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-rw-r--r--xpcom/components/ModuleUtils.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/xpcom/components/ModuleUtils.h b/xpcom/components/ModuleUtils.h
new file mode 100644
index 0000000000..92ec8aa173
--- /dev/null
+++ b/xpcom/components/ModuleUtils.h
@@ -0,0 +1,81 @@
+/* -*- 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 mozilla_GenericModule_h
+#define mozilla_GenericModule_h
+
+#include <type_traits>
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Module.h"
+
+#define NS_GENERIC_FACTORY_CONSTRUCTOR(_InstanceClass) \
+ static nsresult _InstanceClass##Constructor(REFNSIID aIID, void** aResult) { \
+ RefPtr<_InstanceClass> inst; \
+ \
+ *aResult = nullptr; \
+ \
+ inst = new _InstanceClass(); \
+ return inst->QueryInterface(aIID, aResult); \
+ }
+
+#define NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(_InstanceClass, _InitMethod) \
+ static nsresult _InstanceClass##Constructor(REFNSIID aIID, void** aResult) { \
+ nsresult rv; \
+ \
+ RefPtr<_InstanceClass> inst; \
+ \
+ *aResult = nullptr; \
+ \
+ inst = new _InstanceClass(); \
+ rv = inst->_InitMethod(); \
+ if (NS_SUCCEEDED(rv)) { \
+ rv = inst->QueryInterface(aIID, aResult); \
+ } \
+ \
+ return rv; \
+ }
+
+namespace mozilla {
+namespace detail {
+
+template <typename T>
+struct RemoveAlreadyAddRefed {
+ using Type = T;
+};
+
+template <typename T>
+struct RemoveAlreadyAddRefed<already_AddRefed<T>> {
+ using Type = T;
+};
+
+} // namespace detail
+} // namespace mozilla
+
+// 'Constructor' that uses an existing getter function that gets a singleton.
+#define NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(_InstanceClass, _GetterProc) \
+ static nsresult _InstanceClass##Constructor(REFNSIID aIID, void** aResult) { \
+ RefPtr<_InstanceClass> inst; \
+ \
+ *aResult = nullptr; \
+ \
+ using T = \
+ mozilla::detail::RemoveAlreadyAddRefed<decltype(_GetterProc())>::Type; \
+ static_assert( \
+ std::is_same_v<already_AddRefed<T>, decltype(_GetterProc())>, \
+ "Singleton constructor must return already_AddRefed"); \
+ static_assert( \
+ std::is_base_of<_InstanceClass, T>::value, \
+ "Singleton constructor must return correct already_AddRefed"); \
+ inst = _GetterProc(); \
+ if (nullptr == inst) { \
+ return NS_ERROR_OUT_OF_MEMORY; \
+ } \
+ return inst->QueryInterface(aIID, aResult); \
+ }
+
+#endif // mozilla_GenericModule_h