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996ae0b0 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M _ C H 6 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
996ae0b0 | 8 | -- -- |
2c6336be | 9 | -- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- |
996ae0b0 RK |
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- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
996ae0b0 RK |
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 -- | |
b5c84c3c RD |
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. -- | |
996ae0b0 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
996ae0b0 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
80e59506 | 26 | with Aspects; use Aspects; |
996ae0b0 RK |
27 | with Atree; use Atree; |
28 | with Checks; use Checks; | |
29 | with Debug; use Debug; | |
30 | with Einfo; use Einfo; | |
31 | with Elists; use Elists; | |
32 | with Errout; use Errout; | |
33 | with Expander; use Expander; | |
ec4867fa | 34 | with Exp_Ch6; use Exp_Ch6; |
996ae0b0 | 35 | with Exp_Ch7; use Exp_Ch7; |
21d27997 | 36 | with Exp_Ch9; use Exp_Ch9; |
616547fa | 37 | with Exp_Dbug; use Exp_Dbug; |
ce2b6ba5 | 38 | with Exp_Disp; use Exp_Disp; |
e660dbf7 | 39 | with Exp_Tss; use Exp_Tss; |
ec4867fa | 40 | with Exp_Util; use Exp_Util; |
fbf5a39b | 41 | with Fname; use Fname; |
996ae0b0 | 42 | with Freeze; use Freeze; |
8636f52f | 43 | with Ghost; use Ghost; |
540d8610 | 44 | with Inline; use Inline; |
41251c60 | 45 | with Itypes; use Itypes; |
996ae0b0 | 46 | with Lib.Xref; use Lib.Xref; |
ec4867fa | 47 | with Layout; use Layout; |
996ae0b0 RK |
48 | with Namet; use Namet; |
49 | with Lib; use Lib; | |
50 | with Nlists; use Nlists; | |
51 | with Nmake; use Nmake; | |
52 | with Opt; use Opt; | |
53 | with Output; use Output; | |
b20de9b9 AC |
54 | with Restrict; use Restrict; |
55 | with Rident; use Rident; | |
996ae0b0 RK |
56 | with Rtsfind; use Rtsfind; |
57 | with Sem; use Sem; | |
a4100e55 | 58 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
59 | with Sem_Cat; use Sem_Cat; |
60 | with Sem_Ch3; use Sem_Ch3; | |
61 | with Sem_Ch4; use Sem_Ch4; | |
62 | with Sem_Ch5; use Sem_Ch5; | |
63 | with Sem_Ch8; use Sem_Ch8; | |
9bc856dd | 64 | with Sem_Ch10; use Sem_Ch10; |
996ae0b0 | 65 | with Sem_Ch12; use Sem_Ch12; |
0f1a6a0b | 66 | with Sem_Ch13; use Sem_Ch13; |
dec6faf1 | 67 | with Sem_Dim; use Sem_Dim; |
996ae0b0 RK |
68 | with Sem_Disp; use Sem_Disp; |
69 | with Sem_Dist; use Sem_Dist; | |
70 | with Sem_Elim; use Sem_Elim; | |
71 | with Sem_Eval; use Sem_Eval; | |
72 | with Sem_Mech; use Sem_Mech; | |
73 | with Sem_Prag; use Sem_Prag; | |
74 | with Sem_Res; use Sem_Res; | |
75 | with Sem_Util; use Sem_Util; | |
76 | with Sem_Type; use Sem_Type; | |
77 | with Sem_Warn; use Sem_Warn; | |
78 | with Sinput; use Sinput; | |
79 | with Stand; use Stand; | |
80 | with Sinfo; use Sinfo; | |
81 | with Sinfo.CN; use Sinfo.CN; | |
82 | with Snames; use Snames; | |
83 | with Stringt; use Stringt; | |
84 | with Style; | |
85 | with Stylesw; use Stylesw; | |
8417f4b2 | 86 | with Targparm; use Targparm; |
996ae0b0 RK |
87 | with Tbuild; use Tbuild; |
88 | with Uintp; use Uintp; | |
89 | with Urealp; use Urealp; | |
90 | with Validsw; use Validsw; | |
91 | ||
92 | package body Sem_Ch6 is | |
93 | ||
c8ef728f | 94 | May_Hide_Profile : Boolean := False; |
ec4867fa ES |
95 | -- This flag is used to indicate that two formals in two subprograms being |
96 | -- checked for conformance differ only in that one is an access parameter | |
97 | -- while the other is of a general access type with the same designated | |
98 | -- type. In this case, if the rest of the signatures match, a call to | |
99 | -- either subprogram may be ambiguous, which is worth a warning. The flag | |
100 | -- is set in Compatible_Types, and the warning emitted in | |
101 | -- New_Overloaded_Entity. | |
c8ef728f | 102 | |
996ae0b0 RK |
103 | ----------------------- |
104 | -- Local Subprograms -- | |
105 | ----------------------- | |
106 | ||
c9d70ab1 AC |
107 | procedure Analyze_Function_Return (N : Node_Id); |
108 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement | |
109 | -- applies to a [generic] function. | |
110 | ||
111 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); | |
112 | -- Analyze a generic subprogram body. N is the body to be analyzed, and | |
113 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
114 | ||
4d8f3296 ES |
115 | procedure Analyze_Null_Procedure |
116 | (N : Node_Id; | |
117 | Is_Completion : out Boolean); | |
9d2a2071 | 118 | -- A null procedure can be a declaration or (Ada 2012) a completion |
4d8f3296 | 119 | |
5d37ba92 | 120 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 121 | -- Common processing for simple and extended return statements |
ec4867fa | 122 | |
82c80734 RD |
123 | procedure Analyze_Return_Type (N : Node_Id); |
124 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 125 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
126 | -- outer homographs. |
127 | ||
b1b543d2 | 128 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
129 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
130 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 131 | |
806f6d37 AC |
132 | function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
133 | -- Returns true if Subp can override a predefined operator. | |
134 | ||
996ae0b0 | 135 | procedure Check_Conformance |
41251c60 JM |
136 | (New_Id : Entity_Id; |
137 | Old_Id : Entity_Id; | |
138 | Ctype : Conformance_Type; | |
139 | Errmsg : Boolean; | |
140 | Conforms : out Boolean; | |
141 | Err_Loc : Node_Id := Empty; | |
142 | Get_Inst : Boolean := False; | |
143 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
144 | -- Given two entities, this procedure checks that the profiles associated |
145 | -- with these entities meet the conformance criterion given by the third | |
146 | -- parameter. If they conform, Conforms is set True and control returns | |
147 | -- to the caller. If they do not conform, Conforms is set to False, and | |
148 | -- in addition, if Errmsg is True on the call, proper messages are output | |
149 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
150 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
151 | -- error messages are placed on the appropriate part of the construct | |
152 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
153 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
154 | -- be called. | |
155 | ||
156 | procedure Check_Subprogram_Order (N : Node_Id); | |
157 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
158 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
159 | ||
996ae0b0 RK |
160 | procedure Check_Returns |
161 | (HSS : Node_Id; | |
162 | Mode : Character; | |
c8ef728f ES |
163 | Err : out Boolean; |
164 | Proc : Entity_Id := Empty); | |
165 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 166 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
167 | -- handled statement sequence for the subprogram body. This procedure |
168 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
169 | -- used for functions) or do not have a return (Mode = 'P', used for | |
170 | -- No_Return procedures). The flag Err is set if there are any control | |
171 | -- paths not explicitly terminated by a return in the function case, and is | |
172 | -- True otherwise. Proc is the entity for the procedure case and is used | |
173 | -- in posting the warning message. | |
996ae0b0 | 174 | |
e5a58fac AC |
175 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
176 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
177 | -- must appear before the type is frozen, and have the same visibility as | |
178 | -- that of the type. This procedure checks that this rule is met, and | |
179 | -- otherwise emits an error on the subprogram declaration and a warning | |
b2834fbd AC |
180 | -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode, |
181 | -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier | |
182 | -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility | |
183 | -- is set, otherwise the call has no effect. | |
e5a58fac | 184 | |
996ae0b0 | 185 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
186 | -- This procedure makes S, a new overloaded entity, into the first visible |
187 | -- entity with that name. | |
996ae0b0 | 188 | |
a5b62485 AC |
189 | function Is_Non_Overriding_Operation |
190 | (Prev_E : Entity_Id; | |
191 | New_E : Entity_Id) return Boolean; | |
192 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
193 | -- overrides an inherited operation only if the corresponding operation | |
260359e3 AC |
194 | -- was overriding in the generic. This needs to be checked for primitive |
195 | -- operations of types derived (in the generic unit) from formal private | |
196 | -- or formal derived types. | |
a5b62485 | 197 | |
996ae0b0 RK |
198 | procedure Make_Inequality_Operator (S : Entity_Id); |
199 | -- Create the declaration for an inequality operator that is implicitly | |
200 | -- created by a user-defined equality operator that yields a boolean. | |
201 | ||
996ae0b0 RK |
202 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
203 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
204 | -- setting the proper validity status for this entity, which depends on |
205 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
206 | |
207 | --------------------------------------------- | |
208 | -- Analyze_Abstract_Subprogram_Declaration -- | |
209 | --------------------------------------------- | |
210 | ||
211 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
fbf5a39b AC |
212 | Designator : constant Entity_Id := |
213 | Analyze_Subprogram_Specification (Specification (N)); | |
996ae0b0 RK |
214 | Scop : constant Entity_Id := Current_Scope; |
215 | ||
216 | begin | |
8636f52f HK |
217 | -- The abstract subprogram declaration may be subject to pragma Ghost |
218 | -- with policy Ignore. Set the mode now to ensure that any nodes | |
219 | -- generated during analysis and expansion are properly flagged as | |
220 | -- ignored Ghost. | |
221 | ||
222 | Set_Ghost_Mode (N); | |
ce5ba43a | 223 | Check_SPARK_05_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 224 | |
996ae0b0 | 225 | Generate_Definition (Designator); |
c9d70ab1 | 226 | |
f937473f | 227 | Set_Is_Abstract_Subprogram (Designator); |
996ae0b0 RK |
228 | New_Overloaded_Entity (Designator); |
229 | Check_Delayed_Subprogram (Designator); | |
230 | ||
fbf5a39b | 231 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 | 232 | |
8636f52f | 233 | -- An abstract subprogram declared within a Ghost region is rendered |
c5cec2fe AC |
234 | -- Ghost (SPARK RM 6.9(2)). |
235 | ||
8636f52f | 236 | if Comes_From_Source (Designator) and then Ghost_Mode > None then |
c5cec2fe AC |
237 | Set_Is_Ghost_Entity (Designator); |
238 | end if; | |
239 | ||
996ae0b0 RK |
240 | if Ekind (Scope (Designator)) = E_Protected_Type then |
241 | Error_Msg_N | |
242 | ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
243 | |
244 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
245 | -- operation nor an operation that overrides an inherited subprogram or | |
246 | -- predefined operator, since this most likely indicates a mistake. | |
247 | ||
248 | elsif Warn_On_Redundant_Constructs | |
249 | and then not Is_Dispatching_Operation (Designator) | |
038140ed | 250 | and then not Present (Overridden_Operation (Designator)) |
5d37ba92 ES |
251 | and then (not Is_Operator_Symbol_Name (Chars (Designator)) |
252 | or else Scop /= Scope (Etype (First_Formal (Designator)))) | |
253 | then | |
254 | Error_Msg_N | |
dbfeb4fa | 255 | ("abstract subprogram is not dispatching or overriding?r?", N); |
996ae0b0 | 256 | end if; |
fbf5a39b AC |
257 | |
258 | Generate_Reference_To_Formals (Designator); | |
361effb1 | 259 | Check_Eliminated (Designator); |
eaba57fb RD |
260 | |
261 | if Has_Aspects (N) then | |
262 | Analyze_Aspect_Specifications (N, Designator); | |
263 | end if; | |
996ae0b0 RK |
264 | end Analyze_Abstract_Subprogram_Declaration; |
265 | ||
b0186f71 AC |
266 | --------------------------------- |
267 | -- Analyze_Expression_Function -- | |
268 | --------------------------------- | |
269 | ||
270 | procedure Analyze_Expression_Function (N : Node_Id) is | |
271 | Loc : constant Source_Ptr := Sloc (N); | |
272 | LocX : constant Source_Ptr := Sloc (Expression (N)); | |
0b5b2bbc | 273 | Expr : constant Node_Id := Expression (N); |
d2d4b355 AC |
274 | Spec : constant Node_Id := Specification (N); |
275 | ||
8a06151a | 276 | Def_Id : Entity_Id; |
b0186f71 | 277 | |
8a06151a | 278 | Prev : Entity_Id; |
b0186f71 | 279 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
280 | -- declaration is completed. Def_Id is needed to analyze the spec. |
281 | ||
282 | New_Body : Node_Id; | |
d2d4b355 | 283 | New_Spec : Node_Id; |
b913199e | 284 | Ret : Node_Id; |
b0186f71 AC |
285 | |
286 | begin | |
287 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 288 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
289 | -- function into an equivalent subprogram body, and analyze it. |
290 | ||
291 | -- Expression functions are inlined unconditionally. The back-end will | |
292 | -- determine whether this is possible. | |
293 | ||
294 | Inline_Processing_Required := True; | |
b727a82b AC |
295 | |
296 | -- Create a specification for the generated body. Types and defauts in | |
297 | -- the profile are copies of the spec, but new entities must be created | |
298 | -- for the unit name and the formals. | |
299 | ||
300 | New_Spec := New_Copy_Tree (Spec); | |
301 | Set_Defining_Unit_Name (New_Spec, | |
302 | Make_Defining_Identifier (Sloc (Defining_Unit_Name (Spec)), | |
303 | Chars (Defining_Unit_Name (Spec)))); | |
304 | ||
305 | if Present (Parameter_Specifications (New_Spec)) then | |
306 | declare | |
307 | Formal_Spec : Node_Id; | |
a6abfd78 AC |
308 | Def : Entity_Id; |
309 | ||
b727a82b AC |
310 | begin |
311 | Formal_Spec := First (Parameter_Specifications (New_Spec)); | |
b2afe274 AC |
312 | |
313 | -- Create a new formal parameter at the same source position | |
314 | ||
b727a82b | 315 | while Present (Formal_Spec) loop |
a6abfd78 AC |
316 | Def := Defining_Identifier (Formal_Spec); |
317 | Set_Defining_Identifier (Formal_Spec, | |
318 | Make_Defining_Identifier (Sloc (Def), | |
319 | Chars => Chars (Def))); | |
b727a82b AC |
320 | Next (Formal_Spec); |
321 | end loop; | |
322 | end; | |
323 | end if; | |
324 | ||
51597c23 | 325 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); |
d2d4b355 AC |
326 | |
327 | -- If there are previous overloadable entities with the same name, | |
328 | -- check whether any of them is completed by the expression function. | |
b04d926e | 329 | -- In a generic context a formal subprogram has no completion. |
d2d4b355 | 330 | |
4b6f99f5 RD |
331 | if Present (Prev) |
332 | and then Is_Overloadable (Prev) | |
b04d926e AC |
333 | and then not Is_Formal_Subprogram (Prev) |
334 | then | |
51597c23 AC |
335 | Def_Id := Analyze_Subprogram_Specification (Spec); |
336 | Prev := Find_Corresponding_Spec (N); | |
35e7063a AC |
337 | |
338 | -- The previous entity may be an expression function as well, in | |
339 | -- which case the redeclaration is illegal. | |
340 | ||
341 | if Present (Prev) | |
5073ad7a AC |
342 | and then Nkind (Original_Node (Unit_Declaration_Node (Prev))) = |
343 | N_Expression_Function | |
35e7063a | 344 | then |
bc5e261c ES |
345 | Error_Msg_Sloc := Sloc (Prev); |
346 | Error_Msg_N ("& conflicts with declaration#", Def_Id); | |
35e7063a AC |
347 | return; |
348 | end if; | |
d2d4b355 | 349 | end if; |
b0186f71 | 350 | |
b913199e AC |
351 | Ret := Make_Simple_Return_Statement (LocX, Expression (N)); |
352 | ||
b0186f71 AC |
353 | New_Body := |
354 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 355 | Specification => New_Spec, |
b0186f71 AC |
356 | Declarations => Empty_List, |
357 | Handled_Statement_Sequence => | |
358 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 359 | Statements => New_List (Ret))); |
b0186f71 | 360 | |
e7f23f06 AC |
361 | -- If the expression completes a generic subprogram, we must create a |
362 | -- separate node for the body, because at instantiation the original | |
363 | -- node of the generic copy must be a generic subprogram body, and | |
364 | -- cannot be a expression function. Otherwise we just rewrite the | |
365 | -- expression with the non-generic body. | |
366 | ||
6d7e5c54 | 367 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
e7f23f06 | 368 | Insert_After (N, New_Body); |
6d7e5c54 | 369 | |
e7f23f06 AC |
370 | -- Propagate any aspects or pragmas that apply to the expression |
371 | -- function to the proper body when the expression function acts | |
372 | -- as a completion. | |
373 | ||
374 | if Has_Aspects (N) then | |
375 | Move_Aspects (N, To => New_Body); | |
376 | end if; | |
377 | ||
378 | Relocate_Pragmas_To_Body (New_Body); | |
b0186f71 | 379 | |
b0186f71 | 380 | Rewrite (N, Make_Null_Statement (Loc)); |
d2d4b355 | 381 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
382 | Analyze (N); |
383 | Analyze (New_Body); | |
d2b10647 | 384 | Set_Is_Inlined (Prev); |
b0186f71 | 385 | |
e5c4e2bc AC |
386 | -- If the expression function is a completion, the previous declaration |
387 | -- must come from source. We know already that appears in the current | |
388 | -- scope. The entity itself may be internally created if within a body | |
389 | -- to be inlined. | |
390 | ||
4b6f99f5 RD |
391 | elsif Present (Prev) |
392 | and then Comes_From_Source (Parent (Prev)) | |
b04d926e AC |
393 | and then not Is_Formal_Subprogram (Prev) |
394 | then | |
d2d4b355 | 395 | Set_Has_Completion (Prev, False); |
76264f60 | 396 | |
c6d2191a AC |
397 | -- An expression function that is a completion freezes the |
398 | -- expression. This means freezing the return type, and if it is | |
399 | -- an access type, freezing its designated type as well. | |
1b31321b | 400 | |
c6d2191a | 401 | -- Note that we cannot defer this freezing to the analysis of the |
1b31321b AC |
402 | -- expression itself, because a freeze node might appear in a nested |
403 | -- scope, leading to an elaboration order issue in gigi. | |
c6d2191a AC |
404 | |
405 | Freeze_Before (N, Etype (Prev)); | |
1b31321b | 406 | |
c6d2191a AC |
407 | if Is_Access_Type (Etype (Prev)) then |
408 | Freeze_Before (N, Designated_Type (Etype (Prev))); | |
409 | end if; | |
410 | ||
76264f60 AC |
411 | -- For navigation purposes, indicate that the function is a body |
412 | ||
413 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 414 | Rewrite (N, New_Body); |
e7f23f06 | 415 | |
c0cdbd39 AC |
416 | -- Correct the parent pointer of the aspect specification list to |
417 | -- reference the rewritten node. | |
418 | ||
419 | if Has_Aspects (N) then | |
420 | Set_Parent (Aspect_Specifications (N), N); | |
421 | end if; | |
422 | ||
e7f23f06 AC |
423 | -- Propagate any pragmas that apply to the expression function to the |
424 | -- proper body when the expression function acts as a completion. | |
425 | -- Aspects are automatically transfered because of node rewriting. | |
426 | ||
427 | Relocate_Pragmas_To_Body (N); | |
d2b10647 ES |
428 | Analyze (N); |
429 | ||
6d7e5c54 AC |
430 | -- Prev is the previous entity with the same name, but it is can |
431 | -- be an unrelated spec that is not completed by the expression | |
432 | -- function. In that case the relevant entity is the one in the body. | |
433 | -- Not clear that the backend can inline it in this case ??? | |
434 | ||
435 | if Has_Completion (Prev) then | |
436 | Set_Is_Inlined (Prev); | |
31af8899 AC |
437 | |
438 | -- The formals of the expression function are body formals, | |
439 | -- and do not appear in the ali file, which will only contain | |
440 | -- references to the formals of the original subprogram spec. | |
441 | ||
442 | declare | |
443 | F1 : Entity_Id; | |
444 | F2 : Entity_Id; | |
445 | ||
446 | begin | |
447 | F1 := First_Formal (Def_Id); | |
448 | F2 := First_Formal (Prev); | |
449 | ||
450 | while Present (F1) loop | |
451 | Set_Spec_Entity (F1, F2); | |
452 | Next_Formal (F1); | |
453 | Next_Formal (F2); | |
454 | end loop; | |
455 | end; | |
456 | ||
6d7e5c54 AC |
457 | else |
458 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
459 | end if; | |
460 | ||
0b5b2bbc | 461 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 462 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
463 | |
464 | else | |
a52e6d7e AC |
465 | -- An expression function that is not a completion is not a |
466 | -- subprogram declaration, and thus cannot appear in a protected | |
467 | -- definition. | |
468 | ||
469 | if Nkind (Parent (N)) = N_Protected_Definition then | |
470 | Error_Msg_N | |
471 | ("an expression function is not a legal protected operation", N); | |
472 | end if; | |
473 | ||
b8e6830b | 474 | Rewrite (N, Make_Subprogram_Declaration (Loc, Specification => Spec)); |
c0cdbd39 AC |
475 | |
476 | -- Correct the parent pointer of the aspect specification list to | |
477 | -- reference the rewritten node. | |
478 | ||
479 | if Has_Aspects (N) then | |
480 | Set_Parent (Aspect_Specifications (N), N); | |
481 | end if; | |
482 | ||
b0186f71 | 483 | Analyze (N); |
b04d926e | 484 | |
e699b76e AC |
485 | -- Within a generic pre-analyze the original expression for name |
486 | -- capture. The body is also generated but plays no role in | |
487 | -- this because it is not part of the original source. | |
b04d926e AC |
488 | |
489 | if Inside_A_Generic then | |
490 | declare | |
491 | Id : constant Entity_Id := Defining_Entity (N); | |
b04d926e AC |
492 | |
493 | begin | |
494 | Set_Has_Completion (Id); | |
b04d926e AC |
495 | Push_Scope (Id); |
496 | Install_Formals (Id); | |
e699b76e | 497 | Preanalyze_Spec_Expression (Expr, Etype (Id)); |
b04d926e | 498 | End_Scope; |
b04d926e AC |
499 | end; |
500 | end if; | |
501 | ||
b8e6830b AC |
502 | Set_Is_Inlined (Defining_Entity (N)); |
503 | ||
504 | -- Establish the linkages between the spec and the body. These are | |
505 | -- used when the expression function acts as the prefix of attribute | |
506 | -- 'Access in order to freeze the original expression which has been | |
507 | -- moved to the generated body. | |
508 | ||
509 | Set_Corresponding_Body (N, Defining_Entity (New_Body)); | |
510 | Set_Corresponding_Spec (New_Body, Defining_Entity (N)); | |
d2b10647 | 511 | |
6d7e5c54 AC |
512 | -- To prevent premature freeze action, insert the new body at the end |
513 | -- of the current declarations, or at the end of the package spec. | |
b913199e | 514 | -- However, resolve usage names now, to prevent spurious visibility |
ad4e3362 ES |
515 | -- on later entities. Note that the function can now be called in |
516 | -- the current declarative part, which will appear to be prior to | |
517 | -- the presence of the body in the code. There are nevertheless no | |
518 | -- order of elaboration issues because all name resolution has taken | |
519 | -- place at the point of declaration. | |
6d7e5c54 AC |
520 | |
521 | declare | |
e876c43a AC |
522 | Decls : List_Id := List_Containing (N); |
523 | Par : constant Node_Id := Parent (Decls); | |
b8e6830b | 524 | Id : constant Entity_Id := Defining_Entity (N); |
6d7e5c54 AC |
525 | |
526 | begin | |
fce54763 AC |
527 | -- If this is a wrapper created for in an instance for a formal |
528 | -- subprogram, insert body after declaration, to be analyzed when | |
529 | -- the enclosing instance is analyzed. | |
530 | ||
531 | if GNATprove_Mode | |
532 | and then Is_Generic_Actual_Subprogram (Defining_Entity (N)) | |
6d7e5c54 | 533 | then |
fce54763 AC |
534 | Insert_After (N, New_Body); |
535 | ||
536 | else | |
537 | if Nkind (Par) = N_Package_Specification | |
538 | and then Decls = Visible_Declarations (Par) | |
539 | and then Present (Private_Declarations (Par)) | |
540 | and then not Is_Empty_List (Private_Declarations (Par)) | |
541 | then | |
542 | Decls := Private_Declarations (Par); | |
543 | end if; | |
6d7e5c54 | 544 | |
fce54763 AC |
545 | Insert_After (Last (Decls), New_Body); |
546 | Push_Scope (Id); | |
547 | Install_Formals (Id); | |
3a8e3f63 | 548 | |
fce54763 AC |
549 | -- Preanalyze the expression for name capture, except in an |
550 | -- instance, where this has been done during generic analysis, | |
551 | -- and will be redone when analyzing the body. | |
845f06e2 | 552 | |
fce54763 AC |
553 | declare |
554 | Expr : constant Node_Id := Expression (Ret); | |
4058ddcc | 555 | |
fce54763 AC |
556 | begin |
557 | Set_Parent (Expr, Ret); | |
4058ddcc | 558 | |
fce54763 AC |
559 | if not In_Instance then |
560 | Preanalyze_Spec_Expression (Expr, Etype (Id)); | |
561 | end if; | |
562 | end; | |
3a8e3f63 | 563 | |
fce54763 AC |
564 | End_Scope; |
565 | end if; | |
6d7e5c54 | 566 | end; |
b0186f71 | 567 | end if; |
0b5b2bbc AC |
568 | |
569 | -- If the return expression is a static constant, we suppress warning | |
570 | -- messages on unused formals, which in most cases will be noise. | |
571 | ||
572 | Set_Is_Trivial_Subprogram (Defining_Entity (New_Body), | |
573 | Is_OK_Static_Expression (Expr)); | |
b0186f71 AC |
574 | end Analyze_Expression_Function; |
575 | ||
ec4867fa ES |
576 | ---------------------------------------- |
577 | -- Analyze_Extended_Return_Statement -- | |
578 | ---------------------------------------- | |
579 | ||
580 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
581 | begin | |
c86cf714 | 582 | Check_Compiler_Unit ("extended return statement", N); |
5d37ba92 | 583 | Analyze_Return_Statement (N); |
ec4867fa ES |
584 | end Analyze_Extended_Return_Statement; |
585 | ||
996ae0b0 RK |
586 | ---------------------------- |
587 | -- Analyze_Function_Call -- | |
588 | ---------------------------- | |
589 | ||
590 | procedure Analyze_Function_Call (N : Node_Id) is | |
a7e68e7f HK |
591 | Actuals : constant List_Id := Parameter_Associations (N); |
592 | Func_Nam : constant Node_Id := Name (N); | |
593 | Actual : Node_Id; | |
594 | ||
996ae0b0 | 595 | begin |
a7e68e7f | 596 | Analyze (Func_Nam); |
996ae0b0 | 597 | |
3e7302c3 AC |
598 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
599 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
600 | -- has been analyzed and we just return. | |
82c80734 | 601 | |
a7e68e7f HK |
602 | if Nkind (Func_Nam) = N_Selected_Component |
603 | and then Name (N) /= Func_Nam | |
82c80734 RD |
604 | and then Is_Rewrite_Substitution (N) |
605 | and then Present (Etype (N)) | |
606 | then | |
607 | return; | |
608 | end if; | |
609 | ||
996ae0b0 RK |
610 | -- If error analyzing name, then set Any_Type as result type and return |
611 | ||
a7e68e7f | 612 | if Etype (Func_Nam) = Any_Type then |
996ae0b0 RK |
613 | Set_Etype (N, Any_Type); |
614 | return; | |
615 | end if; | |
616 | ||
617 | -- Otherwise analyze the parameters | |
618 | ||
e24329cd YM |
619 | if Present (Actuals) then |
620 | Actual := First (Actuals); | |
996ae0b0 RK |
621 | while Present (Actual) loop |
622 | Analyze (Actual); | |
623 | Check_Parameterless_Call (Actual); | |
624 | Next (Actual); | |
625 | end loop; | |
626 | end if; | |
627 | ||
628 | Analyze_Call (N); | |
996ae0b0 RK |
629 | end Analyze_Function_Call; |
630 | ||
ec4867fa ES |
631 | ----------------------------- |
632 | -- Analyze_Function_Return -- | |
633 | ----------------------------- | |
634 | ||
635 | procedure Analyze_Function_Return (N : Node_Id) is | |
a7e68e7f HK |
636 | Loc : constant Source_Ptr := Sloc (N); |
637 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
638 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
ec4867fa | 639 | |
5d37ba92 | 640 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
641 | -- Function result subtype |
642 | ||
643 | procedure Check_Limited_Return (Expr : Node_Id); | |
644 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
645 | -- limited types. Used only for simple return statements. | |
646 | -- Expr is the expression returned. | |
647 | ||
648 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
649 | -- Check that the return_subtype_indication properly matches the result | |
650 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
651 | ||
652 | -------------------------- | |
653 | -- Check_Limited_Return -- | |
654 | -------------------------- | |
655 | ||
656 | procedure Check_Limited_Return (Expr : Node_Id) is | |
657 | begin | |
658 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
659 | -- removed and replaced by anonymous access results. This is an | |
660 | -- incompatibility with Ada 95. Not clear whether this should be | |
661 | -- enforced yet or perhaps controllable with special switch. ??? | |
662 | ||
ce72a9a3 AC |
663 | -- A limited interface that is not immutably limited is OK. |
664 | ||
665 | if Is_Limited_Interface (R_Type) | |
666 | and then | |
667 | not (Is_Task_Interface (R_Type) | |
668 | or else Is_Protected_Interface (R_Type) | |
669 | or else Is_Synchronized_Interface (R_Type)) | |
670 | then | |
671 | null; | |
672 | ||
673 | elsif Is_Limited_Type (R_Type) | |
674 | and then not Is_Interface (R_Type) | |
ec4867fa ES |
675 | and then Comes_From_Source (N) |
676 | and then not In_Instance_Body | |
2a31c32b | 677 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
678 | then |
679 | -- Error in Ada 2005 | |
680 | ||
0791fbe9 | 681 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
682 | and then not Debug_Flag_Dot_L |
683 | and then not GNAT_Mode | |
684 | then | |
685 | Error_Msg_N | |
3ccedacc AC |
686 | ("(Ada 2005) cannot copy object of a limited type " |
687 | & "(RM-2005 6.5(5.5/2))", Expr); | |
e0ae93e2 | 688 | |
51245e2d | 689 | if Is_Limited_View (R_Type) then |
ec4867fa ES |
690 | Error_Msg_N |
691 | ("\return by reference not permitted in Ada 2005", Expr); | |
692 | end if; | |
693 | ||
694 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
695 | -- incompatibility. | |
696 | ||
697 | -- In GNAT mode, this is just a warning, to allow it to be | |
698 | -- evilly turned off. Otherwise it is a real error. | |
699 | ||
9694c039 AC |
700 | -- In a generic context, simplify the warning because it makes |
701 | -- no sense to discuss pass-by-reference or copy. | |
702 | ||
ec4867fa | 703 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
704 | if Inside_A_Generic then |
705 | Error_Msg_N | |
885c4871 | 706 | ("return of limited object not permitted in Ada 2005 " |
dbfeb4fa | 707 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
9694c039 | 708 | |
51245e2d | 709 | elsif Is_Limited_View (R_Type) then |
ec4867fa | 710 | Error_Msg_N |
20261dc1 | 711 | ("return by reference not permitted in Ada 2005 " |
dbfeb4fa | 712 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
713 | else |
714 | Error_Msg_N | |
20261dc1 | 715 | ("cannot copy object of a limited type in Ada 2005 " |
dbfeb4fa | 716 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
717 | end if; |
718 | ||
719 | -- Ada 95 mode, compatibility warnings disabled | |
720 | ||
721 | else | |
722 | return; -- skip continuation messages below | |
723 | end if; | |
724 | ||
9694c039 AC |
725 | if not Inside_A_Generic then |
726 | Error_Msg_N | |
727 | ("\consider switching to return of access type", Expr); | |
728 | Explain_Limited_Type (R_Type, Expr); | |
729 | end if; | |
ec4867fa ES |
730 | end if; |
731 | end Check_Limited_Return; | |
732 | ||
733 | ------------------------------------- | |
734 | -- Check_Return_Subtype_Indication -- | |
735 | ------------------------------------- | |
736 | ||
737 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
738 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
739 | ||
740 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
741 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
742 | |
743 | Subtype_Ind : constant Node_Id := | |
744 | Object_Definition (Original_Node (Obj_Decl)); | |
745 | ||
7f568bfa AC |
746 | R_Type_Is_Anon_Access : constant Boolean := |
747 | Ekind_In (R_Type, | |
748 | E_Anonymous_Access_Subprogram_Type, | |
749 | E_Anonymous_Access_Protected_Subprogram_Type, | |
750 | E_Anonymous_Access_Type); | |
ec4867fa ES |
751 | -- True if return type of the function is an anonymous access type |
752 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
753 | ||
7f568bfa AC |
754 | R_Stm_Type_Is_Anon_Access : constant Boolean := |
755 | Ekind_In (R_Stm_Type, | |
756 | E_Anonymous_Access_Subprogram_Type, | |
757 | E_Anonymous_Access_Protected_Subprogram_Type, | |
758 | E_Anonymous_Access_Type); | |
ec4867fa ES |
759 | -- True if type of the return object is an anonymous access type |
760 | ||
7f568bfa AC |
761 | procedure Error_No_Match (N : Node_Id); |
762 | -- Output error messages for case where types do not statically | |
763 | -- match. N is the location for the messages. | |
764 | ||
765 | -------------------- | |
766 | -- Error_No_Match -- | |
767 | -------------------- | |
768 | ||
769 | procedure Error_No_Match (N : Node_Id) is | |
770 | begin | |
771 | Error_Msg_N | |
772 | ("subtype must statically match function result subtype", N); | |
773 | ||
774 | if not Predicates_Match (R_Stm_Type, R_Type) then | |
775 | Error_Msg_Node_2 := R_Type; | |
776 | Error_Msg_NE | |
3ccedacc | 777 | ("\predicate of& does not match predicate of&", |
7f568bfa AC |
778 | N, R_Stm_Type); |
779 | end if; | |
780 | end Error_No_Match; | |
781 | ||
782 | -- Start of processing for Check_Return_Subtype_Indication | |
783 | ||
ec4867fa | 784 | begin |
7665e4bd | 785 | -- First, avoid cascaded errors |
ec4867fa ES |
786 | |
787 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
788 | return; | |
789 | end if; | |
790 | ||
791 | -- "return access T" case; check that the return statement also has | |
792 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 793 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
794 | |
795 | if R_Type_Is_Anon_Access then | |
796 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
797 | if |
798 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 799 | then |
53cf4600 ES |
800 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
801 | Base_Type (Designated_Type (R_Type)) | |
802 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
803 | then | |
7f568bfa | 804 | Error_No_Match (Subtype_Mark (Subtype_Ind)); |
53cf4600 ES |
805 | end if; |
806 | ||
807 | else | |
808 | -- For two anonymous access to subprogram types, the | |
809 | -- types themselves must be type conformant. | |
810 | ||
811 | if not Conforming_Types | |
812 | (R_Stm_Type, R_Type, Fully_Conformant) | |
813 | then | |
7f568bfa | 814 | Error_No_Match (Subtype_Ind); |
53cf4600 | 815 | end if; |
ec4867fa | 816 | end if; |
0a36105d | 817 | |
ec4867fa ES |
818 | else |
819 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
820 | end if; | |
821 | ||
6cce2156 GD |
822 | -- If the return object is of an anonymous access type, then report |
823 | -- an error if the function's result type is not also anonymous. | |
824 | ||
825 | elsif R_Stm_Type_Is_Anon_Access | |
826 | and then not R_Type_Is_Anon_Access | |
827 | then | |
3ccedacc AC |
828 | Error_Msg_N ("anonymous access not allowed for function with " |
829 | & "named access result", Subtype_Ind); | |
6cce2156 | 830 | |
81d93365 AC |
831 | -- Subtype indication case: check that the return object's type is |
832 | -- covered by the result type, and that the subtypes statically match | |
833 | -- when the result subtype is constrained. Also handle record types | |
834 | -- with unknown discriminants for which we have built the underlying | |
835 | -- record view. Coverage is needed to allow specific-type return | |
836 | -- objects when the result type is class-wide (see AI05-32). | |
837 | ||
838 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 839 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
840 | and then |
841 | Covers | |
842 | (Base_Type (R_Type), | |
843 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
844 | then |
845 | -- A null exclusion may be present on the return type, on the | |
846 | -- function specification, on the object declaration or on the | |
847 | -- subtype itself. | |
ec4867fa | 848 | |
21d27997 RD |
849 | if Is_Access_Type (R_Type) |
850 | and then | |
851 | (Can_Never_Be_Null (R_Type) | |
852 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
853 | Can_Never_Be_Null (R_Stm_Type) | |
854 | then | |
7f568bfa | 855 | Error_No_Match (Subtype_Ind); |
21d27997 RD |
856 | end if; |
857 | ||
105b5e65 | 858 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
859 | |
860 | if Is_Constrained (R_Type) | |
861 | or else Is_Access_Type (R_Type) | |
862 | then | |
ec4867fa | 863 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
7f568bfa | 864 | Error_No_Match (Subtype_Ind); |
ec4867fa ES |
865 | end if; |
866 | end if; | |
867 | ||
a8b346d2 RD |
868 | -- All remaining cases are illegal |
869 | ||
870 | -- Note: previous versions of this subprogram allowed the return | |
871 | -- value to be the ancestor of the return type if the return type | |
872 | -- was a null extension. This was plainly incorrect. | |
ff7139c3 | 873 | |
ec4867fa ES |
874 | else |
875 | Error_Msg_N | |
876 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
877 | end if; | |
878 | end Check_Return_Subtype_Indication; | |
879 | ||
880 | --------------------- | |
881 | -- Local Variables -- | |
882 | --------------------- | |
883 | ||
445e5888 AC |
884 | Expr : Node_Id; |
885 | Obj_Decl : Node_Id; | |
ec4867fa ES |
886 | |
887 | -- Start of processing for Analyze_Function_Return | |
888 | ||
889 | begin | |
890 | Set_Return_Present (Scope_Id); | |
891 | ||
5d37ba92 | 892 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 893 | Expr := Expression (N); |
4ee646da | 894 | |
e917aec2 RD |
895 | -- Guard against a malformed expression. The parser may have tried to |
896 | -- recover but the node is not analyzable. | |
4ee646da AC |
897 | |
898 | if Nkind (Expr) = N_Error then | |
899 | Set_Etype (Expr, Any_Type); | |
900 | Expander_Mode_Save_And_Set (False); | |
901 | return; | |
902 | ||
903 | else | |
0180fd26 AC |
904 | -- The resolution of a controlled [extension] aggregate associated |
905 | -- with a return statement creates a temporary which needs to be | |
906 | -- finalized on function exit. Wrap the return statement inside a | |
907 | -- block so that the finalization machinery can detect this case. | |
908 | -- This early expansion is done only when the return statement is | |
909 | -- not part of a handled sequence of statements. | |
910 | ||
911 | if Nkind_In (Expr, N_Aggregate, | |
912 | N_Extension_Aggregate) | |
913 | and then Needs_Finalization (R_Type) | |
914 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
915 | then | |
916 | Rewrite (N, | |
917 | Make_Block_Statement (Loc, | |
918 | Handled_Statement_Sequence => | |
919 | Make_Handled_Sequence_Of_Statements (Loc, | |
920 | Statements => New_List (Relocate_Node (N))))); | |
921 | ||
922 | Analyze (N); | |
923 | return; | |
924 | end if; | |
925 | ||
4b963531 AC |
926 | Analyze (Expr); |
927 | ||
928 | -- Ada 2005 (AI-251): If the type of the returned object is | |
929 | -- an access to an interface type then we add an implicit type | |
930 | -- conversion to force the displacement of the "this" pointer to | |
931 | -- reference the secondary dispatch table. We cannot delay the | |
932 | -- generation of this implicit conversion until the expansion | |
933 | -- because in this case the type resolution changes the decoration | |
934 | -- of the expression node to match R_Type; by contrast, if the | |
935 | -- returned object is a class-wide interface type then it is too | |
936 | -- early to generate here the implicit conversion since the return | |
937 | -- statement may be rewritten by the expander into an extended | |
938 | -- return statement whose expansion takes care of adding the | |
939 | -- implicit type conversion to displace the pointer to the object. | |
940 | ||
941 | if Expander_Active | |
942 | and then Serious_Errors_Detected = 0 | |
943 | and then Is_Access_Type (R_Type) | |
944 | and then Nkind (Expr) /= N_Null | |
945 | and then Is_Interface (Designated_Type (R_Type)) | |
946 | and then Is_Progenitor (Designated_Type (R_Type), | |
947 | Designated_Type (Etype (Expr))) | |
948 | then | |
73e5aa55 | 949 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); |
4b963531 AC |
950 | Analyze (Expr); |
951 | end if; | |
952 | ||
953 | Resolve (Expr, R_Type); | |
4ee646da AC |
954 | Check_Limited_Return (Expr); |
955 | end if; | |
ec4867fa | 956 | |
ad05f2e9 | 957 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 958 | |
fe5d3068 | 959 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
960 | and then |
961 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 962 | or else Present (Next (N))) |
607d0635 | 963 | then |
ce5ba43a | 964 | Check_SPARK_05_Restriction |
fe5d3068 | 965 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
966 | end if; |
967 | ||
ec4867fa | 968 | else |
ce5ba43a | 969 | Check_SPARK_05_Restriction ("extended RETURN is not allowed", N); |
445e5888 | 970 | Obj_Decl := Last (Return_Object_Declarations (N)); |
607d0635 | 971 | |
ec4867fa ES |
972 | -- Analyze parts specific to extended_return_statement: |
973 | ||
974 | declare | |
de6cad7c | 975 | Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
b9daa96e | 976 | HSS : constant Node_Id := Handled_Statement_Sequence (N); |
ec4867fa ES |
977 | |
978 | begin | |
979 | Expr := Expression (Obj_Decl); | |
980 | ||
981 | -- Note: The check for OK_For_Limited_Init will happen in | |
982 | -- Analyze_Object_Declaration; we treat it as a normal | |
983 | -- object declaration. | |
984 | ||
cd1c668b | 985 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
986 | Analyze (Obj_Decl); |
987 | ||
ec4867fa ES |
988 | Check_Return_Subtype_Indication (Obj_Decl); |
989 | ||
990 | if Present (HSS) then | |
991 | Analyze (HSS); | |
992 | ||
993 | if Present (Exception_Handlers (HSS)) then | |
994 | ||
995 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
996 | -- Probably by creating an actual N_Block_Statement. | |
997 | -- Probably in Expand. | |
998 | ||
999 | null; | |
1000 | end if; | |
1001 | end if; | |
1002 | ||
9337aa0a AC |
1003 | -- Mark the return object as referenced, since the return is an |
1004 | -- implicit reference of the object. | |
1005 | ||
1006 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
1007 | ||
ec4867fa | 1008 | Check_References (Stm_Entity); |
de6cad7c AC |
1009 | |
1010 | -- Check RM 6.5 (5.9/3) | |
1011 | ||
1012 | if Has_Aliased then | |
1013 | if Ada_Version < Ada_2012 then | |
dbfeb4fa RD |
1014 | |
1015 | -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? | |
1016 | -- Can it really happen (extended return???) | |
1017 | ||
1018 | Error_Msg_N | |
b785e0b8 AC |
1019 | ("aliased only allowed for limited return objects " |
1020 | & "in Ada 2012??", N); | |
de6cad7c | 1021 | |
51245e2d | 1022 | elsif not Is_Limited_View (R_Type) then |
3ccedacc AC |
1023 | Error_Msg_N |
1024 | ("aliased only allowed for limited return objects", N); | |
de6cad7c AC |
1025 | end if; |
1026 | end if; | |
ec4867fa ES |
1027 | end; |
1028 | end if; | |
1029 | ||
21d27997 | 1030 | -- Case of Expr present |
5d37ba92 | 1031 | |
ec4867fa | 1032 | if Present (Expr) |
21d27997 | 1033 | |
8fde064e | 1034 | -- Defend against previous errors |
21d27997 RD |
1035 | |
1036 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 1037 | and then Present (Etype (Expr)) |
ec4867fa | 1038 | then |
5d37ba92 ES |
1039 | -- Apply constraint check. Note that this is done before the implicit |
1040 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 1041 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
1042 | -- with null-excluding expressions found in return statements. |
1043 | ||
1044 | Apply_Constraint_Check (Expr, R_Type); | |
1045 | ||
1046 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
1047 | -- type, apply an implicit conversion of the expression to that type | |
1048 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 1049 | |
0791fbe9 | 1050 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
1051 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
1052 | then | |
1053 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
1054 | Analyze_And_Resolve (Expr, R_Type); | |
b6b5cca8 AC |
1055 | |
1056 | -- If this is a local anonymous access to subprogram, the | |
1057 | -- accessibility check can be applied statically. The return is | |
1058 | -- illegal if the access type of the return expression is declared | |
1059 | -- inside of the subprogram (except if it is the subtype indication | |
1060 | -- of an extended return statement). | |
1061 | ||
1062 | elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then | |
1063 | if not Comes_From_Source (Current_Scope) | |
1064 | or else Ekind (Current_Scope) = E_Return_Statement | |
1065 | then | |
1066 | null; | |
1067 | ||
1068 | elsif | |
1069 | Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) | |
1070 | then | |
1071 | Error_Msg_N ("cannot return local access to subprogram", N); | |
1072 | end if; | |
1ebc2612 AC |
1073 | |
1074 | -- The expression cannot be of a formal incomplete type | |
1075 | ||
1076 | elsif Ekind (Etype (Expr)) = E_Incomplete_Type | |
1077 | and then Is_Generic_Type (Etype (Expr)) | |
1078 | then | |
1079 | Error_Msg_N | |
1080 | ("cannot return expression of a formal incomplete type", N); | |
ec4867fa ES |
1081 | end if; |
1082 | ||
21d27997 RD |
1083 | -- If the result type is class-wide, then check that the return |
1084 | -- expression's type is not declared at a deeper level than the | |
1085 | -- function (RM05-6.5(5.6/2)). | |
1086 | ||
0791fbe9 | 1087 | if Ada_Version >= Ada_2005 |
21d27997 RD |
1088 | and then Is_Class_Wide_Type (R_Type) |
1089 | then | |
1090 | if Type_Access_Level (Etype (Expr)) > | |
1091 | Subprogram_Access_Level (Scope_Id) | |
1092 | then | |
1093 | Error_Msg_N | |
3ccedacc AC |
1094 | ("level of return expression type is deeper than " |
1095 | & "class-wide function!", Expr); | |
21d27997 RD |
1096 | end if; |
1097 | end if; | |
1098 | ||
4755cce9 JM |
1099 | -- Check incorrect use of dynamically tagged expression |
1100 | ||
1101 | if Is_Tagged_Type (R_Type) then | |
1102 | Check_Dynamically_Tagged_Expression | |
1103 | (Expr => Expr, | |
1104 | Typ => R_Type, | |
1105 | Related_Nod => N); | |
ec4867fa ES |
1106 | end if; |
1107 | ||
ec4867fa ES |
1108 | -- ??? A real run-time accessibility check is needed in cases |
1109 | -- involving dereferences of access parameters. For now we just | |
1110 | -- check the static cases. | |
1111 | ||
0791fbe9 | 1112 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
51245e2d | 1113 | and then Is_Limited_View (Etype (Scope_Id)) |
ec4867fa ES |
1114 | and then Object_Access_Level (Expr) > |
1115 | Subprogram_Access_Level (Scope_Id) | |
1116 | then | |
9694c039 AC |
1117 | -- Suppress the message in a generic, where the rewriting |
1118 | -- is irrelevant. | |
1119 | ||
1120 | if Inside_A_Generic then | |
1121 | null; | |
1122 | ||
1123 | else | |
1124 | Rewrite (N, | |
1125 | Make_Raise_Program_Error (Loc, | |
1126 | Reason => PE_Accessibility_Check_Failed)); | |
1127 | Analyze (N); | |
1128 | ||
43417b90 | 1129 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
1130 | Error_Msg_N ("cannot return a local value by reference<<", N); |
1131 | Error_Msg_NE ("\& [<<", N, Standard_Program_Error); | |
9694c039 | 1132 | end if; |
ec4867fa | 1133 | end if; |
5d37ba92 ES |
1134 | |
1135 | if Known_Null (Expr) | |
1136 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
1137 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
1138 | then | |
1139 | Apply_Compile_Time_Constraint_Error | |
1140 | (N => Expr, | |
1141 | Msg => "(Ada 2005) null not allowed for " | |
dbfeb4fa | 1142 | & "null-excluding return??", |
5d37ba92 ES |
1143 | Reason => CE_Null_Not_Allowed); |
1144 | end if; | |
445e5888 AC |
1145 | |
1146 | -- RM 6.5 (5.4/3): accessibility checks also apply if the return object | |
1147 | -- has no initializing expression. | |
1148 | ||
1149 | elsif Ada_Version > Ada_2005 and then Is_Class_Wide_Type (R_Type) then | |
1150 | if Type_Access_Level (Etype (Defining_Identifier (Obj_Decl))) > | |
1151 | Subprogram_Access_Level (Scope_Id) | |
1152 | then | |
1153 | Error_Msg_N | |
1154 | ("level of return expression type is deeper than " | |
1155 | & "class-wide function!", Obj_Decl); | |
1156 | end if; | |
ec4867fa ES |
1157 | end if; |
1158 | end Analyze_Function_Return; | |
1159 | ||
996ae0b0 RK |
1160 | ------------------------------------- |
1161 | -- Analyze_Generic_Subprogram_Body -- | |
1162 | ------------------------------------- | |
1163 | ||
1164 | procedure Analyze_Generic_Subprogram_Body | |
1165 | (N : Node_Id; | |
1166 | Gen_Id : Entity_Id) | |
1167 | is | |
fbf5a39b | 1168 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 1169 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 1170 | Body_Id : Entity_Id; |
996ae0b0 | 1171 | New_N : Node_Id; |
fbf5a39b | 1172 | Spec : Node_Id; |
996ae0b0 RK |
1173 | |
1174 | begin | |
82c80734 RD |
1175 | -- Copy body and disable expansion while analyzing the generic For a |
1176 | -- stub, do not copy the stub (which would load the proper body), this | |
1177 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
1178 | |
1179 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
1180 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
1181 | Rewrite (N, New_N); | |
1182 | Start_Generic; | |
1183 | end if; | |
1184 | ||
1185 | Spec := Specification (N); | |
1186 | ||
1187 | -- Within the body of the generic, the subprogram is callable, and | |
1188 | -- behaves like the corresponding non-generic unit. | |
1189 | ||
fbf5a39b | 1190 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
1191 | |
1192 | if Kind = E_Generic_Procedure | |
1193 | and then Nkind (Spec) /= N_Procedure_Specification | |
1194 | then | |
fbf5a39b | 1195 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
1196 | return; |
1197 | ||
1198 | elsif Kind = E_Generic_Function | |
1199 | and then Nkind (Spec) /= N_Function_Specification | |
1200 | then | |
fbf5a39b | 1201 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
1202 | return; |
1203 | end if; | |
1204 | ||
fbf5a39b | 1205 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
1206 | |
1207 | if Has_Completion (Gen_Id) | |
1208 | and then Nkind (Parent (N)) /= N_Subunit | |
1209 | then | |
1210 | Error_Msg_N ("duplicate generic body", N); | |
1211 | return; | |
1212 | else | |
1213 | Set_Has_Completion (Gen_Id); | |
1214 | end if; | |
1215 | ||
1216 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1217 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1218 | else | |
1219 | Set_Corresponding_Spec (N, Gen_Id); | |
1220 | end if; | |
1221 | ||
1222 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1223 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1224 | end if; | |
1225 | ||
1226 | -- Make generic parameters immediately visible in the body. They are | |
1227 | -- needed to process the formals declarations. Then make the formals | |
1228 | -- visible in a separate step. | |
1229 | ||
0a36105d | 1230 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1231 | |
1232 | declare | |
1233 | E : Entity_Id; | |
1234 | First_Ent : Entity_Id; | |
1235 | ||
1236 | begin | |
1237 | First_Ent := First_Entity (Gen_Id); | |
1238 | ||
1239 | E := First_Ent; | |
1240 | while Present (E) and then not Is_Formal (E) loop | |
1241 | Install_Entity (E); | |
1242 | Next_Entity (E); | |
1243 | end loop; | |
1244 | ||
1245 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1246 | ||
1247 | -- Now generic formals are visible, and the specification can be | |
1248 | -- analyzed, for subsequent conformance check. | |
1249 | ||
fbf5a39b | 1250 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1251 | |
fbf5a39b | 1252 | -- Make formal parameters visible |
996ae0b0 RK |
1253 | |
1254 | if Present (E) then | |
1255 | ||
fbf5a39b AC |
1256 | -- E is the first formal parameter, we loop through the formals |
1257 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1258 | |
1259 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1260 | while Present (E) loop |
1261 | Install_Entity (E); | |
1262 | Next_Formal (E); | |
1263 | end loop; | |
1264 | end if; | |
1265 | ||
e895b435 | 1266 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1267 | |
ec4867fa ES |
1268 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
1269 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
1270 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1271 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1272 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
c5cec2fe AC |
1273 | |
1274 | -- Inherit the "ghostness" of the generic spec. Note that this | |
1275 | -- property is not directly inherited as the body may be subject | |
1276 | -- to a different Ghost assertion policy. | |
1277 | ||
8636f52f | 1278 | if Is_Ghost_Entity (Gen_Id) or else Ghost_Mode > None then |
c5cec2fe AC |
1279 | Set_Is_Ghost_Entity (Body_Id); |
1280 | ||
1281 | -- The Ghost policy in effect at the point of declaration and at | |
3c756b76 | 1282 | -- the point of completion must match (SPARK RM 6.9(15)). |
c5cec2fe AC |
1283 | |
1284 | Check_Ghost_Completion (Gen_Id, Body_Id); | |
1285 | end if; | |
1286 | ||
fbf5a39b AC |
1287 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1288 | ||
1289 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1290 | ||
e895b435 | 1291 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1292 | |
1293 | Set_Ekind (Gen_Id, Kind); | |
1294 | Set_Ekind (Body_Id, Kind); | |
1295 | ||
1296 | if Present (First_Ent) then | |
1297 | Set_First_Entity (Gen_Id, First_Ent); | |
1298 | end if; | |
1299 | ||
1300 | End_Scope; | |
1301 | return; | |
1302 | end if; | |
996ae0b0 | 1303 | |
82c80734 RD |
1304 | -- If this is a compilation unit, it must be made visible explicitly, |
1305 | -- because the compilation of the declaration, unlike other library | |
1306 | -- unit declarations, does not. If it is not a unit, the following | |
1307 | -- is redundant but harmless. | |
996ae0b0 RK |
1308 | |
1309 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1310 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1311 | |
ec4867fa ES |
1312 | if Is_Child_Unit (Gen_Id) then |
1313 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1314 | end if; | |
1315 | ||
996ae0b0 | 1316 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 | 1317 | |
579847c2 AC |
1318 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
1319 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
1320 | ||
996ae0b0 RK |
1321 | Analyze_Declarations (Declarations (N)); |
1322 | Check_Completion; | |
1323 | Analyze (Handled_Statement_Sequence (N)); | |
1324 | ||
1325 | Save_Global_References (Original_Node (N)); | |
1326 | ||
82c80734 RD |
1327 | -- Prior to exiting the scope, include generic formals again (if any |
1328 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1329 | |
1330 | if Present (First_Ent) then | |
1331 | Set_First_Entity (Gen_Id, First_Ent); | |
1332 | end if; | |
1333 | ||
fbf5a39b | 1334 | Check_References (Gen_Id); |
996ae0b0 RK |
1335 | end; |
1336 | ||
e6f69614 | 1337 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1338 | End_Scope; |
1339 | Check_Subprogram_Order (N); | |
1340 | ||
e895b435 | 1341 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1342 | |
1343 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1344 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1345 | |
1346 | if Style_Check then | |
1347 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1348 | end if; | |
13d923cc | 1349 | |
996ae0b0 | 1350 | End_Generic; |
996ae0b0 RK |
1351 | end Analyze_Generic_Subprogram_Body; |
1352 | ||
4d8f3296 ES |
1353 | ---------------------------- |
1354 | -- Analyze_Null_Procedure -- | |
1355 | ---------------------------- | |
1356 | ||
1357 | procedure Analyze_Null_Procedure | |
1358 | (N : Node_Id; | |
1359 | Is_Completion : out Boolean) | |
1360 | is | |
1361 | Loc : constant Source_Ptr := Sloc (N); | |
1362 | Spec : constant Node_Id := Specification (N); | |
1363 | Designator : Entity_Id; | |
1364 | Form : Node_Id; | |
1365 | Null_Body : Node_Id := Empty; | |
1366 | Prev : Entity_Id; | |
1367 | ||
1368 | begin | |
1369 | -- Capture the profile of the null procedure before analysis, for | |
1370 | -- expansion at the freeze point and at each point of call. The body is | |
1371 | -- used if the procedure has preconditions, or if it is a completion. In | |
1372 | -- the first case the body is analyzed at the freeze point, in the other | |
1373 | -- it replaces the null procedure declaration. | |
1374 | ||
1375 | Null_Body := | |
1376 | Make_Subprogram_Body (Loc, | |
1377 | Specification => New_Copy_Tree (Spec), | |
8c35b40a | 1378 | Declarations => New_List, |
4d8f3296 ES |
1379 | Handled_Statement_Sequence => |
1380 | Make_Handled_Sequence_Of_Statements (Loc, | |
1381 | Statements => New_List (Make_Null_Statement (Loc)))); | |
1382 | ||
1383 | -- Create new entities for body and formals | |
1384 | ||
1385 | Set_Defining_Unit_Name (Specification (Null_Body), | |
9d2a2071 AC |
1386 | Make_Defining_Identifier |
1387 | (Sloc (Defining_Entity (N)), | |
1388 | Chars (Defining_Entity (N)))); | |
4d8f3296 ES |
1389 | |
1390 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1391 | while Present (Form) loop | |
1392 | Set_Defining_Identifier (Form, | |
9d2a2071 AC |
1393 | Make_Defining_Identifier |
1394 | (Sloc (Defining_Identifier (Form)), | |
1395 | Chars (Defining_Identifier (Form)))); | |
4d8f3296 ES |
1396 | Next (Form); |
1397 | end loop; | |
1398 | ||
1399 | -- Determine whether the null procedure may be a completion of a generic | |
1400 | -- suprogram, in which case we use the new null body as the completion | |
1401 | -- and set minimal semantic information on the original declaration, | |
1402 | -- which is rewritten as a null statement. | |
1403 | ||
1404 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
1405 | ||
1406 | if Present (Prev) and then Is_Generic_Subprogram (Prev) then | |
1407 | Insert_Before (N, Null_Body); | |
1408 | Set_Ekind (Defining_Entity (N), Ekind (Prev)); | |
4d8f3296 ES |
1409 | |
1410 | Rewrite (N, Make_Null_Statement (Loc)); | |
1411 | Analyze_Generic_Subprogram_Body (Null_Body, Prev); | |
1412 | Is_Completion := True; | |
1413 | return; | |
1414 | ||
1415 | else | |
4d8f3296 ES |
1416 | -- Resolve the types of the formals now, because the freeze point |
1417 | -- may appear in a different context, e.g. an instantiation. | |
1418 | ||
1419 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1420 | while Present (Form) loop | |
1421 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
1422 | Find_Type (Parameter_Type (Form)); | |
1423 | ||
1424 | elsif | |
1425 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
1426 | then | |
1427 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
1428 | ||
1429 | else | |
1430 | -- The case of a null procedure with a formal that is an | |
1431 | -- access_to_subprogram type, and that is used as an actual | |
1432 | -- in an instantiation is left to the enthusiastic reader. | |
1433 | ||
1434 | null; | |
1435 | end if; | |
1436 | ||
1437 | Next (Form); | |
1438 | end loop; | |
1439 | end if; | |
1440 | ||
1441 | -- If there are previous overloadable entities with the same name, | |
1442 | -- check whether any of them is completed by the null procedure. | |
1443 | ||
1444 | if Present (Prev) and then Is_Overloadable (Prev) then | |
1445 | Designator := Analyze_Subprogram_Specification (Spec); | |
1446 | Prev := Find_Corresponding_Spec (N); | |
1447 | end if; | |
1448 | ||
1449 | if No (Prev) or else not Comes_From_Source (Prev) then | |
1450 | Designator := Analyze_Subprogram_Specification (Spec); | |
1451 | Set_Has_Completion (Designator); | |
1452 | ||
1453 | -- Signal to caller that this is a procedure declaration | |
1454 | ||
1455 | Is_Completion := False; | |
1456 | ||
1457 | -- Null procedures are always inlined, but generic formal subprograms | |
1458 | -- which appear as such in the internal instance of formal packages, | |
1459 | -- need no completion and are not marked Inline. | |
1460 | ||
1461 | if Expander_Active | |
1462 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
1463 | then | |
1464 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
1465 | Set_Body_To_Inline (N, Null_Body); | |
1466 | Set_Is_Inlined (Designator); | |
1467 | end if; | |
1468 | ||
1469 | else | |
2fe258bf AC |
1470 | -- The null procedure is a completion. We unconditionally rewrite |
1471 | -- this as a null body (even if expansion is not active), because | |
1472 | -- there are various error checks that are applied on this body | |
1473 | -- when it is analyzed (e.g. correct aspect placement). | |
4d8f3296 | 1474 | |
a98480dd AC |
1475 | if Has_Completion (Prev) then |
1476 | Error_Msg_Sloc := Sloc (Prev); | |
1477 | Error_Msg_NE ("duplicate body for & declared#", N, Prev); | |
1478 | end if; | |
1479 | ||
4d8f3296 | 1480 | Is_Completion := True; |
2fe258bf AC |
1481 | Rewrite (N, Null_Body); |
1482 | Analyze (N); | |
4d8f3296 ES |
1483 | end if; |
1484 | end Analyze_Null_Procedure; | |
1485 | ||
996ae0b0 RK |
1486 | ----------------------------- |
1487 | -- Analyze_Operator_Symbol -- | |
1488 | ----------------------------- | |
1489 | ||
82c80734 RD |
1490 | -- An operator symbol such as "+" or "and" may appear in context where the |
1491 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1492 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1493 | -- generates this node, and the semantics does the disambiguation. Other | |
1494 | -- such case are actuals in an instantiation, the generic unit in an | |
1495 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1496 | |
1497 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1498 | Par : constant Node_Id := Parent (N); | |
1499 | ||
1500 | begin | |
1f0b1e48 | 1501 | if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
996ae0b0 | 1502 | or else Nkind (Par) = N_Function_Instantiation |
1f0b1e48 | 1503 | or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
996ae0b0 | 1504 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1f0b1e48 | 1505 | and then not Is_Pragma_String_Literal (Par)) |
996ae0b0 | 1506 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
800621e0 RD |
1507 | or else (Nkind (Par) = N_Attribute_Reference |
1508 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1509 | then |
1510 | Find_Direct_Name (N); | |
1511 | ||
1512 | else | |
1513 | Change_Operator_Symbol_To_String_Literal (N); | |
1514 | Analyze (N); | |
1515 | end if; | |
1516 | end Analyze_Operator_Symbol; | |
1517 | ||
1518 | ----------------------------------- | |
1519 | -- Analyze_Parameter_Association -- | |
1520 | ----------------------------------- | |
1521 | ||
1522 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1523 | begin | |
1524 | Analyze (Explicit_Actual_Parameter (N)); | |
1525 | end Analyze_Parameter_Association; | |
1526 | ||
1527 | ---------------------------- | |
1528 | -- Analyze_Procedure_Call -- | |
1529 | ---------------------------- | |
1530 | ||
1531 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
1532 | Loc : constant Source_Ptr := Sloc (N); | |
1533 | P : constant Node_Id := Name (N); | |
1534 | Actuals : constant List_Id := Parameter_Associations (N); | |
1535 | Actual : Node_Id; | |
1536 | New_N : Node_Id; | |
1537 | ||
1538 | procedure Analyze_Call_And_Resolve; | |
1539 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1540 | -- At end, check illegal order dependence. |
996ae0b0 | 1541 | |
fbf5a39b AC |
1542 | ------------------------------ |
1543 | -- Analyze_Call_And_Resolve -- | |
1544 | ------------------------------ | |
1545 | ||
996ae0b0 RK |
1546 | procedure Analyze_Call_And_Resolve is |
1547 | begin | |
1548 | if Nkind (N) = N_Procedure_Call_Statement then | |
1549 | Analyze_Call (N); | |
1550 | Resolve (N, Standard_Void_Type); | |
1551 | else | |
1552 | Analyze (N); | |
1553 | end if; | |
1554 | end Analyze_Call_And_Resolve; | |
1555 | ||
1556 | -- Start of processing for Analyze_Procedure_Call | |
1557 | ||
1558 | begin | |
1559 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1560 | -- a procedure call or an entry call. The prefix may denote an access | |
1561 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1562 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1563 | -- then the construct denotes a call to a member of an entire family. |
1564 | -- If the prefix is a simple name, it may still denote a call to a | |
1565 | -- parameterless member of an entry family. Resolution of these various | |
1566 | -- interpretations is delicate. | |
1567 | ||
1568 | Analyze (P); | |
1569 | ||
758c442c GD |
1570 | -- If this is a call of the form Obj.Op, the call may have been |
1571 | -- analyzed and possibly rewritten into a block, in which case | |
1572 | -- we are done. | |
1573 | ||
1574 | if Analyzed (N) then | |
1575 | return; | |
1576 | end if; | |
1577 | ||
7415029d AC |
1578 | -- If there is an error analyzing the name (which may have been |
1579 | -- rewritten if the original call was in prefix notation) then error | |
1580 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1581 | |
21791d97 | 1582 | if Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
996ae0b0 RK |
1583 | Set_Etype (N, Any_Type); |
1584 | return; | |
1585 | end if; | |
1586 | ||
8636f52f HK |
1587 | -- The name of the procedure call may reference an entity subject to |
1588 | -- pragma Ghost with policy Ignore. Set the mode now to ensure that any | |
1589 | -- nodes generated during analysis and expansion are properly flagged as | |
1590 | -- ignored Ghost. | |
1591 | ||
1592 | Set_Ghost_Mode (N); | |
1593 | ||
996ae0b0 RK |
1594 | -- Otherwise analyze the parameters |
1595 | ||
1596 | if Present (Actuals) then | |
1597 | Actual := First (Actuals); | |
1598 | ||
1599 | while Present (Actual) loop | |
1600 | Analyze (Actual); | |
1601 | Check_Parameterless_Call (Actual); | |
1602 | Next (Actual); | |
1603 | end loop; | |
1604 | end if; | |
1605 | ||
0bfc9a64 | 1606 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1607 | |
1608 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a AC |
1609 | and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
1610 | Name_Elab_Body, | |
1611 | Name_Elab_Subp_Body) | |
996ae0b0 RK |
1612 | then |
1613 | if Present (Actuals) then | |
1614 | Error_Msg_N | |
1615 | ("no parameters allowed for this call", First (Actuals)); | |
1616 | return; | |
1617 | end if; | |
1618 | ||
1619 | Set_Etype (N, Standard_Void_Type); | |
1620 | Set_Analyzed (N); | |
1621 | ||
1622 | elsif Is_Entity_Name (P) | |
1623 | and then Is_Record_Type (Etype (Entity (P))) | |
1624 | and then Remote_AST_I_Dereference (P) | |
1625 | then | |
1626 | return; | |
1627 | ||
1628 | elsif Is_Entity_Name (P) | |
1629 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1630 | then | |
1631 | if Is_Access_Type (Etype (P)) | |
1632 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1633 | and then No (Actuals) | |
1634 | and then Comes_From_Source (N) | |
1635 | then | |
ed2233dc | 1636 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1637 | end if; |
1638 | ||
1639 | Analyze_Call_And_Resolve; | |
1640 | ||
1641 | -- If the prefix is the simple name of an entry family, this is | |
1642 | -- a parameterless call from within the task body itself. | |
1643 | ||
1644 | elsif Is_Entity_Name (P) | |
1645 | and then Nkind (P) = N_Identifier | |
1646 | and then Ekind (Entity (P)) = E_Entry_Family | |
1647 | and then Present (Actuals) | |
1648 | and then No (Next (First (Actuals))) | |
1649 | then | |
82c80734 RD |
1650 | -- Can be call to parameterless entry family. What appears to be the |
1651 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1652 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1653 | -- transformation. |
1654 | ||
1655 | New_N := | |
1656 | Make_Indexed_Component (Loc, | |
1657 | Prefix => | |
1658 | Make_Selected_Component (Loc, | |
1659 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1660 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1661 | Expressions => Actuals); | |
1662 | Set_Name (N, New_N); | |
1663 | Set_Etype (New_N, Standard_Void_Type); | |
1664 | Set_Parameter_Associations (N, No_List); | |
1665 | Analyze_Call_And_Resolve; | |
1666 | ||
1667 | elsif Nkind (P) = N_Explicit_Dereference then | |
1668 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1669 | Analyze_Call_And_Resolve; | |
1670 | else | |
1671 | Error_Msg_N ("expect access to procedure in call", P); | |
1672 | end if; | |
1673 | ||
82c80734 RD |
1674 | -- The name can be a selected component or an indexed component that |
1675 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1676 | -- has parameter associations. | |
996ae0b0 RK |
1677 | |
1678 | elsif Is_Access_Type (Etype (P)) | |
1679 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1680 | then | |
1681 | if Present (Actuals) then | |
1682 | Analyze_Call_And_Resolve; | |
1683 | else | |
ed2233dc | 1684 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1685 | end if; |
1686 | ||
82c80734 RD |
1687 | -- If not an access to subprogram, then the prefix must resolve to the |
1688 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1689 | |
82c80734 RD |
1690 | -- For the case of a simple entry call, P is a selected component where |
1691 | -- the prefix is the task and the selector name is the entry. A call to | |
1692 | -- a protected procedure will have the same syntax. If the protected | |
1693 | -- object contains overloaded operations, the entity may appear as a | |
1694 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1695 | |
1696 | elsif Nkind (P) = N_Selected_Component | |
8fde064e AC |
1697 | and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
1698 | E_Procedure, | |
1699 | E_Function) | |
996ae0b0 RK |
1700 | then |
1701 | Analyze_Call_And_Resolve; | |
1702 | ||
1703 | elsif Nkind (P) = N_Selected_Component | |
1704 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1705 | and then Present (Actuals) | |
1706 | and then No (Next (First (Actuals))) | |
1707 | then | |
82c80734 RD |
1708 | -- Can be call to parameterless entry family. What appears to be the |
1709 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1710 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1711 | -- transformation. |
1712 | ||
1713 | New_N := | |
1714 | Make_Indexed_Component (Loc, | |
1715 | Prefix => New_Copy (P), | |
1716 | Expressions => Actuals); | |
1717 | Set_Name (N, New_N); | |
1718 | Set_Etype (New_N, Standard_Void_Type); | |
1719 | Set_Parameter_Associations (N, No_List); | |
1720 | Analyze_Call_And_Resolve; | |
1721 | ||
1722 | -- For the case of a reference to an element of an entry family, P is | |
1723 | -- an indexed component whose prefix is a selected component (task and | |
1724 | -- entry family), and whose index is the entry family index. | |
1725 | ||
1726 | elsif Nkind (P) = N_Indexed_Component | |
1727 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1728 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1729 | then | |
1730 | Analyze_Call_And_Resolve; | |
1731 | ||
1732 | -- If the prefix is the name of an entry family, it is a call from | |
1733 | -- within the task body itself. | |
1734 | ||
1735 | elsif Nkind (P) = N_Indexed_Component | |
1736 | and then Nkind (Prefix (P)) = N_Identifier | |
1737 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1738 | then | |
1739 | New_N := | |
1740 | Make_Selected_Component (Loc, | |
1741 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1742 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1743 | Rewrite (Prefix (P), New_N); | |
1744 | Analyze (P); | |
1745 | Analyze_Call_And_Resolve; | |
1746 | ||
9f8d1e5c AC |
1747 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
1748 | -- procedure name, so the construct can only be a qualified expression. | |
1749 | ||
1750 | elsif Nkind (P) = N_Qualified_Expression | |
1751 | and then Ada_Version >= Ada_2012 | |
1752 | then | |
1753 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
1754 | Analyze (N); | |
1755 | ||
e895b435 | 1756 | -- Anything else is an error |
996ae0b0 RK |
1757 | |
1758 | else | |
758c442c | 1759 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 RK |
1760 | end if; |
1761 | end Analyze_Procedure_Call; | |
1762 | ||
b0186f71 AC |
1763 | ------------------------------ |
1764 | -- Analyze_Return_Statement -- | |
1765 | ------------------------------ | |
1766 | ||
1767 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1768 | ||
1769 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1770 | N_Extended_Return_Statement)); | |
1771 | ||
1772 | Returns_Object : constant Boolean := | |
1773 | Nkind (N) = N_Extended_Return_Statement | |
1774 | or else | |
8fde064e AC |
1775 | (Nkind (N) = N_Simple_Return_Statement |
1776 | and then Present (Expression (N))); | |
b0186f71 AC |
1777 | -- True if we're returning something; that is, "return <expression>;" |
1778 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1779 | -- checking: If Returns_Object is True, N should apply to a function | |
1780 | -- body; otherwise N should apply to a procedure body, entry body, | |
1781 | -- accept statement, or extended return statement. | |
1782 | ||
1783 | function Find_What_It_Applies_To return Entity_Id; | |
1784 | -- Find the entity representing the innermost enclosing body, accept | |
1785 | -- statement, or extended return statement. If the result is a callable | |
1786 | -- construct or extended return statement, then this will be the value | |
1787 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1788 | -- illegal. See RM-6.5(4/2). | |
1789 | ||
1790 | ----------------------------- | |
1791 | -- Find_What_It_Applies_To -- | |
1792 | ----------------------------- | |
1793 | ||
1794 | function Find_What_It_Applies_To return Entity_Id is | |
1795 | Result : Entity_Id := Empty; | |
1796 | ||
1797 | begin | |
36b8f95f AC |
1798 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1799 | -- and postconditions. | |
b0186f71 AC |
1800 | |
1801 | for J in reverse 0 .. Scope_Stack.Last loop | |
1802 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1803 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1804 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1805 | end loop; |
1806 | ||
1807 | pragma Assert (Present (Result)); | |
1808 | return Result; | |
1809 | end Find_What_It_Applies_To; | |
1810 | ||
1811 | -- Local declarations | |
1812 | ||
1813 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1814 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1815 | Loc : constant Source_Ptr := Sloc (N); | |
1816 | Stm_Entity : constant Entity_Id := | |
1817 | New_Internal_Entity | |
1818 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1819 | ||
1820 | -- Start of processing for Analyze_Return_Statement | |
1821 | ||
1822 | begin | |
1823 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1824 | ||
1825 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1826 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1827 | ||
1828 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1829 | -- (4/2): an inner return statement will apply to this extended return. | |
1830 | ||
1831 | if Nkind (N) = N_Extended_Return_Statement then | |
1832 | Push_Scope (Stm_Entity); | |
1833 | end if; | |
1834 | ||
1835 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1836 | -- implicitly-generated return that is placed at the end. | |
1837 | ||
1838 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1839 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1840 | end if; | |
1841 | ||
1842 | -- Warn on any unassigned OUT parameters if in procedure | |
1843 | ||
1844 | if Ekind (Scope_Id) = E_Procedure then | |
1845 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1846 | end if; | |
1847 | ||
1848 | -- Check that functions return objects, and other things do not | |
1849 | ||
1850 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1851 | if not Returns_Object then | |
1852 | Error_Msg_N ("missing expression in return from function", N); | |
1853 | end if; | |
1854 | ||
1855 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1856 | if Returns_Object then | |
1857 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1858 | end if; | |
1859 | ||
1860 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1861 | if Returns_Object then | |
1862 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1863 | Error_Msg_N ("entry body cannot return value", N); | |
1864 | else | |
1865 | Error_Msg_N ("accept statement cannot return value", N); | |
1866 | end if; | |
1867 | end if; | |
1868 | ||
1869 | elsif Kind = E_Return_Statement then | |
1870 | ||
1871 | -- We are nested within another return statement, which must be an | |
1872 | -- extended_return_statement. | |
1873 | ||
1874 | if Returns_Object then | |
d0dcb2b1 AC |
1875 | if Nkind (N) = N_Extended_Return_Statement then |
1876 | Error_Msg_N | |
cc96a1b8 | 1877 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
1878 | N); |
1879 | ||
1880 | -- Case of a simple return statement with a value inside extended | |
1881 | -- return statement. | |
1882 | ||
1883 | else | |
1884 | Error_Msg_N | |
3ccedacc AC |
1885 | ("return nested in extended return statement cannot return " |
1886 | & "value (use `RETURN;`)", N); | |
d0dcb2b1 | 1887 | end if; |
b0186f71 AC |
1888 | end if; |
1889 | ||
1890 | else | |
1891 | Error_Msg_N ("illegal context for return statement", N); | |
1892 | end if; | |
1893 | ||
1894 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1895 | Analyze_Function_Return (N); | |
1896 | ||
1897 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1898 | Set_Return_Present (Scope_Id); | |
1899 | end if; | |
1900 | ||
1901 | if Nkind (N) = N_Extended_Return_Statement then | |
1902 | End_Scope; | |
1903 | end if; | |
1904 | ||
1905 | Kill_Current_Values (Last_Assignment_Only => True); | |
1906 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
1907 | |
1908 | Analyze_Dimension (N); | |
b0186f71 AC |
1909 | end Analyze_Return_Statement; |
1910 | ||
5d37ba92 ES |
1911 | ------------------------------------- |
1912 | -- Analyze_Simple_Return_Statement -- | |
1913 | ------------------------------------- | |
ec4867fa | 1914 | |
5d37ba92 | 1915 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1916 | begin |
5d37ba92 ES |
1917 | if Present (Expression (N)) then |
1918 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1919 | end if; |
1920 | ||
5d37ba92 ES |
1921 | Analyze_Return_Statement (N); |
1922 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1923 | |
82c80734 RD |
1924 | ------------------------- |
1925 | -- Analyze_Return_Type -- | |
1926 | ------------------------- | |
1927 | ||
1928 | procedure Analyze_Return_Type (N : Node_Id) is | |
1929 | Designator : constant Entity_Id := Defining_Entity (N); | |
1930 | Typ : Entity_Id := Empty; | |
1931 | ||
1932 | begin | |
ec4867fa ES |
1933 | -- Normal case where result definition does not indicate an error |
1934 | ||
41251c60 JM |
1935 | if Result_Definition (N) /= Error then |
1936 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
ce5ba43a | 1937 | Check_SPARK_05_Restriction |
fe5d3068 | 1938 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1939 | |
b1c11e0e JM |
1940 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1941 | ||
1942 | declare | |
1943 | AD : constant Node_Id := | |
1944 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1945 | begin | |
1946 | if Present (AD) and then Protected_Present (AD) then | |
1947 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1948 | else | |
1949 | Typ := Access_Definition (N, Result_Definition (N)); | |
1950 | end if; | |
1951 | end; | |
1952 | ||
41251c60 JM |
1953 | Set_Parent (Typ, Result_Definition (N)); |
1954 | Set_Is_Local_Anonymous_Access (Typ); | |
1955 | Set_Etype (Designator, Typ); | |
1956 | ||
b66c3ff4 AC |
1957 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1958 | ||
1959 | Null_Exclusion_Static_Checks (N); | |
1960 | ||
41251c60 JM |
1961 | -- Subtype_Mark case |
1962 | ||
1963 | else | |
1964 | Find_Type (Result_Definition (N)); | |
1965 | Typ := Entity (Result_Definition (N)); | |
1966 | Set_Etype (Designator, Typ); | |
1967 | ||
2ba431e5 | 1968 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1969 | |
8fde064e | 1970 | if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
ce5ba43a | 1971 | Check_SPARK_05_Restriction |
fe5d3068 | 1972 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1973 | Result_Definition (N)); |
daec8eeb YM |
1974 | end if; |
1975 | ||
b66c3ff4 AC |
1976 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1977 | ||
1978 | Null_Exclusion_Static_Checks (N); | |
1979 | ||
1980 | -- If a null exclusion is imposed on the result type, then create | |
1981 | -- a null-excluding itype (an access subtype) and use it as the | |
1982 | -- function's Etype. Note that the null exclusion checks are done | |
1983 | -- right before this, because they don't get applied to types that | |
1984 | -- do not come from source. | |
1985 | ||
8fde064e | 1986 | if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
b66c3ff4 AC |
1987 | Set_Etype (Designator, |
1988 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
1989 | (T => Typ, |
1990 | Related_Nod => N, | |
1991 | Scope_Id => Scope (Current_Scope))); | |
1992 | ||
1993 | -- The new subtype must be elaborated before use because | |
1994 | -- it is visible outside of the function. However its base | |
1995 | -- type may not be frozen yet, so the reference that will | |
1996 | -- force elaboration must be attached to the freezing of | |
1997 | -- the base type. | |
1998 | ||
212863c0 AC |
1999 | -- If the return specification appears on a proper body, |
2000 | -- the subtype will have been created already on the spec. | |
2001 | ||
ff7139c3 | 2002 | if Is_Frozen (Typ) then |
212863c0 AC |
2003 | if Nkind (Parent (N)) = N_Subprogram_Body |
2004 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
2005 | then | |
2006 | null; | |
2007 | else | |
2008 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
2009 | end if; | |
2010 | ||
ff7139c3 AC |
2011 | else |
2012 | Ensure_Freeze_Node (Typ); | |
2013 | ||
2014 | declare | |
212863c0 | 2015 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
2016 | begin |
2017 | Set_Itype (IR, Etype (Designator)); | |
2018 | Append_Freeze_Actions (Typ, New_List (IR)); | |
2019 | end; | |
2020 | end if; | |
2021 | ||
b66c3ff4 AC |
2022 | else |
2023 | Set_Etype (Designator, Typ); | |
2024 | end if; | |
2025 | ||
41251c60 | 2026 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
2027 | and then Is_Value_Type (Typ) |
2028 | then | |
2029 | null; | |
2030 | ||
2031 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 | 2032 | or else (Is_Class_Wide_Type (Typ) |
4b6f99f5 | 2033 | and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
41251c60 | 2034 | then |
dd386db0 AC |
2035 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
2036 | -- parts. Untagged incomplete types are not allowed in bodies. | |
b973629e AC |
2037 | -- As a consequence, limited views cannot appear in a basic |
2038 | -- declaration that is itself within a body, because there is | |
2039 | -- no point at which the non-limited view will become visible. | |
dd386db0 AC |
2040 | |
2041 | if Ada_Version >= Ada_2012 then | |
b973629e AC |
2042 | if From_Limited_With (Typ) and then In_Package_Body then |
2043 | Error_Msg_NE | |
2044 | ("invalid use of incomplete type&", | |
3f80a182 | 2045 | Result_Definition (N), Typ); |
b973629e | 2046 | |
1ebc2612 AC |
2047 | -- The return type of a subprogram body cannot be of a |
2048 | -- formal incomplete type. | |
2049 | ||
2050 | elsif Is_Generic_Type (Typ) | |
2051 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2052 | then | |
2053 | Error_Msg_N | |
2054 | ("return type cannot be a formal incomplete type", | |
2055 | Result_Definition (N)); | |
2056 | ||
2057 | elsif Is_Class_Wide_Type (Typ) | |
2058 | and then Is_Generic_Type (Root_Type (Typ)) | |
2059 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2060 | then | |
2061 | Error_Msg_N | |
2062 | ("return type cannot be a formal incomplete type", | |
2063 | Result_Definition (N)); | |
2064 | ||
b973629e | 2065 | elsif Is_Tagged_Type (Typ) then |
dd386db0 AC |
2066 | null; |
2067 | ||
ed09416f AC |
2068 | -- Use is legal in a thunk generated for an operation |
2069 | -- inherited from a progenitor. | |
2070 | ||
2071 | elsif Is_Thunk (Designator) | |
2072 | and then Present (Non_Limited_View (Typ)) | |
2073 | then | |
2074 | null; | |
2075 | ||
5b6f12c7 | 2076 | elsif Nkind (Parent (N)) = N_Subprogram_Body |
31d922e3 AC |
2077 | or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
2078 | N_Entry_Body) | |
dd386db0 AC |
2079 | then |
2080 | Error_Msg_NE | |
2081 | ("invalid use of untagged incomplete type&", | |
2082 | Designator, Typ); | |
2083 | end if; | |
2084 | ||
63be2a5a | 2085 | -- The type must be completed in the current package. This |
31d922e3 | 2086 | -- is checked at the end of the package declaration when |
7b7a0c2b AC |
2087 | -- Taft-amendment types are identified. If the return type |
2088 | -- is class-wide, there is no required check, the type can | |
2089 | -- be a bona fide TAT. | |
63be2a5a AC |
2090 | |
2091 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 2092 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 2093 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
2094 | then |
2095 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
2096 | end if; | |
2097 | ||
dd386db0 AC |
2098 | else |
2099 | Error_Msg_NE | |
2100 | ("invalid use of incomplete type&", Designator, Typ); | |
2101 | end if; | |
41251c60 | 2102 | end if; |
82c80734 RD |
2103 | end if; |
2104 | ||
ec4867fa ES |
2105 | -- Case where result definition does indicate an error |
2106 | ||
82c80734 RD |
2107 | else |
2108 | Set_Etype (Designator, Any_Type); | |
2109 | end if; | |
2110 | end Analyze_Return_Type; | |
2111 | ||
996ae0b0 RK |
2112 | ----------------------------- |
2113 | -- Analyze_Subprogram_Body -- | |
2114 | ----------------------------- | |
2115 | ||
b1b543d2 BD |
2116 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
2117 | Loc : constant Source_Ptr := Sloc (N); | |
2118 | Body_Spec : constant Node_Id := Specification (N); | |
2119 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
2120 | ||
2121 | begin | |
2122 | if Debug_Flag_C then | |
2123 | Write_Str ("==> subprogram body "); | |
2124 | Write_Name (Chars (Body_Id)); | |
2125 | Write_Str (" from "); | |
2126 | Write_Location (Loc); | |
2127 | Write_Eol; | |
2128 | Indent; | |
2129 | end if; | |
2130 | ||
2131 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
2132 | ||
2133 | -- The real work is split out into the helper, so it can do "return;" | |
2134 | -- without skipping the debug output: | |
2135 | ||
2136 | Analyze_Subprogram_Body_Helper (N); | |
2137 | ||
2138 | if Debug_Flag_C then | |
2139 | Outdent; | |
2140 | Write_Str ("<== subprogram body "); | |
2141 | Write_Name (Chars (Body_Id)); | |
2142 | Write_Str (" from "); | |
2143 | Write_Location (Loc); | |
2144 | Write_Eol; | |
2145 | end if; | |
2146 | end Analyze_Subprogram_Body; | |
2147 | ||
ea3c0651 AC |
2148 | -------------------------------------- |
2149 | -- Analyze_Subprogram_Body_Contract -- | |
2150 | -------------------------------------- | |
2151 | ||
ab8843fa | 2152 | procedure Analyze_Subprogram_Body_Contract (Body_Id : Entity_Id) is |
c9d70ab1 | 2153 | Body_Decl : constant Node_Id := Unit_Declaration_Node (Body_Id); |
ea3c0651 | 2154 | |
c9d70ab1 AC |
2155 | procedure Analyze_Completion_Contract (Spec_Id : Entity_Id); |
2156 | -- Analyze all delayed pragmas chained on the contract of subprogram | |
2157 | -- body Body_Id as if they appeared at the end of a declarative region. | |
2158 | -- Spec_Id denotes the corresponding spec. The aspects in question are: | |
2159 | -- Refined_Depends | |
2160 | -- Refined_Global | |
2161 | -- Note that pragma Refined_Post is analyzed immediately | |
fc999c5d | 2162 | |
c9d70ab1 AC |
2163 | --------------------------------- |
2164 | -- Analyze_Completion_Contract -- | |
2165 | --------------------------------- | |
c61ef416 | 2166 | |
c9d70ab1 AC |
2167 | procedure Analyze_Completion_Contract (Spec_Id : Entity_Id) is |
2168 | Items : constant Node_Id := Contract (Body_Id); | |
2169 | Prag : Node_Id; | |
2170 | Prag_Nam : Name_Id; | |
2171 | Ref_Depends : Node_Id := Empty; | |
2172 | Ref_Global : Node_Id := Empty; | |
ab8843fa | 2173 | |
c9d70ab1 AC |
2174 | begin |
2175 | -- All subprograms carry a contract, but for some it is not | |
2176 | -- significant and should not be processed. | |
ab8843fa | 2177 | |
c9d70ab1 AC |
2178 | if not Has_Significant_Contract (Spec_Id) then |
2179 | return; | |
2180 | ||
2181 | elsif Present (Items) then | |
2182 | ||
2183 | -- Locate and store pragmas Refined_Depends and Refined_Global | |
2184 | -- since their order of analysis matters. | |
2c8d828a | 2185 | |
c9d70ab1 AC |
2186 | Prag := Classifications (Items); |
2187 | while Present (Prag) loop | |
2188 | Prag_Nam := Pragma_Name (Prag); | |
54e28df2 | 2189 | |
c9d70ab1 AC |
2190 | if Prag_Nam = Name_Refined_Depends then |
2191 | Ref_Depends := Prag; | |
2192 | ||
2193 | elsif Prag_Nam = Name_Refined_Global then | |
2194 | Ref_Global := Prag; | |
2195 | end if; | |
2196 | ||
2197 | Prag := Next_Pragma (Prag); | |
2198 | end loop; | |
ab8843fa HK |
2199 | end if; |
2200 | ||
c9d70ab1 AC |
2201 | -- Analyze Refined_Global first as Refined_Depends may mention items |
2202 | -- classified in the global refinement. | |
ab8843fa | 2203 | |
c9d70ab1 AC |
2204 | if Present (Ref_Global) then |
2205 | Analyze_Refined_Global_In_Decl_Part (Ref_Global); | |
c9d70ab1 | 2206 | end if; |
ab8843fa | 2207 | |
c9d70ab1 AC |
2208 | -- Refined_Depends must be analyzed after Refined_Global in order to |
2209 | -- see the modes of all global refinements. | |
2210 | ||
2211 | if Present (Ref_Depends) then | |
2212 | Analyze_Refined_Depends_In_Decl_Part (Ref_Depends); | |
ab8843fa | 2213 | end if; |
c9d70ab1 AC |
2214 | end Analyze_Completion_Contract; |
2215 | ||
2216 | -- Local variables | |
2217 | ||
2218 | Mode : SPARK_Mode_Type; | |
2219 | Spec_Id : Entity_Id; | |
2220 | ||
2221 | -- Start of processing for Analyze_Subprogram_Body_Contract | |
2222 | ||
2223 | begin | |
2224 | -- When a subprogram body declaration is illegal, its defining entity is | |
2225 | -- left unanalyzed. There is nothing left to do in this case because the | |
2226 | -- body lacks a contract, or even a proper Ekind. | |
2227 | ||
2228 | if Ekind (Body_Id) = E_Void then | |
2229 | return; | |
ab8843fa | 2230 | end if; |
54e28df2 | 2231 | |
c9d70ab1 AC |
2232 | -- Due to the timing of contract analysis, delayed pragmas may be |
2233 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
2234 | -- context. To remedy this, restore the original SPARK_Mode of the | |
2235 | -- related subprogram body. | |
54e28df2 | 2236 | |
c9d70ab1 | 2237 | Save_SPARK_Mode_And_Set (Body_Id, Mode); |
39d3009f | 2238 | |
c9d70ab1 AC |
2239 | if Nkind (Body_Decl) = N_Subprogram_Body_Stub then |
2240 | Spec_Id := Corresponding_Spec_Of_Stub (Body_Decl); | |
2241 | else | |
2242 | Spec_Id := Corresponding_Spec (Body_Decl); | |
2243 | end if; | |
39d3009f | 2244 | |
c9d70ab1 AC |
2245 | -- The subprogram body is a completion, analyze all delayed pragmas that |
2246 | -- apply. Note that when the body is stand alone, the pragmas are always | |
2247 | -- analyzed on the spot. | |
39d3009f | 2248 | |
c9d70ab1 AC |
2249 | if Present (Spec_Id) then |
2250 | Analyze_Completion_Contract (Spec_Id); | |
54e28df2 | 2251 | end if; |
c61ef416 | 2252 | |
c9d70ab1 AC |
2253 | -- Ensure that the contract cases or postconditions mention 'Result or |
2254 | -- define a post-state. | |
2255 | ||
2256 | Check_Result_And_Post_State (Body_Id); | |
2257 | ||
fc999c5d RD |
2258 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
2259 | -- pragmas have been analyzed. | |
2260 | ||
c61ef416 | 2261 | Restore_SPARK_Mode (Mode); |
ea3c0651 AC |
2262 | end Analyze_Subprogram_Body_Contract; |
2263 | ||
b1b543d2 BD |
2264 | ------------------------------------ |
2265 | -- Analyze_Subprogram_Body_Helper -- | |
2266 | ------------------------------------ | |
2267 | ||
996ae0b0 RK |
2268 | -- This procedure is called for regular subprogram bodies, generic bodies, |
2269 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
2270 | -- specification matters, and is used to create a proper declaration for | |
2271 | -- the subprogram, or to perform conformance checks. | |
2272 | ||
b1b543d2 | 2273 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b AC |
2274 | Loc : constant Source_Ptr := Sloc (N); |
2275 | Body_Spec : constant Node_Id := Specification (N); | |
2276 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
2277 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 2278 | Conformant : Boolean; |
21d27997 | 2279 | HSS : Node_Id; |
21d27997 RD |
2280 | Prot_Typ : Entity_Id := Empty; |
2281 | Spec_Id : Entity_Id; | |
2282 | Spec_Decl : Node_Id := Empty; | |
2283 | ||
2284 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
2285 | -- When we analyze a separate spec, the entity chain ends up containing | |
2286 | -- the formals, as well as any itypes generated during analysis of the | |
2287 | -- default expressions for parameters, or the arguments of associated | |
2288 | -- precondition/postcondition pragmas (which are analyzed in the context | |
2289 | -- of the spec since they have visibility on formals). | |
2290 | -- | |
2291 | -- These entities belong with the spec and not the body. However we do | |
2292 | -- the analysis of the body in the context of the spec (again to obtain | |
2293 | -- visibility to the formals), and all the entities generated during | |
2294 | -- this analysis end up also chained to the entity chain of the spec. | |
2295 | -- But they really belong to the body, and there is circuitry to move | |
2296 | -- them from the spec to the body. | |
2297 | -- | |
2298 | -- However, when we do this move, we don't want to move the real spec | |
2299 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
2300 | -- variable points to the last real spec entity, so we only move those | |
2301 | -- chained beyond that point. It is initialized to Empty to deal with | |
2302 | -- the case where there is no separate spec. | |
996ae0b0 | 2303 | |
c8a3028c AC |
2304 | procedure Analyze_Aspects_On_Body_Or_Stub; |
2305 | -- Analyze the aspect specifications of a subprogram body [stub]. It is | |
2306 | -- assumed that N has aspects. | |
2307 | ||
ac072cb2 AC |
2308 | function Body_Has_Contract return Boolean; |
2309 | -- Check whether unanalyzed body has an aspect or pragma that may | |
1399d355 | 2310 | -- generate a SPARK contract. |
ac072cb2 | 2311 | |
ec4867fa | 2312 | procedure Check_Anonymous_Return; |
e50e1c5e | 2313 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
2314 | -- or a type that contains tasks, we must create a master entity for |
2315 | -- the anonymous type, which typically will be used in an allocator | |
2316 | -- in the body of the function. | |
2317 | ||
e660dbf7 JM |
2318 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
2319 | -- Look ahead to recognize a pragma that may appear after the body. | |
2320 | -- If there is a previous spec, check that it appears in the same | |
2321 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
2322 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
2323 | -- If the body acts as a spec, and inlining is required, we create a | |
2324 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
2325 | -- If pragma does not appear after the body, check whether there is |
2326 | -- an inline pragma before any local declarations. | |
c37bb106 | 2327 | |
7665e4bd AC |
2328 | procedure Check_Missing_Return; |
2329 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
2330 | -- the warning checks implemented by Check_Returns. In formal mode, also |
2331 | -- verify that a function ends with a RETURN and that a procedure does | |
2332 | -- not contain any RETURN. | |
7665e4bd | 2333 | |
d44202ba HK |
2334 | function Disambiguate_Spec return Entity_Id; |
2335 | -- When a primitive is declared between the private view and the full | |
2336 | -- view of a concurrent type which implements an interface, a special | |
2337 | -- mechanism is used to find the corresponding spec of the primitive | |
2338 | -- body. | |
2339 | ||
5dcab3ca AC |
2340 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id); |
2341 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains | |
2342 | -- incomplete types coming from a limited context and swap their limited | |
2343 | -- views with the non-limited ones. | |
2344 | ||
d44202ba HK |
2345 | function Is_Private_Concurrent_Primitive |
2346 | (Subp_Id : Entity_Id) return Boolean; | |
2347 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
2348 | -- type that implements an interface and has a private view. | |
2349 | ||
76a69663 ES |
2350 | procedure Set_Trivial_Subprogram (N : Node_Id); |
2351 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
2352 | -- subprogram whose body is being analyzed. N is the statement node | |
2353 | -- causing the flag to be set, if the following statement is a return | |
2354 | -- of an entity, we mark the entity as set in source to suppress any | |
2355 | -- warning on the stylized use of function stubs with a dummy return. | |
2356 | ||
758c442c GD |
2357 | procedure Verify_Overriding_Indicator; |
2358 | -- If there was a previous spec, the entity has been entered in the | |
2359 | -- current scope previously. If the body itself carries an overriding | |
2360 | -- indicator, check that it is consistent with the known status of the | |
2361 | -- entity. | |
2362 | ||
c8a3028c AC |
2363 | ------------------------------------- |
2364 | -- Analyze_Aspects_On_Body_Or_Stub -- | |
2365 | ------------------------------------- | |
2366 | ||
2367 | procedure Analyze_Aspects_On_Body_Or_Stub is | |
2368 | procedure Diagnose_Misplaced_Aspects; | |
2369 | -- Subprogram body [stub] N has aspects, but they are not properly | |
2370 | -- placed. Provide precise diagnostics depending on the aspects | |
2371 | -- involved. | |
2372 | ||
2373 | -------------------------------- | |
2374 | -- Diagnose_Misplaced_Aspects -- | |
2375 | -------------------------------- | |
2376 | ||
2377 | procedure Diagnose_Misplaced_Aspects is | |
2378 | Asp : Node_Id; | |
2379 | Asp_Nam : Name_Id; | |
2380 | Asp_Id : Aspect_Id; | |
2381 | -- The current aspect along with its name and id | |
2382 | ||
2383 | procedure SPARK_Aspect_Error (Ref_Nam : Name_Id); | |
2384 | -- Emit an error message concerning SPARK aspect Asp. Ref_Nam is | |
2385 | -- the name of the refined version of the aspect. | |
2386 | ||
2387 | ------------------------ | |
2388 | -- SPARK_Aspect_Error -- | |
2389 | ------------------------ | |
2390 | ||
2391 | procedure SPARK_Aspect_Error (Ref_Nam : Name_Id) is | |
2392 | begin | |
2393 | -- The corresponding spec already contains the aspect in | |
2394 | -- question and the one appearing on the body must be the | |
2395 | -- refined form: | |
2396 | ||
2397 | -- procedure P with Global ...; | |
2398 | -- procedure P with Global ... is ... end P; | |
2399 | -- ^ | |
2400 | -- Refined_Global | |
2401 | ||
2402 | if Has_Aspect (Spec_Id, Asp_Id) then | |
2403 | Error_Msg_Name_1 := Asp_Nam; | |
2404 | ||
2405 | -- Subunits cannot carry aspects that apply to a subprogram | |
2406 | -- declaration. | |
2407 | ||
2408 | if Nkind (Parent (N)) = N_Subunit then | |
2409 | Error_Msg_N ("aspect % cannot apply to a subunit", Asp); | |
2410 | ||
2411 | else | |
2412 | Error_Msg_Name_2 := Ref_Nam; | |
2413 | Error_Msg_N ("aspect % should be %", Asp); | |
2414 | end if; | |
2415 | ||
2416 | -- Otherwise the aspect must appear in the spec, not in the | |
2417 | -- body: | |
2418 | ||
2419 | -- procedure P; | |
2420 | -- procedure P with Global ... is ... end P; | |
2421 | ||
2422 | else | |
2423 | Error_Msg_N | |
2424 | ("aspect specification must appear in subprogram " | |
2425 | & "declaration", Asp); | |
2426 | end if; | |
2427 | end SPARK_Aspect_Error; | |
2428 | ||
2429 | -- Start of processing for Diagnose_Misplaced_Aspects | |
2430 | ||
2431 | begin | |
2432 | -- Iterate over the aspect specifications and emit specific errors | |
2433 | -- where applicable. | |
2434 | ||
2435 | Asp := First (Aspect_Specifications (N)); | |
2436 | while Present (Asp) loop | |
2437 | Asp_Nam := Chars (Identifier (Asp)); | |
2438 | Asp_Id := Get_Aspect_Id (Asp_Nam); | |
2439 | ||
2440 | -- Do not emit errors on aspects that can appear on a | |
2441 | -- subprogram body. This scenario occurs when the aspect | |
2442 | -- specification list contains both misplaced and properly | |
2443 | -- placed aspects. | |
2444 | ||
2445 | if Aspect_On_Body_Or_Stub_OK (Asp_Id) then | |
2446 | null; | |
2447 | ||
2448 | -- Special diagnostics for SPARK aspects | |
2449 | ||
2450 | elsif Asp_Nam = Name_Depends then | |
2451 | SPARK_Aspect_Error (Name_Refined_Depends); | |
2452 | ||
2453 | elsif Asp_Nam = Name_Global then | |
2454 | SPARK_Aspect_Error (Name_Refined_Global); | |
2455 | ||
2456 | elsif Asp_Nam = Name_Post then | |
2457 | SPARK_Aspect_Error (Name_Refined_Post); | |
2458 | ||
2459 | else | |
2460 | Error_Msg_N | |
2461 | ("aspect specification must appear in subprogram " | |
2462 | & "declaration", Asp); | |
2463 | end if; | |
2464 | ||
2465 | Next (Asp); | |
2466 | end loop; | |
2467 | end Diagnose_Misplaced_Aspects; | |
2468 | ||
2469 | -- Start of processing for Analyze_Aspects_On_Body_Or_Stub | |
2470 | ||
2471 | begin | |
2472 | -- Language-defined aspects cannot be associated with a subprogram | |
2473 | -- body [stub] if the subprogram has a spec. Certain implementation | |
2474 | -- defined aspects are allowed to break this rule (for list, see | |
2475 | -- table Aspect_On_Body_Or_Stub_OK). | |
2476 | ||
2477 | if Present (Spec_Id) and then not Aspects_On_Body_Or_Stub_OK (N) then | |
2478 | Diagnose_Misplaced_Aspects; | |
2479 | else | |
2480 | Analyze_Aspect_Specifications (N, Body_Id); | |
2481 | end if; | |
2482 | end Analyze_Aspects_On_Body_Or_Stub; | |
2483 | ||
ac072cb2 AC |
2484 | ----------------------- |
2485 | -- Body_Has_Contract -- | |
2486 | ----------------------- | |
2487 | ||
2488 | function Body_Has_Contract return Boolean is | |
2489 | Decls : constant List_Id := Declarations (N); | |
2490 | A_Spec : Node_Id; | |
2491 | A : Aspect_Id; | |
2492 | Decl : Node_Id; | |
2493 | P_Id : Pragma_Id; | |
2494 | ||
2495 | begin | |
2496 | -- Check for unanalyzed aspects in the body that will | |
2497 | -- generate a contract. | |
2498 | ||
2499 | if Present (Aspect_Specifications (N)) then | |
2500 | A_Spec := First (Aspect_Specifications (N)); | |
2501 | while Present (A_Spec) loop | |
2502 | A := Get_Aspect_Id (Chars (Identifier (A_Spec))); | |
2503 | ||
1399d355 AC |
2504 | if A = Aspect_Contract_Cases or else |
2505 | A = Aspect_Depends or else | |
2506 | A = Aspect_Global or else | |
2507 | A = Aspect_Pre or else | |
2508 | A = Aspect_Precondition or else | |
2509 | A = Aspect_Post or else | |
2510 | A = Aspect_Postcondition | |
ac072cb2 AC |
2511 | then |
2512 | return True; | |
2513 | end if; | |
2514 | ||
2515 | Next (A_Spec); | |
2516 | end loop; | |
2517 | end if; | |
2518 | ||
1399d355 | 2519 | -- Check for pragmas that may generate a contract |
ac072cb2 AC |
2520 | |
2521 | if Present (Decls) then | |
2522 | Decl := First (Decls); | |
2523 | while Present (Decl) loop | |
2524 | if Nkind (Decl) = N_Pragma then | |
2525 | P_Id := Get_Pragma_Id (Pragma_Name (Decl)); | |
2526 | ||
1399d355 AC |
2527 | if P_Id = Pragma_Contract_Cases or else |
2528 | P_Id = Pragma_Depends or else | |
2529 | P_Id = Pragma_Global or else | |
2530 | P_Id = Pragma_Pre or else | |
2531 | P_Id = Pragma_Precondition or else | |
2532 | P_Id = Pragma_Post or else | |
2533 | P_Id = Pragma_Postcondition | |
ac072cb2 AC |
2534 | then |
2535 | return True; | |
2536 | end if; | |
2537 | end if; | |
2538 | ||
2539 | Next (Decl); | |
2540 | end loop; | |
2541 | end if; | |
2542 | ||
2543 | return False; | |
2544 | end Body_Has_Contract; | |
2545 | ||
ec4867fa ES |
2546 | ---------------------------- |
2547 | -- Check_Anonymous_Return -- | |
2548 | ---------------------------- | |
2549 | ||
2550 | procedure Check_Anonymous_Return is | |
2551 | Decl : Node_Id; | |
a523b302 | 2552 | Par : Node_Id; |
ec4867fa ES |
2553 | Scop : Entity_Id; |
2554 | ||
2555 | begin | |
2556 | if Present (Spec_Id) then | |
2557 | Scop := Spec_Id; | |
2558 | else | |
2559 | Scop := Body_Id; | |
2560 | end if; | |
2561 | ||
2562 | if Ekind (Scop) = E_Function | |
2563 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 | 2564 | and then not Is_Thunk (Scop) |
4b963531 AC |
2565 | |
2566 | -- Skip internally built functions which handle the case of | |
2567 | -- a null access (see Expand_Interface_Conversion) | |
2568 | ||
2569 | and then not (Is_Interface (Designated_Type (Etype (Scop))) | |
4b6f99f5 | 2570 | and then not Comes_From_Source (Parent (Scop))) |
4b963531 | 2571 | |
a523b302 JM |
2572 | and then (Has_Task (Designated_Type (Etype (Scop))) |
2573 | or else | |
4b6f99f5 RD |
2574 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) |
2575 | and then | |
2576 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 2577 | and then Expander_Active |
b20de9b9 | 2578 | |
8fde064e | 2579 | -- Avoid cases with no tasking support |
b20de9b9 AC |
2580 | |
2581 | and then RTE_Available (RE_Current_Master) | |
2582 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
2583 | then |
2584 | Decl := | |
2585 | Make_Object_Declaration (Loc, | |
2586 | Defining_Identifier => | |
2587 | Make_Defining_Identifier (Loc, Name_uMaster), | |
2588 | Constant_Present => True, | |
2589 | Object_Definition => | |
e4494292 | 2590 | New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
ec4867fa ES |
2591 | Expression => |
2592 | Make_Explicit_Dereference (Loc, | |
e4494292 | 2593 | New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
ec4867fa ES |
2594 | |
2595 | if Present (Declarations (N)) then | |
2596 | Prepend (Decl, Declarations (N)); | |
2597 | else | |
2598 | Set_Declarations (N, New_List (Decl)); | |
2599 | end if; | |
2600 | ||
2601 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
2602 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
2603 | |
2604 | -- Now mark the containing scope as a task master | |
2605 | ||
2606 | Par := N; | |
2607 | while Nkind (Par) /= N_Compilation_Unit loop | |
2608 | Par := Parent (Par); | |
2609 | pragma Assert (Present (Par)); | |
2610 | ||
2611 | -- If we fall off the top, we are at the outer level, and | |
2612 | -- the environment task is our effective master, so nothing | |
2613 | -- to mark. | |
2614 | ||
2615 | if Nkind_In | |
2616 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
2617 | then | |
2618 | Set_Is_Task_Master (Par, True); | |
2619 | exit; | |
2620 | end if; | |
2621 | end loop; | |
ec4867fa ES |
2622 | end if; |
2623 | end Check_Anonymous_Return; | |
2624 | ||
e660dbf7 JM |
2625 | ------------------------- |
2626 | -- Check_Inline_Pragma -- | |
2627 | ------------------------- | |
758c442c | 2628 | |
e660dbf7 JM |
2629 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
2630 | Prag : Node_Id; | |
2631 | Plist : List_Id; | |
0fb2ea01 | 2632 | |
21d27997 | 2633 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 2634 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 2635 | -- to this subprogram. |
21d27997 RD |
2636 | |
2637 | ----------------------- | |
2638 | -- Is_Inline_Pragma -- | |
2639 | ----------------------- | |
2640 | ||
2641 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
2642 | begin | |
2643 | return | |
2644 | Nkind (N) = N_Pragma | |
2645 | and then | |
8fde064e | 2646 | (Pragma_Name (N) = Name_Inline_Always |
4b6f99f5 RD |
2647 | or else (Front_End_Inlining |
2648 | and then Pragma_Name (N) = Name_Inline)) | |
21d27997 | 2649 | and then |
8fde064e AC |
2650 | Chars |
2651 | (Expression (First (Pragma_Argument_Associations (N)))) = | |
2652 | Chars (Body_Id); | |
21d27997 RD |
2653 | end Is_Inline_Pragma; |
2654 | ||
2655 | -- Start of processing for Check_Inline_Pragma | |
2656 | ||
c37bb106 | 2657 | begin |
e660dbf7 JM |
2658 | if not Expander_Active then |
2659 | return; | |
2660 | end if; | |
2661 | ||
2662 | if Is_List_Member (N) | |
2663 | and then Present (Next (N)) | |
21d27997 | 2664 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2665 | then |
2666 | Prag := Next (N); | |
2667 | ||
21d27997 RD |
2668 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2669 | and then Present (Declarations (N)) | |
2670 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2671 | then | |
2672 | Prag := First (Declarations (N)); | |
2673 | ||
e660dbf7 JM |
2674 | else |
2675 | Prag := Empty; | |
c37bb106 | 2676 | end if; |
e660dbf7 JM |
2677 | |
2678 | if Present (Prag) then | |
2679 | if Present (Spec_Id) then | |
30196a76 | 2680 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
2681 | Analyze (Prag); |
2682 | end if; | |
2683 | ||
2684 | else | |
d39d6bb8 | 2685 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
2686 | |
2687 | declare | |
2688 | Subp : constant Entity_Id := | |
30196a76 | 2689 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 2690 | Decl : constant Node_Id := |
30196a76 RD |
2691 | Make_Subprogram_Declaration (Loc, |
2692 | Specification => | |
2693 | New_Copy_Tree (Specification (N))); | |
2694 | ||
e660dbf7 JM |
2695 | begin |
2696 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
2697 | ||
2698 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 2699 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2700 | Set_Parameter_Specifications |
2701 | (Specification (Decl), Plist); | |
2702 | end if; | |
2703 | ||
2704 | Insert_Before (N, Decl); | |
2705 | Analyze (Decl); | |
2706 | Analyze (Prag); | |
2707 | Set_Has_Pragma_Inline (Subp); | |
2708 | ||
76a69663 | 2709 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2710 | Set_Is_Inlined (Subp); |
21d27997 | 2711 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2712 | end if; |
2713 | ||
158d55fa AC |
2714 | -- Prior to copying the subprogram body to create a template |
2715 | -- for it for subsequent inlining, remove the pragma from | |
2716 | -- the current body so that the copy that will produce the | |
2717 | -- new body will start from a completely unanalyzed tree. | |
2718 | ||
2719 | if Nkind (Parent (Prag)) = N_Subprogram_Body then | |
2720 | Rewrite (Prag, Make_Null_Statement (Sloc (Prag))); | |
2721 | end if; | |
2722 | ||
e660dbf7 JM |
2723 | Spec := Subp; |
2724 | end; | |
2725 | end if; | |
2726 | end if; | |
2727 | end Check_Inline_Pragma; | |
2728 | ||
7665e4bd AC |
2729 | -------------------------- |
2730 | -- Check_Missing_Return -- | |
2731 | -------------------------- | |
2732 | ||
2733 | procedure Check_Missing_Return is | |
2734 | Id : Entity_Id; | |
2735 | Missing_Ret : Boolean; | |
2736 | ||
2737 | begin | |
2738 | if Nkind (Body_Spec) = N_Function_Specification then | |
2739 | if Present (Spec_Id) then | |
2740 | Id := Spec_Id; | |
2741 | else | |
2742 | Id := Body_Id; | |
2743 | end if; | |
2744 | ||
fe5d3068 | 2745 | if Return_Present (Id) then |
7665e4bd AC |
2746 | Check_Returns (HSS, 'F', Missing_Ret); |
2747 | ||
2748 | if Missing_Ret then | |
2749 | Set_Has_Missing_Return (Id); | |
2750 | end if; | |
2751 | ||
2aca76d6 AC |
2752 | elsif Is_Generic_Subprogram (Id) |
2753 | or else not Is_Machine_Code_Subprogram (Id) | |
7665e4bd AC |
2754 | then |
2755 | Error_Msg_N ("missing RETURN statement in function body", N); | |
2756 | end if; | |
2757 | ||
fe5d3068 | 2758 | -- If procedure with No_Return, check returns |
607d0635 | 2759 | |
fe5d3068 YM |
2760 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
2761 | and then Present (Spec_Id) | |
2762 | and then No_Return (Spec_Id) | |
607d0635 | 2763 | then |
fe5d3068 YM |
2764 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
2765 | end if; | |
2766 | ||
ad05f2e9 | 2767 | -- Special checks in SPARK mode |
fe5d3068 YM |
2768 | |
2769 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 2770 | |
ad05f2e9 | 2771 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
2772 | |
2773 | declare | |
2774 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
2775 | begin | |
2776 | if Present (Stat) | |
7394c8cc AC |
2777 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
2778 | N_Extended_Return_Statement) | |
fe5d3068 | 2779 | then |
ce5ba43a | 2780 | Check_SPARK_05_Restriction |
fe5d3068 YM |
2781 | ("last statement in function should be RETURN", Stat); |
2782 | end if; | |
2783 | end; | |
2784 | ||
ad05f2e9 | 2785 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
2786 | |
2787 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
2788 | if Present (Spec_Id) then |
2789 | Id := Spec_Id; | |
2790 | else | |
2791 | Id := Body_Id; | |
2792 | end if; | |
2793 | ||
8d606a78 RD |
2794 | -- Would be nice to point to return statement here, can we |
2795 | -- borrow the Check_Returns procedure here ??? | |
2796 | ||
607d0635 | 2797 | if Return_Present (Id) then |
ce5ba43a | 2798 | Check_SPARK_05_Restriction |
fe5d3068 | 2799 | ("procedure should not have RETURN", N); |
607d0635 | 2800 | end if; |
7665e4bd AC |
2801 | end if; |
2802 | end Check_Missing_Return; | |
2803 | ||
d44202ba HK |
2804 | ----------------------- |
2805 | -- Disambiguate_Spec -- | |
2806 | ----------------------- | |
2807 | ||
2808 | function Disambiguate_Spec return Entity_Id is | |
2809 | Priv_Spec : Entity_Id; | |
2810 | Spec_N : Entity_Id; | |
2811 | ||
2812 | procedure Replace_Types (To_Corresponding : Boolean); | |
2813 | -- Depending on the flag, replace the type of formal parameters of | |
2814 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2815 | -- the corresponding record type or the other way around. | |
2816 | ||
2817 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2818 | Formal : Entity_Id; | |
2819 | Formal_Typ : Entity_Id; | |
2820 | ||
2821 | begin | |
2822 | Formal := First_Formal (Body_Id); | |
2823 | while Present (Formal) loop | |
2824 | Formal_Typ := Etype (Formal); | |
2825 | ||
df3e68b1 HK |
2826 | if Is_Class_Wide_Type (Formal_Typ) then |
2827 | Formal_Typ := Root_Type (Formal_Typ); | |
2828 | end if; | |
2829 | ||
d44202ba HK |
2830 | -- From concurrent type to corresponding record |
2831 | ||
2832 | if To_Corresponding then | |
2833 | if Is_Concurrent_Type (Formal_Typ) | |
2834 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4b6f99f5 RD |
2835 | and then |
2836 | Present (Interfaces | |
2837 | (Corresponding_Record_Type (Formal_Typ))) | |
d44202ba HK |
2838 | then |
2839 | Set_Etype (Formal, | |
2840 | Corresponding_Record_Type (Formal_Typ)); | |
2841 | end if; | |
2842 | ||
2843 | -- From corresponding record to concurrent type | |
2844 | ||
2845 | else | |
2846 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2847 | and then Present (Interfaces (Formal_Typ)) | |
2848 | then | |
2849 | Set_Etype (Formal, | |
2850 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2851 | end if; | |
2852 | end if; | |
2853 | ||
2854 | Next_Formal (Formal); | |
2855 | end loop; | |
2856 | end Replace_Types; | |
2857 | ||
2858 | -- Start of processing for Disambiguate_Spec | |
2859 | ||
2860 | begin | |
2861 | -- Try to retrieve the specification of the body as is. All error | |
2862 | -- messages are suppressed because the body may not have a spec in | |
2863 | -- its current state. | |
2864 | ||
2865 | Spec_N := Find_Corresponding_Spec (N, False); | |
2866 | ||
2867 | -- It is possible that this is the body of a primitive declared | |
2868 | -- between a private and a full view of a concurrent type. The | |
2869 | -- controlling parameter of the spec carries the concurrent type, | |
2870 | -- not the corresponding record type as transformed by Analyze_ | |
2871 | -- Subprogram_Specification. In such cases, we undo the change | |
2872 | -- made by the analysis of the specification and try to find the | |
2873 | -- spec again. | |
766d7add | 2874 | |
8198b93d HK |
2875 | -- Note that wrappers already have their corresponding specs and |
2876 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2877 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2878 | -- original concurrent status. |
d44202ba | 2879 | |
8198b93d HK |
2880 | if No (Spec_N) |
2881 | or else Is_Primitive_Wrapper (Spec_N) | |
2882 | then | |
d44202ba HK |
2883 | -- Restore all references of corresponding record types to the |
2884 | -- original concurrent types. | |
2885 | ||
2886 | Replace_Types (To_Corresponding => False); | |
2887 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2888 | ||
2889 | -- The current body truly belongs to a primitive declared between | |
2890 | -- a private and a full view. We leave the modified body as is, | |
2891 | -- and return the true spec. | |
2892 | ||
2893 | if Present (Priv_Spec) | |
2894 | and then Is_Private_Primitive (Priv_Spec) | |
2895 | then | |
2896 | return Priv_Spec; | |
2897 | end if; | |
2898 | ||
2899 | -- In case that this is some sort of error, restore the original | |
2900 | -- state of the body. | |
2901 | ||
2902 | Replace_Types (To_Corresponding => True); | |
2903 | end if; | |
2904 | ||
2905 | return Spec_N; | |
2906 | end Disambiguate_Spec; | |
2907 | ||
5dcab3ca AC |
2908 | ---------------------------- |
2909 | -- Exchange_Limited_Views -- | |
2910 | ---------------------------- | |
2911 | ||
2912 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id) is | |
2913 | procedure Detect_And_Exchange (Id : Entity_Id); | |
2914 | -- Determine whether Id's type denotes an incomplete type associated | |
2915 | -- with a limited with clause and exchange the limited view with the | |
2916 | -- non-limited one. | |
2917 | ||
2918 | ------------------------- | |
2919 | -- Detect_And_Exchange -- | |
2920 | ------------------------- | |
2921 | ||
2922 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
2923 | Typ : constant Entity_Id := Etype (Id); | |
5dcab3ca | 2924 | begin |
e23e04db | 2925 | if From_Limited_With (Typ) and then Has_Non_Limited_View (Typ) then |
5dcab3ca AC |
2926 | Set_Etype (Id, Non_Limited_View (Typ)); |
2927 | end if; | |
2928 | end Detect_And_Exchange; | |
2929 | ||
2930 | -- Local variables | |
2931 | ||
2932 | Formal : Entity_Id; | |
2933 | ||
2934 | -- Start of processing for Exchange_Limited_Views | |
2935 | ||
2936 | begin | |
2937 | if No (Subp_Id) then | |
2938 | return; | |
2939 | ||
2940 | -- Do not process subprogram bodies as they already use the non- | |
2941 | -- limited view of types. | |
2942 | ||
2943 | elsif not Ekind_In (Subp_Id, E_Function, E_Procedure) then | |
2944 | return; | |
2945 | end if; | |
2946 | ||
2947 | -- Examine all formals and swap views when applicable | |
2948 | ||
2949 | Formal := First_Formal (Subp_Id); | |
2950 | while Present (Formal) loop | |
2951 | Detect_And_Exchange (Formal); | |
2952 | ||
2953 | Next_Formal (Formal); | |
2954 | end loop; | |
2955 | ||
2956 | -- Process the return type of a function | |
2957 | ||
2958 | if Ekind (Subp_Id) = E_Function then | |
2959 | Detect_And_Exchange (Subp_Id); | |
2960 | end if; | |
2961 | end Exchange_Limited_Views; | |
2962 | ||
d44202ba HK |
2963 | ------------------------------------- |
2964 | -- Is_Private_Concurrent_Primitive -- | |
2965 | ------------------------------------- | |
2966 | ||
2967 | function Is_Private_Concurrent_Primitive | |
2968 | (Subp_Id : Entity_Id) return Boolean | |
2969 | is | |
2970 | Formal_Typ : Entity_Id; | |
2971 | ||
2972 | begin | |
2973 | if Present (First_Formal (Subp_Id)) then | |
2974 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2975 | ||
2976 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2977 | if Is_Class_Wide_Type (Formal_Typ) then |
2978 | Formal_Typ := Root_Type (Formal_Typ); | |
2979 | end if; | |
2980 | ||
d44202ba HK |
2981 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2982 | end if; | |
2983 | ||
2984 | -- The type of the first formal is a concurrent tagged type with | |
2985 | -- a private view. | |
2986 | ||
2987 | return | |
2988 | Is_Concurrent_Type (Formal_Typ) | |
2989 | and then Is_Tagged_Type (Formal_Typ) | |
2990 | and then Has_Private_Declaration (Formal_Typ); | |
2991 | end if; | |
2992 | ||
2993 | return False; | |
2994 | end Is_Private_Concurrent_Primitive; | |
2995 | ||
76a69663 ES |
2996 | ---------------------------- |
2997 | -- Set_Trivial_Subprogram -- | |
2998 | ---------------------------- | |
2999 | ||
3000 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
3001 | Nxt : constant Node_Id := Next (N); | |
3002 | ||
3003 | begin | |
3004 | Set_Is_Trivial_Subprogram (Body_Id); | |
3005 | ||
3006 | if Present (Spec_Id) then | |
3007 | Set_Is_Trivial_Subprogram (Spec_Id); | |
3008 | end if; | |
3009 | ||
3010 | if Present (Nxt) | |
3011 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
3012 | and then No (Next (Nxt)) | |
3013 | and then Present (Expression (Nxt)) | |
3014 | and then Is_Entity_Name (Expression (Nxt)) | |
3015 | then | |
3016 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
3017 | end if; | |
3018 | end Set_Trivial_Subprogram; | |
3019 | ||
758c442c GD |
3020 | --------------------------------- |
3021 | -- Verify_Overriding_Indicator -- | |
3022 | --------------------------------- | |
3023 | ||
3024 | procedure Verify_Overriding_Indicator is | |
3025 | begin | |
21d27997 RD |
3026 | if Must_Override (Body_Spec) then |
3027 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
4b6f99f5 | 3028 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 RD |
3029 | then |
3030 | null; | |
3031 | ||
038140ed | 3032 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 3033 | Error_Msg_NE |
21d27997 | 3034 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
23e28b42 AC |
3035 | |
3036 | -- Overriding indicators aren't allowed for protected subprogram | |
3037 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
3038 | -- this to a warning if -gnatd.E is enabled. | |
3039 | ||
3040 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
3041 | Error_Msg_Warn := Error_To_Warning; | |
3042 | Error_Msg_N | |
b785e0b8 | 3043 | ("<<overriding indicator not allowed for protected " |
23e28b42 | 3044 | & "subprogram body", Body_Spec); |
21d27997 | 3045 | end if; |
758c442c | 3046 | |
5d37ba92 | 3047 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 3048 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 3049 | Error_Msg_NE |
5d37ba92 | 3050 | ("subprogram& overrides inherited operation", |
76a69663 | 3051 | Body_Spec, Spec_Id); |
5d37ba92 | 3052 | |
21d27997 | 3053 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
4b6f99f5 | 3054 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 | 3055 | then |
ed2233dc | 3056 | Error_Msg_NE |
3ccedacc | 3057 | ("subprogram& overrides predefined operator ", |
21d27997 RD |
3058 | Body_Spec, Spec_Id); |
3059 | ||
23e28b42 AC |
3060 | -- Overriding indicators aren't allowed for protected subprogram |
3061 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
3062 | -- this to a warning if -gnatd.E is enabled. | |
3063 | ||
3064 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
3065 | Error_Msg_Warn := Error_To_Warning; | |
5d37ba92 | 3066 | |
23e28b42 | 3067 | Error_Msg_N |
3ccedacc AC |
3068 | ("<<overriding indicator not allowed " |
3069 | & "for protected subprogram body", Body_Spec); | |
23e28b42 AC |
3070 | |
3071 | -- If this is not a primitive operation, then the overriding | |
3072 | -- indicator is altogether illegal. | |
3073 | ||
3074 | elsif not Is_Primitive (Spec_Id) then | |
ed2233dc | 3075 | Error_Msg_N |
3ccedacc AC |
3076 | ("overriding indicator only allowed " |
3077 | & "if subprogram is primitive", Body_Spec); | |
5d37ba92 | 3078 | end if; |
235f4375 | 3079 | |
23e28b42 AC |
3080 | -- If checking the style rule and the operation overrides, then |
3081 | -- issue a warning about a missing overriding_indicator. Protected | |
3082 | -- subprogram bodies are excluded from this style checking, since | |
3083 | -- they aren't primitives (even though their declarations can | |
3084 | -- override) and aren't allowed to have an overriding_indicator. | |
3085 | ||
806f6d37 | 3086 | elsif Style_Check |
038140ed | 3087 | and then Present (Overridden_Operation (Spec_Id)) |
23e28b42 | 3088 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type |
235f4375 AC |
3089 | then |
3090 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3091 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
3092 | |
3093 | elsif Style_Check | |
3094 | and then Can_Override_Operator (Spec_Id) | |
3095 | and then not Is_Predefined_File_Name | |
3096 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
3097 | then | |
3098 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3099 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
3100 | end if; |
3101 | end Verify_Overriding_Indicator; | |
3102 | ||
b1b543d2 | 3103 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 3104 | |
996ae0b0 | 3105 | begin |
82c80734 RD |
3106 | -- Generic subprograms are handled separately. They always have a |
3107 | -- generic specification. Determine whether current scope has a | |
3108 | -- previous declaration. | |
996ae0b0 | 3109 | |
82c80734 RD |
3110 | -- If the subprogram body is defined within an instance of the same |
3111 | -- name, the instance appears as a package renaming, and will be hidden | |
3112 | -- within the subprogram. | |
996ae0b0 RK |
3113 | |
3114 | if Present (Prev_Id) | |
3115 | and then not Is_Overloadable (Prev_Id) | |
3116 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
3117 | or else Comes_From_Source (Prev_Id)) | |
3118 | then | |
fbf5a39b | 3119 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 | 3120 | Spec_Id := Prev_Id; |
8636f52f HK |
3121 | |
3122 | -- The corresponding spec may be subject to pragma Ghost with | |
3123 | -- policy Ignore. Set the mode now to ensure that any nodes | |
3124 | -- generated during analysis and expansion are properly flagged | |
3125 | -- as ignored Ghost. | |
3126 | ||
3127 | Set_Ghost_Mode (N, Spec_Id); | |
996ae0b0 RK |
3128 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); |
3129 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3130 | ||
3131 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
3132 | |
3133 | if Nkind (N) = N_Subprogram_Body then | |
3134 | HSS := Handled_Statement_Sequence (N); | |
3135 | Check_Missing_Return; | |
3136 | end if; | |
3137 | ||
996ae0b0 RK |
3138 | return; |
3139 | ||
3140 | else | |
82c80734 RD |
3141 | -- Previous entity conflicts with subprogram name. Attempting to |
3142 | -- enter name will post error. | |
996ae0b0 RK |
3143 | |
3144 | Enter_Name (Body_Id); | |
3145 | return; | |
3146 | end if; | |
3147 | ||
82c80734 RD |
3148 | -- Non-generic case, find the subprogram declaration, if one was seen, |
3149 | -- or enter new overloaded entity in the current scope. If the | |
3150 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
3151 | -- part of the context of one of its subunits. No need to redo the | |
3152 | -- analysis. | |
996ae0b0 | 3153 | |
8fde064e | 3154 | elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
996ae0b0 RK |
3155 | return; |
3156 | ||
3157 | else | |
fbf5a39b | 3158 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
3159 | |
3160 | if Nkind (N) = N_Subprogram_Body_Stub | |
3161 | or else No (Corresponding_Spec (N)) | |
3162 | then | |
d44202ba HK |
3163 | if Is_Private_Concurrent_Primitive (Body_Id) then |
3164 | Spec_Id := Disambiguate_Spec; | |
8636f52f HK |
3165 | |
3166 | -- The corresponding spec may be subject to pragma Ghost with | |
3167 | -- policy Ignore. Set the mode now to ensure that any nodes | |
3168 | -- generated during analysis and expansion are properly flagged | |
3169 | -- as ignored Ghost. | |
3170 | ||
3171 | Set_Ghost_Mode (N, Spec_Id); | |
3172 | ||
d44202ba HK |
3173 | else |
3174 | Spec_Id := Find_Corresponding_Spec (N); | |
b6c8e5be | 3175 | |
8636f52f HK |
3176 | -- The corresponding spec may be subject to pragma Ghost with |
3177 | -- policy Ignore. Set the mode now to ensure that any nodes | |
3178 | -- generated during analysis and expansion are properly flagged | |
3179 | -- as ignored Ghost. | |
3180 | ||
3181 | Set_Ghost_Mode (N, Spec_Id); | |
3182 | ||
b6c8e5be AC |
3183 | -- In GNATprove mode, if the body has no previous spec, create |
3184 | -- one so that the inlining machinery can operate properly. | |
3185 | -- Transfer aspects, if any, to the new spec, so that they | |
3186 | -- are legal and can be processed ahead of the body. | |
3187 | -- We make two copies of the given spec, one for the new | |
3188 | -- declaration, and one for the body. | |
3189 | ||
5a271a7f | 3190 | if No (Spec_Id) and then GNATprove_Mode |
480156b2 | 3191 | |
480156b2 AC |
3192 | -- Inlining does not apply during pre-analysis of code |
3193 | ||
b6c8e5be | 3194 | and then Full_Analysis |
480156b2 AC |
3195 | |
3196 | -- Inlining only applies to full bodies, not stubs | |
3197 | ||
7b2888e6 | 3198 | and then Nkind (N) /= N_Subprogram_Body_Stub |
480156b2 AC |
3199 | |
3200 | -- Inlining only applies to bodies in the source code, not to | |
3201 | -- those generated by the compiler. In particular, expression | |
3202 | -- functions, whose body is generated by the compiler, are | |
3203 | -- treated specially by GNATprove. | |
3204 | ||
b6c8e5be | 3205 | and then Comes_From_Source (Body_Id) |
480156b2 AC |
3206 | |
3207 | -- This cannot be done for a compilation unit, which is not | |
3208 | -- in a context where we can insert a new spec. | |
3209 | ||
b6c8e5be | 3210 | and then Is_List_Member (N) |
480156b2 AC |
3211 | |
3212 | -- Inlining only applies to subprograms without contracts, | |
3213 | -- as a contract is a sign that GNATprove should perform a | |
3214 | -- modular analysis of the subprogram instead of a contextual | |
3215 | -- analysis at each call site. The same test is performed in | |
3216 | -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated | |
3217 | -- here in another form (because the contract has not | |
3218 | -- been attached to the body) to avoid frontend errors in | |
3219 | -- case pragmas are used instead of aspects, because the | |
3220 | -- corresponding pragmas in the body would not be transferred | |
3221 | -- to the spec, leading to legality errors. | |
3222 | ||
ac072cb2 | 3223 | and then not Body_Has_Contract |
b6c8e5be AC |
3224 | then |
3225 | declare | |
3226 | Body_Spec : constant Node_Id := | |
662c2ad4 | 3227 | Copy_Separate_Tree (Specification (N)); |
eb1ee757 AC |
3228 | New_Decl : constant Node_Id := |
3229 | Make_Subprogram_Declaration (Loc, | |
3230 | Copy_Separate_Tree (Specification (N))); | |
3231 | ||
2178830b | 3232 | SPARK_Mode_Aspect : Node_Id; |
eb1ee757 AC |
3233 | Aspects : List_Id; |
3234 | Prag, Aspect : Node_Id; | |
b6c8e5be AC |
3235 | |
3236 | begin | |
3237 | Insert_Before (N, New_Decl); | |
3238 | Move_Aspects (From => N, To => New_Decl); | |
2178830b AC |
3239 | |
3240 | -- Mark the newly moved aspects as not analyzed, so that | |
3241 | -- their effect on New_Decl is properly analyzed. | |
3242 | ||
3243 | Aspect := First (Aspect_Specifications (New_Decl)); | |
3244 | while Present (Aspect) loop | |
3245 | Set_Analyzed (Aspect, False); | |
3246 | Next (Aspect); | |
3247 | end loop; | |
3248 | ||
b6c8e5be | 3249 | Analyze (New_Decl); |
2178830b AC |
3250 | |
3251 | -- The analysis of the generated subprogram declaration | |
eb1ee757 | 3252 | -- may have introduced pragmas that need to be analyzed. |
2178830b AC |
3253 | |
3254 | Prag := Next (New_Decl); | |
3255 | while Prag /= N loop | |
3256 | Analyze (Prag); | |
3257 | Next (Prag); | |
3258 | end loop; | |
3259 | ||
b6c8e5be AC |
3260 | Spec_Id := Defining_Entity (New_Decl); |
3261 | ||
793c5f05 AC |
3262 | -- As Body_Id originally comes from source, mark the new |
3263 | -- Spec_Id as such, which is required so that calls to | |
3264 | -- this subprogram are registered in the local effects | |
3265 | -- stored in ALI files for GNATprove. | |
3266 | ||
3267 | Set_Comes_From_Source (Spec_Id, True); | |
3268 | ||
2178830b AC |
3269 | -- If aspect SPARK_Mode was specified on the body, it |
3270 | -- needs to be repeated on the generated decl and the | |
3271 | -- body. Since the original aspect was moved to the | |
3272 | -- generated decl, copy it for the body. | |
3273 | ||
3274 | if Has_Aspect (Spec_Id, Aspect_SPARK_Mode) then | |
3275 | SPARK_Mode_Aspect := | |
3276 | New_Copy (Find_Aspect (Spec_Id, Aspect_SPARK_Mode)); | |
3277 | Set_Analyzed (SPARK_Mode_Aspect, False); | |
eb1ee757 | 3278 | Aspects := New_List (SPARK_Mode_Aspect); |
2178830b AC |
3279 | Set_Aspect_Specifications (N, Aspects); |
3280 | end if; | |
3281 | ||
b6c8e5be AC |
3282 | Set_Specification (N, Body_Spec); |
3283 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); | |
3284 | Set_Corresponding_Spec (N, Spec_Id); | |
3285 | end; | |
3286 | end if; | |
d44202ba | 3287 | end if; |
996ae0b0 RK |
3288 | |
3289 | -- If this is a duplicate body, no point in analyzing it | |
3290 | ||
3291 | if Error_Posted (N) then | |
3292 | return; | |
3293 | end if; | |
3294 | ||
82c80734 RD |
3295 | -- A subprogram body should cause freezing of its own declaration, |
3296 | -- but if there was no previous explicit declaration, then the | |
3297 | -- subprogram will get frozen too late (there may be code within | |
3298 | -- the body that depends on the subprogram having been frozen, | |
3299 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 3300 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
3301 | -- Finally, if the return type is an anonymous access to protected |
3302 | -- subprogram, it must be frozen before the body because its | |
3303 | -- expansion has generated an equivalent type that is used when | |
3304 | -- elaborating the body. | |
996ae0b0 | 3305 | |
885c4871 | 3306 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
3307 | -- created for expression functions do not freeze. |
3308 | ||
3309 | if No (Spec_Id) | |
3310 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
3311 | then | |
996ae0b0 RK |
3312 | Freeze_Before (N, Body_Id); |
3313 | ||
3314 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
3315 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
3316 | |
3317 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
3318 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 3319 | end if; |
a38ff9b1 | 3320 | |
996ae0b0 RK |
3321 | else |
3322 | Spec_Id := Corresponding_Spec (N); | |
8636f52f HK |
3323 | |
3324 | -- The corresponding spec may be subject to pragma Ghost with | |
3325 | -- policy Ignore. Set the mode now to ensure that any nodes | |
3326 | -- generated during analysis and expansion are properly flagged | |
3327 | -- as ignored Ghost. | |
3328 | ||
3329 | Set_Ghost_Mode (N, Spec_Id); | |
996ae0b0 RK |
3330 | end if; |
3331 | end if; | |
3332 | ||
799d0e05 AC |
3333 | -- Previously we scanned the body to look for nested subprograms, and |
3334 | -- rejected an inline directive if nested subprograms were present, | |
3335 | -- because the back-end would generate conflicting symbols for the | |
c8957aae | 3336 | -- nested bodies. This is now unnecessary. |
07fc65c4 | 3337 | |
c8957aae | 3338 | -- Look ahead to recognize a pragma Inline that appears after the body |
84f4072a | 3339 | |
e660dbf7 JM |
3340 | Check_Inline_Pragma (Spec_Id); |
3341 | ||
701b7fbb RD |
3342 | -- Deal with special case of a fully private operation in the body of |
3343 | -- the protected type. We must create a declaration for the subprogram, | |
3344 | -- in order to attach the protected subprogram that will be used in | |
3345 | -- internal calls. We exclude compiler generated bodies from the | |
3346 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 3347 | |
996ae0b0 RK |
3348 | if No (Spec_Id) |
3349 | and then Comes_From_Source (N) | |
3350 | and then Is_Protected_Type (Current_Scope) | |
3351 | then | |
47bfea3a | 3352 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 3353 | end if; |
996ae0b0 | 3354 | |
5334d18f | 3355 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 3356 | |
701b7fbb | 3357 | if Present (Spec_Id) then |
996ae0b0 | 3358 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 3359 | Verify_Overriding_Indicator; |
5d37ba92 ES |
3360 | |
3361 | -- In general, the spec will be frozen when we start analyzing the | |
3362 | -- body. However, for internally generated operations, such as | |
3363 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
3364 | -- results, the spec may not have been frozen by the time we expand |
3365 | -- the freeze actions that include the bodies. In particular, extra | |
3366 | -- formals for accessibility or for return-in-place may need to be | |
3367 | -- generated. Freeze nodes, if any, are inserted before the current | |
3368 | -- body. These freeze actions are also needed in ASIS mode to enable | |
3369 | -- the proper back-annotations. | |
5d37ba92 ES |
3370 | |
3371 | if not Is_Frozen (Spec_Id) | |
7134062a | 3372 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
3373 | then |
3374 | -- Force the generation of its freezing node to ensure proper | |
3375 | -- management of access types in the backend. | |
3376 | ||
3377 | -- This is definitely needed for some cases, but it is not clear | |
3378 | -- why, to be investigated further??? | |
3379 | ||
3380 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 3381 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 3382 | end if; |
996ae0b0 RK |
3383 | end if; |
3384 | ||
3385 | -- Place subprogram on scope stack, and make formals visible. If there | |
3386 | -- is a spec, the visible entity remains that of the spec. | |
3387 | ||
3388 | if Present (Spec_Id) then | |
07fc65c4 | 3389 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
3390 | |
3391 | if Is_Child_Unit (Spec_Id) then | |
3392 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
3393 | end if; | |
3394 | ||
fbf5a39b AC |
3395 | if Style_Check then |
3396 | Style.Check_Identifier (Body_Id, Spec_Id); | |
3397 | end if; | |
996ae0b0 RK |
3398 | |
3399 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
3400 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3401 | ||
f937473f | 3402 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 3403 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
996ae0b0 | 3404 | return; |
21d27997 | 3405 | |
996ae0b0 RK |
3406 | else |
3407 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
3408 | Set_Has_Completion (Spec_Id); | |
3409 | ||
c5cec2fe AC |
3410 | -- Inherit the "ghostness" of the subprogram spec. Note that this |
3411 | -- property is not directly inherited as the body may be subject | |
3412 | -- to a different Ghost assertion policy. | |
3413 | ||
8636f52f | 3414 | if Is_Ghost_Entity (Spec_Id) or else Ghost_Mode > None then |
c5cec2fe AC |
3415 | Set_Is_Ghost_Entity (Body_Id); |
3416 | ||
3417 | -- The Ghost policy in effect at the point of declaration and | |
3c756b76 | 3418 | -- at the point of completion must match (SPARK RM 6.9(15)). |
c5cec2fe AC |
3419 | |
3420 | Check_Ghost_Completion (Spec_Id, Body_Id); | |
3421 | end if; | |
3422 | ||
996ae0b0 | 3423 | if Is_Protected_Type (Scope (Spec_Id)) then |
21d27997 | 3424 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
3425 | end if; |
3426 | ||
3427 | -- If this is a body generated for a renaming, do not check for | |
3428 | -- full conformance. The check is redundant, because the spec of | |
3429 | -- the body is a copy of the spec in the renaming declaration, | |
3430 | -- and the test can lead to spurious errors on nested defaults. | |
3431 | ||
3432 | if Present (Spec_Decl) | |
996ae0b0 | 3433 | and then not Comes_From_Source (N) |
93a81b02 GB |
3434 | and then |
3435 | (Nkind (Original_Node (Spec_Decl)) = | |
4b6f99f5 | 3436 | N_Subprogram_Renaming_Declaration |
466c2127 AC |
3437 | or else (Present (Corresponding_Body (Spec_Decl)) |
3438 | and then | |
3439 | Nkind (Unit_Declaration_Node | |
3440 | (Corresponding_Body (Spec_Decl))) = | |
3441 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
3442 | then |
3443 | Conformant := True; | |
cabe9abc AC |
3444 | |
3445 | -- Conversely, the spec may have been generated for specless body | |
3446 | -- with an inline pragma. | |
3447 | ||
3448 | elsif Comes_From_Source (N) | |
3449 | and then not Comes_From_Source (Spec_Id) | |
3450 | and then Has_Pragma_Inline (Spec_Id) | |
3451 | then | |
3452 | Conformant := True; | |
76a69663 | 3453 | |
996ae0b0 RK |
3454 | else |
3455 | Check_Conformance | |
3456 | (Body_Id, Spec_Id, | |
76a69663 | 3457 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
3458 | end if; |
3459 | ||
3460 | -- If the body is not fully conformant, we have to decide if we | |
3461 | -- should analyze it or not. If it has a really messed up profile | |
3462 | -- then we probably should not analyze it, since we will get too | |
3463 | -- many bogus messages. | |
3464 | ||
3465 | -- Our decision is to go ahead in the non-fully conformant case | |
3466 | -- only if it is at least mode conformant with the spec. Note | |
3467 | -- that the call to Check_Fully_Conformant has issued the proper | |
3468 | -- error messages to complain about the lack of conformance. | |
3469 | ||
3470 | if not Conformant | |
3471 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
3472 | then | |
3473 | return; | |
3474 | end if; | |
3475 | end if; | |
3476 | ||
996ae0b0 | 3477 | if Spec_Id /= Body_Id then |
fbf5a39b | 3478 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
3479 | end if; |
3480 | ||
579847c2 AC |
3481 | Set_Ekind (Body_Id, E_Subprogram_Body); |
3482 | ||
e28072cd AC |
3483 | if Nkind (N) = N_Subprogram_Body_Stub then |
3484 | Set_Corresponding_Spec_Of_Stub (N, Spec_Id); | |
3485 | ||
3486 | -- Regular body | |
3487 | ||
3488 | else | |
996ae0b0 | 3489 | Set_Corresponding_Spec (N, Spec_Id); |
758c442c | 3490 | |
5d37ba92 ES |
3491 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
3492 | -- of a concurrent type, the type of the first parameter has been | |
3493 | -- replaced with the corresponding record, which is the proper | |
3494 | -- run-time structure to use. However, within the body there may | |
3495 | -- be uses of the formals that depend on primitive operations | |
3496 | -- of the type (in particular calls in prefixed form) for which | |
3497 | -- we need the original concurrent type. The operation may have | |
3498 | -- several controlling formals, so the replacement must be done | |
3499 | -- for all of them. | |
758c442c GD |
3500 | |
3501 | if Comes_From_Source (Spec_Id) | |
3502 | and then Present (First_Entity (Spec_Id)) | |
3503 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
3504 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
15918371 AC |
3505 | and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
3506 | and then Present (Corresponding_Concurrent_Type | |
3507 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 3508 | then |
5d37ba92 ES |
3509 | declare |
3510 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
3511 | Form : Entity_Id; | |
3512 | ||
3513 | begin | |
3514 | Form := First_Formal (Spec_Id); | |
3515 | while Present (Form) loop | |
3516 | if Etype (Form) = Typ then | |
3517 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
3518 | end if; | |
3519 | ||
3520 | Next_Formal (Form); | |
3521 | end loop; | |
3522 | end; | |
758c442c GD |
3523 | end if; |
3524 | ||
21d27997 RD |
3525 | -- Make the formals visible, and place subprogram on scope stack. |
3526 | -- This is also the point at which we set Last_Real_Spec_Entity | |
3527 | -- to mark the entities which will not be moved to the body. | |
758c442c | 3528 | |
996ae0b0 | 3529 | Install_Formals (Spec_Id); |
21d27997 | 3530 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
616547fa AC |
3531 | |
3532 | -- Within an instance, add local renaming declarations so that | |
a5a809b2 AC |
3533 | -- gdb can retrieve the values of actuals more easily. This is |
3534 | -- only relevant if generating code (and indeed we definitely | |
3535 | -- do not want these definitions -gnatc mode, because that would | |
3536 | -- confuse ASIS). | |
616547fa AC |
3537 | |
3538 | if Is_Generic_Instance (Spec_Id) | |
3539 | and then Is_Wrapper_Package (Current_Scope) | |
a5a809b2 | 3540 | and then Expander_Active |
616547fa AC |
3541 | then |
3542 | Build_Subprogram_Instance_Renamings (N, Current_Scope); | |
3543 | end if; | |
3544 | ||
0a36105d | 3545 | Push_Scope (Spec_Id); |
996ae0b0 RK |
3546 | |
3547 | -- Make sure that the subprogram is immediately visible. For | |
3548 | -- child units that have no separate spec this is indispensable. | |
3549 | -- Otherwise it is safe albeit redundant. | |
3550 | ||
3551 | Set_Is_Immediately_Visible (Spec_Id); | |
3552 | end if; | |
3553 | ||
3554 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
ec4867fa | 3555 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
c9d70ab1 | 3556 | Set_Scope (Body_Id, Scope (Spec_Id)); |
996ae0b0 RK |
3557 | |
3558 | -- Case of subprogram body with no previous spec | |
3559 | ||
3560 | else | |
3e5daac4 AC |
3561 | -- Check for style warning required |
3562 | ||
996ae0b0 | 3563 | if Style_Check |
3e5daac4 AC |
3564 | |
3565 | -- Only apply check for source level subprograms for which checks | |
3566 | -- have not been suppressed. | |
3567 | ||
996ae0b0 RK |
3568 | and then Comes_From_Source (Body_Id) |
3569 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
3570 | |
3571 | -- No warnings within an instance | |
3572 | ||
996ae0b0 | 3573 | and then not In_Instance |
3e5daac4 | 3574 | |
b0186f71 | 3575 | -- No warnings for expression functions |
3e5daac4 | 3576 | |
b0186f71 | 3577 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
3578 | then |
3579 | Style.Body_With_No_Spec (N); | |
3580 | end if; | |
3581 | ||
3582 | New_Overloaded_Entity (Body_Id); | |
3583 | ||
3584 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
3585 | Set_Acts_As_Spec (N); | |
3586 | Generate_Definition (Body_Id); | |
fbf5a39b AC |
3587 | Generate_Reference |
3588 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 3589 | Install_Formals (Body_Id); |
e949ee22 | 3590 | |
4a854847 | 3591 | Push_Scope (Body_Id); |
996ae0b0 | 3592 | end if; |
dbe36d67 AC |
3593 | |
3594 | -- For stubs and bodies with no previous spec, generate references to | |
3595 | -- formals. | |
3596 | ||
3597 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
3598 | end if; |
3599 | ||
5216b599 AC |
3600 | -- Set SPARK_Mode from context |
3601 | ||
3602 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); | |
3603 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
3604 | ||
76a69663 ES |
3605 | -- If the return type is an anonymous access type whose designated type |
3606 | -- is the limited view of a class-wide type and the non-limited view is | |
3607 | -- available, update the return type accordingly. | |
ec4867fa | 3608 | |
8fde064e | 3609 | if Ada_Version >= Ada_2005 and then Comes_From_Source (N) then |
ec4867fa | 3610 | declare |
ec4867fa | 3611 | Etyp : Entity_Id; |
0a36105d | 3612 | Rtyp : Entity_Id; |
ec4867fa ES |
3613 | |
3614 | begin | |
0a36105d JM |
3615 | Rtyp := Etype (Current_Scope); |
3616 | ||
3617 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
3618 | Etyp := Directly_Designated_Type (Rtyp); | |
3619 | ||
7b56a91b AC |
3620 | if Is_Class_Wide_Type (Etyp) |
3621 | and then From_Limited_With (Etyp) | |
3622 | then | |
0a36105d JM |
3623 | Set_Directly_Designated_Type |
3624 | (Etype (Current_Scope), Available_View (Etyp)); | |
3625 | end if; | |
3626 | end if; | |
ec4867fa ES |
3627 | end; |
3628 | end if; | |
3629 | ||
996ae0b0 RK |
3630 | -- If this is the proper body of a stub, we must verify that the stub |
3631 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 3632 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
3633 | -- only required for subprograms that come from source. |
3634 | ||
3635 | if Nkind (Parent (N)) = N_Subunit | |
3636 | and then Comes_From_Source (N) | |
3637 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
3638 | and then Nkind (Corresponding_Stub (Parent (N))) = |
3639 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
3640 | then |
3641 | declare | |
fbf5a39b AC |
3642 | Old_Id : constant Entity_Id := |
3643 | Defining_Entity | |
3644 | (Specification (Corresponding_Stub (Parent (N)))); | |
3645 | ||
996ae0b0 | 3646 | Conformant : Boolean := False; |
996ae0b0 RK |
3647 | |
3648 | begin | |
3649 | if No (Spec_Id) then | |
3650 | Check_Fully_Conformant (Body_Id, Old_Id); | |
3651 | ||
3652 | else | |
3653 | Check_Conformance | |
3654 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
3655 | ||
3656 | if not Conformant then | |
3657 | ||
dbe36d67 AC |
3658 | -- The stub was taken to be a new declaration. Indicate that |
3659 | -- it lacks a body. | |
996ae0b0 RK |
3660 | |
3661 | Set_Has_Completion (Old_Id, False); | |
3662 | end if; | |
3663 | end if; | |
3664 | end; | |
3665 | end if; | |
3666 | ||
3667 | Set_Has_Completion (Body_Id); | |
3668 | Check_Eliminated (Body_Id); | |
3669 | ||
3670 | if Nkind (N) = N_Subprogram_Body_Stub then | |
c8a3028c AC |
3671 | |
3672 | -- Analyze any aspect specifications that appear on the subprogram | |
3673 | -- body stub. | |
3674 | ||
3675 | if Has_Aspects (N) then | |
3676 | Analyze_Aspects_On_Body_Or_Stub; | |
3677 | end if; | |
3678 | ||
3679 | -- Stop the analysis now as the stub cannot be inlined, plus it does | |
3680 | -- not have declarative or statement lists. | |
3681 | ||
996ae0b0 | 3682 | return; |
84f4072a | 3683 | end if; |
996ae0b0 | 3684 | |
b94b6c56 | 3685 | -- Handle frontend inlining |
84f4072a | 3686 | |
b94b6c56 RD |
3687 | -- Note: Normally we don't do any inlining if expansion is off, since |
3688 | -- we won't generate code in any case. An exception arises in GNATprove | |
2d180af1 YM |
3689 | -- mode where we want to expand some calls in place, even with expansion |
3690 | -- disabled, since the inlining eases formal verification. | |
ecad37f3 | 3691 | |
6c26bac2 AC |
3692 | if not GNATprove_Mode |
3693 | and then Expander_Active | |
3694 | and then Serious_Errors_Detected = 0 | |
3695 | and then Present (Spec_Id) | |
3696 | and then Has_Pragma_Inline (Spec_Id) | |
3697 | then | |
3698 | -- Legacy implementation (relying on frontend inlining) | |
84f4072a | 3699 | |
6c26bac2 | 3700 | if not Back_End_Inlining then |
17ce1f52 AC |
3701 | if (Has_Pragma_Inline_Always (Spec_Id) |
3702 | and then not Opt.Disable_FE_Inline_Always) | |
3703 | or else | |
3704 | (Has_Pragma_Inline (Spec_Id) and then Front_End_Inlining | |
3705 | and then not Opt.Disable_FE_Inline) | |
6c26bac2 AC |
3706 | then |
3707 | Build_Body_To_Inline (N, Spec_Id); | |
3708 | end if; | |
f087ea44 | 3709 | |
88f7d2d1 | 3710 | -- New implementation (relying on backend inlining) |
f087ea44 | 3711 | |
6c26bac2 AC |
3712 | else |
3713 | if Has_Pragma_Inline_Always (Spec_Id) | |
3714 | or else Optimization_Level > 0 | |
3715 | then | |
3716 | -- Handle function returning an unconstrained type | |
f087ea44 | 3717 | |
6c26bac2 AC |
3718 | if Comes_From_Source (Body_Id) |
3719 | and then Ekind (Spec_Id) = E_Function | |
3720 | and then Returns_Unconstrained_Type (Spec_Id) | |
5c5e108f AC |
3721 | |
3722 | -- If function builds in place, i.e. returns a limited type, | |
3723 | -- inlining cannot be done. | |
3724 | ||
3725 | and then not Is_Limited_Type (Etype (Spec_Id)) | |
6c26bac2 | 3726 | then |
16b10ccc | 3727 | Check_And_Split_Unconstrained_Function (N, Spec_Id, Body_Id); |
84f4072a | 3728 | |
6c26bac2 AC |
3729 | else |
3730 | declare | |
b80a2b4b AC |
3731 | Subp_Body : constant Node_Id := |
3732 | Unit_Declaration_Node (Body_Id); | |
6c26bac2 | 3733 | Subp_Decl : constant List_Id := Declarations (Subp_Body); |
84f4072a | 3734 | |
6c26bac2 AC |
3735 | begin |
3736 | -- Do not pass inlining to the backend if the subprogram | |
3737 | -- has declarations or statements which cannot be inlined | |
3738 | -- by the backend. This check is done here to emit an | |
3739 | -- error instead of the generic warning message reported | |
3740 | -- by the GCC backend (ie. "function might not be | |
3741 | -- inlinable"). | |
3742 | ||
3743 | if Present (Subp_Decl) | |
3744 | and then Has_Excluded_Declaration (Spec_Id, Subp_Decl) | |
3745 | then | |
3746 | null; | |
3747 | ||
3748 | elsif Has_Excluded_Statement | |
3749 | (Spec_Id, | |
3750 | Statements | |
3751 | (Handled_Statement_Sequence (Subp_Body))) | |
3752 | then | |
3753 | null; | |
3754 | ||
3755 | -- If the backend inlining is available then at this | |
3756 | -- stage we only have to mark the subprogram as inlined. | |
3757 | -- The expander will take care of registering it in the | |
3758 | -- table of subprograms inlined by the backend a part of | |
3759 | -- processing calls to it (cf. Expand_Call) | |
3760 | ||
3761 | else | |
3762 | Set_Is_Inlined (Spec_Id); | |
3763 | end if; | |
3764 | end; | |
3765 | end if; | |
3766 | end if; | |
3767 | end if; | |
2d180af1 YM |
3768 | |
3769 | -- In GNATprove mode, inline only when there is a separate subprogram | |
3770 | -- declaration for now, as inlining of subprogram bodies acting as | |
3771 | -- declarations, or subprogram stubs, are not supported by frontend | |
3772 | -- inlining. This inlining should occur after analysis of the body, so | |
3773 | -- that it is known whether the value of SPARK_Mode applicable to the | |
3774 | -- body, which can be defined by a pragma inside the body. | |
3775 | ||
3776 | elsif GNATprove_Mode | |
2d180af1 YM |
3777 | and then Full_Analysis |
3778 | and then not Inside_A_Generic | |
3779 | and then Present (Spec_Id) | |
3780 | and then Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Declaration | |
3781 | and then Can_Be_Inlined_In_GNATprove_Mode (Spec_Id, Body_Id) | |
ac072cb2 | 3782 | and then not Body_Has_Contract |
2d180af1 | 3783 | then |
6c26bac2 | 3784 | Build_Body_To_Inline (N, Spec_Id); |
996ae0b0 RK |
3785 | end if; |
3786 | ||
0ab80019 | 3787 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 3788 | -- of the specification we have to install the private withed units. |
21d27997 | 3789 | -- This holds for child units as well. |
9bc856dd AC |
3790 | |
3791 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 3792 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
3793 | then |
3794 | Install_Private_With_Clauses (Body_Id); | |
3795 | end if; | |
3796 | ||
ec4867fa ES |
3797 | Check_Anonymous_Return; |
3798 | ||
fdce4bb7 JM |
3799 | -- Set the Protected_Formal field of each extra formal of the protected |
3800 | -- subprogram to reference the corresponding extra formal of the | |
3801 | -- subprogram that implements it. For regular formals this occurs when | |
3802 | -- the protected subprogram's declaration is expanded, but the extra | |
3803 | -- formals don't get created until the subprogram is frozen. We need to | |
3804 | -- do this before analyzing the protected subprogram's body so that any | |
3805 | -- references to the original subprogram's extra formals will be changed | |
3806 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
3807 | ||
3808 | if Present (Spec_Id) | |
3809 | and then Is_Protected_Type (Scope (Spec_Id)) | |
3810 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
3811 | then | |
3812 | declare | |
3813 | Impl_Subp : constant Entity_Id := | |
3814 | Protected_Body_Subprogram (Spec_Id); | |
3815 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
3816 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
3817 | begin |
3818 | while Present (Prot_Ext_Formal) loop | |
3819 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 3820 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
3821 | Next_Formal_With_Extras (Prot_Ext_Formal); |
3822 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
3823 | end loop; | |
3824 | end; | |
3825 | end if; | |
3826 | ||
0868e09c | 3827 | -- Now we can go on to analyze the body |
996ae0b0 RK |
3828 | |
3829 | HSS := Handled_Statement_Sequence (N); | |
3830 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 3831 | |
f3d0f304 | 3832 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
3833 | -- for discriminals and privals and finally a declaration for the entry |
3834 | -- family index (if applicable). This form of early expansion is done | |
3835 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 | 3836 | -- references entities which were created during regular expansion. The |
3b8056a5 AC |
3837 | -- subprogram entity must come from source, and not be an internally |
3838 | -- generated subprogram. | |
21d27997 | 3839 | |
4460a9bc | 3840 | if Expander_Active |
21d27997 RD |
3841 | and then Present (Prot_Typ) |
3842 | and then Present (Spec_Id) | |
3b8056a5 | 3843 | and then Comes_From_Source (Spec_Id) |
21d27997 RD |
3844 | and then not Is_Eliminated (Spec_Id) |
3845 | then | |
3846 | Install_Private_Data_Declarations | |
3847 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
3848 | end if; | |
3849 | ||
5dcab3ca AC |
3850 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
3851 | -- may now appear in parameter and result profiles. Since the analysis | |
3852 | -- of a subprogram body may use the parameter and result profile of the | |
3853 | -- spec, swap any limited views with their non-limited counterpart. | |
3854 | ||
3855 | if Ada_Version >= Ada_2012 then | |
3856 | Exchange_Limited_Views (Spec_Id); | |
3857 | end if; | |
3858 | ||
c8a3028c AC |
3859 | -- Analyze any aspect specifications that appear on the subprogram body |
3860 | ||
3861 | if Has_Aspects (N) then | |
3862 | Analyze_Aspects_On_Body_Or_Stub; | |
3863 | end if; | |
3864 | ||
996ae0b0 | 3865 | Analyze_Declarations (Declarations (N)); |
21d27997 | 3866 | |
f3124d8f | 3867 | -- Verify that the SPARK_Mode of the body agrees with that of its spec |
f90d14ac | 3868 | |
f1c7be38 | 3869 | if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then |
f90d14ac AC |
3870 | if Present (SPARK_Pragma (Spec_Id)) then |
3871 | if Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Spec_Id)) = Off | |
3872 | and then | |
3873 | Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Body_Id)) = On | |
3874 | then | |
3875 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3876 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3877 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); | |
3878 | Error_Msg_NE | |
f3124d8f | 3879 | ("\value Off was set for SPARK_Mode on & #", N, Spec_Id); |
f90d14ac AC |
3880 | end if; |
3881 | ||
3882 | elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then | |
3883 | null; | |
3884 | ||
3885 | else | |
3886 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3ccedacc | 3887 | Error_Msg_N ("incorrect application of SPARK_Mode #", N); |
f90d14ac | 3888 | Error_Msg_Sloc := Sloc (Spec_Id); |
f3124d8f HK |
3889 | Error_Msg_NE |
3890 | ("\no value was set for SPARK_Mode on & #", N, Spec_Id); | |
f90d14ac AC |
3891 | end if; |
3892 | end if; | |
3893 | ||
c9d70ab1 AC |
3894 | -- When a subprogram body appears inside a package, its contract is |
3895 | -- analyzed at the end of the package body declarations. This is due | |
3896 | -- to the delay with respect of the package contract upon which the | |
3897 | -- body contract may depend. When the subprogram body is stand alone | |
3898 | -- and acts as a compilation unit, this delay is not necessary. | |
3899 | ||
3900 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
3901 | Analyze_Subprogram_Body_Contract (Body_Id); | |
3902 | end if; | |
3903 | ||
3904 | -- Deal with preconditions, [refined] postconditions, Contract_Cases, | |
3905 | -- invariants and predicates associated with body and its spec. Since | |
3906 | -- there is no routine Expand_Declarations which would otherwise deal | |
3907 | -- with the contract expansion, generate all necessary mechanisms to | |
3908 | -- verify the contract assertions now. | |
3909 | ||
3910 | Expand_Subprogram_Contract (N); | |
3911 | ||
ac43e11e AC |
3912 | -- If SPARK_Mode for body is not On, disable frontend inlining for this |
3913 | -- subprogram in GNATprove mode, as its body should not be analyzed. | |
3914 | ||
3915 | if SPARK_Mode /= On | |
3916 | and then GNATprove_Mode | |
ac43e11e AC |
3917 | and then Present (Spec_Id) |
3918 | and then Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Declaration | |
3919 | then | |
3920 | Set_Body_To_Inline (Parent (Parent (Spec_Id)), Empty); | |
4bd4bb7f | 3921 | Set_Is_Inlined_Always (Spec_Id, False); |
ac43e11e AC |
3922 | end if; |
3923 | ||
21d27997 RD |
3924 | -- Check completion, and analyze the statements |
3925 | ||
996ae0b0 | 3926 | Check_Completion; |
33931112 | 3927 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 3928 | Analyze (HSS); |
21d27997 RD |
3929 | |
3930 | -- Deal with end of scope processing for the body | |
3931 | ||
07fc65c4 | 3932 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
3933 | End_Scope; |
3934 | Check_Subprogram_Order (N); | |
c37bb106 | 3935 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
3936 | |
3937 | -- If we have a separate spec, then the analysis of the declarations | |
3938 | -- caused the entities in the body to be chained to the spec id, but | |
3939 | -- we want them chained to the body id. Only the formal parameters | |
3940 | -- end up chained to the spec id in this case. | |
3941 | ||
3942 | if Present (Spec_Id) then | |
3943 | ||
d39d6bb8 | 3944 | -- We must conform to the categorization of our spec |
996ae0b0 | 3945 | |
d39d6bb8 | 3946 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 3947 | |
d39d6bb8 RD |
3948 | -- And if this is a child unit, the parent units must conform |
3949 | ||
3950 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
3951 | Validate_Categorization_Dependency |
3952 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
3953 | end if; | |
3954 | ||
21d27997 RD |
3955 | -- Here is where we move entities from the spec to the body |
3956 | ||
3957 | -- Case where there are entities that stay with the spec | |
3958 | ||
3959 | if Present (Last_Real_Spec_Entity) then | |
3960 | ||
dbe36d67 AC |
3961 | -- No body entities (happens when the only real spec entities come |
3962 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
3963 | |
3964 | if No (Last_Entity (Body_Id)) then | |
3965 | Set_First_Entity | |
3966 | (Body_Id, Next_Entity (Last_Real_Spec_Entity)); | |
3967 | ||
3968 | -- Body entities present (formals), so chain stuff past them | |
3969 | ||
3970 | else | |
3971 | Set_Next_Entity | |
3972 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
3973 | end if; | |
3974 | ||
3975 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 3976 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
3977 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
3978 | ||
dbe36d67 AC |
3979 | -- Case where there are no spec entities, in this case there can be |
3980 | -- no body entities either, so just move everything. | |
996ae0b0 | 3981 | |
a921e83c AC |
3982 | -- If the body is generated for an expression function, it may have |
3983 | -- been preanalyzed already, if 'access was applied to it. | |
3984 | ||
996ae0b0 | 3985 | else |
a921e83c AC |
3986 | if Nkind (Original_Node (Unit_Declaration_Node (Spec_Id))) /= |
3987 | N_Expression_Function | |
3988 | then | |
3989 | pragma Assert (No (Last_Entity (Body_Id))); | |
3990 | null; | |
3991 | end if; | |
3992 | ||
996ae0b0 RK |
3993 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
3994 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
3995 | Set_First_Entity (Spec_Id, Empty); | |
3996 | Set_Last_Entity (Spec_Id, Empty); | |
3997 | end if; | |
3998 | end if; | |
3999 | ||
7665e4bd | 4000 | Check_Missing_Return; |
996ae0b0 | 4001 | |
82c80734 | 4002 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
4003 | -- the body of the procedure. But first we deal with a special case |
4004 | -- where we want to modify this check. If the body of the subprogram | |
4005 | -- starts with a raise statement or its equivalent, or if the body | |
cf3e6845 AC |
4006 | -- consists entirely of a null statement, then it is pretty obvious that |
4007 | -- it is OK to not reference the parameters. For example, this might be | |
4008 | -- the following common idiom for a stubbed function: statement of the | |
4009 | -- procedure raises an exception. In particular this deals with the | |
4010 | -- common idiom of a stubbed function, which appears something like: | |
fbf5a39b AC |
4011 | |
4012 | -- function F (A : Integer) return Some_Type; | |
4013 | -- X : Some_Type; | |
4014 | -- begin | |
4015 | -- raise Program_Error; | |
4016 | -- return X; | |
4017 | -- end F; | |
4018 | ||
76a69663 ES |
4019 | -- Here the purpose of X is simply to satisfy the annoying requirement |
4020 | -- in Ada that there be at least one return, and we certainly do not | |
a90bd866 | 4021 | -- want to go posting warnings on X that it is not initialized. On |
76a69663 ES |
4022 | -- the other hand, if X is entirely unreferenced that should still |
4023 | -- get a warning. | |
4024 | ||
4025 | -- What we do is to detect these cases, and if we find them, flag the | |
4026 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
4027 | -- suppress unwanted warnings. For the case of the function stub above | |
4028 | -- we have a special test to set X as apparently assigned to suppress | |
4029 | -- the warning. | |
996ae0b0 RK |
4030 | |
4031 | declare | |
800621e0 | 4032 | Stm : Node_Id; |
996ae0b0 RK |
4033 | |
4034 | begin | |
0a36105d JM |
4035 | -- Skip initial labels (for one thing this occurs when we are in |
4036 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
4037 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 4038 | |
800621e0 | 4039 | Stm := First (Statements (HSS)); |
0a36105d JM |
4040 | while Nkind (Stm) = N_Label |
4041 | or else Nkind (Stm) in N_Push_xxx_Label | |
4042 | loop | |
996ae0b0 | 4043 | Next (Stm); |
0a36105d | 4044 | end loop; |
996ae0b0 | 4045 | |
fbf5a39b AC |
4046 | -- Do the test on the original statement before expansion |
4047 | ||
4048 | declare | |
4049 | Ostm : constant Node_Id := Original_Node (Stm); | |
4050 | ||
4051 | begin | |
76a69663 | 4052 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
4053 | |
4054 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
4055 | Set_Trivial_Subprogram (Stm); |
4056 | ||
f3d57416 | 4057 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
4058 | |
4059 | elsif Nkind (Stm) = N_Null_Statement | |
4060 | and then Comes_From_Source (Stm) | |
4061 | and then No (Next (Stm)) | |
4062 | then | |
4063 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
4064 | |
4065 | -- Check for explicit call cases which likely raise an exception | |
4066 | ||
4067 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
4068 | if Is_Entity_Name (Name (Ostm)) then | |
4069 | declare | |
4070 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
4071 | ||
4072 | begin | |
4073 | -- If the procedure is marked No_Return, then likely it | |
4074 | -- raises an exception, but in any case it is not coming | |
76a69663 | 4075 | -- back here, so turn on the flag. |
fbf5a39b | 4076 | |
f46faa08 AC |
4077 | if Present (Ent) |
4078 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
4079 | and then No_Return (Ent) |
4080 | then | |
76a69663 | 4081 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
4082 | end if; |
4083 | end; | |
4084 | end if; | |
4085 | end if; | |
4086 | end; | |
996ae0b0 RK |
4087 | end; |
4088 | ||
4089 | -- Check for variables that are never modified | |
4090 | ||
4091 | declare | |
4092 | E1, E2 : Entity_Id; | |
4093 | ||
4094 | begin | |
fbf5a39b | 4095 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
4096 | -- flags from out parameters to the corresponding entities in the |
4097 | -- body. The reason we do that is we want to post error flags on | |
4098 | -- the body entities, not the spec entities. | |
4099 | ||
4100 | if Present (Spec_Id) then | |
4101 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
4102 | while Present (E1) loop |
4103 | if Ekind (E1) = E_Out_Parameter then | |
4104 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 4105 | while Present (E2) loop |
996ae0b0 RK |
4106 | exit when Chars (E1) = Chars (E2); |
4107 | Next_Entity (E2); | |
4108 | end loop; | |
4109 | ||
fbf5a39b AC |
4110 | if Present (E2) then |
4111 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
4112 | end if; | |
996ae0b0 RK |
4113 | end if; |
4114 | ||
4115 | Next_Entity (E1); | |
4116 | end loop; | |
4117 | end if; | |
4118 | ||
2aca76d6 | 4119 | -- Check references in body |
0868e09c | 4120 | |
2aca76d6 | 4121 | Check_References (Body_Id); |
996ae0b0 | 4122 | end; |
5a271a7f RD |
4123 | |
4124 | -- Check for nested subprogram, and mark outer level subprogram if so | |
4125 | ||
4126 | declare | |
4127 | Ent : Entity_Id; | |
4128 | ||
4129 | begin | |
4130 | if Present (Spec_Id) then | |
4131 | Ent := Spec_Id; | |
4132 | else | |
4133 | Ent := Body_Id; | |
4134 | end if; | |
4135 | ||
4136 | loop | |
4137 | Ent := Enclosing_Subprogram (Ent); | |
4138 | exit when No (Ent) or else Is_Subprogram (Ent); | |
4139 | end loop; | |
4140 | ||
4141 | if Present (Ent) then | |
4142 | Set_Has_Nested_Subprogram (Ent); | |
4143 | end if; | |
4144 | end; | |
b1b543d2 | 4145 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 | 4146 | |
5afe5d2d HK |
4147 | --------------------------------- |
4148 | -- Analyze_Subprogram_Contract -- | |
4149 | --------------------------------- | |
4150 | ||
c9d70ab1 AC |
4151 | procedure Analyze_Subprogram_Contract (Subp_Id : Entity_Id) is |
4152 | procedure Save_Global_References_In_List (First_Prag : Node_Id); | |
4153 | -- Save all global references in contract-related source pragma found in | |
4154 | -- the list starting from pragma First_Prag. | |
4155 | ||
4156 | ------------------------------------ | |
4157 | -- Save_Global_References_In_List -- | |
4158 | ------------------------------------ | |
4159 | ||
4160 | procedure Save_Global_References_In_List (First_Prag : Node_Id) is | |
4161 | Prag : Node_Id; | |
4162 | ||
4163 | begin | |
4164 | Prag := First_Prag; | |
4165 | while Present (Prag) loop | |
4166 | if Comes_From_Source (Prag) | |
4167 | and then Nam_In (Pragma_Name (Prag), Name_Contract_Cases, | |
4168 | Name_Depends, | |
4169 | Name_Extensions_Visible, | |
4170 | Name_Global, | |
4171 | Name_Postcondition, | |
4172 | Name_Precondition, | |
4173 | Name_Test_Case) | |
4174 | then | |
4175 | Save_Global_References (Original_Node (Prag)); | |
4176 | end if; | |
4177 | ||
4178 | Prag := Next_Pragma (Prag); | |
4179 | end loop; | |
4180 | end Save_Global_References_In_List; | |
4181 | ||
4182 | -- Local variables | |
4183 | ||
4184 | Items : constant Node_Id := Contract (Subp_Id); | |
4185 | Subp_Decl : constant Node_Id := Unit_Declaration_Node (Subp_Id); | |
4186 | Depends : Node_Id := Empty; | |
4187 | Global : Node_Id := Empty; | |
4188 | Mode : SPARK_Mode_Type; | |
4189 | Prag : Node_Id; | |
4190 | Prag_Nam : Name_Id; | |
4191 | Restore_Scope : Boolean := False; | |
4192 | ||
4193 | -- Start of processing for Analyze_Subprogram_Contract | |
5afe5d2d HK |
4194 | |
4195 | begin | |
c9d70ab1 AC |
4196 | -- All subprograms carry a contract, but for some it is not significant |
4197 | -- and should not be processed. | |
4198 | ||
4199 | if not Has_Significant_Contract (Subp_Id) then | |
4200 | return; | |
4201 | end if; | |
4202 | ||
fc999c5d RD |
4203 | -- Due to the timing of contract analysis, delayed pragmas may be |
4204 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
4205 | -- context. To remedy this, restore the original SPARK_Mode of the | |
4206 | -- related subprogram body. | |
4207 | ||
c9d70ab1 AC |
4208 | Save_SPARK_Mode_And_Set (Subp_Id, Mode); |
4209 | ||
4210 | -- Ensure that the formal parameters are visible when analyzing all | |
4211 | -- contract items. | |
4212 | ||
4213 | if not In_Open_Scopes (Subp_Id) then | |
4214 | Restore_Scope := True; | |
4215 | Push_Scope (Subp_Id); | |
4216 | ||
4217 | if Is_Generic_Subprogram (Subp_Id) then | |
4218 | Install_Generic_Formals (Subp_Id); | |
4219 | else | |
4220 | Install_Formals (Subp_Id); | |
4221 | end if; | |
4222 | end if; | |
c61ef416 | 4223 | |
5afe5d2d HK |
4224 | if Present (Items) then |
4225 | ||
4226 | -- Analyze pre- and postconditions | |
4227 | ||
4228 | Prag := Pre_Post_Conditions (Items); | |
4229 | while Present (Prag) loop | |
c9d70ab1 | 4230 | Analyze_Pre_Post_Condition_In_Decl_Part (Prag); |
5afe5d2d HK |
4231 | Prag := Next_Pragma (Prag); |
4232 | end loop; | |
4233 | ||
4234 | -- Analyze contract-cases and test-cases | |
4235 | ||
4236 | Prag := Contract_Test_Cases (Items); | |
4237 | while Present (Prag) loop | |
c9d70ab1 | 4238 | Prag_Nam := Pragma_Name (Prag); |
ea3c0651 | 4239 | |
c9d70ab1 | 4240 | if Prag_Nam = Name_Contract_Cases then |
5afe5d2d | 4241 | Analyze_Contract_Cases_In_Decl_Part (Prag); |
5afe5d2d | 4242 | else |
c9d70ab1 AC |
4243 | pragma Assert (Prag_Nam = Name_Test_Case); |
4244 | Analyze_Test_Case_In_Decl_Part (Prag); | |
5afe5d2d HK |
4245 | end if; |
4246 | ||
4247 | Prag := Next_Pragma (Prag); | |
4248 | end loop; | |
4249 | ||
4250 | -- Analyze classification pragmas | |
4251 | ||
6c3c671e | 4252 | Prag := Classifications (Items); |
5afe5d2d | 4253 | while Present (Prag) loop |
c9d70ab1 | 4254 | Prag_Nam := Pragma_Name (Prag); |
ea3c0651 | 4255 | |
c9d70ab1 | 4256 | if Prag_Nam = Name_Depends then |
54e28df2 | 4257 | Depends := Prag; |
039538bc | 4258 | |
c9d70ab1 | 4259 | elsif Prag_Nam = Name_Global then |
54e28df2 | 4260 | Global := Prag; |
039538bc AC |
4261 | |
4262 | -- Note that pragma Extensions_Visible has already been analyzed | |
4263 | ||
5afe5d2d HK |
4264 | end if; |
4265 | ||
4266 | Prag := Next_Pragma (Prag); | |
4267 | end loop; | |
54e28df2 HK |
4268 | |
4269 | -- Analyze Global first as Depends may mention items classified in | |
4270 | -- the global categorization. | |
4271 | ||
4272 | if Present (Global) then | |
4273 | Analyze_Global_In_Decl_Part (Global); | |
4274 | end if; | |
4275 | ||
4276 | -- Depends must be analyzed after Global in order to see the modes of | |
4277 | -- all global items. | |
4278 | ||
4279 | if Present (Depends) then | |
4280 | Analyze_Depends_In_Decl_Part (Depends); | |
4281 | end if; | |
5afe5d2d | 4282 | |
c9d70ab1 AC |
4283 | -- Ensure that the contract cases or postconditions mention 'Result |
4284 | -- or define a post-state. | |
5afe5d2d | 4285 | |
c9d70ab1 AC |
4286 | Check_Result_And_Post_State (Subp_Id); |
4287 | end if; | |
5afe5d2d | 4288 | |
c9d70ab1 AC |
4289 | -- The aspects and contract-related source pragmas associated with a |
4290 | -- generic subprogram are treated separately from the declaration as | |
4291 | -- they need to be analyzed when the subprogram contract is analyzed. | |
4292 | -- Once this is done, global references can be successfully saved. | |
5afe5d2d | 4293 | |
c9d70ab1 | 4294 | if Nkind (Subp_Decl) = N_Generic_Subprogram_Declaration then |
f660fba6 | 4295 | |
c9d70ab1 AC |
4296 | -- Save all global references found in the aspect specifications of |
4297 | -- the parameter profile of the generic subprogram. | |
f660fba6 | 4298 | |
c9d70ab1 | 4299 | Save_Global_References_In_Aspects (Original_Node (Subp_Decl)); |
f660fba6 | 4300 | |
c9d70ab1 AC |
4301 | -- Save all global references found in contract-related source |
4302 | -- pragmas. These pragmas usually appear after the declaration of | |
4303 | -- the generic subprogram, either in the same declarative part or | |
4304 | -- in the Pragmas_After list when the generic subprogram is a | |
4305 | -- compilation unit. | |
4306 | ||
4307 | if Present (Items) then | |
4308 | Save_Global_References_In_List (Pre_Post_Conditions (Items)); | |
4309 | Save_Global_References_In_List (Contract_Test_Cases (Items)); | |
4310 | Save_Global_References_In_List (Classifications (Items)); | |
5afe5d2d HK |
4311 | end if; |
4312 | end if; | |
c61ef416 | 4313 | |
c9d70ab1 AC |
4314 | if Restore_Scope then |
4315 | End_Scope; | |
4316 | end if; | |
4317 | ||
fc999c5d RD |
4318 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
4319 | -- pragmas have been analyzed. | |
4320 | ||
c61ef416 | 4321 | Restore_SPARK_Mode (Mode); |
5afe5d2d HK |
4322 | end Analyze_Subprogram_Contract; |
4323 | ||
996ae0b0 RK |
4324 | ------------------------------------ |
4325 | -- Analyze_Subprogram_Declaration -- | |
4326 | ------------------------------------ | |
4327 | ||
4328 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
579847c2 | 4329 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc | 4330 | Designator : Entity_Id; |
579847c2 | 4331 | |
4d8f3296 ES |
4332 | Is_Completion : Boolean; |
4333 | -- Indicates whether a null procedure declaration is a completion | |
996ae0b0 RK |
4334 | |
4335 | begin | |
8636f52f HK |
4336 | -- The subprogram declaration may be subject to pragma Ghost with policy |
4337 | -- Ignore. Set the mode now to ensure that any nodes generated during | |
4338 | -- analysis and expansion are properly flagged as ignored Ghost. | |
4339 | ||
4340 | Set_Ghost_Mode (N); | |
4341 | ||
2ba431e5 | 4342 | -- Null procedures are not allowed in SPARK |
daec8eeb | 4343 | |
fe5d3068 | 4344 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
4345 | and then Null_Present (Specification (N)) |
4346 | then | |
ce5ba43a | 4347 | Check_SPARK_05_Restriction ("null procedure is not allowed", N); |
718deaf1 | 4348 | |
b741083a ES |
4349 | -- Null procedures are allowed in protected types, following |
4350 | -- the recent AI12-0147. | |
4351 | ||
4352 | if Is_Protected_Type (Current_Scope) | |
4353 | and then Ada_Version < Ada_2012 | |
4354 | then | |
4d8f3296 ES |
4355 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
4356 | end if; | |
718deaf1 | 4357 | |
4d8f3296 | 4358 | Analyze_Null_Procedure (N, Is_Completion); |
718deaf1 | 4359 | |
4d8f3296 | 4360 | if Is_Completion then |
718deaf1 | 4361 | |
4d8f3296 | 4362 | -- The null procedure acts as a body, nothing further is needed. |
5d5832bc | 4363 | |
4d8f3296 | 4364 | return; |
5d5832bc AC |
4365 | end if; |
4366 | end if; | |
4367 | ||
beacce02 | 4368 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
4369 | |
4370 | -- A reference may already have been generated for the unit name, in | |
4371 | -- which case the following call is redundant. However it is needed for | |
4372 | -- declarations that are the rewriting of an expression function. | |
4373 | ||
5d5832bc AC |
4374 | Generate_Definition (Designator); |
4375 | ||
f90d14ac AC |
4376 | -- Set SPARK mode from current context (may be overwritten later with |
4377 | -- explicit pragma). | |
4a854847 | 4378 | |
f90d14ac | 4379 | Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
8636f52f | 4380 | Set_SPARK_Pragma_Inherited (Designator); |
579847c2 | 4381 | |
8636f52f | 4382 | -- A subprogram declared within a Ghost region is automatically Ghost |
c5cec2fe AC |
4383 | -- (SPARK RM 6.9(2)). |
4384 | ||
8636f52f | 4385 | if Comes_From_Source (Designator) and then Ghost_Mode > None then |
c5cec2fe AC |
4386 | Set_Is_Ghost_Entity (Designator); |
4387 | end if; | |
4388 | ||
b1b543d2 BD |
4389 | if Debug_Flag_C then |
4390 | Write_Str ("==> subprogram spec "); | |
4391 | Write_Name (Chars (Designator)); | |
4392 | Write_Str (" from "); | |
4393 | Write_Location (Sloc (N)); | |
4394 | Write_Eol; | |
4395 | Indent; | |
4396 | end if; | |
4397 | ||
996ae0b0 | 4398 | Validate_RCI_Subprogram_Declaration (N); |
996ae0b0 RK |
4399 | New_Overloaded_Entity (Designator); |
4400 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 4401 | |
cf3e6845 AC |
4402 | -- If the type of the first formal of the current subprogram is a non- |
4403 | -- generic tagged private type, mark the subprogram as being a private | |
4404 | -- primitive. Ditto if this is a function with controlling result, and | |
4405 | -- the return type is currently private. In both cases, the type of the | |
4406 | -- controlling argument or result must be in the current scope for the | |
4407 | -- operation to be primitive. | |
6ca063eb AC |
4408 | |
4409 | if Has_Controlling_Result (Designator) | |
4410 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 4411 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
4412 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
4413 | then | |
4414 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 4415 | |
6ca063eb | 4416 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
4417 | declare |
4418 | Formal_Typ : constant Entity_Id := | |
4419 | Etype (First_Formal (Designator)); | |
4420 | begin | |
4421 | Set_Is_Private_Primitive (Designator, | |
4422 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 4423 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
4424 | and then Is_Private_Type (Formal_Typ) |
4425 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
4426 | end; | |
4427 | end if; | |
4428 | ||
ec4867fa ES |
4429 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
4430 | -- or null. | |
4431 | ||
0791fbe9 | 4432 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
4433 | and then Comes_From_Source (N) |
4434 | and then Is_Dispatching_Operation (Designator) | |
4435 | then | |
4436 | declare | |
4437 | E : Entity_Id; | |
4438 | Etyp : Entity_Id; | |
4439 | ||
4440 | begin | |
4441 | if Has_Controlling_Result (Designator) then | |
4442 | Etyp := Etype (Designator); | |
4443 | ||
4444 | else | |
4445 | E := First_Entity (Designator); | |
4446 | while Present (E) | |
4447 | and then Is_Formal (E) | |
4448 | and then not Is_Controlling_Formal (E) | |
4449 | loop | |
4450 | Next_Entity (E); | |
4451 | end loop; | |
4452 | ||
4453 | Etyp := Etype (E); | |
4454 | end if; | |
4455 | ||
4456 | if Is_Access_Type (Etyp) then | |
4457 | Etyp := Directly_Designated_Type (Etyp); | |
4458 | end if; | |
4459 | ||
4460 | if Is_Interface (Etyp) | |
f937473f | 4461 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa | 4462 | and then not (Ekind (Designator) = E_Procedure |
8fde064e | 4463 | and then Null_Present (Specification (N))) |
ec4867fa ES |
4464 | then |
4465 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
4466 | |
4467 | -- Specialize error message based on procedures vs. functions, | |
4468 | -- since functions can't be null subprograms. | |
4469 | ||
4470 | if Ekind (Designator) = E_Procedure then | |
4471 | Error_Msg_N | |
4472 | ("interface procedure % must be abstract or null", N); | |
4473 | else | |
3f80a182 AC |
4474 | Error_Msg_N |
4475 | ("interface function % must be abstract", N); | |
033eaf85 | 4476 | end if; |
ec4867fa ES |
4477 | end if; |
4478 | end; | |
4479 | end if; | |
4480 | ||
fbf5a39b AC |
4481 | -- What is the following code for, it used to be |
4482 | ||
4483 | -- ??? Set_Suppress_Elaboration_Checks | |
4484 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
4485 | ||
4486 | -- The following seems equivalent, but a bit dubious | |
4487 | ||
4488 | if Elaboration_Checks_Suppressed (Designator) then | |
4489 | Set_Kill_Elaboration_Checks (Designator); | |
4490 | end if; | |
996ae0b0 | 4491 | |
8fde064e | 4492 | if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then |
fbf5a39b | 4493 | Set_Categorization_From_Scope (Designator, Scop); |
8fde064e | 4494 | |
996ae0b0 | 4495 | else |
e895b435 | 4496 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 4497 | |
0a36105d | 4498 | Push_Scope (Designator); |
996ae0b0 RK |
4499 | Set_Categorization_From_Pragmas (N); |
4500 | Validate_Categorization_Dependency (N, Designator); | |
4501 | Pop_Scope; | |
4502 | end if; | |
4503 | ||
4504 | -- For a compilation unit, set body required. This flag will only be | |
4505 | -- reset if a valid Import or Interface pragma is processed later on. | |
4506 | ||
4507 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
4508 | Set_Body_Required (Parent (N), True); | |
758c442c | 4509 | |
0791fbe9 | 4510 | if Ada_Version >= Ada_2005 |
758c442c GD |
4511 | and then Nkind (Specification (N)) = N_Procedure_Specification |
4512 | and then Null_Present (Specification (N)) | |
4513 | then | |
4514 | Error_Msg_N | |
4515 | ("null procedure cannot be declared at library level", N); | |
4516 | end if; | |
996ae0b0 RK |
4517 | end if; |
4518 | ||
fbf5a39b | 4519 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 4520 | Check_Eliminated (Designator); |
fbf5a39b | 4521 | |
b1b543d2 BD |
4522 | if Debug_Flag_C then |
4523 | Outdent; | |
4524 | Write_Str ("<== subprogram spec "); | |
4525 | Write_Name (Chars (Designator)); | |
4526 | Write_Str (" from "); | |
4527 | Write_Location (Sloc (N)); | |
4528 | Write_Eol; | |
4529 | end if; | |
0f1a6a0b | 4530 | |
1a265e78 AC |
4531 | if Is_Protected_Type (Current_Scope) then |
4532 | ||
4533 | -- Indicate that this is a protected operation, because it may be | |
4534 | -- used in subsequent declarations within the protected type. | |
4535 | ||
4536 | Set_Convention (Designator, Convention_Protected); | |
4537 | end if; | |
4538 | ||
beacce02 | 4539 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
4540 | |
4541 | if Has_Aspects (N) then | |
4542 | Analyze_Aspect_Specifications (N, Designator); | |
4543 | end if; | |
996ae0b0 RK |
4544 | end Analyze_Subprogram_Declaration; |
4545 | ||
fbf5a39b AC |
4546 | -------------------------------------- |
4547 | -- Analyze_Subprogram_Specification -- | |
4548 | -------------------------------------- | |
4549 | ||
4550 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
4551 | -- declaration). This procedure is called to analyze the specification in | |
4552 | -- both subprogram bodies and subprogram declarations (specs). | |
4553 | ||
4554 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
4555 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 4556 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 4557 | |
758c442c GD |
4558 | -- Start of processing for Analyze_Subprogram_Specification |
4559 | ||
fbf5a39b | 4560 | begin |
2ba431e5 | 4561 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 4562 | |
db72f10a AC |
4563 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
4564 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
4565 | then | |
ce5ba43a AC |
4566 | Check_SPARK_05_Restriction |
4567 | ("user-defined operator is not allowed", N); | |
38171f43 AC |
4568 | end if; |
4569 | ||
31af8899 AC |
4570 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
4571 | -- specification comes from an expression function, because it may be | |
4572 | -- the completion of a previous declaration. It is is not, the cross- | |
4573 | -- reference entry will be emitted for the new subprogram declaration. | |
4574 | ||
4575 | if Nkind (Parent (N)) /= N_Expression_Function then | |
4576 | Generate_Definition (Designator); | |
4577 | end if; | |
38171f43 | 4578 | |
fbf5a39b AC |
4579 | if Nkind (N) = N_Function_Specification then |
4580 | Set_Ekind (Designator, E_Function); | |
4581 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
4582 | else |
4583 | Set_Ekind (Designator, E_Procedure); | |
4584 | Set_Etype (Designator, Standard_Void_Type); | |
4585 | end if; | |
4586 | ||
4bd4bb7f AC |
4587 | -- Flag Is_Inlined_Always is True by default, and reversed to False for |
4588 | -- those subprograms which could be inlined in GNATprove mode (because | |
4589 | -- Body_To_Inline is non-Empty) but cannot be inlined. | |
4590 | ||
4591 | if GNATprove_Mode then | |
4592 | Set_Is_Inlined_Always (Designator); | |
4593 | end if; | |
4594 | ||
800621e0 | 4595 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
4596 | |
4597 | Set_Scope (Designator, Current_Scope); | |
4598 | ||
fbf5a39b | 4599 | if Present (Formals) then |
0a36105d | 4600 | Push_Scope (Designator); |
fbf5a39b | 4601 | Process_Formals (Formals, N); |
758c442c | 4602 | |
0929eaeb AC |
4603 | -- Check dimensions in N for formals with default expression |
4604 | ||
4605 | Analyze_Dimension_Formals (N, Formals); | |
4606 | ||
a38ff9b1 ES |
4607 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
4608 | -- inherited interface operation, and the controlling type is | |
4609 | -- a synchronized type, replace the type with its corresponding | |
4610 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
4611 | -- Same processing for an access parameter whose designated type is |
4612 | -- derived from a synchronized interface. | |
758c442c | 4613 | |
0791fbe9 | 4614 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
4615 | declare |
4616 | Formal : Entity_Id; | |
4617 | Formal_Typ : Entity_Id; | |
4618 | Rec_Typ : Entity_Id; | |
69cb258c | 4619 | Desig_Typ : Entity_Id; |
0a36105d | 4620 | |
d44202ba HK |
4621 | begin |
4622 | Formal := First_Formal (Designator); | |
4623 | while Present (Formal) loop | |
4624 | Formal_Typ := Etype (Formal); | |
0a36105d | 4625 | |
d44202ba HK |
4626 | if Is_Concurrent_Type (Formal_Typ) |
4627 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4628 | then | |
4629 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
4630 | ||
4631 | if Present (Interfaces (Rec_Typ)) then | |
4632 | Set_Etype (Formal, Rec_Typ); | |
4633 | end if; | |
69cb258c AC |
4634 | |
4635 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
4636 | Desig_Typ := Designated_Type (Formal_Typ); | |
4637 | ||
4638 | if Is_Concurrent_Type (Desig_Typ) | |
4639 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
4640 | then | |
4641 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
4642 | ||
4643 | if Present (Interfaces (Rec_Typ)) then | |
4644 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
4645 | end if; | |
4646 | end if; | |
d44202ba HK |
4647 | end if; |
4648 | ||
4649 | Next_Formal (Formal); | |
4650 | end loop; | |
4651 | end; | |
758c442c GD |
4652 | end if; |
4653 | ||
fbf5a39b | 4654 | End_Scope; |
82c80734 | 4655 | |
b66c3ff4 AC |
4656 | -- The subprogram scope is pushed and popped around the processing of |
4657 | -- the return type for consistency with call above to Process_Formals | |
4658 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
4659 | -- itype created for the return type will be associated with the proper | |
4660 | -- scope. | |
4661 | ||
82c80734 | 4662 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 4663 | Push_Scope (Designator); |
82c80734 | 4664 | Analyze_Return_Type (N); |
b66c3ff4 | 4665 | End_Scope; |
fbf5a39b AC |
4666 | end if; |
4667 | ||
e606088a AC |
4668 | -- Function case |
4669 | ||
fbf5a39b | 4670 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
4671 | |
4672 | -- Deal with operator symbol case | |
4673 | ||
fbf5a39b AC |
4674 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
4675 | Valid_Operator_Definition (Designator); | |
4676 | end if; | |
4677 | ||
4678 | May_Need_Actuals (Designator); | |
4679 | ||
fe63b1b1 ES |
4680 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
4681 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
4682 | -- declarations, where abstractness is inherited, and to subprogram |
4683 | -- bodies generated for stream operations, which become renamings as | |
4684 | -- bodies. | |
2bfb1b72 | 4685 | |
fe63b1b1 ES |
4686 | -- In case of primitives associated with abstract interface types |
4687 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 4688 | |
1adaea16 | 4689 | if not Nkind_In (Original_Node (Parent (N)), |
3f80a182 AC |
4690 | N_Subprogram_Renaming_Declaration, |
4691 | N_Abstract_Subprogram_Declaration, | |
4692 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 4693 | then |
2e79de51 AC |
4694 | if Is_Abstract_Type (Etype (Designator)) |
4695 | and then not Is_Interface (Etype (Designator)) | |
4696 | then | |
4697 | Error_Msg_N | |
4698 | ("function that returns abstract type must be abstract", N); | |
4699 | ||
e606088a | 4700 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
4701 | -- access result whose designated type is abstract. |
4702 | ||
4703 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
4704 | and then | |
4705 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
4706 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 4707 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
4708 | then |
4709 | Error_Msg_N ("function whose access result designates " | |
3f80a182 | 4710 | & "abstract type must be abstract", N); |
2e79de51 | 4711 | end if; |
fbf5a39b AC |
4712 | end if; |
4713 | end if; | |
4714 | ||
4715 | return Designator; | |
4716 | end Analyze_Subprogram_Specification; | |
4717 | ||
996ae0b0 RK |
4718 | ----------------------- |
4719 | -- Check_Conformance -- | |
4720 | ----------------------- | |
4721 | ||
4722 | procedure Check_Conformance | |
41251c60 JM |
4723 | (New_Id : Entity_Id; |
4724 | Old_Id : Entity_Id; | |
4725 | Ctype : Conformance_Type; | |
4726 | Errmsg : Boolean; | |
4727 | Conforms : out Boolean; | |
4728 | Err_Loc : Node_Id := Empty; | |
4729 | Get_Inst : Boolean := False; | |
4730 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 4731 | is |
996ae0b0 | 4732 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
4733 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
4734 | -- If Errmsg is True, then processing continues to post an error message | |
4735 | -- for conformance error on given node. Two messages are output. The | |
4736 | -- first message points to the previous declaration with a general "no | |
4737 | -- conformance" message. The second is the detailed reason, supplied as | |
4738 | -- Msg. The parameter N provide information for a possible & insertion | |
4739 | -- in the message, and also provides the location for posting the | |
4740 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
4741 | |
4742 | ----------------------- | |
4743 | -- Conformance_Error -- | |
4744 | ----------------------- | |
4745 | ||
4746 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
4747 | Enode : Node_Id; | |
4748 | ||
4749 | begin | |
4750 | Conforms := False; | |
4751 | ||
4752 | if Errmsg then | |
4753 | if No (Err_Loc) then | |
4754 | Enode := N; | |
4755 | else | |
4756 | Enode := Err_Loc; | |
4757 | end if; | |
4758 | ||
4759 | Error_Msg_Sloc := Sloc (Old_Id); | |
4760 | ||
4761 | case Ctype is | |
4762 | when Type_Conformant => | |
483c78cb | 4763 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
4764 | ("not type conformant with declaration#!", Enode); |
4765 | ||
4766 | when Mode_Conformant => | |
19590d70 | 4767 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4768 | Error_Msg_N |
19590d70 GD |
4769 | ("not mode conformant with operation inherited#!", |
4770 | Enode); | |
4771 | else | |
ed2233dc | 4772 | Error_Msg_N |
19590d70 GD |
4773 | ("not mode conformant with declaration#!", Enode); |
4774 | end if; | |
996ae0b0 RK |
4775 | |
4776 | when Subtype_Conformant => | |
19590d70 | 4777 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4778 | Error_Msg_N |
19590d70 GD |
4779 | ("not subtype conformant with operation inherited#!", |
4780 | Enode); | |
4781 | else | |
ed2233dc | 4782 | Error_Msg_N |
19590d70 GD |
4783 | ("not subtype conformant with declaration#!", Enode); |
4784 | end if; | |
996ae0b0 RK |
4785 | |
4786 | when Fully_Conformant => | |
19590d70 | 4787 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 4788 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4789 | ("not fully conformant with operation inherited#!", |
4790 | Enode); | |
4791 | else | |
483c78cb | 4792 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4793 | ("not fully conformant with declaration#!", Enode); |
4794 | end if; | |
996ae0b0 RK |
4795 | end case; |
4796 | ||
4797 | Error_Msg_NE (Msg, Enode, N); | |
4798 | end if; | |
4799 | end Conformance_Error; | |
4800 | ||
ec4867fa ES |
4801 | -- Local Variables |
4802 | ||
4803 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
4804 | New_Type : constant Entity_Id := Etype (New_Id); | |
4805 | Old_Formal : Entity_Id; | |
4806 | New_Formal : Entity_Id; | |
4807 | Access_Types_Match : Boolean; | |
4808 | Old_Formal_Base : Entity_Id; | |
4809 | New_Formal_Base : Entity_Id; | |
4810 | ||
996ae0b0 RK |
4811 | -- Start of processing for Check_Conformance |
4812 | ||
4813 | begin | |
4814 | Conforms := True; | |
4815 | ||
82c80734 RD |
4816 | -- We need a special case for operators, since they don't appear |
4817 | -- explicitly. | |
996ae0b0 RK |
4818 | |
4819 | if Ctype = Type_Conformant then | |
4820 | if Ekind (New_Id) = E_Operator | |
4821 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
4822 | then | |
4823 | return; | |
4824 | end if; | |
4825 | end if; | |
4826 | ||
4827 | -- If both are functions/operators, check return types conform | |
4828 | ||
4829 | if Old_Type /= Standard_Void_Type | |
3cb9a885 AC |
4830 | and then |
4831 | New_Type /= Standard_Void_Type | |
996ae0b0 | 4832 | then |
fceeaab6 ES |
4833 | -- If we are checking interface conformance we omit controlling |
4834 | -- arguments and result, because we are only checking the conformance | |
4835 | -- of the remaining parameters. | |
4836 | ||
4837 | if Has_Controlling_Result (Old_Id) | |
4838 | and then Has_Controlling_Result (New_Id) | |
4839 | and then Skip_Controlling_Formals | |
4840 | then | |
4841 | null; | |
4842 | ||
4843 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
7f568bfa AC |
4844 | if Ctype >= Subtype_Conformant |
4845 | and then not Predicates_Match (Old_Type, New_Type) | |
4846 | then | |
4847 | Conformance_Error | |
4848 | ("\predicate of return type does not match!", New_Id); | |
4849 | else | |
4850 | Conformance_Error | |
4851 | ("\return type does not match!", New_Id); | |
4852 | end if; | |
4853 | ||
996ae0b0 RK |
4854 | return; |
4855 | end if; | |
4856 | ||
41251c60 | 4857 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 4858 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 4859 | |
0791fbe9 | 4860 | if Ada_Version >= Ada_2005 |
41251c60 JM |
4861 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
4862 | and then | |
8fde064e AC |
4863 | (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
4864 | or else Is_Access_Constant (Etype (Old_Type)) /= | |
4865 | Is_Access_Constant (Etype (New_Type))) | |
41251c60 | 4866 | then |
5d37ba92 | 4867 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
4868 | return; |
4869 | end if; | |
4870 | ||
996ae0b0 RK |
4871 | -- If either is a function/operator and the other isn't, error |
4872 | ||
4873 | elsif Old_Type /= Standard_Void_Type | |
4874 | or else New_Type /= Standard_Void_Type | |
4875 | then | |
5d37ba92 | 4876 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
4877 | return; |
4878 | end if; | |
4879 | ||
0a36105d | 4880 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
4881 | -- If this is a renaming as body, refine error message to indicate that |
4882 | -- the conflict is with the original declaration. If the entity is not | |
4883 | -- frozen, the conventions don't have to match, the one of the renamed | |
4884 | -- entity is inherited. | |
4885 | ||
4886 | if Ctype >= Subtype_Conformant then | |
996ae0b0 | 4887 | if Convention (Old_Id) /= Convention (New_Id) then |
996ae0b0 RK |
4888 | if not Is_Frozen (New_Id) then |
4889 | null; | |
4890 | ||
4891 | elsif Present (Err_Loc) | |
4892 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
4893 | and then Present (Corresponding_Spec (Err_Loc)) | |
4894 | then | |
4895 | Error_Msg_Name_1 := Chars (New_Id); | |
4896 | Error_Msg_Name_2 := | |
4897 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 4898 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
4899 | |
4900 | else | |
5d37ba92 | 4901 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
4902 | end if; |
4903 | ||
4904 | return; | |
4905 | ||
4906 | elsif Is_Formal_Subprogram (Old_Id) | |
4907 | or else Is_Formal_Subprogram (New_Id) | |
4908 | then | |
5d37ba92 | 4909 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 | 4910 | return; |
c5cec2fe AC |
4911 | |
4912 | -- Pragma Ghost behaves as a convention in the context of subtype | |
10274386 AC |
4913 | -- conformance (SPARK RM 6.9(5)). Do not check internally generated |
4914 | -- subprograms as their spec may reside in a Ghost region and their | |
4915 | -- body not, or vice versa. | |
c5cec2fe | 4916 | |
10274386 AC |
4917 | elsif Comes_From_Source (Old_Id) |
4918 | and then Comes_From_Source (New_Id) | |
4919 | and then Is_Ghost_Entity (Old_Id) /= Is_Ghost_Entity (New_Id) | |
4920 | then | |
c5cec2fe AC |
4921 | Conformance_Error ("\ghost modes do not match!"); |
4922 | return; | |
996ae0b0 RK |
4923 | end if; |
4924 | end if; | |
4925 | ||
4926 | -- Deal with parameters | |
4927 | ||
4928 | -- Note: we use the entity information, rather than going directly | |
4929 | -- to the specification in the tree. This is not only simpler, but | |
4930 | -- absolutely necessary for some cases of conformance tests between | |
a90bd866 | 4931 | -- operators, where the declaration tree simply does not exist. |
996ae0b0 RK |
4932 | |
4933 | Old_Formal := First_Formal (Old_Id); | |
4934 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 4935 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
4936 | if Is_Controlling_Formal (Old_Formal) |
4937 | and then Is_Controlling_Formal (New_Formal) | |
4938 | and then Skip_Controlling_Formals | |
4939 | then | |
a2dc5812 AC |
4940 | -- The controlling formals will have different types when |
4941 | -- comparing an interface operation with its match, but both | |
4942 | -- or neither must be access parameters. | |
4943 | ||
4944 | if Is_Access_Type (Etype (Old_Formal)) | |
4945 | = | |
4946 | Is_Access_Type (Etype (New_Formal)) | |
4947 | then | |
4948 | goto Skip_Controlling_Formal; | |
4949 | else | |
4950 | Conformance_Error | |
4951 | ("\access parameter does not match!", New_Formal); | |
4952 | end if; | |
41251c60 JM |
4953 | end if; |
4954 | ||
21791d97 | 4955 | -- Ada 2012: Mode conformance also requires that formal parameters |
2a290fec AC |
4956 | -- be both aliased, or neither. |
4957 | ||
21791d97 | 4958 | if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
2a290fec AC |
4959 | if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
4960 | Conformance_Error | |
4961 | ("\aliased parameter mismatch!", New_Formal); | |
4962 | end if; | |
4963 | end if; | |
4964 | ||
fbf5a39b AC |
4965 | if Ctype = Fully_Conformant then |
4966 | ||
4967 | -- Names must match. Error message is more accurate if we do | |
4968 | -- this before checking that the types of the formals match. | |
4969 | ||
4970 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
3ccedacc | 4971 | Conformance_Error ("\name& does not match!", New_Formal); |
fbf5a39b AC |
4972 | |
4973 | -- Set error posted flag on new formal as well to stop | |
4974 | -- junk cascaded messages in some cases. | |
4975 | ||
4976 | Set_Error_Posted (New_Formal); | |
4977 | return; | |
4978 | end if; | |
40b93859 RD |
4979 | |
4980 | -- Null exclusion must match | |
4981 | ||
4982 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
4983 | /= | |
4984 | Null_Exclusion_Present (Parent (New_Formal)) | |
4985 | then | |
4986 | -- Only give error if both come from source. This should be | |
4987 | -- investigated some time, since it should not be needed ??? | |
4988 | ||
4989 | if Comes_From_Source (Old_Formal) | |
4990 | and then | |
4991 | Comes_From_Source (New_Formal) | |
4992 | then | |
4993 | Conformance_Error | |
3ccedacc | 4994 | ("\null exclusion for& does not match", New_Formal); |
40b93859 RD |
4995 | |
4996 | -- Mark error posted on the new formal to avoid duplicated | |
4997 | -- complaint about types not matching. | |
4998 | ||
4999 | Set_Error_Posted (New_Formal); | |
5000 | end if; | |
5001 | end if; | |
fbf5a39b | 5002 | end if; |
996ae0b0 | 5003 | |
ec4867fa ES |
5004 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
5005 | -- case occurs whenever a subprogram is being renamed and one of its | |
5006 | -- parameters imposes a null exclusion. For example: | |
5007 | ||
5008 | -- type T is null record; | |
5009 | -- type Acc_T is access T; | |
5010 | -- subtype Acc_T_Sub is Acc_T; | |
5011 | ||
5012 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
5013 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
5014 | -- renames P; | |
5015 | ||
5016 | Old_Formal_Base := Etype (Old_Formal); | |
5017 | New_Formal_Base := Etype (New_Formal); | |
5018 | ||
5019 | if Get_Inst then | |
5020 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
5021 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
5022 | end if; | |
5023 | ||
0791fbe9 | 5024 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa | 5025 | |
8fde064e AC |
5026 | -- Ensure that this rule is only applied when New_Id is a |
5027 | -- renaming of Old_Id. | |
ec4867fa | 5028 | |
5d37ba92 ES |
5029 | and then Nkind (Parent (Parent (New_Id))) = |
5030 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
5031 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
5032 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
5033 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
5034 | ||
8fde064e | 5035 | -- Now handle the allowed access-type case |
ec4867fa ES |
5036 | |
5037 | and then Is_Access_Type (Old_Formal_Base) | |
5038 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 | 5039 | |
8fde064e AC |
5040 | -- The type kinds must match. The only exception occurs with |
5041 | -- multiple generics of the form: | |
5d37ba92 | 5042 | |
8fde064e AC |
5043 | -- generic generic |
5044 | -- type F is private; type A is private; | |
5045 | -- type F_Ptr is access F; type A_Ptr is access A; | |
5046 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
5047 | -- package F_Pack is ... package A_Pack is | |
5048 | -- package F_Inst is | |
5049 | -- new F_Pack (A, A_Ptr, A_P); | |
5d37ba92 | 5050 | |
8fde064e AC |
5051 | -- When checking for conformance between the parameters of A_P |
5052 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
5053 | -- because the compiler has transformed A_Ptr into a subtype of | |
5054 | -- F_Ptr. We catch this case in the code below. | |
5d37ba92 ES |
5055 | |
5056 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4b6f99f5 RD |
5057 | or else |
5058 | (Is_Generic_Type (Old_Formal_Base) | |
5059 | and then Is_Generic_Type (New_Formal_Base) | |
5060 | and then Is_Internal (New_Formal_Base) | |
5061 | and then Etype (Etype (New_Formal_Base)) = | |
5062 | Old_Formal_Base)) | |
5063 | and then Directly_Designated_Type (Old_Formal_Base) = | |
5064 | Directly_Designated_Type (New_Formal_Base) | |
ec4867fa ES |
5065 | and then ((Is_Itype (Old_Formal_Base) |
5066 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
4b6f99f5 RD |
5067 | or else |
5068 | (Is_Itype (New_Formal_Base) | |
5069 | and then Can_Never_Be_Null (New_Formal_Base))); | |
ec4867fa | 5070 | |
996ae0b0 RK |
5071 | -- Types must always match. In the visible part of an instance, |
5072 | -- usual overloading rules for dispatching operations apply, and | |
5073 | -- we check base types (not the actual subtypes). | |
5074 | ||
5075 | if In_Instance_Visible_Part | |
5076 | and then Is_Dispatching_Operation (New_Id) | |
5077 | then | |
5078 | if not Conforming_Types | |
ec4867fa ES |
5079 | (T1 => Base_Type (Etype (Old_Formal)), |
5080 | T2 => Base_Type (Etype (New_Formal)), | |
5081 | Ctype => Ctype, | |
5082 | Get_Inst => Get_Inst) | |
5083 | and then not Access_Types_Match | |
996ae0b0 | 5084 | then |
5d37ba92 | 5085 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
5086 | return; |
5087 | end if; | |
5088 | ||
5089 | elsif not Conforming_Types | |
5d37ba92 ES |
5090 | (T1 => Old_Formal_Base, |
5091 | T2 => New_Formal_Base, | |
ec4867fa ES |
5092 | Ctype => Ctype, |
5093 | Get_Inst => Get_Inst) | |
5094 | and then not Access_Types_Match | |
996ae0b0 | 5095 | then |
c27f2f15 RD |
5096 | -- Don't give error message if old type is Any_Type. This test |
5097 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
5098 | ||
5099 | if Errmsg and then Old_Formal_Base = Any_Type then | |
5100 | Conforms := False; | |
5101 | else | |
7f568bfa AC |
5102 | if Ctype >= Subtype_Conformant |
5103 | and then | |
5104 | not Predicates_Match (Old_Formal_Base, New_Formal_Base) | |
5105 | then | |
5106 | Conformance_Error | |
5107 | ("\predicate of & does not match!", New_Formal); | |
5108 | else | |
5109 | Conformance_Error | |
5110 | ("\type of & does not match!", New_Formal); | |
5111 | end if; | |
c27f2f15 RD |
5112 | end if; |
5113 | ||
996ae0b0 RK |
5114 | return; |
5115 | end if; | |
5116 | ||
5117 | -- For mode conformance, mode must match | |
5118 | ||
5d37ba92 ES |
5119 | if Ctype >= Mode_Conformant then |
5120 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
5121 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
5122 | or else not Is_Primitive_Wrapper (New_Id) | |
5123 | then | |
5124 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 5125 | |
dd54644b JM |
5126 | else |
5127 | declare | |
c199ccf7 | 5128 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b | 5129 | begin |
3ccedacc | 5130 | if Is_Protected_Type (Corresponding_Concurrent_Type (T)) |
dd54644b | 5131 | then |
2c6336be | 5132 | Error_Msg_PT (New_Id, Ultimate_Alias (Old_Id)); |
dd54644b JM |
5133 | else |
5134 | Conformance_Error | |
5135 | ("\mode of & does not match!", New_Formal); | |
5136 | end if; | |
5137 | end; | |
5138 | end if; | |
5139 | ||
5d37ba92 ES |
5140 | return; |
5141 | ||
5142 | -- Part of mode conformance for access types is having the same | |
5143 | -- constant modifier. | |
5144 | ||
5145 | elsif Access_Types_Match | |
5146 | and then Is_Access_Constant (Old_Formal_Base) /= | |
5147 | Is_Access_Constant (New_Formal_Base) | |
5148 | then | |
5149 | Conformance_Error | |
5150 | ("\constant modifier does not match!", New_Formal); | |
5151 | return; | |
5152 | end if; | |
996ae0b0 RK |
5153 | end if; |
5154 | ||
0a36105d | 5155 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 5156 | |
0a36105d JM |
5157 | -- Ada 2005 (AI-231): In case of anonymous access types check |
5158 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
5159 | -- match. For null exclusion, we test the types rather than the |
5160 | -- formals themselves, since the attribute is only set reliably | |
5161 | -- on the formals in the Ada 95 case, and we exclude the case | |
5162 | -- where Old_Formal is marked as controlling, to avoid errors | |
5163 | -- when matching completing bodies with dispatching declarations | |
5164 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 5165 | |
0791fbe9 | 5166 | if Ada_Version >= Ada_2005 |
0a36105d JM |
5167 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
5168 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
5169 | and then | |
c7b9d548 AC |
5170 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
5171 | Can_Never_Be_Null (Etype (New_Formal)) | |
5172 | and then | |
5173 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
5174 | or else |
5175 | Is_Access_Constant (Etype (Old_Formal)) /= | |
5176 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
5177 | |
5178 | -- Do not complain if error already posted on New_Formal. This | |
5179 | -- avoids some redundant error messages. | |
5180 | ||
5181 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
5182 | then |
5183 | -- It is allowed to omit the null-exclusion in case of stream | |
5184 | -- attribute subprograms. We recognize stream subprograms | |
5185 | -- through their TSS-generated suffix. | |
996ae0b0 | 5186 | |
0a36105d JM |
5187 | declare |
5188 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
3ada950b | 5189 | |
0a36105d JM |
5190 | begin |
5191 | if TSS_Name /= TSS_Stream_Read | |
5192 | and then TSS_Name /= TSS_Stream_Write | |
5193 | and then TSS_Name /= TSS_Stream_Input | |
5194 | and then TSS_Name /= TSS_Stream_Output | |
5195 | then | |
3ada950b | 5196 | -- Here we have a definite conformance error. It is worth |
71fb4dc8 | 5197 | -- special casing the error message for the case of a |
3ada950b AC |
5198 | -- controlling formal (which excludes null). |
5199 | ||
5200 | if Is_Controlling_Formal (New_Formal) then | |
5201 | Error_Msg_Node_2 := Scope (New_Formal); | |
5202 | Conformance_Error | |
3ccedacc AC |
5203 | ("\controlling formal & of & excludes null, " |
5204 | & "declaration must exclude null as well", | |
5205 | New_Formal); | |
3ada950b AC |
5206 | |
5207 | -- Normal case (couldn't we give more detail here???) | |
5208 | ||
5209 | else | |
5210 | Conformance_Error | |
5211 | ("\type of & does not match!", New_Formal); | |
5212 | end if; | |
5213 | ||
0a36105d JM |
5214 | return; |
5215 | end if; | |
5216 | end; | |
5217 | end if; | |
5218 | end if; | |
41251c60 | 5219 | |
0a36105d | 5220 | -- Full conformance checks |
41251c60 | 5221 | |
0a36105d | 5222 | if Ctype = Fully_Conformant then |
e660dbf7 | 5223 | |
0a36105d | 5224 | -- We have checked already that names match |
e660dbf7 | 5225 | |
0a36105d | 5226 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
5227 | |
5228 | -- Check default expressions for in parameters | |
5229 | ||
996ae0b0 RK |
5230 | declare |
5231 | NewD : constant Boolean := | |
5232 | Present (Default_Value (New_Formal)); | |
5233 | OldD : constant Boolean := | |
5234 | Present (Default_Value (Old_Formal)); | |
5235 | begin | |
5236 | if NewD or OldD then | |
5237 | ||
82c80734 RD |
5238 | -- The old default value has been analyzed because the |
5239 | -- current full declaration will have frozen everything | |
0a36105d JM |
5240 | -- before. The new default value has not been analyzed, |
5241 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
5242 | |
5243 | if NewD then | |
0a36105d | 5244 | Push_Scope (New_Id); |
21d27997 | 5245 | Preanalyze_Spec_Expression |
fbf5a39b | 5246 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
5247 | End_Scope; |
5248 | end if; | |
5249 | ||
5250 | if not (NewD and OldD) | |
5251 | or else not Fully_Conformant_Expressions | |
5252 | (Default_Value (Old_Formal), | |
5253 | Default_Value (New_Formal)) | |
5254 | then | |
5255 | Conformance_Error | |
5d37ba92 | 5256 | ("\default expression for & does not match!", |
996ae0b0 RK |
5257 | New_Formal); |
5258 | return; | |
5259 | end if; | |
5260 | end if; | |
5261 | end; | |
5262 | end if; | |
5263 | end if; | |
5264 | ||
5265 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 5266 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
5267 | -- or if either old or new instance is not from the source program. |
5268 | ||
0ab80019 | 5269 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5270 | and then Sloc (Old_Id) > Standard_Location |
5271 | and then Sloc (New_Id) > Standard_Location | |
5272 | and then Comes_From_Source (Old_Id) | |
5273 | and then Comes_From_Source (New_Id) | |
5274 | then | |
5275 | declare | |
5276 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
5277 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
5278 | ||
5279 | begin | |
5280 | -- Explicit IN must be present or absent in both cases. This | |
5281 | -- test is required only in the full conformance case. | |
5282 | ||
5283 | if In_Present (Old_Param) /= In_Present (New_Param) | |
5284 | and then Ctype = Fully_Conformant | |
5285 | then | |
5286 | Conformance_Error | |
5d37ba92 | 5287 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
5288 | New_Formal); |
5289 | return; | |
5290 | end if; | |
5291 | ||
5292 | -- Grouping (use of comma in param lists) must be the same | |
5293 | -- This is where we catch a misconformance like: | |
5294 | ||
0a36105d | 5295 | -- A, B : Integer |
996ae0b0 RK |
5296 | -- A : Integer; B : Integer |
5297 | ||
5298 | -- which are represented identically in the tree except | |
5299 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5300 | ||
5301 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
5302 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
5303 | then | |
5304 | Conformance_Error | |
5d37ba92 | 5305 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
5306 | return; |
5307 | end if; | |
5308 | end; | |
5309 | end if; | |
5310 | ||
41251c60 JM |
5311 | -- This label is required when skipping controlling formals |
5312 | ||
5313 | <<Skip_Controlling_Formal>> | |
5314 | ||
996ae0b0 RK |
5315 | Next_Formal (Old_Formal); |
5316 | Next_Formal (New_Formal); | |
5317 | end loop; | |
5318 | ||
5319 | if Present (Old_Formal) then | |
5d37ba92 | 5320 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
5321 | return; |
5322 | ||
5323 | elsif Present (New_Formal) then | |
5d37ba92 | 5324 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
5325 | return; |
5326 | end if; | |
996ae0b0 RK |
5327 | end Check_Conformance; |
5328 | ||
ec4867fa ES |
5329 | ----------------------- |
5330 | -- Check_Conventions -- | |
5331 | ----------------------- | |
5332 | ||
5333 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 5334 | Ifaces_List : Elist_Id; |
0a36105d | 5335 | |
ce2b6ba5 | 5336 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
5337 | -- Verify that the convention of inherited dispatching operation Op is |
5338 | -- consistent among all subprograms it overrides. In order to minimize | |
5339 | -- the search, Search_From is utilized to designate a specific point in | |
5340 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
5341 | |
5342 | ---------------------- | |
5343 | -- Check_Convention -- | |
5344 | ---------------------- | |
5345 | ||
ce2b6ba5 | 5346 | procedure Check_Convention (Op : Entity_Id) is |
c5cec2fe | 5347 | Op_Conv : constant Convention_Id := Convention (Op); |
9f6aaa5c | 5348 | Iface_Conv : Convention_Id; |
ce2b6ba5 JM |
5349 | Iface_Elmt : Elmt_Id; |
5350 | Iface_Prim_Elmt : Elmt_Id; | |
5351 | Iface_Prim : Entity_Id; | |
ec4867fa | 5352 | |
ce2b6ba5 JM |
5353 | begin |
5354 | Iface_Elmt := First_Elmt (Ifaces_List); | |
5355 | while Present (Iface_Elmt) loop | |
5356 | Iface_Prim_Elmt := | |
9f6aaa5c | 5357 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
ce2b6ba5 JM |
5358 | while Present (Iface_Prim_Elmt) loop |
5359 | Iface_Prim := Node (Iface_Prim_Elmt); | |
c5cec2fe | 5360 | Iface_Conv := Convention (Iface_Prim); |
ce2b6ba5 JM |
5361 | |
5362 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
9f6aaa5c | 5363 | and then Iface_Conv /= Op_Conv |
ce2b6ba5 | 5364 | then |
ed2233dc | 5365 | Error_Msg_N |
ce2b6ba5 | 5366 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 5367 | |
ce2b6ba5 | 5368 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c | 5369 | Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
ce2b6ba5 | 5370 | Error_Msg_Sloc := Sloc (Op); |
ec4867fa | 5371 | |
7a963087 | 5372 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 5373 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 5374 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 5375 | else |
ed2233dc | 5376 | Error_Msg_N |
3ccedacc AC |
5377 | ("\\overriding operation % with " |
5378 | & "convention % defined #", Typ); | |
ce2b6ba5 | 5379 | end if; |
ec4867fa | 5380 | |
ce2b6ba5 JM |
5381 | else pragma Assert (Present (Alias (Op))); |
5382 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
3ccedacc AC |
5383 | Error_Msg_N ("\\inherited operation % with " |
5384 | & "convention % defined #", Typ); | |
ce2b6ba5 | 5385 | end if; |
ec4867fa | 5386 | |
ce2b6ba5 | 5387 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c AC |
5388 | Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
5389 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
3ccedacc AC |
5390 | Error_Msg_N ("\\overridden operation % with " |
5391 | & "convention % defined #", Typ); | |
ec4867fa | 5392 | |
ce2b6ba5 | 5393 | -- Avoid cascading errors |
ec4867fa | 5394 | |
ce2b6ba5 JM |
5395 | return; |
5396 | end if; | |
ec4867fa | 5397 | |
ce2b6ba5 JM |
5398 | Next_Elmt (Iface_Prim_Elmt); |
5399 | end loop; | |
ec4867fa | 5400 | |
ce2b6ba5 | 5401 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
5402 | end loop; |
5403 | end Check_Convention; | |
5404 | ||
5405 | -- Local variables | |
5406 | ||
5407 | Prim_Op : Entity_Id; | |
5408 | Prim_Op_Elmt : Elmt_Id; | |
5409 | ||
5410 | -- Start of processing for Check_Conventions | |
5411 | ||
5412 | begin | |
ce2b6ba5 JM |
5413 | if not Has_Interfaces (Typ) then |
5414 | return; | |
5415 | end if; | |
5416 | ||
5417 | Collect_Interfaces (Typ, Ifaces_List); | |
5418 | ||
0a36105d JM |
5419 | -- The algorithm checks every overriding dispatching operation against |
5420 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 5421 | -- differences in conventions. |
ec4867fa ES |
5422 | |
5423 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
5424 | while Present (Prim_Op_Elmt) loop | |
5425 | Prim_Op := Node (Prim_Op_Elmt); | |
5426 | ||
0a36105d | 5427 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 5428 | -- since they always have the same convention. |
ec4867fa | 5429 | |
ce2b6ba5 JM |
5430 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
5431 | Check_Convention (Prim_Op); | |
ec4867fa ES |
5432 | end if; |
5433 | ||
5434 | Next_Elmt (Prim_Op_Elmt); | |
5435 | end loop; | |
5436 | end Check_Conventions; | |
5437 | ||
996ae0b0 RK |
5438 | ------------------------------ |
5439 | -- Check_Delayed_Subprogram -- | |
5440 | ------------------------------ | |
5441 | ||
5442 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
5443 | F : Entity_Id; | |
5444 | ||
5445 | procedure Possible_Freeze (T : Entity_Id); | |
5446 | -- T is the type of either a formal parameter or of the return type. | |
5447 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
5448 | -- subprogram itself must be delayed. If T is the limited view of an |
5449 | -- incomplete type the subprogram must be frozen as well, because | |
5450 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 5451 | |
82c80734 RD |
5452 | --------------------- |
5453 | -- Possible_Freeze -- | |
5454 | --------------------- | |
5455 | ||
996ae0b0 RK |
5456 | procedure Possible_Freeze (T : Entity_Id) is |
5457 | begin | |
4a13695c | 5458 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
5459 | Set_Has_Delayed_Freeze (Designator); |
5460 | ||
5461 | elsif Is_Access_Type (T) | |
5462 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
5463 | and then not Is_Frozen (Designated_Type (T)) | |
5464 | then | |
5465 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 5466 | |
7b56a91b AC |
5467 | elsif Ekind (T) = E_Incomplete_Type |
5468 | and then From_Limited_With (T) | |
5469 | then | |
e358346d | 5470 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 5471 | |
9aff36e9 RD |
5472 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
5473 | -- of a subprogram or entry declaration. | |
406935b6 AC |
5474 | |
5475 | elsif Ekind (T) = E_Incomplete_Type | |
5476 | and then Ada_Version >= Ada_2012 | |
5477 | then | |
5478 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 5479 | end if; |
4a13695c | 5480 | |
996ae0b0 RK |
5481 | end Possible_Freeze; |
5482 | ||
5483 | -- Start of processing for Check_Delayed_Subprogram | |
5484 | ||
5485 | begin | |
76e3504f AC |
5486 | -- All subprograms, including abstract subprograms, may need a freeze |
5487 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 5488 | |
76e3504f AC |
5489 | Possible_Freeze (Etype (Designator)); |
5490 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 5491 | |
76e3504f AC |
5492 | -- Need delayed freeze if any of the formal types themselves need |
5493 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 5494 | |
76e3504f AC |
5495 | F := First_Formal (Designator); |
5496 | while Present (F) loop | |
5497 | Possible_Freeze (Etype (F)); | |
5498 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
5499 | Next_Formal (F); | |
5500 | end loop; | |
996ae0b0 RK |
5501 | |
5502 | -- Mark functions that return by reference. Note that it cannot be | |
5503 | -- done for delayed_freeze subprograms because the underlying | |
5504 | -- returned type may not be known yet (for private types) | |
5505 | ||
8fde064e | 5506 | if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
996ae0b0 RK |
5507 | declare |
5508 | Typ : constant Entity_Id := Etype (Designator); | |
5509 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
996ae0b0 | 5510 | begin |
51245e2d | 5511 | if Is_Limited_View (Typ) then |
996ae0b0 | 5512 | Set_Returns_By_Ref (Designator); |
048e5cef | 5513 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
5514 | Set_Returns_By_Ref (Designator); |
5515 | end if; | |
5516 | end; | |
5517 | end if; | |
5518 | end Check_Delayed_Subprogram; | |
5519 | ||
5520 | ------------------------------------ | |
5521 | -- Check_Discriminant_Conformance -- | |
5522 | ------------------------------------ | |
5523 | ||
5524 | procedure Check_Discriminant_Conformance | |
5525 | (N : Node_Id; | |
5526 | Prev : Entity_Id; | |
5527 | Prev_Loc : Node_Id) | |
5528 | is | |
5529 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
5530 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
5531 | New_Discr_Id : Entity_Id; | |
5532 | New_Discr_Type : Entity_Id; | |
5533 | ||
5534 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
5535 | -- Post error message for conformance error on given node. Two messages |
5536 | -- are output. The first points to the previous declaration with a | |
5537 | -- general "no conformance" message. The second is the detailed reason, | |
5538 | -- supplied as Msg. The parameter N provide information for a possible | |
5539 | -- & insertion in the message. | |
996ae0b0 RK |
5540 | |
5541 | ----------------------- | |
5542 | -- Conformance_Error -- | |
5543 | ----------------------- | |
5544 | ||
5545 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
5546 | begin | |
5547 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
5548 | Error_Msg_N -- CODEFIX |
5549 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
5550 | Error_Msg_NE (Msg, N, N); |
5551 | end Conformance_Error; | |
5552 | ||
5553 | -- Start of processing for Check_Discriminant_Conformance | |
5554 | ||
5555 | begin | |
5556 | while Present (Old_Discr) and then Present (New_Discr) loop | |
996ae0b0 RK |
5557 | New_Discr_Id := Defining_Identifier (New_Discr); |
5558 | ||
82c80734 RD |
5559 | -- The subtype mark of the discriminant on the full type has not |
5560 | -- been analyzed so we do it here. For an access discriminant a new | |
5561 | -- type is created. | |
996ae0b0 RK |
5562 | |
5563 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
5564 | New_Discr_Type := | |
5565 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
5566 | ||
5567 | else | |
5568 | Analyze (Discriminant_Type (New_Discr)); | |
5569 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
5570 | |
5571 | -- Ada 2005: if the discriminant definition carries a null | |
5572 | -- exclusion, create an itype to check properly for consistency | |
5573 | -- with partial declaration. | |
5574 | ||
5575 | if Is_Access_Type (New_Discr_Type) | |
8fde064e | 5576 | and then Null_Exclusion_Present (New_Discr) |
e50e1c5e AC |
5577 | then |
5578 | New_Discr_Type := | |
5579 | Create_Null_Excluding_Itype | |
5580 | (T => New_Discr_Type, | |
5581 | Related_Nod => New_Discr, | |
5582 | Scope_Id => Current_Scope); | |
5583 | end if; | |
996ae0b0 RK |
5584 | end if; |
5585 | ||
5586 | if not Conforming_Types | |
5587 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
5588 | then | |
5589 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
5590 | return; | |
fbf5a39b | 5591 | else |
82c80734 RD |
5592 | -- Treat the new discriminant as an occurrence of the old one, |
5593 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
5594 | -- information, for completeness. |
5595 | ||
5596 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
5597 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
5598 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
5599 | end if; |
5600 | ||
5601 | -- Names must match | |
5602 | ||
5603 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
5604 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
5605 | return; | |
5606 | end if; | |
5607 | ||
5608 | -- Default expressions must match | |
5609 | ||
5610 | declare | |
5611 | NewD : constant Boolean := | |
5612 | Present (Expression (New_Discr)); | |
5613 | OldD : constant Boolean := | |
5614 | Present (Expression (Parent (Old_Discr))); | |
5615 | ||
5616 | begin | |
5617 | if NewD or OldD then | |
5618 | ||
5619 | -- The old default value has been analyzed and expanded, | |
5620 | -- because the current full declaration will have frozen | |
82c80734 RD |
5621 | -- everything before. The new default values have not been |
5622 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
5623 | |
5624 | if NewD then | |
21d27997 | 5625 | Preanalyze_Spec_Expression |
996ae0b0 RK |
5626 | (Expression (New_Discr), New_Discr_Type); |
5627 | end if; | |
5628 | ||
5629 | if not (NewD and OldD) | |
5630 | or else not Fully_Conformant_Expressions | |
5631 | (Expression (Parent (Old_Discr)), | |
5632 | Expression (New_Discr)) | |
5633 | ||
5634 | then | |
5635 | Conformance_Error | |
5636 | ("default expression for & does not match!", | |
5637 | New_Discr_Id); | |
5638 | return; | |
5639 | end if; | |
5640 | end if; | |
5641 | end; | |
5642 | ||
5643 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
5644 | ||
0ab80019 | 5645 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
5646 | declare |
5647 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
5648 | ||
5649 | begin | |
5650 | -- Grouping (use of comma in param lists) must be the same | |
5651 | -- This is where we catch a misconformance like: | |
5652 | ||
60370fb1 | 5653 | -- A, B : Integer |
996ae0b0 RK |
5654 | -- A : Integer; B : Integer |
5655 | ||
5656 | -- which are represented identically in the tree except | |
5657 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5658 | ||
5659 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
5660 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
5661 | then | |
5662 | Conformance_Error | |
5663 | ("grouping of & does not match!", New_Discr_Id); | |
5664 | return; | |
5665 | end if; | |
5666 | end; | |
5667 | end if; | |
5668 | ||
5669 | Next_Discriminant (Old_Discr); | |
5670 | Next (New_Discr); | |
5671 | end loop; | |
5672 | ||
5673 | if Present (Old_Discr) then | |
5674 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
5675 | return; | |
5676 | ||
5677 | elsif Present (New_Discr) then | |
5678 | Conformance_Error | |
5679 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
5680 | return; | |
5681 | end if; | |
5682 | end Check_Discriminant_Conformance; | |
5683 | ||
5684 | ---------------------------- | |
5685 | -- Check_Fully_Conformant -- | |
5686 | ---------------------------- | |
5687 | ||
5688 | procedure Check_Fully_Conformant | |
5689 | (New_Id : Entity_Id; | |
5690 | Old_Id : Entity_Id; | |
5691 | Err_Loc : Node_Id := Empty) | |
5692 | is | |
5693 | Result : Boolean; | |
81db9d77 | 5694 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5695 | begin |
5696 | Check_Conformance | |
5697 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
5698 | end Check_Fully_Conformant; | |
5699 | ||
5700 | --------------------------- | |
5701 | -- Check_Mode_Conformant -- | |
5702 | --------------------------- | |
5703 | ||
5704 | procedure Check_Mode_Conformant | |
5705 | (New_Id : Entity_Id; | |
5706 | Old_Id : Entity_Id; | |
5707 | Err_Loc : Node_Id := Empty; | |
5708 | Get_Inst : Boolean := False) | |
5709 | is | |
5710 | Result : Boolean; | |
81db9d77 | 5711 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5712 | begin |
5713 | Check_Conformance | |
5714 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
5715 | end Check_Mode_Conformant; | |
5716 | ||
fbf5a39b | 5717 | -------------------------------- |
758c442c | 5718 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
5719 | -------------------------------- |
5720 | ||
758c442c | 5721 | procedure Check_Overriding_Indicator |
ec4867fa | 5722 | (Subp : Entity_Id; |
5d37ba92 ES |
5723 | Overridden_Subp : Entity_Id; |
5724 | Is_Primitive : Boolean) | |
fbf5a39b | 5725 | is |
758c442c GD |
5726 | Decl : Node_Id; |
5727 | Spec : Node_Id; | |
fbf5a39b AC |
5728 | |
5729 | begin | |
ec4867fa | 5730 | -- No overriding indicator for literals |
fbf5a39b | 5731 | |
ec4867fa | 5732 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 5733 | return; |
fbf5a39b | 5734 | |
ec4867fa ES |
5735 | elsif Ekind (Subp) = E_Entry then |
5736 | Decl := Parent (Subp); | |
5737 | ||
53b10ce9 AC |
5738 | -- No point in analyzing a malformed operator |
5739 | ||
5740 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
5741 | and then Error_Posted (Subp) | |
5742 | then | |
5743 | return; | |
5744 | ||
758c442c GD |
5745 | else |
5746 | Decl := Unit_Declaration_Node (Subp); | |
5747 | end if; | |
fbf5a39b | 5748 | |
800621e0 RD |
5749 | if Nkind_In (Decl, N_Subprogram_Body, |
5750 | N_Subprogram_Body_Stub, | |
5751 | N_Subprogram_Declaration, | |
5752 | N_Abstract_Subprogram_Declaration, | |
5753 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
5754 | then |
5755 | Spec := Specification (Decl); | |
ec4867fa ES |
5756 | |
5757 | elsif Nkind (Decl) = N_Entry_Declaration then | |
5758 | Spec := Decl; | |
5759 | ||
758c442c GD |
5760 | else |
5761 | return; | |
5762 | end if; | |
fbf5a39b | 5763 | |
e7d72fb9 AC |
5764 | -- The overriding operation is type conformant with the overridden one, |
5765 | -- but the names of the formals are not required to match. If the names | |
6823270c | 5766 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
5767 | -- source of confusion that is worth diagnosing. Controlling formals |
5768 | -- often carry names that reflect the type, and it is not worthwhile | |
5769 | -- requiring that their names match. | |
5770 | ||
c9e7bd8e | 5771 | if Present (Overridden_Subp) |
e7d72fb9 AC |
5772 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
5773 | then | |
5774 | declare | |
5775 | Form1 : Entity_Id; | |
5776 | Form2 : Entity_Id; | |
5777 | ||
5778 | begin | |
5779 | Form1 := First_Formal (Subp); | |
5780 | Form2 := First_Formal (Overridden_Subp); | |
5781 | ||
c9e7bd8e AC |
5782 | -- If the overriding operation is a synchronized operation, skip |
5783 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
5784 | -- implicit in the new one. If the operation is declared in the |
5785 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 5786 | |
6823270c AC |
5787 | if Is_Concurrent_Type (Scope (Subp)) |
5788 | and then Is_Tagged_Type (Scope (Subp)) | |
5789 | and then not Has_Completion (Scope (Subp)) | |
5790 | then | |
c9e7bd8e AC |
5791 | Form2 := Next_Formal (Form2); |
5792 | end if; | |
5793 | ||
e7d72fb9 AC |
5794 | if Present (Form1) then |
5795 | Form1 := Next_Formal (Form1); | |
5796 | Form2 := Next_Formal (Form2); | |
5797 | end if; | |
5798 | ||
5799 | while Present (Form1) loop | |
5800 | if not Is_Controlling_Formal (Form1) | |
5801 | and then Present (Next_Formal (Form2)) | |
5802 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
5803 | then | |
5804 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
5805 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 5806 | Error_Msg_NE |
19d846a0 | 5807 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
5808 | Form1, Form1); |
5809 | exit; | |
5810 | end if; | |
5811 | ||
5812 | Next_Formal (Form1); | |
5813 | Next_Formal (Form2); | |
5814 | end loop; | |
5815 | end; | |
5816 | end if; | |
5817 | ||
676e8420 AC |
5818 | -- If there is an overridden subprogram, then check that there is no |
5819 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
5820 | -- This is not done if the overridden subprogram is marked as hidden, |
5821 | -- which can occur for the case of inherited controlled operations | |
5822 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
5823 | -- subprogram is not itself hidden. (Note: This condition could probably | |
5824 | -- be simplified, leaving out the testing for the specific controlled | |
5825 | -- cases, but it seems safer and clearer this way, and echoes similar | |
5826 | -- special-case tests of this kind in other places.) | |
5827 | ||
fd0d899b | 5828 | if Present (Overridden_Subp) |
51bf9bdf AC |
5829 | and then (not Is_Hidden (Overridden_Subp) |
5830 | or else | |
b69cd36a AC |
5831 | (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
5832 | Name_Adjust, | |
5833 | Name_Finalize) | |
f0709ca6 AC |
5834 | and then Present (Alias (Overridden_Subp)) |
5835 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 5836 | then |
ec4867fa ES |
5837 | if Must_Not_Override (Spec) then |
5838 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 5839 | |
ec4867fa | 5840 | if Ekind (Subp) = E_Entry then |
ed2233dc | 5841 | Error_Msg_NE |
5d37ba92 | 5842 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5843 | else |
ed2233dc | 5844 | Error_Msg_NE |
5d37ba92 | 5845 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5846 | end if; |
21d27997 | 5847 | |
bd603506 | 5848 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
5849 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
5850 | -- operation. This operation should not be inherited by other limited | |
5851 | -- controlled types. An explicit Adjust for them is not overriding. | |
5852 | ||
5853 | elsif Must_Override (Spec) | |
5854 | and then Chars (Overridden_Subp) = Name_Adjust | |
5855 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
5856 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
5857 | and then |
5858 | Is_Predefined_File_Name | |
5859 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
5860 | then |
5861 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5862 | ||
21d27997 | 5863 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
5864 | if Is_Init_Proc (Subp) then |
5865 | null; | |
5866 | ||
5867 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
5868 | |
5869 | -- For entities generated by Derive_Subprograms the overridden | |
5870 | -- operation is the inherited primitive (which is available | |
5871 | -- through the attribute alias) | |
5872 | ||
5873 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 5874 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 5875 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
5876 | and then Find_Dispatching_Type (Overridden_Subp) = |
5877 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
5878 | and then Present (Alias (Overridden_Subp)) |
5879 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
5880 | then | |
039538bc AC |
5881 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); |
5882 | Inherit_Subprogram_Contract (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 5883 | |
1c1289e7 | 5884 | else |
039538bc AC |
5885 | Set_Overridden_Operation (Subp, Overridden_Subp); |
5886 | Inherit_Subprogram_Contract (Subp, Overridden_Subp); | |
1c1289e7 AC |
5887 | end if; |
5888 | end if; | |
ec4867fa | 5889 | end if; |
f937473f | 5890 | |
618fb570 AC |
5891 | -- If primitive flag is set or this is a protected operation, then |
5892 | -- the operation is overriding at the point of its declaration, so | |
5893 | -- warn if necessary. Otherwise it may have been declared before the | |
5894 | -- operation it overrides and no check is required. | |
3c25856a AC |
5895 | |
5896 | if Style_Check | |
618fb570 AC |
5897 | and then not Must_Override (Spec) |
5898 | and then (Is_Primitive | |
5899 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 5900 | then |
235f4375 AC |
5901 | Style.Missing_Overriding (Decl, Subp); |
5902 | end if; | |
5903 | ||
53b10ce9 AC |
5904 | -- If Subp is an operator, it may override a predefined operation, if |
5905 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 5906 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
5907 | -- representation for predefined operators. We have to check whether the |
5908 | -- signature of Subp matches that of a predefined operator. Note that | |
5909 | -- first argument provides the name of the operator, and the second | |
5910 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
5911 | -- If the indicator is overriding, then the operator must match a |
5912 | -- predefined signature, because we know already that there is no | |
5913 | -- explicit overridden operation. | |
f937473f | 5914 | |
21d27997 | 5915 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 5916 | if Must_Not_Override (Spec) then |
f937473f | 5917 | |
806f6d37 AC |
5918 | -- If this is not a primitive or a protected subprogram, then |
5919 | -- "not overriding" is illegal. | |
618fb570 | 5920 | |
806f6d37 AC |
5921 | if not Is_Primitive |
5922 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5923 | then | |
3ccedacc AC |
5924 | Error_Msg_N ("overriding indicator only allowed " |
5925 | & "if subprogram is primitive", Subp); | |
618fb570 | 5926 | |
806f6d37 AC |
5927 | elsif Can_Override_Operator (Subp) then |
5928 | Error_Msg_NE | |
5929 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
5930 | end if; | |
f937473f | 5931 | |
806f6d37 AC |
5932 | elsif Must_Override (Spec) then |
5933 | if No (Overridden_Operation (Subp)) | |
5934 | and then not Can_Override_Operator (Subp) | |
5935 | then | |
5936 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5937 | end if; | |
5d37ba92 | 5938 | |
806f6d37 AC |
5939 | elsif not Error_Posted (Subp) |
5940 | and then Style_Check | |
5941 | and then Can_Override_Operator (Subp) | |
5942 | and then | |
5943 | not Is_Predefined_File_Name | |
5944 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
5945 | then | |
5946 | -- If style checks are enabled, indicate that the indicator is | |
5947 | -- missing. However, at the point of declaration, the type of | |
5948 | -- which this is a primitive operation may be private, in which | |
5949 | -- case the indicator would be premature. | |
235f4375 | 5950 | |
806f6d37 AC |
5951 | if Has_Private_Declaration (Etype (Subp)) |
5952 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 5953 | then |
806f6d37 AC |
5954 | null; |
5955 | else | |
5956 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 5957 | end if; |
806f6d37 | 5958 | end if; |
21d27997 RD |
5959 | |
5960 | elsif Must_Override (Spec) then | |
5961 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 5962 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 5963 | else |
ed2233dc | 5964 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 5965 | end if; |
5d37ba92 ES |
5966 | |
5967 | -- If the operation is marked "not overriding" and it's not primitive | |
5968 | -- then an error is issued, unless this is an operation of a task or | |
5969 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
5970 | -- has been specified have already been checked above. | |
5971 | ||
5972 | elsif Must_Not_Override (Spec) | |
5973 | and then not Is_Primitive | |
5974 | and then Ekind (Subp) /= E_Entry | |
5975 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5976 | then | |
ed2233dc | 5977 | Error_Msg_N |
5d37ba92 ES |
5978 | ("overriding indicator only allowed if subprogram is primitive", |
5979 | Subp); | |
5d37ba92 | 5980 | return; |
fbf5a39b | 5981 | end if; |
758c442c | 5982 | end Check_Overriding_Indicator; |
fbf5a39b | 5983 | |
996ae0b0 RK |
5984 | ------------------- |
5985 | -- Check_Returns -- | |
5986 | ------------------- | |
5987 | ||
0a36105d JM |
5988 | -- Note: this procedure needs to know far too much about how the expander |
5989 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
5990 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
5991 | -- works, but is not very clean. It would be better if the expansion | |
5992 | -- routines would leave Original_Node working nicely, and we could use | |
5993 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
5994 | ||
996ae0b0 RK |
5995 | procedure Check_Returns |
5996 | (HSS : Node_Id; | |
5997 | Mode : Character; | |
c8ef728f ES |
5998 | Err : out Boolean; |
5999 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
6000 | is |
6001 | Handler : Node_Id; | |
6002 | ||
6003 | procedure Check_Statement_Sequence (L : List_Id); | |
6004 | -- Internal recursive procedure to check a list of statements for proper | |
6005 | -- termination by a return statement (or a transfer of control or a | |
6006 | -- compound statement that is itself internally properly terminated). | |
6007 | ||
6008 | ------------------------------ | |
6009 | -- Check_Statement_Sequence -- | |
6010 | ------------------------------ | |
6011 | ||
6012 | procedure Check_Statement_Sequence (L : List_Id) is | |
6013 | Last_Stm : Node_Id; | |
0a36105d | 6014 | Stm : Node_Id; |
996ae0b0 RK |
6015 | Kind : Node_Kind; |
6016 | ||
7b27e183 AC |
6017 | function Assert_False return Boolean; |
6018 | -- Returns True if Last_Stm is a pragma Assert (False) that has been | |
6019 | -- rewritten as a null statement when assertions are off. The assert | |
6020 | -- is not active, but it is still enough to kill the warning. | |
6021 | ||
6022 | ------------------ | |
6023 | -- Assert_False -- | |
6024 | ------------------ | |
6025 | ||
6026 | function Assert_False return Boolean is | |
6027 | Orig : constant Node_Id := Original_Node (Last_Stm); | |
6028 | ||
6029 | begin | |
6030 | if Nkind (Orig) = N_Pragma | |
6031 | and then Pragma_Name (Orig) = Name_Assert | |
6032 | and then not Error_Posted (Orig) | |
6033 | then | |
6034 | declare | |
6035 | Arg : constant Node_Id := | |
6036 | First (Pragma_Argument_Associations (Orig)); | |
6037 | Exp : constant Node_Id := Expression (Arg); | |
6038 | begin | |
6039 | return Nkind (Exp) = N_Identifier | |
6040 | and then Chars (Exp) = Name_False; | |
6041 | end; | |
6042 | ||
6043 | else | |
6044 | return False; | |
6045 | end if; | |
6046 | end Assert_False; | |
6047 | ||
6048 | -- Local variables | |
6049 | ||
996ae0b0 RK |
6050 | Raise_Exception_Call : Boolean; |
6051 | -- Set True if statement sequence terminated by Raise_Exception call | |
6052 | -- or a Reraise_Occurrence call. | |
6053 | ||
7b27e183 AC |
6054 | -- Start of processing for Check_Statement_Sequence |
6055 | ||
996ae0b0 RK |
6056 | begin |
6057 | Raise_Exception_Call := False; | |
6058 | ||
6059 | -- Get last real statement | |
6060 | ||
6061 | Last_Stm := Last (L); | |
6062 | ||
0a36105d JM |
6063 | -- Deal with digging out exception handler statement sequences that |
6064 | -- have been transformed by the local raise to goto optimization. | |
6065 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
6066 | -- optimization has occurred, we are looking at something like: | |
6067 | ||
6068 | -- begin | |
6069 | -- original stmts in block | |
6070 | ||
6071 | -- exception \ | |
6072 | -- when excep1 => | | |
6073 | -- goto L1; | omitted if No_Exception_Propagation | |
6074 | -- when excep2 => | | |
6075 | -- goto L2; / | |
6076 | -- end; | |
6077 | ||
6078 | -- goto L3; -- skip handler when exception not raised | |
6079 | ||
6080 | -- <<L1>> -- target label for local exception | |
6081 | -- begin | |
6082 | -- estmts1 | |
6083 | -- end; | |
6084 | ||
6085 | -- goto L3; | |
6086 | ||
6087 | -- <<L2>> | |
6088 | -- begin | |
6089 | -- estmts2 | |
6090 | -- end; | |
6091 | ||
6092 | -- <<L3>> | |
6093 | ||
6094 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
6095 | -- sequences (which were the original sequences of statements in | |
6096 | -- the exception handlers) and check them. | |
6097 | ||
8fde064e | 6098 | if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
0a36105d JM |
6099 | Stm := Last_Stm; |
6100 | loop | |
6101 | Prev (Stm); | |
6102 | exit when No (Stm); | |
6103 | exit when Nkind (Stm) /= N_Block_Statement; | |
6104 | exit when not Exception_Junk (Stm); | |
6105 | Prev (Stm); | |
6106 | exit when No (Stm); | |
6107 | exit when Nkind (Stm) /= N_Label; | |
6108 | exit when not Exception_Junk (Stm); | |
6109 | Check_Statement_Sequence | |
6110 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
6111 | ||
6112 | Prev (Stm); | |
6113 | Last_Stm := Stm; | |
6114 | exit when No (Stm); | |
6115 | exit when Nkind (Stm) /= N_Goto_Statement; | |
6116 | exit when not Exception_Junk (Stm); | |
6117 | end loop; | |
6118 | end if; | |
6119 | ||
996ae0b0 RK |
6120 | -- Don't count pragmas |
6121 | ||
6122 | while Nkind (Last_Stm) = N_Pragma | |
6123 | ||
6124 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
6125 | ||
6126 | or else | |
6127 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
6128 | and then | |
6129 | Nkind (Name (Last_Stm)) = N_Identifier | |
6130 | and then | |
6131 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
6132 | ||
6133 | -- Don't count exception junk | |
6134 | ||
6135 | or else | |
800621e0 RD |
6136 | (Nkind_In (Last_Stm, N_Goto_Statement, |
6137 | N_Label, | |
6138 | N_Object_Declaration) | |
8fde064e | 6139 | and then Exception_Junk (Last_Stm)) |
0a36105d JM |
6140 | or else Nkind (Last_Stm) in N_Push_xxx_Label |
6141 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
e3b3266c AC |
6142 | |
6143 | -- Inserted code, such as finalization calls, is irrelevant: we only | |
6144 | -- need to check original source. | |
6145 | ||
6146 | or else Is_Rewrite_Insertion (Last_Stm) | |
996ae0b0 RK |
6147 | loop |
6148 | Prev (Last_Stm); | |
6149 | end loop; | |
6150 | ||
6151 | -- Here we have the "real" last statement | |
6152 | ||
6153 | Kind := Nkind (Last_Stm); | |
6154 | ||
6155 | -- Transfer of control, OK. Note that in the No_Return procedure | |
6156 | -- case, we already diagnosed any explicit return statements, so | |
6157 | -- we can treat them as OK in this context. | |
6158 | ||
6159 | if Is_Transfer (Last_Stm) then | |
6160 | return; | |
6161 | ||
6162 | -- Check cases of explicit non-indirect procedure calls | |
6163 | ||
6164 | elsif Kind = N_Procedure_Call_Statement | |
6165 | and then Is_Entity_Name (Name (Last_Stm)) | |
6166 | then | |
6167 | -- Check call to Raise_Exception procedure which is treated | |
6168 | -- specially, as is a call to Reraise_Occurrence. | |
6169 | ||
6170 | -- We suppress the warning in these cases since it is likely that | |
6171 | -- the programmer really does not expect to deal with the case | |
6172 | -- of Null_Occurrence, and thus would find a warning about a | |
6173 | -- missing return curious, and raising Program_Error does not | |
6174 | -- seem such a bad behavior if this does occur. | |
6175 | ||
c8ef728f ES |
6176 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
6177 | -- behavior will be to raise Constraint_Error (see AI-329). | |
6178 | ||
996ae0b0 RK |
6179 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
6180 | or else | |
6181 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
6182 | then | |
6183 | Raise_Exception_Call := True; | |
6184 | ||
6185 | -- For Raise_Exception call, test first argument, if it is | |
6186 | -- an attribute reference for a 'Identity call, then we know | |
6187 | -- that the call cannot possibly return. | |
6188 | ||
6189 | declare | |
6190 | Arg : constant Node_Id := | |
6191 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
6192 | begin |
6193 | if Nkind (Arg) = N_Attribute_Reference | |
6194 | and then Attribute_Name (Arg) = Name_Identity | |
6195 | then | |
6196 | return; | |
6197 | end if; | |
6198 | end; | |
6199 | end if; | |
6200 | ||
6201 | -- If statement, need to look inside if there is an else and check | |
6202 | -- each constituent statement sequence for proper termination. | |
6203 | ||
6204 | elsif Kind = N_If_Statement | |
6205 | and then Present (Else_Statements (Last_Stm)) | |
6206 | then | |
6207 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
6208 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6209 | ||
6210 | if Present (Elsif_Parts (Last_Stm)) then | |
6211 | declare | |
6212 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
6213 | ||
6214 | begin | |
6215 | while Present (Elsif_Part) loop | |
6216 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
6217 | Next (Elsif_Part); | |
6218 | end loop; | |
6219 | end; | |
6220 | end if; | |
6221 | ||
6222 | return; | |
6223 | ||
6224 | -- Case statement, check each case for proper termination | |
6225 | ||
6226 | elsif Kind = N_Case_Statement then | |
6227 | declare | |
6228 | Case_Alt : Node_Id; | |
996ae0b0 RK |
6229 | begin |
6230 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
6231 | while Present (Case_Alt) loop | |
6232 | Check_Statement_Sequence (Statements (Case_Alt)); | |
6233 | Next_Non_Pragma (Case_Alt); | |
6234 | end loop; | |
6235 | end; | |
6236 | ||
6237 | return; | |
6238 | ||
6239 | -- Block statement, check its handled sequence of statements | |
6240 | ||
6241 | elsif Kind = N_Block_Statement then | |
6242 | declare | |
6243 | Err1 : Boolean; | |
6244 | ||
6245 | begin | |
6246 | Check_Returns | |
6247 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
6248 | ||
6249 | if Err1 then | |
6250 | Err := True; | |
6251 | end if; | |
6252 | ||
6253 | return; | |
6254 | end; | |
6255 | ||
6256 | -- Loop statement. If there is an iteration scheme, we can definitely | |
6257 | -- fall out of the loop. Similarly if there is an exit statement, we | |
6258 | -- can fall out. In either case we need a following return. | |
6259 | ||
6260 | elsif Kind = N_Loop_Statement then | |
6261 | if Present (Iteration_Scheme (Last_Stm)) | |
6262 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
6263 | then | |
6264 | null; | |
6265 | ||
f3d57416 RW |
6266 | -- A loop with no exit statement or iteration scheme is either |
6267 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
6268 | -- In either case, no warning is required. |
6269 | ||
6270 | else | |
6271 | return; | |
6272 | end if; | |
6273 | ||
6274 | -- Timed entry call, check entry call and delay alternatives | |
6275 | ||
6276 | -- Note: in expanded code, the timed entry call has been converted | |
6277 | -- to a set of expanded statements on which the check will work | |
6278 | -- correctly in any case. | |
6279 | ||
6280 | elsif Kind = N_Timed_Entry_Call then | |
6281 | declare | |
6282 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6283 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
6284 | ||
6285 | begin | |
6286 | -- If statement sequence of entry call alternative is missing, | |
6287 | -- then we can definitely fall through, and we post the error | |
6288 | -- message on the entry call alternative itself. | |
6289 | ||
6290 | if No (Statements (ECA)) then | |
6291 | Last_Stm := ECA; | |
6292 | ||
6293 | -- If statement sequence of delay alternative is missing, then | |
6294 | -- we can definitely fall through, and we post the error | |
6295 | -- message on the delay alternative itself. | |
6296 | ||
6297 | -- Note: if both ECA and DCA are missing the return, then we | |
6298 | -- post only one message, should be enough to fix the bugs. | |
6299 | -- If not we will get a message next time on the DCA when the | |
a90bd866 | 6300 | -- ECA is fixed. |
996ae0b0 RK |
6301 | |
6302 | elsif No (Statements (DCA)) then | |
6303 | Last_Stm := DCA; | |
6304 | ||
6305 | -- Else check both statement sequences | |
6306 | ||
6307 | else | |
6308 | Check_Statement_Sequence (Statements (ECA)); | |
6309 | Check_Statement_Sequence (Statements (DCA)); | |
6310 | return; | |
6311 | end if; | |
6312 | end; | |
6313 | ||
6314 | -- Conditional entry call, check entry call and else part | |
6315 | ||
6316 | -- Note: in expanded code, the conditional entry call has been | |
6317 | -- converted to a set of expanded statements on which the check | |
6318 | -- will work correctly in any case. | |
6319 | ||
6320 | elsif Kind = N_Conditional_Entry_Call then | |
6321 | declare | |
6322 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6323 | ||
6324 | begin | |
6325 | -- If statement sequence of entry call alternative is missing, | |
6326 | -- then we can definitely fall through, and we post the error | |
6327 | -- message on the entry call alternative itself. | |
6328 | ||
6329 | if No (Statements (ECA)) then | |
6330 | Last_Stm := ECA; | |
6331 | ||
6332 | -- Else check statement sequence and else part | |
6333 | ||
6334 | else | |
6335 | Check_Statement_Sequence (Statements (ECA)); | |
6336 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6337 | return; | |
6338 | end if; | |
6339 | end; | |
6340 | end if; | |
6341 | ||
6342 | -- If we fall through, issue appropriate message | |
6343 | ||
6344 | if Mode = 'F' then | |
7b27e183 AC |
6345 | |
6346 | -- Kill warning if last statement is a raise exception call, | |
6347 | -- or a pragma Assert (False). Note that with assertions enabled, | |
6348 | -- such a pragma has been converted into a raise exception call | |
6349 | -- already, so the Assert_False is for the assertions off case. | |
6350 | ||
6351 | if not Raise_Exception_Call and then not Assert_False then | |
b465ef6f AC |
6352 | |
6353 | -- In GNATprove mode, it is an error to have a missing return | |
6354 | ||
43417b90 | 6355 | Error_Msg_Warn := SPARK_Mode /= On; |
7b27e183 AC |
6356 | |
6357 | -- Issue error message or warning | |
6358 | ||
4a28b181 AC |
6359 | Error_Msg_N |
6360 | ("RETURN statement missing following this statement<<!", | |
6361 | Last_Stm); | |
6362 | Error_Msg_N | |
6363 | ("\Program_Error ]<<!", Last_Stm); | |
996ae0b0 RK |
6364 | end if; |
6365 | ||
6366 | -- Note: we set Err even though we have not issued a warning | |
6367 | -- because we still have a case of a missing return. This is | |
6368 | -- an extremely marginal case, probably will never be noticed | |
6369 | -- but we might as well get it right. | |
6370 | ||
6371 | Err := True; | |
6372 | ||
c8ef728f ES |
6373 | -- Otherwise we have the case of a procedure marked No_Return |
6374 | ||
996ae0b0 | 6375 | else |
800621e0 | 6376 | if not Raise_Exception_Call then |
4a28b181 AC |
6377 | if GNATprove_Mode then |
6378 | Error_Msg_N | |
6379 | ("implied return after this statement " | |
6380 | & "would have raised Program_Error", Last_Stm); | |
6381 | else | |
6382 | Error_Msg_N | |
6383 | ("implied return after this statement " | |
6384 | & "will raise Program_Error??", Last_Stm); | |
6385 | end if; | |
6386 | ||
43417b90 | 6387 | Error_Msg_Warn := SPARK_Mode /= On; |
800621e0 | 6388 | Error_Msg_NE |
4a28b181 | 6389 | ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
800621e0 | 6390 | end if; |
c8ef728f ES |
6391 | |
6392 | declare | |
6393 | RE : constant Node_Id := | |
6394 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
6395 | Reason => PE_Implicit_Return); | |
6396 | begin | |
6397 | Insert_After (Last_Stm, RE); | |
6398 | Analyze (RE); | |
6399 | end; | |
996ae0b0 RK |
6400 | end if; |
6401 | end Check_Statement_Sequence; | |
6402 | ||
6403 | -- Start of processing for Check_Returns | |
6404 | ||
6405 | begin | |
6406 | Err := False; | |
6407 | Check_Statement_Sequence (Statements (HSS)); | |
6408 | ||
6409 | if Present (Exception_Handlers (HSS)) then | |
6410 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
6411 | while Present (Handler) loop | |
6412 | Check_Statement_Sequence (Statements (Handler)); | |
6413 | Next_Non_Pragma (Handler); | |
6414 | end loop; | |
6415 | end if; | |
6416 | end Check_Returns; | |
6417 | ||
6418 | ---------------------------- | |
6419 | -- Check_Subprogram_Order -- | |
6420 | ---------------------------- | |
6421 | ||
6422 | procedure Check_Subprogram_Order (N : Node_Id) is | |
6423 | ||
6424 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
6425 | -- This is used to check if S1 > S2 in the sense required by this test, |
6426 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 6427 | |
82c80734 RD |
6428 | ----------------------------- |
6429 | -- Subprogram_Name_Greater -- | |
6430 | ----------------------------- | |
6431 | ||
996ae0b0 RK |
6432 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
6433 | L1, L2 : Positive; | |
6434 | N1, N2 : Natural; | |
6435 | ||
6436 | begin | |
67336960 AC |
6437 | -- Deal with special case where names are identical except for a |
6438 | -- numerical suffix. These are handled specially, taking the numeric | |
6439 | -- ordering from the suffix into account. | |
996ae0b0 RK |
6440 | |
6441 | L1 := S1'Last; | |
6442 | while S1 (L1) in '0' .. '9' loop | |
6443 | L1 := L1 - 1; | |
6444 | end loop; | |
6445 | ||
6446 | L2 := S2'Last; | |
6447 | while S2 (L2) in '0' .. '9' loop | |
6448 | L2 := L2 - 1; | |
6449 | end loop; | |
6450 | ||
67336960 | 6451 | -- If non-numeric parts non-equal, do straight compare |
996ae0b0 | 6452 | |
67336960 AC |
6453 | if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
6454 | return S1 > S2; | |
996ae0b0 RK |
6455 | |
6456 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
6457 | -- that a missing suffix is treated as numeric zero in this test. | |
6458 | ||
6459 | else | |
6460 | N1 := 0; | |
6461 | while L1 < S1'Last loop | |
6462 | L1 := L1 + 1; | |
6463 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
6464 | end loop; | |
6465 | ||
6466 | N2 := 0; | |
6467 | while L2 < S2'Last loop | |
6468 | L2 := L2 + 1; | |
6469 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
6470 | end loop; | |
6471 | ||
6472 | return N1 > N2; | |
6473 | end if; | |
6474 | end Subprogram_Name_Greater; | |
6475 | ||
6476 | -- Start of processing for Check_Subprogram_Order | |
6477 | ||
6478 | begin | |
6479 | -- Check body in alpha order if this is option | |
6480 | ||
fbf5a39b | 6481 | if Style_Check |
bc202b70 | 6482 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
6483 | and then Nkind (N) = N_Subprogram_Body |
6484 | and then Comes_From_Source (N) | |
6485 | and then In_Extended_Main_Source_Unit (N) | |
6486 | then | |
6487 | declare | |
6488 | LSN : String_Ptr | |
6489 | renames Scope_Stack.Table | |
6490 | (Scope_Stack.Last).Last_Subprogram_Name; | |
6491 | ||
6492 | Body_Id : constant Entity_Id := | |
6493 | Defining_Entity (Specification (N)); | |
6494 | ||
6495 | begin | |
6496 | Get_Decoded_Name_String (Chars (Body_Id)); | |
6497 | ||
6498 | if LSN /= null then | |
6499 | if Subprogram_Name_Greater | |
6500 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
6501 | then | |
6502 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
6503 | end if; | |
6504 | ||
6505 | Free (LSN); | |
6506 | end if; | |
6507 | ||
6508 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
6509 | end; | |
6510 | end if; | |
6511 | end Check_Subprogram_Order; | |
6512 | ||
6513 | ------------------------------ | |
6514 | -- Check_Subtype_Conformant -- | |
6515 | ------------------------------ | |
6516 | ||
6517 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
6518 | (New_Id : Entity_Id; |
6519 | Old_Id : Entity_Id; | |
6520 | Err_Loc : Node_Id := Empty; | |
f307415a AC |
6521 | Skip_Controlling_Formals : Boolean := False; |
6522 | Get_Inst : Boolean := False) | |
996ae0b0 RK |
6523 | is |
6524 | Result : Boolean; | |
81db9d77 | 6525 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6526 | begin |
6527 | Check_Conformance | |
ce2b6ba5 | 6528 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
f307415a AC |
6529 | Skip_Controlling_Formals => Skip_Controlling_Formals, |
6530 | Get_Inst => Get_Inst); | |
996ae0b0 RK |
6531 | end Check_Subtype_Conformant; |
6532 | ||
6533 | --------------------------- | |
6534 | -- Check_Type_Conformant -- | |
6535 | --------------------------- | |
6536 | ||
6537 | procedure Check_Type_Conformant | |
6538 | (New_Id : Entity_Id; | |
6539 | Old_Id : Entity_Id; | |
6540 | Err_Loc : Node_Id := Empty) | |
6541 | is | |
6542 | Result : Boolean; | |
81db9d77 | 6543 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6544 | begin |
6545 | Check_Conformance | |
6546 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
6547 | end Check_Type_Conformant; | |
6548 | ||
806f6d37 AC |
6549 | --------------------------- |
6550 | -- Can_Override_Operator -- | |
6551 | --------------------------- | |
6552 | ||
6553 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
6554 | Typ : Entity_Id; | |
f146302c | 6555 | |
806f6d37 AC |
6556 | begin |
6557 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
6558 | return False; | |
6559 | ||
6560 | else | |
6561 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
6562 | ||
f146302c AC |
6563 | -- Check explicitly that the operation is a primitive of the type |
6564 | ||
806f6d37 | 6565 | return Operator_Matches_Spec (Subp, Subp) |
f146302c | 6566 | and then not Is_Generic_Type (Typ) |
806f6d37 AC |
6567 | and then Scope (Subp) = Scope (Typ) |
6568 | and then not Is_Class_Wide_Type (Typ); | |
6569 | end if; | |
6570 | end Can_Override_Operator; | |
6571 | ||
996ae0b0 RK |
6572 | ---------------------- |
6573 | -- Conforming_Types -- | |
6574 | ---------------------- | |
6575 | ||
6576 | function Conforming_Types | |
6577 | (T1 : Entity_Id; | |
6578 | T2 : Entity_Id; | |
6579 | Ctype : Conformance_Type; | |
d05ef0ab | 6580 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
6581 | is |
6582 | Type_1 : Entity_Id := T1; | |
6583 | Type_2 : Entity_Id := T2; | |
af4b9434 | 6584 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
6585 | |
6586 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
6587 | -- If neither T1 nor T2 are generic actual types, or if they are in |
6588 | -- different scopes (e.g. parent and child instances), then verify that | |
6589 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
6590 | -- subtype chain. The whole purpose of this procedure is to prevent | |
6591 | -- spurious ambiguities in an instantiation that may arise if two | |
6592 | -- distinct generic types are instantiated with the same actual. | |
6593 | ||
5d37ba92 ES |
6594 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
6595 | -- An access parameter can designate an incomplete type. If the | |
6596 | -- incomplete type is the limited view of a type from a limited_ | |
6597 | -- with_clause, check whether the non-limited view is available. If | |
6598 | -- it is a (non-limited) incomplete type, get the full view. | |
6599 | ||
0a36105d JM |
6600 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
6601 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
6602 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
6603 | -- with view of a type is used in a subprogram declaration and the | |
6604 | -- subprogram body is in the scope of a regular with clause for the | |
6605 | -- same unit. In such a case, the two type entities can be considered | |
6606 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
6607 | |
6608 | ---------------------- | |
6609 | -- Base_Types_Match -- | |
6610 | ---------------------- | |
6611 | ||
6612 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
8fde064e AC |
6613 | BT1 : constant Entity_Id := Base_Type (T1); |
6614 | BT2 : constant Entity_Id := Base_Type (T2); | |
6615 | ||
996ae0b0 RK |
6616 | begin |
6617 | if T1 = T2 then | |
6618 | return True; | |
6619 | ||
8fde064e | 6620 | elsif BT1 = BT2 then |
996ae0b0 | 6621 | |
0a36105d | 6622 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
6623 | -- check that the generic actual is an ancestor subtype of the |
6624 | -- other ???. | |
586ecbf3 | 6625 | |
70f4ad20 AC |
6626 | -- See code in Find_Corresponding_Spec that applies an additional |
6627 | -- filter to handle accidental amiguities in instances. | |
996ae0b0 RK |
6628 | |
6629 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
6630 | or else not Is_Generic_Actual_Type (T2) |
6631 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 6632 | |
8fde064e | 6633 | -- If T2 is a generic actual type it is declared as the subtype of |
2995860f AC |
6634 | -- the actual. If that actual is itself a subtype we need to use its |
6635 | -- own base type to check for compatibility. | |
8fde064e AC |
6636 | |
6637 | elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then | |
6638 | return True; | |
6639 | ||
6640 | elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then | |
6641 | return True; | |
6642 | ||
0a36105d JM |
6643 | else |
6644 | return False; | |
6645 | end if; | |
6646 | end Base_Types_Match; | |
aa720a54 | 6647 | |
5d37ba92 ES |
6648 | -------------------------- |
6649 | -- Find_Designated_Type -- | |
6650 | -------------------------- | |
6651 | ||
6652 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
6653 | Desig : Entity_Id; | |
6654 | ||
6655 | begin | |
6656 | Desig := Directly_Designated_Type (T); | |
6657 | ||
6658 | if Ekind (Desig) = E_Incomplete_Type then | |
6659 | ||
6660 | -- If regular incomplete type, get full view if available | |
6661 | ||
6662 | if Present (Full_View (Desig)) then | |
6663 | Desig := Full_View (Desig); | |
6664 | ||
6665 | -- If limited view of a type, get non-limited view if available, | |
6666 | -- and check again for a regular incomplete type. | |
6667 | ||
6668 | elsif Present (Non_Limited_View (Desig)) then | |
6669 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
6670 | end if; | |
6671 | end if; | |
6672 | ||
6673 | return Desig; | |
6674 | end Find_Designated_Type; | |
6675 | ||
0a36105d JM |
6676 | ------------------------------- |
6677 | -- Matches_Limited_With_View -- | |
6678 | ------------------------------- | |
6679 | ||
6680 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
6681 | begin | |
6682 | -- In some cases a type imported through a limited_with clause, and | |
6683 | -- its nonlimited view are both visible, for example in an anonymous | |
28fa5430 AC |
6684 | -- access-to-class-wide type in a formal, or when building the body |
6685 | -- for a subprogram renaming after the subprogram has been frozen. | |
6686 | -- In these cases Both entities designate the same type. In addition, | |
6687 | -- if one of them is an actual in an instance, it may be a subtype of | |
6688 | -- the non-limited view of the other. | |
6689 | ||
6690 | if From_Limited_With (T1) | |
6691 | and then (T2 = Available_View (T1) | |
6692 | or else Is_Subtype_Of (T2, Available_View (T1))) | |
6693 | then | |
aa720a54 AC |
6694 | return True; |
6695 | ||
28fa5430 AC |
6696 | elsif From_Limited_With (T2) |
6697 | and then (T1 = Available_View (T2) | |
6698 | or else Is_Subtype_Of (T1, Available_View (T2))) | |
6699 | then | |
41251c60 | 6700 | return True; |
3e24afaa | 6701 | |
7b56a91b AC |
6702 | elsif From_Limited_With (T1) |
6703 | and then From_Limited_With (T2) | |
3e24afaa AC |
6704 | and then Available_View (T1) = Available_View (T2) |
6705 | then | |
6706 | return True; | |
41251c60 | 6707 | |
996ae0b0 RK |
6708 | else |
6709 | return False; | |
6710 | end if; | |
0a36105d | 6711 | end Matches_Limited_With_View; |
996ae0b0 | 6712 | |
ec4867fa | 6713 | -- Start of processing for Conforming_Types |
758c442c | 6714 | |
996ae0b0 | 6715 | begin |
8fde064e AC |
6716 | -- The context is an instance association for a formal access-to- |
6717 | -- subprogram type; the formal parameter types require mapping because | |
6718 | -- they may denote other formal parameters of the generic unit. | |
996ae0b0 RK |
6719 | |
6720 | if Get_Inst then | |
6721 | Type_1 := Get_Instance_Of (T1); | |
6722 | Type_2 := Get_Instance_Of (T2); | |
6723 | end if; | |
6724 | ||
0a36105d JM |
6725 | -- If one of the types is a view of the other introduced by a limited |
6726 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 6727 | |
0a36105d JM |
6728 | if Matches_Limited_With_View (T1, T2) then |
6729 | return True; | |
6730 | ||
6731 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
6732 | return Ctype <= Mode_Conformant |
6733 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
6734 | ||
6735 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
6736 | and then Present (Full_View (Type_1)) | |
6737 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
6738 | then | |
6739 | return Ctype <= Mode_Conformant | |
6740 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
6741 | ||
6742 | elsif Ekind (Type_2) = E_Incomplete_Type | |
6743 | and then Present (Full_View (Type_2)) | |
6744 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6745 | then | |
6746 | return Ctype <= Mode_Conformant | |
6747 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
6748 | |
6749 | elsif Is_Private_Type (Type_2) | |
6750 | and then In_Instance | |
6751 | and then Present (Full_View (Type_2)) | |
6752 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6753 | then | |
6754 | return Ctype <= Mode_Conformant | |
6755 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
996ae0b0 RK |
6756 | end if; |
6757 | ||
0a36105d | 6758 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
466c2127 AC |
6759 | -- treated recursively because they carry a signature. As far as |
6760 | -- conformance is concerned, convention plays no role, and either | |
6761 | -- or both could be access to protected subprograms. | |
af4b9434 AC |
6762 | |
6763 | Are_Anonymous_Access_To_Subprogram_Types := | |
466c2127 AC |
6764 | Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
6765 | E_Anonymous_Access_Protected_Subprogram_Type) | |
f937473f | 6766 | and then |
466c2127 AC |
6767 | Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
6768 | E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 6769 | |
996ae0b0 | 6770 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
6771 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
6772 | -- the base types because we may have built internal subtype entities | |
6773 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 6774 | |
5d37ba92 ES |
6775 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
6776 | and then | |
6777 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
8fde064e AC |
6778 | |
6779 | -- Ada 2005 (AI-254) | |
6780 | ||
6781 | or else Are_Anonymous_Access_To_Subprogram_Types | |
996ae0b0 RK |
6782 | then |
6783 | declare | |
6784 | Desig_1 : Entity_Id; | |
6785 | Desig_2 : Entity_Id; | |
6786 | ||
6787 | begin | |
885c4871 | 6788 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 6789 | -- subtype conformance. |
9dcb52e1 | 6790 | |
0791fbe9 | 6791 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
6792 | and then Ctype >= Subtype_Conformant |
6793 | and then | |
6794 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
6795 | then | |
6796 | return False; | |
996ae0b0 RK |
6797 | end if; |
6798 | ||
5d37ba92 | 6799 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 6800 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 6801 | |
5d37ba92 | 6802 | -- If the context is an instance association for a formal |
82c80734 RD |
6803 | -- access-to-subprogram type; formal access parameter designated |
6804 | -- types require mapping because they may denote other formal | |
6805 | -- parameters of the generic unit. | |
996ae0b0 RK |
6806 | |
6807 | if Get_Inst then | |
6808 | Desig_1 := Get_Instance_Of (Desig_1); | |
6809 | Desig_2 := Get_Instance_Of (Desig_2); | |
6810 | end if; | |
6811 | ||
82c80734 RD |
6812 | -- It is possible for a Class_Wide_Type to be introduced for an |
6813 | -- incomplete type, in which case there is a separate class_ wide | |
6814 | -- type for the full view. The types conform if their Etypes | |
6815 | -- conform, i.e. one may be the full view of the other. This can | |
6816 | -- only happen in the context of an access parameter, other uses | |
6817 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 6818 | |
fbf5a39b | 6819 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
6820 | and then |
6821 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
6822 | then |
6823 | return | |
fbf5a39b AC |
6824 | Conforming_Types |
6825 | (Etype (Base_Type (Desig_1)), | |
6826 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
6827 | |
6828 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 6829 | if Ada_Version < Ada_2005 then |
758c442c GD |
6830 | return Ctype = Type_Conformant |
6831 | or else | |
af4b9434 AC |
6832 | Subtypes_Statically_Match (Desig_1, Desig_2); |
6833 | ||
758c442c GD |
6834 | -- We must check the conformance of the signatures themselves |
6835 | ||
6836 | else | |
6837 | declare | |
6838 | Conformant : Boolean; | |
6839 | begin | |
6840 | Check_Conformance | |
6841 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
6842 | return Conformant; | |
6843 | end; | |
6844 | end if; | |
6845 | ||
996ae0b0 RK |
6846 | else |
6847 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
6848 | and then (Ctype = Type_Conformant | |
8fde064e AC |
6849 | or else |
6850 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
6851 | end if; |
6852 | end; | |
6853 | ||
6854 | -- Otherwise definitely no match | |
6855 | ||
6856 | else | |
c8ef728f ES |
6857 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
6858 | and then Is_Access_Type (Type_2)) | |
6859 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
8fde064e | 6860 | and then Is_Access_Type (Type_1))) |
c8ef728f ES |
6861 | and then |
6862 | Conforming_Types | |
6863 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
6864 | then | |
6865 | May_Hide_Profile := True; | |
6866 | end if; | |
6867 | ||
996ae0b0 RK |
6868 | return False; |
6869 | end if; | |
996ae0b0 RK |
6870 | end Conforming_Types; |
6871 | ||
6872 | -------------------------- | |
6873 | -- Create_Extra_Formals -- | |
6874 | -------------------------- | |
6875 | ||
6876 | procedure Create_Extra_Formals (E : Entity_Id) is | |
6877 | Formal : Entity_Id; | |
ec4867fa | 6878 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
6879 | Last_Extra : Entity_Id; |
6880 | Formal_Type : Entity_Id; | |
6881 | P_Formal : Entity_Id := Empty; | |
6882 | ||
ec4867fa ES |
6883 | function Add_Extra_Formal |
6884 | (Assoc_Entity : Entity_Id; | |
6885 | Typ : Entity_Id; | |
6886 | Scope : Entity_Id; | |
6887 | Suffix : String) return Entity_Id; | |
6888 | -- Add an extra formal to the current list of formals and extra formals. | |
6889 | -- The extra formal is added to the end of the list of extra formals, | |
6890 | -- and also returned as the result. These formals are always of mode IN. | |
6891 | -- The new formal has the type Typ, is declared in Scope, and its name | |
6892 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
6893 | -- The following suffixes are currently used. They should not be changed |
6894 | -- without coordinating with CodePeer, which makes use of these to | |
6895 | -- provide better messages. | |
6896 | ||
d92eccc3 AC |
6897 | -- O denotes the Constrained bit. |
6898 | -- L denotes the accessibility level. | |
cd5a9750 AC |
6899 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
6900 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 6901 | |
fbf5a39b AC |
6902 | ---------------------- |
6903 | -- Add_Extra_Formal -- | |
6904 | ---------------------- | |
6905 | ||
ec4867fa ES |
6906 | function Add_Extra_Formal |
6907 | (Assoc_Entity : Entity_Id; | |
6908 | Typ : Entity_Id; | |
6909 | Scope : Entity_Id; | |
6910 | Suffix : String) return Entity_Id | |
6911 | is | |
996ae0b0 | 6912 | EF : constant Entity_Id := |
ec4867fa ES |
6913 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
6914 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 6915 | Suffix => Suffix)); |
996ae0b0 RK |
6916 | |
6917 | begin | |
82c80734 RD |
6918 | -- A little optimization. Never generate an extra formal for the |
6919 | -- _init operand of an initialization procedure, since it could | |
6920 | -- never be used. | |
996ae0b0 RK |
6921 | |
6922 | if Chars (Formal) = Name_uInit then | |
6923 | return Empty; | |
6924 | end if; | |
6925 | ||
6926 | Set_Ekind (EF, E_In_Parameter); | |
6927 | Set_Actual_Subtype (EF, Typ); | |
6928 | Set_Etype (EF, Typ); | |
ec4867fa | 6929 | Set_Scope (EF, Scope); |
996ae0b0 RK |
6930 | Set_Mechanism (EF, Default_Mechanism); |
6931 | Set_Formal_Validity (EF); | |
6932 | ||
ec4867fa ES |
6933 | if No (First_Extra) then |
6934 | First_Extra := EF; | |
6935 | Set_Extra_Formals (Scope, First_Extra); | |
6936 | end if; | |
6937 | ||
6938 | if Present (Last_Extra) then | |
6939 | Set_Extra_Formal (Last_Extra, EF); | |
6940 | end if; | |
6941 | ||
996ae0b0 | 6942 | Last_Extra := EF; |
ec4867fa | 6943 | |
996ae0b0 RK |
6944 | return EF; |
6945 | end Add_Extra_Formal; | |
6946 | ||
6947 | -- Start of processing for Create_Extra_Formals | |
6948 | ||
6949 | begin | |
8fde064e AC |
6950 | -- We never generate extra formals if expansion is not active because we |
6951 | -- don't need them unless we are generating code. | |
f937473f RD |
6952 | |
6953 | if not Expander_Active then | |
6954 | return; | |
6955 | end if; | |
6956 | ||
e2441021 AC |
6957 | -- No need to generate extra formals in interface thunks whose target |
6958 | -- primitive has no extra formals. | |
6959 | ||
6960 | if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then | |
6961 | return; | |
6962 | end if; | |
6963 | ||
82c80734 | 6964 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 6965 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 6966 | -- for extra formals. |
996ae0b0 RK |
6967 | |
6968 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
6969 | P_Formal := First_Formal (Alias (E)); | |
6970 | end if; | |
6971 | ||
6972 | Last_Extra := Empty; | |
6973 | Formal := First_Formal (E); | |
6974 | while Present (Formal) loop | |
6975 | Last_Extra := Formal; | |
6976 | Next_Formal (Formal); | |
6977 | end loop; | |
6978 | ||
f937473f | 6979 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
6980 | -- situation may arise for subprogram types created as part of |
6981 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 | 6982 | |
8fde064e | 6983 | if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
996ae0b0 RK |
6984 | return; |
6985 | end if; | |
6986 | ||
19590d70 GD |
6987 | -- If the subprogram is a predefined dispatching subprogram then don't |
6988 | -- generate any extra constrained or accessibility level formals. In | |
6989 | -- general we suppress these for internal subprograms (by not calling | |
6990 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
6991 | -- generated stream attributes do get passed through because extra | |
6992 | -- build-in-place formals are needed in some cases (limited 'Input). | |
6993 | ||
bac7206d | 6994 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 6995 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
6996 | end if; |
6997 | ||
996ae0b0 | 6998 | Formal := First_Formal (E); |
996ae0b0 RK |
6999 | while Present (Formal) loop |
7000 | ||
7001 | -- Create extra formal for supporting the attribute 'Constrained. | |
7002 | -- The case of a private type view without discriminants also | |
7003 | -- requires the extra formal if the underlying type has defaulted | |
7004 | -- discriminants. | |
7005 | ||
7006 | if Ekind (Formal) /= E_In_Parameter then | |
7007 | if Present (P_Formal) then | |
7008 | Formal_Type := Etype (P_Formal); | |
7009 | else | |
7010 | Formal_Type := Etype (Formal); | |
7011 | end if; | |
7012 | ||
5d09245e AC |
7013 | -- Do not produce extra formals for Unchecked_Union parameters. |
7014 | -- Jump directly to the end of the loop. | |
7015 | ||
7016 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
7017 | goto Skip_Extra_Formal_Generation; | |
7018 | end if; | |
7019 | ||
996ae0b0 RK |
7020 | if not Has_Discriminants (Formal_Type) |
7021 | and then Ekind (Formal_Type) in Private_Kind | |
7022 | and then Present (Underlying_Type (Formal_Type)) | |
7023 | then | |
7024 | Formal_Type := Underlying_Type (Formal_Type); | |
7025 | end if; | |
7026 | ||
5e5db3b4 GD |
7027 | -- Suppress the extra formal if formal's subtype is constrained or |
7028 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
7029 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
7030 | -- can have defaulted discriminants, but 'Constrained is required | |
7031 | -- to return True, so the formal is never needed (see AI05-0214). | |
7032 | -- Note that this ensures consistency of calling sequences for | |
7033 | -- dispatching operations when some types in a class have defaults | |
7034 | -- on discriminants and others do not (and requiring the extra | |
7035 | -- formal would introduce distributed overhead). | |
7036 | ||
b5bdffcc AC |
7037 | -- If the type does not have a completion yet, treat as prior to |
7038 | -- Ada 2012 for consistency. | |
7039 | ||
996ae0b0 | 7040 | if Has_Discriminants (Formal_Type) |
f937473f RD |
7041 | and then not Is_Constrained (Formal_Type) |
7042 | and then not Is_Indefinite_Subtype (Formal_Type) | |
5e5db3b4 | 7043 | and then (Ada_Version < Ada_2012 |
b5bdffcc AC |
7044 | or else No (Underlying_Type (Formal_Type)) |
7045 | or else not | |
7046 | (Is_Limited_Type (Formal_Type) | |
7047 | and then | |
7048 | (Is_Tagged_Type | |
7049 | (Underlying_Type (Formal_Type))))) | |
996ae0b0 RK |
7050 | then |
7051 | Set_Extra_Constrained | |
d92eccc3 | 7052 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
7053 | end if; |
7054 | end if; | |
7055 | ||
0a36105d JM |
7056 | -- Create extra formal for supporting accessibility checking. This |
7057 | -- is done for both anonymous access formals and formals of named | |
7058 | -- access types that are marked as controlling formals. The latter | |
7059 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
7060 | -- type and substitutes the types of access-to-class-wide actuals | |
7061 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
7062 | -- Base_Type is applied because in cases where there is a null |
7063 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
7064 | |
7065 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 7066 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
7067 | -- package in which it resides. However, we do not suppress it |
7068 | -- simply if the scope has accessibility checks suppressed, since | |
7069 | -- this could cause trouble when clients are compiled with a | |
7070 | -- different suppression setting. The explicit checks at the | |
7071 | -- package level are safe from this point of view. | |
996ae0b0 | 7072 | |
5d37ba92 | 7073 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 7074 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 7075 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 7076 | and then not |
fbf5a39b | 7077 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 7078 | or else |
fbf5a39b | 7079 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 7080 | and then |
c8ef728f | 7081 | (No (P_Formal) |
996ae0b0 RK |
7082 | or else Present (Extra_Accessibility (P_Formal))) |
7083 | then | |
811c6a85 | 7084 | Set_Extra_Accessibility |
d92eccc3 | 7085 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
7086 | end if; |
7087 | ||
5d09245e AC |
7088 | -- This label is required when skipping extra formal generation for |
7089 | -- Unchecked_Union parameters. | |
7090 | ||
7091 | <<Skip_Extra_Formal_Generation>> | |
7092 | ||
f937473f RD |
7093 | if Present (P_Formal) then |
7094 | Next_Formal (P_Formal); | |
7095 | end if; | |
7096 | ||
996ae0b0 RK |
7097 | Next_Formal (Formal); |
7098 | end loop; | |
ec4867fa | 7099 | |
63585f75 SB |
7100 | <<Test_For_Func_Result_Extras>> |
7101 | ||
7102 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
7103 | -- function call is ... determined by the point of call ...". | |
7104 | ||
7105 | if Needs_Result_Accessibility_Level (E) then | |
7106 | Set_Extra_Accessibility_Of_Result | |
7107 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
7108 | end if; | |
19590d70 | 7109 | |
ec4867fa | 7110 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
7111 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
7112 | ||
0791fbe9 | 7113 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 7114 | declare |
f937473f | 7115 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 7116 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 7117 | Formal_Typ : Entity_Id; |
f937473f | 7118 | |
2fcc44fa | 7119 | Discard : Entity_Id; |
f937473f | 7120 | pragma Warnings (Off, Discard); |
ec4867fa ES |
7121 | |
7122 | begin | |
f937473f | 7123 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
7124 | -- add a 4-state formal indicating whether the return object is |
7125 | -- allocated by the caller (1), or should be allocated by the | |
7126 | -- callee on the secondary stack (2), in the global heap (3), or | |
7127 | -- in a user-defined storage pool (4). For the moment we just use | |
7128 | -- Natural for the type of this formal. Note that this formal | |
7129 | -- isn't usually needed in the case where the result subtype is | |
7130 | -- constrained, but it is needed when the function has a tagged | |
7131 | -- result, because generally such functions can be called in a | |
7132 | -- dispatching context and such calls must be handled like calls | |
7133 | -- to a class-wide function. | |
0a36105d | 7134 | |
1bb6e262 | 7135 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
7136 | Discard := |
7137 | Add_Extra_Formal | |
7138 | (E, Standard_Natural, | |
7139 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 7140 | |
8417f4b2 | 7141 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 AC |
7142 | -- use a user-defined pool. This formal is not added on |
7143 | -- .NET/JVM/ZFP as those targets do not support pools. | |
200b7162 | 7144 | |
ea10ca9c AC |
7145 | if VM_Target = No_VM |
7146 | and then RTE_Available (RE_Root_Storage_Pool_Ptr) | |
3e452820 | 7147 | then |
8417f4b2 AC |
7148 | Discard := |
7149 | Add_Extra_Formal | |
7150 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
7151 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
7152 | end if; | |
f937473f | 7153 | end if; |
ec4867fa | 7154 | |
df3e68b1 | 7155 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 7156 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 7157 | |
ca5af305 | 7158 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
7159 | Discard := |
7160 | Add_Extra_Formal | |
ca5af305 AC |
7161 | (E, RTE (RE_Finalization_Master_Ptr), |
7162 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
7163 | end if; |
7164 | ||
94bbf008 AC |
7165 | -- When the result type contains tasks, add two extra formals: the |
7166 | -- master of the tasks to be created, and the caller's activation | |
7167 | -- chain. | |
f937473f | 7168 | |
1a36a0cd | 7169 | if Has_Task (Full_Subt) then |
f937473f RD |
7170 | Discard := |
7171 | Add_Extra_Formal | |
7172 | (E, RTE (RE_Master_Id), | |
af89615f | 7173 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
7174 | Discard := |
7175 | Add_Extra_Formal | |
7176 | (E, RTE (RE_Activation_Chain_Access), | |
7177 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
7178 | end if; | |
ec4867fa | 7179 | |
f937473f RD |
7180 | -- All build-in-place functions get an extra formal that will be |
7181 | -- passed the address of the return object within the caller. | |
ec4867fa | 7182 | |
1a36a0cd AC |
7183 | Formal_Typ := |
7184 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 7185 | |
1a36a0cd AC |
7186 | Set_Directly_Designated_Type (Formal_Typ, Result_Subt); |
7187 | Set_Etype (Formal_Typ, Formal_Typ); | |
7188 | Set_Depends_On_Private | |
7189 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
7190 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
7191 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 7192 | |
1a36a0cd AC |
7193 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
7194 | -- the designated type comes from the limited view (for back-end | |
7195 | -- purposes). | |
ec4867fa | 7196 | |
7b56a91b AC |
7197 | Set_From_Limited_With |
7198 | (Formal_Typ, From_Limited_With (Result_Subt)); | |
f937473f | 7199 | |
1a36a0cd AC |
7200 | Layout_Type (Formal_Typ); |
7201 | ||
7202 | Discard := | |
7203 | Add_Extra_Formal | |
7204 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
7205 | end; |
7206 | end if; | |
996ae0b0 RK |
7207 | end Create_Extra_Formals; |
7208 | ||
7209 | ----------------------------- | |
7210 | -- Enter_Overloaded_Entity -- | |
7211 | ----------------------------- | |
7212 | ||
7213 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
7214 | E : Entity_Id := Current_Entity_In_Scope (S); | |
7215 | C_E : Entity_Id := Current_Entity (S); | |
7216 | ||
7217 | begin | |
7218 | if Present (E) then | |
7219 | Set_Has_Homonym (E); | |
7220 | Set_Has_Homonym (S); | |
7221 | end if; | |
7222 | ||
7223 | Set_Is_Immediately_Visible (S); | |
7224 | Set_Scope (S, Current_Scope); | |
7225 | ||
7226 | -- Chain new entity if front of homonym in current scope, so that | |
7227 | -- homonyms are contiguous. | |
7228 | ||
8fde064e | 7229 | if Present (E) and then E /= C_E then |
996ae0b0 RK |
7230 | while Homonym (C_E) /= E loop |
7231 | C_E := Homonym (C_E); | |
7232 | end loop; | |
7233 | ||
7234 | Set_Homonym (C_E, S); | |
7235 | ||
7236 | else | |
7237 | E := C_E; | |
7238 | Set_Current_Entity (S); | |
7239 | end if; | |
7240 | ||
7241 | Set_Homonym (S, E); | |
7242 | ||
2352eadb AC |
7243 | if Is_Inherited_Operation (S) then |
7244 | Append_Inherited_Subprogram (S); | |
7245 | else | |
7246 | Append_Entity (S, Current_Scope); | |
7247 | end if; | |
7248 | ||
996ae0b0 RK |
7249 | Set_Public_Status (S); |
7250 | ||
7251 | if Debug_Flag_E then | |
7252 | Write_Str ("New overloaded entity chain: "); | |
7253 | Write_Name (Chars (S)); | |
996ae0b0 | 7254 | |
82c80734 | 7255 | E := S; |
996ae0b0 RK |
7256 | while Present (E) loop |
7257 | Write_Str (" "); Write_Int (Int (E)); | |
7258 | E := Homonym (E); | |
7259 | end loop; | |
7260 | ||
7261 | Write_Eol; | |
7262 | end if; | |
7263 | ||
7264 | -- Generate warning for hiding | |
7265 | ||
7266 | if Warn_On_Hiding | |
7267 | and then Comes_From_Source (S) | |
7268 | and then In_Extended_Main_Source_Unit (S) | |
7269 | then | |
7270 | E := S; | |
7271 | loop | |
7272 | E := Homonym (E); | |
7273 | exit when No (E); | |
7274 | ||
7fc53871 AC |
7275 | -- Warn unless genuine overloading. Do not emit warning on |
7276 | -- hiding predefined operators in Standard (these are either an | |
7277 | -- (artifact of our implicit declarations, or simple noise) but | |
7278 | -- keep warning on a operator defined on a local subtype, because | |
7279 | -- of the real danger that different operators may be applied in | |
7280 | -- various parts of the program. | |
996ae0b0 | 7281 | |
1f250383 AC |
7282 | -- Note that if E and S have the same scope, there is never any |
7283 | -- hiding. Either the two conflict, and the program is illegal, | |
7284 | -- or S is overriding an implicit inherited subprogram. | |
7285 | ||
7286 | if Scope (E) /= Scope (S) | |
7287 | and then (not Is_Overloadable (E) | |
8d606a78 | 7288 | or else Subtype_Conformant (E, S)) |
f937473f RD |
7289 | and then (Is_Immediately_Visible (E) |
7290 | or else | |
7291 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 7292 | then |
7fc53871 AC |
7293 | if Scope (E) /= Standard_Standard then |
7294 | Error_Msg_Sloc := Sloc (E); | |
3ccedacc | 7295 | Error_Msg_N ("declaration of & hides one #?h?", S); |
7fc53871 AC |
7296 | |
7297 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
7298 | and then | |
1f250383 | 7299 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
7300 | then |
7301 | Error_Msg_N | |
dbfeb4fa | 7302 | ("declaration of & hides predefined operator?h?", S); |
7fc53871 | 7303 | end if; |
996ae0b0 RK |
7304 | end if; |
7305 | end loop; | |
7306 | end if; | |
7307 | end Enter_Overloaded_Entity; | |
7308 | ||
e5a58fac AC |
7309 | ----------------------------- |
7310 | -- Check_Untagged_Equality -- | |
7311 | ----------------------------- | |
7312 | ||
7313 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
7314 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
7315 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
7316 | Obj_Decl : Node_Id; | |
7317 | ||
7318 | begin | |
7c0c194b AC |
7319 | -- This check applies only if we have a subprogram declaration with an |
7320 | -- untagged record type. | |
b2834fbd AC |
7321 | |
7322 | if Nkind (Decl) /= N_Subprogram_Declaration | |
7323 | or else not Is_Record_Type (Typ) | |
7324 | or else Is_Tagged_Type (Typ) | |
e5a58fac | 7325 | then |
b2834fbd AC |
7326 | return; |
7327 | end if; | |
e5a58fac | 7328 | |
b2834fbd AC |
7329 | -- In Ada 2012 case, we will output errors or warnings depending on |
7330 | -- the setting of debug flag -gnatd.E. | |
7331 | ||
7332 | if Ada_Version >= Ada_2012 then | |
7333 | Error_Msg_Warn := Debug_Flag_Dot_EE; | |
7334 | ||
7335 | -- In earlier versions of Ada, nothing to do unless we are warning on | |
7336 | -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). | |
7337 | ||
7338 | else | |
7339 | if not Warn_On_Ada_2012_Compatibility then | |
7340 | return; | |
7341 | end if; | |
7342 | end if; | |
7343 | ||
7344 | -- Cases where the type has already been frozen | |
e5a58fac | 7345 | |
b2834fbd AC |
7346 | if Is_Frozen (Typ) then |
7347 | ||
7348 | -- If the type is not declared in a package, or if we are in the body | |
7349 | -- of the package or in some other scope, the new operation is not | |
7350 | -- primitive, and therefore legal, though suspicious. Should we | |
7351 | -- generate a warning in this case ??? | |
7352 | ||
7353 | if Ekind (Scope (Typ)) /= E_Package | |
7354 | or else Scope (Typ) /= Current_Scope | |
7355 | then | |
7356 | return; | |
7357 | ||
7358 | -- If the type is a generic actual (sub)type, the operation is not | |
7359 | -- primitive either because the base type is declared elsewhere. | |
7360 | ||
7361 | elsif Is_Generic_Actual_Type (Typ) then | |
7362 | return; | |
7363 | ||
7364 | -- Here we have a definite error of declaration after freezing | |
7365 | ||
7366 | else | |
7367 | if Ada_Version >= Ada_2012 then | |
ae6ede77 | 7368 | Error_Msg_NE |
3ccedacc | 7369 | ("equality operator must be declared before type & is " |
b2834fbd AC |
7370 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); |
7371 | ||
7372 | -- In Ada 2012 mode with error turned to warning, output one | |
7373 | -- more warning to warn that the equality operation may not | |
7374 | -- compose. This is the consequence of ignoring the error. | |
7375 | ||
7376 | if Error_Msg_Warn then | |
7377 | Error_Msg_N ("\equality operation may not compose??", Eq_Op); | |
7378 | end if; | |
21a5b575 AC |
7379 | |
7380 | else | |
7381 | Error_Msg_NE | |
b2834fbd AC |
7382 | ("equality operator must be declared before type& is " |
7383 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); | |
7384 | end if; | |
7385 | ||
7386 | -- If we are in the package body, we could just move the | |
7387 | -- declaration to the package spec, so add a message saying that. | |
7388 | ||
7389 | if In_Package_Body (Scope (Typ)) then | |
7390 | if Ada_Version >= Ada_2012 then | |
7391 | Error_Msg_N | |
7392 | ("\move declaration to package spec<<", Eq_Op); | |
7393 | else | |
7394 | Error_Msg_N | |
7395 | ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); | |
7396 | end if; | |
21a5b575 | 7397 | |
b2834fbd AC |
7398 | -- Otherwise try to find the freezing point |
7399 | ||
7400 | else | |
21a5b575 | 7401 | Obj_Decl := Next (Parent (Typ)); |
dbfeb4fa | 7402 | while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
21a5b575 AC |
7403 | if Nkind (Obj_Decl) = N_Object_Declaration |
7404 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
7405 | then | |
b2834fbd AC |
7406 | -- Freezing point, output warnings |
7407 | ||
7408 | if Ada_Version >= Ada_2012 then | |
7409 | Error_Msg_NE | |
7410 | ("type& is frozen by declaration??", Obj_Decl, Typ); | |
7411 | Error_Msg_N | |
7412 | ("\an equality operator cannot be declared after " | |
7413 | & "this point??", | |
7414 | Obj_Decl); | |
7415 | else | |
7416 | Error_Msg_NE | |
7417 | ("type& is frozen by declaration (Ada 2012)?y?", | |
7418 | Obj_Decl, Typ); | |
7419 | Error_Msg_N | |
7420 | ("\an equality operator cannot be declared after " | |
7421 | & "this point (Ada 2012)?y?", | |
7422 | Obj_Decl); | |
7423 | end if; | |
7424 | ||
21a5b575 AC |
7425 | exit; |
7426 | end if; | |
7427 | ||
7428 | Next (Obj_Decl); | |
7429 | end loop; | |
7430 | end if; | |
b2834fbd | 7431 | end if; |
e5a58fac | 7432 | |
b2834fbd AC |
7433 | -- Here if type is not frozen yet. It is illegal to have a primitive |
7434 | -- equality declared in the private part if the type is visible. | |
21a5b575 | 7435 | |
b2834fbd AC |
7436 | elsif not In_Same_List (Parent (Typ), Decl) |
7437 | and then not Is_Limited_Type (Typ) | |
7438 | then | |
7439 | -- Shouldn't we give an RM reference here??? | |
21a5b575 | 7440 | |
b2834fbd AC |
7441 | if Ada_Version >= Ada_2012 then |
7442 | Error_Msg_N | |
7443 | ("equality operator appears too late<<", Eq_Op); | |
7444 | else | |
7445 | Error_Msg_N | |
7446 | ("equality operator appears too late (Ada 2012)?y?", Eq_Op); | |
e5a58fac | 7447 | end if; |
b2834fbd AC |
7448 | |
7449 | -- No error detected | |
7450 | ||
7451 | else | |
7452 | return; | |
e5a58fac AC |
7453 | end if; |
7454 | end Check_Untagged_Equality; | |
7455 | ||
996ae0b0 RK |
7456 | ----------------------------- |
7457 | -- Find_Corresponding_Spec -- | |
7458 | ----------------------------- | |
7459 | ||
d44202ba HK |
7460 | function Find_Corresponding_Spec |
7461 | (N : Node_Id; | |
7462 | Post_Error : Boolean := True) return Entity_Id | |
7463 | is | |
996ae0b0 RK |
7464 | Spec : constant Node_Id := Specification (N); |
7465 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
7466 | ||
7467 | E : Entity_Id; | |
7468 | ||
70f4ad20 AC |
7469 | function Different_Generic_Profile (E : Entity_Id) return Boolean; |
7470 | -- Even if fully conformant, a body may depend on a generic actual when | |
7471 | -- the spec does not, or vice versa, in which case they were distinct | |
7472 | -- entities in the generic. | |
7473 | ||
7474 | ------------------------------- | |
7475 | -- Different_Generic_Profile -- | |
7476 | ------------------------------- | |
7477 | ||
7478 | function Different_Generic_Profile (E : Entity_Id) return Boolean is | |
7479 | F1, F2 : Entity_Id; | |
7480 | ||
2995860f AC |
7481 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
7482 | -- Check that the types of corresponding formals have the same | |
7483 | -- generic actual if any. We have to account for subtypes of a | |
7484 | -- generic formal, declared between a spec and a body, which may | |
73999267 AC |
7485 | -- appear distinct in an instance but matched in the generic, and |
7486 | -- the subtype may be used either in the spec or the body of the | |
7487 | -- subprogram being checked. | |
2995860f AC |
7488 | |
7489 | ------------------------- | |
7490 | -- Same_Generic_Actual -- | |
7491 | ------------------------- | |
7492 | ||
7493 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is | |
73999267 AC |
7494 | |
7495 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean; | |
7496 | -- Predicate to check whether S1 is a subtype of S2 in the source | |
7497 | -- of the instance. | |
7498 | ||
7499 | ------------------------- | |
7500 | -- Is_Declared_Subtype -- | |
7501 | ------------------------- | |
7502 | ||
7503 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean is | |
7504 | begin | |
7505 | return Comes_From_Source (Parent (S1)) | |
7506 | and then Nkind (Parent (S1)) = N_Subtype_Declaration | |
7507 | and then Is_Entity_Name (Subtype_Indication (Parent (S1))) | |
7508 | and then Entity (Subtype_Indication (Parent (S1))) = S2; | |
7509 | end Is_Declared_Subtype; | |
7510 | ||
7511 | -- Start of processing for Same_Generic_Actual | |
7512 | ||
2995860f AC |
7513 | begin |
7514 | return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) | |
73999267 AC |
7515 | or else Is_Declared_Subtype (T1, T2) |
7516 | or else Is_Declared_Subtype (T2, T1); | |
2995860f AC |
7517 | end Same_Generic_Actual; |
7518 | ||
7519 | -- Start of processing for Different_Generic_Profile | |
7520 | ||
70f4ad20 | 7521 | begin |
2995860f AC |
7522 | if not In_Instance then |
7523 | return False; | |
7524 | ||
7525 | elsif Ekind (E) = E_Function | |
7526 | and then not Same_Generic_Actual (Etype (E), Etype (Designator)) | |
70f4ad20 AC |
7527 | then |
7528 | return True; | |
7529 | end if; | |
7530 | ||
7531 | F1 := First_Formal (Designator); | |
7532 | F2 := First_Formal (E); | |
70f4ad20 | 7533 | while Present (F1) loop |
2995860f | 7534 | if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
70f4ad20 AC |
7535 | return True; |
7536 | end if; | |
7537 | ||
7538 | Next_Formal (F1); | |
7539 | Next_Formal (F2); | |
7540 | end loop; | |
7541 | ||
7542 | return False; | |
7543 | end Different_Generic_Profile; | |
7544 | ||
7545 | -- Start of processing for Find_Corresponding_Spec | |
7546 | ||
996ae0b0 RK |
7547 | begin |
7548 | E := Current_Entity (Designator); | |
996ae0b0 RK |
7549 | while Present (E) loop |
7550 | ||
7551 | -- We are looking for a matching spec. It must have the same scope, | |
7552 | -- and the same name, and either be type conformant, or be the case | |
7553 | -- of a library procedure spec and its body (which belong to one | |
7554 | -- another regardless of whether they are type conformant or not). | |
7555 | ||
7556 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
7557 | if Current_Scope = Standard_Standard |
7558 | or else (Ekind (E) = Ekind (Designator) | |
586ecbf3 | 7559 | and then Type_Conformant (E, Designator)) |
996ae0b0 RK |
7560 | then |
7561 | -- Within an instantiation, we know that spec and body are | |
70f4ad20 AC |
7562 | -- subtype conformant, because they were subtype conformant in |
7563 | -- the generic. We choose the subtype-conformant entity here as | |
7564 | -- well, to resolve spurious ambiguities in the instance that | |
7565 | -- were not present in the generic (i.e. when two different | |
7566 | -- types are given the same actual). If we are looking for a | |
7567 | -- spec to match a body, full conformance is expected. | |
996ae0b0 RK |
7568 | |
7569 | if In_Instance then | |
c05ba1f1 AC |
7570 | |
7571 | -- Inherit the convention and "ghostness" of the matching | |
7572 | -- spec to ensure proper full and subtype conformance. | |
7573 | ||
996ae0b0 RK |
7574 | Set_Convention (Designator, Convention (E)); |
7575 | ||
c05ba1f1 AC |
7576 | if Is_Ghost_Entity (E) then |
7577 | Set_Is_Ghost_Entity (Designator); | |
7578 | end if; | |
7579 | ||
0187b60e AC |
7580 | -- Skip past subprogram bodies and subprogram renamings that |
7581 | -- may appear to have a matching spec, but that aren't fully | |
7582 | -- conformant with it. That can occur in cases where an | |
7583 | -- actual type causes unrelated homographs in the instance. | |
7584 | ||
7585 | if Nkind_In (N, N_Subprogram_Body, | |
7586 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 7587 | and then Present (Homonym (E)) |
c7b9d548 | 7588 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
7589 | then |
7590 | goto Next_Entity; | |
7591 | ||
c7b9d548 | 7592 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 | 7593 | goto Next_Entity; |
70f4ad20 AC |
7594 | |
7595 | elsif Different_Generic_Profile (E) then | |
7596 | goto Next_Entity; | |
996ae0b0 RK |
7597 | end if; |
7598 | end if; | |
7599 | ||
25ebc085 AC |
7600 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
7601 | -- null procedures locate the internally generated spec. We | |
7602 | -- enforce mode conformance since a tagged type may inherit | |
7603 | -- from interfaces several null primitives which differ only | |
7604 | -- in the mode of the formals. | |
7605 | ||
7606 | if not (Comes_From_Source (E)) | |
7607 | and then Is_Null_Procedure (E) | |
7608 | and then not Mode_Conformant (Designator, E) | |
7609 | then | |
7610 | null; | |
7611 | ||
4d8f3296 ES |
7612 | -- For null procedures coming from source that are completions, |
7613 | -- analysis of the generated body will establish the link. | |
7614 | ||
7615 | elsif Comes_From_Source (E) | |
7616 | and then Nkind (Spec) = N_Procedure_Specification | |
7617 | and then Null_Present (Spec) | |
7618 | then | |
7619 | return E; | |
7620 | ||
25ebc085 | 7621 | elsif not Has_Completion (E) then |
996ae0b0 RK |
7622 | if Nkind (N) /= N_Subprogram_Body_Stub then |
7623 | Set_Corresponding_Spec (N, E); | |
7624 | end if; | |
7625 | ||
7626 | Set_Has_Completion (E); | |
7627 | return E; | |
7628 | ||
7629 | elsif Nkind (Parent (N)) = N_Subunit then | |
7630 | ||
7631 | -- If this is the proper body of a subunit, the completion | |
7632 | -- flag is set when analyzing the stub. | |
7633 | ||
7634 | return E; | |
7635 | ||
70f4ad20 AC |
7636 | -- If E is an internal function with a controlling result that |
7637 | -- was created for an operation inherited by a null extension, | |
7638 | -- it may be overridden by a body without a previous spec (one | |
2995860f | 7639 | -- more reason why these should be shunned). In that case we |
70f4ad20 AC |
7640 | -- remove the generated body if present, because the current |
7641 | -- one is the explicit overriding. | |
81db9d77 ES |
7642 | |
7643 | elsif Ekind (E) = E_Function | |
0791fbe9 | 7644 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
7645 | and then not Comes_From_Source (E) |
7646 | and then Has_Controlling_Result (E) | |
7647 | and then Is_Null_Extension (Etype (E)) | |
7648 | and then Comes_From_Source (Spec) | |
7649 | then | |
7650 | Set_Has_Completion (E, False); | |
7651 | ||
1366997b AC |
7652 | if Expander_Active |
7653 | and then Nkind (Parent (E)) = N_Function_Specification | |
7654 | then | |
81db9d77 ES |
7655 | Remove |
7656 | (Unit_Declaration_Node | |
1366997b AC |
7657 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
7658 | ||
81db9d77 ES |
7659 | return E; |
7660 | ||
1366997b AC |
7661 | -- If expansion is disabled, or if the wrapper function has |
7662 | -- not been generated yet, this a late body overriding an | |
7663 | -- inherited operation, or it is an overriding by some other | |
7664 | -- declaration before the controlling result is frozen. In | |
7665 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
7666 | |
7667 | else | |
7668 | return Empty; | |
7669 | end if; | |
7670 | ||
d44202ba HK |
7671 | -- If the body already exists, then this is an error unless |
7672 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
7673 | -- derived subprogram. It is also legal for an instance to |
7674 | -- contain type conformant overloadable declarations (but the | |
7675 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
7676 | |
7677 | elsif No (Alias (E)) | |
7678 | and then not Is_Intrinsic_Subprogram (E) | |
7679 | and then not In_Instance | |
d44202ba | 7680 | and then Post_Error |
996ae0b0 RK |
7681 | then |
7682 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 7683 | |
07fc65c4 GB |
7684 | if Is_Imported (E) then |
7685 | Error_Msg_NE | |
7686 | ("body not allowed for imported subprogram & declared#", | |
7687 | N, E); | |
7688 | else | |
7689 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
7690 | end if; | |
996ae0b0 RK |
7691 | end if; |
7692 | ||
d44202ba HK |
7693 | -- Child units cannot be overloaded, so a conformance mismatch |
7694 | -- between body and a previous spec is an error. | |
7695 | ||
996ae0b0 RK |
7696 | elsif Is_Child_Unit (E) |
7697 | and then | |
7698 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
7699 | and then | |
5d37ba92 | 7700 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
7701 | N_Compilation_Unit |
7702 | and then Post_Error | |
996ae0b0 | 7703 | then |
996ae0b0 RK |
7704 | Error_Msg_N |
7705 | ("body of child unit does not match previous declaration", N); | |
7706 | end if; | |
7707 | end if; | |
7708 | ||
7709 | <<Next_Entity>> | |
7710 | E := Homonym (E); | |
7711 | end loop; | |
7712 | ||
7713 | -- On exit, we know that no previous declaration of subprogram exists | |
7714 | ||
7715 | return Empty; | |
7716 | end Find_Corresponding_Spec; | |
7717 | ||
7718 | ---------------------- | |
7719 | -- Fully_Conformant -- | |
7720 | ---------------------- | |
7721 | ||
7722 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
7723 | Result : Boolean; | |
996ae0b0 RK |
7724 | begin |
7725 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
7726 | return Result; | |
7727 | end Fully_Conformant; | |
7728 | ||
7729 | ---------------------------------- | |
7730 | -- Fully_Conformant_Expressions -- | |
7731 | ---------------------------------- | |
7732 | ||
7733 | function Fully_Conformant_Expressions | |
7734 | (Given_E1 : Node_Id; | |
d05ef0ab | 7735 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
7736 | is |
7737 | E1 : constant Node_Id := Original_Node (Given_E1); | |
7738 | E2 : constant Node_Id := Original_Node (Given_E2); | |
7739 | -- We always test conformance on original nodes, since it is possible | |
7740 | -- for analysis and/or expansion to make things look as though they | |
7741 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
7742 | ||
7743 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
7744 | renames Fully_Conformant_Expressions; | |
7745 | ||
7746 | function FCL (L1, L2 : List_Id) return Boolean; | |
70f4ad20 AC |
7747 | -- Compare elements of two lists for conformance. Elements have to be |
7748 | -- conformant, and actuals inserted as default parameters do not match | |
7749 | -- explicit actuals with the same value. | |
996ae0b0 RK |
7750 | |
7751 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 7752 | -- Compare an operator node with a function call |
996ae0b0 RK |
7753 | |
7754 | --------- | |
7755 | -- FCL -- | |
7756 | --------- | |
7757 | ||
7758 | function FCL (L1, L2 : List_Id) return Boolean is | |
7759 | N1, N2 : Node_Id; | |
7760 | ||
7761 | begin | |
7762 | if L1 = No_List then | |
7763 | N1 := Empty; | |
7764 | else | |
7765 | N1 := First (L1); | |
7766 | end if; | |
7767 | ||
7768 | if L2 = No_List then | |
7769 | N2 := Empty; | |
7770 | else | |
7771 | N2 := First (L2); | |
7772 | end if; | |
7773 | ||
70f4ad20 | 7774 | -- Compare two lists, skipping rewrite insertions (we want to compare |
a90bd866 | 7775 | -- the original trees, not the expanded versions). |
996ae0b0 RK |
7776 | |
7777 | loop | |
7778 | if Is_Rewrite_Insertion (N1) then | |
7779 | Next (N1); | |
7780 | elsif Is_Rewrite_Insertion (N2) then | |
7781 | Next (N2); | |
7782 | elsif No (N1) then | |
7783 | return No (N2); | |
7784 | elsif No (N2) then | |
7785 | return False; | |
7786 | elsif not FCE (N1, N2) then | |
7787 | return False; | |
7788 | else | |
7789 | Next (N1); | |
7790 | Next (N2); | |
7791 | end if; | |
7792 | end loop; | |
7793 | end FCL; | |
7794 | ||
7795 | --------- | |
7796 | -- FCO -- | |
7797 | --------- | |
7798 | ||
7799 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
7800 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
7801 | Act : Node_Id; | |
7802 | ||
7803 | begin | |
7804 | if No (Actuals) | |
7805 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
7806 | then | |
7807 | return False; | |
7808 | ||
7809 | else | |
7810 | Act := First (Actuals); | |
7811 | ||
7812 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
7813 | if not FCE (Left_Opnd (Op_Node), Act) then |
7814 | return False; | |
7815 | end if; | |
7816 | ||
7817 | Next (Act); | |
7818 | end if; | |
7819 | ||
7820 | return Present (Act) | |
7821 | and then FCE (Right_Opnd (Op_Node), Act) | |
7822 | and then No (Next (Act)); | |
7823 | end if; | |
7824 | end FCO; | |
7825 | ||
7826 | -- Start of processing for Fully_Conformant_Expressions | |
7827 | ||
7828 | begin | |
7829 | -- Non-conformant if paren count does not match. Note: if some idiot | |
7830 | -- complains that we don't do this right for more than 3 levels of | |
a90bd866 | 7831 | -- parentheses, they will be treated with the respect they deserve. |
996ae0b0 RK |
7832 | |
7833 | if Paren_Count (E1) /= Paren_Count (E2) then | |
7834 | return False; | |
7835 | ||
82c80734 RD |
7836 | -- If same entities are referenced, then they are conformant even if |
7837 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
7838 | |
7839 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
7840 | if Present (Entity (E1)) then | |
7841 | return Entity (E1) = Entity (E2) | |
7842 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
7843 | and then Ekind (Entity (E1)) = E_Discriminant | |
7844 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
7845 | ||
7846 | elsif Nkind (E1) = N_Expanded_Name | |
7847 | and then Nkind (E2) = N_Expanded_Name | |
7848 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
7849 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
7850 | then | |
7851 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
7852 | ||
7853 | else | |
7854 | -- Identifiers in component associations don't always have | |
7855 | -- entities, but their names must conform. | |
7856 | ||
7857 | return Nkind (E1) = N_Identifier | |
7858 | and then Nkind (E2) = N_Identifier | |
7859 | and then Chars (E1) = Chars (E2); | |
7860 | end if; | |
7861 | ||
7862 | elsif Nkind (E1) = N_Character_Literal | |
7863 | and then Nkind (E2) = N_Expanded_Name | |
7864 | then | |
7865 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
7866 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
7867 | ||
7868 | elsif Nkind (E2) = N_Character_Literal | |
7869 | and then Nkind (E1) = N_Expanded_Name | |
7870 | then | |
7871 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
7872 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
7873 | ||
8fde064e | 7874 | elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
996ae0b0 RK |
7875 | return FCO (E1, E2); |
7876 | ||
8fde064e | 7877 | elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
996ae0b0 RK |
7878 | return FCO (E2, E1); |
7879 | ||
7880 | -- Otherwise we must have the same syntactic entity | |
7881 | ||
7882 | elsif Nkind (E1) /= Nkind (E2) then | |
7883 | return False; | |
7884 | ||
7885 | -- At this point, we specialize by node type | |
7886 | ||
7887 | else | |
7888 | case Nkind (E1) is | |
7889 | ||
7890 | when N_Aggregate => | |
7891 | return | |
7892 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
7893 | and then |
7894 | FCL (Component_Associations (E1), | |
7895 | Component_Associations (E2)); | |
996ae0b0 RK |
7896 | |
7897 | when N_Allocator => | |
7898 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
7899 | or else | |
7900 | Nkind (Expression (E2)) = N_Qualified_Expression | |
7901 | then | |
7902 | return FCE (Expression (E1), Expression (E2)); | |
7903 | ||
7904 | -- Check that the subtype marks and any constraints | |
7905 | -- are conformant | |
7906 | ||
7907 | else | |
7908 | declare | |
7909 | Indic1 : constant Node_Id := Expression (E1); | |
7910 | Indic2 : constant Node_Id := Expression (E2); | |
7911 | Elt1 : Node_Id; | |
7912 | Elt2 : Node_Id; | |
7913 | ||
7914 | begin | |
7915 | if Nkind (Indic1) /= N_Subtype_Indication then | |
7916 | return | |
7917 | Nkind (Indic2) /= N_Subtype_Indication | |
7918 | and then Entity (Indic1) = Entity (Indic2); | |
7919 | ||
7920 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
7921 | return | |
7922 | Nkind (Indic1) /= N_Subtype_Indication | |
7923 | and then Entity (Indic1) = Entity (Indic2); | |
7924 | ||
7925 | else | |
7926 | if Entity (Subtype_Mark (Indic1)) /= | |
7927 | Entity (Subtype_Mark (Indic2)) | |
7928 | then | |
7929 | return False; | |
7930 | end if; | |
7931 | ||
7932 | Elt1 := First (Constraints (Constraint (Indic1))); | |
7933 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
7934 | while Present (Elt1) and then Present (Elt2) loop |
7935 | if not FCE (Elt1, Elt2) then | |
7936 | return False; | |
7937 | end if; | |
7938 | ||
7939 | Next (Elt1); | |
7940 | Next (Elt2); | |
7941 | end loop; | |
7942 | ||
7943 | return True; | |
7944 | end if; | |
7945 | end; | |
7946 | end if; | |
7947 | ||
7948 | when N_Attribute_Reference => | |
7949 | return | |
7950 | Attribute_Name (E1) = Attribute_Name (E2) | |
7951 | and then FCL (Expressions (E1), Expressions (E2)); | |
7952 | ||
7953 | when N_Binary_Op => | |
7954 | return | |
7955 | Entity (E1) = Entity (E2) | |
7956 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7957 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7958 | ||
514d0fc5 | 7959 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
7960 | return |
7961 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7962 | and then | |
7963 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7964 | ||
19d846a0 RD |
7965 | when N_Case_Expression => |
7966 | declare | |
7967 | Alt1 : Node_Id; | |
7968 | Alt2 : Node_Id; | |
7969 | ||
7970 | begin | |
7971 | if not FCE (Expression (E1), Expression (E2)) then | |
7972 | return False; | |
7973 | ||
7974 | else | |
7975 | Alt1 := First (Alternatives (E1)); | |
7976 | Alt2 := First (Alternatives (E2)); | |
7977 | loop | |
7978 | if Present (Alt1) /= Present (Alt2) then | |
7979 | return False; | |
7980 | elsif No (Alt1) then | |
7981 | return True; | |
7982 | end if; | |
7983 | ||
7984 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
7985 | or else not FCL (Discrete_Choices (Alt1), | |
7986 | Discrete_Choices (Alt2)) | |
7987 | then | |
7988 | return False; | |
7989 | end if; | |
7990 | ||
7991 | Next (Alt1); | |
7992 | Next (Alt2); | |
7993 | end loop; | |
7994 | end if; | |
7995 | end; | |
7996 | ||
996ae0b0 RK |
7997 | when N_Character_Literal => |
7998 | return | |
7999 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
8000 | ||
8001 | when N_Component_Association => | |
8002 | return | |
8003 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
8004 | and then |
8005 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 8006 | |
996ae0b0 RK |
8007 | when N_Explicit_Dereference => |
8008 | return | |
8009 | FCE (Prefix (E1), Prefix (E2)); | |
8010 | ||
8011 | when N_Extension_Aggregate => | |
8012 | return | |
8013 | FCL (Expressions (E1), Expressions (E2)) | |
8014 | and then Null_Record_Present (E1) = | |
8015 | Null_Record_Present (E2) | |
8016 | and then FCL (Component_Associations (E1), | |
8017 | Component_Associations (E2)); | |
8018 | ||
8019 | when N_Function_Call => | |
8020 | return | |
8021 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
8022 | and then |
8023 | FCL (Parameter_Associations (E1), | |
8024 | Parameter_Associations (E2)); | |
996ae0b0 | 8025 | |
9b16cb57 RD |
8026 | when N_If_Expression => |
8027 | return | |
8028 | FCL (Expressions (E1), Expressions (E2)); | |
8029 | ||
996ae0b0 RK |
8030 | when N_Indexed_Component => |
8031 | return | |
8032 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
8033 | and then |
8034 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
8035 | |
8036 | when N_Integer_Literal => | |
8037 | return (Intval (E1) = Intval (E2)); | |
8038 | ||
8039 | when N_Null => | |
8040 | return True; | |
8041 | ||
8042 | when N_Operator_Symbol => | |
8043 | return | |
8044 | Chars (E1) = Chars (E2); | |
8045 | ||
8046 | when N_Others_Choice => | |
8047 | return True; | |
8048 | ||
8049 | when N_Parameter_Association => | |
8050 | return | |
996ae0b0 RK |
8051 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
8052 | and then FCE (Explicit_Actual_Parameter (E1), | |
8053 | Explicit_Actual_Parameter (E2)); | |
8054 | ||
8055 | when N_Qualified_Expression => | |
8056 | return | |
8057 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
8058 | and then |
8059 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 8060 | |
2010d078 AC |
8061 | when N_Quantified_Expression => |
8062 | if not FCE (Condition (E1), Condition (E2)) then | |
8063 | return False; | |
8064 | end if; | |
8065 | ||
8066 | if Present (Loop_Parameter_Specification (E1)) | |
8067 | and then Present (Loop_Parameter_Specification (E2)) | |
8068 | then | |
8069 | declare | |
8070 | L1 : constant Node_Id := | |
8071 | Loop_Parameter_Specification (E1); | |
8072 | L2 : constant Node_Id := | |
8073 | Loop_Parameter_Specification (E2); | |
8074 | ||
8075 | begin | |
8076 | return | |
8077 | Reverse_Present (L1) = Reverse_Present (L2) | |
8078 | and then | |
8079 | FCE (Defining_Identifier (L1), | |
8080 | Defining_Identifier (L2)) | |
8081 | and then | |
8082 | FCE (Discrete_Subtype_Definition (L1), | |
8083 | Discrete_Subtype_Definition (L2)); | |
8084 | end; | |
8085 | ||
804670f1 AC |
8086 | elsif Present (Iterator_Specification (E1)) |
8087 | and then Present (Iterator_Specification (E2)) | |
8088 | then | |
2010d078 AC |
8089 | declare |
8090 | I1 : constant Node_Id := Iterator_Specification (E1); | |
8091 | I2 : constant Node_Id := Iterator_Specification (E2); | |
8092 | ||
8093 | begin | |
8094 | return | |
8095 | FCE (Defining_Identifier (I1), | |
8096 | Defining_Identifier (I2)) | |
8097 | and then | |
8098 | Of_Present (I1) = Of_Present (I2) | |
8099 | and then | |
8100 | Reverse_Present (I1) = Reverse_Present (I2) | |
8101 | and then FCE (Name (I1), Name (I2)) | |
8102 | and then FCE (Subtype_Indication (I1), | |
8103 | Subtype_Indication (I2)); | |
8104 | end; | |
804670f1 AC |
8105 | |
8106 | -- The quantified expressions used different specifications to | |
8107 | -- walk their respective ranges. | |
8108 | ||
8109 | else | |
8110 | return False; | |
2010d078 AC |
8111 | end if; |
8112 | ||
996ae0b0 RK |
8113 | when N_Range => |
8114 | return | |
8115 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
8116 | and then |
8117 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
8118 | |
8119 | when N_Real_Literal => | |
8120 | return (Realval (E1) = Realval (E2)); | |
8121 | ||
8122 | when N_Selected_Component => | |
8123 | return | |
8124 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
8125 | and then |
8126 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
8127 | |
8128 | when N_Slice => | |
8129 | return | |
8130 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
8131 | and then |
8132 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
8133 | |
8134 | when N_String_Literal => | |
8135 | declare | |
8136 | S1 : constant String_Id := Strval (E1); | |
8137 | S2 : constant String_Id := Strval (E2); | |
8138 | L1 : constant Nat := String_Length (S1); | |
8139 | L2 : constant Nat := String_Length (S2); | |
8140 | ||
8141 | begin | |
8142 | if L1 /= L2 then | |
8143 | return False; | |
8144 | ||
8145 | else | |
8146 | for J in 1 .. L1 loop | |
8147 | if Get_String_Char (S1, J) /= | |
8148 | Get_String_Char (S2, J) | |
8149 | then | |
8150 | return False; | |
8151 | end if; | |
8152 | end loop; | |
8153 | ||
8154 | return True; | |
8155 | end if; | |
8156 | end; | |
8157 | ||
8158 | when N_Type_Conversion => | |
8159 | return | |
8160 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
8161 | and then |
8162 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
8163 | |
8164 | when N_Unary_Op => | |
8165 | return | |
8166 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
8167 | and then |
8168 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
8169 | |
8170 | when N_Unchecked_Type_Conversion => | |
8171 | return | |
8172 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
8173 | and then |
8174 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
8175 | |
8176 | -- All other node types cannot appear in this context. Strictly | |
8177 | -- we should raise a fatal internal error. Instead we just ignore | |
8178 | -- the nodes. This means that if anyone makes a mistake in the | |
2995860f AC |
8179 | -- expander and mucks an expression tree irretrievably, the result |
8180 | -- will be a failure to detect a (probably very obscure) case | |
8181 | -- of non-conformance, which is better than bombing on some | |
996ae0b0 RK |
8182 | -- case where two expressions do in fact conform. |
8183 | ||
8184 | when others => | |
8185 | return True; | |
8186 | ||
8187 | end case; | |
8188 | end if; | |
8189 | end Fully_Conformant_Expressions; | |
8190 | ||
fbf5a39b AC |
8191 | ---------------------------------------- |
8192 | -- Fully_Conformant_Discrete_Subtypes -- | |
8193 | ---------------------------------------- | |
8194 | ||
8195 | function Fully_Conformant_Discrete_Subtypes | |
8196 | (Given_S1 : Node_Id; | |
d05ef0ab | 8197 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
8198 | is |
8199 | S1 : constant Node_Id := Original_Node (Given_S1); | |
8200 | S2 : constant Node_Id := Original_Node (Given_S2); | |
8201 | ||
8202 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
8203 | -- Special-case for a bound given by a discriminant, which in the body |
8204 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
8205 | |
8206 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 8207 | -- Check both bounds |
fbf5a39b | 8208 | |
5d37ba92 ES |
8209 | ----------------------- |
8210 | -- Conforming_Bounds -- | |
8211 | ----------------------- | |
8212 | ||
fbf5a39b AC |
8213 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
8214 | begin | |
8215 | if Is_Entity_Name (B1) | |
8216 | and then Is_Entity_Name (B2) | |
8217 | and then Ekind (Entity (B1)) = E_Discriminant | |
8218 | then | |
8219 | return Chars (B1) = Chars (B2); | |
8220 | ||
8221 | else | |
8222 | return Fully_Conformant_Expressions (B1, B2); | |
8223 | end if; | |
8224 | end Conforming_Bounds; | |
8225 | ||
5d37ba92 ES |
8226 | ----------------------- |
8227 | -- Conforming_Ranges -- | |
8228 | ----------------------- | |
8229 | ||
fbf5a39b AC |
8230 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
8231 | begin | |
8232 | return | |
8233 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
8234 | and then | |
8235 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
8236 | end Conforming_Ranges; | |
8237 | ||
8238 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
8239 | ||
8240 | begin | |
8241 | if Nkind (S1) /= Nkind (S2) then | |
8242 | return False; | |
8243 | ||
8244 | elsif Is_Entity_Name (S1) then | |
8245 | return Entity (S1) = Entity (S2); | |
8246 | ||
8247 | elsif Nkind (S1) = N_Range then | |
8248 | return Conforming_Ranges (S1, S2); | |
8249 | ||
8250 | elsif Nkind (S1) = N_Subtype_Indication then | |
8251 | return | |
8252 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
8253 | and then | |
8254 | Conforming_Ranges | |
8255 | (Range_Expression (Constraint (S1)), | |
8256 | Range_Expression (Constraint (S2))); | |
8257 | else | |
8258 | return True; | |
8259 | end if; | |
8260 | end Fully_Conformant_Discrete_Subtypes; | |
8261 | ||
996ae0b0 RK |
8262 | -------------------- |
8263 | -- Install_Entity -- | |
8264 | -------------------- | |
8265 | ||
8266 | procedure Install_Entity (E : Entity_Id) is | |
8267 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
8268 | begin |
8269 | Set_Is_Immediately_Visible (E); | |
8270 | Set_Current_Entity (E); | |
8271 | Set_Homonym (E, Prev); | |
8272 | end Install_Entity; | |
8273 | ||
8274 | --------------------- | |
8275 | -- Install_Formals -- | |
8276 | --------------------- | |
8277 | ||
8278 | procedure Install_Formals (Id : Entity_Id) is | |
8279 | F : Entity_Id; | |
996ae0b0 RK |
8280 | begin |
8281 | F := First_Formal (Id); | |
996ae0b0 RK |
8282 | while Present (F) loop |
8283 | Install_Entity (F); | |
8284 | Next_Formal (F); | |
8285 | end loop; | |
8286 | end Install_Formals; | |
8287 | ||
ce2b6ba5 JM |
8288 | ----------------------------- |
8289 | -- Is_Interface_Conformant -- | |
8290 | ----------------------------- | |
8291 | ||
8292 | function Is_Interface_Conformant | |
8293 | (Tagged_Type : Entity_Id; | |
8294 | Iface_Prim : Entity_Id; | |
8295 | Prim : Entity_Id) return Boolean | |
8296 | is | |
9e92ad49 AC |
8297 | -- The operation may in fact be an inherited (implicit) operation |
8298 | -- rather than the original interface primitive, so retrieve the | |
8299 | -- ultimate ancestor. | |
8300 | ||
8301 | Iface : constant Entity_Id := | |
8302 | Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); | |
fceeaab6 ES |
8303 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
8304 | ||
25ebc085 AC |
8305 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
8306 | -- Return the controlling formal of Prim | |
8307 | ||
59e6b23c AC |
8308 | ------------------------ |
8309 | -- Controlling_Formal -- | |
8310 | ------------------------ | |
8311 | ||
25ebc085 | 8312 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
15918371 | 8313 | E : Entity_Id; |
59e6b23c | 8314 | |
25ebc085 | 8315 | begin |
15918371 | 8316 | E := First_Entity (Prim); |
25ebc085 AC |
8317 | while Present (E) loop |
8318 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
8319 | return E; | |
8320 | end if; | |
8321 | ||
8322 | Next_Entity (E); | |
8323 | end loop; | |
8324 | ||
8325 | return Empty; | |
8326 | end Controlling_Formal; | |
8327 | ||
8328 | -- Local variables | |
8329 | ||
8330 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
8331 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
8332 | ||
8333 | -- Start of processing for Is_Interface_Conformant | |
8334 | ||
ce2b6ba5 JM |
8335 | begin |
8336 | pragma Assert (Is_Subprogram (Iface_Prim) | |
8337 | and then Is_Subprogram (Prim) | |
8338 | and then Is_Dispatching_Operation (Iface_Prim) | |
8339 | and then Is_Dispatching_Operation (Prim)); | |
8340 | ||
fceeaab6 | 8341 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
8342 | or else (Present (Alias (Iface_Prim)) |
8343 | and then | |
8344 | Is_Interface | |
8345 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
8346 | ||
8347 | if Prim = Iface_Prim | |
8348 | or else not Is_Subprogram (Prim) | |
8349 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
8350 | or else not Is_Dispatching_Operation (Prim) | |
8351 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 | 8352 | or else No (Typ) |
8a49a499 | 8353 | or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
ce2b6ba5 JM |
8354 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
8355 | then | |
8356 | return False; | |
8357 | ||
25ebc085 AC |
8358 | -- The mode of the controlling formals must match |
8359 | ||
8360 | elsif Present (Iface_Ctrl_F) | |
15918371 AC |
8361 | and then Present (Prim_Ctrl_F) |
8362 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
25ebc085 AC |
8363 | then |
8364 | return False; | |
8365 | ||
8366 | -- Case of a procedure, or a function whose result type matches the | |
8367 | -- result type of the interface primitive, or a function that has no | |
8368 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
8369 | |
8370 | elsif Ekind (Iface_Prim) = E_Procedure | |
8371 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 8372 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 8373 | then |
b4d7b435 AC |
8374 | return Type_Conformant |
8375 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 8376 | |
2995860f AC |
8377 | -- Case of a function returning an interface, or an access to one. Check |
8378 | -- that the return types correspond. | |
ce2b6ba5 | 8379 | |
fceeaab6 ES |
8380 | elsif Implements_Interface (Typ, Iface) then |
8381 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
8382 | /= |
8383 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
8384 | then |
8385 | return False; | |
fceeaab6 ES |
8386 | else |
8387 | return | |
9e92ad49 | 8388 | Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
ce2b6ba5 | 8389 | Skip_Controlling_Formals => True); |
fceeaab6 | 8390 | end if; |
ce2b6ba5 | 8391 | |
fceeaab6 ES |
8392 | else |
8393 | return False; | |
ce2b6ba5 | 8394 | end if; |
ce2b6ba5 JM |
8395 | end Is_Interface_Conformant; |
8396 | ||
996ae0b0 RK |
8397 | --------------------------------- |
8398 | -- Is_Non_Overriding_Operation -- | |
8399 | --------------------------------- | |
8400 | ||
8401 | function Is_Non_Overriding_Operation | |
8402 | (Prev_E : Entity_Id; | |
d05ef0ab | 8403 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
8404 | is |
8405 | Formal : Entity_Id; | |
8406 | F_Typ : Entity_Id; | |
8407 | G_Typ : Entity_Id := Empty; | |
8408 | ||
8409 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
8410 | -- If F_Type is a derived type associated with a generic actual subtype, |
8411 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
8412 | |
8413 | function Types_Correspond | |
8414 | (P_Type : Entity_Id; | |
d05ef0ab | 8415 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
8416 | -- Returns true if and only if the types (or designated types in the |
8417 | -- case of anonymous access types) are the same or N_Type is derived | |
8418 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
8419 | |
8420 | ----------------------------- | |
8421 | -- Get_Generic_Parent_Type -- | |
8422 | ----------------------------- | |
8423 | ||
8424 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
8425 | G_Typ : Entity_Id; | |
702d2020 | 8426 | Defn : Node_Id; |
996ae0b0 RK |
8427 | Indic : Node_Id; |
8428 | ||
8429 | begin | |
8430 | if Is_Derived_Type (F_Typ) | |
8431 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
8432 | then | |
82c80734 RD |
8433 | -- The tree must be traversed to determine the parent subtype in |
8434 | -- the generic unit, which unfortunately isn't always available | |
8435 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
8436 | -- is needed for cases where a full derived type has been | |
8437 | -- rewritten.) | |
996ae0b0 | 8438 | |
702d2020 AC |
8439 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); |
8440 | if Nkind (Defn) = N_Derived_Type_Definition then | |
8441 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 8442 | |
702d2020 AC |
8443 | if Nkind (Indic) = N_Subtype_Indication then |
8444 | G_Typ := Entity (Subtype_Mark (Indic)); | |
8445 | else | |
8446 | G_Typ := Entity (Indic); | |
8447 | end if; | |
996ae0b0 | 8448 | |
702d2020 AC |
8449 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
8450 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
8451 | then | |
8452 | return Generic_Parent_Type (Parent (G_Typ)); | |
8453 | end if; | |
996ae0b0 RK |
8454 | end if; |
8455 | end if; | |
8456 | ||
8457 | return Empty; | |
8458 | end Get_Generic_Parent_Type; | |
8459 | ||
8460 | ---------------------- | |
8461 | -- Types_Correspond -- | |
8462 | ---------------------- | |
8463 | ||
8464 | function Types_Correspond | |
8465 | (P_Type : Entity_Id; | |
d05ef0ab | 8466 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
8467 | is |
8468 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
8469 | New_Type : Entity_Id := Base_Type (N_Type); | |
8470 | ||
8471 | begin | |
8472 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
8473 | Prev_Type := Designated_Type (Prev_Type); | |
8474 | end if; | |
8475 | ||
8476 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
8477 | New_Type := Designated_Type (New_Type); | |
8478 | end if; | |
8479 | ||
8480 | if Prev_Type = New_Type then | |
8481 | return True; | |
8482 | ||
8483 | elsif not Is_Class_Wide_Type (New_Type) then | |
8484 | while Etype (New_Type) /= New_Type loop | |
8485 | New_Type := Etype (New_Type); | |
8486 | if New_Type = Prev_Type then | |
8487 | return True; | |
8488 | end if; | |
8489 | end loop; | |
8490 | end if; | |
8491 | return False; | |
8492 | end Types_Correspond; | |
8493 | ||
8494 | -- Start of processing for Is_Non_Overriding_Operation | |
8495 | ||
8496 | begin | |
82c80734 RD |
8497 | -- In the case where both operations are implicit derived subprograms |
8498 | -- then neither overrides the other. This can only occur in certain | |
8499 | -- obscure cases (e.g., derivation from homographs created in a generic | |
8500 | -- instantiation). | |
996ae0b0 RK |
8501 | |
8502 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
8503 | return True; | |
8504 | ||
8505 | elsif Ekind (Current_Scope) = E_Package | |
8506 | and then Is_Generic_Instance (Current_Scope) | |
8507 | and then In_Private_Part (Current_Scope) | |
8508 | and then Comes_From_Source (New_E) | |
8509 | then | |
702d2020 AC |
8510 | -- We examine the formals and result type of the inherited operation, |
8511 | -- to determine whether their type is derived from (the instance of) | |
8512 | -- a generic type. The first such formal or result type is the one | |
8513 | -- tested. | |
996ae0b0 RK |
8514 | |
8515 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
8516 | while Present (Formal) loop |
8517 | F_Typ := Base_Type (Etype (Formal)); | |
8518 | ||
8519 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
8520 | F_Typ := Designated_Type (F_Typ); | |
8521 | end if; | |
8522 | ||
8523 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 8524 | exit when Present (G_Typ); |
996ae0b0 RK |
8525 | |
8526 | Next_Formal (Formal); | |
8527 | end loop; | |
8528 | ||
c8ef728f | 8529 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
8530 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
8531 | end if; | |
8532 | ||
8533 | if No (G_Typ) then | |
8534 | return False; | |
8535 | end if; | |
8536 | ||
8dbd1460 AC |
8537 | -- If the generic type is a private type, then the original operation |
8538 | -- was not overriding in the generic, because there was no primitive | |
8539 | -- operation to override. | |
996ae0b0 RK |
8540 | |
8541 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
8542 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 8543 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
8544 | then |
8545 | return True; | |
8546 | ||
8547 | -- The generic parent type is the ancestor of a formal derived | |
8548 | -- type declaration. We need to check whether it has a primitive | |
8549 | -- operation that should be overridden by New_E in the generic. | |
8550 | ||
8551 | else | |
8552 | declare | |
8553 | P_Formal : Entity_Id; | |
8554 | N_Formal : Entity_Id; | |
8555 | P_Typ : Entity_Id; | |
8556 | N_Typ : Entity_Id; | |
8557 | P_Prim : Entity_Id; | |
8558 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
8559 | ||
8560 | begin | |
8561 | while Present (Prim_Elt) loop | |
8562 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 8563 | |
996ae0b0 RK |
8564 | if Chars (P_Prim) = Chars (New_E) |
8565 | and then Ekind (P_Prim) = Ekind (New_E) | |
8566 | then | |
8567 | P_Formal := First_Formal (P_Prim); | |
8568 | N_Formal := First_Formal (New_E); | |
8569 | while Present (P_Formal) and then Present (N_Formal) loop | |
8570 | P_Typ := Etype (P_Formal); | |
8571 | N_Typ := Etype (N_Formal); | |
8572 | ||
8573 | if not Types_Correspond (P_Typ, N_Typ) then | |
8574 | exit; | |
8575 | end if; | |
8576 | ||
8577 | Next_Entity (P_Formal); | |
8578 | Next_Entity (N_Formal); | |
8579 | end loop; | |
8580 | ||
82c80734 RD |
8581 | -- Found a matching primitive operation belonging to the |
8582 | -- formal ancestor type, so the new subprogram is | |
8583 | -- overriding. | |
996ae0b0 | 8584 | |
c8ef728f ES |
8585 | if No (P_Formal) |
8586 | and then No (N_Formal) | |
996ae0b0 RK |
8587 | and then (Ekind (New_E) /= E_Function |
8588 | or else | |
8fde064e AC |
8589 | Types_Correspond |
8590 | (Etype (P_Prim), Etype (New_E))) | |
996ae0b0 RK |
8591 | then |
8592 | return False; | |
8593 | end if; | |
8594 | end if; | |
8595 | ||
8596 | Next_Elmt (Prim_Elt); | |
8597 | end loop; | |
8598 | ||
2995860f AC |
8599 | -- If no match found, then the new subprogram does not override |
8600 | -- in the generic (nor in the instance). | |
996ae0b0 | 8601 | |
260359e3 AC |
8602 | -- If the type in question is not abstract, and the subprogram |
8603 | -- is, this will be an error if the new operation is in the | |
8604 | -- private part of the instance. Emit a warning now, which will | |
8605 | -- make the subsequent error message easier to understand. | |
8606 | ||
8607 | if not Is_Abstract_Type (F_Typ) | |
8608 | and then Is_Abstract_Subprogram (Prev_E) | |
8609 | and then In_Private_Part (Current_Scope) | |
8610 | then | |
8611 | Error_Msg_Node_2 := F_Typ; | |
8612 | Error_Msg_NE | |
3ccedacc AC |
8613 | ("private operation& in generic unit does not override " |
8614 | & "any primitive operation of& (RM 12.3 (18))??", | |
260359e3 AC |
8615 | New_E, New_E); |
8616 | end if; | |
8617 | ||
996ae0b0 RK |
8618 | return True; |
8619 | end; | |
8620 | end if; | |
8621 | else | |
8622 | return False; | |
8623 | end if; | |
8624 | end Is_Non_Overriding_Operation; | |
8625 | ||
beacce02 AC |
8626 | ------------------------------------- |
8627 | -- List_Inherited_Pre_Post_Aspects -- | |
8628 | ------------------------------------- | |
8629 | ||
8630 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
8631 | begin | |
e606088a | 8632 | if Opt.List_Inherited_Aspects |
b9696ffb | 8633 | and then Is_Subprogram_Or_Generic_Subprogram (E) |
beacce02 AC |
8634 | then |
8635 | declare | |
c9d70ab1 AC |
8636 | Subps : constant Subprogram_List := Inherited_Subprograms (E); |
8637 | Items : Node_Id; | |
8638 | Prag : Node_Id; | |
beacce02 AC |
8639 | |
8640 | begin | |
c9d70ab1 AC |
8641 | for Index in Subps'Range loop |
8642 | Items := Contract (Subps (Index)); | |
8643 | ||
8644 | if Present (Items) then | |
8645 | Prag := Pre_Post_Conditions (Items); | |
8646 | while Present (Prag) loop | |
8647 | Error_Msg_Sloc := Sloc (Prag); | |
8648 | ||
8649 | if Class_Present (Prag) | |
8650 | and then not Split_PPC (Prag) | |
8651 | then | |
8652 | if Pragma_Name (Prag) = Name_Precondition then | |
8653 | Error_Msg_N | |
8654 | ("info: & inherits `Pre''Class` aspect from " | |
8655 | & "#?L?", E); | |
8656 | else | |
8657 | Error_Msg_N | |
8658 | ("info: & inherits `Post''Class` aspect from " | |
8659 | & "#?L?", E); | |
8660 | end if; | |
beacce02 | 8661 | end if; |
beacce02 | 8662 | |
c9d70ab1 AC |
8663 | Prag := Next_Pragma (Prag); |
8664 | end loop; | |
8665 | end if; | |
beacce02 AC |
8666 | end loop; |
8667 | end; | |
8668 | end if; | |
8669 | end List_Inherited_Pre_Post_Aspects; | |
8670 | ||
996ae0b0 RK |
8671 | ------------------------------ |
8672 | -- Make_Inequality_Operator -- | |
8673 | ------------------------------ | |
8674 | ||
8675 | -- S is the defining identifier of an equality operator. We build a | |
8676 | -- subprogram declaration with the right signature. This operation is | |
8677 | -- intrinsic, because it is always expanded as the negation of the | |
8678 | -- call to the equality function. | |
8679 | ||
8680 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
8681 | Loc : constant Source_Ptr := Sloc (S); | |
8682 | Decl : Node_Id; | |
8683 | Formals : List_Id; | |
8684 | Op_Name : Entity_Id; | |
8685 | ||
c8ef728f ES |
8686 | FF : constant Entity_Id := First_Formal (S); |
8687 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
8688 | |
8689 | begin | |
c8ef728f | 8690 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 8691 | |
c8ef728f | 8692 | if No (NF) then |
996ae0b0 RK |
8693 | return; |
8694 | end if; | |
8695 | ||
c8ef728f ES |
8696 | declare |
8697 | A : constant Entity_Id := | |
8698 | Make_Defining_Identifier (Sloc (FF), | |
8699 | Chars => Chars (FF)); | |
8700 | ||
5d37ba92 ES |
8701 | B : constant Entity_Id := |
8702 | Make_Defining_Identifier (Sloc (NF), | |
8703 | Chars => Chars (NF)); | |
c8ef728f ES |
8704 | |
8705 | begin | |
8706 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
8707 | ||
8708 | Formals := New_List ( | |
8709 | Make_Parameter_Specification (Loc, | |
8710 | Defining_Identifier => A, | |
8711 | Parameter_Type => | |
e4494292 | 8712 | New_Occurrence_Of (Etype (First_Formal (S)), |
c8ef728f ES |
8713 | Sloc (Etype (First_Formal (S))))), |
8714 | ||
8715 | Make_Parameter_Specification (Loc, | |
8716 | Defining_Identifier => B, | |
8717 | Parameter_Type => | |
e4494292 | 8718 | New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
c8ef728f ES |
8719 | Sloc (Etype (Next_Formal (First_Formal (S))))))); |
8720 | ||
8721 | Decl := | |
8722 | Make_Subprogram_Declaration (Loc, | |
8723 | Specification => | |
8724 | Make_Function_Specification (Loc, | |
8725 | Defining_Unit_Name => Op_Name, | |
8726 | Parameter_Specifications => Formals, | |
8727 | Result_Definition => | |
e4494292 | 8728 | New_Occurrence_Of (Standard_Boolean, Loc))); |
c8ef728f ES |
8729 | |
8730 | -- Insert inequality right after equality if it is explicit or after | |
8731 | -- the derived type when implicit. These entities are created only | |
2995860f AC |
8732 | -- for visibility purposes, and eventually replaced in the course |
8733 | -- of expansion, so they do not need to be attached to the tree and | |
8734 | -- seen by the back-end. Keeping them internal also avoids spurious | |
c8ef728f ES |
8735 | -- freezing problems. The declaration is inserted in the tree for |
8736 | -- analysis, and removed afterwards. If the equality operator comes | |
8737 | -- from an explicit declaration, attach the inequality immediately | |
8738 | -- after. Else the equality is inherited from a derived type | |
8739 | -- declaration, so insert inequality after that declaration. | |
8740 | ||
8741 | if No (Alias (S)) then | |
8742 | Insert_After (Unit_Declaration_Node (S), Decl); | |
8743 | elsif Is_List_Member (Parent (S)) then | |
8744 | Insert_After (Parent (S), Decl); | |
8745 | else | |
8746 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
8747 | end if; | |
996ae0b0 | 8748 | |
c8ef728f ES |
8749 | Mark_Rewrite_Insertion (Decl); |
8750 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
8751 | Analyze (Decl); | |
8752 | Remove (Decl); | |
8753 | Set_Has_Completion (Op_Name); | |
8754 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 8755 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 8756 | end; |
996ae0b0 RK |
8757 | end Make_Inequality_Operator; |
8758 | ||
8759 | ---------------------- | |
8760 | -- May_Need_Actuals -- | |
8761 | ---------------------- | |
8762 | ||
8763 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
8764 | F : Entity_Id; | |
8765 | B : Boolean; | |
8766 | ||
8767 | begin | |
8768 | F := First_Formal (Fun); | |
8769 | B := True; | |
996ae0b0 RK |
8770 | while Present (F) loop |
8771 | if No (Default_Value (F)) then | |
8772 | B := False; | |
8773 | exit; | |
8774 | end if; | |
8775 | ||
8776 | Next_Formal (F); | |
8777 | end loop; | |
8778 | ||
8779 | Set_Needs_No_Actuals (Fun, B); | |
8780 | end May_Need_Actuals; | |
8781 | ||
8782 | --------------------- | |
8783 | -- Mode_Conformant -- | |
8784 | --------------------- | |
8785 | ||
8786 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
8787 | Result : Boolean; | |
996ae0b0 RK |
8788 | begin |
8789 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
8790 | return Result; | |
8791 | end Mode_Conformant; | |
8792 | ||
8793 | --------------------------- | |
8794 | -- New_Overloaded_Entity -- | |
8795 | --------------------------- | |
8796 | ||
8797 | procedure New_Overloaded_Entity | |
8798 | (S : Entity_Id; | |
8799 | Derived_Type : Entity_Id := Empty) | |
8800 | is | |
ec4867fa | 8801 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
8802 | -- Set if the current scope has an operation that is type-conformant |
8803 | -- with S, and becomes hidden by S. | |
8804 | ||
5d37ba92 ES |
8805 | Is_Primitive_Subp : Boolean; |
8806 | -- Set to True if the new subprogram is primitive | |
8807 | ||
fbf5a39b AC |
8808 | E : Entity_Id; |
8809 | -- Entity that S overrides | |
8810 | ||
996ae0b0 | 8811 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
8812 | -- Predecessor of E in Homonym chain |
8813 | ||
5d37ba92 ES |
8814 | procedure Check_For_Primitive_Subprogram |
8815 | (Is_Primitive : out Boolean; | |
8816 | Is_Overriding : Boolean := False); | |
8817 | -- If the subprogram being analyzed is a primitive operation of the type | |
8818 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
8819 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
8820 | -- corresponding flag on the entity itself for later use. | |
8821 | ||
ec4867fa ES |
8822 | procedure Check_Synchronized_Overriding |
8823 | (Def_Id : Entity_Id; | |
ec4867fa ES |
8824 | Overridden_Subp : out Entity_Id); |
8825 | -- First determine if Def_Id is an entry or a subprogram either defined | |
8826 | -- in the scope of a task or protected type, or is a primitive of such | |
8827 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
8828 | -- implemented by the synchronized type, return the overridden entity | |
8829 | -- or Empty. | |
758c442c | 8830 | |
996ae0b0 RK |
8831 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
8832 | -- Check that E is declared in the private part of the current package, | |
8833 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 8834 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
8835 | -- set when freezing entities, so we must examine the place of the |
8836 | -- declaration in the tree, and recognize wrapper packages as well. | |
8837 | ||
2ddc2000 AC |
8838 | function Is_Overriding_Alias |
8839 | (Old_E : Entity_Id; | |
8840 | New_E : Entity_Id) return Boolean; | |
8841 | -- Check whether new subprogram and old subprogram are both inherited | |
8842 | -- from subprograms that have distinct dispatch table entries. This can | |
2995860f AC |
8843 | -- occur with derivations from instances with accidental homonyms. The |
8844 | -- function is conservative given that the converse is only true within | |
8845 | -- instances that contain accidental overloadings. | |
2ddc2000 | 8846 | |
5d37ba92 ES |
8847 | ------------------------------------ |
8848 | -- Check_For_Primitive_Subprogram -- | |
8849 | ------------------------------------ | |
996ae0b0 | 8850 | |
5d37ba92 ES |
8851 | procedure Check_For_Primitive_Subprogram |
8852 | (Is_Primitive : out Boolean; | |
8853 | Is_Overriding : Boolean := False) | |
ec4867fa | 8854 | is |
996ae0b0 RK |
8855 | Formal : Entity_Id; |
8856 | F_Typ : Entity_Id; | |
07fc65c4 | 8857 | B_Typ : Entity_Id; |
996ae0b0 RK |
8858 | |
8859 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
8860 | -- Returns true if T is declared in the visible part of the current |
8861 | -- package scope; otherwise returns false. Assumes that T is declared | |
8862 | -- in a package. | |
996ae0b0 RK |
8863 | |
8864 | procedure Check_Private_Overriding (T : Entity_Id); | |
8865 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
8866 | -- abstract type is declared in a private part, then it must override |
8867 | -- an abstract subprogram declared in the visible part. Also checks | |
8868 | -- that if a primitive function with a controlling result is declared | |
8869 | -- in a private part, then it must override a function declared in | |
8870 | -- the visible part. | |
996ae0b0 RK |
8871 | |
8872 | ------------------------------ | |
8873 | -- Check_Private_Overriding -- | |
8874 | ------------------------------ | |
8875 | ||
8876 | procedure Check_Private_Overriding (T : Entity_Id) is | |
acf624f2 | 8877 | |
aaeb3b3a AC |
8878 | function Overrides_Visible_Function |
8879 | (Partial_View : Entity_Id) return Boolean; | |
acf624f2 BD |
8880 | -- True if S overrides a function in the visible part. The |
8881 | -- overridden function could be explicitly or implicitly declared. | |
8882 | ||
aaeb3b3a AC |
8883 | function Overrides_Visible_Function |
8884 | (Partial_View : Entity_Id) return Boolean | |
8885 | is | |
acf624f2 BD |
8886 | begin |
8887 | if not Is_Overriding or else not Has_Homonym (S) then | |
8888 | return False; | |
8889 | end if; | |
8890 | ||
aaeb3b3a | 8891 | if not Present (Partial_View) then |
acf624f2 BD |
8892 | return True; |
8893 | end if; | |
8894 | ||
8895 | -- Search through all the homonyms H of S in the current | |
8896 | -- package spec, and return True if we find one that matches. | |
8897 | -- Note that Parent (H) will be the declaration of the | |
aaeb3b3a | 8898 | -- partial view of T for a match. |
acf624f2 BD |
8899 | |
8900 | declare | |
8901 | H : Entity_Id := S; | |
8902 | begin | |
8903 | loop | |
8904 | H := Homonym (H); | |
8905 | exit when not Present (H) or else Scope (H) /= Scope (S); | |
8906 | ||
8907 | if Nkind_In | |
8908 | (Parent (H), | |
8909 | N_Private_Extension_Declaration, | |
8910 | N_Private_Type_Declaration) | |
aaeb3b3a | 8911 | and then Defining_Identifier (Parent (H)) = Partial_View |
acf624f2 BD |
8912 | then |
8913 | return True; | |
8914 | end if; | |
8915 | end loop; | |
8916 | end; | |
8917 | ||
8918 | return False; | |
8919 | end Overrides_Visible_Function; | |
8920 | ||
8921 | -- Start of processing for Check_Private_Overriding | |
8922 | ||
996ae0b0 | 8923 | begin |
51c16e29 | 8924 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
8925 | and then In_Private_Part (Current_Scope) |
8926 | and then Visible_Part_Type (T) | |
8927 | and then not In_Instance | |
8928 | then | |
f937473f RD |
8929 | if Is_Abstract_Type (T) |
8930 | and then Is_Abstract_Subprogram (S) | |
8931 | and then (not Is_Overriding | |
8dbd1460 | 8932 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 8933 | then |
3ccedacc AC |
8934 | Error_Msg_N ("abstract subprograms must be visible " |
8935 | & "(RM 3.9.3(10))!", S); | |
758c442c | 8936 | |
aaeb3b3a AC |
8937 | elsif Ekind (S) = E_Function then |
8938 | declare | |
8939 | Partial_View : constant Entity_Id := | |
8940 | Incomplete_Or_Partial_View (T); | |
2e79de51 | 8941 | |
aaeb3b3a AC |
8942 | begin |
8943 | if not Overrides_Visible_Function (Partial_View) then | |
8944 | ||
8945 | -- Here, S is "function ... return T;" declared in | |
8946 | -- the private part, not overriding some visible | |
8947 | -- operation. That's illegal in the tagged case | |
8948 | -- (but not if the private type is untagged). | |
8949 | ||
8950 | if ((Present (Partial_View) | |
8951 | and then Is_Tagged_Type (Partial_View)) | |
8952 | or else (not Present (Partial_View) | |
8953 | and then Is_Tagged_Type (T))) | |
8954 | and then T = Base_Type (Etype (S)) | |
8955 | then | |
8956 | Error_Msg_N | |
8957 | ("private function with tagged result must" | |
8958 | & " override visible-part function", S); | |
8959 | Error_Msg_N | |
8960 | ("\move subprogram to the visible part" | |
8961 | & " (RM 3.9.3(10))", S); | |
8962 | ||
8963 | -- AI05-0073: extend this test to the case of a | |
8964 | -- function with a controlling access result. | |
8965 | ||
8966 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
8967 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
8968 | and then | |
8969 | not Is_Class_Wide_Type | |
8970 | (Designated_Type (Etype (S))) | |
8971 | and then Ada_Version >= Ada_2012 | |
8972 | then | |
8973 | Error_Msg_N | |
8974 | ("private function with controlling access " | |
8975 | & "result must override visible-part function", | |
8976 | S); | |
8977 | Error_Msg_N | |
8978 | ("\move subprogram to the visible part" | |
8979 | & " (RM 3.9.3(10))", S); | |
8980 | end if; | |
8981 | end if; | |
8982 | end; | |
996ae0b0 RK |
8983 | end if; |
8984 | end if; | |
8985 | end Check_Private_Overriding; | |
8986 | ||
8987 | ----------------------- | |
8988 | -- Visible_Part_Type -- | |
8989 | ----------------------- | |
8990 | ||
8991 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
8992 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
8993 | N : Node_Id; | |
996ae0b0 RK |
8994 | |
8995 | begin | |
8dbd1460 AC |
8996 | -- If the entity is a private type, then it must be declared in a |
8997 | -- visible part. | |
996ae0b0 RK |
8998 | |
8999 | if Ekind (T) in Private_Kind then | |
9000 | return True; | |
9001 | end if; | |
9002 | ||
9003 | -- Otherwise, we traverse the visible part looking for its | |
9004 | -- corresponding declaration. We cannot use the declaration | |
9005 | -- node directly because in the private part the entity of a | |
9006 | -- private type is the one in the full view, which does not | |
9007 | -- indicate that it is the completion of something visible. | |
9008 | ||
07fc65c4 | 9009 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
9010 | while Present (N) loop |
9011 | if Nkind (N) = N_Full_Type_Declaration | |
9012 | and then Present (Defining_Identifier (N)) | |
9013 | and then T = Defining_Identifier (N) | |
9014 | then | |
9015 | return True; | |
9016 | ||
800621e0 RD |
9017 | elsif Nkind_In (N, N_Private_Type_Declaration, |
9018 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
9019 | and then Present (Defining_Identifier (N)) |
9020 | and then T = Full_View (Defining_Identifier (N)) | |
9021 | then | |
9022 | return True; | |
9023 | end if; | |
9024 | ||
9025 | Next (N); | |
9026 | end loop; | |
9027 | ||
9028 | return False; | |
9029 | end Visible_Part_Type; | |
9030 | ||
5d37ba92 | 9031 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
9032 | |
9033 | begin | |
5d37ba92 ES |
9034 | Is_Primitive := False; |
9035 | ||
996ae0b0 RK |
9036 | if not Comes_From_Source (S) then |
9037 | null; | |
9038 | ||
5d37ba92 | 9039 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
9040 | |
9041 | elsif Current_Scope = Standard_Standard then | |
9042 | null; | |
9043 | ||
b9b2405f | 9044 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 9045 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 9046 | or else Is_Overriding |
996ae0b0 | 9047 | then |
07fc65c4 | 9048 | -- For function, check return type |
996ae0b0 | 9049 | |
07fc65c4 | 9050 | if Ekind (S) = E_Function then |
5d37ba92 ES |
9051 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
9052 | F_Typ := Designated_Type (Etype (S)); | |
9053 | else | |
9054 | F_Typ := Etype (S); | |
9055 | end if; | |
9056 | ||
9057 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 9058 | |
5d37ba92 ES |
9059 | if Scope (B_Typ) = Current_Scope |
9060 | and then not Is_Class_Wide_Type (B_Typ) | |
9061 | and then not Is_Generic_Type (B_Typ) | |
9062 | then | |
9063 | Is_Primitive := True; | |
07fc65c4 | 9064 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 9065 | Set_Is_Primitive (S); |
07fc65c4 GB |
9066 | Check_Private_Overriding (B_Typ); |
9067 | end if; | |
996ae0b0 RK |
9068 | end if; |
9069 | ||
07fc65c4 | 9070 | -- For all subprograms, check formals |
996ae0b0 | 9071 | |
07fc65c4 | 9072 | Formal := First_Formal (S); |
996ae0b0 RK |
9073 | while Present (Formal) loop |
9074 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
9075 | F_Typ := Designated_Type (Etype (Formal)); | |
9076 | else | |
9077 | F_Typ := Etype (Formal); | |
9078 | end if; | |
9079 | ||
07fc65c4 GB |
9080 | B_Typ := Base_Type (F_Typ); |
9081 | ||
ec4867fa ES |
9082 | if Ekind (B_Typ) = E_Access_Subtype then |
9083 | B_Typ := Base_Type (B_Typ); | |
9084 | end if; | |
9085 | ||
5d37ba92 ES |
9086 | if Scope (B_Typ) = Current_Scope |
9087 | and then not Is_Class_Wide_Type (B_Typ) | |
9088 | and then not Is_Generic_Type (B_Typ) | |
9089 | then | |
9090 | Is_Primitive := True; | |
9091 | Set_Is_Primitive (S); | |
07fc65c4 GB |
9092 | Set_Has_Primitive_Operations (B_Typ); |
9093 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
9094 | end if; |
9095 | ||
9096 | Next_Formal (Formal); | |
9097 | end loop; | |
1aee1fb3 AC |
9098 | |
9099 | -- Special case: An equality function can be redefined for a type | |
9100 | -- occurring in a declarative part, and won't otherwise be treated as | |
9101 | -- a primitive because it doesn't occur in a package spec and doesn't | |
9102 | -- override an inherited subprogram. It's important that we mark it | |
9103 | -- primitive so it can be returned by Collect_Primitive_Operations | |
9104 | -- and be used in composing the equality operation of later types | |
9105 | -- that have a component of the type. | |
9106 | ||
9107 | elsif Chars (S) = Name_Op_Eq | |
9108 | and then Etype (S) = Standard_Boolean | |
9109 | then | |
9110 | B_Typ := Base_Type (Etype (First_Formal (S))); | |
9111 | ||
9112 | if Scope (B_Typ) = Current_Scope | |
9113 | and then | |
9114 | Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ | |
9115 | and then not Is_Limited_Type (B_Typ) | |
9116 | then | |
9117 | Is_Primitive := True; | |
9118 | Set_Is_Primitive (S); | |
9119 | Set_Has_Primitive_Operations (B_Typ); | |
9120 | Check_Private_Overriding (B_Typ); | |
9121 | end if; | |
996ae0b0 | 9122 | end if; |
5d37ba92 ES |
9123 | end Check_For_Primitive_Subprogram; |
9124 | ||
9125 | ----------------------------------- | |
9126 | -- Check_Synchronized_Overriding -- | |
9127 | ----------------------------------- | |
9128 | ||
9129 | procedure Check_Synchronized_Overriding | |
9130 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
9131 | Overridden_Subp : out Entity_Id) |
9132 | is | |
5d37ba92 ES |
9133 | Ifaces_List : Elist_Id; |
9134 | In_Scope : Boolean; | |
9135 | Typ : Entity_Id; | |
9136 | ||
8aa15e3b JM |
9137 | function Matches_Prefixed_View_Profile |
9138 | (Prim_Params : List_Id; | |
9139 | Iface_Params : List_Id) return Boolean; | |
9140 | -- Determine whether a subprogram's parameter profile Prim_Params | |
9141 | -- matches that of a potentially overridden interface subprogram | |
9142 | -- Iface_Params. Also determine if the type of first parameter of | |
9143 | -- Iface_Params is an implemented interface. | |
9144 | ||
8aa15e3b JM |
9145 | ----------------------------------- |
9146 | -- Matches_Prefixed_View_Profile -- | |
9147 | ----------------------------------- | |
9148 | ||
9149 | function Matches_Prefixed_View_Profile | |
9150 | (Prim_Params : List_Id; | |
9151 | Iface_Params : List_Id) return Boolean | |
9152 | is | |
9153 | Iface_Id : Entity_Id; | |
9154 | Iface_Param : Node_Id; | |
9155 | Iface_Typ : Entity_Id; | |
9156 | Prim_Id : Entity_Id; | |
9157 | Prim_Param : Node_Id; | |
9158 | Prim_Typ : Entity_Id; | |
9159 | ||
9160 | function Is_Implemented | |
9161 | (Ifaces_List : Elist_Id; | |
9162 | Iface : Entity_Id) return Boolean; | |
9163 | -- Determine if Iface is implemented by the current task or | |
9164 | -- protected type. | |
9165 | ||
9166 | -------------------- | |
9167 | -- Is_Implemented -- | |
9168 | -------------------- | |
9169 | ||
9170 | function Is_Implemented | |
9171 | (Ifaces_List : Elist_Id; | |
9172 | Iface : Entity_Id) return Boolean | |
9173 | is | |
9174 | Iface_Elmt : Elmt_Id; | |
9175 | ||
9176 | begin | |
9177 | Iface_Elmt := First_Elmt (Ifaces_List); | |
9178 | while Present (Iface_Elmt) loop | |
9179 | if Node (Iface_Elmt) = Iface then | |
9180 | return True; | |
9181 | end if; | |
9182 | ||
9183 | Next_Elmt (Iface_Elmt); | |
9184 | end loop; | |
9185 | ||
9186 | return False; | |
9187 | end Is_Implemented; | |
9188 | ||
9189 | -- Start of processing for Matches_Prefixed_View_Profile | |
9190 | ||
9191 | begin | |
9192 | Iface_Param := First (Iface_Params); | |
9193 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
9194 | ||
9195 | if Is_Access_Type (Iface_Typ) then | |
9196 | Iface_Typ := Designated_Type (Iface_Typ); | |
9197 | end if; | |
9198 | ||
9199 | Prim_Param := First (Prim_Params); | |
9200 | ||
9201 | -- The first parameter of the potentially overridden subprogram | |
9202 | -- must be an interface implemented by Prim. | |
9203 | ||
9204 | if not Is_Interface (Iface_Typ) | |
9205 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
9206 | then | |
9207 | return False; | |
9208 | end if; | |
9209 | ||
9210 | -- The checks on the object parameters are done, move onto the | |
9211 | -- rest of the parameters. | |
9212 | ||
9213 | if not In_Scope then | |
9214 | Prim_Param := Next (Prim_Param); | |
9215 | end if; | |
9216 | ||
9217 | Iface_Param := Next (Iface_Param); | |
9218 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
9219 | Iface_Id := Defining_Identifier (Iface_Param); | |
9220 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
9221 | ||
8aa15e3b JM |
9222 | Prim_Id := Defining_Identifier (Prim_Param); |
9223 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
9224 | ||
15e4986c JM |
9225 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
9226 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
9227 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
9228 | then | |
9229 | Iface_Typ := Designated_Type (Iface_Typ); | |
9230 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
9231 | end if; |
9232 | ||
9233 | -- Case of multiple interface types inside a parameter profile | |
9234 | ||
9235 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
9236 | ||
9237 | -- If the interface type is implemented, then the matching type | |
9238 | -- in the primitive should be the implementing record type. | |
9239 | ||
9240 | if Ekind (Iface_Typ) = E_Record_Type | |
9241 | and then Is_Interface (Iface_Typ) | |
9242 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
9243 | then | |
9244 | if Prim_Typ /= Typ then | |
9245 | return False; | |
9246 | end if; | |
9247 | ||
9248 | -- The two parameters must be both mode and subtype conformant | |
9249 | ||
9250 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
9251 | or else not | |
9252 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
9253 | then | |
9254 | return False; | |
9255 | end if; | |
9256 | ||
9257 | Next (Iface_Param); | |
9258 | Next (Prim_Param); | |
9259 | end loop; | |
9260 | ||
9261 | -- One of the two lists contains more parameters than the other | |
9262 | ||
9263 | if Present (Iface_Param) or else Present (Prim_Param) then | |
9264 | return False; | |
9265 | end if; | |
9266 | ||
9267 | return True; | |
9268 | end Matches_Prefixed_View_Profile; | |
9269 | ||
9270 | -- Start of processing for Check_Synchronized_Overriding | |
9271 | ||
5d37ba92 ES |
9272 | begin |
9273 | Overridden_Subp := Empty; | |
9274 | ||
8aa15e3b JM |
9275 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
9276 | -- primitives internally generated by the frontend; however at this | |
9277 | -- stage predefined primitives are still not fully decorated. As a | |
9278 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 9279 | |
8aa15e3b JM |
9280 | if (Ekind (Def_Id) /= E_Entry |
9281 | and then Ekind (Def_Id) /= E_Function | |
9282 | and then Ekind (Def_Id) /= E_Procedure) | |
9283 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
9284 | then |
9285 | return; | |
9286 | end if; | |
9287 | ||
9288 | -- Search for the concurrent declaration since it contains the list | |
9289 | -- of all implemented interfaces. In this case, the subprogram is | |
9290 | -- declared within the scope of a protected or a task type. | |
9291 | ||
9292 | if Present (Scope (Def_Id)) | |
9293 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
9294 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
9295 | then | |
9296 | Typ := Scope (Def_Id); | |
9297 | In_Scope := True; | |
9298 | ||
8aa15e3b | 9299 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 9300 | -- has no formals. |
8aa15e3b JM |
9301 | |
9302 | elsif No (First_Formal (Def_Id)) then | |
9303 | return; | |
5d37ba92 | 9304 | |
8aa15e3b | 9305 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 9306 | -- concurrent type. |
5d37ba92 | 9307 | |
8aa15e3b JM |
9308 | else |
9309 | Typ := Etype (First_Formal (Def_Id)); | |
9310 | ||
9311 | if Is_Access_Type (Typ) then | |
9312 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
9313 | end if; |
9314 | ||
8aa15e3b JM |
9315 | if Is_Concurrent_Type (Typ) |
9316 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 9317 | then |
5d37ba92 ES |
9318 | In_Scope := False; |
9319 | ||
9320 | -- This case occurs when the concurrent type is declared within | |
9321 | -- a generic unit. As a result the corresponding record has been | |
9322 | -- built and used as the type of the first formal, we just have | |
9323 | -- to retrieve the corresponding concurrent type. | |
9324 | ||
8aa15e3b | 9325 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 9326 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 9327 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 9328 | then |
8aa15e3b | 9329 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
9330 | In_Scope := False; |
9331 | ||
9332 | else | |
9333 | return; | |
9334 | end if; | |
8aa15e3b JM |
9335 | end if; |
9336 | ||
9337 | -- There is no overriding to check if is an inherited operation in a | |
9338 | -- type derivation on for a generic actual. | |
9339 | ||
9340 | Collect_Interfaces (Typ, Ifaces_List); | |
9341 | ||
9342 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
9343 | return; |
9344 | end if; | |
9345 | ||
8aa15e3b JM |
9346 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
9347 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 9348 | |
8aa15e3b JM |
9349 | declare |
9350 | Candidate : Entity_Id := Empty; | |
9351 | Hom : Entity_Id := Empty; | |
8aa15e3b JM |
9352 | Subp : Entity_Id := Empty; |
9353 | ||
9354 | begin | |
4adf3c50 | 9355 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
9356 | -- overridden subprogram that belongs to an implemented |
9357 | -- interface. | |
9358 | ||
9359 | Hom := Current_Entity_In_Scope (Def_Id); | |
9360 | while Present (Hom) loop | |
9361 | Subp := Hom; | |
9362 | ||
15e4986c JM |
9363 | if Subp = Def_Id |
9364 | or else not Is_Overloadable (Subp) | |
9365 | or else not Is_Primitive (Subp) | |
9366 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 9367 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 9368 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 9369 | then |
15e4986c | 9370 | null; |
8aa15e3b | 9371 | |
15e4986c | 9372 | -- Entries and procedures can override abstract or null |
4adf3c50 | 9373 | -- interface procedures. |
8aa15e3b | 9374 | |
15e4986c | 9375 | elsif (Ekind (Def_Id) = E_Procedure |
8fde064e | 9376 | or else Ekind (Def_Id) = E_Entry) |
8aa15e3b | 9377 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
9378 | and then Matches_Prefixed_View_Profile |
9379 | (Parameter_Specifications (Parent (Def_Id)), | |
9380 | Parameter_Specifications (Parent (Subp))) | |
9381 | then | |
9382 | Candidate := Subp; | |
9383 | ||
15e4986c JM |
9384 | -- For an overridden subprogram Subp, check whether the mode |
9385 | -- of its first parameter is correct depending on the kind | |
9386 | -- of synchronized type. | |
8aa15e3b | 9387 | |
15e4986c JM |
9388 | declare |
9389 | Formal : constant Node_Id := First_Formal (Candidate); | |
9390 | ||
9391 | begin | |
9392 | -- In order for an entry or a protected procedure to | |
9393 | -- override, the first parameter of the overridden | |
9394 | -- routine must be of mode "out", "in out" or | |
9395 | -- access-to-variable. | |
9396 | ||
8fde064e | 9397 | if Ekind_In (Candidate, E_Entry, E_Procedure) |
15e4986c JM |
9398 | and then Is_Protected_Type (Typ) |
9399 | and then Ekind (Formal) /= E_In_Out_Parameter | |
9400 | and then Ekind (Formal) /= E_Out_Parameter | |
8fde064e AC |
9401 | and then Nkind (Parameter_Type (Parent (Formal))) /= |
9402 | N_Access_Definition | |
15e4986c JM |
9403 | then |
9404 | null; | |
9405 | ||
9406 | -- All other cases are OK since a task entry or routine | |
9407 | -- does not have a restriction on the mode of the first | |
9408 | -- parameter of the overridden interface routine. | |
9409 | ||
9410 | else | |
9411 | Overridden_Subp := Candidate; | |
9412 | return; | |
9413 | end if; | |
9414 | end; | |
8aa15e3b JM |
9415 | |
9416 | -- Functions can override abstract interface functions | |
9417 | ||
9418 | elsif Ekind (Def_Id) = E_Function | |
9419 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
9420 | and then Matches_Prefixed_View_Profile |
9421 | (Parameter_Specifications (Parent (Def_Id)), | |
9422 | Parameter_Specifications (Parent (Subp))) | |
9423 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
9424 | Etype (Result_Definition (Parent (Subp))) | |
9425 | then | |
273123a4 AC |
9426 | Candidate := Subp; |
9427 | ||
9428 | -- If an inherited subprogram is implemented by a protected | |
9429 | -- function, then the first parameter of the inherited | |
9430 | -- subprogram shall be of mode in, but not an | |
9431 | -- access-to-variable parameter (RM 9.4(11/9) | |
9432 | ||
9433 | if Present (First_Formal (Subp)) | |
9434 | and then Ekind (First_Formal (Subp)) = E_In_Parameter | |
9435 | and then | |
9436 | (not Is_Access_Type (Etype (First_Formal (Subp))) | |
9437 | or else | |
9438 | Is_Access_Constant (Etype (First_Formal (Subp)))) | |
9439 | then | |
9440 | Overridden_Subp := Subp; | |
9441 | return; | |
9442 | end if; | |
8aa15e3b JM |
9443 | end if; |
9444 | ||
9445 | Hom := Homonym (Hom); | |
9446 | end loop; | |
9447 | ||
4adf3c50 AC |
9448 | -- After examining all candidates for overriding, we are left with |
9449 | -- the best match which is a mode incompatible interface routine. | |
8aa15e3b | 9450 | |
273123a4 AC |
9451 | if In_Scope and then Present (Candidate) then |
9452 | Error_Msg_PT (Def_Id, Candidate); | |
5d37ba92 | 9453 | end if; |
8aa15e3b JM |
9454 | |
9455 | Overridden_Subp := Candidate; | |
9456 | return; | |
9457 | end; | |
5d37ba92 ES |
9458 | end Check_Synchronized_Overriding; |
9459 | ||
9460 | ---------------------------- | |
9461 | -- Is_Private_Declaration -- | |
9462 | ---------------------------- | |
9463 | ||
9464 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
9465 | Priv_Decls : List_Id; | |
9466 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
9467 | ||
9468 | begin | |
9469 | if Is_Package_Or_Generic_Package (Current_Scope) | |
9470 | and then In_Private_Part (Current_Scope) | |
9471 | then | |
9472 | Priv_Decls := | |
d12b19fa | 9473 | Private_Declarations (Package_Specification (Current_Scope)); |
5d37ba92 ES |
9474 | |
9475 | return In_Package_Body (Current_Scope) | |
9476 | or else | |
9477 | (Is_List_Member (Decl) | |
a4901c08 | 9478 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 9479 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
9480 | and then not |
9481 | Is_Compilation_Unit | |
9482 | (Defining_Entity (Parent (Decl))) | |
9483 | and then List_Containing (Parent (Parent (Decl))) = | |
9484 | Priv_Decls); | |
5d37ba92 ES |
9485 | else |
9486 | return False; | |
9487 | end if; | |
9488 | end Is_Private_Declaration; | |
996ae0b0 | 9489 | |
2ddc2000 AC |
9490 | -------------------------- |
9491 | -- Is_Overriding_Alias -- | |
9492 | -------------------------- | |
9493 | ||
9494 | function Is_Overriding_Alias | |
9495 | (Old_E : Entity_Id; | |
9496 | New_E : Entity_Id) return Boolean | |
9497 | is | |
9498 | AO : constant Entity_Id := Alias (Old_E); | |
9499 | AN : constant Entity_Id := Alias (New_E); | |
2ddc2000 AC |
9500 | begin |
9501 | return Scope (AO) /= Scope (AN) | |
9502 | or else No (DTC_Entity (AO)) | |
9503 | or else No (DTC_Entity (AN)) | |
9504 | or else DT_Position (AO) = DT_Position (AN); | |
9505 | end Is_Overriding_Alias; | |
9506 | ||
996ae0b0 RK |
9507 | -- Start of processing for New_Overloaded_Entity |
9508 | ||
9509 | begin | |
fbf5a39b AC |
9510 | -- We need to look for an entity that S may override. This must be a |
9511 | -- homonym in the current scope, so we look for the first homonym of | |
9512 | -- S in the current scope as the starting point for the search. | |
9513 | ||
9514 | E := Current_Entity_In_Scope (S); | |
9515 | ||
947430d5 AC |
9516 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
9517 | -- They are directly added to the list of primitive operations of | |
9518 | -- Derived_Type, unless this is a rederivation in the private part | |
9519 | -- of an operation that was already derived in the visible part of | |
9520 | -- the current package. | |
9521 | ||
0791fbe9 | 9522 | if Ada_Version >= Ada_2005 |
947430d5 AC |
9523 | and then Present (Derived_Type) |
9524 | and then Present (Alias (S)) | |
9525 | and then Is_Dispatching_Operation (Alias (S)) | |
9526 | and then Present (Find_Dispatching_Type (Alias (S))) | |
9527 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
9528 | then | |
9529 | -- For private types, when the full-view is processed we propagate to | |
9530 | -- the full view the non-overridden entities whose attribute "alias" | |
9531 | -- references an interface primitive. These entities were added by | |
9532 | -- Derive_Subprograms to ensure that interface primitives are | |
9533 | -- covered. | |
9534 | ||
9535 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
9536 | -- internal entity that links an interface primitive with its | |
9537 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 9538 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
9539 | |
9540 | if Inside_Freezing_Actions = 0 | |
9541 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
9542 | and then In_Private_Part (Current_Scope) | |
9543 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
9544 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
9545 | and then Full_View (Defining_Identifier (Parent (E))) | |
9546 | = Defining_Identifier (Parent (S)) | |
9547 | and then Alias (E) = Alias (S) | |
9548 | then | |
9549 | Check_Operation_From_Private_View (S, E); | |
9550 | Set_Is_Dispatching_Operation (S); | |
9551 | ||
9552 | -- Common case | |
9553 | ||
9554 | else | |
9555 | Enter_Overloaded_Entity (S); | |
9556 | Check_Dispatching_Operation (S, Empty); | |
9557 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
9558 | end if; | |
9559 | ||
9560 | return; | |
9561 | end if; | |
9562 | ||
fbf5a39b AC |
9563 | -- If there is no homonym then this is definitely not overriding |
9564 | ||
996ae0b0 RK |
9565 | if No (E) then |
9566 | Enter_Overloaded_Entity (S); | |
9567 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9568 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 9569 | |
2995860f AC |
9570 | -- If subprogram has an explicit declaration, check whether it has an |
9571 | -- overriding indicator. | |
758c442c | 9572 | |
ec4867fa | 9573 | if Comes_From_Source (S) then |
8aa15e3b | 9574 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
9575 | |
9576 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
9577 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 9578 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
9579 | -- overriding indicator. |
9580 | ||
9581 | if Ada_Version >= Ada_2012 | |
9582 | and then No (Overridden_Subp) | |
9583 | and then Is_Dispatching_Operation (S) | |
038140ed | 9584 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
9585 | then |
9586 | Overridden_Subp := Overridden_Operation (S); | |
9587 | end if; | |
9588 | ||
5d37ba92 ES |
9589 | Check_Overriding_Indicator |
9590 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
758c442c GD |
9591 | end if; |
9592 | ||
fbf5a39b AC |
9593 | -- If there is a homonym that is not overloadable, then we have an |
9594 | -- error, except for the special cases checked explicitly below. | |
9595 | ||
996ae0b0 RK |
9596 | elsif not Is_Overloadable (E) then |
9597 | ||
9598 | -- Check for spurious conflict produced by a subprogram that has the | |
9599 | -- same name as that of the enclosing generic package. The conflict | |
9600 | -- occurs within an instance, between the subprogram and the renaming | |
9601 | -- declaration for the package. After the subprogram, the package | |
9602 | -- renaming declaration becomes hidden. | |
9603 | ||
9604 | if Ekind (E) = E_Package | |
9605 | and then Present (Renamed_Object (E)) | |
9606 | and then Renamed_Object (E) = Current_Scope | |
9607 | and then Nkind (Parent (Renamed_Object (E))) = | |
9608 | N_Package_Specification | |
9609 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
9610 | then | |
9611 | Set_Is_Hidden (E); | |
9612 | Set_Is_Immediately_Visible (E, False); | |
9613 | Enter_Overloaded_Entity (S); | |
9614 | Set_Homonym (S, Homonym (E)); | |
9615 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9616 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
9617 | |
9618 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
9619 | -- declaration. However if it is dispatching, it must appear in the |
9620 | -- dispatch table anyway, because it can be dispatched to even if it | |
9621 | -- cannot be called directly. | |
996ae0b0 | 9622 | |
4adf3c50 | 9623 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
9624 | Set_Scope (S, Current_Scope); |
9625 | ||
9626 | if Is_Dispatching_Operation (Alias (S)) then | |
9627 | Check_Dispatching_Operation (S, Empty); | |
9628 | end if; | |
9629 | ||
9630 | return; | |
9631 | ||
9632 | else | |
9633 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 9634 | |
f3d57416 | 9635 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
9636 | |
9637 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
9638 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
9639 | Error_Msg_N ("\& conflicts with declaration#", S); | |
9640 | else | |
9641 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
9642 | end if; |
9643 | ||
9644 | return; | |
9645 | end if; | |
9646 | ||
fbf5a39b AC |
9647 | -- E exists and is overloadable |
9648 | ||
996ae0b0 | 9649 | else |
8aa15e3b | 9650 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 9651 | |
82c80734 RD |
9652 | -- Loop through E and its homonyms to determine if any of them is |
9653 | -- the candidate for overriding by S. | |
996ae0b0 RK |
9654 | |
9655 | while Present (E) loop | |
fbf5a39b AC |
9656 | |
9657 | -- Definitely not interesting if not in the current scope | |
9658 | ||
996ae0b0 RK |
9659 | if Scope (E) /= Current_Scope then |
9660 | null; | |
9661 | ||
aca90db9 AC |
9662 | -- A function can overload the name of an abstract state. The |
9663 | -- state can be viewed as a function with a profile that cannot | |
9664 | -- be matched by anything. | |
9665 | ||
9666 | elsif Ekind (S) = E_Function | |
9667 | and then Ekind (E) = E_Abstract_State | |
9668 | then | |
9669 | Enter_Overloaded_Entity (S); | |
9670 | return; | |
9671 | ||
2995860f AC |
9672 | -- Ada 2012 (AI05-0165): For internally generated bodies of null |
9673 | -- procedures locate the internally generated spec. We enforce | |
9674 | -- mode conformance since a tagged type may inherit from | |
9675 | -- interfaces several null primitives which differ only in | |
9676 | -- the mode of the formals. | |
25ebc085 AC |
9677 | |
9678 | elsif not Comes_From_Source (S) | |
9679 | and then Is_Null_Procedure (S) | |
9680 | and then not Mode_Conformant (E, S) | |
9681 | then | |
9682 | null; | |
9683 | ||
fbf5a39b AC |
9684 | -- Check if we have type conformance |
9685 | ||
ec4867fa | 9686 | elsif Type_Conformant (E, S) then |
c8ef728f | 9687 | |
82c80734 RD |
9688 | -- If the old and new entities have the same profile and one |
9689 | -- is not the body of the other, then this is an error, unless | |
9690 | -- one of them is implicitly declared. | |
996ae0b0 RK |
9691 | |
9692 | -- There are some cases when both can be implicit, for example | |
9693 | -- when both a literal and a function that overrides it are | |
f3d57416 | 9694 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 9695 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 9696 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 9697 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
9698 | -- the former, and the literal is always the former. In the |
9699 | -- odd case where both are derived operations declared at the | |
9700 | -- same point, both operations should be declared, and in that | |
9701 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
9702 | -- part. This can only occur for certain obscure cases in |
9703 | -- instances, when an operation on a type derived from a formal | |
9704 | -- private type does not override a homograph inherited from | |
9705 | -- the actual. In subsequent derivations of such a type, the | |
9706 | -- DT positions of these operations remain distinct, if they | |
9707 | -- have been set. | |
996ae0b0 RK |
9708 | |
9709 | if Present (Alias (S)) | |
9710 | and then (No (Alias (E)) | |
9711 | or else Comes_From_Source (E) | |
2ddc2000 | 9712 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
9713 | or else |
9714 | (Is_Dispatching_Operation (E) | |
84c0a895 | 9715 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 9716 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 9717 | then |
82c80734 RD |
9718 | -- When an derived operation is overloaded it may be due to |
9719 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
9720 | -- re-inherits. It has to be dealt with. |
9721 | ||
e660dbf7 | 9722 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
9723 | and then In_Private_Part (Current_Scope) |
9724 | then | |
9725 | Check_Operation_From_Private_View (S, E); | |
9726 | end if; | |
9727 | ||
038140ed AC |
9728 | -- In any case the implicit operation remains hidden by the |
9729 | -- existing declaration, which is overriding. Indicate that | |
9730 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 9731 | |
038140ed | 9732 | if Present (Alias (S)) then |
039538bc AC |
9733 | Set_Overridden_Operation (E, Alias (S)); |
9734 | Inherit_Subprogram_Contract (E, Alias (S)); | |
9735 | ||
038140ed | 9736 | else |
039538bc AC |
9737 | Set_Overridden_Operation (E, S); |
9738 | Inherit_Subprogram_Contract (E, S); | |
038140ed | 9739 | end if; |
758c442c GD |
9740 | |
9741 | if Comes_From_Source (E) then | |
5d37ba92 | 9742 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
758c442c GD |
9743 | end if; |
9744 | ||
996ae0b0 RK |
9745 | return; |
9746 | ||
26a43556 AC |
9747 | -- Within an instance, the renaming declarations for actual |
9748 | -- subprograms may become ambiguous, but they do not hide each | |
9749 | -- other. | |
996ae0b0 RK |
9750 | |
9751 | elsif Ekind (E) /= E_Entry | |
9752 | and then not Comes_From_Source (E) | |
9753 | and then not Is_Generic_Instance (E) | |
9754 | and then (Present (Alias (E)) | |
9755 | or else Is_Intrinsic_Subprogram (E)) | |
9756 | and then (not In_Instance | |
9757 | or else No (Parent (E)) | |
9758 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 9759 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 9760 | then |
26a43556 AC |
9761 | -- A subprogram child unit is not allowed to override an |
9762 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
9763 | |
9764 | if Is_Child_Unit (S) then | |
9765 | Error_Msg_N | |
9766 | ("child unit overrides inherited subprogram in parent", | |
9767 | S); | |
9768 | return; | |
9769 | end if; | |
9770 | ||
9771 | if Is_Non_Overriding_Operation (E, S) then | |
9772 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 9773 | |
c8ef728f | 9774 | if No (Derived_Type) |
996ae0b0 RK |
9775 | or else Is_Tagged_Type (Derived_Type) |
9776 | then | |
9777 | Check_Dispatching_Operation (S, Empty); | |
9778 | end if; | |
9779 | ||
9780 | return; | |
9781 | end if; | |
9782 | ||
9783 | -- E is a derived operation or an internal operator which | |
9784 | -- is being overridden. Remove E from further visibility. | |
9785 | -- Furthermore, if E is a dispatching operation, it must be | |
9786 | -- replaced in the list of primitive operations of its type | |
9787 | -- (see Override_Dispatching_Operation). | |
9788 | ||
ec4867fa | 9789 | Overridden_Subp := E; |
758c442c | 9790 | |
996ae0b0 RK |
9791 | declare |
9792 | Prev : Entity_Id; | |
9793 | ||
9794 | begin | |
9795 | Prev := First_Entity (Current_Scope); | |
8fde064e | 9796 | while Present (Prev) and then Next_Entity (Prev) /= E loop |
996ae0b0 RK |
9797 | Next_Entity (Prev); |
9798 | end loop; | |
9799 | ||
9800 | -- It is possible for E to be in the current scope and | |
9801 | -- yet not in the entity chain. This can only occur in a | |
9802 | -- generic context where E is an implicit concatenation | |
9803 | -- in the formal part, because in a generic body the | |
9804 | -- entity chain starts with the formals. | |
9805 | ||
948ed277 AC |
9806 | -- In GNATprove mode, a wrapper for an operation with |
9807 | -- axiomatization may be a homonym of another declaration | |
9808 | -- for an actual subprogram (needs refinement ???). | |
9809 | ||
9810 | if No (Prev) then | |
9811 | if In_Instance | |
9812 | and then GNATprove_Mode | |
9813 | and then | |
9814 | Nkind (Original_Node (Unit_Declaration_Node (S))) = | |
9815 | N_Subprogram_Renaming_Declaration | |
9816 | then | |
9817 | return; | |
9818 | else | |
9819 | pragma Assert (Chars (E) = Name_Op_Concat); | |
9820 | null; | |
9821 | end if; | |
9822 | end if; | |
996ae0b0 RK |
9823 | |
9824 | -- E must be removed both from the entity_list of the | |
948ed277 | 9825 | -- current scope, and from the visibility chain. |
996ae0b0 RK |
9826 | |
9827 | if Debug_Flag_E then | |
9828 | Write_Str ("Override implicit operation "); | |
9829 | Write_Int (Int (E)); | |
9830 | Write_Eol; | |
9831 | end if; | |
9832 | ||
9833 | -- If E is a predefined concatenation, it stands for four | |
9834 | -- different operations. As a result, a single explicit | |
9835 | -- declaration does not hide it. In a possible ambiguous | |
9836 | -- situation, Disambiguate chooses the user-defined op, | |
9837 | -- so it is correct to retain the previous internal one. | |
9838 | ||
9839 | if Chars (E) /= Name_Op_Concat | |
9840 | or else Ekind (E) /= E_Operator | |
9841 | then | |
9842 | -- For nondispatching derived operations that are | |
9843 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
9844 | -- part of a package, we retain the derived subprogram |
9845 | -- but mark it as not immediately visible. If the | |
9846 | -- derived operation was declared in the visible part | |
9847 | -- then this ensures that it will still be visible | |
9848 | -- outside the package with the proper signature | |
9849 | -- (calls from outside must also be directed to this | |
9850 | -- version rather than the overriding one, unlike the | |
9851 | -- dispatching case). Calls from inside the package | |
9852 | -- will still resolve to the overriding subprogram | |
9853 | -- since the derived one is marked as not visible | |
9854 | -- within the package. | |
996ae0b0 RK |
9855 | |
9856 | -- If the private operation is dispatching, we achieve | |
9857 | -- the overriding by keeping the implicit operation | |
9865d858 | 9858 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
9859 | -- this fashion the proper body is executed in all |
9860 | -- cases, but the original signature is used outside | |
9861 | -- of the package. | |
9862 | ||
9863 | -- If the overriding is not in the private part, we | |
9864 | -- remove the implicit operation altogether. | |
9865 | ||
9866 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
9867 | if not Is_Dispatching_Operation (E) then |
9868 | Set_Is_Immediately_Visible (E, False); | |
9869 | else | |
e895b435 | 9870 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 9871 | -- so nothing else needs to be done here. |
996ae0b0 RK |
9872 | |
9873 | null; | |
9874 | end if; | |
996ae0b0 | 9875 | |
fbf5a39b AC |
9876 | else |
9877 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
9878 | |
9879 | if E = Current_Entity (E) then | |
9880 | Prev_Vis := Empty; | |
9881 | else | |
9882 | Prev_Vis := Current_Entity (E); | |
9883 | while Homonym (Prev_Vis) /= E loop | |
9884 | Prev_Vis := Homonym (Prev_Vis); | |
9885 | end loop; | |
9886 | end if; | |
9887 | ||
9888 | if Prev_Vis /= Empty then | |
9889 | ||
9890 | -- Skip E in the visibility chain | |
9891 | ||
9892 | Set_Homonym (Prev_Vis, Homonym (E)); | |
9893 | ||
9894 | else | |
9895 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
9896 | end if; | |
9897 | ||
9898 | Set_Next_Entity (Prev, Next_Entity (E)); | |
9899 | ||
9900 | if No (Next_Entity (Prev)) then | |
9901 | Set_Last_Entity (Current_Scope, Prev); | |
9902 | end if; | |
996ae0b0 RK |
9903 | end if; |
9904 | end if; | |
9905 | ||
9906 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
9907 | |
9908 | -- For entities generated by Derive_Subprograms the | |
9909 | -- overridden operation is the inherited primitive | |
9910 | -- (which is available through the attribute alias). | |
9911 | ||
9912 | if not (Comes_From_Source (E)) | |
9913 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
9914 | and then Find_Dispatching_Type (E) = |
9915 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
9916 | and then Present (Alias (E)) |
9917 | and then Comes_From_Source (Alias (E)) | |
9918 | then | |
039538bc AC |
9919 | Set_Overridden_Operation (S, Alias (E)); |
9920 | Inherit_Subprogram_Contract (S, Alias (E)); | |
2fe829ae | 9921 | |
6320f5e1 AC |
9922 | -- Normal case of setting entity as overridden |
9923 | ||
9924 | -- Note: Static_Initialization and Overridden_Operation | |
9925 | -- attributes use the same field in subprogram entities. | |
9926 | -- Static_Initialization is only defined for internal | |
9927 | -- initialization procedures, where Overridden_Operation | |
9928 | -- is irrelevant. Therefore the setting of this attribute | |
9929 | -- must check whether the target is an init_proc. | |
9930 | ||
2fe829ae | 9931 | elsif not Is_Init_Proc (S) then |
039538bc AC |
9932 | Set_Overridden_Operation (S, E); |
9933 | Inherit_Subprogram_Contract (S, E); | |
1c1289e7 AC |
9934 | end if; |
9935 | ||
5d37ba92 | 9936 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 9937 | |
fc53fe76 | 9938 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
9939 | -- expanded to override an inherited null procedure, or a |
9940 | -- predefined dispatching primitive then indicate that E | |
038140ed | 9941 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
9942 | |
9943 | if Comes_From_Source (S) | |
9944 | or else | |
9945 | (Present (Parent (S)) | |
9946 | and then | |
9947 | Nkind (Parent (S)) = N_Procedure_Specification | |
9948 | and then | |
9949 | Null_Present (Parent (S))) | |
38ef8ebe AC |
9950 | or else |
9951 | (Present (Alias (E)) | |
f16e8df9 RD |
9952 | and then |
9953 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 9954 | then |
c8ef728f | 9955 | if Present (Alias (E)) then |
039538bc AC |
9956 | Set_Overridden_Operation (S, Alias (E)); |
9957 | Inherit_Subprogram_Contract (S, Alias (E)); | |
41251c60 JM |
9958 | end if; |
9959 | end if; | |
9960 | ||
996ae0b0 | 9961 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 9962 | |
82c80734 | 9963 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 9964 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
9965 | |
9966 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
9967 | Check_Dispatching_Operation (S, E); |
9968 | ||
996ae0b0 RK |
9969 | else |
9970 | Check_Dispatching_Operation (S, Empty); | |
9971 | end if; | |
9972 | ||
5d37ba92 ES |
9973 | Check_For_Primitive_Subprogram |
9974 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
9975 | goto Check_Inequality; |
9976 | end; | |
9977 | ||
9978 | -- Apparent redeclarations in instances can occur when two | |
9979 | -- formal types get the same actual type. The subprograms in | |
9980 | -- in the instance are legal, even if not callable from the | |
9981 | -- outside. Calls from within are disambiguated elsewhere. | |
9982 | -- For dispatching operations in the visible part, the usual | |
9983 | -- rules apply, and operations with the same profile are not | |
9984 | -- legal (B830001). | |
9985 | ||
9986 | elsif (In_Instance_Visible_Part | |
9987 | and then not Is_Dispatching_Operation (E)) | |
9988 | or else In_Instance_Not_Visible | |
9989 | then | |
9990 | null; | |
9991 | ||
9992 | -- Here we have a real error (identical profile) | |
9993 | ||
9994 | else | |
9995 | Error_Msg_Sloc := Sloc (E); | |
9996 | ||
9997 | -- Avoid cascaded errors if the entity appears in | |
9998 | -- subsequent calls. | |
9999 | ||
10000 | Set_Scope (S, Current_Scope); | |
10001 | ||
5d37ba92 ES |
10002 | -- Generate error, with extra useful warning for the case |
10003 | -- of a generic instance with no completion. | |
996ae0b0 RK |
10004 | |
10005 | if Is_Generic_Instance (S) | |
10006 | and then not Has_Completion (E) | |
10007 | then | |
10008 | Error_Msg_N | |
5d37ba92 ES |
10009 | ("instantiation cannot provide body for&", S); |
10010 | Error_Msg_N ("\& conflicts with declaration#", S); | |
10011 | else | |
10012 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
10013 | end if; |
10014 | ||
10015 | return; | |
10016 | end if; | |
10017 | ||
10018 | else | |
c8ef728f ES |
10019 | -- If one subprogram has an access parameter and the other |
10020 | -- a parameter of an access type, calls to either might be | |
10021 | -- ambiguous. Verify that parameters match except for the | |
10022 | -- access parameter. | |
10023 | ||
10024 | if May_Hide_Profile then | |
10025 | declare | |
ec4867fa ES |
10026 | F1 : Entity_Id; |
10027 | F2 : Entity_Id; | |
8dbd1460 | 10028 | |
c8ef728f ES |
10029 | begin |
10030 | F1 := First_Formal (S); | |
10031 | F2 := First_Formal (E); | |
10032 | while Present (F1) and then Present (F2) loop | |
10033 | if Is_Access_Type (Etype (F1)) then | |
10034 | if not Is_Access_Type (Etype (F2)) | |
10035 | or else not Conforming_Types | |
10036 | (Designated_Type (Etype (F1)), | |
10037 | Designated_Type (Etype (F2)), | |
10038 | Type_Conformant) | |
10039 | then | |
10040 | May_Hide_Profile := False; | |
10041 | end if; | |
10042 | ||
10043 | elsif | |
10044 | not Conforming_Types | |
10045 | (Etype (F1), Etype (F2), Type_Conformant) | |
10046 | then | |
10047 | May_Hide_Profile := False; | |
10048 | end if; | |
10049 | ||
10050 | Next_Formal (F1); | |
10051 | Next_Formal (F2); | |
10052 | end loop; | |
10053 | ||
10054 | if May_Hide_Profile | |
10055 | and then No (F1) | |
10056 | and then No (F2) | |
10057 | then | |
dbfeb4fa | 10058 | Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
c8ef728f ES |
10059 | end if; |
10060 | end; | |
10061 | end if; | |
996ae0b0 RK |
10062 | end if; |
10063 | ||
996ae0b0 RK |
10064 | E := Homonym (E); |
10065 | end loop; | |
10066 | ||
10067 | -- On exit, we know that S is a new entity | |
10068 | ||
10069 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
10070 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
10071 | Check_Overriding_Indicator | |
10072 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 10073 | |
c4d67e2d | 10074 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 10075 | |
c4d67e2d AC |
10076 | if Nkind (S) /= N_Defining_Operator_Symbol then |
10077 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
ce5ba43a | 10078 | Check_SPARK_05_Restriction |
c4d67e2d AC |
10079 | ("overloading not allowed with entity#", S); |
10080 | end if; | |
8ed68165 | 10081 | |
82c80734 RD |
10082 | -- If S is a derived operation for an untagged type then by |
10083 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
10084 | -- operation was dispatching), so Check_Dispatching_Operation is not |
10085 | -- called in that case. | |
996ae0b0 | 10086 | |
c8ef728f | 10087 | if No (Derived_Type) |
996ae0b0 RK |
10088 | or else Is_Tagged_Type (Derived_Type) |
10089 | then | |
10090 | Check_Dispatching_Operation (S, Empty); | |
10091 | end if; | |
10092 | end if; | |
10093 | ||
82c80734 RD |
10094 | -- If this is a user-defined equality operator that is not a derived |
10095 | -- subprogram, create the corresponding inequality. If the operation is | |
10096 | -- dispatching, the expansion is done elsewhere, and we do not create | |
10097 | -- an explicit inequality operation. | |
996ae0b0 RK |
10098 | |
10099 | <<Check_Inequality>> | |
10100 | if Chars (S) = Name_Op_Eq | |
10101 | and then Etype (S) = Standard_Boolean | |
10102 | and then Present (Parent (S)) | |
10103 | and then not Is_Dispatching_Operation (S) | |
10104 | then | |
10105 | Make_Inequality_Operator (S); | |
b2834fbd | 10106 | Check_Untagged_Equality (S); |
996ae0b0 | 10107 | end if; |
996ae0b0 RK |
10108 | end New_Overloaded_Entity; |
10109 | ||
10110 | --------------------- | |
10111 | -- Process_Formals -- | |
10112 | --------------------- | |
10113 | ||
10114 | procedure Process_Formals | |
07fc65c4 | 10115 | (T : List_Id; |
996ae0b0 RK |
10116 | Related_Nod : Node_Id) |
10117 | is | |
10118 | Param_Spec : Node_Id; | |
10119 | Formal : Entity_Id; | |
10120 | Formal_Type : Entity_Id; | |
10121 | Default : Node_Id; | |
10122 | Ptype : Entity_Id; | |
10123 | ||
800621e0 RD |
10124 | Num_Out_Params : Nat := 0; |
10125 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 10126 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 10127 | |
7b56a91b | 10128 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
950d217a AC |
10129 | -- Determine whether an access type designates a type coming from a |
10130 | -- limited view. | |
10131 | ||
07fc65c4 | 10132 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
10133 | -- Check whether the default has a class-wide type. After analysis the |
10134 | -- default has the type of the formal, so we must also check explicitly | |
10135 | -- for an access attribute. | |
07fc65c4 | 10136 | |
7b56a91b AC |
10137 | ---------------------------------- |
10138 | -- Designates_From_Limited_With -- | |
10139 | ---------------------------------- | |
950d217a | 10140 | |
7b56a91b | 10141 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
950d217a AC |
10142 | Desig : Entity_Id := Typ; |
10143 | ||
10144 | begin | |
10145 | if Is_Access_Type (Desig) then | |
10146 | Desig := Directly_Designated_Type (Desig); | |
10147 | end if; | |
10148 | ||
10149 | if Is_Class_Wide_Type (Desig) then | |
10150 | Desig := Root_Type (Desig); | |
10151 | end if; | |
10152 | ||
10153 | return | |
7b56a91b AC |
10154 | Ekind (Desig) = E_Incomplete_Type |
10155 | and then From_Limited_With (Desig); | |
10156 | end Designates_From_Limited_With; | |
950d217a | 10157 | |
07fc65c4 GB |
10158 | --------------------------- |
10159 | -- Is_Class_Wide_Default -- | |
10160 | --------------------------- | |
10161 | ||
10162 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
10163 | begin | |
10164 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
10165 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
10166 | and then Attribute_Name (D) = Name_Access |
10167 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
10168 | end Is_Class_Wide_Default; |
10169 | ||
10170 | -- Start of processing for Process_Formals | |
10171 | ||
996ae0b0 RK |
10172 | begin |
10173 | -- In order to prevent premature use of the formals in the same formal | |
10174 | -- part, the Ekind is left undefined until all default expressions are | |
10175 | -- analyzed. The Ekind is established in a separate loop at the end. | |
10176 | ||
10177 | Param_Spec := First (T); | |
996ae0b0 | 10178 | while Present (Param_Spec) loop |
996ae0b0 | 10179 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 10180 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
10181 | Enter_Name (Formal); |
10182 | ||
10183 | -- Case of ordinary parameters | |
10184 | ||
10185 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
10186 | Find_Type (Parameter_Type (Param_Spec)); | |
10187 | Ptype := Parameter_Type (Param_Spec); | |
10188 | ||
10189 | if Ptype = Error then | |
10190 | goto Continue; | |
10191 | end if; | |
10192 | ||
10193 | Formal_Type := Entity (Ptype); | |
10194 | ||
ec4867fa ES |
10195 | if Is_Incomplete_Type (Formal_Type) |
10196 | or else | |
10197 | (Is_Class_Wide_Type (Formal_Type) | |
8fde064e | 10198 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
996ae0b0 | 10199 | then |
93bcda23 AC |
10200 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
10201 | -- primitive operations, as long as their completion is | |
10202 | -- in the same declarative part. If in the private part | |
10203 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
10204 | -- Check is done on package exit. For access to subprograms, |
10205 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 10206 | |
6eddd7b4 AC |
10207 | -- Ada 2012: tagged incomplete types are allowed as generic |
10208 | -- formal types. They do not introduce dependencies and the | |
10209 | -- corresponding generic subprogram does not have a delayed | |
5b6f12c7 AC |
10210 | -- freeze, because it does not need a freeze node. However, |
10211 | -- it is still the case that untagged incomplete types cannot | |
10212 | -- be Taft-amendment types and must be completed in private | |
10213 | -- part, so the subprogram must appear in the list of private | |
a0a10853 AC |
10214 | -- dependents of the type. If the type is class-wide, it is |
10215 | -- not a primitive, but the freezing of the subprogram must | |
10216 | -- also be delayed to force the creation of a freeze node. | |
5b6f12c7 AC |
10217 | |
10218 | if Is_Tagged_Type (Formal_Type) | |
b973629e | 10219 | or else (Ada_Version >= Ada_2012 |
1ebc2612 AC |
10220 | and then not From_Limited_With (Formal_Type) |
10221 | and then not Is_Generic_Type (Formal_Type)) | |
5b6f12c7 | 10222 | then |
93bcda23 | 10223 | if Ekind (Scope (Current_Scope)) = E_Package |
6eddd7b4 | 10224 | and then not Is_Generic_Type (Formal_Type) |
93bcda23 | 10225 | then |
cec29135 ES |
10226 | if not Nkind_In |
10227 | (Parent (T), N_Access_Function_Definition, | |
10228 | N_Access_Procedure_Definition) | |
10229 | then | |
a0a10853 AC |
10230 | if not Is_Class_Wide_Type (Formal_Type) then |
10231 | Append_Elmt (Current_Scope, | |
10232 | Private_Dependents (Base_Type (Formal_Type))); | |
10233 | end if; | |
4637729f AC |
10234 | |
10235 | -- Freezing is delayed to ensure that Register_Prim | |
10236 | -- will get called for this operation, which is needed | |
10237 | -- in cases where static dispatch tables aren't built. | |
10238 | -- (Note that the same is done for controlling access | |
10239 | -- parameter cases in function Access_Definition.) | |
10240 | ||
13fa2acb AC |
10241 | if not Is_Thunk (Current_Scope) then |
10242 | Set_Has_Delayed_Freeze (Current_Scope); | |
10243 | end if; | |
cec29135 | 10244 | end if; |
93bcda23 | 10245 | end if; |
fbf5a39b | 10246 | |
0a36105d JM |
10247 | -- Special handling of Value_Type for CIL case |
10248 | ||
10249 | elsif Is_Value_Type (Formal_Type) then | |
10250 | null; | |
10251 | ||
800621e0 RD |
10252 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
10253 | N_Access_Procedure_Definition) | |
996ae0b0 | 10254 | then |
dd386db0 AC |
10255 | -- AI05-0151: Tagged incomplete types are allowed in all |
10256 | -- formal parts. Untagged incomplete types are not allowed | |
b973629e AC |
10257 | -- in bodies. Limited views of either kind are not allowed |
10258 | -- if there is no place at which the non-limited view can | |
10259 | -- become available. | |
a18e3d62 | 10260 | |
1ebc2612 AC |
10261 | -- Incomplete formal untagged types are not allowed in |
10262 | -- subprogram bodies (but are legal in their declarations). | |
10263 | ||
10264 | if Is_Generic_Type (Formal_Type) | |
10265 | and then not Is_Tagged_Type (Formal_Type) | |
10266 | and then Nkind (Parent (Related_Nod)) = N_Subprogram_Body | |
10267 | then | |
10268 | Error_Msg_N | |
10269 | ("invalid use of formal incomplete type", Param_Spec); | |
dd386db0 | 10270 | |
1ebc2612 | 10271 | elsif Ada_Version >= Ada_2012 then |
b973629e AC |
10272 | if Is_Tagged_Type (Formal_Type) |
10273 | and then (not From_Limited_With (Formal_Type) | |
10274 | or else not In_Package_Body) | |
10275 | then | |
dd386db0 AC |
10276 | null; |
10277 | ||
0f1a6a0b | 10278 | elsif Nkind_In (Parent (Parent (T)), N_Accept_Statement, |
b973629e | 10279 | N_Accept_Alternative, |
0f1a6a0b AC |
10280 | N_Entry_Body, |
10281 | N_Subprogram_Body) | |
dd386db0 AC |
10282 | then |
10283 | Error_Msg_NE | |
10284 | ("invalid use of untagged incomplete type&", | |
0f1a6a0b | 10285 | Ptype, Formal_Type); |
dd386db0 AC |
10286 | end if; |
10287 | ||
10288 | else | |
10289 | Error_Msg_NE | |
10290 | ("invalid use of incomplete type&", | |
0f1a6a0b | 10291 | Param_Spec, Formal_Type); |
dd386db0 AC |
10292 | |
10293 | -- Further checks on the legality of incomplete types | |
10294 | -- in formal parts are delayed until the freeze point | |
10295 | -- of the enclosing subprogram or access to subprogram. | |
10296 | end if; | |
996ae0b0 RK |
10297 | end if; |
10298 | ||
10299 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
10300 | Error_Msg_NE |
10301 | ("premature use of&", | |
10302 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
10303 | end if; |
10304 | ||
fecbd779 AC |
10305 | -- Ada 2012 (AI-142): Handle aliased parameters |
10306 | ||
10307 | if Ada_Version >= Ada_2012 | |
10308 | and then Aliased_Present (Param_Spec) | |
10309 | then | |
10310 | Set_Is_Aliased (Formal); | |
10311 | end if; | |
10312 | ||
0ab80019 | 10313 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 10314 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
10315 | -- formal in the enclosing scope. Finally, replace the parameter |
10316 | -- type of the formal with the internal subtype. | |
7324bf49 | 10317 | |
0791fbe9 | 10318 | if Ada_Version >= Ada_2005 |
41251c60 | 10319 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 10320 | then |
ec4867fa | 10321 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 10322 | Error_Msg_N |
0a36105d JM |
10323 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
10324 | ||
ec4867fa ES |
10325 | else |
10326 | if Can_Never_Be_Null (Formal_Type) | |
10327 | and then Comes_From_Source (Related_Nod) | |
10328 | then | |
ed2233dc | 10329 | Error_Msg_NE |
0a36105d | 10330 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 10331 | Param_Spec, Formal_Type); |
ec4867fa | 10332 | end if; |
41251c60 | 10333 | |
ec4867fa ES |
10334 | Formal_Type := |
10335 | Create_Null_Excluding_Itype | |
10336 | (T => Formal_Type, | |
10337 | Related_Nod => Related_Nod, | |
10338 | Scope_Id => Scope (Current_Scope)); | |
0a36105d | 10339 | |
fcf848c4 AC |
10340 | -- If the designated type of the itype is an itype that is |
10341 | -- not frozen yet, we set the Has_Delayed_Freeze attribute | |
10342 | -- on the access subtype, to prevent order-of-elaboration | |
10343 | -- issues in the backend. | |
0a36105d JM |
10344 | |
10345 | -- Example: | |
10346 | -- type T is access procedure; | |
10347 | -- procedure Op (O : not null T); | |
10348 | ||
fcf848c4 AC |
10349 | if Is_Itype (Directly_Designated_Type (Formal_Type)) |
10350 | and then | |
10351 | not Is_Frozen (Directly_Designated_Type (Formal_Type)) | |
10352 | then | |
0a36105d JM |
10353 | Set_Has_Delayed_Freeze (Formal_Type); |
10354 | end if; | |
ec4867fa | 10355 | end if; |
7324bf49 AC |
10356 | end if; |
10357 | ||
996ae0b0 RK |
10358 | -- An access formal type |
10359 | ||
10360 | else | |
10361 | Formal_Type := | |
10362 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 10363 | |
f937473f RD |
10364 | -- No need to continue if we already notified errors |
10365 | ||
10366 | if not Present (Formal_Type) then | |
10367 | return; | |
10368 | end if; | |
10369 | ||
0ab80019 | 10370 | -- Ada 2005 (AI-254) |
7324bf49 | 10371 | |
af4b9434 AC |
10372 | declare |
10373 | AD : constant Node_Id := | |
10374 | Access_To_Subprogram_Definition | |
10375 | (Parameter_Type (Param_Spec)); | |
10376 | begin | |
10377 | if Present (AD) and then Protected_Present (AD) then | |
10378 | Formal_Type := | |
10379 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 10380 | (Param_Spec); |
af4b9434 AC |
10381 | end if; |
10382 | end; | |
996ae0b0 RK |
10383 | end if; |
10384 | ||
10385 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 10386 | |
fecbd779 AC |
10387 | -- Deal with default expression if present |
10388 | ||
fbf5a39b | 10389 | Default := Expression (Param_Spec); |
996ae0b0 RK |
10390 | |
10391 | if Present (Default) then | |
ce5ba43a | 10392 | Check_SPARK_05_Restriction |
fe5d3068 | 10393 | ("default expression is not allowed", Default); |
38171f43 | 10394 | |
996ae0b0 | 10395 | if Out_Present (Param_Spec) then |
ed2233dc | 10396 | Error_Msg_N |
996ae0b0 RK |
10397 | ("default initialization only allowed for IN parameters", |
10398 | Param_Spec); | |
10399 | end if; | |
10400 | ||
10401 | -- Do the special preanalysis of the expression (see section on | |
10402 | -- "Handling of Default Expressions" in the spec of package Sem). | |
10403 | ||
21d27997 | 10404 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 10405 | |
f29b857f ES |
10406 | -- An access to constant cannot be the default for |
10407 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
10408 | |
10409 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
10410 | and then not Is_Access_Constant (Formal_Type) | |
10411 | and then Is_Access_Type (Etype (Default)) | |
10412 | and then Is_Access_Constant (Etype (Default)) | |
10413 | then | |
f29b857f | 10414 | Error_Msg_N |
84c0a895 AC |
10415 | ("formal that is access to variable cannot be initialized " |
10416 | & "with an access-to-constant expression", Default); | |
2eb160f2 ST |
10417 | end if; |
10418 | ||
d8db0bca JM |
10419 | -- Check that the designated type of an access parameter's default |
10420 | -- is not a class-wide type unless the parameter's designated type | |
10421 | -- is also class-wide. | |
996ae0b0 RK |
10422 | |
10423 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
7b56a91b | 10424 | and then not Designates_From_Limited_With (Formal_Type) |
07fc65c4 | 10425 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
10426 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
10427 | then | |
07fc65c4 GB |
10428 | Error_Msg_N |
10429 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 10430 | end if; |
4755cce9 JM |
10431 | |
10432 | -- Check incorrect use of dynamically tagged expressions | |
10433 | ||
10434 | if Is_Tagged_Type (Formal_Type) then | |
10435 | Check_Dynamically_Tagged_Expression | |
10436 | (Expr => Default, | |
10437 | Typ => Formal_Type, | |
10438 | Related_Nod => Default); | |
10439 | end if; | |
996ae0b0 RK |
10440 | end if; |
10441 | ||
41251c60 JM |
10442 | -- Ada 2005 (AI-231): Static checks |
10443 | ||
0791fbe9 | 10444 | if Ada_Version >= Ada_2005 |
41251c60 JM |
10445 | and then Is_Access_Type (Etype (Formal)) |
10446 | and then Can_Never_Be_Null (Etype (Formal)) | |
10447 | then | |
10448 | Null_Exclusion_Static_Checks (Param_Spec); | |
10449 | end if; | |
10450 | ||
f1bd0415 AC |
10451 | -- The following checks are relevant when SPARK_Mode is on as these |
10452 | -- are not standard Ada legality rules. | |
6c3c671e | 10453 | |
ea26c8e4 HK |
10454 | if SPARK_Mode = On then |
10455 | if Ekind_In (Scope (Formal), E_Function, E_Generic_Function) then | |
f1bd0415 | 10456 | |
ea26c8e4 HK |
10457 | -- A function cannot have a parameter of mode IN OUT or OUT |
10458 | -- (SPARK RM 6.1). | |
f1bd0415 | 10459 | |
ea26c8e4 HK |
10460 | if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then |
10461 | Error_Msg_N | |
10462 | ("function cannot have parameter of mode `OUT` or " | |
10463 | & "`IN OUT`", Formal); | |
f1bd0415 | 10464 | |
d780e54f AC |
10465 | -- A function cannot have an effectively volatile formal |
10466 | -- parameter (SPARK RM 7.1.3(10)). | |
ea26c8e4 | 10467 | |
d780e54f | 10468 | elsif Is_Effectively_Volatile (Formal) then |
ea26c8e4 HK |
10469 | Error_Msg_N |
10470 | ("function cannot have a volatile formal parameter", | |
10471 | Formal); | |
10472 | end if; | |
10473 | ||
d780e54f AC |
10474 | -- A procedure cannot have an effectively volatile formal |
10475 | -- parameter of mode IN because it behaves as a constant | |
10476 | -- (SPARK RM 7.1.3(6)). | |
ea26c8e4 HK |
10477 | |
10478 | elsif Ekind (Scope (Formal)) = E_Procedure | |
10479 | and then Ekind (Formal) = E_In_Parameter | |
d780e54f | 10480 | and then Is_Effectively_Volatile (Formal) |
ea26c8e4 | 10481 | then |
f1bd0415 | 10482 | Error_Msg_N |
ea26c8e4 | 10483 | ("formal parameter of mode `IN` cannot be volatile", Formal); |
f1bd0415 | 10484 | end if; |
6c3c671e AC |
10485 | end if; |
10486 | ||
996ae0b0 RK |
10487 | <<Continue>> |
10488 | Next (Param_Spec); | |
10489 | end loop; | |
10490 | ||
82c80734 RD |
10491 | -- If this is the formal part of a function specification, analyze the |
10492 | -- subtype mark in the context where the formals are visible but not | |
10493 | -- yet usable, and may hide outer homographs. | |
10494 | ||
10495 | if Nkind (Related_Nod) = N_Function_Specification then | |
10496 | Analyze_Return_Type (Related_Nod); | |
10497 | end if; | |
10498 | ||
996ae0b0 RK |
10499 | -- Now set the kind (mode) of each formal |
10500 | ||
10501 | Param_Spec := First (T); | |
996ae0b0 RK |
10502 | while Present (Param_Spec) loop |
10503 | Formal := Defining_Identifier (Param_Spec); | |
10504 | Set_Formal_Mode (Formal); | |
10505 | ||
10506 | if Ekind (Formal) = E_In_Parameter then | |
10507 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
10508 | ||
10509 | if Present (Expression (Param_Spec)) then | |
10510 | Default := Expression (Param_Spec); | |
10511 | ||
10512 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
10513 | if Nkind (Parameter_Type (Param_Spec)) /= |
10514 | N_Access_Definition | |
996ae0b0 RK |
10515 | then |
10516 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 10517 | else |
5ebfaacf AC |
10518 | Formal_Type := |
10519 | Access_Definition | |
10520 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
10521 | end if; |
10522 | ||
10523 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
10524 | end if; | |
2820d220 | 10525 | end if; |
800621e0 RD |
10526 | |
10527 | elsif Ekind (Formal) = E_Out_Parameter then | |
10528 | Num_Out_Params := Num_Out_Params + 1; | |
10529 | ||
10530 | if Num_Out_Params = 1 then | |
10531 | First_Out_Param := Formal; | |
10532 | end if; | |
10533 | ||
10534 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
10535 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
10536 | end if; |
10537 | ||
4172a8e3 AC |
10538 | -- Skip remaining processing if formal type was in error |
10539 | ||
10540 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
10541 | goto Next_Parameter; | |
10542 | end if; | |
10543 | ||
fecbd779 AC |
10544 | -- Force call by reference if aliased |
10545 | ||
10546 | if Is_Aliased (Formal) then | |
10547 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf AC |
10548 | |
10549 | -- Warn if user asked this to be passed by copy | |
10550 | ||
10551 | if Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10552 | Error_Msg_N | |
b785e0b8 | 10553 | ("cannot pass aliased parameter & by copy??", Formal); |
5ebfaacf AC |
10554 | end if; |
10555 | ||
10556 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy | |
10557 | ||
10558 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10559 | Set_Mechanism (Formal, By_Copy); | |
10560 | ||
10561 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Reference then | |
10562 | Set_Mechanism (Formal, By_Reference); | |
fecbd779 AC |
10563 | end if; |
10564 | ||
4172a8e3 | 10565 | <<Next_Parameter>> |
996ae0b0 RK |
10566 | Next (Param_Spec); |
10567 | end loop; | |
800621e0 RD |
10568 | |
10569 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
10570 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
10571 | end if; | |
996ae0b0 RK |
10572 | end Process_Formals; |
10573 | ||
fbf5a39b AC |
10574 | ---------------------------- |
10575 | -- Reference_Body_Formals -- | |
10576 | ---------------------------- | |
10577 | ||
10578 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
10579 | Fs : Entity_Id; | |
10580 | Fb : Entity_Id; | |
10581 | ||
10582 | begin | |
10583 | if Error_Posted (Spec) then | |
10584 | return; | |
10585 | end if; | |
10586 | ||
0a36105d JM |
10587 | -- Iterate over both lists. They may be of different lengths if the two |
10588 | -- specs are not conformant. | |
10589 | ||
fbf5a39b AC |
10590 | Fs := First_Formal (Spec); |
10591 | Fb := First_Formal (Bod); | |
0a36105d | 10592 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
10593 | Generate_Reference (Fs, Fb, 'b'); |
10594 | ||
10595 | if Style_Check then | |
10596 | Style.Check_Identifier (Fb, Fs); | |
10597 | end if; | |
10598 | ||
10599 | Set_Spec_Entity (Fb, Fs); | |
10600 | Set_Referenced (Fs, False); | |
10601 | Next_Formal (Fs); | |
10602 | Next_Formal (Fb); | |
10603 | end loop; | |
10604 | end Reference_Body_Formals; | |
10605 | ||
996ae0b0 RK |
10606 | ------------------------- |
10607 | -- Set_Actual_Subtypes -- | |
10608 | ------------------------- | |
10609 | ||
10610 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
84c0a895 AC |
10611 | Decl : Node_Id; |
10612 | Formal : Entity_Id; | |
10613 | T : Entity_Id; | |
10614 | First_Stmt : Node_Id := Empty; | |
10615 | AS_Needed : Boolean; | |
996ae0b0 RK |
10616 | |
10617 | begin | |
f3d57416 | 10618 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
10619 | -- actual subtypes (small optimization). |
10620 | ||
8fde064e | 10621 | if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
fbf5a39b AC |
10622 | return; |
10623 | end if; | |
10624 | ||
996ae0b0 RK |
10625 | Formal := First_Formal (Subp); |
10626 | while Present (Formal) loop | |
10627 | T := Etype (Formal); | |
10628 | ||
e895b435 | 10629 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
10630 | |
10631 | if Is_Constrained (T) then | |
10632 | AS_Needed := False; | |
10633 | ||
82c80734 | 10634 | -- If we have unknown discriminants, then we do not need an actual |
a90bd866 | 10635 | -- subtype, or more accurately we cannot figure it out. Note that |
82c80734 | 10636 | -- all class-wide types have unknown discriminants. |
996ae0b0 RK |
10637 | |
10638 | elsif Has_Unknown_Discriminants (T) then | |
10639 | AS_Needed := False; | |
10640 | ||
82c80734 RD |
10641 | -- At this stage we have an unconstrained type that may need an |
10642 | -- actual subtype. For sure the actual subtype is needed if we have | |
10643 | -- an unconstrained array type. | |
996ae0b0 RK |
10644 | |
10645 | elsif Is_Array_Type (T) then | |
10646 | AS_Needed := True; | |
10647 | ||
d8db0bca JM |
10648 | -- The only other case needing an actual subtype is an unconstrained |
10649 | -- record type which is an IN parameter (we cannot generate actual | |
10650 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
10651 | -- change the discriminant values. However we exclude the case of | |
10652 | -- initialization procedures, since discriminants are handled very | |
10653 | -- specially in this context, see the section entitled "Handling of | |
10654 | -- Discriminants" in Einfo. | |
10655 | ||
10656 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
10657 | -- in front end layout mode for size/offset values), since in such | |
10658 | -- functions only discriminants are referenced, and not only are such | |
10659 | -- subtypes not needed, but they cannot always be generated, because | |
10660 | -- of order of elaboration issues. | |
996ae0b0 RK |
10661 | |
10662 | elsif Is_Record_Type (T) | |
10663 | and then Ekind (Formal) = E_In_Parameter | |
10664 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 10665 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
10666 | and then not Is_Discrim_SO_Function (Subp) |
10667 | then | |
10668 | AS_Needed := True; | |
10669 | ||
10670 | -- All other cases do not need an actual subtype | |
10671 | ||
10672 | else | |
10673 | AS_Needed := False; | |
10674 | end if; | |
10675 | ||
10676 | -- Generate actual subtypes for unconstrained arrays and | |
10677 | -- unconstrained discriminated records. | |
10678 | ||
10679 | if AS_Needed then | |
7324bf49 | 10680 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 10681 | |
57a8057a | 10682 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
10683 | -- variable that renames the corresponding entry of the |
10684 | -- parameter block, and it is this local variable that may | |
da94696d | 10685 | -- require an actual subtype. |
fbf5a39b | 10686 | |
4460a9bc | 10687 | if Expander_Active then |
fbf5a39b AC |
10688 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
10689 | else | |
10690 | Decl := Build_Actual_Subtype (T, Formal); | |
10691 | end if; | |
10692 | ||
996ae0b0 RK |
10693 | if Present (Handled_Statement_Sequence (N)) then |
10694 | First_Stmt := | |
10695 | First (Statements (Handled_Statement_Sequence (N))); | |
10696 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
10697 | Mark_Rewrite_Insertion (Decl); | |
10698 | else | |
82c80734 RD |
10699 | -- If the accept statement has no body, there will be no |
10700 | -- reference to the actuals, so no need to compute actual | |
10701 | -- subtypes. | |
996ae0b0 RK |
10702 | |
10703 | return; | |
10704 | end if; | |
10705 | ||
10706 | else | |
fbf5a39b | 10707 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
10708 | Prepend (Decl, Declarations (N)); |
10709 | Mark_Rewrite_Insertion (Decl); | |
10710 | end if; | |
10711 | ||
82c80734 RD |
10712 | -- The declaration uses the bounds of an existing object, and |
10713 | -- therefore needs no constraint checks. | |
2820d220 | 10714 | |
7324bf49 | 10715 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 10716 | |
996ae0b0 RK |
10717 | -- We need to freeze manually the generated type when it is |
10718 | -- inserted anywhere else than in a declarative part. | |
10719 | ||
10720 | if Present (First_Stmt) then | |
10721 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 10722 | Freeze_Entity (Defining_Identifier (Decl), N)); |
fcadacf7 ES |
10723 | |
10724 | -- Ditto if the type has a dynamic predicate, because the | |
10725 | -- generated function will mention the actual subtype. | |
10726 | ||
10727 | elsif Has_Dynamic_Predicate_Aspect (T) then | |
10728 | Insert_List_Before_And_Analyze (Decl, | |
10729 | Freeze_Entity (Defining_Identifier (Decl), N)); | |
996ae0b0 RK |
10730 | end if; |
10731 | ||
fbf5a39b | 10732 | if Nkind (N) = N_Accept_Statement |
4460a9bc | 10733 | and then Expander_Active |
fbf5a39b AC |
10734 | then |
10735 | Set_Actual_Subtype (Renamed_Object (Formal), | |
10736 | Defining_Identifier (Decl)); | |
10737 | else | |
10738 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
10739 | end if; | |
996ae0b0 RK |
10740 | end if; |
10741 | ||
10742 | Next_Formal (Formal); | |
10743 | end loop; | |
10744 | end Set_Actual_Subtypes; | |
10745 | ||
10746 | --------------------- | |
10747 | -- Set_Formal_Mode -- | |
10748 | --------------------- | |
10749 | ||
10750 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
10751 | Spec : constant Node_Id := Parent (Formal_Id); | |
10752 | ||
10753 | begin | |
10754 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
10755 | -- since we ensure that corresponding actuals are always valid at the | |
10756 | -- point of the call. | |
10757 | ||
10758 | if Out_Present (Spec) then | |
fc999c5d RD |
10759 | if Ekind_In (Scope (Formal_Id), E_Function, E_Generic_Function) then |
10760 | ||
b4ca2d2c | 10761 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
10762 | |
10763 | if Ada_Version >= Ada_2012 then | |
e6425869 AC |
10764 | |
10765 | -- Even in Ada 2012 operators can only have IN parameters | |
10766 | ||
10767 | if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then | |
10768 | Error_Msg_N ("operators can only have IN parameters", Spec); | |
10769 | end if; | |
10770 | ||
c56a9ba4 AC |
10771 | if In_Present (Spec) then |
10772 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10773 | else | |
10774 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
10775 | end if; | |
10776 | ||
fc999c5d RD |
10777 | Set_Has_Out_Or_In_Out_Parameter (Scope (Formal_Id), True); |
10778 | ||
b4ca2d2c AC |
10779 | -- But not in earlier versions of Ada |
10780 | ||
c56a9ba4 AC |
10781 | else |
10782 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
10783 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10784 | end if; | |
996ae0b0 RK |
10785 | |
10786 | elsif In_Present (Spec) then | |
10787 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10788 | ||
10789 | else | |
fbf5a39b AC |
10790 | Set_Ekind (Formal_Id, E_Out_Parameter); |
10791 | Set_Never_Set_In_Source (Formal_Id, True); | |
10792 | Set_Is_True_Constant (Formal_Id, False); | |
10793 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
10794 | end if; |
10795 | ||
10796 | else | |
10797 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10798 | end if; | |
10799 | ||
fbf5a39b | 10800 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
10801 | -- guarantees that access parameters are always non-null. We also set |
10802 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
10803 | |
10804 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 10805 | |
885c4871 | 10806 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 10807 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 10808 | |
0791fbe9 | 10809 | if Ada_Version < Ada_2005 |
2813bb6b | 10810 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
10811 | then |
10812 | Set_Is_Known_Non_Null (Formal_Id); | |
10813 | Set_Can_Never_Be_Null (Formal_Id); | |
10814 | end if; | |
2813bb6b | 10815 | |
41251c60 JM |
10816 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
10817 | ||
2813bb6b ES |
10818 | elsif Is_Access_Type (Etype (Formal_Id)) |
10819 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
10820 | then | |
2813bb6b | 10821 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
10822 | |
10823 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
10824 | -- access checks) for the case of an IN parameter, which cannot | |
10825 | -- be changed, or for an IN OUT parameter, which can be changed but | |
10826 | -- not to a null value. But for an OUT parameter, the initial value | |
10827 | -- passed in can be null, so we can't set this flag in that case. | |
10828 | ||
10829 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
10830 | Set_Can_Never_Be_Null (Formal_Id); | |
10831 | end if; | |
fbf5a39b AC |
10832 | end if; |
10833 | ||
996ae0b0 RK |
10834 | Set_Mechanism (Formal_Id, Default_Mechanism); |
10835 | Set_Formal_Validity (Formal_Id); | |
10836 | end Set_Formal_Mode; | |
10837 | ||
10838 | ------------------------- | |
10839 | -- Set_Formal_Validity -- | |
10840 | ------------------------- | |
10841 | ||
10842 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
10843 | begin | |
82c80734 RD |
10844 | -- If no validity checking, then we cannot assume anything about the |
10845 | -- validity of parameters, since we do not know there is any checking | |
10846 | -- of the validity on the call side. | |
996ae0b0 RK |
10847 | |
10848 | if not Validity_Checks_On then | |
10849 | return; | |
10850 | ||
fbf5a39b AC |
10851 | -- If validity checking for parameters is enabled, this means we are |
10852 | -- not supposed to make any assumptions about argument values. | |
10853 | ||
10854 | elsif Validity_Check_Parameters then | |
10855 | return; | |
10856 | ||
10857 | -- If we are checking in parameters, we will assume that the caller is | |
10858 | -- also checking parameters, so we can assume the parameter is valid. | |
10859 | ||
996ae0b0 RK |
10860 | elsif Ekind (Formal_Id) = E_In_Parameter |
10861 | and then Validity_Check_In_Params | |
10862 | then | |
10863 | Set_Is_Known_Valid (Formal_Id, True); | |
10864 | ||
fbf5a39b AC |
10865 | -- Similar treatment for IN OUT parameters |
10866 | ||
996ae0b0 RK |
10867 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
10868 | and then Validity_Check_In_Out_Params | |
10869 | then | |
10870 | Set_Is_Known_Valid (Formal_Id, True); | |
10871 | end if; | |
10872 | end Set_Formal_Validity; | |
10873 | ||
10874 | ------------------------ | |
10875 | -- Subtype_Conformant -- | |
10876 | ------------------------ | |
10877 | ||
ce2b6ba5 JM |
10878 | function Subtype_Conformant |
10879 | (New_Id : Entity_Id; | |
10880 | Old_Id : Entity_Id; | |
10881 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10882 | is | |
996ae0b0 | 10883 | Result : Boolean; |
996ae0b0 | 10884 | begin |
ce2b6ba5 JM |
10885 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
10886 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10887 | return Result; |
10888 | end Subtype_Conformant; | |
10889 | ||
10890 | --------------------- | |
10891 | -- Type_Conformant -- | |
10892 | --------------------- | |
10893 | ||
41251c60 JM |
10894 | function Type_Conformant |
10895 | (New_Id : Entity_Id; | |
10896 | Old_Id : Entity_Id; | |
10897 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10898 | is | |
996ae0b0 | 10899 | Result : Boolean; |
996ae0b0 | 10900 | begin |
c8ef728f | 10901 | May_Hide_Profile := False; |
41251c60 JM |
10902 | Check_Conformance |
10903 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
10904 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10905 | return Result; |
10906 | end Type_Conformant; | |
10907 | ||
10908 | ------------------------------- | |
10909 | -- Valid_Operator_Definition -- | |
10910 | ------------------------------- | |
10911 | ||
10912 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
10913 | N : Integer := 0; | |
10914 | F : Entity_Id; | |
10915 | Id : constant Name_Id := Chars (Designator); | |
10916 | N_OK : Boolean; | |
10917 | ||
10918 | begin | |
10919 | F := First_Formal (Designator); | |
996ae0b0 RK |
10920 | while Present (F) loop |
10921 | N := N + 1; | |
10922 | ||
10923 | if Present (Default_Value (F)) then | |
ed2233dc | 10924 | Error_Msg_N |
996ae0b0 RK |
10925 | ("default values not allowed for operator parameters", |
10926 | Parent (F)); | |
220d1fd9 AC |
10927 | |
10928 | -- For function instantiations that are operators, we must check | |
10929 | -- separately that the corresponding generic only has in-parameters. | |
84c0a895 AC |
10930 | -- For subprogram declarations this is done in Set_Formal_Mode. Such |
10931 | -- an error could not arise in earlier versions of the language. | |
220d1fd9 AC |
10932 | |
10933 | elsif Ekind (F) /= E_In_Parameter then | |
84c0a895 | 10934 | Error_Msg_N ("operators can only have IN parameters", F); |
996ae0b0 RK |
10935 | end if; |
10936 | ||
10937 | Next_Formal (F); | |
10938 | end loop; | |
10939 | ||
10940 | -- Verify that user-defined operators have proper number of arguments | |
10941 | -- First case of operators which can only be unary | |
10942 | ||
b69cd36a | 10943 | if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
996ae0b0 RK |
10944 | N_OK := (N = 1); |
10945 | ||
10946 | -- Case of operators which can be unary or binary | |
10947 | ||
b69cd36a | 10948 | elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
10949 | N_OK := (N in 1 .. 2); |
10950 | ||
10951 | -- All other operators can only be binary | |
10952 | ||
10953 | else | |
10954 | N_OK := (N = 2); | |
10955 | end if; | |
10956 | ||
10957 | if not N_OK then | |
10958 | Error_Msg_N | |
10959 | ("incorrect number of arguments for operator", Designator); | |
10960 | end if; | |
10961 | ||
10962 | if Id = Name_Op_Ne | |
10963 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
10964 | and then not Is_Intrinsic_Subprogram (Designator) | |
10965 | then | |
10966 | Error_Msg_N | |
84c0a895 | 10967 | ("explicit definition of inequality not allowed", Designator); |
996ae0b0 RK |
10968 | end if; |
10969 | end Valid_Operator_Definition; | |
10970 | ||
10971 | end Sem_Ch6; |