Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2538:e1ba5a93e997
Clean up on Value class and LIRGenerator/LIRItem-related things.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 20:13:54 +0200 |
parents | 4a016ff4d2df |
children | fa3bda50cbfd |
rev | line source |
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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 static com.sun.c1x.ir.Value.Flag.*; |
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26 |
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27 import com.sun.c1x.*; |
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28 import com.sun.c1x.debug.*; |
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29 import com.sun.c1x.opt.*; |
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30 import com.sun.cri.ci.*; |
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31 import com.sun.cri.ri.*; |
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32 |
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33 /** |
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34 * This class represents a value within the HIR graph, including local variables, phis, and |
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35 * all other instructions. |
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36 */ |
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37 public abstract class Value { |
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38 |
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39 public enum Flag { |
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40 NonNull, // this value is non-null |
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41 |
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42 NoNullCheck, // does not require null check |
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43 NoStoreCheck, // does not require store check |
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44 NoBoundsCheck, // does not require bounds check |
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45 NoZeroCheck, // divide or modulus cannot cause exception |
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46 |
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47 NoReadBarrier, // does not require read barrier |
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48 NoWriteBarrier, // does not require write barrier |
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49 IsLoaded, // field or method is resolved and class is loaded and initialized |
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50 NeedsPatching, |
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51 LiveValue, // live because value is used |
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52 LiveDeopt, // live for deoptimization |
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53 LiveControl, // live for control dependencies |
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54 LiveSideEffect, // live for possible side-effects only |
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55 LiveStore, // instruction is a store |
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56 PhiDead, // phi is illegal because local is dead |
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57 PhiCannotSimplify, // phi cannot be simplified |
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58 PhiVisited; // phi has been visited during simplification |
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59 |
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60 public final int mask = 1 << ordinal(); |
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61 } |
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62 |
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63 private static final int LIVE_FLAGS = Flag.LiveValue.mask | |
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64 Flag.LiveDeopt.mask | |
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65 Flag.LiveControl.mask | |
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66 Flag.LiveSideEffect.mask; |
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67 /** |
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68 * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value. |
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69 * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}. |
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70 */ |
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71 public final CiKind kind; |
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72 |
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73 /** |
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74 * Unique identifier for this value. This field's value is lazily initialized by {@link #id()}. |
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75 */ |
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76 private int id; |
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77 |
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78 /** |
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79 * A mask of {@linkplain Flag flags} denoting extra properties of this value. |
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80 */ |
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81 private int flags; |
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82 |
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83 protected CiValue operand = CiValue.IllegalValue; |
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84 |
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85 /** |
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86 * Used by {@link InstructionSubstituter}. |
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87 */ |
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88 public Value subst; |
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89 |
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90 public abstract BlockBegin block(); |
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91 |
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92 /** |
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93 * Creates a new value with the specified kind. |
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94 * @param kind the type of this value |
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95 */ |
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96 public Value(CiKind kind) { |
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97 assert kind == kind.stackKind() : kind + " != " + kind.stackKind(); |
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98 this.kind = kind; |
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99 } |
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100 |
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101 /** |
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102 * Checks whether this instruction is live (i.e. code should be generated for it). |
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103 * This is computed in a dedicated pass by {@link LivenessMarker}. |
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104 * An instruction is live because its value is needed by another live instruction, |
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105 * because its value is needed for deoptimization, or the program is control dependent |
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106 * upon it. |
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107 * @return {@code true} if this instruction should be considered live |
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108 */ |
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109 public final boolean isLive() { |
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110 return C1XOptions.PinAllInstructions || (flags & LIVE_FLAGS) != 0; |
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111 } |
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112 |
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113 /** |
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114 * Clears all liveness flags. |
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115 */ |
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116 public final void clearLive() { |
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117 flags = flags & ~LIVE_FLAGS; |
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118 } |
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119 |
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120 /** |
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121 * Gets the instruction that should be substituted for this one. Note that this |
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122 * method is recursive; if the substituted instruction has a substitution, then |
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123 * the final substituted instruction will be returned. If there is no substitution |
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124 * for this instruction, {@code this} will be returned. |
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125 * @return the substitution for this instruction |
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126 */ |
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127 public final Value subst() { |
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128 if (subst == null) { |
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129 return this; |
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130 } |
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131 return subst.subst(); |
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132 } |
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133 |
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134 /** |
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135 * Checks whether this instruction has a substitute. |
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136 * @return {@code true} if this instruction has a substitution. |
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137 */ |
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138 public final boolean hasSubst() { |
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139 return subst != null; |
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140 } |
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141 |
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142 /** |
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143 * Eliminates a given runtime check for this instruction. |
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144 * |
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145 * @param flag the flag representing the (elimination of the) runtime check |
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146 */ |
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147 public final void clearRuntimeCheck(Flag flag) { |
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148 if (!checkFlag(flag)) { |
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149 setFlag(flag); |
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150 runtimeCheckCleared(); |
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151 if (flag == NoNullCheck) { |
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152 C1XMetrics.NullCheckEliminations++; |
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153 } else if (flag == NoBoundsCheck) { |
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154 C1XMetrics.BoundsChecksElminations++; |
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155 } else if (flag == NoStoreCheck) { |
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156 C1XMetrics.StoreCheckEliminations++; |
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157 } else if (flag != NoZeroCheck) { |
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158 throw new InternalError("Unknown runtime check: " + flag); |
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159 } |
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160 } |
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161 } |
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162 |
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163 |
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164 /** |
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165 * Clear any internal state related to null checks, because a null check |
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166 * for this instruction is redundant. The state cleared may depend |
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167 * on the type of this instruction |
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168 */ |
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169 public final void eliminateNullCheck() { |
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170 clearRuntimeCheck(NoNullCheck); |
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171 } |
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172 |
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173 /** |
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174 * Notifies this instruction that a runtime check has been |
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175 * eliminated or made redundant. |
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176 */ |
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177 protected void runtimeCheckCleared() { |
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178 } |
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179 |
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180 /** |
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181 * Check whether this instruction has the specified flag set. |
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182 * @param flag the flag to test |
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183 * @return {@code true} if this instruction has the flag |
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184 */ |
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185 public final boolean checkFlag(Flag flag) { |
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186 return (flags & flag.mask) != 0; |
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187 } |
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188 |
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189 /** |
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190 * Set a flag on this instruction. |
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191 * @param flag the flag to set |
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192 */ |
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193 public final void setFlag(Flag flag) { |
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194 flags |= flag.mask; |
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195 } |
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196 |
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197 /** |
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198 * Clear a flag on this instruction. |
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199 * @param flag the flag to set |
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200 */ |
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201 public final void clearFlag(Flag flag) { |
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202 flags &= ~flag.mask; |
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203 } |
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204 |
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205 /** |
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206 * Set or clear a flag on this instruction. |
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207 * @param flag the flag to set |
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208 * @param val if {@code true}, set the flag, otherwise clear it |
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209 */ |
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210 public final void setFlag(Flag flag, boolean val) { |
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211 if (val) { |
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212 setFlag(flag); |
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213 } else { |
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214 clearFlag(flag); |
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215 } |
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216 } |
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217 |
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218 /** |
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219 * Initialize a flag on this instruction. Assumes the flag is not initially set, |
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220 * e.g. in the constructor of an instruction. |
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221 * @param flag the flag to set |
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222 * @param val if {@code true}, set the flag, otherwise do nothing |
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223 */ |
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224 public final void initFlag(Flag flag, boolean val) { |
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225 if (val) { |
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226 setFlag(flag); |
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227 } |
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228 } |
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229 |
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230 /** |
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231 * Checks whether this instruction produces a value which is guaranteed to be non-null. |
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232 * @return {@code true} if this instruction's value is not null |
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233 */ |
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234 public final boolean isNonNull() { |
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235 return checkFlag(Flag.NonNull); |
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236 } |
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237 |
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238 /** |
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239 * Checks whether this instruction needs a null check. |
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240 * @return {@code true} if this instruction needs a null check |
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241 */ |
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242 public final boolean needsNullCheck() { |
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243 return !checkFlag(Flag.NoNullCheck); |
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244 } |
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245 |
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246 /** |
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247 * Checks whether this value is a constant (i.e. it is of type {@link Constant}. |
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248 * @return {@code true} if this value is a constant |
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249 */ |
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250 public final boolean isConstant() { |
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251 return this instanceof Constant; |
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252 } |
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253 |
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254 /** |
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255 * Checks whether this value represents the null constant. |
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256 * @return {@code true} if this value represents the null constant |
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257 */ |
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258 public final boolean isNullConstant() { |
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259 return this instanceof Constant && ((Constant) this).value.isNull(); |
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260 } |
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261 |
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262 /** |
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263 * Checks whether this instruction "is illegal"--i.e. it represents a dead |
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264 * phi or an instruction which does not produce a value. |
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265 * @return {@code true} if this instruction is illegal as an input value to another instruction |
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266 */ |
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267 public final boolean isIllegal() { |
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268 return checkFlag(Flag.PhiDead); |
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269 } |
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270 |
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271 /** |
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272 * Convert this value to a constant if it is a constant, otherwise return null. |
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273 * @return the {@link CiConstant} represented by this value if it is a constant; {@code null} |
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274 * otherwise |
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275 */ |
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276 public final CiConstant asConstant() { |
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277 if (this instanceof Constant) { |
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278 return ((Constant) this).value; |
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279 } |
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280 return null; |
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281 } |
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282 |
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283 /** |
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284 * Gets the LIR operand associated with this instruction. |
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285 * @return the LIR operand for this instruction |
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286 */ |
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287 public final CiValue operand() { |
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288 return operand; |
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289 } |
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290 |
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291 /** |
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292 * Sets the LIR operand associated with this instruction. |
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293 * @param operand the operand to associate with this instruction |
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294 */ |
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295 public final void setOperand(CiValue operand) { |
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296 assert this.operand.isIllegal() : "operand cannot be set twice"; |
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297 assert operand != null && operand.isLegal() : "operand must be legal"; |
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298 assert operand.kind.stackKind() == this.kind; |
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299 this.operand = operand; |
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300 } |
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301 |
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302 /** |
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303 * Clears the LIR operand associated with this instruction. |
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304 */ |
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305 public final void clearOperand() { |
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306 this.operand = CiValue.IllegalValue; |
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307 } |
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308 |
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309 /** |
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310 * Computes the exact type of the result of this instruction, if possible. |
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311 * @return the exact type of the result of this instruction, if it is known; {@code null} otherwise |
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312 */ |
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313 public RiType exactType() { |
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314 return null; // default: unknown exact type |
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315 } |
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316 |
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317 /** |
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318 * Computes the declared type of the result of this instruction, if possible. |
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319 * @return the declared type of the result of this instruction, if it is known; {@code null} otherwise |
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320 */ |
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321 public RiType declaredType() { |
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322 return null; // default: unknown declared type |
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323 } |
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324 |
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325 /** |
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326 * Apply the specified closure to all the input values of this instruction. |
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327 * @param closure the closure to apply |
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328 */ |
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329 public void inputValuesDo(ValueClosure closure) { |
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330 // default: do nothing. |
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331 } |
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332 |
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333 @Override |
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334 public String toString() { |
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335 StringBuilder builder = new StringBuilder(); |
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336 builder.append(getClass().getSimpleName()); |
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337 builder.append(" #"); |
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338 builder.append(id()); |
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339 if (this instanceof Instruction) { |
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340 builder.append(" @ "); |
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341 builder.append(((Instruction) this).bci()); |
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342 } |
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343 builder.append(" [").append(flagsToString()).append("]"); |
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344 return builder.toString(); |
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345 } |
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346 |
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347 public String flagsToString() { |
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348 StringBuilder sb = new StringBuilder(); |
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349 for (Flag f : Flag.values()) { |
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350 if (checkFlag(f)) { |
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351 if (sb.length() != 0) { |
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352 sb.append(' '); |
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353 } |
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354 sb.append(f.name()); |
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355 } |
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356 } |
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357 return sb.toString(); |
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358 } |
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359 |
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360 public final boolean isDeadPhi() { |
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361 return checkFlag(Flag.PhiDead); |
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362 } |
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363 |
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364 /** |
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365 * This method supports the visitor pattern by accepting a visitor and calling the |
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366 * appropriate {@code visit()} method. |
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367 * |
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368 * @param v the visitor to accept |
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369 */ |
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370 public abstract void accept(ValueVisitor v); |
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371 |
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372 public abstract void print(LogStream out); |
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373 |
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374 /** |
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375 * This method returns a unique identification number for this value. The number returned is unique |
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376 * only to the compilation that produced this node and is computed lazily by using the current compilation |
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377 * for the current thread. Thus the first access is a hash lookup using {@link java.lang.ThreadLocal} and |
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378 * should not be considered fast. Because of the potentially slow first access, use of this ID should be |
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379 * restricted to debugging output. |
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380 * @return a unique ID for this value |
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381 */ |
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382 public int id() { |
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383 if (id == 0) { |
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384 C1XMetrics.UniqueValueIdsAssigned++; |
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385 id = C1XCompilation.compilation().nextID(); |
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386 } |
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387 return id; |
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9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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389 } |