65 lines
2.3 KiB
C++
65 lines
2.3 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/debug/task_annotator.h"
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#include "base/debug/alias.h"
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#include "base/pending_task.h"
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#include "base/trace_event/trace_event.h"
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#include "base/tracked_objects.h"
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namespace base {
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namespace debug {
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TaskAnnotator::TaskAnnotator() {
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}
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TaskAnnotator::~TaskAnnotator() {
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}
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void TaskAnnotator::DidQueueTask(const char* queue_function,
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const PendingTask& pending_task) {
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TRACE_EVENT_WITH_FLOW0(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"),
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queue_function,
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TRACE_ID_MANGLE(GetTaskTraceID(pending_task)),
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TRACE_EVENT_FLAG_FLOW_OUT);
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}
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void TaskAnnotator::RunTask(const char* queue_function,
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const PendingTask& pending_task) {
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tracked_objects::TaskStopwatch stopwatch;
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stopwatch.Start();
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tracked_objects::Duration queue_duration =
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stopwatch.StartTime() - pending_task.EffectiveTimePosted();
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TRACE_EVENT_WITH_FLOW1(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"),
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queue_function,
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TRACE_ID_MANGLE(GetTaskTraceID(pending_task)),
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TRACE_EVENT_FLAG_FLOW_IN,
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"queue_duration",
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queue_duration.InMilliseconds());
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// Before running the task, store the program counter where it was posted
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// and deliberately alias it to ensure it is on the stack if the task
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// crashes. Be careful not to assume that the variable itself will have the
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// expected value when displayed by the optimizer in an optimized build.
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// Look at a memory dump of the stack.
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const void* program_counter = pending_task.posted_from.program_counter();
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debug::Alias(&program_counter);
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pending_task.task.Run();
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stopwatch.Stop();
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tracked_objects::ThreadData::TallyRunOnNamedThreadIfTracking(
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pending_task, stopwatch);
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}
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uint64_t TaskAnnotator::GetTaskTraceID(const PendingTask& task) const {
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return (static_cast<uint64_t>(task.sequence_num) << 32) |
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((static_cast<uint64_t>(reinterpret_cast<intptr_t>(this)) << 32) >>
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32);
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}
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} // namespace debug
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} // namespace base
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