+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- E X P _ I M G V --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- Copyright (C) 2000 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 2, 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 COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- Expand routines for Image, Value and Width attributes. These are the
--- attributes that make use of enumeration type image tables.
-
-with Types; use Types;
-
-package Exp_Imgv is
-
- procedure Build_Enumeration_Image_Tables (E : Entity_Id; N : Node_Id);
- -- Build the enumeration image tables for E, which is an enumeration
- -- base type. The node N is the point in the tree where the resulting
- -- declarations are to be inserted.
- --
- -- The form of the tables generated is as follows:
- --
- -- xxxS : string := "chars";
- -- xxxI : array (0 .. N) of Natural_8/16/32 := (1, n, .., n);
- --
- -- Here xxxS is a string obtained by concatenating all the names
- -- of the enumeration literals in sequence, representing any wide
- -- characters according to the current wide character encoding
- -- method, and with all letters forced to upper case.
- --
- -- The array xxxI is an array of ones origin indexes to the start
- -- of each name, with one extra entry at the end, which is the index
- -- to the character just past the end of the last literal, i.e. it is
- -- the length of xxxS + 1. The element type is the shortest of the
- -- possible types that will hold all the values.
- --
- -- For example, for the type
- --
- -- type x is (hello,'!',goodbye);
- --
- -- the generated tables would consist of
- --
- -- xxxS : String := "hello'!'goodbye";
- -- xxxI : array (0 .. 3) of Natural_8 := (1, 6, 9, 16);
- --
- -- Here Natural_8 is used since 16 < 2**(8-1)
- --
- -- If the entity E needs the tables constructing, the necessary
- -- declarations are constructed, and the fields Lit_Strings and
- -- Lit_Indexes of E are set to point to the corresponding entities.
- -- If no tables are needed (E is not a user defined enumeration
- -- root type, or pragma Discard_Names is in effect, then the
- -- declarations are not constructed, and the fields remain Empty.
-
- procedure Expand_Image_Attribute (N : Node_Id);
- -- This procedure is called from Exp_Attr to expand an occurrence
- -- of the attribute Image.
-
- procedure Expand_Value_Attribute (N : Node_Id);
- -- This procedure is called from Exp_Attr to expand an occurrence
- -- of the attribute Value.
-
- procedure Expand_Width_Attribute (N : Node_Id; Wide : Boolean);
- -- This procedure is called from Exp_Attr to expand an occurrence of
- -- the attributes Width (Wide = False) or Wide_Width (Wide = True).
-
-end Exp_Imgv;
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