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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/ValueNode.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 882f4cb7cfcf
children cbd42807a31f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 2011, 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 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.compiler.common.type.*;
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27 import com.oracle.graal.graph.*;
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28 import com.oracle.graal.graph.iterators.*;
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29
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30 /**
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31 * This class represents a value within the graph, including local variables, phis, and all other
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32 * instructions.
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33 */
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34 @NodeInfo
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35 public abstract class ValueNode extends ScheduledNode implements StampProvider, KindProvider {
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36
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37 /**
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38 * The kind of this value. This is {@link Kind#Void} for instructions that produce no value.
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39 * This kind is guaranteed to be a {@linkplain Kind#getStackKind() stack kind}.
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40 */
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41 private Stamp stamp;
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42
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43 public ValueNode(Stamp stamp) {
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44 this.stamp = stamp;
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45 }
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46
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47 public final Stamp stamp() {
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48 return stamp;
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49 }
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50
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51 public void setStamp(Stamp stamp) {
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52 this.stamp = stamp;
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53 }
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54
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55 /**
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56 * Checks if the given stamp is different than the current one (
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57 * {@code newStamp.equals(oldStamp) == false}). If it is different then the new stamp will
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58 * become the current stamp for this node.
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59 *
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60 * @return true if the stamp has changed, false otherwise.
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61 */
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62 protected final boolean updateStamp(Stamp newStamp) {
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63 if (newStamp == null || newStamp.equals(stamp)) {
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64 return false;
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65 } else {
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66 stamp = newStamp;
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67 return true;
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68 }
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69 }
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70
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71 /**
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72 * This method can be overridden by subclasses of {@link ValueNode} if they need to recompute
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73 * their stamp if their inputs change. A typical implementation will compute the stamp and pass
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74 * it to {@link #updateStamp(Stamp)}, whose return value can be used as the result of this
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75 * method.
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76 *
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77 * @return true if the stamp has changed, false otherwise.
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78 */
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79 public boolean inferStamp() {
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80 return false;
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81 }
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82
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83 public final Kind getKind() {
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84 return stamp().getStackKind();
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85 }
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86
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87 /**
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88 * Checks whether this value is a constant (i.e. it is of type {@link ConstantNode}.
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89 *
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90 * @return {@code true} if this value is a constant
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91 */
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92 public final boolean isConstant() {
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93 return this instanceof ConstantNode;
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94 }
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95
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96 private static final NodePredicate IS_CONSTANT = node -> node instanceof ConstantNode;
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97
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98 public static NodePredicate isConstantPredicate() {
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99 return IS_CONSTANT;
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100 }
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101
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102 /**
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103 * Checks whether this value represents the null constant.
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104 *
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105 * @return {@code true} if this value represents the null constant
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106 */
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107 public final boolean isNullConstant() {
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108 return this instanceof ConstantNode && ((ConstantNode) this).getValue().isNull();
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109 }
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110
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111 /**
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112 * Convert this value to a constant if it is a constant, otherwise return null.
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113 *
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114 * @return the {@link Constant} represented by this value if it is a constant; {@code null}
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115 * otherwise
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116 */
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117 public final Constant asConstant() {
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118 if (this instanceof ConstantNode) {
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119 return ((ConstantNode) this).getValue();
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120 }
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121 return null;
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122 }
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123
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124 public ValueNode asNode() {
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125 return this;
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126 }
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127
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128 @Override
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129 public boolean isAllowedUsageType(InputType type) {
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130 if (getKind() != Kind.Void && type == InputType.Value) {
15002
06e50d290784 isAllowedUsageType on Nodes
Lukas Stadler <lukas.stadler@oracle.com>
parents: 14928
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131 return true;
06e50d290784 isAllowedUsageType on Nodes
Lukas Stadler <lukas.stadler@oracle.com>
parents: 14928
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132 } else {
06e50d290784 isAllowedUsageType on Nodes
Lukas Stadler <lukas.stadler@oracle.com>
parents: 14928
diff changeset
133 return super.isAllowedUsageType(type);
06e50d290784 isAllowedUsageType on Nodes
Lukas Stadler <lukas.stadler@oracle.com>
parents: 14928
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134 }
06e50d290784 isAllowedUsageType on Nodes
Lukas Stadler <lukas.stadler@oracle.com>
parents: 14928
diff changeset
135 }
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
136 }