src/v8/tools/map-processor-driver.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.

function processArguments(args) {
  var processor = new ArgumentsProcessor(args);
  if (processor.parse()) {
    return processor.result();
  } else {
    processor.printUsageAndExit();
  }
}

function initSourceMapSupport() {
  // Pull dev tools source maps into our name space.
  SourceMap = WebInspector.SourceMap;

  // Overwrite the load function to load scripts synchronously.
  SourceMap.load = function(sourceMapURL) {
    var content = readFile(sourceMapURL);
    var sourceMapObject = (JSON.parse(content));
    return new SourceMap(sourceMapURL, sourceMapObject);
  };
}

var params = processArguments(arguments);
var sourceMap = null;
if (params.sourceMap) {
  initSourceMapSupport();
  sourceMap = SourceMap.load(params.sourceMap);
}
var mapProcessor = new MapProcessor();
mapProcessor.processLogFile(params.logFileName);