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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/UnsafeAccessNode.java @ 11881:da9db8331658

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moved Canonicalizable and Simplifiable to the com.oracle.graal.graph project (GRAAL-506)
author Doug Simon <doug.simon@oracle.com>
date Tue, 01 Oct 2013 20:38:25 +0200
parents 9a747d8e0d0f
children 88fb9cba8751
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.nodes.extended;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.graph.spi.*;
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28 import com.oracle.graal.nodes.*;
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29 import com.oracle.graal.nodes.type.*;
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30
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31 public abstract class UnsafeAccessNode extends FixedWithNextNode implements Canonicalizable {
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32
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33 @Input private ValueNode object;
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34 @Input private ValueNode offset;
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35 private final int displacement;
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36 private final Kind accessKind;
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37
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38 public UnsafeAccessNode(Stamp stamp, ValueNode object, int displacement, ValueNode offset, Kind accessKind) {
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39 super(stamp);
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40 assert accessKind != null;
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41 this.object = object;
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42 this.displacement = displacement;
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43 this.offset = offset;
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44 this.accessKind = accessKind;
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45 }
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46
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47 public ValueNode object() {
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48 return object;
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49 }
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50
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51 public int displacement() {
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52 return displacement;
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53 }
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54
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55 public ValueNode offset() {
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56 return offset;
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57 }
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58
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59 public Kind accessKind() {
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60 return accessKind;
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61 }
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62
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63 @Override
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64 public Node canonical(CanonicalizerTool tool) {
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65 if (offset().isConstant()) {
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66 long constantOffset = offset().asConstant().asLong();
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67
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68 // Try to canonicalize to a field access.
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69 ResolvedJavaType receiverType = ObjectStamp.typeOrNull(object());
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70 if (receiverType != null) {
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71 ResolvedJavaField field = receiverType.findInstanceFieldWithOffset(displacement() + constantOffset);
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72 // No need for checking that the receiver is non-null. The field access includes
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73 // the null check and if a field is found, the offset is so small that this is
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74 // never a valid access of an arbitrary address.
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75 if (field != null && field.getKind() == this.accessKind()) {
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76 return cloneAsFieldAccess(field);
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77 }
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78 }
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79
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80 if (constantOffset != 0 && Integer.MAX_VALUE - displacement() >= constantOffset) {
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81 int intDisplacement = (int) (constantOffset + displacement());
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82 if (constantOffset == intDisplacement) {
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83 return cloneWithZeroOffset(intDisplacement);
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84 }
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85 }
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86 }
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87 return this;
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88 }
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89
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90 protected abstract ValueNode cloneAsFieldAccess(ResolvedJavaField field);
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91
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92 protected abstract ValueNode cloneWithZeroOffset(int intDisplacement);
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93 }