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
38namespace 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