1 files changed, 70 insertions, 0 deletions
diff --git a/xpcom/ds/nsGkAtoms.cpp b/xpcom/ds/nsGkAtoms.cpp
new file mode 100644
index 0000000000..402e0eb779
--- /dev/null
+++ b/xpcom/ds/nsGkAtoms.cpp
@@ -0,0 +1,70 @@
+/* -*- 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 "nsGkAtoms.h"
+
+namespace mozilla {
+namespace detail {
+
+// Because this is `constexpr` it ends up in read-only memory where it can be
+// shared between processes.
+extern constexpr GkAtoms gGkAtoms = {
+// The initialization of each atom's string.
+//
+// Expansion of the example GK_ATOM entries in nsGkAtoms.h:
+//
+//   u"a",
+//   u"bb",
+//   u"Ccc",
+//
+#define GK_ATOM(name_, value_, hash_, is_ascii_lower_, type_, atom_type_) \
+  u"" value_,
+#include "nsGkAtomList.h"
+#undef GK_ATOM
+    {
+// The initialization of the atoms themselves.
+//
+// Note that |value_| is an 8-bit string, and so |sizeof(value_)| is equal
+// to the number of chars (including the terminating '\0'). The |u""| prefix
+// converts |value_| to a 16-bit string.
+//
+// Expansion of the example GK_ATOM entries in nsGkAtoms.h:
+//
+//   nsStaticAtom(
+//     1,
+//     0x01234567,
+//     offsetof(GkAtoms, mAtoms[static_cast<size_t>(GkAtoms::Atoms::a)]) -
+//       offsetof(GkAtoms, a_string),
+//     true),
+//
+//   nsStaticAtom(
+//     2,
+//     0x12345678,
+//     offsetof(GkAtoms, mAtoms[static_cast<size_t>(GkAtoms::Atoms::bb)]) -
+//       offsetof(GkAtoms, bb_string),
+//     false),
+//
+//   nsStaticAtom(
+//     3,
+//     0x23456789,
+//     offsetof(GkAtoms, mAtoms[static_cast<size_t>(GkAtoms::Atoms::Ccc)]) -
+//       offsetof(GkAtoms, Ccc_string),
+//     false),
+//
+#define GK_ATOM(name_, value_, hash_, is_ascii_lower_, type_, atom_type_)     \
+  nsStaticAtom(                                                               \
+      sizeof(value_) - 1, hash_,                                              \
+      offsetof(GkAtoms, mAtoms[static_cast<size_t>(GkAtoms::Atoms::name_)]) - \
+          offsetof(GkAtoms, name_##_string),                                  \
+      is_ascii_lower_),
+#include "nsGkAtomList.h"
+#undef GK_ATOM
+    }};
+
+}  // namespace detail
+}  // namespace mozilla
+
+const nsStaticAtom* const nsGkAtoms::sAtoms = mozilla::detail::gGkAtoms.mAtoms;