Source/JavaScriptCore/runtime/JSGlobalObjectInlines.h

/*
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#pragma once

#include "JSGlobalObject.h"

#include "ArrayConstructor.h"
#include "ArrayPrototype.h"
#include "JSFunction.h"
#include "LinkTimeConstant.h"
#include "ObjectPrototype.h"

namespace JSC {

ALWAYS_INLINE bool JSGlobalObject::objectPrototypeIsSane()
{
    return !hasIndexedProperties(m_objectPrototype->indexingType())
        && m_objectPrototype->getPrototypeDirect(vm()).isNull();
}

ALWAYS_INLINE bool JSGlobalObject::arrayPrototypeChainIsSane()
{
    return !hasIndexedProperties(m_arrayPrototype->indexingType())
        && m_arrayPrototype->getPrototypeDirect(vm()) == m_objectPrototype.get()
        && objectPrototypeIsSane();
}

ALWAYS_INLINE bool JSGlobalObject::stringPrototypeChainIsSane()
{
    return !hasIndexedProperties(m_stringPrototype->indexingType())
        && m_stringPrototype->getPrototypeDirect(vm()) == m_objectPrototype.get()
        && objectPrototypeIsSane();
}

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();
}

// 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
{
    return !newTarget || newTarget == globalObject->arrayConstructor()
        ? globalObject->arrayStructureForIndexingTypeDuringAllocation(indexingType)
        : InternalFunction::createSubclassStructure(globalObject, asObject(newTarget), getFunctionRealm(globalObject->vm(), asObject(newTarget))->arrayStructureForIndexingTypeDuringAllocation(indexingType));
}

inline JSFunction* JSGlobalObject::throwTypeErrorFunction() const { return jsCast<JSFunction*>(linkTimeConstant(LinkTimeConstant::throwTypeErrorFunction)); }
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::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();
}

} // namespace JSC