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();

    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->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->symbolTable()->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