runtime/JSStaticScopeObject.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  * 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 JSStaticScopeObject_h
  27 #define JSStaticScopeObject_h
  28
  29 #include "JSVariableObject.h"
  30
  31 namespace JSC{
  32
  33     class JSStaticScopeObject : public JSVariableObject {
  34     public:
  35         typedef JSVariableObject Base;
  36
  37         static JSStaticScopeObject* create(ExecState* exec, const Identifier& identifier, JSValue value, unsigned attributes)
  38         {
  39             JSStaticScopeObject* scopeObject = new (NotNull, allocateCell<JSStaticScopeObject>(*exec->heap())) JSStaticScopeObject(exec);
  40             scopeObject->finishCreation(exec, identifier, value, attributes);
  41             return scopeObject;
  42         }
  43
  44         static void visitChildren(JSCell*, SlotVisitor&);
  45         bool isDynamicScope(bool& requiresDynamicChecks) const;
  46         static JSObject* toThisObject(JSCell*, ExecState*);
  47         static bool getOwnPropertySlot(JSCell*, ExecState*, const Identifier&, PropertySlot&);
  48         static void put(JSCell*, ExecState*, const Identifier&, JSValue, PutPropertySlot&);
  49
  50         static void putDirectVirtual(JSObject*, ExecState*, const Identifier&, JSValue, unsigned attributes);
  51
  52         static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(globalData, globalObject, proto, TypeInfo(StaticScopeObjectType, StructureFlags), &s_info); }
  53
  54         static const ClassInfo s_info;
  55
  56     protected:
  57         void finishCreation(ExecState* exec, const Identifier& identifier, JSValue value, unsigned attributes)
  58         {
  59             Base::finishCreation(exec->globalData());
  60             m_registerStore.set(exec->globalData(), this, value);
  61             symbolTable().add(identifier.impl(), SymbolTableEntry(-1, attributes));
  62         }
  63         static const unsigned StructureFlags = IsEnvironmentRecord | OverridesGetOwnPropertySlot | OverridesVisitChildren | OverridesGetPropertyNames | JSVariableObject::StructureFlags;
  64
  65     private:
  66         JSStaticScopeObject(ExecState* exec)
  67             : JSVariableObject(exec->globalData(), exec->globalData().staticScopeStructure.get(), &m_symbolTable, reinterpret_cast<Register*>(&m_registerStore + 1))
  68         {
  69         }
  70
  71         static void destroy(JSCell*);
  72
  73         SymbolTable m_symbolTable;
  74         WriteBarrier<Unknown> m_registerStore;
  75     };
  76
  77     inline bool JSStaticScopeObject::isDynamicScope(bool&) const
  78     {
  79         return false;
  80     }
  81
  82 }
  83
  84 #endif // JSStaticScopeObject_h