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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 | -- -- |
4b490c1e | 9 | -- Copyright (C) 1992-2020, Free Software Foundation, Inc. -- |
996ae0b0 RK |
10 | -- -- |
11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
996ae0b0 RK |
14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
17 | -- for more details. You should have received a copy of the GNU General -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
996ae0b0 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
996ae0b0 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
879ac954 AC |
26 | with Aspects; use Aspects; |
27 | with Atree; use Atree; | |
28 | with Checks; use Checks; | |
29 | with Contracts; use Contracts; | |
30 | with Debug; use Debug; | |
31 | with Einfo; use Einfo; | |
32 | with Elists; use Elists; | |
33 | with Errout; use Errout; | |
34 | with Expander; use Expander; | |
35 | with Exp_Ch6; use Exp_Ch6; | |
36 | with Exp_Ch7; use Exp_Ch7; | |
37 | with Exp_Ch9; use Exp_Ch9; | |
38 | with Exp_Dbug; use Exp_Dbug; | |
879ac954 AC |
39 | with Exp_Tss; use Exp_Tss; |
40 | with Exp_Util; use Exp_Util; | |
879ac954 AC |
41 | with Freeze; use Freeze; |
42 | with Ghost; use Ghost; | |
43 | with Inline; use Inline; | |
44 | with Itypes; use Itypes; | |
45 | with Lib.Xref; use Lib.Xref; | |
46 | with Layout; use Layout; | |
47 | with Namet; use Namet; | |
48 | with Lib; use Lib; | |
49 | with Nlists; use Nlists; | |
50 | with Nmake; use Nmake; | |
51 | with Opt; use Opt; | |
52 | with Output; use Output; | |
53 | with Restrict; use Restrict; | |
54 | with Rident; use Rident; | |
55 | with Rtsfind; use Rtsfind; | |
56 | with Sem; use Sem; | |
57 | with Sem_Aux; use Sem_Aux; | |
58 | with Sem_Cat; use Sem_Cat; | |
59 | with Sem_Ch3; use Sem_Ch3; | |
60 | with Sem_Ch4; use Sem_Ch4; | |
61 | with Sem_Ch5; use Sem_Ch5; | |
62 | with Sem_Ch8; use Sem_Ch8; | |
5e127570 | 63 | with Sem_Ch9; use Sem_Ch9; |
879ac954 AC |
64 | with Sem_Ch10; use Sem_Ch10; |
65 | with Sem_Ch12; use Sem_Ch12; | |
66 | with Sem_Ch13; use Sem_Ch13; | |
67 | with Sem_Dim; use Sem_Dim; | |
68 | with Sem_Disp; use Sem_Disp; | |
69 | with Sem_Dist; use Sem_Dist; | |
70 | with Sem_Elim; use Sem_Elim; | |
71 | with Sem_Eval; use Sem_Eval; | |
72 | with Sem_Mech; use Sem_Mech; | |
73 | with Sem_Prag; use Sem_Prag; | |
74 | with Sem_Res; use Sem_Res; | |
75 | with Sem_Util; use Sem_Util; | |
76 | with Sem_Type; use Sem_Type; | |
77 | with Sem_Warn; use Sem_Warn; | |
78 | with Sinput; use Sinput; | |
79 | with Stand; use Stand; | |
80 | with Sinfo; use Sinfo; | |
81 | with Sinfo.CN; use Sinfo.CN; | |
82 | with Snames; use Snames; | |
83 | with Stringt; use Stringt; | |
996ae0b0 | 84 | with Style; |
879ac954 AC |
85 | with Stylesw; use Stylesw; |
86 | with Tbuild; use Tbuild; | |
87 | with Uintp; use Uintp; | |
88 | with Urealp; use Urealp; | |
89 | with Validsw; use Validsw; | |
996ae0b0 RK |
90 | |
91 | package body Sem_Ch6 is | |
92 | ||
c8ef728f | 93 | May_Hide_Profile : Boolean := False; |
ec4867fa ES |
94 | -- This flag is used to indicate that two formals in two subprograms being |
95 | -- checked for conformance differ only in that one is an access parameter | |
96 | -- while the other is of a general access type with the same designated | |
97 | -- type. In this case, if the rest of the signatures match, a call to | |
98 | -- either subprogram may be ambiguous, which is worth a warning. The flag | |
99 | -- is set in Compatible_Types, and the warning emitted in | |
100 | -- New_Overloaded_Entity. | |
c8ef728f | 101 | |
996ae0b0 RK |
102 | ----------------------- |
103 | -- Local Subprograms -- | |
104 | ----------------------- | |
105 | ||
c9d70ab1 AC |
106 | procedure Analyze_Function_Return (N : Node_Id); |
107 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement | |
108 | -- applies to a [generic] function. | |
109 | ||
110 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); | |
111 | -- Analyze a generic subprogram body. N is the body to be analyzed, and | |
112 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
113 | ||
4d8f3296 ES |
114 | procedure Analyze_Null_Procedure |
115 | (N : Node_Id; | |
116 | Is_Completion : out Boolean); | |
9d2a2071 | 117 | -- A null procedure can be a declaration or (Ada 2012) a completion |
4d8f3296 | 118 | |
5d37ba92 | 119 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 120 | -- Common processing for simple and extended return statements |
ec4867fa | 121 | |
82c80734 RD |
122 | procedure Analyze_Return_Type (N : Node_Id); |
123 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 124 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
125 | -- outer homographs. |
126 | ||
b1b543d2 | 127 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
128 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
129 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 130 | |
806f6d37 AC |
131 | function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
132 | -- Returns true if Subp can override a predefined operator. | |
133 | ||
996ae0b0 | 134 | procedure Check_Conformance |
41251c60 JM |
135 | (New_Id : Entity_Id; |
136 | Old_Id : Entity_Id; | |
137 | Ctype : Conformance_Type; | |
138 | Errmsg : Boolean; | |
139 | Conforms : out Boolean; | |
140 | Err_Loc : Node_Id := Empty; | |
141 | Get_Inst : Boolean := False; | |
142 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
143 | -- Given two entities, this procedure checks that the profiles associated |
144 | -- with these entities meet the conformance criterion given by the third | |
145 | -- parameter. If they conform, Conforms is set True and control returns | |
146 | -- to the caller. If they do not conform, Conforms is set to False, and | |
147 | -- in addition, if Errmsg is True on the call, proper messages are output | |
148 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
149 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
150 | -- error messages are placed on the appropriate part of the construct | |
151 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
152 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
153 | -- be called. | |
154 | ||
b420ba79 AC |
155 | procedure Check_Limited_Return |
156 | (N : Node_Id; | |
157 | Expr : Node_Id; | |
158 | R_Type : Entity_Id); | |
159 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning limited | |
160 | -- types. Used only for simple return statements. Expr is the expression | |
161 | -- returned. | |
162 | ||
996ae0b0 RK |
163 | procedure Check_Subprogram_Order (N : Node_Id); |
164 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
165 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
166 | ||
996ae0b0 RK |
167 | procedure Check_Returns |
168 | (HSS : Node_Id; | |
169 | Mode : Character; | |
c8ef728f ES |
170 | Err : out Boolean; |
171 | Proc : Entity_Id := Empty); | |
172 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 173 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
174 | -- handled statement sequence for the subprogram body. This procedure |
175 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
176 | -- used for functions) or do not have a return (Mode = 'P', used for | |
177 | -- No_Return procedures). The flag Err is set if there are any control | |
178 | -- paths not explicitly terminated by a return in the function case, and is | |
179 | -- True otherwise. Proc is the entity for the procedure case and is used | |
180 | -- in posting the warning message. | |
996ae0b0 | 181 | |
e5a58fac AC |
182 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
183 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
184 | -- must appear before the type is frozen, and have the same visibility as | |
185 | -- that of the type. This procedure checks that this rule is met, and | |
186 | -- otherwise emits an error on the subprogram declaration and a warning | |
b2834fbd AC |
187 | -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode, |
188 | -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier | |
189 | -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility | |
190 | -- is set, otherwise the call has no effect. | |
e5a58fac | 191 | |
996ae0b0 | 192 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
193 | -- This procedure makes S, a new overloaded entity, into the first visible |
194 | -- entity with that name. | |
996ae0b0 | 195 | |
a5b62485 AC |
196 | function Is_Non_Overriding_Operation |
197 | (Prev_E : Entity_Id; | |
198 | New_E : Entity_Id) return Boolean; | |
199 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
200 | -- overrides an inherited operation only if the corresponding operation | |
260359e3 AC |
201 | -- was overriding in the generic. This needs to be checked for primitive |
202 | -- operations of types derived (in the generic unit) from formal private | |
203 | -- or formal derived types. | |
a5b62485 | 204 | |
996ae0b0 RK |
205 | procedure Make_Inequality_Operator (S : Entity_Id); |
206 | -- Create the declaration for an inequality operator that is implicitly | |
207 | -- created by a user-defined equality operator that yields a boolean. | |
208 | ||
e4d29736 JM |
209 | procedure Preanalyze_Formal_Expression (N : Node_Id; T : Entity_Id); |
210 | -- Preanalysis of default expressions of subprogram formals. N is the | |
211 | -- expression to be analyzed and T is the expected type. | |
212 | ||
996ae0b0 RK |
213 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
214 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
215 | -- setting the proper validity status for this entity, which depends on |
216 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
217 | |
218 | --------------------------------------------- | |
219 | -- Analyze_Abstract_Subprogram_Declaration -- | |
220 | --------------------------------------------- | |
221 | ||
222 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
1af4455a HK |
223 | Scop : constant Entity_Id := Current_Scope; |
224 | Subp_Id : constant Entity_Id := | |
241ebe89 | 225 | Analyze_Subprogram_Specification (Specification (N)); |
996ae0b0 RK |
226 | |
227 | begin | |
ce5ba43a | 228 | Check_SPARK_05_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 229 | |
241ebe89 | 230 | Generate_Definition (Subp_Id); |
c9d70ab1 | 231 | |
90e491a7 PMR |
232 | -- Set the SPARK mode from the current context (may be overwritten later |
233 | -- with explicit pragma). | |
234 | ||
235 | Set_SPARK_Pragma (Subp_Id, SPARK_Mode_Pragma); | |
236 | Set_SPARK_Pragma_Inherited (Subp_Id); | |
237 | ||
238 | -- Preserve relevant elaboration-related attributes of the context which | |
239 | -- are no longer available or very expensive to recompute once analysis, | |
240 | -- resolution, and expansion are over. | |
241 | ||
242 | Mark_Elaboration_Attributes | |
162ed06f HK |
243 | (N_Id => Subp_Id, |
244 | Checks => True, | |
245 | Warnings => True); | |
90e491a7 | 246 | |
241ebe89 HK |
247 | Set_Is_Abstract_Subprogram (Subp_Id); |
248 | New_Overloaded_Entity (Subp_Id); | |
249 | Check_Delayed_Subprogram (Subp_Id); | |
996ae0b0 | 250 | |
241ebe89 | 251 | Set_Categorization_From_Scope (Subp_Id, Scop); |
996ae0b0 | 252 | |
241ebe89 HK |
253 | if Ekind (Scope (Subp_Id)) = E_Protected_Type then |
254 | Error_Msg_N ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
255 | |
256 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
257 | -- operation nor an operation that overrides an inherited subprogram or | |
258 | -- predefined operator, since this most likely indicates a mistake. | |
259 | ||
260 | elsif Warn_On_Redundant_Constructs | |
241ebe89 HK |
261 | and then not Is_Dispatching_Operation (Subp_Id) |
262 | and then not Present (Overridden_Operation (Subp_Id)) | |
263 | and then (not Is_Operator_Symbol_Name (Chars (Subp_Id)) | |
264 | or else Scop /= Scope (Etype (First_Formal (Subp_Id)))) | |
5d37ba92 ES |
265 | then |
266 | Error_Msg_N | |
dbfeb4fa | 267 | ("abstract subprogram is not dispatching or overriding?r?", N); |
996ae0b0 | 268 | end if; |
fbf5a39b | 269 | |
241ebe89 HK |
270 | Generate_Reference_To_Formals (Subp_Id); |
271 | Check_Eliminated (Subp_Id); | |
eaba57fb RD |
272 | |
273 | if Has_Aspects (N) then | |
241ebe89 | 274 | Analyze_Aspect_Specifications (N, Subp_Id); |
eaba57fb | 275 | end if; |
996ae0b0 RK |
276 | end Analyze_Abstract_Subprogram_Declaration; |
277 | ||
b0186f71 AC |
278 | --------------------------------- |
279 | -- Analyze_Expression_Function -- | |
280 | --------------------------------- | |
281 | ||
282 | procedure Analyze_Expression_Function (N : Node_Id) is | |
8d1fe980 AC |
283 | Expr : constant Node_Id := Expression (N); |
284 | Loc : constant Source_Ptr := Sloc (N); | |
285 | LocX : constant Source_Ptr := Sloc (Expr); | |
286 | Spec : constant Node_Id := Specification (N); | |
d2d4b355 | 287 | |
4ac62786 AC |
288 | -- Local variables |
289 | ||
ec225529 | 290 | Asp : Node_Id; |
ec225529 AC |
291 | New_Body : Node_Id; |
292 | New_Spec : Node_Id; | |
293 | Orig_N : Node_Id; | |
294 | Ret : Node_Id; | |
b0186f71 | 295 | |
3f89eb7f JS |
296 | Def_Id : Entity_Id := Empty; |
297 | Prev : Entity_Id; | |
b0186f71 | 298 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
299 | -- declaration is completed. Def_Id is needed to analyze the spec. |
300 | ||
4ac62786 AC |
301 | -- Start of processing for Analyze_Expression_Function |
302 | ||
b0186f71 AC |
303 | begin |
304 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 305 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
306 | -- function into an equivalent subprogram body, and analyze it. |
307 | ||
308 | -- Expression functions are inlined unconditionally. The back-end will | |
309 | -- determine whether this is possible. | |
310 | ||
311 | Inline_Processing_Required := True; | |
b727a82b | 312 | |
8d1fe980 AC |
313 | -- Create a specification for the generated body. This must be done |
314 | -- prior to the analysis of the initial declaration. | |
b727a82b | 315 | |
8d1fe980 AC |
316 | New_Spec := Copy_Subprogram_Spec (Spec); |
317 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
d2d4b355 AC |
318 | |
319 | -- If there are previous overloadable entities with the same name, | |
320 | -- check whether any of them is completed by the expression function. | |
b04d926e | 321 | -- In a generic context a formal subprogram has no completion. |
d2d4b355 | 322 | |
4b6f99f5 RD |
323 | if Present (Prev) |
324 | and then Is_Overloadable (Prev) | |
b04d926e AC |
325 | and then not Is_Formal_Subprogram (Prev) |
326 | then | |
51597c23 AC |
327 | Def_Id := Analyze_Subprogram_Specification (Spec); |
328 | Prev := Find_Corresponding_Spec (N); | |
35e7063a AC |
329 | |
330 | -- The previous entity may be an expression function as well, in | |
331 | -- which case the redeclaration is illegal. | |
332 | ||
333 | if Present (Prev) | |
5073ad7a AC |
334 | and then Nkind (Original_Node (Unit_Declaration_Node (Prev))) = |
335 | N_Expression_Function | |
35e7063a | 336 | then |
bc5e261c ES |
337 | Error_Msg_Sloc := Sloc (Prev); |
338 | Error_Msg_N ("& conflicts with declaration#", Def_Id); | |
35e7063a AC |
339 | return; |
340 | end if; | |
d2d4b355 | 341 | end if; |
b0186f71 | 342 | |
4ac62786 | 343 | Ret := Make_Simple_Return_Statement (LocX, Expr); |
b913199e | 344 | |
b0186f71 AC |
345 | New_Body := |
346 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 347 | Specification => New_Spec, |
b0186f71 AC |
348 | Declarations => Empty_List, |
349 | Handled_Statement_Sequence => | |
350 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 351 | Statements => New_List (Ret))); |
549cc9c2 | 352 | Set_Was_Expression_Function (New_Body); |
b0186f71 | 353 | |
e7f23f06 AC |
354 | -- If the expression completes a generic subprogram, we must create a |
355 | -- separate node for the body, because at instantiation the original | |
356 | -- node of the generic copy must be a generic subprogram body, and | |
357 | -- cannot be a expression function. Otherwise we just rewrite the | |
358 | -- expression with the non-generic body. | |
359 | ||
6d7e5c54 | 360 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
e7f23f06 | 361 | Insert_After (N, New_Body); |
6d7e5c54 | 362 | |
e7f23f06 AC |
363 | -- Propagate any aspects or pragmas that apply to the expression |
364 | -- function to the proper body when the expression function acts | |
365 | -- as a completion. | |
366 | ||
367 | if Has_Aspects (N) then | |
368 | Move_Aspects (N, To => New_Body); | |
369 | end if; | |
370 | ||
371 | Relocate_Pragmas_To_Body (New_Body); | |
b0186f71 | 372 | |
b0186f71 | 373 | Rewrite (N, Make_Null_Statement (Loc)); |
d2d4b355 | 374 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
375 | Analyze (N); |
376 | Analyze (New_Body); | |
d2b10647 | 377 | Set_Is_Inlined (Prev); |
b0186f71 | 378 | |
e5c4e2bc | 379 | -- If the expression function is a completion, the previous declaration |
88fa9a24 | 380 | -- must come from source. We know already that it appears in the current |
e5c4e2bc AC |
381 | -- scope. The entity itself may be internally created if within a body |
382 | -- to be inlined. | |
383 | ||
4b6f99f5 | 384 | elsif Present (Prev) |
4ac62786 | 385 | and then Is_Overloadable (Prev) |
b04d926e | 386 | and then not Is_Formal_Subprogram (Prev) |
4ac62786 | 387 | and then Comes_From_Source (Parent (Prev)) |
b04d926e | 388 | then |
d2d4b355 | 389 | Set_Has_Completion (Prev, False); |
88fa9a24 | 390 | Set_Is_Inlined (Prev); |
76264f60 | 391 | |
4ac62786 AC |
392 | -- AI12-0103: Expression functions that are a completion freeze their |
393 | -- expression but don't freeze anything else (unlike regular bodies). | |
1b31321b | 394 | |
c6d2191a | 395 | -- Note that we cannot defer this freezing to the analysis of the |
1b31321b AC |
396 | -- expression itself, because a freeze node might appear in a nested |
397 | -- scope, leading to an elaboration order issue in gigi. | |
20ad0586 | 398 | -- As elsewhere, we do not emit freeze nodes within a generic unit. |
c6d2191a | 399 | |
20ad0586 | 400 | if not Inside_A_Generic then |
92a68a04 HK |
401 | Freeze_Expr_Types |
402 | (Def_Id => Def_Id, | |
403 | Typ => Etype (Def_Id), | |
404 | Expr => Expr, | |
405 | N => N); | |
20ad0586 | 406 | end if; |
1b31321b | 407 | |
76264f60 AC |
408 | -- For navigation purposes, indicate that the function is a body |
409 | ||
410 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 411 | Rewrite (N, New_Body); |
e7f23f06 | 412 | |
ec225529 | 413 | -- Remove any existing aspects from the original node because the act |
60aa5228 | 414 | -- of rewriting causes the list to be shared between the two nodes. |
c0cdbd39 | 415 | |
ec225529 AC |
416 | Orig_N := Original_Node (N); |
417 | Remove_Aspects (Orig_N); | |
c0cdbd39 | 418 | |
aaa0a838 | 419 | -- Propagate any pragmas that apply to expression function to the |
e7f23f06 AC |
420 | -- proper body when the expression function acts as a completion. |
421 | -- Aspects are automatically transfered because of node rewriting. | |
422 | ||
423 | Relocate_Pragmas_To_Body (N); | |
d2b10647 ES |
424 | Analyze (N); |
425 | ||
60aa5228 AC |
426 | -- Once the aspects of the generated body have been analyzed, create |
427 | -- a copy for ASIS purposes and associate it with the original node. | |
65f1ca2e | 428 | -- Is this still needed??? |
ec225529 AC |
429 | |
430 | if Has_Aspects (N) then | |
431 | Set_Aspect_Specifications (Orig_N, | |
432 | New_Copy_List_Tree (Aspect_Specifications (N))); | |
433 | end if; | |
434 | ||
6d7e5c54 AC |
435 | -- Prev is the previous entity with the same name, but it is can |
436 | -- be an unrelated spec that is not completed by the expression | |
437 | -- function. In that case the relevant entity is the one in the body. | |
438 | -- Not clear that the backend can inline it in this case ??? | |
439 | ||
440 | if Has_Completion (Prev) then | |
31af8899 AC |
441 | |
442 | -- The formals of the expression function are body formals, | |
443 | -- and do not appear in the ali file, which will only contain | |
444 | -- references to the formals of the original subprogram spec. | |
445 | ||
446 | declare | |
447 | F1 : Entity_Id; | |
448 | F2 : Entity_Id; | |
449 | ||
450 | begin | |
451 | F1 := First_Formal (Def_Id); | |
452 | F2 := First_Formal (Prev); | |
453 | ||
454 | while Present (F1) loop | |
455 | Set_Spec_Entity (F1, F2); | |
456 | Next_Formal (F1); | |
457 | Next_Formal (F2); | |
458 | end loop; | |
459 | end; | |
460 | ||
6d7e5c54 AC |
461 | else |
462 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
463 | end if; | |
464 | ||
0b5b2bbc | 465 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 466 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
467 | |
468 | else | |
a52e6d7e AC |
469 | -- An expression function that is not a completion is not a |
470 | -- subprogram declaration, and thus cannot appear in a protected | |
471 | -- definition. | |
472 | ||
473 | if Nkind (Parent (N)) = N_Protected_Definition then | |
474 | Error_Msg_N | |
475 | ("an expression function is not a legal protected operation", N); | |
476 | end if; | |
477 | ||
b8e6830b | 478 | Rewrite (N, Make_Subprogram_Declaration (Loc, Specification => Spec)); |
c0cdbd39 | 479 | |
ec225529 | 480 | -- Remove any existing aspects from the original node because the act |
60aa5228 | 481 | -- of rewriting causes the list to be shared between the two nodes. |
c0cdbd39 | 482 | |
ec225529 AC |
483 | Orig_N := Original_Node (N); |
484 | Remove_Aspects (Orig_N); | |
c0cdbd39 | 485 | |
b0186f71 | 486 | Analyze (N); |
ec225529 | 487 | |
60aa5228 AC |
488 | -- Once the aspects of the generated spec have been analyzed, create |
489 | -- a copy for ASIS purposes and associate it with the original node. | |
65f1ca2e | 490 | -- Is this still needed??? |
ec225529 AC |
491 | |
492 | if Has_Aspects (N) then | |
493 | Set_Aspect_Specifications (Orig_N, | |
494 | New_Copy_List_Tree (Aspect_Specifications (N))); | |
495 | end if; | |
b04d926e | 496 | |
d29f68cf AC |
497 | -- If aspect SPARK_Mode was specified on the body, it needs to be |
498 | -- repeated both on the generated spec and the body. | |
499 | ||
500 | Asp := Find_Aspect (Defining_Unit_Name (Spec), Aspect_SPARK_Mode); | |
501 | ||
502 | if Present (Asp) then | |
503 | Asp := New_Copy_Tree (Asp); | |
504 | Set_Analyzed (Asp, False); | |
505 | Set_Aspect_Specifications (New_Body, New_List (Asp)); | |
506 | end if; | |
507 | ||
ec225529 | 508 | Def_Id := Defining_Entity (N); |
f63adaa7 AC |
509 | Set_Is_Inlined (Def_Id); |
510 | ||
511 | -- Establish the linkages between the spec and the body. These are | |
512 | -- used when the expression function acts as the prefix of attribute | |
513 | -- 'Access in order to freeze the original expression which has been | |
514 | -- moved to the generated body. | |
515 | ||
516 | Set_Corresponding_Body (N, Defining_Entity (New_Body)); | |
517 | Set_Corresponding_Spec (New_Body, Def_Id); | |
ec225529 | 518 | |
812e6118 | 519 | -- Within a generic preanalyze the original expression for name |
e699b76e AC |
520 | -- capture. The body is also generated but plays no role in |
521 | -- this because it is not part of the original source. | |
b04d926e AC |
522 | |
523 | if Inside_A_Generic then | |
b420ba79 AC |
524 | Set_Has_Completion (Def_Id); |
525 | Push_Scope (Def_Id); | |
526 | Install_Formals (Def_Id); | |
527 | Preanalyze_Spec_Expression (Expr, Etype (Def_Id)); | |
528 | End_Scope; | |
b04d926e AC |
529 | end if; |
530 | ||
6d7e5c54 AC |
531 | -- To prevent premature freeze action, insert the new body at the end |
532 | -- of the current declarations, or at the end of the package spec. | |
b913199e | 533 | -- However, resolve usage names now, to prevent spurious visibility |
ad4e3362 ES |
534 | -- on later entities. Note that the function can now be called in |
535 | -- the current declarative part, which will appear to be prior to | |
536 | -- the presence of the body in the code. There are nevertheless no | |
537 | -- order of elaboration issues because all name resolution has taken | |
538 | -- place at the point of declaration. | |
6d7e5c54 AC |
539 | |
540 | declare | |
e876c43a | 541 | Decls : List_Id := List_Containing (N); |
b420ba79 | 542 | Expr : constant Node_Id := Expression (Ret); |
e876c43a | 543 | Par : constant Node_Id := Parent (Decls); |
b420ba79 | 544 | Typ : constant Entity_Id := Etype (Def_Id); |
6d7e5c54 AC |
545 | |
546 | begin | |
fce54763 AC |
547 | -- If this is a wrapper created for in an instance for a formal |
548 | -- subprogram, insert body after declaration, to be analyzed when | |
549 | -- the enclosing instance is analyzed. | |
550 | ||
551 | if GNATprove_Mode | |
f63adaa7 | 552 | and then Is_Generic_Actual_Subprogram (Def_Id) |
6d7e5c54 | 553 | then |
fce54763 AC |
554 | Insert_After (N, New_Body); |
555 | ||
556 | else | |
557 | if Nkind (Par) = N_Package_Specification | |
558 | and then Decls = Visible_Declarations (Par) | |
559 | and then Present (Private_Declarations (Par)) | |
560 | and then not Is_Empty_List (Private_Declarations (Par)) | |
561 | then | |
562 | Decls := Private_Declarations (Par); | |
563 | end if; | |
6d7e5c54 | 564 | |
fce54763 | 565 | Insert_After (Last (Decls), New_Body); |
3a8e3f63 | 566 | |
a83d0680 | 567 | -- Preanalyze the expression if not already done above |
845f06e2 | 568 | |
a83d0680 | 569 | if not Inside_A_Generic then |
f63adaa7 AC |
570 | Push_Scope (Def_Id); |
571 | Install_Formals (Def_Id); | |
e4d29736 | 572 | Preanalyze_Formal_Expression (Expr, Typ); |
b420ba79 | 573 | Check_Limited_Return (Original_Node (N), Expr, Typ); |
f63adaa7 | 574 | End_Scope; |
b420ba79 | 575 | end if; |
fce54763 | 576 | end if; |
6d7e5c54 | 577 | end; |
b0186f71 | 578 | end if; |
0b5b2bbc | 579 | |
7f9fcce8 BD |
580 | -- Check incorrect use of dynamically tagged expression. This doesn't |
581 | -- fall out automatically when analyzing the generated function body, | |
582 | -- because Check_Dynamically_Tagged_Expression deliberately ignores | |
583 | -- nodes that don't come from source. | |
584 | ||
585 | if Present (Def_Id) | |
586 | and then Nkind (Def_Id) in N_Has_Etype | |
587 | and then Is_Tagged_Type (Etype (Def_Id)) | |
588 | then | |
589 | Check_Dynamically_Tagged_Expression | |
d7cc5f0e PMR |
590 | (Expr => Expr, |
591 | Typ => Etype (Def_Id), | |
7f9fcce8 BD |
592 | Related_Nod => Original_Node (N)); |
593 | end if; | |
594 | ||
3f89eb7f JS |
595 | -- We must enforce checks for unreferenced formals in our newly |
596 | -- generated function, so we propagate the referenced flag from the | |
597 | -- original spec to the new spec as well as setting Comes_From_Source. | |
0b5b2bbc | 598 | |
3f89eb7f JS |
599 | if Present (Parameter_Specifications (New_Spec)) then |
600 | declare | |
601 | Form_New_Def : Entity_Id; | |
602 | Form_New_Spec : Entity_Id; | |
603 | Form_Old_Def : Entity_Id; | |
604 | Form_Old_Spec : Entity_Id; | |
3f89eb7f | 605 | |
9b19c244 | 606 | begin |
3f89eb7f JS |
607 | Form_New_Spec := First (Parameter_Specifications (New_Spec)); |
608 | Form_Old_Spec := First (Parameter_Specifications (Spec)); | |
609 | ||
610 | while Present (Form_New_Spec) and then Present (Form_Old_Spec) loop | |
611 | Form_New_Def := Defining_Identifier (Form_New_Spec); | |
612 | Form_Old_Def := Defining_Identifier (Form_Old_Spec); | |
613 | ||
614 | Set_Comes_From_Source (Form_New_Def, True); | |
615 | ||
616 | -- Because of the usefulness of unreferenced controlling | |
617 | -- formals we exempt them from unreferenced warnings by marking | |
618 | -- them as always referenced. | |
619 | ||
9b19c244 HK |
620 | Set_Referenced (Form_Old_Def, |
621 | (Is_Formal (Form_Old_Def) | |
622 | and then Is_Controlling_Formal (Form_Old_Def)) | |
623 | or else Referenced (Form_Old_Def)); | |
3f89eb7f JS |
624 | |
625 | Next (Form_New_Spec); | |
626 | Next (Form_Old_Spec); | |
627 | end loop; | |
628 | end; | |
629 | end if; | |
b0186f71 AC |
630 | end Analyze_Expression_Function; |
631 | ||
ec4867fa ES |
632 | ---------------------------------------- |
633 | -- Analyze_Extended_Return_Statement -- | |
634 | ---------------------------------------- | |
635 | ||
636 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
637 | begin | |
c86cf714 | 638 | Check_Compiler_Unit ("extended return statement", N); |
5d37ba92 | 639 | Analyze_Return_Statement (N); |
ec4867fa ES |
640 | end Analyze_Extended_Return_Statement; |
641 | ||
996ae0b0 RK |
642 | ---------------------------- |
643 | -- Analyze_Function_Call -- | |
644 | ---------------------------- | |
645 | ||
646 | procedure Analyze_Function_Call (N : Node_Id) is | |
a7e68e7f HK |
647 | Actuals : constant List_Id := Parameter_Associations (N); |
648 | Func_Nam : constant Node_Id := Name (N); | |
649 | Actual : Node_Id; | |
650 | ||
996ae0b0 | 651 | begin |
a7e68e7f | 652 | Analyze (Func_Nam); |
996ae0b0 | 653 | |
3e7302c3 AC |
654 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
655 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
656 | -- has been analyzed and we just return. | |
82c80734 | 657 | |
a7e68e7f HK |
658 | if Nkind (Func_Nam) = N_Selected_Component |
659 | and then Name (N) /= Func_Nam | |
82c80734 RD |
660 | and then Is_Rewrite_Substitution (N) |
661 | and then Present (Etype (N)) | |
662 | then | |
663 | return; | |
664 | end if; | |
665 | ||
996ae0b0 RK |
666 | -- If error analyzing name, then set Any_Type as result type and return |
667 | ||
a7e68e7f | 668 | if Etype (Func_Nam) = Any_Type then |
996ae0b0 RK |
669 | Set_Etype (N, Any_Type); |
670 | return; | |
671 | end if; | |
672 | ||
673 | -- Otherwise analyze the parameters | |
674 | ||
e24329cd YM |
675 | if Present (Actuals) then |
676 | Actual := First (Actuals); | |
996ae0b0 RK |
677 | while Present (Actual) loop |
678 | Analyze (Actual); | |
679 | Check_Parameterless_Call (Actual); | |
680 | Next (Actual); | |
681 | end loop; | |
682 | end if; | |
683 | ||
684 | Analyze_Call (N); | |
996ae0b0 RK |
685 | end Analyze_Function_Call; |
686 | ||
ec4867fa ES |
687 | ----------------------------- |
688 | -- Analyze_Function_Return -- | |
689 | ----------------------------- | |
690 | ||
691 | procedure Analyze_Function_Return (N : Node_Id) is | |
a7e68e7f HK |
692 | Loc : constant Source_Ptr := Sloc (N); |
693 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
694 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
ec4867fa | 695 | |
5d37ba92 | 696 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
697 | -- Function result subtype |
698 | ||
d4a45898 JS |
699 | procedure Check_Return_Obj_Accessibility (Return_Stmt : Node_Id); |
700 | -- Apply legality rule of 6.5 (5.9) to the access discriminants of an | |
43184ab7 | 701 | -- aggregate in a return statement. |
ed11bbfe | 702 | |
ec4867fa ES |
703 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); |
704 | -- Check that the return_subtype_indication properly matches the result | |
705 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
706 | ||
d4a45898 JS |
707 | ------------------------------------ |
708 | -- Check_Return_Obj_Accessibility -- | |
709 | ------------------------------------ | |
ed11bbfe | 710 | |
d4a45898 JS |
711 | procedure Check_Return_Obj_Accessibility (Return_Stmt : Node_Id) is |
712 | Assoc : Node_Id; | |
713 | Agg : Node_Id := Empty; | |
714 | Discr : Entity_Id; | |
715 | Expr : Node_Id; | |
716 | Obj : Node_Id; | |
717 | Process_Exprs : Boolean := False; | |
718 | Return_Obj : Node_Id; | |
ed11bbfe AC |
719 | |
720 | begin | |
d4a45898 JS |
721 | -- Only perform checks on record types with access discriminants |
722 | ||
723 | if not Is_Record_Type (R_Type) | |
724 | or else not Has_Discriminants (R_Type) | |
725 | then | |
726 | return; | |
727 | end if; | |
728 | ||
729 | -- We are only interested in return statements | |
730 | ||
731 | if not Nkind_In (Return_Stmt, N_Extended_Return_Statement, | |
732 | N_Simple_Return_Statement) | |
733 | then | |
734 | return; | |
735 | end if; | |
736 | ||
737 | -- Fetch the object from the return statement, in the case of a | |
738 | -- simple return statement the expression is part of the node. | |
739 | ||
740 | if Nkind (Return_Stmt) = N_Extended_Return_Statement then | |
741 | Return_Obj := Last (Return_Object_Declarations (Return_Stmt)); | |
742 | ||
743 | -- We could be looking at something that's been expanded with | |
744 | -- an initialzation procedure which we can safely ignore. | |
745 | ||
746 | if Nkind (Return_Obj) /= N_Object_Declaration then | |
747 | return; | |
748 | end if; | |
749 | else | |
750 | Return_Obj := Return_Stmt; | |
751 | end if; | |
752 | ||
753 | -- We may need to check an aggregate or a subtype indication | |
754 | -- depending on how the discriminants were specified and whether | |
755 | -- we are looking at an extended return statement. | |
756 | ||
757 | if Nkind (Return_Obj) = N_Object_Declaration | |
758 | and then Nkind (Object_Definition (Return_Obj)) | |
759 | = N_Subtype_Indication | |
760 | then | |
761 | Assoc := First (Constraints | |
762 | (Constraint (Object_Definition (Return_Obj)))); | |
763 | else | |
764 | -- Qualified expressions may be nested | |
765 | ||
766 | Agg := Original_Node (Expression (Return_Obj)); | |
767 | while Nkind (Agg) = N_Qualified_Expression loop | |
768 | Agg := Original_Node (Expression (Agg)); | |
769 | end loop; | |
770 | ||
771 | -- If we are looking at an aggregate instead of a function call we | |
772 | -- can continue checking accessibility for the supplied | |
773 | -- discriminant associations. | |
774 | ||
775 | if Nkind (Agg) = N_Aggregate then | |
776 | if Present (Expressions (Agg)) then | |
777 | Assoc := First (Expressions (Agg)); | |
778 | Process_Exprs := True; | |
779 | else | |
780 | Assoc := First (Component_Associations (Agg)); | |
781 | end if; | |
782 | ||
783 | -- Otherwise the expression is not of interest ??? | |
784 | ||
785 | else | |
786 | return; | |
787 | end if; | |
788 | end if; | |
789 | ||
790 | -- Move through the discriminants checking the accessibility level | |
791 | -- of each co-extension's associated expression. | |
792 | ||
793 | Discr := First_Discriminant (R_Type); | |
794 | while Present (Discr) loop | |
795 | if Ekind (Etype (Discr)) = E_Anonymous_Access_Type then | |
796 | ||
797 | if Nkind (Assoc) = N_Attribute_Reference then | |
798 | Expr := Assoc; | |
799 | elsif Nkind_In (Assoc, N_Component_Association, | |
800 | N_Discriminant_Association) | |
801 | then | |
ed11bbfe | 802 | Expr := Expression (Assoc); |
43542919 JS |
803 | else |
804 | Expr := Empty; | |
d4a45898 | 805 | end if; |
996ce809 | 806 | |
d4a45898 JS |
807 | -- This anonymous access discriminant has an associated |
808 | -- expression which needs checking. | |
809 | ||
43542919 JS |
810 | if Present (Expr) |
811 | and then Nkind (Expr) = N_Attribute_Reference | |
d4a45898 JS |
812 | and then Attribute_Name (Expr) /= Name_Unrestricted_Access |
813 | then | |
814 | -- Obtain the object to perform static checks on by moving | |
815 | -- up the prefixes in the expression taking into account | |
da566eeb JS |
816 | -- named access types and renamed objects within the |
817 | -- expression. | |
d4a45898 | 818 | |
43542919 | 819 | Obj := Original_Node (Prefix (Expr)); |
d4a45898 | 820 | loop |
da566eeb JS |
821 | while Nkind_In (Obj, N_Explicit_Dereference, |
822 | N_Indexed_Component, | |
823 | N_Selected_Component) | |
824 | loop | |
825 | -- When we encounter a named access type then we can | |
826 | -- ignore accessibility checks on the dereference. | |
827 | ||
828 | if Ekind (Etype (Original_Node (Prefix (Obj)))) | |
829 | in E_Access_Type .. | |
830 | E_Access_Protected_Subprogram_Type | |
831 | then | |
832 | if Nkind (Obj) = N_Selected_Component then | |
833 | Obj := Selector_Name (Obj); | |
834 | else | |
835 | Obj := Original_Node (Prefix (Obj)); | |
836 | end if; | |
837 | exit; | |
d4a45898 | 838 | end if; |
da566eeb JS |
839 | |
840 | Obj := Original_Node (Prefix (Obj)); | |
841 | end loop; | |
842 | ||
843 | if Nkind (Obj) = N_Selected_Component then | |
844 | Obj := Selector_Name (Obj); | |
d4a45898 JS |
845 | end if; |
846 | ||
da566eeb | 847 | -- Check for renamings |
d4a45898 | 848 | |
da566eeb JS |
849 | pragma Assert (Is_Entity_Name (Obj)); |
850 | ||
851 | if Present (Renamed_Object (Entity (Obj))) then | |
852 | Obj := Renamed_Object (Entity (Obj)); | |
853 | else | |
854 | exit; | |
855 | end if; | |
856 | end loop; | |
2f0067f4 | 857 | |
d4a45898 JS |
858 | -- Do not check aliased formals or function calls. A |
859 | -- run-time check may still be needed ??? | |
ed11bbfe | 860 | |
2f0067f4 JS |
861 | if Is_Formal (Entity (Obj)) |
862 | and then Is_Aliased (Entity (Obj)) | |
863 | then | |
864 | null; | |
d4a45898 | 865 | |
2f0067f4 JS |
866 | elsif Object_Access_Level (Obj) > |
867 | Scope_Depth (Scope (Scope_Id)) | |
868 | then | |
869 | Error_Msg_N | |
870 | ("access discriminant in return aggregate would " | |
871 | & "be a dangling reference", Obj); | |
ed11bbfe AC |
872 | end if; |
873 | end if; | |
d4a45898 | 874 | end if; |
ed11bbfe | 875 | |
d4a45898 JS |
876 | Next_Discriminant (Discr); |
877 | ||
878 | if not Is_List_Member (Assoc) then | |
879 | Assoc := Empty; | |
880 | else | |
881 | Nlists.Next (Assoc); | |
882 | end if; | |
883 | ||
884 | -- After aggregate expressions, examine component associations if | |
885 | -- present. | |
886 | ||
887 | if No (Assoc) then | |
888 | if Present (Agg) | |
889 | and then Process_Exprs | |
890 | and then Present (Component_Associations (Agg)) | |
891 | then | |
892 | Assoc := First (Component_Associations (Agg)); | |
893 | Process_Exprs := False; | |
894 | else | |
895 | exit; | |
896 | end if; | |
897 | end if; | |
898 | end loop; | |
899 | end Check_Return_Obj_Accessibility; | |
ed11bbfe | 900 | |
ec4867fa ES |
901 | ------------------------------------- |
902 | -- Check_Return_Subtype_Indication -- | |
903 | ------------------------------------- | |
904 | ||
905 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
906 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
907 | ||
908 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
909 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
910 | |
911 | Subtype_Ind : constant Node_Id := | |
912 | Object_Definition (Original_Node (Obj_Decl)); | |
913 | ||
7f568bfa AC |
914 | procedure Error_No_Match (N : Node_Id); |
915 | -- Output error messages for case where types do not statically | |
916 | -- match. N is the location for the messages. | |
917 | ||
918 | -------------------- | |
919 | -- Error_No_Match -- | |
920 | -------------------- | |
921 | ||
922 | procedure Error_No_Match (N : Node_Id) is | |
923 | begin | |
924 | Error_Msg_N | |
925 | ("subtype must statically match function result subtype", N); | |
926 | ||
927 | if not Predicates_Match (R_Stm_Type, R_Type) then | |
928 | Error_Msg_Node_2 := R_Type; | |
929 | Error_Msg_NE | |
3ccedacc | 930 | ("\predicate of& does not match predicate of&", |
7f568bfa AC |
931 | N, R_Stm_Type); |
932 | end if; | |
933 | end Error_No_Match; | |
934 | ||
935 | -- Start of processing for Check_Return_Subtype_Indication | |
936 | ||
ec4867fa | 937 | begin |
7665e4bd | 938 | -- First, avoid cascaded errors |
ec4867fa ES |
939 | |
940 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
941 | return; | |
942 | end if; | |
943 | ||
944 | -- "return access T" case; check that the return statement also has | |
945 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 946 | -- if this is an access to subprogram the signatures must match. |
ec4867fa | 947 | |
d1eb8a82 AC |
948 | if Is_Anonymous_Access_Type (R_Type) then |
949 | if Is_Anonymous_Access_Type (R_Stm_Type) then | |
950 | if Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 951 | then |
53cf4600 ES |
952 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
953 | Base_Type (Designated_Type (R_Type)) | |
954 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
955 | then | |
7f568bfa | 956 | Error_No_Match (Subtype_Mark (Subtype_Ind)); |
53cf4600 ES |
957 | end if; |
958 | ||
959 | else | |
d1eb8a82 AC |
960 | -- For two anonymous access to subprogram types, the types |
961 | -- themselves must be type conformant. | |
53cf4600 ES |
962 | |
963 | if not Conforming_Types | |
d1eb8a82 | 964 | (R_Stm_Type, R_Type, Fully_Conformant) |
53cf4600 | 965 | then |
7f568bfa | 966 | Error_No_Match (Subtype_Ind); |
53cf4600 | 967 | end if; |
ec4867fa | 968 | end if; |
0a36105d | 969 | |
ec4867fa ES |
970 | else |
971 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
972 | end if; | |
973 | ||
6cce2156 GD |
974 | -- If the return object is of an anonymous access type, then report |
975 | -- an error if the function's result type is not also anonymous. | |
976 | ||
d1eb8a82 AC |
977 | elsif Is_Anonymous_Access_Type (R_Stm_Type) then |
978 | pragma Assert (not Is_Anonymous_Access_Type (R_Type)); | |
979 | Error_Msg_N | |
980 | ("anonymous access not allowed for function with named access " | |
981 | & "result", Subtype_Ind); | |
6cce2156 | 982 | |
81d93365 AC |
983 | -- Subtype indication case: check that the return object's type is |
984 | -- covered by the result type, and that the subtypes statically match | |
985 | -- when the result subtype is constrained. Also handle record types | |
986 | -- with unknown discriminants for which we have built the underlying | |
987 | -- record view. Coverage is needed to allow specific-type return | |
988 | -- objects when the result type is class-wide (see AI05-32). | |
989 | ||
990 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 991 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
992 | and then |
993 | Covers | |
994 | (Base_Type (R_Type), | |
995 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
996 | then |
997 | -- A null exclusion may be present on the return type, on the | |
998 | -- function specification, on the object declaration or on the | |
999 | -- subtype itself. | |
ec4867fa | 1000 | |
21d27997 RD |
1001 | if Is_Access_Type (R_Type) |
1002 | and then | |
d1eb8a82 AC |
1003 | (Can_Never_Be_Null (R_Type) |
1004 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
1005 | Can_Never_Be_Null (R_Stm_Type) | |
21d27997 | 1006 | then |
7f568bfa | 1007 | Error_No_Match (Subtype_Ind); |
21d27997 RD |
1008 | end if; |
1009 | ||
105b5e65 | 1010 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa | 1011 | |
d1eb8a82 | 1012 | if Is_Constrained (R_Type) or else Is_Access_Type (R_Type) then |
ec4867fa | 1013 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
7f568bfa | 1014 | Error_No_Match (Subtype_Ind); |
ec4867fa ES |
1015 | end if; |
1016 | end if; | |
1017 | ||
a8b346d2 RD |
1018 | -- All remaining cases are illegal |
1019 | ||
1020 | -- Note: previous versions of this subprogram allowed the return | |
1021 | -- value to be the ancestor of the return type if the return type | |
1022 | -- was a null extension. This was plainly incorrect. | |
ff7139c3 | 1023 | |
ec4867fa ES |
1024 | else |
1025 | Error_Msg_N | |
1026 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
1027 | end if; | |
1028 | end Check_Return_Subtype_Indication; | |
1029 | ||
1030 | --------------------- | |
1031 | -- Local Variables -- | |
1032 | --------------------- | |
1033 | ||
445e5888 | 1034 | Expr : Node_Id; |
dcd5fd67 | 1035 | Obj_Decl : Node_Id := Empty; |
ec4867fa ES |
1036 | |
1037 | -- Start of processing for Analyze_Function_Return | |
1038 | ||
1039 | begin | |
1040 | Set_Return_Present (Scope_Id); | |
1041 | ||
5d37ba92 | 1042 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 1043 | Expr := Expression (N); |
4ee646da | 1044 | |
e917aec2 RD |
1045 | -- Guard against a malformed expression. The parser may have tried to |
1046 | -- recover but the node is not analyzable. | |
4ee646da AC |
1047 | |
1048 | if Nkind (Expr) = N_Error then | |
1049 | Set_Etype (Expr, Any_Type); | |
1050 | Expander_Mode_Save_And_Set (False); | |
1051 | return; | |
1052 | ||
1053 | else | |
0180fd26 AC |
1054 | -- The resolution of a controlled [extension] aggregate associated |
1055 | -- with a return statement creates a temporary which needs to be | |
1056 | -- finalized on function exit. Wrap the return statement inside a | |
1057 | -- block so that the finalization machinery can detect this case. | |
1058 | -- This early expansion is done only when the return statement is | |
1059 | -- not part of a handled sequence of statements. | |
1060 | ||
1061 | if Nkind_In (Expr, N_Aggregate, | |
1062 | N_Extension_Aggregate) | |
1063 | and then Needs_Finalization (R_Type) | |
1064 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
1065 | then | |
1066 | Rewrite (N, | |
1067 | Make_Block_Statement (Loc, | |
1068 | Handled_Statement_Sequence => | |
1069 | Make_Handled_Sequence_Of_Statements (Loc, | |
1070 | Statements => New_List (Relocate_Node (N))))); | |
1071 | ||
1072 | Analyze (N); | |
1073 | return; | |
1074 | end if; | |
1075 | ||
4b963531 AC |
1076 | Analyze (Expr); |
1077 | ||
1078 | -- Ada 2005 (AI-251): If the type of the returned object is | |
1079 | -- an access to an interface type then we add an implicit type | |
1080 | -- conversion to force the displacement of the "this" pointer to | |
1081 | -- reference the secondary dispatch table. We cannot delay the | |
1082 | -- generation of this implicit conversion until the expansion | |
1083 | -- because in this case the type resolution changes the decoration | |
1084 | -- of the expression node to match R_Type; by contrast, if the | |
1085 | -- returned object is a class-wide interface type then it is too | |
1086 | -- early to generate here the implicit conversion since the return | |
1087 | -- statement may be rewritten by the expander into an extended | |
1088 | -- return statement whose expansion takes care of adding the | |
1089 | -- implicit type conversion to displace the pointer to the object. | |
1090 | ||
1091 | if Expander_Active | |
1092 | and then Serious_Errors_Detected = 0 | |
1093 | and then Is_Access_Type (R_Type) | |
ed323421 | 1094 | and then not Nkind_In (Expr, N_Null, N_Raise_Expression) |
4b963531 AC |
1095 | and then Is_Interface (Designated_Type (R_Type)) |
1096 | and then Is_Progenitor (Designated_Type (R_Type), | |
1097 | Designated_Type (Etype (Expr))) | |
1098 | then | |
73e5aa55 | 1099 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); |
4b963531 AC |
1100 | Analyze (Expr); |
1101 | end if; | |
1102 | ||
1103 | Resolve (Expr, R_Type); | |
b420ba79 | 1104 | Check_Limited_Return (N, Expr, R_Type); |
ed11bbfe | 1105 | |
d4a45898 | 1106 | Check_Return_Obj_Accessibility (N); |
4ee646da | 1107 | end if; |
ec4867fa | 1108 | |
ad05f2e9 | 1109 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 1110 | |
fe5d3068 | 1111 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
1112 | and then |
1113 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 1114 | or else Present (Next (N))) |
607d0635 | 1115 | then |
ce5ba43a | 1116 | Check_SPARK_05_Restriction |
fe5d3068 | 1117 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
1118 | end if; |
1119 | ||
ec4867fa | 1120 | else |
ce5ba43a | 1121 | Check_SPARK_05_Restriction ("extended RETURN is not allowed", N); |
445e5888 | 1122 | Obj_Decl := Last (Return_Object_Declarations (N)); |
607d0635 | 1123 | |
ec4867fa ES |
1124 | -- Analyze parts specific to extended_return_statement: |
1125 | ||
1126 | declare | |
de6cad7c | 1127 | Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
b9daa96e | 1128 | HSS : constant Node_Id := Handled_Statement_Sequence (N); |
ec4867fa ES |
1129 | |
1130 | begin | |
1131 | Expr := Expression (Obj_Decl); | |
1132 | ||
1133 | -- Note: The check for OK_For_Limited_Init will happen in | |
1134 | -- Analyze_Object_Declaration; we treat it as a normal | |
1135 | -- object declaration. | |
1136 | ||
cd1c668b | 1137 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
1138 | Analyze (Obj_Decl); |
1139 | ||
ec4867fa ES |
1140 | Check_Return_Subtype_Indication (Obj_Decl); |
1141 | ||
1142 | if Present (HSS) then | |
1143 | Analyze (HSS); | |
1144 | ||
1145 | if Present (Exception_Handlers (HSS)) then | |
1146 | ||
1147 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
1148 | -- Probably by creating an actual N_Block_Statement. | |
1149 | -- Probably in Expand. | |
1150 | ||
1151 | null; | |
1152 | end if; | |
1153 | end if; | |
1154 | ||
9337aa0a AC |
1155 | -- Mark the return object as referenced, since the return is an |
1156 | -- implicit reference of the object. | |
1157 | ||
1158 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
1159 | ||
ec4867fa | 1160 | Check_References (Stm_Entity); |
de6cad7c | 1161 | |
d4a45898 JS |
1162 | Check_Return_Obj_Accessibility (N); |
1163 | ||
de6cad7c AC |
1164 | -- Check RM 6.5 (5.9/3) |
1165 | ||
1166 | if Has_Aliased then | |
1167 | if Ada_Version < Ada_2012 then | |
dbfeb4fa RD |
1168 | |
1169 | -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? | |
1170 | -- Can it really happen (extended return???) | |
1171 | ||
1172 | Error_Msg_N | |
b785e0b8 AC |
1173 | ("aliased only allowed for limited return objects " |
1174 | & "in Ada 2012??", N); | |
de6cad7c | 1175 | |
51245e2d | 1176 | elsif not Is_Limited_View (R_Type) then |
3ccedacc AC |
1177 | Error_Msg_N |
1178 | ("aliased only allowed for limited return objects", N); | |
de6cad7c AC |
1179 | end if; |
1180 | end if; | |
ec4867fa ES |
1181 | end; |
1182 | end if; | |
1183 | ||
21d27997 | 1184 | -- Case of Expr present |
5d37ba92 | 1185 | |
dcd5fd67 | 1186 | if Present (Expr) then |
21d27997 | 1187 | |
dcd5fd67 PMR |
1188 | -- Defend against previous errors |
1189 | ||
1190 | if Nkind (Expr) = N_Empty | |
1191 | or else No (Etype (Expr)) | |
1192 | then | |
1193 | return; | |
1194 | end if; | |
21d27997 | 1195 | |
5d37ba92 ES |
1196 | -- Apply constraint check. Note that this is done before the implicit |
1197 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 1198 | -- ensure correct generation of the null-excluding check associated |
ad430786 BD |
1199 | -- with null-excluding expressions found in return statements. We |
1200 | -- don't need a check if the subtype of the return object is the | |
1201 | -- same as the result subtype of the function. | |
1202 | ||
1203 | if Nkind (N) /= N_Extended_Return_Statement | |
1204 | or else Nkind (Obj_Decl) /= N_Object_Declaration | |
1205 | or else Nkind (Object_Definition (Obj_Decl)) not in N_Has_Entity | |
1206 | or else Entity (Object_Definition (Obj_Decl)) /= R_Type | |
1207 | then | |
1208 | Apply_Constraint_Check (Expr, R_Type); | |
1209 | end if; | |
5d37ba92 | 1210 | |
bcbe14db ES |
1211 | -- The return value is converted to the return type of the function, |
1212 | -- which implies a predicate check if the return type is predicated. | |
1213 | -- We do not apply the check to a case expression because it will | |
1214 | -- be expanded into a series of return statements, each of which | |
1215 | -- will receive a predicate check. | |
1216 | ||
1217 | if Nkind (Expr) /= N_Case_Expression then | |
1218 | Apply_Predicate_Check (Expr, R_Type); | |
1219 | end if; | |
1220 | ||
5d37ba92 ES |
1221 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access |
1222 | -- type, apply an implicit conversion of the expression to that type | |
1223 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 1224 | |
0791fbe9 | 1225 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
1226 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
1227 | then | |
1228 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
1229 | Analyze_And_Resolve (Expr, R_Type); | |
b6b5cca8 AC |
1230 | |
1231 | -- If this is a local anonymous access to subprogram, the | |
1232 | -- accessibility check can be applied statically. The return is | |
1233 | -- illegal if the access type of the return expression is declared | |
1234 | -- inside of the subprogram (except if it is the subtype indication | |
1235 | -- of an extended return statement). | |
1236 | ||
9fe696a3 | 1237 | elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then |
b6b5cca8 AC |
1238 | if not Comes_From_Source (Current_Scope) |
1239 | or else Ekind (Current_Scope) = E_Return_Statement | |
1240 | then | |
1241 | null; | |
1242 | ||
1243 | elsif | |
1244 | Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) | |
1245 | then | |
1246 | Error_Msg_N ("cannot return local access to subprogram", N); | |
1247 | end if; | |
1ebc2612 AC |
1248 | |
1249 | -- The expression cannot be of a formal incomplete type | |
1250 | ||
1251 | elsif Ekind (Etype (Expr)) = E_Incomplete_Type | |
1252 | and then Is_Generic_Type (Etype (Expr)) | |
1253 | then | |
1254 | Error_Msg_N | |
1255 | ("cannot return expression of a formal incomplete type", N); | |
ec4867fa ES |
1256 | end if; |
1257 | ||
21d27997 RD |
1258 | -- If the result type is class-wide, then check that the return |
1259 | -- expression's type is not declared at a deeper level than the | |
1260 | -- function (RM05-6.5(5.6/2)). | |
1261 | ||
0791fbe9 | 1262 | if Ada_Version >= Ada_2005 |
21d27997 RD |
1263 | and then Is_Class_Wide_Type (R_Type) |
1264 | then | |
1265 | if Type_Access_Level (Etype (Expr)) > | |
1266 | Subprogram_Access_Level (Scope_Id) | |
1267 | then | |
1268 | Error_Msg_N | |
3ccedacc AC |
1269 | ("level of return expression type is deeper than " |
1270 | & "class-wide function!", Expr); | |
21d27997 RD |
1271 | end if; |
1272 | end if; | |
1273 | ||
4755cce9 JM |
1274 | -- Check incorrect use of dynamically tagged expression |
1275 | ||
1276 | if Is_Tagged_Type (R_Type) then | |
1277 | Check_Dynamically_Tagged_Expression | |
1278 | (Expr => Expr, | |
1279 | Typ => R_Type, | |
1280 | Related_Nod => N); | |
ec4867fa ES |
1281 | end if; |
1282 | ||
ec4867fa ES |
1283 | -- ??? A real run-time accessibility check is needed in cases |
1284 | -- involving dereferences of access parameters. For now we just | |
1285 | -- check the static cases. | |
1286 | ||
0791fbe9 | 1287 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
51245e2d | 1288 | and then Is_Limited_View (Etype (Scope_Id)) |
ec4867fa ES |
1289 | and then Object_Access_Level (Expr) > |
1290 | Subprogram_Access_Level (Scope_Id) | |
1291 | then | |
9694c039 AC |
1292 | -- Suppress the message in a generic, where the rewriting |
1293 | -- is irrelevant. | |
1294 | ||
1295 | if Inside_A_Generic then | |
1296 | null; | |
1297 | ||
1298 | else | |
1299 | Rewrite (N, | |
1300 | Make_Raise_Program_Error (Loc, | |
1301 | Reason => PE_Accessibility_Check_Failed)); | |
1302 | Analyze (N); | |
1303 | ||
43417b90 | 1304 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
1305 | Error_Msg_N ("cannot return a local value by reference<<", N); |
1306 | Error_Msg_NE ("\& [<<", N, Standard_Program_Error); | |
9694c039 | 1307 | end if; |
ec4867fa | 1308 | end if; |
5d37ba92 ES |
1309 | |
1310 | if Known_Null (Expr) | |
1311 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
1312 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
1313 | then | |
1314 | Apply_Compile_Time_Constraint_Error | |
1315 | (N => Expr, | |
1316 | Msg => "(Ada 2005) null not allowed for " | |
dbfeb4fa | 1317 | & "null-excluding return??", |
5d37ba92 ES |
1318 | Reason => CE_Null_Not_Allowed); |
1319 | end if; | |
445e5888 AC |
1320 | |
1321 | -- RM 6.5 (5.4/3): accessibility checks also apply if the return object | |
1322 | -- has no initializing expression. | |
1323 | ||
1324 | elsif Ada_Version > Ada_2005 and then Is_Class_Wide_Type (R_Type) then | |
1325 | if Type_Access_Level (Etype (Defining_Identifier (Obj_Decl))) > | |
1326 | Subprogram_Access_Level (Scope_Id) | |
1327 | then | |
1328 | Error_Msg_N | |
1329 | ("level of return expression type is deeper than " | |
1330 | & "class-wide function!", Obj_Decl); | |
1331 | end if; | |
ec4867fa ES |
1332 | end if; |
1333 | end Analyze_Function_Return; | |
1334 | ||
996ae0b0 RK |
1335 | ------------------------------------- |
1336 | -- Analyze_Generic_Subprogram_Body -- | |
1337 | ------------------------------------- | |
1338 | ||
1339 | procedure Analyze_Generic_Subprogram_Body | |
1340 | (N : Node_Id; | |
1341 | Gen_Id : Entity_Id) | |
1342 | is | |
fbf5a39b | 1343 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 1344 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 1345 | Body_Id : Entity_Id; |
996ae0b0 | 1346 | New_N : Node_Id; |
fbf5a39b | 1347 | Spec : Node_Id; |
996ae0b0 RK |
1348 | |
1349 | begin | |
82c80734 RD |
1350 | -- Copy body and disable expansion while analyzing the generic For a |
1351 | -- stub, do not copy the stub (which would load the proper body), this | |
1352 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
1353 | |
1354 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
1355 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
1356 | Rewrite (N, New_N); | |
caf07df9 AC |
1357 | |
1358 | -- Once the contents of the generic copy and the template are | |
1359 | -- swapped, do the same for their respective aspect specifications. | |
1360 | ||
1361 | Exchange_Aspects (N, New_N); | |
1362 | ||
1363 | -- Collect all contract-related source pragmas found within the | |
1364 | -- template and attach them to the contract of the subprogram body. | |
1365 | -- This contract is used in the capture of global references within | |
1366 | -- annotations. | |
1367 | ||
1368 | Create_Generic_Contract (N); | |
1369 | ||
996ae0b0 RK |
1370 | Start_Generic; |
1371 | end if; | |
1372 | ||
1373 | Spec := Specification (N); | |
1374 | ||
1375 | -- Within the body of the generic, the subprogram is callable, and | |
1376 | -- behaves like the corresponding non-generic unit. | |
1377 | ||
fbf5a39b | 1378 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
1379 | |
1380 | if Kind = E_Generic_Procedure | |
1381 | and then Nkind (Spec) /= N_Procedure_Specification | |
1382 | then | |
fbf5a39b | 1383 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
1384 | return; |
1385 | ||
1386 | elsif Kind = E_Generic_Function | |
1387 | and then Nkind (Spec) /= N_Function_Specification | |
1388 | then | |
fbf5a39b | 1389 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
1390 | return; |
1391 | end if; | |
1392 | ||
fbf5a39b | 1393 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
1394 | |
1395 | if Has_Completion (Gen_Id) | |
1396 | and then Nkind (Parent (N)) /= N_Subunit | |
1397 | then | |
1398 | Error_Msg_N ("duplicate generic body", N); | |
1399 | return; | |
1400 | else | |
1401 | Set_Has_Completion (Gen_Id); | |
1402 | end if; | |
1403 | ||
1404 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1405 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1406 | else | |
1407 | Set_Corresponding_Spec (N, Gen_Id); | |
1408 | end if; | |
1409 | ||
1410 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1411 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1412 | end if; | |
1413 | ||
1414 | -- Make generic parameters immediately visible in the body. They are | |
1415 | -- needed to process the formals declarations. Then make the formals | |
1416 | -- visible in a separate step. | |
1417 | ||
0a36105d | 1418 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1419 | |
1420 | declare | |
1421 | E : Entity_Id; | |
1422 | First_Ent : Entity_Id; | |
1423 | ||
1424 | begin | |
1425 | First_Ent := First_Entity (Gen_Id); | |
1426 | ||
1427 | E := First_Ent; | |
1428 | while Present (E) and then not Is_Formal (E) loop | |
1429 | Install_Entity (E); | |
1430 | Next_Entity (E); | |
1431 | end loop; | |
1432 | ||
1433 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1434 | ||
1435 | -- Now generic formals are visible, and the specification can be | |
1436 | -- analyzed, for subsequent conformance check. | |
1437 | ||
fbf5a39b | 1438 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1439 | |
fbf5a39b | 1440 | -- Make formal parameters visible |
996ae0b0 RK |
1441 | |
1442 | if Present (E) then | |
1443 | ||
fbf5a39b AC |
1444 | -- E is the first formal parameter, we loop through the formals |
1445 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1446 | |
1447 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1448 | while Present (E) loop |
1449 | Install_Entity (E); | |
1450 | Next_Formal (E); | |
1451 | end loop; | |
1452 | end if; | |
1453 | ||
e895b435 | 1454 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1455 | |
ec4867fa ES |
1456 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
1457 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
1458 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1459 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1460 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
c5cec2fe | 1461 | |
fbf5a39b AC |
1462 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1463 | ||
1464 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1465 | ||
e895b435 | 1466 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1467 | |
1468 | Set_Ekind (Gen_Id, Kind); | |
1469 | Set_Ekind (Body_Id, Kind); | |
1470 | ||
1471 | if Present (First_Ent) then | |
1472 | Set_First_Entity (Gen_Id, First_Ent); | |
1473 | end if; | |
1474 | ||
1475 | End_Scope; | |
1476 | return; | |
1477 | end if; | |
996ae0b0 | 1478 | |
82c80734 RD |
1479 | -- If this is a compilation unit, it must be made visible explicitly, |
1480 | -- because the compilation of the declaration, unlike other library | |
1481 | -- unit declarations, does not. If it is not a unit, the following | |
1482 | -- is redundant but harmless. | |
996ae0b0 RK |
1483 | |
1484 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1485 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1486 | |
ec4867fa ES |
1487 | if Is_Child_Unit (Gen_Id) then |
1488 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1489 | end if; | |
1490 | ||
996ae0b0 | 1491 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 | 1492 | |
90e491a7 | 1493 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
f145ece7 | 1494 | Set_SPARK_Pragma_Inherited (Body_Id); |
579847c2 | 1495 | |
caf07df9 AC |
1496 | -- Analyze any aspect specifications that appear on the generic |
1497 | -- subprogram body. | |
1498 | ||
1499 | if Has_Aspects (N) then | |
e9d08fd7 | 1500 | Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
caf07df9 AC |
1501 | end if; |
1502 | ||
996ae0b0 RK |
1503 | Analyze_Declarations (Declarations (N)); |
1504 | Check_Completion; | |
996ae0b0 | 1505 | |
879ac954 AC |
1506 | -- Process the contract of the subprogram body after all declarations |
1507 | -- have been analyzed. This ensures that any contract-related pragmas | |
1508 | -- are available through the N_Contract node of the body. | |
caf07df9 | 1509 | |
f99ff327 | 1510 | Analyze_Entry_Or_Subprogram_Body_Contract (Body_Id); |
caf07df9 AC |
1511 | |
1512 | Analyze (Handled_Statement_Sequence (N)); | |
996ae0b0 RK |
1513 | Save_Global_References (Original_Node (N)); |
1514 | ||
82c80734 RD |
1515 | -- Prior to exiting the scope, include generic formals again (if any |
1516 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1517 | |
1518 | if Present (First_Ent) then | |
1519 | Set_First_Entity (Gen_Id, First_Ent); | |
1520 | end if; | |
1521 | ||
fbf5a39b | 1522 | Check_References (Gen_Id); |
996ae0b0 RK |
1523 | end; |
1524 | ||
e6f69614 | 1525 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
851e9f19 | 1526 | Update_Use_Clause_Chain; |
3e5400f4 | 1527 | Validate_Categorization_Dependency (N, Gen_Id); |
996ae0b0 RK |
1528 | End_Scope; |
1529 | Check_Subprogram_Order (N); | |
1530 | ||
e895b435 | 1531 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1532 | |
1533 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1534 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1535 | |
1536 | if Style_Check then | |
1537 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1538 | end if; | |
13d923cc | 1539 | |
996ae0b0 | 1540 | End_Generic; |
996ae0b0 RK |
1541 | end Analyze_Generic_Subprogram_Body; |
1542 | ||
4d8f3296 ES |
1543 | ---------------------------- |
1544 | -- Analyze_Null_Procedure -- | |
1545 | ---------------------------- | |
1546 | ||
a2c54c95 HK |
1547 | -- WARNING: This routine manages Ghost regions. Return statements must be |
1548 | -- replaced by gotos that jump to the end of the routine and restore the | |
1549 | -- Ghost mode. | |
1550 | ||
4d8f3296 ES |
1551 | procedure Analyze_Null_Procedure |
1552 | (N : Node_Id; | |
1553 | Is_Completion : out Boolean) | |
1554 | is | |
a2c54c95 HK |
1555 | Loc : constant Source_Ptr := Sloc (N); |
1556 | Spec : constant Node_Id := Specification (N); | |
1557 | ||
1558 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; | |
1559 | Saved_IGR : constant Node_Id := Ignored_Ghost_Region; | |
1560 | Saved_ISMP : constant Boolean := | |
1561 | Ignore_SPARK_Mode_Pragmas_In_Instance; | |
1562 | -- Save the Ghost and SPARK mode-related data to restore on exit | |
1563 | ||
4d8f3296 ES |
1564 | Designator : Entity_Id; |
1565 | Form : Node_Id; | |
1566 | Null_Body : Node_Id := Empty; | |
b912db16 | 1567 | Null_Stmt : Node_Id := Null_Statement (Spec); |
4d8f3296 ES |
1568 | Prev : Entity_Id; |
1569 | ||
1570 | begin | |
a2c54c95 HK |
1571 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); |
1572 | ||
1573 | -- A null procedure is Ghost when it is stand-alone and is subject to | |
1574 | -- pragma Ghost, or when the corresponding spec is Ghost. Set the mode | |
1575 | -- now, to ensure that any nodes generated during analysis and expansion | |
1576 | -- are properly marked as Ghost. | |
1577 | ||
1578 | if Present (Prev) then | |
1579 | Mark_And_Set_Ghost_Body (N, Prev); | |
1580 | end if; | |
1581 | ||
4d8f3296 ES |
1582 | -- Capture the profile of the null procedure before analysis, for |
1583 | -- expansion at the freeze point and at each point of call. The body is | |
1584 | -- used if the procedure has preconditions, or if it is a completion. In | |
1585 | -- the first case the body is analyzed at the freeze point, in the other | |
1586 | -- it replaces the null procedure declaration. | |
1587 | ||
b912db16 AC |
1588 | -- For a null procedure that comes from source, a NULL statement is |
1589 | -- provided by the parser, which carries the source location of the | |
1590 | -- NULL keyword, and has Comes_From_Source set. For a null procedure | |
1591 | -- from expansion, create one now. | |
1592 | ||
1593 | if No (Null_Stmt) then | |
1594 | Null_Stmt := Make_Null_Statement (Loc); | |
1595 | end if; | |
1596 | ||
4d8f3296 ES |
1597 | Null_Body := |
1598 | Make_Subprogram_Body (Loc, | |
611d5e3c AC |
1599 | Specification => New_Copy_Tree (Spec), |
1600 | Declarations => New_List, | |
4d8f3296 ES |
1601 | Handled_Statement_Sequence => |
1602 | Make_Handled_Sequence_Of_Statements (Loc, | |
b912db16 | 1603 | Statements => New_List (Null_Stmt))); |
4d8f3296 ES |
1604 | |
1605 | -- Create new entities for body and formals | |
1606 | ||
1607 | Set_Defining_Unit_Name (Specification (Null_Body), | |
9d2a2071 AC |
1608 | Make_Defining_Identifier |
1609 | (Sloc (Defining_Entity (N)), | |
1610 | Chars (Defining_Entity (N)))); | |
4d8f3296 ES |
1611 | |
1612 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1613 | while Present (Form) loop | |
1614 | Set_Defining_Identifier (Form, | |
9d2a2071 AC |
1615 | Make_Defining_Identifier |
1616 | (Sloc (Defining_Identifier (Form)), | |
1617 | Chars (Defining_Identifier (Form)))); | |
4d8f3296 ES |
1618 | Next (Form); |
1619 | end loop; | |
1620 | ||
1621 | -- Determine whether the null procedure may be a completion of a generic | |
1622 | -- suprogram, in which case we use the new null body as the completion | |
1623 | -- and set minimal semantic information on the original declaration, | |
1624 | -- which is rewritten as a null statement. | |
1625 | ||
4d8f3296 ES |
1626 | if Present (Prev) and then Is_Generic_Subprogram (Prev) then |
1627 | Insert_Before (N, Null_Body); | |
1628 | Set_Ekind (Defining_Entity (N), Ekind (Prev)); | |
4d8f3296 ES |
1629 | |
1630 | Rewrite (N, Make_Null_Statement (Loc)); | |
1631 | Analyze_Generic_Subprogram_Body (Null_Body, Prev); | |
1632 | Is_Completion := True; | |
a2c54c95 HK |
1633 | |
1634 | goto Leave; | |
4d8f3296 ES |
1635 | |
1636 | else | |
611d5e3c AC |
1637 | -- Resolve the types of the formals now, because the freeze point may |
1638 | -- appear in a different context, e.g. an instantiation. | |
4d8f3296 ES |
1639 | |
1640 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1641 | while Present (Form) loop | |
1642 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
1643 | Find_Type (Parameter_Type (Form)); | |
1644 | ||
611d5e3c AC |
1645 | elsif No (Access_To_Subprogram_Definition |
1646 | (Parameter_Type (Form))) | |
4d8f3296 ES |
1647 | then |
1648 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
1649 | ||
611d5e3c AC |
1650 | -- The case of a null procedure with a formal that is an |
1651 | -- access-to-subprogram type, and that is used as an actual | |
1652 | -- in an instantiation is left to the enthusiastic reader. | |
4d8f3296 | 1653 | |
611d5e3c | 1654 | else |
4d8f3296 ES |
1655 | null; |
1656 | end if; | |
1657 | ||
1658 | Next (Form); | |
1659 | end loop; | |
1660 | end if; | |
1661 | ||
611d5e3c AC |
1662 | -- If there are previous overloadable entities with the same name, check |
1663 | -- whether any of them is completed by the null procedure. | |
4d8f3296 ES |
1664 | |
1665 | if Present (Prev) and then Is_Overloadable (Prev) then | |
1666 | Designator := Analyze_Subprogram_Specification (Spec); | |
1667 | Prev := Find_Corresponding_Spec (N); | |
1668 | end if; | |
1669 | ||
1670 | if No (Prev) or else not Comes_From_Source (Prev) then | |
1671 | Designator := Analyze_Subprogram_Specification (Spec); | |
1672 | Set_Has_Completion (Designator); | |
1673 | ||
1674 | -- Signal to caller that this is a procedure declaration | |
1675 | ||
1676 | Is_Completion := False; | |
1677 | ||
1678 | -- Null procedures are always inlined, but generic formal subprograms | |
1679 | -- which appear as such in the internal instance of formal packages, | |
1680 | -- need no completion and are not marked Inline. | |
1681 | ||
1682 | if Expander_Active | |
1683 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
1684 | then | |
a6354842 | 1685 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); |
4d8f3296 ES |
1686 | Set_Body_To_Inline (N, Null_Body); |
1687 | Set_Is_Inlined (Designator); | |
1688 | end if; | |
1689 | ||
1690 | else | |
2fe258bf AC |
1691 | -- The null procedure is a completion. We unconditionally rewrite |
1692 | -- this as a null body (even if expansion is not active), because | |
1693 | -- there are various error checks that are applied on this body | |
1694 | -- when it is analyzed (e.g. correct aspect placement). | |
4d8f3296 | 1695 | |
c23c86bb | 1696 | if Has_Completion (Prev) then |
a98480dd AC |
1697 | Error_Msg_Sloc := Sloc (Prev); |
1698 | Error_Msg_NE ("duplicate body for & declared#", N, Prev); | |
1699 | end if; | |
1700 | ||
8489c295 AC |
1701 | Check_Previous_Null_Procedure (N, Prev); |
1702 | ||
4d8f3296 | 1703 | Is_Completion := True; |
2fe258bf AC |
1704 | Rewrite (N, Null_Body); |
1705 | Analyze (N); | |
4d8f3296 | 1706 | end if; |
a2c54c95 HK |
1707 | |
1708 | <<Leave>> | |
1709 | Ignore_SPARK_Mode_Pragmas_In_Instance := Saved_ISMP; | |
1710 | Restore_Ghost_Region (Saved_GM, Saved_IGR); | |
4d8f3296 ES |
1711 | end Analyze_Null_Procedure; |
1712 | ||
996ae0b0 RK |
1713 | ----------------------------- |
1714 | -- Analyze_Operator_Symbol -- | |
1715 | ----------------------------- | |
1716 | ||
82c80734 RD |
1717 | -- An operator symbol such as "+" or "and" may appear in context where the |
1718 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1719 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1720 | -- generates this node, and the semantics does the disambiguation. Other | |
1721 | -- such case are actuals in an instantiation, the generic unit in an | |
1722 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1723 | |
1724 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1725 | Par : constant Node_Id := Parent (N); | |
1726 | ||
1727 | begin | |
1f0b1e48 | 1728 | if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
996ae0b0 | 1729 | or else Nkind (Par) = N_Function_Instantiation |
1f0b1e48 | 1730 | or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
996ae0b0 | 1731 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1f0b1e48 | 1732 | and then not Is_Pragma_String_Literal (Par)) |
996ae0b0 | 1733 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
800621e0 RD |
1734 | or else (Nkind (Par) = N_Attribute_Reference |
1735 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1736 | then |
1737 | Find_Direct_Name (N); | |
1738 | ||
1739 | else | |
1740 | Change_Operator_Symbol_To_String_Literal (N); | |
1741 | Analyze (N); | |
1742 | end if; | |
1743 | end Analyze_Operator_Symbol; | |
1744 | ||
1745 | ----------------------------------- | |
1746 | -- Analyze_Parameter_Association -- | |
1747 | ----------------------------------- | |
1748 | ||
1749 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1750 | begin | |
1751 | Analyze (Explicit_Actual_Parameter (N)); | |
1752 | end Analyze_Parameter_Association; | |
1753 | ||
1754 | ---------------------------- | |
1755 | -- Analyze_Procedure_Call -- | |
1756 | ---------------------------- | |
1757 | ||
b0bf18ad | 1758 | -- WARNING: This routine manages Ghost regions. Return statements must be |
a2c54c95 | 1759 | -- replaced by gotos that jump to the end of the routine and restore the |
b0bf18ad AC |
1760 | -- Ghost mode. |
1761 | ||
996ae0b0 | 1762 | procedure Analyze_Procedure_Call (N : Node_Id) is |
996ae0b0 | 1763 | procedure Analyze_Call_And_Resolve; |
b0bf18ad AC |
1764 | -- Do Analyze and Resolve calls for procedure call. At the end, check |
1765 | -- for illegal order dependence. | |
1766 | -- ??? where is the check for illegal order dependencies? | |
996ae0b0 | 1767 | |
fbf5a39b AC |
1768 | ------------------------------ |
1769 | -- Analyze_Call_And_Resolve -- | |
1770 | ------------------------------ | |
1771 | ||
996ae0b0 RK |
1772 | procedure Analyze_Call_And_Resolve is |
1773 | begin | |
1774 | if Nkind (N) = N_Procedure_Call_Statement then | |
1775 | Analyze_Call (N); | |
1776 | Resolve (N, Standard_Void_Type); | |
1777 | else | |
1778 | Analyze (N); | |
1779 | end if; | |
1780 | end Analyze_Call_And_Resolve; | |
1781 | ||
241ebe89 HK |
1782 | -- Local variables |
1783 | ||
1784 | Actuals : constant List_Id := Parameter_Associations (N); | |
1785 | Loc : constant Source_Ptr := Sloc (N); | |
1786 | P : constant Node_Id := Name (N); | |
f9a8f910 | 1787 | |
9057bd6a HK |
1788 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
1789 | Saved_IGR : constant Node_Id := Ignored_Ghost_Region; | |
1790 | -- Save the Ghost-related attributes to restore on exit | |
f9a8f910 HK |
1791 | |
1792 | Actual : Node_Id; | |
1793 | New_N : Node_Id; | |
241ebe89 | 1794 | |
996ae0b0 RK |
1795 | -- Start of processing for Analyze_Procedure_Call |
1796 | ||
1797 | begin | |
1798 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1799 | -- a procedure call or an entry call. The prefix may denote an access | |
1800 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1801 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1802 | -- then the construct denotes a call to a member of an entire family. |
1803 | -- If the prefix is a simple name, it may still denote a call to a | |
1804 | -- parameterless member of an entry family. Resolution of these various | |
1805 | -- interpretations is delicate. | |
1806 | ||
0fe797c5 SB |
1807 | -- Do not analyze machine code statements to avoid rejecting them in |
1808 | -- CodePeer mode. | |
996ae0b0 | 1809 | |
0fe797c5 SB |
1810 | if CodePeer_Mode and then Nkind (P) = N_Qualified_Expression then |
1811 | Set_Etype (P, Standard_Void_Type); | |
1812 | else | |
1813 | Analyze (P); | |
1814 | end if; | |
1815 | ||
1816 | -- If this is a call of the form Obj.Op, the call may have been analyzed | |
1817 | -- and possibly rewritten into a block, in which case we are done. | |
758c442c GD |
1818 | |
1819 | if Analyzed (N) then | |
1820 | return; | |
758c442c | 1821 | |
7415029d AC |
1822 | -- If there is an error analyzing the name (which may have been |
1823 | -- rewritten if the original call was in prefix notation) then error | |
1824 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1825 | |
90e491a7 | 1826 | elsif Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
996ae0b0 RK |
1827 | Set_Etype (N, Any_Type); |
1828 | return; | |
1829 | end if; | |
1830 | ||
1af4455a HK |
1831 | -- A procedure call is Ghost when its name denotes a Ghost procedure. |
1832 | -- Set the mode now to ensure that any nodes generated during analysis | |
1833 | -- and expansion are properly marked as Ghost. | |
8636f52f | 1834 | |
f9a8f910 | 1835 | Mark_And_Set_Ghost_Procedure_Call (N); |
8636f52f | 1836 | |
996ae0b0 RK |
1837 | -- Otherwise analyze the parameters |
1838 | ||
1839 | if Present (Actuals) then | |
1840 | Actual := First (Actuals); | |
1841 | ||
1842 | while Present (Actual) loop | |
1843 | Analyze (Actual); | |
1844 | Check_Parameterless_Call (Actual); | |
1845 | Next (Actual); | |
1846 | end loop; | |
1847 | end if; | |
1848 | ||
0bfc9a64 | 1849 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1850 | |
1851 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a AC |
1852 | and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
1853 | Name_Elab_Body, | |
1854 | Name_Elab_Subp_Body) | |
996ae0b0 RK |
1855 | then |
1856 | if Present (Actuals) then | |
1857 | Error_Msg_N | |
1858 | ("no parameters allowed for this call", First (Actuals)); | |
d65a80fd | 1859 | goto Leave; |
996ae0b0 RK |
1860 | end if; |
1861 | ||
1862 | Set_Etype (N, Standard_Void_Type); | |
1863 | Set_Analyzed (N); | |
1864 | ||
1865 | elsif Is_Entity_Name (P) | |
1866 | and then Is_Record_Type (Etype (Entity (P))) | |
1867 | and then Remote_AST_I_Dereference (P) | |
1868 | then | |
d65a80fd | 1869 | goto Leave; |
996ae0b0 RK |
1870 | |
1871 | elsif Is_Entity_Name (P) | |
1872 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1873 | then | |
1874 | if Is_Access_Type (Etype (P)) | |
1875 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1876 | and then No (Actuals) | |
1877 | and then Comes_From_Source (N) | |
1878 | then | |
ed2233dc | 1879 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1880 | end if; |
1881 | ||
1882 | Analyze_Call_And_Resolve; | |
1883 | ||
0fe797c5 SB |
1884 | -- If the prefix is the simple name of an entry family, this is a |
1885 | -- parameterless call from within the task body itself. | |
996ae0b0 RK |
1886 | |
1887 | elsif Is_Entity_Name (P) | |
1888 | and then Nkind (P) = N_Identifier | |
1889 | and then Ekind (Entity (P)) = E_Entry_Family | |
1890 | and then Present (Actuals) | |
1891 | and then No (Next (First (Actuals))) | |
1892 | then | |
82c80734 RD |
1893 | -- Can be call to parameterless entry family. What appears to be the |
1894 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1895 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1896 | -- transformation. |
1897 | ||
1898 | New_N := | |
1899 | Make_Indexed_Component (Loc, | |
90e491a7 | 1900 | Prefix => |
996ae0b0 | 1901 | Make_Selected_Component (Loc, |
90e491a7 | 1902 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), |
996ae0b0 RK |
1903 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), |
1904 | Expressions => Actuals); | |
1905 | Set_Name (N, New_N); | |
1906 | Set_Etype (New_N, Standard_Void_Type); | |
1907 | Set_Parameter_Associations (N, No_List); | |
1908 | Analyze_Call_And_Resolve; | |
1909 | ||
1910 | elsif Nkind (P) = N_Explicit_Dereference then | |
1911 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1912 | Analyze_Call_And_Resolve; | |
1913 | else | |
1914 | Error_Msg_N ("expect access to procedure in call", P); | |
1915 | end if; | |
1916 | ||
82c80734 RD |
1917 | -- The name can be a selected component or an indexed component that |
1918 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1919 | -- has parameter associations. | |
996ae0b0 RK |
1920 | |
1921 | elsif Is_Access_Type (Etype (P)) | |
1922 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1923 | then | |
1924 | if Present (Actuals) then | |
1925 | Analyze_Call_And_Resolve; | |
1926 | else | |
ed2233dc | 1927 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1928 | end if; |
1929 | ||
82c80734 RD |
1930 | -- If not an access to subprogram, then the prefix must resolve to the |
1931 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1932 | |
82c80734 RD |
1933 | -- For the case of a simple entry call, P is a selected component where |
1934 | -- the prefix is the task and the selector name is the entry. A call to | |
1935 | -- a protected procedure will have the same syntax. If the protected | |
1936 | -- object contains overloaded operations, the entity may appear as a | |
1937 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1938 | |
1939 | elsif Nkind (P) = N_Selected_Component | |
8fde064e | 1940 | and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
d8f43ee6 HK |
1941 | E_Function, |
1942 | E_Procedure) | |
996ae0b0 | 1943 | then |
0929d66b AC |
1944 | -- When front-end inlining is enabled, as with SPARK_Mode, a call |
1945 | -- in prefix notation may still be missing its controlling argument, | |
1946 | -- so perform the transformation now. | |
1947 | ||
1948 | if SPARK_Mode = On and then In_Inlined_Body then | |
1949 | declare | |
1950 | Subp : constant Entity_Id := Entity (Selector_Name (P)); | |
1951 | Typ : constant Entity_Id := Etype (Prefix (P)); | |
1952 | ||
1953 | begin | |
1954 | if Is_Tagged_Type (Typ) | |
1955 | and then Present (First_Formal (Subp)) | |
e3822b0a YM |
1956 | and then (Etype (First_Formal (Subp)) = Typ |
1957 | or else | |
1958 | Class_Wide_Type (Etype (First_Formal (Subp))) = Typ) | |
0929d66b AC |
1959 | and then Try_Object_Operation (P) |
1960 | then | |
1961 | return; | |
1962 | ||
1963 | else | |
1964 | Analyze_Call_And_Resolve; | |
1965 | end if; | |
1966 | end; | |
1967 | ||
1968 | else | |
1969 | Analyze_Call_And_Resolve; | |
1970 | end if; | |
996ae0b0 RK |
1971 | |
1972 | elsif Nkind (P) = N_Selected_Component | |
1973 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1974 | and then Present (Actuals) | |
1975 | and then No (Next (First (Actuals))) | |
1976 | then | |
82c80734 RD |
1977 | -- Can be call to parameterless entry family. What appears to be the |
1978 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1979 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1980 | -- transformation. |
1981 | ||
1982 | New_N := | |
1983 | Make_Indexed_Component (Loc, | |
d8f43ee6 | 1984 | Prefix => New_Copy (P), |
996ae0b0 RK |
1985 | Expressions => Actuals); |
1986 | Set_Name (N, New_N); | |
1987 | Set_Etype (New_N, Standard_Void_Type); | |
1988 | Set_Parameter_Associations (N, No_List); | |
1989 | Analyze_Call_And_Resolve; | |
1990 | ||
1991 | -- For the case of a reference to an element of an entry family, P is | |
1992 | -- an indexed component whose prefix is a selected component (task and | |
1993 | -- entry family), and whose index is the entry family index. | |
1994 | ||
1995 | elsif Nkind (P) = N_Indexed_Component | |
1996 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1997 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1998 | then | |
1999 | Analyze_Call_And_Resolve; | |
2000 | ||
2001 | -- If the prefix is the name of an entry family, it is a call from | |
2002 | -- within the task body itself. | |
2003 | ||
2004 | elsif Nkind (P) = N_Indexed_Component | |
2005 | and then Nkind (Prefix (P)) = N_Identifier | |
2006 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
2007 | then | |
2008 | New_N := | |
2009 | Make_Selected_Component (Loc, | |
90e491a7 PMR |
2010 | Prefix => |
2011 | New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
996ae0b0 RK |
2012 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); |
2013 | Rewrite (Prefix (P), New_N); | |
2014 | Analyze (P); | |
2015 | Analyze_Call_And_Resolve; | |
2016 | ||
9f8d1e5c AC |
2017 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
2018 | -- procedure name, so the construct can only be a qualified expression. | |
2019 | ||
2020 | elsif Nkind (P) = N_Qualified_Expression | |
2021 | and then Ada_Version >= Ada_2012 | |
2022 | then | |
2023 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
2024 | Analyze (N); | |
2025 | ||
e895b435 | 2026 | -- Anything else is an error |
996ae0b0 RK |
2027 | |
2028 | else | |
758c442c | 2029 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 | 2030 | end if; |
241ebe89 | 2031 | |
d65a80fd | 2032 | <<Leave>> |
9057bd6a | 2033 | Restore_Ghost_Region (Saved_GM, Saved_IGR); |
996ae0b0 RK |
2034 | end Analyze_Procedure_Call; |
2035 | ||
b0186f71 AC |
2036 | ------------------------------ |
2037 | -- Analyze_Return_Statement -- | |
2038 | ------------------------------ | |
2039 | ||
2040 | procedure Analyze_Return_Statement (N : Node_Id) is | |
d65a80fd HK |
2041 | pragma Assert (Nkind_In (N, N_Extended_Return_Statement, |
2042 | N_Simple_Return_Statement)); | |
b0186f71 AC |
2043 | |
2044 | Returns_Object : constant Boolean := | |
2045 | Nkind (N) = N_Extended_Return_Statement | |
2046 | or else | |
8fde064e AC |
2047 | (Nkind (N) = N_Simple_Return_Statement |
2048 | and then Present (Expression (N))); | |
b0186f71 AC |
2049 | -- True if we're returning something; that is, "return <expression>;" |
2050 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
2051 | -- checking: If Returns_Object is True, N should apply to a function | |
2052 | -- body; otherwise N should apply to a procedure body, entry body, | |
2053 | -- accept statement, or extended return statement. | |
2054 | ||
2055 | function Find_What_It_Applies_To return Entity_Id; | |
2056 | -- Find the entity representing the innermost enclosing body, accept | |
2057 | -- statement, or extended return statement. If the result is a callable | |
2058 | -- construct or extended return statement, then this will be the value | |
2059 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
2060 | -- illegal. See RM-6.5(4/2). | |
2061 | ||
2062 | ----------------------------- | |
2063 | -- Find_What_It_Applies_To -- | |
2064 | ----------------------------- | |
2065 | ||
2066 | function Find_What_It_Applies_To return Entity_Id is | |
2067 | Result : Entity_Id := Empty; | |
2068 | ||
2069 | begin | |
36b8f95f AC |
2070 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
2071 | -- and postconditions. | |
b0186f71 AC |
2072 | |
2073 | for J in reverse 0 .. Scope_Stack.Last loop | |
2074 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
2075 | exit when not Ekind_In (Result, E_Block, E_Loop) |
2076 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
2077 | end loop; |
2078 | ||
2079 | pragma Assert (Present (Result)); | |
2080 | return Result; | |
2081 | end Find_What_It_Applies_To; | |
2082 | ||
2083 | -- Local declarations | |
2084 | ||
2085 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
2086 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
2087 | Loc : constant Source_Ptr := Sloc (N); | |
2088 | Stm_Entity : constant Entity_Id := | |
2089 | New_Internal_Entity | |
2090 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
2091 | ||
2092 | -- Start of processing for Analyze_Return_Statement | |
2093 | ||
2094 | begin | |
2095 | Set_Return_Statement_Entity (N, Stm_Entity); | |
2096 | ||
2097 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
2098 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
2099 | ||
2100 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
2101 | -- (4/2): an inner return statement will apply to this extended return. | |
2102 | ||
2103 | if Nkind (N) = N_Extended_Return_Statement then | |
2104 | Push_Scope (Stm_Entity); | |
2105 | end if; | |
2106 | ||
2107 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
2108 | -- implicitly-generated return that is placed at the end. | |
2109 | ||
2110 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
2111 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
2112 | end if; | |
2113 | ||
2114 | -- Warn on any unassigned OUT parameters if in procedure | |
2115 | ||
2116 | if Ekind (Scope_Id) = E_Procedure then | |
2117 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
2118 | end if; | |
2119 | ||
2120 | -- Check that functions return objects, and other things do not | |
2121 | ||
2122 | if Kind = E_Function or else Kind = E_Generic_Function then | |
2123 | if not Returns_Object then | |
2124 | Error_Msg_N ("missing expression in return from function", N); | |
2125 | end if; | |
2126 | ||
2127 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
2128 | if Returns_Object then | |
2129 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
2130 | end if; | |
2131 | ||
2132 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
2133 | if Returns_Object then | |
2134 | if Is_Protected_Type (Scope (Scope_Id)) then | |
2135 | Error_Msg_N ("entry body cannot return value", N); | |
2136 | else | |
2137 | Error_Msg_N ("accept statement cannot return value", N); | |
2138 | end if; | |
2139 | end if; | |
2140 | ||
2141 | elsif Kind = E_Return_Statement then | |
2142 | ||
2143 | -- We are nested within another return statement, which must be an | |
2144 | -- extended_return_statement. | |
2145 | ||
2146 | if Returns_Object then | |
d0dcb2b1 AC |
2147 | if Nkind (N) = N_Extended_Return_Statement then |
2148 | Error_Msg_N | |
cc96a1b8 | 2149 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
2150 | N); |
2151 | ||
2152 | -- Case of a simple return statement with a value inside extended | |
2153 | -- return statement. | |
2154 | ||
2155 | else | |
2156 | Error_Msg_N | |
3ccedacc AC |
2157 | ("return nested in extended return statement cannot return " |
2158 | & "value (use `RETURN;`)", N); | |
d0dcb2b1 | 2159 | end if; |
b0186f71 AC |
2160 | end if; |
2161 | ||
2162 | else | |
2163 | Error_Msg_N ("illegal context for return statement", N); | |
2164 | end if; | |
2165 | ||
2166 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
2167 | Analyze_Function_Return (N); | |
2168 | ||
2169 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
2170 | Set_Return_Present (Scope_Id); | |
2171 | end if; | |
2172 | ||
2173 | if Nkind (N) = N_Extended_Return_Statement then | |
2174 | End_Scope; | |
2175 | end if; | |
2176 | ||
2177 | Kill_Current_Values (Last_Assignment_Only => True); | |
2178 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
2179 | |
2180 | Analyze_Dimension (N); | |
b0186f71 AC |
2181 | end Analyze_Return_Statement; |
2182 | ||
5d37ba92 ES |
2183 | ------------------------------------- |
2184 | -- Analyze_Simple_Return_Statement -- | |
2185 | ------------------------------------- | |
ec4867fa | 2186 | |
5d37ba92 | 2187 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 2188 | begin |
5d37ba92 ES |
2189 | if Present (Expression (N)) then |
2190 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
2191 | end if; |
2192 | ||
5d37ba92 ES |
2193 | Analyze_Return_Statement (N); |
2194 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 2195 | |
82c80734 RD |
2196 | ------------------------- |
2197 | -- Analyze_Return_Type -- | |
2198 | ------------------------- | |
2199 | ||
2200 | procedure Analyze_Return_Type (N : Node_Id) is | |
2201 | Designator : constant Entity_Id := Defining_Entity (N); | |
2202 | Typ : Entity_Id := Empty; | |
2203 | ||
2204 | begin | |
ec4867fa ES |
2205 | -- Normal case where result definition does not indicate an error |
2206 | ||
41251c60 JM |
2207 | if Result_Definition (N) /= Error then |
2208 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
ce5ba43a | 2209 | Check_SPARK_05_Restriction |
fe5d3068 | 2210 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 2211 | |
b1c11e0e JM |
2212 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
2213 | ||
2214 | declare | |
2215 | AD : constant Node_Id := | |
2216 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
2217 | begin | |
2218 | if Present (AD) and then Protected_Present (AD) then | |
2219 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
2220 | else | |
2221 | Typ := Access_Definition (N, Result_Definition (N)); | |
2222 | end if; | |
2223 | end; | |
2224 | ||
41251c60 JM |
2225 | Set_Parent (Typ, Result_Definition (N)); |
2226 | Set_Is_Local_Anonymous_Access (Typ); | |
2227 | Set_Etype (Designator, Typ); | |
2228 | ||
b66c3ff4 AC |
2229 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
2230 | ||
2231 | Null_Exclusion_Static_Checks (N); | |
2232 | ||
41251c60 JM |
2233 | -- Subtype_Mark case |
2234 | ||
2235 | else | |
2236 | Find_Type (Result_Definition (N)); | |
2237 | Typ := Entity (Result_Definition (N)); | |
2238 | Set_Etype (Designator, Typ); | |
2239 | ||
2ba431e5 | 2240 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 2241 | |
8fde064e | 2242 | if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
ce5ba43a | 2243 | Check_SPARK_05_Restriction |
fe5d3068 | 2244 | ("returning an unconstrained array is not allowed", |
7394c8cc | 2245 | Result_Definition (N)); |
daec8eeb YM |
2246 | end if; |
2247 | ||
b66c3ff4 AC |
2248 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
2249 | ||
2250 | Null_Exclusion_Static_Checks (N); | |
2251 | ||
2252 | -- If a null exclusion is imposed on the result type, then create | |
2253 | -- a null-excluding itype (an access subtype) and use it as the | |
2254 | -- function's Etype. Note that the null exclusion checks are done | |
2255 | -- right before this, because they don't get applied to types that | |
2256 | -- do not come from source. | |
2257 | ||
8fde064e | 2258 | if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
b66c3ff4 AC |
2259 | Set_Etype (Designator, |
2260 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
2261 | (T => Typ, |
2262 | Related_Nod => N, | |
2263 | Scope_Id => Scope (Current_Scope))); | |
2264 | ||
2265 | -- The new subtype must be elaborated before use because | |
2266 | -- it is visible outside of the function. However its base | |
2267 | -- type may not be frozen yet, so the reference that will | |
2268 | -- force elaboration must be attached to the freezing of | |
2269 | -- the base type. | |
2270 | ||
212863c0 AC |
2271 | -- If the return specification appears on a proper body, |
2272 | -- the subtype will have been created already on the spec. | |
2273 | ||
ff7139c3 | 2274 | if Is_Frozen (Typ) then |
212863c0 AC |
2275 | if Nkind (Parent (N)) = N_Subprogram_Body |
2276 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
2277 | then | |
2278 | null; | |
2279 | else | |
2280 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
2281 | end if; | |
2282 | ||
ff7139c3 AC |
2283 | else |
2284 | Ensure_Freeze_Node (Typ); | |
2285 | ||
2286 | declare | |
212863c0 | 2287 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
2288 | begin |
2289 | Set_Itype (IR, Etype (Designator)); | |
2290 | Append_Freeze_Actions (Typ, New_List (IR)); | |
2291 | end; | |
2292 | end if; | |
2293 | ||
b66c3ff4 AC |
2294 | else |
2295 | Set_Etype (Designator, Typ); | |
2296 | end if; | |
2297 | ||
41251c60 JM |
2298 | if Ekind (Typ) = E_Incomplete_Type |
2299 | or else (Is_Class_Wide_Type (Typ) | |
4b6f99f5 | 2300 | and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
41251c60 | 2301 | then |
dd386db0 AC |
2302 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
2303 | -- parts. Untagged incomplete types are not allowed in bodies. | |
b973629e AC |
2304 | -- As a consequence, limited views cannot appear in a basic |
2305 | -- declaration that is itself within a body, because there is | |
2306 | -- no point at which the non-limited view will become visible. | |
dd386db0 AC |
2307 | |
2308 | if Ada_Version >= Ada_2012 then | |
b973629e AC |
2309 | if From_Limited_With (Typ) and then In_Package_Body then |
2310 | Error_Msg_NE | |
2311 | ("invalid use of incomplete type&", | |
3f80a182 | 2312 | Result_Definition (N), Typ); |
b973629e | 2313 | |
1ebc2612 AC |
2314 | -- The return type of a subprogram body cannot be of a |
2315 | -- formal incomplete type. | |
2316 | ||
2317 | elsif Is_Generic_Type (Typ) | |
2318 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2319 | then | |
2320 | Error_Msg_N | |
2321 | ("return type cannot be a formal incomplete type", | |
2322 | Result_Definition (N)); | |
2323 | ||
2324 | elsif Is_Class_Wide_Type (Typ) | |
2325 | and then Is_Generic_Type (Root_Type (Typ)) | |
2326 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2327 | then | |
2328 | Error_Msg_N | |
2329 | ("return type cannot be a formal incomplete type", | |
2330 | Result_Definition (N)); | |
2331 | ||
b973629e | 2332 | elsif Is_Tagged_Type (Typ) then |
dd386db0 AC |
2333 | null; |
2334 | ||
ed09416f AC |
2335 | -- Use is legal in a thunk generated for an operation |
2336 | -- inherited from a progenitor. | |
2337 | ||
2338 | elsif Is_Thunk (Designator) | |
2339 | and then Present (Non_Limited_View (Typ)) | |
2340 | then | |
2341 | null; | |
2342 | ||
5b6f12c7 | 2343 | elsif Nkind (Parent (N)) = N_Subprogram_Body |
31d922e3 AC |
2344 | or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
2345 | N_Entry_Body) | |
dd386db0 AC |
2346 | then |
2347 | Error_Msg_NE | |
2348 | ("invalid use of untagged incomplete type&", | |
2349 | Designator, Typ); | |
2350 | end if; | |
2351 | ||
63be2a5a | 2352 | -- The type must be completed in the current package. This |
31d922e3 | 2353 | -- is checked at the end of the package declaration when |
7b7a0c2b AC |
2354 | -- Taft-amendment types are identified. If the return type |
2355 | -- is class-wide, there is no required check, the type can | |
2356 | -- be a bona fide TAT. | |
63be2a5a AC |
2357 | |
2358 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 2359 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 2360 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
2361 | then |
2362 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
2363 | end if; | |
2364 | ||
dd386db0 AC |
2365 | else |
2366 | Error_Msg_NE | |
2367 | ("invalid use of incomplete type&", Designator, Typ); | |
2368 | end if; | |
41251c60 | 2369 | end if; |
82c80734 RD |
2370 | end if; |
2371 | ||
ec4867fa ES |
2372 | -- Case where result definition does indicate an error |
2373 | ||
82c80734 RD |
2374 | else |
2375 | Set_Etype (Designator, Any_Type); | |
2376 | end if; | |
2377 | end Analyze_Return_Type; | |
2378 | ||
996ae0b0 RK |
2379 | ----------------------------- |
2380 | -- Analyze_Subprogram_Body -- | |
2381 | ----------------------------- | |
2382 | ||
b1b543d2 BD |
2383 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
2384 | Loc : constant Source_Ptr := Sloc (N); | |
2385 | Body_Spec : constant Node_Id := Specification (N); | |
2386 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
2387 | ||
2388 | begin | |
2389 | if Debug_Flag_C then | |
2390 | Write_Str ("==> subprogram body "); | |
2391 | Write_Name (Chars (Body_Id)); | |
2392 | Write_Str (" from "); | |
2393 | Write_Location (Loc); | |
2394 | Write_Eol; | |
2395 | Indent; | |
2396 | end if; | |
2397 | ||
2398 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
2399 | ||
2400 | -- The real work is split out into the helper, so it can do "return;" | |
2401 | -- without skipping the debug output: | |
2402 | ||
2403 | Analyze_Subprogram_Body_Helper (N); | |
2404 | ||
2405 | if Debug_Flag_C then | |
2406 | Outdent; | |
2407 | Write_Str ("<== subprogram body "); | |
2408 | Write_Name (Chars (Body_Id)); | |
2409 | Write_Str (" from "); | |
2410 | Write_Location (Loc); | |
2411 | Write_Eol; | |
2412 | end if; | |
2413 | end Analyze_Subprogram_Body; | |
2414 | ||
2415 | ------------------------------------ | |
2416 | -- Analyze_Subprogram_Body_Helper -- | |
2417 | ------------------------------------ | |
2418 | ||
996ae0b0 RK |
2419 | -- This procedure is called for regular subprogram bodies, generic bodies, |
2420 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
2421 | -- specification matters, and is used to create a proper declaration for | |
2422 | -- the subprogram, or to perform conformance checks. | |
2423 | ||
b0bf18ad | 2424 | -- WARNING: This routine manages Ghost regions. Return statements must be |
a2c54c95 | 2425 | -- replaced by gotos that jump to the end of the routine and restore the |
b0bf18ad AC |
2426 | -- Ghost mode. |
2427 | ||
b1b543d2 | 2428 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
d030f3a4 AC |
2429 | Body_Spec : Node_Id := Specification (N); |
2430 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
2431 | Loc : constant Source_Ptr := Sloc (N); | |
2432 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
2433 | ||
2434 | Conformant : Boolean; | |
2435 | Desig_View : Entity_Id := Empty; | |
2436 | Exch_Views : Elist_Id := No_Elist; | |
2437 | HSS : Node_Id; | |
a83d0680 | 2438 | Mask_Types : Elist_Id := No_Elist; |
d030f3a4 AC |
2439 | Prot_Typ : Entity_Id := Empty; |
2440 | Spec_Decl : Node_Id := Empty; | |
2441 | Spec_Id : Entity_Id; | |
21d27997 RD |
2442 | |
2443 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
2444 | -- When we analyze a separate spec, the entity chain ends up containing | |
2445 | -- the formals, as well as any itypes generated during analysis of the | |
2446 | -- default expressions for parameters, or the arguments of associated | |
2447 | -- precondition/postcondition pragmas (which are analyzed in the context | |
2448 | -- of the spec since they have visibility on formals). | |
2449 | -- | |
2450 | -- These entities belong with the spec and not the body. However we do | |
2451 | -- the analysis of the body in the context of the spec (again to obtain | |
2452 | -- visibility to the formals), and all the entities generated during | |
2453 | -- this analysis end up also chained to the entity chain of the spec. | |
2454 | -- But they really belong to the body, and there is circuitry to move | |
2455 | -- them from the spec to the body. | |
2456 | -- | |
2457 | -- However, when we do this move, we don't want to move the real spec | |
2458 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
2459 | -- variable points to the last real spec entity, so we only move those | |
2460 | -- chained beyond that point. It is initialized to Empty to deal with | |
2461 | -- the case where there is no separate spec. | |
996ae0b0 | 2462 | |
ac072cb2 AC |
2463 | function Body_Has_Contract return Boolean; |
2464 | -- Check whether unanalyzed body has an aspect or pragma that may | |
1399d355 | 2465 | -- generate a SPARK contract. |
ac072cb2 | 2466 | |
fd22e260 AC |
2467 | function Body_Has_SPARK_Mode_On return Boolean; |
2468 | -- Check whether SPARK_Mode On applies to the subprogram body, either | |
2469 | -- because it is specified directly on the body, or because it is | |
2470 | -- inherited from the enclosing subprogram or package. | |
2471 | ||
8d1fe980 AC |
2472 | procedure Build_Subprogram_Declaration; |
2473 | -- Create a matching subprogram declaration for subprogram body N | |
2474 | ||
ec4867fa | 2475 | procedure Check_Anonymous_Return; |
e50e1c5e | 2476 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
2477 | -- or a type that contains tasks, we must create a master entity for |
2478 | -- the anonymous type, which typically will be used in an allocator | |
2479 | -- in the body of the function. | |
2480 | ||
e660dbf7 JM |
2481 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
2482 | -- Look ahead to recognize a pragma that may appear after the body. | |
2483 | -- If there is a previous spec, check that it appears in the same | |
2484 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
2485 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
2486 | -- If the body acts as a spec, and inlining is required, we create a | |
2487 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
2488 | -- If pragma does not appear after the body, check whether there is |
2489 | -- an inline pragma before any local declarations. | |
c37bb106 | 2490 | |
7665e4bd AC |
2491 | procedure Check_Missing_Return; |
2492 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
2493 | -- the warning checks implemented by Check_Returns. In formal mode, also |
2494 | -- verify that a function ends with a RETURN and that a procedure does | |
2495 | -- not contain any RETURN. | |
7665e4bd | 2496 | |
d44202ba HK |
2497 | function Disambiguate_Spec return Entity_Id; |
2498 | -- When a primitive is declared between the private view and the full | |
2499 | -- view of a concurrent type which implements an interface, a special | |
2500 | -- mechanism is used to find the corresponding spec of the primitive | |
2501 | -- body. | |
2502 | ||
1e55d29a | 2503 | function Exchange_Limited_Views (Subp_Id : Entity_Id) return Elist_Id; |
5dcab3ca | 2504 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains |
1e55d29a EB |
2505 | -- incomplete types coming from a limited context and replace their |
2506 | -- limited views with the non-limited ones. Return the list of changes | |
2507 | -- to be used to undo the transformation. | |
5dcab3ca | 2508 | |
d44202ba HK |
2509 | function Is_Private_Concurrent_Primitive |
2510 | (Subp_Id : Entity_Id) return Boolean; | |
2511 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
2512 | -- type that implements an interface and has a private view. | |
2513 | ||
a83d0680 AC |
2514 | function Mask_Unfrozen_Types (Spec_Id : Entity_Id) return Elist_Id; |
2515 | -- N is the body generated for an expression function that is not a | |
2516 | -- completion and Spec_Id the defining entity of its spec. Mark all | |
2517 | -- the not-yet-frozen types referenced by the simple return statement | |
2518 | -- of the function as formally frozen. | |
2519 | ||
1e55d29a EB |
2520 | procedure Restore_Limited_Views (Restore_List : Elist_Id); |
2521 | -- Undo the transformation done by Exchange_Limited_Views. | |
2522 | ||
76a69663 ES |
2523 | procedure Set_Trivial_Subprogram (N : Node_Id); |
2524 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
2525 | -- subprogram whose body is being analyzed. N is the statement node | |
2526 | -- causing the flag to be set, if the following statement is a return | |
2527 | -- of an entity, we mark the entity as set in source to suppress any | |
2528 | -- warning on the stylized use of function stubs with a dummy return. | |
2529 | ||
a83d0680 AC |
2530 | procedure Unmask_Unfrozen_Types (Unmask_List : Elist_Id); |
2531 | -- Undo the transformation done by Mask_Unfrozen_Types | |
2532 | ||
758c442c GD |
2533 | procedure Verify_Overriding_Indicator; |
2534 | -- If there was a previous spec, the entity has been entered in the | |
2535 | -- current scope previously. If the body itself carries an overriding | |
2536 | -- indicator, check that it is consistent with the known status of the | |
2537 | -- entity. | |
2538 | ||
ac072cb2 AC |
2539 | ----------------------- |
2540 | -- Body_Has_Contract -- | |
2541 | ----------------------- | |
2542 | ||
2543 | function Body_Has_Contract return Boolean is | |
8d1fe980 AC |
2544 | Decls : constant List_Id := Declarations (N); |
2545 | Item : Node_Id; | |
ac072cb2 AC |
2546 | |
2547 | begin | |
33398e3c | 2548 | -- Check for aspects that may generate a contract |
ac072cb2 AC |
2549 | |
2550 | if Present (Aspect_Specifications (N)) then | |
8d1fe980 AC |
2551 | Item := First (Aspect_Specifications (N)); |
2552 | while Present (Item) loop | |
33398e3c | 2553 | if Is_Subprogram_Contract_Annotation (Item) then |
ac072cb2 AC |
2554 | return True; |
2555 | end if; | |
2556 | ||
8d1fe980 | 2557 | Next (Item); |
ac072cb2 AC |
2558 | end loop; |
2559 | end if; | |
2560 | ||
1399d355 | 2561 | -- Check for pragmas that may generate a contract |
ac072cb2 AC |
2562 | |
2563 | if Present (Decls) then | |
8d1fe980 AC |
2564 | Item := First (Decls); |
2565 | while Present (Item) loop | |
2566 | if Nkind (Item) = N_Pragma | |
33398e3c | 2567 | and then Is_Subprogram_Contract_Annotation (Item) |
8d1fe980 AC |
2568 | then |
2569 | return True; | |
ac072cb2 AC |
2570 | end if; |
2571 | ||
8d1fe980 | 2572 | Next (Item); |
ac072cb2 AC |
2573 | end loop; |
2574 | end if; | |
2575 | ||
2576 | return False; | |
2577 | end Body_Has_Contract; | |
2578 | ||
fd22e260 AC |
2579 | ---------------------------- |
2580 | -- Body_Has_SPARK_Mode_On -- | |
2581 | ---------------------------- | |
2582 | ||
2583 | function Body_Has_SPARK_Mode_On return Boolean is | |
2584 | Decls : constant List_Id := Declarations (N); | |
2585 | Item : Node_Id; | |
2586 | ||
2587 | begin | |
2588 | -- Check for SPARK_Mode aspect | |
2589 | ||
2590 | if Present (Aspect_Specifications (N)) then | |
2591 | Item := First (Aspect_Specifications (N)); | |
2592 | while Present (Item) loop | |
2593 | if Get_Aspect_Id (Item) = Aspect_SPARK_Mode then | |
933aa0ac | 2594 | return Get_SPARK_Mode_From_Annotation (Item) = On; |
fd22e260 AC |
2595 | end if; |
2596 | ||
2597 | Next (Item); | |
2598 | end loop; | |
2599 | end if; | |
2600 | ||
2601 | -- Check for SPARK_Mode pragma | |
2602 | ||
2603 | if Present (Decls) then | |
2604 | Item := First (Decls); | |
2605 | while Present (Item) loop | |
933aa0ac AC |
2606 | |
2607 | -- Pragmas that apply to a subprogram body are usually grouped | |
2608 | -- together. Look for a potential pragma SPARK_Mode among them. | |
2609 | ||
2610 | if Nkind (Item) = N_Pragma then | |
2611 | if Get_Pragma_Id (Item) = Pragma_SPARK_Mode then | |
2612 | return Get_SPARK_Mode_From_Annotation (Item) = On; | |
2613 | end if; | |
2614 | ||
2615 | -- Otherwise the first non-pragma declarative item terminates | |
2616 | -- the region where pragma SPARK_Mode may appear. | |
2617 | ||
2618 | else | |
2619 | exit; | |
fd22e260 AC |
2620 | end if; |
2621 | ||
2622 | Next (Item); | |
2623 | end loop; | |
2624 | end if; | |
2625 | ||
933aa0ac AC |
2626 | -- Otherwise, the applicable SPARK_Mode is inherited from the |
2627 | -- enclosing subprogram or package. | |
fd22e260 AC |
2628 | |
2629 | return SPARK_Mode = On; | |
2630 | end Body_Has_SPARK_Mode_On; | |
2631 | ||
8d1fe980 AC |
2632 | ---------------------------------- |
2633 | -- Build_Subprogram_Declaration -- | |
2634 | ---------------------------------- | |
2635 | ||
2636 | procedure Build_Subprogram_Declaration is | |
3f8c04e7 AC |
2637 | procedure Move_Pragmas (From : Node_Id; To : Node_Id); |
2638 | -- Relocate certain categorization pragmas from the declarative list | |
2639 | -- of subprogram body From and insert them after node To. The pragmas | |
2640 | -- in question are: | |
2641 | -- Ghost | |
3f8c04e7 | 2642 | -- Volatile_Function |
0a3ec628 AC |
2643 | -- Also copy pragma SPARK_Mode if present in the declarative list |
2644 | -- of subprogram body From and insert it after node To. This pragma | |
2645 | -- should not be moved, as it applies to the body too. | |
3f8c04e7 AC |
2646 | |
2647 | ------------------ | |
2648 | -- Move_Pragmas -- | |
2649 | ------------------ | |
2650 | ||
2651 | procedure Move_Pragmas (From : Node_Id; To : Node_Id) is | |
2652 | Decl : Node_Id; | |
2653 | Next_Decl : Node_Id; | |
2654 | ||
2655 | begin | |
2656 | pragma Assert (Nkind (From) = N_Subprogram_Body); | |
2657 | ||
7f54dc83 | 2658 | -- The destination node must be part of a list, as the pragmas are |
3f8c04e7 AC |
2659 | -- inserted after it. |
2660 | ||
2661 | pragma Assert (Is_List_Member (To)); | |
2662 | ||
2663 | -- Inspect the declarations of the subprogram body looking for | |
2664 | -- specific pragmas. | |
2665 | ||
2666 | Decl := First (Declarations (N)); | |
2667 | while Present (Decl) loop | |
2668 | Next_Decl := Next (Decl); | |
2669 | ||
0a3ec628 AC |
2670 | if Nkind (Decl) = N_Pragma then |
2671 | if Pragma_Name_Unmapped (Decl) = Name_SPARK_Mode then | |
2672 | Insert_After (To, New_Copy_Tree (Decl)); | |
2673 | ||
2674 | elsif Nam_In (Pragma_Name_Unmapped (Decl), | |
2675 | Name_Ghost, | |
2676 | Name_Volatile_Function) | |
2677 | then | |
2678 | Remove (Decl); | |
2679 | Insert_After (To, Decl); | |
2680 | end if; | |
3f8c04e7 AC |
2681 | end if; |
2682 | ||
2683 | Decl := Next_Decl; | |
2684 | end loop; | |
2685 | end Move_Pragmas; | |
2686 | ||
2687 | -- Local variables | |
2688 | ||
8d1fe980 AC |
2689 | Decl : Node_Id; |
2690 | Subp_Decl : Node_Id; | |
2691 | ||
3f8c04e7 AC |
2692 | -- Start of processing for Build_Subprogram_Declaration |
2693 | ||
8d1fe980 AC |
2694 | begin |
2695 | -- Create a matching subprogram spec using the profile of the body. | |
2696 | -- The structure of the tree is identical, but has new entities for | |
2697 | -- the defining unit name and formal parameters. | |
2698 | ||
2699 | Subp_Decl := | |
2700 | Make_Subprogram_Declaration (Loc, | |
2701 | Specification => Copy_Subprogram_Spec (Body_Spec)); | |
877a5a12 | 2702 | Set_Comes_From_Source (Subp_Decl, True); |
8d1fe980 | 2703 | |
90265b93 YM |
2704 | -- Also mark parameters as coming from source |
2705 | ||
2706 | if Present (Parameter_Specifications (Specification (Subp_Decl))) then | |
2707 | declare | |
2708 | Form : Entity_Id; | |
2709 | begin | |
2710 | Form := | |
2711 | First (Parameter_Specifications (Specification (Subp_Decl))); | |
2712 | ||
2713 | while Present (Form) loop | |
2714 | Set_Comes_From_Source (Defining_Identifier (Form), True); | |
2715 | Next (Form); | |
2716 | end loop; | |
2717 | end; | |
2718 | end if; | |
2719 | ||
3f8c04e7 AC |
2720 | -- Relocate the aspects and relevant pragmas from the subprogram body |
2721 | -- to the generated spec because it acts as the initial declaration. | |
8d1fe980 | 2722 | |
3f8c04e7 | 2723 | Insert_Before (N, Subp_Decl); |
8d1fe980 | 2724 | Move_Aspects (N, To => Subp_Decl); |
3f8c04e7 | 2725 | Move_Pragmas (N, To => Subp_Decl); |
8d1fe980 | 2726 | |
0a3ec628 AC |
2727 | -- Ensure that the generated corresponding spec and original body |
2728 | -- share the same SPARK_Mode pragma or aspect. As a result, both have | |
2729 | -- the same SPARK_Mode attributes, and the global SPARK_Mode value is | |
2730 | -- correctly set for local subprograms. | |
2731 | ||
2732 | Copy_SPARK_Mode_Aspect (Subp_Decl, To => N); | |
2733 | ||
3f8c04e7 AC |
2734 | Analyze (Subp_Decl); |
2735 | ||
888be6b1 AC |
2736 | -- Propagate the attributes Rewritten_For_C and Corresponding_Proc to |
2737 | -- the body since the expander may generate calls using that entity. | |
2738 | -- Required to ensure that Expand_Call rewrites calls to this | |
2739 | -- function by calls to the built procedure. | |
2740 | ||
2741 | if Modify_Tree_For_C | |
2742 | and then Nkind (Body_Spec) = N_Function_Specification | |
2743 | and then | |
2744 | Rewritten_For_C (Defining_Entity (Specification (Subp_Decl))) | |
2745 | then | |
2746 | Set_Rewritten_For_C (Defining_Entity (Body_Spec)); | |
2747 | Set_Corresponding_Procedure (Defining_Entity (Body_Spec), | |
2748 | Corresponding_Procedure | |
2749 | (Defining_Entity (Specification (Subp_Decl)))); | |
aeb98f1d JM |
2750 | end if; |
2751 | ||
3f8c04e7 AC |
2752 | -- Analyze any relocated source pragmas or pragmas created for aspect |
2753 | -- specifications. | |
8d1fe980 AC |
2754 | |
2755 | Decl := Next (Subp_Decl); | |
2756 | while Present (Decl) loop | |
2757 | ||
2758 | -- Stop the search for pragmas once the body has been reached as | |
2759 | -- this terminates the region where pragmas may appear. | |
2760 | ||
2761 | if Decl = N then | |
2762 | exit; | |
2763 | ||
2764 | elsif Nkind (Decl) = N_Pragma then | |
2765 | Analyze (Decl); | |
2766 | end if; | |
2767 | ||
2768 | Next (Decl); | |
2769 | end loop; | |
2770 | ||
2771 | Spec_Id := Defining_Entity (Subp_Decl); | |
2772 | Set_Corresponding_Spec (N, Spec_Id); | |
2773 | ||
2774 | -- Mark the generated spec as a source construct to ensure that all | |
2775 | -- calls to it are properly registered in ALI files for GNATprove. | |
2776 | ||
2777 | Set_Comes_From_Source (Spec_Id, True); | |
2778 | ||
8d1fe980 AC |
2779 | -- Ensure that the specs of the subprogram declaration and its body |
2780 | -- are identical, otherwise they will appear non-conformant due to | |
2781 | -- rewritings in the default values of formal parameters. | |
2782 | ||
2783 | Body_Spec := Copy_Subprogram_Spec (Body_Spec); | |
2784 | Set_Specification (N, Body_Spec); | |
2785 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); | |
2786 | end Build_Subprogram_Declaration; | |
2787 | ||
ec4867fa ES |
2788 | ---------------------------- |
2789 | -- Check_Anonymous_Return -- | |
2790 | ---------------------------- | |
2791 | ||
2792 | procedure Check_Anonymous_Return is | |
2793 | Decl : Node_Id; | |
a523b302 | 2794 | Par : Node_Id; |
ec4867fa ES |
2795 | Scop : Entity_Id; |
2796 | ||
2797 | begin | |
2798 | if Present (Spec_Id) then | |
2799 | Scop := Spec_Id; | |
2800 | else | |
2801 | Scop := Body_Id; | |
2802 | end if; | |
2803 | ||
2804 | if Ekind (Scop) = E_Function | |
2805 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 | 2806 | and then not Is_Thunk (Scop) |
4b963531 AC |
2807 | |
2808 | -- Skip internally built functions which handle the case of | |
2809 | -- a null access (see Expand_Interface_Conversion) | |
2810 | ||
2811 | and then not (Is_Interface (Designated_Type (Etype (Scop))) | |
4b6f99f5 | 2812 | and then not Comes_From_Source (Parent (Scop))) |
4b963531 | 2813 | |
a523b302 JM |
2814 | and then (Has_Task (Designated_Type (Etype (Scop))) |
2815 | or else | |
4b6f99f5 RD |
2816 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) |
2817 | and then | |
2818 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 2819 | and then Expander_Active |
b20de9b9 | 2820 | |
8fde064e | 2821 | -- Avoid cases with no tasking support |
b20de9b9 AC |
2822 | |
2823 | and then RTE_Available (RE_Current_Master) | |
2824 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
2825 | then |
2826 | Decl := | |
2827 | Make_Object_Declaration (Loc, | |
2828 | Defining_Identifier => | |
2829 | Make_Defining_Identifier (Loc, Name_uMaster), | |
2830 | Constant_Present => True, | |
2831 | Object_Definition => | |
e4494292 | 2832 | New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
ec4867fa ES |
2833 | Expression => |
2834 | Make_Explicit_Dereference (Loc, | |
e4494292 | 2835 | New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
ec4867fa ES |
2836 | |
2837 | if Present (Declarations (N)) then | |
2838 | Prepend (Decl, Declarations (N)); | |
2839 | else | |
2840 | Set_Declarations (N, New_List (Decl)); | |
2841 | end if; | |
2842 | ||
2843 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
2844 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
2845 | |
2846 | -- Now mark the containing scope as a task master | |
2847 | ||
2848 | Par := N; | |
2849 | while Nkind (Par) /= N_Compilation_Unit loop | |
2850 | Par := Parent (Par); | |
2851 | pragma Assert (Present (Par)); | |
2852 | ||
2853 | -- If we fall off the top, we are at the outer level, and | |
2854 | -- the environment task is our effective master, so nothing | |
2855 | -- to mark. | |
2856 | ||
2857 | if Nkind_In | |
2858 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
2859 | then | |
2860 | Set_Is_Task_Master (Par, True); | |
2861 | exit; | |
2862 | end if; | |
2863 | end loop; | |
ec4867fa ES |
2864 | end if; |
2865 | end Check_Anonymous_Return; | |
2866 | ||
e660dbf7 JM |
2867 | ------------------------- |
2868 | -- Check_Inline_Pragma -- | |
2869 | ------------------------- | |
758c442c | 2870 | |
e660dbf7 JM |
2871 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
2872 | Prag : Node_Id; | |
2873 | Plist : List_Id; | |
0fb2ea01 | 2874 | |
21d27997 | 2875 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 2876 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 2877 | -- to this subprogram. |
21d27997 RD |
2878 | |
2879 | ----------------------- | |
2880 | -- Is_Inline_Pragma -- | |
2881 | ----------------------- | |
2882 | ||
2883 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
2884 | begin | |
b269f477 | 2885 | if Nkind (N) = N_Pragma |
21d27997 | 2886 | and then |
6e759c2a BD |
2887 | (Pragma_Name_Unmapped (N) = Name_Inline_Always |
2888 | or else (Pragma_Name_Unmapped (N) = Name_Inline | |
87feba05 AC |
2889 | and then |
2890 | (Front_End_Inlining or else Optimization_Level > 0))) | |
274c2cda | 2891 | and then Present (Pragma_Argument_Associations (N)) |
b269f477 BD |
2892 | then |
2893 | declare | |
2894 | Pragma_Arg : Node_Id := | |
2895 | Expression (First (Pragma_Argument_Associations (N))); | |
2896 | begin | |
2897 | if Nkind (Pragma_Arg) = N_Selected_Component then | |
2898 | Pragma_Arg := Selector_Name (Pragma_Arg); | |
2899 | end if; | |
2900 | ||
2901 | return Chars (Pragma_Arg) = Chars (Body_Id); | |
2902 | end; | |
2903 | ||
2904 | else | |
2905 | return False; | |
2906 | end if; | |
21d27997 RD |
2907 | end Is_Inline_Pragma; |
2908 | ||
2909 | -- Start of processing for Check_Inline_Pragma | |
2910 | ||
c37bb106 | 2911 | begin |
e660dbf7 JM |
2912 | if not Expander_Active then |
2913 | return; | |
2914 | end if; | |
2915 | ||
2916 | if Is_List_Member (N) | |
2917 | and then Present (Next (N)) | |
21d27997 | 2918 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2919 | then |
2920 | Prag := Next (N); | |
2921 | ||
21d27997 RD |
2922 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2923 | and then Present (Declarations (N)) | |
2924 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2925 | then | |
2926 | Prag := First (Declarations (N)); | |
2927 | ||
e660dbf7 JM |
2928 | else |
2929 | Prag := Empty; | |
c37bb106 | 2930 | end if; |
e660dbf7 JM |
2931 | |
2932 | if Present (Prag) then | |
2933 | if Present (Spec_Id) then | |
b269f477 BD |
2934 | if Is_List_Member (N) |
2935 | and then Is_List_Member (Unit_Declaration_Node (Spec_Id)) | |
2936 | and then In_Same_List (N, Unit_Declaration_Node (Spec_Id)) | |
2937 | then | |
e660dbf7 JM |
2938 | Analyze (Prag); |
2939 | end if; | |
2940 | ||
2941 | else | |
274c2cda AC |
2942 | -- Create a subprogram declaration, to make treatment uniform. |
2943 | -- Make the sloc of the subprogram name that of the entity in | |
2944 | -- the body, so that style checks find identical strings. | |
e660dbf7 JM |
2945 | |
2946 | declare | |
2947 | Subp : constant Entity_Id := | |
274c2cda AC |
2948 | Make_Defining_Identifier |
2949 | (Sloc (Body_Id), Chars (Body_Id)); | |
e660dbf7 | 2950 | Decl : constant Node_Id := |
30196a76 RD |
2951 | Make_Subprogram_Declaration (Loc, |
2952 | Specification => | |
2953 | New_Copy_Tree (Specification (N))); | |
2954 | ||
e660dbf7 | 2955 | begin |
2eda24e9 PMR |
2956 | -- Link the body and the generated spec |
2957 | ||
2958 | Set_Corresponding_Body (Decl, Body_Id); | |
2959 | Set_Corresponding_Spec (N, Subp); | |
2960 | ||
e660dbf7 JM |
2961 | Set_Defining_Unit_Name (Specification (Decl), Subp); |
2962 | ||
4afcf3a5 AC |
2963 | -- To ensure proper coverage when body is inlined, indicate |
2964 | -- whether the subprogram comes from source. | |
2965 | ||
2966 | Set_Comes_From_Source (Subp, Comes_From_Source (N)); | |
2967 | ||
e660dbf7 | 2968 | if Present (First_Formal (Body_Id)) then |
21d27997 | 2969 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2970 | Set_Parameter_Specifications |
2971 | (Specification (Decl), Plist); | |
2972 | end if; | |
2973 | ||
a5fa1522 JM |
2974 | -- Move aspects to the new spec |
2975 | ||
2976 | if Has_Aspects (N) then | |
2977 | Move_Aspects (N, To => Decl); | |
2978 | end if; | |
2979 | ||
e660dbf7 JM |
2980 | Insert_Before (N, Decl); |
2981 | Analyze (Decl); | |
2982 | Analyze (Prag); | |
2983 | Set_Has_Pragma_Inline (Subp); | |
2984 | ||
6e759c2a | 2985 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2986 | Set_Is_Inlined (Subp); |
21d27997 | 2987 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2988 | end if; |
2989 | ||
158d55fa AC |
2990 | -- Prior to copying the subprogram body to create a template |
2991 | -- for it for subsequent inlining, remove the pragma from | |
2992 | -- the current body so that the copy that will produce the | |
2993 | -- new body will start from a completely unanalyzed tree. | |
2994 | ||
2995 | if Nkind (Parent (Prag)) = N_Subprogram_Body then | |
2996 | Rewrite (Prag, Make_Null_Statement (Sloc (Prag))); | |
2997 | end if; | |
2998 | ||
e660dbf7 JM |
2999 | Spec := Subp; |
3000 | end; | |
3001 | end if; | |
3002 | end if; | |
3003 | end Check_Inline_Pragma; | |
3004 | ||
7665e4bd AC |
3005 | -------------------------- |
3006 | -- Check_Missing_Return -- | |
3007 | -------------------------- | |
3008 | ||
3009 | procedure Check_Missing_Return is | |
3010 | Id : Entity_Id; | |
3011 | Missing_Ret : Boolean; | |
3012 | ||
3013 | begin | |
3014 | if Nkind (Body_Spec) = N_Function_Specification then | |
3015 | if Present (Spec_Id) then | |
3016 | Id := Spec_Id; | |
3017 | else | |
3018 | Id := Body_Id; | |
3019 | end if; | |
3020 | ||
fe5d3068 | 3021 | if Return_Present (Id) then |
7665e4bd AC |
3022 | Check_Returns (HSS, 'F', Missing_Ret); |
3023 | ||
3024 | if Missing_Ret then | |
3025 | Set_Has_Missing_Return (Id); | |
3026 | end if; | |
3027 | ||
241fac51 ES |
3028 | -- Within a premature instantiation of a package with no body, we |
3029 | -- build completions of the functions therein, with a Raise | |
3030 | -- statement. No point in complaining about a missing return in | |
3031 | -- this case. | |
3032 | ||
3033 | elsif Ekind (Id) = E_Function | |
3034 | and then In_Instance | |
3035 | and then Present (Statements (HSS)) | |
3036 | and then Nkind (First (Statements (HSS))) = N_Raise_Program_Error | |
3037 | then | |
3038 | null; | |
3039 | ||
2aca76d6 AC |
3040 | elsif Is_Generic_Subprogram (Id) |
3041 | or else not Is_Machine_Code_Subprogram (Id) | |
7665e4bd AC |
3042 | then |
3043 | Error_Msg_N ("missing RETURN statement in function body", N); | |
3044 | end if; | |
3045 | ||
fe5d3068 | 3046 | -- If procedure with No_Return, check returns |
607d0635 | 3047 | |
0562ed31 PT |
3048 | elsif Nkind (Body_Spec) = N_Procedure_Specification then |
3049 | if Present (Spec_Id) then | |
3050 | Id := Spec_Id; | |
3051 | else | |
3052 | Id := Body_Id; | |
3053 | end if; | |
3054 | ||
3055 | if No_Return (Id) then | |
3056 | Check_Returns (HSS, 'P', Missing_Ret, Id); | |
3057 | end if; | |
fe5d3068 YM |
3058 | end if; |
3059 | ||
ad05f2e9 | 3060 | -- Special checks in SPARK mode |
fe5d3068 YM |
3061 | |
3062 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 3063 | |
ad05f2e9 | 3064 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
3065 | |
3066 | declare | |
3067 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
3068 | begin | |
3069 | if Present (Stat) | |
7394c8cc AC |
3070 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
3071 | N_Extended_Return_Statement) | |
fe5d3068 | 3072 | then |
ce5ba43a | 3073 | Check_SPARK_05_Restriction |
fe5d3068 YM |
3074 | ("last statement in function should be RETURN", Stat); |
3075 | end if; | |
3076 | end; | |
3077 | ||
ad05f2e9 | 3078 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
3079 | |
3080 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
3081 | if Present (Spec_Id) then |
3082 | Id := Spec_Id; | |
3083 | else | |
3084 | Id := Body_Id; | |
3085 | end if; | |
3086 | ||
8d606a78 RD |
3087 | -- Would be nice to point to return statement here, can we |
3088 | -- borrow the Check_Returns procedure here ??? | |
3089 | ||
607d0635 | 3090 | if Return_Present (Id) then |
ce5ba43a | 3091 | Check_SPARK_05_Restriction |
fe5d3068 | 3092 | ("procedure should not have RETURN", N); |
607d0635 | 3093 | end if; |
7665e4bd AC |
3094 | end if; |
3095 | end Check_Missing_Return; | |
3096 | ||
d44202ba HK |
3097 | ----------------------- |
3098 | -- Disambiguate_Spec -- | |
3099 | ----------------------- | |
3100 | ||
3101 | function Disambiguate_Spec return Entity_Id is | |
3102 | Priv_Spec : Entity_Id; | |
3103 | Spec_N : Entity_Id; | |
3104 | ||
3105 | procedure Replace_Types (To_Corresponding : Boolean); | |
3106 | -- Depending on the flag, replace the type of formal parameters of | |
3107 | -- Body_Id if it is a concurrent type implementing interfaces with | |
3108 | -- the corresponding record type or the other way around. | |
3109 | ||
3110 | procedure Replace_Types (To_Corresponding : Boolean) is | |
3111 | Formal : Entity_Id; | |
3112 | Formal_Typ : Entity_Id; | |
3113 | ||
3114 | begin | |
3115 | Formal := First_Formal (Body_Id); | |
3116 | while Present (Formal) loop | |
3117 | Formal_Typ := Etype (Formal); | |
3118 | ||
df3e68b1 HK |
3119 | if Is_Class_Wide_Type (Formal_Typ) then |
3120 | Formal_Typ := Root_Type (Formal_Typ); | |
3121 | end if; | |
3122 | ||
d44202ba HK |
3123 | -- From concurrent type to corresponding record |
3124 | ||
3125 | if To_Corresponding then | |
3126 | if Is_Concurrent_Type (Formal_Typ) | |
3127 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4b6f99f5 RD |
3128 | and then |
3129 | Present (Interfaces | |
3130 | (Corresponding_Record_Type (Formal_Typ))) | |
d44202ba HK |
3131 | then |
3132 | Set_Etype (Formal, | |
3133 | Corresponding_Record_Type (Formal_Typ)); | |
3134 | end if; | |
3135 | ||
3136 | -- From corresponding record to concurrent type | |
3137 | ||
3138 | else | |
3139 | if Is_Concurrent_Record_Type (Formal_Typ) | |
3140 | and then Present (Interfaces (Formal_Typ)) | |
3141 | then | |
3142 | Set_Etype (Formal, | |
3143 | Corresponding_Concurrent_Type (Formal_Typ)); | |
3144 | end if; | |
3145 | end if; | |
3146 | ||
3147 | Next_Formal (Formal); | |
3148 | end loop; | |
3149 | end Replace_Types; | |
3150 | ||
3151 | -- Start of processing for Disambiguate_Spec | |
3152 | ||
3153 | begin | |
3154 | -- Try to retrieve the specification of the body as is. All error | |
3155 | -- messages are suppressed because the body may not have a spec in | |
3156 | -- its current state. | |
3157 | ||
3158 | Spec_N := Find_Corresponding_Spec (N, False); | |
3159 | ||
3160 | -- It is possible that this is the body of a primitive declared | |
3161 | -- between a private and a full view of a concurrent type. The | |
3162 | -- controlling parameter of the spec carries the concurrent type, | |
3163 | -- not the corresponding record type as transformed by Analyze_ | |
3164 | -- Subprogram_Specification. In such cases, we undo the change | |
3165 | -- made by the analysis of the specification and try to find the | |
3166 | -- spec again. | |
766d7add | 3167 | |
8198b93d HK |
3168 | -- Note that wrappers already have their corresponding specs and |
3169 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 3170 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 3171 | -- original concurrent status. |
d44202ba | 3172 | |
8198b93d HK |
3173 | if No (Spec_N) |
3174 | or else Is_Primitive_Wrapper (Spec_N) | |
3175 | then | |
d44202ba HK |
3176 | -- Restore all references of corresponding record types to the |
3177 | -- original concurrent types. | |
3178 | ||
3179 | Replace_Types (To_Corresponding => False); | |
3180 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
3181 | ||
3182 | -- The current body truly belongs to a primitive declared between | |
3183 | -- a private and a full view. We leave the modified body as is, | |
3184 | -- and return the true spec. | |
3185 | ||
3186 | if Present (Priv_Spec) | |
3187 | and then Is_Private_Primitive (Priv_Spec) | |
3188 | then | |
3189 | return Priv_Spec; | |
3190 | end if; | |
3191 | ||
3192 | -- In case that this is some sort of error, restore the original | |
3193 | -- state of the body. | |
3194 | ||
3195 | Replace_Types (To_Corresponding => True); | |
3196 | end if; | |
3197 | ||
3198 | return Spec_N; | |
3199 | end Disambiguate_Spec; | |
3200 | ||
5dcab3ca AC |
3201 | ---------------------------- |
3202 | -- Exchange_Limited_Views -- | |
3203 | ---------------------------- | |
3204 | ||
1e55d29a EB |
3205 | function Exchange_Limited_Views (Subp_Id : Entity_Id) return Elist_Id is |
3206 | Result : Elist_Id := No_Elist; | |
3207 | ||
5dcab3ca AC |
3208 | procedure Detect_And_Exchange (Id : Entity_Id); |
3209 | -- Determine whether Id's type denotes an incomplete type associated | |
3210 | -- with a limited with clause and exchange the limited view with the | |
72d5c70b AC |
3211 | -- non-limited one when available. Note that the non-limited view |
3212 | -- may exist because of a with_clause in another unit in the context, | |
3213 | -- but cannot be used because the current view of the enclosing unit | |
3214 | -- is still a limited view. | |
5dcab3ca AC |
3215 | |
3216 | ------------------------- | |
3217 | -- Detect_And_Exchange -- | |
3218 | ------------------------- | |
3219 | ||
3220 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
3221 | Typ : constant Entity_Id := Etype (Id); | |
5dcab3ca | 3222 | begin |
72d5c70b AC |
3223 | if From_Limited_With (Typ) |
3224 | and then Has_Non_Limited_View (Typ) | |
3225 | and then not From_Limited_With (Scope (Typ)) | |
3226 | then | |
1e55d29a EB |
3227 | if No (Result) then |
3228 | Result := New_Elmt_List; | |
3229 | end if; | |
3230 | ||
3231 | Prepend_Elmt (Typ, Result); | |
3232 | Prepend_Elmt (Id, Result); | |
5dcab3ca AC |
3233 | Set_Etype (Id, Non_Limited_View (Typ)); |
3234 | end if; | |
3235 | end Detect_And_Exchange; | |
3236 | ||
3237 | -- Local variables | |
3238 | ||
3239 | Formal : Entity_Id; | |
3240 | ||
3241 | -- Start of processing for Exchange_Limited_Views | |
3242 | ||
3243 | begin | |
5dcab3ca AC |
3244 | -- Do not process subprogram bodies as they already use the non- |
3245 | -- limited view of types. | |
3246 | ||
128a98ea | 3247 | if not Ekind_In (Subp_Id, E_Function, E_Procedure) then |
1e55d29a | 3248 | return No_Elist; |
5dcab3ca AC |
3249 | end if; |
3250 | ||
3251 | -- Examine all formals and swap views when applicable | |
3252 | ||
3253 | Formal := First_Formal (Subp_Id); | |
3254 | while Present (Formal) loop | |
3255 | Detect_And_Exchange (Formal); | |
3256 | ||
3257 | Next_Formal (Formal); | |
3258 | end loop; | |
3259 | ||
3260 | -- Process the return type of a function | |
3261 | ||
3262 | if Ekind (Subp_Id) = E_Function then | |
3263 | Detect_And_Exchange (Subp_Id); | |
3264 | end if; | |
1e55d29a EB |
3265 | |
3266 | return Result; | |
5dcab3ca AC |
3267 | end Exchange_Limited_Views; |
3268 | ||
d44202ba HK |
3269 | ------------------------------------- |
3270 | -- Is_Private_Concurrent_Primitive -- | |
3271 | ------------------------------------- | |
3272 | ||
3273 | function Is_Private_Concurrent_Primitive | |
3274 | (Subp_Id : Entity_Id) return Boolean | |
3275 | is | |
3276 | Formal_Typ : Entity_Id; | |
3277 | ||
3278 | begin | |
3279 | if Present (First_Formal (Subp_Id)) then | |
3280 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
3281 | ||
3282 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
3283 | if Is_Class_Wide_Type (Formal_Typ) then |
3284 | Formal_Typ := Root_Type (Formal_Typ); | |
3285 | end if; | |
3286 | ||
d44202ba HK |
3287 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
3288 | end if; | |
3289 | ||
3290 | -- The type of the first formal is a concurrent tagged type with | |
3291 | -- a private view. | |
3292 | ||
3293 | return | |
3294 | Is_Concurrent_Type (Formal_Typ) | |
3295 | and then Is_Tagged_Type (Formal_Typ) | |
3296 | and then Has_Private_Declaration (Formal_Typ); | |
3297 | end if; | |
3298 | ||
3299 | return False; | |
3300 | end Is_Private_Concurrent_Primitive; | |
3301 | ||
a83d0680 AC |
3302 | ------------------------- |
3303 | -- Mask_Unfrozen_Types -- | |
3304 | ------------------------- | |
3305 | ||
3306 | function Mask_Unfrozen_Types (Spec_Id : Entity_Id) return Elist_Id is | |
3307 | Result : Elist_Id := No_Elist; | |
3308 | ||
3309 | function Mask_Type_Refs (Node : Node_Id) return Traverse_Result; | |
3310 | -- Mask all types referenced in the subtree rooted at Node | |
3311 | ||
3312 | -------------------- | |
3313 | -- Mask_Type_Refs -- | |
3314 | -------------------- | |
3315 | ||
3316 | function Mask_Type_Refs (Node : Node_Id) return Traverse_Result is | |
a83d0680 | 3317 | procedure Mask_Type (Typ : Entity_Id); |
d7cc5f0e | 3318 | -- ??? what does this do? |
a83d0680 AC |
3319 | |
3320 | --------------- | |
3321 | -- Mask_Type -- | |
3322 | --------------- | |
3323 | ||
3324 | procedure Mask_Type (Typ : Entity_Id) is | |
3325 | begin | |
3326 | -- Skip Itypes created by the preanalysis | |
3327 | ||
3328 | if Is_Itype (Typ) | |
3329 | and then Scope_Within_Or_Same (Scope (Typ), Spec_Id) | |
3330 | then | |
3331 | return; | |
3332 | end if; | |
3333 | ||
3334 | if not Is_Frozen (Typ) then | |
084e3bd1 ES |
3335 | if Scope (Typ) /= Current_Scope then |
3336 | Set_Is_Frozen (Typ); | |
3337 | Append_New_Elmt (Typ, Result); | |
3338 | else | |
3339 | Freeze_Before (N, Typ); | |
3340 | end if; | |
a83d0680 AC |
3341 | end if; |
3342 | end Mask_Type; | |
3343 | ||
d7cc5f0e PMR |
3344 | -- Start of processing for Mask_Type_Refs |
3345 | ||
a83d0680 AC |
3346 | begin |
3347 | if Is_Entity_Name (Node) and then Present (Entity (Node)) then | |
3348 | Mask_Type (Etype (Entity (Node))); | |
3349 | ||
3350 | if Ekind_In (Entity (Node), E_Component, E_Discriminant) then | |
3351 | Mask_Type (Scope (Entity (Node))); | |
3352 | end if; | |
3353 | ||
3354 | elsif Nkind_In (Node, N_Aggregate, N_Null, N_Type_Conversion) | |
3355 | and then Present (Etype (Node)) | |
3356 | then | |
3357 | Mask_Type (Etype (Node)); | |
3358 | end if; | |
3359 | ||
3360 | return OK; | |
3361 | end Mask_Type_Refs; | |
3362 | ||
3363 | procedure Mask_References is new Traverse_Proc (Mask_Type_Refs); | |
3364 | ||
d7cc5f0e PMR |
3365 | -- Local variables |
3366 | ||
a83d0680 AC |
3367 | Return_Stmt : constant Node_Id := |
3368 | First (Statements (Handled_Statement_Sequence (N))); | |
d7cc5f0e PMR |
3369 | |
3370 | -- Start of processing for Mask_Unfrozen_Types | |
3371 | ||
a83d0680 AC |
3372 | begin |
3373 | pragma Assert (Nkind (Return_Stmt) = N_Simple_Return_Statement); | |
3374 | ||
3375 | Mask_References (Expression (Return_Stmt)); | |
3376 | ||
3377 | return Result; | |
3378 | end Mask_Unfrozen_Types; | |
3379 | ||
1e55d29a EB |
3380 | --------------------------- |
3381 | -- Restore_Limited_Views -- | |
3382 | --------------------------- | |
3383 | ||
3384 | procedure Restore_Limited_Views (Restore_List : Elist_Id) is | |
3385 | Elmt : Elmt_Id := First_Elmt (Restore_List); | |
3386 | Id : Entity_Id; | |
3387 | ||
3388 | begin | |
3389 | while Present (Elmt) loop | |
3390 | Id := Node (Elmt); | |
3391 | Next_Elmt (Elmt); | |
3392 | Set_Etype (Id, Node (Elmt)); | |
3393 | Next_Elmt (Elmt); | |
3394 | end loop; | |
3395 | end Restore_Limited_Views; | |
3396 | ||
76a69663 ES |
3397 | ---------------------------- |
3398 | -- Set_Trivial_Subprogram -- | |
3399 | ---------------------------- | |
3400 | ||
3401 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
3402 | Nxt : constant Node_Id := Next (N); | |
3403 | ||
3404 | begin | |
3405 | Set_Is_Trivial_Subprogram (Body_Id); | |
3406 | ||
3407 | if Present (Spec_Id) then | |
3408 | Set_Is_Trivial_Subprogram (Spec_Id); | |
3409 | end if; | |
3410 | ||
3411 | if Present (Nxt) | |
3412 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
3413 | and then No (Next (Nxt)) | |
3414 | and then Present (Expression (Nxt)) | |
3415 | and then Is_Entity_Name (Expression (Nxt)) | |
3416 | then | |
3417 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
3418 | end if; | |
3419 | end Set_Trivial_Subprogram; | |
3420 | ||
a83d0680 AC |
3421 | --------------------------- |
3422 | -- Unmask_Unfrozen_Types -- | |
3423 | --------------------------- | |
3424 | ||
3425 | procedure Unmask_Unfrozen_Types (Unmask_List : Elist_Id) is | |
3426 | Elmt : Elmt_Id := First_Elmt (Unmask_List); | |
3427 | ||
3428 | begin | |
3429 | while Present (Elmt) loop | |
3430 | Set_Is_Frozen (Node (Elmt), False); | |
3431 | Next_Elmt (Elmt); | |
3432 | end loop; | |
3433 | end Unmask_Unfrozen_Types; | |
3434 | ||
758c442c GD |
3435 | --------------------------------- |
3436 | -- Verify_Overriding_Indicator -- | |
3437 | --------------------------------- | |
3438 | ||
3439 | procedure Verify_Overriding_Indicator is | |
3440 | begin | |
21d27997 RD |
3441 | if Must_Override (Body_Spec) then |
3442 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
4b6f99f5 | 3443 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 RD |
3444 | then |
3445 | null; | |
3446 | ||
08f4f172 JS |
3447 | -- Overridden controlled primitives may have had their |
3448 | -- Overridden_Operation field cleared according to the setting of | |
3449 | -- the Is_Hidden flag. An issue arises, however, when analyzing | |
3450 | -- an instance that may have manipulated the flag during | |
3451 | -- expansion. As a result, we add an exception for this case. | |
3452 | ||
3453 | elsif not Present (Overridden_Operation (Spec_Id)) | |
3454 | and then not (Nam_In (Chars (Spec_Id), Name_Adjust, | |
3455 | Name_Finalize, | |
3456 | Name_Initialize) | |
3457 | and then In_Instance) | |
3458 | then | |
ed2233dc | 3459 | Error_Msg_NE |
21d27997 | 3460 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
23e28b42 AC |
3461 | |
3462 | -- Overriding indicators aren't allowed for protected subprogram | |
3463 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
3464 | -- this to a warning if -gnatd.E is enabled. | |
3465 | ||
3466 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
3467 | Error_Msg_Warn := Error_To_Warning; | |
3468 | Error_Msg_N | |
b785e0b8 | 3469 | ("<<overriding indicator not allowed for protected " |
23e28b42 | 3470 | & "subprogram body", Body_Spec); |
21d27997 | 3471 | end if; |
758c442c | 3472 | |
5d37ba92 | 3473 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 3474 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 3475 | Error_Msg_NE |
5d37ba92 | 3476 | ("subprogram& overrides inherited operation", |
76a69663 | 3477 | Body_Spec, Spec_Id); |
5d37ba92 | 3478 | |
21d27997 | 3479 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
4b6f99f5 | 3480 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 | 3481 | then |
ed2233dc | 3482 | Error_Msg_NE |
3ccedacc | 3483 | ("subprogram& overrides predefined operator ", |
21d27997 RD |
3484 | Body_Spec, Spec_Id); |
3485 | ||
23e28b42 AC |
3486 | -- Overriding indicators aren't allowed for protected subprogram |
3487 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
3488 | -- this to a warning if -gnatd.E is enabled. | |
3489 | ||
3490 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
3491 | Error_Msg_Warn := Error_To_Warning; | |
5d37ba92 | 3492 | |
23e28b42 | 3493 | Error_Msg_N |
3ccedacc AC |
3494 | ("<<overriding indicator not allowed " |
3495 | & "for protected subprogram body", Body_Spec); | |
23e28b42 AC |
3496 | |
3497 | -- If this is not a primitive operation, then the overriding | |
3498 | -- indicator is altogether illegal. | |
3499 | ||
3500 | elsif not Is_Primitive (Spec_Id) then | |
ed2233dc | 3501 | Error_Msg_N |
3ccedacc AC |
3502 | ("overriding indicator only allowed " |
3503 | & "if subprogram is primitive", Body_Spec); | |
5d37ba92 | 3504 | end if; |
235f4375 | 3505 | |
23e28b42 AC |
3506 | -- If checking the style rule and the operation overrides, then |
3507 | -- issue a warning about a missing overriding_indicator. Protected | |
3508 | -- subprogram bodies are excluded from this style checking, since | |
3509 | -- they aren't primitives (even though their declarations can | |
3510 | -- override) and aren't allowed to have an overriding_indicator. | |
3511 | ||
806f6d37 | 3512 | elsif Style_Check |
038140ed | 3513 | and then Present (Overridden_Operation (Spec_Id)) |
23e28b42 | 3514 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type |
235f4375 AC |
3515 | then |
3516 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3517 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
3518 | |
3519 | elsif Style_Check | |
3520 | and then Can_Override_Operator (Spec_Id) | |
8ab31c0c | 3521 | and then not In_Predefined_Unit (Spec_Id) |
806f6d37 AC |
3522 | then |
3523 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3524 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
3525 | end if; |
3526 | end Verify_Overriding_Indicator; | |
3527 | ||
1af4455a HK |
3528 | -- Local variables |
3529 | ||
43b26411 JS |
3530 | Body_Nod : Node_Id := Empty; |
3531 | Minimum_Acc_Objs : List_Id := No_List; | |
3532 | ||
f9a8f910 | 3533 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
9057bd6a | 3534 | Saved_IGR : constant Node_Id := Ignored_Ghost_Region; |
d71b0a9a | 3535 | Saved_EA : constant Boolean := Expander_Active; |
f9a8f910 HK |
3536 | Saved_ISMP : constant Boolean := |
3537 | Ignore_SPARK_Mode_Pragmas_In_Instance; | |
3538 | -- Save the Ghost and SPARK mode-related data to restore on exit | |
1af4455a | 3539 | |
b1b543d2 | 3540 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 3541 | |
996ae0b0 | 3542 | begin |
65e5747e | 3543 | -- A [generic] subprogram body freezes the contract of the nearest |
e645cb39 | 3544 | -- enclosing package body and all other contracts encountered in the |
4404c282 | 3545 | -- same declarative part up to and excluding the subprogram body: |
879ac954 AC |
3546 | |
3547 | -- package body Nearest_Enclosing_Package | |
3548 | -- with Refined_State => (State => Constit) | |
3549 | -- is | |
3550 | -- Constit : ...; | |
3551 | ||
3552 | -- procedure Freezes_Enclosing_Package_Body | |
3553 | -- with Refined_Depends => (Input => Constit) ... | |
3554 | ||
3555 | -- This ensures that any annotations referenced by the contract of the | |
65e5747e | 3556 | -- [generic] subprogram body are available. This form of freezing is |
879ac954 AC |
3557 | -- decoupled from the usual Freeze_xxx mechanism because it must also |
3558 | -- work in the context of generics where normal freezing is disabled. | |
3559 | ||
65e5747e | 3560 | -- Only bodies coming from source should cause this type of freezing. |
77237288 AC |
3561 | -- Expression functions that act as bodies and complete an initial |
3562 | -- declaration must be included in this category, hence the use of | |
3563 | -- Original_Node. | |
3564 | ||
3565 | if Comes_From_Source (Original_Node (N)) then | |
65e5747e | 3566 | Freeze_Previous_Contracts (N); |
77237288 | 3567 | end if; |
879ac954 | 3568 | |
82c80734 RD |
3569 | -- Generic subprograms are handled separately. They always have a |
3570 | -- generic specification. Determine whether current scope has a | |
3571 | -- previous declaration. | |
996ae0b0 | 3572 | |
82c80734 RD |
3573 | -- If the subprogram body is defined within an instance of the same |
3574 | -- name, the instance appears as a package renaming, and will be hidden | |
3575 | -- within the subprogram. | |
996ae0b0 RK |
3576 | |
3577 | if Present (Prev_Id) | |
3578 | and then not Is_Overloadable (Prev_Id) | |
3579 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
3580 | or else Comes_From_Source (Prev_Id)) | |
3581 | then | |
fbf5a39b | 3582 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 | 3583 | Spec_Id := Prev_Id; |
8636f52f | 3584 | |
a2c54c95 | 3585 | -- A subprogram body is Ghost when it is stand-alone and subject |
1af4455a HK |
3586 | -- to pragma Ghost or when the corresponding spec is Ghost. Set |
3587 | -- the mode now to ensure that any nodes generated during analysis | |
3588 | -- and expansion are properly marked as Ghost. | |
8636f52f | 3589 | |
f9a8f910 | 3590 | Mark_And_Set_Ghost_Body (N, Spec_Id); |
d65a80fd | 3591 | |
7255f3c3 HK |
3592 | -- If the body completes the initial declaration of a compilation |
3593 | -- unit which is subject to pragma Elaboration_Checks, set the | |
3594 | -- model specified by the pragma because it applies to all parts | |
3595 | -- of the unit. | |
3596 | ||
3597 | Install_Elaboration_Model (Spec_Id); | |
3598 | ||
996ae0b0 RK |
3599 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); |
3600 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3601 | ||
3602 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
3603 | |
3604 | if Nkind (N) = N_Subprogram_Body then | |
3605 | HSS := Handled_Statement_Sequence (N); | |
3606 | Check_Missing_Return; | |
3607 | end if; | |
3608 | ||
d65a80fd | 3609 | goto Leave; |
996ae0b0 | 3610 | |
d65a80fd HK |
3611 | -- Otherwise a previous entity conflicts with the subprogram name. |
3612 | -- Attempting to enter name will post error. | |
996ae0b0 | 3613 | |
d65a80fd | 3614 | else |
996ae0b0 | 3615 | Enter_Name (Body_Id); |
cf9a473e | 3616 | goto Leave; |
996ae0b0 RK |
3617 | end if; |
3618 | ||
82c80734 RD |
3619 | -- Non-generic case, find the subprogram declaration, if one was seen, |
3620 | -- or enter new overloaded entity in the current scope. If the | |
3621 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
3622 | -- part of the context of one of its subunits. No need to redo the | |
3623 | -- analysis. | |
996ae0b0 | 3624 | |
8fde064e | 3625 | elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
cf9a473e | 3626 | goto Leave; |
996ae0b0 RK |
3627 | |
3628 | else | |
fbf5a39b | 3629 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
3630 | |
3631 | if Nkind (N) = N_Subprogram_Body_Stub | |
3632 | or else No (Corresponding_Spec (N)) | |
3633 | then | |
d44202ba HK |
3634 | if Is_Private_Concurrent_Primitive (Body_Id) then |
3635 | Spec_Id := Disambiguate_Spec; | |
8636f52f | 3636 | |
a2c54c95 | 3637 | -- A subprogram body is Ghost when it is stand-alone and |
1af4455a HK |
3638 | -- subject to pragma Ghost or when the corresponding spec is |
3639 | -- Ghost. Set the mode now to ensure that any nodes generated | |
3640 | -- during analysis and expansion are properly marked as Ghost. | |
8636f52f | 3641 | |
f9a8f910 | 3642 | Mark_And_Set_Ghost_Body (N, Spec_Id); |
8636f52f | 3643 | |
7255f3c3 HK |
3644 | -- If the body completes a compilation unit which is subject |
3645 | -- to pragma Elaboration_Checks, set the model specified by | |
3646 | -- the pragma because it applies to all parts of the unit. | |
3647 | ||
3648 | Install_Elaboration_Model (Spec_Id); | |
3649 | ||
d44202ba HK |
3650 | else |
3651 | Spec_Id := Find_Corresponding_Spec (N); | |
b6c8e5be | 3652 | |
a2c54c95 | 3653 | -- A subprogram body is Ghost when it is stand-alone and |
1af4455a HK |
3654 | -- subject to pragma Ghost or when the corresponding spec is |
3655 | -- Ghost. Set the mode now to ensure that any nodes generated | |
3656 | -- during analysis and expansion are properly marked as Ghost. | |
8636f52f | 3657 | |
f9a8f910 | 3658 | Mark_And_Set_Ghost_Body (N, Spec_Id); |
8636f52f | 3659 | |
7255f3c3 HK |
3660 | -- If the body completes a compilation unit which is subject |
3661 | -- to pragma Elaboration_Checks, set the model specified by | |
3662 | -- the pragma because it applies to all parts of the unit. | |
3663 | ||
3664 | Install_Elaboration_Model (Spec_Id); | |
3665 | ||
b6c8e5be AC |
3666 | -- In GNATprove mode, if the body has no previous spec, create |
3667 | -- one so that the inlining machinery can operate properly. | |
3668 | -- Transfer aspects, if any, to the new spec, so that they | |
3669 | -- are legal and can be processed ahead of the body. | |
3670 | -- We make two copies of the given spec, one for the new | |
3671 | -- declaration, and one for the body. | |
3672 | ||
5a271a7f | 3673 | if No (Spec_Id) and then GNATprove_Mode |
480156b2 | 3674 | |
812e6118 | 3675 | -- Inlining does not apply during preanalysis of code |
480156b2 | 3676 | |
b6c8e5be | 3677 | and then Full_Analysis |
480156b2 AC |
3678 | |
3679 | -- Inlining only applies to full bodies, not stubs | |
3680 | ||
7b2888e6 | 3681 | and then Nkind (N) /= N_Subprogram_Body_Stub |
480156b2 AC |
3682 | |
3683 | -- Inlining only applies to bodies in the source code, not to | |
3684 | -- those generated by the compiler. In particular, expression | |
3685 | -- functions, whose body is generated by the compiler, are | |
3686 | -- treated specially by GNATprove. | |
3687 | ||
b6c8e5be | 3688 | and then Comes_From_Source (Body_Id) |
480156b2 AC |
3689 | |
3690 | -- This cannot be done for a compilation unit, which is not | |
3691 | -- in a context where we can insert a new spec. | |
3692 | ||
b6c8e5be | 3693 | and then Is_List_Member (N) |
480156b2 AC |
3694 | |
3695 | -- Inlining only applies to subprograms without contracts, | |
3696 | -- as a contract is a sign that GNATprove should perform a | |
3697 | -- modular analysis of the subprogram instead of a contextual | |
3698 | -- analysis at each call site. The same test is performed in | |
3699 | -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated | |
ca90b962 GD |
3700 | -- here in another form (because the contract has not been |
3701 | -- attached to the body) to avoid front-end errors in case | |
3702 | -- pragmas are used instead of aspects, because the | |
480156b2 AC |
3703 | -- corresponding pragmas in the body would not be transferred |
3704 | -- to the spec, leading to legality errors. | |
3705 | ||
ac072cb2 | 3706 | and then not Body_Has_Contract |
8d1fe980 | 3707 | and then not Inside_A_Generic |
b6c8e5be | 3708 | then |
8d1fe980 | 3709 | Build_Subprogram_Declaration; |
2ba4f1fb AC |
3710 | |
3711 | -- If this is a function that returns a constrained array, and | |
3712 | -- we are generating SPARK_For_C, create subprogram declaration | |
3713 | -- to simplify subsequent C generation. | |
3714 | ||
3715 | elsif No (Spec_Id) | |
3716 | and then Modify_Tree_For_C | |
3717 | and then Nkind (Body_Spec) = N_Function_Specification | |
3718 | and then Is_Array_Type (Etype (Body_Id)) | |
3719 | and then Is_Constrained (Etype (Body_Id)) | |
3720 | then | |
3721 | Build_Subprogram_Declaration; | |
b6c8e5be | 3722 | end if; |
d44202ba | 3723 | end if; |
996ae0b0 RK |
3724 | |
3725 | -- If this is a duplicate body, no point in analyzing it | |
3726 | ||
3727 | if Error_Posted (N) then | |
d65a80fd | 3728 | goto Leave; |
996ae0b0 RK |
3729 | end if; |
3730 | ||
82c80734 RD |
3731 | -- A subprogram body should cause freezing of its own declaration, |
3732 | -- but if there was no previous explicit declaration, then the | |
3733 | -- subprogram will get frozen too late (there may be code within | |
3734 | -- the body that depends on the subprogram having been frozen, | |
3735 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 3736 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
3737 | -- Finally, if the return type is an anonymous access to protected |
3738 | -- subprogram, it must be frozen before the body because its | |
3739 | -- expansion has generated an equivalent type that is used when | |
3740 | -- elaborating the body. | |
996ae0b0 | 3741 | |
885c4871 | 3742 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
3743 | -- created for expression functions do not freeze. |
3744 | ||
3745 | if No (Spec_Id) | |
3746 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
3747 | then | |
996ae0b0 RK |
3748 | Freeze_Before (N, Body_Id); |
3749 | ||
3750 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
3751 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
3752 | |
3753 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
3754 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 3755 | end if; |
a38ff9b1 | 3756 | |
996ae0b0 RK |
3757 | else |
3758 | Spec_Id := Corresponding_Spec (N); | |
8636f52f | 3759 | |
a2c54c95 | 3760 | -- A subprogram body is Ghost when it is stand-alone and subject |
1af4455a HK |
3761 | -- to pragma Ghost or when the corresponding spec is Ghost. Set |
3762 | -- the mode now to ensure that any nodes generated during analysis | |
3763 | -- and expansion are properly marked as Ghost. | |
8636f52f | 3764 | |
f9a8f910 | 3765 | Mark_And_Set_Ghost_Body (N, Spec_Id); |
7255f3c3 HK |
3766 | |
3767 | -- If the body completes the initial declaration of a compilation | |
3768 | -- unit which is subject to pragma Elaboration_Checks, set the | |
3769 | -- model specified by the pragma because it applies to all parts | |
3770 | -- of the unit. | |
3771 | ||
3772 | Install_Elaboration_Model (Spec_Id); | |
996ae0b0 RK |
3773 | end if; |
3774 | end if; | |
3775 | ||
d71b0a9a YM |
3776 | -- Deactivate expansion inside the body of ignored Ghost entities, |
3777 | -- as this code will ultimately be ignored. This avoids requiring the | |
3778 | -- presence of run-time units which are not needed. Only do this for | |
3779 | -- user entities, as internally generated entitities might still need | |
3780 | -- to be expanded (e.g. those generated for types). | |
3781 | ||
3782 | if Present (Ignored_Ghost_Region) | |
3783 | and then Comes_From_Source (Body_Id) | |
3784 | then | |
3785 | Expander_Active := False; | |
3786 | end if; | |
3787 | ||
799d0e05 AC |
3788 | -- Previously we scanned the body to look for nested subprograms, and |
3789 | -- rejected an inline directive if nested subprograms were present, | |
3790 | -- because the back-end would generate conflicting symbols for the | |
c8957aae | 3791 | -- nested bodies. This is now unnecessary. |
07fc65c4 | 3792 | |
c8957aae | 3793 | -- Look ahead to recognize a pragma Inline that appears after the body |
84f4072a | 3794 | |
e660dbf7 JM |
3795 | Check_Inline_Pragma (Spec_Id); |
3796 | ||
701b7fbb RD |
3797 | -- Deal with special case of a fully private operation in the body of |
3798 | -- the protected type. We must create a declaration for the subprogram, | |
3799 | -- in order to attach the protected subprogram that will be used in | |
3800 | -- internal calls. We exclude compiler generated bodies from the | |
3801 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 3802 | |
996ae0b0 RK |
3803 | if No (Spec_Id) |
3804 | and then Comes_From_Source (N) | |
3805 | and then Is_Protected_Type (Current_Scope) | |
3806 | then | |
47bfea3a | 3807 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 3808 | end if; |
996ae0b0 | 3809 | |
c42aba6b AC |
3810 | -- If we are generating C and this is a function returning a constrained |
3811 | -- array type for which we must create a procedure with an extra out | |
c4dc2125 | 3812 | -- parameter, build and analyze the body now. The procedure declaration |
c42aba6b AC |
3813 | -- has already been created. We reuse the source body of the function, |
3814 | -- because in an instance it may contain global references that cannot | |
3815 | -- be reanalyzed. The source function itself is not used any further, | |
2a253c5b AC |
3816 | -- so we mark it as having a completion. If the subprogram is a stub the |
3817 | -- transformation is done later, when the proper body is analyzed. | |
c42aba6b AC |
3818 | |
3819 | if Expander_Active | |
3820 | and then Modify_Tree_For_C | |
3821 | and then Present (Spec_Id) | |
3822 | and then Ekind (Spec_Id) = E_Function | |
2a253c5b | 3823 | and then Nkind (N) /= N_Subprogram_Body_Stub |
c42aba6b AC |
3824 | and then Rewritten_For_C (Spec_Id) |
3825 | then | |
3826 | Set_Has_Completion (Spec_Id); | |
3827 | ||
3828 | Rewrite (N, Build_Procedure_Body_Form (Spec_Id, N)); | |
3829 | Analyze (N); | |
3830 | ||
c4dc2125 HK |
3831 | -- The entity for the created procedure must remain invisible, so it |
3832 | -- does not participate in resolution of subsequent references to the | |
3833 | -- function. | |
c42aba6b AC |
3834 | |
3835 | Set_Is_Immediately_Visible (Corresponding_Spec (N), False); | |
d65a80fd | 3836 | goto Leave; |
c42aba6b AC |
3837 | end if; |
3838 | ||
5334d18f | 3839 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 3840 | |
701b7fbb | 3841 | if Present (Spec_Id) then |
996ae0b0 | 3842 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 3843 | Verify_Overriding_Indicator; |
5d37ba92 ES |
3844 | |
3845 | -- In general, the spec will be frozen when we start analyzing the | |
3846 | -- body. However, for internally generated operations, such as | |
3847 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
3848 | -- results, the spec may not have been frozen by the time we expand |
3849 | -- the freeze actions that include the bodies. In particular, extra | |
3850 | -- formals for accessibility or for return-in-place may need to be | |
3851 | -- generated. Freeze nodes, if any, are inserted before the current | |
65f1ca2e AC |
3852 | -- body. These freeze actions are also needed in Compile_Only mode to |
3853 | -- enable the proper back-end type annotations. | |
901a52ba | 3854 | -- They are necessary in any case to ensure proper elaboration order |
36f2e3d3 | 3855 | -- in gigi. |
5d37ba92 | 3856 | |
084e3bd1 ES |
3857 | if Nkind (N) = N_Subprogram_Body |
3858 | and then Was_Expression_Function (N) | |
3859 | and then not Has_Completion (Spec_Id) | |
3860 | and then Serious_Errors_Detected = 0 | |
36f2e3d3 | 3861 | and then (Expander_Active |
901a52ba GD |
3862 | or else Operating_Mode = Check_Semantics |
3863 | or else Is_Ignored_Ghost_Entity (Spec_Id)) | |
5d37ba92 | 3864 | then |
a83d0680 AC |
3865 | -- The body generated for an expression function that is not a |
3866 | -- completion is a freeze point neither for the profile nor for | |
3867 | -- anything else. That's why, in order to prevent any freezing | |
3868 | -- during analysis, we need to mask types declared outside the | |
084e3bd1 | 3869 | -- expression (and in an outer scope) that are not yet frozen. |
901a52ba GD |
3870 | -- This also needs to be done in the case of an ignored Ghost |
3871 | -- expression function, where the expander isn't active. | |
a83d0680 | 3872 | |
084e3bd1 ES |
3873 | Set_Is_Frozen (Spec_Id); |
3874 | Mask_Types := Mask_Unfrozen_Types (Spec_Id); | |
3875 | ||
3876 | elsif not Is_Frozen (Spec_Id) | |
3877 | and then Serious_Errors_Detected = 0 | |
3878 | then | |
3879 | Set_Has_Delayed_Freeze (Spec_Id); | |
3880 | Freeze_Before (N, Spec_Id); | |
5d37ba92 | 3881 | end if; |
996ae0b0 RK |
3882 | end if; |
3883 | ||
aaa0a838 ES |
3884 | -- If the subprogram has a class-wide clone, build its body as a copy |
3885 | -- of the original body, and rewrite body of original subprogram as a | |
9b19c244 | 3886 | -- wrapper that calls the clone. If N is a stub, this construction will |
e4d29736 JM |
3887 | -- take place when the proper body is analyzed. No action needed if this |
3888 | -- subprogram has been eliminated. | |
aaa0a838 ES |
3889 | |
3890 | if Present (Spec_Id) | |
3891 | and then Present (Class_Wide_Clone (Spec_Id)) | |
3892 | and then (Comes_From_Source (N) or else Was_Expression_Function (N)) | |
6459a31f | 3893 | and then Nkind (N) /= N_Subprogram_Body_Stub |
e4d29736 | 3894 | and then not (Expander_Active and then Is_Eliminated (Spec_Id)) |
aaa0a838 ES |
3895 | then |
3896 | Build_Class_Wide_Clone_Body (Spec_Id, N); | |
3897 | ||
3898 | -- This is the new body for the existing primitive operation | |
3899 | ||
3900 | Rewrite (N, Build_Class_Wide_Clone_Call | |
3901 | (Sloc (N), New_List, Spec_Id, Parent (Spec_Id))); | |
3902 | Set_Has_Completion (Spec_Id, False); | |
3903 | Analyze (N); | |
3904 | return; | |
3905 | end if; | |
3906 | ||
996ae0b0 RK |
3907 | -- Place subprogram on scope stack, and make formals visible. If there |
3908 | -- is a spec, the visible entity remains that of the spec. | |
3909 | ||
3910 | if Present (Spec_Id) then | |
07fc65c4 | 3911 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
3912 | |
3913 | if Is_Child_Unit (Spec_Id) then | |
3914 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
3915 | end if; | |
3916 | ||
fbf5a39b AC |
3917 | if Style_Check then |
3918 | Style.Check_Identifier (Body_Id, Spec_Id); | |
3919 | end if; | |
996ae0b0 RK |
3920 | |
3921 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
3922 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3923 | ||
f937473f | 3924 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 3925 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
d65a80fd | 3926 | goto Leave; |
21d27997 | 3927 | |
996ae0b0 RK |
3928 | else |
3929 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
3930 | Set_Has_Completion (Spec_Id); | |
3931 | ||
3932 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 3933 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
3934 | end if; |
3935 | ||
3936 | -- If this is a body generated for a renaming, do not check for | |
3937 | -- full conformance. The check is redundant, because the spec of | |
3938 | -- the body is a copy of the spec in the renaming declaration, | |
3939 | -- and the test can lead to spurious errors on nested defaults. | |
3940 | ||
3941 | if Present (Spec_Decl) | |
996ae0b0 | 3942 | and then not Comes_From_Source (N) |
93a81b02 GB |
3943 | and then |
3944 | (Nkind (Original_Node (Spec_Decl)) = | |
4b6f99f5 | 3945 | N_Subprogram_Renaming_Declaration |
466c2127 AC |
3946 | or else (Present (Corresponding_Body (Spec_Decl)) |
3947 | and then | |
3948 | Nkind (Unit_Declaration_Node | |
3949 | (Corresponding_Body (Spec_Decl))) = | |
3950 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
3951 | then |
3952 | Conformant := True; | |
cabe9abc AC |
3953 | |
3954 | -- Conversely, the spec may have been generated for specless body | |
a6363ed3 AC |
3955 | -- with an inline pragma. The entity comes from source, which is |
3956 | -- both semantically correct and necessary for proper inlining. | |
3957 | -- The subprogram declaration itself is not in the source. | |
cabe9abc AC |
3958 | |
3959 | elsif Comes_From_Source (N) | |
a6363ed3 AC |
3960 | and then Present (Spec_Decl) |
3961 | and then not Comes_From_Source (Spec_Decl) | |
cabe9abc AC |
3962 | and then Has_Pragma_Inline (Spec_Id) |
3963 | then | |
3964 | Conformant := True; | |
76a69663 | 3965 | |
996ae0b0 RK |
3966 | else |
3967 | Check_Conformance | |
3968 | (Body_Id, Spec_Id, | |
76a69663 | 3969 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
3970 | end if; |
3971 | ||
3972 | -- If the body is not fully conformant, we have to decide if we | |
3973 | -- should analyze it or not. If it has a really messed up profile | |
3974 | -- then we probably should not analyze it, since we will get too | |
3975 | -- many bogus messages. | |
3976 | ||
3977 | -- Our decision is to go ahead in the non-fully conformant case | |
3978 | -- only if it is at least mode conformant with the spec. Note | |
3979 | -- that the call to Check_Fully_Conformant has issued the proper | |
3980 | -- error messages to complain about the lack of conformance. | |
3981 | ||
3982 | if not Conformant | |
3983 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
3984 | then | |
d65a80fd | 3985 | goto Leave; |
996ae0b0 RK |
3986 | end if; |
3987 | end if; | |
3988 | ||
3f89eb7f JS |
3989 | -- In the case we are dealing with an expression function we check |
3990 | -- the formals attached to the spec instead of the body - so we don't | |
3991 | -- reference body formals. | |
3992 | ||
3993 | if Spec_Id /= Body_Id | |
3994 | and then not Is_Expression_Function (Spec_Id) | |
3995 | then | |
fbf5a39b | 3996 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
3997 | end if; |
3998 | ||
579847c2 AC |
3999 | Set_Ekind (Body_Id, E_Subprogram_Body); |
4000 | ||
e28072cd AC |
4001 | if Nkind (N) = N_Subprogram_Body_Stub then |
4002 | Set_Corresponding_Spec_Of_Stub (N, Spec_Id); | |
4003 | ||
4004 | -- Regular body | |
4005 | ||
4006 | else | |
996ae0b0 | 4007 | Set_Corresponding_Spec (N, Spec_Id); |
758c442c | 4008 | |
5d37ba92 ES |
4009 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
4010 | -- of a concurrent type, the type of the first parameter has been | |
4011 | -- replaced with the corresponding record, which is the proper | |
4012 | -- run-time structure to use. However, within the body there may | |
4013 | -- be uses of the formals that depend on primitive operations | |
4014 | -- of the type (in particular calls in prefixed form) for which | |
4015 | -- we need the original concurrent type. The operation may have | |
4016 | -- several controlling formals, so the replacement must be done | |
4017 | -- for all of them. | |
758c442c GD |
4018 | |
4019 | if Comes_From_Source (Spec_Id) | |
4020 | and then Present (First_Entity (Spec_Id)) | |
4021 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
4022 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
15918371 AC |
4023 | and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
4024 | and then Present (Corresponding_Concurrent_Type | |
4025 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 4026 | then |
5d37ba92 ES |
4027 | declare |
4028 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
4029 | Form : Entity_Id; | |
4030 | ||
4031 | begin | |
4032 | Form := First_Formal (Spec_Id); | |
4033 | while Present (Form) loop | |
4034 | if Etype (Form) = Typ then | |
4035 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
4036 | end if; | |
4037 | ||
4038 | Next_Formal (Form); | |
4039 | end loop; | |
4040 | end; | |
758c442c GD |
4041 | end if; |
4042 | ||
21d27997 RD |
4043 | -- Make the formals visible, and place subprogram on scope stack. |
4044 | -- This is also the point at which we set Last_Real_Spec_Entity | |
4045 | -- to mark the entities which will not be moved to the body. | |
758c442c | 4046 | |
996ae0b0 | 4047 | Install_Formals (Spec_Id); |
21d27997 | 4048 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
616547fa AC |
4049 | |
4050 | -- Within an instance, add local renaming declarations so that | |
a5a809b2 | 4051 | -- gdb can retrieve the values of actuals more easily. This is |
65f1ca2e | 4052 | -- only relevant if generating code. |
616547fa AC |
4053 | |
4054 | if Is_Generic_Instance (Spec_Id) | |
4055 | and then Is_Wrapper_Package (Current_Scope) | |
a5a809b2 | 4056 | and then Expander_Active |
616547fa AC |
4057 | then |
4058 | Build_Subprogram_Instance_Renamings (N, Current_Scope); | |
4059 | end if; | |
4060 | ||
0a36105d | 4061 | Push_Scope (Spec_Id); |
996ae0b0 RK |
4062 | |
4063 | -- Make sure that the subprogram is immediately visible. For | |
4064 | -- child units that have no separate spec this is indispensable. | |
4065 | -- Otherwise it is safe albeit redundant. | |
4066 | ||
4067 | Set_Is_Immediately_Visible (Spec_Id); | |
4068 | end if; | |
4069 | ||
4070 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
ec4867fa | 4071 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
c9d70ab1 | 4072 | Set_Scope (Body_Id, Scope (Spec_Id)); |
996ae0b0 RK |
4073 | |
4074 | -- Case of subprogram body with no previous spec | |
4075 | ||
4076 | else | |
3e5daac4 AC |
4077 | -- Check for style warning required |
4078 | ||
996ae0b0 | 4079 | if Style_Check |
3e5daac4 AC |
4080 | |
4081 | -- Only apply check for source level subprograms for which checks | |
4082 | -- have not been suppressed. | |
4083 | ||
996ae0b0 RK |
4084 | and then Comes_From_Source (Body_Id) |
4085 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
4086 | |
4087 | -- No warnings within an instance | |
4088 | ||
996ae0b0 | 4089 | and then not In_Instance |
3e5daac4 | 4090 | |
b0186f71 | 4091 | -- No warnings for expression functions |
3e5daac4 | 4092 | |
b0186f71 | 4093 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
4094 | then |
4095 | Style.Body_With_No_Spec (N); | |
4096 | end if; | |
4097 | ||
4098 | New_Overloaded_Entity (Body_Id); | |
4099 | ||
4100 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
4101 | Set_Acts_As_Spec (N); | |
4102 | Generate_Definition (Body_Id); | |
fbf5a39b AC |
4103 | Generate_Reference |
4104 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
5e127570 AC |
4105 | |
4106 | -- If the body is an entry wrapper created for an entry with | |
ffa168bc | 4107 | -- preconditions, it must be compiled in the context of the |
5e127570 AC |
4108 | -- enclosing synchronized object, because it may mention other |
4109 | -- operations of the type. | |
4110 | ||
4111 | if Is_Entry_Wrapper (Body_Id) then | |
4112 | declare | |
4113 | Prot : constant Entity_Id := Etype (First_Entity (Body_Id)); | |
4114 | begin | |
4115 | Push_Scope (Prot); | |
4116 | Install_Declarations (Prot); | |
4117 | end; | |
4118 | end if; | |
4119 | ||
996ae0b0 | 4120 | Install_Formals (Body_Id); |
e949ee22 | 4121 | |
4a854847 | 4122 | Push_Scope (Body_Id); |
996ae0b0 | 4123 | end if; |
dbe36d67 AC |
4124 | |
4125 | -- For stubs and bodies with no previous spec, generate references to | |
4126 | -- formals. | |
4127 | ||
4128 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
4129 | end if; |
4130 | ||
2bfad6eb HK |
4131 | -- Entry barrier functions are generated outside the protected type and |
4132 | -- should not carry the SPARK_Mode of the enclosing context. | |
5216b599 | 4133 | |
877a5a12 AC |
4134 | if Nkind (N) = N_Subprogram_Body |
4135 | and then Is_Entry_Barrier_Function (N) | |
4136 | then | |
4137 | null; | |
2bfad6eb HK |
4138 | |
4139 | -- The body is generated as part of expression function expansion. When | |
4140 | -- the expression function appears in the visible declarations of a | |
4141 | -- package, the body is added to the private declarations. Since both | |
4142 | -- declarative lists may be subject to a different SPARK_Mode, inherit | |
4143 | -- the mode of the spec. | |
4144 | ||
4145 | -- package P with SPARK_Mode is | |
4146 | -- function Expr_Func ... is (...); -- original | |
4147 | -- [function Expr_Func ...;] -- generated spec | |
4148 | -- -- mode is ON | |
4149 | -- private | |
4150 | -- pragma SPARK_Mode (Off); | |
4151 | -- [function Expr_Func ... is return ...;] -- generated body | |
4152 | -- end P; -- mode is ON | |
4153 | ||
4154 | elsif not Comes_From_Source (N) | |
6e9e35e1 AC |
4155 | and then Present (Spec_Id) |
4156 | and then Is_Expression_Function (Spec_Id) | |
2bfad6eb | 4157 | then |
6e9e35e1 | 4158 | Set_SPARK_Pragma (Body_Id, SPARK_Pragma (Spec_Id)); |
2bfad6eb | 4159 | Set_SPARK_Pragma_Inherited |
6e9e35e1 | 4160 | (Body_Id, SPARK_Pragma_Inherited (Spec_Id)); |
2bfad6eb HK |
4161 | |
4162 | -- Set the SPARK_Mode from the current context (may be overwritten later | |
3f8c04e7 | 4163 | -- with explicit pragma). Exclude the case where the SPARK_Mode appears |
7f54dc83 | 4164 | -- initially on a stand-alone subprogram body, but is then relocated to |
3f8c04e7 AC |
4165 | -- a generated corresponding spec. In this scenario the mode is shared |
4166 | -- between the spec and body. | |
2bfad6eb | 4167 | |
3f8c04e7 | 4168 | elsif No (SPARK_Pragma (Body_Id)) then |
90e491a7 | 4169 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
877a5a12 AC |
4170 | Set_SPARK_Pragma_Inherited (Body_Id); |
4171 | end if; | |
5216b599 | 4172 | |
cf9a473e AC |
4173 | -- A subprogram body may be instantiated or inlined at a later pass. |
4174 | -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when it | |
4175 | -- applied to the initial declaration of the body. | |
4176 | ||
4177 | if Present (Spec_Id) then | |
4178 | if Ignore_SPARK_Mode_Pragmas (Spec_Id) then | |
4179 | Ignore_SPARK_Mode_Pragmas_In_Instance := True; | |
4180 | end if; | |
4181 | ||
4182 | else | |
4183 | -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in | |
4184 | -- case the body is instantiated or inlined later and out of context. | |
4185 | -- The body uses this attribute to restore the value of the global | |
4186 | -- flag. | |
4187 | ||
4188 | if Ignore_SPARK_Mode_Pragmas_In_Instance then | |
4189 | Set_Ignore_SPARK_Mode_Pragmas (Body_Id); | |
4190 | ||
4191 | elsif Ignore_SPARK_Mode_Pragmas (Body_Id) then | |
4192 | Ignore_SPARK_Mode_Pragmas_In_Instance := True; | |
4193 | end if; | |
4194 | end if; | |
4195 | ||
162ed06f HK |
4196 | -- Preserve relevant elaboration-related attributes of the context which |
4197 | -- are no longer available or very expensive to recompute once analysis, | |
4198 | -- resolution, and expansion are over. | |
4199 | ||
4200 | if No (Spec_Id) then | |
4201 | Mark_Elaboration_Attributes | |
4202 | (N_Id => Body_Id, | |
4203 | Checks => True, | |
4204 | Warnings => True); | |
4205 | end if; | |
4206 | ||
996ae0b0 RK |
4207 | -- If this is the proper body of a stub, we must verify that the stub |
4208 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 4209 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
4210 | -- only required for subprograms that come from source. |
4211 | ||
4212 | if Nkind (Parent (N)) = N_Subunit | |
4213 | and then Comes_From_Source (N) | |
4214 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
4215 | and then Nkind (Corresponding_Stub (Parent (N))) = |
4216 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
4217 | then |
4218 | declare | |
fbf5a39b AC |
4219 | Old_Id : constant Entity_Id := |
4220 | Defining_Entity | |
4221 | (Specification (Corresponding_Stub (Parent (N)))); | |
4222 | ||
996ae0b0 | 4223 | Conformant : Boolean := False; |
996ae0b0 RK |
4224 | |
4225 | begin | |
4226 | if No (Spec_Id) then | |
4227 | Check_Fully_Conformant (Body_Id, Old_Id); | |
4228 | ||
4229 | else | |
4230 | Check_Conformance | |
4231 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
4232 | ||
4233 | if not Conformant then | |
4234 | ||
dbe36d67 AC |
4235 | -- The stub was taken to be a new declaration. Indicate that |
4236 | -- it lacks a body. | |
996ae0b0 RK |
4237 | |
4238 | Set_Has_Completion (Old_Id, False); | |
4239 | end if; | |
4240 | end if; | |
4241 | end; | |
4242 | end if; | |
4243 | ||
4244 | Set_Has_Completion (Body_Id); | |
4245 | Check_Eliminated (Body_Id); | |
4246 | ||
caf07df9 AC |
4247 | -- Analyze any aspect specifications that appear on the subprogram body |
4248 | -- stub. Stop the analysis now as the stub does not have a declarative | |
4249 | -- or a statement part, and it cannot be inlined. | |
c8a3028c | 4250 | |
caf07df9 | 4251 | if Nkind (N) = N_Subprogram_Body_Stub then |
c8a3028c | 4252 | if Has_Aspects (N) then |
e9d08fd7 | 4253 | Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
c8a3028c AC |
4254 | end if; |
4255 | ||
d65a80fd | 4256 | goto Leave; |
84f4072a | 4257 | end if; |
996ae0b0 | 4258 | |
9cc6b3f8 | 4259 | -- Handle inlining |
84f4072a | 4260 | |
b94b6c56 RD |
4261 | -- Note: Normally we don't do any inlining if expansion is off, since |
4262 | -- we won't generate code in any case. An exception arises in GNATprove | |
2d180af1 YM |
4263 | -- mode where we want to expand some calls in place, even with expansion |
4264 | -- disabled, since the inlining eases formal verification. | |
ecad37f3 | 4265 | |
6c26bac2 AC |
4266 | if not GNATprove_Mode |
4267 | and then Expander_Active | |
4268 | and then Serious_Errors_Detected = 0 | |
4269 | and then Present (Spec_Id) | |
4270 | and then Has_Pragma_Inline (Spec_Id) | |
4271 | then | |
ca90b962 | 4272 | -- Legacy implementation (relying on front-end inlining) |
84f4072a | 4273 | |
6c26bac2 | 4274 | if not Back_End_Inlining then |
17ce1f52 | 4275 | if (Has_Pragma_Inline_Always (Spec_Id) |
9cc6b3f8 EB |
4276 | and then not Opt.Disable_FE_Inline_Always) |
4277 | or else (Front_End_Inlining | |
4278 | and then not Opt.Disable_FE_Inline) | |
6c26bac2 AC |
4279 | then |
4280 | Build_Body_To_Inline (N, Spec_Id); | |
4281 | end if; | |
f087ea44 | 4282 | |
9cc6b3f8 | 4283 | -- New implementation (relying on back-end inlining) |
f087ea44 | 4284 | |
6c26bac2 AC |
4285 | else |
4286 | if Has_Pragma_Inline_Always (Spec_Id) | |
4287 | or else Optimization_Level > 0 | |
4288 | then | |
4289 | -- Handle function returning an unconstrained type | |
f087ea44 | 4290 | |
6c26bac2 AC |
4291 | if Comes_From_Source (Body_Id) |
4292 | and then Ekind (Spec_Id) = E_Function | |
4293 | and then Returns_Unconstrained_Type (Spec_Id) | |
5c5e108f AC |
4294 | |
4295 | -- If function builds in place, i.e. returns a limited type, | |
4296 | -- inlining cannot be done. | |
4297 | ||
4298 | and then not Is_Limited_Type (Etype (Spec_Id)) | |
6c26bac2 | 4299 | then |
16b10ccc | 4300 | Check_And_Split_Unconstrained_Function (N, Spec_Id, Body_Id); |
84f4072a | 4301 | |
6c26bac2 AC |
4302 | else |
4303 | declare | |
b80a2b4b AC |
4304 | Subp_Body : constant Node_Id := |
4305 | Unit_Declaration_Node (Body_Id); | |
6c26bac2 | 4306 | Subp_Decl : constant List_Id := Declarations (Subp_Body); |
84f4072a | 4307 | |
6c26bac2 AC |
4308 | begin |
4309 | -- Do not pass inlining to the backend if the subprogram | |
4310 | -- has declarations or statements which cannot be inlined | |
4311 | -- by the backend. This check is done here to emit an | |
4312 | -- error instead of the generic warning message reported | |
4313 | -- by the GCC backend (ie. "function might not be | |
4314 | -- inlinable"). | |
4315 | ||
4316 | if Present (Subp_Decl) | |
4317 | and then Has_Excluded_Declaration (Spec_Id, Subp_Decl) | |
4318 | then | |
4319 | null; | |
4320 | ||
4321 | elsif Has_Excluded_Statement | |
4322 | (Spec_Id, | |
4323 | Statements | |
4324 | (Handled_Statement_Sequence (Subp_Body))) | |
4325 | then | |
4326 | null; | |
4327 | ||
4328 | -- If the backend inlining is available then at this | |
4329 | -- stage we only have to mark the subprogram as inlined. | |
4330 | -- The expander will take care of registering it in the | |
4331 | -- table of subprograms inlined by the backend a part of | |
4332 | -- processing calls to it (cf. Expand_Call) | |
4333 | ||
4334 | else | |
4335 | Set_Is_Inlined (Spec_Id); | |
4336 | end if; | |
4337 | end; | |
4338 | end if; | |
4339 | end if; | |
4340 | end if; | |
2d180af1 YM |
4341 | |
4342 | -- In GNATprove mode, inline only when there is a separate subprogram | |
4343 | -- declaration for now, as inlining of subprogram bodies acting as | |
ca90b962 | 4344 | -- declarations, or subprogram stubs, are not supported by front-end |
2d180af1 | 4345 | -- inlining. This inlining should occur after analysis of the body, so |
d29f68cf AC |
4346 | -- that it is known whether the value of SPARK_Mode, which can be |
4347 | -- defined by a pragma inside the body, is applicable to the body. | |
c1025b4e | 4348 | -- Inlining can be disabled with switch -gnatdm |
2d180af1 YM |
4349 | |
4350 | elsif GNATprove_Mode | |
2d180af1 YM |
4351 | and then Full_Analysis |
4352 | and then not Inside_A_Generic | |
4353 | and then Present (Spec_Id) | |
7c4d86c9 AC |
4354 | and then |
4355 | Nkind (Unit_Declaration_Node (Spec_Id)) = N_Subprogram_Declaration | |
fd22e260 | 4356 | and then Body_Has_SPARK_Mode_On |
2d180af1 | 4357 | and then Can_Be_Inlined_In_GNATprove_Mode (Spec_Id, Body_Id) |
ac072cb2 | 4358 | and then not Body_Has_Contract |
c1025b4e | 4359 | and then not Debug_Flag_M |
2d180af1 | 4360 | then |
6c26bac2 | 4361 | Build_Body_To_Inline (N, Spec_Id); |
996ae0b0 RK |
4362 | end if; |
4363 | ||
0d6014fa | 4364 | -- When generating code, inherited pre/postconditions are handled when |
0f6251c7 | 4365 | -- expanding the corresponding contract. |
539ca5ec | 4366 | |
0ab80019 | 4367 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 4368 | -- of the specification we have to install the private withed units. |
21d27997 | 4369 | -- This holds for child units as well. |
9bc856dd AC |
4370 | |
4371 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 4372 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
4373 | then |
4374 | Install_Private_With_Clauses (Body_Id); | |
4375 | end if; | |
4376 | ||
ec4867fa ES |
4377 | Check_Anonymous_Return; |
4378 | ||
fdce4bb7 JM |
4379 | -- Set the Protected_Formal field of each extra formal of the protected |
4380 | -- subprogram to reference the corresponding extra formal of the | |
4381 | -- subprogram that implements it. For regular formals this occurs when | |
4382 | -- the protected subprogram's declaration is expanded, but the extra | |
4383 | -- formals don't get created until the subprogram is frozen. We need to | |
4384 | -- do this before analyzing the protected subprogram's body so that any | |
4385 | -- references to the original subprogram's extra formals will be changed | |
4386 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
4387 | ||
4388 | if Present (Spec_Id) | |
4389 | and then Is_Protected_Type (Scope (Spec_Id)) | |
4390 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
4391 | then | |
4392 | declare | |
4393 | Impl_Subp : constant Entity_Id := | |
4394 | Protected_Body_Subprogram (Spec_Id); | |
4395 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
4396 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
cf9a473e | 4397 | |
fdce4bb7 JM |
4398 | begin |
4399 | while Present (Prot_Ext_Formal) loop | |
4400 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 4401 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
4402 | Next_Formal_With_Extras (Prot_Ext_Formal); |
4403 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
4404 | end loop; | |
4405 | end; | |
4406 | end if; | |
4407 | ||
43b26411 JS |
4408 | -- Generate minimum accessibility local objects to correspond with |
4409 | -- any extra formal added for anonymous access types. This new local | |
4410 | -- object can then be used instead of the formal in case it is used | |
4411 | -- in an actual to a call to a nested subprogram. | |
4412 | ||
60f66f34 GD |
4413 | -- This method is used to supplement our "small integer model" for |
4414 | -- accessibility-check generation (for more information see | |
43b26411 JS |
4415 | -- Dynamic_Accessibility_Level). |
4416 | ||
60f66f34 | 4417 | -- Because we allow accessibility values greater than our expected value |
43b26411 JS |
4418 | -- passing along the same extra accessibility formal as an actual |
4419 | -- to a nested subprogram becomes a problem because high values mean | |
4420 | -- different things to the callee even though they are the same to the | |
4421 | -- caller. So, as described in the first section, we create a local | |
4422 | -- object representing the minimum of the accessibility level value that | |
4423 | -- is passed in and the accessibility level of the callee's parameter | |
4424 | -- and locals and use it in the case of a call to a nested subprogram. | |
4425 | -- This generated object is refered to as a "minimum accessiblity | |
4426 | -- level." | |
4427 | ||
4428 | if Present (Spec_Id) or else Present (Body_Id) then | |
4429 | Body_Nod := Unit_Declaration_Node (Body_Id); | |
4430 | ||
4431 | declare | |
4432 | Form : Entity_Id; | |
4433 | begin | |
4434 | -- Grab the appropriate formal depending on whether there exists | |
4435 | -- an actual spec for the subprogram or whether we are dealing | |
4436 | -- with a protected subprogram. | |
4437 | ||
4438 | if Present (Spec_Id) then | |
4439 | if Present (Protected_Body_Subprogram (Spec_Id)) then | |
4440 | Form := First_Formal (Protected_Body_Subprogram (Spec_Id)); | |
4441 | else | |
4442 | Form := First_Formal (Spec_Id); | |
4443 | end if; | |
4444 | else | |
4445 | Form := First_Formal (Body_Id); | |
4446 | end if; | |
4447 | ||
4448 | -- Loop through formals if the subprogram is capable of accepting | |
4449 | -- a generated local object. If it is not then it is also not | |
4450 | -- capable of having local subprograms meaning it would not need | |
4451 | -- a minimum accessibility level object anyway. | |
4452 | ||
4453 | if Present (Body_Nod) | |
4454 | and then Has_Declarations (Body_Nod) | |
4455 | and then Nkind (Body_Nod) /= N_Package_Specification | |
4456 | then | |
4457 | while Present (Form) loop | |
4458 | ||
4459 | if Present (Extra_Accessibility (Form)) | |
4460 | and then No (Minimum_Accessibility (Form)) | |
4461 | then | |
4462 | -- Generate the minimum accessibility level object | |
4463 | ||
4464 | -- A60b : integer := integer'min(2, paramL); | |
4465 | ||
4466 | declare | |
4467 | Loc : constant Source_Ptr := Sloc (Body_Nod); | |
4468 | Obj_Node : constant Node_Id := | |
4469 | Make_Object_Declaration (Loc, | |
4470 | Defining_Identifier => | |
4471 | Make_Temporary | |
4472 | (Loc, 'A', Extra_Accessibility (Form)), | |
4473 | Object_Definition => New_Occurrence_Of | |
4474 | (Standard_Integer, Loc), | |
4475 | Expression => | |
4476 | Make_Attribute_Reference (Loc, | |
4477 | Prefix => New_Occurrence_Of | |
4478 | (Standard_Integer, Loc), | |
4479 | Attribute_Name => Name_Min, | |
4480 | Expressions => New_List ( | |
4481 | Make_Integer_Literal (Loc, | |
4482 | Object_Access_Level (Form)), | |
4483 | New_Occurrence_Of | |
4484 | (Extra_Accessibility (Form), Loc)))); | |
4485 | begin | |
4486 | -- Add the new local object to the Minimum_Acc_Obj to | |
4487 | -- be later prepended to the subprogram's list of | |
4488 | -- declarations after we are sure all expansion is | |
4489 | -- done. | |
4490 | ||
4491 | if Present (Minimum_Acc_Objs) then | |
4492 | Prepend (Obj_Node, Minimum_Acc_Objs); | |
4493 | else | |
4494 | Minimum_Acc_Objs := New_List (Obj_Node); | |
4495 | end if; | |
4496 | ||
4497 | -- Register the object and analyze it | |
4498 | ||
4499 | Set_Minimum_Accessibility | |
4500 | (Form, Defining_Identifier (Obj_Node)); | |
4501 | ||
4502 | Analyze (Obj_Node); | |
4503 | end; | |
4504 | end if; | |
4505 | ||
4506 | Next_Formal (Form); | |
4507 | end loop; | |
4508 | end if; | |
4509 | end; | |
4510 | end if; | |
4511 | ||
0868e09c | 4512 | -- Now we can go on to analyze the body |
996ae0b0 RK |
4513 | |
4514 | HSS := Handled_Statement_Sequence (N); | |
4515 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 4516 | |
f3d0f304 | 4517 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
4518 | -- for discriminals and privals and finally a declaration for the entry |
4519 | -- family index (if applicable). This form of early expansion is done | |
4520 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 | 4521 | -- references entities which were created during regular expansion. The |
3b8056a5 AC |
4522 | -- subprogram entity must come from source, and not be an internally |
4523 | -- generated subprogram. | |
21d27997 | 4524 | |
4460a9bc | 4525 | if Expander_Active |
21d27997 RD |
4526 | and then Present (Prot_Typ) |
4527 | and then Present (Spec_Id) | |
3b8056a5 | 4528 | and then Comes_From_Source (Spec_Id) |
21d27997 RD |
4529 | and then not Is_Eliminated (Spec_Id) |
4530 | then | |
4531 | Install_Private_Data_Declarations | |
4532 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
4533 | end if; | |
4534 | ||
5dcab3ca AC |
4535 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
4536 | -- may now appear in parameter and result profiles. Since the analysis | |
4537 | -- of a subprogram body may use the parameter and result profile of the | |
4538 | -- spec, swap any limited views with their non-limited counterpart. | |
4539 | ||
128a98ea | 4540 | if Ada_Version >= Ada_2012 and then Present (Spec_Id) then |
1e55d29a | 4541 | Exch_Views := Exchange_Limited_Views (Spec_Id); |
5dcab3ca AC |
4542 | end if; |
4543 | ||
128a98ea EB |
4544 | -- If the return type is an anonymous access type whose designated type |
4545 | -- is the limited view of a class-wide type and the non-limited view is | |
4546 | -- available, update the return type accordingly. | |
4547 | ||
4548 | if Ada_Version >= Ada_2005 and then Present (Spec_Id) then | |
4549 | declare | |
4550 | Etyp : Entity_Id; | |
4551 | Rtyp : Entity_Id; | |
4552 | ||
4553 | begin | |
4554 | Rtyp := Etype (Spec_Id); | |
4555 | ||
4556 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
4557 | Etyp := Directly_Designated_Type (Rtyp); | |
4558 | ||
4559 | if Is_Class_Wide_Type (Etyp) | |
4560 | and then From_Limited_With (Etyp) | |
4561 | then | |
4562 | Desig_View := Etyp; | |
4563 | Set_Directly_Designated_Type (Rtyp, Available_View (Etyp)); | |
4564 | end if; | |
4565 | end if; | |
4566 | end; | |
4567 | end if; | |
4568 | ||
c8a3028c AC |
4569 | -- Analyze any aspect specifications that appear on the subprogram body |
4570 | ||
4571 | if Has_Aspects (N) then | |
e9d08fd7 | 4572 | Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
c8a3028c | 4573 | end if; |
378dc6ca | 4574 | |
996ae0b0 | 4575 | Analyze_Declarations (Declarations (N)); |
21d27997 | 4576 | |
f3124d8f | 4577 | -- Verify that the SPARK_Mode of the body agrees with that of its spec |
f90d14ac | 4578 | |
f1c7be38 | 4579 | if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then |
f90d14ac | 4580 | if Present (SPARK_Pragma (Spec_Id)) then |
933aa0ac | 4581 | if Get_SPARK_Mode_From_Annotation (SPARK_Pragma (Spec_Id)) = Off |
f90d14ac | 4582 | and then |
933aa0ac | 4583 | Get_SPARK_Mode_From_Annotation (SPARK_Pragma (Body_Id)) = On |
f90d14ac AC |
4584 | then |
4585 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
4586 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
4587 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); | |
4588 | Error_Msg_NE | |
f3124d8f | 4589 | ("\value Off was set for SPARK_Mode on & #", N, Spec_Id); |
f90d14ac AC |
4590 | end if; |
4591 | ||
4592 | elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then | |
4593 | null; | |
4594 | ||
93b3110d YM |
4595 | -- SPARK_Mode Off could complete no SPARK_Mode in a generic, either |
4596 | -- as specified in source code, or because SPARK_Mode On is ignored | |
4597 | -- in an instance where the context is SPARK_Mode Off/Auto. | |
4598 | ||
4599 | elsif Get_SPARK_Mode_From_Annotation (SPARK_Pragma (Body_Id)) = Off | |
4600 | and then (Is_Generic_Unit (Spec_Id) or else In_Instance) | |
4601 | then | |
4602 | null; | |
4603 | ||
f90d14ac AC |
4604 | else |
4605 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3ccedacc | 4606 | Error_Msg_N ("incorrect application of SPARK_Mode #", N); |
f90d14ac | 4607 | Error_Msg_Sloc := Sloc (Spec_Id); |
f3124d8f HK |
4608 | Error_Msg_NE |
4609 | ("\no value was set for SPARK_Mode on & #", N, Spec_Id); | |
f90d14ac AC |
4610 | end if; |
4611 | end if; | |
4612 | ||
65e5747e | 4613 | -- A subprogram body freezes its own contract. Analyze the contract |
879ac954 AC |
4614 | -- after the declarations of the body have been processed as pragmas |
4615 | -- are now chained on the contract of the subprogram body. | |
c9d70ab1 | 4616 | |
f99ff327 | 4617 | Analyze_Entry_Or_Subprogram_Body_Contract (Body_Id); |
c9d70ab1 | 4618 | |
21d27997 RD |
4619 | -- Check completion, and analyze the statements |
4620 | ||
996ae0b0 | 4621 | Check_Completion; |
33931112 | 4622 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 4623 | Analyze (HSS); |
21d27997 | 4624 | |
43b26411 JS |
4625 | -- Add the generated minimum accessibility objects to the subprogram |
4626 | -- body's list of declarations after analysis of the statements and | |
4627 | -- contracts. | |
4628 | ||
4629 | while Is_Non_Empty_List (Minimum_Acc_Objs) loop | |
4630 | if Present (Declarations (Body_Nod)) then | |
4631 | Prepend (Remove_Head (Minimum_Acc_Objs), Declarations (Body_Nod)); | |
4632 | else | |
4633 | Set_Declarations | |
4634 | (Body_Nod, New_List (Remove_Head (Minimum_Acc_Objs))); | |
4635 | end if; | |
4636 | end loop; | |
4637 | ||
21d27997 RD |
4638 | -- Deal with end of scope processing for the body |
4639 | ||
07fc65c4 | 4640 | Process_End_Label (HSS, 't', Current_Scope); |
851e9f19 | 4641 | Update_Use_Clause_Chain; |
996ae0b0 | 4642 | End_Scope; |
5e127570 AC |
4643 | |
4644 | -- If we are compiling an entry wrapper, remove the enclosing | |
ffa168bc | 4645 | -- synchronized object from the stack. |
5e127570 AC |
4646 | |
4647 | if Is_Entry_Wrapper (Body_Id) then | |
4648 | End_Scope; | |
4649 | end if; | |
4650 | ||
996ae0b0 | 4651 | Check_Subprogram_Order (N); |
c37bb106 | 4652 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
4653 | |
4654 | -- If we have a separate spec, then the analysis of the declarations | |
4655 | -- caused the entities in the body to be chained to the spec id, but | |
4656 | -- we want them chained to the body id. Only the formal parameters | |
4657 | -- end up chained to the spec id in this case. | |
4658 | ||
4659 | if Present (Spec_Id) then | |
4660 | ||
d39d6bb8 | 4661 | -- We must conform to the categorization of our spec |
996ae0b0 | 4662 | |
d39d6bb8 | 4663 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 4664 | |
d39d6bb8 RD |
4665 | -- And if this is a child unit, the parent units must conform |
4666 | ||
4667 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
4668 | Validate_Categorization_Dependency |
4669 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
4670 | end if; | |
4671 | ||
21d27997 RD |
4672 | -- Here is where we move entities from the spec to the body |
4673 | ||
4674 | -- Case where there are entities that stay with the spec | |
4675 | ||
4676 | if Present (Last_Real_Spec_Entity) then | |
4677 | ||
dbe36d67 AC |
4678 | -- No body entities (happens when the only real spec entities come |
4679 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
4680 | |
4681 | if No (Last_Entity (Body_Id)) then | |
7c4d86c9 | 4682 | Set_First_Entity (Body_Id, Next_Entity (Last_Real_Spec_Entity)); |
21d27997 RD |
4683 | |
4684 | -- Body entities present (formals), so chain stuff past them | |
4685 | ||
4686 | else | |
3f6d1daa | 4687 | Link_Entities |
21d27997 RD |
4688 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); |
4689 | end if; | |
4690 | ||
4691 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 4692 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
4693 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
4694 | ||
dbe36d67 AC |
4695 | -- Case where there are no spec entities, in this case there can be |
4696 | -- no body entities either, so just move everything. | |
996ae0b0 | 4697 | |
a921e83c AC |
4698 | -- If the body is generated for an expression function, it may have |
4699 | -- been preanalyzed already, if 'access was applied to it. | |
4700 | ||
996ae0b0 | 4701 | else |
a921e83c AC |
4702 | if Nkind (Original_Node (Unit_Declaration_Node (Spec_Id))) /= |
4703 | N_Expression_Function | |
4704 | then | |
4705 | pragma Assert (No (Last_Entity (Body_Id))); | |
4706 | null; | |
4707 | end if; | |
4708 | ||
996ae0b0 RK |
4709 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
4710 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
4711 | Set_First_Entity (Spec_Id, Empty); | |
4712 | Set_Last_Entity (Spec_Id, Empty); | |
4713 | end if; | |
ed27b86b HK |
4714 | |
4715 | -- Otherwise the body does not complete a previous declaration. Check | |
4716 | -- the categorization of the body against the units it withs. | |
4717 | ||
4718 | else | |
4719 | Validate_Categorization_Dependency (N, Body_Id); | |
996ae0b0 RK |
4720 | end if; |
4721 | ||
7665e4bd | 4722 | Check_Missing_Return; |
996ae0b0 | 4723 | |
82c80734 | 4724 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
4725 | -- the body of the procedure. But first we deal with a special case |
4726 | -- where we want to modify this check. If the body of the subprogram | |
4727 | -- starts with a raise statement or its equivalent, or if the body | |
cf3e6845 AC |
4728 | -- consists entirely of a null statement, then it is pretty obvious that |
4729 | -- it is OK to not reference the parameters. For example, this might be | |
4730 | -- the following common idiom for a stubbed function: statement of the | |
4731 | -- procedure raises an exception. In particular this deals with the | |
4732 | -- common idiom of a stubbed function, which appears something like: | |
fbf5a39b AC |
4733 | |
4734 | -- function F (A : Integer) return Some_Type; | |
4735 | -- X : Some_Type; | |
4736 | -- begin | |
4737 | -- raise Program_Error; | |
4738 | -- return X; | |
4739 | -- end F; | |
4740 | ||
76a69663 ES |
4741 | -- Here the purpose of X is simply to satisfy the annoying requirement |
4742 | -- in Ada that there be at least one return, and we certainly do not | |
a90bd866 | 4743 | -- want to go posting warnings on X that it is not initialized. On |
76a69663 ES |
4744 | -- the other hand, if X is entirely unreferenced that should still |
4745 | -- get a warning. | |
4746 | ||
4747 | -- What we do is to detect these cases, and if we find them, flag the | |
4748 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
4749 | -- suppress unwanted warnings. For the case of the function stub above | |
4750 | -- we have a special test to set X as apparently assigned to suppress | |
4751 | -- the warning. | |
996ae0b0 RK |
4752 | |
4753 | declare | |
800621e0 | 4754 | Stm : Node_Id; |
996ae0b0 RK |
4755 | |
4756 | begin | |
90e491a7 PMR |
4757 | -- Skip call markers installed by the ABE mechanism, labels, and |
4758 | -- Push_xxx_Error_Label to find the first real statement. | |
fbf5a39b | 4759 | |
800621e0 | 4760 | Stm := First (Statements (HSS)); |
90e491a7 | 4761 | while Nkind_In (Stm, N_Call_Marker, N_Label) |
0a36105d JM |
4762 | or else Nkind (Stm) in N_Push_xxx_Label |
4763 | loop | |
996ae0b0 | 4764 | Next (Stm); |
0a36105d | 4765 | end loop; |
996ae0b0 | 4766 | |
fbf5a39b AC |
4767 | -- Do the test on the original statement before expansion |
4768 | ||
4769 | declare | |
4770 | Ostm : constant Node_Id := Original_Node (Stm); | |
4771 | ||
4772 | begin | |
76a69663 | 4773 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
4774 | |
4775 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
4776 | Set_Trivial_Subprogram (Stm); |
4777 | ||
f3d57416 | 4778 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
4779 | |
4780 | elsif Nkind (Stm) = N_Null_Statement | |
4781 | and then Comes_From_Source (Stm) | |
4782 | and then No (Next (Stm)) | |
4783 | then | |
4784 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
4785 | |
4786 | -- Check for explicit call cases which likely raise an exception | |
4787 | ||
4788 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
4789 | if Is_Entity_Name (Name (Ostm)) then | |
4790 | declare | |
4791 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
4792 | ||
4793 | begin | |
4794 | -- If the procedure is marked No_Return, then likely it | |
4795 | -- raises an exception, but in any case it is not coming | |
76a69663 | 4796 | -- back here, so turn on the flag. |
fbf5a39b | 4797 | |
f46faa08 AC |
4798 | if Present (Ent) |
4799 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
4800 | and then No_Return (Ent) |
4801 | then | |
76a69663 | 4802 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
4803 | end if; |
4804 | end; | |
4805 | end if; | |
4806 | end if; | |
4807 | end; | |
996ae0b0 RK |
4808 | end; |
4809 | ||
4810 | -- Check for variables that are never modified | |
4811 | ||
4812 | declare | |
d65a80fd HK |
4813 | E1 : Entity_Id; |
4814 | E2 : Entity_Id; | |
996ae0b0 RK |
4815 | |
4816 | begin | |
fbf5a39b | 4817 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
4818 | -- flags from out parameters to the corresponding entities in the |
4819 | -- body. The reason we do that is we want to post error flags on | |
4820 | -- the body entities, not the spec entities. | |
4821 | ||
4822 | if Present (Spec_Id) then | |
4823 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
4824 | while Present (E1) loop |
4825 | if Ekind (E1) = E_Out_Parameter then | |
4826 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 4827 | while Present (E2) loop |
996ae0b0 RK |
4828 | exit when Chars (E1) = Chars (E2); |
4829 | Next_Entity (E2); | |
4830 | end loop; | |
4831 | ||
fbf5a39b AC |
4832 | if Present (E2) then |
4833 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
4834 | end if; | |
996ae0b0 RK |
4835 | end if; |
4836 | ||
4837 | Next_Entity (E1); | |
4838 | end loop; | |
4839 | end if; | |
4840 | ||
3f89eb7f JS |
4841 | -- Check references of the subprogram spec when we are dealing with |
4842 | -- an expression function due to it having a generated body. | |
4843 | -- Otherwise, we simply check the formals of the subprogram body. | |
0868e09c | 4844 | |
3f89eb7f JS |
4845 | if Present (Spec_Id) |
4846 | and then Is_Expression_Function (Spec_Id) | |
4847 | then | |
4848 | Check_References (Spec_Id); | |
4849 | else | |
4850 | Check_References (Body_Id); | |
4851 | end if; | |
996ae0b0 | 4852 | end; |
5a271a7f RD |
4853 | |
4854 | -- Check for nested subprogram, and mark outer level subprogram if so | |
4855 | ||
4856 | declare | |
4857 | Ent : Entity_Id; | |
4858 | ||
4859 | begin | |
4860 | if Present (Spec_Id) then | |
4861 | Ent := Spec_Id; | |
4862 | else | |
4863 | Ent := Body_Id; | |
4864 | end if; | |
4865 | ||
4866 | loop | |
4867 | Ent := Enclosing_Subprogram (Ent); | |
4868 | exit when No (Ent) or else Is_Subprogram (Ent); | |
4869 | end loop; | |
4870 | ||
4871 | if Present (Ent) then | |
4872 | Set_Has_Nested_Subprogram (Ent); | |
4873 | end if; | |
4874 | end; | |
241ebe89 | 4875 | |
1e55d29a EB |
4876 | -- Restore the limited views in the spec, if any, to let the back end |
4877 | -- process it without running into circularities. | |
4878 | ||
4879 | if Exch_Views /= No_Elist then | |
4880 | Restore_Limited_Views (Exch_Views); | |
4881 | end if; | |
4882 | ||
a83d0680 AC |
4883 | if Mask_Types /= No_Elist then |
4884 | Unmask_Unfrozen_Types (Mask_Types); | |
4885 | end if; | |
4886 | ||
128a98ea EB |
4887 | if Present (Desig_View) then |
4888 | Set_Directly_Designated_Type (Etype (Spec_Id), Desig_View); | |
4889 | end if; | |
4890 | ||
d65a80fd | 4891 | <<Leave>> |
d71b0a9a YM |
4892 | if Present (Ignored_Ghost_Region) then |
4893 | Expander_Active := Saved_EA; | |
4894 | end if; | |
4895 | ||
f9a8f910 | 4896 | Ignore_SPARK_Mode_Pragmas_In_Instance := Saved_ISMP; |
9057bd6a | 4897 | Restore_Ghost_Region (Saved_GM, Saved_IGR); |
b1b543d2 | 4898 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 RK |
4899 | |
4900 | ------------------------------------ | |
4901 | -- Analyze_Subprogram_Declaration -- | |
4902 | ------------------------------------ | |
4903 | ||
4904 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
579847c2 | 4905 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc | 4906 | Designator : Entity_Id; |
579847c2 | 4907 | |
4d8f3296 ES |
4908 | Is_Completion : Boolean; |
4909 | -- Indicates whether a null procedure declaration is a completion | |
996ae0b0 RK |
4910 | |
4911 | begin | |
2ba431e5 | 4912 | -- Null procedures are not allowed in SPARK |
daec8eeb | 4913 | |
fe5d3068 | 4914 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
4915 | and then Null_Present (Specification (N)) |
4916 | then | |
ce5ba43a | 4917 | Check_SPARK_05_Restriction ("null procedure is not allowed", N); |
718deaf1 | 4918 | |
73cc8f62 RD |
4919 | -- Null procedures are allowed in protected types, following the |
4920 | -- recent AI12-0147. | |
b741083a ES |
4921 | |
4922 | if Is_Protected_Type (Current_Scope) | |
4923 | and then Ada_Version < Ada_2012 | |
4924 | then | |
4d8f3296 ES |
4925 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
4926 | end if; | |
718deaf1 | 4927 | |
4d8f3296 | 4928 | Analyze_Null_Procedure (N, Is_Completion); |
718deaf1 | 4929 | |
241ebe89 | 4930 | -- The null procedure acts as a body, nothing further is needed |
5d5832bc | 4931 | |
241ebe89 | 4932 | if Is_Completion then |
4d8f3296 | 4933 | return; |
5d5832bc AC |
4934 | end if; |
4935 | end if; | |
4936 | ||
beacce02 | 4937 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
4938 | |
4939 | -- A reference may already have been generated for the unit name, in | |
4940 | -- which case the following call is redundant. However it is needed for | |
4941 | -- declarations that are the rewriting of an expression function. | |
4942 | ||
5d5832bc AC |
4943 | Generate_Definition (Designator); |
4944 | ||
877a5a12 AC |
4945 | -- Set the SPARK mode from the current context (may be overwritten later |
4946 | -- with explicit pragma). This is not done for entry barrier functions | |
4947 | -- because they are generated outside the protected type and should not | |
4948 | -- carry the mode of the enclosing context. | |
4a854847 | 4949 | |
877a5a12 AC |
4950 | if Nkind (N) = N_Subprogram_Declaration |
4951 | and then Is_Entry_Barrier_Function (N) | |
4952 | then | |
4953 | null; | |
90e491a7 | 4954 | |
877a5a12 | 4955 | else |
90e491a7 | 4956 | Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
877a5a12 AC |
4957 | Set_SPARK_Pragma_Inherited (Designator); |
4958 | end if; | |
579847c2 | 4959 | |
cf9a473e AC |
4960 | -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case |
4961 | -- the body of this subprogram is instantiated or inlined later and out | |
4962 | -- of context. The body uses this attribute to restore the value of the | |
4963 | -- global flag. | |
4964 | ||
4965 | if Ignore_SPARK_Mode_Pragmas_In_Instance then | |
4966 | Set_Ignore_SPARK_Mode_Pragmas (Designator); | |
4967 | end if; | |
4968 | ||
90e491a7 PMR |
4969 | -- Preserve relevant elaboration-related attributes of the context which |
4970 | -- are no longer available or very expensive to recompute once analysis, | |
4971 | -- resolution, and expansion are over. | |
4972 | ||
4973 | Mark_Elaboration_Attributes | |
162ed06f HK |
4974 | (N_Id => Designator, |
4975 | Checks => True, | |
4976 | Warnings => True); | |
90e491a7 | 4977 | |
b1b543d2 BD |
4978 | if Debug_Flag_C then |
4979 | Write_Str ("==> subprogram spec "); | |
4980 | Write_Name (Chars (Designator)); | |
4981 | Write_Str (" from "); | |
4982 | Write_Location (Sloc (N)); | |
4983 | Write_Eol; | |
4984 | Indent; | |
4985 | end if; | |
4986 | ||
996ae0b0 | 4987 | Validate_RCI_Subprogram_Declaration (N); |
996ae0b0 RK |
4988 | New_Overloaded_Entity (Designator); |
4989 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 4990 | |
cf3e6845 AC |
4991 | -- If the type of the first formal of the current subprogram is a non- |
4992 | -- generic tagged private type, mark the subprogram as being a private | |
4993 | -- primitive. Ditto if this is a function with controlling result, and | |
4994 | -- the return type is currently private. In both cases, the type of the | |
4995 | -- controlling argument or result must be in the current scope for the | |
4996 | -- operation to be primitive. | |
6ca063eb AC |
4997 | |
4998 | if Has_Controlling_Result (Designator) | |
4999 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 5000 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
5001 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
5002 | then | |
5003 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 5004 | |
6ca063eb | 5005 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
5006 | declare |
5007 | Formal_Typ : constant Entity_Id := | |
5008 | Etype (First_Formal (Designator)); | |
5009 | begin | |
5010 | Set_Is_Private_Primitive (Designator, | |
5011 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 5012 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
5013 | and then Is_Private_Type (Formal_Typ) |
5014 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
5015 | end; | |
5016 | end if; | |
5017 | ||
ec4867fa ES |
5018 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
5019 | -- or null. | |
5020 | ||
0791fbe9 | 5021 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
5022 | and then Comes_From_Source (N) |
5023 | and then Is_Dispatching_Operation (Designator) | |
5024 | then | |
5025 | declare | |
5026 | E : Entity_Id; | |
5027 | Etyp : Entity_Id; | |
5028 | ||
5029 | begin | |
5030 | if Has_Controlling_Result (Designator) then | |
5031 | Etyp := Etype (Designator); | |
5032 | ||
5033 | else | |
5034 | E := First_Entity (Designator); | |
5035 | while Present (E) | |
5036 | and then Is_Formal (E) | |
5037 | and then not Is_Controlling_Formal (E) | |
5038 | loop | |
5039 | Next_Entity (E); | |
5040 | end loop; | |
5041 | ||
5042 | Etyp := Etype (E); | |
5043 | end if; | |
5044 | ||
5045 | if Is_Access_Type (Etyp) then | |
5046 | Etyp := Directly_Designated_Type (Etyp); | |
5047 | end if; | |
5048 | ||
5049 | if Is_Interface (Etyp) | |
f937473f | 5050 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa | 5051 | and then not (Ekind (Designator) = E_Procedure |
8fde064e | 5052 | and then Null_Present (Specification (N))) |
ec4867fa ES |
5053 | then |
5054 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
5055 | |
5056 | -- Specialize error message based on procedures vs. functions, | |
5057 | -- since functions can't be null subprograms. | |
5058 | ||
5059 | if Ekind (Designator) = E_Procedure then | |
5060 | Error_Msg_N | |
5061 | ("interface procedure % must be abstract or null", N); | |
5062 | else | |
3f80a182 AC |
5063 | Error_Msg_N |
5064 | ("interface function % must be abstract", N); | |
033eaf85 | 5065 | end if; |
ec4867fa ES |
5066 | end if; |
5067 | end; | |
5068 | end if; | |
5069 | ||
fbf5a39b AC |
5070 | -- What is the following code for, it used to be |
5071 | ||
5072 | -- ??? Set_Suppress_Elaboration_Checks | |
5073 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
5074 | ||
5075 | -- The following seems equivalent, but a bit dubious | |
5076 | ||
5077 | if Elaboration_Checks_Suppressed (Designator) then | |
5078 | Set_Kill_Elaboration_Checks (Designator); | |
5079 | end if; | |
996ae0b0 | 5080 | |
996ae0b0 RK |
5081 | -- For a compilation unit, set body required. This flag will only be |
5082 | -- reset if a valid Import or Interface pragma is processed later on. | |
5083 | ||
5084 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
5085 | Set_Body_Required (Parent (N), True); | |
758c442c | 5086 | |
0791fbe9 | 5087 | if Ada_Version >= Ada_2005 |
758c442c GD |
5088 | and then Nkind (Specification (N)) = N_Procedure_Specification |
5089 | and then Null_Present (Specification (N)) | |
5090 | then | |
5091 | Error_Msg_N | |
5092 | ("null procedure cannot be declared at library level", N); | |
5093 | end if; | |
996ae0b0 RK |
5094 | end if; |
5095 | ||
fbf5a39b | 5096 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 5097 | Check_Eliminated (Designator); |
fbf5a39b | 5098 | |
b1b543d2 BD |
5099 | if Debug_Flag_C then |
5100 | Outdent; | |
5101 | Write_Str ("<== subprogram spec "); | |
5102 | Write_Name (Chars (Designator)); | |
5103 | Write_Str (" from "); | |
5104 | Write_Location (Sloc (N)); | |
5105 | Write_Eol; | |
5106 | end if; | |
0f1a6a0b | 5107 | |
80f0c69c HK |
5108 | -- Indicate that this is a protected operation, because it may be used |
5109 | -- in subsequent declarations within the protected type. | |
1a265e78 | 5110 | |
80f0c69c | 5111 | if Is_Protected_Type (Current_Scope) then |
1a265e78 AC |
5112 | Set_Convention (Designator, Convention_Protected); |
5113 | end if; | |
5114 | ||
beacce02 | 5115 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb | 5116 | |
80f0c69c HK |
5117 | -- Process the aspects before establishing the proper categorization in |
5118 | -- case the subprogram is a compilation unit and one of its aspects is | |
5119 | -- converted into a categorization pragma. | |
5120 | ||
eaba57fb RD |
5121 | if Has_Aspects (N) then |
5122 | Analyze_Aspect_Specifications (N, Designator); | |
5123 | end if; | |
80f0c69c HK |
5124 | |
5125 | if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then | |
5126 | Set_Categorization_From_Scope (Designator, Scop); | |
5127 | ||
5128 | -- Otherwise the unit is a compilation unit and/or a child unit. Set the | |
5129 | -- proper categorization of the unit based on its pragmas. | |
5130 | ||
5131 | else | |
5132 | Push_Scope (Designator); | |
5133 | Set_Categorization_From_Pragmas (N); | |
5134 | Validate_Categorization_Dependency (N, Designator); | |
5135 | Pop_Scope; | |
5136 | end if; | |
996ae0b0 RK |
5137 | end Analyze_Subprogram_Declaration; |
5138 | ||
fbf5a39b AC |
5139 | -------------------------------------- |
5140 | -- Analyze_Subprogram_Specification -- | |
5141 | -------------------------------------- | |
5142 | ||
5143 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
5144 | -- declaration). This procedure is called to analyze the specification in | |
5145 | -- both subprogram bodies and subprogram declarations (specs). | |
5146 | ||
5147 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
3ddfabe3 AC |
5148 | function Is_Invariant_Procedure_Or_Body (E : Entity_Id) return Boolean; |
5149 | -- Determine whether entity E denotes the spec or body of an invariant | |
5150 | -- procedure. | |
5151 | ||
5152 | ------------------------------------ | |
5153 | -- Is_Invariant_Procedure_Or_Body -- | |
5154 | ------------------------------------ | |
5155 | ||
5156 | function Is_Invariant_Procedure_Or_Body (E : Entity_Id) return Boolean is | |
5157 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
5158 | Spec : Entity_Id; | |
5159 | ||
5160 | begin | |
5161 | if Nkind (Decl) = N_Subprogram_Body then | |
5162 | Spec := Corresponding_Spec (Decl); | |
5163 | else | |
5164 | Spec := E; | |
5165 | end if; | |
5166 | ||
5167 | return | |
5168 | Present (Spec) | |
5169 | and then Ekind (Spec) = E_Procedure | |
5170 | and then (Is_Partial_Invariant_Procedure (Spec) | |
5171 | or else Is_Invariant_Procedure (Spec)); | |
5172 | end Is_Invariant_Procedure_Or_Body; | |
5173 | ||
5174 | -- Local variables | |
5175 | ||
fbf5a39b | 5176 | Designator : constant Entity_Id := Defining_Entity (N); |
21d27997 | 5177 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 5178 | |
758c442c GD |
5179 | -- Start of processing for Analyze_Subprogram_Specification |
5180 | ||
fbf5a39b | 5181 | begin |
2ba431e5 | 5182 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 5183 | |
db72f10a AC |
5184 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
5185 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
5186 | then | |
ce5ba43a AC |
5187 | Check_SPARK_05_Restriction |
5188 | ("user-defined operator is not allowed", N); | |
38171f43 AC |
5189 | end if; |
5190 | ||
31af8899 AC |
5191 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
5192 | -- specification comes from an expression function, because it may be | |
a3f9da70 | 5193 | -- the completion of a previous declaration. If it is not, the cross- |
31af8899 AC |
5194 | -- reference entry will be emitted for the new subprogram declaration. |
5195 | ||
5196 | if Nkind (Parent (N)) /= N_Expression_Function then | |
5197 | Generate_Definition (Designator); | |
5198 | end if; | |
38171f43 | 5199 | |
fbf5a39b AC |
5200 | if Nkind (N) = N_Function_Specification then |
5201 | Set_Ekind (Designator, E_Function); | |
5202 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
5203 | else |
5204 | Set_Ekind (Designator, E_Procedure); | |
5205 | Set_Etype (Designator, Standard_Void_Type); | |
5206 | end if; | |
5207 | ||
4bd4bb7f AC |
5208 | -- Flag Is_Inlined_Always is True by default, and reversed to False for |
5209 | -- those subprograms which could be inlined in GNATprove mode (because | |
319c6161 | 5210 | -- Body_To_Inline is non-Empty) but should not be inlined. |
4bd4bb7f AC |
5211 | |
5212 | if GNATprove_Mode then | |
5213 | Set_Is_Inlined_Always (Designator); | |
5214 | end if; | |
5215 | ||
800621e0 | 5216 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
5217 | |
5218 | Set_Scope (Designator, Current_Scope); | |
5219 | ||
fbf5a39b | 5220 | if Present (Formals) then |
0a36105d | 5221 | Push_Scope (Designator); |
fbf5a39b | 5222 | Process_Formals (Formals, N); |
758c442c | 5223 | |
0929eaeb AC |
5224 | -- Check dimensions in N for formals with default expression |
5225 | ||
5226 | Analyze_Dimension_Formals (N, Formals); | |
5227 | ||
a38ff9b1 ES |
5228 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
5229 | -- inherited interface operation, and the controlling type is | |
5230 | -- a synchronized type, replace the type with its corresponding | |
5231 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
5232 | -- Same processing for an access parameter whose designated type is |
5233 | -- derived from a synchronized interface. | |
758c442c | 5234 | |
3ddfabe3 AC |
5235 | -- This modification is not done for invariant procedures because |
5236 | -- the corresponding record may not necessarely be visible when the | |
5237 | -- concurrent type acts as the full view of a private type. | |
5238 | ||
5239 | -- package Pack is | |
5240 | -- type Prot is private with Type_Invariant => ...; | |
5241 | -- procedure ConcInvariant (Obj : Prot); | |
5242 | -- private | |
5243 | -- protected type Prot is ...; | |
5244 | -- type Concurrent_Record_Prot is record ...; | |
5245 | -- procedure ConcInvariant (Obj : Prot) is | |
5246 | -- ... | |
5247 | -- end ConcInvariant; | |
5248 | -- end Pack; | |
5249 | ||
5250 | -- In the example above, both the spec and body of the invariant | |
5251 | -- procedure must utilize the private type as the controlling type. | |
5252 | ||
5253 | if Ada_Version >= Ada_2005 | |
5254 | and then not Is_Invariant_Procedure_Or_Body (Designator) | |
5255 | then | |
d44202ba HK |
5256 | declare |
5257 | Formal : Entity_Id; | |
5258 | Formal_Typ : Entity_Id; | |
5259 | Rec_Typ : Entity_Id; | |
69cb258c | 5260 | Desig_Typ : Entity_Id; |
0a36105d | 5261 | |
d44202ba HK |
5262 | begin |
5263 | Formal := First_Formal (Designator); | |
5264 | while Present (Formal) loop | |
5265 | Formal_Typ := Etype (Formal); | |
0a36105d | 5266 | |
d44202ba HK |
5267 | if Is_Concurrent_Type (Formal_Typ) |
5268 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
5269 | then | |
5270 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
5271 | ||
5272 | if Present (Interfaces (Rec_Typ)) then | |
5273 | Set_Etype (Formal, Rec_Typ); | |
5274 | end if; | |
69cb258c AC |
5275 | |
5276 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
5277 | Desig_Typ := Designated_Type (Formal_Typ); | |
5278 | ||
5279 | if Is_Concurrent_Type (Desig_Typ) | |
5280 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
5281 | then | |
5282 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
5283 | ||
5284 | if Present (Interfaces (Rec_Typ)) then | |
5285 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
5286 | end if; | |
5287 | end if; | |
d44202ba HK |
5288 | end if; |
5289 | ||
5290 | Next_Formal (Formal); | |
5291 | end loop; | |
5292 | end; | |
758c442c GD |
5293 | end if; |
5294 | ||
fbf5a39b | 5295 | End_Scope; |
82c80734 | 5296 | |
b66c3ff4 AC |
5297 | -- The subprogram scope is pushed and popped around the processing of |
5298 | -- the return type for consistency with call above to Process_Formals | |
5299 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
5300 | -- itype created for the return type will be associated with the proper | |
5301 | -- scope. | |
5302 | ||
82c80734 | 5303 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 5304 | Push_Scope (Designator); |
82c80734 | 5305 | Analyze_Return_Type (N); |
b66c3ff4 | 5306 | End_Scope; |
fbf5a39b AC |
5307 | end if; |
5308 | ||
e606088a AC |
5309 | -- Function case |
5310 | ||
fbf5a39b | 5311 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
5312 | |
5313 | -- Deal with operator symbol case | |
5314 | ||
fbf5a39b AC |
5315 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
5316 | Valid_Operator_Definition (Designator); | |
5317 | end if; | |
5318 | ||
5319 | May_Need_Actuals (Designator); | |
5320 | ||
fe63b1b1 ES |
5321 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
5322 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
5323 | -- declarations, where abstractness is inherited, and to subprogram |
5324 | -- bodies generated for stream operations, which become renamings as | |
5325 | -- bodies. | |
2bfb1b72 | 5326 | |
fe63b1b1 ES |
5327 | -- In case of primitives associated with abstract interface types |
5328 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 5329 | |
1adaea16 | 5330 | if not Nkind_In (Original_Node (Parent (N)), |
3f80a182 | 5331 | N_Abstract_Subprogram_Declaration, |
847d950d HK |
5332 | N_Formal_Abstract_Subprogram_Declaration, |
5333 | N_Subprogram_Renaming_Declaration) | |
fbf5a39b | 5334 | then |
2e79de51 AC |
5335 | if Is_Abstract_Type (Etype (Designator)) |
5336 | and then not Is_Interface (Etype (Designator)) | |
5337 | then | |
5338 | Error_Msg_N | |
5339 | ("function that returns abstract type must be abstract", N); | |
5340 | ||
e606088a | 5341 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
5342 | -- access result whose designated type is abstract. |
5343 | ||
847d950d HK |
5344 | elsif Ada_Version >= Ada_2012 |
5345 | and then Nkind (Result_Definition (N)) = N_Access_Definition | |
2e79de51 AC |
5346 | and then |
5347 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
5348 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
2e79de51 | 5349 | then |
847d950d HK |
5350 | Error_Msg_N |
5351 | ("function whose access result designates abstract type " | |
5352 | & "must be abstract", N); | |
2e79de51 | 5353 | end if; |
fbf5a39b AC |
5354 | end if; |
5355 | end if; | |
5356 | ||
5357 | return Designator; | |
5358 | end Analyze_Subprogram_Specification; | |
5359 | ||
996ae0b0 RK |
5360 | ----------------------- |
5361 | -- Check_Conformance -- | |
5362 | ----------------------- | |
5363 | ||
5364 | procedure Check_Conformance | |
41251c60 JM |
5365 | (New_Id : Entity_Id; |
5366 | Old_Id : Entity_Id; | |
5367 | Ctype : Conformance_Type; | |
5368 | Errmsg : Boolean; | |
5369 | Conforms : out Boolean; | |
5370 | Err_Loc : Node_Id := Empty; | |
5371 | Get_Inst : Boolean := False; | |
5372 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 5373 | is |
996ae0b0 | 5374 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
5375 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
5376 | -- If Errmsg is True, then processing continues to post an error message | |
5377 | -- for conformance error on given node. Two messages are output. The | |
5378 | -- first message points to the previous declaration with a general "no | |
5379 | -- conformance" message. The second is the detailed reason, supplied as | |
5380 | -- Msg. The parameter N provide information for a possible & insertion | |
5381 | -- in the message, and also provides the location for posting the | |
5382 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 | 5383 | |
f991bd8e HK |
5384 | function Conventions_Match |
5385 | (Id1 : Entity_Id; | |
5386 | Id2 : Entity_Id) return Boolean; | |
5387 | -- Determine whether the conventions of arbitrary entities Id1 and Id2 | |
5388 | -- match. | |
5389 | ||
996ae0b0 RK |
5390 | ----------------------- |
5391 | -- Conformance_Error -- | |
5392 | ----------------------- | |
5393 | ||
5394 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
5395 | Enode : Node_Id; | |
5396 | ||
5397 | begin | |
5398 | Conforms := False; | |
5399 | ||
5400 | if Errmsg then | |
5401 | if No (Err_Loc) then | |
5402 | Enode := N; | |
5403 | else | |
5404 | Enode := Err_Loc; | |
5405 | end if; | |
5406 | ||
5407 | Error_Msg_Sloc := Sloc (Old_Id); | |
5408 | ||
5409 | case Ctype is | |
5410 | when Type_Conformant => | |
483c78cb | 5411 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
5412 | ("not type conformant with declaration#!", Enode); |
5413 | ||
5414 | when Mode_Conformant => | |
19590d70 | 5415 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5416 | Error_Msg_N |
19590d70 GD |
5417 | ("not mode conformant with operation inherited#!", |
5418 | Enode); | |
5419 | else | |
ed2233dc | 5420 | Error_Msg_N |
19590d70 GD |
5421 | ("not mode conformant with declaration#!", Enode); |
5422 | end if; | |
996ae0b0 RK |
5423 | |
5424 | when Subtype_Conformant => | |
19590d70 | 5425 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5426 | Error_Msg_N |
19590d70 GD |
5427 | ("not subtype conformant with operation inherited#!", |
5428 | Enode); | |
5429 | else | |
ed2233dc | 5430 | Error_Msg_N |
19590d70 GD |
5431 | ("not subtype conformant with declaration#!", Enode); |
5432 | end if; | |
996ae0b0 RK |
5433 | |
5434 | when Fully_Conformant => | |
19590d70 | 5435 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 5436 | Error_Msg_N -- CODEFIX |
19590d70 GD |
5437 | ("not fully conformant with operation inherited#!", |
5438 | Enode); | |
5439 | else | |
483c78cb | 5440 | Error_Msg_N -- CODEFIX |
19590d70 GD |
5441 | ("not fully conformant with declaration#!", Enode); |
5442 | end if; | |
996ae0b0 RK |
5443 | end case; |
5444 | ||
5445 | Error_Msg_NE (Msg, Enode, N); | |
5446 | end if; | |
5447 | end Conformance_Error; | |
5448 | ||
f991bd8e HK |
5449 | ----------------------- |
5450 | -- Conventions_Match -- | |
5451 | ----------------------- | |
5452 | ||
5453 | function Conventions_Match | |
5454 | (Id1 : Entity_Id; | |
5455 | Id2 : Entity_Id) return Boolean | |
5456 | is | |
5457 | begin | |
5458 | -- Ignore the conventions of anonymous access-to-subprogram types | |
5459 | -- and subprogram types because these are internally generated and | |
5460 | -- the only way these may receive a convention is if they inherit | |
5461 | -- the convention of a related subprogram. | |
5462 | ||
5463 | if Ekind_In (Id1, E_Anonymous_Access_Subprogram_Type, | |
5464 | E_Subprogram_Type) | |
5465 | or else | |
5466 | Ekind_In (Id2, E_Anonymous_Access_Subprogram_Type, | |
5467 | E_Subprogram_Type) | |
5468 | then | |
5469 | return True; | |
5470 | ||
5471 | -- Otherwise compare the conventions directly | |
5472 | ||
5473 | else | |
5474 | return Convention (Id1) = Convention (Id2); | |
5475 | end if; | |
5476 | end Conventions_Match; | |
5477 | ||
ec4867fa ES |
5478 | -- Local Variables |
5479 | ||
5480 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
5481 | New_Type : constant Entity_Id := Etype (New_Id); | |
5482 | Old_Formal : Entity_Id; | |
5483 | New_Formal : Entity_Id; | |
5484 | Access_Types_Match : Boolean; | |
5485 | Old_Formal_Base : Entity_Id; | |
5486 | New_Formal_Base : Entity_Id; | |
5487 | ||
996ae0b0 RK |
5488 | -- Start of processing for Check_Conformance |
5489 | ||
5490 | begin | |
5491 | Conforms := True; | |
5492 | ||
82c80734 RD |
5493 | -- We need a special case for operators, since they don't appear |
5494 | -- explicitly. | |
996ae0b0 RK |
5495 | |
5496 | if Ctype = Type_Conformant then | |
5497 | if Ekind (New_Id) = E_Operator | |
5498 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
5499 | then | |
5500 | return; | |
5501 | end if; | |
5502 | end if; | |
5503 | ||
5504 | -- If both are functions/operators, check return types conform | |
5505 | ||
5506 | if Old_Type /= Standard_Void_Type | |
3cb9a885 AC |
5507 | and then |
5508 | New_Type /= Standard_Void_Type | |
996ae0b0 | 5509 | then |
fceeaab6 ES |
5510 | -- If we are checking interface conformance we omit controlling |
5511 | -- arguments and result, because we are only checking the conformance | |
5512 | -- of the remaining parameters. | |
5513 | ||
5514 | if Has_Controlling_Result (Old_Id) | |
5515 | and then Has_Controlling_Result (New_Id) | |
5516 | and then Skip_Controlling_Formals | |
5517 | then | |
5518 | null; | |
5519 | ||
5520 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
7f568bfa AC |
5521 | if Ctype >= Subtype_Conformant |
5522 | and then not Predicates_Match (Old_Type, New_Type) | |
5523 | then | |
5524 | Conformance_Error | |
5525 | ("\predicate of return type does not match!", New_Id); | |
5526 | else | |
5527 | Conformance_Error | |
5528 | ("\return type does not match!", New_Id); | |
5529 | end if; | |
5530 | ||
996ae0b0 RK |
5531 | return; |
5532 | end if; | |
5533 | ||
41251c60 | 5534 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 5535 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 5536 | |
0791fbe9 | 5537 | if Ada_Version >= Ada_2005 |
41251c60 JM |
5538 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
5539 | and then | |
8fde064e AC |
5540 | (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
5541 | or else Is_Access_Constant (Etype (Old_Type)) /= | |
5542 | Is_Access_Constant (Etype (New_Type))) | |
41251c60 | 5543 | then |
5d37ba92 | 5544 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
5545 | return; |
5546 | end if; | |
5547 | ||
996ae0b0 RK |
5548 | -- If either is a function/operator and the other isn't, error |
5549 | ||
5550 | elsif Old_Type /= Standard_Void_Type | |
5551 | or else New_Type /= Standard_Void_Type | |
5552 | then | |
5d37ba92 | 5553 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
5554 | return; |
5555 | end if; | |
5556 | ||
0a36105d | 5557 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
5558 | -- If this is a renaming as body, refine error message to indicate that |
5559 | -- the conflict is with the original declaration. If the entity is not | |
5560 | -- frozen, the conventions don't have to match, the one of the renamed | |
5561 | -- entity is inherited. | |
5562 | ||
5563 | if Ctype >= Subtype_Conformant then | |
f991bd8e | 5564 | if not Conventions_Match (Old_Id, New_Id) then |
996ae0b0 RK |
5565 | if not Is_Frozen (New_Id) then |
5566 | null; | |
5567 | ||
5568 | elsif Present (Err_Loc) | |
5569 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
5570 | and then Present (Corresponding_Spec (Err_Loc)) | |
5571 | then | |
5572 | Error_Msg_Name_1 := Chars (New_Id); | |
5573 | Error_Msg_Name_2 := | |
5574 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 5575 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
5576 | |
5577 | else | |
5d37ba92 | 5578 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
5579 | end if; |
5580 | ||
5581 | return; | |
5582 | ||
5583 | elsif Is_Formal_Subprogram (Old_Id) | |
5584 | or else Is_Formal_Subprogram (New_Id) | |
90fa8613 | 5585 | or else (Is_Subprogram (New_Id) |
3d581777 HK |
5586 | and then Present (Alias (New_Id)) |
5587 | and then Is_Formal_Subprogram (Alias (New_Id))) | |
996ae0b0 | 5588 | then |
90fa8613 | 5589 | Conformance_Error |
3d581777 HK |
5590 | ("\formal subprograms are not subtype conformant " |
5591 | & "(RM 6.3.1 (17/3))"); | |
996ae0b0 RK |
5592 | end if; |
5593 | end if; | |
5594 | ||
5595 | -- Deal with parameters | |
5596 | ||
5597 | -- Note: we use the entity information, rather than going directly | |
5598 | -- to the specification in the tree. This is not only simpler, but | |
5599 | -- absolutely necessary for some cases of conformance tests between | |
a90bd866 | 5600 | -- operators, where the declaration tree simply does not exist. |
996ae0b0 RK |
5601 | |
5602 | Old_Formal := First_Formal (Old_Id); | |
5603 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 5604 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
5605 | if Is_Controlling_Formal (Old_Formal) |
5606 | and then Is_Controlling_Formal (New_Formal) | |
5607 | and then Skip_Controlling_Formals | |
5608 | then | |
a2dc5812 AC |
5609 | -- The controlling formals will have different types when |
5610 | -- comparing an interface operation with its match, but both | |
5611 | -- or neither must be access parameters. | |
5612 | ||
5613 | if Is_Access_Type (Etype (Old_Formal)) | |
5614 | = | |
5615 | Is_Access_Type (Etype (New_Formal)) | |
5616 | then | |
5617 | goto Skip_Controlling_Formal; | |
5618 | else | |
5619 | Conformance_Error | |
5620 | ("\access parameter does not match!", New_Formal); | |
5621 | end if; | |
41251c60 JM |
5622 | end if; |
5623 | ||
21791d97 | 5624 | -- Ada 2012: Mode conformance also requires that formal parameters |
2a290fec AC |
5625 | -- be both aliased, or neither. |
5626 | ||
21791d97 | 5627 | if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
2a290fec AC |
5628 | if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
5629 | Conformance_Error | |
5630 | ("\aliased parameter mismatch!", New_Formal); | |
5631 | end if; | |
5632 | end if; | |
5633 | ||
fbf5a39b AC |
5634 | if Ctype = Fully_Conformant then |
5635 | ||
5636 | -- Names must match. Error message is more accurate if we do | |
5637 | -- this before checking that the types of the formals match. | |
5638 | ||
5639 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
3ccedacc | 5640 | Conformance_Error ("\name& does not match!", New_Formal); |
fbf5a39b AC |
5641 | |
5642 | -- Set error posted flag on new formal as well to stop | |
5643 | -- junk cascaded messages in some cases. | |
5644 | ||
5645 | Set_Error_Posted (New_Formal); | |
5646 | return; | |
5647 | end if; | |
40b93859 RD |
5648 | |
5649 | -- Null exclusion must match | |
5650 | ||
5651 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
5652 | /= | |
5653 | Null_Exclusion_Present (Parent (New_Formal)) | |
5654 | then | |
5655 | -- Only give error if both come from source. This should be | |
5656 | -- investigated some time, since it should not be needed ??? | |
5657 | ||
5658 | if Comes_From_Source (Old_Formal) | |
5659 | and then | |
5660 | Comes_From_Source (New_Formal) | |
5661 | then | |
5662 | Conformance_Error | |
3ccedacc | 5663 | ("\null exclusion for& does not match", New_Formal); |
40b93859 RD |
5664 | |
5665 | -- Mark error posted on the new formal to avoid duplicated | |
5666 | -- complaint about types not matching. | |
5667 | ||
5668 | Set_Error_Posted (New_Formal); | |
5669 | end if; | |
5670 | end if; | |
fbf5a39b | 5671 | end if; |
996ae0b0 | 5672 | |
ec4867fa ES |
5673 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
5674 | -- case occurs whenever a subprogram is being renamed and one of its | |
5675 | -- parameters imposes a null exclusion. For example: | |
5676 | ||
5677 | -- type T is null record; | |
5678 | -- type Acc_T is access T; | |
5679 | -- subtype Acc_T_Sub is Acc_T; | |
5680 | ||
5681 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
5682 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
5683 | -- renames P; | |
5684 | ||
5685 | Old_Formal_Base := Etype (Old_Formal); | |
5686 | New_Formal_Base := Etype (New_Formal); | |
5687 | ||
5688 | if Get_Inst then | |
5689 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
5690 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
5691 | end if; | |
5692 | ||
0791fbe9 | 5693 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa | 5694 | |
8fde064e AC |
5695 | -- Ensure that this rule is only applied when New_Id is a |
5696 | -- renaming of Old_Id. | |
ec4867fa | 5697 | |
5d37ba92 ES |
5698 | and then Nkind (Parent (Parent (New_Id))) = |
5699 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
5700 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
5701 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
5702 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
5703 | ||
8fde064e | 5704 | -- Now handle the allowed access-type case |
ec4867fa ES |
5705 | |
5706 | and then Is_Access_Type (Old_Formal_Base) | |
5707 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 | 5708 | |
8fde064e AC |
5709 | -- The type kinds must match. The only exception occurs with |
5710 | -- multiple generics of the form: | |
5d37ba92 | 5711 | |
8fde064e AC |
5712 | -- generic generic |
5713 | -- type F is private; type A is private; | |
5714 | -- type F_Ptr is access F; type A_Ptr is access A; | |
5715 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
5716 | -- package F_Pack is ... package A_Pack is | |
5717 | -- package F_Inst is | |
5718 | -- new F_Pack (A, A_Ptr, A_P); | |
5d37ba92 | 5719 | |
8fde064e AC |
5720 | -- When checking for conformance between the parameters of A_P |
5721 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
5722 | -- because the compiler has transformed A_Ptr into a subtype of | |
5723 | -- F_Ptr. We catch this case in the code below. | |
5d37ba92 ES |
5724 | |
5725 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4b6f99f5 RD |
5726 | or else |
5727 | (Is_Generic_Type (Old_Formal_Base) | |
5728 | and then Is_Generic_Type (New_Formal_Base) | |
5729 | and then Is_Internal (New_Formal_Base) | |
5730 | and then Etype (Etype (New_Formal_Base)) = | |
5731 | Old_Formal_Base)) | |
5732 | and then Directly_Designated_Type (Old_Formal_Base) = | |
5733 | Directly_Designated_Type (New_Formal_Base) | |
ec4867fa | 5734 | and then ((Is_Itype (Old_Formal_Base) |
44f83ca4 JS |
5735 | and then (Can_Never_Be_Null (Old_Formal_Base) |
5736 | or else Is_Access_Constant | |
5737 | (Old_Formal_Base))) | |
4b6f99f5 RD |
5738 | or else |
5739 | (Is_Itype (New_Formal_Base) | |
44f83ca4 JS |
5740 | and then (Can_Never_Be_Null (New_Formal_Base) |
5741 | or else Is_Access_Constant | |
5742 | (New_Formal_Base)))); | |
ec4867fa | 5743 | |
996ae0b0 RK |
5744 | -- Types must always match. In the visible part of an instance, |
5745 | -- usual overloading rules for dispatching operations apply, and | |
5746 | -- we check base types (not the actual subtypes). | |
5747 | ||
5748 | if In_Instance_Visible_Part | |
5749 | and then Is_Dispatching_Operation (New_Id) | |
5750 | then | |
5751 | if not Conforming_Types | |
ec4867fa ES |
5752 | (T1 => Base_Type (Etype (Old_Formal)), |
5753 | T2 => Base_Type (Etype (New_Formal)), | |
5754 | Ctype => Ctype, | |
5755 | Get_Inst => Get_Inst) | |
5756 | and then not Access_Types_Match | |
996ae0b0 | 5757 | then |
5d37ba92 | 5758 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
5759 | return; |
5760 | end if; | |
5761 | ||
5762 | elsif not Conforming_Types | |
5d37ba92 ES |
5763 | (T1 => Old_Formal_Base, |
5764 | T2 => New_Formal_Base, | |
ec4867fa ES |
5765 | Ctype => Ctype, |
5766 | Get_Inst => Get_Inst) | |
5767 | and then not Access_Types_Match | |
996ae0b0 | 5768 | then |
c27f2f15 RD |
5769 | -- Don't give error message if old type is Any_Type. This test |
5770 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
5771 | ||
5772 | if Errmsg and then Old_Formal_Base = Any_Type then | |
5773 | Conforms := False; | |
5774 | else | |
7f568bfa AC |
5775 | if Ctype >= Subtype_Conformant |
5776 | and then | |
5777 | not Predicates_Match (Old_Formal_Base, New_Formal_Base) | |
5778 | then | |
5779 | Conformance_Error | |
5780 | ("\predicate of & does not match!", New_Formal); | |
5781 | else | |
5782 | Conformance_Error | |
5783 | ("\type of & does not match!", New_Formal); | |
7738270b AC |
5784 | |
5785 | if not Dimensions_Match (Old_Formal_Base, New_Formal_Base) | |
5786 | then | |
5787 | Error_Msg_N ("\dimensions mismatch!", New_Formal); | |
5788 | end if; | |
7f568bfa | 5789 | end if; |
c27f2f15 RD |
5790 | end if; |
5791 | ||
996ae0b0 RK |
5792 | return; |
5793 | end if; | |
5794 | ||
5795 | -- For mode conformance, mode must match | |
5796 | ||
5d37ba92 ES |
5797 | if Ctype >= Mode_Conformant then |
5798 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
5799 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
5800 | or else not Is_Primitive_Wrapper (New_Id) | |
5801 | then | |
5802 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 5803 | |
dd54644b JM |
5804 | else |
5805 | declare | |
a2667f14 | 5806 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b | 5807 | begin |
3ccedacc | 5808 | if Is_Protected_Type (Corresponding_Concurrent_Type (T)) |
dd54644b | 5809 | then |
2c6336be | 5810 | Error_Msg_PT (New_Id, Ultimate_Alias (Old_Id)); |
dd54644b JM |
5811 | else |
5812 | Conformance_Error | |
5813 | ("\mode of & does not match!", New_Formal); | |
5814 | end if; | |
5815 | end; | |
5816 | end if; | |
5817 | ||
5d37ba92 ES |
5818 | return; |
5819 | ||
5820 | -- Part of mode conformance for access types is having the same | |
5821 | -- constant modifier. | |
5822 | ||
5823 | elsif Access_Types_Match | |
5824 | and then Is_Access_Constant (Old_Formal_Base) /= | |
5825 | Is_Access_Constant (New_Formal_Base) | |
5826 | then | |
5827 | Conformance_Error | |
5828 | ("\constant modifier does not match!", New_Formal); | |
5829 | return; | |
5830 | end if; | |
996ae0b0 RK |
5831 | end if; |
5832 | ||
0a36105d | 5833 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 5834 | |
0a36105d JM |
5835 | -- Ada 2005 (AI-231): In case of anonymous access types check |
5836 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
5837 | -- match. For null exclusion, we test the types rather than the |
5838 | -- formals themselves, since the attribute is only set reliably | |
5839 | -- on the formals in the Ada 95 case, and we exclude the case | |
5840 | -- where Old_Formal is marked as controlling, to avoid errors | |
5841 | -- when matching completing bodies with dispatching declarations | |
5842 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 5843 | |
0791fbe9 | 5844 | if Ada_Version >= Ada_2005 |
0a36105d JM |
5845 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
5846 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
5847 | and then | |
c7b9d548 AC |
5848 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
5849 | Can_Never_Be_Null (Etype (New_Formal)) | |
5850 | and then | |
5851 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
5852 | or else |
5853 | Is_Access_Constant (Etype (Old_Formal)) /= | |
5854 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
5855 | |
5856 | -- Do not complain if error already posted on New_Formal. This | |
5857 | -- avoids some redundant error messages. | |
5858 | ||
5859 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
5860 | then |
5861 | -- It is allowed to omit the null-exclusion in case of stream | |
5862 | -- attribute subprograms. We recognize stream subprograms | |
5863 | -- through their TSS-generated suffix. | |
996ae0b0 | 5864 | |
0a36105d JM |
5865 | declare |
5866 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
3ada950b | 5867 | |
0a36105d JM |
5868 | begin |
5869 | if TSS_Name /= TSS_Stream_Read | |
5870 | and then TSS_Name /= TSS_Stream_Write | |
5871 | and then TSS_Name /= TSS_Stream_Input | |
5872 | and then TSS_Name /= TSS_Stream_Output | |
5873 | then | |
3ada950b | 5874 | -- Here we have a definite conformance error. It is worth |
71fb4dc8 | 5875 | -- special casing the error message for the case of a |
3ada950b AC |
5876 | -- controlling formal (which excludes null). |
5877 | ||
5878 | if Is_Controlling_Formal (New_Formal) then | |
5879 | Error_Msg_Node_2 := Scope (New_Formal); | |
5880 | Conformance_Error | |
3ccedacc AC |
5881 | ("\controlling formal & of & excludes null, " |
5882 | & "declaration must exclude null as well", | |
5883 | New_Formal); | |
3ada950b AC |
5884 | |
5885 | -- Normal case (couldn't we give more detail here???) | |
5886 | ||
5887 | else | |
5888 | Conformance_Error | |
5889 | ("\type of & does not match!", New_Formal); | |
5890 | end if; | |
5891 | ||
0a36105d JM |
5892 | return; |
5893 | end if; | |
5894 | end; | |
5895 | end if; | |
5896 | end if; | |
41251c60 | 5897 | |
0a36105d | 5898 | -- Full conformance checks |
41251c60 | 5899 | |
0a36105d | 5900 | if Ctype = Fully_Conformant then |
e660dbf7 | 5901 | |
0a36105d | 5902 | -- We have checked already that names match |
e660dbf7 | 5903 | |
0a36105d | 5904 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
5905 | |
5906 | -- Check default expressions for in parameters | |
5907 | ||
996ae0b0 RK |
5908 | declare |
5909 | NewD : constant Boolean := | |
5910 | Present (Default_Value (New_Formal)); | |
5911 | OldD : constant Boolean := | |
5912 | Present (Default_Value (Old_Formal)); | |
5913 | begin | |
5914 | if NewD or OldD then | |
5915 | ||
82c80734 RD |
5916 | -- The old default value has been analyzed because the |
5917 | -- current full declaration will have frozen everything | |
0a36105d JM |
5918 | -- before. The new default value has not been analyzed, |
5919 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
5920 | |
5921 | if NewD then | |
0a36105d | 5922 | Push_Scope (New_Id); |
21d27997 | 5923 | Preanalyze_Spec_Expression |
fbf5a39b | 5924 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
5925 | End_Scope; |
5926 | end if; | |
5927 | ||
5928 | if not (NewD and OldD) | |
5929 | or else not Fully_Conformant_Expressions | |
5930 | (Default_Value (Old_Formal), | |
5931 | Default_Value (New_Formal)) | |
5932 | then | |
5933 | Conformance_Error | |
5d37ba92 | 5934 | ("\default expression for & does not match!", |
996ae0b0 RK |
5935 | New_Formal); |
5936 | return; | |
5937 | end if; | |
5938 | end if; | |
5939 | end; | |
5940 | end if; | |
5941 | end if; | |
5942 | ||
5943 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 5944 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
5945 | -- or if either old or new instance is not from the source program. |
5946 | ||
0ab80019 | 5947 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5948 | and then Sloc (Old_Id) > Standard_Location |
5949 | and then Sloc (New_Id) > Standard_Location | |
5950 | and then Comes_From_Source (Old_Id) | |
5951 | and then Comes_From_Source (New_Id) | |
5952 | then | |
5953 | declare | |
5954 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
5955 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
5956 | ||
5957 | begin | |
5958 | -- Explicit IN must be present or absent in both cases. This | |
5959 | -- test is required only in the full conformance case. | |
5960 | ||
5961 | if In_Present (Old_Param) /= In_Present (New_Param) | |
5962 | and then Ctype = Fully_Conformant | |
5963 | then | |
5964 | Conformance_Error | |
5d37ba92 | 5965 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
5966 | New_Formal); |
5967 | return; | |
5968 | end if; | |
5969 | ||
5970 | -- Grouping (use of comma in param lists) must be the same | |
5971 | -- This is where we catch a misconformance like: | |
5972 | ||
0a36105d | 5973 | -- A, B : Integer |
996ae0b0 RK |
5974 | -- A : Integer; B : Integer |
5975 | ||
5976 | -- which are represented identically in the tree except | |
5977 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5978 | ||
5979 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
5980 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
5981 | then | |
5982 | Conformance_Error | |
5d37ba92 | 5983 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
5984 | return; |
5985 | end if; | |
5986 | end; | |
5987 | end if; | |
5988 | ||
41251c60 JM |
5989 | -- This label is required when skipping controlling formals |
5990 | ||
5991 | <<Skip_Controlling_Formal>> | |
5992 | ||
996ae0b0 RK |
5993 | Next_Formal (Old_Formal); |
5994 | Next_Formal (New_Formal); | |
5995 | end loop; | |
5996 | ||
5997 | if Present (Old_Formal) then | |
5d37ba92 | 5998 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
5999 | return; |
6000 | ||
6001 | elsif Present (New_Formal) then | |
5d37ba92 | 6002 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
6003 | return; |
6004 | end if; | |
996ae0b0 RK |
6005 | end Check_Conformance; |
6006 | ||
ec4867fa ES |
6007 | ----------------------- |
6008 | -- Check_Conventions -- | |
6009 | ----------------------- | |
6010 | ||
6011 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 6012 | Ifaces_List : Elist_Id; |
0a36105d | 6013 | |
ce2b6ba5 | 6014 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
6015 | -- Verify that the convention of inherited dispatching operation Op is |
6016 | -- consistent among all subprograms it overrides. In order to minimize | |
6017 | -- the search, Search_From is utilized to designate a specific point in | |
6018 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
6019 | |
6020 | ---------------------- | |
6021 | -- Check_Convention -- | |
6022 | ---------------------- | |
6023 | ||
ce2b6ba5 | 6024 | procedure Check_Convention (Op : Entity_Id) is |
c5cec2fe | 6025 | Op_Conv : constant Convention_Id := Convention (Op); |
9f6aaa5c | 6026 | Iface_Conv : Convention_Id; |
ce2b6ba5 JM |
6027 | Iface_Elmt : Elmt_Id; |
6028 | Iface_Prim_Elmt : Elmt_Id; | |
6029 | Iface_Prim : Entity_Id; | |
ec4867fa | 6030 | |
ce2b6ba5 JM |
6031 | begin |
6032 | Iface_Elmt := First_Elmt (Ifaces_List); | |
6033 | while Present (Iface_Elmt) loop | |
6034 | Iface_Prim_Elmt := | |
9f6aaa5c | 6035 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
ce2b6ba5 JM |
6036 | while Present (Iface_Prim_Elmt) loop |
6037 | Iface_Prim := Node (Iface_Prim_Elmt); | |
c5cec2fe | 6038 | Iface_Conv := Convention (Iface_Prim); |
ce2b6ba5 JM |
6039 | |
6040 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
9f6aaa5c | 6041 | and then Iface_Conv /= Op_Conv |
ce2b6ba5 | 6042 | then |
ed2233dc | 6043 | Error_Msg_N |
ce2b6ba5 | 6044 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 6045 | |
ce2b6ba5 | 6046 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c | 6047 | Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
ce2b6ba5 | 6048 | Error_Msg_Sloc := Sloc (Op); |
ec4867fa | 6049 | |
7a963087 | 6050 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 6051 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 6052 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 6053 | else |
ed2233dc | 6054 | Error_Msg_N |
3ccedacc AC |
6055 | ("\\overriding operation % with " |
6056 | & "convention % defined #", Typ); | |
ce2b6ba5 | 6057 | end if; |
ec4867fa | 6058 | |
ce2b6ba5 JM |
6059 | else pragma Assert (Present (Alias (Op))); |
6060 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
3ccedacc AC |
6061 | Error_Msg_N ("\\inherited operation % with " |
6062 | & "convention % defined #", Typ); | |
ce2b6ba5 | 6063 | end if; |
ec4867fa | 6064 | |
ce2b6ba5 | 6065 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c AC |
6066 | Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
6067 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
3ccedacc AC |
6068 | Error_Msg_N ("\\overridden operation % with " |
6069 | & "convention % defined #", Typ); | |
ec4867fa | 6070 | |
ce2b6ba5 | 6071 | -- Avoid cascading errors |
ec4867fa | 6072 | |
ce2b6ba5 JM |
6073 | return; |
6074 | end if; | |
ec4867fa | 6075 | |
ce2b6ba5 JM |
6076 | Next_Elmt (Iface_Prim_Elmt); |
6077 | end loop; | |
ec4867fa | 6078 | |
ce2b6ba5 | 6079 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
6080 | end loop; |
6081 | end Check_Convention; | |
6082 | ||
6083 | -- Local variables | |
6084 | ||
6085 | Prim_Op : Entity_Id; | |
6086 | Prim_Op_Elmt : Elmt_Id; | |
6087 | ||
6088 | -- Start of processing for Check_Conventions | |
6089 | ||
6090 | begin | |
ce2b6ba5 JM |
6091 | if not Has_Interfaces (Typ) then |
6092 | return; | |
6093 | end if; | |
6094 | ||
6095 | Collect_Interfaces (Typ, Ifaces_List); | |
6096 | ||
0a36105d JM |
6097 | -- The algorithm checks every overriding dispatching operation against |
6098 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 6099 | -- differences in conventions. |
ec4867fa ES |
6100 | |
6101 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
6102 | while Present (Prim_Op_Elmt) loop | |
6103 | Prim_Op := Node (Prim_Op_Elmt); | |
6104 | ||
0a36105d | 6105 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 6106 | -- since they always have the same convention. |
ec4867fa | 6107 | |
ce2b6ba5 JM |
6108 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
6109 | Check_Convention (Prim_Op); | |
ec4867fa ES |
6110 | end if; |
6111 | ||
6112 | Next_Elmt (Prim_Op_Elmt); | |
6113 | end loop; | |
6114 | end Check_Conventions; | |
6115 | ||
996ae0b0 RK |
6116 | ------------------------------ |
6117 | -- Check_Delayed_Subprogram -- | |
6118 | ------------------------------ | |
6119 | ||
6120 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
996ae0b0 | 6121 | procedure Possible_Freeze (T : Entity_Id); |
fc47ef60 PMR |
6122 | -- T is the type of either a formal parameter or of the return type. If |
6123 | -- T is not yet frozen and needs a delayed freeze, then the subprogram | |
6124 | -- itself must be delayed. | |
996ae0b0 | 6125 | |
82c80734 RD |
6126 | --------------------- |
6127 | -- Possible_Freeze -- | |
6128 | --------------------- | |
6129 | ||
996ae0b0 | 6130 | procedure Possible_Freeze (T : Entity_Id) is |
c581c520 | 6131 | Scop : constant Entity_Id := Scope (Designator); |
fc47ef60 | 6132 | |
996ae0b0 | 6133 | begin |
fc47ef60 PMR |
6134 | -- If the subprogram appears within a package instance (which may be |
6135 | -- the wrapper package of a subprogram instance) the freeze node for | |
6136 | -- that package will freeze the subprogram at the proper place, so | |
6137 | -- do not emit a freeze node for the subprogram, given that it may | |
6138 | -- appear in the wrong scope. | |
c581c520 PMR |
6139 | |
6140 | if Ekind (Scop) = E_Package | |
6141 | and then not Comes_From_Source (Scop) | |
6142 | and then Is_Generic_Instance (Scop) | |
6143 | then | |
6144 | null; | |
6145 | ||
6146 | elsif Has_Delayed_Freeze (T) and then not Is_Frozen (T) then | |
996ae0b0 RK |
6147 | Set_Has_Delayed_Freeze (Designator); |
6148 | ||
6149 | elsif Is_Access_Type (T) | |
6150 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
6151 | and then not Is_Frozen (Designated_Type (T)) | |
6152 | then | |
6153 | Set_Has_Delayed_Freeze (Designator); | |
6154 | end if; | |
6155 | end Possible_Freeze; | |
6156 | ||
fc47ef60 PMR |
6157 | -- Local variables |
6158 | ||
6159 | F : Entity_Id; | |
6160 | ||
996ae0b0 RK |
6161 | -- Start of processing for Check_Delayed_Subprogram |
6162 | ||
6163 | begin | |
76e3504f AC |
6164 | -- All subprograms, including abstract subprograms, may need a freeze |
6165 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 6166 | |
76e3504f AC |
6167 | Possible_Freeze (Etype (Designator)); |
6168 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 6169 | |
fc47ef60 PMR |
6170 | -- Need delayed freeze if any of the formal types themselves need a |
6171 | -- delayed freeze and are not yet frozen. | |
996ae0b0 | 6172 | |
76e3504f AC |
6173 | F := First_Formal (Designator); |
6174 | while Present (F) loop | |
6175 | Possible_Freeze (Etype (F)); | |
6176 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
6177 | Next_Formal (F); | |
6178 | end loop; | |
996ae0b0 | 6179 | |
fc47ef60 PMR |
6180 | -- Mark functions that return by reference. Note that it cannot be done |
6181 | -- for delayed_freeze subprograms because the underlying returned type | |
6182 | -- may not be known yet (for private types). | |
996ae0b0 | 6183 | |
8fde064e | 6184 | if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
996ae0b0 RK |
6185 | declare |
6186 | Typ : constant Entity_Id := Etype (Designator); | |
6187 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
fc47ef60 | 6188 | |
996ae0b0 | 6189 | begin |
51245e2d | 6190 | if Is_Limited_View (Typ) then |
996ae0b0 | 6191 | Set_Returns_By_Ref (Designator); |
fc47ef60 | 6192 | |
048e5cef | 6193 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
6194 | Set_Returns_By_Ref (Designator); |
6195 | end if; | |
6196 | end; | |
6197 | end if; | |
6198 | end Check_Delayed_Subprogram; | |
6199 | ||
6200 | ------------------------------------ | |
6201 | -- Check_Discriminant_Conformance -- | |
6202 | ------------------------------------ | |
6203 | ||
6204 | procedure Check_Discriminant_Conformance | |
6205 | (N : Node_Id; | |
6206 | Prev : Entity_Id; | |
6207 | Prev_Loc : Node_Id) | |
6208 | is | |
6209 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
6210 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
6211 | New_Discr_Id : Entity_Id; | |
6212 | New_Discr_Type : Entity_Id; | |
6213 | ||
6214 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
6215 | -- Post error message for conformance error on given node. Two messages |
6216 | -- are output. The first points to the previous declaration with a | |
6217 | -- general "no conformance" message. The second is the detailed reason, | |
6218 | -- supplied as Msg. The parameter N provide information for a possible | |
6219 | -- & insertion in the message. | |
996ae0b0 RK |
6220 | |
6221 | ----------------------- | |
6222 | -- Conformance_Error -- | |
6223 | ----------------------- | |
6224 | ||
6225 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
6226 | begin | |
6227 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
6228 | Error_Msg_N -- CODEFIX |
6229 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
6230 | Error_Msg_NE (Msg, N, N); |
6231 | end Conformance_Error; | |
6232 | ||
6233 | -- Start of processing for Check_Discriminant_Conformance | |
6234 | ||
6235 | begin | |
6236 | while Present (Old_Discr) and then Present (New_Discr) loop | |
996ae0b0 RK |
6237 | New_Discr_Id := Defining_Identifier (New_Discr); |
6238 | ||
82c80734 RD |
6239 | -- The subtype mark of the discriminant on the full type has not |
6240 | -- been analyzed so we do it here. For an access discriminant a new | |
6241 | -- type is created. | |
996ae0b0 RK |
6242 | |
6243 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
6244 | New_Discr_Type := | |
6245 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
6246 | ||
6247 | else | |
d036b2b8 | 6248 | Find_Type (Discriminant_Type (New_Discr)); |
996ae0b0 | 6249 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); |
e50e1c5e AC |
6250 | |
6251 | -- Ada 2005: if the discriminant definition carries a null | |
6252 | -- exclusion, create an itype to check properly for consistency | |
6253 | -- with partial declaration. | |
6254 | ||
6255 | if Is_Access_Type (New_Discr_Type) | |
8fde064e | 6256 | and then Null_Exclusion_Present (New_Discr) |
e50e1c5e AC |
6257 | then |
6258 | New_Discr_Type := | |
6259 | Create_Null_Excluding_Itype | |
6260 | (T => New_Discr_Type, | |
6261 | Related_Nod => New_Discr, | |
6262 | Scope_Id => Current_Scope); | |
6263 | end if; | |
996ae0b0 RK |
6264 | end if; |
6265 | ||
6266 | if not Conforming_Types | |
6267 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
6268 | then | |
6269 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
6270 | return; | |
fbf5a39b | 6271 | else |
82c80734 RD |
6272 | -- Treat the new discriminant as an occurrence of the old one, |
6273 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
6274 | -- information, for completeness. |
6275 | ||
6276 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
6277 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
6278 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
6279 | end if; |
6280 | ||
6281 | -- Names must match | |
6282 | ||
6283 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
6284 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
6285 | return; | |
6286 | end if; | |
6287 | ||
6288 | -- Default expressions must match | |
6289 | ||
6290 | declare | |
6291 | NewD : constant Boolean := | |
6292 | Present (Expression (New_Discr)); | |
6293 | OldD : constant Boolean := | |
6294 | Present (Expression (Parent (Old_Discr))); | |
6295 | ||
6296 | begin | |
6297 | if NewD or OldD then | |
6298 | ||
6299 | -- The old default value has been analyzed and expanded, | |
6300 | -- because the current full declaration will have frozen | |
82c80734 RD |
6301 | -- everything before. The new default values have not been |
6302 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
6303 | |
6304 | if NewD then | |
21d27997 | 6305 | Preanalyze_Spec_Expression |
996ae0b0 RK |
6306 | (Expression (New_Discr), New_Discr_Type); |
6307 | end if; | |
6308 | ||
6309 | if not (NewD and OldD) | |
6310 | or else not Fully_Conformant_Expressions | |
6311 | (Expression (Parent (Old_Discr)), | |
6312 | Expression (New_Discr)) | |
6313 | ||
6314 | then | |
6315 | Conformance_Error | |
6316 | ("default expression for & does not match!", | |
6317 | New_Discr_Id); | |
6318 | return; | |
6319 | end if; | |
6320 | end if; | |
6321 | end; | |
6322 | ||
6323 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
6324 | ||
0ab80019 | 6325 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
6326 | declare |
6327 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
6328 | ||
6329 | begin | |
6330 | -- Grouping (use of comma in param lists) must be the same | |
6331 | -- This is where we catch a misconformance like: | |
6332 | ||
60370fb1 | 6333 | -- A, B : Integer |
996ae0b0 RK |
6334 | -- A : Integer; B : Integer |
6335 | ||
6336 | -- which are represented identically in the tree except | |
6337 | -- for the setting of the flags More_Ids and Prev_Ids. | |
6338 | ||
6339 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
6340 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
6341 | then | |
6342 | Conformance_Error | |
6343 | ("grouping of & does not match!", New_Discr_Id); | |
6344 | return; | |
6345 | end if; | |
6346 | end; | |
6347 | end if; | |
6348 | ||
6349 | Next_Discriminant (Old_Discr); | |
6350 | Next (New_Discr); | |
6351 | end loop; | |
6352 | ||
6353 | if Present (Old_Discr) then | |
6354 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
6355 | return; | |
6356 | ||
6357 | elsif Present (New_Discr) then | |
6358 | Conformance_Error | |
6359 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
6360 | return; | |
6361 | end if; | |
6362 | end Check_Discriminant_Conformance; | |
6363 | ||
6364 | ---------------------------- | |
6365 | -- Check_Fully_Conformant -- | |
6366 | ---------------------------- | |
6367 | ||
6368 | procedure Check_Fully_Conformant | |
6369 | (New_Id : Entity_Id; | |
6370 | Old_Id : Entity_Id; | |
6371 | Err_Loc : Node_Id := Empty) | |
6372 | is | |
6373 | Result : Boolean; | |
81db9d77 | 6374 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6375 | begin |
6376 | Check_Conformance | |
6377 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
6378 | end Check_Fully_Conformant; | |
6379 | ||
b420ba79 AC |
6380 | -------------------------- |
6381 | -- Check_Limited_Return -- | |
6382 | -------------------------- | |
6383 | ||
6384 | procedure Check_Limited_Return | |
6385 | (N : Node_Id; | |
6386 | Expr : Node_Id; | |
6387 | R_Type : Entity_Id) | |
6388 | is | |
6389 | begin | |
6390 | -- Ada 2005 (AI-318-02): Return-by-reference types have been removed and | |
6391 | -- replaced by anonymous access results. This is an incompatibility with | |
6392 | -- Ada 95. Not clear whether this should be enforced yet or perhaps | |
6393 | -- controllable with special switch. ??? | |
6394 | ||
6395 | -- A limited interface that is not immutably limited is OK | |
6396 | ||
6397 | if Is_Limited_Interface (R_Type) | |
6398 | and then | |
6399 | not (Is_Task_Interface (R_Type) | |
6400 | or else Is_Protected_Interface (R_Type) | |
6401 | or else Is_Synchronized_Interface (R_Type)) | |
6402 | then | |
6403 | null; | |
6404 | ||
6405 | elsif Is_Limited_Type (R_Type) | |
6406 | and then not Is_Interface (R_Type) | |
6407 | and then Comes_From_Source (N) | |
6408 | and then not In_Instance_Body | |
6409 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) | |
6410 | then | |
6411 | -- Error in Ada 2005 | |
6412 | ||
6413 | if Ada_Version >= Ada_2005 | |
6414 | and then not Debug_Flag_Dot_L | |
6415 | and then not GNAT_Mode | |
6416 | then | |
6417 | Error_Msg_N | |
6418 | ("(Ada 2005) cannot copy object of a limited type " | |
6419 | & "(RM-2005 6.5(5.5/2))", Expr); | |
6420 | ||
6421 | if Is_Limited_View (R_Type) then | |
6422 | Error_Msg_N | |
6423 | ("\return by reference not permitted in Ada 2005", Expr); | |
6424 | end if; | |
6425 | ||
6426 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
6427 | -- incompatibility. | |
6428 | ||
6429 | -- In GNAT mode, this is just a warning, to allow it to be evilly | |
6430 | -- turned off. Otherwise it is a real error. | |
6431 | ||
6432 | -- In a generic context, simplify the warning because it makes no | |
6433 | -- sense to discuss pass-by-reference or copy. | |
6434 | ||
6435 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then | |
6436 | if Inside_A_Generic then | |
6437 | Error_Msg_N | |
6438 | ("return of limited object not permitted in Ada 2005 " | |
6439 | & "(RM-2005 6.5(5.5/2))?y?", Expr); | |
6440 | ||
6441 | elsif Is_Limited_View (R_Type) then | |
6442 | Error_Msg_N | |
6443 | ("return by reference not permitted in Ada 2005 " | |
6444 | & "(RM-2005 6.5(5.5/2))?y?", Expr); | |
6445 | else | |
6446 | Error_Msg_N | |
6447 | ("cannot copy object of a limited type in Ada 2005 " | |
6448 | & "(RM-2005 6.5(5.5/2))?y?", Expr); | |
6449 | end if; | |
6450 | ||
99bba92c | 6451 | -- Ada 95 mode, and compatibility warnings disabled |
b420ba79 AC |
6452 | |
6453 | else | |
99bba92c AC |
6454 | pragma Assert (Ada_Version <= Ada_95); |
6455 | pragma Assert (not (Warn_On_Ada_2005_Compatibility or GNAT_Mode)); | |
b420ba79 AC |
6456 | return; -- skip continuation messages below |
6457 | end if; | |
6458 | ||
6459 | if not Inside_A_Generic then | |
6460 | Error_Msg_N | |
6461 | ("\consider switching to return of access type", Expr); | |
6462 | Explain_Limited_Type (R_Type, Expr); | |
6463 | end if; | |
6464 | end if; | |
6465 | end Check_Limited_Return; | |
6466 | ||
996ae0b0 RK |
6467 | --------------------------- |
6468 | -- Check_Mode_Conformant -- | |
6469 | --------------------------- | |
6470 | ||
6471 | procedure Check_Mode_Conformant | |
6472 | (New_Id : Entity_Id; | |
6473 | Old_Id : Entity_Id; | |
6474 | Err_Loc : Node_Id := Empty; | |
6475 | Get_Inst : Boolean := False) | |
6476 | is | |
6477 | Result : Boolean; | |
81db9d77 | 6478 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6479 | begin |
6480 | Check_Conformance | |
6481 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
6482 | end Check_Mode_Conformant; | |
6483 | ||
fbf5a39b | 6484 | -------------------------------- |
758c442c | 6485 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
6486 | -------------------------------- |
6487 | ||
758c442c | 6488 | procedure Check_Overriding_Indicator |
ec4867fa | 6489 | (Subp : Entity_Id; |
5d37ba92 ES |
6490 | Overridden_Subp : Entity_Id; |
6491 | Is_Primitive : Boolean) | |
fbf5a39b | 6492 | is |
758c442c GD |
6493 | Decl : Node_Id; |
6494 | Spec : Node_Id; | |
fbf5a39b AC |
6495 | |
6496 | begin | |
ec4867fa | 6497 | -- No overriding indicator for literals |
fbf5a39b | 6498 | |
ec4867fa | 6499 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 6500 | return; |
fbf5a39b | 6501 | |
ec4867fa ES |
6502 | elsif Ekind (Subp) = E_Entry then |
6503 | Decl := Parent (Subp); | |
6504 | ||
53b10ce9 AC |
6505 | -- No point in analyzing a malformed operator |
6506 | ||
6507 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
6508 | and then Error_Posted (Subp) | |
6509 | then | |
6510 | return; | |
6511 | ||
758c442c GD |
6512 | else |
6513 | Decl := Unit_Declaration_Node (Subp); | |
6514 | end if; | |
fbf5a39b | 6515 | |
800621e0 RD |
6516 | if Nkind_In (Decl, N_Subprogram_Body, |
6517 | N_Subprogram_Body_Stub, | |
6518 | N_Subprogram_Declaration, | |
6519 | N_Abstract_Subprogram_Declaration, | |
6520 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
6521 | then |
6522 | Spec := Specification (Decl); | |
ec4867fa ES |
6523 | |
6524 | elsif Nkind (Decl) = N_Entry_Declaration then | |
6525 | Spec := Decl; | |
6526 | ||
758c442c GD |
6527 | else |
6528 | return; | |
6529 | end if; | |
fbf5a39b | 6530 | |
e7d72fb9 AC |
6531 | -- The overriding operation is type conformant with the overridden one, |
6532 | -- but the names of the formals are not required to match. If the names | |
6823270c | 6533 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
6534 | -- source of confusion that is worth diagnosing. Controlling formals |
6535 | -- often carry names that reflect the type, and it is not worthwhile | |
6536 | -- requiring that their names match. | |
6537 | ||
c9e7bd8e | 6538 | if Present (Overridden_Subp) |
e7d72fb9 AC |
6539 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
6540 | then | |
6541 | declare | |
6542 | Form1 : Entity_Id; | |
6543 | Form2 : Entity_Id; | |
6544 | ||
6545 | begin | |
6546 | Form1 := First_Formal (Subp); | |
6547 | Form2 := First_Formal (Overridden_Subp); | |
6548 | ||
c9e7bd8e AC |
6549 | -- If the overriding operation is a synchronized operation, skip |
6550 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
6551 | -- implicit in the new one. If the operation is declared in the |
6552 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 6553 | |
6823270c AC |
6554 | if Is_Concurrent_Type (Scope (Subp)) |
6555 | and then Is_Tagged_Type (Scope (Subp)) | |
6556 | and then not Has_Completion (Scope (Subp)) | |
6557 | then | |
c9e7bd8e AC |
6558 | Form2 := Next_Formal (Form2); |
6559 | end if; | |
6560 | ||
e7d72fb9 AC |
6561 | if Present (Form1) then |
6562 | Form1 := Next_Formal (Form1); | |
6563 | Form2 := Next_Formal (Form2); | |
6564 | end if; | |
6565 | ||
6566 | while Present (Form1) loop | |
6567 | if not Is_Controlling_Formal (Form1) | |
6568 | and then Present (Next_Formal (Form2)) | |
6569 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
6570 | then | |
6571 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
6572 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 6573 | Error_Msg_NE |
19d846a0 | 6574 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
6575 | Form1, Form1); |
6576 | exit; | |
6577 | end if; | |
6578 | ||
6579 | Next_Formal (Form1); | |
6580 | Next_Formal (Form2); | |
6581 | end loop; | |
6582 | end; | |
6583 | end if; | |
6584 | ||
676e8420 AC |
6585 | -- If there is an overridden subprogram, then check that there is no |
6586 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
08f4f172 | 6587 | |
51bf9bdf AC |
6588 | -- This is not done if the overridden subprogram is marked as hidden, |
6589 | -- which can occur for the case of inherited controlled operations | |
6590 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
08f4f172 JS |
6591 | -- subprogram is not itself hidden or we are within a generic instance, |
6592 | -- in which case the hidden flag may have been modified for the | |
6593 | -- expansion of the instance. | |
6594 | ||
6595 | -- (Note: This condition could probably be simplified, leaving out the | |
6596 | -- testing for the specific controlled cases, but it seems safer and | |
6597 | -- clearer this way, and echoes similar special-case tests of this | |
6598 | -- kind in other places.) | |
51bf9bdf | 6599 | |
fd0d899b | 6600 | if Present (Overridden_Subp) |
51bf9bdf AC |
6601 | and then (not Is_Hidden (Overridden_Subp) |
6602 | or else | |
b69cd36a AC |
6603 | (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
6604 | Name_Adjust, | |
6605 | Name_Finalize) | |
f0709ca6 | 6606 | and then Present (Alias (Overridden_Subp)) |
08f4f172 JS |
6607 | and then (not Is_Hidden (Alias (Overridden_Subp)) |
6608 | or else In_Instance))) | |
fd0d899b | 6609 | then |
ec4867fa ES |
6610 | if Must_Not_Override (Spec) then |
6611 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 6612 | |
ec4867fa | 6613 | if Ekind (Subp) = E_Entry then |
ed2233dc | 6614 | Error_Msg_NE |
5d37ba92 | 6615 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 6616 | else |
ed2233dc | 6617 | Error_Msg_NE |
5d37ba92 | 6618 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 6619 | end if; |
21d27997 | 6620 | |
bd603506 | 6621 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
6622 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
6623 | -- operation. This operation should not be inherited by other limited | |
6624 | -- controlled types. An explicit Adjust for them is not overriding. | |
6625 | ||
6626 | elsif Must_Override (Spec) | |
6627 | and then Chars (Overridden_Subp) = Name_Adjust | |
6628 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
6629 | and then Present (Alias (Overridden_Subp)) | |
8ab31c0c | 6630 | and then In_Predefined_Unit (Alias (Overridden_Subp)) |
24a120ac | 6631 | then |
b043ae01 AC |
6632 | Get_Name_String |
6633 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))); | |
24a120ac AC |
6634 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
6635 | ||
21d27997 | 6636 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
6637 | if Is_Init_Proc (Subp) then |
6638 | null; | |
6639 | ||
6640 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
6641 | |
6642 | -- For entities generated by Derive_Subprograms the overridden | |
6643 | -- operation is the inherited primitive (which is available | |
6644 | -- through the attribute alias) | |
6645 | ||
6646 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 6647 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 6648 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
6649 | and then Find_Dispatching_Type (Overridden_Subp) = |
6650 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
6651 | and then Present (Alias (Overridden_Subp)) |
6652 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
6653 | then | |
039538bc AC |
6654 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); |
6655 | Inherit_Subprogram_Contract (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 6656 | |
1c1289e7 | 6657 | else |
039538bc AC |
6658 | Set_Overridden_Operation (Subp, Overridden_Subp); |
6659 | Inherit_Subprogram_Contract (Subp, Overridden_Subp); | |
1c1289e7 AC |
6660 | end if; |
6661 | end if; | |
ec4867fa | 6662 | end if; |
f937473f | 6663 | |
618fb570 AC |
6664 | -- If primitive flag is set or this is a protected operation, then |
6665 | -- the operation is overriding at the point of its declaration, so | |
6666 | -- warn if necessary. Otherwise it may have been declared before the | |
6667 | -- operation it overrides and no check is required. | |
3c25856a AC |
6668 | |
6669 | if Style_Check | |
618fb570 AC |
6670 | and then not Must_Override (Spec) |
6671 | and then (Is_Primitive | |
6672 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 6673 | then |
235f4375 AC |
6674 | Style.Missing_Overriding (Decl, Subp); |
6675 | end if; | |
6676 | ||
53b10ce9 AC |
6677 | -- If Subp is an operator, it may override a predefined operation, if |
6678 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 6679 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
6680 | -- representation for predefined operators. We have to check whether the |
6681 | -- signature of Subp matches that of a predefined operator. Note that | |
6682 | -- first argument provides the name of the operator, and the second | |
6683 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
6684 | -- If the indicator is overriding, then the operator must match a |
6685 | -- predefined signature, because we know already that there is no | |
6686 | -- explicit overridden operation. | |
f937473f | 6687 | |
21d27997 | 6688 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 6689 | if Must_Not_Override (Spec) then |
f937473f | 6690 | |
806f6d37 AC |
6691 | -- If this is not a primitive or a protected subprogram, then |
6692 | -- "not overriding" is illegal. | |
618fb570 | 6693 | |
806f6d37 AC |
6694 | if not Is_Primitive |
6695 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
6696 | then | |
3ccedacc AC |
6697 | Error_Msg_N ("overriding indicator only allowed " |
6698 | & "if subprogram is primitive", Subp); | |
618fb570 | 6699 | |
806f6d37 AC |
6700 | elsif Can_Override_Operator (Subp) then |
6701 | Error_Msg_NE | |
6702 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
6703 | end if; | |
f937473f | 6704 | |
806f6d37 AC |
6705 | elsif Must_Override (Spec) then |
6706 | if No (Overridden_Operation (Subp)) | |
6707 | and then not Can_Override_Operator (Subp) | |
6708 | then | |
6709 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
6710 | end if; | |
5d37ba92 | 6711 | |
806f6d37 AC |
6712 | elsif not Error_Posted (Subp) |
6713 | and then Style_Check | |
6714 | and then Can_Override_Operator (Subp) | |
8ab31c0c | 6715 | and then not In_Predefined_Unit (Subp) |
806f6d37 AC |
6716 | then |
6717 | -- If style checks are enabled, indicate that the indicator is | |
6718 | -- missing. However, at the point of declaration, the type of | |
6719 | -- which this is a primitive operation may be private, in which | |
6720 | -- case the indicator would be premature. | |
235f4375 | 6721 | |
806f6d37 AC |
6722 | if Has_Private_Declaration (Etype (Subp)) |
6723 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 6724 | then |
806f6d37 AC |
6725 | null; |
6726 | else | |
6727 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 6728 | end if; |
806f6d37 | 6729 | end if; |
21d27997 RD |
6730 | |
6731 | elsif Must_Override (Spec) then | |
6732 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 6733 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 6734 | else |
ed2233dc | 6735 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 6736 | end if; |
5d37ba92 ES |
6737 | |
6738 | -- If the operation is marked "not overriding" and it's not primitive | |
6739 | -- then an error is issued, unless this is an operation of a task or | |
6740 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
6741 | -- has been specified have already been checked above. | |
6742 | ||
6743 | elsif Must_Not_Override (Spec) | |
6744 | and then not Is_Primitive | |
6745 | and then Ekind (Subp) /= E_Entry | |
6746 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
6747 | then | |
ed2233dc | 6748 | Error_Msg_N |
5d37ba92 ES |
6749 | ("overriding indicator only allowed if subprogram is primitive", |
6750 | Subp); | |
5d37ba92 | 6751 | return; |
fbf5a39b | 6752 | end if; |
758c442c | 6753 | end Check_Overriding_Indicator; |
fbf5a39b | 6754 | |
996ae0b0 RK |
6755 | ------------------- |
6756 | -- Check_Returns -- | |
6757 | ------------------- | |
6758 | ||
0a36105d JM |
6759 | -- Note: this procedure needs to know far too much about how the expander |
6760 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
6761 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
6762 | -- works, but is not very clean. It would be better if the expansion | |
6763 | -- routines would leave Original_Node working nicely, and we could use | |
6764 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
6765 | ||
996ae0b0 RK |
6766 | procedure Check_Returns |
6767 | (HSS : Node_Id; | |
6768 | Mode : Character; | |
c8ef728f ES |
6769 | Err : out Boolean; |
6770 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
6771 | is |
6772 | Handler : Node_Id; | |
6773 | ||
6774 | procedure Check_Statement_Sequence (L : List_Id); | |
6775 | -- Internal recursive procedure to check a list of statements for proper | |
6776 | -- termination by a return statement (or a transfer of control or a | |
6777 | -- compound statement that is itself internally properly terminated). | |
6778 | ||
6779 | ------------------------------ | |
6780 | -- Check_Statement_Sequence -- | |
6781 | ------------------------------ | |
6782 | ||
6783 | procedure Check_Statement_Sequence (L : List_Id) is | |
6784 | Last_Stm : Node_Id; | |
0a36105d | 6785 | Stm : Node_Id; |
996ae0b0 RK |
6786 | Kind : Node_Kind; |
6787 | ||
7b27e183 AC |
6788 | function Assert_False return Boolean; |
6789 | -- Returns True if Last_Stm is a pragma Assert (False) that has been | |
6790 | -- rewritten as a null statement when assertions are off. The assert | |
6791 | -- is not active, but it is still enough to kill the warning. | |
6792 | ||
6793 | ------------------ | |
6794 | -- Assert_False -- | |
6795 | ------------------ | |
6796 | ||
6797 | function Assert_False return Boolean is | |
6798 | Orig : constant Node_Id := Original_Node (Last_Stm); | |
6799 | ||
6800 | begin | |
6801 | if Nkind (Orig) = N_Pragma | |
6e759c2a | 6802 | and then Pragma_Name (Orig) = Name_Assert |
7b27e183 AC |
6803 | and then not Error_Posted (Orig) |
6804 | then | |
6805 | declare | |
6806 | Arg : constant Node_Id := | |
6807 | First (Pragma_Argument_Associations (Orig)); | |
6808 | Exp : constant Node_Id := Expression (Arg); | |
6809 | begin | |
6810 | return Nkind (Exp) = N_Identifier | |
6811 | and then Chars (Exp) = Name_False; | |
6812 | end; | |
6813 | ||
6814 | else | |
6815 | return False; | |
6816 | end if; | |
6817 | end Assert_False; | |
6818 | ||
6819 | -- Local variables | |
6820 | ||
996ae0b0 RK |
6821 | Raise_Exception_Call : Boolean; |
6822 | -- Set True if statement sequence terminated by Raise_Exception call | |
6823 | -- or a Reraise_Occurrence call. | |
6824 | ||
7b27e183 AC |
6825 | -- Start of processing for Check_Statement_Sequence |
6826 | ||
996ae0b0 RK |
6827 | begin |
6828 | Raise_Exception_Call := False; | |
6829 | ||
6830 | -- Get last real statement | |
6831 | ||
6832 | Last_Stm := Last (L); | |
6833 | ||
0a36105d JM |
6834 | -- Deal with digging out exception handler statement sequences that |
6835 | -- have been transformed by the local raise to goto optimization. | |
6836 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
6837 | -- optimization has occurred, we are looking at something like: | |
6838 | ||
6839 | -- begin | |
6840 | -- original stmts in block | |
6841 | ||
6842 | -- exception \ | |
6843 | -- when excep1 => | | |
6844 | -- goto L1; | omitted if No_Exception_Propagation | |
6845 | -- when excep2 => | | |
6846 | -- goto L2; / | |
6847 | -- end; | |
6848 | ||
6849 | -- goto L3; -- skip handler when exception not raised | |
6850 | ||
6851 | -- <<L1>> -- target label for local exception | |
6852 | -- begin | |
6853 | -- estmts1 | |
6854 | -- end; | |
6855 | ||
6856 | -- goto L3; | |
6857 | ||
6858 | -- <<L2>> | |
6859 | -- begin | |
6860 | -- estmts2 | |
6861 | -- end; | |
6862 | ||
6863 | -- <<L3>> | |
6864 | ||
6865 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
6866 | -- sequences (which were the original sequences of statements in | |
6867 | -- the exception handlers) and check them. | |
6868 | ||
8fde064e | 6869 | if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
0a36105d JM |
6870 | Stm := Last_Stm; |
6871 | loop | |
6872 | Prev (Stm); | |
6873 | exit when No (Stm); | |
6874 | exit when Nkind (Stm) /= N_Block_Statement; | |
6875 | exit when not Exception_Junk (Stm); | |
6876 | Prev (Stm); | |
6877 | exit when No (Stm); | |
6878 | exit when Nkind (Stm) /= N_Label; | |
6879 | exit when not Exception_Junk (Stm); | |
6880 | Check_Statement_Sequence | |
6881 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
6882 | ||
6883 | Prev (Stm); | |
6884 | Last_Stm := Stm; | |
6885 | exit when No (Stm); | |
6886 | exit when Nkind (Stm) /= N_Goto_Statement; | |
6887 | exit when not Exception_Junk (Stm); | |
6888 | end loop; | |
6889 | end if; | |
6890 | ||
996ae0b0 RK |
6891 | -- Don't count pragmas |
6892 | ||
6893 | while Nkind (Last_Stm) = N_Pragma | |
6894 | ||
6895 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
6896 | ||
6897 | or else | |
6898 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
6899 | and then | |
6900 | Nkind (Name (Last_Stm)) = N_Identifier | |
6901 | and then | |
6902 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
6903 | ||
6904 | -- Don't count exception junk | |
6905 | ||
6906 | or else | |
800621e0 RD |
6907 | (Nkind_In (Last_Stm, N_Goto_Statement, |
6908 | N_Label, | |
6909 | N_Object_Declaration) | |
8fde064e | 6910 | and then Exception_Junk (Last_Stm)) |
0a36105d JM |
6911 | or else Nkind (Last_Stm) in N_Push_xxx_Label |
6912 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
e3b3266c AC |
6913 | |
6914 | -- Inserted code, such as finalization calls, is irrelevant: we only | |
6915 | -- need to check original source. | |
6916 | ||
6917 | or else Is_Rewrite_Insertion (Last_Stm) | |
996ae0b0 RK |
6918 | loop |
6919 | Prev (Last_Stm); | |
6920 | end loop; | |
6921 | ||
6922 | -- Here we have the "real" last statement | |
6923 | ||
6924 | Kind := Nkind (Last_Stm); | |
6925 | ||
6926 | -- Transfer of control, OK. Note that in the No_Return procedure | |
6927 | -- case, we already diagnosed any explicit return statements, so | |
6928 | -- we can treat them as OK in this context. | |
6929 | ||
6930 | if Is_Transfer (Last_Stm) then | |
6931 | return; | |
6932 | ||
6933 | -- Check cases of explicit non-indirect procedure calls | |
6934 | ||
6935 | elsif Kind = N_Procedure_Call_Statement | |
6936 | and then Is_Entity_Name (Name (Last_Stm)) | |
6937 | then | |
6938 | -- Check call to Raise_Exception procedure which is treated | |
6939 | -- specially, as is a call to Reraise_Occurrence. | |
6940 | ||
6941 | -- We suppress the warning in these cases since it is likely that | |
6942 | -- the programmer really does not expect to deal with the case | |
6943 | -- of Null_Occurrence, and thus would find a warning about a | |
6944 | -- missing return curious, and raising Program_Error does not | |
6945 | -- seem such a bad behavior if this does occur. | |
6946 | ||
c8ef728f ES |
6947 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
6948 | -- behavior will be to raise Constraint_Error (see AI-329). | |
6949 | ||
996ae0b0 RK |
6950 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
6951 | or else | |
6952 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
6953 | then | |
6954 | Raise_Exception_Call := True; | |
6955 | ||
6956 | -- For Raise_Exception call, test first argument, if it is | |
6957 | -- an attribute reference for a 'Identity call, then we know | |
6958 | -- that the call cannot possibly return. | |
6959 | ||
6960 | declare | |
6961 | Arg : constant Node_Id := | |
6962 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
6963 | begin |
6964 | if Nkind (Arg) = N_Attribute_Reference | |
6965 | and then Attribute_Name (Arg) = Name_Identity | |
6966 | then | |
6967 | return; | |
6968 | end if; | |
6969 | end; | |
6970 | end if; | |
6971 | ||
6972 | -- If statement, need to look inside if there is an else and check | |
6973 | -- each constituent statement sequence for proper termination. | |
6974 | ||
6975 | elsif Kind = N_If_Statement | |
6976 | and then Present (Else_Statements (Last_Stm)) | |
6977 | then | |
6978 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
6979 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6980 | ||
6981 | if Present (Elsif_Parts (Last_Stm)) then | |
6982 | declare | |
6983 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
6984 | ||
6985 | begin | |
6986 | while Present (Elsif_Part) loop | |
6987 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
6988 | Next (Elsif_Part); | |
6989 | end loop; | |
6990 | end; | |
6991 | end if; | |
6992 | ||
6993 | return; | |
6994 | ||
6995 | -- Case statement, check each case for proper termination | |
6996 | ||
6997 | elsif Kind = N_Case_Statement then | |
6998 | declare | |
6999 | Case_Alt : Node_Id; | |
996ae0b0 RK |
7000 | begin |
7001 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
7002 | while Present (Case_Alt) loop | |
7003 | Check_Statement_Sequence (Statements (Case_Alt)); | |
7004 | Next_Non_Pragma (Case_Alt); | |
7005 | end loop; | |
7006 | end; | |
7007 | ||
7008 | return; | |
7009 | ||
7010 | -- Block statement, check its handled sequence of statements | |
7011 | ||
7012 | elsif Kind = N_Block_Statement then | |
7013 | declare | |
7014 | Err1 : Boolean; | |
7015 | ||
7016 | begin | |
7017 | Check_Returns | |
7018 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
7019 | ||
7020 | if Err1 then | |
7021 | Err := True; | |
7022 | end if; | |
7023 | ||
7024 | return; | |
7025 | end; | |
7026 | ||
7027 | -- Loop statement. If there is an iteration scheme, we can definitely | |
7028 | -- fall out of the loop. Similarly if there is an exit statement, we | |
7029 | -- can fall out. In either case we need a following return. | |
7030 | ||
7031 | elsif Kind = N_Loop_Statement then | |
7032 | if Present (Iteration_Scheme (Last_Stm)) | |
7033 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
7034 | then | |
7035 | null; | |
7036 | ||
f3d57416 RW |
7037 | -- A loop with no exit statement or iteration scheme is either |
7038 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
7039 | -- In either case, no warning is required. |
7040 | ||
7041 | else | |
7042 | return; | |
7043 | end if; | |
7044 | ||
7045 | -- Timed entry call, check entry call and delay alternatives | |
7046 | ||
7047 | -- Note: in expanded code, the timed entry call has been converted | |
7048 | -- to a set of expanded statements on which the check will work | |
7049 | -- correctly in any case. | |
7050 | ||
7051 | elsif Kind = N_Timed_Entry_Call then | |
7052 | declare | |
7053 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
7054 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
7055 | ||
7056 | begin | |
7057 | -- If statement sequence of entry call alternative is missing, | |
7058 | -- then we can definitely fall through, and we post the error | |
7059 | -- message on the entry call alternative itself. | |
7060 | ||
7061 | if No (Statements (ECA)) then | |
7062 | Last_Stm := ECA; | |
7063 | ||
7064 | -- If statement sequence of delay alternative is missing, then | |
7065 | -- we can definitely fall through, and we post the error | |
7066 | -- message on the delay alternative itself. | |
7067 | ||
7068 | -- Note: if both ECA and DCA are missing the return, then we | |
7069 | -- post only one message, should be enough to fix the bugs. | |
7070 | -- If not we will get a message next time on the DCA when the | |
a90bd866 | 7071 | -- ECA is fixed. |
996ae0b0 RK |
7072 | |
7073 | elsif No (Statements (DCA)) then | |
7074 | Last_Stm := DCA; | |
7075 | ||
7076 | -- Else check both statement sequences | |
7077 | ||
7078 | else | |
7079 | Check_Statement_Sequence (Statements (ECA)); | |
7080 | Check_Statement_Sequence (Statements (DCA)); | |
7081 | return; | |
7082 | end if; | |
7083 | end; | |
7084 | ||
7085 | -- Conditional entry call, check entry call and else part | |
7086 | ||
7087 | -- Note: in expanded code, the conditional entry call has been | |
7088 | -- converted to a set of expanded statements on which the check | |
7089 | -- will work correctly in any case. | |
7090 | ||
7091 | elsif Kind = N_Conditional_Entry_Call then | |
7092 | declare | |
7093 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
7094 | ||
7095 | begin | |
7096 | -- If statement sequence of entry call alternative is missing, | |
7097 | -- then we can definitely fall through, and we post the error | |
7098 | -- message on the entry call alternative itself. | |
7099 | ||
7100 | if No (Statements (ECA)) then | |
7101 | Last_Stm := ECA; | |
7102 | ||
7103 | -- Else check statement sequence and else part | |
7104 | ||
7105 | else | |
7106 | Check_Statement_Sequence (Statements (ECA)); | |
7107 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
7108 | return; | |
7109 | end if; | |
7110 | end; | |
7111 | end if; | |
7112 | ||
7113 | -- If we fall through, issue appropriate message | |
7114 | ||
7115 | if Mode = 'F' then | |
7b27e183 AC |
7116 | |
7117 | -- Kill warning if last statement is a raise exception call, | |
7118 | -- or a pragma Assert (False). Note that with assertions enabled, | |
7119 | -- such a pragma has been converted into a raise exception call | |
7120 | -- already, so the Assert_False is for the assertions off case. | |
7121 | ||
7122 | if not Raise_Exception_Call and then not Assert_False then | |
b465ef6f AC |
7123 | |
7124 | -- In GNATprove mode, it is an error to have a missing return | |
7125 | ||
43417b90 | 7126 | Error_Msg_Warn := SPARK_Mode /= On; |
7b27e183 AC |
7127 | |
7128 | -- Issue error message or warning | |
7129 | ||
4a28b181 AC |
7130 | Error_Msg_N |
7131 | ("RETURN statement missing following this statement<<!", | |
7132 | Last_Stm); | |
7133 | Error_Msg_N | |
7134 | ("\Program_Error ]<<!", Last_Stm); | |
996ae0b0 RK |
7135 | end if; |
7136 | ||
7137 | -- Note: we set Err even though we have not issued a warning | |
7138 | -- because we still have a case of a missing return. This is | |
7139 | -- an extremely marginal case, probably will never be noticed | |
7140 | -- but we might as well get it right. | |
7141 | ||
7142 | Err := True; | |
7143 | ||
c8ef728f ES |
7144 | -- Otherwise we have the case of a procedure marked No_Return |
7145 | ||
996ae0b0 | 7146 | else |
800621e0 | 7147 | if not Raise_Exception_Call then |
4a28b181 AC |
7148 | if GNATprove_Mode then |
7149 | Error_Msg_N | |
c99ab5f9 HK |
7150 | ("implied return after this statement would have raised " |
7151 | & "Program_Error", Last_Stm); | |
e9238cc1 | 7152 | |
c99ab5f9 HK |
7153 | -- In normal compilation mode, do not warn on a generated call |
7154 | -- (e.g. in the body of a renaming as completion). | |
e9238cc1 AC |
7155 | |
7156 | elsif Comes_From_Source (Last_Stm) then | |
4a28b181 | 7157 | Error_Msg_N |
c99ab5f9 HK |
7158 | ("implied return after this statement will raise " |
7159 | & "Program_Error??", Last_Stm); | |
4a28b181 AC |
7160 | end if; |
7161 | ||
43417b90 | 7162 | Error_Msg_Warn := SPARK_Mode /= On; |
800621e0 | 7163 | Error_Msg_NE |
4a28b181 | 7164 | ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
800621e0 | 7165 | end if; |
c8ef728f ES |
7166 | |
7167 | declare | |
7168 | RE : constant Node_Id := | |
7169 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
7170 | Reason => PE_Implicit_Return); | |
7171 | begin | |
7172 | Insert_After (Last_Stm, RE); | |
7173 | Analyze (RE); | |
7174 | end; | |
996ae0b0 RK |
7175 | end if; |
7176 | end Check_Statement_Sequence; | |
7177 | ||
7178 | -- Start of processing for Check_Returns | |
7179 | ||
7180 | begin | |
7181 | Err := False; | |
7182 | Check_Statement_Sequence (Statements (HSS)); | |
7183 | ||
7184 | if Present (Exception_Handlers (HSS)) then | |
7185 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
7186 | while Present (Handler) loop | |
7187 | Check_Statement_Sequence (Statements (Handler)); | |
7188 | Next_Non_Pragma (Handler); | |
7189 | end loop; | |
7190 | end if; | |
7191 | end Check_Returns; | |
7192 | ||
7193 | ---------------------------- | |
7194 | -- Check_Subprogram_Order -- | |
7195 | ---------------------------- | |
7196 | ||
7197 | procedure Check_Subprogram_Order (N : Node_Id) is | |
7198 | ||
7199 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
7200 | -- This is used to check if S1 > S2 in the sense required by this test, |
7201 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 7202 | |
82c80734 RD |
7203 | ----------------------------- |
7204 | -- Subprogram_Name_Greater -- | |
7205 | ----------------------------- | |
7206 | ||
996ae0b0 RK |
7207 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
7208 | L1, L2 : Positive; | |
7209 | N1, N2 : Natural; | |
7210 | ||
7211 | begin | |
67336960 AC |
7212 | -- Deal with special case where names are identical except for a |
7213 | -- numerical suffix. These are handled specially, taking the numeric | |
7214 | -- ordering from the suffix into account. | |
996ae0b0 RK |
7215 | |
7216 | L1 := S1'Last; | |
7217 | while S1 (L1) in '0' .. '9' loop | |
7218 | L1 := L1 - 1; | |
7219 | end loop; | |
7220 | ||
7221 | L2 := S2'Last; | |
7222 | while S2 (L2) in '0' .. '9' loop | |
7223 | L2 := L2 - 1; | |
7224 | end loop; | |
7225 | ||
67336960 | 7226 | -- If non-numeric parts non-equal, do straight compare |
996ae0b0 | 7227 | |
67336960 AC |
7228 | if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
7229 | return S1 > S2; | |
996ae0b0 RK |
7230 | |
7231 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
7232 | -- that a missing suffix is treated as numeric zero in this test. | |
7233 | ||
7234 | else | |
7235 | N1 := 0; | |
7236 | while L1 < S1'Last loop | |
7237 | L1 := L1 + 1; | |
7238 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
7239 | end loop; | |
7240 | ||
7241 | N2 := 0; | |
7242 | while L2 < S2'Last loop | |
7243 | L2 := L2 + 1; | |
7244 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
7245 | end loop; | |
7246 | ||
7247 | return N1 > N2; | |
7248 | end if; | |
7249 | end Subprogram_Name_Greater; | |
7250 | ||
7251 | -- Start of processing for Check_Subprogram_Order | |
7252 | ||
7253 | begin | |
7254 | -- Check body in alpha order if this is option | |
7255 | ||
fbf5a39b | 7256 | if Style_Check |
bc202b70 | 7257 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
7258 | and then Nkind (N) = N_Subprogram_Body |
7259 | and then Comes_From_Source (N) | |
7260 | and then In_Extended_Main_Source_Unit (N) | |
7261 | then | |
7262 | declare | |
7263 | LSN : String_Ptr | |
7264 | renames Scope_Stack.Table | |
7265 | (Scope_Stack.Last).Last_Subprogram_Name; | |
7266 | ||
7267 | Body_Id : constant Entity_Id := | |
7268 | Defining_Entity (Specification (N)); | |
7269 | ||
7270 | begin | |
7271 | Get_Decoded_Name_String (Chars (Body_Id)); | |
7272 | ||
7273 | if LSN /= null then | |
7274 | if Subprogram_Name_Greater | |
7275 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
7276 | then | |
7277 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
7278 | end if; | |
7279 | ||
7280 | Free (LSN); | |
7281 | end if; | |
7282 | ||
7283 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
7284 | end; | |
7285 | end if; | |
7286 | end Check_Subprogram_Order; | |
7287 | ||
7288 | ------------------------------ | |
7289 | -- Check_Subtype_Conformant -- | |
7290 | ------------------------------ | |
7291 | ||
7292 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
7293 | (New_Id : Entity_Id; |
7294 | Old_Id : Entity_Id; | |
7295 | Err_Loc : Node_Id := Empty; | |
f307415a AC |
7296 | Skip_Controlling_Formals : Boolean := False; |
7297 | Get_Inst : Boolean := False) | |
996ae0b0 RK |
7298 | is |
7299 | Result : Boolean; | |
81db9d77 | 7300 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7301 | begin |
7302 | Check_Conformance | |
ce2b6ba5 | 7303 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
f307415a AC |
7304 | Skip_Controlling_Formals => Skip_Controlling_Formals, |
7305 | Get_Inst => Get_Inst); | |
996ae0b0 RK |
7306 | end Check_Subtype_Conformant; |
7307 | ||
42f11e4c AC |
7308 | ----------------------------------- |
7309 | -- Check_Synchronized_Overriding -- | |
7310 | ----------------------------------- | |
7311 | ||
7312 | procedure Check_Synchronized_Overriding | |
7313 | (Def_Id : Entity_Id; | |
7314 | Overridden_Subp : out Entity_Id) | |
7315 | is | |
7316 | Ifaces_List : Elist_Id; | |
7317 | In_Scope : Boolean; | |
7318 | Typ : Entity_Id; | |
7319 | ||
432c8cdd ES |
7320 | function Is_Valid_Formal (F : Entity_Id) return Boolean; |
7321 | -- Predicate for legality rule in 9.4 (11.9/2): If an inherited | |
7322 | -- subprogram is implemented by a protected procedure or entry, | |
7323 | -- its first parameter must be out, in out, or access-to-variable. | |
7324 | ||
42f11e4c AC |
7325 | function Matches_Prefixed_View_Profile |
7326 | (Prim_Params : List_Id; | |
7327 | Iface_Params : List_Id) return Boolean; | |
7328 | -- Determine whether a subprogram's parameter profile Prim_Params | |
7329 | -- matches that of a potentially overridden interface subprogram | |
7330 | -- Iface_Params. Also determine if the type of first parameter of | |
7331 | -- Iface_Params is an implemented interface. | |
7332 | ||
432c8cdd ES |
7333 | ---------------------- |
7334 | -- Is_Valid_Formal -- | |
7335 | ---------------------- | |
7336 | ||
7337 | function Is_Valid_Formal (F : Entity_Id) return Boolean is | |
7338 | begin | |
7339 | return | |
7340 | Ekind_In (F, E_In_Out_Parameter, E_Out_Parameter) | |
7341 | or else | |
7342 | (Nkind (Parameter_Type (Parent (F))) = N_Access_Definition | |
7343 | and then not Constant_Present (Parameter_Type (Parent (F)))); | |
7344 | end Is_Valid_Formal; | |
7345 | ||
42f11e4c AC |
7346 | ----------------------------------- |
7347 | -- Matches_Prefixed_View_Profile -- | |
7348 | ----------------------------------- | |
7349 | ||
7350 | function Matches_Prefixed_View_Profile | |
7351 | (Prim_Params : List_Id; | |
7352 | Iface_Params : List_Id) return Boolean | |
7353 | is | |
42f11e4c AC |
7354 | function Is_Implemented |
7355 | (Ifaces_List : Elist_Id; | |
7356 | Iface : Entity_Id) return Boolean; | |
7357 | -- Determine if Iface is implemented by the current task or | |
7358 | -- protected type. | |
7359 | ||
7360 | -------------------- | |
7361 | -- Is_Implemented -- | |
7362 | -------------------- | |
7363 | ||
7364 | function Is_Implemented | |
7365 | (Ifaces_List : Elist_Id; | |
7366 | Iface : Entity_Id) return Boolean | |
7367 | is | |
7368 | Iface_Elmt : Elmt_Id; | |
7369 | ||
7370 | begin | |
7371 | Iface_Elmt := First_Elmt (Ifaces_List); | |
7372 | while Present (Iface_Elmt) loop | |
7373 | if Node (Iface_Elmt) = Iface then | |
7374 | return True; | |
7375 | end if; | |
7376 | ||
7377 | Next_Elmt (Iface_Elmt); | |
7378 | end loop; | |
7379 | ||
7380 | return False; | |
7381 | end Is_Implemented; | |
7382 | ||
bac5ba15 AC |
7383 | -- Local variables |
7384 | ||
7385 | Iface_Id : Entity_Id; | |
7386 | Iface_Param : Node_Id; | |
7387 | Iface_Typ : Entity_Id; | |
7388 | Prim_Id : Entity_Id; | |
7389 | Prim_Param : Node_Id; | |
7390 | Prim_Typ : Entity_Id; | |
7391 | ||
42f11e4c AC |
7392 | -- Start of processing for Matches_Prefixed_View_Profile |
7393 | ||
7394 | begin | |
7395 | Iface_Param := First (Iface_Params); | |
7396 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
7397 | ||
7398 | if Is_Access_Type (Iface_Typ) then | |
7399 | Iface_Typ := Designated_Type (Iface_Typ); | |
7400 | end if; | |
7401 | ||
7402 | Prim_Param := First (Prim_Params); | |
7403 | ||
bac5ba15 AC |
7404 | -- The first parameter of the potentially overridden subprogram must |
7405 | -- be an interface implemented by Prim. | |
42f11e4c AC |
7406 | |
7407 | if not Is_Interface (Iface_Typ) | |
7408 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
7409 | then | |
7410 | return False; | |
7411 | end if; | |
7412 | ||
ca90b962 GD |
7413 | -- The checks on the object parameters are done, so move on to the |
7414 | -- rest of the parameters. | |
42f11e4c AC |
7415 | |
7416 | if not In_Scope then | |
7417 | Prim_Param := Next (Prim_Param); | |
7418 | end if; | |
7419 | ||
7420 | Iface_Param := Next (Iface_Param); | |
7421 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
7422 | Iface_Id := Defining_Identifier (Iface_Param); | |
7423 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
7424 | ||
7425 | Prim_Id := Defining_Identifier (Prim_Param); | |
7426 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
7427 | ||
7428 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type | |
7429 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
7430 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
7431 | then | |
7432 | Iface_Typ := Designated_Type (Iface_Typ); | |
bac5ba15 | 7433 | Prim_Typ := Designated_Type (Prim_Typ); |
42f11e4c AC |
7434 | end if; |
7435 | ||
7436 | -- Case of multiple interface types inside a parameter profile | |
7437 | ||
7438 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
7439 | ||
bac5ba15 AC |
7440 | -- If the interface type is implemented, then the matching type in |
7441 | -- the primitive should be the implementing record type. | |
42f11e4c AC |
7442 | |
7443 | if Ekind (Iface_Typ) = E_Record_Type | |
7444 | and then Is_Interface (Iface_Typ) | |
7445 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
7446 | then | |
7447 | if Prim_Typ /= Typ then | |
7448 | return False; | |
7449 | end if; | |
7450 | ||
7451 | -- The two parameters must be both mode and subtype conformant | |
7452 | ||
7453 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
7454 | or else not | |
7455 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
7456 | then | |
7457 | return False; | |
7458 | end if; | |
7459 | ||
7460 | Next (Iface_Param); | |
7461 | Next (Prim_Param); | |
7462 | end loop; | |
7463 | ||
7464 | -- One of the two lists contains more parameters than the other | |
7465 | ||
7466 | if Present (Iface_Param) or else Present (Prim_Param) then | |
7467 | return False; | |
7468 | end if; | |
7469 | ||
7470 | return True; | |
7471 | end Matches_Prefixed_View_Profile; | |
7472 | ||
7473 | -- Start of processing for Check_Synchronized_Overriding | |
7474 | ||
7475 | begin | |
7476 | Overridden_Subp := Empty; | |
7477 | ||
7478 | -- Def_Id must be an entry or a subprogram. We should skip predefined | |
ca90b962 | 7479 | -- primitives internally generated by the front end; however at this |
42f11e4c AC |
7480 | -- stage predefined primitives are still not fully decorated. As a |
7481 | -- minor optimization we skip here internally generated subprograms. | |
7482 | ||
7483 | if (Ekind (Def_Id) /= E_Entry | |
7484 | and then Ekind (Def_Id) /= E_Function | |
7485 | and then Ekind (Def_Id) /= E_Procedure) | |
7486 | or else not Comes_From_Source (Def_Id) | |
7487 | then | |
7488 | return; | |
7489 | end if; | |
7490 | ||
bac5ba15 AC |
7491 | -- Search for the concurrent declaration since it contains the list of |
7492 | -- all implemented interfaces. In this case, the subprogram is declared | |
7493 | -- within the scope of a protected or a task type. | |
42f11e4c AC |
7494 | |
7495 | if Present (Scope (Def_Id)) | |
7496 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
7497 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
7498 | then | |
7499 | Typ := Scope (Def_Id); | |
7500 | In_Scope := True; | |
7501 | ||
7502 | -- The enclosing scope is not a synchronized type and the subprogram | |
7503 | -- has no formals. | |
7504 | ||
7505 | elsif No (First_Formal (Def_Id)) then | |
7506 | return; | |
7507 | ||
7508 | -- The subprogram has formals and hence it may be a primitive of a | |
7509 | -- concurrent type. | |
7510 | ||
7511 | else | |
7512 | Typ := Etype (First_Formal (Def_Id)); | |
7513 | ||
7514 | if Is_Access_Type (Typ) then | |
7515 | Typ := Directly_Designated_Type (Typ); | |
7516 | end if; | |
7517 | ||
7518 | if Is_Concurrent_Type (Typ) | |
7519 | and then not Is_Generic_Actual_Type (Typ) | |
7520 | then | |
7521 | In_Scope := False; | |
7522 | ||
bac5ba15 AC |
7523 | -- This case occurs when the concurrent type is declared within a |
7524 | -- generic unit. As a result the corresponding record has been built | |
7525 | -- and used as the type of the first formal, we just have to retrieve | |
7526 | -- the corresponding concurrent type. | |
42f11e4c AC |
7527 | |
7528 | elsif Is_Concurrent_Record_Type (Typ) | |
7529 | and then not Is_Class_Wide_Type (Typ) | |
7530 | and then Present (Corresponding_Concurrent_Type (Typ)) | |
7531 | then | |
7532 | Typ := Corresponding_Concurrent_Type (Typ); | |
7533 | In_Scope := False; | |
7534 | ||
7535 | else | |
7536 | return; | |
7537 | end if; | |
7538 | end if; | |
7539 | ||
ca90b962 GD |
7540 | -- There is no overriding to check if this is an inherited operation in |
7541 | -- a type derivation for a generic actual. | |
42f11e4c AC |
7542 | |
7543 | Collect_Interfaces (Typ, Ifaces_List); | |
7544 | ||
7545 | if Is_Empty_Elmt_List (Ifaces_List) then | |
7546 | return; | |
7547 | end if; | |
7548 | ||
7549 | -- Determine whether entry or subprogram Def_Id overrides a primitive | |
7550 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
7551 | ||
7552 | declare | |
7553 | Candidate : Entity_Id := Empty; | |
7554 | Hom : Entity_Id := Empty; | |
7555 | Subp : Entity_Id := Empty; | |
7556 | ||
7557 | begin | |
bac5ba15 AC |
7558 | -- Traverse the homonym chain, looking for a potentially overridden |
7559 | -- subprogram that belongs to an implemented interface. | |
42f11e4c AC |
7560 | |
7561 | Hom := Current_Entity_In_Scope (Def_Id); | |
7562 | while Present (Hom) loop | |
7563 | Subp := Hom; | |
7564 | ||
7565 | if Subp = Def_Id | |
7566 | or else not Is_Overloadable (Subp) | |
7567 | or else not Is_Primitive (Subp) | |
7568 | or else not Is_Dispatching_Operation (Subp) | |
7569 | or else not Present (Find_Dispatching_Type (Subp)) | |
7570 | or else not Is_Interface (Find_Dispatching_Type (Subp)) | |
7571 | then | |
7572 | null; | |
7573 | ||
bac5ba15 AC |
7574 | -- Entries and procedures can override abstract or null interface |
7575 | -- procedures. | |
42f11e4c | 7576 | |
bac5ba15 | 7577 | elsif Ekind_In (Def_Id, E_Entry, E_Procedure) |
42f11e4c AC |
7578 | and then Ekind (Subp) = E_Procedure |
7579 | and then Matches_Prefixed_View_Profile | |
7580 | (Parameter_Specifications (Parent (Def_Id)), | |
7581 | Parameter_Specifications (Parent (Subp))) | |
7582 | then | |
7583 | Candidate := Subp; | |
7584 | ||
7585 | -- For an overridden subprogram Subp, check whether the mode | |
bac5ba15 AC |
7586 | -- of its first parameter is correct depending on the kind of |
7587 | -- synchronized type. | |
42f11e4c AC |
7588 | |
7589 | declare | |
7590 | Formal : constant Node_Id := First_Formal (Candidate); | |
7591 | ||
7592 | begin | |
7593 | -- In order for an entry or a protected procedure to | |
bac5ba15 | 7594 | -- override, the first parameter of the overridden routine |
ca90b962 | 7595 | -- must be of mode "out", "in out", or access-to-variable. |
42f11e4c AC |
7596 | |
7597 | if Ekind_In (Candidate, E_Entry, E_Procedure) | |
7598 | and then Is_Protected_Type (Typ) | |
432c8cdd | 7599 | and then not Is_Valid_Formal (Formal) |
42f11e4c AC |
7600 | then |
7601 | null; | |
7602 | ||
bac5ba15 AC |
7603 | -- All other cases are OK since a task entry or routine does |
7604 | -- not have a restriction on the mode of the first parameter | |
7605 | -- of the overridden interface routine. | |
42f11e4c AC |
7606 | |
7607 | else | |
7608 | Overridden_Subp := Candidate; | |
7609 | return; | |
7610 | end if; | |
7611 | end; | |
7612 | ||
92a68a04 HK |
7613 | -- Functions can override abstract interface functions. Return |
7614 | -- types must be subtype conformant. | |
42f11e4c AC |
7615 | |
7616 | elsif Ekind (Def_Id) = E_Function | |
7617 | and then Ekind (Subp) = E_Function | |
7618 | and then Matches_Prefixed_View_Profile | |
7619 | (Parameter_Specifications (Parent (Def_Id)), | |
7620 | Parameter_Specifications (Parent (Subp))) | |
92a68a04 HK |
7621 | and then Conforming_Types |
7622 | (Etype (Def_Id), Etype (Subp), Subtype_Conformant) | |
42f11e4c AC |
7623 | then |
7624 | Candidate := Subp; | |
7625 | ||
7626 | -- If an inherited subprogram is implemented by a protected | |
7627 | -- function, then the first parameter of the inherited | |
bac5ba15 | 7628 | -- subprogram shall be of mode in, but not an access-to- |
ca90b962 | 7629 | -- variable parameter (RM 9.4(11/9)). |
42f11e4c AC |
7630 | |
7631 | if Present (First_Formal (Subp)) | |
7632 | and then Ekind (First_Formal (Subp)) = E_In_Parameter | |
7633 | and then | |
7634 | (not Is_Access_Type (Etype (First_Formal (Subp))) | |
7635 | or else | |
7636 | Is_Access_Constant (Etype (First_Formal (Subp)))) | |
7637 | then | |
7638 | Overridden_Subp := Subp; | |
7639 | return; | |
7640 | end if; | |
7641 | end if; | |
7642 | ||
7643 | Hom := Homonym (Hom); | |
7644 | end loop; | |
7645 | ||
7646 | -- After examining all candidates for overriding, we are left with | |
ca90b962 | 7647 | -- the best match, which is a mode-incompatible interface routine. |
42f11e4c AC |
7648 | |
7649 | if In_Scope and then Present (Candidate) then | |
7650 | Error_Msg_PT (Def_Id, Candidate); | |
7651 | end if; | |
7652 | ||
7653 | Overridden_Subp := Candidate; | |
7654 | return; | |
7655 | end; | |
7656 | end Check_Synchronized_Overriding; | |
7657 | ||
996ae0b0 RK |
7658 | --------------------------- |
7659 | -- Check_Type_Conformant -- | |
7660 | --------------------------- | |
7661 | ||
7662 | procedure Check_Type_Conformant | |
7663 | (New_Id : Entity_Id; | |
7664 | Old_Id : Entity_Id; | |
7665 | Err_Loc : Node_Id := Empty) | |
7666 | is | |
7667 | Result : Boolean; | |
81db9d77 | 7668 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7669 | begin |
7670 | Check_Conformance | |
7671 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
7672 | end Check_Type_Conformant; | |
7673 | ||
806f6d37 AC |
7674 | --------------------------- |
7675 | -- Can_Override_Operator -- | |
7676 | --------------------------- | |
7677 | ||
7678 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
7679 | Typ : Entity_Id; | |
f146302c | 7680 | |
806f6d37 AC |
7681 | begin |
7682 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
7683 | return False; | |
7684 | ||
7685 | else | |
7686 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
7687 | ||
f146302c AC |
7688 | -- Check explicitly that the operation is a primitive of the type |
7689 | ||
806f6d37 | 7690 | return Operator_Matches_Spec (Subp, Subp) |
f146302c | 7691 | and then not Is_Generic_Type (Typ) |
806f6d37 AC |
7692 | and then Scope (Subp) = Scope (Typ) |
7693 | and then not Is_Class_Wide_Type (Typ); | |
7694 | end if; | |
7695 | end Can_Override_Operator; | |
7696 | ||
996ae0b0 RK |
7697 | ---------------------- |
7698 | -- Conforming_Types -- | |
7699 | ---------------------- | |
7700 | ||
7701 | function Conforming_Types | |
7702 | (T1 : Entity_Id; | |
7703 | T2 : Entity_Id; | |
7704 | Ctype : Conformance_Type; | |
d05ef0ab | 7705 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 | 7706 | is |
0310af44 AC |
7707 | function Base_Types_Match |
7708 | (Typ_1 : Entity_Id; | |
7709 | Typ_2 : Entity_Id) return Boolean; | |
7710 | -- If neither Typ_1 nor Typ_2 are generic actual types, or if they are | |
7711 | -- in different scopes (e.g. parent and child instances), then verify | |
7712 | -- that the base types are equal. Otherwise Typ_1 and Typ_2 must be on | |
7713 | -- the same subtype chain. The whole purpose of this procedure is to | |
7714 | -- prevent spurious ambiguities in an instantiation that may arise if | |
7715 | -- two distinct generic types are instantiated with the same actual. | |
7716 | ||
7717 | function Find_Designated_Type (Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
7718 | -- An access parameter can designate an incomplete type. If the |
7719 | -- incomplete type is the limited view of a type from a limited_ | |
0310af44 AC |
7720 | -- with_clause, check whether the non-limited view is available. |
7721 | -- If it is a (non-limited) incomplete type, get the full view. | |
7722 | ||
7723 | function Matches_Limited_With_View | |
7724 | (Typ_1 : Entity_Id; | |
7725 | Typ_2 : Entity_Id) return Boolean; | |
7726 | -- Returns True if and only if either Typ_1 denotes a limited view of | |
7727 | -- Typ_2 or Typ_2 denotes a limited view of Typ_1. This can arise when | |
7728 | -- the limited with view of a type is used in a subprogram declaration | |
7729 | -- and the subprogram body is in the scope of a regular with clause for | |
7730 | -- the same unit. In such a case, the two type entities are considered | |
0a36105d | 7731 | -- identical for purposes of conformance checking. |
996ae0b0 RK |
7732 | |
7733 | ---------------------- | |
7734 | -- Base_Types_Match -- | |
7735 | ---------------------- | |
7736 | ||
0310af44 AC |
7737 | function Base_Types_Match |
7738 | (Typ_1 : Entity_Id; | |
7739 | Typ_2 : Entity_Id) return Boolean | |
7740 | is | |
7741 | Base_1 : constant Entity_Id := Base_Type (Typ_1); | |
7742 | Base_2 : constant Entity_Id := Base_Type (Typ_2); | |
8fde064e | 7743 | |
996ae0b0 | 7744 | begin |
0310af44 | 7745 | if Typ_1 = Typ_2 then |
996ae0b0 RK |
7746 | return True; |
7747 | ||
0310af44 | 7748 | elsif Base_1 = Base_2 then |
996ae0b0 | 7749 | |
0a36105d | 7750 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
7751 | -- check that the generic actual is an ancestor subtype of the |
7752 | -- other ???. | |
586ecbf3 | 7753 | |
70f4ad20 AC |
7754 | -- See code in Find_Corresponding_Spec that applies an additional |
7755 | -- filter to handle accidental amiguities in instances. | |
996ae0b0 | 7756 | |
0310af44 AC |
7757 | return |
7758 | not Is_Generic_Actual_Type (Typ_1) | |
7759 | or else not Is_Generic_Actual_Type (Typ_2) | |
7760 | or else Scope (Typ_1) /= Scope (Typ_2); | |
996ae0b0 | 7761 | |
0310af44 | 7762 | -- If Typ_2 is a generic actual type it is declared as the subtype of |
2995860f AC |
7763 | -- the actual. If that actual is itself a subtype we need to use its |
7764 | -- own base type to check for compatibility. | |
8fde064e | 7765 | |
0310af44 AC |
7766 | elsif Ekind (Base_2) = Ekind (Typ_2) |
7767 | and then Base_1 = Base_Type (Base_2) | |
7768 | then | |
8fde064e AC |
7769 | return True; |
7770 | ||
0310af44 AC |
7771 | elsif Ekind (Base_1) = Ekind (Typ_1) |
7772 | and then Base_2 = Base_Type (Base_1) | |
7773 | then | |
8fde064e AC |
7774 | return True; |
7775 | ||
0a36105d JM |
7776 | else |
7777 | return False; | |
7778 | end if; | |
7779 | end Base_Types_Match; | |
aa720a54 | 7780 | |
5d37ba92 ES |
7781 | -------------------------- |
7782 | -- Find_Designated_Type -- | |
7783 | -------------------------- | |
7784 | ||
0310af44 | 7785 | function Find_Designated_Type (Typ : Entity_Id) return Entity_Id is |
5d37ba92 ES |
7786 | Desig : Entity_Id; |
7787 | ||
7788 | begin | |
0310af44 | 7789 | Desig := Directly_Designated_Type (Typ); |
5d37ba92 ES |
7790 | |
7791 | if Ekind (Desig) = E_Incomplete_Type then | |
7792 | ||
7793 | -- If regular incomplete type, get full view if available | |
7794 | ||
7795 | if Present (Full_View (Desig)) then | |
7796 | Desig := Full_View (Desig); | |
7797 | ||
7798 | -- If limited view of a type, get non-limited view if available, | |
7799 | -- and check again for a regular incomplete type. | |
7800 | ||
7801 | elsif Present (Non_Limited_View (Desig)) then | |
7802 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
7803 | end if; | |
7804 | end if; | |
7805 | ||
7806 | return Desig; | |
7807 | end Find_Designated_Type; | |
7808 | ||
0a36105d JM |
7809 | ------------------------------- |
7810 | -- Matches_Limited_With_View -- | |
7811 | ------------------------------- | |
7812 | ||
0310af44 AC |
7813 | function Matches_Limited_With_View |
7814 | (Typ_1 : Entity_Id; | |
7815 | Typ_2 : Entity_Id) return Boolean | |
7816 | is | |
7817 | function Is_Matching_Limited_View | |
7818 | (Typ : Entity_Id; | |
7819 | View : Entity_Id) return Boolean; | |
7820 | -- Determine whether non-limited view View denotes type Typ in some | |
7821 | -- conformant fashion. | |
7822 | ||
7823 | ------------------------------ | |
7824 | -- Is_Matching_Limited_View -- | |
7825 | ------------------------------ | |
7826 | ||
7827 | function Is_Matching_Limited_View | |
7828 | (Typ : Entity_Id; | |
7829 | View : Entity_Id) return Boolean | |
7830 | is | |
7831 | Root_Typ : Entity_Id; | |
7832 | Root_View : Entity_Id; | |
7833 | ||
7834 | begin | |
7835 | -- The non-limited view directly denotes the type | |
7836 | ||
7837 | if Typ = View then | |
7838 | return True; | |
7839 | ||
7840 | -- The type is a subtype of the non-limited view | |
7841 | ||
7842 | elsif Is_Subtype_Of (Typ, View) then | |
7843 | return True; | |
7844 | ||
7845 | -- Both the non-limited view and the type denote class-wide types | |
7846 | ||
7847 | elsif Is_Class_Wide_Type (Typ) | |
7848 | and then Is_Class_Wide_Type (View) | |
7849 | then | |
7850 | Root_Typ := Root_Type (Typ); | |
7851 | Root_View := Root_Type (View); | |
7852 | ||
7853 | if Root_Typ = Root_View then | |
7854 | return True; | |
7855 | ||
7856 | -- An incomplete tagged type and its full view may receive two | |
7857 | -- distinct class-wide types when the related package has not | |
7858 | -- been analyzed yet. | |
7859 | ||
7860 | -- package Pack is | |
7861 | -- type T is tagged; -- CW_1 | |
7862 | -- type T is tagged null record; -- CW_2 | |
7863 | -- end Pack; | |
7864 | ||
7865 | -- This is because the package lacks any semantic information | |
7866 | -- that may eventually link both views of T. As a consequence, | |
7867 | -- a client of the limited view of Pack will see CW_2 while a | |
7868 | -- client of the non-limited view of Pack will see CW_1. | |
7869 | ||
7870 | elsif Is_Incomplete_Type (Root_Typ) | |
7871 | and then Present (Full_View (Root_Typ)) | |
7872 | and then Full_View (Root_Typ) = Root_View | |
7873 | then | |
7874 | return True; | |
7875 | ||
7876 | elsif Is_Incomplete_Type (Root_View) | |
7877 | and then Present (Full_View (Root_View)) | |
7878 | and then Full_View (Root_View) = Root_Typ | |
7879 | then | |
7880 | return True; | |
7881 | end if; | |
7882 | end if; | |
7883 | ||
7884 | return False; | |
7885 | end Is_Matching_Limited_View; | |
7886 | ||
7887 | -- Start of processing for Matches_Limited_With_View | |
7888 | ||
0a36105d JM |
7889 | begin |
7890 | -- In some cases a type imported through a limited_with clause, and | |
0310af44 | 7891 | -- its non-limited view are both visible, for example in an anonymous |
28fa5430 AC |
7892 | -- access-to-class-wide type in a formal, or when building the body |
7893 | -- for a subprogram renaming after the subprogram has been frozen. | |
0310af44 | 7894 | -- In these cases both entities designate the same type. In addition, |
28fa5430 AC |
7895 | -- if one of them is an actual in an instance, it may be a subtype of |
7896 | -- the non-limited view of the other. | |
7897 | ||
0310af44 AC |
7898 | if From_Limited_With (Typ_1) |
7899 | and then From_Limited_With (Typ_2) | |
7900 | and then Available_View (Typ_1) = Available_View (Typ_2) | |
28fa5430 | 7901 | then |
aa720a54 AC |
7902 | return True; |
7903 | ||
0310af44 AC |
7904 | elsif From_Limited_With (Typ_1) then |
7905 | return Is_Matching_Limited_View (Typ_2, Available_View (Typ_1)); | |
3e24afaa | 7906 | |
0310af44 AC |
7907 | elsif From_Limited_With (Typ_2) then |
7908 | return Is_Matching_Limited_View (Typ_1, Available_View (Typ_2)); | |
41251c60 | 7909 | |
996ae0b0 RK |
7910 | else |
7911 | return False; | |
7912 | end if; | |
0a36105d | 7913 | end Matches_Limited_With_View; |
996ae0b0 | 7914 | |
0310af44 AC |
7915 | -- Local variables |
7916 | ||
7917 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; | |
7918 | ||
7919 | Type_1 : Entity_Id := T1; | |
7920 | Type_2 : Entity_Id := T2; | |
7921 | ||
ec4867fa | 7922 | -- Start of processing for Conforming_Types |
758c442c | 7923 | |
996ae0b0 | 7924 | begin |
8fde064e AC |
7925 | -- The context is an instance association for a formal access-to- |
7926 | -- subprogram type; the formal parameter types require mapping because | |
7927 | -- they may denote other formal parameters of the generic unit. | |
996ae0b0 RK |
7928 | |
7929 | if Get_Inst then | |
7930 | Type_1 := Get_Instance_Of (T1); | |
7931 | Type_2 := Get_Instance_Of (T2); | |
7932 | end if; | |
7933 | ||
0a36105d JM |
7934 | -- If one of the types is a view of the other introduced by a limited |
7935 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 7936 | |
0a36105d JM |
7937 | if Matches_Limited_With_View (T1, T2) then |
7938 | return True; | |
7939 | ||
7940 | elsif Base_Types_Match (Type_1, Type_2) then | |
7738270b AC |
7941 | if Ctype <= Mode_Conformant then |
7942 | return True; | |
7943 | ||
7944 | else | |
7945 | return | |
7946 | Subtypes_Statically_Match (Type_1, Type_2) | |
7947 | and then Dimensions_Match (Type_1, Type_2); | |
7948 | end if; | |
996ae0b0 RK |
7949 | |
7950 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
7951 | and then Present (Full_View (Type_1)) | |
7952 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
7953 | then | |
7738270b AC |
7954 | return |
7955 | Ctype <= Mode_Conformant | |
7956 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
996ae0b0 RK |
7957 | |
7958 | elsif Ekind (Type_2) = E_Incomplete_Type | |
7959 | and then Present (Full_View (Type_2)) | |
7960 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7961 | then | |
7738270b AC |
7962 | return |
7963 | Ctype <= Mode_Conformant | |
7964 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
7965 | |
7966 | elsif Is_Private_Type (Type_2) | |
7967 | and then In_Instance | |
7968 | and then Present (Full_View (Type_2)) | |
7969 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7970 | then | |
7738270b AC |
7971 | return |
7972 | Ctype <= Mode_Conformant | |
7973 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
167b47d9 | 7974 | |
7727a9c1 AC |
7975 | -- Another confusion between views in a nested instance with an |
7976 | -- actual private type whose full view is not in scope. | |
7977 | ||
7978 | elsif Ekind (Type_2) = E_Private_Subtype | |
7979 | and then In_Instance | |
7980 | and then Etype (Type_2) = Type_1 | |
7981 | then | |
7982 | return True; | |
7983 | ||
088c7e1b | 7984 | -- In Ada 2012, incomplete types (including limited views) can appear |
5b85ad7d PMR |
7985 | -- as actuals in instantiations, where they are conformant to the |
7986 | -- corresponding incomplete formal. | |
167b47d9 AC |
7987 | |
7988 | elsif Is_Incomplete_Type (Type_1) | |
7989 | and then Is_Incomplete_Type (Type_2) | |
5b85ad7d | 7990 | and then In_Instance |
167b47d9 AC |
7991 | and then (Used_As_Generic_Actual (Type_1) |
7992 | or else Used_As_Generic_Actual (Type_2)) | |
7993 | then | |
7994 | return True; | |
996ae0b0 RK |
7995 | end if; |
7996 | ||
0a36105d | 7997 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
466c2127 AC |
7998 | -- treated recursively because they carry a signature. As far as |
7999 | -- conformance is concerned, convention plays no role, and either | |
8000 | -- or both could be access to protected subprograms. | |
af4b9434 AC |
8001 | |
8002 | Are_Anonymous_Access_To_Subprogram_Types := | |
466c2127 AC |
8003 | Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
8004 | E_Anonymous_Access_Protected_Subprogram_Type) | |
f937473f | 8005 | and then |
466c2127 AC |
8006 | Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
8007 | E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 8008 | |
996ae0b0 | 8009 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
8010 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
8011 | -- the base types because we may have built internal subtype entities | |
8012 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 8013 | |
5d37ba92 ES |
8014 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
8015 | and then | |
8016 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
8fde064e AC |
8017 | |
8018 | -- Ada 2005 (AI-254) | |
8019 | ||
8020 | or else Are_Anonymous_Access_To_Subprogram_Types | |
996ae0b0 RK |
8021 | then |
8022 | declare | |
8023 | Desig_1 : Entity_Id; | |
8024 | Desig_2 : Entity_Id; | |
8025 | ||
8026 | begin | |
885c4871 | 8027 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 8028 | -- subtype conformance. |
9dcb52e1 | 8029 | |
0791fbe9 | 8030 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
8031 | and then Ctype >= Subtype_Conformant |
8032 | and then | |
8033 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
8034 | then | |
8035 | return False; | |
996ae0b0 RK |
8036 | end if; |
8037 | ||
5d37ba92 | 8038 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 8039 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 8040 | |
5d37ba92 | 8041 | -- If the context is an instance association for a formal |
82c80734 RD |
8042 | -- access-to-subprogram type; formal access parameter designated |
8043 | -- types require mapping because they may denote other formal | |
8044 | -- parameters of the generic unit. | |
996ae0b0 RK |
8045 | |
8046 | if Get_Inst then | |
8047 | Desig_1 := Get_Instance_Of (Desig_1); | |
8048 | Desig_2 := Get_Instance_Of (Desig_2); | |
8049 | end if; | |
8050 | ||
82c80734 RD |
8051 | -- It is possible for a Class_Wide_Type to be introduced for an |
8052 | -- incomplete type, in which case there is a separate class_ wide | |
8053 | -- type for the full view. The types conform if their Etypes | |
8054 | -- conform, i.e. one may be the full view of the other. This can | |
8055 | -- only happen in the context of an access parameter, other uses | |
8056 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 8057 | |
fbf5a39b | 8058 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
8059 | and then |
8060 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
8061 | then |
8062 | return | |
fbf5a39b AC |
8063 | Conforming_Types |
8064 | (Etype (Base_Type (Desig_1)), | |
8065 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
8066 | |
8067 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 8068 | if Ada_Version < Ada_2005 then |
7738270b AC |
8069 | return |
8070 | Ctype = Type_Conformant | |
8071 | or else Subtypes_Statically_Match (Desig_1, Desig_2); | |
af4b9434 | 8072 | |
758c442c GD |
8073 | -- We must check the conformance of the signatures themselves |
8074 | ||
8075 | else | |
8076 | declare | |
8077 | Conformant : Boolean; | |
8078 | begin | |
8079 | Check_Conformance | |
8080 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
8081 | return Conformant; | |
8082 | end; | |
8083 | end if; | |
8084 | ||
167b47d9 AC |
8085 | -- A limited view of an actual matches the corresponding |
8086 | -- incomplete formal. | |
8087 | ||
8088 | elsif Ekind (Desig_2) = E_Incomplete_Subtype | |
8089 | and then From_Limited_With (Desig_2) | |
8090 | and then Used_As_Generic_Actual (Etype (Desig_2)) | |
8091 | then | |
8092 | return True; | |
8093 | ||
996ae0b0 RK |
8094 | else |
8095 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
8096 | and then (Ctype = Type_Conformant | |
8fde064e AC |
8097 | or else |
8098 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
8099 | end if; |
8100 | end; | |
8101 | ||
8102 | -- Otherwise definitely no match | |
8103 | ||
8104 | else | |
c8ef728f ES |
8105 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
8106 | and then Is_Access_Type (Type_2)) | |
8107 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
8fde064e | 8108 | and then Is_Access_Type (Type_1))) |
c8ef728f ES |
8109 | and then |
8110 | Conforming_Types | |
8111 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
8112 | then | |
8113 | May_Hide_Profile := True; | |
8114 | end if; | |
8115 | ||
996ae0b0 RK |
8116 | return False; |
8117 | end if; | |
996ae0b0 RK |
8118 | end Conforming_Types; |
8119 | ||
8120 | -------------------------- | |
8121 | -- Create_Extra_Formals -- | |
8122 | -------------------------- | |
8123 | ||
8124 | procedure Create_Extra_Formals (E : Entity_Id) is | |
ec4867fa | 8125 | First_Extra : Entity_Id := Empty; |
8eb8461d AC |
8126 | Formal : Entity_Id; |
8127 | Last_Extra : Entity_Id := Empty; | |
996ae0b0 | 8128 | |
ec4867fa ES |
8129 | function Add_Extra_Formal |
8130 | (Assoc_Entity : Entity_Id; | |
8131 | Typ : Entity_Id; | |
8132 | Scope : Entity_Id; | |
8133 | Suffix : String) return Entity_Id; | |
8134 | -- Add an extra formal to the current list of formals and extra formals. | |
8135 | -- The extra formal is added to the end of the list of extra formals, | |
8136 | -- and also returned as the result. These formals are always of mode IN. | |
8137 | -- The new formal has the type Typ, is declared in Scope, and its name | |
8138 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
8139 | -- The following suffixes are currently used. They should not be changed |
8140 | -- without coordinating with CodePeer, which makes use of these to | |
8141 | -- provide better messages. | |
8142 | ||
d92eccc3 AC |
8143 | -- O denotes the Constrained bit. |
8144 | -- L denotes the accessibility level. | |
cd5a9750 AC |
8145 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
8146 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 8147 | |
fbf5a39b AC |
8148 | ---------------------- |
8149 | -- Add_Extra_Formal -- | |
8150 | ---------------------- | |
8151 | ||
ec4867fa ES |
8152 | function Add_Extra_Formal |
8153 | (Assoc_Entity : Entity_Id; | |
8154 | Typ : Entity_Id; | |
8155 | Scope : Entity_Id; | |
8156 | Suffix : String) return Entity_Id | |
8157 | is | |
996ae0b0 | 8158 | EF : constant Entity_Id := |
ec4867fa ES |
8159 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
8160 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 8161 | Suffix => Suffix)); |
996ae0b0 RK |
8162 | |
8163 | begin | |
82c80734 RD |
8164 | -- A little optimization. Never generate an extra formal for the |
8165 | -- _init operand of an initialization procedure, since it could | |
8166 | -- never be used. | |
996ae0b0 RK |
8167 | |
8168 | if Chars (Formal) = Name_uInit then | |
8169 | return Empty; | |
8170 | end if; | |
8171 | ||
8172 | Set_Ekind (EF, E_In_Parameter); | |
8173 | Set_Actual_Subtype (EF, Typ); | |
8174 | Set_Etype (EF, Typ); | |
ec4867fa | 8175 | Set_Scope (EF, Scope); |
996ae0b0 RK |
8176 | Set_Mechanism (EF, Default_Mechanism); |
8177 | Set_Formal_Validity (EF); | |
8178 | ||
ec4867fa ES |
8179 | if No (First_Extra) then |
8180 | First_Extra := EF; | |
d00301ec | 8181 | Set_Extra_Formals (Scope, EF); |
ec4867fa ES |
8182 | end if; |
8183 | ||
8184 | if Present (Last_Extra) then | |
8185 | Set_Extra_Formal (Last_Extra, EF); | |
8186 | end if; | |
8187 | ||
996ae0b0 | 8188 | Last_Extra := EF; |
ec4867fa | 8189 | |
996ae0b0 RK |
8190 | return EF; |
8191 | end Add_Extra_Formal; | |
8192 | ||
8eb8461d AC |
8193 | -- Local variables |
8194 | ||
8195 | Formal_Type : Entity_Id; | |
8196 | P_Formal : Entity_Id := Empty; | |
8197 | ||
996ae0b0 RK |
8198 | -- Start of processing for Create_Extra_Formals |
8199 | ||
8200 | begin | |
8fde064e AC |
8201 | -- We never generate extra formals if expansion is not active because we |
8202 | -- don't need them unless we are generating code. | |
f937473f RD |
8203 | |
8204 | if not Expander_Active then | |
8205 | return; | |
8206 | end if; | |
8207 | ||
e2441021 AC |
8208 | -- No need to generate extra formals in interface thunks whose target |
8209 | -- primitive has no extra formals. | |
8210 | ||
8211 | if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then | |
8212 | return; | |
8213 | end if; | |
8214 | ||
82c80734 | 8215 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 8216 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 8217 | -- for extra formals. |
996ae0b0 RK |
8218 | |
8219 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
8220 | P_Formal := First_Formal (Alias (E)); | |
8221 | end if; | |
8222 | ||
996ae0b0 RK |
8223 | Formal := First_Formal (E); |
8224 | while Present (Formal) loop | |
8225 | Last_Extra := Formal; | |
8226 | Next_Formal (Formal); | |
8227 | end loop; | |
8228 | ||
03a72cd3 | 8229 | -- If Extra_Formals were already created, don't do it again. This |
82c80734 | 8230 | -- situation may arise for subprogram types created as part of |
d00301ec | 8231 | -- dispatching calls (see Expand_Dispatching_Call). |
996ae0b0 | 8232 | |
8fde064e | 8233 | if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
996ae0b0 RK |
8234 | return; |
8235 | end if; | |
8236 | ||
19590d70 GD |
8237 | -- If the subprogram is a predefined dispatching subprogram then don't |
8238 | -- generate any extra constrained or accessibility level formals. In | |
8239 | -- general we suppress these for internal subprograms (by not calling | |
8240 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
8241 | -- generated stream attributes do get passed through because extra | |
8242 | -- build-in-place formals are needed in some cases (limited 'Input). | |
8243 | ||
bac7206d | 8244 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 8245 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
8246 | end if; |
8247 | ||
996ae0b0 | 8248 | Formal := First_Formal (E); |
996ae0b0 RK |
8249 | while Present (Formal) loop |
8250 | ||
8251 | -- Create extra formal for supporting the attribute 'Constrained. | |
8252 | -- The case of a private type view without discriminants also | |
8253 | -- requires the extra formal if the underlying type has defaulted | |
8254 | -- discriminants. | |
8255 | ||
8256 | if Ekind (Formal) /= E_In_Parameter then | |
8257 | if Present (P_Formal) then | |
8258 | Formal_Type := Etype (P_Formal); | |
8259 | else | |
8260 | Formal_Type := Etype (Formal); | |
8261 | end if; | |
8262 | ||
5d09245e AC |
8263 | -- Do not produce extra formals for Unchecked_Union parameters. |
8264 | -- Jump directly to the end of the loop. | |
8265 | ||
8266 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
8267 | goto Skip_Extra_Formal_Generation; | |
8268 | end if; | |
8269 | ||
996ae0b0 RK |
8270 | if not Has_Discriminants (Formal_Type) |
8271 | and then Ekind (Formal_Type) in Private_Kind | |
8272 | and then Present (Underlying_Type (Formal_Type)) | |
8273 | then | |
8274 | Formal_Type := Underlying_Type (Formal_Type); | |
8275 | end if; | |
8276 | ||
5e5db3b4 GD |
8277 | -- Suppress the extra formal if formal's subtype is constrained or |
8278 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
8279 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
8280 | -- can have defaulted discriminants, but 'Constrained is required | |
8281 | -- to return True, so the formal is never needed (see AI05-0214). | |
8282 | -- Note that this ensures consistency of calling sequences for | |
8283 | -- dispatching operations when some types in a class have defaults | |
8284 | -- on discriminants and others do not (and requiring the extra | |
8285 | -- formal would introduce distributed overhead). | |
8286 | ||
b5bdffcc AC |
8287 | -- If the type does not have a completion yet, treat as prior to |
8288 | -- Ada 2012 for consistency. | |
8289 | ||
996ae0b0 | 8290 | if Has_Discriminants (Formal_Type) |
f937473f | 8291 | and then not Is_Constrained (Formal_Type) |
83496138 | 8292 | and then Is_Definite_Subtype (Formal_Type) |
5e5db3b4 | 8293 | and then (Ada_Version < Ada_2012 |
b5bdffcc AC |
8294 | or else No (Underlying_Type (Formal_Type)) |
8295 | or else not | |
8296 | (Is_Limited_Type (Formal_Type) | |
8297 | and then | |
8298 | (Is_Tagged_Type | |
8299 | (Underlying_Type (Formal_Type))))) | |
996ae0b0 RK |
8300 | then |
8301 | Set_Extra_Constrained | |
d92eccc3 | 8302 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
8303 | end if; |
8304 | end if; | |
8305 | ||
0a36105d JM |
8306 | -- Create extra formal for supporting accessibility checking. This |
8307 | -- is done for both anonymous access formals and formals of named | |
8308 | -- access types that are marked as controlling formals. The latter | |
8309 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
8310 | -- type and substitutes the types of access-to-class-wide actuals | |
8311 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
8312 | -- Base_Type is applied because in cases where there is a null |
8313 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
8314 | |
8315 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 8316 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
8317 | -- package in which it resides. However, we do not suppress it |
8318 | -- simply if the scope has accessibility checks suppressed, since | |
8319 | -- this could cause trouble when clients are compiled with a | |
8320 | -- different suppression setting. The explicit checks at the | |
8321 | -- package level are safe from this point of view. | |
996ae0b0 | 8322 | |
5d37ba92 | 8323 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 8324 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 8325 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 8326 | and then not |
fbf5a39b | 8327 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 8328 | or else |
fbf5a39b | 8329 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 8330 | and then |
c8ef728f | 8331 | (No (P_Formal) |
996ae0b0 RK |
8332 | or else Present (Extra_Accessibility (P_Formal))) |
8333 | then | |
811c6a85 | 8334 | Set_Extra_Accessibility |
d92eccc3 | 8335 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
8336 | end if; |
8337 | ||
5d09245e AC |
8338 | -- This label is required when skipping extra formal generation for |
8339 | -- Unchecked_Union parameters. | |
8340 | ||
8341 | <<Skip_Extra_Formal_Generation>> | |
8342 | ||
f937473f RD |
8343 | if Present (P_Formal) then |
8344 | Next_Formal (P_Formal); | |
8345 | end if; | |
8346 | ||
996ae0b0 RK |
8347 | Next_Formal (Formal); |
8348 | end loop; | |
ec4867fa | 8349 | |
63585f75 SB |
8350 | <<Test_For_Func_Result_Extras>> |
8351 | ||
8352 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
8353 | -- function call is ... determined by the point of call ...". | |
8354 | ||
8355 | if Needs_Result_Accessibility_Level (E) then | |
8356 | Set_Extra_Accessibility_Of_Result | |
8357 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
8358 | end if; | |
19590d70 | 8359 | |
ec4867fa | 8360 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
8361 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
8362 | ||
5168a9b3 | 8363 | if Is_Build_In_Place_Function (E) then |
ec4867fa | 8364 | declare |
f937473f | 8365 | Result_Subt : constant Entity_Id := Etype (E); |
2fcc44fa | 8366 | Formal_Typ : Entity_Id; |
8eb8461d | 8367 | Subp_Decl : Node_Id; |
d00301ec | 8368 | Discard : Entity_Id; |
ec4867fa ES |
8369 | |
8370 | begin | |
f937473f | 8371 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
8372 | -- add a 4-state formal indicating whether the return object is |
8373 | -- allocated by the caller (1), or should be allocated by the | |
8374 | -- callee on the secondary stack (2), in the global heap (3), or | |
8375 | -- in a user-defined storage pool (4). For the moment we just use | |
8376 | -- Natural for the type of this formal. Note that this formal | |
8377 | -- isn't usually needed in the case where the result subtype is | |
8378 | -- constrained, but it is needed when the function has a tagged | |
8379 | -- result, because generally such functions can be called in a | |
8380 | -- dispatching context and such calls must be handled like calls | |
8381 | -- to a class-wide function. | |
0a36105d | 8382 | |
1bb6e262 | 8383 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
8384 | Discard := |
8385 | Add_Extra_Formal | |
8386 | (E, Standard_Natural, | |
8387 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 8388 | |
8417f4b2 | 8389 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 | 8390 | -- use a user-defined pool. This formal is not added on |
535a8637 | 8391 | -- ZFP as those targets do not support pools. |
200b7162 | 8392 | |
535a8637 | 8393 | if RTE_Available (RE_Root_Storage_Pool_Ptr) then |
8417f4b2 AC |
8394 | Discard := |
8395 | Add_Extra_Formal | |
8396 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
8397 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
8398 | end if; | |
f937473f | 8399 | end if; |
ec4867fa | 8400 | |
df3e68b1 | 8401 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 8402 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 8403 | |
ca5af305 | 8404 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
8405 | Discard := |
8406 | Add_Extra_Formal | |
ca5af305 AC |
8407 | (E, RTE (RE_Finalization_Master_Ptr), |
8408 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
8409 | end if; |
8410 | ||
94bbf008 AC |
8411 | -- When the result type contains tasks, add two extra formals: the |
8412 | -- master of the tasks to be created, and the caller's activation | |
8413 | -- chain. | |
f937473f | 8414 | |
1ed19d98 | 8415 | if Needs_BIP_Task_Actuals (E) then |
f937473f RD |
8416 | Discard := |
8417 | Add_Extra_Formal | |
8418 | (E, RTE (RE_Master_Id), | |
af89615f | 8419 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
8420 | Discard := |
8421 | Add_Extra_Formal | |
8422 | (E, RTE (RE_Activation_Chain_Access), | |
8423 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
8424 | end if; | |
ec4867fa | 8425 | |
f937473f RD |
8426 | -- All build-in-place functions get an extra formal that will be |
8427 | -- passed the address of the return object within the caller. | |
ec4867fa | 8428 | |
1a36a0cd AC |
8429 | Formal_Typ := |
8430 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 8431 | |
d00301ec BD |
8432 | -- Incomplete_View_From_Limited_With is needed here because |
8433 | -- gigi gets confused if the designated type is the full view | |
8434 | -- coming from a limited-with'ed package. In the normal case, | |
8435 | -- (no limited with) Incomplete_View_From_Limited_With | |
8436 | -- returns Result_Subt. | |
8437 | ||
8438 | Set_Directly_Designated_Type | |
8439 | (Formal_Typ, Incomplete_View_From_Limited_With (Result_Subt)); | |
1a36a0cd AC |
8440 | Set_Etype (Formal_Typ, Formal_Typ); |
8441 | Set_Depends_On_Private | |
8442 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
8443 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
8444 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 8445 | |
1a36a0cd AC |
8446 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
8447 | -- the designated type comes from the limited view (for back-end | |
8448 | -- purposes). | |
ec4867fa | 8449 | |
7b56a91b AC |
8450 | Set_From_Limited_With |
8451 | (Formal_Typ, From_Limited_With (Result_Subt)); | |
f937473f | 8452 | |
1a36a0cd AC |
8453 | Layout_Type (Formal_Typ); |
8454 | ||
8eb8461d AC |
8455 | -- Force the definition of the Itype in case of internal function |
8456 | -- calls within the same or nested scope. | |
8457 | ||
8458 | if Is_Subprogram_Or_Generic_Subprogram (E) then | |
8459 | Subp_Decl := Parent (E); | |
8460 | ||
8461 | -- The insertion point for an Itype reference should be after | |
8462 | -- the unit declaration node of the subprogram. An exception | |
8463 | -- to this are inherited operations from a parent type in which | |
8464 | -- case the derived type acts as their parent. | |
8465 | ||
8466 | if Nkind_In (Subp_Decl, N_Function_Specification, | |
8467 | N_Procedure_Specification) | |
8468 | then | |
8469 | Subp_Decl := Parent (Subp_Decl); | |
8470 | end if; | |
8471 | ||
8472 | Build_Itype_Reference (Formal_Typ, Subp_Decl); | |
8473 | end if; | |
8474 | ||
1a36a0cd AC |
8475 | Discard := |
8476 | Add_Extra_Formal | |
8477 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
8478 | end; |
8479 | end if; | |
16d92641 PMR |
8480 | |
8481 | -- If this is an instance of a generic, we need to have extra formals | |
8482 | -- for the Alias. | |
8483 | ||
8484 | if Is_Generic_Instance (E) and then Present (Alias (E)) then | |
8485 | Set_Extra_Formals (Alias (E), Extra_Formals (E)); | |
8486 | end if; | |
996ae0b0 RK |
8487 | end Create_Extra_Formals; |
8488 | ||
8489 | ----------------------------- | |
8490 | -- Enter_Overloaded_Entity -- | |
8491 | ----------------------------- | |
8492 | ||
8493 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
51b42ffa AC |
8494 | function Matches_Predefined_Op return Boolean; |
8495 | -- This returns an approximation of whether S matches a predefined | |
8496 | -- operator, based on the operator symbol, and the parameter and result | |
8497 | -- types. The rules are scattered throughout chapter 4 of the Ada RM. | |
8498 | ||
8499 | --------------------------- | |
8500 | -- Matches_Predefined_Op -- | |
8501 | --------------------------- | |
8502 | ||
8503 | function Matches_Predefined_Op return Boolean is | |
8504 | Formal_1 : constant Entity_Id := First_Formal (S); | |
8505 | Formal_2 : constant Entity_Id := Next_Formal (Formal_1); | |
8506 | Op : constant Name_Id := Chars (S); | |
8507 | Result_Type : constant Entity_Id := Base_Type (Etype (S)); | |
8508 | Type_1 : constant Entity_Id := Base_Type (Etype (Formal_1)); | |
8509 | ||
8510 | begin | |
8511 | -- Binary operator | |
8512 | ||
8513 | if Present (Formal_2) then | |
8514 | declare | |
8515 | Type_2 : constant Entity_Id := Base_Type (Etype (Formal_2)); | |
8516 | ||
8517 | begin | |
8518 | -- All but "&" and "**" have same-types parameters | |
8519 | ||
8520 | case Op is | |
d8f43ee6 HK |
8521 | when Name_Op_Concat |
8522 | | Name_Op_Expon | |
8523 | => | |
51b42ffa AC |
8524 | null; |
8525 | ||
8526 | when others => | |
8527 | if Type_1 /= Type_2 then | |
8528 | return False; | |
8529 | end if; | |
8530 | end case; | |
8531 | ||
8532 | -- Check parameter and result types | |
8533 | ||
8534 | case Op is | |
d8f43ee6 HK |
8535 | when Name_Op_And |
8536 | | Name_Op_Or | |
8537 | | Name_Op_Xor | |
8538 | => | |
51b42ffa AC |
8539 | return |
8540 | Is_Boolean_Type (Result_Type) | |
8541 | and then Result_Type = Type_1; | |
8542 | ||
d8f43ee6 HK |
8543 | when Name_Op_Mod |
8544 | | Name_Op_Rem | |
8545 | => | |
51b42ffa AC |
8546 | return |
8547 | Is_Integer_Type (Result_Type) | |
8548 | and then Result_Type = Type_1; | |
8549 | ||
d8f43ee6 HK |
8550 | when Name_Op_Add |
8551 | | Name_Op_Divide | |
8552 | | Name_Op_Multiply | |
8553 | | Name_Op_Subtract | |
8554 | => | |
51b42ffa AC |
8555 | return |
8556 | Is_Numeric_Type (Result_Type) | |
8557 | and then Result_Type = Type_1; | |
8558 | ||
d8f43ee6 HK |
8559 | when Name_Op_Eq |
8560 | | Name_Op_Ne | |
8561 | => | |
51b42ffa AC |
8562 | return |
8563 | Is_Boolean_Type (Result_Type) | |
8564 | and then not Is_Limited_Type (Type_1); | |
8565 | ||
d8f43ee6 HK |
8566 | when Name_Op_Ge |
8567 | | Name_Op_Gt | |
8568 | | Name_Op_Le | |
8569 | | Name_Op_Lt | |
8570 | => | |
51b42ffa AC |
8571 | return |
8572 | Is_Boolean_Type (Result_Type) | |
8573 | and then (Is_Array_Type (Type_1) | |
8574 | or else Is_Scalar_Type (Type_1)); | |
8575 | ||
8576 | when Name_Op_Concat => | |
8577 | return Is_Array_Type (Result_Type); | |
8578 | ||
8579 | when Name_Op_Expon => | |
8580 | return | |
8581 | (Is_Integer_Type (Result_Type) | |
8582 | or else Is_Floating_Point_Type (Result_Type)) | |
8583 | and then Result_Type = Type_1 | |
8584 | and then Type_2 = Standard_Integer; | |
8585 | ||
8586 | when others => | |
8587 | raise Program_Error; | |
8588 | end case; | |
8589 | end; | |
8590 | ||
8591 | -- Unary operator | |
8592 | ||
8593 | else | |
8594 | case Op is | |
d8f43ee6 HK |
8595 | when Name_Op_Abs |
8596 | | Name_Op_Add | |
8597 | | Name_Op_Subtract | |
8598 | => | |
51b42ffa AC |
8599 | return |
8600 | Is_Numeric_Type (Result_Type) | |
8601 | and then Result_Type = Type_1; | |
8602 | ||
8603 | when Name_Op_Not => | |
8604 | return | |
8605 | Is_Boolean_Type (Result_Type) | |
8606 | and then Result_Type = Type_1; | |
8607 | ||
8608 | when others => | |
8609 | raise Program_Error; | |
8610 | end case; | |
8611 | end if; | |
8612 | end Matches_Predefined_Op; | |
8613 | ||
8614 | -- Local variables | |
8615 | ||
996ae0b0 RK |
8616 | E : Entity_Id := Current_Entity_In_Scope (S); |
8617 | C_E : Entity_Id := Current_Entity (S); | |
8618 | ||
51b42ffa AC |
8619 | -- Start of processing for Enter_Overloaded_Entity |
8620 | ||
996ae0b0 RK |
8621 | begin |
8622 | if Present (E) then | |
8623 | Set_Has_Homonym (E); | |
8624 | Set_Has_Homonym (S); | |
8625 | end if; | |
8626 | ||
8627 | Set_Is_Immediately_Visible (S); | |
8628 | Set_Scope (S, Current_Scope); | |
8629 | ||
8630 | -- Chain new entity if front of homonym in current scope, so that | |
8631 | -- homonyms are contiguous. | |
8632 | ||
8fde064e | 8633 | if Present (E) and then E /= C_E then |
996ae0b0 RK |
8634 | while Homonym (C_E) /= E loop |
8635 | C_E := Homonym (C_E); | |
8636 | end loop; | |
8637 | ||
8638 | Set_Homonym (C_E, S); | |
8639 | ||
8640 | else | |
8641 | E := C_E; | |
8642 | Set_Current_Entity (S); | |
8643 | end if; | |
8644 | ||
8645 | Set_Homonym (S, E); | |
8646 | ||
2352eadb AC |
8647 | if Is_Inherited_Operation (S) then |
8648 | Append_Inherited_Subprogram (S); | |
8649 | else | |
8650 | Append_Entity (S, Current_Scope); | |
8651 | end if; | |
8652 | ||
996ae0b0 RK |
8653 | Set_Public_Status (S); |
8654 | ||
8655 | if Debug_Flag_E then | |
8656 | Write_Str ("New overloaded entity chain: "); | |
8657 | Write_Name (Chars (S)); | |
996ae0b0 | 8658 | |
82c80734 | 8659 | E := S; |
996ae0b0 RK |
8660 | while Present (E) loop |
8661 | Write_Str (" "); Write_Int (Int (E)); | |
8662 | E := Homonym (E); | |
8663 | end loop; | |
8664 | ||
8665 | Write_Eol; | |
8666 | end if; | |
8667 | ||
8668 | -- Generate warning for hiding | |
8669 | ||
8670 | if Warn_On_Hiding | |
8671 | and then Comes_From_Source (S) | |
8672 | and then In_Extended_Main_Source_Unit (S) | |
8673 | then | |
8674 | E := S; | |
8675 | loop | |
8676 | E := Homonym (E); | |
8677 | exit when No (E); | |
8678 | ||
7fc53871 AC |
8679 | -- Warn unless genuine overloading. Do not emit warning on |
8680 | -- hiding predefined operators in Standard (these are either an | |
8681 | -- (artifact of our implicit declarations, or simple noise) but | |
8682 | -- keep warning on a operator defined on a local subtype, because | |
8683 | -- of the real danger that different operators may be applied in | |
8684 | -- various parts of the program. | |
996ae0b0 | 8685 | |
1f250383 AC |
8686 | -- Note that if E and S have the same scope, there is never any |
8687 | -- hiding. Either the two conflict, and the program is illegal, | |
8688 | -- or S is overriding an implicit inherited subprogram. | |
8689 | ||
8690 | if Scope (E) /= Scope (S) | |
51b42ffa AC |
8691 | and then (not Is_Overloadable (E) |
8692 | or else Subtype_Conformant (E, S)) | |
8693 | and then (Is_Immediately_Visible (E) | |
8694 | or else Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 8695 | then |
51b42ffa AC |
8696 | if Scope (E) = Standard_Standard then |
8697 | if Nkind (S) = N_Defining_Operator_Symbol | |
8698 | and then Scope (Base_Type (Etype (First_Formal (S)))) /= | |
8699 | Scope (S) | |
8700 | and then Matches_Predefined_Op | |
8701 | then | |
8702 | Error_Msg_N | |
8703 | ("declaration of & hides predefined operator?h?", S); | |
8704 | end if; | |
8705 | ||
8706 | -- E not immediately within Standard | |
8707 | ||
8708 | else | |
7fc53871 | 8709 | Error_Msg_Sloc := Sloc (E); |
3ccedacc | 8710 | Error_Msg_N ("declaration of & hides one #?h?", S); |
7fc53871 | 8711 | end if; |
996ae0b0 RK |
8712 | end if; |
8713 | end loop; | |
8714 | end if; | |
8715 | end Enter_Overloaded_Entity; | |
8716 | ||
e5a58fac AC |
8717 | ----------------------------- |
8718 | -- Check_Untagged_Equality -- | |
8719 | ----------------------------- | |
8720 | ||
8721 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
8722 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
8723 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
8724 | Obj_Decl : Node_Id; | |
8725 | ||
8726 | begin | |
7c0c194b | 8727 | -- This check applies only if we have a subprogram declaration with an |
6ab24ed7 | 8728 | -- untagged record type that is conformant to the predefined op. |
b2834fbd AC |
8729 | |
8730 | if Nkind (Decl) /= N_Subprogram_Declaration | |
8731 | or else not Is_Record_Type (Typ) | |
8732 | or else Is_Tagged_Type (Typ) | |
6ab24ed7 | 8733 | or else Etype (Next_Formal (First_Formal (Eq_Op))) /= Typ |
e5a58fac | 8734 | then |
b2834fbd AC |
8735 | return; |
8736 | end if; | |
e5a58fac | 8737 | |
b2834fbd AC |
8738 | -- In Ada 2012 case, we will output errors or warnings depending on |
8739 | -- the setting of debug flag -gnatd.E. | |
8740 | ||
8741 | if Ada_Version >= Ada_2012 then | |
8742 | Error_Msg_Warn := Debug_Flag_Dot_EE; | |
8743 | ||
8744 | -- In earlier versions of Ada, nothing to do unless we are warning on | |
8745 | -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). | |
8746 | ||
8747 | else | |
8748 | if not Warn_On_Ada_2012_Compatibility then | |
8749 | return; | |
8750 | end if; | |
8751 | end if; | |
8752 | ||
8753 | -- Cases where the type has already been frozen | |
e5a58fac | 8754 | |
b2834fbd AC |
8755 | if Is_Frozen (Typ) then |
8756 | ||
2bbc7940 ES |
8757 | -- The check applies to a primitive operation, so check that type |
8758 | -- and equality operation are in the same scope. | |
b2834fbd | 8759 | |
2bbc7940 | 8760 | if Scope (Typ) /= Current_Scope then |
b2834fbd AC |
8761 | return; |
8762 | ||
8763 | -- If the type is a generic actual (sub)type, the operation is not | |
8764 | -- primitive either because the base type is declared elsewhere. | |
8765 | ||
8766 | elsif Is_Generic_Actual_Type (Typ) then | |
8767 | return; | |
8768 | ||
8769 | -- Here we have a definite error of declaration after freezing | |
8770 | ||
8771 | else | |
8772 | if Ada_Version >= Ada_2012 then | |
ae6ede77 | 8773 | Error_Msg_NE |
3ccedacc | 8774 | ("equality operator must be declared before type & is " |
b2834fbd AC |
8775 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); |
8776 | ||
8777 | -- In Ada 2012 mode with error turned to warning, output one | |
8778 | -- more warning to warn that the equality operation may not | |
8779 | -- compose. This is the consequence of ignoring the error. | |
8780 | ||
8781 | if Error_Msg_Warn then | |
8782 | Error_Msg_N ("\equality operation may not compose??", Eq_Op); | |
8783 | end if; | |
21a5b575 AC |
8784 | |
8785 | else | |
8786 | Error_Msg_NE | |
b2834fbd AC |
8787 | ("equality operator must be declared before type& is " |
8788 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); | |
8789 | end if; | |
8790 | ||
8791 | -- If we are in the package body, we could just move the | |
8792 | -- declaration to the package spec, so add a message saying that. | |
8793 | ||
8794 | if In_Package_Body (Scope (Typ)) then | |
8795 | if Ada_Version >= Ada_2012 then | |
8796 | Error_Msg_N | |
8797 | ("\move declaration to package spec<<", Eq_Op); | |
8798 | else | |
8799 | Error_Msg_N | |
8800 | ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); | |
8801 | end if; | |
21a5b575 | 8802 | |
2bbc7940 | 8803 | -- Otherwise try to find the freezing point for better message. |
b2834fbd AC |
8804 | |
8805 | else | |
21a5b575 | 8806 | Obj_Decl := Next (Parent (Typ)); |
dbfeb4fa | 8807 | while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
21a5b575 AC |
8808 | if Nkind (Obj_Decl) = N_Object_Declaration |
8809 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
8810 | then | |
b2834fbd AC |
8811 | -- Freezing point, output warnings |
8812 | ||
8813 | if Ada_Version >= Ada_2012 then | |
8814 | Error_Msg_NE | |
8815 | ("type& is frozen by declaration??", Obj_Decl, Typ); | |
8816 | Error_Msg_N | |
8817 | ("\an equality operator cannot be declared after " | |
8818 | & "this point??", | |
8819 | Obj_Decl); | |
8820 | else | |
8821 | Error_Msg_NE | |
8822 | ("type& is frozen by declaration (Ada 2012)?y?", | |
8823 | Obj_Decl, Typ); | |
8824 | Error_Msg_N | |
8825 | ("\an equality operator cannot be declared after " | |
8826 | & "this point (Ada 2012)?y?", | |
8827 | Obj_Decl); | |
8828 | end if; | |
8829 | ||
21a5b575 | 8830 | exit; |
2bbc7940 ES |
8831 | |
8832 | -- If we reach generated code for subprogram declaration | |
8833 | -- or body, it is the body that froze the type and the | |
8834 | -- declaration is legal. | |
8835 | ||
8836 | elsif Sloc (Obj_Decl) = Sloc (Decl) then | |
8837 | return; | |
21a5b575 AC |
8838 | end if; |
8839 | ||
8840 | Next (Obj_Decl); | |
8841 | end loop; | |
8842 | end if; | |
b2834fbd | 8843 | end if; |
e5a58fac | 8844 | |
b2834fbd AC |
8845 | -- Here if type is not frozen yet. It is illegal to have a primitive |
8846 | -- equality declared in the private part if the type is visible. | |
21a5b575 | 8847 | |
b2834fbd AC |
8848 | elsif not In_Same_List (Parent (Typ), Decl) |
8849 | and then not Is_Limited_Type (Typ) | |
8850 | then | |
8851 | -- Shouldn't we give an RM reference here??? | |
21a5b575 | 8852 | |
b2834fbd AC |
8853 | if Ada_Version >= Ada_2012 then |
8854 | Error_Msg_N | |
8855 | ("equality operator appears too late<<", Eq_Op); | |
8856 | else | |
8857 | Error_Msg_N | |
8858 | ("equality operator appears too late (Ada 2012)?y?", Eq_Op); | |
e5a58fac | 8859 | end if; |
b2834fbd AC |
8860 | |
8861 | -- No error detected | |
8862 | ||
8863 | else | |
8864 | return; | |
e5a58fac AC |
8865 | end if; |
8866 | end Check_Untagged_Equality; | |
8867 | ||
996ae0b0 RK |
8868 | ----------------------------- |
8869 | -- Find_Corresponding_Spec -- | |
8870 | ----------------------------- | |
8871 | ||
d44202ba HK |
8872 | function Find_Corresponding_Spec |
8873 | (N : Node_Id; | |
8874 | Post_Error : Boolean := True) return Entity_Id | |
8875 | is | |
996ae0b0 RK |
8876 | Spec : constant Node_Id := Specification (N); |
8877 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
8878 | ||
8879 | E : Entity_Id; | |
8880 | ||
70f4ad20 AC |
8881 | function Different_Generic_Profile (E : Entity_Id) return Boolean; |
8882 | -- Even if fully conformant, a body may depend on a generic actual when | |
8883 | -- the spec does not, or vice versa, in which case they were distinct | |
8884 | -- entities in the generic. | |
8885 | ||
8886 | ------------------------------- | |
8887 | -- Different_Generic_Profile -- | |
8888 | ------------------------------- | |
8889 | ||
8890 | function Different_Generic_Profile (E : Entity_Id) return Boolean is | |
8891 | F1, F2 : Entity_Id; | |
8892 | ||
2995860f AC |
8893 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
8894 | -- Check that the types of corresponding formals have the same | |
8895 | -- generic actual if any. We have to account for subtypes of a | |
8896 | -- generic formal, declared between a spec and a body, which may | |
73999267 AC |
8897 | -- appear distinct in an instance but matched in the generic, and |
8898 | -- the subtype may be used either in the spec or the body of the | |
8899 | -- subprogram being checked. | |
2995860f AC |
8900 | |
8901 | ------------------------- | |
8902 | -- Same_Generic_Actual -- | |
8903 | ------------------------- | |
8904 | ||
8905 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is | |
73999267 AC |
8906 | |
8907 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean; | |
8908 | -- Predicate to check whether S1 is a subtype of S2 in the source | |
8909 | -- of the instance. | |
8910 | ||
8911 | ------------------------- | |
8912 | -- Is_Declared_Subtype -- | |
8913 | ------------------------- | |
8914 | ||
8915 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean is | |
8916 | begin | |
8917 | return Comes_From_Source (Parent (S1)) | |
8918 | and then Nkind (Parent (S1)) = N_Subtype_Declaration | |
8919 | and then Is_Entity_Name (Subtype_Indication (Parent (S1))) | |
8920 | and then Entity (Subtype_Indication (Parent (S1))) = S2; | |
8921 | end Is_Declared_Subtype; | |
8922 | ||
8923 | -- Start of processing for Same_Generic_Actual | |
8924 | ||
2995860f AC |
8925 | begin |
8926 | return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) | |
73999267 AC |
8927 | or else Is_Declared_Subtype (T1, T2) |
8928 | or else Is_Declared_Subtype (T2, T1); | |
2995860f AC |
8929 | end Same_Generic_Actual; |
8930 | ||
8931 | -- Start of processing for Different_Generic_Profile | |
8932 | ||
70f4ad20 | 8933 | begin |
2995860f AC |
8934 | if not In_Instance then |
8935 | return False; | |
8936 | ||
8937 | elsif Ekind (E) = E_Function | |
8938 | and then not Same_Generic_Actual (Etype (E), Etype (Designator)) | |
70f4ad20 AC |
8939 | then |
8940 | return True; | |
8941 | end if; | |
8942 | ||
8943 | F1 := First_Formal (Designator); | |
8944 | F2 := First_Formal (E); | |
70f4ad20 | 8945 | while Present (F1) loop |
2995860f | 8946 | if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
70f4ad20 AC |
8947 | return True; |
8948 | end if; | |
8949 | ||
8950 | Next_Formal (F1); | |
8951 | Next_Formal (F2); | |
8952 | end loop; | |
8953 | ||
8954 | return False; | |
8955 | end Different_Generic_Profile; | |
8956 | ||
8957 | -- Start of processing for Find_Corresponding_Spec | |
8958 | ||
996ae0b0 RK |
8959 | begin |
8960 | E := Current_Entity (Designator); | |
996ae0b0 RK |
8961 | while Present (E) loop |
8962 | ||
8963 | -- We are looking for a matching spec. It must have the same scope, | |
8964 | -- and the same name, and either be type conformant, or be the case | |
8965 | -- of a library procedure spec and its body (which belong to one | |
8966 | -- another regardless of whether they are type conformant or not). | |
8967 | ||
8968 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
8969 | if Current_Scope = Standard_Standard |
8970 | or else (Ekind (E) = Ekind (Designator) | |
586ecbf3 | 8971 | and then Type_Conformant (E, Designator)) |
996ae0b0 RK |
8972 | then |
8973 | -- Within an instantiation, we know that spec and body are | |
70f4ad20 AC |
8974 | -- subtype conformant, because they were subtype conformant in |
8975 | -- the generic. We choose the subtype-conformant entity here as | |
8976 | -- well, to resolve spurious ambiguities in the instance that | |
8977 | -- were not present in the generic (i.e. when two different | |
8978 | -- types are given the same actual). If we are looking for a | |
8979 | -- spec to match a body, full conformance is expected. | |
996ae0b0 RK |
8980 | |
8981 | if In_Instance then | |
c05ba1f1 AC |
8982 | |
8983 | -- Inherit the convention and "ghostness" of the matching | |
8984 | -- spec to ensure proper full and subtype conformance. | |
8985 | ||
996ae0b0 RK |
8986 | Set_Convention (Designator, Convention (E)); |
8987 | ||
0187b60e AC |
8988 | -- Skip past subprogram bodies and subprogram renamings that |
8989 | -- may appear to have a matching spec, but that aren't fully | |
8990 | -- conformant with it. That can occur in cases where an | |
8991 | -- actual type causes unrelated homographs in the instance. | |
8992 | ||
8993 | if Nkind_In (N, N_Subprogram_Body, | |
8994 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 8995 | and then Present (Homonym (E)) |
c7b9d548 | 8996 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
8997 | then |
8998 | goto Next_Entity; | |
8999 | ||
c7b9d548 | 9000 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 | 9001 | goto Next_Entity; |
70f4ad20 AC |
9002 | |
9003 | elsif Different_Generic_Profile (E) then | |
9004 | goto Next_Entity; | |
996ae0b0 RK |
9005 | end if; |
9006 | end if; | |
9007 | ||
25ebc085 AC |
9008 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
9009 | -- null procedures locate the internally generated spec. We | |
9010 | -- enforce mode conformance since a tagged type may inherit | |
9011 | -- from interfaces several null primitives which differ only | |
9012 | -- in the mode of the formals. | |
9013 | ||
9014 | if not (Comes_From_Source (E)) | |
9015 | and then Is_Null_Procedure (E) | |
9016 | and then not Mode_Conformant (Designator, E) | |
9017 | then | |
9018 | null; | |
9019 | ||
4d8f3296 ES |
9020 | -- For null procedures coming from source that are completions, |
9021 | -- analysis of the generated body will establish the link. | |
9022 | ||
9023 | elsif Comes_From_Source (E) | |
9024 | and then Nkind (Spec) = N_Procedure_Specification | |
9025 | and then Null_Present (Spec) | |
9026 | then | |
9027 | return E; | |
9028 | ||
e4bda610 AC |
9029 | -- Expression functions can be completions, but cannot be |
9030 | -- completed by an explicit body. | |
9031 | ||
9032 | elsif Comes_From_Source (E) | |
9033 | and then Comes_From_Source (N) | |
9034 | and then Nkind (N) = N_Subprogram_Body | |
9035 | and then Nkind (Original_Node (Unit_Declaration_Node (E))) = | |
9036 | N_Expression_Function | |
9037 | then | |
9038 | Error_Msg_Sloc := Sloc (E); | |
9039 | Error_Msg_N ("body conflicts with expression function#", N); | |
9040 | return Empty; | |
9041 | ||
25ebc085 | 9042 | elsif not Has_Completion (E) then |
996ae0b0 RK |
9043 | if Nkind (N) /= N_Subprogram_Body_Stub then |
9044 | Set_Corresponding_Spec (N, E); | |
9045 | end if; | |
9046 | ||
9047 | Set_Has_Completion (E); | |
9048 | return E; | |
9049 | ||
9050 | elsif Nkind (Parent (N)) = N_Subunit then | |
9051 | ||
9052 | -- If this is the proper body of a subunit, the completion | |
9053 | -- flag is set when analyzing the stub. | |
9054 | ||
9055 | return E; | |
9056 | ||
70f4ad20 AC |
9057 | -- If E is an internal function with a controlling result that |
9058 | -- was created for an operation inherited by a null extension, | |
9059 | -- it may be overridden by a body without a previous spec (one | |
2995860f | 9060 | -- more reason why these should be shunned). In that case we |
70f4ad20 AC |
9061 | -- remove the generated body if present, because the current |
9062 | -- one is the explicit overriding. | |
81db9d77 ES |
9063 | |
9064 | elsif Ekind (E) = E_Function | |
0791fbe9 | 9065 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
9066 | and then not Comes_From_Source (E) |
9067 | and then Has_Controlling_Result (E) | |
9068 | and then Is_Null_Extension (Etype (E)) | |
9069 | and then Comes_From_Source (Spec) | |
9070 | then | |
9071 | Set_Has_Completion (E, False); | |
9072 | ||
1366997b AC |
9073 | if Expander_Active |
9074 | and then Nkind (Parent (E)) = N_Function_Specification | |
9075 | then | |
81db9d77 ES |
9076 | Remove |
9077 | (Unit_Declaration_Node | |
1366997b AC |
9078 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
9079 | ||
81db9d77 ES |
9080 | return E; |
9081 | ||
1366997b AC |
9082 | -- If expansion is disabled, or if the wrapper function has |
9083 | -- not been generated yet, this a late body overriding an | |
9084 | -- inherited operation, or it is an overriding by some other | |
9085 | -- declaration before the controlling result is frozen. In | |
9086 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
9087 | |
9088 | else | |
9089 | return Empty; | |
9090 | end if; | |
9091 | ||
d44202ba HK |
9092 | -- If the body already exists, then this is an error unless |
9093 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
9094 | -- derived subprogram. It is also legal for an instance to |
9095 | -- contain type conformant overloadable declarations (but the | |
9096 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
9097 | |
9098 | elsif No (Alias (E)) | |
9099 | and then not Is_Intrinsic_Subprogram (E) | |
9100 | and then not In_Instance | |
d44202ba | 9101 | and then Post_Error |
996ae0b0 RK |
9102 | then |
9103 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 9104 | |
07fc65c4 GB |
9105 | if Is_Imported (E) then |
9106 | Error_Msg_NE | |
9107 | ("body not allowed for imported subprogram & declared#", | |
9108 | N, E); | |
9109 | else | |
9110 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
9111 | end if; | |
996ae0b0 RK |
9112 | end if; |
9113 | ||
d44202ba HK |
9114 | -- Child units cannot be overloaded, so a conformance mismatch |
9115 | -- between body and a previous spec is an error. | |
9116 | ||
996ae0b0 RK |
9117 | elsif Is_Child_Unit (E) |
9118 | and then | |
9119 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
9120 | and then | |
5d37ba92 | 9121 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
9122 | N_Compilation_Unit |
9123 | and then Post_Error | |
996ae0b0 | 9124 | then |
996ae0b0 RK |
9125 | Error_Msg_N |
9126 | ("body of child unit does not match previous declaration", N); | |
9127 | end if; | |
9128 | end if; | |
9129 | ||
9130 | <<Next_Entity>> | |
9131 | E := Homonym (E); | |
9132 | end loop; | |
9133 | ||
9134 | -- On exit, we know that no previous declaration of subprogram exists | |
9135 | ||
9136 | return Empty; | |
9137 | end Find_Corresponding_Spec; | |
9138 | ||
9139 | ---------------------- | |
9140 | -- Fully_Conformant -- | |
9141 | ---------------------- | |
9142 | ||
9143 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
9144 | Result : Boolean; | |
996ae0b0 RK |
9145 | begin |
9146 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
9147 | return Result; | |
9148 | end Fully_Conformant; | |
9149 | ||
9150 | ---------------------------------- | |
9151 | -- Fully_Conformant_Expressions -- | |
9152 | ---------------------------------- | |
9153 | ||
9154 | function Fully_Conformant_Expressions | |
9155 | (Given_E1 : Node_Id; | |
5f531fef ES |
9156 | Given_E2 : Node_Id; |
9157 | Report : Boolean := False) return Boolean | |
996ae0b0 RK |
9158 | is |
9159 | E1 : constant Node_Id := Original_Node (Given_E1); | |
9160 | E2 : constant Node_Id := Original_Node (Given_E2); | |
9161 | -- We always test conformance on original nodes, since it is possible | |
9162 | -- for analysis and/or expansion to make things look as though they | |
9163 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
9164 | ||
2401c98f HK |
9165 | function FCE (Given_E1 : Node_Id; Given_E2 : Node_Id) return Boolean; |
9166 | -- ??? | |
996ae0b0 | 9167 | |
2401c98f | 9168 | function FCL (L1 : List_Id; L2 : List_Id) return Boolean; |
70f4ad20 AC |
9169 | -- Compare elements of two lists for conformance. Elements have to be |
9170 | -- conformant, and actuals inserted as default parameters do not match | |
9171 | -- explicit actuals with the same value. | |
996ae0b0 | 9172 | |
2401c98f | 9173 | function FCO (Op_Node : Node_Id; Call_Node : Node_Id) return Boolean; |
e895b435 | 9174 | -- Compare an operator node with a function call |
996ae0b0 | 9175 | |
2401c98f HK |
9176 | --------- |
9177 | -- FCE -- | |
9178 | --------- | |
9179 | ||
9180 | function FCE (Given_E1 : Node_Id; Given_E2 : Node_Id) return Boolean is | |
9181 | begin | |
9182 | return Fully_Conformant_Expressions (Given_E1, Given_E2, Report); | |
9183 | end FCE; | |
9184 | ||
996ae0b0 RK |
9185 | --------- |
9186 | -- FCL -- | |
9187 | --------- | |
9188 | ||
2401c98f HK |
9189 | function FCL (L1 : List_Id; L2 : List_Id) return Boolean is |
9190 | N1 : Node_Id; | |
9191 | N2 : Node_Id; | |
996ae0b0 RK |
9192 | |
9193 | begin | |
9194 | if L1 = No_List then | |
9195 | N1 := Empty; | |
9196 | else | |
9197 | N1 := First (L1); | |
9198 | end if; | |
9199 | ||
9200 | if L2 = No_List then | |
9201 | N2 := Empty; | |
9202 | else | |
9203 | N2 := First (L2); | |
9204 | end if; | |
9205 | ||
70f4ad20 | 9206 | -- Compare two lists, skipping rewrite insertions (we want to compare |
a90bd866 | 9207 | -- the original trees, not the expanded versions). |
996ae0b0 RK |
9208 | |
9209 | loop | |
9210 | if Is_Rewrite_Insertion (N1) then | |
9211 | Next (N1); | |
9212 | elsif Is_Rewrite_Insertion (N2) then | |
9213 | Next (N2); | |
9214 | elsif No (N1) then | |
9215 | return No (N2); | |
9216 | elsif No (N2) then | |
9217 | return False; | |
9218 | elsif not FCE (N1, N2) then | |
9219 | return False; | |
9220 | else | |
9221 | Next (N1); | |
9222 | Next (N2); | |
9223 | end if; | |
9224 | end loop; | |
9225 | end FCL; | |
9226 | ||
9227 | --------- | |
9228 | -- FCO -- | |
9229 | --------- | |
9230 | ||
2401c98f | 9231 | function FCO (Op_Node : Node_Id; Call_Node : Node_Id) return Boolean is |
996ae0b0 RK |
9232 | Actuals : constant List_Id := Parameter_Associations (Call_Node); |
9233 | Act : Node_Id; | |
9234 | ||
9235 | begin | |
9236 | if No (Actuals) | |
9237 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
9238 | then | |
9239 | return False; | |
9240 | ||
9241 | else | |
9242 | Act := First (Actuals); | |
9243 | ||
9244 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
9245 | if not FCE (Left_Opnd (Op_Node), Act) then |
9246 | return False; | |
9247 | end if; | |
9248 | ||
9249 | Next (Act); | |
9250 | end if; | |
9251 | ||
9252 | return Present (Act) | |
9253 | and then FCE (Right_Opnd (Op_Node), Act) | |
9254 | and then No (Next (Act)); | |
9255 | end if; | |
9256 | end FCO; | |
9257 | ||
2401c98f HK |
9258 | -- Local variables |
9259 | ||
9260 | Result : Boolean; | |
9261 | ||
996ae0b0 RK |
9262 | -- Start of processing for Fully_Conformant_Expressions |
9263 | ||
9264 | begin | |
5f531fef ES |
9265 | Result := True; |
9266 | ||
27bb7941 | 9267 | -- Nonconformant if paren count does not match. Note: if some idiot |
996ae0b0 | 9268 | -- complains that we don't do this right for more than 3 levels of |
a90bd866 | 9269 | -- parentheses, they will be treated with the respect they deserve. |
996ae0b0 RK |
9270 | |
9271 | if Paren_Count (E1) /= Paren_Count (E2) then | |
9272 | return False; | |
9273 | ||
82c80734 RD |
9274 | -- If same entities are referenced, then they are conformant even if |
9275 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
9276 | |
9277 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
9278 | if Present (Entity (E1)) then | |
5f531fef | 9279 | Result := Entity (E1) = Entity (E2) |
ca0eb951 | 9280 | |
31e358e1 AC |
9281 | -- One may be a discriminant that has been replaced by the |
9282 | -- corresponding discriminal. | |
ca0eb951 | 9283 | |
31e358e1 AC |
9284 | or else |
9285 | (Chars (Entity (E1)) = Chars (Entity (E2)) | |
9286 | and then Ekind (Entity (E1)) = E_Discriminant | |
9287 | and then Ekind (Entity (E2)) = E_In_Parameter) | |
ca0eb951 | 9288 | |
d59179b1 AC |
9289 | -- The discriminant of a protected type is transformed into |
9290 | -- a local constant and then into a parameter of a protected | |
9291 | -- operation. | |
9292 | ||
31e358e1 AC |
9293 | or else |
9294 | (Ekind (Entity (E1)) = E_Constant | |
d59179b1 AC |
9295 | and then Ekind (Entity (E2)) = E_In_Parameter |
9296 | and then Present (Discriminal_Link (Entity (E1))) | |
9297 | and then Discriminal_Link (Entity (E1)) = | |
9298 | Discriminal_Link (Entity (E2))) | |
9299 | ||
c7862167 HK |
9300 | -- AI12-050: The loop variables of quantified expressions match |
9301 | -- if they have the same identifier, even though they may have | |
9302 | -- different entities. | |
ca0eb951 | 9303 | |
31e358e1 AC |
9304 | or else |
9305 | (Chars (Entity (E1)) = Chars (Entity (E2)) | |
9306 | and then Ekind (Entity (E1)) = E_Loop_Parameter | |
e7e72f9b ES |
9307 | and then Ekind (Entity (E2)) = E_Loop_Parameter) |
9308 | ||
9309 | -- A call to an instantiation of Unchecked_Conversion is | |
c7862167 HK |
9310 | -- rewritten with the name of the generated function created for |
9311 | -- the instance, and this must be special-cased. | |
e7e72f9b ES |
9312 | |
9313 | or else | |
9314 | (Ekind (Entity (E1)) = E_Function | |
9315 | and then Is_Intrinsic_Subprogram (Entity (E1)) | |
9316 | and then Is_Generic_Instance (Entity (E1)) | |
9317 | and then Entity (E2) = Alias (Entity (E1))); | |
5f531fef ES |
9318 | if Report and not Result then |
9319 | Error_Msg_Sloc := | |
9320 | Text_Ptr'Max (Sloc (Entity (E1)), Sloc (Entity (E2))); | |
9321 | Error_Msg_NE | |
9322 | ("Meaning of& differs because of declaration#", E1, E2); | |
9323 | end if; | |
9324 | ||
9325 | return Result; | |
996ae0b0 RK |
9326 | |
9327 | elsif Nkind (E1) = N_Expanded_Name | |
9328 | and then Nkind (E2) = N_Expanded_Name | |
9329 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
9330 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
9331 | then | |
9332 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
9333 | ||
9334 | else | |
9335 | -- Identifiers in component associations don't always have | |
9336 | -- entities, but their names must conform. | |
9337 | ||
9338 | return Nkind (E1) = N_Identifier | |
9339 | and then Nkind (E2) = N_Identifier | |
9340 | and then Chars (E1) = Chars (E2); | |
9341 | end if; | |
9342 | ||
9343 | elsif Nkind (E1) = N_Character_Literal | |
9344 | and then Nkind (E2) = N_Expanded_Name | |
9345 | then | |
9346 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
9347 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
9348 | ||
9349 | elsif Nkind (E2) = N_Character_Literal | |
9350 | and then Nkind (E1) = N_Expanded_Name | |
9351 | then | |
9352 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
9353 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
9354 | ||
8fde064e | 9355 | elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
996ae0b0 RK |
9356 | return FCO (E1, E2); |
9357 | ||
8fde064e | 9358 | elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
996ae0b0 RK |
9359 | return FCO (E2, E1); |
9360 | ||
9361 | -- Otherwise we must have the same syntactic entity | |
9362 | ||
9363 | elsif Nkind (E1) /= Nkind (E2) then | |
9364 | return False; | |
9365 | ||
9366 | -- At this point, we specialize by node type | |
9367 | ||
9368 | else | |
9369 | case Nkind (E1) is | |
996ae0b0 RK |
9370 | when N_Aggregate => |
9371 | return | |
9372 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
9373 | and then |
9374 | FCL (Component_Associations (E1), | |
9375 | Component_Associations (E2)); | |
996ae0b0 RK |
9376 | |
9377 | when N_Allocator => | |
9378 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
9379 | or else | |
9380 | Nkind (Expression (E2)) = N_Qualified_Expression | |
9381 | then | |
9382 | return FCE (Expression (E1), Expression (E2)); | |
9383 | ||
9384 | -- Check that the subtype marks and any constraints | |
9385 | -- are conformant | |
9386 | ||
9387 | else | |
9388 | declare | |
9389 | Indic1 : constant Node_Id := Expression (E1); | |
9390 | Indic2 : constant Node_Id := Expression (E2); | |
9391 | Elt1 : Node_Id; | |
9392 | Elt2 : Node_Id; | |
9393 | ||
9394 | begin | |
9395 | if Nkind (Indic1) /= N_Subtype_Indication then | |
9396 | return | |
9397 | Nkind (Indic2) /= N_Subtype_Indication | |
9398 | and then Entity (Indic1) = Entity (Indic2); | |
9399 | ||
9400 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
9401 | return | |
9402 | Nkind (Indic1) /= N_Subtype_Indication | |
9403 | and then Entity (Indic1) = Entity (Indic2); | |
9404 | ||
9405 | else | |
9406 | if Entity (Subtype_Mark (Indic1)) /= | |
9407 | Entity (Subtype_Mark (Indic2)) | |
9408 | then | |
9409 | return False; | |
9410 | end if; | |
9411 | ||
9412 | Elt1 := First (Constraints (Constraint (Indic1))); | |
9413 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
9414 | while Present (Elt1) and then Present (Elt2) loop |
9415 | if not FCE (Elt1, Elt2) then | |
9416 | return False; | |
9417 | end if; | |
9418 | ||
9419 | Next (Elt1); | |
9420 | Next (Elt2); | |
9421 | end loop; | |
9422 | ||
9423 | return True; | |
9424 | end if; | |
9425 | end; | |
9426 | end if; | |
9427 | ||
9428 | when N_Attribute_Reference => | |
9429 | return | |
9430 | Attribute_Name (E1) = Attribute_Name (E2) | |
9431 | and then FCL (Expressions (E1), Expressions (E2)); | |
9432 | ||
9433 | when N_Binary_Op => | |
9434 | return | |
9435 | Entity (E1) = Entity (E2) | |
9436 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
9437 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
9438 | ||
d8f43ee6 HK |
9439 | when N_Membership_Test |
9440 | | N_Short_Circuit | |
9441 | => | |
996ae0b0 RK |
9442 | return |
9443 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
9444 | and then | |
9445 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
9446 | ||
19d846a0 RD |
9447 | when N_Case_Expression => |
9448 | declare | |
9449 | Alt1 : Node_Id; | |
9450 | Alt2 : Node_Id; | |
9451 | ||
9452 | begin | |
9453 | if not FCE (Expression (E1), Expression (E2)) then | |
9454 | return False; | |
9455 | ||
9456 | else | |
9457 | Alt1 := First (Alternatives (E1)); | |
9458 | Alt2 := First (Alternatives (E2)); | |
9459 | loop | |
9460 | if Present (Alt1) /= Present (Alt2) then | |
9461 | return False; | |
9462 | elsif No (Alt1) then | |
9463 | return True; | |
9464 | end if; | |
9465 | ||
9466 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
9467 | or else not FCL (Discrete_Choices (Alt1), | |
9468 | Discrete_Choices (Alt2)) | |
9469 | then | |
9470 | return False; | |
9471 | end if; | |
9472 | ||
9473 | Next (Alt1); | |
9474 | Next (Alt2); | |
9475 | end loop; | |
9476 | end if; | |
9477 | end; | |
9478 | ||
996ae0b0 RK |
9479 | when N_Character_Literal => |
9480 | return | |
9481 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
9482 | ||
9483 | when N_Component_Association => | |
9484 | return | |
9485 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
9486 | and then |
9487 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 9488 | |
996ae0b0 RK |
9489 | when N_Explicit_Dereference => |
9490 | return | |
9491 | FCE (Prefix (E1), Prefix (E2)); | |
9492 | ||
9493 | when N_Extension_Aggregate => | |
9494 | return | |
9495 | FCL (Expressions (E1), Expressions (E2)) | |
9496 | and then Null_Record_Present (E1) = | |
9497 | Null_Record_Present (E2) | |
9498 | and then FCL (Component_Associations (E1), | |
9499 | Component_Associations (E2)); | |
9500 | ||
9501 | when N_Function_Call => | |
9502 | return | |
9503 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
9504 | and then |
9505 | FCL (Parameter_Associations (E1), | |
9506 | Parameter_Associations (E2)); | |
996ae0b0 | 9507 | |
9b16cb57 RD |
9508 | when N_If_Expression => |
9509 | return | |
9510 | FCL (Expressions (E1), Expressions (E2)); | |
9511 | ||
996ae0b0 RK |
9512 | when N_Indexed_Component => |
9513 | return | |
9514 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9515 | and then |
9516 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
9517 | |
9518 | when N_Integer_Literal => | |
9519 | return (Intval (E1) = Intval (E2)); | |
9520 | ||
9521 | when N_Null => | |
9522 | return True; | |
9523 | ||
9524 | when N_Operator_Symbol => | |
9525 | return | |
9526 | Chars (E1) = Chars (E2); | |
9527 | ||
9528 | when N_Others_Choice => | |
9529 | return True; | |
9530 | ||
9531 | when N_Parameter_Association => | |
9532 | return | |
7dae9ca0 | 9533 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
996ae0b0 RK |
9534 | and then FCE (Explicit_Actual_Parameter (E1), |
9535 | Explicit_Actual_Parameter (E2)); | |
9536 | ||
304757d2 AC |
9537 | when N_Qualified_Expression |
9538 | | N_Type_Conversion | |
9539 | | N_Unchecked_Type_Conversion | |
9540 | => | |
996ae0b0 RK |
9541 | return |
9542 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
9543 | and then |
9544 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 9545 | |
2010d078 AC |
9546 | when N_Quantified_Expression => |
9547 | if not FCE (Condition (E1), Condition (E2)) then | |
9548 | return False; | |
9549 | end if; | |
9550 | ||
9551 | if Present (Loop_Parameter_Specification (E1)) | |
9552 | and then Present (Loop_Parameter_Specification (E2)) | |
9553 | then | |
9554 | declare | |
9555 | L1 : constant Node_Id := | |
9556 | Loop_Parameter_Specification (E1); | |
9557 | L2 : constant Node_Id := | |
9558 | Loop_Parameter_Specification (E2); | |
9559 | ||
9560 | begin | |
9561 | return | |
9562 | Reverse_Present (L1) = Reverse_Present (L2) | |
9563 | and then | |
9564 | FCE (Defining_Identifier (L1), | |
9565 | Defining_Identifier (L2)) | |
9566 | and then | |
9567 | FCE (Discrete_Subtype_Definition (L1), | |
9568 | Discrete_Subtype_Definition (L2)); | |
9569 | end; | |
9570 | ||
804670f1 AC |
9571 | elsif Present (Iterator_Specification (E1)) |
9572 | and then Present (Iterator_Specification (E2)) | |
9573 | then | |
2010d078 AC |
9574 | declare |
9575 | I1 : constant Node_Id := Iterator_Specification (E1); | |
9576 | I2 : constant Node_Id := Iterator_Specification (E2); | |
9577 | ||
9578 | begin | |
9579 | return | |
9580 | FCE (Defining_Identifier (I1), | |
9581 | Defining_Identifier (I2)) | |
9582 | and then | |
9583 | Of_Present (I1) = Of_Present (I2) | |
9584 | and then | |
9585 | Reverse_Present (I1) = Reverse_Present (I2) | |
9586 | and then FCE (Name (I1), Name (I2)) | |
9587 | and then FCE (Subtype_Indication (I1), | |
9588 | Subtype_Indication (I2)); | |
9589 | end; | |
804670f1 AC |
9590 | |
9591 | -- The quantified expressions used different specifications to | |
9592 | -- walk their respective ranges. | |
9593 | ||
9594 | else | |
9595 | return False; | |
2010d078 AC |
9596 | end if; |
9597 | ||
996ae0b0 RK |
9598 | when N_Range => |
9599 | return | |
9600 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
9601 | and then |
9602 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
9603 | |
9604 | when N_Real_Literal => | |
9605 | return (Realval (E1) = Realval (E2)); | |
9606 | ||
9607 | when N_Selected_Component => | |
9608 | return | |
9609 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9610 | and then |
9611 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
9612 | |
9613 | when N_Slice => | |
9614 | return | |
9615 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9616 | and then |
9617 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
9618 | |
9619 | when N_String_Literal => | |
9620 | declare | |
9621 | S1 : constant String_Id := Strval (E1); | |
9622 | S2 : constant String_Id := Strval (E2); | |
9623 | L1 : constant Nat := String_Length (S1); | |
9624 | L2 : constant Nat := String_Length (S2); | |
9625 | ||
9626 | begin | |
9627 | if L1 /= L2 then | |
9628 | return False; | |
9629 | ||
9630 | else | |
9631 | for J in 1 .. L1 loop | |
9632 | if Get_String_Char (S1, J) /= | |
9633 | Get_String_Char (S2, J) | |
9634 | then | |
9635 | return False; | |
9636 | end if; | |
9637 | end loop; | |
9638 | ||
9639 | return True; | |
9640 | end if; | |
9641 | end; | |
9642 | ||
996ae0b0 RK |
9643 | when N_Unary_Op => |
9644 | return | |
9645 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
9646 | and then |
9647 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 | 9648 | |
996ae0b0 RK |
9649 | -- All other node types cannot appear in this context. Strictly |
9650 | -- we should raise a fatal internal error. Instead we just ignore | |
9651 | -- the nodes. This means that if anyone makes a mistake in the | |
2995860f AC |
9652 | -- expander and mucks an expression tree irretrievably, the result |
9653 | -- will be a failure to detect a (probably very obscure) case | |
9654 | -- of non-conformance, which is better than bombing on some | |
996ae0b0 RK |
9655 | -- case where two expressions do in fact conform. |
9656 | ||
9657 | when others => | |
9658 | return True; | |
996ae0b0 RK |
9659 | end case; |
9660 | end if; | |
9661 | end Fully_Conformant_Expressions; | |
9662 | ||
fbf5a39b AC |
9663 | ---------------------------------------- |
9664 | -- Fully_Conformant_Discrete_Subtypes -- | |
9665 | ---------------------------------------- | |
9666 | ||
9667 | function Fully_Conformant_Discrete_Subtypes | |
9668 | (Given_S1 : Node_Id; | |
d05ef0ab | 9669 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
9670 | is |
9671 | S1 : constant Node_Id := Original_Node (Given_S1); | |
9672 | S2 : constant Node_Id := Original_Node (Given_S2); | |
9673 | ||
9674 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
9675 | -- Special-case for a bound given by a discriminant, which in the body |
9676 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
9677 | |
9678 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 9679 | -- Check both bounds |
fbf5a39b | 9680 | |
5d37ba92 ES |
9681 | ----------------------- |
9682 | -- Conforming_Bounds -- | |
9683 | ----------------------- | |
9684 | ||
fbf5a39b AC |
9685 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
9686 | begin | |
9687 | if Is_Entity_Name (B1) | |
9688 | and then Is_Entity_Name (B2) | |
9689 | and then Ekind (Entity (B1)) = E_Discriminant | |
9690 | then | |
9691 | return Chars (B1) = Chars (B2); | |
9692 | ||
9693 | else | |
9694 | return Fully_Conformant_Expressions (B1, B2); | |
9695 | end if; | |
9696 | end Conforming_Bounds; | |
9697 | ||
5d37ba92 ES |
9698 | ----------------------- |
9699 | -- Conforming_Ranges -- | |
9700 | ----------------------- | |
9701 | ||
fbf5a39b AC |
9702 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
9703 | begin | |
9704 | return | |
9705 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
9706 | and then | |
9707 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
9708 | end Conforming_Ranges; | |
9709 | ||
9710 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
9711 | ||
9712 | begin | |
9713 | if Nkind (S1) /= Nkind (S2) then | |
9714 | return False; | |
9715 | ||
9716 | elsif Is_Entity_Name (S1) then | |
9717 | return Entity (S1) = Entity (S2); | |
9718 | ||
9719 | elsif Nkind (S1) = N_Range then | |
9720 | return Conforming_Ranges (S1, S2); | |
9721 | ||
9722 | elsif Nkind (S1) = N_Subtype_Indication then | |
9723 | return | |
9724 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
9725 | and then | |
9726 | Conforming_Ranges | |
9727 | (Range_Expression (Constraint (S1)), | |
9728 | Range_Expression (Constraint (S2))); | |
9729 | else | |
9730 | return True; | |
9731 | end if; | |
9732 | end Fully_Conformant_Discrete_Subtypes; | |
9733 | ||
996ae0b0 RK |
9734 | -------------------- |
9735 | -- Install_Entity -- | |
9736 | -------------------- | |
9737 | ||
9738 | procedure Install_Entity (E : Entity_Id) is | |
9739 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
9740 | begin |
9741 | Set_Is_Immediately_Visible (E); | |
9742 | Set_Current_Entity (E); | |
9743 | Set_Homonym (E, Prev); | |
9744 | end Install_Entity; | |
9745 | ||
9746 | --------------------- | |
9747 | -- Install_Formals -- | |
9748 | --------------------- | |
9749 | ||
9750 | procedure Install_Formals (Id : Entity_Id) is | |
9751 | F : Entity_Id; | |
996ae0b0 RK |
9752 | begin |
9753 | F := First_Formal (Id); | |
996ae0b0 RK |
9754 | while Present (F) loop |
9755 | Install_Entity (F); | |
9756 | Next_Formal (F); | |
9757 | end loop; | |
9758 | end Install_Formals; | |
9759 | ||
ce2b6ba5 JM |
9760 | ----------------------------- |
9761 | -- Is_Interface_Conformant -- | |
9762 | ----------------------------- | |
9763 | ||
9764 | function Is_Interface_Conformant | |
9765 | (Tagged_Type : Entity_Id; | |
9766 | Iface_Prim : Entity_Id; | |
9767 | Prim : Entity_Id) return Boolean | |
9768 | is | |
9e92ad49 AC |
9769 | -- The operation may in fact be an inherited (implicit) operation |
9770 | -- rather than the original interface primitive, so retrieve the | |
9771 | -- ultimate ancestor. | |
9772 | ||
9773 | Iface : constant Entity_Id := | |
9774 | Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); | |
fceeaab6 ES |
9775 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
9776 | ||
25ebc085 AC |
9777 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
9778 | -- Return the controlling formal of Prim | |
9779 | ||
59e6b23c AC |
9780 | ------------------------ |
9781 | -- Controlling_Formal -- | |
9782 | ------------------------ | |
9783 | ||
25ebc085 | 9784 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
15918371 | 9785 | E : Entity_Id; |
59e6b23c | 9786 | |
25ebc085 | 9787 | begin |
15918371 | 9788 | E := First_Entity (Prim); |
25ebc085 AC |
9789 | while Present (E) loop |
9790 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
9791 | return E; | |
9792 | end if; | |
9793 | ||
9794 | Next_Entity (E); | |
9795 | end loop; | |
9796 | ||
9797 | return Empty; | |
9798 | end Controlling_Formal; | |
9799 | ||
9800 | -- Local variables | |
9801 | ||
9802 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
9803 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
9804 | ||
9805 | -- Start of processing for Is_Interface_Conformant | |
9806 | ||
ce2b6ba5 JM |
9807 | begin |
9808 | pragma Assert (Is_Subprogram (Iface_Prim) | |
9809 | and then Is_Subprogram (Prim) | |
9810 | and then Is_Dispatching_Operation (Iface_Prim) | |
9811 | and then Is_Dispatching_Operation (Prim)); | |
9812 | ||
fceeaab6 | 9813 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
9814 | or else (Present (Alias (Iface_Prim)) |
9815 | and then | |
9816 | Is_Interface | |
9817 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
9818 | ||
9819 | if Prim = Iface_Prim | |
9820 | or else not Is_Subprogram (Prim) | |
9821 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
9822 | or else not Is_Dispatching_Operation (Prim) | |
9823 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 | 9824 | or else No (Typ) |
8a49a499 | 9825 | or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
ce2b6ba5 JM |
9826 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
9827 | then | |
9828 | return False; | |
9829 | ||
25ebc085 AC |
9830 | -- The mode of the controlling formals must match |
9831 | ||
9832 | elsif Present (Iface_Ctrl_F) | |
15918371 AC |
9833 | and then Present (Prim_Ctrl_F) |
9834 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
25ebc085 AC |
9835 | then |
9836 | return False; | |
9837 | ||
9838 | -- Case of a procedure, or a function whose result type matches the | |
9839 | -- result type of the interface primitive, or a function that has no | |
9840 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
9841 | |
9842 | elsif Ekind (Iface_Prim) = E_Procedure | |
9843 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 9844 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 9845 | then |
b4d7b435 AC |
9846 | return Type_Conformant |
9847 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 9848 | |
2995860f AC |
9849 | -- Case of a function returning an interface, or an access to one. Check |
9850 | -- that the return types correspond. | |
ce2b6ba5 | 9851 | |
fceeaab6 ES |
9852 | elsif Implements_Interface (Typ, Iface) then |
9853 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
9854 | /= |
9855 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
9856 | then |
9857 | return False; | |
fceeaab6 ES |
9858 | else |
9859 | return | |
9e92ad49 | 9860 | Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
ce2b6ba5 | 9861 | Skip_Controlling_Formals => True); |
fceeaab6 | 9862 | end if; |
ce2b6ba5 | 9863 | |
fceeaab6 ES |
9864 | else |
9865 | return False; | |
ce2b6ba5 | 9866 | end if; |
ce2b6ba5 JM |
9867 | end Is_Interface_Conformant; |
9868 | ||
996ae0b0 RK |
9869 | --------------------------------- |
9870 | -- Is_Non_Overriding_Operation -- | |
9871 | --------------------------------- | |
9872 | ||
9873 | function Is_Non_Overriding_Operation | |
9874 | (Prev_E : Entity_Id; | |
d05ef0ab | 9875 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
9876 | is |
9877 | Formal : Entity_Id; | |
9878 | F_Typ : Entity_Id; | |
9879 | G_Typ : Entity_Id := Empty; | |
9880 | ||
9881 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
9882 | -- If F_Type is a derived type associated with a generic actual subtype, |
9883 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
9884 | |
9885 | function Types_Correspond | |
9886 | (P_Type : Entity_Id; | |
d05ef0ab | 9887 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
9888 | -- Returns true if and only if the types (or designated types in the |
9889 | -- case of anonymous access types) are the same or N_Type is derived | |
9890 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
9891 | |
9892 | ----------------------------- | |
9893 | -- Get_Generic_Parent_Type -- | |
9894 | ----------------------------- | |
9895 | ||
9896 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
9897 | G_Typ : Entity_Id; | |
702d2020 | 9898 | Defn : Node_Id; |
996ae0b0 RK |
9899 | Indic : Node_Id; |
9900 | ||
9901 | begin | |
9902 | if Is_Derived_Type (F_Typ) | |
9903 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
9904 | then | |
82c80734 RD |
9905 | -- The tree must be traversed to determine the parent subtype in |
9906 | -- the generic unit, which unfortunately isn't always available | |
9907 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
9908 | -- is needed for cases where a full derived type has been | |
9909 | -- rewritten.) | |
996ae0b0 | 9910 | |
bff469f7 AC |
9911 | -- If the parent type is a scalar type, the derivation creates |
9912 | -- an anonymous base type for it, and the source type is its | |
9913 | -- first subtype. | |
9914 | ||
9915 | if Is_Scalar_Type (F_Typ) | |
9916 | and then not Comes_From_Source (F_Typ) | |
9917 | then | |
9918 | Defn := | |
9919 | Type_Definition | |
0c6826a5 | 9920 | (Original_Node (Parent (First_Subtype (F_Typ)))); |
bff469f7 AC |
9921 | else |
9922 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); | |
9923 | end if; | |
702d2020 AC |
9924 | if Nkind (Defn) = N_Derived_Type_Definition then |
9925 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 9926 | |
702d2020 AC |
9927 | if Nkind (Indic) = N_Subtype_Indication then |
9928 | G_Typ := Entity (Subtype_Mark (Indic)); | |
9929 | else | |
9930 | G_Typ := Entity (Indic); | |
9931 | end if; | |
996ae0b0 | 9932 | |
702d2020 AC |
9933 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
9934 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
9935 | then | |
9936 | return Generic_Parent_Type (Parent (G_Typ)); | |
9937 | end if; | |
996ae0b0 RK |
9938 | end if; |
9939 | end if; | |
9940 | ||
9941 | return Empty; | |
9942 | end Get_Generic_Parent_Type; | |
9943 | ||
9944 | ---------------------- | |
9945 | -- Types_Correspond -- | |
9946 | ---------------------- | |
9947 | ||
9948 | function Types_Correspond | |
9949 | (P_Type : Entity_Id; | |
d05ef0ab | 9950 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
9951 | is |
9952 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
9953 | New_Type : Entity_Id := Base_Type (N_Type); | |
9954 | ||
9955 | begin | |
9956 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
9957 | Prev_Type := Designated_Type (Prev_Type); | |
9958 | end if; | |
9959 | ||
9960 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
9961 | New_Type := Designated_Type (New_Type); | |
9962 | end if; | |
9963 | ||
9964 | if Prev_Type = New_Type then | |
9965 | return True; | |
9966 | ||
9967 | elsif not Is_Class_Wide_Type (New_Type) then | |
9968 | while Etype (New_Type) /= New_Type loop | |
9969 | New_Type := Etype (New_Type); | |
0c6826a5 | 9970 | |
996ae0b0 RK |
9971 | if New_Type = Prev_Type then |
9972 | return True; | |
9973 | end if; | |
9974 | end loop; | |
9975 | end if; | |
9976 | return False; | |
9977 | end Types_Correspond; | |
9978 | ||
9979 | -- Start of processing for Is_Non_Overriding_Operation | |
9980 | ||
9981 | begin | |
82c80734 RD |
9982 | -- In the case where both operations are implicit derived subprograms |
9983 | -- then neither overrides the other. This can only occur in certain | |
9984 | -- obscure cases (e.g., derivation from homographs created in a generic | |
9985 | -- instantiation). | |
996ae0b0 RK |
9986 | |
9987 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
9988 | return True; | |
9989 | ||
9990 | elsif Ekind (Current_Scope) = E_Package | |
9991 | and then Is_Generic_Instance (Current_Scope) | |
9992 | and then In_Private_Part (Current_Scope) | |
9993 | and then Comes_From_Source (New_E) | |
9994 | then | |
702d2020 AC |
9995 | -- We examine the formals and result type of the inherited operation, |
9996 | -- to determine whether their type is derived from (the instance of) | |
9997 | -- a generic type. The first such formal or result type is the one | |
9998 | -- tested. | |
996ae0b0 RK |
9999 | |
10000 | Formal := First_Formal (Prev_E); | |
ae4c4d53 | 10001 | F_Typ := Empty; |
996ae0b0 RK |
10002 | while Present (Formal) loop |
10003 | F_Typ := Base_Type (Etype (Formal)); | |
10004 | ||
10005 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
10006 | F_Typ := Designated_Type (F_Typ); | |
10007 | end if; | |
10008 | ||
10009 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 10010 | exit when Present (G_Typ); |
996ae0b0 RK |
10011 | |
10012 | Next_Formal (Formal); | |
10013 | end loop; | |
10014 | ||
890975e3 | 10015 | -- If the function dispatches on result check the result type |
ae4c4d53 | 10016 | |
c8ef728f | 10017 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
10018 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
10019 | end if; | |
10020 | ||
10021 | if No (G_Typ) then | |
10022 | return False; | |
10023 | end if; | |
10024 | ||
8dbd1460 AC |
10025 | -- If the generic type is a private type, then the original operation |
10026 | -- was not overriding in the generic, because there was no primitive | |
10027 | -- operation to override. | |
996ae0b0 RK |
10028 | |
10029 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
10030 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 10031 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
10032 | then |
10033 | return True; | |
10034 | ||
10035 | -- The generic parent type is the ancestor of a formal derived | |
10036 | -- type declaration. We need to check whether it has a primitive | |
10037 | -- operation that should be overridden by New_E in the generic. | |
10038 | ||
10039 | else | |
10040 | declare | |
10041 | P_Formal : Entity_Id; | |
10042 | N_Formal : Entity_Id; | |
10043 | P_Typ : Entity_Id; | |
10044 | N_Typ : Entity_Id; | |
10045 | P_Prim : Entity_Id; | |
10046 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
10047 | ||
10048 | begin | |
10049 | while Present (Prim_Elt) loop | |
10050 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 10051 | |
996ae0b0 RK |
10052 | if Chars (P_Prim) = Chars (New_E) |
10053 | and then Ekind (P_Prim) = Ekind (New_E) | |
10054 | then | |
10055 | P_Formal := First_Formal (P_Prim); | |
10056 | N_Formal := First_Formal (New_E); | |
10057 | while Present (P_Formal) and then Present (N_Formal) loop | |
10058 | P_Typ := Etype (P_Formal); | |
10059 | N_Typ := Etype (N_Formal); | |
10060 | ||
10061 | if not Types_Correspond (P_Typ, N_Typ) then | |
10062 | exit; | |
10063 | end if; | |
10064 | ||
10065 | Next_Entity (P_Formal); | |
10066 | Next_Entity (N_Formal); | |
10067 | end loop; | |
10068 | ||
82c80734 RD |
10069 | -- Found a matching primitive operation belonging to the |
10070 | -- formal ancestor type, so the new subprogram is | |
10071 | -- overriding. | |
996ae0b0 | 10072 | |
c8ef728f ES |
10073 | if No (P_Formal) |
10074 | and then No (N_Formal) | |
996ae0b0 RK |
10075 | and then (Ekind (New_E) /= E_Function |
10076 | or else | |
8fde064e AC |
10077 | Types_Correspond |
10078 | (Etype (P_Prim), Etype (New_E))) | |
996ae0b0 RK |
10079 | then |
10080 | return False; | |
10081 | end if; | |
10082 | end if; | |
10083 | ||
10084 | Next_Elmt (Prim_Elt); | |
10085 | end loop; | |
10086 | ||
2995860f AC |
10087 | -- If no match found, then the new subprogram does not override |
10088 | -- in the generic (nor in the instance). | |
996ae0b0 | 10089 | |
260359e3 AC |
10090 | -- If the type in question is not abstract, and the subprogram |
10091 | -- is, this will be an error if the new operation is in the | |
10092 | -- private part of the instance. Emit a warning now, which will | |
10093 | -- make the subsequent error message easier to understand. | |
10094 | ||
ae4c4d53 | 10095 | if Present (F_Typ) and then not Is_Abstract_Type (F_Typ) |
260359e3 AC |
10096 | and then Is_Abstract_Subprogram (Prev_E) |
10097 | and then In_Private_Part (Current_Scope) | |
10098 | then | |
10099 | Error_Msg_Node_2 := F_Typ; | |
10100 | Error_Msg_NE | |
3ccedacc AC |
10101 | ("private operation& in generic unit does not override " |
10102 | & "any primitive operation of& (RM 12.3 (18))??", | |
260359e3 AC |
10103 | New_E, New_E); |
10104 | end if; | |
10105 | ||
996ae0b0 RK |
10106 | return True; |
10107 | end; | |
10108 | end if; | |
10109 | else | |
10110 | return False; | |
10111 | end if; | |
10112 | end Is_Non_Overriding_Operation; | |
10113 | ||
beacce02 AC |
10114 | ------------------------------------- |
10115 | -- List_Inherited_Pre_Post_Aspects -- | |
10116 | ------------------------------------- | |
10117 | ||
10118 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
10119 | begin | |
e606088a | 10120 | if Opt.List_Inherited_Aspects |
b9696ffb | 10121 | and then Is_Subprogram_Or_Generic_Subprogram (E) |
beacce02 AC |
10122 | then |
10123 | declare | |
c9d70ab1 AC |
10124 | Subps : constant Subprogram_List := Inherited_Subprograms (E); |
10125 | Items : Node_Id; | |
10126 | Prag : Node_Id; | |
beacce02 AC |
10127 | |
10128 | begin | |
c9d70ab1 AC |
10129 | for Index in Subps'Range loop |
10130 | Items := Contract (Subps (Index)); | |
10131 | ||
10132 | if Present (Items) then | |
10133 | Prag := Pre_Post_Conditions (Items); | |
10134 | while Present (Prag) loop | |
10135 | Error_Msg_Sloc := Sloc (Prag); | |
10136 | ||
10137 | if Class_Present (Prag) | |
10138 | and then not Split_PPC (Prag) | |
10139 | then | |
6e759c2a | 10140 | if Pragma_Name (Prag) = Name_Precondition then |
c9d70ab1 AC |
10141 | Error_Msg_N |
10142 | ("info: & inherits `Pre''Class` aspect from " | |
10143 | & "#?L?", E); | |
10144 | else | |
10145 | Error_Msg_N | |
10146 | ("info: & inherits `Post''Class` aspect from " | |
10147 | & "#?L?", E); | |
10148 | end if; | |
beacce02 | 10149 | end if; |
beacce02 | 10150 | |
c9d70ab1 AC |
10151 | Prag := Next_Pragma (Prag); |
10152 | end loop; | |
10153 | end if; | |
beacce02 AC |
10154 | end loop; |
10155 | end; | |
10156 | end if; | |
10157 | end List_Inherited_Pre_Post_Aspects; | |
10158 | ||
996ae0b0 RK |
10159 | ------------------------------ |
10160 | -- Make_Inequality_Operator -- | |
10161 | ------------------------------ | |
10162 | ||
10163 | -- S is the defining identifier of an equality operator. We build a | |
10164 | -- subprogram declaration with the right signature. This operation is | |
10165 | -- intrinsic, because it is always expanded as the negation of the | |
10166 | -- call to the equality function. | |
10167 | ||
10168 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
10169 | Loc : constant Source_Ptr := Sloc (S); | |
10170 | Decl : Node_Id; | |
10171 | Formals : List_Id; | |
10172 | Op_Name : Entity_Id; | |
10173 | ||
c8ef728f ES |
10174 | FF : constant Entity_Id := First_Formal (S); |
10175 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
10176 | |
10177 | begin | |
c8ef728f | 10178 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 10179 | |
c8ef728f | 10180 | if No (NF) then |
996ae0b0 RK |
10181 | return; |
10182 | end if; | |
10183 | ||
c8ef728f ES |
10184 | declare |
10185 | A : constant Entity_Id := | |
10186 | Make_Defining_Identifier (Sloc (FF), | |
10187 | Chars => Chars (FF)); | |
10188 | ||
5d37ba92 ES |
10189 | B : constant Entity_Id := |
10190 | Make_Defining_Identifier (Sloc (NF), | |
10191 | Chars => Chars (NF)); | |
c8ef728f ES |
10192 | |
10193 | begin | |
10194 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
10195 | ||
10196 | Formals := New_List ( | |
10197 | Make_Parameter_Specification (Loc, | |
10198 | Defining_Identifier => A, | |
10199 | Parameter_Type => | |
e4494292 | 10200 | New_Occurrence_Of (Etype (First_Formal (S)), |
c8ef728f ES |
10201 | Sloc (Etype (First_Formal (S))))), |
10202 | ||
10203 | Make_Parameter_Specification (Loc, | |
10204 | Defining_Identifier => B, | |
10205 | Parameter_Type => | |
e4494292 | 10206 | New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
c8ef728f ES |
10207 | Sloc (Etype (Next_Formal (First_Formal (S))))))); |
10208 | ||
10209 | Decl := | |
10210 | Make_Subprogram_Declaration (Loc, | |
10211 | Specification => | |
10212 | Make_Function_Specification (Loc, | |
10213 | Defining_Unit_Name => Op_Name, | |
10214 | Parameter_Specifications => Formals, | |
10215 | Result_Definition => | |
e4494292 | 10216 | New_Occurrence_Of (Standard_Boolean, Loc))); |
c8ef728f ES |
10217 | |
10218 | -- Insert inequality right after equality if it is explicit or after | |
10219 | -- the derived type when implicit. These entities are created only | |
2995860f AC |
10220 | -- for visibility purposes, and eventually replaced in the course |
10221 | -- of expansion, so they do not need to be attached to the tree and | |
10222 | -- seen by the back-end. Keeping them internal also avoids spurious | |
c8ef728f ES |
10223 | -- freezing problems. The declaration is inserted in the tree for |
10224 | -- analysis, and removed afterwards. If the equality operator comes | |
10225 | -- from an explicit declaration, attach the inequality immediately | |
10226 | -- after. Else the equality is inherited from a derived type | |
10227 | -- declaration, so insert inequality after that declaration. | |
10228 | ||
10229 | if No (Alias (S)) then | |
10230 | Insert_After (Unit_Declaration_Node (S), Decl); | |
10231 | elsif Is_List_Member (Parent (S)) then | |
10232 | Insert_After (Parent (S), Decl); | |
10233 | else | |
10234 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
10235 | end if; | |
996ae0b0 | 10236 | |
c8ef728f ES |
10237 | Mark_Rewrite_Insertion (Decl); |
10238 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
10239 | Analyze (Decl); | |
10240 | Remove (Decl); | |
10241 | Set_Has_Completion (Op_Name); | |
10242 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 10243 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 10244 | end; |
996ae0b0 RK |
10245 | end Make_Inequality_Operator; |
10246 | ||
10247 | ---------------------- | |
10248 | -- May_Need_Actuals -- | |
10249 | ---------------------- | |
10250 | ||
10251 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
10252 | F : Entity_Id; | |
10253 | B : Boolean; | |
10254 | ||
10255 | begin | |
10256 | F := First_Formal (Fun); | |
10257 | B := True; | |
996ae0b0 RK |
10258 | while Present (F) loop |
10259 | if No (Default_Value (F)) then | |
10260 | B := False; | |
10261 | exit; | |
10262 | end if; | |
10263 | ||
10264 | Next_Formal (F); | |
10265 | end loop; | |
10266 | ||
10267 | Set_Needs_No_Actuals (Fun, B); | |
10268 | end May_Need_Actuals; | |
10269 | ||
10270 | --------------------- | |
10271 | -- Mode_Conformant -- | |
10272 | --------------------- | |
10273 | ||
10274 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
10275 | Result : Boolean; | |
996ae0b0 RK |
10276 | begin |
10277 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
10278 | return Result; | |
10279 | end Mode_Conformant; | |
10280 | ||
10281 | --------------------------- | |
10282 | -- New_Overloaded_Entity -- | |
10283 | --------------------------- | |
10284 | ||
10285 | procedure New_Overloaded_Entity | |
10286 | (S : Entity_Id; | |
10287 | Derived_Type : Entity_Id := Empty) | |
10288 | is | |
ec4867fa | 10289 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
10290 | -- Set if the current scope has an operation that is type-conformant |
10291 | -- with S, and becomes hidden by S. | |
10292 | ||
5d37ba92 ES |
10293 | Is_Primitive_Subp : Boolean; |
10294 | -- Set to True if the new subprogram is primitive | |
10295 | ||
fbf5a39b AC |
10296 | E : Entity_Id; |
10297 | -- Entity that S overrides | |
10298 | ||
5d37ba92 ES |
10299 | procedure Check_For_Primitive_Subprogram |
10300 | (Is_Primitive : out Boolean; | |
10301 | Is_Overriding : Boolean := False); | |
10302 | -- If the subprogram being analyzed is a primitive operation of the type | |
10303 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
10304 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
10305 | -- corresponding flag on the entity itself for later use. | |
10306 | ||
42f11e4c AC |
10307 | function Has_Matching_Entry_Or_Subprogram (E : Entity_Id) return Boolean; |
10308 | -- True if a) E is a subprogram whose first formal is a concurrent type | |
10309 | -- defined in the scope of E that has some entry or subprogram whose | |
10310 | -- profile matches E, or b) E is an internally built dispatching | |
10311 | -- subprogram of a protected type and there is a matching subprogram | |
10312 | -- defined in the enclosing scope of the protected type, or c) E is | |
10313 | -- an entry of a synchronized type and a matching procedure has been | |
10314 | -- previously defined in the enclosing scope of the synchronized type. | |
758c442c | 10315 | |
996ae0b0 RK |
10316 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
10317 | -- Check that E is declared in the private part of the current package, | |
10318 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 10319 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
10320 | -- set when freezing entities, so we must examine the place of the |
10321 | -- declaration in the tree, and recognize wrapper packages as well. | |
10322 | ||
2ddc2000 AC |
10323 | function Is_Overriding_Alias |
10324 | (Old_E : Entity_Id; | |
10325 | New_E : Entity_Id) return Boolean; | |
10326 | -- Check whether new subprogram and old subprogram are both inherited | |
10327 | -- from subprograms that have distinct dispatch table entries. This can | |
2995860f AC |
10328 | -- occur with derivations from instances with accidental homonyms. The |
10329 | -- function is conservative given that the converse is only true within | |
10330 | -- instances that contain accidental overloadings. | |
2ddc2000 | 10331 | |
42f11e4c | 10332 | procedure Report_Conflict (S : Entity_Id; E : Entity_Id); |
ca90b962 | 10333 | -- Report conflict between entities S and E |
42f11e4c | 10334 | |
5d37ba92 ES |
10335 | ------------------------------------ |
10336 | -- Check_For_Primitive_Subprogram -- | |
10337 | ------------------------------------ | |
996ae0b0 | 10338 | |
5d37ba92 ES |
10339 | procedure Check_For_Primitive_Subprogram |
10340 | (Is_Primitive : out Boolean; | |
10341 | Is_Overriding : Boolean := False) | |
ec4867fa | 10342 | is |
996ae0b0 RK |
10343 | Formal : Entity_Id; |
10344 | F_Typ : Entity_Id; | |
07fc65c4 | 10345 | B_Typ : Entity_Id; |
996ae0b0 RK |
10346 | |
10347 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
10348 | -- Returns true if T is declared in the visible part of the current |
10349 | -- package scope; otherwise returns false. Assumes that T is declared | |
10350 | -- in a package. | |
996ae0b0 RK |
10351 | |
10352 | procedure Check_Private_Overriding (T : Entity_Id); | |
10353 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
10354 | -- abstract type is declared in a private part, then it must override |
10355 | -- an abstract subprogram declared in the visible part. Also checks | |
10356 | -- that if a primitive function with a controlling result is declared | |
10357 | -- in a private part, then it must override a function declared in | |
10358 | -- the visible part. | |
996ae0b0 RK |
10359 | |
10360 | ------------------------------ | |
10361 | -- Check_Private_Overriding -- | |
10362 | ------------------------------ | |
10363 | ||
10364 | procedure Check_Private_Overriding (T : Entity_Id) is | |
6672e402 AC |
10365 | function Overrides_Private_Part_Op return Boolean; |
10366 | -- This detects the special case where the overriding subprogram | |
10367 | -- is overriding a subprogram that was declared in the same | |
10368 | -- private part. That case is illegal by 3.9.3(10). | |
acf624f2 | 10369 | |
aaeb3b3a AC |
10370 | function Overrides_Visible_Function |
10371 | (Partial_View : Entity_Id) return Boolean; | |
acf624f2 BD |
10372 | -- True if S overrides a function in the visible part. The |
10373 | -- overridden function could be explicitly or implicitly declared. | |
10374 | ||
6672e402 AC |
10375 | ------------------------------- |
10376 | -- Overrides_Private_Part_Op -- | |
10377 | ------------------------------- | |
10378 | ||
10379 | function Overrides_Private_Part_Op return Boolean is | |
10380 | Over_Decl : constant Node_Id := | |
10381 | Unit_Declaration_Node (Overridden_Operation (S)); | |
10382 | Subp_Decl : constant Node_Id := Unit_Declaration_Node (S); | |
10383 | ||
10384 | begin | |
10385 | pragma Assert (Is_Overriding); | |
10386 | pragma Assert | |
10387 | (Nkind (Over_Decl) = N_Abstract_Subprogram_Declaration); | |
10388 | pragma Assert | |
10389 | (Nkind (Subp_Decl) = N_Abstract_Subprogram_Declaration); | |
10390 | ||
10391 | return In_Same_List (Over_Decl, Subp_Decl); | |
10392 | end Overrides_Private_Part_Op; | |
10393 | ||
10394 | -------------------------------- | |
10395 | -- Overrides_Visible_Function -- | |
10396 | -------------------------------- | |
bc38dbb4 | 10397 | |
aaeb3b3a AC |
10398 | function Overrides_Visible_Function |
10399 | (Partial_View : Entity_Id) return Boolean | |
10400 | is | |
acf624f2 BD |
10401 | begin |
10402 | if not Is_Overriding or else not Has_Homonym (S) then | |
10403 | return False; | |
10404 | end if; | |
10405 | ||
aaeb3b3a | 10406 | if not Present (Partial_View) then |
acf624f2 BD |
10407 | return True; |
10408 | end if; | |
10409 | ||
10410 | -- Search through all the homonyms H of S in the current | |
10411 | -- package spec, and return True if we find one that matches. | |
10412 | -- Note that Parent (H) will be the declaration of the | |
aaeb3b3a | 10413 | -- partial view of T for a match. |
acf624f2 BD |
10414 | |
10415 | declare | |
10416 | H : Entity_Id := S; | |
10417 | begin | |
10418 | loop | |
10419 | H := Homonym (H); | |
10420 | exit when not Present (H) or else Scope (H) /= Scope (S); | |
10421 | ||
10422 | if Nkind_In | |
10423 | (Parent (H), | |
10424 | N_Private_Extension_Declaration, | |
10425 | N_Private_Type_Declaration) | |
aaeb3b3a | 10426 | and then Defining_Identifier (Parent (H)) = Partial_View |
acf624f2 BD |
10427 | then |
10428 | return True; | |
10429 | end if; | |
10430 | end loop; | |
10431 | end; | |
10432 | ||
10433 | return False; | |
10434 | end Overrides_Visible_Function; | |
10435 | ||
10436 | -- Start of processing for Check_Private_Overriding | |
10437 | ||
996ae0b0 | 10438 | begin |
51c16e29 | 10439 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
10440 | and then In_Private_Part (Current_Scope) |
10441 | and then Visible_Part_Type (T) | |
10442 | and then not In_Instance | |
10443 | then | |
f937473f RD |
10444 | if Is_Abstract_Type (T) |
10445 | and then Is_Abstract_Subprogram (S) | |
10446 | and then (not Is_Overriding | |
bc38dbb4 | 10447 | or else not Is_Abstract_Subprogram (E) |
6672e402 | 10448 | or else Overrides_Private_Part_Op) |
996ae0b0 | 10449 | then |
6672e402 AC |
10450 | Error_Msg_N |
10451 | ("abstract subprograms must be visible (RM 3.9.3(10))!", | |
10452 | S); | |
758c442c | 10453 | |
aaeb3b3a AC |
10454 | elsif Ekind (S) = E_Function then |
10455 | declare | |
10456 | Partial_View : constant Entity_Id := | |
10457 | Incomplete_Or_Partial_View (T); | |
2e79de51 | 10458 | |
aaeb3b3a AC |
10459 | begin |
10460 | if not Overrides_Visible_Function (Partial_View) then | |
10461 | ||
10462 | -- Here, S is "function ... return T;" declared in | |
10463 | -- the private part, not overriding some visible | |
64ac53f4 | 10464 | -- operation. That's illegal in the tagged case |
aaeb3b3a AC |
10465 | -- (but not if the private type is untagged). |
10466 | ||
10467 | if ((Present (Partial_View) | |
10468 | and then Is_Tagged_Type (Partial_View)) | |
10469 | or else (not Present (Partial_View) | |
10470 | and then Is_Tagged_Type (T))) | |
10471 | and then T = Base_Type (Etype (S)) | |
10472 | then | |
10473 | Error_Msg_N | |
10474 | ("private function with tagged result must" | |
10475 | & " override visible-part function", S); | |
10476 | Error_Msg_N | |
10477 | ("\move subprogram to the visible part" | |
10478 | & " (RM 3.9.3(10))", S); | |
10479 | ||
10480 | -- AI05-0073: extend this test to the case of a | |
10481 | -- function with a controlling access result. | |
10482 | ||
10483 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
10484 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
10485 | and then | |
10486 | not Is_Class_Wide_Type | |
10487 | (Designated_Type (Etype (S))) | |
10488 | and then Ada_Version >= Ada_2012 | |
10489 | then | |
10490 | Error_Msg_N | |
10491 | ("private function with controlling access " | |
10492 | & "result must override visible-part function", | |
10493 | S); | |
10494 | Error_Msg_N | |
10495 | ("\move subprogram to the visible part" | |
10496 | & " (RM 3.9.3(10))", S); | |
10497 | end if; | |
10498 | end if; | |
10499 | end; | |
996ae0b0 RK |
10500 | end if; |
10501 | end if; | |
10502 | end Check_Private_Overriding; | |
10503 | ||
10504 | ----------------------- | |
10505 | -- Visible_Part_Type -- | |
10506 | ----------------------- | |
10507 | ||
10508 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 | 10509 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
996ae0b0 RK |
10510 | |
10511 | begin | |
8dbd1460 AC |
10512 | -- If the entity is a private type, then it must be declared in a |
10513 | -- visible part. | |
996ae0b0 RK |
10514 | |
10515 | if Ekind (T) in Private_Kind then | |
10516 | return True; | |
996ae0b0 | 10517 | |
3e5400f4 PMR |
10518 | elsif Is_Type (T) and then Has_Private_Declaration (T) then |
10519 | return True; | |
996ae0b0 | 10520 | |
3e5400f4 PMR |
10521 | elsif Is_List_Member (Declaration_Node (T)) |
10522 | and then List_Containing (Declaration_Node (T)) = | |
10523 | Visible_Declarations (Specification (P)) | |
10524 | then | |
10525 | return True; | |
996ae0b0 | 10526 | |
3e5400f4 PMR |
10527 | else |
10528 | return False; | |
10529 | end if; | |
996ae0b0 RK |
10530 | end Visible_Part_Type; |
10531 | ||
5d37ba92 | 10532 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
10533 | |
10534 | begin | |
5d37ba92 ES |
10535 | Is_Primitive := False; |
10536 | ||
996ae0b0 RK |
10537 | if not Comes_From_Source (S) then |
10538 | null; | |
10539 | ||
5d37ba92 | 10540 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
10541 | |
10542 | elsif Current_Scope = Standard_Standard then | |
10543 | null; | |
10544 | ||
b9b2405f | 10545 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 10546 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 10547 | or else Is_Overriding |
996ae0b0 | 10548 | then |
07fc65c4 | 10549 | -- For function, check return type |
996ae0b0 | 10550 | |
07fc65c4 | 10551 | if Ekind (S) = E_Function then |
5d37ba92 ES |
10552 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
10553 | F_Typ := Designated_Type (Etype (S)); | |
10554 | else | |
10555 | F_Typ := Etype (S); | |
10556 | end if; | |
10557 | ||
10558 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 10559 | |
5d37ba92 ES |
10560 | if Scope (B_Typ) = Current_Scope |
10561 | and then not Is_Class_Wide_Type (B_Typ) | |
10562 | and then not Is_Generic_Type (B_Typ) | |
10563 | then | |
10564 | Is_Primitive := True; | |
07fc65c4 | 10565 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 10566 | Set_Is_Primitive (S); |
07fc65c4 | 10567 | Check_Private_Overriding (B_Typ); |
4179af27 | 10568 | |
d65a80fd HK |
10569 | -- The Ghost policy in effect at the point of declaration |
10570 | -- or a tagged type and a primitive operation must match | |
4179af27 HK |
10571 | -- (SPARK RM 6.9(16)). |
10572 | ||
10573 | Check_Ghost_Primitive (S, B_Typ); | |
07fc65c4 | 10574 | end if; |
996ae0b0 RK |
10575 | end if; |
10576 | ||
07fc65c4 | 10577 | -- For all subprograms, check formals |
996ae0b0 | 10578 | |
07fc65c4 | 10579 | Formal := First_Formal (S); |
996ae0b0 RK |
10580 | while Present (Formal) loop |
10581 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
10582 | F_Typ := Designated_Type (Etype (Formal)); | |
10583 | else | |
10584 | F_Typ := Etype (Formal); | |
10585 | end if; | |
10586 | ||
07fc65c4 GB |
10587 | B_Typ := Base_Type (F_Typ); |
10588 | ||
ec4867fa ES |
10589 | if Ekind (B_Typ) = E_Access_Subtype then |
10590 | B_Typ := Base_Type (B_Typ); | |
10591 | end if; | |
10592 | ||
5d37ba92 ES |
10593 | if Scope (B_Typ) = Current_Scope |
10594 | and then not Is_Class_Wide_Type (B_Typ) | |
10595 | and then not Is_Generic_Type (B_Typ) | |
10596 | then | |
10597 | Is_Primitive := True; | |
10598 | Set_Is_Primitive (S); | |
07fc65c4 GB |
10599 | Set_Has_Primitive_Operations (B_Typ); |
10600 | Check_Private_Overriding (B_Typ); | |
4179af27 | 10601 | |
d65a80fd HK |
10602 | -- The Ghost policy in effect at the point of declaration |
10603 | -- of a tagged type and a primitive operation must match | |
4179af27 HK |
10604 | -- (SPARK RM 6.9(16)). |
10605 | ||
10606 | Check_Ghost_Primitive (S, B_Typ); | |
996ae0b0 RK |
10607 | end if; |
10608 | ||
10609 | Next_Formal (Formal); | |
10610 | end loop; | |
1aee1fb3 AC |
10611 | |
10612 | -- Special case: An equality function can be redefined for a type | |
10613 | -- occurring in a declarative part, and won't otherwise be treated as | |
10614 | -- a primitive because it doesn't occur in a package spec and doesn't | |
10615 | -- override an inherited subprogram. It's important that we mark it | |
10616 | -- primitive so it can be returned by Collect_Primitive_Operations | |
10617 | -- and be used in composing the equality operation of later types | |
10618 | -- that have a component of the type. | |
10619 | ||
10620 | elsif Chars (S) = Name_Op_Eq | |
10621 | and then Etype (S) = Standard_Boolean | |
10622 | then | |
10623 | B_Typ := Base_Type (Etype (First_Formal (S))); | |
10624 | ||
10625 | if Scope (B_Typ) = Current_Scope | |
10626 | and then | |
10627 | Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ | |
10628 | and then not Is_Limited_Type (B_Typ) | |
10629 | then | |
10630 | Is_Primitive := True; | |
10631 | Set_Is_Primitive (S); | |
10632 | Set_Has_Primitive_Operations (B_Typ); | |
10633 | Check_Private_Overriding (B_Typ); | |
4179af27 HK |
10634 | |
10635 | -- The Ghost policy in effect at the point of declaration of a | |
10636 | -- tagged type and a primitive operation must match | |
10637 | -- (SPARK RM 6.9(16)). | |
10638 | ||
10639 | Check_Ghost_Primitive (S, B_Typ); | |
1aee1fb3 | 10640 | end if; |
996ae0b0 | 10641 | end if; |
5d37ba92 ES |
10642 | end Check_For_Primitive_Subprogram; |
10643 | ||
42f11e4c AC |
10644 | -------------------------------------- |
10645 | -- Has_Matching_Entry_Or_Subprogram -- | |
10646 | -------------------------------------- | |
5d37ba92 | 10647 | |
bac5ba15 AC |
10648 | function Has_Matching_Entry_Or_Subprogram |
10649 | (E : Entity_Id) return Boolean | |
5d37ba92 | 10650 | is |
42f11e4c AC |
10651 | function Check_Conforming_Parameters |
10652 | (E1_Param : Node_Id; | |
97b2ffb8 SB |
10653 | E2_Param : Node_Id; |
10654 | Ctype : Conformance_Type) return Boolean; | |
42f11e4c | 10655 | -- Starting from the given parameters, check that all the parameters |
97b2ffb8 | 10656 | -- of two entries or subprograms are conformant. Used to skip |
ca90b962 | 10657 | -- the check on the controlling argument. |
42f11e4c AC |
10658 | |
10659 | function Matching_Entry_Or_Subprogram | |
10660 | (Conc_Typ : Entity_Id; | |
10661 | Subp : Entity_Id) return Entity_Id; | |
10662 | -- Return the first entry or subprogram of the given concurrent type | |
10663 | -- whose name matches the name of Subp and has a profile conformant | |
10664 | -- with Subp; return Empty if not found. | |
10665 | ||
10666 | function Matching_Dispatching_Subprogram | |
10667 | (Conc_Typ : Entity_Id; | |
10668 | Ent : Entity_Id) return Entity_Id; | |
10669 | -- Return the first dispatching primitive of Conc_Type defined in the | |
ca90b962 | 10670 | -- enclosing scope of Conc_Type (i.e. before the full definition of |
42f11e4c AC |
10671 | -- this concurrent type) whose name matches the entry Ent and has a |
10672 | -- profile conformant with the profile of the corresponding (not yet | |
10673 | -- built) dispatching primitive of Ent; return Empty if not found. | |
10674 | ||
10675 | function Matching_Original_Protected_Subprogram | |
10676 | (Prot_Typ : Entity_Id; | |
10677 | Subp : Entity_Id) return Entity_Id; | |
10678 | -- Return the first subprogram defined in the enclosing scope of | |
10679 | -- Prot_Typ (before the full definition of this protected type) | |
10680 | -- whose name matches the original name of Subp and has a profile | |
10681 | -- conformant with the profile of Subp; return Empty if not found. | |
10682 | ||
97b2ffb8 SB |
10683 | function Normalized_First_Parameter_Type |
10684 | (E : Entity_Id) return Entity_Id; | |
10685 | -- Return the type of the first parameter unless that type | |
10686 | -- is an anonymous access type, in which case return the | |
10687 | -- designated type. Used to treat anonymous-access-to-synchronized | |
10688 | -- the same as synchronized for purposes of checking for | |
10689 | -- prefixed view profile conflicts. | |
10690 | ||
42f11e4c | 10691 | --------------------------------- |
8016e567 | 10692 | -- Check_Conforming_Parameters -- |
42f11e4c AC |
10693 | --------------------------------- |
10694 | ||
10695 | function Check_Conforming_Parameters | |
10696 | (E1_Param : Node_Id; | |
97b2ffb8 SB |
10697 | E2_Param : Node_Id; |
10698 | Ctype : Conformance_Type) return Boolean | |
8aa15e3b | 10699 | is |
42f11e4c AC |
10700 | Param_E1 : Node_Id := E1_Param; |
10701 | Param_E2 : Node_Id := E2_Param; | |
8aa15e3b JM |
10702 | |
10703 | begin | |
42f11e4c | 10704 | while Present (Param_E1) and then Present (Param_E2) loop |
97b2ffb8 SB |
10705 | if (Ctype >= Mode_Conformant) and then |
10706 | Ekind (Defining_Identifier (Param_E1)) /= | |
10707 | Ekind (Defining_Identifier (Param_E2)) | |
10708 | then | |
10709 | return False; | |
10710 | elsif not | |
bac5ba15 AC |
10711 | Conforming_Types |
10712 | (Find_Parameter_Type (Param_E1), | |
10713 | Find_Parameter_Type (Param_E2), | |
97b2ffb8 | 10714 | Ctype) |
15e4986c | 10715 | then |
42f11e4c | 10716 | return False; |
8aa15e3b JM |
10717 | end if; |
10718 | ||
42f11e4c AC |
10719 | Next (Param_E1); |
10720 | Next (Param_E2); | |
10721 | end loop; | |
8aa15e3b | 10722 | |
42f11e4c AC |
10723 | -- The candidate is not valid if one of the two lists contains |
10724 | -- more parameters than the other | |
8aa15e3b | 10725 | |
42f11e4c AC |
10726 | return No (Param_E1) and then No (Param_E2); |
10727 | end Check_Conforming_Parameters; | |
8aa15e3b | 10728 | |
42f11e4c AC |
10729 | ---------------------------------- |
10730 | -- Matching_Entry_Or_Subprogram -- | |
10731 | ---------------------------------- | |
8aa15e3b | 10732 | |
42f11e4c AC |
10733 | function Matching_Entry_Or_Subprogram |
10734 | (Conc_Typ : Entity_Id; | |
10735 | Subp : Entity_Id) return Entity_Id | |
10736 | is | |
10737 | E : Entity_Id; | |
8aa15e3b | 10738 | |
42f11e4c AC |
10739 | begin |
10740 | E := First_Entity (Conc_Typ); | |
10741 | while Present (E) loop | |
10742 | if Chars (Subp) = Chars (E) | |
10743 | and then (Ekind (E) = E_Entry or else Is_Subprogram (E)) | |
10744 | and then | |
10745 | Check_Conforming_Parameters | |
10746 | (First (Parameter_Specifications (Parent (E))), | |
97b2ffb8 SB |
10747 | Next (First (Parameter_Specifications (Parent (Subp)))), |
10748 | Type_Conformant) | |
8aa15e3b | 10749 | then |
42f11e4c | 10750 | return E; |
8aa15e3b JM |
10751 | end if; |
10752 | ||
42f11e4c | 10753 | Next_Entity (E); |
8aa15e3b JM |
10754 | end loop; |
10755 | ||
42f11e4c AC |
10756 | return Empty; |
10757 | end Matching_Entry_Or_Subprogram; | |
8aa15e3b | 10758 | |
42f11e4c AC |
10759 | ------------------------------------- |
10760 | -- Matching_Dispatching_Subprogram -- | |
10761 | ------------------------------------- | |
8aa15e3b | 10762 | |
42f11e4c AC |
10763 | function Matching_Dispatching_Subprogram |
10764 | (Conc_Typ : Entity_Id; | |
10765 | Ent : Entity_Id) return Entity_Id | |
10766 | is | |
10767 | E : Entity_Id; | |
8aa15e3b | 10768 | |
42f11e4c AC |
10769 | begin |
10770 | -- Search for entities in the enclosing scope of this synchonized | |
bac5ba15 | 10771 | -- type. |
8aa15e3b | 10772 | |
42f11e4c AC |
10773 | pragma Assert (Is_Concurrent_Type (Conc_Typ)); |
10774 | Push_Scope (Scope (Conc_Typ)); | |
10775 | E := Current_Entity_In_Scope (Ent); | |
10776 | Pop_Scope; | |
5d37ba92 | 10777 | |
42f11e4c AC |
10778 | while Present (E) loop |
10779 | if Scope (E) = Scope (Conc_Typ) | |
10780 | and then Comes_From_Source (E) | |
10781 | and then Ekind (E) = E_Procedure | |
10782 | and then Present (First_Entity (E)) | |
10783 | and then Is_Controlling_Formal (First_Entity (E)) | |
10784 | and then Etype (First_Entity (E)) = Conc_Typ | |
10785 | and then | |
10786 | Check_Conforming_Parameters | |
10787 | (First (Parameter_Specifications (Parent (Ent))), | |
97b2ffb8 SB |
10788 | Next (First (Parameter_Specifications (Parent (E)))), |
10789 | Subtype_Conformant) | |
42f11e4c AC |
10790 | then |
10791 | return E; | |
10792 | end if; | |
5d37ba92 | 10793 | |
42f11e4c AC |
10794 | E := Homonym (E); |
10795 | end loop; | |
5d37ba92 | 10796 | |
42f11e4c AC |
10797 | return Empty; |
10798 | end Matching_Dispatching_Subprogram; | |
5d37ba92 | 10799 | |
42f11e4c AC |
10800 | -------------------------------------------- |
10801 | -- Matching_Original_Protected_Subprogram -- | |
10802 | -------------------------------------------- | |
5d37ba92 | 10803 | |
42f11e4c AC |
10804 | function Matching_Original_Protected_Subprogram |
10805 | (Prot_Typ : Entity_Id; | |
10806 | Subp : Entity_Id) return Entity_Id | |
10807 | is | |
10808 | ICF : constant Boolean := | |
10809 | Is_Controlling_Formal (First_Entity (Subp)); | |
10810 | E : Entity_Id; | |
8aa15e3b | 10811 | |
42f11e4c AC |
10812 | begin |
10813 | -- Temporarily decorate the first parameter of Subp as controlling | |
bac5ba15 | 10814 | -- formal, required to invoke Subtype_Conformant. |
5d37ba92 | 10815 | |
42f11e4c | 10816 | Set_Is_Controlling_Formal (First_Entity (Subp)); |
5d37ba92 | 10817 | |
42f11e4c AC |
10818 | E := |
10819 | Current_Entity_In_Scope (Original_Protected_Subprogram (Subp)); | |
8aa15e3b | 10820 | |
42f11e4c AC |
10821 | while Present (E) loop |
10822 | if Scope (E) = Scope (Prot_Typ) | |
10823 | and then Comes_From_Source (E) | |
10824 | and then Ekind (Subp) = Ekind (E) | |
10825 | and then Present (First_Entity (E)) | |
10826 | and then Is_Controlling_Formal (First_Entity (E)) | |
10827 | and then Etype (First_Entity (E)) = Prot_Typ | |
10828 | and then Subtype_Conformant (Subp, E, | |
10829 | Skip_Controlling_Formals => True) | |
10830 | then | |
10831 | Set_Is_Controlling_Formal (First_Entity (Subp), ICF); | |
10832 | return E; | |
10833 | end if; | |
8c3dd7a8 | 10834 | |
42f11e4c AC |
10835 | E := Homonym (E); |
10836 | end loop; | |
5d37ba92 | 10837 | |
42f11e4c | 10838 | Set_Is_Controlling_Formal (First_Entity (Subp), ICF); |
bac5ba15 | 10839 | |
42f11e4c AC |
10840 | return Empty; |
10841 | end Matching_Original_Protected_Subprogram; | |
5d37ba92 | 10842 | |
97b2ffb8 SB |
10843 | ------------------------------------- |
10844 | -- Normalized_First_Parameter_Type -- | |
10845 | ------------------------------------- | |
10846 | ||
10847 | function Normalized_First_Parameter_Type | |
10848 | (E : Entity_Id) return Entity_Id | |
10849 | is | |
10850 | Result : Entity_Id := Etype (First_Entity (E)); | |
10851 | begin | |
10852 | if Ekind (Result) = E_Anonymous_Access_Type then | |
10853 | Result := Designated_Type (Result); | |
10854 | end if; | |
10855 | return Result; | |
10856 | end Normalized_First_Parameter_Type; | |
10857 | ||
42f11e4c | 10858 | -- Start of processing for Has_Matching_Entry_Or_Subprogram |
5d37ba92 | 10859 | |
42f11e4c AC |
10860 | begin |
10861 | -- Case 1: E is a subprogram whose first formal is a concurrent type | |
10862 | -- defined in the scope of E that has an entry or subprogram whose | |
10863 | -- profile matches E. | |
10864 | ||
10865 | if Comes_From_Source (E) | |
10866 | and then Is_Subprogram (E) | |
10867 | and then Present (First_Entity (E)) | |
97b2ffb8 SB |
10868 | and then Is_Concurrent_Record_Type |
10869 | (Normalized_First_Parameter_Type (E)) | |
42f11e4c AC |
10870 | then |
10871 | if Scope (E) = | |
bac5ba15 | 10872 | Scope (Corresponding_Concurrent_Type |
97b2ffb8 | 10873 | (Normalized_First_Parameter_Type (E))) |
42f11e4c AC |
10874 | and then |
10875 | Present | |
10876 | (Matching_Entry_Or_Subprogram | |
97b2ffb8 SB |
10877 | (Corresponding_Concurrent_Type |
10878 | (Normalized_First_Parameter_Type (E)), | |
42f11e4c AC |
10879 | Subp => E)) |
10880 | then | |
10881 | Report_Conflict (E, | |
10882 | Matching_Entry_Or_Subprogram | |
97b2ffb8 SB |
10883 | (Corresponding_Concurrent_Type |
10884 | (Normalized_First_Parameter_Type (E)), | |
42f11e4c AC |
10885 | Subp => E)); |
10886 | return True; | |
5d37ba92 | 10887 | end if; |
8aa15e3b | 10888 | |
42f11e4c AC |
10889 | -- Case 2: E is an internally built dispatching subprogram of a |
10890 | -- protected type and there is a subprogram defined in the enclosing | |
10891 | -- scope of the protected type that has the original name of E and | |
10892 | -- its profile is conformant with the profile of E. We check the | |
10893 | -- name of the original protected subprogram associated with E since | |
10894 | -- the expander builds dispatching primitives of protected functions | |
ca90b962 | 10895 | -- and procedures with other names (see Exp_Ch9.Build_Selected_Name). |
42f11e4c AC |
10896 | |
10897 | elsif not Comes_From_Source (E) | |
10898 | and then Is_Subprogram (E) | |
10899 | and then Present (First_Entity (E)) | |
10900 | and then Is_Concurrent_Record_Type (Etype (First_Entity (E))) | |
10901 | and then Present (Original_Protected_Subprogram (E)) | |
10902 | and then | |
10903 | Present | |
10904 | (Matching_Original_Protected_Subprogram | |
bac5ba15 AC |
10905 | (Corresponding_Concurrent_Type (Etype (First_Entity (E))), |
10906 | Subp => E)) | |
42f11e4c AC |
10907 | then |
10908 | Report_Conflict (E, | |
10909 | Matching_Original_Protected_Subprogram | |
10910 | (Corresponding_Concurrent_Type (Etype (First_Entity (E))), | |
10911 | Subp => E)); | |
10912 | return True; | |
8aa15e3b | 10913 | |
ca90b962 | 10914 | -- Case 3: E is an entry of a synchronized type and a matching |
42f11e4c | 10915 | -- procedure has been previously defined in the enclosing scope |
ca90b962 | 10916 | -- of the synchronized type. |
8aa15e3b | 10917 | |
42f11e4c AC |
10918 | elsif Comes_From_Source (E) |
10919 | and then Ekind (E) = E_Entry | |
10920 | and then | |
10921 | Present (Matching_Dispatching_Subprogram (Current_Scope, E)) | |
10922 | then | |
10923 | Report_Conflict (E, | |
10924 | Matching_Dispatching_Subprogram (Current_Scope, E)); | |
10925 | return True; | |
5d37ba92 ES |
10926 | end if; |
10927 | ||
42f11e4c AC |
10928 | return False; |
10929 | end Has_Matching_Entry_Or_Subprogram; | |
5d37ba92 ES |
10930 | |
10931 | ---------------------------- | |
10932 | -- Is_Private_Declaration -- | |
10933 | ---------------------------- | |
10934 | ||
10935 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
5d37ba92 | 10936 | Decl : constant Node_Id := Unit_Declaration_Node (E); |
bac5ba15 | 10937 | Priv_Decls : List_Id; |
5d37ba92 ES |
10938 | |
10939 | begin | |
10940 | if Is_Package_Or_Generic_Package (Current_Scope) | |
10941 | and then In_Private_Part (Current_Scope) | |
10942 | then | |
10943 | Priv_Decls := | |
d12b19fa | 10944 | Private_Declarations (Package_Specification (Current_Scope)); |
5d37ba92 ES |
10945 | |
10946 | return In_Package_Body (Current_Scope) | |
10947 | or else | |
10948 | (Is_List_Member (Decl) | |
a4901c08 | 10949 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 10950 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
10951 | and then not |
10952 | Is_Compilation_Unit | |
10953 | (Defining_Entity (Parent (Decl))) | |
10954 | and then List_Containing (Parent (Parent (Decl))) = | |
10955 | Priv_Decls); | |
5d37ba92 ES |
10956 | else |
10957 | return False; | |
10958 | end if; | |
10959 | end Is_Private_Declaration; | |
996ae0b0 | 10960 | |
2ddc2000 AC |
10961 | -------------------------- |
10962 | -- Is_Overriding_Alias -- | |
10963 | -------------------------- | |
10964 | ||
10965 | function Is_Overriding_Alias | |
10966 | (Old_E : Entity_Id; | |
10967 | New_E : Entity_Id) return Boolean | |
10968 | is | |
10969 | AO : constant Entity_Id := Alias (Old_E); | |
10970 | AN : constant Entity_Id := Alias (New_E); | |
bac5ba15 | 10971 | |
2ddc2000 AC |
10972 | begin |
10973 | return Scope (AO) /= Scope (AN) | |
10974 | or else No (DTC_Entity (AO)) | |
10975 | or else No (DTC_Entity (AN)) | |
10976 | or else DT_Position (AO) = DT_Position (AN); | |
10977 | end Is_Overriding_Alias; | |
10978 | ||
42f11e4c AC |
10979 | --------------------- |
10980 | -- Report_Conflict -- | |
10981 | --------------------- | |
10982 | ||
10983 | procedure Report_Conflict (S : Entity_Id; E : Entity_Id) is | |
10984 | begin | |
10985 | Error_Msg_Sloc := Sloc (E); | |
10986 | ||
10987 | -- Generate message, with useful additional warning if in generic | |
10988 | ||
10989 | if Is_Generic_Unit (E) then | |
10990 | Error_Msg_N ("previous generic unit cannot be overloaded", S); | |
10991 | Error_Msg_N ("\& conflicts with declaration#", S); | |
10992 | else | |
10993 | Error_Msg_N ("& conflicts with declaration#", S); | |
10994 | end if; | |
10995 | end Report_Conflict; | |
10996 | ||
996ae0b0 RK |
10997 | -- Start of processing for New_Overloaded_Entity |
10998 | ||
10999 | begin | |
fbf5a39b AC |
11000 | -- We need to look for an entity that S may override. This must be a |
11001 | -- homonym in the current scope, so we look for the first homonym of | |
11002 | -- S in the current scope as the starting point for the search. | |
11003 | ||
11004 | E := Current_Entity_In_Scope (S); | |
11005 | ||
947430d5 AC |
11006 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
11007 | -- They are directly added to the list of primitive operations of | |
11008 | -- Derived_Type, unless this is a rederivation in the private part | |
11009 | -- of an operation that was already derived in the visible part of | |
11010 | -- the current package. | |
11011 | ||
0791fbe9 | 11012 | if Ada_Version >= Ada_2005 |
947430d5 AC |
11013 | and then Present (Derived_Type) |
11014 | and then Present (Alias (S)) | |
11015 | and then Is_Dispatching_Operation (Alias (S)) | |
11016 | and then Present (Find_Dispatching_Type (Alias (S))) | |
11017 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
11018 | then | |
11019 | -- For private types, when the full-view is processed we propagate to | |
11020 | -- the full view the non-overridden entities whose attribute "alias" | |
11021 | -- references an interface primitive. These entities were added by | |
11022 | -- Derive_Subprograms to ensure that interface primitives are | |
11023 | -- covered. | |
11024 | ||
11025 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
11026 | -- internal entity that links an interface primitive with its | |
11027 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 11028 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
11029 | |
11030 | if Inside_Freezing_Actions = 0 | |
11031 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
11032 | and then In_Private_Part (Current_Scope) | |
11033 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
11034 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
11035 | and then Full_View (Defining_Identifier (Parent (E))) | |
11036 | = Defining_Identifier (Parent (S)) | |
11037 | and then Alias (E) = Alias (S) | |
11038 | then | |
11039 | Check_Operation_From_Private_View (S, E); | |
11040 | Set_Is_Dispatching_Operation (S); | |
11041 | ||
11042 | -- Common case | |
11043 | ||
11044 | else | |
11045 | Enter_Overloaded_Entity (S); | |
11046 | Check_Dispatching_Operation (S, Empty); | |
11047 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
11048 | end if; | |
11049 | ||
11050 | return; | |
11051 | end if; | |
11052 | ||
ca90b962 GD |
11053 | -- For synchronized types check conflicts of this entity with previously |
11054 | -- defined entities. | |
42f11e4c AC |
11055 | |
11056 | if Ada_Version >= Ada_2005 | |
11057 | and then Has_Matching_Entry_Or_Subprogram (S) | |
11058 | then | |
11059 | return; | |
11060 | end if; | |
11061 | ||
fbf5a39b AC |
11062 | -- If there is no homonym then this is definitely not overriding |
11063 | ||
996ae0b0 RK |
11064 | if No (E) then |
11065 | Enter_Overloaded_Entity (S); | |
11066 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 11067 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 11068 | |
2995860f AC |
11069 | -- If subprogram has an explicit declaration, check whether it has an |
11070 | -- overriding indicator. | |
758c442c | 11071 | |
ec4867fa | 11072 | if Comes_From_Source (S) then |
8aa15e3b | 11073 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
11074 | |
11075 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
11076 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 11077 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
11078 | -- overriding indicator. |
11079 | ||
11080 | if Ada_Version >= Ada_2012 | |
11081 | and then No (Overridden_Subp) | |
11082 | and then Is_Dispatching_Operation (S) | |
038140ed | 11083 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
11084 | then |
11085 | Overridden_Subp := Overridden_Operation (S); | |
11086 | end if; | |
11087 | ||
5d37ba92 ES |
11088 | Check_Overriding_Indicator |
11089 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
241ebe89 HK |
11090 | |
11091 | -- The Ghost policy in effect at the point of declaration of a | |
11092 | -- parent subprogram and an overriding subprogram must match | |
11093 | -- (SPARK RM 6.9(17)). | |
11094 | ||
11095 | Check_Ghost_Overriding (S, Overridden_Subp); | |
758c442c GD |
11096 | end if; |
11097 | ||
fbf5a39b AC |
11098 | -- If there is a homonym that is not overloadable, then we have an |
11099 | -- error, except for the special cases checked explicitly below. | |
11100 | ||
996ae0b0 RK |
11101 | elsif not Is_Overloadable (E) then |
11102 | ||
11103 | -- Check for spurious conflict produced by a subprogram that has the | |
11104 | -- same name as that of the enclosing generic package. The conflict | |
11105 | -- occurs within an instance, between the subprogram and the renaming | |
11106 | -- declaration for the package. After the subprogram, the package | |
11107 | -- renaming declaration becomes hidden. | |
11108 | ||
11109 | if Ekind (E) = E_Package | |
11110 | and then Present (Renamed_Object (E)) | |
11111 | and then Renamed_Object (E) = Current_Scope | |
11112 | and then Nkind (Parent (Renamed_Object (E))) = | |
11113 | N_Package_Specification | |
11114 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
11115 | then | |
11116 | Set_Is_Hidden (E); | |
11117 | Set_Is_Immediately_Visible (E, False); | |
11118 | Enter_Overloaded_Entity (S); | |
11119 | Set_Homonym (S, Homonym (E)); | |
11120 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 11121 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
11122 | |
11123 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
11124 | -- declaration. However if it is dispatching, it must appear in the |
11125 | -- dispatch table anyway, because it can be dispatched to even if it | |
11126 | -- cannot be called directly. | |
996ae0b0 | 11127 | |
4adf3c50 | 11128 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
11129 | Set_Scope (S, Current_Scope); |
11130 | ||
11131 | if Is_Dispatching_Operation (Alias (S)) then | |
11132 | Check_Dispatching_Operation (S, Empty); | |
11133 | end if; | |
11134 | ||
11135 | return; | |
11136 | ||
11137 | else | |
42f11e4c | 11138 | Report_Conflict (S, E); |
996ae0b0 RK |
11139 | return; |
11140 | end if; | |
11141 | ||
fbf5a39b AC |
11142 | -- E exists and is overloadable |
11143 | ||
996ae0b0 | 11144 | else |
8aa15e3b | 11145 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 11146 | |
82c80734 RD |
11147 | -- Loop through E and its homonyms to determine if any of them is |
11148 | -- the candidate for overriding by S. | |
996ae0b0 RK |
11149 | |
11150 | while Present (E) loop | |
fbf5a39b AC |
11151 | |
11152 | -- Definitely not interesting if not in the current scope | |
11153 | ||
996ae0b0 RK |
11154 | if Scope (E) /= Current_Scope then |
11155 | null; | |
11156 | ||
aca90db9 AC |
11157 | -- A function can overload the name of an abstract state. The |
11158 | -- state can be viewed as a function with a profile that cannot | |
11159 | -- be matched by anything. | |
11160 | ||
11161 | elsif Ekind (S) = E_Function | |
11162 | and then Ekind (E) = E_Abstract_State | |
11163 | then | |
11164 | Enter_Overloaded_Entity (S); | |
11165 | return; | |
11166 | ||
2995860f AC |
11167 | -- Ada 2012 (AI05-0165): For internally generated bodies of null |
11168 | -- procedures locate the internally generated spec. We enforce | |
11169 | -- mode conformance since a tagged type may inherit from | |
11170 | -- interfaces several null primitives which differ only in | |
11171 | -- the mode of the formals. | |
25ebc085 AC |
11172 | |
11173 | elsif not Comes_From_Source (S) | |
11174 | and then Is_Null_Procedure (S) | |
11175 | and then not Mode_Conformant (E, S) | |
11176 | then | |
11177 | null; | |
11178 | ||
fbf5a39b AC |
11179 | -- Check if we have type conformance |
11180 | ||
ec4867fa | 11181 | elsif Type_Conformant (E, S) then |
c8ef728f | 11182 | |
82c80734 RD |
11183 | -- If the old and new entities have the same profile and one |
11184 | -- is not the body of the other, then this is an error, unless | |
11185 | -- one of them is implicitly declared. | |
996ae0b0 RK |
11186 | |
11187 | -- There are some cases when both can be implicit, for example | |
11188 | -- when both a literal and a function that overrides it are | |
f3d57416 | 11189 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 11190 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 11191 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 11192 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
11193 | -- the former, and the literal is always the former. In the |
11194 | -- odd case where both are derived operations declared at the | |
11195 | -- same point, both operations should be declared, and in that | |
11196 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
11197 | -- part. This can only occur for certain obscure cases in |
11198 | -- instances, when an operation on a type derived from a formal | |
11199 | -- private type does not override a homograph inherited from | |
11200 | -- the actual. In subsequent derivations of such a type, the | |
11201 | -- DT positions of these operations remain distinct, if they | |
11202 | -- have been set. | |
996ae0b0 RK |
11203 | |
11204 | if Present (Alias (S)) | |
11205 | and then (No (Alias (E)) | |
11206 | or else Comes_From_Source (E) | |
2ddc2000 | 11207 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
11208 | or else |
11209 | (Is_Dispatching_Operation (E) | |
84c0a895 | 11210 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 11211 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 11212 | then |
82c80734 RD |
11213 | -- When an derived operation is overloaded it may be due to |
11214 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
11215 | -- re-inherits. It has to be dealt with. |
11216 | ||
e660dbf7 | 11217 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
11218 | and then In_Private_Part (Current_Scope) |
11219 | then | |
11220 | Check_Operation_From_Private_View (S, E); | |
11221 | end if; | |
11222 | ||
038140ed AC |
11223 | -- In any case the implicit operation remains hidden by the |
11224 | -- existing declaration, which is overriding. Indicate that | |
11225 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 11226 | |
038140ed | 11227 | if Present (Alias (S)) then |
039538bc AC |
11228 | Set_Overridden_Operation (E, Alias (S)); |
11229 | Inherit_Subprogram_Contract (E, Alias (S)); | |
11230 | ||
038140ed | 11231 | else |
039538bc AC |
11232 | Set_Overridden_Operation (E, S); |
11233 | Inherit_Subprogram_Contract (E, S); | |
038140ed | 11234 | end if; |
758c442c GD |
11235 | |
11236 | if Comes_From_Source (E) then | |
5d37ba92 | 11237 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
241ebe89 HK |
11238 | |
11239 | -- The Ghost policy in effect at the point of declaration | |
11240 | -- of a parent subprogram and an overriding subprogram | |
11241 | -- must match (SPARK RM 6.9(17)). | |
11242 | ||
11243 | Check_Ghost_Overriding (E, S); | |
758c442c GD |
11244 | end if; |
11245 | ||
996ae0b0 RK |
11246 | return; |
11247 | ||
26a43556 AC |
11248 | -- Within an instance, the renaming declarations for actual |
11249 | -- subprograms may become ambiguous, but they do not hide each | |
11250 | -- other. | |
996ae0b0 RK |
11251 | |
11252 | elsif Ekind (E) /= E_Entry | |
11253 | and then not Comes_From_Source (E) | |
11254 | and then not Is_Generic_Instance (E) | |
11255 | and then (Present (Alias (E)) | |
11256 | or else Is_Intrinsic_Subprogram (E)) | |
11257 | and then (not In_Instance | |
11258 | or else No (Parent (E)) | |
11259 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 11260 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 11261 | then |
26a43556 AC |
11262 | -- A subprogram child unit is not allowed to override an |
11263 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
11264 | |
11265 | if Is_Child_Unit (S) then | |
11266 | Error_Msg_N | |
11267 | ("child unit overrides inherited subprogram in parent", | |
11268 | S); | |
11269 | return; | |
11270 | end if; | |
11271 | ||
11272 | if Is_Non_Overriding_Operation (E, S) then | |
11273 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 11274 | |
c8ef728f | 11275 | if No (Derived_Type) |
996ae0b0 RK |
11276 | or else Is_Tagged_Type (Derived_Type) |
11277 | then | |
11278 | Check_Dispatching_Operation (S, Empty); | |
11279 | end if; | |
11280 | ||
11281 | return; | |
11282 | end if; | |
11283 | ||
11284 | -- E is a derived operation or an internal operator which | |
11285 | -- is being overridden. Remove E from further visibility. | |
11286 | -- Furthermore, if E is a dispatching operation, it must be | |
11287 | -- replaced in the list of primitive operations of its type | |
11288 | -- (see Override_Dispatching_Operation). | |
11289 | ||
ec4867fa | 11290 | Overridden_Subp := E; |
758c442c | 11291 | |
3f6d1daa JS |
11292 | -- It is possible for E to be in the current scope and |
11293 | -- yet not in the entity chain. This can only occur in a | |
11294 | -- generic context where E is an implicit concatenation | |
11295 | -- in the formal part, because in a generic body the | |
11296 | -- entity chain starts with the formals. | |
996ae0b0 | 11297 | |
3f6d1daa JS |
11298 | -- In GNATprove mode, a wrapper for an operation with |
11299 | -- axiomatization may be a homonym of another declaration | |
11300 | -- for an actual subprogram (needs refinement ???). | |
948ed277 | 11301 | |
3f6d1daa JS |
11302 | if No (Prev_Entity (E)) then |
11303 | if In_Instance | |
11304 | and then GNATprove_Mode | |
11305 | and then | |
11306 | Nkind (Original_Node (Unit_Declaration_Node (S))) = | |
11307 | N_Subprogram_Renaming_Declaration | |
11308 | then | |
11309 | return; | |
11310 | else | |
11311 | pragma Assert (Chars (E) = Name_Op_Concat); | |
11312 | null; | |
948ed277 | 11313 | end if; |
3f6d1daa | 11314 | end if; |
996ae0b0 | 11315 | |
3f6d1daa JS |
11316 | -- E must be removed both from the entity_list of the |
11317 | -- current scope, and from the visibility chain. | |
996ae0b0 | 11318 | |
3f6d1daa JS |
11319 | if Debug_Flag_E then |
11320 | Write_Str ("Override implicit operation "); | |
11321 | Write_Int (Int (E)); | |
11322 | Write_Eol; | |
11323 | end if; | |
996ae0b0 | 11324 | |
3f6d1daa JS |
11325 | -- If E is a predefined concatenation, it stands for four |
11326 | -- different operations. As a result, a single explicit | |
11327 | -- declaration does not hide it. In a possible ambiguous | |
11328 | -- situation, Disambiguate chooses the user-defined op, | |
11329 | -- so it is correct to retain the previous internal one. | |
996ae0b0 | 11330 | |
3f6d1daa JS |
11331 | if Chars (E) /= Name_Op_Concat |
11332 | or else Ekind (E) /= E_Operator | |
11333 | then | |
11334 | -- For nondispatching derived operations that are | |
11335 | -- overridden by a subprogram declared in the private | |
11336 | -- part of a package, we retain the derived subprogram | |
11337 | -- but mark it as not immediately visible. If the | |
11338 | -- derived operation was declared in the visible part | |
11339 | -- then this ensures that it will still be visible | |
11340 | -- outside the package with the proper signature | |
11341 | -- (calls from outside must also be directed to this | |
11342 | -- version rather than the overriding one, unlike the | |
11343 | -- dispatching case). Calls from inside the package | |
11344 | -- will still resolve to the overriding subprogram | |
11345 | -- since the derived one is marked as not visible | |
11346 | -- within the package. | |
11347 | ||
11348 | -- If the private operation is dispatching, we achieve | |
11349 | -- the overriding by keeping the implicit operation | |
11350 | -- but setting its alias to be the overriding one. In | |
11351 | -- this fashion the proper body is executed in all | |
11352 | -- cases, but the original signature is used outside | |
11353 | -- of the package. | |
11354 | ||
11355 | -- If the overriding is not in the private part, we | |
11356 | -- remove the implicit operation altogether. | |
11357 | ||
11358 | if Is_Private_Declaration (S) then | |
11359 | if not Is_Dispatching_Operation (E) then | |
11360 | Set_Is_Immediately_Visible (E, False); | |
fbf5a39b | 11361 | else |
3f6d1daa JS |
11362 | -- Work done in Override_Dispatching_Operation, so |
11363 | -- nothing else needs to be done here. | |
996ae0b0 | 11364 | |
3f6d1daa | 11365 | null; |
996ae0b0 | 11366 | end if; |
3f6d1daa JS |
11367 | |
11368 | else | |
11369 | Remove_Entity_And_Homonym (E); | |
996ae0b0 | 11370 | end if; |
3f6d1daa | 11371 | end if; |
996ae0b0 | 11372 | |
3f6d1daa | 11373 | Enter_Overloaded_Entity (S); |
1c1289e7 | 11374 | |
3f6d1daa JS |
11375 | -- For entities generated by Derive_Subprograms the |
11376 | -- overridden operation is the inherited primitive | |
11377 | -- (which is available through the attribute alias). | |
1c1289e7 | 11378 | |
3f6d1daa JS |
11379 | if not (Comes_From_Source (E)) |
11380 | and then Is_Dispatching_Operation (E) | |
11381 | and then Find_Dispatching_Type (E) = | |
11382 | Find_Dispatching_Type (S) | |
11383 | and then Present (Alias (E)) | |
11384 | and then Comes_From_Source (Alias (E)) | |
11385 | then | |
11386 | Set_Overridden_Operation (S, Alias (E)); | |
11387 | Inherit_Subprogram_Contract (S, Alias (E)); | |
2fe829ae | 11388 | |
3f6d1daa | 11389 | -- Normal case of setting entity as overridden |
6320f5e1 | 11390 | |
3f6d1daa JS |
11391 | -- Note: Static_Initialization and Overridden_Operation |
11392 | -- attributes use the same field in subprogram entities. | |
11393 | -- Static_Initialization is only defined for internal | |
11394 | -- initialization procedures, where Overridden_Operation | |
11395 | -- is irrelevant. Therefore the setting of this attribute | |
11396 | -- must check whether the target is an init_proc. | |
6320f5e1 | 11397 | |
3f6d1daa JS |
11398 | elsif not Is_Init_Proc (S) then |
11399 | Set_Overridden_Operation (S, E); | |
11400 | Inherit_Subprogram_Contract (S, E); | |
11401 | end if; | |
1c1289e7 | 11402 | |
3f6d1daa | 11403 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 11404 | |
3f6d1daa JS |
11405 | -- The Ghost policy in effect at the point of declaration |
11406 | -- of a parent subprogram and an overriding subprogram | |
11407 | -- must match (SPARK RM 6.9(17)). | |
241ebe89 | 11408 | |
3f6d1daa | 11409 | Check_Ghost_Overriding (S, E); |
241ebe89 | 11410 | |
3f6d1daa JS |
11411 | -- If S is a user-defined subprogram or a null procedure |
11412 | -- expanded to override an inherited null procedure, or a | |
11413 | -- predefined dispatching primitive then indicate that E | |
11414 | -- overrides the operation from which S is inherited. | |
fc53fe76 | 11415 | |
3f6d1daa JS |
11416 | if Comes_From_Source (S) |
11417 | or else | |
11418 | (Present (Parent (S)) | |
11419 | and then Nkind (Parent (S)) = N_Procedure_Specification | |
11420 | and then Null_Present (Parent (S))) | |
11421 | or else | |
11422 | (Present (Alias (E)) | |
11423 | and then | |
11424 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
11425 | then | |
11426 | if Present (Alias (E)) then | |
11427 | Set_Overridden_Operation (S, Alias (E)); | |
11428 | Inherit_Subprogram_Contract (S, Alias (E)); | |
41251c60 | 11429 | end if; |
3f6d1daa | 11430 | end if; |
41251c60 | 11431 | |
3f6d1daa | 11432 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 11433 | |
3f6d1daa JS |
11434 | -- An overriding dispatching subprogram inherits the |
11435 | -- convention of the overridden subprogram (AI-117). | |
996ae0b0 | 11436 | |
3f6d1daa JS |
11437 | Set_Convention (S, Convention (E)); |
11438 | Check_Dispatching_Operation (S, E); | |
41251c60 | 11439 | |
3f6d1daa JS |
11440 | else |
11441 | Check_Dispatching_Operation (S, Empty); | |
11442 | end if; | |
996ae0b0 | 11443 | |
3f6d1daa JS |
11444 | Check_For_Primitive_Subprogram |
11445 | (Is_Primitive_Subp, Is_Overriding => True); | |
11446 | goto Check_Inequality; | |
996ae0b0 RK |
11447 | |
11448 | -- Apparent redeclarations in instances can occur when two | |
11449 | -- formal types get the same actual type. The subprograms in | |
11450 | -- in the instance are legal, even if not callable from the | |
11451 | -- outside. Calls from within are disambiguated elsewhere. | |
11452 | -- For dispatching operations in the visible part, the usual | |
11453 | -- rules apply, and operations with the same profile are not | |
11454 | -- legal (B830001). | |
11455 | ||
11456 | elsif (In_Instance_Visible_Part | |
11457 | and then not Is_Dispatching_Operation (E)) | |
11458 | or else In_Instance_Not_Visible | |
11459 | then | |
11460 | null; | |
11461 | ||
11462 | -- Here we have a real error (identical profile) | |
11463 | ||
11464 | else | |
11465 | Error_Msg_Sloc := Sloc (E); | |
11466 | ||
11467 | -- Avoid cascaded errors if the entity appears in | |
11468 | -- subsequent calls. | |
11469 | ||
11470 | Set_Scope (S, Current_Scope); | |
11471 | ||
5d37ba92 ES |
11472 | -- Generate error, with extra useful warning for the case |
11473 | -- of a generic instance with no completion. | |
996ae0b0 RK |
11474 | |
11475 | if Is_Generic_Instance (S) | |
11476 | and then not Has_Completion (E) | |
11477 | then | |
11478 | Error_Msg_N | |
5d37ba92 ES |
11479 | ("instantiation cannot provide body for&", S); |
11480 | Error_Msg_N ("\& conflicts with declaration#", S); | |
11481 | else | |
11482 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
11483 | end if; |
11484 | ||
11485 | return; | |
11486 | end if; | |
11487 | ||
11488 | else | |
c8ef728f ES |
11489 | -- If one subprogram has an access parameter and the other |
11490 | -- a parameter of an access type, calls to either might be | |
11491 | -- ambiguous. Verify that parameters match except for the | |
11492 | -- access parameter. | |
11493 | ||
11494 | if May_Hide_Profile then | |
11495 | declare | |
ec4867fa ES |
11496 | F1 : Entity_Id; |
11497 | F2 : Entity_Id; | |
8dbd1460 | 11498 | |
c8ef728f ES |
11499 | begin |
11500 | F1 := First_Formal (S); | |
11501 | F2 := First_Formal (E); | |
11502 | while Present (F1) and then Present (F2) loop | |
11503 | if Is_Access_Type (Etype (F1)) then | |
11504 | if not Is_Access_Type (Etype (F2)) | |
11505 | or else not Conforming_Types | |
11506 | (Designated_Type (Etype (F1)), | |
11507 | Designated_Type (Etype (F2)), | |
11508 | Type_Conformant) | |
11509 | then | |
11510 | May_Hide_Profile := False; | |
11511 | end if; | |
11512 | ||
11513 | elsif | |
11514 | not Conforming_Types | |
11515 | (Etype (F1), Etype (F2), Type_Conformant) | |
11516 | then | |
11517 | May_Hide_Profile := False; | |
11518 | end if; | |
11519 | ||
11520 | Next_Formal (F1); | |
11521 | Next_Formal (F2); | |
11522 | end loop; | |
11523 | ||
11524 | if May_Hide_Profile | |
11525 | and then No (F1) | |
11526 | and then No (F2) | |
11527 | then | |
dbfeb4fa | 11528 | Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
c8ef728f ES |
11529 | end if; |
11530 | end; | |
11531 | end if; | |
996ae0b0 RK |
11532 | end if; |
11533 | ||
996ae0b0 RK |
11534 | E := Homonym (E); |
11535 | end loop; | |
11536 | ||
11537 | -- On exit, we know that S is a new entity | |
11538 | ||
11539 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
11540 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
11541 | Check_Overriding_Indicator | |
11542 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 11543 | |
241ebe89 HK |
11544 | -- The Ghost policy in effect at the point of declaration of a parent |
11545 | -- subprogram and an overriding subprogram must match | |
11546 | -- (SPARK RM 6.9(17)). | |
11547 | ||
11548 | Check_Ghost_Overriding (S, Overridden_Subp); | |
11549 | ||
c4d67e2d | 11550 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 11551 | |
c4d67e2d AC |
11552 | if Nkind (S) /= N_Defining_Operator_Symbol then |
11553 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
ce5ba43a | 11554 | Check_SPARK_05_Restriction |
c4d67e2d AC |
11555 | ("overloading not allowed with entity#", S); |
11556 | end if; | |
8ed68165 | 11557 | |
82c80734 RD |
11558 | -- If S is a derived operation for an untagged type then by |
11559 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
11560 | -- operation was dispatching), so Check_Dispatching_Operation is not |
11561 | -- called in that case. | |
996ae0b0 | 11562 | |
c8ef728f | 11563 | if No (Derived_Type) |
996ae0b0 RK |
11564 | or else Is_Tagged_Type (Derived_Type) |
11565 | then | |
11566 | Check_Dispatching_Operation (S, Empty); | |
11567 | end if; | |
11568 | end if; | |
11569 | ||
82c80734 RD |
11570 | -- If this is a user-defined equality operator that is not a derived |
11571 | -- subprogram, create the corresponding inequality. If the operation is | |
11572 | -- dispatching, the expansion is done elsewhere, and we do not create | |
11573 | -- an explicit inequality operation. | |
996ae0b0 RK |
11574 | |
11575 | <<Check_Inequality>> | |
11576 | if Chars (S) = Name_Op_Eq | |
11577 | and then Etype (S) = Standard_Boolean | |
11578 | and then Present (Parent (S)) | |
11579 | and then not Is_Dispatching_Operation (S) | |
11580 | then | |
11581 | Make_Inequality_Operator (S); | |
b2834fbd | 11582 | Check_Untagged_Equality (S); |
996ae0b0 | 11583 | end if; |
996ae0b0 RK |
11584 | end New_Overloaded_Entity; |
11585 | ||
e4d29736 JM |
11586 | ---------------------------------- |
11587 | -- Preanalyze_Formal_Expression -- | |
11588 | ---------------------------------- | |
11589 | ||
11590 | procedure Preanalyze_Formal_Expression (N : Node_Id; T : Entity_Id) is | |
11591 | Save_In_Spec_Expression : constant Boolean := In_Spec_Expression; | |
11592 | begin | |
11593 | In_Spec_Expression := True; | |
11594 | Preanalyze_With_Freezing_And_Resolve (N, T); | |
11595 | In_Spec_Expression := Save_In_Spec_Expression; | |
11596 | end Preanalyze_Formal_Expression; | |
11597 | ||
996ae0b0 RK |
11598 | --------------------- |
11599 | -- Process_Formals -- | |
11600 | --------------------- | |
11601 | ||
11602 | procedure Process_Formals | |
07fc65c4 | 11603 | (T : List_Id; |
996ae0b0 RK |
11604 | Related_Nod : Node_Id) |
11605 | is | |
7b56a91b | 11606 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
950d217a AC |
11607 | -- Determine whether an access type designates a type coming from a |
11608 | -- limited view. | |
11609 | ||
07fc65c4 | 11610 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
11611 | -- Check whether the default has a class-wide type. After analysis the |
11612 | -- default has the type of the formal, so we must also check explicitly | |
11613 | -- for an access attribute. | |
07fc65c4 | 11614 | |
7b56a91b AC |
11615 | ---------------------------------- |
11616 | -- Designates_From_Limited_With -- | |
11617 | ---------------------------------- | |
950d217a | 11618 | |
7b56a91b | 11619 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
950d217a AC |
11620 | Desig : Entity_Id := Typ; |
11621 | ||
11622 | begin | |
11623 | if Is_Access_Type (Desig) then | |
11624 | Desig := Directly_Designated_Type (Desig); | |
11625 | end if; | |
11626 | ||
11627 | if Is_Class_Wide_Type (Desig) then | |
11628 | Desig := Root_Type (Desig); | |
11629 | end if; | |
11630 | ||
11631 | return | |
7b56a91b AC |
11632 | Ekind (Desig) = E_Incomplete_Type |
11633 | and then From_Limited_With (Desig); | |
11634 | end Designates_From_Limited_With; | |
950d217a | 11635 | |
07fc65c4 GB |
11636 | --------------------------- |
11637 | -- Is_Class_Wide_Default -- | |
11638 | --------------------------- | |
11639 | ||
11640 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
11641 | begin | |
11642 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
1b1d88b1 | 11643 | or else (Nkind (D) = N_Attribute_Reference |
0f853035 YM |
11644 | and then Attribute_Name (D) = Name_Access |
11645 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
11646 | end Is_Class_Wide_Default; |
11647 | ||
847d950d HK |
11648 | -- Local variables |
11649 | ||
11650 | Context : constant Node_Id := Parent (Parent (T)); | |
11651 | Default : Node_Id; | |
11652 | Formal : Entity_Id; | |
11653 | Formal_Type : Entity_Id; | |
11654 | Param_Spec : Node_Id; | |
11655 | Ptype : Entity_Id; | |
11656 | ||
11657 | Num_Out_Params : Nat := 0; | |
11658 | First_Out_Param : Entity_Id := Empty; | |
11659 | -- Used for setting Is_Only_Out_Parameter | |
11660 | ||
07fc65c4 GB |
11661 | -- Start of processing for Process_Formals |
11662 | ||
996ae0b0 RK |
11663 | begin |
11664 | -- In order to prevent premature use of the formals in the same formal | |
11665 | -- part, the Ekind is left undefined until all default expressions are | |
11666 | -- analyzed. The Ekind is established in a separate loop at the end. | |
11667 | ||
11668 | Param_Spec := First (T); | |
996ae0b0 | 11669 | while Present (Param_Spec) loop |
996ae0b0 | 11670 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 11671 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
11672 | Enter_Name (Formal); |
11673 | ||
11674 | -- Case of ordinary parameters | |
11675 | ||
11676 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
11677 | Find_Type (Parameter_Type (Param_Spec)); | |
11678 | Ptype := Parameter_Type (Param_Spec); | |
11679 | ||
11680 | if Ptype = Error then | |
11681 | goto Continue; | |
11682 | end if; | |
11683 | ||
7f8c1cd3 | 11684 | -- Protect against malformed parameter types |
a9e47028 ES |
11685 | |
11686 | if Nkind (Ptype) not in N_Has_Entity then | |
11687 | Formal_Type := Any_Type; | |
11688 | else | |
11689 | Formal_Type := Entity (Ptype); | |
11690 | end if; | |
996ae0b0 | 11691 | |
ec4867fa ES |
11692 | if Is_Incomplete_Type (Formal_Type) |
11693 | or else | |
11694 | (Is_Class_Wide_Type (Formal_Type) | |
8fde064e | 11695 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
996ae0b0 | 11696 | then |
93bcda23 AC |
11697 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
11698 | -- primitive operations, as long as their completion is | |
11699 | -- in the same declarative part. If in the private part | |
11700 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
11701 | -- Check is done on package exit. For access to subprograms, |
11702 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 11703 | |
6eddd7b4 AC |
11704 | -- Ada 2012: tagged incomplete types are allowed as generic |
11705 | -- formal types. They do not introduce dependencies and the | |
11706 | -- corresponding generic subprogram does not have a delayed | |
5b6f12c7 AC |
11707 | -- freeze, because it does not need a freeze node. However, |
11708 | -- it is still the case that untagged incomplete types cannot | |
11709 | -- be Taft-amendment types and must be completed in private | |
11710 | -- part, so the subprogram must appear in the list of private | |
1e55d29a | 11711 | -- dependents of the type. |
5b6f12c7 AC |
11712 | |
11713 | if Is_Tagged_Type (Formal_Type) | |
b973629e | 11714 | or else (Ada_Version >= Ada_2012 |
1ebc2612 AC |
11715 | and then not From_Limited_With (Formal_Type) |
11716 | and then not Is_Generic_Type (Formal_Type)) | |
5b6f12c7 | 11717 | then |
93bcda23 | 11718 | if Ekind (Scope (Current_Scope)) = E_Package |
6eddd7b4 | 11719 | and then not Is_Generic_Type (Formal_Type) |
1e55d29a | 11720 | and then not Is_Class_Wide_Type (Formal_Type) |
93bcda23 | 11721 | then |
cec29135 | 11722 | if not Nkind_In |
f26a3587 AC |
11723 | (Parent (T), N_Access_Function_Definition, |
11724 | N_Access_Procedure_Definition) | |
cec29135 | 11725 | then |
1e55d29a EB |
11726 | Append_Elmt (Current_Scope, |
11727 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
11728 | |
11729 | -- Freezing is delayed to ensure that Register_Prim | |
11730 | -- will get called for this operation, which is needed | |
11731 | -- in cases where static dispatch tables aren't built. | |
11732 | -- (Note that the same is done for controlling access | |
11733 | -- parameter cases in function Access_Definition.) | |
11734 | ||
13fa2acb AC |
11735 | if not Is_Thunk (Current_Scope) then |
11736 | Set_Has_Delayed_Freeze (Current_Scope); | |
11737 | end if; | |
cec29135 | 11738 | end if; |
93bcda23 | 11739 | end if; |
fbf5a39b | 11740 | |
800621e0 RD |
11741 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
11742 | N_Access_Procedure_Definition) | |
996ae0b0 | 11743 | then |
dd386db0 AC |
11744 | -- AI05-0151: Tagged incomplete types are allowed in all |
11745 | -- formal parts. Untagged incomplete types are not allowed | |
b973629e AC |
11746 | -- in bodies. Limited views of either kind are not allowed |
11747 | -- if there is no place at which the non-limited view can | |
11748 | -- become available. | |
a18e3d62 | 11749 | |
1ebc2612 AC |
11750 | -- Incomplete formal untagged types are not allowed in |
11751 | -- subprogram bodies (but are legal in their declarations). | |
c8d3b4ff AC |
11752 | -- This excludes bodies created for null procedures, which |
11753 | -- are basic declarations. | |
1ebc2612 AC |
11754 | |
11755 | if Is_Generic_Type (Formal_Type) | |
11756 | and then not Is_Tagged_Type (Formal_Type) | |
11757 | and then Nkind (Parent (Related_Nod)) = N_Subprogram_Body | |
11758 | then | |
11759 | Error_Msg_N | |
11760 | ("invalid use of formal incomplete type", Param_Spec); | |
dd386db0 | 11761 | |
1ebc2612 | 11762 | elsif Ada_Version >= Ada_2012 then |
b973629e AC |
11763 | if Is_Tagged_Type (Formal_Type) |
11764 | and then (not From_Limited_With (Formal_Type) | |
11765 | or else not In_Package_Body) | |
11766 | then | |
dd386db0 AC |
11767 | null; |
11768 | ||
c8d3b4ff AC |
11769 | elsif Nkind_In (Context, N_Accept_Statement, |
11770 | N_Accept_Alternative, | |
11771 | N_Entry_Body) | |
11772 | or else (Nkind (Context) = N_Subprogram_Body | |
11773 | and then Comes_From_Source (Context)) | |
dd386db0 AC |
11774 | then |
11775 | Error_Msg_NE | |
c8d3b4ff | 11776 | ("invalid use of untagged incomplete type &", |
0f1a6a0b | 11777 | Ptype, Formal_Type); |
dd386db0 AC |
11778 | end if; |
11779 | ||
11780 | else | |
11781 | Error_Msg_NE | |
11782 | ("invalid use of incomplete type&", | |
0f1a6a0b | 11783 | Param_Spec, Formal_Type); |
dd386db0 AC |
11784 | |
11785 | -- Further checks on the legality of incomplete types | |
11786 | -- in formal parts are delayed until the freeze point | |
11787 | -- of the enclosing subprogram or access to subprogram. | |
11788 | end if; | |
996ae0b0 RK |
11789 | end if; |
11790 | ||
11791 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
11792 | Error_Msg_NE |
11793 | ("premature use of&", | |
11794 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
11795 | end if; |
11796 | ||
fecbd779 AC |
11797 | -- Ada 2012 (AI-142): Handle aliased parameters |
11798 | ||
11799 | if Ada_Version >= Ada_2012 | |
11800 | and then Aliased_Present (Param_Spec) | |
11801 | then | |
11802 | Set_Is_Aliased (Formal); | |
a517d6c1 EB |
11803 | |
11804 | -- AI12-001: All aliased objects are considered to be specified | |
11805 | -- as independently addressable (RM C.6(8.1/4)). | |
11806 | ||
11807 | Set_Is_Independent (Formal); | |
fecbd779 AC |
11808 | end if; |
11809 | ||
0ab80019 | 11810 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 11811 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
11812 | -- formal in the enclosing scope. Finally, replace the parameter |
11813 | -- type of the formal with the internal subtype. | |
7324bf49 | 11814 | |
0791fbe9 | 11815 | if Ada_Version >= Ada_2005 |
41251c60 | 11816 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 11817 | then |
ec4867fa | 11818 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 11819 | Error_Msg_N |
0a36105d JM |
11820 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
11821 | ||
ec4867fa ES |
11822 | else |
11823 | if Can_Never_Be_Null (Formal_Type) | |
11824 | and then Comes_From_Source (Related_Nod) | |
11825 | then | |
ed2233dc | 11826 | Error_Msg_NE |
0a36105d | 11827 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 11828 | Param_Spec, Formal_Type); |
ec4867fa | 11829 | end if; |
41251c60 | 11830 | |
ec4867fa ES |
11831 | Formal_Type := |
11832 | Create_Null_Excluding_Itype | |
11833 | (T => Formal_Type, | |
11834 | Related_Nod => Related_Nod, | |
11835 | Scope_Id => Scope (Current_Scope)); | |
0a36105d | 11836 | |
fcf848c4 AC |
11837 | -- If the designated type of the itype is an itype that is |
11838 | -- not frozen yet, we set the Has_Delayed_Freeze attribute | |
11839 | -- on the access subtype, to prevent order-of-elaboration | |
11840 | -- issues in the backend. | |
0a36105d JM |
11841 | |
11842 | -- Example: | |
11843 | -- type T is access procedure; | |
11844 | -- procedure Op (O : not null T); | |
11845 | ||
fcf848c4 AC |
11846 | if Is_Itype (Directly_Designated_Type (Formal_Type)) |
11847 | and then | |
11848 | not Is_Frozen (Directly_Designated_Type (Formal_Type)) | |
11849 | then | |
0a36105d JM |
11850 | Set_Has_Delayed_Freeze (Formal_Type); |
11851 | end if; | |
ec4867fa | 11852 | end if; |
7324bf49 AC |
11853 | end if; |
11854 | ||
996ae0b0 RK |
11855 | -- An access formal type |
11856 | ||
11857 | else | |
11858 | Formal_Type := | |
11859 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 11860 | |
f937473f RD |
11861 | -- No need to continue if we already notified errors |
11862 | ||
11863 | if not Present (Formal_Type) then | |
11864 | return; | |
11865 | end if; | |
11866 | ||
0ab80019 | 11867 | -- Ada 2005 (AI-254) |
7324bf49 | 11868 | |
af4b9434 AC |
11869 | declare |
11870 | AD : constant Node_Id := | |
11871 | Access_To_Subprogram_Definition | |
11872 | (Parameter_Type (Param_Spec)); | |
11873 | begin | |
11874 | if Present (AD) and then Protected_Present (AD) then | |
11875 | Formal_Type := | |
11876 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 11877 | (Param_Spec); |
af4b9434 AC |
11878 | end if; |
11879 | end; | |
996ae0b0 RK |
11880 | end if; |
11881 | ||
11882 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 11883 | |
fecbd779 AC |
11884 | -- Deal with default expression if present |
11885 | ||
fbf5a39b | 11886 | Default := Expression (Param_Spec); |
996ae0b0 RK |
11887 | |
11888 | if Present (Default) then | |
ce5ba43a | 11889 | Check_SPARK_05_Restriction |
fe5d3068 | 11890 | ("default expression is not allowed", Default); |
38171f43 | 11891 | |
996ae0b0 | 11892 | if Out_Present (Param_Spec) then |
ed2233dc | 11893 | Error_Msg_N |
996ae0b0 RK |
11894 | ("default initialization only allowed for IN parameters", |
11895 | Param_Spec); | |
11896 | end if; | |
11897 | ||
11898 | -- Do the special preanalysis of the expression (see section on | |
11899 | -- "Handling of Default Expressions" in the spec of package Sem). | |
11900 | ||
e4d29736 | 11901 | Preanalyze_Formal_Expression (Default, Formal_Type); |
996ae0b0 | 11902 | |
f29b857f ES |
11903 | -- An access to constant cannot be the default for |
11904 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
11905 | |
11906 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
11907 | and then not Is_Access_Constant (Formal_Type) | |
11908 | and then Is_Access_Type (Etype (Default)) | |
11909 | and then Is_Access_Constant (Etype (Default)) | |
11910 | then | |
f29b857f | 11911 | Error_Msg_N |
84c0a895 AC |
11912 | ("formal that is access to variable cannot be initialized " |
11913 | & "with an access-to-constant expression", Default); | |
2eb160f2 ST |
11914 | end if; |
11915 | ||
d8db0bca JM |
11916 | -- Check that the designated type of an access parameter's default |
11917 | -- is not a class-wide type unless the parameter's designated type | |
11918 | -- is also class-wide. | |
996ae0b0 RK |
11919 | |
11920 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
7b56a91b | 11921 | and then not Designates_From_Limited_With (Formal_Type) |
07fc65c4 | 11922 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
11923 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
11924 | then | |
07fc65c4 GB |
11925 | Error_Msg_N |
11926 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 11927 | end if; |
4755cce9 JM |
11928 | |
11929 | -- Check incorrect use of dynamically tagged expressions | |
11930 | ||
11931 | if Is_Tagged_Type (Formal_Type) then | |
11932 | Check_Dynamically_Tagged_Expression | |
11933 | (Expr => Default, | |
11934 | Typ => Formal_Type, | |
11935 | Related_Nod => Default); | |
11936 | end if; | |
996ae0b0 RK |
11937 | end if; |
11938 | ||
41251c60 JM |
11939 | -- Ada 2005 (AI-231): Static checks |
11940 | ||
0791fbe9 | 11941 | if Ada_Version >= Ada_2005 |
41251c60 JM |
11942 | and then Is_Access_Type (Etype (Formal)) |
11943 | and then Can_Never_Be_Null (Etype (Formal)) | |
11944 | then | |
11945 | Null_Exclusion_Static_Checks (Param_Spec); | |
11946 | end if; | |
11947 | ||
847d950d HK |
11948 | -- The following checks are relevant only when SPARK_Mode is on as |
11949 | -- these are not standard Ada legality rules. | |
6c3c671e | 11950 | |
ea26c8e4 HK |
11951 | if SPARK_Mode = On then |
11952 | if Ekind_In (Scope (Formal), E_Function, E_Generic_Function) then | |
f1bd0415 | 11953 | |
ea26c8e4 HK |
11954 | -- A function cannot have a parameter of mode IN OUT or OUT |
11955 | -- (SPARK RM 6.1). | |
f1bd0415 | 11956 | |
ea26c8e4 HK |
11957 | if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then |
11958 | Error_Msg_N | |
11959 | ("function cannot have parameter of mode `OUT` or " | |
11960 | & "`IN OUT`", Formal); | |
ea26c8e4 HK |
11961 | end if; |
11962 | ||
d780e54f AC |
11963 | -- A procedure cannot have an effectively volatile formal |
11964 | -- parameter of mode IN because it behaves as a constant | |
db7e3721 | 11965 | -- (SPARK RM 7.1.3(6)). -- ??? maybe 7.1.3(4) |
ea26c8e4 HK |
11966 | |
11967 | elsif Ekind (Scope (Formal)) = E_Procedure | |
11968 | and then Ekind (Formal) = E_In_Parameter | |
d780e54f | 11969 | and then Is_Effectively_Volatile (Formal) |
ea26c8e4 | 11970 | then |
f1bd0415 | 11971 | Error_Msg_N |
ea26c8e4 | 11972 | ("formal parameter of mode `IN` cannot be volatile", Formal); |
f1bd0415 | 11973 | end if; |
6c3c671e AC |
11974 | end if; |
11975 | ||
996ae0b0 RK |
11976 | <<Continue>> |
11977 | Next (Param_Spec); | |
11978 | end loop; | |
11979 | ||
82c80734 RD |
11980 | -- If this is the formal part of a function specification, analyze the |
11981 | -- subtype mark in the context where the formals are visible but not | |
11982 | -- yet usable, and may hide outer homographs. | |
11983 | ||
11984 | if Nkind (Related_Nod) = N_Function_Specification then | |
11985 | Analyze_Return_Type (Related_Nod); | |
11986 | end if; | |
11987 | ||
996ae0b0 RK |
11988 | -- Now set the kind (mode) of each formal |
11989 | ||
11990 | Param_Spec := First (T); | |
996ae0b0 RK |
11991 | while Present (Param_Spec) loop |
11992 | Formal := Defining_Identifier (Param_Spec); | |
11993 | Set_Formal_Mode (Formal); | |
11994 | ||
11995 | if Ekind (Formal) = E_In_Parameter then | |
11996 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
11997 | ||
11998 | if Present (Expression (Param_Spec)) then | |
c8307596 | 11999 | Default := Expression (Param_Spec); |
996ae0b0 RK |
12000 | |
12001 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
12002 | if Nkind (Parameter_Type (Param_Spec)) /= |
12003 | N_Access_Definition | |
996ae0b0 RK |
12004 | then |
12005 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 12006 | else |
5ebfaacf AC |
12007 | Formal_Type := |
12008 | Access_Definition | |
12009 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
12010 | end if; |
12011 | ||
12012 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
12013 | end if; | |
2820d220 | 12014 | end if; |
800621e0 RD |
12015 | |
12016 | elsif Ekind (Formal) = E_Out_Parameter then | |
12017 | Num_Out_Params := Num_Out_Params + 1; | |
12018 | ||
12019 | if Num_Out_Params = 1 then | |
12020 | First_Out_Param := Formal; | |
12021 | end if; | |
12022 | ||
12023 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
12024 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
12025 | end if; |
12026 | ||
4172a8e3 AC |
12027 | -- Skip remaining processing if formal type was in error |
12028 | ||
12029 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
12030 | goto Next_Parameter; | |
12031 | end if; | |
12032 | ||
fecbd779 AC |
12033 | -- Force call by reference if aliased |
12034 | ||
1e60643a AC |
12035 | declare |
12036 | Conv : constant Convention_Id := Convention (Etype (Formal)); | |
12037 | begin | |
12038 | if Is_Aliased (Formal) then | |
12039 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf | 12040 | |
1e60643a | 12041 | -- Warn if user asked this to be passed by copy |
5ebfaacf | 12042 | |
1e60643a AC |
12043 | if Conv = Convention_Ada_Pass_By_Copy then |
12044 | Error_Msg_N | |
12045 | ("cannot pass aliased parameter & by copy??", Formal); | |
12046 | end if; | |
5ebfaacf | 12047 | |
1e60643a | 12048 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy |
5ebfaacf | 12049 | |
1e60643a AC |
12050 | elsif Conv = Convention_Ada_Pass_By_Copy then |
12051 | Set_Mechanism (Formal, By_Copy); | |
5ebfaacf | 12052 | |
1e60643a AC |
12053 | elsif Conv = Convention_Ada_Pass_By_Reference then |
12054 | Set_Mechanism (Formal, By_Reference); | |
12055 | end if; | |
12056 | end; | |
fecbd779 | 12057 | |
4172a8e3 | 12058 | <<Next_Parameter>> |
996ae0b0 RK |
12059 | Next (Param_Spec); |
12060 | end loop; | |
800621e0 RD |
12061 | |
12062 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
12063 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
12064 | end if; | |
996ae0b0 RK |
12065 | end Process_Formals; |
12066 | ||
fbf5a39b AC |
12067 | ---------------------------- |
12068 | -- Reference_Body_Formals -- | |
12069 | ---------------------------- | |
12070 | ||
12071 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
12072 | Fs : Entity_Id; | |
12073 | Fb : Entity_Id; | |
12074 | ||
12075 | begin | |
12076 | if Error_Posted (Spec) then | |
12077 | return; | |
12078 | end if; | |
12079 | ||
0a36105d JM |
12080 | -- Iterate over both lists. They may be of different lengths if the two |
12081 | -- specs are not conformant. | |
12082 | ||
fbf5a39b AC |
12083 | Fs := First_Formal (Spec); |
12084 | Fb := First_Formal (Bod); | |
0a36105d | 12085 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
12086 | Generate_Reference (Fs, Fb, 'b'); |
12087 | ||
12088 | if Style_Check then | |
12089 | Style.Check_Identifier (Fb, Fs); | |
12090 | end if; | |
12091 | ||
12092 | Set_Spec_Entity (Fb, Fs); | |
12093 | Set_Referenced (Fs, False); | |
12094 | Next_Formal (Fs); | |
12095 | Next_Formal (Fb); | |
12096 | end loop; | |
12097 | end Reference_Body_Formals; | |
12098 | ||
996ae0b0 RK |
12099 | ------------------------- |
12100 | -- Set_Actual_Subtypes -- | |
12101 | ------------------------- | |
12102 | ||
12103 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
84c0a895 AC |
12104 | Decl : Node_Id; |
12105 | Formal : Entity_Id; | |
12106 | T : Entity_Id; | |
12107 | First_Stmt : Node_Id := Empty; | |
12108 | AS_Needed : Boolean; | |
996ae0b0 RK |
12109 | |
12110 | begin | |
f3d57416 | 12111 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
12112 | -- actual subtypes (small optimization). |
12113 | ||
8fde064e | 12114 | if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
fbf5a39b | 12115 | return; |
0691ed6b AC |
12116 | |
12117 | -- Within a predicate function we do not want to generate local | |
12118 | -- subtypes that may generate nested predicate functions. | |
12119 | ||
12120 | elsif Is_Subprogram (Subp) and then Is_Predicate_Function (Subp) then | |
12121 | return; | |
fbf5a39b AC |
12122 | end if; |
12123 | ||
124bed29 AC |
12124 | -- The subtype declarations may freeze the formals. The body generated |
12125 | -- for an expression function is not a freeze point, so do not emit | |
12126 | -- these declarations (small loss of efficiency in rare cases). | |
12127 | ||
12128 | if Nkind (N) = N_Subprogram_Body | |
12129 | and then Was_Expression_Function (N) | |
12130 | then | |
12131 | return; | |
12132 | end if; | |
12133 | ||
996ae0b0 RK |
12134 | Formal := First_Formal (Subp); |
12135 | while Present (Formal) loop | |
12136 | T := Etype (Formal); | |
12137 | ||
e895b435 | 12138 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
12139 | |
12140 | if Is_Constrained (T) then | |
12141 | AS_Needed := False; | |
12142 | ||
82c80734 | 12143 | -- If we have unknown discriminants, then we do not need an actual |
a90bd866 | 12144 | -- subtype, or more accurately we cannot figure it out. Note that |
82c80734 | 12145 | -- all class-wide types have unknown discriminants. |
996ae0b0 RK |
12146 | |
12147 | elsif Has_Unknown_Discriminants (T) then | |
12148 | AS_Needed := False; | |
12149 | ||
82c80734 RD |
12150 | -- At this stage we have an unconstrained type that may need an |
12151 | -- actual subtype. For sure the actual subtype is needed if we have | |
405b907c AC |
12152 | -- an unconstrained array type. However, in an instance, the type |
12153 | -- may appear as a subtype of the full view, while the actual is | |
12154 | -- in fact private (in which case no actual subtype is needed) so | |
12155 | -- check the kind of the base type. | |
996ae0b0 | 12156 | |
405b907c | 12157 | elsif Is_Array_Type (Base_Type (T)) then |
996ae0b0 RK |
12158 | AS_Needed := True; |
12159 | ||
d8db0bca JM |
12160 | -- The only other case needing an actual subtype is an unconstrained |
12161 | -- record type which is an IN parameter (we cannot generate actual | |
12162 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
12163 | -- change the discriminant values. However we exclude the case of | |
12164 | -- initialization procedures, since discriminants are handled very | |
12165 | -- specially in this context, see the section entitled "Handling of | |
12166 | -- Discriminants" in Einfo. | |
12167 | ||
12168 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
ca90b962 | 12169 | -- in front-end layout mode for size/offset values), since in such |
d8db0bca JM |
12170 | -- functions only discriminants are referenced, and not only are such |
12171 | -- subtypes not needed, but they cannot always be generated, because | |
12172 | -- of order of elaboration issues. | |
996ae0b0 RK |
12173 | |
12174 | elsif Is_Record_Type (T) | |
12175 | and then Ekind (Formal) = E_In_Parameter | |
12176 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 12177 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
12178 | and then not Is_Discrim_SO_Function (Subp) |
12179 | then | |
12180 | AS_Needed := True; | |
12181 | ||
12182 | -- All other cases do not need an actual subtype | |
12183 | ||
12184 | else | |
12185 | AS_Needed := False; | |
12186 | end if; | |
12187 | ||
12188 | -- Generate actual subtypes for unconstrained arrays and | |
12189 | -- unconstrained discriminated records. | |
12190 | ||
12191 | if AS_Needed then | |
7324bf49 | 12192 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 12193 | |
57a8057a | 12194 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
12195 | -- variable that renames the corresponding entry of the |
12196 | -- parameter block, and it is this local variable that may | |
da94696d | 12197 | -- require an actual subtype. |
fbf5a39b | 12198 | |
4460a9bc | 12199 | if Expander_Active then |
fbf5a39b AC |
12200 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
12201 | else | |
12202 | Decl := Build_Actual_Subtype (T, Formal); | |
12203 | end if; | |
12204 | ||
996ae0b0 RK |
12205 | if Present (Handled_Statement_Sequence (N)) then |
12206 | First_Stmt := | |
12207 | First (Statements (Handled_Statement_Sequence (N))); | |
12208 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
12209 | Mark_Rewrite_Insertion (Decl); | |
12210 | else | |
82c80734 RD |
12211 | -- If the accept statement has no body, there will be no |
12212 | -- reference to the actuals, so no need to compute actual | |
12213 | -- subtypes. | |
996ae0b0 RK |
12214 | |
12215 | return; | |
12216 | end if; | |
12217 | ||
12218 | else | |
fbf5a39b | 12219 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
12220 | Prepend (Decl, Declarations (N)); |
12221 | Mark_Rewrite_Insertion (Decl); | |
12222 | end if; | |
12223 | ||
82c80734 RD |
12224 | -- The declaration uses the bounds of an existing object, and |
12225 | -- therefore needs no constraint checks. | |
2820d220 | 12226 | |
7324bf49 | 12227 | Analyze (Decl, Suppress => All_Checks); |
405b907c | 12228 | Set_Is_Actual_Subtype (Defining_Identifier (Decl)); |
2820d220 | 12229 | |
996ae0b0 RK |
12230 | -- We need to freeze manually the generated type when it is |
12231 | -- inserted anywhere else than in a declarative part. | |
12232 | ||
12233 | if Present (First_Stmt) then | |
12234 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 12235 | Freeze_Entity (Defining_Identifier (Decl), N)); |
fcadacf7 ES |
12236 | |
12237 | -- Ditto if the type has a dynamic predicate, because the | |
22da8770 AC |
12238 | -- generated function will mention the actual subtype. The |
12239 | -- predicate may come from an explicit aspect of be inherited. | |
fcadacf7 | 12240 | |
22da8770 | 12241 | elsif Has_Predicates (T) then |
dfdd3de1 | 12242 | Insert_List_After_And_Analyze (Decl, |
fcadacf7 | 12243 | Freeze_Entity (Defining_Identifier (Decl), N)); |
996ae0b0 RK |
12244 | end if; |
12245 | ||
fbf5a39b | 12246 | if Nkind (N) = N_Accept_Statement |
4460a9bc | 12247 | and then Expander_Active |
fbf5a39b AC |
12248 | then |
12249 | Set_Actual_Subtype (Renamed_Object (Formal), | |
12250 | Defining_Identifier (Decl)); | |
12251 | else | |
12252 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
12253 | end if; | |
996ae0b0 RK |
12254 | end if; |
12255 | ||
12256 | Next_Formal (Formal); | |
12257 | end loop; | |
12258 | end Set_Actual_Subtypes; | |
12259 | ||
12260 | --------------------- | |
12261 | -- Set_Formal_Mode -- | |
12262 | --------------------- | |
12263 | ||
12264 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
07aa5e6f | 12265 | Spec : constant Node_Id := Parent (Formal_Id); |
288cbbbd | 12266 | Id : constant Entity_Id := Scope (Formal_Id); |
996ae0b0 RK |
12267 | |
12268 | begin | |
12269 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
12270 | -- since we ensure that corresponding actuals are always valid at the | |
12271 | -- point of the call. | |
12272 | ||
12273 | if Out_Present (Spec) then | |
288cbbbd JM |
12274 | if Ekind_In (Id, E_Entry, E_Entry_Family) |
12275 | or else Is_Subprogram_Or_Generic_Subprogram (Id) | |
12276 | then | |
12277 | Set_Has_Out_Or_In_Out_Parameter (Id, True); | |
12278 | end if; | |
12279 | ||
12280 | if Ekind_In (Id, E_Function, E_Generic_Function) then | |
fc999c5d | 12281 | |
b4ca2d2c | 12282 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
12283 | |
12284 | if Ada_Version >= Ada_2012 then | |
e6425869 AC |
12285 | |
12286 | -- Even in Ada 2012 operators can only have IN parameters | |
12287 | ||
12288 | if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then | |
12289 | Error_Msg_N ("operators can only have IN parameters", Spec); | |
12290 | end if; | |
12291 | ||
c56a9ba4 AC |
12292 | if In_Present (Spec) then |
12293 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
12294 | else | |
12295 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
12296 | end if; | |
12297 | ||
b4ca2d2c AC |
12298 | -- But not in earlier versions of Ada |
12299 | ||
c56a9ba4 AC |
12300 | else |
12301 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
12302 | Set_Ekind (Formal_Id, E_In_Parameter); | |
12303 | end if; | |
996ae0b0 RK |
12304 | |
12305 | elsif In_Present (Spec) then | |
12306 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
12307 | ||
12308 | else | |
fbf5a39b AC |
12309 | Set_Ekind (Formal_Id, E_Out_Parameter); |
12310 | Set_Never_Set_In_Source (Formal_Id, True); | |
12311 | Set_Is_True_Constant (Formal_Id, False); | |
12312 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
12313 | end if; |
12314 | ||
12315 | else | |
12316 | Set_Ekind (Formal_Id, E_In_Parameter); | |
12317 | end if; | |
12318 | ||
fbf5a39b | 12319 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
12320 | -- guarantees that access parameters are always non-null. We also set |
12321 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
12322 | |
12323 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 12324 | |
885c4871 | 12325 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 12326 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 12327 | |
0791fbe9 | 12328 | if Ada_Version < Ada_2005 |
2813bb6b | 12329 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
12330 | then |
12331 | Set_Is_Known_Non_Null (Formal_Id); | |
12332 | Set_Can_Never_Be_Null (Formal_Id); | |
12333 | end if; | |
2813bb6b | 12334 | |
41251c60 JM |
12335 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
12336 | ||
2813bb6b ES |
12337 | elsif Is_Access_Type (Etype (Formal_Id)) |
12338 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
12339 | then | |
2813bb6b | 12340 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
12341 | |
12342 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
12343 | -- access checks) for the case of an IN parameter, which cannot | |
12344 | -- be changed, or for an IN OUT parameter, which can be changed but | |
12345 | -- not to a null value. But for an OUT parameter, the initial value | |
12346 | -- passed in can be null, so we can't set this flag in that case. | |
12347 | ||
12348 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
12349 | Set_Can_Never_Be_Null (Formal_Id); | |
12350 | end if; | |
fbf5a39b AC |
12351 | end if; |
12352 | ||
996ae0b0 RK |
12353 | Set_Mechanism (Formal_Id, Default_Mechanism); |
12354 | Set_Formal_Validity (Formal_Id); | |
12355 | end Set_Formal_Mode; | |
12356 | ||
12357 | ------------------------- | |
12358 | -- Set_Formal_Validity -- | |
12359 | ------------------------- | |
12360 | ||
12361 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
12362 | begin | |
82c80734 RD |
12363 | -- If no validity checking, then we cannot assume anything about the |
12364 | -- validity of parameters, since we do not know there is any checking | |
12365 | -- of the validity on the call side. | |
996ae0b0 RK |
12366 | |
12367 | if not Validity_Checks_On then | |
12368 | return; | |
12369 | ||
fbf5a39b AC |
12370 | -- If validity checking for parameters is enabled, this means we are |
12371 | -- not supposed to make any assumptions about argument values. | |
12372 | ||
12373 | elsif Validity_Check_Parameters then | |
12374 | return; | |
12375 | ||
12376 | -- If we are checking in parameters, we will assume that the caller is | |
12377 | -- also checking parameters, so we can assume the parameter is valid. | |
12378 | ||
996ae0b0 RK |
12379 | elsif Ekind (Formal_Id) = E_In_Parameter |
12380 | and then Validity_Check_In_Params | |
12381 | then | |
12382 | Set_Is_Known_Valid (Formal_Id, True); | |
12383 | ||
fbf5a39b AC |
12384 | -- Similar treatment for IN OUT parameters |
12385 | ||
996ae0b0 RK |
12386 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
12387 | and then Validity_Check_In_Out_Params | |
12388 | then | |
12389 | Set_Is_Known_Valid (Formal_Id, True); | |
12390 | end if; | |
12391 | end Set_Formal_Validity; | |
12392 | ||
12393 | ------------------------ | |
12394 | -- Subtype_Conformant -- | |
12395 | ------------------------ | |
12396 | ||
ce2b6ba5 JM |
12397 | function Subtype_Conformant |
12398 | (New_Id : Entity_Id; | |
12399 | Old_Id : Entity_Id; | |
12400 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
12401 | is | |
996ae0b0 | 12402 | Result : Boolean; |
996ae0b0 | 12403 | begin |
ce2b6ba5 JM |
12404 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
12405 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
12406 | return Result; |
12407 | end Subtype_Conformant; | |
12408 | ||
12409 | --------------------- | |
12410 | -- Type_Conformant -- | |
12411 | --------------------- | |
12412 | ||
41251c60 JM |
12413 | function Type_Conformant |
12414 | (New_Id : Entity_Id; | |
12415 | Old_Id : Entity_Id; | |
12416 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
12417 | is | |
996ae0b0 | 12418 | Result : Boolean; |
996ae0b0 | 12419 | begin |
c8ef728f | 12420 | May_Hide_Profile := False; |
41251c60 JM |
12421 | Check_Conformance |
12422 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
12423 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
12424 | return Result; |
12425 | end Type_Conformant; | |
12426 | ||
12427 | ------------------------------- | |
12428 | -- Valid_Operator_Definition -- | |
12429 | ------------------------------- | |
12430 | ||
12431 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
12432 | N : Integer := 0; | |
12433 | F : Entity_Id; | |
12434 | Id : constant Name_Id := Chars (Designator); | |
12435 | N_OK : Boolean; | |
12436 | ||
12437 | begin | |
12438 | F := First_Formal (Designator); | |
996ae0b0 RK |
12439 | while Present (F) loop |
12440 | N := N + 1; | |
12441 | ||
12442 | if Present (Default_Value (F)) then | |
ed2233dc | 12443 | Error_Msg_N |
996ae0b0 RK |
12444 | ("default values not allowed for operator parameters", |
12445 | Parent (F)); | |
220d1fd9 AC |
12446 | |
12447 | -- For function instantiations that are operators, we must check | |
12448 | -- separately that the corresponding generic only has in-parameters. | |
84c0a895 AC |
12449 | -- For subprogram declarations this is done in Set_Formal_Mode. Such |
12450 | -- an error could not arise in earlier versions of the language. | |
220d1fd9 AC |
12451 | |
12452 | elsif Ekind (F) /= E_In_Parameter then | |
84c0a895 | 12453 | Error_Msg_N ("operators can only have IN parameters", F); |
996ae0b0 RK |
12454 | end if; |
12455 | ||
12456 | Next_Formal (F); | |
12457 | end loop; | |
12458 | ||
12459 | -- Verify that user-defined operators have proper number of arguments | |
12460 | -- First case of operators which can only be unary | |
12461 | ||
b69cd36a | 12462 | if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
996ae0b0 RK |
12463 | N_OK := (N = 1); |
12464 | ||
12465 | -- Case of operators which can be unary or binary | |
12466 | ||
b69cd36a | 12467 | elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
12468 | N_OK := (N in 1 .. 2); |
12469 | ||
12470 | -- All other operators can only be binary | |
12471 | ||
12472 | else | |
12473 | N_OK := (N = 2); | |
12474 | end if; | |
12475 | ||
12476 | if not N_OK then | |
12477 | Error_Msg_N | |
12478 | ("incorrect number of arguments for operator", Designator); | |
12479 | end if; | |
12480 | ||
12481 | if Id = Name_Op_Ne | |
12482 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
12483 | and then not Is_Intrinsic_Subprogram (Designator) | |
12484 | then | |
12485 | Error_Msg_N | |
84c0a895 | 12486 | ("explicit definition of inequality not allowed", Designator); |
996ae0b0 RK |
12487 | end if; |
12488 | end Valid_Operator_Definition; | |
12489 | ||
12490 | end Sem_Ch6; |