1 /* 2 * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.runtime.win32_x86; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.debugger.win32.*; 31 import sun.jvm.hotspot.debugger.x86.*; 32 import sun.jvm.hotspot.runtime.*; 33 import sun.jvm.hotspot.runtime.x86.*; 34 import sun.jvm.hotspot.types.*; 35 import sun.jvm.hotspot.utilities.*; 36 37 /** This class is only public to allow using the VMObjectFactory to 38 instantiate these. 39 */ 40 41 public class Win32X86JavaThreadPDAccess implements JavaThreadPDAccess { 42 private static AddressField lastJavaFPField; 43 private static AddressField osThreadField; 44 45 // Field from OSThread 46 private static Field osThreadThreadHandleField; 47 48 // This is currently unneeded but is being kept in case we change 49 // the currentFrameGuess algorithm 50 private static final long GUESS_SCAN_RANGE = 128 * 1024; 51 52 static { 53 VM.registerVMInitializedObserver(new Observer() { 54 public void update(Observable o, Object data) { 55 initialize(VM.getVM().getTypeDataBase()); 56 } 57 }); 58 } 59 60 private static synchronized void initialize(TypeDataBase db) { 61 Type type = db.lookupType("JavaThread"); 62 Type anchorType = db.lookupType("JavaFrameAnchor"); 63 lastJavaFPField = anchorType.getAddressField("_last_Java_fp"); 64 osThreadField = type.getAddressField("_osthread"); 65 66 type = db.lookupType("OSThread"); 67 osThreadThreadHandleField = type.getField("_thread_handle"); 68 } 69 70 public Address getLastJavaFP(Address addr) { 71 return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset())); 72 } 73 74 public Address getLastJavaPC(Address addr) { 75 return null; 76 } 77 78 public Address getBaseOfStackPointer(Address addr) { 79 return null; 80 } 81 82 public Frame getLastFramePD(JavaThread thread, Address addr) { 83 Address fp = thread.getLastJavaFP(); 84 if (fp == null) { 85 return null; // no information 86 } 87 Address pc = thread.getLastJavaPC(); 88 if ( pc != null ) { 89 return new X86Frame(thread.getLastJavaSP(), fp, pc); 90 } else { 91 return new X86Frame(thread.getLastJavaSP(), fp); 92 } 93 } 94 95 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) { 96 return new X86RegisterMap(thread, updateMap); 97 } 98 99 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) { 100 ThreadProxy t = getThreadProxy(addr); 101 X86ThreadContext context = (X86ThreadContext) t.getContext(); 102 X86CurrentFrameGuess guesser = new X86CurrentFrameGuess(context, thread); 103 if (!guesser.run(GUESS_SCAN_RANGE)) { 104 return null; 105 } 106 if (guesser.getPC() == null) { 107 return new X86Frame(guesser.getSP(), guesser.getFP()); 108 } else { 109 return new X86Frame(guesser.getSP(), guesser.getFP(), guesser.getPC()); 110 } 111 } 112 113 public void printThreadIDOn(Address addr, PrintStream tty) { 114 tty.print(getThreadProxy(addr)); 115 } 116 117 public void printInfoOn(Address threadAddr, PrintStream tty) { 118 } 119 120 public Address getLastSP(Address addr) { 121 ThreadProxy t = getThreadProxy(addr); 122 X86ThreadContext context = (X86ThreadContext) t.getContext(); 123 return context.getRegisterAsAddress(X86ThreadContext.ESP); 124 } 125 126 public ThreadProxy getThreadProxy(Address addr) { 127 // Addr is the address of the JavaThread. 128 // Fetch the OSThread (for now and for simplicity, not making a 129 // separate "OSThread" class in this package) 130 Address osThreadAddr = osThreadField.getValue(addr); 131 // Get the address of the HANDLE within the OSThread 132 Address threadHandleAddr = 133 osThreadAddr.addOffsetTo(osThreadThreadHandleField.getOffset()); 134 JVMDebugger debugger = VM.getVM().getDebugger(); 135 return debugger.getThreadForIdentifierAddress(threadHandleAddr); 136 } 137 }