Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeTableswitch.java @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children |
| rev | line source |
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| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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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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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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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 BytecodeTableswitch extends Bytecode { | |
| 31 BytecodeTableswitch(Method method, int bci) { | |
| 32 super(method, bci); | |
| 33 } | |
| 34 | |
| 35 | |
| 36 // Attributes | |
| 37 public int defaultOffset() { return javaSignedWordAt(alignedOffset(1 + 0*jintSize)); } | |
| 38 public int lowKey() { return javaSignedWordAt(alignedOffset(1 + 1*jintSize)); } | |
| 39 public int highKey() { return javaSignedWordAt(alignedOffset(1 + 2*jintSize)); } | |
| 40 public int length() { return highKey()-lowKey()+1; } | |
| 41 public int destOffsetAt(int i) { | |
| 42 int x2 = alignedOffset(1 + (3 + i)*jintSize); | |
| 43 int val = javaSignedWordAt(x2); | |
| 44 return javaSignedWordAt(alignedOffset(1 + (3 + i)*jintSize)); | |
| 45 } | |
| 46 | |
| 47 public void verify() { | |
| 48 if (Assert.ASSERTS_ENABLED) { | |
| 49 Assert.that(isValid(), "check tableswitch"); | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 public boolean isValid() { | |
| 54 boolean result = javaCode() == Bytecodes._tableswitch; | |
| 55 if (result == false) return false; | |
| 56 int lo = lowKey(); | |
| 57 int hi = highKey(); | |
| 58 if (hi < lo) // incorrect hi/lo values in tableswitch | |
| 59 return false; | |
| 60 | |
| 61 int i = hi - lo - 1 ; | |
| 62 while (i-- > 0) { | |
| 63 // no special check needed | |
| 64 } | |
| 65 return true; | |
| 66 } | |
| 67 | |
| 68 public static BytecodeTableswitch at(Method method, int bci) { | |
| 69 BytecodeTableswitch b = new BytecodeTableswitch(method, bci); | |
| 70 if (Assert.ASSERTS_ENABLED) { | |
| 71 b.verify(); | |
| 72 } | |
| 73 return b; | |
| 74 } | |
| 75 | |
| 76 /** Like at, but returns null if the BCI is not at tableswitch */ | |
| 77 public static BytecodeTableswitch atCheck(Method method, int bci) { | |
| 78 BytecodeTableswitch b = new BytecodeTableswitch(method, bci); | |
| 79 return (b.isValid() ? b : null); | |
| 80 } | |
| 81 | |
| 82 public static BytecodeTableswitch at(BytecodeStream bcs) { | |
| 83 return new BytecodeTableswitch(bcs.method(), bcs.bci()); | |
| 84 } | |
| 85 | |
| 86 public String toString() { | |
| 87 StringBuffer buf = new StringBuffer(); | |
| 88 buf.append("tableswitch"); | |
| 89 buf.append(spaces); | |
| 90 buf.append("default: "); | |
| 91 buf.append(Integer.toString(bci() + defaultOffset())); | |
| 92 buf.append(comma); | |
| 93 int lo = lowKey(); | |
| 94 int hi = highKey(); | |
| 95 int i = hi - lo - 1 ; | |
| 96 while (i-- > 0) { | |
| 97 buf.append("case "); | |
| 98 buf.append(Integer.toString(lo + i)); | |
| 99 buf.append(':'); | |
| 100 buf.append(Integer.toString(bci() + destOffsetAt(i))); | |
| 101 buf.append(comma); | |
| 102 } | |
| 103 return buf.toString(); | |
| 104 } | |
| 105 } |