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annotate graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/ValueNode.java @ 4199:aaac4894175c

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Renamed cri packages from sun to oracle.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Tue, 03 Jan 2012 16:29:28 +0100
parents e233f5660da4
children 75dcf829cfdc
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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.max.graal.nodes;
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24
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25 import com.oracle.max.cri.ci.*;
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26 import com.oracle.max.cri.ri.*;
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27 import com.oracle.max.graal.graph.*;
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28 import com.oracle.max.graal.nodes.type.*;
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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
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32 * all other instructions.
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33 */
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34 public abstract class ValueNode extends Node implements StampProvider {
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35
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36 /**
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37 * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value.
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38 * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}.
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39 */
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40 @Data private Stamp stamp;
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41
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42 /**
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43 * Creates a new value with the specified kind.
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44 * @param kind the type of this value
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45 * @param inputCount
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46 * @param successorCount
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47 * @param graph
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48 */
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49 public ValueNode(Stamp stamp) {
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50 this.stamp = stamp;
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51 assert kind() != null && kind() == kind().stackKind() : kind() + " != " + kind().stackKind();
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52 }
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53
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54 public Stamp stamp() {
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55 return stamp;
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56 }
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57
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58 public void setStamp(Stamp stamp) {
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59 this.stamp = stamp;
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60 }
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61
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62 public CiKind kind() {
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63 return stamp.kind();
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64 }
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65
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66 /**
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67 * Checks whether this value is a constant (i.e. it is of type {@link ConstantNode}.
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68 * @return {@code true} if this value is a constant
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69 */
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70 public final boolean isConstant() {
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71 return this instanceof ConstantNode;
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72 }
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73
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74 /**
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75 * Checks whether this value represents the null constant.
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76 * @return {@code true} if this value represents the null constant
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77 */
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78 public final boolean isNullConstant() {
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79 return this instanceof ConstantNode && ((ConstantNode) this).value.isNull();
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80 }
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81
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82 /**
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83 * Convert this value to a constant if it is a constant, otherwise return null.
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84 * @return the {@link CiConstant} represented by this value if it is a constant; {@code null}
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85 * otherwise
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86 */
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87 public final CiConstant asConstant() {
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88 if (this instanceof ConstantNode) {
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89 return ((ConstantNode) this).value;
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90 }
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91 return null;
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92 }
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93
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94 /**
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95 * Computes the exact type of the result of this node, if possible.
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96 * @return the exact type of the result of this node, if it is known; {@code null} otherwise
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97 */
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98 public final RiResolvedType exactType() {
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99 return stamp.exactType();
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100 }
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101
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102 /**
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103 * Computes the declared type of the result of this node, if possible.
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104 * @return the declared type of the result of this node, if it is known; {@code null} otherwise
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105 */
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106 public final RiResolvedType declaredType() {
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107 return stamp.declaredType();
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108 }
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109 }