Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/utilities/LivenessPath.java @ 17467:55fb97c4c58d hs25-b65
8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
Summary: Copyright year updated for files modified during 2013
Reviewed-by: twisti, iveresov
| author | mikael |
|---|---|
| date | Tue, 24 Dec 2013 11:48:39 -0800 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2006, 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.utilities; | |
| 26 | |
| 27 import java.io.*; | |
| 28 import java.util.*; | |
| 29 import sun.jvm.hotspot.oops.*; | |
| 30 | |
| 31 /** Describes a path from an object back to the root which is keeping | |
| 32 it alive. Elements of the path are (object, field) pairs, where | |
| 33 the object is expressed as a @link{sun.jvm.hotspot.oops.Oop}, and | |
| 34 where the field is expressed as a | |
| 35 @link{sun.jvm.hotspot.oops.FieldIdentifier}. If the element | |
| 36 reflects a root, the Oop will be null. If the element is the end | |
| 37 of the path, the FieldIdentifier will be null. */ | |
| 38 | |
| 39 public class LivenessPath { | |
| 40 LivenessPath() { | |
| 41 stack = new Stack(); | |
| 42 } | |
| 43 | |
| 44 /** Number of elements in the path */ | |
| 45 public int size() { | |
| 46 return stack.size(); | |
| 47 } | |
| 48 | |
| 49 /** Fetch the element at the given index; 0-based */ | |
| 50 public LivenessPathElement get(int index) throws ArrayIndexOutOfBoundsException { | |
| 51 return (LivenessPathElement) stack.get(index); | |
| 52 } | |
| 53 | |
| 54 public void printOn(PrintStream tty) { | |
| 55 for (int j = 0; j < size(); j++) { | |
| 56 LivenessPathElement el = get(j); | |
| 57 tty.print(" - "); | |
| 58 if (el.getObj() != null) { | |
| 59 Oop.printOopValueOn(el.getObj(), tty); | |
| 60 } | |
| 61 if (el.getField() != null) { | |
| 62 if (el.getObj() != null) { | |
| 63 tty.print(", field "); | |
| 64 } | |
| 65 tty.print(el.getField().getName()); | |
| 66 } | |
| 67 tty.println(); | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 /** Indicates whether this path is "complete", i.e., whether the | |
| 72 last element is a root. Convenience routine for LivenessAnalysis. */ | |
| 73 boolean isComplete() { | |
| 74 if (size() == 0) | |
| 75 return false; | |
| 76 return peek().isRoot(); | |
| 77 } | |
| 78 | |
| 79 // Convenience routine for LivenessAnalysis | |
| 80 LivenessPathElement peek() { | |
| 81 return (LivenessPathElement) stack.peek(); | |
| 82 } | |
| 83 | |
| 84 // Convenience routine for LivenessAnalysis | |
| 85 void push(LivenessPathElement el) { | |
| 86 stack.push(el); | |
| 87 } | |
| 88 | |
| 89 // Convenience routine for LivenessAnalysis | |
| 90 void pop() { | |
| 91 stack.pop(); | |
| 92 } | |
| 93 | |
| 94 // Make a copy of the contents of the path -- the | |
| 95 // LivenessPathElements are not duplicated, only the containing path | |
| 96 LivenessPath copy() { | |
| 97 LivenessPath dup = new LivenessPath(); | |
| 98 for (int i = 0; i < stack.size(); i++) { | |
| 99 dup.stack.push(stack.get(i)); | |
| 100 } | |
| 101 return dup; | |
| 102 } | |
| 103 | |
| 104 //--------------------------------------------------------------------------- | |
| 105 // Internals only below this point | |
| 106 // | |
| 107 private Stack stack; | |
| 108 } |