01: /*
02: * ProGuard -- shrinking, optimization, obfuscation, and preverification
03: * of Java bytecode.
04: *
05: * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
06: *
07: * This library is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU General Public License as published by the Free
09: * Software Foundation; either version 2 of the License, or (at your option)
10: * any later version.
11: *
12: * This library is distributed in the hope that it will be useful, but WITHOUT
13: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
15: * for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public License
18: * along with this library; if not, write to the Free Software Foundation,
19: * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20: */
21: package proguard.classfile.attribute;
22:
23: import proguard.classfile.*;
24: import proguard.classfile.attribute.visitor.*;
25:
26: /**
27: * This Attribute represents a line number table attribute.
28: *
29: * @author Eric Lafortune
30: */
31: public class LineNumberTableAttribute extends Attribute {
32: public int u2lineNumberTableLength;
33: public LineNumberInfo[] lineNumberTable;
34:
35: /**
36: * Creates an uninitialized LineNumberTableAttribute.
37: */
38: public LineNumberTableAttribute() {
39: }
40:
41: /**
42: * Returns the line number corresponding to the given byte code program
43: * counter.
44: */
45: public int getLineNumber(int pc) {
46: for (int index = u2lineNumberTableLength - 1; index >= 0; index--) {
47: LineNumberInfo info = lineNumberTable[index];
48: if (pc >= info.u2startPC) {
49: return info.u2lineNumber;
50: }
51: }
52:
53: return u2lineNumberTableLength > 0 ? lineNumberTable[0].u2lineNumber
54: : 0;
55: }
56:
57: // Implementations for Attribute.
58:
59: public void accept(Clazz clazz, Method method,
60: CodeAttribute codeAttribute,
61: AttributeVisitor attributeVisitor) {
62: attributeVisitor.visitLineNumberTableAttribute(clazz, method,
63: codeAttribute, this );
64: }
65:
66: /**
67: * Applies the given visitor to all line numbers.
68: */
69: public void lineNumbersAccept(Clazz clazz, Method method,
70: CodeAttribute codeAttribute,
71: LineNumberInfoVisitor lineNumberInfoVisitor) {
72: for (int index = 0; index < u2lineNumberTableLength; index++) {
73: // We don't need double dispatching here, since there is only one
74: // type of LineNumberInfo.
75: lineNumberInfoVisitor.visitLineNumberInfo(clazz, method,
76: codeAttribute, lineNumberTable[index]);
77: }
78: }
79: }
|