Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/runtime/StackFrameStream.java @ 12226:7944aba7ba41
8015107: NPG: Use consistent naming for metaspace concepts
Reviewed-by: coleenp, mgerdin, hseigel
| author | ehelin |
|---|---|
| date | Mon, 12 Aug 2013 17:37:02 +0200 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2000, 2004, 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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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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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.runtime; | |
| 26 | |
| 27 import sun.jvm.hotspot.utilities.*; | |
| 28 | |
| 29 /** <P> StackFrameStream iterates through the frames of a thread | |
| 30 starting from top most frame. It automatically takes care of | |
| 31 updating the location of all (callee-saved) registers. Notice: If | |
| 32 a thread is stopped at a safepoint, all registers are saved, not | |
| 33 only the callee-saved ones. </P> | |
| 34 | |
| 35 <P> Use: </P> | |
| 36 | |
| 37 <PRE> | |
| 38 for(StackFrameStream fst = new StackFrameStream(thread); !fst.isDone(); fst.next()) { | |
| 39 ... | |
| 40 } | |
| 41 </PRE> | |
| 42 */ | |
| 43 | |
| 44 public class StackFrameStream { | |
| 45 private Frame fr; | |
| 46 private RegisterMap regMap; | |
| 47 private boolean isDone; | |
| 48 | |
| 49 /** Equivalent to StackFrameStream(thread, true) */ | |
| 50 public StackFrameStream(JavaThread thread) { | |
| 51 this(thread, true); | |
| 52 } | |
| 53 | |
| 54 public StackFrameStream(JavaThread thread, boolean update) { | |
| 55 if (!VM.getVM().isDebugging()) { | |
| 56 if (Assert.ASSERTS_ENABLED) { | |
| 57 Assert.that(thread.hasLastJavaFrame(), "sanity check"); | |
| 58 } | |
| 59 fr = thread.getLastFrame(); | |
| 60 regMap = thread.newRegisterMap(update); | |
| 61 isDone = false; | |
| 62 } else { | |
| 63 // Special case code to find the topmost Java frame | |
| 64 // FIXME: should check to see whether we're at safepoint, and if | |
| 65 // so, skip the "current frame guess" call and unnecessary | |
| 66 // stackwalking work | |
| 67 fr = thread.getCurrentFrameGuess(); | |
| 68 regMap = thread.newRegisterMap(update); | |
| 69 while ((fr != null) && (!fr.isJavaFrame())) { | |
| 70 if (fr.isFirstFrame()) { | |
| 71 fr = null; | |
| 72 } else { | |
| 73 fr = fr.sender(regMap); | |
| 74 } | |
| 75 } | |
| 76 if (fr == null) { | |
| 77 isDone = true; | |
| 78 } | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 /** Iteration */ | |
| 83 public boolean isDone() { | |
| 84 if (isDone) { | |
| 85 return true; | |
| 86 } else { | |
| 87 if (fr == null) { | |
| 88 isDone = true; | |
| 89 return true; | |
| 90 } | |
| 91 isDone = fr.isFirstFrame(); | |
| 92 return false; | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 public void next() { | |
| 97 if (!isDone) { | |
| 98 fr = fr.sender(regMap); | |
| 99 } | |
| 100 } | |
| 101 | |
| 102 /** Query */ | |
| 103 public Frame getCurrent() { return fr; } | |
| 104 public RegisterMap getRegisterMap() { return regMap; } | |
| 105 } |