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annotate graal/com.oracle.jvmci.bytecode/src/com/oracle/jvmci/bytecode/BytecodeSwitch.java @ 21713:454a99ca00a9

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fixed canonicalizeprojects issues
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Jun 2015 22:13:10 +0200
parents graal/com.oracle.jvmci.bytecode/src/com/oracle/graal/bytecode/BytecodeSwitch.java@1c41d00e6b2f
children
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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.oracle.jvmci.bytecode;
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25 /**
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26 * An abstract class that provides the state and methods common to {@link Bytecodes#LOOKUPSWITCH}
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27 * and {@link Bytecodes#TABLESWITCH} instructions.
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28 */
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29 public abstract class BytecodeSwitch {
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30
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31 /**
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32 * The {@link BytecodeStream} containing the bytecode array.
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33 */
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34 protected final BytecodeStream stream;
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35 /**
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36 * Index of start of switch instruction.
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37 */
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38 protected final int bci;
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39 /**
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40 * Index of the start of the additional data for the switch instruction, aligned to a multiple
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41 * of four from the method start.
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42 */
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43 protected final int alignedBci;
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44
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45 /**
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46 * Constructor for a {@link BytecodeStream}.
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47 *
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48 * @param stream the {@code BytecodeStream} containing the switch instruction
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49 * @param bci the index in the stream of the switch instruction
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50 */
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51 public BytecodeSwitch(BytecodeStream stream, int bci) {
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52 this.stream = stream;
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53 this.bci = bci;
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54 this.alignedBci = (bci + 4) & 0xfffffffc;
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55 }
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56
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57 /**
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58 * Gets the current bytecode index.
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59 *
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60 * @return the current bytecode index
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61 */
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62 public int bci() {
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63 return bci;
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64 }
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65
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66 /**
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67 * Gets the index of the instruction denoted by the {@code i}'th switch target.
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68 *
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69 * @param i index of the switch target
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70 * @return the index of the instruction denoted by the {@code i}'th switch target
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71 */
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72 public int targetAt(int i) {
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73 return bci + offsetAt(i);
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74 }
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75
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76 /**
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77 * Gets the index of the instruction for the default switch target.
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78 *
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79 * @return the index of the instruction for the default switch target
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80 */
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81 public int defaultTarget() {
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82 return bci + defaultOffset();
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83 }
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84
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85 /**
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86 * Gets the offset from the start of the switch instruction to the default switch target.
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87 *
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88 * @return the offset to the default switch target
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89 */
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90 public int defaultOffset() {
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91 return stream.readInt(alignedBci);
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92 }
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93
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94 /**
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95 * Gets the key at {@code i}'th switch target index.
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96 *
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97 * @param i the switch target index
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98 * @return the key at {@code i}'th switch target index
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99 */
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100 public abstract int keyAt(int i);
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101
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102 /**
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103 * Gets the offset from the start of the switch instruction for the {@code i}'th switch target.
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104 *
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105 * @param i the switch target index
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106 * @return the offset to the {@code i}'th switch target
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107 */
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108 public abstract int offsetAt(int i);
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109
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110 /**
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111 * Gets the number of switch targets.
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112 *
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113 * @return the number of switch targets
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114 */
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115 public abstract int numberOfCases();
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116
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117 /**
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118 * Gets the total size in bytes of the switch instruction.
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119 *
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120 * @return the total size in bytes of the switch instruction
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121 */
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122 public abstract int size();
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123
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124 }