bool
BaseDOMProxyHandler::getPropertyDescriptor(JSContext* cx,
JS::Handle<JSObject*> proxy,
JS::Handle<jsid> id,
MutableHandle<JSPropertyDescriptor> desc,
unsigned flags)
{
if (!getOwnPropertyDescriptor(cx, proxy, id, desc, flags)) {
return false;
}
if (desc.object()) {
return true;
}
JS::Rooted<JSObject*> proto(cx);
if (!js::GetObjectProto(cx, proxy, &proto)) {
return false;
}
if (!proto) {
desc.object().set(nullptr);
return true;
}
return JS_GetPropertyDescriptorById(cx, proto, id, 0, desc);
}
bool
ModuleNamespaceObject::ProxyHandler::getOwnPropertyDescriptor(JSContext* cx, HandleObject proxy,
HandleId id,
MutableHandle<PropertyDescriptor> desc) const
{
Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
if (JSID_IS_SYMBOL(id)) {
Rooted<JS::Symbol*> symbol(cx, JSID_TO_SYMBOL(id));
if (symbol == cx->wellKnownSymbols().iterator) {
RootedValue enumerateFun(cx, getEnumerateFunction(proxy));
desc.object().set(proxy);
desc.setConfigurable(false);
desc.setEnumerable(false);
desc.setValue(enumerateFun);
return true;
}
if (symbol == cx->wellKnownSymbols().toStringTag) {
RootedValue value(cx, StringValue(cx->names().Module));
desc.object().set(proxy);
desc.setWritable(false);
desc.setEnumerable(false);
desc.setConfigurable(true);
desc.setValue(value);
return true;
}
return true;
}
const IndirectBindingMap& bindings = ns->bindings();
ModuleEnvironmentObject* env;
Shape* shape;
if (!bindings.lookup(id, &env, &shape))
return true;
RootedValue value(cx, env->getSlot(shape->slot()));
if (value.isMagic(JS_UNINITIALIZED_LEXICAL)) {
ReportRuntimeLexicalError(cx, JSMSG_UNINITIALIZED_LEXICAL, id);
return false;
}
desc.object().set(env);
desc.setConfigurable(false);
desc.setEnumerable(true);
desc.setValue(value);
return true;
}
bool
JavaScriptShared::toDescriptor(JSContext* cx, const PPropertyDescriptor& in,
MutableHandle<JSPropertyDescriptor> out)
{
out.setAttributes(in.attrs());
if (!fromVariant(cx, in.value(), out.value()))
return false;
out.object().set(fromObjectOrNullVariant(cx, in.obj()));
if (in.getter().type() == GetterSetter::Tuint64_t && !in.getter().get_uint64_t()) {
out.setGetter(nullptr);
} else if (in.attrs() & JSPROP_GETTER) {
Rooted<JSObject*> getter(cx);
getter = fromObjectVariant(cx, in.getter().get_ObjectVariant());
if (!getter)
return false;
out.setGetter(JS_DATA_TO_FUNC_PTR(JSGetterOp, getter.get()));
} else {
out.setGetter(UnknownPropertyStub);
}
if (in.setter().type() == GetterSetter::Tuint64_t && !in.setter().get_uint64_t()) {
out.setSetter(nullptr);
} else if (in.attrs() & JSPROP_SETTER) {
Rooted<JSObject*> setter(cx);
setter = fromObjectVariant(cx, in.setter().get_ObjectVariant());
if (!setter)
return false;
out.setSetter(JS_DATA_TO_FUNC_PTR(JSSetterOp, setter.get()));
} else {
out.setSetter(UnknownStrictPropertyStub);
}
return true;
}
bool
OpaqueCrossCompartmentWrapper::getOwnPropertyDescriptor(JSContext* cx,
HandleObject wrapper,
HandleId id,
MutableHandle<PropertyDescriptor> desc) const
{
desc.object().set(nullptr);
return true;
}
bool
js::SetPropertyIgnoringNamedGetter(JSContext* cx, const BaseProxyHandler* handler,
HandleObject proxy, HandleObject receiver,
HandleId id, MutableHandle<PropertyDescriptor> desc,
bool descIsOwn, bool strict, MutableHandleValue vp)
{
/* The control-flow here differs from ::get() because of the fall-through case below. */
MOZ_ASSERT_IF(descIsOwn, desc.object());
if (desc.object()) {
MOZ_ASSERT(desc.getter() != JS_PropertyStub);
MOZ_ASSERT(desc.setter() != JS_StrictPropertyStub);
// Check for read-only properties.
if (desc.isReadonly()) {
if (strict)
return Throw(cx, id, descIsOwn ? JSMSG_READ_ONLY : JSMSG_CANT_REDEFINE_PROP);
return true;
}
if (desc.hasSetterObject() || desc.setter()) {
if (!CallSetter(cx, receiver, id, desc.setter(), desc.attributes(), strict, vp))
return false;
if (!proxy->is<ProxyObject>() || proxy->as<ProxyObject>().handler() != handler)
return true;
if (desc.isShared())
return true;
}
desc.value().set(vp.get());
if (descIsOwn) {
MOZ_ASSERT(desc.object() == proxy);
return handler->defineProperty(cx, proxy, id, desc);
}
return DefineProperty(cx, receiver, id, desc.value(),
desc.getter(), desc.setter(), desc.attributes());
}
desc.object().set(receiver);
desc.value().set(vp.get());
desc.setAttributes(JSPROP_ENUMERATE);
desc.setGetter(nullptr);
desc.setSetter(nullptr); // Pick up the class getter/setter.
return DefineProperty(cx, receiver, id, desc.value(), nullptr, nullptr, JSPROP_ENUMERATE);
}
bool
BaseProxyHandler::getPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
MutableHandle<PropertyDescriptor> desc) const
{
assertEnteredPolicy(cx, proxy, id, GET | SET | GET_PROPERTY_DESCRIPTOR);
if (!getOwnPropertyDescriptor(cx, proxy, id, desc))
return false;
if (desc.object())
return true;
RootedObject proto(cx);
if (!GetPrototype(cx, proxy, &proto))
return false;
if (!proto) {
MOZ_ASSERT(!desc.object());
return true;
}
return GetPropertyDescriptor(cx, proto, id, desc);
}
bool
AddonWrapper<Base>::getOwnPropertyDescriptor(JSContext* cx, HandleObject wrapper,
HandleId id, MutableHandle<JSPropertyDescriptor> desc) const
{
if (!InterposeProperty(cx, wrapper, nullptr, id, desc))
return false;
if (desc.object())
return true;
return Base::getOwnPropertyDescriptor(cx, wrapper, id, desc);
}
bool
Proxy::getOwnPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
MutableHandle<PropertyDescriptor> desc)
{
if (!CheckRecursionLimit(cx))
return false;
const BaseProxyHandler* handler = proxy->as<ProxyObject>().handler();
desc.object().set(nullptr); // default result if we refuse to perform this action
AutoEnterPolicy policy(cx, handler, proxy, id, BaseProxyHandler::GET_PROPERTY_DESCRIPTOR, true);
if (!policy.allowed())
return policy.returnValue();
return handler->getOwnPropertyDescriptor(cx, proxy, id, desc);
}
bool
JSCompartment::wrap(JSContext* cx, MutableHandle<PropertyDescriptor> desc)
{
if (!wrap(cx, desc.object()))
return false;
if (desc.hasGetterObject()) {
if (!wrap(cx, desc.getterObject()))
return false;
}
if (desc.hasSetterObject()) {
if (!wrap(cx, desc.setterObject()))
return false;
}
return wrap(cx, desc.value());
}
bool
JavaScriptShared::toDescriptor(JSContext *cx, const PPropertyDescriptor &in,
MutableHandle<JSPropertyDescriptor> out)
{
out.setAttributes(in.attrs());
out.setShortId(in.shortid());
if (!toValue(cx, in.value(), out.value()))
return false;
Rooted<JSObject*> obj(cx);
if (!unwrap(cx, in.objId(), &obj))
return false;
out.object().set(obj);
if (!in.getter()) {
out.setGetter(nullptr);
} else if (in.attrs() & JSPROP_GETTER) {
Rooted<JSObject*> getter(cx);
if (!unwrap(cx, in.getter(), &getter))
return false;
out.setGetter(JS_DATA_TO_FUNC_PTR(JSPropertyOp, getter.get()));
} else {
if (in.getter() == DefaultPropertyOp)
out.setGetter(JS_PropertyStub);
else
out.setGetter(UnknownPropertyStub);
}
if (!in.setter()) {
out.setSetter(nullptr);
} else if (in.attrs() & JSPROP_SETTER) {
Rooted<JSObject*> setter(cx);
if (!unwrap(cx, in.setter(), &setter))
return false;
out.setSetter(JS_DATA_TO_FUNC_PTR(JSStrictPropertyOp, setter.get()));
} else {
if (in.setter() == DefaultPropertyOp)
out.setSetter(JS_StrictPropertyStub);
else if (in.setter() == GetterOnlyPropertyStub)
out.setSetter(js_GetterOnlyPropertyStub);
else
out.setSetter(UnknownStrictPropertyStub);
}
return true;
}
bool impl(JSContext *cx, HandleObject proxy, HandleId id,
MutableHandle<JSPropertyDescriptor> desc, bool ownOnly) const
{
if (JSID_IS_STRING(id)) {
bool match;
if (!JS_StringEqualsAscii(cx, JSID_TO_STRING(id), "phantom", &match))
return false;
if (match) {
desc.object().set(proxy);
desc.attributesRef() = JSPROP_READONLY | JSPROP_ENUMERATE;
desc.value().setInt32(42);
return true;
}
}
if (ownOnly)
return DirectProxyHandler::getOwnPropertyDescriptor(cx, proxy, id, desc);
return DirectProxyHandler::getPropertyDescriptor(cx, proxy, id, desc);
}
// ES6 (5 April 2014) 9.5.5 Proxy.[[GetOwnProperty]](P)
bool
ScriptedDirectProxyHandler::getOwnPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
MutableHandle<PropertyDescriptor> desc) const
{
// step 2
RootedObject handler(cx, GetDirectProxyHandlerObject(proxy));
// step 3
if (!handler) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_PROXY_REVOKED);
return false;
}
// step 4
RootedObject target(cx, proxy->as<ProxyObject>().target());
// step 5-6
RootedValue trap(cx);
if (!GetProperty(cx, handler, handler, cx->names().getOwnPropertyDescriptor, &trap))
return false;
// step 7
if (trap.isUndefined())
return GetOwnPropertyDescriptor(cx, target, id, desc);
// step 8-9
RootedValue propKey(cx);
if (!IdToStringOrSymbol(cx, id, &propKey))
return false;
Value argv[] = {
ObjectValue(*target),
propKey
};
RootedValue trapResult(cx);
if (!Invoke(cx, ObjectValue(*handler), trap, ArrayLength(argv), argv, &trapResult))
return false;
// step 10
if (!trapResult.isUndefined() && !trapResult.isObject()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_PROXY_GETOWN_OBJORUNDEF);
return false;
}
//step 11-12
Rooted<PropertyDescriptor> targetDesc(cx);
if (!GetOwnPropertyDescriptor(cx, target, id, &targetDesc))
return false;
// step 13
if (trapResult.isUndefined()) {
// substep a
if (!targetDesc.object()) {
desc.object().set(nullptr);
return true;
}
// substep b
if (!targetDesc.configurable()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_REPORT_NC_AS_NE);
return false;
}
// substep c-e
bool extensibleTarget;
if (!IsExtensible(cx, target, &extensibleTarget))
return false;
if (!extensibleTarget) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_REPORT_E_AS_NE);
return false;
}
// substep f
desc.object().set(nullptr);
return true;
}
// step 14-15
bool extensibleTarget;
if (!IsExtensible(cx, target, &extensibleTarget))
return false;
// step 16-17
Rooted<PropertyDescriptor> resultDesc(cx);
if (!ToPropertyDescriptor(cx, trapResult, true, &resultDesc))
return false;
// step 18
CompletePropertyDescriptor(&resultDesc);
// step 19
bool valid;
if (!ValidatePropertyDescriptor(cx, extensibleTarget, resultDesc, targetDesc, &valid))
return false;
// step 20
if (!valid) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_REPORT_INVALID);
return false;
}
// step 21
if (!resultDesc.configurable()) {
if (!targetDesc.object()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_REPORT_NE_AS_NC);
return false;
}
if (targetDesc.configurable()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_REPORT_C_AS_NC);
return false;
}
}
// step 22
desc.set(resultDesc);
desc.object().set(proxy);
return true;
}
bool
js::SetPropertyIgnoringNamedGetter(JSContext *cx, const BaseProxyHandler *handler,
HandleObject proxy, HandleObject receiver,
HandleId id, MutableHandle<PropertyDescriptor> desc,
bool descIsOwn, bool strict, MutableHandleValue vp)
{
/* The control-flow here differs from ::get() because of the fall-through case below. */
if (descIsOwn) {
MOZ_ASSERT(desc.object());
// Check for read-only properties.
if (desc.isReadonly())
return strict ? Throw(cx, id, JSMSG_READ_ONLY) : true;
if (!desc.setter()) {
// Be wary of the odd explicit undefined setter case possible through
// Object.defineProperty.
if (!desc.hasSetterObject())
desc.setSetter(JS_StrictPropertyStub);
} else if (desc.hasSetterObject() || desc.setter() != JS_StrictPropertyStub) {
if (!CallSetter(cx, receiver, id, desc.setter(), desc.attributes(), strict, vp))
return false;
if (!proxy->is<ProxyObject>() || proxy->as<ProxyObject>().handler() != handler)
return true;
if (desc.isShared())
return true;
}
if (!desc.getter()) {
// Same as above for the null setter case.
if (!desc.hasGetterObject())
desc.setGetter(JS_PropertyStub);
}
desc.value().set(vp.get());
return handler->defineProperty(cx, receiver, id, desc);
}
if (desc.object()) {
// Check for read-only properties.
if (desc.isReadonly())
return strict ? Throw(cx, id, JSMSG_CANT_REDEFINE_PROP) : true;
if (!desc.setter()) {
// Be wary of the odd explicit undefined setter case possible through
// Object.defineProperty.
if (!desc.hasSetterObject())
desc.setSetter(JS_StrictPropertyStub);
} else if (desc.hasSetterObject() || desc.setter() != JS_StrictPropertyStub) {
if (!CallSetter(cx, receiver, id, desc.setter(), desc.attributes(), strict, vp))
return false;
if (!proxy->is<ProxyObject>() || proxy->as<ProxyObject>().handler() != handler)
return true;
if (desc.isShared())
return true;
}
if (!desc.getter()) {
// Same as above for the null setter case.
if (!desc.hasGetterObject())
desc.setGetter(JS_PropertyStub);
}
desc.value().set(vp.get());
return JSObject::defineGeneric(cx, receiver, id, desc.value(),
desc.getter(), desc.setter(), desc.attributes());
}
desc.object().set(receiver);
desc.value().set(vp.get());
desc.setAttributes(JSPROP_ENUMERATE);
desc.setGetter(nullptr);
desc.setSetter(nullptr); // Pick up the class getter/setter.
return JSObject::defineGeneric(cx, receiver, id, desc.value(), nullptr, nullptr,
JSPROP_ENUMERATE);
}
// ES8 rev 0c1bd3004329336774cbc90de727cd0cf5f11e93 9.5.5 Proxy.[[GetOwnProperty]](P)
bool
ScriptedProxyHandler::getOwnPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
MutableHandle<PropertyDescriptor> desc) const
{
// Steps 2-4.
RootedObject handler(cx, ScriptedProxyHandler::handlerObject(proxy));
if (!handler) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_PROXY_REVOKED);
return false;
}
// Step 5.
RootedObject target(cx, proxy->as<ProxyObject>().target());
MOZ_ASSERT(target);
// Step 6.
RootedValue trap(cx);
if (!GetProxyTrap(cx, handler, cx->names().getOwnPropertyDescriptor, &trap))
return false;
// Step 7.
if (trap.isUndefined())
return GetOwnPropertyDescriptor(cx, target, id, desc);
// Step 8.
RootedValue propKey(cx);
if (!IdToStringOrSymbol(cx, id, &propKey))
return false;
RootedValue trapResult(cx);
RootedValue targetVal(cx, ObjectValue(*target));
if (!Call(cx, trap, handler, targetVal, propKey, &trapResult))
return false;
// Step 9.
if (!trapResult.isUndefined() && !trapResult.isObject())
return js::Throw(cx, id, JSMSG_PROXY_GETOWN_OBJORUNDEF);
// Step 10.
Rooted<PropertyDescriptor> targetDesc(cx);
if (!GetOwnPropertyDescriptor(cx, target, id, &targetDesc))
return false;
// Step 11.
if (trapResult.isUndefined()) {
// Step 11a.
if (!targetDesc.object()) {
desc.object().set(nullptr);
return true;
}
// Step 11b.
if (!targetDesc.configurable())
return js::Throw(cx, id, JSMSG_CANT_REPORT_NC_AS_NE);
// Steps 11c-d.
bool extensibleTarget;
if (!IsExtensible(cx, target, &extensibleTarget))
return false;
// Step 11e.
if (!extensibleTarget)
return js::Throw(cx, id, JSMSG_CANT_REPORT_E_AS_NE);
// Step 11f.
desc.object().set(nullptr);
return true;
}
// Step 12.
bool extensibleTarget;
if (!IsExtensible(cx, target, &extensibleTarget))
return false;
// Step 13.
Rooted<PropertyDescriptor> resultDesc(cx);
if (!ToPropertyDescriptor(cx, trapResult, true, &resultDesc))
return false;
// Step 14.
CompletePropertyDescriptor(&resultDesc);
// Step 15.
const char* errorDetails = nullptr;
if (!IsCompatiblePropertyDescriptor(cx, extensibleTarget, resultDesc, targetDesc,
&errorDetails))
return false;
// Step 16.
if (errorDetails)
return js::Throw(cx, id, JSMSG_CANT_REPORT_INVALID, errorDetails);
// Step 17.
if (!resultDesc.configurable()) {
if (!targetDesc.object())
return js::Throw(cx, id, JSMSG_CANT_REPORT_NE_AS_NC);
if (targetDesc.configurable())
return js::Throw(cx, id, JSMSG_CANT_REPORT_C_AS_NC);
}
// Step 18.
desc.set(resultDesc);
desc.object().set(proxy);
return true;
}
