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annotate graal/com.oracle.max.cri/src/com/sun/cri/bytecode/BytecodeSwitch.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
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.sun.cri.bytecode;
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24
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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 * The {@link BytecodeStream} containing bytecode array or {@code null} if {@link #code} is not {@code null}.
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32 */
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33 private final BytecodeStream stream;
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34 /**
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35 * The bytecode array or {@code null} if {@link #stream} is not {@code null}.
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36 */
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37 private final byte[] code;
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38 /**
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39 * Index of start of switch instruction.
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40 */
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41 protected final int bci;
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42 /**
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43 * Index of the start of the additional data for the switch instruction, aligned to a multiple of four from the method start.
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44 */
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45 protected final int alignedBci;
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46
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47 /**
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48 * Constructor for a {@link BytecodeStream}.
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49 * @param stream the {@code BytecodeStream} containing the switch instruction
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50 * @param bci the index in the stream of the switch instruction
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51 */
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52 public BytecodeSwitch(BytecodeStream stream, int bci) {
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53 this.alignedBci = (bci + 4) & 0xfffffffc;
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54 this.stream = stream;
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55 this.code = null;
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56 this.bci = bci;
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57 }
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58
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59 /**
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60 * Constructor for a bytecode array.
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61 * @param code the bytecode array containing the switch instruction.
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62 * @param bci the index in the array of the switch instruction
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63 */
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64 public BytecodeSwitch(byte[] code, int bci) {
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65 this.alignedBci = (bci + 4) & 0xfffffffc;
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66 this.stream = null;
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67 this.code = code;
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68 this.bci = bci;
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69 }
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70
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71 /**
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72 * Gets the current bytecode index.
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73 * @return the current bytecode index
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74 */
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75 public int bci() {
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76 return bci;
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77 }
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78
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79 /**
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80 * Gets the index of the instruction denoted by the {@code i}'th switch target.
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81 * @param i index of the switch target
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82 * @return the index of the instruction denoted by the {@code i}'th switch target
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83 */
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84 public int targetAt(int i) {
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85 return bci + offsetAt(i);
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86 }
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87
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88 /**
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89 * Gets the index of the instruction for the default switch target.
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90 * @return the index of the instruction for the default switch target
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91 */
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92 public int defaultTarget() {
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93 return bci + defaultOffset();
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94 }
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95
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96 /**
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97 * Gets the offset from the start of the switch instruction to the default switch target.
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98 * @return the offset to the default switch target
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99 */
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100 public abstract int defaultOffset();
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101
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102 /**
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103 * Gets the key at {@code i}'th switch target index.
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104 * @param i the switch target index
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105 * @return the key at {@code i}'th switch target index
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106 */
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107 public abstract int keyAt(int i);
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108
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109 /**
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110 * Gets the offset from the start of the switch instruction for the {@code i}'th switch target.
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111 * @param i the switch target index
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112 * @return the offset to the {@code i}'th switch target
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113 */
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114 public abstract int offsetAt(int i);
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115
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116 /**
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117 * Gets the number of switch targets.
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118 * @return the number of switch targets
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119 */
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120 public abstract int numberOfCases();
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121
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122 /**
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123 * Gets the total size in bytes of the switch instruction.
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124 * @return the total size in bytes of the switch instruction
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125 */
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126 public abstract int size();
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127
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128 /**
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129 * Reads the signed value at given bytecode index.
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130 * @param readBci the start index of the value to retrieve
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131 * @return the signed, 4-byte value in the bytecode array starting at {@code bci}
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132 */
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133 protected int readWord(int readBci) {
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134 if (code != null) {
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135 return Bytes.beS4(code, readBci);
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136 }
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137 return stream.readInt(readBci);
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138 }
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139 }