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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 _ C H 3 --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, 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 chapter 3 constructs
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27
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28 with Types; use Types;
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29 with Elists; use Elists;
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30 with Uintp; use Uintp;
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31
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32 package Exp_Ch3 is
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33
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34 procedure Expand_N_Object_Declaration (N : Node_Id);
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35 procedure Expand_N_Subtype_Indication (N : Node_Id);
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36 procedure Expand_N_Variant_Part (N : Node_Id);
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37 procedure Expand_N_Full_Type_Declaration (N : Node_Id);
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38
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39 procedure Expand_Previous_Access_Type (Def_Id : Entity_Id);
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40 -- For a full type declaration that contains tasks, or that is a task,
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41 -- check whether there exists an access type whose designated type is an
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42 -- incomplete declarations for the current composite type. If so, build the
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43 -- master for that access type, now that it is known to denote an object
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44 -- with tasks.
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45
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46 procedure Expand_Record_Extension (T : Entity_Id; Def : Node_Id);
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47 -- Add a field _parent in the extension part of the record
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48
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49 procedure Build_Discr_Checking_Funcs (N : Node_Id);
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50 -- Builds function which checks whether the component name is consistent
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51 -- with the current discriminants. N is the full type declaration node,
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52 -- and the discriminant checking functions are inserted after this node.
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53
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54 function Build_Initialization_Call
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55 (Loc : Source_Ptr;
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56 Id_Ref : Node_Id;
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57 Typ : Entity_Id;
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58 In_Init_Proc : Boolean := False;
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59 Enclos_Type : Entity_Id := Empty;
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60 Discr_Map : Elist_Id := New_Elmt_List;
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61 With_Default_Init : Boolean := False;
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62 Constructor_Ref : Node_Id := Empty) return List_Id;
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63 -- Builds a call to the initialization procedure for the base type of Typ,
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64 -- passing it the object denoted by Id_Ref, plus additional parameters as
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65 -- appropriate for the type (the _Master, for task types, for example).
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66 -- Loc is the source location for the constructed tree. In_Init_Proc has
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67 -- to be set to True when the call is itself in an init proc in order to
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68 -- enable the use of discriminals. Enclos_Type is the enclosing type when
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69 -- initializing a component in an outer init proc, and it is used for
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70 -- various expansion cases including the case where Typ is a task type
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71 -- which is an array component, the indexes of the enclosing type are
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72 -- used to build the string that identifies each task at runtime.
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73 --
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74 -- Discr_Map is used to replace discriminants by their discriminals in
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75 -- expressions used to constrain record components. In the presence of
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76 -- entry families bounded by discriminants, protected type discriminants
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77 -- can appear within expressions in array bounds (not as stand-alone
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78 -- identifiers) and a general replacement is necessary.
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79 --
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80 -- Ada 2005 (AI-287): With_Default_Init is used to indicate that the
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81 -- initialization call corresponds to a default initialized component
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82 -- of an aggregate.
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83 --
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84 -- Constructor_Ref is a call to a constructor subprogram. It is currently
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85 -- used only to support C++ constructors.
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86
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131
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87 function Build_Variant_Record_Equality
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88 (Typ : Entity_Id;
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89 Body_Id : Entity_Id;
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90 Param_Specs : List_Id) return Node_Id;
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91 -- Build the body of the equality function Body_Id for the untagged variant
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92 -- record Typ with the given parameters specification list.
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93
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111
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94 function Freeze_Type (N : Node_Id) return Boolean;
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95 -- This function executes the freezing actions associated with the given
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96 -- freeze type node N and returns True if the node is to be deleted. We
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97 -- delete the node if it is present just for front end purpose and we don't
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98 -- want Gigi to see the node. This function can't delete the node itself
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99 -- since it would confuse any remaining processing of the freeze node.
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100
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101 function Get_Simple_Init_Val
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102 (Typ : Entity_Id;
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103 N : Node_Id;
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104 Size : Uint := No_Uint) return Node_Id;
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105 -- Build an expression which represents the required initial value of type
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106 -- Typ for which predicate Needs_Simple_Initialization is True. N is a node
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107 -- whose source location used in the construction of the expression. Size
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108 -- is utilized as follows:
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109 --
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110 -- * If the size of the object to be initialized it is known, it should
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111 -- be passed to the routine.
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112 --
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113 -- * If the size is unknown or is zero, then the Esize of Typ is used as
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114 -- an estimate of the size.
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115 --
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116 -- The object size is needed to prepare a known invalid value for use by
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117 -- Normalize_Scalars. A call to this routine where Typ denotes a scalar
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118 -- type is only valid when Normalize_Scalars or Initialize_Scalars is
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119 -- active, or if N is the node for a 'Invalid_Value attribute node.
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120
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111
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121 procedure Init_Secondary_Tags
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122 (Typ : Entity_Id;
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123 Target : Node_Id;
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124 Init_Tags_List : List_Id;
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125 Stmts_List : List_Id;
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126 Fixed_Comps : Boolean := True;
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127 Variable_Comps : Boolean := True);
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128 -- Ada 2005 (AI-251): Initialize the tags of the secondary dispatch tables
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129 -- of Typ. The generated code referencing tag fields of Target is appended
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130 -- to Init_Tags_List and the code required to complete the elaboration of
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131 -- the dispatch tables of Typ is appended to Stmts_List. If Fixed_Comps is
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132 -- True then the tag components located at fixed positions of Target are
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133 -- initialized; if Variable_Comps is True then tags components located at
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134 -- variable positions of Target are initialized.
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135
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136 function Make_Tag_Assignment (N : Node_Id) return Node_Id;
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137 -- An object declaration that has an initialization for a tagged object
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138 -- requires a separate reassignment of the tag of the given type, because
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139 -- the expression may include an unchecked conversion. This tag assignment
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140 -- is inserted after the declaration, but if the object has an address
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141 -- clause the assignment is handled as part of the freezing of the object,
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142 -- see Check_Address_Clause.
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143
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144 end Exp_Ch3;
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