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