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annotate graal/Compiler/src/com/sun/c1x/ir/BlockEnd.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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children
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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.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 }