Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeLookupswitch.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 2001-2003 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 BytecodeLookupswitch extends Bytecode { | |
31 BytecodeLookupswitch(Method method, int bci) { | |
32 super(method, bci); | |
33 } | |
34 | |
35 // Attributes | |
36 public int defaultOffset() { return javaSignedWordAt(alignedOffset(1 + 0*jintSize)); } | |
37 public int numberOfPairs() { return javaSignedWordAt(alignedOffset(1 + 1*jintSize)); } | |
38 public LookupswitchPair pairAt(int i) { | |
39 if (Assert.ASSERTS_ENABLED) { | |
40 Assert.that(0 <= i && i < numberOfPairs(), "pair index out of bounds"); | |
41 } | |
42 return new LookupswitchPair(method, bci + alignedOffset(1 + (1 + i)*2*jintSize)); | |
43 } | |
44 | |
45 public void verify() { | |
46 if (Assert.ASSERTS_ENABLED) { | |
47 Assert.that(isValid(), "check lookupswitch"); | |
48 } | |
49 } | |
50 | |
51 public boolean isValid() { | |
52 boolean result = javaCode() == Bytecodes._lookupswitch; | |
53 if (result == false) return false; | |
54 int i = numberOfPairs() - 1; | |
55 while (i-- > 0) { | |
56 if(pairAt(i).match() > pairAt(i+1).match()) | |
57 return false; // unsorted lookup table | |
58 } | |
59 return true; | |
60 } | |
61 | |
62 public static BytecodeLookupswitch at(Method method, int bci) { | |
63 BytecodeLookupswitch b = new BytecodeLookupswitch(method, bci); | |
64 if (Assert.ASSERTS_ENABLED) { | |
65 b.verify(); | |
66 } | |
67 return b; | |
68 } | |
69 | |
70 /** Like at, but returns null if the BCI is not at lookupswitch */ | |
71 public static BytecodeLookupswitch atCheck(Method method, int bci) { | |
72 BytecodeLookupswitch b = new BytecodeLookupswitch(method, bci); | |
73 return (b.isValid() ? b : null); | |
74 } | |
75 | |
76 public static BytecodeLookupswitch at(BytecodeStream bcs) { | |
77 return new BytecodeLookupswitch(bcs.method(), bcs.bci()); | |
78 } | |
79 | |
80 public String toString() { | |
81 StringBuffer buf = new StringBuffer(); | |
82 buf.append("lookupswitch"); | |
83 buf.append(spaces); | |
84 buf.append("default: "); | |
85 buf.append(Integer.toString(bci() + defaultOffset())); | |
86 buf.append(comma); | |
87 int i = numberOfPairs() - 1; | |
88 while (i-- > 0) { | |
89 LookupswitchPair pair = pairAt(i); | |
90 buf.append("case "); | |
91 buf.append(Integer.toString(pair.match())); | |
92 buf.append(':'); | |
93 buf.append(Integer.toString(bci() + pair.offset())); | |
94 buf.append(comma); | |
95 } | |
96 | |
97 return buf.toString(); | |
98 } | |
99 } |