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annotate graal/GraalCompiler/src/com/sun/c1x/graph/IR.java @ 2781:bda5972a40a5

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remove unnecessary BlockBegin nodes in frontend
author Lukas Stadler <lukas.stadler@jku.at>
date Tue, 24 May 2011 15:31:52 +0200
parents 398b8fa5dc81
children 915456e4959e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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.graal.graph.*;
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28 import com.oracle.max.graal.schedule.*;
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29 import com.sun.c1x.*;
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30 import com.sun.c1x.debug.*;
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31 import com.sun.c1x.ir.*;
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32 import com.sun.c1x.lir.*;
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33 import com.sun.c1x.observer.*;
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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 public class IR {
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40
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41 /**
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42 * The compilation associated with this IR.
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43 */
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44 public final C1XCompilation compilation;
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45
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46 /**
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47 * The start block of this IR.
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48 */
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49 public LIRBlock startBlock;
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50
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51 private int maxLocks;
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52
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53 /**
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54 * The linear-scan ordered list of blocks.
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55 */
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56 private List<LIRBlock> orderedBlocks;
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57
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58 /**
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59 * Creates a new IR instance for the specified compilation.
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60 * @param compilation the compilation
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61 */
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62 public IR(C1XCompilation compilation) {
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63 this.compilation = compilation;
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64 }
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65
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66 public Map<Value, LIRBlock> valueToBlock;
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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 Schedule schedule = new Schedule(this.compilation.graph);
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84 List<Block> blocks = schedule.getBlocks();
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85 NodeMap<Block> nodeToBlock = schedule.getNodeToBlock();
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86 Map<Block, LIRBlock> map = new HashMap<Block, LIRBlock>();
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87 for (Block b : blocks) {
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88 map.put(b, new LIRBlock(b.blockID()));
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89 }
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90
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91 for (Block b : blocks) {
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92 for (Block succ : b.getSuccessors()) {
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93 map.get(b).blockSuccessors().add(map.get(succ));
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94 }
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95
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96 for (Block pred : b.getPredecessors()) {
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97 map.get(b).blockPredecessors().add(map.get(pred));
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98 }
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99 }
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100
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101 // TODO(tw): Schedule nodes within a block.
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102
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103
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104 valueToBlock = computeLinearScanOrder();
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105 verifyAndPrint("After linear scan order");
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106
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107 if (C1XOptions.PrintTimers) {
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108 C1XTimers.HIR_OPTIMIZE.stop();
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109 }
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110 }
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111
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112 private void buildGraph() {
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113 // Graph builder must set the startBlock and the osrEntryBlock
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114 new GraphBuilder(compilation, this, compilation.graph).build();
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115 verifyAndPrint("After graph building");
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116
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117 if (C1XOptions.PrintCompilation) {
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118 TTY.print(String.format("%3d blocks | ", this.numberOfBlocks()));
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119 }
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120 }
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121
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122 private Map<Value, LIRBlock> computeLinearScanOrder() {
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123 return makeLinearScanOrder();
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124 }
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125
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126 private Map<Value, LIRBlock> makeLinearScanOrder() {
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127
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128 Map<Value, LIRBlock> valueToBlock = new HashMap<Value, LIRBlock>();
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129
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130 if (orderedBlocks == null) {
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131 CriticalEdgeFinder finder = new CriticalEdgeFinder(this);
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132 ((BlockBegin) getHIRStartBlock()).iteratePreOrder(finder);
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133 finder.splitCriticalEdges();
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134 ComputeLinearScanOrder computeLinearScanOrder = new ComputeLinearScanOrder(compilation.stats.blockCount, (BlockBegin) getHIRStartBlock());
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135 List<BlockBegin> blocks = computeLinearScanOrder.linearScanOrder();
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136 orderedBlocks = new ArrayList<LIRBlock>();
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137
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138 int z = 0;
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139 for (BlockBegin bb : blocks) {
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Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
140 LIRBlock lirBlock = new LIRBlock(z);
2768
43ffa0e47a46 Towards removing stateAfter on BlockEnd.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2761
diff changeset
141 lirBlock.getInstructions().add(bb);
2759
b72e6638b9e6 Removed the link from BlockBegin to LIRBlock.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
142 valueToBlock.put(bb, lirBlock);
2718
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
143 lirBlock.setLinearScanNumber(bb.linearScanNumber());
2723
173067211acb Removed two more BlockBegin flags.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
144 // TODO(tw): Initialize LIRBlock.linearScanLoopHeader and LIRBlock.linearScanLoopEnd
2718
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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diff changeset
145 lirBlock.setStateBefore(bb.stateBefore());
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diff changeset
146 orderedBlocks.add(lirBlock);
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7e470e1cd3b6 Removed special casing for exception phis in LIRGenerator. Removed dependency between LIRBlock.blockID and BlockBegin.blockID.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2723
diff changeset
147 ++z;
2718
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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148 }
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149
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b72e6638b9e6 Removed the link from BlockBegin to LIRBlock.
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diff changeset
150 z = 0;
2718
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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diff changeset
151 for (BlockBegin bb : blocks) {
2759
b72e6638b9e6 Removed the link from BlockBegin to LIRBlock.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
152 LIRBlock lirBlock = orderedBlocks.get(z);
2719
ae1c50a03297 Fixed regression.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2718
diff changeset
153 for (int i = 0; i < bb.numberOfPreds(); ++i) {
2759
b72e6638b9e6 Removed the link from BlockBegin to LIRBlock.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
154 lirBlock.blockPredecessors().add(valueToBlock.get(bb.predAt(i).block()));
2718
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155 }
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Thomas Wuerthinger <thomas@wuerthinger.net>
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156
2773
27512ea6bbcb exception dispatch simplification:
Lukas Stadler <lukas.stadler@jku.at>
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diff changeset
157 BlockEnd end = bb.end();
27512ea6bbcb exception dispatch simplification:
Lukas Stadler <lukas.stadler@jku.at>
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diff changeset
158 for (int i = 0; i < end.blockSuccessorCount(); ++i) {
27512ea6bbcb exception dispatch simplification:
Lukas Stadler <lukas.stadler@jku.at>
parents: 2769
diff changeset
159 lirBlock.blockSuccessors().add(valueToBlock.get(end.blockSuccessor(i)));
2718
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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160 }
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161
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diff changeset
162 Instruction first = bb;
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Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
163 while (first != null) {
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
164 lirBlock.getInstructions().add(first);
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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diff changeset
165 first = first.next();
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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166 }
2759
b72e6638b9e6 Removed the link from BlockBegin to LIRBlock.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2756
diff changeset
167 ++z;
2718
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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diff changeset
168 }
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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169
2759
b72e6638b9e6 Removed the link from BlockBegin to LIRBlock.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
170 startBlock = valueToBlock.get(getHIRStartBlock());
2718
c1ce2a53d6c3 Attempt to remove dependency between backend and BlockBegin.
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diff changeset
171 assert startBlock != null;
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172 compilation.stats.loopCount = computeLinearScanOrder.numLoops();
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173 }
2759
b72e6638b9e6 Removed the link from BlockBegin to LIRBlock.
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diff changeset
174 return valueToBlock;
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175 }
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176
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177 /**
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178 * Gets the linear scan ordering of blocks as a list.
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179 * @return the blocks in linear scan order
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180 */
2718
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181 public List<LIRBlock> linearScanOrder() {
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182 return orderedBlocks;
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183 }
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184
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185 private void print(boolean cfgOnly) {
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186 if (!TTY.isSuppressed()) {
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187 TTY.println("IR for " + compilation.method);
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diff changeset
188 final InstructionPrinter ip = new InstructionPrinter(TTY.out());
2546
e1b3db8031ee Removed liveness marking.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2531
diff changeset
189 final BlockPrinter bp = new BlockPrinter(this, ip, cfgOnly);
2781
bda5972a40a5 remove unnecessary BlockBegin nodes in frontend
Lukas Stadler <lukas.stadler@jku.at>
parents: 2776
diff changeset
190 ((BlockBegin) getHIRStartBlock()).iteratePreOrder(bp);
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191 }
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192 }
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193
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194 /**
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195 * Verifies the IR and prints it out if the relevant options are set.
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196 * @param phase the name of the phase for printing
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197 */
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198 public void verifyAndPrint(String phase) {
2653
7c8ad40c1f88 No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2616
diff changeset
199 if (C1XOptions.PrintHIR && !TTY.isSuppressed()) {
7c8ad40c1f88 No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2616
diff changeset
200 TTY.println(phase);
7c8ad40c1f88 No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2616
diff changeset
201 print(false);
7c8ad40c1f88 No need for stateAfter on volatile field loads.
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parents: 2616
diff changeset
202 }
2507
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203
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diff changeset
204 if (compilation.compiler.isObserved()) {
2719
ae1c50a03297 Fixed regression.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2718
diff changeset
205 compilation.compiler.fireCompilationEvent(new CompilationEvent(compilation, phase, getHIRStartBlock(), true, false));
2507
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206 }
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207 }
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diff changeset
208
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diff changeset
209 /**
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parents:
diff changeset
210 * Creates and inserts a new block between this block and the specified successor,
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diff changeset
211 * altering the successor and predecessor lists of involved blocks appropriately.
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212 * @param source the source of the edge
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diff changeset
213 * @param target the successor before which to insert a block
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214 * @return the new block inserted
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215 */
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parents:
diff changeset
216 public BlockBegin splitEdge(BlockBegin source, BlockBegin target) {
2716
c1a9bf38da28 Removed bci from the Instruction class.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2712
diff changeset
217 int bci = -2;
2507
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diff changeset
218
2674
6ab73784566a * BlockBegin.predecessors changed to List<BlockEnd>
Lukas Stadler <lukas.stadler@jku.at>
parents: 2661
diff changeset
219 int backEdgeIndex = target.predecessors().indexOf(source.end());
6ab73784566a * BlockBegin.predecessors changed to List<BlockEnd>
Lukas Stadler <lukas.stadler@jku.at>
parents: 2661
diff changeset
220
2507
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diff changeset
221 // create new successor and mark it for special block order treatment
2768
43ffa0e47a46 Towards removing stateAfter on BlockEnd.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2761
diff changeset
222 BlockBegin newSucc = new BlockBegin(bci, nextBlockNumber(), false, compilation.graph);
2507
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diff changeset
223
2776
398b8fa5dc81 Removed stateAfter from BlockEnd class. Clean up.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2774
diff changeset
224 List<Integer> removePhiInputs = null;
2769
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
225 for (int i = backEdgeIndex + 1; i < target.predecessors().size(); ++i) {
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
226 if (target.predecessors().get(i) == source.end()) {
2776
398b8fa5dc81 Removed stateAfter from BlockEnd class. Clean up.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2774
diff changeset
227 if (removePhiInputs == null) {
398b8fa5dc81 Removed stateAfter from BlockEnd class. Clean up.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2774
diff changeset
228 removePhiInputs = new ArrayList<Integer>();
398b8fa5dc81 Removed stateAfter from BlockEnd class. Clean up.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2774
diff changeset
229 }
2769
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
230 removePhiInputs.add(i);
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
231 }
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
232 }
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
233
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diff changeset
234 // This goto is not a safepoint.
2774
93fd92c9f8b0 Removed usage of stateAfter on BlockEnd instructions.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2773
diff changeset
235 Goto e = new Goto(target, compilation.graph);
2716
c1a9bf38da28 Removed bci from the Instruction class.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2712
diff changeset
236 newSucc.appendNext(e);
2674
6ab73784566a * BlockBegin.predecessors changed to List<BlockEnd>
Lukas Stadler <lukas.stadler@jku.at>
parents: 2661
diff changeset
237 e.reorderSuccessor(0, backEdgeIndex);
2769
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
238
2507
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parents:
diff changeset
239 // link predecessor to new block
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parents:
diff changeset
240 source.end().substituteSuccessor(target, newSucc);
2776
398b8fa5dc81 Removed stateAfter from BlockEnd class. Clean up.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2774
diff changeset
241 if (removePhiInputs != null && removePhiInputs.size() > 0) {
2769
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
242
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
243 for (Node n : target.usages()) {
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
244 if (n instanceof Phi) {
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
245 Phi phi = (Phi) n;
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
246 int correction = 0;
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
247 for (int index : removePhiInputs) {
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
248 phi.removeInput(index - correction);
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
249 correction++;
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
250 }
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
251 }
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
252 }
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
253
dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
254 }
2507
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parents:
diff changeset
255
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
256 return newSucc;
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parents:
diff changeset
257 }
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parents:
diff changeset
258
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diff changeset
259 public int nextBlockNumber() {
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diff changeset
260 return compilation.stats.blockCount++;
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parents:
diff changeset
261 }
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parents:
diff changeset
262
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
263 public int numberOfBlocks() {
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parents:
diff changeset
264 return compilation.stats.blockCount;
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parents:
diff changeset
265 }
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parents:
diff changeset
266
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parents:
diff changeset
267 public int numLoops() {
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parents:
diff changeset
268 return compilation.stats.loopCount;
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
269 }
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2546
diff changeset
270
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2546
diff changeset
271 /**
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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272 * Updates the maximum number of locks held at any one time.
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273 *
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274 * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} if it is greater
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275 */
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276 public void updateMaxLocks(int locks) {
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277 if (locks > maxLocks) {
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278 maxLocks = locks;
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279 }
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280 }
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281
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282 /**
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283 * Gets the number of locks.
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284 * @return the number of locks
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285 */
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286 public final int maxLocks() {
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287 return maxLocks;
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288 }
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289
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290 public Instruction getHIRStartBlock() {
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291 return (Instruction) compilation.graph.start().successors().get(0);
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292 }
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293 }