1 /* 2 * Copyright (c) 2001, 2015, 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 #ifndef SHARE_VM_GC_SHARED_LIVERANGE_HPP 26 #define SHARE_VM_GC_SHARED_LIVERANGE_HPP 27 28 #include "memory/memRegion.hpp" 29 #include "utilities/copy.hpp" 30 31 // This is a shared helper class used during phase 3 and 4 to move all the objects 32 // Dead regions in a Space are linked together to keep track of the live regions 33 // so that the live data can be traversed quickly without having to look at each 34 // object. 35 36 class LiveRange: public MemRegion { 37 public: 38 LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {} 39 40 void set_end(HeapWord* e) { 41 assert(e >= start(), "should be a non-zero range"); 42 MemRegion::set_end(e); 43 } 44 void set_word_size(size_t ws) { 45 MemRegion::set_word_size(ws); 46 } 47 48 LiveRange * next() { return (LiveRange *) end(); } 49 50 void move_to(HeapWord* destination) { 51 Copy::aligned_conjoint_words(start(), destination, word_size()); 52 } 53 }; 54 55 #endif // SHARE_VM_GC_SHARED_LIVERANGE_HPP