Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2540:3fc322165071
More flags clean up.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 20:27:43 +0200 |
parents | fa3bda50cbfd |
children | 0f9eeb15e636 |
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 LiveValue, // live because value is used |
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50 LiveDeopt, // live for deoptimization |
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51 LiveSideEffect, // live for possible side-effects only |
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52 PhiDead, // phi is illegal because local is dead |
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53 PhiCannotSimplify, // phi cannot be simplified |
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54 PhiVisited; // phi has been visited during simplification |
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55 |
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56 public final int mask = 1 << ordinal(); |
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57 } |
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58 |
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59 private static final int LIVE_FLAGS = Flag.LiveValue.mask | |
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60 Flag.LiveDeopt.mask | |
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61 Flag.LiveSideEffect.mask; |
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62 /** |
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63 * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value. |
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64 * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}. |
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65 */ |
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66 public final CiKind kind; |
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67 |
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68 /** |
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69 * Unique identifier for this value. This field's value is lazily initialized by {@link #id()}. |
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70 */ |
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71 private int id; |
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72 |
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73 /** |
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74 * A mask of {@linkplain Flag flags} denoting extra properties of this value. |
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75 */ |
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76 private int flags; |
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77 |
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78 protected CiValue operand = CiValue.IllegalValue; |
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79 |
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80 /** |
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81 * Used by {@link InstructionSubstituter}. |
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82 */ |
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83 public Value subst; |
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84 |
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85 public abstract BlockBegin block(); |
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86 |
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87 /** |
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88 * Creates a new value with the specified kind. |
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89 * @param kind the type of this value |
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90 */ |
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91 public Value(CiKind kind) { |
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92 assert kind == kind.stackKind() : kind + " != " + kind.stackKind(); |
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93 this.kind = kind; |
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94 } |
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95 |
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96 /** |
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97 * Checks whether this instruction is live (i.e. code should be generated for it). |
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98 * This is computed in a dedicated pass by {@link LivenessMarker}. |
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99 * An instruction is live because its value is needed by another live instruction, |
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100 * because its value is needed for deoptimization, or the program is control dependent |
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101 * upon it. |
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102 * @return {@code true} if this instruction should be considered live |
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103 */ |
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104 public final boolean isLive() { |
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105 return C1XOptions.PinAllInstructions || (flags & LIVE_FLAGS) != 0; |
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106 } |
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107 |
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108 /** |
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109 * Clears all liveness flags. |
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110 */ |
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111 public final void clearLive() { |
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112 flags = flags & ~LIVE_FLAGS; |
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113 } |
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114 |
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115 /** |
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116 * Gets the instruction that should be substituted for this one. Note that this |
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117 * method is recursive; if the substituted instruction has a substitution, then |
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118 * the final substituted instruction will be returned. If there is no substitution |
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119 * for this instruction, {@code this} will be returned. |
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120 * @return the substitution for this instruction |
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121 */ |
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122 public final Value subst() { |
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123 if (subst == null) { |
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124 return this; |
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125 } |
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126 return subst.subst(); |
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127 } |
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128 |
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129 /** |
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130 * Checks whether this instruction has a substitute. |
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131 * @return {@code true} if this instruction has a substitution. |
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132 */ |
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133 public final boolean hasSubst() { |
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134 return subst != null; |
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135 } |
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136 |
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137 /** |
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138 * Eliminates a given runtime check for this instruction. |
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139 * |
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140 * @param flag the flag representing the (elimination of the) runtime check |
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141 */ |
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142 public final void clearRuntimeCheck(Flag flag) { |
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143 if (!checkFlag(flag)) { |
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144 setFlag(flag); |
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145 runtimeCheckCleared(); |
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146 if (flag == NoNullCheck) { |
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147 C1XMetrics.NullCheckEliminations++; |
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148 } else if (flag == NoBoundsCheck) { |
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149 C1XMetrics.BoundsChecksElminations++; |
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150 } else if (flag == NoStoreCheck) { |
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151 C1XMetrics.StoreCheckEliminations++; |
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152 } else if (flag != NoZeroCheck) { |
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153 throw new InternalError("Unknown runtime check: " + flag); |
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154 } |
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155 } |
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156 } |
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157 |
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158 |
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159 /** |
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160 * Clear any internal state related to null checks, because a null check |
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161 * for this instruction is redundant. The state cleared may depend |
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162 * on the type of this instruction |
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163 */ |
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164 public final void eliminateNullCheck() { |
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165 clearRuntimeCheck(NoNullCheck); |
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166 } |
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167 |
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168 /** |
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169 * Notifies this instruction that a runtime check has been |
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170 * eliminated or made redundant. |
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171 */ |
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172 protected void runtimeCheckCleared() { |
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173 } |
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174 |
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175 /** |
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176 * Check whether this instruction has the specified flag set. |
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177 * @param flag the flag to test |
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178 * @return {@code true} if this instruction has the flag |
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179 */ |
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180 public final boolean checkFlag(Flag flag) { |
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181 return (flags & flag.mask) != 0; |
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182 } |
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183 |
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184 /** |
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185 * Set a flag on this instruction. |
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186 * @param flag the flag to set |
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187 */ |
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188 public final void setFlag(Flag flag) { |
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189 flags |= flag.mask; |
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190 } |
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191 |
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192 /** |
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193 * Clear a flag on this instruction. |
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194 * @param flag the flag to set |
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195 */ |
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196 public final void clearFlag(Flag flag) { |
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197 flags &= ~flag.mask; |
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198 } |
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199 |
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200 /** |
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201 * Set or clear a flag on this instruction. |
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202 * @param flag the flag to set |
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203 * @param val if {@code true}, set the flag, otherwise clear it |
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204 */ |
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205 public final void setFlag(Flag flag, boolean val) { |
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206 if (val) { |
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207 setFlag(flag); |
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208 } else { |
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209 clearFlag(flag); |
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210 } |
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211 } |
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212 |
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213 /** |
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214 * Initialize a flag on this instruction. Assumes the flag is not initially set, |
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215 * e.g. in the constructor of an instruction. |
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216 * @param flag the flag to set |
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217 * @param val if {@code true}, set the flag, otherwise do nothing |
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218 */ |
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219 public final void initFlag(Flag flag, boolean val) { |
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220 if (val) { |
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221 setFlag(flag); |
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222 } |
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223 } |
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224 |
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225 /** |
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226 * Checks whether this instruction produces a value which is guaranteed to be non-null. |
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227 * @return {@code true} if this instruction's value is not null |
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228 */ |
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229 public final boolean isNonNull() { |
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230 return checkFlag(Flag.NonNull); |
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231 } |
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232 |
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233 /** |
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234 * Checks whether this instruction needs a null check. |
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235 * @return {@code true} if this instruction needs a null check |
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236 */ |
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237 public final boolean needsNullCheck() { |
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238 return !checkFlag(Flag.NoNullCheck); |
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239 } |
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240 |
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241 /** |
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242 * Checks whether this value is a constant (i.e. it is of type {@link Constant}. |
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243 * @return {@code true} if this value is a constant |
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244 */ |
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245 public final boolean isConstant() { |
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246 return this instanceof Constant; |
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247 } |
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248 |
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249 /** |
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250 * Checks whether this value represents the null constant. |
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251 * @return {@code true} if this value represents the null constant |
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252 */ |
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253 public final boolean isNullConstant() { |
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254 return this instanceof Constant && ((Constant) this).value.isNull(); |
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255 } |
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256 |
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257 /** |
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258 * Checks whether this instruction "is illegal"--i.e. it represents a dead |
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259 * phi or an instruction which does not produce a value. |
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260 * @return {@code true} if this instruction is illegal as an input value to another instruction |
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261 */ |
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262 public final boolean isIllegal() { |
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263 return checkFlag(Flag.PhiDead); |
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264 } |
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265 |
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266 /** |
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267 * Convert this value to a constant if it is a constant, otherwise return null. |
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268 * @return the {@link CiConstant} represented by this value if it is a constant; {@code null} |
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269 * otherwise |
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270 */ |
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271 public final CiConstant asConstant() { |
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272 if (this instanceof Constant) { |
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273 return ((Constant) this).value; |
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274 } |
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275 return null; |
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276 } |
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277 |
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278 /** |
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279 * Gets the LIR operand associated with this instruction. |
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280 * @return the LIR operand for this instruction |
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281 */ |
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282 public final CiValue operand() { |
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283 return operand; |
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284 } |
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285 |
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286 /** |
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287 * Sets the LIR operand associated with this instruction. |
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288 * @param operand the operand to associate with this instruction |
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289 */ |
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290 public final void setOperand(CiValue operand) { |
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291 assert this.operand.isIllegal() : "operand cannot be set twice"; |
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292 assert operand != null && operand.isLegal() : "operand must be legal"; |
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293 assert operand.kind.stackKind() == this.kind; |
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294 this.operand = operand; |
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295 } |
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296 |
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297 /** |
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298 * Clears the LIR operand associated with this instruction. |
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299 */ |
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300 public final void clearOperand() { |
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301 this.operand = CiValue.IllegalValue; |
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302 } |
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303 |
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304 /** |
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305 * Computes the exact type of the result of this instruction, if possible. |
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306 * @return the exact type of the result of this instruction, if it is known; {@code null} otherwise |
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307 */ |
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308 public RiType exactType() { |
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309 return null; // default: unknown exact type |
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310 } |
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311 |
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312 /** |
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313 * Computes the declared type of the result of this instruction, if possible. |
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314 * @return the declared type of the result of this instruction, if it is known; {@code null} otherwise |
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315 */ |
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316 public RiType declaredType() { |
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317 return null; // default: unknown declared type |
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318 } |
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319 |
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320 /** |
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321 * Apply the specified closure to all the input values of this instruction. |
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322 * @param closure the closure to apply |
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323 */ |
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324 public void inputValuesDo(ValueClosure closure) { |
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325 // default: do nothing. |
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326 } |
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327 |
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328 @Override |
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329 public String toString() { |
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330 StringBuilder builder = new StringBuilder(); |
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331 builder.append(getClass().getSimpleName()); |
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332 builder.append(" #"); |
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333 builder.append(id()); |
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334 if (this instanceof Instruction) { |
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335 builder.append(" @ "); |
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336 builder.append(((Instruction) this).bci()); |
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337 } |
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338 builder.append(" [").append(flagsToString()).append("]"); |
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339 return builder.toString(); |
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340 } |
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341 |
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342 public String flagsToString() { |
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343 StringBuilder sb = new StringBuilder(); |
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344 for (Flag f : Flag.values()) { |
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345 if (checkFlag(f)) { |
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346 if (sb.length() != 0) { |
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347 sb.append(' '); |
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348 } |
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349 sb.append(f.name()); |
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350 } |
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351 } |
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352 return sb.toString(); |
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353 } |
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354 |
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355 public final boolean isDeadPhi() { |
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356 return checkFlag(Flag.PhiDead); |
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357 } |
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358 |
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359 /** |
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360 * This method supports the visitor pattern by accepting a visitor and calling the |
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361 * appropriate {@code visit()} method. |
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362 * |
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363 * @param v the visitor to accept |
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364 */ |
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365 public abstract void accept(ValueVisitor v); |
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366 |
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367 public abstract void print(LogStream out); |
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368 |
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369 /** |
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370 * This method returns a unique identification number for this value. The number returned is unique |
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371 * only to the compilation that produced this node and is computed lazily by using the current compilation |
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372 * for the current thread. Thus the first access is a hash lookup using {@link java.lang.ThreadLocal} and |
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373 * should not be considered fast. Because of the potentially slow first access, use of this ID should be |
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374 * restricted to debugging output. |
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375 * @return a unique ID for this value |
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376 */ |
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377 public int id() { |
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378 if (id == 0) { |
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379 C1XMetrics.UniqueValueIdsAssigned++; |
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380 id = C1XCompilation.compilation().nextID(); |
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381 } |
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382 return id; |
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383 } |
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384 } |