2 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
29 #ifndef JSActivation_h
30 #define JSActivation_h
32 #include "CodeBlock.h"
33 #include "JSVariableObject.h"
34 #include "SymbolTable.h"
42 class JSActivation : public JSVariableObject {
44 JSActivation(CallFrame*, FunctionExecutable*);
47 typedef JSVariableObject Base;
49 static JSActivation* create(JSGlobalData& globalData, CallFrame* callFrame, FunctionExecutable* funcExec)
51 JSActivation* activation = new (allocateCell<JSActivation>(globalData.heap)) JSActivation(callFrame, funcExec);
52 activation->finishCreation(callFrame);
56 static void finalize(JSCell*);
58 static void visitChildren(JSCell*, SlotVisitor&);
60 bool isDynamicScope(bool& requiresDynamicChecks) const;
62 static bool getOwnPropertySlot(JSCell*, ExecState*, const Identifier&, PropertySlot&);
63 static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
65 static void put(JSCell*, ExecState*, const Identifier&, JSValue, PutPropertySlot&);
67 static void putWithAttributes(JSObject*, ExecState*, const Identifier&, JSValue, unsigned attributes);
68 static bool deleteProperty(JSCell*, ExecState*, const Identifier& propertyName);
70 static JSObject* toThisObject(JSCell*, ExecState*);
72 void tearOff(JSGlobalData&);
74 static const ClassInfo s_info;
76 static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(globalData, globalObject, proto, TypeInfo(ActivationObjectType, StructureFlags), &s_info); }
79 void finishCreation(CallFrame*);
80 static const unsigned StructureFlags = IsEnvironmentRecord | OverridesGetOwnPropertySlot | OverridesVisitChildren | OverridesGetPropertyNames | JSVariableObject::StructureFlags;
83 bool symbolTableGet(const Identifier&, PropertySlot&);
84 bool symbolTableGet(const Identifier&, PropertyDescriptor&);
85 bool symbolTableGet(const Identifier&, PropertySlot&, bool& slotIsWriteable);
86 bool symbolTablePut(JSGlobalData&, const Identifier&, JSValue);
87 bool symbolTablePutWithAttributes(JSGlobalData&, const Identifier&, JSValue, unsigned attributes);
89 static JSValue argumentsGetter(ExecState*, JSValue, const Identifier&);
90 NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();
92 int m_numParametersMinusThis;
93 int m_numCapturedVars : 31;
94 bool m_requiresDynamicChecks : 1;
95 int m_argumentsRegister;
98 JSActivation* asActivation(JSValue);
100 inline JSActivation* asActivation(JSValue value)
102 ASSERT(asObject(value)->inherits(&JSActivation::s_info));
103 return static_cast<JSActivation*>(asObject(value));
106 ALWAYS_INLINE JSActivation* Register::activation() const
108 return asActivation(jsValue());
111 inline bool JSActivation::isDynamicScope(bool& requiresDynamicChecks) const
113 requiresDynamicChecks = m_requiresDynamicChecks;
117 inline void JSActivation::tearOff(JSGlobalData& globalData)
119 ASSERT(!m_registerArray);
121 size_t numLocals = m_numCapturedVars + m_numParametersMinusThis;
126 int registerOffset = m_numParametersMinusThis + RegisterFile::CallFrameHeaderSize;
127 size_t registerArraySize = numLocals + RegisterFile::CallFrameHeaderSize;
129 OwnArrayPtr<WriteBarrier<Unknown> > registerArray = copyRegisterArray(globalData, m_registers - registerOffset, registerArraySize, m_numParametersMinusThis + 1);
130 WriteBarrier<Unknown>* registers = registerArray.get() + registerOffset;
131 setRegisters(registers, registerArray.release());
136 #endif // JSActivation_h