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1 /* ***** BEGIN LICENSE BLOCK *****
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2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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3 *
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4 * The contents of this file are subject to the Mozilla Public License Version
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5 * 1.1 (the "License"); you may not use this file except in compliance with
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6 * the License. You may obtain a copy of the License at
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7 * http://www.mozilla.org/MPL/
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8 *
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9 * Software distributed under the License is distributed on an "AS IS" basis,
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10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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11 * for the specific language governing rights and limitations under the
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12 * License.
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13 *
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14 * The Original Code is Pseudo Weak References for Web Content.
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15 *
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16 * The Initial Developer of the Original Code is Mozilla.
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17 * Portions created by the Initial Developer are Copyright (C) 2007
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18 * the Initial Developer. All Rights Reserved.
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19 *
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20 * Contributor(s):
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21 * Atul Varma <atul@mozilla.com>
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22 *
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23 * Alternatively, the contents of this file may be used under the terms of
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24 * either the GNU General Public License Version 2 or later (the "GPL"), or
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25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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26 * in which case the provisions of the GPL or the LGPL are applicable instead
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27 * of those above. If you wish to allow use of your version of this file only
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28 * under the terms of either the GPL or the LGPL, and not to allow others to
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29 * use your version of this file under the terms of the MPL, indicate your
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30 * decision by deleting the provisions above and replace them with the notice
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31 * and other provisions required by the GPL or the LGPL. If you do not delete
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32 * the provisions above, a recipient may use your version of this file under
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33 * the terms of any one of the MPL, the GPL or the LGPL.
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34 *
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35 * ***** END LICENSE BLOCK ***** */
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36
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37 // This Ubiquity page-load function injects the following functions for memory
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38 // debugging into webpages:
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39 //
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40 // * window.PseudoWeakRef(object) makes a pseudo-weak reference for the
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41 // object. It has one method, exists(), which returns whether or not
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42 // the referent still exists (i.e., has not been garbage collected).
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43 //
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44 // * window.forceGC() forces garbage collection.
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45
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46 function pageLoad_injectPseudoWeakRefs(document) {
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47 var sandbox = Components.utils.Sandbox(document.defaultView);
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48 var weakrefs = [];
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49
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50 function makePseudoWeakRef(object) {
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51 var weakref = new Components.utils.getWeakReference(object);
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52 object = null;
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53 weakrefs.push(weakref);
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54 return weakrefs.length - 1;
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55 }
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56
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57 function isReferentAlive(id) {
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58 if (typeof(id) == "number" && weakrefs[id]) {
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59 if (weakrefs[id].get() != null)
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60 return true;
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61 else
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62 delete weakrefs[id];
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63 }
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64 return false;
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65 }
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66
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67 function forceGC() {
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68 Components.utils.forceGC();
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69 }
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70
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71 sandbox.importFunction(makePseudoWeakRef);
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72 sandbox.importFunction(isReferentAlive);
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73 sandbox.importFunction(forceGC);
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74
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75 function PseudoWeakRef(object) {
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76 var id = makePseudoWeakRef(object);
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77 object = null;
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78 this.exists = function() {
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79 return isReferentAlive(id);
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80 };
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81 }
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82
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83 Components.utils.evalInSandbox(PseudoWeakRef.toString(), sandbox);
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84
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85 sandbox.window = document.defaultView.wrappedJSObject;
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86 Components.utils.evalInSandbox(
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87 ("window.PseudoWeakRef = PseudoWeakRef;" +
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88 "window.forceGC = forceGC;"),
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89 sandbox
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90 );
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91 }
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