Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 565 insertions, 0 deletions

diff --git a/tools/profiler/gecko/ProfilerChild.cpp b/tools/profiler/gecko/ProfilerChild.cpp
new file mode 100644
index 0000000000..db7ef99423
--- /dev/null
+++ b/tools/profiler/gecko/ProfilerChild.cpp
@@ -0,0 +1,565 @@
+/* -*- 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 "ProfilerChild.h"
+
+#include "GeckoProfiler.h"
+#include "platform.h"
+#include "ProfilerCodeAddressService.h"
+#include "ProfilerControl.h"
+#include "ProfilerParent.h"
+
+#include "chrome/common/ipc_channel.h"
+#include "nsPrintfCString.h"
+#include "nsThreadUtils.h"
+
+#include <memory>
+
+namespace mozilla {
+
+/* static */ DataMutexBase<ProfilerChild::ProfilerChildAndUpdate,
+                           baseprofiler::detail::BaseProfilerMutex>
+    ProfilerChild::sPendingChunkManagerUpdate{
+        "ProfilerChild::sPendingChunkManagerUpdate"};
+
+ProfilerChild::ProfilerChild()
+    : mThread(NS_GetCurrentThread()), mDestroyed(false) {
+  MOZ_COUNT_CTOR(ProfilerChild);
+}
+
+ProfilerChild::~ProfilerChild() { MOZ_COUNT_DTOR(ProfilerChild); }
+
+void ProfilerChild::ResolveChunkUpdate(
+    PProfilerChild::AwaitNextChunkManagerUpdateResolver& aResolve) {
+  MOZ_ASSERT(!!aResolve,
+             "ResolveChunkUpdate should only be called when there's a pending "
+             "resolver");
+  MOZ_ASSERT(
+      !mChunkManagerUpdate.IsNotUpdate(),
+      "ResolveChunkUpdate should only be called with a real or final update");
+  MOZ_ASSERT(
+      !mDestroyed,
+      "ResolveChunkUpdate should not be called if the actor was destroyed");
+  if (mChunkManagerUpdate.IsFinal()) {
+    // Final update, send a special "unreleased value", but don't clear the
+    // local copy so we know we got the final update.
+    std::move(aResolve)(ProfilerParent::MakeFinalUpdate());
+  } else {
+    // Optimization note: The ProfileBufferChunkManagerUpdate constructor takes
+    // the newly-released chunks nsTArray by reference-to-const, therefore
+    // constructing and then moving the array here would make a copy. So instead
+    // we first give it an empty array, and then we can write the data directly
+    // into the update's array.
+    ProfileBufferChunkManagerUpdate update{
+        mChunkManagerUpdate.UnreleasedBytes(),
+        mChunkManagerUpdate.ReleasedBytes(),
+        mChunkManagerUpdate.OldestDoneTimeStamp(),
+        {}};
+    update.newlyReleasedChunks().SetCapacity(
+        mChunkManagerUpdate.NewlyReleasedChunksRef().size());
+    for (const ProfileBufferControlledChunkManager::ChunkMetadata& chunk :
+         mChunkManagerUpdate.NewlyReleasedChunksRef()) {
+      update.newlyReleasedChunks().EmplaceBack(chunk.mDoneTimeStamp,
+                                               chunk.mBufferBytes);
+    }
+
+    std::move(aResolve)(update);
+
+    // Clear the update we just sent, so it's ready for later updates to be
+    // folded into it.
+    mChunkManagerUpdate.Clear();
+  }
+
+  // Discard the resolver, so it's empty next time there's a new request.
+  aResolve = nullptr;
+}
+
+void ProfilerChild::ProcessChunkManagerUpdate(
+    ProfileBufferControlledChunkManager::Update&& aUpdate) {
+  if (mDestroyed) {
+    return;
+  }
+  // Always store the data, it could be the final update.
+  mChunkManagerUpdate.Fold(std::move(aUpdate));
+  if (mAwaitNextChunkManagerUpdateResolver) {
+    // There is already a pending resolver, give it the info now.
+    ResolveChunkUpdate(mAwaitNextChunkManagerUpdateResolver);
+  }
+}
+
+/* static */ void ProfilerChild::ProcessPendingUpdate() {
+  auto lockedUpdate = sPendingChunkManagerUpdate.Lock();
+  if (!lockedUpdate->mProfilerChild || lockedUpdate->mUpdate.IsNotUpdate()) {
+    return;
+  }
+  lockedUpdate->mProfilerChild->mThread->Dispatch(NS_NewRunnableFunction(
+      "ProfilerChild::ProcessPendingUpdate", []() mutable {
+        auto lockedUpdate = sPendingChunkManagerUpdate.Lock();
+        if (!lockedUpdate->mProfilerChild ||
+            lockedUpdate->mUpdate.IsNotUpdate()) {
+          return;
+        }
+        lockedUpdate->mProfilerChild->ProcessChunkManagerUpdate(
+            std::move(lockedUpdate->mUpdate));
+        lockedUpdate->mUpdate.Clear();
+      }));
+}
+
+/* static */ bool ProfilerChild::IsLockedOnCurrentThread() {
+  return sPendingChunkManagerUpdate.Mutex().IsLockedOnCurrentThread();
+}
+
+void ProfilerChild::SetupChunkManager() {
+  mChunkManager = profiler_get_controlled_chunk_manager();
+  if (NS_WARN_IF(!mChunkManager)) {
+    return;
+  }
+
+  // Make sure there are no updates (from a previous run).
+  mChunkManagerUpdate.Clear();
+  {
+    auto lockedUpdate = sPendingChunkManagerUpdate.Lock();
+    lockedUpdate->mProfilerChild = this;
+    lockedUpdate->mUpdate.Clear();
+  }
+
+  mChunkManager->SetUpdateCallback(
+      [](ProfileBufferControlledChunkManager::Update&& aUpdate) {
+        // Updates from the chunk manager are stored for later processing.
+        // We avoid dispatching a task, as this could deadlock (if the queueing
+        // mutex is held elsewhere).
+        auto lockedUpdate = sPendingChunkManagerUpdate.Lock();
+        if (!lockedUpdate->mProfilerChild) {
+          return;
+        }
+        lockedUpdate->mUpdate.Fold(std::move(aUpdate));
+      });
+}
+
+void ProfilerChild::ResetChunkManager() {
+  if (!mChunkManager) {
+    return;
+  }
+
+  // We have a chunk manager, reset the callback, which will add a final
+  // pending update.
+  mChunkManager->SetUpdateCallback({});
+
+  // Clear the pending update.
+  auto lockedUpdate = sPendingChunkManagerUpdate.Lock();
+  lockedUpdate->mProfilerChild = nullptr;
+  lockedUpdate->mUpdate.Clear();
+  // And process a final update right now.
+  ProcessChunkManagerUpdate(
+      ProfileBufferControlledChunkManager::Update(nullptr));
+
+  mChunkManager = nullptr;
+  mAwaitNextChunkManagerUpdateResolver = nullptr;
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvStart(
+    const ProfilerInitParams& params, StartResolver&& aResolve) {
+  nsTArray<const char*> filterArray;
+  for (size_t i = 0; i < params.filters().Length(); ++i) {
+    filterArray.AppendElement(params.filters()[i].get());
+  }
+
+  profiler_start(PowerOfTwo32(params.entries()), params.interval(),
+                 params.features(), filterArray.Elements(),
+                 filterArray.Length(), params.activeTabID(), params.duration());
+
+  SetupChunkManager();
+
+  aResolve(/* unused */ true);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvEnsureStarted(
+    const ProfilerInitParams& params, EnsureStartedResolver&& aResolve) {
+  nsTArray<const char*> filterArray;
+  for (size_t i = 0; i < params.filters().Length(); ++i) {
+    filterArray.AppendElement(params.filters()[i].get());
+  }
+
+  profiler_ensure_started(PowerOfTwo32(params.entries()), params.interval(),
+                          params.features(), filterArray.Elements(),
+                          filterArray.Length(), params.activeTabID(),
+                          params.duration());
+
+  SetupChunkManager();
+
+  aResolve(/* unused */ true);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvStop(StopResolver&& aResolve) {
+  ResetChunkManager();
+  profiler_stop();
+  aResolve(/* unused */ true);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvPause(PauseResolver&& aResolve) {
+  profiler_pause();
+  aResolve(/* unused */ true);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvResume(ResumeResolver&& aResolve) {
+  profiler_resume();
+  aResolve(/* unused */ true);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvPauseSampling(
+    PauseSamplingResolver&& aResolve) {
+  profiler_pause_sampling();
+  aResolve(/* unused */ true);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvResumeSampling(
+    ResumeSamplingResolver&& aResolve) {
+  profiler_resume_sampling();
+  aResolve(/* unused */ true);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvWaitOnePeriodicSampling(
+    WaitOnePeriodicSamplingResolver&& aResolve) {
+  std::shared_ptr<WaitOnePeriodicSamplingResolver> resolve =
+      std::make_shared<WaitOnePeriodicSamplingResolver>(std::move(aResolve));
+  if (!profiler_callback_after_sampling(
+          [self = RefPtr(this), resolve](SamplingState aSamplingState) mutable {
+            if (self->mDestroyed) {
+              return;
+            }
+            MOZ_RELEASE_ASSERT(self->mThread);
+            self->mThread->Dispatch(NS_NewRunnableFunction(
+                "nsProfiler::WaitOnePeriodicSampling result on main thread",
+                [resolve = std::move(resolve), aSamplingState]() {
+                  (*resolve)(aSamplingState ==
+                                 SamplingState::SamplingCompleted ||
+                             aSamplingState ==
+                                 SamplingState::NoStackSamplingCompleted);
+                }));
+          })) {
+    // Callback was not added (e.g., profiler is not running) and will never be
+    // invoked, so we need to resolve the promise here.
+    (*resolve)(false);
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvClearAllPages() {
+  profiler_clear_all_pages();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvAwaitNextChunkManagerUpdate(
+    AwaitNextChunkManagerUpdateResolver&& aResolve) {
+  MOZ_ASSERT(!mDestroyed,
+             "Recv... should not be called if the actor was destroyed");
+  // Pick up pending updates if any.
+  {
+    auto lockedUpdate = sPendingChunkManagerUpdate.Lock();
+    if (lockedUpdate->mProfilerChild && !lockedUpdate->mUpdate.IsNotUpdate()) {
+      mChunkManagerUpdate.Fold(std::move(lockedUpdate->mUpdate));
+      lockedUpdate->mUpdate.Clear();
+    }
+  }
+  if (mChunkManagerUpdate.IsNotUpdate()) {
+    // No data yet, store the resolver for later.
+    mAwaitNextChunkManagerUpdateResolver = std::move(aResolve);
+  } else {
+    // We have data, send it now.
+    ResolveChunkUpdate(aResolve);
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvDestroyReleasedChunksAtOrBefore(
+    const TimeStamp& aTimeStamp) {
+  if (mChunkManager) {
+    mChunkManager->DestroyChunksAtOrBefore(aTimeStamp);
+  }
+  return IPC_OK();
+}
+
+struct GatherProfileThreadParameters
+    : public external::AtomicRefCounted<GatherProfileThreadParameters> {
+  MOZ_DECLARE_REFCOUNTED_TYPENAME(GatherProfileThreadParameters)
+
+  GatherProfileThreadParameters(
+      RefPtr<ProfilerChild> aProfilerChild,
+      RefPtr<ProgressLogger::SharedProgress> aProgress,
+      ProfilerChild::GatherProfileResolver&& aResolver)
+      : profilerChild(std::move(aProfilerChild)),
+        progress(std::move(aProgress)),
+        resolver(std::move(aResolver)) {}
+
+  RefPtr<ProfilerChild> profilerChild;
+
+  FailureLatchSource failureLatchSource;
+
+  // Separate RefPtr used when working on separate thread. This way, if the
+  // "ProfilerChild" thread decides to overwrite its mGatherProfileProgress with
+  // a new one, the work done here will still only use the old one.
+  RefPtr<ProgressLogger::SharedProgress> progress;
+
+  // Resolver for the GatherProfile promise. Must only be called on the
+  // "ProfilerChild" thread.
+  ProfilerChild::GatherProfileResolver resolver;
+};
+
+/* static */
+void ProfilerChild::GatherProfileThreadFunction(
+    void* already_AddRefedParameters) {
+  PR_SetCurrentThreadName("GatherProfileThread");
+
+  RefPtr<GatherProfileThreadParameters> parameters =
+      already_AddRefed<GatherProfileThreadParameters>{
+          static_cast<GatherProfileThreadParameters*>(
+              already_AddRefedParameters)};
+
+  ProgressLogger progressLogger(
+      parameters->progress, "Gather-profile thread started", "Profile sent");
+  using namespace mozilla::literals::ProportionValue_literals;  // For `1_pc`.
+
+  auto writer =
+      MakeUnique<SpliceableChunkedJSONWriter>(parameters->failureLatchSource);
+  if (!profiler_get_profile_json(
+          *writer,
+          /* aSinceTime */ 0,
+          /* aIsShuttingDown */ false,
+          progressLogger.CreateSubLoggerFromTo(
+              1_pc, "profiler_get_profile_json started", 99_pc,
+              "profiler_get_profile_json done"))) {
+    // Failed to get a profile, reset the writer pointer, so that we'll send a
+    // failure message.
+    writer.reset();
+  }
+
+  if (NS_WARN_IF(NS_FAILED(
+          parameters->profilerChild->mThread->Dispatch(NS_NewRunnableFunction(
+              "ProfilerChild::ProcessPendingUpdate",
+              [parameters,
+               // Forward progress logger to on-ProfilerChild-thread task, so
+               // that it doesn't get marked as 100% done when this off-thread
+               // function ends.
+               progressLogger = std::move(progressLogger),
+               writer = std::move(writer)]() mutable {
+                // We are now on the ProfilerChild thread, about to send the
+                // completed profile. Any incoming progress request will now be
+                // handled after this task ends, so updating the progress is now
+                // useless and we can just get rid of the progress storage.
+                if (parameters->profilerChild->mGatherProfileProgress ==
+                    parameters->progress) {
+                  // The ProfilerChild progress is still the one we know.
+                  parameters->profilerChild->mGatherProfileProgress = nullptr;
+                }
+
+                // Shmem allocation and promise resolution must be made on the
+                // ProfilerChild thread, that's why this task was needed here.
+                mozilla::ipc::Shmem shmem;
+                if (writer) {
+                  if (const size_t len = writer->ChunkedWriteFunc().Length();
+                      len < UINT32_MAX) {
+                    bool shmemSuccess = true;
+                    const bool copySuccess =
+                        writer->ChunkedWriteFunc()
+                            .CopyDataIntoLazilyAllocatedBuffer(
+                                [&](size_t allocationSize) -> char* {
+                                  MOZ_ASSERT(allocationSize == len + 1);
+                                  if (parameters->profilerChild->AllocShmem(
+                                          allocationSize, &shmem)) {
+                                    return shmem.get<char>();
+                                  }
+                                  shmemSuccess = false;
+                                  return nullptr;
+                                });
+                    if (!shmemSuccess || !copySuccess) {
+                      const nsPrintfCString message(
+                          (!shmemSuccess)
+                              ? "*Could not create shmem for profile from pid "
+                                "%u (%zu B)"
+                              : "*Could not write profile from pid %u (%zu B)",
+                          unsigned(profiler_current_process_id().ToNumber()),
+                          len);
+                      if (parameters->profilerChild->AllocShmem(
+                              message.Length() + 1, &shmem)) {
+                        strcpy(shmem.get<char>(), message.Data());
+                      }
+                    }
+                  } else {
+                    const nsPrintfCString message(
+                        "*Profile from pid %u bigger (%zu) than shmem max "
+                        "(%zu)",
+                        unsigned(profiler_current_process_id().ToNumber()), len,
+                        size_t(UINT32_MAX));
+                    if (parameters->profilerChild->AllocShmem(
+                            message.Length() + 1, &shmem)) {
+                      strcpy(shmem.get<char>(), message.Data());
+                    }
+                  }
+                  writer = nullptr;
+                } else {
+                  // No profile.
+                  const char* failure =
+                      parameters->failureLatchSource.GetFailure();
+                  const nsPrintfCString message(
+                      "*Could not generate profile from pid %u%s%s",
+                      unsigned(profiler_current_process_id().ToNumber()),
+                      failure ? ", failure: " : "", failure ? failure : "");
+                  if (parameters->profilerChild->AllocShmem(
+                          message.Length() + 1, &shmem)) {
+                    strcpy(shmem.get<char>(), message.Data());
+                  }
+                }
+
+                SharedLibraryInfo sharedLibraryInfo =
+                    SharedLibraryInfo::GetInfoForSelf();
+                parameters->resolver(IPCProfileAndAdditionalInformation{
+                    shmem, Some(ProfileGenerationAdditionalInformation{
+                               std::move(sharedLibraryInfo)})});
+              }))))) {
+    // Failed to dispatch the task to the ProfilerChild thread. The IPC cannot
+    // be resolved on this thread, so it will never be resolved!
+    // And it would be unsafe to modify mGatherProfileProgress; But the parent
+    // should notice that's it's not advancing anymore.
+  }
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvGatherProfile(
+    GatherProfileResolver&& aResolve) {
+  mGatherProfileProgress = MakeRefPtr<ProgressLogger::SharedProgress>();
+  mGatherProfileProgress->SetProgress(ProportionValue{0.0},
+                                      "Received gather-profile request");
+
+  auto parameters = MakeRefPtr<GatherProfileThreadParameters>(
+      this, mGatherProfileProgress, std::move(aResolve));
+
+  // The GatherProfileThreadFunction thread function will cast its void*
+  // argument to already_AddRefed<GatherProfileThreadParameters>.
+  parameters.get()->AddRef();
+  PRThread* gatherProfileThread = PR_CreateThread(
+      PR_SYSTEM_THREAD, GatherProfileThreadFunction, parameters.get(),
+      PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, PR_UNJOINABLE_THREAD, 0);
+
+  if (!gatherProfileThread) {
+    // Failed to create and start worker thread, resolve with an empty profile.
+    mozilla::ipc::Shmem shmem;
+    if (AllocShmem(1, &shmem)) {
+      shmem.get<char>()[0] = '\0';
+    }
+    parameters->resolver(IPCProfileAndAdditionalInformation{shmem, Nothing()});
+    // And clean up.
+    parameters.get()->Release();
+    mGatherProfileProgress = nullptr;
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ProfilerChild::RecvGetGatherProfileProgress(
+    GetGatherProfileProgressResolver&& aResolve) {
+  if (mGatherProfileProgress) {
+    aResolve(GatherProfileProgress{
+        mGatherProfileProgress->Progress().ToUnderlyingType(),
+        nsCString(mGatherProfileProgress->LastLocation())});
+  } else {
+    aResolve(
+        GatherProfileProgress{ProportionValue::MakeInvalid().ToUnderlyingType(),
+                              nsCString("No gather-profile in progress")});
+  }
+  return IPC_OK();
+}
+
+void ProfilerChild::ActorDestroy(ActorDestroyReason aActorDestroyReason) {
+  mDestroyed = true;
+}
+
+void ProfilerChild::Destroy() {
+  ResetChunkManager();
+  if (!mDestroyed) {
+    Close();
+  }
+}
+
+ProfileAndAdditionalInformation ProfilerChild::GrabShutdownProfile() {
+  LOG("GrabShutdownProfile");
+
+  UniquePtr<ProfilerCodeAddressService> service =
+      profiler_code_address_service_for_presymbolication();
+  FailureLatchSource failureLatch;
+  SpliceableChunkedJSONWriter writer{failureLatch};
+  writer.Start();
+  auto rv = profiler_stream_json_for_this_process(
+      writer, /* aSinceTime */ 0,
+      /* aIsShuttingDown */ true, service.get(), ProgressLogger{});
+  if (rv.isErr()) {
+    const char* failure = writer.GetFailure();
+    return ProfileAndAdditionalInformation(
+        nsPrintfCString("*Profile unavailable for pid %u%s%s",
+                        unsigned(profiler_current_process_id().ToNumber()),
+                        failure ? ", failure: " : "", failure ? failure : ""));
+  }
+
+  auto additionalInfo = rv.unwrap();
+
+  writer.StartArrayProperty("processes");
+  writer.EndArray();
+  writer.End();
+
+  const size_t len = writer.ChunkedWriteFunc().Length();
+  // This string and information are destined to be sent as a shutdown profile,
+  // which is limited by the maximum IPC message size.
+  // TODO: IPC to change to shmem (bug 1780330), raising this limit to
+  // JS::MaxStringLength.
+  if (len + additionalInfo.SizeOf() >=
+      size_t(IPC::Channel::kMaximumMessageSize)) {
+    return ProfileAndAdditionalInformation(
+        nsPrintfCString("*Profile from pid %u bigger (%zu) than IPC max (%zu)",
+                        unsigned(profiler_current_process_id().ToNumber()), len,
+                        size_t(IPC::Channel::kMaximumMessageSize)));
+  }
+
+  nsCString profileCString;
+  if (!profileCString.SetLength(len, fallible)) {
+    return ProfileAndAdditionalInformation(nsPrintfCString(
+        "*Could not allocate %zu bytes for profile from pid %u", len,
+        unsigned(profiler_current_process_id().ToNumber())));
+  }
+  MOZ_ASSERT(*(profileCString.Data() + len) == '\0',
+             "We expected a null at the end of the string buffer, to be "
+             "rewritten by CopyDataIntoLazilyAllocatedBuffer");
+
+  char* const profileBeginWriting = profileCString.BeginWriting();
+  if (!profileBeginWriting) {
+    return ProfileAndAdditionalInformation(
+        nsPrintfCString("*Could not write profile from pid %u",
+                        unsigned(profiler_current_process_id().ToNumber())));
+  }
+
+  // Here, we have enough space reserved in `profileCString`, starting at
+  // `profileBeginWriting`, copy the JSON profile there.
+  if (!writer.ChunkedWriteFunc().CopyDataIntoLazilyAllocatedBuffer(
+          [&](size_t aBufferLen) -> char* {
+            MOZ_RELEASE_ASSERT(aBufferLen == len + 1);
+            return profileBeginWriting;
+          })) {
+    return ProfileAndAdditionalInformation(
+        nsPrintfCString("*Could not copy profile from pid %u",
+                        unsigned(profiler_current_process_id().ToNumber())));
+  }
+  MOZ_ASSERT(*(profileCString.Data() + len) == '\0',
+             "We still expected a null at the end of the string buffer");
+
+  return ProfileAndAdditionalInformation{std::move(profileCString),
+                                         std::move(additionalInfo)};
+}
+
+}  // namespace mozilla