Add m-esr52 at 52.6.0

1 files changed, 390 insertions, 0 deletions

diff --git a/js/src/builtin/WeakMapObject.cpp b/js/src/builtin/WeakMapObject.cpp
new file mode 100644
index 000000000..555b9e03a
--- /dev/null
+++ b/js/src/builtin/WeakMapObject.cpp
@@ -0,0 +1,390 @@
+/* -*- 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/SelfHosting.h"
+
+#include "vm/Interpreter-inl.h"
+
+using namespace js;
+using namespace js::gc;
+
+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_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()->isWrappedNative() ||
+        obj->getClass()->isDOMClass() ||
+        (obj->is<ProxyObject>() &&
+         obj->as<ProxyObject>().handler()->family() == GetDOMProxyHandlerFamily()))
+    {
+        MOZ_ASSERT(cx->runtime()->preserveWrapperCallback);
+        if (!cx->runtime()->preserveWrapperCallback(cx, obj)) {
+            JS_ReportErrorNumberASCII(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) {
+        auto 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()->extWeakmapKeyDelegateOp()) {
+        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()) {
+        UniqueChars bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, args.get(0), nullptr);
+        if (!bytes)
+            return false;
+        JS_ReportErrorNumberLatin1(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)
+{
+    MOZ_ASSERT(fop->maybeOffMainThread());
+    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()) {
+        FixedInvokeArgs<1> args2(cx);
+        args2[0].set(args[0]);
+
+        RootedValue thisv(cx, ObjectValue(*obj));
+        if (!CallSelfHostedFunction(cx, cx->names().WeakMapConstructorInit, thisv, args2, args2.rval()))
+            return false;
+    }
+
+    args.rval().setObject(*obj);
+    return true;
+}
+
+static const ClassOps WeakMapObjectClassOps = {
+    nullptr, /* addProperty */
+    nullptr, /* delProperty */
+    nullptr, /* getProperty */
+    nullptr, /* setProperty */
+    nullptr, /* enumerate */
+    nullptr, /* resolve */
+    nullptr, /* mayResolve */
+    WeakMap_finalize,
+    nullptr, /* call */
+    nullptr, /* hasInstance */
+    nullptr, /* construct */
+    WeakMap_mark
+};
+
+const Class WeakMapObject::class_ = {
+    "WeakMap",
+    JSCLASS_HAS_PRIVATE |
+    JSCLASS_HAS_CACHED_PROTO(JSProto_WeakMap) |
+    JSCLASS_BACKGROUND_FINALIZE,
+    &WeakMapObjectClassOps
+};
+
+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_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 (!DefineToStringTag(cx, proto, cx->names().WeakMap))
+            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);
+}
+