresDynamicChecks : 1;
     87         int m_argumentsRegister;
     88     };
     89 
     90     JSActivation* asActivation(JSValue);
     91 
     92     inline JSActivation* asActivation(JSValue value)
     93     {
     94         ASSERT(asObject(value)->inherits(&JSActivation::s_info));
     95         return static_cast<JSActivation*>(asObject(value));
     96     }
     97 
     98     ALWAYS_INLINE JSActivation* Register::activation() const
     99     {
    100         return asActivation(jsValue());
    101     }
    102 
    103 } // namespace JSC
    104 
    105 #endif // JSActivation_h
    106