86 lines
4.4 KiB
Ada
86 lines
4.4 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- E X P _ I M G V --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2000 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Expand routines for Image, Value and Width attributes. These are the
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-- attributes that make use of enumeration type image tables.
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with Types; use Types;
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package Exp_Imgv is
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procedure Build_Enumeration_Image_Tables (E : Entity_Id; N : Node_Id);
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-- Build the enumeration image tables for E, which is an enumeration
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-- base type. The node N is the point in the tree where the resulting
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-- declarations are to be inserted.
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--
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-- The form of the tables generated is as follows:
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--
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-- xxxS : string := "chars";
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-- xxxI : array (0 .. N) of Natural_8/16/32 := (1, n, .., n);
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--
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-- Here xxxS is a string obtained by concatenating all the names
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-- of the enumeration literals in sequence, representing any wide
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-- characters according to the current wide character encoding
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-- method, and with all letters forced to upper case.
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--
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-- The array xxxI is an array of ones origin indexes to the start
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-- of each name, with one extra entry at the end, which is the index
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-- to the character just past the end of the last literal, i.e. it is
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-- the length of xxxS + 1. The element type is the shortest of the
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-- possible types that will hold all the values.
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--
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-- For example, for the type
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--
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-- type x is (hello,'!',goodbye);
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--
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-- the generated tables would consist of
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--
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-- xxxS : String := "hello'!'goodbye";
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-- xxxI : array (0 .. 3) of Natural_8 := (1, 6, 9, 16);
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--
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-- Here Natural_8 is used since 16 < 2**(8-1)
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--
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-- If the entity E needs the tables constructing, the necessary
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-- declarations are constructed, and the fields Lit_Strings and
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-- Lit_Indexes of E are set to point to the corresponding entities.
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-- If no tables are needed (E is not a user defined enumeration
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-- root type, or pragma Discard_Names is in effect, then the
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-- declarations are not constructed, and the fields remain Empty.
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procedure Expand_Image_Attribute (N : Node_Id);
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-- This procedure is called from Exp_Attr to expand an occurrence
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-- of the attribute Image.
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procedure Expand_Value_Attribute (N : Node_Id);
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-- This procedure is called from Exp_Attr to expand an occurrence
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-- of the attribute Value.
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procedure Expand_Width_Attribute (N : Node_Id; Wide : Boolean);
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-- This procedure is called from Exp_Attr to expand an occurrence of
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-- the attributes Width (Wide = False) or Wide_Width (Wide = True).
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end Exp_Imgv;
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