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/*
* Copyright (C) 2016 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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.
*/
#pragma once
#include "JSGlobalObject.h"
#include "ArrayConstructor.h"
#include "ArrayPrototype.h"
#include "JSCustomGetterFunction.h"
#include "JSCustomSetterFunction.h"
#include "JSFunction.h"
#include "LinkTimeConstant.h"
#include "ObjectPrototype.h"
#include <wtf/Hasher.h>
namespace JSC {
ALWAYS_INLINE bool JSGlobalObject::objectPrototypeIsSaneConcurrently(Structure* objectPrototypeStructure)
{
ASSERT(objectPrototypeStructure->typeInfo().isImmutablePrototypeExoticObject());
ASSERT(objectPrototypeStructure->storedPrototype().isNull());
return !hasIndexedProperties(objectPrototypeStructure->indexingType());
}
ALWAYS_INLINE bool JSGlobalObject::arrayPrototypeChainIsSaneConcurrently(Structure* arrayPrototypeStructure, Structure* objectPrototypeStructure)
{
return !hasIndexedProperties(arrayPrototypeStructure->indexingType())
&& arrayPrototypeStructure->hasMonoProto()
&& arrayPrototypeStructure->storedPrototype() == objectPrototype()
&& objectPrototypeIsSaneConcurrently(objectPrototypeStructure);
}
ALWAYS_INLINE bool JSGlobalObject::stringPrototypeChainIsSaneConcurrently(Structure* stringPrototypeStructure, Structure* objectPrototypeStructure)
{
return !hasIndexedProperties(stringPrototypeStructure->indexingType())
&& stringPrototypeStructure->hasMonoProto()
&& stringPrototypeStructure->storedPrototype() == objectPrototype()
&& objectPrototypeIsSaneConcurrently(objectPrototypeStructure);
}
ALWAYS_INLINE bool JSGlobalObject::arrayPrototypeChainIsSane()
{
ASSERT(!isCompilationThread() && !Thread::mayBeGCThread());
Structure* arrayPrototypeStructure = arrayPrototype()->structure();
Structure* objectPrototypeStructure = objectPrototype()->structure();
return arrayPrototypeChainIsSaneConcurrently(arrayPrototypeStructure, objectPrototypeStructure);
}
ALWAYS_INLINE bool JSGlobalObject::stringPrototypeChainIsSane()
{
ASSERT(!isCompilationThread() && !Thread::mayBeGCThread());
Structure* stringPrototypeStructure = stringPrototype()->structure();
Structure* objectPrototypeStructure = objectPrototype()->structure();
return stringPrototypeChainIsSaneConcurrently(stringPrototypeStructure, objectPrototypeStructure);
}
ALWAYS_INLINE bool JSGlobalObject::isArrayPrototypeIteratorProtocolFastAndNonObservable()
{
// We're fast if we don't have any indexed properties on the prototype.
// We're non-observable if the iteration protocol hasn't changed.
//
// Note: it only makes sense to call this from the main thread. If you're
// trying to prove this behavior on the compiler thread, you'll want to
// carefully set up watchpoints to have correct ordering while JS code is
// executing concurrently.
return arrayIteratorProtocolWatchpointSet().isStillValid() && !isHavingABadTime() && arrayPrototypeChainIsSane();
}
ALWAYS_INLINE bool JSGlobalObject::isTypedArrayPrototypeIteratorProtocolFastAndNonObservable(TypedArrayType typedArrayType)
{
ASSERT(!isCompilationThread() && !Thread::mayBeGCThread());
typedArrayPrototype(typedArrayType); // Materialize WatchpointSet.
// Since TypedArray iteration uses ArrayIterator, we need to check the state of ArrayIteratorProtocolWatchpointSet.
// But we do not need to check isHavingABadTime() and array prototype's chain.
if (!arrayIteratorProtocolWatchpointSet().isStillValid())
return false;
// This WatchpointSet ensures that
// 1. "length" getter is absent on derived TypedArray prototype (e.g. Uint8Array.prototype).
// 2. @@iterator function is absent on derived TypedArray prototype.
// 3. derived TypedArray prototype's [[Prototype]] is TypedArray.prototype.
if (typedArrayIteratorProtocolWatchpointSet(typedArrayType).state() != IsWatched)
return false;
// This WatchpointSet ensures that TypedArray.prototype has default "length" getter and @@iterator function.
if (typedArrayPrototypeIteratorProtocolWatchpointSet().state() != IsWatched)
return false;
return true;
}
// We're non-observable if the iteration protocol hasn't changed.
//
// Note: it only makes sense to call this from the main thread. If you're
// trying to prove this behavior on the compiler thread, you'll want to
// carefully set up watchpoints to have correct ordering while JS code is
// executing concurrently.
ALWAYS_INLINE bool JSGlobalObject::isMapPrototypeIteratorProtocolFastAndNonObservable()
{
return mapIteratorProtocolWatchpointSet().isStillValid();
}
ALWAYS_INLINE bool JSGlobalObject::isSetPrototypeIteratorProtocolFastAndNonObservable()
{
return setIteratorProtocolWatchpointSet().isStillValid();
}
ALWAYS_INLINE bool JSGlobalObject::isStringPrototypeIteratorProtocolFastAndNonObservable()
{
return stringIteratorProtocolWatchpointSet().isStillValid();
}
ALWAYS_INLINE bool JSGlobalObject::isMapPrototypeSetFastAndNonObservable()
{
return mapSetWatchpointSet().isStillValid();
}
ALWAYS_INLINE bool JSGlobalObject::isSetPrototypeAddFastAndNonObservable()
{
return setAddWatchpointSet().isStillValid();
}
ALWAYS_INLINE Structure* JSGlobalObject::arrayStructureForIndexingTypeDuringAllocation(JSGlobalObject* globalObject, IndexingType indexingType, JSValue newTarget) const
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (!newTarget || newTarget == globalObject->arrayConstructor())
return globalObject->arrayStructureForIndexingTypeDuringAllocation(indexingType);
auto* functionGlobalObject = getFunctionRealm(globalObject, asObject(newTarget));
RETURN_IF_EXCEPTION(scope, nullptr);
RELEASE_AND_RETURN(scope, InternalFunction::createSubclassStructure(globalObject, asObject(newTarget), functionGlobalObject->arrayStructureForIndexingTypeDuringAllocation(indexingType)));
}
inline JSFunction* JSGlobalObject::throwTypeErrorFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::throwTypeErrorFunction)); }
inline JSFunction* JSGlobalObject::iteratorProtocolFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::performIteration)); }
inline JSFunction* JSGlobalObject::newPromiseCapabilityFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::newPromiseCapability)); }
inline JSFunction* JSGlobalObject::resolvePromiseFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::resolvePromise)); }
inline JSFunction* JSGlobalObject::rejectPromiseFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::rejectPromise)); }
inline JSFunction* JSGlobalObject::promiseProtoThenFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::defaultPromiseThen)); }
inline JSFunction* JSGlobalObject::performPromiseThenFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::performPromiseThen)); }
inline JSFunction* JSGlobalObject::regExpProtoExecFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::regExpBuiltinExec)); }
inline GetterSetter* JSGlobalObject::regExpProtoGlobalGetter() const { return bitwise_cast<GetterSetter*>(linkTimeConstant(LinkTimeConstant::regExpProtoGlobalGetter)); }
inline GetterSetter* JSGlobalObject::regExpProtoUnicodeGetter() const { return bitwise_cast<GetterSetter*>(linkTimeConstant(LinkTimeConstant::regExpProtoUnicodeGetter)); }
ALWAYS_INLINE VM& getVM(JSGlobalObject* globalObject)
{
return globalObject->vm();
}
template<typename T>
inline unsigned JSGlobalObject::WeakCustomGetterOrSetterHash<T>::hash(const Weak<T>& value)
{
if (!value)
return 0;
return hash(value->propertyName(), value->customFunctionPointer(), value->slotBaseClassInfoIfExists());
}
template<typename T>
inline bool JSGlobalObject::WeakCustomGetterOrSetterHash<T>::equal(const Weak<T>& a, const Weak<T>& b)
{
if (!a || !b)
return false;
return a == b;
}
template<typename T>
inline unsigned JSGlobalObject::WeakCustomGetterOrSetterHash<T>::hash(const PropertyName& propertyName, typename T::CustomFunctionPointer functionPointer, const ClassInfo* classInfo)
{
if (!propertyName.isNull())
return WTF::computeHash(functionPointer, propertyName.uid()->existingSymbolAwareHash(), classInfo);
return WTF::computeHash(functionPointer, classInfo);
}
} // namespace JSC
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