C++ PropertyName::asIndex方法代码示例

void Arguments::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
    Arguments* thisObject = jsCast<Arguments*>(cell);
    unsigned i = propertyName.asIndex();
    if (i < thisObject->d->numArguments && (!thisObject->d->deletedArguments || !thisObject->d->deletedArguments[i])) {
        ASSERT(i < PropertyName::NotAnIndex);
        thisObject->argument(i).set(exec->globalData(), thisObject, value);
        return;
    }

    if (propertyName == exec->propertyNames().length && !thisObject->d->overrodeLength) {
        thisObject->d->overrodeLength = true;
        thisObject->putDirect(exec->globalData(), propertyName, value, DontEnum);
        return;
    }

    if (propertyName == exec->propertyNames().callee && !thisObject->d->overrodeCallee) {
        if (!thisObject->d->isStrictMode) {
            thisObject->d->overrodeCallee = true;
            thisObject->putDirect(exec->globalData(), propertyName, value, DontEnum);
            return;
        }
        thisObject->createStrictModeCalleeIfNecessary(exec);
    }

    if (propertyName == exec->propertyNames().caller && thisObject->d->isStrictMode)
        thisObject->createStrictModeCallerIfNecessary(exec);

    JSObject::put(thisObject, exec, propertyName, value, slot);
}

void Arguments::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
    Arguments* thisObject = jsCast<Arguments*>(cell);
    unsigned i = propertyName.asIndex();
    if (thisObject->trySetArgument(exec->vm(), i, value))
        return;

    if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
        thisObject->m_overrodeLength = true;
        thisObject->putDirect(exec->vm(), propertyName, value, DontEnum);
        return;
    }

    if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
        if (!thisObject->m_isStrictMode) {
            thisObject->m_overrodeCallee = true;
            thisObject->putDirect(exec->vm(), propertyName, value, DontEnum);
            return;
        }
        thisObject->createStrictModeCalleeIfNecessary(exec);
    }

    if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
        thisObject->createStrictModeCallerIfNecessary(exec);

    JSObject::put(thisObject, exec, propertyName, value, slot);
}

bool Arguments::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
{
    Arguments* thisObject = jsCast<Arguments*>(object);
    unsigned i = propertyName.asIndex();
    if (i < thisObject->d->numArguments && (!thisObject->d->deletedArguments || !thisObject->d->deletedArguments[i])) {
        ASSERT(i < PropertyName::NotAnIndex);
        descriptor.setDescriptor(thisObject->argument(i).get(), None);
        return true;
    }
    
    if (propertyName == exec->propertyNames().length && LIKELY(!thisObject->d->overrodeLength)) {
        descriptor.setDescriptor(jsNumber(thisObject->d->numArguments), DontEnum);
        return true;
    }
    
    if (propertyName == exec->propertyNames().callee && LIKELY(!thisObject->d->overrodeCallee)) {
        if (!thisObject->d->isStrictMode) {
            descriptor.setDescriptor(thisObject->d->callee.get(), DontEnum);
            return true;
        }
        thisObject->createStrictModeCalleeIfNecessary(exec);
    }

    if (propertyName == exec->propertyNames().caller && thisObject->d->isStrictMode)
        thisObject->createStrictModeCallerIfNecessary(exec);
    
    return JSObject::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
}

bool Arguments::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
    Arguments* thisObject = jsCast<Arguments*>(cell);
    unsigned i = propertyName.asIndex();
    if (i < thisObject->d->numArguments && (!thisObject->d->deletedArguments || !thisObject->d->deletedArguments[i])) {
        ASSERT(i < PropertyName::NotAnIndex);
        slot.setValue(thisObject->argument(i).get());
        return true;
    }

    if (propertyName == exec->propertyNames().length && LIKELY(!thisObject->d->overrodeLength)) {
        slot.setValue(jsNumber(thisObject->d->numArguments));
        return true;
    }

    if (propertyName == exec->propertyNames().callee && LIKELY(!thisObject->d->overrodeCallee)) {
        if (!thisObject->d->isStrictMode) {
            slot.setValue(thisObject->d->callee.get());
            return true;
        }
        thisObject->createStrictModeCalleeIfNecessary(exec);
    }

    if (propertyName == exec->propertyNames().caller && thisObject->d->isStrictMode)
        thisObject->createStrictModeCallerIfNecessary(exec);

    return JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot);
}

bool Arguments::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName) 
{
    if (exec->vm().isInDefineOwnProperty())
        return Base::deleteProperty(cell, exec, propertyName);

    Arguments* thisObject = jsCast<Arguments*>(cell);
    unsigned i = propertyName.asIndex();
    if (i < thisObject->m_numArguments) {
        RELEASE_ASSERT(i < PropertyName::NotAnIndex);
        if (!Base::deleteProperty(cell, exec, propertyName))
            return false;
        if (thisObject->tryDeleteArgument(exec->vm(), i))
            return true;
    }

    if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
        thisObject->m_overrodeLength = true;
        return true;
    }

    if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
        if (!thisObject->m_isStrictMode) {
            thisObject->m_overrodeCallee = true;
            return true;
        }
        thisObject->createStrictModeCalleeIfNecessary(exec);
    }
    
    if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
        thisObject->createStrictModeCallerIfNecessary(exec);

    return JSObject::deleteProperty(thisObject, exec, propertyName);
}

bool Structure::prototypeChainMayInterceptStoreTo(JSGlobalData& globalData, PropertyName propertyName)
{
    unsigned i = propertyName.asIndex();
    if (i != PropertyName::NotAnIndex)
        return anyObjectInChainMayInterceptIndexedAccesses();
    
    for (Structure* current = this; ;) {
        JSValue prototype = current->storedPrototype();
        if (prototype.isNull())
            return false;
        
        current = prototype.asCell()->structure();
        
        unsigned attributes;
        JSCell* specificValue;
        PropertyOffset offset = current->get(globalData, propertyName, attributes, specificValue);
        if (!JSC::isValidOffset(offset))
            continue;
        
        if (attributes & (ReadOnly | Accessor))
            return true;
        
        return false;
    }
}

bool JSTestEventTarget::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
{
    JSTestEventTarget* thisObject = jsCast<JSTestEventTarget*>(object);
    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
    const HashEntry* entry = JSTestEventTargetTable.entry(exec, propertyName);
    if (entry) {
        PropertySlot slot(thisObject);
        slot.setCustom(thisObject, entry->propertyGetter());
        descriptor.setDescriptor(slot.getValue(exec, propertyName), entry->attributes());
        return true;
    }
    unsigned index = propertyName.asIndex();
    if (index != PropertyName::NotAnIndex && index < static_cast<TestEventTarget*>(thisObject->impl())->length()) {
        PropertySlot slot(thisObject);
        slot.setCustomIndex(thisObject, index, indexGetter);
        descriptor.setDescriptor(slot.getValue(exec, propertyName), DontDelete | ReadOnly);
        return true;
    }
    if (canGetItemsForName(exec, static_cast<TestEventTarget*>(thisObject->impl()), propertyName)) {
        PropertySlot slot(thisObject);
        slot.setCustom(thisObject, nameGetter);
        descriptor.setDescriptor(slot.getValue(exec, propertyName), ReadOnly | DontDelete | DontEnum);
        return true;
    }
    return getStaticValueDescriptor<JSTestEventTarget, Base>(exec, &JSTestEventTargetTable, thisObject, propertyName, descriptor);
}

bool JSFloat64Array::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
{
    JSFloat64Array* thisObject = jsCast<JSFloat64Array*>(object);
    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
    unsigned index = propertyName.asIndex();
    if (index != PropertyName::NotAnIndex && index < static_cast<Float64Array*>(thisObject->impl())->length()) {
        descriptor.setDescriptor(thisObject->getByIndex(exec, index), DontDelete);
        return true;
    }
    return getStaticValueDescriptor<JSFloat64Array, Base>(exec, getJSFloat64ArrayTable(exec), thisObject, propertyName, descriptor);
}

bool StringObject::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
{
    StringObject* thisObject = jsCast<StringObject*>(cell);
    if (propertyName == exec->propertyNames().length)
        return false;
    unsigned i = propertyName.asIndex();
    if (thisObject->internalValue()->canGetIndex(i)) {
        ASSERT(i != PropertyName::NotAnIndex); // No need for an explicit check, the above test would always fail!
        return false;
    }
    return JSObject::deleteProperty(thisObject, exec, propertyName);
}

bool Arguments::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor, bool shouldThrow)
{
    Arguments* thisObject = jsCast<Arguments*>(object);
    unsigned i = propertyName.asIndex();
    if (i < thisObject->d->numArguments) {
        ASSERT(i < PropertyName::NotAnIndex);
        // If the property is not yet present on the object, and is not yet marked as deleted, then add it now.
        PropertySlot slot;
        if ((!thisObject->d->deletedArguments || !thisObject->d->deletedArguments[i]) && !JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot))
            object->putDirect(exec->globalData(), propertyName, thisObject->argument(i).get(), 0);
        if (!Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow))
            return false;

        if (!thisObject->d->deletedArguments) {
            thisObject->d->deletedArguments = adoptArrayPtr(new bool[thisObject->d->numArguments]);
            memset(thisObject->d->deletedArguments.get(), 0, sizeof(bool) * thisObject->d->numArguments);
        }
        // From ES 5.1, 10.6 Arguments Object
        // 5. If the value of isMapped is not undefined, then
        if (!thisObject->d->deletedArguments[i]) {
            // a. If IsAccessorDescriptor(Desc) is true, then
            if (descriptor.isAccessorDescriptor()) {
                // i. Call the [[Delete]] internal method of map passing P, and false as the arguments.
                thisObject->d->deletedArguments[i] = true;
            } else { // b. Else
                // i. If Desc.[[Value]] is present, then
                // 1. Call the [[Put]] internal method of map passing P, Desc.[[Value]], and Throw as the arguments.
                if (descriptor.value())
                    thisObject->argument(i).set(exec->globalData(), thisObject, descriptor.value());
                // ii. If Desc.[[Writable]] is present and its value is false, then
                // 1. Call the [[Delete]] internal method of map passing P and false as arguments.
                if (descriptor.writablePresent() && !descriptor.writable())
                    thisObject->d->deletedArguments[i] = true;
            }
        }
        return true;
    }

    if (propertyName == exec->propertyNames().length && !thisObject->d->overrodeLength) {
        thisObject->putDirect(exec->globalData(), propertyName, jsNumber(thisObject->d->numArguments), DontEnum);
        thisObject->d->overrodeLength = true;
    } else if (propertyName == exec->propertyNames().callee && !thisObject->d->overrodeCallee) {
        thisObject->putDirect(exec->globalData(), propertyName, thisObject->d->callee.get(), DontEnum);
        thisObject->d->overrodeCallee = true;
    } else if (propertyName == exec->propertyNames().caller && thisObject->d->isStrictMode)
        thisObject->createStrictModeCallerIfNecessary(exec);

    return Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow);
}

bool Arguments::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow)
{
    Arguments* thisObject = jsCast<Arguments*>(object);
    unsigned i = propertyName.asIndex();
    if (i < thisObject->m_numArguments) {
        RELEASE_ASSERT(i < PropertyName::NotAnIndex);
        // If the property is not yet present on the object, and is not yet marked as deleted, then add it now.
        PropertySlot slot(thisObject);
        if (!thisObject->isDeletedArgument(i) && !JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot)) {
            JSValue value = thisObject->tryGetArgument(i);
            ASSERT(value);
            object->putDirectMayBeIndex(exec, propertyName, value);
        }
        if (!Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow))
            return false;

        // From ES 5.1, 10.6 Arguments Object
        // 5. If the value of isMapped is not undefined, then
        if (thisObject->isArgument(i)) {
            // a. If IsAccessorDescriptor(Desc) is true, then
            if (descriptor.isAccessorDescriptor()) {
                // i. Call the [[Delete]] internal method of map passing P, and false as the arguments.
                thisObject->tryDeleteArgument(exec->vm(), i);
            } else { // b. Else
                // i. If Desc.[[Value]] is present, then
                // 1. Call the [[Put]] internal method of map passing P, Desc.[[Value]], and Throw as the arguments.
                if (descriptor.value())
                    thisObject->trySetArgument(exec->vm(), i, descriptor.value());
                // ii. If Desc.[[Writable]] is present and its value is false, then
                // 1. Call the [[Delete]] internal method of map passing P and false as arguments.
                if (descriptor.writablePresent() && !descriptor.writable())
                    thisObject->tryDeleteArgument(exec->vm(), i);
            }
        }
        return true;
    }

    if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
        thisObject->putDirect(exec->vm(), propertyName, jsNumber(thisObject->m_numArguments), DontEnum);
        thisObject->m_overrodeLength = true;
    } else if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
        thisObject->putDirect(exec->vm(), propertyName, thisObject->m_callee.get(), DontEnum);
        thisObject->m_overrodeCallee = true;
    } else if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
        thisObject->createStrictModeCallerIfNecessary(exec);

    return Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow);
}

bool JSString::getStringPropertyDescriptor(ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
{
    if (propertyName == exec->propertyNames().length) {
        descriptor.setDescriptor(jsNumber(m_length), DontEnum | DontDelete | ReadOnly);
        return true;
    }
    
    unsigned i = propertyName.asIndex();
    if (i < m_length) {
        ASSERT(i != PropertyName::NotAnIndex); // No need for an explicit check, the above test would always fail!
        descriptor.setDescriptor(getIndex(exec, i), DontDelete | ReadOnly);
        return true;
    }
    
    return false;
}

void RuntimeArray::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
    RuntimeArray* thisObject = jsCast<RuntimeArray*>(cell);
    if (propertyName == exec->propertyNames().length) {
        throwError(exec, createRangeError(exec, "Range error"));
        return;
    }
    
    unsigned index = propertyName.asIndex();
    if (index != PropertyName::NotAnIndex) {
        thisObject->getConcreteArray()->setValueAt(exec, index, value);
        return;
    }
    
    JSObject::put(thisObject, exec, propertyName, value, slot);
}

bool RuntimeArray::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
    RuntimeArray* thisObject = jsCast<RuntimeArray*>(cell);
    if (propertyName == exec->propertyNames().length) {
        slot.setCacheableCustom(thisObject, thisObject->lengthGetter);
        return true;
    }
    
    unsigned index = propertyName.asIndex();
    if (index < thisObject->getLength()) {
        ASSERT(index != PropertyName::NotAnIndex);
        slot.setCustomIndex(thisObject, index, thisObject->indexGetter);
        return true;
    }
    
    return JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot);
}

bool JSFileList::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
    JSFileList* thisObject = jsCast<JSFileList*>(object);
    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
    const HashEntry* entry = getStaticValueSlotEntryWithoutCaching<JSFileList>(exec, propertyName);
    if (entry) {
        slot.setCustom(thisObject, entry->attributes(), entry->propertyGetter());
        return true;
    }
    unsigned index = propertyName.asIndex();
    if (index != PropertyName::NotAnIndex && index < thisObject->impl().length()) {
        unsigned attributes = DontDelete | ReadOnly;
        slot.setCustomIndex(thisObject, attributes, index, indexGetter);
        return true;
    }
    return getStaticValueSlot<JSFileList, Base>(exec, getJSFileListTable(exec), thisObject, propertyName, slot);
}