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-/*
- * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- * its contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef JSActivation_h
-#define JSActivation_h
-
-#include "CodeBlock.h"
-#include "CopiedSpaceInlines.h"
-#include "JSVariableObject.h"
-#include "Nodes.h"
-#include "SymbolTable.h"
-
-namespace JSC {
-
- class Register;
-
- class JSActivation : public JSVariableObject {
- private:
- JSActivation(VM& vm, CallFrame*, SharedSymbolTable*);
-
- public:
- typedef JSVariableObject Base;
-
- static JSActivation* create(VM& vm, CallFrame* callFrame, CodeBlock* codeBlock)
- {
- SharedSymbolTable* symbolTable = codeBlock->symbolTable();
- JSActivation* activation = new (
- NotNull,
- allocateCell<JSActivation>(
- vm.heap,
- allocationSize(symbolTable)
- )
- ) JSActivation(vm, callFrame, symbolTable);
- activation->finishCreation(vm);
- return activation;
- }
-
- static void visitChildren(JSCell*, SlotVisitor&);
-
- bool isDynamicScope(bool& requiresDynamicChecks) const;
-
- static bool getOwnPropertySlot(JSCell*, ExecState*, PropertyName, PropertySlot&);
- static void getOwnNonIndexPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
- JS_EXPORT_PRIVATE static bool getOwnPropertyDescriptor(JSObject*, ExecState*, PropertyName, PropertyDescriptor&);
-
- static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
-
- static void putDirectVirtual(JSObject*, ExecState*, PropertyName, JSValue, unsigned attributes);
- static bool deleteProperty(JSCell*, ExecState*, PropertyName);
-
- static JSObject* toThisObject(JSCell*, ExecState*);
-
- void tearOff(VM&);
-
- static const ClassInfo s_info;
-
- static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(vm, globalObject, proto, TypeInfo(ActivationObjectType, StructureFlags), &s_info); }
-
- WriteBarrierBase<Unknown>& registerAt(int) const;
- bool isValidIndex(int) const;
- bool isValid(const SymbolTableEntry&) const;
- bool isTornOff();
- int registersOffset();
- static int registersOffset(SharedSymbolTable*);
-
- 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 JSValue argumentsGetter(ExecState*, JSValue, PropertyName);
- NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();
-
- static size_t allocationSize(SharedSymbolTable*);
- static size_t storageOffset();
-
- WriteBarrier<Unknown>* storage(); // captureCount() number of registers.
- };
-
- extern int activationCount;
- extern int allTheThingsCount;
-
- inline JSActivation::JSActivation(VM& vm, CallFrame* callFrame, SharedSymbolTable* symbolTable)
- : Base(
- vm,
- callFrame->lexicalGlobalObject()->activationStructure(),
- callFrame->registers(),
- callFrame->scope(),
- symbolTable
- )
- {
- WriteBarrier<Unknown>* storage = this->storage();
- size_t captureCount = symbolTable->captureCount();
- for (size_t i = 0; i < captureCount; ++i)
- new(&storage[i]) WriteBarrier<Unknown>;
- }
-
- JSActivation* asActivation(JSValue);
-
- inline JSActivation* asActivation(JSValue value)
- {
- ASSERT(asObject(value)->inherits(&JSActivation::s_info));
- return jsCast<JSActivation*>(asObject(value));
- }
-
- ALWAYS_INLINE JSActivation* Register::activation() const
- {
- return asActivation(jsValue());
- }
-
- inline bool JSActivation::isDynamicScope(bool& requiresDynamicChecks) const
- {
- requiresDynamicChecks = symbolTable()->usesNonStrictEval();
- return false;
- }
-
- inline int JSActivation::registersOffset(SharedSymbolTable* symbolTable)
- {
- return storageOffset() - (symbolTable->captureStart() * 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(SharedSymbolTable* 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);
- }
-
-} // namespace JSC
-
-#endif // JSActivation_h
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