1 files changed, 98 insertions, 0 deletions
diff --git a/xpcom/components/ModuleUtils.h b/xpcom/components/ModuleUtils.h
new file mode 100644
index 000000000..9c31ed76b
--- /dev/null
+++ b/xpcom/components/ModuleUtils.h
@@ -0,0 +1,98 @@
+/* -*- 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 "mozilla/Attributes.h"
+#include "mozilla/Module.h"
+
+#define NS_GENERIC_FACTORY_CONSTRUCTOR(_InstanceClass)                        \
+static nsresult                                                               \
+_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
+                            void **aResult)                                   \
+{                                                                             \
+  RefPtr<_InstanceClass> inst;                                                \
+                                                                              \
+  *aResult = nullptr;                                                         \
+  if (nullptr != aOuter) {                                                    \
+    return NS_ERROR_NO_AGGREGATION;                                           \
+  }                                                                           \
+                                                                              \
+  inst = new _InstanceClass();                                                \
+  return inst->QueryInterface(aIID, aResult);                                 \
+}
+
+#define NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(_InstanceClass, _InitMethod)      \
+static nsresult                                                               \
+_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
+                            void **aResult)                                   \
+{                                                                             \
+  nsresult rv;                                                                \
+                                                                              \
+  RefPtr<_InstanceClass> inst;                                                \
+                                                                              \
+  *aResult = nullptr;                                                         \
+  if (nullptr != aOuter) {                                                    \
+    return NS_ERROR_NO_AGGREGATION;                                           \
+  }                                                                           \
+                                                                              \
+  inst = new _InstanceClass();                                                \
+  rv = inst->_InitMethod();                                                   \
+  if (NS_SUCCEEDED(rv)) {                                                     \
+    rv = inst->QueryInterface(aIID, aResult);                                 \
+  }                                                                           \
+                                                                              \
+  return rv;                                                                  \
+}
+
+// 'Constructor' that uses an existing getter function that gets a singleton.
+// NOTE: assumes that getter does an AddRef - so additional AddRef is not done.
+#define NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(_InstanceClass, _GetterProc) \
+static nsresult                                                               \
+_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
+                            void **aResult)                                   \
+{                                                                             \
+  RefPtr<_InstanceClass> inst;                                                \
+                                                                              \
+  *aResult = nullptr;                                                         \
+  if (nullptr != aOuter) {                                                    \
+    return NS_ERROR_NO_AGGREGATION;                                           \
+  }                                                                           \
+                                                                              \
+  inst = already_AddRefed<_InstanceClass>(_GetterProc());                     \
+  if (nullptr == inst) {                                                      \
+    return NS_ERROR_OUT_OF_MEMORY;                                            \
+  }                                                                           \
+  return inst->QueryInterface(aIID, aResult);                                 \
+}
+
+#ifndef MOZILLA_INTERNAL_API
+
+#include "nsIModule.h"
+#include "nsISupportsUtils.h"
+
+namespace mozilla {
+
+class GenericModule final : public nsIModule
+{
+  ~GenericModule() {}
+
+public:
+  explicit GenericModule(const mozilla::Module* aData) : mData(aData) {}
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIMODULE
+
+private:
+  const mozilla::Module* mData;
+};
+
+} // namespace mozilla
+
+#endif
+
+#endif // mozilla_GenericModule_h