1 files changed, 170 insertions, 0 deletions
diff --git a/js/src/builtin/WeakSetObject.cpp b/js/src/builtin/WeakSetObject.cpp
new file mode 100644
index 000000000..7ea3f2fef
--- /dev/null
+++ b/js/src/builtin/WeakSetObject.cpp
@@ -0,0 +1,170 @@
+/* -*- 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/WeakSetObject.h"
+
+#include "jsapi.h"
+#include "jscntxt.h"
+#include "jsiter.h"
+
+#include "builtin/MapObject.h"
+#include "builtin/SelfHostingDefines.h"
+#include "builtin/WeakMapObject.h"
+#include "vm/GlobalObject.h"
+#include "vm/SelfHosting.h"
+
+#include "jsobjinlines.h"
+
+#include "vm/Interpreter-inl.h"
+#include "vm/NativeObject-inl.h"
+
+using namespace js;
+
+const Class WeakSetObject::class_ = {
+    "WeakSet",
+    JSCLASS_HAS_CACHED_PROTO(JSProto_WeakSet) |
+    JSCLASS_HAS_RESERVED_SLOTS(WeakSetObject::RESERVED_SLOTS)
+};
+
+const JSPropertySpec WeakSetObject::properties[] = {
+    JS_PS_END
+};
+
+const JSFunctionSpec WeakSetObject::methods[] = {
+    JS_SELF_HOSTED_FN("add",    "WeakSet_add",    1, 0),
+    JS_SELF_HOSTED_FN("delete", "WeakSet_delete", 1, 0),
+    JS_SELF_HOSTED_FN("has",    "WeakSet_has",    1, 0),
+    JS_FS_END
+};
+
+JSObject*
+WeakSetObject::initClass(JSContext* cx, JSObject* obj)
+{
+    Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
+    RootedPlainObject proto(cx, NewBuiltinClassInstance<PlainObject>(cx));
+    if (!proto)
+        return nullptr;
+
+    Rooted<JSFunction*> ctor(cx, global->createConstructor(cx, construct, ClassName(JSProto_WeakSet, cx), 0));
+    if (!ctor ||
+        !LinkConstructorAndPrototype(cx, ctor, proto) ||
+        !DefinePropertiesAndFunctions(cx, proto, properties, methods) ||
+        !DefineToStringTag(cx, proto, cx->names().WeakSet) ||
+        !GlobalObject::initBuiltinConstructor(cx, global, JSProto_WeakSet, ctor, proto))
+    {
+        return nullptr;
+    }
+    return proto;
+}
+
+WeakSetObject*
+WeakSetObject::create(JSContext* cx, HandleObject proto /* = nullptr */)
+{
+    RootedObject map(cx, NewBuiltinClassInstance<WeakMapObject>(cx));
+    if (!map)
+        return nullptr;
+
+    WeakSetObject* obj = NewObjectWithClassProto<WeakSetObject>(cx, proto);
+    if (!obj)
+        return nullptr;
+
+    obj->setReservedSlot(WEAKSET_MAP_SLOT, ObjectValue(*map));
+    return obj;
+}
+
+bool
+WeakSetObject::isBuiltinAdd(HandleValue add, JSContext* cx)
+{
+    JSFunction* addFn;
+    return IsFunctionObject(add, &addFn) && IsSelfHostedFunctionWithName(addFn, cx->names().WeakSet_add);
+}
+
+bool
+WeakSetObject::construct(JSContext* cx, unsigned argc, Value* vp)
+{
+    // Based on our "Set" implementation instead of the more general ES6 steps.
+    CallArgs args = CallArgsFromVp(argc, vp);
+
+    if (!ThrowIfNotConstructing(cx, args, "WeakSet"))
+        return false;
+
+    RootedObject proto(cx);
+    RootedObject newTarget(cx, &args.newTarget().toObject());
+    if (!GetPrototypeFromConstructor(cx, newTarget, &proto))
+        return false;
+
+    Rooted<WeakSetObject*> obj(cx, WeakSetObject::create(cx, proto));
+    if (!obj)
+        return false;
+
+    if (!args.get(0).isNullOrUndefined()) {
+        RootedValue iterable(cx, args[0]);
+        bool optimized = false;
+        if (!IsOptimizableInitForSet<GlobalObject::getOrCreateWeakSetPrototype, isBuiltinAdd>(cx, obj, iterable, &optimized))
+            return false;
+
+        if (optimized) {
+            RootedValue keyVal(cx);
+            RootedObject keyObject(cx);
+            RootedValue placeholder(cx, BooleanValue(true));
+            RootedObject map(cx, &obj->getReservedSlot(WEAKSET_MAP_SLOT).toObject());
+            RootedArrayObject array(cx, &iterable.toObject().as<ArrayObject>());
+            for (uint32_t index = 0; index < array->getDenseInitializedLength(); ++index) {
+                keyVal.set(array->getDenseElement(index));
+                MOZ_ASSERT(!keyVal.isMagic(JS_ELEMENTS_HOLE));
+
+                if (keyVal.isPrimitive()) {
+                    UniqueChars bytes =
+                        DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, keyVal, nullptr);
+                    if (!bytes)
+                        return false;
+                    JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr,
+                                               JSMSG_NOT_NONNULL_OBJECT, bytes.get());
+                    return false;
+                }
+
+                keyObject = &keyVal.toObject();
+                if (!SetWeakMapEntry(cx, map, keyObject, placeholder))
+                    return false;
+            }
+        } else {
+            FixedInvokeArgs<1> args2(cx);
+            args2[0].set(args[0]);
+
+            RootedValue thisv(cx, ObjectValue(*obj));
+            if (!CallSelfHostedFunction(cx, cx->names().WeakSetConstructorInit, thisv, args2, args2.rval()))
+                return false;
+        }
+    }
+
+    args.rval().setObject(*obj);
+    return true;
+}
+
+
+JSObject*
+js::InitWeakSetClass(JSContext* cx, HandleObject obj)
+{
+    return WeakSetObject::initClass(cx, obj);
+}
+
+JS_FRIEND_API(bool)
+JS_NondeterministicGetWeakSetKeys(JSContext* cx, HandleObject objArg, MutableHandleObject ret)
+{
+    RootedObject obj(cx, objArg);
+    obj = UncheckedUnwrap(obj);
+    if (!obj || !obj->is<WeakSetObject>()) {
+        ret.set(nullptr);
+        return true;
+    }
+
+    Rooted<WeakSetObject*> weakset(cx, &obj->as<WeakSetObject>());
+    if (!weakset)
+        return false;
+
+    RootedObject map(cx, &weakset->getReservedSlot(WEAKSET_MAP_SLOT).toObject());
+    return JS_NondeterministicGetWeakMapKeys(cx, map, ret);
+}