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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 -- G E T _ T A R G --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
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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. See the GNU General Public License --
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17 -- for more details. You should have received a copy of the GNU General --
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18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
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19 -- http://www.gnu.org/licenses for a complete copy of the license. --
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20 -- --
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21 -- GNAT was originally developed by the GNAT team at New York University. --
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22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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23 -- --
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24 ------------------------------------------------------------------------------
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25
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26 -- This package provides an Import to the C functions which provide
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27 -- values related to types on the target system. It is only needed for
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28 -- exp_dbug and the elaboration of ttypes, via the Set_Targs package.
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29 -- It also contains the routine for registering floating-point types.
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30
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31 -- NOTE: Any changes in this package must be reflected in aa_getta.adb
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32 -- and any other version in the various back ends.
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33
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34 -- Note that all these values return sizes of C types with corresponding
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35 -- names. This allows GNAT to define the corresponding Ada types to have
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36 -- the same representation. There is one exception to this general rule:
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37 -- the Wide_Character_Type uses twice the size of a C char, instead of the
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38 -- size of wchar_t.
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39
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40 with Einfo; use Einfo;
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41 with Types; use Types;
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42
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43 package Get_Targ is
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44
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45 -- Functions returning individual runtime values
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46
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47 function Get_Bits_Per_Unit return Pos;
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48 -- System.Storage_Unit
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49
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50 function Get_Bits_Per_Word return Pos;
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51 -- System.Word_Size
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52
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53 function Get_Char_Size return Pos;
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54 -- Size of Standard.Character
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55
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56 function Get_Wchar_T_Size return Pos;
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57 -- Size of Interfaces.C.wchar_t
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58
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59 function Get_Short_Size return Pos;
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60 -- Size of Standard.Short_Integer
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61
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62 function Get_Int_Size return Pos;
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63 -- Size of Standard.Integer
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64
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65 function Get_Long_Size return Pos;
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66 -- Size of Standard.Long_Integer
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67
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68 function Get_Long_Long_Size return Pos;
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69 -- Size of Standard.Long_Long_Integer
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70
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71 function Get_Pointer_Size return Pos;
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72 -- Size of System.Address
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73
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74 function Get_Maximum_Alignment return Pos;
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75 -- Maximum supported alignment
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76
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77 function Get_Float_Words_BE return Nat;
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78 -- Non-zero iff float words big endian
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79
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80 function Get_Words_BE return Nat;
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81 -- Non-zero iff integer words big endian
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82
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83 function Get_Bytes_BE return Nat;
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84 -- Non-zero iff bytes big-endian
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85
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86 function Get_Bits_BE return Nat;
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87 -- Non-zero iff bit order big endian
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88
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89 function Get_Strict_Alignment return Nat;
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90 -- Non-zero if target requires strict alignent
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91
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92 function Get_System_Allocator_Alignment return Nat;
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93 -- Alignment guaranteed by malloc falls
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94
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95 function Get_Double_Float_Alignment return Nat;
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96 -- Alignment required for Long_Float or 0 if no special requirement
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97
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98 function Get_Double_Scalar_Alignment return Nat;
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99 -- Alignment required for Long_Long_Integer or larger integer types
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100 -- or 0 if no special requirement.
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101
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102 function Get_Short_Enums return Int;
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103 -- Returns non-zero if we are in short enums mode, where foreign convention
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104 -- (in particular C and C++) enumeration types will be sized as in Ada,
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105 -- using the shortest possibility from 8,16,32 bits, signed or unsigned.
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106 -- A zero value means Short_Enums are not in use, and in this case all
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107 -- foreign convention enumeration types are given the same size as c int.
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108
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109 -- Other subprograms
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110
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111 function Get_Max_Unaligned_Field return Pos;
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112 -- Returns the maximum supported size in bits for a field that is
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113 -- not aligned on a storage unit boundary.
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114
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115 function Width_From_Size (Size : Pos) return Pos;
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116 function Digits_From_Size (Size : Pos) return Pos;
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117 -- Calculate values for 'Width or 'Digits from 'Size
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118
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119 type C_String is array (0 .. 255) of aliased Character;
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120 pragma Convention (C, C_String);
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121
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122 type Register_Type_Proc is access procedure
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123 (C_Name : C_String; -- Nul-terminated string with name of type
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124 Digs : Natural; -- Digits for floating point, 0 otherwise
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125 Complex : Boolean; -- True iff type has real and imaginary parts
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126 Count : Natural; -- Number of elements in vector, 0 otherwise
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127 Float_Rep : Float_Rep_Kind; -- Representation used for fpt type
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128 Precision : Positive; -- Precision of representation in bits
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129 Size : Positive; -- Size of representation in bits
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130 Alignment : Natural); -- Required alignment in bits
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131 pragma Convention (C, Register_Type_Proc);
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132 -- Call back procedure for Register_Back_End_Types. This is to be used by
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133 -- Create_Standard to create predefined types for all types supported by
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134 -- the back end.
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135
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136 procedure Register_Back_End_Types (Call_Back : Register_Type_Proc);
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137 -- Calls the Call_Back function with information for each supported type
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138
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139 function Get_Back_End_Config_File return String_Ptr;
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140 -- Return the back end configuration file, or null if none. If non-null,
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141 -- this file should be used instead of calling the various Get_xxx
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142 -- functions in this package.
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143
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144 end Get_Targ;
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