1 files changed, 142 insertions, 0 deletions
diff --git a/dom/ipc/ContentProcessManager.cpp b/dom/ipc/ContentProcessManager.cpp
new file mode 100644
index 0000000000..c5647b4f26
--- /dev/null
+++ b/dom/ipc/ContentProcessManager.cpp
@@ -0,0 +1,142 @@
+/* -*- 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 "ContentProcessManager.h"
+#include "ContentParent.h"
+#include "mozilla/AppShutdown.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "mozilla/dom/BrowsingContextGroup.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
+
+#include "mozilla/StaticPtr.h"
+#include "mozilla/ClearOnShutdown.h"
+
+#include "nsPrintfCString.h"
+
+namespace mozilla::dom {
+
+/* static */
+StaticAutoPtr<ContentProcessManager> ContentProcessManager::sSingleton;
+
+/* static */
+ContentProcessManager* ContentProcessManager::GetSingleton() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  if (!sSingleton &&
+      !AppShutdown::IsInOrBeyond(ShutdownPhase::XPCOMShutdownFinal)) {
+    sSingleton = new ContentProcessManager();
+    ClearOnShutdown(&sSingleton);
+  }
+  return sSingleton;
+}
+
+void ContentProcessManager::AddContentProcess(ContentParent* aChildCp) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aChildCp);
+
+  mContentParentMap.WithEntryHandle(aChildCp->ChildID(), [&](auto&& entry) {
+    MOZ_ASSERT_IF(entry, entry.Data() == aChildCp);
+    entry.OrInsert(aChildCp);
+  });
+}
+
+void ContentProcessManager::RemoveContentProcess(
+    const ContentParentId& aChildCpId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MOZ_ALWAYS_TRUE(mContentParentMap.Remove(aChildCpId));
+}
+
+ContentParent* ContentProcessManager::GetContentProcessById(
+    const ContentParentId& aChildCpId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  ContentParent* contentParent = mContentParentMap.Get(aChildCpId);
+  if (NS_WARN_IF(!contentParent)) {
+    return nullptr;
+  }
+  return contentParent;
+}
+
+bool ContentProcessManager::RegisterRemoteFrame(BrowserParent* aChildBp) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aChildBp);
+
+  return mBrowserParentMap.WithEntryHandle(
+      aChildBp->GetTabId(), [&](auto&& entry) {
+        if (entry) {
+          MOZ_ASSERT(entry.Data() == aChildBp);
+          return false;
+        }
+
+        // Ensure that this BrowserParent's BrowsingContextGroup is kept alive
+        // until the BrowserParent has been unregistered, ensuring the group
+        // isn't destroyed while this BrowserParent can still send messages.
+        aChildBp->GetBrowsingContext()->Group()->AddKeepAlive();
+        entry.Insert(aChildBp);
+        return true;
+      });
+}
+
+void ContentProcessManager::UnregisterRemoteFrame(const TabId& aChildTabId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  auto childBp = mBrowserParentMap.Extract(aChildTabId);
+  MOZ_DIAGNOSTIC_ASSERT(childBp);
+
+  // Clear the corresponding keepalive which was added in `RegisterRemoteFrame`.
+  (*childBp)->GetBrowsingContext()->Group()->RemoveKeepAlive();
+}
+
+ContentParentId ContentProcessManager::GetTabProcessId(
+    const TabId& aChildTabId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (BrowserParent* browserParent = mBrowserParentMap.Get(aChildTabId)) {
+    return browserParent->Manager()->ChildID();
+  }
+  return ContentParentId(0);
+}
+
+uint32_t ContentProcessManager::GetBrowserParentCountByProcessId(
+    const ContentParentId& aChildCpId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  ContentParent* contentParent = mContentParentMap.Get(aChildCpId);
+  if (NS_WARN_IF(!contentParent)) {
+    return 0;
+  }
+  return contentParent->ManagedPBrowserParent().Count();
+}
+
+already_AddRefed<BrowserParent>
+ContentProcessManager::GetBrowserParentByProcessAndTabId(
+    const ContentParentId& aChildCpId, const TabId& aChildTabId) {
+  RefPtr<BrowserParent> browserParent = mBrowserParentMap.Get(aChildTabId);
+  if (NS_WARN_IF(!browserParent)) {
+    return nullptr;
+  }
+
+  if (NS_WARN_IF(browserParent->Manager()->ChildID() != aChildCpId)) {
+    return nullptr;
+  }
+
+  return browserParent.forget();
+}
+
+already_AddRefed<BrowserParent>
+ContentProcessManager::GetTopLevelBrowserParentByProcessAndTabId(
+    const ContentParentId& aChildCpId, const TabId& aChildTabId) {
+  RefPtr<BrowserParent> browserParent =
+      GetBrowserParentByProcessAndTabId(aChildCpId, aChildTabId);
+  while (browserParent && browserParent->GetBrowserBridgeParent()) {
+    browserParent = browserParent->GetBrowserBridgeParent()->Manager();
+  }
+
+  return browserParent.forget();
+}
+
+}  // namespace mozilla::dom