1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- E X P _ I M G V -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 2000-2007, 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-- Expand routines for Image, Value and Width attributes. These are the 27-- attributes that make use of enumeration type image tables. 28 29with Types; use Types; 30 31package Exp_Imgv is 32 33 procedure Build_Enumeration_Image_Tables (E : Entity_Id; N : Node_Id); 34 -- Build the enumeration image tables for E, which is an enumeration 35 -- base type. The node N is the point in the tree where the resulting 36 -- declarations are to be inserted. 37 -- 38 -- The form of the tables generated is as follows: 39 -- 40 -- xxxS : string := "chars"; 41 -- xxxI : array (0 .. N) of Natural_8/16/32 := (1, n, .., n); 42 -- 43 -- Here xxxS is a string obtained by concatenating all the names 44 -- of the enumeration literals in sequence, representing any wide 45 -- characters according to the current wide character encoding 46 -- method, and with all letters forced to upper case. 47 -- 48 -- The array xxxI is an array of ones origin indexes to the start 49 -- of each name, with one extra entry at the end, which is the index 50 -- to the character just past the end of the last literal, i.e. it is 51 -- the length of xxxS + 1. The element type is the shortest of the 52 -- possible types that will hold all the values. 53 -- 54 -- For example, for the type 55 -- 56 -- type x is (hello,'!',goodbye); 57 -- 58 -- the generated tables would consist of 59 -- 60 -- xxxS : String := "hello'!'goodbye"; 61 -- xxxI : array (0 .. 3) of Natural_8 := (1, 6, 9, 16); 62 -- 63 -- Here Natural_8 is used since 16 < 2**(8-1) 64 -- 65 -- If the entity E needs the tables constructing, the necessary 66 -- declarations are constructed, and the fields Lit_Strings and 67 -- Lit_Indexes of E are set to point to the corresponding entities. 68 -- If no tables are needed (E is not a user defined enumeration 69 -- root type, or pragma Discard_Names is in effect, then the 70 -- declarations are not constructed, and the fields remain Empty. 71 72 procedure Expand_Image_Attribute (N : Node_Id); 73 -- This procedure is called from Exp_Attr to expand an occurrence 74 -- of the attribute Image. 75 76 procedure Expand_Wide_Image_Attribute (N : Node_Id); 77 -- This procedure is called from Exp_Attr to expand an occurrence 78 -- of the attribute Wide_Image. 79 80 procedure Expand_Wide_Wide_Image_Attribute (N : Node_Id); 81 -- This procedure is called from Exp_Attr to expand an occurrence 82 -- of the attribute Wide_Wide_Image. 83 84 procedure Expand_Value_Attribute (N : Node_Id); 85 -- This procedure is called from Exp_Attr to expand an occurrence 86 -- of the attribute Value. 87 88 type Atype is (Normal, Wide, Wide_Wide); 89 -- Type of attribute in call to Expand_Width_Attribute 90 91 procedure Expand_Width_Attribute (N : Node_Id; Attr : Atype := Normal); 92 -- This procedure is called from Exp_Attr to expand an occurrence of the 93 -- attributes Width (Attr = Normal), or Wide_Width (Attr Wide), or 94 -- Wide_Wide_Width (Attr = Wide_Wide). 95 96end Exp_Imgv; 97