1 /* 2 * Copyright (c) 2012, 2018, 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 24 25 package org.graalvm.compiler.core.common.type; 26 27 import org.graalvm.compiler.core.common.LIRKind; 28 import org.graalvm.compiler.core.common.spi.LIRKindTool; 29 30 import jdk.vm.ci.meta.Constant; 31 import jdk.vm.ci.meta.JavaConstant; 32 import jdk.vm.ci.meta.MemoryAccessProvider; 33 import jdk.vm.ci.meta.ResolvedJavaType; 34 import jdk.vm.ci.meta.UnresolvedJavaType; 35 36 public class ObjectStamp extends AbstractObjectStamp { 37 38 public ObjectStamp(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull) { 39 super(type, exactType, nonNull, alwaysNull); 40 } 41 42 @Override 43 protected ObjectStamp copyWith(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull) { 44 return new ObjectStamp(type, exactType, nonNull, alwaysNull); 45 } 46 47 @Override 48 public Stamp unrestricted() { 49 return StampFactory.object(); 50 } 51 52 @Override 53 public String toString() { 54 StringBuilder str = new StringBuilder(); 55 str.append('a'); 56 appendString(str); 57 return str.toString(); 58 } 59 60 @Override 61 public boolean isCompatible(Stamp other) { 62 if (this == other) { 63 return true; 64 } 65 if (other instanceof ObjectStamp) { 66 return true; 67 } 68 return false; 69 } 70 71 @Override 72 public boolean isCompatible(Constant constant) { 73 if (constant instanceof JavaConstant) { 74 return ((JavaConstant) constant).getJavaKind().isObject(); 75 } 76 return false; 77 } 78 79 @Override 80 public LIRKind getLIRKind(LIRKindTool tool) { 81 return tool.getObjectKind(); 82 } 83 84 @Override 85 public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) { 86 try { 87 return provider.readObjectConstant(base, displacement); 88 } catch (IllegalArgumentException e) { 89 /* 90 * It's possible that the base and displacement aren't valid together so simply return 91 * null. 92 */ 93 return null; 94 } 95 } 96 97 /** 98 * Convert an ObjectStamp into a representation that can be resolved symbolically into the 99 * original stamp. 100 */ 101 @Override 102 public SymbolicJVMCIReference<ObjectStamp> makeSymbolic() { 103 if (type() == null) { 104 return null; 105 } 106 return new SymbolicObjectStamp(this); 107 } 108 109 static class SymbolicObjectStamp implements SymbolicJVMCIReference<ObjectStamp> { 110 UnresolvedJavaType type; 111 private boolean exactType; 112 private boolean nonNull; 113 private boolean alwaysNull; 114 115 SymbolicObjectStamp(ObjectStamp stamp) { 116 if (stamp.type() != null) { 117 type = UnresolvedJavaType.create(stamp.type().getName()); 118 } 119 exactType = stamp.isExactType(); 120 nonNull = stamp.nonNull(); 121 alwaysNull = stamp.alwaysNull(); 122 } 123 124 @Override 125 public ObjectStamp resolve(ResolvedJavaType accessingClass) { 126 return new ObjectStamp(type != null ? type.resolve(accessingClass) : null, exactType, nonNull, alwaysNull); 127 } 128 129 @Override 130 public String toString() { 131 return "SymbolicObjectStamp{" + 132 "declaringType=" + type + 133 ", exactType=" + exactType + 134 ", nonNull=" + nonNull + 135 ", alwaysNull=" + alwaysNull + 136 '}'; 137 } 138 } 139 140 }