1 /*
   2  * Copyright (c) 2009, 2015, 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.hotspot;
  24 
  25 import java.util.Arrays;
  26 
  27 import jdk.vm.ci.code.Location;
  28 import jdk.vm.ci.code.ReferenceMap;
  29 
  30 /**
  31  * Describes where the object references are in machine state, compliant with what HotSpot expects.
  32  */
  33 public final class HotSpotReferenceMap extends ReferenceMap {
  34 
  35     private final Location[] objects;
  36     private final Location[] derivedBase;
  37     private final int[] sizeInBytes;
  38     private final int maxRegisterSize;
  39 
  40     /**
  41      *
  42      * @param objects This array is now owned by this object and must not be mutated by the caller.
  43      * @param derivedBase This array is now owned by this object and must not be mutated by the
  44      *            caller.
  45      * @param sizeInBytes This array is now owned by this object and must not be mutated by the
  46      *            caller.
  47      */
  48     @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `objects`, `derivedBase` and `sizeInBytes`")
  49     public HotSpotReferenceMap(Location[] objects, Location[] derivedBase, int[] sizeInBytes, int maxRegisterSize) {
  50         this.objects = objects;
  51         this.derivedBase = derivedBase;
  52         this.sizeInBytes = sizeInBytes;
  53         this.maxRegisterSize = maxRegisterSize;
  54     }
  55 
  56     @Override
  57     public int hashCode() {
  58         throw new UnsupportedOperationException();
  59     }
  60 
  61     @Override
  62     public boolean equals(Object obj) {
  63         if (this == obj) {
  64             return true;
  65         }
  66         if (obj instanceof HotSpotReferenceMap) {
  67             HotSpotReferenceMap that = (HotSpotReferenceMap) obj;
  68             if (sizeInBytes == that.sizeInBytes && maxRegisterSize == that.maxRegisterSize && Arrays.equals(objects, that.objects) && Arrays.equals(derivedBase, that.derivedBase)) {
  69                 return true;
  70             }
  71         }
  72         return false;
  73     }
  74 
  75     @Override
  76     public String toString() {
  77         return Arrays.toString(objects);
  78     }
  79 }