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1 /*
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2 * Copyright 2000-2003 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.win32_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.win32.*;
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31 import sun.jvm.hotspot.debugger.x86.*;
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32 import sun.jvm.hotspot.runtime.*;
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33 import sun.jvm.hotspot.runtime.x86.*;
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34 import sun.jvm.hotspot.types.*;
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35 import sun.jvm.hotspot.utilities.*;
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36
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37 /** This class is only public to allow using the VMObjectFactory to
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38 instantiate these.
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39 */
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40
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41 public class Win32X86JavaThreadPDAccess implements JavaThreadPDAccess {
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42 private static AddressField lastJavaFPField;
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43 private static AddressField osThreadField;
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44
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45 // Field from OSThread
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46 private static Field osThreadThreadHandleField;
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47
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48 // This is currently unneeded but is being kept in case we change
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49 // the currentFrameGuess algorithm
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50 private static final long GUESS_SCAN_RANGE = 128 * 1024;
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51
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52 static {
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53 VM.registerVMInitializedObserver(new Observer() {
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54 public void update(Observable o, Object data) {
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55 initialize(VM.getVM().getTypeDataBase());
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56 }
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57 });
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58 }
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59
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60 private static synchronized void initialize(TypeDataBase db) {
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61 Type type = db.lookupType("JavaThread");
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62 Type anchorType = db.lookupType("JavaFrameAnchor");
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63 lastJavaFPField = anchorType.getAddressField("_last_Java_fp");
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64 osThreadField = type.getAddressField("_osthread");
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65
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66 type = db.lookupType("OSThread");
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67 osThreadThreadHandleField = type.getField("_thread_handle");
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68 }
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69
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70 public Address getLastJavaFP(Address addr) {
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71 return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset()));
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72 }
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73
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74 public Address getLastJavaPC(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 Address getBaseOfStackPointer(Address addr) {
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79 return null;
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80 }
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81
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82 public Frame getLastFramePD(JavaThread thread, Address addr) {
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83 Address fp = thread.getLastJavaFP();
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84 if (fp == null) {
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85 return null; // no information
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86 }
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87 Address pc = thread.getLastJavaPC();
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88 if ( pc != null ) {
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89 return new X86Frame(thread.getLastJavaSP(), fp, pc);
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90 } else {
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91 return new X86Frame(thread.getLastJavaSP(), fp);
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92 }
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93 }
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94
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95 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) {
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96 return new X86RegisterMap(thread, updateMap);
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97 }
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98
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99 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) {
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100 ThreadProxy t = getThreadProxy(addr);
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101 X86ThreadContext context = (X86ThreadContext) t.getContext();
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102 X86CurrentFrameGuess guesser = new X86CurrentFrameGuess(context, thread);
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103 if (!guesser.run(GUESS_SCAN_RANGE)) {
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104 return null;
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105 }
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106 if (guesser.getPC() == null) {
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107 return new X86Frame(guesser.getSP(), guesser.getFP());
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108 } else {
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109 return new X86Frame(guesser.getSP(), guesser.getFP(), guesser.getPC());
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110 }
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111 }
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112
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113 public void printThreadIDOn(Address addr, PrintStream tty) {
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114 tty.print(getThreadProxy(addr));
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115 }
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116
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117 public void printInfoOn(Address threadAddr, PrintStream tty) {
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118 }
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119
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120 public Address getLastSP(Address addr) {
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121 ThreadProxy t = getThreadProxy(addr);
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122 X86ThreadContext context = (X86ThreadContext) t.getContext();
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123 return context.getRegisterAsAddress(X86ThreadContext.ESP);
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124 }
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125
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126 public ThreadProxy getThreadProxy(Address addr) {
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127 // Addr is the address of the JavaThread.
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128 // Fetch the OSThread (for now and for simplicity, not making a
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129 // separate "OSThread" class in this package)
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130 Address osThreadAddr = osThreadField.getValue(addr);
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131 // Get the address of the HANDLE within the OSThread
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132 Address threadHandleAddr =
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133 osThreadAddr.addOffsetTo(osThreadThreadHandleField.getOffset());
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134 JVMDebugger debugger = VM.getVM().getDebugger();
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135 return debugger.getThreadForIdentifierAddress(threadHandleAddr);
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136 }
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137 }
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