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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . S T O R A G E _ E L E M E N T S --
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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) 1992-2018, Free Software Foundation, Inc. --
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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 pragma Compiler_Unit_Warning;
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33
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34 with Ada.Unchecked_Conversion;
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35
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36 package body System.Storage_Elements is
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37
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38 pragma Suppress (All_Checks);
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39
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40 -- Conversion to/from address
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41
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42 -- Note qualification below of To_Address to avoid ambiguities systems
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43 -- where Address is a visible integer type.
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44
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45 function To_Address is
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46 new Ada.Unchecked_Conversion (Storage_Offset, Address);
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47 function To_Offset is
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48 new Ada.Unchecked_Conversion (Address, Storage_Offset);
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49
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50 -- Conversion to/from integers
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51
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52 -- These functions must be place first because they are inlined_always
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53 -- and are used and inlined in other subprograms defined in this unit.
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54
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55 ----------------
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56 -- To_Address --
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57 ----------------
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58
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59 function To_Address (Value : Integer_Address) return Address is
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60 begin
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61 return Address (Value);
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62 end To_Address;
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63
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64 ----------------
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65 -- To_Integer --
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66 ----------------
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67
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68 function To_Integer (Value : Address) return Integer_Address is
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69 begin
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70 return Integer_Address (Value);
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71 end To_Integer;
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72
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73 -- Address arithmetic
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74
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75 ---------
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76 -- "+" --
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77 ---------
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78
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79 function "+" (Left : Address; Right : Storage_Offset) return Address is
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80 begin
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81 return Storage_Elements.To_Address
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82 (To_Integer (Left) + To_Integer (To_Address (Right)));
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83 end "+";
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84
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85 function "+" (Left : Storage_Offset; Right : Address) return Address is
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86 begin
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87 return Storage_Elements.To_Address
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88 (To_Integer (To_Address (Left)) + To_Integer (Right));
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89 end "+";
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90
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91 ---------
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92 -- "-" --
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93 ---------
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94
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95 function "-" (Left : Address; Right : Storage_Offset) return Address is
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96 begin
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97 return Storage_Elements.To_Address
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98 (To_Integer (Left) - To_Integer (To_Address (Right)));
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99 end "-";
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100
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101 function "-" (Left, Right : Address) return Storage_Offset is
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102 begin
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103 return To_Offset (Storage_Elements.To_Address
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104 (To_Integer (Left) - To_Integer (Right)));
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105 end "-";
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106
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107 -----------
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108 -- "mod" --
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109 -----------
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110
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111 function "mod"
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112 (Left : Address;
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113 Right : Storage_Offset) return Storage_Offset
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114 is
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115 begin
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116 if Right > 0 then
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117 return Storage_Offset
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118 (To_Integer (Left) mod Integer_Address (Right));
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119
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120 -- The negative case makes no sense since it is a case of a mod where
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121 -- the left argument is unsigned and the right argument is signed. In
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122 -- accordance with the (spirit of the) permission of RM 13.7.1(16),
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123 -- we raise CE, and also include the zero case here. Yes, the RM says
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124 -- PE, but this really is so obviously more like a constraint error.
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125
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126 else
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127 raise Constraint_Error;
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128 end if;
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129 end "mod";
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130
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131 end System.Storage_Elements;
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