gecko/xpcom/base/nsCycleCollector.h
2010-09-21 14:58:19 +02:00

104 lines
4.1 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* 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 ***** */
#ifndef nsCycleCollector_h__
#define nsCycleCollector_h__
// NOTE: If you use header files to define DEBUG_CC, you must do so here
// *and* in nsCycleCollectionParticipant.h
//#define DEBUG_CC
class nsISupports;
class nsICycleCollectorListener;
class nsCycleCollectionParticipant;
class nsCycleCollectionTraversalCallback;
// An nsCycleCollectionLanguageRuntime is a per-language object that
// implements language-specific aspects of the cycle collection task.
struct nsCycleCollectionLanguageRuntime
{
virtual nsresult BeginCycleCollection(nsCycleCollectionTraversalCallback &cb,
bool explainLiveExpectedGarbage) = 0;
virtual nsresult FinishCycleCollection() = 0;
virtual nsCycleCollectionParticipant *ToParticipant(void *p) = 0;
#ifdef DEBUG_CC
virtual void PrintAllReferencesTo(void *p) = 0;
#endif
};
nsresult nsCycleCollector_startup();
// Returns the number of collected nodes.
NS_COM PRUint32 nsCycleCollector_collect(nsICycleCollectorListener *aListener);
NS_COM PRUint32 nsCycleCollector_suspectedCount();
void nsCycleCollector_shutdown();
// The JS runtime is special, it needs to call cycle collection during its GC.
// If the JS runtime is registered nsCycleCollector_collect will call
// nsCycleCollectionJSRuntime::Collect which will call
// nsCycleCollector_doCollect, else nsCycleCollector_collect will call
// nsCycleCollector_doCollect directly.
struct nsCycleCollectionJSRuntime : public nsCycleCollectionLanguageRuntime
{
/**
* Runs the JavaScript GC.
*/
virtual void Collect() = 0;
};
#ifdef DEBUG
NS_COM void nsCycleCollector_DEBUG_shouldBeFreed(nsISupports *n);
NS_COM void nsCycleCollector_DEBUG_wasFreed(nsISupports *n);
#endif
// Helpers for interacting with language-identified scripts
NS_COM void nsCycleCollector_registerRuntime(PRUint32 langID, nsCycleCollectionLanguageRuntime *rt);
NS_COM nsCycleCollectionLanguageRuntime * nsCycleCollector_getRuntime(PRUint32 langID);
NS_COM void nsCycleCollector_forgetRuntime(PRUint32 langID);
#define NS_CYCLE_COLLECTOR_LOGGER_CID \
{ 0x58be81b4, 0x39d2, 0x437c, \
{ 0x94, 0xea, 0xae, 0xde, 0x2c, 0x62, 0x08, 0xd3 } }
extern nsresult
nsCycleCollectorLoggerConstructor(nsISupports* outer,
const nsIID& aIID,
void* *aInstancePtr);
#endif // nsCycleCollector_h__