1 /*
   2  * Copyright (c) 2016, 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 package jdk.vm.ci.code.site;
  24 
  25 /**
  26  * Represents a pointer to some location in the data section that should be {@link DataPatch
  27  * patched} into the code.
  28  */
  29 public final class DataSectionReference extends Reference {
  30 
  31     private boolean initialized;
  32     private int offset;
  33 
  34     public DataSectionReference() {
  35         // will be set after the data section layout is fixed
  36         offset = 0xDEADDEAD;
  37     }
  38 
  39     public int getOffset() {
  40         assert initialized;
  41 
  42         return offset;
  43     }
  44 
  45     public void setOffset(int offset) {
  46         assert !initialized;
  47         initialized = true;
  48 
  49         this.offset = offset;
  50     }
  51 
  52     @Override
  53     public int hashCode() {
  54         return offset;
  55     }
  56 
  57     @Override
  58     public boolean equals(Object obj) {
  59         if (this == obj) {
  60             return true;
  61         }
  62         if (obj instanceof DataSectionReference) {
  63             DataSectionReference that = (DataSectionReference) obj;
  64             return this.offset == that.offset;
  65         }
  66         return false;
  67     }
  68 
  69     @Override
  70     public String toString() {
  71         if (initialized) {
  72             return String.format("DataSection[0x%x]", offset);
  73         } else {
  74             return "DataSection[?]";
  75         }
  76     }
  77 }