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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             B A C K _ E N D                              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2011, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  Call the back end with all the information needed. Also contains other

--  back-end specific interfaces required by the front end.

with Einfo; use Einfo;

package Back_End is

   type Back_End_Mode_Type is (

      Generate_Object,

      --  Full back end operation with object file generation

      Declarations_Only,

      --  Partial back end operation with no object file generation. In this

      --  mode the only useful action performed by gigi is to process all

      --  declarations issuing any error messages (in particular those to

      --  do with rep clauses), and to back annotate representation info.

      Skip);

      --  Back end call is skipped (syntax only, or errors found)

   pragma Convention (C, Back_End_Mode_Type);

   for Back_End_Mode_Type use (0, 1, 2);

   type C_String is array (0 .. 255) of aliased Character;

   pragma Convention (C, C_String);

   type Register_Type_Proc is access procedure

     (C_Name    : C_String; -- Nul-terminated string with name of type

      Digs      : Natural;  -- Nr or digits for floating point, 0 otherwise

      Complex   : Boolean;  -- True iff type has real and imaginary parts

      Count     : Natural;  -- Number of elements in vector, 0 otherwise

      Float_Rep : Float_Rep_Kind; -- Representation used for fpt type

      Size      : Positive; -- Size of representation in bits

      Alignment : Natural); -- Required alignment in bits

   pragma Convention (C, Register_Type_Proc);

   --  Call back procedure for Register_Back_End_Types. This is to be used by

   --  Create_Standard to create predefined types for all types supported by

   --  the back end.

   procedure Register_Back_End_Types (Call_Back : Register_Type_Proc);

   --  Calls the Call_Back function with information for each supported type.

   procedure Call_Back_End (Mode : Back_End_Mode_Type);

   --  Call back end, i.e. make call to driver traversing the tree and

   --  outputting code. This call is made with all tables locked.

   --  The back end is responsible for unlocking any tables it may need

   --  to change, and locking them again before returning.

   procedure Scan_Compiler_Arguments;

   --  Acquires command-line parameters passed to the compiler and processes

   --  them. Calls Scan_Front_End_Switches for any front-end switches found.

   --

   --  The processing of arguments is private to the back end, since the way

   --  of acquiring the arguments as well as the set of allowable back end

   --  switches is different depending on the particular back end being used.

   --

   --  Any processed switches that influence the result of a compilation must

   --  be added to the Compilation_Arguments table.

   procedure Gen_Or_Update_Object_File;

   --  Is used to generate the object file (if generated directly by gnat1), or

   --  update it if it has already been generated by the call to Call_Back_End,

   --  so that its timestamp is updated by the call.

   --

   --  This is a no-op with the gcc back-end (the object file is generated by

   --  the assembler afterwards), but is needed for back-ends that directly

   --  generate the final object file (such as the .NET backend) so that the

   --  object file's timestamp is correct when compared with the corresponding

   --  ali file by gnatmake.

end Back_End;