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-rw-r--r--tools/profiler/gecko/ChildProfilerController.cpp170
1 files changed, 170 insertions, 0 deletions
diff --git a/tools/profiler/gecko/ChildProfilerController.cpp b/tools/profiler/gecko/ChildProfilerController.cpp
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index 0000000000..f51cb9437d
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+++ b/tools/profiler/gecko/ChildProfilerController.cpp
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+/* -*- 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 "ChildProfilerController.h"
+
+#include "ProfilerChild.h"
+
+#include "mozilla/ProfilerState.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "nsExceptionHandler.h"
+#include "nsIThread.h"
+#include "nsThreadUtils.h"
+
+using namespace mozilla::ipc;
+
+namespace mozilla {
+
+/* static */
+already_AddRefed<ChildProfilerController> ChildProfilerController::Create(
+ mozilla::ipc::Endpoint<PProfilerChild>&& aEndpoint) {
+ MOZ_RELEASE_ASSERT(NS_IsMainThread());
+ RefPtr<ChildProfilerController> cpc = new ChildProfilerController();
+ cpc->Init(std::move(aEndpoint));
+ return cpc.forget();
+}
+
+ChildProfilerController::ChildProfilerController()
+ : mThread(nullptr, "ChildProfilerController::mThread") {
+ MOZ_COUNT_CTOR(ChildProfilerController);
+}
+
+void ChildProfilerController::Init(Endpoint<PProfilerChild>&& aEndpoint) {
+ RefPtr<nsIThread> newProfilerChildThread;
+ if (NS_SUCCEEDED(NS_NewNamedThread("ProfilerChild",
+ getter_AddRefs(newProfilerChildThread)))) {
+ {
+ auto lock = mThread.Lock();
+ RefPtr<nsIThread>& lockedmThread = lock.ref();
+ MOZ_ASSERT(!lockedmThread, "There is already a ProfilerChild thread");
+ // Copy ref'd ptr into mThread. Don't move/swap, so that
+ // newProfilerChildThread can be used below.
+ lockedmThread = newProfilerChildThread;
+ }
+ // Now that mThread has been set, run SetupProfilerChild on the thread.
+ newProfilerChildThread->Dispatch(
+ NewRunnableMethod<Endpoint<PProfilerChild>&&>(
+ "ChildProfilerController::SetupProfilerChild", this,
+ &ChildProfilerController::SetupProfilerChild, std::move(aEndpoint)),
+ NS_DISPATCH_NORMAL);
+ }
+}
+
+ProfileAndAdditionalInformation
+ChildProfilerController::GrabShutdownProfileAndShutdown() {
+ ProfileAndAdditionalInformation profileAndAdditionalInformation;
+ ShutdownAndMaybeGrabShutdownProfileFirst(&profileAndAdditionalInformation);
+ return profileAndAdditionalInformation;
+}
+
+void ChildProfilerController::Shutdown() {
+ ShutdownAndMaybeGrabShutdownProfileFirst(nullptr);
+}
+
+void ChildProfilerController::ShutdownAndMaybeGrabShutdownProfileFirst(
+ ProfileAndAdditionalInformation* aOutShutdownProfileInformation) {
+ // First, get the owning reference out of mThread, so it cannot be used in
+ // ChildProfilerController after this (including re-entrantly during the
+ // profilerChildThread->Shutdown() inner event loop below).
+ RefPtr<nsIThread> profilerChildThread;
+ {
+ auto lock = mThread.Lock();
+ RefPtr<nsIThread>& lockedmThread = lock.ref();
+ lockedmThread.swap(profilerChildThread);
+ }
+ if (profilerChildThread) {
+ if (profiler_is_active()) {
+ CrashReporter::AnnotateCrashReport(
+ CrashReporter::Annotation::ProfilerChildShutdownPhase,
+ "Profiling - Dispatching ShutdownProfilerChild"_ns);
+ profilerChildThread->Dispatch(
+ NewRunnableMethod<ProfileAndAdditionalInformation*>(
+ "ChildProfilerController::ShutdownProfilerChild", this,
+ &ChildProfilerController::ShutdownProfilerChild,
+ aOutShutdownProfileInformation),
+ NS_DISPATCH_NORMAL);
+ // Shut down the thread. This call will spin until all runnables
+ // (including the ShutdownProfilerChild runnable) have been processed.
+ profilerChildThread->Shutdown();
+ } else {
+ CrashReporter::AnnotateCrashReport(
+ CrashReporter::Annotation::ProfilerChildShutdownPhase,
+ "Not profiling - Running ShutdownProfilerChild"_ns);
+ // If we're not profiling, this operation will be very quick, so it can be
+ // done synchronously. This avoids having to manually shutdown the thread,
+ // which runs a risky inner event loop, see bug 1613798.
+ NS_DispatchAndSpinEventLoopUntilComplete(
+ "ChildProfilerController::ShutdownProfilerChild SYNC"_ns,
+ profilerChildThread,
+ NewRunnableMethod<ProfileAndAdditionalInformation*>(
+ "ChildProfilerController::ShutdownProfilerChild SYNC", this,
+ &ChildProfilerController::ShutdownProfilerChild, nullptr));
+ }
+ // At this point, `profilerChildThread` should be the last reference to the
+ // thread, so it will now get destroyed.
+ }
+}
+
+ChildProfilerController::~ChildProfilerController() {
+ MOZ_COUNT_DTOR(ChildProfilerController);
+
+#ifdef DEBUG
+ {
+ auto lock = mThread.Lock();
+ RefPtr<nsIThread>& lockedmThread = lock.ref();
+ MOZ_ASSERT(
+ !lockedmThread,
+ "Please call Shutdown before destroying ChildProfilerController");
+ }
+#endif
+ MOZ_ASSERT(!mProfilerChild);
+}
+
+void ChildProfilerController::SetupProfilerChild(
+ Endpoint<PProfilerChild>&& aEndpoint) {
+ {
+ auto lock = mThread.Lock();
+ RefPtr<nsIThread>& lockedmThread = lock.ref();
+ // We should be on the ProfilerChild thread. In rare cases, we could already
+ // be in shutdown, in which case mThread is null; we still need to continue,
+ // so that ShutdownProfilerChild can work on a valid mProfilerChild.
+ MOZ_RELEASE_ASSERT(!lockedmThread ||
+ lockedmThread == NS_GetCurrentThread());
+ }
+ MOZ_ASSERT(aEndpoint.IsValid());
+
+ mProfilerChild = new ProfilerChild();
+ Endpoint<PProfilerChild> endpoint = std::move(aEndpoint);
+
+ if (!endpoint.Bind(mProfilerChild)) {
+ MOZ_CRASH("Failed to bind ProfilerChild!");
+ }
+}
+
+void ChildProfilerController::ShutdownProfilerChild(
+ ProfileAndAdditionalInformation* aOutShutdownProfileInformation) {
+ const bool isProfiling = profiler_is_active();
+ if (aOutShutdownProfileInformation) {
+ CrashReporter::AnnotateCrashReport(
+ CrashReporter::Annotation::ProfilerChildShutdownPhase,
+ isProfiling ? "Profiling - GrabShutdownProfile"_ns
+ : "Not profiling - GrabShutdownProfile"_ns);
+ *aOutShutdownProfileInformation = mProfilerChild->GrabShutdownProfile();
+ }
+ CrashReporter::AnnotateCrashReport(
+ CrashReporter::Annotation::ProfilerChildShutdownPhase,
+ isProfiling ? "Profiling - Destroying ProfilerChild"_ns
+ : "Not profiling - Destroying ProfilerChild"_ns);
+ mProfilerChild->Destroy();
+ mProfilerChild = nullptr;
+ CrashReporter::AnnotateCrashReport(
+ CrashReporter::Annotation::ProfilerChildShutdownPhase,
+ isProfiling
+ ? "Profiling - ShutdownProfilerChild complete, waiting for thread shutdown"_ns
+ : "Not Profiling - ShutdownProfilerChild complete, waiting for thread shutdown"_ns);
+}
+
+} // namespace mozilla