duke@435: /*
duke@435:  * Copyright 1997-2005 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // An NmethodSweeper is an incremental cleaner for:
duke@435: //    - cleanup inline caches
duke@435: //    - reclamation of unreferences zombie nmethods
duke@435: //
duke@435: 
duke@435: class NMethodSweeper : public AllStatic {
duke@435:   static long      _traversals;   // Stack traversal count
duke@435:   static CodeBlob* _current;      // Current nmethod
duke@435:   static int       _seen;         // Nof. nmethod we have currently processed in current pass of CodeCache
duke@435:   static int       _invocations;  // No. of invocations left until we are completed with this pass
duke@435: 
duke@435:   static bool      _rescan;          // Indicates that we should do a full rescan of the
duke@435:                                      // of the code cache looking for work to do.
duke@435:   static int       _locked_seen;     // Number of locked nmethods encountered during the scan
duke@435:   static int       _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
duke@435: 
duke@435: 
duke@435:   static void process_nmethod(nmethod *nm);
duke@435:  public:
duke@435:   static long traversal_count() { return _traversals; }
duke@435: 
duke@435:   static void sweep();  // Invoked at the end of each safepoint
duke@435: 
duke@435:   static void notify(nmethod* nm) {
duke@435:     // Perform a full scan of the code cache from the beginning.  No
duke@435:     // need to synchronize the setting of this flag since it only
duke@435:     // changes to false at safepoint so we can never overwrite it with false.
duke@435:      _rescan = true;
duke@435:   }
duke@435: };