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Copyright 2014 The Chromium Authors. All rights reserved.\n// Use of this source code is governed by a BSD-style license that can be\n// found in the LICENSE file.\n\nimport * as Platform from '../../core/platform/platform.js';\nimport type * as Protocol from '../../generated/protocol.js';\n\nimport {ProfileNode, ProfileTreeModel} from './ProfileTreeModel.js';\n\nexport class CPUProfileNode extends ProfileNode {\n override id: number;\n override self: number;\n // Position ticks are available in profile nodes coming from CDP\n // profiles and not in those coming from tracing. They are used to\n // calculate the line level execution time shown in the Sources panel\n // after recording a profile. For trace CPU profiles we use the\n // `lines` array instead.\n positionTicks: Protocol.Profiler.PositionTickInfo[]|undefined;\n override deoptReason: string|null;\n\n constructor(node: Protocol.Profiler.ProfileNode, samplingInterval: number /* milliseconds */) {\n const callFrame = node.callFrame || ({\n // TODO(crbug.com/1172300) Ignored during the jsdoc to ts migration\n // @ts-expect-error\n functionName: node['functionName'],\n // TODO(crbug.com/1172300) Ignored during the jsdoc to ts migration\n // @ts-expect-error\n scriptId: node['scriptId'],\n // TODO(crbug.com/1172300) Ignored during the jsdoc to ts migration\n // @ts-expect-error\n url: node['url'],\n // TODO(crbug.com/1172300) Ignored during the jsdoc to ts migration\n // @ts-expect-error\n lineNumber: node['lineNumber'] - 1,\n // TODO(crbug.com/1172300) Ignored during the jsdoc to ts migration\n // @ts-expect-error\n columnNumber: node['columnNumber'] - 1,\n } as Protocol.Runtime.CallFrame);\n super(callFrame);\n this.id = node.id;\n this.self = (node.hitCount || 0) * samplingInterval;\n this.positionTicks = node.positionTicks;\n // Compatibility: legacy backends could provide \"no reason\" for optimized functions.\n this.deoptReason = node.deoptReason && node.deoptReason !== 'no reason' ? node.deoptReason : null;\n }\n}\n\nexport class CPUProfileDataModel extends ProfileTreeModel {\n profileStartTime: number /* milliseconds */;\n profileEndTime: number /* milliseconds */;\n timestamps: number[];\n samples: number[]|undefined;\n /**\n * Contains trace ids assigned to samples, if any. Trace ids are\n * keyed by the sample index in the profile. These are only created\n * for CPU profiles coming from traces.\n */\n traceIds?: Record;\n lines?: number[];\n totalHitCount: number;\n profileHead: CPUProfileNode;\n /**\n * A cache for the nodes we have parsed.\n * Note: \"Parsed\" nodes are different from the \"Protocol\" nodes, the\n * latter being the raw data we receive from the backend.\n */\n #idToParsedNode!: Map;\n gcNode?: ProfileNode;\n programNode?: ProfileNode;\n idleNode?: ProfileNode;\n #stackStartTimes?: number[];\n #stackChildrenDuration?: number[];\n constructor(profile: ExtendedProfile) {\n super();\n // @ts-expect-error Legacy types\n const isLegacyFormat = Boolean(profile['head']);\n if (isLegacyFormat) {\n // Legacy format contains raw timestamps and start/stop times are in seconds.\n this.profileStartTime = profile.startTime * 1000;\n this.profileEndTime = profile.endTime * 1000;\n // @ts-expect-error Legacy types\n this.timestamps = profile.timestamps;\n this.compatibilityConversionHeadToNodes(profile);\n } else {\n // Current format encodes timestamps as deltas. Start/stop times are in microseconds.\n this.profileStartTime = profile.startTime / 1000;\n this.profileEndTime = profile.endTime / 1000;\n this.timestamps = this.convertTimeDeltas(profile);\n }\n this.traceIds = profile.traceIds;\n this.samples = profile.samples;\n\n // Lines are available only in profiles coming from tracing.\n // Elements in the lines array have a 1 to 1 correspondence with\n // samples, by array position. They can be 1 or 0 and indicate if\n // there is line data for a given sample, i.e. if a given sample\n // needs to be included to calculate the line level execution time\n // data, which we show in the sources panel after recording a\n // profile.\n this.lines = profile.lines;\n this.totalHitCount = 0;\n this.profileHead = this.translateProfileTree(profile.nodes);\n this.initialize(this.profileHead);\n this.extractMetaNodes();\n if (this.samples?.length) {\n this.sortSamples();\n this.normalizeTimestamps();\n this.fixMissingSamples();\n }\n }\n\n private compatibilityConversionHeadToNodes(profile: Protocol.Profiler.Profile): void {\n // @ts-expect-error Legacy types\n if (!profile.head || profile.nodes) {\n return;\n }\n const nodes: Protocol.Profiler.ProfileNode[] = [];\n // @ts-expect-error Legacy types\n convertNodesTree(profile.head);\n profile.nodes = nodes;\n // @ts-expect-error Legacy types\n delete profile.head;\n function convertNodesTree(node: Protocol.Profiler.ProfileNode): number {\n nodes.push(node);\n // @ts-expect-error Legacy types\n node.children = (node.children as Protocol.Profiler.ProfileNode[]).map(convertNodesTree);\n return node.id;\n }\n }\n\n /**\n * Calculate timestamps using timeDeltas. Some CPU profile formats,\n * like the ones contained in traces have timeDeltas instead of\n * timestamps.\n */\n private convertTimeDeltas(profile: Protocol.Profiler.Profile): number[] {\n if (!profile.timeDeltas) {\n return [];\n }\n let lastTimeMicroSec = profile.startTime;\n const timestamps = new Array(profile.timeDeltas.length);\n for (let i = 0; i < profile.timeDeltas.length; ++i) {\n lastTimeMicroSec += profile.timeDeltas[i];\n timestamps[i] = lastTimeMicroSec;\n }\n return timestamps;\n }\n\n /**\n * Creates a Tree of CPUProfileNodes using the Protocol.Profiler.ProfileNodes.\n * As the tree is built, samples of native code (prefixed with \"native \") are\n * filtered out. Samples of filtered nodes are replaced with the parent of the\n * node being filtered.\n *\n * This function supports legacy and new definitions of the CDP Profiler.Profile\n * type.\n */\n private translateProfileTree(nodes: Protocol.Profiler.ProfileNode[]): CPUProfileNode {\n function buildChildrenFromParents(nodes: Protocol.Profiler.ProfileNode[]): void {\n if (nodes[0].children) {\n return;\n }\n nodes[0].children = [];\n for (let i = 1; i < nodes.length; ++i) {\n const node = nodes[i];\n // @ts-expect-error Legacy types\n const parentNode = protocolNodeById.get(node.parent);\n if (!parentNode) {\n continue;\n }\n if (parentNode.children) {\n parentNode.children.push(node.id);\n } else {\n parentNode.children = [node.id];\n }\n }\n }\n\n /**\n * Calculate how many times each node was sampled in the profile, if\n * not available in the profile data.\n */\n function buildHitCountFromSamples(nodes: Protocol.Profiler.ProfileNode[], samples: number[]|undefined): void {\n // If hit count is available, this profile has the new format, so\n // no need to continue.`\n if (typeof (nodes[0].hitCount) === 'number') {\n return;\n }\n if (!samples) {\n throw new Error('Error: Neither hitCount nor samples are present in profile.');\n }\n for (let i = 0; i < nodes.length; ++i) {\n nodes[i].hitCount = 0;\n }\n for (let i = 0; i < samples.length; ++i) {\n const node = protocolNodeById.get(samples[i]);\n if (node?.hitCount === undefined) {\n continue;\n }\n node.hitCount++;\n }\n }\n\n // A cache for the raw nodes received from the traces / CDP.\n const protocolNodeById = new Map();\n for (let i = 0; i < nodes.length; ++i) {\n const node = nodes[i];\n protocolNodeById.set(node.id, node);\n }\n\n buildHitCountFromSamples(nodes, this.samples);\n buildChildrenFromParents(nodes);\n this.totalHitCount = nodes.reduce((acc, node) => acc + (node.hitCount || 0), 0);\n const sampleTime = (this.profileEndTime - this.profileStartTime) / this.totalHitCount;\n const root = nodes[0];\n // If a node is filtered out, its samples are replaced with its parent,\n // so we keep track of the which id to use in the samples data.\n const idToUseForRemovedNode = new Map([[root.id, root.id]]);\n this.#idToParsedNode = new Map();\n\n const resultRoot = new CPUProfileNode(root, sampleTime);\n this.#idToParsedNode.set(root.id, resultRoot);\n if (!root.children) {\n throw new Error('Missing children for root');\n }\n const parentNodeStack = root.children.map(() => resultRoot);\n const sourceNodeStack = root.children.map(id => protocolNodeById.get(id));\n while (sourceNodeStack.length) {\n let parentNode = parentNodeStack.pop();\n const sourceNode = sourceNodeStack.pop();\n if (!sourceNode || !parentNode) {\n continue;\n }\n if (!sourceNode.children) {\n sourceNode.children = [];\n }\n const targetNode = new CPUProfileNode(sourceNode, sampleTime);\n parentNode.children.push(targetNode);\n parentNode = targetNode;\n\n idToUseForRemovedNode.set(sourceNode.id, parentNode.id);\n parentNodeStack.push.apply(parentNodeStack, sourceNode.children.map(() => parentNode));\n sourceNodeStack.push.apply(sourceNodeStack, sourceNode.children.map(id => protocolNodeById.get(id)));\n this.#idToParsedNode.set(sourceNode.id, targetNode);\n }\n if (this.samples) {\n this.samples = this.samples.map(id => idToUseForRemovedNode.get(id) as number);\n }\n return resultRoot;\n }\n\n /**\n * Sorts the samples array using the timestamps array (there is a one\n * to one matching by index between the two).\n */\n private sortSamples(): void {\n if (!this.timestamps || !this.samples) {\n return;\n }\n\n const timestamps = this.timestamps;\n const samples = this.samples;\n const orderedIndices = timestamps.map((_x, index) => index);\n orderedIndices.sort((a, b) => timestamps[a] - timestamps[b]);\n\n this.timestamps = [];\n this.samples = [];\n\n for (let i = 0; i < orderedIndices.length; i++) {\n const orderedIndex = orderedIndices[i];\n this.timestamps.push(timestamps[orderedIndex]);\n this.samples.push(samples[orderedIndex]);\n }\n }\n\n /**\n * Fills in timestamps and/or time deltas from legacy profiles where\n * they could be missing.\n */\n private normalizeTimestamps(): void {\n if (!this.samples) {\n return;\n }\n let timestamps: number[] = this.timestamps;\n if (!timestamps) {\n // Support loading CPU profiles that are missing timestamps and\n // timedeltas\n const profileStartTime = this.profileStartTime;\n const interval = (this.profileEndTime - profileStartTime) / this.samples.length;\n // Add an extra timestamp used to calculate the last sample duration.\n timestamps = new Array(this.samples.length + 1);\n for (let i = 0; i < timestamps.length; ++i) {\n timestamps[i] = profileStartTime + i * interval;\n }\n this.timestamps = timestamps;\n return;\n }\n\n // Convert samples from micro to milliseconds\n for (let i = 0; i < timestamps.length; ++i) {\n timestamps[i] /= 1000;\n }\n if (this.samples.length === timestamps.length) {\n // Add an extra timestamp used to calculate the last sample duration.\n const lastTimestamp = timestamps.at(-1) || 0;\n const averageIntervalTime = (lastTimestamp - timestamps[0]) / (timestamps.length - 1);\n this.timestamps.push(lastTimestamp + averageIntervalTime);\n }\n this.profileStartTime = timestamps.at(0) || this.profileStartTime;\n this.profileEndTime = timestamps.at(-1) || this.profileEndTime;\n }\n\n /**\n * Some nodes do not refer to JS samples but to V8 system tasks, AKA\n * \"meta\" nodes. This function extracts those nodes from the profile.\n */\n private extractMetaNodes(): void {\n const topLevelNodes = this.profileHead.children;\n for (let i = 0; i < topLevelNodes.length && !(this.gcNode && this.programNode && this.idleNode); i++) {\n const node = topLevelNodes[i];\n if (node.functionName === '(garbage collector)') {\n this.gcNode = node;\n } else if (node.functionName === '(program)') {\n this.programNode = node;\n } else if (node.functionName === '(idle)') {\n this.idleNode = node;\n }\n }\n }\n\n private fixMissingSamples(): void {\n // Sometimes the V8 sampler is not able to parse the JS stack and returns\n // a (program) sample instead. The issue leads to call frames being split\n // apart when they shouldn't.\n // Here's a workaround for that. When there's a single (program) sample\n // between two call stacks sharing the same bottom node, it is replaced\n // with the preceding sample.\n const samples = this.samples;\n if (!samples) {\n return;\n }\n const samplesCount = samples.length;\n if (!this.programNode || samplesCount < 3) {\n return;\n }\n const idToNode = this.#idToParsedNode;\n const programNodeId = this.programNode.id;\n const gcNodeId = this.gcNode ? this.gcNode.id : -1;\n const idleNodeId = this.idleNode ? this.idleNode.id : -1;\n let prevNodeId: number = samples[0];\n let nodeId: number = samples[1];\n for (let sampleIndex = 1; sampleIndex < samplesCount - 1; sampleIndex++) {\n const nextNodeId = samples[sampleIndex + 1];\n const prevNode = idToNode.get(prevNodeId);\n const nextNode = idToNode.get(nextNodeId);\n if (prevNodeId === undefined || nextNodeId === undefined || !prevNode || !nextNode) {\n console.error(`Unexpectedly found undefined nodes: ${prevNodeId} ${nextNodeId}`);\n continue;\n }\n if (nodeId === programNodeId && !isSystemNode(prevNodeId) && !isSystemNode(nextNodeId) &&\n bottomNode(prevNode) === bottomNode(nextNode)) {\n samples[sampleIndex] = prevNodeId;\n }\n prevNodeId = nodeId;\n nodeId = nextNodeId;\n }\n function bottomNode(node: ProfileNode): ProfileNode {\n while (node.parent?.parent) {\n node = node.parent;\n }\n return node;\n }\n function isSystemNode(nodeId: number): boolean {\n return nodeId === programNodeId || nodeId === gcNodeId || nodeId === idleNodeId;\n }\n }\n\n /**\n * Traverses the call tree derived from the samples calling back when a call is opened\n * and when it's closed\n */\n forEachFrame(\n openFrameCallback: (depth: number, node: ProfileNode, sampleIndex: number, timestamp: number) => void,\n closeFrameCallback:\n (depth: number, node: ProfileNode, sampleIndex: number, timestamp: number, dur: number,\n selfTime: number) => void,\n startTime?: number, stopTime?: number): void {\n if (!this.profileHead || !this.samples) {\n return;\n }\n\n startTime = startTime || 0;\n stopTime = stopTime || Infinity;\n const samples = this.samples;\n const timestamps = this.timestamps;\n const idToNode = this.#idToParsedNode;\n const gcNode = this.gcNode;\n const samplesCount = samples.length;\n const startIndex =\n Platform.ArrayUtilities.lowerBound(timestamps, startTime, Platform.ArrayUtilities.DEFAULT_COMPARATOR);\n let stackTop = 0;\n const stackNodes: ProfileNode[] = [];\n let prevId: number = this.profileHead.id;\n let sampleTime;\n let gcParentNode: ProfileNode|null = null;\n\n // Extra slots for gc being put on top,\n // and one at the bottom to allow safe stackTop-1 access.\n const stackDepth = this.maxDepth + 3;\n if (!this.#stackStartTimes) {\n this.#stackStartTimes = new Array(stackDepth);\n }\n const stackStartTimes = this.#stackStartTimes;\n if (!this.#stackChildrenDuration) {\n this.#stackChildrenDuration = new Array(stackDepth);\n }\n const stackChildrenDuration = this.#stackChildrenDuration;\n\n let node;\n let sampleIndex;\n for (sampleIndex = startIndex; sampleIndex < samplesCount; sampleIndex++) {\n sampleTime = timestamps[sampleIndex];\n if (sampleTime >= stopTime) {\n break;\n }\n const id = samples[sampleIndex];\n if (id === prevId) {\n continue;\n }\n node = idToNode.get(id);\n let prevNode: ProfileNode|null = idToNode.get(prevId) || null;\n if (!prevNode) {\n continue;\n }\n\n if (gcNode && node === gcNode) {\n // GC samples have no stack, so we just put GC node on top of the last recorded sample.\n gcParentNode = prevNode;\n openFrameCallback(gcParentNode.depth + 1, gcNode, sampleIndex, sampleTime);\n stackStartTimes[++stackTop] = sampleTime;\n stackChildrenDuration[stackTop] = 0;\n prevId = id;\n continue;\n }\n if (gcNode && prevNode === gcNode && gcParentNode) {\n // end of GC frame\n const start = stackStartTimes[stackTop];\n const duration = sampleTime - start;\n stackChildrenDuration[stackTop - 1] += duration;\n closeFrameCallback(\n gcParentNode.depth + 1, gcNode, sampleIndex, start, duration, duration - stackChildrenDuration[stackTop]);\n --stackTop;\n prevNode = gcParentNode;\n prevId = prevNode.id;\n gcParentNode = null;\n }\n\n // If the depth of this node is greater than the depth of the\n // previous one, new calls happened in between and we need to open\n // them, so track all of them in stackNodes.\n while (node && node.depth > prevNode.depth) {\n stackNodes.push(node);\n node = node.parent;\n }\n\n // If `prevNode` differs from `node`, the current sample was taken\n // after a change in the call stack, meaning that frames in the\n // path of `prevNode` that differ from those in the path of `node`\n // can be closed. So go down to the lowest common ancestor and\n // close current intervals.\n //\n // For example:\n //\n // prevNode node\n // | |\n // v v\n // [---D--]\n // [---C--][--E--]\n // [------B------] <- LCA\n // [------A------]\n //\n // Because a sample was taken with A, B and E in the stack, it\n // means C and D finished and we can close them.\n while (prevNode && prevNode !== node) {\n const start = stackStartTimes[stackTop];\n const duration = sampleTime - start;\n stackChildrenDuration[stackTop - 1] += duration;\n closeFrameCallback(\n prevNode.depth, prevNode, sampleIndex, start, duration, duration - stackChildrenDuration[stackTop]);\n --stackTop;\n // Track calls to open after previous calls were closed\n // In the example above, this would add E to the tracking stack.\n if (node && node.depth === prevNode.depth) {\n stackNodes.push(node);\n node = node.parent;\n }\n prevNode = prevNode.parent;\n }\n\n // Go up the nodes stack and open new intervals.\n while (stackNodes.length) {\n const currentNode = stackNodes.pop();\n if (!currentNode) {\n break;\n }\n node = currentNode;\n openFrameCallback(currentNode.depth, currentNode, sampleIndex, sampleTime);\n stackStartTimes[++stackTop] = sampleTime;\n stackChildrenDuration[stackTop] = 0;\n }\n\n prevId = id;\n }\n\n // Close remaining intervals.\n sampleTime = timestamps[sampleIndex] || this.profileEndTime;\n if (node && gcParentNode && idToNode.get(prevId) === gcNode) {\n const start = stackStartTimes[stackTop];\n const duration = sampleTime - start;\n stackChildrenDuration[stackTop - 1] += duration;\n closeFrameCallback(\n gcParentNode.depth + 1, node, sampleIndex, start, duration, duration - stackChildrenDuration[stackTop]);\n --stackTop;\n prevId = gcParentNode.id;\n }\n for (let node = idToNode.get(prevId); node?.parent; node = node.parent) {\n const start = stackStartTimes[stackTop];\n const duration = sampleTime - start;\n stackChildrenDuration[stackTop - 1] += duration;\n closeFrameCallback(node.depth, node, sampleIndex, start, duration, duration - stackChildrenDuration[stackTop]);\n --stackTop;\n }\n }\n /**\n * Returns the node that corresponds to a given index of a sample.\n */\n nodeByIndex(index: number): ProfileNode|null {\n return this.samples && this.#idToParsedNode.get(this.samples[index]) || null;\n }\n /**\n * Returns the node that corresponds to a given node id.\n */\n nodeById(nodeId: number): ProfileNode|null {\n return this.#idToParsedNode.get(nodeId) || null;\n }\n\n nodes(): ProfileNode[]|null {\n if (!this.#idToParsedNode) {\n return null;\n }\n return [...this.#idToParsedNode.values()];\n }\n}\n\n// Format used by profiles coming from traces.\nexport type ExtendedProfileNode = Protocol.Profiler.ProfileNode&{parent?: number};\nexport type ExtendedProfile = Protocol.Profiler.Profile&{\n nodes: Protocol.Profiler.ProfileNode[] | ExtendedProfileNode[],\n lines?: number[],\n /**\n * A sample can be manually collected with v8::CpuProfiler::collectSample.\n * When this is done an id (trace id) can be passed to the API to\n * identify the collected sample in the resulting CPU profile. We\n * do this for several trace events, to efficiently calculate their\n * stack trace and improve the JS flamechart we build. This property\n * contains the mapping of the trace ids with the shape traceId -> nodeId\n */\n traceIds?: Record,\n};\n"]}