Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/utilities/MarkBits.java @ 2426:1d1603768966
7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass
Summary: Update the copyright to be 2010 on all changed files in OpenJDK
Reviewed-by: ohair
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date | Tue, 05 Apr 2011 14:12:31 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.utilities; | |
26 | |
27 import sun.jvm.hotspot.debugger.*; | |
28 import sun.jvm.hotspot.gc_interface.*; | |
29 import sun.jvm.hotspot.memory.*; | |
30 import sun.jvm.hotspot.oops.*; | |
31 import sun.jvm.hotspot.runtime.*; | |
32 | |
33 /** Helper class which covers the reserved area of the heap with an | |
34 (object-external) set of mark bits, used for GC-like scans through | |
35 the heap like liveness analysis. */ | |
36 | |
37 public class MarkBits { | |
38 public MarkBits(CollectedHeap heap) { | |
39 MemRegion reserved = heap.reservedRegion(); | |
40 // Must cover "reserved" with one bit for each OopHandle | |
41 start = reserved.start(); | |
42 end = reserved.end(); | |
43 long numOopHandles = end.minus(start) / VM.getVM().getOopSize(); | |
44 // FIXME: will have trouble with larger heap sizes | |
45 bits = new BitMap((int) numOopHandles); | |
46 } | |
47 | |
48 public void clear() { | |
49 bits.clear(); | |
50 } | |
51 | |
52 /** Returns true if a mark was newly placed for the given Oop, or | |
53 false if the Oop was already marked. If the Oop happens to lie | |
54 outside the heap (should not happen), prints a warning and | |
55 returns false. */ | |
56 public boolean mark(Oop obj) { | |
57 if (obj == null) { | |
58 System.err.println("MarkBits: WARNING: null object, ignoring"); | |
59 return false; | |
60 } | |
61 | |
62 OopHandle handle = obj.getHandle(); | |
63 // FIXME: will have trouble with larger heap sizes | |
64 long idx = handle.minus(start) / VM.getVM().getOopSize(); | |
65 if ((idx < 0) || (idx >= bits.size())) { | |
66 System.err.println("MarkBits: WARNING: object " + handle + " outside of heap, ignoring"); | |
67 return false; | |
68 } | |
69 int intIdx = (int) idx; | |
70 if (bits.at(intIdx)) { | |
71 return false; // already marked | |
72 } | |
73 bits.atPut(intIdx, true); | |
74 return true; | |
75 } | |
76 | |
77 /** Forces clearing of a given mark bit. */ | |
78 public void clear(Oop obj) { | |
79 OopHandle handle = obj.getHandle(); | |
80 // FIXME: will have trouble with larger heap sizes | |
81 long idx = handle.minus(start) / VM.getVM().getOopSize(); | |
82 if ((idx < 0) || (idx >= bits.size())) { | |
83 System.err.println("MarkBits: WARNING: object " + handle + " outside of heap, ignoring"); | |
84 return; | |
85 } | |
86 int intIdx = (int) idx; | |
87 bits.atPut(intIdx, false); | |
88 } | |
89 | |
90 private BitMap bits; | |
91 private Address start; | |
92 private Address end; | |
93 } |