1 /* 2 * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // This is a shared helper class used during phase 3 and 4 to move all the objects 26 // Dead regions in a Space are linked together to keep track of the live regions 27 // so that the live data can be traversed quickly without having to look at each 28 // object. 29 30 class LiveRange: public MemRegion { 31 public: 32 LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {} 33 34 void set_end(HeapWord* e) { 35 assert(e >= start(), "should be a non-zero range"); 36 MemRegion::set_end(e); 37 } 38 void set_word_size(size_t ws) { 39 assert(ws >= 0, "should be a non-zero range"); 40 MemRegion::set_word_size(ws); 41 } 42 43 LiveRange * next() { return (LiveRange *) end(); } 44 45 void move_to(HeapWord* destination) { 46 Copy::aligned_conjoint_words(start(), destination, word_size()); 47 } 48 };