Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockEnd.java @ 2522:58c05e4c51e2
Removing two more HIR instructions.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 16:43:31 +0200 |
parents | 16b9a8b5ad39 |
children | e1ba5a93e997 |
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.sun.c1x.util.*; |
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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 * @author Ben L. Titzer |
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36 */ |
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37 public abstract class BlockEnd extends Instruction { |
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38 |
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39 BlockBegin begin; |
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40 final List<BlockBegin> successors; |
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41 FrameState stateAfter; |
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42 |
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43 /** |
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44 * Constructs a new block end with the specified value type. |
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45 * @param kind the type of the value produced by this instruction |
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46 * @param stateAfter the frame state at the end of this block |
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47 * @param isSafepoint {@code true} if this instruction is a safepoint instruction |
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48 * @param successors the list of successor blocks. If {@code null}, a new one will be created. |
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49 */ |
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50 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, List<BlockBegin> successors) { |
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51 super(kind); |
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52 this.successors = successors == null ? new ArrayList<BlockBegin>(2) : successors; |
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53 setStateAfter(stateAfter); |
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54 if (isSafepoint) { |
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55 setFlag(Value.Flag.IsSafepoint); |
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56 } |
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57 } |
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58 |
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59 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint) { |
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60 this(kind, stateAfter, isSafepoint, null); |
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61 } |
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62 |
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63 /** |
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64 * Gets the state after the end of this block. |
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65 */ |
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66 @Override |
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67 public FrameState stateAfter() { |
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68 return stateAfter; |
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69 } |
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70 |
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71 public void setStateAfter(FrameState state) { |
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72 stateAfter = state; |
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73 } |
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74 |
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75 /** |
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76 * Checks whether this instruction is a safepoint. |
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77 * @return {@code true} if this instruction is a safepoint |
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78 */ |
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79 public boolean isSafepoint() { |
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80 return checkFlag(Value.Flag.IsSafepoint); |
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81 } |
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82 |
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83 /** |
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84 * Gets the block begin associated with this block end. |
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85 * @return the beginning of this basic block |
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86 */ |
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87 public BlockBegin begin() { |
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88 return begin; |
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89 } |
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90 |
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91 /** |
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92 * Sets the basic block beginning for this block end. This should only |
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93 * be called from {@link BlockBegin}. |
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94 * |
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95 * @param block the beginning of this basic block |
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96 */ |
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97 void setBegin(BlockBegin block) { |
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98 begin = block; |
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99 } |
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100 |
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101 /** |
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102 * Substitutes a successor block in this block end's successor list. Note that |
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103 * this method updates all occurrences in the list. |
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104 * @param oldSucc the old successor to replace |
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105 * @param newSucc the new successor |
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106 */ |
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107 public void substituteSuccessor(BlockBegin oldSucc, BlockBegin newSucc) { |
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108 assert newSucc != null; |
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109 Util.replaceAllInList(oldSucc, newSucc, successors); |
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110 } |
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111 |
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112 /** |
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113 * Gets the successor corresponding to the default (fall through) case. |
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114 * @return the default successor |
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115 */ |
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116 public BlockBegin defaultSuccessor() { |
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117 return successors.get(successors.size() - 1); |
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118 } |
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119 |
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120 /** |
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121 * Searches for the specified successor and returns its index into the |
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122 * successor list if found. |
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123 * @param b the block to search for in the successor list |
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124 * @return the index of the block in the list if found; <code>-1</code> otherwise |
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125 */ |
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126 public int successorIndex(BlockBegin b) { |
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127 final int max = successors.size(); |
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128 for (int i = 0; i < max; i++) { |
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129 if (successors.get(i) == b) { |
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130 return i; |
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131 } |
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132 } |
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133 return -1; |
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134 } |
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135 |
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136 /** |
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137 * Gets this block end's list of successors. |
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138 * @return the successor list |
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139 */ |
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140 public List<BlockBegin> successors() { |
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141 return successors; |
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142 } |
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143 |
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144 /** |
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145 * Gets the successor at a specified index. |
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146 * @param index the index of the successor |
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147 * @return the successor |
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148 */ |
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149 public BlockBegin suxAt(int index) { |
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150 return successors.get(index); |
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151 } |
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152 } |