mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-12-01 01:36:09 +03:00
66 lines
2.4 KiB
C++
66 lines
2.4 KiB
C++
|
// 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 <array>
|
||
|
|
|
||
|
|
#include "base/debug/activity_tracker.h"
|
||
|
|
#include "base/debug/alias.h"
|
||
|
|
#include "base/pending_task.h"
|
||
|
|
#include "base/trace_event/trace_event.h"
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
namespace debug {
|
||
|
|
|
||
|
|
TaskAnnotator::TaskAnnotator() = default;
|
||
|
|
|
||
|
|
TaskAnnotator::~TaskAnnotator() = default;
|
||
|
|
|
||
|
|
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,
|
||
|
|
PendingTask* pending_task) {
|
||
|
|
ScopedTaskRunActivity task_activity(*pending_task);
|
||
|
|
|
||
|
|
TRACE_EVENT_WITH_FLOW0(
|
||
|
|
TRACE_DISABLED_BY_DEFAULT("toplevel.flow"), queue_function,
|
||
|
|
TRACE_ID_MANGLE(GetTaskTraceID(*pending_task)), TRACE_EVENT_FLAG_FLOW_IN);
|
||
|
|
|
||
|
|
// Before running the task, store the task backtrace with the chain of
|
||
|
|
// PostTasks that resulted in this call 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.
|
||
|
|
static constexpr int kStackTaskTraceSnapshotSize =
|
||
|
|
std::tuple_size<decltype(pending_task->task_backtrace)>::value + 3;
|
||
|
|
std::array<const void*, kStackTaskTraceSnapshotSize> task_backtrace;
|
||
|
|
|
||
|
|
// Store a marker to locate |task_backtrace| content easily on a memory
|
||
|
|
// dump.
|
||
|
|
task_backtrace.front() = reinterpret_cast<void*>(0xefefefefefefefef);
|
||
|
|
task_backtrace.back() = reinterpret_cast<void*>(0xfefefefefefefefe);
|
||
|
|
|
||
|
|
task_backtrace[1] = pending_task->posted_from.program_counter();
|
||
|
|
std::copy(pending_task->task_backtrace.begin(),
|
||
|
|
pending_task->task_backtrace.end(), task_backtrace.begin() + 2);
|
||
|
|
debug::Alias(&task_backtrace);
|
||
|
|
|
||
|
|
std::move(pending_task->task).Run();
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t TaskAnnotator::GetTaskTraceID(const PendingTask& task) const {
|
||
|
|
return (static_cast<uint64_t>(task.sequence_num) << 32) |
|
||
|
|
((static_cast<uint64_t>(reinterpret_cast<intptr_t>(this)) << 32) >>
|
||
|
|
32);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace debug
|
||
|
|
} // namespace base
|