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annotate graal/GraalCompiler/src/com/sun/c1x/graph/IR.java @ 2756:bfcdda4fdd73

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Removed the direct connection between BlockBegin and BlockEnd.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Fri, 20 May 2011 14:51:45 +0200
parents 0fe79e7435c3
children b72e6638b9e6
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.oracle.max.graal.schedule.*;
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28 import com.sun.c1x.*;
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29 import com.sun.c1x.debug.*;
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30 import com.sun.c1x.ir.*;
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31 import com.sun.c1x.lir.*;
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32 import com.sun.c1x.observer.*;
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33 import com.sun.c1x.value.*;
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34
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35 /**
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36 * This class implements the overall container for the HIR (high-level IR) graph
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37 * and directs its construction, optimization, and finalization.
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38 *
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39 * @author Thomas Wuerthinger
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40 * @author Ben L. Titzer
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41 */
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42 public class IR {
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43
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44 /**
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45 * The compilation associated with this IR.
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46 */
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47 public final C1XCompilation compilation;
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48
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49 /**
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50 * The start block of this IR.
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51 */
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52 public LIRBlock startBlock;
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53
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54 private int maxLocks;
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55
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56 /**
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57 * The linear-scan ordered list of blocks.
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58 */
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59 private List<LIRBlock> orderedBlocks;
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60
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61 /**
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62 * Creates a new IR instance for the specified compilation.
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63 * @param compilation the compilation
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64 */
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65 public IR(C1XCompilation compilation) {
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66 this.compilation = compilation;
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67 }
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68
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69 /**
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70 * Builds the graph, optimizes it, and computes the linear scan block order.
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71 */
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72 public void build() {
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73 if (C1XOptions.PrintTimers) {
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74 C1XTimers.HIR_CREATE.start();
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75 }
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76
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77 buildGraph();
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78
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79 if (C1XOptions.PrintTimers) {
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80 C1XTimers.HIR_CREATE.stop();
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81 C1XTimers.HIR_OPTIMIZE.start();
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82 }
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83
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84 Schedule schedule = new Schedule(this.compilation.graph);
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85
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86 computeLinearScanOrder();
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87
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88 if (C1XOptions.PrintTimers) {
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89 C1XTimers.HIR_OPTIMIZE.stop();
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90 }
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91 }
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92
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93 private void buildGraph() {
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94 // Graph builder must set the startBlock and the osrEntryBlock
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95 new GraphBuilder(compilation, this, compilation.graph).build();
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96 verifyAndPrint("After graph building");
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97
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98 if (C1XOptions.PrintCompilation) {
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99 TTY.print(String.format("%3d blocks | ", this.numberOfBlocks()));
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100 }
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101 }
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102
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103 private void computeLinearScanOrder() {
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104 if (C1XOptions.GenLIR) {
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105 makeLinearScanOrder();
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106 verifyAndPrint("After linear scan order");
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107 }
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108 }
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109
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110 private void makeLinearScanOrder() {
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111 if (orderedBlocks == null) {
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112 CriticalEdgeFinder finder = new CriticalEdgeFinder(this);
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113 getHIRStartBlock().iteratePreOrder(finder);
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114 finder.splitCriticalEdges();
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115 ComputeLinearScanOrder computeLinearScanOrder = new ComputeLinearScanOrder(compilation.stats.blockCount, getHIRStartBlock());
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116 List<BlockBegin> blocks = computeLinearScanOrder.linearScanOrder();
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117 orderedBlocks = new ArrayList<LIRBlock>();
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118
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119 int z = 0;
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120 for (BlockBegin bb : blocks) {
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121 LIRBlock lirBlock = new LIRBlock(z);
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122 bb.setLIRBlock(lirBlock);
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123 lirBlock.setLinearScanNumber(bb.linearScanNumber());
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124 // TODO(tw): Initialize LIRBlock.linearScanLoopHeader and LIRBlock.linearScanLoopEnd
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125 lirBlock.setStateBefore(bb.stateBefore());
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126 orderedBlocks.add(lirBlock);
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127 ++z;
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128 }
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129
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130 for (BlockBegin bb : blocks) {
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131 LIRBlock lirBlock = bb.lirBlock();
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132 for (int i = 0; i < bb.numberOfPreds(); ++i) {
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133 lirBlock.blockPredecessors().add(bb.predAt(i).block().lirBlock());
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134 }
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135
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136 for (int i = 0; i < bb.numberOfSux(); ++i) {
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137 lirBlock.blockSuccessors().add(bb.suxAt(i).lirBlock());
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138 }
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139
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140 Instruction first = bb;
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141 while (first != null) {
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142 lirBlock.getInstructions().add(first);
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143 first = first.next();
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144 }
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145 }
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146
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147 startBlock = getHIRStartBlock().lirBlock();
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148 assert startBlock != null;
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149 compilation.stats.loopCount = computeLinearScanOrder.numLoops();
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150 }
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151 }
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152
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153 /**
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154 * Gets the linear scan ordering of blocks as a list.
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155 * @return the blocks in linear scan order
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156 */
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157 public List<LIRBlock> linearScanOrder() {
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158 return orderedBlocks;
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159 }
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160
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161 private void print(boolean cfgOnly) {
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162 if (!TTY.isSuppressed()) {
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163 TTY.println("IR for " + compilation.method);
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164 final InstructionPrinter ip = new InstructionPrinter(TTY.out());
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165 final BlockPrinter bp = new BlockPrinter(this, ip, cfgOnly);
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166 getHIRStartBlock().iteratePreOrder(bp);
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167 }
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168 }
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169
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170 /**
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171 * Verifies the IR and prints it out if the relevant options are set.
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172 * @param phase the name of the phase for printing
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173 */
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174 public void verifyAndPrint(String phase) {
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175 if (C1XOptions.PrintHIR && !TTY.isSuppressed()) {
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176 TTY.println(phase);
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177 print(false);
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178 }
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179
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180 if (compilation.compiler.isObserved()) {
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181 compilation.compiler.fireCompilationEvent(new CompilationEvent(compilation, phase, getHIRStartBlock(), true, false));
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182 }
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183 }
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184
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185 /**
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186 * Creates and inserts a new block between this block and the specified successor,
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187 * altering the successor and predecessor lists of involved blocks appropriately.
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188 * @param source the source of the edge
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189 * @param target the successor before which to insert a block
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190 * @return the new block inserted
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191 */
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192 public BlockBegin splitEdge(BlockBegin source, BlockBegin target) {
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193 int bci = -2;
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194
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195 int backEdgeIndex = target.predecessors().indexOf(source.end());
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196
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197 // create new successor and mark it for special block order treatment
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198 BlockBegin newSucc = new BlockBegin(bci, nextBlockNumber(), compilation.graph);
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199
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200 // This goto is not a safepoint.
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201 Goto e = new Goto(target, null, compilation.graph);
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202 newSucc.appendNext(e);
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203 e.reorderSuccessor(0, backEdgeIndex);
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204 // setup states
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205 FrameState s = source.end().stateAfter();
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206 newSucc.setStateBefore(s);
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207 e.setStateAfter(s);
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208 assert newSucc.stateBefore().localsSize() == s.localsSize();
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209 assert newSucc.stateBefore().stackSize() == s.stackSize();
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210 assert newSucc.stateBefore().locksSize() == s.locksSize();
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211 // link predecessor to new block
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212 source.end().substituteSuccessor(target, newSucc);
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213
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214 return newSucc;
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215 }
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216
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217 public void replaceBlock(BlockBegin oldBlock, BlockBegin newBlock) {
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218 List<Instruction> predecessors = new ArrayList<Instruction>(oldBlock.blockPredecessors());
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219 for (Instruction pred : predecessors) {
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220 // substitute the new successor for this block in each predecessor
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221 pred.block().end().substituteSuccessor(oldBlock, newBlock);
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222 }
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223 oldBlock.end().clearSuccessors();
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224 }
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225
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226 public int nextBlockNumber() {
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227 return compilation.stats.blockCount++;
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228 }
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229
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230 public int numberOfBlocks() {
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231 return compilation.stats.blockCount;
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232 }
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233
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234 public int numLoops() {
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235 return compilation.stats.loopCount;
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236 }
2564
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237
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238 /**
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239 * Updates the maximum number of locks held at any one time.
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240 *
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241 * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} if it is greater
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242 */
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243 public void updateMaxLocks(int locks) {
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244 if (locks > maxLocks) {
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245 maxLocks = locks;
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246 }
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247 }
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248
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249 /**
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250 * Gets the number of locks.
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251 * @return the number of locks
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252 */
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253 public final int maxLocks() {
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254 return maxLocks;
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255 }
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256
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257 public BlockBegin getHIRStartBlock() {
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258 return (BlockBegin) compilation.graph.start().successors().get(0);
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259 }
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260 }