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.utilities.*;
  30 import sun.jvm.hotspot.debugger.*;
  31 import sun.jvm.hotspot.runtime.*;
  32 import sun.jvm.hotspot.types.*;
  33 
  34 abstract public class Metadata extends VMObject {
  35   static {
  36     VM.registerVMInitializedObserver(new Observer() {
  37         public void update(Observable o, Object data) {
  38           initialize(VM.getVM().getTypeDataBase());
  39         }
  40       });
  41   }
  42 
  43   public Metadata(Address addr) {
  44     super(addr);
  45   }
  46 
  47   public static long alignSize(long size) {
  48     // natural word size.
  49     return VM.getVM().alignUp(size, VM.getVM().getBytesPerWord());
  50   }
  51 
  52   private static VirtualBaseConstructor<Metadata> metadataConstructor;
  53 
  54   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
  55     metadataConstructor = new VirtualBaseConstructor<Metadata>(db, db.lookupType("Metadata"), null, null);
  56     // Define an explicit mapping since the C++ and Java type names don't match.
  57     metadataConstructor.addMapping("Metadata", Metadata.class);
  58     metadataConstructor.addMapping("Klass", Klass.class);
  59     metadataConstructor.addMapping("InstanceKlass", InstanceKlass.class);
  60     metadataConstructor.addMapping("InstanceMirrorKlass", InstanceMirrorKlass.class);
  61     metadataConstructor.addMapping("InstanceRefKlass", InstanceRefKlass.class);
  62     metadataConstructor.addMapping("InstanceClassLoaderKlass", InstanceClassLoaderKlass.class);
  63     metadataConstructor.addMapping("TypeArrayKlass", TypeArrayKlass.class);
  64     metadataConstructor.addMapping("ObjArrayKlass", ObjArrayKlass.class);
  65     metadataConstructor.addMapping("Method", Method.class);
  66     metadataConstructor.addMapping("MethodData", MethodData.class);
  67     metadataConstructor.addMapping("ConstMethod", ConstMethod.class);
  68     metadataConstructor.addMapping("ConstantPool", ConstantPool.class);
  69     metadataConstructor.addMapping("ConstantPoolCache", ConstantPoolCache.class);
  70   }
  71 
  72   public static Metadata instantiateWrapperFor(Address addr) {
  73     return metadataConstructor.instantiateWrapperFor(addr);
  74   }
  75 
  76   public void iterate(MetadataVisitor visitor) {
  77     visitor.setObj(this);
  78     visitor.prologue();
  79     iterateFields(visitor);
  80     visitor.epilogue();
  81   }
  82 
  83   void iterateFields(MetadataVisitor visitor) {
  84   }
  85 
  86   abstract public void printValueOn(PrintStream tty);
  87   public void dumpReplayData(PrintStream out) {
  88       out.println("# Unknown Metadata");
  89   }
  90 }