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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2565:cc1f1d396288

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Remove inlining (3rd part)
author Gilles Duboscq <gilles.duboscq@oracle.com>
date Fri, 29 Apr 2011 16:46:30 +0200
parents e1b3db8031ee
children 4a36a0bd6d18
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.c1x.ir;
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24
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25 import com.sun.c1x.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.opt.*;
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28 import com.sun.cri.ci.*;
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29 import com.sun.cri.ri.*;
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30
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31 /**
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32 * This class represents a value within the HIR graph, including local variables, phis, and
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33 * all other instructions.
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34 */
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35 public abstract class Value {
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36
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37 public enum Flag {
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38 NonNull, // this value is non-null
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39
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40 PhiDead, // phi is illegal because local is dead
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41 PhiCannotSimplify, // phi cannot be simplified
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42 PhiVisited; // phi has been visited during simplification
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43
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44 public final int mask = 1 << ordinal();
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45 }
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46
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47 /**
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48 * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value.
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49 * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}.
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50 */
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51 public final CiKind kind;
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52
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53 /**
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54 * Unique identifier for this value. This field's value is lazily initialized by {@link #id()}.
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55 */
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56 private int id;
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57
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58 /**
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59 * A mask of {@linkplain Flag flags} denoting extra properties of this value.
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60 */
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61 private int flags;
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62
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63 protected CiValue operand = CiValue.IllegalValue;
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64
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65 /**
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66 * Used by {@link InstructionSubstituter}.
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67 */
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68 public Value subst;
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69
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70 public abstract BlockBegin block();
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71
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72 /**
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73 * Creates a new value with the specified kind.
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74 * @param kind the type of this value
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75 */
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76 public Value(CiKind kind) {
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77 assert kind == kind.stackKind() : kind + " != " + kind.stackKind();
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78 this.kind = kind;
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79 }
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80
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81 /**
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82 * Gets the instruction that should be substituted for this one. Note that this
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83 * method is recursive; if the substituted instruction has a substitution, then
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84 * the final substituted instruction will be returned. If there is no substitution
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85 * for this instruction, {@code this} will be returned.
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86 * @return the substitution for this instruction
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87 */
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88 public final Value subst() {
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89 if (subst == null) {
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90 return this;
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91 }
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92 return subst.subst();
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93 }
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94
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95 /**
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96 * Checks whether this instruction has a substitute.
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97 * @return {@code true} if this instruction has a substitution.
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98 */
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99 public final boolean hasSubst() {
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100 return subst != null;
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101 }
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102
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103 /**
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104 * Check whether this instruction has the specified flag set.
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105 * @param flag the flag to test
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106 * @return {@code true} if this instruction has the flag
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107 */
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108 public final boolean checkFlag(Flag flag) {
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109 return (flags & flag.mask) != 0;
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110 }
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111
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112 /**
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113 * Set a flag on this instruction.
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114 * @param flag the flag to set
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115 */
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116 public final void setFlag(Flag flag) {
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117 flags |= flag.mask;
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118 }
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119
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120 /**
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121 * Clear a flag on this instruction.
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122 * @param flag the flag to set
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123 */
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124 public final void clearFlag(Flag flag) {
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125 flags &= ~flag.mask;
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126 }
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127
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128 /**
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129 * Set or clear a flag on this instruction.
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130 * @param flag the flag to set
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131 * @param val if {@code true}, set the flag, otherwise clear it
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132 */
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133 public final void setFlag(Flag flag, boolean val) {
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134 if (val) {
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135 setFlag(flag);
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136 } else {
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137 clearFlag(flag);
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138 }
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139 }
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140
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141 /**
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142 * Initialize a flag on this instruction. Assumes the flag is not initially set,
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143 * e.g. in the constructor of an instruction.
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144 * @param flag the flag to set
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145 * @param val if {@code true}, set the flag, otherwise do nothing
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146 */
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147 public final void initFlag(Flag flag, boolean val) {
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148 if (val) {
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149 setFlag(flag);
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150 }
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151 }
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152
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153 /**
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154 * Checks whether this instruction produces a value which is guaranteed to be non-null.
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155 * @return {@code true} if this instruction's value is not null
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156 */
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157 public final boolean isNonNull() {
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158 return checkFlag(Flag.NonNull);
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159 }
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160
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161 /**
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162 * Checks whether this value is a constant (i.e. it is of type {@link Constant}.
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163 * @return {@code true} if this value is a constant
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164 */
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165 public final boolean isConstant() {
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166 return this instanceof Constant;
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167 }
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168
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169 /**
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170 * Tests whether this instruction can trap. This is conservative; it does not take
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171 * into account analysis results that may eliminate the possibility of this
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172 * instruction from trapping.
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173 *
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174 * @return {@code true} if this instruction can cause a trap.
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175 */
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176 public boolean canTrap() {
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177 return false;
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178 }
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179
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180 /**
2507
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181 * Checks whether this value represents the null constant.
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182 * @return {@code true} if this value represents the null constant
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183 */
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184 public final boolean isNullConstant() {
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185 return this instanceof Constant && ((Constant) this).value.isNull();
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186 }
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187
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188 /**
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189 * Checks whether this instruction "is illegal"--i.e. it represents a dead
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190 * phi or an instruction which does not produce a value.
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191 * @return {@code true} if this instruction is illegal as an input value to another instruction
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192 */
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193 public final boolean isIllegal() {
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194 return checkFlag(Flag.PhiDead);
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195 }
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196
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197 /**
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198 * Convert this value to a constant if it is a constant, otherwise return null.
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199 * @return the {@link CiConstant} represented by this value if it is a constant; {@code null}
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200 * otherwise
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201 */
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202 public final CiConstant asConstant() {
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203 if (this instanceof Constant) {
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204 return ((Constant) this).value;
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205 }
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206 return null;
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207 }
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208
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209 /**
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210 * Gets the LIR operand associated with this instruction.
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211 * @return the LIR operand for this instruction
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212 */
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213 public final CiValue operand() {
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214 return operand;
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215 }
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216
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217 /**
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218 * Sets the LIR operand associated with this instruction.
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219 * @param operand the operand to associate with this instruction
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220 */
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221 public final void setOperand(CiValue operand) {
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222 assert this.operand.isIllegal() : "operand cannot be set twice";
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223 assert operand != null && operand.isLegal() : "operand must be legal";
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224 assert operand.kind.stackKind() == this.kind;
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225 this.operand = operand;
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226 }
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227
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228 /**
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229 * Clears the LIR operand associated with this instruction.
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230 */
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231 public final void clearOperand() {
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232 this.operand = CiValue.IllegalValue;
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233 }
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234
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235 /**
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236 * Computes the exact type of the result of this instruction, if possible.
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237 * @return the exact type of the result of this instruction, if it is known; {@code null} otherwise
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238 */
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239 public RiType exactType() {
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240 return null; // default: unknown exact type
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241 }
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242
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243 /**
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244 * Computes the declared type of the result of this instruction, if possible.
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245 * @return the declared type of the result of this instruction, if it is known; {@code null} otherwise
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246 */
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247 public RiType declaredType() {
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248 return null; // default: unknown declared type
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249 }
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250
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251 /**
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252 * Apply the specified closure to all the input values of this instruction.
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253 * @param closure the closure to apply
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254 */
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255 public void inputValuesDo(ValueClosure closure) {
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256 // default: do nothing.
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257 }
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258
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259 @Override
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260 public String toString() {
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261 StringBuilder builder = new StringBuilder();
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262 builder.append(getClass().getSimpleName());
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263 builder.append(" #");
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264 builder.append(id());
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265 if (this instanceof Instruction) {
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266 builder.append(" @ ");
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267 builder.append(((Instruction) this).bci());
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268 }
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269 builder.append(" [").append(flagsToString()).append("]");
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270 return builder.toString();
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271 }
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272
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273 public String flagsToString() {
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274 StringBuilder sb = new StringBuilder();
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275 for (Flag f : Flag.values()) {
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276 if (checkFlag(f)) {
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277 if (sb.length() != 0) {
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278 sb.append(' ');
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279 }
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280 sb.append(f.name());
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281 }
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282 }
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283 return sb.toString();
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284 }
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285
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286 public final boolean isDeadPhi() {
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287 return checkFlag(Flag.PhiDead);
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288 }
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289
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290 /**
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291 * This method supports the visitor pattern by accepting a visitor and calling the
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292 * appropriate {@code visit()} method.
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293 *
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294 * @param v the visitor to accept
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295 */
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296 public abstract void accept(ValueVisitor v);
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297
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298 public abstract void print(LogStream out);
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299
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300 /**
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301 * This method returns a unique identification number for this value. The number returned is unique
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302 * only to the compilation that produced this node and is computed lazily by using the current compilation
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303 * for the current thread. Thus the first access is a hash lookup using {@link java.lang.ThreadLocal} and
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304 * should not be considered fast. Because of the potentially slow first access, use of this ID should be
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305 * restricted to debugging output.
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306 * @return a unique ID for this value
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307 */
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308 public int id() {
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309 if (id == 0) {
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310 C1XMetrics.UniqueValueIdsAssigned++;
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311 id = C1XCompilation.compilation().nextID();
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312 }
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313 return id;
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314 }
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315 }