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comparison agent/src/share/classes/sun/jvm/hotspot/oops/CompressedLineNumberReadStream.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 2001-2005 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.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 }