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annotate graal/GraalCompiler/src/com/sun/c1x/graph/IR.java @ 2708:4272b7af2d17

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merge
author Lukas Stadler <lukas.stadler@jku.at>
date Wed, 18 May 2011 18:40:58 +0200
parents 7ed72769d51a efbdb3ea95c9
children a0dd2b907806
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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 private int maxLocks;
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53
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54 /**
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55 * The linear-scan ordered list of blocks.
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56 */
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57 private List<BlockBegin> orderedBlocks;
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58
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59 /**
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60 * Creates a new IR instance for the specified compilation.
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61 * @param compilation the compilation
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62 */
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63 public IR(C1XCompilation compilation) {
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64 this.compilation = compilation;
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65 }
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66
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67 /**
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68 * Builds the graph, optimizes it, and computes the linear scan block order.
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69 */
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70 public void build() {
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71 if (C1XOptions.PrintTimers) {
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72 C1XTimers.HIR_CREATE.start();
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73 }
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74
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75 buildGraph();
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76
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77 if (C1XOptions.PrintTimers) {
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78 C1XTimers.HIR_CREATE.stop();
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79 C1XTimers.HIR_OPTIMIZE.start();
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80 }
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81
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82 computeLinearScanOrder();
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83
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84 if (C1XOptions.PrintTimers) {
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85 C1XTimers.HIR_OPTIMIZE.stop();
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86 }
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87 }
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88
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89 private void buildGraph() {
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90 // Graph builder must set the startBlock and the osrEntryBlock
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91 new GraphBuilder(compilation, this, compilation.graph).build();
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92 verifyAndPrint("After graph building");
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93
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94 if (C1XOptions.PrintCompilation) {
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95 TTY.print(String.format("%3d blocks | ", this.numberOfBlocks()));
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96 }
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97 }
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98
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99 private void computeLinearScanOrder() {
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100 if (C1XOptions.GenLIR) {
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101 makeLinearScanOrder();
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102 verifyAndPrint("After linear scan order");
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103 }
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104 }
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105
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106 private void makeLinearScanOrder() {
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107 if (orderedBlocks == null) {
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108 CriticalEdgeFinder finder = new CriticalEdgeFinder(this);
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109 startBlock.iteratePreOrder(finder);
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110 finder.splitCriticalEdges();
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111 ComputeLinearScanOrder computeLinearScanOrder = new ComputeLinearScanOrder(compilation.stats.blockCount, startBlock);
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112 orderedBlocks = computeLinearScanOrder.linearScanOrder();
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113 compilation.stats.loopCount = computeLinearScanOrder.numLoops();
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114 computeLinearScanOrder.printBlocks();
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115 }
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116 }
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117
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118 /**
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119 * Gets the linear scan ordering of blocks as a list.
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120 * @return the blocks in linear scan order
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121 */
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122 public List<BlockBegin> linearScanOrder() {
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123 return orderedBlocks;
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124 }
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125
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126 private void print(boolean cfgOnly) {
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127 if (!TTY.isSuppressed()) {
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128 TTY.println("IR for " + compilation.method);
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129 final InstructionPrinter ip = new InstructionPrinter(TTY.out());
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130 final BlockPrinter bp = new BlockPrinter(this, ip, cfgOnly);
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131 startBlock.iteratePreOrder(bp);
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132 }
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133 }
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134
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135 /**
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136 * Verifies the IR and prints it out if the relevant options are set.
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137 * @param phase the name of the phase for printing
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138 */
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139 public void verifyAndPrint(String phase) {
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140 if (C1XOptions.PrintHIR && !TTY.isSuppressed()) {
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141 TTY.println(phase);
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142 print(false);
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143 }
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144
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145 if (compilation.compiler.isObserved()) {
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146 compilation.compiler.fireCompilationEvent(new CompilationEvent(compilation, phase, startBlock, true, false));
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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 * Creates and inserts a new block between this block and the specified successor,
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152 * altering the successor and predecessor lists of involved blocks appropriately.
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153 * @param source the source of the edge
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154 * @param target the successor before which to insert a block
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155 * @return the new block inserted
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156 */
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157 public BlockBegin splitEdge(BlockBegin source, BlockBegin target) {
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158 int bci;
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159 if (target.blockPredecessors().size() == 1) {
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160 bci = target.bci();
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161 } else {
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162 bci = source.end().bci();
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163 }
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164
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165 int backEdgeIndex = target.predecessors().indexOf(source.end());
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166
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167 // create new successor and mark it for special block order treatment
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168 BlockBegin newSucc = new BlockBegin(bci, nextBlockNumber(), compilation.graph);
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169
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170 // This goto is not a safepoint.
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171 Goto e = new Goto(target, null, false, compilation.graph);
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172 newSucc.appendNext(e, bci);
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173 newSucc.setEnd(e);
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174 e.reorderSuccessor(0, backEdgeIndex);
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175 // setup states
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176 FrameState s = source.end().stateAfter();
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177 newSucc.setStateBefore(s);
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178 e.setStateAfter(s);
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179 assert newSucc.stateBefore().localsSize() == s.localsSize();
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180 assert newSucc.stateBefore().stackSize() == s.stackSize();
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181 assert newSucc.stateBefore().locksSize() == s.locksSize();
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182 // link predecessor to new block
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183 source.end().substituteSuccessor(target, newSucc);
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184
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185 return newSucc;
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186 }
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187
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188 public void replaceBlock(BlockBegin oldBlock, BlockBegin newBlock) {
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189 List<Instruction> predecessors = new ArrayList<Instruction>(oldBlock.blockPredecessors());
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190 for (Instruction pred : predecessors) {
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191 // substitute the new successor for this block in each predecessor
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192 pred.block().end().substituteSuccessor(oldBlock, newBlock);
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193 }
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194 oldBlock.end().clearSuccessors();
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195 }
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196
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197 public int nextBlockNumber() {
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198 return compilation.stats.blockCount++;
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199 }
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200
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201 public int numberOfBlocks() {
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202 return compilation.stats.blockCount;
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203 }
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204
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205 public int numLoops() {
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206 return compilation.stats.loopCount;
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207 }
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208
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209 /**
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210 * Updates the maximum number of locks held at any one time.
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211 *
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212 * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} if it is greater
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213 */
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214 public void updateMaxLocks(int locks) {
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215 if (locks > maxLocks) {
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216 maxLocks = locks;
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217 }
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218 }
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219
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220 /**
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221 * Gets the number of locks.
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222 * @return the number of locks
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223 */
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224 public final int maxLocks() {
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225 return maxLocks;
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226 }
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227 }