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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 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 2002-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the implementation dependent sections of this file. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- GNAT was originally developed by the GNAT team at New York University. --
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32 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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33 -- --
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34 ------------------------------------------------------------------------------
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35
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36 -- Warning: declarations in this package are ambiguous with respect to the
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37 -- extra declarations that can be introduced into System using Extend_System.
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38 -- It is a good idea to avoid use clauses for this package.
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39
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40 pragma Compiler_Unit_Warning;
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41
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42 package System.Storage_Elements is
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43 pragma Pure;
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44 -- Note that we take advantage of the implementation permission to make
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45 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada 2005,
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46 -- this is Pure in any case (AI-362).
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47
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48 -- We also add the pragma Pure_Function to the operations in this package,
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49 -- because otherwise functions with parameters derived from Address are
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50 -- treated as non-pure by the back-end (see exp_ch6.adb). This is because
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51 -- in many cases such a parameter is used to hide read/out access to
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52 -- objects, and it would be unsafe to treat such functions as pure.
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53
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54 type Storage_Offset is range
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55 -(2 ** (Integer'(Standard'Address_Size) - 1)) ..
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56 +(2 ** (Integer'(Standard'Address_Size) - 1)) - Long_Long_Integer'(1);
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57 -- Note: the reason for the Long_Long_Integer qualification here is to
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58 -- avoid a bogus ambiguity when this unit is analyzed in an rtsfind
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59 -- context. It may be possible to remove this in the future, but it is
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60 -- certainly harmless in any case ???
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61
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62 subtype Storage_Count is Storage_Offset range 0 .. Storage_Offset'Last;
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63
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64 type Storage_Element is mod 2 ** Storage_Unit;
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65 for Storage_Element'Size use Storage_Unit;
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66
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67 pragma Universal_Aliasing (Storage_Element);
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68 -- This type is used by the expander to implement aggregate copy
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69
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70 type Storage_Array is
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71 array (Storage_Offset range <>) of aliased Storage_Element;
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72 for Storage_Array'Component_Size use Storage_Unit;
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73
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74 -- Address arithmetic
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75
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76 function "+" (Left : Address; Right : Storage_Offset) return Address;
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77 pragma Convention (Intrinsic, "+");
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78 pragma Inline_Always ("+");
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79 pragma Pure_Function ("+");
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80
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81 function "+" (Left : Storage_Offset; Right : Address) return Address;
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82 pragma Convention (Intrinsic, "+");
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83 pragma Inline_Always ("+");
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84 pragma Pure_Function ("+");
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85
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86 function "-" (Left : Address; Right : Storage_Offset) return Address;
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87 pragma Convention (Intrinsic, "-");
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88 pragma Inline_Always ("-");
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89 pragma Pure_Function ("-");
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90
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91 function "-" (Left, Right : Address) return Storage_Offset;
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92 pragma Convention (Intrinsic, "-");
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93 pragma Inline_Always ("-");
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94 pragma Pure_Function ("-");
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95
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96 function "mod"
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97 (Left : Address;
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98 Right : Storage_Offset) return Storage_Offset;
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99 pragma Convention (Intrinsic, "mod");
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100 pragma Inline_Always ("mod");
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101 pragma Pure_Function ("mod");
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102
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103 -- Conversion to/from integers
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104
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105 type Integer_Address is mod Memory_Size;
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106
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107 function To_Address (Value : Integer_Address) return Address;
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108 pragma Convention (Intrinsic, To_Address);
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109 pragma Inline_Always (To_Address);
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110 pragma Pure_Function (To_Address);
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111
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112 function To_Integer (Value : Address) return Integer_Address;
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113 pragma Convention (Intrinsic, To_Integer);
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114 pragma Inline_Always (To_Integer);
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115 pragma Pure_Function (To_Integer);
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116
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117 end System.Storage_Elements;
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