1 /*
   2  * Copyright 2009 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 
  30 import sun.jvm.hotspot.debugger.*;
  31 import sun.jvm.hotspot.utilities.*;
  32 
  33 /** An ObjectValue describes an object eliminated by escape analysis. */
  34 
  35 public class ObjectValue extends ScopeValue {
  36   private int        id;
  37   private ScopeValue klass;
  38   private List       fieldsValue; // ArrayList<ScopeValue>
  39 
  40   // Field "boolean visited" is not implemented here since
  41   // it is used only a during debug info creation.
  42 
  43   public ObjectValue(int id) {
  44     this.id = id;
  45     klass   = null;
  46     fieldsValue = new ArrayList();
  47   }
  48 
  49   public boolean isObject() { return true; }
  50   public int id() { return id; }
  51   public ScopeValue getKlass() { return klass; }
  52   public List getFieldsValue() { return fieldsValue; }
  53   public ScopeValue getFieldAt(int i) { return (ScopeValue)fieldsValue.get(i); }
  54   public int fieldsSize() { return fieldsValue.size(); }
  55 
  56   // Field "value" is always NULL here since it is used
  57   // only during deoptimization of a compiled frame
  58   // pointing to reallocated object.
  59   public OopHandle getValue() { return null; }
  60 
  61   /** Serialization of debugging information */
  62 
  63   void readObject(DebugInfoReadStream stream) {
  64     klass = readFrom(stream);
  65     Assert.that(klass.isConstantOop(), "should be constant klass oop");
  66     int length = stream.readInt();
  67     for (int i = 0; i < length; i++) {
  68       ScopeValue val = readFrom(stream);
  69       fieldsValue.add(val);
  70     }
  71   }
  72 
  73   // Printing
  74 
  75   public void print() {
  76     printOn(System.out);
  77   }
  78 
  79   public void printOn(PrintStream tty) {
  80     tty.print("scalarObj[" + id + "]");
  81   }
  82 
  83   void printFieldsOn(PrintStream tty) {
  84     if (fieldsValue.size() > 0) {
  85       ((ScopeValue)fieldsValue.get(0)).printOn(tty);
  86     }
  87     for (int i = 1; i < fieldsValue.size(); i++) {
  88       tty.print(", ");
  89       ((ScopeValue)fieldsValue.get(i)).printOn(tty);
  90     }
  91   }
  92 
  93 };