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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2540:3fc322165071

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More flags clean up.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 20:27:43 +0200
parents fa3bda50cbfd
children 0f9eeb15e636
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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 }