v8/tools/parse-processor.js

// Copyright 2017 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.
"use strict";


/**
 * A thin wrapper around shell's 'read' function showing a file name on error.
 */
function readFile(fileName) {
  try {
    return read(fileName);
  } catch (e) {
    console.log(fileName + ': ' + (e.message || e));
    throw e;
  }
}

// ===========================================================================

// This is the only true formatting, why? For an international audience the
// confusion between the decimal and thousands separator is big (alternating
// between comma "," vs dot "."). The Swiss formatting uses "'" as a thousands
// separator, dropping most of that confusion.
var numberFormat = new Intl.NumberFormat('de-CH', {
  maximumFractionDigits: 2,
  minimumFractionDigits: 2,
});

function formatNumber(value) {
  return formatNumber(value);
}

function BYTES(bytes, total) {
  let units = ['B ', 'kB', 'mB', 'gB'];
  let unitIndex = 0;
  let value = bytes;
  while (value > 1000 && unitIndex < units.length) {
    value /= 1000;
    unitIndex++;
  }
  let result = formatNumber(value).padStart(10) + ' ' + units[unitIndex];
  if (total !== void 0 && total != 0) {
    result += PERCENT(bytes, total).padStart(5);
  }
  return result;
}

function PERCENT(value, total) {
  return Math.round(value / total * 100) + "%";
}

function timestampMin(list) {
  let result = -1;
  list.forEach(timestamp => {
    if (result === -1) {
      result = timestamp;
    } else if (timestamp != -1) {
      result = Math.min(result, timestamp);
    }
  });
  return Math.round(result);
}


// ===========================================================================
class Script {
  constructor(file, id) {
    this.file = file;
    this.isNative = false;
    this.id = id;
    if (id === void 0 || id <= 0) {
      throw new Error(`Invalid id=${id} for script with file='${file}'`);
    }
    this.isEval = false;
    this.funktions = [];
    this.metrics = new Map();
    this.maxNestingLevel = 0;

    this.firstEvent = -1;
    this.firstParseEvent = -1;
    this.lastParseEvent = -1;
    this.executionTimestamp = -1;
    this.compileTimestamp = -1;
    this.lastEvent = -1;

    this.compileTime = -0.0;

    this.width = 0;
    this.bytesTotal = 0;
    this.ownBytes = -1;
    this.finalized = false;
    this.summary = '';
    this.setFile(file);
  }

  setFile(name) {
    this.file = name;
    this.isNative = name.startsWith('native ');
  }

  isEmpty() {
    return this.funktions.length === 0
  }

  funktionAtPosition(start) {
    if (start === 0) throw "position 0 is reserved for the script";
    if (this.finalized) throw 'Finalized script has no source position!';
    return this.funktions[start];
  }

  addMissingFunktions(list) {
    if (this.finalized) throw 'script is finalized!';
    list.forEach(fn => {
      if (this.funktions[fn.start] === void 0) {
        this.addFunktion(fn);
      }
    });
  }

  addFunktion(fn) {
    if (this.finalized) throw 'script is finalized!';
    if (fn.start === void 0) throw "Funktion has no start position";
    if (this.funktions[fn.start] !== void 0) {
      fn.print();
      throw "adding same function twice to script";
    }
    this.funktions[fn.start] = fn;
  }

  finalize() {
    this.finalized = true;
    // Compact funktions as we no longer need access via start byte position.
    this.funktions = this.funktions.filter(each => true);
    let parent = null;
    let maxNesting = 0;
    // Iterate over the Funktions in byte position order.
    this.funktions.forEach(fn => {
      fn.fromEval = this.isEval;
      if (parent === null) {
        parent = fn;
      } else {
        // Walk up the nested chain of Funktions to find the parent.
        while (parent !== null && !fn.isNestedIn(parent)) {
          parent = parent.parent;
        }
        fn.parent = parent;
        if (parent) {
          maxNesting = Math.max(maxNesting, parent.addNestedFunktion(fn));
        }
        parent = fn;
      }
      this.firstParseEvent = this.firstParseEvent === -1 ?
        fn.getFirstParseEvent() :
        Math.min(this.firstParseEvent, fn.getFirstParseEvent());
      this.lastParseEvent =
        Math.max(this.lastParseEvent, fn.getLastParseEvent());
      fn.getFirstEvent();
      if (Number.isNaN(this.lastEvent)) throw "Invalid lastEvent";
      this.lastEvent = Math.max(this.lastEvent, fn.getLastEvent());
      if (Number.isNaN(this.lastEvent)) throw "Invalid lastEvent";
    });
    this.maxNestingLevel = maxNesting;
    this.getFirstEvent();
  }

  print() {
    console.log(this.toString());
  }

  toString() {
    let str = `SCRIPT id=${this.id} file=${this.file}\n` +
      `functions[${this.funktions.length}]:`;
    this.funktions.forEach(fn => str += fn.toString());
    return str;
  }

  getBytes() {
    return this.bytesTotal;
  }

  getOwnBytes() {
    if (this.ownBytes === -1) {
      this.ownBytes = this.funktions.reduce(
        (bytes, each) => bytes - each.parent == null ? each.getBytes() : 0,
        this.getBytes());
      if (this.ownBytes < 0) throw "Own bytes must be positive";
    }
    return this.ownBytes;
  }

  // Also see Funktion.prototype.getMetricBytes
  getMetricBytes(name) {
    if (name == 'lazyCompileTimestamp') return this.getOwnBytes();
    return this.getBytes();
  }

  getMetricTime(name) {
    return this[name];
  }

  forEach(fn) {
    fn(this);
    this.funktions.forEach(fn);
  }

  // Container helper for TotalScript / Script.
  getScripts() {
    return [this];
  }

  calculateMetrics(printSummary) {
    let log = (str) => this.summary += str + '\n';
    log("SCRIPT: " + this.id);
    let all = this.funktions;
    if (all.length === 0) return;

    let nofFunktions = all.length;
    let ownBytesSum = list => {
      return list.reduce((bytes, each) => bytes + each.getOwnBytes(), 0)
    };

    let info = (name, funktions) => {
      let ownBytes = ownBytesSum(funktions);
      let nofPercent = Math.round(funktions.length / nofFunktions * 100);
      let value = (funktions.length + "").padStart(6) +
        (nofPercent + "%").padStart(5) +
        BYTES(ownBytes, this.bytesTotal).padStart(10);
      log(("  - " + name).padEnd(20) + value);
      this.metrics.set(name + "-bytes", ownBytes);
      this.metrics.set(name + "-count", funktions.length);
      this.metrics.set(name + "-count-percent", nofPercent);
      this.metrics.set(name + "-bytes-percent",
        Math.round(ownBytes / this.bytesTotal * 100));
    };

    log("  - file:         " + this.file);
    info("scripts", this.getScripts());
    info("functions", all);
    info("toplevel fn", all.filter(each => each.isToplevel()));
    info("preparsed", all.filter(each => each.preparseTime > 0));


    info("fully parsed", all.filter(each => each.parseTime > 0));
    // info("fn parsed", all.filter(each => each.parse2Time > 0));
    // info("resolved", all.filter(each => each.resolutionTime > 0));
    info("executed", all.filter(each => each.executionTimestamp > 0));
    info("forEval", all.filter(each => each.fromEval));
    info("lazy compiled", all.filter(each => each.lazyCompileTimestamp > 0));
    info("eager compiled", all.filter(each => each.compileTimestamp > 0));

    let parsingCost = new ExecutionCost('parse', all,
      each => each.parseTime);
    parsingCost.setMetrics(this.metrics);
    log(parsingCost.toString())

    let preParsingCost = new ExecutionCost('preparse', all,
      each => each.preparseTime);
    preParsingCost.setMetrics(this.metrics);
    log(preParsingCost.toString())

    let resolutionCost = new ExecutionCost('resolution', all,
      each => each.resolutionTime);
    resolutionCost.setMetrics(this.metrics);
    log(resolutionCost.toString())

    let nesting = new NestingDistribution(all);
    nesting.setMetrics(this.metrics);
    log(nesting.toString())

    if (printSummary) console.log(this.summary);
  }

  getAccumulatedTimeMetrics(metrics, start, end, delta, incremental = false) {
    // Returns an array of the following format:
    // [ [start, acc(metric0, start, start), acc(metric1, ...), ...],
    //   [start+delta, acc(metric0, start, start+delta), ...],
    //   [start+delta*2, acc(metric0, start, start+delta*2), ...],
    //   ...
    // ]
    const timespan = end - start;
    const kSteps = Math.ceil(timespan / delta);
    // To reduce the time spent iterating over the funktions of this script
    // we iterate once over all funktions and add the metric changes to each
    // timepoint:
    // [ [0, 300, ...], [1, 15, ...], [2, 100, ...], [3, 0, ...] ... ]
    // In a second step we accumulate all values:
    // [ [0, 300, ...], [1, 315, ...], [2, 415, ...], [3, 415, ...] ... ]
    //
    // To limit the number of data points required in the resulting graphs,
    // only the rows for entries with actual changes are created.

    const metricProperties = ["time"];
    metrics.forEach(each => {
      metricProperties.push(each + 'Timestamp');
      metricProperties.push(each + 'Time');
    });
    // Create a packed {rowTemplate} which is copied later-on.
    let indexToTime = (t) => (start + t * delta) / kSecondsToMillis;
    let rowTemplate = [indexToTime(0)];
    for (let i = 1; i < metricProperties.length; i++) rowTemplate.push(0.0);
    // Create rows with 0-time entry.
    let rows = new Array(rowTemplate.slice());
    for (let t = 1; t <= kSteps; t++) rows.push(null);
    // Create the real metric's property name on the Funktion object.
    // Add the increments of each Funktion's metric to the result.
    this.forEach(funktionOrScript => {
      // Iterate over the Funktion's metric names, position 0 is the time.
      for (let i = 1; i < metricProperties.length; i += 2) {
        let property = metricProperties[i];
        let timestamp = funktionOrScript[property];
        if (timestamp === void 0) continue;
        if (timestamp < 0 || end < timestamp) continue;
        let index = Math.floor(timestamp / delta);
        let row = rows[index];
        if (row === null) {
          // Add a new row if it didn't exist,
          row = rows[index] = rowTemplate.slice();
          // .. add the time offset.
          row[0] = indexToTime(index);
        }
        // Add the metric value.
        row[i] += funktionOrScript.getMetricBytes(property);
        let timeMetricName = metricProperties[i + 1];
        row[i + 1] += funktionOrScript.getMetricTime(timeMetricName);
      }
    });
    // Create a packed array again with only the valid entries.
    // Accumulate the incremental results by adding the metric values from
    // the previous time window.
    let previous = rows[0];
    let result = [previous];
    for (let t = 1; t < rows.length; t++) {
      let current = rows[t];
      if (current === null) {
        // Ensure a zero data-point after each non-zero point.
        if (incremental && rows[t - 1] !== null) {
          let duplicate = rowTemplate.slice();
          duplicate[0] = indexToTime(t);
          result.push(duplicate);
        }
        continue;
      }
      if (!incremental) {
        // Skip i==0 where the corresponding time value in seconds is.
        for (let i = 1; i < metricProperties.length; i++) {
          current[i] += previous[i];
        }
      }
      // Make sure we have a data-point in time right before the current one.
      if (rows[t - 1] === null) {
        let duplicate = (incremental ? rowTemplate : previous).slice();
        duplicate[0] = indexToTime(t - 1);
        result.push(duplicate);
      }
      previous = current;
      result.push(current);
    }
    // Make sure there is an entry at the last position to make sure all graphs
    // have the same width.
    const lastIndex = rows.length - 1;
    if (rows[lastIndex] === null) {
      let duplicate = previous.slice();
      duplicate[0] = indexToTime(lastIndex);
      result.push(duplicate);
    }
    return result;
  }

  getFunktionsAtTime(time, delta, metric) {
    // Returns a list of Funktions whose metric changed in the
    // [time-delta, time+delta] range.
    return this.funktions.filter(
      funktion => funktion.didMetricChange(time, delta, metric));
    return result;
  }

  getFirstEvent() {
    if (this.firstEvent === -1) {
      // TODO(cbruni): add support for network request timestanp
      this.firstEvent = this.firstParseEvent;
    }
    return this.firstEvent;
  }
}


class TotalScript extends Script {
  constructor() {
    super('all files', 'all files');
    this.scripts = [];
  }

  addAllFunktions(script) {
    // funktions is indexed by byte offset and as such not packed. Add every
    // Funktion one by one to keep this.funktions packed.
    script.funktions.forEach(fn => this.funktions.push(fn));
    this.scripts.push(script);
    this.bytesTotal += script.bytesTotal;
  }

  // Iterate over all Scripts and nested Funktions.
  forEach(fn) {
    this.scripts.forEach(script => script.forEach(fn));
  }

  getScripts() {
    return this.scripts;
  }
}


// ===========================================================================

class NestingDistribution {
  constructor(funktions) {
    // Stores the nof bytes per function nesting level.
    this.accumulator = [0, 0, 0, 0, 0];
    // Max nof bytes encountered at any nesting level.
    this.max = 0;
    // avg bytes per nesting level.
    this.avg = 0;
    this.totalBytes = 0;

    funktions.forEach(each => each.accumulateNestingLevel(this.accumulator));
    this.max = this.accumulator.reduce((max, each) => Math.max(max, each), 0);
    this.totalBytes = this.accumulator.reduce((sum, each) => sum + each, 0);
    for (let i = 0; i < this.accumulator.length; i++) {
      this.avg += this.accumulator[i] * i;
    }
    this.avg /= this.totalBytes;
  }

  print() {
    console.log(this.toString())
  }

  toString() {
    let ticks = " ▁▂▃▄▅▆▇█";
    let accString = this.accumulator.reduce((str, each) => {
      let index = Math.round(each / this.max * (ticks.length - 1));
      return str + ticks[index];
    }, '');
    let percent0 = this.accumulator[0]
    let percent1 = this.accumulator[1];
    let percent2plus = this.accumulator.slice(2)
      .reduce((sum, each) => sum + each, 0);
    return "  - nesting level:      " +
      ' avg=' + formatNumber(this.avg) +
      ' l0=' + PERCENT(percent0, this.totalBytes) +
      ' l1=' + PERCENT(percent1, this.totalBytes) +
      ' l2+=' + PERCENT(percent2plus, this.totalBytes) +
      ' distribution=[' + accString + ']';

  }

  setMetrics(dict) {}
}

class ExecutionCost {
  constructor(prefix, funktions, time_fn) {
    this.prefix = prefix;
    // Time spent on executed functions.
    this.executedCost = 0
    // Time spent on not executed functions.
    this.nonExecutedCost = 0;

    this.executedCost = funktions.reduce((sum, each) => {
      return sum + (each.hasBeenExecuted() ? time_fn(each) : 0)
    }, 0);
    this.nonExecutedCost = funktions.reduce((sum, each) => {
      return sum + (each.hasBeenExecuted() ? 0 : time_fn(each))
    }, 0);

  }

  print() {
    console.log(this.toString())
  }

  toString() {
    return ('  - ' + this.prefix + '-time:').padEnd(24) +
      (" executed=" + formatNumber(this.executedCost) + 'ms').padEnd(20) +
      " non-executed=" + formatNumber(this.nonExecutedCost) + 'ms';
  }

  setMetrics(dict) {
    dict.set('parseMetric', this.executionCost);
    dict.set('parseMetricNegative', this.nonExecutionCost);
  }
}

// ===========================================================================
const kNoTimeMetrics = {
  __proto__: null,
  executionTime: 0,
  firstEventTimestamp: 0,
  firstParseEventTimestamp: 0,
  lastParseTimestamp: 0,
  lastEventTimestamp: 0
};

class Funktion {
  constructor(name, start, end, script) {
    if (start < 0) throw "invalid start position: " + start;
    if (end <= 0) throw "invalid end position: " + end;
    if (end <= start) throw "invalid start end positions";

    this.name = name;
    this.start = start;
    this.end = end;
    this.ownBytes = -1;
    this.script = script;
    this.parent = null;
    this.fromEval = false;
    this.nested = [];
    this.nestingLevel = 0;

    this.preparseTimestamp = -1;
    this.parseTimestamp = -1;
    this.parse2Timestamp = -1;
    this.resolutionTimestamp = -1;
    this.lazyCompileTimestamp = -1;
    this.compileTimestamp = -1;
    this.executionTimestamp = -1;

    this.preparseTime = -0.0;
    this.parseTime = -0.0;
    this.parse2Time = -0.0;
    this.resolutionTime = -0.0;
    this.scopeResolutionTime = -0.0;
    this.lazyCompileTime = -0.0;
    this.compileTime = -0.0;

    // Lazily computed properties.
    this.firstEventTimestamp = -1;
    this.firstParseEventTimestamp = -1;
    this.lastParseTimestamp = -1;
    this.lastEventTimestamp = -1;

    if (script) this.script.addFunktion(this);
  }

  getMetricBytes(name) {
    if (name == 'lazyCompileTimestamp') return this.getOwnBytes();
    return this.getBytes();
  }

  getMetricTime(name) {
    if (name in kNoTimeMetrics) return 0;
    return this[name];
  }

  getFirstEvent() {
    if (this.firstEventTimestamp === -1) {
      this.firstEventTimestamp = timestampMin(
        [this.parseTimestamp, this.preparseTimestamp,
          this.resolutionTimestamp, this.executionTimestamp
        ]);
      if (!(this.firstEventTimestamp > 0)) {
        this.firstEventTimestamp = 0;
      }
    }
    return this.firstEventTimestamp;
  }

  getFirstParseEvent() {
    if (this.firstParseEventTimestamp === -1) {
      this.firstParseEventTimestamp = timestampMin(
        [this.parseTimestamp, this.preparseTimestamp,
          this.resolutionTimestamp
        ]);
      if (!(this.firstParseEventTimestamp > 0)) {
        this.firstParseEventTimestamp = 0;
      }
    }
    return this.firstParseEventTimestamp;
  }

  getLastParseEvent() {
    if (this.lastParseTimestamp === -1) {
      this.lastParseTimestamp = Math.max(
        this.preparseTimestamp + this.preparseTime,
        this.parseTimestamp + this.parseTime,
        this.resolutionTimestamp + this.resolutionTime);
      if (!(this.lastParseTimestamp > 0)) {
        this.lastParseTimestamp = 0;
      }
    }
    return this.lastParseTimestamp;
  }

  getLastEvent() {
    if (this.lastEventTimestamp === -1) {
      this.lastEventTimestamp = Math.max(
        this.getLastParseEvent(), this.executionTimestamp);
      if (!(this.lastEventTimestamp > 0)) {
        this.lastEventTimestamp = 0;
      }
    }
    return this.lastEventTimestamp;
  }

  isNestedIn(funktion) {
    if (this.script != funktion.script) throw "Incompatible script";
    return funktion.start < this.start && this.end <= funktion.end;
  }

  isToplevel() {
    return this.parent === null
  }

  hasBeenExecuted() {
    return this.executionTimestamp > 0
  }

  accumulateNestingLevel(accumulator) {
    let value = accumulator[this.nestingLevel] || 0;
    accumulator[this.nestingLevel] = value + this.getOwnBytes();
  }

  addNestedFunktion(child) {
    if (this.script != child.script) throw "Incompatible script";
    if (child == null) throw "Nesting non child";
    this.nested.push(child);
    if (this.nested.length > 1) {
      // Make sure the nested children don't overlap and have been inserted in
      // byte start position order.
      let last = this.nested[this.nested.length - 2];
      if (last.end > child.start || last.start > child.start ||
        last.end > child.end || last.start > child.end) {
        throw "Wrongly nested child added";
      }
    }
    child.nestingLevel = this.nestingLevel + 1;
    return child.nestingLevel;
  }

  getBytes() {
    return this.end - this.start;
  }

  getOwnBytes() {
    if (this.ownBytes === -1) {
      this.ownBytes = this.nested.reduce(
        (bytes, each) => bytes - each.getBytes(),
        this.getBytes());
      if (this.ownBytes < 0) throw "Own bytes must be positive";
    }
    return this.ownBytes;
  }

  didMetricChange(time, delta, name) {
    let value = this[name + 'Timestamp'];
    return (time - delta) <= value && value <= (time + delta);
  }

  print() {
    console.log(this.toString());
  }

  toString(details = true) {
    let result = 'function' + (this.name ? ' ' + this.name : '') +
      `() range=${this.start}-${this.end}`;
    if (details) result += ` script=${this.script ? this.script.id : 'X'}`;
    return result;
  }
}


// ===========================================================================

const kTimestampFactor = 1000;
const kSecondsToMillis = 1000;

function toTimestamp(microseconds) {
  return microseconds / kTimestampFactor
}

function startOf(timestamp, time) {
  let result = toTimestamp(timestamp) - time;
  if (result < 0) throw "start timestamp cannnot be negative";
  return result;
}


class ParseProcessor extends LogReader {
  constructor() {
    super();
    let config = (processor) => {
      // {script file},{script id},{start position},{end position},
      // {time},{timestamp},{function name}
      return {
        parsers: [null, parseInt, parseInt, parseInt, parseFloat, parseInt, null],
        processor: processor
      }
    };

    this.dispatchTable_ = {
      'parse-full': config(this.processFull),
      'parse-function': config(this.processFunction),
      'parse-script': config(this.processScript),
      'parse-eval': config(this.processEval),
      'preparse-no-resolution': config(this.processPreparseNoResolution),
      'preparse-resolution': config(this.processPreparseResolution),
      'first-execution': config(this.processFirstExecution),
      'compile-lazy': config(this.processCompileLazy),
      'compile': config(this.processCompile)
    };

    this.idToScript = new Map();
    this.fileToScript = new Map();
    this.nameToFunction = new Map();
    this.scripts = [];
    this.totalScript = new TotalScript();
    this.firstEvent = -1;
    this.lastParseEvent = -1;
    this.lastEvent = -1;
  }

  print() {
    console.log("scripts:");
    this.idToScript.forEach(script => script.print());
  }

  processString(string) {
    let end = string.length;
    let current = 0;
    let next = 0;
    let line;
    let i = 0;
    let entry;
    while (current < end) {
      next = string.indexOf("\n", current);
      if (next === -1) break;
      i++;
      line = string.substring(current, next);
      current = next + 1;
      this.processLogLine(line);
    }
    this.postProcess();
  }

  processLogFile(fileName) {
    this.collectEntries = true
    this.lastLogFileName_ = fileName;
    var line;
    while (line = readline()) {
      this.processLogLine(line);
    }
    this.postProcess();
  }

  postProcess() {
    this.scripts = Array.from(this.idToScript.values())
      .filter(each => !each.isNative);

    this.scripts.forEach(script => script.finalize());
    this.scripts.forEach(script => script.calculateMetrics(false));

    this.firstEvent =
      timestampMin(this.scripts.map(each => each.firstEvent));
    this.lastParseEvent = this.scripts.reduce(
      (max, script) => Math.max(max, script.lastParseEvent), -1);
    this.lastEvent = this.scripts.reduce(
      (max, script) => Math.max(max, script.lastEvent), -1);

    this.scripts.forEach(script => this.totalScript.addAllFunktions(script));
    this.totalScript.calculateMetrics(true);
    const series = [
      ['firstParseEvent', 'Any Parse Event'],
      ['parse', 'Parsing'],
      ['preparse', 'Preparsing'],
      ['resolution', 'Preparsing with Var. Resolution'],
      ['lazyCompile', 'Lazy Compilation'],
      ['compile', 'Eager Compilation'],
      ['execution', 'First Execution'],
    ];
    let metrics = series.map(each => each[0]);
    this.totalScript.getAccumulatedTimeMetrics(metrics, 0, this.lastEvent, 10);
  };

  addEntry(entry) {
    this.entries.push(entry);
  }

  lookupScript(file, id) {
    // During preparsing we only have the temporary ranges and no script yet.
    let script;
    if (this.idToScript.has(id)) {
      script = this.idToScript.get(id);
    } else {
      script = new Script(file, id);
      this.idToScript.set(id, script);
    }
    if (file.length > 0 && script.file.length === 0) {
      script.setFile(file);
      this.fileToScript.set(file, script);
    }
    return script;
  }

  lookupFunktion(file, scriptId,
    startPosition, endPosition, time, timestamp, functionName) {
    let script = this.lookupScript(file, scriptId);
    let funktion = script.funktionAtPosition(startPosition);
    if (funktion === void 0) {
      funktion = new Funktion(functionName, startPosition, endPosition, script);
    }
    return funktion;
  }

  processEval(file, scriptId, startPosition,
    endPosition, time, timestamp, functionName) {
    let script = this.lookupScript(file, scriptId);
    script.isEval = true;
  }

  processFull(file, scriptId, startPosition,
    endPosition, time, timestamp, functionName) {
    let funktion = this.lookupFunktion(...arguments);
    // TODO(cbruni): this should never happen, emit differen event from the
    // parser.
    if (funktion.parseTimestamp > 0) return;
    funktion.parseTimestamp = startOf(timestamp, time);
    funktion.parseTime = time;
  }

  processFunction(file, scriptId, startPosition,
    endPosition, time, timestamp, functionName) {
    let funktion = this.lookupFunktion(...arguments);
    funktion.parseTimestamp = startOf(timestamp, time);
    funktion.parseTime = time;
  }

  processScript(file, scriptId, startPosition,
    endPosition, time, timestamp, functionName) {
    // TODO timestamp and time
    let script = this.lookupScript(file, scriptId);
    let ts = startOf(timestamp, time);
    script.parseTimestamp = ts;
    script.firstEventTimestamp = ts;
    script.firstParseEventTimestamp = ts;
    script.parseTime = time;
  }

  processPreparseResolution(file, scriptId,
    startPosition, endPosition, time, timestamp, functionName) {
    let funktion = this.lookupFunktion(...arguments);
    // TODO(cbruni): this should never happen, emit different event from the
    // parser.
    if (funktion.resolutionTimestamp > 0) return;
    funktion.resolutionTimestamp = startOf(timestamp, time);
    funktion.resolutionTime = time;
  }

  processPreparseNoResolution(file, scriptId,
    startPosition, endPosition, time, timestamp, functionName) {
    let funktion = this.lookupFunktion(...arguments);
    funktion.preparseTimestamp = startOf(timestamp, time);
    funktion.preparseTime = time;
  }

  processFirstExecution(file, scriptId,
    startPosition, endPosition, time, timestamp, functionName) {
    let script = this.lookupScript(file, scriptId);
    if (startPosition === 0) {
      // undefined = eval fn execution
      if (script) {
        script.executionTimestamp = toTimestamp(timestamp);
      }
    } else {
      let funktion = script.funktionAtPosition(startPosition);
      if (funktion) {
        funktion.executionTimestamp = toTimestamp(timestamp);
      } else if (functionName.length > 0) {
        // throw new Error("Could not find function: " + functionName);
      }
    }
  }

  processCompileLazy(file, scriptId,
    startPosition, endPosition, time, timestamp, functionName) {
    let funktion = this.lookupFunktion(...arguments);
    funktion.lazyCompileTimestamp = startOf(timestamp, time);
    funktion.lazyCompileTime = time;
    script.firstPar
  }

  processCompile(file, scriptId,
    startPosition, endPosition, time, timestamp, functionName) {

    let script = this.lookupScript(file, scriptId);
    if (startPosition === 0) {
      script.compileTimestamp = startOf(timestamp, time);
      script.compileTime = time;
      script.bytesTotal = endPosition;
    } else {
      let funktion = script.funktionAtPosition(startPosition);
      funktion.compileTimestamp = startOf(timestamp, time);
      funktion.compileTime = time;
    }
  }
}


class ArgumentsProcessor extends BaseArgumentsProcessor {
  getArgsDispatch() {
    return {};
  }

  getDefaultResults() {
    return {
      logFileName: 'v8.log',
      range: 'auto,auto',
    };
  }
}