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3960
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1 /*
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2 * Copyright (c) 2002, 2003, Oracle and/or its affiliates. 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 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.
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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.bsd_x86;
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26
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27 import java.io.*;
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28 import java.util.*;
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.debugger.x86.*;
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31 import sun.jvm.hotspot.runtime.*;
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32 import sun.jvm.hotspot.runtime.x86.*;
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33 import sun.jvm.hotspot.types.*;
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34 import sun.jvm.hotspot.utilities.*;
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35
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36 public class BsdX86JavaThreadPDAccess implements JavaThreadPDAccess {
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37 private static AddressField lastJavaFPField;
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38 private static AddressField osThreadField;
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39
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40 // Field from OSThread
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41 private static CIntegerField osThreadThreadIDField;
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42
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43 // This is currently unneeded but is being kept in case we change
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44 // the currentFrameGuess algorithm
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45 private static final long GUESS_SCAN_RANGE = 128 * 1024;
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46
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47 static {
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48 VM.registerVMInitializedObserver(new Observer() {
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49 public void update(Observable o, Object data) {
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50 initialize(VM.getVM().getTypeDataBase());
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51 }
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52 });
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53 }
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54
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55 private static synchronized void initialize(TypeDataBase db) {
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56 Type type = db.lookupType("JavaThread");
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57 osThreadField = type.getAddressField("_osthread");
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58
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59 Type anchorType = db.lookupType("JavaFrameAnchor");
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60 lastJavaFPField = anchorType.getAddressField("_last_Java_fp");
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61
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62 Type osThreadType = db.lookupType("OSThread");
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63 osThreadThreadIDField = osThreadType.getCIntegerField("_thread_id");
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64 }
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65
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66 public Address getLastJavaFP(Address addr) {
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67 return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset()));
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68 }
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69
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70 public Address getLastJavaPC(Address addr) {
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71 return null;
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72 }
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73
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74 public Address getBaseOfStackPointer(Address addr) {
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75 return null;
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76 }
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77
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78 public Frame getLastFramePD(JavaThread thread, Address addr) {
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79 Address fp = thread.getLastJavaFP();
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80 if (fp == null) {
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81 return null; // no information
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82 }
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83 return new X86Frame(thread.getLastJavaSP(), fp);
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84 }
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85
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86 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) {
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87 return new X86RegisterMap(thread, updateMap);
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88 }
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89
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90 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) {
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91 ThreadProxy t = getThreadProxy(addr);
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92 X86ThreadContext context = (X86ThreadContext) t.getContext();
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93 X86CurrentFrameGuess guesser = new X86CurrentFrameGuess(context, thread);
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94 if (!guesser.run(GUESS_SCAN_RANGE)) {
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95 return null;
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96 }
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97 if (guesser.getPC() == null) {
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98 return new X86Frame(guesser.getSP(), guesser.getFP());
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99 } else {
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100 return new X86Frame(guesser.getSP(), guesser.getFP(), guesser.getPC());
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101 }
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102 }
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103
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104 public void printThreadIDOn(Address addr, PrintStream tty) {
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105 tty.print(getThreadProxy(addr));
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106 }
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107
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108 public void printInfoOn(Address threadAddr, PrintStream tty) {
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109 tty.print("Thread id: ");
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110 printThreadIDOn(threadAddr, tty);
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111 // tty.println("\nPostJavaState: " + getPostJavaState(threadAddr));
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112 }
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113
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114 public Address getLastSP(Address addr) {
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115 ThreadProxy t = getThreadProxy(addr);
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116 X86ThreadContext context = (X86ThreadContext) t.getContext();
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117 return context.getRegisterAsAddress(X86ThreadContext.ESP);
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118 }
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119
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120 public ThreadProxy getThreadProxy(Address addr) {
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121 // Addr is the address of the JavaThread.
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122 // Fetch the OSThread (for now and for simplicity, not making a
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123 // separate "OSThread" class in this package)
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124 Address osThreadAddr = osThreadField.getValue(addr);
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125 // Get the address of the _thread_id from the OSThread
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126 Address threadIdAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset());
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127
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128 JVMDebugger debugger = VM.getVM().getDebugger();
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129 return debugger.getThreadForIdentifierAddress(threadIdAddr);
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130 }
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131 }
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