1 /* 2 * Copyright (c) 2014, 2025, 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(MetaspaceObject metaspaceObject, boolean compressed) { 33 return new HotSpotMetaspaceConstantImpl(metaspaceObject, compressed); 34 } 35 36 static MetaspaceObject getMetaspaceObject(Constant constant) { 37 return ((HotSpotMetaspaceConstantImpl) constant).metaspaceObject; 38 } 39 40 private final MetaspaceObject metaspaceObject; 41 private final boolean compressed; 42 43 private HotSpotMetaspaceConstantImpl(MetaspaceObject metaspaceObject, boolean compressed) { 44 this.metaspaceObject = metaspaceObject; 45 this.compressed = compressed; 46 if (compressed && !canBeStoredInCompressibleMetaSpace()) { 47 throw new IllegalArgumentException("constant cannot be compressed: " + metaspaceObject); 48 } 49 } 50 51 @Override 52 public int hashCode() { 53 return System.identityHashCode(metaspaceObject) ^ (compressed ? 1 : 2); 54 } 55 56 @Override 57 public boolean equals(Object o) { 58 if (o == this) { 59 return true; 60 } 61 if (!(o instanceof HotSpotMetaspaceConstantImpl)) { 62 return false; 63 } 64 65 HotSpotMetaspaceConstantImpl other = (HotSpotMetaspaceConstantImpl) o; 66 return Objects.equals(this.metaspaceObject, other.metaspaceObject) && this.compressed == other.compressed; 67 } 68 69 @Override 70 public String toValueString() { 71 return String.format("meta{%s%s}", metaspaceObject, compressed ? ";compressed" : ""); 72 } 73 74 @Override 75 public String toString() { 76 return toValueString(); 77 } 78 79 @Override 80 public boolean isDefaultForKind() { 81 return false; 82 } 83 84 @Override 85 public boolean isCompressed() { 86 return compressed; 87 } 88 89 @Override 90 public boolean isCompressible() { 91 if (compressed) { 92 return false; 93 } 94 return canBeStoredInCompressibleMetaSpace(); 95 } 96 97 private boolean canBeStoredInCompressibleMetaSpace() { 98 if (!HotSpotVMConfig.config().useClassMetaspaceForAllClasses && metaspaceObject instanceof HotSpotResolvedJavaType t && !t.isArray()) { 99 // As of JDK-8338526, interface and abstract types are not stored 100 // in compressible metaspace. 101 return !t.isInterface() && !t.isAbstract(); 102 } 103 return true; 104 } 105 106 @Override 107 public Constant compress() { 108 if (compressed) { 109 throw new IllegalArgumentException("already compressed: " + this); 110 } 111 HotSpotMetaspaceConstantImpl res = HotSpotMetaspaceConstantImpl.forMetaspaceObject(metaspaceObject, true); 112 assert res.isCompressed(); 113 return res; 114 } 115 116 @Override 117 public Constant uncompress() { 118 if (!compressed) { 119 throw new IllegalArgumentException("not compressed: " + this); 120 } 121 HotSpotMetaspaceConstantImpl res = HotSpotMetaspaceConstantImpl.forMetaspaceObject(metaspaceObject, false); 122 assert !res.isCompressed(); 123 return res; 124 } 125 126 @Override 127 public HotSpotResolvedObjectType asResolvedJavaType() { 128 if (metaspaceObject instanceof HotSpotResolvedObjectType) { 129 return (HotSpotResolvedObjectType) metaspaceObject; 130 } 131 return null; 132 } 133 134 @Override 135 public HotSpotResolvedJavaMethod asResolvedJavaMethod() { 136 if (metaspaceObject instanceof HotSpotResolvedJavaMethod) { 137 return (HotSpotResolvedJavaMethod) metaspaceObject; 138 } 139 return null; 140 } 141 }