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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2623:b129b7da1397

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Some fixes around LIRGenerator / frame state. New option C1X:TraceLIRGeneratorLevel
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Tue, 10 May 2011 14:34:03 +0200
parents 01c5c0443158
children 0f69be73d5ce
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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.sun.c1x.ir;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.opt.*;
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28 import com.sun.cri.ci.*;
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29 import com.sun.cri.ri.*;
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30
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31 /**
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32 * This class represents a value within the HIR graph, including local variables, phis, and
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33 * all other instructions.
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34 */
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35 public abstract class Value extends Node {
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36
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37 public enum Flag {
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38 NonNull, // this value is non-null
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39
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40 PhiDead, // phi is illegal because local is dead
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41 PhiCannotSimplify, // phi cannot be simplified
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42 PhiVisited; // phi has been visited during simplification
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43
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44 public final int mask = 1 << ordinal();
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45 }
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46
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47 /**
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48 * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value.
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49 * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}.
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50 */
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51 public final CiKind kind;
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52
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53 /**
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54 * A mask of {@linkplain Flag flags} denoting extra properties of this value.
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55 */
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56 private int flags;
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57
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58 protected CiValue operand = CiValue.IllegalValue;
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59
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60 /**
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61 * Used by {@link InstructionSubstituter}.
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62 */
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63 public Value subst;
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64
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65 public abstract BlockBegin block();
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66
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67 /**
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68 * Creates a new value with the specified kind.
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69 * @param kind the type of this value
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70 * @param inputCount
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71 * @param successorCount
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72 * @param graph
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73 */
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74 public Value(CiKind kind, int inputCount, int successorCount, Graph graph) {
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75 super(inputCount, successorCount, graph);
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76 assert kind == kind.stackKind() : kind + " != " + kind.stackKind();
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77 this.kind = kind;
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78 }
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79
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80 ///////////////
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81 // TODO: remove when Value class changes are completed
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82
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83 @Override
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84 public Node copy(Graph into) {
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85 throw new UnsupportedOperationException();
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86 }
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87
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88 @Override
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89 protected Object clone() throws CloneNotSupportedException {
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90 throw new CloneNotSupportedException();
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91 }
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92
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93 /////////////////
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94
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95 /**
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96 * Gets the instruction that should be substituted for this one. Note that this
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97 * method is recursive; if the substituted instruction has a substitution, then
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98 * the final substituted instruction will be returned. If there is no substitution
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99 * for this instruction, {@code this} will be returned.
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100 * @return the substitution for this instruction
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101 */
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102 public final Value subst() {
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103 if (subst == null) {
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104 return this;
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105 }
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106 return subst.subst();
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107 }
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108
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109 /**
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110 * Checks whether this instruction has a substitute.
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111 * @return {@code true} if this instruction has a substitution.
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112 */
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113 public final boolean hasSubst() {
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114 return subst != null;
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115 }
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116
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117 /**
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118 * Check whether this instruction has the specified flag set.
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119 * @param flag the flag to test
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120 * @return {@code true} if this instruction has the flag
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121 */
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122 public final boolean checkFlag(Flag flag) {
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123 return (flags & flag.mask) != 0;
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124 }
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125
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126 /**
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127 * Set a flag on this instruction.
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128 * @param flag the flag to set
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129 */
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130 public final void setFlag(Flag flag) {
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131 flags |= flag.mask;
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132 }
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133
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134 /**
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135 * Clear a flag on this instruction.
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136 * @param flag the flag to set
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137 */
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138 public final void clearFlag(Flag flag) {
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139 flags &= ~flag.mask;
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140 }
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141
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142 /**
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143 * Set or clear a flag on this instruction.
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144 * @param flag the flag to set
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145 * @param val if {@code true}, set the flag, otherwise clear it
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146 */
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147 public final void setFlag(Flag flag, boolean val) {
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148 if (val) {
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149 setFlag(flag);
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150 } else {
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151 clearFlag(flag);
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152 }
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153 }
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154
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155 /**
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156 * Initialize a flag on this instruction. Assumes the flag is not initially set,
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157 * e.g. in the constructor of an instruction.
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158 * @param flag the flag to set
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159 * @param val if {@code true}, set the flag, otherwise do nothing
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160 */
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161 public final void initFlag(Flag flag, boolean val) {
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162 if (val) {
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163 setFlag(flag);
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164 }
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165 }
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166
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167 /**
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168 * Checks whether this instruction produces a value which is guaranteed to be non-null.
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169 * @return {@code true} if this instruction's value is not null
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170 */
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171 public final boolean isNonNull() {
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172 return checkFlag(Flag.NonNull);
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173 }
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174
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175 /**
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176 * Checks whether this value is a constant (i.e. it is of type {@link Constant}.
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177 * @return {@code true} if this value is a constant
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178 */
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179 public final boolean isConstant() {
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180 return this instanceof Constant;
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181 }
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182
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183 /**
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184 * Tests whether this instruction can trap. This is conservative; it does not take
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185 * into account analysis results that may eliminate the possibility of this
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186 * instruction from trapping.
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187 *
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188 * @return {@code true} if this instruction can cause a trap.
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189 */
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190 public boolean canTrap() {
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191 return false;
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192 }
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193
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194 /**
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195 * Checks whether this value represents the null constant.
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196 * @return {@code true} if this value represents the null constant
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197 */
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198 public final boolean isNullConstant() {
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199 return this instanceof Constant && ((Constant) this).value.isNull();
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200 }
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201
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202 /**
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203 * Checks whether this instruction "is illegal"--i.e. it represents a dead
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204 * phi or an instruction which does not produce a value.
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205 * @return {@code true} if this instruction is illegal as an input value to another instruction
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206 */
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207 public final boolean isIllegal() {
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208 return checkFlag(Flag.PhiDead);
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209 }
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210
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211 /**
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212 * Convert this value to a constant if it is a constant, otherwise return null.
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213 * @return the {@link CiConstant} represented by this value if it is a constant; {@code null}
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214 * otherwise
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215 */
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216 public final CiConstant asConstant() {
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217 if (this instanceof Constant) {
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218 return ((Constant) this).value;
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219 }
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220 return null;
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221 }
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222
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223 /**
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224 * Gets the LIR operand associated with this instruction.
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225 * @return the LIR operand for this instruction
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226 */
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227 public final CiValue operand() {
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228 return operand;
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229 }
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230
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231 /**
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232 * Sets the LIR operand associated with this instruction.
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233 * @param operand the operand to associate with this instruction
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234 */
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235 public final void setOperand(CiValue operand) {
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236 assert this.operand.isIllegal() : "operand cannot be set twice";
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237 assert operand != null && operand.isLegal() : "operand must be legal";
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238 assert operand.kind.stackKind() == this.kind;
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239 this.operand = operand;
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240 }
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241
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242 /**
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243 * Clears the LIR operand associated with this instruction.
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244 */
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245 public final void clearOperand() {
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246 this.operand = CiValue.IllegalValue;
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247 }
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248
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249 /**
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250 * Computes the exact type of the result of this instruction, if possible.
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251 * @return the exact type of the result of this instruction, if it is known; {@code null} otherwise
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252 */
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253 public RiType exactType() {
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254 return null; // default: unknown exact type
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255 }
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256
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257 /**
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258 * Computes the declared type of the result of this instruction, if possible.
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259 * @return the declared type of the result of this instruction, if it is known; {@code null} otherwise
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260 */
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261 public RiType declaredType() {
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262 return null; // default: unknown declared type
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263 }
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264
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265 /**
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266 * Apply the specified closure to all the input values of this instruction.
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267 * @param closure the closure to apply
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268 */
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269 public void inputValuesDo(ValueClosure closure) {
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270 for (int i = 0; i < inputs().size(); i++) {
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271 inputs().set(i, closure.apply((Value) inputs().get(i)));
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272 }
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273 }
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274
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275 @Override
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276 public String toString() {
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277 StringBuilder builder = new StringBuilder();
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278 builder.append("#");
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279 builder.append(id());
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280 builder.append(' ');
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281 if (id() < 10) {
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282 builder.append(' ');
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283 }
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284 builder.append(getClass().getSimpleName());
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285 if (this instanceof Instruction) {
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286 builder.append(" @ ");
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287 builder.append(((Instruction) this).bci());
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288 }
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289 builder.append(" [").append(flagsToString()).append("]");
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290 return builder.toString();
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291 }
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292
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293 public String flagsToString() {
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294 StringBuilder sb = new StringBuilder();
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295 for (Flag f : Flag.values()) {
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296 if (checkFlag(f)) {
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297 if (sb.length() != 0) {
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298 sb.append(' ');
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299 }
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300 sb.append(f.name());
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301 }
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302 }
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303 return sb.toString();
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304 }
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305
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306 public final boolean isDeadPhi() {
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307 return checkFlag(Flag.PhiDead);
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308 }
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309
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310 /**
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311 * This method supports the visitor pattern by accepting a visitor and calling the
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312 * appropriate {@code visit()} method.
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313 *
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314 * @param v the visitor to accept
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315 */
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316 public abstract void accept(ValueVisitor v);
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317
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318 public abstract void print(LogStream out);
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319
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320 }