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annotate graal/GraalCompiler/src/com/sun/c1x/gen/LIRItem.java @ 2537:4a016ff4d2df

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Clean up on LIRGenerator and related.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 19:53:46 +0200
parents 16b9a8b5ad39
children
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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.gen;
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24
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25 import com.sun.c1x.alloc.OperandPool.*;
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26 import com.sun.c1x.ir.*;
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27 import com.sun.c1x.util.*;
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28 import com.sun.cri.ci.*;
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29
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30 /**
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31 * A helper utility for loading the {@linkplain Value#operand() result}
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32 * of an instruction for use by another instruction. This helper takes
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33 * into account the specifics of the consuming instruction such as whether
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34 * it requires the input operand to be in memory or a register, any
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35 * register size requirements of the input operand, and whether the
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36 * usage has the side-effect of overwriting the input operand. To satisfy
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37 * these constraints, an intermediate operand may be created and move
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38 * instruction inserted to copy the output of the producer instruction
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39 * into the intermediate operand.
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40 *
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41 * @author Marcelo Cintra
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42 * @author Thomas Wuerthinger
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43 * @author Doug Simon
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44 */
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45 public class LIRItem {
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46
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47 /**
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48 * The instruction whose usage by another instruction is being modeled by this object.
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49 * An instruction {@code x} uses instruction {@code y} if the {@linkplain Value#operand() result}
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50 * of {@code y} is an input operand of {@code x}.
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51 */
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52 public Value instruction;
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53
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54 /**
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55 * The LIR context of this helper object.
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56 */
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57 private final LIRGenerator gen;
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58
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59 /**
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60 * The operand holding the result of this item's {@linkplain #instruction}.
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61 */
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62 private CiValue resultOperand;
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63
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64 /**
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65 * Denotes if the use of the instruction's {@linkplain #resultOperand result operand}
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66 * overwrites the value in the operand. That is, the use both uses and defines the
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67 * operand. In this case, an {@linkplain #intermediateOperand intermediate operand}
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68 * is created for the use so that other consumers of this item's {@linkplain #instruction}
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69 * are not impacted.
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70 */
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71 private boolean destructive;
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72
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73 /**
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74 * @see #destructive
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75 */
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76 private CiValue intermediateOperand;
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77
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78 public LIRItem(Value instruction, LIRGenerator gen) {
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79 this.gen = gen;
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80 this.instruction = instruction;
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81 resultOperand = gen.makeOperand(instruction);
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82 intermediateOperand = CiValue.IllegalValue;
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83 }
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84
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85 public void loadForStore(CiKind kind) {
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86 if (gen.canStoreAsConstant(instruction, kind)) {
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87 resultOperand = instruction.operand();
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88 if (!resultOperand.isConstant()) {
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89 resultOperand = instruction.asConstant();
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90 }
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91 } else if (kind == CiKind.Byte || kind == CiKind.Boolean) {
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92 loadByteItem();
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93 } else {
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94 loadItem();
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95 }
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96 }
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97
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98 public CiValue result() {
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99 assert !destructive || !resultOperand.isRegister() : "shouldn't use setDestroysRegister with physical registers";
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100 if (destructive && (resultOperand.isVariable() || resultOperand.isConstant())) {
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101 if (intermediateOperand.isIllegal()) {
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102 intermediateOperand = gen.newVariable(instruction.kind);
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103 gen.lir.move(resultOperand, intermediateOperand);
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104 }
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105 return intermediateOperand;
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106 } else {
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107 return resultOperand;
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108 }
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109 }
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110
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111 public void setDestroysRegister() {
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112 destructive = true;
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113 }
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114
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115 /**
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116 * Determines if the operand is in a stack slot.
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117 */
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118 public boolean isStack() {
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119 return resultOperand.isAddress() || resultOperand.isStackSlot();
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120 }
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121
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122 /**
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123 * Determines if the operand is in a register or may be
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124 * resolved to a register by the register allocator.
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125 */
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126 public boolean isRegisterOrVariable() {
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127 return resultOperand.isVariableOrRegister();
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128 }
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129
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130 public void loadByteItem() {
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131 if (gen.compilation.target.arch.isX86()) {
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132 loadItem();
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133 CiValue res = result();
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134
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135 if (!res.isVariable() || !gen.operands.mustBeByteRegister(res)) {
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136 // make sure that it is a byte register
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137 assert !instruction.kind.isFloat() && !instruction.kind.isDouble() : "can't load floats in byte register";
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138 CiValue reg = gen.operands.newVariable(CiKind.Byte, VariableFlag.MustBeByteRegister);
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139 gen.lir.move(res, reg);
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140 resultOperand = reg;
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141 }
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142 } else if (gen.compilation.target.arch.isSPARC()) {
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143 loadItem();
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144 } else {
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145 Util.shouldNotReachHere();
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146 }
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147 }
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148
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149 public void loadNonconstant() {
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150 assert gen.compilation.target.arch.isX86();
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151 CiValue r = instruction.operand();
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152 if (r.isConstant()) {
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153 resultOperand = r;
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154 } else {
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155 loadItem();
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156 }
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157 }
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158
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159 private void setResult(CiVariable operand) {
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160 gen.setResult(instruction, operand);
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161 resultOperand = operand;
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162 }
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163
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164 /**
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165 * Creates an operand containing the result of {@linkplain #instruction input instruction}.
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166 */
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167 public void loadItem() {
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168 if (result().isIllegal()) {
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169 // update the item's result
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170 resultOperand = instruction.operand();
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171 }
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172 CiValue result = result();
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173 if (!result.isVariableOrRegister()) {
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174 CiVariable operand;
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175 operand = gen.newVariable(instruction.kind);
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176 gen.lir.move(result, operand);
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177 if (result.isConstant()) {
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178 resultOperand = operand;
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179 } else {
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180 setResult(operand);
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181 }
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182 }
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183 }
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184
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185 @Override
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186 public String toString() {
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187 return result().toString();
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188 }
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189 }