1 files changed, 237 insertions, 0 deletions
diff --git a/js/src/builtin/WeakSetObject.cpp b/js/src/builtin/WeakSetObject.cpp
new file mode 100644
index 0000000000..fe71183d85
--- /dev/null
+++ b/js/src/builtin/WeakSetObject.cpp
@@ -0,0 +1,237 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * 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 "builtin/MapObject.h"
+#include "js/friend/ErrorMessages.h"  // JSMSG_*
+#include "js/PropertySpec.h"
+#include "vm/GlobalObject.h"
+#include "vm/JSContext.h"
+#include "vm/SelfHosting.h"
+
+#include "builtin/WeakMapObject-inl.h"
+#include "vm/JSObject-inl.h"
+#include "vm/NativeObject-inl.h"
+
+using namespace js;
+
+/* static */ MOZ_ALWAYS_INLINE bool WeakSetObject::is(HandleValue v) {
+  return v.isObject() && v.toObject().is<WeakSetObject>();
+}
+
+// ES2018 draft rev 7a2d3f053ecc2336fc19f377c55d52d78b11b296
+// 23.4.3.1 WeakSet.prototype.add ( value )
+/* static */ MOZ_ALWAYS_INLINE bool WeakSetObject::add_impl(
+    JSContext* cx, const CallArgs& args) {
+  MOZ_ASSERT(is(args.thisv()));
+
+  // Step 4.
+  if (!args.get(0).isObject()) {
+    ReportNotObject(cx, JSMSG_OBJECT_REQUIRED_WEAKSET_VAL, args.get(0));
+    return false;
+  }
+
+  // Steps 5-7.
+  RootedObject value(cx, &args[0].toObject());
+  Rooted<WeakSetObject*> map(cx, &args.thisv().toObject().as<WeakSetObject>());
+  if (!WeakCollectionPutEntryInternal(cx, map, value, TrueHandleValue)) {
+    return false;
+  }
+
+  // Steps 6.a.i, 8.
+  args.rval().set(args.thisv());
+  return true;
+}
+
+/* static */
+bool WeakSetObject::add(JSContext* cx, unsigned argc, Value* vp) {
+  // Steps 1-3.
+  CallArgs args = CallArgsFromVp(argc, vp);
+  return CallNonGenericMethod<WeakSetObject::is, WeakSetObject::add_impl>(cx,
+                                                                          args);
+}
+
+// ES2018 draft rev 7a2d3f053ecc2336fc19f377c55d52d78b11b296
+// 23.4.3.3 WeakSet.prototype.delete ( value )
+/* static */ MOZ_ALWAYS_INLINE bool WeakSetObject::delete_impl(
+    JSContext* cx, const CallArgs& args) {
+  MOZ_ASSERT(is(args.thisv()));
+
+  // Step 4.
+  if (!args.get(0).isObject()) {
+    args.rval().setBoolean(false);
+    return true;
+  }
+
+  // Steps 5-6.
+  if (ObjectValueWeakMap* map =
+          args.thisv().toObject().as<WeakSetObject>().getMap()) {
+    JSObject* value = &args[0].toObject();
+    if (ObjectValueWeakMap::Ptr ptr = map->lookup(value)) {
+      map->remove(ptr);
+      args.rval().setBoolean(true);
+      return true;
+    }
+  }
+
+  // Step 7.
+  args.rval().setBoolean(false);
+  return true;
+}
+
+/* static */
+bool WeakSetObject::delete_(JSContext* cx, unsigned argc, Value* vp) {
+  // Steps 1-3.
+  CallArgs args = CallArgsFromVp(argc, vp);
+  return CallNonGenericMethod<WeakSetObject::is, WeakSetObject::delete_impl>(
+      cx, args);
+}
+
+// ES2018 draft rev 7a2d3f053ecc2336fc19f377c55d52d78b11b296
+// 23.4.3.4 WeakSet.prototype.has ( value )
+/* static */ MOZ_ALWAYS_INLINE bool WeakSetObject::has_impl(
+    JSContext* cx, const CallArgs& args) {
+  MOZ_ASSERT(is(args.thisv()));
+
+  // Step 5.
+  if (!args.get(0).isObject()) {
+    args.rval().setBoolean(false);
+    return true;
+  }
+
+  // Steps 4, 6.
+  if (ObjectValueWeakMap* map =
+          args.thisv().toObject().as<WeakSetObject>().getMap()) {
+    JSObject* value = &args[0].toObject();
+    if (map->has(value)) {
+      args.rval().setBoolean(true);
+      return true;
+    }
+  }
+
+  // Step 7.
+  args.rval().setBoolean(false);
+  return true;
+}
+
+/* static */
+bool WeakSetObject::has(JSContext* cx, unsigned argc, Value* vp) {
+  // Steps 1-3.
+  CallArgs args = CallArgsFromVp(argc, vp);
+  return CallNonGenericMethod<WeakSetObject::is, WeakSetObject::has_impl>(cx,
+                                                                          args);
+}
+
+const ClassSpec WeakSetObject::classSpec_ = {
+    GenericCreateConstructor<WeakSetObject::construct, 0,
+                             gc::AllocKind::FUNCTION>,
+    GenericCreatePrototype<WeakSetObject>,
+    nullptr,
+    nullptr,
+    WeakSetObject::methods,
+    WeakSetObject::properties,
+};
+
+const JSClass WeakSetObject::class_ = {
+    "WeakSet",
+    JSCLASS_HAS_RESERVED_SLOTS(SlotCount) |
+        JSCLASS_HAS_CACHED_PROTO(JSProto_WeakSet) | JSCLASS_BACKGROUND_FINALIZE,
+    &WeakCollectionObject::classOps_, &WeakSetObject::classSpec_};
+
+const JSClass WeakSetObject::protoClass_ = {
+    "WeakSet.prototype", JSCLASS_HAS_CACHED_PROTO(JSProto_WeakSet),
+    JS_NULL_CLASS_OPS, &WeakSetObject::classSpec_};
+
+const JSPropertySpec WeakSetObject::properties[] = {
+    JS_STRING_SYM_PS(toStringTag, "WeakSet", JSPROP_READONLY), JS_PS_END};
+
+const JSFunctionSpec WeakSetObject::methods[] = {
+    JS_FN("add", add, 1, 0), JS_FN("delete", delete_, 1, 0),
+    JS_FN("has", has, 1, 0), JS_FS_END};
+
+WeakSetObject* WeakSetObject::create(JSContext* cx,
+                                     HandleObject proto /* = nullptr */) {
+  return NewObjectWithClassProto<WeakSetObject>(cx, proto);
+}
+
+bool WeakSetObject::isBuiltinAdd(HandleValue add) {
+  return IsNativeFunction(add, WeakSetObject::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);
+  if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_WeakSet, &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);
+      Rooted<ArrayObject*> 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()) {
+          ReportNotObject(cx, JSMSG_OBJECT_REQUIRED_WEAKSET_VAL, keyVal);
+          return false;
+        }
+
+        keyObject = &keyVal.toObject();
+        if (!WeakCollectionPutEntryInternal(cx, obj, keyObject,
+                                            TrueHandleValue)) {
+          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;
+}
+
+JS_PUBLIC_API bool JS_NondeterministicGetWeakSetKeys(JSContext* cx,
+                                                     HandleObject objArg,
+                                                     MutableHandleObject ret) {
+  RootedObject obj(cx, UncheckedUnwrap(objArg));
+  if (!obj || !obj->is<WeakSetObject>()) {
+    ret.set(nullptr);
+    return true;
+  }
+  return WeakCollectionObject::nondeterministicGetKeys(
+      cx, obj.as<WeakCollectionObject>(), ret);
+}