Bug 935366 - Use source-map module instead of SourceMap.jsm. r=fitzgen
authorAlexandre Poirot <poirot.alex@gmail.com>
Thu, 06 Aug 2015 05:38:09 -0700
changeset 256685 a926fd3044b7dc7ec171340f6aad83bcf96ec7b4
parent 256684 9cfe7bf49cf28ce4aaf0c0e8e60c0d7382ab10ae
child 256686 a0d4ce93ef075c5b1a7441728bf434578bc396af
push id63400
push userkwierso@gmail.com
push dateFri, 07 Aug 2015 01:11:26 +0000
treeherdermozilla-inbound@efc97cd68267 [default view] [failures only]
perfherder[talos] [build metrics] [platform microbench] (compared to previous push)
reviewersfitzgen
bugs935366
milestone42.0a1
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nightly linux64
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nightly win32
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Bug 935366 - Use source-map module instead of SourceMap.jsm. r=fitzgen
browser/devtools/debugger/test/code_ugly-4.js
toolkit/devtools/Loader.jsm
toolkit/devtools/server/actors/pretty-print-worker.js
toolkit/devtools/server/actors/styleeditor.js
toolkit/devtools/server/actors/stylesheets.js
toolkit/devtools/server/tests/unit/test_blackboxing-06.js
toolkit/devtools/server/tests/unit/test_breakpoint-20.js
toolkit/devtools/server/tests/unit/test_sourcemaps-01.js
toolkit/devtools/server/tests/unit/test_sourcemaps-02.js
toolkit/devtools/server/tests/unit/test_sourcemaps-03.js
toolkit/devtools/server/tests/unit/test_sourcemaps-04.js
toolkit/devtools/server/tests/unit/test_sourcemaps-05.js
toolkit/devtools/server/tests/unit/test_sourcemaps-06.js
toolkit/devtools/server/tests/unit/test_sourcemaps-07.js
toolkit/devtools/server/tests/unit/test_sourcemaps-08.js
toolkit/devtools/server/tests/unit/test_sourcemaps-09.js
toolkit/devtools/server/tests/unit/test_sourcemaps-10.js
toolkit/devtools/server/tests/unit/test_sourcemaps-11.js
toolkit/devtools/server/tests/unit/test_sourcemaps-12.js
toolkit/devtools/server/tests/unit/test_sourcemaps-13.js
toolkit/devtools/sourcemap/SourceMap.jsm
toolkit/devtools/sourcemap/UPGRADING.md
toolkit/devtools/sourcemap/moz.build
toolkit/devtools/sourcemap/source-map.js
toolkit/devtools/sourcemap/tests/unit/Utils.jsm
toolkit/devtools/sourcemap/tests/unit/test_api.js
--- a/browser/devtools/debugger/test/code_ugly-4.js
+++ b/browser/devtools/debugger/test/code_ugly-4.js
@@ -1,15 +1,16 @@
 function a(){b()}function b(){debugger}
 //# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiYWJjLmpzIiwic291cmNlcyI6WyJkYXRhOnRleHQvamF2YXNjcmlwdCxmdW5jdGlvbiBhKCl7YigpfSIsImRhdGE6dGV4dC9qYXZhc2NyaXB0LGZ1bmN0aW9uIGIoKXtkZWJ1Z2dlcn0iXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IkFBQUEsaUJDQUEsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMifQ==
 
 // Generate this file by evaluating the following in a browser-environment
 // scratchpad:
 //
-//    Components.utils.import('resource://gre/modules/devtools/SourceMap.jsm');
+//    let { devtools } = Components.utils.import('resource://gre/modules/devtools/Loader.jsm', {});
+//    let { SourceNode } = devtools.require("source-map");
 //
 //    let dataUrl = s => "data:text/javascript," + s;
 //
 //    let A = "function a(){b()}";
 //    let A_URL = dataUrl(A);
 //    let B = "function b(){debugger}";
 //    let B_URL = dataUrl(B);
 //
--- a/toolkit/devtools/Loader.jsm
+++ b/toolkit/devtools/Loader.jsm
@@ -93,17 +93,17 @@ BuiltinProvider.prototype = {
         "devtools/async-utils": "resource://gre/modules/devtools/async-utils",
         "devtools/content-observer": "resource://gre/modules/devtools/content-observer",
         "gcli": "resource://gre/modules/devtools/gcli",
         "projecteditor": "resource:///modules/devtools/projecteditor",
         "promise": "resource://gre/modules/Promise-backend.js",
         "acorn": "resource://gre/modules/devtools/acorn",
         "acorn/util/walk": "resource://gre/modules/devtools/acorn/walk.js",
         "tern": "resource://gre/modules/devtools/tern",
-        "source-map": "resource://gre/modules/devtools/SourceMap.jsm",
+        "source-map": "resource://gre/modules/devtools/sourcemap/source-map.js",
 
         // Allow access to xpcshell test items from the loader.
         "xpcshell-test": "resource://test"
       },
       globals: this.globals,
       invisibleToDebugger: this.invisibleToDebugger,
       sharedGlobal: true,
       sharedGlobalBlacklist: sharedGlobalBlacklist
@@ -151,17 +151,17 @@ SrcdirProvider.prototype = {
     let asyncUtilsURI = this.fileURI(OS.Path.join(toolkitDir, "async-utils.js"));
     let contentObserverURI = this.fileURI(OS.Path.join(toolkitDir), "content-observer.js");
     let gcliURI = this.fileURI(OS.Path.join(toolkitDir, "gcli", "source", "lib", "gcli"));
     let projecteditorURI = this.fileURI(OS.Path.join(devtoolsDir, "projecteditor"));
     let promiseURI = this.fileURI(OS.Path.join(modulesDir, "Promise-backend.js"));
     let acornURI = this.fileURI(OS.Path.join(toolkitDir, "acorn"));
     let acornWalkURI = OS.Path.join(acornURI, "walk.js");
     let ternURI = OS.Path.join(toolkitDir, "tern");
-    let sourceMapURI = this.fileURI(OS.Path.join(toolkitDir), "SourceMap.jsm");
+    let sourceMapURI = this.fileURI(OS.Path.join(toolkitDir, "sourcemap", "source-map.js"));
     this.loader = new loader.Loader({
       id: "fx-devtools",
       modules: loaderModules,
       paths: {
         "": "resource://gre/modules/commonjs/",
         "main": mainURI,
         "definitions": definitionsURI,
         "devtools": devtoolsURI,
--- a/toolkit/devtools/server/actors/pretty-print-worker.js
+++ b/toolkit/devtools/server/actors/pretty-print-worker.js
@@ -24,17 +24,17 @@
  *
  * In the case of an error, the worker responds with a message of the form:
  *
  *     { id, error }
  */
 
 importScripts("resource://gre/modules/devtools/shared/worker-helper.js");
 importScripts("resource://gre/modules/devtools/acorn/acorn.js");
-importScripts("resource://gre/modules/devtools/source-map.js");
+importScripts("resource://gre/modules/devtools/sourcemap/source-map.js");
 importScripts("resource://gre/modules/devtools/pretty-fast.js");
 
 workerHelper.createTask(self, "pretty-print", ({ url, indent, source }) => {
   try {
     const prettified = prettyFast(source, {
       url: url,
       indent: " ".repeat(indent)
     });
--- a/toolkit/devtools/server/actors/styleeditor.js
+++ b/toolkit/devtools/server/actors/styleeditor.js
@@ -5,17 +5,16 @@
 "use strict";
 
 let { components, Cc, Ci, Cu } = require("chrome");
 let Services = require("Services");
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/NetUtil.jsm");
 Cu.import("resource://gre/modules/FileUtils.jsm");
-Cu.import("resource://gre/modules/devtools/SourceMap.jsm");
 
 const {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
 const events = require("sdk/event/core");
 const protocol = require("devtools/server/protocol");
 const {Arg, Option, method, RetVal, types} = protocol;
 const {LongStringActor, ShortLongString} = require("devtools/server/actors/string");
 const {fetch} = require("devtools/toolkit/DevToolsUtils");
 
--- a/toolkit/devtools/server/actors/stylesheets.js
+++ b/toolkit/devtools/server/actors/stylesheets.js
@@ -5,26 +5,26 @@
 "use strict";
 
 let { components, Cc, Ci, Cu } = require("chrome");
 let Services = require("Services");
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/NetUtil.jsm");
 Cu.import("resource://gre/modules/FileUtils.jsm");
-Cu.import("resource://gre/modules/devtools/SourceMap.jsm");
 Cu.import("resource://gre/modules/Task.jsm");
 
 const {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
 const events = require("sdk/event/core");
 const protocol = require("devtools/server/protocol");
 const {Arg, Option, method, RetVal, types} = protocol;
 const {LongStringActor, ShortLongString} = require("devtools/server/actors/string");
 const {fetch} = require("devtools/toolkit/DevToolsUtils");
 const {listenOnce} = require("devtools/async-utils");
+const {SourceMapConsumer} = require("source-map");
 
 loader.lazyGetter(this, "CssLogic", () => require("devtools/styleinspector/css-logic").CssLogic);
 
 let TRANSITION_CLASS = "moz-styleeditor-transitioning";
 let TRANSITION_DURATION_MS = 500;
 let TRANSITION_BUFFER_MS = 1000;
 let TRANSITION_RULE_SELECTOR =
 ".moz-styleeditor-transitioning:root, .moz-styleeditor-transitioning:root *";
--- a/toolkit/devtools/server/tests/unit/test_blackboxing-06.js
+++ b/toolkit/devtools/server/tests/unit/test_blackboxing-06.js
@@ -4,17 +4,17 @@
 /**
  * Test that we can black box source mapped sources.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
+const {SourceNode} = devtools.require("source-map");
 
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-black-box");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-black-box", function(aResponse, aTabClient, aThreadClient) {
--- a/toolkit/devtools/server/tests/unit/test_breakpoint-20.js
+++ b/toolkit/devtools/server/tests/unit/test_breakpoint-20.js
@@ -6,18 +6,16 @@
  * frame scripts), breakpoints get hit in scripts defined by all sources.
  */
 
 var gDebuggee;
 var gClient;
 var gTraceClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
-
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-breakpoints");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestThread(gClient, "test-breakpoints", testBreakpoint);
   });
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-01.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-01.js
@@ -4,17 +4,17 @@
 /**
  * Check basic source map integration with the "newSource" packet in the RDP.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
+const {SourceNode} = devtools.require("source-map");
 
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-02.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-02.js
@@ -4,17 +4,17 @@
 /**
  * Check basic source map integration with the "sources" packet in the RDP.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import("resource:///modules/devtools/SourceMap.jsm");
+const {SourceNode} = devtools.require("source-map");
 
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-03.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-03.js
@@ -4,17 +4,17 @@
 /**
  * Check setting breakpoints in source mapped sources.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
+const {SourceNode} = devtools.require("source-map");
 
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-04.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-04.js
@@ -4,18 +4,16 @@
 /**
  * Check that absolute source map urls work.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
-
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
       gThreadClient = aThreadClient;
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-05.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-05.js
@@ -4,18 +4,16 @@
 /**
  * Check that relative source map urls work.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
-
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
       gThreadClient = aThreadClient;
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-06.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-06.js
@@ -5,17 +5,17 @@
  * Check that we can load sources whose content is embedded in the
  * "sourcesContent" field of a source map.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import("resource:///modules/devtools/SourceMap.jsm");
+const {SourceNode} = devtools.require("source-map");
 
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-07.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-07.js
@@ -4,17 +4,17 @@
 /**
  * Test that we don't permanently cache sources from source maps.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import("resource:///modules/devtools/SourceMap.jsm");
+const {SourceNode} = devtools.require("source-map");
 
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-08.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-08.js
@@ -5,18 +5,16 @@
  * Regression test for bug 882986 regarding sourcesContent and absolute source
  * URLs.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import("resource:///modules/devtools/SourceMap.jsm");
-
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
       gThreadClient = aThreadClient;
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-09.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-09.js
@@ -4,18 +4,16 @@
 /**
  * Check that source maps and breakpoints work with minified javascript.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
-
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
       gThreadClient = aThreadClient;
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-10.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-10.js
@@ -4,17 +4,17 @@
 /**
  * Check that we source map frame locations for the frame we are paused at.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
+const {SourceNode} = devtools.require("source-map");
 
 function run_test() {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
       gThreadClient = aThreadClient;
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-11.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-11.js
@@ -4,17 +4,17 @@
 /**
  * Check that we source map frame locations returned by "frames" requests.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
+const {SourceNode} = devtools.require("source-map");
 
 function run_test() {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
       gThreadClient = aThreadClient;
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-12.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-12.js
@@ -5,17 +5,17 @@
  * Check that we continue stepping when a single original source's line
  * corresponds to multiple generated js lines.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
+const {SourceNode} = devtools.require("source-map");
 
 function run_test() {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
       gThreadClient = aThreadClient;
--- a/toolkit/devtools/server/tests/unit/test_sourcemaps-13.js
+++ b/toolkit/devtools/server/tests/unit/test_sourcemaps-13.js
@@ -5,17 +5,17 @@
  * Test that we don't permanently cache source maps across reloads.
  */
 
 var gDebuggee;
 var gClient;
 var gThreadClient;
 var gTabClient;
 
-Components.utils.import("resource:///modules/devtools/SourceMap.jsm");
+const {SourceNode} = devtools.require("source-map");
 
 function run_test()
 {
   initTestDebuggerServer();
   gDebuggee = addTestGlobal("test-source-map");
   gClient = new DebuggerClient(DebuggerServer.connectPipe());
   gClient.connect(function() {
     attachTestTabAndResume(gClient, "test-source-map", function(aResponse, aTabClient, aThreadClient) {
deleted file mode 100644
--- a/toolkit/devtools/sourcemap/SourceMap.jsm
+++ /dev/null
@@ -1,2906 +0,0 @@
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-
-/*
- * WARNING!
- *
- * Do not edit this file directly, it is built from the sources at
- * https://github.com/mozilla/source-map/
- */
-
-///////////////////////////////////////////////////////////////////////////////
-
-
-this.EXPORTED_SYMBOLS = [ "SourceMapConsumer", "SourceMapGenerator", "SourceNode" ];
-
-Components.utils.import("resource://gre/modules/devtools/Console.jsm");
-Components.utils.import('resource://gre/modules/devtools/Require.jsm');
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/source-map-consumer', ['require', 'exports', 'module' ,  'source-map/util', 'source-map/binary-search', 'source-map/array-set', 'source-map/base64-vlq', 'source-map/quick-sort'], function(require, exports, module) {
-
-  var util = require('source-map/util');
-  var binarySearch = require('source-map/binary-search');
-  var ArraySet = require('source-map/array-set').ArraySet;
-  var base64VLQ = require('source-map/base64-vlq');
-  var quickSort = require('source-map/quick-sort').quickSort;
-
-  function SourceMapConsumer(aSourceMap) {
-    var sourceMap = aSourceMap;
-    if (typeof aSourceMap === 'string') {
-      sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
-    }
-
-    return sourceMap.sections != null
-      ? new IndexedSourceMapConsumer(sourceMap)
-      : new BasicSourceMapConsumer(sourceMap);
-  }
-
-  SourceMapConsumer.fromSourceMap = function(aSourceMap) {
-    return BasicSourceMapConsumer.fromSourceMap(aSourceMap);
-  }
-
-  /**
-   * The version of the source mapping spec that we are consuming.
-   */
-  SourceMapConsumer.prototype._version = 3;
-
-  // `__generatedMappings` and `__originalMappings` are arrays that hold the
-  // parsed mapping coordinates from the source map's "mappings" attribute. They
-  // are lazily instantiated, accessed via the `_generatedMappings` and
-  // `_originalMappings` getters respectively, and we only parse the mappings
-  // and create these arrays once queried for a source location. We jump through
-  // these hoops because there can be many thousands of mappings, and parsing
-  // them is expensive, so we only want to do it if we must.
-  //
-  // Each object in the arrays is of the form:
-  //
-  //     {
-  //       generatedLine: The line number in the generated code,
-  //       generatedColumn: The column number in the generated code,
-  //       source: The path to the original source file that generated this
-  //               chunk of code,
-  //       originalLine: The line number in the original source that
-  //                     corresponds to this chunk of generated code,
-  //       originalColumn: The column number in the original source that
-  //                       corresponds to this chunk of generated code,
-  //       name: The name of the original symbol which generated this chunk of
-  //             code.
-  //     }
-  //
-  // All properties except for `generatedLine` and `generatedColumn` can be
-  // `null`.
-  //
-  // `_generatedMappings` is ordered by the generated positions.
-  //
-  // `_originalMappings` is ordered by the original positions.
-
-  SourceMapConsumer.prototype.__generatedMappings = null;
-  Object.defineProperty(SourceMapConsumer.prototype, '_generatedMappings', {
-    get: function () {
-      if (!this.__generatedMappings) {
-        this._parseMappings(this._mappings, this.sourceRoot);
-      }
-
-      return this.__generatedMappings;
-    }
-  });
-
-  SourceMapConsumer.prototype.__originalMappings = null;
-  Object.defineProperty(SourceMapConsumer.prototype, '_originalMappings', {
-    get: function () {
-      if (!this.__originalMappings) {
-        this._parseMappings(this._mappings, this.sourceRoot);
-      }
-
-      return this.__originalMappings;
-    }
-  });
-
-  SourceMapConsumer.prototype._charIsMappingSeparator =
-    function SourceMapConsumer_charIsMappingSeparator(aStr, index) {
-      var c = aStr.charAt(index);
-      return c === ";" || c === ",";
-    };
-
-  /**
-   * Parse the mappings in a string in to a data structure which we can easily
-   * query (the ordered arrays in the `this.__generatedMappings` and
-   * `this.__originalMappings` properties).
-   */
-  SourceMapConsumer.prototype._parseMappings =
-    function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
-      throw new Error("Subclasses must implement _parseMappings");
-    };
-
-  SourceMapConsumer.GENERATED_ORDER = 1;
-  SourceMapConsumer.ORIGINAL_ORDER = 2;
-
-  SourceMapConsumer.GREATEST_LOWER_BOUND = 1;
-  SourceMapConsumer.LEAST_UPPER_BOUND = 2;
-
-  /**
-   * Iterate over each mapping between an original source/line/column and a
-   * generated line/column in this source map.
-   *
-   * @param Function aCallback
-   *        The function that is called with each mapping.
-   * @param Object aContext
-   *        Optional. If specified, this object will be the value of `this` every
-   *        time that `aCallback` is called.
-   * @param aOrder
-   *        Either `SourceMapConsumer.GENERATED_ORDER` or
-   *        `SourceMapConsumer.ORIGINAL_ORDER`. Specifies whether you want to
-   *        iterate over the mappings sorted by the generated file's line/column
-   *        order or the original's source/line/column order, respectively. Defaults to
-   *        `SourceMapConsumer.GENERATED_ORDER`.
-   */
-  SourceMapConsumer.prototype.eachMapping =
-    function SourceMapConsumer_eachMapping(aCallback, aContext, aOrder) {
-      var context = aContext || null;
-      var order = aOrder || SourceMapConsumer.GENERATED_ORDER;
-
-      var mappings;
-      switch (order) {
-      case SourceMapConsumer.GENERATED_ORDER:
-        mappings = this._generatedMappings;
-        break;
-      case SourceMapConsumer.ORIGINAL_ORDER:
-        mappings = this._originalMappings;
-        break;
-      default:
-        throw new Error("Unknown order of iteration.");
-      }
-
-      var sourceRoot = this.sourceRoot;
-      mappings.map(function (mapping) {
-        var source = mapping.source === null ? null : this._sources.at(mapping.source);
-        if (source != null && sourceRoot != null) {
-          source = util.join(sourceRoot, source);
-        }
-        return {
-          source: source,
-          generatedLine: mapping.generatedLine,
-          generatedColumn: mapping.generatedColumn,
-          originalLine: mapping.originalLine,
-          originalColumn: mapping.originalColumn,
-          name: mapping.name === null ? null : this._names.at(mapping.name)
-        };
-      }, this).forEach(aCallback, context);
-    };
-
-  /**
-   * Returns all generated line and column information for the original source,
-   * line, and column provided. If no column is provided, returns all mappings
-   * corresponding to a either the line we are searching for or the next
-   * closest line that has any mappings. Otherwise, returns all mappings
-   * corresponding to the given line and either the column we are searching for
-   * or the next closest column that has any offsets.
-   *
-   * The only argument is an object with the following properties:
-   *
-   *   - source: The filename of the original source.
-   *   - line: The line number in the original source.
-   *   - column: Optional. the column number in the original source.
-   *
-   * and an array of objects is returned, each with the following properties:
-   *
-   *   - line: The line number in the generated source, or null.
-   *   - column: The column number in the generated source, or null.
-   */
-  SourceMapConsumer.prototype.allGeneratedPositionsFor =
-    function SourceMapConsumer_allGeneratedPositionsFor(aArgs) {
-      var line = util.getArg(aArgs, 'line');
-
-      // When there is no exact match, BasicSourceMapConsumer.prototype._findMapping
-      // returns the index of the closest mapping less than the needle. By
-      // setting needle.originalColumn to 0, we thus find the last mapping for
-      // the given line, provided such a mapping exists.
-      var needle = {
-        source: util.getArg(aArgs, 'source'),
-        originalLine: line,
-        originalColumn: util.getArg(aArgs, 'column', 0)
-      };
-
-      if (this.sourceRoot != null) {
-        needle.source = util.relative(this.sourceRoot, needle.source);
-      }
-      if (!this._sources.has(needle.source)) {
-        return [];
-      }
-      needle.source = this._sources.indexOf(needle.source);
-
-      var mappings = [];
-
-      var index = this._findMapping(needle,
-                                    this._originalMappings,
-                                    "originalLine",
-                                    "originalColumn",
-                                    util.compareByOriginalPositions,
-                                    binarySearch.LEAST_UPPER_BOUND);
-      if (index >= 0) {
-        var mapping = this._originalMappings[index];
-
-        if (aArgs.column === undefined) {
-          var originalLine = mapping.originalLine;
-
-          // Iterate until either we run out of mappings, or we run into
-          // a mapping for a different line than the one we found. Since
-          // mappings are sorted, this is guaranteed to find all mappings for
-          // the line we found.
-          while (mapping && mapping.originalLine === originalLine) {
-            mappings.push({
-              line: util.getArg(mapping, 'generatedLine', null),
-              column: util.getArg(mapping, 'generatedColumn', null),
-              lastColumn: util.getArg(mapping, 'lastGeneratedColumn', null)
-            });
-
-            mapping = this._originalMappings[++index];
-          }
-        } else {
-          var originalColumn = mapping.originalColumn;
-
-          // Iterate until either we run out of mappings, or we run into
-          // a mapping for a different line than the one we were searching for.
-          // Since mappings are sorted, this is guaranteed to find all mappings for
-          // the line we are searching for.
-          while (mapping &&
-                 mapping.originalLine === line &&
-                 mapping.originalColumn == originalColumn) {
-            mappings.push({
-              line: util.getArg(mapping, 'generatedLine', null),
-              column: util.getArg(mapping, 'generatedColumn', null),
-              lastColumn: util.getArg(mapping, 'lastGeneratedColumn', null)
-            });
-
-            mapping = this._originalMappings[++index];
-          }
-        }
-      }
-
-      return mappings;
-    };
-
-  exports.SourceMapConsumer = SourceMapConsumer;
-
-  /**
-   * A BasicSourceMapConsumer instance represents a parsed source map which we can
-   * query for information about the original file positions by giving it a file
-   * position in the generated source.
-   *
-   * The only parameter is the raw source map (either as a JSON string, or
-   * already parsed to an object). According to the spec, source maps have the
-   * following attributes:
-   *
-   *   - version: Which version of the source map spec this map is following.
-   *   - sources: An array of URLs to the original source files.
-   *   - names: An array of identifiers which can be referrenced by individual mappings.
-   *   - sourceRoot: Optional. The URL root from which all sources are relative.
-   *   - sourcesContent: Optional. An array of contents of the original source files.
-   *   - mappings: A string of base64 VLQs which contain the actual mappings.
-   *   - file: Optional. The generated file this source map is associated with.
-   *
-   * Here is an example source map, taken from the source map spec[0]:
-   *
-   *     {
-   *       version : 3,
-   *       file: "out.js",
-   *       sourceRoot : "",
-   *       sources: ["foo.js", "bar.js"],
-   *       names: ["src", "maps", "are", "fun"],
-   *       mappings: "AA,AB;;ABCDE;"
-   *     }
-   *
-   * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?pli=1#
-   */
-  function BasicSourceMapConsumer(aSourceMap) {
-    var sourceMap = aSourceMap;
-    if (typeof aSourceMap === 'string') {
-      sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
-    }
-
-    var version = util.getArg(sourceMap, 'version');
-    var sources = util.getArg(sourceMap, 'sources');
-    // Sass 3.3 leaves out the 'names' array, so we deviate from the spec (which
-    // requires the array) to play nice here.
-    var names = util.getArg(sourceMap, 'names', []);
-    var sourceRoot = util.getArg(sourceMap, 'sourceRoot', null);
-    var sourcesContent = util.getArg(sourceMap, 'sourcesContent', null);
-    var mappings = util.getArg(sourceMap, 'mappings');
-    var file = util.getArg(sourceMap, 'file', null);
-
-    // Once again, Sass deviates from the spec and supplies the version as a
-    // string rather than a number, so we use loose equality checking here.
-    if (version != this._version) {
-      throw new Error('Unsupported version: ' + version);
-    }
-
-    // Some source maps produce relative source paths like "./foo.js" instead of
-    // "foo.js".  Normalize these first so that future comparisons will succeed.
-    // See bugzil.la/1090768.
-    sources = sources.map(util.normalize);
-
-    // Pass `true` below to allow duplicate names and sources. While source maps
-    // are intended to be compressed and deduplicated, the TypeScript compiler
-    // sometimes generates source maps with duplicates in them. See Github issue
-    // #72 and bugzil.la/889492.
-    this._names = ArraySet.fromArray(names, true);
-    this._sources = ArraySet.fromArray(sources, true);
-
-    this.sourceRoot = sourceRoot;
-    this.sourcesContent = sourcesContent;
-    this._mappings = mappings;
-    this.file = file;
-  }
-
-  BasicSourceMapConsumer.prototype = Object.create(SourceMapConsumer.prototype);
-  BasicSourceMapConsumer.prototype.consumer = SourceMapConsumer;
-
-  /**
-   * Create a BasicSourceMapConsumer from a SourceMapGenerator.
-   *
-   * @param SourceMapGenerator aSourceMap
-   *        The source map that will be consumed.
-   * @returns BasicSourceMapConsumer
-   */
-  BasicSourceMapConsumer.fromSourceMap =
-    function SourceMapConsumer_fromSourceMap(aSourceMap) {
-      var smc = Object.create(BasicSourceMapConsumer.prototype);
-
-      var names = smc._names = ArraySet.fromArray(aSourceMap._names.toArray(), true);
-      var sources = smc._sources = ArraySet.fromArray(aSourceMap._sources.toArray(), true);
-      smc.sourceRoot = aSourceMap._sourceRoot;
-      smc.sourcesContent = aSourceMap._generateSourcesContent(smc._sources.toArray(),
-                                                              smc.sourceRoot);
-      smc.file = aSourceMap._file;
-
-      // Because we are modifying the entries (by converting string sources and
-      // names to indices into the sources and names ArraySets), we have to make
-      // a copy of the entry or else bad things happen. Shared mutable state
-      // strikes again! See github issue #191.
-
-      var generatedMappings = aSourceMap._mappings.toArray().slice();
-      var destGeneratedMappings = smc.__generatedMappings = [];
-      var destOriginalMappings = smc.__originalMappings = [];
-
-      for (var i = 0, length = generatedMappings.length; i < length; i++) {
-        var srcMapping = generatedMappings[i];
-        var destMapping = new Mapping;
-        destMapping.generatedLine = srcMapping.generatedLine;
-        destMapping.generatedColumn = srcMapping.generatedColumn;
-
-        if (srcMapping.source) {
-          destMapping.source = sources.indexOf(srcMapping.source);
-          destMapping.originalLine = srcMapping.originalLine;
-          destMapping.originalColumn = srcMapping.originalColumn;
-
-          if (srcMapping.name) {
-            destMapping.name = names.indexOf(srcMapping.name);
-          }
-
-          destOriginalMappings.push(destMapping);
-        }
-
-        destGeneratedMappings.push(destMapping);
-      }
-
-      quickSort(smc.__originalMappings, util.compareByOriginalPositions);
-
-      return smc;
-    };
-
-  /**
-   * The version of the source mapping spec that we are consuming.
-   */
-  BasicSourceMapConsumer.prototype._version = 3;
-
-  /**
-   * The list of original sources.
-   */
-  Object.defineProperty(BasicSourceMapConsumer.prototype, 'sources', {
-    get: function () {
-      return this._sources.toArray().map(function (s) {
-        return this.sourceRoot != null ? util.join(this.sourceRoot, s) : s;
-      }, this);
-    }
-  });
-
-  /**
-   * Provide the JIT with a nice shape / hidden class.
-   */
-  function Mapping() {
-    this.generatedLine = 0;
-    this.generatedColumn = 0;
-    this.source = null;
-    this.originalLine = null;
-    this.originalColumn = null;
-    this.name = null;
-  }
-
-  /**
-   * Parse the mappings in a string in to a data structure which we can easily
-   * query (the ordered arrays in the `this.__generatedMappings` and
-   * `this.__originalMappings` properties).
-   */
-  BasicSourceMapConsumer.prototype._parseMappings =
-    function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
-      var generatedLine = 1;
-      var previousGeneratedColumn = 0;
-      var previousOriginalLine = 0;
-      var previousOriginalColumn = 0;
-      var previousSource = 0;
-      var previousName = 0;
-      var length = aStr.length;
-      var index = 0;
-      var cachedSegments = {};
-      var temp = {};
-      var originalMappings = [];
-      var generatedMappings = [];
-      var mapping, str, segment, end, value;
-
-      while (index < length) {
-        if (aStr.charAt(index) === ';') {
-          generatedLine++;
-          index++;
-          previousGeneratedColumn = 0;
-        }
-        else if (aStr.charAt(index) === ',') {
-          index++;
-        }
-        else {
-          mapping = new Mapping();
-          mapping.generatedLine = generatedLine;
-
-          // Because each offset is encoded relative to the previous one,
-          // many segments often have the same encoding. We can exploit this
-          // fact by caching the parsed variable length fields of each segment,
-          // allowing us to avoid a second parse if we encounter the same
-          // segment again.
-          for (end = index; end < length; end++) {
-            if (this._charIsMappingSeparator(aStr, end)) {
-              break;
-            }
-          }
-          str = aStr.slice(index, end);
-
-          segment = cachedSegments[str];
-          if (segment) {
-            index += str.length;
-          } else {
-            segment = [];
-            while (index < end) {
-              base64VLQ.decode(aStr, index, temp);
-              value = temp.value;
-              index = temp.rest;
-              segment.push(value);
-            }
-
-            if (segment.length === 2) {
-              throw new Error('Found a source, but no line and column');
-            }
-
-            if (segment.length === 3) {
-              throw new Error('Found a source and line, but no column');
-            }
-
-            cachedSegments[str] = segment;
-          }
-
-          // Generated column.
-          mapping.generatedColumn = previousGeneratedColumn + segment[0];
-          previousGeneratedColumn = mapping.generatedColumn;
-
-          if (segment.length > 1) {
-            // Original source.
-            mapping.source = previousSource + segment[1];
-            previousSource += segment[1];
-
-            // Original line.
-            mapping.originalLine = previousOriginalLine + segment[2];
-            previousOriginalLine = mapping.originalLine;
-            // Lines are stored 0-based
-            mapping.originalLine += 1;
-
-            // Original column.
-            mapping.originalColumn = previousOriginalColumn + segment[3];
-            previousOriginalColumn = mapping.originalColumn;
-
-            if (segment.length > 4) {
-              // Original name.
-              mapping.name = previousName + segment[4];
-              previousName += segment[4];
-            }
-          }
-
-          generatedMappings.push(mapping);
-          if (typeof mapping.originalLine === 'number') {
-            originalMappings.push(mapping);
-          }
-        }
-      }
-
-      quickSort(generatedMappings, util.compareByGeneratedPositionsDeflated);
-      this.__generatedMappings = generatedMappings;
-
-      quickSort(originalMappings, util.compareByOriginalPositions);
-      this.__originalMappings = originalMappings;
-    };
-
-  /**
-   * Find the mapping that best matches the hypothetical "needle" mapping that
-   * we are searching for in the given "haystack" of mappings.
-   */
-  BasicSourceMapConsumer.prototype._findMapping =
-    function SourceMapConsumer_findMapping(aNeedle, aMappings, aLineName,
-                                           aColumnName, aComparator, aBias) {
-      // To return the position we are searching for, we must first find the
-      // mapping for the given position and then return the opposite position it
-      // points to. Because the mappings are sorted, we can use binary search to
-      // find the best mapping.
-
-      if (aNeedle[aLineName] <= 0) {
-        throw new TypeError('Line must be greater than or equal to 1, got '
-                            + aNeedle[aLineName]);
-      }
-      if (aNeedle[aColumnName] < 0) {
-        throw new TypeError('Column must be greater than or equal to 0, got '
-                            + aNeedle[aColumnName]);
-      }
-
-      return binarySearch.search(aNeedle, aMappings, aComparator, aBias);
-    };
-
-  /**
-   * Compute the last column for each generated mapping. The last column is
-   * inclusive.
-   */
-  BasicSourceMapConsumer.prototype.computeColumnSpans =
-    function SourceMapConsumer_computeColumnSpans() {
-      for (var index = 0; index < this._generatedMappings.length; ++index) {
-        var mapping = this._generatedMappings[index];
-
-        // Mappings do not contain a field for the last generated columnt. We
-        // can come up with an optimistic estimate, however, by assuming that
-        // mappings are contiguous (i.e. given two consecutive mappings, the
-        // first mapping ends where the second one starts).
-        if (index + 1 < this._generatedMappings.length) {
-          var nextMapping = this._generatedMappings[index + 1];
-
-          if (mapping.generatedLine === nextMapping.generatedLine) {
-            mapping.lastGeneratedColumn = nextMapping.generatedColumn - 1;
-            continue;
-          }
-        }
-
-        // The last mapping for each line spans the entire line.
-        mapping.lastGeneratedColumn = Infinity;
-      }
-    };
-
-  /**
-   * Returns the original source, line, and column information for the generated
-   * source's line and column positions provided. The only argument is an object
-   * with the following properties:
-   *
-   *   - line: The line number in the generated source.
-   *   - column: The column number in the generated source.
-   *   - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
-   *     'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
-   *     closest element that is smaller than or greater than the one we are
-   *     searching for, respectively, if the exact element cannot be found.
-   *     Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
-   *
-   * and an object is returned with the following properties:
-   *
-   *   - source: The original source file, or null.
-   *   - line: The line number in the original source, or null.
-   *   - column: The column number in the original source, or null.
-   *   - name: The original identifier, or null.
-   */
-  BasicSourceMapConsumer.prototype.originalPositionFor =
-    function SourceMapConsumer_originalPositionFor(aArgs) {
-      var needle = {
-        generatedLine: util.getArg(aArgs, 'line'),
-        generatedColumn: util.getArg(aArgs, 'column')
-      };
-
-      var index = this._findMapping(
-        needle,
-        this._generatedMappings,
-        "generatedLine",
-        "generatedColumn",
-        util.compareByGeneratedPositionsDeflated,
-        util.getArg(aArgs, 'bias', SourceMapConsumer.GREATEST_LOWER_BOUND)
-      );
-
-      if (index >= 0) {
-        var mapping = this._generatedMappings[index];
-
-        if (mapping.generatedLine === needle.generatedLine) {
-          var source = util.getArg(mapping, 'source', null);
-          if (source !== null) {
-            source = this._sources.at(source);
-            if (this.sourceRoot != null) {
-              source = util.join(this.sourceRoot, source);
-            }
-          }
-          var name = util.getArg(mapping, 'name', null);
-          if (name !== null) {
-            name = this._names.at(name);
-          }
-          return {
-            source: source,
-            line: util.getArg(mapping, 'originalLine', null),
-            column: util.getArg(mapping, 'originalColumn', null),
-            name: name
-          };
-        }
-      }
-
-      return {
-        source: null,
-        line: null,
-        column: null,
-        name: null
-      };
-    };
-
-  /**
-   * Return true if we have the source content for every source in the source
-   * map, false otherwise.
-   */
-  BasicSourceMapConsumer.prototype.hasContentsOfAllSources =
-    function BasicSourceMapConsumer_hasContentsOfAllSources() {
-      if (!this.sourcesContent) {
-        return false;
-      }
-      return this.sourcesContent.length >= this._sources.size() &&
-        !this.sourcesContent.some(function (sc) { return sc == null; });
-    };
-
-  /**
-   * Returns the original source content. The only argument is the url of the
-   * original source file. Returns null if no original source content is
-   * availible.
-   */
-  BasicSourceMapConsumer.prototype.sourceContentFor =
-    function SourceMapConsumer_sourceContentFor(aSource, nullOnMissing) {
-      if (!this.sourcesContent) {
-        return null;
-      }
-
-      if (this.sourceRoot != null) {
-        aSource = util.relative(this.sourceRoot, aSource);
-      }
-
-      if (this._sources.has(aSource)) {
-        return this.sourcesContent[this._sources.indexOf(aSource)];
-      }
-
-      var url;
-      if (this.sourceRoot != null
-          && (url = util.urlParse(this.sourceRoot))) {
-        // XXX: file:// URIs and absolute paths lead to unexpected behavior for
-        // many users. We can help them out when they expect file:// URIs to
-        // behave like it would if they were running a local HTTP server. See
-        // https://bugzilla.mozilla.org/show_bug.cgi?id=885597.
-        var fileUriAbsPath = aSource.replace(/^file:\/\//, "");
-        if (url.scheme == "file"
-            && this._sources.has(fileUriAbsPath)) {
-          return this.sourcesContent[this._sources.indexOf(fileUriAbsPath)]
-        }
-
-        if ((!url.path || url.path == "/")
-            && this._sources.has("/" + aSource)) {
-          return this.sourcesContent[this._sources.indexOf("/" + aSource)];
-        }
-      }
-
-      // This function is used recursively from
-      // IndexedSourceMapConsumer.prototype.sourceContentFor. In that case, we
-      // don't want to throw if we can't find the source - we just want to
-      // return null, so we provide a flag to exit gracefully.
-      if (nullOnMissing) {
-        return null;
-      }
-      else {
-        throw new Error('"' + aSource + '" is not in the SourceMap.');
-      }
-    };
-
-  /**
-   * Returns the generated line and column information for the original source,
-   * line, and column positions provided. The only argument is an object with
-   * the following properties:
-   *
-   *   - source: The filename of the original source.
-   *   - line: The line number in the original source.
-   *   - column: The column number in the original source.
-   *   - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
-   *     'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
-   *     closest element that is smaller than or greater than the one we are
-   *     searching for, respectively, if the exact element cannot be found.
-   *     Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
-   *
-   * and an object is returned with the following properties:
-   *
-   *   - line: The line number in the generated source, or null.
-   *   - column: The column number in the generated source, or null.
-   */
-  BasicSourceMapConsumer.prototype.generatedPositionFor =
-    function SourceMapConsumer_generatedPositionFor(aArgs) {
-      var source = util.getArg(aArgs, 'source');
-      if (this.sourceRoot != null) {
-        source = util.relative(this.sourceRoot, source);
-      }
-      if (!this._sources.has(source)) {
-        return {
-          line: null,
-          column: null,
-          lastColumn: null
-        };
-      }
-      source = this._sources.indexOf(source);
-
-      var needle = {
-        source: source,
-        originalLine: util.getArg(aArgs, 'line'),
-        originalColumn: util.getArg(aArgs, 'column')
-      };
-
-      var index = this._findMapping(
-        needle,
-        this._originalMappings,
-        "originalLine",
-        "originalColumn",
-        util.compareByOriginalPositions,
-        util.getArg(aArgs, 'bias', SourceMapConsumer.GREATEST_LOWER_BOUND)
-      );
-
-      if (index >= 0) {
-        var mapping = this._originalMappings[index];
-
-        if (mapping.source === needle.source) {
-          return {
-            line: util.getArg(mapping, 'generatedLine', null),
-            column: util.getArg(mapping, 'generatedColumn', null),
-            lastColumn: util.getArg(mapping, 'lastGeneratedColumn', null)
-          };
-        }
-      }
-
-      return {
-        line: null,
-        column: null,
-        lastColumn: null
-      };
-    };
-
-  exports.BasicSourceMapConsumer = BasicSourceMapConsumer;
-
-  /**
-   * An IndexedSourceMapConsumer instance represents a parsed source map which
-   * we can query for information. It differs from BasicSourceMapConsumer in
-   * that it takes "indexed" source maps (i.e. ones with a "sections" field) as
-   * input.
-   *
-   * The only parameter is a raw source map (either as a JSON string, or already
-   * parsed to an object). According to the spec for indexed source maps, they
-   * have the following attributes:
-   *
-   *   - version: Which version of the source map spec this map is following.
-   *   - file: Optional. The generated file this source map is associated with.
-   *   - sections: A list of section definitions.
-   *
-   * Each value under the "sections" field has two fields:
-   *   - offset: The offset into the original specified at which this section
-   *       begins to apply, defined as an object with a "line" and "column"
-   *       field.
-   *   - map: A source map definition. This source map could also be indexed,
-   *       but doesn't have to be.
-   *
-   * Instead of the "map" field, it's also possible to have a "url" field
-   * specifying a URL to retrieve a source map from, but that's currently
-   * unsupported.
-   *
-   * Here's an example source map, taken from the source map spec[0], but
-   * modified to omit a section which uses the "url" field.
-   *
-   *  {
-   *    version : 3,
-   *    file: "app.js",
-   *    sections: [{
-   *      offset: {line:100, column:10},
-   *      map: {
-   *        version : 3,
-   *        file: "section.js",
-   *        sources: ["foo.js", "bar.js"],
-   *        names: ["src", "maps", "are", "fun"],
-   *        mappings: "AAAA,E;;ABCDE;"
-   *      }
-   *    }],
-   *  }
-   *
-   * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit#heading=h.535es3xeprgt
-   */
-  function IndexedSourceMapConsumer(aSourceMap) {
-    var sourceMap = aSourceMap;
-    if (typeof aSourceMap === 'string') {
-      sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
-    }
-
-    var version = util.getArg(sourceMap, 'version');
-    var sections = util.getArg(sourceMap, 'sections');
-
-    if (version != this._version) {
-      throw new Error('Unsupported version: ' + version);
-    }
-
-    this._sources = new ArraySet();
-    this._names = new ArraySet();
-
-    var lastOffset = {
-      line: -1,
-      column: 0
-    };
-    this._sections = sections.map(function (s) {
-      if (s.url) {
-        // The url field will require support for asynchronicity.
-        // See https://github.com/mozilla/source-map/issues/16
-        throw new Error('Support for url field in sections not implemented.');
-      }
-      var offset = util.getArg(s, 'offset');
-      var offsetLine = util.getArg(offset, 'line');
-      var offsetColumn = util.getArg(offset, 'column');
-
-      if (offsetLine < lastOffset.line ||
-          (offsetLine === lastOffset.line && offsetColumn < lastOffset.column)) {
-        throw new Error('Section offsets must be ordered and non-overlapping.');
-      }
-      lastOffset = offset;
-
-      return {
-        generatedOffset: {
-          // The offset fields are 0-based, but we use 1-based indices when
-          // encoding/decoding from VLQ.
-          generatedLine: offsetLine + 1,
-          generatedColumn: offsetColumn + 1
-        },
-        consumer: new SourceMapConsumer(util.getArg(s, 'map'))
-      }
-    });
-  }
-
-  IndexedSourceMapConsumer.prototype = Object.create(SourceMapConsumer.prototype);
-  IndexedSourceMapConsumer.prototype.constructor = SourceMapConsumer;
-
-  /**
-   * The version of the source mapping spec that we are consuming.
-   */
-  IndexedSourceMapConsumer.prototype._version = 3;
-
-  /**
-   * The list of original sources.
-   */
-  Object.defineProperty(IndexedSourceMapConsumer.prototype, 'sources', {
-    get: function () {
-      var sources = [];
-      for (var i = 0; i < this._sections.length; i++) {
-        for (var j = 0; j < this._sections[i].consumer.sources.length; j++) {
-          sources.push(this._sections[i].consumer.sources[j]);
-        }
-      };
-      return sources;
-    }
-  });
-
-  /**
-   * Returns the original source, line, and column information for the generated
-   * source's line and column positions provided. The only argument is an object
-   * with the following properties:
-   *
-   *   - line: The line number in the generated source.
-   *   - column: The column number in the generated source.
-   *
-   * and an object is returned with the following properties:
-   *
-   *   - source: The original source file, or null.
-   *   - line: The line number in the original source, or null.
-   *   - column: The column number in the original source, or null.
-   *   - name: The original identifier, or null.
-   */
-  IndexedSourceMapConsumer.prototype.originalPositionFor =
-    function IndexedSourceMapConsumer_originalPositionFor(aArgs) {
-      var needle = {
-        generatedLine: util.getArg(aArgs, 'line'),
-        generatedColumn: util.getArg(aArgs, 'column')
-      };
-
-      // Find the section containing the generated position we're trying to map
-      // to an original position.
-      var sectionIndex = binarySearch.search(needle, this._sections,
-        function(needle, section) {
-          var cmp = needle.generatedLine - section.generatedOffset.generatedLine;
-          if (cmp) {
-            return cmp;
-          }
-
-          return (needle.generatedColumn -
-                  section.generatedOffset.generatedColumn);
-        });
-      var section = this._sections[sectionIndex];
-
-      if (!section) {
-        return {
-          source: null,
-          line: null,
-          column: null,
-          name: null
-        };
-      }
-
-      return section.consumer.originalPositionFor({
-        line: needle.generatedLine -
-          (section.generatedOffset.generatedLine - 1),
-        column: needle.generatedColumn -
-          (section.generatedOffset.generatedLine === needle.generatedLine
-           ? section.generatedOffset.generatedColumn - 1
-           : 0),
-        bias: aArgs.bias
-      });
-    };
-
-  /**
-   * Return true if we have the source content for every source in the source
-   * map, false otherwise.
-   */
-  IndexedSourceMapConsumer.prototype.hasContentsOfAllSources =
-    function IndexedSourceMapConsumer_hasContentsOfAllSources() {
-      return this._sections.every(function (s) {
-        return s.consumer.hasContentsOfAllSources();
-      });
-    };
-
-  /**
-   * Returns the original source content. The only argument is the url of the
-   * original source file. Returns null if no original source content is
-   * available.
-   */
-  IndexedSourceMapConsumer.prototype.sourceContentFor =
-    function IndexedSourceMapConsumer_sourceContentFor(aSource, nullOnMissing) {
-      for (var i = 0; i < this._sections.length; i++) {
-        var section = this._sections[i];
-
-        var content = section.consumer.sourceContentFor(aSource, true);
-        if (content) {
-          return content;
-        }
-      }
-      if (nullOnMissing) {
-        return null;
-      }
-      else {
-        throw new Error('"' + aSource + '" is not in the SourceMap.');
-      }
-    };
-
-  /**
-   * Returns the generated line and column information for the original source,
-   * line, and column positions provided. The only argument is an object with
-   * the following properties:
-   *
-   *   - source: The filename of the original source.
-   *   - line: The line number in the original source.
-   *   - column: The column number in the original source.
-   *
-   * and an object is returned with the following properties:
-   *
-   *   - line: The line number in the generated source, or null.
-   *   - column: The column number in the generated source, or null.
-   */
-  IndexedSourceMapConsumer.prototype.generatedPositionFor =
-    function IndexedSourceMapConsumer_generatedPositionFor(aArgs) {
-      for (var i = 0; i < this._sections.length; i++) {
-        var section = this._sections[i];
-
-        // Only consider this section if the requested source is in the list of
-        // sources of the consumer.
-        if (section.consumer.sources.indexOf(util.getArg(aArgs, 'source')) === -1) {
-          continue;
-        }
-        var generatedPosition = section.consumer.generatedPositionFor(aArgs);
-        if (generatedPosition) {
-          var ret = {
-            line: generatedPosition.line +
-              (section.generatedOffset.generatedLine - 1),
-            column: generatedPosition.column +
-              (section.generatedOffset.generatedLine === generatedPosition.line
-               ? section.generatedOffset.generatedColumn - 1
-               : 0)
-          };
-          return ret;
-        }
-      }
-
-      return {
-        line: null,
-        column: null
-      };
-    };
-
-  /**
-   * Parse the mappings in a string in to a data structure which we can easily
-   * query (the ordered arrays in the `this.__generatedMappings` and
-   * `this.__originalMappings` properties).
-   */
-  IndexedSourceMapConsumer.prototype._parseMappings =
-    function IndexedSourceMapConsumer_parseMappings(aStr, aSourceRoot) {
-      this.__generatedMappings = [];
-      this.__originalMappings = [];
-      for (var i = 0; i < this._sections.length; i++) {
-        var section = this._sections[i];
-        var sectionMappings = section.consumer._generatedMappings;
-        for (var j = 0; j < sectionMappings.length; j++) {
-          var mapping = sectionMappings[i];
-
-          var source = section.consumer._sources.at(mapping.source);
-          if (section.consumer.sourceRoot !== null) {
-            source = util.join(section.consumer.sourceRoot, source);
-          }
-          this._sources.add(source);
-          source = this._sources.indexOf(source);
-
-          var name = section.consumer._names.at(mapping.name);
-          this._names.add(name);
-          name = this._names.indexOf(name);
-
-          // The mappings coming from the consumer for the section have
-          // generated positions relative to the start of the section, so we
-          // need to offset them to be relative to the start of the concatenated
-          // generated file.
-          var adjustedMapping = {
-            source: source,
-            generatedLine: mapping.generatedLine +
-              (section.generatedOffset.generatedLine - 1),
-            generatedColumn: mapping.column +
-              (section.generatedOffset.generatedLine === mapping.generatedLine)
-              ? section.generatedOffset.generatedColumn - 1
-              : 0,
-            originalLine: mapping.originalLine,
-            originalColumn: mapping.originalColumn,
-            name: name
-          };
-
-          this.__generatedMappings.push(adjustedMapping);
-          if (typeof adjustedMapping.originalLine === 'number') {
-            this.__originalMappings.push(adjustedMapping);
-          }
-        };
-      };
-
-      quickSort(this.__generatedMappings, util.compareByGeneratedPositionsDeflated);
-      quickSort(this.__originalMappings, util.compareByOriginalPositions);
-    };
-
-  exports.IndexedSourceMapConsumer = IndexedSourceMapConsumer;
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/util', ['require', 'exports', 'module' , ], function(require, exports, module) {
-
-  /**
-   * This is a helper function for getting values from parameter/options
-   * objects.
-   *
-   * @param args The object we are extracting values from
-   * @param name The name of the property we are getting.
-   * @param defaultValue An optional value to return if the property is missing
-   * from the object. If this is not specified and the property is missing, an
-   * error will be thrown.
-   */
-  function getArg(aArgs, aName, aDefaultValue) {
-    if (aName in aArgs) {
-      return aArgs[aName];
-    } else if (arguments.length === 3) {
-      return aDefaultValue;
-    } else {
-      throw new Error('"' + aName + '" is a required argument.');
-    }
-  }
-  exports.getArg = getArg;
-
-  var urlRegexp = /^(?:([\w+\-.]+):)?\/\/(?:(\w+:\w+)@)?([\w.]*)(?::(\d+))?(\S*)$/;
-  var dataUrlRegexp = /^data:.+\,.+$/;
-
-  function urlParse(aUrl) {
-    var match = aUrl.match(urlRegexp);
-    if (!match) {
-      return null;
-    }
-    return {
-      scheme: match[1],
-      auth: match[2],
-      host: match[3],
-      port: match[4],
-      path: match[5]
-    };
-  }
-  exports.urlParse = urlParse;
-
-  function urlGenerate(aParsedUrl) {
-    var url = '';
-    if (aParsedUrl.scheme) {
-      url += aParsedUrl.scheme + ':';
-    }
-    url += '//';
-    if (aParsedUrl.auth) {
-      url += aParsedUrl.auth + '@';
-    }
-    if (aParsedUrl.host) {
-      url += aParsedUrl.host;
-    }
-    if (aParsedUrl.port) {
-      url += ":" + aParsedUrl.port
-    }
-    if (aParsedUrl.path) {
-      url += aParsedUrl.path;
-    }
-    return url;
-  }
-  exports.urlGenerate = urlGenerate;
-
-  /**
-   * Normalizes a path, or the path portion of a URL:
-   *
-   * - Replaces consequtive slashes with one slash.
-   * - Removes unnecessary '.' parts.
-   * - Removes unnecessary '<dir>/..' parts.
-   *
-   * Based on code in the Node.js 'path' core module.
-   *
-   * @param aPath The path or url to normalize.
-   */
-  function normalize(aPath) {
-    var path = aPath;
-    var url = urlParse(aPath);
-    if (url) {
-      if (!url.path) {
-        return aPath;
-      }
-      path = url.path;
-    }
-    var isAbsolute = (path.charAt(0) === '/');
-
-    var parts = path.split(/\/+/);
-    for (var part, up = 0, i = parts.length - 1; i >= 0; i--) {
-      part = parts[i];
-      if (part === '.') {
-        parts.splice(i, 1);
-      } else if (part === '..') {
-        up++;
-      } else if (up > 0) {
-        if (part === '') {
-          // The first part is blank if the path is absolute. Trying to go
-          // above the root is a no-op. Therefore we can remove all '..' parts
-          // directly after the root.
-          parts.splice(i + 1, up);
-          up = 0;
-        } else {
-          parts.splice(i, 2);
-          up--;
-        }
-      }
-    }
-    path = parts.join('/');
-
-    if (path === '') {
-      path = isAbsolute ? '/' : '.';
-    }
-
-    if (url) {
-      url.path = path;
-      return urlGenerate(url);
-    }
-    return path;
-  }
-  exports.normalize = normalize;
-
-  /**
-   * Joins two paths/URLs.
-   *
-   * @param aRoot The root path or URL.
-   * @param aPath The path or URL to be joined with the root.
-   *
-   * - If aPath is a URL or a data URI, aPath is returned, unless aPath is a
-   *   scheme-relative URL: Then the scheme of aRoot, if any, is prepended
-   *   first.
-   * - Otherwise aPath is a path. If aRoot is a URL, then its path portion
-   *   is updated with the result and aRoot is returned. Otherwise the result
-   *   is returned.
-   *   - If aPath is absolute, the result is aPath.
-   *   - Otherwise the two paths are joined with a slash.
-   * - Joining for example 'http://' and 'www.example.com' is also supported.
-   */
-  function join(aRoot, aPath) {
-    if (aRoot === "") {
-      aRoot = ".";
-    }
-    if (aPath === "") {
-      aPath = ".";
-    }
-    var aPathUrl = urlParse(aPath);
-    var aRootUrl = urlParse(aRoot);
-    if (aRootUrl) {
-      aRoot = aRootUrl.path || '/';
-    }
-
-    // `join(foo, '//www.example.org')`
-    if (aPathUrl && !aPathUrl.scheme) {
-      if (aRootUrl) {
-        aPathUrl.scheme = aRootUrl.scheme;
-      }
-      return urlGenerate(aPathUrl);
-    }
-
-    if (aPathUrl || aPath.match(dataUrlRegexp)) {
-      return aPath;
-    }
-
-    // `join('http://', 'www.example.com')`
-    if (aRootUrl && !aRootUrl.host && !aRootUrl.path) {
-      aRootUrl.host = aPath;
-      return urlGenerate(aRootUrl);
-    }
-
-    var joined = aPath.charAt(0) === '/'
-      ? aPath
-      : normalize(aRoot.replace(/\/+$/, '') + '/' + aPath);
-
-    if (aRootUrl) {
-      aRootUrl.path = joined;
-      return urlGenerate(aRootUrl);
-    }
-    return joined;
-  }
-  exports.join = join;
-
-  /**
-   * Make a path relative to a URL or another path.
-   *
-   * @param aRoot The root path or URL.
-   * @param aPath The path or URL to be made relative to aRoot.
-   */
-  function relative(aRoot, aPath) {
-    if (aRoot === "") {
-      aRoot = ".";
-    }
-
-    aRoot = aRoot.replace(/\/$/, '');
-
-    // It is possible for the path to be above the root. In this case, simply
-    // checking whether the root is a prefix of the path won't work. Instead, we
-    // need to remove components from the root one by one, until either we find
-    // a prefix that fits, or we run out of components to remove.
-    var level = 0;
-    while (aPath.indexOf(aRoot + '/') !== 0) {
-      var index = aRoot.lastIndexOf("/");
-      if (index < 0) {
-        return aPath;
-      }
-
-      // If the only part of the root that is left is the scheme (i.e. http://,
-      // file:///, etc.), one or more slashes (/), or simply nothing at all, we
-      // have exhausted all components, so the path is not relative to the root.
-      aRoot = aRoot.slice(0, index);
-      if (aRoot.match(/^([^\/]+:\/)?\/*$/)) {
-        return aPath;
-      }
-
-      ++level;
-    }
-
-    // Make sure we add a "../" for each component we removed from the root.
-    return Array(level + 1).join("../") + aPath.substr(aRoot.length + 1);
-  }
-  exports.relative = relative;
-
-  /**
-   * Because behavior goes wacky when you set `__proto__` on objects, we
-   * have to prefix all the strings in our set with an arbitrary character.
-   *
-   * See https://github.com/mozilla/source-map/pull/31 and
-   * https://github.com/mozilla/source-map/issues/30
-   *
-   * @param String aStr
-   */
-  function toSetString(aStr) {
-    return '$' + aStr;
-  }
-  exports.toSetString = toSetString;
-
-  function fromSetString(aStr) {
-    return aStr.substr(1);
-  }
-  exports.fromSetString = fromSetString;
-
-  /**
-   * Comparator between two mappings where the original positions are compared.
-   *
-   * Optionally pass in `true` as `onlyCompareGenerated` to consider two
-   * mappings with the same original source/line/column, but different generated
-   * line and column the same. Useful when searching for a mapping with a
-   * stubbed out mapping.
-   */
-  function compareByOriginalPositions(mappingA, mappingB, onlyCompareOriginal) {
-    var cmp = mappingA.source - mappingB.source;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.originalLine - mappingB.originalLine;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.originalColumn - mappingB.originalColumn;
-    if (cmp !== 0 || onlyCompareOriginal) {
-      return cmp;
-    }
-
-    cmp = mappingA.generatedColumn - mappingB.generatedColumn;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.generatedLine - mappingB.generatedLine;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    return mappingA.name - mappingB.name;
-  };
-  exports.compareByOriginalPositions = compareByOriginalPositions;
-
-  /**
-   * Comparator between two mappings with deflated source and name indices where
-   * the generated positions are compared.
-   *
-   * Optionally pass in `true` as `onlyCompareGenerated` to consider two
-   * mappings with the same generated line and column, but different
-   * source/name/original line and column the same. Useful when searching for a
-   * mapping with a stubbed out mapping.
-   */
-  function compareByGeneratedPositionsDeflated(mappingA, mappingB, onlyCompareGenerated) {
-    var cmp = mappingA.generatedLine - mappingB.generatedLine;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.generatedColumn - mappingB.generatedColumn;
-    if (cmp !== 0 || onlyCompareGenerated) {
-      return cmp;
-    }
-
-    cmp = mappingA.source - mappingB.source;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.originalLine - mappingB.originalLine;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.originalColumn - mappingB.originalColumn;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    return mappingA.name - mappingB.name;
-  };
-  exports.compareByGeneratedPositionsDeflated = compareByGeneratedPositionsDeflated;
-
-  function strcmp(aStr1, aStr2) {
-    if (aStr1 === aStr2) {
-      return 0;
-    }
-
-    if (aStr1 > aStr2) {
-      return 1;
-    }
-
-    return -1;
-  }
-
-  /**
-   * Comparator between two mappings with inflated source and name strings where
-   * the generated positions are compared.
-   */
-  function compareByGeneratedPositionsInflated(mappingA, mappingB) {
-    var cmp = mappingA.generatedLine - mappingB.generatedLine;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.generatedColumn - mappingB.generatedColumn;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = strcmp(mappingA.source, mappingB.source);
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.originalLine - mappingB.originalLine;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    cmp = mappingA.originalColumn - mappingB.originalColumn;
-    if (cmp !== 0) {
-      return cmp;
-    }
-
-    return strcmp(mappingA.name, mappingB.name);
-  };
-  exports.compareByGeneratedPositionsInflated = compareByGeneratedPositionsInflated;
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/binary-search', ['require', 'exports', 'module' , ], function(require, exports, module) {
-
-  exports.GREATEST_LOWER_BOUND = 1;
-  exports.LEAST_UPPER_BOUND = 2;
-
-  /**
-   * Recursive implementation of binary search.
-   *
-   * @param aLow Indices here and lower do not contain the needle.
-   * @param aHigh Indices here and higher do not contain the needle.
-   * @param aNeedle The element being searched for.
-   * @param aHaystack The non-empty array being searched.
-   * @param aCompare Function which takes two elements and returns -1, 0, or 1.
-   * @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
-   *     'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
-   *     closest element that is smaller than or greater than the one we are
-   *     searching for, respectively, if the exact element cannot be found.
-   */
-  function recursiveSearch(aLow, aHigh, aNeedle, aHaystack, aCompare, aBias) {
-    // This function terminates when one of the following is true:
-    //
-    //   1. We find the exact element we are looking for.
-    //
-    //   2. We did not find the exact element, but we can return the index of
-    //      the next-closest element.
-    //
-    //   3. We did not find the exact element, and there is no next-closest
-    //      element than the one we are searching for, so we return -1.
-    var mid = Math.floor((aHigh - aLow) / 2) + aLow;
-    var cmp = aCompare(aNeedle, aHaystack[mid], true);
-    if (cmp === 0) {
-      // Found the element we are looking for.
-      return mid;
-    }
-    else if (cmp > 0) {
-      // Our needle is greater than aHaystack[mid].
-      if (aHigh - mid > 1) {
-        // The element is in the upper half.
-        return recursiveSearch(mid, aHigh, aNeedle, aHaystack, aCompare, aBias);
-      }
-
-      // The exact needle element was not found in this haystack. Determine if
-      // we are in termination case (3) or (2) and return the appropriate thing.
-      if (aBias == exports.LEAST_UPPER_BOUND) {
-        return aHigh < aHaystack.length ? aHigh : -1;
-      } else {
-        return mid;
-      }
-    }
-    else {
-      // Our needle is less than aHaystack[mid].
-      if (mid - aLow > 1) {
-        // The element is in the lower half.
-        return recursiveSearch(aLow, mid, aNeedle, aHaystack, aCompare, aBias);
-      }
-
-      // we are in termination case (3) or (2) and return the appropriate thing.
-      if (aBias == exports.LEAST_UPPER_BOUND) {
-        return mid;
-      } else {
-        return aLow < 0 ? -1 : aLow;
-      }
-    }
-  }
-
-  /**
-   * This is an implementation of binary search which will always try and return
-   * the index of the closest element if there is no exact hit. This is because
-   * mappings between original and generated line/col pairs are single points,
-   * and there is an implicit region between each of them, so a miss just means
-   * that you aren't on the very start of a region.
-   *
-   * @param aNeedle The element you are looking for.
-   * @param aHaystack The array that is being searched.
-   * @param aCompare A function which takes the needle and an element in the
-   *     array and returns -1, 0, or 1 depending on whether the needle is less
-   *     than, equal to, or greater than the element, respectively.
-   * @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
-   *     'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
-   *     closest element that is smaller than or greater than the one we are
-   *     searching for, respectively, if the exact element cannot be found.
-   *     Defaults to 'binarySearch.GREATEST_LOWER_BOUND'.
-   */
-  exports.search = function search(aNeedle, aHaystack, aCompare, aBias) {
-    if (aHaystack.length === 0) {
-      return -1;
-    }
-
-    var index = recursiveSearch(-1, aHaystack.length, aNeedle, aHaystack,
-                                aCompare, aBias || exports.GREATEST_LOWER_BOUND);
-    if (index < 0) {
-      return -1;
-    }
-
-    // We have found either the exact element, or the next-closest element than
-    // the one we are searching for. However, there may be more than one such
-    // element. Make sure we always return the smallest of these.
-    while (index - 1 >= 0) {
-      if (aCompare(aHaystack[index], aHaystack[index - 1], true) !== 0) {
-        break;
-      }
-      --index;
-    }
-
-    return index;
-  };
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/array-set', ['require', 'exports', 'module' ,  'source-map/util'], function(require, exports, module) {
-
-  var util = require('source-map/util');
-
-  /**
-   * A data structure which is a combination of an array and a set. Adding a new
-   * member is O(1), testing for membership is O(1), and finding the index of an
-   * element is O(1). Removing elements from the set is not supported. Only
-   * strings are supported for membership.
-   */
-  function ArraySet() {
-    this._array = [];
-    this._set = {};
-  }
-
-  /**
-   * Static method for creating ArraySet instances from an existing array.
-   */
-  ArraySet.fromArray = function ArraySet_fromArray(aArray, aAllowDuplicates) {
-    var set = new ArraySet();
-    for (var i = 0, len = aArray.length; i < len; i++) {
-      set.add(aArray[i], aAllowDuplicates);
-    }
-    return set;
-  };
-
-  /**
-   * Return how many unique items are in this ArraySet. If duplicates have been
-   * added, than those do not count towards the size.
-   *
-   * @returns Number
-   */
-  ArraySet.prototype.size = function ArraySet_size() {
-    return Object.getOwnPropertyNames(this._set).length;
-  };
-
-  /**
-   * Add the given string to this set.
-   *
-   * @param String aStr
-   */
-  ArraySet.prototype.add = function ArraySet_add(aStr, aAllowDuplicates) {
-    var isDuplicate = this.has(aStr);
-    var idx = this._array.length;
-    if (!isDuplicate || aAllowDuplicates) {
-      this._array.push(aStr);
-    }
-    if (!isDuplicate) {
-      this._set[util.toSetString(aStr)] = idx;
-    }
-  };
-
-  /**
-   * Is the given string a member of this set?
-   *
-   * @param String aStr
-   */
-  ArraySet.prototype.has = function ArraySet_has(aStr) {
-    return Object.prototype.hasOwnProperty.call(this._set,
-                                                util.toSetString(aStr));
-  };
-
-  /**
-   * What is the index of the given string in the array?
-   *
-   * @param String aStr
-   */
-  ArraySet.prototype.indexOf = function ArraySet_indexOf(aStr) {
-    if (this.has(aStr)) {
-      return this._set[util.toSetString(aStr)];
-    }
-    throw new Error('"' + aStr + '" is not in the set.');
-  };
-
-  /**
-   * What is the element at the given index?
-   *
-   * @param Number aIdx
-   */
-  ArraySet.prototype.at = function ArraySet_at(aIdx) {
-    if (aIdx >= 0 && aIdx < this._array.length) {
-      return this._array[aIdx];
-    }
-    throw new Error('No element indexed by ' + aIdx);
-  };
-
-  /**
-   * Returns the array representation of this set (which has the proper indices
-   * indicated by indexOf). Note that this is a copy of the internal array used
-   * for storing the members so that no one can mess with internal state.
-   */
-  ArraySet.prototype.toArray = function ArraySet_toArray() {
-    return this._array.slice();
-  };
-
-  exports.ArraySet = ArraySet;
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- *
- * Based on the Base 64 VLQ implementation in Closure Compiler:
- * https://code.google.com/p/closure-compiler/source/browse/trunk/src/com/google/debugging/sourcemap/Base64VLQ.java
- *
- * Copyright 2011 The Closure Compiler Authors. All rights reserved.
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above
- *    copyright notice, this list of conditions and the following
- *    disclaimer in the documentation and/or other materials provided
- *    with the distribution.
- *  * Neither the name of Google Inc. nor the names of its
- *    contributors may be used to endorse or promote products derived
- *    from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-define('source-map/base64-vlq', ['require', 'exports', 'module' ,  'source-map/base64'], function(require, exports, module) {
-
-  var base64 = require('source-map/base64');
-
-  // A single base 64 digit can contain 6 bits of data. For the base 64 variable
-  // length quantities we use in the source map spec, the first bit is the sign,
-  // the next four bits are the actual value, and the 6th bit is the
-  // continuation bit. The continuation bit tells us whether there are more
-  // digits in this value following this digit.
-  //
-  //   Continuation
-  //   |    Sign
-  //   |    |
-  //   V    V
-  //   101011
-
-  var VLQ_BASE_SHIFT = 5;
-
-  // binary: 100000
-  var VLQ_BASE = 1 << VLQ_BASE_SHIFT;
-
-  // binary: 011111
-  var VLQ_BASE_MASK = VLQ_BASE - 1;
-
-  // binary: 100000
-  var VLQ_CONTINUATION_BIT = VLQ_BASE;
-
-  /**
-   * Converts from a two-complement value to a value where the sign bit is
-   * placed in the least significant bit.  For example, as decimals:
-   *   1 becomes 2 (10 binary), -1 becomes 3 (11 binary)
-   *   2 becomes 4 (100 binary), -2 becomes 5 (101 binary)
-   */
-  function toVLQSigned(aValue) {
-    return aValue < 0
-      ? ((-aValue) << 1) + 1
-      : (aValue << 1) + 0;
-  }
-
-  /**
-   * Converts to a two-complement value from a value where the sign bit is
-   * placed in the least significant bit.  For example, as decimals:
-   *   2 (10 binary) becomes 1, 3 (11 binary) becomes -1
-   *   4 (100 binary) becomes 2, 5 (101 binary) becomes -2
-   */
-  function fromVLQSigned(aValue) {
-    var isNegative = (aValue & 1) === 1;
-    var shifted = aValue >> 1;
-    return isNegative
-      ? -shifted
-      : shifted;
-  }
-
-  /**
-   * Returns the base 64 VLQ encoded value.
-   */
-  exports.encode = function base64VLQ_encode(aValue) {
-    var encoded = "";
-    var digit;
-
-    var vlq = toVLQSigned(aValue);
-
-    do {
-      digit = vlq & VLQ_BASE_MASK;
-      vlq >>>= VLQ_BASE_SHIFT;
-      if (vlq > 0) {
-        // There are still more digits in this value, so we must make sure the
-        // continuation bit is marked.
-        digit |= VLQ_CONTINUATION_BIT;
-      }
-      encoded += base64.encode(digit);
-    } while (vlq > 0);
-
-    return encoded;
-  };
-
-  /**
-   * Decodes the next base 64 VLQ value from the given string and returns the
-   * value and the rest of the string via the out parameter.
-   */
-  exports.decode = function base64VLQ_decode(aStr, aIndex, aOutParam) {
-    var strLen = aStr.length;
-    var result = 0;
-    var shift = 0;
-    var continuation, digit;
-
-    do {
-      if (aIndex >= strLen) {
-        throw new Error("Expected more digits in base 64 VLQ value.");
-      }
-
-      digit = base64.decode(aStr.charCodeAt(aIndex++));
-      if (digit === -1) {
-        throw new Error("Invalid base64 digit: " + aStr.charAt(aIndex - 1));
-      }
-
-      continuation = !!(digit & VLQ_CONTINUATION_BIT);
-      digit &= VLQ_BASE_MASK;
-      result = result + (digit << shift);
-      shift += VLQ_BASE_SHIFT;
-    } while (continuation);
-
-    aOutParam.value = fromVLQSigned(result);
-    aOutParam.rest = aIndex;
-  };
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/base64', ['require', 'exports', 'module' , ], function(require, exports, module) {
-
-  var intToCharMap = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split('');
-
-  /**
-   * Encode an integer in the range of 0 to 63 to a single base 64 digit.
-   */
-  exports.encode = function (number) {
-    if (0 <= number && number < intToCharMap.length) {
-      return intToCharMap[number];
-    }
-    throw new TypeError("Must be between 0 and 63: " + aNumber);
-  };
-
-  /**
-   * Decode a single base 64 character code digit to an integer. Returns -1 on
-   * failure.
-   */
-  exports.decode = function (charCode) {
-    var bigA = 65;     // 'A'
-    var bigZ = 90;     // 'Z'
-
-    var littleA = 97;  // 'a'
-    var littleZ = 122; // 'z'
-
-    var zero = 48;     // '0'
-    var nine = 57;     // '9'
-
-    var plus = 43;     // '+'
-    var slash = 47;    // '/'
-
-    var littleOffset = 26;
-    var numberOffset = 52;
-
-    // 0 - 25: ABCDEFGHIJKLMNOPQRSTUVWXYZ
-    if (bigA <= charCode && charCode <= bigZ) {
-      return (charCode - bigA);
-    }
-
-    // 26 - 51: abcdefghijklmnopqrstuvwxyz
-    if (littleA <= charCode && charCode <= littleZ) {
-      return (charCode - littleA + littleOffset);
-    }
-
-    // 52 - 61: 0123456789
-    if (zero <= charCode && charCode <= nine) {
-      return (charCode - zero + numberOffset);
-    }
-
-    // 62: +
-    if (charCode == plus) {
-      return 62;
-    }
-
-    // 63: /
-    if (charCode == slash) {
-      return 63;
-    }
-
-    // Invalid base64 digit.
-    return -1;
-  };
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/quick-sort', ['require', 'exports', 'module' , ], function(require, exports, module) {
-
-  // It turns out that some (most?) JavaScript engines don't self-host
-  // `Array.prototype.sort`. This makes sense because C++ will likely remain
-  // faster than JS when doing raw CPU-intensive sorting. However, when using a
-  // custom comparator function, calling back and forth between the VM's C++ and
-  // JIT'd JS is rather slow *and* loses JIT type information, resulting in
-  // worse generated code for the comparator function than would be optimal. In
-  // fact, when sorting with a comparator, these costs outweigh the benefits of
-  // sorting in C++. By using our own JS-implemented Quick Sort (below), we get
-  // a ~3500ms mean speed-up in `bench/bench.html`.
-
-  /**
-   * Swap the elements indexed by `x` and `y` in the array `ary`.
-   *
-   * @param {Array} ary
-   *        The array.
-   * @param {Number} x
-   *        The index of the first item.
-   * @param {Number} y
-   *        The index of the second item.
-   */
-  function swap(ary, x, y) {
-    var temp = ary[x];
-    ary[x] = ary[y];
-    ary[y] = temp;
-  }
-
-  /**
-   * Returns a random integer within the range `low .. high` inclusive.
-   *
-   * @param {Number} low
-   *        The lower bound on the range.
-   * @param {Number} high
-   *        The upper bound on the range.
-   */
-  function randomIntInRange(low, high) {
-    return Math.round(low + (Math.random() * (high - low)));
-  }
-
-  /**
-   * The Quick Sort algorithm.
-   *
-   * @param {Array} ary
-   *        An array to sort.
-   * @param {function} comparator
-   *        Function to use to compare two items.
-   * @param {Number} p
-   *        Start index of the array
-   * @param {Number} r
-   *        End index of the array
-   */
-  function doQuickSort(ary, comparator, p, r) {
-    // If our lower bound is less than our upper bound, we (1) partition the
-    // array into two pieces and (2) recurse on each half. If it is not, this is
-    // the empty array and our base case.
-
-    if (p < r) {
-      // (1) Partitioning.
-      //
-      // The partitioning chooses a pivot between `p` and `r` and moves all
-      // elements that are less than or equal to the pivot to the before it, and
-      // all the elements that are greater than it after it. The effect is that
-      // once partition is done, the pivot is in the exact place it will be when
-      // the array is put in sorted order, and it will not need to be moved
-      // again. This runs in O(n) time.
-
-      // Always choose a random pivot so that an input array which is reverse
-      // sorted does not cause O(n^2) running time.
-      var pivotIndex = randomIntInRange(p, r);
-      var i = p - 1;
-
-      swap(ary, pivotIndex, r);
-      var pivot = ary[r];
-
-      // Immediately after `j` is incremented in this loop, the following hold
-      // true:
-      //
-      //   * Every element in `ary[p .. i]` is less than or equal to the pivot.
-      //
-      //   * Every element in `ary[i+1 .. j-1]` is greater than the pivot.
-      for (var j = p; j < r; j++) {
-        if (comparator(ary[j], pivot) <= 0) {
-          i += 1;
-          swap(ary, i, j);
-        }
-      }
-
-      swap(ary, i + 1, j);
-      var q = i + 1;
-
-      // (2) Recurse on each half.
-
-      doQuickSort(ary, comparator, p, q - 1);
-      doQuickSort(ary, comparator, q + 1, r);
-    }
-  }
-
-  /**
-   * Sort the given array in-place with the given comparator function.
-   *
-   * @param {Array} ary
-   *        An array to sort.
-   * @param {function} comparator
-   *        Function to use to compare two items.
-   */
-  exports.quickSort = function (ary, comparator) {
-    doQuickSort(ary, comparator, 0, ary.length - 1);
-  };
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/source-map-generator', ['require', 'exports', 'module' ,  'source-map/base64-vlq', 'source-map/util', 'source-map/array-set', 'source-map/mapping-list'], function(require, exports, module) {
-
-  var base64VLQ = require('source-map/base64-vlq');
-  var util = require('source-map/util');
-  var ArraySet = require('source-map/array-set').ArraySet;
-  var MappingList = require('source-map/mapping-list').MappingList;
-
-  /**
-   * An instance of the SourceMapGenerator represents a source map which is
-   * being built incrementally. You may pass an object with the following
-   * properties:
-   *
-   *   - file: The filename of the generated source.
-   *   - sourceRoot: A root for all relative URLs in this source map.
-   */
-  function SourceMapGenerator(aArgs) {
-    if (!aArgs) {
-      aArgs = {};
-    }
-    this._file = util.getArg(aArgs, 'file', null);
-    this._sourceRoot = util.getArg(aArgs, 'sourceRoot', null);
-    this._skipValidation = util.getArg(aArgs, 'skipValidation', false);
-    this._sources = new ArraySet();
-    this._names = new ArraySet();
-    this._mappings = new MappingList();
-    this._sourcesContents = null;
-  }
-
-  SourceMapGenerator.prototype._version = 3;
-
-  /**
-   * Creates a new SourceMapGenerator based on a SourceMapConsumer
-   *
-   * @param aSourceMapConsumer The SourceMap.
-   */
-  SourceMapGenerator.fromSourceMap =
-    function SourceMapGenerator_fromSourceMap(aSourceMapConsumer) {
-      var sourceRoot = aSourceMapConsumer.sourceRoot;
-      var generator = new SourceMapGenerator({
-        file: aSourceMapConsumer.file,
-        sourceRoot: sourceRoot
-      });
-      aSourceMapConsumer.eachMapping(function (mapping) {
-        var newMapping = {
-          generated: {
-            line: mapping.generatedLine,
-            column: mapping.generatedColumn
-          }
-        };
-
-        if (mapping.source != null) {
-          newMapping.source = mapping.source;
-          if (sourceRoot != null) {
-            newMapping.source = util.relative(sourceRoot, newMapping.source);
-          }
-
-          newMapping.original = {
-            line: mapping.originalLine,
-            column: mapping.originalColumn
-          };
-
-          if (mapping.name != null) {
-            newMapping.name = mapping.name;
-          }
-        }
-
-        generator.addMapping(newMapping);
-      });
-      aSourceMapConsumer.sources.forEach(function (sourceFile) {
-        var content = aSourceMapConsumer.sourceContentFor(sourceFile);
-        if (content != null) {
-          generator.setSourceContent(sourceFile, content);
-        }
-      });
-      return generator;
-    };
-
-  /**
-   * Add a single mapping from original source line and column to the generated
-   * source's line and column for this source map being created. The mapping
-   * object should have the following properties:
-   *
-   *   - generated: An object with the generated line and column positions.
-   *   - original: An object with the original line and column positions.
-   *   - source: The original source file (relative to the sourceRoot).
-   *   - name: An optional original token name for this mapping.
-   */
-  SourceMapGenerator.prototype.addMapping =
-    function SourceMapGenerator_addMapping(aArgs) {
-      var generated = util.getArg(aArgs, 'generated');
-      var original = util.getArg(aArgs, 'original', null);
-      var source = util.getArg(aArgs, 'source', null);
-      var name = util.getArg(aArgs, 'name', null);
-
-      if (!this._skipValidation) {
-        this._validateMapping(generated, original, source, name);
-      }
-
-      if (source != null && !this._sources.has(source)) {
-        this._sources.add(source);
-      }
-
-      if (name != null && !this._names.has(name)) {
-        this._names.add(name);
-      }
-
-      this._mappings.add({
-        generatedLine: generated.line,
-        generatedColumn: generated.column,
-        originalLine: original != null && original.line,
-        originalColumn: original != null && original.column,
-        source: source,
-        name: name
-      });
-    };
-
-  /**
-   * Set the source content for a source file.
-   */
-  SourceMapGenerator.prototype.setSourceContent =
-    function SourceMapGenerator_setSourceContent(aSourceFile, aSourceContent) {
-      var source = aSourceFile;
-      if (this._sourceRoot != null) {
-        source = util.relative(this._sourceRoot, source);
-      }
-
-      if (aSourceContent != null) {
-        // Add the source content to the _sourcesContents map.
-        // Create a new _sourcesContents map if the property is null.
-        if (!this._sourcesContents) {
-          this._sourcesContents = {};
-        }
-        this._sourcesContents[util.toSetString(source)] = aSourceContent;
-      } else if (this._sourcesContents) {
-        // Remove the source file from the _sourcesContents map.
-        // If the _sourcesContents map is empty, set the property to null.
-        delete this._sourcesContents[util.toSetString(source)];
-        if (Object.keys(this._sourcesContents).length === 0) {
-          this._sourcesContents = null;
-        }
-      }
-    };
-
-  /**
-   * Applies the mappings of a sub-source-map for a specific source file to the
-   * source map being generated. Each mapping to the supplied source file is
-   * rewritten using the supplied source map. Note: The resolution for the
-   * resulting mappings is the minimium of this map and the supplied map.
-   *
-   * @param aSourceMapConsumer The source map to be applied.
-   * @param aSourceFile Optional. The filename of the source file.
-   *        If omitted, SourceMapConsumer's file property will be used.
-   * @param aSourceMapPath Optional. The dirname of the path to the source map
-   *        to be applied. If relative, it is relative to the SourceMapConsumer.
-   *        This parameter is needed when the two source maps aren't in the same
-   *        directory, and the source map to be applied contains relative source
-   *        paths. If so, those relative source paths need to be rewritten
-   *        relative to the SourceMapGenerator.
-   */
-  SourceMapGenerator.prototype.applySourceMap =
-    function SourceMapGenerator_applySourceMap(aSourceMapConsumer, aSourceFile, aSourceMapPath) {
-      var sourceFile = aSourceFile;
-      // If aSourceFile is omitted, we will use the file property of the SourceMap
-      if (aSourceFile == null) {
-        if (aSourceMapConsumer.file == null) {
-          throw new Error(
-            'SourceMapGenerator.prototype.applySourceMap requires either an explicit source file, ' +
-            'or the source map\'s "file" property. Both were omitted.'
-          );
-        }
-        sourceFile = aSourceMapConsumer.file;
-      }
-      var sourceRoot = this._sourceRoot;
-      // Make "sourceFile" relative if an absolute Url is passed.
-      if (sourceRoot != null) {
-        sourceFile = util.relative(sourceRoot, sourceFile);
-      }
-      // Applying the SourceMap can add and remove items from the sources and
-      // the names array.
-      var newSources = new ArraySet();
-      var newNames = new ArraySet();
-
-      // Find mappings for the "sourceFile"
-      this._mappings.unsortedForEach(function (mapping) {
-        if (mapping.source === sourceFile && mapping.originalLine != null) {
-          // Check if it can be mapped by the source map, then update the mapping.
-          var original = aSourceMapConsumer.originalPositionFor({
-            line: mapping.originalLine,
-            column: mapping.originalColumn
-          });
-          if (original.source != null) {
-            // Copy mapping
-            mapping.source = original.source;
-            if (aSourceMapPath != null) {
-              mapping.source = util.join(aSourceMapPath, mapping.source)
-            }
-            if (sourceRoot != null) {
-              mapping.source = util.relative(sourceRoot, mapping.source);
-            }
-            mapping.originalLine = original.line;
-            mapping.originalColumn = original.column;
-            if (original.name != null) {
-              mapping.name = original.name;
-            }
-          }
-        }
-
-        var source = mapping.source;
-        if (source != null && !newSources.has(source)) {
-          newSources.add(source);
-        }
-
-        var name = mapping.name;
-        if (name != null && !newNames.has(name)) {
-          newNames.add(name);
-        }
-
-      }, this);
-      this._sources = newSources;
-      this._names = newNames;
-
-      // Copy sourcesContents of applied map.
-      aSourceMapConsumer.sources.forEach(function (sourceFile) {
-        var content = aSourceMapConsumer.sourceContentFor(sourceFile);
-        if (content != null) {
-          if (aSourceMapPath != null) {
-            sourceFile = util.join(aSourceMapPath, sourceFile);
-          }
-          if (sourceRoot != null) {
-            sourceFile = util.relative(sourceRoot, sourceFile);
-          }
-          this.setSourceContent(sourceFile, content);
-        }
-      }, this);
-    };
-
-  /**
-   * A mapping can have one of the three levels of data:
-   *
-   *   1. Just the generated position.
-   *   2. The Generated position, original position, and original source.
-   *   3. Generated and original position, original source, as well as a name
-   *      token.
-   *
-   * To maintain consistency, we validate that any new mapping being added falls
-   * in to one of these categories.
-   */
-  SourceMapGenerator.prototype._validateMapping =
-    function SourceMapGenerator_validateMapping(aGenerated, aOriginal, aSource,
-                                                aName) {
-      if (aGenerated && 'line' in aGenerated && 'column' in aGenerated
-          && aGenerated.line > 0 && aGenerated.column >= 0
-          && !aOriginal && !aSource && !aName) {
-        // Case 1.
-        return;
-      }
-      else if (aGenerated && 'line' in aGenerated && 'column' in aGenerated
-               && aOriginal && 'line' in aOriginal && 'column' in aOriginal
-               && aGenerated.line > 0 && aGenerated.column >= 0
-               && aOriginal.line > 0 && aOriginal.column >= 0
-               && aSource) {
-        // Cases 2 and 3.
-        return;
-      }
-      else {
-        throw new Error('Invalid mapping: ' + JSON.stringify({
-          generated: aGenerated,
-          source: aSource,
-          original: aOriginal,
-          name: aName
-        }));
-      }
-    };
-
-  /**
-   * Serialize the accumulated mappings in to the stream of base 64 VLQs
-   * specified by the source map format.
-   */
-  SourceMapGenerator.prototype._serializeMappings =
-    function SourceMapGenerator_serializeMappings() {
-      var previousGeneratedColumn = 0;
-      var previousGeneratedLine = 1;
-      var previousOriginalColumn = 0;
-      var previousOriginalLine = 0;
-      var previousName = 0;
-      var previousSource = 0;
-      var result = '';
-      var mapping;
-
-      var mappings = this._mappings.toArray();
-      for (var i = 0, len = mappings.length; i < len; i++) {
-        mapping = mappings[i];
-
-        if (mapping.generatedLine !== previousGeneratedLine) {
-          previousGeneratedColumn = 0;
-          while (mapping.generatedLine !== previousGeneratedLine) {
-            result += ';';
-            previousGeneratedLine++;
-          }
-        }
-        else {
-          if (i > 0) {
-            if (!util.compareByGeneratedPositionsInflated(mapping, mappings[i - 1])) {
-              continue;
-            }
-            result += ',';
-          }
-        }
-
-        result += base64VLQ.encode(mapping.generatedColumn
-                                   - previousGeneratedColumn);
-        previousGeneratedColumn = mapping.generatedColumn;
-
-        if (mapping.source != null) {
-          result += base64VLQ.encode(this._sources.indexOf(mapping.source)
-                                     - previousSource);
-          previousSource = this._sources.indexOf(mapping.source);
-
-          // lines are stored 0-based in SourceMap spec version 3
-          result += base64VLQ.encode(mapping.originalLine - 1
-                                     - previousOriginalLine);
-          previousOriginalLine = mapping.originalLine - 1;
-
-          result += base64VLQ.encode(mapping.originalColumn
-                                     - previousOriginalColumn);
-          previousOriginalColumn = mapping.originalColumn;
-
-          if (mapping.name != null) {
-            result += base64VLQ.encode(this._names.indexOf(mapping.name)
-                                       - previousName);
-            previousName = this._names.indexOf(mapping.name);
-          }
-        }
-      }
-
-      return result;
-    };
-
-  SourceMapGenerator.prototype._generateSourcesContent =
-    function SourceMapGenerator_generateSourcesContent(aSources, aSourceRoot) {
-      return aSources.map(function (source) {
-        if (!this._sourcesContents) {
-          return null;
-        }
-        if (aSourceRoot != null) {
-          source = util.relative(aSourceRoot, source);
-        }
-        var key = util.toSetString(source);
-        return Object.prototype.hasOwnProperty.call(this._sourcesContents,
-                                                    key)
-          ? this._sourcesContents[key]
-          : null;
-      }, this);
-    };
-
-  /**
-   * Externalize the source map.
-   */
-  SourceMapGenerator.prototype.toJSON =
-    function SourceMapGenerator_toJSON() {
-      var map = {
-        version: this._version,
-        sources: this._sources.toArray(),
-        names: this._names.toArray(),
-        mappings: this._serializeMappings()
-      };
-      if (this._file != null) {
-        map.file = this._file;
-      }
-      if (this._sourceRoot != null) {
-        map.sourceRoot = this._sourceRoot;
-      }
-      if (this._sourcesContents) {
-        map.sourcesContent = this._generateSourcesContent(map.sources, map.sourceRoot);
-      }
-
-      return map;
-    };
-
-  /**
-   * Render the source map being generated to a string.
-   */
-  SourceMapGenerator.prototype.toString =
-    function SourceMapGenerator_toString() {
-      return JSON.stringify(this.toJSON());
-    };
-
-  exports.SourceMapGenerator = SourceMapGenerator;
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2014 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/mapping-list', ['require', 'exports', 'module' ,  'source-map/util'], function(require, exports, module) {
-
-  var util = require('source-map/util');
-
-  /**
-   * Determine whether mappingB is after mappingA with respect to generated
-   * position.
-   */
-  function generatedPositionAfter(mappingA, mappingB) {
-    // Optimized for most common case
-    var lineA = mappingA.generatedLine;
-    var lineB = mappingB.generatedLine;
-    var columnA = mappingA.generatedColumn;
-    var columnB = mappingB.generatedColumn;
-    return lineB > lineA || lineB == lineA && columnB >= columnA ||
-           util.compareByGeneratedPositionsInflated(mappingA, mappingB) <= 0;
-  }
-
-  /**
-   * A data structure to provide a sorted view of accumulated mappings in a
-   * performance conscious manner. It trades a neglibable overhead in general
-   * case for a large speedup in case of mappings being added in order.
-   */
-  function MappingList() {
-    this._array = [];
-    this._sorted = true;
-    // Serves as infimum
-    this._last = {generatedLine: -1, generatedColumn: 0};
-  }
-
-  /**
-   * Iterate through internal items. This method takes the same arguments that
-   * `Array.prototype.forEach` takes.
-   *
-   * NOTE: The order of the mappings is NOT guaranteed.
-   */
-  MappingList.prototype.unsortedForEach =
-    function MappingList_forEach(aCallback, aThisArg) {
-      this._array.forEach(aCallback, aThisArg);
-    };
-
-  /**
-   * Add the given source mapping.
-   *
-   * @param Object aMapping
-   */
-  MappingList.prototype.add = function MappingList_add(aMapping) {
-    var mapping;
-    if (generatedPositionAfter(this._last, aMapping)) {
-      this._last = aMapping;
-      this._array.push(aMapping);
-    } else {
-      this._sorted = false;
-      this._array.push(aMapping);
-    }
-  };
-
-  /**
-   * Returns the flat, sorted array of mappings. The mappings are sorted by
-   * generated position.
-   *
-   * WARNING: This method returns internal data without copying, for
-   * performance. The return value must NOT be mutated, and should be treated as
-   * an immutable borrow. If you want to take ownership, you must make your own
-   * copy.
-   */
-  MappingList.prototype.toArray = function MappingList_toArray() {
-    if (!this._sorted) {
-      this._array.sort(util.compareByGeneratedPositionsInflated);
-      this._sorted = true;
-    }
-    return this._array;
-  };
-
-  exports.MappingList = MappingList;
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-/*
- * Copyright 2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-define('source-map/source-node', ['require', 'exports', 'module' ,  'source-map/source-map-generator', 'source-map/util'], function(require, exports, module) {
-
-  var SourceMapGenerator = require('source-map/source-map-generator').SourceMapGenerator;
-  var util = require('source-map/util');
-
-  // Matches a Windows-style `\r\n` newline or a `\n` newline used by all other
-  // operating systems these days (capturing the result).
-  var REGEX_NEWLINE = /(\r?\n)/;
-
-  // Newline character code for charCodeAt() comparisons
-  var NEWLINE_CODE = 10;
-
-  // Private symbol for identifying `SourceNode`s when multiple versions of
-  // the source-map library are loaded. This MUST NOT CHANGE across
-  // versions!
-  var isSourceNode = "$$$isSourceNode$$$";
-
-  /**
-   * SourceNodes provide a way to abstract over interpolating/concatenating
-   * snippets of generated JavaScript source code while maintaining the line and
-   * column information associated with the original source code.
-   *
-   * @param aLine The original line number.
-   * @param aColumn The original column number.
-   * @param aSource The original source's filename.
-   * @param aChunks Optional. An array of strings which are snippets of
-   *        generated JS, or other SourceNodes.
-   * @param aName The original identifier.
-   */
-  function SourceNode(aLine, aColumn, aSource, aChunks, aName) {
-    this.children = [];
-    this.sourceContents = {};
-    this.line = aLine == null ? null : aLine;
-    this.column = aColumn == null ? null : aColumn;
-    this.source = aSource == null ? null : aSource;
-    this.name = aName == null ? null : aName;
-    this[isSourceNode] = true;
-    if (aChunks != null) this.add(aChunks);
-  }
-
-  /**
-   * Creates a SourceNode from generated code and a SourceMapConsumer.
-   *
-   * @param aGeneratedCode The generated code
-   * @param aSourceMapConsumer The SourceMap for the generated code
-   * @param aRelativePath Optional. The path that relative sources in the
-   *        SourceMapConsumer should be relative to.
-   */
-  SourceNode.fromStringWithSourceMap =
-    function SourceNode_fromStringWithSourceMap(aGeneratedCode, aSourceMapConsumer, aRelativePath) {
-      // The SourceNode we want to fill with the generated code
-      // and the SourceMap
-      var node = new SourceNode();
-
-      // All even indices of this array are one line of the generated code,
-      // while all odd indices are the newlines between two adjacent lines
-      // (since `REGEX_NEWLINE` captures its match).
-      // Processed fragments are removed from this array, by calling `shiftNextLine`.
-      var remainingLines = aGeneratedCode.split(REGEX_NEWLINE);
-      var shiftNextLine = function() {
-        var lineContents = remainingLines.shift();
-        // The last line of a file might not have a newline.
-        var newLine = remainingLines.shift() || "";
-        return lineContents + newLine;
-      };
-
-      // We need to remember the position of "remainingLines"
-      var lastGeneratedLine = 1, lastGeneratedColumn = 0;
-
-      // The generate SourceNodes we need a code range.
-      // To extract it current and last mapping is used.
-      // Here we store the last mapping.
-      var lastMapping = null;
-
-      aSourceMapConsumer.eachMapping(function (mapping) {
-        if (lastMapping !== null) {
-          // We add the code from "lastMapping" to "mapping":
-          // First check if there is a new line in between.
-          if (lastGeneratedLine < mapping.generatedLine) {
-            var code = "";
-            // Associate first line with "lastMapping"
-            addMappingWithCode(lastMapping, shiftNextLine());
-            lastGeneratedLine++;
-            lastGeneratedColumn = 0;
-            // The remaining code is added without mapping
-          } else {
-            // There is no new line in between.
-            // Associate the code between "lastGeneratedColumn" and
-            // "mapping.generatedColumn" with "lastMapping"
-            var nextLine = remainingLines[0];
-            var code = nextLine.substr(0, mapping.generatedColumn -
-                                          lastGeneratedColumn);
-            remainingLines[0] = nextLine.substr(mapping.generatedColumn -
-                                                lastGeneratedColumn);
-            lastGeneratedColumn = mapping.generatedColumn;
-            addMappingWithCode(lastMapping, code);
-            // No more remaining code, continue
-            lastMapping = mapping;
-            return;
-          }
-        }
-        // We add the generated code until the first mapping
-        // to the SourceNode without any mapping.
-        // Each line is added as separate string.
-        while (lastGeneratedLine < mapping.generatedLine) {
-          node.add(shiftNextLine());
-          lastGeneratedLine++;
-        }
-        if (lastGeneratedColumn < mapping.generatedColumn) {
-          var nextLine = remainingLines[0];
-          node.add(nextLine.substr(0, mapping.generatedColumn));
-          remainingLines[0] = nextLine.substr(mapping.generatedColumn);
-          lastGeneratedColumn = mapping.generatedColumn;
-        }
-        lastMapping = mapping;
-      }, this);
-      // We have processed all mappings.
-      if (remainingLines.length > 0) {
-        if (lastMapping) {
-          // Associate the remaining code in the current line with "lastMapping"
-          addMappingWithCode(lastMapping, shiftNextLine());
-        }
-        // and add the remaining lines without any mapping
-        node.add(remainingLines.join(""));
-      }
-
-      // Copy sourcesContent into SourceNode
-      aSourceMapConsumer.sources.forEach(function (sourceFile) {
-        var content = aSourceMapConsumer.sourceContentFor(sourceFile);
-        if (content != null) {
-          if (aRelativePath != null) {
-            sourceFile = util.join(aRelativePath, sourceFile);
-          }
-          node.setSourceContent(sourceFile, content);
-        }
-      });
-
-      return node;
-
-      function addMappingWithCode(mapping, code) {
-        if (mapping === null || mapping.source === undefined) {
-          node.add(code);
-        } else {
-          var source = aRelativePath
-            ? util.join(aRelativePath, mapping.source)
-            : mapping.source;
-          node.add(new SourceNode(mapping.originalLine,
-                                  mapping.originalColumn,
-                                  source,
-                                  code,
-                                  mapping.name));
-        }
-      }
-    };
-
-  /**
-   * Add a chunk of generated JS to this source node.
-   *
-   * @param aChunk A string snippet of generated JS code, another instance of
-   *        SourceNode, or an array where each member is one of those things.
-   */
-  SourceNode.prototype.add = function SourceNode_add(aChunk) {
-    if (Array.isArray(aChunk)) {
-      aChunk.forEach(function (chunk) {
-        this.add(chunk);
-      }, this);
-    }
-    else if (aChunk[isSourceNode] || typeof aChunk === "string") {
-      if (aChunk) {
-        this.children.push(aChunk);
-      }
-    }
-    else {
-      throw new TypeError(
-        "Expected a SourceNode, string, or an array of SourceNodes and strings. Got " + aChunk
-      );
-    }
-    return this;
-  };
-
-  /**
-   * Add a chunk of generated JS to the beginning of this source node.
-   *
-   * @param aChunk A string snippet of generated JS code, another instance of
-   *        SourceNode, or an array where each member is one of those things.
-   */
-  SourceNode.prototype.prepend = function SourceNode_prepend(aChunk) {
-    if (Array.isArray(aChunk)) {
-      for (var i = aChunk.length-1; i >= 0; i--) {
-        this.prepend(aChunk[i]);
-      }
-    }
-    else if (aChunk[isSourceNode] || typeof aChunk === "string") {
-      this.children.unshift(aChunk);
-    }
-    else {
-      throw new TypeError(
-        "Expected a SourceNode, string, or an array of SourceNodes and strings. Got " + aChunk
-      );
-    }
-    return this;
-  };
-
-  /**
-   * Walk over the tree of JS snippets in this node and its children. The
-   * walking function is called once for each snippet of JS and is passed that
-   * snippet and the its original associated source's line/column location.
-   *
-   * @param aFn The traversal function.
-   */
-  SourceNode.prototype.walk = function SourceNode_walk(aFn) {
-    var chunk;
-    for (var i = 0, len = this.children.length; i < len; i++) {
-      chunk = this.children[i];
-      if (chunk[isSourceNode]) {
-        chunk.walk(aFn);
-      }
-      else {
-        if (chunk !== '') {
-          aFn(chunk, { source: this.source,
-                       line: this.line,
-                       column: this.column,
-                       name: this.name });
-        }
-      }
-    }
-  };
-
-  /**
-   * Like `String.prototype.join` except for SourceNodes. Inserts `aStr` between
-   * each of `this.children`.
-   *
-   * @param aSep The separator.
-   */
-  SourceNode.prototype.join = function SourceNode_join(aSep) {
-    var newChildren;
-    var i;
-    var len = this.children.length;
-    if (len > 0) {
-      newChildren = [];
-      for (i = 0; i < len-1; i++) {
-        newChildren.push(this.children[i]);
-        newChildren.push(aSep);
-      }
-      newChildren.push(this.children[i]);
-      this.children = newChildren;
-    }
-    return this;
-  };
-
-  /**
-   * Call String.prototype.replace on the very right-most source snippet. Useful
-   * for trimming whitespace from the end of a source node, etc.
-   *
-   * @param aPattern The pattern to replace.
-   * @param aReplacement The thing to replace the pattern with.
-   */
-  SourceNode.prototype.replaceRight = function SourceNode_replaceRight(aPattern, aReplacement) {
-    var lastChild = this.children[this.children.length - 1];
-    if (lastChild[isSourceNode]) {
-      lastChild.replaceRight(aPattern, aReplacement);
-    }
-    else if (typeof lastChild === 'string') {
-      this.children[this.children.length - 1] = lastChild.replace(aPattern, aReplacement);
-    }
-    else {
-      this.children.push(''.replace(aPattern, aReplacement));
-    }
-    return this;
-  };
-
-  /**
-   * Set the source content for a source file. This will be added to the SourceMapGenerator
-   * in the sourcesContent field.
-   *
-   * @param aSourceFile The filename of the source file
-   * @param aSourceContent The content of the source file
-   */
-  SourceNode.prototype.setSourceContent =
-    function SourceNode_setSourceContent(aSourceFile, aSourceContent) {
-      this.sourceContents[util.toSetString(aSourceFile)] = aSourceContent;
-    };
-
-  /**
-   * Walk over the tree of SourceNodes. The walking function is called for each
-   * source file content and is passed the filename and source content.
-   *
-   * @param aFn The traversal function.
-   */
-  SourceNode.prototype.walkSourceContents =
-    function SourceNode_walkSourceContents(aFn) {
-      for (var i = 0, len = this.children.length; i < len; i++) {
-        if (this.children[i][isSourceNode]) {
-          this.children[i].walkSourceContents(aFn);
-        }
-      }
-
-      var sources = Object.keys(this.sourceContents);
-      for (var i = 0, len = sources.length; i < len; i++) {
-        aFn(util.fromSetString(sources[i]), this.sourceContents[sources[i]]);
-      }
-    };
-
-  /**
-   * Return the string representation of this source node. Walks over the tree
-   * and concatenates all the various snippets together to one string.
-   */
-  SourceNode.prototype.toString = function SourceNode_toString() {
-    var str = "";
-    this.walk(function (chunk) {
-      str += chunk;
-    });
-    return str;
-  };
-
-  /**
-   * Returns the string representation of this source node along with a source
-   * map.
-   */
-  SourceNode.prototype.toStringWithSourceMap = function SourceNode_toStringWithSourceMap(aArgs) {
-    var generated = {
-      code: "",
-      line: 1,
-      column: 0
-    };
-    var map = new SourceMapGenerator(aArgs);
-    var sourceMappingActive = false;
-    var lastOriginalSource = null;
-    var lastOriginalLine = null;
-    var lastOriginalColumn = null;
-    var lastOriginalName = null;
-    this.walk(function (chunk, original) {
-      generated.code += chunk;
-      if (original.source !== null
-          && original.line !== null
-          && original.column !== null) {
-        if(lastOriginalSource !== original.source
-           || lastOriginalLine !== original.line
-           || lastOriginalColumn !== original.column
-           || lastOriginalName !== original.name) {
-          map.addMapping({
-            source: original.source,
-            original: {
-              line: original.line,
-              column: original.column
-            },
-            generated: {
-              line: generated.line,
-              column: generated.column
-            },
-            name: original.name
-          });
-        }
-        lastOriginalSource = original.source;
-        lastOriginalLine = original.line;
-        lastOriginalColumn = original.column;
-        lastOriginalName = original.name;
-        sourceMappingActive = true;
-      } else if (sourceMappingActive) {
-        map.addMapping({
-          generated: {
-            line: generated.line,
-            column: generated.column
-          }
-        });
-        lastOriginalSource = null;
-        sourceMappingActive = false;
-      }
-      for (var idx = 0, length = chunk.length; idx < length; idx++) {
-        if (chunk.charCodeAt(idx) === NEWLINE_CODE) {
-          generated.line++;
-          generated.column = 0;
-          // Mappings end at eol
-          if (idx + 1 === length) {
-            lastOriginalSource = null;
-            sourceMappingActive = false;
-          } else if (sourceMappingActive) {
-            map.addMapping({
-              source: original.source,
-              original: {
-                line: original.line,
-                column: original.column
-              },
-              generated: {
-                line: generated.line,
-                column: generated.column
-              },
-              name: original.name
-            });
-          }
-        } else {
-          generated.column++;
-        }
-      }
-    });
-    this.walkSourceContents(function (sourceFile, sourceContent) {
-      map.setSourceContent(sourceFile, sourceContent);
-    });
-
-    return { code: generated.code, map: map };
-  };
-
-  exports.SourceNode = SourceNode;
-
-});
-/* -*- Mode: js; js-indent-level: 2; -*- */
-///////////////////////////////////////////////////////////////////////////////
-
-this.SourceMapConsumer = require('source-map/source-map-consumer').SourceMapConsumer;
-this.SourceMapGenerator = require('source-map/source-map-generator').SourceMapGenerator;
-this.SourceNode = require('source-map/source-node').SourceNode;
--- a/toolkit/devtools/sourcemap/UPGRADING.md
+++ b/toolkit/devtools/sourcemap/UPGRADING.md
@@ -1,12 +1,13 @@
 Rather than make changes to the built files here, make them upstream and then
 upgrade our tree's copy of the built files.
 
 To upgrade the source-map library:
 
     $ git clone https://github.com/mozilla/source-map.git
-    $ git co source-map
-    $ git co <latest-tagged-version>
-    $ npm run-script build
-    $ cp dist/SourceMap.jsm /path/to/mozilla-central/toolkit/devtools/sourcemap/SourceMap.jsm
+    $ cd source-map
+    $ git checkout <latest-tagged-version>
+    $ npm install
+    $ npm run-script build  -or-  nodejs Makefile.dryice.js (if you have issues with npm)
+    $ cp dist/source-map.js /path/to/mozilla-central/toolkit/devtools/sourcemap/source-map.js
     $ cp dist/test/* /path/to/mozilla-central/toolkit/devtools/sourcemap/tests/unit/
 
--- a/toolkit/devtools/sourcemap/moz.build
+++ b/toolkit/devtools/sourcemap/moz.build
@@ -1,15 +1,11 @@
 # -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
 # vim: set filetype=python:
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 XPCSHELL_TESTS_MANIFESTS += ['tests/unit/xpcshell.ini']
 
-EXTRA_JS_MODULES.devtools += [
-    'SourceMap.jsm',
-]
-
-EXTRA_JS_MODULES.devtools += [
+EXTRA_JS_MODULES.devtools.sourcemap += [
     'source-map.js',
 ]
--- a/toolkit/devtools/sourcemap/source-map.js
+++ b/toolkit/devtools/sourcemap/source-map.js
@@ -441,30 +441,29 @@ define('source-map/source-map-generator'
       var previousOriginalColumn = 0;
       var previousOriginalLine = 0;
       var previousName = 0;
       var previousSource = 0;
       var result = '';
       var mapping;
 
       var mappings = this._mappings.toArray();
-
       for (var i = 0, len = mappings.length; i < len; i++) {
         mapping = mappings[i];
 
         if (mapping.generatedLine !== previousGeneratedLine) {
           previousGeneratedColumn = 0;
           while (mapping.generatedLine !== previousGeneratedLine) {
             result += ';';
             previousGeneratedLine++;
           }
         }
         else {
           if (i > 0) {
-            if (!util.compareByGeneratedPositions(mapping, mappings[i - 1])) {
+            if (!util.compareByGeneratedPositionsInflated(mapping, mappings[i - 1])) {
               continue;
             }
             result += ',';
           }
         }
 
         result += base64VLQ.encode(mapping.generatedColumn
                                    - previousGeneratedColumn);
@@ -668,17 +667,22 @@ define('source-map/base64-vlq', ['requir
     var result = 0;
     var shift = 0;
     var continuation, digit;
 
     do {
       if (aIndex >= strLen) {
         throw new Error("Expected more digits in base 64 VLQ value.");
       }
-      digit = base64.decode(aStr.charAt(aIndex++));
+
+      digit = base64.decode(aStr.charCodeAt(aIndex++));
+      if (digit === -1) {
+        throw new Error("Invalid base64 digit: " + aStr.charAt(aIndex - 1));
+      }
+
       continuation = !!(digit & VLQ_CONTINUATION_BIT);
       digit &= VLQ_BASE_MASK;
       result = result + (digit << shift);
       shift += VLQ_BASE_SHIFT;
     } while (continuation);
 
     aOutParam.value = fromVLQSigned(result);
     aOutParam.rest = aIndex;
@@ -688,44 +692,75 @@ define('source-map/base64-vlq', ['requir
 /* -*- Mode: js; js-indent-level: 2; -*- */
 /*
  * Copyright 2011 Mozilla Foundation and contributors
  * Licensed under the New BSD license. See LICENSE or:
  * http://opensource.org/licenses/BSD-3-Clause
  */
 define('source-map/base64', ['require', 'exports', 'module' , ], function(require, exports, module) {
 
-  var charToIntMap = {};
-  var intToCharMap = {};
-
-  'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
-    .split('')
-    .forEach(function (ch, index) {
-      charToIntMap[ch] = index;
-      intToCharMap[index] = ch;
-    });
+  var intToCharMap = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split('');
 
   /**
    * Encode an integer in the range of 0 to 63 to a single base 64 digit.
    */
-  exports.encode = function base64_encode(aNumber) {
-    if (aNumber in intToCharMap) {
-      return intToCharMap[aNumber];
+  exports.encode = function (number) {
+    if (0 <= number && number < intToCharMap.length) {
+      return intToCharMap[number];
     }
     throw new TypeError("Must be between 0 and 63: " + aNumber);
   };
 
   /**
-   * Decode a single base 64 digit to an integer.
+   * Decode a single base 64 character code digit to an integer. Returns -1 on
+   * failure.
    */
-  exports.decode = function base64_decode(aChar) {
-    if (aChar in charToIntMap) {
-      return charToIntMap[aChar];
+  exports.decode = function (charCode) {
+    var bigA = 65;     // 'A'
+    var bigZ = 90;     // 'Z'
+
+    var littleA = 97;  // 'a'
+    var littleZ = 122; // 'z'
+
+    var zero = 48;     // '0'
+    var nine = 57;     // '9'
+
+    var plus = 43;     // '+'
+    var slash = 47;    // '/'
+
+    var littleOffset = 26;
+    var numberOffset = 52;
+
+    // 0 - 25: ABCDEFGHIJKLMNOPQRSTUVWXYZ
+    if (bigA <= charCode && charCode <= bigZ) {
+      return (charCode - bigA);
     }
-    throw new TypeError("Not a valid base 64 digit: " + aChar);
+
+    // 26 - 51: abcdefghijklmnopqrstuvwxyz
+    if (littleA <= charCode && charCode <= littleZ) {
+      return (charCode - littleA + littleOffset);
+    }
+
+    // 52 - 61: 0123456789
+    if (zero <= charCode && charCode <= nine) {
+      return (charCode - zero + numberOffset);
+    }
+
+    // 62: +
+    if (charCode == plus) {
+      return 62;
+    }
+
+    // 63: /
+    if (charCode == slash) {
+      return 63;
+    }
+
+    // Invalid base64 digit.
+    return -1;
   };
 
 });
 /* -*- Mode: js; js-indent-level: 2; -*- */
 /*
  * Copyright 2011 Mozilla Foundation and contributors
  * Licensed under the New BSD license. See LICENSE or:
  * http://opensource.org/licenses/BSD-3-Clause
@@ -931,17 +966,17 @@ define('source-map/util', ['require', 'e
       if (index < 0) {
         return aPath;
       }
 
       // If the only part of the root that is left is the scheme (i.e. http://,
       // file:///, etc.), one or more slashes (/), or simply nothing at all, we
       // have exhausted all components, so the path is not relative to the root.
       aRoot = aRoot.slice(0, index);
-      if (aRoot.match(/^([^\/]+:\/)\/*$/)) {
+      if (aRoot.match(/^([^\/]+:\/)?\/*$/)) {
         return aPath;
       }
 
       ++level;
     }
 
     // Make sure we add a "../" for each component we removed from the root.
     return Array(level + 1).join("../") + aPath.substr(aRoot.length + 1);
@@ -962,102 +997,138 @@ define('source-map/util', ['require', 'e
   }
   exports.toSetString = toSetString;
 
   function fromSetString(aStr) {
     return aStr.substr(1);
   }
   exports.fromSetString = fromSetString;
 
-  function strcmp(aStr1, aStr2) {
-    var s1 = aStr1 || "";
-    var s2 = aStr2 || "";
-    return (s1 > s2) - (s1 < s2);
-  }
-
   /**
    * Comparator between two mappings where the original positions are compared.
    *
    * Optionally pass in `true` as `onlyCompareGenerated` to consider two
    * mappings with the same original source/line/column, but different generated
    * line and column the same. Useful when searching for a mapping with a
    * stubbed out mapping.
    */
   function compareByOriginalPositions(mappingA, mappingB, onlyCompareOriginal) {
-    var cmp;
-
-    cmp = strcmp(mappingA.source, mappingB.source);
-    if (cmp) {
+    var cmp = mappingA.source - mappingB.source;
+    if (cmp !== 0) {
       return cmp;
     }
 
     cmp = mappingA.originalLine - mappingB.originalLine;
-    if (cmp) {
+    if (cmp !== 0) {
       return cmp;
     }
 
     cmp = mappingA.originalColumn - mappingB.originalColumn;
-    if (cmp || onlyCompareOriginal) {
+    if (cmp !== 0 || onlyCompareOriginal) {
       return cmp;
     }
 
     cmp = mappingA.generatedColumn - mappingB.generatedColumn;
-    if (cmp) {
+    if (cmp !== 0) {
       return cmp;
     }
 
     cmp = mappingA.generatedLine - mappingB.generatedLine;
-    if (cmp) {
+    if (cmp !== 0) {
       return cmp;
     }
 
-    return strcmp(mappingA.name, mappingB.name);
+    return mappingA.name - mappingB.name;
   };
   exports.compareByOriginalPositions = compareByOriginalPositions;
 
   /**
-   * Comparator between two mappings where the generated positions are
-   * compared.
+   * Comparator between two mappings with deflated source and name indices where
+   * the generated positions are compared.
    *
    * Optionally pass in `true` as `onlyCompareGenerated` to consider two
    * mappings with the same generated line and column, but different
    * source/name/original line and column the same. Useful when searching for a
    * mapping with a stubbed out mapping.
    */
-  function compareByGeneratedPositions(mappingA, mappingB, onlyCompareGenerated) {
-    var cmp;
-
-    cmp = mappingA.generatedLine - mappingB.generatedLine;
-    if (cmp) {
+  function compareByGeneratedPositionsDeflated(mappingA, mappingB, onlyCompareGenerated) {
+    var cmp = mappingA.generatedLine - mappingB.generatedLine;
+    if (cmp !== 0) {
       return cmp;
     }
 
     cmp = mappingA.generatedColumn - mappingB.generatedColumn;
-    if (cmp || onlyCompareGenerated) {
+    if (cmp !== 0 || onlyCompareGenerated) {
+      return cmp;
+    }
+
+    cmp = mappingA.source - mappingB.source;
+    if (cmp !== 0) {
+      return cmp;
+    }
+
+    cmp = mappingA.originalLine - mappingB.originalLine;
+    if (cmp !== 0) {
+      return cmp;
+    }
+
+    cmp = mappingA.originalColumn - mappingB.originalColumn;
+    if (cmp !== 0) {
+      return cmp;
+    }
+
+    return mappingA.name - mappingB.name;
+  };
+  exports.compareByGeneratedPositionsDeflated = compareByGeneratedPositionsDeflated;
+
+  function strcmp(aStr1, aStr2) {
+    if (aStr1 === aStr2) {
+      return 0;
+    }
+
+    if (aStr1 > aStr2) {
+      return 1;
+    }
+
+    return -1;
+  }
+
+  /**
+   * Comparator between two mappings with inflated source and name strings where
+   * the generated positions are compared.
+   */
+  function compareByGeneratedPositionsInflated(mappingA, mappingB) {
+    var cmp = mappingA.generatedLine - mappingB.generatedLine;
+    if (cmp !== 0) {
+      return cmp;
+    }
+
+    cmp = mappingA.generatedColumn - mappingB.generatedColumn;
+    if (cmp !== 0) {
       return cmp;
     }
 
     cmp = strcmp(mappingA.source, mappingB.source);
-    if (cmp) {
+    if (cmp !== 0) {
       return cmp;
     }
 
     cmp = mappingA.originalLine - mappingB.originalLine;
-    if (cmp) {
+    if (cmp !== 0) {
       return cmp;
     }
 
     cmp = mappingA.originalColumn - mappingB.originalColumn;
-    if (cmp) {
+    if (cmp !== 0) {
       return cmp;
     }
 
     return strcmp(mappingA.name, mappingB.name);
   };
-  exports.compareByGeneratedPositions = compareByGeneratedPositions;
+  exports.compareByGeneratedPositionsInflated = compareByGeneratedPositionsInflated;
 
 });
 /* -*- Mode: js; js-indent-level: 2; -*- */
 /*
  * Copyright 2011 Mozilla Foundation and contributors
  * Licensed under the New BSD license. See LICENSE or:
  * http://opensource.org/licenses/BSD-3-Clause
  */
@@ -1083,16 +1154,26 @@ define('source-map/array-set', ['require
     var set = new ArraySet();
     for (var i = 0, len = aArray.length; i < len; i++) {
       set.add(aArray[i], aAllowDuplicates);
     }
     return set;
   };
 
   /**
+   * Return how many unique items are in this ArraySet. If duplicates have been
+   * added, than those do not count towards the size.
+   *
+   * @returns Number
+   */
+  ArraySet.prototype.size = function ArraySet_size() {
+    return Object.getOwnPropertyNames(this._set).length;
+  };
+
+  /**
    * Add the given string to this set.
    *
    * @param String aStr
    */
   ArraySet.prototype.add = function ArraySet_add(aStr, aAllowDuplicates) {
     var isDuplicate = this.has(aStr);
     var idx = this._array.length;
     if (!isDuplicate || aAllowDuplicates) {
@@ -1165,17 +1246,17 @@ define('source-map/mapping-list', ['requ
    */
   function generatedPositionAfter(mappingA, mappingB) {
     // Optimized for most common case
     var lineA = mappingA.generatedLine;
     var lineB = mappingB.generatedLine;
     var columnA = mappingA.generatedColumn;
     var columnB = mappingB.generatedColumn;
     return lineB > lineA || lineB == lineA && columnB >= columnA ||
-           util.compareByGeneratedPositions(mappingA, mappingB) <= 0;
+           util.compareByGeneratedPositionsInflated(mappingA, mappingB) <= 0;
   }
 
   /**
    * A data structure to provide a sorted view of accumulated mappings in a
    * performance conscious manner. It trades a neglibable overhead in general
    * case for a large speedup in case of mappings being added in order.
    */
   function MappingList() {
@@ -1218,37 +1299,38 @@ define('source-map/mapping-list', ['requ
    *
    * WARNING: This method returns internal data without copying, for
    * performance. The return value must NOT be mutated, and should be treated as
    * an immutable borrow. If you want to take ownership, you must make your own
    * copy.
    */
   MappingList.prototype.toArray = function MappingList_toArray() {
     if (!this._sorted) {
-      this._array.sort(util.compareByGeneratedPositions);
+      this._array.sort(util.compareByGeneratedPositionsInflated);
       this._sorted = true;
     }
     return this._array;
   };
 
   exports.MappingList = MappingList;
 
 });
 /* -*- Mode: js; js-indent-level: 2; -*- */
 /*
  * Copyright 2011 Mozilla Foundation and contributors
  * Licensed under the New BSD license. See LICENSE or:
  * http://opensource.org/licenses/BSD-3-Clause
  */
-define('source-map/source-map-consumer', ['require', 'exports', 'module' ,  'source-map/util', 'source-map/binary-search', 'source-map/array-set', 'source-map/base64-vlq'], function(require, exports, module) {
+define('source-map/source-map-consumer', ['require', 'exports', 'module' ,  'source-map/util', 'source-map/binary-search', 'source-map/array-set', 'source-map/base64-vlq', 'source-map/quick-sort'], function(require, exports, module) {
 
   var util = require('./util');
   var binarySearch = require('./binary-search');
   var ArraySet = require('./array-set').ArraySet;
   var base64VLQ = require('./base64-vlq');
+  var quickSort = require('./quick-sort').quickSort;
 
   function SourceMapConsumer(aSourceMap) {
     var sourceMap = aSourceMap;
     if (typeof aSourceMap === 'string') {
       sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
     }
 
     return sourceMap.sections != null
@@ -1294,40 +1376,36 @@ define('source-map/source-map-consumer',
   // `_generatedMappings` is ordered by the generated positions.
   //
   // `_originalMappings` is ordered by the original positions.
 
   SourceMapConsumer.prototype.__generatedMappings = null;
   Object.defineProperty(SourceMapConsumer.prototype, '_generatedMappings', {
     get: function () {
       if (!this.__generatedMappings) {
-        this.__generatedMappings = [];
-        this.__originalMappings = [];
         this._parseMappings(this._mappings, this.sourceRoot);
       }
 
       return this.__generatedMappings;
     }
   });
 
   SourceMapConsumer.prototype.__originalMappings = null;
   Object.defineProperty(SourceMapConsumer.prototype, '_originalMappings', {
     get: function () {
       if (!this.__originalMappings) {
-        this.__generatedMappings = [];
-        this.__originalMappings = [];
         this._parseMappings(this._mappings, this.sourceRoot);
       }
 
       return this.__originalMappings;
     }
   });
 
-  SourceMapConsumer.prototype._nextCharIsMappingSeparator =
-    function SourceMapConsumer_nextCharIsMappingSeparator(aStr, index) {
+  SourceMapConsumer.prototype._charIsMappingSeparator =
+    function SourceMapConsumer_charIsMappingSeparator(aStr, index) {
       var c = aStr.charAt(index);
       return c === ";" || c === ",";
     };
 
   /**
    * Parse the mappings in a string in to a data structure which we can easily
    * query (the ordered arrays in the `this.__generatedMappings` and
    * `this.__originalMappings` properties).
@@ -1373,29 +1451,29 @@ define('source-map/source-map-consumer',
         mappings = this._originalMappings;
         break;
       default:
         throw new Error("Unknown order of iteration.");
       }
 
       var sourceRoot = this.sourceRoot;
       mappings.map(function (mapping) {
-        var source = mapping.source;
+        var source = mapping.source === null ? null : this._sources.at(mapping.source);
         if (source != null && sourceRoot != null) {
           source = util.join(sourceRoot, source);
         }
         return {
           source: source,
           generatedLine: mapping.generatedLine,
           generatedColumn: mapping.generatedColumn,
           originalLine: mapping.originalLine,
           originalColumn: mapping.originalColumn,
-          name: mapping.name
+          name: mapping.name === null ? null : this._names.at(mapping.name)
         };
-      }).forEach(aCallback, context);
+      }, this).forEach(aCallback, context);
     };
 
   /**
    * Returns all generated line and column information for the original source,
    * line, and column provided. If no column is provided, returns all mappings
    * corresponding to a either the line we are searching for or the next
    * closest line that has any mappings. Otherwise, returns all mappings
    * corresponding to the given line and either the column we are searching for
@@ -1424,16 +1502,20 @@ define('source-map/source-map-consumer',
         source: util.getArg(aArgs, 'source'),
         originalLine: line,
         originalColumn: util.getArg(aArgs, 'column', 0)
       };
 
       if (this.sourceRoot != null) {
         needle.source = util.relative(this.sourceRoot, needle.source);
       }
+      if (!this._sources.has(needle.source)) {
+        return [];
+      }
+      needle.source = this._sources.indexOf(needle.source);
 
       var mappings = [];
 
       var index = this._findMapping(needle,
                                     this._originalMappings,
                                     "originalLine",
                                     "originalColumn",
                                     util.compareByOriginalPositions,
@@ -1562,26 +1644,54 @@ define('source-map/source-map-consumer',
    * @param SourceMapGenerator aSourceMap
    *        The source map that will be consumed.
    * @returns BasicSourceMapConsumer
    */
   BasicSourceMapConsumer.fromSourceMap =
     function SourceMapConsumer_fromSourceMap(aSourceMap) {
       var smc = Object.create(BasicSourceMapConsumer.prototype);
 
-      smc._names = ArraySet.fromArray(aSourceMap._names.toArray(), true);
-      smc._sources = ArraySet.fromArray(aSourceMap._sources.toArray(), true);
+      var names = smc._names = ArraySet.fromArray(aSourceMap._names.toArray(), true);
+      var sources = smc._sources = ArraySet.fromArray(aSourceMap._sources.toArray(), true);
       smc.sourceRoot = aSourceMap._sourceRoot;
       smc.sourcesContent = aSourceMap._generateSourcesContent(smc._sources.toArray(),
                                                               smc.sourceRoot);
       smc.file = aSourceMap._file;
 
-      smc.__generatedMappings = aSourceMap._mappings.toArray().slice();
-      smc.__originalMappings = aSourceMap._mappings.toArray().slice()
-        .sort(util.compareByOriginalPositions);
+      // Because we are modifying the entries (by converting string sources and
+      // names to indices into the sources and names ArraySets), we have to make
+      // a copy of the entry or else bad things happen. Shared mutable state
+      // strikes again! See github issue #191.
+
+      var generatedMappings = aSourceMap._mappings.toArray().slice();
+      var destGeneratedMappings = smc.__generatedMappings = [];
+      var destOriginalMappings = smc.__originalMappings = [];
+
+      for (var i = 0, length = generatedMappings.length; i < length; i++) {
+        var srcMapping = generatedMappings[i];
+        var destMapping = new Mapping;
+        destMapping.generatedLine = srcMapping.generatedLine;
+        destMapping.generatedColumn = srcMapping.generatedColumn;
+
+        if (srcMapping.source) {
+          destMapping.source = sources.indexOf(srcMapping.source);
+          destMapping.originalLine = srcMapping.originalLine;
+          destMapping.originalColumn = srcMapping.originalColumn;
+
+          if (srcMapping.name) {
+            destMapping.name = names.indexOf(srcMapping.name);
+          }
+
+          destOriginalMappings.push(destMapping);
+        }
+
+        destGeneratedMappings.push(destMapping);
+      }
+
+      quickSort(smc.__originalMappings, util.compareByOriginalPositions);
 
       return smc;
     };
 
   /**
    * The version of the source mapping spec that we are consuming.
    */
   BasicSourceMapConsumer.prototype._version = 3;
@@ -1593,114 +1703,134 @@ define('source-map/source-map-consumer',
     get: function () {
       return this._sources.toArray().map(function (s) {
         return this.sourceRoot != null ? util.join(this.sourceRoot, s) : s;
       }, this);
     }
   });
 
   /**
+   * Provide the JIT with a nice shape / hidden class.
+   */
+  function Mapping() {
+    this.generatedLine = 0;
+    this.generatedColumn = 0;
+    this.source = null;
+    this.originalLine = null;
+    this.originalColumn = null;
+    this.name = null;
+  }
+
+  /**
    * Parse the mappings in a string in to a data structure which we can easily
    * query (the ordered arrays in the `this.__generatedMappings` and
    * `this.__originalMappings` properties).
    */
   BasicSourceMapConsumer.prototype._parseMappings =
     function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
       var generatedLine = 1;
       var previousGeneratedColumn = 0;
       var previousOriginalLine = 0;
       var previousOriginalColumn = 0;
       var previousSource = 0;
       var previousName = 0;
       var length = aStr.length;
       var index = 0;
-      var cachedValues = {};
+      var cachedSegments = {};
       var temp = {};
-      var mapping, str, values, end, value;
+      var originalMappings = [];
+      var generatedMappings = [];
+      var mapping, str, segment, end, value;
 
       while (index < length) {
         if (aStr.charAt(index) === ';') {
           generatedLine++;
-          ++index;
+          index++;
           previousGeneratedColumn = 0;
         }
         else if (aStr.charAt(index) === ',') {
-          ++index;
+          index++;
         }
         else {
-          mapping = {};
+          mapping = new Mapping();
           mapping.generatedLine = generatedLine;
 
           // Because each offset is encoded relative to the previous one,
           // many segments often have the same encoding. We can exploit this
           // fact by caching the parsed variable length fields of each segment,
           // allowing us to avoid a second parse if we encounter the same
           // segment again.
-          for (end = index; end < length; ++end) {
-            if (this._nextCharIsMappingSeparator(aStr, end)) {
+          for (end = index; end < length; end++) {
+            if (this._charIsMappingSeparator(aStr, end)) {
               break;
             }
           }
           str = aStr.slice(index, end);
 
-          values = cachedValues[str];
-          if (values) {
+          segment = cachedSegments[str];
+          if (segment) {
             index += str.length;
           } else {
-            values = [];
+            segment = [];
             while (index < end) {
               base64VLQ.decode(aStr, index, temp);
               value = temp.value;
               index = temp.rest;
-              values.push(value);
+              segment.push(value);
             }
-            cachedValues[str] = values;
-          }
 
-          // Generated column.
-          mapping.generatedColumn = previousGeneratedColumn + values[0];
-          previousGeneratedColumn = mapping.generatedColumn;
-
-          if (values.length > 1) {
-            // Original source.
-            mapping.source = this._sources.at(previousSource + values[1]);
-            previousSource += values[1];
-            if (values.length === 2) {
+            if (segment.length === 2) {
               throw new Error('Found a source, but no line and column');
             }
 
-            // Original line.
-            mapping.originalLine = previousOriginalLine + values[2];
-            previousOriginalLine = mapping.originalLine;
-            // Lines are stored 0-based
-            mapping.originalLine += 1;
-            if (values.length === 3) {
+            if (segment.length === 3) {
               throw new Error('Found a source and line, but no column');
             }
 
+            cachedSegments[str] = segment;
+          }
+
+          // Generated column.
+          mapping.generatedColumn = previousGeneratedColumn + segment[0];
+          previousGeneratedColumn = mapping.generatedColumn;
+
+          if (segment.length > 1) {
+            // Original source.
+            mapping.source = previousSource + segment[1];
+            previousSource += segment[1];
+
+            // Original line.
+            mapping.originalLine = previousOriginalLine + segment[2];
+            previousOriginalLine = mapping.originalLine;
+            // Lines are stored 0-based
+            mapping.originalLine += 1;
+
             // Original column.
-            mapping.originalColumn = previousOriginalColumn + values[3];
+            mapping.originalColumn = previousOriginalColumn + segment[3];
             previousOriginalColumn = mapping.originalColumn;
 
-            if (values.length > 4) {
+            if (segment.length > 4) {
               // Original name.
-              mapping.name = this._names.at(previousName + values[4]);
-              previousName += values[4];
+              mapping.name = previousName + segment[4];
+              previousName += segment[4];
             }
           }
 
-          this.__generatedMappings.push(mapping);
+          generatedMappings.push(mapping);
           if (typeof mapping.originalLine === 'number') {
-            this.__originalMappings.push(mapping);
+            originalMappings.push(mapping);
           }
         }
       }
 
-      this.__generatedMappings.sort(util.compareByGeneratedPositions);
-      this.__originalMappings.sort(util.compareByOriginalPositions);
+      quickSort(generatedMappings, util.compareByGeneratedPositionsDeflated);
+      this.__generatedMappings = generatedMappings;
+
+      quickSort(originalMappings, util.compareByOriginalPositions);
+      this.__originalMappings = originalMappings;
     };
 
   /**
    * Find the mapping that best matches the hypothetical "needle" mapping that
    * we are searching for in the given "haystack" of mappings.
    */
   BasicSourceMapConsumer.prototype._findMapping =
     function SourceMapConsumer_findMapping(aNeedle, aMappings, aLineName,
@@ -1776,46 +1906,66 @@ define('source-map/source-map-consumer',
         generatedColumn: util.getArg(aArgs, 'column')
       };
 
       var index = this._findMapping(
         needle,
         this._generatedMappings,
         "generatedLine",
         "generatedColumn",
-        util.compareByGeneratedPositions,
+        util.compareByGeneratedPositionsDeflated,
         util.getArg(aArgs, 'bias', SourceMapConsumer.GREATEST_LOWER_BOUND)
       );
 
       if (index >= 0) {
         var mapping = this._generatedMappings[index];
 
         if (mapping.generatedLine === needle.generatedLine) {
           var source = util.getArg(mapping, 'source', null);
-          if (source != null && this.sourceRoot != null) {
-            source = util.join(this.sourceRoot, source);
+          if (source !== null) {
+            source = this._sources.at(source);
+            if (this.sourceRoot != null) {
+              source = util.join(this.sourceRoot, source);
+            }
+          }
+          var name = util.getArg(mapping, 'name', null);
+          if (name !== null) {
+            name = this._names.at(name);
           }
           return {
             source: source,
             line: util.getArg(mapping, 'originalLine', null),
             column: util.getArg(mapping, 'originalColumn', null),
-            name: util.getArg(mapping, 'name', null)
+            name: name
           };
         }
       }
 
       return {
         source: null,
         line: null,
         column: null,
         name: null
       };
     };
 
   /**
+   * Return true if we have the source content for every source in the source
+   * map, false otherwise.
+   */
+  BasicSourceMapConsumer.prototype.hasContentsOfAllSources =
+    function BasicSourceMapConsumer_hasContentsOfAllSources() {
+      if (!this.sourcesContent) {
+        return false;
+      }
+      return this.sourcesContent.length >= this._sources.size() &&
+        !this.sourcesContent.some(function (sc) { return sc == null; });
+    };
+
+  /**
    * Returns the original source content. The only argument is the url of the
    * original source file. Returns null if no original source content is
    * availible.
    */
   BasicSourceMapConsumer.prototype.sourceContentFor =
     function SourceMapConsumer_sourceContentFor(aSource, nullOnMissing) {
       if (!this.sourcesContent) {
         return null;
@@ -1876,26 +2026,35 @@ define('source-map/source-map-consumer',
    *
    * and an object is returned with the following properties:
    *
    *   - line: The line number in the generated source, or null.
    *   - column: The column number in the generated source, or null.
    */
   BasicSourceMapConsumer.prototype.generatedPositionFor =
     function SourceMapConsumer_generatedPositionFor(aArgs) {
+      var source = util.getArg(aArgs, 'source');
+      if (this.sourceRoot != null) {
+        source = util.relative(this.sourceRoot, source);
+      }
+      if (!this._sources.has(source)) {
+        return {
+          line: null,
+          column: null,
+          lastColumn: null
+        };
+      }
+      source = this._sources.indexOf(source);
+
       var needle = {
-        source: util.getArg(aArgs, 'source'),
+        source: source,
         originalLine: util.getArg(aArgs, 'line'),
         originalColumn: util.getArg(aArgs, 'column')
       };
 
-      if (this.sourceRoot != null) {
-        needle.source = util.relative(this.sourceRoot, needle.source);
-      }
-
       var index = this._findMapping(
         needle,
         this._originalMappings,
         "originalLine",
         "originalColumn",
         util.compareByOriginalPositions,
         util.getArg(aArgs, 'bias', SourceMapConsumer.GREATEST_LOWER_BOUND)
       );
@@ -1974,16 +2133,19 @@ define('source-map/source-map-consumer',
 
     var version = util.getArg(sourceMap, 'version');
     var sections = util.getArg(sourceMap, 'sections');
 
     if (version != this._version) {
       throw new Error('Unsupported version: ' + version);
     }
 
+    this._sources = new ArraySet();
+    this._names = new ArraySet();
+
     var lastOffset = {
       line: -1,
       column: 0
     };
     this._sections = sections.map(function (s) {
       if (s.url) {
         // The url field will require support for asynchronicity.
         // See https://github.com/mozilla/source-map/issues/16
@@ -2086,16 +2248,27 @@ define('source-map/source-map-consumer',
           (section.generatedOffset.generatedLine === needle.generatedLine
            ? section.generatedOffset.generatedColumn - 1
            : 0),
         bias: aArgs.bias
       });
     };
 
   /**
+   * Return true if we have the source content for every source in the source
+   * map, false otherwise.
+   */
+  IndexedSourceMapConsumer.prototype.hasContentsOfAllSources =
+    function IndexedSourceMapConsumer_hasContentsOfAllSources() {
+      return this._sections.every(function (s) {
+        return s.consumer.hasContentsOfAllSources();
+      });
+    };
+
+  /**
    * Returns the original source content. The only argument is the url of the
    * original source file. Returns null if no original source content is
    * available.
    */
   IndexedSourceMapConsumer.prototype.sourceContentFor =
     function IndexedSourceMapConsumer_sourceContentFor(aSource, nullOnMissing) {
       for (var i = 0; i < this._sections.length; i++) {
         var section = this._sections[i];
@@ -2167,50 +2340,54 @@ define('source-map/source-map-consumer',
       this.__generatedMappings = [];
       this.__originalMappings = [];
       for (var i = 0; i < this._sections.length; i++) {
         var section = this._sections[i];
         var sectionMappings = section.consumer._generatedMappings;
         for (var j = 0; j < sectionMappings.length; j++) {
           var mapping = sectionMappings[i];
 
-          var source = mapping.source;
-          var sourceRoot = section.consumer.sourceRoot;
+          var source = section.consumer._sources.at(mapping.source);
+          if (section.consumer.sourceRoot !== null) {
+            source = util.join(section.consumer.sourceRoot, source);
+          }
+          this._sources.add(source);
+          source = this._sources.indexOf(source);
 
-          if (source != null && sourceRoot != null) {
-            source = util.join(sourceRoot, source);
-          }
+          var name = section.consumer._names.at(mapping.name);
+          this._names.add(name);
+          name = this._names.indexOf(name);
 
           // The mappings coming from the consumer for the section have
           // generated positions relative to the start of the section, so we
           // need to offset them to be relative to the start of the concatenated
           // generated file.
           var adjustedMapping = {
             source: source,
             generatedLine: mapping.generatedLine +
               (section.generatedOffset.generatedLine - 1),
             generatedColumn: mapping.column +
               (section.generatedOffset.generatedLine === mapping.generatedLine)
               ? section.generatedOffset.generatedColumn - 1
               : 0,
             originalLine: mapping.originalLine,
             originalColumn: mapping.originalColumn,
-            name: mapping.name
+            name: name
           };
 
           this.__generatedMappings.push(adjustedMapping);
           if (typeof adjustedMapping.originalLine === 'number') {
             this.__originalMappings.push(adjustedMapping);
           }
         };
       };
 
-    this.__generatedMappings.sort(util.compareByGeneratedPositions);
-    this.__originalMappings.sort(util.compareByOriginalPositions);
-  };
+      quickSort(this.__generatedMappings, util.compareByGeneratedPositionsDeflated);
+      quickSort(this.__originalMappings, util.compareByOriginalPositions);
+    };
 
   exports.IndexedSourceMapConsumer = IndexedSourceMapConsumer;
 
 });
 /* -*- Mode: js; js-indent-level: 2; -*- */
 /*
  * Copyright 2011 Mozilla Foundation and contributors
  * Licensed under the New BSD license. See LICENSE or:
@@ -2325,16 +2502,133 @@ define('source-map/binary-search', ['req
 
 });
 /* -*- Mode: js; js-indent-level: 2; -*- */
 /*
  * Copyright 2011 Mozilla Foundation and contributors
  * Licensed under the New BSD license. See LICENSE or:
  * http://opensource.org/licenses/BSD-3-Clause
  */
+define('source-map/quick-sort', ['require', 'exports', 'module' , ], function(require, exports, module) {
+
+  // It turns out that some (most?) JavaScript engines don't self-host
+  // `Array.prototype.sort`. This makes sense because C++ will likely remain
+  // faster than JS when doing raw CPU-intensive sorting. However, when using a
+  // custom comparator function, calling back and forth between the VM's C++ and
+  // JIT'd JS is rather slow *and* loses JIT type information, resulting in
+  // worse generated code for the comparator function than would be optimal. In
+  // fact, when sorting with a comparator, these costs outweigh the benefits of
+  // sorting in C++. By using our own JS-implemented Quick Sort (below), we get
+  // a ~3500ms mean speed-up in `bench/bench.html`.
+
+  /**
+   * Swap the elements indexed by `x` and `y` in the array `ary`.
+   *
+   * @param {Array} ary
+   *        The array.
+   * @param {Number} x
+   *        The index of the first item.
+   * @param {Number} y
+   *        The index of the second item.
+   */
+  function swap(ary, x, y) {
+    var temp = ary[x];
+    ary[x] = ary[y];
+    ary[y] = temp;
+  }
+
+  /**
+   * Returns a random integer within the range `low .. high` inclusive.
+   *
+   * @param {Number} low
+   *        The lower bound on the range.
+   * @param {Number} high
+   *        The upper bound on the range.
+   */
+  function randomIntInRange(low, high) {
+    return Math.round(low + (Math.random() * (high - low)));
+  }
+
+  /**
+   * The Quick Sort algorithm.
+   *
+   * @param {Array} ary
+   *        An array to sort.
+   * @param {function} comparator
+   *        Function to use to compare two items.
+   * @param {Number} p
+   *        Start index of the array
+   * @param {Number} r
+   *        End index of the array
+   */
+  function doQuickSort(ary, comparator, p, r) {
+    // If our lower bound is less than our upper bound, we (1) partition the
+    // array into two pieces and (2) recurse on each half. If it is not, this is
+    // the empty array and our base case.
+
+    if (p < r) {
+      // (1) Partitioning.
+      //
+      // The partitioning chooses a pivot between `p` and `r` and moves all
+      // elements that are less than or equal to the pivot to the before it, and
+      // all the elements that are greater than it after it. The effect is that
+      // once partition is done, the pivot is in the exact place it will be when
+      // the array is put in sorted order, and it will not need to be moved
+      // again. This runs in O(n) time.
+
+      // Always choose a random pivot so that an input array which is reverse
+      // sorted does not cause O(n^2) running time.
+      var pivotIndex = randomIntInRange(p, r);
+      var i = p - 1;
+
+      swap(ary, pivotIndex, r);
+      var pivot = ary[r];
+
+      // Immediately after `j` is incremented in this loop, the following hold
+      // true:
+      //
+      //   * Every element in `ary[p .. i]` is less than or equal to the pivot.
+      //
+      //   * Every element in `ary[i+1 .. j-1]` is greater than the pivot.
+      for (var j = p; j < r; j++) {
+        if (comparator(ary[j], pivot) <= 0) {
+          i += 1;
+          swap(ary, i, j);
+        }
+      }
+
+      swap(ary, i + 1, j);
+      var q = i + 1;
+
+      // (2) Recurse on each half.
+
+      doQuickSort(ary, comparator, p, q - 1);
+      doQuickSort(ary, comparator, q + 1, r);
+    }
+  }
+
+  /**
+   * Sort the given array in-place with the given comparator function.
+   *
+   * @param {Array} ary
+   *        An array to sort.
+   * @param {function} comparator
+   *        Function to use to compare two items.
+   */
+  exports.quickSort = function (ary, comparator) {
+    doQuickSort(ary, comparator, 0, ary.length - 1);
+  };
+
+});
+/* -*- Mode: js; js-indent-level: 2; -*- */
+/*
+ * Copyright 2011 Mozilla Foundation and contributors
+ * Licensed under the New BSD license. See LICENSE or:
+ * http://opensource.org/licenses/BSD-3-Clause
+ */
 define('source-map/source-node', ['require', 'exports', 'module' ,  'source-map/source-map-generator', 'source-map/util'], function(require, exports, module) {
 
   var SourceMapGenerator = require('./source-map-generator').SourceMapGenerator;
   var util = require('./util');
 
   // Matches a Windows-style `\r\n` newline or a `\n` newline used by all other
   // operating systems these days (capturing the result).
   var REGEX_NEWLINE = /(\r?\n)/;
@@ -2738,8 +3032,11 @@ define('source-map/source-node', ['requi
 /* -*- Mode: js; js-indent-level: 2; -*- */
 ///////////////////////////////////////////////////////////////////////////////
 
 this.sourceMap = {
   SourceMapConsumer: require('source-map/source-map-consumer').SourceMapConsumer,
   SourceMapGenerator: require('source-map/source-map-generator').SourceMapGenerator,
   SourceNode: require('source-map/source-node').SourceNode
 };
+if (typeof module === "object" && module && module.exports) {
+  module.exports = this.sourceMap;
+}
--- a/toolkit/devtools/sourcemap/tests/unit/Utils.jsm
+++ b/toolkit/devtools/sourcemap/tests/unit/Utils.jsm
@@ -7,27 +7,28 @@
 
 /*
  * WARNING!
  *
  * Do not edit this file directly, it is built from the sources at
  * https://github.com/mozilla/source-map/
  */
 
-Components.utils.import('resource://gre/modules/devtools/Require.jsm');
-Components.utils.import('resource://gre/modules/devtools/SourceMap.jsm');
+let loader = Components.classes["@mozilla.org/moz/jssubscript-loader;1"]
+  .getService(Components.interfaces.mozIJSSubScriptLoader);
+loader.loadSubScript("resource://gre/modules/devtools/sourcemap/source-map.js", this);
 
 this.EXPORTED_SYMBOLS = [ "define", "runSourceMapTests" ];
 /* -*- Mode: js; js-indent-level: 2; -*- */
 /*
  * Copyright 2011 Mozilla Foundation and contributors
  * Licensed under the New BSD license. See LICENSE or:
  * http://opensource.org/licenses/BSD-3-Clause
  */
-define('test/source-map/assert', ['exports'], function (exports) {
+define('test/source-map/assert', ['require', 'exports'], function (require, exports) {
 
   let do_throw = function (msg) {
     throw new Error(msg);
   };
 
   exports.init = function (throw_fn) {
     do_throw = throw_fn;
   };
--- a/toolkit/devtools/sourcemap/tests/unit/test_api.js
+++ b/toolkit/devtools/sourcemap/tests/unit/test_api.js
@@ -13,18 +13,18 @@ Components.utils.import('resource://test
  * http://opensource.org/licenses/BSD-3-Clause
  */
 define("test/source-map/test-api", ["require", "exports", "module"], function (require, exports, module) {
 
   var sourceMap;
   try {
     sourceMap = require('source-map');
   } catch (e) {
-    sourceMap = {};
-    Components.utils.import('resource:///modules/devtools/SourceMap.jsm', sourceMap);
+    var loader = Components.utils.import("resource://gre/modules/devtools/Loader.jsm", {});
+    sourceMap = loader.devtools.require("devtools/toolkit/sourcemap/source-map");
   }
 
   exports['test that the api is properly exposed in the top level'] = function (assert, util) {
     assert.equal(typeof sourceMap.SourceMapGenerator, "function");
     assert.equal(typeof sourceMap.SourceMapConsumer, "function");
     assert.equal(typeof sourceMap.SourceNode, "function");
   };