Mercurial > hg > graal-compiler

comparison agent/src/share/classes/sun/jvm/hotspot/compiler/OopMapStream.java @ 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 2000 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 package sun.jvm.hotspot.compiler;
26
27 import sun.jvm.hotspot.code.*;
28
29 public class OopMapStream {
30 private CompressedReadStream stream;
31 private OopMap oopMap;
32 private int mask;
33 private int size;
34 private int position;
35 private OopMapValue omv;
36 private boolean omvValid;
37
38 public OopMapStream(OopMap oopMap) {
39 this(oopMap, (OopMapValue.OopTypes[]) null);
40 }
41
42 public OopMapStream(OopMap oopMap, OopMapValue.OopTypes type) {
43 this(oopMap, (OopMapValue.OopTypes[]) null);
44 mask = type.getValue();
45 }
46
47 public OopMapStream(OopMap oopMap, OopMapValue.OopTypes[] types) {
48 if (oopMap.getOMVData() == null) {
49 stream = new CompressedReadStream(oopMap.getWriteStream().getBuffer());
50 } else {
51 stream = new CompressedReadStream(oopMap.getOMVData());
52 }
53 mask = computeMask(types);
54 size = (int) oopMap.getOMVCount();
55 position = 0;
56 omv = new OopMapValue();
57 omvValid = false;
58 }
59
60 public boolean isDone() {
61 if (!omvValid) {
62 findNext();
63 }
64 return !omvValid;
65 }
66
67 public void next() {
68 findNext();
69 }
70
71 public OopMapValue getCurrent() {
72 return omv;
73 }
74
75 //--------------------------------------------------------------------------------
76 // Internals only below this point
77 //
78
79 private int computeMask(OopMapValue.OopTypes[] types) {
80 mask = 0;
81 if (types != null) {
82 for (int i = 0; i < types.length; i++) {
83 mask |= types[i].getValue();
84 }
85 }
86 return mask;
87 }
88
89 private void findNext() {
90 while (position++ < size) {
91 omv.readFrom(stream);
92 if ((omv.getType().getValue() & mask) > 0) {
93 omvValid = true;
94 return;
95 }
96 }
97 omvValid = false;
98 }
99 }