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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
+ Precision : Positive; -- Precision of representation in bits
+ 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;