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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 -- N L I S T S --
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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. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package provides facilities for manipulating lists of nodes (see
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33 -- package Atree for format and implementation of tree nodes). The Link field
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34 -- of the nodes is used as the forward pointer for these lists. See also
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35 -- package Elists which provides another form of lists that are not threaded
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36 -- through the nodes (and therefore allow nodes to be on multiple lists).
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37
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38 with System;
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39 with Types; use Types;
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40
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41 package Nlists is
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42
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43 -- A node list is a list of nodes in a special format that means that
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44 -- nodes can be on at most one such list. For each node list, a list
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45 -- header is allocated in the lists table, and a List_Id value references
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46 -- this header, which may be used to access the nodes in the list using
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47 -- the set of routines that define this interface.
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48
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49 -- Note: node lists can contain either nodes or entities (extended nodes)
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50 -- or a mixture of nodes and extended nodes.
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51
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52 function In_Same_List (N1, N2 : Node_Or_Entity_Id) return Boolean;
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53 pragma Inline (In_Same_List);
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54 -- Equivalent to List_Containing (N1) = List_Containing (N2)
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55
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56 function Last_List_Id return List_Id;
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57 pragma Inline (Last_List_Id);
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58 -- Returns Id of last allocated list header
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59
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60 function Lists_Address return System.Address;
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61 pragma Inline (Lists_Address);
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62 -- Return address of Lists table (used in Back_End for Gigi call)
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63
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64 function Num_Lists return Nat;
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65 pragma Inline (Num_Lists);
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66 -- Number of currently allocated lists
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67
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68 function New_List return List_Id;
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69 -- Creates a new empty node list. Typically this is used to initialize
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70 -- a field in some other node which points to a node list where the list
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71 -- is then subsequently filled in using Append calls.
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72
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73 function Empty_List return List_Id renames New_List;
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74 -- Used in contexts where an empty list (as opposed to an initially empty
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75 -- list to be filled in) is required.
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76
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77 function New_List
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78 (Node : Node_Or_Entity_Id) return List_Id;
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79 -- Build a new list initially containing the given node
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80
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81 function New_List
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82 (Node1 : Node_Or_Entity_Id;
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83 Node2 : Node_Or_Entity_Id) return List_Id;
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84 -- Build a new list initially containing the two given nodes
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85
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86 function New_List
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87 (Node1 : Node_Or_Entity_Id;
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88 Node2 : Node_Or_Entity_Id;
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89 Node3 : Node_Or_Entity_Id) return List_Id;
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90 -- Build a new list initially containing the three given nodes
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91
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92 function New_List
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93 (Node1 : Node_Or_Entity_Id;
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94 Node2 : Node_Or_Entity_Id;
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95 Node3 : Node_Or_Entity_Id;
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96 Node4 : Node_Or_Entity_Id) return List_Id;
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97
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98 function New_List
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99 (Node1 : Node_Or_Entity_Id;
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100 Node2 : Node_Or_Entity_Id;
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101 Node3 : Node_Or_Entity_Id;
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102 Node4 : Node_Or_Entity_Id;
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103 Node5 : Node_Or_Entity_Id) return List_Id;
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104 -- Build a new list initially containing the five given nodes
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105
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106 function New_List
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107 (Node1 : Node_Or_Entity_Id;
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108 Node2 : Node_Or_Entity_Id;
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109 Node3 : Node_Or_Entity_Id;
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110 Node4 : Node_Or_Entity_Id;
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111 Node5 : Node_Or_Entity_Id;
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112 Node6 : Node_Or_Entity_Id) return List_Id;
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113 -- Build a new list initially containing the six given nodes
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114
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115 function New_Copy_List (List : List_Id) return List_Id;
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116 -- Creates a new list containing copies (made with Atree.New_Copy) of every
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117 -- node in the original list. If the argument is No_List, then the returned
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118 -- result is No_List. If the argument is an empty list, then the returned
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119 -- result is a new empty list.
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120
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121 function New_Copy_List_Original (List : List_Id) return List_Id;
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122 -- Same as New_Copy_List but copies only nodes coming from source
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123
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124 function First (List : List_Id) return Node_Or_Entity_Id;
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125 pragma Inline (First);
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126 -- Obtains the first element of the given node list or, if the node list
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127 -- has no items or is equal to No_List, then Empty is returned.
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128
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129 function First_Non_Pragma (List : List_Id) return Node_Or_Entity_Id;
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130 -- Used when dealing with a list that can contain pragmas to skip past
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131 -- any initial pragmas and return the first element that is not a pragma.
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132 -- If the list is empty, or if it contains only pragmas, then Empty is
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133 -- returned. It is an error to call First_Non_Pragma with a Node_Id value
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134 -- or No_List (No_List is not considered to be the same as an empty list).
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135 -- This function also skips N_Null nodes which can result from rewriting
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136 -- unrecognized or incorrect pragmas.
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137
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138 function Last (List : List_Id) return Node_Or_Entity_Id;
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139 pragma Inline (Last);
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140 -- Obtains the last element of the given node list or, if the node list
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141 -- has no items, then Empty is returned. It is an error to call Last with
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142 -- a Node_Id or No_List. (No_List is not considered to be the same as an
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143 -- empty node list).
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144
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145 function Last_Non_Pragma (List : List_Id) return Node_Or_Entity_Id;
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146 -- Obtains the last element of a given node list that is not a pragma.
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147 -- If the list is empty, or if it contains only pragmas, then Empty is
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148 -- returned. It is an error to call Last_Non_Pragma with a Node_Id or
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149 -- No_List. (No_List is not considered to be the same as an empty list).
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150
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151 function List_Length (List : List_Id) return Nat;
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152 -- Returns number of items in the given list. It is an error to call
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153 -- this function with No_List (No_List is not considered to be the same
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154 -- as an empty list).
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155
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156 function Next (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id;
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157 pragma Inline (Next);
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158 -- This function returns the next node on a node list, or Empty if Node is
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159 -- the last element of the node list. The argument must be a member of a
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160 -- node list.
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161
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162 procedure Next (Node : in out Node_Or_Entity_Id);
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163 pragma Inline (Next);
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164 -- Equivalent to Node := Next (Node);
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165
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166 function Next_Non_Pragma
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167 (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id;
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168 -- This function returns the next node on a node list, skipping past any
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169 -- pragmas, or Empty if there is no non-pragma entry left. The argument
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170 -- must be a member of a node list. This function also skips N_Null nodes
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171 -- which can result from rewriting unrecognized or incorrect pragmas.
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172
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173 procedure Next_Non_Pragma (Node : in out Node_Or_Entity_Id);
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174 pragma Inline (Next_Non_Pragma);
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175 -- Equivalent to Node := Next_Non_Pragma (Node);
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176
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177 function Prev (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id;
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178 pragma Inline (Prev);
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179 -- This function returns the previous node on a node list, or Empty
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180 -- if Node is the first element of the node list. The argument must be
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181 -- a member of a node list. Note: the implementation does maintain back
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182 -- pointers, so this function executes quickly in constant time.
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183
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184 function Pick (List : List_Id; Index : Pos) return Node_Or_Entity_Id;
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185 -- Given a list, picks out the Index'th entry (1 = first entry). The
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186 -- caller must ensure that Index is in range.
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187
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188 procedure Prev (Node : in out Node_Or_Entity_Id);
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189 pragma Inline (Prev);
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190 -- Equivalent to Node := Prev (Node);
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191
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192 function Prev_Non_Pragma
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193 (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id;
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194 pragma Inline (Prev_Non_Pragma);
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195 -- This function returns the previous node on a node list, skipping any
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196 -- pragmas. If Node is the first element of the list, or if the only
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197 -- elements preceding it are pragmas, then Empty is returned. The
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198 -- argument must be a member of a node list. Note: the implementation
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199 -- does maintain back pointers, so this function executes quickly in
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200 -- constant time.
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201
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202 procedure Prev_Non_Pragma (Node : in out Node_Or_Entity_Id);
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203 pragma Inline (Prev_Non_Pragma);
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204 -- Equivalent to Node := Prev_Non_Pragma (Node);
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205
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206 function Is_Empty_List (List : List_Id) return Boolean;
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207 pragma Inline (Is_Empty_List);
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208 -- This function determines if a given list id references a node list that
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209 -- contains no items. No_List as an argument returns True.
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210
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211 function Is_Non_Empty_List (List : List_Id) return Boolean;
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212 pragma Inline (Is_Non_Empty_List);
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213 -- This function determines if a given list id references a node list that
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214 -- contains at least one item. No_List as an argument returns False.
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215
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216 function Is_List_Member (Node : Node_Or_Entity_Id) return Boolean;
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217 pragma Inline (Is_List_Member);
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218 -- This function determines if a given node is a member of a node list.
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219 -- It is an error for Node to be Empty, or to be a node list.
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220
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221 function List_Containing (Node : Node_Or_Entity_Id) return List_Id;
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222 pragma Inline (List_Containing);
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223 -- This function provides a pointer to the node list containing Node.
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224 -- Node must be a member of a node list.
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225
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226 procedure Append (Node : Node_Or_Entity_Id; To : List_Id);
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227 -- Appends Node at the end of node list To. Node must be a non-empty node
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228 -- that is not already a member of a node list, and To must be a node list.
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229 -- An attempt to append an error node is ignored without complaint and the
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230 -- list is unchanged.
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231
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232 procedure Append_New (Node : Node_Or_Entity_Id; To : in out List_Id);
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233 pragma Inline (Append_New);
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234 -- Appends Node at the end of node list To. If To is non-existent list, a
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235 -- list is created. Node must be a non-empty node that is not already a
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236 -- member of a node list, and To must be a node list.
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237
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238 procedure Append_New_To (To : in out List_Id; Node : Node_Or_Entity_Id);
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239 pragma Inline (Append_New_To);
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240 -- Like Append_New, but the arguments are in reverse order
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241
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242 procedure Append_To (To : List_Id; Node : Node_Or_Entity_Id);
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243 pragma Inline (Append_To);
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244 -- Like Append, but arguments are the other way round
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245
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246 procedure Append_List (List : List_Id; To : List_Id);
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247 -- Appends node list List to the end of node list To. On return,
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248 -- List is reset to be empty.
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249
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250 procedure Append_List_To (To : List_Id; List : List_Id);
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251 pragma Inline (Append_List_To);
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252 -- Like Append_List, but arguments are the other way round
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253
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254 procedure Insert_After
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255 (After : Node_Or_Entity_Id;
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256 Node : Node_Or_Entity_Id);
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257 -- Insert Node, which must be a non-empty node that is not already a
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258 -- member of a node list, immediately past node After, which must be a
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259 -- node that is currently a member of a node list. An attempt to insert
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260 -- an error node is ignored without complaint (and the list is unchanged).
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261
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262 procedure Insert_List_After
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263 (After : Node_Or_Entity_Id;
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264 List : List_Id);
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265 -- Inserts the entire contents of node list List immediately after node
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266 -- After, which must be a member of a node list. On return, the node list
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267 -- List is reset to be the empty node list.
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268
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269 procedure Insert_Before
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270 (Before : Node_Or_Entity_Id;
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271 Node : Node_Or_Entity_Id);
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272 -- Insert Node, which must be a non-empty node that is not already a
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273 -- member of a node list, immediately before Before, which must be a node
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274 -- that is currently a member of a node list. An attempt to insert an
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275 -- error node is ignored without complaint (and the list is unchanged).
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276
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277 procedure Insert_List_Before
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278 (Before : Node_Or_Entity_Id;
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279 List : List_Id);
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280 -- Inserts the entire contents of node list List immediately before node
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281 -- Before, which must be a member of a node list. On return, the node list
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282 -- List is reset to be the empty node list.
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283
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284 procedure Prepend
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285 (Node : Node_Or_Entity_Id;
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286 To : List_Id);
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287 -- Prepends Node at the start of node list To. Node must be a non-empty
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288 -- node that is not already a member of a node list, and To must be a
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289 -- node list. An attempt to prepend an error node is ignored without
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290 -- complaint and the list is unchanged.
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291
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292 procedure Prepend_List
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293 (List : List_Id;
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294 To : List_Id);
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295 -- Prepends node list List to the start of node list To. On return,
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296 -- List is reset to be empty.
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297
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298 procedure Prepend_List_To
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299 (To : List_Id;
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300 List : List_Id);
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301 pragma Inline (Prepend_List_To);
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302 -- Like Prepend_List, but arguments are the other way round
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303
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304 procedure Prepend_New (Node : Node_Or_Entity_Id; To : in out List_Id);
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305 pragma Inline (Prepend_New);
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306 -- Prepends Node at the end of node list To. If To is non-existent list, a
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307 -- list is created. Node must be a non-empty node that is not already a
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308 -- member of a node list, and To must be a node list.
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309
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310 procedure Prepend_New_To (To : in out List_Id; Node : Node_Or_Entity_Id);
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311 pragma Inline (Prepend_New_To);
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312 -- Like Prepend_New, but the arguments are in reverse order
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313
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314 procedure Prepend_To
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315 (To : List_Id;
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316 Node : Node_Or_Entity_Id);
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317 pragma Inline (Prepend_To);
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318 -- Like Prepend, but arguments are the other way round
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319
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320 procedure Remove (Node : Node_Or_Entity_Id);
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321 -- Removes Node, which must be a node that is a member of a node list,
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322 -- from this node list. The contents of Node are not otherwise affected.
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323
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324 function Remove_Head (List : List_Id) return Node_Or_Entity_Id;
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325 -- Removes the head element of a node list, and returns the node (whose
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326 -- contents are not otherwise affected) as the result. If the node list
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327 -- is empty, then Empty is returned.
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328
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329 function Remove_Next (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id;
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330 -- Removes the item immediately following the given node, and returns it
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331 -- as the result. If Node is the last element of the list, then Empty is
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332 -- returned. Node must be a member of a list. Unlike Remove, Remove_Next
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333 -- is fast and does not involve any list traversal.
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334
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335 procedure Initialize;
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336 -- Called at the start of compilation of each new main source file to
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337 -- initialize the allocation of the list table. Note that Initialize
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338 -- must not be called if Tree_Read is used.
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339
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340 procedure Lock;
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341 -- Called to lock tables before back end is called
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342
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343 procedure Lock_Lists;
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344 -- Called to lock list contents when assertions are enabled. Without
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345 -- assertions calling this subprogram has no effect. The initial state
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346 -- of the lock is unlocked.
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347
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348 procedure Unlock;
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349 -- Unlock tables, in cases where the back end needs to modify them
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350
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351 procedure Unlock_Lists;
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352 -- Called to unlock list contents when assertions are enabled; if
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353 -- assertions are not enabled calling this subprogram has no effect.
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354
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355 procedure Tree_Read;
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356 -- Initializes internal tables from current tree file using the relevant
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357 -- Table.Tree_Read routines. Note that Initialize should not be called if
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358 -- Tree_Read is used. Tree_Read includes all necessary initialization.
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359
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360 procedure Tree_Write;
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361 -- Writes out internal tables to current tree file using the relevant
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362 -- Table.Tree_Write routines.
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363
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364 function Parent (List : List_Id) return Node_Or_Entity_Id;
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365 pragma Inline (Parent);
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366 -- Node lists may have a parent in the same way as a node. The function
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367 -- accesses the Parent value, which is either Empty when a list header
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368 -- is first created, or the value that has been set by Set_Parent.
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369
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370 procedure Set_Parent (List : List_Id; Node : Node_Or_Entity_Id);
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371 pragma Inline (Set_Parent);
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372 -- Sets the parent field of the given list to reference the given node
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373
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374 function No (List : List_Id) return Boolean;
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375 pragma Inline (No);
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376 -- Tests given Id for equality with No_List. This allows notations like
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377 -- "if No (Statements)" as opposed to "if Statements = No_List". Note that
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378 -- an empty list gives False for this test, as opposed to Is_Empty_List
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379 -- which gives True either for No_List or for an empty list.
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380
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381 function Present (List : List_Id) return Boolean;
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382 pragma Inline (Present);
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383 -- Tests given Id for inequality with No_List. This allows notations like
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384 -- "if Present (Statements)" as opposed to "if Statements /= No_List".
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385
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386 procedure Allocate_List_Tables (N : Node_Or_Entity_Id);
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387 -- Called when nodes table is expanded to include node N. This call
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388 -- makes sure that list structures internal to Nlists are adjusted
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389 -- appropriately to reflect this increase in the size of the nodes table.
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390
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391 function Next_Node_Address return System.Address;
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392 function Prev_Node_Address return System.Address;
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393 -- These functions return the addresses of the Next_Node and Prev_Node
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394 -- tables (used in Back_End for Gigi).
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395
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396 end Nlists;
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