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annotate graal/GraalCompiler/src/com/sun/c1x/graph/IR.java @ 2741:a3cd5eb68837

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more GraphBuilder cleanup, moved mergeOrClone to GraphBuilder
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 20 May 2011 11:11:33 +0200
parents 03b80fb10ae9
children 45a58c9536de
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.c1x.graph;
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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.ir.*;
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30 import com.sun.c1x.lir.*;
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31 import com.sun.c1x.observer.*;
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32 import com.sun.c1x.value.*;
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33
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34 /**
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35 * This class implements the overall container for the HIR (high-level IR) graph
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36 * and directs its construction, optimization, and finalization.
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37 *
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38 * @author Thomas Wuerthinger
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39 * @author Ben L. Titzer
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40 */
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41 public class IR {
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42
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43 /**
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44 * The compilation associated with this IR.
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45 */
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46 public final C1XCompilation compilation;
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47
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48 /**
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49 * The start block of this IR.
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50 */
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51 public LIRBlock startBlock;
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52
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53 private int maxLocks;
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54
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55 /**
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56 * The linear-scan ordered list of blocks.
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57 */
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58 private List<LIRBlock> orderedBlocks;
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59
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60 /**
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61 * Creates a new IR instance for the specified compilation.
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62 * @param compilation the compilation
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63 */
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64 public IR(C1XCompilation compilation) {
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65 this.compilation = compilation;
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66 }
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67
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68 /**
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69 * Builds the graph, optimizes it, and computes the linear scan block order.
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70 */
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71 public void build() {
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72 if (C1XOptions.PrintTimers) {
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73 C1XTimers.HIR_CREATE.start();
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74 }
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75
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76 buildGraph();
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77
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78 if (C1XOptions.PrintTimers) {
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79 C1XTimers.HIR_CREATE.stop();
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80 C1XTimers.HIR_OPTIMIZE.start();
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81 }
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82
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83 computeLinearScanOrder();
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84
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85 if (C1XOptions.PrintTimers) {
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86 C1XTimers.HIR_OPTIMIZE.stop();
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87 }
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88 }
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89
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90 private void buildGraph() {
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91 // Graph builder must set the startBlock and the osrEntryBlock
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92 new GraphBuilder(compilation, this, compilation.graph).build();
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93 verifyAndPrint("After graph building");
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94
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95 if (C1XOptions.PrintCompilation) {
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96 TTY.print(String.format("%3d blocks | ", this.numberOfBlocks()));
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97 }
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98 }
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99
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100 private void computeLinearScanOrder() {
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101 if (C1XOptions.GenLIR) {
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102 makeLinearScanOrder();
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103 verifyAndPrint("After linear scan order");
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104 }
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105 }
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106
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107 private void makeLinearScanOrder() {
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108 if (orderedBlocks == null) {
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109 CriticalEdgeFinder finder = new CriticalEdgeFinder(this);
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110 getHIRStartBlock().iteratePreOrder(finder);
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111 finder.splitCriticalEdges();
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112 ComputeLinearScanOrder computeLinearScanOrder = new ComputeLinearScanOrder(compilation.stats.blockCount, getHIRStartBlock());
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113 List<BlockBegin> blocks = computeLinearScanOrder.linearScanOrder();
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114 orderedBlocks = new ArrayList<LIRBlock>();
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115
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116 int z = 0;
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117 for (BlockBegin bb : blocks) {
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118 LIRBlock lirBlock = new LIRBlock(z);
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119 bb.setLIRBlock(lirBlock);
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120 lirBlock.setLinearScanNumber(bb.linearScanNumber());
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121 // TODO(tw): Initialize LIRBlock.linearScanLoopHeader and LIRBlock.linearScanLoopEnd
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122 lirBlock.setStateBefore(bb.stateBefore());
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123 orderedBlocks.add(lirBlock);
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124 ++z;
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125 }
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126
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127 for (BlockBegin bb : blocks) {
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128 LIRBlock lirBlock = bb.lirBlock();
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129 for (int i = 0; i < bb.numberOfPreds(); ++i) {
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130 lirBlock.blockPredecessors().add(bb.predAt(i).block().lirBlock());
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131 }
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132
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133 for (int i = 0; i < bb.numberOfSux(); ++i) {
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134 lirBlock.blockSuccessors().add(bb.suxAt(i).lirBlock());
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135 }
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136
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137 Instruction first = bb;
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138 while (first != null) {
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139 lirBlock.getInstructions().add(first);
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140 first = first.next();
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141 }
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142 }
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143
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144 startBlock = getHIRStartBlock().lirBlock();
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145 assert startBlock != null;
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146 compilation.stats.loopCount = computeLinearScanOrder.numLoops();
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147 }
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148 }
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149
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150 /**
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151 * Gets the linear scan ordering of blocks as a list.
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152 * @return the blocks in linear scan order
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153 */
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154 public List<LIRBlock> linearScanOrder() {
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155 return orderedBlocks;
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156 }
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157
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158 private void print(boolean cfgOnly) {
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159 if (!TTY.isSuppressed()) {
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160 TTY.println("IR for " + compilation.method);
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161 final InstructionPrinter ip = new InstructionPrinter(TTY.out());
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162 final BlockPrinter bp = new BlockPrinter(this, ip, cfgOnly);
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163 getHIRStartBlock().iteratePreOrder(bp);
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164 }
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165 }
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166
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167 /**
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168 * Verifies the IR and prints it out if the relevant options are set.
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169 * @param phase the name of the phase for printing
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170 */
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171 public void verifyAndPrint(String phase) {
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172 if (C1XOptions.PrintHIR && !TTY.isSuppressed()) {
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173 TTY.println(phase);
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174 print(false);
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175 }
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176
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177 if (compilation.compiler.isObserved()) {
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178 compilation.compiler.fireCompilationEvent(new CompilationEvent(compilation, phase, getHIRStartBlock(), true, false));
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179 }
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180 }
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181
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182 /**
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183 * Creates and inserts a new block between this block and the specified successor,
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184 * altering the successor and predecessor lists of involved blocks appropriately.
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185 * @param source the source of the edge
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186 * @param target the successor before which to insert a block
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187 * @return the new block inserted
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188 */
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189 public BlockBegin splitEdge(BlockBegin source, BlockBegin target) {
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190 int bci = -2;
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191
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192 int backEdgeIndex = target.predecessors().indexOf(source.end());
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193
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194 // create new successor and mark it for special block order treatment
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195 BlockBegin newSucc = new BlockBegin(bci, nextBlockNumber(), compilation.graph);
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196
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197 // This goto is not a safepoint.
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198 Goto e = new Goto(target, null, compilation.graph);
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199 newSucc.appendNext(e);
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200 newSucc.setEnd(e);
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201 e.reorderSuccessor(0, backEdgeIndex);
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202 // setup states
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203 FrameState s = source.end().stateAfter();
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204 newSucc.setStateBefore(s);
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205 e.setStateAfter(s);
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206 assert newSucc.stateBefore().localsSize() == s.localsSize();
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207 assert newSucc.stateBefore().stackSize() == s.stackSize();
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208 assert newSucc.stateBefore().locksSize() == s.locksSize();
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209 // link predecessor to new block
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210 source.end().substituteSuccessor(target, newSucc);
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211
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212 return newSucc;
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213 }
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214
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215 public void replaceBlock(BlockBegin oldBlock, BlockBegin newBlock) {
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216 List<Instruction> predecessors = new ArrayList<Instruction>(oldBlock.blockPredecessors());
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217 for (Instruction pred : predecessors) {
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218 // substitute the new successor for this block in each predecessor
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219 pred.block().end().substituteSuccessor(oldBlock, newBlock);
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220 }
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221 oldBlock.end().clearSuccessors();
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222 }
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223
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224 public int nextBlockNumber() {
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225 return compilation.stats.blockCount++;
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226 }
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227
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228 public int numberOfBlocks() {
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229 return compilation.stats.blockCount;
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230 }
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231
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232 public int numLoops() {
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233 return compilation.stats.loopCount;
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234 }
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235
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236 /**
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237 * Updates the maximum number of locks held at any one time.
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238 *
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239 * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} if it is greater
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240 */
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241 public void updateMaxLocks(int locks) {
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242 if (locks > maxLocks) {
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243 maxLocks = locks;
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244 }
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245 }
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246
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247 /**
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248 * Gets the number of locks.
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249 * @return the number of locks
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250 */
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251 public final int maxLocks() {
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252 return maxLocks;
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253 }
2718
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254
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255 public BlockBegin getHIRStartBlock() {
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256 return (BlockBegin) compilation.graph.root().successors().get(0);
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257 }
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258 }