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 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef JSNameScope_h
27#define JSNameScope_h
28
29#include "JSGlobalObject.h"
30#include "JSVariableObject.h"
31
32namespace JSC {
33
34// Used for scopes with a single named variable: catch and named function expression.
35class JSNameScope : public JSVariableObject {
36public:
37    typedef JSVariableObject Base;
38
39    static JSNameScope* create(ExecState* exec, const Identifier& identifier, JSValue value, unsigned attributes)
40    {
41        VM& vm = exec->vm();
42        JSNameScope* scopeObject = new (NotNull, allocateCell<JSNameScope>(vm.heap)) JSNameScope(vm, exec->lexicalGlobalObject(), exec->scope());
43        scopeObject->finishCreation(vm, identifier, value, attributes);
44        return scopeObject;
45    }
46
47    static JSNameScope* create(VM& vm, JSGlobalObject* globalObject, const Identifier& identifier, JSValue value, unsigned attributes, JSScope* next)
48    {
49        JSNameScope* scopeObject = new (NotNull, allocateCell<JSNameScope>(vm.heap)) JSNameScope(vm, globalObject, next);
50        scopeObject->finishCreation(vm, identifier, value, attributes);
51        return scopeObject;
52    }
53
54    static void visitChildren(JSCell*, SlotVisitor&);
55    static JSValue toThis(JSCell*, ExecState*, ECMAMode);
56    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
57    static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
58
59    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(vm, globalObject, proto, TypeInfo(NameScopeObjectType, StructureFlags), info()); }
60
61    DECLARE_INFO;
62
63protected:
64    void finishCreation(VM& vm, const Identifier& identifier, JSValue value, unsigned attributes)
65    {
66        Base::finishCreation(vm);
67        m_registerStore.set(vm, this, value);
68        symbolTable()->add(identifier.impl(), SymbolTableEntry(-1, attributes));
69    }
70
71    static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesVisitChildren | Base::StructureFlags;
72
73private:
74    JSNameScope(VM& vm, JSGlobalObject* globalObject, JSScope* next)
75        : Base(
76            vm,
77            globalObject->nameScopeStructure(),
78            reinterpret_cast<Register*>(&m_registerStore + 1),
79            next
80        )
81    {
82    }
83
84    WriteBarrier<Unknown> m_registerStore;
85};
86
87}
88
89#endif // JSNameScope_h
90