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annotate graal/GraalCompiler/src/com/sun/c1x/graph/IR.java @ 2546:e1b3db8031ee

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Removed liveness marking.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 21:54:31 +0200
parents eca17668badf
children 274360f98f97
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2507
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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.observer.*;
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31 import com.sun.c1x.value.*;
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32
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33 /**
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34 * This class implements the overall container for the HIR (high-level IR) graph
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35 * and directs its construction, optimization, and finalization.
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36 *
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37 * @author Thomas Wuerthinger
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38 * @author Ben L. Titzer
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39 */
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40 public class IR {
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41
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42 /**
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43 * The compilation associated with this IR.
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44 */
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45 public final C1XCompilation compilation;
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46
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47 /**
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48 * The start block of this IR.
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49 */
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50 public BlockBegin startBlock;
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51
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52 /**
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53 * The entry block for an OSR compile.
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54 */
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55 public BlockBegin osrEntryBlock;
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56
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57 /**
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58 * The top IRScope.
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59 */
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60 public IRScope topScope;
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61
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62 /**
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63 * The linear-scan ordered list of blocks.
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64 */
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65 private List<BlockBegin> orderedBlocks;
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66
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67 /**
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68 * Creates a new IR instance for the specified compilation.
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69 * @param compilation the compilation
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70 */
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71 public IR(C1XCompilation compilation) {
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72 this.compilation = compilation;
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73 }
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74
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75 /**
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76 * Builds the graph, optimizes it, and computes the linear scan block order.
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77 */
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78 public void build() {
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79 if (C1XOptions.PrintTimers) {
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80 C1XTimers.HIR_CREATE.start();
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81 }
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82
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83 buildGraph();
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84
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85 if (C1XOptions.PrintTimers) {
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86 C1XTimers.HIR_CREATE.stop();
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87 C1XTimers.HIR_OPTIMIZE.start();
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88 }
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89
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90 computeLinearScanOrder();
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91
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92 if (C1XOptions.PrintTimers) {
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93 C1XTimers.HIR_OPTIMIZE.stop();
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94 }
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95 }
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96
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97 private void buildGraph() {
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98 topScope = new IRScope(null, null, compilation.method, -1);
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99
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100 // Graph builder must set the startBlock and the osrEntryBlock
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101 new GraphBuilder(compilation, this).build(topScope);
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102 assert startBlock != null;
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103 verifyAndPrint("After graph building");
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104
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105 if (C1XOptions.PrintCompilation) {
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106 TTY.print(String.format("%3d blocks | ", this.numberOfBlocks()));
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107 }
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108 }
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109
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110 private void computeLinearScanOrder() {
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111 if (C1XOptions.GenLIR) {
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112 makeLinearScanOrder();
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113 verifyAndPrint("After linear scan order");
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114 }
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115 }
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116
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117 private void makeLinearScanOrder() {
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118 if (orderedBlocks == null) {
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119 CriticalEdgeFinder finder = new CriticalEdgeFinder(this);
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120 startBlock.iteratePreOrder(finder);
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121 finder.splitCriticalEdges();
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122 ComputeLinearScanOrder computeLinearScanOrder = new ComputeLinearScanOrder(compilation.stats.blockCount, startBlock);
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123 orderedBlocks = computeLinearScanOrder.linearScanOrder();
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124 compilation.stats.loopCount = computeLinearScanOrder.numLoops();
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125 computeLinearScanOrder.printBlocks();
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126 }
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127 }
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128
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129 /**
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130 * Gets the linear scan ordering of blocks as a list.
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131 * @return the blocks in linear scan order
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132 */
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133 public List<BlockBegin> linearScanOrder() {
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134 return orderedBlocks;
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135 }
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136
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137 private void print(boolean cfgOnly) {
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138 if (!TTY.isSuppressed()) {
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139 TTY.println("IR for " + compilation.method);
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140 final InstructionPrinter ip = new InstructionPrinter(TTY.out());
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141 final BlockPrinter bp = new BlockPrinter(this, ip, cfgOnly);
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142 startBlock.iteratePreOrder(bp);
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143 }
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144 }
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145
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146 /**
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147 * Verifies the IR and prints it out if the relevant options are set.
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148 * @param phase the name of the phase for printing
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149 */
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150 public void verifyAndPrint(String phase) {
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151 printToTTY(phase);
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152
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153 if (compilation.compiler.isObserved()) {
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154 compilation.compiler.fireCompilationEvent(new CompilationEvent(compilation, phase, startBlock, true, false));
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155 }
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156 }
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157
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158 private void printToTTY(String phase) {
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159 if (C1XOptions.PrintHIR && !TTY.isSuppressed()) {
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160 TTY.println(phase);
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161 print(false);
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162 }
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163 }
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164
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165 /**
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166 * Creates and inserts a new block between this block and the specified successor,
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167 * altering the successor and predecessor lists of involved blocks appropriately.
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168 * @param source the source of the edge
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169 * @param target the successor before which to insert a block
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170 * @return the new block inserted
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171 */
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172 public BlockBegin splitEdge(BlockBegin source, BlockBegin target) {
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173 int bci;
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174 if (target.predecessors().size() == 1) {
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175 bci = target.bci();
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176 } else {
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177 bci = source.end().bci();
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178 }
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179
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180 // create new successor and mark it for special block order treatment
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181 BlockBegin newSucc = new BlockBegin(bci, nextBlockNumber());
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182
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183 newSucc.setCriticalEdgeSplit(true);
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184
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185 // This goto is not a safepoint.
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186 Goto e = new Goto(target, null, false);
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187 newSucc.setNext(e, bci);
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188 newSucc.setEnd(e);
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189 // setup states
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190 FrameState s = source.end().stateAfter();
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191 newSucc.setStateBefore(s);
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192 e.setStateAfter(s);
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193 assert newSucc.stateBefore().localsSize() == s.localsSize();
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194 assert newSucc.stateBefore().stackSize() == s.stackSize();
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195 assert newSucc.stateBefore().locksSize() == s.locksSize();
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196 // link predecessor to new block
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197 source.end().substituteSuccessor(target, newSucc);
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198
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199 // The ordering needs to be the same, so remove the link that the
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200 // set_end call above added and substitute the new_sux for this
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201 // block.
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202 target.removePredecessor(newSucc);
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203
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204 // the successor could be the target of a switch so it might have
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205 // multiple copies of this predecessor, so substitute the new_sux
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206 // for the first and delete the rest.
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207 List<BlockBegin> list = target.predecessors();
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208 int x = list.indexOf(source);
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209 assert x >= 0;
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210 list.set(x, newSucc);
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211 newSucc.addPredecessor(source);
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212 Iterator<BlockBegin> iterator = list.iterator();
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213 while (iterator.hasNext()) {
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214 if (iterator.next() == source) {
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215 iterator.remove();
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216 newSucc.addPredecessor(source);
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217 }
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218 }
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219 return newSucc;
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220 }
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221
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222 public void replaceBlock(BlockBegin oldBlock, BlockBegin newBlock) {
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223 assert !oldBlock.isExceptionEntry() : "cannot replace exception handler blocks (yet)";
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224 for (BlockBegin succ : oldBlock.end().successors()) {
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225 succ.removePredecessor(oldBlock);
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226 }
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227 for (BlockBegin pred : oldBlock.predecessors()) {
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228 // substitute the new successor for this block in each predecessor
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229 pred.end().substituteSuccessor(oldBlock, newBlock);
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230 // and add each predecessor to the successor
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231 newBlock.addPredecessor(pred);
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232 }
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233 // this block is now disconnected; remove all its incoming and outgoing edges
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234 oldBlock.predecessors().clear();
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235 oldBlock.end().successors().clear();
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236 }
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237
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238 /**
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239 * Disconnects the specified block from all other blocks.
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240 * @param block the block to remove from the graph
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241 */
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242 public void disconnectFromGraph(BlockBegin block) {
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243 for (BlockBegin p : block.predecessors()) {
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244 p.end().successors().remove(block);
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245 }
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246 for (BlockBegin s : block.end().successors()) {
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247 s.predecessors().remove(block);
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248 }
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249 }
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250
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251 public int nextBlockNumber() {
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252 return compilation.stats.blockCount++;
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253 }
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254
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255 public int numberOfBlocks() {
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256 return compilation.stats.blockCount;
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257 }
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258
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259 public int numLoops() {
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260 return compilation.stats.loopCount;
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261 }
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262 }