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comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/Bytecode.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 2001-2004 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.interpreter;
26
27 import sun.jvm.hotspot.oops.*;
28 import sun.jvm.hotspot.utilities.*;
29
30 public class Bytecode {
31 Method method;
32 int bci;
33 static final int jintSize = 4;
34 static final String spaces = " ";
35 static final String comma = ", ";
36
37 Bytecode(Method method, int bci) {
38 this.method = method;
39 this.bci = bci;
40 }
41
42 // Address computation
43 // NOTE: assumes that the start of the method's bytecodes is 4-byte aligned
44 int alignedOffset(int offset) {
45 return Bits.roundTo(bci + offset, jintSize) - bci;
46 }
47
48 int javaSignedWordAt(int offset) {
49 return method.getBytecodeIntArg(bci + offset);
50 }
51
52 short javaShortAt(int offset) {
53 return method.getBytecodeShortArg(bci + offset);
54 }
55
56 byte javaByteAt(int offset) {
57 return method.getBytecodeByteArg(bci + offset);
58 }
59
60 public Method method() { return method; }
61 public int bci() { return bci; }
62
63 // hotspot byte code
64 public int code() {
65 return Bytecodes.codeAt(method(), bci());
66 }
67
68 // jvm byte code
69 public int javaCode() {
70 return Bytecodes.javaCode(code());
71 }
72
73 public String getBytecodeName() {
74 return Bytecodes.name(code());
75 }
76
77 public String getJavaBytecodeName() {
78 return Bytecodes.name(javaCode());
79 }
80
81 public int getLength() {
82 return Bytecodes.lengthAt(method(), bci());
83 }
84
85 public int getJavaLength() {
86 return Bytecodes.javaLengthAt(method(), bci());
87 }
88
89 public String toString() {
90 StringBuffer buf = new StringBuffer(getJavaBytecodeName());
91 if (code() != javaCode()) {
92 buf.append(spaces);
93 buf.append('[');
94 buf.append(getBytecodeName());
95 buf.append(']');
96 }
97 return buf.toString();
98 }
99 }