1 files changed, 65 insertions, 0 deletions
diff --git a/js/src/builtin/WeakMapObject-inl.h b/js/src/builtin/WeakMapObject-inl.h
new file mode 100644
index 0000000000..7dbe5cf8e5
--- /dev/null
+++ b/js/src/builtin/WeakMapObject-inl.h
@@ -0,0 +1,65 @@
+/* -*- 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/. */
+
+#ifndef builtin_WeakMapObject_inl_h
+#define builtin_WeakMapObject_inl_h
+
+#include "builtin/WeakMapObject.h"
+
+#include "js/friend/ErrorMessages.h"  // js::GetErrorMessage, JSMSG_*
+#include "js/Wrapper.h"
+#include "gc/WeakMap-inl.h"
+#include "vm/JSObject-inl.h"
+
+namespace js {
+
+static bool TryPreserveReflector(JSContext* cx, HandleObject obj) {
+  if (!MaybePreserveDOMWrapper(cx, obj)) {
+    JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+                              JSMSG_BAD_WEAKMAP_KEY);
+    return false;
+  }
+
+  return true;
+}
+
+static MOZ_ALWAYS_INLINE bool WeakCollectionPutEntryInternal(
+    JSContext* cx, Handle<WeakCollectionObject*> obj, HandleObject key,
+    HandleValue value) {
+  ObjectValueWeakMap* map = obj->getMap();
+  if (!map) {
+    auto newMap = cx->make_unique<ObjectValueWeakMap>(cx, obj.get());
+    if (!newMap) {
+      return false;
+    }
+    map = newMap.release();
+    InitReservedSlot(obj, WeakCollectionObject::DataSlot, map,
+                     MemoryUse::WeakMapObject);
+  }
+
+  // Preserve wrapped native keys to prevent wrapper optimization.
+  if (!TryPreserveReflector(cx, key)) {
+    return false;
+  }
+
+  RootedObject delegate(cx, UncheckedUnwrapWithoutExpose(key));
+  if (delegate && !TryPreserveReflector(cx, delegate)) {
+    return false;
+  }
+
+  MOZ_ASSERT(key->compartment() == obj->compartment());
+  MOZ_ASSERT_IF(value.isObject(),
+                value.toObject().compartment() == obj->compartment());
+  if (!map->put(key, value)) {
+    JS_ReportOutOfMemory(cx);
+    return false;
+  }
+  return true;
+}
+
+}  // namespace js
+
+#endif /* builtin_WeakMapObject_inl_h */