/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is XPCOM cycle collector.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

/** Interface to pass to the cycle collector to get information about
 * the CC graph while it's being built. The order of calls will be a
 * call to begin(); then for every node in the graph a call to either
 * noteRefCountedObject() or noteGCedObject(), followed by calls to
 * noteEdge() for every edge starting at that node; then a call to
 * beginResults(); then a mixture of describeRoot() for ref counted
 * nodes the CC has identified as roots and describeGarbage() for
 * nodes the CC has identified as garbage.  Ref counted nodes that are
 * not identified as either roots or garbage are neither, and have a
 * known edges count equal to their ref count.  Finally, there will be
 * a call to end().  If begin() returns an error none of the other
 * functions will be called.
 */
[scriptable, builtinclass, uuid(e7e9a010-d02f-4137-94c8-6d73605fe623)]
interface nsICycleCollectorListener : nsISupports
{
    nsICycleCollectorListener allTraces();
    // false if allTraces() has not been called.
    readonly attribute boolean wantAllTraces;

    void begin();
    void noteRefCountedObject (in unsigned long long aAddress,
			       in unsigned long aRefCount,
			       in string aObjectDescription);
    void noteGCedObject (in unsigned long long aAddress,
			 in boolean aMarked,
			 in string aObjectDescription);
    void noteEdge(in unsigned long long aToAddress,
                  in string aEdgeName);
    void beginResults();
    void describeRoot(in unsigned long long aAddress,
		      in unsigned long aKnownEdges);
    void describeGarbage(in unsigned long long aAddress);
    void end();
};
