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;
}
