1 /* 2 * Copyright (c) 2014, 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.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.MemoryAccessProvider; 36 import jdk.vm.ci.meta.ResolvedJavaType; 37 38 public abstract class NarrowOopStamp extends AbstractObjectStamp { 39 40 private final CompressEncoding encoding; 41 42 protected NarrowOopStamp(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull, CompressEncoding encoding) { 43 super(type, exactType, nonNull, alwaysNull); 44 this.encoding = encoding; 45 } 46 47 @Override 48 public void accept(Visitor v) { 49 super.accept(v); 50 v.visitLong(encoding.getBase()); 51 v.visitInt(encoding.getShift()); 52 } 53 54 @Override 55 protected abstract AbstractObjectStamp copyWith(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull); 56 57 public Stamp uncompressed() { 58 return new ObjectStamp(type(), isExactType(), nonNull(), alwaysNull()); 59 } 60 61 public CompressEncoding getEncoding() { 62 return encoding; 63 } 64 65 @Override 66 public LIRKind getLIRKind(LIRKindTool tool) { 67 return tool.getNarrowOopKind(); 68 } 69 70 @Override 71 public String toString() { 72 StringBuilder str = new StringBuilder(); 73 str.append('n'); 74 appendString(str); 75 return str.toString(); 76 } 77 78 @Override 79 public boolean isCompatible(Stamp other) { 80 if (this == other) { 81 return true; 82 } 83 if (other instanceof NarrowOopStamp) { 84 NarrowOopStamp narrow = (NarrowOopStamp) other; 85 return encoding.equals(narrow.encoding); 86 } 87 return false; 88 } 89 90 @Override 91 public abstract Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement); 92 93 @Override 94 public int hashCode() { 95 final int prime = 31; 96 int result = super.hashCode(); 97 result = prime * result + encoding.hashCode(); 98 return result; 99 } 100 101 @Override 102 public boolean equals(Object obj) { 103 if (this == obj) { 104 return true; 105 } 106 if (obj == null || getClass() != obj.getClass()) { 107 return false; 108 } 109 NarrowOopStamp other = (NarrowOopStamp) obj; 110 if (!encoding.equals(other.encoding)) { 111 return false; 112 } 113 return super.equals(other); 114 } 115 116 @Override 117 public abstract boolean isCompatible(Constant other); 118 }