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/* 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/. */
"use strict";
module.metadata = {
"stability": "deprecated"
};
const {Cc,Ci,Cu,components} = require("chrome");
var trackedObjects = {};
var Compacter = {
INTERVAL: 5000,
notify: function(timer) {
var newTrackedObjects = {};
for (let name in trackedObjects) {
var oldBin = trackedObjects[name];
var newBin = [];
var strongRefs = [];
for (var i = 0; i < oldBin.length; i++) {
var strongRef = oldBin[i].weakref.get();
if (strongRef && strongRefs.indexOf(strongRef) == -1) {
strongRefs.push(strongRef);
newBin.push(oldBin[i]);
}
}
if (newBin.length)
newTrackedObjects[name] = newBin;
}
trackedObjects = newTrackedObjects;
}
};
var timer = Cc["@mozilla.org/timer;1"]
.createInstance(Ci.nsITimer);
timer.initWithCallback(Compacter,
Compacter.INTERVAL,
Ci.nsITimer.TYPE_REPEATING_SLACK);
var track = exports.track = function track(object, bin, stackFrameNumber) {
var frame = components.stack.caller;
var weakref = Cu.getWeakReference(object);
if (!bin && 'constructor' in object)
bin = object.constructor.name;
if (bin == "Object")
bin = frame.name;
if (!bin)
bin = "generic";
if (!(bin in trackedObjects))
trackedObjects[bin] = [];
if (stackFrameNumber > 0)
for (var i = 0; i < stackFrameNumber; i++)
frame = frame.caller;
trackedObjects[bin].push({weakref: weakref,
created: new Date(),
filename: frame.filename,
lineNo: frame.lineNumber,
bin: bin});
};
var getBins = exports.getBins = function getBins() {
var names = [];
for (let name in trackedObjects)
names.push(name);
return names;
};
var getObjects = exports.getObjects = function getObjects(bin) {
function getLiveObjectsInBin(bin, array) {
for (var i = 0; i < bin.length; i++) {
var object = bin[i].weakref.get();
if (object)
array.push(bin[i]);
}
}
var results = [];
if (bin) {
if (bin in trackedObjects)
getLiveObjectsInBin(trackedObjects[bin], results);
} else
for (let name in trackedObjects)
getLiveObjectsInBin(trackedObjects[name], results);
return results;
};
var gc = exports.gc = function gc() {
// Components.utils.forceGC() doesn't currently perform
// cycle collection, which means that e.g. DOM elements
// won't be collected by it. Fortunately, there are
// other ways...
var window = Cc["@mozilla.org/appshell/appShellService;1"]
.getService(Ci.nsIAppShellService)
.hiddenDOMWindow;
var test_utils = window.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils);
test_utils.garbageCollect();
Compacter.notify();
// Not sure why, but sometimes it appears that we don't get
// them all with just one CC, so let's do it again.
test_utils.garbageCollect();
};
require("../system/unload").when(
function() {
trackedObjects = {};
if (timer) {
timer.cancel();
timer = null;
}
});
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