1 files changed, 58 insertions, 0 deletions
diff --git a/ipc/chromium/src/chrome/common/ipc_channel_utils.cc b/ipc/chromium/src/chrome/common/ipc_channel_utils.cc
new file mode 100644
index 0000000000..7e737762f3
--- /dev/null
+++ b/ipc/chromium/src/chrome/common/ipc_channel_utils.cc
@@ -0,0 +1,58 @@
+/* -*- 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 "chrome/common/ipc_channel_utils.h"
+
+#include "mozilla/ProfilerMarkers.h"
+#include "chrome/common/ipc_message.h"
+#include "base/process.h"
+
+namespace IPC {
+
+void AddIPCProfilerMarker(const Message& aMessage, int32_t aOtherPid,
+                          mozilla::ipc::MessageDirection aDirection,
+                          mozilla::ipc::MessagePhase aPhase) {
+  if (aMessage.routing_id() != MSG_ROUTING_NONE &&
+      profiler_feature_active(ProfilerFeature::IPCMessages)) {
+    if (static_cast<base::ProcessId>(aOtherPid) == base::kInvalidProcessId) {
+      DLOG(WARNING) << "Unable to record IPC profile marker, other PID not set";
+      return;
+    }
+
+    if (profiler_is_locked_on_current_thread()) {
+      // One of the profiler mutexes is locked on this thread, don't record
+      // markers, because we don't want to expose profiler IPCs due to the
+      // profiler itself, and also to avoid possible re-entrancy issues.
+      return;
+    }
+
+    // The current timestamp must be given to the `IPCMarker` payload.
+    [[maybe_unused]] const mozilla::TimeStamp now = mozilla::TimeStamp::Now();
+    bool isThreadBeingProfiled =
+        profiler_thread_is_being_profiled_for_markers();
+    PROFILER_MARKER(
+        "IPC", IPC,
+        mozilla::MarkerOptions(
+            mozilla::MarkerTiming::InstantAt(now),
+            // If the thread is being profiled, add the marker to
+            // the current thread. If the thread is not being
+            // profiled, add the marker to the main thread. It will
+            // appear in the main thread's IPC track. Profiler
+            // analysis UI correlates all the IPC markers from
+            // different threads and generates processed markers.
+            isThreadBeingProfiled ? mozilla::MarkerThreadId::CurrentThread()
+                                  : mozilla::MarkerThreadId::MainThread()),
+        IPCMarker, now, now, aOtherPid, aMessage.seqno(), aMessage.type(),
+        mozilla::ipc::UnknownSide, aDirection, aPhase, aMessage.is_sync(),
+        // aOriginThreadId: If the thread is being profiled, do not include a
+        // thread ID, as it's the same as the markers. Only include this field
+        // when the marker is being sent from another thread.
+        isThreadBeingProfiled ? mozilla::MarkerThreadId{}
+                              : mozilla::MarkerThreadId::CurrentThread());
+  }
+}
+
+}  // namespace IPC