| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/debug/task_annotator.h" |
| |
| #include "base/debug/alias.h" |
| #include "base/pending_task.h" |
| #include "base/trace_event/trace_event.h" |
| #include "base/tracked_objects.h" |
| |
| namespace base { |
| namespace debug { |
| |
| TaskAnnotator::TaskAnnotator() { |
| } |
| |
| TaskAnnotator::~TaskAnnotator() { |
| } |
| |
| void TaskAnnotator::DidQueueTask(const char* queue_function, |
| const PendingTask& pending_task) { |
| TRACE_EVENT_WITH_FLOW0(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"), |
| queue_function, |
| TRACE_ID_MANGLE(GetTaskTraceID(pending_task)), |
| TRACE_EVENT_FLAG_FLOW_OUT); |
| } |
| |
| void TaskAnnotator::RunTask(const char* queue_function, |
| const PendingTask& pending_task) { |
| tracked_objects::TaskStopwatch stopwatch; |
| stopwatch.Start(); |
| tracked_objects::Duration queue_duration = |
| stopwatch.StartTime() - pending_task.EffectiveTimePosted(); |
| |
| TRACE_EVENT_WITH_FLOW1(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"), |
| queue_function, |
| TRACE_ID_MANGLE(GetTaskTraceID(pending_task)), |
| TRACE_EVENT_FLAG_FLOW_IN, |
| "queue_duration", |
| queue_duration.InMilliseconds()); |
| |
| // Before running the task, store the program counter where it was posted |
| // and deliberately alias it to ensure it is on the stack if the task |
| // crashes. Be careful not to assume that the variable itself will have the |
| // expected value when displayed by the optimizer in an optimized build. |
| // Look at a memory dump of the stack. |
| const void* program_counter = pending_task.posted_from.program_counter(); |
| debug::Alias(&program_counter); |
| |
| pending_task.task.Run(); |
| |
| stopwatch.Stop(); |
| tracked_objects::ThreadData::TallyRunOnNamedThreadIfTracking( |
| pending_task, stopwatch); |
| } |
| |
| uint64 TaskAnnotator::GetTaskTraceID(const PendingTask& task) const { |
| return (static_cast<uint64>(task.sequence_num) << 32) | |
| ((static_cast<uint64>(reinterpret_cast<intptr_t>(this)) << 32) >> 32); |
| } |
| |
| } // namespace debug |
| } // namespace base |