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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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