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
InterposeProperty(JSContext* cx, HandleObject target, const nsIID* iid, HandleId id,
MutableHandle<JSPropertyDescriptor> descriptor)
{
// We only want to do interpostion on DOM instances and
// wrapped natives.
RootedObject unwrapped(cx, UncheckedUnwrap(target));
const js::Class* clasp = js::GetObjectClass(unwrapped);
if (!mozilla::dom::IsDOMClass(clasp) &&
!IS_WN_CLASS(clasp) &&
!IS_PROTO_CLASS(clasp) &&
clasp != &OuterWindowProxyClass) {
return true;
}
XPCWrappedNativeScope* scope = ObjectScope(CurrentGlobalOrNull(cx));
MOZ_ASSERT(scope->HasInterposition());
nsCOMPtr<nsIAddonInterposition> interp = scope->GetInterposition();
JSAddonId* addonId = AddonIdOfObject(target);
RootedValue addonIdValue(cx, StringValue(StringOfAddonId(addonId)));
RootedValue prop(cx, IdToValue(id));
RootedValue targetValue(cx, ObjectValue(*target));
RootedValue descriptorVal(cx);
nsresult rv = interp->InterposeProperty(addonIdValue, targetValue,
iid, prop, &descriptorVal);
if (NS_FAILED(rv)) {
xpc::Throw(cx, rv);
return false;
}
if (!descriptorVal.isObject())
return true;
// We need to be careful parsing descriptorVal. |cx| is in the compartment
// of the add-on and the descriptor is in the compartment of the
// interposition. We could wrap the descriptor in the add-on's compartment
// and then parse it. However, parsing the descriptor fetches properties
// from it, and we would try to interpose on those property accesses. So
// instead we parse in the interposition's compartment and then wrap the
// descriptor.
{
JSAutoCompartment ac(cx, &descriptorVal.toObject());
if (!JS::ObjectToCompletePropertyDescriptor(cx, target, descriptorVal, descriptor))
return false;
}
// Always make the property non-configurable regardless of what the
// interposition wants.
descriptor.setAttributes(descriptor.attributes() | JSPROP_PERMANENT);
if (!JS_WrapPropertyDescriptor(cx, descriptor))
return false;
return true;
}
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
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
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);
}
