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996ae0b0 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M _ C H 6 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
996ae0b0 | 8 | -- -- |
2c6336be | 9 | -- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- |
996ae0b0 RK |
10 | -- -- |
11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
996ae0b0 RK |
14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
17 | -- for more details. You should have received a copy of the GNU General -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
996ae0b0 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
996ae0b0 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
80e59506 | 26 | with Aspects; use Aspects; |
996ae0b0 RK |
27 | with Atree; use Atree; |
28 | with Checks; use Checks; | |
29 | with Debug; use Debug; | |
30 | with Einfo; use Einfo; | |
31 | with Elists; use Elists; | |
32 | with Errout; use Errout; | |
33 | with Expander; use Expander; | |
ec4867fa | 34 | with Exp_Ch6; use Exp_Ch6; |
996ae0b0 | 35 | with Exp_Ch7; use Exp_Ch7; |
21d27997 | 36 | with Exp_Ch9; use Exp_Ch9; |
616547fa | 37 | with Exp_Dbug; use Exp_Dbug; |
ce2b6ba5 | 38 | with Exp_Disp; use Exp_Disp; |
e660dbf7 | 39 | with Exp_Tss; use Exp_Tss; |
ec4867fa | 40 | with Exp_Util; use Exp_Util; |
fbf5a39b | 41 | with Fname; use Fname; |
996ae0b0 | 42 | with Freeze; use Freeze; |
8636f52f | 43 | with Ghost; use Ghost; |
540d8610 | 44 | with Inline; use Inline; |
41251c60 | 45 | with Itypes; use Itypes; |
996ae0b0 | 46 | with Lib.Xref; use Lib.Xref; |
ec4867fa | 47 | with Layout; use Layout; |
996ae0b0 RK |
48 | with Namet; use Namet; |
49 | with Lib; use Lib; | |
50 | with Nlists; use Nlists; | |
51 | with Nmake; use Nmake; | |
52 | with Opt; use Opt; | |
53 | with Output; use Output; | |
b20de9b9 AC |
54 | with Restrict; use Restrict; |
55 | with Rident; use Rident; | |
996ae0b0 RK |
56 | with Rtsfind; use Rtsfind; |
57 | with Sem; use Sem; | |
a4100e55 | 58 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
59 | with Sem_Cat; use Sem_Cat; |
60 | with Sem_Ch3; use Sem_Ch3; | |
61 | with Sem_Ch4; use Sem_Ch4; | |
62 | with Sem_Ch5; use Sem_Ch5; | |
63 | with Sem_Ch8; use Sem_Ch8; | |
9bc856dd | 64 | with Sem_Ch10; use Sem_Ch10; |
996ae0b0 | 65 | with Sem_Ch12; use Sem_Ch12; |
0f1a6a0b | 66 | with Sem_Ch13; use Sem_Ch13; |
dec6faf1 | 67 | with Sem_Dim; use Sem_Dim; |
996ae0b0 RK |
68 | with Sem_Disp; use Sem_Disp; |
69 | with Sem_Dist; use Sem_Dist; | |
70 | with Sem_Elim; use Sem_Elim; | |
71 | with Sem_Eval; use Sem_Eval; | |
72 | with Sem_Mech; use Sem_Mech; | |
73 | with Sem_Prag; use Sem_Prag; | |
74 | with Sem_Res; use Sem_Res; | |
75 | with Sem_Util; use Sem_Util; | |
76 | with Sem_Type; use Sem_Type; | |
77 | with Sem_Warn; use Sem_Warn; | |
78 | with Sinput; use Sinput; | |
79 | with Stand; use Stand; | |
80 | with Sinfo; use Sinfo; | |
81 | with Sinfo.CN; use Sinfo.CN; | |
82 | with Snames; use Snames; | |
83 | with Stringt; use Stringt; | |
84 | with Style; | |
85 | with Stylesw; use Stylesw; | |
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 | ||
c9d70ab1 AC |
106 | procedure Analyze_Function_Return (N : Node_Id); |
107 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement | |
108 | -- applies to a [generic] function. | |
109 | ||
110 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); | |
111 | -- Analyze a generic subprogram body. N is the body to be analyzed, and | |
112 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
113 | ||
4d8f3296 ES |
114 | procedure Analyze_Null_Procedure |
115 | (N : Node_Id; | |
116 | Is_Completion : out Boolean); | |
9d2a2071 | 117 | -- A null procedure can be a declaration or (Ada 2012) a completion |
4d8f3296 | 118 | |
5d37ba92 | 119 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 120 | -- Common processing for simple and extended return statements |
ec4867fa | 121 | |
82c80734 RD |
122 | procedure Analyze_Return_Type (N : Node_Id); |
123 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 124 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
125 | -- outer homographs. |
126 | ||
b1b543d2 | 127 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
128 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
129 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 130 | |
806f6d37 AC |
131 | function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
132 | -- Returns true if Subp can override a predefined operator. | |
133 | ||
996ae0b0 | 134 | procedure Check_Conformance |
41251c60 JM |
135 | (New_Id : Entity_Id; |
136 | Old_Id : Entity_Id; | |
137 | Ctype : Conformance_Type; | |
138 | Errmsg : Boolean; | |
139 | Conforms : out Boolean; | |
140 | Err_Loc : Node_Id := Empty; | |
141 | Get_Inst : Boolean := False; | |
142 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
143 | -- Given two entities, this procedure checks that the profiles associated |
144 | -- with these entities meet the conformance criterion given by the third | |
145 | -- parameter. If they conform, Conforms is set True and control returns | |
146 | -- to the caller. If they do not conform, Conforms is set to False, and | |
147 | -- in addition, if Errmsg is True on the call, proper messages are output | |
148 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
149 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
150 | -- error messages are placed on the appropriate part of the construct | |
151 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
152 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
153 | -- be called. | |
154 | ||
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 | |
1af4455a HK |
211 | Scop : constant Entity_Id := Current_Scope; |
212 | Subp_Id : constant Entity_Id := | |
241ebe89 | 213 | Analyze_Subprogram_Specification (Specification (N)); |
996ae0b0 RK |
214 | |
215 | begin | |
ce5ba43a | 216 | Check_SPARK_05_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 217 | |
241ebe89 | 218 | Generate_Definition (Subp_Id); |
c9d70ab1 | 219 | |
241ebe89 HK |
220 | Set_Is_Abstract_Subprogram (Subp_Id); |
221 | New_Overloaded_Entity (Subp_Id); | |
222 | Check_Delayed_Subprogram (Subp_Id); | |
996ae0b0 | 223 | |
241ebe89 | 224 | Set_Categorization_From_Scope (Subp_Id, Scop); |
996ae0b0 | 225 | |
8636f52f | 226 | -- An abstract subprogram declared within a Ghost region is rendered |
c5cec2fe AC |
227 | -- Ghost (SPARK RM 6.9(2)). |
228 | ||
241ebe89 HK |
229 | if Ghost_Mode > None then |
230 | Set_Is_Ghost_Entity (Subp_Id); | |
c5cec2fe AC |
231 | end if; |
232 | ||
241ebe89 HK |
233 | if Ekind (Scope (Subp_Id)) = E_Protected_Type then |
234 | Error_Msg_N ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
235 | |
236 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
237 | -- operation nor an operation that overrides an inherited subprogram or | |
238 | -- predefined operator, since this most likely indicates a mistake. | |
239 | ||
240 | elsif Warn_On_Redundant_Constructs | |
241ebe89 HK |
241 | and then not Is_Dispatching_Operation (Subp_Id) |
242 | and then not Present (Overridden_Operation (Subp_Id)) | |
243 | and then (not Is_Operator_Symbol_Name (Chars (Subp_Id)) | |
244 | or else Scop /= Scope (Etype (First_Formal (Subp_Id)))) | |
5d37ba92 ES |
245 | then |
246 | Error_Msg_N | |
dbfeb4fa | 247 | ("abstract subprogram is not dispatching or overriding?r?", N); |
996ae0b0 | 248 | end if; |
fbf5a39b | 249 | |
241ebe89 HK |
250 | Generate_Reference_To_Formals (Subp_Id); |
251 | Check_Eliminated (Subp_Id); | |
eaba57fb RD |
252 | |
253 | if Has_Aspects (N) then | |
241ebe89 | 254 | Analyze_Aspect_Specifications (N, Subp_Id); |
eaba57fb | 255 | end if; |
996ae0b0 RK |
256 | end Analyze_Abstract_Subprogram_Declaration; |
257 | ||
b0186f71 AC |
258 | --------------------------------- |
259 | -- Analyze_Expression_Function -- | |
260 | --------------------------------- | |
261 | ||
262 | procedure Analyze_Expression_Function (N : Node_Id) is | |
8d1fe980 AC |
263 | Expr : constant Node_Id := Expression (N); |
264 | Loc : constant Source_Ptr := Sloc (N); | |
265 | LocX : constant Source_Ptr := Sloc (Expr); | |
266 | Spec : constant Node_Id := Specification (N); | |
d2d4b355 | 267 | |
d29f68cf | 268 | Def_Id : Entity_Id; |
b0186f71 | 269 | |
d29f68cf | 270 | Prev : Entity_Id; |
b0186f71 | 271 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
272 | -- declaration is completed. Def_Id is needed to analyze the spec. |
273 | ||
274 | New_Body : Node_Id; | |
d2d4b355 | 275 | New_Spec : Node_Id; |
b913199e | 276 | Ret : Node_Id; |
d29f68cf | 277 | Asp : Node_Id; |
b0186f71 AC |
278 | |
279 | begin | |
280 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 281 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
282 | -- function into an equivalent subprogram body, and analyze it. |
283 | ||
284 | -- Expression functions are inlined unconditionally. The back-end will | |
285 | -- determine whether this is possible. | |
286 | ||
287 | Inline_Processing_Required := True; | |
b727a82b | 288 | |
8d1fe980 AC |
289 | -- Create a specification for the generated body. This must be done |
290 | -- prior to the analysis of the initial declaration. | |
b727a82b | 291 | |
8d1fe980 AC |
292 | New_Spec := Copy_Subprogram_Spec (Spec); |
293 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
d2d4b355 AC |
294 | |
295 | -- If there are previous overloadable entities with the same name, | |
296 | -- check whether any of them is completed by the expression function. | |
b04d926e | 297 | -- In a generic context a formal subprogram has no completion. |
d2d4b355 | 298 | |
4b6f99f5 RD |
299 | if Present (Prev) |
300 | and then Is_Overloadable (Prev) | |
b04d926e AC |
301 | and then not Is_Formal_Subprogram (Prev) |
302 | then | |
51597c23 AC |
303 | Def_Id := Analyze_Subprogram_Specification (Spec); |
304 | Prev := Find_Corresponding_Spec (N); | |
35e7063a AC |
305 | |
306 | -- The previous entity may be an expression function as well, in | |
307 | -- which case the redeclaration is illegal. | |
308 | ||
309 | if Present (Prev) | |
5073ad7a AC |
310 | and then Nkind (Original_Node (Unit_Declaration_Node (Prev))) = |
311 | N_Expression_Function | |
35e7063a | 312 | then |
bc5e261c ES |
313 | Error_Msg_Sloc := Sloc (Prev); |
314 | Error_Msg_N ("& conflicts with declaration#", Def_Id); | |
35e7063a AC |
315 | return; |
316 | end if; | |
d2d4b355 | 317 | end if; |
b0186f71 | 318 | |
b913199e AC |
319 | Ret := Make_Simple_Return_Statement (LocX, Expression (N)); |
320 | ||
b0186f71 AC |
321 | New_Body := |
322 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 323 | Specification => New_Spec, |
b0186f71 AC |
324 | Declarations => Empty_List, |
325 | Handled_Statement_Sequence => | |
326 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 327 | Statements => New_List (Ret))); |
b0186f71 | 328 | |
e7f23f06 AC |
329 | -- If the expression completes a generic subprogram, we must create a |
330 | -- separate node for the body, because at instantiation the original | |
331 | -- node of the generic copy must be a generic subprogram body, and | |
332 | -- cannot be a expression function. Otherwise we just rewrite the | |
333 | -- expression with the non-generic body. | |
334 | ||
6d7e5c54 | 335 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
e7f23f06 | 336 | Insert_After (N, New_Body); |
6d7e5c54 | 337 | |
e7f23f06 AC |
338 | -- Propagate any aspects or pragmas that apply to the expression |
339 | -- function to the proper body when the expression function acts | |
340 | -- as a completion. | |
341 | ||
342 | if Has_Aspects (N) then | |
343 | Move_Aspects (N, To => New_Body); | |
344 | end if; | |
345 | ||
346 | Relocate_Pragmas_To_Body (New_Body); | |
b0186f71 | 347 | |
b0186f71 | 348 | Rewrite (N, Make_Null_Statement (Loc)); |
d2d4b355 | 349 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
350 | Analyze (N); |
351 | Analyze (New_Body); | |
d2b10647 | 352 | Set_Is_Inlined (Prev); |
b0186f71 | 353 | |
e5c4e2bc AC |
354 | -- If the expression function is a completion, the previous declaration |
355 | -- must come from source. We know already that appears in the current | |
356 | -- scope. The entity itself may be internally created if within a body | |
357 | -- to be inlined. | |
358 | ||
4b6f99f5 RD |
359 | elsif Present (Prev) |
360 | and then Comes_From_Source (Parent (Prev)) | |
b04d926e AC |
361 | and then not Is_Formal_Subprogram (Prev) |
362 | then | |
d2d4b355 | 363 | Set_Has_Completion (Prev, False); |
76264f60 | 364 | |
c6d2191a AC |
365 | -- An expression function that is a completion freezes the |
366 | -- expression. This means freezing the return type, and if it is | |
367 | -- an access type, freezing its designated type as well. | |
1b31321b | 368 | |
c6d2191a | 369 | -- Note that we cannot defer this freezing to the analysis of the |
1b31321b AC |
370 | -- expression itself, because a freeze node might appear in a nested |
371 | -- scope, leading to an elaboration order issue in gigi. | |
c6d2191a AC |
372 | |
373 | Freeze_Before (N, Etype (Prev)); | |
1b31321b | 374 | |
c6d2191a AC |
375 | if Is_Access_Type (Etype (Prev)) then |
376 | Freeze_Before (N, Designated_Type (Etype (Prev))); | |
377 | end if; | |
378 | ||
76264f60 AC |
379 | -- For navigation purposes, indicate that the function is a body |
380 | ||
381 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 382 | Rewrite (N, New_Body); |
e7f23f06 | 383 | |
c0cdbd39 AC |
384 | -- Correct the parent pointer of the aspect specification list to |
385 | -- reference the rewritten node. | |
386 | ||
387 | if Has_Aspects (N) then | |
388 | Set_Parent (Aspect_Specifications (N), N); | |
389 | end if; | |
390 | ||
e7f23f06 AC |
391 | -- Propagate any pragmas that apply to the expression function to the |
392 | -- proper body when the expression function acts as a completion. | |
393 | -- Aspects are automatically transfered because of node rewriting. | |
394 | ||
395 | Relocate_Pragmas_To_Body (N); | |
d2b10647 ES |
396 | Analyze (N); |
397 | ||
6d7e5c54 AC |
398 | -- Prev is the previous entity with the same name, but it is can |
399 | -- be an unrelated spec that is not completed by the expression | |
400 | -- function. In that case the relevant entity is the one in the body. | |
401 | -- Not clear that the backend can inline it in this case ??? | |
402 | ||
403 | if Has_Completion (Prev) then | |
404 | Set_Is_Inlined (Prev); | |
31af8899 AC |
405 | |
406 | -- The formals of the expression function are body formals, | |
407 | -- and do not appear in the ali file, which will only contain | |
408 | -- references to the formals of the original subprogram spec. | |
409 | ||
410 | declare | |
411 | F1 : Entity_Id; | |
412 | F2 : Entity_Id; | |
413 | ||
414 | begin | |
415 | F1 := First_Formal (Def_Id); | |
416 | F2 := First_Formal (Prev); | |
417 | ||
418 | while Present (F1) loop | |
419 | Set_Spec_Entity (F1, F2); | |
420 | Next_Formal (F1); | |
421 | Next_Formal (F2); | |
422 | end loop; | |
423 | end; | |
424 | ||
6d7e5c54 AC |
425 | else |
426 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
427 | end if; | |
428 | ||
0b5b2bbc | 429 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 430 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
431 | |
432 | else | |
a52e6d7e AC |
433 | -- An expression function that is not a completion is not a |
434 | -- subprogram declaration, and thus cannot appear in a protected | |
435 | -- definition. | |
436 | ||
437 | if Nkind (Parent (N)) = N_Protected_Definition then | |
438 | Error_Msg_N | |
439 | ("an expression function is not a legal protected operation", N); | |
440 | end if; | |
441 | ||
b8e6830b | 442 | Rewrite (N, Make_Subprogram_Declaration (Loc, Specification => Spec)); |
c0cdbd39 AC |
443 | |
444 | -- Correct the parent pointer of the aspect specification list to | |
445 | -- reference the rewritten node. | |
446 | ||
447 | if Has_Aspects (N) then | |
448 | Set_Parent (Aspect_Specifications (N), N); | |
449 | end if; | |
450 | ||
b0186f71 | 451 | Analyze (N); |
b04d926e | 452 | |
d29f68cf AC |
453 | -- If aspect SPARK_Mode was specified on the body, it needs to be |
454 | -- repeated both on the generated spec and the body. | |
455 | ||
456 | Asp := Find_Aspect (Defining_Unit_Name (Spec), Aspect_SPARK_Mode); | |
457 | ||
458 | if Present (Asp) then | |
459 | Asp := New_Copy_Tree (Asp); | |
460 | Set_Analyzed (Asp, False); | |
461 | Set_Aspect_Specifications (New_Body, New_List (Asp)); | |
462 | end if; | |
463 | ||
e699b76e AC |
464 | -- Within a generic pre-analyze the original expression for name |
465 | -- capture. The body is also generated but plays no role in | |
466 | -- this because it is not part of the original source. | |
b04d926e AC |
467 | |
468 | if Inside_A_Generic then | |
469 | declare | |
470 | Id : constant Entity_Id := Defining_Entity (N); | |
b04d926e AC |
471 | |
472 | begin | |
473 | Set_Has_Completion (Id); | |
b04d926e AC |
474 | Push_Scope (Id); |
475 | Install_Formals (Id); | |
e699b76e | 476 | Preanalyze_Spec_Expression (Expr, Etype (Id)); |
b04d926e | 477 | End_Scope; |
b04d926e AC |
478 | end; |
479 | end if; | |
480 | ||
b8e6830b AC |
481 | Set_Is_Inlined (Defining_Entity (N)); |
482 | ||
483 | -- Establish the linkages between the spec and the body. These are | |
484 | -- used when the expression function acts as the prefix of attribute | |
485 | -- 'Access in order to freeze the original expression which has been | |
486 | -- moved to the generated body. | |
487 | ||
488 | Set_Corresponding_Body (N, Defining_Entity (New_Body)); | |
489 | Set_Corresponding_Spec (New_Body, Defining_Entity (N)); | |
d2b10647 | 490 | |
6d7e5c54 AC |
491 | -- To prevent premature freeze action, insert the new body at the end |
492 | -- of the current declarations, or at the end of the package spec. | |
b913199e | 493 | -- However, resolve usage names now, to prevent spurious visibility |
ad4e3362 ES |
494 | -- on later entities. Note that the function can now be called in |
495 | -- the current declarative part, which will appear to be prior to | |
496 | -- the presence of the body in the code. There are nevertheless no | |
497 | -- order of elaboration issues because all name resolution has taken | |
498 | -- place at the point of declaration. | |
6d7e5c54 AC |
499 | |
500 | declare | |
e876c43a AC |
501 | Decls : List_Id := List_Containing (N); |
502 | Par : constant Node_Id := Parent (Decls); | |
b8e6830b | 503 | Id : constant Entity_Id := Defining_Entity (N); |
6d7e5c54 AC |
504 | |
505 | begin | |
fce54763 AC |
506 | -- If this is a wrapper created for in an instance for a formal |
507 | -- subprogram, insert body after declaration, to be analyzed when | |
508 | -- the enclosing instance is analyzed. | |
509 | ||
510 | if GNATprove_Mode | |
511 | and then Is_Generic_Actual_Subprogram (Defining_Entity (N)) | |
6d7e5c54 | 512 | then |
fce54763 AC |
513 | Insert_After (N, New_Body); |
514 | ||
515 | else | |
516 | if Nkind (Par) = N_Package_Specification | |
517 | and then Decls = Visible_Declarations (Par) | |
518 | and then Present (Private_Declarations (Par)) | |
519 | and then not Is_Empty_List (Private_Declarations (Par)) | |
520 | then | |
521 | Decls := Private_Declarations (Par); | |
522 | end if; | |
6d7e5c54 | 523 | |
fce54763 AC |
524 | Insert_After (Last (Decls), New_Body); |
525 | Push_Scope (Id); | |
526 | Install_Formals (Id); | |
3a8e3f63 | 527 | |
fce54763 AC |
528 | -- Preanalyze the expression for name capture, except in an |
529 | -- instance, where this has been done during generic analysis, | |
530 | -- and will be redone when analyzing the body. | |
845f06e2 | 531 | |
fce54763 AC |
532 | declare |
533 | Expr : constant Node_Id := Expression (Ret); | |
4058ddcc | 534 | |
fce54763 AC |
535 | begin |
536 | Set_Parent (Expr, Ret); | |
4058ddcc | 537 | |
fce54763 AC |
538 | if not In_Instance then |
539 | Preanalyze_Spec_Expression (Expr, Etype (Id)); | |
540 | end if; | |
541 | end; | |
3a8e3f63 | 542 | |
fce54763 AC |
543 | End_Scope; |
544 | end if; | |
6d7e5c54 | 545 | end; |
b0186f71 | 546 | end if; |
0b5b2bbc AC |
547 | |
548 | -- If the return expression is a static constant, we suppress warning | |
549 | -- messages on unused formals, which in most cases will be noise. | |
550 | ||
551 | Set_Is_Trivial_Subprogram (Defining_Entity (New_Body), | |
552 | Is_OK_Static_Expression (Expr)); | |
b0186f71 AC |
553 | end Analyze_Expression_Function; |
554 | ||
ec4867fa ES |
555 | ---------------------------------------- |
556 | -- Analyze_Extended_Return_Statement -- | |
557 | ---------------------------------------- | |
558 | ||
559 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
560 | begin | |
c86cf714 | 561 | Check_Compiler_Unit ("extended return statement", N); |
5d37ba92 | 562 | Analyze_Return_Statement (N); |
ec4867fa ES |
563 | end Analyze_Extended_Return_Statement; |
564 | ||
996ae0b0 RK |
565 | ---------------------------- |
566 | -- Analyze_Function_Call -- | |
567 | ---------------------------- | |
568 | ||
569 | procedure Analyze_Function_Call (N : Node_Id) is | |
a7e68e7f HK |
570 | Actuals : constant List_Id := Parameter_Associations (N); |
571 | Func_Nam : constant Node_Id := Name (N); | |
572 | Actual : Node_Id; | |
573 | ||
996ae0b0 | 574 | begin |
a7e68e7f | 575 | Analyze (Func_Nam); |
996ae0b0 | 576 | |
3e7302c3 AC |
577 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
578 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
579 | -- has been analyzed and we just return. | |
82c80734 | 580 | |
a7e68e7f HK |
581 | if Nkind (Func_Nam) = N_Selected_Component |
582 | and then Name (N) /= Func_Nam | |
82c80734 RD |
583 | and then Is_Rewrite_Substitution (N) |
584 | and then Present (Etype (N)) | |
585 | then | |
586 | return; | |
587 | end if; | |
588 | ||
996ae0b0 RK |
589 | -- If error analyzing name, then set Any_Type as result type and return |
590 | ||
a7e68e7f | 591 | if Etype (Func_Nam) = Any_Type then |
996ae0b0 RK |
592 | Set_Etype (N, Any_Type); |
593 | return; | |
594 | end if; | |
595 | ||
596 | -- Otherwise analyze the parameters | |
597 | ||
e24329cd YM |
598 | if Present (Actuals) then |
599 | Actual := First (Actuals); | |
996ae0b0 RK |
600 | while Present (Actual) loop |
601 | Analyze (Actual); | |
602 | Check_Parameterless_Call (Actual); | |
603 | Next (Actual); | |
604 | end loop; | |
605 | end if; | |
606 | ||
607 | Analyze_Call (N); | |
996ae0b0 RK |
608 | end Analyze_Function_Call; |
609 | ||
ec4867fa ES |
610 | ----------------------------- |
611 | -- Analyze_Function_Return -- | |
612 | ----------------------------- | |
613 | ||
614 | procedure Analyze_Function_Return (N : Node_Id) is | |
a7e68e7f HK |
615 | Loc : constant Source_Ptr := Sloc (N); |
616 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
617 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
ec4867fa | 618 | |
5d37ba92 | 619 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
620 | -- Function result subtype |
621 | ||
622 | procedure Check_Limited_Return (Expr : Node_Id); | |
623 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
624 | -- limited types. Used only for simple return statements. | |
625 | -- Expr is the expression returned. | |
626 | ||
627 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
628 | -- Check that the return_subtype_indication properly matches the result | |
629 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
630 | ||
631 | -------------------------- | |
632 | -- Check_Limited_Return -- | |
633 | -------------------------- | |
634 | ||
635 | procedure Check_Limited_Return (Expr : Node_Id) is | |
636 | begin | |
637 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
638 | -- removed and replaced by anonymous access results. This is an | |
639 | -- incompatibility with Ada 95. Not clear whether this should be | |
640 | -- enforced yet or perhaps controllable with special switch. ??? | |
641 | ||
ce72a9a3 AC |
642 | -- A limited interface that is not immutably limited is OK. |
643 | ||
644 | if Is_Limited_Interface (R_Type) | |
645 | and then | |
646 | not (Is_Task_Interface (R_Type) | |
647 | or else Is_Protected_Interface (R_Type) | |
648 | or else Is_Synchronized_Interface (R_Type)) | |
649 | then | |
650 | null; | |
651 | ||
652 | elsif Is_Limited_Type (R_Type) | |
653 | and then not Is_Interface (R_Type) | |
ec4867fa ES |
654 | and then Comes_From_Source (N) |
655 | and then not In_Instance_Body | |
2a31c32b | 656 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
657 | then |
658 | -- Error in Ada 2005 | |
659 | ||
0791fbe9 | 660 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
661 | and then not Debug_Flag_Dot_L |
662 | and then not GNAT_Mode | |
663 | then | |
664 | Error_Msg_N | |
3ccedacc AC |
665 | ("(Ada 2005) cannot copy object of a limited type " |
666 | & "(RM-2005 6.5(5.5/2))", Expr); | |
e0ae93e2 | 667 | |
51245e2d | 668 | if Is_Limited_View (R_Type) then |
ec4867fa ES |
669 | Error_Msg_N |
670 | ("\return by reference not permitted in Ada 2005", Expr); | |
671 | end if; | |
672 | ||
673 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
674 | -- incompatibility. | |
675 | ||
676 | -- In GNAT mode, this is just a warning, to allow it to be | |
677 | -- evilly turned off. Otherwise it is a real error. | |
678 | ||
9694c039 AC |
679 | -- In a generic context, simplify the warning because it makes |
680 | -- no sense to discuss pass-by-reference or copy. | |
681 | ||
ec4867fa | 682 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
683 | if Inside_A_Generic then |
684 | Error_Msg_N | |
885c4871 | 685 | ("return of limited object not permitted in Ada 2005 " |
dbfeb4fa | 686 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
9694c039 | 687 | |
51245e2d | 688 | elsif Is_Limited_View (R_Type) then |
ec4867fa | 689 | Error_Msg_N |
20261dc1 | 690 | ("return by reference not permitted in Ada 2005 " |
dbfeb4fa | 691 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
692 | else |
693 | Error_Msg_N | |
20261dc1 | 694 | ("cannot copy object of a limited type in Ada 2005 " |
dbfeb4fa | 695 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
696 | end if; |
697 | ||
698 | -- Ada 95 mode, compatibility warnings disabled | |
699 | ||
700 | else | |
701 | return; -- skip continuation messages below | |
702 | end if; | |
703 | ||
9694c039 AC |
704 | if not Inside_A_Generic then |
705 | Error_Msg_N | |
706 | ("\consider switching to return of access type", Expr); | |
707 | Explain_Limited_Type (R_Type, Expr); | |
708 | end if; | |
ec4867fa ES |
709 | end if; |
710 | end Check_Limited_Return; | |
711 | ||
712 | ------------------------------------- | |
713 | -- Check_Return_Subtype_Indication -- | |
714 | ------------------------------------- | |
715 | ||
716 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
717 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
718 | ||
719 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
720 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
721 | |
722 | Subtype_Ind : constant Node_Id := | |
723 | Object_Definition (Original_Node (Obj_Decl)); | |
724 | ||
7f568bfa AC |
725 | R_Type_Is_Anon_Access : constant Boolean := |
726 | Ekind_In (R_Type, | |
727 | E_Anonymous_Access_Subprogram_Type, | |
728 | E_Anonymous_Access_Protected_Subprogram_Type, | |
729 | E_Anonymous_Access_Type); | |
ec4867fa ES |
730 | -- True if return type of the function is an anonymous access type |
731 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
732 | ||
7f568bfa AC |
733 | R_Stm_Type_Is_Anon_Access : constant Boolean := |
734 | Ekind_In (R_Stm_Type, | |
735 | E_Anonymous_Access_Subprogram_Type, | |
736 | E_Anonymous_Access_Protected_Subprogram_Type, | |
737 | E_Anonymous_Access_Type); | |
ec4867fa ES |
738 | -- True if type of the return object is an anonymous access type |
739 | ||
7f568bfa AC |
740 | procedure Error_No_Match (N : Node_Id); |
741 | -- Output error messages for case where types do not statically | |
742 | -- match. N is the location for the messages. | |
743 | ||
744 | -------------------- | |
745 | -- Error_No_Match -- | |
746 | -------------------- | |
747 | ||
748 | procedure Error_No_Match (N : Node_Id) is | |
749 | begin | |
750 | Error_Msg_N | |
751 | ("subtype must statically match function result subtype", N); | |
752 | ||
753 | if not Predicates_Match (R_Stm_Type, R_Type) then | |
754 | Error_Msg_Node_2 := R_Type; | |
755 | Error_Msg_NE | |
3ccedacc | 756 | ("\predicate of& does not match predicate of&", |
7f568bfa AC |
757 | N, R_Stm_Type); |
758 | end if; | |
759 | end Error_No_Match; | |
760 | ||
761 | -- Start of processing for Check_Return_Subtype_Indication | |
762 | ||
ec4867fa | 763 | begin |
7665e4bd | 764 | -- First, avoid cascaded errors |
ec4867fa ES |
765 | |
766 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
767 | return; | |
768 | end if; | |
769 | ||
770 | -- "return access T" case; check that the return statement also has | |
771 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 772 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
773 | |
774 | if R_Type_Is_Anon_Access then | |
775 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
776 | if |
777 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 778 | then |
53cf4600 ES |
779 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
780 | Base_Type (Designated_Type (R_Type)) | |
781 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
782 | then | |
7f568bfa | 783 | Error_No_Match (Subtype_Mark (Subtype_Ind)); |
53cf4600 ES |
784 | end if; |
785 | ||
786 | else | |
787 | -- For two anonymous access to subprogram types, the | |
788 | -- types themselves must be type conformant. | |
789 | ||
790 | if not Conforming_Types | |
791 | (R_Stm_Type, R_Type, Fully_Conformant) | |
792 | then | |
7f568bfa | 793 | Error_No_Match (Subtype_Ind); |
53cf4600 | 794 | end if; |
ec4867fa | 795 | end if; |
0a36105d | 796 | |
ec4867fa ES |
797 | else |
798 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
799 | end if; | |
800 | ||
6cce2156 GD |
801 | -- If the return object is of an anonymous access type, then report |
802 | -- an error if the function's result type is not also anonymous. | |
803 | ||
804 | elsif R_Stm_Type_Is_Anon_Access | |
805 | and then not R_Type_Is_Anon_Access | |
806 | then | |
3ccedacc AC |
807 | Error_Msg_N ("anonymous access not allowed for function with " |
808 | & "named access result", Subtype_Ind); | |
6cce2156 | 809 | |
81d93365 AC |
810 | -- Subtype indication case: check that the return object's type is |
811 | -- covered by the result type, and that the subtypes statically match | |
812 | -- when the result subtype is constrained. Also handle record types | |
813 | -- with unknown discriminants for which we have built the underlying | |
814 | -- record view. Coverage is needed to allow specific-type return | |
815 | -- objects when the result type is class-wide (see AI05-32). | |
816 | ||
817 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 818 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
819 | and then |
820 | Covers | |
821 | (Base_Type (R_Type), | |
822 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
823 | then |
824 | -- A null exclusion may be present on the return type, on the | |
825 | -- function specification, on the object declaration or on the | |
826 | -- subtype itself. | |
ec4867fa | 827 | |
21d27997 RD |
828 | if Is_Access_Type (R_Type) |
829 | and then | |
830 | (Can_Never_Be_Null (R_Type) | |
831 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
832 | Can_Never_Be_Null (R_Stm_Type) | |
833 | then | |
7f568bfa | 834 | Error_No_Match (Subtype_Ind); |
21d27997 RD |
835 | end if; |
836 | ||
105b5e65 | 837 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
838 | |
839 | if Is_Constrained (R_Type) | |
840 | or else Is_Access_Type (R_Type) | |
841 | then | |
ec4867fa | 842 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
7f568bfa | 843 | Error_No_Match (Subtype_Ind); |
ec4867fa ES |
844 | end if; |
845 | end if; | |
846 | ||
a8b346d2 RD |
847 | -- All remaining cases are illegal |
848 | ||
849 | -- Note: previous versions of this subprogram allowed the return | |
850 | -- value to be the ancestor of the return type if the return type | |
851 | -- was a null extension. This was plainly incorrect. | |
ff7139c3 | 852 | |
ec4867fa ES |
853 | else |
854 | Error_Msg_N | |
855 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
856 | end if; | |
857 | end Check_Return_Subtype_Indication; | |
858 | ||
859 | --------------------- | |
860 | -- Local Variables -- | |
861 | --------------------- | |
862 | ||
445e5888 AC |
863 | Expr : Node_Id; |
864 | Obj_Decl : Node_Id; | |
ec4867fa ES |
865 | |
866 | -- Start of processing for Analyze_Function_Return | |
867 | ||
868 | begin | |
869 | Set_Return_Present (Scope_Id); | |
870 | ||
5d37ba92 | 871 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 872 | Expr := Expression (N); |
4ee646da | 873 | |
e917aec2 RD |
874 | -- Guard against a malformed expression. The parser may have tried to |
875 | -- recover but the node is not analyzable. | |
4ee646da AC |
876 | |
877 | if Nkind (Expr) = N_Error then | |
878 | Set_Etype (Expr, Any_Type); | |
879 | Expander_Mode_Save_And_Set (False); | |
880 | return; | |
881 | ||
882 | else | |
0180fd26 AC |
883 | -- The resolution of a controlled [extension] aggregate associated |
884 | -- with a return statement creates a temporary which needs to be | |
885 | -- finalized on function exit. Wrap the return statement inside a | |
886 | -- block so that the finalization machinery can detect this case. | |
887 | -- This early expansion is done only when the return statement is | |
888 | -- not part of a handled sequence of statements. | |
889 | ||
890 | if Nkind_In (Expr, N_Aggregate, | |
891 | N_Extension_Aggregate) | |
892 | and then Needs_Finalization (R_Type) | |
893 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
894 | then | |
895 | Rewrite (N, | |
896 | Make_Block_Statement (Loc, | |
897 | Handled_Statement_Sequence => | |
898 | Make_Handled_Sequence_Of_Statements (Loc, | |
899 | Statements => New_List (Relocate_Node (N))))); | |
900 | ||
901 | Analyze (N); | |
902 | return; | |
903 | end if; | |
904 | ||
4b963531 AC |
905 | Analyze (Expr); |
906 | ||
907 | -- Ada 2005 (AI-251): If the type of the returned object is | |
908 | -- an access to an interface type then we add an implicit type | |
909 | -- conversion to force the displacement of the "this" pointer to | |
910 | -- reference the secondary dispatch table. We cannot delay the | |
911 | -- generation of this implicit conversion until the expansion | |
912 | -- because in this case the type resolution changes the decoration | |
913 | -- of the expression node to match R_Type; by contrast, if the | |
914 | -- returned object is a class-wide interface type then it is too | |
915 | -- early to generate here the implicit conversion since the return | |
916 | -- statement may be rewritten by the expander into an extended | |
917 | -- return statement whose expansion takes care of adding the | |
918 | -- implicit type conversion to displace the pointer to the object. | |
919 | ||
920 | if Expander_Active | |
921 | and then Serious_Errors_Detected = 0 | |
922 | and then Is_Access_Type (R_Type) | |
923 | and then Nkind (Expr) /= N_Null | |
924 | and then Is_Interface (Designated_Type (R_Type)) | |
925 | and then Is_Progenitor (Designated_Type (R_Type), | |
926 | Designated_Type (Etype (Expr))) | |
927 | then | |
73e5aa55 | 928 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); |
4b963531 AC |
929 | Analyze (Expr); |
930 | end if; | |
931 | ||
932 | Resolve (Expr, R_Type); | |
4ee646da AC |
933 | Check_Limited_Return (Expr); |
934 | end if; | |
ec4867fa | 935 | |
ad05f2e9 | 936 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 937 | |
fe5d3068 | 938 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
939 | and then |
940 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 941 | or else Present (Next (N))) |
607d0635 | 942 | then |
ce5ba43a | 943 | Check_SPARK_05_Restriction |
fe5d3068 | 944 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
945 | end if; |
946 | ||
ec4867fa | 947 | else |
ce5ba43a | 948 | Check_SPARK_05_Restriction ("extended RETURN is not allowed", N); |
445e5888 | 949 | Obj_Decl := Last (Return_Object_Declarations (N)); |
607d0635 | 950 | |
ec4867fa ES |
951 | -- Analyze parts specific to extended_return_statement: |
952 | ||
953 | declare | |
de6cad7c | 954 | Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
b9daa96e | 955 | HSS : constant Node_Id := Handled_Statement_Sequence (N); |
ec4867fa ES |
956 | |
957 | begin | |
958 | Expr := Expression (Obj_Decl); | |
959 | ||
960 | -- Note: The check for OK_For_Limited_Init will happen in | |
961 | -- Analyze_Object_Declaration; we treat it as a normal | |
962 | -- object declaration. | |
963 | ||
cd1c668b | 964 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
965 | Analyze (Obj_Decl); |
966 | ||
ec4867fa ES |
967 | Check_Return_Subtype_Indication (Obj_Decl); |
968 | ||
969 | if Present (HSS) then | |
970 | Analyze (HSS); | |
971 | ||
972 | if Present (Exception_Handlers (HSS)) then | |
973 | ||
974 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
975 | -- Probably by creating an actual N_Block_Statement. | |
976 | -- Probably in Expand. | |
977 | ||
978 | null; | |
979 | end if; | |
980 | end if; | |
981 | ||
9337aa0a AC |
982 | -- Mark the return object as referenced, since the return is an |
983 | -- implicit reference of the object. | |
984 | ||
985 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
986 | ||
ec4867fa | 987 | Check_References (Stm_Entity); |
de6cad7c AC |
988 | |
989 | -- Check RM 6.5 (5.9/3) | |
990 | ||
991 | if Has_Aliased then | |
992 | if Ada_Version < Ada_2012 then | |
dbfeb4fa RD |
993 | |
994 | -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? | |
995 | -- Can it really happen (extended return???) | |
996 | ||
997 | Error_Msg_N | |
b785e0b8 AC |
998 | ("aliased only allowed for limited return objects " |
999 | & "in Ada 2012??", N); | |
de6cad7c | 1000 | |
51245e2d | 1001 | elsif not Is_Limited_View (R_Type) then |
3ccedacc AC |
1002 | Error_Msg_N |
1003 | ("aliased only allowed for limited return objects", N); | |
de6cad7c AC |
1004 | end if; |
1005 | end if; | |
ec4867fa ES |
1006 | end; |
1007 | end if; | |
1008 | ||
21d27997 | 1009 | -- Case of Expr present |
5d37ba92 | 1010 | |
ec4867fa | 1011 | if Present (Expr) |
21d27997 | 1012 | |
8fde064e | 1013 | -- Defend against previous errors |
21d27997 RD |
1014 | |
1015 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 1016 | and then Present (Etype (Expr)) |
ec4867fa | 1017 | then |
5d37ba92 ES |
1018 | -- Apply constraint check. Note that this is done before the implicit |
1019 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 1020 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
1021 | -- with null-excluding expressions found in return statements. |
1022 | ||
1023 | Apply_Constraint_Check (Expr, R_Type); | |
1024 | ||
1025 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
1026 | -- type, apply an implicit conversion of the expression to that type | |
1027 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 1028 | |
0791fbe9 | 1029 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
1030 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
1031 | then | |
1032 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
1033 | Analyze_And_Resolve (Expr, R_Type); | |
b6b5cca8 AC |
1034 | |
1035 | -- If this is a local anonymous access to subprogram, the | |
1036 | -- accessibility check can be applied statically. The return is | |
1037 | -- illegal if the access type of the return expression is declared | |
1038 | -- inside of the subprogram (except if it is the subtype indication | |
1039 | -- of an extended return statement). | |
1040 | ||
9fe696a3 | 1041 | elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then |
b6b5cca8 AC |
1042 | if not Comes_From_Source (Current_Scope) |
1043 | or else Ekind (Current_Scope) = E_Return_Statement | |
1044 | then | |
1045 | null; | |
1046 | ||
1047 | elsif | |
1048 | Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) | |
1049 | then | |
1050 | Error_Msg_N ("cannot return local access to subprogram", N); | |
1051 | end if; | |
1ebc2612 AC |
1052 | |
1053 | -- The expression cannot be of a formal incomplete type | |
1054 | ||
1055 | elsif Ekind (Etype (Expr)) = E_Incomplete_Type | |
1056 | and then Is_Generic_Type (Etype (Expr)) | |
1057 | then | |
1058 | Error_Msg_N | |
1059 | ("cannot return expression of a formal incomplete type", N); | |
ec4867fa ES |
1060 | end if; |
1061 | ||
21d27997 RD |
1062 | -- If the result type is class-wide, then check that the return |
1063 | -- expression's type is not declared at a deeper level than the | |
1064 | -- function (RM05-6.5(5.6/2)). | |
1065 | ||
0791fbe9 | 1066 | if Ada_Version >= Ada_2005 |
21d27997 RD |
1067 | and then Is_Class_Wide_Type (R_Type) |
1068 | then | |
1069 | if Type_Access_Level (Etype (Expr)) > | |
1070 | Subprogram_Access_Level (Scope_Id) | |
1071 | then | |
1072 | Error_Msg_N | |
3ccedacc AC |
1073 | ("level of return expression type is deeper than " |
1074 | & "class-wide function!", Expr); | |
21d27997 RD |
1075 | end if; |
1076 | end if; | |
1077 | ||
4755cce9 JM |
1078 | -- Check incorrect use of dynamically tagged expression |
1079 | ||
1080 | if Is_Tagged_Type (R_Type) then | |
1081 | Check_Dynamically_Tagged_Expression | |
1082 | (Expr => Expr, | |
1083 | Typ => R_Type, | |
1084 | Related_Nod => N); | |
ec4867fa ES |
1085 | end if; |
1086 | ||
ec4867fa ES |
1087 | -- ??? A real run-time accessibility check is needed in cases |
1088 | -- involving dereferences of access parameters. For now we just | |
1089 | -- check the static cases. | |
1090 | ||
0791fbe9 | 1091 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
51245e2d | 1092 | and then Is_Limited_View (Etype (Scope_Id)) |
ec4867fa ES |
1093 | and then Object_Access_Level (Expr) > |
1094 | Subprogram_Access_Level (Scope_Id) | |
1095 | then | |
9694c039 AC |
1096 | -- Suppress the message in a generic, where the rewriting |
1097 | -- is irrelevant. | |
1098 | ||
1099 | if Inside_A_Generic then | |
1100 | null; | |
1101 | ||
1102 | else | |
1103 | Rewrite (N, | |
1104 | Make_Raise_Program_Error (Loc, | |
1105 | Reason => PE_Accessibility_Check_Failed)); | |
1106 | Analyze (N); | |
1107 | ||
43417b90 | 1108 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
1109 | Error_Msg_N ("cannot return a local value by reference<<", N); |
1110 | Error_Msg_NE ("\& [<<", N, Standard_Program_Error); | |
9694c039 | 1111 | end if; |
ec4867fa | 1112 | end if; |
5d37ba92 ES |
1113 | |
1114 | if Known_Null (Expr) | |
1115 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
1116 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
1117 | then | |
1118 | Apply_Compile_Time_Constraint_Error | |
1119 | (N => Expr, | |
1120 | Msg => "(Ada 2005) null not allowed for " | |
dbfeb4fa | 1121 | & "null-excluding return??", |
5d37ba92 ES |
1122 | Reason => CE_Null_Not_Allowed); |
1123 | end if; | |
445e5888 AC |
1124 | |
1125 | -- RM 6.5 (5.4/3): accessibility checks also apply if the return object | |
1126 | -- has no initializing expression. | |
1127 | ||
1128 | elsif Ada_Version > Ada_2005 and then Is_Class_Wide_Type (R_Type) then | |
1129 | if Type_Access_Level (Etype (Defining_Identifier (Obj_Decl))) > | |
1130 | Subprogram_Access_Level (Scope_Id) | |
1131 | then | |
1132 | Error_Msg_N | |
1133 | ("level of return expression type is deeper than " | |
1134 | & "class-wide function!", Obj_Decl); | |
1135 | end if; | |
ec4867fa ES |
1136 | end if; |
1137 | end Analyze_Function_Return; | |
1138 | ||
996ae0b0 RK |
1139 | ------------------------------------- |
1140 | -- Analyze_Generic_Subprogram_Body -- | |
1141 | ------------------------------------- | |
1142 | ||
1143 | procedure Analyze_Generic_Subprogram_Body | |
1144 | (N : Node_Id; | |
1145 | Gen_Id : Entity_Id) | |
1146 | is | |
fbf5a39b | 1147 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 1148 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 1149 | Body_Id : Entity_Id; |
996ae0b0 | 1150 | New_N : Node_Id; |
fbf5a39b | 1151 | Spec : Node_Id; |
996ae0b0 RK |
1152 | |
1153 | begin | |
82c80734 RD |
1154 | -- Copy body and disable expansion while analyzing the generic For a |
1155 | -- stub, do not copy the stub (which would load the proper body), this | |
1156 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
1157 | |
1158 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
1159 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
1160 | Rewrite (N, New_N); | |
caf07df9 AC |
1161 | |
1162 | -- Once the contents of the generic copy and the template are | |
1163 | -- swapped, do the same for their respective aspect specifications. | |
1164 | ||
1165 | Exchange_Aspects (N, New_N); | |
1166 | ||
1167 | -- Collect all contract-related source pragmas found within the | |
1168 | -- template and attach them to the contract of the subprogram body. | |
1169 | -- This contract is used in the capture of global references within | |
1170 | -- annotations. | |
1171 | ||
1172 | Create_Generic_Contract (N); | |
1173 | ||
996ae0b0 RK |
1174 | Start_Generic; |
1175 | end if; | |
1176 | ||
1177 | Spec := Specification (N); | |
1178 | ||
1179 | -- Within the body of the generic, the subprogram is callable, and | |
1180 | -- behaves like the corresponding non-generic unit. | |
1181 | ||
fbf5a39b | 1182 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
1183 | |
1184 | if Kind = E_Generic_Procedure | |
1185 | and then Nkind (Spec) /= N_Procedure_Specification | |
1186 | then | |
fbf5a39b | 1187 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
1188 | return; |
1189 | ||
1190 | elsif Kind = E_Generic_Function | |
1191 | and then Nkind (Spec) /= N_Function_Specification | |
1192 | then | |
fbf5a39b | 1193 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
1194 | return; |
1195 | end if; | |
1196 | ||
fbf5a39b | 1197 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
1198 | |
1199 | if Has_Completion (Gen_Id) | |
1200 | and then Nkind (Parent (N)) /= N_Subunit | |
1201 | then | |
1202 | Error_Msg_N ("duplicate generic body", N); | |
1203 | return; | |
1204 | else | |
1205 | Set_Has_Completion (Gen_Id); | |
1206 | end if; | |
1207 | ||
1208 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1209 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1210 | else | |
1211 | Set_Corresponding_Spec (N, Gen_Id); | |
1212 | end if; | |
1213 | ||
1214 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1215 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1216 | end if; | |
1217 | ||
1218 | -- Make generic parameters immediately visible in the body. They are | |
1219 | -- needed to process the formals declarations. Then make the formals | |
1220 | -- visible in a separate step. | |
1221 | ||
0a36105d | 1222 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1223 | |
1224 | declare | |
1225 | E : Entity_Id; | |
1226 | First_Ent : Entity_Id; | |
1227 | ||
1228 | begin | |
1229 | First_Ent := First_Entity (Gen_Id); | |
1230 | ||
1231 | E := First_Ent; | |
1232 | while Present (E) and then not Is_Formal (E) loop | |
1233 | Install_Entity (E); | |
1234 | Next_Entity (E); | |
1235 | end loop; | |
1236 | ||
1237 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1238 | ||
1239 | -- Now generic formals are visible, and the specification can be | |
1240 | -- analyzed, for subsequent conformance check. | |
1241 | ||
fbf5a39b | 1242 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1243 | |
fbf5a39b | 1244 | -- Make formal parameters visible |
996ae0b0 RK |
1245 | |
1246 | if Present (E) then | |
1247 | ||
fbf5a39b AC |
1248 | -- E is the first formal parameter, we loop through the formals |
1249 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1250 | |
1251 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1252 | while Present (E) loop |
1253 | Install_Entity (E); | |
1254 | Next_Formal (E); | |
1255 | end loop; | |
1256 | end if; | |
1257 | ||
e895b435 | 1258 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1259 | |
ec4867fa ES |
1260 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
1261 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
1262 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1263 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1264 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
c5cec2fe AC |
1265 | |
1266 | -- Inherit the "ghostness" of the generic spec. Note that this | |
1267 | -- property is not directly inherited as the body may be subject | |
1268 | -- to a different Ghost assertion policy. | |
1269 | ||
8636f52f | 1270 | if Is_Ghost_Entity (Gen_Id) or else Ghost_Mode > None then |
c5cec2fe AC |
1271 | Set_Is_Ghost_Entity (Body_Id); |
1272 | ||
1273 | -- The Ghost policy in effect at the point of declaration and at | |
c2cfccb1 | 1274 | -- the point of completion must match (SPARK RM 6.9(14)). |
c5cec2fe AC |
1275 | |
1276 | Check_Ghost_Completion (Gen_Id, Body_Id); | |
1277 | end if; | |
1278 | ||
fbf5a39b AC |
1279 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1280 | ||
1281 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1282 | ||
e895b435 | 1283 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1284 | |
1285 | Set_Ekind (Gen_Id, Kind); | |
1286 | Set_Ekind (Body_Id, Kind); | |
1287 | ||
1288 | if Present (First_Ent) then | |
1289 | Set_First_Entity (Gen_Id, First_Ent); | |
1290 | end if; | |
1291 | ||
1292 | End_Scope; | |
1293 | return; | |
1294 | end if; | |
996ae0b0 | 1295 | |
82c80734 RD |
1296 | -- If this is a compilation unit, it must be made visible explicitly, |
1297 | -- because the compilation of the declaration, unlike other library | |
1298 | -- unit declarations, does not. If it is not a unit, the following | |
1299 | -- is redundant but harmless. | |
996ae0b0 RK |
1300 | |
1301 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1302 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1303 | |
ec4867fa ES |
1304 | if Is_Child_Unit (Gen_Id) then |
1305 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1306 | end if; | |
1307 | ||
996ae0b0 | 1308 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 | 1309 | |
579847c2 | 1310 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
f145ece7 | 1311 | Set_SPARK_Pragma_Inherited (Body_Id); |
579847c2 | 1312 | |
caf07df9 AC |
1313 | -- Analyze any aspect specifications that appear on the generic |
1314 | -- subprogram body. | |
1315 | ||
1316 | if Has_Aspects (N) then | |
1317 | Analyze_Aspect_Specifications_On_Body_Or_Stub (N); | |
1318 | end if; | |
1319 | ||
996ae0b0 RK |
1320 | Analyze_Declarations (Declarations (N)); |
1321 | Check_Completion; | |
996ae0b0 | 1322 | |
caf07df9 AC |
1323 | -- When a generic subprogram body appears inside a package, its |
1324 | -- contract is analyzed at the end of the package body declarations. | |
1325 | -- This is due to the delay with respect of the package contract upon | |
1326 | -- which the body contract may depend. When the generic subprogram | |
1327 | -- body is a compilation unit, this delay is not necessary. | |
1328 | ||
1329 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1330 | Analyze_Subprogram_Body_Contract (Body_Id); | |
1331 | ||
1332 | -- Capture all global references in a generic subprogram body | |
1333 | -- that acts as a compilation unit now that the contract has | |
1334 | -- been analyzed. | |
1335 | ||
1336 | Save_Global_References_In_Contract | |
1337 | (Templ => Original_Node (N), | |
1338 | Gen_Id => Gen_Id); | |
1339 | end if; | |
1340 | ||
1341 | Analyze (Handled_Statement_Sequence (N)); | |
996ae0b0 RK |
1342 | Save_Global_References (Original_Node (N)); |
1343 | ||
82c80734 RD |
1344 | -- Prior to exiting the scope, include generic formals again (if any |
1345 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1346 | |
1347 | if Present (First_Ent) then | |
1348 | Set_First_Entity (Gen_Id, First_Ent); | |
1349 | end if; | |
1350 | ||
fbf5a39b | 1351 | Check_References (Gen_Id); |
996ae0b0 RK |
1352 | end; |
1353 | ||
e6f69614 | 1354 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1355 | End_Scope; |
1356 | Check_Subprogram_Order (N); | |
1357 | ||
e895b435 | 1358 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1359 | |
1360 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1361 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1362 | |
1363 | if Style_Check then | |
1364 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1365 | end if; | |
13d923cc | 1366 | |
996ae0b0 | 1367 | End_Generic; |
996ae0b0 RK |
1368 | end Analyze_Generic_Subprogram_Body; |
1369 | ||
4d8f3296 ES |
1370 | ---------------------------- |
1371 | -- Analyze_Null_Procedure -- | |
1372 | ---------------------------- | |
1373 | ||
1374 | procedure Analyze_Null_Procedure | |
1375 | (N : Node_Id; | |
1376 | Is_Completion : out Boolean) | |
1377 | is | |
1378 | Loc : constant Source_Ptr := Sloc (N); | |
1379 | Spec : constant Node_Id := Specification (N); | |
1380 | Designator : Entity_Id; | |
1381 | Form : Node_Id; | |
1382 | Null_Body : Node_Id := Empty; | |
1383 | Prev : Entity_Id; | |
1384 | ||
1385 | begin | |
1386 | -- Capture the profile of the null procedure before analysis, for | |
1387 | -- expansion at the freeze point and at each point of call. The body is | |
1388 | -- used if the procedure has preconditions, or if it is a completion. In | |
1389 | -- the first case the body is analyzed at the freeze point, in the other | |
1390 | -- it replaces the null procedure declaration. | |
1391 | ||
1392 | Null_Body := | |
1393 | Make_Subprogram_Body (Loc, | |
1394 | Specification => New_Copy_Tree (Spec), | |
8c35b40a | 1395 | Declarations => New_List, |
4d8f3296 ES |
1396 | Handled_Statement_Sequence => |
1397 | Make_Handled_Sequence_Of_Statements (Loc, | |
1398 | Statements => New_List (Make_Null_Statement (Loc)))); | |
1399 | ||
1400 | -- Create new entities for body and formals | |
1401 | ||
1402 | Set_Defining_Unit_Name (Specification (Null_Body), | |
9d2a2071 AC |
1403 | Make_Defining_Identifier |
1404 | (Sloc (Defining_Entity (N)), | |
1405 | Chars (Defining_Entity (N)))); | |
4d8f3296 ES |
1406 | |
1407 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1408 | while Present (Form) loop | |
1409 | Set_Defining_Identifier (Form, | |
9d2a2071 AC |
1410 | Make_Defining_Identifier |
1411 | (Sloc (Defining_Identifier (Form)), | |
1412 | Chars (Defining_Identifier (Form)))); | |
4d8f3296 ES |
1413 | Next (Form); |
1414 | end loop; | |
1415 | ||
1416 | -- Determine whether the null procedure may be a completion of a generic | |
1417 | -- suprogram, in which case we use the new null body as the completion | |
1418 | -- and set minimal semantic information on the original declaration, | |
1419 | -- which is rewritten as a null statement. | |
1420 | ||
1421 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
1422 | ||
1423 | if Present (Prev) and then Is_Generic_Subprogram (Prev) then | |
1424 | Insert_Before (N, Null_Body); | |
1425 | Set_Ekind (Defining_Entity (N), Ekind (Prev)); | |
4d8f3296 ES |
1426 | |
1427 | Rewrite (N, Make_Null_Statement (Loc)); | |
1428 | Analyze_Generic_Subprogram_Body (Null_Body, Prev); | |
1429 | Is_Completion := True; | |
1430 | return; | |
1431 | ||
1432 | else | |
4d8f3296 ES |
1433 | -- Resolve the types of the formals now, because the freeze point |
1434 | -- may appear in a different context, e.g. an instantiation. | |
1435 | ||
1436 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1437 | while Present (Form) loop | |
1438 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
1439 | Find_Type (Parameter_Type (Form)); | |
1440 | ||
1441 | elsif | |
1442 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
1443 | then | |
1444 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
1445 | ||
1446 | else | |
1447 | -- The case of a null procedure with a formal that is an | |
1448 | -- access_to_subprogram type, and that is used as an actual | |
1449 | -- in an instantiation is left to the enthusiastic reader. | |
1450 | ||
1451 | null; | |
1452 | end if; | |
1453 | ||
1454 | Next (Form); | |
1455 | end loop; | |
1456 | end if; | |
1457 | ||
1458 | -- If there are previous overloadable entities with the same name, | |
1459 | -- check whether any of them is completed by the null procedure. | |
1460 | ||
1461 | if Present (Prev) and then Is_Overloadable (Prev) then | |
1462 | Designator := Analyze_Subprogram_Specification (Spec); | |
1463 | Prev := Find_Corresponding_Spec (N); | |
1464 | end if; | |
1465 | ||
1466 | if No (Prev) or else not Comes_From_Source (Prev) then | |
1467 | Designator := Analyze_Subprogram_Specification (Spec); | |
1468 | Set_Has_Completion (Designator); | |
1469 | ||
1470 | -- Signal to caller that this is a procedure declaration | |
1471 | ||
1472 | Is_Completion := False; | |
1473 | ||
1474 | -- Null procedures are always inlined, but generic formal subprograms | |
1475 | -- which appear as such in the internal instance of formal packages, | |
1476 | -- need no completion and are not marked Inline. | |
1477 | ||
1478 | if Expander_Active | |
1479 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
1480 | then | |
1481 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
1482 | Set_Body_To_Inline (N, Null_Body); | |
1483 | Set_Is_Inlined (Designator); | |
1484 | end if; | |
1485 | ||
1486 | else | |
2fe258bf AC |
1487 | -- The null procedure is a completion. We unconditionally rewrite |
1488 | -- this as a null body (even if expansion is not active), because | |
1489 | -- there are various error checks that are applied on this body | |
1490 | -- when it is analyzed (e.g. correct aspect placement). | |
4d8f3296 | 1491 | |
a98480dd AC |
1492 | if Has_Completion (Prev) then |
1493 | Error_Msg_Sloc := Sloc (Prev); | |
1494 | Error_Msg_NE ("duplicate body for & declared#", N, Prev); | |
1495 | end if; | |
1496 | ||
4d8f3296 | 1497 | Is_Completion := True; |
2fe258bf AC |
1498 | Rewrite (N, Null_Body); |
1499 | Analyze (N); | |
4d8f3296 ES |
1500 | end if; |
1501 | end Analyze_Null_Procedure; | |
1502 | ||
996ae0b0 RK |
1503 | ----------------------------- |
1504 | -- Analyze_Operator_Symbol -- | |
1505 | ----------------------------- | |
1506 | ||
82c80734 RD |
1507 | -- An operator symbol such as "+" or "and" may appear in context where the |
1508 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1509 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1510 | -- generates this node, and the semantics does the disambiguation. Other | |
1511 | -- such case are actuals in an instantiation, the generic unit in an | |
1512 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1513 | |
1514 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1515 | Par : constant Node_Id := Parent (N); | |
1516 | ||
1517 | begin | |
1f0b1e48 | 1518 | if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
996ae0b0 | 1519 | or else Nkind (Par) = N_Function_Instantiation |
1f0b1e48 | 1520 | or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
996ae0b0 | 1521 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1f0b1e48 | 1522 | and then not Is_Pragma_String_Literal (Par)) |
996ae0b0 | 1523 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
800621e0 RD |
1524 | or else (Nkind (Par) = N_Attribute_Reference |
1525 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1526 | then |
1527 | Find_Direct_Name (N); | |
1528 | ||
1529 | else | |
1530 | Change_Operator_Symbol_To_String_Literal (N); | |
1531 | Analyze (N); | |
1532 | end if; | |
1533 | end Analyze_Operator_Symbol; | |
1534 | ||
1535 | ----------------------------------- | |
1536 | -- Analyze_Parameter_Association -- | |
1537 | ----------------------------------- | |
1538 | ||
1539 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1540 | begin | |
1541 | Analyze (Explicit_Actual_Parameter (N)); | |
1542 | end Analyze_Parameter_Association; | |
1543 | ||
1544 | ---------------------------- | |
1545 | -- Analyze_Procedure_Call -- | |
1546 | ---------------------------- | |
1547 | ||
1548 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
996ae0b0 RK |
1549 | procedure Analyze_Call_And_Resolve; |
1550 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1551 | -- At end, check illegal order dependence. |
996ae0b0 | 1552 | |
fbf5a39b AC |
1553 | ------------------------------ |
1554 | -- Analyze_Call_And_Resolve -- | |
1555 | ------------------------------ | |
1556 | ||
996ae0b0 RK |
1557 | procedure Analyze_Call_And_Resolve is |
1558 | begin | |
1559 | if Nkind (N) = N_Procedure_Call_Statement then | |
1560 | Analyze_Call (N); | |
1561 | Resolve (N, Standard_Void_Type); | |
1562 | else | |
1563 | Analyze (N); | |
1564 | end if; | |
1565 | end Analyze_Call_And_Resolve; | |
1566 | ||
241ebe89 HK |
1567 | -- Local variables |
1568 | ||
1569 | Actuals : constant List_Id := Parameter_Associations (N); | |
1570 | Loc : constant Source_Ptr := Sloc (N); | |
1571 | P : constant Node_Id := Name (N); | |
1572 | Actual : Node_Id; | |
1573 | New_N : Node_Id; | |
1574 | ||
1af4455a HK |
1575 | Save_Ghost_Mode : constant Ghost_Mode_Type := Ghost_Mode; |
1576 | ||
996ae0b0 RK |
1577 | -- Start of processing for Analyze_Procedure_Call |
1578 | ||
1579 | begin | |
1580 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1581 | -- a procedure call or an entry call. The prefix may denote an access | |
1582 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1583 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1584 | -- then the construct denotes a call to a member of an entire family. |
1585 | -- If the prefix is a simple name, it may still denote a call to a | |
1586 | -- parameterless member of an entry family. Resolution of these various | |
1587 | -- interpretations is delicate. | |
1588 | ||
1589 | Analyze (P); | |
1590 | ||
758c442c GD |
1591 | -- If this is a call of the form Obj.Op, the call may have been |
1592 | -- analyzed and possibly rewritten into a block, in which case | |
1593 | -- we are done. | |
1594 | ||
1595 | if Analyzed (N) then | |
1596 | return; | |
1597 | end if; | |
1598 | ||
7415029d AC |
1599 | -- If there is an error analyzing the name (which may have been |
1600 | -- rewritten if the original call was in prefix notation) then error | |
1601 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1602 | |
21791d97 | 1603 | if Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
996ae0b0 RK |
1604 | Set_Etype (N, Any_Type); |
1605 | return; | |
1606 | end if; | |
1607 | ||
1af4455a HK |
1608 | -- A procedure call is Ghost when its name denotes a Ghost procedure. |
1609 | -- Set the mode now to ensure that any nodes generated during analysis | |
1610 | -- and expansion are properly marked as Ghost. | |
8636f52f HK |
1611 | |
1612 | Set_Ghost_Mode (N); | |
1613 | ||
996ae0b0 RK |
1614 | -- Otherwise analyze the parameters |
1615 | ||
1616 | if Present (Actuals) then | |
1617 | Actual := First (Actuals); | |
1618 | ||
1619 | while Present (Actual) loop | |
1620 | Analyze (Actual); | |
1621 | Check_Parameterless_Call (Actual); | |
1622 | Next (Actual); | |
1623 | end loop; | |
1624 | end if; | |
1625 | ||
0bfc9a64 | 1626 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1627 | |
1628 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a AC |
1629 | and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
1630 | Name_Elab_Body, | |
1631 | Name_Elab_Subp_Body) | |
996ae0b0 RK |
1632 | then |
1633 | if Present (Actuals) then | |
1634 | Error_Msg_N | |
1635 | ("no parameters allowed for this call", First (Actuals)); | |
1636 | return; | |
1637 | end if; | |
1638 | ||
1639 | Set_Etype (N, Standard_Void_Type); | |
1640 | Set_Analyzed (N); | |
1641 | ||
1642 | elsif Is_Entity_Name (P) | |
1643 | and then Is_Record_Type (Etype (Entity (P))) | |
1644 | and then Remote_AST_I_Dereference (P) | |
1645 | then | |
1af4455a | 1646 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 RK |
1647 | return; |
1648 | ||
1649 | elsif Is_Entity_Name (P) | |
1650 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1651 | then | |
1652 | if Is_Access_Type (Etype (P)) | |
1653 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1654 | and then No (Actuals) | |
1655 | and then Comes_From_Source (N) | |
1656 | then | |
ed2233dc | 1657 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1658 | end if; |
1659 | ||
1660 | Analyze_Call_And_Resolve; | |
1661 | ||
1662 | -- If the prefix is the simple name of an entry family, this is | |
1663 | -- a parameterless call from within the task body itself. | |
1664 | ||
1665 | elsif Is_Entity_Name (P) | |
1666 | and then Nkind (P) = N_Identifier | |
1667 | and then Ekind (Entity (P)) = E_Entry_Family | |
1668 | and then Present (Actuals) | |
1669 | and then No (Next (First (Actuals))) | |
1670 | then | |
82c80734 RD |
1671 | -- Can be call to parameterless entry family. What appears to be the |
1672 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1673 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1674 | -- transformation. |
1675 | ||
1676 | New_N := | |
1677 | Make_Indexed_Component (Loc, | |
1678 | Prefix => | |
1679 | Make_Selected_Component (Loc, | |
1680 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1681 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1682 | Expressions => Actuals); | |
1683 | Set_Name (N, New_N); | |
1684 | Set_Etype (New_N, Standard_Void_Type); | |
1685 | Set_Parameter_Associations (N, No_List); | |
1686 | Analyze_Call_And_Resolve; | |
1687 | ||
1688 | elsif Nkind (P) = N_Explicit_Dereference then | |
1689 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1690 | Analyze_Call_And_Resolve; | |
1691 | else | |
1692 | Error_Msg_N ("expect access to procedure in call", P); | |
1693 | end if; | |
1694 | ||
82c80734 RD |
1695 | -- The name can be a selected component or an indexed component that |
1696 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1697 | -- has parameter associations. | |
996ae0b0 RK |
1698 | |
1699 | elsif Is_Access_Type (Etype (P)) | |
1700 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1701 | then | |
1702 | if Present (Actuals) then | |
1703 | Analyze_Call_And_Resolve; | |
1704 | else | |
ed2233dc | 1705 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1706 | end if; |
1707 | ||
82c80734 RD |
1708 | -- If not an access to subprogram, then the prefix must resolve to the |
1709 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1710 | |
82c80734 RD |
1711 | -- For the case of a simple entry call, P is a selected component where |
1712 | -- the prefix is the task and the selector name is the entry. A call to | |
1713 | -- a protected procedure will have the same syntax. If the protected | |
1714 | -- object contains overloaded operations, the entity may appear as a | |
1715 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1716 | |
1717 | elsif Nkind (P) = N_Selected_Component | |
8fde064e AC |
1718 | and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
1719 | E_Procedure, | |
1720 | E_Function) | |
996ae0b0 RK |
1721 | then |
1722 | Analyze_Call_And_Resolve; | |
1723 | ||
1724 | elsif Nkind (P) = N_Selected_Component | |
1725 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1726 | and then Present (Actuals) | |
1727 | and then No (Next (First (Actuals))) | |
1728 | then | |
82c80734 RD |
1729 | -- Can be call to parameterless entry family. What appears to be the |
1730 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1731 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1732 | -- transformation. |
1733 | ||
1734 | New_N := | |
1735 | Make_Indexed_Component (Loc, | |
1736 | Prefix => New_Copy (P), | |
1737 | Expressions => Actuals); | |
1738 | Set_Name (N, New_N); | |
1739 | Set_Etype (New_N, Standard_Void_Type); | |
1740 | Set_Parameter_Associations (N, No_List); | |
1741 | Analyze_Call_And_Resolve; | |
1742 | ||
1743 | -- For the case of a reference to an element of an entry family, P is | |
1744 | -- an indexed component whose prefix is a selected component (task and | |
1745 | -- entry family), and whose index is the entry family index. | |
1746 | ||
1747 | elsif Nkind (P) = N_Indexed_Component | |
1748 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1749 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1750 | then | |
1751 | Analyze_Call_And_Resolve; | |
1752 | ||
1753 | -- If the prefix is the name of an entry family, it is a call from | |
1754 | -- within the task body itself. | |
1755 | ||
1756 | elsif Nkind (P) = N_Indexed_Component | |
1757 | and then Nkind (Prefix (P)) = N_Identifier | |
1758 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1759 | then | |
1760 | New_N := | |
1761 | Make_Selected_Component (Loc, | |
1762 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1763 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1764 | Rewrite (Prefix (P), New_N); | |
1765 | Analyze (P); | |
1766 | Analyze_Call_And_Resolve; | |
1767 | ||
9f8d1e5c AC |
1768 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
1769 | -- procedure name, so the construct can only be a qualified expression. | |
1770 | ||
1771 | elsif Nkind (P) = N_Qualified_Expression | |
1772 | and then Ada_Version >= Ada_2012 | |
1773 | then | |
1774 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
1775 | Analyze (N); | |
1776 | ||
e895b435 | 1777 | -- Anything else is an error |
996ae0b0 RK |
1778 | |
1779 | else | |
758c442c | 1780 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 | 1781 | end if; |
241ebe89 | 1782 | |
1af4455a | 1783 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 RK |
1784 | end Analyze_Procedure_Call; |
1785 | ||
b0186f71 AC |
1786 | ------------------------------ |
1787 | -- Analyze_Return_Statement -- | |
1788 | ------------------------------ | |
1789 | ||
1790 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1791 | ||
1792 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1793 | N_Extended_Return_Statement)); | |
1794 | ||
1795 | Returns_Object : constant Boolean := | |
1796 | Nkind (N) = N_Extended_Return_Statement | |
1797 | or else | |
8fde064e AC |
1798 | (Nkind (N) = N_Simple_Return_Statement |
1799 | and then Present (Expression (N))); | |
b0186f71 AC |
1800 | -- True if we're returning something; that is, "return <expression>;" |
1801 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1802 | -- checking: If Returns_Object is True, N should apply to a function | |
1803 | -- body; otherwise N should apply to a procedure body, entry body, | |
1804 | -- accept statement, or extended return statement. | |
1805 | ||
1806 | function Find_What_It_Applies_To return Entity_Id; | |
1807 | -- Find the entity representing the innermost enclosing body, accept | |
1808 | -- statement, or extended return statement. If the result is a callable | |
1809 | -- construct or extended return statement, then this will be the value | |
1810 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1811 | -- illegal. See RM-6.5(4/2). | |
1812 | ||
1813 | ----------------------------- | |
1814 | -- Find_What_It_Applies_To -- | |
1815 | ----------------------------- | |
1816 | ||
1817 | function Find_What_It_Applies_To return Entity_Id is | |
1818 | Result : Entity_Id := Empty; | |
1819 | ||
1820 | begin | |
36b8f95f AC |
1821 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1822 | -- and postconditions. | |
b0186f71 AC |
1823 | |
1824 | for J in reverse 0 .. Scope_Stack.Last loop | |
1825 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1826 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1827 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1828 | end loop; |
1829 | ||
1830 | pragma Assert (Present (Result)); | |
1831 | return Result; | |
1832 | end Find_What_It_Applies_To; | |
1833 | ||
1834 | -- Local declarations | |
1835 | ||
1836 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1837 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1838 | Loc : constant Source_Ptr := Sloc (N); | |
1839 | Stm_Entity : constant Entity_Id := | |
1840 | New_Internal_Entity | |
1841 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1842 | ||
1843 | -- Start of processing for Analyze_Return_Statement | |
1844 | ||
1845 | begin | |
1846 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1847 | ||
1848 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1849 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1850 | ||
1851 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1852 | -- (4/2): an inner return statement will apply to this extended return. | |
1853 | ||
1854 | if Nkind (N) = N_Extended_Return_Statement then | |
1855 | Push_Scope (Stm_Entity); | |
1856 | end if; | |
1857 | ||
1858 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1859 | -- implicitly-generated return that is placed at the end. | |
1860 | ||
1861 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1862 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1863 | end if; | |
1864 | ||
1865 | -- Warn on any unassigned OUT parameters if in procedure | |
1866 | ||
1867 | if Ekind (Scope_Id) = E_Procedure then | |
1868 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1869 | end if; | |
1870 | ||
1871 | -- Check that functions return objects, and other things do not | |
1872 | ||
1873 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1874 | if not Returns_Object then | |
1875 | Error_Msg_N ("missing expression in return from function", N); | |
1876 | end if; | |
1877 | ||
1878 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1879 | if Returns_Object then | |
1880 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1881 | end if; | |
1882 | ||
1883 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1884 | if Returns_Object then | |
1885 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1886 | Error_Msg_N ("entry body cannot return value", N); | |
1887 | else | |
1888 | Error_Msg_N ("accept statement cannot return value", N); | |
1889 | end if; | |
1890 | end if; | |
1891 | ||
1892 | elsif Kind = E_Return_Statement then | |
1893 | ||
1894 | -- We are nested within another return statement, which must be an | |
1895 | -- extended_return_statement. | |
1896 | ||
1897 | if Returns_Object then | |
d0dcb2b1 AC |
1898 | if Nkind (N) = N_Extended_Return_Statement then |
1899 | Error_Msg_N | |
cc96a1b8 | 1900 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
1901 | N); |
1902 | ||
1903 | -- Case of a simple return statement with a value inside extended | |
1904 | -- return statement. | |
1905 | ||
1906 | else | |
1907 | Error_Msg_N | |
3ccedacc AC |
1908 | ("return nested in extended return statement cannot return " |
1909 | & "value (use `RETURN;`)", N); | |
d0dcb2b1 | 1910 | end if; |
b0186f71 AC |
1911 | end if; |
1912 | ||
1913 | else | |
1914 | Error_Msg_N ("illegal context for return statement", N); | |
1915 | end if; | |
1916 | ||
1917 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1918 | Analyze_Function_Return (N); | |
1919 | ||
1920 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1921 | Set_Return_Present (Scope_Id); | |
1922 | end if; | |
1923 | ||
1924 | if Nkind (N) = N_Extended_Return_Statement then | |
1925 | End_Scope; | |
1926 | end if; | |
1927 | ||
1928 | Kill_Current_Values (Last_Assignment_Only => True); | |
1929 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
1930 | |
1931 | Analyze_Dimension (N); | |
b0186f71 AC |
1932 | end Analyze_Return_Statement; |
1933 | ||
5d37ba92 ES |
1934 | ------------------------------------- |
1935 | -- Analyze_Simple_Return_Statement -- | |
1936 | ------------------------------------- | |
ec4867fa | 1937 | |
5d37ba92 | 1938 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1939 | begin |
5d37ba92 ES |
1940 | if Present (Expression (N)) then |
1941 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1942 | end if; |
1943 | ||
5d37ba92 ES |
1944 | Analyze_Return_Statement (N); |
1945 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1946 | |
82c80734 RD |
1947 | ------------------------- |
1948 | -- Analyze_Return_Type -- | |
1949 | ------------------------- | |
1950 | ||
1951 | procedure Analyze_Return_Type (N : Node_Id) is | |
1952 | Designator : constant Entity_Id := Defining_Entity (N); | |
1953 | Typ : Entity_Id := Empty; | |
1954 | ||
1955 | begin | |
ec4867fa ES |
1956 | -- Normal case where result definition does not indicate an error |
1957 | ||
41251c60 JM |
1958 | if Result_Definition (N) /= Error then |
1959 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
ce5ba43a | 1960 | Check_SPARK_05_Restriction |
fe5d3068 | 1961 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1962 | |
b1c11e0e JM |
1963 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1964 | ||
1965 | declare | |
1966 | AD : constant Node_Id := | |
1967 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1968 | begin | |
1969 | if Present (AD) and then Protected_Present (AD) then | |
1970 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1971 | else | |
1972 | Typ := Access_Definition (N, Result_Definition (N)); | |
1973 | end if; | |
1974 | end; | |
1975 | ||
41251c60 JM |
1976 | Set_Parent (Typ, Result_Definition (N)); |
1977 | Set_Is_Local_Anonymous_Access (Typ); | |
1978 | Set_Etype (Designator, Typ); | |
1979 | ||
b66c3ff4 AC |
1980 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1981 | ||
1982 | Null_Exclusion_Static_Checks (N); | |
1983 | ||
41251c60 JM |
1984 | -- Subtype_Mark case |
1985 | ||
1986 | else | |
1987 | Find_Type (Result_Definition (N)); | |
1988 | Typ := Entity (Result_Definition (N)); | |
1989 | Set_Etype (Designator, Typ); | |
1990 | ||
2ba431e5 | 1991 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1992 | |
8fde064e | 1993 | if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
ce5ba43a | 1994 | Check_SPARK_05_Restriction |
fe5d3068 | 1995 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1996 | Result_Definition (N)); |
daec8eeb YM |
1997 | end if; |
1998 | ||
b66c3ff4 AC |
1999 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
2000 | ||
2001 | Null_Exclusion_Static_Checks (N); | |
2002 | ||
2003 | -- If a null exclusion is imposed on the result type, then create | |
2004 | -- a null-excluding itype (an access subtype) and use it as the | |
2005 | -- function's Etype. Note that the null exclusion checks are done | |
2006 | -- right before this, because they don't get applied to types that | |
2007 | -- do not come from source. | |
2008 | ||
8fde064e | 2009 | if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
b66c3ff4 AC |
2010 | Set_Etype (Designator, |
2011 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
2012 | (T => Typ, |
2013 | Related_Nod => N, | |
2014 | Scope_Id => Scope (Current_Scope))); | |
2015 | ||
2016 | -- The new subtype must be elaborated before use because | |
2017 | -- it is visible outside of the function. However its base | |
2018 | -- type may not be frozen yet, so the reference that will | |
2019 | -- force elaboration must be attached to the freezing of | |
2020 | -- the base type. | |
2021 | ||
212863c0 AC |
2022 | -- If the return specification appears on a proper body, |
2023 | -- the subtype will have been created already on the spec. | |
2024 | ||
ff7139c3 | 2025 | if Is_Frozen (Typ) then |
212863c0 AC |
2026 | if Nkind (Parent (N)) = N_Subprogram_Body |
2027 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
2028 | then | |
2029 | null; | |
2030 | else | |
2031 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
2032 | end if; | |
2033 | ||
ff7139c3 AC |
2034 | else |
2035 | Ensure_Freeze_Node (Typ); | |
2036 | ||
2037 | declare | |
212863c0 | 2038 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
2039 | begin |
2040 | Set_Itype (IR, Etype (Designator)); | |
2041 | Append_Freeze_Actions (Typ, New_List (IR)); | |
2042 | end; | |
2043 | end if; | |
2044 | ||
b66c3ff4 AC |
2045 | else |
2046 | Set_Etype (Designator, Typ); | |
2047 | end if; | |
2048 | ||
41251c60 JM |
2049 | if Ekind (Typ) = E_Incomplete_Type |
2050 | or else (Is_Class_Wide_Type (Typ) | |
4b6f99f5 | 2051 | and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
41251c60 | 2052 | then |
dd386db0 AC |
2053 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
2054 | -- parts. Untagged incomplete types are not allowed in bodies. | |
b973629e AC |
2055 | -- As a consequence, limited views cannot appear in a basic |
2056 | -- declaration that is itself within a body, because there is | |
2057 | -- no point at which the non-limited view will become visible. | |
dd386db0 AC |
2058 | |
2059 | if Ada_Version >= Ada_2012 then | |
b973629e AC |
2060 | if From_Limited_With (Typ) and then In_Package_Body then |
2061 | Error_Msg_NE | |
2062 | ("invalid use of incomplete type&", | |
3f80a182 | 2063 | Result_Definition (N), Typ); |
b973629e | 2064 | |
1ebc2612 AC |
2065 | -- The return type of a subprogram body cannot be of a |
2066 | -- formal incomplete type. | |
2067 | ||
2068 | elsif Is_Generic_Type (Typ) | |
2069 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2070 | then | |
2071 | Error_Msg_N | |
2072 | ("return type cannot be a formal incomplete type", | |
2073 | Result_Definition (N)); | |
2074 | ||
2075 | elsif Is_Class_Wide_Type (Typ) | |
2076 | and then Is_Generic_Type (Root_Type (Typ)) | |
2077 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2078 | then | |
2079 | Error_Msg_N | |
2080 | ("return type cannot be a formal incomplete type", | |
2081 | Result_Definition (N)); | |
2082 | ||
b973629e | 2083 | elsif Is_Tagged_Type (Typ) then |
dd386db0 AC |
2084 | null; |
2085 | ||
ed09416f AC |
2086 | -- Use is legal in a thunk generated for an operation |
2087 | -- inherited from a progenitor. | |
2088 | ||
2089 | elsif Is_Thunk (Designator) | |
2090 | and then Present (Non_Limited_View (Typ)) | |
2091 | then | |
2092 | null; | |
2093 | ||
5b6f12c7 | 2094 | elsif Nkind (Parent (N)) = N_Subprogram_Body |
31d922e3 AC |
2095 | or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
2096 | N_Entry_Body) | |
dd386db0 AC |
2097 | then |
2098 | Error_Msg_NE | |
2099 | ("invalid use of untagged incomplete type&", | |
2100 | Designator, Typ); | |
2101 | end if; | |
2102 | ||
63be2a5a | 2103 | -- The type must be completed in the current package. This |
31d922e3 | 2104 | -- is checked at the end of the package declaration when |
7b7a0c2b AC |
2105 | -- Taft-amendment types are identified. If the return type |
2106 | -- is class-wide, there is no required check, the type can | |
2107 | -- be a bona fide TAT. | |
63be2a5a AC |
2108 | |
2109 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 2110 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 2111 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
2112 | then |
2113 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
2114 | end if; | |
2115 | ||
dd386db0 AC |
2116 | else |
2117 | Error_Msg_NE | |
2118 | ("invalid use of incomplete type&", Designator, Typ); | |
2119 | end if; | |
41251c60 | 2120 | end if; |
82c80734 RD |
2121 | end if; |
2122 | ||
ec4867fa ES |
2123 | -- Case where result definition does indicate an error |
2124 | ||
82c80734 RD |
2125 | else |
2126 | Set_Etype (Designator, Any_Type); | |
2127 | end if; | |
2128 | end Analyze_Return_Type; | |
2129 | ||
996ae0b0 RK |
2130 | ----------------------------- |
2131 | -- Analyze_Subprogram_Body -- | |
2132 | ----------------------------- | |
2133 | ||
b1b543d2 BD |
2134 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
2135 | Loc : constant Source_Ptr := Sloc (N); | |
2136 | Body_Spec : constant Node_Id := Specification (N); | |
2137 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
2138 | ||
2139 | begin | |
2140 | if Debug_Flag_C then | |
2141 | Write_Str ("==> subprogram body "); | |
2142 | Write_Name (Chars (Body_Id)); | |
2143 | Write_Str (" from "); | |
2144 | Write_Location (Loc); | |
2145 | Write_Eol; | |
2146 | Indent; | |
2147 | end if; | |
2148 | ||
2149 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
2150 | ||
2151 | -- The real work is split out into the helper, so it can do "return;" | |
2152 | -- without skipping the debug output: | |
2153 | ||
2154 | Analyze_Subprogram_Body_Helper (N); | |
2155 | ||
2156 | if Debug_Flag_C then | |
2157 | Outdent; | |
2158 | Write_Str ("<== subprogram body "); | |
2159 | Write_Name (Chars (Body_Id)); | |
2160 | Write_Str (" from "); | |
2161 | Write_Location (Loc); | |
2162 | Write_Eol; | |
2163 | end if; | |
2164 | end Analyze_Subprogram_Body; | |
2165 | ||
ea3c0651 AC |
2166 | -------------------------------------- |
2167 | -- Analyze_Subprogram_Body_Contract -- | |
2168 | -------------------------------------- | |
2169 | ||
ab8843fa | 2170 | procedure Analyze_Subprogram_Body_Contract (Body_Id : Entity_Id) is |
caf07df9 AC |
2171 | Items : constant Node_Id := Contract (Body_Id); |
2172 | Mode : SPARK_Mode_Type; | |
2173 | Prag : Node_Id; | |
2174 | Prag_Nam : Name_Id; | |
2175 | Ref_Depends : Node_Id := Empty; | |
2176 | Ref_Global : Node_Id := Empty; | |
ea3c0651 | 2177 | |
caf07df9 AC |
2178 | begin |
2179 | -- When a subprogram body declaration is illegal, its defining entity is | |
2180 | -- left unanalyzed. There is nothing left to do in this case because the | |
2181 | -- body lacks a contract, or even a proper Ekind. | |
fc999c5d | 2182 | |
caf07df9 AC |
2183 | if Ekind (Body_Id) = E_Void then |
2184 | return; | |
2185 | end if; | |
c61ef416 | 2186 | |
caf07df9 AC |
2187 | -- Due to the timing of contract analysis, delayed pragmas may be |
2188 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
2189 | -- context. To remedy this, restore the original SPARK_Mode of the | |
2190 | -- related subprogram body. | |
ab8843fa | 2191 | |
caf07df9 | 2192 | Save_SPARK_Mode_And_Set (Body_Id, Mode); |
ab8843fa | 2193 | |
caf07df9 AC |
2194 | -- All subprograms carry a contract, but for some it is not significant |
2195 | -- and should not be processed. | |
c9d70ab1 | 2196 | |
caf07df9 AC |
2197 | if not Has_Significant_Contract (Body_Id) then |
2198 | null; | |
c9d70ab1 | 2199 | |
caf07df9 AC |
2200 | -- The subprogram body is a completion, analyze all delayed pragmas that |
2201 | -- apply. Note that when the body is stand alone, the pragmas are always | |
2202 | -- analyzed on the spot. | |
2c8d828a | 2203 | |
caf07df9 | 2204 | elsif Present (Items) then |
54e28df2 | 2205 | |
caf07df9 AC |
2206 | -- Locate and store pragmas Refined_Depends and Refined_Global since |
2207 | -- their order of analysis matters. | |
c9d70ab1 | 2208 | |
caf07df9 AC |
2209 | Prag := Classifications (Items); |
2210 | while Present (Prag) loop | |
2211 | Prag_Nam := Pragma_Name (Prag); | |
c9d70ab1 | 2212 | |
caf07df9 AC |
2213 | if Prag_Nam = Name_Refined_Depends then |
2214 | Ref_Depends := Prag; | |
2215 | ||
2216 | elsif Prag_Nam = Name_Refined_Global then | |
2217 | Ref_Global := Prag; | |
2218 | end if; | |
2219 | ||
2220 | Prag := Next_Pragma (Prag); | |
2221 | end loop; | |
ab8843fa | 2222 | |
c9d70ab1 AC |
2223 | -- Analyze Refined_Global first as Refined_Depends may mention items |
2224 | -- classified in the global refinement. | |
ab8843fa | 2225 | |
c9d70ab1 AC |
2226 | if Present (Ref_Global) then |
2227 | Analyze_Refined_Global_In_Decl_Part (Ref_Global); | |
c9d70ab1 | 2228 | end if; |
ab8843fa | 2229 | |
c9d70ab1 AC |
2230 | -- Refined_Depends must be analyzed after Refined_Global in order to |
2231 | -- see the modes of all global refinements. | |
2232 | ||
2233 | if Present (Ref_Depends) then | |
2234 | Analyze_Refined_Depends_In_Decl_Part (Ref_Depends); | |
ab8843fa | 2235 | end if; |
54e28df2 | 2236 | end if; |
c61ef416 | 2237 | |
c9d70ab1 AC |
2238 | -- Ensure that the contract cases or postconditions mention 'Result or |
2239 | -- define a post-state. | |
2240 | ||
2241 | Check_Result_And_Post_State (Body_Id); | |
2242 | ||
847d950d HK |
2243 | -- A stand alone non-volatile function body cannot have an effectively |
2244 | -- volatile formal parameter or return type (SPARK RM 7.1.3(9)). This | |
2245 | -- check is relevant only when SPARK_Mode is on as it is not a standard | |
2246 | -- legality rule. The check is performed here because Volatile_Function | |
2247 | -- is processed after the analysis of the related subprogram body. | |
2248 | ||
2249 | if SPARK_Mode = On | |
2250 | and then Ekind_In (Body_Id, E_Function, E_Generic_Function) | |
2251 | and then not Is_Volatile_Function (Body_Id) | |
2252 | then | |
2253 | Check_Nonvolatile_Function_Profile (Body_Id); | |
2254 | end if; | |
2255 | ||
fc999c5d RD |
2256 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
2257 | -- pragmas have been analyzed. | |
2258 | ||
c61ef416 | 2259 | Restore_SPARK_Mode (Mode); |
ea3c0651 AC |
2260 | end Analyze_Subprogram_Body_Contract; |
2261 | ||
b1b543d2 BD |
2262 | ------------------------------------ |
2263 | -- Analyze_Subprogram_Body_Helper -- | |
2264 | ------------------------------------ | |
2265 | ||
996ae0b0 RK |
2266 | -- This procedure is called for regular subprogram bodies, generic bodies, |
2267 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
2268 | -- specification matters, and is used to create a proper declaration for | |
2269 | -- the subprogram, or to perform conformance checks. | |
2270 | ||
b1b543d2 | 2271 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b | 2272 | Loc : constant Source_Ptr := Sloc (N); |
8d1fe980 | 2273 | Body_Spec : Node_Id := Specification (N); |
fbf5a39b AC |
2274 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); |
2275 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 2276 | Conformant : Boolean; |
21d27997 | 2277 | HSS : Node_Id; |
21d27997 RD |
2278 | Prot_Typ : Entity_Id := Empty; |
2279 | Spec_Id : Entity_Id; | |
2280 | Spec_Decl : Node_Id := Empty; | |
2281 | ||
2282 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
2283 | -- When we analyze a separate spec, the entity chain ends up containing | |
2284 | -- the formals, as well as any itypes generated during analysis of the | |
2285 | -- default expressions for parameters, or the arguments of associated | |
2286 | -- precondition/postcondition pragmas (which are analyzed in the context | |
2287 | -- of the spec since they have visibility on formals). | |
2288 | -- | |
2289 | -- These entities belong with the spec and not the body. However we do | |
2290 | -- the analysis of the body in the context of the spec (again to obtain | |
2291 | -- visibility to the formals), and all the entities generated during | |
2292 | -- this analysis end up also chained to the entity chain of the spec. | |
2293 | -- But they really belong to the body, and there is circuitry to move | |
2294 | -- them from the spec to the body. | |
2295 | -- | |
2296 | -- However, when we do this move, we don't want to move the real spec | |
2297 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
2298 | -- variable points to the last real spec entity, so we only move those | |
2299 | -- chained beyond that point. It is initialized to Empty to deal with | |
2300 | -- the case where there is no separate spec. | |
996ae0b0 | 2301 | |
ac072cb2 AC |
2302 | function Body_Has_Contract return Boolean; |
2303 | -- Check whether unanalyzed body has an aspect or pragma that may | |
1399d355 | 2304 | -- generate a SPARK contract. |
ac072cb2 | 2305 | |
8d1fe980 AC |
2306 | procedure Build_Subprogram_Declaration; |
2307 | -- Create a matching subprogram declaration for subprogram body N | |
2308 | ||
ec4867fa | 2309 | procedure Check_Anonymous_Return; |
e50e1c5e | 2310 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
2311 | -- or a type that contains tasks, we must create a master entity for |
2312 | -- the anonymous type, which typically will be used in an allocator | |
2313 | -- in the body of the function. | |
2314 | ||
e660dbf7 JM |
2315 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
2316 | -- Look ahead to recognize a pragma that may appear after the body. | |
2317 | -- If there is a previous spec, check that it appears in the same | |
2318 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
2319 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
2320 | -- If the body acts as a spec, and inlining is required, we create a | |
2321 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
2322 | -- If pragma does not appear after the body, check whether there is |
2323 | -- an inline pragma before any local declarations. | |
c37bb106 | 2324 | |
7665e4bd AC |
2325 | procedure Check_Missing_Return; |
2326 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
2327 | -- the warning checks implemented by Check_Returns. In formal mode, also |
2328 | -- verify that a function ends with a RETURN and that a procedure does | |
2329 | -- not contain any RETURN. | |
7665e4bd | 2330 | |
d44202ba HK |
2331 | function Disambiguate_Spec return Entity_Id; |
2332 | -- When a primitive is declared between the private view and the full | |
2333 | -- view of a concurrent type which implements an interface, a special | |
2334 | -- mechanism is used to find the corresponding spec of the primitive | |
2335 | -- body. | |
2336 | ||
5dcab3ca AC |
2337 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id); |
2338 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains | |
2339 | -- incomplete types coming from a limited context and swap their limited | |
2340 | -- views with the non-limited ones. | |
2341 | ||
d44202ba HK |
2342 | function Is_Private_Concurrent_Primitive |
2343 | (Subp_Id : Entity_Id) return Boolean; | |
2344 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
2345 | -- type that implements an interface and has a private view. | |
2346 | ||
76a69663 ES |
2347 | procedure Set_Trivial_Subprogram (N : Node_Id); |
2348 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
2349 | -- subprogram whose body is being analyzed. N is the statement node | |
2350 | -- causing the flag to be set, if the following statement is a return | |
2351 | -- of an entity, we mark the entity as set in source to suppress any | |
2352 | -- warning on the stylized use of function stubs with a dummy return. | |
2353 | ||
758c442c GD |
2354 | procedure Verify_Overriding_Indicator; |
2355 | -- If there was a previous spec, the entity has been entered in the | |
2356 | -- current scope previously. If the body itself carries an overriding | |
2357 | -- indicator, check that it is consistent with the known status of the | |
2358 | -- entity. | |
2359 | ||
ac072cb2 AC |
2360 | ----------------------- |
2361 | -- Body_Has_Contract -- | |
2362 | ----------------------- | |
2363 | ||
2364 | function Body_Has_Contract return Boolean is | |
8d1fe980 AC |
2365 | Decls : constant List_Id := Declarations (N); |
2366 | Item : Node_Id; | |
ac072cb2 AC |
2367 | |
2368 | begin | |
33398e3c | 2369 | -- Check for aspects that may generate a contract |
ac072cb2 AC |
2370 | |
2371 | if Present (Aspect_Specifications (N)) then | |
8d1fe980 AC |
2372 | Item := First (Aspect_Specifications (N)); |
2373 | while Present (Item) loop | |
33398e3c | 2374 | if Is_Subprogram_Contract_Annotation (Item) then |
ac072cb2 AC |
2375 | return True; |
2376 | end if; | |
2377 | ||
8d1fe980 | 2378 | Next (Item); |
ac072cb2 AC |
2379 | end loop; |
2380 | end if; | |
2381 | ||
1399d355 | 2382 | -- Check for pragmas that may generate a contract |
ac072cb2 AC |
2383 | |
2384 | if Present (Decls) then | |
8d1fe980 AC |
2385 | Item := First (Decls); |
2386 | while Present (Item) loop | |
2387 | if Nkind (Item) = N_Pragma | |
33398e3c | 2388 | and then Is_Subprogram_Contract_Annotation (Item) |
8d1fe980 AC |
2389 | then |
2390 | return True; | |
ac072cb2 AC |
2391 | end if; |
2392 | ||
8d1fe980 | 2393 | Next (Item); |
ac072cb2 AC |
2394 | end loop; |
2395 | end if; | |
2396 | ||
2397 | return False; | |
2398 | end Body_Has_Contract; | |
2399 | ||
8d1fe980 AC |
2400 | ---------------------------------- |
2401 | -- Build_Subprogram_Declaration -- | |
2402 | ---------------------------------- | |
2403 | ||
2404 | procedure Build_Subprogram_Declaration is | |
2405 | Asp : Node_Id; | |
2406 | Decl : Node_Id; | |
2407 | Subp_Decl : Node_Id; | |
2408 | ||
2409 | begin | |
2410 | -- Create a matching subprogram spec using the profile of the body. | |
2411 | -- The structure of the tree is identical, but has new entities for | |
2412 | -- the defining unit name and formal parameters. | |
2413 | ||
2414 | Subp_Decl := | |
2415 | Make_Subprogram_Declaration (Loc, | |
2416 | Specification => Copy_Subprogram_Spec (Body_Spec)); | |
2417 | ||
2418 | -- Relocate the aspects of the subprogram body to the new subprogram | |
2419 | -- spec because it acts as the initial declaration. | |
2420 | -- ??? what about pragmas | |
2421 | ||
2422 | Move_Aspects (N, To => Subp_Decl); | |
2423 | Insert_Before_And_Analyze (N, Subp_Decl); | |
2424 | ||
2425 | -- The analysis of the subprogram spec aspects may introduce pragmas | |
2426 | -- that need to be analyzed. | |
2427 | ||
2428 | Decl := Next (Subp_Decl); | |
2429 | while Present (Decl) loop | |
2430 | ||
2431 | -- Stop the search for pragmas once the body has been reached as | |
2432 | -- this terminates the region where pragmas may appear. | |
2433 | ||
2434 | if Decl = N then | |
2435 | exit; | |
2436 | ||
2437 | elsif Nkind (Decl) = N_Pragma then | |
2438 | Analyze (Decl); | |
2439 | end if; | |
2440 | ||
2441 | Next (Decl); | |
2442 | end loop; | |
2443 | ||
2444 | Spec_Id := Defining_Entity (Subp_Decl); | |
2445 | Set_Corresponding_Spec (N, Spec_Id); | |
2446 | ||
2447 | -- Mark the generated spec as a source construct to ensure that all | |
2448 | -- calls to it are properly registered in ALI files for GNATprove. | |
2449 | ||
2450 | Set_Comes_From_Source (Spec_Id, True); | |
2451 | ||
2452 | -- If aspect SPARK_Mode was specified on the body, it needs to be | |
2453 | -- repeated both on the generated spec and the body. | |
2454 | ||
2455 | Asp := Find_Aspect (Spec_Id, Aspect_SPARK_Mode); | |
2456 | ||
2457 | if Present (Asp) then | |
2458 | Asp := New_Copy_Tree (Asp); | |
2459 | Set_Analyzed (Asp, False); | |
2460 | Set_Aspect_Specifications (N, New_List (Asp)); | |
2461 | end if; | |
2462 | ||
2463 | -- Ensure that the specs of the subprogram declaration and its body | |
2464 | -- are identical, otherwise they will appear non-conformant due to | |
2465 | -- rewritings in the default values of formal parameters. | |
2466 | ||
2467 | Body_Spec := Copy_Subprogram_Spec (Body_Spec); | |
2468 | Set_Specification (N, Body_Spec); | |
2469 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); | |
2470 | end Build_Subprogram_Declaration; | |
2471 | ||
ec4867fa ES |
2472 | ---------------------------- |
2473 | -- Check_Anonymous_Return -- | |
2474 | ---------------------------- | |
2475 | ||
2476 | procedure Check_Anonymous_Return is | |
2477 | Decl : Node_Id; | |
a523b302 | 2478 | Par : Node_Id; |
ec4867fa ES |
2479 | Scop : Entity_Id; |
2480 | ||
2481 | begin | |
2482 | if Present (Spec_Id) then | |
2483 | Scop := Spec_Id; | |
2484 | else | |
2485 | Scop := Body_Id; | |
2486 | end if; | |
2487 | ||
2488 | if Ekind (Scop) = E_Function | |
2489 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 | 2490 | and then not Is_Thunk (Scop) |
4b963531 AC |
2491 | |
2492 | -- Skip internally built functions which handle the case of | |
2493 | -- a null access (see Expand_Interface_Conversion) | |
2494 | ||
2495 | and then not (Is_Interface (Designated_Type (Etype (Scop))) | |
4b6f99f5 | 2496 | and then not Comes_From_Source (Parent (Scop))) |
4b963531 | 2497 | |
a523b302 JM |
2498 | and then (Has_Task (Designated_Type (Etype (Scop))) |
2499 | or else | |
4b6f99f5 RD |
2500 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) |
2501 | and then | |
2502 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 2503 | and then Expander_Active |
b20de9b9 | 2504 | |
8fde064e | 2505 | -- Avoid cases with no tasking support |
b20de9b9 AC |
2506 | |
2507 | and then RTE_Available (RE_Current_Master) | |
2508 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
2509 | then |
2510 | Decl := | |
2511 | Make_Object_Declaration (Loc, | |
2512 | Defining_Identifier => | |
2513 | Make_Defining_Identifier (Loc, Name_uMaster), | |
2514 | Constant_Present => True, | |
2515 | Object_Definition => | |
e4494292 | 2516 | New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
ec4867fa ES |
2517 | Expression => |
2518 | Make_Explicit_Dereference (Loc, | |
e4494292 | 2519 | New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
ec4867fa ES |
2520 | |
2521 | if Present (Declarations (N)) then | |
2522 | Prepend (Decl, Declarations (N)); | |
2523 | else | |
2524 | Set_Declarations (N, New_List (Decl)); | |
2525 | end if; | |
2526 | ||
2527 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
2528 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
2529 | |
2530 | -- Now mark the containing scope as a task master | |
2531 | ||
2532 | Par := N; | |
2533 | while Nkind (Par) /= N_Compilation_Unit loop | |
2534 | Par := Parent (Par); | |
2535 | pragma Assert (Present (Par)); | |
2536 | ||
2537 | -- If we fall off the top, we are at the outer level, and | |
2538 | -- the environment task is our effective master, so nothing | |
2539 | -- to mark. | |
2540 | ||
2541 | if Nkind_In | |
2542 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
2543 | then | |
2544 | Set_Is_Task_Master (Par, True); | |
2545 | exit; | |
2546 | end if; | |
2547 | end loop; | |
ec4867fa ES |
2548 | end if; |
2549 | end Check_Anonymous_Return; | |
2550 | ||
e660dbf7 JM |
2551 | ------------------------- |
2552 | -- Check_Inline_Pragma -- | |
2553 | ------------------------- | |
758c442c | 2554 | |
e660dbf7 JM |
2555 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
2556 | Prag : Node_Id; | |
2557 | Plist : List_Id; | |
0fb2ea01 | 2558 | |
21d27997 | 2559 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 2560 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 2561 | -- to this subprogram. |
21d27997 RD |
2562 | |
2563 | ----------------------- | |
2564 | -- Is_Inline_Pragma -- | |
2565 | ----------------------- | |
2566 | ||
2567 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
2568 | begin | |
2569 | return | |
2570 | Nkind (N) = N_Pragma | |
2571 | and then | |
8fde064e | 2572 | (Pragma_Name (N) = Name_Inline_Always |
4b6f99f5 RD |
2573 | or else (Front_End_Inlining |
2574 | and then Pragma_Name (N) = Name_Inline)) | |
21d27997 | 2575 | and then |
8fde064e AC |
2576 | Chars |
2577 | (Expression (First (Pragma_Argument_Associations (N)))) = | |
2578 | Chars (Body_Id); | |
21d27997 RD |
2579 | end Is_Inline_Pragma; |
2580 | ||
2581 | -- Start of processing for Check_Inline_Pragma | |
2582 | ||
c37bb106 | 2583 | begin |
e660dbf7 JM |
2584 | if not Expander_Active then |
2585 | return; | |
2586 | end if; | |
2587 | ||
2588 | if Is_List_Member (N) | |
2589 | and then Present (Next (N)) | |
21d27997 | 2590 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2591 | then |
2592 | Prag := Next (N); | |
2593 | ||
21d27997 RD |
2594 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2595 | and then Present (Declarations (N)) | |
2596 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2597 | then | |
2598 | Prag := First (Declarations (N)); | |
2599 | ||
e660dbf7 JM |
2600 | else |
2601 | Prag := Empty; | |
c37bb106 | 2602 | end if; |
e660dbf7 JM |
2603 | |
2604 | if Present (Prag) then | |
2605 | if Present (Spec_Id) then | |
30196a76 | 2606 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
2607 | Analyze (Prag); |
2608 | end if; | |
2609 | ||
2610 | else | |
d39d6bb8 | 2611 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
2612 | |
2613 | declare | |
2614 | Subp : constant Entity_Id := | |
30196a76 | 2615 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 2616 | Decl : constant Node_Id := |
30196a76 RD |
2617 | Make_Subprogram_Declaration (Loc, |
2618 | Specification => | |
2619 | New_Copy_Tree (Specification (N))); | |
2620 | ||
e660dbf7 JM |
2621 | begin |
2622 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
2623 | ||
2624 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 2625 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2626 | Set_Parameter_Specifications |
2627 | (Specification (Decl), Plist); | |
2628 | end if; | |
2629 | ||
2630 | Insert_Before (N, Decl); | |
2631 | Analyze (Decl); | |
2632 | Analyze (Prag); | |
2633 | Set_Has_Pragma_Inline (Subp); | |
2634 | ||
76a69663 | 2635 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2636 | Set_Is_Inlined (Subp); |
21d27997 | 2637 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2638 | end if; |
2639 | ||
158d55fa AC |
2640 | -- Prior to copying the subprogram body to create a template |
2641 | -- for it for subsequent inlining, remove the pragma from | |
2642 | -- the current body so that the copy that will produce the | |
2643 | -- new body will start from a completely unanalyzed tree. | |
2644 | ||
2645 | if Nkind (Parent (Prag)) = N_Subprogram_Body then | |
2646 | Rewrite (Prag, Make_Null_Statement (Sloc (Prag))); | |
2647 | end if; | |
2648 | ||
e660dbf7 JM |
2649 | Spec := Subp; |
2650 | end; | |
2651 | end if; | |
2652 | end if; | |
2653 | end Check_Inline_Pragma; | |
2654 | ||
7665e4bd AC |
2655 | -------------------------- |
2656 | -- Check_Missing_Return -- | |
2657 | -------------------------- | |
2658 | ||
2659 | procedure Check_Missing_Return is | |
2660 | Id : Entity_Id; | |
2661 | Missing_Ret : Boolean; | |
2662 | ||
2663 | begin | |
2664 | if Nkind (Body_Spec) = N_Function_Specification then | |
2665 | if Present (Spec_Id) then | |
2666 | Id := Spec_Id; | |
2667 | else | |
2668 | Id := Body_Id; | |
2669 | end if; | |
2670 | ||
fe5d3068 | 2671 | if Return_Present (Id) then |
7665e4bd AC |
2672 | Check_Returns (HSS, 'F', Missing_Ret); |
2673 | ||
2674 | if Missing_Ret then | |
2675 | Set_Has_Missing_Return (Id); | |
2676 | end if; | |
2677 | ||
2aca76d6 AC |
2678 | elsif Is_Generic_Subprogram (Id) |
2679 | or else not Is_Machine_Code_Subprogram (Id) | |
7665e4bd AC |
2680 | then |
2681 | Error_Msg_N ("missing RETURN statement in function body", N); | |
2682 | end if; | |
2683 | ||
fe5d3068 | 2684 | -- If procedure with No_Return, check returns |
607d0635 | 2685 | |
fe5d3068 YM |
2686 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
2687 | and then Present (Spec_Id) | |
2688 | and then No_Return (Spec_Id) | |
607d0635 | 2689 | then |
fe5d3068 YM |
2690 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
2691 | end if; | |
2692 | ||
ad05f2e9 | 2693 | -- Special checks in SPARK mode |
fe5d3068 YM |
2694 | |
2695 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 2696 | |
ad05f2e9 | 2697 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
2698 | |
2699 | declare | |
2700 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
2701 | begin | |
2702 | if Present (Stat) | |
7394c8cc AC |
2703 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
2704 | N_Extended_Return_Statement) | |
fe5d3068 | 2705 | then |
ce5ba43a | 2706 | Check_SPARK_05_Restriction |
fe5d3068 YM |
2707 | ("last statement in function should be RETURN", Stat); |
2708 | end if; | |
2709 | end; | |
2710 | ||
ad05f2e9 | 2711 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
2712 | |
2713 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
2714 | if Present (Spec_Id) then |
2715 | Id := Spec_Id; | |
2716 | else | |
2717 | Id := Body_Id; | |
2718 | end if; | |
2719 | ||
8d606a78 RD |
2720 | -- Would be nice to point to return statement here, can we |
2721 | -- borrow the Check_Returns procedure here ??? | |
2722 | ||
607d0635 | 2723 | if Return_Present (Id) then |
ce5ba43a | 2724 | Check_SPARK_05_Restriction |
fe5d3068 | 2725 | ("procedure should not have RETURN", N); |
607d0635 | 2726 | end if; |
7665e4bd AC |
2727 | end if; |
2728 | end Check_Missing_Return; | |
2729 | ||
d44202ba HK |
2730 | ----------------------- |
2731 | -- Disambiguate_Spec -- | |
2732 | ----------------------- | |
2733 | ||
2734 | function Disambiguate_Spec return Entity_Id is | |
2735 | Priv_Spec : Entity_Id; | |
2736 | Spec_N : Entity_Id; | |
2737 | ||
2738 | procedure Replace_Types (To_Corresponding : Boolean); | |
2739 | -- Depending on the flag, replace the type of formal parameters of | |
2740 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2741 | -- the corresponding record type or the other way around. | |
2742 | ||
2743 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2744 | Formal : Entity_Id; | |
2745 | Formal_Typ : Entity_Id; | |
2746 | ||
2747 | begin | |
2748 | Formal := First_Formal (Body_Id); | |
2749 | while Present (Formal) loop | |
2750 | Formal_Typ := Etype (Formal); | |
2751 | ||
df3e68b1 HK |
2752 | if Is_Class_Wide_Type (Formal_Typ) then |
2753 | Formal_Typ := Root_Type (Formal_Typ); | |
2754 | end if; | |
2755 | ||
d44202ba HK |
2756 | -- From concurrent type to corresponding record |
2757 | ||
2758 | if To_Corresponding then | |
2759 | if Is_Concurrent_Type (Formal_Typ) | |
2760 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4b6f99f5 RD |
2761 | and then |
2762 | Present (Interfaces | |
2763 | (Corresponding_Record_Type (Formal_Typ))) | |
d44202ba HK |
2764 | then |
2765 | Set_Etype (Formal, | |
2766 | Corresponding_Record_Type (Formal_Typ)); | |
2767 | end if; | |
2768 | ||
2769 | -- From corresponding record to concurrent type | |
2770 | ||
2771 | else | |
2772 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2773 | and then Present (Interfaces (Formal_Typ)) | |
2774 | then | |
2775 | Set_Etype (Formal, | |
2776 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2777 | end if; | |
2778 | end if; | |
2779 | ||
2780 | Next_Formal (Formal); | |
2781 | end loop; | |
2782 | end Replace_Types; | |
2783 | ||
2784 | -- Start of processing for Disambiguate_Spec | |
2785 | ||
2786 | begin | |
2787 | -- Try to retrieve the specification of the body as is. All error | |
2788 | -- messages are suppressed because the body may not have a spec in | |
2789 | -- its current state. | |
2790 | ||
2791 | Spec_N := Find_Corresponding_Spec (N, False); | |
2792 | ||
2793 | -- It is possible that this is the body of a primitive declared | |
2794 | -- between a private and a full view of a concurrent type. The | |
2795 | -- controlling parameter of the spec carries the concurrent type, | |
2796 | -- not the corresponding record type as transformed by Analyze_ | |
2797 | -- Subprogram_Specification. In such cases, we undo the change | |
2798 | -- made by the analysis of the specification and try to find the | |
2799 | -- spec again. | |
766d7add | 2800 | |
8198b93d HK |
2801 | -- Note that wrappers already have their corresponding specs and |
2802 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2803 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2804 | -- original concurrent status. |
d44202ba | 2805 | |
8198b93d HK |
2806 | if No (Spec_N) |
2807 | or else Is_Primitive_Wrapper (Spec_N) | |
2808 | then | |
d44202ba HK |
2809 | -- Restore all references of corresponding record types to the |
2810 | -- original concurrent types. | |
2811 | ||
2812 | Replace_Types (To_Corresponding => False); | |
2813 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2814 | ||
2815 | -- The current body truly belongs to a primitive declared between | |
2816 | -- a private and a full view. We leave the modified body as is, | |
2817 | -- and return the true spec. | |
2818 | ||
2819 | if Present (Priv_Spec) | |
2820 | and then Is_Private_Primitive (Priv_Spec) | |
2821 | then | |
2822 | return Priv_Spec; | |
2823 | end if; | |
2824 | ||
2825 | -- In case that this is some sort of error, restore the original | |
2826 | -- state of the body. | |
2827 | ||
2828 | Replace_Types (To_Corresponding => True); | |
2829 | end if; | |
2830 | ||
2831 | return Spec_N; | |
2832 | end Disambiguate_Spec; | |
2833 | ||
5dcab3ca AC |
2834 | ---------------------------- |
2835 | -- Exchange_Limited_Views -- | |
2836 | ---------------------------- | |
2837 | ||
2838 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id) is | |
2839 | procedure Detect_And_Exchange (Id : Entity_Id); | |
2840 | -- Determine whether Id's type denotes an incomplete type associated | |
2841 | -- with a limited with clause and exchange the limited view with the | |
167b47d9 | 2842 | -- non-limited one when available. |
5dcab3ca AC |
2843 | |
2844 | ------------------------- | |
2845 | -- Detect_And_Exchange -- | |
2846 | ------------------------- | |
2847 | ||
2848 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
2849 | Typ : constant Entity_Id := Etype (Id); | |
5dcab3ca | 2850 | begin |
ccd6f414 | 2851 | if From_Limited_With (Typ) and then Has_Non_Limited_View (Typ) then |
5dcab3ca AC |
2852 | Set_Etype (Id, Non_Limited_View (Typ)); |
2853 | end if; | |
2854 | end Detect_And_Exchange; | |
2855 | ||
2856 | -- Local variables | |
2857 | ||
2858 | Formal : Entity_Id; | |
2859 | ||
2860 | -- Start of processing for Exchange_Limited_Views | |
2861 | ||
2862 | begin | |
2863 | if No (Subp_Id) then | |
2864 | return; | |
2865 | ||
2866 | -- Do not process subprogram bodies as they already use the non- | |
2867 | -- limited view of types. | |
2868 | ||
2869 | elsif not Ekind_In (Subp_Id, E_Function, E_Procedure) then | |
2870 | return; | |
2871 | end if; | |
2872 | ||
2873 | -- Examine all formals and swap views when applicable | |
2874 | ||
2875 | Formal := First_Formal (Subp_Id); | |
2876 | while Present (Formal) loop | |
2877 | Detect_And_Exchange (Formal); | |
2878 | ||
2879 | Next_Formal (Formal); | |
2880 | end loop; | |
2881 | ||
2882 | -- Process the return type of a function | |
2883 | ||
2884 | if Ekind (Subp_Id) = E_Function then | |
2885 | Detect_And_Exchange (Subp_Id); | |
2886 | end if; | |
2887 | end Exchange_Limited_Views; | |
2888 | ||
d44202ba HK |
2889 | ------------------------------------- |
2890 | -- Is_Private_Concurrent_Primitive -- | |
2891 | ------------------------------------- | |
2892 | ||
2893 | function Is_Private_Concurrent_Primitive | |
2894 | (Subp_Id : Entity_Id) return Boolean | |
2895 | is | |
2896 | Formal_Typ : Entity_Id; | |
2897 | ||
2898 | begin | |
2899 | if Present (First_Formal (Subp_Id)) then | |
2900 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2901 | ||
2902 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2903 | if Is_Class_Wide_Type (Formal_Typ) then |
2904 | Formal_Typ := Root_Type (Formal_Typ); | |
2905 | end if; | |
2906 | ||
d44202ba HK |
2907 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2908 | end if; | |
2909 | ||
2910 | -- The type of the first formal is a concurrent tagged type with | |
2911 | -- a private view. | |
2912 | ||
2913 | return | |
2914 | Is_Concurrent_Type (Formal_Typ) | |
2915 | and then Is_Tagged_Type (Formal_Typ) | |
2916 | and then Has_Private_Declaration (Formal_Typ); | |
2917 | end if; | |
2918 | ||
2919 | return False; | |
2920 | end Is_Private_Concurrent_Primitive; | |
2921 | ||
76a69663 ES |
2922 | ---------------------------- |
2923 | -- Set_Trivial_Subprogram -- | |
2924 | ---------------------------- | |
2925 | ||
2926 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2927 | Nxt : constant Node_Id := Next (N); | |
2928 | ||
2929 | begin | |
2930 | Set_Is_Trivial_Subprogram (Body_Id); | |
2931 | ||
2932 | if Present (Spec_Id) then | |
2933 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2934 | end if; | |
2935 | ||
2936 | if Present (Nxt) | |
2937 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2938 | and then No (Next (Nxt)) | |
2939 | and then Present (Expression (Nxt)) | |
2940 | and then Is_Entity_Name (Expression (Nxt)) | |
2941 | then | |
2942 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2943 | end if; | |
2944 | end Set_Trivial_Subprogram; | |
2945 | ||
758c442c GD |
2946 | --------------------------------- |
2947 | -- Verify_Overriding_Indicator -- | |
2948 | --------------------------------- | |
2949 | ||
2950 | procedure Verify_Overriding_Indicator is | |
2951 | begin | |
21d27997 RD |
2952 | if Must_Override (Body_Spec) then |
2953 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
4b6f99f5 | 2954 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 RD |
2955 | then |
2956 | null; | |
2957 | ||
038140ed | 2958 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2959 | Error_Msg_NE |
21d27997 | 2960 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
23e28b42 AC |
2961 | |
2962 | -- Overriding indicators aren't allowed for protected subprogram | |
2963 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
2964 | -- this to a warning if -gnatd.E is enabled. | |
2965 | ||
2966 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
2967 | Error_Msg_Warn := Error_To_Warning; | |
2968 | Error_Msg_N | |
b785e0b8 | 2969 | ("<<overriding indicator not allowed for protected " |
23e28b42 | 2970 | & "subprogram body", Body_Spec); |
21d27997 | 2971 | end if; |
758c442c | 2972 | |
5d37ba92 | 2973 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2974 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2975 | Error_Msg_NE |
5d37ba92 | 2976 | ("subprogram& overrides inherited operation", |
76a69663 | 2977 | Body_Spec, Spec_Id); |
5d37ba92 | 2978 | |
21d27997 | 2979 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
4b6f99f5 | 2980 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 | 2981 | then |
ed2233dc | 2982 | Error_Msg_NE |
3ccedacc | 2983 | ("subprogram& overrides predefined operator ", |
21d27997 RD |
2984 | Body_Spec, Spec_Id); |
2985 | ||
23e28b42 AC |
2986 | -- Overriding indicators aren't allowed for protected subprogram |
2987 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
2988 | -- this to a warning if -gnatd.E is enabled. | |
2989 | ||
2990 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
2991 | Error_Msg_Warn := Error_To_Warning; | |
5d37ba92 | 2992 | |
23e28b42 | 2993 | Error_Msg_N |
3ccedacc AC |
2994 | ("<<overriding indicator not allowed " |
2995 | & "for protected subprogram body", Body_Spec); | |
23e28b42 AC |
2996 | |
2997 | -- If this is not a primitive operation, then the overriding | |
2998 | -- indicator is altogether illegal. | |
2999 | ||
3000 | elsif not Is_Primitive (Spec_Id) then | |
ed2233dc | 3001 | Error_Msg_N |
3ccedacc AC |
3002 | ("overriding indicator only allowed " |
3003 | & "if subprogram is primitive", Body_Spec); | |
5d37ba92 | 3004 | end if; |
235f4375 | 3005 | |
23e28b42 AC |
3006 | -- If checking the style rule and the operation overrides, then |
3007 | -- issue a warning about a missing overriding_indicator. Protected | |
3008 | -- subprogram bodies are excluded from this style checking, since | |
3009 | -- they aren't primitives (even though their declarations can | |
3010 | -- override) and aren't allowed to have an overriding_indicator. | |
3011 | ||
806f6d37 | 3012 | elsif Style_Check |
038140ed | 3013 | and then Present (Overridden_Operation (Spec_Id)) |
23e28b42 | 3014 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type |
235f4375 AC |
3015 | then |
3016 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3017 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
3018 | |
3019 | elsif Style_Check | |
3020 | and then Can_Override_Operator (Spec_Id) | |
3021 | and then not Is_Predefined_File_Name | |
3022 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
3023 | then | |
3024 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3025 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
3026 | end if; |
3027 | end Verify_Overriding_Indicator; | |
3028 | ||
1af4455a HK |
3029 | -- Local variables |
3030 | ||
3031 | Save_Ghost_Mode : constant Ghost_Mode_Type := Ghost_Mode; | |
3032 | ||
b1b543d2 | 3033 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 3034 | |
996ae0b0 | 3035 | begin |
82c80734 RD |
3036 | -- Generic subprograms are handled separately. They always have a |
3037 | -- generic specification. Determine whether current scope has a | |
3038 | -- previous declaration. | |
996ae0b0 | 3039 | |
82c80734 RD |
3040 | -- If the subprogram body is defined within an instance of the same |
3041 | -- name, the instance appears as a package renaming, and will be hidden | |
3042 | -- within the subprogram. | |
996ae0b0 RK |
3043 | |
3044 | if Present (Prev_Id) | |
3045 | and then not Is_Overloadable (Prev_Id) | |
3046 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
3047 | or else Comes_From_Source (Prev_Id)) | |
3048 | then | |
fbf5a39b | 3049 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 | 3050 | Spec_Id := Prev_Id; |
8636f52f | 3051 | |
1af4455a HK |
3052 | -- A subprogram body is Ghost when it is stand alone and subject |
3053 | -- to pragma Ghost or when the corresponding spec is Ghost. Set | |
3054 | -- the mode now to ensure that any nodes generated during analysis | |
3055 | -- and expansion are properly marked as Ghost. | |
8636f52f HK |
3056 | |
3057 | Set_Ghost_Mode (N, Spec_Id); | |
996ae0b0 RK |
3058 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); |
3059 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3060 | ||
3061 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
3062 | |
3063 | if Nkind (N) = N_Subprogram_Body then | |
3064 | HSS := Handled_Statement_Sequence (N); | |
3065 | Check_Missing_Return; | |
3066 | end if; | |
3067 | ||
1af4455a | 3068 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 RK |
3069 | return; |
3070 | ||
3071 | else | |
82c80734 RD |
3072 | -- Previous entity conflicts with subprogram name. Attempting to |
3073 | -- enter name will post error. | |
996ae0b0 RK |
3074 | |
3075 | Enter_Name (Body_Id); | |
1af4455a | 3076 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 RK |
3077 | return; |
3078 | end if; | |
3079 | ||
82c80734 RD |
3080 | -- Non-generic case, find the subprogram declaration, if one was seen, |
3081 | -- or enter new overloaded entity in the current scope. If the | |
3082 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
3083 | -- part of the context of one of its subunits. No need to redo the | |
3084 | -- analysis. | |
996ae0b0 | 3085 | |
8fde064e | 3086 | elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
1af4455a | 3087 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 RK |
3088 | return; |
3089 | ||
3090 | else | |
fbf5a39b | 3091 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
3092 | |
3093 | if Nkind (N) = N_Subprogram_Body_Stub | |
3094 | or else No (Corresponding_Spec (N)) | |
3095 | then | |
d44202ba HK |
3096 | if Is_Private_Concurrent_Primitive (Body_Id) then |
3097 | Spec_Id := Disambiguate_Spec; | |
8636f52f | 3098 | |
1af4455a HK |
3099 | -- A subprogram body is Ghost when it is stand alone and |
3100 | -- subject to pragma Ghost or when the corresponding spec is | |
3101 | -- Ghost. Set the mode now to ensure that any nodes generated | |
3102 | -- during analysis and expansion are properly marked as Ghost. | |
8636f52f HK |
3103 | |
3104 | Set_Ghost_Mode (N, Spec_Id); | |
3105 | ||
d44202ba HK |
3106 | else |
3107 | Spec_Id := Find_Corresponding_Spec (N); | |
b6c8e5be | 3108 | |
1af4455a HK |
3109 | -- A subprogram body is Ghost when it is stand alone and |
3110 | -- subject to pragma Ghost or when the corresponding spec is | |
3111 | -- Ghost. Set the mode now to ensure that any nodes generated | |
3112 | -- during analysis and expansion are properly marked as Ghost. | |
8636f52f HK |
3113 | |
3114 | Set_Ghost_Mode (N, Spec_Id); | |
3115 | ||
b6c8e5be AC |
3116 | -- In GNATprove mode, if the body has no previous spec, create |
3117 | -- one so that the inlining machinery can operate properly. | |
3118 | -- Transfer aspects, if any, to the new spec, so that they | |
3119 | -- are legal and can be processed ahead of the body. | |
3120 | -- We make two copies of the given spec, one for the new | |
3121 | -- declaration, and one for the body. | |
3122 | ||
5a271a7f | 3123 | if No (Spec_Id) and then GNATprove_Mode |
480156b2 | 3124 | |
480156b2 AC |
3125 | -- Inlining does not apply during pre-analysis of code |
3126 | ||
b6c8e5be | 3127 | and then Full_Analysis |
480156b2 AC |
3128 | |
3129 | -- Inlining only applies to full bodies, not stubs | |
3130 | ||
7b2888e6 | 3131 | and then Nkind (N) /= N_Subprogram_Body_Stub |
480156b2 AC |
3132 | |
3133 | -- Inlining only applies to bodies in the source code, not to | |
3134 | -- those generated by the compiler. In particular, expression | |
3135 | -- functions, whose body is generated by the compiler, are | |
3136 | -- treated specially by GNATprove. | |
3137 | ||
b6c8e5be | 3138 | and then Comes_From_Source (Body_Id) |
480156b2 AC |
3139 | |
3140 | -- This cannot be done for a compilation unit, which is not | |
3141 | -- in a context where we can insert a new spec. | |
3142 | ||
b6c8e5be | 3143 | and then Is_List_Member (N) |
480156b2 AC |
3144 | |
3145 | -- Inlining only applies to subprograms without contracts, | |
3146 | -- as a contract is a sign that GNATprove should perform a | |
3147 | -- modular analysis of the subprogram instead of a contextual | |
3148 | -- analysis at each call site. The same test is performed in | |
3149 | -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated | |
3150 | -- here in another form (because the contract has not | |
3151 | -- been attached to the body) to avoid frontend errors in | |
3152 | -- case pragmas are used instead of aspects, because the | |
3153 | -- corresponding pragmas in the body would not be transferred | |
3154 | -- to the spec, leading to legality errors. | |
3155 | ||
ac072cb2 | 3156 | and then not Body_Has_Contract |
8d1fe980 | 3157 | and then not Inside_A_Generic |
b6c8e5be | 3158 | then |
8d1fe980 | 3159 | Build_Subprogram_Declaration; |
b6c8e5be | 3160 | end if; |
d44202ba | 3161 | end if; |
996ae0b0 RK |
3162 | |
3163 | -- If this is a duplicate body, no point in analyzing it | |
3164 | ||
3165 | if Error_Posted (N) then | |
1af4455a | 3166 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 RK |
3167 | return; |
3168 | end if; | |
3169 | ||
82c80734 RD |
3170 | -- A subprogram body should cause freezing of its own declaration, |
3171 | -- but if there was no previous explicit declaration, then the | |
3172 | -- subprogram will get frozen too late (there may be code within | |
3173 | -- the body that depends on the subprogram having been frozen, | |
3174 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 3175 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
3176 | -- Finally, if the return type is an anonymous access to protected |
3177 | -- subprogram, it must be frozen before the body because its | |
3178 | -- expansion has generated an equivalent type that is used when | |
3179 | -- elaborating the body. | |
996ae0b0 | 3180 | |
885c4871 | 3181 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
3182 | -- created for expression functions do not freeze. |
3183 | ||
3184 | if No (Spec_Id) | |
3185 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
3186 | then | |
996ae0b0 RK |
3187 | Freeze_Before (N, Body_Id); |
3188 | ||
3189 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
3190 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
3191 | |
3192 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
3193 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 3194 | end if; |
a38ff9b1 | 3195 | |
996ae0b0 RK |
3196 | else |
3197 | Spec_Id := Corresponding_Spec (N); | |
8636f52f | 3198 | |
1af4455a HK |
3199 | -- A subprogram body is Ghost when it is stand alone and subject |
3200 | -- to pragma Ghost or when the corresponding spec is Ghost. Set | |
3201 | -- the mode now to ensure that any nodes generated during analysis | |
3202 | -- and expansion are properly marked as Ghost. | |
8636f52f HK |
3203 | |
3204 | Set_Ghost_Mode (N, Spec_Id); | |
996ae0b0 RK |
3205 | end if; |
3206 | end if; | |
3207 | ||
799d0e05 AC |
3208 | -- Previously we scanned the body to look for nested subprograms, and |
3209 | -- rejected an inline directive if nested subprograms were present, | |
3210 | -- because the back-end would generate conflicting symbols for the | |
c8957aae | 3211 | -- nested bodies. This is now unnecessary. |
07fc65c4 | 3212 | |
c8957aae | 3213 | -- Look ahead to recognize a pragma Inline that appears after the body |
84f4072a | 3214 | |
e660dbf7 JM |
3215 | Check_Inline_Pragma (Spec_Id); |
3216 | ||
701b7fbb RD |
3217 | -- Deal with special case of a fully private operation in the body of |
3218 | -- the protected type. We must create a declaration for the subprogram, | |
3219 | -- in order to attach the protected subprogram that will be used in | |
3220 | -- internal calls. We exclude compiler generated bodies from the | |
3221 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 3222 | |
996ae0b0 RK |
3223 | if No (Spec_Id) |
3224 | and then Comes_From_Source (N) | |
3225 | and then Is_Protected_Type (Current_Scope) | |
3226 | then | |
47bfea3a | 3227 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 3228 | end if; |
996ae0b0 | 3229 | |
5334d18f | 3230 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 3231 | |
701b7fbb | 3232 | if Present (Spec_Id) then |
996ae0b0 | 3233 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 3234 | Verify_Overriding_Indicator; |
5d37ba92 ES |
3235 | |
3236 | -- In general, the spec will be frozen when we start analyzing the | |
3237 | -- body. However, for internally generated operations, such as | |
3238 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
3239 | -- results, the spec may not have been frozen by the time we expand |
3240 | -- the freeze actions that include the bodies. In particular, extra | |
3241 | -- formals for accessibility or for return-in-place may need to be | |
3242 | -- generated. Freeze nodes, if any, are inserted before the current | |
36f2e3d3 AC |
3243 | -- body. These freeze actions are also needed in ASIS mode and in |
3244 | -- Compile_Only mode to enable the proper back-end type annotations. | |
3245 | -- They are necessary in any case to insure order of elaboration | |
3246 | -- in gigi. | |
5d37ba92 ES |
3247 | |
3248 | if not Is_Frozen (Spec_Id) | |
36f2e3d3 AC |
3249 | and then (Expander_Active |
3250 | or else ASIS_Mode | |
3251 | or else (Operating_Mode = Check_Semantics | |
3252 | and then Serious_Errors_Detected = 0)) | |
5d37ba92 | 3253 | then |
5d37ba92 | 3254 | Set_Has_Delayed_Freeze (Spec_Id); |
6b958cec | 3255 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 3256 | end if; |
996ae0b0 RK |
3257 | end if; |
3258 | ||
3259 | -- Place subprogram on scope stack, and make formals visible. If there | |
3260 | -- is a spec, the visible entity remains that of the spec. | |
3261 | ||
3262 | if Present (Spec_Id) then | |
07fc65c4 | 3263 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
3264 | |
3265 | if Is_Child_Unit (Spec_Id) then | |
3266 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
3267 | end if; | |
3268 | ||
fbf5a39b AC |
3269 | if Style_Check then |
3270 | Style.Check_Identifier (Body_Id, Spec_Id); | |
3271 | end if; | |
996ae0b0 RK |
3272 | |
3273 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
3274 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3275 | ||
f937473f | 3276 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 3277 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
1af4455a | 3278 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 | 3279 | return; |
21d27997 | 3280 | |
996ae0b0 RK |
3281 | else |
3282 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
3283 | Set_Has_Completion (Spec_Id); | |
3284 | ||
c5cec2fe AC |
3285 | -- Inherit the "ghostness" of the subprogram spec. Note that this |
3286 | -- property is not directly inherited as the body may be subject | |
3287 | -- to a different Ghost assertion policy. | |
3288 | ||
8636f52f | 3289 | if Is_Ghost_Entity (Spec_Id) or else Ghost_Mode > None then |
c5cec2fe AC |
3290 | Set_Is_Ghost_Entity (Body_Id); |
3291 | ||
3292 | -- The Ghost policy in effect at the point of declaration and | |
c2cfccb1 | 3293 | -- at the point of completion must match (SPARK RM 6.9(14)). |
c5cec2fe AC |
3294 | |
3295 | Check_Ghost_Completion (Spec_Id, Body_Id); | |
3296 | end if; | |
3297 | ||
996ae0b0 | 3298 | if Is_Protected_Type (Scope (Spec_Id)) then |
21d27997 | 3299 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
3300 | end if; |
3301 | ||
3302 | -- If this is a body generated for a renaming, do not check for | |
3303 | -- full conformance. The check is redundant, because the spec of | |
3304 | -- the body is a copy of the spec in the renaming declaration, | |
3305 | -- and the test can lead to spurious errors on nested defaults. | |
3306 | ||
3307 | if Present (Spec_Decl) | |
996ae0b0 | 3308 | and then not Comes_From_Source (N) |
93a81b02 GB |
3309 | and then |
3310 | (Nkind (Original_Node (Spec_Decl)) = | |
4b6f99f5 | 3311 | N_Subprogram_Renaming_Declaration |
466c2127 AC |
3312 | or else (Present (Corresponding_Body (Spec_Decl)) |
3313 | and then | |
3314 | Nkind (Unit_Declaration_Node | |
3315 | (Corresponding_Body (Spec_Decl))) = | |
3316 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
3317 | then |
3318 | Conformant := True; | |
cabe9abc AC |
3319 | |
3320 | -- Conversely, the spec may have been generated for specless body | |
3321 | -- with an inline pragma. | |
3322 | ||
3323 | elsif Comes_From_Source (N) | |
3324 | and then not Comes_From_Source (Spec_Id) | |
3325 | and then Has_Pragma_Inline (Spec_Id) | |
3326 | then | |
3327 | Conformant := True; | |
76a69663 | 3328 | |
996ae0b0 RK |
3329 | else |
3330 | Check_Conformance | |
3331 | (Body_Id, Spec_Id, | |
76a69663 | 3332 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
3333 | end if; |
3334 | ||
3335 | -- If the body is not fully conformant, we have to decide if we | |
3336 | -- should analyze it or not. If it has a really messed up profile | |
3337 | -- then we probably should not analyze it, since we will get too | |
3338 | -- many bogus messages. | |
3339 | ||
3340 | -- Our decision is to go ahead in the non-fully conformant case | |
3341 | -- only if it is at least mode conformant with the spec. Note | |
3342 | -- that the call to Check_Fully_Conformant has issued the proper | |
3343 | -- error messages to complain about the lack of conformance. | |
3344 | ||
3345 | if not Conformant | |
3346 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
3347 | then | |
1af4455a | 3348 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 RK |
3349 | return; |
3350 | end if; | |
3351 | end if; | |
3352 | ||
996ae0b0 | 3353 | if Spec_Id /= Body_Id then |
fbf5a39b | 3354 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
3355 | end if; |
3356 | ||
579847c2 AC |
3357 | Set_Ekind (Body_Id, E_Subprogram_Body); |
3358 | ||
e28072cd AC |
3359 | if Nkind (N) = N_Subprogram_Body_Stub then |
3360 | Set_Corresponding_Spec_Of_Stub (N, Spec_Id); | |
3361 | ||
3362 | -- Regular body | |
3363 | ||
3364 | else | |
996ae0b0 | 3365 | Set_Corresponding_Spec (N, Spec_Id); |
758c442c | 3366 | |
5d37ba92 ES |
3367 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
3368 | -- of a concurrent type, the type of the first parameter has been | |
3369 | -- replaced with the corresponding record, which is the proper | |
3370 | -- run-time structure to use. However, within the body there may | |
3371 | -- be uses of the formals that depend on primitive operations | |
3372 | -- of the type (in particular calls in prefixed form) for which | |
3373 | -- we need the original concurrent type. The operation may have | |
3374 | -- several controlling formals, so the replacement must be done | |
3375 | -- for all of them. | |
758c442c GD |
3376 | |
3377 | if Comes_From_Source (Spec_Id) | |
3378 | and then Present (First_Entity (Spec_Id)) | |
3379 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
3380 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
15918371 AC |
3381 | and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
3382 | and then Present (Corresponding_Concurrent_Type | |
3383 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 3384 | then |
5d37ba92 ES |
3385 | declare |
3386 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
3387 | Form : Entity_Id; | |
3388 | ||
3389 | begin | |
3390 | Form := First_Formal (Spec_Id); | |
3391 | while Present (Form) loop | |
3392 | if Etype (Form) = Typ then | |
3393 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
3394 | end if; | |
3395 | ||
3396 | Next_Formal (Form); | |
3397 | end loop; | |
3398 | end; | |
758c442c GD |
3399 | end if; |
3400 | ||
21d27997 RD |
3401 | -- Make the formals visible, and place subprogram on scope stack. |
3402 | -- This is also the point at which we set Last_Real_Spec_Entity | |
3403 | -- to mark the entities which will not be moved to the body. | |
758c442c | 3404 | |
996ae0b0 | 3405 | Install_Formals (Spec_Id); |
21d27997 | 3406 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
616547fa AC |
3407 | |
3408 | -- Within an instance, add local renaming declarations so that | |
a5a809b2 AC |
3409 | -- gdb can retrieve the values of actuals more easily. This is |
3410 | -- only relevant if generating code (and indeed we definitely | |
3411 | -- do not want these definitions -gnatc mode, because that would | |
3412 | -- confuse ASIS). | |
616547fa AC |
3413 | |
3414 | if Is_Generic_Instance (Spec_Id) | |
3415 | and then Is_Wrapper_Package (Current_Scope) | |
a5a809b2 | 3416 | and then Expander_Active |
616547fa AC |
3417 | then |
3418 | Build_Subprogram_Instance_Renamings (N, Current_Scope); | |
3419 | end if; | |
3420 | ||
0a36105d | 3421 | Push_Scope (Spec_Id); |
996ae0b0 RK |
3422 | |
3423 | -- Make sure that the subprogram is immediately visible. For | |
3424 | -- child units that have no separate spec this is indispensable. | |
3425 | -- Otherwise it is safe albeit redundant. | |
3426 | ||
3427 | Set_Is_Immediately_Visible (Spec_Id); | |
3428 | end if; | |
3429 | ||
3430 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
ec4867fa | 3431 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
c9d70ab1 | 3432 | Set_Scope (Body_Id, Scope (Spec_Id)); |
996ae0b0 RK |
3433 | |
3434 | -- Case of subprogram body with no previous spec | |
3435 | ||
3436 | else | |
3e5daac4 AC |
3437 | -- Check for style warning required |
3438 | ||
996ae0b0 | 3439 | if Style_Check |
3e5daac4 AC |
3440 | |
3441 | -- Only apply check for source level subprograms for which checks | |
3442 | -- have not been suppressed. | |
3443 | ||
996ae0b0 RK |
3444 | and then Comes_From_Source (Body_Id) |
3445 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
3446 | |
3447 | -- No warnings within an instance | |
3448 | ||
996ae0b0 | 3449 | and then not In_Instance |
3e5daac4 | 3450 | |
b0186f71 | 3451 | -- No warnings for expression functions |
3e5daac4 | 3452 | |
b0186f71 | 3453 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
3454 | then |
3455 | Style.Body_With_No_Spec (N); | |
3456 | end if; | |
3457 | ||
3458 | New_Overloaded_Entity (Body_Id); | |
3459 | ||
3460 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
3461 | Set_Acts_As_Spec (N); | |
3462 | Generate_Definition (Body_Id); | |
fbf5a39b AC |
3463 | Generate_Reference |
3464 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 3465 | Install_Formals (Body_Id); |
e949ee22 | 3466 | |
4a854847 | 3467 | Push_Scope (Body_Id); |
996ae0b0 | 3468 | end if; |
dbe36d67 AC |
3469 | |
3470 | -- For stubs and bodies with no previous spec, generate references to | |
3471 | -- formals. | |
3472 | ||
3473 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
3474 | end if; |
3475 | ||
5216b599 AC |
3476 | -- Set SPARK_Mode from context |
3477 | ||
3478 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); | |
f145ece7 | 3479 | Set_SPARK_Pragma_Inherited (Body_Id); |
5216b599 | 3480 | |
76a69663 ES |
3481 | -- If the return type is an anonymous access type whose designated type |
3482 | -- is the limited view of a class-wide type and the non-limited view is | |
3483 | -- available, update the return type accordingly. | |
ec4867fa | 3484 | |
8fde064e | 3485 | if Ada_Version >= Ada_2005 and then Comes_From_Source (N) then |
ec4867fa | 3486 | declare |
ec4867fa | 3487 | Etyp : Entity_Id; |
0a36105d | 3488 | Rtyp : Entity_Id; |
ec4867fa ES |
3489 | |
3490 | begin | |
0a36105d JM |
3491 | Rtyp := Etype (Current_Scope); |
3492 | ||
3493 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
3494 | Etyp := Directly_Designated_Type (Rtyp); | |
3495 | ||
7b56a91b AC |
3496 | if Is_Class_Wide_Type (Etyp) |
3497 | and then From_Limited_With (Etyp) | |
3498 | then | |
0a36105d JM |
3499 | Set_Directly_Designated_Type |
3500 | (Etype (Current_Scope), Available_View (Etyp)); | |
3501 | end if; | |
3502 | end if; | |
ec4867fa ES |
3503 | end; |
3504 | end if; | |
3505 | ||
996ae0b0 RK |
3506 | -- If this is the proper body of a stub, we must verify that the stub |
3507 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 3508 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
3509 | -- only required for subprograms that come from source. |
3510 | ||
3511 | if Nkind (Parent (N)) = N_Subunit | |
3512 | and then Comes_From_Source (N) | |
3513 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
3514 | and then Nkind (Corresponding_Stub (Parent (N))) = |
3515 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
3516 | then |
3517 | declare | |
fbf5a39b AC |
3518 | Old_Id : constant Entity_Id := |
3519 | Defining_Entity | |
3520 | (Specification (Corresponding_Stub (Parent (N)))); | |
3521 | ||
996ae0b0 | 3522 | Conformant : Boolean := False; |
996ae0b0 RK |
3523 | |
3524 | begin | |
3525 | if No (Spec_Id) then | |
3526 | Check_Fully_Conformant (Body_Id, Old_Id); | |
3527 | ||
3528 | else | |
3529 | Check_Conformance | |
3530 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
3531 | ||
3532 | if not Conformant then | |
3533 | ||
dbe36d67 AC |
3534 | -- The stub was taken to be a new declaration. Indicate that |
3535 | -- it lacks a body. | |
996ae0b0 RK |
3536 | |
3537 | Set_Has_Completion (Old_Id, False); | |
3538 | end if; | |
3539 | end if; | |
3540 | end; | |
3541 | end if; | |
3542 | ||
3543 | Set_Has_Completion (Body_Id); | |
3544 | Check_Eliminated (Body_Id); | |
3545 | ||
caf07df9 AC |
3546 | -- Analyze any aspect specifications that appear on the subprogram body |
3547 | -- stub. Stop the analysis now as the stub does not have a declarative | |
3548 | -- or a statement part, and it cannot be inlined. | |
c8a3028c | 3549 | |
caf07df9 | 3550 | if Nkind (N) = N_Subprogram_Body_Stub then |
c8a3028c | 3551 | if Has_Aspects (N) then |
caf07df9 | 3552 | Analyze_Aspect_Specifications_On_Body_Or_Stub (N); |
c8a3028c AC |
3553 | end if; |
3554 | ||
1af4455a | 3555 | Ghost_Mode := Save_Ghost_Mode; |
996ae0b0 | 3556 | return; |
84f4072a | 3557 | end if; |
996ae0b0 | 3558 | |
b94b6c56 | 3559 | -- Handle frontend inlining |
84f4072a | 3560 | |
b94b6c56 RD |
3561 | -- Note: Normally we don't do any inlining if expansion is off, since |
3562 | -- we won't generate code in any case. An exception arises in GNATprove | |
2d180af1 YM |
3563 | -- mode where we want to expand some calls in place, even with expansion |
3564 | -- disabled, since the inlining eases formal verification. | |
ecad37f3 | 3565 | |
6c26bac2 AC |
3566 | if not GNATprove_Mode |
3567 | and then Expander_Active | |
3568 | and then Serious_Errors_Detected = 0 | |
3569 | and then Present (Spec_Id) | |
3570 | and then Has_Pragma_Inline (Spec_Id) | |
3571 | then | |
3572 | -- Legacy implementation (relying on frontend inlining) | |
84f4072a | 3573 | |
6c26bac2 | 3574 | if not Back_End_Inlining then |
17ce1f52 AC |
3575 | if (Has_Pragma_Inline_Always (Spec_Id) |
3576 | and then not Opt.Disable_FE_Inline_Always) | |
3577 | or else | |
3578 | (Has_Pragma_Inline (Spec_Id) and then Front_End_Inlining | |
3579 | and then not Opt.Disable_FE_Inline) | |
6c26bac2 AC |
3580 | then |
3581 | Build_Body_To_Inline (N, Spec_Id); | |
3582 | end if; | |
f087ea44 | 3583 | |
88f7d2d1 | 3584 | -- New implementation (relying on backend inlining) |
f087ea44 | 3585 | |
6c26bac2 AC |
3586 | else |
3587 | if Has_Pragma_Inline_Always (Spec_Id) | |
3588 | or else Optimization_Level > 0 | |
3589 | then | |
3590 | -- Handle function returning an unconstrained type | |
f087ea44 | 3591 | |
6c26bac2 AC |
3592 | if Comes_From_Source (Body_Id) |
3593 | and then Ekind (Spec_Id) = E_Function | |
3594 | and then Returns_Unconstrained_Type (Spec_Id) | |
5c5e108f AC |
3595 | |
3596 | -- If function builds in place, i.e. returns a limited type, | |
3597 | -- inlining cannot be done. | |
3598 | ||
3599 | and then not Is_Limited_Type (Etype (Spec_Id)) | |
6c26bac2 | 3600 | then |
16b10ccc | 3601 | Check_And_Split_Unconstrained_Function (N, Spec_Id, Body_Id); |
84f4072a | 3602 | |
6c26bac2 AC |
3603 | else |
3604 | declare | |
b80a2b4b AC |
3605 | Subp_Body : constant Node_Id := |
3606 | Unit_Declaration_Node (Body_Id); | |
6c26bac2 | 3607 | Subp_Decl : constant List_Id := Declarations (Subp_Body); |
84f4072a | 3608 | |
6c26bac2 AC |
3609 | begin |
3610 | -- Do not pass inlining to the backend if the subprogram | |
3611 | -- has declarations or statements which cannot be inlined | |
3612 | -- by the backend. This check is done here to emit an | |
3613 | -- error instead of the generic warning message reported | |
3614 | -- by the GCC backend (ie. "function might not be | |
3615 | -- inlinable"). | |
3616 | ||
3617 | if Present (Subp_Decl) | |
3618 | and then Has_Excluded_Declaration (Spec_Id, Subp_Decl) | |
3619 | then | |
3620 | null; | |
3621 | ||
3622 | elsif Has_Excluded_Statement | |
3623 | (Spec_Id, | |
3624 | Statements | |
3625 | (Handled_Statement_Sequence (Subp_Body))) | |
3626 | then | |
3627 | null; | |
3628 | ||
3629 | -- If the backend inlining is available then at this | |
3630 | -- stage we only have to mark the subprogram as inlined. | |
3631 | -- The expander will take care of registering it in the | |
3632 | -- table of subprograms inlined by the backend a part of | |
3633 | -- processing calls to it (cf. Expand_Call) | |
3634 | ||
3635 | else | |
3636 | Set_Is_Inlined (Spec_Id); | |
3637 | end if; | |
3638 | end; | |
3639 | end if; | |
3640 | end if; | |
3641 | end if; | |
2d180af1 YM |
3642 | |
3643 | -- In GNATprove mode, inline only when there is a separate subprogram | |
3644 | -- declaration for now, as inlining of subprogram bodies acting as | |
3645 | -- declarations, or subprogram stubs, are not supported by frontend | |
3646 | -- inlining. This inlining should occur after analysis of the body, so | |
d29f68cf AC |
3647 | -- that it is known whether the value of SPARK_Mode, which can be |
3648 | -- defined by a pragma inside the body, is applicable to the body. | |
2d180af1 YM |
3649 | |
3650 | elsif GNATprove_Mode | |
2d180af1 YM |
3651 | and then Full_Analysis |
3652 | and then not Inside_A_Generic | |
3653 | and then Present (Spec_Id) | |
7c4d86c9 AC |
3654 | and then |
3655 | Nkind (Unit_Declaration_Node (Spec_Id)) = N_Subprogram_Declaration | |
2d180af1 | 3656 | and then Can_Be_Inlined_In_GNATprove_Mode (Spec_Id, Body_Id) |
ac072cb2 | 3657 | and then not Body_Has_Contract |
2d180af1 | 3658 | then |
6c26bac2 | 3659 | Build_Body_To_Inline (N, Spec_Id); |
996ae0b0 RK |
3660 | end if; |
3661 | ||
0ab80019 | 3662 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 3663 | -- of the specification we have to install the private withed units. |
21d27997 | 3664 | -- This holds for child units as well. |
9bc856dd AC |
3665 | |
3666 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 3667 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
3668 | then |
3669 | Install_Private_With_Clauses (Body_Id); | |
3670 | end if; | |
3671 | ||
ec4867fa ES |
3672 | Check_Anonymous_Return; |
3673 | ||
fdce4bb7 JM |
3674 | -- Set the Protected_Formal field of each extra formal of the protected |
3675 | -- subprogram to reference the corresponding extra formal of the | |
3676 | -- subprogram that implements it. For regular formals this occurs when | |
3677 | -- the protected subprogram's declaration is expanded, but the extra | |
3678 | -- formals don't get created until the subprogram is frozen. We need to | |
3679 | -- do this before analyzing the protected subprogram's body so that any | |
3680 | -- references to the original subprogram's extra formals will be changed | |
3681 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
3682 | ||
3683 | if Present (Spec_Id) | |
3684 | and then Is_Protected_Type (Scope (Spec_Id)) | |
3685 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
3686 | then | |
3687 | declare | |
3688 | Impl_Subp : constant Entity_Id := | |
3689 | Protected_Body_Subprogram (Spec_Id); | |
3690 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
3691 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
3692 | begin |
3693 | while Present (Prot_Ext_Formal) loop | |
3694 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 3695 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
3696 | Next_Formal_With_Extras (Prot_Ext_Formal); |
3697 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
3698 | end loop; | |
3699 | end; | |
3700 | end if; | |
3701 | ||
0868e09c | 3702 | -- Now we can go on to analyze the body |
996ae0b0 RK |
3703 | |
3704 | HSS := Handled_Statement_Sequence (N); | |
3705 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 3706 | |
f3d0f304 | 3707 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
3708 | -- for discriminals and privals and finally a declaration for the entry |
3709 | -- family index (if applicable). This form of early expansion is done | |
3710 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 | 3711 | -- references entities which were created during regular expansion. The |
3b8056a5 AC |
3712 | -- subprogram entity must come from source, and not be an internally |
3713 | -- generated subprogram. | |
21d27997 | 3714 | |
4460a9bc | 3715 | if Expander_Active |
21d27997 RD |
3716 | and then Present (Prot_Typ) |
3717 | and then Present (Spec_Id) | |
3b8056a5 | 3718 | and then Comes_From_Source (Spec_Id) |
21d27997 RD |
3719 | and then not Is_Eliminated (Spec_Id) |
3720 | then | |
3721 | Install_Private_Data_Declarations | |
3722 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
3723 | end if; | |
3724 | ||
5dcab3ca AC |
3725 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
3726 | -- may now appear in parameter and result profiles. Since the analysis | |
3727 | -- of a subprogram body may use the parameter and result profile of the | |
3728 | -- spec, swap any limited views with their non-limited counterpart. | |
3729 | ||
3730 | if Ada_Version >= Ada_2012 then | |
3731 | Exchange_Limited_Views (Spec_Id); | |
3732 | end if; | |
3733 | ||
c8a3028c AC |
3734 | -- Analyze any aspect specifications that appear on the subprogram body |
3735 | ||
3736 | if Has_Aspects (N) then | |
caf07df9 | 3737 | Analyze_Aspect_Specifications_On_Body_Or_Stub (N); |
c8a3028c AC |
3738 | end if; |
3739 | ||
996ae0b0 | 3740 | Analyze_Declarations (Declarations (N)); |
21d27997 | 3741 | |
f3124d8f | 3742 | -- Verify that the SPARK_Mode of the body agrees with that of its spec |
f90d14ac | 3743 | |
f1c7be38 | 3744 | if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then |
f90d14ac AC |
3745 | if Present (SPARK_Pragma (Spec_Id)) then |
3746 | if Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Spec_Id)) = Off | |
3747 | and then | |
3748 | Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Body_Id)) = On | |
3749 | then | |
3750 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3751 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3752 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); | |
3753 | Error_Msg_NE | |
f3124d8f | 3754 | ("\value Off was set for SPARK_Mode on & #", N, Spec_Id); |
f90d14ac AC |
3755 | end if; |
3756 | ||
3757 | elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then | |
3758 | null; | |
3759 | ||
3760 | else | |
3761 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3ccedacc | 3762 | Error_Msg_N ("incorrect application of SPARK_Mode #", N); |
f90d14ac | 3763 | Error_Msg_Sloc := Sloc (Spec_Id); |
f3124d8f HK |
3764 | Error_Msg_NE |
3765 | ("\no value was set for SPARK_Mode on & #", N, Spec_Id); | |
f90d14ac AC |
3766 | end if; |
3767 | end if; | |
3768 | ||
c9d70ab1 AC |
3769 | -- When a subprogram body appears inside a package, its contract is |
3770 | -- analyzed at the end of the package body declarations. This is due | |
3771 | -- to the delay with respect of the package contract upon which the | |
3772 | -- body contract may depend. When the subprogram body is stand alone | |
3773 | -- and acts as a compilation unit, this delay is not necessary. | |
3774 | ||
3775 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
3776 | Analyze_Subprogram_Body_Contract (Body_Id); | |
3777 | end if; | |
3778 | ||
3779 | -- Deal with preconditions, [refined] postconditions, Contract_Cases, | |
3780 | -- invariants and predicates associated with body and its spec. Since | |
3781 | -- there is no routine Expand_Declarations which would otherwise deal | |
3782 | -- with the contract expansion, generate all necessary mechanisms to | |
3783 | -- verify the contract assertions now. | |
3784 | ||
3785 | Expand_Subprogram_Contract (N); | |
3786 | ||
ac43e11e AC |
3787 | -- If SPARK_Mode for body is not On, disable frontend inlining for this |
3788 | -- subprogram in GNATprove mode, as its body should not be analyzed. | |
3789 | ||
3790 | if SPARK_Mode /= On | |
3791 | and then GNATprove_Mode | |
ac43e11e AC |
3792 | and then Present (Spec_Id) |
3793 | and then Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Declaration | |
3794 | then | |
3795 | Set_Body_To_Inline (Parent (Parent (Spec_Id)), Empty); | |
4bd4bb7f | 3796 | Set_Is_Inlined_Always (Spec_Id, False); |
ac43e11e AC |
3797 | end if; |
3798 | ||
21d27997 RD |
3799 | -- Check completion, and analyze the statements |
3800 | ||
996ae0b0 | 3801 | Check_Completion; |
33931112 | 3802 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 3803 | Analyze (HSS); |
21d27997 RD |
3804 | |
3805 | -- Deal with end of scope processing for the body | |
3806 | ||
07fc65c4 | 3807 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
3808 | End_Scope; |
3809 | Check_Subprogram_Order (N); | |
c37bb106 | 3810 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
3811 | |
3812 | -- If we have a separate spec, then the analysis of the declarations | |
3813 | -- caused the entities in the body to be chained to the spec id, but | |
3814 | -- we want them chained to the body id. Only the formal parameters | |
3815 | -- end up chained to the spec id in this case. | |
3816 | ||
3817 | if Present (Spec_Id) then | |
3818 | ||
d39d6bb8 | 3819 | -- We must conform to the categorization of our spec |
996ae0b0 | 3820 | |
d39d6bb8 | 3821 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 3822 | |
d39d6bb8 RD |
3823 | -- And if this is a child unit, the parent units must conform |
3824 | ||
3825 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
3826 | Validate_Categorization_Dependency |
3827 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
3828 | end if; | |
3829 | ||
21d27997 RD |
3830 | -- Here is where we move entities from the spec to the body |
3831 | ||
3832 | -- Case where there are entities that stay with the spec | |
3833 | ||
3834 | if Present (Last_Real_Spec_Entity) then | |
3835 | ||
dbe36d67 AC |
3836 | -- No body entities (happens when the only real spec entities come |
3837 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
3838 | |
3839 | if No (Last_Entity (Body_Id)) then | |
7c4d86c9 | 3840 | Set_First_Entity (Body_Id, Next_Entity (Last_Real_Spec_Entity)); |
21d27997 RD |
3841 | |
3842 | -- Body entities present (formals), so chain stuff past them | |
3843 | ||
3844 | else | |
3845 | Set_Next_Entity | |
3846 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
3847 | end if; | |
3848 | ||
3849 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 3850 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
3851 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
3852 | ||
dbe36d67 AC |
3853 | -- Case where there are no spec entities, in this case there can be |
3854 | -- no body entities either, so just move everything. | |
996ae0b0 | 3855 | |
a921e83c AC |
3856 | -- If the body is generated for an expression function, it may have |
3857 | -- been preanalyzed already, if 'access was applied to it. | |
3858 | ||
996ae0b0 | 3859 | else |
a921e83c AC |
3860 | if Nkind (Original_Node (Unit_Declaration_Node (Spec_Id))) /= |
3861 | N_Expression_Function | |
3862 | then | |
3863 | pragma Assert (No (Last_Entity (Body_Id))); | |
3864 | null; | |
3865 | end if; | |
3866 | ||
996ae0b0 RK |
3867 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
3868 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
3869 | Set_First_Entity (Spec_Id, Empty); | |
3870 | Set_Last_Entity (Spec_Id, Empty); | |
3871 | end if; | |
3872 | end if; | |
3873 | ||
7665e4bd | 3874 | Check_Missing_Return; |
996ae0b0 | 3875 | |
82c80734 | 3876 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
3877 | -- the body of the procedure. But first we deal with a special case |
3878 | -- where we want to modify this check. If the body of the subprogram | |
3879 | -- starts with a raise statement or its equivalent, or if the body | |
cf3e6845 AC |
3880 | -- consists entirely of a null statement, then it is pretty obvious that |
3881 | -- it is OK to not reference the parameters. For example, this might be | |
3882 | -- the following common idiom for a stubbed function: statement of the | |
3883 | -- procedure raises an exception. In particular this deals with the | |
3884 | -- common idiom of a stubbed function, which appears something like: | |
fbf5a39b AC |
3885 | |
3886 | -- function F (A : Integer) return Some_Type; | |
3887 | -- X : Some_Type; | |
3888 | -- begin | |
3889 | -- raise Program_Error; | |
3890 | -- return X; | |
3891 | -- end F; | |
3892 | ||
76a69663 ES |
3893 | -- Here the purpose of X is simply to satisfy the annoying requirement |
3894 | -- in Ada that there be at least one return, and we certainly do not | |
a90bd866 | 3895 | -- want to go posting warnings on X that it is not initialized. On |
76a69663 ES |
3896 | -- the other hand, if X is entirely unreferenced that should still |
3897 | -- get a warning. | |
3898 | ||
3899 | -- What we do is to detect these cases, and if we find them, flag the | |
3900 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
3901 | -- suppress unwanted warnings. For the case of the function stub above | |
3902 | -- we have a special test to set X as apparently assigned to suppress | |
3903 | -- the warning. | |
996ae0b0 RK |
3904 | |
3905 | declare | |
800621e0 | 3906 | Stm : Node_Id; |
996ae0b0 RK |
3907 | |
3908 | begin | |
0a36105d JM |
3909 | -- Skip initial labels (for one thing this occurs when we are in |
3910 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
3911 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 3912 | |
800621e0 | 3913 | Stm := First (Statements (HSS)); |
0a36105d JM |
3914 | while Nkind (Stm) = N_Label |
3915 | or else Nkind (Stm) in N_Push_xxx_Label | |
3916 | loop | |
996ae0b0 | 3917 | Next (Stm); |
0a36105d | 3918 | end loop; |
996ae0b0 | 3919 | |
fbf5a39b AC |
3920 | -- Do the test on the original statement before expansion |
3921 | ||
3922 | declare | |
3923 | Ostm : constant Node_Id := Original_Node (Stm); | |
3924 | ||
3925 | begin | |
76a69663 | 3926 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
3927 | |
3928 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
3929 | Set_Trivial_Subprogram (Stm); |
3930 | ||
f3d57416 | 3931 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
3932 | |
3933 | elsif Nkind (Stm) = N_Null_Statement | |
3934 | and then Comes_From_Source (Stm) | |
3935 | and then No (Next (Stm)) | |
3936 | then | |
3937 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
3938 | |
3939 | -- Check for explicit call cases which likely raise an exception | |
3940 | ||
3941 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
3942 | if Is_Entity_Name (Name (Ostm)) then | |
3943 | declare | |
3944 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
3945 | ||
3946 | begin | |
3947 | -- If the procedure is marked No_Return, then likely it | |
3948 | -- raises an exception, but in any case it is not coming | |
76a69663 | 3949 | -- back here, so turn on the flag. |
fbf5a39b | 3950 | |
f46faa08 AC |
3951 | if Present (Ent) |
3952 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
3953 | and then No_Return (Ent) |
3954 | then | |
76a69663 | 3955 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
3956 | end if; |
3957 | end; | |
3958 | end if; | |
3959 | end if; | |
3960 | end; | |
996ae0b0 RK |
3961 | end; |
3962 | ||
3963 | -- Check for variables that are never modified | |
3964 | ||
3965 | declare | |
3966 | E1, E2 : Entity_Id; | |
3967 | ||
3968 | begin | |
fbf5a39b | 3969 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
3970 | -- flags from out parameters to the corresponding entities in the |
3971 | -- body. The reason we do that is we want to post error flags on | |
3972 | -- the body entities, not the spec entities. | |
3973 | ||
3974 | if Present (Spec_Id) then | |
3975 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
3976 | while Present (E1) loop |
3977 | if Ekind (E1) = E_Out_Parameter then | |
3978 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 3979 | while Present (E2) loop |
996ae0b0 RK |
3980 | exit when Chars (E1) = Chars (E2); |
3981 | Next_Entity (E2); | |
3982 | end loop; | |
3983 | ||
fbf5a39b AC |
3984 | if Present (E2) then |
3985 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
3986 | end if; | |
996ae0b0 RK |
3987 | end if; |
3988 | ||
3989 | Next_Entity (E1); | |
3990 | end loop; | |
3991 | end if; | |
3992 | ||
2aca76d6 | 3993 | -- Check references in body |
0868e09c | 3994 | |
2aca76d6 | 3995 | Check_References (Body_Id); |
996ae0b0 | 3996 | end; |
5a271a7f RD |
3997 | |
3998 | -- Check for nested subprogram, and mark outer level subprogram if so | |
3999 | ||
4000 | declare | |
4001 | Ent : Entity_Id; | |
4002 | ||
4003 | begin | |
4004 | if Present (Spec_Id) then | |
4005 | Ent := Spec_Id; | |
4006 | else | |
4007 | Ent := Body_Id; | |
4008 | end if; | |
4009 | ||
4010 | loop | |
4011 | Ent := Enclosing_Subprogram (Ent); | |
4012 | exit when No (Ent) or else Is_Subprogram (Ent); | |
4013 | end loop; | |
4014 | ||
4015 | if Present (Ent) then | |
4016 | Set_Has_Nested_Subprogram (Ent); | |
4017 | end if; | |
4018 | end; | |
241ebe89 | 4019 | |
1af4455a | 4020 | Ghost_Mode := Save_Ghost_Mode; |
b1b543d2 | 4021 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 | 4022 | |
5afe5d2d HK |
4023 | --------------------------------- |
4024 | -- Analyze_Subprogram_Contract -- | |
4025 | --------------------------------- | |
4026 | ||
c9d70ab1 | 4027 | procedure Analyze_Subprogram_Contract (Subp_Id : Entity_Id) is |
caf07df9 AC |
4028 | Items : constant Node_Id := Contract (Subp_Id); |
4029 | Depends : Node_Id := Empty; | |
4030 | Global : Node_Id := Empty; | |
4031 | Mode : SPARK_Mode_Type; | |
4032 | Prag : Node_Id; | |
4033 | Prag_Nam : Name_Id; | |
5afe5d2d HK |
4034 | |
4035 | begin | |
fc999c5d RD |
4036 | -- Due to the timing of contract analysis, delayed pragmas may be |
4037 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
4038 | -- context. To remedy this, restore the original SPARK_Mode of the | |
4039 | -- related subprogram body. | |
4040 | ||
c9d70ab1 AC |
4041 | Save_SPARK_Mode_And_Set (Subp_Id, Mode); |
4042 | ||
caf07df9 AC |
4043 | -- All subprograms carry a contract, but for some it is not significant |
4044 | -- and should not be processed. | |
c9d70ab1 | 4045 | |
caf07df9 AC |
4046 | if not Has_Significant_Contract (Subp_Id) then |
4047 | null; | |
c61ef416 | 4048 | |
caf07df9 | 4049 | elsif Present (Items) then |
5afe5d2d HK |
4050 | |
4051 | -- Analyze pre- and postconditions | |
4052 | ||
4053 | Prag := Pre_Post_Conditions (Items); | |
4054 | while Present (Prag) loop | |
c9d70ab1 | 4055 | Analyze_Pre_Post_Condition_In_Decl_Part (Prag); |
5afe5d2d HK |
4056 | Prag := Next_Pragma (Prag); |
4057 | end loop; | |
4058 | ||
4059 | -- Analyze contract-cases and test-cases | |
4060 | ||
4061 | Prag := Contract_Test_Cases (Items); | |
4062 | while Present (Prag) loop | |
c9d70ab1 | 4063 | Prag_Nam := Pragma_Name (Prag); |
ea3c0651 | 4064 | |
c9d70ab1 | 4065 | if Prag_Nam = Name_Contract_Cases then |
5afe5d2d | 4066 | Analyze_Contract_Cases_In_Decl_Part (Prag); |
5afe5d2d | 4067 | else |
c9d70ab1 AC |
4068 | pragma Assert (Prag_Nam = Name_Test_Case); |
4069 | Analyze_Test_Case_In_Decl_Part (Prag); | |
5afe5d2d HK |
4070 | end if; |
4071 | ||
4072 | Prag := Next_Pragma (Prag); | |
4073 | end loop; | |
4074 | ||
4075 | -- Analyze classification pragmas | |
4076 | ||
6c3c671e | 4077 | Prag := Classifications (Items); |
5afe5d2d | 4078 | while Present (Prag) loop |
c9d70ab1 | 4079 | Prag_Nam := Pragma_Name (Prag); |
ea3c0651 | 4080 | |
c9d70ab1 | 4081 | if Prag_Nam = Name_Depends then |
54e28df2 | 4082 | Depends := Prag; |
039538bc | 4083 | |
c9d70ab1 | 4084 | elsif Prag_Nam = Name_Global then |
54e28df2 | 4085 | Global := Prag; |
039538bc AC |
4086 | |
4087 | -- Note that pragma Extensions_Visible has already been analyzed | |
4088 | ||
5afe5d2d HK |
4089 | end if; |
4090 | ||
4091 | Prag := Next_Pragma (Prag); | |
4092 | end loop; | |
54e28df2 HK |
4093 | |
4094 | -- Analyze Global first as Depends may mention items classified in | |
4095 | -- the global categorization. | |
4096 | ||
4097 | if Present (Global) then | |
4098 | Analyze_Global_In_Decl_Part (Global); | |
4099 | end if; | |
4100 | ||
4101 | -- Depends must be analyzed after Global in order to see the modes of | |
4102 | -- all global items. | |
4103 | ||
4104 | if Present (Depends) then | |
4105 | Analyze_Depends_In_Decl_Part (Depends); | |
4106 | end if; | |
5afe5d2d | 4107 | |
c9d70ab1 AC |
4108 | -- Ensure that the contract cases or postconditions mention 'Result |
4109 | -- or define a post-state. | |
5afe5d2d | 4110 | |
c9d70ab1 AC |
4111 | Check_Result_And_Post_State (Subp_Id); |
4112 | end if; | |
5afe5d2d | 4113 | |
847d950d HK |
4114 | -- A non-volatile function cannot have an effectively volatile formal |
4115 | -- parameter or return type (SPARK RM 7.1.3(9)). This check is relevant | |
4116 | -- only when SPARK_Mode is on as it is not a standard legality rule. The | |
4117 | -- check is performed here because pragma Volatile_Function is processed | |
4118 | -- after the analysis of the related subprogram declaration. | |
4119 | ||
4120 | if SPARK_Mode = On | |
4121 | and then Ekind_In (Subp_Id, E_Function, E_Generic_Function) | |
4122 | and then not Is_Volatile_Function (Subp_Id) | |
4123 | then | |
4124 | Check_Nonvolatile_Function_Profile (Subp_Id); | |
4125 | end if; | |
4126 | ||
fc999c5d RD |
4127 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
4128 | -- pragmas have been analyzed. | |
4129 | ||
c61ef416 | 4130 | Restore_SPARK_Mode (Mode); |
5afe5d2d HK |
4131 | end Analyze_Subprogram_Contract; |
4132 | ||
996ae0b0 RK |
4133 | ------------------------------------ |
4134 | -- Analyze_Subprogram_Declaration -- | |
4135 | ------------------------------------ | |
4136 | ||
4137 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
579847c2 | 4138 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc | 4139 | Designator : Entity_Id; |
579847c2 | 4140 | |
4d8f3296 ES |
4141 | Is_Completion : Boolean; |
4142 | -- Indicates whether a null procedure declaration is a completion | |
996ae0b0 RK |
4143 | |
4144 | begin | |
2ba431e5 | 4145 | -- Null procedures are not allowed in SPARK |
daec8eeb | 4146 | |
fe5d3068 | 4147 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
4148 | and then Null_Present (Specification (N)) |
4149 | then | |
ce5ba43a | 4150 | Check_SPARK_05_Restriction ("null procedure is not allowed", N); |
718deaf1 | 4151 | |
73cc8f62 RD |
4152 | -- Null procedures are allowed in protected types, following the |
4153 | -- recent AI12-0147. | |
b741083a ES |
4154 | |
4155 | if Is_Protected_Type (Current_Scope) | |
4156 | and then Ada_Version < Ada_2012 | |
4157 | then | |
4d8f3296 ES |
4158 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
4159 | end if; | |
718deaf1 | 4160 | |
4d8f3296 | 4161 | Analyze_Null_Procedure (N, Is_Completion); |
718deaf1 | 4162 | |
241ebe89 | 4163 | -- The null procedure acts as a body, nothing further is needed |
5d5832bc | 4164 | |
241ebe89 | 4165 | if Is_Completion then |
4d8f3296 | 4166 | return; |
5d5832bc AC |
4167 | end if; |
4168 | end if; | |
4169 | ||
beacce02 | 4170 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
4171 | |
4172 | -- A reference may already have been generated for the unit name, in | |
4173 | -- which case the following call is redundant. However it is needed for | |
4174 | -- declarations that are the rewriting of an expression function. | |
4175 | ||
5d5832bc AC |
4176 | Generate_Definition (Designator); |
4177 | ||
f90d14ac AC |
4178 | -- Set SPARK mode from current context (may be overwritten later with |
4179 | -- explicit pragma). | |
4a854847 | 4180 | |
f90d14ac | 4181 | Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
8636f52f | 4182 | Set_SPARK_Pragma_Inherited (Designator); |
579847c2 | 4183 | |
8636f52f | 4184 | -- A subprogram declared within a Ghost region is automatically Ghost |
c5cec2fe AC |
4185 | -- (SPARK RM 6.9(2)). |
4186 | ||
8636f52f | 4187 | if Comes_From_Source (Designator) and then Ghost_Mode > None then |
c5cec2fe AC |
4188 | Set_Is_Ghost_Entity (Designator); |
4189 | end if; | |
4190 | ||
b1b543d2 BD |
4191 | if Debug_Flag_C then |
4192 | Write_Str ("==> subprogram spec "); | |
4193 | Write_Name (Chars (Designator)); | |
4194 | Write_Str (" from "); | |
4195 | Write_Location (Sloc (N)); | |
4196 | Write_Eol; | |
4197 | Indent; | |
4198 | end if; | |
4199 | ||
996ae0b0 | 4200 | Validate_RCI_Subprogram_Declaration (N); |
996ae0b0 RK |
4201 | New_Overloaded_Entity (Designator); |
4202 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 4203 | |
cf3e6845 AC |
4204 | -- If the type of the first formal of the current subprogram is a non- |
4205 | -- generic tagged private type, mark the subprogram as being a private | |
4206 | -- primitive. Ditto if this is a function with controlling result, and | |
4207 | -- the return type is currently private. In both cases, the type of the | |
4208 | -- controlling argument or result must be in the current scope for the | |
4209 | -- operation to be primitive. | |
6ca063eb AC |
4210 | |
4211 | if Has_Controlling_Result (Designator) | |
4212 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 4213 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
4214 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
4215 | then | |
4216 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 4217 | |
6ca063eb | 4218 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
4219 | declare |
4220 | Formal_Typ : constant Entity_Id := | |
4221 | Etype (First_Formal (Designator)); | |
4222 | begin | |
4223 | Set_Is_Private_Primitive (Designator, | |
4224 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 4225 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
4226 | and then Is_Private_Type (Formal_Typ) |
4227 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
4228 | end; | |
4229 | end if; | |
4230 | ||
ec4867fa ES |
4231 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
4232 | -- or null. | |
4233 | ||
0791fbe9 | 4234 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
4235 | and then Comes_From_Source (N) |
4236 | and then Is_Dispatching_Operation (Designator) | |
4237 | then | |
4238 | declare | |
4239 | E : Entity_Id; | |
4240 | Etyp : Entity_Id; | |
4241 | ||
4242 | begin | |
4243 | if Has_Controlling_Result (Designator) then | |
4244 | Etyp := Etype (Designator); | |
4245 | ||
4246 | else | |
4247 | E := First_Entity (Designator); | |
4248 | while Present (E) | |
4249 | and then Is_Formal (E) | |
4250 | and then not Is_Controlling_Formal (E) | |
4251 | loop | |
4252 | Next_Entity (E); | |
4253 | end loop; | |
4254 | ||
4255 | Etyp := Etype (E); | |
4256 | end if; | |
4257 | ||
4258 | if Is_Access_Type (Etyp) then | |
4259 | Etyp := Directly_Designated_Type (Etyp); | |
4260 | end if; | |
4261 | ||
4262 | if Is_Interface (Etyp) | |
f937473f | 4263 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa | 4264 | and then not (Ekind (Designator) = E_Procedure |
8fde064e | 4265 | and then Null_Present (Specification (N))) |
ec4867fa ES |
4266 | then |
4267 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
4268 | |
4269 | -- Specialize error message based on procedures vs. functions, | |
4270 | -- since functions can't be null subprograms. | |
4271 | ||
4272 | if Ekind (Designator) = E_Procedure then | |
4273 | Error_Msg_N | |
4274 | ("interface procedure % must be abstract or null", N); | |
4275 | else | |
3f80a182 AC |
4276 | Error_Msg_N |
4277 | ("interface function % must be abstract", N); | |
033eaf85 | 4278 | end if; |
ec4867fa ES |
4279 | end if; |
4280 | end; | |
4281 | end if; | |
4282 | ||
fbf5a39b AC |
4283 | -- What is the following code for, it used to be |
4284 | ||
4285 | -- ??? Set_Suppress_Elaboration_Checks | |
4286 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
4287 | ||
4288 | -- The following seems equivalent, but a bit dubious | |
4289 | ||
4290 | if Elaboration_Checks_Suppressed (Designator) then | |
4291 | Set_Kill_Elaboration_Checks (Designator); | |
4292 | end if; | |
996ae0b0 | 4293 | |
8fde064e | 4294 | if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then |
fbf5a39b | 4295 | Set_Categorization_From_Scope (Designator, Scop); |
8fde064e | 4296 | |
996ae0b0 | 4297 | else |
e895b435 | 4298 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 4299 | |
0a36105d | 4300 | Push_Scope (Designator); |
996ae0b0 RK |
4301 | Set_Categorization_From_Pragmas (N); |
4302 | Validate_Categorization_Dependency (N, Designator); | |
4303 | Pop_Scope; | |
4304 | end if; | |
4305 | ||
4306 | -- For a compilation unit, set body required. This flag will only be | |
4307 | -- reset if a valid Import or Interface pragma is processed later on. | |
4308 | ||
4309 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
4310 | Set_Body_Required (Parent (N), True); | |
758c442c | 4311 | |
0791fbe9 | 4312 | if Ada_Version >= Ada_2005 |
758c442c GD |
4313 | and then Nkind (Specification (N)) = N_Procedure_Specification |
4314 | and then Null_Present (Specification (N)) | |
4315 | then | |
4316 | Error_Msg_N | |
4317 | ("null procedure cannot be declared at library level", N); | |
4318 | end if; | |
996ae0b0 RK |
4319 | end if; |
4320 | ||
fbf5a39b | 4321 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 4322 | Check_Eliminated (Designator); |
fbf5a39b | 4323 | |
b1b543d2 BD |
4324 | if Debug_Flag_C then |
4325 | Outdent; | |
4326 | Write_Str ("<== subprogram spec "); | |
4327 | Write_Name (Chars (Designator)); | |
4328 | Write_Str (" from "); | |
4329 | Write_Location (Sloc (N)); | |
4330 | Write_Eol; | |
4331 | end if; | |
0f1a6a0b | 4332 | |
1a265e78 AC |
4333 | if Is_Protected_Type (Current_Scope) then |
4334 | ||
4335 | -- Indicate that this is a protected operation, because it may be | |
4336 | -- used in subsequent declarations within the protected type. | |
4337 | ||
4338 | Set_Convention (Designator, Convention_Protected); | |
4339 | end if; | |
4340 | ||
beacce02 | 4341 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
4342 | |
4343 | if Has_Aspects (N) then | |
4344 | Analyze_Aspect_Specifications (N, Designator); | |
4345 | end if; | |
996ae0b0 RK |
4346 | end Analyze_Subprogram_Declaration; |
4347 | ||
fbf5a39b AC |
4348 | -------------------------------------- |
4349 | -- Analyze_Subprogram_Specification -- | |
4350 | -------------------------------------- | |
4351 | ||
4352 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
4353 | -- declaration). This procedure is called to analyze the specification in | |
4354 | -- both subprogram bodies and subprogram declarations (specs). | |
4355 | ||
4356 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
4357 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 4358 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 4359 | |
758c442c GD |
4360 | -- Start of processing for Analyze_Subprogram_Specification |
4361 | ||
fbf5a39b | 4362 | begin |
2ba431e5 | 4363 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 4364 | |
db72f10a AC |
4365 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
4366 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
4367 | then | |
ce5ba43a AC |
4368 | Check_SPARK_05_Restriction |
4369 | ("user-defined operator is not allowed", N); | |
38171f43 AC |
4370 | end if; |
4371 | ||
31af8899 AC |
4372 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
4373 | -- specification comes from an expression function, because it may be | |
026c3cfd | 4374 | -- the completion of a previous declaration. It is not, the cross- |
31af8899 AC |
4375 | -- reference entry will be emitted for the new subprogram declaration. |
4376 | ||
4377 | if Nkind (Parent (N)) /= N_Expression_Function then | |
4378 | Generate_Definition (Designator); | |
4379 | end if; | |
38171f43 | 4380 | |
fbf5a39b AC |
4381 | if Nkind (N) = N_Function_Specification then |
4382 | Set_Ekind (Designator, E_Function); | |
4383 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
4384 | else |
4385 | Set_Ekind (Designator, E_Procedure); | |
4386 | Set_Etype (Designator, Standard_Void_Type); | |
4387 | end if; | |
4388 | ||
4bd4bb7f AC |
4389 | -- Flag Is_Inlined_Always is True by default, and reversed to False for |
4390 | -- those subprograms which could be inlined in GNATprove mode (because | |
319c6161 | 4391 | -- Body_To_Inline is non-Empty) but should not be inlined. |
4bd4bb7f AC |
4392 | |
4393 | if GNATprove_Mode then | |
4394 | Set_Is_Inlined_Always (Designator); | |
4395 | end if; | |
4396 | ||
800621e0 | 4397 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
4398 | |
4399 | Set_Scope (Designator, Current_Scope); | |
4400 | ||
fbf5a39b | 4401 | if Present (Formals) then |
0a36105d | 4402 | Push_Scope (Designator); |
fbf5a39b | 4403 | Process_Formals (Formals, N); |
758c442c | 4404 | |
0929eaeb AC |
4405 | -- Check dimensions in N for formals with default expression |
4406 | ||
4407 | Analyze_Dimension_Formals (N, Formals); | |
4408 | ||
a38ff9b1 ES |
4409 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
4410 | -- inherited interface operation, and the controlling type is | |
4411 | -- a synchronized type, replace the type with its corresponding | |
4412 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
4413 | -- Same processing for an access parameter whose designated type is |
4414 | -- derived from a synchronized interface. | |
758c442c | 4415 | |
0791fbe9 | 4416 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
4417 | declare |
4418 | Formal : Entity_Id; | |
4419 | Formal_Typ : Entity_Id; | |
4420 | Rec_Typ : Entity_Id; | |
69cb258c | 4421 | Desig_Typ : Entity_Id; |
0a36105d | 4422 | |
d44202ba HK |
4423 | begin |
4424 | Formal := First_Formal (Designator); | |
4425 | while Present (Formal) loop | |
4426 | Formal_Typ := Etype (Formal); | |
0a36105d | 4427 | |
d44202ba HK |
4428 | if Is_Concurrent_Type (Formal_Typ) |
4429 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4430 | then | |
4431 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
4432 | ||
4433 | if Present (Interfaces (Rec_Typ)) then | |
4434 | Set_Etype (Formal, Rec_Typ); | |
4435 | end if; | |
69cb258c AC |
4436 | |
4437 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
4438 | Desig_Typ := Designated_Type (Formal_Typ); | |
4439 | ||
4440 | if Is_Concurrent_Type (Desig_Typ) | |
4441 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
4442 | then | |
4443 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
4444 | ||
4445 | if Present (Interfaces (Rec_Typ)) then | |
4446 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
4447 | end if; | |
4448 | end if; | |
d44202ba HK |
4449 | end if; |
4450 | ||
4451 | Next_Formal (Formal); | |
4452 | end loop; | |
4453 | end; | |
758c442c GD |
4454 | end if; |
4455 | ||
fbf5a39b | 4456 | End_Scope; |
82c80734 | 4457 | |
b66c3ff4 AC |
4458 | -- The subprogram scope is pushed and popped around the processing of |
4459 | -- the return type for consistency with call above to Process_Formals | |
4460 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
4461 | -- itype created for the return type will be associated with the proper | |
4462 | -- scope. | |
4463 | ||
82c80734 | 4464 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 4465 | Push_Scope (Designator); |
82c80734 | 4466 | Analyze_Return_Type (N); |
b66c3ff4 | 4467 | End_Scope; |
fbf5a39b AC |
4468 | end if; |
4469 | ||
e606088a AC |
4470 | -- Function case |
4471 | ||
fbf5a39b | 4472 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
4473 | |
4474 | -- Deal with operator symbol case | |
4475 | ||
fbf5a39b AC |
4476 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
4477 | Valid_Operator_Definition (Designator); | |
4478 | end if; | |
4479 | ||
4480 | May_Need_Actuals (Designator); | |
4481 | ||
fe63b1b1 ES |
4482 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
4483 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
4484 | -- declarations, where abstractness is inherited, and to subprogram |
4485 | -- bodies generated for stream operations, which become renamings as | |
4486 | -- bodies. | |
2bfb1b72 | 4487 | |
fe63b1b1 ES |
4488 | -- In case of primitives associated with abstract interface types |
4489 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 4490 | |
1adaea16 | 4491 | if not Nkind_In (Original_Node (Parent (N)), |
3f80a182 | 4492 | N_Abstract_Subprogram_Declaration, |
847d950d HK |
4493 | N_Formal_Abstract_Subprogram_Declaration, |
4494 | N_Subprogram_Renaming_Declaration) | |
fbf5a39b | 4495 | then |
2e79de51 AC |
4496 | if Is_Abstract_Type (Etype (Designator)) |
4497 | and then not Is_Interface (Etype (Designator)) | |
4498 | then | |
4499 | Error_Msg_N | |
4500 | ("function that returns abstract type must be abstract", N); | |
4501 | ||
e606088a | 4502 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
4503 | -- access result whose designated type is abstract. |
4504 | ||
847d950d HK |
4505 | elsif Ada_Version >= Ada_2012 |
4506 | and then Nkind (Result_Definition (N)) = N_Access_Definition | |
2e79de51 AC |
4507 | and then |
4508 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
4509 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
2e79de51 | 4510 | then |
847d950d HK |
4511 | Error_Msg_N |
4512 | ("function whose access result designates abstract type " | |
4513 | & "must be abstract", N); | |
2e79de51 | 4514 | end if; |
fbf5a39b AC |
4515 | end if; |
4516 | end if; | |
4517 | ||
4518 | return Designator; | |
4519 | end Analyze_Subprogram_Specification; | |
4520 | ||
996ae0b0 RK |
4521 | ----------------------- |
4522 | -- Check_Conformance -- | |
4523 | ----------------------- | |
4524 | ||
4525 | procedure Check_Conformance | |
41251c60 JM |
4526 | (New_Id : Entity_Id; |
4527 | Old_Id : Entity_Id; | |
4528 | Ctype : Conformance_Type; | |
4529 | Errmsg : Boolean; | |
4530 | Conforms : out Boolean; | |
4531 | Err_Loc : Node_Id := Empty; | |
4532 | Get_Inst : Boolean := False; | |
4533 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 4534 | is |
996ae0b0 | 4535 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
4536 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
4537 | -- If Errmsg is True, then processing continues to post an error message | |
4538 | -- for conformance error on given node. Two messages are output. The | |
4539 | -- first message points to the previous declaration with a general "no | |
4540 | -- conformance" message. The second is the detailed reason, supplied as | |
4541 | -- Msg. The parameter N provide information for a possible & insertion | |
4542 | -- in the message, and also provides the location for posting the | |
4543 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
4544 | |
4545 | ----------------------- | |
4546 | -- Conformance_Error -- | |
4547 | ----------------------- | |
4548 | ||
4549 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
4550 | Enode : Node_Id; | |
4551 | ||
4552 | begin | |
4553 | Conforms := False; | |
4554 | ||
4555 | if Errmsg then | |
4556 | if No (Err_Loc) then | |
4557 | Enode := N; | |
4558 | else | |
4559 | Enode := Err_Loc; | |
4560 | end if; | |
4561 | ||
4562 | Error_Msg_Sloc := Sloc (Old_Id); | |
4563 | ||
4564 | case Ctype is | |
4565 | when Type_Conformant => | |
483c78cb | 4566 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
4567 | ("not type conformant with declaration#!", Enode); |
4568 | ||
4569 | when Mode_Conformant => | |
19590d70 | 4570 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4571 | Error_Msg_N |
19590d70 GD |
4572 | ("not mode conformant with operation inherited#!", |
4573 | Enode); | |
4574 | else | |
ed2233dc | 4575 | Error_Msg_N |
19590d70 GD |
4576 | ("not mode conformant with declaration#!", Enode); |
4577 | end if; | |
996ae0b0 RK |
4578 | |
4579 | when Subtype_Conformant => | |
19590d70 | 4580 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4581 | Error_Msg_N |
19590d70 GD |
4582 | ("not subtype conformant with operation inherited#!", |
4583 | Enode); | |
4584 | else | |
ed2233dc | 4585 | Error_Msg_N |
19590d70 GD |
4586 | ("not subtype conformant with declaration#!", Enode); |
4587 | end if; | |
996ae0b0 RK |
4588 | |
4589 | when Fully_Conformant => | |
19590d70 | 4590 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 4591 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4592 | ("not fully conformant with operation inherited#!", |
4593 | Enode); | |
4594 | else | |
483c78cb | 4595 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4596 | ("not fully conformant with declaration#!", Enode); |
4597 | end if; | |
996ae0b0 RK |
4598 | end case; |
4599 | ||
4600 | Error_Msg_NE (Msg, Enode, N); | |
4601 | end if; | |
4602 | end Conformance_Error; | |
4603 | ||
ec4867fa ES |
4604 | -- Local Variables |
4605 | ||
4606 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
4607 | New_Type : constant Entity_Id := Etype (New_Id); | |
4608 | Old_Formal : Entity_Id; | |
4609 | New_Formal : Entity_Id; | |
4610 | Access_Types_Match : Boolean; | |
4611 | Old_Formal_Base : Entity_Id; | |
4612 | New_Formal_Base : Entity_Id; | |
4613 | ||
996ae0b0 RK |
4614 | -- Start of processing for Check_Conformance |
4615 | ||
4616 | begin | |
4617 | Conforms := True; | |
4618 | ||
82c80734 RD |
4619 | -- We need a special case for operators, since they don't appear |
4620 | -- explicitly. | |
996ae0b0 RK |
4621 | |
4622 | if Ctype = Type_Conformant then | |
4623 | if Ekind (New_Id) = E_Operator | |
4624 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
4625 | then | |
4626 | return; | |
4627 | end if; | |
4628 | end if; | |
4629 | ||
4630 | -- If both are functions/operators, check return types conform | |
4631 | ||
4632 | if Old_Type /= Standard_Void_Type | |
3cb9a885 AC |
4633 | and then |
4634 | New_Type /= Standard_Void_Type | |
996ae0b0 | 4635 | then |
fceeaab6 ES |
4636 | -- If we are checking interface conformance we omit controlling |
4637 | -- arguments and result, because we are only checking the conformance | |
4638 | -- of the remaining parameters. | |
4639 | ||
4640 | if Has_Controlling_Result (Old_Id) | |
4641 | and then Has_Controlling_Result (New_Id) | |
4642 | and then Skip_Controlling_Formals | |
4643 | then | |
4644 | null; | |
4645 | ||
4646 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
7f568bfa AC |
4647 | if Ctype >= Subtype_Conformant |
4648 | and then not Predicates_Match (Old_Type, New_Type) | |
4649 | then | |
4650 | Conformance_Error | |
4651 | ("\predicate of return type does not match!", New_Id); | |
4652 | else | |
4653 | Conformance_Error | |
4654 | ("\return type does not match!", New_Id); | |
4655 | end if; | |
4656 | ||
996ae0b0 RK |
4657 | return; |
4658 | end if; | |
4659 | ||
41251c60 | 4660 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 4661 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 4662 | |
0791fbe9 | 4663 | if Ada_Version >= Ada_2005 |
41251c60 JM |
4664 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
4665 | and then | |
8fde064e AC |
4666 | (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
4667 | or else Is_Access_Constant (Etype (Old_Type)) /= | |
4668 | Is_Access_Constant (Etype (New_Type))) | |
41251c60 | 4669 | then |
5d37ba92 | 4670 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
4671 | return; |
4672 | end if; | |
4673 | ||
996ae0b0 RK |
4674 | -- If either is a function/operator and the other isn't, error |
4675 | ||
4676 | elsif Old_Type /= Standard_Void_Type | |
4677 | or else New_Type /= Standard_Void_Type | |
4678 | then | |
5d37ba92 | 4679 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
4680 | return; |
4681 | end if; | |
4682 | ||
0a36105d | 4683 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
4684 | -- If this is a renaming as body, refine error message to indicate that |
4685 | -- the conflict is with the original declaration. If the entity is not | |
4686 | -- frozen, the conventions don't have to match, the one of the renamed | |
4687 | -- entity is inherited. | |
4688 | ||
4689 | if Ctype >= Subtype_Conformant then | |
996ae0b0 | 4690 | if Convention (Old_Id) /= Convention (New_Id) then |
996ae0b0 RK |
4691 | if not Is_Frozen (New_Id) then |
4692 | null; | |
4693 | ||
4694 | elsif Present (Err_Loc) | |
4695 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
4696 | and then Present (Corresponding_Spec (Err_Loc)) | |
4697 | then | |
4698 | Error_Msg_Name_1 := Chars (New_Id); | |
4699 | Error_Msg_Name_2 := | |
4700 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 4701 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
4702 | |
4703 | else | |
5d37ba92 | 4704 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
4705 | end if; |
4706 | ||
4707 | return; | |
4708 | ||
4709 | elsif Is_Formal_Subprogram (Old_Id) | |
4710 | or else Is_Formal_Subprogram (New_Id) | |
4711 | then | |
5d37ba92 | 4712 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 | 4713 | return; |
c5cec2fe AC |
4714 | |
4715 | -- Pragma Ghost behaves as a convention in the context of subtype | |
10274386 AC |
4716 | -- conformance (SPARK RM 6.9(5)). Do not check internally generated |
4717 | -- subprograms as their spec may reside in a Ghost region and their | |
4718 | -- body not, or vice versa. | |
c5cec2fe | 4719 | |
10274386 AC |
4720 | elsif Comes_From_Source (Old_Id) |
4721 | and then Comes_From_Source (New_Id) | |
4722 | and then Is_Ghost_Entity (Old_Id) /= Is_Ghost_Entity (New_Id) | |
4723 | then | |
c5cec2fe AC |
4724 | Conformance_Error ("\ghost modes do not match!"); |
4725 | return; | |
996ae0b0 RK |
4726 | end if; |
4727 | end if; | |
4728 | ||
4729 | -- Deal with parameters | |
4730 | ||
4731 | -- Note: we use the entity information, rather than going directly | |
4732 | -- to the specification in the tree. This is not only simpler, but | |
4733 | -- absolutely necessary for some cases of conformance tests between | |
a90bd866 | 4734 | -- operators, where the declaration tree simply does not exist. |
996ae0b0 RK |
4735 | |
4736 | Old_Formal := First_Formal (Old_Id); | |
4737 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 4738 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
4739 | if Is_Controlling_Formal (Old_Formal) |
4740 | and then Is_Controlling_Formal (New_Formal) | |
4741 | and then Skip_Controlling_Formals | |
4742 | then | |
a2dc5812 AC |
4743 | -- The controlling formals will have different types when |
4744 | -- comparing an interface operation with its match, but both | |
4745 | -- or neither must be access parameters. | |
4746 | ||
4747 | if Is_Access_Type (Etype (Old_Formal)) | |
4748 | = | |
4749 | Is_Access_Type (Etype (New_Formal)) | |
4750 | then | |
4751 | goto Skip_Controlling_Formal; | |
4752 | else | |
4753 | Conformance_Error | |
4754 | ("\access parameter does not match!", New_Formal); | |
4755 | end if; | |
41251c60 JM |
4756 | end if; |
4757 | ||
21791d97 | 4758 | -- Ada 2012: Mode conformance also requires that formal parameters |
2a290fec AC |
4759 | -- be both aliased, or neither. |
4760 | ||
21791d97 | 4761 | if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
2a290fec AC |
4762 | if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
4763 | Conformance_Error | |
4764 | ("\aliased parameter mismatch!", New_Formal); | |
4765 | end if; | |
4766 | end if; | |
4767 | ||
fbf5a39b AC |
4768 | if Ctype = Fully_Conformant then |
4769 | ||
4770 | -- Names must match. Error message is more accurate if we do | |
4771 | -- this before checking that the types of the formals match. | |
4772 | ||
4773 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
3ccedacc | 4774 | Conformance_Error ("\name& does not match!", New_Formal); |
fbf5a39b AC |
4775 | |
4776 | -- Set error posted flag on new formal as well to stop | |
4777 | -- junk cascaded messages in some cases. | |
4778 | ||
4779 | Set_Error_Posted (New_Formal); | |
4780 | return; | |
4781 | end if; | |
40b93859 RD |
4782 | |
4783 | -- Null exclusion must match | |
4784 | ||
4785 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
4786 | /= | |
4787 | Null_Exclusion_Present (Parent (New_Formal)) | |
4788 | then | |
4789 | -- Only give error if both come from source. This should be | |
4790 | -- investigated some time, since it should not be needed ??? | |
4791 | ||
4792 | if Comes_From_Source (Old_Formal) | |
4793 | and then | |
4794 | Comes_From_Source (New_Formal) | |
4795 | then | |
4796 | Conformance_Error | |
3ccedacc | 4797 | ("\null exclusion for& does not match", New_Formal); |
40b93859 RD |
4798 | |
4799 | -- Mark error posted on the new formal to avoid duplicated | |
4800 | -- complaint about types not matching. | |
4801 | ||
4802 | Set_Error_Posted (New_Formal); | |
4803 | end if; | |
4804 | end if; | |
fbf5a39b | 4805 | end if; |
996ae0b0 | 4806 | |
ec4867fa ES |
4807 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
4808 | -- case occurs whenever a subprogram is being renamed and one of its | |
4809 | -- parameters imposes a null exclusion. For example: | |
4810 | ||
4811 | -- type T is null record; | |
4812 | -- type Acc_T is access T; | |
4813 | -- subtype Acc_T_Sub is Acc_T; | |
4814 | ||
4815 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
4816 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
4817 | -- renames P; | |
4818 | ||
4819 | Old_Formal_Base := Etype (Old_Formal); | |
4820 | New_Formal_Base := Etype (New_Formal); | |
4821 | ||
4822 | if Get_Inst then | |
4823 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
4824 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
4825 | end if; | |
4826 | ||
0791fbe9 | 4827 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa | 4828 | |
8fde064e AC |
4829 | -- Ensure that this rule is only applied when New_Id is a |
4830 | -- renaming of Old_Id. | |
ec4867fa | 4831 | |
5d37ba92 ES |
4832 | and then Nkind (Parent (Parent (New_Id))) = |
4833 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
4834 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
4835 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
4836 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
4837 | ||
8fde064e | 4838 | -- Now handle the allowed access-type case |
ec4867fa ES |
4839 | |
4840 | and then Is_Access_Type (Old_Formal_Base) | |
4841 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 | 4842 | |
8fde064e AC |
4843 | -- The type kinds must match. The only exception occurs with |
4844 | -- multiple generics of the form: | |
5d37ba92 | 4845 | |
8fde064e AC |
4846 | -- generic generic |
4847 | -- type F is private; type A is private; | |
4848 | -- type F_Ptr is access F; type A_Ptr is access A; | |
4849 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
4850 | -- package F_Pack is ... package A_Pack is | |
4851 | -- package F_Inst is | |
4852 | -- new F_Pack (A, A_Ptr, A_P); | |
5d37ba92 | 4853 | |
8fde064e AC |
4854 | -- When checking for conformance between the parameters of A_P |
4855 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
4856 | -- because the compiler has transformed A_Ptr into a subtype of | |
4857 | -- F_Ptr. We catch this case in the code below. | |
5d37ba92 ES |
4858 | |
4859 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4b6f99f5 RD |
4860 | or else |
4861 | (Is_Generic_Type (Old_Formal_Base) | |
4862 | and then Is_Generic_Type (New_Formal_Base) | |
4863 | and then Is_Internal (New_Formal_Base) | |
4864 | and then Etype (Etype (New_Formal_Base)) = | |
4865 | Old_Formal_Base)) | |
4866 | and then Directly_Designated_Type (Old_Formal_Base) = | |
4867 | Directly_Designated_Type (New_Formal_Base) | |
ec4867fa ES |
4868 | and then ((Is_Itype (Old_Formal_Base) |
4869 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
4b6f99f5 RD |
4870 | or else |
4871 | (Is_Itype (New_Formal_Base) | |
4872 | and then Can_Never_Be_Null (New_Formal_Base))); | |
ec4867fa | 4873 | |
996ae0b0 RK |
4874 | -- Types must always match. In the visible part of an instance, |
4875 | -- usual overloading rules for dispatching operations apply, and | |
4876 | -- we check base types (not the actual subtypes). | |
4877 | ||
4878 | if In_Instance_Visible_Part | |
4879 | and then Is_Dispatching_Operation (New_Id) | |
4880 | then | |
4881 | if not Conforming_Types | |
ec4867fa ES |
4882 | (T1 => Base_Type (Etype (Old_Formal)), |
4883 | T2 => Base_Type (Etype (New_Formal)), | |
4884 | Ctype => Ctype, | |
4885 | Get_Inst => Get_Inst) | |
4886 | and then not Access_Types_Match | |
996ae0b0 | 4887 | then |
5d37ba92 | 4888 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
4889 | return; |
4890 | end if; | |
4891 | ||
4892 | elsif not Conforming_Types | |
5d37ba92 ES |
4893 | (T1 => Old_Formal_Base, |
4894 | T2 => New_Formal_Base, | |
ec4867fa ES |
4895 | Ctype => Ctype, |
4896 | Get_Inst => Get_Inst) | |
4897 | and then not Access_Types_Match | |
996ae0b0 | 4898 | then |
c27f2f15 RD |
4899 | -- Don't give error message if old type is Any_Type. This test |
4900 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
4901 | ||
4902 | if Errmsg and then Old_Formal_Base = Any_Type then | |
4903 | Conforms := False; | |
4904 | else | |
7f568bfa AC |
4905 | if Ctype >= Subtype_Conformant |
4906 | and then | |
4907 | not Predicates_Match (Old_Formal_Base, New_Formal_Base) | |
4908 | then | |
4909 | Conformance_Error | |
4910 | ("\predicate of & does not match!", New_Formal); | |
4911 | else | |
4912 | Conformance_Error | |
4913 | ("\type of & does not match!", New_Formal); | |
4914 | end if; | |
c27f2f15 RD |
4915 | end if; |
4916 | ||
996ae0b0 RK |
4917 | return; |
4918 | end if; | |
4919 | ||
4920 | -- For mode conformance, mode must match | |
4921 | ||
5d37ba92 ES |
4922 | if Ctype >= Mode_Conformant then |
4923 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
4924 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
4925 | or else not Is_Primitive_Wrapper (New_Id) | |
4926 | then | |
4927 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 4928 | |
dd54644b JM |
4929 | else |
4930 | declare | |
c199ccf7 | 4931 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b | 4932 | begin |
3ccedacc | 4933 | if Is_Protected_Type (Corresponding_Concurrent_Type (T)) |
dd54644b | 4934 | then |
2c6336be | 4935 | Error_Msg_PT (New_Id, Ultimate_Alias (Old_Id)); |
dd54644b JM |
4936 | else |
4937 | Conformance_Error | |
4938 | ("\mode of & does not match!", New_Formal); | |
4939 | end if; | |
4940 | end; | |
4941 | end if; | |
4942 | ||
5d37ba92 ES |
4943 | return; |
4944 | ||
4945 | -- Part of mode conformance for access types is having the same | |
4946 | -- constant modifier. | |
4947 | ||
4948 | elsif Access_Types_Match | |
4949 | and then Is_Access_Constant (Old_Formal_Base) /= | |
4950 | Is_Access_Constant (New_Formal_Base) | |
4951 | then | |
4952 | Conformance_Error | |
4953 | ("\constant modifier does not match!", New_Formal); | |
4954 | return; | |
4955 | end if; | |
996ae0b0 RK |
4956 | end if; |
4957 | ||
0a36105d | 4958 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 4959 | |
0a36105d JM |
4960 | -- Ada 2005 (AI-231): In case of anonymous access types check |
4961 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
4962 | -- match. For null exclusion, we test the types rather than the |
4963 | -- formals themselves, since the attribute is only set reliably | |
4964 | -- on the formals in the Ada 95 case, and we exclude the case | |
4965 | -- where Old_Formal is marked as controlling, to avoid errors | |
4966 | -- when matching completing bodies with dispatching declarations | |
4967 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 4968 | |
0791fbe9 | 4969 | if Ada_Version >= Ada_2005 |
0a36105d JM |
4970 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
4971 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
4972 | and then | |
c7b9d548 AC |
4973 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
4974 | Can_Never_Be_Null (Etype (New_Formal)) | |
4975 | and then | |
4976 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
4977 | or else |
4978 | Is_Access_Constant (Etype (Old_Formal)) /= | |
4979 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
4980 | |
4981 | -- Do not complain if error already posted on New_Formal. This | |
4982 | -- avoids some redundant error messages. | |
4983 | ||
4984 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
4985 | then |
4986 | -- It is allowed to omit the null-exclusion in case of stream | |
4987 | -- attribute subprograms. We recognize stream subprograms | |
4988 | -- through their TSS-generated suffix. | |
996ae0b0 | 4989 | |
0a36105d JM |
4990 | declare |
4991 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
3ada950b | 4992 | |
0a36105d JM |
4993 | begin |
4994 | if TSS_Name /= TSS_Stream_Read | |
4995 | and then TSS_Name /= TSS_Stream_Write | |
4996 | and then TSS_Name /= TSS_Stream_Input | |
4997 | and then TSS_Name /= TSS_Stream_Output | |
4998 | then | |
3ada950b | 4999 | -- Here we have a definite conformance error. It is worth |
71fb4dc8 | 5000 | -- special casing the error message for the case of a |
3ada950b AC |
5001 | -- controlling formal (which excludes null). |
5002 | ||
5003 | if Is_Controlling_Formal (New_Formal) then | |
5004 | Error_Msg_Node_2 := Scope (New_Formal); | |
5005 | Conformance_Error | |
3ccedacc AC |
5006 | ("\controlling formal & of & excludes null, " |
5007 | & "declaration must exclude null as well", | |
5008 | New_Formal); | |
3ada950b AC |
5009 | |
5010 | -- Normal case (couldn't we give more detail here???) | |
5011 | ||
5012 | else | |
5013 | Conformance_Error | |
5014 | ("\type of & does not match!", New_Formal); | |
5015 | end if; | |
5016 | ||
0a36105d JM |
5017 | return; |
5018 | end if; | |
5019 | end; | |
5020 | end if; | |
5021 | end if; | |
41251c60 | 5022 | |
0a36105d | 5023 | -- Full conformance checks |
41251c60 | 5024 | |
0a36105d | 5025 | if Ctype = Fully_Conformant then |
e660dbf7 | 5026 | |
0a36105d | 5027 | -- We have checked already that names match |
e660dbf7 | 5028 | |
0a36105d | 5029 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
5030 | |
5031 | -- Check default expressions for in parameters | |
5032 | ||
996ae0b0 RK |
5033 | declare |
5034 | NewD : constant Boolean := | |
5035 | Present (Default_Value (New_Formal)); | |
5036 | OldD : constant Boolean := | |
5037 | Present (Default_Value (Old_Formal)); | |
5038 | begin | |
5039 | if NewD or OldD then | |
5040 | ||
82c80734 RD |
5041 | -- The old default value has been analyzed because the |
5042 | -- current full declaration will have frozen everything | |
0a36105d JM |
5043 | -- before. The new default value has not been analyzed, |
5044 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
5045 | |
5046 | if NewD then | |
0a36105d | 5047 | Push_Scope (New_Id); |
21d27997 | 5048 | Preanalyze_Spec_Expression |
fbf5a39b | 5049 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
5050 | End_Scope; |
5051 | end if; | |
5052 | ||
5053 | if not (NewD and OldD) | |
5054 | or else not Fully_Conformant_Expressions | |
5055 | (Default_Value (Old_Formal), | |
5056 | Default_Value (New_Formal)) | |
5057 | then | |
5058 | Conformance_Error | |
5d37ba92 | 5059 | ("\default expression for & does not match!", |
996ae0b0 RK |
5060 | New_Formal); |
5061 | return; | |
5062 | end if; | |
5063 | end if; | |
5064 | end; | |
5065 | end if; | |
5066 | end if; | |
5067 | ||
5068 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 5069 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
5070 | -- or if either old or new instance is not from the source program. |
5071 | ||
0ab80019 | 5072 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5073 | and then Sloc (Old_Id) > Standard_Location |
5074 | and then Sloc (New_Id) > Standard_Location | |
5075 | and then Comes_From_Source (Old_Id) | |
5076 | and then Comes_From_Source (New_Id) | |
5077 | then | |
5078 | declare | |
5079 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
5080 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
5081 | ||
5082 | begin | |
5083 | -- Explicit IN must be present or absent in both cases. This | |
5084 | -- test is required only in the full conformance case. | |
5085 | ||
5086 | if In_Present (Old_Param) /= In_Present (New_Param) | |
5087 | and then Ctype = Fully_Conformant | |
5088 | then | |
5089 | Conformance_Error | |
5d37ba92 | 5090 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
5091 | New_Formal); |
5092 | return; | |
5093 | end if; | |
5094 | ||
5095 | -- Grouping (use of comma in param lists) must be the same | |
5096 | -- This is where we catch a misconformance like: | |
5097 | ||
0a36105d | 5098 | -- A, B : Integer |
996ae0b0 RK |
5099 | -- A : Integer; B : Integer |
5100 | ||
5101 | -- which are represented identically in the tree except | |
5102 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5103 | ||
5104 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
5105 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
5106 | then | |
5107 | Conformance_Error | |
5d37ba92 | 5108 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
5109 | return; |
5110 | end if; | |
5111 | end; | |
5112 | end if; | |
5113 | ||
41251c60 JM |
5114 | -- This label is required when skipping controlling formals |
5115 | ||
5116 | <<Skip_Controlling_Formal>> | |
5117 | ||
996ae0b0 RK |
5118 | Next_Formal (Old_Formal); |
5119 | Next_Formal (New_Formal); | |
5120 | end loop; | |
5121 | ||
5122 | if Present (Old_Formal) then | |
5d37ba92 | 5123 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
5124 | return; |
5125 | ||
5126 | elsif Present (New_Formal) then | |
5d37ba92 | 5127 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
5128 | return; |
5129 | end if; | |
996ae0b0 RK |
5130 | end Check_Conformance; |
5131 | ||
ec4867fa ES |
5132 | ----------------------- |
5133 | -- Check_Conventions -- | |
5134 | ----------------------- | |
5135 | ||
5136 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 5137 | Ifaces_List : Elist_Id; |
0a36105d | 5138 | |
ce2b6ba5 | 5139 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
5140 | -- Verify that the convention of inherited dispatching operation Op is |
5141 | -- consistent among all subprograms it overrides. In order to minimize | |
5142 | -- the search, Search_From is utilized to designate a specific point in | |
5143 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
5144 | |
5145 | ---------------------- | |
5146 | -- Check_Convention -- | |
5147 | ---------------------- | |
5148 | ||
ce2b6ba5 | 5149 | procedure Check_Convention (Op : Entity_Id) is |
c5cec2fe | 5150 | Op_Conv : constant Convention_Id := Convention (Op); |
9f6aaa5c | 5151 | Iface_Conv : Convention_Id; |
ce2b6ba5 JM |
5152 | Iface_Elmt : Elmt_Id; |
5153 | Iface_Prim_Elmt : Elmt_Id; | |
5154 | Iface_Prim : Entity_Id; | |
ec4867fa | 5155 | |
ce2b6ba5 JM |
5156 | begin |
5157 | Iface_Elmt := First_Elmt (Ifaces_List); | |
5158 | while Present (Iface_Elmt) loop | |
5159 | Iface_Prim_Elmt := | |
9f6aaa5c | 5160 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
ce2b6ba5 JM |
5161 | while Present (Iface_Prim_Elmt) loop |
5162 | Iface_Prim := Node (Iface_Prim_Elmt); | |
c5cec2fe | 5163 | Iface_Conv := Convention (Iface_Prim); |
ce2b6ba5 JM |
5164 | |
5165 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
9f6aaa5c | 5166 | and then Iface_Conv /= Op_Conv |
ce2b6ba5 | 5167 | then |
ed2233dc | 5168 | Error_Msg_N |
ce2b6ba5 | 5169 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 5170 | |
ce2b6ba5 | 5171 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c | 5172 | Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
ce2b6ba5 | 5173 | Error_Msg_Sloc := Sloc (Op); |
ec4867fa | 5174 | |
7a963087 | 5175 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 5176 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 5177 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 5178 | else |
ed2233dc | 5179 | Error_Msg_N |
3ccedacc AC |
5180 | ("\\overriding operation % with " |
5181 | & "convention % defined #", Typ); | |
ce2b6ba5 | 5182 | end if; |
ec4867fa | 5183 | |
ce2b6ba5 JM |
5184 | else pragma Assert (Present (Alias (Op))); |
5185 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
3ccedacc AC |
5186 | Error_Msg_N ("\\inherited operation % with " |
5187 | & "convention % defined #", Typ); | |
ce2b6ba5 | 5188 | end if; |
ec4867fa | 5189 | |
ce2b6ba5 | 5190 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c AC |
5191 | Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
5192 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
3ccedacc AC |
5193 | Error_Msg_N ("\\overridden operation % with " |
5194 | & "convention % defined #", Typ); | |
ec4867fa | 5195 | |
ce2b6ba5 | 5196 | -- Avoid cascading errors |
ec4867fa | 5197 | |
ce2b6ba5 JM |
5198 | return; |
5199 | end if; | |
ec4867fa | 5200 | |
ce2b6ba5 JM |
5201 | Next_Elmt (Iface_Prim_Elmt); |
5202 | end loop; | |
ec4867fa | 5203 | |
ce2b6ba5 | 5204 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
5205 | end loop; |
5206 | end Check_Convention; | |
5207 | ||
5208 | -- Local variables | |
5209 | ||
5210 | Prim_Op : Entity_Id; | |
5211 | Prim_Op_Elmt : Elmt_Id; | |
5212 | ||
5213 | -- Start of processing for Check_Conventions | |
5214 | ||
5215 | begin | |
ce2b6ba5 JM |
5216 | if not Has_Interfaces (Typ) then |
5217 | return; | |
5218 | end if; | |
5219 | ||
5220 | Collect_Interfaces (Typ, Ifaces_List); | |
5221 | ||
0a36105d JM |
5222 | -- The algorithm checks every overriding dispatching operation against |
5223 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 5224 | -- differences in conventions. |
ec4867fa ES |
5225 | |
5226 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
5227 | while Present (Prim_Op_Elmt) loop | |
5228 | Prim_Op := Node (Prim_Op_Elmt); | |
5229 | ||
0a36105d | 5230 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 5231 | -- since they always have the same convention. |
ec4867fa | 5232 | |
ce2b6ba5 JM |
5233 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
5234 | Check_Convention (Prim_Op); | |
ec4867fa ES |
5235 | end if; |
5236 | ||
5237 | Next_Elmt (Prim_Op_Elmt); | |
5238 | end loop; | |
5239 | end Check_Conventions; | |
5240 | ||
996ae0b0 RK |
5241 | ------------------------------ |
5242 | -- Check_Delayed_Subprogram -- | |
5243 | ------------------------------ | |
5244 | ||
5245 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
5246 | F : Entity_Id; | |
5247 | ||
5248 | procedure Possible_Freeze (T : Entity_Id); | |
5249 | -- T is the type of either a formal parameter or of the return type. | |
5250 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
5251 | -- subprogram itself must be delayed. If T is the limited view of an |
5252 | -- incomplete type the subprogram must be frozen as well, because | |
5253 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 5254 | |
82c80734 RD |
5255 | --------------------- |
5256 | -- Possible_Freeze -- | |
5257 | --------------------- | |
5258 | ||
996ae0b0 RK |
5259 | procedure Possible_Freeze (T : Entity_Id) is |
5260 | begin | |
4a13695c | 5261 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
5262 | Set_Has_Delayed_Freeze (Designator); |
5263 | ||
5264 | elsif Is_Access_Type (T) | |
5265 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
5266 | and then not Is_Frozen (Designated_Type (T)) | |
5267 | then | |
5268 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 5269 | |
7b56a91b AC |
5270 | elsif Ekind (T) = E_Incomplete_Type |
5271 | and then From_Limited_With (T) | |
5272 | then | |
e358346d | 5273 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 5274 | |
9aff36e9 RD |
5275 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
5276 | -- of a subprogram or entry declaration. | |
406935b6 AC |
5277 | |
5278 | elsif Ekind (T) = E_Incomplete_Type | |
5279 | and then Ada_Version >= Ada_2012 | |
5280 | then | |
5281 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 5282 | end if; |
4a13695c | 5283 | |
996ae0b0 RK |
5284 | end Possible_Freeze; |
5285 | ||
5286 | -- Start of processing for Check_Delayed_Subprogram | |
5287 | ||
5288 | begin | |
76e3504f AC |
5289 | -- All subprograms, including abstract subprograms, may need a freeze |
5290 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 5291 | |
76e3504f AC |
5292 | Possible_Freeze (Etype (Designator)); |
5293 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 5294 | |
76e3504f AC |
5295 | -- Need delayed freeze if any of the formal types themselves need |
5296 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 5297 | |
76e3504f AC |
5298 | F := First_Formal (Designator); |
5299 | while Present (F) loop | |
5300 | Possible_Freeze (Etype (F)); | |
5301 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
5302 | Next_Formal (F); | |
5303 | end loop; | |
996ae0b0 RK |
5304 | |
5305 | -- Mark functions that return by reference. Note that it cannot be | |
5306 | -- done for delayed_freeze subprograms because the underlying | |
5307 | -- returned type may not be known yet (for private types) | |
5308 | ||
8fde064e | 5309 | if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
996ae0b0 RK |
5310 | declare |
5311 | Typ : constant Entity_Id := Etype (Designator); | |
5312 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
996ae0b0 | 5313 | begin |
51245e2d | 5314 | if Is_Limited_View (Typ) then |
996ae0b0 | 5315 | Set_Returns_By_Ref (Designator); |
048e5cef | 5316 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
5317 | Set_Returns_By_Ref (Designator); |
5318 | end if; | |
5319 | end; | |
5320 | end if; | |
5321 | end Check_Delayed_Subprogram; | |
5322 | ||
5323 | ------------------------------------ | |
5324 | -- Check_Discriminant_Conformance -- | |
5325 | ------------------------------------ | |
5326 | ||
5327 | procedure Check_Discriminant_Conformance | |
5328 | (N : Node_Id; | |
5329 | Prev : Entity_Id; | |
5330 | Prev_Loc : Node_Id) | |
5331 | is | |
5332 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
5333 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
5334 | New_Discr_Id : Entity_Id; | |
5335 | New_Discr_Type : Entity_Id; | |
5336 | ||
5337 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
5338 | -- Post error message for conformance error on given node. Two messages |
5339 | -- are output. The first points to the previous declaration with a | |
5340 | -- general "no conformance" message. The second is the detailed reason, | |
5341 | -- supplied as Msg. The parameter N provide information for a possible | |
5342 | -- & insertion in the message. | |
996ae0b0 RK |
5343 | |
5344 | ----------------------- | |
5345 | -- Conformance_Error -- | |
5346 | ----------------------- | |
5347 | ||
5348 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
5349 | begin | |
5350 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
5351 | Error_Msg_N -- CODEFIX |
5352 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
5353 | Error_Msg_NE (Msg, N, N); |
5354 | end Conformance_Error; | |
5355 | ||
5356 | -- Start of processing for Check_Discriminant_Conformance | |
5357 | ||
5358 | begin | |
5359 | while Present (Old_Discr) and then Present (New_Discr) loop | |
996ae0b0 RK |
5360 | New_Discr_Id := Defining_Identifier (New_Discr); |
5361 | ||
82c80734 RD |
5362 | -- The subtype mark of the discriminant on the full type has not |
5363 | -- been analyzed so we do it here. For an access discriminant a new | |
5364 | -- type is created. | |
996ae0b0 RK |
5365 | |
5366 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
5367 | New_Discr_Type := | |
5368 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
5369 | ||
5370 | else | |
5371 | Analyze (Discriminant_Type (New_Discr)); | |
5372 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
5373 | |
5374 | -- Ada 2005: if the discriminant definition carries a null | |
5375 | -- exclusion, create an itype to check properly for consistency | |
5376 | -- with partial declaration. | |
5377 | ||
5378 | if Is_Access_Type (New_Discr_Type) | |
8fde064e | 5379 | and then Null_Exclusion_Present (New_Discr) |
e50e1c5e AC |
5380 | then |
5381 | New_Discr_Type := | |
5382 | Create_Null_Excluding_Itype | |
5383 | (T => New_Discr_Type, | |
5384 | Related_Nod => New_Discr, | |
5385 | Scope_Id => Current_Scope); | |
5386 | end if; | |
996ae0b0 RK |
5387 | end if; |
5388 | ||
5389 | if not Conforming_Types | |
5390 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
5391 | then | |
5392 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
5393 | return; | |
fbf5a39b | 5394 | else |
82c80734 RD |
5395 | -- Treat the new discriminant as an occurrence of the old one, |
5396 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
5397 | -- information, for completeness. |
5398 | ||
5399 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
5400 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
5401 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
5402 | end if; |
5403 | ||
5404 | -- Names must match | |
5405 | ||
5406 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
5407 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
5408 | return; | |
5409 | end if; | |
5410 | ||
5411 | -- Default expressions must match | |
5412 | ||
5413 | declare | |
5414 | NewD : constant Boolean := | |
5415 | Present (Expression (New_Discr)); | |
5416 | OldD : constant Boolean := | |
5417 | Present (Expression (Parent (Old_Discr))); | |
5418 | ||
5419 | begin | |
5420 | if NewD or OldD then | |
5421 | ||
5422 | -- The old default value has been analyzed and expanded, | |
5423 | -- because the current full declaration will have frozen | |
82c80734 RD |
5424 | -- everything before. The new default values have not been |
5425 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
5426 | |
5427 | if NewD then | |
21d27997 | 5428 | Preanalyze_Spec_Expression |
996ae0b0 RK |
5429 | (Expression (New_Discr), New_Discr_Type); |
5430 | end if; | |
5431 | ||
5432 | if not (NewD and OldD) | |
5433 | or else not Fully_Conformant_Expressions | |
5434 | (Expression (Parent (Old_Discr)), | |
5435 | Expression (New_Discr)) | |
5436 | ||
5437 | then | |
5438 | Conformance_Error | |
5439 | ("default expression for & does not match!", | |
5440 | New_Discr_Id); | |
5441 | return; | |
5442 | end if; | |
5443 | end if; | |
5444 | end; | |
5445 | ||
5446 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
5447 | ||
0ab80019 | 5448 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
5449 | declare |
5450 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
5451 | ||
5452 | begin | |
5453 | -- Grouping (use of comma in param lists) must be the same | |
5454 | -- This is where we catch a misconformance like: | |
5455 | ||
60370fb1 | 5456 | -- A, B : Integer |
996ae0b0 RK |
5457 | -- A : Integer; B : Integer |
5458 | ||
5459 | -- which are represented identically in the tree except | |
5460 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5461 | ||
5462 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
5463 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
5464 | then | |
5465 | Conformance_Error | |
5466 | ("grouping of & does not match!", New_Discr_Id); | |
5467 | return; | |
5468 | end if; | |
5469 | end; | |
5470 | end if; | |
5471 | ||
5472 | Next_Discriminant (Old_Discr); | |
5473 | Next (New_Discr); | |
5474 | end loop; | |
5475 | ||
5476 | if Present (Old_Discr) then | |
5477 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
5478 | return; | |
5479 | ||
5480 | elsif Present (New_Discr) then | |
5481 | Conformance_Error | |
5482 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
5483 | return; | |
5484 | end if; | |
5485 | end Check_Discriminant_Conformance; | |
5486 | ||
5487 | ---------------------------- | |
5488 | -- Check_Fully_Conformant -- | |
5489 | ---------------------------- | |
5490 | ||
5491 | procedure Check_Fully_Conformant | |
5492 | (New_Id : Entity_Id; | |
5493 | Old_Id : Entity_Id; | |
5494 | Err_Loc : Node_Id := Empty) | |
5495 | is | |
5496 | Result : Boolean; | |
81db9d77 | 5497 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5498 | begin |
5499 | Check_Conformance | |
5500 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
5501 | end Check_Fully_Conformant; | |
5502 | ||
5503 | --------------------------- | |
5504 | -- Check_Mode_Conformant -- | |
5505 | --------------------------- | |
5506 | ||
5507 | procedure Check_Mode_Conformant | |
5508 | (New_Id : Entity_Id; | |
5509 | Old_Id : Entity_Id; | |
5510 | Err_Loc : Node_Id := Empty; | |
5511 | Get_Inst : Boolean := False) | |
5512 | is | |
5513 | Result : Boolean; | |
81db9d77 | 5514 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5515 | begin |
5516 | Check_Conformance | |
5517 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
5518 | end Check_Mode_Conformant; | |
5519 | ||
fbf5a39b | 5520 | -------------------------------- |
758c442c | 5521 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
5522 | -------------------------------- |
5523 | ||
758c442c | 5524 | procedure Check_Overriding_Indicator |
ec4867fa | 5525 | (Subp : Entity_Id; |
5d37ba92 ES |
5526 | Overridden_Subp : Entity_Id; |
5527 | Is_Primitive : Boolean) | |
fbf5a39b | 5528 | is |
758c442c GD |
5529 | Decl : Node_Id; |
5530 | Spec : Node_Id; | |
fbf5a39b AC |
5531 | |
5532 | begin | |
ec4867fa | 5533 | -- No overriding indicator for literals |
fbf5a39b | 5534 | |
ec4867fa | 5535 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 5536 | return; |
fbf5a39b | 5537 | |
ec4867fa ES |
5538 | elsif Ekind (Subp) = E_Entry then |
5539 | Decl := Parent (Subp); | |
5540 | ||
53b10ce9 AC |
5541 | -- No point in analyzing a malformed operator |
5542 | ||
5543 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
5544 | and then Error_Posted (Subp) | |
5545 | then | |
5546 | return; | |
5547 | ||
758c442c GD |
5548 | else |
5549 | Decl := Unit_Declaration_Node (Subp); | |
5550 | end if; | |
fbf5a39b | 5551 | |
800621e0 RD |
5552 | if Nkind_In (Decl, N_Subprogram_Body, |
5553 | N_Subprogram_Body_Stub, | |
5554 | N_Subprogram_Declaration, | |
5555 | N_Abstract_Subprogram_Declaration, | |
5556 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
5557 | then |
5558 | Spec := Specification (Decl); | |
ec4867fa ES |
5559 | |
5560 | elsif Nkind (Decl) = N_Entry_Declaration then | |
5561 | Spec := Decl; | |
5562 | ||
758c442c GD |
5563 | else |
5564 | return; | |
5565 | end if; | |
fbf5a39b | 5566 | |
e7d72fb9 AC |
5567 | -- The overriding operation is type conformant with the overridden one, |
5568 | -- but the names of the formals are not required to match. If the names | |
6823270c | 5569 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
5570 | -- source of confusion that is worth diagnosing. Controlling formals |
5571 | -- often carry names that reflect the type, and it is not worthwhile | |
5572 | -- requiring that their names match. | |
5573 | ||
c9e7bd8e | 5574 | if Present (Overridden_Subp) |
e7d72fb9 AC |
5575 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
5576 | then | |
5577 | declare | |
5578 | Form1 : Entity_Id; | |
5579 | Form2 : Entity_Id; | |
5580 | ||
5581 | begin | |
5582 | Form1 := First_Formal (Subp); | |
5583 | Form2 := First_Formal (Overridden_Subp); | |
5584 | ||
c9e7bd8e AC |
5585 | -- If the overriding operation is a synchronized operation, skip |
5586 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
5587 | -- implicit in the new one. If the operation is declared in the |
5588 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 5589 | |
6823270c AC |
5590 | if Is_Concurrent_Type (Scope (Subp)) |
5591 | and then Is_Tagged_Type (Scope (Subp)) | |
5592 | and then not Has_Completion (Scope (Subp)) | |
5593 | then | |
c9e7bd8e AC |
5594 | Form2 := Next_Formal (Form2); |
5595 | end if; | |
5596 | ||
e7d72fb9 AC |
5597 | if Present (Form1) then |
5598 | Form1 := Next_Formal (Form1); | |
5599 | Form2 := Next_Formal (Form2); | |
5600 | end if; | |
5601 | ||
5602 | while Present (Form1) loop | |
5603 | if not Is_Controlling_Formal (Form1) | |
5604 | and then Present (Next_Formal (Form2)) | |
5605 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
5606 | then | |
5607 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
5608 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 5609 | Error_Msg_NE |
19d846a0 | 5610 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
5611 | Form1, Form1); |
5612 | exit; | |
5613 | end if; | |
5614 | ||
5615 | Next_Formal (Form1); | |
5616 | Next_Formal (Form2); | |
5617 | end loop; | |
5618 | end; | |
5619 | end if; | |
5620 | ||
676e8420 AC |
5621 | -- If there is an overridden subprogram, then check that there is no |
5622 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
5623 | -- This is not done if the overridden subprogram is marked as hidden, |
5624 | -- which can occur for the case of inherited controlled operations | |
5625 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
5626 | -- subprogram is not itself hidden. (Note: This condition could probably | |
5627 | -- be simplified, leaving out the testing for the specific controlled | |
5628 | -- cases, but it seems safer and clearer this way, and echoes similar | |
5629 | -- special-case tests of this kind in other places.) | |
5630 | ||
fd0d899b | 5631 | if Present (Overridden_Subp) |
51bf9bdf AC |
5632 | and then (not Is_Hidden (Overridden_Subp) |
5633 | or else | |
b69cd36a AC |
5634 | (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
5635 | Name_Adjust, | |
5636 | Name_Finalize) | |
f0709ca6 AC |
5637 | and then Present (Alias (Overridden_Subp)) |
5638 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 5639 | then |
ec4867fa ES |
5640 | if Must_Not_Override (Spec) then |
5641 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 5642 | |
ec4867fa | 5643 | if Ekind (Subp) = E_Entry then |
ed2233dc | 5644 | Error_Msg_NE |
5d37ba92 | 5645 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5646 | else |
ed2233dc | 5647 | Error_Msg_NE |
5d37ba92 | 5648 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5649 | end if; |
21d27997 | 5650 | |
bd603506 | 5651 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
5652 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
5653 | -- operation. This operation should not be inherited by other limited | |
5654 | -- controlled types. An explicit Adjust for them is not overriding. | |
5655 | ||
5656 | elsif Must_Override (Spec) | |
5657 | and then Chars (Overridden_Subp) = Name_Adjust | |
5658 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
5659 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
5660 | and then |
5661 | Is_Predefined_File_Name | |
5662 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
5663 | then |
5664 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5665 | ||
21d27997 | 5666 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
5667 | if Is_Init_Proc (Subp) then |
5668 | null; | |
5669 | ||
5670 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
5671 | |
5672 | -- For entities generated by Derive_Subprograms the overridden | |
5673 | -- operation is the inherited primitive (which is available | |
5674 | -- through the attribute alias) | |
5675 | ||
5676 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 5677 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 5678 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
5679 | and then Find_Dispatching_Type (Overridden_Subp) = |
5680 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
5681 | and then Present (Alias (Overridden_Subp)) |
5682 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
5683 | then | |
039538bc AC |
5684 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); |
5685 | Inherit_Subprogram_Contract (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 5686 | |
1c1289e7 | 5687 | else |
039538bc AC |
5688 | Set_Overridden_Operation (Subp, Overridden_Subp); |
5689 | Inherit_Subprogram_Contract (Subp, Overridden_Subp); | |
1c1289e7 AC |
5690 | end if; |
5691 | end if; | |
ec4867fa | 5692 | end if; |
f937473f | 5693 | |
618fb570 AC |
5694 | -- If primitive flag is set or this is a protected operation, then |
5695 | -- the operation is overriding at the point of its declaration, so | |
5696 | -- warn if necessary. Otherwise it may have been declared before the | |
5697 | -- operation it overrides and no check is required. | |
3c25856a AC |
5698 | |
5699 | if Style_Check | |
618fb570 AC |
5700 | and then not Must_Override (Spec) |
5701 | and then (Is_Primitive | |
5702 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 5703 | then |
235f4375 AC |
5704 | Style.Missing_Overriding (Decl, Subp); |
5705 | end if; | |
5706 | ||
53b10ce9 AC |
5707 | -- If Subp is an operator, it may override a predefined operation, if |
5708 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 5709 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
5710 | -- representation for predefined operators. We have to check whether the |
5711 | -- signature of Subp matches that of a predefined operator. Note that | |
5712 | -- first argument provides the name of the operator, and the second | |
5713 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
5714 | -- If the indicator is overriding, then the operator must match a |
5715 | -- predefined signature, because we know already that there is no | |
5716 | -- explicit overridden operation. | |
f937473f | 5717 | |
21d27997 | 5718 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 5719 | if Must_Not_Override (Spec) then |
f937473f | 5720 | |
806f6d37 AC |
5721 | -- If this is not a primitive or a protected subprogram, then |
5722 | -- "not overriding" is illegal. | |
618fb570 | 5723 | |
806f6d37 AC |
5724 | if not Is_Primitive |
5725 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5726 | then | |
3ccedacc AC |
5727 | Error_Msg_N ("overriding indicator only allowed " |
5728 | & "if subprogram is primitive", Subp); | |
618fb570 | 5729 | |
806f6d37 AC |
5730 | elsif Can_Override_Operator (Subp) then |
5731 | Error_Msg_NE | |
5732 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
5733 | end if; | |
f937473f | 5734 | |
806f6d37 AC |
5735 | elsif Must_Override (Spec) then |
5736 | if No (Overridden_Operation (Subp)) | |
5737 | and then not Can_Override_Operator (Subp) | |
5738 | then | |
5739 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5740 | end if; | |
5d37ba92 | 5741 | |
806f6d37 AC |
5742 | elsif not Error_Posted (Subp) |
5743 | and then Style_Check | |
5744 | and then Can_Override_Operator (Subp) | |
5745 | and then | |
5746 | not Is_Predefined_File_Name | |
5747 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
5748 | then | |
5749 | -- If style checks are enabled, indicate that the indicator is | |
5750 | -- missing. However, at the point of declaration, the type of | |
5751 | -- which this is a primitive operation may be private, in which | |
5752 | -- case the indicator would be premature. | |
235f4375 | 5753 | |
806f6d37 AC |
5754 | if Has_Private_Declaration (Etype (Subp)) |
5755 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 5756 | then |
806f6d37 AC |
5757 | null; |
5758 | else | |
5759 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 5760 | end if; |
806f6d37 | 5761 | end if; |
21d27997 RD |
5762 | |
5763 | elsif Must_Override (Spec) then | |
5764 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 5765 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 5766 | else |
ed2233dc | 5767 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 5768 | end if; |
5d37ba92 ES |
5769 | |
5770 | -- If the operation is marked "not overriding" and it's not primitive | |
5771 | -- then an error is issued, unless this is an operation of a task or | |
5772 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
5773 | -- has been specified have already been checked above. | |
5774 | ||
5775 | elsif Must_Not_Override (Spec) | |
5776 | and then not Is_Primitive | |
5777 | and then Ekind (Subp) /= E_Entry | |
5778 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5779 | then | |
ed2233dc | 5780 | Error_Msg_N |
5d37ba92 ES |
5781 | ("overriding indicator only allowed if subprogram is primitive", |
5782 | Subp); | |
5d37ba92 | 5783 | return; |
fbf5a39b | 5784 | end if; |
758c442c | 5785 | end Check_Overriding_Indicator; |
fbf5a39b | 5786 | |
996ae0b0 RK |
5787 | ------------------- |
5788 | -- Check_Returns -- | |
5789 | ------------------- | |
5790 | ||
0a36105d JM |
5791 | -- Note: this procedure needs to know far too much about how the expander |
5792 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
5793 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
5794 | -- works, but is not very clean. It would be better if the expansion | |
5795 | -- routines would leave Original_Node working nicely, and we could use | |
5796 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
5797 | ||
996ae0b0 RK |
5798 | procedure Check_Returns |
5799 | (HSS : Node_Id; | |
5800 | Mode : Character; | |
c8ef728f ES |
5801 | Err : out Boolean; |
5802 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
5803 | is |
5804 | Handler : Node_Id; | |
5805 | ||
5806 | procedure Check_Statement_Sequence (L : List_Id); | |
5807 | -- Internal recursive procedure to check a list of statements for proper | |
5808 | -- termination by a return statement (or a transfer of control or a | |
5809 | -- compound statement that is itself internally properly terminated). | |
5810 | ||
5811 | ------------------------------ | |
5812 | -- Check_Statement_Sequence -- | |
5813 | ------------------------------ | |
5814 | ||
5815 | procedure Check_Statement_Sequence (L : List_Id) is | |
5816 | Last_Stm : Node_Id; | |
0a36105d | 5817 | Stm : Node_Id; |
996ae0b0 RK |
5818 | Kind : Node_Kind; |
5819 | ||
7b27e183 AC |
5820 | function Assert_False return Boolean; |
5821 | -- Returns True if Last_Stm is a pragma Assert (False) that has been | |
5822 | -- rewritten as a null statement when assertions are off. The assert | |
5823 | -- is not active, but it is still enough to kill the warning. | |
5824 | ||
5825 | ------------------ | |
5826 | -- Assert_False -- | |
5827 | ------------------ | |
5828 | ||
5829 | function Assert_False return Boolean is | |
5830 | Orig : constant Node_Id := Original_Node (Last_Stm); | |
5831 | ||
5832 | begin | |
5833 | if Nkind (Orig) = N_Pragma | |
5834 | and then Pragma_Name (Orig) = Name_Assert | |
5835 | and then not Error_Posted (Orig) | |
5836 | then | |
5837 | declare | |
5838 | Arg : constant Node_Id := | |
5839 | First (Pragma_Argument_Associations (Orig)); | |
5840 | Exp : constant Node_Id := Expression (Arg); | |
5841 | begin | |
5842 | return Nkind (Exp) = N_Identifier | |
5843 | and then Chars (Exp) = Name_False; | |
5844 | end; | |
5845 | ||
5846 | else | |
5847 | return False; | |
5848 | end if; | |
5849 | end Assert_False; | |
5850 | ||
5851 | -- Local variables | |
5852 | ||
996ae0b0 RK |
5853 | Raise_Exception_Call : Boolean; |
5854 | -- Set True if statement sequence terminated by Raise_Exception call | |
5855 | -- or a Reraise_Occurrence call. | |
5856 | ||
7b27e183 AC |
5857 | -- Start of processing for Check_Statement_Sequence |
5858 | ||
996ae0b0 RK |
5859 | begin |
5860 | Raise_Exception_Call := False; | |
5861 | ||
5862 | -- Get last real statement | |
5863 | ||
5864 | Last_Stm := Last (L); | |
5865 | ||
0a36105d JM |
5866 | -- Deal with digging out exception handler statement sequences that |
5867 | -- have been transformed by the local raise to goto optimization. | |
5868 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
5869 | -- optimization has occurred, we are looking at something like: | |
5870 | ||
5871 | -- begin | |
5872 | -- original stmts in block | |
5873 | ||
5874 | -- exception \ | |
5875 | -- when excep1 => | | |
5876 | -- goto L1; | omitted if No_Exception_Propagation | |
5877 | -- when excep2 => | | |
5878 | -- goto L2; / | |
5879 | -- end; | |
5880 | ||
5881 | -- goto L3; -- skip handler when exception not raised | |
5882 | ||
5883 | -- <<L1>> -- target label for local exception | |
5884 | -- begin | |
5885 | -- estmts1 | |
5886 | -- end; | |
5887 | ||
5888 | -- goto L3; | |
5889 | ||
5890 | -- <<L2>> | |
5891 | -- begin | |
5892 | -- estmts2 | |
5893 | -- end; | |
5894 | ||
5895 | -- <<L3>> | |
5896 | ||
5897 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
5898 | -- sequences (which were the original sequences of statements in | |
5899 | -- the exception handlers) and check them. | |
5900 | ||
8fde064e | 5901 | if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
0a36105d JM |
5902 | Stm := Last_Stm; |
5903 | loop | |
5904 | Prev (Stm); | |
5905 | exit when No (Stm); | |
5906 | exit when Nkind (Stm) /= N_Block_Statement; | |
5907 | exit when not Exception_Junk (Stm); | |
5908 | Prev (Stm); | |
5909 | exit when No (Stm); | |
5910 | exit when Nkind (Stm) /= N_Label; | |
5911 | exit when not Exception_Junk (Stm); | |
5912 | Check_Statement_Sequence | |
5913 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
5914 | ||
5915 | Prev (Stm); | |
5916 | Last_Stm := Stm; | |
5917 | exit when No (Stm); | |
5918 | exit when Nkind (Stm) /= N_Goto_Statement; | |
5919 | exit when not Exception_Junk (Stm); | |
5920 | end loop; | |
5921 | end if; | |
5922 | ||
996ae0b0 RK |
5923 | -- Don't count pragmas |
5924 | ||
5925 | while Nkind (Last_Stm) = N_Pragma | |
5926 | ||
5927 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
5928 | ||
5929 | or else | |
5930 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
5931 | and then | |
5932 | Nkind (Name (Last_Stm)) = N_Identifier | |
5933 | and then | |
5934 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
5935 | ||
5936 | -- Don't count exception junk | |
5937 | ||
5938 | or else | |
800621e0 RD |
5939 | (Nkind_In (Last_Stm, N_Goto_Statement, |
5940 | N_Label, | |
5941 | N_Object_Declaration) | |
8fde064e | 5942 | and then Exception_Junk (Last_Stm)) |
0a36105d JM |
5943 | or else Nkind (Last_Stm) in N_Push_xxx_Label |
5944 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
e3b3266c AC |
5945 | |
5946 | -- Inserted code, such as finalization calls, is irrelevant: we only | |
5947 | -- need to check original source. | |
5948 | ||
5949 | or else Is_Rewrite_Insertion (Last_Stm) | |
996ae0b0 RK |
5950 | loop |
5951 | Prev (Last_Stm); | |
5952 | end loop; | |
5953 | ||
5954 | -- Here we have the "real" last statement | |
5955 | ||
5956 | Kind := Nkind (Last_Stm); | |
5957 | ||
5958 | -- Transfer of control, OK. Note that in the No_Return procedure | |
5959 | -- case, we already diagnosed any explicit return statements, so | |
5960 | -- we can treat them as OK in this context. | |
5961 | ||
5962 | if Is_Transfer (Last_Stm) then | |
5963 | return; | |
5964 | ||
5965 | -- Check cases of explicit non-indirect procedure calls | |
5966 | ||
5967 | elsif Kind = N_Procedure_Call_Statement | |
5968 | and then Is_Entity_Name (Name (Last_Stm)) | |
5969 | then | |
5970 | -- Check call to Raise_Exception procedure which is treated | |
5971 | -- specially, as is a call to Reraise_Occurrence. | |
5972 | ||
5973 | -- We suppress the warning in these cases since it is likely that | |
5974 | -- the programmer really does not expect to deal with the case | |
5975 | -- of Null_Occurrence, and thus would find a warning about a | |
5976 | -- missing return curious, and raising Program_Error does not | |
5977 | -- seem such a bad behavior if this does occur. | |
5978 | ||
c8ef728f ES |
5979 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
5980 | -- behavior will be to raise Constraint_Error (see AI-329). | |
5981 | ||
996ae0b0 RK |
5982 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
5983 | or else | |
5984 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
5985 | then | |
5986 | Raise_Exception_Call := True; | |
5987 | ||
5988 | -- For Raise_Exception call, test first argument, if it is | |
5989 | -- an attribute reference for a 'Identity call, then we know | |
5990 | -- that the call cannot possibly return. | |
5991 | ||
5992 | declare | |
5993 | Arg : constant Node_Id := | |
5994 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
5995 | begin |
5996 | if Nkind (Arg) = N_Attribute_Reference | |
5997 | and then Attribute_Name (Arg) = Name_Identity | |
5998 | then | |
5999 | return; | |
6000 | end if; | |
6001 | end; | |
6002 | end if; | |
6003 | ||
6004 | -- If statement, need to look inside if there is an else and check | |
6005 | -- each constituent statement sequence for proper termination. | |
6006 | ||
6007 | elsif Kind = N_If_Statement | |
6008 | and then Present (Else_Statements (Last_Stm)) | |
6009 | then | |
6010 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
6011 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6012 | ||
6013 | if Present (Elsif_Parts (Last_Stm)) then | |
6014 | declare | |
6015 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
6016 | ||
6017 | begin | |
6018 | while Present (Elsif_Part) loop | |
6019 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
6020 | Next (Elsif_Part); | |
6021 | end loop; | |
6022 | end; | |
6023 | end if; | |
6024 | ||
6025 | return; | |
6026 | ||
6027 | -- Case statement, check each case for proper termination | |
6028 | ||
6029 | elsif Kind = N_Case_Statement then | |
6030 | declare | |
6031 | Case_Alt : Node_Id; | |
996ae0b0 RK |
6032 | begin |
6033 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
6034 | while Present (Case_Alt) loop | |
6035 | Check_Statement_Sequence (Statements (Case_Alt)); | |
6036 | Next_Non_Pragma (Case_Alt); | |
6037 | end loop; | |
6038 | end; | |
6039 | ||
6040 | return; | |
6041 | ||
6042 | -- Block statement, check its handled sequence of statements | |
6043 | ||
6044 | elsif Kind = N_Block_Statement then | |
6045 | declare | |
6046 | Err1 : Boolean; | |
6047 | ||
6048 | begin | |
6049 | Check_Returns | |
6050 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
6051 | ||
6052 | if Err1 then | |
6053 | Err := True; | |
6054 | end if; | |
6055 | ||
6056 | return; | |
6057 | end; | |
6058 | ||
6059 | -- Loop statement. If there is an iteration scheme, we can definitely | |
6060 | -- fall out of the loop. Similarly if there is an exit statement, we | |
6061 | -- can fall out. In either case we need a following return. | |
6062 | ||
6063 | elsif Kind = N_Loop_Statement then | |
6064 | if Present (Iteration_Scheme (Last_Stm)) | |
6065 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
6066 | then | |
6067 | null; | |
6068 | ||
f3d57416 RW |
6069 | -- A loop with no exit statement or iteration scheme is either |
6070 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
6071 | -- In either case, no warning is required. |
6072 | ||
6073 | else | |
6074 | return; | |
6075 | end if; | |
6076 | ||
6077 | -- Timed entry call, check entry call and delay alternatives | |
6078 | ||
6079 | -- Note: in expanded code, the timed entry call has been converted | |
6080 | -- to a set of expanded statements on which the check will work | |
6081 | -- correctly in any case. | |
6082 | ||
6083 | elsif Kind = N_Timed_Entry_Call then | |
6084 | declare | |
6085 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6086 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
6087 | ||
6088 | begin | |
6089 | -- If statement sequence of entry call alternative is missing, | |
6090 | -- then we can definitely fall through, and we post the error | |
6091 | -- message on the entry call alternative itself. | |
6092 | ||
6093 | if No (Statements (ECA)) then | |
6094 | Last_Stm := ECA; | |
6095 | ||
6096 | -- If statement sequence of delay alternative is missing, then | |
6097 | -- we can definitely fall through, and we post the error | |
6098 | -- message on the delay alternative itself. | |
6099 | ||
6100 | -- Note: if both ECA and DCA are missing the return, then we | |
6101 | -- post only one message, should be enough to fix the bugs. | |
6102 | -- If not we will get a message next time on the DCA when the | |
a90bd866 | 6103 | -- ECA is fixed. |
996ae0b0 RK |
6104 | |
6105 | elsif No (Statements (DCA)) then | |
6106 | Last_Stm := DCA; | |
6107 | ||
6108 | -- Else check both statement sequences | |
6109 | ||
6110 | else | |
6111 | Check_Statement_Sequence (Statements (ECA)); | |
6112 | Check_Statement_Sequence (Statements (DCA)); | |
6113 | return; | |
6114 | end if; | |
6115 | end; | |
6116 | ||
6117 | -- Conditional entry call, check entry call and else part | |
6118 | ||
6119 | -- Note: in expanded code, the conditional entry call has been | |
6120 | -- converted to a set of expanded statements on which the check | |
6121 | -- will work correctly in any case. | |
6122 | ||
6123 | elsif Kind = N_Conditional_Entry_Call then | |
6124 | declare | |
6125 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6126 | ||
6127 | begin | |
6128 | -- If statement sequence of entry call alternative is missing, | |
6129 | -- then we can definitely fall through, and we post the error | |
6130 | -- message on the entry call alternative itself. | |
6131 | ||
6132 | if No (Statements (ECA)) then | |
6133 | Last_Stm := ECA; | |
6134 | ||
6135 | -- Else check statement sequence and else part | |
6136 | ||
6137 | else | |
6138 | Check_Statement_Sequence (Statements (ECA)); | |
6139 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6140 | return; | |
6141 | end if; | |
6142 | end; | |
6143 | end if; | |
6144 | ||
6145 | -- If we fall through, issue appropriate message | |
6146 | ||
6147 | if Mode = 'F' then | |
7b27e183 AC |
6148 | |
6149 | -- Kill warning if last statement is a raise exception call, | |
6150 | -- or a pragma Assert (False). Note that with assertions enabled, | |
6151 | -- such a pragma has been converted into a raise exception call | |
6152 | -- already, so the Assert_False is for the assertions off case. | |
6153 | ||
6154 | if not Raise_Exception_Call and then not Assert_False then | |
b465ef6f AC |
6155 | |
6156 | -- In GNATprove mode, it is an error to have a missing return | |
6157 | ||
43417b90 | 6158 | Error_Msg_Warn := SPARK_Mode /= On; |
7b27e183 AC |
6159 | |
6160 | -- Issue error message or warning | |
6161 | ||
4a28b181 AC |
6162 | Error_Msg_N |
6163 | ("RETURN statement missing following this statement<<!", | |
6164 | Last_Stm); | |
6165 | Error_Msg_N | |
6166 | ("\Program_Error ]<<!", Last_Stm); | |
996ae0b0 RK |
6167 | end if; |
6168 | ||
6169 | -- Note: we set Err even though we have not issued a warning | |
6170 | -- because we still have a case of a missing return. This is | |
6171 | -- an extremely marginal case, probably will never be noticed | |
6172 | -- but we might as well get it right. | |
6173 | ||
6174 | Err := True; | |
6175 | ||
c8ef728f ES |
6176 | -- Otherwise we have the case of a procedure marked No_Return |
6177 | ||
996ae0b0 | 6178 | else |
800621e0 | 6179 | if not Raise_Exception_Call then |
4a28b181 AC |
6180 | if GNATprove_Mode then |
6181 | Error_Msg_N | |
6182 | ("implied return after this statement " | |
6183 | & "would have raised Program_Error", Last_Stm); | |
6184 | else | |
6185 | Error_Msg_N | |
6186 | ("implied return after this statement " | |
6187 | & "will raise Program_Error??", Last_Stm); | |
6188 | end if; | |
6189 | ||
43417b90 | 6190 | Error_Msg_Warn := SPARK_Mode /= On; |
800621e0 | 6191 | Error_Msg_NE |
4a28b181 | 6192 | ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
800621e0 | 6193 | end if; |
c8ef728f ES |
6194 | |
6195 | declare | |
6196 | RE : constant Node_Id := | |
6197 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
6198 | Reason => PE_Implicit_Return); | |
6199 | begin | |
6200 | Insert_After (Last_Stm, RE); | |
6201 | Analyze (RE); | |
6202 | end; | |
996ae0b0 RK |
6203 | end if; |
6204 | end Check_Statement_Sequence; | |
6205 | ||
6206 | -- Start of processing for Check_Returns | |
6207 | ||
6208 | begin | |
6209 | Err := False; | |
6210 | Check_Statement_Sequence (Statements (HSS)); | |
6211 | ||
6212 | if Present (Exception_Handlers (HSS)) then | |
6213 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
6214 | while Present (Handler) loop | |
6215 | Check_Statement_Sequence (Statements (Handler)); | |
6216 | Next_Non_Pragma (Handler); | |
6217 | end loop; | |
6218 | end if; | |
6219 | end Check_Returns; | |
6220 | ||
6221 | ---------------------------- | |
6222 | -- Check_Subprogram_Order -- | |
6223 | ---------------------------- | |
6224 | ||
6225 | procedure Check_Subprogram_Order (N : Node_Id) is | |
6226 | ||
6227 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
6228 | -- This is used to check if S1 > S2 in the sense required by this test, |
6229 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 6230 | |
82c80734 RD |
6231 | ----------------------------- |
6232 | -- Subprogram_Name_Greater -- | |
6233 | ----------------------------- | |
6234 | ||
996ae0b0 RK |
6235 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
6236 | L1, L2 : Positive; | |
6237 | N1, N2 : Natural; | |
6238 | ||
6239 | begin | |
67336960 AC |
6240 | -- Deal with special case where names are identical except for a |
6241 | -- numerical suffix. These are handled specially, taking the numeric | |
6242 | -- ordering from the suffix into account. | |
996ae0b0 RK |
6243 | |
6244 | L1 := S1'Last; | |
6245 | while S1 (L1) in '0' .. '9' loop | |
6246 | L1 := L1 - 1; | |
6247 | end loop; | |
6248 | ||
6249 | L2 := S2'Last; | |
6250 | while S2 (L2) in '0' .. '9' loop | |
6251 | L2 := L2 - 1; | |
6252 | end loop; | |
6253 | ||
67336960 | 6254 | -- If non-numeric parts non-equal, do straight compare |
996ae0b0 | 6255 | |
67336960 AC |
6256 | if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
6257 | return S1 > S2; | |
996ae0b0 RK |
6258 | |
6259 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
6260 | -- that a missing suffix is treated as numeric zero in this test. | |
6261 | ||
6262 | else | |
6263 | N1 := 0; | |
6264 | while L1 < S1'Last loop | |
6265 | L1 := L1 + 1; | |
6266 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
6267 | end loop; | |
6268 | ||
6269 | N2 := 0; | |
6270 | while L2 < S2'Last loop | |
6271 | L2 := L2 + 1; | |
6272 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
6273 | end loop; | |
6274 | ||
6275 | return N1 > N2; | |
6276 | end if; | |
6277 | end Subprogram_Name_Greater; | |
6278 | ||
6279 | -- Start of processing for Check_Subprogram_Order | |
6280 | ||
6281 | begin | |
6282 | -- Check body in alpha order if this is option | |
6283 | ||
fbf5a39b | 6284 | if Style_Check |
bc202b70 | 6285 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
6286 | and then Nkind (N) = N_Subprogram_Body |
6287 | and then Comes_From_Source (N) | |
6288 | and then In_Extended_Main_Source_Unit (N) | |
6289 | then | |
6290 | declare | |
6291 | LSN : String_Ptr | |
6292 | renames Scope_Stack.Table | |
6293 | (Scope_Stack.Last).Last_Subprogram_Name; | |
6294 | ||
6295 | Body_Id : constant Entity_Id := | |
6296 | Defining_Entity (Specification (N)); | |
6297 | ||
6298 | begin | |
6299 | Get_Decoded_Name_String (Chars (Body_Id)); | |
6300 | ||
6301 | if LSN /= null then | |
6302 | if Subprogram_Name_Greater | |
6303 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
6304 | then | |
6305 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
6306 | end if; | |
6307 | ||
6308 | Free (LSN); | |
6309 | end if; | |
6310 | ||
6311 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
6312 | end; | |
6313 | end if; | |
6314 | end Check_Subprogram_Order; | |
6315 | ||
6316 | ------------------------------ | |
6317 | -- Check_Subtype_Conformant -- | |
6318 | ------------------------------ | |
6319 | ||
6320 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
6321 | (New_Id : Entity_Id; |
6322 | Old_Id : Entity_Id; | |
6323 | Err_Loc : Node_Id := Empty; | |
f307415a AC |
6324 | Skip_Controlling_Formals : Boolean := False; |
6325 | Get_Inst : Boolean := False) | |
996ae0b0 RK |
6326 | is |
6327 | Result : Boolean; | |
81db9d77 | 6328 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6329 | begin |
6330 | Check_Conformance | |
ce2b6ba5 | 6331 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
f307415a AC |
6332 | Skip_Controlling_Formals => Skip_Controlling_Formals, |
6333 | Get_Inst => Get_Inst); | |
996ae0b0 RK |
6334 | end Check_Subtype_Conformant; |
6335 | ||
6336 | --------------------------- | |
6337 | -- Check_Type_Conformant -- | |
6338 | --------------------------- | |
6339 | ||
6340 | procedure Check_Type_Conformant | |
6341 | (New_Id : Entity_Id; | |
6342 | Old_Id : Entity_Id; | |
6343 | Err_Loc : Node_Id := Empty) | |
6344 | is | |
6345 | Result : Boolean; | |
81db9d77 | 6346 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6347 | begin |
6348 | Check_Conformance | |
6349 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
6350 | end Check_Type_Conformant; | |
6351 | ||
806f6d37 AC |
6352 | --------------------------- |
6353 | -- Can_Override_Operator -- | |
6354 | --------------------------- | |
6355 | ||
6356 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
6357 | Typ : Entity_Id; | |
f146302c | 6358 | |
806f6d37 AC |
6359 | begin |
6360 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
6361 | return False; | |
6362 | ||
6363 | else | |
6364 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
6365 | ||
f146302c AC |
6366 | -- Check explicitly that the operation is a primitive of the type |
6367 | ||
806f6d37 | 6368 | return Operator_Matches_Spec (Subp, Subp) |
f146302c | 6369 | and then not Is_Generic_Type (Typ) |
806f6d37 AC |
6370 | and then Scope (Subp) = Scope (Typ) |
6371 | and then not Is_Class_Wide_Type (Typ); | |
6372 | end if; | |
6373 | end Can_Override_Operator; | |
6374 | ||
996ae0b0 RK |
6375 | ---------------------- |
6376 | -- Conforming_Types -- | |
6377 | ---------------------- | |
6378 | ||
6379 | function Conforming_Types | |
6380 | (T1 : Entity_Id; | |
6381 | T2 : Entity_Id; | |
6382 | Ctype : Conformance_Type; | |
d05ef0ab | 6383 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
6384 | is |
6385 | Type_1 : Entity_Id := T1; | |
6386 | Type_2 : Entity_Id := T2; | |
af4b9434 | 6387 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
6388 | |
6389 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
6390 | -- If neither T1 nor T2 are generic actual types, or if they are in |
6391 | -- different scopes (e.g. parent and child instances), then verify that | |
6392 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
6393 | -- subtype chain. The whole purpose of this procedure is to prevent | |
6394 | -- spurious ambiguities in an instantiation that may arise if two | |
6395 | -- distinct generic types are instantiated with the same actual. | |
6396 | ||
5d37ba92 ES |
6397 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
6398 | -- An access parameter can designate an incomplete type. If the | |
6399 | -- incomplete type is the limited view of a type from a limited_ | |
6400 | -- with_clause, check whether the non-limited view is available. If | |
6401 | -- it is a (non-limited) incomplete type, get the full view. | |
6402 | ||
0a36105d JM |
6403 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
6404 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
6405 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
6406 | -- with view of a type is used in a subprogram declaration and the | |
6407 | -- subprogram body is in the scope of a regular with clause for the | |
6408 | -- same unit. In such a case, the two type entities can be considered | |
6409 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
6410 | |
6411 | ---------------------- | |
6412 | -- Base_Types_Match -- | |
6413 | ---------------------- | |
6414 | ||
6415 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
8fde064e AC |
6416 | BT1 : constant Entity_Id := Base_Type (T1); |
6417 | BT2 : constant Entity_Id := Base_Type (T2); | |
6418 | ||
996ae0b0 RK |
6419 | begin |
6420 | if T1 = T2 then | |
6421 | return True; | |
6422 | ||
8fde064e | 6423 | elsif BT1 = BT2 then |
996ae0b0 | 6424 | |
0a36105d | 6425 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
6426 | -- check that the generic actual is an ancestor subtype of the |
6427 | -- other ???. | |
586ecbf3 | 6428 | |
70f4ad20 AC |
6429 | -- See code in Find_Corresponding_Spec that applies an additional |
6430 | -- filter to handle accidental amiguities in instances. | |
996ae0b0 RK |
6431 | |
6432 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
6433 | or else not Is_Generic_Actual_Type (T2) |
6434 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 6435 | |
8fde064e | 6436 | -- If T2 is a generic actual type it is declared as the subtype of |
2995860f AC |
6437 | -- the actual. If that actual is itself a subtype we need to use its |
6438 | -- own base type to check for compatibility. | |
8fde064e AC |
6439 | |
6440 | elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then | |
6441 | return True; | |
6442 | ||
6443 | elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then | |
6444 | return True; | |
6445 | ||
0a36105d JM |
6446 | else |
6447 | return False; | |
6448 | end if; | |
6449 | end Base_Types_Match; | |
aa720a54 | 6450 | |
5d37ba92 ES |
6451 | -------------------------- |
6452 | -- Find_Designated_Type -- | |
6453 | -------------------------- | |
6454 | ||
6455 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
6456 | Desig : Entity_Id; | |
6457 | ||
6458 | begin | |
6459 | Desig := Directly_Designated_Type (T); | |
6460 | ||
6461 | if Ekind (Desig) = E_Incomplete_Type then | |
6462 | ||
6463 | -- If regular incomplete type, get full view if available | |
6464 | ||
6465 | if Present (Full_View (Desig)) then | |
6466 | Desig := Full_View (Desig); | |
6467 | ||
6468 | -- If limited view of a type, get non-limited view if available, | |
6469 | -- and check again for a regular incomplete type. | |
6470 | ||
6471 | elsif Present (Non_Limited_View (Desig)) then | |
6472 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
6473 | end if; | |
6474 | end if; | |
6475 | ||
6476 | return Desig; | |
6477 | end Find_Designated_Type; | |
6478 | ||
0a36105d JM |
6479 | ------------------------------- |
6480 | -- Matches_Limited_With_View -- | |
6481 | ------------------------------- | |
6482 | ||
6483 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
6484 | begin | |
6485 | -- In some cases a type imported through a limited_with clause, and | |
6486 | -- its nonlimited view are both visible, for example in an anonymous | |
28fa5430 AC |
6487 | -- access-to-class-wide type in a formal, or when building the body |
6488 | -- for a subprogram renaming after the subprogram has been frozen. | |
6489 | -- In these cases Both entities designate the same type. In addition, | |
6490 | -- if one of them is an actual in an instance, it may be a subtype of | |
6491 | -- the non-limited view of the other. | |
6492 | ||
6493 | if From_Limited_With (T1) | |
6494 | and then (T2 = Available_View (T1) | |
6495 | or else Is_Subtype_Of (T2, Available_View (T1))) | |
6496 | then | |
aa720a54 AC |
6497 | return True; |
6498 | ||
28fa5430 AC |
6499 | elsif From_Limited_With (T2) |
6500 | and then (T1 = Available_View (T2) | |
6501 | or else Is_Subtype_Of (T1, Available_View (T2))) | |
6502 | then | |
41251c60 | 6503 | return True; |
3e24afaa | 6504 | |
7b56a91b AC |
6505 | elsif From_Limited_With (T1) |
6506 | and then From_Limited_With (T2) | |
3e24afaa AC |
6507 | and then Available_View (T1) = Available_View (T2) |
6508 | then | |
6509 | return True; | |
41251c60 | 6510 | |
996ae0b0 RK |
6511 | else |
6512 | return False; | |
6513 | end if; | |
0a36105d | 6514 | end Matches_Limited_With_View; |
996ae0b0 | 6515 | |
ec4867fa | 6516 | -- Start of processing for Conforming_Types |
758c442c | 6517 | |
996ae0b0 | 6518 | begin |
8fde064e AC |
6519 | -- The context is an instance association for a formal access-to- |
6520 | -- subprogram type; the formal parameter types require mapping because | |
6521 | -- they may denote other formal parameters of the generic unit. | |
996ae0b0 RK |
6522 | |
6523 | if Get_Inst then | |
6524 | Type_1 := Get_Instance_Of (T1); | |
6525 | Type_2 := Get_Instance_Of (T2); | |
6526 | end if; | |
6527 | ||
0a36105d JM |
6528 | -- If one of the types is a view of the other introduced by a limited |
6529 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 6530 | |
0a36105d JM |
6531 | if Matches_Limited_With_View (T1, T2) then |
6532 | return True; | |
6533 | ||
6534 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
6535 | return Ctype <= Mode_Conformant |
6536 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
6537 | ||
6538 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
6539 | and then Present (Full_View (Type_1)) | |
6540 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
6541 | then | |
6542 | return Ctype <= Mode_Conformant | |
6543 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
6544 | ||
6545 | elsif Ekind (Type_2) = E_Incomplete_Type | |
6546 | and then Present (Full_View (Type_2)) | |
6547 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6548 | then | |
6549 | return Ctype <= Mode_Conformant | |
6550 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
6551 | |
6552 | elsif Is_Private_Type (Type_2) | |
6553 | and then In_Instance | |
6554 | and then Present (Full_View (Type_2)) | |
6555 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6556 | then | |
6557 | return Ctype <= Mode_Conformant | |
6558 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
167b47d9 | 6559 | |
088c7e1b | 6560 | -- In Ada 2012, incomplete types (including limited views) can appear |
167b47d9 AC |
6561 | -- as actuals in instantiations. |
6562 | ||
6563 | elsif Is_Incomplete_Type (Type_1) | |
6564 | and then Is_Incomplete_Type (Type_2) | |
6565 | and then (Used_As_Generic_Actual (Type_1) | |
6566 | or else Used_As_Generic_Actual (Type_2)) | |
6567 | then | |
6568 | return True; | |
996ae0b0 RK |
6569 | end if; |
6570 | ||
0a36105d | 6571 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
466c2127 AC |
6572 | -- treated recursively because they carry a signature. As far as |
6573 | -- conformance is concerned, convention plays no role, and either | |
6574 | -- or both could be access to protected subprograms. | |
af4b9434 AC |
6575 | |
6576 | Are_Anonymous_Access_To_Subprogram_Types := | |
466c2127 AC |
6577 | Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
6578 | E_Anonymous_Access_Protected_Subprogram_Type) | |
f937473f | 6579 | and then |
466c2127 AC |
6580 | Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
6581 | E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 6582 | |
996ae0b0 | 6583 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
6584 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
6585 | -- the base types because we may have built internal subtype entities | |
6586 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 6587 | |
5d37ba92 ES |
6588 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
6589 | and then | |
6590 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
8fde064e AC |
6591 | |
6592 | -- Ada 2005 (AI-254) | |
6593 | ||
6594 | or else Are_Anonymous_Access_To_Subprogram_Types | |
996ae0b0 RK |
6595 | then |
6596 | declare | |
6597 | Desig_1 : Entity_Id; | |
6598 | Desig_2 : Entity_Id; | |
6599 | ||
6600 | begin | |
885c4871 | 6601 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 6602 | -- subtype conformance. |
9dcb52e1 | 6603 | |
0791fbe9 | 6604 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
6605 | and then Ctype >= Subtype_Conformant |
6606 | and then | |
6607 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
6608 | then | |
6609 | return False; | |
996ae0b0 RK |
6610 | end if; |
6611 | ||
5d37ba92 | 6612 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 6613 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 6614 | |
5d37ba92 | 6615 | -- If the context is an instance association for a formal |
82c80734 RD |
6616 | -- access-to-subprogram type; formal access parameter designated |
6617 | -- types require mapping because they may denote other formal | |
6618 | -- parameters of the generic unit. | |
996ae0b0 RK |
6619 | |
6620 | if Get_Inst then | |
6621 | Desig_1 := Get_Instance_Of (Desig_1); | |
6622 | Desig_2 := Get_Instance_Of (Desig_2); | |
6623 | end if; | |
6624 | ||
82c80734 RD |
6625 | -- It is possible for a Class_Wide_Type to be introduced for an |
6626 | -- incomplete type, in which case there is a separate class_ wide | |
6627 | -- type for the full view. The types conform if their Etypes | |
6628 | -- conform, i.e. one may be the full view of the other. This can | |
6629 | -- only happen in the context of an access parameter, other uses | |
6630 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 6631 | |
fbf5a39b | 6632 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
6633 | and then |
6634 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
6635 | then |
6636 | return | |
fbf5a39b AC |
6637 | Conforming_Types |
6638 | (Etype (Base_Type (Desig_1)), | |
6639 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
6640 | |
6641 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 6642 | if Ada_Version < Ada_2005 then |
758c442c GD |
6643 | return Ctype = Type_Conformant |
6644 | or else | |
af4b9434 AC |
6645 | Subtypes_Statically_Match (Desig_1, Desig_2); |
6646 | ||
758c442c GD |
6647 | -- We must check the conformance of the signatures themselves |
6648 | ||
6649 | else | |
6650 | declare | |
6651 | Conformant : Boolean; | |
6652 | begin | |
6653 | Check_Conformance | |
6654 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
6655 | return Conformant; | |
6656 | end; | |
6657 | end if; | |
6658 | ||
167b47d9 AC |
6659 | -- A limited view of an actual matches the corresponding |
6660 | -- incomplete formal. | |
6661 | ||
6662 | elsif Ekind (Desig_2) = E_Incomplete_Subtype | |
6663 | and then From_Limited_With (Desig_2) | |
6664 | and then Used_As_Generic_Actual (Etype (Desig_2)) | |
6665 | then | |
6666 | return True; | |
6667 | ||
996ae0b0 RK |
6668 | else |
6669 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
6670 | and then (Ctype = Type_Conformant | |
8fde064e AC |
6671 | or else |
6672 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
6673 | end if; |
6674 | end; | |
6675 | ||
6676 | -- Otherwise definitely no match | |
6677 | ||
6678 | else | |
c8ef728f ES |
6679 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
6680 | and then Is_Access_Type (Type_2)) | |
6681 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
8fde064e | 6682 | and then Is_Access_Type (Type_1))) |
c8ef728f ES |
6683 | and then |
6684 | Conforming_Types | |
6685 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
6686 | then | |
6687 | May_Hide_Profile := True; | |
6688 | end if; | |
6689 | ||
996ae0b0 RK |
6690 | return False; |
6691 | end if; | |
996ae0b0 RK |
6692 | end Conforming_Types; |
6693 | ||
6694 | -------------------------- | |
6695 | -- Create_Extra_Formals -- | |
6696 | -------------------------- | |
6697 | ||
6698 | procedure Create_Extra_Formals (E : Entity_Id) is | |
6699 | Formal : Entity_Id; | |
ec4867fa | 6700 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
6701 | Last_Extra : Entity_Id; |
6702 | Formal_Type : Entity_Id; | |
6703 | P_Formal : Entity_Id := Empty; | |
6704 | ||
ec4867fa ES |
6705 | function Add_Extra_Formal |
6706 | (Assoc_Entity : Entity_Id; | |
6707 | Typ : Entity_Id; | |
6708 | Scope : Entity_Id; | |
6709 | Suffix : String) return Entity_Id; | |
6710 | -- Add an extra formal to the current list of formals and extra formals. | |
6711 | -- The extra formal is added to the end of the list of extra formals, | |
6712 | -- and also returned as the result. These formals are always of mode IN. | |
6713 | -- The new formal has the type Typ, is declared in Scope, and its name | |
6714 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
6715 | -- The following suffixes are currently used. They should not be changed |
6716 | -- without coordinating with CodePeer, which makes use of these to | |
6717 | -- provide better messages. | |
6718 | ||
d92eccc3 AC |
6719 | -- O denotes the Constrained bit. |
6720 | -- L denotes the accessibility level. | |
cd5a9750 AC |
6721 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
6722 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 6723 | |
fbf5a39b AC |
6724 | ---------------------- |
6725 | -- Add_Extra_Formal -- | |
6726 | ---------------------- | |
6727 | ||
ec4867fa ES |
6728 | function Add_Extra_Formal |
6729 | (Assoc_Entity : Entity_Id; | |
6730 | Typ : Entity_Id; | |
6731 | Scope : Entity_Id; | |
6732 | Suffix : String) return Entity_Id | |
6733 | is | |
996ae0b0 | 6734 | EF : constant Entity_Id := |
ec4867fa ES |
6735 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
6736 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 6737 | Suffix => Suffix)); |
996ae0b0 RK |
6738 | |
6739 | begin | |
82c80734 RD |
6740 | -- A little optimization. Never generate an extra formal for the |
6741 | -- _init operand of an initialization procedure, since it could | |
6742 | -- never be used. | |
996ae0b0 RK |
6743 | |
6744 | if Chars (Formal) = Name_uInit then | |
6745 | return Empty; | |
6746 | end if; | |
6747 | ||
6748 | Set_Ekind (EF, E_In_Parameter); | |
6749 | Set_Actual_Subtype (EF, Typ); | |
6750 | Set_Etype (EF, Typ); | |
ec4867fa | 6751 | Set_Scope (EF, Scope); |
996ae0b0 RK |
6752 | Set_Mechanism (EF, Default_Mechanism); |
6753 | Set_Formal_Validity (EF); | |
6754 | ||
ec4867fa ES |
6755 | if No (First_Extra) then |
6756 | First_Extra := EF; | |
6757 | Set_Extra_Formals (Scope, First_Extra); | |
6758 | end if; | |
6759 | ||
6760 | if Present (Last_Extra) then | |
6761 | Set_Extra_Formal (Last_Extra, EF); | |
6762 | end if; | |
6763 | ||
996ae0b0 | 6764 | Last_Extra := EF; |
ec4867fa | 6765 | |
996ae0b0 RK |
6766 | return EF; |
6767 | end Add_Extra_Formal; | |
6768 | ||
6769 | -- Start of processing for Create_Extra_Formals | |
6770 | ||
6771 | begin | |
8fde064e AC |
6772 | -- We never generate extra formals if expansion is not active because we |
6773 | -- don't need them unless we are generating code. | |
f937473f RD |
6774 | |
6775 | if not Expander_Active then | |
6776 | return; | |
6777 | end if; | |
6778 | ||
e2441021 AC |
6779 | -- No need to generate extra formals in interface thunks whose target |
6780 | -- primitive has no extra formals. | |
6781 | ||
6782 | if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then | |
6783 | return; | |
6784 | end if; | |
6785 | ||
82c80734 | 6786 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 6787 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 6788 | -- for extra formals. |
996ae0b0 RK |
6789 | |
6790 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
6791 | P_Formal := First_Formal (Alias (E)); | |
6792 | end if; | |
6793 | ||
6794 | Last_Extra := Empty; | |
6795 | Formal := First_Formal (E); | |
6796 | while Present (Formal) loop | |
6797 | Last_Extra := Formal; | |
6798 | Next_Formal (Formal); | |
6799 | end loop; | |
6800 | ||
03a72cd3 | 6801 | -- If Extra_Formals were already created, don't do it again. This |
82c80734 RD |
6802 | -- situation may arise for subprogram types created as part of |
6803 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 | 6804 | |
8fde064e | 6805 | if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
996ae0b0 RK |
6806 | return; |
6807 | end if; | |
6808 | ||
19590d70 GD |
6809 | -- If the subprogram is a predefined dispatching subprogram then don't |
6810 | -- generate any extra constrained or accessibility level formals. In | |
6811 | -- general we suppress these for internal subprograms (by not calling | |
6812 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
6813 | -- generated stream attributes do get passed through because extra | |
6814 | -- build-in-place formals are needed in some cases (limited 'Input). | |
6815 | ||
bac7206d | 6816 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 6817 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
6818 | end if; |
6819 | ||
996ae0b0 | 6820 | Formal := First_Formal (E); |
996ae0b0 RK |
6821 | while Present (Formal) loop |
6822 | ||
6823 | -- Create extra formal for supporting the attribute 'Constrained. | |
6824 | -- The case of a private type view without discriminants also | |
6825 | -- requires the extra formal if the underlying type has defaulted | |
6826 | -- discriminants. | |
6827 | ||
6828 | if Ekind (Formal) /= E_In_Parameter then | |
6829 | if Present (P_Formal) then | |
6830 | Formal_Type := Etype (P_Formal); | |
6831 | else | |
6832 | Formal_Type := Etype (Formal); | |
6833 | end if; | |
6834 | ||
5d09245e AC |
6835 | -- Do not produce extra formals for Unchecked_Union parameters. |
6836 | -- Jump directly to the end of the loop. | |
6837 | ||
6838 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
6839 | goto Skip_Extra_Formal_Generation; | |
6840 | end if; | |
6841 | ||
996ae0b0 RK |
6842 | if not Has_Discriminants (Formal_Type) |
6843 | and then Ekind (Formal_Type) in Private_Kind | |
6844 | and then Present (Underlying_Type (Formal_Type)) | |
6845 | then | |
6846 | Formal_Type := Underlying_Type (Formal_Type); | |
6847 | end if; | |
6848 | ||
5e5db3b4 GD |
6849 | -- Suppress the extra formal if formal's subtype is constrained or |
6850 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
6851 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
6852 | -- can have defaulted discriminants, but 'Constrained is required | |
6853 | -- to return True, so the formal is never needed (see AI05-0214). | |
6854 | -- Note that this ensures consistency of calling sequences for | |
6855 | -- dispatching operations when some types in a class have defaults | |
6856 | -- on discriminants and others do not (and requiring the extra | |
6857 | -- formal would introduce distributed overhead). | |
6858 | ||
b5bdffcc AC |
6859 | -- If the type does not have a completion yet, treat as prior to |
6860 | -- Ada 2012 for consistency. | |
6861 | ||
996ae0b0 | 6862 | if Has_Discriminants (Formal_Type) |
f937473f | 6863 | and then not Is_Constrained (Formal_Type) |
83496138 | 6864 | and then Is_Definite_Subtype (Formal_Type) |
5e5db3b4 | 6865 | and then (Ada_Version < Ada_2012 |
b5bdffcc AC |
6866 | or else No (Underlying_Type (Formal_Type)) |
6867 | or else not | |
6868 | (Is_Limited_Type (Formal_Type) | |
6869 | and then | |
6870 | (Is_Tagged_Type | |
6871 | (Underlying_Type (Formal_Type))))) | |
996ae0b0 RK |
6872 | then |
6873 | Set_Extra_Constrained | |
d92eccc3 | 6874 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
6875 | end if; |
6876 | end if; | |
6877 | ||
0a36105d JM |
6878 | -- Create extra formal for supporting accessibility checking. This |
6879 | -- is done for both anonymous access formals and formals of named | |
6880 | -- access types that are marked as controlling formals. The latter | |
6881 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
6882 | -- type and substitutes the types of access-to-class-wide actuals | |
6883 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
6884 | -- Base_Type is applied because in cases where there is a null |
6885 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
6886 | |
6887 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 6888 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
6889 | -- package in which it resides. However, we do not suppress it |
6890 | -- simply if the scope has accessibility checks suppressed, since | |
6891 | -- this could cause trouble when clients are compiled with a | |
6892 | -- different suppression setting. The explicit checks at the | |
6893 | -- package level are safe from this point of view. | |
996ae0b0 | 6894 | |
5d37ba92 | 6895 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 6896 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 6897 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 6898 | and then not |
fbf5a39b | 6899 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 6900 | or else |
fbf5a39b | 6901 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 6902 | and then |
c8ef728f | 6903 | (No (P_Formal) |
996ae0b0 RK |
6904 | or else Present (Extra_Accessibility (P_Formal))) |
6905 | then | |
811c6a85 | 6906 | Set_Extra_Accessibility |
d92eccc3 | 6907 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
6908 | end if; |
6909 | ||
5d09245e AC |
6910 | -- This label is required when skipping extra formal generation for |
6911 | -- Unchecked_Union parameters. | |
6912 | ||
6913 | <<Skip_Extra_Formal_Generation>> | |
6914 | ||
f937473f RD |
6915 | if Present (P_Formal) then |
6916 | Next_Formal (P_Formal); | |
6917 | end if; | |
6918 | ||
996ae0b0 RK |
6919 | Next_Formal (Formal); |
6920 | end loop; | |
ec4867fa | 6921 | |
63585f75 SB |
6922 | <<Test_For_Func_Result_Extras>> |
6923 | ||
6924 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
6925 | -- function call is ... determined by the point of call ...". | |
6926 | ||
6927 | if Needs_Result_Accessibility_Level (E) then | |
6928 | Set_Extra_Accessibility_Of_Result | |
6929 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
6930 | end if; | |
19590d70 | 6931 | |
ec4867fa | 6932 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
6933 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
6934 | ||
0791fbe9 | 6935 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 6936 | declare |
f937473f | 6937 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 6938 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 6939 | Formal_Typ : Entity_Id; |
f937473f | 6940 | |
2fcc44fa | 6941 | Discard : Entity_Id; |
f937473f | 6942 | pragma Warnings (Off, Discard); |
ec4867fa ES |
6943 | |
6944 | begin | |
f937473f | 6945 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
6946 | -- add a 4-state formal indicating whether the return object is |
6947 | -- allocated by the caller (1), or should be allocated by the | |
6948 | -- callee on the secondary stack (2), in the global heap (3), or | |
6949 | -- in a user-defined storage pool (4). For the moment we just use | |
6950 | -- Natural for the type of this formal. Note that this formal | |
6951 | -- isn't usually needed in the case where the result subtype is | |
6952 | -- constrained, but it is needed when the function has a tagged | |
6953 | -- result, because generally such functions can be called in a | |
6954 | -- dispatching context and such calls must be handled like calls | |
6955 | -- to a class-wide function. | |
0a36105d | 6956 | |
1bb6e262 | 6957 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
6958 | Discard := |
6959 | Add_Extra_Formal | |
6960 | (E, Standard_Natural, | |
6961 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 6962 | |
8417f4b2 | 6963 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 | 6964 | -- use a user-defined pool. This formal is not added on |
535a8637 | 6965 | -- ZFP as those targets do not support pools. |
200b7162 | 6966 | |
535a8637 | 6967 | if RTE_Available (RE_Root_Storage_Pool_Ptr) then |
8417f4b2 AC |
6968 | Discard := |
6969 | Add_Extra_Formal | |
6970 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
6971 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
6972 | end if; | |
f937473f | 6973 | end if; |
ec4867fa | 6974 | |
df3e68b1 | 6975 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 6976 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 6977 | |
ca5af305 | 6978 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
6979 | Discard := |
6980 | Add_Extra_Formal | |
ca5af305 AC |
6981 | (E, RTE (RE_Finalization_Master_Ptr), |
6982 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
6983 | end if; |
6984 | ||
94bbf008 AC |
6985 | -- When the result type contains tasks, add two extra formals: the |
6986 | -- master of the tasks to be created, and the caller's activation | |
6987 | -- chain. | |
f937473f | 6988 | |
1a36a0cd | 6989 | if Has_Task (Full_Subt) then |
f937473f RD |
6990 | Discard := |
6991 | Add_Extra_Formal | |
6992 | (E, RTE (RE_Master_Id), | |
af89615f | 6993 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
6994 | Discard := |
6995 | Add_Extra_Formal | |
6996 | (E, RTE (RE_Activation_Chain_Access), | |
6997 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
6998 | end if; | |
ec4867fa | 6999 | |
f937473f RD |
7000 | -- All build-in-place functions get an extra formal that will be |
7001 | -- passed the address of the return object within the caller. | |
ec4867fa | 7002 | |
1a36a0cd AC |
7003 | Formal_Typ := |
7004 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 7005 | |
1a36a0cd AC |
7006 | Set_Directly_Designated_Type (Formal_Typ, Result_Subt); |
7007 | Set_Etype (Formal_Typ, Formal_Typ); | |
7008 | Set_Depends_On_Private | |
7009 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
7010 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
7011 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 7012 | |
1a36a0cd AC |
7013 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
7014 | -- the designated type comes from the limited view (for back-end | |
7015 | -- purposes). | |
ec4867fa | 7016 | |
7b56a91b AC |
7017 | Set_From_Limited_With |
7018 | (Formal_Typ, From_Limited_With (Result_Subt)); | |
f937473f | 7019 | |
1a36a0cd AC |
7020 | Layout_Type (Formal_Typ); |
7021 | ||
7022 | Discard := | |
7023 | Add_Extra_Formal | |
7024 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
7025 | end; |
7026 | end if; | |
996ae0b0 RK |
7027 | end Create_Extra_Formals; |
7028 | ||
7029 | ----------------------------- | |
7030 | -- Enter_Overloaded_Entity -- | |
7031 | ----------------------------- | |
7032 | ||
7033 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
7034 | E : Entity_Id := Current_Entity_In_Scope (S); | |
7035 | C_E : Entity_Id := Current_Entity (S); | |
7036 | ||
7037 | begin | |
7038 | if Present (E) then | |
7039 | Set_Has_Homonym (E); | |
7040 | Set_Has_Homonym (S); | |
7041 | end if; | |
7042 | ||
7043 | Set_Is_Immediately_Visible (S); | |
7044 | Set_Scope (S, Current_Scope); | |
7045 | ||
7046 | -- Chain new entity if front of homonym in current scope, so that | |
7047 | -- homonyms are contiguous. | |
7048 | ||
8fde064e | 7049 | if Present (E) and then E /= C_E then |
996ae0b0 RK |
7050 | while Homonym (C_E) /= E loop |
7051 | C_E := Homonym (C_E); | |
7052 | end loop; | |
7053 | ||
7054 | Set_Homonym (C_E, S); | |
7055 | ||
7056 | else | |
7057 | E := C_E; | |
7058 | Set_Current_Entity (S); | |
7059 | end if; | |
7060 | ||
7061 | Set_Homonym (S, E); | |
7062 | ||
2352eadb AC |
7063 | if Is_Inherited_Operation (S) then |
7064 | Append_Inherited_Subprogram (S); | |
7065 | else | |
7066 | Append_Entity (S, Current_Scope); | |
7067 | end if; | |
7068 | ||
996ae0b0 RK |
7069 | Set_Public_Status (S); |
7070 | ||
7071 | if Debug_Flag_E then | |
7072 | Write_Str ("New overloaded entity chain: "); | |
7073 | Write_Name (Chars (S)); | |
996ae0b0 | 7074 | |
82c80734 | 7075 | E := S; |
996ae0b0 RK |
7076 | while Present (E) loop |
7077 | Write_Str (" "); Write_Int (Int (E)); | |
7078 | E := Homonym (E); | |
7079 | end loop; | |
7080 | ||
7081 | Write_Eol; | |
7082 | end if; | |
7083 | ||
7084 | -- Generate warning for hiding | |
7085 | ||
7086 | if Warn_On_Hiding | |
7087 | and then Comes_From_Source (S) | |
7088 | and then In_Extended_Main_Source_Unit (S) | |
7089 | then | |
7090 | E := S; | |
7091 | loop | |
7092 | E := Homonym (E); | |
7093 | exit when No (E); | |
7094 | ||
7fc53871 AC |
7095 | -- Warn unless genuine overloading. Do not emit warning on |
7096 | -- hiding predefined operators in Standard (these are either an | |
7097 | -- (artifact of our implicit declarations, or simple noise) but | |
7098 | -- keep warning on a operator defined on a local subtype, because | |
7099 | -- of the real danger that different operators may be applied in | |
7100 | -- various parts of the program. | |
996ae0b0 | 7101 | |
1f250383 AC |
7102 | -- Note that if E and S have the same scope, there is never any |
7103 | -- hiding. Either the two conflict, and the program is illegal, | |
7104 | -- or S is overriding an implicit inherited subprogram. | |
7105 | ||
7106 | if Scope (E) /= Scope (S) | |
7107 | and then (not Is_Overloadable (E) | |
8d606a78 | 7108 | or else Subtype_Conformant (E, S)) |
f937473f RD |
7109 | and then (Is_Immediately_Visible (E) |
7110 | or else | |
7111 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 7112 | then |
7fc53871 AC |
7113 | if Scope (E) /= Standard_Standard then |
7114 | Error_Msg_Sloc := Sloc (E); | |
3ccedacc | 7115 | Error_Msg_N ("declaration of & hides one #?h?", S); |
7fc53871 AC |
7116 | |
7117 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
7118 | and then | |
1f250383 | 7119 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
7120 | then |
7121 | Error_Msg_N | |
dbfeb4fa | 7122 | ("declaration of & hides predefined operator?h?", S); |
7fc53871 | 7123 | end if; |
996ae0b0 RK |
7124 | end if; |
7125 | end loop; | |
7126 | end if; | |
7127 | end Enter_Overloaded_Entity; | |
7128 | ||
e5a58fac AC |
7129 | ----------------------------- |
7130 | -- Check_Untagged_Equality -- | |
7131 | ----------------------------- | |
7132 | ||
7133 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
7134 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
7135 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
7136 | Obj_Decl : Node_Id; | |
7137 | ||
7138 | begin | |
7c0c194b AC |
7139 | -- This check applies only if we have a subprogram declaration with an |
7140 | -- untagged record type. | |
b2834fbd AC |
7141 | |
7142 | if Nkind (Decl) /= N_Subprogram_Declaration | |
7143 | or else not Is_Record_Type (Typ) | |
7144 | or else Is_Tagged_Type (Typ) | |
e5a58fac | 7145 | then |
b2834fbd AC |
7146 | return; |
7147 | end if; | |
e5a58fac | 7148 | |
b2834fbd AC |
7149 | -- In Ada 2012 case, we will output errors or warnings depending on |
7150 | -- the setting of debug flag -gnatd.E. | |
7151 | ||
7152 | if Ada_Version >= Ada_2012 then | |
7153 | Error_Msg_Warn := Debug_Flag_Dot_EE; | |
7154 | ||
7155 | -- In earlier versions of Ada, nothing to do unless we are warning on | |
7156 | -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). | |
7157 | ||
7158 | else | |
7159 | if not Warn_On_Ada_2012_Compatibility then | |
7160 | return; | |
7161 | end if; | |
7162 | end if; | |
7163 | ||
7164 | -- Cases where the type has already been frozen | |
e5a58fac | 7165 | |
b2834fbd AC |
7166 | if Is_Frozen (Typ) then |
7167 | ||
7168 | -- If the type is not declared in a package, or if we are in the body | |
7169 | -- of the package or in some other scope, the new operation is not | |
7170 | -- primitive, and therefore legal, though suspicious. Should we | |
7171 | -- generate a warning in this case ??? | |
7172 | ||
7173 | if Ekind (Scope (Typ)) /= E_Package | |
7174 | or else Scope (Typ) /= Current_Scope | |
7175 | then | |
7176 | return; | |
7177 | ||
7178 | -- If the type is a generic actual (sub)type, the operation is not | |
7179 | -- primitive either because the base type is declared elsewhere. | |
7180 | ||
7181 | elsif Is_Generic_Actual_Type (Typ) then | |
7182 | return; | |
7183 | ||
7184 | -- Here we have a definite error of declaration after freezing | |
7185 | ||
7186 | else | |
7187 | if Ada_Version >= Ada_2012 then | |
ae6ede77 | 7188 | Error_Msg_NE |
3ccedacc | 7189 | ("equality operator must be declared before type & is " |
b2834fbd AC |
7190 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); |
7191 | ||
7192 | -- In Ada 2012 mode with error turned to warning, output one | |
7193 | -- more warning to warn that the equality operation may not | |
7194 | -- compose. This is the consequence of ignoring the error. | |
7195 | ||
7196 | if Error_Msg_Warn then | |
7197 | Error_Msg_N ("\equality operation may not compose??", Eq_Op); | |
7198 | end if; | |
21a5b575 AC |
7199 | |
7200 | else | |
7201 | Error_Msg_NE | |
b2834fbd AC |
7202 | ("equality operator must be declared before type& is " |
7203 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); | |
7204 | end if; | |
7205 | ||
7206 | -- If we are in the package body, we could just move the | |
7207 | -- declaration to the package spec, so add a message saying that. | |
7208 | ||
7209 | if In_Package_Body (Scope (Typ)) then | |
7210 | if Ada_Version >= Ada_2012 then | |
7211 | Error_Msg_N | |
7212 | ("\move declaration to package spec<<", Eq_Op); | |
7213 | else | |
7214 | Error_Msg_N | |
7215 | ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); | |
7216 | end if; | |
21a5b575 | 7217 | |
b2834fbd AC |
7218 | -- Otherwise try to find the freezing point |
7219 | ||
7220 | else | |
21a5b575 | 7221 | Obj_Decl := Next (Parent (Typ)); |
dbfeb4fa | 7222 | while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
21a5b575 AC |
7223 | if Nkind (Obj_Decl) = N_Object_Declaration |
7224 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
7225 | then | |
b2834fbd AC |
7226 | -- Freezing point, output warnings |
7227 | ||
7228 | if Ada_Version >= Ada_2012 then | |
7229 | Error_Msg_NE | |
7230 | ("type& is frozen by declaration??", Obj_Decl, Typ); | |
7231 | Error_Msg_N | |
7232 | ("\an equality operator cannot be declared after " | |
7233 | & "this point??", | |
7234 | Obj_Decl); | |
7235 | else | |
7236 | Error_Msg_NE | |
7237 | ("type& is frozen by declaration (Ada 2012)?y?", | |
7238 | Obj_Decl, Typ); | |
7239 | Error_Msg_N | |
7240 | ("\an equality operator cannot be declared after " | |
7241 | & "this point (Ada 2012)?y?", | |
7242 | Obj_Decl); | |
7243 | end if; | |
7244 | ||
21a5b575 AC |
7245 | exit; |
7246 | end if; | |
7247 | ||
7248 | Next (Obj_Decl); | |
7249 | end loop; | |
7250 | end if; | |
b2834fbd | 7251 | end if; |
e5a58fac | 7252 | |
b2834fbd AC |
7253 | -- Here if type is not frozen yet. It is illegal to have a primitive |
7254 | -- equality declared in the private part if the type is visible. | |
21a5b575 | 7255 | |
b2834fbd AC |
7256 | elsif not In_Same_List (Parent (Typ), Decl) |
7257 | and then not Is_Limited_Type (Typ) | |
7258 | then | |
7259 | -- Shouldn't we give an RM reference here??? | |
21a5b575 | 7260 | |
b2834fbd AC |
7261 | if Ada_Version >= Ada_2012 then |
7262 | Error_Msg_N | |
7263 | ("equality operator appears too late<<", Eq_Op); | |
7264 | else | |
7265 | Error_Msg_N | |
7266 | ("equality operator appears too late (Ada 2012)?y?", Eq_Op); | |
e5a58fac | 7267 | end if; |
b2834fbd AC |
7268 | |
7269 | -- No error detected | |
7270 | ||
7271 | else | |
7272 | return; | |
e5a58fac AC |
7273 | end if; |
7274 | end Check_Untagged_Equality; | |
7275 | ||
996ae0b0 RK |
7276 | ----------------------------- |
7277 | -- Find_Corresponding_Spec -- | |
7278 | ----------------------------- | |
7279 | ||
d44202ba HK |
7280 | function Find_Corresponding_Spec |
7281 | (N : Node_Id; | |
7282 | Post_Error : Boolean := True) return Entity_Id | |
7283 | is | |
996ae0b0 RK |
7284 | Spec : constant Node_Id := Specification (N); |
7285 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
7286 | ||
7287 | E : Entity_Id; | |
7288 | ||
70f4ad20 AC |
7289 | function Different_Generic_Profile (E : Entity_Id) return Boolean; |
7290 | -- Even if fully conformant, a body may depend on a generic actual when | |
7291 | -- the spec does not, or vice versa, in which case they were distinct | |
7292 | -- entities in the generic. | |
7293 | ||
7294 | ------------------------------- | |
7295 | -- Different_Generic_Profile -- | |
7296 | ------------------------------- | |
7297 | ||
7298 | function Different_Generic_Profile (E : Entity_Id) return Boolean is | |
7299 | F1, F2 : Entity_Id; | |
7300 | ||
2995860f AC |
7301 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
7302 | -- Check that the types of corresponding formals have the same | |
7303 | -- generic actual if any. We have to account for subtypes of a | |
7304 | -- generic formal, declared between a spec and a body, which may | |
73999267 AC |
7305 | -- appear distinct in an instance but matched in the generic, and |
7306 | -- the subtype may be used either in the spec or the body of the | |
7307 | -- subprogram being checked. | |
2995860f AC |
7308 | |
7309 | ------------------------- | |
7310 | -- Same_Generic_Actual -- | |
7311 | ------------------------- | |
7312 | ||
7313 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is | |
73999267 AC |
7314 | |
7315 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean; | |
7316 | -- Predicate to check whether S1 is a subtype of S2 in the source | |
7317 | -- of the instance. | |
7318 | ||
7319 | ------------------------- | |
7320 | -- Is_Declared_Subtype -- | |
7321 | ------------------------- | |
7322 | ||
7323 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean is | |
7324 | begin | |
7325 | return Comes_From_Source (Parent (S1)) | |
7326 | and then Nkind (Parent (S1)) = N_Subtype_Declaration | |
7327 | and then Is_Entity_Name (Subtype_Indication (Parent (S1))) | |
7328 | and then Entity (Subtype_Indication (Parent (S1))) = S2; | |
7329 | end Is_Declared_Subtype; | |
7330 | ||
7331 | -- Start of processing for Same_Generic_Actual | |
7332 | ||
2995860f AC |
7333 | begin |
7334 | return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) | |
73999267 AC |
7335 | or else Is_Declared_Subtype (T1, T2) |
7336 | or else Is_Declared_Subtype (T2, T1); | |
2995860f AC |
7337 | end Same_Generic_Actual; |
7338 | ||
7339 | -- Start of processing for Different_Generic_Profile | |
7340 | ||
70f4ad20 | 7341 | begin |
2995860f AC |
7342 | if not In_Instance then |
7343 | return False; | |
7344 | ||
7345 | elsif Ekind (E) = E_Function | |
7346 | and then not Same_Generic_Actual (Etype (E), Etype (Designator)) | |
70f4ad20 AC |
7347 | then |
7348 | return True; | |
7349 | end if; | |
7350 | ||
7351 | F1 := First_Formal (Designator); | |
7352 | F2 := First_Formal (E); | |
70f4ad20 | 7353 | while Present (F1) loop |
2995860f | 7354 | if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
70f4ad20 AC |
7355 | return True; |
7356 | end if; | |
7357 | ||
7358 | Next_Formal (F1); | |
7359 | Next_Formal (F2); | |
7360 | end loop; | |
7361 | ||
7362 | return False; | |
7363 | end Different_Generic_Profile; | |
7364 | ||
7365 | -- Start of processing for Find_Corresponding_Spec | |
7366 | ||
996ae0b0 RK |
7367 | begin |
7368 | E := Current_Entity (Designator); | |
996ae0b0 RK |
7369 | while Present (E) loop |
7370 | ||
7371 | -- We are looking for a matching spec. It must have the same scope, | |
7372 | -- and the same name, and either be type conformant, or be the case | |
7373 | -- of a library procedure spec and its body (which belong to one | |
7374 | -- another regardless of whether they are type conformant or not). | |
7375 | ||
7376 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
7377 | if Current_Scope = Standard_Standard |
7378 | or else (Ekind (E) = Ekind (Designator) | |
586ecbf3 | 7379 | and then Type_Conformant (E, Designator)) |
996ae0b0 RK |
7380 | then |
7381 | -- Within an instantiation, we know that spec and body are | |
70f4ad20 AC |
7382 | -- subtype conformant, because they were subtype conformant in |
7383 | -- the generic. We choose the subtype-conformant entity here as | |
7384 | -- well, to resolve spurious ambiguities in the instance that | |
7385 | -- were not present in the generic (i.e. when two different | |
7386 | -- types are given the same actual). If we are looking for a | |
7387 | -- spec to match a body, full conformance is expected. | |
996ae0b0 RK |
7388 | |
7389 | if In_Instance then | |
c05ba1f1 AC |
7390 | |
7391 | -- Inherit the convention and "ghostness" of the matching | |
7392 | -- spec to ensure proper full and subtype conformance. | |
7393 | ||
996ae0b0 RK |
7394 | Set_Convention (Designator, Convention (E)); |
7395 | ||
c05ba1f1 AC |
7396 | if Is_Ghost_Entity (E) then |
7397 | Set_Is_Ghost_Entity (Designator); | |
7398 | end if; | |
7399 | ||
0187b60e AC |
7400 | -- Skip past subprogram bodies and subprogram renamings that |
7401 | -- may appear to have a matching spec, but that aren't fully | |
7402 | -- conformant with it. That can occur in cases where an | |
7403 | -- actual type causes unrelated homographs in the instance. | |
7404 | ||
7405 | if Nkind_In (N, N_Subprogram_Body, | |
7406 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 7407 | and then Present (Homonym (E)) |
c7b9d548 | 7408 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
7409 | then |
7410 | goto Next_Entity; | |
7411 | ||
c7b9d548 | 7412 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 | 7413 | goto Next_Entity; |
70f4ad20 AC |
7414 | |
7415 | elsif Different_Generic_Profile (E) then | |
7416 | goto Next_Entity; | |
996ae0b0 RK |
7417 | end if; |
7418 | end if; | |
7419 | ||
25ebc085 AC |
7420 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
7421 | -- null procedures locate the internally generated spec. We | |
7422 | -- enforce mode conformance since a tagged type may inherit | |
7423 | -- from interfaces several null primitives which differ only | |
7424 | -- in the mode of the formals. | |
7425 | ||
7426 | if not (Comes_From_Source (E)) | |
7427 | and then Is_Null_Procedure (E) | |
7428 | and then not Mode_Conformant (Designator, E) | |
7429 | then | |
7430 | null; | |
7431 | ||
4d8f3296 ES |
7432 | -- For null procedures coming from source that are completions, |
7433 | -- analysis of the generated body will establish the link. | |
7434 | ||
7435 | elsif Comes_From_Source (E) | |
7436 | and then Nkind (Spec) = N_Procedure_Specification | |
7437 | and then Null_Present (Spec) | |
7438 | then | |
7439 | return E; | |
7440 | ||
25ebc085 | 7441 | elsif not Has_Completion (E) then |
996ae0b0 RK |
7442 | if Nkind (N) /= N_Subprogram_Body_Stub then |
7443 | Set_Corresponding_Spec (N, E); | |
7444 | end if; | |
7445 | ||
7446 | Set_Has_Completion (E); | |
7447 | return E; | |
7448 | ||
7449 | elsif Nkind (Parent (N)) = N_Subunit then | |
7450 | ||
7451 | -- If this is the proper body of a subunit, the completion | |
7452 | -- flag is set when analyzing the stub. | |
7453 | ||
7454 | return E; | |
7455 | ||
70f4ad20 AC |
7456 | -- If E is an internal function with a controlling result that |
7457 | -- was created for an operation inherited by a null extension, | |
7458 | -- it may be overridden by a body without a previous spec (one | |
2995860f | 7459 | -- more reason why these should be shunned). In that case we |
70f4ad20 AC |
7460 | -- remove the generated body if present, because the current |
7461 | -- one is the explicit overriding. | |
81db9d77 ES |
7462 | |
7463 | elsif Ekind (E) = E_Function | |
0791fbe9 | 7464 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
7465 | and then not Comes_From_Source (E) |
7466 | and then Has_Controlling_Result (E) | |
7467 | and then Is_Null_Extension (Etype (E)) | |
7468 | and then Comes_From_Source (Spec) | |
7469 | then | |
7470 | Set_Has_Completion (E, False); | |
7471 | ||
1366997b AC |
7472 | if Expander_Active |
7473 | and then Nkind (Parent (E)) = N_Function_Specification | |
7474 | then | |
81db9d77 ES |
7475 | Remove |
7476 | (Unit_Declaration_Node | |
1366997b AC |
7477 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
7478 | ||
81db9d77 ES |
7479 | return E; |
7480 | ||
1366997b AC |
7481 | -- If expansion is disabled, or if the wrapper function has |
7482 | -- not been generated yet, this a late body overriding an | |
7483 | -- inherited operation, or it is an overriding by some other | |
7484 | -- declaration before the controlling result is frozen. In | |
7485 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
7486 | |
7487 | else | |
7488 | return Empty; | |
7489 | end if; | |
7490 | ||
d44202ba HK |
7491 | -- If the body already exists, then this is an error unless |
7492 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
7493 | -- derived subprogram. It is also legal for an instance to |
7494 | -- contain type conformant overloadable declarations (but the | |
7495 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
7496 | |
7497 | elsif No (Alias (E)) | |
7498 | and then not Is_Intrinsic_Subprogram (E) | |
7499 | and then not In_Instance | |
d44202ba | 7500 | and then Post_Error |
996ae0b0 RK |
7501 | then |
7502 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 7503 | |
07fc65c4 GB |
7504 | if Is_Imported (E) then |
7505 | Error_Msg_NE | |
7506 | ("body not allowed for imported subprogram & declared#", | |
7507 | N, E); | |
7508 | else | |
7509 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
7510 | end if; | |
996ae0b0 RK |
7511 | end if; |
7512 | ||
d44202ba HK |
7513 | -- Child units cannot be overloaded, so a conformance mismatch |
7514 | -- between body and a previous spec is an error. | |
7515 | ||
996ae0b0 RK |
7516 | elsif Is_Child_Unit (E) |
7517 | and then | |
7518 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
7519 | and then | |
5d37ba92 | 7520 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
7521 | N_Compilation_Unit |
7522 | and then Post_Error | |
996ae0b0 | 7523 | then |
996ae0b0 RK |
7524 | Error_Msg_N |
7525 | ("body of child unit does not match previous declaration", N); | |
7526 | end if; | |
7527 | end if; | |
7528 | ||
7529 | <<Next_Entity>> | |
7530 | E := Homonym (E); | |
7531 | end loop; | |
7532 | ||
7533 | -- On exit, we know that no previous declaration of subprogram exists | |
7534 | ||
7535 | return Empty; | |
7536 | end Find_Corresponding_Spec; | |
7537 | ||
7538 | ---------------------- | |
7539 | -- Fully_Conformant -- | |
7540 | ---------------------- | |
7541 | ||
7542 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
7543 | Result : Boolean; | |
996ae0b0 RK |
7544 | begin |
7545 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
7546 | return Result; | |
7547 | end Fully_Conformant; | |
7548 | ||
7549 | ---------------------------------- | |
7550 | -- Fully_Conformant_Expressions -- | |
7551 | ---------------------------------- | |
7552 | ||
7553 | function Fully_Conformant_Expressions | |
7554 | (Given_E1 : Node_Id; | |
d05ef0ab | 7555 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
7556 | is |
7557 | E1 : constant Node_Id := Original_Node (Given_E1); | |
7558 | E2 : constant Node_Id := Original_Node (Given_E2); | |
7559 | -- We always test conformance on original nodes, since it is possible | |
7560 | -- for analysis and/or expansion to make things look as though they | |
7561 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
7562 | ||
7563 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
7564 | renames Fully_Conformant_Expressions; | |
7565 | ||
7566 | function FCL (L1, L2 : List_Id) return Boolean; | |
70f4ad20 AC |
7567 | -- Compare elements of two lists for conformance. Elements have to be |
7568 | -- conformant, and actuals inserted as default parameters do not match | |
7569 | -- explicit actuals with the same value. | |
996ae0b0 RK |
7570 | |
7571 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 7572 | -- Compare an operator node with a function call |
996ae0b0 RK |
7573 | |
7574 | --------- | |
7575 | -- FCL -- | |
7576 | --------- | |
7577 | ||
7578 | function FCL (L1, L2 : List_Id) return Boolean is | |
7579 | N1, N2 : Node_Id; | |
7580 | ||
7581 | begin | |
7582 | if L1 = No_List then | |
7583 | N1 := Empty; | |
7584 | else | |
7585 | N1 := First (L1); | |
7586 | end if; | |
7587 | ||
7588 | if L2 = No_List then | |
7589 | N2 := Empty; | |
7590 | else | |
7591 | N2 := First (L2); | |
7592 | end if; | |
7593 | ||
70f4ad20 | 7594 | -- Compare two lists, skipping rewrite insertions (we want to compare |
a90bd866 | 7595 | -- the original trees, not the expanded versions). |
996ae0b0 RK |
7596 | |
7597 | loop | |
7598 | if Is_Rewrite_Insertion (N1) then | |
7599 | Next (N1); | |
7600 | elsif Is_Rewrite_Insertion (N2) then | |
7601 | Next (N2); | |
7602 | elsif No (N1) then | |
7603 | return No (N2); | |
7604 | elsif No (N2) then | |
7605 | return False; | |
7606 | elsif not FCE (N1, N2) then | |
7607 | return False; | |
7608 | else | |
7609 | Next (N1); | |
7610 | Next (N2); | |
7611 | end if; | |
7612 | end loop; | |
7613 | end FCL; | |
7614 | ||
7615 | --------- | |
7616 | -- FCO -- | |
7617 | --------- | |
7618 | ||
7619 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
7620 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
7621 | Act : Node_Id; | |
7622 | ||
7623 | begin | |
7624 | if No (Actuals) | |
7625 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
7626 | then | |
7627 | return False; | |
7628 | ||
7629 | else | |
7630 | Act := First (Actuals); | |
7631 | ||
7632 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
7633 | if not FCE (Left_Opnd (Op_Node), Act) then |
7634 | return False; | |
7635 | end if; | |
7636 | ||
7637 | Next (Act); | |
7638 | end if; | |
7639 | ||
7640 | return Present (Act) | |
7641 | and then FCE (Right_Opnd (Op_Node), Act) | |
7642 | and then No (Next (Act)); | |
7643 | end if; | |
7644 | end FCO; | |
7645 | ||
7646 | -- Start of processing for Fully_Conformant_Expressions | |
7647 | ||
7648 | begin | |
7649 | -- Non-conformant if paren count does not match. Note: if some idiot | |
7650 | -- complains that we don't do this right for more than 3 levels of | |
a90bd866 | 7651 | -- parentheses, they will be treated with the respect they deserve. |
996ae0b0 RK |
7652 | |
7653 | if Paren_Count (E1) /= Paren_Count (E2) then | |
7654 | return False; | |
7655 | ||
82c80734 RD |
7656 | -- If same entities are referenced, then they are conformant even if |
7657 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
7658 | |
7659 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
7660 | if Present (Entity (E1)) then | |
7661 | return Entity (E1) = Entity (E2) | |
7662 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
7663 | and then Ekind (Entity (E1)) = E_Discriminant | |
7664 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
7665 | ||
7666 | elsif Nkind (E1) = N_Expanded_Name | |
7667 | and then Nkind (E2) = N_Expanded_Name | |
7668 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
7669 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
7670 | then | |
7671 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
7672 | ||
7673 | else | |
7674 | -- Identifiers in component associations don't always have | |
7675 | -- entities, but their names must conform. | |
7676 | ||
7677 | return Nkind (E1) = N_Identifier | |
7678 | and then Nkind (E2) = N_Identifier | |
7679 | and then Chars (E1) = Chars (E2); | |
7680 | end if; | |
7681 | ||
7682 | elsif Nkind (E1) = N_Character_Literal | |
7683 | and then Nkind (E2) = N_Expanded_Name | |
7684 | then | |
7685 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
7686 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
7687 | ||
7688 | elsif Nkind (E2) = N_Character_Literal | |
7689 | and then Nkind (E1) = N_Expanded_Name | |
7690 | then | |
7691 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
7692 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
7693 | ||
8fde064e | 7694 | elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
996ae0b0 RK |
7695 | return FCO (E1, E2); |
7696 | ||
8fde064e | 7697 | elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
996ae0b0 RK |
7698 | return FCO (E2, E1); |
7699 | ||
7700 | -- Otherwise we must have the same syntactic entity | |
7701 | ||
7702 | elsif Nkind (E1) /= Nkind (E2) then | |
7703 | return False; | |
7704 | ||
7705 | -- At this point, we specialize by node type | |
7706 | ||
7707 | else | |
7708 | case Nkind (E1) is | |
7709 | ||
7710 | when N_Aggregate => | |
7711 | return | |
7712 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
7713 | and then |
7714 | FCL (Component_Associations (E1), | |
7715 | Component_Associations (E2)); | |
996ae0b0 RK |
7716 | |
7717 | when N_Allocator => | |
7718 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
7719 | or else | |
7720 | Nkind (Expression (E2)) = N_Qualified_Expression | |
7721 | then | |
7722 | return FCE (Expression (E1), Expression (E2)); | |
7723 | ||
7724 | -- Check that the subtype marks and any constraints | |
7725 | -- are conformant | |
7726 | ||
7727 | else | |
7728 | declare | |
7729 | Indic1 : constant Node_Id := Expression (E1); | |
7730 | Indic2 : constant Node_Id := Expression (E2); | |
7731 | Elt1 : Node_Id; | |
7732 | Elt2 : Node_Id; | |
7733 | ||
7734 | begin | |
7735 | if Nkind (Indic1) /= N_Subtype_Indication then | |
7736 | return | |
7737 | Nkind (Indic2) /= N_Subtype_Indication | |
7738 | and then Entity (Indic1) = Entity (Indic2); | |
7739 | ||
7740 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
7741 | return | |
7742 | Nkind (Indic1) /= N_Subtype_Indication | |
7743 | and then Entity (Indic1) = Entity (Indic2); | |
7744 | ||
7745 | else | |
7746 | if Entity (Subtype_Mark (Indic1)) /= | |
7747 | Entity (Subtype_Mark (Indic2)) | |
7748 | then | |
7749 | return False; | |
7750 | end if; | |
7751 | ||
7752 | Elt1 := First (Constraints (Constraint (Indic1))); | |
7753 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
7754 | while Present (Elt1) and then Present (Elt2) loop |
7755 | if not FCE (Elt1, Elt2) then | |
7756 | return False; | |
7757 | end if; | |
7758 | ||
7759 | Next (Elt1); | |
7760 | Next (Elt2); | |
7761 | end loop; | |
7762 | ||
7763 | return True; | |
7764 | end if; | |
7765 | end; | |
7766 | end if; | |
7767 | ||
7768 | when N_Attribute_Reference => | |
7769 | return | |
7770 | Attribute_Name (E1) = Attribute_Name (E2) | |
7771 | and then FCL (Expressions (E1), Expressions (E2)); | |
7772 | ||
7773 | when N_Binary_Op => | |
7774 | return | |
7775 | Entity (E1) = Entity (E2) | |
7776 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7777 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7778 | ||
514d0fc5 | 7779 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
7780 | return |
7781 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7782 | and then | |
7783 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7784 | ||
19d846a0 RD |
7785 | when N_Case_Expression => |
7786 | declare | |
7787 | Alt1 : Node_Id; | |
7788 | Alt2 : Node_Id; | |
7789 | ||
7790 | begin | |
7791 | if not FCE (Expression (E1), Expression (E2)) then | |
7792 | return False; | |
7793 | ||
7794 | else | |
7795 | Alt1 := First (Alternatives (E1)); | |
7796 | Alt2 := First (Alternatives (E2)); | |
7797 | loop | |
7798 | if Present (Alt1) /= Present (Alt2) then | |
7799 | return False; | |
7800 | elsif No (Alt1) then | |
7801 | return True; | |
7802 | end if; | |
7803 | ||
7804 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
7805 | or else not FCL (Discrete_Choices (Alt1), | |
7806 | Discrete_Choices (Alt2)) | |
7807 | then | |
7808 | return False; | |
7809 | end if; | |
7810 | ||
7811 | Next (Alt1); | |
7812 | Next (Alt2); | |
7813 | end loop; | |
7814 | end if; | |
7815 | end; | |
7816 | ||
996ae0b0 RK |
7817 | when N_Character_Literal => |
7818 | return | |
7819 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
7820 | ||
7821 | when N_Component_Association => | |
7822 | return | |
7823 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
7824 | and then |
7825 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 7826 | |
996ae0b0 RK |
7827 | when N_Explicit_Dereference => |
7828 | return | |
7829 | FCE (Prefix (E1), Prefix (E2)); | |
7830 | ||
7831 | when N_Extension_Aggregate => | |
7832 | return | |
7833 | FCL (Expressions (E1), Expressions (E2)) | |
7834 | and then Null_Record_Present (E1) = | |
7835 | Null_Record_Present (E2) | |
7836 | and then FCL (Component_Associations (E1), | |
7837 | Component_Associations (E2)); | |
7838 | ||
7839 | when N_Function_Call => | |
7840 | return | |
7841 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
7842 | and then |
7843 | FCL (Parameter_Associations (E1), | |
7844 | Parameter_Associations (E2)); | |
996ae0b0 | 7845 | |
9b16cb57 RD |
7846 | when N_If_Expression => |
7847 | return | |
7848 | FCL (Expressions (E1), Expressions (E2)); | |
7849 | ||
996ae0b0 RK |
7850 | when N_Indexed_Component => |
7851 | return | |
7852 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7853 | and then |
7854 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
7855 | |
7856 | when N_Integer_Literal => | |
7857 | return (Intval (E1) = Intval (E2)); | |
7858 | ||
7859 | when N_Null => | |
7860 | return True; | |
7861 | ||
7862 | when N_Operator_Symbol => | |
7863 | return | |
7864 | Chars (E1) = Chars (E2); | |
7865 | ||
7866 | when N_Others_Choice => | |
7867 | return True; | |
7868 | ||
7869 | when N_Parameter_Association => | |
7870 | return | |
996ae0b0 RK |
7871 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
7872 | and then FCE (Explicit_Actual_Parameter (E1), | |
7873 | Explicit_Actual_Parameter (E2)); | |
7874 | ||
7875 | when N_Qualified_Expression => | |
7876 | return | |
7877 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7878 | and then |
7879 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 7880 | |
2010d078 AC |
7881 | when N_Quantified_Expression => |
7882 | if not FCE (Condition (E1), Condition (E2)) then | |
7883 | return False; | |
7884 | end if; | |
7885 | ||
7886 | if Present (Loop_Parameter_Specification (E1)) | |
7887 | and then Present (Loop_Parameter_Specification (E2)) | |
7888 | then | |
7889 | declare | |
7890 | L1 : constant Node_Id := | |
7891 | Loop_Parameter_Specification (E1); | |
7892 | L2 : constant Node_Id := | |
7893 | Loop_Parameter_Specification (E2); | |
7894 | ||
7895 | begin | |
7896 | return | |
7897 | Reverse_Present (L1) = Reverse_Present (L2) | |
7898 | and then | |
7899 | FCE (Defining_Identifier (L1), | |
7900 | Defining_Identifier (L2)) | |
7901 | and then | |
7902 | FCE (Discrete_Subtype_Definition (L1), | |
7903 | Discrete_Subtype_Definition (L2)); | |
7904 | end; | |
7905 | ||
804670f1 AC |
7906 | elsif Present (Iterator_Specification (E1)) |
7907 | and then Present (Iterator_Specification (E2)) | |
7908 | then | |
2010d078 AC |
7909 | declare |
7910 | I1 : constant Node_Id := Iterator_Specification (E1); | |
7911 | I2 : constant Node_Id := Iterator_Specification (E2); | |
7912 | ||
7913 | begin | |
7914 | return | |
7915 | FCE (Defining_Identifier (I1), | |
7916 | Defining_Identifier (I2)) | |
7917 | and then | |
7918 | Of_Present (I1) = Of_Present (I2) | |
7919 | and then | |
7920 | Reverse_Present (I1) = Reverse_Present (I2) | |
7921 | and then FCE (Name (I1), Name (I2)) | |
7922 | and then FCE (Subtype_Indication (I1), | |
7923 | Subtype_Indication (I2)); | |
7924 | end; | |
804670f1 AC |
7925 | |
7926 | -- The quantified expressions used different specifications to | |
7927 | -- walk their respective ranges. | |
7928 | ||
7929 | else | |
7930 | return False; | |
2010d078 AC |
7931 | end if; |
7932 | ||
996ae0b0 RK |
7933 | when N_Range => |
7934 | return | |
7935 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
7936 | and then |
7937 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
7938 | |
7939 | when N_Real_Literal => | |
7940 | return (Realval (E1) = Realval (E2)); | |
7941 | ||
7942 | when N_Selected_Component => | |
7943 | return | |
7944 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7945 | and then |
7946 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
7947 | |
7948 | when N_Slice => | |
7949 | return | |
7950 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7951 | and then |
7952 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
7953 | |
7954 | when N_String_Literal => | |
7955 | declare | |
7956 | S1 : constant String_Id := Strval (E1); | |
7957 | S2 : constant String_Id := Strval (E2); | |
7958 | L1 : constant Nat := String_Length (S1); | |
7959 | L2 : constant Nat := String_Length (S2); | |
7960 | ||
7961 | begin | |
7962 | if L1 /= L2 then | |
7963 | return False; | |
7964 | ||
7965 | else | |
7966 | for J in 1 .. L1 loop | |
7967 | if Get_String_Char (S1, J) /= | |
7968 | Get_String_Char (S2, J) | |
7969 | then | |
7970 | return False; | |
7971 | end if; | |
7972 | end loop; | |
7973 | ||
7974 | return True; | |
7975 | end if; | |
7976 | end; | |
7977 | ||
7978 | when N_Type_Conversion => | |
7979 | return | |
7980 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7981 | and then |
7982 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7983 | |
7984 | when N_Unary_Op => | |
7985 | return | |
7986 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
7987 | and then |
7988 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
7989 | |
7990 | when N_Unchecked_Type_Conversion => | |
7991 | return | |
7992 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7993 | and then |
7994 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7995 | |
7996 | -- All other node types cannot appear in this context. Strictly | |
7997 | -- we should raise a fatal internal error. Instead we just ignore | |
7998 | -- the nodes. This means that if anyone makes a mistake in the | |
2995860f AC |
7999 | -- expander and mucks an expression tree irretrievably, the result |
8000 | -- will be a failure to detect a (probably very obscure) case | |
8001 | -- of non-conformance, which is better than bombing on some | |
996ae0b0 RK |
8002 | -- case where two expressions do in fact conform. |
8003 | ||
8004 | when others => | |
8005 | return True; | |
8006 | ||
8007 | end case; | |
8008 | end if; | |
8009 | end Fully_Conformant_Expressions; | |
8010 | ||
fbf5a39b AC |
8011 | ---------------------------------------- |
8012 | -- Fully_Conformant_Discrete_Subtypes -- | |
8013 | ---------------------------------------- | |
8014 | ||
8015 | function Fully_Conformant_Discrete_Subtypes | |
8016 | (Given_S1 : Node_Id; | |
d05ef0ab | 8017 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
8018 | is |
8019 | S1 : constant Node_Id := Original_Node (Given_S1); | |
8020 | S2 : constant Node_Id := Original_Node (Given_S2); | |
8021 | ||
8022 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
8023 | -- Special-case for a bound given by a discriminant, which in the body |
8024 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
8025 | |
8026 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 8027 | -- Check both bounds |
fbf5a39b | 8028 | |
5d37ba92 ES |
8029 | ----------------------- |
8030 | -- Conforming_Bounds -- | |
8031 | ----------------------- | |
8032 | ||
fbf5a39b AC |
8033 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
8034 | begin | |
8035 | if Is_Entity_Name (B1) | |
8036 | and then Is_Entity_Name (B2) | |
8037 | and then Ekind (Entity (B1)) = E_Discriminant | |
8038 | then | |
8039 | return Chars (B1) = Chars (B2); | |
8040 | ||
8041 | else | |
8042 | return Fully_Conformant_Expressions (B1, B2); | |
8043 | end if; | |
8044 | end Conforming_Bounds; | |
8045 | ||
5d37ba92 ES |
8046 | ----------------------- |
8047 | -- Conforming_Ranges -- | |
8048 | ----------------------- | |
8049 | ||
fbf5a39b AC |
8050 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
8051 | begin | |
8052 | return | |
8053 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
8054 | and then | |
8055 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
8056 | end Conforming_Ranges; | |
8057 | ||
8058 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
8059 | ||
8060 | begin | |
8061 | if Nkind (S1) /= Nkind (S2) then | |
8062 | return False; | |
8063 | ||
8064 | elsif Is_Entity_Name (S1) then | |
8065 | return Entity (S1) = Entity (S2); | |
8066 | ||
8067 | elsif Nkind (S1) = N_Range then | |
8068 | return Conforming_Ranges (S1, S2); | |
8069 | ||
8070 | elsif Nkind (S1) = N_Subtype_Indication then | |
8071 | return | |
8072 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
8073 | and then | |
8074 | Conforming_Ranges | |
8075 | (Range_Expression (Constraint (S1)), | |
8076 | Range_Expression (Constraint (S2))); | |
8077 | else | |
8078 | return True; | |
8079 | end if; | |
8080 | end Fully_Conformant_Discrete_Subtypes; | |
8081 | ||
996ae0b0 RK |
8082 | -------------------- |
8083 | -- Install_Entity -- | |
8084 | -------------------- | |
8085 | ||
8086 | procedure Install_Entity (E : Entity_Id) is | |
8087 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
8088 | begin |
8089 | Set_Is_Immediately_Visible (E); | |
8090 | Set_Current_Entity (E); | |
8091 | Set_Homonym (E, Prev); | |
8092 | end Install_Entity; | |
8093 | ||
8094 | --------------------- | |
8095 | -- Install_Formals -- | |
8096 | --------------------- | |
8097 | ||
8098 | procedure Install_Formals (Id : Entity_Id) is | |
8099 | F : Entity_Id; | |
996ae0b0 RK |
8100 | begin |
8101 | F := First_Formal (Id); | |
996ae0b0 RK |
8102 | while Present (F) loop |
8103 | Install_Entity (F); | |
8104 | Next_Formal (F); | |
8105 | end loop; | |
8106 | end Install_Formals; | |
8107 | ||
ce2b6ba5 JM |
8108 | ----------------------------- |
8109 | -- Is_Interface_Conformant -- | |
8110 | ----------------------------- | |
8111 | ||
8112 | function Is_Interface_Conformant | |
8113 | (Tagged_Type : Entity_Id; | |
8114 | Iface_Prim : Entity_Id; | |
8115 | Prim : Entity_Id) return Boolean | |
8116 | is | |
9e92ad49 AC |
8117 | -- The operation may in fact be an inherited (implicit) operation |
8118 | -- rather than the original interface primitive, so retrieve the | |
8119 | -- ultimate ancestor. | |
8120 | ||
8121 | Iface : constant Entity_Id := | |
8122 | Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); | |
fceeaab6 ES |
8123 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
8124 | ||
25ebc085 AC |
8125 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
8126 | -- Return the controlling formal of Prim | |
8127 | ||
59e6b23c AC |
8128 | ------------------------ |
8129 | -- Controlling_Formal -- | |
8130 | ------------------------ | |
8131 | ||
25ebc085 | 8132 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
15918371 | 8133 | E : Entity_Id; |
59e6b23c | 8134 | |
25ebc085 | 8135 | begin |
15918371 | 8136 | E := First_Entity (Prim); |
25ebc085 AC |
8137 | while Present (E) loop |
8138 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
8139 | return E; | |
8140 | end if; | |
8141 | ||
8142 | Next_Entity (E); | |
8143 | end loop; | |
8144 | ||
8145 | return Empty; | |
8146 | end Controlling_Formal; | |
8147 | ||
8148 | -- Local variables | |
8149 | ||
8150 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
8151 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
8152 | ||
8153 | -- Start of processing for Is_Interface_Conformant | |
8154 | ||
ce2b6ba5 JM |
8155 | begin |
8156 | pragma Assert (Is_Subprogram (Iface_Prim) | |
8157 | and then Is_Subprogram (Prim) | |
8158 | and then Is_Dispatching_Operation (Iface_Prim) | |
8159 | and then Is_Dispatching_Operation (Prim)); | |
8160 | ||
fceeaab6 | 8161 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
8162 | or else (Present (Alias (Iface_Prim)) |
8163 | and then | |
8164 | Is_Interface | |
8165 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
8166 | ||
8167 | if Prim = Iface_Prim | |
8168 | or else not Is_Subprogram (Prim) | |
8169 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
8170 | or else not Is_Dispatching_Operation (Prim) | |
8171 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 | 8172 | or else No (Typ) |
8a49a499 | 8173 | or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
ce2b6ba5 JM |
8174 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
8175 | then | |
8176 | return False; | |
8177 | ||
25ebc085 AC |
8178 | -- The mode of the controlling formals must match |
8179 | ||
8180 | elsif Present (Iface_Ctrl_F) | |
15918371 AC |
8181 | and then Present (Prim_Ctrl_F) |
8182 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
25ebc085 AC |
8183 | then |
8184 | return False; | |
8185 | ||
8186 | -- Case of a procedure, or a function whose result type matches the | |
8187 | -- result type of the interface primitive, or a function that has no | |
8188 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
8189 | |
8190 | elsif Ekind (Iface_Prim) = E_Procedure | |
8191 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 8192 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 8193 | then |
b4d7b435 AC |
8194 | return Type_Conformant |
8195 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 8196 | |
2995860f AC |
8197 | -- Case of a function returning an interface, or an access to one. Check |
8198 | -- that the return types correspond. | |
ce2b6ba5 | 8199 | |
fceeaab6 ES |
8200 | elsif Implements_Interface (Typ, Iface) then |
8201 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
8202 | /= |
8203 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
8204 | then |
8205 | return False; | |
fceeaab6 ES |
8206 | else |
8207 | return | |
9e92ad49 | 8208 | Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
ce2b6ba5 | 8209 | Skip_Controlling_Formals => True); |
fceeaab6 | 8210 | end if; |
ce2b6ba5 | 8211 | |
fceeaab6 ES |
8212 | else |
8213 | return False; | |
ce2b6ba5 | 8214 | end if; |
ce2b6ba5 JM |
8215 | end Is_Interface_Conformant; |
8216 | ||
996ae0b0 RK |
8217 | --------------------------------- |
8218 | -- Is_Non_Overriding_Operation -- | |
8219 | --------------------------------- | |
8220 | ||
8221 | function Is_Non_Overriding_Operation | |
8222 | (Prev_E : Entity_Id; | |
d05ef0ab | 8223 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
8224 | is |
8225 | Formal : Entity_Id; | |
8226 | F_Typ : Entity_Id; | |
8227 | G_Typ : Entity_Id := Empty; | |
8228 | ||
8229 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
8230 | -- If F_Type is a derived type associated with a generic actual subtype, |
8231 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
8232 | |
8233 | function Types_Correspond | |
8234 | (P_Type : Entity_Id; | |
d05ef0ab | 8235 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
8236 | -- Returns true if and only if the types (or designated types in the |
8237 | -- case of anonymous access types) are the same or N_Type is derived | |
8238 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
8239 | |
8240 | ----------------------------- | |
8241 | -- Get_Generic_Parent_Type -- | |
8242 | ----------------------------- | |
8243 | ||
8244 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
8245 | G_Typ : Entity_Id; | |
702d2020 | 8246 | Defn : Node_Id; |
996ae0b0 RK |
8247 | Indic : Node_Id; |
8248 | ||
8249 | begin | |
8250 | if Is_Derived_Type (F_Typ) | |
8251 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
8252 | then | |
82c80734 RD |
8253 | -- The tree must be traversed to determine the parent subtype in |
8254 | -- the generic unit, which unfortunately isn't always available | |
8255 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
8256 | -- is needed for cases where a full derived type has been | |
8257 | -- rewritten.) | |
996ae0b0 | 8258 | |
bff469f7 AC |
8259 | -- If the parent type is a scalar type, the derivation creates |
8260 | -- an anonymous base type for it, and the source type is its | |
8261 | -- first subtype. | |
8262 | ||
8263 | if Is_Scalar_Type (F_Typ) | |
8264 | and then not Comes_From_Source (F_Typ) | |
8265 | then | |
8266 | Defn := | |
8267 | Type_Definition | |
0c6826a5 | 8268 | (Original_Node (Parent (First_Subtype (F_Typ)))); |
bff469f7 AC |
8269 | else |
8270 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); | |
8271 | end if; | |
702d2020 AC |
8272 | if Nkind (Defn) = N_Derived_Type_Definition then |
8273 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 8274 | |
702d2020 AC |
8275 | if Nkind (Indic) = N_Subtype_Indication then |
8276 | G_Typ := Entity (Subtype_Mark (Indic)); | |
8277 | else | |
8278 | G_Typ := Entity (Indic); | |
8279 | end if; | |
996ae0b0 | 8280 | |
702d2020 AC |
8281 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
8282 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
8283 | then | |
8284 | return Generic_Parent_Type (Parent (G_Typ)); | |
8285 | end if; | |
996ae0b0 RK |
8286 | end if; |
8287 | end if; | |
8288 | ||
8289 | return Empty; | |
8290 | end Get_Generic_Parent_Type; | |
8291 | ||
8292 | ---------------------- | |
8293 | -- Types_Correspond -- | |
8294 | ---------------------- | |
8295 | ||
8296 | function Types_Correspond | |
8297 | (P_Type : Entity_Id; | |
d05ef0ab | 8298 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
8299 | is |
8300 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
8301 | New_Type : Entity_Id := Base_Type (N_Type); | |
8302 | ||
8303 | begin | |
8304 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
8305 | Prev_Type := Designated_Type (Prev_Type); | |
8306 | end if; | |
8307 | ||
8308 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
8309 | New_Type := Designated_Type (New_Type); | |
8310 | end if; | |
8311 | ||
8312 | if Prev_Type = New_Type then | |
8313 | return True; | |
8314 | ||
8315 | elsif not Is_Class_Wide_Type (New_Type) then | |
8316 | while Etype (New_Type) /= New_Type loop | |
8317 | New_Type := Etype (New_Type); | |
0c6826a5 | 8318 | |
996ae0b0 RK |
8319 | if New_Type = Prev_Type then |
8320 | return True; | |
8321 | end if; | |
8322 | end loop; | |
8323 | end if; | |
8324 | return False; | |
8325 | end Types_Correspond; | |
8326 | ||
8327 | -- Start of processing for Is_Non_Overriding_Operation | |
8328 | ||
8329 | begin | |
82c80734 RD |
8330 | -- In the case where both operations are implicit derived subprograms |
8331 | -- then neither overrides the other. This can only occur in certain | |
8332 | -- obscure cases (e.g., derivation from homographs created in a generic | |
8333 | -- instantiation). | |
996ae0b0 RK |
8334 | |
8335 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
8336 | return True; | |
8337 | ||
8338 | elsif Ekind (Current_Scope) = E_Package | |
8339 | and then Is_Generic_Instance (Current_Scope) | |
8340 | and then In_Private_Part (Current_Scope) | |
8341 | and then Comes_From_Source (New_E) | |
8342 | then | |
702d2020 AC |
8343 | -- We examine the formals and result type of the inherited operation, |
8344 | -- to determine whether their type is derived from (the instance of) | |
8345 | -- a generic type. The first such formal or result type is the one | |
8346 | -- tested. | |
996ae0b0 RK |
8347 | |
8348 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
8349 | while Present (Formal) loop |
8350 | F_Typ := Base_Type (Etype (Formal)); | |
8351 | ||
8352 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
8353 | F_Typ := Designated_Type (F_Typ); | |
8354 | end if; | |
8355 | ||
8356 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 8357 | exit when Present (G_Typ); |
996ae0b0 RK |
8358 | |
8359 | Next_Formal (Formal); | |
8360 | end loop; | |
8361 | ||
c8ef728f | 8362 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
8363 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
8364 | end if; | |
8365 | ||
8366 | if No (G_Typ) then | |
8367 | return False; | |
8368 | end if; | |
8369 | ||
8dbd1460 AC |
8370 | -- If the generic type is a private type, then the original operation |
8371 | -- was not overriding in the generic, because there was no primitive | |
8372 | -- operation to override. | |
996ae0b0 RK |
8373 | |
8374 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
8375 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 8376 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
8377 | then |
8378 | return True; | |
8379 | ||
8380 | -- The generic parent type is the ancestor of a formal derived | |
8381 | -- type declaration. We need to check whether it has a primitive | |
8382 | -- operation that should be overridden by New_E in the generic. | |
8383 | ||
8384 | else | |
8385 | declare | |
8386 | P_Formal : Entity_Id; | |
8387 | N_Formal : Entity_Id; | |
8388 | P_Typ : Entity_Id; | |
8389 | N_Typ : Entity_Id; | |
8390 | P_Prim : Entity_Id; | |
8391 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
8392 | ||
8393 | begin | |
8394 | while Present (Prim_Elt) loop | |
8395 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 8396 | |
996ae0b0 RK |
8397 | if Chars (P_Prim) = Chars (New_E) |
8398 | and then Ekind (P_Prim) = Ekind (New_E) | |
8399 | then | |
8400 | P_Formal := First_Formal (P_Prim); | |
8401 | N_Formal := First_Formal (New_E); | |
8402 | while Present (P_Formal) and then Present (N_Formal) loop | |
8403 | P_Typ := Etype (P_Formal); | |
8404 | N_Typ := Etype (N_Formal); | |
8405 | ||
8406 | if not Types_Correspond (P_Typ, N_Typ) then | |
8407 | exit; | |
8408 | end if; | |
8409 | ||
8410 | Next_Entity (P_Formal); | |
8411 | Next_Entity (N_Formal); | |
8412 | end loop; | |
8413 | ||
82c80734 RD |
8414 | -- Found a matching primitive operation belonging to the |
8415 | -- formal ancestor type, so the new subprogram is | |
8416 | -- overriding. | |
996ae0b0 | 8417 | |
c8ef728f ES |
8418 | if No (P_Formal) |
8419 | and then No (N_Formal) | |
996ae0b0 RK |
8420 | and then (Ekind (New_E) /= E_Function |
8421 | or else | |
8fde064e AC |
8422 | Types_Correspond |
8423 | (Etype (P_Prim), Etype (New_E))) | |
996ae0b0 RK |
8424 | then |
8425 | return False; | |
8426 | end if; | |
8427 | end if; | |
8428 | ||
8429 | Next_Elmt (Prim_Elt); | |
8430 | end loop; | |
8431 | ||
2995860f AC |
8432 | -- If no match found, then the new subprogram does not override |
8433 | -- in the generic (nor in the instance). | |
996ae0b0 | 8434 | |
260359e3 AC |
8435 | -- If the type in question is not abstract, and the subprogram |
8436 | -- is, this will be an error if the new operation is in the | |
8437 | -- private part of the instance. Emit a warning now, which will | |
8438 | -- make the subsequent error message easier to understand. | |
8439 | ||
8440 | if not Is_Abstract_Type (F_Typ) | |
8441 | and then Is_Abstract_Subprogram (Prev_E) | |
8442 | and then In_Private_Part (Current_Scope) | |
8443 | then | |
8444 | Error_Msg_Node_2 := F_Typ; | |
8445 | Error_Msg_NE | |
3ccedacc AC |
8446 | ("private operation& in generic unit does not override " |
8447 | & "any primitive operation of& (RM 12.3 (18))??", | |
260359e3 AC |
8448 | New_E, New_E); |
8449 | end if; | |
8450 | ||
996ae0b0 RK |
8451 | return True; |
8452 | end; | |
8453 | end if; | |
8454 | else | |
8455 | return False; | |
8456 | end if; | |
8457 | end Is_Non_Overriding_Operation; | |
8458 | ||
beacce02 AC |
8459 | ------------------------------------- |
8460 | -- List_Inherited_Pre_Post_Aspects -- | |
8461 | ------------------------------------- | |
8462 | ||
8463 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
8464 | begin | |
e606088a | 8465 | if Opt.List_Inherited_Aspects |
b9696ffb | 8466 | and then Is_Subprogram_Or_Generic_Subprogram (E) |
beacce02 AC |
8467 | then |
8468 | declare | |
c9d70ab1 AC |
8469 | Subps : constant Subprogram_List := Inherited_Subprograms (E); |
8470 | Items : Node_Id; | |
8471 | Prag : Node_Id; | |
beacce02 AC |
8472 | |
8473 | begin | |
c9d70ab1 AC |
8474 | for Index in Subps'Range loop |
8475 | Items := Contract (Subps (Index)); | |
8476 | ||
8477 | if Present (Items) then | |
8478 | Prag := Pre_Post_Conditions (Items); | |
8479 | while Present (Prag) loop | |
8480 | Error_Msg_Sloc := Sloc (Prag); | |
8481 | ||
8482 | if Class_Present (Prag) | |
8483 | and then not Split_PPC (Prag) | |
8484 | then | |
8485 | if Pragma_Name (Prag) = Name_Precondition then | |
8486 | Error_Msg_N | |
8487 | ("info: & inherits `Pre''Class` aspect from " | |
8488 | & "#?L?", E); | |
8489 | else | |
8490 | Error_Msg_N | |
8491 | ("info: & inherits `Post''Class` aspect from " | |
8492 | & "#?L?", E); | |
8493 | end if; | |
beacce02 | 8494 | end if; |
beacce02 | 8495 | |
c9d70ab1 AC |
8496 | Prag := Next_Pragma (Prag); |
8497 | end loop; | |
8498 | end if; | |
beacce02 AC |
8499 | end loop; |
8500 | end; | |
8501 | end if; | |
8502 | end List_Inherited_Pre_Post_Aspects; | |
8503 | ||
996ae0b0 RK |
8504 | ------------------------------ |
8505 | -- Make_Inequality_Operator -- | |
8506 | ------------------------------ | |
8507 | ||
8508 | -- S is the defining identifier of an equality operator. We build a | |
8509 | -- subprogram declaration with the right signature. This operation is | |
8510 | -- intrinsic, because it is always expanded as the negation of the | |
8511 | -- call to the equality function. | |
8512 | ||
8513 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
8514 | Loc : constant Source_Ptr := Sloc (S); | |
8515 | Decl : Node_Id; | |
8516 | Formals : List_Id; | |
8517 | Op_Name : Entity_Id; | |
8518 | ||
c8ef728f ES |
8519 | FF : constant Entity_Id := First_Formal (S); |
8520 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
8521 | |
8522 | begin | |
c8ef728f | 8523 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 8524 | |
c8ef728f | 8525 | if No (NF) then |
996ae0b0 RK |
8526 | return; |
8527 | end if; | |
8528 | ||
c8ef728f ES |
8529 | declare |
8530 | A : constant Entity_Id := | |
8531 | Make_Defining_Identifier (Sloc (FF), | |
8532 | Chars => Chars (FF)); | |
8533 | ||
5d37ba92 ES |
8534 | B : constant Entity_Id := |
8535 | Make_Defining_Identifier (Sloc (NF), | |
8536 | Chars => Chars (NF)); | |
c8ef728f ES |
8537 | |
8538 | begin | |
8539 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
8540 | ||
8541 | Formals := New_List ( | |
8542 | Make_Parameter_Specification (Loc, | |
8543 | Defining_Identifier => A, | |
8544 | Parameter_Type => | |
e4494292 | 8545 | New_Occurrence_Of (Etype (First_Formal (S)), |
c8ef728f ES |
8546 | Sloc (Etype (First_Formal (S))))), |
8547 | ||
8548 | Make_Parameter_Specification (Loc, | |
8549 | Defining_Identifier => B, | |
8550 | Parameter_Type => | |
e4494292 | 8551 | New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
c8ef728f ES |
8552 | Sloc (Etype (Next_Formal (First_Formal (S))))))); |
8553 | ||
8554 | Decl := | |
8555 | Make_Subprogram_Declaration (Loc, | |
8556 | Specification => | |
8557 | Make_Function_Specification (Loc, | |
8558 | Defining_Unit_Name => Op_Name, | |
8559 | Parameter_Specifications => Formals, | |
8560 | Result_Definition => | |
e4494292 | 8561 | New_Occurrence_Of (Standard_Boolean, Loc))); |
c8ef728f ES |
8562 | |
8563 | -- Insert inequality right after equality if it is explicit or after | |
8564 | -- the derived type when implicit. These entities are created only | |
2995860f AC |
8565 | -- for visibility purposes, and eventually replaced in the course |
8566 | -- of expansion, so they do not need to be attached to the tree and | |
8567 | -- seen by the back-end. Keeping them internal also avoids spurious | |
c8ef728f ES |
8568 | -- freezing problems. The declaration is inserted in the tree for |
8569 | -- analysis, and removed afterwards. If the equality operator comes | |
8570 | -- from an explicit declaration, attach the inequality immediately | |
8571 | -- after. Else the equality is inherited from a derived type | |
8572 | -- declaration, so insert inequality after that declaration. | |
8573 | ||
8574 | if No (Alias (S)) then | |
8575 | Insert_After (Unit_Declaration_Node (S), Decl); | |
8576 | elsif Is_List_Member (Parent (S)) then | |
8577 | Insert_After (Parent (S), Decl); | |
8578 | else | |
8579 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
8580 | end if; | |
996ae0b0 | 8581 | |
c8ef728f ES |
8582 | Mark_Rewrite_Insertion (Decl); |
8583 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
8584 | Analyze (Decl); | |
8585 | Remove (Decl); | |
8586 | Set_Has_Completion (Op_Name); | |
8587 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 8588 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 8589 | end; |
996ae0b0 RK |
8590 | end Make_Inequality_Operator; |
8591 | ||
8592 | ---------------------- | |
8593 | -- May_Need_Actuals -- | |
8594 | ---------------------- | |
8595 | ||
8596 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
8597 | F : Entity_Id; | |
8598 | B : Boolean; | |
8599 | ||
8600 | begin | |
8601 | F := First_Formal (Fun); | |
8602 | B := True; | |
996ae0b0 RK |
8603 | while Present (F) loop |
8604 | if No (Default_Value (F)) then | |
8605 | B := False; | |
8606 | exit; | |
8607 | end if; | |
8608 | ||
8609 | Next_Formal (F); | |
8610 | end loop; | |
8611 | ||
8612 | Set_Needs_No_Actuals (Fun, B); | |
8613 | end May_Need_Actuals; | |
8614 | ||
8615 | --------------------- | |
8616 | -- Mode_Conformant -- | |
8617 | --------------------- | |
8618 | ||
8619 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
8620 | Result : Boolean; | |
996ae0b0 RK |
8621 | begin |
8622 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
8623 | return Result; | |
8624 | end Mode_Conformant; | |
8625 | ||
8626 | --------------------------- | |
8627 | -- New_Overloaded_Entity -- | |
8628 | --------------------------- | |
8629 | ||
8630 | procedure New_Overloaded_Entity | |
8631 | (S : Entity_Id; | |
8632 | Derived_Type : Entity_Id := Empty) | |
8633 | is | |
ec4867fa | 8634 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
8635 | -- Set if the current scope has an operation that is type-conformant |
8636 | -- with S, and becomes hidden by S. | |
8637 | ||
5d37ba92 ES |
8638 | Is_Primitive_Subp : Boolean; |
8639 | -- Set to True if the new subprogram is primitive | |
8640 | ||
fbf5a39b AC |
8641 | E : Entity_Id; |
8642 | -- Entity that S overrides | |
8643 | ||
996ae0b0 | 8644 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
8645 | -- Predecessor of E in Homonym chain |
8646 | ||
5d37ba92 ES |
8647 | procedure Check_For_Primitive_Subprogram |
8648 | (Is_Primitive : out Boolean; | |
8649 | Is_Overriding : Boolean := False); | |
8650 | -- If the subprogram being analyzed is a primitive operation of the type | |
8651 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
8652 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
8653 | -- corresponding flag on the entity itself for later use. | |
8654 | ||
ec4867fa ES |
8655 | procedure Check_Synchronized_Overriding |
8656 | (Def_Id : Entity_Id; | |
ec4867fa ES |
8657 | Overridden_Subp : out Entity_Id); |
8658 | -- First determine if Def_Id is an entry or a subprogram either defined | |
8659 | -- in the scope of a task or protected type, or is a primitive of such | |
8660 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
8661 | -- implemented by the synchronized type, return the overridden entity | |
8662 | -- or Empty. | |
758c442c | 8663 | |
996ae0b0 RK |
8664 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
8665 | -- Check that E is declared in the private part of the current package, | |
8666 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 8667 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
8668 | -- set when freezing entities, so we must examine the place of the |
8669 | -- declaration in the tree, and recognize wrapper packages as well. | |
8670 | ||
2ddc2000 AC |
8671 | function Is_Overriding_Alias |
8672 | (Old_E : Entity_Id; | |
8673 | New_E : Entity_Id) return Boolean; | |
8674 | -- Check whether new subprogram and old subprogram are both inherited | |
8675 | -- from subprograms that have distinct dispatch table entries. This can | |
2995860f AC |
8676 | -- occur with derivations from instances with accidental homonyms. The |
8677 | -- function is conservative given that the converse is only true within | |
8678 | -- instances that contain accidental overloadings. | |
2ddc2000 | 8679 | |
5d37ba92 ES |
8680 | ------------------------------------ |
8681 | -- Check_For_Primitive_Subprogram -- | |
8682 | ------------------------------------ | |
996ae0b0 | 8683 | |
5d37ba92 ES |
8684 | procedure Check_For_Primitive_Subprogram |
8685 | (Is_Primitive : out Boolean; | |
8686 | Is_Overriding : Boolean := False) | |
ec4867fa | 8687 | is |
996ae0b0 RK |
8688 | Formal : Entity_Id; |
8689 | F_Typ : Entity_Id; | |
07fc65c4 | 8690 | B_Typ : Entity_Id; |
996ae0b0 RK |
8691 | |
8692 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
8693 | -- Returns true if T is declared in the visible part of the current |
8694 | -- package scope; otherwise returns false. Assumes that T is declared | |
8695 | -- in a package. | |
996ae0b0 RK |
8696 | |
8697 | procedure Check_Private_Overriding (T : Entity_Id); | |
8698 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
8699 | -- abstract type is declared in a private part, then it must override |
8700 | -- an abstract subprogram declared in the visible part. Also checks | |
8701 | -- that if a primitive function with a controlling result is declared | |
8702 | -- in a private part, then it must override a function declared in | |
8703 | -- the visible part. | |
996ae0b0 RK |
8704 | |
8705 | ------------------------------ | |
8706 | -- Check_Private_Overriding -- | |
8707 | ------------------------------ | |
8708 | ||
8709 | procedure Check_Private_Overriding (T : Entity_Id) is | |
acf624f2 | 8710 | |
aaeb3b3a AC |
8711 | function Overrides_Visible_Function |
8712 | (Partial_View : Entity_Id) return Boolean; | |
acf624f2 BD |
8713 | -- True if S overrides a function in the visible part. The |
8714 | -- overridden function could be explicitly or implicitly declared. | |
8715 | ||
aaeb3b3a AC |
8716 | function Overrides_Visible_Function |
8717 | (Partial_View : Entity_Id) return Boolean | |
8718 | is | |
acf624f2 BD |
8719 | begin |
8720 | if not Is_Overriding or else not Has_Homonym (S) then | |
8721 | return False; | |
8722 | end if; | |
8723 | ||
aaeb3b3a | 8724 | if not Present (Partial_View) then |
acf624f2 BD |
8725 | return True; |
8726 | end if; | |
8727 | ||
8728 | -- Search through all the homonyms H of S in the current | |
8729 | -- package spec, and return True if we find one that matches. | |
8730 | -- Note that Parent (H) will be the declaration of the | |
aaeb3b3a | 8731 | -- partial view of T for a match. |
acf624f2 BD |
8732 | |
8733 | declare | |
8734 | H : Entity_Id := S; | |
8735 | begin | |
8736 | loop | |
8737 | H := Homonym (H); | |
8738 | exit when not Present (H) or else Scope (H) /= Scope (S); | |
8739 | ||
8740 | if Nkind_In | |
8741 | (Parent (H), | |
8742 | N_Private_Extension_Declaration, | |
8743 | N_Private_Type_Declaration) | |
aaeb3b3a | 8744 | and then Defining_Identifier (Parent (H)) = Partial_View |
acf624f2 BD |
8745 | then |
8746 | return True; | |
8747 | end if; | |
8748 | end loop; | |
8749 | end; | |
8750 | ||
8751 | return False; | |
8752 | end Overrides_Visible_Function; | |
8753 | ||
8754 | -- Start of processing for Check_Private_Overriding | |
8755 | ||
996ae0b0 | 8756 | begin |
51c16e29 | 8757 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
8758 | and then In_Private_Part (Current_Scope) |
8759 | and then Visible_Part_Type (T) | |
8760 | and then not In_Instance | |
8761 | then | |
f937473f RD |
8762 | if Is_Abstract_Type (T) |
8763 | and then Is_Abstract_Subprogram (S) | |
8764 | and then (not Is_Overriding | |
8dbd1460 | 8765 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 8766 | then |
3ccedacc AC |
8767 | Error_Msg_N ("abstract subprograms must be visible " |
8768 | & "(RM 3.9.3(10))!", S); | |
758c442c | 8769 | |
aaeb3b3a AC |
8770 | elsif Ekind (S) = E_Function then |
8771 | declare | |
8772 | Partial_View : constant Entity_Id := | |
8773 | Incomplete_Or_Partial_View (T); | |
2e79de51 | 8774 | |
aaeb3b3a AC |
8775 | begin |
8776 | if not Overrides_Visible_Function (Partial_View) then | |
8777 | ||
8778 | -- Here, S is "function ... return T;" declared in | |
8779 | -- the private part, not overriding some visible | |
8780 | -- operation. That's illegal in the tagged case | |
8781 | -- (but not if the private type is untagged). | |
8782 | ||
8783 | if ((Present (Partial_View) | |
8784 | and then Is_Tagged_Type (Partial_View)) | |
8785 | or else (not Present (Partial_View) | |
8786 | and then Is_Tagged_Type (T))) | |
8787 | and then T = Base_Type (Etype (S)) | |
8788 | then | |
8789 | Error_Msg_N | |
8790 | ("private function with tagged result must" | |
8791 | & " override visible-part function", S); | |
8792 | Error_Msg_N | |
8793 | ("\move subprogram to the visible part" | |
8794 | & " (RM 3.9.3(10))", S); | |
8795 | ||
8796 | -- AI05-0073: extend this test to the case of a | |
8797 | -- function with a controlling access result. | |
8798 | ||
8799 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
8800 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
8801 | and then | |
8802 | not Is_Class_Wide_Type | |
8803 | (Designated_Type (Etype (S))) | |
8804 | and then Ada_Version >= Ada_2012 | |
8805 | then | |
8806 | Error_Msg_N | |
8807 | ("private function with controlling access " | |
8808 | & "result must override visible-part function", | |
8809 | S); | |
8810 | Error_Msg_N | |
8811 | ("\move subprogram to the visible part" | |
8812 | & " (RM 3.9.3(10))", S); | |
8813 | end if; | |
8814 | end if; | |
8815 | end; | |
996ae0b0 RK |
8816 | end if; |
8817 | end if; | |
8818 | end Check_Private_Overriding; | |
8819 | ||
8820 | ----------------------- | |
8821 | -- Visible_Part_Type -- | |
8822 | ----------------------- | |
8823 | ||
8824 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
8825 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
8826 | N : Node_Id; | |
996ae0b0 RK |
8827 | |
8828 | begin | |
8dbd1460 AC |
8829 | -- If the entity is a private type, then it must be declared in a |
8830 | -- visible part. | |
996ae0b0 RK |
8831 | |
8832 | if Ekind (T) in Private_Kind then | |
8833 | return True; | |
8834 | end if; | |
8835 | ||
8836 | -- Otherwise, we traverse the visible part looking for its | |
8837 | -- corresponding declaration. We cannot use the declaration | |
8838 | -- node directly because in the private part the entity of a | |
8839 | -- private type is the one in the full view, which does not | |
8840 | -- indicate that it is the completion of something visible. | |
8841 | ||
07fc65c4 | 8842 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
8843 | while Present (N) loop |
8844 | if Nkind (N) = N_Full_Type_Declaration | |
8845 | and then Present (Defining_Identifier (N)) | |
8846 | and then T = Defining_Identifier (N) | |
8847 | then | |
8848 | return True; | |
8849 | ||
800621e0 RD |
8850 | elsif Nkind_In (N, N_Private_Type_Declaration, |
8851 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
8852 | and then Present (Defining_Identifier (N)) |
8853 | and then T = Full_View (Defining_Identifier (N)) | |
8854 | then | |
8855 | return True; | |
8856 | end if; | |
8857 | ||
8858 | Next (N); | |
8859 | end loop; | |
8860 | ||
8861 | return False; | |
8862 | end Visible_Part_Type; | |
8863 | ||
5d37ba92 | 8864 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
8865 | |
8866 | begin | |
5d37ba92 ES |
8867 | Is_Primitive := False; |
8868 | ||
996ae0b0 RK |
8869 | if not Comes_From_Source (S) then |
8870 | null; | |
8871 | ||
5d37ba92 | 8872 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
8873 | |
8874 | elsif Current_Scope = Standard_Standard then | |
8875 | null; | |
8876 | ||
b9b2405f | 8877 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 8878 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 8879 | or else Is_Overriding |
996ae0b0 | 8880 | then |
07fc65c4 | 8881 | -- For function, check return type |
996ae0b0 | 8882 | |
07fc65c4 | 8883 | if Ekind (S) = E_Function then |
5d37ba92 ES |
8884 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
8885 | F_Typ := Designated_Type (Etype (S)); | |
8886 | else | |
8887 | F_Typ := Etype (S); | |
8888 | end if; | |
8889 | ||
8890 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 8891 | |
5d37ba92 ES |
8892 | if Scope (B_Typ) = Current_Scope |
8893 | and then not Is_Class_Wide_Type (B_Typ) | |
8894 | and then not Is_Generic_Type (B_Typ) | |
8895 | then | |
8896 | Is_Primitive := True; | |
07fc65c4 | 8897 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 8898 | Set_Is_Primitive (S); |
07fc65c4 GB |
8899 | Check_Private_Overriding (B_Typ); |
8900 | end if; | |
996ae0b0 RK |
8901 | end if; |
8902 | ||
07fc65c4 | 8903 | -- For all subprograms, check formals |
996ae0b0 | 8904 | |
07fc65c4 | 8905 | Formal := First_Formal (S); |
996ae0b0 RK |
8906 | while Present (Formal) loop |
8907 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
8908 | F_Typ := Designated_Type (Etype (Formal)); | |
8909 | else | |
8910 | F_Typ := Etype (Formal); | |
8911 | end if; | |
8912 | ||
07fc65c4 GB |
8913 | B_Typ := Base_Type (F_Typ); |
8914 | ||
ec4867fa ES |
8915 | if Ekind (B_Typ) = E_Access_Subtype then |
8916 | B_Typ := Base_Type (B_Typ); | |
8917 | end if; | |
8918 | ||
5d37ba92 ES |
8919 | if Scope (B_Typ) = Current_Scope |
8920 | and then not Is_Class_Wide_Type (B_Typ) | |
8921 | and then not Is_Generic_Type (B_Typ) | |
8922 | then | |
8923 | Is_Primitive := True; | |
8924 | Set_Is_Primitive (S); | |
07fc65c4 GB |
8925 | Set_Has_Primitive_Operations (B_Typ); |
8926 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
8927 | end if; |
8928 | ||
8929 | Next_Formal (Formal); | |
8930 | end loop; | |
1aee1fb3 AC |
8931 | |
8932 | -- Special case: An equality function can be redefined for a type | |
8933 | -- occurring in a declarative part, and won't otherwise be treated as | |
8934 | -- a primitive because it doesn't occur in a package spec and doesn't | |
8935 | -- override an inherited subprogram. It's important that we mark it | |
8936 | -- primitive so it can be returned by Collect_Primitive_Operations | |
8937 | -- and be used in composing the equality operation of later types | |
8938 | -- that have a component of the type. | |
8939 | ||
8940 | elsif Chars (S) = Name_Op_Eq | |
8941 | and then Etype (S) = Standard_Boolean | |
8942 | then | |
8943 | B_Typ := Base_Type (Etype (First_Formal (S))); | |
8944 | ||
8945 | if Scope (B_Typ) = Current_Scope | |
8946 | and then | |
8947 | Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ | |
8948 | and then not Is_Limited_Type (B_Typ) | |
8949 | then | |
8950 | Is_Primitive := True; | |
8951 | Set_Is_Primitive (S); | |
8952 | Set_Has_Primitive_Operations (B_Typ); | |
8953 | Check_Private_Overriding (B_Typ); | |
8954 | end if; | |
996ae0b0 | 8955 | end if; |
5d37ba92 ES |
8956 | end Check_For_Primitive_Subprogram; |
8957 | ||
8958 | ----------------------------------- | |
8959 | -- Check_Synchronized_Overriding -- | |
8960 | ----------------------------------- | |
8961 | ||
8962 | procedure Check_Synchronized_Overriding | |
8963 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
8964 | Overridden_Subp : out Entity_Id) |
8965 | is | |
5d37ba92 ES |
8966 | Ifaces_List : Elist_Id; |
8967 | In_Scope : Boolean; | |
8968 | Typ : Entity_Id; | |
8969 | ||
8aa15e3b JM |
8970 | function Matches_Prefixed_View_Profile |
8971 | (Prim_Params : List_Id; | |
8972 | Iface_Params : List_Id) return Boolean; | |
8973 | -- Determine whether a subprogram's parameter profile Prim_Params | |
8974 | -- matches that of a potentially overridden interface subprogram | |
8975 | -- Iface_Params. Also determine if the type of first parameter of | |
8976 | -- Iface_Params is an implemented interface. | |
8977 | ||
8aa15e3b JM |
8978 | ----------------------------------- |
8979 | -- Matches_Prefixed_View_Profile -- | |
8980 | ----------------------------------- | |
8981 | ||
8982 | function Matches_Prefixed_View_Profile | |
8983 | (Prim_Params : List_Id; | |
8984 | Iface_Params : List_Id) return Boolean | |
8985 | is | |
8986 | Iface_Id : Entity_Id; | |
8987 | Iface_Param : Node_Id; | |
8988 | Iface_Typ : Entity_Id; | |
8989 | Prim_Id : Entity_Id; | |
8990 | Prim_Param : Node_Id; | |
8991 | Prim_Typ : Entity_Id; | |
8992 | ||
8993 | function Is_Implemented | |
8994 | (Ifaces_List : Elist_Id; | |
8995 | Iface : Entity_Id) return Boolean; | |
8996 | -- Determine if Iface is implemented by the current task or | |
8997 | -- protected type. | |
8998 | ||
8999 | -------------------- | |
9000 | -- Is_Implemented -- | |
9001 | -------------------- | |
9002 | ||
9003 | function Is_Implemented | |
9004 | (Ifaces_List : Elist_Id; | |
9005 | Iface : Entity_Id) return Boolean | |
9006 | is | |
9007 | Iface_Elmt : Elmt_Id; | |
9008 | ||
9009 | begin | |
9010 | Iface_Elmt := First_Elmt (Ifaces_List); | |
9011 | while Present (Iface_Elmt) loop | |
9012 | if Node (Iface_Elmt) = Iface then | |
9013 | return True; | |
9014 | end if; | |
9015 | ||
9016 | Next_Elmt (Iface_Elmt); | |
9017 | end loop; | |
9018 | ||
9019 | return False; | |
9020 | end Is_Implemented; | |
9021 | ||
9022 | -- Start of processing for Matches_Prefixed_View_Profile | |
9023 | ||
9024 | begin | |
9025 | Iface_Param := First (Iface_Params); | |
9026 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
9027 | ||
9028 | if Is_Access_Type (Iface_Typ) then | |
9029 | Iface_Typ := Designated_Type (Iface_Typ); | |
9030 | end if; | |
9031 | ||
9032 | Prim_Param := First (Prim_Params); | |
9033 | ||
9034 | -- The first parameter of the potentially overridden subprogram | |
9035 | -- must be an interface implemented by Prim. | |
9036 | ||
9037 | if not Is_Interface (Iface_Typ) | |
9038 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
9039 | then | |
9040 | return False; | |
9041 | end if; | |
9042 | ||
9043 | -- The checks on the object parameters are done, move onto the | |
9044 | -- rest of the parameters. | |
9045 | ||
9046 | if not In_Scope then | |
9047 | Prim_Param := Next (Prim_Param); | |
9048 | end if; | |
9049 | ||
9050 | Iface_Param := Next (Iface_Param); | |
9051 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
9052 | Iface_Id := Defining_Identifier (Iface_Param); | |
9053 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
9054 | ||
8aa15e3b JM |
9055 | Prim_Id := Defining_Identifier (Prim_Param); |
9056 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
9057 | ||
15e4986c JM |
9058 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
9059 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
9060 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
9061 | then | |
9062 | Iface_Typ := Designated_Type (Iface_Typ); | |
9063 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
9064 | end if; |
9065 | ||
9066 | -- Case of multiple interface types inside a parameter profile | |
9067 | ||
9068 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
9069 | ||
9070 | -- If the interface type is implemented, then the matching type | |
9071 | -- in the primitive should be the implementing record type. | |
9072 | ||
9073 | if Ekind (Iface_Typ) = E_Record_Type | |
9074 | and then Is_Interface (Iface_Typ) | |
9075 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
9076 | then | |
9077 | if Prim_Typ /= Typ then | |
9078 | return False; | |
9079 | end if; | |
9080 | ||
9081 | -- The two parameters must be both mode and subtype conformant | |
9082 | ||
9083 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
9084 | or else not | |
9085 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
9086 | then | |
9087 | return False; | |
9088 | end if; | |
9089 | ||
9090 | Next (Iface_Param); | |
9091 | Next (Prim_Param); | |
9092 | end loop; | |
9093 | ||
9094 | -- One of the two lists contains more parameters than the other | |
9095 | ||
9096 | if Present (Iface_Param) or else Present (Prim_Param) then | |
9097 | return False; | |
9098 | end if; | |
9099 | ||
9100 | return True; | |
9101 | end Matches_Prefixed_View_Profile; | |
9102 | ||
9103 | -- Start of processing for Check_Synchronized_Overriding | |
9104 | ||
5d37ba92 ES |
9105 | begin |
9106 | Overridden_Subp := Empty; | |
9107 | ||
8aa15e3b JM |
9108 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
9109 | -- primitives internally generated by the frontend; however at this | |
9110 | -- stage predefined primitives are still not fully decorated. As a | |
9111 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 9112 | |
8aa15e3b JM |
9113 | if (Ekind (Def_Id) /= E_Entry |
9114 | and then Ekind (Def_Id) /= E_Function | |
9115 | and then Ekind (Def_Id) /= E_Procedure) | |
9116 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
9117 | then |
9118 | return; | |
9119 | end if; | |
9120 | ||
9121 | -- Search for the concurrent declaration since it contains the list | |
9122 | -- of all implemented interfaces. In this case, the subprogram is | |
9123 | -- declared within the scope of a protected or a task type. | |
9124 | ||
9125 | if Present (Scope (Def_Id)) | |
9126 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
9127 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
9128 | then | |
9129 | Typ := Scope (Def_Id); | |
9130 | In_Scope := True; | |
9131 | ||
8aa15e3b | 9132 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 9133 | -- has no formals. |
8aa15e3b JM |
9134 | |
9135 | elsif No (First_Formal (Def_Id)) then | |
9136 | return; | |
5d37ba92 | 9137 | |
8aa15e3b | 9138 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 9139 | -- concurrent type. |
5d37ba92 | 9140 | |
8aa15e3b JM |
9141 | else |
9142 | Typ := Etype (First_Formal (Def_Id)); | |
9143 | ||
9144 | if Is_Access_Type (Typ) then | |
9145 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
9146 | end if; |
9147 | ||
8aa15e3b JM |
9148 | if Is_Concurrent_Type (Typ) |
9149 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 9150 | then |
5d37ba92 ES |
9151 | In_Scope := False; |
9152 | ||
9153 | -- This case occurs when the concurrent type is declared within | |
9154 | -- a generic unit. As a result the corresponding record has been | |
9155 | -- built and used as the type of the first formal, we just have | |
9156 | -- to retrieve the corresponding concurrent type. | |
9157 | ||
8aa15e3b | 9158 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 9159 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 9160 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 9161 | then |
8aa15e3b | 9162 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
9163 | In_Scope := False; |
9164 | ||
9165 | else | |
9166 | return; | |
9167 | end if; | |
8aa15e3b JM |
9168 | end if; |
9169 | ||
9170 | -- There is no overriding to check if is an inherited operation in a | |
9171 | -- type derivation on for a generic actual. | |
9172 | ||
9173 | Collect_Interfaces (Typ, Ifaces_List); | |
9174 | ||
9175 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
9176 | return; |
9177 | end if; | |
9178 | ||
8aa15e3b JM |
9179 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
9180 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 9181 | |
8aa15e3b JM |
9182 | declare |
9183 | Candidate : Entity_Id := Empty; | |
9184 | Hom : Entity_Id := Empty; | |
8aa15e3b JM |
9185 | Subp : Entity_Id := Empty; |
9186 | ||
9187 | begin | |
4adf3c50 | 9188 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
9189 | -- overridden subprogram that belongs to an implemented |
9190 | -- interface. | |
9191 | ||
9192 | Hom := Current_Entity_In_Scope (Def_Id); | |
9193 | while Present (Hom) loop | |
9194 | Subp := Hom; | |
9195 | ||
15e4986c JM |
9196 | if Subp = Def_Id |
9197 | or else not Is_Overloadable (Subp) | |
9198 | or else not Is_Primitive (Subp) | |
9199 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 9200 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 9201 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 9202 | then |
15e4986c | 9203 | null; |
8aa15e3b | 9204 | |
15e4986c | 9205 | -- Entries and procedures can override abstract or null |
4adf3c50 | 9206 | -- interface procedures. |
8aa15e3b | 9207 | |
15e4986c | 9208 | elsif (Ekind (Def_Id) = E_Procedure |
8fde064e | 9209 | or else Ekind (Def_Id) = E_Entry) |
8aa15e3b | 9210 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
9211 | and then Matches_Prefixed_View_Profile |
9212 | (Parameter_Specifications (Parent (Def_Id)), | |
9213 | Parameter_Specifications (Parent (Subp))) | |
9214 | then | |
9215 | Candidate := Subp; | |
9216 | ||
15e4986c JM |
9217 | -- For an overridden subprogram Subp, check whether the mode |
9218 | -- of its first parameter is correct depending on the kind | |
9219 | -- of synchronized type. | |
8aa15e3b | 9220 | |
15e4986c JM |
9221 | declare |
9222 | Formal : constant Node_Id := First_Formal (Candidate); | |
9223 | ||
9224 | begin | |
9225 | -- In order for an entry or a protected procedure to | |
9226 | -- override, the first parameter of the overridden | |
9227 | -- routine must be of mode "out", "in out" or | |
9228 | -- access-to-variable. | |
9229 | ||
8fde064e | 9230 | if Ekind_In (Candidate, E_Entry, E_Procedure) |
15e4986c JM |
9231 | and then Is_Protected_Type (Typ) |
9232 | and then Ekind (Formal) /= E_In_Out_Parameter | |
9233 | and then Ekind (Formal) /= E_Out_Parameter | |
8fde064e AC |
9234 | and then Nkind (Parameter_Type (Parent (Formal))) /= |
9235 | N_Access_Definition | |
15e4986c JM |
9236 | then |
9237 | null; | |
9238 | ||
9239 | -- All other cases are OK since a task entry or routine | |
9240 | -- does not have a restriction on the mode of the first | |
9241 | -- parameter of the overridden interface routine. | |
9242 | ||
9243 | else | |
9244 | Overridden_Subp := Candidate; | |
9245 | return; | |
9246 | end if; | |
9247 | end; | |
8aa15e3b JM |
9248 | |
9249 | -- Functions can override abstract interface functions | |
9250 | ||
9251 | elsif Ekind (Def_Id) = E_Function | |
9252 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
9253 | and then Matches_Prefixed_View_Profile |
9254 | (Parameter_Specifications (Parent (Def_Id)), | |
9255 | Parameter_Specifications (Parent (Subp))) | |
9256 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
9257 | Etype (Result_Definition (Parent (Subp))) | |
9258 | then | |
273123a4 AC |
9259 | Candidate := Subp; |
9260 | ||
9261 | -- If an inherited subprogram is implemented by a protected | |
9262 | -- function, then the first parameter of the inherited | |
9263 | -- subprogram shall be of mode in, but not an | |
9264 | -- access-to-variable parameter (RM 9.4(11/9) | |
9265 | ||
9266 | if Present (First_Formal (Subp)) | |
9267 | and then Ekind (First_Formal (Subp)) = E_In_Parameter | |
9268 | and then | |
9269 | (not Is_Access_Type (Etype (First_Formal (Subp))) | |
9270 | or else | |
9271 | Is_Access_Constant (Etype (First_Formal (Subp)))) | |
9272 | then | |
9273 | Overridden_Subp := Subp; | |
9274 | return; | |
9275 | end if; | |
8aa15e3b JM |
9276 | end if; |
9277 | ||
9278 | Hom := Homonym (Hom); | |
9279 | end loop; | |
9280 | ||
4adf3c50 AC |
9281 | -- After examining all candidates for overriding, we are left with |
9282 | -- the best match which is a mode incompatible interface routine. | |
8aa15e3b | 9283 | |
273123a4 AC |
9284 | if In_Scope and then Present (Candidate) then |
9285 | Error_Msg_PT (Def_Id, Candidate); | |
5d37ba92 | 9286 | end if; |
8aa15e3b JM |
9287 | |
9288 | Overridden_Subp := Candidate; | |
9289 | return; | |
9290 | end; | |
5d37ba92 ES |
9291 | end Check_Synchronized_Overriding; |
9292 | ||
9293 | ---------------------------- | |
9294 | -- Is_Private_Declaration -- | |
9295 | ---------------------------- | |
9296 | ||
9297 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
9298 | Priv_Decls : List_Id; | |
9299 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
9300 | ||
9301 | begin | |
9302 | if Is_Package_Or_Generic_Package (Current_Scope) | |
9303 | and then In_Private_Part (Current_Scope) | |
9304 | then | |
9305 | Priv_Decls := | |
d12b19fa | 9306 | Private_Declarations (Package_Specification (Current_Scope)); |
5d37ba92 ES |
9307 | |
9308 | return In_Package_Body (Current_Scope) | |
9309 | or else | |
9310 | (Is_List_Member (Decl) | |
a4901c08 | 9311 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 9312 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
9313 | and then not |
9314 | Is_Compilation_Unit | |
9315 | (Defining_Entity (Parent (Decl))) | |
9316 | and then List_Containing (Parent (Parent (Decl))) = | |
9317 | Priv_Decls); | |
5d37ba92 ES |
9318 | else |
9319 | return False; | |
9320 | end if; | |
9321 | end Is_Private_Declaration; | |
996ae0b0 | 9322 | |
2ddc2000 AC |
9323 | -------------------------- |
9324 | -- Is_Overriding_Alias -- | |
9325 | -------------------------- | |
9326 | ||
9327 | function Is_Overriding_Alias | |
9328 | (Old_E : Entity_Id; | |
9329 | New_E : Entity_Id) return Boolean | |
9330 | is | |
9331 | AO : constant Entity_Id := Alias (Old_E); | |
9332 | AN : constant Entity_Id := Alias (New_E); | |
2ddc2000 AC |
9333 | begin |
9334 | return Scope (AO) /= Scope (AN) | |
9335 | or else No (DTC_Entity (AO)) | |
9336 | or else No (DTC_Entity (AN)) | |
9337 | or else DT_Position (AO) = DT_Position (AN); | |
9338 | end Is_Overriding_Alias; | |
9339 | ||
996ae0b0 RK |
9340 | -- Start of processing for New_Overloaded_Entity |
9341 | ||
9342 | begin | |
fbf5a39b AC |
9343 | -- We need to look for an entity that S may override. This must be a |
9344 | -- homonym in the current scope, so we look for the first homonym of | |
9345 | -- S in the current scope as the starting point for the search. | |
9346 | ||
9347 | E := Current_Entity_In_Scope (S); | |
9348 | ||
947430d5 AC |
9349 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
9350 | -- They are directly added to the list of primitive operations of | |
9351 | -- Derived_Type, unless this is a rederivation in the private part | |
9352 | -- of an operation that was already derived in the visible part of | |
9353 | -- the current package. | |
9354 | ||
0791fbe9 | 9355 | if Ada_Version >= Ada_2005 |
947430d5 AC |
9356 | and then Present (Derived_Type) |
9357 | and then Present (Alias (S)) | |
9358 | and then Is_Dispatching_Operation (Alias (S)) | |
9359 | and then Present (Find_Dispatching_Type (Alias (S))) | |
9360 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
9361 | then | |
9362 | -- For private types, when the full-view is processed we propagate to | |
9363 | -- the full view the non-overridden entities whose attribute "alias" | |
9364 | -- references an interface primitive. These entities were added by | |
9365 | -- Derive_Subprograms to ensure that interface primitives are | |
9366 | -- covered. | |
9367 | ||
9368 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
9369 | -- internal entity that links an interface primitive with its | |
9370 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 9371 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
9372 | |
9373 | if Inside_Freezing_Actions = 0 | |
9374 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
9375 | and then In_Private_Part (Current_Scope) | |
9376 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
9377 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
9378 | and then Full_View (Defining_Identifier (Parent (E))) | |
9379 | = Defining_Identifier (Parent (S)) | |
9380 | and then Alias (E) = Alias (S) | |
9381 | then | |
9382 | Check_Operation_From_Private_View (S, E); | |
9383 | Set_Is_Dispatching_Operation (S); | |
9384 | ||
9385 | -- Common case | |
9386 | ||
9387 | else | |
9388 | Enter_Overloaded_Entity (S); | |
9389 | Check_Dispatching_Operation (S, Empty); | |
9390 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
9391 | end if; | |
9392 | ||
9393 | return; | |
9394 | end if; | |
9395 | ||
fbf5a39b AC |
9396 | -- If there is no homonym then this is definitely not overriding |
9397 | ||
996ae0b0 RK |
9398 | if No (E) then |
9399 | Enter_Overloaded_Entity (S); | |
9400 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9401 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 9402 | |
2995860f AC |
9403 | -- If subprogram has an explicit declaration, check whether it has an |
9404 | -- overriding indicator. | |
758c442c | 9405 | |
ec4867fa | 9406 | if Comes_From_Source (S) then |
8aa15e3b | 9407 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
9408 | |
9409 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
9410 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 9411 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
9412 | -- overriding indicator. |
9413 | ||
9414 | if Ada_Version >= Ada_2012 | |
9415 | and then No (Overridden_Subp) | |
9416 | and then Is_Dispatching_Operation (S) | |
038140ed | 9417 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
9418 | then |
9419 | Overridden_Subp := Overridden_Operation (S); | |
9420 | end if; | |
9421 | ||
5d37ba92 ES |
9422 | Check_Overriding_Indicator |
9423 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
241ebe89 HK |
9424 | |
9425 | -- The Ghost policy in effect at the point of declaration of a | |
9426 | -- parent subprogram and an overriding subprogram must match | |
9427 | -- (SPARK RM 6.9(17)). | |
9428 | ||
9429 | Check_Ghost_Overriding (S, Overridden_Subp); | |
758c442c GD |
9430 | end if; |
9431 | ||
fbf5a39b AC |
9432 | -- If there is a homonym that is not overloadable, then we have an |
9433 | -- error, except for the special cases checked explicitly below. | |
9434 | ||
996ae0b0 RK |
9435 | elsif not Is_Overloadable (E) then |
9436 | ||
9437 | -- Check for spurious conflict produced by a subprogram that has the | |
9438 | -- same name as that of the enclosing generic package. The conflict | |
9439 | -- occurs within an instance, between the subprogram and the renaming | |
9440 | -- declaration for the package. After the subprogram, the package | |
9441 | -- renaming declaration becomes hidden. | |
9442 | ||
9443 | if Ekind (E) = E_Package | |
9444 | and then Present (Renamed_Object (E)) | |
9445 | and then Renamed_Object (E) = Current_Scope | |
9446 | and then Nkind (Parent (Renamed_Object (E))) = | |
9447 | N_Package_Specification | |
9448 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
9449 | then | |
9450 | Set_Is_Hidden (E); | |
9451 | Set_Is_Immediately_Visible (E, False); | |
9452 | Enter_Overloaded_Entity (S); | |
9453 | Set_Homonym (S, Homonym (E)); | |
9454 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9455 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
9456 | |
9457 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
9458 | -- declaration. However if it is dispatching, it must appear in the |
9459 | -- dispatch table anyway, because it can be dispatched to even if it | |
9460 | -- cannot be called directly. | |
996ae0b0 | 9461 | |
4adf3c50 | 9462 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
9463 | Set_Scope (S, Current_Scope); |
9464 | ||
9465 | if Is_Dispatching_Operation (Alias (S)) then | |
9466 | Check_Dispatching_Operation (S, Empty); | |
9467 | end if; | |
9468 | ||
9469 | return; | |
9470 | ||
9471 | else | |
9472 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 9473 | |
f3d57416 | 9474 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
9475 | |
9476 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
9477 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
9478 | Error_Msg_N ("\& conflicts with declaration#", S); | |
9479 | else | |
9480 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
9481 | end if; |
9482 | ||
9483 | return; | |
9484 | end if; | |
9485 | ||
fbf5a39b AC |
9486 | -- E exists and is overloadable |
9487 | ||
996ae0b0 | 9488 | else |
8aa15e3b | 9489 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 9490 | |
82c80734 RD |
9491 | -- Loop through E and its homonyms to determine if any of them is |
9492 | -- the candidate for overriding by S. | |
996ae0b0 RK |
9493 | |
9494 | while Present (E) loop | |
fbf5a39b AC |
9495 | |
9496 | -- Definitely not interesting if not in the current scope | |
9497 | ||
996ae0b0 RK |
9498 | if Scope (E) /= Current_Scope then |
9499 | null; | |
9500 | ||
aca90db9 AC |
9501 | -- A function can overload the name of an abstract state. The |
9502 | -- state can be viewed as a function with a profile that cannot | |
9503 | -- be matched by anything. | |
9504 | ||
9505 | elsif Ekind (S) = E_Function | |
9506 | and then Ekind (E) = E_Abstract_State | |
9507 | then | |
9508 | Enter_Overloaded_Entity (S); | |
9509 | return; | |
9510 | ||
2995860f AC |
9511 | -- Ada 2012 (AI05-0165): For internally generated bodies of null |
9512 | -- procedures locate the internally generated spec. We enforce | |
9513 | -- mode conformance since a tagged type may inherit from | |
9514 | -- interfaces several null primitives which differ only in | |
9515 | -- the mode of the formals. | |
25ebc085 AC |
9516 | |
9517 | elsif not Comes_From_Source (S) | |
9518 | and then Is_Null_Procedure (S) | |
9519 | and then not Mode_Conformant (E, S) | |
9520 | then | |
9521 | null; | |
9522 | ||
fbf5a39b AC |
9523 | -- Check if we have type conformance |
9524 | ||
ec4867fa | 9525 | elsif Type_Conformant (E, S) then |
c8ef728f | 9526 | |
82c80734 RD |
9527 | -- If the old and new entities have the same profile and one |
9528 | -- is not the body of the other, then this is an error, unless | |
9529 | -- one of them is implicitly declared. | |
996ae0b0 RK |
9530 | |
9531 | -- There are some cases when both can be implicit, for example | |
9532 | -- when both a literal and a function that overrides it are | |
f3d57416 | 9533 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 9534 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 9535 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 9536 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
9537 | -- the former, and the literal is always the former. In the |
9538 | -- odd case where both are derived operations declared at the | |
9539 | -- same point, both operations should be declared, and in that | |
9540 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
9541 | -- part. This can only occur for certain obscure cases in |
9542 | -- instances, when an operation on a type derived from a formal | |
9543 | -- private type does not override a homograph inherited from | |
9544 | -- the actual. In subsequent derivations of such a type, the | |
9545 | -- DT positions of these operations remain distinct, if they | |
9546 | -- have been set. | |
996ae0b0 RK |
9547 | |
9548 | if Present (Alias (S)) | |
9549 | and then (No (Alias (E)) | |
9550 | or else Comes_From_Source (E) | |
2ddc2000 | 9551 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
9552 | or else |
9553 | (Is_Dispatching_Operation (E) | |
84c0a895 | 9554 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 9555 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 9556 | then |
82c80734 RD |
9557 | -- When an derived operation is overloaded it may be due to |
9558 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
9559 | -- re-inherits. It has to be dealt with. |
9560 | ||
e660dbf7 | 9561 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
9562 | and then In_Private_Part (Current_Scope) |
9563 | then | |
9564 | Check_Operation_From_Private_View (S, E); | |
9565 | end if; | |
9566 | ||
038140ed AC |
9567 | -- In any case the implicit operation remains hidden by the |
9568 | -- existing declaration, which is overriding. Indicate that | |
9569 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 9570 | |
038140ed | 9571 | if Present (Alias (S)) then |
039538bc AC |
9572 | Set_Overridden_Operation (E, Alias (S)); |
9573 | Inherit_Subprogram_Contract (E, Alias (S)); | |
9574 | ||
038140ed | 9575 | else |
039538bc AC |
9576 | Set_Overridden_Operation (E, S); |
9577 | Inherit_Subprogram_Contract (E, S); | |
038140ed | 9578 | end if; |
758c442c GD |
9579 | |
9580 | if Comes_From_Source (E) then | |
5d37ba92 | 9581 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
241ebe89 HK |
9582 | |
9583 | -- The Ghost policy in effect at the point of declaration | |
9584 | -- of a parent subprogram and an overriding subprogram | |
9585 | -- must match (SPARK RM 6.9(17)). | |
9586 | ||
9587 | Check_Ghost_Overriding (E, S); | |
758c442c GD |
9588 | end if; |
9589 | ||
996ae0b0 RK |
9590 | return; |
9591 | ||
26a43556 AC |
9592 | -- Within an instance, the renaming declarations for actual |
9593 | -- subprograms may become ambiguous, but they do not hide each | |
9594 | -- other. | |
996ae0b0 RK |
9595 | |
9596 | elsif Ekind (E) /= E_Entry | |
9597 | and then not Comes_From_Source (E) | |
9598 | and then not Is_Generic_Instance (E) | |
9599 | and then (Present (Alias (E)) | |
9600 | or else Is_Intrinsic_Subprogram (E)) | |
9601 | and then (not In_Instance | |
9602 | or else No (Parent (E)) | |
9603 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 9604 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 9605 | then |
26a43556 AC |
9606 | -- A subprogram child unit is not allowed to override an |
9607 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
9608 | |
9609 | if Is_Child_Unit (S) then | |
9610 | Error_Msg_N | |
9611 | ("child unit overrides inherited subprogram in parent", | |
9612 | S); | |
9613 | return; | |
9614 | end if; | |
9615 | ||
9616 | if Is_Non_Overriding_Operation (E, S) then | |
9617 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 9618 | |
c8ef728f | 9619 | if No (Derived_Type) |
996ae0b0 RK |
9620 | or else Is_Tagged_Type (Derived_Type) |
9621 | then | |
9622 | Check_Dispatching_Operation (S, Empty); | |
9623 | end if; | |
9624 | ||
9625 | return; | |
9626 | end if; | |
9627 | ||
9628 | -- E is a derived operation or an internal operator which | |
9629 | -- is being overridden. Remove E from further visibility. | |
9630 | -- Furthermore, if E is a dispatching operation, it must be | |
9631 | -- replaced in the list of primitive operations of its type | |
9632 | -- (see Override_Dispatching_Operation). | |
9633 | ||
ec4867fa | 9634 | Overridden_Subp := E; |
758c442c | 9635 | |
996ae0b0 RK |
9636 | declare |
9637 | Prev : Entity_Id; | |
9638 | ||
9639 | begin | |
9640 | Prev := First_Entity (Current_Scope); | |
8fde064e | 9641 | while Present (Prev) and then Next_Entity (Prev) /= E loop |
996ae0b0 RK |
9642 | Next_Entity (Prev); |
9643 | end loop; | |
9644 | ||
9645 | -- It is possible for E to be in the current scope and | |
9646 | -- yet not in the entity chain. This can only occur in a | |
9647 | -- generic context where E is an implicit concatenation | |
9648 | -- in the formal part, because in a generic body the | |
9649 | -- entity chain starts with the formals. | |
9650 | ||
948ed277 AC |
9651 | -- In GNATprove mode, a wrapper for an operation with |
9652 | -- axiomatization may be a homonym of another declaration | |
9653 | -- for an actual subprogram (needs refinement ???). | |
9654 | ||
9655 | if No (Prev) then | |
9656 | if In_Instance | |
9657 | and then GNATprove_Mode | |
9658 | and then | |
9659 | Nkind (Original_Node (Unit_Declaration_Node (S))) = | |
9660 | N_Subprogram_Renaming_Declaration | |
9661 | then | |
9662 | return; | |
9663 | else | |
9664 | pragma Assert (Chars (E) = Name_Op_Concat); | |
9665 | null; | |
9666 | end if; | |
9667 | end if; | |
996ae0b0 RK |
9668 | |
9669 | -- E must be removed both from the entity_list of the | |
948ed277 | 9670 | -- current scope, and from the visibility chain. |
996ae0b0 RK |
9671 | |
9672 | if Debug_Flag_E then | |
9673 | Write_Str ("Override implicit operation "); | |
9674 | Write_Int (Int (E)); | |
9675 | Write_Eol; | |
9676 | end if; | |
9677 | ||
9678 | -- If E is a predefined concatenation, it stands for four | |
9679 | -- different operations. As a result, a single explicit | |
9680 | -- declaration does not hide it. In a possible ambiguous | |
9681 | -- situation, Disambiguate chooses the user-defined op, | |
9682 | -- so it is correct to retain the previous internal one. | |
9683 | ||
9684 | if Chars (E) /= Name_Op_Concat | |
9685 | or else Ekind (E) /= E_Operator | |
9686 | then | |
9687 | -- For nondispatching derived operations that are | |
9688 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
9689 | -- part of a package, we retain the derived subprogram |
9690 | -- but mark it as not immediately visible. If the | |
9691 | -- derived operation was declared in the visible part | |
9692 | -- then this ensures that it will still be visible | |
9693 | -- outside the package with the proper signature | |
9694 | -- (calls from outside must also be directed to this | |
9695 | -- version rather than the overriding one, unlike the | |
9696 | -- dispatching case). Calls from inside the package | |
9697 | -- will still resolve to the overriding subprogram | |
9698 | -- since the derived one is marked as not visible | |
9699 | -- within the package. | |
996ae0b0 RK |
9700 | |
9701 | -- If the private operation is dispatching, we achieve | |
9702 | -- the overriding by keeping the implicit operation | |
9865d858 | 9703 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
9704 | -- this fashion the proper body is executed in all |
9705 | -- cases, but the original signature is used outside | |
9706 | -- of the package. | |
9707 | ||
9708 | -- If the overriding is not in the private part, we | |
9709 | -- remove the implicit operation altogether. | |
9710 | ||
9711 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
9712 | if not Is_Dispatching_Operation (E) then |
9713 | Set_Is_Immediately_Visible (E, False); | |
9714 | else | |
e895b435 | 9715 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 9716 | -- so nothing else needs to be done here. |
996ae0b0 RK |
9717 | |
9718 | null; | |
9719 | end if; | |
996ae0b0 | 9720 | |
fbf5a39b AC |
9721 | else |
9722 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
9723 | |
9724 | if E = Current_Entity (E) then | |
9725 | Prev_Vis := Empty; | |
9726 | else | |
9727 | Prev_Vis := Current_Entity (E); | |
9728 | while Homonym (Prev_Vis) /= E loop | |
9729 | Prev_Vis := Homonym (Prev_Vis); | |
9730 | end loop; | |
9731 | end if; | |
9732 | ||
9733 | if Prev_Vis /= Empty then | |
9734 | ||
9735 | -- Skip E in the visibility chain | |
9736 | ||
9737 | Set_Homonym (Prev_Vis, Homonym (E)); | |
9738 | ||
9739 | else | |
9740 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
9741 | end if; | |
9742 | ||
9743 | Set_Next_Entity (Prev, Next_Entity (E)); | |
9744 | ||
9745 | if No (Next_Entity (Prev)) then | |
9746 | Set_Last_Entity (Current_Scope, Prev); | |
9747 | end if; | |
996ae0b0 RK |
9748 | end if; |
9749 | end if; | |
9750 | ||
9751 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
9752 | |
9753 | -- For entities generated by Derive_Subprograms the | |
9754 | -- overridden operation is the inherited primitive | |
9755 | -- (which is available through the attribute alias). | |
9756 | ||
9757 | if not (Comes_From_Source (E)) | |
9758 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
9759 | and then Find_Dispatching_Type (E) = |
9760 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
9761 | and then Present (Alias (E)) |
9762 | and then Comes_From_Source (Alias (E)) | |
9763 | then | |
039538bc AC |
9764 | Set_Overridden_Operation (S, Alias (E)); |
9765 | Inherit_Subprogram_Contract (S, Alias (E)); | |
2fe829ae | 9766 | |
6320f5e1 AC |
9767 | -- Normal case of setting entity as overridden |
9768 | ||
9769 | -- Note: Static_Initialization and Overridden_Operation | |
9770 | -- attributes use the same field in subprogram entities. | |
9771 | -- Static_Initialization is only defined for internal | |
9772 | -- initialization procedures, where Overridden_Operation | |
9773 | -- is irrelevant. Therefore the setting of this attribute | |
9774 | -- must check whether the target is an init_proc. | |
9775 | ||
2fe829ae | 9776 | elsif not Is_Init_Proc (S) then |
039538bc AC |
9777 | Set_Overridden_Operation (S, E); |
9778 | Inherit_Subprogram_Contract (S, E); | |
1c1289e7 AC |
9779 | end if; |
9780 | ||
5d37ba92 | 9781 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 9782 | |
241ebe89 HK |
9783 | -- The Ghost policy in effect at the point of declaration |
9784 | -- of a parent subprogram and an overriding subprogram | |
9785 | -- must match (SPARK RM 6.9(17)). | |
9786 | ||
9787 | Check_Ghost_Overriding (S, E); | |
9788 | ||
fc53fe76 | 9789 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
9790 | -- expanded to override an inherited null procedure, or a |
9791 | -- predefined dispatching primitive then indicate that E | |
038140ed | 9792 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
9793 | |
9794 | if Comes_From_Source (S) | |
9795 | or else | |
9796 | (Present (Parent (S)) | |
9797 | and then | |
9798 | Nkind (Parent (S)) = N_Procedure_Specification | |
9799 | and then | |
9800 | Null_Present (Parent (S))) | |
38ef8ebe AC |
9801 | or else |
9802 | (Present (Alias (E)) | |
f16e8df9 RD |
9803 | and then |
9804 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 9805 | then |
c8ef728f | 9806 | if Present (Alias (E)) then |
039538bc AC |
9807 | Set_Overridden_Operation (S, Alias (E)); |
9808 | Inherit_Subprogram_Contract (S, Alias (E)); | |
41251c60 JM |
9809 | end if; |
9810 | end if; | |
9811 | ||
996ae0b0 | 9812 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 9813 | |
82c80734 | 9814 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 9815 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
9816 | |
9817 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
9818 | Check_Dispatching_Operation (S, E); |
9819 | ||
996ae0b0 RK |
9820 | else |
9821 | Check_Dispatching_Operation (S, Empty); | |
9822 | end if; | |
9823 | ||
5d37ba92 ES |
9824 | Check_For_Primitive_Subprogram |
9825 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
9826 | goto Check_Inequality; |
9827 | end; | |
9828 | ||
9829 | -- Apparent redeclarations in instances can occur when two | |
9830 | -- formal types get the same actual type. The subprograms in | |
9831 | -- in the instance are legal, even if not callable from the | |
9832 | -- outside. Calls from within are disambiguated elsewhere. | |
9833 | -- For dispatching operations in the visible part, the usual | |
9834 | -- rules apply, and operations with the same profile are not | |
9835 | -- legal (B830001). | |
9836 | ||
9837 | elsif (In_Instance_Visible_Part | |
9838 | and then not Is_Dispatching_Operation (E)) | |
9839 | or else In_Instance_Not_Visible | |
9840 | then | |
9841 | null; | |
9842 | ||
9843 | -- Here we have a real error (identical profile) | |
9844 | ||
9845 | else | |
9846 | Error_Msg_Sloc := Sloc (E); | |
9847 | ||
9848 | -- Avoid cascaded errors if the entity appears in | |
9849 | -- subsequent calls. | |
9850 | ||
9851 | Set_Scope (S, Current_Scope); | |
9852 | ||
5d37ba92 ES |
9853 | -- Generate error, with extra useful warning for the case |
9854 | -- of a generic instance with no completion. | |
996ae0b0 RK |
9855 | |
9856 | if Is_Generic_Instance (S) | |
9857 | and then not Has_Completion (E) | |
9858 | then | |
9859 | Error_Msg_N | |
5d37ba92 ES |
9860 | ("instantiation cannot provide body for&", S); |
9861 | Error_Msg_N ("\& conflicts with declaration#", S); | |
9862 | else | |
9863 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
9864 | end if; |
9865 | ||
9866 | return; | |
9867 | end if; | |
9868 | ||
9869 | else | |
c8ef728f ES |
9870 | -- If one subprogram has an access parameter and the other |
9871 | -- a parameter of an access type, calls to either might be | |
9872 | -- ambiguous. Verify that parameters match except for the | |
9873 | -- access parameter. | |
9874 | ||
9875 | if May_Hide_Profile then | |
9876 | declare | |
ec4867fa ES |
9877 | F1 : Entity_Id; |
9878 | F2 : Entity_Id; | |
8dbd1460 | 9879 | |
c8ef728f ES |
9880 | begin |
9881 | F1 := First_Formal (S); | |
9882 | F2 := First_Formal (E); | |
9883 | while Present (F1) and then Present (F2) loop | |
9884 | if Is_Access_Type (Etype (F1)) then | |
9885 | if not Is_Access_Type (Etype (F2)) | |
9886 | or else not Conforming_Types | |
9887 | (Designated_Type (Etype (F1)), | |
9888 | Designated_Type (Etype (F2)), | |
9889 | Type_Conformant) | |
9890 | then | |
9891 | May_Hide_Profile := False; | |
9892 | end if; | |
9893 | ||
9894 | elsif | |
9895 | not Conforming_Types | |
9896 | (Etype (F1), Etype (F2), Type_Conformant) | |
9897 | then | |
9898 | May_Hide_Profile := False; | |
9899 | end if; | |
9900 | ||
9901 | Next_Formal (F1); | |
9902 | Next_Formal (F2); | |
9903 | end loop; | |
9904 | ||
9905 | if May_Hide_Profile | |
9906 | and then No (F1) | |
9907 | and then No (F2) | |
9908 | then | |
dbfeb4fa | 9909 | Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
c8ef728f ES |
9910 | end if; |
9911 | end; | |
9912 | end if; | |
996ae0b0 RK |
9913 | end if; |
9914 | ||
996ae0b0 RK |
9915 | E := Homonym (E); |
9916 | end loop; | |
9917 | ||
9918 | -- On exit, we know that S is a new entity | |
9919 | ||
9920 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
9921 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
9922 | Check_Overriding_Indicator | |
9923 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 9924 | |
241ebe89 HK |
9925 | -- The Ghost policy in effect at the point of declaration of a parent |
9926 | -- subprogram and an overriding subprogram must match | |
9927 | -- (SPARK RM 6.9(17)). | |
9928 | ||
9929 | Check_Ghost_Overriding (S, Overridden_Subp); | |
9930 | ||
c4d67e2d | 9931 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 9932 | |
c4d67e2d AC |
9933 | if Nkind (S) /= N_Defining_Operator_Symbol then |
9934 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
ce5ba43a | 9935 | Check_SPARK_05_Restriction |
c4d67e2d AC |
9936 | ("overloading not allowed with entity#", S); |
9937 | end if; | |
8ed68165 | 9938 | |
82c80734 RD |
9939 | -- If S is a derived operation for an untagged type then by |
9940 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
9941 | -- operation was dispatching), so Check_Dispatching_Operation is not |
9942 | -- called in that case. | |
996ae0b0 | 9943 | |
c8ef728f | 9944 | if No (Derived_Type) |
996ae0b0 RK |
9945 | or else Is_Tagged_Type (Derived_Type) |
9946 | then | |
9947 | Check_Dispatching_Operation (S, Empty); | |
9948 | end if; | |
9949 | end if; | |
9950 | ||
82c80734 RD |
9951 | -- If this is a user-defined equality operator that is not a derived |
9952 | -- subprogram, create the corresponding inequality. If the operation is | |
9953 | -- dispatching, the expansion is done elsewhere, and we do not create | |
9954 | -- an explicit inequality operation. | |
996ae0b0 RK |
9955 | |
9956 | <<Check_Inequality>> | |
9957 | if Chars (S) = Name_Op_Eq | |
9958 | and then Etype (S) = Standard_Boolean | |
9959 | and then Present (Parent (S)) | |
9960 | and then not Is_Dispatching_Operation (S) | |
9961 | then | |
9962 | Make_Inequality_Operator (S); | |
b2834fbd | 9963 | Check_Untagged_Equality (S); |
996ae0b0 | 9964 | end if; |
996ae0b0 RK |
9965 | end New_Overloaded_Entity; |
9966 | ||
9967 | --------------------- | |
9968 | -- Process_Formals -- | |
9969 | --------------------- | |
9970 | ||
9971 | procedure Process_Formals | |
07fc65c4 | 9972 | (T : List_Id; |
996ae0b0 RK |
9973 | Related_Nod : Node_Id) |
9974 | is | |
7b56a91b | 9975 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
950d217a AC |
9976 | -- Determine whether an access type designates a type coming from a |
9977 | -- limited view. | |
9978 | ||
07fc65c4 | 9979 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
9980 | -- Check whether the default has a class-wide type. After analysis the |
9981 | -- default has the type of the formal, so we must also check explicitly | |
9982 | -- for an access attribute. | |
07fc65c4 | 9983 | |
7b56a91b AC |
9984 | ---------------------------------- |
9985 | -- Designates_From_Limited_With -- | |
9986 | ---------------------------------- | |
950d217a | 9987 | |
7b56a91b | 9988 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
950d217a AC |
9989 | Desig : Entity_Id := Typ; |
9990 | ||
9991 | begin | |
9992 | if Is_Access_Type (Desig) then | |
9993 | Desig := Directly_Designated_Type (Desig); | |
9994 | end if; | |
9995 | ||
9996 | if Is_Class_Wide_Type (Desig) then | |
9997 | Desig := Root_Type (Desig); | |
9998 | end if; | |
9999 | ||
10000 | return | |
7b56a91b AC |
10001 | Ekind (Desig) = E_Incomplete_Type |
10002 | and then From_Limited_With (Desig); | |
10003 | end Designates_From_Limited_With; | |
950d217a | 10004 | |
07fc65c4 GB |
10005 | --------------------------- |
10006 | -- Is_Class_Wide_Default -- | |
10007 | --------------------------- | |
10008 | ||
10009 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
10010 | begin | |
10011 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
10012 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
10013 | and then Attribute_Name (D) = Name_Access |
10014 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
10015 | end Is_Class_Wide_Default; |
10016 | ||
847d950d HK |
10017 | -- Local variables |
10018 | ||
10019 | Context : constant Node_Id := Parent (Parent (T)); | |
10020 | Default : Node_Id; | |
10021 | Formal : Entity_Id; | |
10022 | Formal_Type : Entity_Id; | |
10023 | Param_Spec : Node_Id; | |
10024 | Ptype : Entity_Id; | |
10025 | ||
10026 | Num_Out_Params : Nat := 0; | |
10027 | First_Out_Param : Entity_Id := Empty; | |
10028 | -- Used for setting Is_Only_Out_Parameter | |
10029 | ||
07fc65c4 GB |
10030 | -- Start of processing for Process_Formals |
10031 | ||
996ae0b0 RK |
10032 | begin |
10033 | -- In order to prevent premature use of the formals in the same formal | |
10034 | -- part, the Ekind is left undefined until all default expressions are | |
10035 | -- analyzed. The Ekind is established in a separate loop at the end. | |
10036 | ||
10037 | Param_Spec := First (T); | |
996ae0b0 | 10038 | while Present (Param_Spec) loop |
996ae0b0 | 10039 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 10040 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
10041 | Enter_Name (Formal); |
10042 | ||
10043 | -- Case of ordinary parameters | |
10044 | ||
10045 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
10046 | Find_Type (Parameter_Type (Param_Spec)); | |
10047 | Ptype := Parameter_Type (Param_Spec); | |
10048 | ||
10049 | if Ptype = Error then | |
10050 | goto Continue; | |
10051 | end if; | |
10052 | ||
10053 | Formal_Type := Entity (Ptype); | |
10054 | ||
ec4867fa ES |
10055 | if Is_Incomplete_Type (Formal_Type) |
10056 | or else | |
10057 | (Is_Class_Wide_Type (Formal_Type) | |
8fde064e | 10058 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
996ae0b0 | 10059 | then |
93bcda23 AC |
10060 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
10061 | -- primitive operations, as long as their completion is | |
10062 | -- in the same declarative part. If in the private part | |
10063 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
10064 | -- Check is done on package exit. For access to subprograms, |
10065 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 10066 | |
6eddd7b4 AC |
10067 | -- Ada 2012: tagged incomplete types are allowed as generic |
10068 | -- formal types. They do not introduce dependencies and the | |
10069 | -- corresponding generic subprogram does not have a delayed | |
5b6f12c7 AC |
10070 | -- freeze, because it does not need a freeze node. However, |
10071 | -- it is still the case that untagged incomplete types cannot | |
10072 | -- be Taft-amendment types and must be completed in private | |
10073 | -- part, so the subprogram must appear in the list of private | |
a0a10853 AC |
10074 | -- dependents of the type. If the type is class-wide, it is |
10075 | -- not a primitive, but the freezing of the subprogram must | |
10076 | -- also be delayed to force the creation of a freeze node. | |
5b6f12c7 AC |
10077 | |
10078 | if Is_Tagged_Type (Formal_Type) | |
b973629e | 10079 | or else (Ada_Version >= Ada_2012 |
1ebc2612 AC |
10080 | and then not From_Limited_With (Formal_Type) |
10081 | and then not Is_Generic_Type (Formal_Type)) | |
5b6f12c7 | 10082 | then |
93bcda23 | 10083 | if Ekind (Scope (Current_Scope)) = E_Package |
6eddd7b4 | 10084 | and then not Is_Generic_Type (Formal_Type) |
93bcda23 | 10085 | then |
cec29135 ES |
10086 | if not Nkind_In |
10087 | (Parent (T), N_Access_Function_Definition, | |
10088 | N_Access_Procedure_Definition) | |
10089 | then | |
66371f94 AC |
10090 | -- A limited view has no private dependents |
10091 | ||
10092 | if not Is_Class_Wide_Type (Formal_Type) | |
10093 | and then not From_Limited_With (Formal_Type) | |
10094 | then | |
a0a10853 | 10095 | Append_Elmt (Current_Scope, |
66371f94 | 10096 | Private_Dependents (Base_Type (Formal_Type))); |
a0a10853 | 10097 | end if; |
4637729f AC |
10098 | |
10099 | -- Freezing is delayed to ensure that Register_Prim | |
10100 | -- will get called for this operation, which is needed | |
10101 | -- in cases where static dispatch tables aren't built. | |
10102 | -- (Note that the same is done for controlling access | |
10103 | -- parameter cases in function Access_Definition.) | |
10104 | ||
13fa2acb AC |
10105 | if not Is_Thunk (Current_Scope) then |
10106 | Set_Has_Delayed_Freeze (Current_Scope); | |
10107 | end if; | |
cec29135 | 10108 | end if; |
93bcda23 | 10109 | end if; |
fbf5a39b | 10110 | |
800621e0 RD |
10111 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
10112 | N_Access_Procedure_Definition) | |
996ae0b0 | 10113 | then |
dd386db0 AC |
10114 | -- AI05-0151: Tagged incomplete types are allowed in all |
10115 | -- formal parts. Untagged incomplete types are not allowed | |
b973629e AC |
10116 | -- in bodies. Limited views of either kind are not allowed |
10117 | -- if there is no place at which the non-limited view can | |
10118 | -- become available. | |
a18e3d62 | 10119 | |
1ebc2612 AC |
10120 | -- Incomplete formal untagged types are not allowed in |
10121 | -- subprogram bodies (but are legal in their declarations). | |
c8d3b4ff AC |
10122 | -- This excludes bodies created for null procedures, which |
10123 | -- are basic declarations. | |
1ebc2612 AC |
10124 | |
10125 | if Is_Generic_Type (Formal_Type) | |
10126 | and then not Is_Tagged_Type (Formal_Type) | |
10127 | and then Nkind (Parent (Related_Nod)) = N_Subprogram_Body | |
10128 | then | |
10129 | Error_Msg_N | |
10130 | ("invalid use of formal incomplete type", Param_Spec); | |
dd386db0 | 10131 | |
1ebc2612 | 10132 | elsif Ada_Version >= Ada_2012 then |
b973629e AC |
10133 | if Is_Tagged_Type (Formal_Type) |
10134 | and then (not From_Limited_With (Formal_Type) | |
10135 | or else not In_Package_Body) | |
10136 | then | |
dd386db0 AC |
10137 | null; |
10138 | ||
c8d3b4ff AC |
10139 | elsif Nkind_In (Context, N_Accept_Statement, |
10140 | N_Accept_Alternative, | |
10141 | N_Entry_Body) | |
10142 | or else (Nkind (Context) = N_Subprogram_Body | |
10143 | and then Comes_From_Source (Context)) | |
dd386db0 AC |
10144 | then |
10145 | Error_Msg_NE | |
c8d3b4ff | 10146 | ("invalid use of untagged incomplete type &", |
0f1a6a0b | 10147 | Ptype, Formal_Type); |
dd386db0 AC |
10148 | end if; |
10149 | ||
10150 | else | |
10151 | Error_Msg_NE | |
10152 | ("invalid use of incomplete type&", | |
0f1a6a0b | 10153 | Param_Spec, Formal_Type); |
dd386db0 AC |
10154 | |
10155 | -- Further checks on the legality of incomplete types | |
10156 | -- in formal parts are delayed until the freeze point | |
10157 | -- of the enclosing subprogram or access to subprogram. | |
10158 | end if; | |
996ae0b0 RK |
10159 | end if; |
10160 | ||
10161 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
10162 | Error_Msg_NE |
10163 | ("premature use of&", | |
10164 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
10165 | end if; |
10166 | ||
fecbd779 AC |
10167 | -- Ada 2012 (AI-142): Handle aliased parameters |
10168 | ||
10169 | if Ada_Version >= Ada_2012 | |
10170 | and then Aliased_Present (Param_Spec) | |
10171 | then | |
10172 | Set_Is_Aliased (Formal); | |
10173 | end if; | |
10174 | ||
0ab80019 | 10175 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 10176 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
10177 | -- formal in the enclosing scope. Finally, replace the parameter |
10178 | -- type of the formal with the internal subtype. | |
7324bf49 | 10179 | |
0791fbe9 | 10180 | if Ada_Version >= Ada_2005 |
41251c60 | 10181 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 10182 | then |
ec4867fa | 10183 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 10184 | Error_Msg_N |
0a36105d JM |
10185 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
10186 | ||
ec4867fa ES |
10187 | else |
10188 | if Can_Never_Be_Null (Formal_Type) | |
10189 | and then Comes_From_Source (Related_Nod) | |
10190 | then | |
ed2233dc | 10191 | Error_Msg_NE |
0a36105d | 10192 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 10193 | Param_Spec, Formal_Type); |
ec4867fa | 10194 | end if; |
41251c60 | 10195 | |
ec4867fa ES |
10196 | Formal_Type := |
10197 | Create_Null_Excluding_Itype | |
10198 | (T => Formal_Type, | |
10199 | Related_Nod => Related_Nod, | |
10200 | Scope_Id => Scope (Current_Scope)); | |
0a36105d | 10201 | |
fcf848c4 AC |
10202 | -- If the designated type of the itype is an itype that is |
10203 | -- not frozen yet, we set the Has_Delayed_Freeze attribute | |
10204 | -- on the access subtype, to prevent order-of-elaboration | |
10205 | -- issues in the backend. | |
0a36105d JM |
10206 | |
10207 | -- Example: | |
10208 | -- type T is access procedure; | |
10209 | -- procedure Op (O : not null T); | |
10210 | ||
fcf848c4 AC |
10211 | if Is_Itype (Directly_Designated_Type (Formal_Type)) |
10212 | and then | |
10213 | not Is_Frozen (Directly_Designated_Type (Formal_Type)) | |
10214 | then | |
0a36105d JM |
10215 | Set_Has_Delayed_Freeze (Formal_Type); |
10216 | end if; | |
ec4867fa | 10217 | end if; |
7324bf49 AC |
10218 | end if; |
10219 | ||
996ae0b0 RK |
10220 | -- An access formal type |
10221 | ||
10222 | else | |
10223 | Formal_Type := | |
10224 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 10225 | |
f937473f RD |
10226 | -- No need to continue if we already notified errors |
10227 | ||
10228 | if not Present (Formal_Type) then | |
10229 | return; | |
10230 | end if; | |
10231 | ||
0ab80019 | 10232 | -- Ada 2005 (AI-254) |
7324bf49 | 10233 | |
af4b9434 AC |
10234 | declare |
10235 | AD : constant Node_Id := | |
10236 | Access_To_Subprogram_Definition | |
10237 | (Parameter_Type (Param_Spec)); | |
10238 | begin | |
10239 | if Present (AD) and then Protected_Present (AD) then | |
10240 | Formal_Type := | |
10241 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 10242 | (Param_Spec); |
af4b9434 AC |
10243 | end if; |
10244 | end; | |
996ae0b0 RK |
10245 | end if; |
10246 | ||
10247 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 10248 | |
fecbd779 AC |
10249 | -- Deal with default expression if present |
10250 | ||
fbf5a39b | 10251 | Default := Expression (Param_Spec); |
996ae0b0 RK |
10252 | |
10253 | if Present (Default) then | |
ce5ba43a | 10254 | Check_SPARK_05_Restriction |
fe5d3068 | 10255 | ("default expression is not allowed", Default); |
38171f43 | 10256 | |
996ae0b0 | 10257 | if Out_Present (Param_Spec) then |
ed2233dc | 10258 | Error_Msg_N |
996ae0b0 RK |
10259 | ("default initialization only allowed for IN parameters", |
10260 | Param_Spec); | |
10261 | end if; | |
10262 | ||
10263 | -- Do the special preanalysis of the expression (see section on | |
10264 | -- "Handling of Default Expressions" in the spec of package Sem). | |
10265 | ||
21d27997 | 10266 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 10267 | |
f29b857f ES |
10268 | -- An access to constant cannot be the default for |
10269 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
10270 | |
10271 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
10272 | and then not Is_Access_Constant (Formal_Type) | |
10273 | and then Is_Access_Type (Etype (Default)) | |
10274 | and then Is_Access_Constant (Etype (Default)) | |
10275 | then | |
f29b857f | 10276 | Error_Msg_N |
84c0a895 AC |
10277 | ("formal that is access to variable cannot be initialized " |
10278 | & "with an access-to-constant expression", Default); | |
2eb160f2 ST |
10279 | end if; |
10280 | ||
d8db0bca JM |
10281 | -- Check that the designated type of an access parameter's default |
10282 | -- is not a class-wide type unless the parameter's designated type | |
10283 | -- is also class-wide. | |
996ae0b0 RK |
10284 | |
10285 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
7b56a91b | 10286 | and then not Designates_From_Limited_With (Formal_Type) |
07fc65c4 | 10287 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
10288 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
10289 | then | |
07fc65c4 GB |
10290 | Error_Msg_N |
10291 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 10292 | end if; |
4755cce9 JM |
10293 | |
10294 | -- Check incorrect use of dynamically tagged expressions | |
10295 | ||
10296 | if Is_Tagged_Type (Formal_Type) then | |
10297 | Check_Dynamically_Tagged_Expression | |
10298 | (Expr => Default, | |
10299 | Typ => Formal_Type, | |
10300 | Related_Nod => Default); | |
10301 | end if; | |
996ae0b0 RK |
10302 | end if; |
10303 | ||
41251c60 JM |
10304 | -- Ada 2005 (AI-231): Static checks |
10305 | ||
0791fbe9 | 10306 | if Ada_Version >= Ada_2005 |
41251c60 JM |
10307 | and then Is_Access_Type (Etype (Formal)) |
10308 | and then Can_Never_Be_Null (Etype (Formal)) | |
10309 | then | |
10310 | Null_Exclusion_Static_Checks (Param_Spec); | |
10311 | end if; | |
10312 | ||
847d950d HK |
10313 | -- The following checks are relevant only when SPARK_Mode is on as |
10314 | -- these are not standard Ada legality rules. | |
6c3c671e | 10315 | |
ea26c8e4 HK |
10316 | if SPARK_Mode = On then |
10317 | if Ekind_In (Scope (Formal), E_Function, E_Generic_Function) then | |
f1bd0415 | 10318 | |
ea26c8e4 HK |
10319 | -- A function cannot have a parameter of mode IN OUT or OUT |
10320 | -- (SPARK RM 6.1). | |
f1bd0415 | 10321 | |
ea26c8e4 HK |
10322 | if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then |
10323 | Error_Msg_N | |
10324 | ("function cannot have parameter of mode `OUT` or " | |
10325 | & "`IN OUT`", Formal); | |
ea26c8e4 HK |
10326 | end if; |
10327 | ||
d780e54f AC |
10328 | -- A procedure cannot have an effectively volatile formal |
10329 | -- parameter of mode IN because it behaves as a constant | |
10330 | -- (SPARK RM 7.1.3(6)). | |
ea26c8e4 HK |
10331 | |
10332 | elsif Ekind (Scope (Formal)) = E_Procedure | |
10333 | and then Ekind (Formal) = E_In_Parameter | |
d780e54f | 10334 | and then Is_Effectively_Volatile (Formal) |
ea26c8e4 | 10335 | then |
f1bd0415 | 10336 | Error_Msg_N |
ea26c8e4 | 10337 | ("formal parameter of mode `IN` cannot be volatile", Formal); |
f1bd0415 | 10338 | end if; |
6c3c671e AC |
10339 | end if; |
10340 | ||
996ae0b0 RK |
10341 | <<Continue>> |
10342 | Next (Param_Spec); | |
10343 | end loop; | |
10344 | ||
82c80734 RD |
10345 | -- If this is the formal part of a function specification, analyze the |
10346 | -- subtype mark in the context where the formals are visible but not | |
10347 | -- yet usable, and may hide outer homographs. | |
10348 | ||
10349 | if Nkind (Related_Nod) = N_Function_Specification then | |
10350 | Analyze_Return_Type (Related_Nod); | |
10351 | end if; | |
10352 | ||
996ae0b0 RK |
10353 | -- Now set the kind (mode) of each formal |
10354 | ||
10355 | Param_Spec := First (T); | |
996ae0b0 RK |
10356 | while Present (Param_Spec) loop |
10357 | Formal := Defining_Identifier (Param_Spec); | |
10358 | Set_Formal_Mode (Formal); | |
10359 | ||
10360 | if Ekind (Formal) = E_In_Parameter then | |
10361 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
10362 | ||
10363 | if Present (Expression (Param_Spec)) then | |
10364 | Default := Expression (Param_Spec); | |
10365 | ||
10366 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
10367 | if Nkind (Parameter_Type (Param_Spec)) /= |
10368 | N_Access_Definition | |
996ae0b0 RK |
10369 | then |
10370 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 10371 | else |
5ebfaacf AC |
10372 | Formal_Type := |
10373 | Access_Definition | |
10374 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
10375 | end if; |
10376 | ||
10377 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
10378 | end if; | |
2820d220 | 10379 | end if; |
800621e0 RD |
10380 | |
10381 | elsif Ekind (Formal) = E_Out_Parameter then | |
10382 | Num_Out_Params := Num_Out_Params + 1; | |
10383 | ||
10384 | if Num_Out_Params = 1 then | |
10385 | First_Out_Param := Formal; | |
10386 | end if; | |
10387 | ||
10388 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
10389 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
10390 | end if; |
10391 | ||
4172a8e3 AC |
10392 | -- Skip remaining processing if formal type was in error |
10393 | ||
10394 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
10395 | goto Next_Parameter; | |
10396 | end if; | |
10397 | ||
fecbd779 AC |
10398 | -- Force call by reference if aliased |
10399 | ||
10400 | if Is_Aliased (Formal) then | |
10401 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf AC |
10402 | |
10403 | -- Warn if user asked this to be passed by copy | |
10404 | ||
10405 | if Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10406 | Error_Msg_N | |
b785e0b8 | 10407 | ("cannot pass aliased parameter & by copy??", Formal); |
5ebfaacf AC |
10408 | end if; |
10409 | ||
10410 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy | |
10411 | ||
10412 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10413 | Set_Mechanism (Formal, By_Copy); | |
10414 | ||
10415 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Reference then | |
10416 | Set_Mechanism (Formal, By_Reference); | |
fecbd779 AC |
10417 | end if; |
10418 | ||
4172a8e3 | 10419 | <<Next_Parameter>> |
996ae0b0 RK |
10420 | Next (Param_Spec); |
10421 | end loop; | |
800621e0 RD |
10422 | |
10423 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
10424 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
10425 | end if; | |
996ae0b0 RK |
10426 | end Process_Formals; |
10427 | ||
fbf5a39b AC |
10428 | ---------------------------- |
10429 | -- Reference_Body_Formals -- | |
10430 | ---------------------------- | |
10431 | ||
10432 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
10433 | Fs : Entity_Id; | |
10434 | Fb : Entity_Id; | |
10435 | ||
10436 | begin | |
10437 | if Error_Posted (Spec) then | |
10438 | return; | |
10439 | end if; | |
10440 | ||
0a36105d JM |
10441 | -- Iterate over both lists. They may be of different lengths if the two |
10442 | -- specs are not conformant. | |
10443 | ||
fbf5a39b AC |
10444 | Fs := First_Formal (Spec); |
10445 | Fb := First_Formal (Bod); | |
0a36105d | 10446 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
10447 | Generate_Reference (Fs, Fb, 'b'); |
10448 | ||
10449 | if Style_Check then | |
10450 | Style.Check_Identifier (Fb, Fs); | |
10451 | end if; | |
10452 | ||
10453 | Set_Spec_Entity (Fb, Fs); | |
10454 | Set_Referenced (Fs, False); | |
10455 | Next_Formal (Fs); | |
10456 | Next_Formal (Fb); | |
10457 | end loop; | |
10458 | end Reference_Body_Formals; | |
10459 | ||
996ae0b0 RK |
10460 | ------------------------- |
10461 | -- Set_Actual_Subtypes -- | |
10462 | ------------------------- | |
10463 | ||
10464 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
84c0a895 AC |
10465 | Decl : Node_Id; |
10466 | Formal : Entity_Id; | |
10467 | T : Entity_Id; | |
10468 | First_Stmt : Node_Id := Empty; | |
10469 | AS_Needed : Boolean; | |
996ae0b0 RK |
10470 | |
10471 | begin | |
f3d57416 | 10472 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
10473 | -- actual subtypes (small optimization). |
10474 | ||
8fde064e | 10475 | if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
fbf5a39b AC |
10476 | return; |
10477 | end if; | |
10478 | ||
996ae0b0 RK |
10479 | Formal := First_Formal (Subp); |
10480 | while Present (Formal) loop | |
10481 | T := Etype (Formal); | |
10482 | ||
e895b435 | 10483 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
10484 | |
10485 | if Is_Constrained (T) then | |
10486 | AS_Needed := False; | |
10487 | ||
82c80734 | 10488 | -- If we have unknown discriminants, then we do not need an actual |
a90bd866 | 10489 | -- subtype, or more accurately we cannot figure it out. Note that |
82c80734 | 10490 | -- all class-wide types have unknown discriminants. |
996ae0b0 RK |
10491 | |
10492 | elsif Has_Unknown_Discriminants (T) then | |
10493 | AS_Needed := False; | |
10494 | ||
82c80734 RD |
10495 | -- At this stage we have an unconstrained type that may need an |
10496 | -- actual subtype. For sure the actual subtype is needed if we have | |
10497 | -- an unconstrained array type. | |
996ae0b0 RK |
10498 | |
10499 | elsif Is_Array_Type (T) then | |
10500 | AS_Needed := True; | |
10501 | ||
d8db0bca JM |
10502 | -- The only other case needing an actual subtype is an unconstrained |
10503 | -- record type which is an IN parameter (we cannot generate actual | |
10504 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
10505 | -- change the discriminant values. However we exclude the case of | |
10506 | -- initialization procedures, since discriminants are handled very | |
10507 | -- specially in this context, see the section entitled "Handling of | |
10508 | -- Discriminants" in Einfo. | |
10509 | ||
10510 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
10511 | -- in front end layout mode for size/offset values), since in such | |
10512 | -- functions only discriminants are referenced, and not only are such | |
10513 | -- subtypes not needed, but they cannot always be generated, because | |
10514 | -- of order of elaboration issues. | |
996ae0b0 RK |
10515 | |
10516 | elsif Is_Record_Type (T) | |
10517 | and then Ekind (Formal) = E_In_Parameter | |
10518 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 10519 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
10520 | and then not Is_Discrim_SO_Function (Subp) |
10521 | then | |
10522 | AS_Needed := True; | |
10523 | ||
10524 | -- All other cases do not need an actual subtype | |
10525 | ||
10526 | else | |
10527 | AS_Needed := False; | |
10528 | end if; | |
10529 | ||
10530 | -- Generate actual subtypes for unconstrained arrays and | |
10531 | -- unconstrained discriminated records. | |
10532 | ||
10533 | if AS_Needed then | |
7324bf49 | 10534 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 10535 | |
57a8057a | 10536 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
10537 | -- variable that renames the corresponding entry of the |
10538 | -- parameter block, and it is this local variable that may | |
da94696d | 10539 | -- require an actual subtype. |
fbf5a39b | 10540 | |
4460a9bc | 10541 | if Expander_Active then |
fbf5a39b AC |
10542 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
10543 | else | |
10544 | Decl := Build_Actual_Subtype (T, Formal); | |
10545 | end if; | |
10546 | ||
996ae0b0 RK |
10547 | if Present (Handled_Statement_Sequence (N)) then |
10548 | First_Stmt := | |
10549 | First (Statements (Handled_Statement_Sequence (N))); | |
10550 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
10551 | Mark_Rewrite_Insertion (Decl); | |
10552 | else | |
82c80734 RD |
10553 | -- If the accept statement has no body, there will be no |
10554 | -- reference to the actuals, so no need to compute actual | |
10555 | -- subtypes. | |
996ae0b0 RK |
10556 | |
10557 | return; | |
10558 | end if; | |
10559 | ||
10560 | else | |
fbf5a39b | 10561 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
10562 | Prepend (Decl, Declarations (N)); |
10563 | Mark_Rewrite_Insertion (Decl); | |
10564 | end if; | |
10565 | ||
82c80734 RD |
10566 | -- The declaration uses the bounds of an existing object, and |
10567 | -- therefore needs no constraint checks. | |
2820d220 | 10568 | |
7324bf49 | 10569 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 10570 | |
996ae0b0 RK |
10571 | -- We need to freeze manually the generated type when it is |
10572 | -- inserted anywhere else than in a declarative part. | |
10573 | ||
10574 | if Present (First_Stmt) then | |
10575 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 10576 | Freeze_Entity (Defining_Identifier (Decl), N)); |
fcadacf7 ES |
10577 | |
10578 | -- Ditto if the type has a dynamic predicate, because the | |
10579 | -- generated function will mention the actual subtype. | |
10580 | ||
10581 | elsif Has_Dynamic_Predicate_Aspect (T) then | |
10582 | Insert_List_Before_And_Analyze (Decl, | |
10583 | Freeze_Entity (Defining_Identifier (Decl), N)); | |
996ae0b0 RK |
10584 | end if; |
10585 | ||
fbf5a39b | 10586 | if Nkind (N) = N_Accept_Statement |
4460a9bc | 10587 | and then Expander_Active |
fbf5a39b AC |
10588 | then |
10589 | Set_Actual_Subtype (Renamed_Object (Formal), | |
10590 | Defining_Identifier (Decl)); | |
10591 | else | |
10592 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
10593 | end if; | |
996ae0b0 RK |
10594 | end if; |
10595 | ||
10596 | Next_Formal (Formal); | |
10597 | end loop; | |
10598 | end Set_Actual_Subtypes; | |
10599 | ||
10600 | --------------------- | |
10601 | -- Set_Formal_Mode -- | |
10602 | --------------------- | |
10603 | ||
10604 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
07aa5e6f | 10605 | Spec : constant Node_Id := Parent (Formal_Id); |
288cbbbd | 10606 | Id : constant Entity_Id := Scope (Formal_Id); |
996ae0b0 RK |
10607 | |
10608 | begin | |
10609 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
10610 | -- since we ensure that corresponding actuals are always valid at the | |
10611 | -- point of the call. | |
10612 | ||
10613 | if Out_Present (Spec) then | |
288cbbbd JM |
10614 | if Ekind_In (Id, E_Entry, E_Entry_Family) |
10615 | or else Is_Subprogram_Or_Generic_Subprogram (Id) | |
10616 | then | |
10617 | Set_Has_Out_Or_In_Out_Parameter (Id, True); | |
10618 | end if; | |
10619 | ||
10620 | if Ekind_In (Id, E_Function, E_Generic_Function) then | |
fc999c5d | 10621 | |
b4ca2d2c | 10622 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
10623 | |
10624 | if Ada_Version >= Ada_2012 then | |
e6425869 AC |
10625 | |
10626 | -- Even in Ada 2012 operators can only have IN parameters | |
10627 | ||
10628 | if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then | |
10629 | Error_Msg_N ("operators can only have IN parameters", Spec); | |
10630 | end if; | |
10631 | ||
c56a9ba4 AC |
10632 | if In_Present (Spec) then |
10633 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10634 | else | |
10635 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
10636 | end if; | |
10637 | ||
b4ca2d2c AC |
10638 | -- But not in earlier versions of Ada |
10639 | ||
c56a9ba4 AC |
10640 | else |
10641 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
10642 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10643 | end if; | |
996ae0b0 RK |
10644 | |
10645 | elsif In_Present (Spec) then | |
10646 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10647 | ||
10648 | else | |
fbf5a39b AC |
10649 | Set_Ekind (Formal_Id, E_Out_Parameter); |
10650 | Set_Never_Set_In_Source (Formal_Id, True); | |
10651 | Set_Is_True_Constant (Formal_Id, False); | |
10652 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
10653 | end if; |
10654 | ||
10655 | else | |
10656 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10657 | end if; | |
10658 | ||
fbf5a39b | 10659 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
10660 | -- guarantees that access parameters are always non-null. We also set |
10661 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
10662 | |
10663 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 10664 | |
885c4871 | 10665 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 10666 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 10667 | |
0791fbe9 | 10668 | if Ada_Version < Ada_2005 |
2813bb6b | 10669 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
10670 | then |
10671 | Set_Is_Known_Non_Null (Formal_Id); | |
10672 | Set_Can_Never_Be_Null (Formal_Id); | |
10673 | end if; | |
2813bb6b | 10674 | |
41251c60 JM |
10675 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
10676 | ||
2813bb6b ES |
10677 | elsif Is_Access_Type (Etype (Formal_Id)) |
10678 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
10679 | then | |
2813bb6b | 10680 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
10681 | |
10682 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
10683 | -- access checks) for the case of an IN parameter, which cannot | |
10684 | -- be changed, or for an IN OUT parameter, which can be changed but | |
10685 | -- not to a null value. But for an OUT parameter, the initial value | |
10686 | -- passed in can be null, so we can't set this flag in that case. | |
10687 | ||
10688 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
10689 | Set_Can_Never_Be_Null (Formal_Id); | |
10690 | end if; | |
fbf5a39b AC |
10691 | end if; |
10692 | ||
996ae0b0 RK |
10693 | Set_Mechanism (Formal_Id, Default_Mechanism); |
10694 | Set_Formal_Validity (Formal_Id); | |
10695 | end Set_Formal_Mode; | |
10696 | ||
10697 | ------------------------- | |
10698 | -- Set_Formal_Validity -- | |
10699 | ------------------------- | |
10700 | ||
10701 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
10702 | begin | |
82c80734 RD |
10703 | -- If no validity checking, then we cannot assume anything about the |
10704 | -- validity of parameters, since we do not know there is any checking | |
10705 | -- of the validity on the call side. | |
996ae0b0 RK |
10706 | |
10707 | if not Validity_Checks_On then | |
10708 | return; | |
10709 | ||
fbf5a39b AC |
10710 | -- If validity checking for parameters is enabled, this means we are |
10711 | -- not supposed to make any assumptions about argument values. | |
10712 | ||
10713 | elsif Validity_Check_Parameters then | |
10714 | return; | |
10715 | ||
10716 | -- If we are checking in parameters, we will assume that the caller is | |
10717 | -- also checking parameters, so we can assume the parameter is valid. | |
10718 | ||
996ae0b0 RK |
10719 | elsif Ekind (Formal_Id) = E_In_Parameter |
10720 | and then Validity_Check_In_Params | |
10721 | then | |
10722 | Set_Is_Known_Valid (Formal_Id, True); | |
10723 | ||
fbf5a39b AC |
10724 | -- Similar treatment for IN OUT parameters |
10725 | ||
996ae0b0 RK |
10726 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
10727 | and then Validity_Check_In_Out_Params | |
10728 | then | |
10729 | Set_Is_Known_Valid (Formal_Id, True); | |
10730 | end if; | |
10731 | end Set_Formal_Validity; | |
10732 | ||
10733 | ------------------------ | |
10734 | -- Subtype_Conformant -- | |
10735 | ------------------------ | |
10736 | ||
ce2b6ba5 JM |
10737 | function Subtype_Conformant |
10738 | (New_Id : Entity_Id; | |
10739 | Old_Id : Entity_Id; | |
10740 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10741 | is | |
996ae0b0 | 10742 | Result : Boolean; |
996ae0b0 | 10743 | begin |
ce2b6ba5 JM |
10744 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
10745 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10746 | return Result; |
10747 | end Subtype_Conformant; | |
10748 | ||
10749 | --------------------- | |
10750 | -- Type_Conformant -- | |
10751 | --------------------- | |
10752 | ||
41251c60 JM |
10753 | function Type_Conformant |
10754 | (New_Id : Entity_Id; | |
10755 | Old_Id : Entity_Id; | |
10756 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10757 | is | |
996ae0b0 | 10758 | Result : Boolean; |
996ae0b0 | 10759 | begin |
c8ef728f | 10760 | May_Hide_Profile := False; |
41251c60 JM |
10761 | Check_Conformance |
10762 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
10763 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10764 | return Result; |
10765 | end Type_Conformant; | |
10766 | ||
10767 | ------------------------------- | |
10768 | -- Valid_Operator_Definition -- | |
10769 | ------------------------------- | |
10770 | ||
10771 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
10772 | N : Integer := 0; | |
10773 | F : Entity_Id; | |
10774 | Id : constant Name_Id := Chars (Designator); | |
10775 | N_OK : Boolean; | |
10776 | ||
10777 | begin | |
10778 | F := First_Formal (Designator); | |
996ae0b0 RK |
10779 | while Present (F) loop |
10780 | N := N + 1; | |
10781 | ||
10782 | if Present (Default_Value (F)) then | |
ed2233dc | 10783 | Error_Msg_N |
996ae0b0 RK |
10784 | ("default values not allowed for operator parameters", |
10785 | Parent (F)); | |
220d1fd9 AC |
10786 | |
10787 | -- For function instantiations that are operators, we must check | |
10788 | -- separately that the corresponding generic only has in-parameters. | |
84c0a895 AC |
10789 | -- For subprogram declarations this is done in Set_Formal_Mode. Such |
10790 | -- an error could not arise in earlier versions of the language. | |
220d1fd9 AC |
10791 | |
10792 | elsif Ekind (F) /= E_In_Parameter then | |
84c0a895 | 10793 | Error_Msg_N ("operators can only have IN parameters", F); |
996ae0b0 RK |
10794 | end if; |
10795 | ||
10796 | Next_Formal (F); | |
10797 | end loop; | |
10798 | ||
10799 | -- Verify that user-defined operators have proper number of arguments | |
10800 | -- First case of operators which can only be unary | |
10801 | ||
b69cd36a | 10802 | if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
996ae0b0 RK |
10803 | N_OK := (N = 1); |
10804 | ||
10805 | -- Case of operators which can be unary or binary | |
10806 | ||
b69cd36a | 10807 | elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
10808 | N_OK := (N in 1 .. 2); |
10809 | ||
10810 | -- All other operators can only be binary | |
10811 | ||
10812 | else | |
10813 | N_OK := (N = 2); | |
10814 | end if; | |
10815 | ||
10816 | if not N_OK then | |
10817 | Error_Msg_N | |
10818 | ("incorrect number of arguments for operator", Designator); | |
10819 | end if; | |
10820 | ||
10821 | if Id = Name_Op_Ne | |
10822 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
10823 | and then not Is_Intrinsic_Subprogram (Designator) | |
10824 | then | |
10825 | Error_Msg_N | |
84c0a895 | 10826 | ("explicit definition of inequality not allowed", Designator); |
996ae0b0 RK |
10827 | end if; |
10828 | end Valid_Operator_Definition; | |
10829 | ||
10830 | end Sem_Ch6; |