1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- G E T _ T A R G -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2019, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING3. If not, go to -- 19-- http://www.gnu.org/licenses for a complete copy of the license. -- 20-- -- 21-- GNAT was originally developed by the GNAT team at New York University. -- 22-- Extensive contributions were provided by Ada Core Technologies Inc. -- 23-- -- 24------------------------------------------------------------------------------ 25 26-- This package provides an Import to the C functions which provide 27-- values related to types on the target system. It is only needed for 28-- exp_dbug and the elaboration of ttypes, via the Set_Targs package. 29-- It also contains the routine for registering floating-point types. 30 31-- NOTE: Any changes in this package must be reflected in aa_getta.adb 32-- and any other version in the various back ends. 33 34-- Note that all these values return sizes of C types with corresponding 35-- names. This allows GNAT to define the corresponding Ada types to have 36-- the same representation. There is one exception to this general rule: 37-- the Wide_Character_Type uses twice the size of a C char, instead of the 38-- size of wchar_t. 39 40with Einfo; use Einfo; 41with Types; use Types; 42 43package Get_Targ is 44 45 -- Functions returning individual runtime values 46 47 function Get_Bits_Per_Unit return Pos; 48 -- System.Storage_Unit 49 50 function Get_Bits_Per_Word return Pos; 51 -- System.Word_Size 52 53 function Get_Char_Size return Pos; 54 -- Size of Standard.Character 55 56 function Get_Wchar_T_Size return Pos; 57 -- Size of Interfaces.C.wchar_t 58 59 function Get_Short_Size return Pos; 60 -- Size of Standard.Short_Integer 61 62 function Get_Int_Size return Pos; 63 -- Size of Standard.Integer 64 65 function Get_Long_Size return Pos; 66 -- Size of Standard.Long_Integer 67 68 function Get_Long_Long_Size return Pos; 69 -- Size of Standard.Long_Long_Integer 70 71 function Get_Pointer_Size return Pos; 72 -- Size of System.Address 73 74 function Get_Maximum_Alignment return Pos; 75 -- Maximum supported alignment 76 77 function Get_Float_Words_BE return Nat; 78 -- Non-zero iff float words big endian 79 80 function Get_Words_BE return Nat; 81 -- Non-zero iff integer words big endian 82 83 function Get_Bytes_BE return Nat; 84 -- Non-zero iff bytes big-endian 85 86 function Get_Bits_BE return Nat; 87 -- Non-zero iff bit order big endian 88 89 function Get_Strict_Alignment return Nat; 90 -- Non-zero if target requires strict alignent 91 92 function Get_System_Allocator_Alignment return Nat; 93 -- Alignment guaranteed by malloc falls 94 95 function Get_Double_Float_Alignment return Nat; 96 -- Alignment required for Long_Float or 0 if no special requirement 97 98 function Get_Double_Scalar_Alignment return Nat; 99 -- Alignment required for Long_Long_Integer or larger integer types 100 -- or 0 if no special requirement. 101 102 function Get_Short_Enums return Int; 103 -- Returns non-zero if we are in short enums mode, where foreign convention 104 -- (in particular C and C++) enumeration types will be sized as in Ada, 105 -- using the shortest possibility from 8,16,32 bits, signed or unsigned. 106 -- A zero value means Short_Enums are not in use, and in this case all 107 -- foreign convention enumeration types are given the same size as c int. 108 109 -- Other subprograms 110 111 function Get_Max_Unaligned_Field return Pos; 112 -- Returns the maximum supported size in bits for a field that is 113 -- not aligned on a storage unit boundary. 114 115 function Width_From_Size (Size : Pos) return Pos; 116 function Digits_From_Size (Size : Pos) return Pos; 117 -- Calculate values for 'Width or 'Digits from 'Size 118 119 type C_String is array (0 .. 255) of aliased Character; 120 pragma Convention (C, C_String); 121 122 type Register_Type_Proc is access procedure 123 (C_Name : C_String; -- Nul-terminated string with name of type 124 Digs : Natural; -- Digits for floating point, 0 otherwise 125 Complex : Boolean; -- True iff type has real and imaginary parts 126 Count : Natural; -- Number of elements in vector, 0 otherwise 127 Float_Rep : Float_Rep_Kind; -- Representation used for fpt type 128 Precision : Positive; -- Precision of representation in bits 129 Size : Positive; -- Size of representation in bits 130 Alignment : Natural); -- Required alignment in bits 131 pragma Convention (C, Register_Type_Proc); 132 -- Call back procedure for Register_Back_End_Types. This is to be used by 133 -- Create_Standard to create predefined types for all types supported by 134 -- the back end. 135 136 procedure Register_Back_End_Types (Call_Back : Register_Type_Proc); 137 -- Calls the Call_Back function with information for each supported type 138 139 function Get_Back_End_Config_File return String_Ptr; 140 -- Return the back end configuration file, or null if none. If non-null, 141 -- this file should be used instead of calling the various Get_xxx 142 -- functions in this package. 143 144end Get_Targ; 145