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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 | -- -- |
ed27b86b | 9 | -- Copyright (C) 1992-2018, 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 | ||
879ac954 AC |
26 | with Aspects; use Aspects; |
27 | with Atree; use Atree; | |
28 | with Checks; use Checks; | |
29 | with Contracts; use Contracts; | |
30 | with Debug; use Debug; | |
31 | with Einfo; use Einfo; | |
32 | with Elists; use Elists; | |
33 | with Errout; use Errout; | |
34 | with Expander; use Expander; | |
35 | with Exp_Ch6; use Exp_Ch6; | |
36 | with Exp_Ch7; use Exp_Ch7; | |
37 | with Exp_Ch9; use Exp_Ch9; | |
38 | with Exp_Dbug; use Exp_Dbug; | |
879ac954 AC |
39 | with Exp_Tss; use Exp_Tss; |
40 | with Exp_Util; use Exp_Util; | |
879ac954 AC |
41 | with Freeze; use Freeze; |
42 | with Ghost; use Ghost; | |
43 | with Inline; use Inline; | |
44 | with Itypes; use Itypes; | |
45 | with Lib.Xref; use Lib.Xref; | |
46 | with Layout; use Layout; | |
47 | with Namet; use Namet; | |
48 | with Lib; use Lib; | |
49 | with Nlists; use Nlists; | |
50 | with Nmake; use Nmake; | |
51 | with Opt; use Opt; | |
52 | with Output; use Output; | |
53 | with Restrict; use Restrict; | |
54 | with Rident; use Rident; | |
55 | with Rtsfind; use Rtsfind; | |
56 | with Sem; use Sem; | |
57 | with Sem_Aux; use Sem_Aux; | |
58 | with Sem_Cat; use Sem_Cat; | |
59 | with Sem_Ch3; use Sem_Ch3; | |
60 | with Sem_Ch4; use Sem_Ch4; | |
61 | with Sem_Ch5; use Sem_Ch5; | |
62 | with Sem_Ch8; use Sem_Ch8; | |
5e127570 | 63 | with Sem_Ch9; use Sem_Ch9; |
879ac954 AC |
64 | with Sem_Ch10; use Sem_Ch10; |
65 | with Sem_Ch12; use Sem_Ch12; | |
66 | with Sem_Ch13; use Sem_Ch13; | |
67 | with Sem_Dim; use Sem_Dim; | |
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; | |
996ae0b0 | 84 | with Style; |
879ac954 AC |
85 | with Stylesw; use Stylesw; |
86 | with Tbuild; use Tbuild; | |
87 | with Uintp; use Uintp; | |
88 | with Urealp; use Urealp; | |
89 | with Validsw; use Validsw; | |
996ae0b0 RK |
90 | |
91 | package body Sem_Ch6 is | |
92 | ||
c8ef728f | 93 | May_Hide_Profile : Boolean := False; |
ec4867fa ES |
94 | -- This flag is used to indicate that two formals in two subprograms being |
95 | -- checked for conformance differ only in that one is an access parameter | |
96 | -- while the other is of a general access type with the same designated | |
97 | -- type. In this case, if the rest of the signatures match, a call to | |
98 | -- either subprogram may be ambiguous, which is worth a warning. The flag | |
99 | -- is set in Compatible_Types, and the warning emitted in | |
100 | -- New_Overloaded_Entity. | |
c8ef728f | 101 | |
996ae0b0 RK |
102 | ----------------------- |
103 | -- Local Subprograms -- | |
104 | ----------------------- | |
105 | ||
c9d70ab1 AC |
106 | procedure Analyze_Function_Return (N : Node_Id); |
107 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement | |
108 | -- applies to a [generic] function. | |
109 | ||
110 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); | |
111 | -- Analyze a generic subprogram body. N is the body to be analyzed, and | |
112 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
113 | ||
4d8f3296 ES |
114 | procedure Analyze_Null_Procedure |
115 | (N : Node_Id; | |
116 | Is_Completion : out Boolean); | |
9d2a2071 | 117 | -- A null procedure can be a declaration or (Ada 2012) a completion |
4d8f3296 | 118 | |
5d37ba92 | 119 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 120 | -- Common processing for simple and extended return statements |
ec4867fa | 121 | |
82c80734 RD |
122 | procedure Analyze_Return_Type (N : Node_Id); |
123 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 124 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
125 | -- outer homographs. |
126 | ||
b1b543d2 | 127 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
128 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
129 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 130 | |
806f6d37 AC |
131 | function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
132 | -- Returns true if Subp can override a predefined operator. | |
133 | ||
996ae0b0 | 134 | procedure Check_Conformance |
41251c60 JM |
135 | (New_Id : Entity_Id; |
136 | Old_Id : Entity_Id; | |
137 | Ctype : Conformance_Type; | |
138 | Errmsg : Boolean; | |
139 | Conforms : out Boolean; | |
140 | Err_Loc : Node_Id := Empty; | |
141 | Get_Inst : Boolean := False; | |
142 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
143 | -- Given two entities, this procedure checks that the profiles associated |
144 | -- with these entities meet the conformance criterion given by the third | |
145 | -- parameter. If they conform, Conforms is set True and control returns | |
146 | -- to the caller. If they do not conform, Conforms is set to False, and | |
147 | -- in addition, if Errmsg is True on the call, proper messages are output | |
148 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
149 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
150 | -- error messages are placed on the appropriate part of the construct | |
151 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
152 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
153 | -- be called. | |
154 | ||
b420ba79 AC |
155 | procedure Check_Limited_Return |
156 | (N : Node_Id; | |
157 | Expr : Node_Id; | |
158 | R_Type : Entity_Id); | |
159 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning limited | |
160 | -- types. Used only for simple return statements. Expr is the expression | |
161 | -- returned. | |
162 | ||
996ae0b0 RK |
163 | procedure Check_Subprogram_Order (N : Node_Id); |
164 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
165 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
166 | ||
996ae0b0 RK |
167 | procedure Check_Returns |
168 | (HSS : Node_Id; | |
169 | Mode : Character; | |
c8ef728f ES |
170 | Err : out Boolean; |
171 | Proc : Entity_Id := Empty); | |
172 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 173 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
174 | -- handled statement sequence for the subprogram body. This procedure |
175 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
176 | -- used for functions) or do not have a return (Mode = 'P', used for | |
177 | -- No_Return procedures). The flag Err is set if there are any control | |
178 | -- paths not explicitly terminated by a return in the function case, and is | |
179 | -- True otherwise. Proc is the entity for the procedure case and is used | |
180 | -- in posting the warning message. | |
996ae0b0 | 181 | |
e5a58fac AC |
182 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
183 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
184 | -- must appear before the type is frozen, and have the same visibility as | |
185 | -- that of the type. This procedure checks that this rule is met, and | |
186 | -- otherwise emits an error on the subprogram declaration and a warning | |
b2834fbd AC |
187 | -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode, |
188 | -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier | |
189 | -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility | |
190 | -- is set, otherwise the call has no effect. | |
e5a58fac | 191 | |
996ae0b0 | 192 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
193 | -- This procedure makes S, a new overloaded entity, into the first visible |
194 | -- entity with that name. | |
996ae0b0 | 195 | |
a5b62485 AC |
196 | function Is_Non_Overriding_Operation |
197 | (Prev_E : Entity_Id; | |
198 | New_E : Entity_Id) return Boolean; | |
199 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
200 | -- overrides an inherited operation only if the corresponding operation | |
260359e3 AC |
201 | -- was overriding in the generic. This needs to be checked for primitive |
202 | -- operations of types derived (in the generic unit) from formal private | |
203 | -- or formal derived types. | |
a5b62485 | 204 | |
996ae0b0 RK |
205 | procedure Make_Inequality_Operator (S : Entity_Id); |
206 | -- Create the declaration for an inequality operator that is implicitly | |
207 | -- created by a user-defined equality operator that yields a boolean. | |
208 | ||
996ae0b0 RK |
209 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
210 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
211 | -- setting the proper validity status for this entity, which depends on |
212 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
213 | |
214 | --------------------------------------------- | |
215 | -- Analyze_Abstract_Subprogram_Declaration -- | |
216 | --------------------------------------------- | |
217 | ||
218 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
1af4455a HK |
219 | Scop : constant Entity_Id := Current_Scope; |
220 | Subp_Id : constant Entity_Id := | |
241ebe89 | 221 | Analyze_Subprogram_Specification (Specification (N)); |
996ae0b0 RK |
222 | |
223 | begin | |
ce5ba43a | 224 | Check_SPARK_05_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 225 | |
241ebe89 | 226 | Generate_Definition (Subp_Id); |
c9d70ab1 | 227 | |
90e491a7 PMR |
228 | -- Set the SPARK mode from the current context (may be overwritten later |
229 | -- with explicit pragma). | |
230 | ||
231 | Set_SPARK_Pragma (Subp_Id, SPARK_Mode_Pragma); | |
232 | Set_SPARK_Pragma_Inherited (Subp_Id); | |
233 | ||
234 | -- Preserve relevant elaboration-related attributes of the context which | |
235 | -- are no longer available or very expensive to recompute once analysis, | |
236 | -- resolution, and expansion are over. | |
237 | ||
238 | Mark_Elaboration_Attributes | |
162ed06f HK |
239 | (N_Id => Subp_Id, |
240 | Checks => True, | |
241 | Warnings => True); | |
90e491a7 | 242 | |
241ebe89 HK |
243 | Set_Is_Abstract_Subprogram (Subp_Id); |
244 | New_Overloaded_Entity (Subp_Id); | |
245 | Check_Delayed_Subprogram (Subp_Id); | |
996ae0b0 | 246 | |
241ebe89 | 247 | Set_Categorization_From_Scope (Subp_Id, Scop); |
996ae0b0 | 248 | |
241ebe89 HK |
249 | if Ekind (Scope (Subp_Id)) = E_Protected_Type then |
250 | Error_Msg_N ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
251 | |
252 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
253 | -- operation nor an operation that overrides an inherited subprogram or | |
254 | -- predefined operator, since this most likely indicates a mistake. | |
255 | ||
256 | elsif Warn_On_Redundant_Constructs | |
241ebe89 HK |
257 | and then not Is_Dispatching_Operation (Subp_Id) |
258 | and then not Present (Overridden_Operation (Subp_Id)) | |
259 | and then (not Is_Operator_Symbol_Name (Chars (Subp_Id)) | |
260 | or else Scop /= Scope (Etype (First_Formal (Subp_Id)))) | |
5d37ba92 ES |
261 | then |
262 | Error_Msg_N | |
dbfeb4fa | 263 | ("abstract subprogram is not dispatching or overriding?r?", N); |
996ae0b0 | 264 | end if; |
fbf5a39b | 265 | |
241ebe89 HK |
266 | Generate_Reference_To_Formals (Subp_Id); |
267 | Check_Eliminated (Subp_Id); | |
eaba57fb RD |
268 | |
269 | if Has_Aspects (N) then | |
241ebe89 | 270 | Analyze_Aspect_Specifications (N, Subp_Id); |
eaba57fb | 271 | end if; |
996ae0b0 RK |
272 | end Analyze_Abstract_Subprogram_Declaration; |
273 | ||
b0186f71 AC |
274 | --------------------------------- |
275 | -- Analyze_Expression_Function -- | |
276 | --------------------------------- | |
277 | ||
278 | procedure Analyze_Expression_Function (N : Node_Id) is | |
8d1fe980 AC |
279 | Expr : constant Node_Id := Expression (N); |
280 | Loc : constant Source_Ptr := Sloc (N); | |
281 | LocX : constant Source_Ptr := Sloc (Expr); | |
282 | Spec : constant Node_Id := Specification (N); | |
d2d4b355 | 283 | |
ae5115dd AC |
284 | procedure Freeze_Expr_Types (Def_Id : Entity_Id); |
285 | -- N is an expression function that is a completion and Def_Id its | |
4ac62786 AC |
286 | -- defining entity. Freeze before N all the types referenced by the |
287 | -- expression of the function. | |
288 | ||
289 | ----------------------- | |
290 | -- Freeze_Expr_Types -- | |
291 | ----------------------- | |
292 | ||
ae5115dd | 293 | procedure Freeze_Expr_Types (Def_Id : Entity_Id) is |
4ac62786 AC |
294 | function Cloned_Expression return Node_Id; |
295 | -- Build a duplicate of the expression of the return statement that | |
296 | -- has no defining entities shared with the original expression. | |
297 | ||
298 | function Freeze_Type_Refs (Node : Node_Id) return Traverse_Result; | |
299 | -- Freeze all types referenced in the subtree rooted at Node | |
300 | ||
301 | ----------------------- | |
302 | -- Cloned_Expression -- | |
303 | ----------------------- | |
304 | ||
305 | function Cloned_Expression return Node_Id is | |
306 | function Clone_Id (Node : Node_Id) return Traverse_Result; | |
307 | -- Tree traversal routine that clones the defining identifier of | |
308 | -- iterator and loop parameter specification nodes. | |
309 | ||
8016e567 PT |
310 | -------------- |
311 | -- Clone_Id -- | |
312 | -------------- | |
4ac62786 AC |
313 | |
314 | function Clone_Id (Node : Node_Id) return Traverse_Result is | |
315 | begin | |
316 | if Nkind_In (Node, N_Iterator_Specification, | |
317 | N_Loop_Parameter_Specification) | |
318 | then | |
319 | Set_Defining_Identifier (Node, | |
320 | New_Copy (Defining_Identifier (Node))); | |
321 | end if; | |
322 | ||
323 | return OK; | |
324 | end Clone_Id; | |
325 | ||
326 | procedure Clone_Def_Ids is new Traverse_Proc (Clone_Id); | |
327 | ||
328 | -- Local variable | |
329 | ||
330 | Dup_Expr : constant Node_Id := New_Copy_Tree (Expr); | |
331 | ||
332 | -- Start of processing for Cloned_Expression | |
333 | ||
334 | begin | |
335 | -- We must duplicate the expression with semantic information to | |
336 | -- inherit the decoration of global entities in generic instances. | |
337 | -- Set the parent of the new node to be the parent of the original | |
338 | -- to get the proper context, which is needed for complete error | |
339 | -- reporting and for semantic analysis. | |
340 | ||
341 | Set_Parent (Dup_Expr, Parent (Expr)); | |
342 | ||
343 | -- Replace the defining identifier of iterators and loop param | |
344 | -- specifications by a clone to ensure that the cloned expression | |
345 | -- and the original expression don't have shared identifiers; | |
346 | -- otherwise, as part of the preanalysis of the expression, these | |
347 | -- shared identifiers may be left decorated with itypes which | |
348 | -- will not be available in the tree passed to the backend. | |
349 | ||
350 | Clone_Def_Ids (Dup_Expr); | |
351 | ||
352 | return Dup_Expr; | |
353 | end Cloned_Expression; | |
354 | ||
355 | ---------------------- | |
356 | -- Freeze_Type_Refs -- | |
357 | ---------------------- | |
358 | ||
359 | function Freeze_Type_Refs (Node : Node_Id) return Traverse_Result is | |
4ac62786 AC |
360 | procedure Check_And_Freeze_Type (Typ : Entity_Id); |
361 | -- Check that Typ is fully declared and freeze it if so | |
362 | ||
363 | --------------------------- | |
364 | -- Check_And_Freeze_Type -- | |
365 | --------------------------- | |
366 | ||
367 | procedure Check_And_Freeze_Type (Typ : Entity_Id) is | |
368 | begin | |
fc47ef60 PMR |
369 | -- Skip Itypes created by the preanalysis, and itypes whose |
370 | -- scope is another type (i.e. component subtypes that depend | |
371 | -- on a discriminant), | |
4ac62786 AC |
372 | |
373 | if Is_Itype (Typ) | |
76fc4a85 | 374 | and then (Scope_Within_Or_Same (Scope (Typ), Def_Id) |
fc47ef60 | 375 | or else Is_Type (Scope (Typ))) |
4ac62786 AC |
376 | then |
377 | return; | |
378 | end if; | |
379 | ||
380 | -- This provides a better error message than generating | |
381 | -- primitives whose compilation fails much later. Refine | |
382 | -- the error message if possible. | |
383 | ||
384 | Check_Fully_Declared (Typ, Node); | |
385 | ||
386 | if Error_Posted (Node) then | |
387 | if Has_Private_Component (Typ) | |
388 | and then not Is_Private_Type (Typ) | |
389 | then | |
72a26637 | 390 | Error_Msg_NE ("\type& has private component", Node, Typ); |
4ac62786 AC |
391 | end if; |
392 | ||
393 | else | |
394 | Freeze_Before (N, Typ); | |
395 | end if; | |
396 | end Check_And_Freeze_Type; | |
397 | ||
398 | -- Start of processing for Freeze_Type_Refs | |
399 | ||
400 | begin | |
401 | -- Check that a type referenced by an entity can be frozen | |
402 | ||
403 | if Is_Entity_Name (Node) and then Present (Entity (Node)) then | |
404 | Check_And_Freeze_Type (Etype (Entity (Node))); | |
405 | ||
406 | -- Check that the enclosing record type can be frozen | |
407 | ||
408 | if Ekind_In (Entity (Node), E_Component, E_Discriminant) then | |
409 | Check_And_Freeze_Type (Scope (Entity (Node))); | |
410 | end if; | |
411 | ||
412 | -- Freezing an access type does not freeze the designated type, | |
413 | -- but freezing conversions between access to interfaces requires | |
414 | -- that the interface types themselves be frozen, so that dispatch | |
415 | -- table entities are properly created. | |
416 | ||
417 | -- Unclear whether a more general rule is needed ??? | |
418 | ||
419 | elsif Nkind (Node) = N_Type_Conversion | |
420 | and then Is_Access_Type (Etype (Node)) | |
421 | and then Is_Interface (Designated_Type (Etype (Node))) | |
422 | then | |
423 | Check_And_Freeze_Type (Designated_Type (Etype (Node))); | |
424 | end if; | |
425 | ||
52c5090a ES |
426 | -- An implicit dereference freezes the designated type. In the |
427 | -- case of a dispatching call whose controlling argument is an | |
428 | -- access type, the dereference is not made explicit, so we must | |
429 | -- check for such a call and freeze the designated type. | |
430 | ||
431 | if Nkind (Node) in N_Has_Etype | |
432 | and then Present (Etype (Node)) | |
433 | and then Is_Access_Type (Etype (Node)) | |
434 | and then Nkind (Parent (Node)) = N_Function_Call | |
435 | and then Node = Controlling_Argument (Parent (Node)) | |
436 | then | |
437 | Check_And_Freeze_Type (Designated_Type (Etype (Node))); | |
438 | end if; | |
439 | ||
4ac62786 AC |
440 | -- No point in posting several errors on the same expression |
441 | ||
442 | if Serious_Errors_Detected > 0 then | |
443 | return Abandon; | |
444 | else | |
445 | return OK; | |
446 | end if; | |
447 | end Freeze_Type_Refs; | |
448 | ||
449 | procedure Freeze_References is new Traverse_Proc (Freeze_Type_Refs); | |
450 | ||
451 | -- Local variables | |
452 | ||
ae5115dd AC |
453 | Saved_First_Entity : constant Entity_Id := First_Entity (Def_Id); |
454 | Saved_Last_Entity : constant Entity_Id := Last_Entity (Def_Id); | |
4ac62786 AC |
455 | Dup_Expr : constant Node_Id := Cloned_Expression; |
456 | ||
457 | -- Start of processing for Freeze_Expr_Types | |
458 | ||
459 | begin | |
460 | -- Preanalyze a duplicate of the expression to have available the | |
461 | -- minimum decoration needed to locate referenced unfrozen types | |
8f8f531f | 462 | -- without adding any decoration to the function expression. |
4ac62786 | 463 | |
ae5115dd AC |
464 | Push_Scope (Def_Id); |
465 | Install_Formals (Def_Id); | |
4ac62786 | 466 | |
ae5115dd | 467 | Preanalyze_Spec_Expression (Dup_Expr, Etype (Def_Id)); |
4ac62786 AC |
468 | End_Scope; |
469 | ||
ae5115dd | 470 | -- Restore certain attributes of Def_Id since the preanalysis may |
4ac62786 AC |
471 | -- have introduced itypes to this scope, thus modifying attributes |
472 | -- First_Entity and Last_Entity. | |
473 | ||
ae5115dd AC |
474 | Set_First_Entity (Def_Id, Saved_First_Entity); |
475 | Set_Last_Entity (Def_Id, Saved_Last_Entity); | |
4ac62786 | 476 | |
ae5115dd AC |
477 | if Present (Last_Entity (Def_Id)) then |
478 | Set_Next_Entity (Last_Entity (Def_Id), Empty); | |
4ac62786 AC |
479 | end if; |
480 | ||
481 | -- Freeze all types referenced in the expression | |
482 | ||
483 | Freeze_References (Dup_Expr); | |
484 | end Freeze_Expr_Types; | |
485 | ||
486 | -- Local variables | |
487 | ||
ec225529 | 488 | Asp : Node_Id; |
ec225529 AC |
489 | New_Body : Node_Id; |
490 | New_Spec : Node_Id; | |
491 | Orig_N : Node_Id; | |
492 | Ret : Node_Id; | |
b0186f71 | 493 | |
3f89eb7f JS |
494 | Def_Id : Entity_Id := Empty; |
495 | Prev : Entity_Id; | |
b0186f71 | 496 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
497 | -- declaration is completed. Def_Id is needed to analyze the spec. |
498 | ||
4ac62786 AC |
499 | -- Start of processing for Analyze_Expression_Function |
500 | ||
b0186f71 AC |
501 | begin |
502 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 503 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
504 | -- function into an equivalent subprogram body, and analyze it. |
505 | ||
506 | -- Expression functions are inlined unconditionally. The back-end will | |
507 | -- determine whether this is possible. | |
508 | ||
509 | Inline_Processing_Required := True; | |
b727a82b | 510 | |
8d1fe980 AC |
511 | -- Create a specification for the generated body. This must be done |
512 | -- prior to the analysis of the initial declaration. | |
b727a82b | 513 | |
8d1fe980 AC |
514 | New_Spec := Copy_Subprogram_Spec (Spec); |
515 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
d2d4b355 AC |
516 | |
517 | -- If there are previous overloadable entities with the same name, | |
518 | -- check whether any of them is completed by the expression function. | |
b04d926e | 519 | -- In a generic context a formal subprogram has no completion. |
d2d4b355 | 520 | |
4b6f99f5 RD |
521 | if Present (Prev) |
522 | and then Is_Overloadable (Prev) | |
b04d926e AC |
523 | and then not Is_Formal_Subprogram (Prev) |
524 | then | |
51597c23 AC |
525 | Def_Id := Analyze_Subprogram_Specification (Spec); |
526 | Prev := Find_Corresponding_Spec (N); | |
35e7063a AC |
527 | |
528 | -- The previous entity may be an expression function as well, in | |
529 | -- which case the redeclaration is illegal. | |
530 | ||
531 | if Present (Prev) | |
5073ad7a AC |
532 | and then Nkind (Original_Node (Unit_Declaration_Node (Prev))) = |
533 | N_Expression_Function | |
35e7063a | 534 | then |
bc5e261c ES |
535 | Error_Msg_Sloc := Sloc (Prev); |
536 | Error_Msg_N ("& conflicts with declaration#", Def_Id); | |
35e7063a AC |
537 | return; |
538 | end if; | |
d2d4b355 | 539 | end if; |
b0186f71 | 540 | |
4ac62786 | 541 | Ret := Make_Simple_Return_Statement (LocX, Expr); |
b913199e | 542 | |
b0186f71 AC |
543 | New_Body := |
544 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 545 | Specification => New_Spec, |
b0186f71 AC |
546 | Declarations => Empty_List, |
547 | Handled_Statement_Sequence => | |
548 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 549 | Statements => New_List (Ret))); |
549cc9c2 | 550 | Set_Was_Expression_Function (New_Body); |
b0186f71 | 551 | |
e7f23f06 AC |
552 | -- If the expression completes a generic subprogram, we must create a |
553 | -- separate node for the body, because at instantiation the original | |
554 | -- node of the generic copy must be a generic subprogram body, and | |
555 | -- cannot be a expression function. Otherwise we just rewrite the | |
556 | -- expression with the non-generic body. | |
557 | ||
6d7e5c54 | 558 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
e7f23f06 | 559 | Insert_After (N, New_Body); |
6d7e5c54 | 560 | |
e7f23f06 AC |
561 | -- Propagate any aspects or pragmas that apply to the expression |
562 | -- function to the proper body when the expression function acts | |
563 | -- as a completion. | |
564 | ||
565 | if Has_Aspects (N) then | |
566 | Move_Aspects (N, To => New_Body); | |
567 | end if; | |
568 | ||
569 | Relocate_Pragmas_To_Body (New_Body); | |
b0186f71 | 570 | |
b0186f71 | 571 | Rewrite (N, Make_Null_Statement (Loc)); |
d2d4b355 | 572 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
573 | Analyze (N); |
574 | Analyze (New_Body); | |
d2b10647 | 575 | Set_Is_Inlined (Prev); |
b0186f71 | 576 | |
e5c4e2bc | 577 | -- If the expression function is a completion, the previous declaration |
88fa9a24 | 578 | -- must come from source. We know already that it appears in the current |
e5c4e2bc AC |
579 | -- scope. The entity itself may be internally created if within a body |
580 | -- to be inlined. | |
581 | ||
4b6f99f5 | 582 | elsif Present (Prev) |
4ac62786 | 583 | and then Is_Overloadable (Prev) |
b04d926e | 584 | and then not Is_Formal_Subprogram (Prev) |
4ac62786 | 585 | and then Comes_From_Source (Parent (Prev)) |
b04d926e | 586 | then |
d2d4b355 | 587 | Set_Has_Completion (Prev, False); |
88fa9a24 | 588 | Set_Is_Inlined (Prev); |
76264f60 | 589 | |
4ac62786 AC |
590 | -- AI12-0103: Expression functions that are a completion freeze their |
591 | -- expression but don't freeze anything else (unlike regular bodies). | |
1b31321b | 592 | |
c6d2191a | 593 | -- Note that we cannot defer this freezing to the analysis of the |
1b31321b AC |
594 | -- expression itself, because a freeze node might appear in a nested |
595 | -- scope, leading to an elaboration order issue in gigi. | |
20ad0586 | 596 | -- As elsewhere, we do not emit freeze nodes within a generic unit. |
c6d2191a | 597 | |
20ad0586 PMR |
598 | if not Inside_A_Generic then |
599 | Freeze_Expr_Types (Def_Id); | |
600 | end if; | |
1b31321b | 601 | |
76264f60 AC |
602 | -- For navigation purposes, indicate that the function is a body |
603 | ||
604 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 605 | Rewrite (N, New_Body); |
e7f23f06 | 606 | |
ec225529 | 607 | -- Remove any existing aspects from the original node because the act |
60aa5228 | 608 | -- of rewriting causes the list to be shared between the two nodes. |
c0cdbd39 | 609 | |
ec225529 AC |
610 | Orig_N := Original_Node (N); |
611 | Remove_Aspects (Orig_N); | |
c0cdbd39 | 612 | |
aaa0a838 | 613 | -- Propagate any pragmas that apply to expression function to the |
e7f23f06 AC |
614 | -- proper body when the expression function acts as a completion. |
615 | -- Aspects are automatically transfered because of node rewriting. | |
616 | ||
617 | Relocate_Pragmas_To_Body (N); | |
d2b10647 ES |
618 | Analyze (N); |
619 | ||
60aa5228 AC |
620 | -- Once the aspects of the generated body have been analyzed, create |
621 | -- a copy for ASIS purposes and associate it with the original node. | |
ec225529 AC |
622 | |
623 | if Has_Aspects (N) then | |
624 | Set_Aspect_Specifications (Orig_N, | |
625 | New_Copy_List_Tree (Aspect_Specifications (N))); | |
626 | end if; | |
627 | ||
6d7e5c54 AC |
628 | -- Prev is the previous entity with the same name, but it is can |
629 | -- be an unrelated spec that is not completed by the expression | |
630 | -- function. In that case the relevant entity is the one in the body. | |
631 | -- Not clear that the backend can inline it in this case ??? | |
632 | ||
633 | if Has_Completion (Prev) then | |
31af8899 AC |
634 | |
635 | -- The formals of the expression function are body formals, | |
636 | -- and do not appear in the ali file, which will only contain | |
637 | -- references to the formals of the original subprogram spec. | |
638 | ||
639 | declare | |
640 | F1 : Entity_Id; | |
641 | F2 : Entity_Id; | |
642 | ||
643 | begin | |
644 | F1 := First_Formal (Def_Id); | |
645 | F2 := First_Formal (Prev); | |
646 | ||
647 | while Present (F1) loop | |
648 | Set_Spec_Entity (F1, F2); | |
649 | Next_Formal (F1); | |
650 | Next_Formal (F2); | |
651 | end loop; | |
652 | end; | |
653 | ||
6d7e5c54 AC |
654 | else |
655 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
656 | end if; | |
657 | ||
0b5b2bbc | 658 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 659 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
660 | |
661 | else | |
a52e6d7e AC |
662 | -- An expression function that is not a completion is not a |
663 | -- subprogram declaration, and thus cannot appear in a protected | |
664 | -- definition. | |
665 | ||
666 | if Nkind (Parent (N)) = N_Protected_Definition then | |
667 | Error_Msg_N | |
668 | ("an expression function is not a legal protected operation", N); | |
669 | end if; | |
670 | ||
b8e6830b | 671 | Rewrite (N, Make_Subprogram_Declaration (Loc, Specification => Spec)); |
c0cdbd39 | 672 | |
ec225529 | 673 | -- Remove any existing aspects from the original node because the act |
60aa5228 | 674 | -- of rewriting causes the list to be shared between the two nodes. |
c0cdbd39 | 675 | |
ec225529 AC |
676 | Orig_N := Original_Node (N); |
677 | Remove_Aspects (Orig_N); | |
c0cdbd39 | 678 | |
b0186f71 | 679 | Analyze (N); |
ec225529 | 680 | |
60aa5228 AC |
681 | -- Once the aspects of the generated spec have been analyzed, create |
682 | -- a copy for ASIS purposes and associate it with the original node. | |
ec225529 AC |
683 | |
684 | if Has_Aspects (N) then | |
685 | Set_Aspect_Specifications (Orig_N, | |
686 | New_Copy_List_Tree (Aspect_Specifications (N))); | |
687 | end if; | |
b04d926e | 688 | |
d29f68cf AC |
689 | -- If aspect SPARK_Mode was specified on the body, it needs to be |
690 | -- repeated both on the generated spec and the body. | |
691 | ||
692 | Asp := Find_Aspect (Defining_Unit_Name (Spec), Aspect_SPARK_Mode); | |
693 | ||
694 | if Present (Asp) then | |
695 | Asp := New_Copy_Tree (Asp); | |
696 | Set_Analyzed (Asp, False); | |
697 | Set_Aspect_Specifications (New_Body, New_List (Asp)); | |
698 | end if; | |
699 | ||
ec225529 | 700 | Def_Id := Defining_Entity (N); |
f63adaa7 AC |
701 | Set_Is_Inlined (Def_Id); |
702 | ||
703 | -- Establish the linkages between the spec and the body. These are | |
704 | -- used when the expression function acts as the prefix of attribute | |
705 | -- 'Access in order to freeze the original expression which has been | |
706 | -- moved to the generated body. | |
707 | ||
708 | Set_Corresponding_Body (N, Defining_Entity (New_Body)); | |
709 | Set_Corresponding_Spec (New_Body, Def_Id); | |
ec225529 | 710 | |
e699b76e AC |
711 | -- Within a generic pre-analyze the original expression for name |
712 | -- capture. The body is also generated but plays no role in | |
713 | -- this because it is not part of the original source. | |
b04d926e AC |
714 | |
715 | if Inside_A_Generic then | |
b420ba79 AC |
716 | Set_Has_Completion (Def_Id); |
717 | Push_Scope (Def_Id); | |
718 | Install_Formals (Def_Id); | |
719 | Preanalyze_Spec_Expression (Expr, Etype (Def_Id)); | |
720 | End_Scope; | |
b04d926e AC |
721 | end if; |
722 | ||
6d7e5c54 AC |
723 | -- To prevent premature freeze action, insert the new body at the end |
724 | -- of the current declarations, or at the end of the package spec. | |
b913199e | 725 | -- However, resolve usage names now, to prevent spurious visibility |
ad4e3362 ES |
726 | -- on later entities. Note that the function can now be called in |
727 | -- the current declarative part, which will appear to be prior to | |
728 | -- the presence of the body in the code. There are nevertheless no | |
729 | -- order of elaboration issues because all name resolution has taken | |
730 | -- place at the point of declaration. | |
6d7e5c54 AC |
731 | |
732 | declare | |
e876c43a | 733 | Decls : List_Id := List_Containing (N); |
b420ba79 | 734 | Expr : constant Node_Id := Expression (Ret); |
e876c43a | 735 | Par : constant Node_Id := Parent (Decls); |
b420ba79 | 736 | Typ : constant Entity_Id := Etype (Def_Id); |
6d7e5c54 AC |
737 | |
738 | begin | |
fce54763 AC |
739 | -- If this is a wrapper created for in an instance for a formal |
740 | -- subprogram, insert body after declaration, to be analyzed when | |
741 | -- the enclosing instance is analyzed. | |
742 | ||
743 | if GNATprove_Mode | |
f63adaa7 | 744 | and then Is_Generic_Actual_Subprogram (Def_Id) |
6d7e5c54 | 745 | then |
fce54763 AC |
746 | Insert_After (N, New_Body); |
747 | ||
748 | else | |
749 | if Nkind (Par) = N_Package_Specification | |
750 | and then Decls = Visible_Declarations (Par) | |
751 | and then Present (Private_Declarations (Par)) | |
752 | and then not Is_Empty_List (Private_Declarations (Par)) | |
753 | then | |
754 | Decls := Private_Declarations (Par); | |
755 | end if; | |
6d7e5c54 | 756 | |
fce54763 | 757 | Insert_After (Last (Decls), New_Body); |
3a8e3f63 | 758 | |
a83d0680 | 759 | -- Preanalyze the expression if not already done above |
845f06e2 | 760 | |
a83d0680 | 761 | if not Inside_A_Generic then |
f63adaa7 AC |
762 | Push_Scope (Def_Id); |
763 | Install_Formals (Def_Id); | |
b420ba79 AC |
764 | Preanalyze_Spec_Expression (Expr, Typ); |
765 | Check_Limited_Return (Original_Node (N), Expr, Typ); | |
f63adaa7 | 766 | End_Scope; |
b420ba79 | 767 | end if; |
fce54763 | 768 | end if; |
6d7e5c54 | 769 | end; |
b0186f71 | 770 | end if; |
0b5b2bbc | 771 | |
7f9fcce8 BD |
772 | -- Check incorrect use of dynamically tagged expression. This doesn't |
773 | -- fall out automatically when analyzing the generated function body, | |
774 | -- because Check_Dynamically_Tagged_Expression deliberately ignores | |
775 | -- nodes that don't come from source. | |
776 | ||
777 | if Present (Def_Id) | |
778 | and then Nkind (Def_Id) in N_Has_Etype | |
779 | and then Is_Tagged_Type (Etype (Def_Id)) | |
780 | then | |
781 | Check_Dynamically_Tagged_Expression | |
d7cc5f0e PMR |
782 | (Expr => Expr, |
783 | Typ => Etype (Def_Id), | |
7f9fcce8 BD |
784 | Related_Nod => Original_Node (N)); |
785 | end if; | |
786 | ||
3f89eb7f JS |
787 | -- We must enforce checks for unreferenced formals in our newly |
788 | -- generated function, so we propagate the referenced flag from the | |
789 | -- original spec to the new spec as well as setting Comes_From_Source. | |
0b5b2bbc | 790 | |
3f89eb7f JS |
791 | if Present (Parameter_Specifications (New_Spec)) then |
792 | declare | |
793 | Form_New_Def : Entity_Id; | |
794 | Form_New_Spec : Entity_Id; | |
795 | Form_Old_Def : Entity_Id; | |
796 | Form_Old_Spec : Entity_Id; | |
797 | begin | |
798 | ||
799 | Form_New_Spec := First (Parameter_Specifications (New_Spec)); | |
800 | Form_Old_Spec := First (Parameter_Specifications (Spec)); | |
801 | ||
802 | while Present (Form_New_Spec) and then Present (Form_Old_Spec) loop | |
803 | Form_New_Def := Defining_Identifier (Form_New_Spec); | |
804 | Form_Old_Def := Defining_Identifier (Form_Old_Spec); | |
805 | ||
806 | Set_Comes_From_Source (Form_New_Def, True); | |
807 | ||
808 | -- Because of the usefulness of unreferenced controlling | |
809 | -- formals we exempt them from unreferenced warnings by marking | |
810 | -- them as always referenced. | |
811 | ||
812 | Set_Referenced | |
813 | (Form_Old_Def, | |
814 | (Is_Formal (Form_Old_Def) | |
815 | and then Is_Controlling_Formal (Form_Old_Def)) | |
816 | or else Referenced (Form_Old_Def)); | |
817 | -- or else Is_Dispatching_Operation | |
818 | -- (Corresponding_Spec (New_Body))); | |
819 | ||
820 | Next (Form_New_Spec); | |
821 | Next (Form_Old_Spec); | |
822 | end loop; | |
823 | end; | |
824 | end if; | |
b0186f71 AC |
825 | end Analyze_Expression_Function; |
826 | ||
ec4867fa ES |
827 | ---------------------------------------- |
828 | -- Analyze_Extended_Return_Statement -- | |
829 | ---------------------------------------- | |
830 | ||
831 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
832 | begin | |
c86cf714 | 833 | Check_Compiler_Unit ("extended return statement", N); |
5d37ba92 | 834 | Analyze_Return_Statement (N); |
ec4867fa ES |
835 | end Analyze_Extended_Return_Statement; |
836 | ||
996ae0b0 RK |
837 | ---------------------------- |
838 | -- Analyze_Function_Call -- | |
839 | ---------------------------- | |
840 | ||
841 | procedure Analyze_Function_Call (N : Node_Id) is | |
a7e68e7f HK |
842 | Actuals : constant List_Id := Parameter_Associations (N); |
843 | Func_Nam : constant Node_Id := Name (N); | |
844 | Actual : Node_Id; | |
845 | ||
996ae0b0 | 846 | begin |
a7e68e7f | 847 | Analyze (Func_Nam); |
996ae0b0 | 848 | |
3e7302c3 AC |
849 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
850 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
851 | -- has been analyzed and we just return. | |
82c80734 | 852 | |
a7e68e7f HK |
853 | if Nkind (Func_Nam) = N_Selected_Component |
854 | and then Name (N) /= Func_Nam | |
82c80734 RD |
855 | and then Is_Rewrite_Substitution (N) |
856 | and then Present (Etype (N)) | |
857 | then | |
858 | return; | |
859 | end if; | |
860 | ||
996ae0b0 RK |
861 | -- If error analyzing name, then set Any_Type as result type and return |
862 | ||
a7e68e7f | 863 | if Etype (Func_Nam) = Any_Type then |
996ae0b0 RK |
864 | Set_Etype (N, Any_Type); |
865 | return; | |
866 | end if; | |
867 | ||
868 | -- Otherwise analyze the parameters | |
869 | ||
e24329cd YM |
870 | if Present (Actuals) then |
871 | Actual := First (Actuals); | |
996ae0b0 RK |
872 | while Present (Actual) loop |
873 | Analyze (Actual); | |
874 | Check_Parameterless_Call (Actual); | |
875 | Next (Actual); | |
876 | end loop; | |
877 | end if; | |
878 | ||
879 | Analyze_Call (N); | |
996ae0b0 RK |
880 | end Analyze_Function_Call; |
881 | ||
ec4867fa ES |
882 | ----------------------------- |
883 | -- Analyze_Function_Return -- | |
884 | ----------------------------- | |
885 | ||
886 | procedure Analyze_Function_Return (N : Node_Id) is | |
a7e68e7f HK |
887 | Loc : constant Source_Ptr := Sloc (N); |
888 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
889 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
ec4867fa | 890 | |
5d37ba92 | 891 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
892 | -- Function result subtype |
893 | ||
ed11bbfe | 894 | procedure Check_Aggregate_Accessibility (Aggr : Node_Id); |
448a1eb3 | 895 | -- Apply legality rule of 6.5 (5.8) to the access discriminants of an |
43184ab7 | 896 | -- aggregate in a return statement. |
ed11bbfe | 897 | |
ec4867fa ES |
898 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); |
899 | -- Check that the return_subtype_indication properly matches the result | |
900 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
901 | ||
ed11bbfe AC |
902 | ----------------------------------- |
903 | -- Check_Aggregate_Accessibility -- | |
904 | ----------------------------------- | |
905 | ||
906 | procedure Check_Aggregate_Accessibility (Aggr : Node_Id) is | |
996ce809 JS |
907 | Typ : constant Entity_Id := Etype (Aggr); |
908 | Assoc : Node_Id; | |
909 | Discr : Entity_Id; | |
910 | Expr : Node_Id; | |
911 | Obj : Node_Id; | |
ed11bbfe AC |
912 | |
913 | begin | |
43184ab7 | 914 | if Is_Record_Type (Typ) and then Has_Discriminants (Typ) then |
ed11bbfe AC |
915 | Discr := First_Discriminant (Typ); |
916 | Assoc := First (Component_Associations (Aggr)); | |
917 | while Present (Discr) loop | |
918 | if Ekind (Etype (Discr)) = E_Anonymous_Access_Type then | |
919 | Expr := Expression (Assoc); | |
996ce809 | 920 | |
ed11bbfe AC |
921 | if Nkind (Expr) = N_Attribute_Reference |
922 | and then Attribute_Name (Expr) /= Name_Unrestricted_Access | |
923 | then | |
924 | Obj := Prefix (Expr); | |
43184ab7 HK |
925 | while Nkind_In (Obj, N_Indexed_Component, |
926 | N_Selected_Component) | |
ed11bbfe AC |
927 | loop |
928 | Obj := Prefix (Obj); | |
929 | end loop; | |
930 | ||
996ce809 JS |
931 | -- Do not check aliased formals or function calls. A |
932 | -- run-time check may still be needed ??? | |
ed962eda | 933 | |
ed11bbfe | 934 | if Is_Entity_Name (Obj) |
996ce809 | 935 | and then Comes_From_Source (Obj) |
ed11bbfe | 936 | then |
996ce809 JS |
937 | if Is_Formal (Entity (Obj)) |
938 | and then Is_Aliased (Entity (Obj)) | |
939 | then | |
940 | null; | |
941 | ||
942 | elsif Object_Access_Level (Obj) > | |
943 | Scope_Depth (Scope (Scope_Id)) | |
944 | then | |
945 | Error_Msg_N | |
946 | ("access discriminant in return aggregate would " | |
947 | & "be a dangling reference", Obj); | |
948 | end if; | |
ed11bbfe AC |
949 | end if; |
950 | end if; | |
951 | end if; | |
952 | ||
953 | Next_Discriminant (Discr); | |
954 | end loop; | |
955 | end if; | |
956 | end Check_Aggregate_Accessibility; | |
957 | ||
ec4867fa ES |
958 | ------------------------------------- |
959 | -- Check_Return_Subtype_Indication -- | |
960 | ------------------------------------- | |
961 | ||
962 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
963 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
964 | ||
965 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
966 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
967 | |
968 | Subtype_Ind : constant Node_Id := | |
969 | Object_Definition (Original_Node (Obj_Decl)); | |
970 | ||
7f568bfa AC |
971 | procedure Error_No_Match (N : Node_Id); |
972 | -- Output error messages for case where types do not statically | |
973 | -- match. N is the location for the messages. | |
974 | ||
975 | -------------------- | |
976 | -- Error_No_Match -- | |
977 | -------------------- | |
978 | ||
979 | procedure Error_No_Match (N : Node_Id) is | |
980 | begin | |
981 | Error_Msg_N | |
982 | ("subtype must statically match function result subtype", N); | |
983 | ||
984 | if not Predicates_Match (R_Stm_Type, R_Type) then | |
985 | Error_Msg_Node_2 := R_Type; | |
986 | Error_Msg_NE | |
3ccedacc | 987 | ("\predicate of& does not match predicate of&", |
7f568bfa AC |
988 | N, R_Stm_Type); |
989 | end if; | |
990 | end Error_No_Match; | |
991 | ||
992 | -- Start of processing for Check_Return_Subtype_Indication | |
993 | ||
ec4867fa | 994 | begin |
7665e4bd | 995 | -- First, avoid cascaded errors |
ec4867fa ES |
996 | |
997 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
998 | return; | |
999 | end if; | |
1000 | ||
1001 | -- "return access T" case; check that the return statement also has | |
1002 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 1003 | -- if this is an access to subprogram the signatures must match. |
ec4867fa | 1004 | |
d1eb8a82 AC |
1005 | if Is_Anonymous_Access_Type (R_Type) then |
1006 | if Is_Anonymous_Access_Type (R_Stm_Type) then | |
1007 | if Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 1008 | then |
53cf4600 ES |
1009 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
1010 | Base_Type (Designated_Type (R_Type)) | |
1011 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
1012 | then | |
7f568bfa | 1013 | Error_No_Match (Subtype_Mark (Subtype_Ind)); |
53cf4600 ES |
1014 | end if; |
1015 | ||
1016 | else | |
d1eb8a82 AC |
1017 | -- For two anonymous access to subprogram types, the types |
1018 | -- themselves must be type conformant. | |
53cf4600 ES |
1019 | |
1020 | if not Conforming_Types | |
d1eb8a82 | 1021 | (R_Stm_Type, R_Type, Fully_Conformant) |
53cf4600 | 1022 | then |
7f568bfa | 1023 | Error_No_Match (Subtype_Ind); |
53cf4600 | 1024 | end if; |
ec4867fa | 1025 | end if; |
0a36105d | 1026 | |
ec4867fa ES |
1027 | else |
1028 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
1029 | end if; | |
1030 | ||
6cce2156 GD |
1031 | -- If the return object is of an anonymous access type, then report |
1032 | -- an error if the function's result type is not also anonymous. | |
1033 | ||
d1eb8a82 AC |
1034 | elsif Is_Anonymous_Access_Type (R_Stm_Type) then |
1035 | pragma Assert (not Is_Anonymous_Access_Type (R_Type)); | |
1036 | Error_Msg_N | |
1037 | ("anonymous access not allowed for function with named access " | |
1038 | & "result", Subtype_Ind); | |
6cce2156 | 1039 | |
81d93365 AC |
1040 | -- Subtype indication case: check that the return object's type is |
1041 | -- covered by the result type, and that the subtypes statically match | |
1042 | -- when the result subtype is constrained. Also handle record types | |
1043 | -- with unknown discriminants for which we have built the underlying | |
1044 | -- record view. Coverage is needed to allow specific-type return | |
1045 | -- objects when the result type is class-wide (see AI05-32). | |
1046 | ||
1047 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 1048 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
1049 | and then |
1050 | Covers | |
1051 | (Base_Type (R_Type), | |
1052 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
1053 | then |
1054 | -- A null exclusion may be present on the return type, on the | |
1055 | -- function specification, on the object declaration or on the | |
1056 | -- subtype itself. | |
ec4867fa | 1057 | |
21d27997 RD |
1058 | if Is_Access_Type (R_Type) |
1059 | and then | |
d1eb8a82 AC |
1060 | (Can_Never_Be_Null (R_Type) |
1061 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
1062 | Can_Never_Be_Null (R_Stm_Type) | |
21d27997 | 1063 | then |
7f568bfa | 1064 | Error_No_Match (Subtype_Ind); |
21d27997 RD |
1065 | end if; |
1066 | ||
105b5e65 | 1067 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa | 1068 | |
d1eb8a82 | 1069 | if Is_Constrained (R_Type) or else Is_Access_Type (R_Type) then |
ec4867fa | 1070 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
7f568bfa | 1071 | Error_No_Match (Subtype_Ind); |
ec4867fa ES |
1072 | end if; |
1073 | end if; | |
1074 | ||
a8b346d2 RD |
1075 | -- All remaining cases are illegal |
1076 | ||
1077 | -- Note: previous versions of this subprogram allowed the return | |
1078 | -- value to be the ancestor of the return type if the return type | |
1079 | -- was a null extension. This was plainly incorrect. | |
ff7139c3 | 1080 | |
ec4867fa ES |
1081 | else |
1082 | Error_Msg_N | |
1083 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
1084 | end if; | |
1085 | end Check_Return_Subtype_Indication; | |
1086 | ||
1087 | --------------------- | |
1088 | -- Local Variables -- | |
1089 | --------------------- | |
1090 | ||
445e5888 | 1091 | Expr : Node_Id; |
dcd5fd67 | 1092 | Obj_Decl : Node_Id := Empty; |
ec4867fa ES |
1093 | |
1094 | -- Start of processing for Analyze_Function_Return | |
1095 | ||
1096 | begin | |
1097 | Set_Return_Present (Scope_Id); | |
1098 | ||
5d37ba92 | 1099 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 1100 | Expr := Expression (N); |
4ee646da | 1101 | |
e917aec2 RD |
1102 | -- Guard against a malformed expression. The parser may have tried to |
1103 | -- recover but the node is not analyzable. | |
4ee646da AC |
1104 | |
1105 | if Nkind (Expr) = N_Error then | |
1106 | Set_Etype (Expr, Any_Type); | |
1107 | Expander_Mode_Save_And_Set (False); | |
1108 | return; | |
1109 | ||
1110 | else | |
0180fd26 AC |
1111 | -- The resolution of a controlled [extension] aggregate associated |
1112 | -- with a return statement creates a temporary which needs to be | |
1113 | -- finalized on function exit. Wrap the return statement inside a | |
1114 | -- block so that the finalization machinery can detect this case. | |
1115 | -- This early expansion is done only when the return statement is | |
1116 | -- not part of a handled sequence of statements. | |
1117 | ||
1118 | if Nkind_In (Expr, N_Aggregate, | |
1119 | N_Extension_Aggregate) | |
1120 | and then Needs_Finalization (R_Type) | |
1121 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
1122 | then | |
1123 | Rewrite (N, | |
1124 | Make_Block_Statement (Loc, | |
1125 | Handled_Statement_Sequence => | |
1126 | Make_Handled_Sequence_Of_Statements (Loc, | |
1127 | Statements => New_List (Relocate_Node (N))))); | |
1128 | ||
1129 | Analyze (N); | |
1130 | return; | |
1131 | end if; | |
1132 | ||
4b963531 AC |
1133 | Analyze (Expr); |
1134 | ||
1135 | -- Ada 2005 (AI-251): If the type of the returned object is | |
1136 | -- an access to an interface type then we add an implicit type | |
1137 | -- conversion to force the displacement of the "this" pointer to | |
1138 | -- reference the secondary dispatch table. We cannot delay the | |
1139 | -- generation of this implicit conversion until the expansion | |
1140 | -- because in this case the type resolution changes the decoration | |
1141 | -- of the expression node to match R_Type; by contrast, if the | |
1142 | -- returned object is a class-wide interface type then it is too | |
1143 | -- early to generate here the implicit conversion since the return | |
1144 | -- statement may be rewritten by the expander into an extended | |
1145 | -- return statement whose expansion takes care of adding the | |
1146 | -- implicit type conversion to displace the pointer to the object. | |
1147 | ||
1148 | if Expander_Active | |
1149 | and then Serious_Errors_Detected = 0 | |
1150 | and then Is_Access_Type (R_Type) | |
ed323421 | 1151 | and then not Nkind_In (Expr, N_Null, N_Raise_Expression) |
4b963531 AC |
1152 | and then Is_Interface (Designated_Type (R_Type)) |
1153 | and then Is_Progenitor (Designated_Type (R_Type), | |
1154 | Designated_Type (Etype (Expr))) | |
1155 | then | |
73e5aa55 | 1156 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); |
4b963531 AC |
1157 | Analyze (Expr); |
1158 | end if; | |
1159 | ||
1160 | Resolve (Expr, R_Type); | |
b420ba79 | 1161 | Check_Limited_Return (N, Expr, R_Type); |
ed11bbfe AC |
1162 | |
1163 | if Present (Expr) and then Nkind (Expr) = N_Aggregate then | |
1164 | Check_Aggregate_Accessibility (Expr); | |
1165 | end if; | |
4ee646da | 1166 | end if; |
ec4867fa | 1167 | |
ad05f2e9 | 1168 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 1169 | |
fe5d3068 | 1170 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
1171 | and then |
1172 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 1173 | or else Present (Next (N))) |
607d0635 | 1174 | then |
ce5ba43a | 1175 | Check_SPARK_05_Restriction |
fe5d3068 | 1176 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
1177 | end if; |
1178 | ||
ec4867fa | 1179 | else |
ce5ba43a | 1180 | Check_SPARK_05_Restriction ("extended RETURN is not allowed", N); |
445e5888 | 1181 | Obj_Decl := Last (Return_Object_Declarations (N)); |
607d0635 | 1182 | |
ec4867fa ES |
1183 | -- Analyze parts specific to extended_return_statement: |
1184 | ||
1185 | declare | |
de6cad7c | 1186 | Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
b9daa96e | 1187 | HSS : constant Node_Id := Handled_Statement_Sequence (N); |
ec4867fa ES |
1188 | |
1189 | begin | |
1190 | Expr := Expression (Obj_Decl); | |
1191 | ||
1192 | -- Note: The check for OK_For_Limited_Init will happen in | |
1193 | -- Analyze_Object_Declaration; we treat it as a normal | |
1194 | -- object declaration. | |
1195 | ||
cd1c668b | 1196 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
1197 | Analyze (Obj_Decl); |
1198 | ||
ec4867fa ES |
1199 | Check_Return_Subtype_Indication (Obj_Decl); |
1200 | ||
1201 | if Present (HSS) then | |
1202 | Analyze (HSS); | |
1203 | ||
1204 | if Present (Exception_Handlers (HSS)) then | |
1205 | ||
1206 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
1207 | -- Probably by creating an actual N_Block_Statement. | |
1208 | -- Probably in Expand. | |
1209 | ||
1210 | null; | |
1211 | end if; | |
1212 | end if; | |
1213 | ||
9337aa0a AC |
1214 | -- Mark the return object as referenced, since the return is an |
1215 | -- implicit reference of the object. | |
1216 | ||
1217 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
1218 | ||
ec4867fa | 1219 | Check_References (Stm_Entity); |
de6cad7c AC |
1220 | |
1221 | -- Check RM 6.5 (5.9/3) | |
1222 | ||
1223 | if Has_Aliased then | |
1224 | if Ada_Version < Ada_2012 then | |
dbfeb4fa RD |
1225 | |
1226 | -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? | |
1227 | -- Can it really happen (extended return???) | |
1228 | ||
1229 | Error_Msg_N | |
b785e0b8 AC |
1230 | ("aliased only allowed for limited return objects " |
1231 | & "in Ada 2012??", N); | |
de6cad7c | 1232 | |
51245e2d | 1233 | elsif not Is_Limited_View (R_Type) then |
3ccedacc AC |
1234 | Error_Msg_N |
1235 | ("aliased only allowed for limited return objects", N); | |
de6cad7c AC |
1236 | end if; |
1237 | end if; | |
ec4867fa ES |
1238 | end; |
1239 | end if; | |
1240 | ||
21d27997 | 1241 | -- Case of Expr present |
5d37ba92 | 1242 | |
dcd5fd67 | 1243 | if Present (Expr) then |
21d27997 | 1244 | |
dcd5fd67 PMR |
1245 | -- Defend against previous errors |
1246 | ||
1247 | if Nkind (Expr) = N_Empty | |
1248 | or else No (Etype (Expr)) | |
1249 | then | |
1250 | return; | |
1251 | end if; | |
21d27997 | 1252 | |
5d37ba92 ES |
1253 | -- Apply constraint check. Note that this is done before the implicit |
1254 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 1255 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
1256 | -- with null-excluding expressions found in return statements. |
1257 | ||
1258 | Apply_Constraint_Check (Expr, R_Type); | |
1259 | ||
1260 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
1261 | -- type, apply an implicit conversion of the expression to that type | |
1262 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 1263 | |
0791fbe9 | 1264 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
1265 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
1266 | then | |
1267 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
1268 | Analyze_And_Resolve (Expr, R_Type); | |
b6b5cca8 AC |
1269 | |
1270 | -- If this is a local anonymous access to subprogram, the | |
1271 | -- accessibility check can be applied statically. The return is | |
1272 | -- illegal if the access type of the return expression is declared | |
1273 | -- inside of the subprogram (except if it is the subtype indication | |
1274 | -- of an extended return statement). | |
1275 | ||
9fe696a3 | 1276 | elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then |
b6b5cca8 AC |
1277 | if not Comes_From_Source (Current_Scope) |
1278 | or else Ekind (Current_Scope) = E_Return_Statement | |
1279 | then | |
1280 | null; | |
1281 | ||
1282 | elsif | |
1283 | Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) | |
1284 | then | |
1285 | Error_Msg_N ("cannot return local access to subprogram", N); | |
1286 | end if; | |
1ebc2612 AC |
1287 | |
1288 | -- The expression cannot be of a formal incomplete type | |
1289 | ||
1290 | elsif Ekind (Etype (Expr)) = E_Incomplete_Type | |
1291 | and then Is_Generic_Type (Etype (Expr)) | |
1292 | then | |
1293 | Error_Msg_N | |
1294 | ("cannot return expression of a formal incomplete type", N); | |
ec4867fa ES |
1295 | end if; |
1296 | ||
21d27997 RD |
1297 | -- If the result type is class-wide, then check that the return |
1298 | -- expression's type is not declared at a deeper level than the | |
1299 | -- function (RM05-6.5(5.6/2)). | |
1300 | ||
0791fbe9 | 1301 | if Ada_Version >= Ada_2005 |
21d27997 RD |
1302 | and then Is_Class_Wide_Type (R_Type) |
1303 | then | |
1304 | if Type_Access_Level (Etype (Expr)) > | |
1305 | Subprogram_Access_Level (Scope_Id) | |
1306 | then | |
1307 | Error_Msg_N | |
3ccedacc AC |
1308 | ("level of return expression type is deeper than " |
1309 | & "class-wide function!", Expr); | |
21d27997 RD |
1310 | end if; |
1311 | end if; | |
1312 | ||
4755cce9 JM |
1313 | -- Check incorrect use of dynamically tagged expression |
1314 | ||
1315 | if Is_Tagged_Type (R_Type) then | |
1316 | Check_Dynamically_Tagged_Expression | |
1317 | (Expr => Expr, | |
1318 | Typ => R_Type, | |
1319 | Related_Nod => N); | |
ec4867fa ES |
1320 | end if; |
1321 | ||
ec4867fa ES |
1322 | -- ??? A real run-time accessibility check is needed in cases |
1323 | -- involving dereferences of access parameters. For now we just | |
1324 | -- check the static cases. | |
1325 | ||
0791fbe9 | 1326 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
51245e2d | 1327 | and then Is_Limited_View (Etype (Scope_Id)) |
ec4867fa ES |
1328 | and then Object_Access_Level (Expr) > |
1329 | Subprogram_Access_Level (Scope_Id) | |
1330 | then | |
9694c039 AC |
1331 | -- Suppress the message in a generic, where the rewriting |
1332 | -- is irrelevant. | |
1333 | ||
1334 | if Inside_A_Generic then | |
1335 | null; | |
1336 | ||
1337 | else | |
1338 | Rewrite (N, | |
1339 | Make_Raise_Program_Error (Loc, | |
1340 | Reason => PE_Accessibility_Check_Failed)); | |
1341 | Analyze (N); | |
1342 | ||
43417b90 | 1343 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
1344 | Error_Msg_N ("cannot return a local value by reference<<", N); |
1345 | Error_Msg_NE ("\& [<<", N, Standard_Program_Error); | |
9694c039 | 1346 | end if; |
ec4867fa | 1347 | end if; |
5d37ba92 ES |
1348 | |
1349 | if Known_Null (Expr) | |
1350 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
1351 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
1352 | then | |
1353 | Apply_Compile_Time_Constraint_Error | |
1354 | (N => Expr, | |
1355 | Msg => "(Ada 2005) null not allowed for " | |
dbfeb4fa | 1356 | & "null-excluding return??", |
5d37ba92 ES |
1357 | Reason => CE_Null_Not_Allowed); |
1358 | end if; | |
445e5888 AC |
1359 | |
1360 | -- RM 6.5 (5.4/3): accessibility checks also apply if the return object | |
1361 | -- has no initializing expression. | |
1362 | ||
1363 | elsif Ada_Version > Ada_2005 and then Is_Class_Wide_Type (R_Type) then | |
1364 | if Type_Access_Level (Etype (Defining_Identifier (Obj_Decl))) > | |
1365 | Subprogram_Access_Level (Scope_Id) | |
1366 | then | |
1367 | Error_Msg_N | |
1368 | ("level of return expression type is deeper than " | |
1369 | & "class-wide function!", Obj_Decl); | |
1370 | end if; | |
ec4867fa ES |
1371 | end if; |
1372 | end Analyze_Function_Return; | |
1373 | ||
996ae0b0 RK |
1374 | ------------------------------------- |
1375 | -- Analyze_Generic_Subprogram_Body -- | |
1376 | ------------------------------------- | |
1377 | ||
1378 | procedure Analyze_Generic_Subprogram_Body | |
1379 | (N : Node_Id; | |
1380 | Gen_Id : Entity_Id) | |
1381 | is | |
fbf5a39b | 1382 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 1383 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 1384 | Body_Id : Entity_Id; |
996ae0b0 | 1385 | New_N : Node_Id; |
fbf5a39b | 1386 | Spec : Node_Id; |
996ae0b0 RK |
1387 | |
1388 | begin | |
82c80734 RD |
1389 | -- Copy body and disable expansion while analyzing the generic For a |
1390 | -- stub, do not copy the stub (which would load the proper body), this | |
1391 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
1392 | |
1393 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
1394 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
1395 | Rewrite (N, New_N); | |
caf07df9 AC |
1396 | |
1397 | -- Once the contents of the generic copy and the template are | |
1398 | -- swapped, do the same for their respective aspect specifications. | |
1399 | ||
1400 | Exchange_Aspects (N, New_N); | |
1401 | ||
1402 | -- Collect all contract-related source pragmas found within the | |
1403 | -- template and attach them to the contract of the subprogram body. | |
1404 | -- This contract is used in the capture of global references within | |
1405 | -- annotations. | |
1406 | ||
1407 | Create_Generic_Contract (N); | |
1408 | ||
996ae0b0 RK |
1409 | Start_Generic; |
1410 | end if; | |
1411 | ||
1412 | Spec := Specification (N); | |
1413 | ||
1414 | -- Within the body of the generic, the subprogram is callable, and | |
1415 | -- behaves like the corresponding non-generic unit. | |
1416 | ||
fbf5a39b | 1417 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
1418 | |
1419 | if Kind = E_Generic_Procedure | |
1420 | and then Nkind (Spec) /= N_Procedure_Specification | |
1421 | then | |
fbf5a39b | 1422 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
1423 | return; |
1424 | ||
1425 | elsif Kind = E_Generic_Function | |
1426 | and then Nkind (Spec) /= N_Function_Specification | |
1427 | then | |
fbf5a39b | 1428 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
1429 | return; |
1430 | end if; | |
1431 | ||
fbf5a39b | 1432 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
1433 | |
1434 | if Has_Completion (Gen_Id) | |
1435 | and then Nkind (Parent (N)) /= N_Subunit | |
1436 | then | |
1437 | Error_Msg_N ("duplicate generic body", N); | |
1438 | return; | |
1439 | else | |
1440 | Set_Has_Completion (Gen_Id); | |
1441 | end if; | |
1442 | ||
1443 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1444 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1445 | else | |
1446 | Set_Corresponding_Spec (N, Gen_Id); | |
1447 | end if; | |
1448 | ||
1449 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1450 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1451 | end if; | |
1452 | ||
1453 | -- Make generic parameters immediately visible in the body. They are | |
1454 | -- needed to process the formals declarations. Then make the formals | |
1455 | -- visible in a separate step. | |
1456 | ||
0a36105d | 1457 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1458 | |
1459 | declare | |
1460 | E : Entity_Id; | |
1461 | First_Ent : Entity_Id; | |
1462 | ||
1463 | begin | |
1464 | First_Ent := First_Entity (Gen_Id); | |
1465 | ||
1466 | E := First_Ent; | |
1467 | while Present (E) and then not Is_Formal (E) loop | |
1468 | Install_Entity (E); | |
1469 | Next_Entity (E); | |
1470 | end loop; | |
1471 | ||
1472 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1473 | ||
1474 | -- Now generic formals are visible, and the specification can be | |
1475 | -- analyzed, for subsequent conformance check. | |
1476 | ||
fbf5a39b | 1477 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1478 | |
fbf5a39b | 1479 | -- Make formal parameters visible |
996ae0b0 RK |
1480 | |
1481 | if Present (E) then | |
1482 | ||
fbf5a39b AC |
1483 | -- E is the first formal parameter, we loop through the formals |
1484 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1485 | |
1486 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1487 | while Present (E) loop |
1488 | Install_Entity (E); | |
1489 | Next_Formal (E); | |
1490 | end loop; | |
1491 | end if; | |
1492 | ||
e895b435 | 1493 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1494 | |
ec4867fa ES |
1495 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
1496 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
1497 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1498 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1499 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
c5cec2fe | 1500 | |
fbf5a39b AC |
1501 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1502 | ||
1503 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1504 | ||
e895b435 | 1505 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1506 | |
1507 | Set_Ekind (Gen_Id, Kind); | |
1508 | Set_Ekind (Body_Id, Kind); | |
1509 | ||
1510 | if Present (First_Ent) then | |
1511 | Set_First_Entity (Gen_Id, First_Ent); | |
1512 | end if; | |
1513 | ||
1514 | End_Scope; | |
1515 | return; | |
1516 | end if; | |
996ae0b0 | 1517 | |
82c80734 RD |
1518 | -- If this is a compilation unit, it must be made visible explicitly, |
1519 | -- because the compilation of the declaration, unlike other library | |
1520 | -- unit declarations, does not. If it is not a unit, the following | |
1521 | -- is redundant but harmless. | |
996ae0b0 RK |
1522 | |
1523 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1524 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1525 | |
ec4867fa ES |
1526 | if Is_Child_Unit (Gen_Id) then |
1527 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1528 | end if; | |
1529 | ||
996ae0b0 | 1530 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 | 1531 | |
90e491a7 | 1532 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
f145ece7 | 1533 | Set_SPARK_Pragma_Inherited (Body_Id); |
579847c2 | 1534 | |
caf07df9 AC |
1535 | -- Analyze any aspect specifications that appear on the generic |
1536 | -- subprogram body. | |
1537 | ||
1538 | if Has_Aspects (N) then | |
e9d08fd7 | 1539 | Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
caf07df9 AC |
1540 | end if; |
1541 | ||
996ae0b0 RK |
1542 | Analyze_Declarations (Declarations (N)); |
1543 | Check_Completion; | |
996ae0b0 | 1544 | |
879ac954 AC |
1545 | -- Process the contract of the subprogram body after all declarations |
1546 | -- have been analyzed. This ensures that any contract-related pragmas | |
1547 | -- are available through the N_Contract node of the body. | |
caf07df9 | 1548 | |
f99ff327 | 1549 | Analyze_Entry_Or_Subprogram_Body_Contract (Body_Id); |
caf07df9 AC |
1550 | |
1551 | Analyze (Handled_Statement_Sequence (N)); | |
996ae0b0 RK |
1552 | Save_Global_References (Original_Node (N)); |
1553 | ||
82c80734 RD |
1554 | -- Prior to exiting the scope, include generic formals again (if any |
1555 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1556 | |
1557 | if Present (First_Ent) then | |
1558 | Set_First_Entity (Gen_Id, First_Ent); | |
1559 | end if; | |
1560 | ||
fbf5a39b | 1561 | Check_References (Gen_Id); |
996ae0b0 RK |
1562 | end; |
1563 | ||
e6f69614 | 1564 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
851e9f19 | 1565 | Update_Use_Clause_Chain; |
3e5400f4 | 1566 | Validate_Categorization_Dependency (N, Gen_Id); |
996ae0b0 RK |
1567 | End_Scope; |
1568 | Check_Subprogram_Order (N); | |
1569 | ||
e895b435 | 1570 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1571 | |
1572 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1573 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1574 | |
1575 | if Style_Check then | |
1576 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1577 | end if; | |
13d923cc | 1578 | |
996ae0b0 | 1579 | End_Generic; |
996ae0b0 RK |
1580 | end Analyze_Generic_Subprogram_Body; |
1581 | ||
4d8f3296 ES |
1582 | ---------------------------- |
1583 | -- Analyze_Null_Procedure -- | |
1584 | ---------------------------- | |
1585 | ||
1586 | procedure Analyze_Null_Procedure | |
1587 | (N : Node_Id; | |
1588 | Is_Completion : out Boolean) | |
1589 | is | |
1590 | Loc : constant Source_Ptr := Sloc (N); | |
1591 | Spec : constant Node_Id := Specification (N); | |
1592 | Designator : Entity_Id; | |
1593 | Form : Node_Id; | |
1594 | Null_Body : Node_Id := Empty; | |
b912db16 | 1595 | Null_Stmt : Node_Id := Null_Statement (Spec); |
4d8f3296 ES |
1596 | Prev : Entity_Id; |
1597 | ||
1598 | begin | |
1599 | -- Capture the profile of the null procedure before analysis, for | |
1600 | -- expansion at the freeze point and at each point of call. The body is | |
1601 | -- used if the procedure has preconditions, or if it is a completion. In | |
1602 | -- the first case the body is analyzed at the freeze point, in the other | |
1603 | -- it replaces the null procedure declaration. | |
1604 | ||
b912db16 AC |
1605 | -- For a null procedure that comes from source, a NULL statement is |
1606 | -- provided by the parser, which carries the source location of the | |
1607 | -- NULL keyword, and has Comes_From_Source set. For a null procedure | |
1608 | -- from expansion, create one now. | |
1609 | ||
1610 | if No (Null_Stmt) then | |
1611 | Null_Stmt := Make_Null_Statement (Loc); | |
1612 | end if; | |
1613 | ||
4d8f3296 ES |
1614 | Null_Body := |
1615 | Make_Subprogram_Body (Loc, | |
611d5e3c AC |
1616 | Specification => New_Copy_Tree (Spec), |
1617 | Declarations => New_List, | |
4d8f3296 ES |
1618 | Handled_Statement_Sequence => |
1619 | Make_Handled_Sequence_Of_Statements (Loc, | |
b912db16 | 1620 | Statements => New_List (Null_Stmt))); |
4d8f3296 ES |
1621 | |
1622 | -- Create new entities for body and formals | |
1623 | ||
1624 | Set_Defining_Unit_Name (Specification (Null_Body), | |
9d2a2071 AC |
1625 | Make_Defining_Identifier |
1626 | (Sloc (Defining_Entity (N)), | |
1627 | Chars (Defining_Entity (N)))); | |
4d8f3296 ES |
1628 | |
1629 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1630 | while Present (Form) loop | |
1631 | Set_Defining_Identifier (Form, | |
9d2a2071 AC |
1632 | Make_Defining_Identifier |
1633 | (Sloc (Defining_Identifier (Form)), | |
1634 | Chars (Defining_Identifier (Form)))); | |
4d8f3296 ES |
1635 | Next (Form); |
1636 | end loop; | |
1637 | ||
1638 | -- Determine whether the null procedure may be a completion of a generic | |
1639 | -- suprogram, in which case we use the new null body as the completion | |
1640 | -- and set minimal semantic information on the original declaration, | |
1641 | -- which is rewritten as a null statement. | |
1642 | ||
1643 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
1644 | ||
1645 | if Present (Prev) and then Is_Generic_Subprogram (Prev) then | |
1646 | Insert_Before (N, Null_Body); | |
1647 | Set_Ekind (Defining_Entity (N), Ekind (Prev)); | |
4d8f3296 ES |
1648 | |
1649 | Rewrite (N, Make_Null_Statement (Loc)); | |
1650 | Analyze_Generic_Subprogram_Body (Null_Body, Prev); | |
1651 | Is_Completion := True; | |
1652 | return; | |
1653 | ||
1654 | else | |
611d5e3c AC |
1655 | -- Resolve the types of the formals now, because the freeze point may |
1656 | -- appear in a different context, e.g. an instantiation. | |
4d8f3296 ES |
1657 | |
1658 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1659 | while Present (Form) loop | |
1660 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
1661 | Find_Type (Parameter_Type (Form)); | |
1662 | ||
611d5e3c AC |
1663 | elsif No (Access_To_Subprogram_Definition |
1664 | (Parameter_Type (Form))) | |
4d8f3296 ES |
1665 | then |
1666 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
1667 | ||
611d5e3c AC |
1668 | -- The case of a null procedure with a formal that is an |
1669 | -- access-to-subprogram type, and that is used as an actual | |
1670 | -- in an instantiation is left to the enthusiastic reader. | |
4d8f3296 | 1671 | |
611d5e3c | 1672 | else |
4d8f3296 ES |
1673 | null; |
1674 | end if; | |
1675 | ||
1676 | Next (Form); | |
1677 | end loop; | |
1678 | end if; | |
1679 | ||
611d5e3c AC |
1680 | -- If there are previous overloadable entities with the same name, check |
1681 | -- whether any of them is completed by the null procedure. | |
4d8f3296 ES |
1682 | |
1683 | if Present (Prev) and then Is_Overloadable (Prev) then | |
1684 | Designator := Analyze_Subprogram_Specification (Spec); | |
1685 | Prev := Find_Corresponding_Spec (N); | |
1686 | end if; | |
1687 | ||
1688 | if No (Prev) or else not Comes_From_Source (Prev) then | |
1689 | Designator := Analyze_Subprogram_Specification (Spec); | |
1690 | Set_Has_Completion (Designator); | |
1691 | ||
1692 | -- Signal to caller that this is a procedure declaration | |
1693 | ||
1694 | Is_Completion := False; | |
1695 | ||
1696 | -- Null procedures are always inlined, but generic formal subprograms | |
1697 | -- which appear as such in the internal instance of formal packages, | |
1698 | -- need no completion and are not marked Inline. | |
1699 | ||
1700 | if Expander_Active | |
1701 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
1702 | then | |
a6354842 | 1703 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); |
4d8f3296 ES |
1704 | Set_Body_To_Inline (N, Null_Body); |
1705 | Set_Is_Inlined (Designator); | |
1706 | end if; | |
1707 | ||
1708 | else | |
2fe258bf AC |
1709 | -- The null procedure is a completion. We unconditionally rewrite |
1710 | -- this as a null body (even if expansion is not active), because | |
1711 | -- there are various error checks that are applied on this body | |
1712 | -- when it is analyzed (e.g. correct aspect placement). | |
4d8f3296 | 1713 | |
c23c86bb | 1714 | if Has_Completion (Prev) then |
a98480dd AC |
1715 | Error_Msg_Sloc := Sloc (Prev); |
1716 | Error_Msg_NE ("duplicate body for & declared#", N, Prev); | |
1717 | end if; | |
1718 | ||
8489c295 AC |
1719 | Check_Previous_Null_Procedure (N, Prev); |
1720 | ||
4d8f3296 | 1721 | Is_Completion := True; |
2fe258bf AC |
1722 | Rewrite (N, Null_Body); |
1723 | Analyze (N); | |
4d8f3296 ES |
1724 | end if; |
1725 | end Analyze_Null_Procedure; | |
1726 | ||
996ae0b0 RK |
1727 | ----------------------------- |
1728 | -- Analyze_Operator_Symbol -- | |
1729 | ----------------------------- | |
1730 | ||
82c80734 RD |
1731 | -- An operator symbol such as "+" or "and" may appear in context where the |
1732 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1733 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1734 | -- generates this node, and the semantics does the disambiguation. Other | |
1735 | -- such case are actuals in an instantiation, the generic unit in an | |
1736 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1737 | |
1738 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1739 | Par : constant Node_Id := Parent (N); | |
1740 | ||
1741 | begin | |
1f0b1e48 | 1742 | if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
996ae0b0 | 1743 | or else Nkind (Par) = N_Function_Instantiation |
1f0b1e48 | 1744 | or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
996ae0b0 | 1745 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1f0b1e48 | 1746 | and then not Is_Pragma_String_Literal (Par)) |
996ae0b0 | 1747 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
800621e0 RD |
1748 | or else (Nkind (Par) = N_Attribute_Reference |
1749 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1750 | then |
1751 | Find_Direct_Name (N); | |
1752 | ||
1753 | else | |
1754 | Change_Operator_Symbol_To_String_Literal (N); | |
1755 | Analyze (N); | |
1756 | end if; | |
1757 | end Analyze_Operator_Symbol; | |
1758 | ||
1759 | ----------------------------------- | |
1760 | -- Analyze_Parameter_Association -- | |
1761 | ----------------------------------- | |
1762 | ||
1763 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1764 | begin | |
1765 | Analyze (Explicit_Actual_Parameter (N)); | |
1766 | end Analyze_Parameter_Association; | |
1767 | ||
1768 | ---------------------------- | |
1769 | -- Analyze_Procedure_Call -- | |
1770 | ---------------------------- | |
1771 | ||
b0bf18ad AC |
1772 | -- WARNING: This routine manages Ghost regions. Return statements must be |
1773 | -- replaced by gotos which jump to the end of the routine and restore the | |
1774 | -- Ghost mode. | |
1775 | ||
996ae0b0 | 1776 | procedure Analyze_Procedure_Call (N : Node_Id) is |
996ae0b0 | 1777 | procedure Analyze_Call_And_Resolve; |
b0bf18ad AC |
1778 | -- Do Analyze and Resolve calls for procedure call. At the end, check |
1779 | -- for illegal order dependence. | |
1780 | -- ??? where is the check for illegal order dependencies? | |
996ae0b0 | 1781 | |
fbf5a39b AC |
1782 | ------------------------------ |
1783 | -- Analyze_Call_And_Resolve -- | |
1784 | ------------------------------ | |
1785 | ||
996ae0b0 RK |
1786 | procedure Analyze_Call_And_Resolve is |
1787 | begin | |
1788 | if Nkind (N) = N_Procedure_Call_Statement then | |
1789 | Analyze_Call (N); | |
1790 | Resolve (N, Standard_Void_Type); | |
1791 | else | |
1792 | Analyze (N); | |
1793 | end if; | |
1794 | end Analyze_Call_And_Resolve; | |
1795 | ||
241ebe89 HK |
1796 | -- Local variables |
1797 | ||
1798 | Actuals : constant List_Id := Parameter_Associations (N); | |
1799 | Loc : constant Source_Ptr := Sloc (N); | |
1800 | P : constant Node_Id := Name (N); | |
f9a8f910 HK |
1801 | |
1802 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; | |
1803 | -- Save the Ghost mode to restore on exit | |
1804 | ||
1805 | Actual : Node_Id; | |
1806 | New_N : Node_Id; | |
241ebe89 | 1807 | |
996ae0b0 RK |
1808 | -- Start of processing for Analyze_Procedure_Call |
1809 | ||
1810 | begin | |
1811 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1812 | -- a procedure call or an entry call. The prefix may denote an access | |
1813 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1814 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1815 | -- then the construct denotes a call to a member of an entire family. |
1816 | -- If the prefix is a simple name, it may still denote a call to a | |
1817 | -- parameterless member of an entry family. Resolution of these various | |
1818 | -- interpretations is delicate. | |
1819 | ||
0fe797c5 SB |
1820 | -- Do not analyze machine code statements to avoid rejecting them in |
1821 | -- CodePeer mode. | |
996ae0b0 | 1822 | |
0fe797c5 SB |
1823 | if CodePeer_Mode and then Nkind (P) = N_Qualified_Expression then |
1824 | Set_Etype (P, Standard_Void_Type); | |
1825 | else | |
1826 | Analyze (P); | |
1827 | end if; | |
1828 | ||
1829 | -- If this is a call of the form Obj.Op, the call may have been analyzed | |
1830 | -- and possibly rewritten into a block, in which case we are done. | |
758c442c GD |
1831 | |
1832 | if Analyzed (N) then | |
1833 | return; | |
758c442c | 1834 | |
7415029d AC |
1835 | -- If there is an error analyzing the name (which may have been |
1836 | -- rewritten if the original call was in prefix notation) then error | |
1837 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1838 | |
90e491a7 | 1839 | elsif Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
996ae0b0 RK |
1840 | Set_Etype (N, Any_Type); |
1841 | return; | |
1842 | end if; | |
1843 | ||
1af4455a HK |
1844 | -- A procedure call is Ghost when its name denotes a Ghost procedure. |
1845 | -- Set the mode now to ensure that any nodes generated during analysis | |
1846 | -- and expansion are properly marked as Ghost. | |
8636f52f | 1847 | |
f9a8f910 | 1848 | Mark_And_Set_Ghost_Procedure_Call (N); |
8636f52f | 1849 | |
996ae0b0 RK |
1850 | -- Otherwise analyze the parameters |
1851 | ||
1852 | if Present (Actuals) then | |
1853 | Actual := First (Actuals); | |
1854 | ||
1855 | while Present (Actual) loop | |
1856 | Analyze (Actual); | |
1857 | Check_Parameterless_Call (Actual); | |
1858 | Next (Actual); | |
1859 | end loop; | |
1860 | end if; | |
1861 | ||
0bfc9a64 | 1862 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1863 | |
1864 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a AC |
1865 | and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
1866 | Name_Elab_Body, | |
1867 | Name_Elab_Subp_Body) | |
996ae0b0 RK |
1868 | then |
1869 | if Present (Actuals) then | |
1870 | Error_Msg_N | |
1871 | ("no parameters allowed for this call", First (Actuals)); | |
d65a80fd | 1872 | goto Leave; |
996ae0b0 RK |
1873 | end if; |
1874 | ||
1875 | Set_Etype (N, Standard_Void_Type); | |
1876 | Set_Analyzed (N); | |
1877 | ||
1878 | elsif Is_Entity_Name (P) | |
1879 | and then Is_Record_Type (Etype (Entity (P))) | |
1880 | and then Remote_AST_I_Dereference (P) | |
1881 | then | |
d65a80fd | 1882 | goto Leave; |
996ae0b0 RK |
1883 | |
1884 | elsif Is_Entity_Name (P) | |
1885 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1886 | then | |
1887 | if Is_Access_Type (Etype (P)) | |
1888 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1889 | and then No (Actuals) | |
1890 | and then Comes_From_Source (N) | |
1891 | then | |
ed2233dc | 1892 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1893 | end if; |
1894 | ||
1895 | Analyze_Call_And_Resolve; | |
1896 | ||
0fe797c5 SB |
1897 | -- If the prefix is the simple name of an entry family, this is a |
1898 | -- parameterless call from within the task body itself. | |
996ae0b0 RK |
1899 | |
1900 | elsif Is_Entity_Name (P) | |
1901 | and then Nkind (P) = N_Identifier | |
1902 | and then Ekind (Entity (P)) = E_Entry_Family | |
1903 | and then Present (Actuals) | |
1904 | and then No (Next (First (Actuals))) | |
1905 | then | |
82c80734 RD |
1906 | -- Can be call to parameterless entry family. What appears to be the |
1907 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1908 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1909 | -- transformation. |
1910 | ||
1911 | New_N := | |
1912 | Make_Indexed_Component (Loc, | |
90e491a7 | 1913 | Prefix => |
996ae0b0 | 1914 | Make_Selected_Component (Loc, |
90e491a7 | 1915 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), |
996ae0b0 RK |
1916 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), |
1917 | Expressions => Actuals); | |
1918 | Set_Name (N, New_N); | |
1919 | Set_Etype (New_N, Standard_Void_Type); | |
1920 | Set_Parameter_Associations (N, No_List); | |
1921 | Analyze_Call_And_Resolve; | |
1922 | ||
1923 | elsif Nkind (P) = N_Explicit_Dereference then | |
1924 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1925 | Analyze_Call_And_Resolve; | |
1926 | else | |
1927 | Error_Msg_N ("expect access to procedure in call", P); | |
1928 | end if; | |
1929 | ||
82c80734 RD |
1930 | -- The name can be a selected component or an indexed component that |
1931 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1932 | -- has parameter associations. | |
996ae0b0 RK |
1933 | |
1934 | elsif Is_Access_Type (Etype (P)) | |
1935 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1936 | then | |
1937 | if Present (Actuals) then | |
1938 | Analyze_Call_And_Resolve; | |
1939 | else | |
ed2233dc | 1940 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1941 | end if; |
1942 | ||
82c80734 RD |
1943 | -- If not an access to subprogram, then the prefix must resolve to the |
1944 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1945 | |
82c80734 RD |
1946 | -- For the case of a simple entry call, P is a selected component where |
1947 | -- the prefix is the task and the selector name is the entry. A call to | |
1948 | -- a protected procedure will have the same syntax. If the protected | |
1949 | -- object contains overloaded operations, the entity may appear as a | |
1950 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1951 | |
1952 | elsif Nkind (P) = N_Selected_Component | |
8fde064e | 1953 | and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
d8f43ee6 HK |
1954 | E_Function, |
1955 | E_Procedure) | |
996ae0b0 | 1956 | then |
0929d66b AC |
1957 | -- When front-end inlining is enabled, as with SPARK_Mode, a call |
1958 | -- in prefix notation may still be missing its controlling argument, | |
1959 | -- so perform the transformation now. | |
1960 | ||
1961 | if SPARK_Mode = On and then In_Inlined_Body then | |
1962 | declare | |
1963 | Subp : constant Entity_Id := Entity (Selector_Name (P)); | |
1964 | Typ : constant Entity_Id := Etype (Prefix (P)); | |
1965 | ||
1966 | begin | |
1967 | if Is_Tagged_Type (Typ) | |
1968 | and then Present (First_Formal (Subp)) | |
e3822b0a YM |
1969 | and then (Etype (First_Formal (Subp)) = Typ |
1970 | or else | |
1971 | Class_Wide_Type (Etype (First_Formal (Subp))) = Typ) | |
0929d66b AC |
1972 | and then Try_Object_Operation (P) |
1973 | then | |
1974 | return; | |
1975 | ||
1976 | else | |
1977 | Analyze_Call_And_Resolve; | |
1978 | end if; | |
1979 | end; | |
1980 | ||
1981 | else | |
1982 | Analyze_Call_And_Resolve; | |
1983 | end if; | |
996ae0b0 RK |
1984 | |
1985 | elsif Nkind (P) = N_Selected_Component | |
1986 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1987 | and then Present (Actuals) | |
1988 | and then No (Next (First (Actuals))) | |
1989 | then | |
82c80734 RD |
1990 | -- Can be call to parameterless entry family. What appears to be the |
1991 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1992 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1993 | -- transformation. |
1994 | ||
1995 | New_N := | |
1996 | Make_Indexed_Component (Loc, | |
d8f43ee6 | 1997 | Prefix => New_Copy (P), |
996ae0b0 RK |
1998 | Expressions => Actuals); |
1999 | Set_Name (N, New_N); | |
2000 | Set_Etype (New_N, Standard_Void_Type); | |
2001 | Set_Parameter_Associations (N, No_List); | |
2002 | Analyze_Call_And_Resolve; | |
2003 | ||
2004 | -- For the case of a reference to an element of an entry family, P is | |
2005 | -- an indexed component whose prefix is a selected component (task and | |
2006 | -- entry family), and whose index is the entry family index. | |
2007 | ||
2008 | elsif Nkind (P) = N_Indexed_Component | |
2009 | and then Nkind (Prefix (P)) = N_Selected_Component | |
2010 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
2011 | then | |
2012 | Analyze_Call_And_Resolve; | |
2013 | ||
2014 | -- If the prefix is the name of an entry family, it is a call from | |
2015 | -- within the task body itself. | |
2016 | ||
2017 | elsif Nkind (P) = N_Indexed_Component | |
2018 | and then Nkind (Prefix (P)) = N_Identifier | |
2019 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
2020 | then | |
2021 | New_N := | |
2022 | Make_Selected_Component (Loc, | |
90e491a7 PMR |
2023 | Prefix => |
2024 | New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
996ae0b0 RK |
2025 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); |
2026 | Rewrite (Prefix (P), New_N); | |
2027 | Analyze (P); | |
2028 | Analyze_Call_And_Resolve; | |
2029 | ||
9f8d1e5c AC |
2030 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
2031 | -- procedure name, so the construct can only be a qualified expression. | |
2032 | ||
2033 | elsif Nkind (P) = N_Qualified_Expression | |
2034 | and then Ada_Version >= Ada_2012 | |
2035 | then | |
2036 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
2037 | Analyze (N); | |
2038 | ||
e895b435 | 2039 | -- Anything else is an error |
996ae0b0 RK |
2040 | |
2041 | else | |
758c442c | 2042 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 | 2043 | end if; |
241ebe89 | 2044 | |
d65a80fd | 2045 | <<Leave>> |
f9a8f910 | 2046 | Restore_Ghost_Mode (Saved_GM); |
996ae0b0 RK |
2047 | end Analyze_Procedure_Call; |
2048 | ||
b0186f71 AC |
2049 | ------------------------------ |
2050 | -- Analyze_Return_Statement -- | |
2051 | ------------------------------ | |
2052 | ||
2053 | procedure Analyze_Return_Statement (N : Node_Id) is | |
d65a80fd HK |
2054 | pragma Assert (Nkind_In (N, N_Extended_Return_Statement, |
2055 | N_Simple_Return_Statement)); | |
b0186f71 AC |
2056 | |
2057 | Returns_Object : constant Boolean := | |
2058 | Nkind (N) = N_Extended_Return_Statement | |
2059 | or else | |
8fde064e AC |
2060 | (Nkind (N) = N_Simple_Return_Statement |
2061 | and then Present (Expression (N))); | |
b0186f71 AC |
2062 | -- True if we're returning something; that is, "return <expression>;" |
2063 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
2064 | -- checking: If Returns_Object is True, N should apply to a function | |
2065 | -- body; otherwise N should apply to a procedure body, entry body, | |
2066 | -- accept statement, or extended return statement. | |
2067 | ||
2068 | function Find_What_It_Applies_To return Entity_Id; | |
2069 | -- Find the entity representing the innermost enclosing body, accept | |
2070 | -- statement, or extended return statement. If the result is a callable | |
2071 | -- construct or extended return statement, then this will be the value | |
2072 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
2073 | -- illegal. See RM-6.5(4/2). | |
2074 | ||
2075 | ----------------------------- | |
2076 | -- Find_What_It_Applies_To -- | |
2077 | ----------------------------- | |
2078 | ||
2079 | function Find_What_It_Applies_To return Entity_Id is | |
2080 | Result : Entity_Id := Empty; | |
2081 | ||
2082 | begin | |
36b8f95f AC |
2083 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
2084 | -- and postconditions. | |
b0186f71 AC |
2085 | |
2086 | for J in reverse 0 .. Scope_Stack.Last loop | |
2087 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
2088 | exit when not Ekind_In (Result, E_Block, E_Loop) |
2089 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
2090 | end loop; |
2091 | ||
2092 | pragma Assert (Present (Result)); | |
2093 | return Result; | |
2094 | end Find_What_It_Applies_To; | |
2095 | ||
2096 | -- Local declarations | |
2097 | ||
2098 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
2099 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
2100 | Loc : constant Source_Ptr := Sloc (N); | |
2101 | Stm_Entity : constant Entity_Id := | |
2102 | New_Internal_Entity | |
2103 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
2104 | ||
2105 | -- Start of processing for Analyze_Return_Statement | |
2106 | ||
2107 | begin | |
2108 | Set_Return_Statement_Entity (N, Stm_Entity); | |
2109 | ||
2110 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
2111 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
2112 | ||
2113 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
2114 | -- (4/2): an inner return statement will apply to this extended return. | |
2115 | ||
2116 | if Nkind (N) = N_Extended_Return_Statement then | |
2117 | Push_Scope (Stm_Entity); | |
2118 | end if; | |
2119 | ||
2120 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
2121 | -- implicitly-generated return that is placed at the end. | |
2122 | ||
2123 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
2124 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
2125 | end if; | |
2126 | ||
2127 | -- Warn on any unassigned OUT parameters if in procedure | |
2128 | ||
2129 | if Ekind (Scope_Id) = E_Procedure then | |
2130 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
2131 | end if; | |
2132 | ||
2133 | -- Check that functions return objects, and other things do not | |
2134 | ||
2135 | if Kind = E_Function or else Kind = E_Generic_Function then | |
2136 | if not Returns_Object then | |
2137 | Error_Msg_N ("missing expression in return from function", N); | |
2138 | end if; | |
2139 | ||
2140 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
2141 | if Returns_Object then | |
2142 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
2143 | end if; | |
2144 | ||
2145 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
2146 | if Returns_Object then | |
2147 | if Is_Protected_Type (Scope (Scope_Id)) then | |
2148 | Error_Msg_N ("entry body cannot return value", N); | |
2149 | else | |
2150 | Error_Msg_N ("accept statement cannot return value", N); | |
2151 | end if; | |
2152 | end if; | |
2153 | ||
2154 | elsif Kind = E_Return_Statement then | |
2155 | ||
2156 | -- We are nested within another return statement, which must be an | |
2157 | -- extended_return_statement. | |
2158 | ||
2159 | if Returns_Object then | |
d0dcb2b1 AC |
2160 | if Nkind (N) = N_Extended_Return_Statement then |
2161 | Error_Msg_N | |
cc96a1b8 | 2162 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
2163 | N); |
2164 | ||
2165 | -- Case of a simple return statement with a value inside extended | |
2166 | -- return statement. | |
2167 | ||
2168 | else | |
2169 | Error_Msg_N | |
3ccedacc AC |
2170 | ("return nested in extended return statement cannot return " |
2171 | & "value (use `RETURN;`)", N); | |
d0dcb2b1 | 2172 | end if; |
b0186f71 AC |
2173 | end if; |
2174 | ||
2175 | else | |
2176 | Error_Msg_N ("illegal context for return statement", N); | |
2177 | end if; | |
2178 | ||
2179 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
2180 | Analyze_Function_Return (N); | |
2181 | ||
2182 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
2183 | Set_Return_Present (Scope_Id); | |
2184 | end if; | |
2185 | ||
2186 | if Nkind (N) = N_Extended_Return_Statement then | |
2187 | End_Scope; | |
2188 | end if; | |
2189 | ||
2190 | Kill_Current_Values (Last_Assignment_Only => True); | |
2191 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
2192 | |
2193 | Analyze_Dimension (N); | |
b0186f71 AC |
2194 | end Analyze_Return_Statement; |
2195 | ||
5d37ba92 ES |
2196 | ------------------------------------- |
2197 | -- Analyze_Simple_Return_Statement -- | |
2198 | ------------------------------------- | |
ec4867fa | 2199 | |
5d37ba92 | 2200 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 2201 | begin |
5d37ba92 ES |
2202 | if Present (Expression (N)) then |
2203 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
2204 | end if; |
2205 | ||
5d37ba92 ES |
2206 | Analyze_Return_Statement (N); |
2207 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 2208 | |
82c80734 RD |
2209 | ------------------------- |
2210 | -- Analyze_Return_Type -- | |
2211 | ------------------------- | |
2212 | ||
2213 | procedure Analyze_Return_Type (N : Node_Id) is | |
2214 | Designator : constant Entity_Id := Defining_Entity (N); | |
2215 | Typ : Entity_Id := Empty; | |
2216 | ||
2217 | begin | |
ec4867fa ES |
2218 | -- Normal case where result definition does not indicate an error |
2219 | ||
41251c60 JM |
2220 | if Result_Definition (N) /= Error then |
2221 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
ce5ba43a | 2222 | Check_SPARK_05_Restriction |
fe5d3068 | 2223 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 2224 | |
b1c11e0e JM |
2225 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
2226 | ||
2227 | declare | |
2228 | AD : constant Node_Id := | |
2229 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
2230 | begin | |
2231 | if Present (AD) and then Protected_Present (AD) then | |
2232 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
2233 | else | |
2234 | Typ := Access_Definition (N, Result_Definition (N)); | |
2235 | end if; | |
2236 | end; | |
2237 | ||
41251c60 JM |
2238 | Set_Parent (Typ, Result_Definition (N)); |
2239 | Set_Is_Local_Anonymous_Access (Typ); | |
2240 | Set_Etype (Designator, Typ); | |
2241 | ||
b66c3ff4 AC |
2242 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
2243 | ||
2244 | Null_Exclusion_Static_Checks (N); | |
2245 | ||
41251c60 JM |
2246 | -- Subtype_Mark case |
2247 | ||
2248 | else | |
2249 | Find_Type (Result_Definition (N)); | |
2250 | Typ := Entity (Result_Definition (N)); | |
2251 | Set_Etype (Designator, Typ); | |
2252 | ||
2ba431e5 | 2253 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 2254 | |
8fde064e | 2255 | if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
ce5ba43a | 2256 | Check_SPARK_05_Restriction |
fe5d3068 | 2257 | ("returning an unconstrained array is not allowed", |
7394c8cc | 2258 | Result_Definition (N)); |
daec8eeb YM |
2259 | end if; |
2260 | ||
b66c3ff4 AC |
2261 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
2262 | ||
2263 | Null_Exclusion_Static_Checks (N); | |
2264 | ||
2265 | -- If a null exclusion is imposed on the result type, then create | |
2266 | -- a null-excluding itype (an access subtype) and use it as the | |
2267 | -- function's Etype. Note that the null exclusion checks are done | |
2268 | -- right before this, because they don't get applied to types that | |
2269 | -- do not come from source. | |
2270 | ||
8fde064e | 2271 | if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
b66c3ff4 AC |
2272 | Set_Etype (Designator, |
2273 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
2274 | (T => Typ, |
2275 | Related_Nod => N, | |
2276 | Scope_Id => Scope (Current_Scope))); | |
2277 | ||
2278 | -- The new subtype must be elaborated before use because | |
2279 | -- it is visible outside of the function. However its base | |
2280 | -- type may not be frozen yet, so the reference that will | |
2281 | -- force elaboration must be attached to the freezing of | |
2282 | -- the base type. | |
2283 | ||
212863c0 AC |
2284 | -- If the return specification appears on a proper body, |
2285 | -- the subtype will have been created already on the spec. | |
2286 | ||
ff7139c3 | 2287 | if Is_Frozen (Typ) then |
212863c0 AC |
2288 | if Nkind (Parent (N)) = N_Subprogram_Body |
2289 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
2290 | then | |
2291 | null; | |
2292 | else | |
2293 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
2294 | end if; | |
2295 | ||
ff7139c3 AC |
2296 | else |
2297 | Ensure_Freeze_Node (Typ); | |
2298 | ||
2299 | declare | |
212863c0 | 2300 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
2301 | begin |
2302 | Set_Itype (IR, Etype (Designator)); | |
2303 | Append_Freeze_Actions (Typ, New_List (IR)); | |
2304 | end; | |
2305 | end if; | |
2306 | ||
b66c3ff4 AC |
2307 | else |
2308 | Set_Etype (Designator, Typ); | |
2309 | end if; | |
2310 | ||
41251c60 JM |
2311 | if Ekind (Typ) = E_Incomplete_Type |
2312 | or else (Is_Class_Wide_Type (Typ) | |
4b6f99f5 | 2313 | and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
41251c60 | 2314 | then |
dd386db0 AC |
2315 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
2316 | -- parts. Untagged incomplete types are not allowed in bodies. | |
b973629e AC |
2317 | -- As a consequence, limited views cannot appear in a basic |
2318 | -- declaration that is itself within a body, because there is | |
2319 | -- no point at which the non-limited view will become visible. | |
dd386db0 AC |
2320 | |
2321 | if Ada_Version >= Ada_2012 then | |
b973629e AC |
2322 | if From_Limited_With (Typ) and then In_Package_Body then |
2323 | Error_Msg_NE | |
2324 | ("invalid use of incomplete type&", | |
3f80a182 | 2325 | Result_Definition (N), Typ); |
b973629e | 2326 | |
1ebc2612 AC |
2327 | -- The return type of a subprogram body cannot be of a |
2328 | -- formal incomplete type. | |
2329 | ||
2330 | elsif Is_Generic_Type (Typ) | |
2331 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2332 | then | |
2333 | Error_Msg_N | |
2334 | ("return type cannot be a formal incomplete type", | |
2335 | Result_Definition (N)); | |
2336 | ||
2337 | elsif Is_Class_Wide_Type (Typ) | |
2338 | and then Is_Generic_Type (Root_Type (Typ)) | |
2339 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2340 | then | |
2341 | Error_Msg_N | |
2342 | ("return type cannot be a formal incomplete type", | |
2343 | Result_Definition (N)); | |
2344 | ||
b973629e | 2345 | elsif Is_Tagged_Type (Typ) then |
dd386db0 AC |
2346 | null; |
2347 | ||
ed09416f AC |
2348 | -- Use is legal in a thunk generated for an operation |
2349 | -- inherited from a progenitor. | |
2350 | ||
2351 | elsif Is_Thunk (Designator) | |
2352 | and then Present (Non_Limited_View (Typ)) | |
2353 | then | |
2354 | null; | |
2355 | ||
5b6f12c7 | 2356 | elsif Nkind (Parent (N)) = N_Subprogram_Body |
31d922e3 AC |
2357 | or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
2358 | N_Entry_Body) | |
dd386db0 AC |
2359 | then |
2360 | Error_Msg_NE | |
2361 | ("invalid use of untagged incomplete type&", | |
2362 | Designator, Typ); | |
2363 | end if; | |
2364 | ||
63be2a5a | 2365 | -- The type must be completed in the current package. This |
31d922e3 | 2366 | -- is checked at the end of the package declaration when |
7b7a0c2b AC |
2367 | -- Taft-amendment types are identified. If the return type |
2368 | -- is class-wide, there is no required check, the type can | |
2369 | -- be a bona fide TAT. | |
63be2a5a AC |
2370 | |
2371 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 2372 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 2373 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
2374 | then |
2375 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
2376 | end if; | |
2377 | ||
dd386db0 AC |
2378 | else |
2379 | Error_Msg_NE | |
2380 | ("invalid use of incomplete type&", Designator, Typ); | |
2381 | end if; | |
41251c60 | 2382 | end if; |
82c80734 RD |
2383 | end if; |
2384 | ||
ec4867fa ES |
2385 | -- Case where result definition does indicate an error |
2386 | ||
82c80734 RD |
2387 | else |
2388 | Set_Etype (Designator, Any_Type); | |
2389 | end if; | |
2390 | end Analyze_Return_Type; | |
2391 | ||
996ae0b0 RK |
2392 | ----------------------------- |
2393 | -- Analyze_Subprogram_Body -- | |
2394 | ----------------------------- | |
2395 | ||
b1b543d2 BD |
2396 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
2397 | Loc : constant Source_Ptr := Sloc (N); | |
2398 | Body_Spec : constant Node_Id := Specification (N); | |
2399 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
2400 | ||
2401 | begin | |
2402 | if Debug_Flag_C then | |
2403 | Write_Str ("==> subprogram body "); | |
2404 | Write_Name (Chars (Body_Id)); | |
2405 | Write_Str (" from "); | |
2406 | Write_Location (Loc); | |
2407 | Write_Eol; | |
2408 | Indent; | |
2409 | end if; | |
2410 | ||
2411 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
2412 | ||
2413 | -- The real work is split out into the helper, so it can do "return;" | |
2414 | -- without skipping the debug output: | |
2415 | ||
2416 | Analyze_Subprogram_Body_Helper (N); | |
2417 | ||
2418 | if Debug_Flag_C then | |
2419 | Outdent; | |
2420 | Write_Str ("<== subprogram body "); | |
2421 | Write_Name (Chars (Body_Id)); | |
2422 | Write_Str (" from "); | |
2423 | Write_Location (Loc); | |
2424 | Write_Eol; | |
2425 | end if; | |
2426 | end Analyze_Subprogram_Body; | |
2427 | ||
2428 | ------------------------------------ | |
2429 | -- Analyze_Subprogram_Body_Helper -- | |
2430 | ------------------------------------ | |
2431 | ||
996ae0b0 RK |
2432 | -- This procedure is called for regular subprogram bodies, generic bodies, |
2433 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
2434 | -- specification matters, and is used to create a proper declaration for | |
2435 | -- the subprogram, or to perform conformance checks. | |
2436 | ||
b0bf18ad AC |
2437 | -- WARNING: This routine manages Ghost regions. Return statements must be |
2438 | -- replaced by gotos which jump to the end of the routine and restore the | |
2439 | -- Ghost mode. | |
2440 | ||
b1b543d2 | 2441 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
d030f3a4 AC |
2442 | Body_Spec : Node_Id := Specification (N); |
2443 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
2444 | Loc : constant Source_Ptr := Sloc (N); | |
2445 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
2446 | ||
2447 | Conformant : Boolean; | |
2448 | Desig_View : Entity_Id := Empty; | |
2449 | Exch_Views : Elist_Id := No_Elist; | |
2450 | HSS : Node_Id; | |
a83d0680 | 2451 | Mask_Types : Elist_Id := No_Elist; |
d030f3a4 AC |
2452 | Prot_Typ : Entity_Id := Empty; |
2453 | Spec_Decl : Node_Id := Empty; | |
2454 | Spec_Id : Entity_Id; | |
21d27997 RD |
2455 | |
2456 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
2457 | -- When we analyze a separate spec, the entity chain ends up containing | |
2458 | -- the formals, as well as any itypes generated during analysis of the | |
2459 | -- default expressions for parameters, or the arguments of associated | |
2460 | -- precondition/postcondition pragmas (which are analyzed in the context | |
2461 | -- of the spec since they have visibility on formals). | |
2462 | -- | |
2463 | -- These entities belong with the spec and not the body. However we do | |
2464 | -- the analysis of the body in the context of the spec (again to obtain | |
2465 | -- visibility to the formals), and all the entities generated during | |
2466 | -- this analysis end up also chained to the entity chain of the spec. | |
2467 | -- But they really belong to the body, and there is circuitry to move | |
2468 | -- them from the spec to the body. | |
2469 | -- | |
2470 | -- However, when we do this move, we don't want to move the real spec | |
2471 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
2472 | -- variable points to the last real spec entity, so we only move those | |
2473 | -- chained beyond that point. It is initialized to Empty to deal with | |
2474 | -- the case where there is no separate spec. | |
996ae0b0 | 2475 | |
ac072cb2 AC |
2476 | function Body_Has_Contract return Boolean; |
2477 | -- Check whether unanalyzed body has an aspect or pragma that may | |
1399d355 | 2478 | -- generate a SPARK contract. |
ac072cb2 | 2479 | |
fd22e260 AC |
2480 | function Body_Has_SPARK_Mode_On return Boolean; |
2481 | -- Check whether SPARK_Mode On applies to the subprogram body, either | |
2482 | -- because it is specified directly on the body, or because it is | |
2483 | -- inherited from the enclosing subprogram or package. | |
2484 | ||
8d1fe980 AC |
2485 | procedure Build_Subprogram_Declaration; |
2486 | -- Create a matching subprogram declaration for subprogram body N | |
2487 | ||
ec4867fa | 2488 | procedure Check_Anonymous_Return; |
e50e1c5e | 2489 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
2490 | -- or a type that contains tasks, we must create a master entity for |
2491 | -- the anonymous type, which typically will be used in an allocator | |
2492 | -- in the body of the function. | |
2493 | ||
e660dbf7 JM |
2494 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
2495 | -- Look ahead to recognize a pragma that may appear after the body. | |
2496 | -- If there is a previous spec, check that it appears in the same | |
2497 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
2498 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
2499 | -- If the body acts as a spec, and inlining is required, we create a | |
2500 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
2501 | -- If pragma does not appear after the body, check whether there is |
2502 | -- an inline pragma before any local declarations. | |
c37bb106 | 2503 | |
7665e4bd AC |
2504 | procedure Check_Missing_Return; |
2505 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
2506 | -- the warning checks implemented by Check_Returns. In formal mode, also |
2507 | -- verify that a function ends with a RETURN and that a procedure does | |
2508 | -- not contain any RETURN. | |
7665e4bd | 2509 | |
d44202ba HK |
2510 | function Disambiguate_Spec return Entity_Id; |
2511 | -- When a primitive is declared between the private view and the full | |
2512 | -- view of a concurrent type which implements an interface, a special | |
2513 | -- mechanism is used to find the corresponding spec of the primitive | |
2514 | -- body. | |
2515 | ||
1e55d29a | 2516 | function Exchange_Limited_Views (Subp_Id : Entity_Id) return Elist_Id; |
5dcab3ca | 2517 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains |
1e55d29a EB |
2518 | -- incomplete types coming from a limited context and replace their |
2519 | -- limited views with the non-limited ones. Return the list of changes | |
2520 | -- to be used to undo the transformation. | |
5dcab3ca | 2521 | |
d44202ba HK |
2522 | function Is_Private_Concurrent_Primitive |
2523 | (Subp_Id : Entity_Id) return Boolean; | |
2524 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
2525 | -- type that implements an interface and has a private view. | |
2526 | ||
a83d0680 AC |
2527 | function Mask_Unfrozen_Types (Spec_Id : Entity_Id) return Elist_Id; |
2528 | -- N is the body generated for an expression function that is not a | |
2529 | -- completion and Spec_Id the defining entity of its spec. Mark all | |
2530 | -- the not-yet-frozen types referenced by the simple return statement | |
2531 | -- of the function as formally frozen. | |
2532 | ||
1e55d29a EB |
2533 | procedure Restore_Limited_Views (Restore_List : Elist_Id); |
2534 | -- Undo the transformation done by Exchange_Limited_Views. | |
2535 | ||
76a69663 ES |
2536 | procedure Set_Trivial_Subprogram (N : Node_Id); |
2537 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
2538 | -- subprogram whose body is being analyzed. N is the statement node | |
2539 | -- causing the flag to be set, if the following statement is a return | |
2540 | -- of an entity, we mark the entity as set in source to suppress any | |
2541 | -- warning on the stylized use of function stubs with a dummy return. | |
2542 | ||
a83d0680 AC |
2543 | procedure Unmask_Unfrozen_Types (Unmask_List : Elist_Id); |
2544 | -- Undo the transformation done by Mask_Unfrozen_Types | |
2545 | ||
758c442c GD |
2546 | procedure Verify_Overriding_Indicator; |
2547 | -- If there was a previous spec, the entity has been entered in the | |
2548 | -- current scope previously. If the body itself carries an overriding | |
2549 | -- indicator, check that it is consistent with the known status of the | |
2550 | -- entity. | |
2551 | ||
ac072cb2 AC |
2552 | ----------------------- |
2553 | -- Body_Has_Contract -- | |
2554 | ----------------------- | |
2555 | ||
2556 | function Body_Has_Contract return Boolean is | |
8d1fe980 AC |
2557 | Decls : constant List_Id := Declarations (N); |
2558 | Item : Node_Id; | |
ac072cb2 AC |
2559 | |
2560 | begin | |
33398e3c | 2561 | -- Check for aspects that may generate a contract |
ac072cb2 AC |
2562 | |
2563 | if Present (Aspect_Specifications (N)) then | |
8d1fe980 AC |
2564 | Item := First (Aspect_Specifications (N)); |
2565 | while Present (Item) loop | |
33398e3c | 2566 | if Is_Subprogram_Contract_Annotation (Item) then |
ac072cb2 AC |
2567 | return True; |
2568 | end if; | |
2569 | ||
8d1fe980 | 2570 | Next (Item); |
ac072cb2 AC |
2571 | end loop; |
2572 | end if; | |
2573 | ||
1399d355 | 2574 | -- Check for pragmas that may generate a contract |
ac072cb2 AC |
2575 | |
2576 | if Present (Decls) then | |
8d1fe980 AC |
2577 | Item := First (Decls); |
2578 | while Present (Item) loop | |
2579 | if Nkind (Item) = N_Pragma | |
33398e3c | 2580 | and then Is_Subprogram_Contract_Annotation (Item) |
8d1fe980 AC |
2581 | then |
2582 | return True; | |
ac072cb2 AC |
2583 | end if; |
2584 | ||
8d1fe980 | 2585 | Next (Item); |
ac072cb2 AC |
2586 | end loop; |
2587 | end if; | |
2588 | ||
2589 | return False; | |
2590 | end Body_Has_Contract; | |
2591 | ||
fd22e260 AC |
2592 | ---------------------------- |
2593 | -- Body_Has_SPARK_Mode_On -- | |
2594 | ---------------------------- | |
2595 | ||
2596 | function Body_Has_SPARK_Mode_On return Boolean is | |
2597 | Decls : constant List_Id := Declarations (N); | |
2598 | Item : Node_Id; | |
2599 | ||
2600 | begin | |
2601 | -- Check for SPARK_Mode aspect | |
2602 | ||
2603 | if Present (Aspect_Specifications (N)) then | |
2604 | Item := First (Aspect_Specifications (N)); | |
2605 | while Present (Item) loop | |
2606 | if Get_Aspect_Id (Item) = Aspect_SPARK_Mode then | |
933aa0ac | 2607 | return Get_SPARK_Mode_From_Annotation (Item) = On; |
fd22e260 AC |
2608 | end if; |
2609 | ||
2610 | Next (Item); | |
2611 | end loop; | |
2612 | end if; | |
2613 | ||
2614 | -- Check for SPARK_Mode pragma | |
2615 | ||
2616 | if Present (Decls) then | |
2617 | Item := First (Decls); | |
2618 | while Present (Item) loop | |
933aa0ac AC |
2619 | |
2620 | -- Pragmas that apply to a subprogram body are usually grouped | |
2621 | -- together. Look for a potential pragma SPARK_Mode among them. | |
2622 | ||
2623 | if Nkind (Item) = N_Pragma then | |
2624 | if Get_Pragma_Id (Item) = Pragma_SPARK_Mode then | |
2625 | return Get_SPARK_Mode_From_Annotation (Item) = On; | |
2626 | end if; | |
2627 | ||
2628 | -- Otherwise the first non-pragma declarative item terminates | |
2629 | -- the region where pragma SPARK_Mode may appear. | |
2630 | ||
2631 | else | |
2632 | exit; | |
fd22e260 AC |
2633 | end if; |
2634 | ||
2635 | Next (Item); | |
2636 | end loop; | |
2637 | end if; | |
2638 | ||
933aa0ac AC |
2639 | -- Otherwise, the applicable SPARK_Mode is inherited from the |
2640 | -- enclosing subprogram or package. | |
fd22e260 AC |
2641 | |
2642 | return SPARK_Mode = On; | |
2643 | end Body_Has_SPARK_Mode_On; | |
2644 | ||
8d1fe980 AC |
2645 | ---------------------------------- |
2646 | -- Build_Subprogram_Declaration -- | |
2647 | ---------------------------------- | |
2648 | ||
2649 | procedure Build_Subprogram_Declaration is | |
3f8c04e7 AC |
2650 | procedure Move_Pragmas (From : Node_Id; To : Node_Id); |
2651 | -- Relocate certain categorization pragmas from the declarative list | |
2652 | -- of subprogram body From and insert them after node To. The pragmas | |
2653 | -- in question are: | |
2654 | -- Ghost | |
3f8c04e7 | 2655 | -- Volatile_Function |
0a3ec628 AC |
2656 | -- Also copy pragma SPARK_Mode if present in the declarative list |
2657 | -- of subprogram body From and insert it after node To. This pragma | |
2658 | -- should not be moved, as it applies to the body too. | |
3f8c04e7 AC |
2659 | |
2660 | ------------------ | |
2661 | -- Move_Pragmas -- | |
2662 | ------------------ | |
2663 | ||
2664 | procedure Move_Pragmas (From : Node_Id; To : Node_Id) is | |
2665 | Decl : Node_Id; | |
2666 | Next_Decl : Node_Id; | |
2667 | ||
2668 | begin | |
2669 | pragma Assert (Nkind (From) = N_Subprogram_Body); | |
2670 | ||
7f54dc83 | 2671 | -- The destination node must be part of a list, as the pragmas are |
3f8c04e7 AC |
2672 | -- inserted after it. |
2673 | ||
2674 | pragma Assert (Is_List_Member (To)); | |
2675 | ||
2676 | -- Inspect the declarations of the subprogram body looking for | |
2677 | -- specific pragmas. | |
2678 | ||
2679 | Decl := First (Declarations (N)); | |
2680 | while Present (Decl) loop | |
2681 | Next_Decl := Next (Decl); | |
2682 | ||
0a3ec628 AC |
2683 | if Nkind (Decl) = N_Pragma then |
2684 | if Pragma_Name_Unmapped (Decl) = Name_SPARK_Mode then | |
2685 | Insert_After (To, New_Copy_Tree (Decl)); | |
2686 | ||
2687 | elsif Nam_In (Pragma_Name_Unmapped (Decl), | |
2688 | Name_Ghost, | |
2689 | Name_Volatile_Function) | |
2690 | then | |
2691 | Remove (Decl); | |
2692 | Insert_After (To, Decl); | |
2693 | end if; | |
3f8c04e7 AC |
2694 | end if; |
2695 | ||
2696 | Decl := Next_Decl; | |
2697 | end loop; | |
2698 | end Move_Pragmas; | |
2699 | ||
2700 | -- Local variables | |
2701 | ||
8d1fe980 AC |
2702 | Decl : Node_Id; |
2703 | Subp_Decl : Node_Id; | |
2704 | ||
3f8c04e7 AC |
2705 | -- Start of processing for Build_Subprogram_Declaration |
2706 | ||
8d1fe980 AC |
2707 | begin |
2708 | -- Create a matching subprogram spec using the profile of the body. | |
2709 | -- The structure of the tree is identical, but has new entities for | |
2710 | -- the defining unit name and formal parameters. | |
2711 | ||
2712 | Subp_Decl := | |
2713 | Make_Subprogram_Declaration (Loc, | |
2714 | Specification => Copy_Subprogram_Spec (Body_Spec)); | |
877a5a12 | 2715 | Set_Comes_From_Source (Subp_Decl, True); |
8d1fe980 | 2716 | |
3f8c04e7 AC |
2717 | -- Relocate the aspects and relevant pragmas from the subprogram body |
2718 | -- to the generated spec because it acts as the initial declaration. | |
8d1fe980 | 2719 | |
3f8c04e7 | 2720 | Insert_Before (N, Subp_Decl); |
8d1fe980 | 2721 | Move_Aspects (N, To => Subp_Decl); |
3f8c04e7 | 2722 | Move_Pragmas (N, To => Subp_Decl); |
8d1fe980 | 2723 | |
0a3ec628 AC |
2724 | -- Ensure that the generated corresponding spec and original body |
2725 | -- share the same SPARK_Mode pragma or aspect. As a result, both have | |
2726 | -- the same SPARK_Mode attributes, and the global SPARK_Mode value is | |
2727 | -- correctly set for local subprograms. | |
2728 | ||
2729 | Copy_SPARK_Mode_Aspect (Subp_Decl, To => N); | |
2730 | ||
3f8c04e7 AC |
2731 | Analyze (Subp_Decl); |
2732 | ||
888be6b1 AC |
2733 | -- Propagate the attributes Rewritten_For_C and Corresponding_Proc to |
2734 | -- the body since the expander may generate calls using that entity. | |
2735 | -- Required to ensure that Expand_Call rewrites calls to this | |
2736 | -- function by calls to the built procedure. | |
2737 | ||
2738 | if Modify_Tree_For_C | |
2739 | and then Nkind (Body_Spec) = N_Function_Specification | |
2740 | and then | |
2741 | Rewritten_For_C (Defining_Entity (Specification (Subp_Decl))) | |
2742 | then | |
2743 | Set_Rewritten_For_C (Defining_Entity (Body_Spec)); | |
2744 | Set_Corresponding_Procedure (Defining_Entity (Body_Spec), | |
2745 | Corresponding_Procedure | |
2746 | (Defining_Entity (Specification (Subp_Decl)))); | |
aeb98f1d JM |
2747 | end if; |
2748 | ||
3f8c04e7 AC |
2749 | -- Analyze any relocated source pragmas or pragmas created for aspect |
2750 | -- specifications. | |
8d1fe980 AC |
2751 | |
2752 | Decl := Next (Subp_Decl); | |
2753 | while Present (Decl) loop | |
2754 | ||
2755 | -- Stop the search for pragmas once the body has been reached as | |
2756 | -- this terminates the region where pragmas may appear. | |
2757 | ||
2758 | if Decl = N then | |
2759 | exit; | |
2760 | ||
2761 | elsif Nkind (Decl) = N_Pragma then | |
2762 | Analyze (Decl); | |
2763 | end if; | |
2764 | ||
2765 | Next (Decl); | |
2766 | end loop; | |
2767 | ||
2768 | Spec_Id := Defining_Entity (Subp_Decl); | |
2769 | Set_Corresponding_Spec (N, Spec_Id); | |
2770 | ||
2771 | -- Mark the generated spec as a source construct to ensure that all | |
2772 | -- calls to it are properly registered in ALI files for GNATprove. | |
2773 | ||
2774 | Set_Comes_From_Source (Spec_Id, True); | |
2775 | ||
8d1fe980 AC |
2776 | -- Ensure that the specs of the subprogram declaration and its body |
2777 | -- are identical, otherwise they will appear non-conformant due to | |
2778 | -- rewritings in the default values of formal parameters. | |
2779 | ||
2780 | Body_Spec := Copy_Subprogram_Spec (Body_Spec); | |
2781 | Set_Specification (N, Body_Spec); | |
2782 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); | |
2783 | end Build_Subprogram_Declaration; | |
2784 | ||
ec4867fa ES |
2785 | ---------------------------- |
2786 | -- Check_Anonymous_Return -- | |
2787 | ---------------------------- | |
2788 | ||
2789 | procedure Check_Anonymous_Return is | |
2790 | Decl : Node_Id; | |
a523b302 | 2791 | Par : Node_Id; |
ec4867fa ES |
2792 | Scop : Entity_Id; |
2793 | ||
2794 | begin | |
2795 | if Present (Spec_Id) then | |
2796 | Scop := Spec_Id; | |
2797 | else | |
2798 | Scop := Body_Id; | |
2799 | end if; | |
2800 | ||
2801 | if Ekind (Scop) = E_Function | |
2802 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 | 2803 | and then not Is_Thunk (Scop) |
4b963531 AC |
2804 | |
2805 | -- Skip internally built functions which handle the case of | |
2806 | -- a null access (see Expand_Interface_Conversion) | |
2807 | ||
2808 | and then not (Is_Interface (Designated_Type (Etype (Scop))) | |
4b6f99f5 | 2809 | and then not Comes_From_Source (Parent (Scop))) |
4b963531 | 2810 | |
a523b302 JM |
2811 | and then (Has_Task (Designated_Type (Etype (Scop))) |
2812 | or else | |
4b6f99f5 RD |
2813 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) |
2814 | and then | |
2815 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 2816 | and then Expander_Active |
b20de9b9 | 2817 | |
8fde064e | 2818 | -- Avoid cases with no tasking support |
b20de9b9 AC |
2819 | |
2820 | and then RTE_Available (RE_Current_Master) | |
2821 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
2822 | then |
2823 | Decl := | |
2824 | Make_Object_Declaration (Loc, | |
2825 | Defining_Identifier => | |
2826 | Make_Defining_Identifier (Loc, Name_uMaster), | |
2827 | Constant_Present => True, | |
2828 | Object_Definition => | |
e4494292 | 2829 | New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
ec4867fa ES |
2830 | Expression => |
2831 | Make_Explicit_Dereference (Loc, | |
e4494292 | 2832 | New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
ec4867fa ES |
2833 | |
2834 | if Present (Declarations (N)) then | |
2835 | Prepend (Decl, Declarations (N)); | |
2836 | else | |
2837 | Set_Declarations (N, New_List (Decl)); | |
2838 | end if; | |
2839 | ||
2840 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
2841 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
2842 | |
2843 | -- Now mark the containing scope as a task master | |
2844 | ||
2845 | Par := N; | |
2846 | while Nkind (Par) /= N_Compilation_Unit loop | |
2847 | Par := Parent (Par); | |
2848 | pragma Assert (Present (Par)); | |
2849 | ||
2850 | -- If we fall off the top, we are at the outer level, and | |
2851 | -- the environment task is our effective master, so nothing | |
2852 | -- to mark. | |
2853 | ||
2854 | if Nkind_In | |
2855 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
2856 | then | |
2857 | Set_Is_Task_Master (Par, True); | |
2858 | exit; | |
2859 | end if; | |
2860 | end loop; | |
ec4867fa ES |
2861 | end if; |
2862 | end Check_Anonymous_Return; | |
2863 | ||
e660dbf7 JM |
2864 | ------------------------- |
2865 | -- Check_Inline_Pragma -- | |
2866 | ------------------------- | |
758c442c | 2867 | |
e660dbf7 JM |
2868 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
2869 | Prag : Node_Id; | |
2870 | Plist : List_Id; | |
0fb2ea01 | 2871 | |
21d27997 | 2872 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 2873 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 2874 | -- to this subprogram. |
21d27997 RD |
2875 | |
2876 | ----------------------- | |
2877 | -- Is_Inline_Pragma -- | |
2878 | ----------------------- | |
2879 | ||
2880 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
2881 | begin | |
b269f477 | 2882 | if Nkind (N) = N_Pragma |
21d27997 | 2883 | and then |
6e759c2a BD |
2884 | (Pragma_Name_Unmapped (N) = Name_Inline_Always |
2885 | or else (Pragma_Name_Unmapped (N) = Name_Inline | |
87feba05 AC |
2886 | and then |
2887 | (Front_End_Inlining or else Optimization_Level > 0))) | |
274c2cda | 2888 | and then Present (Pragma_Argument_Associations (N)) |
b269f477 BD |
2889 | then |
2890 | declare | |
2891 | Pragma_Arg : Node_Id := | |
2892 | Expression (First (Pragma_Argument_Associations (N))); | |
2893 | begin | |
2894 | if Nkind (Pragma_Arg) = N_Selected_Component then | |
2895 | Pragma_Arg := Selector_Name (Pragma_Arg); | |
2896 | end if; | |
2897 | ||
2898 | return Chars (Pragma_Arg) = Chars (Body_Id); | |
2899 | end; | |
2900 | ||
2901 | else | |
2902 | return False; | |
2903 | end if; | |
21d27997 RD |
2904 | end Is_Inline_Pragma; |
2905 | ||
2906 | -- Start of processing for Check_Inline_Pragma | |
2907 | ||
c37bb106 | 2908 | begin |
e660dbf7 JM |
2909 | if not Expander_Active then |
2910 | return; | |
2911 | end if; | |
2912 | ||
2913 | if Is_List_Member (N) | |
2914 | and then Present (Next (N)) | |
21d27997 | 2915 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2916 | then |
2917 | Prag := Next (N); | |
2918 | ||
21d27997 RD |
2919 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2920 | and then Present (Declarations (N)) | |
2921 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2922 | then | |
2923 | Prag := First (Declarations (N)); | |
2924 | ||
e660dbf7 JM |
2925 | else |
2926 | Prag := Empty; | |
c37bb106 | 2927 | end if; |
e660dbf7 JM |
2928 | |
2929 | if Present (Prag) then | |
2930 | if Present (Spec_Id) then | |
b269f477 BD |
2931 | if Is_List_Member (N) |
2932 | and then Is_List_Member (Unit_Declaration_Node (Spec_Id)) | |
2933 | and then In_Same_List (N, Unit_Declaration_Node (Spec_Id)) | |
2934 | then | |
e660dbf7 JM |
2935 | Analyze (Prag); |
2936 | end if; | |
2937 | ||
2938 | else | |
274c2cda AC |
2939 | -- Create a subprogram declaration, to make treatment uniform. |
2940 | -- Make the sloc of the subprogram name that of the entity in | |
2941 | -- the body, so that style checks find identical strings. | |
e660dbf7 JM |
2942 | |
2943 | declare | |
2944 | Subp : constant Entity_Id := | |
274c2cda AC |
2945 | Make_Defining_Identifier |
2946 | (Sloc (Body_Id), Chars (Body_Id)); | |
e660dbf7 | 2947 | Decl : constant Node_Id := |
30196a76 RD |
2948 | Make_Subprogram_Declaration (Loc, |
2949 | Specification => | |
2950 | New_Copy_Tree (Specification (N))); | |
2951 | ||
e660dbf7 | 2952 | begin |
2eda24e9 PMR |
2953 | -- Link the body and the generated spec |
2954 | ||
2955 | Set_Corresponding_Body (Decl, Body_Id); | |
2956 | Set_Corresponding_Spec (N, Subp); | |
2957 | ||
e660dbf7 JM |
2958 | Set_Defining_Unit_Name (Specification (Decl), Subp); |
2959 | ||
4afcf3a5 AC |
2960 | -- To ensure proper coverage when body is inlined, indicate |
2961 | -- whether the subprogram comes from source. | |
2962 | ||
2963 | Set_Comes_From_Source (Subp, Comes_From_Source (N)); | |
2964 | ||
e660dbf7 | 2965 | if Present (First_Formal (Body_Id)) then |
21d27997 | 2966 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2967 | Set_Parameter_Specifications |
2968 | (Specification (Decl), Plist); | |
2969 | end if; | |
2970 | ||
a5fa1522 JM |
2971 | -- Move aspects to the new spec |
2972 | ||
2973 | if Has_Aspects (N) then | |
2974 | Move_Aspects (N, To => Decl); | |
2975 | end if; | |
2976 | ||
e660dbf7 JM |
2977 | Insert_Before (N, Decl); |
2978 | Analyze (Decl); | |
2979 | Analyze (Prag); | |
2980 | Set_Has_Pragma_Inline (Subp); | |
2981 | ||
6e759c2a | 2982 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2983 | Set_Is_Inlined (Subp); |
21d27997 | 2984 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2985 | end if; |
2986 | ||
158d55fa AC |
2987 | -- Prior to copying the subprogram body to create a template |
2988 | -- for it for subsequent inlining, remove the pragma from | |
2989 | -- the current body so that the copy that will produce the | |
2990 | -- new body will start from a completely unanalyzed tree. | |
2991 | ||
2992 | if Nkind (Parent (Prag)) = N_Subprogram_Body then | |
2993 | Rewrite (Prag, Make_Null_Statement (Sloc (Prag))); | |
2994 | end if; | |
2995 | ||
e660dbf7 JM |
2996 | Spec := Subp; |
2997 | end; | |
2998 | end if; | |
2999 | end if; | |
3000 | end Check_Inline_Pragma; | |
3001 | ||
7665e4bd AC |
3002 | -------------------------- |
3003 | -- Check_Missing_Return -- | |
3004 | -------------------------- | |
3005 | ||
3006 | procedure Check_Missing_Return is | |
3007 | Id : Entity_Id; | |
3008 | Missing_Ret : Boolean; | |
3009 | ||
3010 | begin | |
3011 | if Nkind (Body_Spec) = N_Function_Specification then | |
3012 | if Present (Spec_Id) then | |
3013 | Id := Spec_Id; | |
3014 | else | |
3015 | Id := Body_Id; | |
3016 | end if; | |
3017 | ||
fe5d3068 | 3018 | if Return_Present (Id) then |
7665e4bd AC |
3019 | Check_Returns (HSS, 'F', Missing_Ret); |
3020 | ||
3021 | if Missing_Ret then | |
3022 | Set_Has_Missing_Return (Id); | |
3023 | end if; | |
3024 | ||
241fac51 ES |
3025 | -- Within a premature instantiation of a package with no body, we |
3026 | -- build completions of the functions therein, with a Raise | |
3027 | -- statement. No point in complaining about a missing return in | |
3028 | -- this case. | |
3029 | ||
3030 | elsif Ekind (Id) = E_Function | |
3031 | and then In_Instance | |
3032 | and then Present (Statements (HSS)) | |
3033 | and then Nkind (First (Statements (HSS))) = N_Raise_Program_Error | |
3034 | then | |
3035 | null; | |
3036 | ||
2aca76d6 AC |
3037 | elsif Is_Generic_Subprogram (Id) |
3038 | or else not Is_Machine_Code_Subprogram (Id) | |
7665e4bd AC |
3039 | then |
3040 | Error_Msg_N ("missing RETURN statement in function body", N); | |
3041 | end if; | |
3042 | ||
fe5d3068 | 3043 | -- If procedure with No_Return, check returns |
607d0635 | 3044 | |
fe5d3068 YM |
3045 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
3046 | and then Present (Spec_Id) | |
3047 | and then No_Return (Spec_Id) | |
607d0635 | 3048 | then |
fe5d3068 YM |
3049 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
3050 | end if; | |
3051 | ||
ad05f2e9 | 3052 | -- Special checks in SPARK mode |
fe5d3068 YM |
3053 | |
3054 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 3055 | |
ad05f2e9 | 3056 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
3057 | |
3058 | declare | |
3059 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
3060 | begin | |
3061 | if Present (Stat) | |
7394c8cc AC |
3062 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
3063 | N_Extended_Return_Statement) | |
fe5d3068 | 3064 | then |
ce5ba43a | 3065 | Check_SPARK_05_Restriction |
fe5d3068 YM |
3066 | ("last statement in function should be RETURN", Stat); |
3067 | end if; | |
3068 | end; | |
3069 | ||
ad05f2e9 | 3070 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
3071 | |
3072 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
3073 | if Present (Spec_Id) then |
3074 | Id := Spec_Id; | |
3075 | else | |
3076 | Id := Body_Id; | |
3077 | end if; | |
3078 | ||
8d606a78 RD |
3079 | -- Would be nice to point to return statement here, can we |
3080 | -- borrow the Check_Returns procedure here ??? | |
3081 | ||
607d0635 | 3082 | if Return_Present (Id) then |
ce5ba43a | 3083 | Check_SPARK_05_Restriction |
fe5d3068 | 3084 | ("procedure should not have RETURN", N); |
607d0635 | 3085 | end if; |
7665e4bd AC |
3086 | end if; |
3087 | end Check_Missing_Return; | |
3088 | ||
d44202ba HK |
3089 | ----------------------- |
3090 | -- Disambiguate_Spec -- | |
3091 | ----------------------- | |
3092 | ||
3093 | function Disambiguate_Spec return Entity_Id is | |
3094 | Priv_Spec : Entity_Id; | |
3095 | Spec_N : Entity_Id; | |
3096 | ||
3097 | procedure Replace_Types (To_Corresponding : Boolean); | |
3098 | -- Depending on the flag, replace the type of formal parameters of | |
3099 | -- Body_Id if it is a concurrent type implementing interfaces with | |
3100 | -- the corresponding record type or the other way around. | |
3101 | ||
3102 | procedure Replace_Types (To_Corresponding : Boolean) is | |
3103 | Formal : Entity_Id; | |
3104 | Formal_Typ : Entity_Id; | |
3105 | ||
3106 | begin | |
3107 | Formal := First_Formal (Body_Id); | |
3108 | while Present (Formal) loop | |
3109 | Formal_Typ := Etype (Formal); | |
3110 | ||
df3e68b1 HK |
3111 | if Is_Class_Wide_Type (Formal_Typ) then |
3112 | Formal_Typ := Root_Type (Formal_Typ); | |
3113 | end if; | |
3114 | ||
d44202ba HK |
3115 | -- From concurrent type to corresponding record |
3116 | ||
3117 | if To_Corresponding then | |
3118 | if Is_Concurrent_Type (Formal_Typ) | |
3119 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4b6f99f5 RD |
3120 | and then |
3121 | Present (Interfaces | |
3122 | (Corresponding_Record_Type (Formal_Typ))) | |
d44202ba HK |
3123 | then |
3124 | Set_Etype (Formal, | |
3125 | Corresponding_Record_Type (Formal_Typ)); | |
3126 | end if; | |
3127 | ||
3128 | -- From corresponding record to concurrent type | |
3129 | ||
3130 | else | |
3131 | if Is_Concurrent_Record_Type (Formal_Typ) | |
3132 | and then Present (Interfaces (Formal_Typ)) | |
3133 | then | |
3134 | Set_Etype (Formal, | |
3135 | Corresponding_Concurrent_Type (Formal_Typ)); | |
3136 | end if; | |
3137 | end if; | |
3138 | ||
3139 | Next_Formal (Formal); | |
3140 | end loop; | |
3141 | end Replace_Types; | |
3142 | ||
3143 | -- Start of processing for Disambiguate_Spec | |
3144 | ||
3145 | begin | |
3146 | -- Try to retrieve the specification of the body as is. All error | |
3147 | -- messages are suppressed because the body may not have a spec in | |
3148 | -- its current state. | |
3149 | ||
3150 | Spec_N := Find_Corresponding_Spec (N, False); | |
3151 | ||
3152 | -- It is possible that this is the body of a primitive declared | |
3153 | -- between a private and a full view of a concurrent type. The | |
3154 | -- controlling parameter of the spec carries the concurrent type, | |
3155 | -- not the corresponding record type as transformed by Analyze_ | |
3156 | -- Subprogram_Specification. In such cases, we undo the change | |
3157 | -- made by the analysis of the specification and try to find the | |
3158 | -- spec again. | |
766d7add | 3159 | |
8198b93d HK |
3160 | -- Note that wrappers already have their corresponding specs and |
3161 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 3162 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 3163 | -- original concurrent status. |
d44202ba | 3164 | |
8198b93d HK |
3165 | if No (Spec_N) |
3166 | or else Is_Primitive_Wrapper (Spec_N) | |
3167 | then | |
d44202ba HK |
3168 | -- Restore all references of corresponding record types to the |
3169 | -- original concurrent types. | |
3170 | ||
3171 | Replace_Types (To_Corresponding => False); | |
3172 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
3173 | ||
3174 | -- The current body truly belongs to a primitive declared between | |
3175 | -- a private and a full view. We leave the modified body as is, | |
3176 | -- and return the true spec. | |
3177 | ||
3178 | if Present (Priv_Spec) | |
3179 | and then Is_Private_Primitive (Priv_Spec) | |
3180 | then | |
3181 | return Priv_Spec; | |
3182 | end if; | |
3183 | ||
3184 | -- In case that this is some sort of error, restore the original | |
3185 | -- state of the body. | |
3186 | ||
3187 | Replace_Types (To_Corresponding => True); | |
3188 | end if; | |
3189 | ||
3190 | return Spec_N; | |
3191 | end Disambiguate_Spec; | |
3192 | ||
5dcab3ca AC |
3193 | ---------------------------- |
3194 | -- Exchange_Limited_Views -- | |
3195 | ---------------------------- | |
3196 | ||
1e55d29a EB |
3197 | function Exchange_Limited_Views (Subp_Id : Entity_Id) return Elist_Id is |
3198 | Result : Elist_Id := No_Elist; | |
3199 | ||
5dcab3ca AC |
3200 | procedure Detect_And_Exchange (Id : Entity_Id); |
3201 | -- Determine whether Id's type denotes an incomplete type associated | |
3202 | -- with a limited with clause and exchange the limited view with the | |
72d5c70b AC |
3203 | -- non-limited one when available. Note that the non-limited view |
3204 | -- may exist because of a with_clause in another unit in the context, | |
3205 | -- but cannot be used because the current view of the enclosing unit | |
3206 | -- is still a limited view. | |
5dcab3ca AC |
3207 | |
3208 | ------------------------- | |
3209 | -- Detect_And_Exchange -- | |
3210 | ------------------------- | |
3211 | ||
3212 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
3213 | Typ : constant Entity_Id := Etype (Id); | |
5dcab3ca | 3214 | begin |
72d5c70b AC |
3215 | if From_Limited_With (Typ) |
3216 | and then Has_Non_Limited_View (Typ) | |
3217 | and then not From_Limited_With (Scope (Typ)) | |
3218 | then | |
1e55d29a EB |
3219 | if No (Result) then |
3220 | Result := New_Elmt_List; | |
3221 | end if; | |
3222 | ||
3223 | Prepend_Elmt (Typ, Result); | |
3224 | Prepend_Elmt (Id, Result); | |
5dcab3ca AC |
3225 | Set_Etype (Id, Non_Limited_View (Typ)); |
3226 | end if; | |
3227 | end Detect_And_Exchange; | |
3228 | ||
3229 | -- Local variables | |
3230 | ||
3231 | Formal : Entity_Id; | |
3232 | ||
3233 | -- Start of processing for Exchange_Limited_Views | |
3234 | ||
3235 | begin | |
5dcab3ca AC |
3236 | -- Do not process subprogram bodies as they already use the non- |
3237 | -- limited view of types. | |
3238 | ||
128a98ea | 3239 | if not Ekind_In (Subp_Id, E_Function, E_Procedure) then |
1e55d29a | 3240 | return No_Elist; |
5dcab3ca AC |
3241 | end if; |
3242 | ||
3243 | -- Examine all formals and swap views when applicable | |
3244 | ||
3245 | Formal := First_Formal (Subp_Id); | |
3246 | while Present (Formal) loop | |
3247 | Detect_And_Exchange (Formal); | |
3248 | ||
3249 | Next_Formal (Formal); | |
3250 | end loop; | |
3251 | ||
3252 | -- Process the return type of a function | |
3253 | ||
3254 | if Ekind (Subp_Id) = E_Function then | |
3255 | Detect_And_Exchange (Subp_Id); | |
3256 | end if; | |
1e55d29a EB |
3257 | |
3258 | return Result; | |
5dcab3ca AC |
3259 | end Exchange_Limited_Views; |
3260 | ||
d44202ba HK |
3261 | ------------------------------------- |
3262 | -- Is_Private_Concurrent_Primitive -- | |
3263 | ------------------------------------- | |
3264 | ||
3265 | function Is_Private_Concurrent_Primitive | |
3266 | (Subp_Id : Entity_Id) return Boolean | |
3267 | is | |
3268 | Formal_Typ : Entity_Id; | |
3269 | ||
3270 | begin | |
3271 | if Present (First_Formal (Subp_Id)) then | |
3272 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
3273 | ||
3274 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
3275 | if Is_Class_Wide_Type (Formal_Typ) then |
3276 | Formal_Typ := Root_Type (Formal_Typ); | |
3277 | end if; | |
3278 | ||
d44202ba HK |
3279 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
3280 | end if; | |
3281 | ||
3282 | -- The type of the first formal is a concurrent tagged type with | |
3283 | -- a private view. | |
3284 | ||
3285 | return | |
3286 | Is_Concurrent_Type (Formal_Typ) | |
3287 | and then Is_Tagged_Type (Formal_Typ) | |
3288 | and then Has_Private_Declaration (Formal_Typ); | |
3289 | end if; | |
3290 | ||
3291 | return False; | |
3292 | end Is_Private_Concurrent_Primitive; | |
3293 | ||
a83d0680 AC |
3294 | ------------------------- |
3295 | -- Mask_Unfrozen_Types -- | |
3296 | ------------------------- | |
3297 | ||
3298 | function Mask_Unfrozen_Types (Spec_Id : Entity_Id) return Elist_Id is | |
3299 | Result : Elist_Id := No_Elist; | |
3300 | ||
3301 | function Mask_Type_Refs (Node : Node_Id) return Traverse_Result; | |
3302 | -- Mask all types referenced in the subtree rooted at Node | |
3303 | ||
3304 | -------------------- | |
3305 | -- Mask_Type_Refs -- | |
3306 | -------------------- | |
3307 | ||
3308 | function Mask_Type_Refs (Node : Node_Id) return Traverse_Result is | |
a83d0680 | 3309 | procedure Mask_Type (Typ : Entity_Id); |
d7cc5f0e | 3310 | -- ??? what does this do? |
a83d0680 AC |
3311 | |
3312 | --------------- | |
3313 | -- Mask_Type -- | |
3314 | --------------- | |
3315 | ||
3316 | procedure Mask_Type (Typ : Entity_Id) is | |
3317 | begin | |
3318 | -- Skip Itypes created by the preanalysis | |
3319 | ||
3320 | if Is_Itype (Typ) | |
3321 | and then Scope_Within_Or_Same (Scope (Typ), Spec_Id) | |
3322 | then | |
3323 | return; | |
3324 | end if; | |
3325 | ||
3326 | if not Is_Frozen (Typ) then | |
3327 | Set_Is_Frozen (Typ); | |
3328 | Append_New_Elmt (Typ, Result); | |
3329 | end if; | |
3330 | end Mask_Type; | |
3331 | ||
d7cc5f0e PMR |
3332 | -- Start of processing for Mask_Type_Refs |
3333 | ||
a83d0680 AC |
3334 | begin |
3335 | if Is_Entity_Name (Node) and then Present (Entity (Node)) then | |
3336 | Mask_Type (Etype (Entity (Node))); | |
3337 | ||
3338 | if Ekind_In (Entity (Node), E_Component, E_Discriminant) then | |
3339 | Mask_Type (Scope (Entity (Node))); | |
3340 | end if; | |
3341 | ||
3342 | elsif Nkind_In (Node, N_Aggregate, N_Null, N_Type_Conversion) | |
3343 | and then Present (Etype (Node)) | |
3344 | then | |
3345 | Mask_Type (Etype (Node)); | |
3346 | end if; | |
3347 | ||
3348 | return OK; | |
3349 | end Mask_Type_Refs; | |
3350 | ||
3351 | procedure Mask_References is new Traverse_Proc (Mask_Type_Refs); | |
3352 | ||
d7cc5f0e PMR |
3353 | -- Local variables |
3354 | ||
a83d0680 AC |
3355 | Return_Stmt : constant Node_Id := |
3356 | First (Statements (Handled_Statement_Sequence (N))); | |
d7cc5f0e PMR |
3357 | |
3358 | -- Start of processing for Mask_Unfrozen_Types | |
3359 | ||
a83d0680 AC |
3360 | begin |
3361 | pragma Assert (Nkind (Return_Stmt) = N_Simple_Return_Statement); | |
3362 | ||
3363 | Mask_References (Expression (Return_Stmt)); | |
3364 | ||
3365 | return Result; | |
3366 | end Mask_Unfrozen_Types; | |
3367 | ||
1e55d29a EB |
3368 | --------------------------- |
3369 | -- Restore_Limited_Views -- | |
3370 | --------------------------- | |
3371 | ||
3372 | procedure Restore_Limited_Views (Restore_List : Elist_Id) is | |
3373 | Elmt : Elmt_Id := First_Elmt (Restore_List); | |
3374 | Id : Entity_Id; | |
3375 | ||
3376 | begin | |
3377 | while Present (Elmt) loop | |
3378 | Id := Node (Elmt); | |
3379 | Next_Elmt (Elmt); | |
3380 | Set_Etype (Id, Node (Elmt)); | |
3381 | Next_Elmt (Elmt); | |
3382 | end loop; | |
3383 | end Restore_Limited_Views; | |
3384 | ||
76a69663 ES |
3385 | ---------------------------- |
3386 | -- Set_Trivial_Subprogram -- | |
3387 | ---------------------------- | |
3388 | ||
3389 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
3390 | Nxt : constant Node_Id := Next (N); | |
3391 | ||
3392 | begin | |
3393 | Set_Is_Trivial_Subprogram (Body_Id); | |
3394 | ||
3395 | if Present (Spec_Id) then | |
3396 | Set_Is_Trivial_Subprogram (Spec_Id); | |
3397 | end if; | |
3398 | ||
3399 | if Present (Nxt) | |
3400 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
3401 | and then No (Next (Nxt)) | |
3402 | and then Present (Expression (Nxt)) | |
3403 | and then Is_Entity_Name (Expression (Nxt)) | |
3404 | then | |
3405 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
3406 | end if; | |
3407 | end Set_Trivial_Subprogram; | |
3408 | ||
a83d0680 AC |
3409 | --------------------------- |
3410 | -- Unmask_Unfrozen_Types -- | |
3411 | --------------------------- | |
3412 | ||
3413 | procedure Unmask_Unfrozen_Types (Unmask_List : Elist_Id) is | |
3414 | Elmt : Elmt_Id := First_Elmt (Unmask_List); | |
3415 | ||
3416 | begin | |
3417 | while Present (Elmt) loop | |
3418 | Set_Is_Frozen (Node (Elmt), False); | |
3419 | Next_Elmt (Elmt); | |
3420 | end loop; | |
3421 | end Unmask_Unfrozen_Types; | |
3422 | ||
758c442c GD |
3423 | --------------------------------- |
3424 | -- Verify_Overriding_Indicator -- | |
3425 | --------------------------------- | |
3426 | ||
3427 | procedure Verify_Overriding_Indicator is | |
3428 | begin | |
21d27997 RD |
3429 | if Must_Override (Body_Spec) then |
3430 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
4b6f99f5 | 3431 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 RD |
3432 | then |
3433 | null; | |
3434 | ||
038140ed | 3435 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 3436 | Error_Msg_NE |
21d27997 | 3437 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
23e28b42 AC |
3438 | |
3439 | -- Overriding indicators aren't allowed for protected subprogram | |
3440 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
3441 | -- this to a warning if -gnatd.E is enabled. | |
3442 | ||
3443 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
3444 | Error_Msg_Warn := Error_To_Warning; | |
3445 | Error_Msg_N | |
b785e0b8 | 3446 | ("<<overriding indicator not allowed for protected " |
23e28b42 | 3447 | & "subprogram body", Body_Spec); |
21d27997 | 3448 | end if; |
758c442c | 3449 | |
5d37ba92 | 3450 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 3451 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 3452 | Error_Msg_NE |
5d37ba92 | 3453 | ("subprogram& overrides inherited operation", |
76a69663 | 3454 | Body_Spec, Spec_Id); |
5d37ba92 | 3455 | |
21d27997 | 3456 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
4b6f99f5 | 3457 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 | 3458 | then |
ed2233dc | 3459 | Error_Msg_NE |
3ccedacc | 3460 | ("subprogram& overrides predefined operator ", |
21d27997 RD |
3461 | Body_Spec, Spec_Id); |
3462 | ||
23e28b42 AC |
3463 | -- Overriding indicators aren't allowed for protected subprogram |
3464 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
3465 | -- this to a warning if -gnatd.E is enabled. | |
3466 | ||
3467 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
3468 | Error_Msg_Warn := Error_To_Warning; | |
5d37ba92 | 3469 | |
23e28b42 | 3470 | Error_Msg_N |
3ccedacc AC |
3471 | ("<<overriding indicator not allowed " |
3472 | & "for protected subprogram body", Body_Spec); | |
23e28b42 AC |
3473 | |
3474 | -- If this is not a primitive operation, then the overriding | |
3475 | -- indicator is altogether illegal. | |
3476 | ||
3477 | elsif not Is_Primitive (Spec_Id) then | |
ed2233dc | 3478 | Error_Msg_N |
3ccedacc AC |
3479 | ("overriding indicator only allowed " |
3480 | & "if subprogram is primitive", Body_Spec); | |
5d37ba92 | 3481 | end if; |
235f4375 | 3482 | |
23e28b42 AC |
3483 | -- If checking the style rule and the operation overrides, then |
3484 | -- issue a warning about a missing overriding_indicator. Protected | |
3485 | -- subprogram bodies are excluded from this style checking, since | |
3486 | -- they aren't primitives (even though their declarations can | |
3487 | -- override) and aren't allowed to have an overriding_indicator. | |
3488 | ||
806f6d37 | 3489 | elsif Style_Check |
038140ed | 3490 | and then Present (Overridden_Operation (Spec_Id)) |
23e28b42 | 3491 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type |
235f4375 AC |
3492 | then |
3493 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3494 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
3495 | |
3496 | elsif Style_Check | |
3497 | and then Can_Override_Operator (Spec_Id) | |
8ab31c0c | 3498 | and then not In_Predefined_Unit (Spec_Id) |
806f6d37 AC |
3499 | then |
3500 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3501 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
3502 | end if; |
3503 | end Verify_Overriding_Indicator; | |
3504 | ||
1af4455a HK |
3505 | -- Local variables |
3506 | ||
f9a8f910 HK |
3507 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
3508 | Saved_ISMP : constant Boolean := | |
3509 | Ignore_SPARK_Mode_Pragmas_In_Instance; | |
3510 | -- Save the Ghost and SPARK mode-related data to restore on exit | |
1af4455a | 3511 | |
b1b543d2 | 3512 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 3513 | |
996ae0b0 | 3514 | begin |
65e5747e | 3515 | -- A [generic] subprogram body freezes the contract of the nearest |
e645cb39 | 3516 | -- enclosing package body and all other contracts encountered in the |
4404c282 | 3517 | -- same declarative part up to and excluding the subprogram body: |
879ac954 AC |
3518 | |
3519 | -- package body Nearest_Enclosing_Package | |
3520 | -- with Refined_State => (State => Constit) | |
3521 | -- is | |
3522 | -- Constit : ...; | |
3523 | ||
3524 | -- procedure Freezes_Enclosing_Package_Body | |
3525 | -- with Refined_Depends => (Input => Constit) ... | |
3526 | ||
3527 | -- This ensures that any annotations referenced by the contract of the | |
65e5747e | 3528 | -- [generic] subprogram body are available. This form of freezing is |
879ac954 AC |
3529 | -- decoupled from the usual Freeze_xxx mechanism because it must also |
3530 | -- work in the context of generics where normal freezing is disabled. | |
3531 | ||
65e5747e | 3532 | -- Only bodies coming from source should cause this type of freezing. |
77237288 AC |
3533 | -- Expression functions that act as bodies and complete an initial |
3534 | -- declaration must be included in this category, hence the use of | |
3535 | -- Original_Node. | |
3536 | ||
3537 | if Comes_From_Source (Original_Node (N)) then | |
65e5747e | 3538 | Freeze_Previous_Contracts (N); |
77237288 | 3539 | end if; |
879ac954 | 3540 | |
82c80734 RD |
3541 | -- Generic subprograms are handled separately. They always have a |
3542 | -- generic specification. Determine whether current scope has a | |
3543 | -- previous declaration. | |
996ae0b0 | 3544 | |
82c80734 RD |
3545 | -- If the subprogram body is defined within an instance of the same |
3546 | -- name, the instance appears as a package renaming, and will be hidden | |
3547 | -- within the subprogram. | |
996ae0b0 RK |
3548 | |
3549 | if Present (Prev_Id) | |
3550 | and then not Is_Overloadable (Prev_Id) | |
3551 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
3552 | or else Comes_From_Source (Prev_Id)) | |
3553 | then | |
fbf5a39b | 3554 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 | 3555 | Spec_Id := Prev_Id; |
8636f52f | 3556 | |
1af4455a HK |
3557 | -- A subprogram body is Ghost when it is stand alone and subject |
3558 | -- to pragma Ghost or when the corresponding spec is Ghost. Set | |
3559 | -- the mode now to ensure that any nodes generated during analysis | |
3560 | -- and expansion are properly marked as Ghost. | |
8636f52f | 3561 | |
f9a8f910 | 3562 | Mark_And_Set_Ghost_Body (N, Spec_Id); |
d65a80fd | 3563 | |
7255f3c3 HK |
3564 | -- If the body completes the initial declaration of a compilation |
3565 | -- unit which is subject to pragma Elaboration_Checks, set the | |
3566 | -- model specified by the pragma because it applies to all parts | |
3567 | -- of the unit. | |
3568 | ||
3569 | Install_Elaboration_Model (Spec_Id); | |
3570 | ||
996ae0b0 RK |
3571 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); |
3572 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3573 | ||
3574 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
3575 | |
3576 | if Nkind (N) = N_Subprogram_Body then | |
3577 | HSS := Handled_Statement_Sequence (N); | |
3578 | Check_Missing_Return; | |
3579 | end if; | |
3580 | ||
d65a80fd | 3581 | goto Leave; |
996ae0b0 | 3582 | |
d65a80fd HK |
3583 | -- Otherwise a previous entity conflicts with the subprogram name. |
3584 | -- Attempting to enter name will post error. | |
996ae0b0 | 3585 | |
d65a80fd | 3586 | else |
996ae0b0 | 3587 | Enter_Name (Body_Id); |
cf9a473e | 3588 | goto Leave; |
996ae0b0 RK |
3589 | end if; |
3590 | ||
82c80734 RD |
3591 | -- Non-generic case, find the subprogram declaration, if one was seen, |
3592 | -- or enter new overloaded entity in the current scope. If the | |
3593 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
3594 | -- part of the context of one of its subunits. No need to redo the | |
3595 | -- analysis. | |
996ae0b0 | 3596 | |
8fde064e | 3597 | elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
cf9a473e | 3598 | goto Leave; |
996ae0b0 RK |
3599 | |
3600 | else | |
fbf5a39b | 3601 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
3602 | |
3603 | if Nkind (N) = N_Subprogram_Body_Stub | |
3604 | or else No (Corresponding_Spec (N)) | |
3605 | then | |
d44202ba HK |
3606 | if Is_Private_Concurrent_Primitive (Body_Id) then |
3607 | Spec_Id := Disambiguate_Spec; | |
8636f52f | 3608 | |
1af4455a HK |
3609 | -- A subprogram body is Ghost when it is stand alone and |
3610 | -- subject to pragma Ghost or when the corresponding spec is | |
3611 | -- Ghost. Set the mode now to ensure that any nodes generated | |
3612 | -- during analysis and expansion are properly marked as Ghost. | |
8636f52f | 3613 | |
f9a8f910 | 3614 | Mark_And_Set_Ghost_Body (N, Spec_Id); |
8636f52f | 3615 | |
7255f3c3 HK |
3616 | -- If the body completes a compilation unit which is subject |
3617 | -- to pragma Elaboration_Checks, set the model specified by | |
3618 | -- the pragma because it applies to all parts of the unit. | |
3619 | ||
3620 | Install_Elaboration_Model (Spec_Id); | |
3621 | ||
d44202ba HK |
3622 | else |
3623 | Spec_Id := Find_Corresponding_Spec (N); | |
b6c8e5be | 3624 | |
1af4455a HK |
3625 | -- A subprogram body is Ghost when it is stand alone and |
3626 | -- subject to pragma Ghost or when the corresponding spec is | |
3627 | -- Ghost. Set the mode now to ensure that any nodes generated | |
3628 | -- during analysis and expansion are properly marked as Ghost. | |
8636f52f | 3629 | |
f9a8f910 | 3630 | Mark_And_Set_Ghost_Body (N, Spec_Id); |
8636f52f | 3631 | |
7255f3c3 HK |
3632 | -- If the body completes a compilation unit which is subject |
3633 | -- to pragma Elaboration_Checks, set the model specified by | |
3634 | -- the pragma because it applies to all parts of the unit. | |
3635 | ||
3636 | Install_Elaboration_Model (Spec_Id); | |
3637 | ||
b6c8e5be AC |
3638 | -- In GNATprove mode, if the body has no previous spec, create |
3639 | -- one so that the inlining machinery can operate properly. | |
3640 | -- Transfer aspects, if any, to the new spec, so that they | |
3641 | -- are legal and can be processed ahead of the body. | |
3642 | -- We make two copies of the given spec, one for the new | |
3643 | -- declaration, and one for the body. | |
3644 | ||
5a271a7f | 3645 | if No (Spec_Id) and then GNATprove_Mode |
480156b2 | 3646 | |
480156b2 AC |
3647 | -- Inlining does not apply during pre-analysis of code |
3648 | ||
b6c8e5be | 3649 | and then Full_Analysis |
480156b2 AC |
3650 | |
3651 | -- Inlining only applies to full bodies, not stubs | |
3652 | ||
7b2888e6 | 3653 | and then Nkind (N) /= N_Subprogram_Body_Stub |
480156b2 AC |
3654 | |
3655 | -- Inlining only applies to bodies in the source code, not to | |
3656 | -- those generated by the compiler. In particular, expression | |
3657 | -- functions, whose body is generated by the compiler, are | |
3658 | -- treated specially by GNATprove. | |
3659 | ||
b6c8e5be | 3660 | and then Comes_From_Source (Body_Id) |
480156b2 AC |
3661 | |
3662 | -- This cannot be done for a compilation unit, which is not | |
3663 | -- in a context where we can insert a new spec. | |
3664 | ||
b6c8e5be | 3665 | and then Is_List_Member (N) |
480156b2 AC |
3666 | |
3667 | -- Inlining only applies to subprograms without contracts, | |
3668 | -- as a contract is a sign that GNATprove should perform a | |
3669 | -- modular analysis of the subprogram instead of a contextual | |
3670 | -- analysis at each call site. The same test is performed in | |
3671 | -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated | |
ca90b962 GD |
3672 | -- here in another form (because the contract has not been |
3673 | -- attached to the body) to avoid front-end errors in case | |
3674 | -- pragmas are used instead of aspects, because the | |
480156b2 AC |
3675 | -- corresponding pragmas in the body would not be transferred |
3676 | -- to the spec, leading to legality errors. | |
3677 | ||
ac072cb2 | 3678 | and then not Body_Has_Contract |
8d1fe980 | 3679 | and then not Inside_A_Generic |
b6c8e5be | 3680 | then |
8d1fe980 | 3681 | Build_Subprogram_Declaration; |
2ba4f1fb AC |
3682 | |
3683 | -- If this is a function that returns a constrained array, and | |
3684 | -- we are generating SPARK_For_C, create subprogram declaration | |
3685 | -- to simplify subsequent C generation. | |
3686 | ||
3687 | elsif No (Spec_Id) | |
3688 | and then Modify_Tree_For_C | |
3689 | and then Nkind (Body_Spec) = N_Function_Specification | |
3690 | and then Is_Array_Type (Etype (Body_Id)) | |
3691 | and then Is_Constrained (Etype (Body_Id)) | |
3692 | then | |
3693 | Build_Subprogram_Declaration; | |
b6c8e5be | 3694 | end if; |
d44202ba | 3695 | end if; |
996ae0b0 RK |
3696 | |
3697 | -- If this is a duplicate body, no point in analyzing it | |
3698 | ||
3699 | if Error_Posted (N) then | |
d65a80fd | 3700 | goto Leave; |
996ae0b0 RK |
3701 | end if; |
3702 | ||
82c80734 RD |
3703 | -- A subprogram body should cause freezing of its own declaration, |
3704 | -- but if there was no previous explicit declaration, then the | |
3705 | -- subprogram will get frozen too late (there may be code within | |
3706 | -- the body that depends on the subprogram having been frozen, | |
3707 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 3708 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
3709 | -- Finally, if the return type is an anonymous access to protected |
3710 | -- subprogram, it must be frozen before the body because its | |
3711 | -- expansion has generated an equivalent type that is used when | |
3712 | -- elaborating the body. | |
996ae0b0 | 3713 | |
885c4871 | 3714 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
3715 | -- created for expression functions do not freeze. |
3716 | ||
3717 | if No (Spec_Id) | |
3718 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
3719 | then | |
996ae0b0 RK |
3720 | Freeze_Before (N, Body_Id); |
3721 | ||
3722 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
3723 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
3724 | |
3725 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
3726 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 3727 | end if; |
a38ff9b1 | 3728 | |
996ae0b0 RK |
3729 | else |
3730 | Spec_Id := Corresponding_Spec (N); | |
8636f52f | 3731 | |
1af4455a HK |
3732 | -- A subprogram body is Ghost when it is stand alone and subject |
3733 | -- to pragma Ghost or when the corresponding spec is Ghost. Set | |
3734 | -- the mode now to ensure that any nodes generated during analysis | |
3735 | -- and expansion are properly marked as Ghost. | |
8636f52f | 3736 | |
f9a8f910 | 3737 | Mark_And_Set_Ghost_Body (N, Spec_Id); |
7255f3c3 HK |
3738 | |
3739 | -- If the body completes the initial declaration of a compilation | |
3740 | -- unit which is subject to pragma Elaboration_Checks, set the | |
3741 | -- model specified by the pragma because it applies to all parts | |
3742 | -- of the unit. | |
3743 | ||
3744 | Install_Elaboration_Model (Spec_Id); | |
996ae0b0 RK |
3745 | end if; |
3746 | end if; | |
3747 | ||
799d0e05 AC |
3748 | -- Previously we scanned the body to look for nested subprograms, and |
3749 | -- rejected an inline directive if nested subprograms were present, | |
3750 | -- because the back-end would generate conflicting symbols for the | |
c8957aae | 3751 | -- nested bodies. This is now unnecessary. |
07fc65c4 | 3752 | |
c8957aae | 3753 | -- Look ahead to recognize a pragma Inline that appears after the body |
84f4072a | 3754 | |
e660dbf7 JM |
3755 | Check_Inline_Pragma (Spec_Id); |
3756 | ||
701b7fbb RD |
3757 | -- Deal with special case of a fully private operation in the body of |
3758 | -- the protected type. We must create a declaration for the subprogram, | |
3759 | -- in order to attach the protected subprogram that will be used in | |
3760 | -- internal calls. We exclude compiler generated bodies from the | |
3761 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 3762 | |
996ae0b0 RK |
3763 | if No (Spec_Id) |
3764 | and then Comes_From_Source (N) | |
3765 | and then Is_Protected_Type (Current_Scope) | |
3766 | then | |
47bfea3a | 3767 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 3768 | end if; |
996ae0b0 | 3769 | |
c42aba6b AC |
3770 | -- If we are generating C and this is a function returning a constrained |
3771 | -- array type for which we must create a procedure with an extra out | |
c4dc2125 | 3772 | -- parameter, build and analyze the body now. The procedure declaration |
c42aba6b AC |
3773 | -- has already been created. We reuse the source body of the function, |
3774 | -- because in an instance it may contain global references that cannot | |
3775 | -- be reanalyzed. The source function itself is not used any further, | |
2a253c5b AC |
3776 | -- so we mark it as having a completion. If the subprogram is a stub the |
3777 | -- transformation is done later, when the proper body is analyzed. | |
c42aba6b AC |
3778 | |
3779 | if Expander_Active | |
3780 | and then Modify_Tree_For_C | |
3781 | and then Present (Spec_Id) | |
3782 | and then Ekind (Spec_Id) = E_Function | |
2a253c5b | 3783 | and then Nkind (N) /= N_Subprogram_Body_Stub |
c42aba6b AC |
3784 | and then Rewritten_For_C (Spec_Id) |
3785 | then | |
3786 | Set_Has_Completion (Spec_Id); | |
3787 | ||
3788 | Rewrite (N, Build_Procedure_Body_Form (Spec_Id, N)); | |
3789 | Analyze (N); | |
3790 | ||
c4dc2125 HK |
3791 | -- The entity for the created procedure must remain invisible, so it |
3792 | -- does not participate in resolution of subsequent references to the | |
3793 | -- function. | |
c42aba6b AC |
3794 | |
3795 | Set_Is_Immediately_Visible (Corresponding_Spec (N), False); | |
d65a80fd | 3796 | goto Leave; |
c42aba6b AC |
3797 | end if; |
3798 | ||
5334d18f | 3799 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 3800 | |
701b7fbb | 3801 | if Present (Spec_Id) then |
996ae0b0 | 3802 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 3803 | Verify_Overriding_Indicator; |
5d37ba92 ES |
3804 | |
3805 | -- In general, the spec will be frozen when we start analyzing the | |
3806 | -- body. However, for internally generated operations, such as | |
3807 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
3808 | -- results, the spec may not have been frozen by the time we expand |
3809 | -- the freeze actions that include the bodies. In particular, extra | |
3810 | -- formals for accessibility or for return-in-place may need to be | |
3811 | -- generated. Freeze nodes, if any, are inserted before the current | |
36f2e3d3 AC |
3812 | -- body. These freeze actions are also needed in ASIS mode and in |
3813 | -- Compile_Only mode to enable the proper back-end type annotations. | |
3814 | -- They are necessary in any case to insure order of elaboration | |
3815 | -- in gigi. | |
5d37ba92 ES |
3816 | |
3817 | if not Is_Frozen (Spec_Id) | |
36f2e3d3 | 3818 | and then (Expander_Active |
d7cc5f0e PMR |
3819 | or else ASIS_Mode |
3820 | or else (Operating_Mode = Check_Semantics | |
3821 | and then Serious_Errors_Detected = 0)) | |
5d37ba92 | 3822 | then |
a83d0680 AC |
3823 | -- The body generated for an expression function that is not a |
3824 | -- completion is a freeze point neither for the profile nor for | |
3825 | -- anything else. That's why, in order to prevent any freezing | |
3826 | -- during analysis, we need to mask types declared outside the | |
3827 | -- expression that are not yet frozen. | |
3828 | ||
3829 | if Nkind (N) = N_Subprogram_Body | |
3830 | and then Was_Expression_Function (N) | |
3831 | and then not Has_Completion (Spec_Id) | |
3832 | then | |
3833 | Set_Is_Frozen (Spec_Id); | |
3834 | Mask_Types := Mask_Unfrozen_Types (Spec_Id); | |
3835 | else | |
3836 | Set_Has_Delayed_Freeze (Spec_Id); | |
3837 | Freeze_Before (N, Spec_Id); | |
3838 | end if; | |
5d37ba92 | 3839 | end if; |
996ae0b0 RK |
3840 | end if; |
3841 | ||
aaa0a838 ES |
3842 | -- If the subprogram has a class-wide clone, build its body as a copy |
3843 | -- of the original body, and rewrite body of original subprogram as a | |
3844 | -- wrapper that calls the clone. | |
3845 | ||
3846 | if Present (Spec_Id) | |
3847 | and then Present (Class_Wide_Clone (Spec_Id)) | |
3848 | and then (Comes_From_Source (N) or else Was_Expression_Function (N)) | |
3849 | then | |
3850 | Build_Class_Wide_Clone_Body (Spec_Id, N); | |
3851 | ||
3852 | -- This is the new body for the existing primitive operation | |
3853 | ||
3854 | Rewrite (N, Build_Class_Wide_Clone_Call | |
3855 | (Sloc (N), New_List, Spec_Id, Parent (Spec_Id))); | |
3856 | Set_Has_Completion (Spec_Id, False); | |
3857 | Analyze (N); | |
3858 | return; | |
3859 | end if; | |
3860 | ||
996ae0b0 RK |
3861 | -- Place subprogram on scope stack, and make formals visible. If there |
3862 | -- is a spec, the visible entity remains that of the spec. | |
3863 | ||
3864 | if Present (Spec_Id) then | |
07fc65c4 | 3865 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
3866 | |
3867 | if Is_Child_Unit (Spec_Id) then | |
3868 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
3869 | end if; | |
3870 | ||
fbf5a39b AC |
3871 | if Style_Check then |
3872 | Style.Check_Identifier (Body_Id, Spec_Id); | |
3873 | end if; | |
996ae0b0 RK |
3874 | |
3875 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
3876 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3877 | ||
f937473f | 3878 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 3879 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
d65a80fd | 3880 | goto Leave; |
21d27997 | 3881 | |
996ae0b0 RK |
3882 | else |
3883 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
3884 | Set_Has_Completion (Spec_Id); | |
3885 | ||
3886 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 3887 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
3888 | end if; |
3889 | ||
3890 | -- If this is a body generated for a renaming, do not check for | |
3891 | -- full conformance. The check is redundant, because the spec of | |
3892 | -- the body is a copy of the spec in the renaming declaration, | |
3893 | -- and the test can lead to spurious errors on nested defaults. | |
3894 | ||
3895 | if Present (Spec_Decl) | |
996ae0b0 | 3896 | and then not Comes_From_Source (N) |
93a81b02 GB |
3897 | and then |
3898 | (Nkind (Original_Node (Spec_Decl)) = | |
4b6f99f5 | 3899 | N_Subprogram_Renaming_Declaration |
466c2127 AC |
3900 | or else (Present (Corresponding_Body (Spec_Decl)) |
3901 | and then | |
3902 | Nkind (Unit_Declaration_Node | |
3903 | (Corresponding_Body (Spec_Decl))) = | |
3904 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
3905 | then |
3906 | Conformant := True; | |
cabe9abc AC |
3907 | |
3908 | -- Conversely, the spec may have been generated for specless body | |
a6363ed3 AC |
3909 | -- with an inline pragma. The entity comes from source, which is |
3910 | -- both semantically correct and necessary for proper inlining. | |
3911 | -- The subprogram declaration itself is not in the source. | |
cabe9abc AC |
3912 | |
3913 | elsif Comes_From_Source (N) | |
a6363ed3 AC |
3914 | and then Present (Spec_Decl) |
3915 | and then not Comes_From_Source (Spec_Decl) | |
cabe9abc AC |
3916 | and then Has_Pragma_Inline (Spec_Id) |
3917 | then | |
3918 | Conformant := True; | |
76a69663 | 3919 | |
996ae0b0 RK |
3920 | else |
3921 | Check_Conformance | |
3922 | (Body_Id, Spec_Id, | |
76a69663 | 3923 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
3924 | end if; |
3925 | ||
3926 | -- If the body is not fully conformant, we have to decide if we | |
3927 | -- should analyze it or not. If it has a really messed up profile | |
3928 | -- then we probably should not analyze it, since we will get too | |
3929 | -- many bogus messages. | |
3930 | ||
3931 | -- Our decision is to go ahead in the non-fully conformant case | |
3932 | -- only if it is at least mode conformant with the spec. Note | |
3933 | -- that the call to Check_Fully_Conformant has issued the proper | |
3934 | -- error messages to complain about the lack of conformance. | |
3935 | ||
3936 | if not Conformant | |
3937 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
3938 | then | |
d65a80fd | 3939 | goto Leave; |
996ae0b0 RK |
3940 | end if; |
3941 | end if; | |
3942 | ||
3f89eb7f JS |
3943 | -- In the case we are dealing with an expression function we check |
3944 | -- the formals attached to the spec instead of the body - so we don't | |
3945 | -- reference body formals. | |
3946 | ||
3947 | if Spec_Id /= Body_Id | |
3948 | and then not Is_Expression_Function (Spec_Id) | |
3949 | then | |
fbf5a39b | 3950 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
3951 | end if; |
3952 | ||
579847c2 AC |
3953 | Set_Ekind (Body_Id, E_Subprogram_Body); |
3954 | ||
e28072cd AC |
3955 | if Nkind (N) = N_Subprogram_Body_Stub then |
3956 | Set_Corresponding_Spec_Of_Stub (N, Spec_Id); | |
3957 | ||
3958 | -- Regular body | |
3959 | ||
3960 | else | |
996ae0b0 | 3961 | Set_Corresponding_Spec (N, Spec_Id); |
758c442c | 3962 | |
5d37ba92 ES |
3963 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
3964 | -- of a concurrent type, the type of the first parameter has been | |
3965 | -- replaced with the corresponding record, which is the proper | |
3966 | -- run-time structure to use. However, within the body there may | |
3967 | -- be uses of the formals that depend on primitive operations | |
3968 | -- of the type (in particular calls in prefixed form) for which | |
3969 | -- we need the original concurrent type. The operation may have | |
3970 | -- several controlling formals, so the replacement must be done | |
3971 | -- for all of them. | |
758c442c GD |
3972 | |
3973 | if Comes_From_Source (Spec_Id) | |
3974 | and then Present (First_Entity (Spec_Id)) | |
3975 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
3976 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
15918371 AC |
3977 | and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
3978 | and then Present (Corresponding_Concurrent_Type | |
3979 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 3980 | then |
5d37ba92 ES |
3981 | declare |
3982 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
3983 | Form : Entity_Id; | |
3984 | ||
3985 | begin | |
3986 | Form := First_Formal (Spec_Id); | |
3987 | while Present (Form) loop | |
3988 | if Etype (Form) = Typ then | |
3989 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
3990 | end if; | |
3991 | ||
3992 | Next_Formal (Form); | |
3993 | end loop; | |
3994 | end; | |
758c442c GD |
3995 | end if; |
3996 | ||
21d27997 RD |
3997 | -- Make the formals visible, and place subprogram on scope stack. |
3998 | -- This is also the point at which we set Last_Real_Spec_Entity | |
3999 | -- to mark the entities which will not be moved to the body. | |
758c442c | 4000 | |
996ae0b0 | 4001 | Install_Formals (Spec_Id); |
21d27997 | 4002 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
616547fa AC |
4003 | |
4004 | -- Within an instance, add local renaming declarations so that | |
a5a809b2 AC |
4005 | -- gdb can retrieve the values of actuals more easily. This is |
4006 | -- only relevant if generating code (and indeed we definitely | |
4007 | -- do not want these definitions -gnatc mode, because that would | |
4008 | -- confuse ASIS). | |
616547fa AC |
4009 | |
4010 | if Is_Generic_Instance (Spec_Id) | |
4011 | and then Is_Wrapper_Package (Current_Scope) | |
a5a809b2 | 4012 | and then Expander_Active |
616547fa AC |
4013 | then |
4014 | Build_Subprogram_Instance_Renamings (N, Current_Scope); | |
4015 | end if; | |
4016 | ||
0a36105d | 4017 | Push_Scope (Spec_Id); |
996ae0b0 RK |
4018 | |
4019 | -- Make sure that the subprogram is immediately visible. For | |
4020 | -- child units that have no separate spec this is indispensable. | |
4021 | -- Otherwise it is safe albeit redundant. | |
4022 | ||
4023 | Set_Is_Immediately_Visible (Spec_Id); | |
4024 | end if; | |
4025 | ||
4026 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
ec4867fa | 4027 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
c9d70ab1 | 4028 | Set_Scope (Body_Id, Scope (Spec_Id)); |
996ae0b0 RK |
4029 | |
4030 | -- Case of subprogram body with no previous spec | |
4031 | ||
4032 | else | |
3e5daac4 AC |
4033 | -- Check for style warning required |
4034 | ||
996ae0b0 | 4035 | if Style_Check |
3e5daac4 AC |
4036 | |
4037 | -- Only apply check for source level subprograms for which checks | |
4038 | -- have not been suppressed. | |
4039 | ||
996ae0b0 RK |
4040 | and then Comes_From_Source (Body_Id) |
4041 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
4042 | |
4043 | -- No warnings within an instance | |
4044 | ||
996ae0b0 | 4045 | and then not In_Instance |
3e5daac4 | 4046 | |
b0186f71 | 4047 | -- No warnings for expression functions |
3e5daac4 | 4048 | |
b0186f71 | 4049 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
4050 | then |
4051 | Style.Body_With_No_Spec (N); | |
4052 | end if; | |
4053 | ||
4054 | New_Overloaded_Entity (Body_Id); | |
4055 | ||
4056 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
4057 | Set_Acts_As_Spec (N); | |
4058 | Generate_Definition (Body_Id); | |
fbf5a39b AC |
4059 | Generate_Reference |
4060 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
5e127570 AC |
4061 | |
4062 | -- If the body is an entry wrapper created for an entry with | |
ffa168bc | 4063 | -- preconditions, it must be compiled in the context of the |
5e127570 AC |
4064 | -- enclosing synchronized object, because it may mention other |
4065 | -- operations of the type. | |
4066 | ||
4067 | if Is_Entry_Wrapper (Body_Id) then | |
4068 | declare | |
4069 | Prot : constant Entity_Id := Etype (First_Entity (Body_Id)); | |
4070 | begin | |
4071 | Push_Scope (Prot); | |
4072 | Install_Declarations (Prot); | |
4073 | end; | |
4074 | end if; | |
4075 | ||
996ae0b0 | 4076 | Install_Formals (Body_Id); |
e949ee22 | 4077 | |
4a854847 | 4078 | Push_Scope (Body_Id); |
996ae0b0 | 4079 | end if; |
dbe36d67 AC |
4080 | |
4081 | -- For stubs and bodies with no previous spec, generate references to | |
4082 | -- formals. | |
4083 | ||
4084 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
4085 | end if; |
4086 | ||
2bfad6eb HK |
4087 | -- Entry barrier functions are generated outside the protected type and |
4088 | -- should not carry the SPARK_Mode of the enclosing context. | |
5216b599 | 4089 | |
877a5a12 AC |
4090 | if Nkind (N) = N_Subprogram_Body |
4091 | and then Is_Entry_Barrier_Function (N) | |
4092 | then | |
4093 | null; | |
2bfad6eb HK |
4094 | |
4095 | -- The body is generated as part of expression function expansion. When | |
4096 | -- the expression function appears in the visible declarations of a | |
4097 | -- package, the body is added to the private declarations. Since both | |
4098 | -- declarative lists may be subject to a different SPARK_Mode, inherit | |
4099 | -- the mode of the spec. | |
4100 | ||
4101 | -- package P with SPARK_Mode is | |
4102 | -- function Expr_Func ... is (...); -- original | |
4103 | -- [function Expr_Func ...;] -- generated spec | |
4104 | -- -- mode is ON | |
4105 | -- private | |
4106 | -- pragma SPARK_Mode (Off); | |
4107 | -- [function Expr_Func ... is return ...;] -- generated body | |
4108 | -- end P; -- mode is ON | |
4109 | ||
4110 | elsif not Comes_From_Source (N) | |
6e9e35e1 AC |
4111 | and then Present (Spec_Id) |
4112 | and then Is_Expression_Function (Spec_Id) | |
2bfad6eb | 4113 | then |
6e9e35e1 | 4114 | Set_SPARK_Pragma (Body_Id, SPARK_Pragma (Spec_Id)); |
2bfad6eb | 4115 | Set_SPARK_Pragma_Inherited |
6e9e35e1 | 4116 | (Body_Id, SPARK_Pragma_Inherited (Spec_Id)); |
2bfad6eb HK |
4117 | |
4118 | -- Set the SPARK_Mode from the current context (may be overwritten later | |
3f8c04e7 | 4119 | -- with explicit pragma). Exclude the case where the SPARK_Mode appears |
7f54dc83 | 4120 | -- initially on a stand-alone subprogram body, but is then relocated to |
3f8c04e7 AC |
4121 | -- a generated corresponding spec. In this scenario the mode is shared |
4122 | -- between the spec and body. | |
2bfad6eb | 4123 | |
3f8c04e7 | 4124 | elsif No (SPARK_Pragma (Body_Id)) then |
90e491a7 | 4125 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
877a5a12 AC |
4126 | Set_SPARK_Pragma_Inherited (Body_Id); |
4127 | end if; | |
5216b599 | 4128 | |
cf9a473e AC |
4129 | -- A subprogram body may be instantiated or inlined at a later pass. |
4130 | -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when it | |
4131 | -- applied to the initial declaration of the body. | |
4132 | ||
4133 | if Present (Spec_Id) then | |
4134 | if Ignore_SPARK_Mode_Pragmas (Spec_Id) then | |
4135 | Ignore_SPARK_Mode_Pragmas_In_Instance := True; | |
4136 | end if; | |
4137 | ||
4138 | else | |
4139 | -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in | |
4140 | -- case the body is instantiated or inlined later and out of context. | |
4141 | -- The body uses this attribute to restore the value of the global | |
4142 | -- flag. | |
4143 | ||
4144 | if Ignore_SPARK_Mode_Pragmas_In_Instance then | |
4145 | Set_Ignore_SPARK_Mode_Pragmas (Body_Id); | |
4146 | ||
4147 | elsif Ignore_SPARK_Mode_Pragmas (Body_Id) then | |
4148 | Ignore_SPARK_Mode_Pragmas_In_Instance := True; | |
4149 | end if; | |
4150 | end if; | |
4151 | ||
162ed06f HK |
4152 | -- Preserve relevant elaboration-related attributes of the context which |
4153 | -- are no longer available or very expensive to recompute once analysis, | |
4154 | -- resolution, and expansion are over. | |
4155 | ||
4156 | if No (Spec_Id) then | |
4157 | Mark_Elaboration_Attributes | |
4158 | (N_Id => Body_Id, | |
4159 | Checks => True, | |
4160 | Warnings => True); | |
4161 | end if; | |
4162 | ||
996ae0b0 RK |
4163 | -- If this is the proper body of a stub, we must verify that the stub |
4164 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 4165 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
4166 | -- only required for subprograms that come from source. |
4167 | ||
4168 | if Nkind (Parent (N)) = N_Subunit | |
4169 | and then Comes_From_Source (N) | |
4170 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
4171 | and then Nkind (Corresponding_Stub (Parent (N))) = |
4172 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
4173 | then |
4174 | declare | |
fbf5a39b AC |
4175 | Old_Id : constant Entity_Id := |
4176 | Defining_Entity | |
4177 | (Specification (Corresponding_Stub (Parent (N)))); | |
4178 | ||
996ae0b0 | 4179 | Conformant : Boolean := False; |
996ae0b0 RK |
4180 | |
4181 | begin | |
4182 | if No (Spec_Id) then | |
4183 | Check_Fully_Conformant (Body_Id, Old_Id); | |
4184 | ||
4185 | else | |
4186 | Check_Conformance | |
4187 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
4188 | ||
4189 | if not Conformant then | |
4190 | ||
dbe36d67 AC |
4191 | -- The stub was taken to be a new declaration. Indicate that |
4192 | -- it lacks a body. | |
996ae0b0 RK |
4193 | |
4194 | Set_Has_Completion (Old_Id, False); | |
4195 | end if; | |
4196 | end if; | |
4197 | end; | |
4198 | end if; | |
4199 | ||
4200 | Set_Has_Completion (Body_Id); | |
4201 | Check_Eliminated (Body_Id); | |
4202 | ||
caf07df9 AC |
4203 | -- Analyze any aspect specifications that appear on the subprogram body |
4204 | -- stub. Stop the analysis now as the stub does not have a declarative | |
4205 | -- or a statement part, and it cannot be inlined. | |
c8a3028c | 4206 | |
caf07df9 | 4207 | if Nkind (N) = N_Subprogram_Body_Stub then |
c8a3028c | 4208 | if Has_Aspects (N) then |
e9d08fd7 | 4209 | Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
c8a3028c AC |
4210 | end if; |
4211 | ||
d65a80fd | 4212 | goto Leave; |
84f4072a | 4213 | end if; |
996ae0b0 | 4214 | |
9cc6b3f8 | 4215 | -- Handle inlining |
84f4072a | 4216 | |
b94b6c56 RD |
4217 | -- Note: Normally we don't do any inlining if expansion is off, since |
4218 | -- we won't generate code in any case. An exception arises in GNATprove | |
2d180af1 YM |
4219 | -- mode where we want to expand some calls in place, even with expansion |
4220 | -- disabled, since the inlining eases formal verification. | |
ecad37f3 | 4221 | |
6c26bac2 AC |
4222 | if not GNATprove_Mode |
4223 | and then Expander_Active | |
4224 | and then Serious_Errors_Detected = 0 | |
4225 | and then Present (Spec_Id) | |
4226 | and then Has_Pragma_Inline (Spec_Id) | |
4227 | then | |
ca90b962 | 4228 | -- Legacy implementation (relying on front-end inlining) |
84f4072a | 4229 | |
6c26bac2 | 4230 | if not Back_End_Inlining then |
17ce1f52 | 4231 | if (Has_Pragma_Inline_Always (Spec_Id) |
9cc6b3f8 EB |
4232 | and then not Opt.Disable_FE_Inline_Always) |
4233 | or else (Front_End_Inlining | |
4234 | and then not Opt.Disable_FE_Inline) | |
6c26bac2 AC |
4235 | then |
4236 | Build_Body_To_Inline (N, Spec_Id); | |
4237 | end if; | |
f087ea44 | 4238 | |
9cc6b3f8 | 4239 | -- New implementation (relying on back-end inlining) |
f087ea44 | 4240 | |
6c26bac2 AC |
4241 | else |
4242 | if Has_Pragma_Inline_Always (Spec_Id) | |
4243 | or else Optimization_Level > 0 | |
4244 | then | |
4245 | -- Handle function returning an unconstrained type | |
f087ea44 | 4246 | |
6c26bac2 AC |
4247 | if Comes_From_Source (Body_Id) |
4248 | and then Ekind (Spec_Id) = E_Function | |
4249 | and then Returns_Unconstrained_Type (Spec_Id) | |
5c5e108f AC |
4250 | |
4251 | -- If function builds in place, i.e. returns a limited type, | |
4252 | -- inlining cannot be done. | |
4253 | ||
4254 | and then not Is_Limited_Type (Etype (Spec_Id)) | |
6c26bac2 | 4255 | then |
16b10ccc | 4256 | Check_And_Split_Unconstrained_Function (N, Spec_Id, Body_Id); |
84f4072a | 4257 | |
6c26bac2 AC |
4258 | else |
4259 | declare | |
b80a2b4b AC |
4260 | Subp_Body : constant Node_Id := |
4261 | Unit_Declaration_Node (Body_Id); | |
6c26bac2 | 4262 | Subp_Decl : constant List_Id := Declarations (Subp_Body); |
84f4072a | 4263 | |
6c26bac2 AC |
4264 | begin |
4265 | -- Do not pass inlining to the backend if the subprogram | |
4266 | -- has declarations or statements which cannot be inlined | |
4267 | -- by the backend. This check is done here to emit an | |
4268 | -- error instead of the generic warning message reported | |
4269 | -- by the GCC backend (ie. "function might not be | |
4270 | -- inlinable"). | |
4271 | ||
4272 | if Present (Subp_Decl) | |
4273 | and then Has_Excluded_Declaration (Spec_Id, Subp_Decl) | |
4274 | then | |
4275 | null; | |
4276 | ||
4277 | elsif Has_Excluded_Statement | |
4278 | (Spec_Id, | |
4279 | Statements | |
4280 | (Handled_Statement_Sequence (Subp_Body))) | |
4281 | then | |
4282 | null; | |
4283 | ||
4284 | -- If the backend inlining is available then at this | |
4285 | -- stage we only have to mark the subprogram as inlined. | |
4286 | -- The expander will take care of registering it in the | |
4287 | -- table of subprograms inlined by the backend a part of | |
4288 | -- processing calls to it (cf. Expand_Call) | |
4289 | ||
4290 | else | |
4291 | Set_Is_Inlined (Spec_Id); | |
4292 | end if; | |
4293 | end; | |
4294 | end if; | |
4295 | end if; | |
4296 | end if; | |
2d180af1 YM |
4297 | |
4298 | -- In GNATprove mode, inline only when there is a separate subprogram | |
4299 | -- declaration for now, as inlining of subprogram bodies acting as | |
ca90b962 | 4300 | -- declarations, or subprogram stubs, are not supported by front-end |
2d180af1 | 4301 | -- inlining. This inlining should occur after analysis of the body, so |
d29f68cf AC |
4302 | -- that it is known whether the value of SPARK_Mode, which can be |
4303 | -- defined by a pragma inside the body, is applicable to the body. | |
c1025b4e | 4304 | -- Inlining can be disabled with switch -gnatdm |
2d180af1 YM |
4305 | |
4306 | elsif GNATprove_Mode | |
2d180af1 YM |
4307 | and then Full_Analysis |
4308 | and then not Inside_A_Generic | |
4309 | and then Present (Spec_Id) | |
7c4d86c9 AC |
4310 | and then |
4311 | Nkind (Unit_Declaration_Node (Spec_Id)) = N_Subprogram_Declaration | |
fd22e260 | 4312 | and then Body_Has_SPARK_Mode_On |
2d180af1 | 4313 | and then Can_Be_Inlined_In_GNATprove_Mode (Spec_Id, Body_Id) |
ac072cb2 | 4314 | and then not Body_Has_Contract |
c1025b4e | 4315 | and then not Debug_Flag_M |
2d180af1 | 4316 | then |
6c26bac2 | 4317 | Build_Body_To_Inline (N, Spec_Id); |
996ae0b0 RK |
4318 | end if; |
4319 | ||
0d6014fa | 4320 | -- When generating code, inherited pre/postconditions are handled when |
0f6251c7 | 4321 | -- expanding the corresponding contract. |
539ca5ec | 4322 | |
0ab80019 | 4323 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 4324 | -- of the specification we have to install the private withed units. |
21d27997 | 4325 | -- This holds for child units as well. |
9bc856dd AC |
4326 | |
4327 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 4328 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
4329 | then |
4330 | Install_Private_With_Clauses (Body_Id); | |
4331 | end if; | |
4332 | ||
ec4867fa ES |
4333 | Check_Anonymous_Return; |
4334 | ||
fdce4bb7 JM |
4335 | -- Set the Protected_Formal field of each extra formal of the protected |
4336 | -- subprogram to reference the corresponding extra formal of the | |
4337 | -- subprogram that implements it. For regular formals this occurs when | |
4338 | -- the protected subprogram's declaration is expanded, but the extra | |
4339 | -- formals don't get created until the subprogram is frozen. We need to | |
4340 | -- do this before analyzing the protected subprogram's body so that any | |
4341 | -- references to the original subprogram's extra formals will be changed | |
4342 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
4343 | ||
4344 | if Present (Spec_Id) | |
4345 | and then Is_Protected_Type (Scope (Spec_Id)) | |
4346 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
4347 | then | |
4348 | declare | |
4349 | Impl_Subp : constant Entity_Id := | |
4350 | Protected_Body_Subprogram (Spec_Id); | |
4351 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
4352 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
cf9a473e | 4353 | |
fdce4bb7 JM |
4354 | begin |
4355 | while Present (Prot_Ext_Formal) loop | |
4356 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 4357 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
4358 | Next_Formal_With_Extras (Prot_Ext_Formal); |
4359 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
4360 | end loop; | |
4361 | end; | |
4362 | end if; | |
4363 | ||
0868e09c | 4364 | -- Now we can go on to analyze the body |
996ae0b0 RK |
4365 | |
4366 | HSS := Handled_Statement_Sequence (N); | |
4367 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 4368 | |
f3d0f304 | 4369 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
4370 | -- for discriminals and privals and finally a declaration for the entry |
4371 | -- family index (if applicable). This form of early expansion is done | |
4372 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 | 4373 | -- references entities which were created during regular expansion. The |
3b8056a5 AC |
4374 | -- subprogram entity must come from source, and not be an internally |
4375 | -- generated subprogram. | |
21d27997 | 4376 | |
4460a9bc | 4377 | if Expander_Active |
21d27997 RD |
4378 | and then Present (Prot_Typ) |
4379 | and then Present (Spec_Id) | |
3b8056a5 | 4380 | and then Comes_From_Source (Spec_Id) |
21d27997 RD |
4381 | and then not Is_Eliminated (Spec_Id) |
4382 | then | |
4383 | Install_Private_Data_Declarations | |
4384 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
4385 | end if; | |
4386 | ||
5dcab3ca AC |
4387 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
4388 | -- may now appear in parameter and result profiles. Since the analysis | |
4389 | -- of a subprogram body may use the parameter and result profile of the | |
4390 | -- spec, swap any limited views with their non-limited counterpart. | |
4391 | ||
128a98ea | 4392 | if Ada_Version >= Ada_2012 and then Present (Spec_Id) then |
1e55d29a | 4393 | Exch_Views := Exchange_Limited_Views (Spec_Id); |
5dcab3ca AC |
4394 | end if; |
4395 | ||
128a98ea EB |
4396 | -- If the return type is an anonymous access type whose designated type |
4397 | -- is the limited view of a class-wide type and the non-limited view is | |
4398 | -- available, update the return type accordingly. | |
4399 | ||
4400 | if Ada_Version >= Ada_2005 and then Present (Spec_Id) then | |
4401 | declare | |
4402 | Etyp : Entity_Id; | |
4403 | Rtyp : Entity_Id; | |
4404 | ||
4405 | begin | |
4406 | Rtyp := Etype (Spec_Id); | |
4407 | ||
4408 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
4409 | Etyp := Directly_Designated_Type (Rtyp); | |
4410 | ||
4411 | if Is_Class_Wide_Type (Etyp) | |
4412 | and then From_Limited_With (Etyp) | |
4413 | then | |
4414 | Desig_View := Etyp; | |
4415 | Set_Directly_Designated_Type (Rtyp, Available_View (Etyp)); | |
4416 | end if; | |
4417 | end if; | |
4418 | end; | |
4419 | end if; | |
4420 | ||
c8a3028c AC |
4421 | -- Analyze any aspect specifications that appear on the subprogram body |
4422 | ||
4423 | if Has_Aspects (N) then | |
e9d08fd7 | 4424 | Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
c8a3028c | 4425 | end if; |
378dc6ca | 4426 | |
996ae0b0 | 4427 | Analyze_Declarations (Declarations (N)); |
21d27997 | 4428 | |
f3124d8f | 4429 | -- Verify that the SPARK_Mode of the body agrees with that of its spec |
f90d14ac | 4430 | |
f1c7be38 | 4431 | if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then |
f90d14ac | 4432 | if Present (SPARK_Pragma (Spec_Id)) then |
933aa0ac | 4433 | if Get_SPARK_Mode_From_Annotation (SPARK_Pragma (Spec_Id)) = Off |
f90d14ac | 4434 | and then |
933aa0ac | 4435 | Get_SPARK_Mode_From_Annotation (SPARK_Pragma (Body_Id)) = On |
f90d14ac AC |
4436 | then |
4437 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
4438 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
4439 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); | |
4440 | Error_Msg_NE | |
f3124d8f | 4441 | ("\value Off was set for SPARK_Mode on & #", N, Spec_Id); |
f90d14ac AC |
4442 | end if; |
4443 | ||
4444 | elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then | |
4445 | null; | |
4446 | ||
4447 | else | |
4448 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3ccedacc | 4449 | Error_Msg_N ("incorrect application of SPARK_Mode #", N); |
f90d14ac | 4450 | Error_Msg_Sloc := Sloc (Spec_Id); |
f3124d8f HK |
4451 | Error_Msg_NE |
4452 | ("\no value was set for SPARK_Mode on & #", N, Spec_Id); | |
f90d14ac AC |
4453 | end if; |
4454 | end if; | |
4455 | ||
65e5747e | 4456 | -- A subprogram body freezes its own contract. Analyze the contract |
879ac954 AC |
4457 | -- after the declarations of the body have been processed as pragmas |
4458 | -- are now chained on the contract of the subprogram body. | |
c9d70ab1 | 4459 | |
f99ff327 | 4460 | Analyze_Entry_Or_Subprogram_Body_Contract (Body_Id); |
c9d70ab1 | 4461 | |
21d27997 RD |
4462 | -- Check completion, and analyze the statements |
4463 | ||
996ae0b0 | 4464 | Check_Completion; |
33931112 | 4465 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 4466 | Analyze (HSS); |
21d27997 RD |
4467 | |
4468 | -- Deal with end of scope processing for the body | |
4469 | ||
07fc65c4 | 4470 | Process_End_Label (HSS, 't', Current_Scope); |
851e9f19 | 4471 | Update_Use_Clause_Chain; |
996ae0b0 | 4472 | End_Scope; |
5e127570 AC |
4473 | |
4474 | -- If we are compiling an entry wrapper, remove the enclosing | |
ffa168bc | 4475 | -- synchronized object from the stack. |
5e127570 AC |
4476 | |
4477 | if Is_Entry_Wrapper (Body_Id) then | |
4478 | End_Scope; | |
4479 | end if; | |
4480 | ||
996ae0b0 | 4481 | Check_Subprogram_Order (N); |
c37bb106 | 4482 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
4483 | |
4484 | -- If we have a separate spec, then the analysis of the declarations | |
4485 | -- caused the entities in the body to be chained to the spec id, but | |
4486 | -- we want them chained to the body id. Only the formal parameters | |
4487 | -- end up chained to the spec id in this case. | |
4488 | ||
4489 | if Present (Spec_Id) then | |
4490 | ||
d39d6bb8 | 4491 | -- We must conform to the categorization of our spec |
996ae0b0 | 4492 | |
d39d6bb8 | 4493 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 4494 | |
d39d6bb8 RD |
4495 | -- And if this is a child unit, the parent units must conform |
4496 | ||
4497 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
4498 | Validate_Categorization_Dependency |
4499 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
4500 | end if; | |
4501 | ||
21d27997 RD |
4502 | -- Here is where we move entities from the spec to the body |
4503 | ||
4504 | -- Case where there are entities that stay with the spec | |
4505 | ||
4506 | if Present (Last_Real_Spec_Entity) then | |
4507 | ||
dbe36d67 AC |
4508 | -- No body entities (happens when the only real spec entities come |
4509 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
4510 | |
4511 | if No (Last_Entity (Body_Id)) then | |
7c4d86c9 | 4512 | Set_First_Entity (Body_Id, Next_Entity (Last_Real_Spec_Entity)); |
21d27997 RD |
4513 | |
4514 | -- Body entities present (formals), so chain stuff past them | |
4515 | ||
4516 | else | |
4517 | Set_Next_Entity | |
4518 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
4519 | end if; | |
4520 | ||
4521 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 4522 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
4523 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
4524 | ||
dbe36d67 AC |
4525 | -- Case where there are no spec entities, in this case there can be |
4526 | -- no body entities either, so just move everything. | |
996ae0b0 | 4527 | |
a921e83c AC |
4528 | -- If the body is generated for an expression function, it may have |
4529 | -- been preanalyzed already, if 'access was applied to it. | |
4530 | ||
996ae0b0 | 4531 | else |
a921e83c AC |
4532 | if Nkind (Original_Node (Unit_Declaration_Node (Spec_Id))) /= |
4533 | N_Expression_Function | |
4534 | then | |
4535 | pragma Assert (No (Last_Entity (Body_Id))); | |
4536 | null; | |
4537 | end if; | |
4538 | ||
996ae0b0 RK |
4539 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
4540 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
4541 | Set_First_Entity (Spec_Id, Empty); | |
4542 | Set_Last_Entity (Spec_Id, Empty); | |
4543 | end if; | |
ed27b86b HK |
4544 | |
4545 | -- Otherwise the body does not complete a previous declaration. Check | |
4546 | -- the categorization of the body against the units it withs. | |
4547 | ||
4548 | else | |
4549 | Validate_Categorization_Dependency (N, Body_Id); | |
996ae0b0 RK |
4550 | end if; |
4551 | ||
7665e4bd | 4552 | Check_Missing_Return; |
996ae0b0 | 4553 | |
82c80734 | 4554 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
4555 | -- the body of the procedure. But first we deal with a special case |
4556 | -- where we want to modify this check. If the body of the subprogram | |
4557 | -- starts with a raise statement or its equivalent, or if the body | |
cf3e6845 AC |
4558 | -- consists entirely of a null statement, then it is pretty obvious that |
4559 | -- it is OK to not reference the parameters. For example, this might be | |
4560 | -- the following common idiom for a stubbed function: statement of the | |
4561 | -- procedure raises an exception. In particular this deals with the | |
4562 | -- common idiom of a stubbed function, which appears something like: | |
fbf5a39b AC |
4563 | |
4564 | -- function F (A : Integer) return Some_Type; | |
4565 | -- X : Some_Type; | |
4566 | -- begin | |
4567 | -- raise Program_Error; | |
4568 | -- return X; | |
4569 | -- end F; | |
4570 | ||
76a69663 ES |
4571 | -- Here the purpose of X is simply to satisfy the annoying requirement |
4572 | -- in Ada that there be at least one return, and we certainly do not | |
a90bd866 | 4573 | -- want to go posting warnings on X that it is not initialized. On |
76a69663 ES |
4574 | -- the other hand, if X is entirely unreferenced that should still |
4575 | -- get a warning. | |
4576 | ||
4577 | -- What we do is to detect these cases, and if we find them, flag the | |
4578 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
4579 | -- suppress unwanted warnings. For the case of the function stub above | |
4580 | -- we have a special test to set X as apparently assigned to suppress | |
4581 | -- the warning. | |
996ae0b0 RK |
4582 | |
4583 | declare | |
800621e0 | 4584 | Stm : Node_Id; |
996ae0b0 RK |
4585 | |
4586 | begin | |
90e491a7 PMR |
4587 | -- Skip call markers installed by the ABE mechanism, labels, and |
4588 | -- Push_xxx_Error_Label to find the first real statement. | |
fbf5a39b | 4589 | |
800621e0 | 4590 | Stm := First (Statements (HSS)); |
90e491a7 | 4591 | while Nkind_In (Stm, N_Call_Marker, N_Label) |
0a36105d JM |
4592 | or else Nkind (Stm) in N_Push_xxx_Label |
4593 | loop | |
996ae0b0 | 4594 | Next (Stm); |
0a36105d | 4595 | end loop; |
996ae0b0 | 4596 | |
fbf5a39b AC |
4597 | -- Do the test on the original statement before expansion |
4598 | ||
4599 | declare | |
4600 | Ostm : constant Node_Id := Original_Node (Stm); | |
4601 | ||
4602 | begin | |
76a69663 | 4603 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
4604 | |
4605 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
4606 | Set_Trivial_Subprogram (Stm); |
4607 | ||
f3d57416 | 4608 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
4609 | |
4610 | elsif Nkind (Stm) = N_Null_Statement | |
4611 | and then Comes_From_Source (Stm) | |
4612 | and then No (Next (Stm)) | |
4613 | then | |
4614 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
4615 | |
4616 | -- Check for explicit call cases which likely raise an exception | |
4617 | ||
4618 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
4619 | if Is_Entity_Name (Name (Ostm)) then | |
4620 | declare | |
4621 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
4622 | ||
4623 | begin | |
4624 | -- If the procedure is marked No_Return, then likely it | |
4625 | -- raises an exception, but in any case it is not coming | |
76a69663 | 4626 | -- back here, so turn on the flag. |
fbf5a39b | 4627 | |
f46faa08 AC |
4628 | if Present (Ent) |
4629 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
4630 | and then No_Return (Ent) |
4631 | then | |
76a69663 | 4632 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
4633 | end if; |
4634 | end; | |
4635 | end if; | |
4636 | end if; | |
4637 | end; | |
996ae0b0 RK |
4638 | end; |
4639 | ||
4640 | -- Check for variables that are never modified | |
4641 | ||
4642 | declare | |
d65a80fd HK |
4643 | E1 : Entity_Id; |
4644 | E2 : Entity_Id; | |
996ae0b0 RK |
4645 | |
4646 | begin | |
fbf5a39b | 4647 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
4648 | -- flags from out parameters to the corresponding entities in the |
4649 | -- body. The reason we do that is we want to post error flags on | |
4650 | -- the body entities, not the spec entities. | |
4651 | ||
4652 | if Present (Spec_Id) then | |
4653 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
4654 | while Present (E1) loop |
4655 | if Ekind (E1) = E_Out_Parameter then | |
4656 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 4657 | while Present (E2) loop |
996ae0b0 RK |
4658 | exit when Chars (E1) = Chars (E2); |
4659 | Next_Entity (E2); | |
4660 | end loop; | |
4661 | ||
fbf5a39b AC |
4662 | if Present (E2) then |
4663 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
4664 | end if; | |
996ae0b0 RK |
4665 | end if; |
4666 | ||
4667 | Next_Entity (E1); | |
4668 | end loop; | |
4669 | end if; | |
4670 | ||
3f89eb7f JS |
4671 | -- Check references of the subprogram spec when we are dealing with |
4672 | -- an expression function due to it having a generated body. | |
4673 | -- Otherwise, we simply check the formals of the subprogram body. | |
0868e09c | 4674 | |
3f89eb7f JS |
4675 | if Present (Spec_Id) |
4676 | and then Is_Expression_Function (Spec_Id) | |
4677 | then | |
4678 | Check_References (Spec_Id); | |
4679 | else | |
4680 | Check_References (Body_Id); | |
4681 | end if; | |
996ae0b0 | 4682 | end; |
5a271a7f RD |
4683 | |
4684 | -- Check for nested subprogram, and mark outer level subprogram if so | |
4685 | ||
4686 | declare | |
4687 | Ent : Entity_Id; | |
4688 | ||
4689 | begin | |
4690 | if Present (Spec_Id) then | |
4691 | Ent := Spec_Id; | |
4692 | else | |
4693 | Ent := Body_Id; | |
4694 | end if; | |
4695 | ||
4696 | loop | |
4697 | Ent := Enclosing_Subprogram (Ent); | |
4698 | exit when No (Ent) or else Is_Subprogram (Ent); | |
4699 | end loop; | |
4700 | ||
4701 | if Present (Ent) then | |
4702 | Set_Has_Nested_Subprogram (Ent); | |
4703 | end if; | |
4704 | end; | |
241ebe89 | 4705 | |
1e55d29a EB |
4706 | -- Restore the limited views in the spec, if any, to let the back end |
4707 | -- process it without running into circularities. | |
4708 | ||
4709 | if Exch_Views /= No_Elist then | |
4710 | Restore_Limited_Views (Exch_Views); | |
4711 | end if; | |
4712 | ||
a83d0680 AC |
4713 | if Mask_Types /= No_Elist then |
4714 | Unmask_Unfrozen_Types (Mask_Types); | |
4715 | end if; | |
4716 | ||
128a98ea EB |
4717 | if Present (Desig_View) then |
4718 | Set_Directly_Designated_Type (Etype (Spec_Id), Desig_View); | |
4719 | end if; | |
4720 | ||
d65a80fd | 4721 | <<Leave>> |
f9a8f910 HK |
4722 | Ignore_SPARK_Mode_Pragmas_In_Instance := Saved_ISMP; |
4723 | Restore_Ghost_Mode (Saved_GM); | |
b1b543d2 | 4724 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 RK |
4725 | |
4726 | ------------------------------------ | |
4727 | -- Analyze_Subprogram_Declaration -- | |
4728 | ------------------------------------ | |
4729 | ||
4730 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
579847c2 | 4731 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc | 4732 | Designator : Entity_Id; |
579847c2 | 4733 | |
4d8f3296 ES |
4734 | Is_Completion : Boolean; |
4735 | -- Indicates whether a null procedure declaration is a completion | |
996ae0b0 RK |
4736 | |
4737 | begin | |
2ba431e5 | 4738 | -- Null procedures are not allowed in SPARK |
daec8eeb | 4739 | |
fe5d3068 | 4740 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
4741 | and then Null_Present (Specification (N)) |
4742 | then | |
ce5ba43a | 4743 | Check_SPARK_05_Restriction ("null procedure is not allowed", N); |
718deaf1 | 4744 | |
73cc8f62 RD |
4745 | -- Null procedures are allowed in protected types, following the |
4746 | -- recent AI12-0147. | |
b741083a ES |
4747 | |
4748 | if Is_Protected_Type (Current_Scope) | |
4749 | and then Ada_Version < Ada_2012 | |
4750 | then | |
4d8f3296 ES |
4751 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
4752 | end if; | |
718deaf1 | 4753 | |
4d8f3296 | 4754 | Analyze_Null_Procedure (N, Is_Completion); |
718deaf1 | 4755 | |
241ebe89 | 4756 | -- The null procedure acts as a body, nothing further is needed |
5d5832bc | 4757 | |
241ebe89 | 4758 | if Is_Completion then |
4d8f3296 | 4759 | return; |
5d5832bc AC |
4760 | end if; |
4761 | end if; | |
4762 | ||
beacce02 | 4763 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
4764 | |
4765 | -- A reference may already have been generated for the unit name, in | |
4766 | -- which case the following call is redundant. However it is needed for | |
4767 | -- declarations that are the rewriting of an expression function. | |
4768 | ||
5d5832bc AC |
4769 | Generate_Definition (Designator); |
4770 | ||
877a5a12 AC |
4771 | -- Set the SPARK mode from the current context (may be overwritten later |
4772 | -- with explicit pragma). This is not done for entry barrier functions | |
4773 | -- because they are generated outside the protected type and should not | |
4774 | -- carry the mode of the enclosing context. | |
4a854847 | 4775 | |
877a5a12 AC |
4776 | if Nkind (N) = N_Subprogram_Declaration |
4777 | and then Is_Entry_Barrier_Function (N) | |
4778 | then | |
4779 | null; | |
90e491a7 | 4780 | |
877a5a12 | 4781 | else |
90e491a7 | 4782 | Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
877a5a12 AC |
4783 | Set_SPARK_Pragma_Inherited (Designator); |
4784 | end if; | |
579847c2 | 4785 | |
cf9a473e AC |
4786 | -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case |
4787 | -- the body of this subprogram is instantiated or inlined later and out | |
4788 | -- of context. The body uses this attribute to restore the value of the | |
4789 | -- global flag. | |
4790 | ||
4791 | if Ignore_SPARK_Mode_Pragmas_In_Instance then | |
4792 | Set_Ignore_SPARK_Mode_Pragmas (Designator); | |
4793 | end if; | |
4794 | ||
90e491a7 PMR |
4795 | -- Preserve relevant elaboration-related attributes of the context which |
4796 | -- are no longer available or very expensive to recompute once analysis, | |
4797 | -- resolution, and expansion are over. | |
4798 | ||
4799 | Mark_Elaboration_Attributes | |
162ed06f HK |
4800 | (N_Id => Designator, |
4801 | Checks => True, | |
4802 | Warnings => True); | |
90e491a7 | 4803 | |
b1b543d2 BD |
4804 | if Debug_Flag_C then |
4805 | Write_Str ("==> subprogram spec "); | |
4806 | Write_Name (Chars (Designator)); | |
4807 | Write_Str (" from "); | |
4808 | Write_Location (Sloc (N)); | |
4809 | Write_Eol; | |
4810 | Indent; | |
4811 | end if; | |
4812 | ||
996ae0b0 | 4813 | Validate_RCI_Subprogram_Declaration (N); |
996ae0b0 RK |
4814 | New_Overloaded_Entity (Designator); |
4815 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 4816 | |
cf3e6845 AC |
4817 | -- If the type of the first formal of the current subprogram is a non- |
4818 | -- generic tagged private type, mark the subprogram as being a private | |
4819 | -- primitive. Ditto if this is a function with controlling result, and | |
4820 | -- the return type is currently private. In both cases, the type of the | |
4821 | -- controlling argument or result must be in the current scope for the | |
4822 | -- operation to be primitive. | |
6ca063eb AC |
4823 | |
4824 | if Has_Controlling_Result (Designator) | |
4825 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 4826 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
4827 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
4828 | then | |
4829 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 4830 | |
6ca063eb | 4831 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
4832 | declare |
4833 | Formal_Typ : constant Entity_Id := | |
4834 | Etype (First_Formal (Designator)); | |
4835 | begin | |
4836 | Set_Is_Private_Primitive (Designator, | |
4837 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 4838 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
4839 | and then Is_Private_Type (Formal_Typ) |
4840 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
4841 | end; | |
4842 | end if; | |
4843 | ||
ec4867fa ES |
4844 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
4845 | -- or null. | |
4846 | ||
0791fbe9 | 4847 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
4848 | and then Comes_From_Source (N) |
4849 | and then Is_Dispatching_Operation (Designator) | |
4850 | then | |
4851 | declare | |
4852 | E : Entity_Id; | |
4853 | Etyp : Entity_Id; | |
4854 | ||
4855 | begin | |
4856 | if Has_Controlling_Result (Designator) then | |
4857 | Etyp := Etype (Designator); | |
4858 | ||
4859 | else | |
4860 | E := First_Entity (Designator); | |
4861 | while Present (E) | |
4862 | and then Is_Formal (E) | |
4863 | and then not Is_Controlling_Formal (E) | |
4864 | loop | |
4865 | Next_Entity (E); | |
4866 | end loop; | |
4867 | ||
4868 | Etyp := Etype (E); | |
4869 | end if; | |
4870 | ||
4871 | if Is_Access_Type (Etyp) then | |
4872 | Etyp := Directly_Designated_Type (Etyp); | |
4873 | end if; | |
4874 | ||
4875 | if Is_Interface (Etyp) | |
f937473f | 4876 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa | 4877 | and then not (Ekind (Designator) = E_Procedure |
8fde064e | 4878 | and then Null_Present (Specification (N))) |
ec4867fa ES |
4879 | then |
4880 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
4881 | |
4882 | -- Specialize error message based on procedures vs. functions, | |
4883 | -- since functions can't be null subprograms. | |
4884 | ||
4885 | if Ekind (Designator) = E_Procedure then | |
4886 | Error_Msg_N | |
4887 | ("interface procedure % must be abstract or null", N); | |
4888 | else | |
3f80a182 AC |
4889 | Error_Msg_N |
4890 | ("interface function % must be abstract", N); | |
033eaf85 | 4891 | end if; |
ec4867fa ES |
4892 | end if; |
4893 | end; | |
4894 | end if; | |
4895 | ||
fbf5a39b AC |
4896 | -- What is the following code for, it used to be |
4897 | ||
4898 | -- ??? Set_Suppress_Elaboration_Checks | |
4899 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
4900 | ||
4901 | -- The following seems equivalent, but a bit dubious | |
4902 | ||
4903 | if Elaboration_Checks_Suppressed (Designator) then | |
4904 | Set_Kill_Elaboration_Checks (Designator); | |
4905 | end if; | |
996ae0b0 | 4906 | |
996ae0b0 RK |
4907 | -- For a compilation unit, set body required. This flag will only be |
4908 | -- reset if a valid Import or Interface pragma is processed later on. | |
4909 | ||
4910 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
4911 | Set_Body_Required (Parent (N), True); | |
758c442c | 4912 | |
0791fbe9 | 4913 | if Ada_Version >= Ada_2005 |
758c442c GD |
4914 | and then Nkind (Specification (N)) = N_Procedure_Specification |
4915 | and then Null_Present (Specification (N)) | |
4916 | then | |
4917 | Error_Msg_N | |
4918 | ("null procedure cannot be declared at library level", N); | |
4919 | end if; | |
996ae0b0 RK |
4920 | end if; |
4921 | ||
fbf5a39b | 4922 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 4923 | Check_Eliminated (Designator); |
fbf5a39b | 4924 | |
b1b543d2 BD |
4925 | if Debug_Flag_C then |
4926 | Outdent; | |
4927 | Write_Str ("<== subprogram spec "); | |
4928 | Write_Name (Chars (Designator)); | |
4929 | Write_Str (" from "); | |
4930 | Write_Location (Sloc (N)); | |
4931 | Write_Eol; | |
4932 | end if; | |
0f1a6a0b | 4933 | |
80f0c69c HK |
4934 | -- Indicate that this is a protected operation, because it may be used |
4935 | -- in subsequent declarations within the protected type. | |
1a265e78 | 4936 | |
80f0c69c | 4937 | if Is_Protected_Type (Current_Scope) then |
1a265e78 AC |
4938 | Set_Convention (Designator, Convention_Protected); |
4939 | end if; | |
4940 | ||
beacce02 | 4941 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb | 4942 | |
80f0c69c HK |
4943 | -- Process the aspects before establishing the proper categorization in |
4944 | -- case the subprogram is a compilation unit and one of its aspects is | |
4945 | -- converted into a categorization pragma. | |
4946 | ||
eaba57fb RD |
4947 | if Has_Aspects (N) then |
4948 | Analyze_Aspect_Specifications (N, Designator); | |
4949 | end if; | |
80f0c69c HK |
4950 | |
4951 | if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then | |
4952 | Set_Categorization_From_Scope (Designator, Scop); | |
4953 | ||
4954 | -- Otherwise the unit is a compilation unit and/or a child unit. Set the | |
4955 | -- proper categorization of the unit based on its pragmas. | |
4956 | ||
4957 | else | |
4958 | Push_Scope (Designator); | |
4959 | Set_Categorization_From_Pragmas (N); | |
4960 | Validate_Categorization_Dependency (N, Designator); | |
4961 | Pop_Scope; | |
4962 | end if; | |
996ae0b0 RK |
4963 | end Analyze_Subprogram_Declaration; |
4964 | ||
fbf5a39b AC |
4965 | -------------------------------------- |
4966 | -- Analyze_Subprogram_Specification -- | |
4967 | -------------------------------------- | |
4968 | ||
4969 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
4970 | -- declaration). This procedure is called to analyze the specification in | |
4971 | -- both subprogram bodies and subprogram declarations (specs). | |
4972 | ||
4973 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
3ddfabe3 AC |
4974 | function Is_Invariant_Procedure_Or_Body (E : Entity_Id) return Boolean; |
4975 | -- Determine whether entity E denotes the spec or body of an invariant | |
4976 | -- procedure. | |
4977 | ||
4978 | ------------------------------------ | |
4979 | -- Is_Invariant_Procedure_Or_Body -- | |
4980 | ------------------------------------ | |
4981 | ||
4982 | function Is_Invariant_Procedure_Or_Body (E : Entity_Id) return Boolean is | |
4983 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
4984 | Spec : Entity_Id; | |
4985 | ||
4986 | begin | |
4987 | if Nkind (Decl) = N_Subprogram_Body then | |
4988 | Spec := Corresponding_Spec (Decl); | |
4989 | else | |
4990 | Spec := E; | |
4991 | end if; | |
4992 | ||
4993 | return | |
4994 | Present (Spec) | |
4995 | and then Ekind (Spec) = E_Procedure | |
4996 | and then (Is_Partial_Invariant_Procedure (Spec) | |
4997 | or else Is_Invariant_Procedure (Spec)); | |
4998 | end Is_Invariant_Procedure_Or_Body; | |
4999 | ||
5000 | -- Local variables | |
5001 | ||
fbf5a39b | 5002 | Designator : constant Entity_Id := Defining_Entity (N); |
21d27997 | 5003 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 5004 | |
758c442c GD |
5005 | -- Start of processing for Analyze_Subprogram_Specification |
5006 | ||
fbf5a39b | 5007 | begin |
2ba431e5 | 5008 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 5009 | |
db72f10a AC |
5010 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
5011 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
5012 | then | |
ce5ba43a AC |
5013 | Check_SPARK_05_Restriction |
5014 | ("user-defined operator is not allowed", N); | |
38171f43 AC |
5015 | end if; |
5016 | ||
31af8899 AC |
5017 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
5018 | -- specification comes from an expression function, because it may be | |
a3f9da70 | 5019 | -- the completion of a previous declaration. If it is not, the cross- |
31af8899 AC |
5020 | -- reference entry will be emitted for the new subprogram declaration. |
5021 | ||
5022 | if Nkind (Parent (N)) /= N_Expression_Function then | |
5023 | Generate_Definition (Designator); | |
5024 | end if; | |
38171f43 | 5025 | |
fbf5a39b AC |
5026 | if Nkind (N) = N_Function_Specification then |
5027 | Set_Ekind (Designator, E_Function); | |
5028 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
5029 | else |
5030 | Set_Ekind (Designator, E_Procedure); | |
5031 | Set_Etype (Designator, Standard_Void_Type); | |
5032 | end if; | |
5033 | ||
4bd4bb7f AC |
5034 | -- Flag Is_Inlined_Always is True by default, and reversed to False for |
5035 | -- those subprograms which could be inlined in GNATprove mode (because | |
319c6161 | 5036 | -- Body_To_Inline is non-Empty) but should not be inlined. |
4bd4bb7f AC |
5037 | |
5038 | if GNATprove_Mode then | |
5039 | Set_Is_Inlined_Always (Designator); | |
5040 | end if; | |
5041 | ||
800621e0 | 5042 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
5043 | |
5044 | Set_Scope (Designator, Current_Scope); | |
5045 | ||
fbf5a39b | 5046 | if Present (Formals) then |
0a36105d | 5047 | Push_Scope (Designator); |
fbf5a39b | 5048 | Process_Formals (Formals, N); |
758c442c | 5049 | |
0929eaeb AC |
5050 | -- Check dimensions in N for formals with default expression |
5051 | ||
5052 | Analyze_Dimension_Formals (N, Formals); | |
5053 | ||
a38ff9b1 ES |
5054 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
5055 | -- inherited interface operation, and the controlling type is | |
5056 | -- a synchronized type, replace the type with its corresponding | |
5057 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
5058 | -- Same processing for an access parameter whose designated type is |
5059 | -- derived from a synchronized interface. | |
758c442c | 5060 | |
3ddfabe3 AC |
5061 | -- This modification is not done for invariant procedures because |
5062 | -- the corresponding record may not necessarely be visible when the | |
5063 | -- concurrent type acts as the full view of a private type. | |
5064 | ||
5065 | -- package Pack is | |
5066 | -- type Prot is private with Type_Invariant => ...; | |
5067 | -- procedure ConcInvariant (Obj : Prot); | |
5068 | -- private | |
5069 | -- protected type Prot is ...; | |
5070 | -- type Concurrent_Record_Prot is record ...; | |
5071 | -- procedure ConcInvariant (Obj : Prot) is | |
5072 | -- ... | |
5073 | -- end ConcInvariant; | |
5074 | -- end Pack; | |
5075 | ||
5076 | -- In the example above, both the spec and body of the invariant | |
5077 | -- procedure must utilize the private type as the controlling type. | |
5078 | ||
5079 | if Ada_Version >= Ada_2005 | |
5080 | and then not Is_Invariant_Procedure_Or_Body (Designator) | |
5081 | then | |
d44202ba HK |
5082 | declare |
5083 | Formal : Entity_Id; | |
5084 | Formal_Typ : Entity_Id; | |
5085 | Rec_Typ : Entity_Id; | |
69cb258c | 5086 | Desig_Typ : Entity_Id; |
0a36105d | 5087 | |
d44202ba HK |
5088 | begin |
5089 | Formal := First_Formal (Designator); | |
5090 | while Present (Formal) loop | |
5091 | Formal_Typ := Etype (Formal); | |
0a36105d | 5092 | |
d44202ba HK |
5093 | if Is_Concurrent_Type (Formal_Typ) |
5094 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
5095 | then | |
5096 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
5097 | ||
5098 | if Present (Interfaces (Rec_Typ)) then | |
5099 | Set_Etype (Formal, Rec_Typ); | |
5100 | end if; | |
69cb258c AC |
5101 | |
5102 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
5103 | Desig_Typ := Designated_Type (Formal_Typ); | |
5104 | ||
5105 | if Is_Concurrent_Type (Desig_Typ) | |
5106 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
5107 | then | |
5108 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
5109 | ||
5110 | if Present (Interfaces (Rec_Typ)) then | |
5111 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
5112 | end if; | |
5113 | end if; | |
d44202ba HK |
5114 | end if; |
5115 | ||
5116 | Next_Formal (Formal); | |
5117 | end loop; | |
5118 | end; | |
758c442c GD |
5119 | end if; |
5120 | ||
fbf5a39b | 5121 | End_Scope; |
82c80734 | 5122 | |
b66c3ff4 AC |
5123 | -- The subprogram scope is pushed and popped around the processing of |
5124 | -- the return type for consistency with call above to Process_Formals | |
5125 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
5126 | -- itype created for the return type will be associated with the proper | |
5127 | -- scope. | |
5128 | ||
82c80734 | 5129 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 5130 | Push_Scope (Designator); |
82c80734 | 5131 | Analyze_Return_Type (N); |
b66c3ff4 | 5132 | End_Scope; |
fbf5a39b AC |
5133 | end if; |
5134 | ||
e606088a AC |
5135 | -- Function case |
5136 | ||
fbf5a39b | 5137 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
5138 | |
5139 | -- Deal with operator symbol case | |
5140 | ||
fbf5a39b AC |
5141 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
5142 | Valid_Operator_Definition (Designator); | |
5143 | end if; | |
5144 | ||
5145 | May_Need_Actuals (Designator); | |
5146 | ||
fe63b1b1 ES |
5147 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
5148 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
5149 | -- declarations, where abstractness is inherited, and to subprogram |
5150 | -- bodies generated for stream operations, which become renamings as | |
5151 | -- bodies. | |
2bfb1b72 | 5152 | |
fe63b1b1 ES |
5153 | -- In case of primitives associated with abstract interface types |
5154 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 5155 | |
1adaea16 | 5156 | if not Nkind_In (Original_Node (Parent (N)), |
3f80a182 | 5157 | N_Abstract_Subprogram_Declaration, |
847d950d HK |
5158 | N_Formal_Abstract_Subprogram_Declaration, |
5159 | N_Subprogram_Renaming_Declaration) | |
fbf5a39b | 5160 | then |
2e79de51 AC |
5161 | if Is_Abstract_Type (Etype (Designator)) |
5162 | and then not Is_Interface (Etype (Designator)) | |
5163 | then | |
5164 | Error_Msg_N | |
5165 | ("function that returns abstract type must be abstract", N); | |
5166 | ||
e606088a | 5167 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
5168 | -- access result whose designated type is abstract. |
5169 | ||
847d950d HK |
5170 | elsif Ada_Version >= Ada_2012 |
5171 | and then Nkind (Result_Definition (N)) = N_Access_Definition | |
2e79de51 AC |
5172 | and then |
5173 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
5174 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
2e79de51 | 5175 | then |
847d950d HK |
5176 | Error_Msg_N |
5177 | ("function whose access result designates abstract type " | |
5178 | & "must be abstract", N); | |
2e79de51 | 5179 | end if; |
fbf5a39b AC |
5180 | end if; |
5181 | end if; | |
5182 | ||
5183 | return Designator; | |
5184 | end Analyze_Subprogram_Specification; | |
5185 | ||
996ae0b0 RK |
5186 | ----------------------- |
5187 | -- Check_Conformance -- | |
5188 | ----------------------- | |
5189 | ||
5190 | procedure Check_Conformance | |
41251c60 JM |
5191 | (New_Id : Entity_Id; |
5192 | Old_Id : Entity_Id; | |
5193 | Ctype : Conformance_Type; | |
5194 | Errmsg : Boolean; | |
5195 | Conforms : out Boolean; | |
5196 | Err_Loc : Node_Id := Empty; | |
5197 | Get_Inst : Boolean := False; | |
5198 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 5199 | is |
996ae0b0 | 5200 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
5201 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
5202 | -- If Errmsg is True, then processing continues to post an error message | |
5203 | -- for conformance error on given node. Two messages are output. The | |
5204 | -- first message points to the previous declaration with a general "no | |
5205 | -- conformance" message. The second is the detailed reason, supplied as | |
5206 | -- Msg. The parameter N provide information for a possible & insertion | |
5207 | -- in the message, and also provides the location for posting the | |
5208 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 | 5209 | |
f991bd8e HK |
5210 | function Conventions_Match |
5211 | (Id1 : Entity_Id; | |
5212 | Id2 : Entity_Id) return Boolean; | |
5213 | -- Determine whether the conventions of arbitrary entities Id1 and Id2 | |
5214 | -- match. | |
5215 | ||
996ae0b0 RK |
5216 | ----------------------- |
5217 | -- Conformance_Error -- | |
5218 | ----------------------- | |
5219 | ||
5220 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
5221 | Enode : Node_Id; | |
5222 | ||
5223 | begin | |
5224 | Conforms := False; | |
5225 | ||
5226 | if Errmsg then | |
5227 | if No (Err_Loc) then | |
5228 | Enode := N; | |
5229 | else | |
5230 | Enode := Err_Loc; | |
5231 | end if; | |
5232 | ||
5233 | Error_Msg_Sloc := Sloc (Old_Id); | |
5234 | ||
5235 | case Ctype is | |
5236 | when Type_Conformant => | |
483c78cb | 5237 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
5238 | ("not type conformant with declaration#!", Enode); |
5239 | ||
5240 | when Mode_Conformant => | |
19590d70 | 5241 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5242 | Error_Msg_N |
19590d70 GD |
5243 | ("not mode conformant with operation inherited#!", |
5244 | Enode); | |
5245 | else | |
ed2233dc | 5246 | Error_Msg_N |
19590d70 GD |
5247 | ("not mode conformant with declaration#!", Enode); |
5248 | end if; | |
996ae0b0 RK |
5249 | |
5250 | when Subtype_Conformant => | |
19590d70 | 5251 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5252 | Error_Msg_N |
19590d70 GD |
5253 | ("not subtype conformant with operation inherited#!", |
5254 | Enode); | |
5255 | else | |
ed2233dc | 5256 | Error_Msg_N |
19590d70 GD |
5257 | ("not subtype conformant with declaration#!", Enode); |
5258 | end if; | |
996ae0b0 RK |
5259 | |
5260 | when Fully_Conformant => | |
19590d70 | 5261 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 5262 | Error_Msg_N -- CODEFIX |
19590d70 GD |
5263 | ("not fully conformant with operation inherited#!", |
5264 | Enode); | |
5265 | else | |
483c78cb | 5266 | Error_Msg_N -- CODEFIX |
19590d70 GD |
5267 | ("not fully conformant with declaration#!", Enode); |
5268 | end if; | |
996ae0b0 RK |
5269 | end case; |
5270 | ||
5271 | Error_Msg_NE (Msg, Enode, N); | |
5272 | end if; | |
5273 | end Conformance_Error; | |
5274 | ||
f991bd8e HK |
5275 | ----------------------- |
5276 | -- Conventions_Match -- | |
5277 | ----------------------- | |
5278 | ||
5279 | function Conventions_Match | |
5280 | (Id1 : Entity_Id; | |
5281 | Id2 : Entity_Id) return Boolean | |
5282 | is | |
5283 | begin | |
5284 | -- Ignore the conventions of anonymous access-to-subprogram types | |
5285 | -- and subprogram types because these are internally generated and | |
5286 | -- the only way these may receive a convention is if they inherit | |
5287 | -- the convention of a related subprogram. | |
5288 | ||
5289 | if Ekind_In (Id1, E_Anonymous_Access_Subprogram_Type, | |
5290 | E_Subprogram_Type) | |
5291 | or else | |
5292 | Ekind_In (Id2, E_Anonymous_Access_Subprogram_Type, | |
5293 | E_Subprogram_Type) | |
5294 | then | |
5295 | return True; | |
5296 | ||
5297 | -- Otherwise compare the conventions directly | |
5298 | ||
5299 | else | |
5300 | return Convention (Id1) = Convention (Id2); | |
5301 | end if; | |
5302 | end Conventions_Match; | |
5303 | ||
ec4867fa ES |
5304 | -- Local Variables |
5305 | ||
5306 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
5307 | New_Type : constant Entity_Id := Etype (New_Id); | |
5308 | Old_Formal : Entity_Id; | |
5309 | New_Formal : Entity_Id; | |
5310 | Access_Types_Match : Boolean; | |
5311 | Old_Formal_Base : Entity_Id; | |
5312 | New_Formal_Base : Entity_Id; | |
5313 | ||
996ae0b0 RK |
5314 | -- Start of processing for Check_Conformance |
5315 | ||
5316 | begin | |
5317 | Conforms := True; | |
5318 | ||
82c80734 RD |
5319 | -- We need a special case for operators, since they don't appear |
5320 | -- explicitly. | |
996ae0b0 RK |
5321 | |
5322 | if Ctype = Type_Conformant then | |
5323 | if Ekind (New_Id) = E_Operator | |
5324 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
5325 | then | |
5326 | return; | |
5327 | end if; | |
5328 | end if; | |
5329 | ||
5330 | -- If both are functions/operators, check return types conform | |
5331 | ||
5332 | if Old_Type /= Standard_Void_Type | |
3cb9a885 AC |
5333 | and then |
5334 | New_Type /= Standard_Void_Type | |
996ae0b0 | 5335 | then |
fceeaab6 ES |
5336 | -- If we are checking interface conformance we omit controlling |
5337 | -- arguments and result, because we are only checking the conformance | |
5338 | -- of the remaining parameters. | |
5339 | ||
5340 | if Has_Controlling_Result (Old_Id) | |
5341 | and then Has_Controlling_Result (New_Id) | |
5342 | and then Skip_Controlling_Formals | |
5343 | then | |
5344 | null; | |
5345 | ||
5346 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
7f568bfa AC |
5347 | if Ctype >= Subtype_Conformant |
5348 | and then not Predicates_Match (Old_Type, New_Type) | |
5349 | then | |
5350 | Conformance_Error | |
5351 | ("\predicate of return type does not match!", New_Id); | |
5352 | else | |
5353 | Conformance_Error | |
5354 | ("\return type does not match!", New_Id); | |
5355 | end if; | |
5356 | ||
996ae0b0 RK |
5357 | return; |
5358 | end if; | |
5359 | ||
41251c60 | 5360 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 5361 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 5362 | |
0791fbe9 | 5363 | if Ada_Version >= Ada_2005 |
41251c60 JM |
5364 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
5365 | and then | |
8fde064e AC |
5366 | (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
5367 | or else Is_Access_Constant (Etype (Old_Type)) /= | |
5368 | Is_Access_Constant (Etype (New_Type))) | |
41251c60 | 5369 | then |
5d37ba92 | 5370 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
5371 | return; |
5372 | end if; | |
5373 | ||
996ae0b0 RK |
5374 | -- If either is a function/operator and the other isn't, error |
5375 | ||
5376 | elsif Old_Type /= Standard_Void_Type | |
5377 | or else New_Type /= Standard_Void_Type | |
5378 | then | |
5d37ba92 | 5379 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
5380 | return; |
5381 | end if; | |
5382 | ||
0a36105d | 5383 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
5384 | -- If this is a renaming as body, refine error message to indicate that |
5385 | -- the conflict is with the original declaration. If the entity is not | |
5386 | -- frozen, the conventions don't have to match, the one of the renamed | |
5387 | -- entity is inherited. | |
5388 | ||
5389 | if Ctype >= Subtype_Conformant then | |
f991bd8e | 5390 | if not Conventions_Match (Old_Id, New_Id) then |
996ae0b0 RK |
5391 | if not Is_Frozen (New_Id) then |
5392 | null; | |
5393 | ||
5394 | elsif Present (Err_Loc) | |
5395 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
5396 | and then Present (Corresponding_Spec (Err_Loc)) | |
5397 | then | |
5398 | Error_Msg_Name_1 := Chars (New_Id); | |
5399 | Error_Msg_Name_2 := | |
5400 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 5401 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
5402 | |
5403 | else | |
5d37ba92 | 5404 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
5405 | end if; |
5406 | ||
5407 | return; | |
5408 | ||
5409 | elsif Is_Formal_Subprogram (Old_Id) | |
5410 | or else Is_Formal_Subprogram (New_Id) | |
90fa8613 | 5411 | or else (Is_Subprogram (New_Id) |
3d581777 HK |
5412 | and then Present (Alias (New_Id)) |
5413 | and then Is_Formal_Subprogram (Alias (New_Id))) | |
996ae0b0 | 5414 | then |
90fa8613 | 5415 | Conformance_Error |
3d581777 HK |
5416 | ("\formal subprograms are not subtype conformant " |
5417 | & "(RM 6.3.1 (17/3))"); | |
996ae0b0 RK |
5418 | end if; |
5419 | end if; | |
5420 | ||
5421 | -- Deal with parameters | |
5422 | ||
5423 | -- Note: we use the entity information, rather than going directly | |
5424 | -- to the specification in the tree. This is not only simpler, but | |
5425 | -- absolutely necessary for some cases of conformance tests between | |
a90bd866 | 5426 | -- operators, where the declaration tree simply does not exist. |
996ae0b0 RK |
5427 | |
5428 | Old_Formal := First_Formal (Old_Id); | |
5429 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 5430 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
5431 | if Is_Controlling_Formal (Old_Formal) |
5432 | and then Is_Controlling_Formal (New_Formal) | |
5433 | and then Skip_Controlling_Formals | |
5434 | then | |
a2dc5812 AC |
5435 | -- The controlling formals will have different types when |
5436 | -- comparing an interface operation with its match, but both | |
5437 | -- or neither must be access parameters. | |
5438 | ||
5439 | if Is_Access_Type (Etype (Old_Formal)) | |
5440 | = | |
5441 | Is_Access_Type (Etype (New_Formal)) | |
5442 | then | |
5443 | goto Skip_Controlling_Formal; | |
5444 | else | |
5445 | Conformance_Error | |
5446 | ("\access parameter does not match!", New_Formal); | |
5447 | end if; | |
41251c60 JM |
5448 | end if; |
5449 | ||
21791d97 | 5450 | -- Ada 2012: Mode conformance also requires that formal parameters |
2a290fec AC |
5451 | -- be both aliased, or neither. |
5452 | ||
21791d97 | 5453 | if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
2a290fec AC |
5454 | if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
5455 | Conformance_Error | |
5456 | ("\aliased parameter mismatch!", New_Formal); | |
5457 | end if; | |
5458 | end if; | |
5459 | ||
fbf5a39b AC |
5460 | if Ctype = Fully_Conformant then |
5461 | ||
5462 | -- Names must match. Error message is more accurate if we do | |
5463 | -- this before checking that the types of the formals match. | |
5464 | ||
5465 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
3ccedacc | 5466 | Conformance_Error ("\name& does not match!", New_Formal); |
fbf5a39b AC |
5467 | |
5468 | -- Set error posted flag on new formal as well to stop | |
5469 | -- junk cascaded messages in some cases. | |
5470 | ||
5471 | Set_Error_Posted (New_Formal); | |
5472 | return; | |
5473 | end if; | |
40b93859 RD |
5474 | |
5475 | -- Null exclusion must match | |
5476 | ||
5477 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
5478 | /= | |
5479 | Null_Exclusion_Present (Parent (New_Formal)) | |
5480 | then | |
5481 | -- Only give error if both come from source. This should be | |
5482 | -- investigated some time, since it should not be needed ??? | |
5483 | ||
5484 | if Comes_From_Source (Old_Formal) | |
5485 | and then | |
5486 | Comes_From_Source (New_Formal) | |
5487 | then | |
5488 | Conformance_Error | |
3ccedacc | 5489 | ("\null exclusion for& does not match", New_Formal); |
40b93859 RD |
5490 | |
5491 | -- Mark error posted on the new formal to avoid duplicated | |
5492 | -- complaint about types not matching. | |
5493 | ||
5494 | Set_Error_Posted (New_Formal); | |
5495 | end if; | |
5496 | end if; | |
fbf5a39b | 5497 | end if; |
996ae0b0 | 5498 | |
ec4867fa ES |
5499 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
5500 | -- case occurs whenever a subprogram is being renamed and one of its | |
5501 | -- parameters imposes a null exclusion. For example: | |
5502 | ||
5503 | -- type T is null record; | |
5504 | -- type Acc_T is access T; | |
5505 | -- subtype Acc_T_Sub is Acc_T; | |
5506 | ||
5507 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
5508 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
5509 | -- renames P; | |
5510 | ||
5511 | Old_Formal_Base := Etype (Old_Formal); | |
5512 | New_Formal_Base := Etype (New_Formal); | |
5513 | ||
5514 | if Get_Inst then | |
5515 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
5516 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
5517 | end if; | |
5518 | ||
0791fbe9 | 5519 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa | 5520 | |
8fde064e AC |
5521 | -- Ensure that this rule is only applied when New_Id is a |
5522 | -- renaming of Old_Id. | |
ec4867fa | 5523 | |
5d37ba92 ES |
5524 | and then Nkind (Parent (Parent (New_Id))) = |
5525 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
5526 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
5527 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
5528 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
5529 | ||
8fde064e | 5530 | -- Now handle the allowed access-type case |
ec4867fa ES |
5531 | |
5532 | and then Is_Access_Type (Old_Formal_Base) | |
5533 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 | 5534 | |
8fde064e AC |
5535 | -- The type kinds must match. The only exception occurs with |
5536 | -- multiple generics of the form: | |
5d37ba92 | 5537 | |
8fde064e AC |
5538 | -- generic generic |
5539 | -- type F is private; type A is private; | |
5540 | -- type F_Ptr is access F; type A_Ptr is access A; | |
5541 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
5542 | -- package F_Pack is ... package A_Pack is | |
5543 | -- package F_Inst is | |
5544 | -- new F_Pack (A, A_Ptr, A_P); | |
5d37ba92 | 5545 | |
8fde064e AC |
5546 | -- When checking for conformance between the parameters of A_P |
5547 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
5548 | -- because the compiler has transformed A_Ptr into a subtype of | |
5549 | -- F_Ptr. We catch this case in the code below. | |
5d37ba92 ES |
5550 | |
5551 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4b6f99f5 RD |
5552 | or else |
5553 | (Is_Generic_Type (Old_Formal_Base) | |
5554 | and then Is_Generic_Type (New_Formal_Base) | |
5555 | and then Is_Internal (New_Formal_Base) | |
5556 | and then Etype (Etype (New_Formal_Base)) = | |
5557 | Old_Formal_Base)) | |
5558 | and then Directly_Designated_Type (Old_Formal_Base) = | |
5559 | Directly_Designated_Type (New_Formal_Base) | |
ec4867fa ES |
5560 | and then ((Is_Itype (Old_Formal_Base) |
5561 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
4b6f99f5 RD |
5562 | or else |
5563 | (Is_Itype (New_Formal_Base) | |
5564 | and then Can_Never_Be_Null (New_Formal_Base))); | |
ec4867fa | 5565 | |
996ae0b0 RK |
5566 | -- Types must always match. In the visible part of an instance, |
5567 | -- usual overloading rules for dispatching operations apply, and | |
5568 | -- we check base types (not the actual subtypes). | |
5569 | ||
5570 | if In_Instance_Visible_Part | |
5571 | and then Is_Dispatching_Operation (New_Id) | |
5572 | then | |
5573 | if not Conforming_Types | |
ec4867fa ES |
5574 | (T1 => Base_Type (Etype (Old_Formal)), |
5575 | T2 => Base_Type (Etype (New_Formal)), | |
5576 | Ctype => Ctype, | |
5577 | Get_Inst => Get_Inst) | |
5578 | and then not Access_Types_Match | |
996ae0b0 | 5579 | then |
5d37ba92 | 5580 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
5581 | return; |
5582 | end if; | |
5583 | ||
5584 | elsif not Conforming_Types | |
5d37ba92 ES |
5585 | (T1 => Old_Formal_Base, |
5586 | T2 => New_Formal_Base, | |
ec4867fa ES |
5587 | Ctype => Ctype, |
5588 | Get_Inst => Get_Inst) | |
5589 | and then not Access_Types_Match | |
996ae0b0 | 5590 | then |
c27f2f15 RD |
5591 | -- Don't give error message if old type is Any_Type. This test |
5592 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
5593 | ||
5594 | if Errmsg and then Old_Formal_Base = Any_Type then | |
5595 | Conforms := False; | |
5596 | else | |
7f568bfa AC |
5597 | if Ctype >= Subtype_Conformant |
5598 | and then | |
5599 | not Predicates_Match (Old_Formal_Base, New_Formal_Base) | |
5600 | then | |
5601 | Conformance_Error | |
5602 | ("\predicate of & does not match!", New_Formal); | |
5603 | else | |
5604 | Conformance_Error | |
5605 | ("\type of & does not match!", New_Formal); | |
7738270b AC |
5606 | |
5607 | if not Dimensions_Match (Old_Formal_Base, New_Formal_Base) | |
5608 | then | |
5609 | Error_Msg_N ("\dimensions mismatch!", New_Formal); | |
5610 | end if; | |
7f568bfa | 5611 | end if; |
c27f2f15 RD |
5612 | end if; |
5613 | ||
996ae0b0 RK |
5614 | return; |
5615 | end if; | |
5616 | ||
5617 | -- For mode conformance, mode must match | |
5618 | ||
5d37ba92 ES |
5619 | if Ctype >= Mode_Conformant then |
5620 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
5621 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
5622 | or else not Is_Primitive_Wrapper (New_Id) | |
5623 | then | |
5624 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 5625 | |
dd54644b JM |
5626 | else |
5627 | declare | |
a2667f14 | 5628 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b | 5629 | begin |
3ccedacc | 5630 | if Is_Protected_Type (Corresponding_Concurrent_Type (T)) |
dd54644b | 5631 | then |
2c6336be | 5632 | Error_Msg_PT (New_Id, Ultimate_Alias (Old_Id)); |
dd54644b JM |
5633 | else |
5634 | Conformance_Error | |
5635 | ("\mode of & does not match!", New_Formal); | |
5636 | end if; | |
5637 | end; | |
5638 | end if; | |
5639 | ||
5d37ba92 ES |
5640 | return; |
5641 | ||
5642 | -- Part of mode conformance for access types is having the same | |
5643 | -- constant modifier. | |
5644 | ||
5645 | elsif Access_Types_Match | |
5646 | and then Is_Access_Constant (Old_Formal_Base) /= | |
5647 | Is_Access_Constant (New_Formal_Base) | |
5648 | then | |
5649 | Conformance_Error | |
5650 | ("\constant modifier does not match!", New_Formal); | |
5651 | return; | |
5652 | end if; | |
996ae0b0 RK |
5653 | end if; |
5654 | ||
0a36105d | 5655 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 5656 | |
0a36105d JM |
5657 | -- Ada 2005 (AI-231): In case of anonymous access types check |
5658 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
5659 | -- match. For null exclusion, we test the types rather than the |
5660 | -- formals themselves, since the attribute is only set reliably | |
5661 | -- on the formals in the Ada 95 case, and we exclude the case | |
5662 | -- where Old_Formal is marked as controlling, to avoid errors | |
5663 | -- when matching completing bodies with dispatching declarations | |
5664 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 5665 | |
0791fbe9 | 5666 | if Ada_Version >= Ada_2005 |
0a36105d JM |
5667 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
5668 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
5669 | and then | |
c7b9d548 AC |
5670 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
5671 | Can_Never_Be_Null (Etype (New_Formal)) | |
5672 | and then | |
5673 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
5674 | or else |
5675 | Is_Access_Constant (Etype (Old_Formal)) /= | |
5676 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
5677 | |
5678 | -- Do not complain if error already posted on New_Formal. This | |
5679 | -- avoids some redundant error messages. | |
5680 | ||
5681 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
5682 | then |
5683 | -- It is allowed to omit the null-exclusion in case of stream | |
5684 | -- attribute subprograms. We recognize stream subprograms | |
5685 | -- through their TSS-generated suffix. | |
996ae0b0 | 5686 | |
0a36105d JM |
5687 | declare |
5688 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
3ada950b | 5689 | |
0a36105d JM |
5690 | begin |
5691 | if TSS_Name /= TSS_Stream_Read | |
5692 | and then TSS_Name /= TSS_Stream_Write | |
5693 | and then TSS_Name /= TSS_Stream_Input | |
5694 | and then TSS_Name /= TSS_Stream_Output | |
5695 | then | |
3ada950b | 5696 | -- Here we have a definite conformance error. It is worth |
71fb4dc8 | 5697 | -- special casing the error message for the case of a |
3ada950b AC |
5698 | -- controlling formal (which excludes null). |
5699 | ||
5700 | if Is_Controlling_Formal (New_Formal) then | |
5701 | Error_Msg_Node_2 := Scope (New_Formal); | |
5702 | Conformance_Error | |
3ccedacc AC |
5703 | ("\controlling formal & of & excludes null, " |
5704 | & "declaration must exclude null as well", | |
5705 | New_Formal); | |
3ada950b AC |
5706 | |
5707 | -- Normal case (couldn't we give more detail here???) | |
5708 | ||
5709 | else | |
5710 | Conformance_Error | |
5711 | ("\type of & does not match!", New_Formal); | |
5712 | end if; | |
5713 | ||
0a36105d JM |
5714 | return; |
5715 | end if; | |
5716 | end; | |
5717 | end if; | |
5718 | end if; | |
41251c60 | 5719 | |
0a36105d | 5720 | -- Full conformance checks |
41251c60 | 5721 | |
0a36105d | 5722 | if Ctype = Fully_Conformant then |
e660dbf7 | 5723 | |
0a36105d | 5724 | -- We have checked already that names match |
e660dbf7 | 5725 | |
0a36105d | 5726 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
5727 | |
5728 | -- Check default expressions for in parameters | |
5729 | ||
996ae0b0 RK |
5730 | declare |
5731 | NewD : constant Boolean := | |
5732 | Present (Default_Value (New_Formal)); | |
5733 | OldD : constant Boolean := | |
5734 | Present (Default_Value (Old_Formal)); | |
5735 | begin | |
5736 | if NewD or OldD then | |
5737 | ||
82c80734 RD |
5738 | -- The old default value has been analyzed because the |
5739 | -- current full declaration will have frozen everything | |
0a36105d JM |
5740 | -- before. The new default value has not been analyzed, |
5741 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
5742 | |
5743 | if NewD then | |
0a36105d | 5744 | Push_Scope (New_Id); |
21d27997 | 5745 | Preanalyze_Spec_Expression |
fbf5a39b | 5746 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
5747 | End_Scope; |
5748 | end if; | |
5749 | ||
5750 | if not (NewD and OldD) | |
5751 | or else not Fully_Conformant_Expressions | |
5752 | (Default_Value (Old_Formal), | |
5753 | Default_Value (New_Formal)) | |
5754 | then | |
5755 | Conformance_Error | |
5d37ba92 | 5756 | ("\default expression for & does not match!", |
996ae0b0 RK |
5757 | New_Formal); |
5758 | return; | |
5759 | end if; | |
5760 | end if; | |
5761 | end; | |
5762 | end if; | |
5763 | end if; | |
5764 | ||
5765 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 5766 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
5767 | -- or if either old or new instance is not from the source program. |
5768 | ||
0ab80019 | 5769 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5770 | and then Sloc (Old_Id) > Standard_Location |
5771 | and then Sloc (New_Id) > Standard_Location | |
5772 | and then Comes_From_Source (Old_Id) | |
5773 | and then Comes_From_Source (New_Id) | |
5774 | then | |
5775 | declare | |
5776 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
5777 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
5778 | ||
5779 | begin | |
5780 | -- Explicit IN must be present or absent in both cases. This | |
5781 | -- test is required only in the full conformance case. | |
5782 | ||
5783 | if In_Present (Old_Param) /= In_Present (New_Param) | |
5784 | and then Ctype = Fully_Conformant | |
5785 | then | |
5786 | Conformance_Error | |
5d37ba92 | 5787 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
5788 | New_Formal); |
5789 | return; | |
5790 | end if; | |
5791 | ||
5792 | -- Grouping (use of comma in param lists) must be the same | |
5793 | -- This is where we catch a misconformance like: | |
5794 | ||
0a36105d | 5795 | -- A, B : Integer |
996ae0b0 RK |
5796 | -- A : Integer; B : Integer |
5797 | ||
5798 | -- which are represented identically in the tree except | |
5799 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5800 | ||
5801 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
5802 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
5803 | then | |
5804 | Conformance_Error | |
5d37ba92 | 5805 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
5806 | return; |
5807 | end if; | |
5808 | end; | |
5809 | end if; | |
5810 | ||
41251c60 JM |
5811 | -- This label is required when skipping controlling formals |
5812 | ||
5813 | <<Skip_Controlling_Formal>> | |
5814 | ||
996ae0b0 RK |
5815 | Next_Formal (Old_Formal); |
5816 | Next_Formal (New_Formal); | |
5817 | end loop; | |
5818 | ||
5819 | if Present (Old_Formal) then | |
5d37ba92 | 5820 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
5821 | return; |
5822 | ||
5823 | elsif Present (New_Formal) then | |
5d37ba92 | 5824 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
5825 | return; |
5826 | end if; | |
996ae0b0 RK |
5827 | end Check_Conformance; |
5828 | ||
ec4867fa ES |
5829 | ----------------------- |
5830 | -- Check_Conventions -- | |
5831 | ----------------------- | |
5832 | ||
5833 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 5834 | Ifaces_List : Elist_Id; |
0a36105d | 5835 | |
ce2b6ba5 | 5836 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
5837 | -- Verify that the convention of inherited dispatching operation Op is |
5838 | -- consistent among all subprograms it overrides. In order to minimize | |
5839 | -- the search, Search_From is utilized to designate a specific point in | |
5840 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
5841 | |
5842 | ---------------------- | |
5843 | -- Check_Convention -- | |
5844 | ---------------------- | |
5845 | ||
ce2b6ba5 | 5846 | procedure Check_Convention (Op : Entity_Id) is |
c5cec2fe | 5847 | Op_Conv : constant Convention_Id := Convention (Op); |
9f6aaa5c | 5848 | Iface_Conv : Convention_Id; |
ce2b6ba5 JM |
5849 | Iface_Elmt : Elmt_Id; |
5850 | Iface_Prim_Elmt : Elmt_Id; | |
5851 | Iface_Prim : Entity_Id; | |
ec4867fa | 5852 | |
ce2b6ba5 JM |
5853 | begin |
5854 | Iface_Elmt := First_Elmt (Ifaces_List); | |
5855 | while Present (Iface_Elmt) loop | |
5856 | Iface_Prim_Elmt := | |
9f6aaa5c | 5857 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
ce2b6ba5 JM |
5858 | while Present (Iface_Prim_Elmt) loop |
5859 | Iface_Prim := Node (Iface_Prim_Elmt); | |
c5cec2fe | 5860 | Iface_Conv := Convention (Iface_Prim); |
ce2b6ba5 JM |
5861 | |
5862 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
9f6aaa5c | 5863 | and then Iface_Conv /= Op_Conv |
ce2b6ba5 | 5864 | then |
ed2233dc | 5865 | Error_Msg_N |
ce2b6ba5 | 5866 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 5867 | |
ce2b6ba5 | 5868 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c | 5869 | Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
ce2b6ba5 | 5870 | Error_Msg_Sloc := Sloc (Op); |
ec4867fa | 5871 | |
7a963087 | 5872 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 5873 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 5874 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 5875 | else |
ed2233dc | 5876 | Error_Msg_N |
3ccedacc AC |
5877 | ("\\overriding operation % with " |
5878 | & "convention % defined #", Typ); | |
ce2b6ba5 | 5879 | end if; |
ec4867fa | 5880 | |
ce2b6ba5 JM |
5881 | else pragma Assert (Present (Alias (Op))); |
5882 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
3ccedacc AC |
5883 | Error_Msg_N ("\\inherited operation % with " |
5884 | & "convention % defined #", Typ); | |
ce2b6ba5 | 5885 | end if; |
ec4867fa | 5886 | |
ce2b6ba5 | 5887 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c AC |
5888 | Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
5889 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
3ccedacc AC |
5890 | Error_Msg_N ("\\overridden operation % with " |
5891 | & "convention % defined #", Typ); | |
ec4867fa | 5892 | |
ce2b6ba5 | 5893 | -- Avoid cascading errors |
ec4867fa | 5894 | |
ce2b6ba5 JM |
5895 | return; |
5896 | end if; | |
ec4867fa | 5897 | |
ce2b6ba5 JM |
5898 | Next_Elmt (Iface_Prim_Elmt); |
5899 | end loop; | |
ec4867fa | 5900 | |
ce2b6ba5 | 5901 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
5902 | end loop; |
5903 | end Check_Convention; | |
5904 | ||
5905 | -- Local variables | |
5906 | ||
5907 | Prim_Op : Entity_Id; | |
5908 | Prim_Op_Elmt : Elmt_Id; | |
5909 | ||
5910 | -- Start of processing for Check_Conventions | |
5911 | ||
5912 | begin | |
ce2b6ba5 JM |
5913 | if not Has_Interfaces (Typ) then |
5914 | return; | |
5915 | end if; | |
5916 | ||
5917 | Collect_Interfaces (Typ, Ifaces_List); | |
5918 | ||
0a36105d JM |
5919 | -- The algorithm checks every overriding dispatching operation against |
5920 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 5921 | -- differences in conventions. |
ec4867fa ES |
5922 | |
5923 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
5924 | while Present (Prim_Op_Elmt) loop | |
5925 | Prim_Op := Node (Prim_Op_Elmt); | |
5926 | ||
0a36105d | 5927 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 5928 | -- since they always have the same convention. |
ec4867fa | 5929 | |
ce2b6ba5 JM |
5930 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
5931 | Check_Convention (Prim_Op); | |
ec4867fa ES |
5932 | end if; |
5933 | ||
5934 | Next_Elmt (Prim_Op_Elmt); | |
5935 | end loop; | |
5936 | end Check_Conventions; | |
5937 | ||
996ae0b0 RK |
5938 | ------------------------------ |
5939 | -- Check_Delayed_Subprogram -- | |
5940 | ------------------------------ | |
5941 | ||
5942 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
996ae0b0 | 5943 | procedure Possible_Freeze (T : Entity_Id); |
fc47ef60 PMR |
5944 | -- T is the type of either a formal parameter or of the return type. If |
5945 | -- T is not yet frozen and needs a delayed freeze, then the subprogram | |
5946 | -- itself must be delayed. | |
996ae0b0 | 5947 | |
82c80734 RD |
5948 | --------------------- |
5949 | -- Possible_Freeze -- | |
5950 | --------------------- | |
5951 | ||
996ae0b0 | 5952 | procedure Possible_Freeze (T : Entity_Id) is |
c581c520 | 5953 | Scop : constant Entity_Id := Scope (Designator); |
fc47ef60 | 5954 | |
996ae0b0 | 5955 | begin |
fc47ef60 PMR |
5956 | -- If the subprogram appears within a package instance (which may be |
5957 | -- the wrapper package of a subprogram instance) the freeze node for | |
5958 | -- that package will freeze the subprogram at the proper place, so | |
5959 | -- do not emit a freeze node for the subprogram, given that it may | |
5960 | -- appear in the wrong scope. | |
c581c520 PMR |
5961 | |
5962 | if Ekind (Scop) = E_Package | |
5963 | and then not Comes_From_Source (Scop) | |
5964 | and then Is_Generic_Instance (Scop) | |
5965 | then | |
5966 | null; | |
5967 | ||
5968 | elsif Has_Delayed_Freeze (T) and then not Is_Frozen (T) then | |
996ae0b0 RK |
5969 | Set_Has_Delayed_Freeze (Designator); |
5970 | ||
5971 | elsif Is_Access_Type (T) | |
5972 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
5973 | and then not Is_Frozen (Designated_Type (T)) | |
5974 | then | |
5975 | Set_Has_Delayed_Freeze (Designator); | |
5976 | end if; | |
5977 | end Possible_Freeze; | |
5978 | ||
fc47ef60 PMR |
5979 | -- Local variables |
5980 | ||
5981 | F : Entity_Id; | |
5982 | ||
996ae0b0 RK |
5983 | -- Start of processing for Check_Delayed_Subprogram |
5984 | ||
5985 | begin | |
76e3504f AC |
5986 | -- All subprograms, including abstract subprograms, may need a freeze |
5987 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 5988 | |
76e3504f AC |
5989 | Possible_Freeze (Etype (Designator)); |
5990 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 5991 | |
fc47ef60 PMR |
5992 | -- Need delayed freeze if any of the formal types themselves need a |
5993 | -- delayed freeze and are not yet frozen. | |
996ae0b0 | 5994 | |
76e3504f AC |
5995 | F := First_Formal (Designator); |
5996 | while Present (F) loop | |
5997 | Possible_Freeze (Etype (F)); | |
5998 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
5999 | Next_Formal (F); | |
6000 | end loop; | |
996ae0b0 | 6001 | |
fc47ef60 PMR |
6002 | -- Mark functions that return by reference. Note that it cannot be done |
6003 | -- for delayed_freeze subprograms because the underlying returned type | |
6004 | -- may not be known yet (for private types). | |
996ae0b0 | 6005 | |
8fde064e | 6006 | if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
996ae0b0 RK |
6007 | declare |
6008 | Typ : constant Entity_Id := Etype (Designator); | |
6009 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
fc47ef60 | 6010 | |
996ae0b0 | 6011 | begin |
51245e2d | 6012 | if Is_Limited_View (Typ) then |
996ae0b0 | 6013 | Set_Returns_By_Ref (Designator); |
fc47ef60 | 6014 | |
048e5cef | 6015 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
6016 | Set_Returns_By_Ref (Designator); |
6017 | end if; | |
6018 | end; | |
6019 | end if; | |
6020 | end Check_Delayed_Subprogram; | |
6021 | ||
6022 | ------------------------------------ | |
6023 | -- Check_Discriminant_Conformance -- | |
6024 | ------------------------------------ | |
6025 | ||
6026 | procedure Check_Discriminant_Conformance | |
6027 | (N : Node_Id; | |
6028 | Prev : Entity_Id; | |
6029 | Prev_Loc : Node_Id) | |
6030 | is | |
6031 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
6032 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
6033 | New_Discr_Id : Entity_Id; | |
6034 | New_Discr_Type : Entity_Id; | |
6035 | ||
6036 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
6037 | -- Post error message for conformance error on given node. Two messages |
6038 | -- are output. The first points to the previous declaration with a | |
6039 | -- general "no conformance" message. The second is the detailed reason, | |
6040 | -- supplied as Msg. The parameter N provide information for a possible | |
6041 | -- & insertion in the message. | |
996ae0b0 RK |
6042 | |
6043 | ----------------------- | |
6044 | -- Conformance_Error -- | |
6045 | ----------------------- | |
6046 | ||
6047 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
6048 | begin | |
6049 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
6050 | Error_Msg_N -- CODEFIX |
6051 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
6052 | Error_Msg_NE (Msg, N, N); |
6053 | end Conformance_Error; | |
6054 | ||
6055 | -- Start of processing for Check_Discriminant_Conformance | |
6056 | ||
6057 | begin | |
6058 | while Present (Old_Discr) and then Present (New_Discr) loop | |
996ae0b0 RK |
6059 | New_Discr_Id := Defining_Identifier (New_Discr); |
6060 | ||
82c80734 RD |
6061 | -- The subtype mark of the discriminant on the full type has not |
6062 | -- been analyzed so we do it here. For an access discriminant a new | |
6063 | -- type is created. | |
996ae0b0 RK |
6064 | |
6065 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
6066 | New_Discr_Type := | |
6067 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
6068 | ||
6069 | else | |
6070 | Analyze (Discriminant_Type (New_Discr)); | |
6071 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
6072 | |
6073 | -- Ada 2005: if the discriminant definition carries a null | |
6074 | -- exclusion, create an itype to check properly for consistency | |
6075 | -- with partial declaration. | |
6076 | ||
6077 | if Is_Access_Type (New_Discr_Type) | |
8fde064e | 6078 | and then Null_Exclusion_Present (New_Discr) |
e50e1c5e AC |
6079 | then |
6080 | New_Discr_Type := | |
6081 | Create_Null_Excluding_Itype | |
6082 | (T => New_Discr_Type, | |
6083 | Related_Nod => New_Discr, | |
6084 | Scope_Id => Current_Scope); | |
6085 | end if; | |
996ae0b0 RK |
6086 | end if; |
6087 | ||
6088 | if not Conforming_Types | |
6089 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
6090 | then | |
6091 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
6092 | return; | |
fbf5a39b | 6093 | else |
82c80734 RD |
6094 | -- Treat the new discriminant as an occurrence of the old one, |
6095 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
6096 | -- information, for completeness. |
6097 | ||
6098 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
6099 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
6100 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
6101 | end if; |
6102 | ||
6103 | -- Names must match | |
6104 | ||
6105 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
6106 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
6107 | return; | |
6108 | end if; | |
6109 | ||
6110 | -- Default expressions must match | |
6111 | ||
6112 | declare | |
6113 | NewD : constant Boolean := | |
6114 | Present (Expression (New_Discr)); | |
6115 | OldD : constant Boolean := | |
6116 | Present (Expression (Parent (Old_Discr))); | |
6117 | ||
6118 | begin | |
6119 | if NewD or OldD then | |
6120 | ||
6121 | -- The old default value has been analyzed and expanded, | |
6122 | -- because the current full declaration will have frozen | |
82c80734 RD |
6123 | -- everything before. The new default values have not been |
6124 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
6125 | |
6126 | if NewD then | |
21d27997 | 6127 | Preanalyze_Spec_Expression |
996ae0b0 RK |
6128 | (Expression (New_Discr), New_Discr_Type); |
6129 | end if; | |
6130 | ||
6131 | if not (NewD and OldD) | |
6132 | or else not Fully_Conformant_Expressions | |
6133 | (Expression (Parent (Old_Discr)), | |
6134 | Expression (New_Discr)) | |
6135 | ||
6136 | then | |
6137 | Conformance_Error | |
6138 | ("default expression for & does not match!", | |
6139 | New_Discr_Id); | |
6140 | return; | |
6141 | end if; | |
6142 | end if; | |
6143 | end; | |
6144 | ||
6145 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
6146 | ||
0ab80019 | 6147 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
6148 | declare |
6149 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
6150 | ||
6151 | begin | |
6152 | -- Grouping (use of comma in param lists) must be the same | |
6153 | -- This is where we catch a misconformance like: | |
6154 | ||
60370fb1 | 6155 | -- A, B : Integer |
996ae0b0 RK |
6156 | -- A : Integer; B : Integer |
6157 | ||
6158 | -- which are represented identically in the tree except | |
6159 | -- for the setting of the flags More_Ids and Prev_Ids. | |
6160 | ||
6161 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
6162 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
6163 | then | |
6164 | Conformance_Error | |
6165 | ("grouping of & does not match!", New_Discr_Id); | |
6166 | return; | |
6167 | end if; | |
6168 | end; | |
6169 | end if; | |
6170 | ||
6171 | Next_Discriminant (Old_Discr); | |
6172 | Next (New_Discr); | |
6173 | end loop; | |
6174 | ||
6175 | if Present (Old_Discr) then | |
6176 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
6177 | return; | |
6178 | ||
6179 | elsif Present (New_Discr) then | |
6180 | Conformance_Error | |
6181 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
6182 | return; | |
6183 | end if; | |
6184 | end Check_Discriminant_Conformance; | |
6185 | ||
6186 | ---------------------------- | |
6187 | -- Check_Fully_Conformant -- | |
6188 | ---------------------------- | |
6189 | ||
6190 | procedure Check_Fully_Conformant | |
6191 | (New_Id : Entity_Id; | |
6192 | Old_Id : Entity_Id; | |
6193 | Err_Loc : Node_Id := Empty) | |
6194 | is | |
6195 | Result : Boolean; | |
81db9d77 | 6196 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6197 | begin |
6198 | Check_Conformance | |
6199 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
6200 | end Check_Fully_Conformant; | |
6201 | ||
b420ba79 AC |
6202 | -------------------------- |
6203 | -- Check_Limited_Return -- | |
6204 | -------------------------- | |
6205 | ||
6206 | procedure Check_Limited_Return | |
6207 | (N : Node_Id; | |
6208 | Expr : Node_Id; | |
6209 | R_Type : Entity_Id) | |
6210 | is | |
6211 | begin | |
6212 | -- Ada 2005 (AI-318-02): Return-by-reference types have been removed and | |
6213 | -- replaced by anonymous access results. This is an incompatibility with | |
6214 | -- Ada 95. Not clear whether this should be enforced yet or perhaps | |
6215 | -- controllable with special switch. ??? | |
6216 | ||
6217 | -- A limited interface that is not immutably limited is OK | |
6218 | ||
6219 | if Is_Limited_Interface (R_Type) | |
6220 | and then | |
6221 | not (Is_Task_Interface (R_Type) | |
6222 | or else Is_Protected_Interface (R_Type) | |
6223 | or else Is_Synchronized_Interface (R_Type)) | |
6224 | then | |
6225 | null; | |
6226 | ||
6227 | elsif Is_Limited_Type (R_Type) | |
6228 | and then not Is_Interface (R_Type) | |
6229 | and then Comes_From_Source (N) | |
6230 | and then not In_Instance_Body | |
6231 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) | |
6232 | then | |
6233 | -- Error in Ada 2005 | |
6234 | ||
6235 | if Ada_Version >= Ada_2005 | |
6236 | and then not Debug_Flag_Dot_L | |
6237 | and then not GNAT_Mode | |
6238 | then | |
6239 | Error_Msg_N | |
6240 | ("(Ada 2005) cannot copy object of a limited type " | |
6241 | & "(RM-2005 6.5(5.5/2))", Expr); | |
6242 | ||
6243 | if Is_Limited_View (R_Type) then | |
6244 | Error_Msg_N | |
6245 | ("\return by reference not permitted in Ada 2005", Expr); | |
6246 | end if; | |
6247 | ||
6248 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
6249 | -- incompatibility. | |
6250 | ||
6251 | -- In GNAT mode, this is just a warning, to allow it to be evilly | |
6252 | -- turned off. Otherwise it is a real error. | |
6253 | ||
6254 | -- In a generic context, simplify the warning because it makes no | |
6255 | -- sense to discuss pass-by-reference or copy. | |
6256 | ||
6257 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then | |
6258 | if Inside_A_Generic then | |
6259 | Error_Msg_N | |
6260 | ("return of limited object not permitted in Ada 2005 " | |
6261 | & "(RM-2005 6.5(5.5/2))?y?", Expr); | |
6262 | ||
6263 | elsif Is_Limited_View (R_Type) then | |
6264 | Error_Msg_N | |
6265 | ("return by reference not permitted in Ada 2005 " | |
6266 | & "(RM-2005 6.5(5.5/2))?y?", Expr); | |
6267 | else | |
6268 | Error_Msg_N | |
6269 | ("cannot copy object of a limited type in Ada 2005 " | |
6270 | & "(RM-2005 6.5(5.5/2))?y?", Expr); | |
6271 | end if; | |
6272 | ||
99bba92c | 6273 | -- Ada 95 mode, and compatibility warnings disabled |
b420ba79 AC |
6274 | |
6275 | else | |
99bba92c AC |
6276 | pragma Assert (Ada_Version <= Ada_95); |
6277 | pragma Assert (not (Warn_On_Ada_2005_Compatibility or GNAT_Mode)); | |
b420ba79 AC |
6278 | return; -- skip continuation messages below |
6279 | end if; | |
6280 | ||
6281 | if not Inside_A_Generic then | |
6282 | Error_Msg_N | |
6283 | ("\consider switching to return of access type", Expr); | |
6284 | Explain_Limited_Type (R_Type, Expr); | |
6285 | end if; | |
6286 | end if; | |
6287 | end Check_Limited_Return; | |
6288 | ||
996ae0b0 RK |
6289 | --------------------------- |
6290 | -- Check_Mode_Conformant -- | |
6291 | --------------------------- | |
6292 | ||
6293 | procedure Check_Mode_Conformant | |
6294 | (New_Id : Entity_Id; | |
6295 | Old_Id : Entity_Id; | |
6296 | Err_Loc : Node_Id := Empty; | |
6297 | Get_Inst : Boolean := False) | |
6298 | is | |
6299 | Result : Boolean; | |
81db9d77 | 6300 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6301 | begin |
6302 | Check_Conformance | |
6303 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
6304 | end Check_Mode_Conformant; | |
6305 | ||
fbf5a39b | 6306 | -------------------------------- |
758c442c | 6307 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
6308 | -------------------------------- |
6309 | ||
758c442c | 6310 | procedure Check_Overriding_Indicator |
ec4867fa | 6311 | (Subp : Entity_Id; |
5d37ba92 ES |
6312 | Overridden_Subp : Entity_Id; |
6313 | Is_Primitive : Boolean) | |
fbf5a39b | 6314 | is |
758c442c GD |
6315 | Decl : Node_Id; |
6316 | Spec : Node_Id; | |
fbf5a39b AC |
6317 | |
6318 | begin | |
ec4867fa | 6319 | -- No overriding indicator for literals |
fbf5a39b | 6320 | |
ec4867fa | 6321 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 6322 | return; |
fbf5a39b | 6323 | |
ec4867fa ES |
6324 | elsif Ekind (Subp) = E_Entry then |
6325 | Decl := Parent (Subp); | |
6326 | ||
53b10ce9 AC |
6327 | -- No point in analyzing a malformed operator |
6328 | ||
6329 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
6330 | and then Error_Posted (Subp) | |
6331 | then | |
6332 | return; | |
6333 | ||
758c442c GD |
6334 | else |
6335 | Decl := Unit_Declaration_Node (Subp); | |
6336 | end if; | |
fbf5a39b | 6337 | |
800621e0 RD |
6338 | if Nkind_In (Decl, N_Subprogram_Body, |
6339 | N_Subprogram_Body_Stub, | |
6340 | N_Subprogram_Declaration, | |
6341 | N_Abstract_Subprogram_Declaration, | |
6342 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
6343 | then |
6344 | Spec := Specification (Decl); | |
ec4867fa ES |
6345 | |
6346 | elsif Nkind (Decl) = N_Entry_Declaration then | |
6347 | Spec := Decl; | |
6348 | ||
758c442c GD |
6349 | else |
6350 | return; | |
6351 | end if; | |
fbf5a39b | 6352 | |
e7d72fb9 AC |
6353 | -- The overriding operation is type conformant with the overridden one, |
6354 | -- but the names of the formals are not required to match. If the names | |
6823270c | 6355 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
6356 | -- source of confusion that is worth diagnosing. Controlling formals |
6357 | -- often carry names that reflect the type, and it is not worthwhile | |
6358 | -- requiring that their names match. | |
6359 | ||
c9e7bd8e | 6360 | if Present (Overridden_Subp) |
e7d72fb9 AC |
6361 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
6362 | then | |
6363 | declare | |
6364 | Form1 : Entity_Id; | |
6365 | Form2 : Entity_Id; | |
6366 | ||
6367 | begin | |
6368 | Form1 := First_Formal (Subp); | |
6369 | Form2 := First_Formal (Overridden_Subp); | |
6370 | ||
c9e7bd8e AC |
6371 | -- If the overriding operation is a synchronized operation, skip |
6372 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
6373 | -- implicit in the new one. If the operation is declared in the |
6374 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 6375 | |
6823270c AC |
6376 | if Is_Concurrent_Type (Scope (Subp)) |
6377 | and then Is_Tagged_Type (Scope (Subp)) | |
6378 | and then not Has_Completion (Scope (Subp)) | |
6379 | then | |
c9e7bd8e AC |
6380 | Form2 := Next_Formal (Form2); |
6381 | end if; | |
6382 | ||
e7d72fb9 AC |
6383 | if Present (Form1) then |
6384 | Form1 := Next_Formal (Form1); | |
6385 | Form2 := Next_Formal (Form2); | |
6386 | end if; | |
6387 | ||
6388 | while Present (Form1) loop | |
6389 | if not Is_Controlling_Formal (Form1) | |
6390 | and then Present (Next_Formal (Form2)) | |
6391 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
6392 | then | |
6393 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
6394 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 6395 | Error_Msg_NE |
19d846a0 | 6396 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
6397 | Form1, Form1); |
6398 | exit; | |
6399 | end if; | |
6400 | ||
6401 | Next_Formal (Form1); | |
6402 | Next_Formal (Form2); | |
6403 | end loop; | |
6404 | end; | |
6405 | end if; | |
6406 | ||
676e8420 AC |
6407 | -- If there is an overridden subprogram, then check that there is no |
6408 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
6409 | -- This is not done if the overridden subprogram is marked as hidden, |
6410 | -- which can occur for the case of inherited controlled operations | |
6411 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
6412 | -- subprogram is not itself hidden. (Note: This condition could probably | |
6413 | -- be simplified, leaving out the testing for the specific controlled | |
6414 | -- cases, but it seems safer and clearer this way, and echoes similar | |
6415 | -- special-case tests of this kind in other places.) | |
6416 | ||
fd0d899b | 6417 | if Present (Overridden_Subp) |
51bf9bdf AC |
6418 | and then (not Is_Hidden (Overridden_Subp) |
6419 | or else | |
b69cd36a AC |
6420 | (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
6421 | Name_Adjust, | |
6422 | Name_Finalize) | |
f0709ca6 AC |
6423 | and then Present (Alias (Overridden_Subp)) |
6424 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 6425 | then |
ec4867fa ES |
6426 | if Must_Not_Override (Spec) then |
6427 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 6428 | |
ec4867fa | 6429 | if Ekind (Subp) = E_Entry then |
ed2233dc | 6430 | Error_Msg_NE |
5d37ba92 | 6431 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 6432 | else |
ed2233dc | 6433 | Error_Msg_NE |
5d37ba92 | 6434 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 6435 | end if; |
21d27997 | 6436 | |
bd603506 | 6437 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
6438 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
6439 | -- operation. This operation should not be inherited by other limited | |
6440 | -- controlled types. An explicit Adjust for them is not overriding. | |
6441 | ||
6442 | elsif Must_Override (Spec) | |
6443 | and then Chars (Overridden_Subp) = Name_Adjust | |
6444 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
6445 | and then Present (Alias (Overridden_Subp)) | |
8ab31c0c | 6446 | and then In_Predefined_Unit (Alias (Overridden_Subp)) |
24a120ac | 6447 | then |
b043ae01 AC |
6448 | Get_Name_String |
6449 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))); | |
24a120ac AC |
6450 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
6451 | ||
21d27997 | 6452 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
6453 | if Is_Init_Proc (Subp) then |
6454 | null; | |
6455 | ||
6456 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
6457 | |
6458 | -- For entities generated by Derive_Subprograms the overridden | |
6459 | -- operation is the inherited primitive (which is available | |
6460 | -- through the attribute alias) | |
6461 | ||
6462 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 6463 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 6464 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
6465 | and then Find_Dispatching_Type (Overridden_Subp) = |
6466 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
6467 | and then Present (Alias (Overridden_Subp)) |
6468 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
6469 | then | |
039538bc AC |
6470 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); |
6471 | Inherit_Subprogram_Contract (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 6472 | |
1c1289e7 | 6473 | else |
039538bc AC |
6474 | Set_Overridden_Operation (Subp, Overridden_Subp); |
6475 | Inherit_Subprogram_Contract (Subp, Overridden_Subp); | |
1c1289e7 AC |
6476 | end if; |
6477 | end if; | |
ec4867fa | 6478 | end if; |
f937473f | 6479 | |
618fb570 AC |
6480 | -- If primitive flag is set or this is a protected operation, then |
6481 | -- the operation is overriding at the point of its declaration, so | |
6482 | -- warn if necessary. Otherwise it may have been declared before the | |
6483 | -- operation it overrides and no check is required. | |
3c25856a AC |
6484 | |
6485 | if Style_Check | |
618fb570 AC |
6486 | and then not Must_Override (Spec) |
6487 | and then (Is_Primitive | |
6488 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 6489 | then |
235f4375 AC |
6490 | Style.Missing_Overriding (Decl, Subp); |
6491 | end if; | |
6492 | ||
53b10ce9 AC |
6493 | -- If Subp is an operator, it may override a predefined operation, if |
6494 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 6495 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
6496 | -- representation for predefined operators. We have to check whether the |
6497 | -- signature of Subp matches that of a predefined operator. Note that | |
6498 | -- first argument provides the name of the operator, and the second | |
6499 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
6500 | -- If the indicator is overriding, then the operator must match a |
6501 | -- predefined signature, because we know already that there is no | |
6502 | -- explicit overridden operation. | |
f937473f | 6503 | |
21d27997 | 6504 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 6505 | if Must_Not_Override (Spec) then |
f937473f | 6506 | |
806f6d37 AC |
6507 | -- If this is not a primitive or a protected subprogram, then |
6508 | -- "not overriding" is illegal. | |
618fb570 | 6509 | |
806f6d37 AC |
6510 | if not Is_Primitive |
6511 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
6512 | then | |
3ccedacc AC |
6513 | Error_Msg_N ("overriding indicator only allowed " |
6514 | & "if subprogram is primitive", Subp); | |
618fb570 | 6515 | |
806f6d37 AC |
6516 | elsif Can_Override_Operator (Subp) then |
6517 | Error_Msg_NE | |
6518 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
6519 | end if; | |
f937473f | 6520 | |
806f6d37 AC |
6521 | elsif Must_Override (Spec) then |
6522 | if No (Overridden_Operation (Subp)) | |
6523 | and then not Can_Override_Operator (Subp) | |
6524 | then | |
6525 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
6526 | end if; | |
5d37ba92 | 6527 | |
806f6d37 AC |
6528 | elsif not Error_Posted (Subp) |
6529 | and then Style_Check | |
6530 | and then Can_Override_Operator (Subp) | |
8ab31c0c | 6531 | and then not In_Predefined_Unit (Subp) |
806f6d37 AC |
6532 | then |
6533 | -- If style checks are enabled, indicate that the indicator is | |
6534 | -- missing. However, at the point of declaration, the type of | |
6535 | -- which this is a primitive operation may be private, in which | |
6536 | -- case the indicator would be premature. | |
235f4375 | 6537 | |
806f6d37 AC |
6538 | if Has_Private_Declaration (Etype (Subp)) |
6539 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 6540 | then |
806f6d37 AC |
6541 | null; |
6542 | else | |
6543 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 6544 | end if; |
806f6d37 | 6545 | end if; |
21d27997 RD |
6546 | |
6547 | elsif Must_Override (Spec) then | |
6548 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 6549 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 6550 | else |
ed2233dc | 6551 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 6552 | end if; |
5d37ba92 ES |
6553 | |
6554 | -- If the operation is marked "not overriding" and it's not primitive | |
6555 | -- then an error is issued, unless this is an operation of a task or | |
6556 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
6557 | -- has been specified have already been checked above. | |
6558 | ||
6559 | elsif Must_Not_Override (Spec) | |
6560 | and then not Is_Primitive | |
6561 | and then Ekind (Subp) /= E_Entry | |
6562 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
6563 | then | |
ed2233dc | 6564 | Error_Msg_N |
5d37ba92 ES |
6565 | ("overriding indicator only allowed if subprogram is primitive", |
6566 | Subp); | |
5d37ba92 | 6567 | return; |
fbf5a39b | 6568 | end if; |
758c442c | 6569 | end Check_Overriding_Indicator; |
fbf5a39b | 6570 | |
996ae0b0 RK |
6571 | ------------------- |
6572 | -- Check_Returns -- | |
6573 | ------------------- | |
6574 | ||
0a36105d JM |
6575 | -- Note: this procedure needs to know far too much about how the expander |
6576 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
6577 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
6578 | -- works, but is not very clean. It would be better if the expansion | |
6579 | -- routines would leave Original_Node working nicely, and we could use | |
6580 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
6581 | ||
996ae0b0 RK |
6582 | procedure Check_Returns |
6583 | (HSS : Node_Id; | |
6584 | Mode : Character; | |
c8ef728f ES |
6585 | Err : out Boolean; |
6586 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
6587 | is |
6588 | Handler : Node_Id; | |
6589 | ||
6590 | procedure Check_Statement_Sequence (L : List_Id); | |
6591 | -- Internal recursive procedure to check a list of statements for proper | |
6592 | -- termination by a return statement (or a transfer of control or a | |
6593 | -- compound statement that is itself internally properly terminated). | |
6594 | ||
6595 | ------------------------------ | |
6596 | -- Check_Statement_Sequence -- | |
6597 | ------------------------------ | |
6598 | ||
6599 | procedure Check_Statement_Sequence (L : List_Id) is | |
6600 | Last_Stm : Node_Id; | |
0a36105d | 6601 | Stm : Node_Id; |
996ae0b0 RK |
6602 | Kind : Node_Kind; |
6603 | ||
7b27e183 AC |
6604 | function Assert_False return Boolean; |
6605 | -- Returns True if Last_Stm is a pragma Assert (False) that has been | |
6606 | -- rewritten as a null statement when assertions are off. The assert | |
6607 | -- is not active, but it is still enough to kill the warning. | |
6608 | ||
6609 | ------------------ | |
6610 | -- Assert_False -- | |
6611 | ------------------ | |
6612 | ||
6613 | function Assert_False return Boolean is | |
6614 | Orig : constant Node_Id := Original_Node (Last_Stm); | |
6615 | ||
6616 | begin | |
6617 | if Nkind (Orig) = N_Pragma | |
6e759c2a | 6618 | and then Pragma_Name (Orig) = Name_Assert |
7b27e183 AC |
6619 | and then not Error_Posted (Orig) |
6620 | then | |
6621 | declare | |
6622 | Arg : constant Node_Id := | |
6623 | First (Pragma_Argument_Associations (Orig)); | |
6624 | Exp : constant Node_Id := Expression (Arg); | |
6625 | begin | |
6626 | return Nkind (Exp) = N_Identifier | |
6627 | and then Chars (Exp) = Name_False; | |
6628 | end; | |
6629 | ||
6630 | else | |
6631 | return False; | |
6632 | end if; | |
6633 | end Assert_False; | |
6634 | ||
6635 | -- Local variables | |
6636 | ||
996ae0b0 RK |
6637 | Raise_Exception_Call : Boolean; |
6638 | -- Set True if statement sequence terminated by Raise_Exception call | |
6639 | -- or a Reraise_Occurrence call. | |
6640 | ||
7b27e183 AC |
6641 | -- Start of processing for Check_Statement_Sequence |
6642 | ||
996ae0b0 RK |
6643 | begin |
6644 | Raise_Exception_Call := False; | |
6645 | ||
6646 | -- Get last real statement | |
6647 | ||
6648 | Last_Stm := Last (L); | |
6649 | ||
0a36105d JM |
6650 | -- Deal with digging out exception handler statement sequences that |
6651 | -- have been transformed by the local raise to goto optimization. | |
6652 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
6653 | -- optimization has occurred, we are looking at something like: | |
6654 | ||
6655 | -- begin | |
6656 | -- original stmts in block | |
6657 | ||
6658 | -- exception \ | |
6659 | -- when excep1 => | | |
6660 | -- goto L1; | omitted if No_Exception_Propagation | |
6661 | -- when excep2 => | | |
6662 | -- goto L2; / | |
6663 | -- end; | |
6664 | ||
6665 | -- goto L3; -- skip handler when exception not raised | |
6666 | ||
6667 | -- <<L1>> -- target label for local exception | |
6668 | -- begin | |
6669 | -- estmts1 | |
6670 | -- end; | |
6671 | ||
6672 | -- goto L3; | |
6673 | ||
6674 | -- <<L2>> | |
6675 | -- begin | |
6676 | -- estmts2 | |
6677 | -- end; | |
6678 | ||
6679 | -- <<L3>> | |
6680 | ||
6681 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
6682 | -- sequences (which were the original sequences of statements in | |
6683 | -- the exception handlers) and check them. | |
6684 | ||
8fde064e | 6685 | if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
0a36105d JM |
6686 | Stm := Last_Stm; |
6687 | loop | |
6688 | Prev (Stm); | |
6689 | exit when No (Stm); | |
6690 | exit when Nkind (Stm) /= N_Block_Statement; | |
6691 | exit when not Exception_Junk (Stm); | |
6692 | Prev (Stm); | |
6693 | exit when No (Stm); | |
6694 | exit when Nkind (Stm) /= N_Label; | |
6695 | exit when not Exception_Junk (Stm); | |
6696 | Check_Statement_Sequence | |
6697 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
6698 | ||
6699 | Prev (Stm); | |
6700 | Last_Stm := Stm; | |
6701 | exit when No (Stm); | |
6702 | exit when Nkind (Stm) /= N_Goto_Statement; | |
6703 | exit when not Exception_Junk (Stm); | |
6704 | end loop; | |
6705 | end if; | |
6706 | ||
996ae0b0 RK |
6707 | -- Don't count pragmas |
6708 | ||
6709 | while Nkind (Last_Stm) = N_Pragma | |
6710 | ||
6711 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
6712 | ||
6713 | or else | |
6714 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
6715 | and then | |
6716 | Nkind (Name (Last_Stm)) = N_Identifier | |
6717 | and then | |
6718 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
6719 | ||
6720 | -- Don't count exception junk | |
6721 | ||
6722 | or else | |
800621e0 RD |
6723 | (Nkind_In (Last_Stm, N_Goto_Statement, |
6724 | N_Label, | |
6725 | N_Object_Declaration) | |
8fde064e | 6726 | and then Exception_Junk (Last_Stm)) |
0a36105d JM |
6727 | or else Nkind (Last_Stm) in N_Push_xxx_Label |
6728 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
e3b3266c AC |
6729 | |
6730 | -- Inserted code, such as finalization calls, is irrelevant: we only | |
6731 | -- need to check original source. | |
6732 | ||
6733 | or else Is_Rewrite_Insertion (Last_Stm) | |
996ae0b0 RK |
6734 | loop |
6735 | Prev (Last_Stm); | |
6736 | end loop; | |
6737 | ||
6738 | -- Here we have the "real" last statement | |
6739 | ||
6740 | Kind := Nkind (Last_Stm); | |
6741 | ||
6742 | -- Transfer of control, OK. Note that in the No_Return procedure | |
6743 | -- case, we already diagnosed any explicit return statements, so | |
6744 | -- we can treat them as OK in this context. | |
6745 | ||
6746 | if Is_Transfer (Last_Stm) then | |
6747 | return; | |
6748 | ||
6749 | -- Check cases of explicit non-indirect procedure calls | |
6750 | ||
6751 | elsif Kind = N_Procedure_Call_Statement | |
6752 | and then Is_Entity_Name (Name (Last_Stm)) | |
6753 | then | |
6754 | -- Check call to Raise_Exception procedure which is treated | |
6755 | -- specially, as is a call to Reraise_Occurrence. | |
6756 | ||
6757 | -- We suppress the warning in these cases since it is likely that | |
6758 | -- the programmer really does not expect to deal with the case | |
6759 | -- of Null_Occurrence, and thus would find a warning about a | |
6760 | -- missing return curious, and raising Program_Error does not | |
6761 | -- seem such a bad behavior if this does occur. | |
6762 | ||
c8ef728f ES |
6763 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
6764 | -- behavior will be to raise Constraint_Error (see AI-329). | |
6765 | ||
996ae0b0 RK |
6766 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
6767 | or else | |
6768 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
6769 | then | |
6770 | Raise_Exception_Call := True; | |
6771 | ||
6772 | -- For Raise_Exception call, test first argument, if it is | |
6773 | -- an attribute reference for a 'Identity call, then we know | |
6774 | -- that the call cannot possibly return. | |
6775 | ||
6776 | declare | |
6777 | Arg : constant Node_Id := | |
6778 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
6779 | begin |
6780 | if Nkind (Arg) = N_Attribute_Reference | |
6781 | and then Attribute_Name (Arg) = Name_Identity | |
6782 | then | |
6783 | return; | |
6784 | end if; | |
6785 | end; | |
6786 | end if; | |
6787 | ||
6788 | -- If statement, need to look inside if there is an else and check | |
6789 | -- each constituent statement sequence for proper termination. | |
6790 | ||
6791 | elsif Kind = N_If_Statement | |
6792 | and then Present (Else_Statements (Last_Stm)) | |
6793 | then | |
6794 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
6795 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6796 | ||
6797 | if Present (Elsif_Parts (Last_Stm)) then | |
6798 | declare | |
6799 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
6800 | ||
6801 | begin | |
6802 | while Present (Elsif_Part) loop | |
6803 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
6804 | Next (Elsif_Part); | |
6805 | end loop; | |
6806 | end; | |
6807 | end if; | |
6808 | ||
6809 | return; | |
6810 | ||
6811 | -- Case statement, check each case for proper termination | |
6812 | ||
6813 | elsif Kind = N_Case_Statement then | |
6814 | declare | |
6815 | Case_Alt : Node_Id; | |
996ae0b0 RK |
6816 | begin |
6817 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
6818 | while Present (Case_Alt) loop | |
6819 | Check_Statement_Sequence (Statements (Case_Alt)); | |
6820 | Next_Non_Pragma (Case_Alt); | |
6821 | end loop; | |
6822 | end; | |
6823 | ||
6824 | return; | |
6825 | ||
6826 | -- Block statement, check its handled sequence of statements | |
6827 | ||
6828 | elsif Kind = N_Block_Statement then | |
6829 | declare | |
6830 | Err1 : Boolean; | |
6831 | ||
6832 | begin | |
6833 | Check_Returns | |
6834 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
6835 | ||
6836 | if Err1 then | |
6837 | Err := True; | |
6838 | end if; | |
6839 | ||
6840 | return; | |
6841 | end; | |
6842 | ||
6843 | -- Loop statement. If there is an iteration scheme, we can definitely | |
6844 | -- fall out of the loop. Similarly if there is an exit statement, we | |
6845 | -- can fall out. In either case we need a following return. | |
6846 | ||
6847 | elsif Kind = N_Loop_Statement then | |
6848 | if Present (Iteration_Scheme (Last_Stm)) | |
6849 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
6850 | then | |
6851 | null; | |
6852 | ||
f3d57416 RW |
6853 | -- A loop with no exit statement or iteration scheme is either |
6854 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
6855 | -- In either case, no warning is required. |
6856 | ||
6857 | else | |
6858 | return; | |
6859 | end if; | |
6860 | ||
6861 | -- Timed entry call, check entry call and delay alternatives | |
6862 | ||
6863 | -- Note: in expanded code, the timed entry call has been converted | |
6864 | -- to a set of expanded statements on which the check will work | |
6865 | -- correctly in any case. | |
6866 | ||
6867 | elsif Kind = N_Timed_Entry_Call then | |
6868 | declare | |
6869 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6870 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
6871 | ||
6872 | begin | |
6873 | -- If statement sequence of entry call alternative is missing, | |
6874 | -- then we can definitely fall through, and we post the error | |
6875 | -- message on the entry call alternative itself. | |
6876 | ||
6877 | if No (Statements (ECA)) then | |
6878 | Last_Stm := ECA; | |
6879 | ||
6880 | -- If statement sequence of delay alternative is missing, then | |
6881 | -- we can definitely fall through, and we post the error | |
6882 | -- message on the delay alternative itself. | |
6883 | ||
6884 | -- Note: if both ECA and DCA are missing the return, then we | |
6885 | -- post only one message, should be enough to fix the bugs. | |
6886 | -- If not we will get a message next time on the DCA when the | |
a90bd866 | 6887 | -- ECA is fixed. |
996ae0b0 RK |
6888 | |
6889 | elsif No (Statements (DCA)) then | |
6890 | Last_Stm := DCA; | |
6891 | ||
6892 | -- Else check both statement sequences | |
6893 | ||
6894 | else | |
6895 | Check_Statement_Sequence (Statements (ECA)); | |
6896 | Check_Statement_Sequence (Statements (DCA)); | |
6897 | return; | |
6898 | end if; | |
6899 | end; | |
6900 | ||
6901 | -- Conditional entry call, check entry call and else part | |
6902 | ||
6903 | -- Note: in expanded code, the conditional entry call has been | |
6904 | -- converted to a set of expanded statements on which the check | |
6905 | -- will work correctly in any case. | |
6906 | ||
6907 | elsif Kind = N_Conditional_Entry_Call then | |
6908 | declare | |
6909 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6910 | ||
6911 | begin | |
6912 | -- If statement sequence of entry call alternative is missing, | |
6913 | -- then we can definitely fall through, and we post the error | |
6914 | -- message on the entry call alternative itself. | |
6915 | ||
6916 | if No (Statements (ECA)) then | |
6917 | Last_Stm := ECA; | |
6918 | ||
6919 | -- Else check statement sequence and else part | |
6920 | ||
6921 | else | |
6922 | Check_Statement_Sequence (Statements (ECA)); | |
6923 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6924 | return; | |
6925 | end if; | |
6926 | end; | |
6927 | end if; | |
6928 | ||
6929 | -- If we fall through, issue appropriate message | |
6930 | ||
6931 | if Mode = 'F' then | |
7b27e183 AC |
6932 | |
6933 | -- Kill warning if last statement is a raise exception call, | |
6934 | -- or a pragma Assert (False). Note that with assertions enabled, | |
6935 | -- such a pragma has been converted into a raise exception call | |
6936 | -- already, so the Assert_False is for the assertions off case. | |
6937 | ||
6938 | if not Raise_Exception_Call and then not Assert_False then | |
b465ef6f AC |
6939 | |
6940 | -- In GNATprove mode, it is an error to have a missing return | |
6941 | ||
43417b90 | 6942 | Error_Msg_Warn := SPARK_Mode /= On; |
7b27e183 AC |
6943 | |
6944 | -- Issue error message or warning | |
6945 | ||
4a28b181 AC |
6946 | Error_Msg_N |
6947 | ("RETURN statement missing following this statement<<!", | |
6948 | Last_Stm); | |
6949 | Error_Msg_N | |
6950 | ("\Program_Error ]<<!", Last_Stm); | |
996ae0b0 RK |
6951 | end if; |
6952 | ||
6953 | -- Note: we set Err even though we have not issued a warning | |
6954 | -- because we still have a case of a missing return. This is | |
6955 | -- an extremely marginal case, probably will never be noticed | |
6956 | -- but we might as well get it right. | |
6957 | ||
6958 | Err := True; | |
6959 | ||
c8ef728f ES |
6960 | -- Otherwise we have the case of a procedure marked No_Return |
6961 | ||
996ae0b0 | 6962 | else |
800621e0 | 6963 | if not Raise_Exception_Call then |
4a28b181 AC |
6964 | if GNATprove_Mode then |
6965 | Error_Msg_N | |
c99ab5f9 HK |
6966 | ("implied return after this statement would have raised " |
6967 | & "Program_Error", Last_Stm); | |
e9238cc1 | 6968 | |
c99ab5f9 HK |
6969 | -- In normal compilation mode, do not warn on a generated call |
6970 | -- (e.g. in the body of a renaming as completion). | |
e9238cc1 AC |
6971 | |
6972 | elsif Comes_From_Source (Last_Stm) then | |
4a28b181 | 6973 | Error_Msg_N |
c99ab5f9 HK |
6974 | ("implied return after this statement will raise " |
6975 | & "Program_Error??", Last_Stm); | |
4a28b181 AC |
6976 | end if; |
6977 | ||
43417b90 | 6978 | Error_Msg_Warn := SPARK_Mode /= On; |
800621e0 | 6979 | Error_Msg_NE |
4a28b181 | 6980 | ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
800621e0 | 6981 | end if; |
c8ef728f ES |
6982 | |
6983 | declare | |
6984 | RE : constant Node_Id := | |
6985 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
6986 | Reason => PE_Implicit_Return); | |
6987 | begin | |
6988 | Insert_After (Last_Stm, RE); | |
6989 | Analyze (RE); | |
6990 | end; | |
996ae0b0 RK |
6991 | end if; |
6992 | end Check_Statement_Sequence; | |
6993 | ||
6994 | -- Start of processing for Check_Returns | |
6995 | ||
6996 | begin | |
6997 | Err := False; | |
6998 | Check_Statement_Sequence (Statements (HSS)); | |
6999 | ||
7000 | if Present (Exception_Handlers (HSS)) then | |
7001 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
7002 | while Present (Handler) loop | |
7003 | Check_Statement_Sequence (Statements (Handler)); | |
7004 | Next_Non_Pragma (Handler); | |
7005 | end loop; | |
7006 | end if; | |
7007 | end Check_Returns; | |
7008 | ||
7009 | ---------------------------- | |
7010 | -- Check_Subprogram_Order -- | |
7011 | ---------------------------- | |
7012 | ||
7013 | procedure Check_Subprogram_Order (N : Node_Id) is | |
7014 | ||
7015 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
7016 | -- This is used to check if S1 > S2 in the sense required by this test, |
7017 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 7018 | |
82c80734 RD |
7019 | ----------------------------- |
7020 | -- Subprogram_Name_Greater -- | |
7021 | ----------------------------- | |
7022 | ||
996ae0b0 RK |
7023 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
7024 | L1, L2 : Positive; | |
7025 | N1, N2 : Natural; | |
7026 | ||
7027 | begin | |
67336960 AC |
7028 | -- Deal with special case where names are identical except for a |
7029 | -- numerical suffix. These are handled specially, taking the numeric | |
7030 | -- ordering from the suffix into account. | |
996ae0b0 RK |
7031 | |
7032 | L1 := S1'Last; | |
7033 | while S1 (L1) in '0' .. '9' loop | |
7034 | L1 := L1 - 1; | |
7035 | end loop; | |
7036 | ||
7037 | L2 := S2'Last; | |
7038 | while S2 (L2) in '0' .. '9' loop | |
7039 | L2 := L2 - 1; | |
7040 | end loop; | |
7041 | ||
67336960 | 7042 | -- If non-numeric parts non-equal, do straight compare |
996ae0b0 | 7043 | |
67336960 AC |
7044 | if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
7045 | return S1 > S2; | |
996ae0b0 RK |
7046 | |
7047 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
7048 | -- that a missing suffix is treated as numeric zero in this test. | |
7049 | ||
7050 | else | |
7051 | N1 := 0; | |
7052 | while L1 < S1'Last loop | |
7053 | L1 := L1 + 1; | |
7054 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
7055 | end loop; | |
7056 | ||
7057 | N2 := 0; | |
7058 | while L2 < S2'Last loop | |
7059 | L2 := L2 + 1; | |
7060 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
7061 | end loop; | |
7062 | ||
7063 | return N1 > N2; | |
7064 | end if; | |
7065 | end Subprogram_Name_Greater; | |
7066 | ||
7067 | -- Start of processing for Check_Subprogram_Order | |
7068 | ||
7069 | begin | |
7070 | -- Check body in alpha order if this is option | |
7071 | ||
fbf5a39b | 7072 | if Style_Check |
bc202b70 | 7073 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
7074 | and then Nkind (N) = N_Subprogram_Body |
7075 | and then Comes_From_Source (N) | |
7076 | and then In_Extended_Main_Source_Unit (N) | |
7077 | then | |
7078 | declare | |
7079 | LSN : String_Ptr | |
7080 | renames Scope_Stack.Table | |
7081 | (Scope_Stack.Last).Last_Subprogram_Name; | |
7082 | ||
7083 | Body_Id : constant Entity_Id := | |
7084 | Defining_Entity (Specification (N)); | |
7085 | ||
7086 | begin | |
7087 | Get_Decoded_Name_String (Chars (Body_Id)); | |
7088 | ||
7089 | if LSN /= null then | |
7090 | if Subprogram_Name_Greater | |
7091 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
7092 | then | |
7093 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
7094 | end if; | |
7095 | ||
7096 | Free (LSN); | |
7097 | end if; | |
7098 | ||
7099 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
7100 | end; | |
7101 | end if; | |
7102 | end Check_Subprogram_Order; | |
7103 | ||
7104 | ------------------------------ | |
7105 | -- Check_Subtype_Conformant -- | |
7106 | ------------------------------ | |
7107 | ||
7108 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
7109 | (New_Id : Entity_Id; |
7110 | Old_Id : Entity_Id; | |
7111 | Err_Loc : Node_Id := Empty; | |
f307415a AC |
7112 | Skip_Controlling_Formals : Boolean := False; |
7113 | Get_Inst : Boolean := False) | |
996ae0b0 RK |
7114 | is |
7115 | Result : Boolean; | |
81db9d77 | 7116 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7117 | begin |
7118 | Check_Conformance | |
ce2b6ba5 | 7119 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
f307415a AC |
7120 | Skip_Controlling_Formals => Skip_Controlling_Formals, |
7121 | Get_Inst => Get_Inst); | |
996ae0b0 RK |
7122 | end Check_Subtype_Conformant; |
7123 | ||
42f11e4c AC |
7124 | ----------------------------------- |
7125 | -- Check_Synchronized_Overriding -- | |
7126 | ----------------------------------- | |
7127 | ||
7128 | procedure Check_Synchronized_Overriding | |
7129 | (Def_Id : Entity_Id; | |
7130 | Overridden_Subp : out Entity_Id) | |
7131 | is | |
7132 | Ifaces_List : Elist_Id; | |
7133 | In_Scope : Boolean; | |
7134 | Typ : Entity_Id; | |
7135 | ||
7136 | function Matches_Prefixed_View_Profile | |
7137 | (Prim_Params : List_Id; | |
7138 | Iface_Params : List_Id) return Boolean; | |
7139 | -- Determine whether a subprogram's parameter profile Prim_Params | |
7140 | -- matches that of a potentially overridden interface subprogram | |
7141 | -- Iface_Params. Also determine if the type of first parameter of | |
7142 | -- Iface_Params is an implemented interface. | |
7143 | ||
7144 | ----------------------------------- | |
7145 | -- Matches_Prefixed_View_Profile -- | |
7146 | ----------------------------------- | |
7147 | ||
7148 | function Matches_Prefixed_View_Profile | |
7149 | (Prim_Params : List_Id; | |
7150 | Iface_Params : List_Id) return Boolean | |
7151 | is | |
42f11e4c AC |
7152 | function Is_Implemented |
7153 | (Ifaces_List : Elist_Id; | |
7154 | Iface : Entity_Id) return Boolean; | |
7155 | -- Determine if Iface is implemented by the current task or | |
7156 | -- protected type. | |
7157 | ||
7158 | -------------------- | |
7159 | -- Is_Implemented -- | |
7160 | -------------------- | |
7161 | ||
7162 | function Is_Implemented | |
7163 | (Ifaces_List : Elist_Id; | |
7164 | Iface : Entity_Id) return Boolean | |
7165 | is | |
7166 | Iface_Elmt : Elmt_Id; | |
7167 | ||
7168 | begin | |
7169 | Iface_Elmt := First_Elmt (Ifaces_List); | |
7170 | while Present (Iface_Elmt) loop | |
7171 | if Node (Iface_Elmt) = Iface then | |
7172 | return True; | |
7173 | end if; | |
7174 | ||
7175 | Next_Elmt (Iface_Elmt); | |
7176 | end loop; | |
7177 | ||
7178 | return False; | |
7179 | end Is_Implemented; | |
7180 | ||
bac5ba15 AC |
7181 | -- Local variables |
7182 | ||
7183 | Iface_Id : Entity_Id; | |
7184 | Iface_Param : Node_Id; | |
7185 | Iface_Typ : Entity_Id; | |
7186 | Prim_Id : Entity_Id; | |
7187 | Prim_Param : Node_Id; | |
7188 | Prim_Typ : Entity_Id; | |
7189 | ||
42f11e4c AC |
7190 | -- Start of processing for Matches_Prefixed_View_Profile |
7191 | ||
7192 | begin | |
7193 | Iface_Param := First (Iface_Params); | |
7194 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
7195 | ||
7196 | if Is_Access_Type (Iface_Typ) then | |
7197 | Iface_Typ := Designated_Type (Iface_Typ); | |
7198 | end if; | |
7199 | ||
7200 | Prim_Param := First (Prim_Params); | |
7201 | ||
bac5ba15 AC |
7202 | -- The first parameter of the potentially overridden subprogram must |
7203 | -- be an interface implemented by Prim. | |
42f11e4c AC |
7204 | |
7205 | if not Is_Interface (Iface_Typ) | |
7206 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
7207 | then | |
7208 | return False; | |
7209 | end if; | |
7210 | ||
ca90b962 GD |
7211 | -- The checks on the object parameters are done, so move on to the |
7212 | -- rest of the parameters. | |
42f11e4c AC |
7213 | |
7214 | if not In_Scope then | |
7215 | Prim_Param := Next (Prim_Param); | |
7216 | end if; | |
7217 | ||
7218 | Iface_Param := Next (Iface_Param); | |
7219 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
7220 | Iface_Id := Defining_Identifier (Iface_Param); | |
7221 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
7222 | ||
7223 | Prim_Id := Defining_Identifier (Prim_Param); | |
7224 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
7225 | ||
7226 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type | |
7227 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
7228 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
7229 | then | |
7230 | Iface_Typ := Designated_Type (Iface_Typ); | |
bac5ba15 | 7231 | Prim_Typ := Designated_Type (Prim_Typ); |
42f11e4c AC |
7232 | end if; |
7233 | ||
7234 | -- Case of multiple interface types inside a parameter profile | |
7235 | ||
7236 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
7237 | ||
bac5ba15 AC |
7238 | -- If the interface type is implemented, then the matching type in |
7239 | -- the primitive should be the implementing record type. | |
42f11e4c AC |
7240 | |
7241 | if Ekind (Iface_Typ) = E_Record_Type | |
7242 | and then Is_Interface (Iface_Typ) | |
7243 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
7244 | then | |
7245 | if Prim_Typ /= Typ then | |
7246 | return False; | |
7247 | end if; | |
7248 | ||
7249 | -- The two parameters must be both mode and subtype conformant | |
7250 | ||
7251 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
7252 | or else not | |
7253 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
7254 | then | |
7255 | return False; | |
7256 | end if; | |
7257 | ||
7258 | Next (Iface_Param); | |
7259 | Next (Prim_Param); | |
7260 | end loop; | |
7261 | ||
7262 | -- One of the two lists contains more parameters than the other | |
7263 | ||
7264 | if Present (Iface_Param) or else Present (Prim_Param) then | |
7265 | return False; | |
7266 | end if; | |
7267 | ||
7268 | return True; | |
7269 | end Matches_Prefixed_View_Profile; | |
7270 | ||
7271 | -- Start of processing for Check_Synchronized_Overriding | |
7272 | ||
7273 | begin | |
7274 | Overridden_Subp := Empty; | |
7275 | ||
7276 | -- Def_Id must be an entry or a subprogram. We should skip predefined | |
ca90b962 | 7277 | -- primitives internally generated by the front end; however at this |
42f11e4c AC |
7278 | -- stage predefined primitives are still not fully decorated. As a |
7279 | -- minor optimization we skip here internally generated subprograms. | |
7280 | ||
7281 | if (Ekind (Def_Id) /= E_Entry | |
7282 | and then Ekind (Def_Id) /= E_Function | |
7283 | and then Ekind (Def_Id) /= E_Procedure) | |
7284 | or else not Comes_From_Source (Def_Id) | |
7285 | then | |
7286 | return; | |
7287 | end if; | |
7288 | ||
bac5ba15 AC |
7289 | -- Search for the concurrent declaration since it contains the list of |
7290 | -- all implemented interfaces. In this case, the subprogram is declared | |
7291 | -- within the scope of a protected or a task type. | |
42f11e4c AC |
7292 | |
7293 | if Present (Scope (Def_Id)) | |
7294 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
7295 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
7296 | then | |
7297 | Typ := Scope (Def_Id); | |
7298 | In_Scope := True; | |
7299 | ||
7300 | -- The enclosing scope is not a synchronized type and the subprogram | |
7301 | -- has no formals. | |
7302 | ||
7303 | elsif No (First_Formal (Def_Id)) then | |
7304 | return; | |
7305 | ||
7306 | -- The subprogram has formals and hence it may be a primitive of a | |
7307 | -- concurrent type. | |
7308 | ||
7309 | else | |
7310 | Typ := Etype (First_Formal (Def_Id)); | |
7311 | ||
7312 | if Is_Access_Type (Typ) then | |
7313 | Typ := Directly_Designated_Type (Typ); | |
7314 | end if; | |
7315 | ||
7316 | if Is_Concurrent_Type (Typ) | |
7317 | and then not Is_Generic_Actual_Type (Typ) | |
7318 | then | |
7319 | In_Scope := False; | |
7320 | ||
bac5ba15 AC |
7321 | -- This case occurs when the concurrent type is declared within a |
7322 | -- generic unit. As a result the corresponding record has been built | |
7323 | -- and used as the type of the first formal, we just have to retrieve | |
7324 | -- the corresponding concurrent type. | |
42f11e4c AC |
7325 | |
7326 | elsif Is_Concurrent_Record_Type (Typ) | |
7327 | and then not Is_Class_Wide_Type (Typ) | |
7328 | and then Present (Corresponding_Concurrent_Type (Typ)) | |
7329 | then | |
7330 | Typ := Corresponding_Concurrent_Type (Typ); | |
7331 | In_Scope := False; | |
7332 | ||
7333 | else | |
7334 | return; | |
7335 | end if; | |
7336 | end if; | |
7337 | ||
ca90b962 GD |
7338 | -- There is no overriding to check if this is an inherited operation in |
7339 | -- a type derivation for a generic actual. | |
42f11e4c AC |
7340 | |
7341 | Collect_Interfaces (Typ, Ifaces_List); | |
7342 | ||
7343 | if Is_Empty_Elmt_List (Ifaces_List) then | |
7344 | return; | |
7345 | end if; | |
7346 | ||
7347 | -- Determine whether entry or subprogram Def_Id overrides a primitive | |
7348 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
7349 | ||
7350 | declare | |
7351 | Candidate : Entity_Id := Empty; | |
7352 | Hom : Entity_Id := Empty; | |
7353 | Subp : Entity_Id := Empty; | |
7354 | ||
7355 | begin | |
bac5ba15 AC |
7356 | -- Traverse the homonym chain, looking for a potentially overridden |
7357 | -- subprogram that belongs to an implemented interface. | |
42f11e4c AC |
7358 | |
7359 | Hom := Current_Entity_In_Scope (Def_Id); | |
7360 | while Present (Hom) loop | |
7361 | Subp := Hom; | |
7362 | ||
7363 | if Subp = Def_Id | |
7364 | or else not Is_Overloadable (Subp) | |
7365 | or else not Is_Primitive (Subp) | |
7366 | or else not Is_Dispatching_Operation (Subp) | |
7367 | or else not Present (Find_Dispatching_Type (Subp)) | |
7368 | or else not Is_Interface (Find_Dispatching_Type (Subp)) | |
7369 | then | |
7370 | null; | |
7371 | ||
bac5ba15 AC |
7372 | -- Entries and procedures can override abstract or null interface |
7373 | -- procedures. | |
42f11e4c | 7374 | |
bac5ba15 | 7375 | elsif Ekind_In (Def_Id, E_Entry, E_Procedure) |
42f11e4c AC |
7376 | and then Ekind (Subp) = E_Procedure |
7377 | and then Matches_Prefixed_View_Profile | |
7378 | (Parameter_Specifications (Parent (Def_Id)), | |
7379 | Parameter_Specifications (Parent (Subp))) | |
7380 | then | |
7381 | Candidate := Subp; | |
7382 | ||
7383 | -- For an overridden subprogram Subp, check whether the mode | |
bac5ba15 AC |
7384 | -- of its first parameter is correct depending on the kind of |
7385 | -- synchronized type. | |
42f11e4c AC |
7386 | |
7387 | declare | |
7388 | Formal : constant Node_Id := First_Formal (Candidate); | |
7389 | ||
7390 | begin | |
7391 | -- In order for an entry or a protected procedure to | |
bac5ba15 | 7392 | -- override, the first parameter of the overridden routine |
ca90b962 | 7393 | -- must be of mode "out", "in out", or access-to-variable. |
42f11e4c AC |
7394 | |
7395 | if Ekind_In (Candidate, E_Entry, E_Procedure) | |
7396 | and then Is_Protected_Type (Typ) | |
7397 | and then Ekind (Formal) /= E_In_Out_Parameter | |
7398 | and then Ekind (Formal) /= E_Out_Parameter | |
7399 | and then Nkind (Parameter_Type (Parent (Formal))) /= | |
7400 | N_Access_Definition | |
7401 | then | |
7402 | null; | |
7403 | ||
bac5ba15 AC |
7404 | -- All other cases are OK since a task entry or routine does |
7405 | -- not have a restriction on the mode of the first parameter | |
7406 | -- of the overridden interface routine. | |
42f11e4c AC |
7407 | |
7408 | else | |
7409 | Overridden_Subp := Candidate; | |
7410 | return; | |
7411 | end if; | |
7412 | end; | |
7413 | ||
7414 | -- Functions can override abstract interface functions | |
7415 | ||
7416 | elsif Ekind (Def_Id) = E_Function | |
7417 | and then Ekind (Subp) = E_Function | |
7418 | and then Matches_Prefixed_View_Profile | |
7419 | (Parameter_Specifications (Parent (Def_Id)), | |
7420 | Parameter_Specifications (Parent (Subp))) | |
ca90b962 | 7421 | and then Etype (Def_Id) = Etype (Subp) |
42f11e4c AC |
7422 | then |
7423 | Candidate := Subp; | |
7424 | ||
7425 | -- If an inherited subprogram is implemented by a protected | |
7426 | -- function, then the first parameter of the inherited | |
bac5ba15 | 7427 | -- subprogram shall be of mode in, but not an access-to- |
ca90b962 | 7428 | -- variable parameter (RM 9.4(11/9)). |
42f11e4c AC |
7429 | |
7430 | if Present (First_Formal (Subp)) | |
7431 | and then Ekind (First_Formal (Subp)) = E_In_Parameter | |
7432 | and then | |
7433 | (not Is_Access_Type (Etype (First_Formal (Subp))) | |
7434 | or else | |
7435 | Is_Access_Constant (Etype (First_Formal (Subp)))) | |
7436 | then | |
7437 | Overridden_Subp := Subp; | |
7438 | return; | |
7439 | end if; | |
7440 | end if; | |
7441 | ||
7442 | Hom := Homonym (Hom); | |
7443 | end loop; | |
7444 | ||
7445 | -- After examining all candidates for overriding, we are left with | |
ca90b962 | 7446 | -- the best match, which is a mode-incompatible interface routine. |
42f11e4c AC |
7447 | |
7448 | if In_Scope and then Present (Candidate) then | |
7449 | Error_Msg_PT (Def_Id, Candidate); | |
7450 | end if; | |
7451 | ||
7452 | Overridden_Subp := Candidate; | |
7453 | return; | |
7454 | end; | |
7455 | end Check_Synchronized_Overriding; | |
7456 | ||
996ae0b0 RK |
7457 | --------------------------- |
7458 | -- Check_Type_Conformant -- | |
7459 | --------------------------- | |
7460 | ||
7461 | procedure Check_Type_Conformant | |
7462 | (New_Id : Entity_Id; | |
7463 | Old_Id : Entity_Id; | |
7464 | Err_Loc : Node_Id := Empty) | |
7465 | is | |
7466 | Result : Boolean; | |
81db9d77 | 7467 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7468 | begin |
7469 | Check_Conformance | |
7470 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
7471 | end Check_Type_Conformant; | |
7472 | ||
806f6d37 AC |
7473 | --------------------------- |
7474 | -- Can_Override_Operator -- | |
7475 | --------------------------- | |
7476 | ||
7477 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
7478 | Typ : Entity_Id; | |
f146302c | 7479 | |
806f6d37 AC |
7480 | begin |
7481 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
7482 | return False; | |
7483 | ||
7484 | else | |
7485 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
7486 | ||
f146302c AC |
7487 | -- Check explicitly that the operation is a primitive of the type |
7488 | ||
806f6d37 | 7489 | return Operator_Matches_Spec (Subp, Subp) |
f146302c | 7490 | and then not Is_Generic_Type (Typ) |
806f6d37 AC |
7491 | and then Scope (Subp) = Scope (Typ) |
7492 | and then not Is_Class_Wide_Type (Typ); | |
7493 | end if; | |
7494 | end Can_Override_Operator; | |
7495 | ||
996ae0b0 RK |
7496 | ---------------------- |
7497 | -- Conforming_Types -- | |
7498 | ---------------------- | |
7499 | ||
7500 | function Conforming_Types | |
7501 | (T1 : Entity_Id; | |
7502 | T2 : Entity_Id; | |
7503 | Ctype : Conformance_Type; | |
d05ef0ab | 7504 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 | 7505 | is |
0310af44 AC |
7506 | function Base_Types_Match |
7507 | (Typ_1 : Entity_Id; | |
7508 | Typ_2 : Entity_Id) return Boolean; | |
7509 | -- If neither Typ_1 nor Typ_2 are generic actual types, or if they are | |
7510 | -- in different scopes (e.g. parent and child instances), then verify | |
7511 | -- that the base types are equal. Otherwise Typ_1 and Typ_2 must be on | |
7512 | -- the same subtype chain. The whole purpose of this procedure is to | |
7513 | -- prevent spurious ambiguities in an instantiation that may arise if | |
7514 | -- two distinct generic types are instantiated with the same actual. | |
7515 | ||
7516 | function Find_Designated_Type (Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
7517 | -- An access parameter can designate an incomplete type. If the |
7518 | -- incomplete type is the limited view of a type from a limited_ | |
0310af44 AC |
7519 | -- with_clause, check whether the non-limited view is available. |
7520 | -- If it is a (non-limited) incomplete type, get the full view. | |
7521 | ||
7522 | function Matches_Limited_With_View | |
7523 | (Typ_1 : Entity_Id; | |
7524 | Typ_2 : Entity_Id) return Boolean; | |
7525 | -- Returns True if and only if either Typ_1 denotes a limited view of | |
7526 | -- Typ_2 or Typ_2 denotes a limited view of Typ_1. This can arise when | |
7527 | -- the limited with view of a type is used in a subprogram declaration | |
7528 | -- and the subprogram body is in the scope of a regular with clause for | |
7529 | -- the same unit. In such a case, the two type entities are considered | |
0a36105d | 7530 | -- identical for purposes of conformance checking. |
996ae0b0 RK |
7531 | |
7532 | ---------------------- | |
7533 | -- Base_Types_Match -- | |
7534 | ---------------------- | |
7535 | ||
0310af44 AC |
7536 | function Base_Types_Match |
7537 | (Typ_1 : Entity_Id; | |
7538 | Typ_2 : Entity_Id) return Boolean | |
7539 | is | |
7540 | Base_1 : constant Entity_Id := Base_Type (Typ_1); | |
7541 | Base_2 : constant Entity_Id := Base_Type (Typ_2); | |
8fde064e | 7542 | |
996ae0b0 | 7543 | begin |
0310af44 | 7544 | if Typ_1 = Typ_2 then |
996ae0b0 RK |
7545 | return True; |
7546 | ||
0310af44 | 7547 | elsif Base_1 = Base_2 then |
996ae0b0 | 7548 | |
0a36105d | 7549 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
7550 | -- check that the generic actual is an ancestor subtype of the |
7551 | -- other ???. | |
586ecbf3 | 7552 | |
70f4ad20 AC |
7553 | -- See code in Find_Corresponding_Spec that applies an additional |
7554 | -- filter to handle accidental amiguities in instances. | |
996ae0b0 | 7555 | |
0310af44 AC |
7556 | return |
7557 | not Is_Generic_Actual_Type (Typ_1) | |
7558 | or else not Is_Generic_Actual_Type (Typ_2) | |
7559 | or else Scope (Typ_1) /= Scope (Typ_2); | |
996ae0b0 | 7560 | |
0310af44 | 7561 | -- If Typ_2 is a generic actual type it is declared as the subtype of |
2995860f AC |
7562 | -- the actual. If that actual is itself a subtype we need to use its |
7563 | -- own base type to check for compatibility. | |
8fde064e | 7564 | |
0310af44 AC |
7565 | elsif Ekind (Base_2) = Ekind (Typ_2) |
7566 | and then Base_1 = Base_Type (Base_2) | |
7567 | then | |
8fde064e AC |
7568 | return True; |
7569 | ||
0310af44 AC |
7570 | elsif Ekind (Base_1) = Ekind (Typ_1) |
7571 | and then Base_2 = Base_Type (Base_1) | |
7572 | then | |
8fde064e AC |
7573 | return True; |
7574 | ||
0a36105d JM |
7575 | else |
7576 | return False; | |
7577 | end if; | |
7578 | end Base_Types_Match; | |
aa720a54 | 7579 | |
5d37ba92 ES |
7580 | -------------------------- |
7581 | -- Find_Designated_Type -- | |
7582 | -------------------------- | |
7583 | ||
0310af44 | 7584 | function Find_Designated_Type (Typ : Entity_Id) return Entity_Id is |
5d37ba92 ES |
7585 | Desig : Entity_Id; |
7586 | ||
7587 | begin | |
0310af44 | 7588 | Desig := Directly_Designated_Type (Typ); |
5d37ba92 ES |
7589 | |
7590 | if Ekind (Desig) = E_Incomplete_Type then | |
7591 | ||
7592 | -- If regular incomplete type, get full view if available | |
7593 | ||
7594 | if Present (Full_View (Desig)) then | |
7595 | Desig := Full_View (Desig); | |
7596 | ||
7597 | -- If limited view of a type, get non-limited view if available, | |
7598 | -- and check again for a regular incomplete type. | |
7599 | ||
7600 | elsif Present (Non_Limited_View (Desig)) then | |
7601 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
7602 | end if; | |
7603 | end if; | |
7604 | ||
7605 | return Desig; | |
7606 | end Find_Designated_Type; | |
7607 | ||
0a36105d JM |
7608 | ------------------------------- |
7609 | -- Matches_Limited_With_View -- | |
7610 | ------------------------------- | |
7611 | ||
0310af44 AC |
7612 | function Matches_Limited_With_View |
7613 | (Typ_1 : Entity_Id; | |
7614 | Typ_2 : Entity_Id) return Boolean | |
7615 | is | |
7616 | function Is_Matching_Limited_View | |
7617 | (Typ : Entity_Id; | |
7618 | View : Entity_Id) return Boolean; | |
7619 | -- Determine whether non-limited view View denotes type Typ in some | |
7620 | -- conformant fashion. | |
7621 | ||
7622 | ------------------------------ | |
7623 | -- Is_Matching_Limited_View -- | |
7624 | ------------------------------ | |
7625 | ||
7626 | function Is_Matching_Limited_View | |
7627 | (Typ : Entity_Id; | |
7628 | View : Entity_Id) return Boolean | |
7629 | is | |
7630 | Root_Typ : Entity_Id; | |
7631 | Root_View : Entity_Id; | |
7632 | ||
7633 | begin | |
7634 | -- The non-limited view directly denotes the type | |
7635 | ||
7636 | if Typ = View then | |
7637 | return True; | |
7638 | ||
7639 | -- The type is a subtype of the non-limited view | |
7640 | ||
7641 | elsif Is_Subtype_Of (Typ, View) then | |
7642 | return True; | |
7643 | ||
7644 | -- Both the non-limited view and the type denote class-wide types | |
7645 | ||
7646 | elsif Is_Class_Wide_Type (Typ) | |
7647 | and then Is_Class_Wide_Type (View) | |
7648 | then | |
7649 | Root_Typ := Root_Type (Typ); | |
7650 | Root_View := Root_Type (View); | |
7651 | ||
7652 | if Root_Typ = Root_View then | |
7653 | return True; | |
7654 | ||
7655 | -- An incomplete tagged type and its full view may receive two | |
7656 | -- distinct class-wide types when the related package has not | |
7657 | -- been analyzed yet. | |
7658 | ||
7659 | -- package Pack is | |
7660 | -- type T is tagged; -- CW_1 | |
7661 | -- type T is tagged null record; -- CW_2 | |
7662 | -- end Pack; | |
7663 | ||
7664 | -- This is because the package lacks any semantic information | |
7665 | -- that may eventually link both views of T. As a consequence, | |
7666 | -- a client of the limited view of Pack will see CW_2 while a | |
7667 | -- client of the non-limited view of Pack will see CW_1. | |
7668 | ||
7669 | elsif Is_Incomplete_Type (Root_Typ) | |
7670 | and then Present (Full_View (Root_Typ)) | |
7671 | and then Full_View (Root_Typ) = Root_View | |
7672 | then | |
7673 | return True; | |
7674 | ||
7675 | elsif Is_Incomplete_Type (Root_View) | |
7676 | and then Present (Full_View (Root_View)) | |
7677 | and then Full_View (Root_View) = Root_Typ | |
7678 | then | |
7679 | return True; | |
7680 | end if; | |
7681 | end if; | |
7682 | ||
7683 | return False; | |
7684 | end Is_Matching_Limited_View; | |
7685 | ||
7686 | -- Start of processing for Matches_Limited_With_View | |
7687 | ||
0a36105d JM |
7688 | begin |
7689 | -- In some cases a type imported through a limited_with clause, and | |
0310af44 | 7690 | -- its non-limited view are both visible, for example in an anonymous |
28fa5430 AC |
7691 | -- access-to-class-wide type in a formal, or when building the body |
7692 | -- for a subprogram renaming after the subprogram has been frozen. | |
0310af44 | 7693 | -- In these cases both entities designate the same type. In addition, |
28fa5430 AC |
7694 | -- if one of them is an actual in an instance, it may be a subtype of |
7695 | -- the non-limited view of the other. | |
7696 | ||
0310af44 AC |
7697 | if From_Limited_With (Typ_1) |
7698 | and then From_Limited_With (Typ_2) | |
7699 | and then Available_View (Typ_1) = Available_View (Typ_2) | |
28fa5430 | 7700 | then |
aa720a54 AC |
7701 | return True; |
7702 | ||
0310af44 AC |
7703 | elsif From_Limited_With (Typ_1) then |
7704 | return Is_Matching_Limited_View (Typ_2, Available_View (Typ_1)); | |
3e24afaa | 7705 | |
0310af44 AC |
7706 | elsif From_Limited_With (Typ_2) then |
7707 | return Is_Matching_Limited_View (Typ_1, Available_View (Typ_2)); | |
41251c60 | 7708 | |
996ae0b0 RK |
7709 | else |
7710 | return False; | |
7711 | end if; | |
0a36105d | 7712 | end Matches_Limited_With_View; |
996ae0b0 | 7713 | |
0310af44 AC |
7714 | -- Local variables |
7715 | ||
7716 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; | |
7717 | ||
7718 | Type_1 : Entity_Id := T1; | |
7719 | Type_2 : Entity_Id := T2; | |
7720 | ||
ec4867fa | 7721 | -- Start of processing for Conforming_Types |
758c442c | 7722 | |
996ae0b0 | 7723 | begin |
8fde064e AC |
7724 | -- The context is an instance association for a formal access-to- |
7725 | -- subprogram type; the formal parameter types require mapping because | |
7726 | -- they may denote other formal parameters of the generic unit. | |
996ae0b0 RK |
7727 | |
7728 | if Get_Inst then | |
7729 | Type_1 := Get_Instance_Of (T1); | |
7730 | Type_2 := Get_Instance_Of (T2); | |
7731 | end if; | |
7732 | ||
0a36105d JM |
7733 | -- If one of the types is a view of the other introduced by a limited |
7734 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 7735 | |
0a36105d JM |
7736 | if Matches_Limited_With_View (T1, T2) then |
7737 | return True; | |
7738 | ||
7739 | elsif Base_Types_Match (Type_1, Type_2) then | |
7738270b AC |
7740 | if Ctype <= Mode_Conformant then |
7741 | return True; | |
7742 | ||
7743 | else | |
7744 | return | |
7745 | Subtypes_Statically_Match (Type_1, Type_2) | |
7746 | and then Dimensions_Match (Type_1, Type_2); | |
7747 | end if; | |
996ae0b0 RK |
7748 | |
7749 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
7750 | and then Present (Full_View (Type_1)) | |
7751 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
7752 | then | |
7738270b AC |
7753 | return |
7754 | Ctype <= Mode_Conformant | |
7755 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
996ae0b0 RK |
7756 | |
7757 | elsif Ekind (Type_2) = E_Incomplete_Type | |
7758 | and then Present (Full_View (Type_2)) | |
7759 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7760 | then | |
7738270b AC |
7761 | return |
7762 | Ctype <= Mode_Conformant | |
7763 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
7764 | |
7765 | elsif Is_Private_Type (Type_2) | |
7766 | and then In_Instance | |
7767 | and then Present (Full_View (Type_2)) | |
7768 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7769 | then | |
7738270b AC |
7770 | return |
7771 | Ctype <= Mode_Conformant | |
7772 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
167b47d9 | 7773 | |
7727a9c1 AC |
7774 | -- Another confusion between views in a nested instance with an |
7775 | -- actual private type whose full view is not in scope. | |
7776 | ||
7777 | elsif Ekind (Type_2) = E_Private_Subtype | |
7778 | and then In_Instance | |
7779 | and then Etype (Type_2) = Type_1 | |
7780 | then | |
7781 | return True; | |
7782 | ||
088c7e1b | 7783 | -- In Ada 2012, incomplete types (including limited views) can appear |
5b85ad7d PMR |
7784 | -- as actuals in instantiations, where they are conformant to the |
7785 | -- corresponding incomplete formal. | |
167b47d9 AC |
7786 | |
7787 | elsif Is_Incomplete_Type (Type_1) | |
7788 | and then Is_Incomplete_Type (Type_2) | |
5b85ad7d | 7789 | and then In_Instance |
167b47d9 AC |
7790 | and then (Used_As_Generic_Actual (Type_1) |
7791 | or else Used_As_Generic_Actual (Type_2)) | |
7792 | then | |
7793 | return True; | |
996ae0b0 RK |
7794 | end if; |
7795 | ||
0a36105d | 7796 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
466c2127 AC |
7797 | -- treated recursively because they carry a signature. As far as |
7798 | -- conformance is concerned, convention plays no role, and either | |
7799 | -- or both could be access to protected subprograms. | |
af4b9434 AC |
7800 | |
7801 | Are_Anonymous_Access_To_Subprogram_Types := | |
466c2127 AC |
7802 | Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
7803 | E_Anonymous_Access_Protected_Subprogram_Type) | |
f937473f | 7804 | and then |
466c2127 AC |
7805 | Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
7806 | E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 7807 | |
996ae0b0 | 7808 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
7809 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
7810 | -- the base types because we may have built internal subtype entities | |
7811 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 7812 | |
5d37ba92 ES |
7813 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
7814 | and then | |
7815 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
8fde064e AC |
7816 | |
7817 | -- Ada 2005 (AI-254) | |
7818 | ||
7819 | or else Are_Anonymous_Access_To_Subprogram_Types | |
996ae0b0 RK |
7820 | then |
7821 | declare | |
7822 | Desig_1 : Entity_Id; | |
7823 | Desig_2 : Entity_Id; | |
7824 | ||
7825 | begin | |
885c4871 | 7826 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 7827 | -- subtype conformance. |
9dcb52e1 | 7828 | |
0791fbe9 | 7829 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
7830 | and then Ctype >= Subtype_Conformant |
7831 | and then | |
7832 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
7833 | then | |
7834 | return False; | |
996ae0b0 RK |
7835 | end if; |
7836 | ||
5d37ba92 | 7837 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 7838 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 7839 | |
5d37ba92 | 7840 | -- If the context is an instance association for a formal |
82c80734 RD |
7841 | -- access-to-subprogram type; formal access parameter designated |
7842 | -- types require mapping because they may denote other formal | |
7843 | -- parameters of the generic unit. | |
996ae0b0 RK |
7844 | |
7845 | if Get_Inst then | |
7846 | Desig_1 := Get_Instance_Of (Desig_1); | |
7847 | Desig_2 := Get_Instance_Of (Desig_2); | |
7848 | end if; | |
7849 | ||
82c80734 RD |
7850 | -- It is possible for a Class_Wide_Type to be introduced for an |
7851 | -- incomplete type, in which case there is a separate class_ wide | |
7852 | -- type for the full view. The types conform if their Etypes | |
7853 | -- conform, i.e. one may be the full view of the other. This can | |
7854 | -- only happen in the context of an access parameter, other uses | |
7855 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 7856 | |
fbf5a39b | 7857 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
7858 | and then |
7859 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
7860 | then |
7861 | return | |
fbf5a39b AC |
7862 | Conforming_Types |
7863 | (Etype (Base_Type (Desig_1)), | |
7864 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
7865 | |
7866 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 7867 | if Ada_Version < Ada_2005 then |
7738270b AC |
7868 | return |
7869 | Ctype = Type_Conformant | |
7870 | or else Subtypes_Statically_Match (Desig_1, Desig_2); | |
af4b9434 | 7871 | |
758c442c GD |
7872 | -- We must check the conformance of the signatures themselves |
7873 | ||
7874 | else | |
7875 | declare | |
7876 | Conformant : Boolean; | |
7877 | begin | |
7878 | Check_Conformance | |
7879 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
7880 | return Conformant; | |
7881 | end; | |
7882 | end if; | |
7883 | ||
167b47d9 AC |
7884 | -- A limited view of an actual matches the corresponding |
7885 | -- incomplete formal. | |
7886 | ||
7887 | elsif Ekind (Desig_2) = E_Incomplete_Subtype | |
7888 | and then From_Limited_With (Desig_2) | |
7889 | and then Used_As_Generic_Actual (Etype (Desig_2)) | |
7890 | then | |
7891 | return True; | |
7892 | ||
996ae0b0 RK |
7893 | else |
7894 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
7895 | and then (Ctype = Type_Conformant | |
8fde064e AC |
7896 | or else |
7897 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
7898 | end if; |
7899 | end; | |
7900 | ||
7901 | -- Otherwise definitely no match | |
7902 | ||
7903 | else | |
c8ef728f ES |
7904 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
7905 | and then Is_Access_Type (Type_2)) | |
7906 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
8fde064e | 7907 | and then Is_Access_Type (Type_1))) |
c8ef728f ES |
7908 | and then |
7909 | Conforming_Types | |
7910 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
7911 | then | |
7912 | May_Hide_Profile := True; | |
7913 | end if; | |
7914 | ||
996ae0b0 RK |
7915 | return False; |
7916 | end if; | |
996ae0b0 RK |
7917 | end Conforming_Types; |
7918 | ||
7919 | -------------------------- | |
7920 | -- Create_Extra_Formals -- | |
7921 | -------------------------- | |
7922 | ||
7923 | procedure Create_Extra_Formals (E : Entity_Id) is | |
ec4867fa | 7924 | First_Extra : Entity_Id := Empty; |
8eb8461d AC |
7925 | Formal : Entity_Id; |
7926 | Last_Extra : Entity_Id := Empty; | |
996ae0b0 | 7927 | |
ec4867fa ES |
7928 | function Add_Extra_Formal |
7929 | (Assoc_Entity : Entity_Id; | |
7930 | Typ : Entity_Id; | |
7931 | Scope : Entity_Id; | |
7932 | Suffix : String) return Entity_Id; | |
7933 | -- Add an extra formal to the current list of formals and extra formals. | |
7934 | -- The extra formal is added to the end of the list of extra formals, | |
7935 | -- and also returned as the result. These formals are always of mode IN. | |
7936 | -- The new formal has the type Typ, is declared in Scope, and its name | |
7937 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
7938 | -- The following suffixes are currently used. They should not be changed |
7939 | -- without coordinating with CodePeer, which makes use of these to | |
7940 | -- provide better messages. | |
7941 | ||
d92eccc3 AC |
7942 | -- O denotes the Constrained bit. |
7943 | -- L denotes the accessibility level. | |
cd5a9750 AC |
7944 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
7945 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 7946 | |
fbf5a39b AC |
7947 | ---------------------- |
7948 | -- Add_Extra_Formal -- | |
7949 | ---------------------- | |
7950 | ||
ec4867fa ES |
7951 | function Add_Extra_Formal |
7952 | (Assoc_Entity : Entity_Id; | |
7953 | Typ : Entity_Id; | |
7954 | Scope : Entity_Id; | |
7955 | Suffix : String) return Entity_Id | |
7956 | is | |
996ae0b0 | 7957 | EF : constant Entity_Id := |
ec4867fa ES |
7958 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
7959 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 7960 | Suffix => Suffix)); |
996ae0b0 RK |
7961 | |
7962 | begin | |
82c80734 RD |
7963 | -- A little optimization. Never generate an extra formal for the |
7964 | -- _init operand of an initialization procedure, since it could | |
7965 | -- never be used. | |
996ae0b0 RK |
7966 | |
7967 | if Chars (Formal) = Name_uInit then | |
7968 | return Empty; | |
7969 | end if; | |
7970 | ||
7971 | Set_Ekind (EF, E_In_Parameter); | |
7972 | Set_Actual_Subtype (EF, Typ); | |
7973 | Set_Etype (EF, Typ); | |
ec4867fa | 7974 | Set_Scope (EF, Scope); |
996ae0b0 RK |
7975 | Set_Mechanism (EF, Default_Mechanism); |
7976 | Set_Formal_Validity (EF); | |
7977 | ||
ec4867fa ES |
7978 | if No (First_Extra) then |
7979 | First_Extra := EF; | |
d00301ec | 7980 | Set_Extra_Formals (Scope, EF); |
ec4867fa ES |
7981 | end if; |
7982 | ||
7983 | if Present (Last_Extra) then | |
7984 | Set_Extra_Formal (Last_Extra, EF); | |
7985 | end if; | |
7986 | ||
996ae0b0 | 7987 | Last_Extra := EF; |
ec4867fa | 7988 | |
996ae0b0 RK |
7989 | return EF; |
7990 | end Add_Extra_Formal; | |
7991 | ||
8eb8461d AC |
7992 | -- Local variables |
7993 | ||
7994 | Formal_Type : Entity_Id; | |
7995 | P_Formal : Entity_Id := Empty; | |
7996 | ||
996ae0b0 RK |
7997 | -- Start of processing for Create_Extra_Formals |
7998 | ||
7999 | begin | |
8fde064e AC |
8000 | -- We never generate extra formals if expansion is not active because we |
8001 | -- don't need them unless we are generating code. | |
f937473f RD |
8002 | |
8003 | if not Expander_Active then | |
8004 | return; | |
8005 | end if; | |
8006 | ||
e2441021 AC |
8007 | -- No need to generate extra formals in interface thunks whose target |
8008 | -- primitive has no extra formals. | |
8009 | ||
8010 | if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then | |
8011 | return; | |
8012 | end if; | |
8013 | ||
82c80734 | 8014 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 8015 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 8016 | -- for extra formals. |
996ae0b0 RK |
8017 | |
8018 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
8019 | P_Formal := First_Formal (Alias (E)); | |
8020 | end if; | |
8021 | ||
996ae0b0 RK |
8022 | Formal := First_Formal (E); |
8023 | while Present (Formal) loop | |
8024 | Last_Extra := Formal; | |
8025 | Next_Formal (Formal); | |
8026 | end loop; | |
8027 | ||
03a72cd3 | 8028 | -- If Extra_Formals were already created, don't do it again. This |
82c80734 | 8029 | -- situation may arise for subprogram types created as part of |
d00301ec | 8030 | -- dispatching calls (see Expand_Dispatching_Call). |
996ae0b0 | 8031 | |
8fde064e | 8032 | if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
996ae0b0 RK |
8033 | return; |
8034 | end if; | |
8035 | ||
19590d70 GD |
8036 | -- If the subprogram is a predefined dispatching subprogram then don't |
8037 | -- generate any extra constrained or accessibility level formals. In | |
8038 | -- general we suppress these for internal subprograms (by not calling | |
8039 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
8040 | -- generated stream attributes do get passed through because extra | |
8041 | -- build-in-place formals are needed in some cases (limited 'Input). | |
8042 | ||
bac7206d | 8043 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 8044 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
8045 | end if; |
8046 | ||
996ae0b0 | 8047 | Formal := First_Formal (E); |
996ae0b0 RK |
8048 | while Present (Formal) loop |
8049 | ||
8050 | -- Create extra formal for supporting the attribute 'Constrained. | |
8051 | -- The case of a private type view without discriminants also | |
8052 | -- requires the extra formal if the underlying type has defaulted | |
8053 | -- discriminants. | |
8054 | ||
8055 | if Ekind (Formal) /= E_In_Parameter then | |
8056 | if Present (P_Formal) then | |
8057 | Formal_Type := Etype (P_Formal); | |
8058 | else | |
8059 | Formal_Type := Etype (Formal); | |
8060 | end if; | |
8061 | ||
5d09245e AC |
8062 | -- Do not produce extra formals for Unchecked_Union parameters. |
8063 | -- Jump directly to the end of the loop. | |
8064 | ||
8065 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
8066 | goto Skip_Extra_Formal_Generation; | |
8067 | end if; | |
8068 | ||
996ae0b0 RK |
8069 | if not Has_Discriminants (Formal_Type) |
8070 | and then Ekind (Formal_Type) in Private_Kind | |
8071 | and then Present (Underlying_Type (Formal_Type)) | |
8072 | then | |
8073 | Formal_Type := Underlying_Type (Formal_Type); | |
8074 | end if; | |
8075 | ||
5e5db3b4 GD |
8076 | -- Suppress the extra formal if formal's subtype is constrained or |
8077 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
8078 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
8079 | -- can have defaulted discriminants, but 'Constrained is required | |
8080 | -- to return True, so the formal is never needed (see AI05-0214). | |
8081 | -- Note that this ensures consistency of calling sequences for | |
8082 | -- dispatching operations when some types in a class have defaults | |
8083 | -- on discriminants and others do not (and requiring the extra | |
8084 | -- formal would introduce distributed overhead). | |
8085 | ||
b5bdffcc AC |
8086 | -- If the type does not have a completion yet, treat as prior to |
8087 | -- Ada 2012 for consistency. | |
8088 | ||
996ae0b0 | 8089 | if Has_Discriminants (Formal_Type) |
f937473f | 8090 | and then not Is_Constrained (Formal_Type) |
83496138 | 8091 | and then Is_Definite_Subtype (Formal_Type) |
5e5db3b4 | 8092 | and then (Ada_Version < Ada_2012 |
b5bdffcc AC |
8093 | or else No (Underlying_Type (Formal_Type)) |
8094 | or else not | |
8095 | (Is_Limited_Type (Formal_Type) | |
8096 | and then | |
8097 | (Is_Tagged_Type | |
8098 | (Underlying_Type (Formal_Type))))) | |
996ae0b0 RK |
8099 | then |
8100 | Set_Extra_Constrained | |
d92eccc3 | 8101 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
8102 | end if; |
8103 | end if; | |
8104 | ||
0a36105d JM |
8105 | -- Create extra formal for supporting accessibility checking. This |
8106 | -- is done for both anonymous access formals and formals of named | |
8107 | -- access types that are marked as controlling formals. The latter | |
8108 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
8109 | -- type and substitutes the types of access-to-class-wide actuals | |
8110 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
8111 | -- Base_Type is applied because in cases where there is a null |
8112 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
8113 | |
8114 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 8115 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
8116 | -- package in which it resides. However, we do not suppress it |
8117 | -- simply if the scope has accessibility checks suppressed, since | |
8118 | -- this could cause trouble when clients are compiled with a | |
8119 | -- different suppression setting. The explicit checks at the | |
8120 | -- package level are safe from this point of view. | |
996ae0b0 | 8121 | |
5d37ba92 | 8122 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 8123 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 8124 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 8125 | and then not |
fbf5a39b | 8126 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 8127 | or else |
fbf5a39b | 8128 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 8129 | and then |
c8ef728f | 8130 | (No (P_Formal) |
996ae0b0 RK |
8131 | or else Present (Extra_Accessibility (P_Formal))) |
8132 | then | |
811c6a85 | 8133 | Set_Extra_Accessibility |
d92eccc3 | 8134 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
8135 | end if; |
8136 | ||
5d09245e AC |
8137 | -- This label is required when skipping extra formal generation for |
8138 | -- Unchecked_Union parameters. | |
8139 | ||
8140 | <<Skip_Extra_Formal_Generation>> | |
8141 | ||
f937473f RD |
8142 | if Present (P_Formal) then |
8143 | Next_Formal (P_Formal); | |
8144 | end if; | |
8145 | ||
996ae0b0 RK |
8146 | Next_Formal (Formal); |
8147 | end loop; | |
ec4867fa | 8148 | |
63585f75 SB |
8149 | <<Test_For_Func_Result_Extras>> |
8150 | ||
8151 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
8152 | -- function call is ... determined by the point of call ...". | |
8153 | ||
8154 | if Needs_Result_Accessibility_Level (E) then | |
8155 | Set_Extra_Accessibility_Of_Result | |
8156 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
8157 | end if; | |
19590d70 | 8158 | |
ec4867fa | 8159 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
8160 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
8161 | ||
5168a9b3 | 8162 | if Is_Build_In_Place_Function (E) then |
ec4867fa | 8163 | declare |
f937473f | 8164 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 8165 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 8166 | Formal_Typ : Entity_Id; |
8eb8461d | 8167 | Subp_Decl : Node_Id; |
d00301ec | 8168 | Discard : Entity_Id; |
ec4867fa ES |
8169 | |
8170 | begin | |
f937473f | 8171 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
8172 | -- add a 4-state formal indicating whether the return object is |
8173 | -- allocated by the caller (1), or should be allocated by the | |
8174 | -- callee on the secondary stack (2), in the global heap (3), or | |
8175 | -- in a user-defined storage pool (4). For the moment we just use | |
8176 | -- Natural for the type of this formal. Note that this formal | |
8177 | -- isn't usually needed in the case where the result subtype is | |
8178 | -- constrained, but it is needed when the function has a tagged | |
8179 | -- result, because generally such functions can be called in a | |
8180 | -- dispatching context and such calls must be handled like calls | |
8181 | -- to a class-wide function. | |
0a36105d | 8182 | |
1bb6e262 | 8183 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
8184 | Discard := |
8185 | Add_Extra_Formal | |
8186 | (E, Standard_Natural, | |
8187 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 8188 | |
8417f4b2 | 8189 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 | 8190 | -- use a user-defined pool. This formal is not added on |
535a8637 | 8191 | -- ZFP as those targets do not support pools. |
200b7162 | 8192 | |
535a8637 | 8193 | if RTE_Available (RE_Root_Storage_Pool_Ptr) then |
8417f4b2 AC |
8194 | Discard := |
8195 | Add_Extra_Formal | |
8196 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
8197 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
8198 | end if; | |
f937473f | 8199 | end if; |
ec4867fa | 8200 | |
df3e68b1 | 8201 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 8202 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 8203 | |
ca5af305 | 8204 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
8205 | Discard := |
8206 | Add_Extra_Formal | |
ca5af305 AC |
8207 | (E, RTE (RE_Finalization_Master_Ptr), |
8208 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
8209 | end if; |
8210 | ||
94bbf008 AC |
8211 | -- When the result type contains tasks, add two extra formals: the |
8212 | -- master of the tasks to be created, and the caller's activation | |
8213 | -- chain. | |
f937473f | 8214 | |
1a36a0cd | 8215 | if Has_Task (Full_Subt) then |
f937473f RD |
8216 | Discard := |
8217 | Add_Extra_Formal | |
8218 | (E, RTE (RE_Master_Id), | |
af89615f | 8219 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
8220 | Discard := |
8221 | Add_Extra_Formal | |
8222 | (E, RTE (RE_Activation_Chain_Access), | |
8223 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
8224 | end if; | |
ec4867fa | 8225 | |
f937473f RD |
8226 | -- All build-in-place functions get an extra formal that will be |
8227 | -- passed the address of the return object within the caller. | |
ec4867fa | 8228 | |
1a36a0cd AC |
8229 | Formal_Typ := |
8230 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 8231 | |
d00301ec BD |
8232 | -- Incomplete_View_From_Limited_With is needed here because |
8233 | -- gigi gets confused if the designated type is the full view | |
8234 | -- coming from a limited-with'ed package. In the normal case, | |
8235 | -- (no limited with) Incomplete_View_From_Limited_With | |
8236 | -- returns Result_Subt. | |
8237 | ||
8238 | Set_Directly_Designated_Type | |
8239 | (Formal_Typ, Incomplete_View_From_Limited_With (Result_Subt)); | |
1a36a0cd AC |
8240 | Set_Etype (Formal_Typ, Formal_Typ); |
8241 | Set_Depends_On_Private | |
8242 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
8243 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
8244 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 8245 | |
1a36a0cd AC |
8246 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
8247 | -- the designated type comes from the limited view (for back-end | |
8248 | -- purposes). | |
ec4867fa | 8249 | |
7b56a91b AC |
8250 | Set_From_Limited_With |
8251 | (Formal_Typ, From_Limited_With (Result_Subt)); | |
f937473f | 8252 | |
1a36a0cd AC |
8253 | Layout_Type (Formal_Typ); |
8254 | ||
8eb8461d AC |
8255 | -- Force the definition of the Itype in case of internal function |
8256 | -- calls within the same or nested scope. | |
8257 | ||
8258 | if Is_Subprogram_Or_Generic_Subprogram (E) then | |
8259 | Subp_Decl := Parent (E); | |
8260 | ||
8261 | -- The insertion point for an Itype reference should be after | |
8262 | -- the unit declaration node of the subprogram. An exception | |
8263 | -- to this are inherited operations from a parent type in which | |
8264 | -- case the derived type acts as their parent. | |
8265 | ||
8266 | if Nkind_In (Subp_Decl, N_Function_Specification, | |
8267 | N_Procedure_Specification) | |
8268 | then | |
8269 | Subp_Decl := Parent (Subp_Decl); | |
8270 | end if; | |
8271 | ||
8272 | Build_Itype_Reference (Formal_Typ, Subp_Decl); | |
8273 | end if; | |
8274 | ||
1a36a0cd AC |
8275 | Discard := |
8276 | Add_Extra_Formal | |
8277 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
8278 | end; |
8279 | end if; | |
16d92641 PMR |
8280 | |
8281 | -- If this is an instance of a generic, we need to have extra formals | |
8282 | -- for the Alias. | |
8283 | ||
8284 | if Is_Generic_Instance (E) and then Present (Alias (E)) then | |
8285 | Set_Extra_Formals (Alias (E), Extra_Formals (E)); | |
8286 | end if; | |
996ae0b0 RK |
8287 | end Create_Extra_Formals; |
8288 | ||
8289 | ----------------------------- | |
8290 | -- Enter_Overloaded_Entity -- | |
8291 | ----------------------------- | |
8292 | ||
8293 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
51b42ffa AC |
8294 | function Matches_Predefined_Op return Boolean; |
8295 | -- This returns an approximation of whether S matches a predefined | |
8296 | -- operator, based on the operator symbol, and the parameter and result | |
8297 | -- types. The rules are scattered throughout chapter 4 of the Ada RM. | |
8298 | ||
8299 | --------------------------- | |
8300 | -- Matches_Predefined_Op -- | |
8301 | --------------------------- | |
8302 | ||
8303 | function Matches_Predefined_Op return Boolean is | |
8304 | Formal_1 : constant Entity_Id := First_Formal (S); | |
8305 | Formal_2 : constant Entity_Id := Next_Formal (Formal_1); | |
8306 | Op : constant Name_Id := Chars (S); | |
8307 | Result_Type : constant Entity_Id := Base_Type (Etype (S)); | |
8308 | Type_1 : constant Entity_Id := Base_Type (Etype (Formal_1)); | |
8309 | ||
8310 | begin | |
8311 | -- Binary operator | |
8312 | ||
8313 | if Present (Formal_2) then | |
8314 | declare | |
8315 | Type_2 : constant Entity_Id := Base_Type (Etype (Formal_2)); | |
8316 | ||
8317 | begin | |
8318 | -- All but "&" and "**" have same-types parameters | |
8319 | ||
8320 | case Op is | |
d8f43ee6 HK |
8321 | when Name_Op_Concat |
8322 | | Name_Op_Expon | |
8323 | => | |
51b42ffa AC |
8324 | null; |
8325 | ||
8326 | when others => | |
8327 | if Type_1 /= Type_2 then | |
8328 | return False; | |
8329 | end if; | |
8330 | end case; | |
8331 | ||
8332 | -- Check parameter and result types | |
8333 | ||
8334 | case Op is | |
d8f43ee6 HK |
8335 | when Name_Op_And |
8336 | | Name_Op_Or | |
8337 | | Name_Op_Xor | |
8338 | => | |
51b42ffa AC |
8339 | return |
8340 | Is_Boolean_Type (Result_Type) | |
8341 | and then Result_Type = Type_1; | |
8342 | ||
d8f43ee6 HK |
8343 | when Name_Op_Mod |
8344 | | Name_Op_Rem | |
8345 | => | |
51b42ffa AC |
8346 | return |
8347 | Is_Integer_Type (Result_Type) | |
8348 | and then Result_Type = Type_1; | |
8349 | ||
d8f43ee6 HK |
8350 | when Name_Op_Add |
8351 | | Name_Op_Divide | |
8352 | | Name_Op_Multiply | |
8353 | | Name_Op_Subtract | |
8354 | => | |
51b42ffa AC |
8355 | return |
8356 | Is_Numeric_Type (Result_Type) | |
8357 | and then Result_Type = Type_1; | |
8358 | ||
d8f43ee6 HK |
8359 | when Name_Op_Eq |
8360 | | Name_Op_Ne | |
8361 | => | |
51b42ffa AC |
8362 | return |
8363 | Is_Boolean_Type (Result_Type) | |
8364 | and then not Is_Limited_Type (Type_1); | |
8365 | ||
d8f43ee6 HK |
8366 | when Name_Op_Ge |
8367 | | Name_Op_Gt | |
8368 | | Name_Op_Le | |
8369 | | Name_Op_Lt | |
8370 | => | |
51b42ffa AC |
8371 | return |
8372 | Is_Boolean_Type (Result_Type) | |
8373 | and then (Is_Array_Type (Type_1) | |
8374 | or else Is_Scalar_Type (Type_1)); | |
8375 | ||
8376 | when Name_Op_Concat => | |
8377 | return Is_Array_Type (Result_Type); | |
8378 | ||
8379 | when Name_Op_Expon => | |
8380 | return | |
8381 | (Is_Integer_Type (Result_Type) | |
8382 | or else Is_Floating_Point_Type (Result_Type)) | |
8383 | and then Result_Type = Type_1 | |
8384 | and then Type_2 = Standard_Integer; | |
8385 | ||
8386 | when others => | |
8387 | raise Program_Error; | |
8388 | end case; | |
8389 | end; | |
8390 | ||
8391 | -- Unary operator | |
8392 | ||
8393 | else | |
8394 | case Op is | |
d8f43ee6 HK |
8395 | when Name_Op_Abs |
8396 | | Name_Op_Add | |
8397 | | Name_Op_Subtract | |
8398 | => | |
51b42ffa AC |
8399 | return |
8400 | Is_Numeric_Type (Result_Type) | |
8401 | and then Result_Type = Type_1; | |
8402 | ||
8403 | when Name_Op_Not => | |
8404 | return | |
8405 | Is_Boolean_Type (Result_Type) | |
8406 | and then Result_Type = Type_1; | |
8407 | ||
8408 | when others => | |
8409 | raise Program_Error; | |
8410 | end case; | |
8411 | end if; | |
8412 | end Matches_Predefined_Op; | |
8413 | ||
8414 | -- Local variables | |
8415 | ||
996ae0b0 RK |
8416 | E : Entity_Id := Current_Entity_In_Scope (S); |
8417 | C_E : Entity_Id := Current_Entity (S); | |
8418 | ||
51b42ffa AC |
8419 | -- Start of processing for Enter_Overloaded_Entity |
8420 | ||
996ae0b0 RK |
8421 | begin |
8422 | if Present (E) then | |
8423 | Set_Has_Homonym (E); | |
8424 | Set_Has_Homonym (S); | |
8425 | end if; | |
8426 | ||
8427 | Set_Is_Immediately_Visible (S); | |
8428 | Set_Scope (S, Current_Scope); | |
8429 | ||
8430 | -- Chain new entity if front of homonym in current scope, so that | |
8431 | -- homonyms are contiguous. | |
8432 | ||
8fde064e | 8433 | if Present (E) and then E /= C_E then |
996ae0b0 RK |
8434 | while Homonym (C_E) /= E loop |
8435 | C_E := Homonym (C_E); | |
8436 | end loop; | |
8437 | ||
8438 | Set_Homonym (C_E, S); | |
8439 | ||
8440 | else | |
8441 | E := C_E; | |
8442 | Set_Current_Entity (S); | |
8443 | end if; | |
8444 | ||
8445 | Set_Homonym (S, E); | |
8446 | ||
2352eadb AC |
8447 | if Is_Inherited_Operation (S) then |
8448 | Append_Inherited_Subprogram (S); | |
8449 | else | |
8450 | Append_Entity (S, Current_Scope); | |
8451 | end if; | |
8452 | ||
996ae0b0 RK |
8453 | Set_Public_Status (S); |
8454 | ||
8455 | if Debug_Flag_E then | |
8456 | Write_Str ("New overloaded entity chain: "); | |
8457 | Write_Name (Chars (S)); | |
996ae0b0 | 8458 | |
82c80734 | 8459 | E := S; |
996ae0b0 RK |
8460 | while Present (E) loop |
8461 | Write_Str (" "); Write_Int (Int (E)); | |
8462 | E := Homonym (E); | |
8463 | end loop; | |
8464 | ||
8465 | Write_Eol; | |
8466 | end if; | |
8467 | ||
8468 | -- Generate warning for hiding | |
8469 | ||
8470 | if Warn_On_Hiding | |
8471 | and then Comes_From_Source (S) | |
8472 | and then In_Extended_Main_Source_Unit (S) | |
8473 | then | |
8474 | E := S; | |
8475 | loop | |
8476 | E := Homonym (E); | |
8477 | exit when No (E); | |
8478 | ||
7fc53871 AC |
8479 | -- Warn unless genuine overloading. Do not emit warning on |
8480 | -- hiding predefined operators in Standard (these are either an | |
8481 | -- (artifact of our implicit declarations, or simple noise) but | |
8482 | -- keep warning on a operator defined on a local subtype, because | |
8483 | -- of the real danger that different operators may be applied in | |
8484 | -- various parts of the program. | |
996ae0b0 | 8485 | |
1f250383 AC |
8486 | -- Note that if E and S have the same scope, there is never any |
8487 | -- hiding. Either the two conflict, and the program is illegal, | |
8488 | -- or S is overriding an implicit inherited subprogram. | |
8489 | ||
8490 | if Scope (E) /= Scope (S) | |
51b42ffa AC |
8491 | and then (not Is_Overloadable (E) |
8492 | or else Subtype_Conformant (E, S)) | |
8493 | and then (Is_Immediately_Visible (E) | |
8494 | or else Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 8495 | then |
51b42ffa AC |
8496 | if Scope (E) = Standard_Standard then |
8497 | if Nkind (S) = N_Defining_Operator_Symbol | |
8498 | and then Scope (Base_Type (Etype (First_Formal (S)))) /= | |
8499 | Scope (S) | |
8500 | and then Matches_Predefined_Op | |
8501 | then | |
8502 | Error_Msg_N | |
8503 | ("declaration of & hides predefined operator?h?", S); | |
8504 | end if; | |
8505 | ||
8506 | -- E not immediately within Standard | |
8507 | ||
8508 | else | |
7fc53871 | 8509 | Error_Msg_Sloc := Sloc (E); |
3ccedacc | 8510 | Error_Msg_N ("declaration of & hides one #?h?", S); |
7fc53871 | 8511 | end if; |
996ae0b0 RK |
8512 | end if; |
8513 | end loop; | |
8514 | end if; | |
8515 | end Enter_Overloaded_Entity; | |
8516 | ||
e5a58fac AC |
8517 | ----------------------------- |
8518 | -- Check_Untagged_Equality -- | |
8519 | ----------------------------- | |
8520 | ||
8521 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
8522 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
8523 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
8524 | Obj_Decl : Node_Id; | |
8525 | ||
8526 | begin | |
7c0c194b AC |
8527 | -- This check applies only if we have a subprogram declaration with an |
8528 | -- untagged record type. | |
b2834fbd AC |
8529 | |
8530 | if Nkind (Decl) /= N_Subprogram_Declaration | |
8531 | or else not Is_Record_Type (Typ) | |
8532 | or else Is_Tagged_Type (Typ) | |
e5a58fac | 8533 | then |
b2834fbd AC |
8534 | return; |
8535 | end if; | |
e5a58fac | 8536 | |
b2834fbd AC |
8537 | -- In Ada 2012 case, we will output errors or warnings depending on |
8538 | -- the setting of debug flag -gnatd.E. | |
8539 | ||
8540 | if Ada_Version >= Ada_2012 then | |
8541 | Error_Msg_Warn := Debug_Flag_Dot_EE; | |
8542 | ||
8543 | -- In earlier versions of Ada, nothing to do unless we are warning on | |
8544 | -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). | |
8545 | ||
8546 | else | |
8547 | if not Warn_On_Ada_2012_Compatibility then | |
8548 | return; | |
8549 | end if; | |
8550 | end if; | |
8551 | ||
8552 | -- Cases where the type has already been frozen | |
e5a58fac | 8553 | |
b2834fbd AC |
8554 | if Is_Frozen (Typ) then |
8555 | ||
8556 | -- If the type is not declared in a package, or if we are in the body | |
8557 | -- of the package or in some other scope, the new operation is not | |
8558 | -- primitive, and therefore legal, though suspicious. Should we | |
8559 | -- generate a warning in this case ??? | |
8560 | ||
8561 | if Ekind (Scope (Typ)) /= E_Package | |
8562 | or else Scope (Typ) /= Current_Scope | |
8563 | then | |
8564 | return; | |
8565 | ||
8566 | -- If the type is a generic actual (sub)type, the operation is not | |
8567 | -- primitive either because the base type is declared elsewhere. | |
8568 | ||
8569 | elsif Is_Generic_Actual_Type (Typ) then | |
8570 | return; | |
8571 | ||
8572 | -- Here we have a definite error of declaration after freezing | |
8573 | ||
8574 | else | |
8575 | if Ada_Version >= Ada_2012 then | |
ae6ede77 | 8576 | Error_Msg_NE |
3ccedacc | 8577 | ("equality operator must be declared before type & is " |
b2834fbd AC |
8578 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); |
8579 | ||
8580 | -- In Ada 2012 mode with error turned to warning, output one | |
8581 | -- more warning to warn that the equality operation may not | |
8582 | -- compose. This is the consequence of ignoring the error. | |
8583 | ||
8584 | if Error_Msg_Warn then | |
8585 | Error_Msg_N ("\equality operation may not compose??", Eq_Op); | |
8586 | end if; | |
21a5b575 AC |
8587 | |
8588 | else | |
8589 | Error_Msg_NE | |
b2834fbd AC |
8590 | ("equality operator must be declared before type& is " |
8591 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); | |
8592 | end if; | |
8593 | ||
8594 | -- If we are in the package body, we could just move the | |
8595 | -- declaration to the package spec, so add a message saying that. | |
8596 | ||
8597 | if In_Package_Body (Scope (Typ)) then | |
8598 | if Ada_Version >= Ada_2012 then | |
8599 | Error_Msg_N | |
8600 | ("\move declaration to package spec<<", Eq_Op); | |
8601 | else | |
8602 | Error_Msg_N | |
8603 | ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); | |
8604 | end if; | |
21a5b575 | 8605 | |
b2834fbd AC |
8606 | -- Otherwise try to find the freezing point |
8607 | ||
8608 | else | |
21a5b575 | 8609 | Obj_Decl := Next (Parent (Typ)); |
dbfeb4fa | 8610 | while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
21a5b575 AC |
8611 | if Nkind (Obj_Decl) = N_Object_Declaration |
8612 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
8613 | then | |
b2834fbd AC |
8614 | -- Freezing point, output warnings |
8615 | ||
8616 | if Ada_Version >= Ada_2012 then | |
8617 | Error_Msg_NE | |
8618 | ("type& is frozen by declaration??", Obj_Decl, Typ); | |
8619 | Error_Msg_N | |
8620 | ("\an equality operator cannot be declared after " | |
8621 | & "this point??", | |
8622 | Obj_Decl); | |
8623 | else | |
8624 | Error_Msg_NE | |
8625 | ("type& is frozen by declaration (Ada 2012)?y?", | |
8626 | Obj_Decl, Typ); | |
8627 | Error_Msg_N | |
8628 | ("\an equality operator cannot be declared after " | |
8629 | & "this point (Ada 2012)?y?", | |
8630 | Obj_Decl); | |
8631 | end if; | |
8632 | ||
21a5b575 AC |
8633 | exit; |
8634 | end if; | |
8635 | ||
8636 | Next (Obj_Decl); | |
8637 | end loop; | |
8638 | end if; | |
b2834fbd | 8639 | end if; |
e5a58fac | 8640 | |
b2834fbd AC |
8641 | -- Here if type is not frozen yet. It is illegal to have a primitive |
8642 | -- equality declared in the private part if the type is visible. | |
21a5b575 | 8643 | |
b2834fbd AC |
8644 | elsif not In_Same_List (Parent (Typ), Decl) |
8645 | and then not Is_Limited_Type (Typ) | |
8646 | then | |
8647 | -- Shouldn't we give an RM reference here??? | |
21a5b575 | 8648 | |
b2834fbd AC |
8649 | if Ada_Version >= Ada_2012 then |
8650 | Error_Msg_N | |
8651 | ("equality operator appears too late<<", Eq_Op); | |
8652 | else | |
8653 | Error_Msg_N | |
8654 | ("equality operator appears too late (Ada 2012)?y?", Eq_Op); | |
e5a58fac | 8655 | end if; |
b2834fbd AC |
8656 | |
8657 | -- No error detected | |
8658 | ||
8659 | else | |
8660 | return; | |
e5a58fac AC |
8661 | end if; |
8662 | end Check_Untagged_Equality; | |
8663 | ||
996ae0b0 RK |
8664 | ----------------------------- |
8665 | -- Find_Corresponding_Spec -- | |
8666 | ----------------------------- | |
8667 | ||
d44202ba HK |
8668 | function Find_Corresponding_Spec |
8669 | (N : Node_Id; | |
8670 | Post_Error : Boolean := True) return Entity_Id | |
8671 | is | |
996ae0b0 RK |
8672 | Spec : constant Node_Id := Specification (N); |
8673 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
8674 | ||
8675 | E : Entity_Id; | |
8676 | ||
70f4ad20 AC |
8677 | function Different_Generic_Profile (E : Entity_Id) return Boolean; |
8678 | -- Even if fully conformant, a body may depend on a generic actual when | |
8679 | -- the spec does not, or vice versa, in which case they were distinct | |
8680 | -- entities in the generic. | |
8681 | ||
8682 | ------------------------------- | |
8683 | -- Different_Generic_Profile -- | |
8684 | ------------------------------- | |
8685 | ||
8686 | function Different_Generic_Profile (E : Entity_Id) return Boolean is | |
8687 | F1, F2 : Entity_Id; | |
8688 | ||
2995860f AC |
8689 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
8690 | -- Check that the types of corresponding formals have the same | |
8691 | -- generic actual if any. We have to account for subtypes of a | |
8692 | -- generic formal, declared between a spec and a body, which may | |
73999267 AC |
8693 | -- appear distinct in an instance but matched in the generic, and |
8694 | -- the subtype may be used either in the spec or the body of the | |
8695 | -- subprogram being checked. | |
2995860f AC |
8696 | |
8697 | ------------------------- | |
8698 | -- Same_Generic_Actual -- | |
8699 | ------------------------- | |
8700 | ||
8701 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is | |
73999267 AC |
8702 | |
8703 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean; | |
8704 | -- Predicate to check whether S1 is a subtype of S2 in the source | |
8705 | -- of the instance. | |
8706 | ||
8707 | ------------------------- | |
8708 | -- Is_Declared_Subtype -- | |
8709 | ------------------------- | |
8710 | ||
8711 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean is | |
8712 | begin | |
8713 | return Comes_From_Source (Parent (S1)) | |
8714 | and then Nkind (Parent (S1)) = N_Subtype_Declaration | |
8715 | and then Is_Entity_Name (Subtype_Indication (Parent (S1))) | |
8716 | and then Entity (Subtype_Indication (Parent (S1))) = S2; | |
8717 | end Is_Declared_Subtype; | |
8718 | ||
8719 | -- Start of processing for Same_Generic_Actual | |
8720 | ||
2995860f AC |
8721 | begin |
8722 | return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) | |
73999267 AC |
8723 | or else Is_Declared_Subtype (T1, T2) |
8724 | or else Is_Declared_Subtype (T2, T1); | |
2995860f AC |
8725 | end Same_Generic_Actual; |
8726 | ||
8727 | -- Start of processing for Different_Generic_Profile | |
8728 | ||
70f4ad20 | 8729 | begin |
2995860f AC |
8730 | if not In_Instance then |
8731 | return False; | |
8732 | ||
8733 | elsif Ekind (E) = E_Function | |
8734 | and then not Same_Generic_Actual (Etype (E), Etype (Designator)) | |
70f4ad20 AC |
8735 | then |
8736 | return True; | |
8737 | end if; | |
8738 | ||
8739 | F1 := First_Formal (Designator); | |
8740 | F2 := First_Formal (E); | |
70f4ad20 | 8741 | while Present (F1) loop |
2995860f | 8742 | if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
70f4ad20 AC |
8743 | return True; |
8744 | end if; | |
8745 | ||
8746 | Next_Formal (F1); | |
8747 | Next_Formal (F2); | |
8748 | end loop; | |
8749 | ||
8750 | return False; | |
8751 | end Different_Generic_Profile; | |
8752 | ||
8753 | -- Start of processing for Find_Corresponding_Spec | |
8754 | ||
996ae0b0 RK |
8755 | begin |
8756 | E := Current_Entity (Designator); | |
996ae0b0 RK |
8757 | while Present (E) loop |
8758 | ||
8759 | -- We are looking for a matching spec. It must have the same scope, | |
8760 | -- and the same name, and either be type conformant, or be the case | |
8761 | -- of a library procedure spec and its body (which belong to one | |
8762 | -- another regardless of whether they are type conformant or not). | |
8763 | ||
8764 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
8765 | if Current_Scope = Standard_Standard |
8766 | or else (Ekind (E) = Ekind (Designator) | |
586ecbf3 | 8767 | and then Type_Conformant (E, Designator)) |
996ae0b0 RK |
8768 | then |
8769 | -- Within an instantiation, we know that spec and body are | |
70f4ad20 AC |
8770 | -- subtype conformant, because they were subtype conformant in |
8771 | -- the generic. We choose the subtype-conformant entity here as | |
8772 | -- well, to resolve spurious ambiguities in the instance that | |
8773 | -- were not present in the generic (i.e. when two different | |
8774 | -- types are given the same actual). If we are looking for a | |
8775 | -- spec to match a body, full conformance is expected. | |
996ae0b0 RK |
8776 | |
8777 | if In_Instance then | |
c05ba1f1 AC |
8778 | |
8779 | -- Inherit the convention and "ghostness" of the matching | |
8780 | -- spec to ensure proper full and subtype conformance. | |
8781 | ||
996ae0b0 RK |
8782 | Set_Convention (Designator, Convention (E)); |
8783 | ||
0187b60e AC |
8784 | -- Skip past subprogram bodies and subprogram renamings that |
8785 | -- may appear to have a matching spec, but that aren't fully | |
8786 | -- conformant with it. That can occur in cases where an | |
8787 | -- actual type causes unrelated homographs in the instance. | |
8788 | ||
8789 | if Nkind_In (N, N_Subprogram_Body, | |
8790 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 8791 | and then Present (Homonym (E)) |
c7b9d548 | 8792 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
8793 | then |
8794 | goto Next_Entity; | |
8795 | ||
c7b9d548 | 8796 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 | 8797 | goto Next_Entity; |
70f4ad20 AC |
8798 | |
8799 | elsif Different_Generic_Profile (E) then | |
8800 | goto Next_Entity; | |
996ae0b0 RK |
8801 | end if; |
8802 | end if; | |
8803 | ||
25ebc085 AC |
8804 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
8805 | -- null procedures locate the internally generated spec. We | |
8806 | -- enforce mode conformance since a tagged type may inherit | |
8807 | -- from interfaces several null primitives which differ only | |
8808 | -- in the mode of the formals. | |
8809 | ||
8810 | if not (Comes_From_Source (E)) | |
8811 | and then Is_Null_Procedure (E) | |
8812 | and then not Mode_Conformant (Designator, E) | |
8813 | then | |
8814 | null; | |
8815 | ||
4d8f3296 ES |
8816 | -- For null procedures coming from source that are completions, |
8817 | -- analysis of the generated body will establish the link. | |
8818 | ||
8819 | elsif Comes_From_Source (E) | |
8820 | and then Nkind (Spec) = N_Procedure_Specification | |
8821 | and then Null_Present (Spec) | |
8822 | then | |
8823 | return E; | |
8824 | ||
e4bda610 AC |
8825 | -- Expression functions can be completions, but cannot be |
8826 | -- completed by an explicit body. | |
8827 | ||
8828 | elsif Comes_From_Source (E) | |
8829 | and then Comes_From_Source (N) | |
8830 | and then Nkind (N) = N_Subprogram_Body | |
8831 | and then Nkind (Original_Node (Unit_Declaration_Node (E))) = | |
8832 | N_Expression_Function | |
8833 | then | |
8834 | Error_Msg_Sloc := Sloc (E); | |
8835 | Error_Msg_N ("body conflicts with expression function#", N); | |
8836 | return Empty; | |
8837 | ||
25ebc085 | 8838 | elsif not Has_Completion (E) then |
996ae0b0 RK |
8839 | if Nkind (N) /= N_Subprogram_Body_Stub then |
8840 | Set_Corresponding_Spec (N, E); | |
8841 | end if; | |
8842 | ||
8843 | Set_Has_Completion (E); | |
8844 | return E; | |
8845 | ||
8846 | elsif Nkind (Parent (N)) = N_Subunit then | |
8847 | ||
8848 | -- If this is the proper body of a subunit, the completion | |
8849 | -- flag is set when analyzing the stub. | |
8850 | ||
8851 | return E; | |
8852 | ||
70f4ad20 AC |
8853 | -- If E is an internal function with a controlling result that |
8854 | -- was created for an operation inherited by a null extension, | |
8855 | -- it may be overridden by a body without a previous spec (one | |
2995860f | 8856 | -- more reason why these should be shunned). In that case we |
70f4ad20 AC |
8857 | -- remove the generated body if present, because the current |
8858 | -- one is the explicit overriding. | |
81db9d77 ES |
8859 | |
8860 | elsif Ekind (E) = E_Function | |
0791fbe9 | 8861 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
8862 | and then not Comes_From_Source (E) |
8863 | and then Has_Controlling_Result (E) | |
8864 | and then Is_Null_Extension (Etype (E)) | |
8865 | and then Comes_From_Source (Spec) | |
8866 | then | |
8867 | Set_Has_Completion (E, False); | |
8868 | ||
1366997b AC |
8869 | if Expander_Active |
8870 | and then Nkind (Parent (E)) = N_Function_Specification | |
8871 | then | |
81db9d77 ES |
8872 | Remove |
8873 | (Unit_Declaration_Node | |
1366997b AC |
8874 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
8875 | ||
81db9d77 ES |
8876 | return E; |
8877 | ||
1366997b AC |
8878 | -- If expansion is disabled, or if the wrapper function has |
8879 | -- not been generated yet, this a late body overriding an | |
8880 | -- inherited operation, or it is an overriding by some other | |
8881 | -- declaration before the controlling result is frozen. In | |
8882 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
8883 | |
8884 | else | |
8885 | return Empty; | |
8886 | end if; | |
8887 | ||
d44202ba HK |
8888 | -- If the body already exists, then this is an error unless |
8889 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
8890 | -- derived subprogram. It is also legal for an instance to |
8891 | -- contain type conformant overloadable declarations (but the | |
8892 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
8893 | |
8894 | elsif No (Alias (E)) | |
8895 | and then not Is_Intrinsic_Subprogram (E) | |
8896 | and then not In_Instance | |
d44202ba | 8897 | and then Post_Error |
996ae0b0 RK |
8898 | then |
8899 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 8900 | |
07fc65c4 GB |
8901 | if Is_Imported (E) then |
8902 | Error_Msg_NE | |
8903 | ("body not allowed for imported subprogram & declared#", | |
8904 | N, E); | |
8905 | else | |
8906 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
8907 | end if; | |
996ae0b0 RK |
8908 | end if; |
8909 | ||
d44202ba HK |
8910 | -- Child units cannot be overloaded, so a conformance mismatch |
8911 | -- between body and a previous spec is an error. | |
8912 | ||
996ae0b0 RK |
8913 | elsif Is_Child_Unit (E) |
8914 | and then | |
8915 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
8916 | and then | |
5d37ba92 | 8917 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
8918 | N_Compilation_Unit |
8919 | and then Post_Error | |
996ae0b0 | 8920 | then |
996ae0b0 RK |
8921 | Error_Msg_N |
8922 | ("body of child unit does not match previous declaration", N); | |
8923 | end if; | |
8924 | end if; | |
8925 | ||
8926 | <<Next_Entity>> | |
8927 | E := Homonym (E); | |
8928 | end loop; | |
8929 | ||
8930 | -- On exit, we know that no previous declaration of subprogram exists | |
8931 | ||
8932 | return Empty; | |
8933 | end Find_Corresponding_Spec; | |
8934 | ||
8935 | ---------------------- | |
8936 | -- Fully_Conformant -- | |
8937 | ---------------------- | |
8938 | ||
8939 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
8940 | Result : Boolean; | |
996ae0b0 RK |
8941 | begin |
8942 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
8943 | return Result; | |
8944 | end Fully_Conformant; | |
8945 | ||
8946 | ---------------------------------- | |
8947 | -- Fully_Conformant_Expressions -- | |
8948 | ---------------------------------- | |
8949 | ||
8950 | function Fully_Conformant_Expressions | |
8951 | (Given_E1 : Node_Id; | |
d05ef0ab | 8952 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
8953 | is |
8954 | E1 : constant Node_Id := Original_Node (Given_E1); | |
8955 | E2 : constant Node_Id := Original_Node (Given_E2); | |
8956 | -- We always test conformance on original nodes, since it is possible | |
8957 | -- for analysis and/or expansion to make things look as though they | |
8958 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
8959 | ||
8960 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
8961 | renames Fully_Conformant_Expressions; | |
8962 | ||
8963 | function FCL (L1, L2 : List_Id) return Boolean; | |
70f4ad20 AC |
8964 | -- Compare elements of two lists for conformance. Elements have to be |
8965 | -- conformant, and actuals inserted as default parameters do not match | |
8966 | -- explicit actuals with the same value. | |
996ae0b0 RK |
8967 | |
8968 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 8969 | -- Compare an operator node with a function call |
996ae0b0 RK |
8970 | |
8971 | --------- | |
8972 | -- FCL -- | |
8973 | --------- | |
8974 | ||
8975 | function FCL (L1, L2 : List_Id) return Boolean is | |
8976 | N1, N2 : Node_Id; | |
8977 | ||
8978 | begin | |
8979 | if L1 = No_List then | |
8980 | N1 := Empty; | |
8981 | else | |
8982 | N1 := First (L1); | |
8983 | end if; | |
8984 | ||
8985 | if L2 = No_List then | |
8986 | N2 := Empty; | |
8987 | else | |
8988 | N2 := First (L2); | |
8989 | end if; | |
8990 | ||
70f4ad20 | 8991 | -- Compare two lists, skipping rewrite insertions (we want to compare |
a90bd866 | 8992 | -- the original trees, not the expanded versions). |
996ae0b0 RK |
8993 | |
8994 | loop | |
8995 | if Is_Rewrite_Insertion (N1) then | |
8996 | Next (N1); | |
8997 | elsif Is_Rewrite_Insertion (N2) then | |
8998 | Next (N2); | |
8999 | elsif No (N1) then | |
9000 | return No (N2); | |
9001 | elsif No (N2) then | |
9002 | return False; | |
9003 | elsif not FCE (N1, N2) then | |
9004 | return False; | |
9005 | else | |
9006 | Next (N1); | |
9007 | Next (N2); | |
9008 | end if; | |
9009 | end loop; | |
9010 | end FCL; | |
9011 | ||
9012 | --------- | |
9013 | -- FCO -- | |
9014 | --------- | |
9015 | ||
9016 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
9017 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
9018 | Act : Node_Id; | |
9019 | ||
9020 | begin | |
9021 | if No (Actuals) | |
9022 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
9023 | then | |
9024 | return False; | |
9025 | ||
9026 | else | |
9027 | Act := First (Actuals); | |
9028 | ||
9029 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
9030 | if not FCE (Left_Opnd (Op_Node), Act) then |
9031 | return False; | |
9032 | end if; | |
9033 | ||
9034 | Next (Act); | |
9035 | end if; | |
9036 | ||
9037 | return Present (Act) | |
9038 | and then FCE (Right_Opnd (Op_Node), Act) | |
9039 | and then No (Next (Act)); | |
9040 | end if; | |
9041 | end FCO; | |
9042 | ||
9043 | -- Start of processing for Fully_Conformant_Expressions | |
9044 | ||
9045 | begin | |
27bb7941 | 9046 | -- Nonconformant if paren count does not match. Note: if some idiot |
996ae0b0 | 9047 | -- complains that we don't do this right for more than 3 levels of |
a90bd866 | 9048 | -- parentheses, they will be treated with the respect they deserve. |
996ae0b0 RK |
9049 | |
9050 | if Paren_Count (E1) /= Paren_Count (E2) then | |
9051 | return False; | |
9052 | ||
82c80734 RD |
9053 | -- If same entities are referenced, then they are conformant even if |
9054 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
9055 | |
9056 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
9057 | if Present (Entity (E1)) then | |
9058 | return Entity (E1) = Entity (E2) | |
ca0eb951 | 9059 | |
31e358e1 AC |
9060 | -- One may be a discriminant that has been replaced by the |
9061 | -- corresponding discriminal. | |
ca0eb951 | 9062 | |
31e358e1 AC |
9063 | or else |
9064 | (Chars (Entity (E1)) = Chars (Entity (E2)) | |
9065 | and then Ekind (Entity (E1)) = E_Discriminant | |
9066 | and then Ekind (Entity (E2)) = E_In_Parameter) | |
ca0eb951 | 9067 | |
d59179b1 AC |
9068 | -- The discriminant of a protected type is transformed into |
9069 | -- a local constant and then into a parameter of a protected | |
9070 | -- operation. | |
9071 | ||
31e358e1 AC |
9072 | or else |
9073 | (Ekind (Entity (E1)) = E_Constant | |
d59179b1 AC |
9074 | and then Ekind (Entity (E2)) = E_In_Parameter |
9075 | and then Present (Discriminal_Link (Entity (E1))) | |
9076 | and then Discriminal_Link (Entity (E1)) = | |
9077 | Discriminal_Link (Entity (E2))) | |
9078 | ||
804ec349 | 9079 | -- AI12-050: The loop variables of quantified expressions |
27bb7941 | 9080 | -- match if they have the same identifier, even though they |
ca0eb951 AC |
9081 | -- are different entities. |
9082 | ||
31e358e1 AC |
9083 | or else |
9084 | (Chars (Entity (E1)) = Chars (Entity (E2)) | |
9085 | and then Ekind (Entity (E1)) = E_Loop_Parameter | |
9086 | and then Ekind (Entity (E2)) = E_Loop_Parameter); | |
996ae0b0 RK |
9087 | |
9088 | elsif Nkind (E1) = N_Expanded_Name | |
9089 | and then Nkind (E2) = N_Expanded_Name | |
9090 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
9091 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
9092 | then | |
9093 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
9094 | ||
9095 | else | |
9096 | -- Identifiers in component associations don't always have | |
9097 | -- entities, but their names must conform. | |
9098 | ||
9099 | return Nkind (E1) = N_Identifier | |
9100 | and then Nkind (E2) = N_Identifier | |
9101 | and then Chars (E1) = Chars (E2); | |
9102 | end if; | |
9103 | ||
9104 | elsif Nkind (E1) = N_Character_Literal | |
9105 | and then Nkind (E2) = N_Expanded_Name | |
9106 | then | |
9107 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
9108 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
9109 | ||
9110 | elsif Nkind (E2) = N_Character_Literal | |
9111 | and then Nkind (E1) = N_Expanded_Name | |
9112 | then | |
9113 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
9114 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
9115 | ||
8fde064e | 9116 | elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
996ae0b0 RK |
9117 | return FCO (E1, E2); |
9118 | ||
8fde064e | 9119 | elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
996ae0b0 RK |
9120 | return FCO (E2, E1); |
9121 | ||
9122 | -- Otherwise we must have the same syntactic entity | |
9123 | ||
9124 | elsif Nkind (E1) /= Nkind (E2) then | |
9125 | return False; | |
9126 | ||
9127 | -- At this point, we specialize by node type | |
9128 | ||
9129 | else | |
9130 | case Nkind (E1) is | |
996ae0b0 RK |
9131 | when N_Aggregate => |
9132 | return | |
9133 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
9134 | and then |
9135 | FCL (Component_Associations (E1), | |
9136 | Component_Associations (E2)); | |
996ae0b0 RK |
9137 | |
9138 | when N_Allocator => | |
9139 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
9140 | or else | |
9141 | Nkind (Expression (E2)) = N_Qualified_Expression | |
9142 | then | |
9143 | return FCE (Expression (E1), Expression (E2)); | |
9144 | ||
9145 | -- Check that the subtype marks and any constraints | |
9146 | -- are conformant | |
9147 | ||
9148 | else | |
9149 | declare | |
9150 | Indic1 : constant Node_Id := Expression (E1); | |
9151 | Indic2 : constant Node_Id := Expression (E2); | |
9152 | Elt1 : Node_Id; | |
9153 | Elt2 : Node_Id; | |
9154 | ||
9155 | begin | |
9156 | if Nkind (Indic1) /= N_Subtype_Indication then | |
9157 | return | |
9158 | Nkind (Indic2) /= N_Subtype_Indication | |
9159 | and then Entity (Indic1) = Entity (Indic2); | |
9160 | ||
9161 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
9162 | return | |
9163 | Nkind (Indic1) /= N_Subtype_Indication | |
9164 | and then Entity (Indic1) = Entity (Indic2); | |
9165 | ||
9166 | else | |
9167 | if Entity (Subtype_Mark (Indic1)) /= | |
9168 | Entity (Subtype_Mark (Indic2)) | |
9169 | then | |
9170 | return False; | |
9171 | end if; | |
9172 | ||
9173 | Elt1 := First (Constraints (Constraint (Indic1))); | |
9174 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
9175 | while Present (Elt1) and then Present (Elt2) loop |
9176 | if not FCE (Elt1, Elt2) then | |
9177 | return False; | |
9178 | end if; | |
9179 | ||
9180 | Next (Elt1); | |
9181 | Next (Elt2); | |
9182 | end loop; | |
9183 | ||
9184 | return True; | |
9185 | end if; | |
9186 | end; | |
9187 | end if; | |
9188 | ||
9189 | when N_Attribute_Reference => | |
9190 | return | |
9191 | Attribute_Name (E1) = Attribute_Name (E2) | |
9192 | and then FCL (Expressions (E1), Expressions (E2)); | |
9193 | ||
9194 | when N_Binary_Op => | |
9195 | return | |
9196 | Entity (E1) = Entity (E2) | |
9197 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
9198 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
9199 | ||
d8f43ee6 HK |
9200 | when N_Membership_Test |
9201 | | N_Short_Circuit | |
9202 | => | |
996ae0b0 RK |
9203 | return |
9204 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
9205 | and then | |
9206 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
9207 | ||
19d846a0 RD |
9208 | when N_Case_Expression => |
9209 | declare | |
9210 | Alt1 : Node_Id; | |
9211 | Alt2 : Node_Id; | |
9212 | ||
9213 | begin | |
9214 | if not FCE (Expression (E1), Expression (E2)) then | |
9215 | return False; | |
9216 | ||
9217 | else | |
9218 | Alt1 := First (Alternatives (E1)); | |
9219 | Alt2 := First (Alternatives (E2)); | |
9220 | loop | |
9221 | if Present (Alt1) /= Present (Alt2) then | |
9222 | return False; | |
9223 | elsif No (Alt1) then | |
9224 | return True; | |
9225 | end if; | |
9226 | ||
9227 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
9228 | or else not FCL (Discrete_Choices (Alt1), | |
9229 | Discrete_Choices (Alt2)) | |
9230 | then | |
9231 | return False; | |
9232 | end if; | |
9233 | ||
9234 | Next (Alt1); | |
9235 | Next (Alt2); | |
9236 | end loop; | |
9237 | end if; | |
9238 | end; | |
9239 | ||
996ae0b0 RK |
9240 | when N_Character_Literal => |
9241 | return | |
9242 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
9243 | ||
9244 | when N_Component_Association => | |
9245 | return | |
9246 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
9247 | and then |
9248 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 9249 | |
996ae0b0 RK |
9250 | when N_Explicit_Dereference => |
9251 | return | |
9252 | FCE (Prefix (E1), Prefix (E2)); | |
9253 | ||
9254 | when N_Extension_Aggregate => | |
9255 | return | |
9256 | FCL (Expressions (E1), Expressions (E2)) | |
9257 | and then Null_Record_Present (E1) = | |
9258 | Null_Record_Present (E2) | |
9259 | and then FCL (Component_Associations (E1), | |
9260 | Component_Associations (E2)); | |
9261 | ||
9262 | when N_Function_Call => | |
9263 | return | |
9264 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
9265 | and then |
9266 | FCL (Parameter_Associations (E1), | |
9267 | Parameter_Associations (E2)); | |
996ae0b0 | 9268 | |
9b16cb57 RD |
9269 | when N_If_Expression => |
9270 | return | |
9271 | FCL (Expressions (E1), Expressions (E2)); | |
9272 | ||
996ae0b0 RK |
9273 | when N_Indexed_Component => |
9274 | return | |
9275 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9276 | and then |
9277 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
9278 | |
9279 | when N_Integer_Literal => | |
9280 | return (Intval (E1) = Intval (E2)); | |
9281 | ||
9282 | when N_Null => | |
9283 | return True; | |
9284 | ||
9285 | when N_Operator_Symbol => | |
9286 | return | |
9287 | Chars (E1) = Chars (E2); | |
9288 | ||
9289 | when N_Others_Choice => | |
9290 | return True; | |
9291 | ||
9292 | when N_Parameter_Association => | |
9293 | return | |
7dae9ca0 | 9294 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
996ae0b0 RK |
9295 | and then FCE (Explicit_Actual_Parameter (E1), |
9296 | Explicit_Actual_Parameter (E2)); | |
9297 | ||
304757d2 AC |
9298 | when N_Qualified_Expression |
9299 | | N_Type_Conversion | |
9300 | | N_Unchecked_Type_Conversion | |
9301 | => | |
996ae0b0 RK |
9302 | return |
9303 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
9304 | and then |
9305 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 9306 | |
2010d078 AC |
9307 | when N_Quantified_Expression => |
9308 | if not FCE (Condition (E1), Condition (E2)) then | |
9309 | return False; | |
9310 | end if; | |
9311 | ||
9312 | if Present (Loop_Parameter_Specification (E1)) | |
9313 | and then Present (Loop_Parameter_Specification (E2)) | |
9314 | then | |
9315 | declare | |
9316 | L1 : constant Node_Id := | |
9317 | Loop_Parameter_Specification (E1); | |
9318 | L2 : constant Node_Id := | |
9319 | Loop_Parameter_Specification (E2); | |
9320 | ||
9321 | begin | |
9322 | return | |
9323 | Reverse_Present (L1) = Reverse_Present (L2) | |
9324 | and then | |
9325 | FCE (Defining_Identifier (L1), | |
9326 | Defining_Identifier (L2)) | |
9327 | and then | |
9328 | FCE (Discrete_Subtype_Definition (L1), | |
9329 | Discrete_Subtype_Definition (L2)); | |
9330 | end; | |
9331 | ||
804670f1 AC |
9332 | elsif Present (Iterator_Specification (E1)) |
9333 | and then Present (Iterator_Specification (E2)) | |
9334 | then | |
2010d078 AC |
9335 | declare |
9336 | I1 : constant Node_Id := Iterator_Specification (E1); | |
9337 | I2 : constant Node_Id := Iterator_Specification (E2); | |
9338 | ||
9339 | begin | |
9340 | return | |
9341 | FCE (Defining_Identifier (I1), | |
9342 | Defining_Identifier (I2)) | |
9343 | and then | |
9344 | Of_Present (I1) = Of_Present (I2) | |
9345 | and then | |
9346 | Reverse_Present (I1) = Reverse_Present (I2) | |
9347 | and then FCE (Name (I1), Name (I2)) | |
9348 | and then FCE (Subtype_Indication (I1), | |
9349 | Subtype_Indication (I2)); | |
9350 | end; | |
804670f1 AC |
9351 | |
9352 | -- The quantified expressions used different specifications to | |
9353 | -- walk their respective ranges. | |
9354 | ||
9355 | else | |
9356 | return False; | |
2010d078 AC |
9357 | end if; |
9358 | ||
996ae0b0 RK |
9359 | when N_Range => |
9360 | return | |
9361 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
9362 | and then |
9363 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
9364 | |
9365 | when N_Real_Literal => | |
9366 | return (Realval (E1) = Realval (E2)); | |
9367 | ||
9368 | when N_Selected_Component => | |
9369 | return | |
9370 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9371 | and then |
9372 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
9373 | |
9374 | when N_Slice => | |
9375 | return | |
9376 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9377 | and then |
9378 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
9379 | |
9380 | when N_String_Literal => | |
9381 | declare | |
9382 | S1 : constant String_Id := Strval (E1); | |
9383 | S2 : constant String_Id := Strval (E2); | |
9384 | L1 : constant Nat := String_Length (S1); | |
9385 | L2 : constant Nat := String_Length (S2); | |
9386 | ||
9387 | begin | |
9388 | if L1 /= L2 then | |
9389 | return False; | |
9390 | ||
9391 | else | |
9392 | for J in 1 .. L1 loop | |
9393 | if Get_String_Char (S1, J) /= | |
9394 | Get_String_Char (S2, J) | |
9395 | then | |
9396 | return False; | |
9397 | end if; | |
9398 | end loop; | |
9399 | ||
9400 | return True; | |
9401 | end if; | |
9402 | end; | |
9403 | ||
996ae0b0 RK |
9404 | when N_Unary_Op => |
9405 | return | |
9406 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
9407 | and then |
9408 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 | 9409 | |
996ae0b0 RK |
9410 | -- All other node types cannot appear in this context. Strictly |
9411 | -- we should raise a fatal internal error. Instead we just ignore | |
9412 | -- the nodes. This means that if anyone makes a mistake in the | |
2995860f AC |
9413 | -- expander and mucks an expression tree irretrievably, the result |
9414 | -- will be a failure to detect a (probably very obscure) case | |
9415 | -- of non-conformance, which is better than bombing on some | |
996ae0b0 RK |
9416 | -- case where two expressions do in fact conform. |
9417 | ||
9418 | when others => | |
9419 | return True; | |
996ae0b0 RK |
9420 | end case; |
9421 | end if; | |
9422 | end Fully_Conformant_Expressions; | |
9423 | ||
fbf5a39b AC |
9424 | ---------------------------------------- |
9425 | -- Fully_Conformant_Discrete_Subtypes -- | |
9426 | ---------------------------------------- | |
9427 | ||
9428 | function Fully_Conformant_Discrete_Subtypes | |
9429 | (Given_S1 : Node_Id; | |
d05ef0ab | 9430 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
9431 | is |
9432 | S1 : constant Node_Id := Original_Node (Given_S1); | |
9433 | S2 : constant Node_Id := Original_Node (Given_S2); | |
9434 | ||
9435 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
9436 | -- Special-case for a bound given by a discriminant, which in the body |
9437 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
9438 | |
9439 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 9440 | -- Check both bounds |
fbf5a39b | 9441 | |
5d37ba92 ES |
9442 | ----------------------- |
9443 | -- Conforming_Bounds -- | |
9444 | ----------------------- | |
9445 | ||
fbf5a39b AC |
9446 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
9447 | begin | |
9448 | if Is_Entity_Name (B1) | |
9449 | and then Is_Entity_Name (B2) | |
9450 | and then Ekind (Entity (B1)) = E_Discriminant | |
9451 | then | |
9452 | return Chars (B1) = Chars (B2); | |
9453 | ||
9454 | else | |
9455 | return Fully_Conformant_Expressions (B1, B2); | |
9456 | end if; | |
9457 | end Conforming_Bounds; | |
9458 | ||
5d37ba92 ES |
9459 | ----------------------- |
9460 | -- Conforming_Ranges -- | |
9461 | ----------------------- | |
9462 | ||
fbf5a39b AC |
9463 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
9464 | begin | |
9465 | return | |
9466 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
9467 | and then | |
9468 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
9469 | end Conforming_Ranges; | |
9470 | ||
9471 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
9472 | ||
9473 | begin | |
9474 | if Nkind (S1) /= Nkind (S2) then | |
9475 | return False; | |
9476 | ||
9477 | elsif Is_Entity_Name (S1) then | |
9478 | return Entity (S1) = Entity (S2); | |
9479 | ||
9480 | elsif Nkind (S1) = N_Range then | |
9481 | return Conforming_Ranges (S1, S2); | |
9482 | ||
9483 | elsif Nkind (S1) = N_Subtype_Indication then | |
9484 | return | |
9485 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
9486 | and then | |
9487 | Conforming_Ranges | |
9488 | (Range_Expression (Constraint (S1)), | |
9489 | Range_Expression (Constraint (S2))); | |
9490 | else | |
9491 | return True; | |
9492 | end if; | |
9493 | end Fully_Conformant_Discrete_Subtypes; | |
9494 | ||
996ae0b0 RK |
9495 | -------------------- |
9496 | -- Install_Entity -- | |
9497 | -------------------- | |
9498 | ||
9499 | procedure Install_Entity (E : Entity_Id) is | |
9500 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
9501 | begin |
9502 | Set_Is_Immediately_Visible (E); | |
9503 | Set_Current_Entity (E); | |
9504 | Set_Homonym (E, Prev); | |
9505 | end Install_Entity; | |
9506 | ||
9507 | --------------------- | |
9508 | -- Install_Formals -- | |
9509 | --------------------- | |
9510 | ||
9511 | procedure Install_Formals (Id : Entity_Id) is | |
9512 | F : Entity_Id; | |
996ae0b0 RK |
9513 | begin |
9514 | F := First_Formal (Id); | |
996ae0b0 RK |
9515 | while Present (F) loop |
9516 | Install_Entity (F); | |
9517 | Next_Formal (F); | |
9518 | end loop; | |
9519 | end Install_Formals; | |
9520 | ||
ce2b6ba5 JM |
9521 | ----------------------------- |
9522 | -- Is_Interface_Conformant -- | |
9523 | ----------------------------- | |
9524 | ||
9525 | function Is_Interface_Conformant | |
9526 | (Tagged_Type : Entity_Id; | |
9527 | Iface_Prim : Entity_Id; | |
9528 | Prim : Entity_Id) return Boolean | |
9529 | is | |
9e92ad49 AC |
9530 | -- The operation may in fact be an inherited (implicit) operation |
9531 | -- rather than the original interface primitive, so retrieve the | |
9532 | -- ultimate ancestor. | |
9533 | ||
9534 | Iface : constant Entity_Id := | |
9535 | Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); | |
fceeaab6 ES |
9536 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
9537 | ||
25ebc085 AC |
9538 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
9539 | -- Return the controlling formal of Prim | |
9540 | ||
59e6b23c AC |
9541 | ------------------------ |
9542 | -- Controlling_Formal -- | |
9543 | ------------------------ | |
9544 | ||
25ebc085 | 9545 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
15918371 | 9546 | E : Entity_Id; |
59e6b23c | 9547 | |
25ebc085 | 9548 | begin |
15918371 | 9549 | E := First_Entity (Prim); |
25ebc085 AC |
9550 | while Present (E) loop |
9551 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
9552 | return E; | |
9553 | end if; | |
9554 | ||
9555 | Next_Entity (E); | |
9556 | end loop; | |
9557 | ||
9558 | return Empty; | |
9559 | end Controlling_Formal; | |
9560 | ||
9561 | -- Local variables | |
9562 | ||
9563 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
9564 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
9565 | ||
9566 | -- Start of processing for Is_Interface_Conformant | |
9567 | ||
ce2b6ba5 JM |
9568 | begin |
9569 | pragma Assert (Is_Subprogram (Iface_Prim) | |
9570 | and then Is_Subprogram (Prim) | |
9571 | and then Is_Dispatching_Operation (Iface_Prim) | |
9572 | and then Is_Dispatching_Operation (Prim)); | |
9573 | ||
fceeaab6 | 9574 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
9575 | or else (Present (Alias (Iface_Prim)) |
9576 | and then | |
9577 | Is_Interface | |
9578 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
9579 | ||
9580 | if Prim = Iface_Prim | |
9581 | or else not Is_Subprogram (Prim) | |
9582 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
9583 | or else not Is_Dispatching_Operation (Prim) | |
9584 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 | 9585 | or else No (Typ) |
8a49a499 | 9586 | or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
ce2b6ba5 JM |
9587 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
9588 | then | |
9589 | return False; | |
9590 | ||
25ebc085 AC |
9591 | -- The mode of the controlling formals must match |
9592 | ||
9593 | elsif Present (Iface_Ctrl_F) | |
15918371 AC |
9594 | and then Present (Prim_Ctrl_F) |
9595 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
25ebc085 AC |
9596 | then |
9597 | return False; | |
9598 | ||
9599 | -- Case of a procedure, or a function whose result type matches the | |
9600 | -- result type of the interface primitive, or a function that has no | |
9601 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
9602 | |
9603 | elsif Ekind (Iface_Prim) = E_Procedure | |
9604 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 9605 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 9606 | then |
b4d7b435 AC |
9607 | return Type_Conformant |
9608 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 9609 | |
2995860f AC |
9610 | -- Case of a function returning an interface, or an access to one. Check |
9611 | -- that the return types correspond. | |
ce2b6ba5 | 9612 | |
fceeaab6 ES |
9613 | elsif Implements_Interface (Typ, Iface) then |
9614 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
9615 | /= |
9616 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
9617 | then |
9618 | return False; | |
fceeaab6 ES |
9619 | else |
9620 | return | |
9e92ad49 | 9621 | Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
ce2b6ba5 | 9622 | Skip_Controlling_Formals => True); |
fceeaab6 | 9623 | end if; |
ce2b6ba5 | 9624 | |
fceeaab6 ES |
9625 | else |
9626 | return False; | |
ce2b6ba5 | 9627 | end if; |
ce2b6ba5 JM |
9628 | end Is_Interface_Conformant; |
9629 | ||
996ae0b0 RK |
9630 | --------------------------------- |
9631 | -- Is_Non_Overriding_Operation -- | |
9632 | --------------------------------- | |
9633 | ||
9634 | function Is_Non_Overriding_Operation | |
9635 | (Prev_E : Entity_Id; | |
d05ef0ab | 9636 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
9637 | is |
9638 | Formal : Entity_Id; | |
9639 | F_Typ : Entity_Id; | |
9640 | G_Typ : Entity_Id := Empty; | |
9641 | ||
9642 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
9643 | -- If F_Type is a derived type associated with a generic actual subtype, |
9644 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
9645 | |
9646 | function Types_Correspond | |
9647 | (P_Type : Entity_Id; | |
d05ef0ab | 9648 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
9649 | -- Returns true if and only if the types (or designated types in the |
9650 | -- case of anonymous access types) are the same or N_Type is derived | |
9651 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
9652 | |
9653 | ----------------------------- | |
9654 | -- Get_Generic_Parent_Type -- | |
9655 | ----------------------------- | |
9656 | ||
9657 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
9658 | G_Typ : Entity_Id; | |
702d2020 | 9659 | Defn : Node_Id; |
996ae0b0 RK |
9660 | Indic : Node_Id; |
9661 | ||
9662 | begin | |
9663 | if Is_Derived_Type (F_Typ) | |
9664 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
9665 | then | |
82c80734 RD |
9666 | -- The tree must be traversed to determine the parent subtype in |
9667 | -- the generic unit, which unfortunately isn't always available | |
9668 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
9669 | -- is needed for cases where a full derived type has been | |
9670 | -- rewritten.) | |
996ae0b0 | 9671 | |
bff469f7 AC |
9672 | -- If the parent type is a scalar type, the derivation creates |
9673 | -- an anonymous base type for it, and the source type is its | |
9674 | -- first subtype. | |
9675 | ||
9676 | if Is_Scalar_Type (F_Typ) | |
9677 | and then not Comes_From_Source (F_Typ) | |
9678 | then | |
9679 | Defn := | |
9680 | Type_Definition | |
0c6826a5 | 9681 | (Original_Node (Parent (First_Subtype (F_Typ)))); |
bff469f7 AC |
9682 | else |
9683 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); | |
9684 | end if; | |
702d2020 AC |
9685 | if Nkind (Defn) = N_Derived_Type_Definition then |
9686 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 9687 | |
702d2020 AC |
9688 | if Nkind (Indic) = N_Subtype_Indication then |
9689 | G_Typ := Entity (Subtype_Mark (Indic)); | |
9690 | else | |
9691 | G_Typ := Entity (Indic); | |
9692 | end if; | |
996ae0b0 | 9693 | |
702d2020 AC |
9694 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
9695 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
9696 | then | |
9697 | return Generic_Parent_Type (Parent (G_Typ)); | |
9698 | end if; | |
996ae0b0 RK |
9699 | end if; |
9700 | end if; | |
9701 | ||
9702 | return Empty; | |
9703 | end Get_Generic_Parent_Type; | |
9704 | ||
9705 | ---------------------- | |
9706 | -- Types_Correspond -- | |
9707 | ---------------------- | |
9708 | ||
9709 | function Types_Correspond | |
9710 | (P_Type : Entity_Id; | |
d05ef0ab | 9711 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
9712 | is |
9713 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
9714 | New_Type : Entity_Id := Base_Type (N_Type); | |
9715 | ||
9716 | begin | |
9717 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
9718 | Prev_Type := Designated_Type (Prev_Type); | |
9719 | end if; | |
9720 | ||
9721 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
9722 | New_Type := Designated_Type (New_Type); | |
9723 | end if; | |
9724 | ||
9725 | if Prev_Type = New_Type then | |
9726 | return True; | |
9727 | ||
9728 | elsif not Is_Class_Wide_Type (New_Type) then | |
9729 | while Etype (New_Type) /= New_Type loop | |
9730 | New_Type := Etype (New_Type); | |
0c6826a5 | 9731 | |
996ae0b0 RK |
9732 | if New_Type = Prev_Type then |
9733 | return True; | |
9734 | end if; | |
9735 | end loop; | |
9736 | end if; | |
9737 | return False; | |
9738 | end Types_Correspond; | |
9739 | ||
9740 | -- Start of processing for Is_Non_Overriding_Operation | |
9741 | ||
9742 | begin | |
82c80734 RD |
9743 | -- In the case where both operations are implicit derived subprograms |
9744 | -- then neither overrides the other. This can only occur in certain | |
9745 | -- obscure cases (e.g., derivation from homographs created in a generic | |
9746 | -- instantiation). | |
996ae0b0 RK |
9747 | |
9748 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
9749 | return True; | |
9750 | ||
9751 | elsif Ekind (Current_Scope) = E_Package | |
9752 | and then Is_Generic_Instance (Current_Scope) | |
9753 | and then In_Private_Part (Current_Scope) | |
9754 | and then Comes_From_Source (New_E) | |
9755 | then | |
702d2020 AC |
9756 | -- We examine the formals and result type of the inherited operation, |
9757 | -- to determine whether their type is derived from (the instance of) | |
9758 | -- a generic type. The first such formal or result type is the one | |
9759 | -- tested. | |
996ae0b0 RK |
9760 | |
9761 | Formal := First_Formal (Prev_E); | |
ae4c4d53 | 9762 | F_Typ := Empty; |
996ae0b0 RK |
9763 | while Present (Formal) loop |
9764 | F_Typ := Base_Type (Etype (Formal)); | |
9765 | ||
9766 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
9767 | F_Typ := Designated_Type (F_Typ); | |
9768 | end if; | |
9769 | ||
9770 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 9771 | exit when Present (G_Typ); |
996ae0b0 RK |
9772 | |
9773 | Next_Formal (Formal); | |
9774 | end loop; | |
9775 | ||
890975e3 | 9776 | -- If the function dispatches on result check the result type |
ae4c4d53 | 9777 | |
c8ef728f | 9778 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
9779 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
9780 | end if; | |
9781 | ||
9782 | if No (G_Typ) then | |
9783 | return False; | |
9784 | end if; | |
9785 | ||
8dbd1460 AC |
9786 | -- If the generic type is a private type, then the original operation |
9787 | -- was not overriding in the generic, because there was no primitive | |
9788 | -- operation to override. | |
996ae0b0 RK |
9789 | |
9790 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
9791 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 9792 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
9793 | then |
9794 | return True; | |
9795 | ||
9796 | -- The generic parent type is the ancestor of a formal derived | |
9797 | -- type declaration. We need to check whether it has a primitive | |
9798 | -- operation that should be overridden by New_E in the generic. | |
9799 | ||
9800 | else | |
9801 | declare | |
9802 | P_Formal : Entity_Id; | |
9803 | N_Formal : Entity_Id; | |
9804 | P_Typ : Entity_Id; | |
9805 | N_Typ : Entity_Id; | |
9806 | P_Prim : Entity_Id; | |
9807 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
9808 | ||
9809 | begin | |
9810 | while Present (Prim_Elt) loop | |
9811 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 9812 | |
996ae0b0 RK |
9813 | if Chars (P_Prim) = Chars (New_E) |
9814 | and then Ekind (P_Prim) = Ekind (New_E) | |
9815 | then | |
9816 | P_Formal := First_Formal (P_Prim); | |
9817 | N_Formal := First_Formal (New_E); | |
9818 | while Present (P_Formal) and then Present (N_Formal) loop | |
9819 | P_Typ := Etype (P_Formal); | |
9820 | N_Typ := Etype (N_Formal); | |
9821 | ||
9822 | if not Types_Correspond (P_Typ, N_Typ) then | |
9823 | exit; | |
9824 | end if; | |
9825 | ||
9826 | Next_Entity (P_Formal); | |
9827 | Next_Entity (N_Formal); | |
9828 | end loop; | |
9829 | ||
82c80734 RD |
9830 | -- Found a matching primitive operation belonging to the |
9831 | -- formal ancestor type, so the new subprogram is | |
9832 | -- overriding. | |
996ae0b0 | 9833 | |
c8ef728f ES |
9834 | if No (P_Formal) |
9835 | and then No (N_Formal) | |
996ae0b0 RK |
9836 | and then (Ekind (New_E) /= E_Function |
9837 | or else | |
8fde064e AC |
9838 | Types_Correspond |
9839 | (Etype (P_Prim), Etype (New_E))) | |
996ae0b0 RK |
9840 | then |
9841 | return False; | |
9842 | end if; | |
9843 | end if; | |
9844 | ||
9845 | Next_Elmt (Prim_Elt); | |
9846 | end loop; | |
9847 | ||
2995860f AC |
9848 | -- If no match found, then the new subprogram does not override |
9849 | -- in the generic (nor in the instance). | |
996ae0b0 | 9850 | |
260359e3 AC |
9851 | -- If the type in question is not abstract, and the subprogram |
9852 | -- is, this will be an error if the new operation is in the | |
9853 | -- private part of the instance. Emit a warning now, which will | |
9854 | -- make the subsequent error message easier to understand. | |
9855 | ||
ae4c4d53 | 9856 | if Present (F_Typ) and then not Is_Abstract_Type (F_Typ) |
260359e3 AC |
9857 | and then Is_Abstract_Subprogram (Prev_E) |
9858 | and then In_Private_Part (Current_Scope) | |
9859 | then | |
9860 | Error_Msg_Node_2 := F_Typ; | |
9861 | Error_Msg_NE | |
3ccedacc AC |
9862 | ("private operation& in generic unit does not override " |
9863 | & "any primitive operation of& (RM 12.3 (18))??", | |
260359e3 AC |
9864 | New_E, New_E); |
9865 | end if; | |
9866 | ||
996ae0b0 RK |
9867 | return True; |
9868 | end; | |
9869 | end if; | |
9870 | else | |
9871 | return False; | |
9872 | end if; | |
9873 | end Is_Non_Overriding_Operation; | |
9874 | ||
beacce02 AC |
9875 | ------------------------------------- |
9876 | -- List_Inherited_Pre_Post_Aspects -- | |
9877 | ------------------------------------- | |
9878 | ||
9879 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
9880 | begin | |
e606088a | 9881 | if Opt.List_Inherited_Aspects |
b9696ffb | 9882 | and then Is_Subprogram_Or_Generic_Subprogram (E) |
beacce02 AC |
9883 | then |
9884 | declare | |
c9d70ab1 AC |
9885 | Subps : constant Subprogram_List := Inherited_Subprograms (E); |
9886 | Items : Node_Id; | |
9887 | Prag : Node_Id; | |
beacce02 AC |
9888 | |
9889 | begin | |
c9d70ab1 AC |
9890 | for Index in Subps'Range loop |
9891 | Items := Contract (Subps (Index)); | |
9892 | ||
9893 | if Present (Items) then | |
9894 | Prag := Pre_Post_Conditions (Items); | |
9895 | while Present (Prag) loop | |
9896 | Error_Msg_Sloc := Sloc (Prag); | |
9897 | ||
9898 | if Class_Present (Prag) | |
9899 | and then not Split_PPC (Prag) | |
9900 | then | |
6e759c2a | 9901 | if Pragma_Name (Prag) = Name_Precondition then |
c9d70ab1 AC |
9902 | Error_Msg_N |
9903 | ("info: & inherits `Pre''Class` aspect from " | |
9904 | & "#?L?", E); | |
9905 | else | |
9906 | Error_Msg_N | |
9907 | ("info: & inherits `Post''Class` aspect from " | |
9908 | & "#?L?", E); | |
9909 | end if; | |
beacce02 | 9910 | end if; |
beacce02 | 9911 | |
c9d70ab1 AC |
9912 | Prag := Next_Pragma (Prag); |
9913 | end loop; | |
9914 | end if; | |
beacce02 AC |
9915 | end loop; |
9916 | end; | |
9917 | end if; | |
9918 | end List_Inherited_Pre_Post_Aspects; | |
9919 | ||
996ae0b0 RK |
9920 | ------------------------------ |
9921 | -- Make_Inequality_Operator -- | |
9922 | ------------------------------ | |
9923 | ||
9924 | -- S is the defining identifier of an equality operator. We build a | |
9925 | -- subprogram declaration with the right signature. This operation is | |
9926 | -- intrinsic, because it is always expanded as the negation of the | |
9927 | -- call to the equality function. | |
9928 | ||
9929 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
9930 | Loc : constant Source_Ptr := Sloc (S); | |
9931 | Decl : Node_Id; | |
9932 | Formals : List_Id; | |
9933 | Op_Name : Entity_Id; | |
9934 | ||
c8ef728f ES |
9935 | FF : constant Entity_Id := First_Formal (S); |
9936 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
9937 | |
9938 | begin | |
c8ef728f | 9939 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 9940 | |
c8ef728f | 9941 | if No (NF) then |
996ae0b0 RK |
9942 | return; |
9943 | end if; | |
9944 | ||
c8ef728f ES |
9945 | declare |
9946 | A : constant Entity_Id := | |
9947 | Make_Defining_Identifier (Sloc (FF), | |
9948 | Chars => Chars (FF)); | |
9949 | ||
5d37ba92 ES |
9950 | B : constant Entity_Id := |
9951 | Make_Defining_Identifier (Sloc (NF), | |
9952 | Chars => Chars (NF)); | |
c8ef728f ES |
9953 | |
9954 | begin | |
9955 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
9956 | ||
9957 | Formals := New_List ( | |
9958 | Make_Parameter_Specification (Loc, | |
9959 | Defining_Identifier => A, | |
9960 | Parameter_Type => | |
e4494292 | 9961 | New_Occurrence_Of (Etype (First_Formal (S)), |
c8ef728f ES |
9962 | Sloc (Etype (First_Formal (S))))), |
9963 | ||
9964 | Make_Parameter_Specification (Loc, | |
9965 | Defining_Identifier => B, | |
9966 | Parameter_Type => | |
e4494292 | 9967 | New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
c8ef728f ES |
9968 | Sloc (Etype (Next_Formal (First_Formal (S))))))); |
9969 | ||
9970 | Decl := | |
9971 | Make_Subprogram_Declaration (Loc, | |
9972 | Specification => | |
9973 | Make_Function_Specification (Loc, | |
9974 | Defining_Unit_Name => Op_Name, | |
9975 | Parameter_Specifications => Formals, | |
9976 | Result_Definition => | |
e4494292 | 9977 | New_Occurrence_Of (Standard_Boolean, Loc))); |
c8ef728f ES |
9978 | |
9979 | -- Insert inequality right after equality if it is explicit or after | |
9980 | -- the derived type when implicit. These entities are created only | |
2995860f AC |
9981 | -- for visibility purposes, and eventually replaced in the course |
9982 | -- of expansion, so they do not need to be attached to the tree and | |
9983 | -- seen by the back-end. Keeping them internal also avoids spurious | |
c8ef728f ES |
9984 | -- freezing problems. The declaration is inserted in the tree for |
9985 | -- analysis, and removed afterwards. If the equality operator comes | |
9986 | -- from an explicit declaration, attach the inequality immediately | |
9987 | -- after. Else the equality is inherited from a derived type | |
9988 | -- declaration, so insert inequality after that declaration. | |
9989 | ||
9990 | if No (Alias (S)) then | |
9991 | Insert_After (Unit_Declaration_Node (S), Decl); | |
9992 | elsif Is_List_Member (Parent (S)) then | |
9993 | Insert_After (Parent (S), Decl); | |
9994 | else | |
9995 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
9996 | end if; | |
996ae0b0 | 9997 | |
c8ef728f ES |
9998 | Mark_Rewrite_Insertion (Decl); |
9999 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
10000 | Analyze (Decl); | |
10001 | Remove (Decl); | |
10002 | Set_Has_Completion (Op_Name); | |
10003 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 10004 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 10005 | end; |
996ae0b0 RK |
10006 | end Make_Inequality_Operator; |
10007 | ||
10008 | ---------------------- | |
10009 | -- May_Need_Actuals -- | |
10010 | ---------------------- | |
10011 | ||
10012 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
10013 | F : Entity_Id; | |
10014 | B : Boolean; | |
10015 | ||
10016 | begin | |
10017 | F := First_Formal (Fun); | |
10018 | B := True; | |
996ae0b0 RK |
10019 | while Present (F) loop |
10020 | if No (Default_Value (F)) then | |
10021 | B := False; | |
10022 | exit; | |
10023 | end if; | |
10024 | ||
10025 | Next_Formal (F); | |
10026 | end loop; | |
10027 | ||
10028 | Set_Needs_No_Actuals (Fun, B); | |
10029 | end May_Need_Actuals; | |
10030 | ||
10031 | --------------------- | |
10032 | -- Mode_Conformant -- | |
10033 | --------------------- | |
10034 | ||
10035 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
10036 | Result : Boolean; | |
996ae0b0 RK |
10037 | begin |
10038 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
10039 | return Result; | |
10040 | end Mode_Conformant; | |
10041 | ||
10042 | --------------------------- | |
10043 | -- New_Overloaded_Entity -- | |
10044 | --------------------------- | |
10045 | ||
10046 | procedure New_Overloaded_Entity | |
10047 | (S : Entity_Id; | |
10048 | Derived_Type : Entity_Id := Empty) | |
10049 | is | |
ec4867fa | 10050 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
10051 | -- Set if the current scope has an operation that is type-conformant |
10052 | -- with S, and becomes hidden by S. | |
10053 | ||
5d37ba92 ES |
10054 | Is_Primitive_Subp : Boolean; |
10055 | -- Set to True if the new subprogram is primitive | |
10056 | ||
fbf5a39b AC |
10057 | E : Entity_Id; |
10058 | -- Entity that S overrides | |
10059 | ||
996ae0b0 | 10060 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
10061 | -- Predecessor of E in Homonym chain |
10062 | ||
5d37ba92 ES |
10063 | procedure Check_For_Primitive_Subprogram |
10064 | (Is_Primitive : out Boolean; | |
10065 | Is_Overriding : Boolean := False); | |
10066 | -- If the subprogram being analyzed is a primitive operation of the type | |
10067 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
10068 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
10069 | -- corresponding flag on the entity itself for later use. | |
10070 | ||
42f11e4c AC |
10071 | function Has_Matching_Entry_Or_Subprogram (E : Entity_Id) return Boolean; |
10072 | -- True if a) E is a subprogram whose first formal is a concurrent type | |
10073 | -- defined in the scope of E that has some entry or subprogram whose | |
10074 | -- profile matches E, or b) E is an internally built dispatching | |
10075 | -- subprogram of a protected type and there is a matching subprogram | |
10076 | -- defined in the enclosing scope of the protected type, or c) E is | |
10077 | -- an entry of a synchronized type and a matching procedure has been | |
10078 | -- previously defined in the enclosing scope of the synchronized type. | |
758c442c | 10079 | |
996ae0b0 RK |
10080 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
10081 | -- Check that E is declared in the private part of the current package, | |
10082 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 10083 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
10084 | -- set when freezing entities, so we must examine the place of the |
10085 | -- declaration in the tree, and recognize wrapper packages as well. | |
10086 | ||
2ddc2000 AC |
10087 | function Is_Overriding_Alias |
10088 | (Old_E : Entity_Id; | |
10089 | New_E : Entity_Id) return Boolean; | |
10090 | -- Check whether new subprogram and old subprogram are both inherited | |
10091 | -- from subprograms that have distinct dispatch table entries. This can | |
2995860f AC |
10092 | -- occur with derivations from instances with accidental homonyms. The |
10093 | -- function is conservative given that the converse is only true within | |
10094 | -- instances that contain accidental overloadings. | |
2ddc2000 | 10095 | |
42f11e4c | 10096 | procedure Report_Conflict (S : Entity_Id; E : Entity_Id); |
ca90b962 | 10097 | -- Report conflict between entities S and E |
42f11e4c | 10098 | |
5d37ba92 ES |
10099 | ------------------------------------ |
10100 | -- Check_For_Primitive_Subprogram -- | |
10101 | ------------------------------------ | |
996ae0b0 | 10102 | |
5d37ba92 ES |
10103 | procedure Check_For_Primitive_Subprogram |
10104 | (Is_Primitive : out Boolean; | |
10105 | Is_Overriding : Boolean := False) | |
ec4867fa | 10106 | is |
996ae0b0 RK |
10107 | Formal : Entity_Id; |
10108 | F_Typ : Entity_Id; | |
07fc65c4 | 10109 | B_Typ : Entity_Id; |
996ae0b0 RK |
10110 | |
10111 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
10112 | -- Returns true if T is declared in the visible part of the current |
10113 | -- package scope; otherwise returns false. Assumes that T is declared | |
10114 | -- in a package. | |
996ae0b0 RK |
10115 | |
10116 | procedure Check_Private_Overriding (T : Entity_Id); | |
10117 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
10118 | -- abstract type is declared in a private part, then it must override |
10119 | -- an abstract subprogram declared in the visible part. Also checks | |
10120 | -- that if a primitive function with a controlling result is declared | |
10121 | -- in a private part, then it must override a function declared in | |
10122 | -- the visible part. | |
996ae0b0 RK |
10123 | |
10124 | ------------------------------ | |
10125 | -- Check_Private_Overriding -- | |
10126 | ------------------------------ | |
10127 | ||
10128 | procedure Check_Private_Overriding (T : Entity_Id) is | |
6672e402 AC |
10129 | function Overrides_Private_Part_Op return Boolean; |
10130 | -- This detects the special case where the overriding subprogram | |
10131 | -- is overriding a subprogram that was declared in the same | |
10132 | -- private part. That case is illegal by 3.9.3(10). | |
acf624f2 | 10133 | |
aaeb3b3a AC |
10134 | function Overrides_Visible_Function |
10135 | (Partial_View : Entity_Id) return Boolean; | |
acf624f2 BD |
10136 | -- True if S overrides a function in the visible part. The |
10137 | -- overridden function could be explicitly or implicitly declared. | |
10138 | ||
6672e402 AC |
10139 | ------------------------------- |
10140 | -- Overrides_Private_Part_Op -- | |
10141 | ------------------------------- | |
10142 | ||
10143 | function Overrides_Private_Part_Op return Boolean is | |
10144 | Over_Decl : constant Node_Id := | |
10145 | Unit_Declaration_Node (Overridden_Operation (S)); | |
10146 | Subp_Decl : constant Node_Id := Unit_Declaration_Node (S); | |
10147 | ||
10148 | begin | |
10149 | pragma Assert (Is_Overriding); | |
10150 | pragma Assert | |
10151 | (Nkind (Over_Decl) = N_Abstract_Subprogram_Declaration); | |
10152 | pragma Assert | |
10153 | (Nkind (Subp_Decl) = N_Abstract_Subprogram_Declaration); | |
10154 | ||
10155 | return In_Same_List (Over_Decl, Subp_Decl); | |
10156 | end Overrides_Private_Part_Op; | |
10157 | ||
10158 | -------------------------------- | |
10159 | -- Overrides_Visible_Function -- | |
10160 | -------------------------------- | |
bc38dbb4 | 10161 | |
aaeb3b3a AC |
10162 | function Overrides_Visible_Function |
10163 | (Partial_View : Entity_Id) return Boolean | |
10164 | is | |
acf624f2 BD |
10165 | begin |
10166 | if not Is_Overriding or else not Has_Homonym (S) then | |
10167 | return False; | |
10168 | end if; | |
10169 | ||
aaeb3b3a | 10170 | if not Present (Partial_View) then |
acf624f2 BD |
10171 | return True; |
10172 | end if; | |
10173 | ||
10174 | -- Search through all the homonyms H of S in the current | |
10175 | -- package spec, and return True if we find one that matches. | |
10176 | -- Note that Parent (H) will be the declaration of the | |
aaeb3b3a | 10177 | -- partial view of T for a match. |
acf624f2 BD |
10178 | |
10179 | declare | |
10180 | H : Entity_Id := S; | |
10181 | begin | |
10182 | loop | |
10183 | H := Homonym (H); | |
10184 | exit when not Present (H) or else Scope (H) /= Scope (S); | |
10185 | ||
10186 | if Nkind_In | |
10187 | (Parent (H), | |
10188 | N_Private_Extension_Declaration, | |
10189 | N_Private_Type_Declaration) | |
aaeb3b3a | 10190 | and then Defining_Identifier (Parent (H)) = Partial_View |
acf624f2 BD |
10191 | then |
10192 | return True; | |
10193 | end if; | |
10194 | end loop; | |
10195 | end; | |
10196 | ||
10197 | return False; | |
10198 | end Overrides_Visible_Function; | |
10199 | ||
10200 | -- Start of processing for Check_Private_Overriding | |
10201 | ||
996ae0b0 | 10202 | begin |
51c16e29 | 10203 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
10204 | and then In_Private_Part (Current_Scope) |
10205 | and then Visible_Part_Type (T) | |
10206 | and then not In_Instance | |
10207 | then | |
f937473f RD |
10208 | if Is_Abstract_Type (T) |
10209 | and then Is_Abstract_Subprogram (S) | |
10210 | and then (not Is_Overriding | |
bc38dbb4 | 10211 | or else not Is_Abstract_Subprogram (E) |
6672e402 | 10212 | or else Overrides_Private_Part_Op) |
996ae0b0 | 10213 | then |
6672e402 AC |
10214 | Error_Msg_N |
10215 | ("abstract subprograms must be visible (RM 3.9.3(10))!", | |
10216 | S); | |
758c442c | 10217 | |
aaeb3b3a AC |
10218 | elsif Ekind (S) = E_Function then |
10219 | declare | |
10220 | Partial_View : constant Entity_Id := | |
10221 | Incomplete_Or_Partial_View (T); | |
2e79de51 | 10222 | |
aaeb3b3a AC |
10223 | begin |
10224 | if not Overrides_Visible_Function (Partial_View) then | |
10225 | ||
10226 | -- Here, S is "function ... return T;" declared in | |
10227 | -- the private part, not overriding some visible | |
10228 | -- operation. That's illegal in the tagged case | |
10229 | -- (but not if the private type is untagged). | |
10230 | ||
10231 | if ((Present (Partial_View) | |
10232 | and then Is_Tagged_Type (Partial_View)) | |
10233 | or else (not Present (Partial_View) | |
10234 | and then Is_Tagged_Type (T))) | |
10235 | and then T = Base_Type (Etype (S)) | |
10236 | then | |
10237 | Error_Msg_N | |
10238 | ("private function with tagged result must" | |
10239 | & " override visible-part function", S); | |
10240 | Error_Msg_N | |
10241 | ("\move subprogram to the visible part" | |
10242 | & " (RM 3.9.3(10))", S); | |
10243 | ||
10244 | -- AI05-0073: extend this test to the case of a | |
10245 | -- function with a controlling access result. | |
10246 | ||
10247 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
10248 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
10249 | and then | |
10250 | not Is_Class_Wide_Type | |
10251 | (Designated_Type (Etype (S))) | |
10252 | and then Ada_Version >= Ada_2012 | |
10253 | then | |
10254 | Error_Msg_N | |
10255 | ("private function with controlling access " | |
10256 | & "result must override visible-part function", | |
10257 | S); | |
10258 | Error_Msg_N | |
10259 | ("\move subprogram to the visible part" | |
10260 | & " (RM 3.9.3(10))", S); | |
10261 | end if; | |
10262 | end if; | |
10263 | end; | |
996ae0b0 RK |
10264 | end if; |
10265 | end if; | |
10266 | end Check_Private_Overriding; | |
10267 | ||
10268 | ----------------------- | |
10269 | -- Visible_Part_Type -- | |
10270 | ----------------------- | |
10271 | ||
10272 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 | 10273 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
996ae0b0 RK |
10274 | |
10275 | begin | |
8dbd1460 AC |
10276 | -- If the entity is a private type, then it must be declared in a |
10277 | -- visible part. | |
996ae0b0 RK |
10278 | |
10279 | if Ekind (T) in Private_Kind then | |
10280 | return True; | |
996ae0b0 | 10281 | |
3e5400f4 PMR |
10282 | elsif Is_Type (T) and then Has_Private_Declaration (T) then |
10283 | return True; | |
996ae0b0 | 10284 | |
3e5400f4 PMR |
10285 | elsif Is_List_Member (Declaration_Node (T)) |
10286 | and then List_Containing (Declaration_Node (T)) = | |
10287 | Visible_Declarations (Specification (P)) | |
10288 | then | |
10289 | return True; | |
996ae0b0 | 10290 | |
3e5400f4 PMR |
10291 | else |
10292 | return False; | |
10293 | end if; | |
996ae0b0 RK |
10294 | end Visible_Part_Type; |
10295 | ||
5d37ba92 | 10296 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
10297 | |
10298 | begin | |
5d37ba92 ES |
10299 | Is_Primitive := False; |
10300 | ||
996ae0b0 RK |
10301 | if not Comes_From_Source (S) then |
10302 | null; | |
10303 | ||
5d37ba92 | 10304 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
10305 | |
10306 | elsif Current_Scope = Standard_Standard then | |
10307 | null; | |
10308 | ||
b9b2405f | 10309 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 10310 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 10311 | or else Is_Overriding |
996ae0b0 | 10312 | then |
07fc65c4 | 10313 | -- For function, check return type |
996ae0b0 | 10314 | |
07fc65c4 | 10315 | if Ekind (S) = E_Function then |
5d37ba92 ES |
10316 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
10317 | F_Typ := Designated_Type (Etype (S)); | |
10318 | else | |
10319 | F_Typ := Etype (S); | |
10320 | end if; | |
10321 | ||
10322 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 10323 | |
5d37ba92 ES |
10324 | if Scope (B_Typ) = Current_Scope |
10325 | and then not Is_Class_Wide_Type (B_Typ) | |
10326 | and then not Is_Generic_Type (B_Typ) | |
10327 | then | |
10328 | Is_Primitive := True; | |
07fc65c4 | 10329 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 10330 | Set_Is_Primitive (S); |
07fc65c4 | 10331 | Check_Private_Overriding (B_Typ); |
4179af27 | 10332 | |
d65a80fd HK |
10333 | -- The Ghost policy in effect at the point of declaration |
10334 | -- or a tagged type and a primitive operation must match | |
4179af27 HK |
10335 | -- (SPARK RM 6.9(16)). |
10336 | ||
10337 | Check_Ghost_Primitive (S, B_Typ); | |
07fc65c4 | 10338 | end if; |
996ae0b0 RK |
10339 | end if; |
10340 | ||
07fc65c4 | 10341 | -- For all subprograms, check formals |
996ae0b0 | 10342 | |
07fc65c4 | 10343 | Formal := First_Formal (S); |
996ae0b0 RK |
10344 | while Present (Formal) loop |
10345 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
10346 | F_Typ := Designated_Type (Etype (Formal)); | |
10347 | else | |
10348 | F_Typ := Etype (Formal); | |
10349 | end if; | |
10350 | ||
07fc65c4 GB |
10351 | B_Typ := Base_Type (F_Typ); |
10352 | ||
ec4867fa ES |
10353 | if Ekind (B_Typ) = E_Access_Subtype then |
10354 | B_Typ := Base_Type (B_Typ); | |
10355 | end if; | |
10356 | ||
5d37ba92 ES |
10357 | if Scope (B_Typ) = Current_Scope |
10358 | and then not Is_Class_Wide_Type (B_Typ) | |
10359 | and then not Is_Generic_Type (B_Typ) | |
10360 | then | |
10361 | Is_Primitive := True; | |
10362 | Set_Is_Primitive (S); | |
07fc65c4 GB |
10363 | Set_Has_Primitive_Operations (B_Typ); |
10364 | Check_Private_Overriding (B_Typ); | |
4179af27 | 10365 | |
d65a80fd HK |
10366 | -- The Ghost policy in effect at the point of declaration |
10367 | -- of a tagged type and a primitive operation must match | |
4179af27 HK |
10368 | -- (SPARK RM 6.9(16)). |
10369 | ||
10370 | Check_Ghost_Primitive (S, B_Typ); | |
996ae0b0 RK |
10371 | end if; |
10372 | ||
10373 | Next_Formal (Formal); | |
10374 | end loop; | |
1aee1fb3 AC |
10375 | |
10376 | -- Special case: An equality function can be redefined for a type | |
10377 | -- occurring in a declarative part, and won't otherwise be treated as | |
10378 | -- a primitive because it doesn't occur in a package spec and doesn't | |
10379 | -- override an inherited subprogram. It's important that we mark it | |
10380 | -- primitive so it can be returned by Collect_Primitive_Operations | |
10381 | -- and be used in composing the equality operation of later types | |
10382 | -- that have a component of the type. | |
10383 | ||
10384 | elsif Chars (S) = Name_Op_Eq | |
10385 | and then Etype (S) = Standard_Boolean | |
10386 | then | |
10387 | B_Typ := Base_Type (Etype (First_Formal (S))); | |
10388 | ||
10389 | if Scope (B_Typ) = Current_Scope | |
10390 | and then | |
10391 | Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ | |
10392 | and then not Is_Limited_Type (B_Typ) | |
10393 | then | |
10394 | Is_Primitive := True; | |
10395 | Set_Is_Primitive (S); | |
10396 | Set_Has_Primitive_Operations (B_Typ); | |
10397 | Check_Private_Overriding (B_Typ); | |
4179af27 HK |
10398 | |
10399 | -- The Ghost policy in effect at the point of declaration of a | |
10400 | -- tagged type and a primitive operation must match | |
10401 | -- (SPARK RM 6.9(16)). | |
10402 | ||
10403 | Check_Ghost_Primitive (S, B_Typ); | |
1aee1fb3 | 10404 | end if; |
996ae0b0 | 10405 | end if; |
5d37ba92 ES |
10406 | end Check_For_Primitive_Subprogram; |
10407 | ||
42f11e4c AC |
10408 | -------------------------------------- |
10409 | -- Has_Matching_Entry_Or_Subprogram -- | |
10410 | -------------------------------------- | |
5d37ba92 | 10411 | |
bac5ba15 AC |
10412 | function Has_Matching_Entry_Or_Subprogram |
10413 | (E : Entity_Id) return Boolean | |
5d37ba92 | 10414 | is |
42f11e4c AC |
10415 | function Check_Conforming_Parameters |
10416 | (E1_Param : Node_Id; | |
10417 | E2_Param : Node_Id) return Boolean; | |
10418 | -- Starting from the given parameters, check that all the parameters | |
ca90b962 GD |
10419 | -- of two entries or subprograms are subtype conformant. Used to skip |
10420 | -- the check on the controlling argument. | |
42f11e4c AC |
10421 | |
10422 | function Matching_Entry_Or_Subprogram | |
10423 | (Conc_Typ : Entity_Id; | |
10424 | Subp : Entity_Id) return Entity_Id; | |
10425 | -- Return the first entry or subprogram of the given concurrent type | |
10426 | -- whose name matches the name of Subp and has a profile conformant | |
10427 | -- with Subp; return Empty if not found. | |
10428 | ||
10429 | function Matching_Dispatching_Subprogram | |
10430 | (Conc_Typ : Entity_Id; | |
10431 | Ent : Entity_Id) return Entity_Id; | |
10432 | -- Return the first dispatching primitive of Conc_Type defined in the | |
ca90b962 | 10433 | -- enclosing scope of Conc_Type (i.e. before the full definition of |
42f11e4c AC |
10434 | -- this concurrent type) whose name matches the entry Ent and has a |
10435 | -- profile conformant with the profile of the corresponding (not yet | |
10436 | -- built) dispatching primitive of Ent; return Empty if not found. | |
10437 | ||
10438 | function Matching_Original_Protected_Subprogram | |
10439 | (Prot_Typ : Entity_Id; | |
10440 | Subp : Entity_Id) return Entity_Id; | |
10441 | -- Return the first subprogram defined in the enclosing scope of | |
10442 | -- Prot_Typ (before the full definition of this protected type) | |
10443 | -- whose name matches the original name of Subp and has a profile | |
10444 | -- conformant with the profile of Subp; return Empty if not found. | |
10445 | ||
10446 | --------------------------------- | |
8016e567 | 10447 | -- Check_Conforming_Parameters -- |
42f11e4c AC |
10448 | --------------------------------- |
10449 | ||
10450 | function Check_Conforming_Parameters | |
10451 | (E1_Param : Node_Id; | |
10452 | E2_Param : Node_Id) return Boolean | |
8aa15e3b | 10453 | is |
42f11e4c AC |
10454 | Param_E1 : Node_Id := E1_Param; |
10455 | Param_E2 : Node_Id := E2_Param; | |
8aa15e3b JM |
10456 | |
10457 | begin | |
42f11e4c | 10458 | while Present (Param_E1) and then Present (Param_E2) loop |
bac5ba15 AC |
10459 | if Ekind (Defining_Identifier (Param_E1)) /= |
10460 | Ekind (Defining_Identifier (Param_E2)) | |
42f11e4c | 10461 | or else not |
bac5ba15 AC |
10462 | Conforming_Types |
10463 | (Find_Parameter_Type (Param_E1), | |
10464 | Find_Parameter_Type (Param_E2), | |
10465 | Subtype_Conformant) | |
15e4986c | 10466 | then |
42f11e4c | 10467 | return False; |
8aa15e3b JM |
10468 | end if; |
10469 | ||
42f11e4c AC |
10470 | Next (Param_E1); |
10471 | Next (Param_E2); | |
10472 | end loop; | |
8aa15e3b | 10473 | |
42f11e4c AC |
10474 | -- The candidate is not valid if one of the two lists contains |
10475 | -- more parameters than the other | |
8aa15e3b | 10476 | |
42f11e4c AC |
10477 | return No (Param_E1) and then No (Param_E2); |
10478 | end Check_Conforming_Parameters; | |
8aa15e3b | 10479 | |
42f11e4c AC |
10480 | ---------------------------------- |
10481 | -- Matching_Entry_Or_Subprogram -- | |
10482 | ---------------------------------- | |
8aa15e3b | 10483 | |
42f11e4c AC |
10484 | function Matching_Entry_Or_Subprogram |
10485 | (Conc_Typ : Entity_Id; | |
10486 | Subp : Entity_Id) return Entity_Id | |
10487 | is | |
10488 | E : Entity_Id; | |
8aa15e3b | 10489 | |
42f11e4c AC |
10490 | begin |
10491 | E := First_Entity (Conc_Typ); | |
10492 | while Present (E) loop | |
10493 | if Chars (Subp) = Chars (E) | |
10494 | and then (Ekind (E) = E_Entry or else Is_Subprogram (E)) | |
10495 | and then | |
10496 | Check_Conforming_Parameters | |
10497 | (First (Parameter_Specifications (Parent (E))), | |
10498 | Next (First (Parameter_Specifications (Parent (Subp))))) | |
8aa15e3b | 10499 | then |
42f11e4c | 10500 | return E; |
8aa15e3b JM |
10501 | end if; |
10502 | ||
42f11e4c | 10503 | Next_Entity (E); |
8aa15e3b JM |
10504 | end loop; |
10505 | ||
42f11e4c AC |
10506 | return Empty; |
10507 | end Matching_Entry_Or_Subprogram; | |
8aa15e3b | 10508 | |
42f11e4c AC |
10509 | ------------------------------------- |
10510 | -- Matching_Dispatching_Subprogram -- | |
10511 | ------------------------------------- | |
8aa15e3b | 10512 | |
42f11e4c AC |
10513 | function Matching_Dispatching_Subprogram |
10514 | (Conc_Typ : Entity_Id; | |
10515 | Ent : Entity_Id) return Entity_Id | |
10516 | is | |
10517 | E : Entity_Id; | |
8aa15e3b | 10518 | |
42f11e4c AC |
10519 | begin |
10520 | -- Search for entities in the enclosing scope of this synchonized | |
bac5ba15 | 10521 | -- type. |
8aa15e3b | 10522 | |
42f11e4c AC |
10523 | pragma Assert (Is_Concurrent_Type (Conc_Typ)); |
10524 | Push_Scope (Scope (Conc_Typ)); | |
10525 | E := Current_Entity_In_Scope (Ent); | |
10526 | Pop_Scope; | |
5d37ba92 | 10527 | |
42f11e4c AC |
10528 | while Present (E) loop |
10529 | if Scope (E) = Scope (Conc_Typ) | |
10530 | and then Comes_From_Source (E) | |
10531 | and then Ekind (E) = E_Procedure | |
10532 | and then Present (First_Entity (E)) | |
10533 | and then Is_Controlling_Formal (First_Entity (E)) | |
10534 | and then Etype (First_Entity (E)) = Conc_Typ | |
10535 | and then | |
10536 | Check_Conforming_Parameters | |
10537 | (First (Parameter_Specifications (Parent (Ent))), | |
10538 | Next (First (Parameter_Specifications (Parent (E))))) | |
10539 | then | |
10540 | return E; | |
10541 | end if; | |
5d37ba92 | 10542 | |
42f11e4c AC |
10543 | E := Homonym (E); |
10544 | end loop; | |
5d37ba92 | 10545 | |
42f11e4c AC |
10546 | return Empty; |
10547 | end Matching_Dispatching_Subprogram; | |
5d37ba92 | 10548 | |
42f11e4c AC |
10549 | -------------------------------------------- |
10550 | -- Matching_Original_Protected_Subprogram -- | |
10551 | -------------------------------------------- | |
5d37ba92 | 10552 | |
42f11e4c AC |
10553 | function Matching_Original_Protected_Subprogram |
10554 | (Prot_Typ : Entity_Id; | |
10555 | Subp : Entity_Id) return Entity_Id | |
10556 | is | |
10557 | ICF : constant Boolean := | |
10558 | Is_Controlling_Formal (First_Entity (Subp)); | |
10559 | E : Entity_Id; | |
8aa15e3b | 10560 | |
42f11e4c AC |
10561 | begin |
10562 | -- Temporarily decorate the first parameter of Subp as controlling | |
bac5ba15 | 10563 | -- formal, required to invoke Subtype_Conformant. |
5d37ba92 | 10564 | |
42f11e4c | 10565 | Set_Is_Controlling_Formal (First_Entity (Subp)); |
5d37ba92 | 10566 | |
42f11e4c AC |
10567 | E := |
10568 | Current_Entity_In_Scope (Original_Protected_Subprogram (Subp)); | |
8aa15e3b | 10569 | |
42f11e4c AC |
10570 | while Present (E) loop |
10571 | if Scope (E) = Scope (Prot_Typ) | |
10572 | and then Comes_From_Source (E) | |
10573 | and then Ekind (Subp) = Ekind (E) | |
10574 | and then Present (First_Entity (E)) | |
10575 | and then Is_Controlling_Formal (First_Entity (E)) | |
10576 | and then Etype (First_Entity (E)) = Prot_Typ | |
10577 | and then Subtype_Conformant (Subp, E, | |
10578 | Skip_Controlling_Formals => True) | |
10579 | then | |
10580 | Set_Is_Controlling_Formal (First_Entity (Subp), ICF); | |
10581 | return E; | |
10582 | end if; | |
8c3dd7a8 | 10583 | |
42f11e4c AC |
10584 | E := Homonym (E); |
10585 | end loop; | |
5d37ba92 | 10586 | |
42f11e4c | 10587 | Set_Is_Controlling_Formal (First_Entity (Subp), ICF); |
bac5ba15 | 10588 | |
42f11e4c AC |
10589 | return Empty; |
10590 | end Matching_Original_Protected_Subprogram; | |
5d37ba92 | 10591 | |
42f11e4c | 10592 | -- Start of processing for Has_Matching_Entry_Or_Subprogram |
5d37ba92 | 10593 | |
42f11e4c AC |
10594 | begin |
10595 | -- Case 1: E is a subprogram whose first formal is a concurrent type | |
10596 | -- defined in the scope of E that has an entry or subprogram whose | |
10597 | -- profile matches E. | |
10598 | ||
10599 | if Comes_From_Source (E) | |
10600 | and then Is_Subprogram (E) | |
10601 | and then Present (First_Entity (E)) | |
10602 | and then Is_Concurrent_Record_Type (Etype (First_Entity (E))) | |
10603 | then | |
10604 | if Scope (E) = | |
bac5ba15 AC |
10605 | Scope (Corresponding_Concurrent_Type |
10606 | (Etype (First_Entity (E)))) | |
42f11e4c AC |
10607 | and then |
10608 | Present | |
10609 | (Matching_Entry_Or_Subprogram | |
10610 | (Corresponding_Concurrent_Type (Etype (First_Entity (E))), | |
10611 | Subp => E)) | |
10612 | then | |
10613 | Report_Conflict (E, | |
10614 | Matching_Entry_Or_Subprogram | |
10615 | (Corresponding_Concurrent_Type (Etype (First_Entity (E))), | |
10616 | Subp => E)); | |
10617 | return True; | |
5d37ba92 | 10618 | end if; |
8aa15e3b | 10619 | |
42f11e4c AC |
10620 | -- Case 2: E is an internally built dispatching subprogram of a |
10621 | -- protected type and there is a subprogram defined in the enclosing | |
10622 | -- scope of the protected type that has the original name of E and | |
10623 | -- its profile is conformant with the profile of E. We check the | |
10624 | -- name of the original protected subprogram associated with E since | |
10625 | -- the expander builds dispatching primitives of protected functions | |
ca90b962 | 10626 | -- and procedures with other names (see Exp_Ch9.Build_Selected_Name). |
42f11e4c AC |
10627 | |
10628 | elsif not Comes_From_Source (E) | |
10629 | and then Is_Subprogram (E) | |
10630 | and then Present (First_Entity (E)) | |
10631 | and then Is_Concurrent_Record_Type (Etype (First_Entity (E))) | |
10632 | and then Present (Original_Protected_Subprogram (E)) | |
10633 | and then | |
10634 | Present | |
10635 | (Matching_Original_Protected_Subprogram | |
bac5ba15 AC |
10636 | (Corresponding_Concurrent_Type (Etype (First_Entity (E))), |
10637 | Subp => E)) | |
42f11e4c AC |
10638 | then |
10639 | Report_Conflict (E, | |
10640 | Matching_Original_Protected_Subprogram | |
10641 | (Corresponding_Concurrent_Type (Etype (First_Entity (E))), | |
10642 | Subp => E)); | |
10643 | return True; | |
8aa15e3b | 10644 | |
ca90b962 | 10645 | -- Case 3: E is an entry of a synchronized type and a matching |
42f11e4c | 10646 | -- procedure has been previously defined in the enclosing scope |
ca90b962 | 10647 | -- of the synchronized type. |
8aa15e3b | 10648 | |
42f11e4c AC |
10649 | elsif Comes_From_Source (E) |
10650 | and then Ekind (E) = E_Entry | |
10651 | and then | |
10652 | Present (Matching_Dispatching_Subprogram (Current_Scope, E)) | |
10653 | then | |
10654 | Report_Conflict (E, | |
10655 | Matching_Dispatching_Subprogram (Current_Scope, E)); | |
10656 | return True; | |
5d37ba92 ES |
10657 | end if; |
10658 | ||
42f11e4c AC |
10659 | return False; |
10660 | end Has_Matching_Entry_Or_Subprogram; | |
5d37ba92 ES |
10661 | |
10662 | ---------------------------- | |
10663 | -- Is_Private_Declaration -- | |
10664 | ---------------------------- | |
10665 | ||
10666 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
5d37ba92 | 10667 | Decl : constant Node_Id := Unit_Declaration_Node (E); |
bac5ba15 | 10668 | Priv_Decls : List_Id; |
5d37ba92 ES |
10669 | |
10670 | begin | |
10671 | if Is_Package_Or_Generic_Package (Current_Scope) | |
10672 | and then In_Private_Part (Current_Scope) | |
10673 | then | |
10674 | Priv_Decls := | |
d12b19fa | 10675 | Private_Declarations (Package_Specification (Current_Scope)); |
5d37ba92 ES |
10676 | |
10677 | return In_Package_Body (Current_Scope) | |
10678 | or else | |
10679 | (Is_List_Member (Decl) | |
a4901c08 | 10680 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 10681 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
10682 | and then not |
10683 | Is_Compilation_Unit | |
10684 | (Defining_Entity (Parent (Decl))) | |
10685 | and then List_Containing (Parent (Parent (Decl))) = | |
10686 | Priv_Decls); | |
5d37ba92 ES |
10687 | else |
10688 | return False; | |
10689 | end if; | |
10690 | end Is_Private_Declaration; | |
996ae0b0 | 10691 | |
2ddc2000 AC |
10692 | -------------------------- |
10693 | -- Is_Overriding_Alias -- | |
10694 | -------------------------- | |
10695 | ||
10696 | function Is_Overriding_Alias | |
10697 | (Old_E : Entity_Id; | |
10698 | New_E : Entity_Id) return Boolean | |
10699 | is | |
10700 | AO : constant Entity_Id := Alias (Old_E); | |
10701 | AN : constant Entity_Id := Alias (New_E); | |
bac5ba15 | 10702 | |
2ddc2000 AC |
10703 | begin |
10704 | return Scope (AO) /= Scope (AN) | |
10705 | or else No (DTC_Entity (AO)) | |
10706 | or else No (DTC_Entity (AN)) | |
10707 | or else DT_Position (AO) = DT_Position (AN); | |
10708 | end Is_Overriding_Alias; | |
10709 | ||
42f11e4c AC |
10710 | --------------------- |
10711 | -- Report_Conflict -- | |
10712 | --------------------- | |
10713 | ||
10714 | procedure Report_Conflict (S : Entity_Id; E : Entity_Id) is | |
10715 | begin | |
10716 | Error_Msg_Sloc := Sloc (E); | |
10717 | ||
10718 | -- Generate message, with useful additional warning if in generic | |
10719 | ||
10720 | if Is_Generic_Unit (E) then | |
10721 | Error_Msg_N ("previous generic unit cannot be overloaded", S); | |
10722 | Error_Msg_N ("\& conflicts with declaration#", S); | |
10723 | else | |
10724 | Error_Msg_N ("& conflicts with declaration#", S); | |
10725 | end if; | |
10726 | end Report_Conflict; | |
10727 | ||
996ae0b0 RK |
10728 | -- Start of processing for New_Overloaded_Entity |
10729 | ||
10730 | begin | |
fbf5a39b AC |
10731 | -- We need to look for an entity that S may override. This must be a |
10732 | -- homonym in the current scope, so we look for the first homonym of | |
10733 | -- S in the current scope as the starting point for the search. | |
10734 | ||
10735 | E := Current_Entity_In_Scope (S); | |
10736 | ||
947430d5 AC |
10737 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
10738 | -- They are directly added to the list of primitive operations of | |
10739 | -- Derived_Type, unless this is a rederivation in the private part | |
10740 | -- of an operation that was already derived in the visible part of | |
10741 | -- the current package. | |
10742 | ||
0791fbe9 | 10743 | if Ada_Version >= Ada_2005 |
947430d5 AC |
10744 | and then Present (Derived_Type) |
10745 | and then Present (Alias (S)) | |
10746 | and then Is_Dispatching_Operation (Alias (S)) | |
10747 | and then Present (Find_Dispatching_Type (Alias (S))) | |
10748 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
10749 | then | |
10750 | -- For private types, when the full-view is processed we propagate to | |
10751 | -- the full view the non-overridden entities whose attribute "alias" | |
10752 | -- references an interface primitive. These entities were added by | |
10753 | -- Derive_Subprograms to ensure that interface primitives are | |
10754 | -- covered. | |
10755 | ||
10756 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
10757 | -- internal entity that links an interface primitive with its | |
10758 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 10759 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
10760 | |
10761 | if Inside_Freezing_Actions = 0 | |
10762 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
10763 | and then In_Private_Part (Current_Scope) | |
10764 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
10765 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
10766 | and then Full_View (Defining_Identifier (Parent (E))) | |
10767 | = Defining_Identifier (Parent (S)) | |
10768 | and then Alias (E) = Alias (S) | |
10769 | then | |
10770 | Check_Operation_From_Private_View (S, E); | |
10771 | Set_Is_Dispatching_Operation (S); | |
10772 | ||
10773 | -- Common case | |
10774 | ||
10775 | else | |
10776 | Enter_Overloaded_Entity (S); | |
10777 | Check_Dispatching_Operation (S, Empty); | |
10778 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
10779 | end if; | |
10780 | ||
10781 | return; | |
10782 | end if; | |
10783 | ||
ca90b962 GD |
10784 | -- For synchronized types check conflicts of this entity with previously |
10785 | -- defined entities. | |
42f11e4c AC |
10786 | |
10787 | if Ada_Version >= Ada_2005 | |
10788 | and then Has_Matching_Entry_Or_Subprogram (S) | |
10789 | then | |
10790 | return; | |
10791 | end if; | |
10792 | ||
fbf5a39b AC |
10793 | -- If there is no homonym then this is definitely not overriding |
10794 | ||
996ae0b0 RK |
10795 | if No (E) then |
10796 | Enter_Overloaded_Entity (S); | |
10797 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 10798 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 10799 | |
2995860f AC |
10800 | -- If subprogram has an explicit declaration, check whether it has an |
10801 | -- overriding indicator. | |
758c442c | 10802 | |
ec4867fa | 10803 | if Comes_From_Source (S) then |
8aa15e3b | 10804 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
10805 | |
10806 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
10807 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 10808 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
10809 | -- overriding indicator. |
10810 | ||
10811 | if Ada_Version >= Ada_2012 | |
10812 | and then No (Overridden_Subp) | |
10813 | and then Is_Dispatching_Operation (S) | |
038140ed | 10814 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
10815 | then |
10816 | Overridden_Subp := Overridden_Operation (S); | |
10817 | end if; | |
10818 | ||
5d37ba92 ES |
10819 | Check_Overriding_Indicator |
10820 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
241ebe89 HK |
10821 | |
10822 | -- The Ghost policy in effect at the point of declaration of a | |
10823 | -- parent subprogram and an overriding subprogram must match | |
10824 | -- (SPARK RM 6.9(17)). | |
10825 | ||
10826 | Check_Ghost_Overriding (S, Overridden_Subp); | |
758c442c GD |
10827 | end if; |
10828 | ||
fbf5a39b AC |
10829 | -- If there is a homonym that is not overloadable, then we have an |
10830 | -- error, except for the special cases checked explicitly below. | |
10831 | ||
996ae0b0 RK |
10832 | elsif not Is_Overloadable (E) then |
10833 | ||
10834 | -- Check for spurious conflict produced by a subprogram that has the | |
10835 | -- same name as that of the enclosing generic package. The conflict | |
10836 | -- occurs within an instance, between the subprogram and the renaming | |
10837 | -- declaration for the package. After the subprogram, the package | |
10838 | -- renaming declaration becomes hidden. | |
10839 | ||
10840 | if Ekind (E) = E_Package | |
10841 | and then Present (Renamed_Object (E)) | |
10842 | and then Renamed_Object (E) = Current_Scope | |
10843 | and then Nkind (Parent (Renamed_Object (E))) = | |
10844 | N_Package_Specification | |
10845 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
10846 | then | |
10847 | Set_Is_Hidden (E); | |
10848 | Set_Is_Immediately_Visible (E, False); | |
10849 | Enter_Overloaded_Entity (S); | |
10850 | Set_Homonym (S, Homonym (E)); | |
10851 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 10852 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
10853 | |
10854 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
10855 | -- declaration. However if it is dispatching, it must appear in the |
10856 | -- dispatch table anyway, because it can be dispatched to even if it | |
10857 | -- cannot be called directly. | |
996ae0b0 | 10858 | |
4adf3c50 | 10859 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
10860 | Set_Scope (S, Current_Scope); |
10861 | ||
10862 | if Is_Dispatching_Operation (Alias (S)) then | |
10863 | Check_Dispatching_Operation (S, Empty); | |
10864 | end if; | |
10865 | ||
10866 | return; | |
10867 | ||
10868 | else | |
42f11e4c | 10869 | Report_Conflict (S, E); |
996ae0b0 RK |
10870 | return; |
10871 | end if; | |
10872 | ||
fbf5a39b AC |
10873 | -- E exists and is overloadable |
10874 | ||
996ae0b0 | 10875 | else |
8aa15e3b | 10876 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 10877 | |
82c80734 RD |
10878 | -- Loop through E and its homonyms to determine if any of them is |
10879 | -- the candidate for overriding by S. | |
996ae0b0 RK |
10880 | |
10881 | while Present (E) loop | |
fbf5a39b AC |
10882 | |
10883 | -- Definitely not interesting if not in the current scope | |
10884 | ||
996ae0b0 RK |
10885 | if Scope (E) /= Current_Scope then |
10886 | null; | |
10887 | ||
aca90db9 AC |
10888 | -- A function can overload the name of an abstract state. The |
10889 | -- state can be viewed as a function with a profile that cannot | |
10890 | -- be matched by anything. | |
10891 | ||
10892 | elsif Ekind (S) = E_Function | |
10893 | and then Ekind (E) = E_Abstract_State | |
10894 | then | |
10895 | Enter_Overloaded_Entity (S); | |
10896 | return; | |
10897 | ||
2995860f AC |
10898 | -- Ada 2012 (AI05-0165): For internally generated bodies of null |
10899 | -- procedures locate the internally generated spec. We enforce | |
10900 | -- mode conformance since a tagged type may inherit from | |
10901 | -- interfaces several null primitives which differ only in | |
10902 | -- the mode of the formals. | |
25ebc085 AC |
10903 | |
10904 | elsif not Comes_From_Source (S) | |
10905 | and then Is_Null_Procedure (S) | |
10906 | and then not Mode_Conformant (E, S) | |
10907 | then | |
10908 | null; | |
10909 | ||
fbf5a39b AC |
10910 | -- Check if we have type conformance |
10911 | ||
ec4867fa | 10912 | elsif Type_Conformant (E, S) then |
c8ef728f | 10913 | |
82c80734 RD |
10914 | -- If the old and new entities have the same profile and one |
10915 | -- is not the body of the other, then this is an error, unless | |
10916 | -- one of them is implicitly declared. | |
996ae0b0 RK |
10917 | |
10918 | -- There are some cases when both can be implicit, for example | |
10919 | -- when both a literal and a function that overrides it are | |
f3d57416 | 10920 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 10921 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 10922 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 10923 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
10924 | -- the former, and the literal is always the former. In the |
10925 | -- odd case where both are derived operations declared at the | |
10926 | -- same point, both operations should be declared, and in that | |
10927 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
10928 | -- part. This can only occur for certain obscure cases in |
10929 | -- instances, when an operation on a type derived from a formal | |
10930 | -- private type does not override a homograph inherited from | |
10931 | -- the actual. In subsequent derivations of such a type, the | |
10932 | -- DT positions of these operations remain distinct, if they | |
10933 | -- have been set. | |
996ae0b0 RK |
10934 | |
10935 | if Present (Alias (S)) | |
10936 | and then (No (Alias (E)) | |
10937 | or else Comes_From_Source (E) | |
2ddc2000 | 10938 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
10939 | or else |
10940 | (Is_Dispatching_Operation (E) | |
84c0a895 | 10941 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 10942 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 10943 | then |
82c80734 RD |
10944 | -- When an derived operation is overloaded it may be due to |
10945 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
10946 | -- re-inherits. It has to be dealt with. |
10947 | ||
e660dbf7 | 10948 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
10949 | and then In_Private_Part (Current_Scope) |
10950 | then | |
10951 | Check_Operation_From_Private_View (S, E); | |
10952 | end if; | |
10953 | ||
038140ed AC |
10954 | -- In any case the implicit operation remains hidden by the |
10955 | -- existing declaration, which is overriding. Indicate that | |
10956 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 10957 | |
038140ed | 10958 | if Present (Alias (S)) then |
039538bc AC |
10959 | Set_Overridden_Operation (E, Alias (S)); |
10960 | Inherit_Subprogram_Contract (E, Alias (S)); | |
10961 | ||
038140ed | 10962 | else |
039538bc AC |
10963 | Set_Overridden_Operation (E, S); |
10964 | Inherit_Subprogram_Contract (E, S); | |
038140ed | 10965 | end if; |
758c442c GD |
10966 | |
10967 | if Comes_From_Source (E) then | |
5d37ba92 | 10968 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
241ebe89 HK |
10969 | |
10970 | -- The Ghost policy in effect at the point of declaration | |
10971 | -- of a parent subprogram and an overriding subprogram | |
10972 | -- must match (SPARK RM 6.9(17)). | |
10973 | ||
10974 | Check_Ghost_Overriding (E, S); | |
758c442c GD |
10975 | end if; |
10976 | ||
996ae0b0 RK |
10977 | return; |
10978 | ||
26a43556 AC |
10979 | -- Within an instance, the renaming declarations for actual |
10980 | -- subprograms may become ambiguous, but they do not hide each | |
10981 | -- other. | |
996ae0b0 RK |
10982 | |
10983 | elsif Ekind (E) /= E_Entry | |
10984 | and then not Comes_From_Source (E) | |
10985 | and then not Is_Generic_Instance (E) | |
10986 | and then (Present (Alias (E)) | |
10987 | or else Is_Intrinsic_Subprogram (E)) | |
10988 | and then (not In_Instance | |
10989 | or else No (Parent (E)) | |
10990 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 10991 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 10992 | then |
26a43556 AC |
10993 | -- A subprogram child unit is not allowed to override an |
10994 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
10995 | |
10996 | if Is_Child_Unit (S) then | |
10997 | Error_Msg_N | |
10998 | ("child unit overrides inherited subprogram in parent", | |
10999 | S); | |
11000 | return; | |
11001 | end if; | |
11002 | ||
11003 | if Is_Non_Overriding_Operation (E, S) then | |
11004 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 11005 | |
c8ef728f | 11006 | if No (Derived_Type) |
996ae0b0 RK |
11007 | or else Is_Tagged_Type (Derived_Type) |
11008 | then | |
11009 | Check_Dispatching_Operation (S, Empty); | |
11010 | end if; | |
11011 | ||
11012 | return; | |
11013 | end if; | |
11014 | ||
11015 | -- E is a derived operation or an internal operator which | |
11016 | -- is being overridden. Remove E from further visibility. | |
11017 | -- Furthermore, if E is a dispatching operation, it must be | |
11018 | -- replaced in the list of primitive operations of its type | |
11019 | -- (see Override_Dispatching_Operation). | |
11020 | ||
ec4867fa | 11021 | Overridden_Subp := E; |
758c442c | 11022 | |
996ae0b0 RK |
11023 | declare |
11024 | Prev : Entity_Id; | |
11025 | ||
11026 | begin | |
11027 | Prev := First_Entity (Current_Scope); | |
8fde064e | 11028 | while Present (Prev) and then Next_Entity (Prev) /= E loop |
996ae0b0 RK |
11029 | Next_Entity (Prev); |
11030 | end loop; | |
11031 | ||
11032 | -- It is possible for E to be in the current scope and | |
11033 | -- yet not in the entity chain. This can only occur in a | |
11034 | -- generic context where E is an implicit concatenation | |
11035 | -- in the formal part, because in a generic body the | |
11036 | -- entity chain starts with the formals. | |
11037 | ||
948ed277 AC |
11038 | -- In GNATprove mode, a wrapper for an operation with |
11039 | -- axiomatization may be a homonym of another declaration | |
11040 | -- for an actual subprogram (needs refinement ???). | |
11041 | ||
11042 | if No (Prev) then | |
11043 | if In_Instance | |
11044 | and then GNATprove_Mode | |
11045 | and then | |
11046 | Nkind (Original_Node (Unit_Declaration_Node (S))) = | |
11047 | N_Subprogram_Renaming_Declaration | |
11048 | then | |
11049 | return; | |
11050 | else | |
11051 | pragma Assert (Chars (E) = Name_Op_Concat); | |
11052 | null; | |
11053 | end if; | |
11054 | end if; | |
996ae0b0 RK |
11055 | |
11056 | -- E must be removed both from the entity_list of the | |
948ed277 | 11057 | -- current scope, and from the visibility chain. |
996ae0b0 RK |
11058 | |
11059 | if Debug_Flag_E then | |
11060 | Write_Str ("Override implicit operation "); | |
11061 | Write_Int (Int (E)); | |
11062 | Write_Eol; | |
11063 | end if; | |
11064 | ||
11065 | -- If E is a predefined concatenation, it stands for four | |
11066 | -- different operations. As a result, a single explicit | |
11067 | -- declaration does not hide it. In a possible ambiguous | |
11068 | -- situation, Disambiguate chooses the user-defined op, | |
11069 | -- so it is correct to retain the previous internal one. | |
11070 | ||
11071 | if Chars (E) /= Name_Op_Concat | |
11072 | or else Ekind (E) /= E_Operator | |
11073 | then | |
11074 | -- For nondispatching derived operations that are | |
11075 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
11076 | -- part of a package, we retain the derived subprogram |
11077 | -- but mark it as not immediately visible. If the | |
11078 | -- derived operation was declared in the visible part | |
11079 | -- then this ensures that it will still be visible | |
11080 | -- outside the package with the proper signature | |
11081 | -- (calls from outside must also be directed to this | |
11082 | -- version rather than the overriding one, unlike the | |
11083 | -- dispatching case). Calls from inside the package | |
11084 | -- will still resolve to the overriding subprogram | |
11085 | -- since the derived one is marked as not visible | |
11086 | -- within the package. | |
996ae0b0 RK |
11087 | |
11088 | -- If the private operation is dispatching, we achieve | |
11089 | -- the overriding by keeping the implicit operation | |
9865d858 | 11090 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
11091 | -- this fashion the proper body is executed in all |
11092 | -- cases, but the original signature is used outside | |
11093 | -- of the package. | |
11094 | ||
11095 | -- If the overriding is not in the private part, we | |
11096 | -- remove the implicit operation altogether. | |
11097 | ||
11098 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
11099 | if not Is_Dispatching_Operation (E) then |
11100 | Set_Is_Immediately_Visible (E, False); | |
11101 | else | |
e895b435 | 11102 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 11103 | -- so nothing else needs to be done here. |
996ae0b0 RK |
11104 | |
11105 | null; | |
11106 | end if; | |
996ae0b0 | 11107 | |
fbf5a39b AC |
11108 | else |
11109 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
11110 | |
11111 | if E = Current_Entity (E) then | |
11112 | Prev_Vis := Empty; | |
11113 | else | |
11114 | Prev_Vis := Current_Entity (E); | |
11115 | while Homonym (Prev_Vis) /= E loop | |
11116 | Prev_Vis := Homonym (Prev_Vis); | |
11117 | end loop; | |
11118 | end if; | |
11119 | ||
11120 | if Prev_Vis /= Empty then | |
11121 | ||
11122 | -- Skip E in the visibility chain | |
11123 | ||
11124 | Set_Homonym (Prev_Vis, Homonym (E)); | |
11125 | ||
11126 | else | |
11127 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
11128 | end if; | |
11129 | ||
11130 | Set_Next_Entity (Prev, Next_Entity (E)); | |
11131 | ||
11132 | if No (Next_Entity (Prev)) then | |
11133 | Set_Last_Entity (Current_Scope, Prev); | |
11134 | end if; | |
996ae0b0 RK |
11135 | end if; |
11136 | end if; | |
11137 | ||
11138 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
11139 | |
11140 | -- For entities generated by Derive_Subprograms the | |
11141 | -- overridden operation is the inherited primitive | |
11142 | -- (which is available through the attribute alias). | |
11143 | ||
11144 | if not (Comes_From_Source (E)) | |
11145 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
11146 | and then Find_Dispatching_Type (E) = |
11147 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
11148 | and then Present (Alias (E)) |
11149 | and then Comes_From_Source (Alias (E)) | |
11150 | then | |
039538bc AC |
11151 | Set_Overridden_Operation (S, Alias (E)); |
11152 | Inherit_Subprogram_Contract (S, Alias (E)); | |
2fe829ae | 11153 | |
6320f5e1 AC |
11154 | -- Normal case of setting entity as overridden |
11155 | ||
11156 | -- Note: Static_Initialization and Overridden_Operation | |
11157 | -- attributes use the same field in subprogram entities. | |
11158 | -- Static_Initialization is only defined for internal | |
11159 | -- initialization procedures, where Overridden_Operation | |
11160 | -- is irrelevant. Therefore the setting of this attribute | |
11161 | -- must check whether the target is an init_proc. | |
11162 | ||
2fe829ae | 11163 | elsif not Is_Init_Proc (S) then |
039538bc AC |
11164 | Set_Overridden_Operation (S, E); |
11165 | Inherit_Subprogram_Contract (S, E); | |
1c1289e7 AC |
11166 | end if; |
11167 | ||
5d37ba92 | 11168 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 11169 | |
241ebe89 HK |
11170 | -- The Ghost policy in effect at the point of declaration |
11171 | -- of a parent subprogram and an overriding subprogram | |
11172 | -- must match (SPARK RM 6.9(17)). | |
11173 | ||
11174 | Check_Ghost_Overriding (S, E); | |
11175 | ||
fc53fe76 | 11176 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
11177 | -- expanded to override an inherited null procedure, or a |
11178 | -- predefined dispatching primitive then indicate that E | |
038140ed | 11179 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
11180 | |
11181 | if Comes_From_Source (S) | |
11182 | or else | |
11183 | (Present (Parent (S)) | |
11184 | and then | |
11185 | Nkind (Parent (S)) = N_Procedure_Specification | |
11186 | and then | |
11187 | Null_Present (Parent (S))) | |
38ef8ebe AC |
11188 | or else |
11189 | (Present (Alias (E)) | |
f16e8df9 RD |
11190 | and then |
11191 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 11192 | then |
c8ef728f | 11193 | if Present (Alias (E)) then |
039538bc AC |
11194 | Set_Overridden_Operation (S, Alias (E)); |
11195 | Inherit_Subprogram_Contract (S, Alias (E)); | |
41251c60 JM |
11196 | end if; |
11197 | end if; | |
11198 | ||
996ae0b0 | 11199 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 11200 | |
82c80734 | 11201 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 11202 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
11203 | |
11204 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
11205 | Check_Dispatching_Operation (S, E); |
11206 | ||
996ae0b0 RK |
11207 | else |
11208 | Check_Dispatching_Operation (S, Empty); | |
11209 | end if; | |
11210 | ||
5d37ba92 ES |
11211 | Check_For_Primitive_Subprogram |
11212 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
11213 | goto Check_Inequality; |
11214 | end; | |
11215 | ||
11216 | -- Apparent redeclarations in instances can occur when two | |
11217 | -- formal types get the same actual type. The subprograms in | |
11218 | -- in the instance are legal, even if not callable from the | |
11219 | -- outside. Calls from within are disambiguated elsewhere. | |
11220 | -- For dispatching operations in the visible part, the usual | |
11221 | -- rules apply, and operations with the same profile are not | |
11222 | -- legal (B830001). | |
11223 | ||
11224 | elsif (In_Instance_Visible_Part | |
11225 | and then not Is_Dispatching_Operation (E)) | |
11226 | or else In_Instance_Not_Visible | |
11227 | then | |
11228 | null; | |
11229 | ||
11230 | -- Here we have a real error (identical profile) | |
11231 | ||
11232 | else | |
11233 | Error_Msg_Sloc := Sloc (E); | |
11234 | ||
11235 | -- Avoid cascaded errors if the entity appears in | |
11236 | -- subsequent calls. | |
11237 | ||
11238 | Set_Scope (S, Current_Scope); | |
11239 | ||
5d37ba92 ES |
11240 | -- Generate error, with extra useful warning for the case |
11241 | -- of a generic instance with no completion. | |
996ae0b0 RK |
11242 | |
11243 | if Is_Generic_Instance (S) | |
11244 | and then not Has_Completion (E) | |
11245 | then | |
11246 | Error_Msg_N | |
5d37ba92 ES |
11247 | ("instantiation cannot provide body for&", S); |
11248 | Error_Msg_N ("\& conflicts with declaration#", S); | |
11249 | else | |
11250 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
11251 | end if; |
11252 | ||
11253 | return; | |
11254 | end if; | |
11255 | ||
11256 | else | |
c8ef728f ES |
11257 | -- If one subprogram has an access parameter and the other |
11258 | -- a parameter of an access type, calls to either might be | |
11259 | -- ambiguous. Verify that parameters match except for the | |
11260 | -- access parameter. | |
11261 | ||
11262 | if May_Hide_Profile then | |
11263 | declare | |
ec4867fa ES |
11264 | F1 : Entity_Id; |
11265 | F2 : Entity_Id; | |
8dbd1460 | 11266 | |
c8ef728f ES |
11267 | begin |
11268 | F1 := First_Formal (S); | |
11269 | F2 := First_Formal (E); | |
11270 | while Present (F1) and then Present (F2) loop | |
11271 | if Is_Access_Type (Etype (F1)) then | |
11272 | if not Is_Access_Type (Etype (F2)) | |
11273 | or else not Conforming_Types | |
11274 | (Designated_Type (Etype (F1)), | |
11275 | Designated_Type (Etype (F2)), | |
11276 | Type_Conformant) | |
11277 | then | |
11278 | May_Hide_Profile := False; | |
11279 | end if; | |
11280 | ||
11281 | elsif | |
11282 | not Conforming_Types | |
11283 | (Etype (F1), Etype (F2), Type_Conformant) | |
11284 | then | |
11285 | May_Hide_Profile := False; | |
11286 | end if; | |
11287 | ||
11288 | Next_Formal (F1); | |
11289 | Next_Formal (F2); | |
11290 | end loop; | |
11291 | ||
11292 | if May_Hide_Profile | |
11293 | and then No (F1) | |
11294 | and then No (F2) | |
11295 | then | |
dbfeb4fa | 11296 | Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
c8ef728f ES |
11297 | end if; |
11298 | end; | |
11299 | end if; | |
996ae0b0 RK |
11300 | end if; |
11301 | ||
996ae0b0 RK |
11302 | E := Homonym (E); |
11303 | end loop; | |
11304 | ||
11305 | -- On exit, we know that S is a new entity | |
11306 | ||
11307 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
11308 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
11309 | Check_Overriding_Indicator | |
11310 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 11311 | |
241ebe89 HK |
11312 | -- The Ghost policy in effect at the point of declaration of a parent |
11313 | -- subprogram and an overriding subprogram must match | |
11314 | -- (SPARK RM 6.9(17)). | |
11315 | ||
11316 | Check_Ghost_Overriding (S, Overridden_Subp); | |
11317 | ||
c4d67e2d | 11318 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 11319 | |
c4d67e2d AC |
11320 | if Nkind (S) /= N_Defining_Operator_Symbol then |
11321 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
ce5ba43a | 11322 | Check_SPARK_05_Restriction |
c4d67e2d AC |
11323 | ("overloading not allowed with entity#", S); |
11324 | end if; | |
8ed68165 | 11325 | |
82c80734 RD |
11326 | -- If S is a derived operation for an untagged type then by |
11327 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
11328 | -- operation was dispatching), so Check_Dispatching_Operation is not |
11329 | -- called in that case. | |
996ae0b0 | 11330 | |
c8ef728f | 11331 | if No (Derived_Type) |
996ae0b0 RK |
11332 | or else Is_Tagged_Type (Derived_Type) |
11333 | then | |
11334 | Check_Dispatching_Operation (S, Empty); | |
11335 | end if; | |
11336 | end if; | |
11337 | ||
82c80734 RD |
11338 | -- If this is a user-defined equality operator that is not a derived |
11339 | -- subprogram, create the corresponding inequality. If the operation is | |
11340 | -- dispatching, the expansion is done elsewhere, and we do not create | |
11341 | -- an explicit inequality operation. | |
996ae0b0 RK |
11342 | |
11343 | <<Check_Inequality>> | |
11344 | if Chars (S) = Name_Op_Eq | |
11345 | and then Etype (S) = Standard_Boolean | |
11346 | and then Present (Parent (S)) | |
11347 | and then not Is_Dispatching_Operation (S) | |
11348 | then | |
11349 | Make_Inequality_Operator (S); | |
b2834fbd | 11350 | Check_Untagged_Equality (S); |
996ae0b0 | 11351 | end if; |
996ae0b0 RK |
11352 | end New_Overloaded_Entity; |
11353 | ||
11354 | --------------------- | |
11355 | -- Process_Formals -- | |
11356 | --------------------- | |
11357 | ||
11358 | procedure Process_Formals | |
07fc65c4 | 11359 | (T : List_Id; |
996ae0b0 RK |
11360 | Related_Nod : Node_Id) |
11361 | is | |
7b56a91b | 11362 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
950d217a AC |
11363 | -- Determine whether an access type designates a type coming from a |
11364 | -- limited view. | |
11365 | ||
07fc65c4 | 11366 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
11367 | -- Check whether the default has a class-wide type. After analysis the |
11368 | -- default has the type of the formal, so we must also check explicitly | |
11369 | -- for an access attribute. | |
07fc65c4 | 11370 | |
7b56a91b AC |
11371 | ---------------------------------- |
11372 | -- Designates_From_Limited_With -- | |
11373 | ---------------------------------- | |
950d217a | 11374 | |
7b56a91b | 11375 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
950d217a AC |
11376 | Desig : Entity_Id := Typ; |
11377 | ||
11378 | begin | |
11379 | if Is_Access_Type (Desig) then | |
11380 | Desig := Directly_Designated_Type (Desig); | |
11381 | end if; | |
11382 | ||
11383 | if Is_Class_Wide_Type (Desig) then | |
11384 | Desig := Root_Type (Desig); | |
11385 | end if; | |
11386 | ||
11387 | return | |
7b56a91b AC |
11388 | Ekind (Desig) = E_Incomplete_Type |
11389 | and then From_Limited_With (Desig); | |
11390 | end Designates_From_Limited_With; | |
950d217a | 11391 | |
07fc65c4 GB |
11392 | --------------------------- |
11393 | -- Is_Class_Wide_Default -- | |
11394 | --------------------------- | |
11395 | ||
11396 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
11397 | begin | |
11398 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
1b1d88b1 | 11399 | or else (Nkind (D) = N_Attribute_Reference |
0f853035 YM |
11400 | and then Attribute_Name (D) = Name_Access |
11401 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
11402 | end Is_Class_Wide_Default; |
11403 | ||
847d950d HK |
11404 | -- Local variables |
11405 | ||
11406 | Context : constant Node_Id := Parent (Parent (T)); | |
11407 | Default : Node_Id; | |
11408 | Formal : Entity_Id; | |
11409 | Formal_Type : Entity_Id; | |
11410 | Param_Spec : Node_Id; | |
11411 | Ptype : Entity_Id; | |
11412 | ||
11413 | Num_Out_Params : Nat := 0; | |
11414 | First_Out_Param : Entity_Id := Empty; | |
11415 | -- Used for setting Is_Only_Out_Parameter | |
11416 | ||
07fc65c4 GB |
11417 | -- Start of processing for Process_Formals |
11418 | ||
996ae0b0 RK |
11419 | begin |
11420 | -- In order to prevent premature use of the formals in the same formal | |
11421 | -- part, the Ekind is left undefined until all default expressions are | |
11422 | -- analyzed. The Ekind is established in a separate loop at the end. | |
11423 | ||
11424 | Param_Spec := First (T); | |
996ae0b0 | 11425 | while Present (Param_Spec) loop |
996ae0b0 | 11426 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 11427 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
11428 | Enter_Name (Formal); |
11429 | ||
11430 | -- Case of ordinary parameters | |
11431 | ||
11432 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
11433 | Find_Type (Parameter_Type (Param_Spec)); | |
11434 | Ptype := Parameter_Type (Param_Spec); | |
11435 | ||
11436 | if Ptype = Error then | |
11437 | goto Continue; | |
11438 | end if; | |
11439 | ||
11440 | Formal_Type := Entity (Ptype); | |
11441 | ||
ec4867fa ES |
11442 | if Is_Incomplete_Type (Formal_Type) |
11443 | or else | |
11444 | (Is_Class_Wide_Type (Formal_Type) | |
8fde064e | 11445 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
996ae0b0 | 11446 | then |
93bcda23 AC |
11447 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
11448 | -- primitive operations, as long as their completion is | |
11449 | -- in the same declarative part. If in the private part | |
11450 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
11451 | -- Check is done on package exit. For access to subprograms, |
11452 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 11453 | |
6eddd7b4 AC |
11454 | -- Ada 2012: tagged incomplete types are allowed as generic |
11455 | -- formal types. They do not introduce dependencies and the | |
11456 | -- corresponding generic subprogram does not have a delayed | |
5b6f12c7 AC |
11457 | -- freeze, because it does not need a freeze node. However, |
11458 | -- it is still the case that untagged incomplete types cannot | |
11459 | -- be Taft-amendment types and must be completed in private | |
11460 | -- part, so the subprogram must appear in the list of private | |
1e55d29a | 11461 | -- dependents of the type. |
5b6f12c7 AC |
11462 | |
11463 | if Is_Tagged_Type (Formal_Type) | |
b973629e | 11464 | or else (Ada_Version >= Ada_2012 |
1ebc2612 AC |
11465 | and then not From_Limited_With (Formal_Type) |
11466 | and then not Is_Generic_Type (Formal_Type)) | |
5b6f12c7 | 11467 | then |
93bcda23 | 11468 | if Ekind (Scope (Current_Scope)) = E_Package |
6eddd7b4 | 11469 | and then not Is_Generic_Type (Formal_Type) |
1e55d29a | 11470 | and then not Is_Class_Wide_Type (Formal_Type) |
93bcda23 | 11471 | then |
cec29135 | 11472 | if not Nkind_In |
f26a3587 AC |
11473 | (Parent (T), N_Access_Function_Definition, |
11474 | N_Access_Procedure_Definition) | |
cec29135 | 11475 | then |
1e55d29a EB |
11476 | Append_Elmt (Current_Scope, |
11477 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
11478 | |
11479 | -- Freezing is delayed to ensure that Register_Prim | |
11480 | -- will get called for this operation, which is needed | |
11481 | -- in cases where static dispatch tables aren't built. | |
11482 | -- (Note that the same is done for controlling access | |
11483 | -- parameter cases in function Access_Definition.) | |
11484 | ||
13fa2acb AC |
11485 | if not Is_Thunk (Current_Scope) then |
11486 | Set_Has_Delayed_Freeze (Current_Scope); | |
11487 | end if; | |
cec29135 | 11488 | end if; |
93bcda23 | 11489 | end if; |
fbf5a39b | 11490 | |
800621e0 RD |
11491 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
11492 | N_Access_Procedure_Definition) | |
996ae0b0 | 11493 | then |
dd386db0 AC |
11494 | -- AI05-0151: Tagged incomplete types are allowed in all |
11495 | -- formal parts. Untagged incomplete types are not allowed | |
b973629e AC |
11496 | -- in bodies. Limited views of either kind are not allowed |
11497 | -- if there is no place at which the non-limited view can | |
11498 | -- become available. | |
a18e3d62 | 11499 | |
1ebc2612 AC |
11500 | -- Incomplete formal untagged types are not allowed in |
11501 | -- subprogram bodies (but are legal in their declarations). | |
c8d3b4ff AC |
11502 | -- This excludes bodies created for null procedures, which |
11503 | -- are basic declarations. | |
1ebc2612 AC |
11504 | |
11505 | if Is_Generic_Type (Formal_Type) | |
11506 | and then not Is_Tagged_Type (Formal_Type) | |
11507 | and then Nkind (Parent (Related_Nod)) = N_Subprogram_Body | |
11508 | then | |
11509 | Error_Msg_N | |
11510 | ("invalid use of formal incomplete type", Param_Spec); | |
dd386db0 | 11511 | |
1ebc2612 | 11512 | elsif Ada_Version >= Ada_2012 then |
b973629e AC |
11513 | if Is_Tagged_Type (Formal_Type) |
11514 | and then (not From_Limited_With (Formal_Type) | |
11515 | or else not In_Package_Body) | |
11516 | then | |
dd386db0 AC |
11517 | null; |
11518 | ||
c8d3b4ff AC |
11519 | elsif Nkind_In (Context, N_Accept_Statement, |
11520 | N_Accept_Alternative, | |
11521 | N_Entry_Body) | |
11522 | or else (Nkind (Context) = N_Subprogram_Body | |
11523 | and then Comes_From_Source (Context)) | |
dd386db0 AC |
11524 | then |
11525 | Error_Msg_NE | |
c8d3b4ff | 11526 | ("invalid use of untagged incomplete type &", |
0f1a6a0b | 11527 | Ptype, Formal_Type); |
dd386db0 AC |
11528 | end if; |
11529 | ||
11530 | else | |
11531 | Error_Msg_NE | |
11532 | ("invalid use of incomplete type&", | |
0f1a6a0b | 11533 | Param_Spec, Formal_Type); |
dd386db0 AC |
11534 | |
11535 | -- Further checks on the legality of incomplete types | |
11536 | -- in formal parts are delayed until the freeze point | |
11537 | -- of the enclosing subprogram or access to subprogram. | |
11538 | end if; | |
996ae0b0 RK |
11539 | end if; |
11540 | ||
11541 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
11542 | Error_Msg_NE |
11543 | ("premature use of&", | |
11544 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
11545 | end if; |
11546 | ||
fecbd779 AC |
11547 | -- Ada 2012 (AI-142): Handle aliased parameters |
11548 | ||
11549 | if Ada_Version >= Ada_2012 | |
11550 | and then Aliased_Present (Param_Spec) | |
11551 | then | |
11552 | Set_Is_Aliased (Formal); | |
11553 | end if; | |
11554 | ||
0ab80019 | 11555 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 11556 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
11557 | -- formal in the enclosing scope. Finally, replace the parameter |
11558 | -- type of the formal with the internal subtype. | |
7324bf49 | 11559 | |
0791fbe9 | 11560 | if Ada_Version >= Ada_2005 |
41251c60 | 11561 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 11562 | then |
ec4867fa | 11563 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 11564 | Error_Msg_N |
0a36105d JM |
11565 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
11566 | ||
ec4867fa ES |
11567 | else |
11568 | if Can_Never_Be_Null (Formal_Type) | |
11569 | and then Comes_From_Source (Related_Nod) | |
11570 | then | |
ed2233dc | 11571 | Error_Msg_NE |
0a36105d | 11572 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 11573 | Param_Spec, Formal_Type); |
ec4867fa | 11574 | end if; |
41251c60 | 11575 | |
ec4867fa ES |
11576 | Formal_Type := |
11577 | Create_Null_Excluding_Itype | |
11578 | (T => Formal_Type, | |
11579 | Related_Nod => Related_Nod, | |
11580 | Scope_Id => Scope (Current_Scope)); | |
0a36105d | 11581 | |
fcf848c4 AC |
11582 | -- If the designated type of the itype is an itype that is |
11583 | -- not frozen yet, we set the Has_Delayed_Freeze attribute | |
11584 | -- on the access subtype, to prevent order-of-elaboration | |
11585 | -- issues in the backend. | |
0a36105d JM |
11586 | |
11587 | -- Example: | |
11588 | -- type T is access procedure; | |
11589 | -- procedure Op (O : not null T); | |
11590 | ||
fcf848c4 AC |
11591 | if Is_Itype (Directly_Designated_Type (Formal_Type)) |
11592 | and then | |
11593 | not Is_Frozen (Directly_Designated_Type (Formal_Type)) | |
11594 | then | |
0a36105d JM |
11595 | Set_Has_Delayed_Freeze (Formal_Type); |
11596 | end if; | |
ec4867fa | 11597 | end if; |
7324bf49 AC |
11598 | end if; |
11599 | ||
996ae0b0 RK |
11600 | -- An access formal type |
11601 | ||
11602 | else | |
11603 | Formal_Type := | |
11604 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 11605 | |
f937473f RD |
11606 | -- No need to continue if we already notified errors |
11607 | ||
11608 | if not Present (Formal_Type) then | |
11609 | return; | |
11610 | end if; | |
11611 | ||
0ab80019 | 11612 | -- Ada 2005 (AI-254) |
7324bf49 | 11613 | |
af4b9434 AC |
11614 | declare |
11615 | AD : constant Node_Id := | |
11616 | Access_To_Subprogram_Definition | |
11617 | (Parameter_Type (Param_Spec)); | |
11618 | begin | |
11619 | if Present (AD) and then Protected_Present (AD) then | |
11620 | Formal_Type := | |
11621 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 11622 | (Param_Spec); |
af4b9434 AC |
11623 | end if; |
11624 | end; | |
996ae0b0 RK |
11625 | end if; |
11626 | ||
11627 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 11628 | |
fecbd779 AC |
11629 | -- Deal with default expression if present |
11630 | ||
fbf5a39b | 11631 | Default := Expression (Param_Spec); |
996ae0b0 RK |
11632 | |
11633 | if Present (Default) then | |
ce5ba43a | 11634 | Check_SPARK_05_Restriction |
fe5d3068 | 11635 | ("default expression is not allowed", Default); |
38171f43 | 11636 | |
996ae0b0 | 11637 | if Out_Present (Param_Spec) then |
ed2233dc | 11638 | Error_Msg_N |
996ae0b0 RK |
11639 | ("default initialization only allowed for IN parameters", |
11640 | Param_Spec); | |
11641 | end if; | |
11642 | ||
11643 | -- Do the special preanalysis of the expression (see section on | |
11644 | -- "Handling of Default Expressions" in the spec of package Sem). | |
11645 | ||
21d27997 | 11646 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 11647 | |
f29b857f ES |
11648 | -- An access to constant cannot be the default for |
11649 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
11650 | |
11651 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
11652 | and then not Is_Access_Constant (Formal_Type) | |
11653 | and then Is_Access_Type (Etype (Default)) | |
11654 | and then Is_Access_Constant (Etype (Default)) | |
11655 | then | |
f29b857f | 11656 | Error_Msg_N |
84c0a895 AC |
11657 | ("formal that is access to variable cannot be initialized " |
11658 | & "with an access-to-constant expression", Default); | |
2eb160f2 ST |
11659 | end if; |
11660 | ||
d8db0bca JM |
11661 | -- Check that the designated type of an access parameter's default |
11662 | -- is not a class-wide type unless the parameter's designated type | |
11663 | -- is also class-wide. | |
996ae0b0 RK |
11664 | |
11665 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
7b56a91b | 11666 | and then not Designates_From_Limited_With (Formal_Type) |
07fc65c4 | 11667 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
11668 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
11669 | then | |
07fc65c4 GB |
11670 | Error_Msg_N |
11671 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 11672 | end if; |
4755cce9 JM |
11673 | |
11674 | -- Check incorrect use of dynamically tagged expressions | |
11675 | ||
11676 | if Is_Tagged_Type (Formal_Type) then | |
11677 | Check_Dynamically_Tagged_Expression | |
11678 | (Expr => Default, | |
11679 | Typ => Formal_Type, | |
11680 | Related_Nod => Default); | |
11681 | end if; | |
996ae0b0 RK |
11682 | end if; |
11683 | ||
41251c60 JM |
11684 | -- Ada 2005 (AI-231): Static checks |
11685 | ||
0791fbe9 | 11686 | if Ada_Version >= Ada_2005 |
41251c60 JM |
11687 | and then Is_Access_Type (Etype (Formal)) |
11688 | and then Can_Never_Be_Null (Etype (Formal)) | |
11689 | then | |
11690 | Null_Exclusion_Static_Checks (Param_Spec); | |
11691 | end if; | |
11692 | ||
847d950d HK |
11693 | -- The following checks are relevant only when SPARK_Mode is on as |
11694 | -- these are not standard Ada legality rules. | |
6c3c671e | 11695 | |
ea26c8e4 HK |
11696 | if SPARK_Mode = On then |
11697 | if Ekind_In (Scope (Formal), E_Function, E_Generic_Function) then | |
f1bd0415 | 11698 | |
ea26c8e4 HK |
11699 | -- A function cannot have a parameter of mode IN OUT or OUT |
11700 | -- (SPARK RM 6.1). | |
f1bd0415 | 11701 | |
ea26c8e4 HK |
11702 | if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then |
11703 | Error_Msg_N | |
11704 | ("function cannot have parameter of mode `OUT` or " | |
11705 | & "`IN OUT`", Formal); | |
ea26c8e4 HK |
11706 | end if; |
11707 | ||
d780e54f AC |
11708 | -- A procedure cannot have an effectively volatile formal |
11709 | -- parameter of mode IN because it behaves as a constant | |
db7e3721 | 11710 | -- (SPARK RM 7.1.3(6)). -- ??? maybe 7.1.3(4) |
ea26c8e4 HK |
11711 | |
11712 | elsif Ekind (Scope (Formal)) = E_Procedure | |
11713 | and then Ekind (Formal) = E_In_Parameter | |
d780e54f | 11714 | and then Is_Effectively_Volatile (Formal) |
ea26c8e4 | 11715 | then |
f1bd0415 | 11716 | Error_Msg_N |
ea26c8e4 | 11717 | ("formal parameter of mode `IN` cannot be volatile", Formal); |
f1bd0415 | 11718 | end if; |
6c3c671e AC |
11719 | end if; |
11720 | ||
996ae0b0 RK |
11721 | <<Continue>> |
11722 | Next (Param_Spec); | |
11723 | end loop; | |
11724 | ||
82c80734 RD |
11725 | -- If this is the formal part of a function specification, analyze the |
11726 | -- subtype mark in the context where the formals are visible but not | |
11727 | -- yet usable, and may hide outer homographs. | |
11728 | ||
11729 | if Nkind (Related_Nod) = N_Function_Specification then | |
11730 | Analyze_Return_Type (Related_Nod); | |
11731 | end if; | |
11732 | ||
996ae0b0 RK |
11733 | -- Now set the kind (mode) of each formal |
11734 | ||
11735 | Param_Spec := First (T); | |
996ae0b0 RK |
11736 | while Present (Param_Spec) loop |
11737 | Formal := Defining_Identifier (Param_Spec); | |
11738 | Set_Formal_Mode (Formal); | |
11739 | ||
11740 | if Ekind (Formal) = E_In_Parameter then | |
11741 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
11742 | ||
11743 | if Present (Expression (Param_Spec)) then | |
c8307596 | 11744 | Default := Expression (Param_Spec); |
996ae0b0 RK |
11745 | |
11746 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
11747 | if Nkind (Parameter_Type (Param_Spec)) /= |
11748 | N_Access_Definition | |
996ae0b0 RK |
11749 | then |
11750 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 11751 | else |
5ebfaacf AC |
11752 | Formal_Type := |
11753 | Access_Definition | |
11754 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
11755 | end if; |
11756 | ||
11757 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
11758 | end if; | |
2820d220 | 11759 | end if; |
800621e0 RD |
11760 | |
11761 | elsif Ekind (Formal) = E_Out_Parameter then | |
11762 | Num_Out_Params := Num_Out_Params + 1; | |
11763 | ||
11764 | if Num_Out_Params = 1 then | |
11765 | First_Out_Param := Formal; | |
11766 | end if; | |
11767 | ||
11768 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
11769 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
11770 | end if; |
11771 | ||
4172a8e3 AC |
11772 | -- Skip remaining processing if formal type was in error |
11773 | ||
11774 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
11775 | goto Next_Parameter; | |
11776 | end if; | |
11777 | ||
fecbd779 AC |
11778 | -- Force call by reference if aliased |
11779 | ||
1e60643a AC |
11780 | declare |
11781 | Conv : constant Convention_Id := Convention (Etype (Formal)); | |
11782 | begin | |
11783 | if Is_Aliased (Formal) then | |
11784 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf | 11785 | |
1e60643a | 11786 | -- Warn if user asked this to be passed by copy |
5ebfaacf | 11787 | |
1e60643a AC |
11788 | if Conv = Convention_Ada_Pass_By_Copy then |
11789 | Error_Msg_N | |
11790 | ("cannot pass aliased parameter & by copy??", Formal); | |
11791 | end if; | |
5ebfaacf | 11792 | |
1e60643a | 11793 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy |
5ebfaacf | 11794 | |
1e60643a AC |
11795 | elsif Conv = Convention_Ada_Pass_By_Copy then |
11796 | Set_Mechanism (Formal, By_Copy); | |
5ebfaacf | 11797 | |
1e60643a AC |
11798 | elsif Conv = Convention_Ada_Pass_By_Reference then |
11799 | Set_Mechanism (Formal, By_Reference); | |
11800 | end if; | |
11801 | end; | |
fecbd779 | 11802 | |
4172a8e3 | 11803 | <<Next_Parameter>> |
996ae0b0 RK |
11804 | Next (Param_Spec); |
11805 | end loop; | |
800621e0 RD |
11806 | |
11807 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
11808 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
11809 | end if; | |
996ae0b0 RK |
11810 | end Process_Formals; |
11811 | ||
fbf5a39b AC |
11812 | ---------------------------- |
11813 | -- Reference_Body_Formals -- | |
11814 | ---------------------------- | |
11815 | ||
11816 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
11817 | Fs : Entity_Id; | |
11818 | Fb : Entity_Id; | |
11819 | ||
11820 | begin | |
11821 | if Error_Posted (Spec) then | |
11822 | return; | |
11823 | end if; | |
11824 | ||
0a36105d JM |
11825 | -- Iterate over both lists. They may be of different lengths if the two |
11826 | -- specs are not conformant. | |
11827 | ||
fbf5a39b AC |
11828 | Fs := First_Formal (Spec); |
11829 | Fb := First_Formal (Bod); | |
0a36105d | 11830 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
11831 | Generate_Reference (Fs, Fb, 'b'); |
11832 | ||
11833 | if Style_Check then | |
11834 | Style.Check_Identifier (Fb, Fs); | |
11835 | end if; | |
11836 | ||
11837 | Set_Spec_Entity (Fb, Fs); | |
11838 | Set_Referenced (Fs, False); | |
11839 | Next_Formal (Fs); | |
11840 | Next_Formal (Fb); | |
11841 | end loop; | |
11842 | end Reference_Body_Formals; | |
11843 | ||
996ae0b0 RK |
11844 | ------------------------- |
11845 | -- Set_Actual_Subtypes -- | |
11846 | ------------------------- | |
11847 | ||
11848 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
84c0a895 AC |
11849 | Decl : Node_Id; |
11850 | Formal : Entity_Id; | |
11851 | T : Entity_Id; | |
11852 | First_Stmt : Node_Id := Empty; | |
11853 | AS_Needed : Boolean; | |
996ae0b0 RK |
11854 | |
11855 | begin | |
f3d57416 | 11856 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
11857 | -- actual subtypes (small optimization). |
11858 | ||
8fde064e | 11859 | if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
fbf5a39b | 11860 | return; |
0691ed6b AC |
11861 | |
11862 | -- Within a predicate function we do not want to generate local | |
11863 | -- subtypes that may generate nested predicate functions. | |
11864 | ||
11865 | elsif Is_Subprogram (Subp) and then Is_Predicate_Function (Subp) then | |
11866 | return; | |
fbf5a39b AC |
11867 | end if; |
11868 | ||
124bed29 AC |
11869 | -- The subtype declarations may freeze the formals. The body generated |
11870 | -- for an expression function is not a freeze point, so do not emit | |
11871 | -- these declarations (small loss of efficiency in rare cases). | |
11872 | ||
11873 | if Nkind (N) = N_Subprogram_Body | |
11874 | and then Was_Expression_Function (N) | |
11875 | then | |
11876 | return; | |
11877 | end if; | |
11878 | ||
996ae0b0 RK |
11879 | Formal := First_Formal (Subp); |
11880 | while Present (Formal) loop | |
11881 | T := Etype (Formal); | |
11882 | ||
e895b435 | 11883 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
11884 | |
11885 | if Is_Constrained (T) then | |
11886 | AS_Needed := False; | |
11887 | ||
82c80734 | 11888 | -- If we have unknown discriminants, then we do not need an actual |
a90bd866 | 11889 | -- subtype, or more accurately we cannot figure it out. Note that |
82c80734 | 11890 | -- all class-wide types have unknown discriminants. |
996ae0b0 RK |
11891 | |
11892 | elsif Has_Unknown_Discriminants (T) then | |
11893 | AS_Needed := False; | |
11894 | ||
82c80734 RD |
11895 | -- At this stage we have an unconstrained type that may need an |
11896 | -- actual subtype. For sure the actual subtype is needed if we have | |
405b907c AC |
11897 | -- an unconstrained array type. However, in an instance, the type |
11898 | -- may appear as a subtype of the full view, while the actual is | |
11899 | -- in fact private (in which case no actual subtype is needed) so | |
11900 | -- check the kind of the base type. | |
996ae0b0 | 11901 | |
405b907c | 11902 | elsif Is_Array_Type (Base_Type (T)) then |
996ae0b0 RK |
11903 | AS_Needed := True; |
11904 | ||
d8db0bca JM |
11905 | -- The only other case needing an actual subtype is an unconstrained |
11906 | -- record type which is an IN parameter (we cannot generate actual | |
11907 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
11908 | -- change the discriminant values. However we exclude the case of | |
11909 | -- initialization procedures, since discriminants are handled very | |
11910 | -- specially in this context, see the section entitled "Handling of | |
11911 | -- Discriminants" in Einfo. | |
11912 | ||
11913 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
ca90b962 | 11914 | -- in front-end layout mode for size/offset values), since in such |
d8db0bca JM |
11915 | -- functions only discriminants are referenced, and not only are such |
11916 | -- subtypes not needed, but they cannot always be generated, because | |
11917 | -- of order of elaboration issues. | |
996ae0b0 RK |
11918 | |
11919 | elsif Is_Record_Type (T) | |
11920 | and then Ekind (Formal) = E_In_Parameter | |
11921 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 11922 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
11923 | and then not Is_Discrim_SO_Function (Subp) |
11924 | then | |
11925 | AS_Needed := True; | |
11926 | ||
11927 | -- All other cases do not need an actual subtype | |
11928 | ||
11929 | else | |
11930 | AS_Needed := False; | |
11931 | end if; | |
11932 | ||
11933 | -- Generate actual subtypes for unconstrained arrays and | |
11934 | -- unconstrained discriminated records. | |
11935 | ||
11936 | if AS_Needed then | |
7324bf49 | 11937 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 11938 | |
57a8057a | 11939 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
11940 | -- variable that renames the corresponding entry of the |
11941 | -- parameter block, and it is this local variable that may | |
da94696d | 11942 | -- require an actual subtype. |
fbf5a39b | 11943 | |
4460a9bc | 11944 | if Expander_Active then |
fbf5a39b AC |
11945 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
11946 | else | |
11947 | Decl := Build_Actual_Subtype (T, Formal); | |
11948 | end if; | |
11949 | ||
996ae0b0 RK |
11950 | if Present (Handled_Statement_Sequence (N)) then |
11951 | First_Stmt := | |
11952 | First (Statements (Handled_Statement_Sequence (N))); | |
11953 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
11954 | Mark_Rewrite_Insertion (Decl); | |
11955 | else | |
82c80734 RD |
11956 | -- If the accept statement has no body, there will be no |
11957 | -- reference to the actuals, so no need to compute actual | |
11958 | -- subtypes. | |
996ae0b0 RK |
11959 | |
11960 | return; | |
11961 | end if; | |
11962 | ||
11963 | else | |
fbf5a39b | 11964 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
11965 | Prepend (Decl, Declarations (N)); |
11966 | Mark_Rewrite_Insertion (Decl); | |
11967 | end if; | |
11968 | ||
82c80734 RD |
11969 | -- The declaration uses the bounds of an existing object, and |
11970 | -- therefore needs no constraint checks. | |
2820d220 | 11971 | |
7324bf49 | 11972 | Analyze (Decl, Suppress => All_Checks); |
405b907c | 11973 | Set_Is_Actual_Subtype (Defining_Identifier (Decl)); |
2820d220 | 11974 | |
996ae0b0 RK |
11975 | -- We need to freeze manually the generated type when it is |
11976 | -- inserted anywhere else than in a declarative part. | |
11977 | ||
11978 | if Present (First_Stmt) then | |
11979 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 11980 | Freeze_Entity (Defining_Identifier (Decl), N)); |
fcadacf7 ES |
11981 | |
11982 | -- Ditto if the type has a dynamic predicate, because the | |
22da8770 AC |
11983 | -- generated function will mention the actual subtype. The |
11984 | -- predicate may come from an explicit aspect of be inherited. | |
fcadacf7 | 11985 | |
22da8770 | 11986 | elsif Has_Predicates (T) then |
fcadacf7 ES |
11987 | Insert_List_Before_And_Analyze (Decl, |
11988 | Freeze_Entity (Defining_Identifier (Decl), N)); | |
996ae0b0 RK |
11989 | end if; |
11990 | ||
fbf5a39b | 11991 | if Nkind (N) = N_Accept_Statement |
4460a9bc | 11992 | and then Expander_Active |
fbf5a39b AC |
11993 | then |
11994 | Set_Actual_Subtype (Renamed_Object (Formal), | |
11995 | Defining_Identifier (Decl)); | |
11996 | else | |
11997 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
11998 | end if; | |
996ae0b0 RK |
11999 | end if; |
12000 | ||
12001 | Next_Formal (Formal); | |
12002 | end loop; | |
12003 | end Set_Actual_Subtypes; | |
12004 | ||
12005 | --------------------- | |
12006 | -- Set_Formal_Mode -- | |
12007 | --------------------- | |
12008 | ||
12009 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
07aa5e6f | 12010 | Spec : constant Node_Id := Parent (Formal_Id); |
288cbbbd | 12011 | Id : constant Entity_Id := Scope (Formal_Id); |
996ae0b0 RK |
12012 | |
12013 | begin | |
12014 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
12015 | -- since we ensure that corresponding actuals are always valid at the | |
12016 | -- point of the call. | |
12017 | ||
12018 | if Out_Present (Spec) then | |
288cbbbd JM |
12019 | if Ekind_In (Id, E_Entry, E_Entry_Family) |
12020 | or else Is_Subprogram_Or_Generic_Subprogram (Id) | |
12021 | then | |
12022 | Set_Has_Out_Or_In_Out_Parameter (Id, True); | |
12023 | end if; | |
12024 | ||
12025 | if Ekind_In (Id, E_Function, E_Generic_Function) then | |
fc999c5d | 12026 | |
b4ca2d2c | 12027 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
12028 | |
12029 | if Ada_Version >= Ada_2012 then | |
e6425869 AC |
12030 | |
12031 | -- Even in Ada 2012 operators can only have IN parameters | |
12032 | ||
12033 | if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then | |
12034 | Error_Msg_N ("operators can only have IN parameters", Spec); | |
12035 | end if; | |
12036 | ||
c56a9ba4 AC |
12037 | if In_Present (Spec) then |
12038 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
12039 | else | |
12040 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
12041 | end if; | |
12042 | ||
b4ca2d2c AC |
12043 | -- But not in earlier versions of Ada |
12044 | ||
c56a9ba4 AC |
12045 | else |
12046 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
12047 | Set_Ekind (Formal_Id, E_In_Parameter); | |
12048 | end if; | |
996ae0b0 RK |
12049 | |
12050 | elsif In_Present (Spec) then | |
12051 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
12052 | ||
12053 | else | |
fbf5a39b AC |
12054 | Set_Ekind (Formal_Id, E_Out_Parameter); |
12055 | Set_Never_Set_In_Source (Formal_Id, True); | |
12056 | Set_Is_True_Constant (Formal_Id, False); | |
12057 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
12058 | end if; |
12059 | ||
12060 | else | |
12061 | Set_Ekind (Formal_Id, E_In_Parameter); | |
12062 | end if; | |
12063 | ||
fbf5a39b | 12064 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
12065 | -- guarantees that access parameters are always non-null. We also set |
12066 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
12067 | |
12068 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 12069 | |
885c4871 | 12070 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 12071 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 12072 | |
0791fbe9 | 12073 | if Ada_Version < Ada_2005 |
2813bb6b | 12074 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
12075 | then |
12076 | Set_Is_Known_Non_Null (Formal_Id); | |
12077 | Set_Can_Never_Be_Null (Formal_Id); | |
12078 | end if; | |
2813bb6b | 12079 | |
41251c60 JM |
12080 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
12081 | ||
2813bb6b ES |
12082 | elsif Is_Access_Type (Etype (Formal_Id)) |
12083 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
12084 | then | |
2813bb6b | 12085 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
12086 | |
12087 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
12088 | -- access checks) for the case of an IN parameter, which cannot | |
12089 | -- be changed, or for an IN OUT parameter, which can be changed but | |
12090 | -- not to a null value. But for an OUT parameter, the initial value | |
12091 | -- passed in can be null, so we can't set this flag in that case. | |
12092 | ||
12093 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
12094 | Set_Can_Never_Be_Null (Formal_Id); | |
12095 | end if; | |
fbf5a39b AC |
12096 | end if; |
12097 | ||
996ae0b0 RK |
12098 | Set_Mechanism (Formal_Id, Default_Mechanism); |
12099 | Set_Formal_Validity (Formal_Id); | |
12100 | end Set_Formal_Mode; | |
12101 | ||
12102 | ------------------------- | |
12103 | -- Set_Formal_Validity -- | |
12104 | ------------------------- | |
12105 | ||
12106 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
12107 | begin | |
82c80734 RD |
12108 | -- If no validity checking, then we cannot assume anything about the |
12109 | -- validity of parameters, since we do not know there is any checking | |
12110 | -- of the validity on the call side. | |
996ae0b0 RK |
12111 | |
12112 | if not Validity_Checks_On then | |
12113 | return; | |
12114 | ||
fbf5a39b AC |
12115 | -- If validity checking for parameters is enabled, this means we are |
12116 | -- not supposed to make any assumptions about argument values. | |
12117 | ||
12118 | elsif Validity_Check_Parameters then | |
12119 | return; | |
12120 | ||
12121 | -- If we are checking in parameters, we will assume that the caller is | |
12122 | -- also checking parameters, so we can assume the parameter is valid. | |
12123 | ||
996ae0b0 RK |
12124 | elsif Ekind (Formal_Id) = E_In_Parameter |
12125 | and then Validity_Check_In_Params | |
12126 | then | |
12127 | Set_Is_Known_Valid (Formal_Id, True); | |
12128 | ||
fbf5a39b AC |
12129 | -- Similar treatment for IN OUT parameters |
12130 | ||
996ae0b0 RK |
12131 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
12132 | and then Validity_Check_In_Out_Params | |
12133 | then | |
12134 | Set_Is_Known_Valid (Formal_Id, True); | |
12135 | end if; | |
12136 | end Set_Formal_Validity; | |
12137 | ||
12138 | ------------------------ | |
12139 | -- Subtype_Conformant -- | |
12140 | ------------------------ | |
12141 | ||
ce2b6ba5 JM |
12142 | function Subtype_Conformant |
12143 | (New_Id : Entity_Id; | |
12144 | Old_Id : Entity_Id; | |
12145 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
12146 | is | |
996ae0b0 | 12147 | Result : Boolean; |
996ae0b0 | 12148 | begin |
ce2b6ba5 JM |
12149 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
12150 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
12151 | return Result; |
12152 | end Subtype_Conformant; | |
12153 | ||
12154 | --------------------- | |
12155 | -- Type_Conformant -- | |
12156 | --------------------- | |
12157 | ||
41251c60 JM |
12158 | function Type_Conformant |
12159 | (New_Id : Entity_Id; | |
12160 | Old_Id : Entity_Id; | |
12161 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
12162 | is | |
996ae0b0 | 12163 | Result : Boolean; |
996ae0b0 | 12164 | begin |
c8ef728f | 12165 | May_Hide_Profile := False; |
41251c60 JM |
12166 | Check_Conformance |
12167 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
12168 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
12169 | return Result; |
12170 | end Type_Conformant; | |
12171 | ||
12172 | ------------------------------- | |
12173 | -- Valid_Operator_Definition -- | |
12174 | ------------------------------- | |
12175 | ||
12176 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
12177 | N : Integer := 0; | |
12178 | F : Entity_Id; | |
12179 | Id : constant Name_Id := Chars (Designator); | |
12180 | N_OK : Boolean; | |
12181 | ||
12182 | begin | |
12183 | F := First_Formal (Designator); | |
996ae0b0 RK |
12184 | while Present (F) loop |
12185 | N := N + 1; | |
12186 | ||
12187 | if Present (Default_Value (F)) then | |
ed2233dc | 12188 | Error_Msg_N |
996ae0b0 RK |
12189 | ("default values not allowed for operator parameters", |
12190 | Parent (F)); | |
220d1fd9 AC |
12191 | |
12192 | -- For function instantiations that are operators, we must check | |
12193 | -- separately that the corresponding generic only has in-parameters. | |
84c0a895 AC |
12194 | -- For subprogram declarations this is done in Set_Formal_Mode. Such |
12195 | -- an error could not arise in earlier versions of the language. | |
220d1fd9 AC |
12196 | |
12197 | elsif Ekind (F) /= E_In_Parameter then | |
84c0a895 | 12198 | Error_Msg_N ("operators can only have IN parameters", F); |
996ae0b0 RK |
12199 | end if; |
12200 | ||
12201 | Next_Formal (F); | |
12202 | end loop; | |
12203 | ||
12204 | -- Verify that user-defined operators have proper number of arguments | |
12205 | -- First case of operators which can only be unary | |
12206 | ||
b69cd36a | 12207 | if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
996ae0b0 RK |
12208 | N_OK := (N = 1); |
12209 | ||
12210 | -- Case of operators which can be unary or binary | |
12211 | ||
b69cd36a | 12212 | elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
12213 | N_OK := (N in 1 .. 2); |
12214 | ||
12215 | -- All other operators can only be binary | |
12216 | ||
12217 | else | |
12218 | N_OK := (N = 2); | |
12219 | end if; | |
12220 | ||
12221 | if not N_OK then | |
12222 | Error_Msg_N | |
12223 | ("incorrect number of arguments for operator", Designator); | |
12224 | end if; | |
12225 | ||
12226 | if Id = Name_Op_Ne | |
12227 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
12228 | and then not Is_Intrinsic_Subprogram (Designator) | |
12229 | then | |
12230 | Error_Msg_N | |
84c0a895 | 12231 | ("explicit definition of inequality not allowed", Designator); |
996ae0b0 RK |
12232 | end if; |
12233 | end Valid_Operator_Definition; | |
12234 | ||
12235 | end Sem_Ch6; |