1 files changed, 77 insertions, 0 deletions
diff --git a/js/src/builtin/RecordObject.cpp b/js/src/builtin/RecordObject.cpp
new file mode 100644
index 0000000000..9b2f73d08e
--- /dev/null
+++ b/js/src/builtin/RecordObject.cpp
@@ -0,0 +1,77 @@
+/* -*- 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/RecordObject.h"
+
+#include "jsapi.h"
+
+#include "vm/ObjectOperations.h"
+#include "vm/RecordType.h"
+
+#include "vm/JSObject-inl.h"
+
+using namespace js;
+
+// Record and Record proposal section 9.2.1
+
+RecordObject* RecordObject::create(JSContext* cx, Handle<RecordType*> record) {
+  RecordObject* rec = NewBuiltinClassInstance<RecordObject>(cx);
+  if (!rec) {
+    return nullptr;
+  }
+  rec->setFixedSlot(PrimitiveValueSlot, ExtendedPrimitiveValue(*record));
+  return rec;
+}
+
+RecordType* RecordObject::unbox() const {
+  return &getFixedSlot(PrimitiveValueSlot)
+              .toExtendedPrimitive()
+              .as<RecordType>();
+}
+
+bool RecordObject::maybeUnbox(JSObject* obj, MutableHandle<RecordType*> rrec) {
+  if (obj->is<RecordType>()) {
+    rrec.set(&obj->as<RecordType>());
+    return true;
+  }
+  if (obj->is<RecordObject>()) {
+    rrec.set(obj->as<RecordObject>().unbox());
+    return true;
+  }
+  return false;
+}
+
+bool rec_resolve(JSContext* cx, HandleObject obj, HandleId id,
+                 bool* resolvedp) {
+  RootedValue value(cx);
+  *resolvedp = obj->as<RecordObject>().unbox()->getOwnProperty(cx, id, &value);
+
+  if (*resolvedp) {
+    static const unsigned RECORD_PROPERTY_ATTRS =
+        JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT;
+    return DefineDataProperty(cx, obj, id, value,
+                              RECORD_PROPERTY_ATTRS | JSPROP_RESOLVING);
+  }
+
+  return true;
+}
+
+static const JSClassOps RecordObjectClassOps = {
+    nullptr,      // addProperty
+    nullptr,      // delProperty
+    nullptr,      // enumerate
+    nullptr,      // newEnumerate
+    rec_resolve,  // resolve
+    nullptr,      // mayResolve
+    nullptr,      // finalize
+    nullptr,      // call
+    nullptr,      // construct
+    nullptr,      // trace
+};
+
+const JSClass RecordObject::class_ = {"RecordObject",
+                                      JSCLASS_HAS_RESERVED_SLOTS(SlotCount),
+                                      &RecordObjectClassOps};