| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: |
| * This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| #include "builtin/WeakMapObject.h" |
| |
| #include "jsapi.h" |
| #include "jscntxt.h" |
| |
| #include "vm/Interpreter-inl.h" |
| |
| using namespace js; |
| using namespace js::gc; |
| |
| using mozilla::UniquePtr; |
| |
| MOZ_ALWAYS_INLINE bool |
| IsWeakMap(HandleValue v) |
| { |
| return v.isObject() && v.toObject().is<WeakMapObject>(); |
| } |
| |
| MOZ_ALWAYS_INLINE bool |
| WeakMap_has_impl(JSContext* cx, const CallArgs& args) |
| { |
| MOZ_ASSERT(IsWeakMap(args.thisv())); |
| |
| if (!args.get(0).isObject()) { |
| args.rval().setBoolean(false); |
| return true; |
| } |
| |
| if (ObjectValueMap* map = args.thisv().toObject().as<WeakMapObject>().getMap()) { |
| JSObject* key = &args[0].toObject(); |
| if (map->has(key)) { |
| args.rval().setBoolean(true); |
| return true; |
| } |
| } |
| |
| args.rval().setBoolean(false); |
| return true; |
| } |
| |
| bool |
| js::WeakMap_has(JSContext* cx, unsigned argc, Value* vp) |
| { |
| CallArgs args = CallArgsFromVp(argc, vp); |
| return CallNonGenericMethod<IsWeakMap, WeakMap_has_impl>(cx, args); |
| } |
| |
| MOZ_ALWAYS_INLINE bool |
| WeakMap_clear_impl(JSContext* cx, const CallArgs& args) |
| { |
| MOZ_ASSERT(IsWeakMap(args.thisv())); |
| |
| // We can't js_delete the weakmap because the data gathered during GC is |
| // used by the Cycle Collector. |
| if (ObjectValueMap* map = args.thisv().toObject().as<WeakMapObject>().getMap()) |
| map->clear(); |
| |
| args.rval().setUndefined(); |
| return true; |
| } |
| |
| bool |
| js::WeakMap_clear(JSContext* cx, unsigned argc, Value* vp) |
| { |
| CallArgs args = CallArgsFromVp(argc, vp); |
| return CallNonGenericMethod<IsWeakMap, WeakMap_clear_impl>(cx, args); |
| } |
| |
| MOZ_ALWAYS_INLINE bool |
| WeakMap_get_impl(JSContext* cx, const CallArgs& args) |
| { |
| MOZ_ASSERT(IsWeakMap(args.thisv())); |
| |
| if (!args.get(0).isObject()) { |
| args.rval().setUndefined(); |
| return true; |
| } |
| |
| if (ObjectValueMap* map = args.thisv().toObject().as<WeakMapObject>().getMap()) { |
| JSObject* key = &args[0].toObject(); |
| if (ObjectValueMap::Ptr ptr = map->lookup(key)) { |
| args.rval().set(ptr->value()); |
| return true; |
| } |
| } |
| |
| args.rval().setUndefined(); |
| return true; |
| } |
| |
| bool |
| js::WeakMap_get(JSContext* cx, unsigned argc, Value* vp) |
| { |
| CallArgs args = CallArgsFromVp(argc, vp); |
| return CallNonGenericMethod<IsWeakMap, WeakMap_get_impl>(cx, args); |
| } |
| |
| MOZ_ALWAYS_INLINE bool |
| WeakMap_delete_impl(JSContext* cx, const CallArgs& args) |
| { |
| MOZ_ASSERT(IsWeakMap(args.thisv())); |
| |
| if (!args.get(0).isObject()) { |
| args.rval().setBoolean(false); |
| return true; |
| } |
| |
| if (ObjectValueMap* map = args.thisv().toObject().as<WeakMapObject>().getMap()) { |
| JSObject* key = &args[0].toObject(); |
| if (ObjectValueMap::Ptr ptr = map->lookup(key)) { |
| map->remove(ptr); |
| args.rval().setBoolean(true); |
| return true; |
| } |
| } |
| |
| args.rval().setBoolean(false); |
| return true; |
| } |
| |
| bool |
| js::WeakMap_delete(JSContext* cx, unsigned argc, Value* vp) |
| { |
| CallArgs args = CallArgsFromVp(argc, vp); |
| return CallNonGenericMethod<IsWeakMap, WeakMap_delete_impl>(cx, args); |
| } |
| |
| static bool |
| TryPreserveReflector(JSContext* cx, HandleObject obj) |
| { |
| if (obj->getClass()->ext.isWrappedNative || |
| (obj->getClass()->flags & JSCLASS_IS_DOMJSCLASS) || |
| (obj->is<ProxyObject>() && |
| obj->as<ProxyObject>().handler()->family() == GetDOMProxyHandlerFamily())) |
| { |
| MOZ_ASSERT(cx->runtime()->preserveWrapperCallback); |
| if (!cx->runtime()->preserveWrapperCallback(cx, obj)) { |
| JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_BAD_WEAKMAP_KEY); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| static MOZ_ALWAYS_INLINE bool |
| SetWeakMapEntryInternal(JSContext* cx, Handle<WeakMapObject*> mapObj, |
| HandleObject key, HandleValue value) |
| { |
| ObjectValueMap* map = mapObj->getMap(); |
| if (!map) { |
| AutoInitGCManagedObject<ObjectValueMap> newMap( |
| cx->make_unique<ObjectValueMap>(cx, mapObj.get())); |
| if (!newMap) |
| return false; |
| if (!newMap->init()) { |
| JS_ReportOutOfMemory(cx); |
| return false; |
| } |
| map = newMap.release(); |
| mapObj->setPrivate(map); |
| } |
| |
| // Preserve wrapped native keys to prevent wrapper optimization. |
| if (!TryPreserveReflector(cx, key)) |
| return false; |
| |
| if (JSWeakmapKeyDelegateOp op = key->getClass()->ext.weakmapKeyDelegateOp) { |
| RootedObject delegate(cx, op(key)); |
| if (delegate && !TryPreserveReflector(cx, delegate)) |
| return false; |
| } |
| |
| MOZ_ASSERT(key->compartment() == mapObj->compartment()); |
| MOZ_ASSERT_IF(value.isObject(), value.toObject().compartment() == mapObj->compartment()); |
| if (!map->put(key, value)) { |
| JS_ReportOutOfMemory(cx); |
| return false; |
| } |
| return true; |
| } |
| |
| MOZ_ALWAYS_INLINE bool |
| WeakMap_set_impl(JSContext* cx, const CallArgs& args) |
| { |
| MOZ_ASSERT(IsWeakMap(args.thisv())); |
| |
| if (!args.get(0).isObject()) { |
| UniquePtr<char[], JS::FreePolicy> bytes = |
| DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, args.get(0), nullptr); |
| if (!bytes) |
| return false; |
| JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT, bytes.get()); |
| return false; |
| } |
| |
| RootedObject key(cx, &args[0].toObject()); |
| Rooted<JSObject*> thisObj(cx, &args.thisv().toObject()); |
| Rooted<WeakMapObject*> map(cx, &thisObj->as<WeakMapObject>()); |
| |
| if (!SetWeakMapEntryInternal(cx, map, key, args.get(1))) |
| return false; |
| args.rval().set(args.thisv()); |
| return true; |
| } |
| |
| bool |
| js::WeakMap_set(JSContext* cx, unsigned argc, Value* vp) |
| { |
| CallArgs args = CallArgsFromVp(argc, vp); |
| return CallNonGenericMethod<IsWeakMap, WeakMap_set_impl>(cx, args); |
| } |
| |
| JS_FRIEND_API(bool) |
| JS_NondeterministicGetWeakMapKeys(JSContext* cx, HandleObject objArg, MutableHandleObject ret) |
| { |
| RootedObject obj(cx, objArg); |
| obj = UncheckedUnwrap(obj); |
| if (!obj || !obj->is<WeakMapObject>()) { |
| ret.set(nullptr); |
| return true; |
| } |
| RootedObject arr(cx, NewDenseEmptyArray(cx)); |
| if (!arr) |
| return false; |
| ObjectValueMap* map = obj->as<WeakMapObject>().getMap(); |
| if (map) { |
| // Prevent GC from mutating the weakmap while iterating. |
| AutoSuppressGC suppress(cx); |
| for (ObjectValueMap::Base::Range r = map->all(); !r.empty(); r.popFront()) { |
| JS::ExposeObjectToActiveJS(r.front().key()); |
| RootedObject key(cx, r.front().key()); |
| if (!cx->compartment()->wrap(cx, &key)) |
| return false; |
| if (!NewbornArrayPush(cx, arr, ObjectValue(*key))) |
| return false; |
| } |
| } |
| ret.set(arr); |
| return true; |
| } |
| |
| static void |
| WeakMap_mark(JSTracer* trc, JSObject* obj) |
| { |
| if (ObjectValueMap* map = obj->as<WeakMapObject>().getMap()) |
| map->trace(trc); |
| } |
| |
| static void |
| WeakMap_finalize(FreeOp* fop, JSObject* obj) |
| { |
| if (ObjectValueMap* map = obj->as<WeakMapObject>().getMap()) { |
| #ifdef DEBUG |
| map->~ObjectValueMap(); |
| memset(static_cast<void*>(map), 0xdc, sizeof(*map)); |
| fop->free_(map); |
| #else |
| fop->delete_(map); |
| #endif |
| } |
| } |
| |
| JS_PUBLIC_API(JSObject*) |
| JS::NewWeakMapObject(JSContext* cx) |
| { |
| return NewBuiltinClassInstance(cx, &WeakMapObject::class_); |
| } |
| |
| JS_PUBLIC_API(bool) |
| JS::IsWeakMapObject(JSObject* obj) |
| { |
| return obj->is<WeakMapObject>(); |
| } |
| |
| JS_PUBLIC_API(bool) |
| JS::GetWeakMapEntry(JSContext* cx, HandleObject mapObj, HandleObject key, |
| MutableHandleValue rval) |
| { |
| CHECK_REQUEST(cx); |
| assertSameCompartment(cx, key); |
| rval.setUndefined(); |
| ObjectValueMap* map = mapObj->as<WeakMapObject>().getMap(); |
| if (!map) |
| return true; |
| if (ObjectValueMap::Ptr ptr = map->lookup(key)) { |
| // Read barrier to prevent an incorrectly gray value from escaping the |
| // weak map. See the comment before UnmarkGrayChildren in gc/Marking.cpp |
| ExposeValueToActiveJS(ptr->value().get()); |
| rval.set(ptr->value()); |
| } |
| return true; |
| } |
| |
| JS_PUBLIC_API(bool) |
| JS::SetWeakMapEntry(JSContext* cx, HandleObject mapObj, HandleObject key, |
| HandleValue val) |
| { |
| CHECK_REQUEST(cx); |
| assertSameCompartment(cx, key, val); |
| Rooted<WeakMapObject*> rootedMap(cx, &mapObj->as<WeakMapObject>()); |
| return SetWeakMapEntryInternal(cx, rootedMap, key, val); |
| } |
| |
| static bool |
| WeakMap_construct(JSContext* cx, unsigned argc, Value* vp) |
| { |
| CallArgs args = CallArgsFromVp(argc, vp); |
| |
| // ES6 draft rev 31 (15 Jan 2015) 23.3.1.1 step 1. |
| if (!ThrowIfNotConstructing(cx, args, "WeakMap")) |
| return false; |
| |
| RootedObject newTarget(cx, &args.newTarget().toObject()); |
| RootedObject obj(cx, CreateThis(cx, &WeakMapObject::class_, newTarget)); |
| if (!obj) |
| return false; |
| |
| // Steps 5-6, 11. |
| if (!args.get(0).isNullOrUndefined()) { |
| // Steps 7a-b. |
| RootedValue adderVal(cx); |
| if (!GetProperty(cx, obj, obj, cx->names().set, &adderVal)) |
| return false; |
| |
| // Step 7c. |
| if (!IsCallable(adderVal)) |
| return ReportIsNotFunction(cx, adderVal); |
| |
| bool isOriginalAdder = IsNativeFunction(adderVal, WeakMap_set); |
| RootedValue mapVal(cx, ObjectValue(*obj)); |
| FastInvokeGuard fig(cx, adderVal); |
| InvokeArgs& args2 = fig.args(); |
| |
| // Steps 7d-e. |
| JS::ForOfIterator iter(cx); |
| if (!iter.init(args[0])) |
| return false; |
| |
| RootedValue pairVal(cx); |
| RootedObject pairObject(cx); |
| RootedValue keyVal(cx); |
| RootedObject keyObject(cx); |
| RootedValue val(cx); |
| while (true) { |
| // Steps 12a-e. |
| bool done; |
| if (!iter.next(&pairVal, &done)) |
| return false; |
| if (done) |
| break; |
| |
| // Step 12f. |
| if (!pairVal.isObject()) { |
| JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, |
| JSMSG_INVALID_MAP_ITERABLE, "WeakMap"); |
| return false; |
| } |
| |
| pairObject = &pairVal.toObject(); |
| if (!pairObject) |
| return false; |
| |
| // Steps 12g-h. |
| if (!GetElement(cx, pairObject, pairObject, 0, &keyVal)) |
| return false; |
| |
| // Steps 12i-j. |
| if (!GetElement(cx, pairObject, pairObject, 1, &val)) |
| return false; |
| |
| // Steps 12k-l. |
| if (isOriginalAdder) { |
| if (keyVal.isPrimitive()) { |
| UniquePtr<char[], JS::FreePolicy> bytes = |
| DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, keyVal, nullptr); |
| if (!bytes) |
| return false; |
| JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT, bytes.get()); |
| return false; |
| } |
| |
| keyObject = &keyVal.toObject(); |
| if (!SetWeakMapEntry(cx, obj, keyObject, val)) |
| return false; |
| } else { |
| if (!args2.init(2)) |
| return false; |
| |
| args2.setCallee(adderVal); |
| args2.setThis(mapVal); |
| args2[0].set(keyVal); |
| args2[1].set(val); |
| |
| if (!fig.invoke(cx)) |
| return false; |
| } |
| } |
| } |
| |
| args.rval().setObject(*obj); |
| return true; |
| } |
| |
| const Class WeakMapObject::class_ = { |
| "WeakMap", |
| JSCLASS_HAS_PRIVATE | |
| JSCLASS_HAS_CACHED_PROTO(JSProto_WeakMap), |
| nullptr, /* addProperty */ |
| nullptr, /* delProperty */ |
| nullptr, /* getProperty */ |
| nullptr, /* setProperty */ |
| nullptr, /* enumerate */ |
| nullptr, /* resolve */ |
| nullptr, /* mayResolve */ |
| WeakMap_finalize, |
| nullptr, /* call */ |
| nullptr, /* hasInstance */ |
| nullptr, /* construct */ |
| WeakMap_mark |
| }; |
| |
| static const JSFunctionSpec weak_map_methods[] = { |
| JS_FN("has", WeakMap_has, 1, 0), |
| JS_FN("get", WeakMap_get, 1, 0), |
| JS_FN("delete", WeakMap_delete, 1, 0), |
| JS_FN("set", WeakMap_set, 2, 0), |
| JS_FN("clear", WeakMap_clear, 0, 0), |
| JS_FS_END |
| }; |
| |
| static JSObject* |
| InitWeakMapClass(JSContext* cx, HandleObject obj, bool defineMembers) |
| { |
| MOZ_ASSERT(obj->isNative()); |
| |
| Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>()); |
| |
| RootedPlainObject proto(cx, NewBuiltinClassInstance<PlainObject>(cx)); |
| if (!proto) |
| return nullptr; |
| |
| RootedFunction ctor(cx, global->createConstructor(cx, WeakMap_construct, |
| cx->names().WeakMap, 0)); |
| if (!ctor) |
| return nullptr; |
| |
| if (!LinkConstructorAndPrototype(cx, ctor, proto)) |
| return nullptr; |
| |
| if (defineMembers) { |
| if (!DefinePropertiesAndFunctions(cx, proto, nullptr, weak_map_methods)) |
| return nullptr; |
| } |
| |
| if (!GlobalObject::initBuiltinConstructor(cx, global, JSProto_WeakMap, ctor, proto)) |
| return nullptr; |
| return proto; |
| } |
| |
| JSObject* |
| js::InitWeakMapClass(JSContext* cx, HandleObject obj) |
| { |
| return InitWeakMapClass(cx, obj, true); |
| } |
| |
| JSObject* |
| js::InitBareWeakMapCtor(JSContext* cx, HandleObject obj) |
| { |
| return InitWeakMapClass(cx, obj, false); |
| } |
| |