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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/ir/LoadField.java @ 2947:e86e83c5adbc

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More on lowering.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Fri, 10 Jun 2011 21:51:42 +0200
parents cd4176d590e7
children 0c0e407faa39
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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.compiler.ir;
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24
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25 import com.oracle.max.graal.compiler.debug.*;
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26 import com.oracle.max.graal.compiler.graph.*;
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27 import com.oracle.max.graal.compiler.phases.CanonicalizerPhase.CanonicalizerOp;
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28 import com.oracle.max.graal.compiler.phases.LoweringPhase.LoweringOp;
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29 import com.oracle.max.graal.compiler.phases.LoweringPhase.LoweringTool;
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30 import com.oracle.max.graal.graph.*;
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31 import com.sun.cri.ci.*;
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32 import com.sun.cri.ri.*;
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33
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34 /**
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35 * The {@code LoadField} instruction represents a read of a static or instance field.
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36 */
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37 public final class LoadField extends AccessField {
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38 private static final LoadFieldCanonicalizerOp CANONICALIZER = new LoadFieldCanonicalizerOp();
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39
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40 private static final int INPUT_COUNT = 0;
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41 private static final int SUCCESSOR_COUNT = 0;
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42
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43 /**
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44 * Creates a new LoadField instance.
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45 * @param object the receiver object
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46 * @param field the compiler interface field
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47 * @param isStatic indicates if the field is static
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48 * @param stateAfter the state after the field access
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49 * @param graph
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50 * @param isLoaded indicates if the class is loaded
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51 */
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52 public LoadField(Value object, RiField field, Graph graph) {
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53 super(field.kind().stackKind(), object, field, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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54 }
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55
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56 /**
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57 * Gets the declared type of the field being accessed.
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58 * @return the declared type of the field being accessed.
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59 */
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60 @Override
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61 public RiType declaredType() {
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62 return field().type();
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63 }
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64
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65 /**
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66 * Gets the exact type of the field being accessed. If the field type is
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67 * a primitive array or an instance class and the class is loaded and final,
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68 * then the exact type is the same as the declared type. Otherwise it is {@code null}
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69 * @return the exact type of the field if known; {@code null} otherwise
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70 */
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71 @Override
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72 public RiType exactType() {
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73 RiType declared = declaredType();
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74 return declared != null && declared.isResolved() ? declared.exactType() : null;
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75 }
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76
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77 @Override
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78 public void accept(ValueVisitor v) {
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79 v.visitLoadField(this);
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80 }
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81
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82 @Override
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83 public void print(LogStream out) {
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84 out.print(object()).
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85 print(".").
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86 print(field.name()).
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87 print(" [field: ").
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88 print(CiUtil.format("%h.%n:%t", field, false)).
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89 print("]");
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90 }
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91
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92 @Override
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93 public boolean needsStateAfter() {
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94 return false;
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95 }
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96
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97 /**
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98 * Gets a constant value to which this load can be reduced.
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99 *
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100 * @return {@code null} if this load cannot be reduced to a constant
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101 */
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102 private CiConstant constantValue() {
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103 if (isStatic()) {
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104 return field.constantValue(null);
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105 } else if (object().isConstant()) {
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106 return field.constantValue(object().asConstant());
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107 }
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108 return null;
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109 }
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110
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111 @Override
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112 public Node copy(Graph into) {
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113 return new LoadField(null, field, into);
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114 }
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115
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116 @SuppressWarnings("unchecked")
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117 @Override
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118 public <T extends Op> T lookup(Class<T> clazz) {
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119 if (clazz == CanonicalizerOp.class) {
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120 return (T) CANONICALIZER;
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121 }
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122 return super.lookup(clazz);
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123 }
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124
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125 private static class LoadFieldLoweringOp implements LoweringOp {
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126
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127 @Override
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128 public Node lower(Node n, LoweringTool tool) {
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129 LoadField field = (LoadField) n;
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130 return null;//field.field().createLoad(tool);
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131 }
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132
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133 }
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134
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135 private static class LoadFieldCanonicalizerOp implements CanonicalizerOp {
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136 @Override
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137 public Node canonical(Node node) {
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138 LoadField loadField = (LoadField) node;
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139 Graph graph = node.graph();
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140 CiConstant constant = null;
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141 if (graph instanceof CompilerGraph) {
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142 RiMethod method = ((CompilerGraph) graph).getCompilation().method;
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143 if (loadField.isStatic() && !method.isClassInitializer()) {
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144 constant = loadField.field().constantValue(null);
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145 }
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146 }
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147 if (!loadField.isStatic()) {
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148 Value object = loadField.object();
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149 if (object.isConstant()) {
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150 constant = loadField.field().constantValue(object.asConstant());
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151 }
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152 }
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153 if (constant != null) {
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154 return new Constant(constant, graph);
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155 }
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156 return loadField;
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157 }
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158 }
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159 }