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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/PiNode.java @ 16811:5d468add216f

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added @NodeInfo annotations to all Node classes
author Doug Simon <doug.simon@oracle.com>
date Wed, 13 Aug 2014 18:25:45 +0200
parents 90b324f2bd66
children cbd42807a31f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2012, 2013, 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;
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24
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25 //JaCoCo Exclude
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26
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27 import com.oracle.graal.api.meta.*;
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28 import com.oracle.graal.compiler.common.type.*;
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29 import com.oracle.graal.graph.*;
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30 import com.oracle.graal.graph.spi.*;
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31 import com.oracle.graal.nodes.extended.*;
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32 import com.oracle.graal.nodes.spi.*;
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33 import com.oracle.graal.nodes.type.*;
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34
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35 /**
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36 * A node that changes the type of its input, usually narrowing it. For example, a PiNode refines
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37 * the type of a receiver during type-guarded inlining to be the type tested by the guard.
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38 *
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39 * In contrast to a {@link GuardedValueNode}, a PiNode is useless as soon as the type of its input
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40 * is as narrow or narrower than the PiNode's type. The PiNode, and therefore also the scheduling
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41 * restriction enforced by the anchor, will go away.
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42 */
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43 @NodeInfo
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44 public class PiNode extends FloatingGuardedNode implements LIRLowerable, Virtualizable, IterableNodeType, Canonicalizable, ValueProxy {
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45
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46 @Input private ValueNode object;
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47 private final Stamp piStamp;
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48
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49 public ValueNode object() {
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50 return object;
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51 }
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52
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53 public PiNode(ValueNode object, Stamp stamp) {
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54 super(stamp);
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55 this.piStamp = stamp;
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56 this.object = object;
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57 }
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58
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59 public PiNode(ValueNode object, Stamp stamp, ValueNode anchor) {
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60 super(stamp, (GuardingNode) anchor);
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61 this.object = object;
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62 this.piStamp = stamp;
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63 }
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64
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65 public PiNode(ValueNode object, ResolvedJavaType toType, boolean exactType, boolean nonNull) {
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66 this(object, StampFactory.object(toType, exactType, nonNull || StampTool.isObjectNonNull(object.stamp())));
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67 }
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68
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69 @Override
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70 public void generate(NodeLIRBuilderTool generator) {
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71 if (object.getKind() != Kind.Void && object.getKind() != Kind.Illegal) {
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72 generator.setResult(this, generator.operand(object));
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73 }
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74 }
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76 @Override
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77 public boolean inferStamp() {
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78 if (piStamp == StampFactory.forNodeIntrinsic()) {
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79 return false;
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80 }
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81 if (piStamp instanceof ObjectStamp && object.stamp() instanceof ObjectStamp) {
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82 return updateStamp(((ObjectStamp) object.stamp()).castTo((ObjectStamp) piStamp));
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83 }
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84 return updateStamp(piStamp.join(object().stamp()));
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85 }
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86
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87 @Override
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88 public void virtualize(VirtualizerTool tool) {
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89 State state = tool.getObjectState(object);
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90 if (state != null && state.getState() == EscapeState.Virtual && StampTool.typeOrNull(this) != null && StampTool.typeOrNull(this).isAssignableFrom(state.getVirtualObject().type())) {
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91 tool.replaceWithVirtual(state.getVirtualObject());
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92 }
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93 }
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94
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95 @Override
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96 public Node canonical(CanonicalizerTool tool) {
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97 if (stamp() == StampFactory.forNodeIntrinsic()) {
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98 /* The actual stamp has not been set yet. */
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99 return this;
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100 }
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101 inferStamp();
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102 if (stamp().equals(object().stamp())) {
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103 return object();
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104 }
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105 return this;
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106 }
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107
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108 @Override
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109 public ValueNode getOriginalNode() {
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110 return object;
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111 }
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112
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113 @NodeIntrinsic
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114 public static native <T> T piCast(Object object, @ConstantNodeParameter Stamp stamp);
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115
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116 @NodeIntrinsic
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117 public static native <T> T piCast(Object object, @ConstantNodeParameter Stamp stamp, GuardingNode anchor);
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118
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119 public static <T> T piCastExactNonNull(Object object, @ConstantNodeParameter Class<T> toType) {
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120 return piCast(object, toType, true, true);
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121 }
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122
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123 public static <T> T piCastExact(Object object, @ConstantNodeParameter Class<T> toType) {
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124 return piCast(object, toType, true, false);
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125 }
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126
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127 public static <T> T piCast(Object object, @ConstantNodeParameter Class<T> toType) {
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128 return piCast(object, toType, false, false);
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129 }
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130
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131 public static <T> T piCastNonNull(Object object, @ConstantNodeParameter Class<T> toType) {
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132 return piCast(object, toType, false, true);
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133 }
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134
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135 @SuppressWarnings("unused")
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136 @NodeIntrinsic
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137 private static <T> T piCast(Object object, @ConstantNodeParameter Class<T> toType, @ConstantNodeParameter boolean exactType, @ConstantNodeParameter boolean nonNull) {
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138 return toType.cast(object);
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139 }
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Lukas Stadler <lukas.stadler@jku.at>
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140 }