| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- E X P _ I M G V -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- $Revision: 1.2 $ -- |
| -- -- |
| -- 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. -- |
| -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- 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; |
