Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/Bytecode.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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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 } |