0
|
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 }
|