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annotate druntime/src/compiler/dmd/arraycast.d @ 759:d3eb054172f9

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Added copy of druntime from DMD 2.020 modified for LDC.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Tue, 11 Nov 2008 01:52:37 +0100
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d3eb054172f9 Added copy of druntime from DMD 2.020 modified for LDC.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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1 /*
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2 * Copyright (C) 2004-2007 by Digital Mars, www.digitalmars.com
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3 * Written by Walter Bright
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4 *
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5 * This software is provided 'as-is', without any express or implied
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6 * warranty. In no event will the authors be held liable for any damages
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7 * arising from the use of this software.
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8 *
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9 * Permission is granted to anyone to use this software for any purpose,
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10 * including commercial applications, and to alter it and redistribute it
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11 * freely, in both source and binary form, subject to the following
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12 * restrictions:
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13 *
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14 * o The origin of this software must not be misrepresented; you must not
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15 * claim that you wrote the original software. If you use this software
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16 * in a product, an acknowledgment in the product documentation would be
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17 * appreciated but is not required.
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18 * o Altered source versions must be plainly marked as such, and must not
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19 * be misrepresented as being the original software.
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20 * o This notice may not be removed or altered from any source
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21 * distribution.
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22 */
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23
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24 /*
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25 * Modified by Sean Kelly for use with the D Runtime Project
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26 */
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27
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28 module rt.arraycast;
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29
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30 /******************************************
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31 * Runtime helper to convert dynamic array of one
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32 * type to dynamic array of another.
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33 * Adjusts the length of the array.
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34 * Throws exception if new length is not aligned.
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35 */
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36
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37 extern (C)
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38
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39 void[] _d_arraycast(size_t tsize, size_t fsize, void[] a)
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40 {
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41 auto length = a.length;
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42
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43 auto nbytes = length * fsize;
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44 if (nbytes % tsize != 0)
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45 {
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46 throw new Exception("array cast misalignment");
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47 }
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48 length = nbytes / tsize;
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49 *cast(size_t *)&a = length; // jam new length
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50 return a;
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51 }
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52
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53 unittest
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54 {
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55 byte[int.sizeof * 3] b;
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56 int[] i;
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57 short[] s;
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58
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59 i = cast(int[])b;
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60 assert(i.length == 3);
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61
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62 s = cast(short[])b;
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63 assert(s.length == 6);
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64
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65 s = cast(short[])i;
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66 assert(s.length == 6);
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67 }
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68
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69 /******************************************
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70 * Runtime helper to convert dynamic array of bits
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71 * dynamic array of another.
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72 * Adjusts the length of the array.
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73 * Throws exception if new length is not aligned.
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74 */
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75
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76 version (none)
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77 {
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78 extern (C)
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79
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80 void[] _d_arraycast_frombit(uint tsize, void[] a)
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81 {
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82 uint length = a.length;
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83
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84 if (length & 7)
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85 {
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86 throw new Exception("bit[] array cast misalignment");
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87 }
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88 length /= 8 * tsize;
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89 *cast(size_t *)&a = length; // jam new length
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90 return a;
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91 }
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92
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93 unittest
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94 {
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95 version (D_Bits)
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96 {
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97 bit[int.sizeof * 3 * 8] b;
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98 int[] i;
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99 short[] s;
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100
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101 i = cast(int[])b;
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102 assert(i.length == 3);
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103
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104 s = cast(short[])b;
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105 assert(s.length == 6);
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106 }
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107 }
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108
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109 }