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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- G N A T . B Y T E _ S W A P P I N G --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 2006-2018, AdaCore --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This is a general implementation that uses GCC intrinsics to take
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33 -- advantage of any machine-specific instructions.
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34
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35 with Ada.Unchecked_Conversion; use Ada;
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36
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37 with System.Byte_Swapping; use System.Byte_Swapping;
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38
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39 package body GNAT.Byte_Swapping is
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40
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41 --------------
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42 -- Swapped2 --
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43 --------------
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44
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45 function Swapped2 (Input : Item) return Item is
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46 function As_U16 is new Unchecked_Conversion (Item, U16);
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47 function As_Item is new Unchecked_Conversion (U16, Item);
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48 pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 2,
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49 "storage size must be 2 bytes");
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50 begin
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51 return As_Item (Bswap_16 (As_U16 (Input)));
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52 end Swapped2;
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53
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54 --------------
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55 -- Swapped4 --
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56 --------------
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57
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58 function Swapped4 (Input : Item) return Item is
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59 function As_U32 is new Unchecked_Conversion (Item, U32);
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60 function As_Item is new Unchecked_Conversion (U32, Item);
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61 pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 4,
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62 "storage size must be 4 bytes");
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63 begin
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64 return As_Item (Bswap_32 (As_U32 (Input)));
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65 end Swapped4;
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66
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67 --------------
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68 -- Swapped8 --
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69 --------------
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70
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71 function Swapped8 (Input : Item) return Item is
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72 function As_U64 is new Unchecked_Conversion (Item, U64);
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73 function As_Item is new Unchecked_Conversion (U64, Item);
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74 pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 8,
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75 "storage size must be 8 bytes");
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76 begin
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77 return As_Item (Bswap_64 (As_U64 (Input)));
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78 end Swapped8;
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79
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80 -----------
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81 -- Swap2 --
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82 -----------
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83
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84 procedure Swap2 (Location : System.Address) is
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85 X : U16;
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86 for X'Address use Location;
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87 begin
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88 X := Bswap_16 (X);
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89 end Swap2;
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90
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91 -----------
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92 -- Swap4 --
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93 -----------
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94
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95 procedure Swap4 (Location : System.Address) is
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96 X : U32;
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97 for X'Address use Location;
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98 begin
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99 X := Bswap_32 (X);
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100 end Swap4;
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101
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102 -----------
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103 -- Swap8 --
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104 -----------
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105
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106 procedure Swap8 (Location : System.Address) is
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107 X : U64;
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108 for X'Address use Location;
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109 begin
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110 X := Bswap_64 (X);
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111 end Swap8;
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112
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113 end GNAT.Byte_Swapping;
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