1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 2011, Free Software Foundation, Inc. --
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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
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.
31 -- Expand_Alfa is called directly by Expander.Expand.
33 -- Alfa expansion has three main objectives:
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)
39 -- 2. Facilitate treatment for the formal verification back-end (fully
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)
46 with Types; use Types;
50 procedure Expand_Alfa (N : Node_Id);