The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/addon-sdk/source/lib/sdk/deprecated/memory.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,129 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +"use strict";
     1.8 +
     1.9 +module.metadata = {
    1.10 +  "stability": "deprecated"
    1.11 +};
    1.12 +
    1.13 +const { Cc, Ci, Cu, components } = require("chrome");
    1.14 +const { when: unload } = require("../system/unload")
    1.15 +
    1.16 +var trackedObjects = {};
    1.17 +const Compacter = {
    1.18 +  notify: function() {
    1.19 +    var newTrackedObjects = {};
    1.20 +
    1.21 +    for (let name in trackedObjects) {
    1.22 +      let oldBin = trackedObjects[name];
    1.23 +      let newBin = [];
    1.24 +      let strongRefs = [];
    1.25 +
    1.26 +      for (let i = 0, l = oldBin.length; i < l; i++) {
    1.27 +        let strongRef = oldBin[i].weakref.get();
    1.28 +
    1.29 +        if (strongRef && strongRefs.indexOf(strongRef) == -1) {
    1.30 +          strongRefs.push(strongRef);
    1.31 +          newBin.push(oldBin[i]);
    1.32 +        }
    1.33 +      }
    1.34 +
    1.35 +      if (newBin.length)
    1.36 +        newTrackedObjects[name] = newBin;
    1.37 +    }
    1.38 +
    1.39 +    trackedObjects = newTrackedObjects;
    1.40 +  }
    1.41 +};
    1.42 +
    1.43 +var timer = Cc["@mozilla.org/timer;1"]
    1.44 +            .createInstance(Ci.nsITimer);
    1.45 +timer.initWithCallback(Compacter,
    1.46 +                       5000,
    1.47 +                       Ci.nsITimer.TYPE_REPEATING_SLACK);
    1.48 +
    1.49 +function track(object, bin, stackFrameNumber) {
    1.50 +  var frame = components.stack.caller;
    1.51 +  var weakref = Cu.getWeakReference(object);
    1.52 +
    1.53 +  if (!bin && 'constructor' in object)
    1.54 +    bin = object.constructor.name;
    1.55 +  if (bin == "Object")
    1.56 +    bin = frame.name;
    1.57 +  if (!bin)
    1.58 +    bin = "generic";
    1.59 +  if (!(bin in trackedObjects))
    1.60 +    trackedObjects[bin] = [];
    1.61 +
    1.62 +  if (stackFrameNumber > 0)
    1.63 +    for (var i = 0; i < stackFrameNumber; i++)
    1.64 +      frame = frame.caller;
    1.65 +
    1.66 +  trackedObjects[bin].push({weakref: weakref,
    1.67 +                            created: new Date(),
    1.68 +                            filename: frame.filename,
    1.69 +                            lineNo: frame.lineNumber,
    1.70 +                            bin: bin});
    1.71 +}
    1.72 +exports.track = track;
    1.73 +
    1.74 +var getBins = exports.getBins = function getBins() {
    1.75 +  var names = [];
    1.76 +  for (let name in trackedObjects)
    1.77 +    names.push(name);
    1.78 +  return names;
    1.79 +};
    1.80 +
    1.81 +function getObjects(bin) {
    1.82 +  var results = [];
    1.83 +
    1.84 +  function getLiveObjectsInBin(bin) {
    1.85 +    for (let i = 0, l = bin.length; i < l; i++) {
    1.86 +      let object = bin[i].weakref.get();
    1.87 +
    1.88 +      if (object) {
    1.89 +        results.push(bin[i]);
    1.90 +      }
    1.91 +    }
    1.92 +  }
    1.93 +
    1.94 +  if (bin) {
    1.95 +    if (bin in trackedObjects)
    1.96 +      getLiveObjectsInBin(trackedObjects[bin]);
    1.97 +  }
    1.98 +  else {
    1.99 +    for (let name in trackedObjects)
   1.100 +      getLiveObjectsInBin(trackedObjects[name]);
   1.101 +  }
   1.102 +
   1.103 +  return results;
   1.104 +}
   1.105 +exports.getObjects = getObjects;
   1.106 +
   1.107 +function gc() {
   1.108 +  // Components.utils.forceGC() doesn't currently perform
   1.109 +  // cycle collection, which means that e.g. DOM elements
   1.110 +  // won't be collected by it. Fortunately, there are
   1.111 +  // other ways...
   1.112 +  var test_utils = Cc["@mozilla.org/appshell/appShellService;1"]
   1.113 +               .getService(Ci.nsIAppShellService)
   1.114 +               .hiddenDOMWindow
   1.115 +               .QueryInterface(Ci.nsIInterfaceRequestor)
   1.116 +               .getInterface(Ci.nsIDOMWindowUtils);
   1.117 +  test_utils.garbageCollect();
   1.118 +  // Clean metadata for dead objects
   1.119 +  Compacter.notify();
   1.120 +  // Not sure why, but sometimes it appears that we don't get
   1.121 +  // them all with just one CC, so let's do it again.
   1.122 +  test_utils.garbageCollect();
   1.123 +};
   1.124 +exports.gc = gc;
   1.125 +
   1.126 +unload(_ => {
   1.127 +  trackedObjects = {};
   1.128 +  if (timer) {
   1.129 +    timer.cancel();
   1.130 +    timer = null;
   1.131 +  }
   1.132 +});