1 /*
   2  * Copyright (c) 2005, 2013, 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_amd64;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.debugger.amd64.*;
  31 import sun.jvm.hotspot.runtime.*;
  32 import sun.jvm.hotspot.runtime.amd64.*;
  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 Win32AMD64JavaThreadPDAccess implements JavaThreadPDAccess {
  42   private static AddressField  lastJavaFPField;
  43   private static AddressField  osThreadField;
  44 
  45   // Field from OSThread
  46   private static Field         osThreadThreadIdField;
  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     osThreadThreadIdField = type.getField("_thread_id");
  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     AMD64ThreadContext context = (AMD64ThreadContext) t.getContext();
 102     AMD64CurrentFrameGuess guesser = new AMD64CurrentFrameGuess(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     AMD64ThreadContext context = (AMD64ThreadContext) t.getContext();
 123     return context.getRegisterAsAddress(AMD64ThreadContext.RSP);
 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 thread_id within the OSThread
 132     Address threadIdAddr =
 133       osThreadAddr.addOffsetTo(osThreadThreadIdField.getOffset());
 134     JVMDebugger debugger = VM.getVM().getDebugger();
 135     return debugger.getThreadForIdentifierAddress(threadIdAddr);
 136   }
 137 }