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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- B A C K _ E N D --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2013, 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
+
+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);
+
+ 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.
+ --
+ -- This routine is expected to set the following to True if necessary (the
+ -- default for all of these in Opt is False).
+ --
+ -- Opt.Suppress_All_Inlining
+ -- Opt.Suppress_Control_Float_Optimizations
+ -- Opt.Generate_SCO
+ -- Opt.Generate_SCO_Instance_Table
+ -- Opt.Stack_Checking_Enabled
+ -- Opt.No_Stdinc
+ -- Opt.No_Stdlib
+
+ 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;