The Tor Browser / file comparison
comparison: addon-sdk/source/lib/sdk/deprecated/memory.js
addon-sdk/source/lib/sdk/deprecated/memory.js
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:38874172c4ed |
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 "use strict"; | |
| 5 | |
| 6 module.metadata = { | |
| 7 "stability": "deprecated" | |
| 8 }; | |
| 9 | |
| 10 const { Cc, Ci, Cu, components } = require("chrome"); | |
| 11 const { when: unload } = require("../system/unload") | |
| 12 | |
| 13 var trackedObjects = {}; | |
| 14 const Compacter = { | |
| 15 notify: function() { | |
| 16 var newTrackedObjects = {}; | |
| 17 | |
| 18 for (let name in trackedObjects) { | |
| 19 let oldBin = trackedObjects[name]; | |
| 20 let newBin = []; | |
| 21 let strongRefs = []; | |
| 22 | |
| 23 for (let i = 0, l = oldBin.length; i < l; i++) { | |
| 24 let strongRef = oldBin[i].weakref.get(); | |
| 25 | |
| 26 if (strongRef && strongRefs.indexOf(strongRef) == -1) { | |
| 27 strongRefs.push(strongRef); | |
| 28 newBin.push(oldBin[i]); | |
| 29 } | |
| 30 } | |
| 31 | |
| 32 if (newBin.length) | |
| 33 newTrackedObjects[name] = newBin; | |
| 34 } | |
| 35 | |
| 36 trackedObjects = newTrackedObjects; | |
| 37 } | |
| 38 }; | |
| 39 | |
| 40 var timer = Cc["@mozilla.org/timer;1"] | |
| 41 .createInstance(Ci.nsITimer); | |
| 42 timer.initWithCallback(Compacter, | |
| 43 5000, | |
| 44 Ci.nsITimer.TYPE_REPEATING_SLACK); | |
| 45 | |
| 46 function track(object, bin, stackFrameNumber) { | |
| 47 var frame = components.stack.caller; | |
| 48 var weakref = Cu.getWeakReference(object); | |
| 49 | |
| 50 if (!bin && 'constructor' in object) | |
| 51 bin = object.constructor.name; | |
| 52 if (bin == "Object") | |
| 53 bin = frame.name; | |
| 54 if (!bin) | |
| 55 bin = "generic"; | |
| 56 if (!(bin in trackedObjects)) | |
| 57 trackedObjects[bin] = []; | |
| 58 | |
| 59 if (stackFrameNumber > 0) | |
| 60 for (var i = 0; i < stackFrameNumber; i++) | |
| 61 frame = frame.caller; | |
| 62 | |
| 63 trackedObjects[bin].push({weakref: weakref, | |
| 64 created: new Date(), | |
| 65 filename: frame.filename, | |
| 66 lineNo: frame.lineNumber, | |
| 67 bin: bin}); | |
| 68 } | |
| 69 exports.track = track; | |
| 70 | |
| 71 var getBins = exports.getBins = function getBins() { | |
| 72 var names = []; | |
| 73 for (let name in trackedObjects) | |
| 74 names.push(name); | |
| 75 return names; | |
| 76 }; | |
| 77 | |
| 78 function getObjects(bin) { | |
| 79 var results = []; | |
| 80 | |
| 81 function getLiveObjectsInBin(bin) { | |
| 82 for (let i = 0, l = bin.length; i < l; i++) { | |
| 83 let object = bin[i].weakref.get(); | |
| 84 | |
| 85 if (object) { | |
| 86 results.push(bin[i]); | |
| 87 } | |
| 88 } | |
| 89 } | |
| 90 | |
| 91 if (bin) { | |
| 92 if (bin in trackedObjects) | |
| 93 getLiveObjectsInBin(trackedObjects[bin]); | |
| 94 } | |
| 95 else { | |
| 96 for (let name in trackedObjects) | |
| 97 getLiveObjectsInBin(trackedObjects[name]); | |
| 98 } | |
| 99 | |
| 100 return results; | |
| 101 } | |
| 102 exports.getObjects = getObjects; | |
| 103 | |
| 104 function gc() { | |
| 105 // Components.utils.forceGC() doesn't currently perform | |
| 106 // cycle collection, which means that e.g. DOM elements | |
| 107 // won't be collected by it. Fortunately, there are | |
| 108 // other ways... | |
| 109 var test_utils = Cc["@mozilla.org/appshell/appShellService;1"] | |
| 110 .getService(Ci.nsIAppShellService) | |
| 111 .hiddenDOMWindow | |
| 112 .QueryInterface(Ci.nsIInterfaceRequestor) | |
| 113 .getInterface(Ci.nsIDOMWindowUtils); | |
| 114 test_utils.garbageCollect(); | |
| 115 // Clean metadata for dead objects | |
| 116 Compacter.notify(); | |
| 117 // Not sure why, but sometimes it appears that we don't get | |
| 118 // them all with just one CC, so let's do it again. | |
| 119 test_utils.garbageCollect(); | |
| 120 }; | |
| 121 exports.gc = gc; | |
| 122 | |
| 123 unload(_ => { | |
| 124 trackedObjects = {}; | |
| 125 if (timer) { | |
| 126 timer.cancel(); | |
| 127 timer = null; | |
| 128 } | |
| 129 }); |
