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1 /*
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2 * Copyright 2000-2004 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.runtime;
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26
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27 import sun.jvm.hotspot.utilities.*;
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28
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29 /** <P> StackFrameStream iterates through the frames of a thread
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30 starting from top most frame. It automatically takes care of
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31 updating the location of all (callee-saved) registers. Notice: If
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32 a thread is stopped at a safepoint, all registers are saved, not
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33 only the callee-saved ones. </P>
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34
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35 <P> Use: </P>
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36
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37 <PRE>
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38 for(StackFrameStream fst = new StackFrameStream(thread); !fst.isDone(); fst.next()) {
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39 ...
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40 }
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41 </PRE>
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42 */
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43
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44 public class StackFrameStream {
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45 private Frame fr;
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46 private RegisterMap regMap;
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47 private boolean isDone;
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48
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49 /** Equivalent to StackFrameStream(thread, true) */
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50 public StackFrameStream(JavaThread thread) {
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51 this(thread, true);
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52 }
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53
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54 public StackFrameStream(JavaThread thread, boolean update) {
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55 if (!VM.getVM().isDebugging()) {
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56 if (Assert.ASSERTS_ENABLED) {
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57 Assert.that(thread.hasLastJavaFrame(), "sanity check");
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58 }
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59 fr = thread.getLastFrame();
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60 regMap = thread.newRegisterMap(update);
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61 isDone = false;
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62 } else {
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63 // Special case code to find the topmost Java frame
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64 // FIXME: should check to see whether we're at safepoint, and if
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65 // so, skip the "current frame guess" call and unnecessary
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66 // stackwalking work
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67 fr = thread.getCurrentFrameGuess();
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68 regMap = thread.newRegisterMap(update);
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69 while ((fr != null) && (!fr.isJavaFrame())) {
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70 if (fr.isFirstFrame()) {
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71 fr = null;
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72 } else {
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73 fr = fr.sender(regMap);
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74 }
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75 }
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76 if (fr == null) {
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77 isDone = true;
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78 }
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79 }
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80 }
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81
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82 /** Iteration */
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83 public boolean isDone() {
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84 if (isDone) {
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85 return true;
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86 } else {
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87 if (fr == null) {
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88 isDone = true;
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89 return true;
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90 }
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91 isDone = fr.isFirstFrame();
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92 return false;
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93 }
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94 }
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95
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96 public void next() {
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97 if (!isDone) {
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98 fr = fr.sender(regMap);
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99 }
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100 }
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101
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102 /** Query */
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103 public Frame getCurrent() { return fr; }
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104 public RegisterMap getRegisterMap() { return regMap; }
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105 }
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