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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Instruction.java @ 2741:a3cd5eb68837

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more GraphBuilder cleanup, moved mergeOrClone to GraphBuilder
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 20 May 2011 11:11:33 +0200
parents c1a9bf38da28
children bfcdda4fdd73
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 2010, 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 com.oracle.graal.graph.*;
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26 import com.sun.c1x.*;
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27 import com.sun.c1x.value.*;
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28 import com.sun.cri.ci.*;
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29
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30 /**
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31 * Denotes an instruction node in the IR, which is a {@link Value} that
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32 * can be added to a basic block (whereas other {@link Value} nodes such as {@link Phi} and
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33 * {@link Local} cannot be added to basic blocks).
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34 *
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35 * Subclasses of instruction represent arithmetic and object operations,
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36 * control flow operators, phi statements, method calls, the start of basic blocks, and
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37 * the end of basic blocks.
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38 *
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39 * Instruction nodes are chained together in a basic block through the embedded
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40 * {@link Instruction#next} field. An Instruction may also have a list of {@link ExceptionHandler}s.
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41 */
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42 public abstract class Instruction extends Value {
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43
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44 private static final int INPUT_COUNT = 0;
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45
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46 private static final int SUCCESSOR_COUNT = 1;
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47 private static final int SUCCESSOR_NEXT = 0;
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48
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49 @Override
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50 protected int inputCount() {
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51 return super.inputCount() + INPUT_COUNT;
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52 }
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53
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54 @Override
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55 protected int successorCount() {
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56 return super.successorCount() + SUCCESSOR_COUNT;
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57 }
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58
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59 /**
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60 * Links to next instruction in a basic block, to {@code null} if this instruction is the end of a basic block or to
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61 * itself if not in a block.
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62 */
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63 public Instruction next() {
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64 return (Instruction) successors().get(super.successorCount() + SUCCESSOR_NEXT);
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65 }
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66
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67 private Node setNext(Instruction next) {
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68 return successors().set(super.successorCount() + SUCCESSOR_NEXT, next);
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69 }
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70
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71
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72 public static final int SYNCHRONIZATION_ENTRY_BCI = -1;
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73
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74 private boolean isAppended = false;
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75
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76 /**
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77 * Constructs a new instruction with the specified value type.
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78 * @param kind the value type for this instruction
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79 * @param inputCount
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80 * @param successorCount
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81 */
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82 public Instruction(CiKind kind, int inputCount, int successorCount, Graph graph) {
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83 super(kind, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph);
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84 C1XMetrics.HIRInstructions++;
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85 }
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86
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87 /**
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88 * Checks whether this instruction has already been added to its basic block.
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89 * @return {@code true} if this instruction has been added to the basic block containing it
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90 */
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91 public final boolean isAppended() {
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92 return isAppended;
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93 }
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94
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95
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96 /**
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97 * Sets the next instruction for this instruction. Note that it is illegal to
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98 * set the next field of a phi, block end, or local instruction.
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99 * @param next the next instruction
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100 * @param bci the bytecode index of the next instruction
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101 * @return the new next instruction
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102 */
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103 public final Instruction appendNext(Instruction next) {
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104 setNext(next);
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105 if (next != null) {
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106 assert !(this instanceof BlockEnd);
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107 next.isAppended = true;
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108 }
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109 return next;
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110 }
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111
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112 @Override
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113 public BlockBegin block() {
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114 Instruction cur = this;
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115 while (!(cur instanceof BlockEnd)) {
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116 cur = cur.next();
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117 }
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118 return ((BlockEnd) cur).begin();
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119 }
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120
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121 /**
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122 * Compute the value number of this Instruction. Local and global value numbering
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123 * optimizations use a hash map, and the value number provides a hash code.
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124 * If the instruction cannot be value numbered, then this method should return
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125 * {@code 0}.
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126 * @return the hashcode of this instruction
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127 */
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128 public int valueNumber() {
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129 return 0;
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130 }
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131
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132 /**
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133 * Checks that this instruction is equal to another instruction for the purposes
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134 * of value numbering.
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135 * @param i the other instruction
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136 * @return {@code true} if this instruction is equivalent to the specified
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137 * instruction w.r.t. value numbering
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138 */
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139 public boolean valueEqual(Instruction i) {
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140 return false;
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141 }
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142
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143 /**
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144 * Gets the state after the instruction, if it is recorded. Typically only
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145 * instances of {@link BlockEnd} have a non-null state after.
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146 * @return the state after the instruction
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147 */
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148 public FrameState stateAfter() {
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149 return null;
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150 }
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151 }