Mercurial > hg > graal-compiler
annotate graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/alloc/RegisterVerifier.java @ 6525:2c913b643422
rename packages in graal.phases to match project name
author | Doug Simon <doug.simon@oracle.com> |
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date | Sun, 07 Oct 2012 14:15:44 +0200 |
parents | 8fd4201ce98c |
children | 2e96dc4eb8e2 |
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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.compiler.alloc; |
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24 |
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25 import static com.oracle.graal.api.code.ValueUtil.*; |
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26 |
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27 import java.util.*; |
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28 |
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29 import com.oracle.graal.api.code.*; |
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30 import com.oracle.graal.api.meta.*; |
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31 import com.oracle.graal.debug.*; |
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32 import com.oracle.graal.graph.*; |
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33 import com.oracle.graal.lir.*; |
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34 import com.oracle.graal.lir.LIRInstruction.*; |
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35 import com.oracle.graal.lir.cfg.*; |
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36 import com.oracle.graal.phases.*; |
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37 import com.oracle.graal.phases.util.*; |
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38 |
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39 /** |
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40 */ |
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41 final class RegisterVerifier { |
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42 |
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43 LinearScan allocator; |
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44 List<Block> workList; // all blocks that must be processed |
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45 ArrayMap<Interval[]> savedStates; // saved information of previous check |
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46 |
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47 // simplified access to methods of LinearScan |
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48 Interval intervalAt(Value operand) { |
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49 return allocator.intervalFor(operand); |
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50 } |
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51 |
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52 // currently, only registers are processed |
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53 int stateSize() { |
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54 return allocator.maxRegisterNumber() + 1; |
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55 } |
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56 |
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57 // accessors |
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58 Interval[] stateForBlock(Block block) { |
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59 return savedStates.get(block.getId()); |
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60 } |
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61 |
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62 void setStateForBlock(Block block, Interval[] savedState) { |
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63 savedStates.put(block.getId(), savedState); |
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64 } |
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65 |
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66 void addToWorkList(Block block) { |
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67 if (!workList.contains(block)) { |
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68 workList.add(block); |
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69 } |
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70 } |
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71 |
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72 RegisterVerifier(LinearScan allocator) { |
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73 this.allocator = allocator; |
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74 workList = new ArrayList<>(16); |
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75 this.savedStates = new ArrayMap<>(); |
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76 |
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77 } |
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78 |
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79 void verify(Block start) { |
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80 // setup input registers (method arguments) for first block |
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81 Interval[] inputState = new Interval[stateSize()]; |
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82 setStateForBlock(start, inputState); |
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83 addToWorkList(start); |
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84 |
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85 // main loop for verification |
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86 do { |
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87 Block block = workList.get(0); |
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88 workList.remove(0); |
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89 |
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90 processBlock(block); |
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91 } while (!workList.isEmpty()); |
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92 } |
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93 |
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94 private void processBlock(Block block) { |
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95 if (GraalOptions.TraceLinearScanLevel >= 2) { |
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96 TTY.println(); |
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97 TTY.println("processBlock B%d", block.getId()); |
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98 } |
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99 |
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100 // must copy state because it is modified |
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101 Interval[] inputState = copy(stateForBlock(block)); |
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102 |
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103 if (GraalOptions.TraceLinearScanLevel >= 4) { |
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104 TTY.println("Input-State of intervals:"); |
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105 TTY.print(" "); |
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106 for (int i = 0; i < stateSize(); i++) { |
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107 if (inputState[i] != null) { |
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108 TTY.print(" %4d", inputState[i].operandNumber); |
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109 } else { |
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110 TTY.print(" __"); |
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111 } |
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112 } |
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113 TTY.println(); |
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114 TTY.println(); |
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115 } |
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116 |
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117 // process all operations of the block |
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118 processOperations(allocator.ir.lir(block), inputState); |
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119 |
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120 // iterate all successors |
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121 for (int i = 0; i < block.numberOfSux(); i++) { |
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122 Block succ = block.suxAt(i); |
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123 processSuccessor(succ, inputState); |
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124 } |
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125 } |
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126 |
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127 private void processSuccessor(Block block, Interval[] inputState) { |
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128 Interval[] savedState = stateForBlock(block); |
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129 |
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130 if (savedState != null) { |
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131 // this block was already processed before. |
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132 // check if new inputState is consistent with savedState |
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133 |
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134 boolean savedStateCorrect = true; |
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135 for (int i = 0; i < stateSize(); i++) { |
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136 if (inputState[i] != savedState[i]) { |
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137 // current inputState and previous savedState assume a different |
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138 // interval in this register . assume that this register is invalid |
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139 if (savedState[i] != null) { |
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140 // invalidate old calculation only if it assumed that |
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141 // register was valid. when the register was already invalid, |
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142 // then the old calculation was correct. |
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143 savedStateCorrect = false; |
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144 savedState[i] = null; |
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145 |
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146 if (GraalOptions.TraceLinearScanLevel >= 4) { |
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147 TTY.println("processSuccessor B%d: invalidating slot %d", block.getId(), i); |
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148 } |
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149 } |
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150 } |
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151 } |
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152 |
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153 if (savedStateCorrect) { |
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154 // already processed block with correct inputState |
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155 if (GraalOptions.TraceLinearScanLevel >= 2) { |
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156 TTY.println("processSuccessor B%d: previous visit already correct", block.getId()); |
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157 } |
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158 } else { |
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159 // must re-visit this block |
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160 if (GraalOptions.TraceLinearScanLevel >= 2) { |
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161 TTY.println("processSuccessor B%d: must re-visit because input state changed", block.getId()); |
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162 } |
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163 addToWorkList(block); |
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164 } |
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165 |
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166 } else { |
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167 // block was not processed before, so set initial inputState |
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168 if (GraalOptions.TraceLinearScanLevel >= 2) { |
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169 TTY.println("processSuccessor B%d: initial visit", block.getId()); |
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170 } |
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171 |
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172 setStateForBlock(block, copy(inputState)); |
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173 addToWorkList(block); |
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174 } |
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175 } |
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176 |
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177 static Interval[] copy(Interval[] inputState) { |
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178 return inputState.clone(); |
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179 } |
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180 |
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181 static void statePut(Interval[] inputState, Value location, Interval interval) { |
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182 if (location != null && isRegister(location)) { |
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183 Register reg = asRegister(location); |
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184 int regNum = reg.number; |
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185 if (interval != null) { |
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186 if (GraalOptions.TraceLinearScanLevel >= 4) { |
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187 TTY.println(" %s = %s", reg, interval.operand); |
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188 } |
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189 } else if (inputState[regNum] != null) { |
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190 if (GraalOptions.TraceLinearScanLevel >= 4) { |
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191 TTY.println(" %s = null", reg); |
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192 } |
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193 } |
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194 |
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195 inputState[regNum] = interval; |
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196 } |
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197 } |
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198 |
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199 static boolean checkState(Interval[] inputState, Value reg, Interval interval) { |
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200 if (reg != null && isRegister(reg)) { |
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201 if (inputState[asRegister(reg).number] != interval) { |
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202 throw new GraalInternalError("!! Error in register allocation: register %s does not contain interval %s but interval %s", reg, interval.operand, inputState[asRegister(reg).number]); |
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203 } |
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204 } |
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205 return true; |
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206 } |
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207 |
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208 void processOperations(List<LIRInstruction> ops, final Interval[] inputState) { |
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209 // visit all instructions of the block |
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210 for (int i = 0; i < ops.size(); i++) { |
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211 final LIRInstruction op = ops.get(i); |
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212 |
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213 if (GraalOptions.TraceLinearScanLevel >= 4) { |
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214 TTY.println(op.toStringWithIdPrefix()); |
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215 } |
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216 |
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217 ValueProcedure useProc = new ValueProcedure() { |
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218 @Override |
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219 public Value doValue(Value operand, OperandMode mode, EnumSet<OperandFlag> flags) { |
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220 if (LinearScan.isVariableOrRegister(operand) && allocator.isProcessed(operand)) { |
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221 Interval interval = intervalAt(operand); |
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222 if (op.id() != -1) { |
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223 interval = interval.getSplitChildAtOpId(op.id(), mode, allocator); |
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224 } |
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225 |
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226 assert checkState(inputState, interval.location(), interval.splitParent()); |
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227 } |
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228 return operand; |
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229 } |
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230 }; |
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231 |
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232 ValueProcedure defProc = new ValueProcedure() { |
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233 @Override |
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234 public Value doValue(Value operand, OperandMode mode, EnumSet<OperandFlag> flags) { |
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235 if (LinearScan.isVariableOrRegister(operand) && allocator.isProcessed(operand)) { |
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236 Interval interval = intervalAt(operand); |
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237 if (op.id() != -1) { |
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238 interval = interval.getSplitChildAtOpId(op.id(), mode, allocator); |
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239 } |
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240 |
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241 statePut(inputState, interval.location(), interval.splitParent()); |
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242 } |
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243 return operand; |
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244 } |
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245 }; |
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246 |
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247 // check if input operands are correct |
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248 op.forEachInput(useProc); |
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249 // invalidate all caller save registers at calls |
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250 if (op.hasCall()) { |
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251 for (Register r : allocator.frameMap.registerConfig.getCallerSaveRegisters()) { |
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252 statePut(inputState, r.asValue(), null); |
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253 } |
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254 } |
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255 op.forEachAlive(useProc); |
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256 // set temp operands (some operations use temp operands also as output operands, so can't set them null) |
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257 op.forEachTemp(defProc); |
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258 // set output operands |
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259 op.forEachOutput(defProc); |
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260 } |
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261 } |
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262 } |