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annotate graal/com.oracle.max.cri/src/com/sun/cri/bytecode/BytecodeTableSwitch.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 * A utility for processing {@link Bytecodes#TABLESWITCH} bytecodes.
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27 */
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28 public class BytecodeTableSwitch extends BytecodeSwitch {
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29 private static final int OFFSET_TO_LOW_KEY = 4;
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30 private static final int OFFSET_TO_HIGH_KEY = 8;
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31 private static final int OFFSET_TO_FIRST_JUMP_OFFSET = 12;
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32 private static final int JUMP_OFFSET_SIZE = 4;
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33
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34 /**
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35 * Constructor for a {@link BytecodeStream}.
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36 * @param stream the {@code BytecodeStream} containing the switch instruction
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37 * @param bci the index in the stream of the switch instruction
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38 */
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39 public BytecodeTableSwitch(BytecodeStream stream, int bci) {
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40 super(stream, bci);
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41 }
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42
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43 /**
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44 * Constructor for a bytecode array.
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45 * @param code the bytecode array containing the switch instruction.
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46 * @param bci the index in the array of the switch instruction
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47 */
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48 public BytecodeTableSwitch(byte[] code, int bci) {
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49 super(code, bci);
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50 }
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51
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52 /**
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53 * Gets the low key of the table switch.
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54 * @return the low key
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55 */
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56 public int lowKey() {
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57 return readWord(alignedBci + OFFSET_TO_LOW_KEY);
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58 }
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59
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60 /**
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61 * Gets the high key of the table switch.
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62 * @return the high key
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63 */
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64 public int highKey() {
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65 return readWord(alignedBci + OFFSET_TO_HIGH_KEY);
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66 }
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67
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68 @Override
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69 public int keyAt(int i) {
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70 return lowKey() + i;
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71 }
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72
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73 @Override
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74 public int defaultOffset() {
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75 return readWord(alignedBci);
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76 }
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77
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78 @Override
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79 public int offsetAt(int i) {
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80 return readWord(alignedBci + OFFSET_TO_FIRST_JUMP_OFFSET + JUMP_OFFSET_SIZE * i);
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81 }
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82
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83 @Override
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84 public int numberOfCases() {
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85 return highKey() - lowKey() + 1;
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86 }
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87
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88 @Override
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89 public int size() {
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90 return alignedBci + OFFSET_TO_FIRST_JUMP_OFFSET + JUMP_OFFSET_SIZE * numberOfCases() - bci;
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91 }
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92 }