1 /*
   2  * Copyright (c) 2012, 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.oops;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.interpreter.*;
  31 import sun.jvm.hotspot.runtime.*;
  32 import sun.jvm.hotspot.types.*;
  33 import sun.jvm.hotspot.utilities.*;
  34 
  35 public class ExceptionTableElement {
  36   static {
  37     VM.registerVMInitializedObserver(new Observer() {
  38         public void update(Observable o, Object data) {
  39           initialize(VM.getVM().getTypeDataBase());
  40         }
  41       });
  42   }
  43 
  44   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
  45     Type type            = db.lookupType("ExceptionTableElement");
  46     offsetOfStartPC      = type.getCIntegerField("start_pc").getOffset();
  47     offsetOfEndPC        = type.getCIntegerField("end_pc").getOffset();
  48     offsetOfHandlerPC    = type.getCIntegerField("handler_pc").getOffset();
  49     offsetOfCatchTypeIndex = type.getCIntegerField("catch_type_index").getOffset();
  50   }
  51 
  52   private static long offsetOfStartPC;
  53   private static long offsetOfEndPC;
  54   private static long offsetOfHandlerPC;
  55   private static long offsetOfCatchTypeIndex;
  56 
  57   private OopHandle handle;
  58   private long      offset;
  59 
  60   public ExceptionTableElement(OopHandle handle, long offset) {
  61     this.handle = handle;
  62     this.offset = offset;
  63   }
  64 
  65   public int getStartPC() {
  66     return (int) handle.getCIntegerAt(offset + offsetOfStartPC, 2, true);
  67   }
  68 
  69   public int getEndPC() {
  70     return (int) handle.getCIntegerAt(offset + offsetOfEndPC, 2, true);
  71   }
  72 
  73   public int getHandlerPC() {
  74     return (int) handle.getCIntegerAt(offset + offsetOfHandlerPC, 2, true);
  75   }
  76 
  77   public int getCatchTypeIndex() {
  78     return (int) handle.getCIntegerAt(offset + offsetOfCatchTypeIndex, 2, true);
  79   }
  80 }
  81