chromium/v8/include/v8-metrics.h

// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_METRICS_H_
#define V8_METRICS_H_

#include <stddef.h>
#include <stdint.h>

#include <vector>

#include "v8-internal.h"      // NOLINT(build/include_directory)
#include "v8-local-handle.h"  // NOLINT(build/include_directory)
#include "v8config.h"         // NOLINT(build/include_directory)

namespace v8 {

class Context;
class Isolate;

namespace metrics {

struct GarbageCollectionPhases { … };

struct GarbageCollectionSizes { … };

struct GarbageCollectionFullCycle { … };

struct GarbageCollectionFullMainThreadIncrementalMark { … };

struct GarbageCollectionFullMainThreadIncrementalSweep { … };

template <typename EventType>
struct GarbageCollectionBatchedEvents { … };

GarbageCollectionFullMainThreadBatchedIncrementalMark;
GarbageCollectionFullMainThreadBatchedIncrementalSweep;

struct GarbageCollectionYoungCycle { … };

struct WasmModuleDecoded { … };

struct WasmModuleCompiled { … };

struct WasmModuleInstantiated { … };

struct WasmModulesPerIsolate { … };

/**
 * This class serves as a base class for recording event-based metrics in V8.
 * There a two kinds of metrics, those which are expected to be thread-safe and
 * whose implementation is required to fulfill this requirement and those whose
 * implementation does not have that requirement and only needs to be
 * executable on the main thread. If such an event is triggered from a
 * background thread, it will be delayed and executed by the foreground task
 * runner.
 *
 * The embedder is expected to call v8::Isolate::SetMetricsRecorder()
 * providing its implementation and have the virtual methods overwritten
 * for the events it cares about.
 */
class V8_EXPORT Recorder { … } … };

/**
 * Experimental API intended for the LongTasks UKM (crbug.com/1173527).
 * The Reset() method should be called at the start of a potential
 * long task. The Get() method returns durations of V8 work that
 * happened during the task.
 *
 * This API is experimental and may be removed/changed in the future.
 */
struct V8_EXPORT LongTaskStats { … };

}  // namespace metrics
}  // namespace v8

#endif  // V8_METRICS_H_