1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- B A C K _ E N D -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2011, 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-- Call the back end with all the information needed. Also contains other 27-- back-end specific interfaces required by the front end. 28 29with Einfo; use Einfo; 30 31package Back_End is 32 33 type Back_End_Mode_Type is ( 34 Generate_Object, 35 -- Full back end operation with object file generation 36 37 Declarations_Only, 38 -- Partial back end operation with no object file generation. In this 39 -- mode the only useful action performed by gigi is to process all 40 -- declarations issuing any error messages (in particular those to 41 -- do with rep clauses), and to back annotate representation info. 42 43 Skip); 44 -- Back end call is skipped (syntax only, or errors found) 45 46 pragma Convention (C, Back_End_Mode_Type); 47 for Back_End_Mode_Type use (0, 1, 2); 48 49 type C_String is array (0 .. 255) of aliased Character; 50 pragma Convention (C, C_String); 51 52 type Register_Type_Proc is access procedure 53 (C_Name : C_String; -- Nul-terminated string with name of type 54 Digs : Natural; -- Nr or digits for floating point, 0 otherwise 55 Complex : Boolean; -- True iff type has real and imaginary parts 56 Count : Natural; -- Number of elements in vector, 0 otherwise 57 Float_Rep : Float_Rep_Kind; -- Representation used for fpt type 58 Precision : Positive; -- Precision of representation in bits 59 Size : Positive; -- Size of representation in bits 60 Alignment : Natural); -- Required alignment in bits 61 pragma Convention (C, Register_Type_Proc); 62 -- Call back procedure for Register_Back_End_Types. This is to be used by 63 -- Create_Standard to create predefined types for all types supported by 64 -- the back end. 65 66 procedure Register_Back_End_Types (Call_Back : Register_Type_Proc); 67 -- Calls the Call_Back function with information for each supported type. 68 69 procedure Call_Back_End (Mode : Back_End_Mode_Type); 70 -- Call back end, i.e. make call to driver traversing the tree and 71 -- outputting code. This call is made with all tables locked. 72 -- The back end is responsible for unlocking any tables it may need 73 -- to change, and locking them again before returning. 74 75 procedure Scan_Compiler_Arguments; 76 -- Acquires command-line parameters passed to the compiler and processes 77 -- them. Calls Scan_Front_End_Switches for any front-end switches found. 78 -- 79 -- The processing of arguments is private to the back end, since the way 80 -- of acquiring the arguments as well as the set of allowable back end 81 -- switches is different depending on the particular back end being used. 82 -- 83 -- Any processed switches that influence the result of a compilation must 84 -- be added to the Compilation_Arguments table. 85 86 procedure Gen_Or_Update_Object_File; 87 -- Is used to generate the object file (if generated directly by gnat1), or 88 -- update it if it has already been generated by the call to Call_Back_End, 89 -- so that its timestamp is updated by the call. 90 -- 91 -- This is a no-op with the gcc back-end (the object file is generated by 92 -- the assembler afterwards), but is needed for back-ends that directly 93 -- generate the final object file (such as the .NET backend) so that the 94 -- object file's timestamp is correct when compared with the corresponding 95 -- ali file by gnatmake. 96 97end Back_End; 98