1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/vm/WellKnownAtom.h b/js/src/vm/WellKnownAtom.h
new file mode 100644
index 0000000000..0f35c4db99
--- /dev/null
+++ b/js/src/vm/WellKnownAtom.h
@@ -0,0 +1,54 @@
+/* -*- 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 vm_WellKnownAtom_h
+#define vm_WellKnownAtom_h
+
+#include "mozilla/HashFunctions.h"  // mozilla::HashNumber, mozilla::HashStringKnownLength
+
+#include <stdint.h>  // uint32_t
+
+#include "js/ProtoKey.h"             // JS_FOR_EACH_PROTOTYPE
+#include "js/Symbol.h"               // JS_FOR_EACH_WELL_KNOWN_SYMBOL
+#include "vm/CommonPropertyNames.h"  // FOR_EACH_COMMON_PROPERTYNAME
+
+namespace js {
+
+// An index for well-known atoms.
+//
+// GetWellKnownAtom in ParserAtom.cpp relies on the fact that
+// JSAtomState fields and this enum variants use the same order.
+enum class WellKnownAtomId : uint32_t {
+#define ENUM_ENTRY_(NAME, _) NAME,
+  FOR_EACH_COMMON_PROPERTYNAME(ENUM_ENTRY_)
+#undef ENUM_ENTRY_
+
+#define ENUM_ENTRY_(NAME, _) NAME,
+      JS_FOR_EACH_PROTOTYPE(ENUM_ENTRY_)
+#undef ENUM_ENTRY_
+
+#define ENUM_ENTRY_(NAME) NAME,
+          JS_FOR_EACH_WELL_KNOWN_SYMBOL(ENUM_ENTRY_)
+#undef ENUM_ENTRY_
+
+              Limit,
+};
+
+struct WellKnownAtomInfo {
+  uint32_t length;
+  mozilla::HashNumber hash;
+  const char* content;
+};
+
+extern WellKnownAtomInfo wellKnownAtomInfos[];
+
+inline const WellKnownAtomInfo& GetWellKnownAtomInfo(WellKnownAtomId atomId) {
+  return wellKnownAtomInfos[uint32_t(atomId)];
+}
+
+} /* namespace js */
+
+#endif  // vm_WellKnownAtom_h