+ DECLARE_INFO;
+
+ static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(vm, globalObject, proto, TypeInfo(ActivationObjectType, StructureFlags), info()); }
+
+ WriteBarrierBase<Unknown>& registerAt(int) const;
+ bool isValidIndex(int) const;
+ bool isValid(const SymbolTableEntry&) const;
+ bool isTornOff();
+ int registersOffset();
+ static int registersOffset(SymbolTable*);
+
+protected:
+ static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesVisitChildren | OverridesGetPropertyNames | Base::StructureFlags;
+
+private:
+ bool symbolTableGet(PropertyName, PropertySlot&);
+ bool symbolTableGet(PropertyName, PropertyDescriptor&);
+ bool symbolTableGet(PropertyName, PropertySlot&, bool& slotIsWriteable);
+ bool symbolTablePut(ExecState*, PropertyName, JSValue, bool shouldThrow);
+ bool symbolTablePutWithAttributes(VM&, PropertyName, JSValue, unsigned attributes);
+
+ static EncodedJSValue argumentsGetter(ExecState*, JSObject*, EncodedJSValue, PropertyName);
+
+ static size_t allocationSize(SymbolTable*);
+ static size_t storageOffset();
+
+ WriteBarrier<Unknown>* storage(); // captureCount() number of registers.
+};
+
+extern int activationCount;
+extern int allTheThingsCount;
+
+inline JSActivation::JSActivation(VM& vm, CallFrame* callFrame, Register* registers, SymbolTable* symbolTable)
+ : Base(
+ vm,
+ callFrame->lexicalGlobalObject()->activationStructure(),
+ registers,
+ callFrame->scope(),
+ symbolTable)
+{
+ WriteBarrier<Unknown>* storage = this->storage();
+ size_t captureCount = symbolTable->captureCount();
+ for (size_t i = 0; i < captureCount; ++i)
+ new (NotNull, &storage[i]) WriteBarrier<Unknown>;
+}
+
+JSActivation* asActivation(JSValue);
+
+inline JSActivation* asActivation(JSValue value)
+{
+ ASSERT(asObject(value)->inherits(JSActivation::info()));
+ return jsCast<JSActivation*>(asObject(value));
+}
+
+ALWAYS_INLINE JSActivation* Register::activation() const
+{
+ return asActivation(jsValue());
+}
+
+inline int JSActivation::registersOffset(SymbolTable* symbolTable)
+{
+ return storageOffset() + ((symbolTable->captureCount() - symbolTable->captureStart() - 1) * sizeof(WriteBarrier<Unknown>));
+}
+
+inline void JSActivation::tearOff(VM& vm)
+{
+ ASSERT(!isTornOff());
+
+ WriteBarrierBase<Unknown>* dst = reinterpret_cast_ptr<WriteBarrierBase<Unknown>*>(
+ reinterpret_cast<char*>(this) + registersOffset(symbolTable()));
+ WriteBarrierBase<Unknown>* src = m_registers;
+
+ int captureEnd = symbolTable()->captureEnd();
+ for (int i = symbolTable()->captureStart(); i > captureEnd; --i)
+ dst[i].set(vm, this, src[i].get());
+
+ m_registers = dst;
+ ASSERT(isTornOff());
+}
+
+inline bool JSActivation::isTornOff()
+{
+ return m_registers == reinterpret_cast_ptr<WriteBarrierBase<Unknown>*>(
+ reinterpret_cast<char*>(this) + registersOffset(symbolTable()));
+}
+
+inline size_t JSActivation::storageOffset()
+{
+ return WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(JSActivation));
+}
+
+inline WriteBarrier<Unknown>* JSActivation::storage()
+{
+ return reinterpret_cast_ptr<WriteBarrier<Unknown>*>(
+ reinterpret_cast<char*>(this) + storageOffset());
+}
+
+inline size_t JSActivation::allocationSize(SymbolTable* symbolTable)
+{
+ size_t objectSizeInBytes = WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(JSActivation));
+ size_t storageSizeInBytes = symbolTable->captureCount() * sizeof(WriteBarrier<Unknown>);
+ return objectSizeInBytes + storageSizeInBytes;
+}
+
+inline bool JSActivation::isValidIndex(int index) const
+{
+ if (index > symbolTable()->captureStart())
+ return false;
+ if (index <= symbolTable()->captureEnd())
+ return false;
+ return true;
+}
+
+inline bool JSActivation::isValid(const SymbolTableEntry& entry) const
+{
+ return isValidIndex(entry.getIndex());
+}
+
+inline WriteBarrierBase<Unknown>& JSActivation::registerAt(int index) const
+{
+ ASSERT(isValidIndex(index));
+ return Base::registerAt(index);
+}