1 /*
   2  * Copyright (c) 2000, 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 sun.jvm.hotspot.debugger.*;
  28 import sun.jvm.hotspot.runtime.VM;
  29 import sun.jvm.hotspot.runtime.VMObject;
  30 
  31 // The class for an oop field simply provides access to the value.
  32 public class OopField extends Field {
  33   public OopField(FieldIdentifier id, long offset, boolean isVMField) {
  34     super(id, offset, isVMField);
  35   }
  36 
  37   public OopField(sun.jvm.hotspot.types.OopField vmField, long startOffset) {
  38     super(new NamedFieldIdentifier(vmField.getName()), vmField.getOffset() + startOffset, true);
  39   }
  40 
  41   public OopField(InstanceKlass holder, int fieldArrayIndex) {
  42     super(holder, fieldArrayIndex);
  43   }
  44 
  45   public Oop getValue(Oop obj) {
  46     if (!isVMField() && !obj.isInstance() && !obj.isArray()) {
  47       throw new InternalError();
  48     }
  49     return obj.getHeap().newOop(getValueAsOopHandle(obj));
  50   }
  51 
  52   /** Debugging support */
  53   public OopHandle getValueAsOopHandle(Oop obj) {
  54     if (!isVMField() && !obj.isInstance() && !obj.isArray()) {
  55       throw new InternalError(obj.toString());
  56     }
  57 
  58     return VM.getVM().getUniverse().heap().oop_load_at(obj.getHandle(), getOffset());
  59   }
  60 
  61   public Oop getValue(VMObject obj) {
  62     return VM.getVM().getObjectHeap().newOop(getValueAsOopHandle(obj));
  63   }
  64 
  65   /** Debugging support */
  66   public OopHandle getValueAsOopHandle(VMObject obj) {
  67     return obj.getAddress().getOopHandleAt(getOffset());
  68   }
  69 
  70   public void setValue(Oop obj) throws MutationException {
  71     // Fix this: setOopAt is missing in Address
  72   }
  73 }