Mercurial > hg > truffle
annotate graal/com.oracle.max.asm/src/com/oracle/max/asm/NumUtil.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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children | 681e969888a7 |
rev | line source |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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1 /* |
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2 * Copyright (c) 2011, 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.max.asm; |
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24 |
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25 /** |
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26 * A collection of static utility functions that check ranges of numbers. |
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27 */ |
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28 public class NumUtil { |
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29 public static boolean isShiftCount(int x) { |
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30 return 0 <= x && x < 32; |
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31 } |
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32 |
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33 /** |
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34 * Determines if a given {@code int} value is the range of unsigned byte |
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35 * values. |
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36 */ |
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37 public static boolean isUByte(int x) { |
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38 return (x & 0xff) == x; |
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39 } |
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40 |
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41 /** |
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42 * Determines if a given {@code int} value is the range of signed byte |
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43 * values. |
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44 */ |
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45 public static boolean isByte(int x) { |
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46 return (byte) x == x; |
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47 } |
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48 |
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49 /** |
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50 * Determines if a given {@code long} value is the range of unsigned byte |
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51 * values. |
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52 */ |
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53 public static boolean isUByte(long x) { |
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54 return (x & 0xffL) == x; |
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55 } |
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56 |
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57 /** |
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58 * Determines if a given {@code long} value is the range of signed byte |
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59 * values. |
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60 */ |
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61 public static boolean isByte(long l) { |
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62 return (byte) l == l; |
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63 } |
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64 |
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65 /** |
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66 * Determines if a given {@code long} value is the range of unsigned int |
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67 * values. |
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68 */ |
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69 public static boolean isUInt(long x) { |
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70 return (x & 0xffffffffL) == x; |
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71 } |
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72 |
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73 /** |
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74 * Determines if a given {@code long} value is the range of signed int |
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75 * values. |
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76 */ |
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77 public static boolean isInt(long l) { |
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78 return (int) l == l; |
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79 } |
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80 |
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81 /** |
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82 * Determines if a given {@code int} value is the range of signed short |
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83 * values. |
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84 */ |
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85 public static boolean isShort(int x) { |
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86 return (short) x == x; |
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87 } |
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88 |
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89 public static boolean isUShort(int s) { |
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90 return s == (s & 0xFFFF); |
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91 } |
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92 |
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93 public static boolean is32bit(long x) { |
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94 return -0x80000000L <= x && x < 0x80000000L; |
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95 } |
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96 |
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97 public static short safeToShort(int v) { |
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98 assert isShort(v); |
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99 return (short) v; |
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100 } |
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101 } |