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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 | -- -- |
77a40ec1 | 9 | -- Copyright (C) 1992-2014, Free Software Foundation, Inc. -- |
996ae0b0 RK |
10 | -- -- |
11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
996ae0b0 RK |
14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
17 | -- for more details. You should have received a copy of the GNU General -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
996ae0b0 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
996ae0b0 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
80e59506 | 26 | with Aspects; use Aspects; |
996ae0b0 RK |
27 | with Atree; use Atree; |
28 | with Checks; use Checks; | |
29 | with Debug; use Debug; | |
30 | with Einfo; use Einfo; | |
31 | with Elists; use Elists; | |
32 | with Errout; use Errout; | |
33 | with Expander; use Expander; | |
ec4867fa | 34 | with Exp_Ch6; use Exp_Ch6; |
996ae0b0 | 35 | with Exp_Ch7; use Exp_Ch7; |
21d27997 | 36 | with Exp_Ch9; use Exp_Ch9; |
616547fa | 37 | with Exp_Dbug; use Exp_Dbug; |
ce2b6ba5 | 38 | with Exp_Disp; use Exp_Disp; |
e660dbf7 | 39 | with Exp_Tss; use Exp_Tss; |
ec4867fa | 40 | with Exp_Util; use Exp_Util; |
fbf5a39b | 41 | with Fname; use Fname; |
996ae0b0 | 42 | with Freeze; use Freeze; |
540d8610 | 43 | with Inline; use Inline; |
41251c60 | 44 | with Itypes; use Itypes; |
996ae0b0 | 45 | with Lib.Xref; use Lib.Xref; |
ec4867fa | 46 | with Layout; use Layout; |
996ae0b0 RK |
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; | |
b20de9b9 AC |
53 | with Restrict; use Restrict; |
54 | with Rident; use Rident; | |
996ae0b0 RK |
55 | with Rtsfind; use Rtsfind; |
56 | with Sem; use Sem; | |
a4100e55 | 57 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
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; | |
9bc856dd | 63 | with Sem_Ch10; use Sem_Ch10; |
996ae0b0 | 64 | with Sem_Ch12; use Sem_Ch12; |
0f1a6a0b | 65 | with Sem_Ch13; use Sem_Ch13; |
dec6faf1 | 66 | with Sem_Dim; use Sem_Dim; |
996ae0b0 RK |
67 | with Sem_Disp; use Sem_Disp; |
68 | with Sem_Dist; use Sem_Dist; | |
69 | with Sem_Elim; use Sem_Elim; | |
70 | with Sem_Eval; use Sem_Eval; | |
71 | with Sem_Mech; use Sem_Mech; | |
72 | with Sem_Prag; use Sem_Prag; | |
73 | with Sem_Res; use Sem_Res; | |
74 | with Sem_Util; use Sem_Util; | |
75 | with Sem_Type; use Sem_Type; | |
76 | with Sem_Warn; use Sem_Warn; | |
77 | with Sinput; use Sinput; | |
78 | with Stand; use Stand; | |
79 | with Sinfo; use Sinfo; | |
80 | with Sinfo.CN; use Sinfo.CN; | |
81 | with Snames; use Snames; | |
82 | with Stringt; use Stringt; | |
83 | with Style; | |
84 | with Stylesw; use Stylesw; | |
8417f4b2 | 85 | with Targparm; use Targparm; |
996ae0b0 RK |
86 | with Tbuild; use Tbuild; |
87 | with Uintp; use Uintp; | |
88 | with Urealp; use Urealp; | |
89 | with Validsw; use Validsw; | |
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 | ||
4d8f3296 ES |
106 | procedure Analyze_Null_Procedure |
107 | (N : Node_Id; | |
108 | Is_Completion : out Boolean); | |
9d2a2071 | 109 | -- A null procedure can be a declaration or (Ada 2012) a completion |
4d8f3296 | 110 | |
5d37ba92 | 111 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 112 | -- Common processing for simple and extended return statements |
ec4867fa ES |
113 | |
114 | procedure Analyze_Function_Return (N : Node_Id); | |
81db9d77 ES |
115 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement |
116 | -- applies to a [generic] function. | |
ec4867fa | 117 | |
82c80734 RD |
118 | procedure Analyze_Return_Type (N : Node_Id); |
119 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 120 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
121 | -- outer homographs. |
122 | ||
b1b543d2 | 123 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
124 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
125 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 126 | |
996ae0b0 | 127 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); |
82c80734 RD |
128 | -- Analyze a generic subprogram body. N is the body to be analyzed, and |
129 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
996ae0b0 | 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 | ||
155 | procedure Check_Subprogram_Order (N : Node_Id); | |
156 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
157 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
158 | ||
996ae0b0 RK |
159 | procedure Check_Returns |
160 | (HSS : Node_Id; | |
161 | Mode : Character; | |
c8ef728f ES |
162 | Err : out Boolean; |
163 | Proc : Entity_Id := Empty); | |
164 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 165 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
166 | -- handled statement sequence for the subprogram body. This procedure |
167 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
168 | -- used for functions) or do not have a return (Mode = 'P', used for | |
169 | -- No_Return procedures). The flag Err is set if there are any control | |
170 | -- paths not explicitly terminated by a return in the function case, and is | |
171 | -- True otherwise. Proc is the entity for the procedure case and is used | |
172 | -- in posting the warning message. | |
996ae0b0 | 173 | |
e5a58fac AC |
174 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
175 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
176 | -- must appear before the type is frozen, and have the same visibility as | |
177 | -- that of the type. This procedure checks that this rule is met, and | |
178 | -- otherwise emits an error on the subprogram declaration and a warning | |
b2834fbd AC |
179 | -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode, |
180 | -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier | |
181 | -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility | |
182 | -- is set, otherwise the call has no effect. | |
e5a58fac | 183 | |
996ae0b0 | 184 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
185 | -- This procedure makes S, a new overloaded entity, into the first visible |
186 | -- entity with that name. | |
996ae0b0 | 187 | |
a5b62485 AC |
188 | function Is_Non_Overriding_Operation |
189 | (Prev_E : Entity_Id; | |
190 | New_E : Entity_Id) return Boolean; | |
191 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
192 | -- overrides an inherited operation only if the corresponding operation | |
260359e3 AC |
193 | -- was overriding in the generic. This needs to be checked for primitive |
194 | -- operations of types derived (in the generic unit) from formal private | |
195 | -- or formal derived types. | |
a5b62485 | 196 | |
996ae0b0 RK |
197 | procedure Make_Inequality_Operator (S : Entity_Id); |
198 | -- Create the declaration for an inequality operator that is implicitly | |
199 | -- created by a user-defined equality operator that yields a boolean. | |
200 | ||
996ae0b0 RK |
201 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
202 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
203 | -- setting the proper validity status for this entity, which depends on |
204 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
205 | |
206 | --------------------------------------------- | |
207 | -- Analyze_Abstract_Subprogram_Declaration -- | |
208 | --------------------------------------------- | |
209 | ||
210 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
fbf5a39b AC |
211 | Designator : constant Entity_Id := |
212 | Analyze_Subprogram_Specification (Specification (N)); | |
996ae0b0 RK |
213 | Scop : constant Entity_Id := Current_Scope; |
214 | ||
215 | begin | |
2ba431e5 | 216 | Check_SPARK_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 217 | |
996ae0b0 | 218 | Generate_Definition (Designator); |
dac3bede | 219 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
f937473f | 220 | Set_Is_Abstract_Subprogram (Designator); |
996ae0b0 RK |
221 | New_Overloaded_Entity (Designator); |
222 | Check_Delayed_Subprogram (Designator); | |
223 | ||
fbf5a39b | 224 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 RK |
225 | |
226 | if Ekind (Scope (Designator)) = E_Protected_Type then | |
227 | Error_Msg_N | |
228 | ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
229 | |
230 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
231 | -- operation nor an operation that overrides an inherited subprogram or | |
232 | -- predefined operator, since this most likely indicates a mistake. | |
233 | ||
234 | elsif Warn_On_Redundant_Constructs | |
235 | and then not Is_Dispatching_Operation (Designator) | |
038140ed | 236 | and then not Present (Overridden_Operation (Designator)) |
5d37ba92 ES |
237 | and then (not Is_Operator_Symbol_Name (Chars (Designator)) |
238 | or else Scop /= Scope (Etype (First_Formal (Designator)))) | |
239 | then | |
240 | Error_Msg_N | |
dbfeb4fa | 241 | ("abstract subprogram is not dispatching or overriding?r?", N); |
996ae0b0 | 242 | end if; |
fbf5a39b AC |
243 | |
244 | Generate_Reference_To_Formals (Designator); | |
361effb1 | 245 | Check_Eliminated (Designator); |
eaba57fb RD |
246 | |
247 | if Has_Aspects (N) then | |
248 | Analyze_Aspect_Specifications (N, Designator); | |
249 | end if; | |
996ae0b0 RK |
250 | end Analyze_Abstract_Subprogram_Declaration; |
251 | ||
b0186f71 AC |
252 | --------------------------------- |
253 | -- Analyze_Expression_Function -- | |
254 | --------------------------------- | |
255 | ||
256 | procedure Analyze_Expression_Function (N : Node_Id) is | |
257 | Loc : constant Source_Ptr := Sloc (N); | |
258 | LocX : constant Source_Ptr := Sloc (Expression (N)); | |
0b5b2bbc | 259 | Expr : constant Node_Id := Expression (N); |
d2d4b355 AC |
260 | Spec : constant Node_Id := Specification (N); |
261 | ||
8a06151a | 262 | Def_Id : Entity_Id; |
b0186f71 | 263 | |
8a06151a | 264 | Prev : Entity_Id; |
b0186f71 | 265 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
266 | -- declaration is completed. Def_Id is needed to analyze the spec. |
267 | ||
268 | New_Body : Node_Id; | |
d2d4b355 | 269 | New_Spec : Node_Id; |
b913199e | 270 | Ret : Node_Id; |
b0186f71 AC |
271 | |
272 | begin | |
273 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 274 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
275 | -- function into an equivalent subprogram body, and analyze it. |
276 | ||
277 | -- Expression functions are inlined unconditionally. The back-end will | |
278 | -- determine whether this is possible. | |
279 | ||
280 | Inline_Processing_Required := True; | |
b727a82b AC |
281 | |
282 | -- Create a specification for the generated body. Types and defauts in | |
283 | -- the profile are copies of the spec, but new entities must be created | |
284 | -- for the unit name and the formals. | |
285 | ||
286 | New_Spec := New_Copy_Tree (Spec); | |
287 | Set_Defining_Unit_Name (New_Spec, | |
288 | Make_Defining_Identifier (Sloc (Defining_Unit_Name (Spec)), | |
289 | Chars (Defining_Unit_Name (Spec)))); | |
290 | ||
291 | if Present (Parameter_Specifications (New_Spec)) then | |
292 | declare | |
293 | Formal_Spec : Node_Id; | |
a6abfd78 AC |
294 | Def : Entity_Id; |
295 | ||
b727a82b AC |
296 | begin |
297 | Formal_Spec := First (Parameter_Specifications (New_Spec)); | |
b2afe274 AC |
298 | |
299 | -- Create a new formal parameter at the same source position | |
300 | ||
b727a82b | 301 | while Present (Formal_Spec) loop |
a6abfd78 AC |
302 | Def := Defining_Identifier (Formal_Spec); |
303 | Set_Defining_Identifier (Formal_Spec, | |
304 | Make_Defining_Identifier (Sloc (Def), | |
305 | Chars => Chars (Def))); | |
b727a82b AC |
306 | Next (Formal_Spec); |
307 | end loop; | |
308 | end; | |
309 | end if; | |
310 | ||
51597c23 | 311 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); |
d2d4b355 AC |
312 | |
313 | -- If there are previous overloadable entities with the same name, | |
314 | -- check whether any of them is completed by the expression function. | |
315 | ||
8a06151a | 316 | if Present (Prev) and then Is_Overloadable (Prev) then |
51597c23 AC |
317 | Def_Id := Analyze_Subprogram_Specification (Spec); |
318 | Prev := Find_Corresponding_Spec (N); | |
d2d4b355 | 319 | end if; |
b0186f71 | 320 | |
b913199e AC |
321 | Ret := Make_Simple_Return_Statement (LocX, Expression (N)); |
322 | ||
b0186f71 AC |
323 | New_Body := |
324 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 325 | Specification => New_Spec, |
b0186f71 AC |
326 | Declarations => Empty_List, |
327 | Handled_Statement_Sequence => | |
328 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 329 | Statements => New_List (Ret))); |
b0186f71 | 330 | |
e7f23f06 AC |
331 | -- If the expression completes a generic subprogram, we must create a |
332 | -- separate node for the body, because at instantiation the original | |
333 | -- node of the generic copy must be a generic subprogram body, and | |
334 | -- cannot be a expression function. Otherwise we just rewrite the | |
335 | -- expression with the non-generic body. | |
336 | ||
6d7e5c54 | 337 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
e7f23f06 | 338 | Insert_After (N, New_Body); |
6d7e5c54 | 339 | |
e7f23f06 AC |
340 | -- Propagate any aspects or pragmas that apply to the expression |
341 | -- function to the proper body when the expression function acts | |
342 | -- as a completion. | |
343 | ||
344 | if Has_Aspects (N) then | |
345 | Move_Aspects (N, To => New_Body); | |
346 | end if; | |
347 | ||
348 | Relocate_Pragmas_To_Body (New_Body); | |
b0186f71 | 349 | |
b0186f71 | 350 | Rewrite (N, Make_Null_Statement (Loc)); |
d2d4b355 | 351 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
352 | Analyze (N); |
353 | Analyze (New_Body); | |
d2b10647 | 354 | Set_Is_Inlined (Prev); |
b0186f71 | 355 | |
e5c4e2bc AC |
356 | -- If the expression function is a completion, the previous declaration |
357 | -- must come from source. We know already that appears in the current | |
358 | -- scope. The entity itself may be internally created if within a body | |
359 | -- to be inlined. | |
360 | ||
361 | elsif Present (Prev) and then Comes_From_Source (Parent (Prev)) then | |
d2d4b355 | 362 | Set_Has_Completion (Prev, False); |
76264f60 | 363 | |
c6d2191a AC |
364 | -- An expression function that is a completion freezes the |
365 | -- expression. This means freezing the return type, and if it is | |
366 | -- an access type, freezing its designated type as well. | |
1b31321b | 367 | |
c6d2191a | 368 | -- Note that we cannot defer this freezing to the analysis of the |
1b31321b AC |
369 | -- expression itself, because a freeze node might appear in a nested |
370 | -- scope, leading to an elaboration order issue in gigi. | |
c6d2191a AC |
371 | |
372 | Freeze_Before (N, Etype (Prev)); | |
1b31321b | 373 | |
c6d2191a AC |
374 | if Is_Access_Type (Etype (Prev)) then |
375 | Freeze_Before (N, Designated_Type (Etype (Prev))); | |
376 | end if; | |
377 | ||
76264f60 AC |
378 | -- For navigation purposes, indicate that the function is a body |
379 | ||
380 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 381 | Rewrite (N, New_Body); |
e7f23f06 | 382 | |
c0cdbd39 AC |
383 | -- Correct the parent pointer of the aspect specification list to |
384 | -- reference the rewritten node. | |
385 | ||
386 | if Has_Aspects (N) then | |
387 | Set_Parent (Aspect_Specifications (N), N); | |
388 | end if; | |
389 | ||
e7f23f06 AC |
390 | -- Propagate any pragmas that apply to the expression function to the |
391 | -- proper body when the expression function acts as a completion. | |
392 | -- Aspects are automatically transfered because of node rewriting. | |
393 | ||
394 | Relocate_Pragmas_To_Body (N); | |
d2b10647 ES |
395 | Analyze (N); |
396 | ||
6d7e5c54 AC |
397 | -- Prev is the previous entity with the same name, but it is can |
398 | -- be an unrelated spec that is not completed by the expression | |
399 | -- function. In that case the relevant entity is the one in the body. | |
400 | -- Not clear that the backend can inline it in this case ??? | |
401 | ||
402 | if Has_Completion (Prev) then | |
403 | Set_Is_Inlined (Prev); | |
31af8899 AC |
404 | |
405 | -- The formals of the expression function are body formals, | |
406 | -- and do not appear in the ali file, which will only contain | |
407 | -- references to the formals of the original subprogram spec. | |
408 | ||
409 | declare | |
410 | F1 : Entity_Id; | |
411 | F2 : Entity_Id; | |
412 | ||
413 | begin | |
414 | F1 := First_Formal (Def_Id); | |
415 | F2 := First_Formal (Prev); | |
416 | ||
417 | while Present (F1) loop | |
418 | Set_Spec_Entity (F1, F2); | |
419 | Next_Formal (F1); | |
420 | Next_Formal (F2); | |
421 | end loop; | |
422 | end; | |
423 | ||
6d7e5c54 AC |
424 | else |
425 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
426 | end if; | |
427 | ||
0b5b2bbc | 428 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 429 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
430 | |
431 | else | |
a52e6d7e AC |
432 | -- An expression function that is not a completion is not a |
433 | -- subprogram declaration, and thus cannot appear in a protected | |
434 | -- definition. | |
435 | ||
436 | if Nkind (Parent (N)) = N_Protected_Definition then | |
437 | Error_Msg_N | |
438 | ("an expression function is not a legal protected operation", N); | |
439 | end if; | |
440 | ||
b8e6830b | 441 | Rewrite (N, Make_Subprogram_Declaration (Loc, Specification => Spec)); |
c0cdbd39 AC |
442 | |
443 | -- Correct the parent pointer of the aspect specification list to | |
444 | -- reference the rewritten node. | |
445 | ||
446 | if Has_Aspects (N) then | |
447 | Set_Parent (Aspect_Specifications (N), N); | |
448 | end if; | |
449 | ||
b0186f71 | 450 | Analyze (N); |
b8e6830b AC |
451 | Set_Is_Inlined (Defining_Entity (N)); |
452 | ||
453 | -- Establish the linkages between the spec and the body. These are | |
454 | -- used when the expression function acts as the prefix of attribute | |
455 | -- 'Access in order to freeze the original expression which has been | |
456 | -- moved to the generated body. | |
457 | ||
458 | Set_Corresponding_Body (N, Defining_Entity (New_Body)); | |
459 | Set_Corresponding_Spec (New_Body, Defining_Entity (N)); | |
d2b10647 | 460 | |
6d7e5c54 AC |
461 | -- To prevent premature freeze action, insert the new body at the end |
462 | -- of the current declarations, or at the end of the package spec. | |
b913199e | 463 | -- However, resolve usage names now, to prevent spurious visibility |
ad4e3362 ES |
464 | -- on later entities. Note that the function can now be called in |
465 | -- the current declarative part, which will appear to be prior to | |
466 | -- the presence of the body in the code. There are nevertheless no | |
467 | -- order of elaboration issues because all name resolution has taken | |
468 | -- place at the point of declaration. | |
6d7e5c54 AC |
469 | |
470 | declare | |
e876c43a AC |
471 | Decls : List_Id := List_Containing (N); |
472 | Par : constant Node_Id := Parent (Decls); | |
b8e6830b | 473 | Id : constant Entity_Id := Defining_Entity (N); |
6d7e5c54 AC |
474 | |
475 | begin | |
476 | if Nkind (Par) = N_Package_Specification | |
8fde064e AC |
477 | and then Decls = Visible_Declarations (Par) |
478 | and then Present (Private_Declarations (Par)) | |
479 | and then not Is_Empty_List (Private_Declarations (Par)) | |
6d7e5c54 AC |
480 | then |
481 | Decls := Private_Declarations (Par); | |
482 | end if; | |
483 | ||
484 | Insert_After (Last (Decls), New_Body); | |
b913199e AC |
485 | Push_Scope (Id); |
486 | Install_Formals (Id); | |
3a8e3f63 | 487 | |
d8a764c4 AC |
488 | -- Preanalyze the expression for name capture, except in an |
489 | -- instance, where this has been done during generic analysis, | |
490 | -- and will be redone when analyzing the body. | |
845f06e2 AC |
491 | |
492 | declare | |
4058ddcc AC |
493 | Expr : constant Node_Id := Expression (Ret); |
494 | ||
845f06e2 AC |
495 | begin |
496 | Set_Parent (Expr, Ret); | |
4058ddcc | 497 | |
d8a764c4 AC |
498 | if not In_Instance then |
499 | Preanalyze_Spec_Expression (Expr, Etype (Id)); | |
500 | end if; | |
845f06e2 | 501 | end; |
3a8e3f63 | 502 | |
b913199e | 503 | End_Scope; |
6d7e5c54 | 504 | end; |
b0186f71 | 505 | end if; |
0b5b2bbc AC |
506 | |
507 | -- If the return expression is a static constant, we suppress warning | |
508 | -- messages on unused formals, which in most cases will be noise. | |
509 | ||
510 | Set_Is_Trivial_Subprogram (Defining_Entity (New_Body), | |
511 | Is_OK_Static_Expression (Expr)); | |
b0186f71 AC |
512 | end Analyze_Expression_Function; |
513 | ||
ec4867fa ES |
514 | ---------------------------------------- |
515 | -- Analyze_Extended_Return_Statement -- | |
516 | ---------------------------------------- | |
517 | ||
518 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
519 | begin | |
c86cf714 | 520 | Check_Compiler_Unit ("extended return statement", N); |
5d37ba92 | 521 | Analyze_Return_Statement (N); |
ec4867fa ES |
522 | end Analyze_Extended_Return_Statement; |
523 | ||
996ae0b0 RK |
524 | ---------------------------- |
525 | -- Analyze_Function_Call -- | |
526 | ---------------------------- | |
527 | ||
528 | procedure Analyze_Function_Call (N : Node_Id) is | |
a7e68e7f HK |
529 | Actuals : constant List_Id := Parameter_Associations (N); |
530 | Func_Nam : constant Node_Id := Name (N); | |
531 | Actual : Node_Id; | |
532 | ||
996ae0b0 | 533 | begin |
a7e68e7f | 534 | Analyze (Func_Nam); |
996ae0b0 | 535 | |
3e7302c3 AC |
536 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
537 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
538 | -- has been analyzed and we just return. | |
82c80734 | 539 | |
a7e68e7f HK |
540 | if Nkind (Func_Nam) = N_Selected_Component |
541 | and then Name (N) /= Func_Nam | |
82c80734 RD |
542 | and then Is_Rewrite_Substitution (N) |
543 | and then Present (Etype (N)) | |
544 | then | |
545 | return; | |
546 | end if; | |
547 | ||
996ae0b0 RK |
548 | -- If error analyzing name, then set Any_Type as result type and return |
549 | ||
a7e68e7f | 550 | if Etype (Func_Nam) = Any_Type then |
996ae0b0 RK |
551 | Set_Etype (N, Any_Type); |
552 | return; | |
553 | end if; | |
554 | ||
555 | -- Otherwise analyze the parameters | |
556 | ||
e24329cd YM |
557 | if Present (Actuals) then |
558 | Actual := First (Actuals); | |
996ae0b0 RK |
559 | while Present (Actual) loop |
560 | Analyze (Actual); | |
561 | Check_Parameterless_Call (Actual); | |
562 | Next (Actual); | |
563 | end loop; | |
564 | end if; | |
565 | ||
566 | Analyze_Call (N); | |
996ae0b0 RK |
567 | end Analyze_Function_Call; |
568 | ||
ec4867fa ES |
569 | ----------------------------- |
570 | -- Analyze_Function_Return -- | |
571 | ----------------------------- | |
572 | ||
573 | procedure Analyze_Function_Return (N : Node_Id) is | |
a7e68e7f HK |
574 | Loc : constant Source_Ptr := Sloc (N); |
575 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
576 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
ec4867fa | 577 | |
5d37ba92 | 578 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
579 | -- Function result subtype |
580 | ||
581 | procedure Check_Limited_Return (Expr : Node_Id); | |
582 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
583 | -- limited types. Used only for simple return statements. | |
584 | -- Expr is the expression returned. | |
585 | ||
586 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
587 | -- Check that the return_subtype_indication properly matches the result | |
588 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
589 | ||
590 | -------------------------- | |
591 | -- Check_Limited_Return -- | |
592 | -------------------------- | |
593 | ||
594 | procedure Check_Limited_Return (Expr : Node_Id) is | |
595 | begin | |
596 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
597 | -- removed and replaced by anonymous access results. This is an | |
598 | -- incompatibility with Ada 95. Not clear whether this should be | |
599 | -- enforced yet or perhaps controllable with special switch. ??? | |
600 | ||
ce72a9a3 AC |
601 | -- A limited interface that is not immutably limited is OK. |
602 | ||
603 | if Is_Limited_Interface (R_Type) | |
604 | and then | |
605 | not (Is_Task_Interface (R_Type) | |
606 | or else Is_Protected_Interface (R_Type) | |
607 | or else Is_Synchronized_Interface (R_Type)) | |
608 | then | |
609 | null; | |
610 | ||
611 | elsif Is_Limited_Type (R_Type) | |
612 | and then not Is_Interface (R_Type) | |
ec4867fa ES |
613 | and then Comes_From_Source (N) |
614 | and then not In_Instance_Body | |
2a31c32b | 615 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
616 | then |
617 | -- Error in Ada 2005 | |
618 | ||
0791fbe9 | 619 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
620 | and then not Debug_Flag_Dot_L |
621 | and then not GNAT_Mode | |
622 | then | |
623 | Error_Msg_N | |
624 | ("(Ada 2005) cannot copy object of a limited type " & | |
5d37ba92 | 625 | "(RM-2005 6.5(5.5/2))", Expr); |
e0ae93e2 | 626 | |
51245e2d | 627 | if Is_Limited_View (R_Type) then |
ec4867fa ES |
628 | Error_Msg_N |
629 | ("\return by reference not permitted in Ada 2005", Expr); | |
630 | end if; | |
631 | ||
632 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
633 | -- incompatibility. | |
634 | ||
635 | -- In GNAT mode, this is just a warning, to allow it to be | |
636 | -- evilly turned off. Otherwise it is a real error. | |
637 | ||
9694c039 AC |
638 | -- In a generic context, simplify the warning because it makes |
639 | -- no sense to discuss pass-by-reference or copy. | |
640 | ||
ec4867fa | 641 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
642 | if Inside_A_Generic then |
643 | Error_Msg_N | |
885c4871 | 644 | ("return of limited object not permitted in Ada 2005 " |
dbfeb4fa | 645 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
9694c039 | 646 | |
51245e2d | 647 | elsif Is_Limited_View (R_Type) then |
ec4867fa | 648 | Error_Msg_N |
20261dc1 | 649 | ("return by reference not permitted in Ada 2005 " |
dbfeb4fa | 650 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
651 | else |
652 | Error_Msg_N | |
20261dc1 | 653 | ("cannot copy object of a limited type in Ada 2005 " |
dbfeb4fa | 654 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
655 | end if; |
656 | ||
657 | -- Ada 95 mode, compatibility warnings disabled | |
658 | ||
659 | else | |
660 | return; -- skip continuation messages below | |
661 | end if; | |
662 | ||
9694c039 AC |
663 | if not Inside_A_Generic then |
664 | Error_Msg_N | |
665 | ("\consider switching to return of access type", Expr); | |
666 | Explain_Limited_Type (R_Type, Expr); | |
667 | end if; | |
ec4867fa ES |
668 | end if; |
669 | end Check_Limited_Return; | |
670 | ||
671 | ------------------------------------- | |
672 | -- Check_Return_Subtype_Indication -- | |
673 | ------------------------------------- | |
674 | ||
675 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
676 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
677 | ||
678 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
679 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
680 | |
681 | Subtype_Ind : constant Node_Id := | |
682 | Object_Definition (Original_Node (Obj_Decl)); | |
683 | ||
7f568bfa AC |
684 | R_Type_Is_Anon_Access : constant Boolean := |
685 | Ekind_In (R_Type, | |
686 | E_Anonymous_Access_Subprogram_Type, | |
687 | E_Anonymous_Access_Protected_Subprogram_Type, | |
688 | E_Anonymous_Access_Type); | |
ec4867fa ES |
689 | -- True if return type of the function is an anonymous access type |
690 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
691 | ||
7f568bfa AC |
692 | R_Stm_Type_Is_Anon_Access : constant Boolean := |
693 | Ekind_In (R_Stm_Type, | |
694 | E_Anonymous_Access_Subprogram_Type, | |
695 | E_Anonymous_Access_Protected_Subprogram_Type, | |
696 | E_Anonymous_Access_Type); | |
ec4867fa ES |
697 | -- True if type of the return object is an anonymous access type |
698 | ||
7f568bfa AC |
699 | procedure Error_No_Match (N : Node_Id); |
700 | -- Output error messages for case where types do not statically | |
701 | -- match. N is the location for the messages. | |
702 | ||
703 | -------------------- | |
704 | -- Error_No_Match -- | |
705 | -------------------- | |
706 | ||
707 | procedure Error_No_Match (N : Node_Id) is | |
708 | begin | |
709 | Error_Msg_N | |
710 | ("subtype must statically match function result subtype", N); | |
711 | ||
712 | if not Predicates_Match (R_Stm_Type, R_Type) then | |
713 | Error_Msg_Node_2 := R_Type; | |
714 | Error_Msg_NE | |
715 | ("\predicate of & does not match predicate of &", | |
716 | N, R_Stm_Type); | |
717 | end if; | |
718 | end Error_No_Match; | |
719 | ||
720 | -- Start of processing for Check_Return_Subtype_Indication | |
721 | ||
ec4867fa | 722 | begin |
7665e4bd | 723 | -- First, avoid cascaded errors |
ec4867fa ES |
724 | |
725 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
726 | return; | |
727 | end if; | |
728 | ||
729 | -- "return access T" case; check that the return statement also has | |
730 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 731 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
732 | |
733 | if R_Type_Is_Anon_Access then | |
734 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
735 | if |
736 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 737 | then |
53cf4600 ES |
738 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
739 | Base_Type (Designated_Type (R_Type)) | |
740 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
741 | then | |
7f568bfa | 742 | Error_No_Match (Subtype_Mark (Subtype_Ind)); |
53cf4600 ES |
743 | end if; |
744 | ||
745 | else | |
746 | -- For two anonymous access to subprogram types, the | |
747 | -- types themselves must be type conformant. | |
748 | ||
749 | if not Conforming_Types | |
750 | (R_Stm_Type, R_Type, Fully_Conformant) | |
751 | then | |
7f568bfa | 752 | Error_No_Match (Subtype_Ind); |
53cf4600 | 753 | end if; |
ec4867fa | 754 | end if; |
0a36105d | 755 | |
ec4867fa ES |
756 | else |
757 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
758 | end if; | |
759 | ||
6cce2156 GD |
760 | -- If the return object is of an anonymous access type, then report |
761 | -- an error if the function's result type is not also anonymous. | |
762 | ||
763 | elsif R_Stm_Type_Is_Anon_Access | |
764 | and then not R_Type_Is_Anon_Access | |
765 | then | |
766 | Error_Msg_N ("anonymous access not allowed for function with " & | |
767 | "named access result", Subtype_Ind); | |
768 | ||
81d93365 AC |
769 | -- Subtype indication case: check that the return object's type is |
770 | -- covered by the result type, and that the subtypes statically match | |
771 | -- when the result subtype is constrained. Also handle record types | |
772 | -- with unknown discriminants for which we have built the underlying | |
773 | -- record view. Coverage is needed to allow specific-type return | |
774 | -- objects when the result type is class-wide (see AI05-32). | |
775 | ||
776 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 777 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
778 | and then |
779 | Covers | |
780 | (Base_Type (R_Type), | |
781 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
782 | then |
783 | -- A null exclusion may be present on the return type, on the | |
784 | -- function specification, on the object declaration or on the | |
785 | -- subtype itself. | |
ec4867fa | 786 | |
21d27997 RD |
787 | if Is_Access_Type (R_Type) |
788 | and then | |
789 | (Can_Never_Be_Null (R_Type) | |
790 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
791 | Can_Never_Be_Null (R_Stm_Type) | |
792 | then | |
7f568bfa | 793 | Error_No_Match (Subtype_Ind); |
21d27997 RD |
794 | end if; |
795 | ||
105b5e65 | 796 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
797 | |
798 | if Is_Constrained (R_Type) | |
799 | or else Is_Access_Type (R_Type) | |
800 | then | |
ec4867fa | 801 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
7f568bfa | 802 | Error_No_Match (Subtype_Ind); |
ec4867fa ES |
803 | end if; |
804 | end if; | |
805 | ||
a8b346d2 RD |
806 | -- All remaining cases are illegal |
807 | ||
808 | -- Note: previous versions of this subprogram allowed the return | |
809 | -- value to be the ancestor of the return type if the return type | |
810 | -- was a null extension. This was plainly incorrect. | |
ff7139c3 | 811 | |
ec4867fa ES |
812 | else |
813 | Error_Msg_N | |
814 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
815 | end if; | |
816 | end Check_Return_Subtype_Indication; | |
817 | ||
818 | --------------------- | |
819 | -- Local Variables -- | |
820 | --------------------- | |
821 | ||
822 | Expr : Node_Id; | |
823 | ||
824 | -- Start of processing for Analyze_Function_Return | |
825 | ||
826 | begin | |
827 | Set_Return_Present (Scope_Id); | |
828 | ||
5d37ba92 | 829 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 830 | Expr := Expression (N); |
4ee646da | 831 | |
e917aec2 RD |
832 | -- Guard against a malformed expression. The parser may have tried to |
833 | -- recover but the node is not analyzable. | |
4ee646da AC |
834 | |
835 | if Nkind (Expr) = N_Error then | |
836 | Set_Etype (Expr, Any_Type); | |
837 | Expander_Mode_Save_And_Set (False); | |
838 | return; | |
839 | ||
840 | else | |
0180fd26 AC |
841 | -- The resolution of a controlled [extension] aggregate associated |
842 | -- with a return statement creates a temporary which needs to be | |
843 | -- finalized on function exit. Wrap the return statement inside a | |
844 | -- block so that the finalization machinery can detect this case. | |
845 | -- This early expansion is done only when the return statement is | |
846 | -- not part of a handled sequence of statements. | |
847 | ||
848 | if Nkind_In (Expr, N_Aggregate, | |
849 | N_Extension_Aggregate) | |
850 | and then Needs_Finalization (R_Type) | |
851 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
852 | then | |
853 | Rewrite (N, | |
854 | Make_Block_Statement (Loc, | |
855 | Handled_Statement_Sequence => | |
856 | Make_Handled_Sequence_Of_Statements (Loc, | |
857 | Statements => New_List (Relocate_Node (N))))); | |
858 | ||
859 | Analyze (N); | |
860 | return; | |
861 | end if; | |
862 | ||
4ee646da AC |
863 | Analyze_And_Resolve (Expr, R_Type); |
864 | Check_Limited_Return (Expr); | |
865 | end if; | |
ec4867fa | 866 | |
ad05f2e9 | 867 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 868 | |
fe5d3068 | 869 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
870 | and then |
871 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 872 | or else Present (Next (N))) |
607d0635 | 873 | then |
2ba431e5 | 874 | Check_SPARK_Restriction |
fe5d3068 | 875 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
876 | end if; |
877 | ||
ec4867fa | 878 | else |
2ba431e5 | 879 | Check_SPARK_Restriction ("extended RETURN is not allowed", N); |
607d0635 | 880 | |
ec4867fa ES |
881 | -- Analyze parts specific to extended_return_statement: |
882 | ||
883 | declare | |
de6cad7c | 884 | Obj_Decl : constant Node_Id := |
b9daa96e | 885 | Last (Return_Object_Declarations (N)); |
de6cad7c | 886 | Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
b9daa96e | 887 | HSS : constant Node_Id := Handled_Statement_Sequence (N); |
ec4867fa ES |
888 | |
889 | begin | |
890 | Expr := Expression (Obj_Decl); | |
891 | ||
892 | -- Note: The check for OK_For_Limited_Init will happen in | |
893 | -- Analyze_Object_Declaration; we treat it as a normal | |
894 | -- object declaration. | |
895 | ||
cd1c668b | 896 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
897 | Analyze (Obj_Decl); |
898 | ||
ec4867fa ES |
899 | Check_Return_Subtype_Indication (Obj_Decl); |
900 | ||
901 | if Present (HSS) then | |
902 | Analyze (HSS); | |
903 | ||
904 | if Present (Exception_Handlers (HSS)) then | |
905 | ||
906 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
907 | -- Probably by creating an actual N_Block_Statement. | |
908 | -- Probably in Expand. | |
909 | ||
910 | null; | |
911 | end if; | |
912 | end if; | |
913 | ||
9337aa0a AC |
914 | -- Mark the return object as referenced, since the return is an |
915 | -- implicit reference of the object. | |
916 | ||
917 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
918 | ||
ec4867fa | 919 | Check_References (Stm_Entity); |
de6cad7c AC |
920 | |
921 | -- Check RM 6.5 (5.9/3) | |
922 | ||
923 | if Has_Aliased then | |
924 | if Ada_Version < Ada_2012 then | |
dbfeb4fa RD |
925 | |
926 | -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? | |
927 | -- Can it really happen (extended return???) | |
928 | ||
929 | Error_Msg_N | |
b785e0b8 AC |
930 | ("aliased only allowed for limited return objects " |
931 | & "in Ada 2012??", N); | |
de6cad7c | 932 | |
51245e2d | 933 | elsif not Is_Limited_View (R_Type) then |
de6cad7c AC |
934 | Error_Msg_N ("aliased only allowed for limited" |
935 | & " return objects", N); | |
936 | end if; | |
937 | end if; | |
ec4867fa ES |
938 | end; |
939 | end if; | |
940 | ||
21d27997 | 941 | -- Case of Expr present |
5d37ba92 | 942 | |
ec4867fa | 943 | if Present (Expr) |
21d27997 | 944 | |
8fde064e | 945 | -- Defend against previous errors |
21d27997 RD |
946 | |
947 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 948 | and then Present (Etype (Expr)) |
ec4867fa | 949 | then |
5d37ba92 ES |
950 | -- Apply constraint check. Note that this is done before the implicit |
951 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 952 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
953 | -- with null-excluding expressions found in return statements. |
954 | ||
955 | Apply_Constraint_Check (Expr, R_Type); | |
956 | ||
957 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
958 | -- type, apply an implicit conversion of the expression to that type | |
959 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 960 | |
0791fbe9 | 961 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
962 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
963 | then | |
964 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
965 | Analyze_And_Resolve (Expr, R_Type); | |
b6b5cca8 AC |
966 | |
967 | -- If this is a local anonymous access to subprogram, the | |
968 | -- accessibility check can be applied statically. The return is | |
969 | -- illegal if the access type of the return expression is declared | |
970 | -- inside of the subprogram (except if it is the subtype indication | |
971 | -- of an extended return statement). | |
972 | ||
973 | elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then | |
974 | if not Comes_From_Source (Current_Scope) | |
975 | or else Ekind (Current_Scope) = E_Return_Statement | |
976 | then | |
977 | null; | |
978 | ||
979 | elsif | |
980 | Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) | |
981 | then | |
982 | Error_Msg_N ("cannot return local access to subprogram", N); | |
983 | end if; | |
1ebc2612 AC |
984 | |
985 | -- The expression cannot be of a formal incomplete type | |
986 | ||
987 | elsif Ekind (Etype (Expr)) = E_Incomplete_Type | |
988 | and then Is_Generic_Type (Etype (Expr)) | |
989 | then | |
990 | Error_Msg_N | |
991 | ("cannot return expression of a formal incomplete type", N); | |
ec4867fa ES |
992 | end if; |
993 | ||
21d27997 RD |
994 | -- If the result type is class-wide, then check that the return |
995 | -- expression's type is not declared at a deeper level than the | |
996 | -- function (RM05-6.5(5.6/2)). | |
997 | ||
0791fbe9 | 998 | if Ada_Version >= Ada_2005 |
21d27997 RD |
999 | and then Is_Class_Wide_Type (R_Type) |
1000 | then | |
1001 | if Type_Access_Level (Etype (Expr)) > | |
1002 | Subprogram_Access_Level (Scope_Id) | |
1003 | then | |
1004 | Error_Msg_N | |
1005 | ("level of return expression type is deeper than " & | |
1006 | "class-wide function!", Expr); | |
1007 | end if; | |
1008 | end if; | |
1009 | ||
4755cce9 JM |
1010 | -- Check incorrect use of dynamically tagged expression |
1011 | ||
1012 | if Is_Tagged_Type (R_Type) then | |
1013 | Check_Dynamically_Tagged_Expression | |
1014 | (Expr => Expr, | |
1015 | Typ => R_Type, | |
1016 | Related_Nod => N); | |
ec4867fa ES |
1017 | end if; |
1018 | ||
ec4867fa ES |
1019 | -- ??? A real run-time accessibility check is needed in cases |
1020 | -- involving dereferences of access parameters. For now we just | |
1021 | -- check the static cases. | |
1022 | ||
0791fbe9 | 1023 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
51245e2d | 1024 | and then Is_Limited_View (Etype (Scope_Id)) |
ec4867fa ES |
1025 | and then Object_Access_Level (Expr) > |
1026 | Subprogram_Access_Level (Scope_Id) | |
1027 | then | |
9694c039 AC |
1028 | -- Suppress the message in a generic, where the rewriting |
1029 | -- is irrelevant. | |
1030 | ||
1031 | if Inside_A_Generic then | |
1032 | null; | |
1033 | ||
1034 | else | |
1035 | Rewrite (N, | |
1036 | Make_Raise_Program_Error (Loc, | |
1037 | Reason => PE_Accessibility_Check_Failed)); | |
1038 | Analyze (N); | |
1039 | ||
43417b90 | 1040 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
1041 | Error_Msg_N ("cannot return a local value by reference<<", N); |
1042 | Error_Msg_NE ("\& [<<", N, Standard_Program_Error); | |
9694c039 | 1043 | end if; |
ec4867fa | 1044 | end if; |
5d37ba92 ES |
1045 | |
1046 | if Known_Null (Expr) | |
1047 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
1048 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
1049 | then | |
1050 | Apply_Compile_Time_Constraint_Error | |
1051 | (N => Expr, | |
1052 | Msg => "(Ada 2005) null not allowed for " | |
dbfeb4fa | 1053 | & "null-excluding return??", |
5d37ba92 ES |
1054 | Reason => CE_Null_Not_Allowed); |
1055 | end if; | |
ec4867fa ES |
1056 | end if; |
1057 | end Analyze_Function_Return; | |
1058 | ||
996ae0b0 RK |
1059 | ------------------------------------- |
1060 | -- Analyze_Generic_Subprogram_Body -- | |
1061 | ------------------------------------- | |
1062 | ||
1063 | procedure Analyze_Generic_Subprogram_Body | |
1064 | (N : Node_Id; | |
1065 | Gen_Id : Entity_Id) | |
1066 | is | |
fbf5a39b | 1067 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 1068 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 1069 | Body_Id : Entity_Id; |
996ae0b0 | 1070 | New_N : Node_Id; |
fbf5a39b | 1071 | Spec : Node_Id; |
996ae0b0 RK |
1072 | |
1073 | begin | |
82c80734 RD |
1074 | -- Copy body and disable expansion while analyzing the generic For a |
1075 | -- stub, do not copy the stub (which would load the proper body), this | |
1076 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
1077 | |
1078 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
1079 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
1080 | Rewrite (N, New_N); | |
1081 | Start_Generic; | |
1082 | end if; | |
1083 | ||
1084 | Spec := Specification (N); | |
1085 | ||
1086 | -- Within the body of the generic, the subprogram is callable, and | |
1087 | -- behaves like the corresponding non-generic unit. | |
1088 | ||
fbf5a39b | 1089 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
1090 | |
1091 | if Kind = E_Generic_Procedure | |
1092 | and then Nkind (Spec) /= N_Procedure_Specification | |
1093 | then | |
fbf5a39b | 1094 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
1095 | return; |
1096 | ||
1097 | elsif Kind = E_Generic_Function | |
1098 | and then Nkind (Spec) /= N_Function_Specification | |
1099 | then | |
fbf5a39b | 1100 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
1101 | return; |
1102 | end if; | |
1103 | ||
fbf5a39b | 1104 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
1105 | |
1106 | if Has_Completion (Gen_Id) | |
1107 | and then Nkind (Parent (N)) /= N_Subunit | |
1108 | then | |
1109 | Error_Msg_N ("duplicate generic body", N); | |
1110 | return; | |
1111 | else | |
1112 | Set_Has_Completion (Gen_Id); | |
1113 | end if; | |
1114 | ||
1115 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1116 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1117 | else | |
1118 | Set_Corresponding_Spec (N, Gen_Id); | |
1119 | end if; | |
1120 | ||
1121 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1122 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1123 | end if; | |
1124 | ||
1125 | -- Make generic parameters immediately visible in the body. They are | |
1126 | -- needed to process the formals declarations. Then make the formals | |
1127 | -- visible in a separate step. | |
1128 | ||
0a36105d | 1129 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1130 | |
1131 | declare | |
1132 | E : Entity_Id; | |
1133 | First_Ent : Entity_Id; | |
1134 | ||
1135 | begin | |
1136 | First_Ent := First_Entity (Gen_Id); | |
1137 | ||
1138 | E := First_Ent; | |
1139 | while Present (E) and then not Is_Formal (E) loop | |
1140 | Install_Entity (E); | |
1141 | Next_Entity (E); | |
1142 | end loop; | |
1143 | ||
1144 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1145 | ||
1146 | -- Now generic formals are visible, and the specification can be | |
1147 | -- analyzed, for subsequent conformance check. | |
1148 | ||
fbf5a39b | 1149 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1150 | |
fbf5a39b | 1151 | -- Make formal parameters visible |
996ae0b0 RK |
1152 | |
1153 | if Present (E) then | |
1154 | ||
fbf5a39b AC |
1155 | -- E is the first formal parameter, we loop through the formals |
1156 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1157 | |
1158 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1159 | while Present (E) loop |
1160 | Install_Entity (E); | |
1161 | Next_Formal (E); | |
1162 | end loop; | |
1163 | end if; | |
1164 | ||
e895b435 | 1165 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1166 | |
ec4867fa | 1167 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
ea3c0651 | 1168 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
ec4867fa ES |
1169 | Set_Ekind (Body_Id, E_Subprogram_Body); |
1170 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1171 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1172 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
fbf5a39b AC |
1173 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1174 | ||
1175 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1176 | ||
e895b435 | 1177 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1178 | |
1179 | Set_Ekind (Gen_Id, Kind); | |
1180 | Set_Ekind (Body_Id, Kind); | |
1181 | ||
1182 | if Present (First_Ent) then | |
1183 | Set_First_Entity (Gen_Id, First_Ent); | |
1184 | end if; | |
1185 | ||
1186 | End_Scope; | |
1187 | return; | |
1188 | end if; | |
996ae0b0 | 1189 | |
82c80734 RD |
1190 | -- If this is a compilation unit, it must be made visible explicitly, |
1191 | -- because the compilation of the declaration, unlike other library | |
1192 | -- unit declarations, does not. If it is not a unit, the following | |
1193 | -- is redundant but harmless. | |
996ae0b0 RK |
1194 | |
1195 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1196 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1197 | |
ec4867fa ES |
1198 | if Is_Child_Unit (Gen_Id) then |
1199 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1200 | end if; | |
1201 | ||
996ae0b0 | 1202 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 | 1203 | |
ea3c0651 AC |
1204 | -- Deal with [refined] preconditions, postconditions, Contract_Cases, |
1205 | -- invariants and predicates associated with the body and its spec. | |
1206 | -- Note that this is not pure expansion as Expand_Subprogram_Contract | |
1207 | -- prepares the contract assertions for generic subprograms or for | |
1208 | -- ASIS. Do not generate contract checks in SPARK mode. | |
483361a6 | 1209 | |
f5da7a97 | 1210 | if not GNATprove_Mode then |
ea3c0651 | 1211 | Expand_Subprogram_Contract (N, Gen_Id, Body_Id); |
483361a6 | 1212 | end if; |
0dabde3a ES |
1213 | |
1214 | -- If the generic unit carries pre- or post-conditions, copy them | |
1215 | -- to the original generic tree, so that they are properly added | |
1216 | -- to any instantiation. | |
1217 | ||
1218 | declare | |
1219 | Orig : constant Node_Id := Original_Node (N); | |
1220 | Cond : Node_Id; | |
1221 | ||
1222 | begin | |
1223 | Cond := First (Declarations (N)); | |
1224 | while Present (Cond) loop | |
1225 | if Nkind (Cond) = N_Pragma | |
1226 | and then Pragma_Name (Cond) = Name_Check | |
1227 | then | |
1228 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1229 | ||
1230 | elsif Nkind (Cond) = N_Pragma | |
1231 | and then Pragma_Name (Cond) = Name_Postcondition | |
1232 | then | |
1233 | Set_Ekind (Defining_Entity (Orig), Ekind (Gen_Id)); | |
1234 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1235 | else | |
1236 | exit; | |
1237 | end if; | |
1238 | ||
1239 | Next (Cond); | |
1240 | end loop; | |
1241 | end; | |
1242 | ||
cbee4f74 AC |
1243 | Check_SPARK_Mode_In_Generic (N); |
1244 | ||
579847c2 AC |
1245 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
1246 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
1247 | ||
996ae0b0 RK |
1248 | Analyze_Declarations (Declarations (N)); |
1249 | Check_Completion; | |
1250 | Analyze (Handled_Statement_Sequence (N)); | |
1251 | ||
1252 | Save_Global_References (Original_Node (N)); | |
1253 | ||
82c80734 RD |
1254 | -- Prior to exiting the scope, include generic formals again (if any |
1255 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1256 | |
1257 | if Present (First_Ent) then | |
1258 | Set_First_Entity (Gen_Id, First_Ent); | |
1259 | end if; | |
1260 | ||
fbf5a39b | 1261 | Check_References (Gen_Id); |
996ae0b0 RK |
1262 | end; |
1263 | ||
e6f69614 | 1264 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1265 | End_Scope; |
1266 | Check_Subprogram_Order (N); | |
1267 | ||
e895b435 | 1268 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1269 | |
1270 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1271 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1272 | |
1273 | if Style_Check then | |
1274 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1275 | end if; | |
13d923cc | 1276 | |
996ae0b0 | 1277 | End_Generic; |
996ae0b0 RK |
1278 | end Analyze_Generic_Subprogram_Body; |
1279 | ||
4d8f3296 ES |
1280 | ---------------------------- |
1281 | -- Analyze_Null_Procedure -- | |
1282 | ---------------------------- | |
1283 | ||
1284 | procedure Analyze_Null_Procedure | |
1285 | (N : Node_Id; | |
1286 | Is_Completion : out Boolean) | |
1287 | is | |
1288 | Loc : constant Source_Ptr := Sloc (N); | |
1289 | Spec : constant Node_Id := Specification (N); | |
1290 | Designator : Entity_Id; | |
1291 | Form : Node_Id; | |
1292 | Null_Body : Node_Id := Empty; | |
1293 | Prev : Entity_Id; | |
1294 | ||
1295 | begin | |
1296 | -- Capture the profile of the null procedure before analysis, for | |
1297 | -- expansion at the freeze point and at each point of call. The body is | |
1298 | -- used if the procedure has preconditions, or if it is a completion. In | |
1299 | -- the first case the body is analyzed at the freeze point, in the other | |
1300 | -- it replaces the null procedure declaration. | |
1301 | ||
1302 | Null_Body := | |
1303 | Make_Subprogram_Body (Loc, | |
1304 | Specification => New_Copy_Tree (Spec), | |
8c35b40a | 1305 | Declarations => New_List, |
4d8f3296 ES |
1306 | Handled_Statement_Sequence => |
1307 | Make_Handled_Sequence_Of_Statements (Loc, | |
1308 | Statements => New_List (Make_Null_Statement (Loc)))); | |
1309 | ||
1310 | -- Create new entities for body and formals | |
1311 | ||
1312 | Set_Defining_Unit_Name (Specification (Null_Body), | |
9d2a2071 AC |
1313 | Make_Defining_Identifier |
1314 | (Sloc (Defining_Entity (N)), | |
1315 | Chars (Defining_Entity (N)))); | |
4d8f3296 ES |
1316 | |
1317 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1318 | while Present (Form) loop | |
1319 | Set_Defining_Identifier (Form, | |
9d2a2071 AC |
1320 | Make_Defining_Identifier |
1321 | (Sloc (Defining_Identifier (Form)), | |
1322 | Chars (Defining_Identifier (Form)))); | |
4d8f3296 ES |
1323 | Next (Form); |
1324 | end loop; | |
1325 | ||
1326 | -- Determine whether the null procedure may be a completion of a generic | |
1327 | -- suprogram, in which case we use the new null body as the completion | |
1328 | -- and set minimal semantic information on the original declaration, | |
1329 | -- which is rewritten as a null statement. | |
1330 | ||
1331 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
1332 | ||
1333 | if Present (Prev) and then Is_Generic_Subprogram (Prev) then | |
1334 | Insert_Before (N, Null_Body); | |
1335 | Set_Ekind (Defining_Entity (N), Ekind (Prev)); | |
1336 | Set_Contract (Defining_Entity (N), Make_Contract (Loc)); | |
1337 | ||
1338 | Rewrite (N, Make_Null_Statement (Loc)); | |
1339 | Analyze_Generic_Subprogram_Body (Null_Body, Prev); | |
1340 | Is_Completion := True; | |
1341 | return; | |
1342 | ||
1343 | else | |
4d8f3296 ES |
1344 | -- Resolve the types of the formals now, because the freeze point |
1345 | -- may appear in a different context, e.g. an instantiation. | |
1346 | ||
1347 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1348 | while Present (Form) loop | |
1349 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
1350 | Find_Type (Parameter_Type (Form)); | |
1351 | ||
1352 | elsif | |
1353 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
1354 | then | |
1355 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
1356 | ||
1357 | else | |
1358 | -- The case of a null procedure with a formal that is an | |
1359 | -- access_to_subprogram type, and that is used as an actual | |
1360 | -- in an instantiation is left to the enthusiastic reader. | |
1361 | ||
1362 | null; | |
1363 | end if; | |
1364 | ||
1365 | Next (Form); | |
1366 | end loop; | |
1367 | end if; | |
1368 | ||
1369 | -- If there are previous overloadable entities with the same name, | |
1370 | -- check whether any of them is completed by the null procedure. | |
1371 | ||
1372 | if Present (Prev) and then Is_Overloadable (Prev) then | |
1373 | Designator := Analyze_Subprogram_Specification (Spec); | |
1374 | Prev := Find_Corresponding_Spec (N); | |
1375 | end if; | |
1376 | ||
1377 | if No (Prev) or else not Comes_From_Source (Prev) then | |
1378 | Designator := Analyze_Subprogram_Specification (Spec); | |
1379 | Set_Has_Completion (Designator); | |
1380 | ||
1381 | -- Signal to caller that this is a procedure declaration | |
1382 | ||
1383 | Is_Completion := False; | |
1384 | ||
1385 | -- Null procedures are always inlined, but generic formal subprograms | |
1386 | -- which appear as such in the internal instance of formal packages, | |
1387 | -- need no completion and are not marked Inline. | |
1388 | ||
1389 | if Expander_Active | |
1390 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
1391 | then | |
1392 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
1393 | Set_Body_To_Inline (N, Null_Body); | |
1394 | Set_Is_Inlined (Designator); | |
1395 | end if; | |
1396 | ||
1397 | else | |
2fe258bf AC |
1398 | -- The null procedure is a completion. We unconditionally rewrite |
1399 | -- this as a null body (even if expansion is not active), because | |
1400 | -- there are various error checks that are applied on this body | |
1401 | -- when it is analyzed (e.g. correct aspect placement). | |
4d8f3296 ES |
1402 | |
1403 | Is_Completion := True; | |
2fe258bf AC |
1404 | Rewrite (N, Null_Body); |
1405 | Analyze (N); | |
4d8f3296 ES |
1406 | end if; |
1407 | end Analyze_Null_Procedure; | |
1408 | ||
996ae0b0 RK |
1409 | ----------------------------- |
1410 | -- Analyze_Operator_Symbol -- | |
1411 | ----------------------------- | |
1412 | ||
82c80734 RD |
1413 | -- An operator symbol such as "+" or "and" may appear in context where the |
1414 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1415 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1416 | -- generates this node, and the semantics does the disambiguation. Other | |
1417 | -- such case are actuals in an instantiation, the generic unit in an | |
1418 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1419 | |
1420 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1421 | Par : constant Node_Id := Parent (N); | |
1422 | ||
1423 | begin | |
1f0b1e48 | 1424 | if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
996ae0b0 | 1425 | or else Nkind (Par) = N_Function_Instantiation |
1f0b1e48 | 1426 | or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
996ae0b0 | 1427 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1f0b1e48 | 1428 | and then not Is_Pragma_String_Literal (Par)) |
996ae0b0 | 1429 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
800621e0 RD |
1430 | or else (Nkind (Par) = N_Attribute_Reference |
1431 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1432 | then |
1433 | Find_Direct_Name (N); | |
1434 | ||
1435 | else | |
1436 | Change_Operator_Symbol_To_String_Literal (N); | |
1437 | Analyze (N); | |
1438 | end if; | |
1439 | end Analyze_Operator_Symbol; | |
1440 | ||
1441 | ----------------------------------- | |
1442 | -- Analyze_Parameter_Association -- | |
1443 | ----------------------------------- | |
1444 | ||
1445 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1446 | begin | |
1447 | Analyze (Explicit_Actual_Parameter (N)); | |
1448 | end Analyze_Parameter_Association; | |
1449 | ||
1450 | ---------------------------- | |
1451 | -- Analyze_Procedure_Call -- | |
1452 | ---------------------------- | |
1453 | ||
1454 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
1455 | Loc : constant Source_Ptr := Sloc (N); | |
1456 | P : constant Node_Id := Name (N); | |
1457 | Actuals : constant List_Id := Parameter_Associations (N); | |
1458 | Actual : Node_Id; | |
1459 | New_N : Node_Id; | |
1460 | ||
1461 | procedure Analyze_Call_And_Resolve; | |
1462 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1463 | -- At end, check illegal order dependence. |
996ae0b0 | 1464 | |
fbf5a39b AC |
1465 | ------------------------------ |
1466 | -- Analyze_Call_And_Resolve -- | |
1467 | ------------------------------ | |
1468 | ||
996ae0b0 RK |
1469 | procedure Analyze_Call_And_Resolve is |
1470 | begin | |
1471 | if Nkind (N) = N_Procedure_Call_Statement then | |
1472 | Analyze_Call (N); | |
1473 | Resolve (N, Standard_Void_Type); | |
1474 | else | |
1475 | Analyze (N); | |
1476 | end if; | |
1477 | end Analyze_Call_And_Resolve; | |
1478 | ||
1479 | -- Start of processing for Analyze_Procedure_Call | |
1480 | ||
1481 | begin | |
1482 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1483 | -- a procedure call or an entry call. The prefix may denote an access | |
1484 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1485 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1486 | -- then the construct denotes a call to a member of an entire family. |
1487 | -- If the prefix is a simple name, it may still denote a call to a | |
1488 | -- parameterless member of an entry family. Resolution of these various | |
1489 | -- interpretations is delicate. | |
1490 | ||
1491 | Analyze (P); | |
1492 | ||
758c442c GD |
1493 | -- If this is a call of the form Obj.Op, the call may have been |
1494 | -- analyzed and possibly rewritten into a block, in which case | |
1495 | -- we are done. | |
1496 | ||
1497 | if Analyzed (N) then | |
1498 | return; | |
1499 | end if; | |
1500 | ||
7415029d AC |
1501 | -- If there is an error analyzing the name (which may have been |
1502 | -- rewritten if the original call was in prefix notation) then error | |
1503 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1504 | |
21791d97 | 1505 | if Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
996ae0b0 RK |
1506 | Set_Etype (N, Any_Type); |
1507 | return; | |
1508 | end if; | |
1509 | ||
1510 | -- Otherwise analyze the parameters | |
1511 | ||
1512 | if Present (Actuals) then | |
1513 | Actual := First (Actuals); | |
1514 | ||
1515 | while Present (Actual) loop | |
1516 | Analyze (Actual); | |
1517 | Check_Parameterless_Call (Actual); | |
1518 | Next (Actual); | |
1519 | end loop; | |
1520 | end if; | |
1521 | ||
0bfc9a64 | 1522 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1523 | |
1524 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a AC |
1525 | and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
1526 | Name_Elab_Body, | |
1527 | Name_Elab_Subp_Body) | |
996ae0b0 RK |
1528 | then |
1529 | if Present (Actuals) then | |
1530 | Error_Msg_N | |
1531 | ("no parameters allowed for this call", First (Actuals)); | |
1532 | return; | |
1533 | end if; | |
1534 | ||
1535 | Set_Etype (N, Standard_Void_Type); | |
1536 | Set_Analyzed (N); | |
1537 | ||
1538 | elsif Is_Entity_Name (P) | |
1539 | and then Is_Record_Type (Etype (Entity (P))) | |
1540 | and then Remote_AST_I_Dereference (P) | |
1541 | then | |
1542 | return; | |
1543 | ||
1544 | elsif Is_Entity_Name (P) | |
1545 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1546 | then | |
1547 | if Is_Access_Type (Etype (P)) | |
1548 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1549 | and then No (Actuals) | |
1550 | and then Comes_From_Source (N) | |
1551 | then | |
ed2233dc | 1552 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1553 | end if; |
1554 | ||
1555 | Analyze_Call_And_Resolve; | |
1556 | ||
1557 | -- If the prefix is the simple name of an entry family, this is | |
1558 | -- a parameterless call from within the task body itself. | |
1559 | ||
1560 | elsif Is_Entity_Name (P) | |
1561 | and then Nkind (P) = N_Identifier | |
1562 | and then Ekind (Entity (P)) = E_Entry_Family | |
1563 | and then Present (Actuals) | |
1564 | and then No (Next (First (Actuals))) | |
1565 | then | |
82c80734 RD |
1566 | -- Can be call to parameterless entry family. What appears to be the |
1567 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1568 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1569 | -- transformation. |
1570 | ||
1571 | New_N := | |
1572 | Make_Indexed_Component (Loc, | |
1573 | Prefix => | |
1574 | Make_Selected_Component (Loc, | |
1575 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1576 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1577 | Expressions => Actuals); | |
1578 | Set_Name (N, New_N); | |
1579 | Set_Etype (New_N, Standard_Void_Type); | |
1580 | Set_Parameter_Associations (N, No_List); | |
1581 | Analyze_Call_And_Resolve; | |
1582 | ||
1583 | elsif Nkind (P) = N_Explicit_Dereference then | |
1584 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1585 | Analyze_Call_And_Resolve; | |
1586 | else | |
1587 | Error_Msg_N ("expect access to procedure in call", P); | |
1588 | end if; | |
1589 | ||
82c80734 RD |
1590 | -- The name can be a selected component or an indexed component that |
1591 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1592 | -- has parameter associations. | |
996ae0b0 RK |
1593 | |
1594 | elsif Is_Access_Type (Etype (P)) | |
1595 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1596 | then | |
1597 | if Present (Actuals) then | |
1598 | Analyze_Call_And_Resolve; | |
1599 | else | |
ed2233dc | 1600 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1601 | end if; |
1602 | ||
82c80734 RD |
1603 | -- If not an access to subprogram, then the prefix must resolve to the |
1604 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1605 | |
82c80734 RD |
1606 | -- For the case of a simple entry call, P is a selected component where |
1607 | -- the prefix is the task and the selector name is the entry. A call to | |
1608 | -- a protected procedure will have the same syntax. If the protected | |
1609 | -- object contains overloaded operations, the entity may appear as a | |
1610 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1611 | |
1612 | elsif Nkind (P) = N_Selected_Component | |
8fde064e AC |
1613 | and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
1614 | E_Procedure, | |
1615 | E_Function) | |
996ae0b0 RK |
1616 | then |
1617 | Analyze_Call_And_Resolve; | |
1618 | ||
1619 | elsif Nkind (P) = N_Selected_Component | |
1620 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1621 | and then Present (Actuals) | |
1622 | and then No (Next (First (Actuals))) | |
1623 | then | |
82c80734 RD |
1624 | -- Can be call to parameterless entry family. What appears to be the |
1625 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1626 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1627 | -- transformation. |
1628 | ||
1629 | New_N := | |
1630 | Make_Indexed_Component (Loc, | |
1631 | Prefix => New_Copy (P), | |
1632 | Expressions => Actuals); | |
1633 | Set_Name (N, New_N); | |
1634 | Set_Etype (New_N, Standard_Void_Type); | |
1635 | Set_Parameter_Associations (N, No_List); | |
1636 | Analyze_Call_And_Resolve; | |
1637 | ||
1638 | -- For the case of a reference to an element of an entry family, P is | |
1639 | -- an indexed component whose prefix is a selected component (task and | |
1640 | -- entry family), and whose index is the entry family index. | |
1641 | ||
1642 | elsif Nkind (P) = N_Indexed_Component | |
1643 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1644 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1645 | then | |
1646 | Analyze_Call_And_Resolve; | |
1647 | ||
1648 | -- If the prefix is the name of an entry family, it is a call from | |
1649 | -- within the task body itself. | |
1650 | ||
1651 | elsif Nkind (P) = N_Indexed_Component | |
1652 | and then Nkind (Prefix (P)) = N_Identifier | |
1653 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1654 | then | |
1655 | New_N := | |
1656 | Make_Selected_Component (Loc, | |
1657 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1658 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1659 | Rewrite (Prefix (P), New_N); | |
1660 | Analyze (P); | |
1661 | Analyze_Call_And_Resolve; | |
1662 | ||
9f8d1e5c AC |
1663 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
1664 | -- procedure name, so the construct can only be a qualified expression. | |
1665 | ||
1666 | elsif Nkind (P) = N_Qualified_Expression | |
1667 | and then Ada_Version >= Ada_2012 | |
1668 | then | |
1669 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
1670 | Analyze (N); | |
1671 | ||
e895b435 | 1672 | -- Anything else is an error |
996ae0b0 RK |
1673 | |
1674 | else | |
758c442c | 1675 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 RK |
1676 | end if; |
1677 | end Analyze_Procedure_Call; | |
1678 | ||
b0186f71 AC |
1679 | ------------------------------ |
1680 | -- Analyze_Return_Statement -- | |
1681 | ------------------------------ | |
1682 | ||
1683 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1684 | ||
1685 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1686 | N_Extended_Return_Statement)); | |
1687 | ||
1688 | Returns_Object : constant Boolean := | |
1689 | Nkind (N) = N_Extended_Return_Statement | |
1690 | or else | |
8fde064e AC |
1691 | (Nkind (N) = N_Simple_Return_Statement |
1692 | and then Present (Expression (N))); | |
b0186f71 AC |
1693 | -- True if we're returning something; that is, "return <expression>;" |
1694 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1695 | -- checking: If Returns_Object is True, N should apply to a function | |
1696 | -- body; otherwise N should apply to a procedure body, entry body, | |
1697 | -- accept statement, or extended return statement. | |
1698 | ||
1699 | function Find_What_It_Applies_To return Entity_Id; | |
1700 | -- Find the entity representing the innermost enclosing body, accept | |
1701 | -- statement, or extended return statement. If the result is a callable | |
1702 | -- construct or extended return statement, then this will be the value | |
1703 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1704 | -- illegal. See RM-6.5(4/2). | |
1705 | ||
1706 | ----------------------------- | |
1707 | -- Find_What_It_Applies_To -- | |
1708 | ----------------------------- | |
1709 | ||
1710 | function Find_What_It_Applies_To return Entity_Id is | |
1711 | Result : Entity_Id := Empty; | |
1712 | ||
1713 | begin | |
36b8f95f AC |
1714 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1715 | -- and postconditions. | |
b0186f71 AC |
1716 | |
1717 | for J in reverse 0 .. Scope_Stack.Last loop | |
1718 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1719 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1720 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1721 | end loop; |
1722 | ||
1723 | pragma Assert (Present (Result)); | |
1724 | return Result; | |
1725 | end Find_What_It_Applies_To; | |
1726 | ||
1727 | -- Local declarations | |
1728 | ||
1729 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1730 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1731 | Loc : constant Source_Ptr := Sloc (N); | |
1732 | Stm_Entity : constant Entity_Id := | |
1733 | New_Internal_Entity | |
1734 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1735 | ||
1736 | -- Start of processing for Analyze_Return_Statement | |
1737 | ||
1738 | begin | |
1739 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1740 | ||
1741 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1742 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1743 | ||
1744 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1745 | -- (4/2): an inner return statement will apply to this extended return. | |
1746 | ||
1747 | if Nkind (N) = N_Extended_Return_Statement then | |
1748 | Push_Scope (Stm_Entity); | |
1749 | end if; | |
1750 | ||
1751 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1752 | -- implicitly-generated return that is placed at the end. | |
1753 | ||
1754 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1755 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1756 | end if; | |
1757 | ||
1758 | -- Warn on any unassigned OUT parameters if in procedure | |
1759 | ||
1760 | if Ekind (Scope_Id) = E_Procedure then | |
1761 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1762 | end if; | |
1763 | ||
1764 | -- Check that functions return objects, and other things do not | |
1765 | ||
1766 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1767 | if not Returns_Object then | |
1768 | Error_Msg_N ("missing expression in return from function", N); | |
1769 | end if; | |
1770 | ||
1771 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1772 | if Returns_Object then | |
1773 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1774 | end if; | |
1775 | ||
1776 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1777 | if Returns_Object then | |
1778 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1779 | Error_Msg_N ("entry body cannot return value", N); | |
1780 | else | |
1781 | Error_Msg_N ("accept statement cannot return value", N); | |
1782 | end if; | |
1783 | end if; | |
1784 | ||
1785 | elsif Kind = E_Return_Statement then | |
1786 | ||
1787 | -- We are nested within another return statement, which must be an | |
1788 | -- extended_return_statement. | |
1789 | ||
1790 | if Returns_Object then | |
d0dcb2b1 AC |
1791 | if Nkind (N) = N_Extended_Return_Statement then |
1792 | Error_Msg_N | |
cc96a1b8 | 1793 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
1794 | N); |
1795 | ||
1796 | -- Case of a simple return statement with a value inside extended | |
1797 | -- return statement. | |
1798 | ||
1799 | else | |
1800 | Error_Msg_N | |
1801 | ("return nested in extended return statement cannot return " & | |
cc96a1b8 | 1802 | "value (use `RETURN;`)", N); |
d0dcb2b1 | 1803 | end if; |
b0186f71 AC |
1804 | end if; |
1805 | ||
1806 | else | |
1807 | Error_Msg_N ("illegal context for return statement", N); | |
1808 | end if; | |
1809 | ||
1810 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1811 | Analyze_Function_Return (N); | |
1812 | ||
1813 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1814 | Set_Return_Present (Scope_Id); | |
1815 | end if; | |
1816 | ||
1817 | if Nkind (N) = N_Extended_Return_Statement then | |
1818 | End_Scope; | |
1819 | end if; | |
1820 | ||
1821 | Kill_Current_Values (Last_Assignment_Only => True); | |
1822 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
1823 | |
1824 | Analyze_Dimension (N); | |
b0186f71 AC |
1825 | end Analyze_Return_Statement; |
1826 | ||
5d37ba92 ES |
1827 | ------------------------------------- |
1828 | -- Analyze_Simple_Return_Statement -- | |
1829 | ------------------------------------- | |
ec4867fa | 1830 | |
5d37ba92 | 1831 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1832 | begin |
5d37ba92 ES |
1833 | if Present (Expression (N)) then |
1834 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1835 | end if; |
1836 | ||
5d37ba92 ES |
1837 | Analyze_Return_Statement (N); |
1838 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1839 | |
82c80734 RD |
1840 | ------------------------- |
1841 | -- Analyze_Return_Type -- | |
1842 | ------------------------- | |
1843 | ||
1844 | procedure Analyze_Return_Type (N : Node_Id) is | |
1845 | Designator : constant Entity_Id := Defining_Entity (N); | |
1846 | Typ : Entity_Id := Empty; | |
1847 | ||
1848 | begin | |
ec4867fa ES |
1849 | -- Normal case where result definition does not indicate an error |
1850 | ||
41251c60 JM |
1851 | if Result_Definition (N) /= Error then |
1852 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
2ba431e5 | 1853 | Check_SPARK_Restriction |
fe5d3068 | 1854 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1855 | |
b1c11e0e JM |
1856 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1857 | ||
1858 | declare | |
1859 | AD : constant Node_Id := | |
1860 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1861 | begin | |
1862 | if Present (AD) and then Protected_Present (AD) then | |
1863 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1864 | else | |
1865 | Typ := Access_Definition (N, Result_Definition (N)); | |
1866 | end if; | |
1867 | end; | |
1868 | ||
41251c60 JM |
1869 | Set_Parent (Typ, Result_Definition (N)); |
1870 | Set_Is_Local_Anonymous_Access (Typ); | |
1871 | Set_Etype (Designator, Typ); | |
1872 | ||
b66c3ff4 AC |
1873 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1874 | ||
1875 | Null_Exclusion_Static_Checks (N); | |
1876 | ||
41251c60 JM |
1877 | -- Subtype_Mark case |
1878 | ||
1879 | else | |
1880 | Find_Type (Result_Definition (N)); | |
1881 | Typ := Entity (Result_Definition (N)); | |
1882 | Set_Etype (Designator, Typ); | |
1883 | ||
2ba431e5 | 1884 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1885 | |
8fde064e | 1886 | if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
2ba431e5 | 1887 | Check_SPARK_Restriction |
fe5d3068 | 1888 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1889 | Result_Definition (N)); |
daec8eeb YM |
1890 | end if; |
1891 | ||
b66c3ff4 AC |
1892 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1893 | ||
1894 | Null_Exclusion_Static_Checks (N); | |
1895 | ||
1896 | -- If a null exclusion is imposed on the result type, then create | |
1897 | -- a null-excluding itype (an access subtype) and use it as the | |
1898 | -- function's Etype. Note that the null exclusion checks are done | |
1899 | -- right before this, because they don't get applied to types that | |
1900 | -- do not come from source. | |
1901 | ||
8fde064e | 1902 | if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
b66c3ff4 AC |
1903 | Set_Etype (Designator, |
1904 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
1905 | (T => Typ, |
1906 | Related_Nod => N, | |
1907 | Scope_Id => Scope (Current_Scope))); | |
1908 | ||
1909 | -- The new subtype must be elaborated before use because | |
1910 | -- it is visible outside of the function. However its base | |
1911 | -- type may not be frozen yet, so the reference that will | |
1912 | -- force elaboration must be attached to the freezing of | |
1913 | -- the base type. | |
1914 | ||
212863c0 AC |
1915 | -- If the return specification appears on a proper body, |
1916 | -- the subtype will have been created already on the spec. | |
1917 | ||
ff7139c3 | 1918 | if Is_Frozen (Typ) then |
212863c0 AC |
1919 | if Nkind (Parent (N)) = N_Subprogram_Body |
1920 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
1921 | then | |
1922 | null; | |
1923 | else | |
1924 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
1925 | end if; | |
1926 | ||
ff7139c3 AC |
1927 | else |
1928 | Ensure_Freeze_Node (Typ); | |
1929 | ||
1930 | declare | |
212863c0 | 1931 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
1932 | begin |
1933 | Set_Itype (IR, Etype (Designator)); | |
1934 | Append_Freeze_Actions (Typ, New_List (IR)); | |
1935 | end; | |
1936 | end if; | |
1937 | ||
b66c3ff4 AC |
1938 | else |
1939 | Set_Etype (Designator, Typ); | |
1940 | end if; | |
1941 | ||
41251c60 | 1942 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
1943 | and then Is_Value_Type (Typ) |
1944 | then | |
1945 | null; | |
1946 | ||
1947 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 | 1948 | or else (Is_Class_Wide_Type (Typ) |
8fde064e | 1949 | and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
41251c60 | 1950 | then |
dd386db0 AC |
1951 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
1952 | -- parts. Untagged incomplete types are not allowed in bodies. | |
b973629e AC |
1953 | -- As a consequence, limited views cannot appear in a basic |
1954 | -- declaration that is itself within a body, because there is | |
1955 | -- no point at which the non-limited view will become visible. | |
dd386db0 AC |
1956 | |
1957 | if Ada_Version >= Ada_2012 then | |
b973629e AC |
1958 | if From_Limited_With (Typ) and then In_Package_Body then |
1959 | Error_Msg_NE | |
1960 | ("invalid use of incomplete type&", | |
3f80a182 | 1961 | Result_Definition (N), Typ); |
b973629e | 1962 | |
1ebc2612 AC |
1963 | -- The return type of a subprogram body cannot be of a |
1964 | -- formal incomplete type. | |
1965 | ||
1966 | elsif Is_Generic_Type (Typ) | |
1967 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
1968 | then | |
1969 | Error_Msg_N | |
1970 | ("return type cannot be a formal incomplete type", | |
1971 | Result_Definition (N)); | |
1972 | ||
1973 | elsif Is_Class_Wide_Type (Typ) | |
1974 | and then Is_Generic_Type (Root_Type (Typ)) | |
1975 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
1976 | then | |
1977 | Error_Msg_N | |
1978 | ("return type cannot be a formal incomplete type", | |
1979 | Result_Definition (N)); | |
1980 | ||
b973629e | 1981 | elsif Is_Tagged_Type (Typ) then |
dd386db0 AC |
1982 | null; |
1983 | ||
5b6f12c7 | 1984 | elsif Nkind (Parent (N)) = N_Subprogram_Body |
31d922e3 AC |
1985 | or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
1986 | N_Entry_Body) | |
dd386db0 AC |
1987 | then |
1988 | Error_Msg_NE | |
1989 | ("invalid use of untagged incomplete type&", | |
1990 | Designator, Typ); | |
1991 | end if; | |
1992 | ||
63be2a5a | 1993 | -- The type must be completed in the current package. This |
31d922e3 | 1994 | -- is checked at the end of the package declaration when |
7b7a0c2b AC |
1995 | -- Taft-amendment types are identified. If the return type |
1996 | -- is class-wide, there is no required check, the type can | |
1997 | -- be a bona fide TAT. | |
63be2a5a AC |
1998 | |
1999 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 2000 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 2001 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
2002 | then |
2003 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
2004 | end if; | |
2005 | ||
dd386db0 AC |
2006 | else |
2007 | Error_Msg_NE | |
2008 | ("invalid use of incomplete type&", Designator, Typ); | |
2009 | end if; | |
41251c60 | 2010 | end if; |
82c80734 RD |
2011 | end if; |
2012 | ||
ec4867fa ES |
2013 | -- Case where result definition does indicate an error |
2014 | ||
82c80734 RD |
2015 | else |
2016 | Set_Etype (Designator, Any_Type); | |
2017 | end if; | |
2018 | end Analyze_Return_Type; | |
2019 | ||
996ae0b0 RK |
2020 | ----------------------------- |
2021 | -- Analyze_Subprogram_Body -- | |
2022 | ----------------------------- | |
2023 | ||
b1b543d2 BD |
2024 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
2025 | Loc : constant Source_Ptr := Sloc (N); | |
2026 | Body_Spec : constant Node_Id := Specification (N); | |
2027 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
2028 | ||
2029 | begin | |
2030 | if Debug_Flag_C then | |
2031 | Write_Str ("==> subprogram body "); | |
2032 | Write_Name (Chars (Body_Id)); | |
2033 | Write_Str (" from "); | |
2034 | Write_Location (Loc); | |
2035 | Write_Eol; | |
2036 | Indent; | |
2037 | end if; | |
2038 | ||
2039 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
2040 | ||
2041 | -- The real work is split out into the helper, so it can do "return;" | |
2042 | -- without skipping the debug output: | |
2043 | ||
2044 | Analyze_Subprogram_Body_Helper (N); | |
2045 | ||
2046 | if Debug_Flag_C then | |
2047 | Outdent; | |
2048 | Write_Str ("<== subprogram body "); | |
2049 | Write_Name (Chars (Body_Id)); | |
2050 | Write_Str (" from "); | |
2051 | Write_Location (Loc); | |
2052 | Write_Eol; | |
2053 | end if; | |
2054 | end Analyze_Subprogram_Body; | |
2055 | ||
ea3c0651 AC |
2056 | -------------------------------------- |
2057 | -- Analyze_Subprogram_Body_Contract -- | |
2058 | -------------------------------------- | |
2059 | ||
ab8843fa | 2060 | procedure Analyze_Subprogram_Body_Contract (Body_Id : Entity_Id) is |
2c8d828a | 2061 | Body_Decl : constant Node_Id := Parent (Parent (Body_Id)); |
c61ef416 | 2062 | Mode : SPARK_Mode_Type; |
54e28df2 HK |
2063 | Prag : Node_Id; |
2064 | Ref_Depends : Node_Id := Empty; | |
2065 | Ref_Global : Node_Id := Empty; | |
2c8d828a | 2066 | Spec_Id : Entity_Id; |
ea3c0651 | 2067 | |
ea3c0651 | 2068 | begin |
fc999c5d RD |
2069 | -- Due to the timing of contract analysis, delayed pragmas may be |
2070 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
2071 | -- context. To remedy this, restore the original SPARK_Mode of the | |
2072 | -- related subprogram body. | |
2073 | ||
c61ef416 AC |
2074 | Save_SPARK_Mode_And_Set (Body_Id, Mode); |
2075 | ||
77a40ec1 AC |
2076 | -- When a subprogram body declaration is illegal, its defining entity is |
2077 | -- left unanalyzed. There is nothing left to do in this case because the | |
dda38714 | 2078 | -- body lacks a contract, or even a proper Ekind. |
ab8843fa | 2079 | |
dda38714 | 2080 | if Ekind (Body_Id) = E_Void then |
ab8843fa HK |
2081 | return; |
2082 | end if; | |
2083 | ||
2c8d828a AC |
2084 | if Nkind (Body_Decl) = N_Subprogram_Body_Stub then |
2085 | Spec_Id := Corresponding_Spec_Of_Stub (Body_Decl); | |
2086 | else | |
2087 | Spec_Id := Corresponding_Spec (Body_Decl); | |
2088 | end if; | |
2089 | ||
54e28df2 HK |
2090 | -- Locate and store pragmas Refined_Depends and Refined_Global since |
2091 | -- their order of analysis matters. | |
2092 | ||
ab8843fa HK |
2093 | Prag := Classifications (Contract (Body_Id)); |
2094 | while Present (Prag) loop | |
2095 | if Pragma_Name (Prag) = Name_Refined_Depends then | |
54e28df2 | 2096 | Ref_Depends := Prag; |
ab8843fa | 2097 | elsif Pragma_Name (Prag) = Name_Refined_Global then |
54e28df2 | 2098 | Ref_Global := Prag; |
ab8843fa HK |
2099 | end if; |
2100 | ||
2101 | Prag := Next_Pragma (Prag); | |
2102 | end loop; | |
2103 | ||
54e28df2 HK |
2104 | -- Analyze Refined_Global first as Refined_Depends may mention items |
2105 | -- classified in the global refinement. | |
2106 | ||
2107 | if Present (Ref_Global) then | |
2108 | Analyze_Refined_Global_In_Decl_Part (Ref_Global); | |
2109 | ||
ab8843fa | 2110 | -- When the corresponding Global aspect/pragma references a state with |
2dade097 HK |
2111 | -- visible refinement, the body requires Refined_Global. Refinement is |
2112 | -- not required when SPARK checks are suppressed. | |
ab8843fa | 2113 | |
54e28df2 | 2114 | elsif Present (Spec_Id) then |
ab8843fa HK |
2115 | Prag := Get_Pragma (Spec_Id, Pragma_Global); |
2116 | ||
2dade097 HK |
2117 | if SPARK_Mode /= Off |
2118 | and then Present (Prag) | |
2119 | and then Contains_Refined_State (Prag) | |
2120 | then | |
ab8843fa HK |
2121 | Error_Msg_NE |
2122 | ("body of subprogram & requires global refinement", | |
2123 | Body_Decl, Spec_Id); | |
2124 | end if; | |
2125 | end if; | |
54e28df2 HK |
2126 | |
2127 | -- Refined_Depends must be analyzed after Refined_Global in order to see | |
2128 | -- the modes of all global refinements. | |
2129 | ||
2130 | if Present (Ref_Depends) then | |
2131 | Analyze_Refined_Depends_In_Decl_Part (Ref_Depends); | |
39d3009f AC |
2132 | |
2133 | -- When the corresponding Depends aspect/pragma references a state with | |
2dade097 HK |
2134 | -- visible refinement, the body requires Refined_Depends. Refinement is |
2135 | -- not required when SPARK checks are suppressed. | |
39d3009f AC |
2136 | |
2137 | elsif Present (Spec_Id) then | |
2138 | Prag := Get_Pragma (Spec_Id, Pragma_Depends); | |
2139 | ||
2dade097 HK |
2140 | if SPARK_Mode /= Off |
2141 | and then Present (Prag) | |
2142 | and then Contains_Refined_State (Prag) | |
2143 | then | |
39d3009f AC |
2144 | Error_Msg_NE |
2145 | ("body of subprogram & requires dependance refinement", | |
2146 | Body_Decl, Spec_Id); | |
2147 | end if; | |
54e28df2 | 2148 | end if; |
c61ef416 | 2149 | |
fc999c5d RD |
2150 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
2151 | -- pragmas have been analyzed. | |
2152 | ||
c61ef416 | 2153 | Restore_SPARK_Mode (Mode); |
ea3c0651 AC |
2154 | end Analyze_Subprogram_Body_Contract; |
2155 | ||
b1b543d2 BD |
2156 | ------------------------------------ |
2157 | -- Analyze_Subprogram_Body_Helper -- | |
2158 | ------------------------------------ | |
2159 | ||
996ae0b0 RK |
2160 | -- This procedure is called for regular subprogram bodies, generic bodies, |
2161 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
2162 | -- specification matters, and is used to create a proper declaration for | |
2163 | -- the subprogram, or to perform conformance checks. | |
2164 | ||
b1b543d2 | 2165 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b AC |
2166 | Loc : constant Source_Ptr := Sloc (N); |
2167 | Body_Spec : constant Node_Id := Specification (N); | |
2168 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
2169 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 2170 | Conformant : Boolean; |
21d27997 | 2171 | HSS : Node_Id; |
21d27997 RD |
2172 | Prot_Typ : Entity_Id := Empty; |
2173 | Spec_Id : Entity_Id; | |
2174 | Spec_Decl : Node_Id := Empty; | |
2175 | ||
2176 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
2177 | -- When we analyze a separate spec, the entity chain ends up containing | |
2178 | -- the formals, as well as any itypes generated during analysis of the | |
2179 | -- default expressions for parameters, or the arguments of associated | |
2180 | -- precondition/postcondition pragmas (which are analyzed in the context | |
2181 | -- of the spec since they have visibility on formals). | |
2182 | -- | |
2183 | -- These entities belong with the spec and not the body. However we do | |
2184 | -- the analysis of the body in the context of the spec (again to obtain | |
2185 | -- visibility to the formals), and all the entities generated during | |
2186 | -- this analysis end up also chained to the entity chain of the spec. | |
2187 | -- But they really belong to the body, and there is circuitry to move | |
2188 | -- them from the spec to the body. | |
2189 | -- | |
2190 | -- However, when we do this move, we don't want to move the real spec | |
2191 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
2192 | -- variable points to the last real spec entity, so we only move those | |
2193 | -- chained beyond that point. It is initialized to Empty to deal with | |
2194 | -- the case where there is no separate spec. | |
996ae0b0 | 2195 | |
c8a3028c AC |
2196 | procedure Analyze_Aspects_On_Body_Or_Stub; |
2197 | -- Analyze the aspect specifications of a subprogram body [stub]. It is | |
2198 | -- assumed that N has aspects. | |
2199 | ||
ac072cb2 AC |
2200 | function Body_Has_Contract return Boolean; |
2201 | -- Check whether unanalyzed body has an aspect or pragma that may | |
1399d355 | 2202 | -- generate a SPARK contract. |
ac072cb2 | 2203 | |
ec4867fa | 2204 | procedure Check_Anonymous_Return; |
e50e1c5e | 2205 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
2206 | -- or a type that contains tasks, we must create a master entity for |
2207 | -- the anonymous type, which typically will be used in an allocator | |
2208 | -- in the body of the function. | |
2209 | ||
e660dbf7 JM |
2210 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
2211 | -- Look ahead to recognize a pragma that may appear after the body. | |
2212 | -- If there is a previous spec, check that it appears in the same | |
2213 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
2214 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
2215 | -- If the body acts as a spec, and inlining is required, we create a | |
2216 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
2217 | -- If pragma does not appear after the body, check whether there is |
2218 | -- an inline pragma before any local declarations. | |
c37bb106 | 2219 | |
7665e4bd AC |
2220 | procedure Check_Missing_Return; |
2221 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
2222 | -- the warning checks implemented by Check_Returns. In formal mode, also |
2223 | -- verify that a function ends with a RETURN and that a procedure does | |
2224 | -- not contain any RETURN. | |
7665e4bd | 2225 | |
d44202ba HK |
2226 | function Disambiguate_Spec return Entity_Id; |
2227 | -- When a primitive is declared between the private view and the full | |
2228 | -- view of a concurrent type which implements an interface, a special | |
2229 | -- mechanism is used to find the corresponding spec of the primitive | |
2230 | -- body. | |
2231 | ||
5dcab3ca AC |
2232 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id); |
2233 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains | |
2234 | -- incomplete types coming from a limited context and swap their limited | |
2235 | -- views with the non-limited ones. | |
2236 | ||
d44202ba HK |
2237 | function Is_Private_Concurrent_Primitive |
2238 | (Subp_Id : Entity_Id) return Boolean; | |
2239 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
2240 | -- type that implements an interface and has a private view. | |
2241 | ||
76a69663 ES |
2242 | procedure Set_Trivial_Subprogram (N : Node_Id); |
2243 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
2244 | -- subprogram whose body is being analyzed. N is the statement node | |
2245 | -- causing the flag to be set, if the following statement is a return | |
2246 | -- of an entity, we mark the entity as set in source to suppress any | |
2247 | -- warning on the stylized use of function stubs with a dummy return. | |
2248 | ||
758c442c GD |
2249 | procedure Verify_Overriding_Indicator; |
2250 | -- If there was a previous spec, the entity has been entered in the | |
2251 | -- current scope previously. If the body itself carries an overriding | |
2252 | -- indicator, check that it is consistent with the known status of the | |
2253 | -- entity. | |
2254 | ||
c8a3028c AC |
2255 | ------------------------------------- |
2256 | -- Analyze_Aspects_On_Body_Or_Stub -- | |
2257 | ------------------------------------- | |
2258 | ||
2259 | procedure Analyze_Aspects_On_Body_Or_Stub is | |
2260 | procedure Diagnose_Misplaced_Aspects; | |
2261 | -- Subprogram body [stub] N has aspects, but they are not properly | |
2262 | -- placed. Provide precise diagnostics depending on the aspects | |
2263 | -- involved. | |
2264 | ||
2265 | -------------------------------- | |
2266 | -- Diagnose_Misplaced_Aspects -- | |
2267 | -------------------------------- | |
2268 | ||
2269 | procedure Diagnose_Misplaced_Aspects is | |
2270 | Asp : Node_Id; | |
2271 | Asp_Nam : Name_Id; | |
2272 | Asp_Id : Aspect_Id; | |
2273 | -- The current aspect along with its name and id | |
2274 | ||
2275 | procedure SPARK_Aspect_Error (Ref_Nam : Name_Id); | |
2276 | -- Emit an error message concerning SPARK aspect Asp. Ref_Nam is | |
2277 | -- the name of the refined version of the aspect. | |
2278 | ||
2279 | ------------------------ | |
2280 | -- SPARK_Aspect_Error -- | |
2281 | ------------------------ | |
2282 | ||
2283 | procedure SPARK_Aspect_Error (Ref_Nam : Name_Id) is | |
2284 | begin | |
2285 | -- The corresponding spec already contains the aspect in | |
2286 | -- question and the one appearing on the body must be the | |
2287 | -- refined form: | |
2288 | ||
2289 | -- procedure P with Global ...; | |
2290 | -- procedure P with Global ... is ... end P; | |
2291 | -- ^ | |
2292 | -- Refined_Global | |
2293 | ||
2294 | if Has_Aspect (Spec_Id, Asp_Id) then | |
2295 | Error_Msg_Name_1 := Asp_Nam; | |
2296 | ||
2297 | -- Subunits cannot carry aspects that apply to a subprogram | |
2298 | -- declaration. | |
2299 | ||
2300 | if Nkind (Parent (N)) = N_Subunit then | |
2301 | Error_Msg_N ("aspect % cannot apply to a subunit", Asp); | |
2302 | ||
2303 | else | |
2304 | Error_Msg_Name_2 := Ref_Nam; | |
2305 | Error_Msg_N ("aspect % should be %", Asp); | |
2306 | end if; | |
2307 | ||
2308 | -- Otherwise the aspect must appear in the spec, not in the | |
2309 | -- body: | |
2310 | ||
2311 | -- procedure P; | |
2312 | -- procedure P with Global ... is ... end P; | |
2313 | ||
2314 | else | |
2315 | Error_Msg_N | |
2316 | ("aspect specification must appear in subprogram " | |
2317 | & "declaration", Asp); | |
2318 | end if; | |
2319 | end SPARK_Aspect_Error; | |
2320 | ||
2321 | -- Start of processing for Diagnose_Misplaced_Aspects | |
2322 | ||
2323 | begin | |
2324 | -- Iterate over the aspect specifications and emit specific errors | |
2325 | -- where applicable. | |
2326 | ||
2327 | Asp := First (Aspect_Specifications (N)); | |
2328 | while Present (Asp) loop | |
2329 | Asp_Nam := Chars (Identifier (Asp)); | |
2330 | Asp_Id := Get_Aspect_Id (Asp_Nam); | |
2331 | ||
2332 | -- Do not emit errors on aspects that can appear on a | |
2333 | -- subprogram body. This scenario occurs when the aspect | |
2334 | -- specification list contains both misplaced and properly | |
2335 | -- placed aspects. | |
2336 | ||
2337 | if Aspect_On_Body_Or_Stub_OK (Asp_Id) then | |
2338 | null; | |
2339 | ||
2340 | -- Special diagnostics for SPARK aspects | |
2341 | ||
2342 | elsif Asp_Nam = Name_Depends then | |
2343 | SPARK_Aspect_Error (Name_Refined_Depends); | |
2344 | ||
2345 | elsif Asp_Nam = Name_Global then | |
2346 | SPARK_Aspect_Error (Name_Refined_Global); | |
2347 | ||
2348 | elsif Asp_Nam = Name_Post then | |
2349 | SPARK_Aspect_Error (Name_Refined_Post); | |
2350 | ||
2351 | else | |
2352 | Error_Msg_N | |
2353 | ("aspect specification must appear in subprogram " | |
2354 | & "declaration", Asp); | |
2355 | end if; | |
2356 | ||
2357 | Next (Asp); | |
2358 | end loop; | |
2359 | end Diagnose_Misplaced_Aspects; | |
2360 | ||
2361 | -- Start of processing for Analyze_Aspects_On_Body_Or_Stub | |
2362 | ||
2363 | begin | |
2364 | -- Language-defined aspects cannot be associated with a subprogram | |
2365 | -- body [stub] if the subprogram has a spec. Certain implementation | |
2366 | -- defined aspects are allowed to break this rule (for list, see | |
2367 | -- table Aspect_On_Body_Or_Stub_OK). | |
2368 | ||
2369 | if Present (Spec_Id) and then not Aspects_On_Body_Or_Stub_OK (N) then | |
2370 | Diagnose_Misplaced_Aspects; | |
2371 | else | |
2372 | Analyze_Aspect_Specifications (N, Body_Id); | |
2373 | end if; | |
2374 | end Analyze_Aspects_On_Body_Or_Stub; | |
2375 | ||
ac072cb2 AC |
2376 | ----------------------- |
2377 | -- Body_Has_Contract -- | |
2378 | ----------------------- | |
2379 | ||
2380 | function Body_Has_Contract return Boolean is | |
2381 | Decls : constant List_Id := Declarations (N); | |
2382 | A_Spec : Node_Id; | |
2383 | A : Aspect_Id; | |
2384 | Decl : Node_Id; | |
2385 | P_Id : Pragma_Id; | |
2386 | ||
2387 | begin | |
2388 | -- Check for unanalyzed aspects in the body that will | |
2389 | -- generate a contract. | |
2390 | ||
2391 | if Present (Aspect_Specifications (N)) then | |
2392 | A_Spec := First (Aspect_Specifications (N)); | |
2393 | while Present (A_Spec) loop | |
2394 | A := Get_Aspect_Id (Chars (Identifier (A_Spec))); | |
2395 | ||
1399d355 AC |
2396 | if A = Aspect_Contract_Cases or else |
2397 | A = Aspect_Depends or else | |
2398 | A = Aspect_Global or else | |
2399 | A = Aspect_Pre or else | |
2400 | A = Aspect_Precondition or else | |
2401 | A = Aspect_Post or else | |
2402 | A = Aspect_Postcondition | |
ac072cb2 AC |
2403 | then |
2404 | return True; | |
2405 | end if; | |
2406 | ||
2407 | Next (A_Spec); | |
2408 | end loop; | |
2409 | end if; | |
2410 | ||
1399d355 | 2411 | -- Check for pragmas that may generate a contract |
ac072cb2 AC |
2412 | |
2413 | if Present (Decls) then | |
2414 | Decl := First (Decls); | |
2415 | while Present (Decl) loop | |
2416 | if Nkind (Decl) = N_Pragma then | |
2417 | P_Id := Get_Pragma_Id (Pragma_Name (Decl)); | |
2418 | ||
1399d355 AC |
2419 | if P_Id = Pragma_Contract_Cases or else |
2420 | P_Id = Pragma_Depends or else | |
2421 | P_Id = Pragma_Global or else | |
2422 | P_Id = Pragma_Pre or else | |
2423 | P_Id = Pragma_Precondition or else | |
2424 | P_Id = Pragma_Post or else | |
2425 | P_Id = Pragma_Postcondition | |
ac072cb2 AC |
2426 | then |
2427 | return True; | |
2428 | end if; | |
2429 | end if; | |
2430 | ||
2431 | Next (Decl); | |
2432 | end loop; | |
2433 | end if; | |
2434 | ||
2435 | return False; | |
2436 | end Body_Has_Contract; | |
2437 | ||
ec4867fa ES |
2438 | ---------------------------- |
2439 | -- Check_Anonymous_Return -- | |
2440 | ---------------------------- | |
2441 | ||
2442 | procedure Check_Anonymous_Return is | |
2443 | Decl : Node_Id; | |
a523b302 | 2444 | Par : Node_Id; |
ec4867fa ES |
2445 | Scop : Entity_Id; |
2446 | ||
2447 | begin | |
2448 | if Present (Spec_Id) then | |
2449 | Scop := Spec_Id; | |
2450 | else | |
2451 | Scop := Body_Id; | |
2452 | end if; | |
2453 | ||
2454 | if Ekind (Scop) = E_Function | |
2455 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 JM |
2456 | and then not Is_Thunk (Scop) |
2457 | and then (Has_Task (Designated_Type (Etype (Scop))) | |
2458 | or else | |
2459 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) | |
2460 | and then | |
2461 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 2462 | and then Expander_Active |
b20de9b9 | 2463 | |
8fde064e | 2464 | -- Avoid cases with no tasking support |
b20de9b9 AC |
2465 | |
2466 | and then RTE_Available (RE_Current_Master) | |
2467 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
2468 | then |
2469 | Decl := | |
2470 | Make_Object_Declaration (Loc, | |
2471 | Defining_Identifier => | |
2472 | Make_Defining_Identifier (Loc, Name_uMaster), | |
2473 | Constant_Present => True, | |
2474 | Object_Definition => | |
e4494292 | 2475 | New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
ec4867fa ES |
2476 | Expression => |
2477 | Make_Explicit_Dereference (Loc, | |
e4494292 | 2478 | New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
ec4867fa ES |
2479 | |
2480 | if Present (Declarations (N)) then | |
2481 | Prepend (Decl, Declarations (N)); | |
2482 | else | |
2483 | Set_Declarations (N, New_List (Decl)); | |
2484 | end if; | |
2485 | ||
2486 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
2487 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
2488 | |
2489 | -- Now mark the containing scope as a task master | |
2490 | ||
2491 | Par := N; | |
2492 | while Nkind (Par) /= N_Compilation_Unit loop | |
2493 | Par := Parent (Par); | |
2494 | pragma Assert (Present (Par)); | |
2495 | ||
2496 | -- If we fall off the top, we are at the outer level, and | |
2497 | -- the environment task is our effective master, so nothing | |
2498 | -- to mark. | |
2499 | ||
2500 | if Nkind_In | |
2501 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
2502 | then | |
2503 | Set_Is_Task_Master (Par, True); | |
2504 | exit; | |
2505 | end if; | |
2506 | end loop; | |
ec4867fa ES |
2507 | end if; |
2508 | end Check_Anonymous_Return; | |
2509 | ||
e660dbf7 JM |
2510 | ------------------------- |
2511 | -- Check_Inline_Pragma -- | |
2512 | ------------------------- | |
758c442c | 2513 | |
e660dbf7 JM |
2514 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
2515 | Prag : Node_Id; | |
2516 | Plist : List_Id; | |
0fb2ea01 | 2517 | |
21d27997 | 2518 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 2519 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 2520 | -- to this subprogram. |
21d27997 RD |
2521 | |
2522 | ----------------------- | |
2523 | -- Is_Inline_Pragma -- | |
2524 | ----------------------- | |
2525 | ||
2526 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
2527 | begin | |
2528 | return | |
2529 | Nkind (N) = N_Pragma | |
2530 | and then | |
8fde064e AC |
2531 | (Pragma_Name (N) = Name_Inline_Always |
2532 | or else | |
21d27997 RD |
2533 | (Front_End_Inlining |
2534 | and then Pragma_Name (N) = Name_Inline)) | |
2535 | and then | |
8fde064e AC |
2536 | Chars |
2537 | (Expression (First (Pragma_Argument_Associations (N)))) = | |
2538 | Chars (Body_Id); | |
21d27997 RD |
2539 | end Is_Inline_Pragma; |
2540 | ||
2541 | -- Start of processing for Check_Inline_Pragma | |
2542 | ||
c37bb106 | 2543 | begin |
e660dbf7 JM |
2544 | if not Expander_Active then |
2545 | return; | |
2546 | end if; | |
2547 | ||
2548 | if Is_List_Member (N) | |
2549 | and then Present (Next (N)) | |
21d27997 | 2550 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2551 | then |
2552 | Prag := Next (N); | |
2553 | ||
21d27997 RD |
2554 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2555 | and then Present (Declarations (N)) | |
2556 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2557 | then | |
2558 | Prag := First (Declarations (N)); | |
2559 | ||
e660dbf7 JM |
2560 | else |
2561 | Prag := Empty; | |
c37bb106 | 2562 | end if; |
e660dbf7 JM |
2563 | |
2564 | if Present (Prag) then | |
2565 | if Present (Spec_Id) then | |
30196a76 | 2566 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
2567 | Analyze (Prag); |
2568 | end if; | |
2569 | ||
2570 | else | |
d39d6bb8 | 2571 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
2572 | |
2573 | declare | |
2574 | Subp : constant Entity_Id := | |
30196a76 | 2575 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 2576 | Decl : constant Node_Id := |
30196a76 RD |
2577 | Make_Subprogram_Declaration (Loc, |
2578 | Specification => | |
2579 | New_Copy_Tree (Specification (N))); | |
2580 | ||
e660dbf7 JM |
2581 | begin |
2582 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
2583 | ||
2584 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 2585 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2586 | Set_Parameter_Specifications |
2587 | (Specification (Decl), Plist); | |
2588 | end if; | |
2589 | ||
2590 | Insert_Before (N, Decl); | |
2591 | Analyze (Decl); | |
2592 | Analyze (Prag); | |
2593 | Set_Has_Pragma_Inline (Subp); | |
2594 | ||
76a69663 | 2595 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2596 | Set_Is_Inlined (Subp); |
21d27997 | 2597 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2598 | end if; |
2599 | ||
158d55fa AC |
2600 | -- Prior to copying the subprogram body to create a template |
2601 | -- for it for subsequent inlining, remove the pragma from | |
2602 | -- the current body so that the copy that will produce the | |
2603 | -- new body will start from a completely unanalyzed tree. | |
2604 | ||
2605 | if Nkind (Parent (Prag)) = N_Subprogram_Body then | |
2606 | Rewrite (Prag, Make_Null_Statement (Sloc (Prag))); | |
2607 | end if; | |
2608 | ||
e660dbf7 JM |
2609 | Spec := Subp; |
2610 | end; | |
2611 | end if; | |
2612 | end if; | |
2613 | end Check_Inline_Pragma; | |
2614 | ||
7665e4bd AC |
2615 | -------------------------- |
2616 | -- Check_Missing_Return -- | |
2617 | -------------------------- | |
2618 | ||
2619 | procedure Check_Missing_Return is | |
2620 | Id : Entity_Id; | |
2621 | Missing_Ret : Boolean; | |
2622 | ||
2623 | begin | |
2624 | if Nkind (Body_Spec) = N_Function_Specification then | |
2625 | if Present (Spec_Id) then | |
2626 | Id := Spec_Id; | |
2627 | else | |
2628 | Id := Body_Id; | |
2629 | end if; | |
2630 | ||
fe5d3068 | 2631 | if Return_Present (Id) then |
7665e4bd AC |
2632 | Check_Returns (HSS, 'F', Missing_Ret); |
2633 | ||
2634 | if Missing_Ret then | |
2635 | Set_Has_Missing_Return (Id); | |
2636 | end if; | |
2637 | ||
2aca76d6 AC |
2638 | elsif Is_Generic_Subprogram (Id) |
2639 | or else not Is_Machine_Code_Subprogram (Id) | |
7665e4bd AC |
2640 | then |
2641 | Error_Msg_N ("missing RETURN statement in function body", N); | |
2642 | end if; | |
2643 | ||
fe5d3068 | 2644 | -- If procedure with No_Return, check returns |
607d0635 | 2645 | |
fe5d3068 YM |
2646 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
2647 | and then Present (Spec_Id) | |
2648 | and then No_Return (Spec_Id) | |
607d0635 | 2649 | then |
fe5d3068 YM |
2650 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
2651 | end if; | |
2652 | ||
ad05f2e9 | 2653 | -- Special checks in SPARK mode |
fe5d3068 YM |
2654 | |
2655 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 2656 | |
ad05f2e9 | 2657 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
2658 | |
2659 | declare | |
2660 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
2661 | begin | |
2662 | if Present (Stat) | |
7394c8cc AC |
2663 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
2664 | N_Extended_Return_Statement) | |
fe5d3068 | 2665 | then |
2ba431e5 | 2666 | Check_SPARK_Restriction |
fe5d3068 YM |
2667 | ("last statement in function should be RETURN", Stat); |
2668 | end if; | |
2669 | end; | |
2670 | ||
ad05f2e9 | 2671 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
2672 | |
2673 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
2674 | if Present (Spec_Id) then |
2675 | Id := Spec_Id; | |
2676 | else | |
2677 | Id := Body_Id; | |
2678 | end if; | |
2679 | ||
8d606a78 RD |
2680 | -- Would be nice to point to return statement here, can we |
2681 | -- borrow the Check_Returns procedure here ??? | |
2682 | ||
607d0635 | 2683 | if Return_Present (Id) then |
2ba431e5 | 2684 | Check_SPARK_Restriction |
fe5d3068 | 2685 | ("procedure should not have RETURN", N); |
607d0635 | 2686 | end if; |
7665e4bd AC |
2687 | end if; |
2688 | end Check_Missing_Return; | |
2689 | ||
d44202ba HK |
2690 | ----------------------- |
2691 | -- Disambiguate_Spec -- | |
2692 | ----------------------- | |
2693 | ||
2694 | function Disambiguate_Spec return Entity_Id is | |
2695 | Priv_Spec : Entity_Id; | |
2696 | Spec_N : Entity_Id; | |
2697 | ||
2698 | procedure Replace_Types (To_Corresponding : Boolean); | |
2699 | -- Depending on the flag, replace the type of formal parameters of | |
2700 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2701 | -- the corresponding record type or the other way around. | |
2702 | ||
2703 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2704 | Formal : Entity_Id; | |
2705 | Formal_Typ : Entity_Id; | |
2706 | ||
2707 | begin | |
2708 | Formal := First_Formal (Body_Id); | |
2709 | while Present (Formal) loop | |
2710 | Formal_Typ := Etype (Formal); | |
2711 | ||
df3e68b1 HK |
2712 | if Is_Class_Wide_Type (Formal_Typ) then |
2713 | Formal_Typ := Root_Type (Formal_Typ); | |
2714 | end if; | |
2715 | ||
d44202ba HK |
2716 | -- From concurrent type to corresponding record |
2717 | ||
2718 | if To_Corresponding then | |
2719 | if Is_Concurrent_Type (Formal_Typ) | |
2720 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
2721 | and then Present (Interfaces ( | |
2722 | Corresponding_Record_Type (Formal_Typ))) | |
2723 | then | |
2724 | Set_Etype (Formal, | |
2725 | Corresponding_Record_Type (Formal_Typ)); | |
2726 | end if; | |
2727 | ||
2728 | -- From corresponding record to concurrent type | |
2729 | ||
2730 | else | |
2731 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2732 | and then Present (Interfaces (Formal_Typ)) | |
2733 | then | |
2734 | Set_Etype (Formal, | |
2735 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2736 | end if; | |
2737 | end if; | |
2738 | ||
2739 | Next_Formal (Formal); | |
2740 | end loop; | |
2741 | end Replace_Types; | |
2742 | ||
2743 | -- Start of processing for Disambiguate_Spec | |
2744 | ||
2745 | begin | |
2746 | -- Try to retrieve the specification of the body as is. All error | |
2747 | -- messages are suppressed because the body may not have a spec in | |
2748 | -- its current state. | |
2749 | ||
2750 | Spec_N := Find_Corresponding_Spec (N, False); | |
2751 | ||
2752 | -- It is possible that this is the body of a primitive declared | |
2753 | -- between a private and a full view of a concurrent type. The | |
2754 | -- controlling parameter of the spec carries the concurrent type, | |
2755 | -- not the corresponding record type as transformed by Analyze_ | |
2756 | -- Subprogram_Specification. In such cases, we undo the change | |
2757 | -- made by the analysis of the specification and try to find the | |
2758 | -- spec again. | |
766d7add | 2759 | |
8198b93d HK |
2760 | -- Note that wrappers already have their corresponding specs and |
2761 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2762 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2763 | -- original concurrent status. |
d44202ba | 2764 | |
8198b93d HK |
2765 | if No (Spec_N) |
2766 | or else Is_Primitive_Wrapper (Spec_N) | |
2767 | then | |
d44202ba HK |
2768 | -- Restore all references of corresponding record types to the |
2769 | -- original concurrent types. | |
2770 | ||
2771 | Replace_Types (To_Corresponding => False); | |
2772 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2773 | ||
2774 | -- The current body truly belongs to a primitive declared between | |
2775 | -- a private and a full view. We leave the modified body as is, | |
2776 | -- and return the true spec. | |
2777 | ||
2778 | if Present (Priv_Spec) | |
2779 | and then Is_Private_Primitive (Priv_Spec) | |
2780 | then | |
2781 | return Priv_Spec; | |
2782 | end if; | |
2783 | ||
2784 | -- In case that this is some sort of error, restore the original | |
2785 | -- state of the body. | |
2786 | ||
2787 | Replace_Types (To_Corresponding => True); | |
2788 | end if; | |
2789 | ||
2790 | return Spec_N; | |
2791 | end Disambiguate_Spec; | |
2792 | ||
5dcab3ca AC |
2793 | ---------------------------- |
2794 | -- Exchange_Limited_Views -- | |
2795 | ---------------------------- | |
2796 | ||
2797 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id) is | |
2798 | procedure Detect_And_Exchange (Id : Entity_Id); | |
2799 | -- Determine whether Id's type denotes an incomplete type associated | |
2800 | -- with a limited with clause and exchange the limited view with the | |
2801 | -- non-limited one. | |
2802 | ||
2803 | ------------------------- | |
2804 | -- Detect_And_Exchange -- | |
2805 | ------------------------- | |
2806 | ||
2807 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
2808 | Typ : constant Entity_Id := Etype (Id); | |
2809 | ||
2810 | begin | |
2811 | if Ekind (Typ) = E_Incomplete_Type | |
7b56a91b | 2812 | and then From_Limited_With (Typ) |
5dcab3ca AC |
2813 | and then Present (Non_Limited_View (Typ)) |
2814 | then | |
2815 | Set_Etype (Id, Non_Limited_View (Typ)); | |
2816 | end if; | |
2817 | end Detect_And_Exchange; | |
2818 | ||
2819 | -- Local variables | |
2820 | ||
2821 | Formal : Entity_Id; | |
2822 | ||
2823 | -- Start of processing for Exchange_Limited_Views | |
2824 | ||
2825 | begin | |
2826 | if No (Subp_Id) then | |
2827 | return; | |
2828 | ||
2829 | -- Do not process subprogram bodies as they already use the non- | |
2830 | -- limited view of types. | |
2831 | ||
2832 | elsif not Ekind_In (Subp_Id, E_Function, E_Procedure) then | |
2833 | return; | |
2834 | end if; | |
2835 | ||
2836 | -- Examine all formals and swap views when applicable | |
2837 | ||
2838 | Formal := First_Formal (Subp_Id); | |
2839 | while Present (Formal) loop | |
2840 | Detect_And_Exchange (Formal); | |
2841 | ||
2842 | Next_Formal (Formal); | |
2843 | end loop; | |
2844 | ||
2845 | -- Process the return type of a function | |
2846 | ||
2847 | if Ekind (Subp_Id) = E_Function then | |
2848 | Detect_And_Exchange (Subp_Id); | |
2849 | end if; | |
2850 | end Exchange_Limited_Views; | |
2851 | ||
d44202ba HK |
2852 | ------------------------------------- |
2853 | -- Is_Private_Concurrent_Primitive -- | |
2854 | ------------------------------------- | |
2855 | ||
2856 | function Is_Private_Concurrent_Primitive | |
2857 | (Subp_Id : Entity_Id) return Boolean | |
2858 | is | |
2859 | Formal_Typ : Entity_Id; | |
2860 | ||
2861 | begin | |
2862 | if Present (First_Formal (Subp_Id)) then | |
2863 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2864 | ||
2865 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2866 | if Is_Class_Wide_Type (Formal_Typ) then |
2867 | Formal_Typ := Root_Type (Formal_Typ); | |
2868 | end if; | |
2869 | ||
d44202ba HK |
2870 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2871 | end if; | |
2872 | ||
2873 | -- The type of the first formal is a concurrent tagged type with | |
2874 | -- a private view. | |
2875 | ||
2876 | return | |
2877 | Is_Concurrent_Type (Formal_Typ) | |
2878 | and then Is_Tagged_Type (Formal_Typ) | |
2879 | and then Has_Private_Declaration (Formal_Typ); | |
2880 | end if; | |
2881 | ||
2882 | return False; | |
2883 | end Is_Private_Concurrent_Primitive; | |
2884 | ||
76a69663 ES |
2885 | ---------------------------- |
2886 | -- Set_Trivial_Subprogram -- | |
2887 | ---------------------------- | |
2888 | ||
2889 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2890 | Nxt : constant Node_Id := Next (N); | |
2891 | ||
2892 | begin | |
2893 | Set_Is_Trivial_Subprogram (Body_Id); | |
2894 | ||
2895 | if Present (Spec_Id) then | |
2896 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2897 | end if; | |
2898 | ||
2899 | if Present (Nxt) | |
2900 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2901 | and then No (Next (Nxt)) | |
2902 | and then Present (Expression (Nxt)) | |
2903 | and then Is_Entity_Name (Expression (Nxt)) | |
2904 | then | |
2905 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2906 | end if; | |
2907 | end Set_Trivial_Subprogram; | |
2908 | ||
758c442c GD |
2909 | --------------------------------- |
2910 | -- Verify_Overriding_Indicator -- | |
2911 | --------------------------------- | |
2912 | ||
2913 | procedure Verify_Overriding_Indicator is | |
2914 | begin | |
21d27997 RD |
2915 | if Must_Override (Body_Spec) then |
2916 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
2917 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2918 | then | |
2919 | null; | |
2920 | ||
038140ed | 2921 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2922 | Error_Msg_NE |
21d27997 | 2923 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
23e28b42 AC |
2924 | |
2925 | -- Overriding indicators aren't allowed for protected subprogram | |
2926 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
2927 | -- this to a warning if -gnatd.E is enabled. | |
2928 | ||
2929 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
2930 | Error_Msg_Warn := Error_To_Warning; | |
2931 | Error_Msg_N | |
b785e0b8 | 2932 | ("<<overriding indicator not allowed for protected " |
23e28b42 | 2933 | & "subprogram body", Body_Spec); |
21d27997 | 2934 | end if; |
758c442c | 2935 | |
5d37ba92 | 2936 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2937 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2938 | Error_Msg_NE |
5d37ba92 | 2939 | ("subprogram& overrides inherited operation", |
76a69663 | 2940 | Body_Spec, Spec_Id); |
5d37ba92 | 2941 | |
21d27997 RD |
2942 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
2943 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2944 | then | |
ed2233dc | 2945 | Error_Msg_NE |
21d27997 RD |
2946 | ("subprogram & overrides predefined operator ", |
2947 | Body_Spec, Spec_Id); | |
2948 | ||
23e28b42 AC |
2949 | -- Overriding indicators aren't allowed for protected subprogram |
2950 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
2951 | -- this to a warning if -gnatd.E is enabled. | |
2952 | ||
2953 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
2954 | Error_Msg_Warn := Error_To_Warning; | |
5d37ba92 | 2955 | |
23e28b42 | 2956 | Error_Msg_N |
b785e0b8 | 2957 | ("<<overriding indicator not allowed " & |
23e28b42 AC |
2958 | "for protected subprogram body", |
2959 | Body_Spec); | |
2960 | ||
2961 | -- If this is not a primitive operation, then the overriding | |
2962 | -- indicator is altogether illegal. | |
2963 | ||
2964 | elsif not Is_Primitive (Spec_Id) then | |
ed2233dc | 2965 | Error_Msg_N |
19d846a0 RD |
2966 | ("overriding indicator only allowed " & |
2967 | "if subprogram is primitive", | |
2968 | Body_Spec); | |
5d37ba92 | 2969 | end if; |
235f4375 | 2970 | |
23e28b42 AC |
2971 | -- If checking the style rule and the operation overrides, then |
2972 | -- issue a warning about a missing overriding_indicator. Protected | |
2973 | -- subprogram bodies are excluded from this style checking, since | |
2974 | -- they aren't primitives (even though their declarations can | |
2975 | -- override) and aren't allowed to have an overriding_indicator. | |
2976 | ||
806f6d37 | 2977 | elsif Style_Check |
038140ed | 2978 | and then Present (Overridden_Operation (Spec_Id)) |
23e28b42 | 2979 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type |
235f4375 AC |
2980 | then |
2981 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2982 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
2983 | |
2984 | elsif Style_Check | |
2985 | and then Can_Override_Operator (Spec_Id) | |
2986 | and then not Is_Predefined_File_Name | |
2987 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
2988 | then | |
2989 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2990 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
2991 | end if; |
2992 | end Verify_Overriding_Indicator; | |
2993 | ||
b1b543d2 | 2994 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 2995 | |
996ae0b0 | 2996 | begin |
82c80734 RD |
2997 | -- Generic subprograms are handled separately. They always have a |
2998 | -- generic specification. Determine whether current scope has a | |
2999 | -- previous declaration. | |
996ae0b0 | 3000 | |
82c80734 RD |
3001 | -- If the subprogram body is defined within an instance of the same |
3002 | -- name, the instance appears as a package renaming, and will be hidden | |
3003 | -- within the subprogram. | |
996ae0b0 RK |
3004 | |
3005 | if Present (Prev_Id) | |
3006 | and then not Is_Overloadable (Prev_Id) | |
3007 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
3008 | or else Comes_From_Source (Prev_Id)) | |
3009 | then | |
fbf5a39b | 3010 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 RK |
3011 | Spec_Id := Prev_Id; |
3012 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
3013 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3014 | ||
3015 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
3016 | |
3017 | if Nkind (N) = N_Subprogram_Body then | |
3018 | HSS := Handled_Statement_Sequence (N); | |
3019 | Check_Missing_Return; | |
3020 | end if; | |
3021 | ||
996ae0b0 RK |
3022 | return; |
3023 | ||
3024 | else | |
82c80734 RD |
3025 | -- Previous entity conflicts with subprogram name. Attempting to |
3026 | -- enter name will post error. | |
996ae0b0 RK |
3027 | |
3028 | Enter_Name (Body_Id); | |
3029 | return; | |
3030 | end if; | |
3031 | ||
82c80734 RD |
3032 | -- Non-generic case, find the subprogram declaration, if one was seen, |
3033 | -- or enter new overloaded entity in the current scope. If the | |
3034 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
3035 | -- part of the context of one of its subunits. No need to redo the | |
3036 | -- analysis. | |
996ae0b0 | 3037 | |
8fde064e | 3038 | elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
996ae0b0 RK |
3039 | return; |
3040 | ||
3041 | else | |
fbf5a39b | 3042 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
3043 | |
3044 | if Nkind (N) = N_Subprogram_Body_Stub | |
3045 | or else No (Corresponding_Spec (N)) | |
3046 | then | |
d44202ba HK |
3047 | if Is_Private_Concurrent_Primitive (Body_Id) then |
3048 | Spec_Id := Disambiguate_Spec; | |
3049 | else | |
3050 | Spec_Id := Find_Corresponding_Spec (N); | |
b6c8e5be AC |
3051 | |
3052 | -- In GNATprove mode, if the body has no previous spec, create | |
3053 | -- one so that the inlining machinery can operate properly. | |
3054 | -- Transfer aspects, if any, to the new spec, so that they | |
3055 | -- are legal and can be processed ahead of the body. | |
3056 | -- We make two copies of the given spec, one for the new | |
3057 | -- declaration, and one for the body. | |
3058 | ||
b6c8e5be AC |
3059 | if No (Spec_Id) |
3060 | and then GNATprove_Mode | |
480156b2 | 3061 | |
480156b2 AC |
3062 | -- Inlining does not apply during pre-analysis of code |
3063 | ||
b6c8e5be | 3064 | and then Full_Analysis |
480156b2 AC |
3065 | |
3066 | -- Inlining only applies to full bodies, not stubs | |
3067 | ||
7b2888e6 | 3068 | and then Nkind (N) /= N_Subprogram_Body_Stub |
480156b2 AC |
3069 | |
3070 | -- Inlining only applies to bodies in the source code, not to | |
3071 | -- those generated by the compiler. In particular, expression | |
3072 | -- functions, whose body is generated by the compiler, are | |
3073 | -- treated specially by GNATprove. | |
3074 | ||
b6c8e5be | 3075 | and then Comes_From_Source (Body_Id) |
480156b2 AC |
3076 | |
3077 | -- This cannot be done for a compilation unit, which is not | |
3078 | -- in a context where we can insert a new spec. | |
3079 | ||
b6c8e5be | 3080 | and then Is_List_Member (N) |
480156b2 AC |
3081 | |
3082 | -- Inlining only applies to subprograms without contracts, | |
3083 | -- as a contract is a sign that GNATprove should perform a | |
3084 | -- modular analysis of the subprogram instead of a contextual | |
3085 | -- analysis at each call site. The same test is performed in | |
3086 | -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated | |
3087 | -- here in another form (because the contract has not | |
3088 | -- been attached to the body) to avoid frontend errors in | |
3089 | -- case pragmas are used instead of aspects, because the | |
3090 | -- corresponding pragmas in the body would not be transferred | |
3091 | -- to the spec, leading to legality errors. | |
3092 | ||
ac072cb2 | 3093 | and then not Body_Has_Contract |
b6c8e5be AC |
3094 | then |
3095 | declare | |
3096 | Body_Spec : constant Node_Id := | |
662c2ad4 | 3097 | Copy_Separate_Tree (Specification (N)); |
eb1ee757 AC |
3098 | New_Decl : constant Node_Id := |
3099 | Make_Subprogram_Declaration (Loc, | |
3100 | Copy_Separate_Tree (Specification (N))); | |
3101 | ||
2178830b | 3102 | SPARK_Mode_Aspect : Node_Id; |
eb1ee757 AC |
3103 | Aspects : List_Id; |
3104 | Prag, Aspect : Node_Id; | |
b6c8e5be AC |
3105 | |
3106 | begin | |
3107 | Insert_Before (N, New_Decl); | |
3108 | Move_Aspects (From => N, To => New_Decl); | |
2178830b AC |
3109 | |
3110 | -- Mark the newly moved aspects as not analyzed, so that | |
3111 | -- their effect on New_Decl is properly analyzed. | |
3112 | ||
3113 | Aspect := First (Aspect_Specifications (New_Decl)); | |
3114 | while Present (Aspect) loop | |
3115 | Set_Analyzed (Aspect, False); | |
3116 | Next (Aspect); | |
3117 | end loop; | |
3118 | ||
b6c8e5be | 3119 | Analyze (New_Decl); |
2178830b AC |
3120 | |
3121 | -- The analysis of the generated subprogram declaration | |
eb1ee757 | 3122 | -- may have introduced pragmas that need to be analyzed. |
2178830b AC |
3123 | |
3124 | Prag := Next (New_Decl); | |
3125 | while Prag /= N loop | |
3126 | Analyze (Prag); | |
3127 | Next (Prag); | |
3128 | end loop; | |
3129 | ||
b6c8e5be AC |
3130 | Spec_Id := Defining_Entity (New_Decl); |
3131 | ||
793c5f05 AC |
3132 | -- As Body_Id originally comes from source, mark the new |
3133 | -- Spec_Id as such, which is required so that calls to | |
3134 | -- this subprogram are registered in the local effects | |
3135 | -- stored in ALI files for GNATprove. | |
3136 | ||
3137 | Set_Comes_From_Source (Spec_Id, True); | |
3138 | ||
2178830b AC |
3139 | -- If aspect SPARK_Mode was specified on the body, it |
3140 | -- needs to be repeated on the generated decl and the | |
3141 | -- body. Since the original aspect was moved to the | |
3142 | -- generated decl, copy it for the body. | |
3143 | ||
3144 | if Has_Aspect (Spec_Id, Aspect_SPARK_Mode) then | |
3145 | SPARK_Mode_Aspect := | |
3146 | New_Copy (Find_Aspect (Spec_Id, Aspect_SPARK_Mode)); | |
3147 | Set_Analyzed (SPARK_Mode_Aspect, False); | |
eb1ee757 | 3148 | Aspects := New_List (SPARK_Mode_Aspect); |
2178830b AC |
3149 | Set_Aspect_Specifications (N, Aspects); |
3150 | end if; | |
3151 | ||
b6c8e5be AC |
3152 | Set_Specification (N, Body_Spec); |
3153 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); | |
3154 | Set_Corresponding_Spec (N, Spec_Id); | |
3155 | end; | |
3156 | end if; | |
d44202ba | 3157 | end if; |
996ae0b0 RK |
3158 | |
3159 | -- If this is a duplicate body, no point in analyzing it | |
3160 | ||
3161 | if Error_Posted (N) then | |
3162 | return; | |
3163 | end if; | |
3164 | ||
82c80734 RD |
3165 | -- A subprogram body should cause freezing of its own declaration, |
3166 | -- but if there was no previous explicit declaration, then the | |
3167 | -- subprogram will get frozen too late (there may be code within | |
3168 | -- the body that depends on the subprogram having been frozen, | |
3169 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 3170 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
3171 | -- Finally, if the return type is an anonymous access to protected |
3172 | -- subprogram, it must be frozen before the body because its | |
3173 | -- expansion has generated an equivalent type that is used when | |
3174 | -- elaborating the body. | |
996ae0b0 | 3175 | |
885c4871 | 3176 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
3177 | -- created for expression functions do not freeze. |
3178 | ||
3179 | if No (Spec_Id) | |
3180 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
3181 | then | |
996ae0b0 RK |
3182 | Freeze_Before (N, Body_Id); |
3183 | ||
3184 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
3185 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
3186 | |
3187 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
3188 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 3189 | end if; |
a38ff9b1 | 3190 | |
996ae0b0 RK |
3191 | else |
3192 | Spec_Id := Corresponding_Spec (N); | |
3193 | end if; | |
3194 | end if; | |
3195 | ||
799d0e05 AC |
3196 | -- Previously we scanned the body to look for nested subprograms, and |
3197 | -- rejected an inline directive if nested subprograms were present, | |
3198 | -- because the back-end would generate conflicting symbols for the | |
c8957aae | 3199 | -- nested bodies. This is now unnecessary. |
07fc65c4 | 3200 | |
c8957aae | 3201 | -- Look ahead to recognize a pragma Inline that appears after the body |
84f4072a | 3202 | |
e660dbf7 JM |
3203 | Check_Inline_Pragma (Spec_Id); |
3204 | ||
701b7fbb RD |
3205 | -- Deal with special case of a fully private operation in the body of |
3206 | -- the protected type. We must create a declaration for the subprogram, | |
3207 | -- in order to attach the protected subprogram that will be used in | |
3208 | -- internal calls. We exclude compiler generated bodies from the | |
3209 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 3210 | |
996ae0b0 RK |
3211 | if No (Spec_Id) |
3212 | and then Comes_From_Source (N) | |
3213 | and then Is_Protected_Type (Current_Scope) | |
3214 | then | |
47bfea3a | 3215 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 3216 | end if; |
996ae0b0 | 3217 | |
5334d18f | 3218 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 3219 | |
701b7fbb | 3220 | if Present (Spec_Id) then |
996ae0b0 | 3221 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 3222 | Verify_Overriding_Indicator; |
5d37ba92 ES |
3223 | |
3224 | -- In general, the spec will be frozen when we start analyzing the | |
3225 | -- body. However, for internally generated operations, such as | |
3226 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
3227 | -- results, the spec may not have been frozen by the time we expand |
3228 | -- the freeze actions that include the bodies. In particular, extra | |
3229 | -- formals for accessibility or for return-in-place may need to be | |
3230 | -- generated. Freeze nodes, if any, are inserted before the current | |
3231 | -- body. These freeze actions are also needed in ASIS mode to enable | |
3232 | -- the proper back-annotations. | |
5d37ba92 ES |
3233 | |
3234 | if not Is_Frozen (Spec_Id) | |
7134062a | 3235 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
3236 | then |
3237 | -- Force the generation of its freezing node to ensure proper | |
3238 | -- management of access types in the backend. | |
3239 | ||
3240 | -- This is definitely needed for some cases, but it is not clear | |
3241 | -- why, to be investigated further??? | |
3242 | ||
3243 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 3244 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 3245 | end if; |
996ae0b0 RK |
3246 | end if; |
3247 | ||
a5d83d61 AC |
3248 | -- Mark presence of postcondition procedure in current scope and mark |
3249 | -- the procedure itself as needing debug info. The latter is important | |
3250 | -- when analyzing decision coverage (for example, for MC/DC coverage). | |
7ca78bba | 3251 | |
0dabde3a ES |
3252 | if Chars (Body_Id) = Name_uPostconditions then |
3253 | Set_Has_Postconditions (Current_Scope); | |
a5d83d61 | 3254 | Set_Debug_Info_Needed (Body_Id); |
0dabde3a ES |
3255 | end if; |
3256 | ||
996ae0b0 RK |
3257 | -- Place subprogram on scope stack, and make formals visible. If there |
3258 | -- is a spec, the visible entity remains that of the spec. | |
3259 | ||
3260 | if Present (Spec_Id) then | |
07fc65c4 | 3261 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
3262 | |
3263 | if Is_Child_Unit (Spec_Id) then | |
3264 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
3265 | end if; | |
3266 | ||
fbf5a39b AC |
3267 | if Style_Check then |
3268 | Style.Check_Identifier (Body_Id, Spec_Id); | |
3269 | end if; | |
996ae0b0 RK |
3270 | |
3271 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
3272 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3273 | ||
f937473f | 3274 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 3275 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
996ae0b0 | 3276 | return; |
21d27997 | 3277 | |
996ae0b0 RK |
3278 | else |
3279 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
3280 | Set_Has_Completion (Spec_Id); | |
3281 | ||
3282 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 3283 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
3284 | end if; |
3285 | ||
3286 | -- If this is a body generated for a renaming, do not check for | |
3287 | -- full conformance. The check is redundant, because the spec of | |
3288 | -- the body is a copy of the spec in the renaming declaration, | |
3289 | -- and the test can lead to spurious errors on nested defaults. | |
3290 | ||
3291 | if Present (Spec_Decl) | |
996ae0b0 | 3292 | and then not Comes_From_Source (N) |
93a81b02 GB |
3293 | and then |
3294 | (Nkind (Original_Node (Spec_Decl)) = | |
d2f97d3e | 3295 | N_Subprogram_Renaming_Declaration |
466c2127 AC |
3296 | or else (Present (Corresponding_Body (Spec_Decl)) |
3297 | and then | |
3298 | Nkind (Unit_Declaration_Node | |
3299 | (Corresponding_Body (Spec_Decl))) = | |
3300 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
3301 | then |
3302 | Conformant := True; | |
cabe9abc AC |
3303 | |
3304 | -- Conversely, the spec may have been generated for specless body | |
3305 | -- with an inline pragma. | |
3306 | ||
3307 | elsif Comes_From_Source (N) | |
3308 | and then not Comes_From_Source (Spec_Id) | |
3309 | and then Has_Pragma_Inline (Spec_Id) | |
3310 | then | |
3311 | Conformant := True; | |
76a69663 | 3312 | |
996ae0b0 RK |
3313 | else |
3314 | Check_Conformance | |
3315 | (Body_Id, Spec_Id, | |
76a69663 | 3316 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
3317 | end if; |
3318 | ||
3319 | -- If the body is not fully conformant, we have to decide if we | |
3320 | -- should analyze it or not. If it has a really messed up profile | |
3321 | -- then we probably should not analyze it, since we will get too | |
3322 | -- many bogus messages. | |
3323 | ||
3324 | -- Our decision is to go ahead in the non-fully conformant case | |
3325 | -- only if it is at least mode conformant with the spec. Note | |
3326 | -- that the call to Check_Fully_Conformant has issued the proper | |
3327 | -- error messages to complain about the lack of conformance. | |
3328 | ||
3329 | if not Conformant | |
3330 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
3331 | then | |
3332 | return; | |
3333 | end if; | |
3334 | end if; | |
3335 | ||
996ae0b0 | 3336 | if Spec_Id /= Body_Id then |
fbf5a39b | 3337 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
3338 | end if; |
3339 | ||
579847c2 AC |
3340 | Set_Ekind (Body_Id, E_Subprogram_Body); |
3341 | ||
e28072cd AC |
3342 | if Nkind (N) = N_Subprogram_Body_Stub then |
3343 | Set_Corresponding_Spec_Of_Stub (N, Spec_Id); | |
3344 | ||
3345 | -- Regular body | |
3346 | ||
3347 | else | |
996ae0b0 | 3348 | Set_Corresponding_Spec (N, Spec_Id); |
758c442c | 3349 | |
5d37ba92 ES |
3350 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
3351 | -- of a concurrent type, the type of the first parameter has been | |
3352 | -- replaced with the corresponding record, which is the proper | |
3353 | -- run-time structure to use. However, within the body there may | |
3354 | -- be uses of the formals that depend on primitive operations | |
3355 | -- of the type (in particular calls in prefixed form) for which | |
3356 | -- we need the original concurrent type. The operation may have | |
3357 | -- several controlling formals, so the replacement must be done | |
3358 | -- for all of them. | |
758c442c GD |
3359 | |
3360 | if Comes_From_Source (Spec_Id) | |
3361 | and then Present (First_Entity (Spec_Id)) | |
3362 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
3363 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
15918371 AC |
3364 | and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
3365 | and then Present (Corresponding_Concurrent_Type | |
3366 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 3367 | then |
5d37ba92 ES |
3368 | declare |
3369 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
3370 | Form : Entity_Id; | |
3371 | ||
3372 | begin | |
3373 | Form := First_Formal (Spec_Id); | |
3374 | while Present (Form) loop | |
3375 | if Etype (Form) = Typ then | |
3376 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
3377 | end if; | |
3378 | ||
3379 | Next_Formal (Form); | |
3380 | end loop; | |
3381 | end; | |
758c442c GD |
3382 | end if; |
3383 | ||
21d27997 RD |
3384 | -- Make the formals visible, and place subprogram on scope stack. |
3385 | -- This is also the point at which we set Last_Real_Spec_Entity | |
3386 | -- to mark the entities which will not be moved to the body. | |
758c442c | 3387 | |
996ae0b0 | 3388 | Install_Formals (Spec_Id); |
21d27997 | 3389 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
616547fa AC |
3390 | |
3391 | -- Within an instance, add local renaming declarations so that | |
a5a809b2 AC |
3392 | -- gdb can retrieve the values of actuals more easily. This is |
3393 | -- only relevant if generating code (and indeed we definitely | |
3394 | -- do not want these definitions -gnatc mode, because that would | |
3395 | -- confuse ASIS). | |
616547fa AC |
3396 | |
3397 | if Is_Generic_Instance (Spec_Id) | |
3398 | and then Is_Wrapper_Package (Current_Scope) | |
a5a809b2 | 3399 | and then Expander_Active |
616547fa AC |
3400 | then |
3401 | Build_Subprogram_Instance_Renamings (N, Current_Scope); | |
3402 | end if; | |
3403 | ||
0a36105d | 3404 | Push_Scope (Spec_Id); |
996ae0b0 RK |
3405 | |
3406 | -- Make sure that the subprogram is immediately visible. For | |
3407 | -- child units that have no separate spec this is indispensable. | |
3408 | -- Otherwise it is safe albeit redundant. | |
3409 | ||
3410 | Set_Is_Immediately_Visible (Spec_Id); | |
3411 | end if; | |
3412 | ||
3413 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
ea3c0651 | 3414 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
996ae0b0 | 3415 | Set_Scope (Body_Id, Scope (Spec_Id)); |
ec4867fa | 3416 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
996ae0b0 RK |
3417 | |
3418 | -- Case of subprogram body with no previous spec | |
3419 | ||
3420 | else | |
3e5daac4 AC |
3421 | -- Check for style warning required |
3422 | ||
996ae0b0 | 3423 | if Style_Check |
3e5daac4 AC |
3424 | |
3425 | -- Only apply check for source level subprograms for which checks | |
3426 | -- have not been suppressed. | |
3427 | ||
996ae0b0 RK |
3428 | and then Comes_From_Source (Body_Id) |
3429 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
3430 | |
3431 | -- No warnings within an instance | |
3432 | ||
996ae0b0 | 3433 | and then not In_Instance |
3e5daac4 | 3434 | |
b0186f71 | 3435 | -- No warnings for expression functions |
3e5daac4 | 3436 | |
b0186f71 | 3437 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
3438 | then |
3439 | Style.Body_With_No_Spec (N); | |
3440 | end if; | |
3441 | ||
3442 | New_Overloaded_Entity (Body_Id); | |
3443 | ||
3444 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
3445 | Set_Acts_As_Spec (N); | |
3446 | Generate_Definition (Body_Id); | |
dac3bede | 3447 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
fbf5a39b AC |
3448 | Generate_Reference |
3449 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 3450 | Install_Formals (Body_Id); |
e949ee22 | 3451 | |
4a854847 | 3452 | Push_Scope (Body_Id); |
996ae0b0 | 3453 | end if; |
dbe36d67 AC |
3454 | |
3455 | -- For stubs and bodies with no previous spec, generate references to | |
3456 | -- formals. | |
3457 | ||
3458 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
3459 | end if; |
3460 | ||
5216b599 AC |
3461 | -- Set SPARK_Mode from context |
3462 | ||
3463 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); | |
3464 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
3465 | ||
76a69663 ES |
3466 | -- If the return type is an anonymous access type whose designated type |
3467 | -- is the limited view of a class-wide type and the non-limited view is | |
3468 | -- available, update the return type accordingly. | |
ec4867fa | 3469 | |
8fde064e | 3470 | if Ada_Version >= Ada_2005 and then Comes_From_Source (N) then |
ec4867fa | 3471 | declare |
ec4867fa | 3472 | Etyp : Entity_Id; |
0a36105d | 3473 | Rtyp : Entity_Id; |
ec4867fa ES |
3474 | |
3475 | begin | |
0a36105d JM |
3476 | Rtyp := Etype (Current_Scope); |
3477 | ||
3478 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
3479 | Etyp := Directly_Designated_Type (Rtyp); | |
3480 | ||
7b56a91b AC |
3481 | if Is_Class_Wide_Type (Etyp) |
3482 | and then From_Limited_With (Etyp) | |
3483 | then | |
0a36105d JM |
3484 | Set_Directly_Designated_Type |
3485 | (Etype (Current_Scope), Available_View (Etyp)); | |
3486 | end if; | |
3487 | end if; | |
ec4867fa ES |
3488 | end; |
3489 | end if; | |
3490 | ||
996ae0b0 RK |
3491 | -- If this is the proper body of a stub, we must verify that the stub |
3492 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 3493 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
3494 | -- only required for subprograms that come from source. |
3495 | ||
3496 | if Nkind (Parent (N)) = N_Subunit | |
3497 | and then Comes_From_Source (N) | |
3498 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
3499 | and then Nkind (Corresponding_Stub (Parent (N))) = |
3500 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
3501 | then |
3502 | declare | |
fbf5a39b AC |
3503 | Old_Id : constant Entity_Id := |
3504 | Defining_Entity | |
3505 | (Specification (Corresponding_Stub (Parent (N)))); | |
3506 | ||
996ae0b0 | 3507 | Conformant : Boolean := False; |
996ae0b0 RK |
3508 | |
3509 | begin | |
3510 | if No (Spec_Id) then | |
3511 | Check_Fully_Conformant (Body_Id, Old_Id); | |
3512 | ||
3513 | else | |
3514 | Check_Conformance | |
3515 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
3516 | ||
3517 | if not Conformant then | |
3518 | ||
dbe36d67 AC |
3519 | -- The stub was taken to be a new declaration. Indicate that |
3520 | -- it lacks a body. | |
996ae0b0 RK |
3521 | |
3522 | Set_Has_Completion (Old_Id, False); | |
3523 | end if; | |
3524 | end if; | |
3525 | end; | |
3526 | end if; | |
3527 | ||
3528 | Set_Has_Completion (Body_Id); | |
3529 | Check_Eliminated (Body_Id); | |
3530 | ||
3531 | if Nkind (N) = N_Subprogram_Body_Stub then | |
c8a3028c AC |
3532 | |
3533 | -- Analyze any aspect specifications that appear on the subprogram | |
3534 | -- body stub. | |
3535 | ||
3536 | if Has_Aspects (N) then | |
3537 | Analyze_Aspects_On_Body_Or_Stub; | |
3538 | end if; | |
3539 | ||
3540 | -- Stop the analysis now as the stub cannot be inlined, plus it does | |
3541 | -- not have declarative or statement lists. | |
3542 | ||
996ae0b0 | 3543 | return; |
84f4072a | 3544 | end if; |
996ae0b0 | 3545 | |
b94b6c56 | 3546 | -- Handle frontend inlining |
84f4072a | 3547 | |
b94b6c56 RD |
3548 | -- Note: Normally we don't do any inlining if expansion is off, since |
3549 | -- we won't generate code in any case. An exception arises in GNATprove | |
2d180af1 YM |
3550 | -- mode where we want to expand some calls in place, even with expansion |
3551 | -- disabled, since the inlining eases formal verification. | |
ecad37f3 | 3552 | |
84f4072a JM |
3553 | -- Old semantics |
3554 | ||
3555 | if not Debug_Flag_Dot_K then | |
3556 | if Present (Spec_Id) | |
2d180af1 | 3557 | and then Expander_Active |
84f4072a JM |
3558 | and then |
3559 | (Has_Pragma_Inline_Always (Spec_Id) | |
2d180af1 YM |
3560 | or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining)) |
3561 | then | |
3562 | Build_Body_To_Inline (N, Spec_Id); | |
3563 | ||
3564 | -- In GNATprove mode, inline only when there is a separate subprogram | |
3565 | -- declaration for now, as inlining of subprogram bodies acting as | |
3566 | -- declarations, or subprogram stubs, are not supported by frontend | |
3567 | -- inlining. This inlining should occur after analysis of the body, | |
3568 | -- so that it is known whether the value of SPARK_Mode applicable to | |
3569 | -- the body, which can be defined by a pragma inside the body. | |
3570 | ||
3571 | elsif GNATprove_Mode | |
2d180af1 YM |
3572 | and then Full_Analysis |
3573 | and then not Inside_A_Generic | |
3574 | and then Present (Spec_Id) | |
3575 | and then | |
3576 | Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Declaration | |
3577 | and then Can_Be_Inlined_In_GNATprove_Mode (Spec_Id, Body_Id) | |
ac072cb2 | 3578 | and then not Body_Has_Contract |
84f4072a JM |
3579 | then |
3580 | Build_Body_To_Inline (N, Spec_Id); | |
3581 | end if; | |
3582 | ||
b94b6c56 | 3583 | -- New semantics (enabled by debug flag gnatd.k for testing) |
84f4072a | 3584 | |
2d180af1 | 3585 | elsif Expander_Active |
84f4072a JM |
3586 | and then Serious_Errors_Detected = 0 |
3587 | and then Present (Spec_Id) | |
3588 | and then Has_Pragma_Inline (Spec_Id) | |
996ae0b0 | 3589 | then |
84f4072a | 3590 | Check_And_Build_Body_To_Inline (N, Spec_Id, Body_Id); |
2d180af1 YM |
3591 | |
3592 | -- In GNATprove mode, inline only when there is a separate subprogram | |
3593 | -- declaration for now, as inlining of subprogram bodies acting as | |
3594 | -- declarations, or subprogram stubs, are not supported by frontend | |
3595 | -- inlining. This inlining should occur after analysis of the body, so | |
3596 | -- that it is known whether the value of SPARK_Mode applicable to the | |
3597 | -- body, which can be defined by a pragma inside the body. | |
3598 | ||
3599 | elsif GNATprove_Mode | |
2d180af1 YM |
3600 | and then Full_Analysis |
3601 | and then not Inside_A_Generic | |
3602 | and then Present (Spec_Id) | |
3603 | and then Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Declaration | |
3604 | and then Can_Be_Inlined_In_GNATprove_Mode (Spec_Id, Body_Id) | |
ac072cb2 | 3605 | and then not Body_Has_Contract |
2d180af1 YM |
3606 | then |
3607 | Check_And_Build_Body_To_Inline (N, Spec_Id, Body_Id); | |
996ae0b0 RK |
3608 | end if; |
3609 | ||
0ab80019 | 3610 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 3611 | -- of the specification we have to install the private withed units. |
21d27997 | 3612 | -- This holds for child units as well. |
9bc856dd AC |
3613 | |
3614 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 3615 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
3616 | then |
3617 | Install_Private_With_Clauses (Body_Id); | |
3618 | end if; | |
3619 | ||
ec4867fa ES |
3620 | Check_Anonymous_Return; |
3621 | ||
fdce4bb7 JM |
3622 | -- Set the Protected_Formal field of each extra formal of the protected |
3623 | -- subprogram to reference the corresponding extra formal of the | |
3624 | -- subprogram that implements it. For regular formals this occurs when | |
3625 | -- the protected subprogram's declaration is expanded, but the extra | |
3626 | -- formals don't get created until the subprogram is frozen. We need to | |
3627 | -- do this before analyzing the protected subprogram's body so that any | |
3628 | -- references to the original subprogram's extra formals will be changed | |
3629 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
3630 | ||
3631 | if Present (Spec_Id) | |
3632 | and then Is_Protected_Type (Scope (Spec_Id)) | |
3633 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
3634 | then | |
3635 | declare | |
3636 | Impl_Subp : constant Entity_Id := | |
3637 | Protected_Body_Subprogram (Spec_Id); | |
3638 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
3639 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
3640 | begin |
3641 | while Present (Prot_Ext_Formal) loop | |
3642 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 3643 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
3644 | Next_Formal_With_Extras (Prot_Ext_Formal); |
3645 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
3646 | end loop; | |
3647 | end; | |
3648 | end if; | |
3649 | ||
0868e09c | 3650 | -- Now we can go on to analyze the body |
996ae0b0 RK |
3651 | |
3652 | HSS := Handled_Statement_Sequence (N); | |
3653 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 3654 | |
f3d0f304 | 3655 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
3656 | -- for discriminals and privals and finally a declaration for the entry |
3657 | -- family index (if applicable). This form of early expansion is done | |
3658 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 | 3659 | -- references entities which were created during regular expansion. The |
3b8056a5 AC |
3660 | -- subprogram entity must come from source, and not be an internally |
3661 | -- generated subprogram. | |
21d27997 | 3662 | |
4460a9bc | 3663 | if Expander_Active |
21d27997 RD |
3664 | and then Present (Prot_Typ) |
3665 | and then Present (Spec_Id) | |
3b8056a5 | 3666 | and then Comes_From_Source (Spec_Id) |
21d27997 RD |
3667 | and then not Is_Eliminated (Spec_Id) |
3668 | then | |
3669 | Install_Private_Data_Declarations | |
3670 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
3671 | end if; | |
3672 | ||
5dcab3ca AC |
3673 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
3674 | -- may now appear in parameter and result profiles. Since the analysis | |
3675 | -- of a subprogram body may use the parameter and result profile of the | |
3676 | -- spec, swap any limited views with their non-limited counterpart. | |
3677 | ||
3678 | if Ada_Version >= Ada_2012 then | |
3679 | Exchange_Limited_Views (Spec_Id); | |
3680 | end if; | |
3681 | ||
c8a3028c AC |
3682 | -- Analyze any aspect specifications that appear on the subprogram body |
3683 | ||
3684 | if Has_Aspects (N) then | |
3685 | Analyze_Aspects_On_Body_Or_Stub; | |
3686 | end if; | |
3687 | ||
3688 | -- Deal with [refined] preconditions, postconditions, Contract_Cases, | |
3689 | -- invariants and predicates associated with the body and its spec. | |
3690 | -- Note that this is not pure expansion as Expand_Subprogram_Contract | |
3691 | -- prepares the contract assertions for generic subprograms or for ASIS. | |
3692 | -- Do not generate contract checks in SPARK mode. | |
3693 | ||
3694 | if not GNATprove_Mode then | |
3695 | Expand_Subprogram_Contract (N, Spec_Id, Body_Id); | |
3696 | end if; | |
3697 | ||
21d27997 RD |
3698 | -- Analyze the declarations (this call will analyze the precondition |
3699 | -- Check pragmas we prepended to the list, as well as the declaration | |
3700 | -- of the _Postconditions procedure). | |
3701 | ||
996ae0b0 | 3702 | Analyze_Declarations (Declarations (N)); |
21d27997 | 3703 | |
f90d14ac AC |
3704 | -- After declarations have been analyzed, the body has been set |
3705 | -- its final value of SPARK_Mode. Check that SPARK_Mode for body | |
3706 | -- is consistent with SPARK_Mode for spec. | |
3707 | ||
3708 | if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then | |
3709 | if Present (SPARK_Pragma (Spec_Id)) then | |
3710 | if Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Spec_Id)) = Off | |
3711 | and then | |
3712 | Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Body_Id)) = On | |
3713 | then | |
3714 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3715 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3716 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); | |
3717 | Error_Msg_NE | |
cf3e6845 | 3718 | ("\value Off was set for SPARK_Mode on&#", N, Spec_Id); |
f90d14ac AC |
3719 | end if; |
3720 | ||
3721 | elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then | |
3722 | null; | |
3723 | ||
3724 | else | |
3725 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3726 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3727 | Error_Msg_Sloc := Sloc (Spec_Id); | |
cf3e6845 | 3728 | Error_Msg_NE ("\no value was set for SPARK_Mode on&#", N, Spec_Id); |
f90d14ac AC |
3729 | end if; |
3730 | end if; | |
3731 | ||
ac43e11e AC |
3732 | -- If SPARK_Mode for body is not On, disable frontend inlining for this |
3733 | -- subprogram in GNATprove mode, as its body should not be analyzed. | |
3734 | ||
3735 | if SPARK_Mode /= On | |
3736 | and then GNATprove_Mode | |
ac43e11e AC |
3737 | and then Present (Spec_Id) |
3738 | and then Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Declaration | |
3739 | then | |
3740 | Set_Body_To_Inline (Parent (Parent (Spec_Id)), Empty); | |
4bd4bb7f | 3741 | Set_Is_Inlined_Always (Spec_Id, False); |
ac43e11e AC |
3742 | end if; |
3743 | ||
21d27997 RD |
3744 | -- Check completion, and analyze the statements |
3745 | ||
996ae0b0 | 3746 | Check_Completion; |
33931112 | 3747 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 3748 | Analyze (HSS); |
21d27997 RD |
3749 | |
3750 | -- Deal with end of scope processing for the body | |
3751 | ||
07fc65c4 | 3752 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
3753 | End_Scope; |
3754 | Check_Subprogram_Order (N); | |
c37bb106 | 3755 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
3756 | |
3757 | -- If we have a separate spec, then the analysis of the declarations | |
3758 | -- caused the entities in the body to be chained to the spec id, but | |
3759 | -- we want them chained to the body id. Only the formal parameters | |
3760 | -- end up chained to the spec id in this case. | |
3761 | ||
3762 | if Present (Spec_Id) then | |
3763 | ||
d39d6bb8 | 3764 | -- We must conform to the categorization of our spec |
996ae0b0 | 3765 | |
d39d6bb8 | 3766 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 3767 | |
d39d6bb8 RD |
3768 | -- And if this is a child unit, the parent units must conform |
3769 | ||
3770 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
3771 | Validate_Categorization_Dependency |
3772 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
3773 | end if; | |
3774 | ||
21d27997 RD |
3775 | -- Here is where we move entities from the spec to the body |
3776 | ||
3777 | -- Case where there are entities that stay with the spec | |
3778 | ||
3779 | if Present (Last_Real_Spec_Entity) then | |
3780 | ||
dbe36d67 AC |
3781 | -- No body entities (happens when the only real spec entities come |
3782 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
3783 | |
3784 | if No (Last_Entity (Body_Id)) then | |
3785 | Set_First_Entity | |
3786 | (Body_Id, Next_Entity (Last_Real_Spec_Entity)); | |
3787 | ||
3788 | -- Body entities present (formals), so chain stuff past them | |
3789 | ||
3790 | else | |
3791 | Set_Next_Entity | |
3792 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
3793 | end if; | |
3794 | ||
3795 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 3796 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
3797 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
3798 | ||
dbe36d67 AC |
3799 | -- Case where there are no spec entities, in this case there can be |
3800 | -- no body entities either, so just move everything. | |
996ae0b0 RK |
3801 | |
3802 | else | |
21d27997 | 3803 | pragma Assert (No (Last_Entity (Body_Id))); |
996ae0b0 RK |
3804 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
3805 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
3806 | Set_First_Entity (Spec_Id, Empty); | |
3807 | Set_Last_Entity (Spec_Id, Empty); | |
3808 | end if; | |
3809 | end if; | |
3810 | ||
7665e4bd | 3811 | Check_Missing_Return; |
996ae0b0 | 3812 | |
82c80734 | 3813 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
3814 | -- the body of the procedure. But first we deal with a special case |
3815 | -- where we want to modify this check. If the body of the subprogram | |
3816 | -- starts with a raise statement or its equivalent, or if the body | |
cf3e6845 AC |
3817 | -- consists entirely of a null statement, then it is pretty obvious that |
3818 | -- it is OK to not reference the parameters. For example, this might be | |
3819 | -- the following common idiom for a stubbed function: statement of the | |
3820 | -- procedure raises an exception. In particular this deals with the | |
3821 | -- common idiom of a stubbed function, which appears something like: | |
fbf5a39b AC |
3822 | |
3823 | -- function F (A : Integer) return Some_Type; | |
3824 | -- X : Some_Type; | |
3825 | -- begin | |
3826 | -- raise Program_Error; | |
3827 | -- return X; | |
3828 | -- end F; | |
3829 | ||
76a69663 ES |
3830 | -- Here the purpose of X is simply to satisfy the annoying requirement |
3831 | -- in Ada that there be at least one return, and we certainly do not | |
a90bd866 | 3832 | -- want to go posting warnings on X that it is not initialized. On |
76a69663 ES |
3833 | -- the other hand, if X is entirely unreferenced that should still |
3834 | -- get a warning. | |
3835 | ||
3836 | -- What we do is to detect these cases, and if we find them, flag the | |
3837 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
3838 | -- suppress unwanted warnings. For the case of the function stub above | |
3839 | -- we have a special test to set X as apparently assigned to suppress | |
3840 | -- the warning. | |
996ae0b0 RK |
3841 | |
3842 | declare | |
800621e0 | 3843 | Stm : Node_Id; |
996ae0b0 RK |
3844 | |
3845 | begin | |
0a36105d JM |
3846 | -- Skip initial labels (for one thing this occurs when we are in |
3847 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
3848 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 3849 | |
800621e0 | 3850 | Stm := First (Statements (HSS)); |
0a36105d JM |
3851 | while Nkind (Stm) = N_Label |
3852 | or else Nkind (Stm) in N_Push_xxx_Label | |
3853 | loop | |
996ae0b0 | 3854 | Next (Stm); |
0a36105d | 3855 | end loop; |
996ae0b0 | 3856 | |
fbf5a39b AC |
3857 | -- Do the test on the original statement before expansion |
3858 | ||
3859 | declare | |
3860 | Ostm : constant Node_Id := Original_Node (Stm); | |
3861 | ||
3862 | begin | |
76a69663 | 3863 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
3864 | |
3865 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
3866 | Set_Trivial_Subprogram (Stm); |
3867 | ||
f3d57416 | 3868 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
3869 | |
3870 | elsif Nkind (Stm) = N_Null_Statement | |
3871 | and then Comes_From_Source (Stm) | |
3872 | and then No (Next (Stm)) | |
3873 | then | |
3874 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
3875 | |
3876 | -- Check for explicit call cases which likely raise an exception | |
3877 | ||
3878 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
3879 | if Is_Entity_Name (Name (Ostm)) then | |
3880 | declare | |
3881 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
3882 | ||
3883 | begin | |
3884 | -- If the procedure is marked No_Return, then likely it | |
3885 | -- raises an exception, but in any case it is not coming | |
76a69663 | 3886 | -- back here, so turn on the flag. |
fbf5a39b | 3887 | |
f46faa08 AC |
3888 | if Present (Ent) |
3889 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
3890 | and then No_Return (Ent) |
3891 | then | |
76a69663 | 3892 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
3893 | end if; |
3894 | end; | |
3895 | end if; | |
3896 | end if; | |
3897 | end; | |
996ae0b0 RK |
3898 | end; |
3899 | ||
3900 | -- Check for variables that are never modified | |
3901 | ||
3902 | declare | |
3903 | E1, E2 : Entity_Id; | |
3904 | ||
3905 | begin | |
fbf5a39b | 3906 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
3907 | -- flags from out parameters to the corresponding entities in the |
3908 | -- body. The reason we do that is we want to post error flags on | |
3909 | -- the body entities, not the spec entities. | |
3910 | ||
3911 | if Present (Spec_Id) then | |
3912 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
3913 | while Present (E1) loop |
3914 | if Ekind (E1) = E_Out_Parameter then | |
3915 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 3916 | while Present (E2) loop |
996ae0b0 RK |
3917 | exit when Chars (E1) = Chars (E2); |
3918 | Next_Entity (E2); | |
3919 | end loop; | |
3920 | ||
fbf5a39b AC |
3921 | if Present (E2) then |
3922 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
3923 | end if; | |
996ae0b0 RK |
3924 | end if; |
3925 | ||
3926 | Next_Entity (E1); | |
3927 | end loop; | |
3928 | end if; | |
3929 | ||
2aca76d6 | 3930 | -- Check references in body |
0868e09c | 3931 | |
2aca76d6 | 3932 | Check_References (Body_Id); |
996ae0b0 | 3933 | end; |
b1b543d2 | 3934 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 | 3935 | |
5afe5d2d HK |
3936 | --------------------------------- |
3937 | -- Analyze_Subprogram_Contract -- | |
3938 | --------------------------------- | |
3939 | ||
3940 | procedure Analyze_Subprogram_Contract (Subp : Entity_Id) is | |
36eef04a AC |
3941 | Items : constant Node_Id := Contract (Subp); |
3942 | Case_Prag : Node_Id := Empty; | |
3943 | Depends : Node_Id := Empty; | |
3944 | Global : Node_Id := Empty; | |
c61ef416 | 3945 | Mode : SPARK_Mode_Type; |
36eef04a AC |
3946 | Nam : Name_Id; |
3947 | Post_Prag : Node_Id := Empty; | |
3948 | Prag : Node_Id; | |
3949 | Seen_In_Case : Boolean := False; | |
3950 | Seen_In_Post : Boolean := False; | |
5afe5d2d HK |
3951 | |
3952 | begin | |
fc999c5d RD |
3953 | -- Due to the timing of contract analysis, delayed pragmas may be |
3954 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
3955 | -- context. To remedy this, restore the original SPARK_Mode of the | |
3956 | -- related subprogram body. | |
3957 | ||
c61ef416 AC |
3958 | Save_SPARK_Mode_And_Set (Subp, Mode); |
3959 | ||
5afe5d2d HK |
3960 | if Present (Items) then |
3961 | ||
3962 | -- Analyze pre- and postconditions | |
3963 | ||
3964 | Prag := Pre_Post_Conditions (Items); | |
3965 | while Present (Prag) loop | |
ea3c0651 | 3966 | Analyze_Pre_Post_Condition_In_Decl_Part (Prag, Subp); |
5afe5d2d HK |
3967 | |
3968 | -- Verify whether a postcondition mentions attribute 'Result and | |
3969 | -- its expression introduces a post-state. | |
3970 | ||
3971 | if Warn_On_Suspicious_Contract | |
3972 | and then Pragma_Name (Prag) = Name_Postcondition | |
3973 | then | |
36eef04a AC |
3974 | Post_Prag := Prag; |
3975 | Check_Result_And_Post_State (Prag, Seen_In_Post); | |
5afe5d2d HK |
3976 | end if; |
3977 | ||
3978 | Prag := Next_Pragma (Prag); | |
3979 | end loop; | |
3980 | ||
3981 | -- Analyze contract-cases and test-cases | |
3982 | ||
3983 | Prag := Contract_Test_Cases (Items); | |
3984 | while Present (Prag) loop | |
ea3c0651 AC |
3985 | Nam := Pragma_Name (Prag); |
3986 | ||
3987 | if Nam = Name_Contract_Cases then | |
5afe5d2d HK |
3988 | Analyze_Contract_Cases_In_Decl_Part (Prag); |
3989 | ||
3990 | -- Verify whether contract-cases mention attribute 'Result and | |
3991 | -- its expression introduces a post-state. Perform the check | |
3992 | -- only when the pragma is legal. | |
3993 | ||
3994 | if Warn_On_Suspicious_Contract | |
3995 | and then not Error_Posted (Prag) | |
3996 | then | |
36eef04a AC |
3997 | Case_Prag := Prag; |
3998 | Check_Result_And_Post_State (Prag, Seen_In_Case); | |
5afe5d2d HK |
3999 | end if; |
4000 | ||
4001 | else | |
ea3c0651 | 4002 | pragma Assert (Nam = Name_Test_Case); |
5afe5d2d HK |
4003 | Analyze_Test_Case_In_Decl_Part (Prag, Subp); |
4004 | end if; | |
4005 | ||
4006 | Prag := Next_Pragma (Prag); | |
4007 | end loop; | |
4008 | ||
4009 | -- Analyze classification pragmas | |
4010 | ||
6c3c671e | 4011 | Prag := Classifications (Items); |
5afe5d2d | 4012 | while Present (Prag) loop |
ea3c0651 AC |
4013 | Nam := Pragma_Name (Prag); |
4014 | ||
4015 | if Nam = Name_Depends then | |
54e28df2 HK |
4016 | Depends := Prag; |
4017 | else pragma Assert (Nam = Name_Global); | |
4018 | Global := Prag; | |
5afe5d2d HK |
4019 | end if; |
4020 | ||
4021 | Prag := Next_Pragma (Prag); | |
4022 | end loop; | |
54e28df2 HK |
4023 | |
4024 | -- Analyze Global first as Depends may mention items classified in | |
4025 | -- the global categorization. | |
4026 | ||
4027 | if Present (Global) then | |
4028 | Analyze_Global_In_Decl_Part (Global); | |
4029 | end if; | |
4030 | ||
4031 | -- Depends must be analyzed after Global in order to see the modes of | |
4032 | -- all global items. | |
4033 | ||
4034 | if Present (Depends) then | |
4035 | Analyze_Depends_In_Decl_Part (Depends); | |
4036 | end if; | |
5afe5d2d HK |
4037 | end if; |
4038 | ||
36eef04a | 4039 | -- Emit an error when neither the postconditions nor the contract-cases |
5afe5d2d HK |
4040 | -- mention attribute 'Result in the context of a function. |
4041 | ||
4042 | if Warn_On_Suspicious_Contract | |
4043 | and then Ekind_In (Subp, E_Function, E_Generic_Function) | |
5afe5d2d | 4044 | then |
36eef04a AC |
4045 | if Present (Case_Prag) |
4046 | and then not Seen_In_Case | |
4047 | and then Present (Post_Prag) | |
4048 | and then not Seen_In_Post | |
4049 | then | |
5afe5d2d HK |
4050 | Error_Msg_N |
4051 | ("neither function postcondition nor contract cases mention " | |
36eef04a | 4052 | & "result?T?", Post_Prag); |
5afe5d2d | 4053 | |
36eef04a | 4054 | elsif Present (Case_Prag) and then not Seen_In_Case then |
5afe5d2d | 4055 | Error_Msg_N |
36eef04a | 4056 | ("contract cases do not mention result?T?", Case_Prag); |
5afe5d2d | 4057 | |
f660fba6 AC |
4058 | -- OK if we have at least one IN OUT parameter |
4059 | ||
36eef04a | 4060 | elsif Present (Post_Prag) and then not Seen_In_Post then |
f660fba6 AC |
4061 | declare |
4062 | F : Entity_Id; | |
4063 | begin | |
4064 | F := First_Formal (Subp); | |
4065 | while Present (F) loop | |
4066 | if Ekind (F) = E_In_Out_Parameter then | |
4067 | return; | |
4068 | else | |
4069 | Next_Formal (F); | |
4070 | end if; | |
4071 | end loop; | |
4072 | end; | |
4073 | ||
4074 | -- If no in-out parameters and no mention of Result, the contract | |
4075 | -- is certainly suspicious. | |
4076 | ||
5afe5d2d | 4077 | Error_Msg_N |
36eef04a | 4078 | ("function postcondition does not mention result?T?", Post_Prag); |
5afe5d2d HK |
4079 | end if; |
4080 | end if; | |
c61ef416 | 4081 | |
fc999c5d RD |
4082 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
4083 | -- pragmas have been analyzed. | |
4084 | ||
c61ef416 | 4085 | Restore_SPARK_Mode (Mode); |
5afe5d2d HK |
4086 | end Analyze_Subprogram_Contract; |
4087 | ||
996ae0b0 RK |
4088 | ------------------------------------ |
4089 | -- Analyze_Subprogram_Declaration -- | |
4090 | ------------------------------------ | |
4091 | ||
4092 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
579847c2 | 4093 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc | 4094 | Designator : Entity_Id; |
579847c2 | 4095 | |
4d8f3296 ES |
4096 | Is_Completion : Boolean; |
4097 | -- Indicates whether a null procedure declaration is a completion | |
996ae0b0 RK |
4098 | |
4099 | begin | |
2ba431e5 | 4100 | -- Null procedures are not allowed in SPARK |
daec8eeb | 4101 | |
fe5d3068 | 4102 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
4103 | and then Null_Present (Specification (N)) |
4104 | then | |
2ba431e5 | 4105 | Check_SPARK_Restriction ("null procedure is not allowed", N); |
718deaf1 | 4106 | |
4d8f3296 ES |
4107 | if Is_Protected_Type (Current_Scope) then |
4108 | Error_Msg_N ("protected operation cannot be a null procedure", N); | |
4109 | end if; | |
718deaf1 | 4110 | |
4d8f3296 | 4111 | Analyze_Null_Procedure (N, Is_Completion); |
718deaf1 | 4112 | |
4d8f3296 | 4113 | if Is_Completion then |
718deaf1 | 4114 | |
4d8f3296 | 4115 | -- The null procedure acts as a body, nothing further is needed. |
5d5832bc | 4116 | |
4d8f3296 | 4117 | return; |
5d5832bc AC |
4118 | end if; |
4119 | end if; | |
4120 | ||
beacce02 | 4121 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
4122 | |
4123 | -- A reference may already have been generated for the unit name, in | |
4124 | -- which case the following call is redundant. However it is needed for | |
4125 | -- declarations that are the rewriting of an expression function. | |
4126 | ||
5d5832bc AC |
4127 | Generate_Definition (Designator); |
4128 | ||
f90d14ac AC |
4129 | -- Set SPARK mode from current context (may be overwritten later with |
4130 | -- explicit pragma). | |
4a854847 | 4131 | |
f90d14ac AC |
4132 | Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
4133 | Set_SPARK_Pragma_Inherited (Designator, True); | |
579847c2 | 4134 | |
b1b543d2 BD |
4135 | if Debug_Flag_C then |
4136 | Write_Str ("==> subprogram spec "); | |
4137 | Write_Name (Chars (Designator)); | |
4138 | Write_Str (" from "); | |
4139 | Write_Location (Sloc (N)); | |
4140 | Write_Eol; | |
4141 | Indent; | |
4142 | end if; | |
4143 | ||
996ae0b0 | 4144 | Validate_RCI_Subprogram_Declaration (N); |
996ae0b0 RK |
4145 | New_Overloaded_Entity (Designator); |
4146 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 4147 | |
cf3e6845 AC |
4148 | -- If the type of the first formal of the current subprogram is a non- |
4149 | -- generic tagged private type, mark the subprogram as being a private | |
4150 | -- primitive. Ditto if this is a function with controlling result, and | |
4151 | -- the return type is currently private. In both cases, the type of the | |
4152 | -- controlling argument or result must be in the current scope for the | |
4153 | -- operation to be primitive. | |
6ca063eb AC |
4154 | |
4155 | if Has_Controlling_Result (Designator) | |
4156 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 4157 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
4158 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
4159 | then | |
4160 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 4161 | |
6ca063eb | 4162 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
4163 | declare |
4164 | Formal_Typ : constant Entity_Id := | |
4165 | Etype (First_Formal (Designator)); | |
4166 | begin | |
4167 | Set_Is_Private_Primitive (Designator, | |
4168 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 4169 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
4170 | and then Is_Private_Type (Formal_Typ) |
4171 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
4172 | end; | |
4173 | end if; | |
4174 | ||
ec4867fa ES |
4175 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
4176 | -- or null. | |
4177 | ||
0791fbe9 | 4178 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
4179 | and then Comes_From_Source (N) |
4180 | and then Is_Dispatching_Operation (Designator) | |
4181 | then | |
4182 | declare | |
4183 | E : Entity_Id; | |
4184 | Etyp : Entity_Id; | |
4185 | ||
4186 | begin | |
4187 | if Has_Controlling_Result (Designator) then | |
4188 | Etyp := Etype (Designator); | |
4189 | ||
4190 | else | |
4191 | E := First_Entity (Designator); | |
4192 | while Present (E) | |
4193 | and then Is_Formal (E) | |
4194 | and then not Is_Controlling_Formal (E) | |
4195 | loop | |
4196 | Next_Entity (E); | |
4197 | end loop; | |
4198 | ||
4199 | Etyp := Etype (E); | |
4200 | end if; | |
4201 | ||
4202 | if Is_Access_Type (Etyp) then | |
4203 | Etyp := Directly_Designated_Type (Etyp); | |
4204 | end if; | |
4205 | ||
4206 | if Is_Interface (Etyp) | |
f937473f | 4207 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa | 4208 | and then not (Ekind (Designator) = E_Procedure |
8fde064e | 4209 | and then Null_Present (Specification (N))) |
ec4867fa ES |
4210 | then |
4211 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
4212 | |
4213 | -- Specialize error message based on procedures vs. functions, | |
4214 | -- since functions can't be null subprograms. | |
4215 | ||
4216 | if Ekind (Designator) = E_Procedure then | |
4217 | Error_Msg_N | |
4218 | ("interface procedure % must be abstract or null", N); | |
4219 | else | |
3f80a182 AC |
4220 | Error_Msg_N |
4221 | ("interface function % must be abstract", N); | |
033eaf85 | 4222 | end if; |
ec4867fa ES |
4223 | end if; |
4224 | end; | |
4225 | end if; | |
4226 | ||
fbf5a39b AC |
4227 | -- What is the following code for, it used to be |
4228 | ||
4229 | -- ??? Set_Suppress_Elaboration_Checks | |
4230 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
4231 | ||
4232 | -- The following seems equivalent, but a bit dubious | |
4233 | ||
4234 | if Elaboration_Checks_Suppressed (Designator) then | |
4235 | Set_Kill_Elaboration_Checks (Designator); | |
4236 | end if; | |
996ae0b0 | 4237 | |
8fde064e | 4238 | if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then |
fbf5a39b | 4239 | Set_Categorization_From_Scope (Designator, Scop); |
8fde064e | 4240 | |
996ae0b0 | 4241 | else |
e895b435 | 4242 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 4243 | |
0a36105d | 4244 | Push_Scope (Designator); |
996ae0b0 RK |
4245 | Set_Categorization_From_Pragmas (N); |
4246 | Validate_Categorization_Dependency (N, Designator); | |
4247 | Pop_Scope; | |
4248 | end if; | |
4249 | ||
4250 | -- For a compilation unit, set body required. This flag will only be | |
4251 | -- reset if a valid Import or Interface pragma is processed later on. | |
4252 | ||
4253 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
4254 | Set_Body_Required (Parent (N), True); | |
758c442c | 4255 | |
0791fbe9 | 4256 | if Ada_Version >= Ada_2005 |
758c442c GD |
4257 | and then Nkind (Specification (N)) = N_Procedure_Specification |
4258 | and then Null_Present (Specification (N)) | |
4259 | then | |
4260 | Error_Msg_N | |
4261 | ("null procedure cannot be declared at library level", N); | |
4262 | end if; | |
996ae0b0 RK |
4263 | end if; |
4264 | ||
fbf5a39b | 4265 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 4266 | Check_Eliminated (Designator); |
fbf5a39b | 4267 | |
b1b543d2 BD |
4268 | if Debug_Flag_C then |
4269 | Outdent; | |
4270 | Write_Str ("<== subprogram spec "); | |
4271 | Write_Name (Chars (Designator)); | |
4272 | Write_Str (" from "); | |
4273 | Write_Location (Sloc (N)); | |
4274 | Write_Eol; | |
4275 | end if; | |
0f1a6a0b | 4276 | |
1a265e78 AC |
4277 | if Is_Protected_Type (Current_Scope) then |
4278 | ||
4279 | -- Indicate that this is a protected operation, because it may be | |
4280 | -- used in subsequent declarations within the protected type. | |
4281 | ||
4282 | Set_Convention (Designator, Convention_Protected); | |
4283 | end if; | |
4284 | ||
beacce02 | 4285 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
4286 | |
4287 | if Has_Aspects (N) then | |
4288 | Analyze_Aspect_Specifications (N, Designator); | |
4289 | end if; | |
996ae0b0 RK |
4290 | end Analyze_Subprogram_Declaration; |
4291 | ||
fbf5a39b AC |
4292 | -------------------------------------- |
4293 | -- Analyze_Subprogram_Specification -- | |
4294 | -------------------------------------- | |
4295 | ||
4296 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
4297 | -- declaration). This procedure is called to analyze the specification in | |
4298 | -- both subprogram bodies and subprogram declarations (specs). | |
4299 | ||
4300 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
4301 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 4302 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 4303 | |
758c442c GD |
4304 | -- Start of processing for Analyze_Subprogram_Specification |
4305 | ||
fbf5a39b | 4306 | begin |
2ba431e5 | 4307 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 4308 | |
db72f10a AC |
4309 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
4310 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
4311 | then | |
2ba431e5 | 4312 | Check_SPARK_Restriction ("user-defined operator is not allowed", N); |
38171f43 AC |
4313 | end if; |
4314 | ||
31af8899 AC |
4315 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
4316 | -- specification comes from an expression function, because it may be | |
4317 | -- the completion of a previous declaration. It is is not, the cross- | |
4318 | -- reference entry will be emitted for the new subprogram declaration. | |
4319 | ||
4320 | if Nkind (Parent (N)) /= N_Expression_Function then | |
4321 | Generate_Definition (Designator); | |
4322 | end if; | |
38171f43 | 4323 | |
dac3bede | 4324 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
fbf5a39b AC |
4325 | |
4326 | if Nkind (N) = N_Function_Specification then | |
4327 | Set_Ekind (Designator, E_Function); | |
4328 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
4329 | else |
4330 | Set_Ekind (Designator, E_Procedure); | |
4331 | Set_Etype (Designator, Standard_Void_Type); | |
4332 | end if; | |
4333 | ||
4bd4bb7f AC |
4334 | -- Flag Is_Inlined_Always is True by default, and reversed to False for |
4335 | -- those subprograms which could be inlined in GNATprove mode (because | |
4336 | -- Body_To_Inline is non-Empty) but cannot be inlined. | |
4337 | ||
4338 | if GNATprove_Mode then | |
4339 | Set_Is_Inlined_Always (Designator); | |
4340 | end if; | |
4341 | ||
800621e0 | 4342 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
4343 | |
4344 | Set_Scope (Designator, Current_Scope); | |
4345 | ||
fbf5a39b | 4346 | if Present (Formals) then |
0a36105d | 4347 | Push_Scope (Designator); |
fbf5a39b | 4348 | Process_Formals (Formals, N); |
758c442c | 4349 | |
0929eaeb AC |
4350 | -- Check dimensions in N for formals with default expression |
4351 | ||
4352 | Analyze_Dimension_Formals (N, Formals); | |
4353 | ||
a38ff9b1 ES |
4354 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
4355 | -- inherited interface operation, and the controlling type is | |
4356 | -- a synchronized type, replace the type with its corresponding | |
4357 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
4358 | -- Same processing for an access parameter whose designated type is |
4359 | -- derived from a synchronized interface. | |
758c442c | 4360 | |
0791fbe9 | 4361 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
4362 | declare |
4363 | Formal : Entity_Id; | |
4364 | Formal_Typ : Entity_Id; | |
4365 | Rec_Typ : Entity_Id; | |
69cb258c | 4366 | Desig_Typ : Entity_Id; |
0a36105d | 4367 | |
d44202ba HK |
4368 | begin |
4369 | Formal := First_Formal (Designator); | |
4370 | while Present (Formal) loop | |
4371 | Formal_Typ := Etype (Formal); | |
0a36105d | 4372 | |
d44202ba HK |
4373 | if Is_Concurrent_Type (Formal_Typ) |
4374 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4375 | then | |
4376 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
4377 | ||
4378 | if Present (Interfaces (Rec_Typ)) then | |
4379 | Set_Etype (Formal, Rec_Typ); | |
4380 | end if; | |
69cb258c AC |
4381 | |
4382 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
4383 | Desig_Typ := Designated_Type (Formal_Typ); | |
4384 | ||
4385 | if Is_Concurrent_Type (Desig_Typ) | |
4386 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
4387 | then | |
4388 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
4389 | ||
4390 | if Present (Interfaces (Rec_Typ)) then | |
4391 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
4392 | end if; | |
4393 | end if; | |
d44202ba HK |
4394 | end if; |
4395 | ||
4396 | Next_Formal (Formal); | |
4397 | end loop; | |
4398 | end; | |
758c442c GD |
4399 | end if; |
4400 | ||
fbf5a39b | 4401 | End_Scope; |
82c80734 | 4402 | |
b66c3ff4 AC |
4403 | -- The subprogram scope is pushed and popped around the processing of |
4404 | -- the return type for consistency with call above to Process_Formals | |
4405 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
4406 | -- itype created for the return type will be associated with the proper | |
4407 | -- scope. | |
4408 | ||
82c80734 | 4409 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 4410 | Push_Scope (Designator); |
82c80734 | 4411 | Analyze_Return_Type (N); |
b66c3ff4 | 4412 | End_Scope; |
fbf5a39b AC |
4413 | end if; |
4414 | ||
e606088a AC |
4415 | -- Function case |
4416 | ||
fbf5a39b | 4417 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
4418 | |
4419 | -- Deal with operator symbol case | |
4420 | ||
fbf5a39b AC |
4421 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
4422 | Valid_Operator_Definition (Designator); | |
4423 | end if; | |
4424 | ||
4425 | May_Need_Actuals (Designator); | |
4426 | ||
fe63b1b1 ES |
4427 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
4428 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
4429 | -- declarations, where abstractness is inherited, and to subprogram |
4430 | -- bodies generated for stream operations, which become renamings as | |
4431 | -- bodies. | |
2bfb1b72 | 4432 | |
fe63b1b1 ES |
4433 | -- In case of primitives associated with abstract interface types |
4434 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 4435 | |
1adaea16 | 4436 | if not Nkind_In (Original_Node (Parent (N)), |
3f80a182 AC |
4437 | N_Subprogram_Renaming_Declaration, |
4438 | N_Abstract_Subprogram_Declaration, | |
4439 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 4440 | then |
2e79de51 AC |
4441 | if Is_Abstract_Type (Etype (Designator)) |
4442 | and then not Is_Interface (Etype (Designator)) | |
4443 | then | |
4444 | Error_Msg_N | |
4445 | ("function that returns abstract type must be abstract", N); | |
4446 | ||
e606088a | 4447 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
4448 | -- access result whose designated type is abstract. |
4449 | ||
4450 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
4451 | and then | |
4452 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
4453 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 4454 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
4455 | then |
4456 | Error_Msg_N ("function whose access result designates " | |
3f80a182 | 4457 | & "abstract type must be abstract", N); |
2e79de51 | 4458 | end if; |
fbf5a39b AC |
4459 | end if; |
4460 | end if; | |
4461 | ||
4462 | return Designator; | |
4463 | end Analyze_Subprogram_Specification; | |
4464 | ||
996ae0b0 RK |
4465 | ----------------------- |
4466 | -- Check_Conformance -- | |
4467 | ----------------------- | |
4468 | ||
4469 | procedure Check_Conformance | |
41251c60 JM |
4470 | (New_Id : Entity_Id; |
4471 | Old_Id : Entity_Id; | |
4472 | Ctype : Conformance_Type; | |
4473 | Errmsg : Boolean; | |
4474 | Conforms : out Boolean; | |
4475 | Err_Loc : Node_Id := Empty; | |
4476 | Get_Inst : Boolean := False; | |
4477 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 4478 | is |
996ae0b0 | 4479 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
4480 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
4481 | -- If Errmsg is True, then processing continues to post an error message | |
4482 | -- for conformance error on given node. Two messages are output. The | |
4483 | -- first message points to the previous declaration with a general "no | |
4484 | -- conformance" message. The second is the detailed reason, supplied as | |
4485 | -- Msg. The parameter N provide information for a possible & insertion | |
4486 | -- in the message, and also provides the location for posting the | |
4487 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
4488 | |
4489 | ----------------------- | |
4490 | -- Conformance_Error -- | |
4491 | ----------------------- | |
4492 | ||
4493 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
4494 | Enode : Node_Id; | |
4495 | ||
4496 | begin | |
4497 | Conforms := False; | |
4498 | ||
4499 | if Errmsg then | |
4500 | if No (Err_Loc) then | |
4501 | Enode := N; | |
4502 | else | |
4503 | Enode := Err_Loc; | |
4504 | end if; | |
4505 | ||
4506 | Error_Msg_Sloc := Sloc (Old_Id); | |
4507 | ||
4508 | case Ctype is | |
4509 | when Type_Conformant => | |
483c78cb | 4510 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
4511 | ("not type conformant with declaration#!", Enode); |
4512 | ||
4513 | when Mode_Conformant => | |
19590d70 | 4514 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4515 | Error_Msg_N |
19590d70 GD |
4516 | ("not mode conformant with operation inherited#!", |
4517 | Enode); | |
4518 | else | |
ed2233dc | 4519 | Error_Msg_N |
19590d70 GD |
4520 | ("not mode conformant with declaration#!", Enode); |
4521 | end if; | |
996ae0b0 RK |
4522 | |
4523 | when Subtype_Conformant => | |
19590d70 | 4524 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4525 | Error_Msg_N |
19590d70 GD |
4526 | ("not subtype conformant with operation inherited#!", |
4527 | Enode); | |
4528 | else | |
ed2233dc | 4529 | Error_Msg_N |
19590d70 GD |
4530 | ("not subtype conformant with declaration#!", Enode); |
4531 | end if; | |
996ae0b0 RK |
4532 | |
4533 | when Fully_Conformant => | |
19590d70 | 4534 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 4535 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4536 | ("not fully conformant with operation inherited#!", |
4537 | Enode); | |
4538 | else | |
483c78cb | 4539 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4540 | ("not fully conformant with declaration#!", Enode); |
4541 | end if; | |
996ae0b0 RK |
4542 | end case; |
4543 | ||
4544 | Error_Msg_NE (Msg, Enode, N); | |
4545 | end if; | |
4546 | end Conformance_Error; | |
4547 | ||
ec4867fa ES |
4548 | -- Local Variables |
4549 | ||
4550 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
4551 | New_Type : constant Entity_Id := Etype (New_Id); | |
4552 | Old_Formal : Entity_Id; | |
4553 | New_Formal : Entity_Id; | |
4554 | Access_Types_Match : Boolean; | |
4555 | Old_Formal_Base : Entity_Id; | |
4556 | New_Formal_Base : Entity_Id; | |
4557 | ||
996ae0b0 RK |
4558 | -- Start of processing for Check_Conformance |
4559 | ||
4560 | begin | |
4561 | Conforms := True; | |
4562 | ||
82c80734 RD |
4563 | -- We need a special case for operators, since they don't appear |
4564 | -- explicitly. | |
996ae0b0 RK |
4565 | |
4566 | if Ctype = Type_Conformant then | |
4567 | if Ekind (New_Id) = E_Operator | |
4568 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
4569 | then | |
4570 | return; | |
4571 | end if; | |
4572 | end if; | |
4573 | ||
4574 | -- If both are functions/operators, check return types conform | |
4575 | ||
4576 | if Old_Type /= Standard_Void_Type | |
4577 | and then New_Type /= Standard_Void_Type | |
4578 | then | |
fceeaab6 ES |
4579 | |
4580 | -- If we are checking interface conformance we omit controlling | |
4581 | -- arguments and result, because we are only checking the conformance | |
4582 | -- of the remaining parameters. | |
4583 | ||
4584 | if Has_Controlling_Result (Old_Id) | |
4585 | and then Has_Controlling_Result (New_Id) | |
4586 | and then Skip_Controlling_Formals | |
4587 | then | |
4588 | null; | |
4589 | ||
4590 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
7f568bfa AC |
4591 | if Ctype >= Subtype_Conformant |
4592 | and then not Predicates_Match (Old_Type, New_Type) | |
4593 | then | |
4594 | Conformance_Error | |
4595 | ("\predicate of return type does not match!", New_Id); | |
4596 | else | |
4597 | Conformance_Error | |
4598 | ("\return type does not match!", New_Id); | |
4599 | end if; | |
4600 | ||
996ae0b0 RK |
4601 | return; |
4602 | end if; | |
4603 | ||
41251c60 | 4604 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 4605 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 4606 | |
0791fbe9 | 4607 | if Ada_Version >= Ada_2005 |
41251c60 JM |
4608 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
4609 | and then | |
8fde064e AC |
4610 | (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
4611 | or else Is_Access_Constant (Etype (Old_Type)) /= | |
4612 | Is_Access_Constant (Etype (New_Type))) | |
41251c60 | 4613 | then |
5d37ba92 | 4614 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
4615 | return; |
4616 | end if; | |
4617 | ||
996ae0b0 RK |
4618 | -- If either is a function/operator and the other isn't, error |
4619 | ||
4620 | elsif Old_Type /= Standard_Void_Type | |
4621 | or else New_Type /= Standard_Void_Type | |
4622 | then | |
5d37ba92 | 4623 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
4624 | return; |
4625 | end if; | |
4626 | ||
0a36105d | 4627 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
4628 | -- If this is a renaming as body, refine error message to indicate that |
4629 | -- the conflict is with the original declaration. If the entity is not | |
4630 | -- frozen, the conventions don't have to match, the one of the renamed | |
4631 | -- entity is inherited. | |
4632 | ||
4633 | if Ctype >= Subtype_Conformant then | |
996ae0b0 | 4634 | if Convention (Old_Id) /= Convention (New_Id) then |
996ae0b0 RK |
4635 | if not Is_Frozen (New_Id) then |
4636 | null; | |
4637 | ||
4638 | elsif Present (Err_Loc) | |
4639 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
4640 | and then Present (Corresponding_Spec (Err_Loc)) | |
4641 | then | |
4642 | Error_Msg_Name_1 := Chars (New_Id); | |
4643 | Error_Msg_Name_2 := | |
4644 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 4645 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
4646 | |
4647 | else | |
5d37ba92 | 4648 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
4649 | end if; |
4650 | ||
4651 | return; | |
4652 | ||
4653 | elsif Is_Formal_Subprogram (Old_Id) | |
4654 | or else Is_Formal_Subprogram (New_Id) | |
4655 | then | |
5d37ba92 | 4656 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 RK |
4657 | return; |
4658 | end if; | |
4659 | end if; | |
4660 | ||
4661 | -- Deal with parameters | |
4662 | ||
4663 | -- Note: we use the entity information, rather than going directly | |
4664 | -- to the specification in the tree. This is not only simpler, but | |
4665 | -- absolutely necessary for some cases of conformance tests between | |
a90bd866 | 4666 | -- operators, where the declaration tree simply does not exist. |
996ae0b0 RK |
4667 | |
4668 | Old_Formal := First_Formal (Old_Id); | |
4669 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 4670 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
4671 | if Is_Controlling_Formal (Old_Formal) |
4672 | and then Is_Controlling_Formal (New_Formal) | |
4673 | and then Skip_Controlling_Formals | |
4674 | then | |
a2dc5812 AC |
4675 | -- The controlling formals will have different types when |
4676 | -- comparing an interface operation with its match, but both | |
4677 | -- or neither must be access parameters. | |
4678 | ||
4679 | if Is_Access_Type (Etype (Old_Formal)) | |
4680 | = | |
4681 | Is_Access_Type (Etype (New_Formal)) | |
4682 | then | |
4683 | goto Skip_Controlling_Formal; | |
4684 | else | |
4685 | Conformance_Error | |
4686 | ("\access parameter does not match!", New_Formal); | |
4687 | end if; | |
41251c60 JM |
4688 | end if; |
4689 | ||
21791d97 | 4690 | -- Ada 2012: Mode conformance also requires that formal parameters |
2a290fec AC |
4691 | -- be both aliased, or neither. |
4692 | ||
21791d97 | 4693 | if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
2a290fec AC |
4694 | if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
4695 | Conformance_Error | |
4696 | ("\aliased parameter mismatch!", New_Formal); | |
4697 | end if; | |
4698 | end if; | |
4699 | ||
fbf5a39b AC |
4700 | if Ctype = Fully_Conformant then |
4701 | ||
4702 | -- Names must match. Error message is more accurate if we do | |
4703 | -- this before checking that the types of the formals match. | |
4704 | ||
4705 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
5d37ba92 | 4706 | Conformance_Error ("\name & does not match!", New_Formal); |
fbf5a39b AC |
4707 | |
4708 | -- Set error posted flag on new formal as well to stop | |
4709 | -- junk cascaded messages in some cases. | |
4710 | ||
4711 | Set_Error_Posted (New_Formal); | |
4712 | return; | |
4713 | end if; | |
40b93859 RD |
4714 | |
4715 | -- Null exclusion must match | |
4716 | ||
4717 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
4718 | /= | |
4719 | Null_Exclusion_Present (Parent (New_Formal)) | |
4720 | then | |
4721 | -- Only give error if both come from source. This should be | |
4722 | -- investigated some time, since it should not be needed ??? | |
4723 | ||
4724 | if Comes_From_Source (Old_Formal) | |
4725 | and then | |
4726 | Comes_From_Source (New_Formal) | |
4727 | then | |
4728 | Conformance_Error | |
4729 | ("\null exclusion for & does not match", New_Formal); | |
4730 | ||
4731 | -- Mark error posted on the new formal to avoid duplicated | |
4732 | -- complaint about types not matching. | |
4733 | ||
4734 | Set_Error_Posted (New_Formal); | |
4735 | end if; | |
4736 | end if; | |
fbf5a39b | 4737 | end if; |
996ae0b0 | 4738 | |
ec4867fa ES |
4739 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
4740 | -- case occurs whenever a subprogram is being renamed and one of its | |
4741 | -- parameters imposes a null exclusion. For example: | |
4742 | ||
4743 | -- type T is null record; | |
4744 | -- type Acc_T is access T; | |
4745 | -- subtype Acc_T_Sub is Acc_T; | |
4746 | ||
4747 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
4748 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
4749 | -- renames P; | |
4750 | ||
4751 | Old_Formal_Base := Etype (Old_Formal); | |
4752 | New_Formal_Base := Etype (New_Formal); | |
4753 | ||
4754 | if Get_Inst then | |
4755 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
4756 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
4757 | end if; | |
4758 | ||
0791fbe9 | 4759 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa | 4760 | |
8fde064e AC |
4761 | -- Ensure that this rule is only applied when New_Id is a |
4762 | -- renaming of Old_Id. | |
ec4867fa | 4763 | |
5d37ba92 ES |
4764 | and then Nkind (Parent (Parent (New_Id))) = |
4765 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
4766 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
4767 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
4768 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
4769 | ||
8fde064e | 4770 | -- Now handle the allowed access-type case |
ec4867fa ES |
4771 | |
4772 | and then Is_Access_Type (Old_Formal_Base) | |
4773 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 | 4774 | |
8fde064e AC |
4775 | -- The type kinds must match. The only exception occurs with |
4776 | -- multiple generics of the form: | |
5d37ba92 | 4777 | |
8fde064e AC |
4778 | -- generic generic |
4779 | -- type F is private; type A is private; | |
4780 | -- type F_Ptr is access F; type A_Ptr is access A; | |
4781 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
4782 | -- package F_Pack is ... package A_Pack is | |
4783 | -- package F_Inst is | |
4784 | -- new F_Pack (A, A_Ptr, A_P); | |
5d37ba92 | 4785 | |
8fde064e AC |
4786 | -- When checking for conformance between the parameters of A_P |
4787 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
4788 | -- because the compiler has transformed A_Ptr into a subtype of | |
4789 | -- F_Ptr. We catch this case in the code below. | |
5d37ba92 ES |
4790 | |
4791 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4792 | or else | |
4793 | (Is_Generic_Type (Old_Formal_Base) | |
4794 | and then Is_Generic_Type (New_Formal_Base) | |
4795 | and then Is_Internal (New_Formal_Base) | |
4796 | and then Etype (Etype (New_Formal_Base)) = | |
4797 | Old_Formal_Base)) | |
ec4867fa | 4798 | and then Directly_Designated_Type (Old_Formal_Base) = |
8fde064e | 4799 | Directly_Designated_Type (New_Formal_Base) |
ec4867fa ES |
4800 | and then ((Is_Itype (Old_Formal_Base) |
4801 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
4802 | or else | |
4803 | (Is_Itype (New_Formal_Base) | |
4804 | and then Can_Never_Be_Null (New_Formal_Base))); | |
4805 | ||
996ae0b0 RK |
4806 | -- Types must always match. In the visible part of an instance, |
4807 | -- usual overloading rules for dispatching operations apply, and | |
4808 | -- we check base types (not the actual subtypes). | |
4809 | ||
4810 | if In_Instance_Visible_Part | |
4811 | and then Is_Dispatching_Operation (New_Id) | |
4812 | then | |
4813 | if not Conforming_Types | |
ec4867fa ES |
4814 | (T1 => Base_Type (Etype (Old_Formal)), |
4815 | T2 => Base_Type (Etype (New_Formal)), | |
4816 | Ctype => Ctype, | |
4817 | Get_Inst => Get_Inst) | |
4818 | and then not Access_Types_Match | |
996ae0b0 | 4819 | then |
5d37ba92 | 4820 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
4821 | return; |
4822 | end if; | |
4823 | ||
4824 | elsif not Conforming_Types | |
5d37ba92 ES |
4825 | (T1 => Old_Formal_Base, |
4826 | T2 => New_Formal_Base, | |
ec4867fa ES |
4827 | Ctype => Ctype, |
4828 | Get_Inst => Get_Inst) | |
4829 | and then not Access_Types_Match | |
996ae0b0 | 4830 | then |
c27f2f15 RD |
4831 | -- Don't give error message if old type is Any_Type. This test |
4832 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
4833 | ||
4834 | if Errmsg and then Old_Formal_Base = Any_Type then | |
4835 | Conforms := False; | |
4836 | else | |
7f568bfa AC |
4837 | if Ctype >= Subtype_Conformant |
4838 | and then | |
4839 | not Predicates_Match (Old_Formal_Base, New_Formal_Base) | |
4840 | then | |
4841 | Conformance_Error | |
4842 | ("\predicate of & does not match!", New_Formal); | |
4843 | else | |
4844 | Conformance_Error | |
4845 | ("\type of & does not match!", New_Formal); | |
4846 | end if; | |
c27f2f15 RD |
4847 | end if; |
4848 | ||
996ae0b0 RK |
4849 | return; |
4850 | end if; | |
4851 | ||
4852 | -- For mode conformance, mode must match | |
4853 | ||
5d37ba92 ES |
4854 | if Ctype >= Mode_Conformant then |
4855 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
4856 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
4857 | or else not Is_Primitive_Wrapper (New_Id) | |
4858 | then | |
4859 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 4860 | |
dd54644b JM |
4861 | else |
4862 | declare | |
c199ccf7 | 4863 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b JM |
4864 | begin |
4865 | if Is_Protected_Type | |
4866 | (Corresponding_Concurrent_Type (T)) | |
4867 | then | |
4868 | Error_Msg_PT (T, New_Id); | |
4869 | else | |
4870 | Conformance_Error | |
4871 | ("\mode of & does not match!", New_Formal); | |
4872 | end if; | |
4873 | end; | |
4874 | end if; | |
4875 | ||
5d37ba92 ES |
4876 | return; |
4877 | ||
4878 | -- Part of mode conformance for access types is having the same | |
4879 | -- constant modifier. | |
4880 | ||
4881 | elsif Access_Types_Match | |
4882 | and then Is_Access_Constant (Old_Formal_Base) /= | |
4883 | Is_Access_Constant (New_Formal_Base) | |
4884 | then | |
4885 | Conformance_Error | |
4886 | ("\constant modifier does not match!", New_Formal); | |
4887 | return; | |
4888 | end if; | |
996ae0b0 RK |
4889 | end if; |
4890 | ||
0a36105d | 4891 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 4892 | |
0a36105d JM |
4893 | -- Ada 2005 (AI-231): In case of anonymous access types check |
4894 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
4895 | -- match. For null exclusion, we test the types rather than the |
4896 | -- formals themselves, since the attribute is only set reliably | |
4897 | -- on the formals in the Ada 95 case, and we exclude the case | |
4898 | -- where Old_Formal is marked as controlling, to avoid errors | |
4899 | -- when matching completing bodies with dispatching declarations | |
4900 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 4901 | |
0791fbe9 | 4902 | if Ada_Version >= Ada_2005 |
0a36105d JM |
4903 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
4904 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
4905 | and then | |
c7b9d548 AC |
4906 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
4907 | Can_Never_Be_Null (Etype (New_Formal)) | |
4908 | and then | |
4909 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
4910 | or else |
4911 | Is_Access_Constant (Etype (Old_Formal)) /= | |
4912 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
4913 | |
4914 | -- Do not complain if error already posted on New_Formal. This | |
4915 | -- avoids some redundant error messages. | |
4916 | ||
4917 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
4918 | then |
4919 | -- It is allowed to omit the null-exclusion in case of stream | |
4920 | -- attribute subprograms. We recognize stream subprograms | |
4921 | -- through their TSS-generated suffix. | |
996ae0b0 | 4922 | |
0a36105d JM |
4923 | declare |
4924 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
3ada950b | 4925 | |
0a36105d JM |
4926 | begin |
4927 | if TSS_Name /= TSS_Stream_Read | |
4928 | and then TSS_Name /= TSS_Stream_Write | |
4929 | and then TSS_Name /= TSS_Stream_Input | |
4930 | and then TSS_Name /= TSS_Stream_Output | |
4931 | then | |
3ada950b | 4932 | -- Here we have a definite conformance error. It is worth |
71fb4dc8 | 4933 | -- special casing the error message for the case of a |
3ada950b AC |
4934 | -- controlling formal (which excludes null). |
4935 | ||
4936 | if Is_Controlling_Formal (New_Formal) then | |
4937 | Error_Msg_Node_2 := Scope (New_Formal); | |
4938 | Conformance_Error | |
4939 | ("\controlling formal& of& excludes null, " | |
4940 | & "declaration must exclude null as well", | |
4941 | New_Formal); | |
4942 | ||
4943 | -- Normal case (couldn't we give more detail here???) | |
4944 | ||
4945 | else | |
4946 | Conformance_Error | |
4947 | ("\type of & does not match!", New_Formal); | |
4948 | end if; | |
4949 | ||
0a36105d JM |
4950 | return; |
4951 | end if; | |
4952 | end; | |
4953 | end if; | |
4954 | end if; | |
41251c60 | 4955 | |
0a36105d | 4956 | -- Full conformance checks |
41251c60 | 4957 | |
0a36105d | 4958 | if Ctype = Fully_Conformant then |
e660dbf7 | 4959 | |
0a36105d | 4960 | -- We have checked already that names match |
e660dbf7 | 4961 | |
0a36105d | 4962 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
4963 | |
4964 | -- Check default expressions for in parameters | |
4965 | ||
996ae0b0 RK |
4966 | declare |
4967 | NewD : constant Boolean := | |
4968 | Present (Default_Value (New_Formal)); | |
4969 | OldD : constant Boolean := | |
4970 | Present (Default_Value (Old_Formal)); | |
4971 | begin | |
4972 | if NewD or OldD then | |
4973 | ||
82c80734 RD |
4974 | -- The old default value has been analyzed because the |
4975 | -- current full declaration will have frozen everything | |
0a36105d JM |
4976 | -- before. The new default value has not been analyzed, |
4977 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
4978 | |
4979 | if NewD then | |
0a36105d | 4980 | Push_Scope (New_Id); |
21d27997 | 4981 | Preanalyze_Spec_Expression |
fbf5a39b | 4982 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
4983 | End_Scope; |
4984 | end if; | |
4985 | ||
4986 | if not (NewD and OldD) | |
4987 | or else not Fully_Conformant_Expressions | |
4988 | (Default_Value (Old_Formal), | |
4989 | Default_Value (New_Formal)) | |
4990 | then | |
4991 | Conformance_Error | |
5d37ba92 | 4992 | ("\default expression for & does not match!", |
996ae0b0 RK |
4993 | New_Formal); |
4994 | return; | |
4995 | end if; | |
4996 | end if; | |
4997 | end; | |
4998 | end if; | |
4999 | end if; | |
5000 | ||
5001 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 5002 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
5003 | -- or if either old or new instance is not from the source program. |
5004 | ||
0ab80019 | 5005 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5006 | and then Sloc (Old_Id) > Standard_Location |
5007 | and then Sloc (New_Id) > Standard_Location | |
5008 | and then Comes_From_Source (Old_Id) | |
5009 | and then Comes_From_Source (New_Id) | |
5010 | then | |
5011 | declare | |
5012 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
5013 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
5014 | ||
5015 | begin | |
5016 | -- Explicit IN must be present or absent in both cases. This | |
5017 | -- test is required only in the full conformance case. | |
5018 | ||
5019 | if In_Present (Old_Param) /= In_Present (New_Param) | |
5020 | and then Ctype = Fully_Conformant | |
5021 | then | |
5022 | Conformance_Error | |
5d37ba92 | 5023 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
5024 | New_Formal); |
5025 | return; | |
5026 | end if; | |
5027 | ||
5028 | -- Grouping (use of comma in param lists) must be the same | |
5029 | -- This is where we catch a misconformance like: | |
5030 | ||
0a36105d | 5031 | -- A, B : Integer |
996ae0b0 RK |
5032 | -- A : Integer; B : Integer |
5033 | ||
5034 | -- which are represented identically in the tree except | |
5035 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5036 | ||
5037 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
5038 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
5039 | then | |
5040 | Conformance_Error | |
5d37ba92 | 5041 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
5042 | return; |
5043 | end if; | |
5044 | end; | |
5045 | end if; | |
5046 | ||
41251c60 JM |
5047 | -- This label is required when skipping controlling formals |
5048 | ||
5049 | <<Skip_Controlling_Formal>> | |
5050 | ||
996ae0b0 RK |
5051 | Next_Formal (Old_Formal); |
5052 | Next_Formal (New_Formal); | |
5053 | end loop; | |
5054 | ||
5055 | if Present (Old_Formal) then | |
5d37ba92 | 5056 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
5057 | return; |
5058 | ||
5059 | elsif Present (New_Formal) then | |
5d37ba92 | 5060 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
5061 | return; |
5062 | end if; | |
996ae0b0 RK |
5063 | end Check_Conformance; |
5064 | ||
ec4867fa ES |
5065 | ----------------------- |
5066 | -- Check_Conventions -- | |
5067 | ----------------------- | |
5068 | ||
5069 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 5070 | Ifaces_List : Elist_Id; |
0a36105d | 5071 | |
ce2b6ba5 | 5072 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
5073 | -- Verify that the convention of inherited dispatching operation Op is |
5074 | -- consistent among all subprograms it overrides. In order to minimize | |
5075 | -- the search, Search_From is utilized to designate a specific point in | |
5076 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
5077 | |
5078 | ---------------------- | |
5079 | -- Check_Convention -- | |
5080 | ---------------------- | |
5081 | ||
ce2b6ba5 | 5082 | procedure Check_Convention (Op : Entity_Id) is |
9f6aaa5c AC |
5083 | function Convention_Of (Id : Entity_Id) return Convention_Id; |
5084 | -- Given an entity, return its convention. The function treats Ghost | |
5085 | -- as convention Ada because the two have the same dynamic semantics. | |
5086 | ||
5087 | ------------------- | |
5088 | -- Convention_Of -- | |
5089 | ------------------- | |
5090 | ||
5091 | function Convention_Of (Id : Entity_Id) return Convention_Id is | |
5092 | Conv : constant Convention_Id := Convention (Id); | |
5093 | begin | |
5094 | if Conv = Convention_Ghost then | |
5095 | return Convention_Ada; | |
5096 | else | |
5097 | return Conv; | |
5098 | end if; | |
5099 | end Convention_Of; | |
5100 | ||
5101 | -- Local variables | |
5102 | ||
5103 | Op_Conv : constant Convention_Id := Convention_Of (Op); | |
5104 | Iface_Conv : Convention_Id; | |
ce2b6ba5 JM |
5105 | Iface_Elmt : Elmt_Id; |
5106 | Iface_Prim_Elmt : Elmt_Id; | |
5107 | Iface_Prim : Entity_Id; | |
ec4867fa | 5108 | |
9f6aaa5c AC |
5109 | -- Start of processing for Check_Convention |
5110 | ||
ce2b6ba5 JM |
5111 | begin |
5112 | Iface_Elmt := First_Elmt (Ifaces_List); | |
5113 | while Present (Iface_Elmt) loop | |
5114 | Iface_Prim_Elmt := | |
9f6aaa5c | 5115 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
ce2b6ba5 JM |
5116 | while Present (Iface_Prim_Elmt) loop |
5117 | Iface_Prim := Node (Iface_Prim_Elmt); | |
9f6aaa5c | 5118 | Iface_Conv := Convention_Of (Iface_Prim); |
ce2b6ba5 JM |
5119 | |
5120 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
9f6aaa5c | 5121 | and then Iface_Conv /= Op_Conv |
ce2b6ba5 | 5122 | then |
ed2233dc | 5123 | Error_Msg_N |
ce2b6ba5 | 5124 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 5125 | |
ce2b6ba5 | 5126 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c | 5127 | Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
ce2b6ba5 | 5128 | Error_Msg_Sloc := Sloc (Op); |
ec4867fa | 5129 | |
7a963087 | 5130 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 5131 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 5132 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 5133 | else |
ed2233dc | 5134 | Error_Msg_N |
19d846a0 RD |
5135 | ("\\overriding operation % with " & |
5136 | "convention % defined #", Typ); | |
ce2b6ba5 | 5137 | end if; |
ec4867fa | 5138 | |
ce2b6ba5 JM |
5139 | else pragma Assert (Present (Alias (Op))); |
5140 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
ed2233dc | 5141 | Error_Msg_N |
19d846a0 RD |
5142 | ("\\inherited operation % with " & |
5143 | "convention % defined #", Typ); | |
ce2b6ba5 | 5144 | end if; |
ec4867fa | 5145 | |
ce2b6ba5 | 5146 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c AC |
5147 | Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
5148 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
ed2233dc | 5149 | Error_Msg_N |
19d846a0 RD |
5150 | ("\\overridden operation % with " & |
5151 | "convention % defined #", Typ); | |
ec4867fa | 5152 | |
ce2b6ba5 | 5153 | -- Avoid cascading errors |
ec4867fa | 5154 | |
ce2b6ba5 JM |
5155 | return; |
5156 | end if; | |
ec4867fa | 5157 | |
ce2b6ba5 JM |
5158 | Next_Elmt (Iface_Prim_Elmt); |
5159 | end loop; | |
ec4867fa | 5160 | |
ce2b6ba5 | 5161 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
5162 | end loop; |
5163 | end Check_Convention; | |
5164 | ||
5165 | -- Local variables | |
5166 | ||
5167 | Prim_Op : Entity_Id; | |
5168 | Prim_Op_Elmt : Elmt_Id; | |
5169 | ||
5170 | -- Start of processing for Check_Conventions | |
5171 | ||
5172 | begin | |
ce2b6ba5 JM |
5173 | if not Has_Interfaces (Typ) then |
5174 | return; | |
5175 | end if; | |
5176 | ||
5177 | Collect_Interfaces (Typ, Ifaces_List); | |
5178 | ||
0a36105d JM |
5179 | -- The algorithm checks every overriding dispatching operation against |
5180 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 5181 | -- differences in conventions. |
ec4867fa ES |
5182 | |
5183 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
5184 | while Present (Prim_Op_Elmt) loop | |
5185 | Prim_Op := Node (Prim_Op_Elmt); | |
5186 | ||
0a36105d | 5187 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 5188 | -- since they always have the same convention. |
ec4867fa | 5189 | |
ce2b6ba5 JM |
5190 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
5191 | Check_Convention (Prim_Op); | |
ec4867fa ES |
5192 | end if; |
5193 | ||
5194 | Next_Elmt (Prim_Op_Elmt); | |
5195 | end loop; | |
5196 | end Check_Conventions; | |
5197 | ||
996ae0b0 RK |
5198 | ------------------------------ |
5199 | -- Check_Delayed_Subprogram -- | |
5200 | ------------------------------ | |
5201 | ||
5202 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
5203 | F : Entity_Id; | |
5204 | ||
5205 | procedure Possible_Freeze (T : Entity_Id); | |
5206 | -- T is the type of either a formal parameter or of the return type. | |
5207 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
5208 | -- subprogram itself must be delayed. If T is the limited view of an |
5209 | -- incomplete type the subprogram must be frozen as well, because | |
5210 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 5211 | |
82c80734 RD |
5212 | --------------------- |
5213 | -- Possible_Freeze -- | |
5214 | --------------------- | |
5215 | ||
996ae0b0 RK |
5216 | procedure Possible_Freeze (T : Entity_Id) is |
5217 | begin | |
4a13695c | 5218 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
5219 | Set_Has_Delayed_Freeze (Designator); |
5220 | ||
5221 | elsif Is_Access_Type (T) | |
5222 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
5223 | and then not Is_Frozen (Designated_Type (T)) | |
5224 | then | |
5225 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 5226 | |
7b56a91b AC |
5227 | elsif Ekind (T) = E_Incomplete_Type |
5228 | and then From_Limited_With (T) | |
5229 | then | |
e358346d | 5230 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 5231 | |
9aff36e9 RD |
5232 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
5233 | -- of a subprogram or entry declaration. | |
406935b6 AC |
5234 | |
5235 | elsif Ekind (T) = E_Incomplete_Type | |
5236 | and then Ada_Version >= Ada_2012 | |
5237 | then | |
5238 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 5239 | end if; |
4a13695c | 5240 | |
996ae0b0 RK |
5241 | end Possible_Freeze; |
5242 | ||
5243 | -- Start of processing for Check_Delayed_Subprogram | |
5244 | ||
5245 | begin | |
76e3504f AC |
5246 | -- All subprograms, including abstract subprograms, may need a freeze |
5247 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 5248 | |
76e3504f AC |
5249 | Possible_Freeze (Etype (Designator)); |
5250 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 5251 | |
76e3504f AC |
5252 | -- Need delayed freeze if any of the formal types themselves need |
5253 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 5254 | |
76e3504f AC |
5255 | F := First_Formal (Designator); |
5256 | while Present (F) loop | |
5257 | Possible_Freeze (Etype (F)); | |
5258 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
5259 | Next_Formal (F); | |
5260 | end loop; | |
996ae0b0 RK |
5261 | |
5262 | -- Mark functions that return by reference. Note that it cannot be | |
5263 | -- done for delayed_freeze subprograms because the underlying | |
5264 | -- returned type may not be known yet (for private types) | |
5265 | ||
8fde064e | 5266 | if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
996ae0b0 RK |
5267 | declare |
5268 | Typ : constant Entity_Id := Etype (Designator); | |
5269 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
996ae0b0 | 5270 | begin |
51245e2d | 5271 | if Is_Limited_View (Typ) then |
996ae0b0 | 5272 | Set_Returns_By_Ref (Designator); |
048e5cef | 5273 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
5274 | Set_Returns_By_Ref (Designator); |
5275 | end if; | |
5276 | end; | |
5277 | end if; | |
5278 | end Check_Delayed_Subprogram; | |
5279 | ||
5280 | ------------------------------------ | |
5281 | -- Check_Discriminant_Conformance -- | |
5282 | ------------------------------------ | |
5283 | ||
5284 | procedure Check_Discriminant_Conformance | |
5285 | (N : Node_Id; | |
5286 | Prev : Entity_Id; | |
5287 | Prev_Loc : Node_Id) | |
5288 | is | |
5289 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
5290 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
5291 | New_Discr_Id : Entity_Id; | |
5292 | New_Discr_Type : Entity_Id; | |
5293 | ||
5294 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
5295 | -- Post error message for conformance error on given node. Two messages |
5296 | -- are output. The first points to the previous declaration with a | |
5297 | -- general "no conformance" message. The second is the detailed reason, | |
5298 | -- supplied as Msg. The parameter N provide information for a possible | |
5299 | -- & insertion in the message. | |
996ae0b0 RK |
5300 | |
5301 | ----------------------- | |
5302 | -- Conformance_Error -- | |
5303 | ----------------------- | |
5304 | ||
5305 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
5306 | begin | |
5307 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
5308 | Error_Msg_N -- CODEFIX |
5309 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
5310 | Error_Msg_NE (Msg, N, N); |
5311 | end Conformance_Error; | |
5312 | ||
5313 | -- Start of processing for Check_Discriminant_Conformance | |
5314 | ||
5315 | begin | |
5316 | while Present (Old_Discr) and then Present (New_Discr) loop | |
996ae0b0 RK |
5317 | New_Discr_Id := Defining_Identifier (New_Discr); |
5318 | ||
82c80734 RD |
5319 | -- The subtype mark of the discriminant on the full type has not |
5320 | -- been analyzed so we do it here. For an access discriminant a new | |
5321 | -- type is created. | |
996ae0b0 RK |
5322 | |
5323 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
5324 | New_Discr_Type := | |
5325 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
5326 | ||
5327 | else | |
5328 | Analyze (Discriminant_Type (New_Discr)); | |
5329 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
5330 | |
5331 | -- Ada 2005: if the discriminant definition carries a null | |
5332 | -- exclusion, create an itype to check properly for consistency | |
5333 | -- with partial declaration. | |
5334 | ||
5335 | if Is_Access_Type (New_Discr_Type) | |
8fde064e | 5336 | and then Null_Exclusion_Present (New_Discr) |
e50e1c5e AC |
5337 | then |
5338 | New_Discr_Type := | |
5339 | Create_Null_Excluding_Itype | |
5340 | (T => New_Discr_Type, | |
5341 | Related_Nod => New_Discr, | |
5342 | Scope_Id => Current_Scope); | |
5343 | end if; | |
996ae0b0 RK |
5344 | end if; |
5345 | ||
5346 | if not Conforming_Types | |
5347 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
5348 | then | |
5349 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
5350 | return; | |
fbf5a39b | 5351 | else |
82c80734 RD |
5352 | -- Treat the new discriminant as an occurrence of the old one, |
5353 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
5354 | -- information, for completeness. |
5355 | ||
5356 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
5357 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
5358 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
5359 | end if; |
5360 | ||
5361 | -- Names must match | |
5362 | ||
5363 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
5364 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
5365 | return; | |
5366 | end if; | |
5367 | ||
5368 | -- Default expressions must match | |
5369 | ||
5370 | declare | |
5371 | NewD : constant Boolean := | |
5372 | Present (Expression (New_Discr)); | |
5373 | OldD : constant Boolean := | |
5374 | Present (Expression (Parent (Old_Discr))); | |
5375 | ||
5376 | begin | |
5377 | if NewD or OldD then | |
5378 | ||
5379 | -- The old default value has been analyzed and expanded, | |
5380 | -- because the current full declaration will have frozen | |
82c80734 RD |
5381 | -- everything before. The new default values have not been |
5382 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
5383 | |
5384 | if NewD then | |
21d27997 | 5385 | Preanalyze_Spec_Expression |
996ae0b0 RK |
5386 | (Expression (New_Discr), New_Discr_Type); |
5387 | end if; | |
5388 | ||
5389 | if not (NewD and OldD) | |
5390 | or else not Fully_Conformant_Expressions | |
5391 | (Expression (Parent (Old_Discr)), | |
5392 | Expression (New_Discr)) | |
5393 | ||
5394 | then | |
5395 | Conformance_Error | |
5396 | ("default expression for & does not match!", | |
5397 | New_Discr_Id); | |
5398 | return; | |
5399 | end if; | |
5400 | end if; | |
5401 | end; | |
5402 | ||
5403 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
5404 | ||
0ab80019 | 5405 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
5406 | declare |
5407 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
5408 | ||
5409 | begin | |
5410 | -- Grouping (use of comma in param lists) must be the same | |
5411 | -- This is where we catch a misconformance like: | |
5412 | ||
60370fb1 | 5413 | -- A, B : Integer |
996ae0b0 RK |
5414 | -- A : Integer; B : Integer |
5415 | ||
5416 | -- which are represented identically in the tree except | |
5417 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5418 | ||
5419 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
5420 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
5421 | then | |
5422 | Conformance_Error | |
5423 | ("grouping of & does not match!", New_Discr_Id); | |
5424 | return; | |
5425 | end if; | |
5426 | end; | |
5427 | end if; | |
5428 | ||
5429 | Next_Discriminant (Old_Discr); | |
5430 | Next (New_Discr); | |
5431 | end loop; | |
5432 | ||
5433 | if Present (Old_Discr) then | |
5434 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
5435 | return; | |
5436 | ||
5437 | elsif Present (New_Discr) then | |
5438 | Conformance_Error | |
5439 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
5440 | return; | |
5441 | end if; | |
5442 | end Check_Discriminant_Conformance; | |
5443 | ||
5444 | ---------------------------- | |
5445 | -- Check_Fully_Conformant -- | |
5446 | ---------------------------- | |
5447 | ||
5448 | procedure Check_Fully_Conformant | |
5449 | (New_Id : Entity_Id; | |
5450 | Old_Id : Entity_Id; | |
5451 | Err_Loc : Node_Id := Empty) | |
5452 | is | |
5453 | Result : Boolean; | |
81db9d77 | 5454 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5455 | begin |
5456 | Check_Conformance | |
5457 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
5458 | end Check_Fully_Conformant; | |
5459 | ||
5460 | --------------------------- | |
5461 | -- Check_Mode_Conformant -- | |
5462 | --------------------------- | |
5463 | ||
5464 | procedure Check_Mode_Conformant | |
5465 | (New_Id : Entity_Id; | |
5466 | Old_Id : Entity_Id; | |
5467 | Err_Loc : Node_Id := Empty; | |
5468 | Get_Inst : Boolean := False) | |
5469 | is | |
5470 | Result : Boolean; | |
81db9d77 | 5471 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5472 | begin |
5473 | Check_Conformance | |
5474 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
5475 | end Check_Mode_Conformant; | |
5476 | ||
fbf5a39b | 5477 | -------------------------------- |
758c442c | 5478 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
5479 | -------------------------------- |
5480 | ||
758c442c | 5481 | procedure Check_Overriding_Indicator |
ec4867fa | 5482 | (Subp : Entity_Id; |
5d37ba92 ES |
5483 | Overridden_Subp : Entity_Id; |
5484 | Is_Primitive : Boolean) | |
fbf5a39b | 5485 | is |
758c442c GD |
5486 | Decl : Node_Id; |
5487 | Spec : Node_Id; | |
fbf5a39b AC |
5488 | |
5489 | begin | |
ec4867fa | 5490 | -- No overriding indicator for literals |
fbf5a39b | 5491 | |
ec4867fa | 5492 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 5493 | return; |
fbf5a39b | 5494 | |
ec4867fa ES |
5495 | elsif Ekind (Subp) = E_Entry then |
5496 | Decl := Parent (Subp); | |
5497 | ||
53b10ce9 AC |
5498 | -- No point in analyzing a malformed operator |
5499 | ||
5500 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
5501 | and then Error_Posted (Subp) | |
5502 | then | |
5503 | return; | |
5504 | ||
758c442c GD |
5505 | else |
5506 | Decl := Unit_Declaration_Node (Subp); | |
5507 | end if; | |
fbf5a39b | 5508 | |
800621e0 RD |
5509 | if Nkind_In (Decl, N_Subprogram_Body, |
5510 | N_Subprogram_Body_Stub, | |
5511 | N_Subprogram_Declaration, | |
5512 | N_Abstract_Subprogram_Declaration, | |
5513 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
5514 | then |
5515 | Spec := Specification (Decl); | |
ec4867fa ES |
5516 | |
5517 | elsif Nkind (Decl) = N_Entry_Declaration then | |
5518 | Spec := Decl; | |
5519 | ||
758c442c GD |
5520 | else |
5521 | return; | |
5522 | end if; | |
fbf5a39b | 5523 | |
e7d72fb9 AC |
5524 | -- The overriding operation is type conformant with the overridden one, |
5525 | -- but the names of the formals are not required to match. If the names | |
6823270c | 5526 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
5527 | -- source of confusion that is worth diagnosing. Controlling formals |
5528 | -- often carry names that reflect the type, and it is not worthwhile | |
5529 | -- requiring that their names match. | |
5530 | ||
c9e7bd8e | 5531 | if Present (Overridden_Subp) |
e7d72fb9 AC |
5532 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
5533 | then | |
5534 | declare | |
5535 | Form1 : Entity_Id; | |
5536 | Form2 : Entity_Id; | |
5537 | ||
5538 | begin | |
5539 | Form1 := First_Formal (Subp); | |
5540 | Form2 := First_Formal (Overridden_Subp); | |
5541 | ||
c9e7bd8e AC |
5542 | -- If the overriding operation is a synchronized operation, skip |
5543 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
5544 | -- implicit in the new one. If the operation is declared in the |
5545 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 5546 | |
6823270c AC |
5547 | if Is_Concurrent_Type (Scope (Subp)) |
5548 | and then Is_Tagged_Type (Scope (Subp)) | |
5549 | and then not Has_Completion (Scope (Subp)) | |
5550 | then | |
c9e7bd8e AC |
5551 | Form2 := Next_Formal (Form2); |
5552 | end if; | |
5553 | ||
e7d72fb9 AC |
5554 | if Present (Form1) then |
5555 | Form1 := Next_Formal (Form1); | |
5556 | Form2 := Next_Formal (Form2); | |
5557 | end if; | |
5558 | ||
5559 | while Present (Form1) loop | |
5560 | if not Is_Controlling_Formal (Form1) | |
5561 | and then Present (Next_Formal (Form2)) | |
5562 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
5563 | then | |
5564 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
5565 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 5566 | Error_Msg_NE |
19d846a0 | 5567 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
5568 | Form1, Form1); |
5569 | exit; | |
5570 | end if; | |
5571 | ||
5572 | Next_Formal (Form1); | |
5573 | Next_Formal (Form2); | |
5574 | end loop; | |
5575 | end; | |
5576 | end if; | |
5577 | ||
676e8420 AC |
5578 | -- If there is an overridden subprogram, then check that there is no |
5579 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
5580 | -- This is not done if the overridden subprogram is marked as hidden, |
5581 | -- which can occur for the case of inherited controlled operations | |
5582 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
5583 | -- subprogram is not itself hidden. (Note: This condition could probably | |
5584 | -- be simplified, leaving out the testing for the specific controlled | |
5585 | -- cases, but it seems safer and clearer this way, and echoes similar | |
5586 | -- special-case tests of this kind in other places.) | |
5587 | ||
fd0d899b | 5588 | if Present (Overridden_Subp) |
51bf9bdf AC |
5589 | and then (not Is_Hidden (Overridden_Subp) |
5590 | or else | |
b69cd36a AC |
5591 | (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
5592 | Name_Adjust, | |
5593 | Name_Finalize) | |
f0709ca6 AC |
5594 | and then Present (Alias (Overridden_Subp)) |
5595 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 5596 | then |
ec4867fa ES |
5597 | if Must_Not_Override (Spec) then |
5598 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 5599 | |
ec4867fa | 5600 | if Ekind (Subp) = E_Entry then |
ed2233dc | 5601 | Error_Msg_NE |
5d37ba92 | 5602 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5603 | else |
ed2233dc | 5604 | Error_Msg_NE |
5d37ba92 | 5605 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5606 | end if; |
21d27997 | 5607 | |
bd603506 | 5608 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
5609 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
5610 | -- operation. This operation should not be inherited by other limited | |
5611 | -- controlled types. An explicit Adjust for them is not overriding. | |
5612 | ||
5613 | elsif Must_Override (Spec) | |
5614 | and then Chars (Overridden_Subp) = Name_Adjust | |
5615 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
5616 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
5617 | and then |
5618 | Is_Predefined_File_Name | |
5619 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
5620 | then |
5621 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5622 | ||
21d27997 | 5623 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
5624 | if Is_Init_Proc (Subp) then |
5625 | null; | |
5626 | ||
5627 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
5628 | |
5629 | -- For entities generated by Derive_Subprograms the overridden | |
5630 | -- operation is the inherited primitive (which is available | |
5631 | -- through the attribute alias) | |
5632 | ||
5633 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 5634 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 5635 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
5636 | and then Find_Dispatching_Type (Overridden_Subp) = |
5637 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
5638 | and then Present (Alias (Overridden_Subp)) |
5639 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
5640 | then | |
5641 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 5642 | |
1c1289e7 AC |
5643 | else |
5644 | Set_Overridden_Operation (Subp, Overridden_Subp); | |
5645 | end if; | |
5646 | end if; | |
ec4867fa | 5647 | end if; |
f937473f | 5648 | |
618fb570 AC |
5649 | -- If primitive flag is set or this is a protected operation, then |
5650 | -- the operation is overriding at the point of its declaration, so | |
5651 | -- warn if necessary. Otherwise it may have been declared before the | |
5652 | -- operation it overrides and no check is required. | |
3c25856a AC |
5653 | |
5654 | if Style_Check | |
618fb570 AC |
5655 | and then not Must_Override (Spec) |
5656 | and then (Is_Primitive | |
5657 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 5658 | then |
235f4375 AC |
5659 | Style.Missing_Overriding (Decl, Subp); |
5660 | end if; | |
5661 | ||
53b10ce9 AC |
5662 | -- If Subp is an operator, it may override a predefined operation, if |
5663 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 5664 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
5665 | -- representation for predefined operators. We have to check whether the |
5666 | -- signature of Subp matches that of a predefined operator. Note that | |
5667 | -- first argument provides the name of the operator, and the second | |
5668 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
5669 | -- If the indicator is overriding, then the operator must match a |
5670 | -- predefined signature, because we know already that there is no | |
5671 | -- explicit overridden operation. | |
f937473f | 5672 | |
21d27997 | 5673 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 5674 | if Must_Not_Override (Spec) then |
f937473f | 5675 | |
806f6d37 AC |
5676 | -- If this is not a primitive or a protected subprogram, then |
5677 | -- "not overriding" is illegal. | |
618fb570 | 5678 | |
806f6d37 AC |
5679 | if not Is_Primitive |
5680 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5681 | then | |
5682 | Error_Msg_N | |
5683 | ("overriding indicator only allowed " | |
5684 | & "if subprogram is primitive", Subp); | |
618fb570 | 5685 | |
806f6d37 AC |
5686 | elsif Can_Override_Operator (Subp) then |
5687 | Error_Msg_NE | |
5688 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
5689 | end if; | |
f937473f | 5690 | |
806f6d37 AC |
5691 | elsif Must_Override (Spec) then |
5692 | if No (Overridden_Operation (Subp)) | |
5693 | and then not Can_Override_Operator (Subp) | |
5694 | then | |
5695 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5696 | end if; | |
5d37ba92 | 5697 | |
806f6d37 AC |
5698 | elsif not Error_Posted (Subp) |
5699 | and then Style_Check | |
5700 | and then Can_Override_Operator (Subp) | |
5701 | and then | |
5702 | not Is_Predefined_File_Name | |
5703 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
5704 | then | |
5705 | -- If style checks are enabled, indicate that the indicator is | |
5706 | -- missing. However, at the point of declaration, the type of | |
5707 | -- which this is a primitive operation may be private, in which | |
5708 | -- case the indicator would be premature. | |
235f4375 | 5709 | |
806f6d37 AC |
5710 | if Has_Private_Declaration (Etype (Subp)) |
5711 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 5712 | then |
806f6d37 AC |
5713 | null; |
5714 | else | |
5715 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 5716 | end if; |
806f6d37 | 5717 | end if; |
21d27997 RD |
5718 | |
5719 | elsif Must_Override (Spec) then | |
5720 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 5721 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 5722 | else |
ed2233dc | 5723 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 5724 | end if; |
5d37ba92 ES |
5725 | |
5726 | -- If the operation is marked "not overriding" and it's not primitive | |
5727 | -- then an error is issued, unless this is an operation of a task or | |
5728 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
5729 | -- has been specified have already been checked above. | |
5730 | ||
5731 | elsif Must_Not_Override (Spec) | |
5732 | and then not Is_Primitive | |
5733 | and then Ekind (Subp) /= E_Entry | |
5734 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5735 | then | |
ed2233dc | 5736 | Error_Msg_N |
5d37ba92 ES |
5737 | ("overriding indicator only allowed if subprogram is primitive", |
5738 | Subp); | |
5d37ba92 | 5739 | return; |
fbf5a39b | 5740 | end if; |
758c442c | 5741 | end Check_Overriding_Indicator; |
fbf5a39b | 5742 | |
996ae0b0 RK |
5743 | ------------------- |
5744 | -- Check_Returns -- | |
5745 | ------------------- | |
5746 | ||
0a36105d JM |
5747 | -- Note: this procedure needs to know far too much about how the expander |
5748 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
5749 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
5750 | -- works, but is not very clean. It would be better if the expansion | |
5751 | -- routines would leave Original_Node working nicely, and we could use | |
5752 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
5753 | ||
996ae0b0 RK |
5754 | procedure Check_Returns |
5755 | (HSS : Node_Id; | |
5756 | Mode : Character; | |
c8ef728f ES |
5757 | Err : out Boolean; |
5758 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
5759 | is |
5760 | Handler : Node_Id; | |
5761 | ||
5762 | procedure Check_Statement_Sequence (L : List_Id); | |
5763 | -- Internal recursive procedure to check a list of statements for proper | |
5764 | -- termination by a return statement (or a transfer of control or a | |
5765 | -- compound statement that is itself internally properly terminated). | |
5766 | ||
5767 | ------------------------------ | |
5768 | -- Check_Statement_Sequence -- | |
5769 | ------------------------------ | |
5770 | ||
5771 | procedure Check_Statement_Sequence (L : List_Id) is | |
5772 | Last_Stm : Node_Id; | |
0a36105d | 5773 | Stm : Node_Id; |
996ae0b0 RK |
5774 | Kind : Node_Kind; |
5775 | ||
7b27e183 AC |
5776 | function Assert_False return Boolean; |
5777 | -- Returns True if Last_Stm is a pragma Assert (False) that has been | |
5778 | -- rewritten as a null statement when assertions are off. The assert | |
5779 | -- is not active, but it is still enough to kill the warning. | |
5780 | ||
5781 | ------------------ | |
5782 | -- Assert_False -- | |
5783 | ------------------ | |
5784 | ||
5785 | function Assert_False return Boolean is | |
5786 | Orig : constant Node_Id := Original_Node (Last_Stm); | |
5787 | ||
5788 | begin | |
5789 | if Nkind (Orig) = N_Pragma | |
5790 | and then Pragma_Name (Orig) = Name_Assert | |
5791 | and then not Error_Posted (Orig) | |
5792 | then | |
5793 | declare | |
5794 | Arg : constant Node_Id := | |
5795 | First (Pragma_Argument_Associations (Orig)); | |
5796 | Exp : constant Node_Id := Expression (Arg); | |
5797 | begin | |
5798 | return Nkind (Exp) = N_Identifier | |
5799 | and then Chars (Exp) = Name_False; | |
5800 | end; | |
5801 | ||
5802 | else | |
5803 | return False; | |
5804 | end if; | |
5805 | end Assert_False; | |
5806 | ||
5807 | -- Local variables | |
5808 | ||
996ae0b0 RK |
5809 | Raise_Exception_Call : Boolean; |
5810 | -- Set True if statement sequence terminated by Raise_Exception call | |
5811 | -- or a Reraise_Occurrence call. | |
5812 | ||
7b27e183 AC |
5813 | -- Start of processing for Check_Statement_Sequence |
5814 | ||
996ae0b0 RK |
5815 | begin |
5816 | Raise_Exception_Call := False; | |
5817 | ||
5818 | -- Get last real statement | |
5819 | ||
5820 | Last_Stm := Last (L); | |
5821 | ||
0a36105d JM |
5822 | -- Deal with digging out exception handler statement sequences that |
5823 | -- have been transformed by the local raise to goto optimization. | |
5824 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
5825 | -- optimization has occurred, we are looking at something like: | |
5826 | ||
5827 | -- begin | |
5828 | -- original stmts in block | |
5829 | ||
5830 | -- exception \ | |
5831 | -- when excep1 => | | |
5832 | -- goto L1; | omitted if No_Exception_Propagation | |
5833 | -- when excep2 => | | |
5834 | -- goto L2; / | |
5835 | -- end; | |
5836 | ||
5837 | -- goto L3; -- skip handler when exception not raised | |
5838 | ||
5839 | -- <<L1>> -- target label for local exception | |
5840 | -- begin | |
5841 | -- estmts1 | |
5842 | -- end; | |
5843 | ||
5844 | -- goto L3; | |
5845 | ||
5846 | -- <<L2>> | |
5847 | -- begin | |
5848 | -- estmts2 | |
5849 | -- end; | |
5850 | ||
5851 | -- <<L3>> | |
5852 | ||
5853 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
5854 | -- sequences (which were the original sequences of statements in | |
5855 | -- the exception handlers) and check them. | |
5856 | ||
8fde064e | 5857 | if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
0a36105d JM |
5858 | Stm := Last_Stm; |
5859 | loop | |
5860 | Prev (Stm); | |
5861 | exit when No (Stm); | |
5862 | exit when Nkind (Stm) /= N_Block_Statement; | |
5863 | exit when not Exception_Junk (Stm); | |
5864 | Prev (Stm); | |
5865 | exit when No (Stm); | |
5866 | exit when Nkind (Stm) /= N_Label; | |
5867 | exit when not Exception_Junk (Stm); | |
5868 | Check_Statement_Sequence | |
5869 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
5870 | ||
5871 | Prev (Stm); | |
5872 | Last_Stm := Stm; | |
5873 | exit when No (Stm); | |
5874 | exit when Nkind (Stm) /= N_Goto_Statement; | |
5875 | exit when not Exception_Junk (Stm); | |
5876 | end loop; | |
5877 | end if; | |
5878 | ||
996ae0b0 RK |
5879 | -- Don't count pragmas |
5880 | ||
5881 | while Nkind (Last_Stm) = N_Pragma | |
5882 | ||
5883 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
5884 | ||
5885 | or else | |
5886 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
5887 | and then | |
5888 | Nkind (Name (Last_Stm)) = N_Identifier | |
5889 | and then | |
5890 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
5891 | ||
5892 | -- Don't count exception junk | |
5893 | ||
5894 | or else | |
800621e0 RD |
5895 | (Nkind_In (Last_Stm, N_Goto_Statement, |
5896 | N_Label, | |
5897 | N_Object_Declaration) | |
8fde064e | 5898 | and then Exception_Junk (Last_Stm)) |
0a36105d JM |
5899 | or else Nkind (Last_Stm) in N_Push_xxx_Label |
5900 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
e3b3266c AC |
5901 | |
5902 | -- Inserted code, such as finalization calls, is irrelevant: we only | |
5903 | -- need to check original source. | |
5904 | ||
5905 | or else Is_Rewrite_Insertion (Last_Stm) | |
996ae0b0 RK |
5906 | loop |
5907 | Prev (Last_Stm); | |
5908 | end loop; | |
5909 | ||
5910 | -- Here we have the "real" last statement | |
5911 | ||
5912 | Kind := Nkind (Last_Stm); | |
5913 | ||
5914 | -- Transfer of control, OK. Note that in the No_Return procedure | |
5915 | -- case, we already diagnosed any explicit return statements, so | |
5916 | -- we can treat them as OK in this context. | |
5917 | ||
5918 | if Is_Transfer (Last_Stm) then | |
5919 | return; | |
5920 | ||
5921 | -- Check cases of explicit non-indirect procedure calls | |
5922 | ||
5923 | elsif Kind = N_Procedure_Call_Statement | |
5924 | and then Is_Entity_Name (Name (Last_Stm)) | |
5925 | then | |
5926 | -- Check call to Raise_Exception procedure which is treated | |
5927 | -- specially, as is a call to Reraise_Occurrence. | |
5928 | ||
5929 | -- We suppress the warning in these cases since it is likely that | |
5930 | -- the programmer really does not expect to deal with the case | |
5931 | -- of Null_Occurrence, and thus would find a warning about a | |
5932 | -- missing return curious, and raising Program_Error does not | |
5933 | -- seem such a bad behavior if this does occur. | |
5934 | ||
c8ef728f ES |
5935 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
5936 | -- behavior will be to raise Constraint_Error (see AI-329). | |
5937 | ||
996ae0b0 RK |
5938 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
5939 | or else | |
5940 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
5941 | then | |
5942 | Raise_Exception_Call := True; | |
5943 | ||
5944 | -- For Raise_Exception call, test first argument, if it is | |
5945 | -- an attribute reference for a 'Identity call, then we know | |
5946 | -- that the call cannot possibly return. | |
5947 | ||
5948 | declare | |
5949 | Arg : constant Node_Id := | |
5950 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
5951 | begin |
5952 | if Nkind (Arg) = N_Attribute_Reference | |
5953 | and then Attribute_Name (Arg) = Name_Identity | |
5954 | then | |
5955 | return; | |
5956 | end if; | |
5957 | end; | |
5958 | end if; | |
5959 | ||
5960 | -- If statement, need to look inside if there is an else and check | |
5961 | -- each constituent statement sequence for proper termination. | |
5962 | ||
5963 | elsif Kind = N_If_Statement | |
5964 | and then Present (Else_Statements (Last_Stm)) | |
5965 | then | |
5966 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
5967 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
5968 | ||
5969 | if Present (Elsif_Parts (Last_Stm)) then | |
5970 | declare | |
5971 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
5972 | ||
5973 | begin | |
5974 | while Present (Elsif_Part) loop | |
5975 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
5976 | Next (Elsif_Part); | |
5977 | end loop; | |
5978 | end; | |
5979 | end if; | |
5980 | ||
5981 | return; | |
5982 | ||
5983 | -- Case statement, check each case for proper termination | |
5984 | ||
5985 | elsif Kind = N_Case_Statement then | |
5986 | declare | |
5987 | Case_Alt : Node_Id; | |
996ae0b0 RK |
5988 | begin |
5989 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
5990 | while Present (Case_Alt) loop | |
5991 | Check_Statement_Sequence (Statements (Case_Alt)); | |
5992 | Next_Non_Pragma (Case_Alt); | |
5993 | end loop; | |
5994 | end; | |
5995 | ||
5996 | return; | |
5997 | ||
5998 | -- Block statement, check its handled sequence of statements | |
5999 | ||
6000 | elsif Kind = N_Block_Statement then | |
6001 | declare | |
6002 | Err1 : Boolean; | |
6003 | ||
6004 | begin | |
6005 | Check_Returns | |
6006 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
6007 | ||
6008 | if Err1 then | |
6009 | Err := True; | |
6010 | end if; | |
6011 | ||
6012 | return; | |
6013 | end; | |
6014 | ||
6015 | -- Loop statement. If there is an iteration scheme, we can definitely | |
6016 | -- fall out of the loop. Similarly if there is an exit statement, we | |
6017 | -- can fall out. In either case we need a following return. | |
6018 | ||
6019 | elsif Kind = N_Loop_Statement then | |
6020 | if Present (Iteration_Scheme (Last_Stm)) | |
6021 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
6022 | then | |
6023 | null; | |
6024 | ||
f3d57416 RW |
6025 | -- A loop with no exit statement or iteration scheme is either |
6026 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
6027 | -- In either case, no warning is required. |
6028 | ||
6029 | else | |
6030 | return; | |
6031 | end if; | |
6032 | ||
6033 | -- Timed entry call, check entry call and delay alternatives | |
6034 | ||
6035 | -- Note: in expanded code, the timed entry call has been converted | |
6036 | -- to a set of expanded statements on which the check will work | |
6037 | -- correctly in any case. | |
6038 | ||
6039 | elsif Kind = N_Timed_Entry_Call then | |
6040 | declare | |
6041 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6042 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
6043 | ||
6044 | begin | |
6045 | -- If statement sequence of entry call alternative is missing, | |
6046 | -- then we can definitely fall through, and we post the error | |
6047 | -- message on the entry call alternative itself. | |
6048 | ||
6049 | if No (Statements (ECA)) then | |
6050 | Last_Stm := ECA; | |
6051 | ||
6052 | -- If statement sequence of delay alternative is missing, then | |
6053 | -- we can definitely fall through, and we post the error | |
6054 | -- message on the delay alternative itself. | |
6055 | ||
6056 | -- Note: if both ECA and DCA are missing the return, then we | |
6057 | -- post only one message, should be enough to fix the bugs. | |
6058 | -- If not we will get a message next time on the DCA when the | |
a90bd866 | 6059 | -- ECA is fixed. |
996ae0b0 RK |
6060 | |
6061 | elsif No (Statements (DCA)) then | |
6062 | Last_Stm := DCA; | |
6063 | ||
6064 | -- Else check both statement sequences | |
6065 | ||
6066 | else | |
6067 | Check_Statement_Sequence (Statements (ECA)); | |
6068 | Check_Statement_Sequence (Statements (DCA)); | |
6069 | return; | |
6070 | end if; | |
6071 | end; | |
6072 | ||
6073 | -- Conditional entry call, check entry call and else part | |
6074 | ||
6075 | -- Note: in expanded code, the conditional entry call has been | |
6076 | -- converted to a set of expanded statements on which the check | |
6077 | -- will work correctly in any case. | |
6078 | ||
6079 | elsif Kind = N_Conditional_Entry_Call then | |
6080 | declare | |
6081 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6082 | ||
6083 | begin | |
6084 | -- If statement sequence of entry call alternative is missing, | |
6085 | -- then we can definitely fall through, and we post the error | |
6086 | -- message on the entry call alternative itself. | |
6087 | ||
6088 | if No (Statements (ECA)) then | |
6089 | Last_Stm := ECA; | |
6090 | ||
6091 | -- Else check statement sequence and else part | |
6092 | ||
6093 | else | |
6094 | Check_Statement_Sequence (Statements (ECA)); | |
6095 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6096 | return; | |
6097 | end if; | |
6098 | end; | |
6099 | end if; | |
6100 | ||
6101 | -- If we fall through, issue appropriate message | |
6102 | ||
6103 | if Mode = 'F' then | |
7b27e183 AC |
6104 | |
6105 | -- Kill warning if last statement is a raise exception call, | |
6106 | -- or a pragma Assert (False). Note that with assertions enabled, | |
6107 | -- such a pragma has been converted into a raise exception call | |
6108 | -- already, so the Assert_False is for the assertions off case. | |
6109 | ||
6110 | if not Raise_Exception_Call and then not Assert_False then | |
b465ef6f AC |
6111 | |
6112 | -- In GNATprove mode, it is an error to have a missing return | |
6113 | ||
43417b90 | 6114 | Error_Msg_Warn := SPARK_Mode /= On; |
7b27e183 AC |
6115 | |
6116 | -- Issue error message or warning | |
6117 | ||
4a28b181 AC |
6118 | Error_Msg_N |
6119 | ("RETURN statement missing following this statement<<!", | |
6120 | Last_Stm); | |
6121 | Error_Msg_N | |
6122 | ("\Program_Error ]<<!", Last_Stm); | |
996ae0b0 RK |
6123 | end if; |
6124 | ||
6125 | -- Note: we set Err even though we have not issued a warning | |
6126 | -- because we still have a case of a missing return. This is | |
6127 | -- an extremely marginal case, probably will never be noticed | |
6128 | -- but we might as well get it right. | |
6129 | ||
6130 | Err := True; | |
6131 | ||
c8ef728f ES |
6132 | -- Otherwise we have the case of a procedure marked No_Return |
6133 | ||
996ae0b0 | 6134 | else |
800621e0 | 6135 | if not Raise_Exception_Call then |
4a28b181 AC |
6136 | if GNATprove_Mode then |
6137 | Error_Msg_N | |
6138 | ("implied return after this statement " | |
6139 | & "would have raised Program_Error", Last_Stm); | |
6140 | else | |
6141 | Error_Msg_N | |
6142 | ("implied return after this statement " | |
6143 | & "will raise Program_Error??", Last_Stm); | |
6144 | end if; | |
6145 | ||
43417b90 | 6146 | Error_Msg_Warn := SPARK_Mode /= On; |
800621e0 | 6147 | Error_Msg_NE |
4a28b181 | 6148 | ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
800621e0 | 6149 | end if; |
c8ef728f ES |
6150 | |
6151 | declare | |
6152 | RE : constant Node_Id := | |
6153 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
6154 | Reason => PE_Implicit_Return); | |
6155 | begin | |
6156 | Insert_After (Last_Stm, RE); | |
6157 | Analyze (RE); | |
6158 | end; | |
996ae0b0 RK |
6159 | end if; |
6160 | end Check_Statement_Sequence; | |
6161 | ||
6162 | -- Start of processing for Check_Returns | |
6163 | ||
6164 | begin | |
6165 | Err := False; | |
6166 | Check_Statement_Sequence (Statements (HSS)); | |
6167 | ||
6168 | if Present (Exception_Handlers (HSS)) then | |
6169 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
6170 | while Present (Handler) loop | |
6171 | Check_Statement_Sequence (Statements (Handler)); | |
6172 | Next_Non_Pragma (Handler); | |
6173 | end loop; | |
6174 | end if; | |
6175 | end Check_Returns; | |
6176 | ||
6177 | ---------------------------- | |
6178 | -- Check_Subprogram_Order -- | |
6179 | ---------------------------- | |
6180 | ||
6181 | procedure Check_Subprogram_Order (N : Node_Id) is | |
6182 | ||
6183 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
6184 | -- This is used to check if S1 > S2 in the sense required by this test, |
6185 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 6186 | |
82c80734 RD |
6187 | ----------------------------- |
6188 | -- Subprogram_Name_Greater -- | |
6189 | ----------------------------- | |
6190 | ||
996ae0b0 RK |
6191 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
6192 | L1, L2 : Positive; | |
6193 | N1, N2 : Natural; | |
6194 | ||
6195 | begin | |
67336960 AC |
6196 | -- Deal with special case where names are identical except for a |
6197 | -- numerical suffix. These are handled specially, taking the numeric | |
6198 | -- ordering from the suffix into account. | |
996ae0b0 RK |
6199 | |
6200 | L1 := S1'Last; | |
6201 | while S1 (L1) in '0' .. '9' loop | |
6202 | L1 := L1 - 1; | |
6203 | end loop; | |
6204 | ||
6205 | L2 := S2'Last; | |
6206 | while S2 (L2) in '0' .. '9' loop | |
6207 | L2 := L2 - 1; | |
6208 | end loop; | |
6209 | ||
67336960 | 6210 | -- If non-numeric parts non-equal, do straight compare |
996ae0b0 | 6211 | |
67336960 AC |
6212 | if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
6213 | return S1 > S2; | |
996ae0b0 RK |
6214 | |
6215 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
6216 | -- that a missing suffix is treated as numeric zero in this test. | |
6217 | ||
6218 | else | |
6219 | N1 := 0; | |
6220 | while L1 < S1'Last loop | |
6221 | L1 := L1 + 1; | |
6222 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
6223 | end loop; | |
6224 | ||
6225 | N2 := 0; | |
6226 | while L2 < S2'Last loop | |
6227 | L2 := L2 + 1; | |
6228 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
6229 | end loop; | |
6230 | ||
6231 | return N1 > N2; | |
6232 | end if; | |
6233 | end Subprogram_Name_Greater; | |
6234 | ||
6235 | -- Start of processing for Check_Subprogram_Order | |
6236 | ||
6237 | begin | |
6238 | -- Check body in alpha order if this is option | |
6239 | ||
fbf5a39b | 6240 | if Style_Check |
bc202b70 | 6241 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
6242 | and then Nkind (N) = N_Subprogram_Body |
6243 | and then Comes_From_Source (N) | |
6244 | and then In_Extended_Main_Source_Unit (N) | |
6245 | then | |
6246 | declare | |
6247 | LSN : String_Ptr | |
6248 | renames Scope_Stack.Table | |
6249 | (Scope_Stack.Last).Last_Subprogram_Name; | |
6250 | ||
6251 | Body_Id : constant Entity_Id := | |
6252 | Defining_Entity (Specification (N)); | |
6253 | ||
6254 | begin | |
6255 | Get_Decoded_Name_String (Chars (Body_Id)); | |
6256 | ||
6257 | if LSN /= null then | |
6258 | if Subprogram_Name_Greater | |
6259 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
6260 | then | |
6261 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
6262 | end if; | |
6263 | ||
6264 | Free (LSN); | |
6265 | end if; | |
6266 | ||
6267 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
6268 | end; | |
6269 | end if; | |
6270 | end Check_Subprogram_Order; | |
6271 | ||
6272 | ------------------------------ | |
6273 | -- Check_Subtype_Conformant -- | |
6274 | ------------------------------ | |
6275 | ||
6276 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
6277 | (New_Id : Entity_Id; |
6278 | Old_Id : Entity_Id; | |
6279 | Err_Loc : Node_Id := Empty; | |
f307415a AC |
6280 | Skip_Controlling_Formals : Boolean := False; |
6281 | Get_Inst : Boolean := False) | |
996ae0b0 RK |
6282 | is |
6283 | Result : Boolean; | |
81db9d77 | 6284 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6285 | begin |
6286 | Check_Conformance | |
ce2b6ba5 | 6287 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
f307415a AC |
6288 | Skip_Controlling_Formals => Skip_Controlling_Formals, |
6289 | Get_Inst => Get_Inst); | |
996ae0b0 RK |
6290 | end Check_Subtype_Conformant; |
6291 | ||
6292 | --------------------------- | |
6293 | -- Check_Type_Conformant -- | |
6294 | --------------------------- | |
6295 | ||
6296 | procedure Check_Type_Conformant | |
6297 | (New_Id : Entity_Id; | |
6298 | Old_Id : Entity_Id; | |
6299 | Err_Loc : Node_Id := Empty) | |
6300 | is | |
6301 | Result : Boolean; | |
81db9d77 | 6302 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6303 | begin |
6304 | Check_Conformance | |
6305 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
6306 | end Check_Type_Conformant; | |
6307 | ||
806f6d37 AC |
6308 | --------------------------- |
6309 | -- Can_Override_Operator -- | |
6310 | --------------------------- | |
6311 | ||
6312 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
6313 | Typ : Entity_Id; | |
f146302c | 6314 | |
806f6d37 AC |
6315 | begin |
6316 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
6317 | return False; | |
6318 | ||
6319 | else | |
6320 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
6321 | ||
f146302c AC |
6322 | -- Check explicitly that the operation is a primitive of the type |
6323 | ||
806f6d37 | 6324 | return Operator_Matches_Spec (Subp, Subp) |
f146302c | 6325 | and then not Is_Generic_Type (Typ) |
806f6d37 AC |
6326 | and then Scope (Subp) = Scope (Typ) |
6327 | and then not Is_Class_Wide_Type (Typ); | |
6328 | end if; | |
6329 | end Can_Override_Operator; | |
6330 | ||
996ae0b0 RK |
6331 | ---------------------- |
6332 | -- Conforming_Types -- | |
6333 | ---------------------- | |
6334 | ||
6335 | function Conforming_Types | |
6336 | (T1 : Entity_Id; | |
6337 | T2 : Entity_Id; | |
6338 | Ctype : Conformance_Type; | |
d05ef0ab | 6339 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
6340 | is |
6341 | Type_1 : Entity_Id := T1; | |
6342 | Type_2 : Entity_Id := T2; | |
af4b9434 | 6343 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
6344 | |
6345 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
6346 | -- If neither T1 nor T2 are generic actual types, or if they are in |
6347 | -- different scopes (e.g. parent and child instances), then verify that | |
6348 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
6349 | -- subtype chain. The whole purpose of this procedure is to prevent | |
6350 | -- spurious ambiguities in an instantiation that may arise if two | |
6351 | -- distinct generic types are instantiated with the same actual. | |
6352 | ||
5d37ba92 ES |
6353 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
6354 | -- An access parameter can designate an incomplete type. If the | |
6355 | -- incomplete type is the limited view of a type from a limited_ | |
6356 | -- with_clause, check whether the non-limited view is available. If | |
6357 | -- it is a (non-limited) incomplete type, get the full view. | |
6358 | ||
0a36105d JM |
6359 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
6360 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
6361 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
6362 | -- with view of a type is used in a subprogram declaration and the | |
6363 | -- subprogram body is in the scope of a regular with clause for the | |
6364 | -- same unit. In such a case, the two type entities can be considered | |
6365 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
6366 | |
6367 | ---------------------- | |
6368 | -- Base_Types_Match -- | |
6369 | ---------------------- | |
6370 | ||
6371 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
8fde064e AC |
6372 | BT1 : constant Entity_Id := Base_Type (T1); |
6373 | BT2 : constant Entity_Id := Base_Type (T2); | |
6374 | ||
996ae0b0 RK |
6375 | begin |
6376 | if T1 = T2 then | |
6377 | return True; | |
6378 | ||
8fde064e | 6379 | elsif BT1 = BT2 then |
996ae0b0 | 6380 | |
0a36105d | 6381 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
6382 | -- check that the generic actual is an ancestor subtype of the |
6383 | -- other ???. | |
586ecbf3 | 6384 | |
70f4ad20 AC |
6385 | -- See code in Find_Corresponding_Spec that applies an additional |
6386 | -- filter to handle accidental amiguities in instances. | |
996ae0b0 RK |
6387 | |
6388 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
6389 | or else not Is_Generic_Actual_Type (T2) |
6390 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 6391 | |
8fde064e | 6392 | -- If T2 is a generic actual type it is declared as the subtype of |
2995860f AC |
6393 | -- the actual. If that actual is itself a subtype we need to use its |
6394 | -- own base type to check for compatibility. | |
8fde064e AC |
6395 | |
6396 | elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then | |
6397 | return True; | |
6398 | ||
6399 | elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then | |
6400 | return True; | |
6401 | ||
0a36105d JM |
6402 | else |
6403 | return False; | |
6404 | end if; | |
6405 | end Base_Types_Match; | |
aa720a54 | 6406 | |
5d37ba92 ES |
6407 | -------------------------- |
6408 | -- Find_Designated_Type -- | |
6409 | -------------------------- | |
6410 | ||
6411 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
6412 | Desig : Entity_Id; | |
6413 | ||
6414 | begin | |
6415 | Desig := Directly_Designated_Type (T); | |
6416 | ||
6417 | if Ekind (Desig) = E_Incomplete_Type then | |
6418 | ||
6419 | -- If regular incomplete type, get full view if available | |
6420 | ||
6421 | if Present (Full_View (Desig)) then | |
6422 | Desig := Full_View (Desig); | |
6423 | ||
6424 | -- If limited view of a type, get non-limited view if available, | |
6425 | -- and check again for a regular incomplete type. | |
6426 | ||
6427 | elsif Present (Non_Limited_View (Desig)) then | |
6428 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
6429 | end if; | |
6430 | end if; | |
6431 | ||
6432 | return Desig; | |
6433 | end Find_Designated_Type; | |
6434 | ||
0a36105d JM |
6435 | ------------------------------- |
6436 | -- Matches_Limited_With_View -- | |
6437 | ------------------------------- | |
6438 | ||
6439 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
6440 | begin | |
6441 | -- In some cases a type imported through a limited_with clause, and | |
6442 | -- its nonlimited view are both visible, for example in an anonymous | |
6443 | -- access-to-class-wide type in a formal. Both entities designate the | |
6444 | -- same type. | |
6445 | ||
7b56a91b | 6446 | if From_Limited_With (T1) and then T2 = Available_View (T1) then |
aa720a54 AC |
6447 | return True; |
6448 | ||
7b56a91b | 6449 | elsif From_Limited_With (T2) and then T1 = Available_View (T2) then |
41251c60 | 6450 | return True; |
3e24afaa | 6451 | |
7b56a91b AC |
6452 | elsif From_Limited_With (T1) |
6453 | and then From_Limited_With (T2) | |
3e24afaa AC |
6454 | and then Available_View (T1) = Available_View (T2) |
6455 | then | |
6456 | return True; | |
41251c60 | 6457 | |
996ae0b0 RK |
6458 | else |
6459 | return False; | |
6460 | end if; | |
0a36105d | 6461 | end Matches_Limited_With_View; |
996ae0b0 | 6462 | |
ec4867fa | 6463 | -- Start of processing for Conforming_Types |
758c442c | 6464 | |
996ae0b0 | 6465 | begin |
8fde064e AC |
6466 | -- The context is an instance association for a formal access-to- |
6467 | -- subprogram type; the formal parameter types require mapping because | |
6468 | -- they may denote other formal parameters of the generic unit. | |
996ae0b0 RK |
6469 | |
6470 | if Get_Inst then | |
6471 | Type_1 := Get_Instance_Of (T1); | |
6472 | Type_2 := Get_Instance_Of (T2); | |
6473 | end if; | |
6474 | ||
0a36105d JM |
6475 | -- If one of the types is a view of the other introduced by a limited |
6476 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 6477 | |
0a36105d JM |
6478 | if Matches_Limited_With_View (T1, T2) then |
6479 | return True; | |
6480 | ||
6481 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
6482 | return Ctype <= Mode_Conformant |
6483 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
6484 | ||
6485 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
6486 | and then Present (Full_View (Type_1)) | |
6487 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
6488 | then | |
6489 | return Ctype <= Mode_Conformant | |
6490 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
6491 | ||
6492 | elsif Ekind (Type_2) = E_Incomplete_Type | |
6493 | and then Present (Full_View (Type_2)) | |
6494 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6495 | then | |
6496 | return Ctype <= Mode_Conformant | |
6497 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
6498 | |
6499 | elsif Is_Private_Type (Type_2) | |
6500 | and then In_Instance | |
6501 | and then Present (Full_View (Type_2)) | |
6502 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6503 | then | |
6504 | return Ctype <= Mode_Conformant | |
6505 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
996ae0b0 RK |
6506 | end if; |
6507 | ||
0a36105d | 6508 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
466c2127 AC |
6509 | -- treated recursively because they carry a signature. As far as |
6510 | -- conformance is concerned, convention plays no role, and either | |
6511 | -- or both could be access to protected subprograms. | |
af4b9434 AC |
6512 | |
6513 | Are_Anonymous_Access_To_Subprogram_Types := | |
466c2127 AC |
6514 | Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
6515 | E_Anonymous_Access_Protected_Subprogram_Type) | |
f937473f | 6516 | and then |
466c2127 AC |
6517 | Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
6518 | E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 6519 | |
996ae0b0 | 6520 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
6521 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
6522 | -- the base types because we may have built internal subtype entities | |
6523 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 6524 | |
5d37ba92 ES |
6525 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
6526 | and then | |
6527 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
8fde064e AC |
6528 | |
6529 | -- Ada 2005 (AI-254) | |
6530 | ||
6531 | or else Are_Anonymous_Access_To_Subprogram_Types | |
996ae0b0 RK |
6532 | then |
6533 | declare | |
6534 | Desig_1 : Entity_Id; | |
6535 | Desig_2 : Entity_Id; | |
6536 | ||
6537 | begin | |
885c4871 | 6538 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 6539 | -- subtype conformance. |
9dcb52e1 | 6540 | |
0791fbe9 | 6541 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
6542 | and then Ctype >= Subtype_Conformant |
6543 | and then | |
6544 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
6545 | then | |
6546 | return False; | |
996ae0b0 RK |
6547 | end if; |
6548 | ||
5d37ba92 | 6549 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 6550 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 6551 | |
5d37ba92 | 6552 | -- If the context is an instance association for a formal |
82c80734 RD |
6553 | -- access-to-subprogram type; formal access parameter designated |
6554 | -- types require mapping because they may denote other formal | |
6555 | -- parameters of the generic unit. | |
996ae0b0 RK |
6556 | |
6557 | if Get_Inst then | |
6558 | Desig_1 := Get_Instance_Of (Desig_1); | |
6559 | Desig_2 := Get_Instance_Of (Desig_2); | |
6560 | end if; | |
6561 | ||
82c80734 RD |
6562 | -- It is possible for a Class_Wide_Type to be introduced for an |
6563 | -- incomplete type, in which case there is a separate class_ wide | |
6564 | -- type for the full view. The types conform if their Etypes | |
6565 | -- conform, i.e. one may be the full view of the other. This can | |
6566 | -- only happen in the context of an access parameter, other uses | |
6567 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 6568 | |
fbf5a39b | 6569 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
6570 | and then |
6571 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
6572 | then |
6573 | return | |
fbf5a39b AC |
6574 | Conforming_Types |
6575 | (Etype (Base_Type (Desig_1)), | |
6576 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
6577 | |
6578 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 6579 | if Ada_Version < Ada_2005 then |
758c442c GD |
6580 | return Ctype = Type_Conformant |
6581 | or else | |
af4b9434 AC |
6582 | Subtypes_Statically_Match (Desig_1, Desig_2); |
6583 | ||
758c442c GD |
6584 | -- We must check the conformance of the signatures themselves |
6585 | ||
6586 | else | |
6587 | declare | |
6588 | Conformant : Boolean; | |
6589 | begin | |
6590 | Check_Conformance | |
6591 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
6592 | return Conformant; | |
6593 | end; | |
6594 | end if; | |
6595 | ||
996ae0b0 RK |
6596 | else |
6597 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
6598 | and then (Ctype = Type_Conformant | |
8fde064e AC |
6599 | or else |
6600 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
6601 | end if; |
6602 | end; | |
6603 | ||
6604 | -- Otherwise definitely no match | |
6605 | ||
6606 | else | |
c8ef728f ES |
6607 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
6608 | and then Is_Access_Type (Type_2)) | |
6609 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
8fde064e | 6610 | and then Is_Access_Type (Type_1))) |
c8ef728f ES |
6611 | and then |
6612 | Conforming_Types | |
6613 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
6614 | then | |
6615 | May_Hide_Profile := True; | |
6616 | end if; | |
6617 | ||
996ae0b0 RK |
6618 | return False; |
6619 | end if; | |
996ae0b0 RK |
6620 | end Conforming_Types; |
6621 | ||
6622 | -------------------------- | |
6623 | -- Create_Extra_Formals -- | |
6624 | -------------------------- | |
6625 | ||
6626 | procedure Create_Extra_Formals (E : Entity_Id) is | |
6627 | Formal : Entity_Id; | |
ec4867fa | 6628 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
6629 | Last_Extra : Entity_Id; |
6630 | Formal_Type : Entity_Id; | |
6631 | P_Formal : Entity_Id := Empty; | |
6632 | ||
ec4867fa ES |
6633 | function Add_Extra_Formal |
6634 | (Assoc_Entity : Entity_Id; | |
6635 | Typ : Entity_Id; | |
6636 | Scope : Entity_Id; | |
6637 | Suffix : String) return Entity_Id; | |
6638 | -- Add an extra formal to the current list of formals and extra formals. | |
6639 | -- The extra formal is added to the end of the list of extra formals, | |
6640 | -- and also returned as the result. These formals are always of mode IN. | |
6641 | -- The new formal has the type Typ, is declared in Scope, and its name | |
6642 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
6643 | -- The following suffixes are currently used. They should not be changed |
6644 | -- without coordinating with CodePeer, which makes use of these to | |
6645 | -- provide better messages. | |
6646 | ||
d92eccc3 AC |
6647 | -- O denotes the Constrained bit. |
6648 | -- L denotes the accessibility level. | |
cd5a9750 AC |
6649 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
6650 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 6651 | |
fbf5a39b AC |
6652 | ---------------------- |
6653 | -- Add_Extra_Formal -- | |
6654 | ---------------------- | |
6655 | ||
ec4867fa ES |
6656 | function Add_Extra_Formal |
6657 | (Assoc_Entity : Entity_Id; | |
6658 | Typ : Entity_Id; | |
6659 | Scope : Entity_Id; | |
6660 | Suffix : String) return Entity_Id | |
6661 | is | |
996ae0b0 | 6662 | EF : constant Entity_Id := |
ec4867fa ES |
6663 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
6664 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 6665 | Suffix => Suffix)); |
996ae0b0 RK |
6666 | |
6667 | begin | |
82c80734 RD |
6668 | -- A little optimization. Never generate an extra formal for the |
6669 | -- _init operand of an initialization procedure, since it could | |
6670 | -- never be used. | |
996ae0b0 RK |
6671 | |
6672 | if Chars (Formal) = Name_uInit then | |
6673 | return Empty; | |
6674 | end if; | |
6675 | ||
6676 | Set_Ekind (EF, E_In_Parameter); | |
6677 | Set_Actual_Subtype (EF, Typ); | |
6678 | Set_Etype (EF, Typ); | |
ec4867fa | 6679 | Set_Scope (EF, Scope); |
996ae0b0 RK |
6680 | Set_Mechanism (EF, Default_Mechanism); |
6681 | Set_Formal_Validity (EF); | |
6682 | ||
ec4867fa ES |
6683 | if No (First_Extra) then |
6684 | First_Extra := EF; | |
6685 | Set_Extra_Formals (Scope, First_Extra); | |
6686 | end if; | |
6687 | ||
6688 | if Present (Last_Extra) then | |
6689 | Set_Extra_Formal (Last_Extra, EF); | |
6690 | end if; | |
6691 | ||
996ae0b0 | 6692 | Last_Extra := EF; |
ec4867fa | 6693 | |
996ae0b0 RK |
6694 | return EF; |
6695 | end Add_Extra_Formal; | |
6696 | ||
6697 | -- Start of processing for Create_Extra_Formals | |
6698 | ||
6699 | begin | |
8fde064e AC |
6700 | -- We never generate extra formals if expansion is not active because we |
6701 | -- don't need them unless we are generating code. | |
f937473f RD |
6702 | |
6703 | if not Expander_Active then | |
6704 | return; | |
6705 | end if; | |
6706 | ||
e2441021 AC |
6707 | -- No need to generate extra formals in interface thunks whose target |
6708 | -- primitive has no extra formals. | |
6709 | ||
6710 | if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then | |
6711 | return; | |
6712 | end if; | |
6713 | ||
82c80734 | 6714 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 6715 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 6716 | -- for extra formals. |
996ae0b0 RK |
6717 | |
6718 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
6719 | P_Formal := First_Formal (Alias (E)); | |
6720 | end if; | |
6721 | ||
6722 | Last_Extra := Empty; | |
6723 | Formal := First_Formal (E); | |
6724 | while Present (Formal) loop | |
6725 | Last_Extra := Formal; | |
6726 | Next_Formal (Formal); | |
6727 | end loop; | |
6728 | ||
f937473f | 6729 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
6730 | -- situation may arise for subprogram types created as part of |
6731 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 | 6732 | |
8fde064e | 6733 | if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
996ae0b0 RK |
6734 | return; |
6735 | end if; | |
6736 | ||
19590d70 GD |
6737 | -- If the subprogram is a predefined dispatching subprogram then don't |
6738 | -- generate any extra constrained or accessibility level formals. In | |
6739 | -- general we suppress these for internal subprograms (by not calling | |
6740 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
6741 | -- generated stream attributes do get passed through because extra | |
6742 | -- build-in-place formals are needed in some cases (limited 'Input). | |
6743 | ||
bac7206d | 6744 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 6745 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
6746 | end if; |
6747 | ||
996ae0b0 | 6748 | Formal := First_Formal (E); |
996ae0b0 RK |
6749 | while Present (Formal) loop |
6750 | ||
6751 | -- Create extra formal for supporting the attribute 'Constrained. | |
6752 | -- The case of a private type view without discriminants also | |
6753 | -- requires the extra formal if the underlying type has defaulted | |
6754 | -- discriminants. | |
6755 | ||
6756 | if Ekind (Formal) /= E_In_Parameter then | |
6757 | if Present (P_Formal) then | |
6758 | Formal_Type := Etype (P_Formal); | |
6759 | else | |
6760 | Formal_Type := Etype (Formal); | |
6761 | end if; | |
6762 | ||
5d09245e AC |
6763 | -- Do not produce extra formals for Unchecked_Union parameters. |
6764 | -- Jump directly to the end of the loop. | |
6765 | ||
6766 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
6767 | goto Skip_Extra_Formal_Generation; | |
6768 | end if; | |
6769 | ||
996ae0b0 RK |
6770 | if not Has_Discriminants (Formal_Type) |
6771 | and then Ekind (Formal_Type) in Private_Kind | |
6772 | and then Present (Underlying_Type (Formal_Type)) | |
6773 | then | |
6774 | Formal_Type := Underlying_Type (Formal_Type); | |
6775 | end if; | |
6776 | ||
5e5db3b4 GD |
6777 | -- Suppress the extra formal if formal's subtype is constrained or |
6778 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
6779 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
6780 | -- can have defaulted discriminants, but 'Constrained is required | |
6781 | -- to return True, so the formal is never needed (see AI05-0214). | |
6782 | -- Note that this ensures consistency of calling sequences for | |
6783 | -- dispatching operations when some types in a class have defaults | |
6784 | -- on discriminants and others do not (and requiring the extra | |
6785 | -- formal would introduce distributed overhead). | |
6786 | ||
b5bdffcc AC |
6787 | -- If the type does not have a completion yet, treat as prior to |
6788 | -- Ada 2012 for consistency. | |
6789 | ||
996ae0b0 | 6790 | if Has_Discriminants (Formal_Type) |
f937473f RD |
6791 | and then not Is_Constrained (Formal_Type) |
6792 | and then not Is_Indefinite_Subtype (Formal_Type) | |
5e5db3b4 | 6793 | and then (Ada_Version < Ada_2012 |
b5bdffcc AC |
6794 | or else No (Underlying_Type (Formal_Type)) |
6795 | or else not | |
6796 | (Is_Limited_Type (Formal_Type) | |
6797 | and then | |
6798 | (Is_Tagged_Type | |
6799 | (Underlying_Type (Formal_Type))))) | |
996ae0b0 RK |
6800 | then |
6801 | Set_Extra_Constrained | |
d92eccc3 | 6802 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
6803 | end if; |
6804 | end if; | |
6805 | ||
0a36105d JM |
6806 | -- Create extra formal for supporting accessibility checking. This |
6807 | -- is done for both anonymous access formals and formals of named | |
6808 | -- access types that are marked as controlling formals. The latter | |
6809 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
6810 | -- type and substitutes the types of access-to-class-wide actuals | |
6811 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
6812 | -- Base_Type is applied because in cases where there is a null |
6813 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
6814 | |
6815 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 6816 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
6817 | -- package in which it resides. However, we do not suppress it |
6818 | -- simply if the scope has accessibility checks suppressed, since | |
6819 | -- this could cause trouble when clients are compiled with a | |
6820 | -- different suppression setting. The explicit checks at the | |
6821 | -- package level are safe from this point of view. | |
996ae0b0 | 6822 | |
5d37ba92 | 6823 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 6824 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 6825 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 6826 | and then not |
fbf5a39b | 6827 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 6828 | or else |
fbf5a39b | 6829 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 6830 | and then |
c8ef728f | 6831 | (No (P_Formal) |
996ae0b0 RK |
6832 | or else Present (Extra_Accessibility (P_Formal))) |
6833 | then | |
811c6a85 | 6834 | Set_Extra_Accessibility |
d92eccc3 | 6835 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
6836 | end if; |
6837 | ||
5d09245e AC |
6838 | -- This label is required when skipping extra formal generation for |
6839 | -- Unchecked_Union parameters. | |
6840 | ||
6841 | <<Skip_Extra_Formal_Generation>> | |
6842 | ||
f937473f RD |
6843 | if Present (P_Formal) then |
6844 | Next_Formal (P_Formal); | |
6845 | end if; | |
6846 | ||
996ae0b0 RK |
6847 | Next_Formal (Formal); |
6848 | end loop; | |
ec4867fa | 6849 | |
63585f75 SB |
6850 | <<Test_For_Func_Result_Extras>> |
6851 | ||
6852 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
6853 | -- function call is ... determined by the point of call ...". | |
6854 | ||
6855 | if Needs_Result_Accessibility_Level (E) then | |
6856 | Set_Extra_Accessibility_Of_Result | |
6857 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
6858 | end if; | |
19590d70 | 6859 | |
ec4867fa | 6860 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
6861 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
6862 | ||
0791fbe9 | 6863 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 6864 | declare |
f937473f | 6865 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 6866 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 6867 | Formal_Typ : Entity_Id; |
f937473f | 6868 | |
2fcc44fa | 6869 | Discard : Entity_Id; |
f937473f | 6870 | pragma Warnings (Off, Discard); |
ec4867fa ES |
6871 | |
6872 | begin | |
f937473f | 6873 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
6874 | -- add a 4-state formal indicating whether the return object is |
6875 | -- allocated by the caller (1), or should be allocated by the | |
6876 | -- callee on the secondary stack (2), in the global heap (3), or | |
6877 | -- in a user-defined storage pool (4). For the moment we just use | |
6878 | -- Natural for the type of this formal. Note that this formal | |
6879 | -- isn't usually needed in the case where the result subtype is | |
6880 | -- constrained, but it is needed when the function has a tagged | |
6881 | -- result, because generally such functions can be called in a | |
6882 | -- dispatching context and such calls must be handled like calls | |
6883 | -- to a class-wide function. | |
0a36105d | 6884 | |
1bb6e262 | 6885 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
6886 | Discard := |
6887 | Add_Extra_Formal | |
6888 | (E, Standard_Natural, | |
6889 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 6890 | |
8417f4b2 | 6891 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 AC |
6892 | -- use a user-defined pool. This formal is not added on |
6893 | -- .NET/JVM/ZFP as those targets do not support pools. | |
200b7162 | 6894 | |
ea10ca9c AC |
6895 | if VM_Target = No_VM |
6896 | and then RTE_Available (RE_Root_Storage_Pool_Ptr) | |
3e452820 | 6897 | then |
8417f4b2 AC |
6898 | Discard := |
6899 | Add_Extra_Formal | |
6900 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
6901 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
6902 | end if; | |
f937473f | 6903 | end if; |
ec4867fa | 6904 | |
df3e68b1 | 6905 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 6906 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 6907 | |
ca5af305 | 6908 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
6909 | Discard := |
6910 | Add_Extra_Formal | |
ca5af305 AC |
6911 | (E, RTE (RE_Finalization_Master_Ptr), |
6912 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
6913 | end if; |
6914 | ||
94bbf008 AC |
6915 | -- When the result type contains tasks, add two extra formals: the |
6916 | -- master of the tasks to be created, and the caller's activation | |
6917 | -- chain. | |
f937473f | 6918 | |
1a36a0cd | 6919 | if Has_Task (Full_Subt) then |
f937473f RD |
6920 | Discard := |
6921 | Add_Extra_Formal | |
6922 | (E, RTE (RE_Master_Id), | |
af89615f | 6923 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
6924 | Discard := |
6925 | Add_Extra_Formal | |
6926 | (E, RTE (RE_Activation_Chain_Access), | |
6927 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
6928 | end if; | |
ec4867fa | 6929 | |
f937473f RD |
6930 | -- All build-in-place functions get an extra formal that will be |
6931 | -- passed the address of the return object within the caller. | |
ec4867fa | 6932 | |
1a36a0cd AC |
6933 | Formal_Typ := |
6934 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 6935 | |
1a36a0cd AC |
6936 | Set_Directly_Designated_Type (Formal_Typ, Result_Subt); |
6937 | Set_Etype (Formal_Typ, Formal_Typ); | |
6938 | Set_Depends_On_Private | |
6939 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
6940 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
6941 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 6942 | |
1a36a0cd AC |
6943 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
6944 | -- the designated type comes from the limited view (for back-end | |
6945 | -- purposes). | |
ec4867fa | 6946 | |
7b56a91b AC |
6947 | Set_From_Limited_With |
6948 | (Formal_Typ, From_Limited_With (Result_Subt)); | |
f937473f | 6949 | |
1a36a0cd AC |
6950 | Layout_Type (Formal_Typ); |
6951 | ||
6952 | Discard := | |
6953 | Add_Extra_Formal | |
6954 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
6955 | end; |
6956 | end if; | |
996ae0b0 RK |
6957 | end Create_Extra_Formals; |
6958 | ||
6959 | ----------------------------- | |
6960 | -- Enter_Overloaded_Entity -- | |
6961 | ----------------------------- | |
6962 | ||
6963 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
6964 | E : Entity_Id := Current_Entity_In_Scope (S); | |
6965 | C_E : Entity_Id := Current_Entity (S); | |
6966 | ||
6967 | begin | |
6968 | if Present (E) then | |
6969 | Set_Has_Homonym (E); | |
6970 | Set_Has_Homonym (S); | |
6971 | end if; | |
6972 | ||
6973 | Set_Is_Immediately_Visible (S); | |
6974 | Set_Scope (S, Current_Scope); | |
6975 | ||
6976 | -- Chain new entity if front of homonym in current scope, so that | |
6977 | -- homonyms are contiguous. | |
6978 | ||
8fde064e | 6979 | if Present (E) and then E /= C_E then |
996ae0b0 RK |
6980 | while Homonym (C_E) /= E loop |
6981 | C_E := Homonym (C_E); | |
6982 | end loop; | |
6983 | ||
6984 | Set_Homonym (C_E, S); | |
6985 | ||
6986 | else | |
6987 | E := C_E; | |
6988 | Set_Current_Entity (S); | |
6989 | end if; | |
6990 | ||
6991 | Set_Homonym (S, E); | |
6992 | ||
2352eadb AC |
6993 | if Is_Inherited_Operation (S) then |
6994 | Append_Inherited_Subprogram (S); | |
6995 | else | |
6996 | Append_Entity (S, Current_Scope); | |
6997 | end if; | |
6998 | ||
996ae0b0 RK |
6999 | Set_Public_Status (S); |
7000 | ||
7001 | if Debug_Flag_E then | |
7002 | Write_Str ("New overloaded entity chain: "); | |
7003 | Write_Name (Chars (S)); | |
996ae0b0 | 7004 | |
82c80734 | 7005 | E := S; |
996ae0b0 RK |
7006 | while Present (E) loop |
7007 | Write_Str (" "); Write_Int (Int (E)); | |
7008 | E := Homonym (E); | |
7009 | end loop; | |
7010 | ||
7011 | Write_Eol; | |
7012 | end if; | |
7013 | ||
7014 | -- Generate warning for hiding | |
7015 | ||
7016 | if Warn_On_Hiding | |
7017 | and then Comes_From_Source (S) | |
7018 | and then In_Extended_Main_Source_Unit (S) | |
7019 | then | |
7020 | E := S; | |
7021 | loop | |
7022 | E := Homonym (E); | |
7023 | exit when No (E); | |
7024 | ||
7fc53871 AC |
7025 | -- Warn unless genuine overloading. Do not emit warning on |
7026 | -- hiding predefined operators in Standard (these are either an | |
7027 | -- (artifact of our implicit declarations, or simple noise) but | |
7028 | -- keep warning on a operator defined on a local subtype, because | |
7029 | -- of the real danger that different operators may be applied in | |
7030 | -- various parts of the program. | |
996ae0b0 | 7031 | |
1f250383 AC |
7032 | -- Note that if E and S have the same scope, there is never any |
7033 | -- hiding. Either the two conflict, and the program is illegal, | |
7034 | -- or S is overriding an implicit inherited subprogram. | |
7035 | ||
7036 | if Scope (E) /= Scope (S) | |
7037 | and then (not Is_Overloadable (E) | |
8d606a78 | 7038 | or else Subtype_Conformant (E, S)) |
f937473f RD |
7039 | and then (Is_Immediately_Visible (E) |
7040 | or else | |
7041 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 7042 | then |
7fc53871 AC |
7043 | if Scope (E) /= Standard_Standard then |
7044 | Error_Msg_Sloc := Sloc (E); | |
dbfeb4fa | 7045 | Error_Msg_N ("declaration of & hides one#?h?", S); |
7fc53871 AC |
7046 | |
7047 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
7048 | and then | |
1f250383 | 7049 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
7050 | then |
7051 | Error_Msg_N | |
dbfeb4fa | 7052 | ("declaration of & hides predefined operator?h?", S); |
7fc53871 | 7053 | end if; |
996ae0b0 RK |
7054 | end if; |
7055 | end loop; | |
7056 | end if; | |
7057 | end Enter_Overloaded_Entity; | |
7058 | ||
e5a58fac AC |
7059 | ----------------------------- |
7060 | -- Check_Untagged_Equality -- | |
7061 | ----------------------------- | |
7062 | ||
7063 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
7064 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
7065 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
7066 | Obj_Decl : Node_Id; | |
7067 | ||
7068 | begin | |
7c0c194b AC |
7069 | -- This check applies only if we have a subprogram declaration with an |
7070 | -- untagged record type. | |
b2834fbd AC |
7071 | |
7072 | if Nkind (Decl) /= N_Subprogram_Declaration | |
7073 | or else not Is_Record_Type (Typ) | |
7074 | or else Is_Tagged_Type (Typ) | |
e5a58fac | 7075 | then |
b2834fbd AC |
7076 | return; |
7077 | end if; | |
e5a58fac | 7078 | |
b2834fbd AC |
7079 | -- In Ada 2012 case, we will output errors or warnings depending on |
7080 | -- the setting of debug flag -gnatd.E. | |
7081 | ||
7082 | if Ada_Version >= Ada_2012 then | |
7083 | Error_Msg_Warn := Debug_Flag_Dot_EE; | |
7084 | ||
7085 | -- In earlier versions of Ada, nothing to do unless we are warning on | |
7086 | -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). | |
7087 | ||
7088 | else | |
7089 | if not Warn_On_Ada_2012_Compatibility then | |
7090 | return; | |
7091 | end if; | |
7092 | end if; | |
7093 | ||
7094 | -- Cases where the type has already been frozen | |
e5a58fac | 7095 | |
b2834fbd AC |
7096 | if Is_Frozen (Typ) then |
7097 | ||
7098 | -- If the type is not declared in a package, or if we are in the body | |
7099 | -- of the package or in some other scope, the new operation is not | |
7100 | -- primitive, and therefore legal, though suspicious. Should we | |
7101 | -- generate a warning in this case ??? | |
7102 | ||
7103 | if Ekind (Scope (Typ)) /= E_Package | |
7104 | or else Scope (Typ) /= Current_Scope | |
7105 | then | |
7106 | return; | |
7107 | ||
7108 | -- If the type is a generic actual (sub)type, the operation is not | |
7109 | -- primitive either because the base type is declared elsewhere. | |
7110 | ||
7111 | elsif Is_Generic_Actual_Type (Typ) then | |
7112 | return; | |
7113 | ||
7114 | -- Here we have a definite error of declaration after freezing | |
7115 | ||
7116 | else | |
7117 | if Ada_Version >= Ada_2012 then | |
ae6ede77 | 7118 | Error_Msg_NE |
b2834fbd AC |
7119 | ("equality operator must be declared before type& is " |
7120 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); | |
7121 | ||
7122 | -- In Ada 2012 mode with error turned to warning, output one | |
7123 | -- more warning to warn that the equality operation may not | |
7124 | -- compose. This is the consequence of ignoring the error. | |
7125 | ||
7126 | if Error_Msg_Warn then | |
7127 | Error_Msg_N ("\equality operation may not compose??", Eq_Op); | |
7128 | end if; | |
21a5b575 AC |
7129 | |
7130 | else | |
7131 | Error_Msg_NE | |
b2834fbd AC |
7132 | ("equality operator must be declared before type& is " |
7133 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); | |
7134 | end if; | |
7135 | ||
7136 | -- If we are in the package body, we could just move the | |
7137 | -- declaration to the package spec, so add a message saying that. | |
7138 | ||
7139 | if In_Package_Body (Scope (Typ)) then | |
7140 | if Ada_Version >= Ada_2012 then | |
7141 | Error_Msg_N | |
7142 | ("\move declaration to package spec<<", Eq_Op); | |
7143 | else | |
7144 | Error_Msg_N | |
7145 | ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); | |
7146 | end if; | |
21a5b575 | 7147 | |
b2834fbd AC |
7148 | -- Otherwise try to find the freezing point |
7149 | ||
7150 | else | |
21a5b575 | 7151 | Obj_Decl := Next (Parent (Typ)); |
dbfeb4fa | 7152 | while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
21a5b575 AC |
7153 | if Nkind (Obj_Decl) = N_Object_Declaration |
7154 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
7155 | then | |
b2834fbd AC |
7156 | -- Freezing point, output warnings |
7157 | ||
7158 | if Ada_Version >= Ada_2012 then | |
7159 | Error_Msg_NE | |
7160 | ("type& is frozen by declaration??", Obj_Decl, Typ); | |
7161 | Error_Msg_N | |
7162 | ("\an equality operator cannot be declared after " | |
7163 | & "this point??", | |
7164 | Obj_Decl); | |
7165 | else | |
7166 | Error_Msg_NE | |
7167 | ("type& is frozen by declaration (Ada 2012)?y?", | |
7168 | Obj_Decl, Typ); | |
7169 | Error_Msg_N | |
7170 | ("\an equality operator cannot be declared after " | |
7171 | & "this point (Ada 2012)?y?", | |
7172 | Obj_Decl); | |
7173 | end if; | |
7174 | ||
21a5b575 AC |
7175 | exit; |
7176 | end if; | |
7177 | ||
7178 | Next (Obj_Decl); | |
7179 | end loop; | |
7180 | end if; | |
b2834fbd | 7181 | end if; |
e5a58fac | 7182 | |
b2834fbd AC |
7183 | -- Here if type is not frozen yet. It is illegal to have a primitive |
7184 | -- equality declared in the private part if the type is visible. | |
21a5b575 | 7185 | |
b2834fbd AC |
7186 | elsif not In_Same_List (Parent (Typ), Decl) |
7187 | and then not Is_Limited_Type (Typ) | |
7188 | then | |
7189 | -- Shouldn't we give an RM reference here??? | |
21a5b575 | 7190 | |
b2834fbd AC |
7191 | if Ada_Version >= Ada_2012 then |
7192 | Error_Msg_N | |
7193 | ("equality operator appears too late<<", Eq_Op); | |
7194 | else | |
7195 | Error_Msg_N | |
7196 | ("equality operator appears too late (Ada 2012)?y?", Eq_Op); | |
e5a58fac | 7197 | end if; |
b2834fbd AC |
7198 | |
7199 | -- No error detected | |
7200 | ||
7201 | else | |
7202 | return; | |
e5a58fac AC |
7203 | end if; |
7204 | end Check_Untagged_Equality; | |
7205 | ||
996ae0b0 RK |
7206 | ----------------------------- |
7207 | -- Find_Corresponding_Spec -- | |
7208 | ----------------------------- | |
7209 | ||
d44202ba HK |
7210 | function Find_Corresponding_Spec |
7211 | (N : Node_Id; | |
7212 | Post_Error : Boolean := True) return Entity_Id | |
7213 | is | |
996ae0b0 RK |
7214 | Spec : constant Node_Id := Specification (N); |
7215 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
7216 | ||
7217 | E : Entity_Id; | |
7218 | ||
70f4ad20 AC |
7219 | function Different_Generic_Profile (E : Entity_Id) return Boolean; |
7220 | -- Even if fully conformant, a body may depend on a generic actual when | |
7221 | -- the spec does not, or vice versa, in which case they were distinct | |
7222 | -- entities in the generic. | |
7223 | ||
7224 | ------------------------------- | |
7225 | -- Different_Generic_Profile -- | |
7226 | ------------------------------- | |
7227 | ||
7228 | function Different_Generic_Profile (E : Entity_Id) return Boolean is | |
7229 | F1, F2 : Entity_Id; | |
7230 | ||
2995860f AC |
7231 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
7232 | -- Check that the types of corresponding formals have the same | |
7233 | -- generic actual if any. We have to account for subtypes of a | |
7234 | -- generic formal, declared between a spec and a body, which may | |
7235 | -- appear distinct in an instance but matched in the generic. | |
7236 | ||
7237 | ------------------------- | |
7238 | -- Same_Generic_Actual -- | |
7239 | ------------------------- | |
7240 | ||
7241 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is | |
7242 | begin | |
7243 | return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) | |
7244 | or else | |
7245 | (Present (Parent (T1)) | |
7246 | and then Comes_From_Source (Parent (T1)) | |
7247 | and then Nkind (Parent (T1)) = N_Subtype_Declaration | |
7248 | and then Is_Entity_Name (Subtype_Indication (Parent (T1))) | |
7249 | and then Entity (Subtype_Indication (Parent (T1))) = T2); | |
7250 | end Same_Generic_Actual; | |
7251 | ||
7252 | -- Start of processing for Different_Generic_Profile | |
7253 | ||
70f4ad20 | 7254 | begin |
2995860f AC |
7255 | if not In_Instance then |
7256 | return False; | |
7257 | ||
7258 | elsif Ekind (E) = E_Function | |
7259 | and then not Same_Generic_Actual (Etype (E), Etype (Designator)) | |
70f4ad20 AC |
7260 | then |
7261 | return True; | |
7262 | end if; | |
7263 | ||
7264 | F1 := First_Formal (Designator); | |
7265 | F2 := First_Formal (E); | |
70f4ad20 | 7266 | while Present (F1) loop |
2995860f | 7267 | if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
70f4ad20 AC |
7268 | return True; |
7269 | end if; | |
7270 | ||
7271 | Next_Formal (F1); | |
7272 | Next_Formal (F2); | |
7273 | end loop; | |
7274 | ||
7275 | return False; | |
7276 | end Different_Generic_Profile; | |
7277 | ||
7278 | -- Start of processing for Find_Corresponding_Spec | |
7279 | ||
996ae0b0 RK |
7280 | begin |
7281 | E := Current_Entity (Designator); | |
996ae0b0 RK |
7282 | while Present (E) loop |
7283 | ||
7284 | -- We are looking for a matching spec. It must have the same scope, | |
7285 | -- and the same name, and either be type conformant, or be the case | |
7286 | -- of a library procedure spec and its body (which belong to one | |
7287 | -- another regardless of whether they are type conformant or not). | |
7288 | ||
7289 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
7290 | if Current_Scope = Standard_Standard |
7291 | or else (Ekind (E) = Ekind (Designator) | |
586ecbf3 | 7292 | and then Type_Conformant (E, Designator)) |
996ae0b0 RK |
7293 | then |
7294 | -- Within an instantiation, we know that spec and body are | |
70f4ad20 AC |
7295 | -- subtype conformant, because they were subtype conformant in |
7296 | -- the generic. We choose the subtype-conformant entity here as | |
7297 | -- well, to resolve spurious ambiguities in the instance that | |
7298 | -- were not present in the generic (i.e. when two different | |
7299 | -- types are given the same actual). If we are looking for a | |
7300 | -- spec to match a body, full conformance is expected. | |
996ae0b0 RK |
7301 | |
7302 | if In_Instance then | |
7303 | Set_Convention (Designator, Convention (E)); | |
7304 | ||
0187b60e AC |
7305 | -- Skip past subprogram bodies and subprogram renamings that |
7306 | -- may appear to have a matching spec, but that aren't fully | |
7307 | -- conformant with it. That can occur in cases where an | |
7308 | -- actual type causes unrelated homographs in the instance. | |
7309 | ||
7310 | if Nkind_In (N, N_Subprogram_Body, | |
7311 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 7312 | and then Present (Homonym (E)) |
c7b9d548 | 7313 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
7314 | then |
7315 | goto Next_Entity; | |
7316 | ||
c7b9d548 | 7317 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 | 7318 | goto Next_Entity; |
70f4ad20 AC |
7319 | |
7320 | elsif Different_Generic_Profile (E) then | |
7321 | goto Next_Entity; | |
996ae0b0 RK |
7322 | end if; |
7323 | end if; | |
7324 | ||
25ebc085 AC |
7325 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
7326 | -- null procedures locate the internally generated spec. We | |
7327 | -- enforce mode conformance since a tagged type may inherit | |
7328 | -- from interfaces several null primitives which differ only | |
7329 | -- in the mode of the formals. | |
7330 | ||
7331 | if not (Comes_From_Source (E)) | |
7332 | and then Is_Null_Procedure (E) | |
7333 | and then not Mode_Conformant (Designator, E) | |
7334 | then | |
7335 | null; | |
7336 | ||
4d8f3296 ES |
7337 | -- For null procedures coming from source that are completions, |
7338 | -- analysis of the generated body will establish the link. | |
7339 | ||
7340 | elsif Comes_From_Source (E) | |
7341 | and then Nkind (Spec) = N_Procedure_Specification | |
7342 | and then Null_Present (Spec) | |
7343 | then | |
7344 | return E; | |
7345 | ||
25ebc085 | 7346 | elsif not Has_Completion (E) then |
996ae0b0 RK |
7347 | if Nkind (N) /= N_Subprogram_Body_Stub then |
7348 | Set_Corresponding_Spec (N, E); | |
7349 | end if; | |
7350 | ||
7351 | Set_Has_Completion (E); | |
7352 | return E; | |
7353 | ||
7354 | elsif Nkind (Parent (N)) = N_Subunit then | |
7355 | ||
7356 | -- If this is the proper body of a subunit, the completion | |
7357 | -- flag is set when analyzing the stub. | |
7358 | ||
7359 | return E; | |
7360 | ||
70f4ad20 AC |
7361 | -- If E is an internal function with a controlling result that |
7362 | -- was created for an operation inherited by a null extension, | |
7363 | -- it may be overridden by a body without a previous spec (one | |
2995860f | 7364 | -- more reason why these should be shunned). In that case we |
70f4ad20 AC |
7365 | -- remove the generated body if present, because the current |
7366 | -- one is the explicit overriding. | |
81db9d77 ES |
7367 | |
7368 | elsif Ekind (E) = E_Function | |
0791fbe9 | 7369 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
7370 | and then not Comes_From_Source (E) |
7371 | and then Has_Controlling_Result (E) | |
7372 | and then Is_Null_Extension (Etype (E)) | |
7373 | and then Comes_From_Source (Spec) | |
7374 | then | |
7375 | Set_Has_Completion (E, False); | |
7376 | ||
1366997b AC |
7377 | if Expander_Active |
7378 | and then Nkind (Parent (E)) = N_Function_Specification | |
7379 | then | |
81db9d77 ES |
7380 | Remove |
7381 | (Unit_Declaration_Node | |
1366997b AC |
7382 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
7383 | ||
81db9d77 ES |
7384 | return E; |
7385 | ||
1366997b AC |
7386 | -- If expansion is disabled, or if the wrapper function has |
7387 | -- not been generated yet, this a late body overriding an | |
7388 | -- inherited operation, or it is an overriding by some other | |
7389 | -- declaration before the controlling result is frozen. In | |
7390 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
7391 | |
7392 | else | |
7393 | return Empty; | |
7394 | end if; | |
7395 | ||
d44202ba HK |
7396 | -- If the body already exists, then this is an error unless |
7397 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
7398 | -- derived subprogram. It is also legal for an instance to |
7399 | -- contain type conformant overloadable declarations (but the | |
7400 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
7401 | |
7402 | elsif No (Alias (E)) | |
7403 | and then not Is_Intrinsic_Subprogram (E) | |
7404 | and then not In_Instance | |
d44202ba | 7405 | and then Post_Error |
996ae0b0 RK |
7406 | then |
7407 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 7408 | |
07fc65c4 GB |
7409 | if Is_Imported (E) then |
7410 | Error_Msg_NE | |
7411 | ("body not allowed for imported subprogram & declared#", | |
7412 | N, E); | |
7413 | else | |
7414 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
7415 | end if; | |
996ae0b0 RK |
7416 | end if; |
7417 | ||
d44202ba HK |
7418 | -- Child units cannot be overloaded, so a conformance mismatch |
7419 | -- between body and a previous spec is an error. | |
7420 | ||
996ae0b0 RK |
7421 | elsif Is_Child_Unit (E) |
7422 | and then | |
7423 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
7424 | and then | |
5d37ba92 | 7425 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
7426 | N_Compilation_Unit |
7427 | and then Post_Error | |
996ae0b0 | 7428 | then |
996ae0b0 RK |
7429 | Error_Msg_N |
7430 | ("body of child unit does not match previous declaration", N); | |
7431 | end if; | |
7432 | end if; | |
7433 | ||
7434 | <<Next_Entity>> | |
7435 | E := Homonym (E); | |
7436 | end loop; | |
7437 | ||
7438 | -- On exit, we know that no previous declaration of subprogram exists | |
7439 | ||
7440 | return Empty; | |
7441 | end Find_Corresponding_Spec; | |
7442 | ||
7443 | ---------------------- | |
7444 | -- Fully_Conformant -- | |
7445 | ---------------------- | |
7446 | ||
7447 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
7448 | Result : Boolean; | |
996ae0b0 RK |
7449 | begin |
7450 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
7451 | return Result; | |
7452 | end Fully_Conformant; | |
7453 | ||
7454 | ---------------------------------- | |
7455 | -- Fully_Conformant_Expressions -- | |
7456 | ---------------------------------- | |
7457 | ||
7458 | function Fully_Conformant_Expressions | |
7459 | (Given_E1 : Node_Id; | |
d05ef0ab | 7460 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
7461 | is |
7462 | E1 : constant Node_Id := Original_Node (Given_E1); | |
7463 | E2 : constant Node_Id := Original_Node (Given_E2); | |
7464 | -- We always test conformance on original nodes, since it is possible | |
7465 | -- for analysis and/or expansion to make things look as though they | |
7466 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
7467 | ||
7468 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
7469 | renames Fully_Conformant_Expressions; | |
7470 | ||
7471 | function FCL (L1, L2 : List_Id) return Boolean; | |
70f4ad20 AC |
7472 | -- Compare elements of two lists for conformance. Elements have to be |
7473 | -- conformant, and actuals inserted as default parameters do not match | |
7474 | -- explicit actuals with the same value. | |
996ae0b0 RK |
7475 | |
7476 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 7477 | -- Compare an operator node with a function call |
996ae0b0 RK |
7478 | |
7479 | --------- | |
7480 | -- FCL -- | |
7481 | --------- | |
7482 | ||
7483 | function FCL (L1, L2 : List_Id) return Boolean is | |
7484 | N1, N2 : Node_Id; | |
7485 | ||
7486 | begin | |
7487 | if L1 = No_List then | |
7488 | N1 := Empty; | |
7489 | else | |
7490 | N1 := First (L1); | |
7491 | end if; | |
7492 | ||
7493 | if L2 = No_List then | |
7494 | N2 := Empty; | |
7495 | else | |
7496 | N2 := First (L2); | |
7497 | end if; | |
7498 | ||
70f4ad20 | 7499 | -- Compare two lists, skipping rewrite insertions (we want to compare |
a90bd866 | 7500 | -- the original trees, not the expanded versions). |
996ae0b0 RK |
7501 | |
7502 | loop | |
7503 | if Is_Rewrite_Insertion (N1) then | |
7504 | Next (N1); | |
7505 | elsif Is_Rewrite_Insertion (N2) then | |
7506 | Next (N2); | |
7507 | elsif No (N1) then | |
7508 | return No (N2); | |
7509 | elsif No (N2) then | |
7510 | return False; | |
7511 | elsif not FCE (N1, N2) then | |
7512 | return False; | |
7513 | else | |
7514 | Next (N1); | |
7515 | Next (N2); | |
7516 | end if; | |
7517 | end loop; | |
7518 | end FCL; | |
7519 | ||
7520 | --------- | |
7521 | -- FCO -- | |
7522 | --------- | |
7523 | ||
7524 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
7525 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
7526 | Act : Node_Id; | |
7527 | ||
7528 | begin | |
7529 | if No (Actuals) | |
7530 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
7531 | then | |
7532 | return False; | |
7533 | ||
7534 | else | |
7535 | Act := First (Actuals); | |
7536 | ||
7537 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
7538 | if not FCE (Left_Opnd (Op_Node), Act) then |
7539 | return False; | |
7540 | end if; | |
7541 | ||
7542 | Next (Act); | |
7543 | end if; | |
7544 | ||
7545 | return Present (Act) | |
7546 | and then FCE (Right_Opnd (Op_Node), Act) | |
7547 | and then No (Next (Act)); | |
7548 | end if; | |
7549 | end FCO; | |
7550 | ||
7551 | -- Start of processing for Fully_Conformant_Expressions | |
7552 | ||
7553 | begin | |
7554 | -- Non-conformant if paren count does not match. Note: if some idiot | |
7555 | -- complains that we don't do this right for more than 3 levels of | |
a90bd866 | 7556 | -- parentheses, they will be treated with the respect they deserve. |
996ae0b0 RK |
7557 | |
7558 | if Paren_Count (E1) /= Paren_Count (E2) then | |
7559 | return False; | |
7560 | ||
82c80734 RD |
7561 | -- If same entities are referenced, then they are conformant even if |
7562 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
7563 | |
7564 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
7565 | if Present (Entity (E1)) then | |
7566 | return Entity (E1) = Entity (E2) | |
7567 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
7568 | and then Ekind (Entity (E1)) = E_Discriminant | |
7569 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
7570 | ||
7571 | elsif Nkind (E1) = N_Expanded_Name | |
7572 | and then Nkind (E2) = N_Expanded_Name | |
7573 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
7574 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
7575 | then | |
7576 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
7577 | ||
7578 | else | |
7579 | -- Identifiers in component associations don't always have | |
7580 | -- entities, but their names must conform. | |
7581 | ||
7582 | return Nkind (E1) = N_Identifier | |
7583 | and then Nkind (E2) = N_Identifier | |
7584 | and then Chars (E1) = Chars (E2); | |
7585 | end if; | |
7586 | ||
7587 | elsif Nkind (E1) = N_Character_Literal | |
7588 | and then Nkind (E2) = N_Expanded_Name | |
7589 | then | |
7590 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
7591 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
7592 | ||
7593 | elsif Nkind (E2) = N_Character_Literal | |
7594 | and then Nkind (E1) = N_Expanded_Name | |
7595 | then | |
7596 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
7597 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
7598 | ||
8fde064e | 7599 | elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
996ae0b0 RK |
7600 | return FCO (E1, E2); |
7601 | ||
8fde064e | 7602 | elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
996ae0b0 RK |
7603 | return FCO (E2, E1); |
7604 | ||
7605 | -- Otherwise we must have the same syntactic entity | |
7606 | ||
7607 | elsif Nkind (E1) /= Nkind (E2) then | |
7608 | return False; | |
7609 | ||
7610 | -- At this point, we specialize by node type | |
7611 | ||
7612 | else | |
7613 | case Nkind (E1) is | |
7614 | ||
7615 | when N_Aggregate => | |
7616 | return | |
7617 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
7618 | and then |
7619 | FCL (Component_Associations (E1), | |
7620 | Component_Associations (E2)); | |
996ae0b0 RK |
7621 | |
7622 | when N_Allocator => | |
7623 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
7624 | or else | |
7625 | Nkind (Expression (E2)) = N_Qualified_Expression | |
7626 | then | |
7627 | return FCE (Expression (E1), Expression (E2)); | |
7628 | ||
7629 | -- Check that the subtype marks and any constraints | |
7630 | -- are conformant | |
7631 | ||
7632 | else | |
7633 | declare | |
7634 | Indic1 : constant Node_Id := Expression (E1); | |
7635 | Indic2 : constant Node_Id := Expression (E2); | |
7636 | Elt1 : Node_Id; | |
7637 | Elt2 : Node_Id; | |
7638 | ||
7639 | begin | |
7640 | if Nkind (Indic1) /= N_Subtype_Indication then | |
7641 | return | |
7642 | Nkind (Indic2) /= N_Subtype_Indication | |
7643 | and then Entity (Indic1) = Entity (Indic2); | |
7644 | ||
7645 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
7646 | return | |
7647 | Nkind (Indic1) /= N_Subtype_Indication | |
7648 | and then Entity (Indic1) = Entity (Indic2); | |
7649 | ||
7650 | else | |
7651 | if Entity (Subtype_Mark (Indic1)) /= | |
7652 | Entity (Subtype_Mark (Indic2)) | |
7653 | then | |
7654 | return False; | |
7655 | end if; | |
7656 | ||
7657 | Elt1 := First (Constraints (Constraint (Indic1))); | |
7658 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
7659 | while Present (Elt1) and then Present (Elt2) loop |
7660 | if not FCE (Elt1, Elt2) then | |
7661 | return False; | |
7662 | end if; | |
7663 | ||
7664 | Next (Elt1); | |
7665 | Next (Elt2); | |
7666 | end loop; | |
7667 | ||
7668 | return True; | |
7669 | end if; | |
7670 | end; | |
7671 | end if; | |
7672 | ||
7673 | when N_Attribute_Reference => | |
7674 | return | |
7675 | Attribute_Name (E1) = Attribute_Name (E2) | |
7676 | and then FCL (Expressions (E1), Expressions (E2)); | |
7677 | ||
7678 | when N_Binary_Op => | |
7679 | return | |
7680 | Entity (E1) = Entity (E2) | |
7681 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7682 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7683 | ||
514d0fc5 | 7684 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
7685 | return |
7686 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7687 | and then | |
7688 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7689 | ||
19d846a0 RD |
7690 | when N_Case_Expression => |
7691 | declare | |
7692 | Alt1 : Node_Id; | |
7693 | Alt2 : Node_Id; | |
7694 | ||
7695 | begin | |
7696 | if not FCE (Expression (E1), Expression (E2)) then | |
7697 | return False; | |
7698 | ||
7699 | else | |
7700 | Alt1 := First (Alternatives (E1)); | |
7701 | Alt2 := First (Alternatives (E2)); | |
7702 | loop | |
7703 | if Present (Alt1) /= Present (Alt2) then | |
7704 | return False; | |
7705 | elsif No (Alt1) then | |
7706 | return True; | |
7707 | end if; | |
7708 | ||
7709 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
7710 | or else not FCL (Discrete_Choices (Alt1), | |
7711 | Discrete_Choices (Alt2)) | |
7712 | then | |
7713 | return False; | |
7714 | end if; | |
7715 | ||
7716 | Next (Alt1); | |
7717 | Next (Alt2); | |
7718 | end loop; | |
7719 | end if; | |
7720 | end; | |
7721 | ||
996ae0b0 RK |
7722 | when N_Character_Literal => |
7723 | return | |
7724 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
7725 | ||
7726 | when N_Component_Association => | |
7727 | return | |
7728 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
7729 | and then |
7730 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 7731 | |
996ae0b0 RK |
7732 | when N_Explicit_Dereference => |
7733 | return | |
7734 | FCE (Prefix (E1), Prefix (E2)); | |
7735 | ||
7736 | when N_Extension_Aggregate => | |
7737 | return | |
7738 | FCL (Expressions (E1), Expressions (E2)) | |
7739 | and then Null_Record_Present (E1) = | |
7740 | Null_Record_Present (E2) | |
7741 | and then FCL (Component_Associations (E1), | |
7742 | Component_Associations (E2)); | |
7743 | ||
7744 | when N_Function_Call => | |
7745 | return | |
7746 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
7747 | and then |
7748 | FCL (Parameter_Associations (E1), | |
7749 | Parameter_Associations (E2)); | |
996ae0b0 | 7750 | |
9b16cb57 RD |
7751 | when N_If_Expression => |
7752 | return | |
7753 | FCL (Expressions (E1), Expressions (E2)); | |
7754 | ||
996ae0b0 RK |
7755 | when N_Indexed_Component => |
7756 | return | |
7757 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7758 | and then |
7759 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
7760 | |
7761 | when N_Integer_Literal => | |
7762 | return (Intval (E1) = Intval (E2)); | |
7763 | ||
7764 | when N_Null => | |
7765 | return True; | |
7766 | ||
7767 | when N_Operator_Symbol => | |
7768 | return | |
7769 | Chars (E1) = Chars (E2); | |
7770 | ||
7771 | when N_Others_Choice => | |
7772 | return True; | |
7773 | ||
7774 | when N_Parameter_Association => | |
7775 | return | |
996ae0b0 RK |
7776 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
7777 | and then FCE (Explicit_Actual_Parameter (E1), | |
7778 | Explicit_Actual_Parameter (E2)); | |
7779 | ||
7780 | when N_Qualified_Expression => | |
7781 | return | |
7782 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7783 | and then |
7784 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 7785 | |
2010d078 AC |
7786 | when N_Quantified_Expression => |
7787 | if not FCE (Condition (E1), Condition (E2)) then | |
7788 | return False; | |
7789 | end if; | |
7790 | ||
7791 | if Present (Loop_Parameter_Specification (E1)) | |
7792 | and then Present (Loop_Parameter_Specification (E2)) | |
7793 | then | |
7794 | declare | |
7795 | L1 : constant Node_Id := | |
7796 | Loop_Parameter_Specification (E1); | |
7797 | L2 : constant Node_Id := | |
7798 | Loop_Parameter_Specification (E2); | |
7799 | ||
7800 | begin | |
7801 | return | |
7802 | Reverse_Present (L1) = Reverse_Present (L2) | |
7803 | and then | |
7804 | FCE (Defining_Identifier (L1), | |
7805 | Defining_Identifier (L2)) | |
7806 | and then | |
7807 | FCE (Discrete_Subtype_Definition (L1), | |
7808 | Discrete_Subtype_Definition (L2)); | |
7809 | end; | |
7810 | ||
804670f1 AC |
7811 | elsif Present (Iterator_Specification (E1)) |
7812 | and then Present (Iterator_Specification (E2)) | |
7813 | then | |
2010d078 AC |
7814 | declare |
7815 | I1 : constant Node_Id := Iterator_Specification (E1); | |
7816 | I2 : constant Node_Id := Iterator_Specification (E2); | |
7817 | ||
7818 | begin | |
7819 | return | |
7820 | FCE (Defining_Identifier (I1), | |
7821 | Defining_Identifier (I2)) | |
7822 | and then | |
7823 | Of_Present (I1) = Of_Present (I2) | |
7824 | and then | |
7825 | Reverse_Present (I1) = Reverse_Present (I2) | |
7826 | and then FCE (Name (I1), Name (I2)) | |
7827 | and then FCE (Subtype_Indication (I1), | |
7828 | Subtype_Indication (I2)); | |
7829 | end; | |
804670f1 AC |
7830 | |
7831 | -- The quantified expressions used different specifications to | |
7832 | -- walk their respective ranges. | |
7833 | ||
7834 | else | |
7835 | return False; | |
2010d078 AC |
7836 | end if; |
7837 | ||
996ae0b0 RK |
7838 | when N_Range => |
7839 | return | |
7840 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
7841 | and then |
7842 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
7843 | |
7844 | when N_Real_Literal => | |
7845 | return (Realval (E1) = Realval (E2)); | |
7846 | ||
7847 | when N_Selected_Component => | |
7848 | return | |
7849 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7850 | and then |
7851 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
7852 | |
7853 | when N_Slice => | |
7854 | return | |
7855 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7856 | and then |
7857 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
7858 | |
7859 | when N_String_Literal => | |
7860 | declare | |
7861 | S1 : constant String_Id := Strval (E1); | |
7862 | S2 : constant String_Id := Strval (E2); | |
7863 | L1 : constant Nat := String_Length (S1); | |
7864 | L2 : constant Nat := String_Length (S2); | |
7865 | ||
7866 | begin | |
7867 | if L1 /= L2 then | |
7868 | return False; | |
7869 | ||
7870 | else | |
7871 | for J in 1 .. L1 loop | |
7872 | if Get_String_Char (S1, J) /= | |
7873 | Get_String_Char (S2, J) | |
7874 | then | |
7875 | return False; | |
7876 | end if; | |
7877 | end loop; | |
7878 | ||
7879 | return True; | |
7880 | end if; | |
7881 | end; | |
7882 | ||
7883 | when N_Type_Conversion => | |
7884 | return | |
7885 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7886 | and then |
7887 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7888 | |
7889 | when N_Unary_Op => | |
7890 | return | |
7891 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
7892 | and then |
7893 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
7894 | |
7895 | when N_Unchecked_Type_Conversion => | |
7896 | return | |
7897 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7898 | and then |
7899 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7900 | |
7901 | -- All other node types cannot appear in this context. Strictly | |
7902 | -- we should raise a fatal internal error. Instead we just ignore | |
7903 | -- the nodes. This means that if anyone makes a mistake in the | |
2995860f AC |
7904 | -- expander and mucks an expression tree irretrievably, the result |
7905 | -- will be a failure to detect a (probably very obscure) case | |
7906 | -- of non-conformance, which is better than bombing on some | |
996ae0b0 RK |
7907 | -- case where two expressions do in fact conform. |
7908 | ||
7909 | when others => | |
7910 | return True; | |
7911 | ||
7912 | end case; | |
7913 | end if; | |
7914 | end Fully_Conformant_Expressions; | |
7915 | ||
fbf5a39b AC |
7916 | ---------------------------------------- |
7917 | -- Fully_Conformant_Discrete_Subtypes -- | |
7918 | ---------------------------------------- | |
7919 | ||
7920 | function Fully_Conformant_Discrete_Subtypes | |
7921 | (Given_S1 : Node_Id; | |
d05ef0ab | 7922 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
7923 | is |
7924 | S1 : constant Node_Id := Original_Node (Given_S1); | |
7925 | S2 : constant Node_Id := Original_Node (Given_S2); | |
7926 | ||
7927 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
7928 | -- Special-case for a bound given by a discriminant, which in the body |
7929 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
7930 | |
7931 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 7932 | -- Check both bounds |
fbf5a39b | 7933 | |
5d37ba92 ES |
7934 | ----------------------- |
7935 | -- Conforming_Bounds -- | |
7936 | ----------------------- | |
7937 | ||
fbf5a39b AC |
7938 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
7939 | begin | |
7940 | if Is_Entity_Name (B1) | |
7941 | and then Is_Entity_Name (B2) | |
7942 | and then Ekind (Entity (B1)) = E_Discriminant | |
7943 | then | |
7944 | return Chars (B1) = Chars (B2); | |
7945 | ||
7946 | else | |
7947 | return Fully_Conformant_Expressions (B1, B2); | |
7948 | end if; | |
7949 | end Conforming_Bounds; | |
7950 | ||
5d37ba92 ES |
7951 | ----------------------- |
7952 | -- Conforming_Ranges -- | |
7953 | ----------------------- | |
7954 | ||
fbf5a39b AC |
7955 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
7956 | begin | |
7957 | return | |
7958 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
7959 | and then | |
7960 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
7961 | end Conforming_Ranges; | |
7962 | ||
7963 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
7964 | ||
7965 | begin | |
7966 | if Nkind (S1) /= Nkind (S2) then | |
7967 | return False; | |
7968 | ||
7969 | elsif Is_Entity_Name (S1) then | |
7970 | return Entity (S1) = Entity (S2); | |
7971 | ||
7972 | elsif Nkind (S1) = N_Range then | |
7973 | return Conforming_Ranges (S1, S2); | |
7974 | ||
7975 | elsif Nkind (S1) = N_Subtype_Indication then | |
7976 | return | |
7977 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
7978 | and then | |
7979 | Conforming_Ranges | |
7980 | (Range_Expression (Constraint (S1)), | |
7981 | Range_Expression (Constraint (S2))); | |
7982 | else | |
7983 | return True; | |
7984 | end if; | |
7985 | end Fully_Conformant_Discrete_Subtypes; | |
7986 | ||
996ae0b0 RK |
7987 | -------------------- |
7988 | -- Install_Entity -- | |
7989 | -------------------- | |
7990 | ||
7991 | procedure Install_Entity (E : Entity_Id) is | |
7992 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
7993 | begin |
7994 | Set_Is_Immediately_Visible (E); | |
7995 | Set_Current_Entity (E); | |
7996 | Set_Homonym (E, Prev); | |
7997 | end Install_Entity; | |
7998 | ||
7999 | --------------------- | |
8000 | -- Install_Formals -- | |
8001 | --------------------- | |
8002 | ||
8003 | procedure Install_Formals (Id : Entity_Id) is | |
8004 | F : Entity_Id; | |
996ae0b0 RK |
8005 | begin |
8006 | F := First_Formal (Id); | |
996ae0b0 RK |
8007 | while Present (F) loop |
8008 | Install_Entity (F); | |
8009 | Next_Formal (F); | |
8010 | end loop; | |
8011 | end Install_Formals; | |
8012 | ||
ce2b6ba5 JM |
8013 | ----------------------------- |
8014 | -- Is_Interface_Conformant -- | |
8015 | ----------------------------- | |
8016 | ||
8017 | function Is_Interface_Conformant | |
8018 | (Tagged_Type : Entity_Id; | |
8019 | Iface_Prim : Entity_Id; | |
8020 | Prim : Entity_Id) return Boolean | |
8021 | is | |
9e92ad49 AC |
8022 | -- The operation may in fact be an inherited (implicit) operation |
8023 | -- rather than the original interface primitive, so retrieve the | |
8024 | -- ultimate ancestor. | |
8025 | ||
8026 | Iface : constant Entity_Id := | |
8027 | Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); | |
fceeaab6 ES |
8028 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
8029 | ||
25ebc085 AC |
8030 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
8031 | -- Return the controlling formal of Prim | |
8032 | ||
59e6b23c AC |
8033 | ------------------------ |
8034 | -- Controlling_Formal -- | |
8035 | ------------------------ | |
8036 | ||
25ebc085 | 8037 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
15918371 | 8038 | E : Entity_Id; |
59e6b23c | 8039 | |
25ebc085 | 8040 | begin |
15918371 | 8041 | E := First_Entity (Prim); |
25ebc085 AC |
8042 | while Present (E) loop |
8043 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
8044 | return E; | |
8045 | end if; | |
8046 | ||
8047 | Next_Entity (E); | |
8048 | end loop; | |
8049 | ||
8050 | return Empty; | |
8051 | end Controlling_Formal; | |
8052 | ||
8053 | -- Local variables | |
8054 | ||
8055 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
8056 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
8057 | ||
8058 | -- Start of processing for Is_Interface_Conformant | |
8059 | ||
ce2b6ba5 JM |
8060 | begin |
8061 | pragma Assert (Is_Subprogram (Iface_Prim) | |
8062 | and then Is_Subprogram (Prim) | |
8063 | and then Is_Dispatching_Operation (Iface_Prim) | |
8064 | and then Is_Dispatching_Operation (Prim)); | |
8065 | ||
fceeaab6 | 8066 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
8067 | or else (Present (Alias (Iface_Prim)) |
8068 | and then | |
8069 | Is_Interface | |
8070 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
8071 | ||
8072 | if Prim = Iface_Prim | |
8073 | or else not Is_Subprogram (Prim) | |
8074 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
8075 | or else not Is_Dispatching_Operation (Prim) | |
8076 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 | 8077 | or else No (Typ) |
8a49a499 | 8078 | or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
ce2b6ba5 JM |
8079 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
8080 | then | |
8081 | return False; | |
8082 | ||
25ebc085 AC |
8083 | -- The mode of the controlling formals must match |
8084 | ||
8085 | elsif Present (Iface_Ctrl_F) | |
15918371 AC |
8086 | and then Present (Prim_Ctrl_F) |
8087 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
25ebc085 AC |
8088 | then |
8089 | return False; | |
8090 | ||
8091 | -- Case of a procedure, or a function whose result type matches the | |
8092 | -- result type of the interface primitive, or a function that has no | |
8093 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
8094 | |
8095 | elsif Ekind (Iface_Prim) = E_Procedure | |
8096 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 8097 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 8098 | then |
b4d7b435 AC |
8099 | return Type_Conformant |
8100 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 8101 | |
2995860f AC |
8102 | -- Case of a function returning an interface, or an access to one. Check |
8103 | -- that the return types correspond. | |
ce2b6ba5 | 8104 | |
fceeaab6 ES |
8105 | elsif Implements_Interface (Typ, Iface) then |
8106 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
8107 | /= |
8108 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
8109 | then |
8110 | return False; | |
fceeaab6 ES |
8111 | else |
8112 | return | |
9e92ad49 | 8113 | Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
ce2b6ba5 | 8114 | Skip_Controlling_Formals => True); |
fceeaab6 | 8115 | end if; |
ce2b6ba5 | 8116 | |
fceeaab6 ES |
8117 | else |
8118 | return False; | |
ce2b6ba5 | 8119 | end if; |
ce2b6ba5 JM |
8120 | end Is_Interface_Conformant; |
8121 | ||
996ae0b0 RK |
8122 | --------------------------------- |
8123 | -- Is_Non_Overriding_Operation -- | |
8124 | --------------------------------- | |
8125 | ||
8126 | function Is_Non_Overriding_Operation | |
8127 | (Prev_E : Entity_Id; | |
d05ef0ab | 8128 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
8129 | is |
8130 | Formal : Entity_Id; | |
8131 | F_Typ : Entity_Id; | |
8132 | G_Typ : Entity_Id := Empty; | |
8133 | ||
8134 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
8135 | -- If F_Type is a derived type associated with a generic actual subtype, |
8136 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
8137 | |
8138 | function Types_Correspond | |
8139 | (P_Type : Entity_Id; | |
d05ef0ab | 8140 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
8141 | -- Returns true if and only if the types (or designated types in the |
8142 | -- case of anonymous access types) are the same or N_Type is derived | |
8143 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
8144 | |
8145 | ----------------------------- | |
8146 | -- Get_Generic_Parent_Type -- | |
8147 | ----------------------------- | |
8148 | ||
8149 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
8150 | G_Typ : Entity_Id; | |
702d2020 | 8151 | Defn : Node_Id; |
996ae0b0 RK |
8152 | Indic : Node_Id; |
8153 | ||
8154 | begin | |
8155 | if Is_Derived_Type (F_Typ) | |
8156 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
8157 | then | |
82c80734 RD |
8158 | -- The tree must be traversed to determine the parent subtype in |
8159 | -- the generic unit, which unfortunately isn't always available | |
8160 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
8161 | -- is needed for cases where a full derived type has been | |
8162 | -- rewritten.) | |
996ae0b0 | 8163 | |
702d2020 AC |
8164 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); |
8165 | if Nkind (Defn) = N_Derived_Type_Definition then | |
8166 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 8167 | |
702d2020 AC |
8168 | if Nkind (Indic) = N_Subtype_Indication then |
8169 | G_Typ := Entity (Subtype_Mark (Indic)); | |
8170 | else | |
8171 | G_Typ := Entity (Indic); | |
8172 | end if; | |
996ae0b0 | 8173 | |
702d2020 AC |
8174 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
8175 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
8176 | then | |
8177 | return Generic_Parent_Type (Parent (G_Typ)); | |
8178 | end if; | |
996ae0b0 RK |
8179 | end if; |
8180 | end if; | |
8181 | ||
8182 | return Empty; | |
8183 | end Get_Generic_Parent_Type; | |
8184 | ||
8185 | ---------------------- | |
8186 | -- Types_Correspond -- | |
8187 | ---------------------- | |
8188 | ||
8189 | function Types_Correspond | |
8190 | (P_Type : Entity_Id; | |
d05ef0ab | 8191 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
8192 | is |
8193 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
8194 | New_Type : Entity_Id := Base_Type (N_Type); | |
8195 | ||
8196 | begin | |
8197 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
8198 | Prev_Type := Designated_Type (Prev_Type); | |
8199 | end if; | |
8200 | ||
8201 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
8202 | New_Type := Designated_Type (New_Type); | |
8203 | end if; | |
8204 | ||
8205 | if Prev_Type = New_Type then | |
8206 | return True; | |
8207 | ||
8208 | elsif not Is_Class_Wide_Type (New_Type) then | |
8209 | while Etype (New_Type) /= New_Type loop | |
8210 | New_Type := Etype (New_Type); | |
8211 | if New_Type = Prev_Type then | |
8212 | return True; | |
8213 | end if; | |
8214 | end loop; | |
8215 | end if; | |
8216 | return False; | |
8217 | end Types_Correspond; | |
8218 | ||
8219 | -- Start of processing for Is_Non_Overriding_Operation | |
8220 | ||
8221 | begin | |
82c80734 RD |
8222 | -- In the case where both operations are implicit derived subprograms |
8223 | -- then neither overrides the other. This can only occur in certain | |
8224 | -- obscure cases (e.g., derivation from homographs created in a generic | |
8225 | -- instantiation). | |
996ae0b0 RK |
8226 | |
8227 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
8228 | return True; | |
8229 | ||
8230 | elsif Ekind (Current_Scope) = E_Package | |
8231 | and then Is_Generic_Instance (Current_Scope) | |
8232 | and then In_Private_Part (Current_Scope) | |
8233 | and then Comes_From_Source (New_E) | |
8234 | then | |
702d2020 AC |
8235 | -- We examine the formals and result type of the inherited operation, |
8236 | -- to determine whether their type is derived from (the instance of) | |
8237 | -- a generic type. The first such formal or result type is the one | |
8238 | -- tested. | |
996ae0b0 RK |
8239 | |
8240 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
8241 | while Present (Formal) loop |
8242 | F_Typ := Base_Type (Etype (Formal)); | |
8243 | ||
8244 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
8245 | F_Typ := Designated_Type (F_Typ); | |
8246 | end if; | |
8247 | ||
8248 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 8249 | exit when Present (G_Typ); |
996ae0b0 RK |
8250 | |
8251 | Next_Formal (Formal); | |
8252 | end loop; | |
8253 | ||
c8ef728f | 8254 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
8255 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
8256 | end if; | |
8257 | ||
8258 | if No (G_Typ) then | |
8259 | return False; | |
8260 | end if; | |
8261 | ||
8dbd1460 AC |
8262 | -- If the generic type is a private type, then the original operation |
8263 | -- was not overriding in the generic, because there was no primitive | |
8264 | -- operation to override. | |
996ae0b0 RK |
8265 | |
8266 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
8267 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 8268 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
8269 | then |
8270 | return True; | |
8271 | ||
8272 | -- The generic parent type is the ancestor of a formal derived | |
8273 | -- type declaration. We need to check whether it has a primitive | |
8274 | -- operation that should be overridden by New_E in the generic. | |
8275 | ||
8276 | else | |
8277 | declare | |
8278 | P_Formal : Entity_Id; | |
8279 | N_Formal : Entity_Id; | |
8280 | P_Typ : Entity_Id; | |
8281 | N_Typ : Entity_Id; | |
8282 | P_Prim : Entity_Id; | |
8283 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
8284 | ||
8285 | begin | |
8286 | while Present (Prim_Elt) loop | |
8287 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 8288 | |
996ae0b0 RK |
8289 | if Chars (P_Prim) = Chars (New_E) |
8290 | and then Ekind (P_Prim) = Ekind (New_E) | |
8291 | then | |
8292 | P_Formal := First_Formal (P_Prim); | |
8293 | N_Formal := First_Formal (New_E); | |
8294 | while Present (P_Formal) and then Present (N_Formal) loop | |
8295 | P_Typ := Etype (P_Formal); | |
8296 | N_Typ := Etype (N_Formal); | |
8297 | ||
8298 | if not Types_Correspond (P_Typ, N_Typ) then | |
8299 | exit; | |
8300 | end if; | |
8301 | ||
8302 | Next_Entity (P_Formal); | |
8303 | Next_Entity (N_Formal); | |
8304 | end loop; | |
8305 | ||
82c80734 RD |
8306 | -- Found a matching primitive operation belonging to the |
8307 | -- formal ancestor type, so the new subprogram is | |
8308 | -- overriding. | |
996ae0b0 | 8309 | |
c8ef728f ES |
8310 | if No (P_Formal) |
8311 | and then No (N_Formal) | |
996ae0b0 RK |
8312 | and then (Ekind (New_E) /= E_Function |
8313 | or else | |
8fde064e AC |
8314 | Types_Correspond |
8315 | (Etype (P_Prim), Etype (New_E))) | |
996ae0b0 RK |
8316 | then |
8317 | return False; | |
8318 | end if; | |
8319 | end if; | |
8320 | ||
8321 | Next_Elmt (Prim_Elt); | |
8322 | end loop; | |
8323 | ||
2995860f AC |
8324 | -- If no match found, then the new subprogram does not override |
8325 | -- in the generic (nor in the instance). | |
996ae0b0 | 8326 | |
260359e3 AC |
8327 | -- If the type in question is not abstract, and the subprogram |
8328 | -- is, this will be an error if the new operation is in the | |
8329 | -- private part of the instance. Emit a warning now, which will | |
8330 | -- make the subsequent error message easier to understand. | |
8331 | ||
8332 | if not Is_Abstract_Type (F_Typ) | |
8333 | and then Is_Abstract_Subprogram (Prev_E) | |
8334 | and then In_Private_Part (Current_Scope) | |
8335 | then | |
8336 | Error_Msg_Node_2 := F_Typ; | |
8337 | Error_Msg_NE | |
8338 | ("private operation& in generic unit does not override " & | |
dbfeb4fa | 8339 | "any primitive operation of& (RM 12.3 (18))??", |
260359e3 AC |
8340 | New_E, New_E); |
8341 | end if; | |
8342 | ||
996ae0b0 RK |
8343 | return True; |
8344 | end; | |
8345 | end if; | |
8346 | else | |
8347 | return False; | |
8348 | end if; | |
8349 | end Is_Non_Overriding_Operation; | |
8350 | ||
beacce02 AC |
8351 | ------------------------------------- |
8352 | -- List_Inherited_Pre_Post_Aspects -- | |
8353 | ------------------------------------- | |
8354 | ||
8355 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
8356 | begin | |
e606088a | 8357 | if Opt.List_Inherited_Aspects |
beacce02 AC |
8358 | and then (Is_Subprogram (E) or else Is_Generic_Subprogram (E)) |
8359 | then | |
8360 | declare | |
dbfeb4fa | 8361 | Inherited : constant Subprogram_List := Inherited_Subprograms (E); |
beacce02 AC |
8362 | P : Node_Id; |
8363 | ||
8364 | begin | |
8365 | for J in Inherited'Range loop | |
d6095153 | 8366 | P := Pre_Post_Conditions (Contract (Inherited (J))); |
beacce02 AC |
8367 | while Present (P) loop |
8368 | Error_Msg_Sloc := Sloc (P); | |
8369 | ||
8370 | if Class_Present (P) and then not Split_PPC (P) then | |
8371 | if Pragma_Name (P) = Name_Precondition then | |
8372 | Error_Msg_N | |
685bc70f AC |
8373 | ("info: & inherits `Pre''Class` aspect from #?L?", |
8374 | E); | |
beacce02 AC |
8375 | else |
8376 | Error_Msg_N | |
685bc70f AC |
8377 | ("info: & inherits `Post''Class` aspect from #?L?", |
8378 | E); | |
beacce02 AC |
8379 | end if; |
8380 | end if; | |
8381 | ||
8382 | P := Next_Pragma (P); | |
8383 | end loop; | |
8384 | end loop; | |
8385 | end; | |
8386 | end if; | |
8387 | end List_Inherited_Pre_Post_Aspects; | |
8388 | ||
996ae0b0 RK |
8389 | ------------------------------ |
8390 | -- Make_Inequality_Operator -- | |
8391 | ------------------------------ | |
8392 | ||
8393 | -- S is the defining identifier of an equality operator. We build a | |
8394 | -- subprogram declaration with the right signature. This operation is | |
8395 | -- intrinsic, because it is always expanded as the negation of the | |
8396 | -- call to the equality function. | |
8397 | ||
8398 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
8399 | Loc : constant Source_Ptr := Sloc (S); | |
8400 | Decl : Node_Id; | |
8401 | Formals : List_Id; | |
8402 | Op_Name : Entity_Id; | |
8403 | ||
c8ef728f ES |
8404 | FF : constant Entity_Id := First_Formal (S); |
8405 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
8406 | |
8407 | begin | |
c8ef728f | 8408 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 8409 | |
c8ef728f | 8410 | if No (NF) then |
996ae0b0 RK |
8411 | return; |
8412 | end if; | |
8413 | ||
c8ef728f ES |
8414 | declare |
8415 | A : constant Entity_Id := | |
8416 | Make_Defining_Identifier (Sloc (FF), | |
8417 | Chars => Chars (FF)); | |
8418 | ||
5d37ba92 ES |
8419 | B : constant Entity_Id := |
8420 | Make_Defining_Identifier (Sloc (NF), | |
8421 | Chars => Chars (NF)); | |
c8ef728f ES |
8422 | |
8423 | begin | |
8424 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
8425 | ||
8426 | Formals := New_List ( | |
8427 | Make_Parameter_Specification (Loc, | |
8428 | Defining_Identifier => A, | |
8429 | Parameter_Type => | |
e4494292 | 8430 | New_Occurrence_Of (Etype (First_Formal (S)), |
c8ef728f ES |
8431 | Sloc (Etype (First_Formal (S))))), |
8432 | ||
8433 | Make_Parameter_Specification (Loc, | |
8434 | Defining_Identifier => B, | |
8435 | Parameter_Type => | |
e4494292 | 8436 | New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
c8ef728f ES |
8437 | Sloc (Etype (Next_Formal (First_Formal (S))))))); |
8438 | ||
8439 | Decl := | |
8440 | Make_Subprogram_Declaration (Loc, | |
8441 | Specification => | |
8442 | Make_Function_Specification (Loc, | |
8443 | Defining_Unit_Name => Op_Name, | |
8444 | Parameter_Specifications => Formals, | |
8445 | Result_Definition => | |
e4494292 | 8446 | New_Occurrence_Of (Standard_Boolean, Loc))); |
c8ef728f ES |
8447 | |
8448 | -- Insert inequality right after equality if it is explicit or after | |
8449 | -- the derived type when implicit. These entities are created only | |
2995860f AC |
8450 | -- for visibility purposes, and eventually replaced in the course |
8451 | -- of expansion, so they do not need to be attached to the tree and | |
8452 | -- seen by the back-end. Keeping them internal also avoids spurious | |
c8ef728f ES |
8453 | -- freezing problems. The declaration is inserted in the tree for |
8454 | -- analysis, and removed afterwards. If the equality operator comes | |
8455 | -- from an explicit declaration, attach the inequality immediately | |
8456 | -- after. Else the equality is inherited from a derived type | |
8457 | -- declaration, so insert inequality after that declaration. | |
8458 | ||
8459 | if No (Alias (S)) then | |
8460 | Insert_After (Unit_Declaration_Node (S), Decl); | |
8461 | elsif Is_List_Member (Parent (S)) then | |
8462 | Insert_After (Parent (S), Decl); | |
8463 | else | |
8464 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
8465 | end if; | |
996ae0b0 | 8466 | |
c8ef728f ES |
8467 | Mark_Rewrite_Insertion (Decl); |
8468 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
8469 | Analyze (Decl); | |
8470 | Remove (Decl); | |
8471 | Set_Has_Completion (Op_Name); | |
8472 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 8473 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 8474 | end; |
996ae0b0 RK |
8475 | end Make_Inequality_Operator; |
8476 | ||
8477 | ---------------------- | |
8478 | -- May_Need_Actuals -- | |
8479 | ---------------------- | |
8480 | ||
8481 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
8482 | F : Entity_Id; | |
8483 | B : Boolean; | |
8484 | ||
8485 | begin | |
8486 | F := First_Formal (Fun); | |
8487 | B := True; | |
996ae0b0 RK |
8488 | while Present (F) loop |
8489 | if No (Default_Value (F)) then | |
8490 | B := False; | |
8491 | exit; | |
8492 | end if; | |
8493 | ||
8494 | Next_Formal (F); | |
8495 | end loop; | |
8496 | ||
8497 | Set_Needs_No_Actuals (Fun, B); | |
8498 | end May_Need_Actuals; | |
8499 | ||
8500 | --------------------- | |
8501 | -- Mode_Conformant -- | |
8502 | --------------------- | |
8503 | ||
8504 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
8505 | Result : Boolean; | |
996ae0b0 RK |
8506 | begin |
8507 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
8508 | return Result; | |
8509 | end Mode_Conformant; | |
8510 | ||
8511 | --------------------------- | |
8512 | -- New_Overloaded_Entity -- | |
8513 | --------------------------- | |
8514 | ||
8515 | procedure New_Overloaded_Entity | |
8516 | (S : Entity_Id; | |
8517 | Derived_Type : Entity_Id := Empty) | |
8518 | is | |
ec4867fa | 8519 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
8520 | -- Set if the current scope has an operation that is type-conformant |
8521 | -- with S, and becomes hidden by S. | |
8522 | ||
5d37ba92 ES |
8523 | Is_Primitive_Subp : Boolean; |
8524 | -- Set to True if the new subprogram is primitive | |
8525 | ||
fbf5a39b AC |
8526 | E : Entity_Id; |
8527 | -- Entity that S overrides | |
8528 | ||
996ae0b0 | 8529 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
8530 | -- Predecessor of E in Homonym chain |
8531 | ||
5d37ba92 ES |
8532 | procedure Check_For_Primitive_Subprogram |
8533 | (Is_Primitive : out Boolean; | |
8534 | Is_Overriding : Boolean := False); | |
8535 | -- If the subprogram being analyzed is a primitive operation of the type | |
8536 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
8537 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
8538 | -- corresponding flag on the entity itself for later use. | |
8539 | ||
ec4867fa ES |
8540 | procedure Check_Synchronized_Overriding |
8541 | (Def_Id : Entity_Id; | |
ec4867fa ES |
8542 | Overridden_Subp : out Entity_Id); |
8543 | -- First determine if Def_Id is an entry or a subprogram either defined | |
8544 | -- in the scope of a task or protected type, or is a primitive of such | |
8545 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
8546 | -- implemented by the synchronized type, return the overridden entity | |
8547 | -- or Empty. | |
758c442c | 8548 | |
996ae0b0 RK |
8549 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
8550 | -- Check that E is declared in the private part of the current package, | |
8551 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 8552 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
8553 | -- set when freezing entities, so we must examine the place of the |
8554 | -- declaration in the tree, and recognize wrapper packages as well. | |
8555 | ||
2ddc2000 AC |
8556 | function Is_Overriding_Alias |
8557 | (Old_E : Entity_Id; | |
8558 | New_E : Entity_Id) return Boolean; | |
8559 | -- Check whether new subprogram and old subprogram are both inherited | |
8560 | -- from subprograms that have distinct dispatch table entries. This can | |
2995860f AC |
8561 | -- occur with derivations from instances with accidental homonyms. The |
8562 | -- function is conservative given that the converse is only true within | |
8563 | -- instances that contain accidental overloadings. | |
2ddc2000 | 8564 | |
5d37ba92 ES |
8565 | ------------------------------------ |
8566 | -- Check_For_Primitive_Subprogram -- | |
8567 | ------------------------------------ | |
996ae0b0 | 8568 | |
5d37ba92 ES |
8569 | procedure Check_For_Primitive_Subprogram |
8570 | (Is_Primitive : out Boolean; | |
8571 | Is_Overriding : Boolean := False) | |
ec4867fa | 8572 | is |
996ae0b0 RK |
8573 | Formal : Entity_Id; |
8574 | F_Typ : Entity_Id; | |
07fc65c4 | 8575 | B_Typ : Entity_Id; |
996ae0b0 RK |
8576 | |
8577 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
8578 | -- Returns true if T is declared in the visible part of the current |
8579 | -- package scope; otherwise returns false. Assumes that T is declared | |
8580 | -- in a package. | |
996ae0b0 RK |
8581 | |
8582 | procedure Check_Private_Overriding (T : Entity_Id); | |
8583 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
8584 | -- abstract type is declared in a private part, then it must override |
8585 | -- an abstract subprogram declared in the visible part. Also checks | |
8586 | -- that if a primitive function with a controlling result is declared | |
8587 | -- in a private part, then it must override a function declared in | |
8588 | -- the visible part. | |
996ae0b0 RK |
8589 | |
8590 | ------------------------------ | |
8591 | -- Check_Private_Overriding -- | |
8592 | ------------------------------ | |
8593 | ||
8594 | procedure Check_Private_Overriding (T : Entity_Id) is | |
8595 | begin | |
51c16e29 | 8596 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
8597 | and then In_Private_Part (Current_Scope) |
8598 | and then Visible_Part_Type (T) | |
8599 | and then not In_Instance | |
8600 | then | |
f937473f RD |
8601 | if Is_Abstract_Type (T) |
8602 | and then Is_Abstract_Subprogram (S) | |
8603 | and then (not Is_Overriding | |
8dbd1460 | 8604 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 8605 | then |
ed2233dc | 8606 | Error_Msg_N |
19d846a0 RD |
8607 | ("abstract subprograms must be visible " |
8608 | & "(RM 3.9.3(10))!", S); | |
758c442c | 8609 | |
8fde064e AC |
8610 | elsif Ekind (S) = E_Function and then not Is_Overriding then |
8611 | if Is_Tagged_Type (T) and then T = Base_Type (Etype (S)) then | |
2e79de51 AC |
8612 | Error_Msg_N |
8613 | ("private function with tagged result must" | |
8614 | & " override visible-part function", S); | |
8615 | Error_Msg_N | |
8616 | ("\move subprogram to the visible part" | |
8617 | & " (RM 3.9.3(10))", S); | |
8618 | ||
8619 | -- AI05-0073: extend this test to the case of a function | |
8620 | -- with a controlling access result. | |
8621 | ||
8622 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
8623 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
8624 | and then | |
8625 | not Is_Class_Wide_Type (Designated_Type (Etype (S))) | |
dbe945f1 | 8626 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
8627 | then |
8628 | Error_Msg_N | |
8629 | ("private function with controlling access result " | |
8630 | & "must override visible-part function", S); | |
8631 | Error_Msg_N | |
8632 | ("\move subprogram to the visible part" | |
8633 | & " (RM 3.9.3(10))", S); | |
8634 | end if; | |
996ae0b0 RK |
8635 | end if; |
8636 | end if; | |
8637 | end Check_Private_Overriding; | |
8638 | ||
8639 | ----------------------- | |
8640 | -- Visible_Part_Type -- | |
8641 | ----------------------- | |
8642 | ||
8643 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
8644 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
8645 | N : Node_Id; | |
996ae0b0 RK |
8646 | |
8647 | begin | |
8dbd1460 AC |
8648 | -- If the entity is a private type, then it must be declared in a |
8649 | -- visible part. | |
996ae0b0 RK |
8650 | |
8651 | if Ekind (T) in Private_Kind then | |
8652 | return True; | |
8653 | end if; | |
8654 | ||
8655 | -- Otherwise, we traverse the visible part looking for its | |
8656 | -- corresponding declaration. We cannot use the declaration | |
8657 | -- node directly because in the private part the entity of a | |
8658 | -- private type is the one in the full view, which does not | |
8659 | -- indicate that it is the completion of something visible. | |
8660 | ||
07fc65c4 | 8661 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
8662 | while Present (N) loop |
8663 | if Nkind (N) = N_Full_Type_Declaration | |
8664 | and then Present (Defining_Identifier (N)) | |
8665 | and then T = Defining_Identifier (N) | |
8666 | then | |
8667 | return True; | |
8668 | ||
800621e0 RD |
8669 | elsif Nkind_In (N, N_Private_Type_Declaration, |
8670 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
8671 | and then Present (Defining_Identifier (N)) |
8672 | and then T = Full_View (Defining_Identifier (N)) | |
8673 | then | |
8674 | return True; | |
8675 | end if; | |
8676 | ||
8677 | Next (N); | |
8678 | end loop; | |
8679 | ||
8680 | return False; | |
8681 | end Visible_Part_Type; | |
8682 | ||
5d37ba92 | 8683 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
8684 | |
8685 | begin | |
5d37ba92 ES |
8686 | Is_Primitive := False; |
8687 | ||
996ae0b0 RK |
8688 | if not Comes_From_Source (S) then |
8689 | null; | |
8690 | ||
5d37ba92 | 8691 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
8692 | |
8693 | elsif Current_Scope = Standard_Standard then | |
8694 | null; | |
8695 | ||
b9b2405f | 8696 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 8697 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 8698 | or else Is_Overriding |
996ae0b0 | 8699 | then |
07fc65c4 | 8700 | -- For function, check return type |
996ae0b0 | 8701 | |
07fc65c4 | 8702 | if Ekind (S) = E_Function then |
5d37ba92 ES |
8703 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
8704 | F_Typ := Designated_Type (Etype (S)); | |
8705 | else | |
8706 | F_Typ := Etype (S); | |
8707 | end if; | |
8708 | ||
8709 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 8710 | |
5d37ba92 ES |
8711 | if Scope (B_Typ) = Current_Scope |
8712 | and then not Is_Class_Wide_Type (B_Typ) | |
8713 | and then not Is_Generic_Type (B_Typ) | |
8714 | then | |
8715 | Is_Primitive := True; | |
07fc65c4 | 8716 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 8717 | Set_Is_Primitive (S); |
07fc65c4 GB |
8718 | Check_Private_Overriding (B_Typ); |
8719 | end if; | |
996ae0b0 RK |
8720 | end if; |
8721 | ||
07fc65c4 | 8722 | -- For all subprograms, check formals |
996ae0b0 | 8723 | |
07fc65c4 | 8724 | Formal := First_Formal (S); |
996ae0b0 RK |
8725 | while Present (Formal) loop |
8726 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
8727 | F_Typ := Designated_Type (Etype (Formal)); | |
8728 | else | |
8729 | F_Typ := Etype (Formal); | |
8730 | end if; | |
8731 | ||
07fc65c4 GB |
8732 | B_Typ := Base_Type (F_Typ); |
8733 | ||
ec4867fa ES |
8734 | if Ekind (B_Typ) = E_Access_Subtype then |
8735 | B_Typ := Base_Type (B_Typ); | |
8736 | end if; | |
8737 | ||
5d37ba92 ES |
8738 | if Scope (B_Typ) = Current_Scope |
8739 | and then not Is_Class_Wide_Type (B_Typ) | |
8740 | and then not Is_Generic_Type (B_Typ) | |
8741 | then | |
8742 | Is_Primitive := True; | |
8743 | Set_Is_Primitive (S); | |
07fc65c4 GB |
8744 | Set_Has_Primitive_Operations (B_Typ); |
8745 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
8746 | end if; |
8747 | ||
8748 | Next_Formal (Formal); | |
8749 | end loop; | |
1aee1fb3 AC |
8750 | |
8751 | -- Special case: An equality function can be redefined for a type | |
8752 | -- occurring in a declarative part, and won't otherwise be treated as | |
8753 | -- a primitive because it doesn't occur in a package spec and doesn't | |
8754 | -- override an inherited subprogram. It's important that we mark it | |
8755 | -- primitive so it can be returned by Collect_Primitive_Operations | |
8756 | -- and be used in composing the equality operation of later types | |
8757 | -- that have a component of the type. | |
8758 | ||
8759 | elsif Chars (S) = Name_Op_Eq | |
8760 | and then Etype (S) = Standard_Boolean | |
8761 | then | |
8762 | B_Typ := Base_Type (Etype (First_Formal (S))); | |
8763 | ||
8764 | if Scope (B_Typ) = Current_Scope | |
8765 | and then | |
8766 | Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ | |
8767 | and then not Is_Limited_Type (B_Typ) | |
8768 | then | |
8769 | Is_Primitive := True; | |
8770 | Set_Is_Primitive (S); | |
8771 | Set_Has_Primitive_Operations (B_Typ); | |
8772 | Check_Private_Overriding (B_Typ); | |
8773 | end if; | |
996ae0b0 | 8774 | end if; |
5d37ba92 ES |
8775 | end Check_For_Primitive_Subprogram; |
8776 | ||
8777 | ----------------------------------- | |
8778 | -- Check_Synchronized_Overriding -- | |
8779 | ----------------------------------- | |
8780 | ||
8781 | procedure Check_Synchronized_Overriding | |
8782 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
8783 | Overridden_Subp : out Entity_Id) |
8784 | is | |
5d37ba92 ES |
8785 | Ifaces_List : Elist_Id; |
8786 | In_Scope : Boolean; | |
8787 | Typ : Entity_Id; | |
8788 | ||
8aa15e3b JM |
8789 | function Matches_Prefixed_View_Profile |
8790 | (Prim_Params : List_Id; | |
8791 | Iface_Params : List_Id) return Boolean; | |
8792 | -- Determine whether a subprogram's parameter profile Prim_Params | |
8793 | -- matches that of a potentially overridden interface subprogram | |
8794 | -- Iface_Params. Also determine if the type of first parameter of | |
8795 | -- Iface_Params is an implemented interface. | |
8796 | ||
8aa15e3b JM |
8797 | ----------------------------------- |
8798 | -- Matches_Prefixed_View_Profile -- | |
8799 | ----------------------------------- | |
8800 | ||
8801 | function Matches_Prefixed_View_Profile | |
8802 | (Prim_Params : List_Id; | |
8803 | Iface_Params : List_Id) return Boolean | |
8804 | is | |
8805 | Iface_Id : Entity_Id; | |
8806 | Iface_Param : Node_Id; | |
8807 | Iface_Typ : Entity_Id; | |
8808 | Prim_Id : Entity_Id; | |
8809 | Prim_Param : Node_Id; | |
8810 | Prim_Typ : Entity_Id; | |
8811 | ||
8812 | function Is_Implemented | |
8813 | (Ifaces_List : Elist_Id; | |
8814 | Iface : Entity_Id) return Boolean; | |
8815 | -- Determine if Iface is implemented by the current task or | |
8816 | -- protected type. | |
8817 | ||
8818 | -------------------- | |
8819 | -- Is_Implemented -- | |
8820 | -------------------- | |
8821 | ||
8822 | function Is_Implemented | |
8823 | (Ifaces_List : Elist_Id; | |
8824 | Iface : Entity_Id) return Boolean | |
8825 | is | |
8826 | Iface_Elmt : Elmt_Id; | |
8827 | ||
8828 | begin | |
8829 | Iface_Elmt := First_Elmt (Ifaces_List); | |
8830 | while Present (Iface_Elmt) loop | |
8831 | if Node (Iface_Elmt) = Iface then | |
8832 | return True; | |
8833 | end if; | |
8834 | ||
8835 | Next_Elmt (Iface_Elmt); | |
8836 | end loop; | |
8837 | ||
8838 | return False; | |
8839 | end Is_Implemented; | |
8840 | ||
8841 | -- Start of processing for Matches_Prefixed_View_Profile | |
8842 | ||
8843 | begin | |
8844 | Iface_Param := First (Iface_Params); | |
8845 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
8846 | ||
8847 | if Is_Access_Type (Iface_Typ) then | |
8848 | Iface_Typ := Designated_Type (Iface_Typ); | |
8849 | end if; | |
8850 | ||
8851 | Prim_Param := First (Prim_Params); | |
8852 | ||
8853 | -- The first parameter of the potentially overridden subprogram | |
8854 | -- must be an interface implemented by Prim. | |
8855 | ||
8856 | if not Is_Interface (Iface_Typ) | |
8857 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
8858 | then | |
8859 | return False; | |
8860 | end if; | |
8861 | ||
8862 | -- The checks on the object parameters are done, move onto the | |
8863 | -- rest of the parameters. | |
8864 | ||
8865 | if not In_Scope then | |
8866 | Prim_Param := Next (Prim_Param); | |
8867 | end if; | |
8868 | ||
8869 | Iface_Param := Next (Iface_Param); | |
8870 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
8871 | Iface_Id := Defining_Identifier (Iface_Param); | |
8872 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
8873 | ||
8aa15e3b JM |
8874 | Prim_Id := Defining_Identifier (Prim_Param); |
8875 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
8876 | ||
15e4986c JM |
8877 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
8878 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
8879 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
8880 | then | |
8881 | Iface_Typ := Designated_Type (Iface_Typ); | |
8882 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
8883 | end if; |
8884 | ||
8885 | -- Case of multiple interface types inside a parameter profile | |
8886 | ||
8887 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
8888 | ||
8889 | -- If the interface type is implemented, then the matching type | |
8890 | -- in the primitive should be the implementing record type. | |
8891 | ||
8892 | if Ekind (Iface_Typ) = E_Record_Type | |
8893 | and then Is_Interface (Iface_Typ) | |
8894 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
8895 | then | |
8896 | if Prim_Typ /= Typ then | |
8897 | return False; | |
8898 | end if; | |
8899 | ||
8900 | -- The two parameters must be both mode and subtype conformant | |
8901 | ||
8902 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
8903 | or else not | |
8904 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
8905 | then | |
8906 | return False; | |
8907 | end if; | |
8908 | ||
8909 | Next (Iface_Param); | |
8910 | Next (Prim_Param); | |
8911 | end loop; | |
8912 | ||
8913 | -- One of the two lists contains more parameters than the other | |
8914 | ||
8915 | if Present (Iface_Param) or else Present (Prim_Param) then | |
8916 | return False; | |
8917 | end if; | |
8918 | ||
8919 | return True; | |
8920 | end Matches_Prefixed_View_Profile; | |
8921 | ||
8922 | -- Start of processing for Check_Synchronized_Overriding | |
8923 | ||
5d37ba92 ES |
8924 | begin |
8925 | Overridden_Subp := Empty; | |
8926 | ||
8aa15e3b JM |
8927 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
8928 | -- primitives internally generated by the frontend; however at this | |
8929 | -- stage predefined primitives are still not fully decorated. As a | |
8930 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 8931 | |
8aa15e3b JM |
8932 | if (Ekind (Def_Id) /= E_Entry |
8933 | and then Ekind (Def_Id) /= E_Function | |
8934 | and then Ekind (Def_Id) /= E_Procedure) | |
8935 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
8936 | then |
8937 | return; | |
8938 | end if; | |
8939 | ||
8940 | -- Search for the concurrent declaration since it contains the list | |
8941 | -- of all implemented interfaces. In this case, the subprogram is | |
8942 | -- declared within the scope of a protected or a task type. | |
8943 | ||
8944 | if Present (Scope (Def_Id)) | |
8945 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
8946 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
8947 | then | |
8948 | Typ := Scope (Def_Id); | |
8949 | In_Scope := True; | |
8950 | ||
8aa15e3b | 8951 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 8952 | -- has no formals. |
8aa15e3b JM |
8953 | |
8954 | elsif No (First_Formal (Def_Id)) then | |
8955 | return; | |
5d37ba92 | 8956 | |
8aa15e3b | 8957 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 8958 | -- concurrent type. |
5d37ba92 | 8959 | |
8aa15e3b JM |
8960 | else |
8961 | Typ := Etype (First_Formal (Def_Id)); | |
8962 | ||
8963 | if Is_Access_Type (Typ) then | |
8964 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
8965 | end if; |
8966 | ||
8aa15e3b JM |
8967 | if Is_Concurrent_Type (Typ) |
8968 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 8969 | then |
5d37ba92 ES |
8970 | In_Scope := False; |
8971 | ||
8972 | -- This case occurs when the concurrent type is declared within | |
8973 | -- a generic unit. As a result the corresponding record has been | |
8974 | -- built and used as the type of the first formal, we just have | |
8975 | -- to retrieve the corresponding concurrent type. | |
8976 | ||
8aa15e3b | 8977 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 8978 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 8979 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 8980 | then |
8aa15e3b | 8981 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
8982 | In_Scope := False; |
8983 | ||
8984 | else | |
8985 | return; | |
8986 | end if; | |
8aa15e3b JM |
8987 | end if; |
8988 | ||
8989 | -- There is no overriding to check if is an inherited operation in a | |
8990 | -- type derivation on for a generic actual. | |
8991 | ||
8992 | Collect_Interfaces (Typ, Ifaces_List); | |
8993 | ||
8994 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
8995 | return; |
8996 | end if; | |
8997 | ||
8aa15e3b JM |
8998 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
8999 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 9000 | |
8aa15e3b JM |
9001 | declare |
9002 | Candidate : Entity_Id := Empty; | |
9003 | Hom : Entity_Id := Empty; | |
9004 | Iface_Typ : Entity_Id; | |
9005 | Subp : Entity_Id := Empty; | |
9006 | ||
9007 | begin | |
4adf3c50 | 9008 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
9009 | -- overridden subprogram that belongs to an implemented |
9010 | -- interface. | |
9011 | ||
9012 | Hom := Current_Entity_In_Scope (Def_Id); | |
9013 | while Present (Hom) loop | |
9014 | Subp := Hom; | |
9015 | ||
15e4986c JM |
9016 | if Subp = Def_Id |
9017 | or else not Is_Overloadable (Subp) | |
9018 | or else not Is_Primitive (Subp) | |
9019 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 9020 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 9021 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 9022 | then |
15e4986c | 9023 | null; |
8aa15e3b | 9024 | |
15e4986c | 9025 | -- Entries and procedures can override abstract or null |
4adf3c50 | 9026 | -- interface procedures. |
8aa15e3b | 9027 | |
15e4986c | 9028 | elsif (Ekind (Def_Id) = E_Procedure |
8fde064e | 9029 | or else Ekind (Def_Id) = E_Entry) |
8aa15e3b | 9030 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
9031 | and then Matches_Prefixed_View_Profile |
9032 | (Parameter_Specifications (Parent (Def_Id)), | |
9033 | Parameter_Specifications (Parent (Subp))) | |
9034 | then | |
9035 | Candidate := Subp; | |
9036 | ||
15e4986c JM |
9037 | -- For an overridden subprogram Subp, check whether the mode |
9038 | -- of its first parameter is correct depending on the kind | |
9039 | -- of synchronized type. | |
8aa15e3b | 9040 | |
15e4986c JM |
9041 | declare |
9042 | Formal : constant Node_Id := First_Formal (Candidate); | |
9043 | ||
9044 | begin | |
9045 | -- In order for an entry or a protected procedure to | |
9046 | -- override, the first parameter of the overridden | |
9047 | -- routine must be of mode "out", "in out" or | |
9048 | -- access-to-variable. | |
9049 | ||
8fde064e | 9050 | if Ekind_In (Candidate, E_Entry, E_Procedure) |
15e4986c JM |
9051 | and then Is_Protected_Type (Typ) |
9052 | and then Ekind (Formal) /= E_In_Out_Parameter | |
9053 | and then Ekind (Formal) /= E_Out_Parameter | |
8fde064e AC |
9054 | and then Nkind (Parameter_Type (Parent (Formal))) /= |
9055 | N_Access_Definition | |
15e4986c JM |
9056 | then |
9057 | null; | |
9058 | ||
9059 | -- All other cases are OK since a task entry or routine | |
9060 | -- does not have a restriction on the mode of the first | |
9061 | -- parameter of the overridden interface routine. | |
9062 | ||
9063 | else | |
9064 | Overridden_Subp := Candidate; | |
9065 | return; | |
9066 | end if; | |
9067 | end; | |
8aa15e3b JM |
9068 | |
9069 | -- Functions can override abstract interface functions | |
9070 | ||
9071 | elsif Ekind (Def_Id) = E_Function | |
9072 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
9073 | and then Matches_Prefixed_View_Profile |
9074 | (Parameter_Specifications (Parent (Def_Id)), | |
9075 | Parameter_Specifications (Parent (Subp))) | |
9076 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
9077 | Etype (Result_Definition (Parent (Subp))) | |
9078 | then | |
9079 | Overridden_Subp := Subp; | |
9080 | return; | |
9081 | end if; | |
9082 | ||
9083 | Hom := Homonym (Hom); | |
9084 | end loop; | |
9085 | ||
4adf3c50 AC |
9086 | -- After examining all candidates for overriding, we are left with |
9087 | -- the best match which is a mode incompatible interface routine. | |
9088 | -- Do not emit an error if the Expander is active since this error | |
9089 | -- will be detected later on after all concurrent types are | |
9090 | -- expanded and all wrappers are built. This check is meant for | |
9091 | -- spec-only compilations. | |
8aa15e3b | 9092 | |
4adf3c50 | 9093 | if Present (Candidate) and then not Expander_Active then |
8aa15e3b JM |
9094 | Iface_Typ := |
9095 | Find_Parameter_Type (Parent (First_Formal (Candidate))); | |
9096 | ||
4adf3c50 AC |
9097 | -- Def_Id is primitive of a protected type, declared inside the |
9098 | -- type, and the candidate is primitive of a limited or | |
9099 | -- synchronized interface. | |
8aa15e3b JM |
9100 | |
9101 | if In_Scope | |
9102 | and then Is_Protected_Type (Typ) | |
9103 | and then | |
9104 | (Is_Limited_Interface (Iface_Typ) | |
c199ccf7 AC |
9105 | or else Is_Protected_Interface (Iface_Typ) |
9106 | or else Is_Synchronized_Interface (Iface_Typ) | |
9107 | or else Is_Task_Interface (Iface_Typ)) | |
8aa15e3b | 9108 | then |
dd54644b | 9109 | Error_Msg_PT (Parent (Typ), Candidate); |
8aa15e3b | 9110 | end if; |
5d37ba92 | 9111 | end if; |
8aa15e3b JM |
9112 | |
9113 | Overridden_Subp := Candidate; | |
9114 | return; | |
9115 | end; | |
5d37ba92 ES |
9116 | end Check_Synchronized_Overriding; |
9117 | ||
9118 | ---------------------------- | |
9119 | -- Is_Private_Declaration -- | |
9120 | ---------------------------- | |
9121 | ||
9122 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
9123 | Priv_Decls : List_Id; | |
9124 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
9125 | ||
9126 | begin | |
9127 | if Is_Package_Or_Generic_Package (Current_Scope) | |
9128 | and then In_Private_Part (Current_Scope) | |
9129 | then | |
9130 | Priv_Decls := | |
d12b19fa | 9131 | Private_Declarations (Package_Specification (Current_Scope)); |
5d37ba92 ES |
9132 | |
9133 | return In_Package_Body (Current_Scope) | |
9134 | or else | |
9135 | (Is_List_Member (Decl) | |
a4901c08 | 9136 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 9137 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
9138 | and then not |
9139 | Is_Compilation_Unit | |
9140 | (Defining_Entity (Parent (Decl))) | |
9141 | and then List_Containing (Parent (Parent (Decl))) = | |
9142 | Priv_Decls); | |
5d37ba92 ES |
9143 | else |
9144 | return False; | |
9145 | end if; | |
9146 | end Is_Private_Declaration; | |
996ae0b0 | 9147 | |
2ddc2000 AC |
9148 | -------------------------- |
9149 | -- Is_Overriding_Alias -- | |
9150 | -------------------------- | |
9151 | ||
9152 | function Is_Overriding_Alias | |
9153 | (Old_E : Entity_Id; | |
9154 | New_E : Entity_Id) return Boolean | |
9155 | is | |
9156 | AO : constant Entity_Id := Alias (Old_E); | |
9157 | AN : constant Entity_Id := Alias (New_E); | |
2ddc2000 AC |
9158 | begin |
9159 | return Scope (AO) /= Scope (AN) | |
9160 | or else No (DTC_Entity (AO)) | |
9161 | or else No (DTC_Entity (AN)) | |
9162 | or else DT_Position (AO) = DT_Position (AN); | |
9163 | end Is_Overriding_Alias; | |
9164 | ||
996ae0b0 RK |
9165 | -- Start of processing for New_Overloaded_Entity |
9166 | ||
9167 | begin | |
fbf5a39b AC |
9168 | -- We need to look for an entity that S may override. This must be a |
9169 | -- homonym in the current scope, so we look for the first homonym of | |
9170 | -- S in the current scope as the starting point for the search. | |
9171 | ||
9172 | E := Current_Entity_In_Scope (S); | |
9173 | ||
947430d5 AC |
9174 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
9175 | -- They are directly added to the list of primitive operations of | |
9176 | -- Derived_Type, unless this is a rederivation in the private part | |
9177 | -- of an operation that was already derived in the visible part of | |
9178 | -- the current package. | |
9179 | ||
0791fbe9 | 9180 | if Ada_Version >= Ada_2005 |
947430d5 AC |
9181 | and then Present (Derived_Type) |
9182 | and then Present (Alias (S)) | |
9183 | and then Is_Dispatching_Operation (Alias (S)) | |
9184 | and then Present (Find_Dispatching_Type (Alias (S))) | |
9185 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
9186 | then | |
9187 | -- For private types, when the full-view is processed we propagate to | |
9188 | -- the full view the non-overridden entities whose attribute "alias" | |
9189 | -- references an interface primitive. These entities were added by | |
9190 | -- Derive_Subprograms to ensure that interface primitives are | |
9191 | -- covered. | |
9192 | ||
9193 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
9194 | -- internal entity that links an interface primitive with its | |
9195 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 9196 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
9197 | |
9198 | if Inside_Freezing_Actions = 0 | |
9199 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
9200 | and then In_Private_Part (Current_Scope) | |
9201 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
9202 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
9203 | and then Full_View (Defining_Identifier (Parent (E))) | |
9204 | = Defining_Identifier (Parent (S)) | |
9205 | and then Alias (E) = Alias (S) | |
9206 | then | |
9207 | Check_Operation_From_Private_View (S, E); | |
9208 | Set_Is_Dispatching_Operation (S); | |
9209 | ||
9210 | -- Common case | |
9211 | ||
9212 | else | |
9213 | Enter_Overloaded_Entity (S); | |
9214 | Check_Dispatching_Operation (S, Empty); | |
9215 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
9216 | end if; | |
9217 | ||
9218 | return; | |
9219 | end if; | |
9220 | ||
fbf5a39b AC |
9221 | -- If there is no homonym then this is definitely not overriding |
9222 | ||
996ae0b0 RK |
9223 | if No (E) then |
9224 | Enter_Overloaded_Entity (S); | |
9225 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9226 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 9227 | |
2995860f AC |
9228 | -- If subprogram has an explicit declaration, check whether it has an |
9229 | -- overriding indicator. | |
758c442c | 9230 | |
ec4867fa | 9231 | if Comes_From_Source (S) then |
8aa15e3b | 9232 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
9233 | |
9234 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
9235 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 9236 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
9237 | -- overriding indicator. |
9238 | ||
9239 | if Ada_Version >= Ada_2012 | |
9240 | and then No (Overridden_Subp) | |
9241 | and then Is_Dispatching_Operation (S) | |
038140ed | 9242 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
9243 | then |
9244 | Overridden_Subp := Overridden_Operation (S); | |
9245 | end if; | |
9246 | ||
5d37ba92 ES |
9247 | Check_Overriding_Indicator |
9248 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
758c442c GD |
9249 | end if; |
9250 | ||
fbf5a39b AC |
9251 | -- If there is a homonym that is not overloadable, then we have an |
9252 | -- error, except for the special cases checked explicitly below. | |
9253 | ||
996ae0b0 RK |
9254 | elsif not Is_Overloadable (E) then |
9255 | ||
9256 | -- Check for spurious conflict produced by a subprogram that has the | |
9257 | -- same name as that of the enclosing generic package. The conflict | |
9258 | -- occurs within an instance, between the subprogram and the renaming | |
9259 | -- declaration for the package. After the subprogram, the package | |
9260 | -- renaming declaration becomes hidden. | |
9261 | ||
9262 | if Ekind (E) = E_Package | |
9263 | and then Present (Renamed_Object (E)) | |
9264 | and then Renamed_Object (E) = Current_Scope | |
9265 | and then Nkind (Parent (Renamed_Object (E))) = | |
9266 | N_Package_Specification | |
9267 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
9268 | then | |
9269 | Set_Is_Hidden (E); | |
9270 | Set_Is_Immediately_Visible (E, False); | |
9271 | Enter_Overloaded_Entity (S); | |
9272 | Set_Homonym (S, Homonym (E)); | |
9273 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9274 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
9275 | |
9276 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
9277 | -- declaration. However if it is dispatching, it must appear in the |
9278 | -- dispatch table anyway, because it can be dispatched to even if it | |
9279 | -- cannot be called directly. | |
996ae0b0 | 9280 | |
4adf3c50 | 9281 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
9282 | Set_Scope (S, Current_Scope); |
9283 | ||
9284 | if Is_Dispatching_Operation (Alias (S)) then | |
9285 | Check_Dispatching_Operation (S, Empty); | |
9286 | end if; | |
9287 | ||
9288 | return; | |
9289 | ||
9290 | else | |
9291 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 9292 | |
f3d57416 | 9293 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
9294 | |
9295 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
9296 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
9297 | Error_Msg_N ("\& conflicts with declaration#", S); | |
9298 | else | |
9299 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
9300 | end if; |
9301 | ||
9302 | return; | |
9303 | end if; | |
9304 | ||
fbf5a39b AC |
9305 | -- E exists and is overloadable |
9306 | ||
996ae0b0 | 9307 | else |
8aa15e3b | 9308 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 9309 | |
82c80734 RD |
9310 | -- Loop through E and its homonyms to determine if any of them is |
9311 | -- the candidate for overriding by S. | |
996ae0b0 RK |
9312 | |
9313 | while Present (E) loop | |
fbf5a39b AC |
9314 | |
9315 | -- Definitely not interesting if not in the current scope | |
9316 | ||
996ae0b0 RK |
9317 | if Scope (E) /= Current_Scope then |
9318 | null; | |
9319 | ||
aca90db9 AC |
9320 | -- A function can overload the name of an abstract state. The |
9321 | -- state can be viewed as a function with a profile that cannot | |
9322 | -- be matched by anything. | |
9323 | ||
9324 | elsif Ekind (S) = E_Function | |
9325 | and then Ekind (E) = E_Abstract_State | |
9326 | then | |
9327 | Enter_Overloaded_Entity (S); | |
9328 | return; | |
9329 | ||
2995860f AC |
9330 | -- Ada 2012 (AI05-0165): For internally generated bodies of null |
9331 | -- procedures locate the internally generated spec. We enforce | |
9332 | -- mode conformance since a tagged type may inherit from | |
9333 | -- interfaces several null primitives which differ only in | |
9334 | -- the mode of the formals. | |
25ebc085 AC |
9335 | |
9336 | elsif not Comes_From_Source (S) | |
9337 | and then Is_Null_Procedure (S) | |
9338 | and then not Mode_Conformant (E, S) | |
9339 | then | |
9340 | null; | |
9341 | ||
fbf5a39b AC |
9342 | -- Check if we have type conformance |
9343 | ||
ec4867fa | 9344 | elsif Type_Conformant (E, S) then |
c8ef728f | 9345 | |
82c80734 RD |
9346 | -- If the old and new entities have the same profile and one |
9347 | -- is not the body of the other, then this is an error, unless | |
9348 | -- one of them is implicitly declared. | |
996ae0b0 RK |
9349 | |
9350 | -- There are some cases when both can be implicit, for example | |
9351 | -- when both a literal and a function that overrides it are | |
f3d57416 | 9352 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 9353 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 9354 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 9355 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
9356 | -- the former, and the literal is always the former. In the |
9357 | -- odd case where both are derived operations declared at the | |
9358 | -- same point, both operations should be declared, and in that | |
9359 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
9360 | -- part. This can only occur for certain obscure cases in |
9361 | -- instances, when an operation on a type derived from a formal | |
9362 | -- private type does not override a homograph inherited from | |
9363 | -- the actual. In subsequent derivations of such a type, the | |
9364 | -- DT positions of these operations remain distinct, if they | |
9365 | -- have been set. | |
996ae0b0 RK |
9366 | |
9367 | if Present (Alias (S)) | |
9368 | and then (No (Alias (E)) | |
9369 | or else Comes_From_Source (E) | |
2ddc2000 | 9370 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
9371 | or else |
9372 | (Is_Dispatching_Operation (E) | |
84c0a895 | 9373 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 9374 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 9375 | then |
82c80734 RD |
9376 | -- When an derived operation is overloaded it may be due to |
9377 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
9378 | -- re-inherits. It has to be dealt with. |
9379 | ||
e660dbf7 | 9380 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
9381 | and then In_Private_Part (Current_Scope) |
9382 | then | |
9383 | Check_Operation_From_Private_View (S, E); | |
9384 | end if; | |
9385 | ||
038140ed AC |
9386 | -- In any case the implicit operation remains hidden by the |
9387 | -- existing declaration, which is overriding. Indicate that | |
9388 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 9389 | |
038140ed AC |
9390 | if Present (Alias (S)) then |
9391 | Set_Overridden_Operation (E, Alias (S)); | |
9392 | else | |
9393 | Set_Overridden_Operation (E, S); | |
9394 | end if; | |
758c442c GD |
9395 | |
9396 | if Comes_From_Source (E) then | |
5d37ba92 | 9397 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
758c442c GD |
9398 | end if; |
9399 | ||
996ae0b0 RK |
9400 | return; |
9401 | ||
26a43556 AC |
9402 | -- Within an instance, the renaming declarations for actual |
9403 | -- subprograms may become ambiguous, but they do not hide each | |
9404 | -- other. | |
996ae0b0 RK |
9405 | |
9406 | elsif Ekind (E) /= E_Entry | |
9407 | and then not Comes_From_Source (E) | |
9408 | and then not Is_Generic_Instance (E) | |
9409 | and then (Present (Alias (E)) | |
9410 | or else Is_Intrinsic_Subprogram (E)) | |
9411 | and then (not In_Instance | |
9412 | or else No (Parent (E)) | |
9413 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 9414 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 9415 | then |
26a43556 AC |
9416 | -- A subprogram child unit is not allowed to override an |
9417 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
9418 | |
9419 | if Is_Child_Unit (S) then | |
9420 | Error_Msg_N | |
9421 | ("child unit overrides inherited subprogram in parent", | |
9422 | S); | |
9423 | return; | |
9424 | end if; | |
9425 | ||
9426 | if Is_Non_Overriding_Operation (E, S) then | |
9427 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 9428 | |
c8ef728f | 9429 | if No (Derived_Type) |
996ae0b0 RK |
9430 | or else Is_Tagged_Type (Derived_Type) |
9431 | then | |
9432 | Check_Dispatching_Operation (S, Empty); | |
9433 | end if; | |
9434 | ||
9435 | return; | |
9436 | end if; | |
9437 | ||
9438 | -- E is a derived operation or an internal operator which | |
9439 | -- is being overridden. Remove E from further visibility. | |
9440 | -- Furthermore, if E is a dispatching operation, it must be | |
9441 | -- replaced in the list of primitive operations of its type | |
9442 | -- (see Override_Dispatching_Operation). | |
9443 | ||
ec4867fa | 9444 | Overridden_Subp := E; |
758c442c | 9445 | |
996ae0b0 RK |
9446 | declare |
9447 | Prev : Entity_Id; | |
9448 | ||
9449 | begin | |
9450 | Prev := First_Entity (Current_Scope); | |
8fde064e | 9451 | while Present (Prev) and then Next_Entity (Prev) /= E loop |
996ae0b0 RK |
9452 | Next_Entity (Prev); |
9453 | end loop; | |
9454 | ||
9455 | -- It is possible for E to be in the current scope and | |
9456 | -- yet not in the entity chain. This can only occur in a | |
9457 | -- generic context where E is an implicit concatenation | |
9458 | -- in the formal part, because in a generic body the | |
9459 | -- entity chain starts with the formals. | |
9460 | ||
9461 | pragma Assert | |
9462 | (Present (Prev) or else Chars (E) = Name_Op_Concat); | |
9463 | ||
9464 | -- E must be removed both from the entity_list of the | |
9465 | -- current scope, and from the visibility chain | |
9466 | ||
9467 | if Debug_Flag_E then | |
9468 | Write_Str ("Override implicit operation "); | |
9469 | Write_Int (Int (E)); | |
9470 | Write_Eol; | |
9471 | end if; | |
9472 | ||
9473 | -- If E is a predefined concatenation, it stands for four | |
9474 | -- different operations. As a result, a single explicit | |
9475 | -- declaration does not hide it. In a possible ambiguous | |
9476 | -- situation, Disambiguate chooses the user-defined op, | |
9477 | -- so it is correct to retain the previous internal one. | |
9478 | ||
9479 | if Chars (E) /= Name_Op_Concat | |
9480 | or else Ekind (E) /= E_Operator | |
9481 | then | |
9482 | -- For nondispatching derived operations that are | |
9483 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
9484 | -- part of a package, we retain the derived subprogram |
9485 | -- but mark it as not immediately visible. If the | |
9486 | -- derived operation was declared in the visible part | |
9487 | -- then this ensures that it will still be visible | |
9488 | -- outside the package with the proper signature | |
9489 | -- (calls from outside must also be directed to this | |
9490 | -- version rather than the overriding one, unlike the | |
9491 | -- dispatching case). Calls from inside the package | |
9492 | -- will still resolve to the overriding subprogram | |
9493 | -- since the derived one is marked as not visible | |
9494 | -- within the package. | |
996ae0b0 RK |
9495 | |
9496 | -- If the private operation is dispatching, we achieve | |
9497 | -- the overriding by keeping the implicit operation | |
9865d858 | 9498 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
9499 | -- this fashion the proper body is executed in all |
9500 | -- cases, but the original signature is used outside | |
9501 | -- of the package. | |
9502 | ||
9503 | -- If the overriding is not in the private part, we | |
9504 | -- remove the implicit operation altogether. | |
9505 | ||
9506 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
9507 | if not Is_Dispatching_Operation (E) then |
9508 | Set_Is_Immediately_Visible (E, False); | |
9509 | else | |
e895b435 | 9510 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 9511 | -- so nothing else needs to be done here. |
996ae0b0 RK |
9512 | |
9513 | null; | |
9514 | end if; | |
996ae0b0 | 9515 | |
fbf5a39b AC |
9516 | else |
9517 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
9518 | |
9519 | if E = Current_Entity (E) then | |
9520 | Prev_Vis := Empty; | |
9521 | else | |
9522 | Prev_Vis := Current_Entity (E); | |
9523 | while Homonym (Prev_Vis) /= E loop | |
9524 | Prev_Vis := Homonym (Prev_Vis); | |
9525 | end loop; | |
9526 | end if; | |
9527 | ||
9528 | if Prev_Vis /= Empty then | |
9529 | ||
9530 | -- Skip E in the visibility chain | |
9531 | ||
9532 | Set_Homonym (Prev_Vis, Homonym (E)); | |
9533 | ||
9534 | else | |
9535 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
9536 | end if; | |
9537 | ||
9538 | Set_Next_Entity (Prev, Next_Entity (E)); | |
9539 | ||
9540 | if No (Next_Entity (Prev)) then | |
9541 | Set_Last_Entity (Current_Scope, Prev); | |
9542 | end if; | |
996ae0b0 RK |
9543 | end if; |
9544 | end if; | |
9545 | ||
9546 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
9547 | |
9548 | -- For entities generated by Derive_Subprograms the | |
9549 | -- overridden operation is the inherited primitive | |
9550 | -- (which is available through the attribute alias). | |
9551 | ||
9552 | if not (Comes_From_Source (E)) | |
9553 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
9554 | and then Find_Dispatching_Type (E) = |
9555 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
9556 | and then Present (Alias (E)) |
9557 | and then Comes_From_Source (Alias (E)) | |
9558 | then | |
9559 | Set_Overridden_Operation (S, Alias (E)); | |
2fe829ae | 9560 | |
6320f5e1 AC |
9561 | -- Normal case of setting entity as overridden |
9562 | ||
9563 | -- Note: Static_Initialization and Overridden_Operation | |
9564 | -- attributes use the same field in subprogram entities. | |
9565 | -- Static_Initialization is only defined for internal | |
9566 | -- initialization procedures, where Overridden_Operation | |
9567 | -- is irrelevant. Therefore the setting of this attribute | |
9568 | -- must check whether the target is an init_proc. | |
9569 | ||
2fe829ae | 9570 | elsif not Is_Init_Proc (S) then |
1c1289e7 AC |
9571 | Set_Overridden_Operation (S, E); |
9572 | end if; | |
9573 | ||
5d37ba92 | 9574 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 9575 | |
fc53fe76 | 9576 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
9577 | -- expanded to override an inherited null procedure, or a |
9578 | -- predefined dispatching primitive then indicate that E | |
038140ed | 9579 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
9580 | |
9581 | if Comes_From_Source (S) | |
9582 | or else | |
9583 | (Present (Parent (S)) | |
9584 | and then | |
9585 | Nkind (Parent (S)) = N_Procedure_Specification | |
9586 | and then | |
9587 | Null_Present (Parent (S))) | |
38ef8ebe AC |
9588 | or else |
9589 | (Present (Alias (E)) | |
f16e8df9 RD |
9590 | and then |
9591 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 9592 | then |
c8ef728f | 9593 | if Present (Alias (E)) then |
41251c60 | 9594 | Set_Overridden_Operation (S, Alias (E)); |
41251c60 JM |
9595 | end if; |
9596 | end if; | |
9597 | ||
996ae0b0 | 9598 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 9599 | |
82c80734 | 9600 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 9601 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
9602 | |
9603 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
9604 | Check_Dispatching_Operation (S, E); |
9605 | ||
996ae0b0 RK |
9606 | else |
9607 | Check_Dispatching_Operation (S, Empty); | |
9608 | end if; | |
9609 | ||
5d37ba92 ES |
9610 | Check_For_Primitive_Subprogram |
9611 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
9612 | goto Check_Inequality; |
9613 | end; | |
9614 | ||
9615 | -- Apparent redeclarations in instances can occur when two | |
9616 | -- formal types get the same actual type. The subprograms in | |
9617 | -- in the instance are legal, even if not callable from the | |
9618 | -- outside. Calls from within are disambiguated elsewhere. | |
9619 | -- For dispatching operations in the visible part, the usual | |
9620 | -- rules apply, and operations with the same profile are not | |
9621 | -- legal (B830001). | |
9622 | ||
9623 | elsif (In_Instance_Visible_Part | |
9624 | and then not Is_Dispatching_Operation (E)) | |
9625 | or else In_Instance_Not_Visible | |
9626 | then | |
9627 | null; | |
9628 | ||
9629 | -- Here we have a real error (identical profile) | |
9630 | ||
9631 | else | |
9632 | Error_Msg_Sloc := Sloc (E); | |
9633 | ||
9634 | -- Avoid cascaded errors if the entity appears in | |
9635 | -- subsequent calls. | |
9636 | ||
9637 | Set_Scope (S, Current_Scope); | |
9638 | ||
5d37ba92 ES |
9639 | -- Generate error, with extra useful warning for the case |
9640 | -- of a generic instance with no completion. | |
996ae0b0 RK |
9641 | |
9642 | if Is_Generic_Instance (S) | |
9643 | and then not Has_Completion (E) | |
9644 | then | |
9645 | Error_Msg_N | |
5d37ba92 ES |
9646 | ("instantiation cannot provide body for&", S); |
9647 | Error_Msg_N ("\& conflicts with declaration#", S); | |
9648 | else | |
9649 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
9650 | end if; |
9651 | ||
9652 | return; | |
9653 | end if; | |
9654 | ||
9655 | else | |
c8ef728f ES |
9656 | -- If one subprogram has an access parameter and the other |
9657 | -- a parameter of an access type, calls to either might be | |
9658 | -- ambiguous. Verify that parameters match except for the | |
9659 | -- access parameter. | |
9660 | ||
9661 | if May_Hide_Profile then | |
9662 | declare | |
ec4867fa ES |
9663 | F1 : Entity_Id; |
9664 | F2 : Entity_Id; | |
8dbd1460 | 9665 | |
c8ef728f ES |
9666 | begin |
9667 | F1 := First_Formal (S); | |
9668 | F2 := First_Formal (E); | |
9669 | while Present (F1) and then Present (F2) loop | |
9670 | if Is_Access_Type (Etype (F1)) then | |
9671 | if not Is_Access_Type (Etype (F2)) | |
9672 | or else not Conforming_Types | |
9673 | (Designated_Type (Etype (F1)), | |
9674 | Designated_Type (Etype (F2)), | |
9675 | Type_Conformant) | |
9676 | then | |
9677 | May_Hide_Profile := False; | |
9678 | end if; | |
9679 | ||
9680 | elsif | |
9681 | not Conforming_Types | |
9682 | (Etype (F1), Etype (F2), Type_Conformant) | |
9683 | then | |
9684 | May_Hide_Profile := False; | |
9685 | end if; | |
9686 | ||
9687 | Next_Formal (F1); | |
9688 | Next_Formal (F2); | |
9689 | end loop; | |
9690 | ||
9691 | if May_Hide_Profile | |
9692 | and then No (F1) | |
9693 | and then No (F2) | |
9694 | then | |
dbfeb4fa | 9695 | Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
c8ef728f ES |
9696 | end if; |
9697 | end; | |
9698 | end if; | |
996ae0b0 RK |
9699 | end if; |
9700 | ||
996ae0b0 RK |
9701 | E := Homonym (E); |
9702 | end loop; | |
9703 | ||
9704 | -- On exit, we know that S is a new entity | |
9705 | ||
9706 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
9707 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
9708 | Check_Overriding_Indicator | |
9709 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 9710 | |
c4d67e2d | 9711 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 9712 | |
c4d67e2d AC |
9713 | if Nkind (S) /= N_Defining_Operator_Symbol then |
9714 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
9715 | Check_SPARK_Restriction | |
9716 | ("overloading not allowed with entity#", S); | |
9717 | end if; | |
8ed68165 | 9718 | |
82c80734 RD |
9719 | -- If S is a derived operation for an untagged type then by |
9720 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
9721 | -- operation was dispatching), so Check_Dispatching_Operation is not |
9722 | -- called in that case. | |
996ae0b0 | 9723 | |
c8ef728f | 9724 | if No (Derived_Type) |
996ae0b0 RK |
9725 | or else Is_Tagged_Type (Derived_Type) |
9726 | then | |
9727 | Check_Dispatching_Operation (S, Empty); | |
9728 | end if; | |
9729 | end if; | |
9730 | ||
82c80734 RD |
9731 | -- If this is a user-defined equality operator that is not a derived |
9732 | -- subprogram, create the corresponding inequality. If the operation is | |
9733 | -- dispatching, the expansion is done elsewhere, and we do not create | |
9734 | -- an explicit inequality operation. | |
996ae0b0 RK |
9735 | |
9736 | <<Check_Inequality>> | |
9737 | if Chars (S) = Name_Op_Eq | |
9738 | and then Etype (S) = Standard_Boolean | |
9739 | and then Present (Parent (S)) | |
9740 | and then not Is_Dispatching_Operation (S) | |
9741 | then | |
9742 | Make_Inequality_Operator (S); | |
b2834fbd | 9743 | Check_Untagged_Equality (S); |
996ae0b0 | 9744 | end if; |
996ae0b0 RK |
9745 | end New_Overloaded_Entity; |
9746 | ||
9747 | --------------------- | |
9748 | -- Process_Formals -- | |
9749 | --------------------- | |
9750 | ||
9751 | procedure Process_Formals | |
07fc65c4 | 9752 | (T : List_Id; |
996ae0b0 RK |
9753 | Related_Nod : Node_Id) |
9754 | is | |
9755 | Param_Spec : Node_Id; | |
9756 | Formal : Entity_Id; | |
9757 | Formal_Type : Entity_Id; | |
9758 | Default : Node_Id; | |
9759 | Ptype : Entity_Id; | |
9760 | ||
800621e0 RD |
9761 | Num_Out_Params : Nat := 0; |
9762 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 9763 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 9764 | |
7b56a91b | 9765 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
950d217a AC |
9766 | -- Determine whether an access type designates a type coming from a |
9767 | -- limited view. | |
9768 | ||
07fc65c4 | 9769 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
9770 | -- Check whether the default has a class-wide type. After analysis the |
9771 | -- default has the type of the formal, so we must also check explicitly | |
9772 | -- for an access attribute. | |
07fc65c4 | 9773 | |
7b56a91b AC |
9774 | ---------------------------------- |
9775 | -- Designates_From_Limited_With -- | |
9776 | ---------------------------------- | |
950d217a | 9777 | |
7b56a91b | 9778 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
950d217a AC |
9779 | Desig : Entity_Id := Typ; |
9780 | ||
9781 | begin | |
9782 | if Is_Access_Type (Desig) then | |
9783 | Desig := Directly_Designated_Type (Desig); | |
9784 | end if; | |
9785 | ||
9786 | if Is_Class_Wide_Type (Desig) then | |
9787 | Desig := Root_Type (Desig); | |
9788 | end if; | |
9789 | ||
9790 | return | |
7b56a91b AC |
9791 | Ekind (Desig) = E_Incomplete_Type |
9792 | and then From_Limited_With (Desig); | |
9793 | end Designates_From_Limited_With; | |
950d217a | 9794 | |
07fc65c4 GB |
9795 | --------------------------- |
9796 | -- Is_Class_Wide_Default -- | |
9797 | --------------------------- | |
9798 | ||
9799 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
9800 | begin | |
9801 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
9802 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
9803 | and then Attribute_Name (D) = Name_Access |
9804 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
9805 | end Is_Class_Wide_Default; |
9806 | ||
9807 | -- Start of processing for Process_Formals | |
9808 | ||
996ae0b0 RK |
9809 | begin |
9810 | -- In order to prevent premature use of the formals in the same formal | |
9811 | -- part, the Ekind is left undefined until all default expressions are | |
9812 | -- analyzed. The Ekind is established in a separate loop at the end. | |
9813 | ||
9814 | Param_Spec := First (T); | |
996ae0b0 | 9815 | while Present (Param_Spec) loop |
996ae0b0 | 9816 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 9817 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
9818 | Enter_Name (Formal); |
9819 | ||
9820 | -- Case of ordinary parameters | |
9821 | ||
9822 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
9823 | Find_Type (Parameter_Type (Param_Spec)); | |
9824 | Ptype := Parameter_Type (Param_Spec); | |
9825 | ||
9826 | if Ptype = Error then | |
9827 | goto Continue; | |
9828 | end if; | |
9829 | ||
9830 | Formal_Type := Entity (Ptype); | |
9831 | ||
ec4867fa ES |
9832 | if Is_Incomplete_Type (Formal_Type) |
9833 | or else | |
9834 | (Is_Class_Wide_Type (Formal_Type) | |
8fde064e | 9835 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
996ae0b0 | 9836 | then |
93bcda23 AC |
9837 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
9838 | -- primitive operations, as long as their completion is | |
9839 | -- in the same declarative part. If in the private part | |
9840 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
9841 | -- Check is done on package exit. For access to subprograms, |
9842 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 9843 | |
6eddd7b4 AC |
9844 | -- Ada 2012: tagged incomplete types are allowed as generic |
9845 | -- formal types. They do not introduce dependencies and the | |
9846 | -- corresponding generic subprogram does not have a delayed | |
5b6f12c7 AC |
9847 | -- freeze, because it does not need a freeze node. However, |
9848 | -- it is still the case that untagged incomplete types cannot | |
9849 | -- be Taft-amendment types and must be completed in private | |
9850 | -- part, so the subprogram must appear in the list of private | |
9851 | -- dependents of the type. | |
9852 | ||
9853 | if Is_Tagged_Type (Formal_Type) | |
b973629e | 9854 | or else (Ada_Version >= Ada_2012 |
1ebc2612 AC |
9855 | and then not From_Limited_With (Formal_Type) |
9856 | and then not Is_Generic_Type (Formal_Type)) | |
5b6f12c7 | 9857 | then |
93bcda23 | 9858 | if Ekind (Scope (Current_Scope)) = E_Package |
6eddd7b4 | 9859 | and then not Is_Generic_Type (Formal_Type) |
93bcda23 AC |
9860 | and then not Is_Class_Wide_Type (Formal_Type) |
9861 | then | |
cec29135 ES |
9862 | if not Nkind_In |
9863 | (Parent (T), N_Access_Function_Definition, | |
9864 | N_Access_Procedure_Definition) | |
9865 | then | |
9866 | Append_Elmt | |
9867 | (Current_Scope, | |
9868 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
9869 | |
9870 | -- Freezing is delayed to ensure that Register_Prim | |
9871 | -- will get called for this operation, which is needed | |
9872 | -- in cases where static dispatch tables aren't built. | |
9873 | -- (Note that the same is done for controlling access | |
9874 | -- parameter cases in function Access_Definition.) | |
9875 | ||
9876 | Set_Has_Delayed_Freeze (Current_Scope); | |
cec29135 | 9877 | end if; |
93bcda23 | 9878 | end if; |
fbf5a39b | 9879 | |
0a36105d JM |
9880 | -- Special handling of Value_Type for CIL case |
9881 | ||
9882 | elsif Is_Value_Type (Formal_Type) then | |
9883 | null; | |
9884 | ||
800621e0 RD |
9885 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
9886 | N_Access_Procedure_Definition) | |
996ae0b0 | 9887 | then |
dd386db0 AC |
9888 | -- AI05-0151: Tagged incomplete types are allowed in all |
9889 | -- formal parts. Untagged incomplete types are not allowed | |
b973629e AC |
9890 | -- in bodies. Limited views of either kind are not allowed |
9891 | -- if there is no place at which the non-limited view can | |
9892 | -- become available. | |
a18e3d62 | 9893 | |
1ebc2612 AC |
9894 | -- Incomplete formal untagged types are not allowed in |
9895 | -- subprogram bodies (but are legal in their declarations). | |
9896 | ||
9897 | if Is_Generic_Type (Formal_Type) | |
9898 | and then not Is_Tagged_Type (Formal_Type) | |
9899 | and then Nkind (Parent (Related_Nod)) = N_Subprogram_Body | |
9900 | then | |
9901 | Error_Msg_N | |
9902 | ("invalid use of formal incomplete type", Param_Spec); | |
dd386db0 | 9903 | |
1ebc2612 | 9904 | elsif Ada_Version >= Ada_2012 then |
b973629e AC |
9905 | if Is_Tagged_Type (Formal_Type) |
9906 | and then (not From_Limited_With (Formal_Type) | |
9907 | or else not In_Package_Body) | |
9908 | then | |
dd386db0 AC |
9909 | null; |
9910 | ||
0f1a6a0b | 9911 | elsif Nkind_In (Parent (Parent (T)), N_Accept_Statement, |
b973629e | 9912 | N_Accept_Alternative, |
0f1a6a0b AC |
9913 | N_Entry_Body, |
9914 | N_Subprogram_Body) | |
dd386db0 AC |
9915 | then |
9916 | Error_Msg_NE | |
9917 | ("invalid use of untagged incomplete type&", | |
0f1a6a0b | 9918 | Ptype, Formal_Type); |
dd386db0 AC |
9919 | end if; |
9920 | ||
9921 | else | |
9922 | Error_Msg_NE | |
9923 | ("invalid use of incomplete type&", | |
0f1a6a0b | 9924 | Param_Spec, Formal_Type); |
dd386db0 AC |
9925 | |
9926 | -- Further checks on the legality of incomplete types | |
9927 | -- in formal parts are delayed until the freeze point | |
9928 | -- of the enclosing subprogram or access to subprogram. | |
9929 | end if; | |
996ae0b0 RK |
9930 | end if; |
9931 | ||
9932 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
9933 | Error_Msg_NE |
9934 | ("premature use of&", | |
9935 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
9936 | end if; |
9937 | ||
fecbd779 AC |
9938 | -- Ada 2012 (AI-142): Handle aliased parameters |
9939 | ||
9940 | if Ada_Version >= Ada_2012 | |
9941 | and then Aliased_Present (Param_Spec) | |
9942 | then | |
9943 | Set_Is_Aliased (Formal); | |
9944 | end if; | |
9945 | ||
0ab80019 | 9946 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 9947 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
9948 | -- formal in the enclosing scope. Finally, replace the parameter |
9949 | -- type of the formal with the internal subtype. | |
7324bf49 | 9950 | |
0791fbe9 | 9951 | if Ada_Version >= Ada_2005 |
41251c60 | 9952 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 9953 | then |
ec4867fa | 9954 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 9955 | Error_Msg_N |
0a36105d JM |
9956 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
9957 | ||
ec4867fa ES |
9958 | else |
9959 | if Can_Never_Be_Null (Formal_Type) | |
9960 | and then Comes_From_Source (Related_Nod) | |
9961 | then | |
ed2233dc | 9962 | Error_Msg_NE |
0a36105d | 9963 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 9964 | Param_Spec, Formal_Type); |
ec4867fa | 9965 | end if; |
41251c60 | 9966 | |
ec4867fa ES |
9967 | Formal_Type := |
9968 | Create_Null_Excluding_Itype | |
9969 | (T => Formal_Type, | |
9970 | Related_Nod => Related_Nod, | |
9971 | Scope_Id => Scope (Current_Scope)); | |
0a36105d | 9972 | |
fcf848c4 AC |
9973 | -- If the designated type of the itype is an itype that is |
9974 | -- not frozen yet, we set the Has_Delayed_Freeze attribute | |
9975 | -- on the access subtype, to prevent order-of-elaboration | |
9976 | -- issues in the backend. | |
0a36105d JM |
9977 | |
9978 | -- Example: | |
9979 | -- type T is access procedure; | |
9980 | -- procedure Op (O : not null T); | |
9981 | ||
fcf848c4 AC |
9982 | if Is_Itype (Directly_Designated_Type (Formal_Type)) |
9983 | and then | |
9984 | not Is_Frozen (Directly_Designated_Type (Formal_Type)) | |
9985 | then | |
0a36105d JM |
9986 | Set_Has_Delayed_Freeze (Formal_Type); |
9987 | end if; | |
ec4867fa | 9988 | end if; |
7324bf49 AC |
9989 | end if; |
9990 | ||
996ae0b0 RK |
9991 | -- An access formal type |
9992 | ||
9993 | else | |
9994 | Formal_Type := | |
9995 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 9996 | |
f937473f RD |
9997 | -- No need to continue if we already notified errors |
9998 | ||
9999 | if not Present (Formal_Type) then | |
10000 | return; | |
10001 | end if; | |
10002 | ||
0ab80019 | 10003 | -- Ada 2005 (AI-254) |
7324bf49 | 10004 | |
af4b9434 AC |
10005 | declare |
10006 | AD : constant Node_Id := | |
10007 | Access_To_Subprogram_Definition | |
10008 | (Parameter_Type (Param_Spec)); | |
10009 | begin | |
10010 | if Present (AD) and then Protected_Present (AD) then | |
10011 | Formal_Type := | |
10012 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 10013 | (Param_Spec); |
af4b9434 AC |
10014 | end if; |
10015 | end; | |
996ae0b0 RK |
10016 | end if; |
10017 | ||
10018 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 10019 | |
fecbd779 AC |
10020 | -- Deal with default expression if present |
10021 | ||
fbf5a39b | 10022 | Default := Expression (Param_Spec); |
996ae0b0 RK |
10023 | |
10024 | if Present (Default) then | |
2ba431e5 | 10025 | Check_SPARK_Restriction |
fe5d3068 | 10026 | ("default expression is not allowed", Default); |
38171f43 | 10027 | |
996ae0b0 | 10028 | if Out_Present (Param_Spec) then |
ed2233dc | 10029 | Error_Msg_N |
996ae0b0 RK |
10030 | ("default initialization only allowed for IN parameters", |
10031 | Param_Spec); | |
10032 | end if; | |
10033 | ||
10034 | -- Do the special preanalysis of the expression (see section on | |
10035 | -- "Handling of Default Expressions" in the spec of package Sem). | |
10036 | ||
21d27997 | 10037 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 10038 | |
f29b857f ES |
10039 | -- An access to constant cannot be the default for |
10040 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
10041 | |
10042 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
10043 | and then not Is_Access_Constant (Formal_Type) | |
10044 | and then Is_Access_Type (Etype (Default)) | |
10045 | and then Is_Access_Constant (Etype (Default)) | |
10046 | then | |
f29b857f | 10047 | Error_Msg_N |
84c0a895 AC |
10048 | ("formal that is access to variable cannot be initialized " |
10049 | & "with an access-to-constant expression", Default); | |
2eb160f2 ST |
10050 | end if; |
10051 | ||
d8db0bca JM |
10052 | -- Check that the designated type of an access parameter's default |
10053 | -- is not a class-wide type unless the parameter's designated type | |
10054 | -- is also class-wide. | |
996ae0b0 RK |
10055 | |
10056 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
7b56a91b | 10057 | and then not Designates_From_Limited_With (Formal_Type) |
07fc65c4 | 10058 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
10059 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
10060 | then | |
07fc65c4 GB |
10061 | Error_Msg_N |
10062 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 10063 | end if; |
4755cce9 JM |
10064 | |
10065 | -- Check incorrect use of dynamically tagged expressions | |
10066 | ||
10067 | if Is_Tagged_Type (Formal_Type) then | |
10068 | Check_Dynamically_Tagged_Expression | |
10069 | (Expr => Default, | |
10070 | Typ => Formal_Type, | |
10071 | Related_Nod => Default); | |
10072 | end if; | |
996ae0b0 RK |
10073 | end if; |
10074 | ||
41251c60 JM |
10075 | -- Ada 2005 (AI-231): Static checks |
10076 | ||
0791fbe9 | 10077 | if Ada_Version >= Ada_2005 |
41251c60 JM |
10078 | and then Is_Access_Type (Etype (Formal)) |
10079 | and then Can_Never_Be_Null (Etype (Formal)) | |
10080 | then | |
10081 | Null_Exclusion_Static_Checks (Param_Spec); | |
10082 | end if; | |
10083 | ||
f1bd0415 AC |
10084 | -- The following checks are relevant when SPARK_Mode is on as these |
10085 | -- are not standard Ada legality rules. | |
6c3c671e | 10086 | |
ea26c8e4 HK |
10087 | if SPARK_Mode = On then |
10088 | if Ekind_In (Scope (Formal), E_Function, E_Generic_Function) then | |
f1bd0415 | 10089 | |
ea26c8e4 HK |
10090 | -- A function cannot have a parameter of mode IN OUT or OUT |
10091 | -- (SPARK RM 6.1). | |
f1bd0415 | 10092 | |
ea26c8e4 HK |
10093 | if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then |
10094 | Error_Msg_N | |
10095 | ("function cannot have parameter of mode `OUT` or " | |
10096 | & "`IN OUT`", Formal); | |
f1bd0415 | 10097 | |
ea26c8e4 HK |
10098 | -- A function cannot have a volatile formal parameter |
10099 | -- (SPARK RM 7.1.3(10)). | |
10100 | ||
10101 | elsif Is_SPARK_Volatile (Formal) then | |
10102 | Error_Msg_N | |
10103 | ("function cannot have a volatile formal parameter", | |
10104 | Formal); | |
10105 | end if; | |
10106 | ||
10107 | -- A procedure cannot have a formal parameter of mode IN because | |
10108 | -- it behaves as a constant (SPARK RM 7.1.3(6)). | |
10109 | ||
10110 | elsif Ekind (Scope (Formal)) = E_Procedure | |
10111 | and then Ekind (Formal) = E_In_Parameter | |
10112 | and then Is_SPARK_Volatile (Formal) | |
10113 | then | |
f1bd0415 | 10114 | Error_Msg_N |
ea26c8e4 | 10115 | ("formal parameter of mode `IN` cannot be volatile", Formal); |
f1bd0415 | 10116 | end if; |
6c3c671e AC |
10117 | end if; |
10118 | ||
996ae0b0 RK |
10119 | <<Continue>> |
10120 | Next (Param_Spec); | |
10121 | end loop; | |
10122 | ||
82c80734 RD |
10123 | -- If this is the formal part of a function specification, analyze the |
10124 | -- subtype mark in the context where the formals are visible but not | |
10125 | -- yet usable, and may hide outer homographs. | |
10126 | ||
10127 | if Nkind (Related_Nod) = N_Function_Specification then | |
10128 | Analyze_Return_Type (Related_Nod); | |
10129 | end if; | |
10130 | ||
996ae0b0 RK |
10131 | -- Now set the kind (mode) of each formal |
10132 | ||
10133 | Param_Spec := First (T); | |
996ae0b0 RK |
10134 | while Present (Param_Spec) loop |
10135 | Formal := Defining_Identifier (Param_Spec); | |
10136 | Set_Formal_Mode (Formal); | |
10137 | ||
10138 | if Ekind (Formal) = E_In_Parameter then | |
10139 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
10140 | ||
10141 | if Present (Expression (Param_Spec)) then | |
10142 | Default := Expression (Param_Spec); | |
10143 | ||
10144 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
10145 | if Nkind (Parameter_Type (Param_Spec)) /= |
10146 | N_Access_Definition | |
996ae0b0 RK |
10147 | then |
10148 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 10149 | else |
5ebfaacf AC |
10150 | Formal_Type := |
10151 | Access_Definition | |
10152 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
10153 | end if; |
10154 | ||
10155 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
10156 | end if; | |
2820d220 | 10157 | end if; |
800621e0 RD |
10158 | |
10159 | elsif Ekind (Formal) = E_Out_Parameter then | |
10160 | Num_Out_Params := Num_Out_Params + 1; | |
10161 | ||
10162 | if Num_Out_Params = 1 then | |
10163 | First_Out_Param := Formal; | |
10164 | end if; | |
10165 | ||
10166 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
10167 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
10168 | end if; |
10169 | ||
4172a8e3 AC |
10170 | -- Skip remaining processing if formal type was in error |
10171 | ||
10172 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
10173 | goto Next_Parameter; | |
10174 | end if; | |
10175 | ||
fecbd779 AC |
10176 | -- Force call by reference if aliased |
10177 | ||
10178 | if Is_Aliased (Formal) then | |
10179 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf AC |
10180 | |
10181 | -- Warn if user asked this to be passed by copy | |
10182 | ||
10183 | if Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10184 | Error_Msg_N | |
b785e0b8 | 10185 | ("cannot pass aliased parameter & by copy??", Formal); |
5ebfaacf AC |
10186 | end if; |
10187 | ||
10188 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy | |
10189 | ||
10190 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10191 | Set_Mechanism (Formal, By_Copy); | |
10192 | ||
10193 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Reference then | |
10194 | Set_Mechanism (Formal, By_Reference); | |
fecbd779 AC |
10195 | end if; |
10196 | ||
4172a8e3 | 10197 | <<Next_Parameter>> |
996ae0b0 RK |
10198 | Next (Param_Spec); |
10199 | end loop; | |
800621e0 RD |
10200 | |
10201 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
10202 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
10203 | end if; | |
996ae0b0 RK |
10204 | end Process_Formals; |
10205 | ||
fbf5a39b AC |
10206 | ---------------------------- |
10207 | -- Reference_Body_Formals -- | |
10208 | ---------------------------- | |
10209 | ||
10210 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
10211 | Fs : Entity_Id; | |
10212 | Fb : Entity_Id; | |
10213 | ||
10214 | begin | |
10215 | if Error_Posted (Spec) then | |
10216 | return; | |
10217 | end if; | |
10218 | ||
0a36105d JM |
10219 | -- Iterate over both lists. They may be of different lengths if the two |
10220 | -- specs are not conformant. | |
10221 | ||
fbf5a39b AC |
10222 | Fs := First_Formal (Spec); |
10223 | Fb := First_Formal (Bod); | |
0a36105d | 10224 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
10225 | Generate_Reference (Fs, Fb, 'b'); |
10226 | ||
10227 | if Style_Check then | |
10228 | Style.Check_Identifier (Fb, Fs); | |
10229 | end if; | |
10230 | ||
10231 | Set_Spec_Entity (Fb, Fs); | |
10232 | Set_Referenced (Fs, False); | |
10233 | Next_Formal (Fs); | |
10234 | Next_Formal (Fb); | |
10235 | end loop; | |
10236 | end Reference_Body_Formals; | |
10237 | ||
996ae0b0 RK |
10238 | ------------------------- |
10239 | -- Set_Actual_Subtypes -- | |
10240 | ------------------------- | |
10241 | ||
10242 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
84c0a895 AC |
10243 | Decl : Node_Id; |
10244 | Formal : Entity_Id; | |
10245 | T : Entity_Id; | |
10246 | First_Stmt : Node_Id := Empty; | |
10247 | AS_Needed : Boolean; | |
996ae0b0 RK |
10248 | |
10249 | begin | |
f3d57416 | 10250 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
10251 | -- actual subtypes (small optimization). |
10252 | ||
8fde064e | 10253 | if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
fbf5a39b AC |
10254 | return; |
10255 | end if; | |
10256 | ||
996ae0b0 RK |
10257 | Formal := First_Formal (Subp); |
10258 | while Present (Formal) loop | |
10259 | T := Etype (Formal); | |
10260 | ||
e895b435 | 10261 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
10262 | |
10263 | if Is_Constrained (T) then | |
10264 | AS_Needed := False; | |
10265 | ||
82c80734 | 10266 | -- If we have unknown discriminants, then we do not need an actual |
a90bd866 | 10267 | -- subtype, or more accurately we cannot figure it out. Note that |
82c80734 | 10268 | -- all class-wide types have unknown discriminants. |
996ae0b0 RK |
10269 | |
10270 | elsif Has_Unknown_Discriminants (T) then | |
10271 | AS_Needed := False; | |
10272 | ||
82c80734 RD |
10273 | -- At this stage we have an unconstrained type that may need an |
10274 | -- actual subtype. For sure the actual subtype is needed if we have | |
10275 | -- an unconstrained array type. | |
996ae0b0 RK |
10276 | |
10277 | elsif Is_Array_Type (T) then | |
10278 | AS_Needed := True; | |
10279 | ||
d8db0bca JM |
10280 | -- The only other case needing an actual subtype is an unconstrained |
10281 | -- record type which is an IN parameter (we cannot generate actual | |
10282 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
10283 | -- change the discriminant values. However we exclude the case of | |
10284 | -- initialization procedures, since discriminants are handled very | |
10285 | -- specially in this context, see the section entitled "Handling of | |
10286 | -- Discriminants" in Einfo. | |
10287 | ||
10288 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
10289 | -- in front end layout mode for size/offset values), since in such | |
10290 | -- functions only discriminants are referenced, and not only are such | |
10291 | -- subtypes not needed, but they cannot always be generated, because | |
10292 | -- of order of elaboration issues. | |
996ae0b0 RK |
10293 | |
10294 | elsif Is_Record_Type (T) | |
10295 | and then Ekind (Formal) = E_In_Parameter | |
10296 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 10297 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
10298 | and then not Is_Discrim_SO_Function (Subp) |
10299 | then | |
10300 | AS_Needed := True; | |
10301 | ||
10302 | -- All other cases do not need an actual subtype | |
10303 | ||
10304 | else | |
10305 | AS_Needed := False; | |
10306 | end if; | |
10307 | ||
10308 | -- Generate actual subtypes for unconstrained arrays and | |
10309 | -- unconstrained discriminated records. | |
10310 | ||
10311 | if AS_Needed then | |
7324bf49 | 10312 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 10313 | |
57a8057a | 10314 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
10315 | -- variable that renames the corresponding entry of the |
10316 | -- parameter block, and it is this local variable that may | |
da94696d | 10317 | -- require an actual subtype. |
fbf5a39b | 10318 | |
4460a9bc | 10319 | if Expander_Active then |
fbf5a39b AC |
10320 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
10321 | else | |
10322 | Decl := Build_Actual_Subtype (T, Formal); | |
10323 | end if; | |
10324 | ||
996ae0b0 RK |
10325 | if Present (Handled_Statement_Sequence (N)) then |
10326 | First_Stmt := | |
10327 | First (Statements (Handled_Statement_Sequence (N))); | |
10328 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
10329 | Mark_Rewrite_Insertion (Decl); | |
10330 | else | |
82c80734 RD |
10331 | -- If the accept statement has no body, there will be no |
10332 | -- reference to the actuals, so no need to compute actual | |
10333 | -- subtypes. | |
996ae0b0 RK |
10334 | |
10335 | return; | |
10336 | end if; | |
10337 | ||
10338 | else | |
fbf5a39b | 10339 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
10340 | Prepend (Decl, Declarations (N)); |
10341 | Mark_Rewrite_Insertion (Decl); | |
10342 | end if; | |
10343 | ||
82c80734 RD |
10344 | -- The declaration uses the bounds of an existing object, and |
10345 | -- therefore needs no constraint checks. | |
2820d220 | 10346 | |
7324bf49 | 10347 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 10348 | |
996ae0b0 RK |
10349 | -- We need to freeze manually the generated type when it is |
10350 | -- inserted anywhere else than in a declarative part. | |
10351 | ||
10352 | if Present (First_Stmt) then | |
10353 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 10354 | Freeze_Entity (Defining_Identifier (Decl), N)); |
fcadacf7 ES |
10355 | |
10356 | -- Ditto if the type has a dynamic predicate, because the | |
10357 | -- generated function will mention the actual subtype. | |
10358 | ||
10359 | elsif Has_Dynamic_Predicate_Aspect (T) then | |
10360 | Insert_List_Before_And_Analyze (Decl, | |
10361 | Freeze_Entity (Defining_Identifier (Decl), N)); | |
996ae0b0 RK |
10362 | end if; |
10363 | ||
fbf5a39b | 10364 | if Nkind (N) = N_Accept_Statement |
4460a9bc | 10365 | and then Expander_Active |
fbf5a39b AC |
10366 | then |
10367 | Set_Actual_Subtype (Renamed_Object (Formal), | |
10368 | Defining_Identifier (Decl)); | |
10369 | else | |
10370 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
10371 | end if; | |
996ae0b0 RK |
10372 | end if; |
10373 | ||
10374 | Next_Formal (Formal); | |
10375 | end loop; | |
10376 | end Set_Actual_Subtypes; | |
10377 | ||
10378 | --------------------- | |
10379 | -- Set_Formal_Mode -- | |
10380 | --------------------- | |
10381 | ||
10382 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
10383 | Spec : constant Node_Id := Parent (Formal_Id); | |
10384 | ||
10385 | begin | |
10386 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
10387 | -- since we ensure that corresponding actuals are always valid at the | |
10388 | -- point of the call. | |
10389 | ||
10390 | if Out_Present (Spec) then | |
fc999c5d RD |
10391 | if Ekind_In (Scope (Formal_Id), E_Function, E_Generic_Function) then |
10392 | ||
b4ca2d2c | 10393 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
10394 | |
10395 | if Ada_Version >= Ada_2012 then | |
e6425869 AC |
10396 | |
10397 | -- Even in Ada 2012 operators can only have IN parameters | |
10398 | ||
10399 | if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then | |
10400 | Error_Msg_N ("operators can only have IN parameters", Spec); | |
10401 | end if; | |
10402 | ||
c56a9ba4 AC |
10403 | if In_Present (Spec) then |
10404 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10405 | else | |
10406 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
10407 | end if; | |
10408 | ||
fc999c5d RD |
10409 | Set_Has_Out_Or_In_Out_Parameter (Scope (Formal_Id), True); |
10410 | ||
b4ca2d2c AC |
10411 | -- But not in earlier versions of Ada |
10412 | ||
c56a9ba4 AC |
10413 | else |
10414 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
10415 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10416 | end if; | |
996ae0b0 RK |
10417 | |
10418 | elsif In_Present (Spec) then | |
10419 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10420 | ||
10421 | else | |
fbf5a39b AC |
10422 | Set_Ekind (Formal_Id, E_Out_Parameter); |
10423 | Set_Never_Set_In_Source (Formal_Id, True); | |
10424 | Set_Is_True_Constant (Formal_Id, False); | |
10425 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
10426 | end if; |
10427 | ||
10428 | else | |
10429 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10430 | end if; | |
10431 | ||
fbf5a39b | 10432 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
10433 | -- guarantees that access parameters are always non-null. We also set |
10434 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
10435 | |
10436 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 10437 | |
885c4871 | 10438 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 10439 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 10440 | |
0791fbe9 | 10441 | if Ada_Version < Ada_2005 |
2813bb6b | 10442 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
10443 | then |
10444 | Set_Is_Known_Non_Null (Formal_Id); | |
10445 | Set_Can_Never_Be_Null (Formal_Id); | |
10446 | end if; | |
2813bb6b | 10447 | |
41251c60 JM |
10448 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
10449 | ||
2813bb6b ES |
10450 | elsif Is_Access_Type (Etype (Formal_Id)) |
10451 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
10452 | then | |
2813bb6b | 10453 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
10454 | |
10455 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
10456 | -- access checks) for the case of an IN parameter, which cannot | |
10457 | -- be changed, or for an IN OUT parameter, which can be changed but | |
10458 | -- not to a null value. But for an OUT parameter, the initial value | |
10459 | -- passed in can be null, so we can't set this flag in that case. | |
10460 | ||
10461 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
10462 | Set_Can_Never_Be_Null (Formal_Id); | |
10463 | end if; | |
fbf5a39b AC |
10464 | end if; |
10465 | ||
996ae0b0 RK |
10466 | Set_Mechanism (Formal_Id, Default_Mechanism); |
10467 | Set_Formal_Validity (Formal_Id); | |
10468 | end Set_Formal_Mode; | |
10469 | ||
10470 | ------------------------- | |
10471 | -- Set_Formal_Validity -- | |
10472 | ------------------------- | |
10473 | ||
10474 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
10475 | begin | |
82c80734 RD |
10476 | -- If no validity checking, then we cannot assume anything about the |
10477 | -- validity of parameters, since we do not know there is any checking | |
10478 | -- of the validity on the call side. | |
996ae0b0 RK |
10479 | |
10480 | if not Validity_Checks_On then | |
10481 | return; | |
10482 | ||
fbf5a39b AC |
10483 | -- If validity checking for parameters is enabled, this means we are |
10484 | -- not supposed to make any assumptions about argument values. | |
10485 | ||
10486 | elsif Validity_Check_Parameters then | |
10487 | return; | |
10488 | ||
10489 | -- If we are checking in parameters, we will assume that the caller is | |
10490 | -- also checking parameters, so we can assume the parameter is valid. | |
10491 | ||
996ae0b0 RK |
10492 | elsif Ekind (Formal_Id) = E_In_Parameter |
10493 | and then Validity_Check_In_Params | |
10494 | then | |
10495 | Set_Is_Known_Valid (Formal_Id, True); | |
10496 | ||
fbf5a39b AC |
10497 | -- Similar treatment for IN OUT parameters |
10498 | ||
996ae0b0 RK |
10499 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
10500 | and then Validity_Check_In_Out_Params | |
10501 | then | |
10502 | Set_Is_Known_Valid (Formal_Id, True); | |
10503 | end if; | |
10504 | end Set_Formal_Validity; | |
10505 | ||
10506 | ------------------------ | |
10507 | -- Subtype_Conformant -- | |
10508 | ------------------------ | |
10509 | ||
ce2b6ba5 JM |
10510 | function Subtype_Conformant |
10511 | (New_Id : Entity_Id; | |
10512 | Old_Id : Entity_Id; | |
10513 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10514 | is | |
996ae0b0 | 10515 | Result : Boolean; |
996ae0b0 | 10516 | begin |
ce2b6ba5 JM |
10517 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
10518 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10519 | return Result; |
10520 | end Subtype_Conformant; | |
10521 | ||
10522 | --------------------- | |
10523 | -- Type_Conformant -- | |
10524 | --------------------- | |
10525 | ||
41251c60 JM |
10526 | function Type_Conformant |
10527 | (New_Id : Entity_Id; | |
10528 | Old_Id : Entity_Id; | |
10529 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10530 | is | |
996ae0b0 | 10531 | Result : Boolean; |
996ae0b0 | 10532 | begin |
c8ef728f | 10533 | May_Hide_Profile := False; |
41251c60 JM |
10534 | Check_Conformance |
10535 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
10536 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10537 | return Result; |
10538 | end Type_Conformant; | |
10539 | ||
10540 | ------------------------------- | |
10541 | -- Valid_Operator_Definition -- | |
10542 | ------------------------------- | |
10543 | ||
10544 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
10545 | N : Integer := 0; | |
10546 | F : Entity_Id; | |
10547 | Id : constant Name_Id := Chars (Designator); | |
10548 | N_OK : Boolean; | |
10549 | ||
10550 | begin | |
10551 | F := First_Formal (Designator); | |
996ae0b0 RK |
10552 | while Present (F) loop |
10553 | N := N + 1; | |
10554 | ||
10555 | if Present (Default_Value (F)) then | |
ed2233dc | 10556 | Error_Msg_N |
996ae0b0 RK |
10557 | ("default values not allowed for operator parameters", |
10558 | Parent (F)); | |
220d1fd9 AC |
10559 | |
10560 | -- For function instantiations that are operators, we must check | |
10561 | -- separately that the corresponding generic only has in-parameters. | |
84c0a895 AC |
10562 | -- For subprogram declarations this is done in Set_Formal_Mode. Such |
10563 | -- an error could not arise in earlier versions of the language. | |
220d1fd9 AC |
10564 | |
10565 | elsif Ekind (F) /= E_In_Parameter then | |
84c0a895 | 10566 | Error_Msg_N ("operators can only have IN parameters", F); |
996ae0b0 RK |
10567 | end if; |
10568 | ||
10569 | Next_Formal (F); | |
10570 | end loop; | |
10571 | ||
10572 | -- Verify that user-defined operators have proper number of arguments | |
10573 | -- First case of operators which can only be unary | |
10574 | ||
b69cd36a | 10575 | if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
996ae0b0 RK |
10576 | N_OK := (N = 1); |
10577 | ||
10578 | -- Case of operators which can be unary or binary | |
10579 | ||
b69cd36a | 10580 | elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
10581 | N_OK := (N in 1 .. 2); |
10582 | ||
10583 | -- All other operators can only be binary | |
10584 | ||
10585 | else | |
10586 | N_OK := (N = 2); | |
10587 | end if; | |
10588 | ||
10589 | if not N_OK then | |
10590 | Error_Msg_N | |
10591 | ("incorrect number of arguments for operator", Designator); | |
10592 | end if; | |
10593 | ||
10594 | if Id = Name_Op_Ne | |
10595 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
10596 | and then not Is_Intrinsic_Subprogram (Designator) | |
10597 | then | |
10598 | Error_Msg_N | |
84c0a895 | 10599 | ("explicit definition of inequality not allowed", Designator); |
996ae0b0 RK |
10600 | end if; |
10601 | end Valid_Operator_Definition; | |
10602 | ||
10603 | end Sem_Ch6; |