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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             E X P _ A L F A                              --

--                                                                          --

--                                 S p e c                                  --

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--             Copyright (C) 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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--  This package implements a light expansion which is used in formal

--  verification mode. Instead of a complete expansion of nodes for code

--  generation, this Alfa expansion targets generation of intermediate code

--  for formal verification.

--  Expand_Alfa is called directly by Expander.Expand.

--  Alfa expansion has three main objectives:

--    1. Perform limited expansion to explicit some Ada rules and constructs

--       (translate 'Old and 'Result, replace renamings by renamed, insert

--        conversions, expand actuals in calls to introduce temporaries)

--    2. Facilitate treatment for the formal verification back-end (fully

--       qualify names, set membership)

--    3. Avoid the introduction of low-level code that is difficult to analyze

--       formally, as typically done in the full expansion for high-level

--       constructs (tasking, dispatching)

with Types; use Types;

package Exp_Alfa is

   procedure Expand_Alfa (N : Node_Id);

end Exp_Alfa;