Mercurial > projects > ldc
annotate druntime/src/compiler/dmd/arraycast.d @ 1458:e0b2d67cfe7c
Added druntime (this should be removed once it works).
author | Robert Clipsham <robert@octarineparrot.com> |
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date | Tue, 02 Jun 2009 17:43:06 +0100 |
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1458
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1 /** |
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2 * Implementation of array cast support routines. |
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3 * |
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4 * Copyright: Copyright Digital Mars 2004 - 2009. |
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5 * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>. |
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6 * Authors: Walter Bright, Sean Kelly |
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7 * |
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8 * Copyright Digital Mars 2004 - 2009. |
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9 * Distributed under the Boost Software License, Version 1.0. |
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10 * (See accompanying file LICENSE_1_0.txt or copy at |
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11 * http://www.boost.org/LICENSE_1_0.txt) |
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12 */ |
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13 module rt.arraycast; |
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14 |
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15 /****************************************** |
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16 * Runtime helper to convert dynamic array of one |
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17 * type to dynamic array of another. |
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18 * Adjusts the length of the array. |
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19 * Throws exception if new length is not aligned. |
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20 */ |
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21 |
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22 extern (C) |
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23 |
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24 void[] _d_arraycast(size_t tsize, size_t fsize, void[] a) |
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25 { |
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26 auto length = a.length; |
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27 |
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28 auto nbytes = length * fsize; |
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29 if (nbytes % tsize != 0) |
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30 { |
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31 throw new Exception("array cast misalignment"); |
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32 } |
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33 length = nbytes / tsize; |
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34 *cast(size_t *)&a = length; // jam new length |
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35 return a; |
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36 } |
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37 |
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38 unittest |
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39 { |
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40 byte[int.sizeof * 3] b; |
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41 int[] i; |
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42 short[] s; |
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43 |
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44 i = cast(int[])b; |
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45 assert(i.length == 3); |
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46 |
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47 s = cast(short[])b; |
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48 assert(s.length == 6); |
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49 |
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50 s = cast(short[])i; |
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51 assert(s.length == 6); |
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52 } |
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53 |
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54 /****************************************** |
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55 * Runtime helper to convert dynamic array of bits |
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56 * dynamic array of another. |
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57 * Adjusts the length of the array. |
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58 * Throws exception if new length is not aligned. |
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59 */ |
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60 |
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61 version (none) |
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62 { |
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63 extern (C) |
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64 |
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65 void[] _d_arraycast_frombit(uint tsize, void[] a) |
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66 { |
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67 uint length = a.length; |
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68 |
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69 if (length & 7) |
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70 { |
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71 throw new Exception("bit[] array cast misalignment"); |
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72 } |
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73 length /= 8 * tsize; |
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74 *cast(size_t *)&a = length; // jam new length |
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75 return a; |
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76 } |
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77 |
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78 unittest |
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79 { |
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80 version (D_Bits) |
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81 { |
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82 bit[int.sizeof * 3 * 8] b; |
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83 int[] i; |
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84 short[] s; |
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85 |
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86 i = cast(int[])b; |
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87 assert(i.length == 3); |
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88 |
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89 s = cast(short[])b; |
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90 assert(s.length == 6); |
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91 } |
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92 } |
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93 |
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94 } |