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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.      --
--                                                                          --
------------------------------------------------------------------------------
 
--  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;