JSValue JSFunction::callerGetter(ExecState* exec, JSValue slotBase, PropertyName) { JSFunction* thisObj = jsCast<JSFunction*>(slotBase); ASSERT(!thisObj->isHostFunction()); JSValue caller = retrieveCallerFunction(exec, thisObj); // See ES5.1 15.3.5.4 - Function.caller may not be used to retrieve a strict caller. if (!caller.isObject() || !asObject(caller)->inherits(JSFunction::info())) return caller; JSFunction* function = jsCast<JSFunction*>(caller); if (function->isHostFunction() || !function->jsExecutable()->isStrictMode()) return caller; return throwTypeError(exec, ASCIILiteral("Function.caller used to retrieve strict caller")); }
EncodedJSValue JSFunction::callerGetter(ExecState* exec, JSObject* slotBase, EncodedJSValue, PropertyName) { JSFunction* thisObj = jsCast<JSFunction*>(slotBase); ASSERT(!thisObj->isHostFunction()); JSValue caller = retrieveCallerFunction(exec, thisObj); // See ES5.1 15.3.5.4 - Function.caller may not be used to retrieve a strict caller. if (!caller.isObject() || !asObject(caller)->inherits(JSFunction::info())) { // It isn't a JSFunction, but if it is a JSCallee from a program or call eval, return null. if (jsDynamicCast<JSCallee*>(caller)) return JSValue::encode(jsNull()); return JSValue::encode(caller); } JSFunction* function = jsCast<JSFunction*>(caller); if (function->isHostOrBuiltinFunction() || !function->jsExecutable()->isStrictMode()) return JSValue::encode(caller); return JSValue::encode(throwTypeError(exec, ASCIILiteral("Function.caller used to retrieve strict caller"))); }
bool JSFunction::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const 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); 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()) { PropertySlot slot(thisObject); if (!Base::getOwnPropertySlot(thisObject, exec, propertyName, slot)) 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(), retrieveArguments(exec, thisObject)); } else if (propertyName == exec->propertyNames().caller) { if (thisObject->jsExecutable()->isStrictMode()) { PropertySlot slot(thisObject); if (!Base::getOwnPropertySlot(thisObject, exec, propertyName, slot)) 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(), retrieveCallerFunction(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) exec->vm().throwException(exec, createTypeError(exec, ASCIILiteral("Attempting to configurable attribute of unconfigurable property."))); return false; } if (descriptor.enumerablePresent() && descriptor.enumerable()) { if (throwException) exec->vm().throwException(exec, createTypeError(exec, ASCIILiteral("Attempting to change enumerable attribute of unconfigurable property."))); return false; } if (descriptor.isAccessorDescriptor()) { if (throwException) exec->vm().throwException(exec, createTypeError(exec, ASCIILiteral("Attempting to change access mechanism for an unconfigurable property."))); return false; } if (descriptor.writablePresent() && descriptor.writable()) { if (throwException) exec->vm().throwException(exec, createTypeError(exec, ASCIILiteral("Attempting to change writable attribute of unconfigurable property."))); return false; } if (!valueCheck) { if (throwException) exec->vm().throwException(exec, createTypeError(exec, ASCIILiteral("Attempting to change value of a readonly property."))); return false; } return true; }