Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.max.cri/src/com/sun/cri/bytecode/BytecodeTableSwitch.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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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 } |