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annotate graal/com.oracle.graal.lir/src/com/oracle/graal/lir/LIRInstruction.java @ 9856:fbeda9df497d

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implemented workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=409824
author Doug Simon <doug.simon@oracle.com>
date Tue, 04 Jun 2013 12:21:32 +0200
parents c59beafffb29
children 5d5bfb75dae0
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1 /*
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2 * Copyright (c) 2009, 2012, 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.oracle.graal.lir;
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24
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25 import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*;
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26 import static com.oracle.graal.lir.LIRInstruction.OperandMode.*;
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27
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28 import java.lang.annotation.*;
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29 import java.util.*;
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30
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31 import com.oracle.graal.api.code.*;
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32 import com.oracle.graal.api.meta.*;
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33 import com.oracle.graal.graph.*;
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34 import com.oracle.graal.lir.asm.*;
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35
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36 /**
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37 * The {@code LIRInstruction} class definition.
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38 */
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39 public abstract class LIRInstruction {
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40
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41 public static final Value[] NO_OPERANDS = {};
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42
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43 /**
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44 * Iterator for iterating over a list of values. Subclasses must overwrite one of the doValue
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45 * methods. Clients of the class must only call the doValue method that takes additional
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46 * parameters.
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47 */
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48 public abstract static class ValueProcedure {
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49
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50 /**
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51 * Iterator method to be overwritten. This version of the iterator does not take additional
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52 * parameters to keep the signature short.
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53 *
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54 * @param value The value that is iterated.
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55 * @return The new value to replace the value that was passed in.
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56 */
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57 protected Value doValue(Value value) {
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58 throw GraalInternalError.shouldNotReachHere("One of the doValue() methods must be overwritten");
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59 }
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60
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61 /**
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62 * Iterator method to be overwritten. This version of the iterator gets additional
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63 * parameters about the processed value.
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64 *
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65 * @param value The value that is iterated.
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66 * @param mode The operand mode for the value.
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67 * @param flags A set of flags for the value.
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68 * @return The new value to replace the value that was passed in.
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69 */
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70 public Value doValue(Value value, OperandMode mode, EnumSet<OperandFlag> flags) {
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71 return doValue(value);
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72 }
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73 }
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74
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75 public abstract static class StateProcedure {
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76
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77 protected abstract void doState(LIRFrameState state);
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78 }
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79
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80 /**
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81 * Constants denoting how a LIR instruction uses an operand.
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82 */
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83 public enum OperandMode {
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84 /**
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85 * The value must have been defined before. It is alive before the instruction until the
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86 * beginning of the instruction, but not necessarily throughout the instruction. A register
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87 * assigned to it can also be assigned to a {@link #TEMP} or {@link #DEF} operand. The value
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88 * can be used again after the instruction, so the instruction must not modify the register.
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89 */
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90 USE,
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91
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92 /**
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93 * The value must have been defined before. It is alive before the instruction and
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94 * throughout the instruction. A register assigned to it cannot be assigned to a
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95 * {@link #TEMP} or {@link #DEF} operand. The value can be used again after the instruction,
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96 * so the instruction must not modify the register.
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97 */
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98 ALIVE,
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99
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100 /**
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101 * The value must not have been defined before, and must not be used after the instruction.
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102 * The instruction can do whatever it wants with the register assigned to it (or not use it
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103 * at all).
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104 */
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105 TEMP,
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106
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107 /**
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108 * The value must not have been defined before. The instruction has to assign a value to the
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109 * register. The value can (and most likely will) be used after the instruction.
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110 */
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111 DEF,
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112 }
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113
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114 @Retention(RetentionPolicy.RUNTIME)
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115 @Target(ElementType.FIELD)
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116 public static @interface Use {
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117
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118 OperandFlag[] value() default REG;
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119 }
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120
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121 @Retention(RetentionPolicy.RUNTIME)
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122 @Target(ElementType.FIELD)
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123 public static @interface Alive {
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124
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125 OperandFlag[] value() default REG;
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126 }
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127
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128 @Retention(RetentionPolicy.RUNTIME)
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129 @Target(ElementType.FIELD)
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130 public static @interface Temp {
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131
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132 OperandFlag[] value() default REG;
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133 }
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134
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135 @Retention(RetentionPolicy.RUNTIME)
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136 @Target(ElementType.FIELD)
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137 public static @interface Def {
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138
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139 OperandFlag[] value() default REG;
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140 }
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141
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142 @Retention(RetentionPolicy.RUNTIME)
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143 @Target(ElementType.FIELD)
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144 public static @interface State {
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145 }
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146
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147 /**
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148 * Flags for an operand.
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149 */
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150 public enum OperandFlag {
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151 /**
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152 * The value can be a {@link RegisterValue}.
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153 */
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154 REG,
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155
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156 /**
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157 * The value can be a {@link StackSlot}.
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158 */
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159 STACK,
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160
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161 /**
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162 * The value can be a {@link CompositeValue}.
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163 */
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164 COMPOSITE,
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165
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166 /**
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167 * The value can be a {@link Constant}.
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168 */
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169 CONST,
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170
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171 /**
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172 * The value can be {@link Value#ILLEGAL}.
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173 */
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174 ILLEGAL,
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175
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176 /**
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177 * The register allocator should try to assign a certain register to improve code quality.
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178 * Use {@link LIRInstruction#forEachRegisterHint} to access the register hints.
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179 */
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180 HINT,
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181
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182 /**
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183 * The value can be uninitialized, e.g., a stack slot that has not written to before. This
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184 * is only used to avoid false positives in verification code.
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185 */
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186 UNINITIALIZED,
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187 }
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188
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189 /**
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190 * For validity checking of the operand flags defined by instruction subclasses.
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191 */
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192 protected static final EnumMap<OperandMode, EnumSet<OperandFlag>> ALLOWED_FLAGS;
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193
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194 static {
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195 ALLOWED_FLAGS = new EnumMap<>(OperandMode.class);
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196 ALLOWED_FLAGS.put(USE, EnumSet.of(REG, STACK, COMPOSITE, CONST, ILLEGAL, HINT, UNINITIALIZED));
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197 ALLOWED_FLAGS.put(ALIVE, EnumSet.of(REG, STACK, COMPOSITE, CONST, ILLEGAL, HINT, UNINITIALIZED));
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198 ALLOWED_FLAGS.put(TEMP, EnumSet.of(REG, COMPOSITE, CONST, ILLEGAL, HINT));
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199 ALLOWED_FLAGS.put(DEF, EnumSet.of(REG, STACK, COMPOSITE, ILLEGAL, HINT));
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200 }
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201
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202 /**
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203 * The flags of the base and index value of an address.
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204 */
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205 protected static final EnumSet<OperandFlag> ADDRESS_FLAGS = EnumSet.of(REG, ILLEGAL);
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206
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207 private final LIRInstructionClass instructionClass;
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208
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209 /**
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210 * Instruction id for register allocation.
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211 */
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212 private int id;
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213
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214 /**
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215 * Constructs a new LIR instruction.
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216 */
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217 public LIRInstruction() {
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218 instructionClass = LIRInstructionClass.get(getClass());
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219 id = -1;
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220 }
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221
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222 public abstract void emitCode(TargetMethodAssembler tasm);
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223
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224 public final int id() {
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225 return id;
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226 }
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227
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228 public final void setId(int id) {
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229 this.id = id;
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230 }
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231
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232 /**
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233 * Gets the instruction name.
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234 */
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235 public final String name() {
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236 return instructionClass.getOpcode(this);
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237 }
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238
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239 public final boolean hasOperands() {
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240 return instructionClass.hasOperands() || hasState() || destroysCallerSavedRegisters();
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241 }
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242
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243 public final boolean hasState() {
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244 return instructionClass.hasState(this);
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245 }
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246
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247 /**
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248 * Determines if this instruction destroys all caller-saved registers..
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249 */
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250 public boolean destroysCallerSavedRegisters() {
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251 return false;
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252 }
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253
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254 public final void forEachInput(ValueProcedure proc) {
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255 instructionClass.forEachUse(this, proc);
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256 }
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257
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258 public final void forEachAlive(ValueProcedure proc) {
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259 instructionClass.forEachAlive(this, proc);
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260 }
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261
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262 public final void forEachTemp(ValueProcedure proc) {
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263 instructionClass.forEachTemp(this, proc);
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264 }
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265
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266 public final void forEachOutput(ValueProcedure proc) {
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267 instructionClass.forEachDef(this, proc);
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268 }
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269
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270 public final void forEachState(ValueProcedure proc) {
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271 instructionClass.forEachState(this, proc);
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272 }
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273
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274 public final void forEachState(StateProcedure proc) {
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275 instructionClass.forEachState(this, proc);
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276 }
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277
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278 /**
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279 * Iterates all register hints for the specified value, i.e., all preferred candidates for the
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280 * register to be assigned to the value.
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281 * <p>
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282 * Subclasses can override this method. The default implementation processes all Input operands
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283 * as the hints for an Output operand, and all Output operands as the hints for an Input
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284 * operand.
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285 *
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286 * @param value The value the hints are needed for.
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287 * @param mode The operand mode of the value.
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288 * @param proc The procedure invoked for all the hints. If the procedure returns a non-null
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289 * value, the iteration is stopped and the value is returned by this method, i.e.,
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290 * clients can stop the iteration once a suitable hint has been found.
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291 * @return The non-null value returned by the procedure, or null.
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292 */
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293 public Value forEachRegisterHint(Value value, OperandMode mode, ValueProcedure proc) {
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294 return instructionClass.forEachRegisterHint(this, mode, proc);
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295 }
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296
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297 protected void verify() {
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298 }
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299
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300 public final String toStringWithIdPrefix() {
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301 if (id != -1) {
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302 return String.format("%4d %s", id, toString());
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303 }
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304 return " " + toString();
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305 }
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306
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307 @Override
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308 public String toString() {
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309 return instructionClass.toString(this);
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310 }
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311 }