C++ JSFunction::globalObject方法代码示例

bool JSFunction::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
    JSFunction* thisObject = jsCast<JSFunction*>(cell);
    if (thisObject->isHostFunction())
        return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);

    if (propertyName == exec->propertyNames().prototype) {
        JSGlobalData& globalData = exec->globalData();
        PropertyOffset offset = thisObject->getDirectOffset(globalData, propertyName);
        if (!isValidOffset(offset)) {
            JSObject* prototype = constructEmptyObject(exec);
            prototype->putDirect(globalData, exec->propertyNames().constructor, thisObject, DontEnum);
            thisObject->putDirect(globalData, exec->propertyNames().prototype, prototype, DontDelete | DontEnum);
            offset = thisObject->getDirectOffset(globalData, exec->propertyNames().prototype);
            ASSERT(isValidOffset(offset));
        }

        slot.setValue(thisObject, thisObject->getDirect(offset), offset);
    }

    if (propertyName == exec->propertyNames().arguments) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            bool result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
            if (!result) {
                thisObject->putDirectAccessor(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Accessor);
                result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
                ASSERT(result);
            }
            return result;
        }
        slot.setCacheableCustom(thisObject, argumentsGetter);
        return true;
    }

    if (propertyName == exec->propertyNames().length) {
        slot.setCacheableCustom(thisObject, lengthGetter);
        return true;
    }

    if (propertyName == exec->propertyNames().name) {
        slot.setCacheableCustom(thisObject, nameGetter);
        return true;
    }

    if (propertyName == exec->propertyNames().caller) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            bool result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
            if (!result) {
                thisObject->putDirectAccessor(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Accessor);
                result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
                ASSERT(result);
            }
            return result;
        }
        slot.setCacheableCustom(thisObject, callerGetter);
        return true;
    }

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

bool JSFunction::getOwnPropertySlot(JSCell* cell, ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    JSFunction* thisObject = static_cast<JSFunction*>(cell);
    if (thisObject->isHostFunction())
        return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);

    if (propertyName == exec->propertyNames().prototype) {
        WriteBarrierBase<Unknown>* location = thisObject->getDirectLocation(exec->globalData(), propertyName);

        if (!location) {
            JSObject* prototype = constructEmptyObject(exec, thisObject->globalObject()->emptyObjectStructure());
            prototype->putDirect(exec->globalData(), exec->propertyNames().constructor, thisObject, DontEnum);
            PutPropertySlot slot;
            thisObject->putDirect(exec->globalData(), exec->propertyNames().prototype, prototype, DontDelete | DontEnum, false, slot);
            location = thisObject->getDirectLocation(exec->globalData(), exec->propertyNames().prototype);
        }

        slot.setValue(thisObject, location->get(), thisObject->offsetForLocation(location));
    }

    if (propertyName == exec->propertyNames().arguments) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            bool result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
            if (!result) {
                thisObject->initializeGetterSetterProperty(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Getter | Setter);
                result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
                ASSERT(result);
            }
            return result;
        }
        slot.setCacheableCustom(thisObject, argumentsGetter);
        return true;
    }

    if (propertyName == exec->propertyNames().length) {
        slot.setCacheableCustom(thisObject, lengthGetter);
        return true;
    }

    if (propertyName == exec->propertyNames().caller) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            bool result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
            if (!result) {
                thisObject->initializeGetterSetterProperty(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Getter | Setter);
                result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
                ASSERT(result);
            }
            return result;
        }
        slot.setCacheableCustom(thisObject, callerGetter);
        return true;
    }

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

bool JSFunction::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
{
    JSFunction* thisObject = jsCast<JSFunction*>(object);
    if (thisObject->isHostFunction())
        return Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
    
    if (propertyName == exec->propertyNames().prototype) {
        PropertySlot slot;
        thisObject->methodTable()->getOwnPropertySlot(thisObject, exec, propertyName, slot);
        return Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
    }
    
    if (propertyName == exec->propertyNames().arguments) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            bool result = Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
            if (!result) {
                thisObject->putDirectAccessor(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Accessor);
                result = Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
                ASSERT(result);
            }
            return result;
        }
        descriptor.setDescriptor(exec->interpreter()->retrieveArgumentsFromVMCode(exec, thisObject), ReadOnly | DontEnum | DontDelete);
        return true;
    }
    
    if (propertyName == exec->propertyNames().length) {
        descriptor.setDescriptor(jsNumber(thisObject->jsExecutable()->parameterCount()), ReadOnly | DontEnum | DontDelete);
        return true;
    }
    
    if (propertyName == exec->propertyNames().name) {
        descriptor.setDescriptor(thisObject->jsExecutable()->nameValue(), ReadOnly | DontEnum | DontDelete);
        return true;
    }

    if (propertyName == exec->propertyNames().caller) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            bool result = Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
            if (!result) {
                thisObject->putDirectAccessor(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Accessor);
                result = Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
                ASSERT(result);
            }
            return result;
        }
        descriptor.setDescriptor(exec->interpreter()->retrieveCallerFromVMCode(exec, thisObject), ReadOnly | DontEnum | DontDelete);
        return true;
    }
    
    return Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
}

static EncodedJSValue JSC_HOST_CALL arrayBufferProtoFuncSlice(ExecState* exec)
{
    JSFunction* callee = jsCast<JSFunction*>(exec->callee());
    
    JSArrayBuffer* thisObject = jsDynamicCast<JSArrayBuffer*>(exec->thisValue());
    if (!thisObject)
        return throwVMError(exec, createTypeError(exec, ASCIILiteral("Receiver of slice must be an array buffer.")));
    
    if (!exec->argumentCount())
        return throwVMError(exec, createTypeError(exec, ASCIILiteral("Slice requires at least one argument.")));
    
    int32_t begin = exec->argument(0).toInt32(exec);
    if (exec->hadException())
        return JSValue::encode(jsUndefined());
    
    int32_t end;
    if (exec->argumentCount() >= 2) {
        end = exec->uncheckedArgument(1).toInt32(exec);
        if (exec->hadException())
            return JSValue::encode(jsUndefined());
    } else
        end = thisObject->impl()->byteLength();
    
    RefPtr<ArrayBuffer> newBuffer = thisObject->impl()->slice(begin, end);
    if (!newBuffer)
        return throwVMError(exec, createOutOfMemoryError(exec));
    
    Structure* structure = callee->globalObject()->arrayBufferStructure();
    
    JSArrayBuffer* result = JSArrayBuffer::create(exec->vm(), structure, newBuffer);
    
    return JSValue::encode(result);
}

EncodedJSValue JSC_HOST_CALL JSPromisePrototypeFuncThen(ExecState* exec)
{
    JSPromise* thisObject = jsDynamicCast<JSPromise*>(exec->thisValue());
    if (!thisObject)
        return throwVMError(exec, createTypeError(exec, "Receiver of then must be a Promise"));

    JSValue fulfillCallback = exec->argument(0);
    if (!fulfillCallback.isUndefined()) {
        CallData callData;
        CallType callType = getCallData(fulfillCallback, callData);
        if (callType == CallTypeNone)
            return throwVMError(exec, createTypeError(exec, "Expected function or undefined as as first argument"));
    }
    
    JSValue rejectCallback = exec->argument(1);
    if (!rejectCallback.isUndefined()) {
        CallData callData;
        CallType callType = getCallData(rejectCallback, callData);
        if (callType == CallTypeNone)
            return throwVMError(exec, createTypeError(exec, "Expected function or undefined as as second argument"));
    }

    JSFunction* callee = jsCast<JSFunction*>(exec->callee());
    JSGlobalObject* globalObject = callee->globalObject();

    // 1. Let promise be a new promise.
    JSPromise* promise = JSPromise::createWithResolver(exec->vm(), globalObject);

    // 2. Let resolver be promise's associated resolver.
    JSPromiseResolver* resolver = promise->resolver();

    // 3. Let fulfillWrapper be a promise wrapper callback for resolver and fulfillCallback if fulfillCallback is
    //    not omitted and a promise callback for resolver and its fulfill algorithm otherwise.
    InternalFunction* fulfillWrapper = wrapCallback(exec, globalObject, fulfillCallback, resolver, JSPromiseCallback::Fulfill);

    // 4. Let rejectWrapper be a promise wrapper callback for resolver and rejectCallback if rejectCallback is
    //    not omitted and a promise callback for resolver and its reject algorithm otherwise.
    InternalFunction* rejectWrapper = wrapCallback(exec, globalObject, rejectCallback, resolver, JSPromiseCallback::Reject);

    // 5. Append fulfillWrapper and rejectWrapper to the context object.
    thisObject->appendCallbacks(exec, fulfillWrapper, rejectWrapper);

    // 6. Return promise.
    return JSValue::encode(promise);
}

bool JSFunction::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor, bool throwException)
{
    JSFunction* thisObject = jsCast<JSFunction*>(object);
    if (thisObject->isHostFunction())
        return Base::defineOwnProperty(object, exec, propertyName, descriptor, throwException);

    if (propertyName == exec->propertyNames().prototype) {
        // Make sure prototype has been reified, such that it can only be overwritten
        // following the rules set out in ECMA-262 8.12.9.
        PropertySlot slot;
        thisObject->methodTable()->getOwnPropertySlot(thisObject, exec, propertyName, slot);
        thisObject->m_allocationProfile.clear();
        thisObject->m_allocationProfileWatchpoint.notifyWrite();
        return Base::defineOwnProperty(object, exec, propertyName, descriptor, throwException);
    }

    bool valueCheck;
    if (propertyName == exec->propertyNames().arguments) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            if (!Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor))
                thisObject->putDirectAccessor(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Accessor);
            return Base::defineOwnProperty(object, exec, propertyName, descriptor, throwException);
        }
        valueCheck = !descriptor.value() || sameValue(exec, descriptor.value(), exec->interpreter()->retrieveArgumentsFromVMCode(exec, thisObject));
    } else if (propertyName == exec->propertyNames().caller) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            if (!Base::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor))
                thisObject->putDirectAccessor(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Accessor);
            return Base::defineOwnProperty(object, exec, propertyName, descriptor, throwException);
        }
        valueCheck = !descriptor.value() || sameValue(exec, descriptor.value(), exec->interpreter()->retrieveCallerFromVMCode(exec, thisObject));
    } else if (propertyName == exec->propertyNames().length)
        valueCheck = !descriptor.value() || sameValue(exec, descriptor.value(), jsNumber(thisObject->jsExecutable()->parameterCount()));
    else if (propertyName == exec->propertyNames().name)
        valueCheck = !descriptor.value() || sameValue(exec, descriptor.value(), thisObject->jsExecutable()->nameValue());
    else
        return Base::defineOwnProperty(object, exec, propertyName, descriptor, throwException);
     
    if (descriptor.configurablePresent() && descriptor.configurable()) {
        if (throwException)
            throwError(exec, createTypeError(exec, ASCIILiteral("Attempting to configurable attribute of unconfigurable property.")));
        return false;
    }
    if (descriptor.enumerablePresent() && descriptor.enumerable()) {
        if (throwException)
            throwError(exec, createTypeError(exec, ASCIILiteral("Attempting to change enumerable attribute of unconfigurable property.")));
        return false;
    }
    if (descriptor.isAccessorDescriptor()) {
        if (throwException)
            throwError(exec, createTypeError(exec, ASCIILiteral("Attempting to change access mechanism for an unconfigurable property.")));
        return false;
    }
    if (descriptor.writablePresent() && descriptor.writable()) {
        if (throwException)
            throwError(exec, createTypeError(exec, ASCIILiteral("Attempting to change writable attribute of unconfigurable property.")));
        return false;
    }
    if (!valueCheck) {
        if (throwException)
            throwError(exec, createTypeError(exec, ASCIILiteral("Attempting to change value of a readonly property.")));
        return false;
    }
    return true;
}

bool JSFunction::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
    JSFunction* thisObject = jsCast<JSFunction*>(object);
    if (thisObject->isHostOrBuiltinFunction())
        return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);

    if (propertyName == exec->propertyNames().prototype) {
        VM& vm = exec->vm();
        unsigned attributes;
        PropertyOffset offset = thisObject->getDirectOffset(vm, propertyName, attributes);
        if (!isValidOffset(offset)) {
            JSObject* prototype = constructEmptyObject(exec);
            prototype->putDirect(vm, exec->propertyNames().constructor, thisObject, DontEnum);
            thisObject->putDirect(vm, exec->propertyNames().prototype, prototype, DontDelete | DontEnum);
            offset = thisObject->getDirectOffset(vm, exec->propertyNames().prototype, attributes);
            ASSERT(isValidOffset(offset));
        }

        slot.setValue(thisObject, attributes, thisObject->getDirect(offset), offset);
    }

    if (propertyName == exec->propertyNames().arguments) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            bool result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
            if (!result) {
                thisObject->putDirectAccessor(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec->vm()), DontDelete | DontEnum | Accessor);
                result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
                ASSERT(result);
            }
            return result;
        }
        slot.setCacheableCustom(thisObject, ReadOnly | DontEnum | DontDelete, argumentsGetter);
        return true;
    }

    if (propertyName == exec->propertyNames().length) {
        slot.setCacheableCustom(thisObject, ReadOnly | DontEnum | DontDelete, lengthGetter);
        return true;
    }

    if (propertyName == exec->propertyNames().name) {
        slot.setCacheableCustom(thisObject, ReadOnly | DontEnum | DontDelete, nameGetter);
        return true;
    }

    if (propertyName == exec->propertyNames().caller) {
        if (thisObject->jsExecutable()->isStrictMode()) {
            bool result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
            if (!result) {
                thisObject->putDirectAccessor(exec, propertyName, thisObject->globalObject()->throwTypeErrorGetterSetter(exec->vm()), DontDelete | DontEnum | Accessor);
                result = Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
                ASSERT(result);
            }
            return result;
        }
        slot.setCacheableCustom(thisObject, ReadOnly | DontEnum | DontDelete, callerGetter);
        return true;
    }

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