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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/test/launcher/test_launcher_tracer.h"
#include "base/json/json_file_value_serializer.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/values.h"
namespace base {
TestLauncherTracer::TestLauncherTracer()
: trace_start_time_(TimeTicks::Now()) {}
TestLauncherTracer::~TestLauncherTracer() = default;
int TestLauncherTracer::RecordProcessExecution(TimeTicks start_time,
TimeDelta duration) {
AutoLock lock(lock_);
int process_num = events_.size();
Event event;
event.name = StringPrintf("process #%d", process_num);
event.timestamp = start_time;
event.duration = duration;
event.thread_id = PlatformThread::CurrentId();
events_.push_back(event);
return process_num;
}
bool TestLauncherTracer::Dump(const FilePath& path) {
AutoLock lock(lock_);
Value::List json_events_list;
for (const Event& event : events_) {
Value::Dict json_event;
json_event.Set("name", event.name);
json_event.Set("ph", "X");
json_event.Set("ts",
checked_cast<int>(
(event.timestamp - trace_start_time_).InMicroseconds()));
json_event.Set("dur", checked_cast<int>(event.duration.InMicroseconds()));
// The TID might be an int64, however int64 values are not representable in
// JS and JSON (cf. crbug.com/40228085) since JS numbers are float64. Since
// thread IDs are likely to be allocated sequentially, truncation of the
// high bits is preferable to loss of precision in the low bits, as threads
// are more likely to differ in their low bit values, so we truncate the
// value to int32. Since this is only used for dumping test runner state,
// the loss of information is not catastrophic and won't happen in normal
// browser execution. Additionally, the test thread ids are also truncated,
// so the truncated values should match.
//
// LINT.IfChange(TestLauncherTidTruncation)
json_event.Set("tid", event.thread_id.truncate_to_int32_for_display_only());
// LINT.ThenChange(test_results_tracker.cc:TestLauncherTidTruncation)
// Add fake values required by the trace viewer.
json_event.Set("pid", 0);
json_events_list.Append(std::move(json_event));
}
JSONFileValueSerializer serializer(path);
return serializer.Serialize(json_events_list);
}
} // namespace base
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