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 24 25 package org.graalvm.compiler.nodes.type; 26 27 import org.graalvm.compiler.core.common.CompressEncoding; 28 import org.graalvm.compiler.core.common.LIRKind; 29 import org.graalvm.compiler.core.common.spi.LIRKindTool; 30 import org.graalvm.compiler.core.common.type.AbstractObjectStamp; 31 import org.graalvm.compiler.core.common.type.ObjectStamp; 32 import org.graalvm.compiler.core.common.type.Stamp; 33 34 import jdk.vm.ci.meta.Constant; 35 import jdk.vm.ci.meta.JavaConstant; 36 import jdk.vm.ci.meta.MemoryAccessProvider; 37 import jdk.vm.ci.meta.ResolvedJavaType; 38 39 public abstract class NarrowOopStamp extends AbstractObjectStamp { 40 41 private final CompressEncoding encoding; 42 43 protected NarrowOopStamp(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull, CompressEncoding encoding) { 44 super(type, exactType, nonNull, alwaysNull); 45 this.encoding = encoding; 46 } 47 48 @Override 49 protected abstract AbstractObjectStamp copyWith(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull); 50 51 public Stamp uncompressed() { 52 return new ObjectStamp(type(), isExactType(), nonNull(), alwaysNull()); 53 } 54 55 public CompressEncoding getEncoding() { 56 return encoding; 57 } 58 59 @Override 60 public LIRKind getLIRKind(LIRKindTool tool) { 61 return tool.getNarrowOopKind(); 62 } 63 64 @Override 65 public String toString() { 66 StringBuilder str = new StringBuilder(); 67 str.append('n'); 68 appendString(str); 69 return str.toString(); 70 } 71 72 @Override 73 public boolean isCompatible(Stamp other) { 74 if (this == other) { 75 return true; 76 } 77 if (other instanceof NarrowOopStamp) { 78 NarrowOopStamp narrow = (NarrowOopStamp) other; 79 return encoding.equals(narrow.encoding); 80 } 81 return false; 82 } 83 84 @Override 85 public abstract Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement); 86 87 @Override 88 public int hashCode() { 89 final int prime = 31; 90 int result = super.hashCode(); 91 result = prime * result + encoding.hashCode(); 92 return result; 93 } 94 95 @Override 96 public boolean equals(Object obj) { 97 if (this == obj) { 98 return true; 99 } 100 if (obj == null || getClass() != obj.getClass()) { 101 return false; 102 } 103 NarrowOopStamp other = (NarrowOopStamp) obj; 104 if (!encoding.equals(other.encoding)) { 105 return false; 106 } 107 return super.equals(other); 108 } 109 110 @Override 111 public abstract JavaConstant asConstant(); 112 113 @Override 114 public abstract boolean isCompatible(Constant other); 115 }