duke@435: /*
duke@435:  * Copyright 2001-2003 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: // This is a shared helper class used during phase 3 and 4 to move all the objects
duke@435: // Dead regions in a Space are linked together to keep track of the live regions
duke@435: // so that the live data can be traversed quickly without having to look at each
duke@435: // object.
duke@435: 
duke@435: class LiveRange: public MemRegion {
duke@435: public:
duke@435:   LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {}
duke@435: 
duke@435:   void set_end(HeapWord* e) {
duke@435:     assert(e >= start(), "should be a non-zero range");
duke@435:     MemRegion::set_end(e);
duke@435:   }
duke@435:   void set_word_size(size_t ws) {
duke@435:     assert(ws >= 0, "should be a non-zero range");
duke@435:     MemRegion::set_word_size(ws);
duke@435:   }
duke@435: 
duke@435:   LiveRange * next() { return (LiveRange *) end(); }
duke@435: 
duke@435:   void move_to(HeapWord* destination) {
duke@435:     Copy::aligned_conjoint_words(start(), destination, word_size());
duke@435:   }
duke@435: };