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 35 public class ObjectStamp extends AbstractObjectStamp { 36 37 public ObjectStamp(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull) { 38 super(type, exactType, nonNull, alwaysNull); 39 } 40 41 @Override 42 protected ObjectStamp copyWith(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull) { 43 return new ObjectStamp(type, exactType, nonNull, alwaysNull); 44 } 45 46 @Override 47 public Stamp unrestricted() { 48 return StampFactory.object(); 49 } 50 51 @Override 52 public String toString() { 53 StringBuilder str = new StringBuilder(); 54 str.append('a'); 55 appendString(str); 56 return str.toString(); 57 } 58 59 @Override 60 public boolean isCompatible(Stamp other) { 61 if (this == other) { 62 return true; 63 } 64 if (other instanceof ObjectStamp) { 65 return true; 66 } 67 return false; 68 } 69 70 @Override 71 public boolean isCompatible(Constant constant) { 72 if (constant instanceof JavaConstant) { 73 return ((JavaConstant) constant).getJavaKind().isObject(); 74 } 75 return false; 76 } 77 78 @Override 79 public LIRKind getLIRKind(LIRKindTool tool) { 80 return tool.getObjectKind(); 81 } 82 83 @Override 84 public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) { 85 try { 86 return provider.readObjectConstant(base, displacement); 87 } catch (IllegalArgumentException e) { 88 /* 89 * It's possible that the base and displacement aren't valid together so simply return 90 * null. 91 */ 92 return null; 93 } 94 } 95 }