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29 #ifndef JSActivation_h
30 #define JSActivation_h
32 #include "CodeBlock.h"
33 #include "CopiedSpaceInlines.h"
34 #include "JSVariableObject.h"
36 #include "SymbolTable.h"
42 class JSActivation : public JSVariableObject {
44 JSActivation(VM&, CallFrame*, Register*, SymbolTable*);
47 typedef JSVariableObject Base;
49 static JSActivation* create(VM& vm, CallFrame* callFrame, Register* registers, CodeBlock* codeBlock)
51 SymbolTable* symbolTable = codeBlock->symbolTable();
52 ASSERT(codeBlock->codeType() == FunctionCode);
53 JSActivation* activation = new (
55 allocateCell<JSActivation>(
57 allocationSize(symbolTable)
59 ) JSActivation(vm, callFrame, registers, symbolTable);
60 activation->finishCreation(vm);
64 static JSActivation* create(VM& vm, CallFrame* callFrame, CodeBlock* codeBlock)
66 return create(vm, callFrame, callFrame->registers(), codeBlock);
69 static void visitChildren(JSCell*, SlotVisitor&);
71 static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
72 static void getOwnNonIndexPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
74 static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
76 static bool deleteProperty(JSCell*, ExecState*, PropertyName);
78 static JSValue toThis(JSCell*, ExecState*, ECMAMode);
84 static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(vm, globalObject, proto, TypeInfo(ActivationObjectType, StructureFlags), info()); }
86 WriteBarrierBase<Unknown>& registerAt(int) const;
87 bool isValidIndex(int) const;
88 bool isValid(const SymbolTableEntry&) const;
90 int registersOffset();
91 static int registersOffset(SymbolTable*);
94 static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesVisitChildren | OverridesGetPropertyNames | Base::StructureFlags;
97 bool symbolTableGet(PropertyName, PropertySlot&);
98 bool symbolTableGet(PropertyName, PropertyDescriptor&);
99 bool symbolTableGet(PropertyName, PropertySlot&, bool& slotIsWriteable);
100 bool symbolTablePut(ExecState*, PropertyName, JSValue, bool shouldThrow);
101 bool symbolTablePutWithAttributes(VM&, PropertyName, JSValue, unsigned attributes);
103 static JSValue argumentsGetter(ExecState*, JSValue, PropertyName);
105 static size_t allocationSize(SymbolTable*);
106 static size_t storageOffset();
108 WriteBarrier<Unknown>* storage(); // captureCount() number of registers.
111 extern int activationCount;
112 extern int allTheThingsCount;
114 inline JSActivation::JSActivation(VM& vm, CallFrame* callFrame, Register* registers, SymbolTable* symbolTable)
117 callFrame->lexicalGlobalObject()->activationStructure(),
122 WriteBarrier<Unknown>* storage = this->storage();
123 size_t captureCount = symbolTable->captureCount();
124 for (size_t i = 0; i < captureCount; ++i)
125 new (NotNull, &storage[i]) WriteBarrier<Unknown>;
128 JSActivation* asActivation(JSValue);
130 inline JSActivation* asActivation(JSValue value)
132 ASSERT(asObject(value)->inherits(JSActivation::info()));
133 return jsCast<JSActivation*>(asObject(value));
136 ALWAYS_INLINE JSActivation* Register::activation() const
138 return asActivation(jsValue());
141 inline int JSActivation::registersOffset(SymbolTable* symbolTable)
143 return storageOffset() + ((symbolTable->captureCount() - symbolTable->captureStart() - 1) * sizeof(WriteBarrier<Unknown>));
146 inline void JSActivation::tearOff(VM& vm)
148 ASSERT(!isTornOff());
150 WriteBarrierBase<Unknown>* dst = reinterpret_cast_ptr<WriteBarrierBase<Unknown>*>(
151 reinterpret_cast<char*>(this) + registersOffset(symbolTable()));
152 WriteBarrierBase<Unknown>* src = m_registers;
154 int captureEnd = symbolTable()->captureEnd();
155 for (int i = symbolTable()->captureStart(); i > captureEnd; --i)
156 dst[i].set(vm, this, src[i].get());
162 inline bool JSActivation::isTornOff()
164 return m_registers == reinterpret_cast_ptr<WriteBarrierBase<Unknown>*>(
165 reinterpret_cast<char*>(this) + registersOffset(symbolTable()));
168 inline size_t JSActivation::storageOffset()
170 return WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(JSActivation));
173 inline WriteBarrier<Unknown>* JSActivation::storage()
175 return reinterpret_cast_ptr<WriteBarrier<Unknown>*>(
176 reinterpret_cast<char*>(this) + storageOffset());
179 inline size_t JSActivation::allocationSize(SymbolTable* symbolTable)
181 size_t objectSizeInBytes = WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(JSActivation));
182 size_t storageSizeInBytes = symbolTable->captureCount() * sizeof(WriteBarrier<Unknown>);
183 return objectSizeInBytes + storageSizeInBytes;
186 inline bool JSActivation::isValidIndex(int index) const
188 if (index > symbolTable()->captureStart())
190 if (index <= symbolTable()->captureEnd())
195 inline bool JSActivation::isValid(const SymbolTableEntry& entry) const
197 return isValidIndex(entry.getIndex());
200 inline WriteBarrierBase<Unknown>& JSActivation::registerAt(int index) const
202 ASSERT(isValidIndex(index));
203 return Base::registerAt(index);
208 #endif // JSActivation_h