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