1 /*
   2  * Copyright (c) 2014, 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.hotspot;
  24 
  25 import java.util.Objects;
  26 
  27 import jdk.vm.ci.meta.Constant;
  28 import jdk.vm.ci.meta.VMConstant;
  29 
  30 final class HotSpotMetaspaceConstantImpl implements HotSpotMetaspaceConstant, VMConstant {
  31 
  32     static HotSpotMetaspaceConstantImpl forMetaspaceObject(MetaspaceWrapperObject metaspaceObject, boolean compressed) {
  33         return new HotSpotMetaspaceConstantImpl(metaspaceObject, compressed);
  34     }
  35 
  36     static MetaspaceWrapperObject getMetaspaceObject(Constant constant) {
  37         return ((HotSpotMetaspaceConstantImpl) constant).metaspaceObject;
  38     }
  39 
  40     private final MetaspaceWrapperObject metaspaceObject;
  41     private final boolean compressed;
  42 
  43     private HotSpotMetaspaceConstantImpl(MetaspaceWrapperObject metaspaceObject, boolean compressed) {
  44         this.metaspaceObject = metaspaceObject;
  45         this.compressed = compressed;
  46     }
  47 
  48     @Override
  49     public int hashCode() {
  50         return System.identityHashCode(metaspaceObject) ^ (compressed ? 1 : 2);
  51     }
  52 
  53     @Override
  54     public boolean equals(Object o) {
  55         if (o == this) {
  56             return true;
  57         }
  58         if (!(o instanceof HotSpotMetaspaceConstantImpl)) {
  59             return false;
  60         }
  61 
  62         HotSpotMetaspaceConstantImpl other = (HotSpotMetaspaceConstantImpl) o;
  63         return Objects.equals(this.metaspaceObject, other.metaspaceObject) && this.compressed == other.compressed;
  64     }
  65 
  66     @Override
  67     public String toValueString() {
  68         return String.format("meta{%s%s}", metaspaceObject, compressed ? ";compressed" : "");
  69     }
  70 
  71     @Override
  72     public String toString() {
  73         return toValueString();
  74     }
  75 
  76     public boolean isDefaultForKind() {
  77         return false;
  78     }
  79 
  80     public boolean isCompressed() {
  81         return compressed;
  82     }
  83 
  84     public Constant compress() {
  85         assert !isCompressed();
  86         HotSpotMetaspaceConstantImpl res = HotSpotMetaspaceConstantImpl.forMetaspaceObject(metaspaceObject, true);
  87         assert res.isCompressed();
  88         return res;
  89     }
  90 
  91     public Constant uncompress() {
  92         assert isCompressed();
  93         HotSpotMetaspaceConstantImpl res = HotSpotMetaspaceConstantImpl.forMetaspaceObject(metaspaceObject, false);
  94         assert !res.isCompressed();
  95         return res;
  96     }
  97 
  98     public HotSpotResolvedObjectType asResolvedJavaType() {
  99         if (metaspaceObject instanceof HotSpotResolvedObjectType) {
 100             return (HotSpotResolvedObjectType) metaspaceObject;
 101         }
 102         return null;
 103     }
 104 
 105     public HotSpotResolvedJavaMethod asResolvedJavaMethod() {
 106         if (metaspaceObject instanceof HotSpotResolvedJavaMethod) {
 107             return (HotSpotResolvedJavaMethod) metaspaceObject;
 108         }
 109         return null;
 110     }
 111 }