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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/CheckCastNode.java @ 16252:a762ddb12b43

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change some node types from Canonicalizable to Simplifiable
author Lukas Stadler <lukas.stadler@oracle.com>
date Thu, 26 Jun 2014 16:27:36 +0200
parents 1ddee372bf62
children 7f20dee1be60
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 2014, 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.java;
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24
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25 import static com.oracle.graal.api.meta.DeoptimizationAction.*;
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26 import static com.oracle.graal.api.meta.DeoptimizationReason.*;
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27 import static com.oracle.graal.nodes.extended.BranchProbabilityNode.*;
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28
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29 import com.oracle.graal.api.meta.*;
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30 import com.oracle.graal.api.meta.ProfilingInfo.TriState;
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31 import com.oracle.graal.compiler.common.type.*;
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32 import com.oracle.graal.graph.*;
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33 import com.oracle.graal.graph.spi.*;
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34 import com.oracle.graal.nodes.*;
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35 import com.oracle.graal.nodes.calc.*;
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36 import com.oracle.graal.nodes.spi.*;
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37 import com.oracle.graal.nodes.type.*;
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38
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39 /**
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40 * Implements a type check against a compile-time known type.
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41 */
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42 public class CheckCastNode extends FixedWithNextNode implements Canonicalizable, Simplifiable, Lowerable, Virtualizable, ValueProxy {
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43
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44 @Input private ValueNode object;
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45 private final ResolvedJavaType type;
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46 private final JavaTypeProfile profile;
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47
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48 /**
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49 * Determines the exception thrown by this node if the check fails: {@link ClassCastException}
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50 * if false; {@link ArrayStoreException} if true.
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51 */
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52 private final boolean forStoreCheck;
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53
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54 /**
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55 * Creates a new CheckCast instruction.
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56 *
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57 * @param type the type being cast to
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58 * @param object the instruction producing the object
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59 */
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60 public CheckCastNode(ResolvedJavaType type, ValueNode object, JavaTypeProfile profile, boolean forStoreCheck) {
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61 super(StampFactory.declared(type));
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62 assert type != null;
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63 this.type = type;
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64 this.object = object;
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65 this.profile = profile;
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66 this.forStoreCheck = forStoreCheck;
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67 }
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68
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69 public boolean isForStoreCheck() {
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70 return forStoreCheck;
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71 }
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72
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73 /**
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74 * Lowers a {@link CheckCastNode} to a {@link GuardingPiNode}. That is:
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75 *
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76 * <pre>
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77 * 1: A a = ...
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78 * 2: B b = (B) a;
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79 * </pre>
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80 *
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81 * is lowered to:
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82 *
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83 * <pre>
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84 * 1: A a = ...
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85 * 2: B b = guardingPi(a == null || a instanceof B, a, stamp(B))
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86 * </pre>
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87 *
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88 * or if a is known to be non-null:
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89 *
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90 * <pre>
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91 * 1: A a = ...
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92 * 2: B b = guardingPi(a instanceof B, a, stamp(B, non-null))
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93 * </pre>
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94 *
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95 * Note: we use {@link Graph#addWithoutUnique} as opposed to {@link Graph#unique} for the new
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96 * {@link InstanceOfNode} to maintain the invariant checked by
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97 * {@code LoweringPhase.checkUsagesAreScheduled()}.
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98 */
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99 @Override
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100 public void lower(LoweringTool tool) {
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101 Stamp stamp = StampFactory.declared(type);
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102 if (stamp() instanceof ObjectStamp && object().stamp() instanceof ObjectStamp) {
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103 stamp = ((ObjectStamp) object().stamp()).castTo((ObjectStamp) stamp);
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104 }
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105 ValueNode condition;
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106 if (stamp instanceof IllegalStamp) {
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107 // This is a check cast that will always fail
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108 condition = LogicConstantNode.contradiction(graph());
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109 stamp = StampFactory.declared(type);
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110 } else if (StampTool.isObjectNonNull(object)) {
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111 condition = graph().addWithoutUnique(new InstanceOfNode(type, object, profile));
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112 } else {
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113 if (profile != null && profile.getNullSeen() == TriState.FALSE) {
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114 FixedGuardNode nullCheck = graph().add(new FixedGuardNode(graph().unique(new IsNullNode(object)), UnreachedCode, InvalidateReprofile, true));
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115 PiNode nullGuarded = graph().unique(new PiNode(object, object().stamp().join(StampFactory.objectNonNull()), nullCheck));
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116 InstanceOfNode typeTest = graph().addWithoutUnique(new InstanceOfNode(type, nullGuarded, profile));
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117 graph().addBeforeFixed(this, nullCheck);
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118 condition = typeTest;
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119 stamp = stamp.join(StampFactory.objectNonNull());
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120 nullCheck.lower(tool);
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121 } else {
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122 // TODO (ds) replace with probability of null-seen when available
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123 double shortCircuitProbability = NOT_FREQUENT_PROBABILITY;
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124 InstanceOfNode typeTest = graph().addWithoutUnique(new InstanceOfNode(type, object, profile));
11582
9e12e51fe7b2 Add helper methods with negations for inputs in LogicNode. Use helper method in CheckCastNode lowering
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11579
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125 condition = LogicNode.or(graph().unique(new IsNullNode(object)), typeTest, shortCircuitProbability);
10729
2a4ad6ab345e disabled new lowering of checkcast until performance regression is fixed
Doug Simon <doug.simon@oracle.com>
parents: 10712
diff changeset
126 }
10693
f8adf47cc05e checkcast is lowered to instanceof (GRAAL-248)
Doug Simon <doug.simon@oracle.com>
parents: 9786
diff changeset
127 }
11226
422b0e9b9aed removed obsolete checkcast snippets
Doug Simon <doug.simon@oracle.com>
parents: 10918
diff changeset
128 GuardingPiNode checkedObject = graph().add(new GuardingPiNode(object, condition, false, forStoreCheck ? ArrayStoreException : ClassCastException, InvalidateReprofile, stamp));
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parents: 10918
diff changeset
129 graph().replaceFixedWithFixed(this, checkedObject);
11798
2fbb9fd55dde made lowering recursive instead of iterative
Doug Simon <doug.simon@oracle.com>
parents: 11652
diff changeset
130 checkedObject.lower(tool);
5379
c862951e769d moved checkcast lowering into LoweringPhase and added -G:HIRLowerCheckcast option to enable it (disabled by default) as it is not yet stable
Doug Simon <doug.simon@oracle.com>
parents: 5372
diff changeset
131 }
c862951e769d moved checkcast lowering into LoweringPhase and added -G:HIRLowerCheckcast option to enable it (disabled by default) as it is not yet stable
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parents: 5372
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132
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parents: 5372
diff changeset
133 @Override
5831
ed08c40d67de Add a alwaysNull property to ObjectStamp (Phi(null, a! A) get a "a A" stamp and not just "a -")
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parents: 5720
diff changeset
134 public boolean inferStamp() {
15754
45285c8eccbd Never use the current node's stamp in ValueNode.inferStamp overrides.
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
diff changeset
135 if (object().stamp() instanceof ObjectStamp) {
45285c8eccbd Never use the current node's stamp in ValueNode.inferStamp overrides.
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
diff changeset
136 ObjectStamp castStamp = (ObjectStamp) StampFactory.declared(type);
45285c8eccbd Never use the current node's stamp in ValueNode.inferStamp overrides.
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
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137 return updateStamp(((ObjectStamp) object().stamp()).castTo(castStamp));
11265
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11226
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138 }
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11226
diff changeset
139 return false;
5831
ed08c40d67de Add a alwaysNull property to ObjectStamp (Phi(null, a! A) get a "a A" stamp and not just "a -")
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parents: 5720
diff changeset
140 }
ed08c40d67de Add a alwaysNull property to ObjectStamp (Phi(null, a! A) get a "a A" stamp and not just "a -")
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parents: 5720
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141
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parents: 5720
diff changeset
142 @Override
11880
9a747d8e0d0f broadened types in Canonicalizable interface so that it can be moved to the com.oracle.graal.graph project (GRAAL-506)
Doug Simon <doug.simon@oracle.com>
parents: 11839
diff changeset
143 public Node canonical(CanonicalizerTool tool) {
15260
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
diff changeset
144 ResolvedJavaType objectType = StampTool.typeOrNull(object());
9478
fb22b4d5f475 Allow distinction between ClassCastException and ArrayStoreException. Add more canonicalizations for check casts.
Christian Wimmer <christian.wimmer@oracle.com>
parents: 9251
diff changeset
145 if (objectType != null && type.isAssignableFrom(objectType)) {
fb22b4d5f475 Allow distinction between ClassCastException and ArrayStoreException. Add more canonicalizations for check casts.
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parents: 9251
diff changeset
146 // we don't have to check for null types here because they will also pass the
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Christian Wimmer <christian.wimmer@oracle.com>
parents: 9251
diff changeset
147 // checkcast.
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parents: 9251
diff changeset
148 return object();
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Christian Wimmer <christian.wimmer@oracle.com>
parents: 9251
diff changeset
149 }
9543
f8a5f7f7d0bd CheckCastNode: eliminate the other way around
Bernhard Urban <bernhard.urban@jku.at>
parents: 9494
diff changeset
150
16252
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
151 if (StampTool.isObjectAlwaysNull(object())) {
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parents: 15831
diff changeset
152 return object();
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
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parents: 15831
diff changeset
153 }
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
154
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
155 if (tool.assumptions() != null && tool.assumptions().useOptimisticAssumptions()) {
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
156 ResolvedJavaType exactType = type.findUniqueConcreteSubtype();
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
157 if (exactType != null && !exactType.equals(type)) {
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
158 // Propagate more precise type information to usages of the checkcast.
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
159 tool.assumptions().recordConcreteSubtype(type, exactType);
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
160 return new CheckCastNode(exactType, object, profile, forStoreCheck);
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
161 }
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
162 }
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
163
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
164 return this;
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
165 }
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
166
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
167 @Override
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
168 public void simplify(SimplifierTool tool) {
10918
3736fb3dcc56 checkcastnode: fix comment and scope in unittest
Bernhard Urban <bernhard.urban@jku.at>
parents: 10877
diff changeset
169 // if the previous node is also a checkcast, with a less precise and compatible type,
3736fb3dcc56 checkcastnode: fix comment and scope in unittest
Bernhard Urban <bernhard.urban@jku.at>
parents: 10877
diff changeset
170 // replace both with one checkcast checking the more specific type.
9543
f8a5f7f7d0bd CheckCastNode: eliminate the other way around
Bernhard Urban <bernhard.urban@jku.at>
parents: 9494
diff changeset
171 if (predecessor() instanceof CheckCastNode) {
f8a5f7f7d0bd CheckCastNode: eliminate the other way around
Bernhard Urban <bernhard.urban@jku.at>
parents: 9494
diff changeset
172 CheckCastNode ccn = (CheckCastNode) predecessor();
f8a5f7f7d0bd CheckCastNode: eliminate the other way around
Bernhard Urban <bernhard.urban@jku.at>
parents: 9494
diff changeset
173 if (ccn != null && ccn.type != null && ccn == object && ccn.forStoreCheck == forStoreCheck && ccn.type.isAssignableFrom(type)) {
9602
19c5a07c7843 Introduce a graph() method that returns a StructuredGraph, to make many explicit casts unnecessary
Christian Wimmer <christian.wimmer@oracle.com>
parents: 9543
diff changeset
174 StructuredGraph graph = ccn.graph();
9543
f8a5f7f7d0bd CheckCastNode: eliminate the other way around
Bernhard Urban <bernhard.urban@jku.at>
parents: 9494
diff changeset
175 CheckCastNode newccn = graph.add(new CheckCastNode(type, ccn.object, ccn.profile, ccn.forStoreCheck));
f8a5f7f7d0bd CheckCastNode: eliminate the other way around
Bernhard Urban <bernhard.urban@jku.at>
parents: 9494
diff changeset
176 graph.replaceFixedWithFixed(ccn, newccn);
16252
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
177 replaceAtUsages(newccn);
a762ddb12b43 change some node types from Canonicalizable to Simplifiable
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
178 graph.removeFixed(this);
5417
791eb4f85b29 Use exact type for check cast canonicalization if available
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 5379
diff changeset
179 }
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
180 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
181 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
182
5370
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
183 public ValueNode object() {
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
184 return object;
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
185 }
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
186
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
187 /**
6648
7bf5a6c42db7 factored CheckCastDynamicNode out of CheckCastNode
Doug Simon <doug.simon@oracle.com>
parents: 6462
diff changeset
188 * Gets the type being cast to.
5370
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
189 */
6648
7bf5a6c42db7 factored CheckCastDynamicNode out of CheckCastNode
Doug Simon <doug.simon@oracle.com>
parents: 6462
diff changeset
190 public ResolvedJavaType type() {
7bf5a6c42db7 factored CheckCastDynamicNode out of CheckCastNode
Doug Simon <doug.simon@oracle.com>
parents: 6462
diff changeset
191 return type;
5370
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
192 }
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
193
5541
b4c406861c33 More renamings to drop Ri* prefix completely. Deleted graph.BitMap class and replaced with java.util.BitSet.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 5540
diff changeset
194 public JavaTypeProfile profile() {
5370
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
195 return profile;
5229911d3970 removed TypeCheckNode
Doug Simon <doug.simon@oracle.com>
parents: 5369
diff changeset
196 }
6710
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6648
diff changeset
197
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6648
diff changeset
198 @Override
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6648
diff changeset
199 public void virtualize(VirtualizerTool tool) {
7394
94f032472c28 changed PEA interface:
Lukas Stadler <lukas.stadler@jku.at>
parents: 7337
diff changeset
200 State state = tool.getObjectState(object);
94f032472c28 changed PEA interface:
Lukas Stadler <lukas.stadler@jku.at>
parents: 7337
diff changeset
201 if (state != null && state.getState() == EscapeState.Virtual) {
8961
1b5eeb50e690 PEA: fix virtualization of CheckCastNode (check type)
Lukas Stadler <lukas.stadler@jku.at>
parents: 7530
diff changeset
202 if (type.isAssignableFrom(state.getVirtualObject().type())) {
1b5eeb50e690 PEA: fix virtualization of CheckCastNode (check type)
Lukas Stadler <lukas.stadler@jku.at>
parents: 7530
diff changeset
203 tool.replaceWithVirtual(state.getVirtualObject());
1b5eeb50e690 PEA: fix virtualization of CheckCastNode (check type)
Lukas Stadler <lukas.stadler@jku.at>
parents: 7530
diff changeset
204 }
6710
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6648
diff changeset
205 }
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6648
diff changeset
206 }
10762
c483912aaf70 add ValueProxy interface and infrastructure
Lukas Stadler <lukas.stadler@jku.at>
parents: 10730
diff changeset
207
c483912aaf70 add ValueProxy interface and infrastructure
Lukas Stadler <lukas.stadler@jku.at>
parents: 10730
diff changeset
208 @Override
15009
e49f62425090 introduce non-ValueNode Proxy interface
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15002
diff changeset
209 public ValueNode getOriginalNode() {
10762
c483912aaf70 add ValueProxy interface and infrastructure
Lukas Stadler <lukas.stadler@jku.at>
parents: 10730
diff changeset
210 return object;
c483912aaf70 add ValueProxy interface and infrastructure
Lukas Stadler <lukas.stadler@jku.at>
parents: 10730
diff changeset
211 }
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
212 }