1 /* 2 * Copyright (c) 2009, 2019, 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 static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime; 26 27 import jdk.vm.ci.meta.Assumptions; 28 import jdk.vm.ci.meta.JavaConstant; 29 import jdk.vm.ci.meta.JavaKind; 30 import jdk.vm.ci.meta.ResolvedJavaType; 31 32 /** 33 * Represents a constant non-{@code null} object reference, within the compiler and across the 34 * compiler/runtime interface. 35 */ 36 abstract class HotSpotObjectConstantImpl implements HotSpotObjectConstant { 37 38 protected final boolean compressed; 39 40 HotSpotObjectConstantImpl(boolean compressed) { 41 this.compressed = compressed; 42 } 43 44 @Override 45 public JavaKind getJavaKind() { 46 return JavaKind.Object; 47 } 48 49 @Override 50 public boolean isCompressed() { 51 return compressed; 52 } 53 54 @Override 55 public abstract JavaConstant compress(); 56 57 @Override 58 public abstract JavaConstant uncompress(); 59 60 @Override 61 public HotSpotResolvedObjectType getType() { 62 return runtime().reflection.getType(this); 63 } 64 65 @Override 66 public abstract int getIdentityHashCode(); 67 68 @Override 69 public JavaConstant getCallSiteTarget(Assumptions assumptions) { 70 if (runtime().getCallSite().isInstance(this)) { 71 HotSpotObjectConstantImpl target = (HotSpotObjectConstantImpl) runtime().getHostJVMCIBackend().getConstantReflection().readFieldValue( 72 HotSpotMethodHandleAccessProvider.Internals.instance().callSiteTargetField, this); 73 if (!runtime().getConstantCallSite().isInstance(this)) { 74 if (assumptions == null) { 75 return null; 76 } 77 assumptions.record(new Assumptions.CallSiteTargetValue(this, target)); 78 } 79 return target; 80 } 81 return null; 82 } 83 84 @Override 85 public boolean isInternedString() { 86 return runtime().compilerToVm.isInternedString(this); 87 } 88 89 @Override 90 public <T> T asObject(Class<T> type) { 91 return runtime().reflection.asObject(this, type); 92 } 93 94 @Override 95 public Object asObject(ResolvedJavaType type) { 96 return runtime().reflection.asObject(this, (HotSpotResolvedJavaType) type); 97 } 98 99 @Override 100 public boolean isNull() { 101 return false; 102 } 103 104 @Override 105 public boolean isDefaultForKind() { 106 return false; 107 } 108 109 @Override 110 public Object asBoxedPrimitive() { 111 throw new IllegalArgumentException(); 112 } 113 114 @Override 115 public int asInt() { 116 throw new IllegalArgumentException(); 117 } 118 119 @Override 120 public boolean asBoolean() { 121 throw new IllegalArgumentException(); 122 } 123 124 @Override 125 public long asLong() { 126 throw new IllegalArgumentException(); 127 } 128 129 @Override 130 public float asFloat() { 131 throw new IllegalArgumentException(); 132 } 133 134 @Override 135 public double asDouble() { 136 throw new IllegalArgumentException(); 137 } 138 139 @Override 140 public boolean equals(Object o) { 141 if (o == this) { 142 return true; 143 } else if (o instanceof HotSpotObjectConstantImpl) { 144 HotSpotObjectConstantImpl other = (HotSpotObjectConstantImpl) o; 145 return runtime().reflection.equals(this, other); 146 } 147 return false; 148 } 149 150 @Override 151 public int hashCode() { 152 return getIdentityHashCode(); 153 } 154 155 @Override 156 public String toValueString() { 157 if (runtime().getJavaLangString().isInstance(this)) { 158 return "\"" + runtime().reflection.asString(this) + "\""; 159 } else { 160 return runtime().reflection.formatString(this); 161 } 162 } 163 164 @Override 165 public String toString() { 166 return (compressed ? "NarrowOop" : getJavaKind().getJavaName()) + "[" + runtime().reflection.formatString(this) + "]"; 167 } 168 169 public JavaConstant readFieldValue(HotSpotResolvedJavaField field, boolean isVolatile) { 170 return runtime().reflection.readFieldValue(this, field, isVolatile); 171 } 172 173 public ResolvedJavaType asJavaType() { 174 return runtime().reflection.asJavaType(this); 175 } 176 }