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.hotspot.nodes.type; 26 27 import org.graalvm.compiler.core.common.CompressEncoding; 28 import org.graalvm.compiler.core.common.type.AbstractObjectStamp; 29 import org.graalvm.compiler.core.common.type.ObjectStamp; 30 import org.graalvm.compiler.core.common.type.Stamp; 31 import org.graalvm.compiler.debug.GraalError; 32 import org.graalvm.compiler.nodes.CompressionNode.CompressionOp; 33 import org.graalvm.compiler.nodes.type.NarrowOopStamp; 34 35 import jdk.vm.ci.hotspot.HotSpotCompressedNullConstant; 36 import jdk.vm.ci.hotspot.HotSpotMemoryAccessProvider; 37 import jdk.vm.ci.hotspot.HotSpotObjectConstant; 38 import jdk.vm.ci.meta.Constant; 39 import jdk.vm.ci.meta.JavaConstant; 40 import jdk.vm.ci.meta.MemoryAccessProvider; 41 import jdk.vm.ci.meta.ResolvedJavaType; 42 43 public final class HotSpotNarrowOopStamp extends NarrowOopStamp { 44 private HotSpotNarrowOopStamp(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull, CompressEncoding encoding) { 45 super(type, exactType, nonNull, alwaysNull, encoding); 46 } 47 48 @Override 49 protected AbstractObjectStamp copyWith(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull) { 50 return new HotSpotNarrowOopStamp(type, exactType, nonNull, alwaysNull, getEncoding()); 51 } 52 53 public static Stamp compressed(AbstractObjectStamp stamp, CompressEncoding encoding) { 54 return new HotSpotNarrowOopStamp(stamp.type(), stamp.isExactType(), stamp.nonNull(), stamp.alwaysNull(), encoding); 55 } 56 57 @Override 58 public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) { 59 try { 60 HotSpotMemoryAccessProvider hsProvider = (HotSpotMemoryAccessProvider) provider; 61 return hsProvider.readNarrowOopConstant(base, displacement); 62 } catch (IllegalArgumentException e) { 63 return null; 64 } 65 } 66 67 @Override 68 public JavaConstant asConstant() { 69 if (alwaysNull()) { 70 return HotSpotCompressedNullConstant.COMPRESSED_NULL; 71 } else { 72 return null; 73 } 74 } 75 76 @Override 77 public boolean isCompatible(Constant other) { 78 if (other instanceof HotSpotObjectConstant) { 79 return ((HotSpotObjectConstant) other).isCompressed(); 80 } 81 return true; 82 } 83 84 public static Stamp mkStamp(CompressionOp op, Stamp input, CompressEncoding encoding) { 85 switch (op) { 86 case Compress: 87 if (input instanceof ObjectStamp) { 88 // compressed oop 89 return HotSpotNarrowOopStamp.compressed((ObjectStamp) input, encoding); 90 } else if (input instanceof KlassPointerStamp) { 91 // compressed klass pointer 92 return ((KlassPointerStamp) input).compressed(encoding); 93 } 94 break; 95 case Uncompress: 96 if (input instanceof NarrowOopStamp) { 97 // oop 98 assert encoding.equals(((NarrowOopStamp) input).getEncoding()); 99 return ((NarrowOopStamp) input).uncompressed(); 100 } else if (input instanceof KlassPointerStamp) { 101 // metaspace pointer 102 assert encoding.equals(((KlassPointerStamp) input).getEncoding()); 103 return ((KlassPointerStamp) input).uncompressed(); 104 } 105 break; 106 } 107 throw GraalError.shouldNotReachHere(String.format("Unexpected input stamp %s", input)); 108 } 109 110 }