------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- E X P _ I M G V -- -- -- -- S p e c -- -- -- -- Copyright (C) 2000-2022, 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 3, 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 COPYING3. If not, go to -- -- http://www.gnu.org/licenses for a complete copy of the license. -- -- -- -- 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 : constant string (1 .. M) := "chars"; -- xxxN : constant array (0 .. N) of Index_Type := (i1, i2, .., iN, j); -- -- 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 xxxN is an array of indexes into xxxS pointing 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 : constant string (1 .. 15) := "hello'!'goodbye"; -- xxxN : constant array (0 .. 3) of Integer_8 := (1, 6, 9, 16); -- -- Here Integer_8 is used since 16 < 2**(8-1). -- -- If the entity E needs the tables, the necessary declarations are built -- 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. -- -- If the number of enumeration literals is large enough, a (perfect) hash -- function mapping the literals to their position number is also built and -- requires additional tables. See the System.Perfect_Hash_Generators unit -- for a complete description of this processing. procedure Expand_Image_Attribute (N : Node_Id); -- This procedure is called from Exp_Attr to expand an occurrence of the -- attribute Image. procedure Expand_Wide_Image_Attribute (N : Node_Id); -- This procedure is called from Exp_Attr to expand an occurrence of the -- attribute Wide_Image. procedure Expand_Wide_Wide_Image_Attribute (N : Node_Id); -- This procedure is called from Exp_Attr to expand an occurrence of the -- attribute Wide_Wide_Image. procedure Expand_Valid_Value_Attribute (N : Node_Id); -- This procedure is called from Exp_Attr to expand an occurrence of the -- attribute Valid_Value. procedure Expand_Value_Attribute (N : Node_Id); -- This procedure is called from Exp_Attr to expand an occurrence of the -- attribute Value. type Atype is (Normal, Wide, Wide_Wide); -- Type of attribute in call to Expand_Width_Attribute procedure Expand_Width_Attribute (N : Node_Id; Attr : Atype := Normal); -- This procedure is called from Exp_Attr to expand an occurrence of the -- attributes Width (Attr = Normal), or Wide_Width (Attr Wide), or -- Wide_Wide_Width (Attr = Wide_Wide). end Exp_Imgv;