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// 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/debug/trace_event.h"
#include "base/pending_task.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_FLOW_BEGIN0(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"),
queue_function,
TRACE_ID_MANGLE(GetTaskTraceID(pending_task)));
}
void TaskAnnotator::RunTask(const char* queue_function,
const char* run_function,
const PendingTask& pending_task) {
tracked_objects::ThreadData::PrepareForStartOfRun(pending_task.birth_tally);
tracked_objects::TaskStopwatch stopwatch;
stopwatch.Start();
tracked_objects::Duration queue_duration =
stopwatch.StartTime() - pending_task.EffectiveTimePosted();
TRACE_EVENT_FLOW_END1(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"),
queue_function,
TRACE_ID_MANGLE(GetTaskTraceID(pending_task)),
"queue_duration",
queue_duration.InMilliseconds());
// When tracing memory for posted tasks it's more valuable to attribute the
// memory allocations to the source function than generically to the task
// runner.
TRACE_EVENT_WITH_MEMORY_TAG2(
"toplevel",
run_function,
pending_task.posted_from.function_name(), // Name for memory tracking.
"src_file",
pending_task.posted_from.file_name(),
"src_func",
pending_task.posted_from.function_name());
// 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
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