Mercurial > hg > graal-jvmci-8
annotate agent/src/share/classes/sun/jvm/hotspot/oops/CompressedLineNumberReadStream.java @ 8059:49618582fc5b
8004840: Jstack seems to output unnecessary information in 7u9
Reviewed-by: dholmes, coleenp, sspitsyn, rbackman
author | sla |
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date | Thu, 14 Feb 2013 13:08:15 +0100 |
parents | c18cbe5936b8 |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2001, 2005, 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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6941466: Oracle rebranding changes for Hotspot repositories
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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 |
c18cbe5936b8
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.oops; | |
26 | |
27 import sun.jvm.hotspot.code.*; | |
28 import sun.jvm.hotspot.debugger.*; | |
29 | |
30 public class CompressedLineNumberReadStream extends CompressedReadStream { | |
31 /** Equivalent to CompressedLineNumberReadStream(buffer, 0) */ | |
32 public CompressedLineNumberReadStream(Address buffer) { | |
33 this(buffer, 0); | |
34 } | |
35 | |
36 public CompressedLineNumberReadStream(Address buffer, int position) { | |
37 super(buffer, position); | |
38 } | |
39 | |
40 /** Read (bci, line number) pair from stream. Returns false at end-of-stream. */ | |
41 public boolean readPair() { | |
42 int next = readByte() & 0xFF; | |
43 // Check for terminator | |
44 if (next == 0) return false; | |
45 if (next == 0xFF) { | |
46 // Escape character, regular compression used | |
47 bci += readSignedInt(); | |
48 line += readSignedInt(); | |
49 } else { | |
50 // Single byte compression used | |
51 bci += next >> 3; | |
52 line += next & 0x7; | |
53 } | |
54 return true; | |
55 } | |
56 | |
57 public int bci() { return bci; } | |
58 public int line() { return line; } | |
59 | |
60 //-------------------------------------------------------------------------------- | |
61 // Internals only below this point | |
62 // | |
63 | |
64 private int bci; | |
65 private int line; | |
66 } |