PR c++/86728 - C variadic generic lambda.
[official-gcc.git] / gcc / ada / style.adb
bloba539c4542266db8481b3bc0429b61ba24b4cd83a
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S T Y L E --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Casing; use Casing;
28 with Csets; use Csets;
29 with Einfo; use Einfo;
30 with Errout; use Errout;
31 with Namet; use Namet;
32 with Nlists; use Nlists;
33 with Opt; use Opt;
34 with Sinfo; use Sinfo;
35 with Sinput; use Sinput;
36 with Stand; use Stand;
37 with Stylesw; use Stylesw;
39 package body Style is
41 -----------------------
42 -- Body_With_No_Spec --
43 -----------------------
45 -- If the check specs mode (-gnatys) is set, then all subprograms must
46 -- have specs unless they are parameterless procedures at the library
47 -- level (i.e. they are possible main programs).
49 procedure Body_With_No_Spec (N : Node_Id) is
50 begin
51 if Style_Check_Specs then
52 if Nkind (Parent (N)) = N_Compilation_Unit then
53 declare
54 Spec : constant Node_Id := Specification (N);
55 Defnm : constant Node_Id := Defining_Unit_Name (Spec);
57 begin
58 if Nkind (Spec) = N_Procedure_Specification
59 and then Nkind (Defnm) = N_Defining_Identifier
60 and then No (First_Formal (Defnm))
61 then
62 return;
63 end if;
64 end;
65 end if;
67 Error_Msg_N ("(style) subprogram body has no previous spec", N);
68 end if;
69 end Body_With_No_Spec;
71 ---------------------------------
72 -- Check_Array_Attribute_Index --
73 ---------------------------------
75 procedure Check_Array_Attribute_Index
76 (N : Node_Id;
77 E1 : Node_Id;
78 D : Int)
80 begin
81 if Style_Check_Array_Attribute_Index then
82 if D = 1 and then Present (E1) then
83 Error_Msg_N -- CODEFIX
84 ("(style) index number not allowed for one dimensional array",
85 E1);
86 elsif D > 1 and then No (E1) then
87 Error_Msg_N -- CODEFIX
88 ("(style) index number required for multi-dimensional array",
89 N);
90 end if;
91 end if;
92 end Check_Array_Attribute_Index;
94 ----------------------
95 -- Check_Identifier --
96 ----------------------
98 -- In check references mode (-gnatyr), identifier uses must be cased
99 -- the same way as the corresponding identifier declaration. If standard
100 -- references are checked (-gnatyn), then identifiers from Standard must
101 -- be cased as in the Reference Manual.
103 procedure Check_Identifier
104 (Ref : Node_Or_Entity_Id;
105 Def : Node_Or_Entity_Id)
107 Sref : Source_Ptr := Sloc (Ref);
108 Sdef : Source_Ptr := Sloc (Def);
109 Tref : Source_Buffer_Ptr;
110 Tdef : Source_Buffer_Ptr;
111 Nlen : Nat;
112 Cas : Casing_Type;
114 begin
115 -- If reference does not come from source, nothing to check
117 if not Comes_From_Source (Ref) then
118 return;
120 -- If previous error on either node/entity, ignore
122 elsif Error_Posted (Ref) or else Error_Posted (Def) then
123 return;
125 -- Case of definition comes from source
127 elsif Comes_From_Source (Def) then
129 -- Check same casing if we are checking references
131 if Style_Check_References then
132 Tref := Source_Text (Get_Source_File_Index (Sref));
133 Tdef := Source_Text (Get_Source_File_Index (Sdef));
135 -- Ignore operator name case completely. This also catches the
136 -- case of where one is an operator and the other is not. This
137 -- is a phenomenon from rewriting of operators as functions,
138 -- and is to be ignored.
140 if Tref (Sref) = '"' or else Tdef (Sdef) = '"' then
141 return;
143 else
144 while Tref (Sref) = Tdef (Sdef) loop
146 -- If end of identifier, all done
148 if not Identifier_Char (Tref (Sref)) then
149 return;
151 -- Otherwise loop continues
153 else
154 Sref := Sref + 1;
155 Sdef := Sdef + 1;
156 end if;
157 end loop;
159 -- Fall through loop when mismatch between identifiers
160 -- If either identifier is not terminated, error.
162 if Identifier_Char (Tref (Sref))
163 or else
164 Identifier_Char (Tdef (Sdef))
165 then
166 Error_Msg_Node_1 := Def;
167 Error_Msg_Sloc := Sloc (Def);
168 Error_Msg -- CODEFIX
169 ("(style) bad casing of & declared#", Sref, Ref);
170 return;
172 -- Else end of identifiers, and they match
174 else
175 return;
176 end if;
177 end if;
178 end if;
180 -- Case of definition in package Standard
182 elsif Sdef = Standard_Location
183 or else
184 Sdef = Standard_ASCII_Location
185 then
186 -- Check case of identifiers in Standard
188 if Style_Check_Standard then
189 Tref := Source_Text (Get_Source_File_Index (Sref));
191 -- Ignore operators
193 if Tref (Sref) = '"' then
194 null;
196 -- Otherwise determine required casing of Standard entity
198 else
199 -- ASCII is all upper case
201 if Entity (Ref) = Standard_ASCII then
202 Cas := All_Upper_Case;
204 -- Special handling for names in package ASCII
206 elsif Sdef = Standard_ASCII_Location then
207 declare
208 Nam : constant String := Get_Name_String (Chars (Def));
210 begin
211 -- Bar is mixed case
213 if Nam = "bar" then
214 Cas := Mixed_Case;
216 -- All names longer than 4 characters are mixed case
218 elsif Nam'Length > 4 then
219 Cas := Mixed_Case;
221 -- All names shorter than 4 characters (other than Bar,
222 -- which we already tested for specially) are Upper case.
224 else
225 Cas := All_Upper_Case;
226 end if;
227 end;
229 -- All other entities are in mixed case
231 else
232 Cas := Mixed_Case;
233 end if;
235 Nlen := Length_Of_Name (Chars (Ref));
237 -- Now check if we have the right casing
239 if Determine_Casing
240 (Tref (Sref .. Sref + Source_Ptr (Nlen) - 1)) = Cas
241 then
242 null;
243 else
244 Name_Len := Integer (Nlen);
245 Name_Buffer (1 .. Name_Len) :=
246 String (Tref (Sref .. Sref + Source_Ptr (Nlen) - 1));
247 Set_Casing (Cas);
248 Error_Msg_Name_1 := Name_Enter;
249 Error_Msg_N -- CODEFIX
250 ("(style) bad casing of %% declared in Standard", Ref);
251 end if;
252 end if;
253 end if;
254 end if;
255 end Check_Identifier;
257 ------------------------
258 -- Missing_Overriding --
259 ------------------------
261 procedure Missing_Overriding (N : Node_Id; E : Entity_Id) is
262 Nod : Node_Id;
264 begin
265 -- Perform the check on source subprograms and on subprogram instances,
266 -- because these can be primitives of untagged types. Note that such
267 -- indicators were introduced in Ada 2005. We apply Comes_From_Source
268 -- to Original_Node to catch the case of a procedure body declared with
269 -- "is null" that has been rewritten as a normal empty body.
271 if Style_Check_Missing_Overriding
272 and then (Comes_From_Source (Original_Node (N))
273 or else Is_Generic_Instance (E))
274 and then Ada_Version_Explicit >= Ada_2005
275 then
276 -- If the subprogram is an instantiation, its declaration appears
277 -- within a wrapper package that precedes the instance node. Place
278 -- warning on the node to avoid references to the original generic.
280 if Nkind (N) = N_Subprogram_Declaration
281 and then Is_Generic_Instance (E)
282 then
283 Nod := Next (Parent (Parent (List_Containing (N))));
284 else
285 Nod := N;
286 end if;
288 if Nkind (N) = N_Subprogram_Body then
289 Error_Msg_NE -- CODEFIX
290 ("(style) missing OVERRIDING indicator in body of&", N, E);
292 elsif Nkind (N) = N_Abstract_Subprogram_Declaration then
293 Error_Msg_NE -- CODEFIX
294 ("(style) missing OVERRIDING indicator in declaration of&",
295 Specification (N), E);
297 else
298 Error_Msg_NE -- CODEFIX
299 ("(style) missing OVERRIDING indicator in declaration of&",
300 Nod, E);
301 end if;
302 end if;
303 end Missing_Overriding;
305 -----------------------------------
306 -- Subprogram_Not_In_Alpha_Order --
307 -----------------------------------
309 procedure Subprogram_Not_In_Alpha_Order (Name : Node_Id) is
310 begin
311 if Style_Check_Order_Subprograms then
312 Error_Msg_N -- CODEFIX
313 ("(style) subprogram body& not in alphabetical order", Name);
314 end if;
315 end Subprogram_Not_In_Alpha_Order;
316 end Style;