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annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockEnd.java @ 2616:3558ca7088c0

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FrameState and Graphviz changes: * removed popx, pushx methods from GraphBuilder * FrameState subclass of Value * added String shortName() to Node * added GraphvizPrinter option to use short names * small hack in GraphvizPrinter: omit FrameState->Local connections * added GraalGraphviz to implicit classpatch (read from GRAAL env var)
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 09 May 2011 17:00:25 +0200
parents 0c6564c254af
children dd115f80acf8
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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.ir;
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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.sun.c1x.value.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 * The {@code BlockEnd} instruction is a base class for all instructions that end a basic
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33 * block, including branches, switches, throws, and goto's.
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34 */
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35 public abstract class BlockEnd extends Instruction {
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36
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37 private static final int INPUT_COUNT = 1;
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38 private static final int INPUT_STATE_AFTER = 0;
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39
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40 private final int blockSuccessorCount;
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41
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42 @Override
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43 protected int inputCount() {
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44 return super.inputCount() + INPUT_COUNT;
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45 }
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46
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47 @Override
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48 protected int successorCount() {
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49 return super.successorCount() + blockSuccessorCount;
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50 }
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51
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52 /**
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53 * The state for this instruction.
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54 */
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55 @Override
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56 public FrameState stateAfter() {
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57 return (FrameState) inputs().get(super.inputCount() + INPUT_STATE_AFTER);
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58 }
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59
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60 public FrameState setStateAfter(FrameState n) {
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61 return (FrameState) inputs().set(super.inputCount() + INPUT_STATE_AFTER, n);
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62 }
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63 /**
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64 * The list of instructions that produce input for this instruction.
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65 */
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66 public BlockBegin blockSuccessor(int index) {
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67 assert index >= 0 && index < blockSuccessorCount;
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68 return (BlockBegin) successors().get(super.successorCount() + index);
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69 }
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70
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71 public BlockBegin setBlockSuccessor(int index, BlockBegin n) {
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72 assert index >= 0 && index < blockSuccessorCount;
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73 return (BlockBegin) successors().set(super.successorCount() + index, n);
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74 }
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75
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76 public int blockSuccessorCount() {
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77 return blockSuccessorCount;
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78 }
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79
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80 BlockBegin begin;
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81 boolean isSafepoint;
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82
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83 /**
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84 * Constructs a new block end with the specified value type.
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85 * @param kind the type of the value produced by this instruction
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86 * @param stateAfter the frame state at the end of this block
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87 * @param isSafepoint {@code true} if this instruction is a safepoint instruction
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88 * @param successors the list of successor blocks. If {@code null}, a new one will be created.
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89 */
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90 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, List<BlockBegin> blockSuccessors, int inputCount, int successorCount, Graph graph) {
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91 this(kind, stateAfter, isSafepoint, blockSuccessors.size(), inputCount, successorCount, graph);
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92 for (int i = 0; i < blockSuccessors.size(); i++) {
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93 setBlockSuccessor(i, blockSuccessors.get(i));
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94 }
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95 }
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96
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97 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, int blockSuccessorCount, int inputCount, int successorCount, Graph graph) {
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98 super(kind, inputCount + INPUT_COUNT, successorCount + blockSuccessorCount, graph);
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99 this.blockSuccessorCount = blockSuccessorCount;
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100 setStateAfter(stateAfter);
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101 this.isSafepoint = isSafepoint;
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102 }
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103
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104 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, Graph graph) {
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105 this(kind, stateAfter, isSafepoint, 2, 0, 0, graph);
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106 }
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107
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108 /**
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109 * Checks whether this instruction is a safepoint.
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110 * @return {@code true} if this instruction is a safepoint
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111 */
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112 public boolean isSafepoint() {
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113 return isSafepoint;
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114 }
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115
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116 /**
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117 * Gets the block begin associated with this block end.
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118 * @return the beginning of this basic block
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119 */
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120 public BlockBegin begin() {
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121 return begin;
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122 }
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123
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124 /**
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125 * Sets the basic block beginning for this block end. This should only
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126 * be called from {@link BlockBegin}.
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127 *
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128 * @param block the beginning of this basic block
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129 */
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130 void setBegin(BlockBegin block) {
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131 begin = block;
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132 }
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133
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134 /**
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135 * Substitutes a successor block in this block end's successor list. Note that
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136 * this method updates all occurrences in the list.
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137 * @param oldSucc the old successor to replace
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138 * @param newSucc the new successor
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139 */
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140 public void substituteSuccessor(BlockBegin oldSucc, BlockBegin newSucc) {
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141 assert newSucc != null;
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142 for (int i = 0; i < blockSuccessorCount; i++) {
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143 if (blockSuccessor(i) == oldSucc) {
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144 setBlockSuccessor(i, newSucc);
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145 }
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146 }
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147 }
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148
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149 /**
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150 * Gets the successor corresponding to the default (fall through) case.
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151 * @return the default successor
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152 */
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153 public BlockBegin defaultSuccessor() {
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154 return blockSuccessor(blockSuccessorCount - 1);
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155 }
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156
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157 /**
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158 * Searches for the specified successor and returns its index into the
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159 * successor list if found.
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160 * @param b the block to search for in the successor list
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161 * @return the index of the block in the list if found; <code>-1</code> otherwise
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162 */
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163 public int successorIndex(BlockBegin b) {
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164 for (int i = 0; i < blockSuccessorCount; i++) {
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165 if (blockSuccessor(i) == b) {
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166 return i;
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167 }
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168 }
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169 return -1;
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170 }
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171
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172 /**
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173 * Gets this block end's list of successors.
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174 * @return the successor list
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175 */
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176 public List<BlockBegin> blockSuccessors() {
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177 List<BlockBegin> list = (List) successors().subList(super.successorCount(), super.successorCount() + blockSuccessorCount);
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178 return Collections.unmodifiableList(list);
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179 }
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180
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181 }