runtime/JSActivation.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  *
   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 visitChildren(SlotVisitor&);
  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 | OverridesVisitChildren | 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