/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* ***** 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 nsCycleCollectionParticipant_h__ #define nsCycleCollectionParticipant_h__ #include "nsISupports.h" #define NS_CYCLECOLLECTIONPARTICIPANT_IID \ { /* 407bbd61-13b2-4f85-bdc6-23a59d881f80 */ \ 0x407bbd61, \ 0x13b2, \ 0x4f85, \ { 0xbd, 0xc6, 0x23, 0xa5, 0x9d, 0x88, 0x1f, 0x80 } \ } #undef IMETHOD_VISIBILITY #define IMETHOD_VISIBILITY NS_VISIBILITY_DEFAULT struct nsCycleCollectionTraversalCallback { // You must call DescribeNode() with an accurate refcount, // otherwise cycle collection will fail, and probably crash. // Providing an accurate objsz or objname is optional. virtual void DescribeNode(size_t refcount, size_t objsz, const char *objname) = 0; virtual void NoteScriptChild(PRUint32 langID, void *child) = 0; virtual void NoteXPCOMChild(nsISupports *child) = 0; }; class NS_COM nsCycleCollectionParticipant : public nsISupports { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_CYCLECOLLECTIONPARTICIPANT_IID) NS_DECL_ISUPPORTS NS_IMETHOD Unlink(nsISupports *p); NS_IMETHOD Traverse(nsISupports *p, nsCycleCollectionTraversalCallback &cb); }; NS_DEFINE_STATIC_IID_ACCESSOR(nsCycleCollectionParticipant, NS_CYCLECOLLECTIONPARTICIPANT_IID) #undef IMETHOD_VISIBILITY #define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing a QI to nsCycleCollectionParticipant /////////////////////////////////////////////////////////////////////////////// #define NS_CYCLE_COLLECTION_INNERCLASS \ cycleCollection #define NS_CYCLE_COLLECTION_CLASSNAME(_class) \ _class::NS_CYCLE_COLLECTION_INNERCLASS #define NS_CYCLE_COLLECTION_NAME(_class) \ _class##_cycleCollectorGlobal #define NS_IMPL_QUERY_CYCLE_COLLECTION(_class) \ if ( aIID.Equals(NS_GET_IID(nsCycleCollectionParticipant)) ) { \ foundInterface = & NS_CYCLE_COLLECTION_NAME(_class); \ } else #define NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION(_class) \ NS_IMPL_QUERY_CYCLE_COLLECTION(_class) /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing nsCycleCollectionParticipant::Unlink /////////////////////////////////////////////////////////////////////////////// #define NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class, _base) \ NS_IMETHODIMP \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::Unlink(nsISupports *s) \ { \ NS_ASSERTION(nsCOMPtr(do_QueryInterface(s)) == s, \ "not canonical nsISupports pointer"); \ _class *tmp = NS_STATIC_CAST(_class*, NS_STATIC_CAST(_base*, s)); #define NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(_field) \ tmp->_field = NULL; #define NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMARRAY(_field) \ tmp->_field.Clear(); #define NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ return NS_OK; \ } /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing nsCycleCollectionParticipant::Traverse /////////////////////////////////////////////////////////////////////////////// #define NS_IMPL_CYCLE_COLLECTION_DESCRIBE(_class) \ cb.DescribeNode(tmp->mRefCnt.get(), sizeof(_class), #_class); #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class, _base) \ NS_IMETHODIMP \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::Traverse \ (nsISupports *s, \ nsCycleCollectionTraversalCallback &cb) \ { \ NS_ASSERTION(nsCOMPtr(do_QueryInterface(s)) == s, \ "not canonical nsISupports pointer"); \ _class *tmp = NS_STATIC_CAST(_class*, NS_STATIC_CAST(_base*, s)); \ NS_IMPL_CYCLE_COLLECTION_DESCRIBE(_class) #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(_field) \ if (tmp->_field) { cb.NoteXPCOMChild(tmp->_field.get()); } #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMARRAY(_field) \ { \ PRInt32 i; \ for (i = 0; i < tmp->_field.Count(); ++i) \ if (tmp->_field[i]) \ cb.NoteXPCOMChild(tmp->_field[i]); \ } #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END \ return NS_OK; \ } /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing a concrete nsCycleCollectionParticipant /////////////////////////////////////////////////////////////////////////////// #define NS_DECL_CYCLE_COLLECTION_CLASS(_class) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public nsCycleCollectionParticipant \ { \ NS_IMETHOD Unlink(nsISupports *n); \ NS_IMETHOD Traverse(nsISupports *n, \ nsCycleCollectionTraversalCallback &cb); \ }; #define NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ static NS_CYCLE_COLLECTION_CLASSNAME(_class) \ NS_CYCLE_COLLECTION_NAME(_class); // The *_AMBIGUOUS macros are needed when a cast from _class* to // nsISupports* is ambiguous. The _base parameter must match the base // class used to implement QueryInterface to nsISupports. #define NS_IMPL_CYCLE_COLLECTION_0_AMBIGUOUS(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END #define NS_IMPL_CYCLE_COLLECTION_1_AMBIGUOUS(_class, _base, _f) \ NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(_f) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(_f) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END #define NS_IMPL_CYCLE_COLLECTION_2_AMBIGUOUS(_class, _base, _f1, _f2) \ NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(_f1) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(_f2) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(_f1) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(_f2) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END #define NS_IMPL_CYCLE_COLLECTION_3_AMBIGUOUS(_class, _base, _f1, _f2, _f3) \ NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(_f1) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(_f2) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(_f3) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(_f1) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(_f2) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(_f3) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END #define NS_IMPL_CYCLE_COLLECTION_0(_class) \ NS_IMPL_CYCLE_COLLECTION_0_AMBIGUOUS(_class, _class) #define NS_IMPL_CYCLE_COLLECTION_1(_class, _f) \ NS_IMPL_CYCLE_COLLECTION_1_AMBIGUOUS(_class, _class, _f) #define NS_IMPL_CYCLE_COLLECTION_2(_class, _f1, _f2) \ NS_IMPL_CYCLE_COLLECTION_2_AMBIGUOUS(_class, _class, _f1, _f2) #define NS_IMPL_CYCLE_COLLECTION_3(_class, _f1, _f2, _f3) \ NS_IMPL_CYCLE_COLLECTION_3_AMBIGUOUS(_class, _class, _f1, _f2, _f3) #endif // nsCycleCollectionParticipant_h__