1 /* 2 * Copyright (c) 2015, 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.nodes.memory.address; 24 25 import org.graalvm.compiler.core.common.type.ObjectStamp; 26 import org.graalvm.compiler.graph.Node; 27 import org.graalvm.compiler.graph.NodeClass; 28 import org.graalvm.compiler.graph.spi.Canonicalizable; 29 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 30 import org.graalvm.compiler.nodeinfo.InputType; 31 import org.graalvm.compiler.nodeinfo.NodeInfo; 32 import org.graalvm.compiler.nodes.PiNode; 33 import org.graalvm.compiler.nodes.ValueNode; 34 import org.graalvm.compiler.nodes.calc.BinaryArithmeticNode; 35 import org.graalvm.compiler.nodes.spi.PiPushable; 36 import org.graalvm.compiler.nodes.type.StampTool; 37 38 import jdk.vm.ci.meta.JavaKind; 39 import jdk.vm.ci.meta.ResolvedJavaField; 40 import jdk.vm.ci.meta.ResolvedJavaType; 41 42 /** 43 * Represents an address that is composed of a base and an offset. The base can be either a 44 * {@link JavaKind#Object}, a word-sized integer or another pointer. The offset must be a word-sized 45 * integer. 46 */ 47 @NodeInfo(allowedUsageTypes = InputType.Association) 48 public class OffsetAddressNode extends AddressNode implements Canonicalizable, PiPushable { 49 public static final NodeClass<OffsetAddressNode> TYPE = NodeClass.create(OffsetAddressNode.class); 50 51 @Input ValueNode base; 52 @Input ValueNode offset; 53 54 public OffsetAddressNode(ValueNode base, ValueNode offset) { 55 super(TYPE); 56 this.base = base; 57 this.offset = offset; 58 } 59 60 public ValueNode getBase() { 61 return base; 62 } 63 64 public void setBase(ValueNode base) { 65 updateUsages(this.base, base); 66 this.base = base; 67 } 68 69 public ValueNode getOffset() { 70 return offset; 71 } 72 73 public void setOffset(ValueNode offset) { 74 updateUsages(this.offset, offset); 75 this.offset = offset; 76 } 77 78 @Override 79 public Node canonical(CanonicalizerTool tool) { 80 if (base instanceof RawAddressNode) { 81 // The RawAddressNode is redundant, just directly use its input as base. 82 return new OffsetAddressNode(((RawAddressNode) base).getAddress(), offset); 83 } else if (base instanceof OffsetAddressNode) { 84 // Rewrite (&base[offset1])[offset2] to base[offset1 + offset2]. 85 OffsetAddressNode b = (OffsetAddressNode) base; 86 return new OffsetAddressNode(b.getBase(), BinaryArithmeticNode.add(b.getOffset(), this.getOffset())); 87 } else { 88 return this; 89 } 90 } 91 92 @Override 93 public boolean push(PiNode parent) { 94 if (!(offset.isConstant() && parent.stamp() instanceof ObjectStamp && parent.object().stamp() instanceof ObjectStamp)) { 95 return false; 96 } 97 98 ObjectStamp piStamp = (ObjectStamp) parent.stamp(); 99 ResolvedJavaType receiverType = piStamp.type(); 100 if (receiverType == null) { 101 return false; 102 } 103 ResolvedJavaField field = receiverType.findInstanceFieldWithOffset(offset.asJavaConstant().asLong(), JavaKind.Void); 104 if (field == null) { 105 // field was not declared by receiverType 106 return false; 107 } 108 109 ObjectStamp valueStamp = (ObjectStamp) parent.object().stamp(); 110 ResolvedJavaType valueType = StampTool.typeOrNull(valueStamp); 111 if (valueType != null && field.getDeclaringClass().isAssignableFrom(valueType)) { 112 if (piStamp.nonNull() == valueStamp.nonNull() && piStamp.alwaysNull() == valueStamp.alwaysNull()) { 113 replaceFirstInput(parent, parent.object()); 114 return true; 115 } 116 } 117 118 return false; 119 } 120 121 @NodeIntrinsic 122 public static native Address address(Object base, long offset); 123 }