1 /* 2 * Copyright (c) 2014, 2015, 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 package org.graalvm.compiler.hotspot.nodes.type; 24 25 import org.graalvm.compiler.core.common.type.AbstractPointerStamp; 26 import org.graalvm.compiler.core.common.type.Stamp; 27 28 import jdk.vm.ci.hotspot.HotSpotMemoryAccessProvider; 29 import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant; 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.MetaAccessProvider; 34 35 public final class MethodPointerStamp extends MetaspacePointerStamp { 36 37 private static final MethodPointerStamp METHOD = new MethodPointerStamp(false, false); 38 39 private static final MethodPointerStamp METHOD_NON_NULL = new MethodPointerStamp(true, false); 40 41 private static final MethodPointerStamp METHOD_ALWAYS_NULL = new MethodPointerStamp(false, true); 42 43 public static MethodPointerStamp method() { 44 return METHOD; 45 } 46 47 public static MethodPointerStamp methodNonNull() { 48 return METHOD_NON_NULL; 49 } 50 51 private MethodPointerStamp(boolean nonNull, boolean alwaysNull) { 52 super(nonNull, alwaysNull); 53 } 54 55 @Override 56 protected AbstractPointerStamp copyWith(boolean newNonNull, boolean newAlwaysNull) { 57 if (newNonNull) { 58 assert !newAlwaysNull; 59 return METHOD_NON_NULL; 60 } else if (newAlwaysNull) { 61 return METHOD_ALWAYS_NULL; 62 } else { 63 return METHOD; 64 } 65 } 66 67 @Override 68 public boolean isCompatible(Stamp otherStamp) { 69 if (this == otherStamp) { 70 return true; 71 } 72 return otherStamp instanceof MethodPointerStamp; 73 } 74 75 @Override 76 public boolean isCompatible(Constant constant) { 77 if (constant instanceof HotSpotMetaspaceConstant) { 78 return ((HotSpotMetaspaceConstant) constant).asResolvedJavaMethod() != null; 79 } else { 80 return super.isCompatible(constant); 81 } 82 } 83 84 @Override 85 public Stamp constant(Constant c, MetaAccessProvider meta) { 86 if (JavaConstant.NULL_POINTER.equals(c)) { 87 return METHOD_ALWAYS_NULL; 88 } else { 89 assert c instanceof HotSpotMetaspaceConstant; 90 return METHOD_NON_NULL; 91 } 92 } 93 94 @Override 95 public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) { 96 HotSpotMemoryAccessProvider hsProvider = (HotSpotMemoryAccessProvider) provider; 97 return hsProvider.readMethodPointerConstant(base, displacement); 98 } 99 100 @Override 101 public String toString() { 102 StringBuilder ret = new StringBuilder("Method*"); 103 appendString(ret); 104 return ret.toString(); 105 } 106 }