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105 lines
5.3 KiB
Ada
105 lines
5.3 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) 2000-2022, 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 3, 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 COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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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 : constant string (1 .. M) := "chars";
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-- xxxN : constant array (0 .. N) of Index_Type := (i1, i2, .., iN, j);
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--
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-- Here xxxS is a string obtained by concatenating all the names of the
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-- enumeration literals in sequence, representing any wide characters
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-- according to the current wide character encoding method, and with all
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-- letters forced to upper case.
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--
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-- The array xxxN is an array of indexes into xxxS pointing to the start
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-- of each name, with one extra entry at the end, which is the index to
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-- the character just past the end of the last literal, i.e. it is the
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-- length of xxxS + 1. The element type is the shortest of the possible
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-- 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 : constant string (1 .. 15) := "hello'!'goodbye";
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-- xxxN : constant array (0 .. 3) of Integer_8 := (1, 6, 9, 16);
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--
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-- Here Integer_8 is used since 16 < 2**(8-1).
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--
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-- If the entity E needs the tables, the necessary declarations are built
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-- and the fields Lit_Strings and Lit_Indexes of E are set to point to the
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-- corresponding entities. If no tables are needed (E is not a user defined
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-- enumeration 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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--
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-- If the number of enumeration literals is large enough, a (perfect) hash
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-- function mapping the literals to their position number is also built and
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-- requires additional tables. See the System.Perfect_Hash_Generators unit
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-- for a complete description of this processing.
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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 of the
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-- attribute Image.
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procedure Expand_Wide_Image_Attribute (N : Node_Id);
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-- This procedure is called from Exp_Attr to expand an occurrence of the
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-- attribute Wide_Image.
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procedure Expand_Wide_Wide_Image_Attribute (N : Node_Id);
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-- This procedure is called from Exp_Attr to expand an occurrence of the
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-- attribute Wide_Wide_Image.
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procedure Expand_Valid_Value_Attribute (N : Node_Id);
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-- This procedure is called from Exp_Attr to expand an occurrence of the
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-- attribute Valid_Value.
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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 of the
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-- attribute Value.
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type Atype is (Normal, Wide, Wide_Wide);
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-- Type of attribute in call to Expand_Width_Attribute
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procedure Expand_Width_Attribute (N : Node_Id; Attr : Atype := Normal);
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-- This procedure is called from Exp_Attr to expand an occurrence of the
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-- attributes Width (Attr = Normal), or Wide_Width (Attr Wide), or
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-- Wide_Wide_Width (Attr = Wide_Wide).
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end Exp_Imgv;
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