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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- E X P _ I M G V --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 2000-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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17 -- for more details. You should have received a copy of the GNU General --
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18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
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19 -- http://www.gnu.org/licenses for a complete copy of the license. --
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20 -- --
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21 -- GNAT was originally developed by the GNAT team at New York University. --
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22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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23 -- --
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24 ------------------------------------------------------------------------------
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25
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26 -- Expand routines for Image, Value and Width attributes. These are the
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27 -- attributes that make use of enumeration type image tables.
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28
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29 with Types; use Types;
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30
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31 package Exp_Imgv is
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32
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33 procedure Build_Enumeration_Image_Tables (E : Entity_Id; N : Node_Id);
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34 -- Build the enumeration image tables for E, which is an enumeration
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35 -- base type. The node N is the point in the tree where the resulting
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36 -- declarations are to be inserted.
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37 --
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38 -- The form of the tables generated is as follows:
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39 --
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40 -- xxxS : string := "chars";
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41 -- xxxI : array (0 .. N) of Natural_8/16/32 := (1, n, .., n);
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42 --
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43 -- Here xxxS is a string obtained by concatenating all the names
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44 -- of the enumeration literals in sequence, representing any wide
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45 -- characters according to the current wide character encoding
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46 -- method, and with all letters forced to upper case.
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47 --
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48 -- The array xxxI is an array of ones origin indexes to the start
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49 -- of each name, with one extra entry at the end, which is the index
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50 -- to the character just past the end of the last literal, i.e. it is
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51 -- the length of xxxS + 1. The element type is the shortest of the
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52 -- possible types that will hold all the values.
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53 --
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54 -- For example, for the type
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55 --
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56 -- type x is (hello,'!',goodbye);
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57 --
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58 -- the generated tables would consist of
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59 --
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60 -- xxxS : String := "hello'!'goodbye";
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61 -- xxxI : array (0 .. 3) of Natural_8 := (1, 6, 9, 16);
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62 --
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63 -- Here Natural_8 is used since 16 < 2**(8-1)
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64 --
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65 -- If the entity E needs the tables constructing, the necessary
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66 -- declarations are constructed, and the fields Lit_Strings and
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67 -- Lit_Indexes of E are set to point to the corresponding entities.
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68 -- If no tables are needed (E is not a user defined enumeration
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69 -- root type, or pragma Discard_Names is in effect, then the
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70 -- declarations are not constructed, and the fields remain Empty.
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71
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72 procedure Expand_Image_Attribute (N : Node_Id);
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73 -- This procedure is called from Exp_Attr to expand an occurrence of the
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74 -- attribute Image.
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75
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76 procedure Expand_Wide_Image_Attribute (N : Node_Id);
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77 -- This procedure is called from Exp_Attr to expand an occurrence of the
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78 -- attribute Wide_Image.
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79
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80 procedure Expand_Wide_Wide_Image_Attribute (N : Node_Id);
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81 -- This procedure is called from Exp_Attr to expand an occurrence of the
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82 -- attribute Wide_Wide_Image.
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83
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84 procedure Expand_Value_Attribute (N : Node_Id);
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85 -- This procedure is called from Exp_Attr to expand an occurrence of the
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86 -- attribute Value.
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87
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88 type Atype is (Normal, Wide, Wide_Wide);
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89 -- Type of attribute in call to Expand_Width_Attribute
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90
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91 procedure Expand_Width_Attribute (N : Node_Id; Attr : Atype := Normal);
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92 -- This procedure is called from Exp_Attr to expand an occurrence of the
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93 -- attributes Width (Attr = Normal), or Wide_Width (Attr Wide), or
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94 -- Wide_Wide_Width (Attr = Wide_Wide).
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95
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96 end Exp_Imgv;
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