chrome-devtools-frontend/front_end/sdk/HeapProfilerModel.js

Chrome DevTools UI

// Copyright 2020 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.

import {DebuggerModel} from './DebuggerModel.js';            // eslint-disable-line no-unused-vars
import {RemoteObject} from './RemoteObject.js';              // eslint-disable-line no-unused-vars
import {RuntimeModel} from './RuntimeModel.js';              // eslint-disable-line no-unused-vars
import {Capability, SDKModel, Target} from './SDKModel.js';  // eslint-disable-line no-unused-vars


export class HeapProfilerModel extends SDKModel {
  /**
   * @param {!Target} target
   */
  constructor(target) {
    super(target);
    target.registerHeapProfilerDispatcher(new HeapProfilerDispatcher(this));
    this._enabled = false;
    this._heapProfilerAgent = target.heapProfilerAgent();
    this._memoryAgent = target.memoryAgent();
    this._runtimeModel = /** @type {!RuntimeModel} */ (target.model(RuntimeModel));
    this._samplingProfilerDepth = 0;
  }

  /**
   * @return {!DebuggerModel}
   */
  debuggerModel() {
    return this._runtimeModel.debuggerModel();
  }

  /**
   * @return {!RuntimeModel}
   */
  runtimeModel() {
    return this._runtimeModel;
  }

  async enable() {
    if (this._enabled) {
      return;
    }

    this._enabled = true;
    await this._heapProfilerAgent.invoke_enable();
  }

  /**
   * @param {number=} samplingRateInBytes
   * @returns {!Promise<boolean>}
   */
  async startSampling(samplingRateInBytes) {
    if (this._samplingProfilerDepth++) {
      return false;
    }
    const defaultSamplingIntervalInBytes = 16384;
    const response = await this._heapProfilerAgent.invoke_startSampling(
        {samplingInterval: samplingRateInBytes || defaultSamplingIntervalInBytes});
    return Boolean(response.getError());
  }

  /**
   * @return {!Promise<?Protocol.HeapProfiler.SamplingHeapProfile>}
   */
  async stopSampling() {
    if (!this._samplingProfilerDepth) {
      throw new Error('Sampling profiler is not running.');
    }
    if (--this._samplingProfilerDepth) {
      return this.getSamplingProfile();
    }
    const response = await this._heapProfilerAgent.invoke_stopSampling();
    if (response.getError()) {
      return null;
    }
    return response.profile;
  }

  /**
   * @return {!Promise<?Protocol.HeapProfiler.SamplingHeapProfile>}
   */
  async getSamplingProfile() {
    const response = await this._heapProfilerAgent.invoke_getSamplingProfile();
    if (response.getError()) {
      return null;
    }
    return response.profile;
  }

  /**
   * @return {!Promise<boolean>}
   */
  async collectGarbage() {
    const response = await this._heapProfilerAgent.invoke_collectGarbage();
    return Boolean(response.getError());
  }

  /**
   * @param {string} objectId
   * @return {!Promise<?string>}
   */
  async snapshotObjectIdForObjectId(objectId) {
    const response = await this._heapProfilerAgent.invoke_getHeapObjectId({objectId});
    if (response.getError()) {
      return null;
    }
    return response.heapSnapshotObjectId;
  }

  /**
   * @param {string} snapshotObjectId
   * @param {string} objectGroupName
   * @return {!Promise<?RemoteObject>}
   */
  async objectForSnapshotObjectId(snapshotObjectId, objectGroupName) {
    const result = await this._heapProfilerAgent.invoke_getObjectByHeapObjectId(
        {objectId: snapshotObjectId, objectGroup: objectGroupName});
    if (result.getError()) {
      return null;
    }
    return this._runtimeModel.createRemoteObject(result.result);
  }

  /**
   * @param {string} snapshotObjectId
   * @return {!Promise<boolean>}
   */
  async addInspectedHeapObject(snapshotObjectId) {
    const response = await this._heapProfilerAgent.invoke_addInspectedHeapObject({heapObjectId: snapshotObjectId});
    return Boolean(response.getError());
  }

  /**
   * @param {boolean} reportProgress
   * @param {boolean} treatGlobalObjectsAsRoots
   * @return {!Promise<void>}
   */
  async takeHeapSnapshot(reportProgress, treatGlobalObjectsAsRoots) {
    await this._heapProfilerAgent.invoke_takeHeapSnapshot({reportProgress, treatGlobalObjectsAsRoots});
  }

  /**
   * @param {boolean} recordAllocationStacks
   * @return {!Promise<boolean>}
   */
  async startTrackingHeapObjects(recordAllocationStacks) {
    const response =
        await this._heapProfilerAgent.invoke_startTrackingHeapObjects({trackAllocations: recordAllocationStacks});
    return Boolean(response.getError());
  }

  /**
   * @param {boolean} reportProgress
   * @return {!Promise<boolean>}
   */
  async stopTrackingHeapObjects(reportProgress) {
    const response = await this._heapProfilerAgent.invoke_stopTrackingHeapObjects({reportProgress});
    return Boolean(response.getError());
  }

  /**
   * @param {!Array<number>} samples
   */
  heapStatsUpdate(samples) {
    this.dispatchEventToListeners(Events.HeapStatsUpdate, samples);
  }

  /**
   * @param {number} lastSeenObjectId
   * @param {number} timestamp
   */
  lastSeenObjectId(lastSeenObjectId, timestamp) {
    this.dispatchEventToListeners(Events.LastSeenObjectId, {lastSeenObjectId: lastSeenObjectId, timestamp: timestamp});
  }

  /**
   * @param {string} chunk
   */
  addHeapSnapshotChunk(chunk) {
    this.dispatchEventToListeners(Events.AddHeapSnapshotChunk, chunk);
  }

  /**
   * @param {number} done
   * @param {number} total
   * @param {boolean=} finished
   */
  reportHeapSnapshotProgress(done, total, finished) {
    this.dispatchEventToListeners(Events.ReportHeapSnapshotProgress, {done: done, total: total, finished: finished});
  }

  resetProfiles() {
    this.dispatchEventToListeners(Events.ResetProfiles, this);
  }
}

/** @enum {symbol} */
export const Events = {
  HeapStatsUpdate: Symbol('HeapStatsUpdate'),
  LastSeenObjectId: Symbol('LastSeenObjectId'),
  AddHeapSnapshotChunk: Symbol('AddHeapSnapshotChunk'),
  ReportHeapSnapshotProgress: Symbol('ReportHeapSnapshotProgress'),
  ResetProfiles: Symbol('ResetProfiles')
};

/** @typedef {!{functionName: string, url: string, scriptId: (Protocol.Runtime.ScriptId|undefined), lineNumber: (number|undefined), columnNumber: (number|undefined)}} */
// @ts-ignore typedef
export let NativeProfilerCallFrame;  // eslint-disable-line no-unused-vars

/** @typedef {!{callFrame: !NativeProfilerCallFrame, selfSize: number, id: (number|undefined), children: Array<!CommonHeapProfileNode>}} */
// @ts-ignore typedef
export let CommonHeapProfileNode;  // eslint-disable-line no-unused-vars

/** @typedef {!{head:!CommonHeapProfileNode, modules:!Array<!Protocol.Memory.Module>}} */
// @ts-ignore typedef
export let CommonHeapProfile;  // eslint-disable-line no-unused-vars

/**
 * @implements {ProtocolProxyApi.HeapProfilerDispatcher}
 */
class HeapProfilerDispatcher {
  /**
   * @param {!HeapProfilerModel} model
   */
  constructor(model) {
    this._heapProfilerModel = model;
  }

  /**
   * @override
   * @param {!Protocol.HeapProfiler.HeapStatsUpdateEvent} event
   */
  heapStatsUpdate({statsUpdate}) {
    this._heapProfilerModel.heapStatsUpdate(statsUpdate);
  }

  /**
   * @override
   * @param {!Protocol.HeapProfiler.LastSeenObjectIdEvent} event
   */
  lastSeenObjectId({lastSeenObjectId, timestamp}) {
    this._heapProfilerModel.lastSeenObjectId(lastSeenObjectId, timestamp);
  }

  /**
   * @override
   * @param {!Protocol.HeapProfiler.AddHeapSnapshotChunkEvent} event
   */
  addHeapSnapshotChunk({chunk}) {
    this._heapProfilerModel.addHeapSnapshotChunk(chunk);
  }

  /**
   * @override
   * @param {!Protocol.HeapProfiler.ReportHeapSnapshotProgressEvent} event
   */
  reportHeapSnapshotProgress({done, total, finished}) {
    this._heapProfilerModel.reportHeapSnapshotProgress(done, total, finished);
  }

  /**
   * @override
   */
  resetProfiles() {
    this._heapProfilerModel.resetProfiles();
  }
}

/** @typedef {!{callFrame: !NativeProfilerCallFrame, selfSize: number, childMap: !Map<string, !NodeForConstruction>}} */
// @ts-ignore typedef
let NodeForConstruction;  // eslint-disable-line no-unused-vars

SDKModel.register(HeapProfilerModel, Capability.JS, false);