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annotate agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeLookupswitch.java @ 2042:0a8e0d4345b3 hs20-b05 jdk7-b124
7010068: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - first pass
Summary: Update the copyright to be 2010 on all changed files in OpenJDK
Reviewed-by: jcoomes
| author | trims |
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| date | Mon, 03 Jan 2011 15:30:05 -0800 |
| parents | c18cbe5936b8 |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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 } |