1 files changed, 39 insertions, 0 deletions
diff --git a/modules/libpref/init/StaticPrefListBegin.h b/modules/libpref/init/StaticPrefListBegin.h
new file mode 100644
index 0000000000..71b2cb505d
--- /dev/null
+++ b/modules/libpref/init/StaticPrefListBegin.h
@@ -0,0 +1,39 @@
+/* -*- 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/. */
+
+// This file does not make sense on its own. It must be #included along with
+// StaticPrefsListEnd.h in all headers that contribute prefs to the StaticPrefs
+// namespace.
+
+#include "StaticPrefsBase.h"
+#include "MainThreadUtils.h"  // for NS_IsMainThread()
+
+namespace mozilla {
+namespace StaticPrefs {
+
+// For mirrored prefs we generate an extern variable declaration and three
+// getter declarations/definitions.
+#define NEVER_PREF(name, cpp_type, default_value)
+#define ALWAYS_PREF(name, base_id, full_id, cpp_type, default_value)          \
+  extern cpp_type sMirror_##full_id;                                          \
+  inline StripAtomic<cpp_type> full_id() {                                    \
+    MOZ_DIAGNOSTIC_ASSERT(IsAtomic<cpp_type>::value || NS_IsMainThread(),     \
+                          "Non-atomic static pref '" name                     \
+                          "' being accessed on background thread by getter"); \
+    return sMirror_##full_id;                                                 \
+  }                                                                           \
+  inline const char* GetPrefName_##base_id() { return name; }                 \
+  inline StripAtomic<cpp_type> GetPrefDefault_##base_id() {                   \
+    return default_value;                                                     \
+  }
+#define ONCE_PREF(name, base_id, full_id, cpp_type, default_value) \
+  extern cpp_type sMirror_##full_id;                               \
+  inline cpp_type full_id() {                                      \
+    MaybeInitOncePrefs();                                          \
+    return sMirror_##full_id;                                      \
+  }                                                                \
+  inline const char* GetPrefName_##base_id() { return name; }      \
+  inline cpp_type GetPrefDefault_##base_id() { return default_value; }