1 /*
   2  * Copyright 2000-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.code;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.runtime.*;
  31 import sun.jvm.hotspot.types.*;
  32 
  33 /** PcDescs map a physical PC (given as offset from start of nmethod)
  34     to the corresponding source scope and byte code index. */
  35 
  36 public class PCDesc extends VMObject {
  37   private static CIntegerField pcOffsetField;
  38   private static CIntegerField scopeDecodeOffsetField;
  39 
  40   static {
  41     VM.registerVMInitializedObserver(new Observer() {
  42         public void update(Observable o, Object data) {
  43           initialize(VM.getVM().getTypeDataBase());
  44         }
  45       });
  46   }
  47 
  48   private static void initialize(TypeDataBase db) {
  49     Type type = db.lookupType("PcDesc");
  50 
  51     pcOffsetField          = type.getCIntegerField("_pc_offset");
  52     scopeDecodeOffsetField = type.getCIntegerField("_scope_decode_offset");
  53   }
  54 
  55   public PCDesc(Address addr) {
  56     super(addr);
  57   }
  58 
  59   // FIXME: add additional constructor probably needed for ScopeDesc::sender()
  60 
  61   public int getPCOffset() {
  62     return (int) pcOffsetField.getValue(addr);
  63   }
  64 
  65   public int getScopeDecodeOffset() {
  66     return ((int) scopeDecodeOffsetField.getValue(addr));
  67   }
  68 
  69   public Address getRealPC(NMethod code) {
  70     return code.instructionsBegin().addOffsetTo(getPCOffset());
  71   }
  72 
  73   public void print(NMethod code) {
  74     printOn(System.out, code);
  75   }
  76 
  77   public void printOn(PrintStream tty, NMethod code) {
  78     tty.println("PCDesc(" + getRealPC(code) + "):");
  79     for (ScopeDesc sd = code.getScopeDescAt(getRealPC(code));
  80          sd != null;
  81          sd = sd.sender()) {
  82       tty.print(" ");
  83       sd.getMethod().printValueOn(tty);
  84       tty.print("  @" + sd.getBCI());
  85       tty.print("  reexecute=" + sd.getReexecute());
  86       tty.println();
  87     }
  88   }
  89 }