gcc/ada/exp_alfa.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             E X P _ A L F A                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --             Copyright (C) 2011, Free Software Foundation, Inc.           --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 --  This package implements a light expansion which is used in formal
  27 --  verification mode. Instead of a complete expansion of nodes for code
  28 --  generation, this Alfa expansion targets generation of intermediate code
  29 --  for formal verification.
  30
  31 --  Expand_Alfa is called directly by Expander.Expand.
  32
  33 --  Alfa expansion has three main objectives:
  34
  35 --    1. Perform limited expansion to explicit some Ada rules and constructs
  36 --       (translate 'Old and 'Result, replace renamings by renamed, insert
  37 --        conversions, expand actuals in calls to introduce temporaries)
  38
  39 --    2. Facilitate treatment for the formal verification back-end (fully
  40 --       qualify names, set membership)
  41
  42 --    3. Avoid the introduction of low-level code that is difficult to analyze
  43 --       formally, as typically done in the full expansion for high-level
  44 --       constructs (tasking, dispatching)
  45
  46 with Types; use Types;
  47
  48 package Exp_Alfa is
  49
  50    procedure Expand_Alfa (N : Node_Id);
  51
  52 end Exp_Alfa;