michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=4 sw=4 et tw=80:
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "JavaScriptChild.h"
michael@0: #include "mozilla/dom/ContentChild.h"
michael@0: #include "mozilla/dom/BindingUtils.h"
michael@0: #include "nsContentUtils.h"
michael@0: #include "xpcprivate.h"
michael@0: #include "jsfriendapi.h"
michael@0: #include "nsCxPusher.h"
michael@0: 
michael@0: using namespace JS;
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::jsipc;
michael@0: 
michael@0: using mozilla::AutoSafeJSContext;
michael@0: 
michael@0: JavaScriptChild::JavaScriptChild(JSRuntime *rt)
michael@0:   : lastId_(0),
michael@0:     rt_(rt)
michael@0: {
michael@0: }
michael@0: 
michael@0: static void
michael@0: Trace(JSTracer *trc, void *data)
michael@0: {
michael@0:     reinterpret_cast<JavaScriptChild *>(data)->trace(trc);
michael@0: }
michael@0: 
michael@0: JavaScriptChild::~JavaScriptChild()
michael@0: {
michael@0:     JS_RemoveExtraGCRootsTracer(rt_, Trace, this);
michael@0: }
michael@0: 
michael@0: void
michael@0: JavaScriptChild::trace(JSTracer *trc)
michael@0: {
michael@0:     objects_.trace(trc);
michael@0:     ids_.trace(trc);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::init()
michael@0: {
michael@0:     if (!JavaScriptShared::init())
michael@0:         return false;
michael@0:     if (!ids_.init())
michael@0:         return false;
michael@0: 
michael@0:     JS_AddExtraGCRootsTracer(rt_, Trace, this);
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::RecvDropObject(const ObjectId &objId)
michael@0: {
michael@0:     JSObject *obj = findObject(objId);
michael@0:     if (obj) {
michael@0:         ids_.remove(obj);
michael@0:         objects_.remove(objId);
michael@0:     }
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::makeId(JSContext *cx, JSObject *obj, ObjectId *idp)
michael@0: {
michael@0:     if (!obj) {
michael@0:         *idp = 0;
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     ObjectId id = ids_.find(obj);
michael@0:     if (id) {
michael@0:         *idp = id;
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     id = ++lastId_;
michael@0:     if (id > MAX_CPOW_IDS) {
michael@0:         JS_ReportError(cx, "CPOW id limit reached");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     id <<= OBJECT_EXTRA_BITS;
michael@0:     if (JS_ObjectIsCallable(cx, obj))
michael@0:         id |= OBJECT_IS_CALLABLE;
michael@0: 
michael@0:     if (!objects_.add(id, obj))
michael@0:         return false;
michael@0:     if (!ids_.add(cx, obj, id))
michael@0:         return false;
michael@0: 
michael@0:     *idp = id;
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: JSObject *
michael@0: JavaScriptChild::unwrap(JSContext *cx, ObjectId id)
michael@0: {
michael@0:     JSObject *obj = findObject(id);
michael@0:     MOZ_ASSERT(obj);
michael@0:     return obj;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::fail(JSContext *cx, ReturnStatus *rs)
michael@0: {
michael@0:     // By default, we set |undefined| unless we can get a more meaningful
michael@0:     // exception.
michael@0:     *rs = ReturnStatus(ReturnException(JSVariant(void_t())));
michael@0: 
michael@0:     // Note we always return true from this function, since this propagates
michael@0:     // to the IPC code, and we don't want a JS failure to cause the death
michael@0:     // of the child process.
michael@0: 
michael@0:     RootedValue exn(cx);
michael@0:     if (!JS_GetPendingException(cx, &exn))
michael@0:         return true;
michael@0: 
michael@0:     // If we don't clear the pending exception, JS will try to wrap it as it
michael@0:     // leaves the current compartment. Since there is no previous compartment,
michael@0:     // that would crash.
michael@0:     JS_ClearPendingException(cx);
michael@0: 
michael@0:     if (JS_IsStopIteration(exn)) {
michael@0:         *rs = ReturnStatus(ReturnStopIteration());
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     // If this fails, we still don't want to exit. Just return an invalid
michael@0:     // exception.
michael@0:     (void) toVariant(cx, exn, &rs->get_ReturnException().exn());
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::ok(ReturnStatus *rs)
michael@0: {
michael@0:     *rs = ReturnStatus(ReturnSuccess());
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerPreventExtensions(const ObjectId &objId, ReturnStatus *rs)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0:     if (!JS_PreventExtensions(cx, obj))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: static void
michael@0: EmptyDesc(PPropertyDescriptor *desc)
michael@0: {
michael@0:     desc->objId() = 0;
michael@0:     desc->attrs() = 0;
michael@0:     desc->value() = void_t();
michael@0:     desc->getter() = 0;
michael@0:     desc->setter() = 0;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerGetPropertyDescriptor(const ObjectId &objId, const nsString &id,
michael@0:                                              ReturnStatus *rs, PPropertyDescriptor *out)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     EmptyDesc(out);
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     RootedId internedId(cx);
michael@0:     if (!convertGeckoStringToId(cx, id, &internedId))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     Rooted<JSPropertyDescriptor> desc(cx);
michael@0:     if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     if (!desc.object())
michael@0:         return ok(rs);
michael@0: 
michael@0:     if (!fromDescriptor(cx, desc, out))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerGetOwnPropertyDescriptor(const ObjectId &objId, const nsString &id,
michael@0:                                                 ReturnStatus *rs, PPropertyDescriptor *out)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     EmptyDesc(out);
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     RootedId internedId(cx);
michael@0:     if (!convertGeckoStringToId(cx, id, &internedId))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     Rooted<JSPropertyDescriptor> desc(cx);
michael@0:     if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     if (desc.object() != obj)
michael@0:         return ok(rs);
michael@0: 
michael@0:     if (!fromDescriptor(cx, desc, out))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerDefineProperty(const ObjectId &objId, const nsString &id,
michael@0:                                       const PPropertyDescriptor &descriptor, ReturnStatus *rs)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     RootedId internedId(cx);
michael@0:     if (!convertGeckoStringToId(cx, id, &internedId))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     Rooted<JSPropertyDescriptor> desc(cx);
michael@0:     if (!toDescriptor(cx, descriptor, &desc))
michael@0:         return false;
michael@0: 
michael@0:     if (!js::CheckDefineProperty(cx, obj, internedId, desc.value(), desc.getter(),
michael@0:                                  desc.setter(), desc.attributes()))
michael@0:     {
michael@0:         return fail(cx, rs);
michael@0:     }
michael@0: 
michael@0:     if (!JS_DefinePropertyById(cx, obj, internedId, desc.value(), desc.getter(),
michael@0:                                desc.setter(), desc.attributes()))
michael@0:     {
michael@0:         return fail(cx, rs);
michael@0:     }
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerDelete(const ObjectId &objId, const nsString &id, ReturnStatus *rs,
michael@0:                               bool *success)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     *success = false;
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     RootedId internedId(cx);
michael@0:     if (!convertGeckoStringToId(cx, id, &internedId))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     if (!JS_DeletePropertyById2(cx, obj, internedId, success))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerHas(const ObjectId &objId, const nsString &id, ReturnStatus *rs, bool *bp)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     *bp = false;
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     RootedId internedId(cx);
michael@0:     if (!convertGeckoStringToId(cx, id, &internedId))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     bool found;
michael@0:     if (!JS_HasPropertyById(cx, obj, internedId, &found))
michael@0:         return fail(cx, rs);
michael@0:     *bp = !!found;
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerHasOwn(const ObjectId &objId, const nsString &id, ReturnStatus *rs, bool *bp)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     *bp = false;
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     RootedId internedId(cx);
michael@0:     if (!convertGeckoStringToId(cx, id, &internedId))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     Rooted<JSPropertyDescriptor> desc(cx);
michael@0:     if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
michael@0:         return fail(cx, rs);
michael@0:     *bp = (desc.object() == obj);
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerGet(const ObjectId &objId, const ObjectId &receiverId, const nsString &id,
michael@0:                            ReturnStatus *rs, JSVariant *result)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     // The outparam will be written to the buffer, so it must be set even if
michael@0:     // the parent won't read it.
michael@0:     *result = void_t();
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     RootedObject receiver(cx, findObject(receiverId));
michael@0:     if (!receiver)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     RootedId internedId(cx);
michael@0:     if (!convertGeckoStringToId(cx, id, &internedId))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     JS::RootedValue val(cx);
michael@0:     if (!JS_ForwardGetPropertyTo(cx, obj, internedId, receiver, &val))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     if (!toVariant(cx, val, result))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerSet(const ObjectId &objId, const ObjectId &receiverId, const nsString &id,
michael@0:                            const bool &strict, const JSVariant &value, ReturnStatus *rs,
michael@0:                            JSVariant *result)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     // The outparam will be written to the buffer, so it must be set even if
michael@0:     // the parent won't read it.
michael@0:     *result = void_t();
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     RootedObject receiver(cx, findObject(receiverId));
michael@0:     if (!receiver)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     RootedId internedId(cx);
michael@0:     if (!convertGeckoStringToId(cx, id, &internedId))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     MOZ_ASSERT(obj == receiver);
michael@0: 
michael@0:     RootedValue val(cx);
michael@0:     if (!toValue(cx, value, &val))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     if (!JS_SetPropertyById(cx, obj, internedId, val))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     if (!toVariant(cx, val, result))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerIsExtensible(const ObjectId &objId, ReturnStatus *rs, bool *result)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     *result = false;
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     bool extensible;
michael@0:     if (!JS_IsExtensible(cx, obj, &extensible))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     *result = !!extensible;
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerCall(const ObjectId &objId, const nsTArray<JSParam> &argv, ReturnStatus *rs,
michael@0:                             JSVariant *result, nsTArray<JSParam> *outparams)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     // The outparam will be written to the buffer, so it must be set even if
michael@0:     // the parent won't read it.
michael@0:     *result = void_t();
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     MOZ_ASSERT(argv.Length() >= 2);
michael@0: 
michael@0:     RootedValue objv(cx);
michael@0:     if (!toValue(cx, argv[0], &objv))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     JSAutoCompartment comp(cx, &objv.toObject());
michael@0: 
michael@0:     *result = JSVariant(void_t());
michael@0: 
michael@0:     AutoValueVector vals(cx);
michael@0:     AutoValueVector outobjects(cx);
michael@0:     for (size_t i = 0; i < argv.Length(); i++) {
michael@0:         if (argv[i].type() == JSParam::Tvoid_t) {
michael@0:             // This is an outparam.
michael@0:             JSCompartment *compartment = js::GetContextCompartment(cx);
michael@0:             RootedObject global(cx, JS_GetGlobalForCompartmentOrNull(cx, compartment));
michael@0:             RootedObject obj(cx, xpc::NewOutObject(cx, global));
michael@0:             if (!obj)
michael@0:                 return fail(cx, rs);
michael@0:             if (!outobjects.append(ObjectValue(*obj)))
michael@0:                 return fail(cx, rs);
michael@0:             if (!vals.append(ObjectValue(*obj)))
michael@0:                 return fail(cx, rs);
michael@0:         } else {
michael@0:             RootedValue v(cx);
michael@0:             if (!toValue(cx, argv[i].get_JSVariant(), &v))
michael@0:                 return fail(cx, rs);
michael@0:             if (!vals.append(v))
michael@0:                 return fail(cx, rs);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     RootedValue rval(cx);
michael@0:     {
michael@0:         AutoSaveContextOptions asco(cx);
michael@0:         ContextOptionsRef(cx).setDontReportUncaught(true);
michael@0: 
michael@0:         HandleValueArray args = HandleValueArray::subarray(vals, 2, vals.length() - 2);
michael@0:         bool success = JS::Call(cx, vals.handleAt(1), vals.handleAt(0), args, &rval);
michael@0:         if (!success)
michael@0:             return fail(cx, rs);
michael@0:     }
michael@0: 
michael@0:     if (!toVariant(cx, rval, result))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     // Prefill everything with a dummy jsval.
michael@0:     for (size_t i = 0; i < outobjects.length(); i++)
michael@0:         outparams->AppendElement(JSParam(void_t()));
michael@0: 
michael@0:     // Go through each argument that was an outparam, retrieve the "value"
michael@0:     // field, and add it to a temporary list. We need to do this separately
michael@0:     // because the outparams vector is not rooted.
michael@0:     vals.clear();
michael@0:     for (size_t i = 0; i < outobjects.length(); i++) {
michael@0:         RootedObject obj(cx, &outobjects[i].toObject());
michael@0: 
michael@0:         RootedValue v(cx);
michael@0:         bool found;
michael@0:         if (JS_HasProperty(cx, obj, "value", &found)) {
michael@0:             if (!JS_GetProperty(cx, obj, "value", &v))
michael@0:                 return fail(cx, rs);
michael@0:         } else {
michael@0:             v = UndefinedValue();
michael@0:         }
michael@0:         if (!vals.append(v))
michael@0:             return fail(cx, rs);
michael@0:     }
michael@0: 
michael@0:     // Copy the outparams. If any outparam is already set to a void_t, we
michael@0:     // treat this as the outparam never having been set.
michael@0:     for (size_t i = 0; i < vals.length(); i++) {
michael@0:         JSVariant variant;
michael@0:         if (!toVariant(cx, vals.handleAt(i), &variant))
michael@0:             return fail(cx, rs);
michael@0:         outparams->ReplaceElementAt(i, JSParam(variant));
michael@0:     }
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerObjectClassIs(const ObjectId &objId, const uint32_t &classValue,
michael@0:                                      bool *result)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     *result = js_ObjectClassIs(cx, obj, (js::ESClassValue)classValue);
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerClassName(const ObjectId &objId, nsString *name)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     *name = NS_ConvertASCIItoUTF16(js_ObjectClassName(cx, obj));
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerGetPropertyNames(const ObjectId &objId, const uint32_t &flags,
michael@0:                                         ReturnStatus *rs, nsTArray<nsString> *names)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     AutoIdVector props(cx);
michael@0:     if (!js::GetPropertyNames(cx, obj, flags, &props))
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     for (size_t i = 0; i < props.length(); i++) {
michael@0:         nsString name;
michael@0:         if (!convertIdToGeckoString(cx, props.handleAt(i), &name))
michael@0:             return fail(cx, rs);
michael@0: 
michael@0:         names->AppendElement(name);
michael@0:     }
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerInstanceOf(const ObjectId &objId, const JSIID &iid, ReturnStatus *rs,
michael@0:                                   bool *instanceof)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     *instanceof = false;
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     nsID nsiid;
michael@0:     ConvertID(iid, &nsiid);
michael@0: 
michael@0:     nsresult rv = xpc::HasInstance(cx, obj, &nsiid, instanceof);
michael@0:     if (rv != NS_OK)
michael@0:         return fail(cx, rs);
michael@0: 
michael@0:     return ok(rs);
michael@0: }
michael@0: 
michael@0: bool
michael@0: JavaScriptChild::AnswerDOMInstanceOf(const ObjectId &objId, const int &prototypeID,
michael@0:                                      const int &depth,
michael@0:                                      ReturnStatus *rs, bool *instanceof)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoRequest request(cx);
michael@0: 
michael@0:     *instanceof = false;
michael@0: 
michael@0:     RootedObject obj(cx, findObject(objId));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     JSAutoCompartment comp(cx, obj);
michael@0: 
michael@0:     bool tmp;
michael@0:     if (!mozilla::dom::InterfaceHasInstance(cx, prototypeID, depth, obj, &tmp))
michael@0:         return fail(cx, rs);
michael@0:     *instanceof = tmp;
michael@0: 
michael@0:     return ok(rs);
michael@0: }