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comparison src/share/vm/gc_implementation/shared/liveRange.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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 };