1 files changed, 69 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/other/UntrustedModulesBackupService.h b/toolkit/components/telemetry/other/UntrustedModulesBackupService.h
new file mode 100644
index 0000000000..15cfad216d
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+++ b/toolkit/components/telemetry/other/UntrustedModulesBackupService.h
@@ -0,0 +1,69 @@
+/* -*- 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 https://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_UntrustedModulesBackupService_h
+#define mozilla_UntrustedModulesBackupService_h
+
+#include "mozilla/UntrustedModulesData.h"
+#include "nsRefPtrHashtable.h"
+
+namespace mozilla {
+
+struct ProcessHashKey {
+  GeckoProcessType mType;
+  DWORD mPid;
+  ProcessHashKey(GeckoProcessType aType, DWORD aPid);
+  bool operator==(const ProcessHashKey& aOther) const;
+  PLDHashNumber Hash() const;
+};
+
+// UntrustedModulesData should not be refcounted as it's exchanged via IPC.
+// Instead, we define this container class owning UntrustedModulesData along
+// with a refcount.
+class MOZ_HEAP_CLASS UntrustedModulesDataContainer final {
+  ~UntrustedModulesDataContainer() = default;
+
+ public:
+  UntrustedModulesData mData;
+
+  explicit UntrustedModulesDataContainer(UntrustedModulesData&& aData)
+      : mData(std::move(aData)) {}
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(UntrustedModulesDataContainer)
+};
+
+class UntrustedModulesBackupData
+    : public nsRefPtrHashtable<nsGenericHashKey<ProcessHashKey>,
+                               UntrustedModulesDataContainer> {
+ public:
+  void Add(UntrustedModulesData&& aData);
+};
+
+class MOZ_HEAP_CLASS UntrustedModulesBackupService final {
+ public:
+  enum class BackupType : uint32_t {
+    Staging = 0,
+    Settled,
+
+    Count
+  };
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(UntrustedModulesBackupService)
+
+  static UntrustedModulesBackupService* Get();
+  void Backup(BackupType aType, UntrustedModulesData&& aData);
+  void SettleAllStagingData();
+  const UntrustedModulesBackupData& Ref(BackupType aType) const;
+
+ private:
+  UntrustedModulesBackupData mBackup[static_cast<uint32_t>(BackupType::Count)];
+
+  ~UntrustedModulesBackupService() = default;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_UntrustedModulesBackupService_h