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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 | -- -- |
c7b9d548 | 9 | -- Copyright (C) 1992-2011, 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 | ||
26 | with Atree; use Atree; | |
27 | with Checks; use Checks; | |
28 | with Debug; use Debug; | |
29 | with Einfo; use Einfo; | |
30 | with Elists; use Elists; | |
31 | with Errout; use Errout; | |
32 | with Expander; use Expander; | |
ec4867fa | 33 | with Exp_Ch6; use Exp_Ch6; |
996ae0b0 | 34 | with Exp_Ch7; use Exp_Ch7; |
21d27997 | 35 | with Exp_Ch9; use Exp_Ch9; |
ce2b6ba5 | 36 | with Exp_Disp; use Exp_Disp; |
e660dbf7 | 37 | with Exp_Tss; use Exp_Tss; |
ec4867fa | 38 | with Exp_Util; use Exp_Util; |
fbf5a39b | 39 | with Fname; use Fname; |
996ae0b0 | 40 | with Freeze; use Freeze; |
41251c60 | 41 | with Itypes; use Itypes; |
996ae0b0 | 42 | with Lib.Xref; use Lib.Xref; |
ec4867fa | 43 | with Layout; use Layout; |
996ae0b0 RK |
44 | with Namet; use Namet; |
45 | with Lib; use Lib; | |
46 | with Nlists; use Nlists; | |
47 | with Nmake; use Nmake; | |
48 | with Opt; use Opt; | |
49 | with Output; use Output; | |
b20de9b9 AC |
50 | with Restrict; use Restrict; |
51 | with Rident; use Rident; | |
996ae0b0 RK |
52 | with Rtsfind; use Rtsfind; |
53 | with Sem; use Sem; | |
a4100e55 | 54 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
55 | with Sem_Cat; use Sem_Cat; |
56 | with Sem_Ch3; use Sem_Ch3; | |
57 | with Sem_Ch4; use Sem_Ch4; | |
58 | with Sem_Ch5; use Sem_Ch5; | |
59 | with Sem_Ch8; use Sem_Ch8; | |
9bc856dd | 60 | with Sem_Ch10; use Sem_Ch10; |
996ae0b0 | 61 | with Sem_Ch12; use Sem_Ch12; |
0f1a6a0b | 62 | with Sem_Ch13; use Sem_Ch13; |
996ae0b0 RK |
63 | with Sem_Disp; use Sem_Disp; |
64 | with Sem_Dist; use Sem_Dist; | |
65 | with Sem_Elim; use Sem_Elim; | |
66 | with Sem_Eval; use Sem_Eval; | |
67 | with Sem_Mech; use Sem_Mech; | |
68 | with Sem_Prag; use Sem_Prag; | |
69 | with Sem_Res; use Sem_Res; | |
70 | with Sem_Util; use Sem_Util; | |
71 | with Sem_Type; use Sem_Type; | |
72 | with Sem_Warn; use Sem_Warn; | |
73 | with Sinput; use Sinput; | |
74 | with Stand; use Stand; | |
75 | with Sinfo; use Sinfo; | |
76 | with Sinfo.CN; use Sinfo.CN; | |
77 | with Snames; use Snames; | |
78 | with Stringt; use Stringt; | |
79 | with Style; | |
80 | with Stylesw; use Stylesw; | |
81 | with Tbuild; use Tbuild; | |
82 | with Uintp; use Uintp; | |
83 | with Urealp; use Urealp; | |
84 | with Validsw; use Validsw; | |
85 | ||
86 | package body Sem_Ch6 is | |
87 | ||
c8ef728f | 88 | May_Hide_Profile : Boolean := False; |
ec4867fa ES |
89 | -- This flag is used to indicate that two formals in two subprograms being |
90 | -- checked for conformance differ only in that one is an access parameter | |
91 | -- while the other is of a general access type with the same designated | |
92 | -- type. In this case, if the rest of the signatures match, a call to | |
93 | -- either subprogram may be ambiguous, which is worth a warning. The flag | |
94 | -- is set in Compatible_Types, and the warning emitted in | |
95 | -- New_Overloaded_Entity. | |
c8ef728f | 96 | |
996ae0b0 RK |
97 | ----------------------- |
98 | -- Local Subprograms -- | |
99 | ----------------------- | |
100 | ||
5d37ba92 | 101 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 102 | -- Common processing for simple and extended return statements |
ec4867fa ES |
103 | |
104 | procedure Analyze_Function_Return (N : Node_Id); | |
81db9d77 ES |
105 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement |
106 | -- applies to a [generic] function. | |
ec4867fa | 107 | |
82c80734 RD |
108 | procedure Analyze_Return_Type (N : Node_Id); |
109 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 110 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
111 | -- outer homographs. |
112 | ||
b1b543d2 | 113 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
114 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
115 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 116 | |
996ae0b0 | 117 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); |
82c80734 RD |
118 | -- Analyze a generic subprogram body. N is the body to be analyzed, and |
119 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
996ae0b0 | 120 | |
d05ef0ab | 121 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id); |
996ae0b0 RK |
122 | -- If a subprogram has pragma Inline and inlining is active, use generic |
123 | -- machinery to build an unexpanded body for the subprogram. This body is | |
f3d57416 | 124 | -- subsequently used for inline expansions at call sites. If subprogram can |
996ae0b0 RK |
125 | -- be inlined (depending on size and nature of local declarations) this |
126 | -- function returns true. Otherwise subprogram body is treated normally. | |
aa720a54 AC |
127 | -- If proper warnings are enabled and the subprogram contains a construct |
128 | -- that cannot be inlined, the offending construct is flagged accordingly. | |
996ae0b0 | 129 | |
806f6d37 AC |
130 | function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
131 | -- Returns true if Subp can override a predefined operator. | |
132 | ||
996ae0b0 | 133 | procedure Check_Conformance |
41251c60 JM |
134 | (New_Id : Entity_Id; |
135 | Old_Id : Entity_Id; | |
136 | Ctype : Conformance_Type; | |
137 | Errmsg : Boolean; | |
138 | Conforms : out Boolean; | |
139 | Err_Loc : Node_Id := Empty; | |
140 | Get_Inst : Boolean := False; | |
141 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
142 | -- Given two entities, this procedure checks that the profiles associated |
143 | -- with these entities meet the conformance criterion given by the third | |
144 | -- parameter. If they conform, Conforms is set True and control returns | |
145 | -- to the caller. If they do not conform, Conforms is set to False, and | |
146 | -- in addition, if Errmsg is True on the call, proper messages are output | |
147 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
148 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
149 | -- error messages are placed on the appropriate part of the construct | |
150 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
151 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
152 | -- be called. | |
153 | ||
154 | procedure Check_Subprogram_Order (N : Node_Id); | |
155 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
156 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
157 | ||
996ae0b0 RK |
158 | procedure Check_Returns |
159 | (HSS : Node_Id; | |
160 | Mode : Character; | |
c8ef728f ES |
161 | Err : out Boolean; |
162 | Proc : Entity_Id := Empty); | |
163 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 164 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
165 | -- handled statement sequence for the subprogram body. This procedure |
166 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
167 | -- used for functions) or do not have a return (Mode = 'P', used for | |
168 | -- No_Return procedures). The flag Err is set if there are any control | |
169 | -- paths not explicitly terminated by a return in the function case, and is | |
170 | -- True otherwise. Proc is the entity for the procedure case and is used | |
171 | -- in posting the warning message. | |
996ae0b0 | 172 | |
e5a58fac AC |
173 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
174 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
175 | -- must appear before the type is frozen, and have the same visibility as | |
176 | -- that of the type. This procedure checks that this rule is met, and | |
177 | -- otherwise emits an error on the subprogram declaration and a warning | |
178 | -- on the earlier freeze point if it is easy to locate. | |
179 | ||
996ae0b0 | 180 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
181 | -- This procedure makes S, a new overloaded entity, into the first visible |
182 | -- entity with that name. | |
996ae0b0 RK |
183 | |
184 | procedure Install_Entity (E : Entity_Id); | |
0877856b | 185 | -- Make single entity visible (used for generic formals as well) |
996ae0b0 | 186 | |
a5b62485 AC |
187 | function Is_Non_Overriding_Operation |
188 | (Prev_E : Entity_Id; | |
189 | New_E : Entity_Id) return Boolean; | |
190 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
191 | -- overrides an inherited operation only if the corresponding operation | |
192 | -- was overriding in the generic. This can happen for primitive operations | |
193 | -- of types derived (in the generic unit) from formal private or formal | |
194 | -- derived types. | |
195 | ||
996ae0b0 RK |
196 | procedure Make_Inequality_Operator (S : Entity_Id); |
197 | -- Create the declaration for an inequality operator that is implicitly | |
198 | -- created by a user-defined equality operator that yields a boolean. | |
199 | ||
200 | procedure May_Need_Actuals (Fun : Entity_Id); | |
201 | -- Flag functions that can be called without parameters, i.e. those that | |
202 | -- have no parameters, or those for which defaults exist for all parameters | |
203 | ||
21d27997 RD |
204 | procedure Process_PPCs |
205 | (N : Node_Id; | |
206 | Spec_Id : Entity_Id; | |
207 | Body_Id : Entity_Id); | |
3764bb00 BD |
208 | -- Called from Analyze[_Generic]_Subprogram_Body to deal with scanning post |
209 | -- conditions for the body and assembling and inserting the _postconditions | |
210 | -- procedure. N is the node for the subprogram body and Body_Id/Spec_Id are | |
211 | -- the entities for the body and separate spec (if there is no separate | |
b4ca2d2c AC |
212 | -- spec, Spec_Id is Empty). Note that invariants and predicates may also |
213 | -- provide postconditions, and are also handled in this procedure. | |
21d27997 | 214 | |
996ae0b0 RK |
215 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
216 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
217 | -- setting the proper validity status for this entity, which depends on |
218 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
219 | |
220 | --------------------------------------------- | |
221 | -- Analyze_Abstract_Subprogram_Declaration -- | |
222 | --------------------------------------------- | |
223 | ||
224 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
fbf5a39b AC |
225 | Designator : constant Entity_Id := |
226 | Analyze_Subprogram_Specification (Specification (N)); | |
996ae0b0 RK |
227 | Scop : constant Entity_Id := Current_Scope; |
228 | ||
229 | begin | |
2ba431e5 | 230 | Check_SPARK_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 231 | |
996ae0b0 | 232 | Generate_Definition (Designator); |
dac3bede | 233 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
f937473f | 234 | Set_Is_Abstract_Subprogram (Designator); |
996ae0b0 RK |
235 | New_Overloaded_Entity (Designator); |
236 | Check_Delayed_Subprogram (Designator); | |
237 | ||
fbf5a39b | 238 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 RK |
239 | |
240 | if Ekind (Scope (Designator)) = E_Protected_Type then | |
241 | Error_Msg_N | |
242 | ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
243 | |
244 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
245 | -- operation nor an operation that overrides an inherited subprogram or | |
246 | -- predefined operator, since this most likely indicates a mistake. | |
247 | ||
248 | elsif Warn_On_Redundant_Constructs | |
249 | and then not Is_Dispatching_Operation (Designator) | |
038140ed | 250 | and then not Present (Overridden_Operation (Designator)) |
5d37ba92 ES |
251 | and then (not Is_Operator_Symbol_Name (Chars (Designator)) |
252 | or else Scop /= Scope (Etype (First_Formal (Designator)))) | |
253 | then | |
254 | Error_Msg_N | |
255 | ("?abstract subprogram is not dispatching or overriding", N); | |
996ae0b0 | 256 | end if; |
fbf5a39b AC |
257 | |
258 | Generate_Reference_To_Formals (Designator); | |
361effb1 | 259 | Check_Eliminated (Designator); |
eaba57fb RD |
260 | |
261 | if Has_Aspects (N) then | |
262 | Analyze_Aspect_Specifications (N, Designator); | |
263 | end if; | |
996ae0b0 RK |
264 | end Analyze_Abstract_Subprogram_Declaration; |
265 | ||
b0186f71 AC |
266 | --------------------------------- |
267 | -- Analyze_Expression_Function -- | |
268 | --------------------------------- | |
269 | ||
270 | procedure Analyze_Expression_Function (N : Node_Id) is | |
271 | Loc : constant Source_Ptr := Sloc (N); | |
272 | LocX : constant Source_Ptr := Sloc (Expression (N)); | |
273 | Def_Id : constant Entity_Id := Defining_Entity (Specification (N)); | |
274 | New_Body : Node_Id; | |
d2b10647 | 275 | New_Decl : Node_Id; |
b0186f71 AC |
276 | |
277 | Prev : constant Entity_Id := Current_Entity_In_Scope (Def_Id); | |
278 | -- If the expression is a completion, Prev is the entity whose | |
279 | -- declaration is completed. | |
280 | ||
281 | begin | |
282 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 283 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
284 | -- function into an equivalent subprogram body, and analyze it. |
285 | ||
286 | -- Expression functions are inlined unconditionally. The back-end will | |
287 | -- determine whether this is possible. | |
288 | ||
289 | Inline_Processing_Required := True; | |
b0186f71 AC |
290 | |
291 | New_Body := | |
292 | Make_Subprogram_Body (Loc, | |
293 | Specification => Specification (N), | |
294 | Declarations => Empty_List, | |
295 | Handled_Statement_Sequence => | |
296 | Make_Handled_Sequence_Of_Statements (LocX, | |
297 | Statements => New_List ( | |
298 | Make_Simple_Return_Statement (LocX, | |
299 | Expression => Expression (N))))); | |
300 | ||
301 | if Present (Prev) | |
302 | and then Ekind (Prev) = E_Generic_Function | |
303 | then | |
304 | -- If the expression completes a generic subprogram, we must create a | |
305 | -- separate node for the body, because at instantiation the original | |
306 | -- node of the generic copy must be a generic subprogram body, and | |
307 | -- cannot be a expression function. Otherwise we just rewrite the | |
308 | -- expression with the non-generic body. | |
309 | ||
310 | Insert_After (N, New_Body); | |
311 | Rewrite (N, Make_Null_Statement (Loc)); | |
312 | Analyze (N); | |
313 | Analyze (New_Body); | |
d2b10647 | 314 | Set_Is_Inlined (Prev); |
b0186f71 | 315 | |
d2b10647 | 316 | elsif Present (Prev) then |
b0186f71 | 317 | Rewrite (N, New_Body); |
d2b10647 ES |
318 | Set_Is_Inlined (Prev); |
319 | Analyze (N); | |
320 | ||
321 | -- If this is not a completion, create both a declaration and a body, | |
322 | -- so that the expression can be inlined whenever possible. | |
323 | ||
324 | else | |
325 | New_Decl := | |
326 | Make_Subprogram_Declaration (Loc, | |
327 | Specification => Specification (N)); | |
328 | Rewrite (N, New_Decl); | |
b0186f71 | 329 | Analyze (N); |
d2b10647 ES |
330 | Set_Is_Inlined (Defining_Entity (New_Decl)); |
331 | ||
332 | -- Create new set of formals for specification in body. | |
333 | ||
334 | Set_Specification (New_Body, | |
335 | Make_Function_Specification (Loc, | |
336 | Defining_Unit_Name => | |
337 | Make_Defining_Identifier (Loc, Chars (Defining_Entity (N))), | |
338 | Parameter_Specifications => | |
339 | Copy_Parameter_List (Defining_Entity (New_Decl)), | |
340 | Result_Definition => | |
341 | New_Copy_Tree (Result_Definition (Specification (New_Decl))))); | |
342 | ||
343 | Insert_After (N, New_Body); | |
344 | Analyze (New_Body); | |
b0186f71 AC |
345 | end if; |
346 | end Analyze_Expression_Function; | |
347 | ||
ec4867fa ES |
348 | ---------------------------------------- |
349 | -- Analyze_Extended_Return_Statement -- | |
350 | ---------------------------------------- | |
351 | ||
352 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
353 | begin | |
5d37ba92 | 354 | Analyze_Return_Statement (N); |
ec4867fa ES |
355 | end Analyze_Extended_Return_Statement; |
356 | ||
996ae0b0 RK |
357 | ---------------------------- |
358 | -- Analyze_Function_Call -- | |
359 | ---------------------------- | |
360 | ||
361 | procedure Analyze_Function_Call (N : Node_Id) is | |
e24329cd YM |
362 | P : constant Node_Id := Name (N); |
363 | Actuals : constant List_Id := Parameter_Associations (N); | |
364 | Actual : Node_Id; | |
996ae0b0 RK |
365 | |
366 | begin | |
367 | Analyze (P); | |
368 | ||
82c80734 | 369 | -- A call of the form A.B (X) may be an Ada05 call, which is rewritten |
e660dbf7 | 370 | -- as B (A, X). If the rewriting is successful, the call has been |
82c80734 RD |
371 | -- analyzed and we just return. |
372 | ||
373 | if Nkind (P) = N_Selected_Component | |
374 | and then Name (N) /= P | |
375 | and then Is_Rewrite_Substitution (N) | |
376 | and then Present (Etype (N)) | |
377 | then | |
378 | return; | |
379 | end if; | |
380 | ||
996ae0b0 RK |
381 | -- If error analyzing name, then set Any_Type as result type and return |
382 | ||
383 | if Etype (P) = Any_Type then | |
384 | Set_Etype (N, Any_Type); | |
385 | return; | |
386 | end if; | |
387 | ||
388 | -- Otherwise analyze the parameters | |
389 | ||
e24329cd YM |
390 | if Present (Actuals) then |
391 | Actual := First (Actuals); | |
996ae0b0 RK |
392 | while Present (Actual) loop |
393 | Analyze (Actual); | |
394 | Check_Parameterless_Call (Actual); | |
395 | Next (Actual); | |
396 | end loop; | |
397 | end if; | |
398 | ||
399 | Analyze_Call (N); | |
996ae0b0 RK |
400 | end Analyze_Function_Call; |
401 | ||
ec4867fa ES |
402 | ----------------------------- |
403 | -- Analyze_Function_Return -- | |
404 | ----------------------------- | |
405 | ||
406 | procedure Analyze_Function_Return (N : Node_Id) is | |
407 | Loc : constant Source_Ptr := Sloc (N); | |
408 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
409 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
410 | ||
5d37ba92 | 411 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
412 | -- Function result subtype |
413 | ||
414 | procedure Check_Limited_Return (Expr : Node_Id); | |
415 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
416 | -- limited types. Used only for simple return statements. | |
417 | -- Expr is the expression returned. | |
418 | ||
419 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
420 | -- Check that the return_subtype_indication properly matches the result | |
421 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
422 | ||
423 | -------------------------- | |
424 | -- Check_Limited_Return -- | |
425 | -------------------------- | |
426 | ||
427 | procedure Check_Limited_Return (Expr : Node_Id) is | |
428 | begin | |
429 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
430 | -- removed and replaced by anonymous access results. This is an | |
431 | -- incompatibility with Ada 95. Not clear whether this should be | |
432 | -- enforced yet or perhaps controllable with special switch. ??? | |
433 | ||
434 | if Is_Limited_Type (R_Type) | |
435 | and then Comes_From_Source (N) | |
436 | and then not In_Instance_Body | |
2a31c32b | 437 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
438 | then |
439 | -- Error in Ada 2005 | |
440 | ||
0791fbe9 | 441 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
442 | and then not Debug_Flag_Dot_L |
443 | and then not GNAT_Mode | |
444 | then | |
445 | Error_Msg_N | |
446 | ("(Ada 2005) cannot copy object of a limited type " & | |
5d37ba92 | 447 | "(RM-2005 6.5(5.5/2))", Expr); |
e0ae93e2 | 448 | |
40f07b4b | 449 | if Is_Immutably_Limited_Type (R_Type) then |
ec4867fa ES |
450 | Error_Msg_N |
451 | ("\return by reference not permitted in Ada 2005", Expr); | |
452 | end if; | |
453 | ||
454 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
455 | -- incompatibility. | |
456 | ||
457 | -- In GNAT mode, this is just a warning, to allow it to be | |
458 | -- evilly turned off. Otherwise it is a real error. | |
459 | ||
9694c039 AC |
460 | -- In a generic context, simplify the warning because it makes |
461 | -- no sense to discuss pass-by-reference or copy. | |
462 | ||
ec4867fa | 463 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
464 | if Inside_A_Generic then |
465 | Error_Msg_N | |
20261dc1 AC |
466 | ("return of limited object not permitted in Ada2005 " |
467 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
9694c039 AC |
468 | |
469 | elsif Is_Immutably_Limited_Type (R_Type) then | |
ec4867fa | 470 | Error_Msg_N |
20261dc1 AC |
471 | ("return by reference not permitted in Ada 2005 " |
472 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
ec4867fa ES |
473 | else |
474 | Error_Msg_N | |
20261dc1 AC |
475 | ("cannot copy object of a limited type in Ada 2005 " |
476 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
ec4867fa ES |
477 | end if; |
478 | ||
479 | -- Ada 95 mode, compatibility warnings disabled | |
480 | ||
481 | else | |
482 | return; -- skip continuation messages below | |
483 | end if; | |
484 | ||
9694c039 AC |
485 | if not Inside_A_Generic then |
486 | Error_Msg_N | |
487 | ("\consider switching to return of access type", Expr); | |
488 | Explain_Limited_Type (R_Type, Expr); | |
489 | end if; | |
ec4867fa ES |
490 | end if; |
491 | end Check_Limited_Return; | |
492 | ||
493 | ------------------------------------- | |
494 | -- Check_Return_Subtype_Indication -- | |
495 | ------------------------------------- | |
496 | ||
497 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
498 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
499 | ||
500 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
501 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
502 | |
503 | Subtype_Ind : constant Node_Id := | |
504 | Object_Definition (Original_Node (Obj_Decl)); | |
505 | ||
506 | R_Type_Is_Anon_Access : | |
507 | constant Boolean := | |
508 | Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type | |
509 | or else | |
510 | Ekind (R_Type) = E_Anonymous_Access_Protected_Subprogram_Type | |
511 | or else | |
512 | Ekind (R_Type) = E_Anonymous_Access_Type; | |
513 | -- True if return type of the function is an anonymous access type | |
514 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
515 | ||
516 | R_Stm_Type_Is_Anon_Access : | |
517 | constant Boolean := | |
0a36105d | 518 | Ekind (R_Stm_Type) = E_Anonymous_Access_Subprogram_Type |
ec4867fa | 519 | or else |
0a36105d | 520 | Ekind (R_Stm_Type) = E_Anonymous_Access_Protected_Subprogram_Type |
ec4867fa | 521 | or else |
0a36105d | 522 | Ekind (R_Stm_Type) = E_Anonymous_Access_Type; |
ec4867fa ES |
523 | -- True if type of the return object is an anonymous access type |
524 | ||
525 | begin | |
7665e4bd | 526 | -- First, avoid cascaded errors |
ec4867fa ES |
527 | |
528 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
529 | return; | |
530 | end if; | |
531 | ||
532 | -- "return access T" case; check that the return statement also has | |
533 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 534 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
535 | |
536 | if R_Type_Is_Anon_Access then | |
537 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
538 | if |
539 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 540 | then |
53cf4600 ES |
541 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
542 | Base_Type (Designated_Type (R_Type)) | |
543 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
544 | then | |
545 | Error_Msg_N | |
546 | ("subtype must statically match function result subtype", | |
547 | Subtype_Mark (Subtype_Ind)); | |
548 | end if; | |
549 | ||
550 | else | |
551 | -- For two anonymous access to subprogram types, the | |
552 | -- types themselves must be type conformant. | |
553 | ||
554 | if not Conforming_Types | |
555 | (R_Stm_Type, R_Type, Fully_Conformant) | |
556 | then | |
557 | Error_Msg_N | |
558 | ("subtype must statically match function result subtype", | |
559 | Subtype_Ind); | |
560 | end if; | |
ec4867fa | 561 | end if; |
0a36105d | 562 | |
ec4867fa ES |
563 | else |
564 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
565 | end if; | |
566 | ||
81d93365 AC |
567 | -- Subtype indication case: check that the return object's type is |
568 | -- covered by the result type, and that the subtypes statically match | |
569 | -- when the result subtype is constrained. Also handle record types | |
570 | -- with unknown discriminants for which we have built the underlying | |
571 | -- record view. Coverage is needed to allow specific-type return | |
572 | -- objects when the result type is class-wide (see AI05-32). | |
573 | ||
574 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 575 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
576 | and then |
577 | Covers | |
578 | (Base_Type (R_Type), | |
579 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
580 | then |
581 | -- A null exclusion may be present on the return type, on the | |
582 | -- function specification, on the object declaration or on the | |
583 | -- subtype itself. | |
ec4867fa | 584 | |
21d27997 RD |
585 | if Is_Access_Type (R_Type) |
586 | and then | |
587 | (Can_Never_Be_Null (R_Type) | |
588 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
589 | Can_Never_Be_Null (R_Stm_Type) | |
590 | then | |
591 | Error_Msg_N | |
592 | ("subtype must statically match function result subtype", | |
593 | Subtype_Ind); | |
594 | end if; | |
595 | ||
105b5e65 | 596 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
597 | |
598 | if Is_Constrained (R_Type) | |
599 | or else Is_Access_Type (R_Type) | |
600 | then | |
ec4867fa ES |
601 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
602 | Error_Msg_N | |
0a36105d JM |
603 | ("subtype must statically match function result subtype", |
604 | Subtype_Ind); | |
ec4867fa ES |
605 | end if; |
606 | end if; | |
607 | ||
ff7139c3 AC |
608 | elsif Etype (Base_Type (R_Type)) = R_Stm_Type |
609 | and then Is_Null_Extension (Base_Type (R_Type)) | |
610 | then | |
611 | null; | |
612 | ||
ec4867fa ES |
613 | else |
614 | Error_Msg_N | |
615 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
616 | end if; | |
617 | end Check_Return_Subtype_Indication; | |
618 | ||
619 | --------------------- | |
620 | -- Local Variables -- | |
621 | --------------------- | |
622 | ||
623 | Expr : Node_Id; | |
624 | ||
625 | -- Start of processing for Analyze_Function_Return | |
626 | ||
627 | begin | |
628 | Set_Return_Present (Scope_Id); | |
629 | ||
5d37ba92 | 630 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 631 | Expr := Expression (N); |
4ee646da | 632 | |
e917aec2 RD |
633 | -- Guard against a malformed expression. The parser may have tried to |
634 | -- recover but the node is not analyzable. | |
4ee646da AC |
635 | |
636 | if Nkind (Expr) = N_Error then | |
637 | Set_Etype (Expr, Any_Type); | |
638 | Expander_Mode_Save_And_Set (False); | |
639 | return; | |
640 | ||
641 | else | |
0180fd26 AC |
642 | -- The resolution of a controlled [extension] aggregate associated |
643 | -- with a return statement creates a temporary which needs to be | |
644 | -- finalized on function exit. Wrap the return statement inside a | |
645 | -- block so that the finalization machinery can detect this case. | |
646 | -- This early expansion is done only when the return statement is | |
647 | -- not part of a handled sequence of statements. | |
648 | ||
649 | if Nkind_In (Expr, N_Aggregate, | |
650 | N_Extension_Aggregate) | |
651 | and then Needs_Finalization (R_Type) | |
652 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
653 | then | |
654 | Rewrite (N, | |
655 | Make_Block_Statement (Loc, | |
656 | Handled_Statement_Sequence => | |
657 | Make_Handled_Sequence_Of_Statements (Loc, | |
658 | Statements => New_List (Relocate_Node (N))))); | |
659 | ||
660 | Analyze (N); | |
661 | return; | |
662 | end if; | |
663 | ||
4ee646da AC |
664 | Analyze_And_Resolve (Expr, R_Type); |
665 | Check_Limited_Return (Expr); | |
666 | end if; | |
ec4867fa | 667 | |
ad05f2e9 | 668 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 669 | |
fe5d3068 | 670 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
671 | and then |
672 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 673 | or else Present (Next (N))) |
607d0635 | 674 | then |
2ba431e5 | 675 | Check_SPARK_Restriction |
fe5d3068 | 676 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
677 | end if; |
678 | ||
ec4867fa | 679 | else |
2ba431e5 | 680 | Check_SPARK_Restriction ("extended RETURN is not allowed", N); |
607d0635 | 681 | |
ec4867fa ES |
682 | -- Analyze parts specific to extended_return_statement: |
683 | ||
684 | declare | |
685 | Obj_Decl : constant Node_Id := | |
686 | Last (Return_Object_Declarations (N)); | |
687 | ||
688 | HSS : constant Node_Id := Handled_Statement_Sequence (N); | |
689 | ||
690 | begin | |
691 | Expr := Expression (Obj_Decl); | |
692 | ||
693 | -- Note: The check for OK_For_Limited_Init will happen in | |
694 | -- Analyze_Object_Declaration; we treat it as a normal | |
695 | -- object declaration. | |
696 | ||
cd1c668b | 697 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
698 | Analyze (Obj_Decl); |
699 | ||
ec4867fa ES |
700 | Check_Return_Subtype_Indication (Obj_Decl); |
701 | ||
702 | if Present (HSS) then | |
703 | Analyze (HSS); | |
704 | ||
705 | if Present (Exception_Handlers (HSS)) then | |
706 | ||
707 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
708 | -- Probably by creating an actual N_Block_Statement. | |
709 | -- Probably in Expand. | |
710 | ||
711 | null; | |
712 | end if; | |
713 | end if; | |
714 | ||
9337aa0a AC |
715 | -- Mark the return object as referenced, since the return is an |
716 | -- implicit reference of the object. | |
717 | ||
718 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
719 | ||
ec4867fa ES |
720 | Check_References (Stm_Entity); |
721 | end; | |
722 | end if; | |
723 | ||
21d27997 | 724 | -- Case of Expr present |
5d37ba92 | 725 | |
ec4867fa | 726 | if Present (Expr) |
21d27997 RD |
727 | |
728 | -- Defend against previous errors | |
729 | ||
730 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 731 | and then Present (Etype (Expr)) |
ec4867fa | 732 | then |
5d37ba92 ES |
733 | -- Apply constraint check. Note that this is done before the implicit |
734 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 735 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
736 | -- with null-excluding expressions found in return statements. |
737 | ||
738 | Apply_Constraint_Check (Expr, R_Type); | |
739 | ||
740 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
741 | -- type, apply an implicit conversion of the expression to that type | |
742 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 743 | |
0791fbe9 | 744 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
745 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
746 | then | |
747 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
748 | Analyze_And_Resolve (Expr, R_Type); | |
749 | end if; | |
750 | ||
21d27997 RD |
751 | -- If the result type is class-wide, then check that the return |
752 | -- expression's type is not declared at a deeper level than the | |
753 | -- function (RM05-6.5(5.6/2)). | |
754 | ||
0791fbe9 | 755 | if Ada_Version >= Ada_2005 |
21d27997 RD |
756 | and then Is_Class_Wide_Type (R_Type) |
757 | then | |
758 | if Type_Access_Level (Etype (Expr)) > | |
759 | Subprogram_Access_Level (Scope_Id) | |
760 | then | |
761 | Error_Msg_N | |
762 | ("level of return expression type is deeper than " & | |
763 | "class-wide function!", Expr); | |
764 | end if; | |
765 | end if; | |
766 | ||
4755cce9 JM |
767 | -- Check incorrect use of dynamically tagged expression |
768 | ||
769 | if Is_Tagged_Type (R_Type) then | |
770 | Check_Dynamically_Tagged_Expression | |
771 | (Expr => Expr, | |
772 | Typ => R_Type, | |
773 | Related_Nod => N); | |
ec4867fa ES |
774 | end if; |
775 | ||
ec4867fa ES |
776 | -- ??? A real run-time accessibility check is needed in cases |
777 | -- involving dereferences of access parameters. For now we just | |
778 | -- check the static cases. | |
779 | ||
0791fbe9 | 780 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
40f07b4b | 781 | and then Is_Immutably_Limited_Type (Etype (Scope_Id)) |
ec4867fa ES |
782 | and then Object_Access_Level (Expr) > |
783 | Subprogram_Access_Level (Scope_Id) | |
784 | then | |
ec4867fa | 785 | |
9694c039 AC |
786 | -- Suppress the message in a generic, where the rewriting |
787 | -- is irrelevant. | |
788 | ||
789 | if Inside_A_Generic then | |
790 | null; | |
791 | ||
792 | else | |
793 | Rewrite (N, | |
794 | Make_Raise_Program_Error (Loc, | |
795 | Reason => PE_Accessibility_Check_Failed)); | |
796 | Analyze (N); | |
797 | ||
798 | Error_Msg_N | |
799 | ("cannot return a local value by reference?", N); | |
800 | Error_Msg_NE | |
801 | ("\& will be raised at run time?", | |
802 | N, Standard_Program_Error); | |
803 | end if; | |
ec4867fa | 804 | end if; |
5d37ba92 ES |
805 | |
806 | if Known_Null (Expr) | |
807 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
808 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
809 | then | |
810 | Apply_Compile_Time_Constraint_Error | |
811 | (N => Expr, | |
812 | Msg => "(Ada 2005) null not allowed for " | |
813 | & "null-excluding return?", | |
814 | Reason => CE_Null_Not_Allowed); | |
815 | end if; | |
cd5a9750 AC |
816 | |
817 | -- Apply checks suggested by AI05-0144 (dangerous order dependence) | |
cd5a9750 | 818 | |
1e194575 | 819 | Check_Order_Dependence; |
ec4867fa ES |
820 | end if; |
821 | end Analyze_Function_Return; | |
822 | ||
996ae0b0 RK |
823 | ------------------------------------- |
824 | -- Analyze_Generic_Subprogram_Body -- | |
825 | ------------------------------------- | |
826 | ||
827 | procedure Analyze_Generic_Subprogram_Body | |
828 | (N : Node_Id; | |
829 | Gen_Id : Entity_Id) | |
830 | is | |
fbf5a39b | 831 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 832 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 833 | Body_Id : Entity_Id; |
996ae0b0 | 834 | New_N : Node_Id; |
fbf5a39b | 835 | Spec : Node_Id; |
996ae0b0 RK |
836 | |
837 | begin | |
82c80734 RD |
838 | -- Copy body and disable expansion while analyzing the generic For a |
839 | -- stub, do not copy the stub (which would load the proper body), this | |
840 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
841 | |
842 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
843 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
844 | Rewrite (N, New_N); | |
845 | Start_Generic; | |
846 | end if; | |
847 | ||
848 | Spec := Specification (N); | |
849 | ||
850 | -- Within the body of the generic, the subprogram is callable, and | |
851 | -- behaves like the corresponding non-generic unit. | |
852 | ||
fbf5a39b | 853 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
854 | |
855 | if Kind = E_Generic_Procedure | |
856 | and then Nkind (Spec) /= N_Procedure_Specification | |
857 | then | |
fbf5a39b | 858 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
859 | return; |
860 | ||
861 | elsif Kind = E_Generic_Function | |
862 | and then Nkind (Spec) /= N_Function_Specification | |
863 | then | |
fbf5a39b | 864 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
865 | return; |
866 | end if; | |
867 | ||
fbf5a39b | 868 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
869 | |
870 | if Has_Completion (Gen_Id) | |
871 | and then Nkind (Parent (N)) /= N_Subunit | |
872 | then | |
873 | Error_Msg_N ("duplicate generic body", N); | |
874 | return; | |
875 | else | |
876 | Set_Has_Completion (Gen_Id); | |
877 | end if; | |
878 | ||
879 | if Nkind (N) = N_Subprogram_Body_Stub then | |
880 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
881 | else | |
882 | Set_Corresponding_Spec (N, Gen_Id); | |
883 | end if; | |
884 | ||
885 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
886 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
887 | end if; | |
888 | ||
889 | -- Make generic parameters immediately visible in the body. They are | |
890 | -- needed to process the formals declarations. Then make the formals | |
891 | -- visible in a separate step. | |
892 | ||
0a36105d | 893 | Push_Scope (Gen_Id); |
996ae0b0 RK |
894 | |
895 | declare | |
896 | E : Entity_Id; | |
897 | First_Ent : Entity_Id; | |
898 | ||
899 | begin | |
900 | First_Ent := First_Entity (Gen_Id); | |
901 | ||
902 | E := First_Ent; | |
903 | while Present (E) and then not Is_Formal (E) loop | |
904 | Install_Entity (E); | |
905 | Next_Entity (E); | |
906 | end loop; | |
907 | ||
908 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
909 | ||
910 | -- Now generic formals are visible, and the specification can be | |
911 | -- analyzed, for subsequent conformance check. | |
912 | ||
fbf5a39b | 913 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 914 | |
fbf5a39b | 915 | -- Make formal parameters visible |
996ae0b0 RK |
916 | |
917 | if Present (E) then | |
918 | ||
fbf5a39b AC |
919 | -- E is the first formal parameter, we loop through the formals |
920 | -- installing them so that they will be visible. | |
996ae0b0 RK |
921 | |
922 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
923 | while Present (E) loop |
924 | Install_Entity (E); | |
925 | Next_Formal (E); | |
926 | end loop; | |
927 | end if; | |
928 | ||
e895b435 | 929 | -- Visible generic entity is callable within its own body |
996ae0b0 | 930 | |
ec4867fa ES |
931 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
932 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
933 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
934 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
935 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
fbf5a39b AC |
936 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
937 | ||
938 | if Nkind (N) = N_Subprogram_Body_Stub then | |
939 | ||
e895b435 | 940 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
941 | |
942 | Set_Ekind (Gen_Id, Kind); | |
943 | Set_Ekind (Body_Id, Kind); | |
944 | ||
945 | if Present (First_Ent) then | |
946 | Set_First_Entity (Gen_Id, First_Ent); | |
947 | end if; | |
948 | ||
949 | End_Scope; | |
950 | return; | |
951 | end if; | |
996ae0b0 | 952 | |
82c80734 RD |
953 | -- If this is a compilation unit, it must be made visible explicitly, |
954 | -- because the compilation of the declaration, unlike other library | |
955 | -- unit declarations, does not. If it is not a unit, the following | |
956 | -- is redundant but harmless. | |
996ae0b0 RK |
957 | |
958 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 959 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 960 | |
ec4867fa ES |
961 | if Is_Child_Unit (Gen_Id) then |
962 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
963 | end if; | |
964 | ||
996ae0b0 | 965 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 AC |
966 | |
967 | -- Deal with preconditions and postconditions. In formal verification | |
968 | -- mode, we keep pre- and postconditions attached to entities rather | |
969 | -- than inserted in the code, in order to facilitate a distinct | |
970 | -- treatment for them. | |
971 | ||
972 | if not ALFA_Mode then | |
973 | Process_PPCs (N, Gen_Id, Body_Id); | |
974 | end if; | |
0dabde3a ES |
975 | |
976 | -- If the generic unit carries pre- or post-conditions, copy them | |
977 | -- to the original generic tree, so that they are properly added | |
978 | -- to any instantiation. | |
979 | ||
980 | declare | |
981 | Orig : constant Node_Id := Original_Node (N); | |
982 | Cond : Node_Id; | |
983 | ||
984 | begin | |
985 | Cond := First (Declarations (N)); | |
986 | while Present (Cond) loop | |
987 | if Nkind (Cond) = N_Pragma | |
988 | and then Pragma_Name (Cond) = Name_Check | |
989 | then | |
990 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
991 | ||
992 | elsif Nkind (Cond) = N_Pragma | |
993 | and then Pragma_Name (Cond) = Name_Postcondition | |
994 | then | |
995 | Set_Ekind (Defining_Entity (Orig), Ekind (Gen_Id)); | |
996 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
997 | else | |
998 | exit; | |
999 | end if; | |
1000 | ||
1001 | Next (Cond); | |
1002 | end loop; | |
1003 | end; | |
1004 | ||
996ae0b0 RK |
1005 | Analyze_Declarations (Declarations (N)); |
1006 | Check_Completion; | |
1007 | Analyze (Handled_Statement_Sequence (N)); | |
1008 | ||
1009 | Save_Global_References (Original_Node (N)); | |
1010 | ||
82c80734 RD |
1011 | -- Prior to exiting the scope, include generic formals again (if any |
1012 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1013 | |
1014 | if Present (First_Ent) then | |
1015 | Set_First_Entity (Gen_Id, First_Ent); | |
1016 | end if; | |
1017 | ||
fbf5a39b | 1018 | Check_References (Gen_Id); |
996ae0b0 RK |
1019 | end; |
1020 | ||
e6f69614 | 1021 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1022 | End_Scope; |
1023 | Check_Subprogram_Order (N); | |
1024 | ||
e895b435 | 1025 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1026 | |
1027 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1028 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1029 | |
1030 | if Style_Check then | |
1031 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1032 | end if; | |
13d923cc | 1033 | |
996ae0b0 | 1034 | End_Generic; |
996ae0b0 RK |
1035 | end Analyze_Generic_Subprogram_Body; |
1036 | ||
1037 | ----------------------------- | |
1038 | -- Analyze_Operator_Symbol -- | |
1039 | ----------------------------- | |
1040 | ||
82c80734 RD |
1041 | -- An operator symbol such as "+" or "and" may appear in context where the |
1042 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1043 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1044 | -- generates this node, and the semantics does the disambiguation. Other | |
1045 | -- such case are actuals in an instantiation, the generic unit in an | |
1046 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1047 | |
1048 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1049 | Par : constant Node_Id := Parent (N); | |
1050 | ||
1051 | begin | |
800621e0 RD |
1052 | if (Nkind (Par) = N_Function_Call |
1053 | and then N = Name (Par)) | |
996ae0b0 | 1054 | or else Nkind (Par) = N_Function_Instantiation |
800621e0 RD |
1055 | or else (Nkind (Par) = N_Indexed_Component |
1056 | and then N = Prefix (Par)) | |
996ae0b0 RK |
1057 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1058 | and then not Is_Pragma_String_Literal (Par)) | |
1059 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration | |
800621e0 RD |
1060 | or else (Nkind (Par) = N_Attribute_Reference |
1061 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1062 | then |
1063 | Find_Direct_Name (N); | |
1064 | ||
1065 | else | |
1066 | Change_Operator_Symbol_To_String_Literal (N); | |
1067 | Analyze (N); | |
1068 | end if; | |
1069 | end Analyze_Operator_Symbol; | |
1070 | ||
1071 | ----------------------------------- | |
1072 | -- Analyze_Parameter_Association -- | |
1073 | ----------------------------------- | |
1074 | ||
1075 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1076 | begin | |
1077 | Analyze (Explicit_Actual_Parameter (N)); | |
1078 | end Analyze_Parameter_Association; | |
1079 | ||
1080 | ---------------------------- | |
1081 | -- Analyze_Procedure_Call -- | |
1082 | ---------------------------- | |
1083 | ||
1084 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
1085 | Loc : constant Source_Ptr := Sloc (N); | |
1086 | P : constant Node_Id := Name (N); | |
1087 | Actuals : constant List_Id := Parameter_Associations (N); | |
1088 | Actual : Node_Id; | |
1089 | New_N : Node_Id; | |
1090 | ||
1091 | procedure Analyze_Call_And_Resolve; | |
1092 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1093 | -- At end, check illegal order dependence. |
996ae0b0 | 1094 | |
fbf5a39b AC |
1095 | ------------------------------ |
1096 | -- Analyze_Call_And_Resolve -- | |
1097 | ------------------------------ | |
1098 | ||
996ae0b0 RK |
1099 | procedure Analyze_Call_And_Resolve is |
1100 | begin | |
1101 | if Nkind (N) = N_Procedure_Call_Statement then | |
1102 | Analyze_Call (N); | |
1103 | Resolve (N, Standard_Void_Type); | |
cd5a9750 | 1104 | |
1e194575 | 1105 | -- Apply checks suggested by AI05-0144 |
cd5a9750 | 1106 | |
1e194575 | 1107 | Check_Order_Dependence; |
cd5a9750 | 1108 | |
996ae0b0 RK |
1109 | else |
1110 | Analyze (N); | |
1111 | end if; | |
1112 | end Analyze_Call_And_Resolve; | |
1113 | ||
1114 | -- Start of processing for Analyze_Procedure_Call | |
1115 | ||
1116 | begin | |
1117 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1118 | -- a procedure call or an entry call. The prefix may denote an access | |
1119 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1120 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1121 | -- then the construct denotes a call to a member of an entire family. |
1122 | -- If the prefix is a simple name, it may still denote a call to a | |
1123 | -- parameterless member of an entry family. Resolution of these various | |
1124 | -- interpretations is delicate. | |
1125 | ||
1126 | Analyze (P); | |
1127 | ||
758c442c GD |
1128 | -- If this is a call of the form Obj.Op, the call may have been |
1129 | -- analyzed and possibly rewritten into a block, in which case | |
1130 | -- we are done. | |
1131 | ||
1132 | if Analyzed (N) then | |
1133 | return; | |
1134 | end if; | |
1135 | ||
7415029d AC |
1136 | -- If there is an error analyzing the name (which may have been |
1137 | -- rewritten if the original call was in prefix notation) then error | |
1138 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1139 | |
7415029d AC |
1140 | if Error_Posted (N) |
1141 | or else Etype (Name (N)) = Any_Type | |
1142 | then | |
996ae0b0 RK |
1143 | Set_Etype (N, Any_Type); |
1144 | return; | |
1145 | end if; | |
1146 | ||
1147 | -- Otherwise analyze the parameters | |
1148 | ||
1149 | if Present (Actuals) then | |
1150 | Actual := First (Actuals); | |
1151 | ||
1152 | while Present (Actual) loop | |
1153 | Analyze (Actual); | |
1154 | Check_Parameterless_Call (Actual); | |
1155 | Next (Actual); | |
1156 | end loop; | |
1157 | end if; | |
1158 | ||
0bfc9a64 | 1159 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1160 | |
1161 | if Nkind (P) = N_Attribute_Reference | |
1162 | and then (Attribute_Name (P) = Name_Elab_Spec | |
0bfc9a64 AC |
1163 | or else Attribute_Name (P) = Name_Elab_Body |
1164 | or else Attribute_Name (P) = Name_Elab_Subp_Body) | |
996ae0b0 RK |
1165 | then |
1166 | if Present (Actuals) then | |
1167 | Error_Msg_N | |
1168 | ("no parameters allowed for this call", First (Actuals)); | |
1169 | return; | |
1170 | end if; | |
1171 | ||
1172 | Set_Etype (N, Standard_Void_Type); | |
1173 | Set_Analyzed (N); | |
1174 | ||
1175 | elsif Is_Entity_Name (P) | |
1176 | and then Is_Record_Type (Etype (Entity (P))) | |
1177 | and then Remote_AST_I_Dereference (P) | |
1178 | then | |
1179 | return; | |
1180 | ||
1181 | elsif Is_Entity_Name (P) | |
1182 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1183 | then | |
1184 | if Is_Access_Type (Etype (P)) | |
1185 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1186 | and then No (Actuals) | |
1187 | and then Comes_From_Source (N) | |
1188 | then | |
ed2233dc | 1189 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1190 | end if; |
1191 | ||
1192 | Analyze_Call_And_Resolve; | |
1193 | ||
1194 | -- If the prefix is the simple name of an entry family, this is | |
1195 | -- a parameterless call from within the task body itself. | |
1196 | ||
1197 | elsif Is_Entity_Name (P) | |
1198 | and then Nkind (P) = N_Identifier | |
1199 | and then Ekind (Entity (P)) = E_Entry_Family | |
1200 | and then Present (Actuals) | |
1201 | and then No (Next (First (Actuals))) | |
1202 | then | |
82c80734 RD |
1203 | -- Can be call to parameterless entry family. What appears to be the |
1204 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1205 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1206 | -- transformation. |
1207 | ||
1208 | New_N := | |
1209 | Make_Indexed_Component (Loc, | |
1210 | Prefix => | |
1211 | Make_Selected_Component (Loc, | |
1212 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1213 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1214 | Expressions => Actuals); | |
1215 | Set_Name (N, New_N); | |
1216 | Set_Etype (New_N, Standard_Void_Type); | |
1217 | Set_Parameter_Associations (N, No_List); | |
1218 | Analyze_Call_And_Resolve; | |
1219 | ||
1220 | elsif Nkind (P) = N_Explicit_Dereference then | |
1221 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1222 | Analyze_Call_And_Resolve; | |
1223 | else | |
1224 | Error_Msg_N ("expect access to procedure in call", P); | |
1225 | end if; | |
1226 | ||
82c80734 RD |
1227 | -- The name can be a selected component or an indexed component that |
1228 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1229 | -- has parameter associations. | |
996ae0b0 RK |
1230 | |
1231 | elsif Is_Access_Type (Etype (P)) | |
1232 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1233 | then | |
1234 | if Present (Actuals) then | |
1235 | Analyze_Call_And_Resolve; | |
1236 | else | |
ed2233dc | 1237 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1238 | end if; |
1239 | ||
82c80734 RD |
1240 | -- If not an access to subprogram, then the prefix must resolve to the |
1241 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1242 | |
82c80734 RD |
1243 | -- For the case of a simple entry call, P is a selected component where |
1244 | -- the prefix is the task and the selector name is the entry. A call to | |
1245 | -- a protected procedure will have the same syntax. If the protected | |
1246 | -- object contains overloaded operations, the entity may appear as a | |
1247 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1248 | |
1249 | elsif Nkind (P) = N_Selected_Component | |
1250 | and then (Ekind (Entity (Selector_Name (P))) = E_Entry | |
1251 | or else | |
1252 | Ekind (Entity (Selector_Name (P))) = E_Procedure | |
1253 | or else | |
1254 | Ekind (Entity (Selector_Name (P))) = E_Function) | |
1255 | then | |
1256 | Analyze_Call_And_Resolve; | |
1257 | ||
1258 | elsif Nkind (P) = N_Selected_Component | |
1259 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1260 | and then Present (Actuals) | |
1261 | and then No (Next (First (Actuals))) | |
1262 | then | |
82c80734 RD |
1263 | -- Can be call to parameterless entry family. What appears to be the |
1264 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1265 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1266 | -- transformation. |
1267 | ||
1268 | New_N := | |
1269 | Make_Indexed_Component (Loc, | |
1270 | Prefix => New_Copy (P), | |
1271 | Expressions => Actuals); | |
1272 | Set_Name (N, New_N); | |
1273 | Set_Etype (New_N, Standard_Void_Type); | |
1274 | Set_Parameter_Associations (N, No_List); | |
1275 | Analyze_Call_And_Resolve; | |
1276 | ||
1277 | -- For the case of a reference to an element of an entry family, P is | |
1278 | -- an indexed component whose prefix is a selected component (task and | |
1279 | -- entry family), and whose index is the entry family index. | |
1280 | ||
1281 | elsif Nkind (P) = N_Indexed_Component | |
1282 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1283 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1284 | then | |
1285 | Analyze_Call_And_Resolve; | |
1286 | ||
1287 | -- If the prefix is the name of an entry family, it is a call from | |
1288 | -- within the task body itself. | |
1289 | ||
1290 | elsif Nkind (P) = N_Indexed_Component | |
1291 | and then Nkind (Prefix (P)) = N_Identifier | |
1292 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1293 | then | |
1294 | New_N := | |
1295 | Make_Selected_Component (Loc, | |
1296 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1297 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1298 | Rewrite (Prefix (P), New_N); | |
1299 | Analyze (P); | |
1300 | Analyze_Call_And_Resolve; | |
1301 | ||
e895b435 | 1302 | -- Anything else is an error |
996ae0b0 RK |
1303 | |
1304 | else | |
758c442c | 1305 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 RK |
1306 | end if; |
1307 | end Analyze_Procedure_Call; | |
1308 | ||
b0186f71 AC |
1309 | ------------------------------ |
1310 | -- Analyze_Return_Statement -- | |
1311 | ------------------------------ | |
1312 | ||
1313 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1314 | ||
1315 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1316 | N_Extended_Return_Statement)); | |
1317 | ||
1318 | Returns_Object : constant Boolean := | |
1319 | Nkind (N) = N_Extended_Return_Statement | |
1320 | or else | |
1321 | (Nkind (N) = N_Simple_Return_Statement | |
1322 | and then Present (Expression (N))); | |
1323 | -- True if we're returning something; that is, "return <expression>;" | |
1324 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1325 | -- checking: If Returns_Object is True, N should apply to a function | |
1326 | -- body; otherwise N should apply to a procedure body, entry body, | |
1327 | -- accept statement, or extended return statement. | |
1328 | ||
1329 | function Find_What_It_Applies_To return Entity_Id; | |
1330 | -- Find the entity representing the innermost enclosing body, accept | |
1331 | -- statement, or extended return statement. If the result is a callable | |
1332 | -- construct or extended return statement, then this will be the value | |
1333 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1334 | -- illegal. See RM-6.5(4/2). | |
1335 | ||
1336 | ----------------------------- | |
1337 | -- Find_What_It_Applies_To -- | |
1338 | ----------------------------- | |
1339 | ||
1340 | function Find_What_It_Applies_To return Entity_Id is | |
1341 | Result : Entity_Id := Empty; | |
1342 | ||
1343 | begin | |
1344 | -- Loop outward through the Scope_Stack, skipping blocks and loops | |
1345 | ||
1346 | for J in reverse 0 .. Scope_Stack.Last loop | |
1347 | Result := Scope_Stack.Table (J).Entity; | |
1348 | exit when Ekind (Result) /= E_Block and then | |
1349 | Ekind (Result) /= E_Loop; | |
1350 | end loop; | |
1351 | ||
1352 | pragma Assert (Present (Result)); | |
1353 | return Result; | |
1354 | end Find_What_It_Applies_To; | |
1355 | ||
1356 | -- Local declarations | |
1357 | ||
1358 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1359 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1360 | Loc : constant Source_Ptr := Sloc (N); | |
1361 | Stm_Entity : constant Entity_Id := | |
1362 | New_Internal_Entity | |
1363 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1364 | ||
1365 | -- Start of processing for Analyze_Return_Statement | |
1366 | ||
1367 | begin | |
1368 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1369 | ||
1370 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1371 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1372 | ||
1373 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1374 | -- (4/2): an inner return statement will apply to this extended return. | |
1375 | ||
1376 | if Nkind (N) = N_Extended_Return_Statement then | |
1377 | Push_Scope (Stm_Entity); | |
1378 | end if; | |
1379 | ||
1380 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1381 | -- implicitly-generated return that is placed at the end. | |
1382 | ||
1383 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1384 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1385 | end if; | |
1386 | ||
1387 | -- Warn on any unassigned OUT parameters if in procedure | |
1388 | ||
1389 | if Ekind (Scope_Id) = E_Procedure then | |
1390 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1391 | end if; | |
1392 | ||
1393 | -- Check that functions return objects, and other things do not | |
1394 | ||
1395 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1396 | if not Returns_Object then | |
1397 | Error_Msg_N ("missing expression in return from function", N); | |
1398 | end if; | |
1399 | ||
1400 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1401 | if Returns_Object then | |
1402 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1403 | end if; | |
1404 | ||
1405 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1406 | if Returns_Object then | |
1407 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1408 | Error_Msg_N ("entry body cannot return value", N); | |
1409 | else | |
1410 | Error_Msg_N ("accept statement cannot return value", N); | |
1411 | end if; | |
1412 | end if; | |
1413 | ||
1414 | elsif Kind = E_Return_Statement then | |
1415 | ||
1416 | -- We are nested within another return statement, which must be an | |
1417 | -- extended_return_statement. | |
1418 | ||
1419 | if Returns_Object then | |
1420 | Error_Msg_N | |
1421 | ("extended_return_statement cannot return value; " & | |
1422 | "use `""RETURN;""`", N); | |
1423 | end if; | |
1424 | ||
1425 | else | |
1426 | Error_Msg_N ("illegal context for return statement", N); | |
1427 | end if; | |
1428 | ||
1429 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1430 | Analyze_Function_Return (N); | |
1431 | ||
1432 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1433 | Set_Return_Present (Scope_Id); | |
1434 | end if; | |
1435 | ||
1436 | if Nkind (N) = N_Extended_Return_Statement then | |
1437 | End_Scope; | |
1438 | end if; | |
1439 | ||
1440 | Kill_Current_Values (Last_Assignment_Only => True); | |
1441 | Check_Unreachable_Code (N); | |
1442 | end Analyze_Return_Statement; | |
1443 | ||
5d37ba92 ES |
1444 | ------------------------------------- |
1445 | -- Analyze_Simple_Return_Statement -- | |
1446 | ------------------------------------- | |
ec4867fa | 1447 | |
5d37ba92 | 1448 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1449 | begin |
5d37ba92 ES |
1450 | if Present (Expression (N)) then |
1451 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1452 | end if; |
1453 | ||
5d37ba92 ES |
1454 | Analyze_Return_Statement (N); |
1455 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1456 | |
82c80734 RD |
1457 | ------------------------- |
1458 | -- Analyze_Return_Type -- | |
1459 | ------------------------- | |
1460 | ||
1461 | procedure Analyze_Return_Type (N : Node_Id) is | |
1462 | Designator : constant Entity_Id := Defining_Entity (N); | |
1463 | Typ : Entity_Id := Empty; | |
1464 | ||
1465 | begin | |
ec4867fa ES |
1466 | -- Normal case where result definition does not indicate an error |
1467 | ||
41251c60 JM |
1468 | if Result_Definition (N) /= Error then |
1469 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
2ba431e5 | 1470 | Check_SPARK_Restriction |
fe5d3068 | 1471 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1472 | |
b1c11e0e JM |
1473 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1474 | ||
1475 | declare | |
1476 | AD : constant Node_Id := | |
1477 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1478 | begin | |
1479 | if Present (AD) and then Protected_Present (AD) then | |
1480 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1481 | else | |
1482 | Typ := Access_Definition (N, Result_Definition (N)); | |
1483 | end if; | |
1484 | end; | |
1485 | ||
41251c60 JM |
1486 | Set_Parent (Typ, Result_Definition (N)); |
1487 | Set_Is_Local_Anonymous_Access (Typ); | |
1488 | Set_Etype (Designator, Typ); | |
1489 | ||
b66c3ff4 AC |
1490 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1491 | ||
1492 | Null_Exclusion_Static_Checks (N); | |
1493 | ||
41251c60 JM |
1494 | -- Subtype_Mark case |
1495 | ||
1496 | else | |
1497 | Find_Type (Result_Definition (N)); | |
1498 | Typ := Entity (Result_Definition (N)); | |
1499 | Set_Etype (Designator, Typ); | |
1500 | ||
2ba431e5 | 1501 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1502 | |
fe5d3068 | 1503 | if Is_Array_Type (Typ) |
daec8eeb YM |
1504 | and then not Is_Constrained (Typ) |
1505 | then | |
2ba431e5 | 1506 | Check_SPARK_Restriction |
fe5d3068 | 1507 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1508 | Result_Definition (N)); |
daec8eeb YM |
1509 | end if; |
1510 | ||
b66c3ff4 AC |
1511 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1512 | ||
1513 | Null_Exclusion_Static_Checks (N); | |
1514 | ||
1515 | -- If a null exclusion is imposed on the result type, then create | |
1516 | -- a null-excluding itype (an access subtype) and use it as the | |
1517 | -- function's Etype. Note that the null exclusion checks are done | |
1518 | -- right before this, because they don't get applied to types that | |
1519 | -- do not come from source. | |
1520 | ||
1521 | if Is_Access_Type (Typ) | |
1522 | and then Null_Exclusion_Present (N) | |
1523 | then | |
1524 | Set_Etype (Designator, | |
1525 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
1526 | (T => Typ, |
1527 | Related_Nod => N, | |
1528 | Scope_Id => Scope (Current_Scope))); | |
1529 | ||
1530 | -- The new subtype must be elaborated before use because | |
1531 | -- it is visible outside of the function. However its base | |
1532 | -- type may not be frozen yet, so the reference that will | |
1533 | -- force elaboration must be attached to the freezing of | |
1534 | -- the base type. | |
1535 | ||
212863c0 AC |
1536 | -- If the return specification appears on a proper body, |
1537 | -- the subtype will have been created already on the spec. | |
1538 | ||
ff7139c3 | 1539 | if Is_Frozen (Typ) then |
212863c0 AC |
1540 | if Nkind (Parent (N)) = N_Subprogram_Body |
1541 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
1542 | then | |
1543 | null; | |
1544 | else | |
1545 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
1546 | end if; | |
1547 | ||
ff7139c3 AC |
1548 | else |
1549 | Ensure_Freeze_Node (Typ); | |
1550 | ||
1551 | declare | |
212863c0 | 1552 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
1553 | begin |
1554 | Set_Itype (IR, Etype (Designator)); | |
1555 | Append_Freeze_Actions (Typ, New_List (IR)); | |
1556 | end; | |
1557 | end if; | |
1558 | ||
b66c3ff4 AC |
1559 | else |
1560 | Set_Etype (Designator, Typ); | |
1561 | end if; | |
1562 | ||
41251c60 | 1563 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
1564 | and then Is_Value_Type (Typ) |
1565 | then | |
1566 | null; | |
1567 | ||
1568 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 JM |
1569 | or else (Is_Class_Wide_Type (Typ) |
1570 | and then | |
1571 | Ekind (Root_Type (Typ)) = E_Incomplete_Type) | |
1572 | then | |
dd386db0 AC |
1573 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
1574 | -- parts. Untagged incomplete types are not allowed in bodies. | |
1575 | ||
1576 | if Ada_Version >= Ada_2012 then | |
1577 | if Is_Tagged_Type (Typ) then | |
1578 | null; | |
1579 | ||
1580 | elsif Nkind_In (Parent (Parent (N)), | |
1581 | N_Accept_Statement, | |
1582 | N_Entry_Body, | |
1583 | N_Subprogram_Body) | |
1584 | then | |
1585 | Error_Msg_NE | |
1586 | ("invalid use of untagged incomplete type&", | |
1587 | Designator, Typ); | |
1588 | end if; | |
1589 | ||
1590 | else | |
1591 | Error_Msg_NE | |
1592 | ("invalid use of incomplete type&", Designator, Typ); | |
1593 | end if; | |
41251c60 | 1594 | end if; |
82c80734 RD |
1595 | end if; |
1596 | ||
ec4867fa ES |
1597 | -- Case where result definition does indicate an error |
1598 | ||
82c80734 RD |
1599 | else |
1600 | Set_Etype (Designator, Any_Type); | |
1601 | end if; | |
1602 | end Analyze_Return_Type; | |
1603 | ||
996ae0b0 RK |
1604 | ----------------------------- |
1605 | -- Analyze_Subprogram_Body -- | |
1606 | ----------------------------- | |
1607 | ||
b1b543d2 BD |
1608 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
1609 | Loc : constant Source_Ptr := Sloc (N); | |
1610 | Body_Spec : constant Node_Id := Specification (N); | |
1611 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
1612 | ||
1613 | begin | |
1614 | if Debug_Flag_C then | |
1615 | Write_Str ("==> subprogram body "); | |
1616 | Write_Name (Chars (Body_Id)); | |
1617 | Write_Str (" from "); | |
1618 | Write_Location (Loc); | |
1619 | Write_Eol; | |
1620 | Indent; | |
1621 | end if; | |
1622 | ||
1623 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
1624 | ||
1625 | -- The real work is split out into the helper, so it can do "return;" | |
1626 | -- without skipping the debug output: | |
1627 | ||
1628 | Analyze_Subprogram_Body_Helper (N); | |
1629 | ||
1630 | if Debug_Flag_C then | |
1631 | Outdent; | |
1632 | Write_Str ("<== subprogram body "); | |
1633 | Write_Name (Chars (Body_Id)); | |
1634 | Write_Str (" from "); | |
1635 | Write_Location (Loc); | |
1636 | Write_Eol; | |
1637 | end if; | |
1638 | end Analyze_Subprogram_Body; | |
1639 | ||
1640 | ------------------------------------ | |
1641 | -- Analyze_Subprogram_Body_Helper -- | |
1642 | ------------------------------------ | |
1643 | ||
996ae0b0 RK |
1644 | -- This procedure is called for regular subprogram bodies, generic bodies, |
1645 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
1646 | -- specification matters, and is used to create a proper declaration for | |
1647 | -- the subprogram, or to perform conformance checks. | |
1648 | ||
b1b543d2 | 1649 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b | 1650 | Loc : constant Source_Ptr := Sloc (N); |
33931112 | 1651 | Body_Deleted : constant Boolean := False; |
fbf5a39b AC |
1652 | Body_Spec : constant Node_Id := Specification (N); |
1653 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
1654 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 1655 | Conformant : Boolean; |
21d27997 | 1656 | HSS : Node_Id; |
07fc65c4 | 1657 | P_Ent : Entity_Id; |
21d27997 RD |
1658 | Prot_Typ : Entity_Id := Empty; |
1659 | Spec_Id : Entity_Id; | |
1660 | Spec_Decl : Node_Id := Empty; | |
1661 | ||
1662 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
1663 | -- When we analyze a separate spec, the entity chain ends up containing | |
1664 | -- the formals, as well as any itypes generated during analysis of the | |
1665 | -- default expressions for parameters, or the arguments of associated | |
1666 | -- precondition/postcondition pragmas (which are analyzed in the context | |
1667 | -- of the spec since they have visibility on formals). | |
1668 | -- | |
1669 | -- These entities belong with the spec and not the body. However we do | |
1670 | -- the analysis of the body in the context of the spec (again to obtain | |
1671 | -- visibility to the formals), and all the entities generated during | |
1672 | -- this analysis end up also chained to the entity chain of the spec. | |
1673 | -- But they really belong to the body, and there is circuitry to move | |
1674 | -- them from the spec to the body. | |
1675 | -- | |
1676 | -- However, when we do this move, we don't want to move the real spec | |
1677 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
1678 | -- variable points to the last real spec entity, so we only move those | |
1679 | -- chained beyond that point. It is initialized to Empty to deal with | |
1680 | -- the case where there is no separate spec. | |
996ae0b0 | 1681 | |
ec4867fa | 1682 | procedure Check_Anonymous_Return; |
e50e1c5e | 1683 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
1684 | -- or a type that contains tasks, we must create a master entity for |
1685 | -- the anonymous type, which typically will be used in an allocator | |
1686 | -- in the body of the function. | |
1687 | ||
e660dbf7 JM |
1688 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
1689 | -- Look ahead to recognize a pragma that may appear after the body. | |
1690 | -- If there is a previous spec, check that it appears in the same | |
1691 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
1692 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
1693 | -- If the body acts as a spec, and inlining is required, we create a | |
1694 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
1695 | -- If pragma does not appear after the body, check whether there is |
1696 | -- an inline pragma before any local declarations. | |
c37bb106 | 1697 | |
7665e4bd AC |
1698 | procedure Check_Missing_Return; |
1699 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
1700 | -- the warning checks implemented by Check_Returns. In formal mode, also |
1701 | -- verify that a function ends with a RETURN and that a procedure does | |
1702 | -- not contain any RETURN. | |
7665e4bd | 1703 | |
d44202ba HK |
1704 | function Disambiguate_Spec return Entity_Id; |
1705 | -- When a primitive is declared between the private view and the full | |
1706 | -- view of a concurrent type which implements an interface, a special | |
1707 | -- mechanism is used to find the corresponding spec of the primitive | |
1708 | -- body. | |
1709 | ||
1710 | function Is_Private_Concurrent_Primitive | |
1711 | (Subp_Id : Entity_Id) return Boolean; | |
1712 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
1713 | -- type that implements an interface and has a private view. | |
1714 | ||
76a69663 ES |
1715 | procedure Set_Trivial_Subprogram (N : Node_Id); |
1716 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
1717 | -- subprogram whose body is being analyzed. N is the statement node | |
1718 | -- causing the flag to be set, if the following statement is a return | |
1719 | -- of an entity, we mark the entity as set in source to suppress any | |
1720 | -- warning on the stylized use of function stubs with a dummy return. | |
1721 | ||
758c442c GD |
1722 | procedure Verify_Overriding_Indicator; |
1723 | -- If there was a previous spec, the entity has been entered in the | |
1724 | -- current scope previously. If the body itself carries an overriding | |
1725 | -- indicator, check that it is consistent with the known status of the | |
1726 | -- entity. | |
1727 | ||
ec4867fa ES |
1728 | ---------------------------- |
1729 | -- Check_Anonymous_Return -- | |
1730 | ---------------------------- | |
1731 | ||
1732 | procedure Check_Anonymous_Return is | |
1733 | Decl : Node_Id; | |
a523b302 | 1734 | Par : Node_Id; |
ec4867fa ES |
1735 | Scop : Entity_Id; |
1736 | ||
1737 | begin | |
1738 | if Present (Spec_Id) then | |
1739 | Scop := Spec_Id; | |
1740 | else | |
1741 | Scop := Body_Id; | |
1742 | end if; | |
1743 | ||
1744 | if Ekind (Scop) = E_Function | |
1745 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 JM |
1746 | and then not Is_Thunk (Scop) |
1747 | and then (Has_Task (Designated_Type (Etype (Scop))) | |
1748 | or else | |
1749 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) | |
1750 | and then | |
1751 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 1752 | and then Expander_Active |
b20de9b9 AC |
1753 | |
1754 | -- Avoid cases with no tasking support | |
1755 | ||
1756 | and then RTE_Available (RE_Current_Master) | |
1757 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
1758 | then |
1759 | Decl := | |
1760 | Make_Object_Declaration (Loc, | |
1761 | Defining_Identifier => | |
1762 | Make_Defining_Identifier (Loc, Name_uMaster), | |
1763 | Constant_Present => True, | |
1764 | Object_Definition => | |
1765 | New_Reference_To (RTE (RE_Master_Id), Loc), | |
1766 | Expression => | |
1767 | Make_Explicit_Dereference (Loc, | |
1768 | New_Reference_To (RTE (RE_Current_Master), Loc))); | |
1769 | ||
1770 | if Present (Declarations (N)) then | |
1771 | Prepend (Decl, Declarations (N)); | |
1772 | else | |
1773 | Set_Declarations (N, New_List (Decl)); | |
1774 | end if; | |
1775 | ||
1776 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
1777 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
1778 | |
1779 | -- Now mark the containing scope as a task master | |
1780 | ||
1781 | Par := N; | |
1782 | while Nkind (Par) /= N_Compilation_Unit loop | |
1783 | Par := Parent (Par); | |
1784 | pragma Assert (Present (Par)); | |
1785 | ||
1786 | -- If we fall off the top, we are at the outer level, and | |
1787 | -- the environment task is our effective master, so nothing | |
1788 | -- to mark. | |
1789 | ||
1790 | if Nkind_In | |
1791 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
1792 | then | |
1793 | Set_Is_Task_Master (Par, True); | |
1794 | exit; | |
1795 | end if; | |
1796 | end loop; | |
ec4867fa ES |
1797 | end if; |
1798 | end Check_Anonymous_Return; | |
1799 | ||
e660dbf7 JM |
1800 | ------------------------- |
1801 | -- Check_Inline_Pragma -- | |
1802 | ------------------------- | |
758c442c | 1803 | |
e660dbf7 JM |
1804 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
1805 | Prag : Node_Id; | |
1806 | Plist : List_Id; | |
0fb2ea01 | 1807 | |
21d27997 | 1808 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 1809 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 1810 | -- to this subprogram. |
21d27997 RD |
1811 | |
1812 | ----------------------- | |
1813 | -- Is_Inline_Pragma -- | |
1814 | ----------------------- | |
1815 | ||
1816 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
1817 | begin | |
1818 | return | |
1819 | Nkind (N) = N_Pragma | |
1820 | and then | |
1821 | (Pragma_Name (N) = Name_Inline_Always | |
1822 | or else | |
1823 | (Front_End_Inlining | |
1824 | and then Pragma_Name (N) = Name_Inline)) | |
1825 | and then | |
1826 | Chars | |
1827 | (Expression (First (Pragma_Argument_Associations (N)))) | |
1828 | = Chars (Body_Id); | |
1829 | end Is_Inline_Pragma; | |
1830 | ||
1831 | -- Start of processing for Check_Inline_Pragma | |
1832 | ||
c37bb106 | 1833 | begin |
e660dbf7 JM |
1834 | if not Expander_Active then |
1835 | return; | |
1836 | end if; | |
1837 | ||
1838 | if Is_List_Member (N) | |
1839 | and then Present (Next (N)) | |
21d27997 | 1840 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
1841 | then |
1842 | Prag := Next (N); | |
1843 | ||
21d27997 RD |
1844 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
1845 | and then Present (Declarations (N)) | |
1846 | and then Is_Inline_Pragma (First (Declarations (N))) | |
1847 | then | |
1848 | Prag := First (Declarations (N)); | |
1849 | ||
e660dbf7 JM |
1850 | else |
1851 | Prag := Empty; | |
c37bb106 | 1852 | end if; |
e660dbf7 JM |
1853 | |
1854 | if Present (Prag) then | |
1855 | if Present (Spec_Id) then | |
30196a76 | 1856 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
1857 | Analyze (Prag); |
1858 | end if; | |
1859 | ||
1860 | else | |
d39d6bb8 | 1861 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
1862 | |
1863 | declare | |
1864 | Subp : constant Entity_Id := | |
30196a76 | 1865 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 1866 | Decl : constant Node_Id := |
30196a76 RD |
1867 | Make_Subprogram_Declaration (Loc, |
1868 | Specification => | |
1869 | New_Copy_Tree (Specification (N))); | |
1870 | ||
e660dbf7 JM |
1871 | begin |
1872 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
1873 | ||
1874 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 1875 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
1876 | Set_Parameter_Specifications |
1877 | (Specification (Decl), Plist); | |
1878 | end if; | |
1879 | ||
1880 | Insert_Before (N, Decl); | |
1881 | Analyze (Decl); | |
1882 | Analyze (Prag); | |
1883 | Set_Has_Pragma_Inline (Subp); | |
1884 | ||
76a69663 | 1885 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 1886 | Set_Is_Inlined (Subp); |
21d27997 | 1887 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
1888 | end if; |
1889 | ||
1890 | Spec := Subp; | |
1891 | end; | |
1892 | end if; | |
1893 | end if; | |
1894 | end Check_Inline_Pragma; | |
1895 | ||
7665e4bd AC |
1896 | -------------------------- |
1897 | -- Check_Missing_Return -- | |
1898 | -------------------------- | |
1899 | ||
1900 | procedure Check_Missing_Return is | |
1901 | Id : Entity_Id; | |
1902 | Missing_Ret : Boolean; | |
1903 | ||
1904 | begin | |
1905 | if Nkind (Body_Spec) = N_Function_Specification then | |
1906 | if Present (Spec_Id) then | |
1907 | Id := Spec_Id; | |
1908 | else | |
1909 | Id := Body_Id; | |
1910 | end if; | |
1911 | ||
fe5d3068 | 1912 | if Return_Present (Id) then |
7665e4bd AC |
1913 | Check_Returns (HSS, 'F', Missing_Ret); |
1914 | ||
1915 | if Missing_Ret then | |
1916 | Set_Has_Missing_Return (Id); | |
1917 | end if; | |
1918 | ||
1919 | elsif (Is_Generic_Subprogram (Id) | |
1920 | or else not Is_Machine_Code_Subprogram (Id)) | |
1921 | and then not Body_Deleted | |
1922 | then | |
1923 | Error_Msg_N ("missing RETURN statement in function body", N); | |
1924 | end if; | |
1925 | ||
fe5d3068 | 1926 | -- If procedure with No_Return, check returns |
607d0635 | 1927 | |
fe5d3068 YM |
1928 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
1929 | and then Present (Spec_Id) | |
1930 | and then No_Return (Spec_Id) | |
607d0635 | 1931 | then |
fe5d3068 YM |
1932 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
1933 | end if; | |
1934 | ||
ad05f2e9 | 1935 | -- Special checks in SPARK mode |
fe5d3068 YM |
1936 | |
1937 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 1938 | |
ad05f2e9 | 1939 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
1940 | |
1941 | declare | |
1942 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
1943 | begin | |
1944 | if Present (Stat) | |
7394c8cc AC |
1945 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
1946 | N_Extended_Return_Statement) | |
fe5d3068 | 1947 | then |
2ba431e5 | 1948 | Check_SPARK_Restriction |
fe5d3068 YM |
1949 | ("last statement in function should be RETURN", Stat); |
1950 | end if; | |
1951 | end; | |
1952 | ||
ad05f2e9 | 1953 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
1954 | |
1955 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
1956 | if Present (Spec_Id) then |
1957 | Id := Spec_Id; | |
1958 | else | |
1959 | Id := Body_Id; | |
1960 | end if; | |
1961 | ||
8d606a78 RD |
1962 | -- Would be nice to point to return statement here, can we |
1963 | -- borrow the Check_Returns procedure here ??? | |
1964 | ||
607d0635 | 1965 | if Return_Present (Id) then |
2ba431e5 | 1966 | Check_SPARK_Restriction |
fe5d3068 | 1967 | ("procedure should not have RETURN", N); |
607d0635 | 1968 | end if; |
7665e4bd AC |
1969 | end if; |
1970 | end Check_Missing_Return; | |
1971 | ||
d44202ba HK |
1972 | ----------------------- |
1973 | -- Disambiguate_Spec -- | |
1974 | ----------------------- | |
1975 | ||
1976 | function Disambiguate_Spec return Entity_Id is | |
1977 | Priv_Spec : Entity_Id; | |
1978 | Spec_N : Entity_Id; | |
1979 | ||
1980 | procedure Replace_Types (To_Corresponding : Boolean); | |
1981 | -- Depending on the flag, replace the type of formal parameters of | |
1982 | -- Body_Id if it is a concurrent type implementing interfaces with | |
1983 | -- the corresponding record type or the other way around. | |
1984 | ||
1985 | procedure Replace_Types (To_Corresponding : Boolean) is | |
1986 | Formal : Entity_Id; | |
1987 | Formal_Typ : Entity_Id; | |
1988 | ||
1989 | begin | |
1990 | Formal := First_Formal (Body_Id); | |
1991 | while Present (Formal) loop | |
1992 | Formal_Typ := Etype (Formal); | |
1993 | ||
df3e68b1 HK |
1994 | if Is_Class_Wide_Type (Formal_Typ) then |
1995 | Formal_Typ := Root_Type (Formal_Typ); | |
1996 | end if; | |
1997 | ||
d44202ba HK |
1998 | -- From concurrent type to corresponding record |
1999 | ||
2000 | if To_Corresponding then | |
2001 | if Is_Concurrent_Type (Formal_Typ) | |
2002 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
2003 | and then Present (Interfaces ( | |
2004 | Corresponding_Record_Type (Formal_Typ))) | |
2005 | then | |
2006 | Set_Etype (Formal, | |
2007 | Corresponding_Record_Type (Formal_Typ)); | |
2008 | end if; | |
2009 | ||
2010 | -- From corresponding record to concurrent type | |
2011 | ||
2012 | else | |
2013 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2014 | and then Present (Interfaces (Formal_Typ)) | |
2015 | then | |
2016 | Set_Etype (Formal, | |
2017 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2018 | end if; | |
2019 | end if; | |
2020 | ||
2021 | Next_Formal (Formal); | |
2022 | end loop; | |
2023 | end Replace_Types; | |
2024 | ||
2025 | -- Start of processing for Disambiguate_Spec | |
2026 | ||
2027 | begin | |
2028 | -- Try to retrieve the specification of the body as is. All error | |
2029 | -- messages are suppressed because the body may not have a spec in | |
2030 | -- its current state. | |
2031 | ||
2032 | Spec_N := Find_Corresponding_Spec (N, False); | |
2033 | ||
2034 | -- It is possible that this is the body of a primitive declared | |
2035 | -- between a private and a full view of a concurrent type. The | |
2036 | -- controlling parameter of the spec carries the concurrent type, | |
2037 | -- not the corresponding record type as transformed by Analyze_ | |
2038 | -- Subprogram_Specification. In such cases, we undo the change | |
2039 | -- made by the analysis of the specification and try to find the | |
2040 | -- spec again. | |
766d7add | 2041 | |
8198b93d HK |
2042 | -- Note that wrappers already have their corresponding specs and |
2043 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2044 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2045 | -- original concurrent status. |
d44202ba | 2046 | |
8198b93d HK |
2047 | if No (Spec_N) |
2048 | or else Is_Primitive_Wrapper (Spec_N) | |
2049 | then | |
d44202ba HK |
2050 | -- Restore all references of corresponding record types to the |
2051 | -- original concurrent types. | |
2052 | ||
2053 | Replace_Types (To_Corresponding => False); | |
2054 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2055 | ||
2056 | -- The current body truly belongs to a primitive declared between | |
2057 | -- a private and a full view. We leave the modified body as is, | |
2058 | -- and return the true spec. | |
2059 | ||
2060 | if Present (Priv_Spec) | |
2061 | and then Is_Private_Primitive (Priv_Spec) | |
2062 | then | |
2063 | return Priv_Spec; | |
2064 | end if; | |
2065 | ||
2066 | -- In case that this is some sort of error, restore the original | |
2067 | -- state of the body. | |
2068 | ||
2069 | Replace_Types (To_Corresponding => True); | |
2070 | end if; | |
2071 | ||
2072 | return Spec_N; | |
2073 | end Disambiguate_Spec; | |
2074 | ||
2075 | ------------------------------------- | |
2076 | -- Is_Private_Concurrent_Primitive -- | |
2077 | ------------------------------------- | |
2078 | ||
2079 | function Is_Private_Concurrent_Primitive | |
2080 | (Subp_Id : Entity_Id) return Boolean | |
2081 | is | |
2082 | Formal_Typ : Entity_Id; | |
2083 | ||
2084 | begin | |
2085 | if Present (First_Formal (Subp_Id)) then | |
2086 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2087 | ||
2088 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2089 | if Is_Class_Wide_Type (Formal_Typ) then |
2090 | Formal_Typ := Root_Type (Formal_Typ); | |
2091 | end if; | |
2092 | ||
d44202ba HK |
2093 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2094 | end if; | |
2095 | ||
2096 | -- The type of the first formal is a concurrent tagged type with | |
2097 | -- a private view. | |
2098 | ||
2099 | return | |
2100 | Is_Concurrent_Type (Formal_Typ) | |
2101 | and then Is_Tagged_Type (Formal_Typ) | |
2102 | and then Has_Private_Declaration (Formal_Typ); | |
2103 | end if; | |
2104 | ||
2105 | return False; | |
2106 | end Is_Private_Concurrent_Primitive; | |
2107 | ||
76a69663 ES |
2108 | ---------------------------- |
2109 | -- Set_Trivial_Subprogram -- | |
2110 | ---------------------------- | |
2111 | ||
2112 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2113 | Nxt : constant Node_Id := Next (N); | |
2114 | ||
2115 | begin | |
2116 | Set_Is_Trivial_Subprogram (Body_Id); | |
2117 | ||
2118 | if Present (Spec_Id) then | |
2119 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2120 | end if; | |
2121 | ||
2122 | if Present (Nxt) | |
2123 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2124 | and then No (Next (Nxt)) | |
2125 | and then Present (Expression (Nxt)) | |
2126 | and then Is_Entity_Name (Expression (Nxt)) | |
2127 | then | |
2128 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2129 | end if; | |
2130 | end Set_Trivial_Subprogram; | |
2131 | ||
758c442c GD |
2132 | --------------------------------- |
2133 | -- Verify_Overriding_Indicator -- | |
2134 | --------------------------------- | |
2135 | ||
2136 | procedure Verify_Overriding_Indicator is | |
2137 | begin | |
21d27997 RD |
2138 | if Must_Override (Body_Spec) then |
2139 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
2140 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2141 | then | |
2142 | null; | |
2143 | ||
038140ed | 2144 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2145 | Error_Msg_NE |
21d27997 RD |
2146 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
2147 | end if; | |
758c442c | 2148 | |
5d37ba92 | 2149 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2150 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2151 | Error_Msg_NE |
5d37ba92 | 2152 | ("subprogram& overrides inherited operation", |
76a69663 | 2153 | Body_Spec, Spec_Id); |
5d37ba92 | 2154 | |
21d27997 RD |
2155 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
2156 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2157 | then | |
ed2233dc | 2158 | Error_Msg_NE |
21d27997 RD |
2159 | ("subprogram & overrides predefined operator ", |
2160 | Body_Spec, Spec_Id); | |
2161 | ||
618fb570 AC |
2162 | -- If this is not a primitive operation or protected subprogram, |
2163 | -- then the overriding indicator is altogether illegal. | |
5d37ba92 | 2164 | |
618fb570 AC |
2165 | elsif not Is_Primitive (Spec_Id) |
2166 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type | |
2167 | then | |
ed2233dc | 2168 | Error_Msg_N |
19d846a0 RD |
2169 | ("overriding indicator only allowed " & |
2170 | "if subprogram is primitive", | |
2171 | Body_Spec); | |
5d37ba92 | 2172 | end if; |
235f4375 | 2173 | |
806f6d37 | 2174 | elsif Style_Check |
038140ed | 2175 | and then Present (Overridden_Operation (Spec_Id)) |
235f4375 AC |
2176 | then |
2177 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2178 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
2179 | |
2180 | elsif Style_Check | |
2181 | and then Can_Override_Operator (Spec_Id) | |
2182 | and then not Is_Predefined_File_Name | |
2183 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
2184 | then | |
2185 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2186 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
2187 | end if; |
2188 | end Verify_Overriding_Indicator; | |
2189 | ||
b1b543d2 | 2190 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 2191 | |
996ae0b0 | 2192 | begin |
82c80734 RD |
2193 | -- Generic subprograms are handled separately. They always have a |
2194 | -- generic specification. Determine whether current scope has a | |
2195 | -- previous declaration. | |
996ae0b0 | 2196 | |
82c80734 RD |
2197 | -- If the subprogram body is defined within an instance of the same |
2198 | -- name, the instance appears as a package renaming, and will be hidden | |
2199 | -- within the subprogram. | |
996ae0b0 RK |
2200 | |
2201 | if Present (Prev_Id) | |
2202 | and then not Is_Overloadable (Prev_Id) | |
2203 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
2204 | or else Comes_From_Source (Prev_Id)) | |
2205 | then | |
fbf5a39b | 2206 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 RK |
2207 | Spec_Id := Prev_Id; |
2208 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2209 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2210 | ||
2211 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
2212 | |
2213 | if Nkind (N) = N_Subprogram_Body then | |
2214 | HSS := Handled_Statement_Sequence (N); | |
2215 | Check_Missing_Return; | |
2216 | end if; | |
2217 | ||
996ae0b0 RK |
2218 | return; |
2219 | ||
2220 | else | |
82c80734 RD |
2221 | -- Previous entity conflicts with subprogram name. Attempting to |
2222 | -- enter name will post error. | |
996ae0b0 RK |
2223 | |
2224 | Enter_Name (Body_Id); | |
2225 | return; | |
2226 | end if; | |
2227 | ||
82c80734 RD |
2228 | -- Non-generic case, find the subprogram declaration, if one was seen, |
2229 | -- or enter new overloaded entity in the current scope. If the | |
2230 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
2231 | -- part of the context of one of its subunits. No need to redo the | |
2232 | -- analysis. | |
996ae0b0 RK |
2233 | |
2234 | elsif Prev_Id = Body_Id | |
2235 | and then Has_Completion (Body_Id) | |
2236 | then | |
2237 | return; | |
2238 | ||
2239 | else | |
fbf5a39b | 2240 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
2241 | |
2242 | if Nkind (N) = N_Subprogram_Body_Stub | |
2243 | or else No (Corresponding_Spec (N)) | |
2244 | then | |
d44202ba HK |
2245 | if Is_Private_Concurrent_Primitive (Body_Id) then |
2246 | Spec_Id := Disambiguate_Spec; | |
2247 | else | |
2248 | Spec_Id := Find_Corresponding_Spec (N); | |
2249 | end if; | |
996ae0b0 RK |
2250 | |
2251 | -- If this is a duplicate body, no point in analyzing it | |
2252 | ||
2253 | if Error_Posted (N) then | |
2254 | return; | |
2255 | end if; | |
2256 | ||
82c80734 RD |
2257 | -- A subprogram body should cause freezing of its own declaration, |
2258 | -- but if there was no previous explicit declaration, then the | |
2259 | -- subprogram will get frozen too late (there may be code within | |
2260 | -- the body that depends on the subprogram having been frozen, | |
2261 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 2262 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
2263 | -- Finally, if the return type is an anonymous access to protected |
2264 | -- subprogram, it must be frozen before the body because its | |
2265 | -- expansion has generated an equivalent type that is used when | |
2266 | -- elaborating the body. | |
996ae0b0 RK |
2267 | |
2268 | if No (Spec_Id) then | |
2269 | Freeze_Before (N, Body_Id); | |
2270 | ||
2271 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
2272 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
2273 | |
2274 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
2275 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 2276 | end if; |
a38ff9b1 | 2277 | |
996ae0b0 RK |
2278 | else |
2279 | Spec_Id := Corresponding_Spec (N); | |
2280 | end if; | |
2281 | end if; | |
2282 | ||
82c80734 RD |
2283 | -- Do not inline any subprogram that contains nested subprograms, since |
2284 | -- the backend inlining circuit seems to generate uninitialized | |
07fc65c4 | 2285 | -- references in this case. We know this happens in the case of front |
82c80734 RD |
2286 | -- end ZCX support, but it also appears it can happen in other cases as |
2287 | -- well. The backend often rejects attempts to inline in the case of | |
2288 | -- nested procedures anyway, so little if anything is lost by this. | |
2289 | -- Note that this is test is for the benefit of the back-end. There is | |
2290 | -- a separate test for front-end inlining that also rejects nested | |
2291 | -- subprograms. | |
07fc65c4 GB |
2292 | |
2293 | -- Do not do this test if errors have been detected, because in some | |
2294 | -- error cases, this code blows up, and we don't need it anyway if | |
2295 | -- there have been errors, since we won't get to the linker anyway. | |
2296 | ||
82c80734 RD |
2297 | if Comes_From_Source (Body_Id) |
2298 | and then Serious_Errors_Detected = 0 | |
2299 | then | |
07fc65c4 GB |
2300 | P_Ent := Body_Id; |
2301 | loop | |
2302 | P_Ent := Scope (P_Ent); | |
2303 | exit when No (P_Ent) or else P_Ent = Standard_Standard; | |
2304 | ||
fbf5a39b | 2305 | if Is_Subprogram (P_Ent) then |
07fc65c4 GB |
2306 | Set_Is_Inlined (P_Ent, False); |
2307 | ||
2308 | if Comes_From_Source (P_Ent) | |
07fc65c4 GB |
2309 | and then Has_Pragma_Inline (P_Ent) |
2310 | then | |
fbf5a39b AC |
2311 | Cannot_Inline |
2312 | ("cannot inline& (nested subprogram)?", | |
2313 | N, P_Ent); | |
07fc65c4 GB |
2314 | end if; |
2315 | end if; | |
2316 | end loop; | |
2317 | end if; | |
2318 | ||
e660dbf7 JM |
2319 | Check_Inline_Pragma (Spec_Id); |
2320 | ||
701b7fbb RD |
2321 | -- Deal with special case of a fully private operation in the body of |
2322 | -- the protected type. We must create a declaration for the subprogram, | |
2323 | -- in order to attach the protected subprogram that will be used in | |
2324 | -- internal calls. We exclude compiler generated bodies from the | |
2325 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 2326 | |
996ae0b0 RK |
2327 | if No (Spec_Id) |
2328 | and then Comes_From_Source (N) | |
2329 | and then Is_Protected_Type (Current_Scope) | |
2330 | then | |
47bfea3a | 2331 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 2332 | end if; |
996ae0b0 | 2333 | |
5334d18f | 2334 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 2335 | |
701b7fbb | 2336 | if Present (Spec_Id) then |
996ae0b0 | 2337 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 2338 | Verify_Overriding_Indicator; |
5d37ba92 ES |
2339 | |
2340 | -- In general, the spec will be frozen when we start analyzing the | |
2341 | -- body. However, for internally generated operations, such as | |
2342 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
2343 | -- results, the spec may not have been frozen by the time we expand |
2344 | -- the freeze actions that include the bodies. In particular, extra | |
2345 | -- formals for accessibility or for return-in-place may need to be | |
2346 | -- generated. Freeze nodes, if any, are inserted before the current | |
2347 | -- body. These freeze actions are also needed in ASIS mode to enable | |
2348 | -- the proper back-annotations. | |
5d37ba92 ES |
2349 | |
2350 | if not Is_Frozen (Spec_Id) | |
7134062a | 2351 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
2352 | then |
2353 | -- Force the generation of its freezing node to ensure proper | |
2354 | -- management of access types in the backend. | |
2355 | ||
2356 | -- This is definitely needed for some cases, but it is not clear | |
2357 | -- why, to be investigated further??? | |
2358 | ||
2359 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 2360 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 2361 | end if; |
996ae0b0 RK |
2362 | end if; |
2363 | ||
a5d83d61 AC |
2364 | -- Mark presence of postcondition procedure in current scope and mark |
2365 | -- the procedure itself as needing debug info. The latter is important | |
2366 | -- when analyzing decision coverage (for example, for MC/DC coverage). | |
7ca78bba | 2367 | |
0dabde3a ES |
2368 | if Chars (Body_Id) = Name_uPostconditions then |
2369 | Set_Has_Postconditions (Current_Scope); | |
a5d83d61 | 2370 | Set_Debug_Info_Needed (Body_Id); |
0dabde3a ES |
2371 | end if; |
2372 | ||
996ae0b0 RK |
2373 | -- Place subprogram on scope stack, and make formals visible. If there |
2374 | -- is a spec, the visible entity remains that of the spec. | |
2375 | ||
2376 | if Present (Spec_Id) then | |
07fc65c4 | 2377 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
2378 | |
2379 | if Is_Child_Unit (Spec_Id) then | |
2380 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
2381 | end if; | |
2382 | ||
fbf5a39b AC |
2383 | if Style_Check then |
2384 | Style.Check_Identifier (Body_Id, Spec_Id); | |
2385 | end if; | |
996ae0b0 RK |
2386 | |
2387 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2388 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2389 | ||
f937473f | 2390 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 2391 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
996ae0b0 | 2392 | return; |
21d27997 | 2393 | |
996ae0b0 RK |
2394 | else |
2395 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
2396 | Set_Has_Completion (Spec_Id); | |
2397 | ||
2398 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 2399 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
2400 | end if; |
2401 | ||
2402 | -- If this is a body generated for a renaming, do not check for | |
2403 | -- full conformance. The check is redundant, because the spec of | |
2404 | -- the body is a copy of the spec in the renaming declaration, | |
2405 | -- and the test can lead to spurious errors on nested defaults. | |
2406 | ||
2407 | if Present (Spec_Decl) | |
996ae0b0 | 2408 | and then not Comes_From_Source (N) |
93a81b02 GB |
2409 | and then |
2410 | (Nkind (Original_Node (Spec_Decl)) = | |
d2f97d3e GB |
2411 | N_Subprogram_Renaming_Declaration |
2412 | or else (Present (Corresponding_Body (Spec_Decl)) | |
2413 | and then | |
2414 | Nkind (Unit_Declaration_Node | |
2415 | (Corresponding_Body (Spec_Decl))) = | |
2416 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
2417 | then |
2418 | Conformant := True; | |
cabe9abc AC |
2419 | |
2420 | -- Conversely, the spec may have been generated for specless body | |
2421 | -- with an inline pragma. | |
2422 | ||
2423 | elsif Comes_From_Source (N) | |
2424 | and then not Comes_From_Source (Spec_Id) | |
2425 | and then Has_Pragma_Inline (Spec_Id) | |
2426 | then | |
2427 | Conformant := True; | |
76a69663 | 2428 | |
996ae0b0 RK |
2429 | else |
2430 | Check_Conformance | |
2431 | (Body_Id, Spec_Id, | |
76a69663 | 2432 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
2433 | end if; |
2434 | ||
2435 | -- If the body is not fully conformant, we have to decide if we | |
2436 | -- should analyze it or not. If it has a really messed up profile | |
2437 | -- then we probably should not analyze it, since we will get too | |
2438 | -- many bogus messages. | |
2439 | ||
2440 | -- Our decision is to go ahead in the non-fully conformant case | |
2441 | -- only if it is at least mode conformant with the spec. Note | |
2442 | -- that the call to Check_Fully_Conformant has issued the proper | |
2443 | -- error messages to complain about the lack of conformance. | |
2444 | ||
2445 | if not Conformant | |
2446 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
2447 | then | |
2448 | return; | |
2449 | end if; | |
2450 | end if; | |
2451 | ||
996ae0b0 | 2452 | if Spec_Id /= Body_Id then |
fbf5a39b | 2453 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
2454 | end if; |
2455 | ||
2456 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
2457 | Set_Corresponding_Spec (N, Spec_Id); | |
758c442c | 2458 | |
5d37ba92 ES |
2459 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
2460 | -- of a concurrent type, the type of the first parameter has been | |
2461 | -- replaced with the corresponding record, which is the proper | |
2462 | -- run-time structure to use. However, within the body there may | |
2463 | -- be uses of the formals that depend on primitive operations | |
2464 | -- of the type (in particular calls in prefixed form) for which | |
2465 | -- we need the original concurrent type. The operation may have | |
2466 | -- several controlling formals, so the replacement must be done | |
2467 | -- for all of them. | |
758c442c GD |
2468 | |
2469 | if Comes_From_Source (Spec_Id) | |
2470 | and then Present (First_Entity (Spec_Id)) | |
2471 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
2472 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
5d37ba92 | 2473 | and then |
ce2b6ba5 | 2474 | Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
5d37ba92 ES |
2475 | and then |
2476 | Present | |
21d27997 RD |
2477 | (Corresponding_Concurrent_Type |
2478 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 2479 | then |
5d37ba92 ES |
2480 | declare |
2481 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
2482 | Form : Entity_Id; | |
2483 | ||
2484 | begin | |
2485 | Form := First_Formal (Spec_Id); | |
2486 | while Present (Form) loop | |
2487 | if Etype (Form) = Typ then | |
2488 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
2489 | end if; | |
2490 | ||
2491 | Next_Formal (Form); | |
2492 | end loop; | |
2493 | end; | |
758c442c GD |
2494 | end if; |
2495 | ||
21d27997 RD |
2496 | -- Make the formals visible, and place subprogram on scope stack. |
2497 | -- This is also the point at which we set Last_Real_Spec_Entity | |
2498 | -- to mark the entities which will not be moved to the body. | |
758c442c | 2499 | |
996ae0b0 | 2500 | Install_Formals (Spec_Id); |
21d27997 | 2501 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
0a36105d | 2502 | Push_Scope (Spec_Id); |
996ae0b0 RK |
2503 | |
2504 | -- Make sure that the subprogram is immediately visible. For | |
2505 | -- child units that have no separate spec this is indispensable. | |
2506 | -- Otherwise it is safe albeit redundant. | |
2507 | ||
2508 | Set_Is_Immediately_Visible (Spec_Id); | |
2509 | end if; | |
2510 | ||
2511 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
2512 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
2513 | Set_Scope (Body_Id, Scope (Spec_Id)); | |
ec4867fa | 2514 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
996ae0b0 RK |
2515 | |
2516 | -- Case of subprogram body with no previous spec | |
2517 | ||
2518 | else | |
3e5daac4 AC |
2519 | -- Check for style warning required |
2520 | ||
996ae0b0 | 2521 | if Style_Check |
3e5daac4 AC |
2522 | |
2523 | -- Only apply check for source level subprograms for which checks | |
2524 | -- have not been suppressed. | |
2525 | ||
996ae0b0 RK |
2526 | and then Comes_From_Source (Body_Id) |
2527 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
2528 | |
2529 | -- No warnings within an instance | |
2530 | ||
996ae0b0 | 2531 | and then not In_Instance |
3e5daac4 | 2532 | |
b0186f71 | 2533 | -- No warnings for expression functions |
3e5daac4 | 2534 | |
b0186f71 | 2535 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
2536 | then |
2537 | Style.Body_With_No_Spec (N); | |
2538 | end if; | |
2539 | ||
2540 | New_Overloaded_Entity (Body_Id); | |
2541 | ||
2542 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
2543 | Set_Acts_As_Spec (N); | |
2544 | Generate_Definition (Body_Id); | |
dac3bede | 2545 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
fbf5a39b AC |
2546 | Generate_Reference |
2547 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
2548 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 | 2549 | Install_Formals (Body_Id); |
0a36105d | 2550 | Push_Scope (Body_Id); |
996ae0b0 RK |
2551 | end if; |
2552 | end if; | |
2553 | ||
76a69663 ES |
2554 | -- If the return type is an anonymous access type whose designated type |
2555 | -- is the limited view of a class-wide type and the non-limited view is | |
2556 | -- available, update the return type accordingly. | |
ec4867fa | 2557 | |
0791fbe9 | 2558 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
2559 | and then Comes_From_Source (N) |
2560 | then | |
2561 | declare | |
ec4867fa | 2562 | Etyp : Entity_Id; |
0a36105d | 2563 | Rtyp : Entity_Id; |
ec4867fa ES |
2564 | |
2565 | begin | |
0a36105d JM |
2566 | Rtyp := Etype (Current_Scope); |
2567 | ||
2568 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
2569 | Etyp := Directly_Designated_Type (Rtyp); | |
2570 | ||
2571 | if Is_Class_Wide_Type (Etyp) | |
2572 | and then From_With_Type (Etyp) | |
2573 | then | |
2574 | Set_Directly_Designated_Type | |
2575 | (Etype (Current_Scope), Available_View (Etyp)); | |
2576 | end if; | |
2577 | end if; | |
ec4867fa ES |
2578 | end; |
2579 | end if; | |
2580 | ||
996ae0b0 RK |
2581 | -- If this is the proper body of a stub, we must verify that the stub |
2582 | -- conforms to the body, and to the previous spec if one was present. | |
2583 | -- we know already that the body conforms to that spec. This test is | |
2584 | -- only required for subprograms that come from source. | |
2585 | ||
2586 | if Nkind (Parent (N)) = N_Subunit | |
2587 | and then Comes_From_Source (N) | |
2588 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
2589 | and then Nkind (Corresponding_Stub (Parent (N))) = |
2590 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
2591 | then |
2592 | declare | |
fbf5a39b AC |
2593 | Old_Id : constant Entity_Id := |
2594 | Defining_Entity | |
2595 | (Specification (Corresponding_Stub (Parent (N)))); | |
2596 | ||
996ae0b0 | 2597 | Conformant : Boolean := False; |
996ae0b0 RK |
2598 | |
2599 | begin | |
2600 | if No (Spec_Id) then | |
2601 | Check_Fully_Conformant (Body_Id, Old_Id); | |
2602 | ||
2603 | else | |
2604 | Check_Conformance | |
2605 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
2606 | ||
2607 | if not Conformant then | |
2608 | ||
2609 | -- The stub was taken to be a new declaration. Indicate | |
2610 | -- that it lacks a body. | |
2611 | ||
2612 | Set_Has_Completion (Old_Id, False); | |
2613 | end if; | |
2614 | end if; | |
2615 | end; | |
2616 | end if; | |
2617 | ||
2618 | Set_Has_Completion (Body_Id); | |
2619 | Check_Eliminated (Body_Id); | |
2620 | ||
2621 | if Nkind (N) = N_Subprogram_Body_Stub then | |
2622 | return; | |
2623 | ||
ec4867fa | 2624 | elsif Present (Spec_Id) |
996ae0b0 | 2625 | and then Expander_Active |
e660dbf7 | 2626 | and then |
800621e0 | 2627 | (Has_Pragma_Inline_Always (Spec_Id) |
e660dbf7 | 2628 | or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining)) |
996ae0b0 | 2629 | then |
e660dbf7 | 2630 | Build_Body_To_Inline (N, Spec_Id); |
996ae0b0 RK |
2631 | end if; |
2632 | ||
0ab80019 | 2633 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
9bc856dd | 2634 | -- if its specification we have to install the private withed units. |
21d27997 | 2635 | -- This holds for child units as well. |
9bc856dd AC |
2636 | |
2637 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 2638 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
2639 | then |
2640 | Install_Private_With_Clauses (Body_Id); | |
2641 | end if; | |
2642 | ||
ec4867fa ES |
2643 | Check_Anonymous_Return; |
2644 | ||
fdce4bb7 JM |
2645 | -- Set the Protected_Formal field of each extra formal of the protected |
2646 | -- subprogram to reference the corresponding extra formal of the | |
2647 | -- subprogram that implements it. For regular formals this occurs when | |
2648 | -- the protected subprogram's declaration is expanded, but the extra | |
2649 | -- formals don't get created until the subprogram is frozen. We need to | |
2650 | -- do this before analyzing the protected subprogram's body so that any | |
2651 | -- references to the original subprogram's extra formals will be changed | |
2652 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
2653 | ||
2654 | if Present (Spec_Id) | |
2655 | and then Is_Protected_Type (Scope (Spec_Id)) | |
2656 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
2657 | then | |
2658 | declare | |
2659 | Impl_Subp : constant Entity_Id := | |
2660 | Protected_Body_Subprogram (Spec_Id); | |
2661 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
2662 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
2663 | begin |
2664 | while Present (Prot_Ext_Formal) loop | |
2665 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 2666 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
2667 | Next_Formal_With_Extras (Prot_Ext_Formal); |
2668 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
2669 | end loop; | |
2670 | end; | |
2671 | end if; | |
2672 | ||
0868e09c | 2673 | -- Now we can go on to analyze the body |
996ae0b0 RK |
2674 | |
2675 | HSS := Handled_Statement_Sequence (N); | |
2676 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 2677 | |
483361a6 AC |
2678 | -- Deal with preconditions and postconditions. In formal verification |
2679 | -- mode, we keep pre- and postconditions attached to entities rather | |
2680 | -- than inserted in the code, in order to facilitate a distinct | |
2681 | -- treatment for them. | |
21d27997 | 2682 | |
483361a6 AC |
2683 | if not ALFA_Mode then |
2684 | Process_PPCs (N, Spec_Id, Body_Id); | |
2685 | end if; | |
21d27997 | 2686 | |
f3d0f304 | 2687 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
2688 | -- for discriminals and privals and finally a declaration for the entry |
2689 | -- family index (if applicable). This form of early expansion is done | |
2690 | -- when the Expander is active because Install_Private_Data_Declarations | |
2691 | -- references entities which were created during regular expansion. | |
2692 | ||
2693 | if Expander_Active | |
2694 | and then Comes_From_Source (N) | |
2695 | and then Present (Prot_Typ) | |
2696 | and then Present (Spec_Id) | |
2697 | and then not Is_Eliminated (Spec_Id) | |
2698 | then | |
2699 | Install_Private_Data_Declarations | |
2700 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
2701 | end if; | |
2702 | ||
2703 | -- Analyze the declarations (this call will analyze the precondition | |
2704 | -- Check pragmas we prepended to the list, as well as the declaration | |
2705 | -- of the _Postconditions procedure). | |
2706 | ||
996ae0b0 | 2707 | Analyze_Declarations (Declarations (N)); |
21d27997 RD |
2708 | |
2709 | -- Check completion, and analyze the statements | |
2710 | ||
996ae0b0 | 2711 | Check_Completion; |
33931112 | 2712 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 2713 | Analyze (HSS); |
21d27997 RD |
2714 | |
2715 | -- Deal with end of scope processing for the body | |
2716 | ||
07fc65c4 | 2717 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
2718 | End_Scope; |
2719 | Check_Subprogram_Order (N); | |
c37bb106 | 2720 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
2721 | |
2722 | -- If we have a separate spec, then the analysis of the declarations | |
2723 | -- caused the entities in the body to be chained to the spec id, but | |
2724 | -- we want them chained to the body id. Only the formal parameters | |
2725 | -- end up chained to the spec id in this case. | |
2726 | ||
2727 | if Present (Spec_Id) then | |
2728 | ||
d39d6bb8 | 2729 | -- We must conform to the categorization of our spec |
996ae0b0 | 2730 | |
d39d6bb8 | 2731 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 2732 | |
d39d6bb8 RD |
2733 | -- And if this is a child unit, the parent units must conform |
2734 | ||
2735 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
2736 | Validate_Categorization_Dependency |
2737 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
2738 | end if; | |
2739 | ||
21d27997 RD |
2740 | -- Here is where we move entities from the spec to the body |
2741 | ||
2742 | -- Case where there are entities that stay with the spec | |
2743 | ||
2744 | if Present (Last_Real_Spec_Entity) then | |
2745 | ||
2746 | -- No body entities (happens when the only real spec entities | |
2747 | -- come from precondition and postcondition pragmas) | |
2748 | ||
2749 | if No (Last_Entity (Body_Id)) then | |
2750 | Set_First_Entity | |
2751 | (Body_Id, Next_Entity (Last_Real_Spec_Entity)); | |
2752 | ||
2753 | -- Body entities present (formals), so chain stuff past them | |
2754 | ||
2755 | else | |
2756 | Set_Next_Entity | |
2757 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
2758 | end if; | |
2759 | ||
2760 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 2761 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
2762 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
2763 | ||
2764 | -- Case where there are no spec entities, in this case there can | |
2765 | -- be no body entities either, so just move everything. | |
996ae0b0 RK |
2766 | |
2767 | else | |
21d27997 | 2768 | pragma Assert (No (Last_Entity (Body_Id))); |
996ae0b0 RK |
2769 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
2770 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
2771 | Set_First_Entity (Spec_Id, Empty); | |
2772 | Set_Last_Entity (Spec_Id, Empty); | |
2773 | end if; | |
2774 | end if; | |
2775 | ||
7665e4bd | 2776 | Check_Missing_Return; |
996ae0b0 | 2777 | |
82c80734 | 2778 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
2779 | -- the body of the procedure. But first we deal with a special case |
2780 | -- where we want to modify this check. If the body of the subprogram | |
2781 | -- starts with a raise statement or its equivalent, or if the body | |
2782 | -- consists entirely of a null statement, then it is pretty obvious | |
2783 | -- that it is OK to not reference the parameters. For example, this | |
2784 | -- might be the following common idiom for a stubbed function: | |
82c80734 RD |
2785 | -- statement of the procedure raises an exception. In particular this |
2786 | -- deals with the common idiom of a stubbed function, which might | |
2787 | -- appear as something like | |
fbf5a39b AC |
2788 | |
2789 | -- function F (A : Integer) return Some_Type; | |
2790 | -- X : Some_Type; | |
2791 | -- begin | |
2792 | -- raise Program_Error; | |
2793 | -- return X; | |
2794 | -- end F; | |
2795 | ||
76a69663 ES |
2796 | -- Here the purpose of X is simply to satisfy the annoying requirement |
2797 | -- in Ada that there be at least one return, and we certainly do not | |
2798 | -- want to go posting warnings on X that it is not initialized! On | |
2799 | -- the other hand, if X is entirely unreferenced that should still | |
2800 | -- get a warning. | |
2801 | ||
2802 | -- What we do is to detect these cases, and if we find them, flag the | |
2803 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
2804 | -- suppress unwanted warnings. For the case of the function stub above | |
2805 | -- we have a special test to set X as apparently assigned to suppress | |
2806 | -- the warning. | |
996ae0b0 RK |
2807 | |
2808 | declare | |
800621e0 | 2809 | Stm : Node_Id; |
996ae0b0 RK |
2810 | |
2811 | begin | |
0a36105d JM |
2812 | -- Skip initial labels (for one thing this occurs when we are in |
2813 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
2814 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 2815 | |
800621e0 | 2816 | Stm := First (Statements (HSS)); |
0a36105d JM |
2817 | while Nkind (Stm) = N_Label |
2818 | or else Nkind (Stm) in N_Push_xxx_Label | |
2819 | loop | |
996ae0b0 | 2820 | Next (Stm); |
0a36105d | 2821 | end loop; |
996ae0b0 | 2822 | |
fbf5a39b AC |
2823 | -- Do the test on the original statement before expansion |
2824 | ||
2825 | declare | |
2826 | Ostm : constant Node_Id := Original_Node (Stm); | |
2827 | ||
2828 | begin | |
76a69663 | 2829 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
2830 | |
2831 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
2832 | Set_Trivial_Subprogram (Stm); |
2833 | ||
f3d57416 | 2834 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
2835 | |
2836 | elsif Nkind (Stm) = N_Null_Statement | |
2837 | and then Comes_From_Source (Stm) | |
2838 | and then No (Next (Stm)) | |
2839 | then | |
2840 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
2841 | |
2842 | -- Check for explicit call cases which likely raise an exception | |
2843 | ||
2844 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
2845 | if Is_Entity_Name (Name (Ostm)) then | |
2846 | declare | |
2847 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
2848 | ||
2849 | begin | |
2850 | -- If the procedure is marked No_Return, then likely it | |
2851 | -- raises an exception, but in any case it is not coming | |
76a69663 | 2852 | -- back here, so turn on the flag. |
fbf5a39b | 2853 | |
f46faa08 AC |
2854 | if Present (Ent) |
2855 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
2856 | and then No_Return (Ent) |
2857 | then | |
76a69663 | 2858 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
2859 | end if; |
2860 | end; | |
2861 | end if; | |
2862 | end if; | |
2863 | end; | |
996ae0b0 RK |
2864 | end; |
2865 | ||
2866 | -- Check for variables that are never modified | |
2867 | ||
2868 | declare | |
2869 | E1, E2 : Entity_Id; | |
2870 | ||
2871 | begin | |
fbf5a39b | 2872 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
2873 | -- flags from out parameters to the corresponding entities in the |
2874 | -- body. The reason we do that is we want to post error flags on | |
2875 | -- the body entities, not the spec entities. | |
2876 | ||
2877 | if Present (Spec_Id) then | |
2878 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
2879 | while Present (E1) loop |
2880 | if Ekind (E1) = E_Out_Parameter then | |
2881 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 2882 | while Present (E2) loop |
996ae0b0 RK |
2883 | exit when Chars (E1) = Chars (E2); |
2884 | Next_Entity (E2); | |
2885 | end loop; | |
2886 | ||
fbf5a39b AC |
2887 | if Present (E2) then |
2888 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
2889 | end if; | |
996ae0b0 RK |
2890 | end if; |
2891 | ||
2892 | Next_Entity (E1); | |
2893 | end loop; | |
2894 | end if; | |
2895 | ||
0868e09c RD |
2896 | -- Check references in body unless it was deleted. Note that the |
2897 | -- check of Body_Deleted here is not just for efficiency, it is | |
2898 | -- necessary to avoid junk warnings on formal parameters. | |
2899 | ||
2900 | if not Body_Deleted then | |
2901 | Check_References (Body_Id); | |
2902 | end if; | |
996ae0b0 | 2903 | end; |
b1b543d2 | 2904 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 RK |
2905 | |
2906 | ------------------------------------ | |
2907 | -- Analyze_Subprogram_Declaration -- | |
2908 | ------------------------------------ | |
2909 | ||
2910 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
5d5832bc | 2911 | Loc : constant Source_Ptr := Sloc (N); |
0f1a6a0b | 2912 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc AC |
2913 | Designator : Entity_Id; |
2914 | Form : Node_Id; | |
5d5832bc | 2915 | Null_Body : Node_Id := Empty; |
996ae0b0 RK |
2916 | |
2917 | -- Start of processing for Analyze_Subprogram_Declaration | |
2918 | ||
2919 | begin | |
2ba431e5 | 2920 | -- Null procedures are not allowed in SPARK |
daec8eeb | 2921 | |
fe5d3068 | 2922 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
2923 | and then Null_Present (Specification (N)) |
2924 | then | |
2ba431e5 | 2925 | Check_SPARK_Restriction ("null procedure is not allowed", N); |
daec8eeb YM |
2926 | end if; |
2927 | ||
349ff68f | 2928 | -- For a null procedure, capture the profile before analysis, for |
c159409f AC |
2929 | -- expansion at the freeze point and at each point of call. The body |
2930 | -- will only be used if the procedure has preconditions. In that case | |
2931 | -- the body is analyzed at the freeze point. | |
5d5832bc AC |
2932 | |
2933 | if Nkind (Specification (N)) = N_Procedure_Specification | |
2934 | and then Null_Present (Specification (N)) | |
2935 | and then Expander_Active | |
2936 | then | |
2937 | Null_Body := | |
2938 | Make_Subprogram_Body (Loc, | |
2939 | Specification => | |
2940 | New_Copy_Tree (Specification (N)), | |
349ff68f AC |
2941 | Declarations => |
2942 | New_List, | |
5d5832bc AC |
2943 | Handled_Statement_Sequence => |
2944 | Make_Handled_Sequence_Of_Statements (Loc, | |
2945 | Statements => New_List (Make_Null_Statement (Loc)))); | |
2946 | ||
01957849 | 2947 | -- Create new entities for body and formals |
5d5832bc AC |
2948 | |
2949 | Set_Defining_Unit_Name (Specification (Null_Body), | |
2950 | Make_Defining_Identifier (Loc, Chars (Defining_Entity (N)))); | |
2951 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
2952 | ||
2953 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
2954 | while Present (Form) loop | |
2955 | Set_Defining_Identifier (Form, | |
2956 | Make_Defining_Identifier (Loc, | |
2957 | Chars (Defining_Identifier (Form)))); | |
718deaf1 AC |
2958 | |
2959 | -- Resolve the types of the formals now, because the freeze point | |
2960 | -- may appear in a different context, e.g. an instantiation. | |
2961 | ||
2962 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
2963 | Find_Type (Parameter_Type (Form)); | |
2964 | ||
2965 | elsif | |
2966 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
2967 | then | |
2968 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
2969 | ||
2970 | else | |
2971 | ||
2972 | -- the case of a null procedure with a formal that is an | |
2973 | -- access_to_subprogram type, and that is used as an actual | |
2974 | -- in an instantiation is left to the enthusiastic reader. | |
2975 | ||
2976 | null; | |
2977 | end if; | |
2978 | ||
5d5832bc AC |
2979 | Next (Form); |
2980 | end loop; | |
2981 | ||
2982 | if Is_Protected_Type (Current_Scope) then | |
ed2233dc | 2983 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
5d5832bc AC |
2984 | end if; |
2985 | end if; | |
2986 | ||
beacce02 | 2987 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
5d5832bc | 2988 | Generate_Definition (Designator); |
dac3bede | 2989 | -- ??? why this call, already in Analyze_Subprogram_Specification |
5d5832bc | 2990 | |
b1b543d2 BD |
2991 | if Debug_Flag_C then |
2992 | Write_Str ("==> subprogram spec "); | |
2993 | Write_Name (Chars (Designator)); | |
2994 | Write_Str (" from "); | |
2995 | Write_Location (Sloc (N)); | |
2996 | Write_Eol; | |
2997 | Indent; | |
2998 | end if; | |
2999 | ||
5d5832bc AC |
3000 | if Nkind (Specification (N)) = N_Procedure_Specification |
3001 | and then Null_Present (Specification (N)) | |
3002 | then | |
3003 | Set_Has_Completion (Designator); | |
996ae0b0 | 3004 | |
5d5832bc AC |
3005 | if Present (Null_Body) then |
3006 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
3007 | Set_Body_To_Inline (N, Null_Body); | |
3008 | Set_Is_Inlined (Designator); | |
3009 | end if; | |
3010 | end if; | |
996ae0b0 RK |
3011 | |
3012 | Validate_RCI_Subprogram_Declaration (N); | |
996ae0b0 RK |
3013 | New_Overloaded_Entity (Designator); |
3014 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 3015 | |
6ca063eb AC |
3016 | -- If the type of the first formal of the current subprogram is a |
3017 | -- nongeneric tagged private type, mark the subprogram as being a | |
3018 | -- private primitive. Ditto if this is a function with controlling | |
b7d5e87b AC |
3019 | -- result, and the return type is currently private. In both cases, |
3020 | -- the type of the controlling argument or result must be in the | |
3021 | -- current scope for the operation to be primitive. | |
6ca063eb AC |
3022 | |
3023 | if Has_Controlling_Result (Designator) | |
3024 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 3025 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
3026 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
3027 | then | |
3028 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 3029 | |
6ca063eb | 3030 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
3031 | declare |
3032 | Formal_Typ : constant Entity_Id := | |
3033 | Etype (First_Formal (Designator)); | |
3034 | begin | |
3035 | Set_Is_Private_Primitive (Designator, | |
3036 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 3037 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
3038 | and then Is_Private_Type (Formal_Typ) |
3039 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
3040 | end; | |
3041 | end if; | |
3042 | ||
ec4867fa ES |
3043 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
3044 | -- or null. | |
3045 | ||
0791fbe9 | 3046 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
3047 | and then Comes_From_Source (N) |
3048 | and then Is_Dispatching_Operation (Designator) | |
3049 | then | |
3050 | declare | |
3051 | E : Entity_Id; | |
3052 | Etyp : Entity_Id; | |
3053 | ||
3054 | begin | |
3055 | if Has_Controlling_Result (Designator) then | |
3056 | Etyp := Etype (Designator); | |
3057 | ||
3058 | else | |
3059 | E := First_Entity (Designator); | |
3060 | while Present (E) | |
3061 | and then Is_Formal (E) | |
3062 | and then not Is_Controlling_Formal (E) | |
3063 | loop | |
3064 | Next_Entity (E); | |
3065 | end loop; | |
3066 | ||
3067 | Etyp := Etype (E); | |
3068 | end if; | |
3069 | ||
3070 | if Is_Access_Type (Etyp) then | |
3071 | Etyp := Directly_Designated_Type (Etyp); | |
3072 | end if; | |
3073 | ||
3074 | if Is_Interface (Etyp) | |
f937473f | 3075 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa ES |
3076 | and then not (Ekind (Designator) = E_Procedure |
3077 | and then Null_Present (Specification (N))) | |
3078 | then | |
3079 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
ed2233dc | 3080 | Error_Msg_N |
ec4867fa ES |
3081 | ("(Ada 2005) interface subprogram % must be abstract or null", |
3082 | N); | |
3083 | end if; | |
3084 | end; | |
3085 | end if; | |
3086 | ||
fbf5a39b AC |
3087 | -- What is the following code for, it used to be |
3088 | ||
3089 | -- ??? Set_Suppress_Elaboration_Checks | |
3090 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
3091 | ||
3092 | -- The following seems equivalent, but a bit dubious | |
3093 | ||
3094 | if Elaboration_Checks_Suppressed (Designator) then | |
3095 | Set_Kill_Elaboration_Checks (Designator); | |
3096 | end if; | |
996ae0b0 RK |
3097 | |
3098 | if Scop /= Standard_Standard | |
3099 | and then not Is_Child_Unit (Designator) | |
3100 | then | |
fbf5a39b | 3101 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 | 3102 | else |
e895b435 | 3103 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 3104 | |
0a36105d | 3105 | Push_Scope (Designator); |
996ae0b0 RK |
3106 | Set_Categorization_From_Pragmas (N); |
3107 | Validate_Categorization_Dependency (N, Designator); | |
3108 | Pop_Scope; | |
3109 | end if; | |
3110 | ||
3111 | -- For a compilation unit, set body required. This flag will only be | |
3112 | -- reset if a valid Import or Interface pragma is processed later on. | |
3113 | ||
3114 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
3115 | Set_Body_Required (Parent (N), True); | |
758c442c | 3116 | |
0791fbe9 | 3117 | if Ada_Version >= Ada_2005 |
758c442c GD |
3118 | and then Nkind (Specification (N)) = N_Procedure_Specification |
3119 | and then Null_Present (Specification (N)) | |
3120 | then | |
3121 | Error_Msg_N | |
3122 | ("null procedure cannot be declared at library level", N); | |
3123 | end if; | |
996ae0b0 RK |
3124 | end if; |
3125 | ||
fbf5a39b | 3126 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 3127 | Check_Eliminated (Designator); |
fbf5a39b | 3128 | |
b1b543d2 BD |
3129 | if Debug_Flag_C then |
3130 | Outdent; | |
3131 | Write_Str ("<== subprogram spec "); | |
3132 | Write_Name (Chars (Designator)); | |
3133 | Write_Str (" from "); | |
3134 | Write_Location (Sloc (N)); | |
3135 | Write_Eol; | |
3136 | end if; | |
0f1a6a0b | 3137 | |
1a265e78 AC |
3138 | if Is_Protected_Type (Current_Scope) then |
3139 | ||
3140 | -- Indicate that this is a protected operation, because it may be | |
3141 | -- used in subsequent declarations within the protected type. | |
3142 | ||
3143 | Set_Convention (Designator, Convention_Protected); | |
3144 | end if; | |
3145 | ||
beacce02 | 3146 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
3147 | |
3148 | if Has_Aspects (N) then | |
3149 | Analyze_Aspect_Specifications (N, Designator); | |
3150 | end if; | |
996ae0b0 RK |
3151 | end Analyze_Subprogram_Declaration; |
3152 | ||
fbf5a39b AC |
3153 | -------------------------------------- |
3154 | -- Analyze_Subprogram_Specification -- | |
3155 | -------------------------------------- | |
3156 | ||
3157 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
3158 | -- declaration). This procedure is called to analyze the specification in | |
3159 | -- both subprogram bodies and subprogram declarations (specs). | |
3160 | ||
3161 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
3162 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 3163 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 3164 | |
758c442c GD |
3165 | -- Start of processing for Analyze_Subprogram_Specification |
3166 | ||
fbf5a39b | 3167 | begin |
2ba431e5 | 3168 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 3169 | |
db72f10a AC |
3170 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
3171 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
3172 | then | |
2ba431e5 | 3173 | Check_SPARK_Restriction ("user-defined operator is not allowed", N); |
38171f43 AC |
3174 | end if; |
3175 | ||
3176 | -- Proceed with analysis | |
3177 | ||
fbf5a39b | 3178 | Generate_Definition (Designator); |
dac3bede | 3179 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
fbf5a39b AC |
3180 | |
3181 | if Nkind (N) = N_Function_Specification then | |
3182 | Set_Ekind (Designator, E_Function); | |
3183 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
3184 | else |
3185 | Set_Ekind (Designator, E_Procedure); | |
3186 | Set_Etype (Designator, Standard_Void_Type); | |
3187 | end if; | |
3188 | ||
800621e0 | 3189 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
3190 | |
3191 | Set_Scope (Designator, Current_Scope); | |
3192 | ||
fbf5a39b | 3193 | if Present (Formals) then |
0a36105d | 3194 | Push_Scope (Designator); |
fbf5a39b | 3195 | Process_Formals (Formals, N); |
758c442c | 3196 | |
a38ff9b1 ES |
3197 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
3198 | -- inherited interface operation, and the controlling type is | |
3199 | -- a synchronized type, replace the type with its corresponding | |
3200 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
3201 | -- Same processing for an access parameter whose designated type is |
3202 | -- derived from a synchronized interface. | |
758c442c | 3203 | |
0791fbe9 | 3204 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
3205 | declare |
3206 | Formal : Entity_Id; | |
3207 | Formal_Typ : Entity_Id; | |
3208 | Rec_Typ : Entity_Id; | |
69cb258c | 3209 | Desig_Typ : Entity_Id; |
0a36105d | 3210 | |
d44202ba HK |
3211 | begin |
3212 | Formal := First_Formal (Designator); | |
3213 | while Present (Formal) loop | |
3214 | Formal_Typ := Etype (Formal); | |
0a36105d | 3215 | |
d44202ba HK |
3216 | if Is_Concurrent_Type (Formal_Typ) |
3217 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
3218 | then | |
3219 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
3220 | ||
3221 | if Present (Interfaces (Rec_Typ)) then | |
3222 | Set_Etype (Formal, Rec_Typ); | |
3223 | end if; | |
69cb258c AC |
3224 | |
3225 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
3226 | Desig_Typ := Designated_Type (Formal_Typ); | |
3227 | ||
3228 | if Is_Concurrent_Type (Desig_Typ) | |
3229 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
3230 | then | |
3231 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
3232 | ||
3233 | if Present (Interfaces (Rec_Typ)) then | |
3234 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
3235 | end if; | |
3236 | end if; | |
d44202ba HK |
3237 | end if; |
3238 | ||
3239 | Next_Formal (Formal); | |
3240 | end loop; | |
3241 | end; | |
758c442c GD |
3242 | end if; |
3243 | ||
fbf5a39b | 3244 | End_Scope; |
82c80734 | 3245 | |
b66c3ff4 AC |
3246 | -- The subprogram scope is pushed and popped around the processing of |
3247 | -- the return type for consistency with call above to Process_Formals | |
3248 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
3249 | -- itype created for the return type will be associated with the proper | |
3250 | -- scope. | |
3251 | ||
82c80734 | 3252 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 3253 | Push_Scope (Designator); |
82c80734 | 3254 | Analyze_Return_Type (N); |
b66c3ff4 | 3255 | End_Scope; |
fbf5a39b AC |
3256 | end if; |
3257 | ||
e606088a AC |
3258 | -- Function case |
3259 | ||
fbf5a39b | 3260 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
3261 | |
3262 | -- Deal with operator symbol case | |
3263 | ||
fbf5a39b AC |
3264 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
3265 | Valid_Operator_Definition (Designator); | |
3266 | end if; | |
3267 | ||
3268 | May_Need_Actuals (Designator); | |
3269 | ||
fe63b1b1 ES |
3270 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
3271 | -- the subprogram is abstract also. This does not apply to renaming | |
3272 | -- declarations, where abstractness is inherited. | |
2bfb1b72 | 3273 | |
fe63b1b1 ES |
3274 | -- In case of primitives associated with abstract interface types |
3275 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 3276 | |
2bfb1b72 RD |
3277 | if not Nkind_In (Parent (N), N_Subprogram_Renaming_Declaration, |
3278 | N_Abstract_Subprogram_Declaration, | |
3279 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 3280 | then |
2e79de51 AC |
3281 | if Is_Abstract_Type (Etype (Designator)) |
3282 | and then not Is_Interface (Etype (Designator)) | |
3283 | then | |
3284 | Error_Msg_N | |
3285 | ("function that returns abstract type must be abstract", N); | |
3286 | ||
e606088a | 3287 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
3288 | -- access result whose designated type is abstract. |
3289 | ||
3290 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
3291 | and then | |
3292 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
3293 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 3294 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
3295 | then |
3296 | Error_Msg_N ("function whose access result designates " | |
3297 | & "abstract type must be abstract", N); | |
3298 | end if; | |
fbf5a39b AC |
3299 | end if; |
3300 | end if; | |
3301 | ||
3302 | return Designator; | |
3303 | end Analyze_Subprogram_Specification; | |
3304 | ||
996ae0b0 RK |
3305 | -------------------------- |
3306 | -- Build_Body_To_Inline -- | |
3307 | -------------------------- | |
3308 | ||
d05ef0ab | 3309 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id) is |
f937473f | 3310 | Decl : constant Node_Id := Unit_Declaration_Node (Subp); |
996ae0b0 RK |
3311 | Original_Body : Node_Id; |
3312 | Body_To_Analyze : Node_Id; | |
3313 | Max_Size : constant := 10; | |
3314 | Stat_Count : Integer := 0; | |
3315 | ||
3316 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
e895b435 | 3317 | -- Check for declarations that make inlining not worthwhile |
996ae0b0 RK |
3318 | |
3319 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
82c80734 RD |
3320 | -- Check for statements that make inlining not worthwhile: any tasking |
3321 | -- statement, nested at any level. Keep track of total number of | |
3322 | -- elementary statements, as a measure of acceptable size. | |
996ae0b0 RK |
3323 | |
3324 | function Has_Pending_Instantiation return Boolean; | |
f937473f RD |
3325 | -- If some enclosing body contains instantiations that appear before the |
3326 | -- corresponding generic body, the enclosing body has a freeze node so | |
3327 | -- that it can be elaborated after the generic itself. This might | |
996ae0b0 RK |
3328 | -- conflict with subsequent inlinings, so that it is unsafe to try to |
3329 | -- inline in such a case. | |
3330 | ||
c8ef728f | 3331 | function Has_Single_Return return Boolean; |
f937473f RD |
3332 | -- In general we cannot inline functions that return unconstrained type. |
3333 | -- However, we can handle such functions if all return statements return | |
3334 | -- a local variable that is the only declaration in the body of the | |
3335 | -- function. In that case the call can be replaced by that local | |
3336 | -- variable as is done for other inlined calls. | |
c8ef728f | 3337 | |
fbf5a39b | 3338 | procedure Remove_Pragmas; |
76a69663 ES |
3339 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal |
3340 | -- parameter has no meaning when the body is inlined and the formals | |
3341 | -- are rewritten. Remove it from body to inline. The analysis of the | |
3342 | -- non-inlined body will handle the pragma properly. | |
996ae0b0 | 3343 | |
e895b435 ES |
3344 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean; |
3345 | -- If the body of the subprogram includes a call that returns an | |
3346 | -- unconstrained type, the secondary stack is involved, and it | |
3347 | -- is not worth inlining. | |
3348 | ||
996ae0b0 RK |
3349 | ------------------------------ |
3350 | -- Has_Excluded_Declaration -- | |
3351 | ------------------------------ | |
3352 | ||
3353 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
3354 | D : Node_Id; | |
3355 | ||
fbf5a39b | 3356 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; |
82c80734 RD |
3357 | -- Nested subprograms make a given body ineligible for inlining, but |
3358 | -- we make an exception for instantiations of unchecked conversion. | |
3359 | -- The body has not been analyzed yet, so check the name, and verify | |
3360 | -- that the visible entity with that name is the predefined unit. | |
3361 | ||
3362 | ----------------------------- | |
3363 | -- Is_Unchecked_Conversion -- | |
3364 | ----------------------------- | |
fbf5a39b AC |
3365 | |
3366 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
82c80734 | 3367 | Id : constant Node_Id := Name (D); |
fbf5a39b AC |
3368 | Conv : Entity_Id; |
3369 | ||
3370 | begin | |
3371 | if Nkind (Id) = N_Identifier | |
3372 | and then Chars (Id) = Name_Unchecked_Conversion | |
3373 | then | |
3374 | Conv := Current_Entity (Id); | |
3375 | ||
800621e0 | 3376 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) |
fbf5a39b AC |
3377 | and then Chars (Selector_Name (Id)) = Name_Unchecked_Conversion |
3378 | then | |
3379 | Conv := Current_Entity (Selector_Name (Id)); | |
fbf5a39b AC |
3380 | else |
3381 | return False; | |
3382 | end if; | |
3383 | ||
758c442c GD |
3384 | return Present (Conv) |
3385 | and then Is_Predefined_File_Name | |
3386 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
fbf5a39b AC |
3387 | and then Is_Intrinsic_Subprogram (Conv); |
3388 | end Is_Unchecked_Conversion; | |
3389 | ||
3390 | -- Start of processing for Has_Excluded_Declaration | |
3391 | ||
996ae0b0 RK |
3392 | begin |
3393 | D := First (Decls); | |
996ae0b0 | 3394 | while Present (D) loop |
800621e0 RD |
3395 | if (Nkind (D) = N_Function_Instantiation |
3396 | and then not Is_Unchecked_Conversion (D)) | |
3397 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
3398 | N_Package_Declaration, | |
3399 | N_Package_Instantiation, | |
3400 | N_Subprogram_Body, | |
3401 | N_Procedure_Instantiation, | |
3402 | N_Task_Type_Declaration) | |
996ae0b0 RK |
3403 | then |
3404 | Cannot_Inline | |
fbf5a39b | 3405 | ("cannot inline & (non-allowed declaration)?", D, Subp); |
996ae0b0 RK |
3406 | return True; |
3407 | end if; | |
3408 | ||
3409 | Next (D); | |
3410 | end loop; | |
3411 | ||
3412 | return False; | |
996ae0b0 RK |
3413 | end Has_Excluded_Declaration; |
3414 | ||
3415 | ---------------------------- | |
3416 | -- Has_Excluded_Statement -- | |
3417 | ---------------------------- | |
3418 | ||
3419 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
3420 | S : Node_Id; | |
3421 | E : Node_Id; | |
3422 | ||
3423 | begin | |
3424 | S := First (Stats); | |
996ae0b0 RK |
3425 | while Present (S) loop |
3426 | Stat_Count := Stat_Count + 1; | |
3427 | ||
800621e0 RD |
3428 | if Nkind_In (S, N_Abort_Statement, |
3429 | N_Asynchronous_Select, | |
3430 | N_Conditional_Entry_Call, | |
3431 | N_Delay_Relative_Statement, | |
3432 | N_Delay_Until_Statement, | |
3433 | N_Selective_Accept, | |
3434 | N_Timed_Entry_Call) | |
996ae0b0 RK |
3435 | then |
3436 | Cannot_Inline | |
fbf5a39b | 3437 | ("cannot inline & (non-allowed statement)?", S, Subp); |
996ae0b0 RK |
3438 | return True; |
3439 | ||
3440 | elsif Nkind (S) = N_Block_Statement then | |
3441 | if Present (Declarations (S)) | |
3442 | and then Has_Excluded_Declaration (Declarations (S)) | |
3443 | then | |
3444 | return True; | |
3445 | ||
3446 | elsif Present (Handled_Statement_Sequence (S)) | |
3447 | and then | |
3448 | (Present | |
3449 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
3450 | or else | |
3451 | Has_Excluded_Statement | |
3452 | (Statements (Handled_Statement_Sequence (S)))) | |
3453 | then | |
3454 | return True; | |
3455 | end if; | |
3456 | ||
3457 | elsif Nkind (S) = N_Case_Statement then | |
3458 | E := First (Alternatives (S)); | |
996ae0b0 RK |
3459 | while Present (E) loop |
3460 | if Has_Excluded_Statement (Statements (E)) then | |
3461 | return True; | |
3462 | end if; | |
3463 | ||
3464 | Next (E); | |
3465 | end loop; | |
3466 | ||
3467 | elsif Nkind (S) = N_If_Statement then | |
3468 | if Has_Excluded_Statement (Then_Statements (S)) then | |
3469 | return True; | |
3470 | end if; | |
3471 | ||
3472 | if Present (Elsif_Parts (S)) then | |
3473 | E := First (Elsif_Parts (S)); | |
996ae0b0 RK |
3474 | while Present (E) loop |
3475 | if Has_Excluded_Statement (Then_Statements (E)) then | |
3476 | return True; | |
3477 | end if; | |
3478 | Next (E); | |
3479 | end loop; | |
3480 | end if; | |
3481 | ||
3482 | if Present (Else_Statements (S)) | |
3483 | and then Has_Excluded_Statement (Else_Statements (S)) | |
3484 | then | |
3485 | return True; | |
3486 | end if; | |
3487 | ||
3488 | elsif Nkind (S) = N_Loop_Statement | |
3489 | and then Has_Excluded_Statement (Statements (S)) | |
3490 | then | |
3491 | return True; | |
3e2399ba AC |
3492 | |
3493 | elsif Nkind (S) = N_Extended_Return_Statement then | |
3494 | if Has_Excluded_Statement | |
3495 | (Statements (Handled_Statement_Sequence (S))) | |
3496 | or else Present | |
3497 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
3498 | then | |
3499 | return True; | |
3500 | end if; | |
996ae0b0 RK |
3501 | end if; |
3502 | ||
3503 | Next (S); | |
3504 | end loop; | |
3505 | ||
3506 | return False; | |
3507 | end Has_Excluded_Statement; | |
3508 | ||
3509 | ------------------------------- | |
3510 | -- Has_Pending_Instantiation -- | |
3511 | ------------------------------- | |
3512 | ||
3513 | function Has_Pending_Instantiation return Boolean is | |
ec4867fa | 3514 | S : Entity_Id; |
996ae0b0 RK |
3515 | |
3516 | begin | |
ec4867fa | 3517 | S := Current_Scope; |
996ae0b0 RK |
3518 | while Present (S) loop |
3519 | if Is_Compilation_Unit (S) | |
3520 | or else Is_Child_Unit (S) | |
3521 | then | |
3522 | return False; | |
bce79204 | 3523 | |
996ae0b0 RK |
3524 | elsif Ekind (S) = E_Package |
3525 | and then Has_Forward_Instantiation (S) | |
3526 | then | |
3527 | return True; | |
3528 | end if; | |
3529 | ||
3530 | S := Scope (S); | |
3531 | end loop; | |
3532 | ||
3533 | return False; | |
3534 | end Has_Pending_Instantiation; | |
3535 | ||
c8ef728f ES |
3536 | ------------------------ |
3537 | -- Has_Single_Return -- | |
3538 | ------------------------ | |
3539 | ||
3540 | function Has_Single_Return return Boolean is | |
3541 | Return_Statement : Node_Id := Empty; | |
3542 | ||
3543 | function Check_Return (N : Node_Id) return Traverse_Result; | |
3544 | ||
3545 | ------------------ | |
3546 | -- Check_Return -- | |
3547 | ------------------ | |
3548 | ||
3549 | function Check_Return (N : Node_Id) return Traverse_Result is | |
3550 | begin | |
5d37ba92 | 3551 | if Nkind (N) = N_Simple_Return_Statement then |
c8ef728f ES |
3552 | if Present (Expression (N)) |
3553 | and then Is_Entity_Name (Expression (N)) | |
3554 | then | |
3555 | if No (Return_Statement) then | |
3556 | Return_Statement := N; | |
3557 | return OK; | |
3558 | ||
3559 | elsif Chars (Expression (N)) = | |
3560 | Chars (Expression (Return_Statement)) | |
3561 | then | |
3562 | return OK; | |
3563 | ||
3564 | else | |
3565 | return Abandon; | |
3566 | end if; | |
3567 | ||
3e2399ba AC |
3568 | -- A return statement within an extended return is a noop |
3569 | -- after inlining. | |
3570 | ||
3571 | elsif No (Expression (N)) | |
3572 | and then Nkind (Parent (Parent (N))) = | |
3573 | N_Extended_Return_Statement | |
3574 | then | |
3575 | return OK; | |
3576 | ||
c8ef728f ES |
3577 | else |
3578 | -- Expression has wrong form | |
3579 | ||
3580 | return Abandon; | |
3581 | end if; | |
3582 | ||
3e2399ba AC |
3583 | -- We can only inline a build-in-place function if |
3584 | -- it has a single extended return. | |
3585 | ||
3586 | elsif Nkind (N) = N_Extended_Return_Statement then | |
3587 | if No (Return_Statement) then | |
3588 | Return_Statement := N; | |
3589 | return OK; | |
3590 | ||
3591 | else | |
3592 | return Abandon; | |
3593 | end if; | |
3594 | ||
c8ef728f ES |
3595 | else |
3596 | return OK; | |
3597 | end if; | |
3598 | end Check_Return; | |
3599 | ||
3600 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
3601 | ||
3602 | -- Start of processing for Has_Single_Return | |
3603 | ||
3604 | begin | |
3e2399ba AC |
3605 | if Check_All_Returns (N) /= OK then |
3606 | return False; | |
3607 | ||
3608 | elsif Nkind (Return_Statement) = N_Extended_Return_Statement then | |
3609 | return True; | |
3610 | ||
3611 | else | |
3612 | return Present (Declarations (N)) | |
3613 | and then Present (First (Declarations (N))) | |
3614 | and then Chars (Expression (Return_Statement)) = | |
3615 | Chars (Defining_Identifier (First (Declarations (N)))); | |
3616 | end if; | |
c8ef728f ES |
3617 | end Has_Single_Return; |
3618 | ||
fbf5a39b AC |
3619 | -------------------- |
3620 | -- Remove_Pragmas -- | |
3621 | -------------------- | |
3622 | ||
3623 | procedure Remove_Pragmas is | |
3624 | Decl : Node_Id; | |
3625 | Nxt : Node_Id; | |
3626 | ||
3627 | begin | |
3628 | Decl := First (Declarations (Body_To_Analyze)); | |
3629 | while Present (Decl) loop | |
3630 | Nxt := Next (Decl); | |
3631 | ||
3632 | if Nkind (Decl) = N_Pragma | |
76a69663 ES |
3633 | and then (Pragma_Name (Decl) = Name_Unreferenced |
3634 | or else | |
3635 | Pragma_Name (Decl) = Name_Unmodified) | |
fbf5a39b AC |
3636 | then |
3637 | Remove (Decl); | |
3638 | end if; | |
3639 | ||
3640 | Decl := Nxt; | |
3641 | end loop; | |
3642 | end Remove_Pragmas; | |
3643 | ||
e895b435 ES |
3644 | -------------------------- |
3645 | -- Uses_Secondary_Stack -- | |
3646 | -------------------------- | |
3647 | ||
3648 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean is | |
3649 | function Check_Call (N : Node_Id) return Traverse_Result; | |
3650 | -- Look for function calls that return an unconstrained type | |
3651 | ||
3652 | ---------------- | |
3653 | -- Check_Call -- | |
3654 | ---------------- | |
3655 | ||
3656 | function Check_Call (N : Node_Id) return Traverse_Result is | |
3657 | begin | |
3658 | if Nkind (N) = N_Function_Call | |
3659 | and then Is_Entity_Name (Name (N)) | |
3660 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
3661 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
3662 | then | |
3663 | Cannot_Inline | |
3664 | ("cannot inline & (call returns unconstrained type)?", | |
3665 | N, Subp); | |
3666 | return Abandon; | |
3667 | else | |
3668 | return OK; | |
3669 | end if; | |
3670 | end Check_Call; | |
3671 | ||
3672 | function Check_Calls is new Traverse_Func (Check_Call); | |
3673 | ||
3674 | begin | |
3675 | return Check_Calls (Bod) = Abandon; | |
3676 | end Uses_Secondary_Stack; | |
3677 | ||
996ae0b0 RK |
3678 | -- Start of processing for Build_Body_To_Inline |
3679 | ||
3680 | begin | |
8dbd1460 AC |
3681 | -- Return immediately if done already |
3682 | ||
996ae0b0 RK |
3683 | if Nkind (Decl) = N_Subprogram_Declaration |
3684 | and then Present (Body_To_Inline (Decl)) | |
3685 | then | |
8dbd1460 | 3686 | return; |
996ae0b0 | 3687 | |
08402a6d ES |
3688 | -- Functions that return unconstrained composite types require |
3689 | -- secondary stack handling, and cannot currently be inlined, unless | |
3690 | -- all return statements return a local variable that is the first | |
3691 | -- local declaration in the body. | |
996ae0b0 RK |
3692 | |
3693 | elsif Ekind (Subp) = E_Function | |
3694 | and then not Is_Scalar_Type (Etype (Subp)) | |
3695 | and then not Is_Access_Type (Etype (Subp)) | |
3696 | and then not Is_Constrained (Etype (Subp)) | |
3697 | then | |
08402a6d ES |
3698 | if not Has_Single_Return then |
3699 | Cannot_Inline | |
3700 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
3701 | return; | |
3702 | end if; | |
3703 | ||
3704 | -- Ditto for functions that return controlled types, where controlled | |
3705 | -- actions interfere in complex ways with inlining. | |
2820d220 AC |
3706 | |
3707 | elsif Ekind (Subp) = E_Function | |
048e5cef | 3708 | and then Needs_Finalization (Etype (Subp)) |
2820d220 AC |
3709 | then |
3710 | Cannot_Inline | |
3711 | ("cannot inline & (controlled return type)?", N, Subp); | |
3712 | return; | |
996ae0b0 RK |
3713 | end if; |
3714 | ||
d05ef0ab AC |
3715 | if Present (Declarations (N)) |
3716 | and then Has_Excluded_Declaration (Declarations (N)) | |
996ae0b0 | 3717 | then |
d05ef0ab | 3718 | return; |
996ae0b0 RK |
3719 | end if; |
3720 | ||
3721 | if Present (Handled_Statement_Sequence (N)) then | |
fbf5a39b AC |
3722 | if Present (Exception_Handlers (Handled_Statement_Sequence (N))) then |
3723 | Cannot_Inline | |
3724 | ("cannot inline& (exception handler)?", | |
3725 | First (Exception_Handlers (Handled_Statement_Sequence (N))), | |
3726 | Subp); | |
d05ef0ab | 3727 | return; |
996ae0b0 RK |
3728 | elsif |
3729 | Has_Excluded_Statement | |
3730 | (Statements (Handled_Statement_Sequence (N))) | |
3731 | then | |
d05ef0ab | 3732 | return; |
996ae0b0 RK |
3733 | end if; |
3734 | end if; | |
3735 | ||
3736 | -- We do not inline a subprogram that is too large, unless it is | |
3737 | -- marked Inline_Always. This pragma does not suppress the other | |
3738 | -- checks on inlining (forbidden declarations, handlers, etc). | |
3739 | ||
3740 | if Stat_Count > Max_Size | |
800621e0 | 3741 | and then not Has_Pragma_Inline_Always (Subp) |
996ae0b0 | 3742 | then |
fbf5a39b | 3743 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); |
d05ef0ab | 3744 | return; |
996ae0b0 RK |
3745 | end if; |
3746 | ||
3747 | if Has_Pending_Instantiation then | |
3748 | Cannot_Inline | |
fbf5a39b AC |
3749 | ("cannot inline& (forward instance within enclosing body)?", |
3750 | N, Subp); | |
d05ef0ab AC |
3751 | return; |
3752 | end if; | |
3753 | ||
3754 | -- Within an instance, the body to inline must be treated as a nested | |
3755 | -- generic, so that the proper global references are preserved. | |
3756 | ||
ce4e59c4 ST |
3757 | -- Note that we do not do this at the library level, because it is not |
3758 | -- needed, and furthermore this causes trouble if front end inlining | |
3759 | -- is activated (-gnatN). | |
3760 | ||
3761 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
3762 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); |
3763 | Original_Body := Copy_Generic_Node (N, Empty, True); | |
3764 | else | |
3765 | Original_Body := Copy_Separate_Tree (N); | |
996ae0b0 RK |
3766 | end if; |
3767 | ||
d05ef0ab AC |
3768 | -- We need to capture references to the formals in order to substitute |
3769 | -- the actuals at the point of inlining, i.e. instantiation. To treat | |
3770 | -- the formals as globals to the body to inline, we nest it within | |
3771 | -- a dummy parameterless subprogram, declared within the real one. | |
24105bab AC |
3772 | -- To avoid generating an internal name (which is never public, and |
3773 | -- which affects serial numbers of other generated names), we use | |
3774 | -- an internal symbol that cannot conflict with user declarations. | |
d05ef0ab AC |
3775 | |
3776 | Set_Parameter_Specifications (Specification (Original_Body), No_List); | |
24105bab AC |
3777 | Set_Defining_Unit_Name |
3778 | (Specification (Original_Body), | |
3779 | Make_Defining_Identifier (Sloc (N), Name_uParent)); | |
d05ef0ab AC |
3780 | Set_Corresponding_Spec (Original_Body, Empty); |
3781 | ||
996ae0b0 RK |
3782 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); |
3783 | ||
3784 | -- Set return type of function, which is also global and does not need | |
3785 | -- to be resolved. | |
3786 | ||
3787 | if Ekind (Subp) = E_Function then | |
41251c60 | 3788 | Set_Result_Definition (Specification (Body_To_Analyze), |
996ae0b0 RK |
3789 | New_Occurrence_Of (Etype (Subp), Sloc (N))); |
3790 | end if; | |
3791 | ||
3792 | if No (Declarations (N)) then | |
3793 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
3794 | else | |
3795 | Append (Body_To_Analyze, Declarations (N)); | |
3796 | end if; | |
3797 | ||
3798 | Expander_Mode_Save_And_Set (False); | |
fbf5a39b | 3799 | Remove_Pragmas; |
996ae0b0 RK |
3800 | |
3801 | Analyze (Body_To_Analyze); | |
0a36105d | 3802 | Push_Scope (Defining_Entity (Body_To_Analyze)); |
996ae0b0 RK |
3803 | Save_Global_References (Original_Body); |
3804 | End_Scope; | |
3805 | Remove (Body_To_Analyze); | |
3806 | ||
3807 | Expander_Mode_Restore; | |
d05ef0ab | 3808 | |
ce4e59c4 ST |
3809 | -- Restore environment if previously saved |
3810 | ||
3811 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
3812 | Restore_Env; |
3813 | end if; | |
e895b435 ES |
3814 | |
3815 | -- If secondary stk used there is no point in inlining. We have | |
3816 | -- already issued the warning in this case, so nothing to do. | |
3817 | ||
3818 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
3819 | return; | |
3820 | end if; | |
3821 | ||
3822 | Set_Body_To_Inline (Decl, Original_Body); | |
3823 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Subp)); | |
3824 | Set_Is_Inlined (Subp); | |
996ae0b0 RK |
3825 | end Build_Body_To_Inline; |
3826 | ||
fbf5a39b AC |
3827 | ------------------- |
3828 | -- Cannot_Inline -- | |
3829 | ------------------- | |
3830 | ||
3831 | procedure Cannot_Inline (Msg : String; N : Node_Id; Subp : Entity_Id) is | |
3832 | begin | |
676e8420 AC |
3833 | -- Do not emit warning if this is a predefined unit which is not the |
3834 | -- main unit. With validity checks enabled, some predefined subprograms | |
3835 | -- may contain nested subprograms and become ineligible for inlining. | |
fbf5a39b AC |
3836 | |
3837 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
3838 | and then not In_Extended_Main_Source_Unit (Subp) | |
3839 | then | |
3840 | null; | |
3841 | ||
800621e0 | 3842 | elsif Has_Pragma_Inline_Always (Subp) then |
e895b435 ES |
3843 | |
3844 | -- Remove last character (question mark) to make this into an error, | |
3845 | -- because the Inline_Always pragma cannot be obeyed. | |
3846 | ||
ec4867fa | 3847 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); |
fbf5a39b AC |
3848 | |
3849 | elsif Ineffective_Inline_Warnings then | |
3850 | Error_Msg_NE (Msg, N, Subp); | |
3851 | end if; | |
3852 | end Cannot_Inline; | |
3853 | ||
996ae0b0 RK |
3854 | ----------------------- |
3855 | -- Check_Conformance -- | |
3856 | ----------------------- | |
3857 | ||
3858 | procedure Check_Conformance | |
41251c60 JM |
3859 | (New_Id : Entity_Id; |
3860 | Old_Id : Entity_Id; | |
3861 | Ctype : Conformance_Type; | |
3862 | Errmsg : Boolean; | |
3863 | Conforms : out Boolean; | |
3864 | Err_Loc : Node_Id := Empty; | |
3865 | Get_Inst : Boolean := False; | |
3866 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 3867 | is |
996ae0b0 | 3868 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
3869 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
3870 | -- If Errmsg is True, then processing continues to post an error message | |
3871 | -- for conformance error on given node. Two messages are output. The | |
3872 | -- first message points to the previous declaration with a general "no | |
3873 | -- conformance" message. The second is the detailed reason, supplied as | |
3874 | -- Msg. The parameter N provide information for a possible & insertion | |
3875 | -- in the message, and also provides the location for posting the | |
3876 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
3877 | |
3878 | ----------------------- | |
3879 | -- Conformance_Error -- | |
3880 | ----------------------- | |
3881 | ||
3882 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
3883 | Enode : Node_Id; | |
3884 | ||
3885 | begin | |
3886 | Conforms := False; | |
3887 | ||
3888 | if Errmsg then | |
3889 | if No (Err_Loc) then | |
3890 | Enode := N; | |
3891 | else | |
3892 | Enode := Err_Loc; | |
3893 | end if; | |
3894 | ||
3895 | Error_Msg_Sloc := Sloc (Old_Id); | |
3896 | ||
3897 | case Ctype is | |
3898 | when Type_Conformant => | |
483c78cb | 3899 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
3900 | ("not type conformant with declaration#!", Enode); |
3901 | ||
3902 | when Mode_Conformant => | |
19590d70 | 3903 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 3904 | Error_Msg_N |
19590d70 GD |
3905 | ("not mode conformant with operation inherited#!", |
3906 | Enode); | |
3907 | else | |
ed2233dc | 3908 | Error_Msg_N |
19590d70 GD |
3909 | ("not mode conformant with declaration#!", Enode); |
3910 | end if; | |
996ae0b0 RK |
3911 | |
3912 | when Subtype_Conformant => | |
19590d70 | 3913 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 3914 | Error_Msg_N |
19590d70 GD |
3915 | ("not subtype conformant with operation inherited#!", |
3916 | Enode); | |
3917 | else | |
ed2233dc | 3918 | Error_Msg_N |
19590d70 GD |
3919 | ("not subtype conformant with declaration#!", Enode); |
3920 | end if; | |
996ae0b0 RK |
3921 | |
3922 | when Fully_Conformant => | |
19590d70 | 3923 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 3924 | Error_Msg_N -- CODEFIX |
19590d70 GD |
3925 | ("not fully conformant with operation inherited#!", |
3926 | Enode); | |
3927 | else | |
483c78cb | 3928 | Error_Msg_N -- CODEFIX |
19590d70 GD |
3929 | ("not fully conformant with declaration#!", Enode); |
3930 | end if; | |
996ae0b0 RK |
3931 | end case; |
3932 | ||
3933 | Error_Msg_NE (Msg, Enode, N); | |
3934 | end if; | |
3935 | end Conformance_Error; | |
3936 | ||
ec4867fa ES |
3937 | -- Local Variables |
3938 | ||
3939 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
3940 | New_Type : constant Entity_Id := Etype (New_Id); | |
3941 | Old_Formal : Entity_Id; | |
3942 | New_Formal : Entity_Id; | |
3943 | Access_Types_Match : Boolean; | |
3944 | Old_Formal_Base : Entity_Id; | |
3945 | New_Formal_Base : Entity_Id; | |
3946 | ||
996ae0b0 RK |
3947 | -- Start of processing for Check_Conformance |
3948 | ||
3949 | begin | |
3950 | Conforms := True; | |
3951 | ||
82c80734 RD |
3952 | -- We need a special case for operators, since they don't appear |
3953 | -- explicitly. | |
996ae0b0 RK |
3954 | |
3955 | if Ctype = Type_Conformant then | |
3956 | if Ekind (New_Id) = E_Operator | |
3957 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
3958 | then | |
3959 | return; | |
3960 | end if; | |
3961 | end if; | |
3962 | ||
3963 | -- If both are functions/operators, check return types conform | |
3964 | ||
3965 | if Old_Type /= Standard_Void_Type | |
3966 | and then New_Type /= Standard_Void_Type | |
3967 | then | |
fceeaab6 ES |
3968 | |
3969 | -- If we are checking interface conformance we omit controlling | |
3970 | -- arguments and result, because we are only checking the conformance | |
3971 | -- of the remaining parameters. | |
3972 | ||
3973 | if Has_Controlling_Result (Old_Id) | |
3974 | and then Has_Controlling_Result (New_Id) | |
3975 | and then Skip_Controlling_Formals | |
3976 | then | |
3977 | null; | |
3978 | ||
3979 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
5d37ba92 | 3980 | Conformance_Error ("\return type does not match!", New_Id); |
996ae0b0 RK |
3981 | return; |
3982 | end if; | |
3983 | ||
41251c60 | 3984 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 3985 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 3986 | |
0791fbe9 | 3987 | if Ada_Version >= Ada_2005 |
41251c60 JM |
3988 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
3989 | and then | |
3990 | (Can_Never_Be_Null (Old_Type) | |
3991 | /= Can_Never_Be_Null (New_Type) | |
3992 | or else Is_Access_Constant (Etype (Old_Type)) | |
3993 | /= Is_Access_Constant (Etype (New_Type))) | |
3994 | then | |
5d37ba92 | 3995 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
3996 | return; |
3997 | end if; | |
3998 | ||
996ae0b0 RK |
3999 | -- If either is a function/operator and the other isn't, error |
4000 | ||
4001 | elsif Old_Type /= Standard_Void_Type | |
4002 | or else New_Type /= Standard_Void_Type | |
4003 | then | |
5d37ba92 | 4004 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
4005 | return; |
4006 | end if; | |
4007 | ||
0a36105d | 4008 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
4009 | -- If this is a renaming as body, refine error message to indicate that |
4010 | -- the conflict is with the original declaration. If the entity is not | |
4011 | -- frozen, the conventions don't have to match, the one of the renamed | |
4012 | -- entity is inherited. | |
4013 | ||
4014 | if Ctype >= Subtype_Conformant then | |
996ae0b0 RK |
4015 | if Convention (Old_Id) /= Convention (New_Id) then |
4016 | ||
4017 | if not Is_Frozen (New_Id) then | |
4018 | null; | |
4019 | ||
4020 | elsif Present (Err_Loc) | |
4021 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
4022 | and then Present (Corresponding_Spec (Err_Loc)) | |
4023 | then | |
4024 | Error_Msg_Name_1 := Chars (New_Id); | |
4025 | Error_Msg_Name_2 := | |
4026 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 4027 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
4028 | |
4029 | else | |
5d37ba92 | 4030 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
4031 | end if; |
4032 | ||
4033 | return; | |
4034 | ||
4035 | elsif Is_Formal_Subprogram (Old_Id) | |
4036 | or else Is_Formal_Subprogram (New_Id) | |
4037 | then | |
5d37ba92 | 4038 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 RK |
4039 | return; |
4040 | end if; | |
4041 | end if; | |
4042 | ||
4043 | -- Deal with parameters | |
4044 | ||
4045 | -- Note: we use the entity information, rather than going directly | |
4046 | -- to the specification in the tree. This is not only simpler, but | |
4047 | -- absolutely necessary for some cases of conformance tests between | |
4048 | -- operators, where the declaration tree simply does not exist! | |
4049 | ||
4050 | Old_Formal := First_Formal (Old_Id); | |
4051 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 4052 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
4053 | if Is_Controlling_Formal (Old_Formal) |
4054 | and then Is_Controlling_Formal (New_Formal) | |
4055 | and then Skip_Controlling_Formals | |
4056 | then | |
a2dc5812 AC |
4057 | -- The controlling formals will have different types when |
4058 | -- comparing an interface operation with its match, but both | |
4059 | -- or neither must be access parameters. | |
4060 | ||
4061 | if Is_Access_Type (Etype (Old_Formal)) | |
4062 | = | |
4063 | Is_Access_Type (Etype (New_Formal)) | |
4064 | then | |
4065 | goto Skip_Controlling_Formal; | |
4066 | else | |
4067 | Conformance_Error | |
4068 | ("\access parameter does not match!", New_Formal); | |
4069 | end if; | |
41251c60 JM |
4070 | end if; |
4071 | ||
fbf5a39b AC |
4072 | if Ctype = Fully_Conformant then |
4073 | ||
4074 | -- Names must match. Error message is more accurate if we do | |
4075 | -- this before checking that the types of the formals match. | |
4076 | ||
4077 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
5d37ba92 | 4078 | Conformance_Error ("\name & does not match!", New_Formal); |
fbf5a39b AC |
4079 | |
4080 | -- Set error posted flag on new formal as well to stop | |
4081 | -- junk cascaded messages in some cases. | |
4082 | ||
4083 | Set_Error_Posted (New_Formal); | |
4084 | return; | |
4085 | end if; | |
40b93859 RD |
4086 | |
4087 | -- Null exclusion must match | |
4088 | ||
4089 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
4090 | /= | |
4091 | Null_Exclusion_Present (Parent (New_Formal)) | |
4092 | then | |
4093 | -- Only give error if both come from source. This should be | |
4094 | -- investigated some time, since it should not be needed ??? | |
4095 | ||
4096 | if Comes_From_Source (Old_Formal) | |
4097 | and then | |
4098 | Comes_From_Source (New_Formal) | |
4099 | then | |
4100 | Conformance_Error | |
4101 | ("\null exclusion for & does not match", New_Formal); | |
4102 | ||
4103 | -- Mark error posted on the new formal to avoid duplicated | |
4104 | -- complaint about types not matching. | |
4105 | ||
4106 | Set_Error_Posted (New_Formal); | |
4107 | end if; | |
4108 | end if; | |
fbf5a39b | 4109 | end if; |
996ae0b0 | 4110 | |
ec4867fa ES |
4111 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
4112 | -- case occurs whenever a subprogram is being renamed and one of its | |
4113 | -- parameters imposes a null exclusion. For example: | |
4114 | ||
4115 | -- type T is null record; | |
4116 | -- type Acc_T is access T; | |
4117 | -- subtype Acc_T_Sub is Acc_T; | |
4118 | ||
4119 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
4120 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
4121 | -- renames P; | |
4122 | ||
4123 | Old_Formal_Base := Etype (Old_Formal); | |
4124 | New_Formal_Base := Etype (New_Formal); | |
4125 | ||
4126 | if Get_Inst then | |
4127 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
4128 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
4129 | end if; | |
4130 | ||
0791fbe9 | 4131 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa ES |
4132 | |
4133 | -- Ensure that this rule is only applied when New_Id is a | |
5d37ba92 | 4134 | -- renaming of Old_Id. |
ec4867fa | 4135 | |
5d37ba92 ES |
4136 | and then Nkind (Parent (Parent (New_Id))) = |
4137 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
4138 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
4139 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
4140 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
4141 | ||
4142 | -- Now handle the allowed access-type case | |
4143 | ||
4144 | and then Is_Access_Type (Old_Formal_Base) | |
4145 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 ES |
4146 | |
4147 | -- The type kinds must match. The only exception occurs with | |
4148 | -- multiple generics of the form: | |
4149 | ||
4150 | -- generic generic | |
4151 | -- type F is private; type A is private; | |
4152 | -- type F_Ptr is access F; type A_Ptr is access A; | |
4153 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
4154 | -- package F_Pack is ... package A_Pack is | |
4155 | -- package F_Inst is | |
4156 | -- new F_Pack (A, A_Ptr, A_P); | |
4157 | ||
4158 | -- When checking for conformance between the parameters of A_P | |
4159 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
4160 | -- because the compiler has transformed A_Ptr into a subtype of | |
4161 | -- F_Ptr. We catch this case in the code below. | |
4162 | ||
4163 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4164 | or else | |
4165 | (Is_Generic_Type (Old_Formal_Base) | |
4166 | and then Is_Generic_Type (New_Formal_Base) | |
4167 | and then Is_Internal (New_Formal_Base) | |
4168 | and then Etype (Etype (New_Formal_Base)) = | |
4169 | Old_Formal_Base)) | |
ec4867fa ES |
4170 | and then Directly_Designated_Type (Old_Formal_Base) = |
4171 | Directly_Designated_Type (New_Formal_Base) | |
4172 | and then ((Is_Itype (Old_Formal_Base) | |
4173 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
4174 | or else | |
4175 | (Is_Itype (New_Formal_Base) | |
4176 | and then Can_Never_Be_Null (New_Formal_Base))); | |
4177 | ||
996ae0b0 RK |
4178 | -- Types must always match. In the visible part of an instance, |
4179 | -- usual overloading rules for dispatching operations apply, and | |
4180 | -- we check base types (not the actual subtypes). | |
4181 | ||
4182 | if In_Instance_Visible_Part | |
4183 | and then Is_Dispatching_Operation (New_Id) | |
4184 | then | |
4185 | if not Conforming_Types | |
ec4867fa ES |
4186 | (T1 => Base_Type (Etype (Old_Formal)), |
4187 | T2 => Base_Type (Etype (New_Formal)), | |
4188 | Ctype => Ctype, | |
4189 | Get_Inst => Get_Inst) | |
4190 | and then not Access_Types_Match | |
996ae0b0 | 4191 | then |
5d37ba92 | 4192 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
4193 | return; |
4194 | end if; | |
4195 | ||
4196 | elsif not Conforming_Types | |
5d37ba92 ES |
4197 | (T1 => Old_Formal_Base, |
4198 | T2 => New_Formal_Base, | |
ec4867fa ES |
4199 | Ctype => Ctype, |
4200 | Get_Inst => Get_Inst) | |
4201 | and then not Access_Types_Match | |
996ae0b0 | 4202 | then |
c27f2f15 RD |
4203 | -- Don't give error message if old type is Any_Type. This test |
4204 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
4205 | ||
4206 | if Errmsg and then Old_Formal_Base = Any_Type then | |
4207 | Conforms := False; | |
4208 | else | |
4209 | Conformance_Error ("\type of & does not match!", New_Formal); | |
4210 | end if; | |
4211 | ||
996ae0b0 RK |
4212 | return; |
4213 | end if; | |
4214 | ||
4215 | -- For mode conformance, mode must match | |
4216 | ||
5d37ba92 ES |
4217 | if Ctype >= Mode_Conformant then |
4218 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
4219 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
4220 | return; | |
4221 | ||
4222 | -- Part of mode conformance for access types is having the same | |
4223 | -- constant modifier. | |
4224 | ||
4225 | elsif Access_Types_Match | |
4226 | and then Is_Access_Constant (Old_Formal_Base) /= | |
4227 | Is_Access_Constant (New_Formal_Base) | |
4228 | then | |
4229 | Conformance_Error | |
4230 | ("\constant modifier does not match!", New_Formal); | |
4231 | return; | |
4232 | end if; | |
996ae0b0 RK |
4233 | end if; |
4234 | ||
0a36105d | 4235 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 4236 | |
0a36105d JM |
4237 | -- Ada 2005 (AI-231): In case of anonymous access types check |
4238 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
4239 | -- match. For null exclusion, we test the types rather than the |
4240 | -- formals themselves, since the attribute is only set reliably | |
4241 | -- on the formals in the Ada 95 case, and we exclude the case | |
4242 | -- where Old_Formal is marked as controlling, to avoid errors | |
4243 | -- when matching completing bodies with dispatching declarations | |
4244 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 4245 | |
0791fbe9 | 4246 | if Ada_Version >= Ada_2005 |
0a36105d JM |
4247 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
4248 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
4249 | and then | |
c7b9d548 AC |
4250 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
4251 | Can_Never_Be_Null (Etype (New_Formal)) | |
4252 | and then | |
4253 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
4254 | or else |
4255 | Is_Access_Constant (Etype (Old_Formal)) /= | |
4256 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
4257 | |
4258 | -- Do not complain if error already posted on New_Formal. This | |
4259 | -- avoids some redundant error messages. | |
4260 | ||
4261 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
4262 | then |
4263 | -- It is allowed to omit the null-exclusion in case of stream | |
4264 | -- attribute subprograms. We recognize stream subprograms | |
4265 | -- through their TSS-generated suffix. | |
996ae0b0 | 4266 | |
0a36105d JM |
4267 | declare |
4268 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
4269 | begin | |
4270 | if TSS_Name /= TSS_Stream_Read | |
4271 | and then TSS_Name /= TSS_Stream_Write | |
4272 | and then TSS_Name /= TSS_Stream_Input | |
4273 | and then TSS_Name /= TSS_Stream_Output | |
4274 | then | |
4275 | Conformance_Error | |
5d37ba92 | 4276 | ("\type of & does not match!", New_Formal); |
0a36105d JM |
4277 | return; |
4278 | end if; | |
4279 | end; | |
4280 | end if; | |
4281 | end if; | |
41251c60 | 4282 | |
0a36105d | 4283 | -- Full conformance checks |
41251c60 | 4284 | |
0a36105d | 4285 | if Ctype = Fully_Conformant then |
e660dbf7 | 4286 | |
0a36105d | 4287 | -- We have checked already that names match |
e660dbf7 | 4288 | |
0a36105d | 4289 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
4290 | |
4291 | -- Check default expressions for in parameters | |
4292 | ||
996ae0b0 RK |
4293 | declare |
4294 | NewD : constant Boolean := | |
4295 | Present (Default_Value (New_Formal)); | |
4296 | OldD : constant Boolean := | |
4297 | Present (Default_Value (Old_Formal)); | |
4298 | begin | |
4299 | if NewD or OldD then | |
4300 | ||
82c80734 RD |
4301 | -- The old default value has been analyzed because the |
4302 | -- current full declaration will have frozen everything | |
0a36105d JM |
4303 | -- before. The new default value has not been analyzed, |
4304 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
4305 | |
4306 | if NewD then | |
0a36105d | 4307 | Push_Scope (New_Id); |
21d27997 | 4308 | Preanalyze_Spec_Expression |
fbf5a39b | 4309 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
4310 | End_Scope; |
4311 | end if; | |
4312 | ||
4313 | if not (NewD and OldD) | |
4314 | or else not Fully_Conformant_Expressions | |
4315 | (Default_Value (Old_Formal), | |
4316 | Default_Value (New_Formal)) | |
4317 | then | |
4318 | Conformance_Error | |
5d37ba92 | 4319 | ("\default expression for & does not match!", |
996ae0b0 RK |
4320 | New_Formal); |
4321 | return; | |
4322 | end if; | |
4323 | end if; | |
4324 | end; | |
4325 | end if; | |
4326 | end if; | |
4327 | ||
4328 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 4329 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
4330 | -- or if either old or new instance is not from the source program. |
4331 | ||
0ab80019 | 4332 | if Ada_Version = Ada_83 |
996ae0b0 RK |
4333 | and then Sloc (Old_Id) > Standard_Location |
4334 | and then Sloc (New_Id) > Standard_Location | |
4335 | and then Comes_From_Source (Old_Id) | |
4336 | and then Comes_From_Source (New_Id) | |
4337 | then | |
4338 | declare | |
4339 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
4340 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
4341 | ||
4342 | begin | |
4343 | -- Explicit IN must be present or absent in both cases. This | |
4344 | -- test is required only in the full conformance case. | |
4345 | ||
4346 | if In_Present (Old_Param) /= In_Present (New_Param) | |
4347 | and then Ctype = Fully_Conformant | |
4348 | then | |
4349 | Conformance_Error | |
5d37ba92 | 4350 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
4351 | New_Formal); |
4352 | return; | |
4353 | end if; | |
4354 | ||
4355 | -- Grouping (use of comma in param lists) must be the same | |
4356 | -- This is where we catch a misconformance like: | |
4357 | ||
0a36105d | 4358 | -- A, B : Integer |
996ae0b0 RK |
4359 | -- A : Integer; B : Integer |
4360 | ||
4361 | -- which are represented identically in the tree except | |
4362 | -- for the setting of the flags More_Ids and Prev_Ids. | |
4363 | ||
4364 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
4365 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
4366 | then | |
4367 | Conformance_Error | |
5d37ba92 | 4368 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
4369 | return; |
4370 | end if; | |
4371 | end; | |
4372 | end if; | |
4373 | ||
41251c60 JM |
4374 | -- This label is required when skipping controlling formals |
4375 | ||
4376 | <<Skip_Controlling_Formal>> | |
4377 | ||
996ae0b0 RK |
4378 | Next_Formal (Old_Formal); |
4379 | Next_Formal (New_Formal); | |
4380 | end loop; | |
4381 | ||
4382 | if Present (Old_Formal) then | |
5d37ba92 | 4383 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
4384 | return; |
4385 | ||
4386 | elsif Present (New_Formal) then | |
5d37ba92 | 4387 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
4388 | return; |
4389 | end if; | |
996ae0b0 RK |
4390 | end Check_Conformance; |
4391 | ||
ec4867fa ES |
4392 | ----------------------- |
4393 | -- Check_Conventions -- | |
4394 | ----------------------- | |
4395 | ||
4396 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 4397 | Ifaces_List : Elist_Id; |
0a36105d | 4398 | |
ce2b6ba5 | 4399 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
4400 | -- Verify that the convention of inherited dispatching operation Op is |
4401 | -- consistent among all subprograms it overrides. In order to minimize | |
4402 | -- the search, Search_From is utilized to designate a specific point in | |
4403 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
4404 | |
4405 | ---------------------- | |
4406 | -- Check_Convention -- | |
4407 | ---------------------- | |
4408 | ||
ce2b6ba5 JM |
4409 | procedure Check_Convention (Op : Entity_Id) is |
4410 | Iface_Elmt : Elmt_Id; | |
4411 | Iface_Prim_Elmt : Elmt_Id; | |
4412 | Iface_Prim : Entity_Id; | |
ec4867fa | 4413 | |
ce2b6ba5 JM |
4414 | begin |
4415 | Iface_Elmt := First_Elmt (Ifaces_List); | |
4416 | while Present (Iface_Elmt) loop | |
4417 | Iface_Prim_Elmt := | |
4418 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); | |
4419 | while Present (Iface_Prim_Elmt) loop | |
4420 | Iface_Prim := Node (Iface_Prim_Elmt); | |
4421 | ||
4422 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
4423 | and then Convention (Iface_Prim) /= Convention (Op) | |
4424 | then | |
ed2233dc | 4425 | Error_Msg_N |
ce2b6ba5 | 4426 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 4427 | |
ce2b6ba5 JM |
4428 | Error_Msg_Name_1 := Chars (Op); |
4429 | Error_Msg_Name_2 := Get_Convention_Name (Convention (Op)); | |
4430 | Error_Msg_Sloc := Sloc (Op); | |
ec4867fa | 4431 | |
7a963087 | 4432 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 4433 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 4434 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 4435 | else |
ed2233dc | 4436 | Error_Msg_N |
19d846a0 RD |
4437 | ("\\overriding operation % with " & |
4438 | "convention % defined #", Typ); | |
ce2b6ba5 | 4439 | end if; |
ec4867fa | 4440 | |
ce2b6ba5 JM |
4441 | else pragma Assert (Present (Alias (Op))); |
4442 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
ed2233dc | 4443 | Error_Msg_N |
19d846a0 RD |
4444 | ("\\inherited operation % with " & |
4445 | "convention % defined #", Typ); | |
ce2b6ba5 | 4446 | end if; |
ec4867fa | 4447 | |
ce2b6ba5 JM |
4448 | Error_Msg_Name_1 := Chars (Op); |
4449 | Error_Msg_Name_2 := | |
4450 | Get_Convention_Name (Convention (Iface_Prim)); | |
4451 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
ed2233dc | 4452 | Error_Msg_N |
19d846a0 RD |
4453 | ("\\overridden operation % with " & |
4454 | "convention % defined #", Typ); | |
ec4867fa | 4455 | |
ce2b6ba5 | 4456 | -- Avoid cascading errors |
ec4867fa | 4457 | |
ce2b6ba5 JM |
4458 | return; |
4459 | end if; | |
ec4867fa | 4460 | |
ce2b6ba5 JM |
4461 | Next_Elmt (Iface_Prim_Elmt); |
4462 | end loop; | |
ec4867fa | 4463 | |
ce2b6ba5 | 4464 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
4465 | end loop; |
4466 | end Check_Convention; | |
4467 | ||
4468 | -- Local variables | |
4469 | ||
4470 | Prim_Op : Entity_Id; | |
4471 | Prim_Op_Elmt : Elmt_Id; | |
4472 | ||
4473 | -- Start of processing for Check_Conventions | |
4474 | ||
4475 | begin | |
ce2b6ba5 JM |
4476 | if not Has_Interfaces (Typ) then |
4477 | return; | |
4478 | end if; | |
4479 | ||
4480 | Collect_Interfaces (Typ, Ifaces_List); | |
4481 | ||
0a36105d JM |
4482 | -- The algorithm checks every overriding dispatching operation against |
4483 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 4484 | -- differences in conventions. |
ec4867fa ES |
4485 | |
4486 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
4487 | while Present (Prim_Op_Elmt) loop | |
4488 | Prim_Op := Node (Prim_Op_Elmt); | |
4489 | ||
0a36105d | 4490 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 4491 | -- since they always have the same convention. |
ec4867fa | 4492 | |
ce2b6ba5 JM |
4493 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
4494 | Check_Convention (Prim_Op); | |
ec4867fa ES |
4495 | end if; |
4496 | ||
4497 | Next_Elmt (Prim_Op_Elmt); | |
4498 | end loop; | |
4499 | end Check_Conventions; | |
4500 | ||
996ae0b0 RK |
4501 | ------------------------------ |
4502 | -- Check_Delayed_Subprogram -- | |
4503 | ------------------------------ | |
4504 | ||
4505 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
4506 | F : Entity_Id; | |
4507 | ||
4508 | procedure Possible_Freeze (T : Entity_Id); | |
4509 | -- T is the type of either a formal parameter or of the return type. | |
4510 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
4511 | -- subprogram itself must be delayed. If T is the limited view of an |
4512 | -- incomplete type the subprogram must be frozen as well, because | |
4513 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 4514 | |
82c80734 RD |
4515 | --------------------- |
4516 | -- Possible_Freeze -- | |
4517 | --------------------- | |
4518 | ||
996ae0b0 RK |
4519 | procedure Possible_Freeze (T : Entity_Id) is |
4520 | begin | |
4a13695c | 4521 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
4522 | Set_Has_Delayed_Freeze (Designator); |
4523 | ||
4524 | elsif Is_Access_Type (T) | |
4525 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
4526 | and then not Is_Frozen (Designated_Type (T)) | |
4527 | then | |
4528 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 4529 | |
4a13695c | 4530 | elsif Ekind (T) = E_Incomplete_Type and then From_With_Type (T) then |
e358346d | 4531 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 4532 | |
9aff36e9 RD |
4533 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
4534 | -- of a subprogram or entry declaration. | |
406935b6 AC |
4535 | |
4536 | elsif Ekind (T) = E_Incomplete_Type | |
4537 | and then Ada_Version >= Ada_2012 | |
4538 | then | |
4539 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 4540 | end if; |
4a13695c | 4541 | |
996ae0b0 RK |
4542 | end Possible_Freeze; |
4543 | ||
4544 | -- Start of processing for Check_Delayed_Subprogram | |
4545 | ||
4546 | begin | |
76e3504f AC |
4547 | -- All subprograms, including abstract subprograms, may need a freeze |
4548 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 4549 | |
76e3504f AC |
4550 | Possible_Freeze (Etype (Designator)); |
4551 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 4552 | |
76e3504f AC |
4553 | -- Need delayed freeze if any of the formal types themselves need |
4554 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 4555 | |
76e3504f AC |
4556 | F := First_Formal (Designator); |
4557 | while Present (F) loop | |
4558 | Possible_Freeze (Etype (F)); | |
4559 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
4560 | Next_Formal (F); | |
4561 | end loop; | |
996ae0b0 RK |
4562 | |
4563 | -- Mark functions that return by reference. Note that it cannot be | |
4564 | -- done for delayed_freeze subprograms because the underlying | |
4565 | -- returned type may not be known yet (for private types) | |
4566 | ||
4567 | if not Has_Delayed_Freeze (Designator) | |
4568 | and then Expander_Active | |
4569 | then | |
4570 | declare | |
4571 | Typ : constant Entity_Id := Etype (Designator); | |
4572 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
9694c039 | 4573 | |
996ae0b0 | 4574 | begin |
40f07b4b | 4575 | if Is_Immutably_Limited_Type (Typ) then |
996ae0b0 | 4576 | Set_Returns_By_Ref (Designator); |
9694c039 | 4577 | |
048e5cef | 4578 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
4579 | Set_Returns_By_Ref (Designator); |
4580 | end if; | |
4581 | end; | |
4582 | end if; | |
4583 | end Check_Delayed_Subprogram; | |
4584 | ||
4585 | ------------------------------------ | |
4586 | -- Check_Discriminant_Conformance -- | |
4587 | ------------------------------------ | |
4588 | ||
4589 | procedure Check_Discriminant_Conformance | |
4590 | (N : Node_Id; | |
4591 | Prev : Entity_Id; | |
4592 | Prev_Loc : Node_Id) | |
4593 | is | |
4594 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
4595 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
4596 | New_Discr_Id : Entity_Id; | |
4597 | New_Discr_Type : Entity_Id; | |
4598 | ||
4599 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
4600 | -- Post error message for conformance error on given node. Two messages |
4601 | -- are output. The first points to the previous declaration with a | |
4602 | -- general "no conformance" message. The second is the detailed reason, | |
4603 | -- supplied as Msg. The parameter N provide information for a possible | |
4604 | -- & insertion in the message. | |
996ae0b0 RK |
4605 | |
4606 | ----------------------- | |
4607 | -- Conformance_Error -- | |
4608 | ----------------------- | |
4609 | ||
4610 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
4611 | begin | |
4612 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
4613 | Error_Msg_N -- CODEFIX |
4614 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
4615 | Error_Msg_NE (Msg, N, N); |
4616 | end Conformance_Error; | |
4617 | ||
4618 | -- Start of processing for Check_Discriminant_Conformance | |
4619 | ||
4620 | begin | |
4621 | while Present (Old_Discr) and then Present (New_Discr) loop | |
4622 | ||
4623 | New_Discr_Id := Defining_Identifier (New_Discr); | |
4624 | ||
82c80734 RD |
4625 | -- The subtype mark of the discriminant on the full type has not |
4626 | -- been analyzed so we do it here. For an access discriminant a new | |
4627 | -- type is created. | |
996ae0b0 RK |
4628 | |
4629 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
4630 | New_Discr_Type := | |
4631 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
4632 | ||
4633 | else | |
4634 | Analyze (Discriminant_Type (New_Discr)); | |
4635 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
4636 | |
4637 | -- Ada 2005: if the discriminant definition carries a null | |
4638 | -- exclusion, create an itype to check properly for consistency | |
4639 | -- with partial declaration. | |
4640 | ||
4641 | if Is_Access_Type (New_Discr_Type) | |
4642 | and then Null_Exclusion_Present (New_Discr) | |
4643 | then | |
4644 | New_Discr_Type := | |
4645 | Create_Null_Excluding_Itype | |
4646 | (T => New_Discr_Type, | |
4647 | Related_Nod => New_Discr, | |
4648 | Scope_Id => Current_Scope); | |
4649 | end if; | |
996ae0b0 RK |
4650 | end if; |
4651 | ||
4652 | if not Conforming_Types | |
4653 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
4654 | then | |
4655 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
4656 | return; | |
fbf5a39b | 4657 | else |
82c80734 RD |
4658 | -- Treat the new discriminant as an occurrence of the old one, |
4659 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
4660 | -- information, for completeness. |
4661 | ||
4662 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
4663 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
4664 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
4665 | end if; |
4666 | ||
4667 | -- Names must match | |
4668 | ||
4669 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
4670 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
4671 | return; | |
4672 | end if; | |
4673 | ||
4674 | -- Default expressions must match | |
4675 | ||
4676 | declare | |
4677 | NewD : constant Boolean := | |
4678 | Present (Expression (New_Discr)); | |
4679 | OldD : constant Boolean := | |
4680 | Present (Expression (Parent (Old_Discr))); | |
4681 | ||
4682 | begin | |
4683 | if NewD or OldD then | |
4684 | ||
4685 | -- The old default value has been analyzed and expanded, | |
4686 | -- because the current full declaration will have frozen | |
82c80734 RD |
4687 | -- everything before. The new default values have not been |
4688 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
4689 | |
4690 | if NewD then | |
21d27997 | 4691 | Preanalyze_Spec_Expression |
996ae0b0 RK |
4692 | (Expression (New_Discr), New_Discr_Type); |
4693 | end if; | |
4694 | ||
4695 | if not (NewD and OldD) | |
4696 | or else not Fully_Conformant_Expressions | |
4697 | (Expression (Parent (Old_Discr)), | |
4698 | Expression (New_Discr)) | |
4699 | ||
4700 | then | |
4701 | Conformance_Error | |
4702 | ("default expression for & does not match!", | |
4703 | New_Discr_Id); | |
4704 | return; | |
4705 | end if; | |
4706 | end if; | |
4707 | end; | |
4708 | ||
4709 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
4710 | ||
0ab80019 | 4711 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
4712 | declare |
4713 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
4714 | ||
4715 | begin | |
4716 | -- Grouping (use of comma in param lists) must be the same | |
4717 | -- This is where we catch a misconformance like: | |
4718 | ||
4719 | -- A,B : Integer | |
4720 | -- A : Integer; B : Integer | |
4721 | ||
4722 | -- which are represented identically in the tree except | |
4723 | -- for the setting of the flags More_Ids and Prev_Ids. | |
4724 | ||
4725 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
4726 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
4727 | then | |
4728 | Conformance_Error | |
4729 | ("grouping of & does not match!", New_Discr_Id); | |
4730 | return; | |
4731 | end if; | |
4732 | end; | |
4733 | end if; | |
4734 | ||
4735 | Next_Discriminant (Old_Discr); | |
4736 | Next (New_Discr); | |
4737 | end loop; | |
4738 | ||
4739 | if Present (Old_Discr) then | |
4740 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
4741 | return; | |
4742 | ||
4743 | elsif Present (New_Discr) then | |
4744 | Conformance_Error | |
4745 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
4746 | return; | |
4747 | end if; | |
4748 | end Check_Discriminant_Conformance; | |
4749 | ||
4750 | ---------------------------- | |
4751 | -- Check_Fully_Conformant -- | |
4752 | ---------------------------- | |
4753 | ||
4754 | procedure Check_Fully_Conformant | |
4755 | (New_Id : Entity_Id; | |
4756 | Old_Id : Entity_Id; | |
4757 | Err_Loc : Node_Id := Empty) | |
4758 | is | |
4759 | Result : Boolean; | |
81db9d77 | 4760 | pragma Warnings (Off, Result); |
996ae0b0 RK |
4761 | begin |
4762 | Check_Conformance | |
4763 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
4764 | end Check_Fully_Conformant; | |
4765 | ||
4766 | --------------------------- | |
4767 | -- Check_Mode_Conformant -- | |
4768 | --------------------------- | |
4769 | ||
4770 | procedure Check_Mode_Conformant | |
4771 | (New_Id : Entity_Id; | |
4772 | Old_Id : Entity_Id; | |
4773 | Err_Loc : Node_Id := Empty; | |
4774 | Get_Inst : Boolean := False) | |
4775 | is | |
4776 | Result : Boolean; | |
81db9d77 | 4777 | pragma Warnings (Off, Result); |
996ae0b0 RK |
4778 | begin |
4779 | Check_Conformance | |
4780 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
4781 | end Check_Mode_Conformant; | |
4782 | ||
fbf5a39b | 4783 | -------------------------------- |
758c442c | 4784 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
4785 | -------------------------------- |
4786 | ||
758c442c | 4787 | procedure Check_Overriding_Indicator |
ec4867fa | 4788 | (Subp : Entity_Id; |
5d37ba92 ES |
4789 | Overridden_Subp : Entity_Id; |
4790 | Is_Primitive : Boolean) | |
fbf5a39b | 4791 | is |
758c442c GD |
4792 | Decl : Node_Id; |
4793 | Spec : Node_Id; | |
fbf5a39b AC |
4794 | |
4795 | begin | |
ec4867fa | 4796 | -- No overriding indicator for literals |
fbf5a39b | 4797 | |
ec4867fa | 4798 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 4799 | return; |
fbf5a39b | 4800 | |
ec4867fa ES |
4801 | elsif Ekind (Subp) = E_Entry then |
4802 | Decl := Parent (Subp); | |
4803 | ||
53b10ce9 AC |
4804 | -- No point in analyzing a malformed operator |
4805 | ||
4806 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
4807 | and then Error_Posted (Subp) | |
4808 | then | |
4809 | return; | |
4810 | ||
758c442c GD |
4811 | else |
4812 | Decl := Unit_Declaration_Node (Subp); | |
4813 | end if; | |
fbf5a39b | 4814 | |
800621e0 RD |
4815 | if Nkind_In (Decl, N_Subprogram_Body, |
4816 | N_Subprogram_Body_Stub, | |
4817 | N_Subprogram_Declaration, | |
4818 | N_Abstract_Subprogram_Declaration, | |
4819 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
4820 | then |
4821 | Spec := Specification (Decl); | |
ec4867fa ES |
4822 | |
4823 | elsif Nkind (Decl) = N_Entry_Declaration then | |
4824 | Spec := Decl; | |
4825 | ||
758c442c GD |
4826 | else |
4827 | return; | |
4828 | end if; | |
fbf5a39b | 4829 | |
e7d72fb9 AC |
4830 | -- The overriding operation is type conformant with the overridden one, |
4831 | -- but the names of the formals are not required to match. If the names | |
6823270c | 4832 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
4833 | -- source of confusion that is worth diagnosing. Controlling formals |
4834 | -- often carry names that reflect the type, and it is not worthwhile | |
4835 | -- requiring that their names match. | |
4836 | ||
c9e7bd8e | 4837 | if Present (Overridden_Subp) |
e7d72fb9 AC |
4838 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
4839 | then | |
4840 | declare | |
4841 | Form1 : Entity_Id; | |
4842 | Form2 : Entity_Id; | |
4843 | ||
4844 | begin | |
4845 | Form1 := First_Formal (Subp); | |
4846 | Form2 := First_Formal (Overridden_Subp); | |
4847 | ||
c9e7bd8e AC |
4848 | -- If the overriding operation is a synchronized operation, skip |
4849 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
4850 | -- implicit in the new one. If the operation is declared in the |
4851 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 4852 | |
6823270c AC |
4853 | if Is_Concurrent_Type (Scope (Subp)) |
4854 | and then Is_Tagged_Type (Scope (Subp)) | |
4855 | and then not Has_Completion (Scope (Subp)) | |
4856 | then | |
c9e7bd8e AC |
4857 | Form2 := Next_Formal (Form2); |
4858 | end if; | |
4859 | ||
e7d72fb9 AC |
4860 | if Present (Form1) then |
4861 | Form1 := Next_Formal (Form1); | |
4862 | Form2 := Next_Formal (Form2); | |
4863 | end if; | |
4864 | ||
4865 | while Present (Form1) loop | |
4866 | if not Is_Controlling_Formal (Form1) | |
4867 | and then Present (Next_Formal (Form2)) | |
4868 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
4869 | then | |
4870 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
4871 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 4872 | Error_Msg_NE |
19d846a0 | 4873 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
4874 | Form1, Form1); |
4875 | exit; | |
4876 | end if; | |
4877 | ||
4878 | Next_Formal (Form1); | |
4879 | Next_Formal (Form2); | |
4880 | end loop; | |
4881 | end; | |
4882 | end if; | |
4883 | ||
676e8420 AC |
4884 | -- If there is an overridden subprogram, then check that there is no |
4885 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
4886 | -- This is not done if the overridden subprogram is marked as hidden, |
4887 | -- which can occur for the case of inherited controlled operations | |
4888 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
4889 | -- subprogram is not itself hidden. (Note: This condition could probably | |
4890 | -- be simplified, leaving out the testing for the specific controlled | |
4891 | -- cases, but it seems safer and clearer this way, and echoes similar | |
4892 | -- special-case tests of this kind in other places.) | |
4893 | ||
fd0d899b | 4894 | if Present (Overridden_Subp) |
51bf9bdf AC |
4895 | and then (not Is_Hidden (Overridden_Subp) |
4896 | or else | |
4897 | ((Chars (Overridden_Subp) = Name_Initialize | |
f0709ca6 AC |
4898 | or else |
4899 | Chars (Overridden_Subp) = Name_Adjust | |
4900 | or else | |
4901 | Chars (Overridden_Subp) = Name_Finalize) | |
4902 | and then Present (Alias (Overridden_Subp)) | |
4903 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 4904 | then |
ec4867fa ES |
4905 | if Must_Not_Override (Spec) then |
4906 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 4907 | |
ec4867fa | 4908 | if Ekind (Subp) = E_Entry then |
ed2233dc | 4909 | Error_Msg_NE |
5d37ba92 | 4910 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 4911 | else |
ed2233dc | 4912 | Error_Msg_NE |
5d37ba92 | 4913 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 4914 | end if; |
21d27997 RD |
4915 | |
4916 | elsif Is_Subprogram (Subp) then | |
2fe829ae ES |
4917 | if Is_Init_Proc (Subp) then |
4918 | null; | |
4919 | ||
4920 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
4921 | |
4922 | -- For entities generated by Derive_Subprograms the overridden | |
4923 | -- operation is the inherited primitive (which is available | |
4924 | -- through the attribute alias) | |
4925 | ||
4926 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 4927 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 4928 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
4929 | and then Find_Dispatching_Type (Overridden_Subp) = |
4930 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
4931 | and then Present (Alias (Overridden_Subp)) |
4932 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
4933 | then | |
4934 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 4935 | |
1c1289e7 AC |
4936 | else |
4937 | Set_Overridden_Operation (Subp, Overridden_Subp); | |
4938 | end if; | |
4939 | end if; | |
ec4867fa | 4940 | end if; |
f937473f | 4941 | |
618fb570 AC |
4942 | -- If primitive flag is set or this is a protected operation, then |
4943 | -- the operation is overriding at the point of its declaration, so | |
4944 | -- warn if necessary. Otherwise it may have been declared before the | |
4945 | -- operation it overrides and no check is required. | |
3c25856a AC |
4946 | |
4947 | if Style_Check | |
618fb570 AC |
4948 | and then not Must_Override (Spec) |
4949 | and then (Is_Primitive | |
4950 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 4951 | then |
235f4375 AC |
4952 | Style.Missing_Overriding (Decl, Subp); |
4953 | end if; | |
4954 | ||
53b10ce9 AC |
4955 | -- If Subp is an operator, it may override a predefined operation, if |
4956 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 4957 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
4958 | -- representation for predefined operators. We have to check whether the |
4959 | -- signature of Subp matches that of a predefined operator. Note that | |
4960 | -- first argument provides the name of the operator, and the second | |
4961 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
4962 | -- If the indicator is overriding, then the operator must match a |
4963 | -- predefined signature, because we know already that there is no | |
4964 | -- explicit overridden operation. | |
f937473f | 4965 | |
21d27997 | 4966 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 4967 | if Must_Not_Override (Spec) then |
f937473f | 4968 | |
806f6d37 AC |
4969 | -- If this is not a primitive or a protected subprogram, then |
4970 | -- "not overriding" is illegal. | |
618fb570 | 4971 | |
806f6d37 AC |
4972 | if not Is_Primitive |
4973 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
4974 | then | |
4975 | Error_Msg_N | |
4976 | ("overriding indicator only allowed " | |
4977 | & "if subprogram is primitive", Subp); | |
618fb570 | 4978 | |
806f6d37 AC |
4979 | elsif Can_Override_Operator (Subp) then |
4980 | Error_Msg_NE | |
4981 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
4982 | end if; | |
f937473f | 4983 | |
806f6d37 AC |
4984 | elsif Must_Override (Spec) then |
4985 | if No (Overridden_Operation (Subp)) | |
4986 | and then not Can_Override_Operator (Subp) | |
4987 | then | |
4988 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
4989 | end if; | |
5d37ba92 | 4990 | |
806f6d37 AC |
4991 | elsif not Error_Posted (Subp) |
4992 | and then Style_Check | |
4993 | and then Can_Override_Operator (Subp) | |
4994 | and then | |
4995 | not Is_Predefined_File_Name | |
4996 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
4997 | then | |
4998 | -- If style checks are enabled, indicate that the indicator is | |
4999 | -- missing. However, at the point of declaration, the type of | |
5000 | -- which this is a primitive operation may be private, in which | |
5001 | -- case the indicator would be premature. | |
235f4375 | 5002 | |
806f6d37 AC |
5003 | if Has_Private_Declaration (Etype (Subp)) |
5004 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 5005 | then |
806f6d37 AC |
5006 | null; |
5007 | else | |
5008 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 5009 | end if; |
806f6d37 | 5010 | end if; |
21d27997 RD |
5011 | |
5012 | elsif Must_Override (Spec) then | |
5013 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 5014 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 5015 | else |
ed2233dc | 5016 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 5017 | end if; |
5d37ba92 ES |
5018 | |
5019 | -- If the operation is marked "not overriding" and it's not primitive | |
5020 | -- then an error is issued, unless this is an operation of a task or | |
5021 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
5022 | -- has been specified have already been checked above. | |
5023 | ||
5024 | elsif Must_Not_Override (Spec) | |
5025 | and then not Is_Primitive | |
5026 | and then Ekind (Subp) /= E_Entry | |
5027 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5028 | then | |
ed2233dc | 5029 | Error_Msg_N |
5d37ba92 ES |
5030 | ("overriding indicator only allowed if subprogram is primitive", |
5031 | Subp); | |
5d37ba92 | 5032 | return; |
fbf5a39b | 5033 | end if; |
758c442c | 5034 | end Check_Overriding_Indicator; |
fbf5a39b | 5035 | |
996ae0b0 RK |
5036 | ------------------- |
5037 | -- Check_Returns -- | |
5038 | ------------------- | |
5039 | ||
0a36105d JM |
5040 | -- Note: this procedure needs to know far too much about how the expander |
5041 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
5042 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
5043 | -- works, but is not very clean. It would be better if the expansion | |
5044 | -- routines would leave Original_Node working nicely, and we could use | |
5045 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
5046 | ||
996ae0b0 RK |
5047 | procedure Check_Returns |
5048 | (HSS : Node_Id; | |
5049 | Mode : Character; | |
c8ef728f ES |
5050 | Err : out Boolean; |
5051 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
5052 | is |
5053 | Handler : Node_Id; | |
5054 | ||
5055 | procedure Check_Statement_Sequence (L : List_Id); | |
5056 | -- Internal recursive procedure to check a list of statements for proper | |
5057 | -- termination by a return statement (or a transfer of control or a | |
5058 | -- compound statement that is itself internally properly terminated). | |
5059 | ||
5060 | ------------------------------ | |
5061 | -- Check_Statement_Sequence -- | |
5062 | ------------------------------ | |
5063 | ||
5064 | procedure Check_Statement_Sequence (L : List_Id) is | |
5065 | Last_Stm : Node_Id; | |
0a36105d | 5066 | Stm : Node_Id; |
996ae0b0 RK |
5067 | Kind : Node_Kind; |
5068 | ||
5069 | Raise_Exception_Call : Boolean; | |
5070 | -- Set True if statement sequence terminated by Raise_Exception call | |
5071 | -- or a Reraise_Occurrence call. | |
5072 | ||
5073 | begin | |
5074 | Raise_Exception_Call := False; | |
5075 | ||
5076 | -- Get last real statement | |
5077 | ||
5078 | Last_Stm := Last (L); | |
5079 | ||
0a36105d JM |
5080 | -- Deal with digging out exception handler statement sequences that |
5081 | -- have been transformed by the local raise to goto optimization. | |
5082 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
5083 | -- optimization has occurred, we are looking at something like: | |
5084 | ||
5085 | -- begin | |
5086 | -- original stmts in block | |
5087 | ||
5088 | -- exception \ | |
5089 | -- when excep1 => | | |
5090 | -- goto L1; | omitted if No_Exception_Propagation | |
5091 | -- when excep2 => | | |
5092 | -- goto L2; / | |
5093 | -- end; | |
5094 | ||
5095 | -- goto L3; -- skip handler when exception not raised | |
5096 | ||
5097 | -- <<L1>> -- target label for local exception | |
5098 | -- begin | |
5099 | -- estmts1 | |
5100 | -- end; | |
5101 | ||
5102 | -- goto L3; | |
5103 | ||
5104 | -- <<L2>> | |
5105 | -- begin | |
5106 | -- estmts2 | |
5107 | -- end; | |
5108 | ||
5109 | -- <<L3>> | |
5110 | ||
5111 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
5112 | -- sequences (which were the original sequences of statements in | |
5113 | -- the exception handlers) and check them. | |
5114 | ||
5115 | if Nkind (Last_Stm) = N_Label | |
5116 | and then Exception_Junk (Last_Stm) | |
5117 | then | |
5118 | Stm := Last_Stm; | |
5119 | loop | |
5120 | Prev (Stm); | |
5121 | exit when No (Stm); | |
5122 | exit when Nkind (Stm) /= N_Block_Statement; | |
5123 | exit when not Exception_Junk (Stm); | |
5124 | Prev (Stm); | |
5125 | exit when No (Stm); | |
5126 | exit when Nkind (Stm) /= N_Label; | |
5127 | exit when not Exception_Junk (Stm); | |
5128 | Check_Statement_Sequence | |
5129 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
5130 | ||
5131 | Prev (Stm); | |
5132 | Last_Stm := Stm; | |
5133 | exit when No (Stm); | |
5134 | exit when Nkind (Stm) /= N_Goto_Statement; | |
5135 | exit when not Exception_Junk (Stm); | |
5136 | end loop; | |
5137 | end if; | |
5138 | ||
996ae0b0 RK |
5139 | -- Don't count pragmas |
5140 | ||
5141 | while Nkind (Last_Stm) = N_Pragma | |
5142 | ||
5143 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
5144 | ||
5145 | or else | |
5146 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
5147 | and then | |
5148 | Nkind (Name (Last_Stm)) = N_Identifier | |
5149 | and then | |
5150 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
5151 | ||
5152 | -- Don't count exception junk | |
5153 | ||
5154 | or else | |
800621e0 RD |
5155 | (Nkind_In (Last_Stm, N_Goto_Statement, |
5156 | N_Label, | |
5157 | N_Object_Declaration) | |
0a36105d JM |
5158 | and then Exception_Junk (Last_Stm)) |
5159 | or else Nkind (Last_Stm) in N_Push_xxx_Label | |
5160 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
996ae0b0 RK |
5161 | loop |
5162 | Prev (Last_Stm); | |
5163 | end loop; | |
5164 | ||
5165 | -- Here we have the "real" last statement | |
5166 | ||
5167 | Kind := Nkind (Last_Stm); | |
5168 | ||
5169 | -- Transfer of control, OK. Note that in the No_Return procedure | |
5170 | -- case, we already diagnosed any explicit return statements, so | |
5171 | -- we can treat them as OK in this context. | |
5172 | ||
5173 | if Is_Transfer (Last_Stm) then | |
5174 | return; | |
5175 | ||
5176 | -- Check cases of explicit non-indirect procedure calls | |
5177 | ||
5178 | elsif Kind = N_Procedure_Call_Statement | |
5179 | and then Is_Entity_Name (Name (Last_Stm)) | |
5180 | then | |
5181 | -- Check call to Raise_Exception procedure which is treated | |
5182 | -- specially, as is a call to Reraise_Occurrence. | |
5183 | ||
5184 | -- We suppress the warning in these cases since it is likely that | |
5185 | -- the programmer really does not expect to deal with the case | |
5186 | -- of Null_Occurrence, and thus would find a warning about a | |
5187 | -- missing return curious, and raising Program_Error does not | |
5188 | -- seem such a bad behavior if this does occur. | |
5189 | ||
c8ef728f ES |
5190 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
5191 | -- behavior will be to raise Constraint_Error (see AI-329). | |
5192 | ||
996ae0b0 RK |
5193 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
5194 | or else | |
5195 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
5196 | then | |
5197 | Raise_Exception_Call := True; | |
5198 | ||
5199 | -- For Raise_Exception call, test first argument, if it is | |
5200 | -- an attribute reference for a 'Identity call, then we know | |
5201 | -- that the call cannot possibly return. | |
5202 | ||
5203 | declare | |
5204 | Arg : constant Node_Id := | |
5205 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
5206 | begin |
5207 | if Nkind (Arg) = N_Attribute_Reference | |
5208 | and then Attribute_Name (Arg) = Name_Identity | |
5209 | then | |
5210 | return; | |
5211 | end if; | |
5212 | end; | |
5213 | end if; | |
5214 | ||
5215 | -- If statement, need to look inside if there is an else and check | |
5216 | -- each constituent statement sequence for proper termination. | |
5217 | ||
5218 | elsif Kind = N_If_Statement | |
5219 | and then Present (Else_Statements (Last_Stm)) | |
5220 | then | |
5221 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
5222 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
5223 | ||
5224 | if Present (Elsif_Parts (Last_Stm)) then | |
5225 | declare | |
5226 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
5227 | ||
5228 | begin | |
5229 | while Present (Elsif_Part) loop | |
5230 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
5231 | Next (Elsif_Part); | |
5232 | end loop; | |
5233 | end; | |
5234 | end if; | |
5235 | ||
5236 | return; | |
5237 | ||
5238 | -- Case statement, check each case for proper termination | |
5239 | ||
5240 | elsif Kind = N_Case_Statement then | |
5241 | declare | |
5242 | Case_Alt : Node_Id; | |
996ae0b0 RK |
5243 | begin |
5244 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
5245 | while Present (Case_Alt) loop | |
5246 | Check_Statement_Sequence (Statements (Case_Alt)); | |
5247 | Next_Non_Pragma (Case_Alt); | |
5248 | end loop; | |
5249 | end; | |
5250 | ||
5251 | return; | |
5252 | ||
5253 | -- Block statement, check its handled sequence of statements | |
5254 | ||
5255 | elsif Kind = N_Block_Statement then | |
5256 | declare | |
5257 | Err1 : Boolean; | |
5258 | ||
5259 | begin | |
5260 | Check_Returns | |
5261 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
5262 | ||
5263 | if Err1 then | |
5264 | Err := True; | |
5265 | end if; | |
5266 | ||
5267 | return; | |
5268 | end; | |
5269 | ||
5270 | -- Loop statement. If there is an iteration scheme, we can definitely | |
5271 | -- fall out of the loop. Similarly if there is an exit statement, we | |
5272 | -- can fall out. In either case we need a following return. | |
5273 | ||
5274 | elsif Kind = N_Loop_Statement then | |
5275 | if Present (Iteration_Scheme (Last_Stm)) | |
5276 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
5277 | then | |
5278 | null; | |
5279 | ||
f3d57416 RW |
5280 | -- A loop with no exit statement or iteration scheme is either |
5281 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
5282 | -- In either case, no warning is required. |
5283 | ||
5284 | else | |
5285 | return; | |
5286 | end if; | |
5287 | ||
5288 | -- Timed entry call, check entry call and delay alternatives | |
5289 | ||
5290 | -- Note: in expanded code, the timed entry call has been converted | |
5291 | -- to a set of expanded statements on which the check will work | |
5292 | -- correctly in any case. | |
5293 | ||
5294 | elsif Kind = N_Timed_Entry_Call then | |
5295 | declare | |
5296 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
5297 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
5298 | ||
5299 | begin | |
5300 | -- If statement sequence of entry call alternative is missing, | |
5301 | -- then we can definitely fall through, and we post the error | |
5302 | -- message on the entry call alternative itself. | |
5303 | ||
5304 | if No (Statements (ECA)) then | |
5305 | Last_Stm := ECA; | |
5306 | ||
5307 | -- If statement sequence of delay alternative is missing, then | |
5308 | -- we can definitely fall through, and we post the error | |
5309 | -- message on the delay alternative itself. | |
5310 | ||
5311 | -- Note: if both ECA and DCA are missing the return, then we | |
5312 | -- post only one message, should be enough to fix the bugs. | |
5313 | -- If not we will get a message next time on the DCA when the | |
5314 | -- ECA is fixed! | |
5315 | ||
5316 | elsif No (Statements (DCA)) then | |
5317 | Last_Stm := DCA; | |
5318 | ||
5319 | -- Else check both statement sequences | |
5320 | ||
5321 | else | |
5322 | Check_Statement_Sequence (Statements (ECA)); | |
5323 | Check_Statement_Sequence (Statements (DCA)); | |
5324 | return; | |
5325 | end if; | |
5326 | end; | |
5327 | ||
5328 | -- Conditional entry call, check entry call and else part | |
5329 | ||
5330 | -- Note: in expanded code, the conditional entry call has been | |
5331 | -- converted to a set of expanded statements on which the check | |
5332 | -- will work correctly in any case. | |
5333 | ||
5334 | elsif Kind = N_Conditional_Entry_Call then | |
5335 | declare | |
5336 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
5337 | ||
5338 | begin | |
5339 | -- If statement sequence of entry call alternative is missing, | |
5340 | -- then we can definitely fall through, and we post the error | |
5341 | -- message on the entry call alternative itself. | |
5342 | ||
5343 | if No (Statements (ECA)) then | |
5344 | Last_Stm := ECA; | |
5345 | ||
5346 | -- Else check statement sequence and else part | |
5347 | ||
5348 | else | |
5349 | Check_Statement_Sequence (Statements (ECA)); | |
5350 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
5351 | return; | |
5352 | end if; | |
5353 | end; | |
5354 | end if; | |
5355 | ||
5356 | -- If we fall through, issue appropriate message | |
5357 | ||
5358 | if Mode = 'F' then | |
996ae0b0 RK |
5359 | if not Raise_Exception_Call then |
5360 | Error_Msg_N | |
5d37ba92 | 5361 | ("?RETURN statement missing following this statement!", |
996ae0b0 RK |
5362 | Last_Stm); |
5363 | Error_Msg_N | |
5d37ba92 | 5364 | ("\?Program_Error may be raised at run time!", |
996ae0b0 RK |
5365 | Last_Stm); |
5366 | end if; | |
5367 | ||
5368 | -- Note: we set Err even though we have not issued a warning | |
5369 | -- because we still have a case of a missing return. This is | |
5370 | -- an extremely marginal case, probably will never be noticed | |
5371 | -- but we might as well get it right. | |
5372 | ||
5373 | Err := True; | |
5374 | ||
c8ef728f ES |
5375 | -- Otherwise we have the case of a procedure marked No_Return |
5376 | ||
996ae0b0 | 5377 | else |
800621e0 RD |
5378 | if not Raise_Exception_Call then |
5379 | Error_Msg_N | |
5380 | ("?implied return after this statement " & | |
5381 | "will raise Program_Error", | |
5382 | Last_Stm); | |
5383 | Error_Msg_NE | |
5384 | ("\?procedure & is marked as No_Return!", | |
5385 | Last_Stm, Proc); | |
5386 | end if; | |
c8ef728f ES |
5387 | |
5388 | declare | |
5389 | RE : constant Node_Id := | |
5390 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
5391 | Reason => PE_Implicit_Return); | |
5392 | begin | |
5393 | Insert_After (Last_Stm, RE); | |
5394 | Analyze (RE); | |
5395 | end; | |
996ae0b0 RK |
5396 | end if; |
5397 | end Check_Statement_Sequence; | |
5398 | ||
5399 | -- Start of processing for Check_Returns | |
5400 | ||
5401 | begin | |
5402 | Err := False; | |
5403 | Check_Statement_Sequence (Statements (HSS)); | |
5404 | ||
5405 | if Present (Exception_Handlers (HSS)) then | |
5406 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
5407 | while Present (Handler) loop | |
5408 | Check_Statement_Sequence (Statements (Handler)); | |
5409 | Next_Non_Pragma (Handler); | |
5410 | end loop; | |
5411 | end if; | |
5412 | end Check_Returns; | |
5413 | ||
5414 | ---------------------------- | |
5415 | -- Check_Subprogram_Order -- | |
5416 | ---------------------------- | |
5417 | ||
5418 | procedure Check_Subprogram_Order (N : Node_Id) is | |
5419 | ||
5420 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
5421 | -- This is used to check if S1 > S2 in the sense required by this | |
5422 | -- test, for example nameab < namec, but name2 < name10. | |
5423 | ||
82c80734 RD |
5424 | ----------------------------- |
5425 | -- Subprogram_Name_Greater -- | |
5426 | ----------------------------- | |
5427 | ||
996ae0b0 RK |
5428 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
5429 | L1, L2 : Positive; | |
5430 | N1, N2 : Natural; | |
5431 | ||
5432 | begin | |
5433 | -- Remove trailing numeric parts | |
5434 | ||
5435 | L1 := S1'Last; | |
5436 | while S1 (L1) in '0' .. '9' loop | |
5437 | L1 := L1 - 1; | |
5438 | end loop; | |
5439 | ||
5440 | L2 := S2'Last; | |
5441 | while S2 (L2) in '0' .. '9' loop | |
5442 | L2 := L2 - 1; | |
5443 | end loop; | |
5444 | ||
5445 | -- If non-numeric parts non-equal, that's decisive | |
5446 | ||
5447 | if S1 (S1'First .. L1) < S2 (S2'First .. L2) then | |
5448 | return False; | |
5449 | ||
5450 | elsif S1 (S1'First .. L1) > S2 (S2'First .. L2) then | |
5451 | return True; | |
5452 | ||
5453 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
5454 | -- that a missing suffix is treated as numeric zero in this test. | |
5455 | ||
5456 | else | |
5457 | N1 := 0; | |
5458 | while L1 < S1'Last loop | |
5459 | L1 := L1 + 1; | |
5460 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
5461 | end loop; | |
5462 | ||
5463 | N2 := 0; | |
5464 | while L2 < S2'Last loop | |
5465 | L2 := L2 + 1; | |
5466 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
5467 | end loop; | |
5468 | ||
5469 | return N1 > N2; | |
5470 | end if; | |
5471 | end Subprogram_Name_Greater; | |
5472 | ||
5473 | -- Start of processing for Check_Subprogram_Order | |
5474 | ||
5475 | begin | |
5476 | -- Check body in alpha order if this is option | |
5477 | ||
fbf5a39b | 5478 | if Style_Check |
bc202b70 | 5479 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
5480 | and then Nkind (N) = N_Subprogram_Body |
5481 | and then Comes_From_Source (N) | |
5482 | and then In_Extended_Main_Source_Unit (N) | |
5483 | then | |
5484 | declare | |
5485 | LSN : String_Ptr | |
5486 | renames Scope_Stack.Table | |
5487 | (Scope_Stack.Last).Last_Subprogram_Name; | |
5488 | ||
5489 | Body_Id : constant Entity_Id := | |
5490 | Defining_Entity (Specification (N)); | |
5491 | ||
5492 | begin | |
5493 | Get_Decoded_Name_String (Chars (Body_Id)); | |
5494 | ||
5495 | if LSN /= null then | |
5496 | if Subprogram_Name_Greater | |
5497 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
5498 | then | |
5499 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
5500 | end if; | |
5501 | ||
5502 | Free (LSN); | |
5503 | end if; | |
5504 | ||
5505 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
5506 | end; | |
5507 | end if; | |
5508 | end Check_Subprogram_Order; | |
5509 | ||
5510 | ------------------------------ | |
5511 | -- Check_Subtype_Conformant -- | |
5512 | ------------------------------ | |
5513 | ||
5514 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
5515 | (New_Id : Entity_Id; |
5516 | Old_Id : Entity_Id; | |
5517 | Err_Loc : Node_Id := Empty; | |
5518 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 RK |
5519 | is |
5520 | Result : Boolean; | |
81db9d77 | 5521 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5522 | begin |
5523 | Check_Conformance | |
ce2b6ba5 JM |
5524 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
5525 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
5526 | end Check_Subtype_Conformant; |
5527 | ||
5528 | --------------------------- | |
5529 | -- Check_Type_Conformant -- | |
5530 | --------------------------- | |
5531 | ||
5532 | procedure Check_Type_Conformant | |
5533 | (New_Id : Entity_Id; | |
5534 | Old_Id : Entity_Id; | |
5535 | Err_Loc : Node_Id := Empty) | |
5536 | is | |
5537 | Result : Boolean; | |
81db9d77 | 5538 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5539 | begin |
5540 | Check_Conformance | |
5541 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
5542 | end Check_Type_Conformant; | |
5543 | ||
806f6d37 AC |
5544 | --------------------------- |
5545 | -- Can_Override_Operator -- | |
5546 | --------------------------- | |
5547 | ||
5548 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
5549 | Typ : Entity_Id; | |
5550 | begin | |
5551 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
5552 | return False; | |
5553 | ||
5554 | else | |
5555 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
5556 | ||
5557 | return Operator_Matches_Spec (Subp, Subp) | |
5558 | and then Scope (Subp) = Scope (Typ) | |
5559 | and then not Is_Class_Wide_Type (Typ); | |
5560 | end if; | |
5561 | end Can_Override_Operator; | |
5562 | ||
996ae0b0 RK |
5563 | ---------------------- |
5564 | -- Conforming_Types -- | |
5565 | ---------------------- | |
5566 | ||
5567 | function Conforming_Types | |
5568 | (T1 : Entity_Id; | |
5569 | T2 : Entity_Id; | |
5570 | Ctype : Conformance_Type; | |
d05ef0ab | 5571 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
5572 | is |
5573 | Type_1 : Entity_Id := T1; | |
5574 | Type_2 : Entity_Id := T2; | |
af4b9434 | 5575 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
5576 | |
5577 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
5578 | -- If neither T1 nor T2 are generic actual types, or if they are in |
5579 | -- different scopes (e.g. parent and child instances), then verify that | |
5580 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
5581 | -- subtype chain. The whole purpose of this procedure is to prevent | |
5582 | -- spurious ambiguities in an instantiation that may arise if two | |
5583 | -- distinct generic types are instantiated with the same actual. | |
5584 | ||
5d37ba92 ES |
5585 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
5586 | -- An access parameter can designate an incomplete type. If the | |
5587 | -- incomplete type is the limited view of a type from a limited_ | |
5588 | -- with_clause, check whether the non-limited view is available. If | |
5589 | -- it is a (non-limited) incomplete type, get the full view. | |
5590 | ||
0a36105d JM |
5591 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
5592 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
5593 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
5594 | -- with view of a type is used in a subprogram declaration and the | |
5595 | -- subprogram body is in the scope of a regular with clause for the | |
5596 | -- same unit. In such a case, the two type entities can be considered | |
5597 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
5598 | |
5599 | ---------------------- | |
5600 | -- Base_Types_Match -- | |
5601 | ---------------------- | |
5602 | ||
5603 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
5604 | begin | |
5605 | if T1 = T2 then | |
5606 | return True; | |
5607 | ||
5608 | elsif Base_Type (T1) = Base_Type (T2) then | |
5609 | ||
0a36105d | 5610 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
5611 | -- check that the generic actual is an ancestor subtype of the |
5612 | -- other ???. | |
5613 | ||
5614 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
5615 | or else not Is_Generic_Actual_Type (T2) |
5616 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 5617 | |
0a36105d JM |
5618 | else |
5619 | return False; | |
5620 | end if; | |
5621 | end Base_Types_Match; | |
aa720a54 | 5622 | |
5d37ba92 ES |
5623 | -------------------------- |
5624 | -- Find_Designated_Type -- | |
5625 | -------------------------- | |
5626 | ||
5627 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
5628 | Desig : Entity_Id; | |
5629 | ||
5630 | begin | |
5631 | Desig := Directly_Designated_Type (T); | |
5632 | ||
5633 | if Ekind (Desig) = E_Incomplete_Type then | |
5634 | ||
5635 | -- If regular incomplete type, get full view if available | |
5636 | ||
5637 | if Present (Full_View (Desig)) then | |
5638 | Desig := Full_View (Desig); | |
5639 | ||
5640 | -- If limited view of a type, get non-limited view if available, | |
5641 | -- and check again for a regular incomplete type. | |
5642 | ||
5643 | elsif Present (Non_Limited_View (Desig)) then | |
5644 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
5645 | end if; | |
5646 | end if; | |
5647 | ||
5648 | return Desig; | |
5649 | end Find_Designated_Type; | |
5650 | ||
0a36105d JM |
5651 | ------------------------------- |
5652 | -- Matches_Limited_With_View -- | |
5653 | ------------------------------- | |
5654 | ||
5655 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
5656 | begin | |
5657 | -- In some cases a type imported through a limited_with clause, and | |
5658 | -- its nonlimited view are both visible, for example in an anonymous | |
5659 | -- access-to-class-wide type in a formal. Both entities designate the | |
5660 | -- same type. | |
5661 | ||
5662 | if From_With_Type (T1) | |
5663 | and then T2 = Available_View (T1) | |
aa720a54 AC |
5664 | then |
5665 | return True; | |
5666 | ||
41251c60 | 5667 | elsif From_With_Type (T2) |
0a36105d | 5668 | and then T1 = Available_View (T2) |
41251c60 JM |
5669 | then |
5670 | return True; | |
5671 | ||
996ae0b0 RK |
5672 | else |
5673 | return False; | |
5674 | end if; | |
0a36105d | 5675 | end Matches_Limited_With_View; |
996ae0b0 | 5676 | |
ec4867fa | 5677 | -- Start of processing for Conforming_Types |
758c442c | 5678 | |
996ae0b0 RK |
5679 | begin |
5680 | -- The context is an instance association for a formal | |
82c80734 RD |
5681 | -- access-to-subprogram type; the formal parameter types require |
5682 | -- mapping because they may denote other formal parameters of the | |
5683 | -- generic unit. | |
996ae0b0 RK |
5684 | |
5685 | if Get_Inst then | |
5686 | Type_1 := Get_Instance_Of (T1); | |
5687 | Type_2 := Get_Instance_Of (T2); | |
5688 | end if; | |
5689 | ||
0a36105d JM |
5690 | -- If one of the types is a view of the other introduced by a limited |
5691 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 5692 | |
0a36105d JM |
5693 | if Matches_Limited_With_View (T1, T2) then |
5694 | return True; | |
5695 | ||
5696 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
5697 | return Ctype <= Mode_Conformant |
5698 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
5699 | ||
5700 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
5701 | and then Present (Full_View (Type_1)) | |
5702 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
5703 | then | |
5704 | return Ctype <= Mode_Conformant | |
5705 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
5706 | ||
5707 | elsif Ekind (Type_2) = E_Incomplete_Type | |
5708 | and then Present (Full_View (Type_2)) | |
5709 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
5710 | then | |
5711 | return Ctype <= Mode_Conformant | |
5712 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
5713 | |
5714 | elsif Is_Private_Type (Type_2) | |
5715 | and then In_Instance | |
5716 | and then Present (Full_View (Type_2)) | |
5717 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
5718 | then | |
5719 | return Ctype <= Mode_Conformant | |
5720 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
996ae0b0 RK |
5721 | end if; |
5722 | ||
0a36105d | 5723 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
758c442c | 5724 | -- treated recursively because they carry a signature. |
af4b9434 AC |
5725 | |
5726 | Are_Anonymous_Access_To_Subprogram_Types := | |
f937473f RD |
5727 | Ekind (Type_1) = Ekind (Type_2) |
5728 | and then | |
800621e0 | 5729 | (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type |
f937473f RD |
5730 | or else |
5731 | Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 5732 | |
996ae0b0 | 5733 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
5734 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
5735 | -- the base types because we may have built internal subtype entities | |
5736 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 5737 | |
5d37ba92 ES |
5738 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
5739 | and then | |
5740 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
0ab80019 | 5741 | or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254) |
996ae0b0 RK |
5742 | then |
5743 | declare | |
5744 | Desig_1 : Entity_Id; | |
5745 | Desig_2 : Entity_Id; | |
5746 | ||
5747 | begin | |
5d37ba92 ES |
5748 | -- In Ada2005, access constant indicators must match for |
5749 | -- subtype conformance. | |
9dcb52e1 | 5750 | |
0791fbe9 | 5751 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
5752 | and then Ctype >= Subtype_Conformant |
5753 | and then | |
5754 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
5755 | then | |
5756 | return False; | |
996ae0b0 RK |
5757 | end if; |
5758 | ||
5d37ba92 | 5759 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 5760 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 5761 | |
5d37ba92 | 5762 | -- If the context is an instance association for a formal |
82c80734 RD |
5763 | -- access-to-subprogram type; formal access parameter designated |
5764 | -- types require mapping because they may denote other formal | |
5765 | -- parameters of the generic unit. | |
996ae0b0 RK |
5766 | |
5767 | if Get_Inst then | |
5768 | Desig_1 := Get_Instance_Of (Desig_1); | |
5769 | Desig_2 := Get_Instance_Of (Desig_2); | |
5770 | end if; | |
5771 | ||
82c80734 RD |
5772 | -- It is possible for a Class_Wide_Type to be introduced for an |
5773 | -- incomplete type, in which case there is a separate class_ wide | |
5774 | -- type for the full view. The types conform if their Etypes | |
5775 | -- conform, i.e. one may be the full view of the other. This can | |
5776 | -- only happen in the context of an access parameter, other uses | |
5777 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 5778 | |
fbf5a39b | 5779 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
5780 | and then |
5781 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
5782 | then |
5783 | return | |
fbf5a39b AC |
5784 | Conforming_Types |
5785 | (Etype (Base_Type (Desig_1)), | |
5786 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
5787 | |
5788 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 5789 | if Ada_Version < Ada_2005 then |
758c442c GD |
5790 | return Ctype = Type_Conformant |
5791 | or else | |
af4b9434 AC |
5792 | Subtypes_Statically_Match (Desig_1, Desig_2); |
5793 | ||
758c442c GD |
5794 | -- We must check the conformance of the signatures themselves |
5795 | ||
5796 | else | |
5797 | declare | |
5798 | Conformant : Boolean; | |
5799 | begin | |
5800 | Check_Conformance | |
5801 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
5802 | return Conformant; | |
5803 | end; | |
5804 | end if; | |
5805 | ||
996ae0b0 RK |
5806 | else |
5807 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
5808 | and then (Ctype = Type_Conformant | |
af4b9434 AC |
5809 | or else |
5810 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
5811 | end if; |
5812 | end; | |
5813 | ||
5814 | -- Otherwise definitely no match | |
5815 | ||
5816 | else | |
c8ef728f ES |
5817 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
5818 | and then Is_Access_Type (Type_2)) | |
5819 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
5820 | and then Is_Access_Type (Type_1))) | |
5821 | and then | |
5822 | Conforming_Types | |
5823 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
5824 | then | |
5825 | May_Hide_Profile := True; | |
5826 | end if; | |
5827 | ||
996ae0b0 RK |
5828 | return False; |
5829 | end if; | |
996ae0b0 RK |
5830 | end Conforming_Types; |
5831 | ||
5832 | -------------------------- | |
5833 | -- Create_Extra_Formals -- | |
5834 | -------------------------- | |
5835 | ||
5836 | procedure Create_Extra_Formals (E : Entity_Id) is | |
5837 | Formal : Entity_Id; | |
ec4867fa | 5838 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
5839 | Last_Extra : Entity_Id; |
5840 | Formal_Type : Entity_Id; | |
5841 | P_Formal : Entity_Id := Empty; | |
5842 | ||
ec4867fa ES |
5843 | function Add_Extra_Formal |
5844 | (Assoc_Entity : Entity_Id; | |
5845 | Typ : Entity_Id; | |
5846 | Scope : Entity_Id; | |
5847 | Suffix : String) return Entity_Id; | |
5848 | -- Add an extra formal to the current list of formals and extra formals. | |
5849 | -- The extra formal is added to the end of the list of extra formals, | |
5850 | -- and also returned as the result. These formals are always of mode IN. | |
5851 | -- The new formal has the type Typ, is declared in Scope, and its name | |
5852 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
5853 | -- The following suffixes are currently used. They should not be changed |
5854 | -- without coordinating with CodePeer, which makes use of these to | |
5855 | -- provide better messages. | |
5856 | ||
d92eccc3 AC |
5857 | -- O denotes the Constrained bit. |
5858 | -- L denotes the accessibility level. | |
cd5a9750 AC |
5859 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
5860 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 5861 | |
fbf5a39b AC |
5862 | ---------------------- |
5863 | -- Add_Extra_Formal -- | |
5864 | ---------------------- | |
5865 | ||
ec4867fa ES |
5866 | function Add_Extra_Formal |
5867 | (Assoc_Entity : Entity_Id; | |
5868 | Typ : Entity_Id; | |
5869 | Scope : Entity_Id; | |
5870 | Suffix : String) return Entity_Id | |
5871 | is | |
996ae0b0 | 5872 | EF : constant Entity_Id := |
ec4867fa ES |
5873 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
5874 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 5875 | Suffix => Suffix)); |
996ae0b0 RK |
5876 | |
5877 | begin | |
82c80734 RD |
5878 | -- A little optimization. Never generate an extra formal for the |
5879 | -- _init operand of an initialization procedure, since it could | |
5880 | -- never be used. | |
996ae0b0 RK |
5881 | |
5882 | if Chars (Formal) = Name_uInit then | |
5883 | return Empty; | |
5884 | end if; | |
5885 | ||
5886 | Set_Ekind (EF, E_In_Parameter); | |
5887 | Set_Actual_Subtype (EF, Typ); | |
5888 | Set_Etype (EF, Typ); | |
ec4867fa | 5889 | Set_Scope (EF, Scope); |
996ae0b0 RK |
5890 | Set_Mechanism (EF, Default_Mechanism); |
5891 | Set_Formal_Validity (EF); | |
5892 | ||
ec4867fa ES |
5893 | if No (First_Extra) then |
5894 | First_Extra := EF; | |
5895 | Set_Extra_Formals (Scope, First_Extra); | |
5896 | end if; | |
5897 | ||
5898 | if Present (Last_Extra) then | |
5899 | Set_Extra_Formal (Last_Extra, EF); | |
5900 | end if; | |
5901 | ||
996ae0b0 | 5902 | Last_Extra := EF; |
ec4867fa | 5903 | |
996ae0b0 RK |
5904 | return EF; |
5905 | end Add_Extra_Formal; | |
5906 | ||
5907 | -- Start of processing for Create_Extra_Formals | |
5908 | ||
5909 | begin | |
f937473f RD |
5910 | -- We never generate extra formals if expansion is not active |
5911 | -- because we don't need them unless we are generating code. | |
5912 | ||
5913 | if not Expander_Active then | |
5914 | return; | |
5915 | end if; | |
5916 | ||
82c80734 | 5917 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 5918 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 5919 | -- for extra formals. |
996ae0b0 RK |
5920 | |
5921 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
5922 | P_Formal := First_Formal (Alias (E)); | |
5923 | end if; | |
5924 | ||
5925 | Last_Extra := Empty; | |
5926 | Formal := First_Formal (E); | |
5927 | while Present (Formal) loop | |
5928 | Last_Extra := Formal; | |
5929 | Next_Formal (Formal); | |
5930 | end loop; | |
5931 | ||
f937473f | 5932 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
5933 | -- situation may arise for subprogram types created as part of |
5934 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 RK |
5935 | |
5936 | if Present (Last_Extra) and then | |
5937 | Present (Extra_Formal (Last_Extra)) | |
5938 | then | |
5939 | return; | |
5940 | end if; | |
5941 | ||
19590d70 GD |
5942 | -- If the subprogram is a predefined dispatching subprogram then don't |
5943 | -- generate any extra constrained or accessibility level formals. In | |
5944 | -- general we suppress these for internal subprograms (by not calling | |
5945 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
5946 | -- generated stream attributes do get passed through because extra | |
5947 | -- build-in-place formals are needed in some cases (limited 'Input). | |
5948 | ||
bac7206d | 5949 | if Is_Predefined_Internal_Operation (E) then |
19590d70 GD |
5950 | goto Test_For_BIP_Extras; |
5951 | end if; | |
5952 | ||
996ae0b0 | 5953 | Formal := First_Formal (E); |
996ae0b0 RK |
5954 | while Present (Formal) loop |
5955 | ||
5956 | -- Create extra formal for supporting the attribute 'Constrained. | |
5957 | -- The case of a private type view without discriminants also | |
5958 | -- requires the extra formal if the underlying type has defaulted | |
5959 | -- discriminants. | |
5960 | ||
5961 | if Ekind (Formal) /= E_In_Parameter then | |
5962 | if Present (P_Formal) then | |
5963 | Formal_Type := Etype (P_Formal); | |
5964 | else | |
5965 | Formal_Type := Etype (Formal); | |
5966 | end if; | |
5967 | ||
5d09245e AC |
5968 | -- Do not produce extra formals for Unchecked_Union parameters. |
5969 | -- Jump directly to the end of the loop. | |
5970 | ||
5971 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
5972 | goto Skip_Extra_Formal_Generation; | |
5973 | end if; | |
5974 | ||
996ae0b0 RK |
5975 | if not Has_Discriminants (Formal_Type) |
5976 | and then Ekind (Formal_Type) in Private_Kind | |
5977 | and then Present (Underlying_Type (Formal_Type)) | |
5978 | then | |
5979 | Formal_Type := Underlying_Type (Formal_Type); | |
5980 | end if; | |
5981 | ||
5e5db3b4 GD |
5982 | -- Suppress the extra formal if formal's subtype is constrained or |
5983 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
5984 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
5985 | -- can have defaulted discriminants, but 'Constrained is required | |
5986 | -- to return True, so the formal is never needed (see AI05-0214). | |
5987 | -- Note that this ensures consistency of calling sequences for | |
5988 | -- dispatching operations when some types in a class have defaults | |
5989 | -- on discriminants and others do not (and requiring the extra | |
5990 | -- formal would introduce distributed overhead). | |
5991 | ||
996ae0b0 | 5992 | if Has_Discriminants (Formal_Type) |
f937473f RD |
5993 | and then not Is_Constrained (Formal_Type) |
5994 | and then not Is_Indefinite_Subtype (Formal_Type) | |
5e5db3b4 GD |
5995 | and then (Ada_Version < Ada_2012 |
5996 | or else | |
5997 | not (Is_Tagged_Type (Underlying_Type (Formal_Type)) | |
5998 | and then Is_Limited_Type (Formal_Type))) | |
996ae0b0 RK |
5999 | then |
6000 | Set_Extra_Constrained | |
d92eccc3 | 6001 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
6002 | end if; |
6003 | end if; | |
6004 | ||
0a36105d JM |
6005 | -- Create extra formal for supporting accessibility checking. This |
6006 | -- is done for both anonymous access formals and formals of named | |
6007 | -- access types that are marked as controlling formals. The latter | |
6008 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
6009 | -- type and substitutes the types of access-to-class-wide actuals | |
6010 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
6011 | -- Base_Type is applied because in cases where there is a null |
6012 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
6013 | |
6014 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 6015 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
6016 | -- package in which it resides. However, we do not suppress it |
6017 | -- simply if the scope has accessibility checks suppressed, since | |
6018 | -- this could cause trouble when clients are compiled with a | |
6019 | -- different suppression setting. The explicit checks at the | |
6020 | -- package level are safe from this point of view. | |
996ae0b0 | 6021 | |
5d37ba92 | 6022 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 6023 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 6024 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 6025 | and then not |
fbf5a39b | 6026 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 6027 | or else |
fbf5a39b | 6028 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 6029 | and then |
c8ef728f | 6030 | (No (P_Formal) |
996ae0b0 RK |
6031 | or else Present (Extra_Accessibility (P_Formal))) |
6032 | then | |
811c6a85 | 6033 | Set_Extra_Accessibility |
d92eccc3 | 6034 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
6035 | end if; |
6036 | ||
5d09245e AC |
6037 | -- This label is required when skipping extra formal generation for |
6038 | -- Unchecked_Union parameters. | |
6039 | ||
6040 | <<Skip_Extra_Formal_Generation>> | |
6041 | ||
f937473f RD |
6042 | if Present (P_Formal) then |
6043 | Next_Formal (P_Formal); | |
6044 | end if; | |
6045 | ||
996ae0b0 RK |
6046 | Next_Formal (Formal); |
6047 | end loop; | |
ec4867fa | 6048 | |
19590d70 GD |
6049 | <<Test_For_BIP_Extras>> |
6050 | ||
ec4867fa | 6051 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
6052 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
6053 | ||
0791fbe9 | 6054 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 6055 | declare |
f937473f RD |
6056 | Result_Subt : constant Entity_Id := Etype (E); |
6057 | ||
6058 | Discard : Entity_Id; | |
6059 | pragma Warnings (Off, Discard); | |
ec4867fa ES |
6060 | |
6061 | begin | |
f937473f | 6062 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
6063 | -- add a 4-state formal indicating whether the return object is |
6064 | -- allocated by the caller (1), or should be allocated by the | |
6065 | -- callee on the secondary stack (2), in the global heap (3), or | |
6066 | -- in a user-defined storage pool (4). For the moment we just use | |
6067 | -- Natural for the type of this formal. Note that this formal | |
6068 | -- isn't usually needed in the case where the result subtype is | |
6069 | -- constrained, but it is needed when the function has a tagged | |
6070 | -- result, because generally such functions can be called in a | |
6071 | -- dispatching context and such calls must be handled like calls | |
6072 | -- to a class-wide function. | |
0a36105d | 6073 | |
a38ff9b1 | 6074 | if not Is_Constrained (Underlying_Type (Result_Subt)) |
0a36105d JM |
6075 | or else Is_Tagged_Type (Underlying_Type (Result_Subt)) |
6076 | then | |
f937473f RD |
6077 | Discard := |
6078 | Add_Extra_Formal | |
6079 | (E, Standard_Natural, | |
6080 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
6081 | end if; | |
ec4867fa | 6082 | |
df3e68b1 | 6083 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 6084 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 6085 | |
ca5af305 | 6086 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
6087 | Discard := |
6088 | Add_Extra_Formal | |
ca5af305 AC |
6089 | (E, RTE (RE_Finalization_Master_Ptr), |
6090 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
6091 | end if; |
6092 | ||
6093 | -- If the result type contains tasks, we have two extra formals: | |
6094 | -- the master of the tasks to be created, and the caller's | |
6095 | -- activation chain. | |
6096 | ||
6097 | if Has_Task (Result_Subt) then | |
6098 | Discard := | |
6099 | Add_Extra_Formal | |
6100 | (E, RTE (RE_Master_Id), | |
6101 | E, BIP_Formal_Suffix (BIP_Master)); | |
6102 | Discard := | |
6103 | Add_Extra_Formal | |
6104 | (E, RTE (RE_Activation_Chain_Access), | |
6105 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
6106 | end if; | |
ec4867fa | 6107 | |
f937473f RD |
6108 | -- All build-in-place functions get an extra formal that will be |
6109 | -- passed the address of the return object within the caller. | |
ec4867fa | 6110 | |
f937473f RD |
6111 | declare |
6112 | Formal_Type : constant Entity_Id := | |
6113 | Create_Itype | |
6114 | (E_Anonymous_Access_Type, E, | |
6115 | Scope_Id => Scope (E)); | |
6116 | begin | |
6117 | Set_Directly_Designated_Type (Formal_Type, Result_Subt); | |
6118 | Set_Etype (Formal_Type, Formal_Type); | |
f937473f RD |
6119 | Set_Depends_On_Private |
6120 | (Formal_Type, Has_Private_Component (Formal_Type)); | |
6121 | Set_Is_Public (Formal_Type, Is_Public (Scope (Formal_Type))); | |
6122 | Set_Is_Access_Constant (Formal_Type, False); | |
ec4867fa | 6123 | |
f937473f RD |
6124 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
6125 | -- the designated type comes from the limited view (for | |
6126 | -- back-end purposes). | |
ec4867fa | 6127 | |
f937473f | 6128 | Set_From_With_Type (Formal_Type, From_With_Type (Result_Subt)); |
ec4867fa | 6129 | |
f937473f RD |
6130 | Layout_Type (Formal_Type); |
6131 | ||
6132 | Discard := | |
6133 | Add_Extra_Formal | |
6134 | (E, Formal_Type, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
6135 | end; | |
ec4867fa ES |
6136 | end; |
6137 | end if; | |
996ae0b0 RK |
6138 | end Create_Extra_Formals; |
6139 | ||
6140 | ----------------------------- | |
6141 | -- Enter_Overloaded_Entity -- | |
6142 | ----------------------------- | |
6143 | ||
6144 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
6145 | E : Entity_Id := Current_Entity_In_Scope (S); | |
6146 | C_E : Entity_Id := Current_Entity (S); | |
6147 | ||
6148 | begin | |
6149 | if Present (E) then | |
6150 | Set_Has_Homonym (E); | |
6151 | Set_Has_Homonym (S); | |
6152 | end if; | |
6153 | ||
6154 | Set_Is_Immediately_Visible (S); | |
6155 | Set_Scope (S, Current_Scope); | |
6156 | ||
6157 | -- Chain new entity if front of homonym in current scope, so that | |
6158 | -- homonyms are contiguous. | |
6159 | ||
6160 | if Present (E) | |
6161 | and then E /= C_E | |
6162 | then | |
6163 | while Homonym (C_E) /= E loop | |
6164 | C_E := Homonym (C_E); | |
6165 | end loop; | |
6166 | ||
6167 | Set_Homonym (C_E, S); | |
6168 | ||
6169 | else | |
6170 | E := C_E; | |
6171 | Set_Current_Entity (S); | |
6172 | end if; | |
6173 | ||
6174 | Set_Homonym (S, E); | |
6175 | ||
6176 | Append_Entity (S, Current_Scope); | |
6177 | Set_Public_Status (S); | |
6178 | ||
6179 | if Debug_Flag_E then | |
6180 | Write_Str ("New overloaded entity chain: "); | |
6181 | Write_Name (Chars (S)); | |
996ae0b0 | 6182 | |
82c80734 | 6183 | E := S; |
996ae0b0 RK |
6184 | while Present (E) loop |
6185 | Write_Str (" "); Write_Int (Int (E)); | |
6186 | E := Homonym (E); | |
6187 | end loop; | |
6188 | ||
6189 | Write_Eol; | |
6190 | end if; | |
6191 | ||
6192 | -- Generate warning for hiding | |
6193 | ||
6194 | if Warn_On_Hiding | |
6195 | and then Comes_From_Source (S) | |
6196 | and then In_Extended_Main_Source_Unit (S) | |
6197 | then | |
6198 | E := S; | |
6199 | loop | |
6200 | E := Homonym (E); | |
6201 | exit when No (E); | |
6202 | ||
7fc53871 AC |
6203 | -- Warn unless genuine overloading. Do not emit warning on |
6204 | -- hiding predefined operators in Standard (these are either an | |
6205 | -- (artifact of our implicit declarations, or simple noise) but | |
6206 | -- keep warning on a operator defined on a local subtype, because | |
6207 | -- of the real danger that different operators may be applied in | |
6208 | -- various parts of the program. | |
996ae0b0 | 6209 | |
1f250383 AC |
6210 | -- Note that if E and S have the same scope, there is never any |
6211 | -- hiding. Either the two conflict, and the program is illegal, | |
6212 | -- or S is overriding an implicit inherited subprogram. | |
6213 | ||
6214 | if Scope (E) /= Scope (S) | |
6215 | and then (not Is_Overloadable (E) | |
8d606a78 | 6216 | or else Subtype_Conformant (E, S)) |
f937473f RD |
6217 | and then (Is_Immediately_Visible (E) |
6218 | or else | |
6219 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 6220 | then |
7fc53871 AC |
6221 | if Scope (E) /= Standard_Standard then |
6222 | Error_Msg_Sloc := Sloc (E); | |
6223 | Error_Msg_N ("declaration of & hides one#?", S); | |
6224 | ||
6225 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
6226 | and then | |
1f250383 | 6227 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
6228 | then |
6229 | Error_Msg_N | |
6230 | ("declaration of & hides predefined operator?", S); | |
6231 | end if; | |
996ae0b0 RK |
6232 | end if; |
6233 | end loop; | |
6234 | end if; | |
6235 | end Enter_Overloaded_Entity; | |
6236 | ||
e5a58fac AC |
6237 | ----------------------------- |
6238 | -- Check_Untagged_Equality -- | |
6239 | ----------------------------- | |
6240 | ||
6241 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
6242 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
6243 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
6244 | Obj_Decl : Node_Id; | |
6245 | ||
6246 | begin | |
6247 | if Nkind (Decl) = N_Subprogram_Declaration | |
6248 | and then Is_Record_Type (Typ) | |
6249 | and then not Is_Tagged_Type (Typ) | |
6250 | then | |
21a5b575 AC |
6251 | -- If the type is not declared in a package, or if we are in the |
6252 | -- body of the package or in some other scope, the new operation is | |
6253 | -- not primitive, and therefore legal, though suspicious. If the | |
6254 | -- type is a generic actual (sub)type, the operation is not primitive | |
6255 | -- either because the base type is declared elsewhere. | |
6256 | ||
e5a58fac | 6257 | if Is_Frozen (Typ) then |
21a5b575 AC |
6258 | if Ekind (Scope (Typ)) /= E_Package |
6259 | or else Scope (Typ) /= Current_Scope | |
6260 | then | |
6261 | null; | |
e5a58fac | 6262 | |
21a5b575 AC |
6263 | elsif Is_Generic_Actual_Type (Typ) then |
6264 | null; | |
e5a58fac | 6265 | |
21a5b575 | 6266 | elsif In_Package_Body (Scope (Typ)) then |
ae6ede77 AC |
6267 | Error_Msg_NE |
6268 | ("equality operator must be declared " | |
6269 | & "before type& is frozen", Eq_Op, Typ); | |
6270 | Error_Msg_N | |
6271 | ("\move declaration to package spec", Eq_Op); | |
21a5b575 AC |
6272 | |
6273 | else | |
6274 | Error_Msg_NE | |
6275 | ("equality operator must be declared " | |
6276 | & "before type& is frozen", Eq_Op, Typ); | |
6277 | ||
6278 | Obj_Decl := Next (Parent (Typ)); | |
6279 | while Present (Obj_Decl) | |
6280 | and then Obj_Decl /= Decl | |
6281 | loop | |
6282 | if Nkind (Obj_Decl) = N_Object_Declaration | |
6283 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
6284 | then | |
6285 | Error_Msg_NE ("type& is frozen by declaration?", | |
6286 | Obj_Decl, Typ); | |
6287 | Error_Msg_N | |
6288 | ("\an equality operator cannot be declared after this " | |
a4640a39 | 6289 | & "point (RM 4.5.2 (9.8)) (Ada 2012))?", Obj_Decl); |
21a5b575 AC |
6290 | exit; |
6291 | end if; | |
6292 | ||
6293 | Next (Obj_Decl); | |
6294 | end loop; | |
6295 | end if; | |
e5a58fac AC |
6296 | |
6297 | elsif not In_Same_List (Parent (Typ), Decl) | |
6298 | and then not Is_Limited_Type (Typ) | |
6299 | then | |
21a5b575 AC |
6300 | |
6301 | -- This makes it illegal to have a primitive equality declared in | |
6302 | -- the private part if the type is visible. | |
6303 | ||
e5a58fac AC |
6304 | Error_Msg_N ("equality operator appears too late", Eq_Op); |
6305 | end if; | |
6306 | end if; | |
6307 | end Check_Untagged_Equality; | |
6308 | ||
996ae0b0 RK |
6309 | ----------------------------- |
6310 | -- Find_Corresponding_Spec -- | |
6311 | ----------------------------- | |
6312 | ||
d44202ba HK |
6313 | function Find_Corresponding_Spec |
6314 | (N : Node_Id; | |
6315 | Post_Error : Boolean := True) return Entity_Id | |
6316 | is | |
996ae0b0 RK |
6317 | Spec : constant Node_Id := Specification (N); |
6318 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
6319 | ||
6320 | E : Entity_Id; | |
6321 | ||
6322 | begin | |
6323 | E := Current_Entity (Designator); | |
996ae0b0 RK |
6324 | while Present (E) loop |
6325 | ||
6326 | -- We are looking for a matching spec. It must have the same scope, | |
6327 | -- and the same name, and either be type conformant, or be the case | |
6328 | -- of a library procedure spec and its body (which belong to one | |
6329 | -- another regardless of whether they are type conformant or not). | |
6330 | ||
6331 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
6332 | if Current_Scope = Standard_Standard |
6333 | or else (Ekind (E) = Ekind (Designator) | |
6334 | and then Type_Conformant (E, Designator)) | |
996ae0b0 RK |
6335 | then |
6336 | -- Within an instantiation, we know that spec and body are | |
6337 | -- subtype conformant, because they were subtype conformant | |
6338 | -- in the generic. We choose the subtype-conformant entity | |
6339 | -- here as well, to resolve spurious ambiguities in the | |
6340 | -- instance that were not present in the generic (i.e. when | |
6341 | -- two different types are given the same actual). If we are | |
6342 | -- looking for a spec to match a body, full conformance is | |
6343 | -- expected. | |
6344 | ||
6345 | if In_Instance then | |
6346 | Set_Convention (Designator, Convention (E)); | |
6347 | ||
0187b60e AC |
6348 | -- Skip past subprogram bodies and subprogram renamings that |
6349 | -- may appear to have a matching spec, but that aren't fully | |
6350 | -- conformant with it. That can occur in cases where an | |
6351 | -- actual type causes unrelated homographs in the instance. | |
6352 | ||
6353 | if Nkind_In (N, N_Subprogram_Body, | |
6354 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 6355 | and then Present (Homonym (E)) |
c7b9d548 | 6356 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
6357 | then |
6358 | goto Next_Entity; | |
6359 | ||
c7b9d548 | 6360 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 RK |
6361 | goto Next_Entity; |
6362 | end if; | |
6363 | end if; | |
6364 | ||
6365 | if not Has_Completion (E) then | |
996ae0b0 RK |
6366 | if Nkind (N) /= N_Subprogram_Body_Stub then |
6367 | Set_Corresponding_Spec (N, E); | |
6368 | end if; | |
6369 | ||
6370 | Set_Has_Completion (E); | |
6371 | return E; | |
6372 | ||
6373 | elsif Nkind (Parent (N)) = N_Subunit then | |
6374 | ||
6375 | -- If this is the proper body of a subunit, the completion | |
6376 | -- flag is set when analyzing the stub. | |
6377 | ||
6378 | return E; | |
6379 | ||
81db9d77 ES |
6380 | -- If E is an internal function with a controlling result |
6381 | -- that was created for an operation inherited by a null | |
6382 | -- extension, it may be overridden by a body without a previous | |
6383 | -- spec (one more reason why these should be shunned). In that | |
1366997b AC |
6384 | -- case remove the generated body if present, because the |
6385 | -- current one is the explicit overriding. | |
81db9d77 ES |
6386 | |
6387 | elsif Ekind (E) = E_Function | |
0791fbe9 | 6388 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
6389 | and then not Comes_From_Source (E) |
6390 | and then Has_Controlling_Result (E) | |
6391 | and then Is_Null_Extension (Etype (E)) | |
6392 | and then Comes_From_Source (Spec) | |
6393 | then | |
6394 | Set_Has_Completion (E, False); | |
6395 | ||
1366997b AC |
6396 | if Expander_Active |
6397 | and then Nkind (Parent (E)) = N_Function_Specification | |
6398 | then | |
81db9d77 ES |
6399 | Remove |
6400 | (Unit_Declaration_Node | |
1366997b AC |
6401 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
6402 | ||
81db9d77 ES |
6403 | return E; |
6404 | ||
1366997b AC |
6405 | -- If expansion is disabled, or if the wrapper function has |
6406 | -- not been generated yet, this a late body overriding an | |
6407 | -- inherited operation, or it is an overriding by some other | |
6408 | -- declaration before the controlling result is frozen. In | |
6409 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
6410 | |
6411 | else | |
6412 | return Empty; | |
6413 | end if; | |
6414 | ||
d44202ba HK |
6415 | -- If the body already exists, then this is an error unless |
6416 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
6417 | -- derived subprogram. It is also legal for an instance to |
6418 | -- contain type conformant overloadable declarations (but the | |
6419 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
6420 | |
6421 | elsif No (Alias (E)) | |
6422 | and then not Is_Intrinsic_Subprogram (E) | |
6423 | and then not In_Instance | |
d44202ba | 6424 | and then Post_Error |
996ae0b0 RK |
6425 | then |
6426 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 6427 | |
07fc65c4 GB |
6428 | if Is_Imported (E) then |
6429 | Error_Msg_NE | |
6430 | ("body not allowed for imported subprogram & declared#", | |
6431 | N, E); | |
6432 | else | |
6433 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
6434 | end if; | |
996ae0b0 RK |
6435 | end if; |
6436 | ||
d44202ba HK |
6437 | -- Child units cannot be overloaded, so a conformance mismatch |
6438 | -- between body and a previous spec is an error. | |
6439 | ||
996ae0b0 RK |
6440 | elsif Is_Child_Unit (E) |
6441 | and then | |
6442 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
6443 | and then | |
5d37ba92 | 6444 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
6445 | N_Compilation_Unit |
6446 | and then Post_Error | |
996ae0b0 | 6447 | then |
996ae0b0 RK |
6448 | Error_Msg_N |
6449 | ("body of child unit does not match previous declaration", N); | |
6450 | end if; | |
6451 | end if; | |
6452 | ||
6453 | <<Next_Entity>> | |
6454 | E := Homonym (E); | |
6455 | end loop; | |
6456 | ||
6457 | -- On exit, we know that no previous declaration of subprogram exists | |
6458 | ||
6459 | return Empty; | |
6460 | end Find_Corresponding_Spec; | |
6461 | ||
6462 | ---------------------- | |
6463 | -- Fully_Conformant -- | |
6464 | ---------------------- | |
6465 | ||
6466 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
6467 | Result : Boolean; | |
996ae0b0 RK |
6468 | begin |
6469 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
6470 | return Result; | |
6471 | end Fully_Conformant; | |
6472 | ||
6473 | ---------------------------------- | |
6474 | -- Fully_Conformant_Expressions -- | |
6475 | ---------------------------------- | |
6476 | ||
6477 | function Fully_Conformant_Expressions | |
6478 | (Given_E1 : Node_Id; | |
d05ef0ab | 6479 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
6480 | is |
6481 | E1 : constant Node_Id := Original_Node (Given_E1); | |
6482 | E2 : constant Node_Id := Original_Node (Given_E2); | |
6483 | -- We always test conformance on original nodes, since it is possible | |
6484 | -- for analysis and/or expansion to make things look as though they | |
6485 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
6486 | ||
6487 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
6488 | renames Fully_Conformant_Expressions; | |
6489 | ||
6490 | function FCL (L1, L2 : List_Id) return Boolean; | |
6491 | -- Compare elements of two lists for conformance. Elements have to | |
6492 | -- be conformant, and actuals inserted as default parameters do not | |
6493 | -- match explicit actuals with the same value. | |
6494 | ||
6495 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 6496 | -- Compare an operator node with a function call |
996ae0b0 RK |
6497 | |
6498 | --------- | |
6499 | -- FCL -- | |
6500 | --------- | |
6501 | ||
6502 | function FCL (L1, L2 : List_Id) return Boolean is | |
6503 | N1, N2 : Node_Id; | |
6504 | ||
6505 | begin | |
6506 | if L1 = No_List then | |
6507 | N1 := Empty; | |
6508 | else | |
6509 | N1 := First (L1); | |
6510 | end if; | |
6511 | ||
6512 | if L2 = No_List then | |
6513 | N2 := Empty; | |
6514 | else | |
6515 | N2 := First (L2); | |
6516 | end if; | |
6517 | ||
6518 | -- Compare two lists, skipping rewrite insertions (we want to | |
6519 | -- compare the original trees, not the expanded versions!) | |
6520 | ||
6521 | loop | |
6522 | if Is_Rewrite_Insertion (N1) then | |
6523 | Next (N1); | |
6524 | elsif Is_Rewrite_Insertion (N2) then | |
6525 | Next (N2); | |
6526 | elsif No (N1) then | |
6527 | return No (N2); | |
6528 | elsif No (N2) then | |
6529 | return False; | |
6530 | elsif not FCE (N1, N2) then | |
6531 | return False; | |
6532 | else | |
6533 | Next (N1); | |
6534 | Next (N2); | |
6535 | end if; | |
6536 | end loop; | |
6537 | end FCL; | |
6538 | ||
6539 | --------- | |
6540 | -- FCO -- | |
6541 | --------- | |
6542 | ||
6543 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
6544 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
6545 | Act : Node_Id; | |
6546 | ||
6547 | begin | |
6548 | if No (Actuals) | |
6549 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
6550 | then | |
6551 | return False; | |
6552 | ||
6553 | else | |
6554 | Act := First (Actuals); | |
6555 | ||
6556 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
6557 | if not FCE (Left_Opnd (Op_Node), Act) then |
6558 | return False; | |
6559 | end if; | |
6560 | ||
6561 | Next (Act); | |
6562 | end if; | |
6563 | ||
6564 | return Present (Act) | |
6565 | and then FCE (Right_Opnd (Op_Node), Act) | |
6566 | and then No (Next (Act)); | |
6567 | end if; | |
6568 | end FCO; | |
6569 | ||
6570 | -- Start of processing for Fully_Conformant_Expressions | |
6571 | ||
6572 | begin | |
6573 | -- Non-conformant if paren count does not match. Note: if some idiot | |
6574 | -- complains that we don't do this right for more than 3 levels of | |
0a36105d | 6575 | -- parentheses, they will be treated with the respect they deserve! |
996ae0b0 RK |
6576 | |
6577 | if Paren_Count (E1) /= Paren_Count (E2) then | |
6578 | return False; | |
6579 | ||
82c80734 RD |
6580 | -- If same entities are referenced, then they are conformant even if |
6581 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
6582 | |
6583 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
6584 | if Present (Entity (E1)) then | |
6585 | return Entity (E1) = Entity (E2) | |
6586 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
6587 | and then Ekind (Entity (E1)) = E_Discriminant | |
6588 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
6589 | ||
6590 | elsif Nkind (E1) = N_Expanded_Name | |
6591 | and then Nkind (E2) = N_Expanded_Name | |
6592 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
6593 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
6594 | then | |
6595 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
6596 | ||
6597 | else | |
6598 | -- Identifiers in component associations don't always have | |
6599 | -- entities, but their names must conform. | |
6600 | ||
6601 | return Nkind (E1) = N_Identifier | |
6602 | and then Nkind (E2) = N_Identifier | |
6603 | and then Chars (E1) = Chars (E2); | |
6604 | end if; | |
6605 | ||
6606 | elsif Nkind (E1) = N_Character_Literal | |
6607 | and then Nkind (E2) = N_Expanded_Name | |
6608 | then | |
6609 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
6610 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
6611 | ||
6612 | elsif Nkind (E2) = N_Character_Literal | |
6613 | and then Nkind (E1) = N_Expanded_Name | |
6614 | then | |
6615 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
6616 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
6617 | ||
6618 | elsif Nkind (E1) in N_Op | |
6619 | and then Nkind (E2) = N_Function_Call | |
6620 | then | |
6621 | return FCO (E1, E2); | |
6622 | ||
6623 | elsif Nkind (E2) in N_Op | |
6624 | and then Nkind (E1) = N_Function_Call | |
6625 | then | |
6626 | return FCO (E2, E1); | |
6627 | ||
6628 | -- Otherwise we must have the same syntactic entity | |
6629 | ||
6630 | elsif Nkind (E1) /= Nkind (E2) then | |
6631 | return False; | |
6632 | ||
6633 | -- At this point, we specialize by node type | |
6634 | ||
6635 | else | |
6636 | case Nkind (E1) is | |
6637 | ||
6638 | when N_Aggregate => | |
6639 | return | |
6640 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
6641 | and then |
6642 | FCL (Component_Associations (E1), | |
6643 | Component_Associations (E2)); | |
996ae0b0 RK |
6644 | |
6645 | when N_Allocator => | |
6646 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
6647 | or else | |
6648 | Nkind (Expression (E2)) = N_Qualified_Expression | |
6649 | then | |
6650 | return FCE (Expression (E1), Expression (E2)); | |
6651 | ||
6652 | -- Check that the subtype marks and any constraints | |
6653 | -- are conformant | |
6654 | ||
6655 | else | |
6656 | declare | |
6657 | Indic1 : constant Node_Id := Expression (E1); | |
6658 | Indic2 : constant Node_Id := Expression (E2); | |
6659 | Elt1 : Node_Id; | |
6660 | Elt2 : Node_Id; | |
6661 | ||
6662 | begin | |
6663 | if Nkind (Indic1) /= N_Subtype_Indication then | |
6664 | return | |
6665 | Nkind (Indic2) /= N_Subtype_Indication | |
6666 | and then Entity (Indic1) = Entity (Indic2); | |
6667 | ||
6668 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
6669 | return | |
6670 | Nkind (Indic1) /= N_Subtype_Indication | |
6671 | and then Entity (Indic1) = Entity (Indic2); | |
6672 | ||
6673 | else | |
6674 | if Entity (Subtype_Mark (Indic1)) /= | |
6675 | Entity (Subtype_Mark (Indic2)) | |
6676 | then | |
6677 | return False; | |
6678 | end if; | |
6679 | ||
6680 | Elt1 := First (Constraints (Constraint (Indic1))); | |
6681 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
6682 | while Present (Elt1) and then Present (Elt2) loop |
6683 | if not FCE (Elt1, Elt2) then | |
6684 | return False; | |
6685 | end if; | |
6686 | ||
6687 | Next (Elt1); | |
6688 | Next (Elt2); | |
6689 | end loop; | |
6690 | ||
6691 | return True; | |
6692 | end if; | |
6693 | end; | |
6694 | end if; | |
6695 | ||
6696 | when N_Attribute_Reference => | |
6697 | return | |
6698 | Attribute_Name (E1) = Attribute_Name (E2) | |
6699 | and then FCL (Expressions (E1), Expressions (E2)); | |
6700 | ||
6701 | when N_Binary_Op => | |
6702 | return | |
6703 | Entity (E1) = Entity (E2) | |
6704 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
6705 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
6706 | ||
514d0fc5 | 6707 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
6708 | return |
6709 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
6710 | and then | |
6711 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
6712 | ||
19d846a0 RD |
6713 | when N_Case_Expression => |
6714 | declare | |
6715 | Alt1 : Node_Id; | |
6716 | Alt2 : Node_Id; | |
6717 | ||
6718 | begin | |
6719 | if not FCE (Expression (E1), Expression (E2)) then | |
6720 | return False; | |
6721 | ||
6722 | else | |
6723 | Alt1 := First (Alternatives (E1)); | |
6724 | Alt2 := First (Alternatives (E2)); | |
6725 | loop | |
6726 | if Present (Alt1) /= Present (Alt2) then | |
6727 | return False; | |
6728 | elsif No (Alt1) then | |
6729 | return True; | |
6730 | end if; | |
6731 | ||
6732 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
6733 | or else not FCL (Discrete_Choices (Alt1), | |
6734 | Discrete_Choices (Alt2)) | |
6735 | then | |
6736 | return False; | |
6737 | end if; | |
6738 | ||
6739 | Next (Alt1); | |
6740 | Next (Alt2); | |
6741 | end loop; | |
6742 | end if; | |
6743 | end; | |
6744 | ||
996ae0b0 RK |
6745 | when N_Character_Literal => |
6746 | return | |
6747 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
6748 | ||
6749 | when N_Component_Association => | |
6750 | return | |
6751 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
6752 | and then |
6753 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
6754 | |
6755 | when N_Conditional_Expression => | |
6756 | return | |
6757 | FCL (Expressions (E1), Expressions (E2)); | |
6758 | ||
6759 | when N_Explicit_Dereference => | |
6760 | return | |
6761 | FCE (Prefix (E1), Prefix (E2)); | |
6762 | ||
6763 | when N_Extension_Aggregate => | |
6764 | return | |
6765 | FCL (Expressions (E1), Expressions (E2)) | |
6766 | and then Null_Record_Present (E1) = | |
6767 | Null_Record_Present (E2) | |
6768 | and then FCL (Component_Associations (E1), | |
6769 | Component_Associations (E2)); | |
6770 | ||
6771 | when N_Function_Call => | |
6772 | return | |
6773 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
6774 | and then |
6775 | FCL (Parameter_Associations (E1), | |
6776 | Parameter_Associations (E2)); | |
996ae0b0 RK |
6777 | |
6778 | when N_Indexed_Component => | |
6779 | return | |
6780 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
6781 | and then |
6782 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
6783 | |
6784 | when N_Integer_Literal => | |
6785 | return (Intval (E1) = Intval (E2)); | |
6786 | ||
6787 | when N_Null => | |
6788 | return True; | |
6789 | ||
6790 | when N_Operator_Symbol => | |
6791 | return | |
6792 | Chars (E1) = Chars (E2); | |
6793 | ||
6794 | when N_Others_Choice => | |
6795 | return True; | |
6796 | ||
6797 | when N_Parameter_Association => | |
6798 | return | |
996ae0b0 RK |
6799 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
6800 | and then FCE (Explicit_Actual_Parameter (E1), | |
6801 | Explicit_Actual_Parameter (E2)); | |
6802 | ||
6803 | when N_Qualified_Expression => | |
6804 | return | |
6805 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
6806 | and then |
6807 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 6808 | |
2010d078 AC |
6809 | when N_Quantified_Expression => |
6810 | if not FCE (Condition (E1), Condition (E2)) then | |
6811 | return False; | |
6812 | end if; | |
6813 | ||
6814 | if Present (Loop_Parameter_Specification (E1)) | |
6815 | and then Present (Loop_Parameter_Specification (E2)) | |
6816 | then | |
6817 | declare | |
6818 | L1 : constant Node_Id := | |
6819 | Loop_Parameter_Specification (E1); | |
6820 | L2 : constant Node_Id := | |
6821 | Loop_Parameter_Specification (E2); | |
6822 | ||
6823 | begin | |
6824 | return | |
6825 | Reverse_Present (L1) = Reverse_Present (L2) | |
6826 | and then | |
6827 | FCE (Defining_Identifier (L1), | |
6828 | Defining_Identifier (L2)) | |
6829 | and then | |
6830 | FCE (Discrete_Subtype_Definition (L1), | |
6831 | Discrete_Subtype_Definition (L2)); | |
6832 | end; | |
6833 | ||
6834 | else -- quantified expression with an iterator | |
6835 | declare | |
6836 | I1 : constant Node_Id := Iterator_Specification (E1); | |
6837 | I2 : constant Node_Id := Iterator_Specification (E2); | |
6838 | ||
6839 | begin | |
6840 | return | |
6841 | FCE (Defining_Identifier (I1), | |
6842 | Defining_Identifier (I2)) | |
6843 | and then | |
6844 | Of_Present (I1) = Of_Present (I2) | |
6845 | and then | |
6846 | Reverse_Present (I1) = Reverse_Present (I2) | |
6847 | and then FCE (Name (I1), Name (I2)) | |
6848 | and then FCE (Subtype_Indication (I1), | |
6849 | Subtype_Indication (I2)); | |
6850 | end; | |
6851 | end if; | |
6852 | ||
996ae0b0 RK |
6853 | when N_Range => |
6854 | return | |
6855 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
6856 | and then |
6857 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
6858 | |
6859 | when N_Real_Literal => | |
6860 | return (Realval (E1) = Realval (E2)); | |
6861 | ||
6862 | when N_Selected_Component => | |
6863 | return | |
6864 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
6865 | and then |
6866 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
6867 | |
6868 | when N_Slice => | |
6869 | return | |
6870 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
6871 | and then |
6872 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
6873 | |
6874 | when N_String_Literal => | |
6875 | declare | |
6876 | S1 : constant String_Id := Strval (E1); | |
6877 | S2 : constant String_Id := Strval (E2); | |
6878 | L1 : constant Nat := String_Length (S1); | |
6879 | L2 : constant Nat := String_Length (S2); | |
6880 | ||
6881 | begin | |
6882 | if L1 /= L2 then | |
6883 | return False; | |
6884 | ||
6885 | else | |
6886 | for J in 1 .. L1 loop | |
6887 | if Get_String_Char (S1, J) /= | |
6888 | Get_String_Char (S2, J) | |
6889 | then | |
6890 | return False; | |
6891 | end if; | |
6892 | end loop; | |
6893 | ||
6894 | return True; | |
6895 | end if; | |
6896 | end; | |
6897 | ||
6898 | when N_Type_Conversion => | |
6899 | return | |
6900 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
6901 | and then |
6902 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
6903 | |
6904 | when N_Unary_Op => | |
6905 | return | |
6906 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
6907 | and then |
6908 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
6909 | |
6910 | when N_Unchecked_Type_Conversion => | |
6911 | return | |
6912 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
6913 | and then |
6914 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
6915 | |
6916 | -- All other node types cannot appear in this context. Strictly | |
6917 | -- we should raise a fatal internal error. Instead we just ignore | |
6918 | -- the nodes. This means that if anyone makes a mistake in the | |
6919 | -- expander and mucks an expression tree irretrievably, the | |
6920 | -- result will be a failure to detect a (probably very obscure) | |
6921 | -- case of non-conformance, which is better than bombing on some | |
6922 | -- case where two expressions do in fact conform. | |
6923 | ||
6924 | when others => | |
6925 | return True; | |
6926 | ||
6927 | end case; | |
6928 | end if; | |
6929 | end Fully_Conformant_Expressions; | |
6930 | ||
fbf5a39b AC |
6931 | ---------------------------------------- |
6932 | -- Fully_Conformant_Discrete_Subtypes -- | |
6933 | ---------------------------------------- | |
6934 | ||
6935 | function Fully_Conformant_Discrete_Subtypes | |
6936 | (Given_S1 : Node_Id; | |
d05ef0ab | 6937 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
6938 | is |
6939 | S1 : constant Node_Id := Original_Node (Given_S1); | |
6940 | S2 : constant Node_Id := Original_Node (Given_S2); | |
6941 | ||
6942 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
6943 | -- Special-case for a bound given by a discriminant, which in the body |
6944 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
6945 | |
6946 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 6947 | -- Check both bounds |
fbf5a39b | 6948 | |
5d37ba92 ES |
6949 | ----------------------- |
6950 | -- Conforming_Bounds -- | |
6951 | ----------------------- | |
6952 | ||
fbf5a39b AC |
6953 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
6954 | begin | |
6955 | if Is_Entity_Name (B1) | |
6956 | and then Is_Entity_Name (B2) | |
6957 | and then Ekind (Entity (B1)) = E_Discriminant | |
6958 | then | |
6959 | return Chars (B1) = Chars (B2); | |
6960 | ||
6961 | else | |
6962 | return Fully_Conformant_Expressions (B1, B2); | |
6963 | end if; | |
6964 | end Conforming_Bounds; | |
6965 | ||
5d37ba92 ES |
6966 | ----------------------- |
6967 | -- Conforming_Ranges -- | |
6968 | ----------------------- | |
6969 | ||
fbf5a39b AC |
6970 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
6971 | begin | |
6972 | return | |
6973 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
6974 | and then | |
6975 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
6976 | end Conforming_Ranges; | |
6977 | ||
6978 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
6979 | ||
6980 | begin | |
6981 | if Nkind (S1) /= Nkind (S2) then | |
6982 | return False; | |
6983 | ||
6984 | elsif Is_Entity_Name (S1) then | |
6985 | return Entity (S1) = Entity (S2); | |
6986 | ||
6987 | elsif Nkind (S1) = N_Range then | |
6988 | return Conforming_Ranges (S1, S2); | |
6989 | ||
6990 | elsif Nkind (S1) = N_Subtype_Indication then | |
6991 | return | |
6992 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
6993 | and then | |
6994 | Conforming_Ranges | |
6995 | (Range_Expression (Constraint (S1)), | |
6996 | Range_Expression (Constraint (S2))); | |
6997 | else | |
6998 | return True; | |
6999 | end if; | |
7000 | end Fully_Conformant_Discrete_Subtypes; | |
7001 | ||
996ae0b0 RK |
7002 | -------------------- |
7003 | -- Install_Entity -- | |
7004 | -------------------- | |
7005 | ||
7006 | procedure Install_Entity (E : Entity_Id) is | |
7007 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
7008 | begin |
7009 | Set_Is_Immediately_Visible (E); | |
7010 | Set_Current_Entity (E); | |
7011 | Set_Homonym (E, Prev); | |
7012 | end Install_Entity; | |
7013 | ||
7014 | --------------------- | |
7015 | -- Install_Formals -- | |
7016 | --------------------- | |
7017 | ||
7018 | procedure Install_Formals (Id : Entity_Id) is | |
7019 | F : Entity_Id; | |
996ae0b0 RK |
7020 | begin |
7021 | F := First_Formal (Id); | |
996ae0b0 RK |
7022 | while Present (F) loop |
7023 | Install_Entity (F); | |
7024 | Next_Formal (F); | |
7025 | end loop; | |
7026 | end Install_Formals; | |
7027 | ||
ce2b6ba5 JM |
7028 | ----------------------------- |
7029 | -- Is_Interface_Conformant -- | |
7030 | ----------------------------- | |
7031 | ||
7032 | function Is_Interface_Conformant | |
7033 | (Tagged_Type : Entity_Id; | |
7034 | Iface_Prim : Entity_Id; | |
7035 | Prim : Entity_Id) return Boolean | |
7036 | is | |
fceeaab6 ES |
7037 | Iface : constant Entity_Id := Find_Dispatching_Type (Iface_Prim); |
7038 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); | |
7039 | ||
ce2b6ba5 JM |
7040 | begin |
7041 | pragma Assert (Is_Subprogram (Iface_Prim) | |
7042 | and then Is_Subprogram (Prim) | |
7043 | and then Is_Dispatching_Operation (Iface_Prim) | |
7044 | and then Is_Dispatching_Operation (Prim)); | |
7045 | ||
fceeaab6 | 7046 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
7047 | or else (Present (Alias (Iface_Prim)) |
7048 | and then | |
7049 | Is_Interface | |
7050 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
7051 | ||
7052 | if Prim = Iface_Prim | |
7053 | or else not Is_Subprogram (Prim) | |
7054 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
7055 | or else not Is_Dispatching_Operation (Prim) | |
7056 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 ES |
7057 | or else No (Typ) |
7058 | or else Base_Type (Typ) /= Tagged_Type | |
ce2b6ba5 JM |
7059 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
7060 | then | |
7061 | return False; | |
7062 | ||
fceeaab6 ES |
7063 | -- Case of a procedure, or a function that does not have a controlling |
7064 | -- result (I or access I). | |
ce2b6ba5 JM |
7065 | |
7066 | elsif Ekind (Iface_Prim) = E_Procedure | |
7067 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 7068 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 7069 | then |
b4d7b435 AC |
7070 | return Type_Conformant |
7071 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 7072 | |
fceeaab6 ES |
7073 | -- Case of a function returning an interface, or an access to one. |
7074 | -- Check that the return types correspond. | |
ce2b6ba5 | 7075 | |
fceeaab6 ES |
7076 | elsif Implements_Interface (Typ, Iface) then |
7077 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
7078 | /= |
7079 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
7080 | then |
7081 | return False; | |
fceeaab6 ES |
7082 | else |
7083 | return | |
ce2b6ba5 JM |
7084 | Type_Conformant (Prim, Iface_Prim, |
7085 | Skip_Controlling_Formals => True); | |
fceeaab6 | 7086 | end if; |
ce2b6ba5 | 7087 | |
fceeaab6 ES |
7088 | else |
7089 | return False; | |
ce2b6ba5 | 7090 | end if; |
ce2b6ba5 JM |
7091 | end Is_Interface_Conformant; |
7092 | ||
996ae0b0 RK |
7093 | --------------------------------- |
7094 | -- Is_Non_Overriding_Operation -- | |
7095 | --------------------------------- | |
7096 | ||
7097 | function Is_Non_Overriding_Operation | |
7098 | (Prev_E : Entity_Id; | |
d05ef0ab | 7099 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
7100 | is |
7101 | Formal : Entity_Id; | |
7102 | F_Typ : Entity_Id; | |
7103 | G_Typ : Entity_Id := Empty; | |
7104 | ||
7105 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
7106 | -- If F_Type is a derived type associated with a generic actual subtype, |
7107 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
7108 | |
7109 | function Types_Correspond | |
7110 | (P_Type : Entity_Id; | |
d05ef0ab | 7111 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
7112 | -- Returns true if and only if the types (or designated types in the |
7113 | -- case of anonymous access types) are the same or N_Type is derived | |
7114 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
7115 | |
7116 | ----------------------------- | |
7117 | -- Get_Generic_Parent_Type -- | |
7118 | ----------------------------- | |
7119 | ||
7120 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
7121 | G_Typ : Entity_Id; | |
7122 | Indic : Node_Id; | |
7123 | ||
7124 | begin | |
7125 | if Is_Derived_Type (F_Typ) | |
7126 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
7127 | then | |
82c80734 RD |
7128 | -- The tree must be traversed to determine the parent subtype in |
7129 | -- the generic unit, which unfortunately isn't always available | |
7130 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
7131 | -- is needed for cases where a full derived type has been | |
7132 | -- rewritten.) | |
996ae0b0 RK |
7133 | |
7134 | Indic := Subtype_Indication | |
7135 | (Type_Definition (Original_Node (Parent (F_Typ)))); | |
7136 | ||
7137 | if Nkind (Indic) = N_Subtype_Indication then | |
7138 | G_Typ := Entity (Subtype_Mark (Indic)); | |
7139 | else | |
7140 | G_Typ := Entity (Indic); | |
7141 | end if; | |
7142 | ||
7143 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration | |
7144 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
7145 | then | |
7146 | return Generic_Parent_Type (Parent (G_Typ)); | |
7147 | end if; | |
7148 | end if; | |
7149 | ||
7150 | return Empty; | |
7151 | end Get_Generic_Parent_Type; | |
7152 | ||
7153 | ---------------------- | |
7154 | -- Types_Correspond -- | |
7155 | ---------------------- | |
7156 | ||
7157 | function Types_Correspond | |
7158 | (P_Type : Entity_Id; | |
d05ef0ab | 7159 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
7160 | is |
7161 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
7162 | New_Type : Entity_Id := Base_Type (N_Type); | |
7163 | ||
7164 | begin | |
7165 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
7166 | Prev_Type := Designated_Type (Prev_Type); | |
7167 | end if; | |
7168 | ||
7169 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
7170 | New_Type := Designated_Type (New_Type); | |
7171 | end if; | |
7172 | ||
7173 | if Prev_Type = New_Type then | |
7174 | return True; | |
7175 | ||
7176 | elsif not Is_Class_Wide_Type (New_Type) then | |
7177 | while Etype (New_Type) /= New_Type loop | |
7178 | New_Type := Etype (New_Type); | |
7179 | if New_Type = Prev_Type then | |
7180 | return True; | |
7181 | end if; | |
7182 | end loop; | |
7183 | end if; | |
7184 | return False; | |
7185 | end Types_Correspond; | |
7186 | ||
7187 | -- Start of processing for Is_Non_Overriding_Operation | |
7188 | ||
7189 | begin | |
82c80734 RD |
7190 | -- In the case where both operations are implicit derived subprograms |
7191 | -- then neither overrides the other. This can only occur in certain | |
7192 | -- obscure cases (e.g., derivation from homographs created in a generic | |
7193 | -- instantiation). | |
996ae0b0 RK |
7194 | |
7195 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
7196 | return True; | |
7197 | ||
7198 | elsif Ekind (Current_Scope) = E_Package | |
7199 | and then Is_Generic_Instance (Current_Scope) | |
7200 | and then In_Private_Part (Current_Scope) | |
7201 | and then Comes_From_Source (New_E) | |
7202 | then | |
7203 | -- We examine the formals and result subtype of the inherited | |
82c80734 RD |
7204 | -- operation, to determine whether their type is derived from (the |
7205 | -- instance of) a generic type. | |
996ae0b0 RK |
7206 | |
7207 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
7208 | while Present (Formal) loop |
7209 | F_Typ := Base_Type (Etype (Formal)); | |
7210 | ||
7211 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
7212 | F_Typ := Designated_Type (F_Typ); | |
7213 | end if; | |
7214 | ||
7215 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
7216 | ||
7217 | Next_Formal (Formal); | |
7218 | end loop; | |
7219 | ||
c8ef728f | 7220 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
7221 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
7222 | end if; | |
7223 | ||
7224 | if No (G_Typ) then | |
7225 | return False; | |
7226 | end if; | |
7227 | ||
8dbd1460 AC |
7228 | -- If the generic type is a private type, then the original operation |
7229 | -- was not overriding in the generic, because there was no primitive | |
7230 | -- operation to override. | |
996ae0b0 RK |
7231 | |
7232 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
7233 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 7234 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
7235 | then |
7236 | return True; | |
7237 | ||
7238 | -- The generic parent type is the ancestor of a formal derived | |
7239 | -- type declaration. We need to check whether it has a primitive | |
7240 | -- operation that should be overridden by New_E in the generic. | |
7241 | ||
7242 | else | |
7243 | declare | |
7244 | P_Formal : Entity_Id; | |
7245 | N_Formal : Entity_Id; | |
7246 | P_Typ : Entity_Id; | |
7247 | N_Typ : Entity_Id; | |
7248 | P_Prim : Entity_Id; | |
7249 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
7250 | ||
7251 | begin | |
7252 | while Present (Prim_Elt) loop | |
7253 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 7254 | |
996ae0b0 RK |
7255 | if Chars (P_Prim) = Chars (New_E) |
7256 | and then Ekind (P_Prim) = Ekind (New_E) | |
7257 | then | |
7258 | P_Formal := First_Formal (P_Prim); | |
7259 | N_Formal := First_Formal (New_E); | |
7260 | while Present (P_Formal) and then Present (N_Formal) loop | |
7261 | P_Typ := Etype (P_Formal); | |
7262 | N_Typ := Etype (N_Formal); | |
7263 | ||
7264 | if not Types_Correspond (P_Typ, N_Typ) then | |
7265 | exit; | |
7266 | end if; | |
7267 | ||
7268 | Next_Entity (P_Formal); | |
7269 | Next_Entity (N_Formal); | |
7270 | end loop; | |
7271 | ||
82c80734 RD |
7272 | -- Found a matching primitive operation belonging to the |
7273 | -- formal ancestor type, so the new subprogram is | |
7274 | -- overriding. | |
996ae0b0 | 7275 | |
c8ef728f ES |
7276 | if No (P_Formal) |
7277 | and then No (N_Formal) | |
996ae0b0 RK |
7278 | and then (Ekind (New_E) /= E_Function |
7279 | or else | |
7280 | Types_Correspond | |
7281 | (Etype (P_Prim), Etype (New_E))) | |
7282 | then | |
7283 | return False; | |
7284 | end if; | |
7285 | end if; | |
7286 | ||
7287 | Next_Elmt (Prim_Elt); | |
7288 | end loop; | |
7289 | ||
82c80734 RD |
7290 | -- If no match found, then the new subprogram does not |
7291 | -- override in the generic (nor in the instance). | |
996ae0b0 RK |
7292 | |
7293 | return True; | |
7294 | end; | |
7295 | end if; | |
7296 | else | |
7297 | return False; | |
7298 | end if; | |
7299 | end Is_Non_Overriding_Operation; | |
7300 | ||
beacce02 AC |
7301 | ------------------------------------- |
7302 | -- List_Inherited_Pre_Post_Aspects -- | |
7303 | ------------------------------------- | |
7304 | ||
7305 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
7306 | begin | |
e606088a | 7307 | if Opt.List_Inherited_Aspects |
beacce02 AC |
7308 | and then (Is_Subprogram (E) or else Is_Generic_Subprogram (E)) |
7309 | then | |
7310 | declare | |
7311 | Inherited : constant Subprogram_List := | |
7312 | Inherited_Subprograms (E); | |
7313 | P : Node_Id; | |
7314 | ||
7315 | begin | |
7316 | for J in Inherited'Range loop | |
dac3bede YM |
7317 | P := Spec_PPC_List (Contract (Inherited (J))); |
7318 | ||
beacce02 AC |
7319 | while Present (P) loop |
7320 | Error_Msg_Sloc := Sloc (P); | |
7321 | ||
7322 | if Class_Present (P) and then not Split_PPC (P) then | |
7323 | if Pragma_Name (P) = Name_Precondition then | |
7324 | Error_Msg_N | |
7325 | ("?info: & inherits `Pre''Class` aspect from #", E); | |
7326 | else | |
7327 | Error_Msg_N | |
7328 | ("?info: & inherits `Post''Class` aspect from #", E); | |
7329 | end if; | |
7330 | end if; | |
7331 | ||
7332 | P := Next_Pragma (P); | |
7333 | end loop; | |
7334 | end loop; | |
7335 | end; | |
7336 | end if; | |
7337 | end List_Inherited_Pre_Post_Aspects; | |
7338 | ||
996ae0b0 RK |
7339 | ------------------------------ |
7340 | -- Make_Inequality_Operator -- | |
7341 | ------------------------------ | |
7342 | ||
7343 | -- S is the defining identifier of an equality operator. We build a | |
7344 | -- subprogram declaration with the right signature. This operation is | |
7345 | -- intrinsic, because it is always expanded as the negation of the | |
7346 | -- call to the equality function. | |
7347 | ||
7348 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
7349 | Loc : constant Source_Ptr := Sloc (S); | |
7350 | Decl : Node_Id; | |
7351 | Formals : List_Id; | |
7352 | Op_Name : Entity_Id; | |
7353 | ||
c8ef728f ES |
7354 | FF : constant Entity_Id := First_Formal (S); |
7355 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
7356 | |
7357 | begin | |
c8ef728f | 7358 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 7359 | |
c8ef728f | 7360 | if No (NF) then |
996ae0b0 RK |
7361 | return; |
7362 | end if; | |
7363 | ||
c8ef728f ES |
7364 | declare |
7365 | A : constant Entity_Id := | |
7366 | Make_Defining_Identifier (Sloc (FF), | |
7367 | Chars => Chars (FF)); | |
7368 | ||
5d37ba92 ES |
7369 | B : constant Entity_Id := |
7370 | Make_Defining_Identifier (Sloc (NF), | |
7371 | Chars => Chars (NF)); | |
c8ef728f ES |
7372 | |
7373 | begin | |
7374 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
7375 | ||
7376 | Formals := New_List ( | |
7377 | Make_Parameter_Specification (Loc, | |
7378 | Defining_Identifier => A, | |
7379 | Parameter_Type => | |
7380 | New_Reference_To (Etype (First_Formal (S)), | |
7381 | Sloc (Etype (First_Formal (S))))), | |
7382 | ||
7383 | Make_Parameter_Specification (Loc, | |
7384 | Defining_Identifier => B, | |
7385 | Parameter_Type => | |
7386 | New_Reference_To (Etype (Next_Formal (First_Formal (S))), | |
7387 | Sloc (Etype (Next_Formal (First_Formal (S))))))); | |
7388 | ||
7389 | Decl := | |
7390 | Make_Subprogram_Declaration (Loc, | |
7391 | Specification => | |
7392 | Make_Function_Specification (Loc, | |
7393 | Defining_Unit_Name => Op_Name, | |
7394 | Parameter_Specifications => Formals, | |
7395 | Result_Definition => | |
7396 | New_Reference_To (Standard_Boolean, Loc))); | |
7397 | ||
7398 | -- Insert inequality right after equality if it is explicit or after | |
7399 | -- the derived type when implicit. These entities are created only | |
7400 | -- for visibility purposes, and eventually replaced in the course of | |
7401 | -- expansion, so they do not need to be attached to the tree and seen | |
7402 | -- by the back-end. Keeping them internal also avoids spurious | |
7403 | -- freezing problems. The declaration is inserted in the tree for | |
7404 | -- analysis, and removed afterwards. If the equality operator comes | |
7405 | -- from an explicit declaration, attach the inequality immediately | |
7406 | -- after. Else the equality is inherited from a derived type | |
7407 | -- declaration, so insert inequality after that declaration. | |
7408 | ||
7409 | if No (Alias (S)) then | |
7410 | Insert_After (Unit_Declaration_Node (S), Decl); | |
7411 | elsif Is_List_Member (Parent (S)) then | |
7412 | Insert_After (Parent (S), Decl); | |
7413 | else | |
7414 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
7415 | end if; | |
996ae0b0 | 7416 | |
c8ef728f ES |
7417 | Mark_Rewrite_Insertion (Decl); |
7418 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
7419 | Analyze (Decl); | |
7420 | Remove (Decl); | |
7421 | Set_Has_Completion (Op_Name); | |
7422 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 7423 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 7424 | end; |
996ae0b0 RK |
7425 | end Make_Inequality_Operator; |
7426 | ||
7427 | ---------------------- | |
7428 | -- May_Need_Actuals -- | |
7429 | ---------------------- | |
7430 | ||
7431 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
7432 | F : Entity_Id; | |
7433 | B : Boolean; | |
7434 | ||
7435 | begin | |
7436 | F := First_Formal (Fun); | |
7437 | B := True; | |
996ae0b0 RK |
7438 | while Present (F) loop |
7439 | if No (Default_Value (F)) then | |
7440 | B := False; | |
7441 | exit; | |
7442 | end if; | |
7443 | ||
7444 | Next_Formal (F); | |
7445 | end loop; | |
7446 | ||
7447 | Set_Needs_No_Actuals (Fun, B); | |
7448 | end May_Need_Actuals; | |
7449 | ||
7450 | --------------------- | |
7451 | -- Mode_Conformant -- | |
7452 | --------------------- | |
7453 | ||
7454 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
7455 | Result : Boolean; | |
996ae0b0 RK |
7456 | begin |
7457 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
7458 | return Result; | |
7459 | end Mode_Conformant; | |
7460 | ||
7461 | --------------------------- | |
7462 | -- New_Overloaded_Entity -- | |
7463 | --------------------------- | |
7464 | ||
7465 | procedure New_Overloaded_Entity | |
7466 | (S : Entity_Id; | |
7467 | Derived_Type : Entity_Id := Empty) | |
7468 | is | |
ec4867fa | 7469 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
7470 | -- Set if the current scope has an operation that is type-conformant |
7471 | -- with S, and becomes hidden by S. | |
7472 | ||
5d37ba92 ES |
7473 | Is_Primitive_Subp : Boolean; |
7474 | -- Set to True if the new subprogram is primitive | |
7475 | ||
fbf5a39b AC |
7476 | E : Entity_Id; |
7477 | -- Entity that S overrides | |
7478 | ||
996ae0b0 | 7479 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
7480 | -- Predecessor of E in Homonym chain |
7481 | ||
5d37ba92 ES |
7482 | procedure Check_For_Primitive_Subprogram |
7483 | (Is_Primitive : out Boolean; | |
7484 | Is_Overriding : Boolean := False); | |
7485 | -- If the subprogram being analyzed is a primitive operation of the type | |
7486 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
7487 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
7488 | -- corresponding flag on the entity itself for later use. | |
7489 | ||
ec4867fa ES |
7490 | procedure Check_Synchronized_Overriding |
7491 | (Def_Id : Entity_Id; | |
ec4867fa ES |
7492 | Overridden_Subp : out Entity_Id); |
7493 | -- First determine if Def_Id is an entry or a subprogram either defined | |
7494 | -- in the scope of a task or protected type, or is a primitive of such | |
7495 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
7496 | -- implemented by the synchronized type, return the overridden entity | |
7497 | -- or Empty. | |
758c442c | 7498 | |
996ae0b0 RK |
7499 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
7500 | -- Check that E is declared in the private part of the current package, | |
7501 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 7502 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
7503 | -- set when freezing entities, so we must examine the place of the |
7504 | -- declaration in the tree, and recognize wrapper packages as well. | |
7505 | ||
2ddc2000 AC |
7506 | function Is_Overriding_Alias |
7507 | (Old_E : Entity_Id; | |
7508 | New_E : Entity_Id) return Boolean; | |
7509 | -- Check whether new subprogram and old subprogram are both inherited | |
7510 | -- from subprograms that have distinct dispatch table entries. This can | |
7511 | -- occur with derivations from instances with accidental homonyms. | |
7512 | -- The function is conservative given that the converse is only true | |
7513 | -- within instances that contain accidental overloadings. | |
7514 | ||
5d37ba92 ES |
7515 | ------------------------------------ |
7516 | -- Check_For_Primitive_Subprogram -- | |
7517 | ------------------------------------ | |
996ae0b0 | 7518 | |
5d37ba92 ES |
7519 | procedure Check_For_Primitive_Subprogram |
7520 | (Is_Primitive : out Boolean; | |
7521 | Is_Overriding : Boolean := False) | |
ec4867fa | 7522 | is |
996ae0b0 RK |
7523 | Formal : Entity_Id; |
7524 | F_Typ : Entity_Id; | |
07fc65c4 | 7525 | B_Typ : Entity_Id; |
996ae0b0 RK |
7526 | |
7527 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
7528 | -- Returns true if T is declared in the visible part of the current |
7529 | -- package scope; otherwise returns false. Assumes that T is declared | |
7530 | -- in a package. | |
996ae0b0 RK |
7531 | |
7532 | procedure Check_Private_Overriding (T : Entity_Id); | |
7533 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
7534 | -- abstract type is declared in a private part, then it must override |
7535 | -- an abstract subprogram declared in the visible part. Also checks | |
7536 | -- that if a primitive function with a controlling result is declared | |
7537 | -- in a private part, then it must override a function declared in | |
7538 | -- the visible part. | |
996ae0b0 RK |
7539 | |
7540 | ------------------------------ | |
7541 | -- Check_Private_Overriding -- | |
7542 | ------------------------------ | |
7543 | ||
7544 | procedure Check_Private_Overriding (T : Entity_Id) is | |
7545 | begin | |
51c16e29 | 7546 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
7547 | and then In_Private_Part (Current_Scope) |
7548 | and then Visible_Part_Type (T) | |
7549 | and then not In_Instance | |
7550 | then | |
f937473f RD |
7551 | if Is_Abstract_Type (T) |
7552 | and then Is_Abstract_Subprogram (S) | |
7553 | and then (not Is_Overriding | |
8dbd1460 | 7554 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 7555 | then |
ed2233dc | 7556 | Error_Msg_N |
19d846a0 RD |
7557 | ("abstract subprograms must be visible " |
7558 | & "(RM 3.9.3(10))!", S); | |
758c442c | 7559 | |
996ae0b0 | 7560 | elsif Ekind (S) = E_Function |
82c80734 | 7561 | and then not Is_Overriding |
996ae0b0 | 7562 | then |
2e79de51 AC |
7563 | if Is_Tagged_Type (T) |
7564 | and then T = Base_Type (Etype (S)) | |
7565 | then | |
7566 | Error_Msg_N | |
7567 | ("private function with tagged result must" | |
7568 | & " override visible-part function", S); | |
7569 | Error_Msg_N | |
7570 | ("\move subprogram to the visible part" | |
7571 | & " (RM 3.9.3(10))", S); | |
7572 | ||
7573 | -- AI05-0073: extend this test to the case of a function | |
7574 | -- with a controlling access result. | |
7575 | ||
7576 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
7577 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
7578 | and then | |
7579 | not Is_Class_Wide_Type (Designated_Type (Etype (S))) | |
dbe945f1 | 7580 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
7581 | then |
7582 | Error_Msg_N | |
7583 | ("private function with controlling access result " | |
7584 | & "must override visible-part function", S); | |
7585 | Error_Msg_N | |
7586 | ("\move subprogram to the visible part" | |
7587 | & " (RM 3.9.3(10))", S); | |
7588 | end if; | |
996ae0b0 RK |
7589 | end if; |
7590 | end if; | |
7591 | end Check_Private_Overriding; | |
7592 | ||
7593 | ----------------------- | |
7594 | -- Visible_Part_Type -- | |
7595 | ----------------------- | |
7596 | ||
7597 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
7598 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
7599 | N : Node_Id; | |
996ae0b0 RK |
7600 | |
7601 | begin | |
8dbd1460 AC |
7602 | -- If the entity is a private type, then it must be declared in a |
7603 | -- visible part. | |
996ae0b0 RK |
7604 | |
7605 | if Ekind (T) in Private_Kind then | |
7606 | return True; | |
7607 | end if; | |
7608 | ||
7609 | -- Otherwise, we traverse the visible part looking for its | |
7610 | -- corresponding declaration. We cannot use the declaration | |
7611 | -- node directly because in the private part the entity of a | |
7612 | -- private type is the one in the full view, which does not | |
7613 | -- indicate that it is the completion of something visible. | |
7614 | ||
07fc65c4 | 7615 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
7616 | while Present (N) loop |
7617 | if Nkind (N) = N_Full_Type_Declaration | |
7618 | and then Present (Defining_Identifier (N)) | |
7619 | and then T = Defining_Identifier (N) | |
7620 | then | |
7621 | return True; | |
7622 | ||
800621e0 RD |
7623 | elsif Nkind_In (N, N_Private_Type_Declaration, |
7624 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
7625 | and then Present (Defining_Identifier (N)) |
7626 | and then T = Full_View (Defining_Identifier (N)) | |
7627 | then | |
7628 | return True; | |
7629 | end if; | |
7630 | ||
7631 | Next (N); | |
7632 | end loop; | |
7633 | ||
7634 | return False; | |
7635 | end Visible_Part_Type; | |
7636 | ||
5d37ba92 | 7637 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
7638 | |
7639 | begin | |
5d37ba92 ES |
7640 | Is_Primitive := False; |
7641 | ||
996ae0b0 RK |
7642 | if not Comes_From_Source (S) then |
7643 | null; | |
7644 | ||
5d37ba92 | 7645 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
7646 | |
7647 | elsif Current_Scope = Standard_Standard then | |
7648 | null; | |
7649 | ||
b9b2405f | 7650 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 7651 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 7652 | or else Is_Overriding |
996ae0b0 | 7653 | then |
07fc65c4 | 7654 | -- For function, check return type |
996ae0b0 | 7655 | |
07fc65c4 | 7656 | if Ekind (S) = E_Function then |
5d37ba92 ES |
7657 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
7658 | F_Typ := Designated_Type (Etype (S)); | |
7659 | else | |
7660 | F_Typ := Etype (S); | |
7661 | end if; | |
7662 | ||
7663 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 7664 | |
5d37ba92 ES |
7665 | if Scope (B_Typ) = Current_Scope |
7666 | and then not Is_Class_Wide_Type (B_Typ) | |
7667 | and then not Is_Generic_Type (B_Typ) | |
7668 | then | |
7669 | Is_Primitive := True; | |
07fc65c4 | 7670 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 7671 | Set_Is_Primitive (S); |
07fc65c4 GB |
7672 | Check_Private_Overriding (B_Typ); |
7673 | end if; | |
996ae0b0 RK |
7674 | end if; |
7675 | ||
07fc65c4 | 7676 | -- For all subprograms, check formals |
996ae0b0 | 7677 | |
07fc65c4 | 7678 | Formal := First_Formal (S); |
996ae0b0 RK |
7679 | while Present (Formal) loop |
7680 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
7681 | F_Typ := Designated_Type (Etype (Formal)); | |
7682 | else | |
7683 | F_Typ := Etype (Formal); | |
7684 | end if; | |
7685 | ||
07fc65c4 GB |
7686 | B_Typ := Base_Type (F_Typ); |
7687 | ||
ec4867fa ES |
7688 | if Ekind (B_Typ) = E_Access_Subtype then |
7689 | B_Typ := Base_Type (B_Typ); | |
7690 | end if; | |
7691 | ||
5d37ba92 ES |
7692 | if Scope (B_Typ) = Current_Scope |
7693 | and then not Is_Class_Wide_Type (B_Typ) | |
7694 | and then not Is_Generic_Type (B_Typ) | |
7695 | then | |
7696 | Is_Primitive := True; | |
7697 | Set_Is_Primitive (S); | |
07fc65c4 GB |
7698 | Set_Has_Primitive_Operations (B_Typ); |
7699 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
7700 | end if; |
7701 | ||
7702 | Next_Formal (Formal); | |
7703 | end loop; | |
996ae0b0 | 7704 | end if; |
5d37ba92 ES |
7705 | end Check_For_Primitive_Subprogram; |
7706 | ||
7707 | ----------------------------------- | |
7708 | -- Check_Synchronized_Overriding -- | |
7709 | ----------------------------------- | |
7710 | ||
7711 | procedure Check_Synchronized_Overriding | |
7712 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
7713 | Overridden_Subp : out Entity_Id) |
7714 | is | |
5d37ba92 ES |
7715 | Ifaces_List : Elist_Id; |
7716 | In_Scope : Boolean; | |
7717 | Typ : Entity_Id; | |
7718 | ||
8aa15e3b JM |
7719 | function Matches_Prefixed_View_Profile |
7720 | (Prim_Params : List_Id; | |
7721 | Iface_Params : List_Id) return Boolean; | |
7722 | -- Determine whether a subprogram's parameter profile Prim_Params | |
7723 | -- matches that of a potentially overridden interface subprogram | |
7724 | -- Iface_Params. Also determine if the type of first parameter of | |
7725 | -- Iface_Params is an implemented interface. | |
7726 | ||
8aa15e3b JM |
7727 | ----------------------------------- |
7728 | -- Matches_Prefixed_View_Profile -- | |
7729 | ----------------------------------- | |
7730 | ||
7731 | function Matches_Prefixed_View_Profile | |
7732 | (Prim_Params : List_Id; | |
7733 | Iface_Params : List_Id) return Boolean | |
7734 | is | |
7735 | Iface_Id : Entity_Id; | |
7736 | Iface_Param : Node_Id; | |
7737 | Iface_Typ : Entity_Id; | |
7738 | Prim_Id : Entity_Id; | |
7739 | Prim_Param : Node_Id; | |
7740 | Prim_Typ : Entity_Id; | |
7741 | ||
7742 | function Is_Implemented | |
7743 | (Ifaces_List : Elist_Id; | |
7744 | Iface : Entity_Id) return Boolean; | |
7745 | -- Determine if Iface is implemented by the current task or | |
7746 | -- protected type. | |
7747 | ||
7748 | -------------------- | |
7749 | -- Is_Implemented -- | |
7750 | -------------------- | |
7751 | ||
7752 | function Is_Implemented | |
7753 | (Ifaces_List : Elist_Id; | |
7754 | Iface : Entity_Id) return Boolean | |
7755 | is | |
7756 | Iface_Elmt : Elmt_Id; | |
7757 | ||
7758 | begin | |
7759 | Iface_Elmt := First_Elmt (Ifaces_List); | |
7760 | while Present (Iface_Elmt) loop | |
7761 | if Node (Iface_Elmt) = Iface then | |
7762 | return True; | |
7763 | end if; | |
7764 | ||
7765 | Next_Elmt (Iface_Elmt); | |
7766 | end loop; | |
7767 | ||
7768 | return False; | |
7769 | end Is_Implemented; | |
7770 | ||
7771 | -- Start of processing for Matches_Prefixed_View_Profile | |
7772 | ||
7773 | begin | |
7774 | Iface_Param := First (Iface_Params); | |
7775 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
7776 | ||
7777 | if Is_Access_Type (Iface_Typ) then | |
7778 | Iface_Typ := Designated_Type (Iface_Typ); | |
7779 | end if; | |
7780 | ||
7781 | Prim_Param := First (Prim_Params); | |
7782 | ||
7783 | -- The first parameter of the potentially overridden subprogram | |
7784 | -- must be an interface implemented by Prim. | |
7785 | ||
7786 | if not Is_Interface (Iface_Typ) | |
7787 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
7788 | then | |
7789 | return False; | |
7790 | end if; | |
7791 | ||
7792 | -- The checks on the object parameters are done, move onto the | |
7793 | -- rest of the parameters. | |
7794 | ||
7795 | if not In_Scope then | |
7796 | Prim_Param := Next (Prim_Param); | |
7797 | end if; | |
7798 | ||
7799 | Iface_Param := Next (Iface_Param); | |
7800 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
7801 | Iface_Id := Defining_Identifier (Iface_Param); | |
7802 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
7803 | ||
8aa15e3b JM |
7804 | Prim_Id := Defining_Identifier (Prim_Param); |
7805 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
7806 | ||
15e4986c JM |
7807 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
7808 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
7809 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
7810 | then | |
7811 | Iface_Typ := Designated_Type (Iface_Typ); | |
7812 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
7813 | end if; |
7814 | ||
7815 | -- Case of multiple interface types inside a parameter profile | |
7816 | ||
7817 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
7818 | ||
7819 | -- If the interface type is implemented, then the matching type | |
7820 | -- in the primitive should be the implementing record type. | |
7821 | ||
7822 | if Ekind (Iface_Typ) = E_Record_Type | |
7823 | and then Is_Interface (Iface_Typ) | |
7824 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
7825 | then | |
7826 | if Prim_Typ /= Typ then | |
7827 | return False; | |
7828 | end if; | |
7829 | ||
7830 | -- The two parameters must be both mode and subtype conformant | |
7831 | ||
7832 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
7833 | or else not | |
7834 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
7835 | then | |
7836 | return False; | |
7837 | end if; | |
7838 | ||
7839 | Next (Iface_Param); | |
7840 | Next (Prim_Param); | |
7841 | end loop; | |
7842 | ||
7843 | -- One of the two lists contains more parameters than the other | |
7844 | ||
7845 | if Present (Iface_Param) or else Present (Prim_Param) then | |
7846 | return False; | |
7847 | end if; | |
7848 | ||
7849 | return True; | |
7850 | end Matches_Prefixed_View_Profile; | |
7851 | ||
7852 | -- Start of processing for Check_Synchronized_Overriding | |
7853 | ||
5d37ba92 ES |
7854 | begin |
7855 | Overridden_Subp := Empty; | |
7856 | ||
8aa15e3b JM |
7857 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
7858 | -- primitives internally generated by the frontend; however at this | |
7859 | -- stage predefined primitives are still not fully decorated. As a | |
7860 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 7861 | |
8aa15e3b JM |
7862 | if (Ekind (Def_Id) /= E_Entry |
7863 | and then Ekind (Def_Id) /= E_Function | |
7864 | and then Ekind (Def_Id) /= E_Procedure) | |
7865 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
7866 | then |
7867 | return; | |
7868 | end if; | |
7869 | ||
7870 | -- Search for the concurrent declaration since it contains the list | |
7871 | -- of all implemented interfaces. In this case, the subprogram is | |
7872 | -- declared within the scope of a protected or a task type. | |
7873 | ||
7874 | if Present (Scope (Def_Id)) | |
7875 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
7876 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
7877 | then | |
7878 | Typ := Scope (Def_Id); | |
7879 | In_Scope := True; | |
7880 | ||
8aa15e3b | 7881 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 7882 | -- has no formals. |
8aa15e3b JM |
7883 | |
7884 | elsif No (First_Formal (Def_Id)) then | |
7885 | return; | |
5d37ba92 | 7886 | |
8aa15e3b | 7887 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 7888 | -- concurrent type. |
5d37ba92 | 7889 | |
8aa15e3b JM |
7890 | else |
7891 | Typ := Etype (First_Formal (Def_Id)); | |
7892 | ||
7893 | if Is_Access_Type (Typ) then | |
7894 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
7895 | end if; |
7896 | ||
8aa15e3b JM |
7897 | if Is_Concurrent_Type (Typ) |
7898 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 7899 | then |
5d37ba92 ES |
7900 | In_Scope := False; |
7901 | ||
7902 | -- This case occurs when the concurrent type is declared within | |
7903 | -- a generic unit. As a result the corresponding record has been | |
7904 | -- built and used as the type of the first formal, we just have | |
7905 | -- to retrieve the corresponding concurrent type. | |
7906 | ||
8aa15e3b JM |
7907 | elsif Is_Concurrent_Record_Type (Typ) |
7908 | and then Present (Corresponding_Concurrent_Type (Typ)) | |
5d37ba92 | 7909 | then |
8aa15e3b | 7910 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
7911 | In_Scope := False; |
7912 | ||
7913 | else | |
7914 | return; | |
7915 | end if; | |
8aa15e3b JM |
7916 | end if; |
7917 | ||
7918 | -- There is no overriding to check if is an inherited operation in a | |
7919 | -- type derivation on for a generic actual. | |
7920 | ||
7921 | Collect_Interfaces (Typ, Ifaces_List); | |
7922 | ||
7923 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
7924 | return; |
7925 | end if; | |
7926 | ||
8aa15e3b JM |
7927 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
7928 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 7929 | |
8aa15e3b JM |
7930 | declare |
7931 | Candidate : Entity_Id := Empty; | |
7932 | Hom : Entity_Id := Empty; | |
7933 | Iface_Typ : Entity_Id; | |
7934 | Subp : Entity_Id := Empty; | |
7935 | ||
7936 | begin | |
4adf3c50 | 7937 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
7938 | -- overridden subprogram that belongs to an implemented |
7939 | -- interface. | |
7940 | ||
7941 | Hom := Current_Entity_In_Scope (Def_Id); | |
7942 | while Present (Hom) loop | |
7943 | Subp := Hom; | |
7944 | ||
15e4986c JM |
7945 | if Subp = Def_Id |
7946 | or else not Is_Overloadable (Subp) | |
7947 | or else not Is_Primitive (Subp) | |
7948 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 7949 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 7950 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 7951 | then |
15e4986c | 7952 | null; |
8aa15e3b | 7953 | |
15e4986c | 7954 | -- Entries and procedures can override abstract or null |
4adf3c50 | 7955 | -- interface procedures. |
8aa15e3b | 7956 | |
15e4986c JM |
7957 | elsif (Ekind (Def_Id) = E_Procedure |
7958 | or else Ekind (Def_Id) = E_Entry) | |
8aa15e3b | 7959 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
7960 | and then Matches_Prefixed_View_Profile |
7961 | (Parameter_Specifications (Parent (Def_Id)), | |
7962 | Parameter_Specifications (Parent (Subp))) | |
7963 | then | |
7964 | Candidate := Subp; | |
7965 | ||
15e4986c JM |
7966 | -- For an overridden subprogram Subp, check whether the mode |
7967 | -- of its first parameter is correct depending on the kind | |
7968 | -- of synchronized type. | |
8aa15e3b | 7969 | |
15e4986c JM |
7970 | declare |
7971 | Formal : constant Node_Id := First_Formal (Candidate); | |
7972 | ||
7973 | begin | |
7974 | -- In order for an entry or a protected procedure to | |
7975 | -- override, the first parameter of the overridden | |
7976 | -- routine must be of mode "out", "in out" or | |
7977 | -- access-to-variable. | |
7978 | ||
7979 | if (Ekind (Candidate) = E_Entry | |
7980 | or else Ekind (Candidate) = E_Procedure) | |
7981 | and then Is_Protected_Type (Typ) | |
7982 | and then Ekind (Formal) /= E_In_Out_Parameter | |
7983 | and then Ekind (Formal) /= E_Out_Parameter | |
7984 | and then Nkind (Parameter_Type (Parent (Formal))) | |
7985 | /= N_Access_Definition | |
7986 | then | |
7987 | null; | |
7988 | ||
7989 | -- All other cases are OK since a task entry or routine | |
7990 | -- does not have a restriction on the mode of the first | |
7991 | -- parameter of the overridden interface routine. | |
7992 | ||
7993 | else | |
7994 | Overridden_Subp := Candidate; | |
7995 | return; | |
7996 | end if; | |
7997 | end; | |
8aa15e3b JM |
7998 | |
7999 | -- Functions can override abstract interface functions | |
8000 | ||
8001 | elsif Ekind (Def_Id) = E_Function | |
8002 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
8003 | and then Matches_Prefixed_View_Profile |
8004 | (Parameter_Specifications (Parent (Def_Id)), | |
8005 | Parameter_Specifications (Parent (Subp))) | |
8006 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
8007 | Etype (Result_Definition (Parent (Subp))) | |
8008 | then | |
8009 | Overridden_Subp := Subp; | |
8010 | return; | |
8011 | end if; | |
8012 | ||
8013 | Hom := Homonym (Hom); | |
8014 | end loop; | |
8015 | ||
4adf3c50 AC |
8016 | -- After examining all candidates for overriding, we are left with |
8017 | -- the best match which is a mode incompatible interface routine. | |
8018 | -- Do not emit an error if the Expander is active since this error | |
8019 | -- will be detected later on after all concurrent types are | |
8020 | -- expanded and all wrappers are built. This check is meant for | |
8021 | -- spec-only compilations. | |
8aa15e3b | 8022 | |
4adf3c50 | 8023 | if Present (Candidate) and then not Expander_Active then |
8aa15e3b JM |
8024 | Iface_Typ := |
8025 | Find_Parameter_Type (Parent (First_Formal (Candidate))); | |
8026 | ||
4adf3c50 AC |
8027 | -- Def_Id is primitive of a protected type, declared inside the |
8028 | -- type, and the candidate is primitive of a limited or | |
8029 | -- synchronized interface. | |
8aa15e3b JM |
8030 | |
8031 | if In_Scope | |
8032 | and then Is_Protected_Type (Typ) | |
8033 | and then | |
8034 | (Is_Limited_Interface (Iface_Typ) | |
8035 | or else Is_Protected_Interface (Iface_Typ) | |
8036 | or else Is_Synchronized_Interface (Iface_Typ) | |
8037 | or else Is_Task_Interface (Iface_Typ)) | |
8038 | then | |
8aa15e3b JM |
8039 | Error_Msg_NE |
8040 | ("first formal of & must be of mode `OUT`, `IN OUT`" | |
8041 | & " or access-to-variable", Typ, Candidate); | |
8042 | Error_Msg_N | |
4adf3c50 AC |
8043 | ("\in order to be overridden by protected procedure or " |
8044 | & "entry (RM 9.4(11.9/2))", Typ); | |
8aa15e3b | 8045 | end if; |
5d37ba92 | 8046 | end if; |
8aa15e3b JM |
8047 | |
8048 | Overridden_Subp := Candidate; | |
8049 | return; | |
8050 | end; | |
5d37ba92 ES |
8051 | end Check_Synchronized_Overriding; |
8052 | ||
8053 | ---------------------------- | |
8054 | -- Is_Private_Declaration -- | |
8055 | ---------------------------- | |
8056 | ||
8057 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
8058 | Priv_Decls : List_Id; | |
8059 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
8060 | ||
8061 | begin | |
8062 | if Is_Package_Or_Generic_Package (Current_Scope) | |
8063 | and then In_Private_Part (Current_Scope) | |
8064 | then | |
8065 | Priv_Decls := | |
8066 | Private_Declarations ( | |
8067 | Specification (Unit_Declaration_Node (Current_Scope))); | |
8068 | ||
8069 | return In_Package_Body (Current_Scope) | |
8070 | or else | |
8071 | (Is_List_Member (Decl) | |
8072 | and then List_Containing (Decl) = Priv_Decls) | |
8073 | or else (Nkind (Parent (Decl)) = N_Package_Specification | |
8dbd1460 AC |
8074 | and then not |
8075 | Is_Compilation_Unit | |
8076 | (Defining_Entity (Parent (Decl))) | |
5d37ba92 | 8077 | and then List_Containing (Parent (Parent (Decl))) |
8dbd1460 | 8078 | = Priv_Decls); |
5d37ba92 ES |
8079 | else |
8080 | return False; | |
8081 | end if; | |
8082 | end Is_Private_Declaration; | |
996ae0b0 | 8083 | |
2ddc2000 AC |
8084 | -------------------------- |
8085 | -- Is_Overriding_Alias -- | |
8086 | -------------------------- | |
8087 | ||
8088 | function Is_Overriding_Alias | |
8089 | (Old_E : Entity_Id; | |
8090 | New_E : Entity_Id) return Boolean | |
8091 | is | |
8092 | AO : constant Entity_Id := Alias (Old_E); | |
8093 | AN : constant Entity_Id := Alias (New_E); | |
8094 | ||
8095 | begin | |
8096 | return Scope (AO) /= Scope (AN) | |
8097 | or else No (DTC_Entity (AO)) | |
8098 | or else No (DTC_Entity (AN)) | |
8099 | or else DT_Position (AO) = DT_Position (AN); | |
8100 | end Is_Overriding_Alias; | |
8101 | ||
996ae0b0 RK |
8102 | -- Start of processing for New_Overloaded_Entity |
8103 | ||
8104 | begin | |
fbf5a39b AC |
8105 | -- We need to look for an entity that S may override. This must be a |
8106 | -- homonym in the current scope, so we look for the first homonym of | |
8107 | -- S in the current scope as the starting point for the search. | |
8108 | ||
8109 | E := Current_Entity_In_Scope (S); | |
8110 | ||
947430d5 AC |
8111 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
8112 | -- They are directly added to the list of primitive operations of | |
8113 | -- Derived_Type, unless this is a rederivation in the private part | |
8114 | -- of an operation that was already derived in the visible part of | |
8115 | -- the current package. | |
8116 | ||
0791fbe9 | 8117 | if Ada_Version >= Ada_2005 |
947430d5 AC |
8118 | and then Present (Derived_Type) |
8119 | and then Present (Alias (S)) | |
8120 | and then Is_Dispatching_Operation (Alias (S)) | |
8121 | and then Present (Find_Dispatching_Type (Alias (S))) | |
8122 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
8123 | then | |
8124 | -- For private types, when the full-view is processed we propagate to | |
8125 | -- the full view the non-overridden entities whose attribute "alias" | |
8126 | -- references an interface primitive. These entities were added by | |
8127 | -- Derive_Subprograms to ensure that interface primitives are | |
8128 | -- covered. | |
8129 | ||
8130 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
8131 | -- internal entity that links an interface primitive with its | |
8132 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 8133 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
8134 | |
8135 | if Inside_Freezing_Actions = 0 | |
8136 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
8137 | and then In_Private_Part (Current_Scope) | |
8138 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
8139 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
8140 | and then Full_View (Defining_Identifier (Parent (E))) | |
8141 | = Defining_Identifier (Parent (S)) | |
8142 | and then Alias (E) = Alias (S) | |
8143 | then | |
8144 | Check_Operation_From_Private_View (S, E); | |
8145 | Set_Is_Dispatching_Operation (S); | |
8146 | ||
8147 | -- Common case | |
8148 | ||
8149 | else | |
8150 | Enter_Overloaded_Entity (S); | |
8151 | Check_Dispatching_Operation (S, Empty); | |
8152 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
8153 | end if; | |
8154 | ||
8155 | return; | |
8156 | end if; | |
8157 | ||
fbf5a39b AC |
8158 | -- If there is no homonym then this is definitely not overriding |
8159 | ||
996ae0b0 RK |
8160 | if No (E) then |
8161 | Enter_Overloaded_Entity (S); | |
8162 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 8163 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 8164 | |
ec4867fa ES |
8165 | -- If subprogram has an explicit declaration, check whether it |
8166 | -- has an overriding indicator. | |
758c442c | 8167 | |
ec4867fa | 8168 | if Comes_From_Source (S) then |
8aa15e3b | 8169 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
8170 | |
8171 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
8172 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 8173 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
8174 | -- overriding indicator. |
8175 | ||
8176 | if Ada_Version >= Ada_2012 | |
8177 | and then No (Overridden_Subp) | |
8178 | and then Is_Dispatching_Operation (S) | |
038140ed | 8179 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
8180 | then |
8181 | Overridden_Subp := Overridden_Operation (S); | |
8182 | end if; | |
8183 | ||
5d37ba92 ES |
8184 | Check_Overriding_Indicator |
8185 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
758c442c GD |
8186 | end if; |
8187 | ||
fbf5a39b AC |
8188 | -- If there is a homonym that is not overloadable, then we have an |
8189 | -- error, except for the special cases checked explicitly below. | |
8190 | ||
996ae0b0 RK |
8191 | elsif not Is_Overloadable (E) then |
8192 | ||
8193 | -- Check for spurious conflict produced by a subprogram that has the | |
8194 | -- same name as that of the enclosing generic package. The conflict | |
8195 | -- occurs within an instance, between the subprogram and the renaming | |
8196 | -- declaration for the package. After the subprogram, the package | |
8197 | -- renaming declaration becomes hidden. | |
8198 | ||
8199 | if Ekind (E) = E_Package | |
8200 | and then Present (Renamed_Object (E)) | |
8201 | and then Renamed_Object (E) = Current_Scope | |
8202 | and then Nkind (Parent (Renamed_Object (E))) = | |
8203 | N_Package_Specification | |
8204 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
8205 | then | |
8206 | Set_Is_Hidden (E); | |
8207 | Set_Is_Immediately_Visible (E, False); | |
8208 | Enter_Overloaded_Entity (S); | |
8209 | Set_Homonym (S, Homonym (E)); | |
8210 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 8211 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
8212 | |
8213 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
8214 | -- declaration. However if it is dispatching, it must appear in the |
8215 | -- dispatch table anyway, because it can be dispatched to even if it | |
8216 | -- cannot be called directly. | |
996ae0b0 | 8217 | |
4adf3c50 | 8218 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
8219 | Set_Scope (S, Current_Scope); |
8220 | ||
8221 | if Is_Dispatching_Operation (Alias (S)) then | |
8222 | Check_Dispatching_Operation (S, Empty); | |
8223 | end if; | |
8224 | ||
8225 | return; | |
8226 | ||
8227 | else | |
8228 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 8229 | |
f3d57416 | 8230 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
8231 | |
8232 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
8233 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
8234 | Error_Msg_N ("\& conflicts with declaration#", S); | |
8235 | else | |
8236 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
8237 | end if; |
8238 | ||
8239 | return; | |
8240 | end if; | |
8241 | ||
fbf5a39b AC |
8242 | -- E exists and is overloadable |
8243 | ||
996ae0b0 | 8244 | else |
8aa15e3b | 8245 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 8246 | |
82c80734 RD |
8247 | -- Loop through E and its homonyms to determine if any of them is |
8248 | -- the candidate for overriding by S. | |
996ae0b0 RK |
8249 | |
8250 | while Present (E) loop | |
fbf5a39b AC |
8251 | |
8252 | -- Definitely not interesting if not in the current scope | |
8253 | ||
996ae0b0 RK |
8254 | if Scope (E) /= Current_Scope then |
8255 | null; | |
8256 | ||
fbf5a39b AC |
8257 | -- Check if we have type conformance |
8258 | ||
ec4867fa | 8259 | elsif Type_Conformant (E, S) then |
c8ef728f | 8260 | |
82c80734 RD |
8261 | -- If the old and new entities have the same profile and one |
8262 | -- is not the body of the other, then this is an error, unless | |
8263 | -- one of them is implicitly declared. | |
996ae0b0 RK |
8264 | |
8265 | -- There are some cases when both can be implicit, for example | |
8266 | -- when both a literal and a function that overrides it are | |
f3d57416 | 8267 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 8268 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 8269 | -- a private extension. Ada 83 had a special rule for the |
82c80734 RD |
8270 | -- literal case. In Ada95, the later implicit operation hides |
8271 | -- the former, and the literal is always the former. In the | |
8272 | -- odd case where both are derived operations declared at the | |
8273 | -- same point, both operations should be declared, and in that | |
8274 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
8275 | -- part. This can only occur for certain obscure cases in |
8276 | -- instances, when an operation on a type derived from a formal | |
8277 | -- private type does not override a homograph inherited from | |
8278 | -- the actual. In subsequent derivations of such a type, the | |
8279 | -- DT positions of these operations remain distinct, if they | |
8280 | -- have been set. | |
996ae0b0 RK |
8281 | |
8282 | if Present (Alias (S)) | |
8283 | and then (No (Alias (E)) | |
8284 | or else Comes_From_Source (E) | |
2ddc2000 | 8285 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
8286 | or else |
8287 | (Is_Dispatching_Operation (E) | |
2ddc2000 | 8288 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 8289 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 8290 | then |
82c80734 RD |
8291 | -- When an derived operation is overloaded it may be due to |
8292 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
8293 | -- re-inherits. It has to be dealt with. |
8294 | ||
e660dbf7 | 8295 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
8296 | and then In_Private_Part (Current_Scope) |
8297 | then | |
8298 | Check_Operation_From_Private_View (S, E); | |
8299 | end if; | |
8300 | ||
038140ed AC |
8301 | -- In any case the implicit operation remains hidden by the |
8302 | -- existing declaration, which is overriding. Indicate that | |
8303 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 8304 | |
038140ed AC |
8305 | if Present (Alias (S)) then |
8306 | Set_Overridden_Operation (E, Alias (S)); | |
8307 | else | |
8308 | Set_Overridden_Operation (E, S); | |
8309 | end if; | |
758c442c GD |
8310 | |
8311 | if Comes_From_Source (E) then | |
5d37ba92 | 8312 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
758c442c GD |
8313 | end if; |
8314 | ||
996ae0b0 RK |
8315 | return; |
8316 | ||
26a43556 AC |
8317 | -- Within an instance, the renaming declarations for actual |
8318 | -- subprograms may become ambiguous, but they do not hide each | |
8319 | -- other. | |
996ae0b0 RK |
8320 | |
8321 | elsif Ekind (E) /= E_Entry | |
8322 | and then not Comes_From_Source (E) | |
8323 | and then not Is_Generic_Instance (E) | |
8324 | and then (Present (Alias (E)) | |
8325 | or else Is_Intrinsic_Subprogram (E)) | |
8326 | and then (not In_Instance | |
8327 | or else No (Parent (E)) | |
8328 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 8329 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 8330 | then |
26a43556 AC |
8331 | -- A subprogram child unit is not allowed to override an |
8332 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
8333 | |
8334 | if Is_Child_Unit (S) then | |
8335 | Error_Msg_N | |
8336 | ("child unit overrides inherited subprogram in parent", | |
8337 | S); | |
8338 | return; | |
8339 | end if; | |
8340 | ||
8341 | if Is_Non_Overriding_Operation (E, S) then | |
8342 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 8343 | |
c8ef728f | 8344 | if No (Derived_Type) |
996ae0b0 RK |
8345 | or else Is_Tagged_Type (Derived_Type) |
8346 | then | |
8347 | Check_Dispatching_Operation (S, Empty); | |
8348 | end if; | |
8349 | ||
8350 | return; | |
8351 | end if; | |
8352 | ||
8353 | -- E is a derived operation or an internal operator which | |
8354 | -- is being overridden. Remove E from further visibility. | |
8355 | -- Furthermore, if E is a dispatching operation, it must be | |
8356 | -- replaced in the list of primitive operations of its type | |
8357 | -- (see Override_Dispatching_Operation). | |
8358 | ||
ec4867fa | 8359 | Overridden_Subp := E; |
758c442c | 8360 | |
996ae0b0 RK |
8361 | declare |
8362 | Prev : Entity_Id; | |
8363 | ||
8364 | begin | |
8365 | Prev := First_Entity (Current_Scope); | |
996ae0b0 RK |
8366 | while Present (Prev) |
8367 | and then Next_Entity (Prev) /= E | |
8368 | loop | |
8369 | Next_Entity (Prev); | |
8370 | end loop; | |
8371 | ||
8372 | -- It is possible for E to be in the current scope and | |
8373 | -- yet not in the entity chain. This can only occur in a | |
8374 | -- generic context where E is an implicit concatenation | |
8375 | -- in the formal part, because in a generic body the | |
8376 | -- entity chain starts with the formals. | |
8377 | ||
8378 | pragma Assert | |
8379 | (Present (Prev) or else Chars (E) = Name_Op_Concat); | |
8380 | ||
8381 | -- E must be removed both from the entity_list of the | |
8382 | -- current scope, and from the visibility chain | |
8383 | ||
8384 | if Debug_Flag_E then | |
8385 | Write_Str ("Override implicit operation "); | |
8386 | Write_Int (Int (E)); | |
8387 | Write_Eol; | |
8388 | end if; | |
8389 | ||
8390 | -- If E is a predefined concatenation, it stands for four | |
8391 | -- different operations. As a result, a single explicit | |
8392 | -- declaration does not hide it. In a possible ambiguous | |
8393 | -- situation, Disambiguate chooses the user-defined op, | |
8394 | -- so it is correct to retain the previous internal one. | |
8395 | ||
8396 | if Chars (E) /= Name_Op_Concat | |
8397 | or else Ekind (E) /= E_Operator | |
8398 | then | |
8399 | -- For nondispatching derived operations that are | |
8400 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
8401 | -- part of a package, we retain the derived subprogram |
8402 | -- but mark it as not immediately visible. If the | |
8403 | -- derived operation was declared in the visible part | |
8404 | -- then this ensures that it will still be visible | |
8405 | -- outside the package with the proper signature | |
8406 | -- (calls from outside must also be directed to this | |
8407 | -- version rather than the overriding one, unlike the | |
8408 | -- dispatching case). Calls from inside the package | |
8409 | -- will still resolve to the overriding subprogram | |
8410 | -- since the derived one is marked as not visible | |
8411 | -- within the package. | |
996ae0b0 RK |
8412 | |
8413 | -- If the private operation is dispatching, we achieve | |
8414 | -- the overriding by keeping the implicit operation | |
9865d858 | 8415 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
8416 | -- this fashion the proper body is executed in all |
8417 | -- cases, but the original signature is used outside | |
8418 | -- of the package. | |
8419 | ||
8420 | -- If the overriding is not in the private part, we | |
8421 | -- remove the implicit operation altogether. | |
8422 | ||
8423 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
8424 | if not Is_Dispatching_Operation (E) then |
8425 | Set_Is_Immediately_Visible (E, False); | |
8426 | else | |
e895b435 ES |
8427 | -- Work done in Override_Dispatching_Operation, |
8428 | -- so nothing else need to be done here. | |
996ae0b0 RK |
8429 | |
8430 | null; | |
8431 | end if; | |
996ae0b0 | 8432 | |
fbf5a39b AC |
8433 | else |
8434 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
8435 | |
8436 | if E = Current_Entity (E) then | |
8437 | Prev_Vis := Empty; | |
8438 | else | |
8439 | Prev_Vis := Current_Entity (E); | |
8440 | while Homonym (Prev_Vis) /= E loop | |
8441 | Prev_Vis := Homonym (Prev_Vis); | |
8442 | end loop; | |
8443 | end if; | |
8444 | ||
8445 | if Prev_Vis /= Empty then | |
8446 | ||
8447 | -- Skip E in the visibility chain | |
8448 | ||
8449 | Set_Homonym (Prev_Vis, Homonym (E)); | |
8450 | ||
8451 | else | |
8452 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
8453 | end if; | |
8454 | ||
8455 | Set_Next_Entity (Prev, Next_Entity (E)); | |
8456 | ||
8457 | if No (Next_Entity (Prev)) then | |
8458 | Set_Last_Entity (Current_Scope, Prev); | |
8459 | end if; | |
996ae0b0 RK |
8460 | end if; |
8461 | end if; | |
8462 | ||
8463 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
8464 | |
8465 | -- For entities generated by Derive_Subprograms the | |
8466 | -- overridden operation is the inherited primitive | |
8467 | -- (which is available through the attribute alias). | |
8468 | ||
8469 | if not (Comes_From_Source (E)) | |
8470 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
8471 | and then Find_Dispatching_Type (E) = |
8472 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
8473 | and then Present (Alias (E)) |
8474 | and then Comes_From_Source (Alias (E)) | |
8475 | then | |
8476 | Set_Overridden_Operation (S, Alias (E)); | |
2fe829ae | 8477 | |
6320f5e1 AC |
8478 | -- Normal case of setting entity as overridden |
8479 | ||
8480 | -- Note: Static_Initialization and Overridden_Operation | |
8481 | -- attributes use the same field in subprogram entities. | |
8482 | -- Static_Initialization is only defined for internal | |
8483 | -- initialization procedures, where Overridden_Operation | |
8484 | -- is irrelevant. Therefore the setting of this attribute | |
8485 | -- must check whether the target is an init_proc. | |
8486 | ||
2fe829ae | 8487 | elsif not Is_Init_Proc (S) then |
1c1289e7 AC |
8488 | Set_Overridden_Operation (S, E); |
8489 | end if; | |
8490 | ||
5d37ba92 | 8491 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 8492 | |
fc53fe76 | 8493 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
8494 | -- expanded to override an inherited null procedure, or a |
8495 | -- predefined dispatching primitive then indicate that E | |
038140ed | 8496 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
8497 | |
8498 | if Comes_From_Source (S) | |
8499 | or else | |
8500 | (Present (Parent (S)) | |
8501 | and then | |
8502 | Nkind (Parent (S)) = N_Procedure_Specification | |
8503 | and then | |
8504 | Null_Present (Parent (S))) | |
38ef8ebe AC |
8505 | or else |
8506 | (Present (Alias (E)) | |
f16e8df9 RD |
8507 | and then |
8508 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 8509 | then |
c8ef728f | 8510 | if Present (Alias (E)) then |
41251c60 | 8511 | Set_Overridden_Operation (S, Alias (E)); |
41251c60 JM |
8512 | end if; |
8513 | end if; | |
8514 | ||
996ae0b0 | 8515 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 8516 | |
82c80734 | 8517 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 8518 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
8519 | |
8520 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
8521 | Check_Dispatching_Operation (S, E); |
8522 | ||
996ae0b0 RK |
8523 | else |
8524 | Check_Dispatching_Operation (S, Empty); | |
8525 | end if; | |
8526 | ||
5d37ba92 ES |
8527 | Check_For_Primitive_Subprogram |
8528 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
8529 | goto Check_Inequality; |
8530 | end; | |
8531 | ||
8532 | -- Apparent redeclarations in instances can occur when two | |
8533 | -- formal types get the same actual type. The subprograms in | |
8534 | -- in the instance are legal, even if not callable from the | |
8535 | -- outside. Calls from within are disambiguated elsewhere. | |
8536 | -- For dispatching operations in the visible part, the usual | |
8537 | -- rules apply, and operations with the same profile are not | |
8538 | -- legal (B830001). | |
8539 | ||
8540 | elsif (In_Instance_Visible_Part | |
8541 | and then not Is_Dispatching_Operation (E)) | |
8542 | or else In_Instance_Not_Visible | |
8543 | then | |
8544 | null; | |
8545 | ||
8546 | -- Here we have a real error (identical profile) | |
8547 | ||
8548 | else | |
8549 | Error_Msg_Sloc := Sloc (E); | |
8550 | ||
8551 | -- Avoid cascaded errors if the entity appears in | |
8552 | -- subsequent calls. | |
8553 | ||
8554 | Set_Scope (S, Current_Scope); | |
8555 | ||
5d37ba92 ES |
8556 | -- Generate error, with extra useful warning for the case |
8557 | -- of a generic instance with no completion. | |
996ae0b0 RK |
8558 | |
8559 | if Is_Generic_Instance (S) | |
8560 | and then not Has_Completion (E) | |
8561 | then | |
8562 | Error_Msg_N | |
5d37ba92 ES |
8563 | ("instantiation cannot provide body for&", S); |
8564 | Error_Msg_N ("\& conflicts with declaration#", S); | |
8565 | else | |
8566 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
8567 | end if; |
8568 | ||
8569 | return; | |
8570 | end if; | |
8571 | ||
8572 | else | |
c8ef728f ES |
8573 | -- If one subprogram has an access parameter and the other |
8574 | -- a parameter of an access type, calls to either might be | |
8575 | -- ambiguous. Verify that parameters match except for the | |
8576 | -- access parameter. | |
8577 | ||
8578 | if May_Hide_Profile then | |
8579 | declare | |
ec4867fa ES |
8580 | F1 : Entity_Id; |
8581 | F2 : Entity_Id; | |
8dbd1460 | 8582 | |
c8ef728f ES |
8583 | begin |
8584 | F1 := First_Formal (S); | |
8585 | F2 := First_Formal (E); | |
8586 | while Present (F1) and then Present (F2) loop | |
8587 | if Is_Access_Type (Etype (F1)) then | |
8588 | if not Is_Access_Type (Etype (F2)) | |
8589 | or else not Conforming_Types | |
8590 | (Designated_Type (Etype (F1)), | |
8591 | Designated_Type (Etype (F2)), | |
8592 | Type_Conformant) | |
8593 | then | |
8594 | May_Hide_Profile := False; | |
8595 | end if; | |
8596 | ||
8597 | elsif | |
8598 | not Conforming_Types | |
8599 | (Etype (F1), Etype (F2), Type_Conformant) | |
8600 | then | |
8601 | May_Hide_Profile := False; | |
8602 | end if; | |
8603 | ||
8604 | Next_Formal (F1); | |
8605 | Next_Formal (F2); | |
8606 | end loop; | |
8607 | ||
8608 | if May_Hide_Profile | |
8609 | and then No (F1) | |
8610 | and then No (F2) | |
8611 | then | |
8612 | Error_Msg_NE ("calls to& may be ambiguous?", S, S); | |
8613 | end if; | |
8614 | end; | |
8615 | end if; | |
996ae0b0 RK |
8616 | end if; |
8617 | ||
996ae0b0 RK |
8618 | E := Homonym (E); |
8619 | end loop; | |
8620 | ||
8621 | -- On exit, we know that S is a new entity | |
8622 | ||
8623 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
8624 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
8625 | Check_Overriding_Indicator | |
8626 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 8627 | |
c4d67e2d | 8628 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 8629 | |
c4d67e2d AC |
8630 | if Nkind (S) /= N_Defining_Operator_Symbol then |
8631 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
8632 | Check_SPARK_Restriction | |
8633 | ("overloading not allowed with entity#", S); | |
8634 | end if; | |
8ed68165 | 8635 | |
82c80734 RD |
8636 | -- If S is a derived operation for an untagged type then by |
8637 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
8638 | -- operation was dispatching), so Check_Dispatching_Operation is not |
8639 | -- called in that case. | |
996ae0b0 | 8640 | |
c8ef728f | 8641 | if No (Derived_Type) |
996ae0b0 RK |
8642 | or else Is_Tagged_Type (Derived_Type) |
8643 | then | |
8644 | Check_Dispatching_Operation (S, Empty); | |
8645 | end if; | |
8646 | end if; | |
8647 | ||
82c80734 RD |
8648 | -- If this is a user-defined equality operator that is not a derived |
8649 | -- subprogram, create the corresponding inequality. If the operation is | |
8650 | -- dispatching, the expansion is done elsewhere, and we do not create | |
8651 | -- an explicit inequality operation. | |
996ae0b0 RK |
8652 | |
8653 | <<Check_Inequality>> | |
8654 | if Chars (S) = Name_Op_Eq | |
8655 | and then Etype (S) = Standard_Boolean | |
8656 | and then Present (Parent (S)) | |
8657 | and then not Is_Dispatching_Operation (S) | |
8658 | then | |
8659 | Make_Inequality_Operator (S); | |
d151d6a3 | 8660 | |
dbe945f1 | 8661 | if Ada_Version >= Ada_2012 then |
e5a58fac AC |
8662 | Check_Untagged_Equality (S); |
8663 | end if; | |
996ae0b0 | 8664 | end if; |
996ae0b0 RK |
8665 | end New_Overloaded_Entity; |
8666 | ||
8667 | --------------------- | |
8668 | -- Process_Formals -- | |
8669 | --------------------- | |
8670 | ||
8671 | procedure Process_Formals | |
07fc65c4 | 8672 | (T : List_Id; |
996ae0b0 RK |
8673 | Related_Nod : Node_Id) |
8674 | is | |
8675 | Param_Spec : Node_Id; | |
8676 | Formal : Entity_Id; | |
8677 | Formal_Type : Entity_Id; | |
8678 | Default : Node_Id; | |
8679 | Ptype : Entity_Id; | |
8680 | ||
800621e0 RD |
8681 | Num_Out_Params : Nat := 0; |
8682 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 8683 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 8684 | |
950d217a AC |
8685 | function Designates_From_With_Type (Typ : Entity_Id) return Boolean; |
8686 | -- Determine whether an access type designates a type coming from a | |
8687 | -- limited view. | |
8688 | ||
07fc65c4 | 8689 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
8690 | -- Check whether the default has a class-wide type. After analysis the |
8691 | -- default has the type of the formal, so we must also check explicitly | |
8692 | -- for an access attribute. | |
07fc65c4 | 8693 | |
950d217a AC |
8694 | ------------------------------- |
8695 | -- Designates_From_With_Type -- | |
8696 | ------------------------------- | |
8697 | ||
8698 | function Designates_From_With_Type (Typ : Entity_Id) return Boolean is | |
8699 | Desig : Entity_Id := Typ; | |
8700 | ||
8701 | begin | |
8702 | if Is_Access_Type (Desig) then | |
8703 | Desig := Directly_Designated_Type (Desig); | |
8704 | end if; | |
8705 | ||
8706 | if Is_Class_Wide_Type (Desig) then | |
8707 | Desig := Root_Type (Desig); | |
8708 | end if; | |
8709 | ||
8710 | return | |
8711 | Ekind (Desig) = E_Incomplete_Type | |
8712 | and then From_With_Type (Desig); | |
8713 | end Designates_From_With_Type; | |
8714 | ||
07fc65c4 GB |
8715 | --------------------------- |
8716 | -- Is_Class_Wide_Default -- | |
8717 | --------------------------- | |
8718 | ||
8719 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
8720 | begin | |
8721 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
8722 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
8723 | and then Attribute_Name (D) = Name_Access |
8724 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
8725 | end Is_Class_Wide_Default; |
8726 | ||
8727 | -- Start of processing for Process_Formals | |
8728 | ||
996ae0b0 RK |
8729 | begin |
8730 | -- In order to prevent premature use of the formals in the same formal | |
8731 | -- part, the Ekind is left undefined until all default expressions are | |
8732 | -- analyzed. The Ekind is established in a separate loop at the end. | |
8733 | ||
8734 | Param_Spec := First (T); | |
996ae0b0 | 8735 | while Present (Param_Spec) loop |
996ae0b0 | 8736 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 8737 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
8738 | Enter_Name (Formal); |
8739 | ||
8740 | -- Case of ordinary parameters | |
8741 | ||
8742 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
8743 | Find_Type (Parameter_Type (Param_Spec)); | |
8744 | Ptype := Parameter_Type (Param_Spec); | |
8745 | ||
8746 | if Ptype = Error then | |
8747 | goto Continue; | |
8748 | end if; | |
8749 | ||
8750 | Formal_Type := Entity (Ptype); | |
8751 | ||
ec4867fa ES |
8752 | if Is_Incomplete_Type (Formal_Type) |
8753 | or else | |
8754 | (Is_Class_Wide_Type (Formal_Type) | |
8755 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) | |
996ae0b0 | 8756 | then |
93bcda23 AC |
8757 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
8758 | -- primitive operations, as long as their completion is | |
8759 | -- in the same declarative part. If in the private part | |
8760 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
8761 | -- Check is done on package exit. For access to subprograms, |
8762 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 8763 | |
d8db0bca | 8764 | if Is_Tagged_Type (Formal_Type) then |
93bcda23 | 8765 | if Ekind (Scope (Current_Scope)) = E_Package |
93bcda23 AC |
8766 | and then not From_With_Type (Formal_Type) |
8767 | and then not Is_Class_Wide_Type (Formal_Type) | |
8768 | then | |
cec29135 ES |
8769 | if not Nkind_In |
8770 | (Parent (T), N_Access_Function_Definition, | |
8771 | N_Access_Procedure_Definition) | |
8772 | then | |
8773 | Append_Elmt | |
8774 | (Current_Scope, | |
8775 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
8776 | |
8777 | -- Freezing is delayed to ensure that Register_Prim | |
8778 | -- will get called for this operation, which is needed | |
8779 | -- in cases where static dispatch tables aren't built. | |
8780 | -- (Note that the same is done for controlling access | |
8781 | -- parameter cases in function Access_Definition.) | |
8782 | ||
8783 | Set_Has_Delayed_Freeze (Current_Scope); | |
cec29135 | 8784 | end if; |
93bcda23 | 8785 | end if; |
fbf5a39b | 8786 | |
0a36105d JM |
8787 | -- Special handling of Value_Type for CIL case |
8788 | ||
8789 | elsif Is_Value_Type (Formal_Type) then | |
8790 | null; | |
8791 | ||
800621e0 RD |
8792 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
8793 | N_Access_Procedure_Definition) | |
996ae0b0 | 8794 | then |
0a36105d | 8795 | |
dd386db0 AC |
8796 | -- AI05-0151: Tagged incomplete types are allowed in all |
8797 | -- formal parts. Untagged incomplete types are not allowed | |
8798 | -- in bodies. | |
8799 | ||
8800 | if Ada_Version >= Ada_2012 then | |
8801 | if Is_Tagged_Type (Formal_Type) then | |
8802 | null; | |
8803 | ||
0f1a6a0b AC |
8804 | elsif Nkind_In (Parent (Parent (T)), N_Accept_Statement, |
8805 | N_Entry_Body, | |
8806 | N_Subprogram_Body) | |
dd386db0 AC |
8807 | then |
8808 | Error_Msg_NE | |
8809 | ("invalid use of untagged incomplete type&", | |
0f1a6a0b | 8810 | Ptype, Formal_Type); |
dd386db0 AC |
8811 | end if; |
8812 | ||
8813 | else | |
8814 | Error_Msg_NE | |
8815 | ("invalid use of incomplete type&", | |
0f1a6a0b | 8816 | Param_Spec, Formal_Type); |
dd386db0 AC |
8817 | |
8818 | -- Further checks on the legality of incomplete types | |
8819 | -- in formal parts are delayed until the freeze point | |
8820 | -- of the enclosing subprogram or access to subprogram. | |
8821 | end if; | |
996ae0b0 RK |
8822 | end if; |
8823 | ||
8824 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
8825 | Error_Msg_NE |
8826 | ("premature use of&", | |
8827 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
8828 | end if; |
8829 | ||
0ab80019 | 8830 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 8831 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
8832 | -- formal in the enclosing scope. Finally, replace the parameter |
8833 | -- type of the formal with the internal subtype. | |
7324bf49 | 8834 | |
0791fbe9 | 8835 | if Ada_Version >= Ada_2005 |
41251c60 | 8836 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 8837 | then |
ec4867fa | 8838 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 8839 | Error_Msg_N |
0a36105d JM |
8840 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
8841 | ||
ec4867fa ES |
8842 | else |
8843 | if Can_Never_Be_Null (Formal_Type) | |
8844 | and then Comes_From_Source (Related_Nod) | |
8845 | then | |
ed2233dc | 8846 | Error_Msg_NE |
0a36105d | 8847 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 8848 | Param_Spec, Formal_Type); |
ec4867fa | 8849 | end if; |
41251c60 | 8850 | |
ec4867fa ES |
8851 | Formal_Type := |
8852 | Create_Null_Excluding_Itype | |
8853 | (T => Formal_Type, | |
8854 | Related_Nod => Related_Nod, | |
8855 | Scope_Id => Scope (Current_Scope)); | |
0a36105d JM |
8856 | |
8857 | -- If the designated type of the itype is an itype we | |
8858 | -- decorate it with the Has_Delayed_Freeze attribute to | |
8859 | -- avoid problems with the backend. | |
8860 | ||
8861 | -- Example: | |
8862 | -- type T is access procedure; | |
8863 | -- procedure Op (O : not null T); | |
8864 | ||
8865 | if Is_Itype (Directly_Designated_Type (Formal_Type)) then | |
8866 | Set_Has_Delayed_Freeze (Formal_Type); | |
8867 | end if; | |
ec4867fa | 8868 | end if; |
7324bf49 AC |
8869 | end if; |
8870 | ||
996ae0b0 RK |
8871 | -- An access formal type |
8872 | ||
8873 | else | |
8874 | Formal_Type := | |
8875 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 8876 | |
f937473f RD |
8877 | -- No need to continue if we already notified errors |
8878 | ||
8879 | if not Present (Formal_Type) then | |
8880 | return; | |
8881 | end if; | |
8882 | ||
0ab80019 | 8883 | -- Ada 2005 (AI-254) |
7324bf49 | 8884 | |
af4b9434 AC |
8885 | declare |
8886 | AD : constant Node_Id := | |
8887 | Access_To_Subprogram_Definition | |
8888 | (Parameter_Type (Param_Spec)); | |
8889 | begin | |
8890 | if Present (AD) and then Protected_Present (AD) then | |
8891 | Formal_Type := | |
8892 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 8893 | (Param_Spec); |
af4b9434 AC |
8894 | end if; |
8895 | end; | |
996ae0b0 RK |
8896 | end if; |
8897 | ||
8898 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 8899 | |
fbf5a39b | 8900 | Default := Expression (Param_Spec); |
996ae0b0 RK |
8901 | |
8902 | if Present (Default) then | |
2ba431e5 | 8903 | Check_SPARK_Restriction |
fe5d3068 | 8904 | ("default expression is not allowed", Default); |
38171f43 | 8905 | |
996ae0b0 | 8906 | if Out_Present (Param_Spec) then |
ed2233dc | 8907 | Error_Msg_N |
996ae0b0 RK |
8908 | ("default initialization only allowed for IN parameters", |
8909 | Param_Spec); | |
8910 | end if; | |
8911 | ||
8912 | -- Do the special preanalysis of the expression (see section on | |
8913 | -- "Handling of Default Expressions" in the spec of package Sem). | |
8914 | ||
21d27997 | 8915 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 8916 | |
f29b857f ES |
8917 | -- An access to constant cannot be the default for |
8918 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
8919 | |
8920 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
8921 | and then not Is_Access_Constant (Formal_Type) | |
8922 | and then Is_Access_Type (Etype (Default)) | |
8923 | and then Is_Access_Constant (Etype (Default)) | |
8924 | then | |
f29b857f ES |
8925 | Error_Msg_N |
8926 | ("formal that is access to variable cannot be initialized " & | |
8927 | "with an access-to-constant expression", Default); | |
2eb160f2 ST |
8928 | end if; |
8929 | ||
d8db0bca JM |
8930 | -- Check that the designated type of an access parameter's default |
8931 | -- is not a class-wide type unless the parameter's designated type | |
8932 | -- is also class-wide. | |
996ae0b0 RK |
8933 | |
8934 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
950d217a | 8935 | and then not Designates_From_With_Type (Formal_Type) |
07fc65c4 | 8936 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
8937 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
8938 | then | |
07fc65c4 GB |
8939 | Error_Msg_N |
8940 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 8941 | end if; |
4755cce9 JM |
8942 | |
8943 | -- Check incorrect use of dynamically tagged expressions | |
8944 | ||
8945 | if Is_Tagged_Type (Formal_Type) then | |
8946 | Check_Dynamically_Tagged_Expression | |
8947 | (Expr => Default, | |
8948 | Typ => Formal_Type, | |
8949 | Related_Nod => Default); | |
8950 | end if; | |
996ae0b0 RK |
8951 | end if; |
8952 | ||
41251c60 JM |
8953 | -- Ada 2005 (AI-231): Static checks |
8954 | ||
0791fbe9 | 8955 | if Ada_Version >= Ada_2005 |
41251c60 JM |
8956 | and then Is_Access_Type (Etype (Formal)) |
8957 | and then Can_Never_Be_Null (Etype (Formal)) | |
8958 | then | |
8959 | Null_Exclusion_Static_Checks (Param_Spec); | |
8960 | end if; | |
8961 | ||
996ae0b0 RK |
8962 | <<Continue>> |
8963 | Next (Param_Spec); | |
8964 | end loop; | |
8965 | ||
82c80734 RD |
8966 | -- If this is the formal part of a function specification, analyze the |
8967 | -- subtype mark in the context where the formals are visible but not | |
8968 | -- yet usable, and may hide outer homographs. | |
8969 | ||
8970 | if Nkind (Related_Nod) = N_Function_Specification then | |
8971 | Analyze_Return_Type (Related_Nod); | |
8972 | end if; | |
8973 | ||
996ae0b0 RK |
8974 | -- Now set the kind (mode) of each formal |
8975 | ||
8976 | Param_Spec := First (T); | |
996ae0b0 RK |
8977 | while Present (Param_Spec) loop |
8978 | Formal := Defining_Identifier (Param_Spec); | |
8979 | Set_Formal_Mode (Formal); | |
8980 | ||
8981 | if Ekind (Formal) = E_In_Parameter then | |
8982 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
8983 | ||
8984 | if Present (Expression (Param_Spec)) then | |
8985 | Default := Expression (Param_Spec); | |
8986 | ||
8987 | if Is_Scalar_Type (Etype (Default)) then | |
8988 | if Nkind | |
8989 | (Parameter_Type (Param_Spec)) /= N_Access_Definition | |
8990 | then | |
8991 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
8992 | ||
8993 | else | |
8994 | Formal_Type := Access_Definition | |
8995 | (Related_Nod, Parameter_Type (Param_Spec)); | |
8996 | end if; | |
8997 | ||
8998 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
8999 | end if; | |
2820d220 | 9000 | end if; |
800621e0 RD |
9001 | |
9002 | elsif Ekind (Formal) = E_Out_Parameter then | |
9003 | Num_Out_Params := Num_Out_Params + 1; | |
9004 | ||
9005 | if Num_Out_Params = 1 then | |
9006 | First_Out_Param := Formal; | |
9007 | end if; | |
9008 | ||
9009 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
9010 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
9011 | end if; |
9012 | ||
9013 | Next (Param_Spec); | |
9014 | end loop; | |
800621e0 RD |
9015 | |
9016 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
9017 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
9018 | end if; | |
996ae0b0 RK |
9019 | end Process_Formals; |
9020 | ||
21d27997 RD |
9021 | ------------------ |
9022 | -- Process_PPCs -- | |
9023 | ------------------ | |
9024 | ||
9025 | procedure Process_PPCs | |
9026 | (N : Node_Id; | |
9027 | Spec_Id : Entity_Id; | |
9028 | Body_Id : Entity_Id) | |
9029 | is | |
9030 | Loc : constant Source_Ptr := Sloc (N); | |
9031 | Prag : Node_Id; | |
21d27997 RD |
9032 | Parms : List_Id; |
9033 | ||
e606088a AC |
9034 | Designator : Entity_Id; |
9035 | -- Subprogram designator, set from Spec_Id if present, else Body_Id | |
9036 | ||
beacce02 AC |
9037 | Precond : Node_Id := Empty; |
9038 | -- Set non-Empty if we prepend precondition to the declarations. This | |
9039 | -- is used to hook up inherited preconditions (adding the condition | |
9040 | -- expression with OR ELSE, and adding the message). | |
9041 | ||
9042 | Inherited_Precond : Node_Id; | |
9043 | -- Precondition inherited from parent subprogram | |
9044 | ||
9045 | Inherited : constant Subprogram_List := | |
e606088a AC |
9046 | Inherited_Subprograms (Spec_Id); |
9047 | -- List of subprograms inherited by this subprogram | |
beacce02 AC |
9048 | |
9049 | Plist : List_Id := No_List; | |
9050 | -- List of generated postconditions | |
9051 | ||
f0709ca6 AC |
9052 | function Grab_PPC (Pspec : Entity_Id := Empty) return Node_Id; |
9053 | -- Prag contains an analyzed precondition or postcondition pragma. This | |
9054 | -- function copies the pragma, changes it to the corresponding Check | |
9055 | -- pragma and returns the Check pragma as the result. If Pspec is non- | |
9056 | -- empty, this is the case of inheriting a PPC, where we must change | |
9057 | -- references to parameters of the inherited subprogram to point to the | |
9058 | -- corresponding parameters of the current subprogram. | |
21d27997 | 9059 | |
b4ca2d2c AC |
9060 | function Invariants_Or_Predicates_Present return Boolean; |
9061 | -- Determines if any invariants or predicates are present for any OUT | |
9062 | -- or IN OUT parameters of the subprogram, or (for a function) if the | |
9063 | -- return value has an invariant. | |
e606088a | 9064 | |
21d27997 RD |
9065 | -------------- |
9066 | -- Grab_PPC -- | |
9067 | -------------- | |
9068 | ||
f0709ca6 AC |
9069 | function Grab_PPC (Pspec : Entity_Id := Empty) return Node_Id is |
9070 | Nam : constant Name_Id := Pragma_Name (Prag); | |
9071 | Map : Elist_Id; | |
9072 | CP : Node_Id; | |
21d27997 RD |
9073 | |
9074 | begin | |
f0709ca6 AC |
9075 | -- Prepare map if this is the case where we have to map entities of |
9076 | -- arguments in the overridden subprogram to corresponding entities | |
9077 | -- of the current subprogram. | |
9078 | ||
9079 | if No (Pspec) then | |
9080 | Map := No_Elist; | |
9081 | ||
9082 | else | |
9083 | declare | |
9084 | PF : Entity_Id; | |
9085 | CF : Entity_Id; | |
9086 | ||
9087 | begin | |
9088 | Map := New_Elmt_List; | |
9089 | PF := First_Formal (Pspec); | |
e606088a | 9090 | CF := First_Formal (Designator); |
f0709ca6 AC |
9091 | while Present (PF) loop |
9092 | Append_Elmt (PF, Map); | |
9093 | Append_Elmt (CF, Map); | |
9094 | Next_Formal (PF); | |
9095 | Next_Formal (CF); | |
9096 | end loop; | |
9097 | end; | |
9098 | end if; | |
9099 | ||
308e6f3a | 9100 | -- Now we can copy the tree, doing any required substitutions |
f0709ca6 AC |
9101 | |
9102 | CP := New_Copy_Tree (Prag, Map => Map, New_Scope => Current_Scope); | |
9103 | ||
21d27997 RD |
9104 | -- Set Analyzed to false, since we want to reanalyze the check |
9105 | -- procedure. Note that it is only at the outer level that we | |
9106 | -- do this fiddling, for the spec cases, the already preanalyzed | |
9107 | -- parameters are not affected. | |
766d7add | 9108 | |
1fb00064 AC |
9109 | Set_Analyzed (CP, False); |
9110 | ||
9111 | -- We also make sure Comes_From_Source is False for the copy | |
9112 | ||
9113 | Set_Comes_From_Source (CP, False); | |
9114 | ||
0dabde3a ES |
9115 | -- For a postcondition pragma within a generic, preserve the pragma |
9116 | -- for later expansion. | |
21d27997 | 9117 | |
0dabde3a ES |
9118 | if Nam = Name_Postcondition |
9119 | and then not Expander_Active | |
9120 | then | |
9121 | return CP; | |
9122 | end if; | |
9123 | ||
1fb00064 | 9124 | -- Change copy of pragma into corresponding pragma Check |
21d27997 RD |
9125 | |
9126 | Prepend_To (Pragma_Argument_Associations (CP), | |
9127 | Make_Pragma_Argument_Association (Sloc (Prag), | |
7675ad4f AC |
9128 | Expression => Make_Identifier (Loc, Nam))); |
9129 | Set_Pragma_Identifier (CP, Make_Identifier (Sloc (Prag), Name_Check)); | |
21d27997 | 9130 | |
beacce02 AC |
9131 | -- If this is inherited case and the current message starts with |
9132 | -- "failed p", we change it to "failed inherited p...". | |
f0709ca6 AC |
9133 | |
9134 | if Present (Pspec) then | |
beacce02 AC |
9135 | declare |
9136 | Msg : constant Node_Id := | |
9137 | Last (Pragma_Argument_Associations (CP)); | |
9138 | ||
9139 | begin | |
9140 | if Chars (Msg) = Name_Message then | |
9141 | String_To_Name_Buffer (Strval (Expression (Msg))); | |
9142 | ||
9143 | if Name_Buffer (1 .. 8) = "failed p" then | |
9144 | Insert_Str_In_Name_Buffer ("inherited ", 8); | |
9145 | Set_Strval | |
9146 | (Expression (Last (Pragma_Argument_Associations (CP))), | |
9147 | String_From_Name_Buffer); | |
9148 | end if; | |
9149 | end if; | |
9150 | end; | |
f0709ca6 AC |
9151 | end if; |
9152 | ||
9153 | -- Return the check pragma | |
9154 | ||
21d27997 RD |
9155 | return CP; |
9156 | end Grab_PPC; | |
9157 | ||
b4ca2d2c AC |
9158 | -------------------------------------- |
9159 | -- Invariants_Or_Predicates_Present -- | |
9160 | -------------------------------------- | |
e606088a | 9161 | |
b4ca2d2c AC |
9162 | function Invariants_Or_Predicates_Present return Boolean is |
9163 | Formal : Entity_Id; | |
e606088a AC |
9164 | |
9165 | begin | |
9166 | -- Check function return result | |
9167 | ||
9168 | if Ekind (Designator) /= E_Procedure | |
9169 | and then Has_Invariants (Etype (Designator)) | |
9170 | then | |
9171 | return True; | |
9172 | end if; | |
9173 | ||
9174 | -- Check parameters | |
9175 | ||
9176 | Formal := First_Formal (Designator); | |
9177 | while Present (Formal) loop | |
9178 | if Ekind (Formal) /= E_In_Parameter | |
b4ca2d2c AC |
9179 | and then |
9180 | (Has_Invariants (Etype (Formal)) | |
9181 | or else Present (Predicate_Function (Etype (Formal)))) | |
e606088a AC |
9182 | then |
9183 | return True; | |
9184 | end if; | |
9185 | ||
9186 | Next_Formal (Formal); | |
9187 | end loop; | |
9188 | ||
9189 | return False; | |
b4ca2d2c | 9190 | end Invariants_Or_Predicates_Present; |
e606088a | 9191 | |
21d27997 RD |
9192 | -- Start of processing for Process_PPCs |
9193 | ||
9194 | begin | |
e606088a AC |
9195 | -- Capture designator from spec if present, else from body |
9196 | ||
9197 | if Present (Spec_Id) then | |
9198 | Designator := Spec_Id; | |
9199 | else | |
9200 | Designator := Body_Id; | |
9201 | end if; | |
9202 | ||
21d27997 RD |
9203 | -- Grab preconditions from spec |
9204 | ||
9205 | if Present (Spec_Id) then | |
9206 | ||
9207 | -- Loop through PPC pragmas from spec. Note that preconditions from | |
9208 | -- the body will be analyzed and converted when we scan the body | |
9209 | -- declarations below. | |
9210 | ||
dac3bede | 9211 | Prag := Spec_PPC_List (Contract (Spec_Id)); |
21d27997 | 9212 | while Present (Prag) loop |
1fb00064 AC |
9213 | if Pragma_Name (Prag) = Name_Precondition then |
9214 | ||
beacce02 AC |
9215 | -- For Pre (or Precondition pragma), we simply prepend the |
9216 | -- pragma to the list of declarations right away so that it | |
9217 | -- will be executed at the start of the procedure. Note that | |
9218 | -- this processing reverses the order of the list, which is | |
9219 | -- what we want since new entries were chained to the head of | |
2d395256 AC |
9220 | -- the list. There can be more than one precondition when we |
9221 | -- use pragma Precondition. | |
beacce02 AC |
9222 | |
9223 | if not Class_Present (Prag) then | |
9224 | Prepend (Grab_PPC, Declarations (N)); | |
9225 | ||
9226 | -- For Pre'Class there can only be one pragma, and we save | |
9227 | -- it in Precond for now. We will add inherited Pre'Class | |
9228 | -- stuff before inserting this pragma in the declarations. | |
9229 | else | |
9230 | Precond := Grab_PPC; | |
9231 | end if; | |
21d27997 RD |
9232 | end if; |
9233 | ||
9234 | Prag := Next_Pragma (Prag); | |
9235 | end loop; | |
beacce02 AC |
9236 | |
9237 | -- Now deal with inherited preconditions | |
9238 | ||
9239 | for J in Inherited'Range loop | |
dac3bede | 9240 | Prag := Spec_PPC_List (Contract (Inherited (J))); |
beacce02 AC |
9241 | |
9242 | while Present (Prag) loop | |
9243 | if Pragma_Name (Prag) = Name_Precondition | |
9244 | and then Class_Present (Prag) | |
9245 | then | |
3c971dcc | 9246 | Inherited_Precond := Grab_PPC (Inherited (J)); |
beacce02 AC |
9247 | |
9248 | -- No precondition so far, so establish this as the first | |
9249 | ||
9250 | if No (Precond) then | |
9251 | Precond := Inherited_Precond; | |
9252 | ||
9253 | -- Here we already have a precondition, add inherited one | |
9254 | ||
9255 | else | |
9256 | -- Add new precondition to old one using OR ELSE | |
9257 | ||
9258 | declare | |
9259 | New_Expr : constant Node_Id := | |
9260 | Get_Pragma_Arg | |
9261 | (Next | |
9262 | (First | |
9263 | (Pragma_Argument_Associations | |
9264 | (Inherited_Precond)))); | |
9265 | Old_Expr : constant Node_Id := | |
9266 | Get_Pragma_Arg | |
9267 | (Next | |
9268 | (First | |
9269 | (Pragma_Argument_Associations | |
9270 | (Precond)))); | |
9271 | ||
9272 | begin | |
9273 | if Paren_Count (Old_Expr) = 0 then | |
9274 | Set_Paren_Count (Old_Expr, 1); | |
9275 | end if; | |
9276 | ||
9277 | if Paren_Count (New_Expr) = 0 then | |
9278 | Set_Paren_Count (New_Expr, 1); | |
9279 | end if; | |
9280 | ||
9281 | Rewrite (Old_Expr, | |
9282 | Make_Or_Else (Sloc (Old_Expr), | |
9283 | Left_Opnd => Relocate_Node (Old_Expr), | |
9284 | Right_Opnd => New_Expr)); | |
9285 | end; | |
9286 | ||
9287 | -- Add new message in the form: | |
9288 | ||
9289 | -- failed precondition from bla | |
9290 | -- also failed inherited precondition from bla | |
9291 | -- ... | |
9292 | ||
3c971dcc AC |
9293 | -- Skip this if exception locations are suppressed |
9294 | ||
9295 | if not Exception_Locations_Suppressed then | |
9296 | declare | |
9297 | New_Msg : constant Node_Id := | |
9298 | Get_Pragma_Arg | |
9299 | (Last | |
9300 | (Pragma_Argument_Associations | |
9301 | (Inherited_Precond))); | |
9302 | Old_Msg : constant Node_Id := | |
9303 | Get_Pragma_Arg | |
9304 | (Last | |
9305 | (Pragma_Argument_Associations | |
9306 | (Precond))); | |
9307 | begin | |
9308 | Start_String (Strval (Old_Msg)); | |
9309 | Store_String_Chars (ASCII.LF & " also "); | |
9310 | Store_String_Chars (Strval (New_Msg)); | |
9311 | Set_Strval (Old_Msg, End_String); | |
9312 | end; | |
9313 | end if; | |
beacce02 AC |
9314 | end if; |
9315 | end if; | |
9316 | ||
9317 | Prag := Next_Pragma (Prag); | |
9318 | end loop; | |
9319 | end loop; | |
9320 | ||
9321 | -- If we have built a precondition for Pre'Class (including any | |
9322 | -- Pre'Class aspects inherited from parent subprograms), then we | |
9323 | -- insert this composite precondition at this stage. | |
9324 | ||
9325 | if Present (Precond) then | |
9326 | Prepend (Precond, Declarations (N)); | |
9327 | end if; | |
21d27997 RD |
9328 | end if; |
9329 | ||
9330 | -- Build postconditions procedure if needed and prepend the following | |
9331 | -- declaration to the start of the declarations for the subprogram. | |
9332 | ||
9333 | -- procedure _postconditions [(_Result : resulttype)] is | |
9334 | -- begin | |
9335 | -- pragma Check (Postcondition, condition [,message]); | |
9336 | -- pragma Check (Postcondition, condition [,message]); | |
9337 | -- ... | |
e606088a AC |
9338 | -- Invariant_Procedure (_Result) ... |
9339 | -- Invariant_Procedure (Arg1) | |
9340 | -- ... | |
21d27997 RD |
9341 | -- end; |
9342 | ||
9343 | -- First we deal with the postconditions in the body | |
9344 | ||
9345 | if Is_Non_Empty_List (Declarations (N)) then | |
9346 | ||
9347 | -- Loop through declarations | |
9348 | ||
9349 | Prag := First (Declarations (N)); | |
9350 | while Present (Prag) loop | |
9351 | if Nkind (Prag) = N_Pragma then | |
9352 | ||
9353 | -- If pragma, capture if enabled postcondition, else ignore | |
9354 | ||
9355 | if Pragma_Name (Prag) = Name_Postcondition | |
9356 | and then Check_Enabled (Name_Postcondition) | |
9357 | then | |
9358 | if Plist = No_List then | |
9359 | Plist := Empty_List; | |
9360 | end if; | |
9361 | ||
9362 | Analyze (Prag); | |
0dabde3a | 9363 | |
f0709ca6 AC |
9364 | -- If expansion is disabled, as in a generic unit, save |
9365 | -- pragma for later expansion. | |
0dabde3a ES |
9366 | |
9367 | if not Expander_Active then | |
f0709ca6 | 9368 | Prepend (Grab_PPC, Declarations (N)); |
0dabde3a | 9369 | else |
f0709ca6 | 9370 | Append (Grab_PPC, Plist); |
0dabde3a | 9371 | end if; |
21d27997 RD |
9372 | end if; |
9373 | ||
9374 | Next (Prag); | |
9375 | ||
043ce308 | 9376 | -- Not a pragma, if comes from source, then end scan |
21d27997 RD |
9377 | |
9378 | elsif Comes_From_Source (Prag) then | |
9379 | exit; | |
9380 | ||
043ce308 | 9381 | -- Skip stuff not coming from source |
21d27997 RD |
9382 | |
9383 | else | |
9384 | Next (Prag); | |
9385 | end if; | |
9386 | end loop; | |
9387 | end if; | |
9388 | ||
9389 | -- Now deal with any postconditions from the spec | |
9390 | ||
9391 | if Present (Spec_Id) then | |
e606088a | 9392 | Spec_Postconditions : declare |
f0709ca6 AC |
9393 | procedure Process_Post_Conditions |
9394 | (Spec : Node_Id; | |
9395 | Class : Boolean); | |
9396 | -- This processes the Spec_PPC_List from Spec, processing any | |
9397 | -- postconditions from the list. If Class is True, then only | |
9398 | -- postconditions marked with Class_Present are considered. | |
9399 | -- The caller has checked that Spec_PPC_List is non-Empty. | |
9400 | ||
9401 | ----------------------------- | |
9402 | -- Process_Post_Conditions -- | |
9403 | ----------------------------- | |
9404 | ||
9405 | procedure Process_Post_Conditions | |
9406 | (Spec : Node_Id; | |
9407 | Class : Boolean) | |
9408 | is | |
9409 | Pspec : Node_Id; | |
21d27997 | 9410 | |
f0709ca6 AC |
9411 | begin |
9412 | if Class then | |
9413 | Pspec := Spec; | |
0dabde3a | 9414 | else |
f0709ca6 | 9415 | Pspec := Empty; |
0dabde3a | 9416 | end if; |
f0709ca6 AC |
9417 | |
9418 | -- Loop through PPC pragmas from spec | |
9419 | ||
dac3bede | 9420 | Prag := Spec_PPC_List (Contract (Spec)); |
f0709ca6 AC |
9421 | loop |
9422 | if Pragma_Name (Prag) = Name_Postcondition | |
f0709ca6 AC |
9423 | and then (not Class or else Class_Present (Prag)) |
9424 | then | |
9425 | if Plist = No_List then | |
9426 | Plist := Empty_List; | |
9427 | end if; | |
9428 | ||
9429 | if not Expander_Active then | |
9430 | Prepend | |
9431 | (Grab_PPC (Pspec), Declarations (N)); | |
9432 | else | |
9433 | Append (Grab_PPC (Pspec), Plist); | |
9434 | end if; | |
9435 | end if; | |
9436 | ||
9437 | Prag := Next_Pragma (Prag); | |
9438 | exit when No (Prag); | |
9439 | end loop; | |
9440 | end Process_Post_Conditions; | |
9441 | ||
e606088a AC |
9442 | -- Start of processing for Spec_Postconditions |
9443 | ||
f0709ca6 | 9444 | begin |
dac3bede | 9445 | if Present (Spec_PPC_List (Contract (Spec_Id))) then |
f0709ca6 | 9446 | Process_Post_Conditions (Spec_Id, Class => False); |
21d27997 RD |
9447 | end if; |
9448 | ||
beacce02 | 9449 | -- Process inherited postconditions |
f0709ca6 | 9450 | |
beacce02 | 9451 | for J in Inherited'Range loop |
dac3bede | 9452 | if Present (Spec_PPC_List (Contract (Inherited (J)))) then |
beacce02 | 9453 | Process_Post_Conditions (Inherited (J), Class => True); |
f0709ca6 AC |
9454 | end if; |
9455 | end loop; | |
e606088a | 9456 | end Spec_Postconditions; |
21d27997 RD |
9457 | end if; |
9458 | ||
e606088a AC |
9459 | -- If we had any postconditions and expansion is enabled, or if the |
9460 | -- procedure has invariants, then build the _Postconditions procedure. | |
21d27997 | 9461 | |
b4ca2d2c | 9462 | if (Present (Plist) or else Invariants_Or_Predicates_Present) |
0dabde3a ES |
9463 | and then Expander_Active |
9464 | then | |
e606088a AC |
9465 | if No (Plist) then |
9466 | Plist := Empty_List; | |
9467 | end if; | |
9468 | ||
9469 | -- Special processing for function case | |
9470 | ||
9471 | if Ekind (Designator) /= E_Procedure then | |
9472 | declare | |
9473 | Rent : constant Entity_Id := | |
9474 | Make_Defining_Identifier (Loc, | |
9475 | Chars => Name_uResult); | |
9476 | Ftyp : constant Entity_Id := Etype (Designator); | |
9477 | ||
9478 | begin | |
9479 | Set_Etype (Rent, Ftyp); | |
9480 | ||
9481 | -- Add argument for return | |
9482 | ||
9483 | Parms := | |
9484 | New_List ( | |
9485 | Make_Parameter_Specification (Loc, | |
9486 | Parameter_Type => New_Occurrence_Of (Ftyp, Loc), | |
9487 | Defining_Identifier => Rent)); | |
9488 | ||
9489 | -- Add invariant call if returning type with invariants | |
9490 | ||
fd0ff1cf RD |
9491 | if Has_Invariants (Etype (Rent)) |
9492 | and then Present (Invariant_Procedure (Etype (Rent))) | |
9493 | then | |
e606088a AC |
9494 | Append_To (Plist, |
9495 | Make_Invariant_Call (New_Occurrence_Of (Rent, Loc))); | |
9496 | end if; | |
9497 | end; | |
9498 | ||
9499 | -- Procedure rather than a function | |
21d27997 | 9500 | |
21d27997 RD |
9501 | else |
9502 | Parms := No_List; | |
9503 | end if; | |
9504 | ||
b4ca2d2c AC |
9505 | -- Add invariant calls and predicate calls for parameters. Note that |
9506 | -- this is done for functions as well, since in Ada 2012 they can | |
9507 | -- have IN OUT args. | |
e606088a AC |
9508 | |
9509 | declare | |
9510 | Formal : Entity_Id; | |
b4ca2d2c | 9511 | Ftype : Entity_Id; |
e606088a AC |
9512 | |
9513 | begin | |
9514 | Formal := First_Formal (Designator); | |
9515 | while Present (Formal) loop | |
b4ca2d2c AC |
9516 | if Ekind (Formal) /= E_In_Parameter then |
9517 | Ftype := Etype (Formal); | |
9518 | ||
9519 | if Has_Invariants (Ftype) | |
9520 | and then Present (Invariant_Procedure (Ftype)) | |
9521 | then | |
9522 | Append_To (Plist, | |
9523 | Make_Invariant_Call | |
9524 | (New_Occurrence_Of (Formal, Loc))); | |
9525 | end if; | |
9526 | ||
9527 | if Present (Predicate_Function (Ftype)) then | |
9528 | Append_To (Plist, | |
9529 | Make_Predicate_Check | |
9530 | (Ftype, New_Occurrence_Of (Formal, Loc))); | |
9531 | end if; | |
e606088a AC |
9532 | end if; |
9533 | ||
9534 | Next_Formal (Formal); | |
9535 | end loop; | |
9536 | end; | |
9537 | ||
9538 | -- Build and insert postcondition procedure | |
9539 | ||
043ce308 AC |
9540 | declare |
9541 | Post_Proc : constant Entity_Id := | |
e606088a AC |
9542 | Make_Defining_Identifier (Loc, |
9543 | Chars => Name_uPostconditions); | |
043ce308 | 9544 | -- The entity for the _Postconditions procedure |
f0709ca6 | 9545 | |
043ce308 | 9546 | begin |
043ce308 AC |
9547 | Prepend_To (Declarations (N), |
9548 | Make_Subprogram_Body (Loc, | |
9549 | Specification => | |
9550 | Make_Procedure_Specification (Loc, | |
9551 | Defining_Unit_Name => Post_Proc, | |
9552 | Parameter_Specifications => Parms), | |
9553 | ||
9554 | Declarations => Empty_List, | |
9555 | ||
9556 | Handled_Statement_Sequence => | |
9557 | Make_Handled_Sequence_Of_Statements (Loc, | |
9558 | Statements => Plist))); | |
21d27997 | 9559 | |
5ffe0bab | 9560 | Set_Ekind (Post_Proc, E_Procedure); |
5ffe0bab | 9561 | |
3bb3f6d6 AC |
9562 | -- If this is a procedure, set the Postcondition_Proc attribute on |
9563 | -- the proper defining entity for the subprogram. | |
21d27997 | 9564 | |
e606088a AC |
9565 | if Ekind (Designator) = E_Procedure then |
9566 | Set_Postcondition_Proc (Designator, Post_Proc); | |
043ce308 AC |
9567 | end if; |
9568 | end; | |
21d27997 | 9569 | |
e606088a | 9570 | Set_Has_Postconditions (Designator); |
21d27997 RD |
9571 | end if; |
9572 | end Process_PPCs; | |
9573 | ||
fbf5a39b AC |
9574 | ---------------------------- |
9575 | -- Reference_Body_Formals -- | |
9576 | ---------------------------- | |
9577 | ||
9578 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
9579 | Fs : Entity_Id; | |
9580 | Fb : Entity_Id; | |
9581 | ||
9582 | begin | |
9583 | if Error_Posted (Spec) then | |
9584 | return; | |
9585 | end if; | |
9586 | ||
0a36105d JM |
9587 | -- Iterate over both lists. They may be of different lengths if the two |
9588 | -- specs are not conformant. | |
9589 | ||
fbf5a39b AC |
9590 | Fs := First_Formal (Spec); |
9591 | Fb := First_Formal (Bod); | |
0a36105d | 9592 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
9593 | Generate_Reference (Fs, Fb, 'b'); |
9594 | ||
9595 | if Style_Check then | |
9596 | Style.Check_Identifier (Fb, Fs); | |
9597 | end if; | |
9598 | ||
9599 | Set_Spec_Entity (Fb, Fs); | |
9600 | Set_Referenced (Fs, False); | |
9601 | Next_Formal (Fs); | |
9602 | Next_Formal (Fb); | |
9603 | end loop; | |
9604 | end Reference_Body_Formals; | |
9605 | ||
996ae0b0 RK |
9606 | ------------------------- |
9607 | -- Set_Actual_Subtypes -- | |
9608 | ------------------------- | |
9609 | ||
9610 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
2820d220 AC |
9611 | Decl : Node_Id; |
9612 | Formal : Entity_Id; | |
9613 | T : Entity_Id; | |
9614 | First_Stmt : Node_Id := Empty; | |
9615 | AS_Needed : Boolean; | |
996ae0b0 RK |
9616 | |
9617 | begin | |
f3d57416 | 9618 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
9619 | -- actual subtypes (small optimization). |
9620 | ||
9621 | if Ekind (Subp) = E_Procedure | |
9622 | and then Is_Null_Init_Proc (Subp) | |
9623 | then | |
9624 | return; | |
9625 | end if; | |
9626 | ||
996ae0b0 RK |
9627 | Formal := First_Formal (Subp); |
9628 | while Present (Formal) loop | |
9629 | T := Etype (Formal); | |
9630 | ||
e895b435 | 9631 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
9632 | |
9633 | if Is_Constrained (T) then | |
9634 | AS_Needed := False; | |
9635 | ||
82c80734 RD |
9636 | -- If we have unknown discriminants, then we do not need an actual |
9637 | -- subtype, or more accurately we cannot figure it out! Note that | |
9638 | -- all class-wide types have unknown discriminants. | |
996ae0b0 RK |
9639 | |
9640 | elsif Has_Unknown_Discriminants (T) then | |
9641 | AS_Needed := False; | |
9642 | ||
82c80734 RD |
9643 | -- At this stage we have an unconstrained type that may need an |
9644 | -- actual subtype. For sure the actual subtype is needed if we have | |
9645 | -- an unconstrained array type. | |
996ae0b0 RK |
9646 | |
9647 | elsif Is_Array_Type (T) then | |
9648 | AS_Needed := True; | |
9649 | ||
d8db0bca JM |
9650 | -- The only other case needing an actual subtype is an unconstrained |
9651 | -- record type which is an IN parameter (we cannot generate actual | |
9652 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
9653 | -- change the discriminant values. However we exclude the case of | |
9654 | -- initialization procedures, since discriminants are handled very | |
9655 | -- specially in this context, see the section entitled "Handling of | |
9656 | -- Discriminants" in Einfo. | |
9657 | ||
9658 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
9659 | -- in front end layout mode for size/offset values), since in such | |
9660 | -- functions only discriminants are referenced, and not only are such | |
9661 | -- subtypes not needed, but they cannot always be generated, because | |
9662 | -- of order of elaboration issues. | |
996ae0b0 RK |
9663 | |
9664 | elsif Is_Record_Type (T) | |
9665 | and then Ekind (Formal) = E_In_Parameter | |
9666 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 9667 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
9668 | and then not Is_Discrim_SO_Function (Subp) |
9669 | then | |
9670 | AS_Needed := True; | |
9671 | ||
9672 | -- All other cases do not need an actual subtype | |
9673 | ||
9674 | else | |
9675 | AS_Needed := False; | |
9676 | end if; | |
9677 | ||
9678 | -- Generate actual subtypes for unconstrained arrays and | |
9679 | -- unconstrained discriminated records. | |
9680 | ||
9681 | if AS_Needed then | |
7324bf49 | 9682 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b AC |
9683 | |
9684 | -- If expansion is active, The formal is replaced by a local | |
9685 | -- variable that renames the corresponding entry of the | |
9686 | -- parameter block, and it is this local variable that may | |
9687 | -- require an actual subtype. | |
9688 | ||
9689 | if Expander_Active then | |
9690 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); | |
9691 | else | |
9692 | Decl := Build_Actual_Subtype (T, Formal); | |
9693 | end if; | |
9694 | ||
996ae0b0 RK |
9695 | if Present (Handled_Statement_Sequence (N)) then |
9696 | First_Stmt := | |
9697 | First (Statements (Handled_Statement_Sequence (N))); | |
9698 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
9699 | Mark_Rewrite_Insertion (Decl); | |
9700 | else | |
82c80734 RD |
9701 | -- If the accept statement has no body, there will be no |
9702 | -- reference to the actuals, so no need to compute actual | |
9703 | -- subtypes. | |
996ae0b0 RK |
9704 | |
9705 | return; | |
9706 | end if; | |
9707 | ||
9708 | else | |
fbf5a39b | 9709 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
9710 | Prepend (Decl, Declarations (N)); |
9711 | Mark_Rewrite_Insertion (Decl); | |
9712 | end if; | |
9713 | ||
82c80734 RD |
9714 | -- The declaration uses the bounds of an existing object, and |
9715 | -- therefore needs no constraint checks. | |
2820d220 | 9716 | |
7324bf49 | 9717 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 9718 | |
996ae0b0 RK |
9719 | -- We need to freeze manually the generated type when it is |
9720 | -- inserted anywhere else than in a declarative part. | |
9721 | ||
9722 | if Present (First_Stmt) then | |
9723 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 9724 | Freeze_Entity (Defining_Identifier (Decl), N)); |
996ae0b0 RK |
9725 | end if; |
9726 | ||
fbf5a39b AC |
9727 | if Nkind (N) = N_Accept_Statement |
9728 | and then Expander_Active | |
9729 | then | |
9730 | Set_Actual_Subtype (Renamed_Object (Formal), | |
9731 | Defining_Identifier (Decl)); | |
9732 | else | |
9733 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
9734 | end if; | |
996ae0b0 RK |
9735 | end if; |
9736 | ||
9737 | Next_Formal (Formal); | |
9738 | end loop; | |
9739 | end Set_Actual_Subtypes; | |
9740 | ||
9741 | --------------------- | |
9742 | -- Set_Formal_Mode -- | |
9743 | --------------------- | |
9744 | ||
9745 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
9746 | Spec : constant Node_Id := Parent (Formal_Id); | |
9747 | ||
9748 | begin | |
9749 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
9750 | -- since we ensure that corresponding actuals are always valid at the | |
9751 | -- point of the call. | |
9752 | ||
9753 | if Out_Present (Spec) then | |
996ae0b0 RK |
9754 | if Ekind (Scope (Formal_Id)) = E_Function |
9755 | or else Ekind (Scope (Formal_Id)) = E_Generic_Function | |
9756 | then | |
b4ca2d2c | 9757 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
9758 | |
9759 | if Ada_Version >= Ada_2012 then | |
9760 | if In_Present (Spec) then | |
9761 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
9762 | else | |
9763 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
9764 | end if; | |
9765 | ||
b4ca2d2c AC |
9766 | -- But not in earlier versions of Ada |
9767 | ||
c56a9ba4 AC |
9768 | else |
9769 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
9770 | Set_Ekind (Formal_Id, E_In_Parameter); | |
9771 | end if; | |
996ae0b0 RK |
9772 | |
9773 | elsif In_Present (Spec) then | |
9774 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
9775 | ||
9776 | else | |
fbf5a39b AC |
9777 | Set_Ekind (Formal_Id, E_Out_Parameter); |
9778 | Set_Never_Set_In_Source (Formal_Id, True); | |
9779 | Set_Is_True_Constant (Formal_Id, False); | |
9780 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
9781 | end if; |
9782 | ||
9783 | else | |
9784 | Set_Ekind (Formal_Id, E_In_Parameter); | |
9785 | end if; | |
9786 | ||
fbf5a39b | 9787 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
9788 | -- guarantees that access parameters are always non-null. We also set |
9789 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
9790 | |
9791 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 9792 | |
2813bb6b ES |
9793 | -- Ada 2005 (AI-231): In Ada95, access parameters are always non- |
9794 | -- null; In Ada 2005, only if then null_exclusion is explicit. | |
2820d220 | 9795 | |
0791fbe9 | 9796 | if Ada_Version < Ada_2005 |
2813bb6b | 9797 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
9798 | then |
9799 | Set_Is_Known_Non_Null (Formal_Id); | |
9800 | Set_Can_Never_Be_Null (Formal_Id); | |
9801 | end if; | |
2813bb6b | 9802 | |
41251c60 JM |
9803 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
9804 | ||
2813bb6b ES |
9805 | elsif Is_Access_Type (Etype (Formal_Id)) |
9806 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
9807 | then | |
2813bb6b | 9808 | Set_Is_Known_Non_Null (Formal_Id); |
fbf5a39b AC |
9809 | end if; |
9810 | ||
996ae0b0 RK |
9811 | Set_Mechanism (Formal_Id, Default_Mechanism); |
9812 | Set_Formal_Validity (Formal_Id); | |
9813 | end Set_Formal_Mode; | |
9814 | ||
9815 | ------------------------- | |
9816 | -- Set_Formal_Validity -- | |
9817 | ------------------------- | |
9818 | ||
9819 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
9820 | begin | |
82c80734 RD |
9821 | -- If no validity checking, then we cannot assume anything about the |
9822 | -- validity of parameters, since we do not know there is any checking | |
9823 | -- of the validity on the call side. | |
996ae0b0 RK |
9824 | |
9825 | if not Validity_Checks_On then | |
9826 | return; | |
9827 | ||
fbf5a39b AC |
9828 | -- If validity checking for parameters is enabled, this means we are |
9829 | -- not supposed to make any assumptions about argument values. | |
9830 | ||
9831 | elsif Validity_Check_Parameters then | |
9832 | return; | |
9833 | ||
9834 | -- If we are checking in parameters, we will assume that the caller is | |
9835 | -- also checking parameters, so we can assume the parameter is valid. | |
9836 | ||
996ae0b0 RK |
9837 | elsif Ekind (Formal_Id) = E_In_Parameter |
9838 | and then Validity_Check_In_Params | |
9839 | then | |
9840 | Set_Is_Known_Valid (Formal_Id, True); | |
9841 | ||
fbf5a39b AC |
9842 | -- Similar treatment for IN OUT parameters |
9843 | ||
996ae0b0 RK |
9844 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
9845 | and then Validity_Check_In_Out_Params | |
9846 | then | |
9847 | Set_Is_Known_Valid (Formal_Id, True); | |
9848 | end if; | |
9849 | end Set_Formal_Validity; | |
9850 | ||
9851 | ------------------------ | |
9852 | -- Subtype_Conformant -- | |
9853 | ------------------------ | |
9854 | ||
ce2b6ba5 JM |
9855 | function Subtype_Conformant |
9856 | (New_Id : Entity_Id; | |
9857 | Old_Id : Entity_Id; | |
9858 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
9859 | is | |
996ae0b0 | 9860 | Result : Boolean; |
996ae0b0 | 9861 | begin |
ce2b6ba5 JM |
9862 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
9863 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
9864 | return Result; |
9865 | end Subtype_Conformant; | |
9866 | ||
9867 | --------------------- | |
9868 | -- Type_Conformant -- | |
9869 | --------------------- | |
9870 | ||
41251c60 JM |
9871 | function Type_Conformant |
9872 | (New_Id : Entity_Id; | |
9873 | Old_Id : Entity_Id; | |
9874 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
9875 | is | |
996ae0b0 | 9876 | Result : Boolean; |
996ae0b0 | 9877 | begin |
c8ef728f ES |
9878 | May_Hide_Profile := False; |
9879 | ||
41251c60 JM |
9880 | Check_Conformance |
9881 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
9882 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
9883 | return Result; |
9884 | end Type_Conformant; | |
9885 | ||
9886 | ------------------------------- | |
9887 | -- Valid_Operator_Definition -- | |
9888 | ------------------------------- | |
9889 | ||
9890 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
9891 | N : Integer := 0; | |
9892 | F : Entity_Id; | |
9893 | Id : constant Name_Id := Chars (Designator); | |
9894 | N_OK : Boolean; | |
9895 | ||
9896 | begin | |
9897 | F := First_Formal (Designator); | |
996ae0b0 RK |
9898 | while Present (F) loop |
9899 | N := N + 1; | |
9900 | ||
9901 | if Present (Default_Value (F)) then | |
ed2233dc | 9902 | Error_Msg_N |
996ae0b0 RK |
9903 | ("default values not allowed for operator parameters", |
9904 | Parent (F)); | |
9905 | end if; | |
9906 | ||
9907 | Next_Formal (F); | |
9908 | end loop; | |
9909 | ||
9910 | -- Verify that user-defined operators have proper number of arguments | |
9911 | -- First case of operators which can only be unary | |
9912 | ||
9913 | if Id = Name_Op_Not | |
9914 | or else Id = Name_Op_Abs | |
9915 | then | |
9916 | N_OK := (N = 1); | |
9917 | ||
9918 | -- Case of operators which can be unary or binary | |
9919 | ||
9920 | elsif Id = Name_Op_Add | |
9921 | or Id = Name_Op_Subtract | |
9922 | then | |
9923 | N_OK := (N in 1 .. 2); | |
9924 | ||
9925 | -- All other operators can only be binary | |
9926 | ||
9927 | else | |
9928 | N_OK := (N = 2); | |
9929 | end if; | |
9930 | ||
9931 | if not N_OK then | |
9932 | Error_Msg_N | |
9933 | ("incorrect number of arguments for operator", Designator); | |
9934 | end if; | |
9935 | ||
9936 | if Id = Name_Op_Ne | |
9937 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
9938 | and then not Is_Intrinsic_Subprogram (Designator) | |
9939 | then | |
9940 | Error_Msg_N | |
9941 | ("explicit definition of inequality not allowed", Designator); | |
9942 | end if; | |
9943 | end Valid_Operator_Definition; | |
9944 | ||
9945 | end Sem_Ch6; |