Mercurial > hg > graal-compiler
annotate graal/Compiler/src/com/sun/c1x/alloc/MoveResolver.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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.alloc; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.sun.c1x.*; |
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28 import com.sun.c1x.debug.*; |
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29 import com.sun.c1x.lir.*; |
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30 import com.sun.c1x.util.*; |
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31 import com.sun.cri.ci.*; |
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32 |
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33 /** |
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34 * |
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35 * @author Thomas Wuerthinger |
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36 */ |
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37 final class MoveResolver { |
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38 |
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39 private final LinearScan allocator; |
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40 |
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41 private LIRList insertList; |
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42 private int insertIdx; |
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43 private LIRInsertionBuffer insertionBuffer; // buffer where moves are inserted |
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44 |
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45 private final List<Interval> mappingFrom; |
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46 private final List<CiValue> mappingFromOpr; |
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47 private final List<Interval> mappingTo; |
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48 private boolean multipleReadsAllowed; |
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49 private final int[] registerBlocked; |
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50 |
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51 private int registerBlocked(int reg) { |
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52 return registerBlocked[reg]; |
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53 } |
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54 |
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55 private void setRegisterBlocked(int reg, int direction) { |
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56 assert direction == 1 || direction == -1 : "out of bounds"; |
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57 registerBlocked[reg] += direction; |
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58 } |
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59 |
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60 void setMultipleReadsAllowed() { |
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61 multipleReadsAllowed = true; |
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62 } |
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63 |
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64 boolean hasMappings() { |
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65 return mappingFrom.size() > 0; |
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66 } |
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67 |
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68 MoveResolver(LinearScan allocator) { |
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69 |
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70 this.allocator = allocator; |
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71 this.multipleReadsAllowed = false; |
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72 this.mappingFrom = new ArrayList<Interval>(8); |
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73 this.mappingFromOpr = new ArrayList<CiValue>(8); |
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74 this.mappingTo = new ArrayList<Interval>(8); |
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75 this.insertIdx = -1; |
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76 this.insertionBuffer = new LIRInsertionBuffer(); |
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77 this.registerBlocked = new int[allocator.registers.length]; |
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78 assert checkEmpty(); |
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79 } |
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80 |
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81 boolean checkEmpty() { |
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82 assert mappingFrom.size() == 0 && mappingFromOpr.size() == 0 && mappingTo.size() == 0 : "list must be empty before and after processing"; |
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83 for (int i = 0; i < allocator.registers.length; i++) { |
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84 assert registerBlocked(i) == 0 : "register map must be empty before and after processing"; |
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85 } |
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86 assert !multipleReadsAllowed : "must have default value"; |
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87 return true; |
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88 } |
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89 |
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90 private boolean verifyBeforeResolve() { |
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91 assert mappingFrom.size() == mappingFromOpr.size() : "length must be equal"; |
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92 assert mappingFrom.size() == mappingTo.size() : "length must be equal"; |
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93 assert insertList != null && insertIdx != -1 : "insert position not set"; |
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94 |
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95 int i; |
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96 int j; |
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97 if (!multipleReadsAllowed) { |
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98 for (i = 0; i < mappingFrom.size(); i++) { |
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99 for (j = i + 1; j < mappingFrom.size(); j++) { |
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100 assert mappingFrom.get(i) == null || mappingFrom.get(i) != mappingFrom.get(j) : "cannot read from same interval twice"; |
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101 } |
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102 } |
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103 } |
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104 |
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105 for (i = 0; i < mappingTo.size(); i++) { |
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106 for (j = i + 1; j < mappingTo.size(); j++) { |
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107 assert mappingTo.get(i) != mappingTo.get(j) : "cannot write to same interval twice"; |
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108 } |
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109 } |
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110 |
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111 HashSet<CiValue> usedRegs = new HashSet<CiValue>(); |
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112 if (!multipleReadsAllowed) { |
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113 for (i = 0; i < mappingFrom.size(); i++) { |
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114 Interval interval = mappingFrom.get(i); |
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115 if (interval != null) { |
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116 boolean unique = usedRegs.add(interval.location()); |
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117 assert unique : "cannot read from same register twice"; |
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118 } |
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119 } |
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120 } |
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121 |
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122 usedRegs.clear(); |
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123 for (i = 0; i < mappingTo.size(); i++) { |
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124 Interval interval = mappingTo.get(i); |
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125 boolean unique = usedRegs.add(interval.location()); |
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126 assert unique : "cannot write to same register twice"; |
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127 } |
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128 |
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129 usedRegs.clear(); |
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130 for (i = 0; i < mappingFrom.size(); i++) { |
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131 Interval interval = mappingFrom.get(i); |
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132 if (interval != null && !interval.location().isRegister()) { |
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133 usedRegs.add(interval.location()); |
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134 } |
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135 } |
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136 for (i = 0; i < mappingTo.size(); i++) { |
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137 Interval interval = mappingTo.get(i); |
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138 assert !usedRegs.contains(interval.location()) || interval.location() == mappingFrom.get(i).location() : "stack slots used in mappingFrom must be disjoint to mappingTo"; |
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139 } |
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140 |
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141 return true; |
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142 } |
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143 |
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144 // mark assignedReg and assignedRegHi of the interval as blocked |
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145 private void blockRegisters(Interval interval) { |
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146 CiValue location = interval.location(); |
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147 if (location.isRegister()) { |
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148 int reg = location.asRegister().number; |
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149 assert multipleReadsAllowed || registerBlocked(reg) == 0 : "register already marked as used"; |
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150 setRegisterBlocked(reg, 1); |
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151 } |
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152 } |
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153 |
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154 // mark assignedReg and assignedRegHi of the interval as unblocked |
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155 private void unblockRegisters(Interval interval) { |
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156 CiValue location = interval.location(); |
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157 if (location.isRegister()) { |
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158 int reg = location.asRegister().number; |
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159 assert registerBlocked(reg) > 0 : "register already marked as unused"; |
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160 setRegisterBlocked(reg, -1); |
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161 } |
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162 } |
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163 |
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164 /** |
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165 * Checks if the {@linkplain Interval#location() location} of {@code to} is not blocked |
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166 * or is only blocked by {@code from}. |
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167 */ |
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168 private boolean safeToProcessMove(Interval from, Interval to) { |
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169 CiValue fromReg = from != null ? from.location() : null; |
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170 |
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171 CiValue reg = to.location(); |
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172 if (reg.isRegister()) { |
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173 if (registerBlocked(reg.asRegister().number) > 1 || (registerBlocked(reg.asRegister().number) == 1 && reg != fromReg)) { |
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174 return false; |
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175 } |
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176 } |
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177 |
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178 return true; |
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179 } |
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180 |
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181 private void createInsertionBuffer(LIRList list) { |
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182 assert !insertionBuffer.initialized() : "overwriting existing buffer"; |
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183 insertionBuffer.init(list); |
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184 } |
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185 |
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186 private void appendInsertionBuffer() { |
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187 if (insertionBuffer.initialized()) { |
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188 insertionBuffer.lirList().append(insertionBuffer); |
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189 } |
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190 assert !insertionBuffer.initialized() : "must be uninitialized now"; |
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191 |
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192 insertList = null; |
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193 insertIdx = -1; |
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194 } |
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195 |
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196 private void insertMove(Interval fromInterval, Interval toInterval) { |
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197 assert fromInterval.operand != toInterval.operand : "from and to interval equal: " + fromInterval; |
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198 assert Util.archKindsEqual(fromInterval.kind(), toInterval.kind()) : "move between different types"; |
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199 assert insertList != null && insertIdx != -1 : "must setup insert position first"; |
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200 assert insertionBuffer.lirList() == insertList : "wrong insertion buffer"; |
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201 |
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202 CiValue fromOpr = fromInterval.operand; |
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203 CiValue toOpr = toInterval.operand; |
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204 |
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205 insertionBuffer.move(insertIdx, fromOpr, toOpr, null); |
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206 |
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207 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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208 TTY.println("MoveResolver: inserted move from %d (%s) to %d (%s)", fromInterval.operandNumber, fromInterval.location(), toInterval.operandNumber, toInterval.location()); |
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209 } |
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210 } |
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211 |
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212 private void insertMove(CiValue fromOpr, Interval toInterval) { |
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213 assert Util.archKindsEqual(fromOpr.kind, toInterval.kind()) : "move between different types"; |
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214 assert insertList != null && insertIdx != -1 : "must setup insert position first"; |
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215 assert insertionBuffer.lirList() == insertList : "wrong insertion buffer"; |
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216 |
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217 CiValue toOpr = toInterval.operand; |
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218 insertionBuffer.move(insertIdx, fromOpr, toOpr, null); |
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219 |
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220 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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221 TTY.print("MoveResolver: inserted move from constant %s to %d (%s)", fromOpr, toInterval.operandNumber, toInterval.location()); |
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222 } |
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223 } |
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224 |
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225 private void resolveMappings() { |
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226 //if (C1XOptions.TraceLinearScanLevel >= 4) TTY.println("MoveResolver: resolving mappings for Block B%d, index %d", insertList.block() != null ? insertList.block().blockID : -1, insertIdx); |
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227 assert verifyBeforeResolve(); |
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228 |
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229 // Block all registers that are used as input operands of a move. |
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230 // When a register is blocked, no move to this register is emitted. |
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231 // This is necessary for detecting cycles in moves. |
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232 int i; |
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233 for (i = mappingFrom.size() - 1; i >= 0; i--) { |
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234 Interval fromInterval = mappingFrom.get(i); |
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235 if (fromInterval != null) { |
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236 blockRegisters(fromInterval); |
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237 } |
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238 } |
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239 |
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240 int spillCandidate = -1; |
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241 while (mappingFrom.size() > 0) { |
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242 boolean processedInterval = false; |
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243 |
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244 for (i = mappingFrom.size() - 1; i >= 0; i--) { |
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245 Interval fromInterval = mappingFrom.get(i); |
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246 Interval toInterval = mappingTo.get(i); |
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247 |
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248 if (safeToProcessMove(fromInterval, toInterval)) { |
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249 // this interval can be processed because target is free |
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250 if (fromInterval != null) { |
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251 insertMove(fromInterval, toInterval); |
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252 unblockRegisters(fromInterval); |
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253 } else { |
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254 insertMove(mappingFromOpr.get(i), toInterval); |
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255 } |
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256 mappingFrom.remove(i); |
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257 mappingFromOpr.remove(i); |
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258 mappingTo.remove(i); |
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259 |
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260 processedInterval = true; |
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261 } else if (fromInterval != null && fromInterval.location().isRegister()) { |
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262 // this interval cannot be processed now because target is not free |
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263 // it starts in a register, so it is a possible candidate for spilling |
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264 spillCandidate = i; |
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265 } |
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266 } |
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267 |
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268 if (!processedInterval) { |
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269 // no move could be processed because there is a cycle in the move list |
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270 // (e.g. r1 . r2, r2 . r1), so one interval must be spilled to memory |
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271 assert spillCandidate != -1 : "no interval in register for spilling found"; |
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272 |
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273 // create a new spill interval and assign a stack slot to it |
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274 Interval fromInterval = mappingFrom.get(spillCandidate); |
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275 Interval spillInterval = allocator.createDerivedInterval(fromInterval); |
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276 spillInterval.setKind(fromInterval.kind()); |
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277 |
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278 // add a dummy range because real position is difficult to calculate |
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279 // Note: this range is a special case when the integrity of the allocation is checked |
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280 spillInterval.addRange(1, 2); |
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281 |
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282 // do not allocate a new spill slot for temporary interval, but |
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283 // use spill slot assigned to fromInterval. Otherwise moves from |
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284 // one stack slot to another can happen (not allowed by LIRAssembler |
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285 CiStackSlot spillSlot = fromInterval.spillSlot(); |
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286 if (spillSlot == null) { |
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287 spillSlot = allocator.allocateSpillSlot(spillInterval.kind()); |
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288 fromInterval.setSpillSlot(spillSlot); |
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289 } |
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290 spillInterval.assignLocation(spillSlot); |
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291 |
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292 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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293 TTY.println("created new Interval %s for spilling", spillInterval.operand); |
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294 } |
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295 |
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296 // insert a move from register to stack and update the mapping |
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297 insertMove(fromInterval, spillInterval); |
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298 mappingFrom.set(spillCandidate, spillInterval); |
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299 unblockRegisters(fromInterval); |
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300 } |
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301 } |
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302 |
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303 // reset to default value |
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304 multipleReadsAllowed = false; |
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305 |
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306 // check that all intervals have been processed |
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307 assert checkEmpty(); |
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308 } |
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309 |
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310 void setInsertPosition(LIRList insertList, int insertIdx) { |
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311 //if (C1XOptions.TraceLinearScanLevel >= 4) TTY.println("MoveResolver: setting insert position to Block B%d, index %d", insertList.block() != null ? insertList.block().blockID : -1, insertIdx); |
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312 assert this.insertList == null && this.insertIdx == -1 : "use moveInsertPosition instead of setInsertPosition when data already set"; |
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313 |
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314 createInsertionBuffer(insertList); |
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315 this.insertList = insertList; |
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316 this.insertIdx = insertIdx; |
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317 } |
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318 |
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319 void moveInsertPosition(LIRList insertList, int insertIdx) { |
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320 //if (C1XOptions.TraceLinearScanLevel >= 4) TTY.println("MoveResolver: moving insert position to Block B%d, index %d", (insertList != null && insertList.block() != null) ? insertList.block().blockID : -1, insertIdx); |
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321 |
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322 if (this.insertList != null && (this.insertList != insertList || this.insertIdx != insertIdx)) { |
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323 // insert position changed . resolve current mappings |
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324 resolveMappings(); |
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325 } |
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326 |
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327 if (this.insertList != insertList) { |
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328 // block changed . append insertionBuffer because it is |
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329 // bound to a specific block and create a new insertionBuffer |
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330 appendInsertionBuffer(); |
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331 createInsertionBuffer(insertList); |
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332 } |
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333 |
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334 this.insertList = insertList; |
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335 this.insertIdx = insertIdx; |
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336 } |
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337 |
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338 void addMapping(Interval fromInterval, Interval toInterval) { |
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339 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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340 TTY.println("MoveResolver: adding mapping from interval %d (%s) to interval %d (%s)", fromInterval.operandNumber, fromInterval.location(), toInterval.operandNumber, toInterval.location()); |
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341 } |
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342 |
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343 assert fromInterval.operand != toInterval.operand : "from and to interval equal: " + fromInterval; |
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344 assert Util.archKindsEqual(fromInterval.kind(), toInterval.kind()); |
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345 mappingFrom.add(fromInterval); |
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346 mappingFromOpr.add(CiValue.IllegalValue); |
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347 mappingTo.add(toInterval); |
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348 } |
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349 |
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350 void addMapping(CiValue fromOpr, Interval toInterval) { |
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351 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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352 TTY.println("MoveResolver: adding mapping from %s to %d (%s)", fromOpr, toInterval.operandNumber, toInterval.location()); |
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353 } |
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354 assert fromOpr.isConstant() : "only for constants"; |
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355 |
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356 mappingFrom.add(null); |
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357 mappingFromOpr.add(fromOpr); |
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358 mappingTo.add(toInterval); |
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359 } |
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360 |
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361 void resolveAndAppendMoves() { |
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362 if (hasMappings()) { |
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363 resolveMappings(); |
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364 } |
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365 appendInsertionBuffer(); |
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366 } |
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367 } |