]>
Commit | Line | Data |
---|---|---|
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 | ||
66dc8075 AC |
301 | -- If the expression function comes from source, indicate that so does |
302 | -- its rewriting, so it is compatible with any subsequent expansion of | |
303 | -- the subprogram body (e.g. when it is a protected operation). | |
304 | ||
305 | Set_Comes_From_Source (New_Body, Comes_From_Source (N)); | |
306 | ||
b0186f71 AC |
307 | if Present (Prev) |
308 | and then Ekind (Prev) = E_Generic_Function | |
309 | then | |
310 | -- If the expression completes a generic subprogram, we must create a | |
311 | -- separate node for the body, because at instantiation the original | |
312 | -- node of the generic copy must be a generic subprogram body, and | |
313 | -- cannot be a expression function. Otherwise we just rewrite the | |
314 | -- expression with the non-generic body. | |
315 | ||
316 | Insert_After (N, New_Body); | |
317 | Rewrite (N, Make_Null_Statement (Loc)); | |
318 | Analyze (N); | |
319 | Analyze (New_Body); | |
d2b10647 | 320 | Set_Is_Inlined (Prev); |
b0186f71 | 321 | |
d2b10647 | 322 | elsif Present (Prev) then |
b0186f71 | 323 | Rewrite (N, New_Body); |
d2b10647 ES |
324 | Set_Is_Inlined (Prev); |
325 | Analyze (N); | |
326 | ||
327 | -- If this is not a completion, create both a declaration and a body, | |
328 | -- so that the expression can be inlined whenever possible. | |
329 | ||
330 | else | |
331 | New_Decl := | |
332 | Make_Subprogram_Declaration (Loc, | |
333 | Specification => Specification (N)); | |
334 | Rewrite (N, New_Decl); | |
b0186f71 | 335 | Analyze (N); |
d2b10647 ES |
336 | Set_Is_Inlined (Defining_Entity (New_Decl)); |
337 | ||
338 | -- Create new set of formals for specification in body. | |
339 | ||
340 | Set_Specification (New_Body, | |
341 | Make_Function_Specification (Loc, | |
342 | Defining_Unit_Name => | |
343 | Make_Defining_Identifier (Loc, Chars (Defining_Entity (N))), | |
344 | Parameter_Specifications => | |
345 | Copy_Parameter_List (Defining_Entity (New_Decl)), | |
346 | Result_Definition => | |
347 | New_Copy_Tree (Result_Definition (Specification (New_Decl))))); | |
348 | ||
349 | Insert_After (N, New_Body); | |
350 | Analyze (New_Body); | |
b0186f71 AC |
351 | end if; |
352 | end Analyze_Expression_Function; | |
353 | ||
ec4867fa ES |
354 | ---------------------------------------- |
355 | -- Analyze_Extended_Return_Statement -- | |
356 | ---------------------------------------- | |
357 | ||
358 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
359 | begin | |
5d37ba92 | 360 | Analyze_Return_Statement (N); |
ec4867fa ES |
361 | end Analyze_Extended_Return_Statement; |
362 | ||
996ae0b0 RK |
363 | ---------------------------- |
364 | -- Analyze_Function_Call -- | |
365 | ---------------------------- | |
366 | ||
367 | procedure Analyze_Function_Call (N : Node_Id) is | |
e24329cd YM |
368 | P : constant Node_Id := Name (N); |
369 | Actuals : constant List_Id := Parameter_Associations (N); | |
370 | Actual : Node_Id; | |
996ae0b0 RK |
371 | |
372 | begin | |
373 | Analyze (P); | |
374 | ||
82c80734 | 375 | -- A call of the form A.B (X) may be an Ada05 call, which is rewritten |
e660dbf7 | 376 | -- as B (A, X). If the rewriting is successful, the call has been |
82c80734 RD |
377 | -- analyzed and we just return. |
378 | ||
379 | if Nkind (P) = N_Selected_Component | |
380 | and then Name (N) /= P | |
381 | and then Is_Rewrite_Substitution (N) | |
382 | and then Present (Etype (N)) | |
383 | then | |
384 | return; | |
385 | end if; | |
386 | ||
996ae0b0 RK |
387 | -- If error analyzing name, then set Any_Type as result type and return |
388 | ||
389 | if Etype (P) = Any_Type then | |
390 | Set_Etype (N, Any_Type); | |
391 | return; | |
392 | end if; | |
393 | ||
394 | -- Otherwise analyze the parameters | |
395 | ||
e24329cd YM |
396 | if Present (Actuals) then |
397 | Actual := First (Actuals); | |
996ae0b0 RK |
398 | while Present (Actual) loop |
399 | Analyze (Actual); | |
400 | Check_Parameterless_Call (Actual); | |
401 | Next (Actual); | |
402 | end loop; | |
403 | end if; | |
404 | ||
405 | Analyze_Call (N); | |
996ae0b0 RK |
406 | end Analyze_Function_Call; |
407 | ||
ec4867fa ES |
408 | ----------------------------- |
409 | -- Analyze_Function_Return -- | |
410 | ----------------------------- | |
411 | ||
412 | procedure Analyze_Function_Return (N : Node_Id) is | |
413 | Loc : constant Source_Ptr := Sloc (N); | |
414 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
415 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
416 | ||
5d37ba92 | 417 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
418 | -- Function result subtype |
419 | ||
420 | procedure Check_Limited_Return (Expr : Node_Id); | |
421 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
422 | -- limited types. Used only for simple return statements. | |
423 | -- Expr is the expression returned. | |
424 | ||
425 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
426 | -- Check that the return_subtype_indication properly matches the result | |
427 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
428 | ||
429 | -------------------------- | |
430 | -- Check_Limited_Return -- | |
431 | -------------------------- | |
432 | ||
433 | procedure Check_Limited_Return (Expr : Node_Id) is | |
434 | begin | |
435 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
436 | -- removed and replaced by anonymous access results. This is an | |
437 | -- incompatibility with Ada 95. Not clear whether this should be | |
438 | -- enforced yet or perhaps controllable with special switch. ??? | |
439 | ||
440 | if Is_Limited_Type (R_Type) | |
441 | and then Comes_From_Source (N) | |
442 | and then not In_Instance_Body | |
2a31c32b | 443 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
444 | then |
445 | -- Error in Ada 2005 | |
446 | ||
0791fbe9 | 447 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
448 | and then not Debug_Flag_Dot_L |
449 | and then not GNAT_Mode | |
450 | then | |
451 | Error_Msg_N | |
452 | ("(Ada 2005) cannot copy object of a limited type " & | |
5d37ba92 | 453 | "(RM-2005 6.5(5.5/2))", Expr); |
e0ae93e2 | 454 | |
40f07b4b | 455 | if Is_Immutably_Limited_Type (R_Type) then |
ec4867fa ES |
456 | Error_Msg_N |
457 | ("\return by reference not permitted in Ada 2005", Expr); | |
458 | end if; | |
459 | ||
460 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
461 | -- incompatibility. | |
462 | ||
463 | -- In GNAT mode, this is just a warning, to allow it to be | |
464 | -- evilly turned off. Otherwise it is a real error. | |
465 | ||
9694c039 AC |
466 | -- In a generic context, simplify the warning because it makes |
467 | -- no sense to discuss pass-by-reference or copy. | |
468 | ||
ec4867fa | 469 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
470 | if Inside_A_Generic then |
471 | Error_Msg_N | |
20261dc1 AC |
472 | ("return of limited object not permitted in Ada2005 " |
473 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
9694c039 AC |
474 | |
475 | elsif Is_Immutably_Limited_Type (R_Type) then | |
ec4867fa | 476 | Error_Msg_N |
20261dc1 AC |
477 | ("return by reference not permitted in Ada 2005 " |
478 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
ec4867fa ES |
479 | else |
480 | Error_Msg_N | |
20261dc1 AC |
481 | ("cannot copy object of a limited type in Ada 2005 " |
482 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
ec4867fa ES |
483 | end if; |
484 | ||
485 | -- Ada 95 mode, compatibility warnings disabled | |
486 | ||
487 | else | |
488 | return; -- skip continuation messages below | |
489 | end if; | |
490 | ||
9694c039 AC |
491 | if not Inside_A_Generic then |
492 | Error_Msg_N | |
493 | ("\consider switching to return of access type", Expr); | |
494 | Explain_Limited_Type (R_Type, Expr); | |
495 | end if; | |
ec4867fa ES |
496 | end if; |
497 | end Check_Limited_Return; | |
498 | ||
499 | ------------------------------------- | |
500 | -- Check_Return_Subtype_Indication -- | |
501 | ------------------------------------- | |
502 | ||
503 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
504 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
505 | ||
506 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
507 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
508 | |
509 | Subtype_Ind : constant Node_Id := | |
510 | Object_Definition (Original_Node (Obj_Decl)); | |
511 | ||
512 | R_Type_Is_Anon_Access : | |
513 | constant Boolean := | |
514 | Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type | |
515 | or else | |
516 | Ekind (R_Type) = E_Anonymous_Access_Protected_Subprogram_Type | |
517 | or else | |
518 | Ekind (R_Type) = E_Anonymous_Access_Type; | |
519 | -- True if return type of the function is an anonymous access type | |
520 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
521 | ||
522 | R_Stm_Type_Is_Anon_Access : | |
523 | constant Boolean := | |
0a36105d | 524 | Ekind (R_Stm_Type) = E_Anonymous_Access_Subprogram_Type |
ec4867fa | 525 | or else |
0a36105d | 526 | Ekind (R_Stm_Type) = E_Anonymous_Access_Protected_Subprogram_Type |
ec4867fa | 527 | or else |
0a36105d | 528 | Ekind (R_Stm_Type) = E_Anonymous_Access_Type; |
ec4867fa ES |
529 | -- True if type of the return object is an anonymous access type |
530 | ||
531 | begin | |
7665e4bd | 532 | -- First, avoid cascaded errors |
ec4867fa ES |
533 | |
534 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
535 | return; | |
536 | end if; | |
537 | ||
538 | -- "return access T" case; check that the return statement also has | |
539 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 540 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
541 | |
542 | if R_Type_Is_Anon_Access then | |
543 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
544 | if |
545 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 546 | then |
53cf4600 ES |
547 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
548 | Base_Type (Designated_Type (R_Type)) | |
549 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
550 | then | |
551 | Error_Msg_N | |
552 | ("subtype must statically match function result subtype", | |
553 | Subtype_Mark (Subtype_Ind)); | |
554 | end if; | |
555 | ||
556 | else | |
557 | -- For two anonymous access to subprogram types, the | |
558 | -- types themselves must be type conformant. | |
559 | ||
560 | if not Conforming_Types | |
561 | (R_Stm_Type, R_Type, Fully_Conformant) | |
562 | then | |
563 | Error_Msg_N | |
564 | ("subtype must statically match function result subtype", | |
565 | Subtype_Ind); | |
566 | end if; | |
ec4867fa | 567 | end if; |
0a36105d | 568 | |
ec4867fa ES |
569 | else |
570 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
571 | end if; | |
572 | ||
6cce2156 GD |
573 | -- If the return object is of an anonymous access type, then report |
574 | -- an error if the function's result type is not also anonymous. | |
575 | ||
576 | elsif R_Stm_Type_Is_Anon_Access | |
577 | and then not R_Type_Is_Anon_Access | |
578 | then | |
579 | Error_Msg_N ("anonymous access not allowed for function with " & | |
580 | "named access result", Subtype_Ind); | |
581 | ||
81d93365 AC |
582 | -- Subtype indication case: check that the return object's type is |
583 | -- covered by the result type, and that the subtypes statically match | |
584 | -- when the result subtype is constrained. Also handle record types | |
585 | -- with unknown discriminants for which we have built the underlying | |
586 | -- record view. Coverage is needed to allow specific-type return | |
587 | -- objects when the result type is class-wide (see AI05-32). | |
588 | ||
589 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 590 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
591 | and then |
592 | Covers | |
593 | (Base_Type (R_Type), | |
594 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
595 | then |
596 | -- A null exclusion may be present on the return type, on the | |
597 | -- function specification, on the object declaration or on the | |
598 | -- subtype itself. | |
ec4867fa | 599 | |
21d27997 RD |
600 | if Is_Access_Type (R_Type) |
601 | and then | |
602 | (Can_Never_Be_Null (R_Type) | |
603 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
604 | Can_Never_Be_Null (R_Stm_Type) | |
605 | then | |
606 | Error_Msg_N | |
607 | ("subtype must statically match function result subtype", | |
608 | Subtype_Ind); | |
609 | end if; | |
610 | ||
105b5e65 | 611 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
612 | |
613 | if Is_Constrained (R_Type) | |
614 | or else Is_Access_Type (R_Type) | |
615 | then | |
ec4867fa ES |
616 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
617 | Error_Msg_N | |
0a36105d JM |
618 | ("subtype must statically match function result subtype", |
619 | Subtype_Ind); | |
ec4867fa ES |
620 | end if; |
621 | end if; | |
622 | ||
ff7139c3 AC |
623 | elsif Etype (Base_Type (R_Type)) = R_Stm_Type |
624 | and then Is_Null_Extension (Base_Type (R_Type)) | |
625 | then | |
626 | null; | |
627 | ||
ec4867fa ES |
628 | else |
629 | Error_Msg_N | |
630 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
631 | end if; | |
632 | end Check_Return_Subtype_Indication; | |
633 | ||
634 | --------------------- | |
635 | -- Local Variables -- | |
636 | --------------------- | |
637 | ||
638 | Expr : Node_Id; | |
639 | ||
640 | -- Start of processing for Analyze_Function_Return | |
641 | ||
642 | begin | |
643 | Set_Return_Present (Scope_Id); | |
644 | ||
5d37ba92 | 645 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 646 | Expr := Expression (N); |
4ee646da | 647 | |
e917aec2 RD |
648 | -- Guard against a malformed expression. The parser may have tried to |
649 | -- recover but the node is not analyzable. | |
4ee646da AC |
650 | |
651 | if Nkind (Expr) = N_Error then | |
652 | Set_Etype (Expr, Any_Type); | |
653 | Expander_Mode_Save_And_Set (False); | |
654 | return; | |
655 | ||
656 | else | |
0180fd26 AC |
657 | -- The resolution of a controlled [extension] aggregate associated |
658 | -- with a return statement creates a temporary which needs to be | |
659 | -- finalized on function exit. Wrap the return statement inside a | |
660 | -- block so that the finalization machinery can detect this case. | |
661 | -- This early expansion is done only when the return statement is | |
662 | -- not part of a handled sequence of statements. | |
663 | ||
664 | if Nkind_In (Expr, N_Aggregate, | |
665 | N_Extension_Aggregate) | |
666 | and then Needs_Finalization (R_Type) | |
667 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
668 | then | |
669 | Rewrite (N, | |
670 | Make_Block_Statement (Loc, | |
671 | Handled_Statement_Sequence => | |
672 | Make_Handled_Sequence_Of_Statements (Loc, | |
673 | Statements => New_List (Relocate_Node (N))))); | |
674 | ||
675 | Analyze (N); | |
676 | return; | |
677 | end if; | |
678 | ||
4ee646da AC |
679 | Analyze_And_Resolve (Expr, R_Type); |
680 | Check_Limited_Return (Expr); | |
681 | end if; | |
ec4867fa | 682 | |
ad05f2e9 | 683 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 684 | |
fe5d3068 | 685 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
686 | and then |
687 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 688 | or else Present (Next (N))) |
607d0635 | 689 | then |
2ba431e5 | 690 | Check_SPARK_Restriction |
fe5d3068 | 691 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
692 | end if; |
693 | ||
ec4867fa | 694 | else |
2ba431e5 | 695 | Check_SPARK_Restriction ("extended RETURN is not allowed", N); |
607d0635 | 696 | |
ec4867fa ES |
697 | -- Analyze parts specific to extended_return_statement: |
698 | ||
699 | declare | |
700 | Obj_Decl : constant Node_Id := | |
701 | Last (Return_Object_Declarations (N)); | |
702 | ||
703 | HSS : constant Node_Id := Handled_Statement_Sequence (N); | |
704 | ||
705 | begin | |
706 | Expr := Expression (Obj_Decl); | |
707 | ||
708 | -- Note: The check for OK_For_Limited_Init will happen in | |
709 | -- Analyze_Object_Declaration; we treat it as a normal | |
710 | -- object declaration. | |
711 | ||
cd1c668b | 712 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
713 | Analyze (Obj_Decl); |
714 | ||
ec4867fa ES |
715 | Check_Return_Subtype_Indication (Obj_Decl); |
716 | ||
717 | if Present (HSS) then | |
718 | Analyze (HSS); | |
719 | ||
720 | if Present (Exception_Handlers (HSS)) then | |
721 | ||
722 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
723 | -- Probably by creating an actual N_Block_Statement. | |
724 | -- Probably in Expand. | |
725 | ||
726 | null; | |
727 | end if; | |
728 | end if; | |
729 | ||
9337aa0a AC |
730 | -- Mark the return object as referenced, since the return is an |
731 | -- implicit reference of the object. | |
732 | ||
733 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
734 | ||
ec4867fa ES |
735 | Check_References (Stm_Entity); |
736 | end; | |
737 | end if; | |
738 | ||
21d27997 | 739 | -- Case of Expr present |
5d37ba92 | 740 | |
ec4867fa | 741 | if Present (Expr) |
21d27997 RD |
742 | |
743 | -- Defend against previous errors | |
744 | ||
745 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 746 | and then Present (Etype (Expr)) |
ec4867fa | 747 | then |
5d37ba92 ES |
748 | -- Apply constraint check. Note that this is done before the implicit |
749 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 750 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
751 | -- with null-excluding expressions found in return statements. |
752 | ||
753 | Apply_Constraint_Check (Expr, R_Type); | |
754 | ||
755 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
756 | -- type, apply an implicit conversion of the expression to that type | |
757 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 758 | |
0791fbe9 | 759 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
760 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
761 | then | |
762 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
763 | Analyze_And_Resolve (Expr, R_Type); | |
764 | end if; | |
765 | ||
21d27997 RD |
766 | -- If the result type is class-wide, then check that the return |
767 | -- expression's type is not declared at a deeper level than the | |
768 | -- function (RM05-6.5(5.6/2)). | |
769 | ||
0791fbe9 | 770 | if Ada_Version >= Ada_2005 |
21d27997 RD |
771 | and then Is_Class_Wide_Type (R_Type) |
772 | then | |
773 | if Type_Access_Level (Etype (Expr)) > | |
774 | Subprogram_Access_Level (Scope_Id) | |
775 | then | |
776 | Error_Msg_N | |
777 | ("level of return expression type is deeper than " & | |
778 | "class-wide function!", Expr); | |
779 | end if; | |
780 | end if; | |
781 | ||
4755cce9 JM |
782 | -- Check incorrect use of dynamically tagged expression |
783 | ||
784 | if Is_Tagged_Type (R_Type) then | |
785 | Check_Dynamically_Tagged_Expression | |
786 | (Expr => Expr, | |
787 | Typ => R_Type, | |
788 | Related_Nod => N); | |
ec4867fa ES |
789 | end if; |
790 | ||
ec4867fa ES |
791 | -- ??? A real run-time accessibility check is needed in cases |
792 | -- involving dereferences of access parameters. For now we just | |
793 | -- check the static cases. | |
794 | ||
0791fbe9 | 795 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
40f07b4b | 796 | and then Is_Immutably_Limited_Type (Etype (Scope_Id)) |
ec4867fa ES |
797 | and then Object_Access_Level (Expr) > |
798 | Subprogram_Access_Level (Scope_Id) | |
799 | then | |
ec4867fa | 800 | |
9694c039 AC |
801 | -- Suppress the message in a generic, where the rewriting |
802 | -- is irrelevant. | |
803 | ||
804 | if Inside_A_Generic then | |
805 | null; | |
806 | ||
807 | else | |
808 | Rewrite (N, | |
809 | Make_Raise_Program_Error (Loc, | |
810 | Reason => PE_Accessibility_Check_Failed)); | |
811 | Analyze (N); | |
812 | ||
813 | Error_Msg_N | |
814 | ("cannot return a local value by reference?", N); | |
815 | Error_Msg_NE | |
816 | ("\& will be raised at run time?", | |
817 | N, Standard_Program_Error); | |
818 | end if; | |
ec4867fa | 819 | end if; |
5d37ba92 ES |
820 | |
821 | if Known_Null (Expr) | |
822 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
823 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
824 | then | |
825 | Apply_Compile_Time_Constraint_Error | |
826 | (N => Expr, | |
827 | Msg => "(Ada 2005) null not allowed for " | |
828 | & "null-excluding return?", | |
829 | Reason => CE_Null_Not_Allowed); | |
830 | end if; | |
cd5a9750 AC |
831 | |
832 | -- Apply checks suggested by AI05-0144 (dangerous order dependence) | |
cd5a9750 | 833 | |
1e194575 | 834 | Check_Order_Dependence; |
ec4867fa ES |
835 | end if; |
836 | end Analyze_Function_Return; | |
837 | ||
996ae0b0 RK |
838 | ------------------------------------- |
839 | -- Analyze_Generic_Subprogram_Body -- | |
840 | ------------------------------------- | |
841 | ||
842 | procedure Analyze_Generic_Subprogram_Body | |
843 | (N : Node_Id; | |
844 | Gen_Id : Entity_Id) | |
845 | is | |
fbf5a39b | 846 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 847 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 848 | Body_Id : Entity_Id; |
996ae0b0 | 849 | New_N : Node_Id; |
fbf5a39b | 850 | Spec : Node_Id; |
996ae0b0 RK |
851 | |
852 | begin | |
82c80734 RD |
853 | -- Copy body and disable expansion while analyzing the generic For a |
854 | -- stub, do not copy the stub (which would load the proper body), this | |
855 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
856 | |
857 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
858 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
859 | Rewrite (N, New_N); | |
860 | Start_Generic; | |
861 | end if; | |
862 | ||
863 | Spec := Specification (N); | |
864 | ||
865 | -- Within the body of the generic, the subprogram is callable, and | |
866 | -- behaves like the corresponding non-generic unit. | |
867 | ||
fbf5a39b | 868 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
869 | |
870 | if Kind = E_Generic_Procedure | |
871 | and then Nkind (Spec) /= N_Procedure_Specification | |
872 | then | |
fbf5a39b | 873 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
874 | return; |
875 | ||
876 | elsif Kind = E_Generic_Function | |
877 | and then Nkind (Spec) /= N_Function_Specification | |
878 | then | |
fbf5a39b | 879 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
880 | return; |
881 | end if; | |
882 | ||
fbf5a39b | 883 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
884 | |
885 | if Has_Completion (Gen_Id) | |
886 | and then Nkind (Parent (N)) /= N_Subunit | |
887 | then | |
888 | Error_Msg_N ("duplicate generic body", N); | |
889 | return; | |
890 | else | |
891 | Set_Has_Completion (Gen_Id); | |
892 | end if; | |
893 | ||
894 | if Nkind (N) = N_Subprogram_Body_Stub then | |
895 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
896 | else | |
897 | Set_Corresponding_Spec (N, Gen_Id); | |
898 | end if; | |
899 | ||
900 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
901 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
902 | end if; | |
903 | ||
904 | -- Make generic parameters immediately visible in the body. They are | |
905 | -- needed to process the formals declarations. Then make the formals | |
906 | -- visible in a separate step. | |
907 | ||
0a36105d | 908 | Push_Scope (Gen_Id); |
996ae0b0 RK |
909 | |
910 | declare | |
911 | E : Entity_Id; | |
912 | First_Ent : Entity_Id; | |
913 | ||
914 | begin | |
915 | First_Ent := First_Entity (Gen_Id); | |
916 | ||
917 | E := First_Ent; | |
918 | while Present (E) and then not Is_Formal (E) loop | |
919 | Install_Entity (E); | |
920 | Next_Entity (E); | |
921 | end loop; | |
922 | ||
923 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
924 | ||
925 | -- Now generic formals are visible, and the specification can be | |
926 | -- analyzed, for subsequent conformance check. | |
927 | ||
fbf5a39b | 928 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 929 | |
fbf5a39b | 930 | -- Make formal parameters visible |
996ae0b0 RK |
931 | |
932 | if Present (E) then | |
933 | ||
fbf5a39b AC |
934 | -- E is the first formal parameter, we loop through the formals |
935 | -- installing them so that they will be visible. | |
996ae0b0 RK |
936 | |
937 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
938 | while Present (E) loop |
939 | Install_Entity (E); | |
940 | Next_Formal (E); | |
941 | end loop; | |
942 | end if; | |
943 | ||
e895b435 | 944 | -- Visible generic entity is callable within its own body |
996ae0b0 | 945 | |
ec4867fa ES |
946 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
947 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
948 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
949 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
950 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
fbf5a39b AC |
951 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
952 | ||
953 | if Nkind (N) = N_Subprogram_Body_Stub then | |
954 | ||
e895b435 | 955 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
956 | |
957 | Set_Ekind (Gen_Id, Kind); | |
958 | Set_Ekind (Body_Id, Kind); | |
959 | ||
960 | if Present (First_Ent) then | |
961 | Set_First_Entity (Gen_Id, First_Ent); | |
962 | end if; | |
963 | ||
964 | End_Scope; | |
965 | return; | |
966 | end if; | |
996ae0b0 | 967 | |
82c80734 RD |
968 | -- If this is a compilation unit, it must be made visible explicitly, |
969 | -- because the compilation of the declaration, unlike other library | |
970 | -- unit declarations, does not. If it is not a unit, the following | |
971 | -- is redundant but harmless. | |
996ae0b0 RK |
972 | |
973 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 974 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 975 | |
ec4867fa ES |
976 | if Is_Child_Unit (Gen_Id) then |
977 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
978 | end if; | |
979 | ||
996ae0b0 | 980 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 AC |
981 | |
982 | -- Deal with preconditions and postconditions. In formal verification | |
983 | -- mode, we keep pre- and postconditions attached to entities rather | |
984 | -- than inserted in the code, in order to facilitate a distinct | |
985 | -- treatment for them. | |
986 | ||
56812278 | 987 | if not Alfa_Mode then |
483361a6 AC |
988 | Process_PPCs (N, Gen_Id, Body_Id); |
989 | end if; | |
0dabde3a ES |
990 | |
991 | -- If the generic unit carries pre- or post-conditions, copy them | |
992 | -- to the original generic tree, so that they are properly added | |
993 | -- to any instantiation. | |
994 | ||
995 | declare | |
996 | Orig : constant Node_Id := Original_Node (N); | |
997 | Cond : Node_Id; | |
998 | ||
999 | begin | |
1000 | Cond := First (Declarations (N)); | |
1001 | while Present (Cond) loop | |
1002 | if Nkind (Cond) = N_Pragma | |
1003 | and then Pragma_Name (Cond) = Name_Check | |
1004 | then | |
1005 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1006 | ||
1007 | elsif Nkind (Cond) = N_Pragma | |
1008 | and then Pragma_Name (Cond) = Name_Postcondition | |
1009 | then | |
1010 | Set_Ekind (Defining_Entity (Orig), Ekind (Gen_Id)); | |
1011 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1012 | else | |
1013 | exit; | |
1014 | end if; | |
1015 | ||
1016 | Next (Cond); | |
1017 | end loop; | |
1018 | end; | |
1019 | ||
996ae0b0 RK |
1020 | Analyze_Declarations (Declarations (N)); |
1021 | Check_Completion; | |
1022 | Analyze (Handled_Statement_Sequence (N)); | |
1023 | ||
1024 | Save_Global_References (Original_Node (N)); | |
1025 | ||
82c80734 RD |
1026 | -- Prior to exiting the scope, include generic formals again (if any |
1027 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1028 | |
1029 | if Present (First_Ent) then | |
1030 | Set_First_Entity (Gen_Id, First_Ent); | |
1031 | end if; | |
1032 | ||
fbf5a39b | 1033 | Check_References (Gen_Id); |
996ae0b0 RK |
1034 | end; |
1035 | ||
e6f69614 | 1036 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1037 | End_Scope; |
1038 | Check_Subprogram_Order (N); | |
1039 | ||
e895b435 | 1040 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1041 | |
1042 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1043 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1044 | |
1045 | if Style_Check then | |
1046 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1047 | end if; | |
13d923cc | 1048 | |
996ae0b0 | 1049 | End_Generic; |
996ae0b0 RK |
1050 | end Analyze_Generic_Subprogram_Body; |
1051 | ||
1052 | ----------------------------- | |
1053 | -- Analyze_Operator_Symbol -- | |
1054 | ----------------------------- | |
1055 | ||
82c80734 RD |
1056 | -- An operator symbol such as "+" or "and" may appear in context where the |
1057 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1058 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1059 | -- generates this node, and the semantics does the disambiguation. Other | |
1060 | -- such case are actuals in an instantiation, the generic unit in an | |
1061 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1062 | |
1063 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1064 | Par : constant Node_Id := Parent (N); | |
1065 | ||
1066 | begin | |
800621e0 RD |
1067 | if (Nkind (Par) = N_Function_Call |
1068 | and then N = Name (Par)) | |
996ae0b0 | 1069 | or else Nkind (Par) = N_Function_Instantiation |
800621e0 RD |
1070 | or else (Nkind (Par) = N_Indexed_Component |
1071 | and then N = Prefix (Par)) | |
996ae0b0 RK |
1072 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1073 | and then not Is_Pragma_String_Literal (Par)) | |
1074 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration | |
800621e0 RD |
1075 | or else (Nkind (Par) = N_Attribute_Reference |
1076 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1077 | then |
1078 | Find_Direct_Name (N); | |
1079 | ||
1080 | else | |
1081 | Change_Operator_Symbol_To_String_Literal (N); | |
1082 | Analyze (N); | |
1083 | end if; | |
1084 | end Analyze_Operator_Symbol; | |
1085 | ||
1086 | ----------------------------------- | |
1087 | -- Analyze_Parameter_Association -- | |
1088 | ----------------------------------- | |
1089 | ||
1090 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1091 | begin | |
1092 | Analyze (Explicit_Actual_Parameter (N)); | |
1093 | end Analyze_Parameter_Association; | |
1094 | ||
1095 | ---------------------------- | |
1096 | -- Analyze_Procedure_Call -- | |
1097 | ---------------------------- | |
1098 | ||
1099 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
1100 | Loc : constant Source_Ptr := Sloc (N); | |
1101 | P : constant Node_Id := Name (N); | |
1102 | Actuals : constant List_Id := Parameter_Associations (N); | |
1103 | Actual : Node_Id; | |
1104 | New_N : Node_Id; | |
1105 | ||
1106 | procedure Analyze_Call_And_Resolve; | |
1107 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1108 | -- At end, check illegal order dependence. |
996ae0b0 | 1109 | |
fbf5a39b AC |
1110 | ------------------------------ |
1111 | -- Analyze_Call_And_Resolve -- | |
1112 | ------------------------------ | |
1113 | ||
996ae0b0 RK |
1114 | procedure Analyze_Call_And_Resolve is |
1115 | begin | |
1116 | if Nkind (N) = N_Procedure_Call_Statement then | |
1117 | Analyze_Call (N); | |
1118 | Resolve (N, Standard_Void_Type); | |
cd5a9750 | 1119 | |
1e194575 | 1120 | -- Apply checks suggested by AI05-0144 |
cd5a9750 | 1121 | |
1e194575 | 1122 | Check_Order_Dependence; |
cd5a9750 | 1123 | |
996ae0b0 RK |
1124 | else |
1125 | Analyze (N); | |
1126 | end if; | |
1127 | end Analyze_Call_And_Resolve; | |
1128 | ||
1129 | -- Start of processing for Analyze_Procedure_Call | |
1130 | ||
1131 | begin | |
1132 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1133 | -- a procedure call or an entry call. The prefix may denote an access | |
1134 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1135 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1136 | -- then the construct denotes a call to a member of an entire family. |
1137 | -- If the prefix is a simple name, it may still denote a call to a | |
1138 | -- parameterless member of an entry family. Resolution of these various | |
1139 | -- interpretations is delicate. | |
1140 | ||
1141 | Analyze (P); | |
1142 | ||
758c442c GD |
1143 | -- If this is a call of the form Obj.Op, the call may have been |
1144 | -- analyzed and possibly rewritten into a block, in which case | |
1145 | -- we are done. | |
1146 | ||
1147 | if Analyzed (N) then | |
1148 | return; | |
1149 | end if; | |
1150 | ||
7415029d AC |
1151 | -- If there is an error analyzing the name (which may have been |
1152 | -- rewritten if the original call was in prefix notation) then error | |
1153 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1154 | |
7415029d AC |
1155 | if Error_Posted (N) |
1156 | or else Etype (Name (N)) = Any_Type | |
1157 | then | |
996ae0b0 RK |
1158 | Set_Etype (N, Any_Type); |
1159 | return; | |
1160 | end if; | |
1161 | ||
1162 | -- Otherwise analyze the parameters | |
1163 | ||
1164 | if Present (Actuals) then | |
1165 | Actual := First (Actuals); | |
1166 | ||
1167 | while Present (Actual) loop | |
1168 | Analyze (Actual); | |
1169 | Check_Parameterless_Call (Actual); | |
1170 | Next (Actual); | |
1171 | end loop; | |
1172 | end if; | |
1173 | ||
0bfc9a64 | 1174 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1175 | |
1176 | if Nkind (P) = N_Attribute_Reference | |
1177 | and then (Attribute_Name (P) = Name_Elab_Spec | |
0bfc9a64 AC |
1178 | or else Attribute_Name (P) = Name_Elab_Body |
1179 | or else Attribute_Name (P) = Name_Elab_Subp_Body) | |
996ae0b0 RK |
1180 | then |
1181 | if Present (Actuals) then | |
1182 | Error_Msg_N | |
1183 | ("no parameters allowed for this call", First (Actuals)); | |
1184 | return; | |
1185 | end if; | |
1186 | ||
1187 | Set_Etype (N, Standard_Void_Type); | |
1188 | Set_Analyzed (N); | |
1189 | ||
1190 | elsif Is_Entity_Name (P) | |
1191 | and then Is_Record_Type (Etype (Entity (P))) | |
1192 | and then Remote_AST_I_Dereference (P) | |
1193 | then | |
1194 | return; | |
1195 | ||
1196 | elsif Is_Entity_Name (P) | |
1197 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1198 | then | |
1199 | if Is_Access_Type (Etype (P)) | |
1200 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1201 | and then No (Actuals) | |
1202 | and then Comes_From_Source (N) | |
1203 | then | |
ed2233dc | 1204 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1205 | end if; |
1206 | ||
1207 | Analyze_Call_And_Resolve; | |
1208 | ||
1209 | -- If the prefix is the simple name of an entry family, this is | |
1210 | -- a parameterless call from within the task body itself. | |
1211 | ||
1212 | elsif Is_Entity_Name (P) | |
1213 | and then Nkind (P) = N_Identifier | |
1214 | and then Ekind (Entity (P)) = E_Entry_Family | |
1215 | and then Present (Actuals) | |
1216 | and then No (Next (First (Actuals))) | |
1217 | then | |
82c80734 RD |
1218 | -- Can be call to parameterless entry family. What appears to be the |
1219 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1220 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1221 | -- transformation. |
1222 | ||
1223 | New_N := | |
1224 | Make_Indexed_Component (Loc, | |
1225 | Prefix => | |
1226 | Make_Selected_Component (Loc, | |
1227 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1228 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1229 | Expressions => Actuals); | |
1230 | Set_Name (N, New_N); | |
1231 | Set_Etype (New_N, Standard_Void_Type); | |
1232 | Set_Parameter_Associations (N, No_List); | |
1233 | Analyze_Call_And_Resolve; | |
1234 | ||
1235 | elsif Nkind (P) = N_Explicit_Dereference then | |
1236 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1237 | Analyze_Call_And_Resolve; | |
1238 | else | |
1239 | Error_Msg_N ("expect access to procedure in call", P); | |
1240 | end if; | |
1241 | ||
82c80734 RD |
1242 | -- The name can be a selected component or an indexed component that |
1243 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1244 | -- has parameter associations. | |
996ae0b0 RK |
1245 | |
1246 | elsif Is_Access_Type (Etype (P)) | |
1247 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1248 | then | |
1249 | if Present (Actuals) then | |
1250 | Analyze_Call_And_Resolve; | |
1251 | else | |
ed2233dc | 1252 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1253 | end if; |
1254 | ||
82c80734 RD |
1255 | -- If not an access to subprogram, then the prefix must resolve to the |
1256 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1257 | |
82c80734 RD |
1258 | -- For the case of a simple entry call, P is a selected component where |
1259 | -- the prefix is the task and the selector name is the entry. A call to | |
1260 | -- a protected procedure will have the same syntax. If the protected | |
1261 | -- object contains overloaded operations, the entity may appear as a | |
1262 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1263 | |
1264 | elsif Nkind (P) = N_Selected_Component | |
1265 | and then (Ekind (Entity (Selector_Name (P))) = E_Entry | |
1266 | or else | |
1267 | Ekind (Entity (Selector_Name (P))) = E_Procedure | |
1268 | or else | |
1269 | Ekind (Entity (Selector_Name (P))) = E_Function) | |
1270 | then | |
1271 | Analyze_Call_And_Resolve; | |
1272 | ||
1273 | elsif Nkind (P) = N_Selected_Component | |
1274 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1275 | and then Present (Actuals) | |
1276 | and then No (Next (First (Actuals))) | |
1277 | then | |
82c80734 RD |
1278 | -- Can be call to parameterless entry family. What appears to be the |
1279 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1280 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1281 | -- transformation. |
1282 | ||
1283 | New_N := | |
1284 | Make_Indexed_Component (Loc, | |
1285 | Prefix => New_Copy (P), | |
1286 | Expressions => Actuals); | |
1287 | Set_Name (N, New_N); | |
1288 | Set_Etype (New_N, Standard_Void_Type); | |
1289 | Set_Parameter_Associations (N, No_List); | |
1290 | Analyze_Call_And_Resolve; | |
1291 | ||
1292 | -- For the case of a reference to an element of an entry family, P is | |
1293 | -- an indexed component whose prefix is a selected component (task and | |
1294 | -- entry family), and whose index is the entry family index. | |
1295 | ||
1296 | elsif Nkind (P) = N_Indexed_Component | |
1297 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1298 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1299 | then | |
1300 | Analyze_Call_And_Resolve; | |
1301 | ||
1302 | -- If the prefix is the name of an entry family, it is a call from | |
1303 | -- within the task body itself. | |
1304 | ||
1305 | elsif Nkind (P) = N_Indexed_Component | |
1306 | and then Nkind (Prefix (P)) = N_Identifier | |
1307 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1308 | then | |
1309 | New_N := | |
1310 | Make_Selected_Component (Loc, | |
1311 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1312 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1313 | Rewrite (Prefix (P), New_N); | |
1314 | Analyze (P); | |
1315 | Analyze_Call_And_Resolve; | |
1316 | ||
e895b435 | 1317 | -- Anything else is an error |
996ae0b0 RK |
1318 | |
1319 | else | |
758c442c | 1320 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 RK |
1321 | end if; |
1322 | end Analyze_Procedure_Call; | |
1323 | ||
b0186f71 AC |
1324 | ------------------------------ |
1325 | -- Analyze_Return_Statement -- | |
1326 | ------------------------------ | |
1327 | ||
1328 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1329 | ||
1330 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1331 | N_Extended_Return_Statement)); | |
1332 | ||
1333 | Returns_Object : constant Boolean := | |
1334 | Nkind (N) = N_Extended_Return_Statement | |
1335 | or else | |
1336 | (Nkind (N) = N_Simple_Return_Statement | |
1337 | and then Present (Expression (N))); | |
1338 | -- True if we're returning something; that is, "return <expression>;" | |
1339 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1340 | -- checking: If Returns_Object is True, N should apply to a function | |
1341 | -- body; otherwise N should apply to a procedure body, entry body, | |
1342 | -- accept statement, or extended return statement. | |
1343 | ||
1344 | function Find_What_It_Applies_To return Entity_Id; | |
1345 | -- Find the entity representing the innermost enclosing body, accept | |
1346 | -- statement, or extended return statement. If the result is a callable | |
1347 | -- construct or extended return statement, then this will be the value | |
1348 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1349 | -- illegal. See RM-6.5(4/2). | |
1350 | ||
1351 | ----------------------------- | |
1352 | -- Find_What_It_Applies_To -- | |
1353 | ----------------------------- | |
1354 | ||
1355 | function Find_What_It_Applies_To return Entity_Id is | |
1356 | Result : Entity_Id := Empty; | |
1357 | ||
1358 | begin | |
36b8f95f AC |
1359 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1360 | -- and postconditions. | |
b0186f71 AC |
1361 | |
1362 | for J in reverse 0 .. Scope_Stack.Last loop | |
1363 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1364 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1365 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1366 | end loop; |
1367 | ||
1368 | pragma Assert (Present (Result)); | |
1369 | return Result; | |
1370 | end Find_What_It_Applies_To; | |
1371 | ||
1372 | -- Local declarations | |
1373 | ||
1374 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1375 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1376 | Loc : constant Source_Ptr := Sloc (N); | |
1377 | Stm_Entity : constant Entity_Id := | |
1378 | New_Internal_Entity | |
1379 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1380 | ||
1381 | -- Start of processing for Analyze_Return_Statement | |
1382 | ||
1383 | begin | |
1384 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1385 | ||
1386 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1387 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1388 | ||
1389 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1390 | -- (4/2): an inner return statement will apply to this extended return. | |
1391 | ||
1392 | if Nkind (N) = N_Extended_Return_Statement then | |
1393 | Push_Scope (Stm_Entity); | |
1394 | end if; | |
1395 | ||
1396 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1397 | -- implicitly-generated return that is placed at the end. | |
1398 | ||
1399 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1400 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1401 | end if; | |
1402 | ||
1403 | -- Warn on any unassigned OUT parameters if in procedure | |
1404 | ||
1405 | if Ekind (Scope_Id) = E_Procedure then | |
1406 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1407 | end if; | |
1408 | ||
1409 | -- Check that functions return objects, and other things do not | |
1410 | ||
1411 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1412 | if not Returns_Object then | |
1413 | Error_Msg_N ("missing expression in return from function", N); | |
1414 | end if; | |
1415 | ||
1416 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1417 | if Returns_Object then | |
1418 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1419 | end if; | |
1420 | ||
1421 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1422 | if Returns_Object then | |
1423 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1424 | Error_Msg_N ("entry body cannot return value", N); | |
1425 | else | |
1426 | Error_Msg_N ("accept statement cannot return value", N); | |
1427 | end if; | |
1428 | end if; | |
1429 | ||
1430 | elsif Kind = E_Return_Statement then | |
1431 | ||
1432 | -- We are nested within another return statement, which must be an | |
1433 | -- extended_return_statement. | |
1434 | ||
1435 | if Returns_Object then | |
1436 | Error_Msg_N | |
1437 | ("extended_return_statement cannot return value; " & | |
1438 | "use `""RETURN;""`", N); | |
1439 | end if; | |
1440 | ||
1441 | else | |
1442 | Error_Msg_N ("illegal context for return statement", N); | |
1443 | end if; | |
1444 | ||
1445 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1446 | Analyze_Function_Return (N); | |
1447 | ||
1448 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1449 | Set_Return_Present (Scope_Id); | |
1450 | end if; | |
1451 | ||
1452 | if Nkind (N) = N_Extended_Return_Statement then | |
1453 | End_Scope; | |
1454 | end if; | |
1455 | ||
1456 | Kill_Current_Values (Last_Assignment_Only => True); | |
1457 | Check_Unreachable_Code (N); | |
1458 | end Analyze_Return_Statement; | |
1459 | ||
5d37ba92 ES |
1460 | ------------------------------------- |
1461 | -- Analyze_Simple_Return_Statement -- | |
1462 | ------------------------------------- | |
ec4867fa | 1463 | |
5d37ba92 | 1464 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1465 | begin |
5d37ba92 ES |
1466 | if Present (Expression (N)) then |
1467 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1468 | end if; |
1469 | ||
5d37ba92 ES |
1470 | Analyze_Return_Statement (N); |
1471 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1472 | |
82c80734 RD |
1473 | ------------------------- |
1474 | -- Analyze_Return_Type -- | |
1475 | ------------------------- | |
1476 | ||
1477 | procedure Analyze_Return_Type (N : Node_Id) is | |
1478 | Designator : constant Entity_Id := Defining_Entity (N); | |
1479 | Typ : Entity_Id := Empty; | |
1480 | ||
1481 | begin | |
ec4867fa ES |
1482 | -- Normal case where result definition does not indicate an error |
1483 | ||
41251c60 JM |
1484 | if Result_Definition (N) /= Error then |
1485 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
2ba431e5 | 1486 | Check_SPARK_Restriction |
fe5d3068 | 1487 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1488 | |
b1c11e0e JM |
1489 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1490 | ||
1491 | declare | |
1492 | AD : constant Node_Id := | |
1493 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1494 | begin | |
1495 | if Present (AD) and then Protected_Present (AD) then | |
1496 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1497 | else | |
1498 | Typ := Access_Definition (N, Result_Definition (N)); | |
1499 | end if; | |
1500 | end; | |
1501 | ||
41251c60 JM |
1502 | Set_Parent (Typ, Result_Definition (N)); |
1503 | Set_Is_Local_Anonymous_Access (Typ); | |
1504 | Set_Etype (Designator, Typ); | |
1505 | ||
b66c3ff4 AC |
1506 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1507 | ||
1508 | Null_Exclusion_Static_Checks (N); | |
1509 | ||
41251c60 JM |
1510 | -- Subtype_Mark case |
1511 | ||
1512 | else | |
1513 | Find_Type (Result_Definition (N)); | |
1514 | Typ := Entity (Result_Definition (N)); | |
1515 | Set_Etype (Designator, Typ); | |
1516 | ||
2ba431e5 | 1517 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1518 | |
fe5d3068 | 1519 | if Is_Array_Type (Typ) |
daec8eeb YM |
1520 | and then not Is_Constrained (Typ) |
1521 | then | |
2ba431e5 | 1522 | Check_SPARK_Restriction |
fe5d3068 | 1523 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1524 | Result_Definition (N)); |
daec8eeb YM |
1525 | end if; |
1526 | ||
b66c3ff4 AC |
1527 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1528 | ||
1529 | Null_Exclusion_Static_Checks (N); | |
1530 | ||
1531 | -- If a null exclusion is imposed on the result type, then create | |
1532 | -- a null-excluding itype (an access subtype) and use it as the | |
1533 | -- function's Etype. Note that the null exclusion checks are done | |
1534 | -- right before this, because they don't get applied to types that | |
1535 | -- do not come from source. | |
1536 | ||
1537 | if Is_Access_Type (Typ) | |
1538 | and then Null_Exclusion_Present (N) | |
1539 | then | |
1540 | Set_Etype (Designator, | |
1541 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
1542 | (T => Typ, |
1543 | Related_Nod => N, | |
1544 | Scope_Id => Scope (Current_Scope))); | |
1545 | ||
1546 | -- The new subtype must be elaborated before use because | |
1547 | -- it is visible outside of the function. However its base | |
1548 | -- type may not be frozen yet, so the reference that will | |
1549 | -- force elaboration must be attached to the freezing of | |
1550 | -- the base type. | |
1551 | ||
212863c0 AC |
1552 | -- If the return specification appears on a proper body, |
1553 | -- the subtype will have been created already on the spec. | |
1554 | ||
ff7139c3 | 1555 | if Is_Frozen (Typ) then |
212863c0 AC |
1556 | if Nkind (Parent (N)) = N_Subprogram_Body |
1557 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
1558 | then | |
1559 | null; | |
1560 | else | |
1561 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
1562 | end if; | |
1563 | ||
ff7139c3 AC |
1564 | else |
1565 | Ensure_Freeze_Node (Typ); | |
1566 | ||
1567 | declare | |
212863c0 | 1568 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
1569 | begin |
1570 | Set_Itype (IR, Etype (Designator)); | |
1571 | Append_Freeze_Actions (Typ, New_List (IR)); | |
1572 | end; | |
1573 | end if; | |
1574 | ||
b66c3ff4 AC |
1575 | else |
1576 | Set_Etype (Designator, Typ); | |
1577 | end if; | |
1578 | ||
41251c60 | 1579 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
1580 | and then Is_Value_Type (Typ) |
1581 | then | |
1582 | null; | |
1583 | ||
1584 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 JM |
1585 | or else (Is_Class_Wide_Type (Typ) |
1586 | and then | |
1587 | Ekind (Root_Type (Typ)) = E_Incomplete_Type) | |
1588 | then | |
dd386db0 AC |
1589 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
1590 | -- parts. Untagged incomplete types are not allowed in bodies. | |
1591 | ||
1592 | if Ada_Version >= Ada_2012 then | |
1593 | if Is_Tagged_Type (Typ) then | |
1594 | null; | |
1595 | ||
1596 | elsif Nkind_In (Parent (Parent (N)), | |
1597 | N_Accept_Statement, | |
1598 | N_Entry_Body, | |
1599 | N_Subprogram_Body) | |
1600 | then | |
1601 | Error_Msg_NE | |
1602 | ("invalid use of untagged incomplete type&", | |
1603 | Designator, Typ); | |
1604 | end if; | |
1605 | ||
63be2a5a AC |
1606 | -- The type must be completed in the current package. This |
1607 | -- is checked at the end of the package declaraton, when | |
1608 | -- Taft amemdment types are identified. | |
1609 | ||
1610 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 1611 | and then In_Private_Part (Scope (Current_Scope)) |
63be2a5a AC |
1612 | then |
1613 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
1614 | end if; | |
1615 | ||
dd386db0 AC |
1616 | else |
1617 | Error_Msg_NE | |
1618 | ("invalid use of incomplete type&", Designator, Typ); | |
1619 | end if; | |
41251c60 | 1620 | end if; |
82c80734 RD |
1621 | end if; |
1622 | ||
ec4867fa ES |
1623 | -- Case where result definition does indicate an error |
1624 | ||
82c80734 RD |
1625 | else |
1626 | Set_Etype (Designator, Any_Type); | |
1627 | end if; | |
1628 | end Analyze_Return_Type; | |
1629 | ||
996ae0b0 RK |
1630 | ----------------------------- |
1631 | -- Analyze_Subprogram_Body -- | |
1632 | ----------------------------- | |
1633 | ||
b1b543d2 BD |
1634 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
1635 | Loc : constant Source_Ptr := Sloc (N); | |
1636 | Body_Spec : constant Node_Id := Specification (N); | |
1637 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
1638 | ||
1639 | begin | |
1640 | if Debug_Flag_C then | |
1641 | Write_Str ("==> subprogram body "); | |
1642 | Write_Name (Chars (Body_Id)); | |
1643 | Write_Str (" from "); | |
1644 | Write_Location (Loc); | |
1645 | Write_Eol; | |
1646 | Indent; | |
1647 | end if; | |
1648 | ||
1649 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
1650 | ||
1651 | -- The real work is split out into the helper, so it can do "return;" | |
1652 | -- without skipping the debug output: | |
1653 | ||
1654 | Analyze_Subprogram_Body_Helper (N); | |
1655 | ||
1656 | if Debug_Flag_C then | |
1657 | Outdent; | |
1658 | Write_Str ("<== subprogram body "); | |
1659 | Write_Name (Chars (Body_Id)); | |
1660 | Write_Str (" from "); | |
1661 | Write_Location (Loc); | |
1662 | Write_Eol; | |
1663 | end if; | |
1664 | end Analyze_Subprogram_Body; | |
1665 | ||
1666 | ------------------------------------ | |
1667 | -- Analyze_Subprogram_Body_Helper -- | |
1668 | ------------------------------------ | |
1669 | ||
996ae0b0 RK |
1670 | -- This procedure is called for regular subprogram bodies, generic bodies, |
1671 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
1672 | -- specification matters, and is used to create a proper declaration for | |
1673 | -- the subprogram, or to perform conformance checks. | |
1674 | ||
b1b543d2 | 1675 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b | 1676 | Loc : constant Source_Ptr := Sloc (N); |
33931112 | 1677 | Body_Deleted : constant Boolean := False; |
fbf5a39b AC |
1678 | Body_Spec : constant Node_Id := Specification (N); |
1679 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
1680 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 1681 | Conformant : Boolean; |
21d27997 | 1682 | HSS : Node_Id; |
07fc65c4 | 1683 | P_Ent : Entity_Id; |
21d27997 RD |
1684 | Prot_Typ : Entity_Id := Empty; |
1685 | Spec_Id : Entity_Id; | |
1686 | Spec_Decl : Node_Id := Empty; | |
1687 | ||
1688 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
1689 | -- When we analyze a separate spec, the entity chain ends up containing | |
1690 | -- the formals, as well as any itypes generated during analysis of the | |
1691 | -- default expressions for parameters, or the arguments of associated | |
1692 | -- precondition/postcondition pragmas (which are analyzed in the context | |
1693 | -- of the spec since they have visibility on formals). | |
1694 | -- | |
1695 | -- These entities belong with the spec and not the body. However we do | |
1696 | -- the analysis of the body in the context of the spec (again to obtain | |
1697 | -- visibility to the formals), and all the entities generated during | |
1698 | -- this analysis end up also chained to the entity chain of the spec. | |
1699 | -- But they really belong to the body, and there is circuitry to move | |
1700 | -- them from the spec to the body. | |
1701 | -- | |
1702 | -- However, when we do this move, we don't want to move the real spec | |
1703 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
1704 | -- variable points to the last real spec entity, so we only move those | |
1705 | -- chained beyond that point. It is initialized to Empty to deal with | |
1706 | -- the case where there is no separate spec. | |
996ae0b0 | 1707 | |
ec4867fa | 1708 | procedure Check_Anonymous_Return; |
e50e1c5e | 1709 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
1710 | -- or a type that contains tasks, we must create a master entity for |
1711 | -- the anonymous type, which typically will be used in an allocator | |
1712 | -- in the body of the function. | |
1713 | ||
e660dbf7 JM |
1714 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
1715 | -- Look ahead to recognize a pragma that may appear after the body. | |
1716 | -- If there is a previous spec, check that it appears in the same | |
1717 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
1718 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
1719 | -- If the body acts as a spec, and inlining is required, we create a | |
1720 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
1721 | -- If pragma does not appear after the body, check whether there is |
1722 | -- an inline pragma before any local declarations. | |
c37bb106 | 1723 | |
7665e4bd AC |
1724 | procedure Check_Missing_Return; |
1725 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
1726 | -- the warning checks implemented by Check_Returns. In formal mode, also |
1727 | -- verify that a function ends with a RETURN and that a procedure does | |
1728 | -- not contain any RETURN. | |
7665e4bd | 1729 | |
d44202ba HK |
1730 | function Disambiguate_Spec return Entity_Id; |
1731 | -- When a primitive is declared between the private view and the full | |
1732 | -- view of a concurrent type which implements an interface, a special | |
1733 | -- mechanism is used to find the corresponding spec of the primitive | |
1734 | -- body. | |
1735 | ||
1736 | function Is_Private_Concurrent_Primitive | |
1737 | (Subp_Id : Entity_Id) return Boolean; | |
1738 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
1739 | -- type that implements an interface and has a private view. | |
1740 | ||
76a69663 ES |
1741 | procedure Set_Trivial_Subprogram (N : Node_Id); |
1742 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
1743 | -- subprogram whose body is being analyzed. N is the statement node | |
1744 | -- causing the flag to be set, if the following statement is a return | |
1745 | -- of an entity, we mark the entity as set in source to suppress any | |
1746 | -- warning on the stylized use of function stubs with a dummy return. | |
1747 | ||
758c442c GD |
1748 | procedure Verify_Overriding_Indicator; |
1749 | -- If there was a previous spec, the entity has been entered in the | |
1750 | -- current scope previously. If the body itself carries an overriding | |
1751 | -- indicator, check that it is consistent with the known status of the | |
1752 | -- entity. | |
1753 | ||
ec4867fa ES |
1754 | ---------------------------- |
1755 | -- Check_Anonymous_Return -- | |
1756 | ---------------------------- | |
1757 | ||
1758 | procedure Check_Anonymous_Return is | |
1759 | Decl : Node_Id; | |
a523b302 | 1760 | Par : Node_Id; |
ec4867fa ES |
1761 | Scop : Entity_Id; |
1762 | ||
1763 | begin | |
1764 | if Present (Spec_Id) then | |
1765 | Scop := Spec_Id; | |
1766 | else | |
1767 | Scop := Body_Id; | |
1768 | end if; | |
1769 | ||
1770 | if Ekind (Scop) = E_Function | |
1771 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 JM |
1772 | and then not Is_Thunk (Scop) |
1773 | and then (Has_Task (Designated_Type (Etype (Scop))) | |
1774 | or else | |
1775 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) | |
1776 | and then | |
1777 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 1778 | and then Expander_Active |
b20de9b9 AC |
1779 | |
1780 | -- Avoid cases with no tasking support | |
1781 | ||
1782 | and then RTE_Available (RE_Current_Master) | |
1783 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
1784 | then |
1785 | Decl := | |
1786 | Make_Object_Declaration (Loc, | |
1787 | Defining_Identifier => | |
1788 | Make_Defining_Identifier (Loc, Name_uMaster), | |
1789 | Constant_Present => True, | |
1790 | Object_Definition => | |
1791 | New_Reference_To (RTE (RE_Master_Id), Loc), | |
1792 | Expression => | |
1793 | Make_Explicit_Dereference (Loc, | |
1794 | New_Reference_To (RTE (RE_Current_Master), Loc))); | |
1795 | ||
1796 | if Present (Declarations (N)) then | |
1797 | Prepend (Decl, Declarations (N)); | |
1798 | else | |
1799 | Set_Declarations (N, New_List (Decl)); | |
1800 | end if; | |
1801 | ||
1802 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
1803 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
1804 | |
1805 | -- Now mark the containing scope as a task master | |
1806 | ||
1807 | Par := N; | |
1808 | while Nkind (Par) /= N_Compilation_Unit loop | |
1809 | Par := Parent (Par); | |
1810 | pragma Assert (Present (Par)); | |
1811 | ||
1812 | -- If we fall off the top, we are at the outer level, and | |
1813 | -- the environment task is our effective master, so nothing | |
1814 | -- to mark. | |
1815 | ||
1816 | if Nkind_In | |
1817 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
1818 | then | |
1819 | Set_Is_Task_Master (Par, True); | |
1820 | exit; | |
1821 | end if; | |
1822 | end loop; | |
ec4867fa ES |
1823 | end if; |
1824 | end Check_Anonymous_Return; | |
1825 | ||
e660dbf7 JM |
1826 | ------------------------- |
1827 | -- Check_Inline_Pragma -- | |
1828 | ------------------------- | |
758c442c | 1829 | |
e660dbf7 JM |
1830 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
1831 | Prag : Node_Id; | |
1832 | Plist : List_Id; | |
0fb2ea01 | 1833 | |
21d27997 | 1834 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 1835 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 1836 | -- to this subprogram. |
21d27997 RD |
1837 | |
1838 | ----------------------- | |
1839 | -- Is_Inline_Pragma -- | |
1840 | ----------------------- | |
1841 | ||
1842 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
1843 | begin | |
1844 | return | |
1845 | Nkind (N) = N_Pragma | |
1846 | and then | |
1847 | (Pragma_Name (N) = Name_Inline_Always | |
1848 | or else | |
1849 | (Front_End_Inlining | |
1850 | and then Pragma_Name (N) = Name_Inline)) | |
1851 | and then | |
1852 | Chars | |
1853 | (Expression (First (Pragma_Argument_Associations (N)))) | |
1854 | = Chars (Body_Id); | |
1855 | end Is_Inline_Pragma; | |
1856 | ||
1857 | -- Start of processing for Check_Inline_Pragma | |
1858 | ||
c37bb106 | 1859 | begin |
e660dbf7 JM |
1860 | if not Expander_Active then |
1861 | return; | |
1862 | end if; | |
1863 | ||
1864 | if Is_List_Member (N) | |
1865 | and then Present (Next (N)) | |
21d27997 | 1866 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
1867 | then |
1868 | Prag := Next (N); | |
1869 | ||
21d27997 RD |
1870 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
1871 | and then Present (Declarations (N)) | |
1872 | and then Is_Inline_Pragma (First (Declarations (N))) | |
1873 | then | |
1874 | Prag := First (Declarations (N)); | |
1875 | ||
e660dbf7 JM |
1876 | else |
1877 | Prag := Empty; | |
c37bb106 | 1878 | end if; |
e660dbf7 JM |
1879 | |
1880 | if Present (Prag) then | |
1881 | if Present (Spec_Id) then | |
30196a76 | 1882 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
1883 | Analyze (Prag); |
1884 | end if; | |
1885 | ||
1886 | else | |
d39d6bb8 | 1887 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
1888 | |
1889 | declare | |
1890 | Subp : constant Entity_Id := | |
30196a76 | 1891 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 1892 | Decl : constant Node_Id := |
30196a76 RD |
1893 | Make_Subprogram_Declaration (Loc, |
1894 | Specification => | |
1895 | New_Copy_Tree (Specification (N))); | |
1896 | ||
e660dbf7 JM |
1897 | begin |
1898 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
1899 | ||
1900 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 1901 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
1902 | Set_Parameter_Specifications |
1903 | (Specification (Decl), Plist); | |
1904 | end if; | |
1905 | ||
1906 | Insert_Before (N, Decl); | |
1907 | Analyze (Decl); | |
1908 | Analyze (Prag); | |
1909 | Set_Has_Pragma_Inline (Subp); | |
1910 | ||
76a69663 | 1911 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 1912 | Set_Is_Inlined (Subp); |
21d27997 | 1913 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
1914 | end if; |
1915 | ||
1916 | Spec := Subp; | |
1917 | end; | |
1918 | end if; | |
1919 | end if; | |
1920 | end Check_Inline_Pragma; | |
1921 | ||
7665e4bd AC |
1922 | -------------------------- |
1923 | -- Check_Missing_Return -- | |
1924 | -------------------------- | |
1925 | ||
1926 | procedure Check_Missing_Return is | |
1927 | Id : Entity_Id; | |
1928 | Missing_Ret : Boolean; | |
1929 | ||
1930 | begin | |
1931 | if Nkind (Body_Spec) = N_Function_Specification then | |
1932 | if Present (Spec_Id) then | |
1933 | Id := Spec_Id; | |
1934 | else | |
1935 | Id := Body_Id; | |
1936 | end if; | |
1937 | ||
fe5d3068 | 1938 | if Return_Present (Id) then |
7665e4bd AC |
1939 | Check_Returns (HSS, 'F', Missing_Ret); |
1940 | ||
1941 | if Missing_Ret then | |
1942 | Set_Has_Missing_Return (Id); | |
1943 | end if; | |
1944 | ||
1945 | elsif (Is_Generic_Subprogram (Id) | |
1946 | or else not Is_Machine_Code_Subprogram (Id)) | |
1947 | and then not Body_Deleted | |
1948 | then | |
1949 | Error_Msg_N ("missing RETURN statement in function body", N); | |
1950 | end if; | |
1951 | ||
fe5d3068 | 1952 | -- If procedure with No_Return, check returns |
607d0635 | 1953 | |
fe5d3068 YM |
1954 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
1955 | and then Present (Spec_Id) | |
1956 | and then No_Return (Spec_Id) | |
607d0635 | 1957 | then |
fe5d3068 YM |
1958 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
1959 | end if; | |
1960 | ||
ad05f2e9 | 1961 | -- Special checks in SPARK mode |
fe5d3068 YM |
1962 | |
1963 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 1964 | |
ad05f2e9 | 1965 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
1966 | |
1967 | declare | |
1968 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
1969 | begin | |
1970 | if Present (Stat) | |
7394c8cc AC |
1971 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
1972 | N_Extended_Return_Statement) | |
fe5d3068 | 1973 | then |
2ba431e5 | 1974 | Check_SPARK_Restriction |
fe5d3068 YM |
1975 | ("last statement in function should be RETURN", Stat); |
1976 | end if; | |
1977 | end; | |
1978 | ||
ad05f2e9 | 1979 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
1980 | |
1981 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
1982 | if Present (Spec_Id) then |
1983 | Id := Spec_Id; | |
1984 | else | |
1985 | Id := Body_Id; | |
1986 | end if; | |
1987 | ||
8d606a78 RD |
1988 | -- Would be nice to point to return statement here, can we |
1989 | -- borrow the Check_Returns procedure here ??? | |
1990 | ||
607d0635 | 1991 | if Return_Present (Id) then |
2ba431e5 | 1992 | Check_SPARK_Restriction |
fe5d3068 | 1993 | ("procedure should not have RETURN", N); |
607d0635 | 1994 | end if; |
7665e4bd AC |
1995 | end if; |
1996 | end Check_Missing_Return; | |
1997 | ||
d44202ba HK |
1998 | ----------------------- |
1999 | -- Disambiguate_Spec -- | |
2000 | ----------------------- | |
2001 | ||
2002 | function Disambiguate_Spec return Entity_Id is | |
2003 | Priv_Spec : Entity_Id; | |
2004 | Spec_N : Entity_Id; | |
2005 | ||
2006 | procedure Replace_Types (To_Corresponding : Boolean); | |
2007 | -- Depending on the flag, replace the type of formal parameters of | |
2008 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2009 | -- the corresponding record type or the other way around. | |
2010 | ||
2011 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2012 | Formal : Entity_Id; | |
2013 | Formal_Typ : Entity_Id; | |
2014 | ||
2015 | begin | |
2016 | Formal := First_Formal (Body_Id); | |
2017 | while Present (Formal) loop | |
2018 | Formal_Typ := Etype (Formal); | |
2019 | ||
df3e68b1 HK |
2020 | if Is_Class_Wide_Type (Formal_Typ) then |
2021 | Formal_Typ := Root_Type (Formal_Typ); | |
2022 | end if; | |
2023 | ||
d44202ba HK |
2024 | -- From concurrent type to corresponding record |
2025 | ||
2026 | if To_Corresponding then | |
2027 | if Is_Concurrent_Type (Formal_Typ) | |
2028 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
2029 | and then Present (Interfaces ( | |
2030 | Corresponding_Record_Type (Formal_Typ))) | |
2031 | then | |
2032 | Set_Etype (Formal, | |
2033 | Corresponding_Record_Type (Formal_Typ)); | |
2034 | end if; | |
2035 | ||
2036 | -- From corresponding record to concurrent type | |
2037 | ||
2038 | else | |
2039 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2040 | and then Present (Interfaces (Formal_Typ)) | |
2041 | then | |
2042 | Set_Etype (Formal, | |
2043 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2044 | end if; | |
2045 | end if; | |
2046 | ||
2047 | Next_Formal (Formal); | |
2048 | end loop; | |
2049 | end Replace_Types; | |
2050 | ||
2051 | -- Start of processing for Disambiguate_Spec | |
2052 | ||
2053 | begin | |
2054 | -- Try to retrieve the specification of the body as is. All error | |
2055 | -- messages are suppressed because the body may not have a spec in | |
2056 | -- its current state. | |
2057 | ||
2058 | Spec_N := Find_Corresponding_Spec (N, False); | |
2059 | ||
2060 | -- It is possible that this is the body of a primitive declared | |
2061 | -- between a private and a full view of a concurrent type. The | |
2062 | -- controlling parameter of the spec carries the concurrent type, | |
2063 | -- not the corresponding record type as transformed by Analyze_ | |
2064 | -- Subprogram_Specification. In such cases, we undo the change | |
2065 | -- made by the analysis of the specification and try to find the | |
2066 | -- spec again. | |
766d7add | 2067 | |
8198b93d HK |
2068 | -- Note that wrappers already have their corresponding specs and |
2069 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2070 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2071 | -- original concurrent status. |
d44202ba | 2072 | |
8198b93d HK |
2073 | if No (Spec_N) |
2074 | or else Is_Primitive_Wrapper (Spec_N) | |
2075 | then | |
d44202ba HK |
2076 | -- Restore all references of corresponding record types to the |
2077 | -- original concurrent types. | |
2078 | ||
2079 | Replace_Types (To_Corresponding => False); | |
2080 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2081 | ||
2082 | -- The current body truly belongs to a primitive declared between | |
2083 | -- a private and a full view. We leave the modified body as is, | |
2084 | -- and return the true spec. | |
2085 | ||
2086 | if Present (Priv_Spec) | |
2087 | and then Is_Private_Primitive (Priv_Spec) | |
2088 | then | |
2089 | return Priv_Spec; | |
2090 | end if; | |
2091 | ||
2092 | -- In case that this is some sort of error, restore the original | |
2093 | -- state of the body. | |
2094 | ||
2095 | Replace_Types (To_Corresponding => True); | |
2096 | end if; | |
2097 | ||
2098 | return Spec_N; | |
2099 | end Disambiguate_Spec; | |
2100 | ||
2101 | ------------------------------------- | |
2102 | -- Is_Private_Concurrent_Primitive -- | |
2103 | ------------------------------------- | |
2104 | ||
2105 | function Is_Private_Concurrent_Primitive | |
2106 | (Subp_Id : Entity_Id) return Boolean | |
2107 | is | |
2108 | Formal_Typ : Entity_Id; | |
2109 | ||
2110 | begin | |
2111 | if Present (First_Formal (Subp_Id)) then | |
2112 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2113 | ||
2114 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2115 | if Is_Class_Wide_Type (Formal_Typ) then |
2116 | Formal_Typ := Root_Type (Formal_Typ); | |
2117 | end if; | |
2118 | ||
d44202ba HK |
2119 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2120 | end if; | |
2121 | ||
2122 | -- The type of the first formal is a concurrent tagged type with | |
2123 | -- a private view. | |
2124 | ||
2125 | return | |
2126 | Is_Concurrent_Type (Formal_Typ) | |
2127 | and then Is_Tagged_Type (Formal_Typ) | |
2128 | and then Has_Private_Declaration (Formal_Typ); | |
2129 | end if; | |
2130 | ||
2131 | return False; | |
2132 | end Is_Private_Concurrent_Primitive; | |
2133 | ||
76a69663 ES |
2134 | ---------------------------- |
2135 | -- Set_Trivial_Subprogram -- | |
2136 | ---------------------------- | |
2137 | ||
2138 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2139 | Nxt : constant Node_Id := Next (N); | |
2140 | ||
2141 | begin | |
2142 | Set_Is_Trivial_Subprogram (Body_Id); | |
2143 | ||
2144 | if Present (Spec_Id) then | |
2145 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2146 | end if; | |
2147 | ||
2148 | if Present (Nxt) | |
2149 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2150 | and then No (Next (Nxt)) | |
2151 | and then Present (Expression (Nxt)) | |
2152 | and then Is_Entity_Name (Expression (Nxt)) | |
2153 | then | |
2154 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2155 | end if; | |
2156 | end Set_Trivial_Subprogram; | |
2157 | ||
758c442c GD |
2158 | --------------------------------- |
2159 | -- Verify_Overriding_Indicator -- | |
2160 | --------------------------------- | |
2161 | ||
2162 | procedure Verify_Overriding_Indicator is | |
2163 | begin | |
21d27997 RD |
2164 | if Must_Override (Body_Spec) then |
2165 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
2166 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2167 | then | |
2168 | null; | |
2169 | ||
038140ed | 2170 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2171 | Error_Msg_NE |
21d27997 RD |
2172 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
2173 | end if; | |
758c442c | 2174 | |
5d37ba92 | 2175 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2176 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2177 | Error_Msg_NE |
5d37ba92 | 2178 | ("subprogram& overrides inherited operation", |
76a69663 | 2179 | Body_Spec, Spec_Id); |
5d37ba92 | 2180 | |
21d27997 RD |
2181 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
2182 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2183 | then | |
ed2233dc | 2184 | Error_Msg_NE |
21d27997 RD |
2185 | ("subprogram & overrides predefined operator ", |
2186 | Body_Spec, Spec_Id); | |
2187 | ||
618fb570 AC |
2188 | -- If this is not a primitive operation or protected subprogram, |
2189 | -- then the overriding indicator is altogether illegal. | |
5d37ba92 | 2190 | |
618fb570 AC |
2191 | elsif not Is_Primitive (Spec_Id) |
2192 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type | |
2193 | then | |
ed2233dc | 2194 | Error_Msg_N |
19d846a0 RD |
2195 | ("overriding indicator only allowed " & |
2196 | "if subprogram is primitive", | |
2197 | Body_Spec); | |
5d37ba92 | 2198 | end if; |
235f4375 | 2199 | |
806f6d37 | 2200 | elsif Style_Check |
038140ed | 2201 | and then Present (Overridden_Operation (Spec_Id)) |
235f4375 AC |
2202 | then |
2203 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2204 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
2205 | |
2206 | elsif Style_Check | |
2207 | and then Can_Override_Operator (Spec_Id) | |
2208 | and then not Is_Predefined_File_Name | |
2209 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
2210 | then | |
2211 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2212 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
2213 | end if; |
2214 | end Verify_Overriding_Indicator; | |
2215 | ||
b1b543d2 | 2216 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 2217 | |
996ae0b0 | 2218 | begin |
82c80734 RD |
2219 | -- Generic subprograms are handled separately. They always have a |
2220 | -- generic specification. Determine whether current scope has a | |
2221 | -- previous declaration. | |
996ae0b0 | 2222 | |
82c80734 RD |
2223 | -- If the subprogram body is defined within an instance of the same |
2224 | -- name, the instance appears as a package renaming, and will be hidden | |
2225 | -- within the subprogram. | |
996ae0b0 RK |
2226 | |
2227 | if Present (Prev_Id) | |
2228 | and then not Is_Overloadable (Prev_Id) | |
2229 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
2230 | or else Comes_From_Source (Prev_Id)) | |
2231 | then | |
fbf5a39b | 2232 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 RK |
2233 | Spec_Id := Prev_Id; |
2234 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2235 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2236 | ||
2237 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
2238 | |
2239 | if Nkind (N) = N_Subprogram_Body then | |
2240 | HSS := Handled_Statement_Sequence (N); | |
2241 | Check_Missing_Return; | |
2242 | end if; | |
2243 | ||
996ae0b0 RK |
2244 | return; |
2245 | ||
2246 | else | |
82c80734 RD |
2247 | -- Previous entity conflicts with subprogram name. Attempting to |
2248 | -- enter name will post error. | |
996ae0b0 RK |
2249 | |
2250 | Enter_Name (Body_Id); | |
2251 | return; | |
2252 | end if; | |
2253 | ||
82c80734 RD |
2254 | -- Non-generic case, find the subprogram declaration, if one was seen, |
2255 | -- or enter new overloaded entity in the current scope. If the | |
2256 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
2257 | -- part of the context of one of its subunits. No need to redo the | |
2258 | -- analysis. | |
996ae0b0 RK |
2259 | |
2260 | elsif Prev_Id = Body_Id | |
2261 | and then Has_Completion (Body_Id) | |
2262 | then | |
2263 | return; | |
2264 | ||
2265 | else | |
fbf5a39b | 2266 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
2267 | |
2268 | if Nkind (N) = N_Subprogram_Body_Stub | |
2269 | or else No (Corresponding_Spec (N)) | |
2270 | then | |
d44202ba HK |
2271 | if Is_Private_Concurrent_Primitive (Body_Id) then |
2272 | Spec_Id := Disambiguate_Spec; | |
2273 | else | |
2274 | Spec_Id := Find_Corresponding_Spec (N); | |
2275 | end if; | |
996ae0b0 RK |
2276 | |
2277 | -- If this is a duplicate body, no point in analyzing it | |
2278 | ||
2279 | if Error_Posted (N) then | |
2280 | return; | |
2281 | end if; | |
2282 | ||
82c80734 RD |
2283 | -- A subprogram body should cause freezing of its own declaration, |
2284 | -- but if there was no previous explicit declaration, then the | |
2285 | -- subprogram will get frozen too late (there may be code within | |
2286 | -- the body that depends on the subprogram having been frozen, | |
2287 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 2288 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
2289 | -- Finally, if the return type is an anonymous access to protected |
2290 | -- subprogram, it must be frozen before the body because its | |
2291 | -- expansion has generated an equivalent type that is used when | |
2292 | -- elaborating the body. | |
996ae0b0 RK |
2293 | |
2294 | if No (Spec_Id) then | |
2295 | Freeze_Before (N, Body_Id); | |
2296 | ||
2297 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
2298 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
2299 | |
2300 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
2301 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 2302 | end if; |
a38ff9b1 | 2303 | |
996ae0b0 RK |
2304 | else |
2305 | Spec_Id := Corresponding_Spec (N); | |
2306 | end if; | |
2307 | end if; | |
2308 | ||
82c80734 RD |
2309 | -- Do not inline any subprogram that contains nested subprograms, since |
2310 | -- the backend inlining circuit seems to generate uninitialized | |
07fc65c4 | 2311 | -- references in this case. We know this happens in the case of front |
82c80734 RD |
2312 | -- end ZCX support, but it also appears it can happen in other cases as |
2313 | -- well. The backend often rejects attempts to inline in the case of | |
2314 | -- nested procedures anyway, so little if anything is lost by this. | |
2315 | -- Note that this is test is for the benefit of the back-end. There is | |
2316 | -- a separate test for front-end inlining that also rejects nested | |
2317 | -- subprograms. | |
07fc65c4 GB |
2318 | |
2319 | -- Do not do this test if errors have been detected, because in some | |
2320 | -- error cases, this code blows up, and we don't need it anyway if | |
2321 | -- there have been errors, since we won't get to the linker anyway. | |
2322 | ||
82c80734 RD |
2323 | if Comes_From_Source (Body_Id) |
2324 | and then Serious_Errors_Detected = 0 | |
2325 | then | |
07fc65c4 GB |
2326 | P_Ent := Body_Id; |
2327 | loop | |
2328 | P_Ent := Scope (P_Ent); | |
2329 | exit when No (P_Ent) or else P_Ent = Standard_Standard; | |
2330 | ||
fbf5a39b | 2331 | if Is_Subprogram (P_Ent) then |
07fc65c4 GB |
2332 | Set_Is_Inlined (P_Ent, False); |
2333 | ||
2334 | if Comes_From_Source (P_Ent) | |
07fc65c4 GB |
2335 | and then Has_Pragma_Inline (P_Ent) |
2336 | then | |
fbf5a39b AC |
2337 | Cannot_Inline |
2338 | ("cannot inline& (nested subprogram)?", | |
2339 | N, P_Ent); | |
07fc65c4 GB |
2340 | end if; |
2341 | end if; | |
2342 | end loop; | |
2343 | end if; | |
2344 | ||
e660dbf7 JM |
2345 | Check_Inline_Pragma (Spec_Id); |
2346 | ||
701b7fbb RD |
2347 | -- Deal with special case of a fully private operation in the body of |
2348 | -- the protected type. We must create a declaration for the subprogram, | |
2349 | -- in order to attach the protected subprogram that will be used in | |
2350 | -- internal calls. We exclude compiler generated bodies from the | |
2351 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 2352 | |
996ae0b0 RK |
2353 | if No (Spec_Id) |
2354 | and then Comes_From_Source (N) | |
2355 | and then Is_Protected_Type (Current_Scope) | |
2356 | then | |
47bfea3a | 2357 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 2358 | end if; |
996ae0b0 | 2359 | |
5334d18f | 2360 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 2361 | |
701b7fbb | 2362 | if Present (Spec_Id) then |
996ae0b0 | 2363 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 2364 | Verify_Overriding_Indicator; |
5d37ba92 ES |
2365 | |
2366 | -- In general, the spec will be frozen when we start analyzing the | |
2367 | -- body. However, for internally generated operations, such as | |
2368 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
2369 | -- results, the spec may not have been frozen by the time we expand |
2370 | -- the freeze actions that include the bodies. In particular, extra | |
2371 | -- formals for accessibility or for return-in-place may need to be | |
2372 | -- generated. Freeze nodes, if any, are inserted before the current | |
2373 | -- body. These freeze actions are also needed in ASIS mode to enable | |
2374 | -- the proper back-annotations. | |
5d37ba92 ES |
2375 | |
2376 | if not Is_Frozen (Spec_Id) | |
7134062a | 2377 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
2378 | then |
2379 | -- Force the generation of its freezing node to ensure proper | |
2380 | -- management of access types in the backend. | |
2381 | ||
2382 | -- This is definitely needed for some cases, but it is not clear | |
2383 | -- why, to be investigated further??? | |
2384 | ||
2385 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 2386 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 2387 | end if; |
996ae0b0 RK |
2388 | end if; |
2389 | ||
a5d83d61 AC |
2390 | -- Mark presence of postcondition procedure in current scope and mark |
2391 | -- the procedure itself as needing debug info. The latter is important | |
2392 | -- when analyzing decision coverage (for example, for MC/DC coverage). | |
7ca78bba | 2393 | |
0dabde3a ES |
2394 | if Chars (Body_Id) = Name_uPostconditions then |
2395 | Set_Has_Postconditions (Current_Scope); | |
a5d83d61 | 2396 | Set_Debug_Info_Needed (Body_Id); |
0dabde3a ES |
2397 | end if; |
2398 | ||
996ae0b0 RK |
2399 | -- Place subprogram on scope stack, and make formals visible. If there |
2400 | -- is a spec, the visible entity remains that of the spec. | |
2401 | ||
2402 | if Present (Spec_Id) then | |
07fc65c4 | 2403 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
2404 | |
2405 | if Is_Child_Unit (Spec_Id) then | |
2406 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
2407 | end if; | |
2408 | ||
fbf5a39b AC |
2409 | if Style_Check then |
2410 | Style.Check_Identifier (Body_Id, Spec_Id); | |
2411 | end if; | |
996ae0b0 RK |
2412 | |
2413 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2414 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2415 | ||
f937473f | 2416 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 2417 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
996ae0b0 | 2418 | return; |
21d27997 | 2419 | |
996ae0b0 RK |
2420 | else |
2421 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
2422 | Set_Has_Completion (Spec_Id); | |
2423 | ||
2424 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 2425 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
2426 | end if; |
2427 | ||
2428 | -- If this is a body generated for a renaming, do not check for | |
2429 | -- full conformance. The check is redundant, because the spec of | |
2430 | -- the body is a copy of the spec in the renaming declaration, | |
2431 | -- and the test can lead to spurious errors on nested defaults. | |
2432 | ||
2433 | if Present (Spec_Decl) | |
996ae0b0 | 2434 | and then not Comes_From_Source (N) |
93a81b02 GB |
2435 | and then |
2436 | (Nkind (Original_Node (Spec_Decl)) = | |
d2f97d3e GB |
2437 | N_Subprogram_Renaming_Declaration |
2438 | or else (Present (Corresponding_Body (Spec_Decl)) | |
2439 | and then | |
2440 | Nkind (Unit_Declaration_Node | |
2441 | (Corresponding_Body (Spec_Decl))) = | |
2442 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
2443 | then |
2444 | Conformant := True; | |
cabe9abc AC |
2445 | |
2446 | -- Conversely, the spec may have been generated for specless body | |
2447 | -- with an inline pragma. | |
2448 | ||
2449 | elsif Comes_From_Source (N) | |
2450 | and then not Comes_From_Source (Spec_Id) | |
2451 | and then Has_Pragma_Inline (Spec_Id) | |
2452 | then | |
2453 | Conformant := True; | |
76a69663 | 2454 | |
996ae0b0 RK |
2455 | else |
2456 | Check_Conformance | |
2457 | (Body_Id, Spec_Id, | |
76a69663 | 2458 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
2459 | end if; |
2460 | ||
2461 | -- If the body is not fully conformant, we have to decide if we | |
2462 | -- should analyze it or not. If it has a really messed up profile | |
2463 | -- then we probably should not analyze it, since we will get too | |
2464 | -- many bogus messages. | |
2465 | ||
2466 | -- Our decision is to go ahead in the non-fully conformant case | |
2467 | -- only if it is at least mode conformant with the spec. Note | |
2468 | -- that the call to Check_Fully_Conformant has issued the proper | |
2469 | -- error messages to complain about the lack of conformance. | |
2470 | ||
2471 | if not Conformant | |
2472 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
2473 | then | |
2474 | return; | |
2475 | end if; | |
2476 | end if; | |
2477 | ||
996ae0b0 | 2478 | if Spec_Id /= Body_Id then |
fbf5a39b | 2479 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
2480 | end if; |
2481 | ||
2482 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
2483 | Set_Corresponding_Spec (N, Spec_Id); | |
758c442c | 2484 | |
5d37ba92 ES |
2485 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
2486 | -- of a concurrent type, the type of the first parameter has been | |
2487 | -- replaced with the corresponding record, which is the proper | |
2488 | -- run-time structure to use. However, within the body there may | |
2489 | -- be uses of the formals that depend on primitive operations | |
2490 | -- of the type (in particular calls in prefixed form) for which | |
2491 | -- we need the original concurrent type. The operation may have | |
2492 | -- several controlling formals, so the replacement must be done | |
2493 | -- for all of them. | |
758c442c GD |
2494 | |
2495 | if Comes_From_Source (Spec_Id) | |
2496 | and then Present (First_Entity (Spec_Id)) | |
2497 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
2498 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
5d37ba92 | 2499 | and then |
ce2b6ba5 | 2500 | Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
5d37ba92 ES |
2501 | and then |
2502 | Present | |
21d27997 RD |
2503 | (Corresponding_Concurrent_Type |
2504 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 2505 | then |
5d37ba92 ES |
2506 | declare |
2507 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
2508 | Form : Entity_Id; | |
2509 | ||
2510 | begin | |
2511 | Form := First_Formal (Spec_Id); | |
2512 | while Present (Form) loop | |
2513 | if Etype (Form) = Typ then | |
2514 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
2515 | end if; | |
2516 | ||
2517 | Next_Formal (Form); | |
2518 | end loop; | |
2519 | end; | |
758c442c GD |
2520 | end if; |
2521 | ||
21d27997 RD |
2522 | -- Make the formals visible, and place subprogram on scope stack. |
2523 | -- This is also the point at which we set Last_Real_Spec_Entity | |
2524 | -- to mark the entities which will not be moved to the body. | |
758c442c | 2525 | |
996ae0b0 | 2526 | Install_Formals (Spec_Id); |
21d27997 | 2527 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
0a36105d | 2528 | Push_Scope (Spec_Id); |
996ae0b0 RK |
2529 | |
2530 | -- Make sure that the subprogram is immediately visible. For | |
2531 | -- child units that have no separate spec this is indispensable. | |
2532 | -- Otherwise it is safe albeit redundant. | |
2533 | ||
2534 | Set_Is_Immediately_Visible (Spec_Id); | |
2535 | end if; | |
2536 | ||
2537 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
2538 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
2539 | Set_Scope (Body_Id, Scope (Spec_Id)); | |
ec4867fa | 2540 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
996ae0b0 RK |
2541 | |
2542 | -- Case of subprogram body with no previous spec | |
2543 | ||
2544 | else | |
3e5daac4 AC |
2545 | -- Check for style warning required |
2546 | ||
996ae0b0 | 2547 | if Style_Check |
3e5daac4 AC |
2548 | |
2549 | -- Only apply check for source level subprograms for which checks | |
2550 | -- have not been suppressed. | |
2551 | ||
996ae0b0 RK |
2552 | and then Comes_From_Source (Body_Id) |
2553 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
2554 | |
2555 | -- No warnings within an instance | |
2556 | ||
996ae0b0 | 2557 | and then not In_Instance |
3e5daac4 | 2558 | |
b0186f71 | 2559 | -- No warnings for expression functions |
3e5daac4 | 2560 | |
b0186f71 | 2561 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
2562 | then |
2563 | Style.Body_With_No_Spec (N); | |
2564 | end if; | |
2565 | ||
2566 | New_Overloaded_Entity (Body_Id); | |
2567 | ||
2568 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
2569 | Set_Acts_As_Spec (N); | |
2570 | Generate_Definition (Body_Id); | |
dac3bede | 2571 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
fbf5a39b AC |
2572 | Generate_Reference |
2573 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 2574 | Install_Formals (Body_Id); |
0a36105d | 2575 | Push_Scope (Body_Id); |
996ae0b0 | 2576 | end if; |
dbe36d67 AC |
2577 | |
2578 | -- For stubs and bodies with no previous spec, generate references to | |
2579 | -- formals. | |
2580 | ||
2581 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
2582 | end if; |
2583 | ||
76a69663 ES |
2584 | -- If the return type is an anonymous access type whose designated type |
2585 | -- is the limited view of a class-wide type and the non-limited view is | |
2586 | -- available, update the return type accordingly. | |
ec4867fa | 2587 | |
0791fbe9 | 2588 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
2589 | and then Comes_From_Source (N) |
2590 | then | |
2591 | declare | |
ec4867fa | 2592 | Etyp : Entity_Id; |
0a36105d | 2593 | Rtyp : Entity_Id; |
ec4867fa ES |
2594 | |
2595 | begin | |
0a36105d JM |
2596 | Rtyp := Etype (Current_Scope); |
2597 | ||
2598 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
2599 | Etyp := Directly_Designated_Type (Rtyp); | |
2600 | ||
2601 | if Is_Class_Wide_Type (Etyp) | |
2602 | and then From_With_Type (Etyp) | |
2603 | then | |
2604 | Set_Directly_Designated_Type | |
2605 | (Etype (Current_Scope), Available_View (Etyp)); | |
2606 | end if; | |
2607 | end if; | |
ec4867fa ES |
2608 | end; |
2609 | end if; | |
2610 | ||
996ae0b0 RK |
2611 | -- If this is the proper body of a stub, we must verify that the stub |
2612 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 2613 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
2614 | -- only required for subprograms that come from source. |
2615 | ||
2616 | if Nkind (Parent (N)) = N_Subunit | |
2617 | and then Comes_From_Source (N) | |
2618 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
2619 | and then Nkind (Corresponding_Stub (Parent (N))) = |
2620 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
2621 | then |
2622 | declare | |
fbf5a39b AC |
2623 | Old_Id : constant Entity_Id := |
2624 | Defining_Entity | |
2625 | (Specification (Corresponding_Stub (Parent (N)))); | |
2626 | ||
996ae0b0 | 2627 | Conformant : Boolean := False; |
996ae0b0 RK |
2628 | |
2629 | begin | |
2630 | if No (Spec_Id) then | |
2631 | Check_Fully_Conformant (Body_Id, Old_Id); | |
2632 | ||
2633 | else | |
2634 | Check_Conformance | |
2635 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
2636 | ||
2637 | if not Conformant then | |
2638 | ||
dbe36d67 AC |
2639 | -- The stub was taken to be a new declaration. Indicate that |
2640 | -- it lacks a body. | |
996ae0b0 RK |
2641 | |
2642 | Set_Has_Completion (Old_Id, False); | |
2643 | end if; | |
2644 | end if; | |
2645 | end; | |
2646 | end if; | |
2647 | ||
2648 | Set_Has_Completion (Body_Id); | |
2649 | Check_Eliminated (Body_Id); | |
2650 | ||
2651 | if Nkind (N) = N_Subprogram_Body_Stub then | |
2652 | return; | |
2653 | ||
ec4867fa | 2654 | elsif Present (Spec_Id) |
996ae0b0 | 2655 | and then Expander_Active |
e660dbf7 | 2656 | and then |
800621e0 | 2657 | (Has_Pragma_Inline_Always (Spec_Id) |
e660dbf7 | 2658 | or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining)) |
996ae0b0 | 2659 | then |
e660dbf7 | 2660 | Build_Body_To_Inline (N, Spec_Id); |
996ae0b0 RK |
2661 | end if; |
2662 | ||
0ab80019 | 2663 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 2664 | -- of the specification we have to install the private withed units. |
21d27997 | 2665 | -- This holds for child units as well. |
9bc856dd AC |
2666 | |
2667 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 2668 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
2669 | then |
2670 | Install_Private_With_Clauses (Body_Id); | |
2671 | end if; | |
2672 | ||
ec4867fa ES |
2673 | Check_Anonymous_Return; |
2674 | ||
fdce4bb7 JM |
2675 | -- Set the Protected_Formal field of each extra formal of the protected |
2676 | -- subprogram to reference the corresponding extra formal of the | |
2677 | -- subprogram that implements it. For regular formals this occurs when | |
2678 | -- the protected subprogram's declaration is expanded, but the extra | |
2679 | -- formals don't get created until the subprogram is frozen. We need to | |
2680 | -- do this before analyzing the protected subprogram's body so that any | |
2681 | -- references to the original subprogram's extra formals will be changed | |
2682 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
2683 | ||
2684 | if Present (Spec_Id) | |
2685 | and then Is_Protected_Type (Scope (Spec_Id)) | |
2686 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
2687 | then | |
2688 | declare | |
2689 | Impl_Subp : constant Entity_Id := | |
2690 | Protected_Body_Subprogram (Spec_Id); | |
2691 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
2692 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
2693 | begin |
2694 | while Present (Prot_Ext_Formal) loop | |
2695 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 2696 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
2697 | Next_Formal_With_Extras (Prot_Ext_Formal); |
2698 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
2699 | end loop; | |
2700 | end; | |
2701 | end if; | |
2702 | ||
0868e09c | 2703 | -- Now we can go on to analyze the body |
996ae0b0 RK |
2704 | |
2705 | HSS := Handled_Statement_Sequence (N); | |
2706 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 2707 | |
483361a6 AC |
2708 | -- Deal with preconditions and postconditions. In formal verification |
2709 | -- mode, we keep pre- and postconditions attached to entities rather | |
2710 | -- than inserted in the code, in order to facilitate a distinct | |
2711 | -- treatment for them. | |
21d27997 | 2712 | |
56812278 | 2713 | if not Alfa_Mode then |
483361a6 AC |
2714 | Process_PPCs (N, Spec_Id, Body_Id); |
2715 | end if; | |
21d27997 | 2716 | |
f3d0f304 | 2717 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
2718 | -- for discriminals and privals and finally a declaration for the entry |
2719 | -- family index (if applicable). This form of early expansion is done | |
2720 | -- when the Expander is active because Install_Private_Data_Declarations | |
2721 | -- references entities which were created during regular expansion. | |
2722 | ||
da94696d | 2723 | if Full_Expander_Active |
21d27997 RD |
2724 | and then Comes_From_Source (N) |
2725 | and then Present (Prot_Typ) | |
2726 | and then Present (Spec_Id) | |
2727 | and then not Is_Eliminated (Spec_Id) | |
2728 | then | |
2729 | Install_Private_Data_Declarations | |
2730 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
2731 | end if; | |
2732 | ||
2733 | -- Analyze the declarations (this call will analyze the precondition | |
2734 | -- Check pragmas we prepended to the list, as well as the declaration | |
2735 | -- of the _Postconditions procedure). | |
2736 | ||
996ae0b0 | 2737 | Analyze_Declarations (Declarations (N)); |
21d27997 RD |
2738 | |
2739 | -- Check completion, and analyze the statements | |
2740 | ||
996ae0b0 | 2741 | Check_Completion; |
33931112 | 2742 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 2743 | Analyze (HSS); |
21d27997 RD |
2744 | |
2745 | -- Deal with end of scope processing for the body | |
2746 | ||
07fc65c4 | 2747 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
2748 | End_Scope; |
2749 | Check_Subprogram_Order (N); | |
c37bb106 | 2750 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
2751 | |
2752 | -- If we have a separate spec, then the analysis of the declarations | |
2753 | -- caused the entities in the body to be chained to the spec id, but | |
2754 | -- we want them chained to the body id. Only the formal parameters | |
2755 | -- end up chained to the spec id in this case. | |
2756 | ||
2757 | if Present (Spec_Id) then | |
2758 | ||
d39d6bb8 | 2759 | -- We must conform to the categorization of our spec |
996ae0b0 | 2760 | |
d39d6bb8 | 2761 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 2762 | |
d39d6bb8 RD |
2763 | -- And if this is a child unit, the parent units must conform |
2764 | ||
2765 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
2766 | Validate_Categorization_Dependency |
2767 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
2768 | end if; | |
2769 | ||
21d27997 RD |
2770 | -- Here is where we move entities from the spec to the body |
2771 | ||
2772 | -- Case where there are entities that stay with the spec | |
2773 | ||
2774 | if Present (Last_Real_Spec_Entity) then | |
2775 | ||
dbe36d67 AC |
2776 | -- No body entities (happens when the only real spec entities come |
2777 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
2778 | |
2779 | if No (Last_Entity (Body_Id)) then | |
2780 | Set_First_Entity | |
2781 | (Body_Id, Next_Entity (Last_Real_Spec_Entity)); | |
2782 | ||
2783 | -- Body entities present (formals), so chain stuff past them | |
2784 | ||
2785 | else | |
2786 | Set_Next_Entity | |
2787 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
2788 | end if; | |
2789 | ||
2790 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 2791 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
2792 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
2793 | ||
dbe36d67 AC |
2794 | -- Case where there are no spec entities, in this case there can be |
2795 | -- no body entities either, so just move everything. | |
996ae0b0 RK |
2796 | |
2797 | else | |
21d27997 | 2798 | pragma Assert (No (Last_Entity (Body_Id))); |
996ae0b0 RK |
2799 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
2800 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
2801 | Set_First_Entity (Spec_Id, Empty); | |
2802 | Set_Last_Entity (Spec_Id, Empty); | |
2803 | end if; | |
2804 | end if; | |
2805 | ||
7665e4bd | 2806 | Check_Missing_Return; |
996ae0b0 | 2807 | |
82c80734 | 2808 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
2809 | -- the body of the procedure. But first we deal with a special case |
2810 | -- where we want to modify this check. If the body of the subprogram | |
2811 | -- starts with a raise statement or its equivalent, or if the body | |
2812 | -- consists entirely of a null statement, then it is pretty obvious | |
2813 | -- that it is OK to not reference the parameters. For example, this | |
2814 | -- might be the following common idiom for a stubbed function: | |
82c80734 RD |
2815 | -- statement of the procedure raises an exception. In particular this |
2816 | -- deals with the common idiom of a stubbed function, which might | |
dbe36d67 | 2817 | -- appear as something like: |
fbf5a39b AC |
2818 | |
2819 | -- function F (A : Integer) return Some_Type; | |
2820 | -- X : Some_Type; | |
2821 | -- begin | |
2822 | -- raise Program_Error; | |
2823 | -- return X; | |
2824 | -- end F; | |
2825 | ||
76a69663 ES |
2826 | -- Here the purpose of X is simply to satisfy the annoying requirement |
2827 | -- in Ada that there be at least one return, and we certainly do not | |
2828 | -- want to go posting warnings on X that it is not initialized! On | |
2829 | -- the other hand, if X is entirely unreferenced that should still | |
2830 | -- get a warning. | |
2831 | ||
2832 | -- What we do is to detect these cases, and if we find them, flag the | |
2833 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
2834 | -- suppress unwanted warnings. For the case of the function stub above | |
2835 | -- we have a special test to set X as apparently assigned to suppress | |
2836 | -- the warning. | |
996ae0b0 RK |
2837 | |
2838 | declare | |
800621e0 | 2839 | Stm : Node_Id; |
996ae0b0 RK |
2840 | |
2841 | begin | |
0a36105d JM |
2842 | -- Skip initial labels (for one thing this occurs when we are in |
2843 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
2844 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 2845 | |
800621e0 | 2846 | Stm := First (Statements (HSS)); |
0a36105d JM |
2847 | while Nkind (Stm) = N_Label |
2848 | or else Nkind (Stm) in N_Push_xxx_Label | |
2849 | loop | |
996ae0b0 | 2850 | Next (Stm); |
0a36105d | 2851 | end loop; |
996ae0b0 | 2852 | |
fbf5a39b AC |
2853 | -- Do the test on the original statement before expansion |
2854 | ||
2855 | declare | |
2856 | Ostm : constant Node_Id := Original_Node (Stm); | |
2857 | ||
2858 | begin | |
76a69663 | 2859 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
2860 | |
2861 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
2862 | Set_Trivial_Subprogram (Stm); |
2863 | ||
f3d57416 | 2864 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
2865 | |
2866 | elsif Nkind (Stm) = N_Null_Statement | |
2867 | and then Comes_From_Source (Stm) | |
2868 | and then No (Next (Stm)) | |
2869 | then | |
2870 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
2871 | |
2872 | -- Check for explicit call cases which likely raise an exception | |
2873 | ||
2874 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
2875 | if Is_Entity_Name (Name (Ostm)) then | |
2876 | declare | |
2877 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
2878 | ||
2879 | begin | |
2880 | -- If the procedure is marked No_Return, then likely it | |
2881 | -- raises an exception, but in any case it is not coming | |
76a69663 | 2882 | -- back here, so turn on the flag. |
fbf5a39b | 2883 | |
f46faa08 AC |
2884 | if Present (Ent) |
2885 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
2886 | and then No_Return (Ent) |
2887 | then | |
76a69663 | 2888 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
2889 | end if; |
2890 | end; | |
2891 | end if; | |
2892 | end if; | |
2893 | end; | |
996ae0b0 RK |
2894 | end; |
2895 | ||
2896 | -- Check for variables that are never modified | |
2897 | ||
2898 | declare | |
2899 | E1, E2 : Entity_Id; | |
2900 | ||
2901 | begin | |
fbf5a39b | 2902 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
2903 | -- flags from out parameters to the corresponding entities in the |
2904 | -- body. The reason we do that is we want to post error flags on | |
2905 | -- the body entities, not the spec entities. | |
2906 | ||
2907 | if Present (Spec_Id) then | |
2908 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
2909 | while Present (E1) loop |
2910 | if Ekind (E1) = E_Out_Parameter then | |
2911 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 2912 | while Present (E2) loop |
996ae0b0 RK |
2913 | exit when Chars (E1) = Chars (E2); |
2914 | Next_Entity (E2); | |
2915 | end loop; | |
2916 | ||
fbf5a39b AC |
2917 | if Present (E2) then |
2918 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
2919 | end if; | |
996ae0b0 RK |
2920 | end if; |
2921 | ||
2922 | Next_Entity (E1); | |
2923 | end loop; | |
2924 | end if; | |
2925 | ||
0868e09c RD |
2926 | -- Check references in body unless it was deleted. Note that the |
2927 | -- check of Body_Deleted here is not just for efficiency, it is | |
2928 | -- necessary to avoid junk warnings on formal parameters. | |
2929 | ||
2930 | if not Body_Deleted then | |
2931 | Check_References (Body_Id); | |
2932 | end if; | |
996ae0b0 | 2933 | end; |
b1b543d2 | 2934 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 RK |
2935 | |
2936 | ------------------------------------ | |
2937 | -- Analyze_Subprogram_Declaration -- | |
2938 | ------------------------------------ | |
2939 | ||
2940 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
5d5832bc | 2941 | Loc : constant Source_Ptr := Sloc (N); |
0f1a6a0b | 2942 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc AC |
2943 | Designator : Entity_Id; |
2944 | Form : Node_Id; | |
5d5832bc | 2945 | Null_Body : Node_Id := Empty; |
996ae0b0 RK |
2946 | |
2947 | -- Start of processing for Analyze_Subprogram_Declaration | |
2948 | ||
2949 | begin | |
2ba431e5 | 2950 | -- Null procedures are not allowed in SPARK |
daec8eeb | 2951 | |
fe5d3068 | 2952 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
2953 | and then Null_Present (Specification (N)) |
2954 | then | |
2ba431e5 | 2955 | Check_SPARK_Restriction ("null procedure is not allowed", N); |
daec8eeb YM |
2956 | end if; |
2957 | ||
349ff68f | 2958 | -- For a null procedure, capture the profile before analysis, for |
c159409f AC |
2959 | -- expansion at the freeze point and at each point of call. The body |
2960 | -- will only be used if the procedure has preconditions. In that case | |
2961 | -- the body is analyzed at the freeze point. | |
5d5832bc AC |
2962 | |
2963 | if Nkind (Specification (N)) = N_Procedure_Specification | |
2964 | and then Null_Present (Specification (N)) | |
2965 | and then Expander_Active | |
2966 | then | |
2967 | Null_Body := | |
2968 | Make_Subprogram_Body (Loc, | |
2969 | Specification => | |
2970 | New_Copy_Tree (Specification (N)), | |
349ff68f AC |
2971 | Declarations => |
2972 | New_List, | |
5d5832bc AC |
2973 | Handled_Statement_Sequence => |
2974 | Make_Handled_Sequence_Of_Statements (Loc, | |
2975 | Statements => New_List (Make_Null_Statement (Loc)))); | |
2976 | ||
01957849 | 2977 | -- Create new entities for body and formals |
5d5832bc AC |
2978 | |
2979 | Set_Defining_Unit_Name (Specification (Null_Body), | |
2980 | Make_Defining_Identifier (Loc, Chars (Defining_Entity (N)))); | |
2981 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
2982 | ||
2983 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
2984 | while Present (Form) loop | |
2985 | Set_Defining_Identifier (Form, | |
2986 | Make_Defining_Identifier (Loc, | |
2987 | Chars (Defining_Identifier (Form)))); | |
718deaf1 AC |
2988 | |
2989 | -- Resolve the types of the formals now, because the freeze point | |
2990 | -- may appear in a different context, e.g. an instantiation. | |
2991 | ||
2992 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
2993 | Find_Type (Parameter_Type (Form)); | |
2994 | ||
2995 | elsif | |
2996 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
2997 | then | |
2998 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
2999 | ||
3000 | else | |
3001 | ||
3002 | -- the case of a null procedure with a formal that is an | |
3003 | -- access_to_subprogram type, and that is used as an actual | |
3004 | -- in an instantiation is left to the enthusiastic reader. | |
3005 | ||
3006 | null; | |
3007 | end if; | |
3008 | ||
5d5832bc AC |
3009 | Next (Form); |
3010 | end loop; | |
3011 | ||
3012 | if Is_Protected_Type (Current_Scope) then | |
ed2233dc | 3013 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
5d5832bc AC |
3014 | end if; |
3015 | end if; | |
3016 | ||
beacce02 | 3017 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
5d5832bc | 3018 | Generate_Definition (Designator); |
dac3bede | 3019 | -- ??? why this call, already in Analyze_Subprogram_Specification |
5d5832bc | 3020 | |
b1b543d2 BD |
3021 | if Debug_Flag_C then |
3022 | Write_Str ("==> subprogram spec "); | |
3023 | Write_Name (Chars (Designator)); | |
3024 | Write_Str (" from "); | |
3025 | Write_Location (Sloc (N)); | |
3026 | Write_Eol; | |
3027 | Indent; | |
3028 | end if; | |
3029 | ||
5d5832bc AC |
3030 | if Nkind (Specification (N)) = N_Procedure_Specification |
3031 | and then Null_Present (Specification (N)) | |
3032 | then | |
3033 | Set_Has_Completion (Designator); | |
996ae0b0 | 3034 | |
5d5832bc AC |
3035 | if Present (Null_Body) then |
3036 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
3037 | Set_Body_To_Inline (N, Null_Body); | |
3038 | Set_Is_Inlined (Designator); | |
3039 | end if; | |
3040 | end if; | |
996ae0b0 RK |
3041 | |
3042 | Validate_RCI_Subprogram_Declaration (N); | |
996ae0b0 RK |
3043 | New_Overloaded_Entity (Designator); |
3044 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 3045 | |
6ca063eb AC |
3046 | -- If the type of the first formal of the current subprogram is a |
3047 | -- nongeneric tagged private type, mark the subprogram as being a | |
3048 | -- private primitive. Ditto if this is a function with controlling | |
b7d5e87b AC |
3049 | -- result, and the return type is currently private. In both cases, |
3050 | -- the type of the controlling argument or result must be in the | |
3051 | -- current scope for the operation to be primitive. | |
6ca063eb AC |
3052 | |
3053 | if Has_Controlling_Result (Designator) | |
3054 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 3055 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
3056 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
3057 | then | |
3058 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 3059 | |
6ca063eb | 3060 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
3061 | declare |
3062 | Formal_Typ : constant Entity_Id := | |
3063 | Etype (First_Formal (Designator)); | |
3064 | begin | |
3065 | Set_Is_Private_Primitive (Designator, | |
3066 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 3067 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
3068 | and then Is_Private_Type (Formal_Typ) |
3069 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
3070 | end; | |
3071 | end if; | |
3072 | ||
ec4867fa ES |
3073 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
3074 | -- or null. | |
3075 | ||
0791fbe9 | 3076 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
3077 | and then Comes_From_Source (N) |
3078 | and then Is_Dispatching_Operation (Designator) | |
3079 | then | |
3080 | declare | |
3081 | E : Entity_Id; | |
3082 | Etyp : Entity_Id; | |
3083 | ||
3084 | begin | |
3085 | if Has_Controlling_Result (Designator) then | |
3086 | Etyp := Etype (Designator); | |
3087 | ||
3088 | else | |
3089 | E := First_Entity (Designator); | |
3090 | while Present (E) | |
3091 | and then Is_Formal (E) | |
3092 | and then not Is_Controlling_Formal (E) | |
3093 | loop | |
3094 | Next_Entity (E); | |
3095 | end loop; | |
3096 | ||
3097 | Etyp := Etype (E); | |
3098 | end if; | |
3099 | ||
3100 | if Is_Access_Type (Etyp) then | |
3101 | Etyp := Directly_Designated_Type (Etyp); | |
3102 | end if; | |
3103 | ||
3104 | if Is_Interface (Etyp) | |
f937473f | 3105 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa ES |
3106 | and then not (Ekind (Designator) = E_Procedure |
3107 | and then Null_Present (Specification (N))) | |
3108 | then | |
3109 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
ed2233dc | 3110 | Error_Msg_N |
ec4867fa ES |
3111 | ("(Ada 2005) interface subprogram % must be abstract or null", |
3112 | N); | |
3113 | end if; | |
3114 | end; | |
3115 | end if; | |
3116 | ||
fbf5a39b AC |
3117 | -- What is the following code for, it used to be |
3118 | ||
3119 | -- ??? Set_Suppress_Elaboration_Checks | |
3120 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
3121 | ||
3122 | -- The following seems equivalent, but a bit dubious | |
3123 | ||
3124 | if Elaboration_Checks_Suppressed (Designator) then | |
3125 | Set_Kill_Elaboration_Checks (Designator); | |
3126 | end if; | |
996ae0b0 RK |
3127 | |
3128 | if Scop /= Standard_Standard | |
3129 | and then not Is_Child_Unit (Designator) | |
3130 | then | |
fbf5a39b | 3131 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 | 3132 | else |
e895b435 | 3133 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 3134 | |
0a36105d | 3135 | Push_Scope (Designator); |
996ae0b0 RK |
3136 | Set_Categorization_From_Pragmas (N); |
3137 | Validate_Categorization_Dependency (N, Designator); | |
3138 | Pop_Scope; | |
3139 | end if; | |
3140 | ||
3141 | -- For a compilation unit, set body required. This flag will only be | |
3142 | -- reset if a valid Import or Interface pragma is processed later on. | |
3143 | ||
3144 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
3145 | Set_Body_Required (Parent (N), True); | |
758c442c | 3146 | |
0791fbe9 | 3147 | if Ada_Version >= Ada_2005 |
758c442c GD |
3148 | and then Nkind (Specification (N)) = N_Procedure_Specification |
3149 | and then Null_Present (Specification (N)) | |
3150 | then | |
3151 | Error_Msg_N | |
3152 | ("null procedure cannot be declared at library level", N); | |
3153 | end if; | |
996ae0b0 RK |
3154 | end if; |
3155 | ||
fbf5a39b | 3156 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 3157 | Check_Eliminated (Designator); |
fbf5a39b | 3158 | |
b1b543d2 BD |
3159 | if Debug_Flag_C then |
3160 | Outdent; | |
3161 | Write_Str ("<== subprogram spec "); | |
3162 | Write_Name (Chars (Designator)); | |
3163 | Write_Str (" from "); | |
3164 | Write_Location (Sloc (N)); | |
3165 | Write_Eol; | |
3166 | end if; | |
0f1a6a0b | 3167 | |
1a265e78 AC |
3168 | if Is_Protected_Type (Current_Scope) then |
3169 | ||
3170 | -- Indicate that this is a protected operation, because it may be | |
3171 | -- used in subsequent declarations within the protected type. | |
3172 | ||
3173 | Set_Convention (Designator, Convention_Protected); | |
3174 | end if; | |
3175 | ||
beacce02 | 3176 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
3177 | |
3178 | if Has_Aspects (N) then | |
3179 | Analyze_Aspect_Specifications (N, Designator); | |
3180 | end if; | |
996ae0b0 RK |
3181 | end Analyze_Subprogram_Declaration; |
3182 | ||
fbf5a39b AC |
3183 | -------------------------------------- |
3184 | -- Analyze_Subprogram_Specification -- | |
3185 | -------------------------------------- | |
3186 | ||
3187 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
3188 | -- declaration). This procedure is called to analyze the specification in | |
3189 | -- both subprogram bodies and subprogram declarations (specs). | |
3190 | ||
3191 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
3192 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 3193 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 3194 | |
758c442c GD |
3195 | -- Start of processing for Analyze_Subprogram_Specification |
3196 | ||
fbf5a39b | 3197 | begin |
2ba431e5 | 3198 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 3199 | |
db72f10a AC |
3200 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
3201 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
3202 | then | |
2ba431e5 | 3203 | Check_SPARK_Restriction ("user-defined operator is not allowed", N); |
38171f43 AC |
3204 | end if; |
3205 | ||
3206 | -- Proceed with analysis | |
3207 | ||
fbf5a39b | 3208 | Generate_Definition (Designator); |
dac3bede | 3209 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
fbf5a39b AC |
3210 | |
3211 | if Nkind (N) = N_Function_Specification then | |
3212 | Set_Ekind (Designator, E_Function); | |
3213 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
3214 | else |
3215 | Set_Ekind (Designator, E_Procedure); | |
3216 | Set_Etype (Designator, Standard_Void_Type); | |
3217 | end if; | |
3218 | ||
800621e0 | 3219 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
3220 | |
3221 | Set_Scope (Designator, Current_Scope); | |
3222 | ||
fbf5a39b | 3223 | if Present (Formals) then |
0a36105d | 3224 | Push_Scope (Designator); |
fbf5a39b | 3225 | Process_Formals (Formals, N); |
758c442c | 3226 | |
a38ff9b1 ES |
3227 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
3228 | -- inherited interface operation, and the controlling type is | |
3229 | -- a synchronized type, replace the type with its corresponding | |
3230 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
3231 | -- Same processing for an access parameter whose designated type is |
3232 | -- derived from a synchronized interface. | |
758c442c | 3233 | |
0791fbe9 | 3234 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
3235 | declare |
3236 | Formal : Entity_Id; | |
3237 | Formal_Typ : Entity_Id; | |
3238 | Rec_Typ : Entity_Id; | |
69cb258c | 3239 | Desig_Typ : Entity_Id; |
0a36105d | 3240 | |
d44202ba HK |
3241 | begin |
3242 | Formal := First_Formal (Designator); | |
3243 | while Present (Formal) loop | |
3244 | Formal_Typ := Etype (Formal); | |
0a36105d | 3245 | |
d44202ba HK |
3246 | if Is_Concurrent_Type (Formal_Typ) |
3247 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
3248 | then | |
3249 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
3250 | ||
3251 | if Present (Interfaces (Rec_Typ)) then | |
3252 | Set_Etype (Formal, Rec_Typ); | |
3253 | end if; | |
69cb258c AC |
3254 | |
3255 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
3256 | Desig_Typ := Designated_Type (Formal_Typ); | |
3257 | ||
3258 | if Is_Concurrent_Type (Desig_Typ) | |
3259 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
3260 | then | |
3261 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
3262 | ||
3263 | if Present (Interfaces (Rec_Typ)) then | |
3264 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
3265 | end if; | |
3266 | end if; | |
d44202ba HK |
3267 | end if; |
3268 | ||
3269 | Next_Formal (Formal); | |
3270 | end loop; | |
3271 | end; | |
758c442c GD |
3272 | end if; |
3273 | ||
fbf5a39b | 3274 | End_Scope; |
82c80734 | 3275 | |
b66c3ff4 AC |
3276 | -- The subprogram scope is pushed and popped around the processing of |
3277 | -- the return type for consistency with call above to Process_Formals | |
3278 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
3279 | -- itype created for the return type will be associated with the proper | |
3280 | -- scope. | |
3281 | ||
82c80734 | 3282 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 3283 | Push_Scope (Designator); |
82c80734 | 3284 | Analyze_Return_Type (N); |
b66c3ff4 | 3285 | End_Scope; |
fbf5a39b AC |
3286 | end if; |
3287 | ||
e606088a AC |
3288 | -- Function case |
3289 | ||
fbf5a39b | 3290 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
3291 | |
3292 | -- Deal with operator symbol case | |
3293 | ||
fbf5a39b AC |
3294 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
3295 | Valid_Operator_Definition (Designator); | |
3296 | end if; | |
3297 | ||
3298 | May_Need_Actuals (Designator); | |
3299 | ||
fe63b1b1 ES |
3300 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
3301 | -- the subprogram is abstract also. This does not apply to renaming | |
3302 | -- declarations, where abstractness is inherited. | |
2bfb1b72 | 3303 | |
fe63b1b1 ES |
3304 | -- In case of primitives associated with abstract interface types |
3305 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 3306 | |
2bfb1b72 RD |
3307 | if not Nkind_In (Parent (N), N_Subprogram_Renaming_Declaration, |
3308 | N_Abstract_Subprogram_Declaration, | |
3309 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 3310 | then |
2e79de51 AC |
3311 | if Is_Abstract_Type (Etype (Designator)) |
3312 | and then not Is_Interface (Etype (Designator)) | |
3313 | then | |
3314 | Error_Msg_N | |
3315 | ("function that returns abstract type must be abstract", N); | |
3316 | ||
e606088a | 3317 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
3318 | -- access result whose designated type is abstract. |
3319 | ||
3320 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
3321 | and then | |
3322 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
3323 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 3324 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
3325 | then |
3326 | Error_Msg_N ("function whose access result designates " | |
3327 | & "abstract type must be abstract", N); | |
3328 | end if; | |
fbf5a39b AC |
3329 | end if; |
3330 | end if; | |
3331 | ||
3332 | return Designator; | |
3333 | end Analyze_Subprogram_Specification; | |
3334 | ||
996ae0b0 RK |
3335 | -------------------------- |
3336 | -- Build_Body_To_Inline -- | |
3337 | -------------------------- | |
3338 | ||
d05ef0ab | 3339 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id) is |
f937473f | 3340 | Decl : constant Node_Id := Unit_Declaration_Node (Subp); |
996ae0b0 RK |
3341 | Original_Body : Node_Id; |
3342 | Body_To_Analyze : Node_Id; | |
3343 | Max_Size : constant := 10; | |
3344 | Stat_Count : Integer := 0; | |
3345 | ||
3346 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
e895b435 | 3347 | -- Check for declarations that make inlining not worthwhile |
996ae0b0 RK |
3348 | |
3349 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
82c80734 RD |
3350 | -- Check for statements that make inlining not worthwhile: any tasking |
3351 | -- statement, nested at any level. Keep track of total number of | |
3352 | -- elementary statements, as a measure of acceptable size. | |
996ae0b0 RK |
3353 | |
3354 | function Has_Pending_Instantiation return Boolean; | |
f937473f RD |
3355 | -- If some enclosing body contains instantiations that appear before the |
3356 | -- corresponding generic body, the enclosing body has a freeze node so | |
3357 | -- that it can be elaborated after the generic itself. This might | |
996ae0b0 RK |
3358 | -- conflict with subsequent inlinings, so that it is unsafe to try to |
3359 | -- inline in such a case. | |
3360 | ||
c8ef728f | 3361 | function Has_Single_Return return Boolean; |
f937473f RD |
3362 | -- In general we cannot inline functions that return unconstrained type. |
3363 | -- However, we can handle such functions if all return statements return | |
3364 | -- a local variable that is the only declaration in the body of the | |
3365 | -- function. In that case the call can be replaced by that local | |
3366 | -- variable as is done for other inlined calls. | |
c8ef728f | 3367 | |
fbf5a39b | 3368 | procedure Remove_Pragmas; |
76a69663 ES |
3369 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal |
3370 | -- parameter has no meaning when the body is inlined and the formals | |
3371 | -- are rewritten. Remove it from body to inline. The analysis of the | |
3372 | -- non-inlined body will handle the pragma properly. | |
996ae0b0 | 3373 | |
e895b435 ES |
3374 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean; |
3375 | -- If the body of the subprogram includes a call that returns an | |
3376 | -- unconstrained type, the secondary stack is involved, and it | |
3377 | -- is not worth inlining. | |
3378 | ||
996ae0b0 RK |
3379 | ------------------------------ |
3380 | -- Has_Excluded_Declaration -- | |
3381 | ------------------------------ | |
3382 | ||
3383 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
3384 | D : Node_Id; | |
3385 | ||
fbf5a39b | 3386 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; |
82c80734 RD |
3387 | -- Nested subprograms make a given body ineligible for inlining, but |
3388 | -- we make an exception for instantiations of unchecked conversion. | |
3389 | -- The body has not been analyzed yet, so check the name, and verify | |
3390 | -- that the visible entity with that name is the predefined unit. | |
3391 | ||
3392 | ----------------------------- | |
3393 | -- Is_Unchecked_Conversion -- | |
3394 | ----------------------------- | |
fbf5a39b AC |
3395 | |
3396 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
82c80734 | 3397 | Id : constant Node_Id := Name (D); |
fbf5a39b AC |
3398 | Conv : Entity_Id; |
3399 | ||
3400 | begin | |
3401 | if Nkind (Id) = N_Identifier | |
3402 | and then Chars (Id) = Name_Unchecked_Conversion | |
3403 | then | |
3404 | Conv := Current_Entity (Id); | |
3405 | ||
800621e0 | 3406 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) |
fbf5a39b AC |
3407 | and then Chars (Selector_Name (Id)) = Name_Unchecked_Conversion |
3408 | then | |
3409 | Conv := Current_Entity (Selector_Name (Id)); | |
fbf5a39b AC |
3410 | else |
3411 | return False; | |
3412 | end if; | |
3413 | ||
758c442c GD |
3414 | return Present (Conv) |
3415 | and then Is_Predefined_File_Name | |
3416 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
fbf5a39b AC |
3417 | and then Is_Intrinsic_Subprogram (Conv); |
3418 | end Is_Unchecked_Conversion; | |
3419 | ||
3420 | -- Start of processing for Has_Excluded_Declaration | |
3421 | ||
996ae0b0 RK |
3422 | begin |
3423 | D := First (Decls); | |
996ae0b0 | 3424 | while Present (D) loop |
800621e0 RD |
3425 | if (Nkind (D) = N_Function_Instantiation |
3426 | and then not Is_Unchecked_Conversion (D)) | |
3427 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
3428 | N_Package_Declaration, | |
3429 | N_Package_Instantiation, | |
3430 | N_Subprogram_Body, | |
3431 | N_Procedure_Instantiation, | |
3432 | N_Task_Type_Declaration) | |
996ae0b0 RK |
3433 | then |
3434 | Cannot_Inline | |
fbf5a39b | 3435 | ("cannot inline & (non-allowed declaration)?", D, Subp); |
996ae0b0 RK |
3436 | return True; |
3437 | end if; | |
3438 | ||
3439 | Next (D); | |
3440 | end loop; | |
3441 | ||
3442 | return False; | |
996ae0b0 RK |
3443 | end Has_Excluded_Declaration; |
3444 | ||
3445 | ---------------------------- | |
3446 | -- Has_Excluded_Statement -- | |
3447 | ---------------------------- | |
3448 | ||
3449 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
3450 | S : Node_Id; | |
3451 | E : Node_Id; | |
3452 | ||
3453 | begin | |
3454 | S := First (Stats); | |
996ae0b0 RK |
3455 | while Present (S) loop |
3456 | Stat_Count := Stat_Count + 1; | |
3457 | ||
800621e0 RD |
3458 | if Nkind_In (S, N_Abort_Statement, |
3459 | N_Asynchronous_Select, | |
3460 | N_Conditional_Entry_Call, | |
3461 | N_Delay_Relative_Statement, | |
3462 | N_Delay_Until_Statement, | |
3463 | N_Selective_Accept, | |
3464 | N_Timed_Entry_Call) | |
996ae0b0 RK |
3465 | then |
3466 | Cannot_Inline | |
fbf5a39b | 3467 | ("cannot inline & (non-allowed statement)?", S, Subp); |
996ae0b0 RK |
3468 | return True; |
3469 | ||
3470 | elsif Nkind (S) = N_Block_Statement then | |
3471 | if Present (Declarations (S)) | |
3472 | and then Has_Excluded_Declaration (Declarations (S)) | |
3473 | then | |
3474 | return True; | |
3475 | ||
3476 | elsif Present (Handled_Statement_Sequence (S)) | |
3477 | and then | |
3478 | (Present | |
3479 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
3480 | or else | |
3481 | Has_Excluded_Statement | |
3482 | (Statements (Handled_Statement_Sequence (S)))) | |
3483 | then | |
3484 | return True; | |
3485 | end if; | |
3486 | ||
3487 | elsif Nkind (S) = N_Case_Statement then | |
3488 | E := First (Alternatives (S)); | |
996ae0b0 RK |
3489 | while Present (E) loop |
3490 | if Has_Excluded_Statement (Statements (E)) then | |
3491 | return True; | |
3492 | end if; | |
3493 | ||
3494 | Next (E); | |
3495 | end loop; | |
3496 | ||
3497 | elsif Nkind (S) = N_If_Statement then | |
3498 | if Has_Excluded_Statement (Then_Statements (S)) then | |
3499 | return True; | |
3500 | end if; | |
3501 | ||
3502 | if Present (Elsif_Parts (S)) then | |
3503 | E := First (Elsif_Parts (S)); | |
996ae0b0 RK |
3504 | while Present (E) loop |
3505 | if Has_Excluded_Statement (Then_Statements (E)) then | |
3506 | return True; | |
3507 | end if; | |
3508 | Next (E); | |
3509 | end loop; | |
3510 | end if; | |
3511 | ||
3512 | if Present (Else_Statements (S)) | |
3513 | and then Has_Excluded_Statement (Else_Statements (S)) | |
3514 | then | |
3515 | return True; | |
3516 | end if; | |
3517 | ||
3518 | elsif Nkind (S) = N_Loop_Statement | |
3519 | and then Has_Excluded_Statement (Statements (S)) | |
3520 | then | |
3521 | return True; | |
3e2399ba AC |
3522 | |
3523 | elsif Nkind (S) = N_Extended_Return_Statement then | |
3524 | if Has_Excluded_Statement | |
3525 | (Statements (Handled_Statement_Sequence (S))) | |
3526 | or else Present | |
3527 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
3528 | then | |
3529 | return True; | |
3530 | end if; | |
996ae0b0 RK |
3531 | end if; |
3532 | ||
3533 | Next (S); | |
3534 | end loop; | |
3535 | ||
3536 | return False; | |
3537 | end Has_Excluded_Statement; | |
3538 | ||
3539 | ------------------------------- | |
3540 | -- Has_Pending_Instantiation -- | |
3541 | ------------------------------- | |
3542 | ||
3543 | function Has_Pending_Instantiation return Boolean is | |
ec4867fa | 3544 | S : Entity_Id; |
996ae0b0 RK |
3545 | |
3546 | begin | |
ec4867fa | 3547 | S := Current_Scope; |
996ae0b0 RK |
3548 | while Present (S) loop |
3549 | if Is_Compilation_Unit (S) | |
3550 | or else Is_Child_Unit (S) | |
3551 | then | |
3552 | return False; | |
bce79204 | 3553 | |
996ae0b0 RK |
3554 | elsif Ekind (S) = E_Package |
3555 | and then Has_Forward_Instantiation (S) | |
3556 | then | |
3557 | return True; | |
3558 | end if; | |
3559 | ||
3560 | S := Scope (S); | |
3561 | end loop; | |
3562 | ||
3563 | return False; | |
3564 | end Has_Pending_Instantiation; | |
3565 | ||
c8ef728f ES |
3566 | ------------------------ |
3567 | -- Has_Single_Return -- | |
3568 | ------------------------ | |
3569 | ||
3570 | function Has_Single_Return return Boolean is | |
3571 | Return_Statement : Node_Id := Empty; | |
3572 | ||
3573 | function Check_Return (N : Node_Id) return Traverse_Result; | |
3574 | ||
3575 | ------------------ | |
3576 | -- Check_Return -- | |
3577 | ------------------ | |
3578 | ||
3579 | function Check_Return (N : Node_Id) return Traverse_Result is | |
3580 | begin | |
5d37ba92 | 3581 | if Nkind (N) = N_Simple_Return_Statement then |
c8ef728f ES |
3582 | if Present (Expression (N)) |
3583 | and then Is_Entity_Name (Expression (N)) | |
3584 | then | |
3585 | if No (Return_Statement) then | |
3586 | Return_Statement := N; | |
3587 | return OK; | |
3588 | ||
3589 | elsif Chars (Expression (N)) = | |
3590 | Chars (Expression (Return_Statement)) | |
3591 | then | |
3592 | return OK; | |
3593 | ||
3594 | else | |
3595 | return Abandon; | |
3596 | end if; | |
3597 | ||
3e2399ba AC |
3598 | -- A return statement within an extended return is a noop |
3599 | -- after inlining. | |
3600 | ||
3601 | elsif No (Expression (N)) | |
3602 | and then Nkind (Parent (Parent (N))) = | |
3603 | N_Extended_Return_Statement | |
3604 | then | |
3605 | return OK; | |
3606 | ||
c8ef728f ES |
3607 | else |
3608 | -- Expression has wrong form | |
3609 | ||
3610 | return Abandon; | |
3611 | end if; | |
3612 | ||
3e2399ba AC |
3613 | -- We can only inline a build-in-place function if |
3614 | -- it has a single extended return. | |
3615 | ||
3616 | elsif Nkind (N) = N_Extended_Return_Statement then | |
3617 | if No (Return_Statement) then | |
3618 | Return_Statement := N; | |
3619 | return OK; | |
3620 | ||
3621 | else | |
3622 | return Abandon; | |
3623 | end if; | |
3624 | ||
c8ef728f ES |
3625 | else |
3626 | return OK; | |
3627 | end if; | |
3628 | end Check_Return; | |
3629 | ||
3630 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
3631 | ||
3632 | -- Start of processing for Has_Single_Return | |
3633 | ||
3634 | begin | |
3e2399ba AC |
3635 | if Check_All_Returns (N) /= OK then |
3636 | return False; | |
3637 | ||
3638 | elsif Nkind (Return_Statement) = N_Extended_Return_Statement then | |
3639 | return True; | |
3640 | ||
3641 | else | |
3642 | return Present (Declarations (N)) | |
3643 | and then Present (First (Declarations (N))) | |
3644 | and then Chars (Expression (Return_Statement)) = | |
3645 | Chars (Defining_Identifier (First (Declarations (N)))); | |
3646 | end if; | |
c8ef728f ES |
3647 | end Has_Single_Return; |
3648 | ||
fbf5a39b AC |
3649 | -------------------- |
3650 | -- Remove_Pragmas -- | |
3651 | -------------------- | |
3652 | ||
3653 | procedure Remove_Pragmas is | |
3654 | Decl : Node_Id; | |
3655 | Nxt : Node_Id; | |
3656 | ||
3657 | begin | |
3658 | Decl := First (Declarations (Body_To_Analyze)); | |
3659 | while Present (Decl) loop | |
3660 | Nxt := Next (Decl); | |
3661 | ||
3662 | if Nkind (Decl) = N_Pragma | |
76a69663 ES |
3663 | and then (Pragma_Name (Decl) = Name_Unreferenced |
3664 | or else | |
3665 | Pragma_Name (Decl) = Name_Unmodified) | |
fbf5a39b AC |
3666 | then |
3667 | Remove (Decl); | |
3668 | end if; | |
3669 | ||
3670 | Decl := Nxt; | |
3671 | end loop; | |
3672 | end Remove_Pragmas; | |
3673 | ||
e895b435 ES |
3674 | -------------------------- |
3675 | -- Uses_Secondary_Stack -- | |
3676 | -------------------------- | |
3677 | ||
3678 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean is | |
3679 | function Check_Call (N : Node_Id) return Traverse_Result; | |
3680 | -- Look for function calls that return an unconstrained type | |
3681 | ||
3682 | ---------------- | |
3683 | -- Check_Call -- | |
3684 | ---------------- | |
3685 | ||
3686 | function Check_Call (N : Node_Id) return Traverse_Result is | |
3687 | begin | |
3688 | if Nkind (N) = N_Function_Call | |
3689 | and then Is_Entity_Name (Name (N)) | |
3690 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
3691 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
3692 | then | |
3693 | Cannot_Inline | |
3694 | ("cannot inline & (call returns unconstrained type)?", | |
3695 | N, Subp); | |
3696 | return Abandon; | |
3697 | else | |
3698 | return OK; | |
3699 | end if; | |
3700 | end Check_Call; | |
3701 | ||
3702 | function Check_Calls is new Traverse_Func (Check_Call); | |
3703 | ||
3704 | begin | |
3705 | return Check_Calls (Bod) = Abandon; | |
3706 | end Uses_Secondary_Stack; | |
3707 | ||
996ae0b0 RK |
3708 | -- Start of processing for Build_Body_To_Inline |
3709 | ||
3710 | begin | |
8dbd1460 AC |
3711 | -- Return immediately if done already |
3712 | ||
996ae0b0 RK |
3713 | if Nkind (Decl) = N_Subprogram_Declaration |
3714 | and then Present (Body_To_Inline (Decl)) | |
3715 | then | |
8dbd1460 | 3716 | return; |
996ae0b0 | 3717 | |
08402a6d ES |
3718 | -- Functions that return unconstrained composite types require |
3719 | -- secondary stack handling, and cannot currently be inlined, unless | |
3720 | -- all return statements return a local variable that is the first | |
3721 | -- local declaration in the body. | |
996ae0b0 RK |
3722 | |
3723 | elsif Ekind (Subp) = E_Function | |
3724 | and then not Is_Scalar_Type (Etype (Subp)) | |
3725 | and then not Is_Access_Type (Etype (Subp)) | |
3726 | and then not Is_Constrained (Etype (Subp)) | |
3727 | then | |
08402a6d ES |
3728 | if not Has_Single_Return then |
3729 | Cannot_Inline | |
3730 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
3731 | return; | |
3732 | end if; | |
3733 | ||
3734 | -- Ditto for functions that return controlled types, where controlled | |
3735 | -- actions interfere in complex ways with inlining. | |
2820d220 AC |
3736 | |
3737 | elsif Ekind (Subp) = E_Function | |
048e5cef | 3738 | and then Needs_Finalization (Etype (Subp)) |
2820d220 AC |
3739 | then |
3740 | Cannot_Inline | |
3741 | ("cannot inline & (controlled return type)?", N, Subp); | |
3742 | return; | |
996ae0b0 RK |
3743 | end if; |
3744 | ||
d05ef0ab AC |
3745 | if Present (Declarations (N)) |
3746 | and then Has_Excluded_Declaration (Declarations (N)) | |
996ae0b0 | 3747 | then |
d05ef0ab | 3748 | return; |
996ae0b0 RK |
3749 | end if; |
3750 | ||
3751 | if Present (Handled_Statement_Sequence (N)) then | |
fbf5a39b AC |
3752 | if Present (Exception_Handlers (Handled_Statement_Sequence (N))) then |
3753 | Cannot_Inline | |
3754 | ("cannot inline& (exception handler)?", | |
3755 | First (Exception_Handlers (Handled_Statement_Sequence (N))), | |
3756 | Subp); | |
d05ef0ab | 3757 | return; |
996ae0b0 RK |
3758 | elsif |
3759 | Has_Excluded_Statement | |
3760 | (Statements (Handled_Statement_Sequence (N))) | |
3761 | then | |
d05ef0ab | 3762 | return; |
996ae0b0 RK |
3763 | end if; |
3764 | end if; | |
3765 | ||
3766 | -- We do not inline a subprogram that is too large, unless it is | |
3767 | -- marked Inline_Always. This pragma does not suppress the other | |
3768 | -- checks on inlining (forbidden declarations, handlers, etc). | |
3769 | ||
3770 | if Stat_Count > Max_Size | |
800621e0 | 3771 | and then not Has_Pragma_Inline_Always (Subp) |
996ae0b0 | 3772 | then |
fbf5a39b | 3773 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); |
d05ef0ab | 3774 | return; |
996ae0b0 RK |
3775 | end if; |
3776 | ||
3777 | if Has_Pending_Instantiation then | |
3778 | Cannot_Inline | |
fbf5a39b AC |
3779 | ("cannot inline& (forward instance within enclosing body)?", |
3780 | N, Subp); | |
d05ef0ab AC |
3781 | return; |
3782 | end if; | |
3783 | ||
3784 | -- Within an instance, the body to inline must be treated as a nested | |
3785 | -- generic, so that the proper global references are preserved. | |
3786 | ||
ce4e59c4 ST |
3787 | -- Note that we do not do this at the library level, because it is not |
3788 | -- needed, and furthermore this causes trouble if front end inlining | |
3789 | -- is activated (-gnatN). | |
3790 | ||
3791 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
3792 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); |
3793 | Original_Body := Copy_Generic_Node (N, Empty, True); | |
3794 | else | |
3795 | Original_Body := Copy_Separate_Tree (N); | |
996ae0b0 RK |
3796 | end if; |
3797 | ||
d05ef0ab AC |
3798 | -- We need to capture references to the formals in order to substitute |
3799 | -- the actuals at the point of inlining, i.e. instantiation. To treat | |
3800 | -- the formals as globals to the body to inline, we nest it within | |
3801 | -- a dummy parameterless subprogram, declared within the real one. | |
24105bab AC |
3802 | -- To avoid generating an internal name (which is never public, and |
3803 | -- which affects serial numbers of other generated names), we use | |
3804 | -- an internal symbol that cannot conflict with user declarations. | |
d05ef0ab AC |
3805 | |
3806 | Set_Parameter_Specifications (Specification (Original_Body), No_List); | |
24105bab AC |
3807 | Set_Defining_Unit_Name |
3808 | (Specification (Original_Body), | |
3809 | Make_Defining_Identifier (Sloc (N), Name_uParent)); | |
d05ef0ab AC |
3810 | Set_Corresponding_Spec (Original_Body, Empty); |
3811 | ||
996ae0b0 RK |
3812 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); |
3813 | ||
3814 | -- Set return type of function, which is also global and does not need | |
3815 | -- to be resolved. | |
3816 | ||
3817 | if Ekind (Subp) = E_Function then | |
41251c60 | 3818 | Set_Result_Definition (Specification (Body_To_Analyze), |
996ae0b0 RK |
3819 | New_Occurrence_Of (Etype (Subp), Sloc (N))); |
3820 | end if; | |
3821 | ||
3822 | if No (Declarations (N)) then | |
3823 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
3824 | else | |
3825 | Append (Body_To_Analyze, Declarations (N)); | |
3826 | end if; | |
3827 | ||
3828 | Expander_Mode_Save_And_Set (False); | |
fbf5a39b | 3829 | Remove_Pragmas; |
996ae0b0 RK |
3830 | |
3831 | Analyze (Body_To_Analyze); | |
0a36105d | 3832 | Push_Scope (Defining_Entity (Body_To_Analyze)); |
996ae0b0 RK |
3833 | Save_Global_References (Original_Body); |
3834 | End_Scope; | |
3835 | Remove (Body_To_Analyze); | |
3836 | ||
3837 | Expander_Mode_Restore; | |
d05ef0ab | 3838 | |
ce4e59c4 ST |
3839 | -- Restore environment if previously saved |
3840 | ||
3841 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
3842 | Restore_Env; |
3843 | end if; | |
e895b435 ES |
3844 | |
3845 | -- If secondary stk used there is no point in inlining. We have | |
3846 | -- already issued the warning in this case, so nothing to do. | |
3847 | ||
3848 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
3849 | return; | |
3850 | end if; | |
3851 | ||
3852 | Set_Body_To_Inline (Decl, Original_Body); | |
3853 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Subp)); | |
3854 | Set_Is_Inlined (Subp); | |
996ae0b0 RK |
3855 | end Build_Body_To_Inline; |
3856 | ||
fbf5a39b AC |
3857 | ------------------- |
3858 | -- Cannot_Inline -- | |
3859 | ------------------- | |
3860 | ||
3861 | procedure Cannot_Inline (Msg : String; N : Node_Id; Subp : Entity_Id) is | |
3862 | begin | |
676e8420 AC |
3863 | -- Do not emit warning if this is a predefined unit which is not the |
3864 | -- main unit. With validity checks enabled, some predefined subprograms | |
3865 | -- may contain nested subprograms and become ineligible for inlining. | |
fbf5a39b AC |
3866 | |
3867 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
3868 | and then not In_Extended_Main_Source_Unit (Subp) | |
3869 | then | |
3870 | null; | |
3871 | ||
800621e0 | 3872 | elsif Has_Pragma_Inline_Always (Subp) then |
e895b435 ES |
3873 | |
3874 | -- Remove last character (question mark) to make this into an error, | |
3875 | -- because the Inline_Always pragma cannot be obeyed. | |
3876 | ||
ec4867fa | 3877 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); |
fbf5a39b AC |
3878 | |
3879 | elsif Ineffective_Inline_Warnings then | |
3880 | Error_Msg_NE (Msg, N, Subp); | |
3881 | end if; | |
3882 | end Cannot_Inline; | |
3883 | ||
996ae0b0 RK |
3884 | ----------------------- |
3885 | -- Check_Conformance -- | |
3886 | ----------------------- | |
3887 | ||
3888 | procedure Check_Conformance | |
41251c60 JM |
3889 | (New_Id : Entity_Id; |
3890 | Old_Id : Entity_Id; | |
3891 | Ctype : Conformance_Type; | |
3892 | Errmsg : Boolean; | |
3893 | Conforms : out Boolean; | |
3894 | Err_Loc : Node_Id := Empty; | |
3895 | Get_Inst : Boolean := False; | |
3896 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 3897 | is |
996ae0b0 | 3898 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
3899 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
3900 | -- If Errmsg is True, then processing continues to post an error message | |
3901 | -- for conformance error on given node. Two messages are output. The | |
3902 | -- first message points to the previous declaration with a general "no | |
3903 | -- conformance" message. The second is the detailed reason, supplied as | |
3904 | -- Msg. The parameter N provide information for a possible & insertion | |
3905 | -- in the message, and also provides the location for posting the | |
3906 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
3907 | |
3908 | ----------------------- | |
3909 | -- Conformance_Error -- | |
3910 | ----------------------- | |
3911 | ||
3912 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
3913 | Enode : Node_Id; | |
3914 | ||
3915 | begin | |
3916 | Conforms := False; | |
3917 | ||
3918 | if Errmsg then | |
3919 | if No (Err_Loc) then | |
3920 | Enode := N; | |
3921 | else | |
3922 | Enode := Err_Loc; | |
3923 | end if; | |
3924 | ||
3925 | Error_Msg_Sloc := Sloc (Old_Id); | |
3926 | ||
3927 | case Ctype is | |
3928 | when Type_Conformant => | |
483c78cb | 3929 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
3930 | ("not type conformant with declaration#!", Enode); |
3931 | ||
3932 | when Mode_Conformant => | |
19590d70 | 3933 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 3934 | Error_Msg_N |
19590d70 GD |
3935 | ("not mode conformant with operation inherited#!", |
3936 | Enode); | |
3937 | else | |
ed2233dc | 3938 | Error_Msg_N |
19590d70 GD |
3939 | ("not mode conformant with declaration#!", Enode); |
3940 | end if; | |
996ae0b0 RK |
3941 | |
3942 | when Subtype_Conformant => | |
19590d70 | 3943 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 3944 | Error_Msg_N |
19590d70 GD |
3945 | ("not subtype conformant with operation inherited#!", |
3946 | Enode); | |
3947 | else | |
ed2233dc | 3948 | Error_Msg_N |
19590d70 GD |
3949 | ("not subtype conformant with declaration#!", Enode); |
3950 | end if; | |
996ae0b0 RK |
3951 | |
3952 | when Fully_Conformant => | |
19590d70 | 3953 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 3954 | Error_Msg_N -- CODEFIX |
19590d70 GD |
3955 | ("not fully conformant with operation inherited#!", |
3956 | Enode); | |
3957 | else | |
483c78cb | 3958 | Error_Msg_N -- CODEFIX |
19590d70 GD |
3959 | ("not fully conformant with declaration#!", Enode); |
3960 | end if; | |
996ae0b0 RK |
3961 | end case; |
3962 | ||
3963 | Error_Msg_NE (Msg, Enode, N); | |
3964 | end if; | |
3965 | end Conformance_Error; | |
3966 | ||
ec4867fa ES |
3967 | -- Local Variables |
3968 | ||
3969 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
3970 | New_Type : constant Entity_Id := Etype (New_Id); | |
3971 | Old_Formal : Entity_Id; | |
3972 | New_Formal : Entity_Id; | |
3973 | Access_Types_Match : Boolean; | |
3974 | Old_Formal_Base : Entity_Id; | |
3975 | New_Formal_Base : Entity_Id; | |
3976 | ||
996ae0b0 RK |
3977 | -- Start of processing for Check_Conformance |
3978 | ||
3979 | begin | |
3980 | Conforms := True; | |
3981 | ||
82c80734 RD |
3982 | -- We need a special case for operators, since they don't appear |
3983 | -- explicitly. | |
996ae0b0 RK |
3984 | |
3985 | if Ctype = Type_Conformant then | |
3986 | if Ekind (New_Id) = E_Operator | |
3987 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
3988 | then | |
3989 | return; | |
3990 | end if; | |
3991 | end if; | |
3992 | ||
3993 | -- If both are functions/operators, check return types conform | |
3994 | ||
3995 | if Old_Type /= Standard_Void_Type | |
3996 | and then New_Type /= Standard_Void_Type | |
3997 | then | |
fceeaab6 ES |
3998 | |
3999 | -- If we are checking interface conformance we omit controlling | |
4000 | -- arguments and result, because we are only checking the conformance | |
4001 | -- of the remaining parameters. | |
4002 | ||
4003 | if Has_Controlling_Result (Old_Id) | |
4004 | and then Has_Controlling_Result (New_Id) | |
4005 | and then Skip_Controlling_Formals | |
4006 | then | |
4007 | null; | |
4008 | ||
4009 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
5d37ba92 | 4010 | Conformance_Error ("\return type does not match!", New_Id); |
996ae0b0 RK |
4011 | return; |
4012 | end if; | |
4013 | ||
41251c60 | 4014 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 4015 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 4016 | |
0791fbe9 | 4017 | if Ada_Version >= Ada_2005 |
41251c60 JM |
4018 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
4019 | and then | |
4020 | (Can_Never_Be_Null (Old_Type) | |
4021 | /= Can_Never_Be_Null (New_Type) | |
4022 | or else Is_Access_Constant (Etype (Old_Type)) | |
4023 | /= Is_Access_Constant (Etype (New_Type))) | |
4024 | then | |
5d37ba92 | 4025 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
4026 | return; |
4027 | end if; | |
4028 | ||
996ae0b0 RK |
4029 | -- If either is a function/operator and the other isn't, error |
4030 | ||
4031 | elsif Old_Type /= Standard_Void_Type | |
4032 | or else New_Type /= Standard_Void_Type | |
4033 | then | |
5d37ba92 | 4034 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
4035 | return; |
4036 | end if; | |
4037 | ||
0a36105d | 4038 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
4039 | -- If this is a renaming as body, refine error message to indicate that |
4040 | -- the conflict is with the original declaration. If the entity is not | |
4041 | -- frozen, the conventions don't have to match, the one of the renamed | |
4042 | -- entity is inherited. | |
4043 | ||
4044 | if Ctype >= Subtype_Conformant then | |
996ae0b0 RK |
4045 | if Convention (Old_Id) /= Convention (New_Id) then |
4046 | ||
4047 | if not Is_Frozen (New_Id) then | |
4048 | null; | |
4049 | ||
4050 | elsif Present (Err_Loc) | |
4051 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
4052 | and then Present (Corresponding_Spec (Err_Loc)) | |
4053 | then | |
4054 | Error_Msg_Name_1 := Chars (New_Id); | |
4055 | Error_Msg_Name_2 := | |
4056 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 4057 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
4058 | |
4059 | else | |
5d37ba92 | 4060 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
4061 | end if; |
4062 | ||
4063 | return; | |
4064 | ||
4065 | elsif Is_Formal_Subprogram (Old_Id) | |
4066 | or else Is_Formal_Subprogram (New_Id) | |
4067 | then | |
5d37ba92 | 4068 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 RK |
4069 | return; |
4070 | end if; | |
4071 | end if; | |
4072 | ||
4073 | -- Deal with parameters | |
4074 | ||
4075 | -- Note: we use the entity information, rather than going directly | |
4076 | -- to the specification in the tree. This is not only simpler, but | |
4077 | -- absolutely necessary for some cases of conformance tests between | |
4078 | -- operators, where the declaration tree simply does not exist! | |
4079 | ||
4080 | Old_Formal := First_Formal (Old_Id); | |
4081 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 4082 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
4083 | if Is_Controlling_Formal (Old_Formal) |
4084 | and then Is_Controlling_Formal (New_Formal) | |
4085 | and then Skip_Controlling_Formals | |
4086 | then | |
a2dc5812 AC |
4087 | -- The controlling formals will have different types when |
4088 | -- comparing an interface operation with its match, but both | |
4089 | -- or neither must be access parameters. | |
4090 | ||
4091 | if Is_Access_Type (Etype (Old_Formal)) | |
4092 | = | |
4093 | Is_Access_Type (Etype (New_Formal)) | |
4094 | then | |
4095 | goto Skip_Controlling_Formal; | |
4096 | else | |
4097 | Conformance_Error | |
4098 | ("\access parameter does not match!", New_Formal); | |
4099 | end if; | |
41251c60 JM |
4100 | end if; |
4101 | ||
fbf5a39b AC |
4102 | if Ctype = Fully_Conformant then |
4103 | ||
4104 | -- Names must match. Error message is more accurate if we do | |
4105 | -- this before checking that the types of the formals match. | |
4106 | ||
4107 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
5d37ba92 | 4108 | Conformance_Error ("\name & does not match!", New_Formal); |
fbf5a39b AC |
4109 | |
4110 | -- Set error posted flag on new formal as well to stop | |
4111 | -- junk cascaded messages in some cases. | |
4112 | ||
4113 | Set_Error_Posted (New_Formal); | |
4114 | return; | |
4115 | end if; | |
40b93859 RD |
4116 | |
4117 | -- Null exclusion must match | |
4118 | ||
4119 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
4120 | /= | |
4121 | Null_Exclusion_Present (Parent (New_Formal)) | |
4122 | then | |
4123 | -- Only give error if both come from source. This should be | |
4124 | -- investigated some time, since it should not be needed ??? | |
4125 | ||
4126 | if Comes_From_Source (Old_Formal) | |
4127 | and then | |
4128 | Comes_From_Source (New_Formal) | |
4129 | then | |
4130 | Conformance_Error | |
4131 | ("\null exclusion for & does not match", New_Formal); | |
4132 | ||
4133 | -- Mark error posted on the new formal to avoid duplicated | |
4134 | -- complaint about types not matching. | |
4135 | ||
4136 | Set_Error_Posted (New_Formal); | |
4137 | end if; | |
4138 | end if; | |
fbf5a39b | 4139 | end if; |
996ae0b0 | 4140 | |
ec4867fa ES |
4141 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
4142 | -- case occurs whenever a subprogram is being renamed and one of its | |
4143 | -- parameters imposes a null exclusion. For example: | |
4144 | ||
4145 | -- type T is null record; | |
4146 | -- type Acc_T is access T; | |
4147 | -- subtype Acc_T_Sub is Acc_T; | |
4148 | ||
4149 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
4150 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
4151 | -- renames P; | |
4152 | ||
4153 | Old_Formal_Base := Etype (Old_Formal); | |
4154 | New_Formal_Base := Etype (New_Formal); | |
4155 | ||
4156 | if Get_Inst then | |
4157 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
4158 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
4159 | end if; | |
4160 | ||
0791fbe9 | 4161 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa ES |
4162 | |
4163 | -- Ensure that this rule is only applied when New_Id is a | |
5d37ba92 | 4164 | -- renaming of Old_Id. |
ec4867fa | 4165 | |
5d37ba92 ES |
4166 | and then Nkind (Parent (Parent (New_Id))) = |
4167 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
4168 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
4169 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
4170 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
4171 | ||
4172 | -- Now handle the allowed access-type case | |
4173 | ||
4174 | and then Is_Access_Type (Old_Formal_Base) | |
4175 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 ES |
4176 | |
4177 | -- The type kinds must match. The only exception occurs with | |
4178 | -- multiple generics of the form: | |
4179 | ||
4180 | -- generic generic | |
4181 | -- type F is private; type A is private; | |
4182 | -- type F_Ptr is access F; type A_Ptr is access A; | |
4183 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
4184 | -- package F_Pack is ... package A_Pack is | |
4185 | -- package F_Inst is | |
4186 | -- new F_Pack (A, A_Ptr, A_P); | |
4187 | ||
4188 | -- When checking for conformance between the parameters of A_P | |
4189 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
4190 | -- because the compiler has transformed A_Ptr into a subtype of | |
4191 | -- F_Ptr. We catch this case in the code below. | |
4192 | ||
4193 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4194 | or else | |
4195 | (Is_Generic_Type (Old_Formal_Base) | |
4196 | and then Is_Generic_Type (New_Formal_Base) | |
4197 | and then Is_Internal (New_Formal_Base) | |
4198 | and then Etype (Etype (New_Formal_Base)) = | |
4199 | Old_Formal_Base)) | |
ec4867fa ES |
4200 | and then Directly_Designated_Type (Old_Formal_Base) = |
4201 | Directly_Designated_Type (New_Formal_Base) | |
4202 | and then ((Is_Itype (Old_Formal_Base) | |
4203 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
4204 | or else | |
4205 | (Is_Itype (New_Formal_Base) | |
4206 | and then Can_Never_Be_Null (New_Formal_Base))); | |
4207 | ||
996ae0b0 RK |
4208 | -- Types must always match. In the visible part of an instance, |
4209 | -- usual overloading rules for dispatching operations apply, and | |
4210 | -- we check base types (not the actual subtypes). | |
4211 | ||
4212 | if In_Instance_Visible_Part | |
4213 | and then Is_Dispatching_Operation (New_Id) | |
4214 | then | |
4215 | if not Conforming_Types | |
ec4867fa ES |
4216 | (T1 => Base_Type (Etype (Old_Formal)), |
4217 | T2 => Base_Type (Etype (New_Formal)), | |
4218 | Ctype => Ctype, | |
4219 | Get_Inst => Get_Inst) | |
4220 | and then not Access_Types_Match | |
996ae0b0 | 4221 | then |
5d37ba92 | 4222 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
4223 | return; |
4224 | end if; | |
4225 | ||
4226 | elsif not Conforming_Types | |
5d37ba92 ES |
4227 | (T1 => Old_Formal_Base, |
4228 | T2 => New_Formal_Base, | |
ec4867fa ES |
4229 | Ctype => Ctype, |
4230 | Get_Inst => Get_Inst) | |
4231 | and then not Access_Types_Match | |
996ae0b0 | 4232 | then |
c27f2f15 RD |
4233 | -- Don't give error message if old type is Any_Type. This test |
4234 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
4235 | ||
4236 | if Errmsg and then Old_Formal_Base = Any_Type then | |
4237 | Conforms := False; | |
4238 | else | |
4239 | Conformance_Error ("\type of & does not match!", New_Formal); | |
4240 | end if; | |
4241 | ||
996ae0b0 RK |
4242 | return; |
4243 | end if; | |
4244 | ||
4245 | -- For mode conformance, mode must match | |
4246 | ||
5d37ba92 ES |
4247 | if Ctype >= Mode_Conformant then |
4248 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
4249 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
4250 | or else not Is_Primitive_Wrapper (New_Id) | |
4251 | then | |
4252 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 4253 | |
dd54644b JM |
4254 | else |
4255 | declare | |
c199ccf7 | 4256 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b JM |
4257 | begin |
4258 | if Is_Protected_Type | |
4259 | (Corresponding_Concurrent_Type (T)) | |
4260 | then | |
4261 | Error_Msg_PT (T, New_Id); | |
4262 | else | |
4263 | Conformance_Error | |
4264 | ("\mode of & does not match!", New_Formal); | |
4265 | end if; | |
4266 | end; | |
4267 | end if; | |
4268 | ||
5d37ba92 ES |
4269 | return; |
4270 | ||
4271 | -- Part of mode conformance for access types is having the same | |
4272 | -- constant modifier. | |
4273 | ||
4274 | elsif Access_Types_Match | |
4275 | and then Is_Access_Constant (Old_Formal_Base) /= | |
4276 | Is_Access_Constant (New_Formal_Base) | |
4277 | then | |
4278 | Conformance_Error | |
4279 | ("\constant modifier does not match!", New_Formal); | |
4280 | return; | |
4281 | end if; | |
996ae0b0 RK |
4282 | end if; |
4283 | ||
0a36105d | 4284 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 4285 | |
0a36105d JM |
4286 | -- Ada 2005 (AI-231): In case of anonymous access types check |
4287 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
4288 | -- match. For null exclusion, we test the types rather than the |
4289 | -- formals themselves, since the attribute is only set reliably | |
4290 | -- on the formals in the Ada 95 case, and we exclude the case | |
4291 | -- where Old_Formal is marked as controlling, to avoid errors | |
4292 | -- when matching completing bodies with dispatching declarations | |
4293 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 4294 | |
0791fbe9 | 4295 | if Ada_Version >= Ada_2005 |
0a36105d JM |
4296 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
4297 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
4298 | and then | |
c7b9d548 AC |
4299 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
4300 | Can_Never_Be_Null (Etype (New_Formal)) | |
4301 | and then | |
4302 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
4303 | or else |
4304 | Is_Access_Constant (Etype (Old_Formal)) /= | |
4305 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
4306 | |
4307 | -- Do not complain if error already posted on New_Formal. This | |
4308 | -- avoids some redundant error messages. | |
4309 | ||
4310 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
4311 | then |
4312 | -- It is allowed to omit the null-exclusion in case of stream | |
4313 | -- attribute subprograms. We recognize stream subprograms | |
4314 | -- through their TSS-generated suffix. | |
996ae0b0 | 4315 | |
0a36105d JM |
4316 | declare |
4317 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
4318 | begin | |
4319 | if TSS_Name /= TSS_Stream_Read | |
4320 | and then TSS_Name /= TSS_Stream_Write | |
4321 | and then TSS_Name /= TSS_Stream_Input | |
4322 | and then TSS_Name /= TSS_Stream_Output | |
4323 | then | |
4324 | Conformance_Error | |
5d37ba92 | 4325 | ("\type of & does not match!", New_Formal); |
0a36105d JM |
4326 | return; |
4327 | end if; | |
4328 | end; | |
4329 | end if; | |
4330 | end if; | |
41251c60 | 4331 | |
0a36105d | 4332 | -- Full conformance checks |
41251c60 | 4333 | |
0a36105d | 4334 | if Ctype = Fully_Conformant then |
e660dbf7 | 4335 | |
0a36105d | 4336 | -- We have checked already that names match |
e660dbf7 | 4337 | |
0a36105d | 4338 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
4339 | |
4340 | -- Check default expressions for in parameters | |
4341 | ||
996ae0b0 RK |
4342 | declare |
4343 | NewD : constant Boolean := | |
4344 | Present (Default_Value (New_Formal)); | |
4345 | OldD : constant Boolean := | |
4346 | Present (Default_Value (Old_Formal)); | |
4347 | begin | |
4348 | if NewD or OldD then | |
4349 | ||
82c80734 RD |
4350 | -- The old default value has been analyzed because the |
4351 | -- current full declaration will have frozen everything | |
0a36105d JM |
4352 | -- before. The new default value has not been analyzed, |
4353 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
4354 | |
4355 | if NewD then | |
0a36105d | 4356 | Push_Scope (New_Id); |
21d27997 | 4357 | Preanalyze_Spec_Expression |
fbf5a39b | 4358 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
4359 | End_Scope; |
4360 | end if; | |
4361 | ||
4362 | if not (NewD and OldD) | |
4363 | or else not Fully_Conformant_Expressions | |
4364 | (Default_Value (Old_Formal), | |
4365 | Default_Value (New_Formal)) | |
4366 | then | |
4367 | Conformance_Error | |
5d37ba92 | 4368 | ("\default expression for & does not match!", |
996ae0b0 RK |
4369 | New_Formal); |
4370 | return; | |
4371 | end if; | |
4372 | end if; | |
4373 | end; | |
4374 | end if; | |
4375 | end if; | |
4376 | ||
4377 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 4378 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
4379 | -- or if either old or new instance is not from the source program. |
4380 | ||
0ab80019 | 4381 | if Ada_Version = Ada_83 |
996ae0b0 RK |
4382 | and then Sloc (Old_Id) > Standard_Location |
4383 | and then Sloc (New_Id) > Standard_Location | |
4384 | and then Comes_From_Source (Old_Id) | |
4385 | and then Comes_From_Source (New_Id) | |
4386 | then | |
4387 | declare | |
4388 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
4389 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
4390 | ||
4391 | begin | |
4392 | -- Explicit IN must be present or absent in both cases. This | |
4393 | -- test is required only in the full conformance case. | |
4394 | ||
4395 | if In_Present (Old_Param) /= In_Present (New_Param) | |
4396 | and then Ctype = Fully_Conformant | |
4397 | then | |
4398 | Conformance_Error | |
5d37ba92 | 4399 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
4400 | New_Formal); |
4401 | return; | |
4402 | end if; | |
4403 | ||
4404 | -- Grouping (use of comma in param lists) must be the same | |
4405 | -- This is where we catch a misconformance like: | |
4406 | ||
0a36105d | 4407 | -- A, B : Integer |
996ae0b0 RK |
4408 | -- A : Integer; B : Integer |
4409 | ||
4410 | -- which are represented identically in the tree except | |
4411 | -- for the setting of the flags More_Ids and Prev_Ids. | |
4412 | ||
4413 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
4414 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
4415 | then | |
4416 | Conformance_Error | |
5d37ba92 | 4417 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
4418 | return; |
4419 | end if; | |
4420 | end; | |
4421 | end if; | |
4422 | ||
41251c60 JM |
4423 | -- This label is required when skipping controlling formals |
4424 | ||
4425 | <<Skip_Controlling_Formal>> | |
4426 | ||
996ae0b0 RK |
4427 | Next_Formal (Old_Formal); |
4428 | Next_Formal (New_Formal); | |
4429 | end loop; | |
4430 | ||
4431 | if Present (Old_Formal) then | |
5d37ba92 | 4432 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
4433 | return; |
4434 | ||
4435 | elsif Present (New_Formal) then | |
5d37ba92 | 4436 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
4437 | return; |
4438 | end if; | |
996ae0b0 RK |
4439 | end Check_Conformance; |
4440 | ||
ec4867fa ES |
4441 | ----------------------- |
4442 | -- Check_Conventions -- | |
4443 | ----------------------- | |
4444 | ||
4445 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 4446 | Ifaces_List : Elist_Id; |
0a36105d | 4447 | |
ce2b6ba5 | 4448 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
4449 | -- Verify that the convention of inherited dispatching operation Op is |
4450 | -- consistent among all subprograms it overrides. In order to minimize | |
4451 | -- the search, Search_From is utilized to designate a specific point in | |
4452 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
4453 | |
4454 | ---------------------- | |
4455 | -- Check_Convention -- | |
4456 | ---------------------- | |
4457 | ||
ce2b6ba5 JM |
4458 | procedure Check_Convention (Op : Entity_Id) is |
4459 | Iface_Elmt : Elmt_Id; | |
4460 | Iface_Prim_Elmt : Elmt_Id; | |
4461 | Iface_Prim : Entity_Id; | |
ec4867fa | 4462 | |
ce2b6ba5 JM |
4463 | begin |
4464 | Iface_Elmt := First_Elmt (Ifaces_List); | |
4465 | while Present (Iface_Elmt) loop | |
4466 | Iface_Prim_Elmt := | |
4467 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); | |
4468 | while Present (Iface_Prim_Elmt) loop | |
4469 | Iface_Prim := Node (Iface_Prim_Elmt); | |
4470 | ||
4471 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
4472 | and then Convention (Iface_Prim) /= Convention (Op) | |
4473 | then | |
ed2233dc | 4474 | Error_Msg_N |
ce2b6ba5 | 4475 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 4476 | |
ce2b6ba5 JM |
4477 | Error_Msg_Name_1 := Chars (Op); |
4478 | Error_Msg_Name_2 := Get_Convention_Name (Convention (Op)); | |
4479 | Error_Msg_Sloc := Sloc (Op); | |
ec4867fa | 4480 | |
7a963087 | 4481 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 4482 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 4483 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 4484 | else |
ed2233dc | 4485 | Error_Msg_N |
19d846a0 RD |
4486 | ("\\overriding operation % with " & |
4487 | "convention % defined #", Typ); | |
ce2b6ba5 | 4488 | end if; |
ec4867fa | 4489 | |
ce2b6ba5 JM |
4490 | else pragma Assert (Present (Alias (Op))); |
4491 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
ed2233dc | 4492 | Error_Msg_N |
19d846a0 RD |
4493 | ("\\inherited operation % with " & |
4494 | "convention % defined #", Typ); | |
ce2b6ba5 | 4495 | end if; |
ec4867fa | 4496 | |
ce2b6ba5 JM |
4497 | Error_Msg_Name_1 := Chars (Op); |
4498 | Error_Msg_Name_2 := | |
4499 | Get_Convention_Name (Convention (Iface_Prim)); | |
4500 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
ed2233dc | 4501 | Error_Msg_N |
19d846a0 RD |
4502 | ("\\overridden operation % with " & |
4503 | "convention % defined #", Typ); | |
ec4867fa | 4504 | |
ce2b6ba5 | 4505 | -- Avoid cascading errors |
ec4867fa | 4506 | |
ce2b6ba5 JM |
4507 | return; |
4508 | end if; | |
ec4867fa | 4509 | |
ce2b6ba5 JM |
4510 | Next_Elmt (Iface_Prim_Elmt); |
4511 | end loop; | |
ec4867fa | 4512 | |
ce2b6ba5 | 4513 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
4514 | end loop; |
4515 | end Check_Convention; | |
4516 | ||
4517 | -- Local variables | |
4518 | ||
4519 | Prim_Op : Entity_Id; | |
4520 | Prim_Op_Elmt : Elmt_Id; | |
4521 | ||
4522 | -- Start of processing for Check_Conventions | |
4523 | ||
4524 | begin | |
ce2b6ba5 JM |
4525 | if not Has_Interfaces (Typ) then |
4526 | return; | |
4527 | end if; | |
4528 | ||
4529 | Collect_Interfaces (Typ, Ifaces_List); | |
4530 | ||
0a36105d JM |
4531 | -- The algorithm checks every overriding dispatching operation against |
4532 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 4533 | -- differences in conventions. |
ec4867fa ES |
4534 | |
4535 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
4536 | while Present (Prim_Op_Elmt) loop | |
4537 | Prim_Op := Node (Prim_Op_Elmt); | |
4538 | ||
0a36105d | 4539 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 4540 | -- since they always have the same convention. |
ec4867fa | 4541 | |
ce2b6ba5 JM |
4542 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
4543 | Check_Convention (Prim_Op); | |
ec4867fa ES |
4544 | end if; |
4545 | ||
4546 | Next_Elmt (Prim_Op_Elmt); | |
4547 | end loop; | |
4548 | end Check_Conventions; | |
4549 | ||
996ae0b0 RK |
4550 | ------------------------------ |
4551 | -- Check_Delayed_Subprogram -- | |
4552 | ------------------------------ | |
4553 | ||
4554 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
4555 | F : Entity_Id; | |
4556 | ||
4557 | procedure Possible_Freeze (T : Entity_Id); | |
4558 | -- T is the type of either a formal parameter or of the return type. | |
4559 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
4560 | -- subprogram itself must be delayed. If T is the limited view of an |
4561 | -- incomplete type the subprogram must be frozen as well, because | |
4562 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 4563 | |
82c80734 RD |
4564 | --------------------- |
4565 | -- Possible_Freeze -- | |
4566 | --------------------- | |
4567 | ||
996ae0b0 RK |
4568 | procedure Possible_Freeze (T : Entity_Id) is |
4569 | begin | |
4a13695c | 4570 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
4571 | Set_Has_Delayed_Freeze (Designator); |
4572 | ||
4573 | elsif Is_Access_Type (T) | |
4574 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
4575 | and then not Is_Frozen (Designated_Type (T)) | |
4576 | then | |
4577 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 4578 | |
4a13695c | 4579 | elsif Ekind (T) = E_Incomplete_Type and then From_With_Type (T) then |
e358346d | 4580 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 4581 | |
9aff36e9 RD |
4582 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
4583 | -- of a subprogram or entry declaration. | |
406935b6 AC |
4584 | |
4585 | elsif Ekind (T) = E_Incomplete_Type | |
4586 | and then Ada_Version >= Ada_2012 | |
4587 | then | |
4588 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 4589 | end if; |
4a13695c | 4590 | |
996ae0b0 RK |
4591 | end Possible_Freeze; |
4592 | ||
4593 | -- Start of processing for Check_Delayed_Subprogram | |
4594 | ||
4595 | begin | |
76e3504f AC |
4596 | -- All subprograms, including abstract subprograms, may need a freeze |
4597 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 4598 | |
76e3504f AC |
4599 | Possible_Freeze (Etype (Designator)); |
4600 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 4601 | |
76e3504f AC |
4602 | -- Need delayed freeze if any of the formal types themselves need |
4603 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 4604 | |
76e3504f AC |
4605 | F := First_Formal (Designator); |
4606 | while Present (F) loop | |
4607 | Possible_Freeze (Etype (F)); | |
4608 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
4609 | Next_Formal (F); | |
4610 | end loop; | |
996ae0b0 RK |
4611 | |
4612 | -- Mark functions that return by reference. Note that it cannot be | |
4613 | -- done for delayed_freeze subprograms because the underlying | |
4614 | -- returned type may not be known yet (for private types) | |
4615 | ||
4616 | if not Has_Delayed_Freeze (Designator) | |
4617 | and then Expander_Active | |
4618 | then | |
4619 | declare | |
4620 | Typ : constant Entity_Id := Etype (Designator); | |
4621 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
9694c039 | 4622 | |
996ae0b0 | 4623 | begin |
40f07b4b | 4624 | if Is_Immutably_Limited_Type (Typ) then |
996ae0b0 | 4625 | Set_Returns_By_Ref (Designator); |
9694c039 | 4626 | |
048e5cef | 4627 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
4628 | Set_Returns_By_Ref (Designator); |
4629 | end if; | |
4630 | end; | |
4631 | end if; | |
4632 | end Check_Delayed_Subprogram; | |
4633 | ||
4634 | ------------------------------------ | |
4635 | -- Check_Discriminant_Conformance -- | |
4636 | ------------------------------------ | |
4637 | ||
4638 | procedure Check_Discriminant_Conformance | |
4639 | (N : Node_Id; | |
4640 | Prev : Entity_Id; | |
4641 | Prev_Loc : Node_Id) | |
4642 | is | |
4643 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
4644 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
4645 | New_Discr_Id : Entity_Id; | |
4646 | New_Discr_Type : Entity_Id; | |
4647 | ||
4648 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
4649 | -- Post error message for conformance error on given node. Two messages |
4650 | -- are output. The first points to the previous declaration with a | |
4651 | -- general "no conformance" message. The second is the detailed reason, | |
4652 | -- supplied as Msg. The parameter N provide information for a possible | |
4653 | -- & insertion in the message. | |
996ae0b0 RK |
4654 | |
4655 | ----------------------- | |
4656 | -- Conformance_Error -- | |
4657 | ----------------------- | |
4658 | ||
4659 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
4660 | begin | |
4661 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
4662 | Error_Msg_N -- CODEFIX |
4663 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
4664 | Error_Msg_NE (Msg, N, N); |
4665 | end Conformance_Error; | |
4666 | ||
4667 | -- Start of processing for Check_Discriminant_Conformance | |
4668 | ||
4669 | begin | |
4670 | while Present (Old_Discr) and then Present (New_Discr) loop | |
4671 | ||
4672 | New_Discr_Id := Defining_Identifier (New_Discr); | |
4673 | ||
82c80734 RD |
4674 | -- The subtype mark of the discriminant on the full type has not |
4675 | -- been analyzed so we do it here. For an access discriminant a new | |
4676 | -- type is created. | |
996ae0b0 RK |
4677 | |
4678 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
4679 | New_Discr_Type := | |
4680 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
4681 | ||
4682 | else | |
4683 | Analyze (Discriminant_Type (New_Discr)); | |
4684 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
4685 | |
4686 | -- Ada 2005: if the discriminant definition carries a null | |
4687 | -- exclusion, create an itype to check properly for consistency | |
4688 | -- with partial declaration. | |
4689 | ||
4690 | if Is_Access_Type (New_Discr_Type) | |
4691 | and then Null_Exclusion_Present (New_Discr) | |
4692 | then | |
4693 | New_Discr_Type := | |
4694 | Create_Null_Excluding_Itype | |
4695 | (T => New_Discr_Type, | |
4696 | Related_Nod => New_Discr, | |
4697 | Scope_Id => Current_Scope); | |
4698 | end if; | |
996ae0b0 RK |
4699 | end if; |
4700 | ||
4701 | if not Conforming_Types | |
4702 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
4703 | then | |
4704 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
4705 | return; | |
fbf5a39b | 4706 | else |
82c80734 RD |
4707 | -- Treat the new discriminant as an occurrence of the old one, |
4708 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
4709 | -- information, for completeness. |
4710 | ||
4711 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
4712 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
4713 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
4714 | end if; |
4715 | ||
4716 | -- Names must match | |
4717 | ||
4718 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
4719 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
4720 | return; | |
4721 | end if; | |
4722 | ||
4723 | -- Default expressions must match | |
4724 | ||
4725 | declare | |
4726 | NewD : constant Boolean := | |
4727 | Present (Expression (New_Discr)); | |
4728 | OldD : constant Boolean := | |
4729 | Present (Expression (Parent (Old_Discr))); | |
4730 | ||
4731 | begin | |
4732 | if NewD or OldD then | |
4733 | ||
4734 | -- The old default value has been analyzed and expanded, | |
4735 | -- because the current full declaration will have frozen | |
82c80734 RD |
4736 | -- everything before. The new default values have not been |
4737 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
4738 | |
4739 | if NewD then | |
21d27997 | 4740 | Preanalyze_Spec_Expression |
996ae0b0 RK |
4741 | (Expression (New_Discr), New_Discr_Type); |
4742 | end if; | |
4743 | ||
4744 | if not (NewD and OldD) | |
4745 | or else not Fully_Conformant_Expressions | |
4746 | (Expression (Parent (Old_Discr)), | |
4747 | Expression (New_Discr)) | |
4748 | ||
4749 | then | |
4750 | Conformance_Error | |
4751 | ("default expression for & does not match!", | |
4752 | New_Discr_Id); | |
4753 | return; | |
4754 | end if; | |
4755 | end if; | |
4756 | end; | |
4757 | ||
4758 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
4759 | ||
0ab80019 | 4760 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
4761 | declare |
4762 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
4763 | ||
4764 | begin | |
4765 | -- Grouping (use of comma in param lists) must be the same | |
4766 | -- This is where we catch a misconformance like: | |
4767 | ||
60370fb1 | 4768 | -- A, B : Integer |
996ae0b0 RK |
4769 | -- A : Integer; B : Integer |
4770 | ||
4771 | -- which are represented identically in the tree except | |
4772 | -- for the setting of the flags More_Ids and Prev_Ids. | |
4773 | ||
4774 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
4775 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
4776 | then | |
4777 | Conformance_Error | |
4778 | ("grouping of & does not match!", New_Discr_Id); | |
4779 | return; | |
4780 | end if; | |
4781 | end; | |
4782 | end if; | |
4783 | ||
4784 | Next_Discriminant (Old_Discr); | |
4785 | Next (New_Discr); | |
4786 | end loop; | |
4787 | ||
4788 | if Present (Old_Discr) then | |
4789 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
4790 | return; | |
4791 | ||
4792 | elsif Present (New_Discr) then | |
4793 | Conformance_Error | |
4794 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
4795 | return; | |
4796 | end if; | |
4797 | end Check_Discriminant_Conformance; | |
4798 | ||
4799 | ---------------------------- | |
4800 | -- Check_Fully_Conformant -- | |
4801 | ---------------------------- | |
4802 | ||
4803 | procedure Check_Fully_Conformant | |
4804 | (New_Id : Entity_Id; | |
4805 | Old_Id : Entity_Id; | |
4806 | Err_Loc : Node_Id := Empty) | |
4807 | is | |
4808 | Result : Boolean; | |
81db9d77 | 4809 | pragma Warnings (Off, Result); |
996ae0b0 RK |
4810 | begin |
4811 | Check_Conformance | |
4812 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
4813 | end Check_Fully_Conformant; | |
4814 | ||
4815 | --------------------------- | |
4816 | -- Check_Mode_Conformant -- | |
4817 | --------------------------- | |
4818 | ||
4819 | procedure Check_Mode_Conformant | |
4820 | (New_Id : Entity_Id; | |
4821 | Old_Id : Entity_Id; | |
4822 | Err_Loc : Node_Id := Empty; | |
4823 | Get_Inst : Boolean := False) | |
4824 | is | |
4825 | Result : Boolean; | |
81db9d77 | 4826 | pragma Warnings (Off, Result); |
996ae0b0 RK |
4827 | begin |
4828 | Check_Conformance | |
4829 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
4830 | end Check_Mode_Conformant; | |
4831 | ||
fbf5a39b | 4832 | -------------------------------- |
758c442c | 4833 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
4834 | -------------------------------- |
4835 | ||
758c442c | 4836 | procedure Check_Overriding_Indicator |
ec4867fa | 4837 | (Subp : Entity_Id; |
5d37ba92 ES |
4838 | Overridden_Subp : Entity_Id; |
4839 | Is_Primitive : Boolean) | |
fbf5a39b | 4840 | is |
758c442c GD |
4841 | Decl : Node_Id; |
4842 | Spec : Node_Id; | |
fbf5a39b AC |
4843 | |
4844 | begin | |
ec4867fa | 4845 | -- No overriding indicator for literals |
fbf5a39b | 4846 | |
ec4867fa | 4847 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 4848 | return; |
fbf5a39b | 4849 | |
ec4867fa ES |
4850 | elsif Ekind (Subp) = E_Entry then |
4851 | Decl := Parent (Subp); | |
4852 | ||
53b10ce9 AC |
4853 | -- No point in analyzing a malformed operator |
4854 | ||
4855 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
4856 | and then Error_Posted (Subp) | |
4857 | then | |
4858 | return; | |
4859 | ||
758c442c GD |
4860 | else |
4861 | Decl := Unit_Declaration_Node (Subp); | |
4862 | end if; | |
fbf5a39b | 4863 | |
800621e0 RD |
4864 | if Nkind_In (Decl, N_Subprogram_Body, |
4865 | N_Subprogram_Body_Stub, | |
4866 | N_Subprogram_Declaration, | |
4867 | N_Abstract_Subprogram_Declaration, | |
4868 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
4869 | then |
4870 | Spec := Specification (Decl); | |
ec4867fa ES |
4871 | |
4872 | elsif Nkind (Decl) = N_Entry_Declaration then | |
4873 | Spec := Decl; | |
4874 | ||
758c442c GD |
4875 | else |
4876 | return; | |
4877 | end if; | |
fbf5a39b | 4878 | |
e7d72fb9 AC |
4879 | -- The overriding operation is type conformant with the overridden one, |
4880 | -- but the names of the formals are not required to match. If the names | |
6823270c | 4881 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
4882 | -- source of confusion that is worth diagnosing. Controlling formals |
4883 | -- often carry names that reflect the type, and it is not worthwhile | |
4884 | -- requiring that their names match. | |
4885 | ||
c9e7bd8e | 4886 | if Present (Overridden_Subp) |
e7d72fb9 AC |
4887 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
4888 | then | |
4889 | declare | |
4890 | Form1 : Entity_Id; | |
4891 | Form2 : Entity_Id; | |
4892 | ||
4893 | begin | |
4894 | Form1 := First_Formal (Subp); | |
4895 | Form2 := First_Formal (Overridden_Subp); | |
4896 | ||
c9e7bd8e AC |
4897 | -- If the overriding operation is a synchronized operation, skip |
4898 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
4899 | -- implicit in the new one. If the operation is declared in the |
4900 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 4901 | |
6823270c AC |
4902 | if Is_Concurrent_Type (Scope (Subp)) |
4903 | and then Is_Tagged_Type (Scope (Subp)) | |
4904 | and then not Has_Completion (Scope (Subp)) | |
4905 | then | |
c9e7bd8e AC |
4906 | Form2 := Next_Formal (Form2); |
4907 | end if; | |
4908 | ||
e7d72fb9 AC |
4909 | if Present (Form1) then |
4910 | Form1 := Next_Formal (Form1); | |
4911 | Form2 := Next_Formal (Form2); | |
4912 | end if; | |
4913 | ||
4914 | while Present (Form1) loop | |
4915 | if not Is_Controlling_Formal (Form1) | |
4916 | and then Present (Next_Formal (Form2)) | |
4917 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
4918 | then | |
4919 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
4920 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 4921 | Error_Msg_NE |
19d846a0 | 4922 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
4923 | Form1, Form1); |
4924 | exit; | |
4925 | end if; | |
4926 | ||
4927 | Next_Formal (Form1); | |
4928 | Next_Formal (Form2); | |
4929 | end loop; | |
4930 | end; | |
4931 | end if; | |
4932 | ||
676e8420 AC |
4933 | -- If there is an overridden subprogram, then check that there is no |
4934 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
4935 | -- This is not done if the overridden subprogram is marked as hidden, |
4936 | -- which can occur for the case of inherited controlled operations | |
4937 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
4938 | -- subprogram is not itself hidden. (Note: This condition could probably | |
4939 | -- be simplified, leaving out the testing for the specific controlled | |
4940 | -- cases, but it seems safer and clearer this way, and echoes similar | |
4941 | -- special-case tests of this kind in other places.) | |
4942 | ||
fd0d899b | 4943 | if Present (Overridden_Subp) |
51bf9bdf AC |
4944 | and then (not Is_Hidden (Overridden_Subp) |
4945 | or else | |
4946 | ((Chars (Overridden_Subp) = Name_Initialize | |
f0709ca6 AC |
4947 | or else |
4948 | Chars (Overridden_Subp) = Name_Adjust | |
4949 | or else | |
4950 | Chars (Overridden_Subp) = Name_Finalize) | |
4951 | and then Present (Alias (Overridden_Subp)) | |
4952 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 4953 | then |
ec4867fa ES |
4954 | if Must_Not_Override (Spec) then |
4955 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 4956 | |
ec4867fa | 4957 | if Ekind (Subp) = E_Entry then |
ed2233dc | 4958 | Error_Msg_NE |
5d37ba92 | 4959 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 4960 | else |
ed2233dc | 4961 | Error_Msg_NE |
5d37ba92 | 4962 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 4963 | end if; |
21d27997 | 4964 | |
bd603506 | 4965 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
4966 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
4967 | -- operation. This operation should not be inherited by other limited | |
4968 | -- controlled types. An explicit Adjust for them is not overriding. | |
4969 | ||
4970 | elsif Must_Override (Spec) | |
4971 | and then Chars (Overridden_Subp) = Name_Adjust | |
4972 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
4973 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
4974 | and then |
4975 | Is_Predefined_File_Name | |
4976 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
4977 | then |
4978 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
4979 | ||
21d27997 | 4980 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
4981 | if Is_Init_Proc (Subp) then |
4982 | null; | |
4983 | ||
4984 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
4985 | |
4986 | -- For entities generated by Derive_Subprograms the overridden | |
4987 | -- operation is the inherited primitive (which is available | |
4988 | -- through the attribute alias) | |
4989 | ||
4990 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 4991 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 4992 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
4993 | and then Find_Dispatching_Type (Overridden_Subp) = |
4994 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
4995 | and then Present (Alias (Overridden_Subp)) |
4996 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
4997 | then | |
4998 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 4999 | |
1c1289e7 AC |
5000 | else |
5001 | Set_Overridden_Operation (Subp, Overridden_Subp); | |
5002 | end if; | |
5003 | end if; | |
ec4867fa | 5004 | end if; |
f937473f | 5005 | |
618fb570 AC |
5006 | -- If primitive flag is set or this is a protected operation, then |
5007 | -- the operation is overriding at the point of its declaration, so | |
5008 | -- warn if necessary. Otherwise it may have been declared before the | |
5009 | -- operation it overrides and no check is required. | |
3c25856a AC |
5010 | |
5011 | if Style_Check | |
618fb570 AC |
5012 | and then not Must_Override (Spec) |
5013 | and then (Is_Primitive | |
5014 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 5015 | then |
235f4375 AC |
5016 | Style.Missing_Overriding (Decl, Subp); |
5017 | end if; | |
5018 | ||
53b10ce9 AC |
5019 | -- If Subp is an operator, it may override a predefined operation, if |
5020 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 5021 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
5022 | -- representation for predefined operators. We have to check whether the |
5023 | -- signature of Subp matches that of a predefined operator. Note that | |
5024 | -- first argument provides the name of the operator, and the second | |
5025 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
5026 | -- If the indicator is overriding, then the operator must match a |
5027 | -- predefined signature, because we know already that there is no | |
5028 | -- explicit overridden operation. | |
f937473f | 5029 | |
21d27997 | 5030 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 5031 | if Must_Not_Override (Spec) then |
f937473f | 5032 | |
806f6d37 AC |
5033 | -- If this is not a primitive or a protected subprogram, then |
5034 | -- "not overriding" is illegal. | |
618fb570 | 5035 | |
806f6d37 AC |
5036 | if not Is_Primitive |
5037 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5038 | then | |
5039 | Error_Msg_N | |
5040 | ("overriding indicator only allowed " | |
5041 | & "if subprogram is primitive", Subp); | |
618fb570 | 5042 | |
806f6d37 AC |
5043 | elsif Can_Override_Operator (Subp) then |
5044 | Error_Msg_NE | |
5045 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
5046 | end if; | |
f937473f | 5047 | |
806f6d37 AC |
5048 | elsif Must_Override (Spec) then |
5049 | if No (Overridden_Operation (Subp)) | |
5050 | and then not Can_Override_Operator (Subp) | |
5051 | then | |
5052 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5053 | end if; | |
5d37ba92 | 5054 | |
806f6d37 AC |
5055 | elsif not Error_Posted (Subp) |
5056 | and then Style_Check | |
5057 | and then Can_Override_Operator (Subp) | |
5058 | and then | |
5059 | not Is_Predefined_File_Name | |
5060 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
5061 | then | |
5062 | -- If style checks are enabled, indicate that the indicator is | |
5063 | -- missing. However, at the point of declaration, the type of | |
5064 | -- which this is a primitive operation may be private, in which | |
5065 | -- case the indicator would be premature. | |
235f4375 | 5066 | |
806f6d37 AC |
5067 | if Has_Private_Declaration (Etype (Subp)) |
5068 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 5069 | then |
806f6d37 AC |
5070 | null; |
5071 | else | |
5072 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 5073 | end if; |
806f6d37 | 5074 | end if; |
21d27997 RD |
5075 | |
5076 | elsif Must_Override (Spec) then | |
5077 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 5078 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 5079 | else |
ed2233dc | 5080 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 5081 | end if; |
5d37ba92 ES |
5082 | |
5083 | -- If the operation is marked "not overriding" and it's not primitive | |
5084 | -- then an error is issued, unless this is an operation of a task or | |
5085 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
5086 | -- has been specified have already been checked above. | |
5087 | ||
5088 | elsif Must_Not_Override (Spec) | |
5089 | and then not Is_Primitive | |
5090 | and then Ekind (Subp) /= E_Entry | |
5091 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5092 | then | |
ed2233dc | 5093 | Error_Msg_N |
5d37ba92 ES |
5094 | ("overriding indicator only allowed if subprogram is primitive", |
5095 | Subp); | |
5d37ba92 | 5096 | return; |
fbf5a39b | 5097 | end if; |
758c442c | 5098 | end Check_Overriding_Indicator; |
fbf5a39b | 5099 | |
996ae0b0 RK |
5100 | ------------------- |
5101 | -- Check_Returns -- | |
5102 | ------------------- | |
5103 | ||
0a36105d JM |
5104 | -- Note: this procedure needs to know far too much about how the expander |
5105 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
5106 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
5107 | -- works, but is not very clean. It would be better if the expansion | |
5108 | -- routines would leave Original_Node working nicely, and we could use | |
5109 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
5110 | ||
996ae0b0 RK |
5111 | procedure Check_Returns |
5112 | (HSS : Node_Id; | |
5113 | Mode : Character; | |
c8ef728f ES |
5114 | Err : out Boolean; |
5115 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
5116 | is |
5117 | Handler : Node_Id; | |
5118 | ||
5119 | procedure Check_Statement_Sequence (L : List_Id); | |
5120 | -- Internal recursive procedure to check a list of statements for proper | |
5121 | -- termination by a return statement (or a transfer of control or a | |
5122 | -- compound statement that is itself internally properly terminated). | |
5123 | ||
5124 | ------------------------------ | |
5125 | -- Check_Statement_Sequence -- | |
5126 | ------------------------------ | |
5127 | ||
5128 | procedure Check_Statement_Sequence (L : List_Id) is | |
5129 | Last_Stm : Node_Id; | |
0a36105d | 5130 | Stm : Node_Id; |
996ae0b0 RK |
5131 | Kind : Node_Kind; |
5132 | ||
5133 | Raise_Exception_Call : Boolean; | |
5134 | -- Set True if statement sequence terminated by Raise_Exception call | |
5135 | -- or a Reraise_Occurrence call. | |
5136 | ||
5137 | begin | |
5138 | Raise_Exception_Call := False; | |
5139 | ||
5140 | -- Get last real statement | |
5141 | ||
5142 | Last_Stm := Last (L); | |
5143 | ||
0a36105d JM |
5144 | -- Deal with digging out exception handler statement sequences that |
5145 | -- have been transformed by the local raise to goto optimization. | |
5146 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
5147 | -- optimization has occurred, we are looking at something like: | |
5148 | ||
5149 | -- begin | |
5150 | -- original stmts in block | |
5151 | ||
5152 | -- exception \ | |
5153 | -- when excep1 => | | |
5154 | -- goto L1; | omitted if No_Exception_Propagation | |
5155 | -- when excep2 => | | |
5156 | -- goto L2; / | |
5157 | -- end; | |
5158 | ||
5159 | -- goto L3; -- skip handler when exception not raised | |
5160 | ||
5161 | -- <<L1>> -- target label for local exception | |
5162 | -- begin | |
5163 | -- estmts1 | |
5164 | -- end; | |
5165 | ||
5166 | -- goto L3; | |
5167 | ||
5168 | -- <<L2>> | |
5169 | -- begin | |
5170 | -- estmts2 | |
5171 | -- end; | |
5172 | ||
5173 | -- <<L3>> | |
5174 | ||
5175 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
5176 | -- sequences (which were the original sequences of statements in | |
5177 | -- the exception handlers) and check them. | |
5178 | ||
5179 | if Nkind (Last_Stm) = N_Label | |
5180 | and then Exception_Junk (Last_Stm) | |
5181 | then | |
5182 | Stm := Last_Stm; | |
5183 | loop | |
5184 | Prev (Stm); | |
5185 | exit when No (Stm); | |
5186 | exit when Nkind (Stm) /= N_Block_Statement; | |
5187 | exit when not Exception_Junk (Stm); | |
5188 | Prev (Stm); | |
5189 | exit when No (Stm); | |
5190 | exit when Nkind (Stm) /= N_Label; | |
5191 | exit when not Exception_Junk (Stm); | |
5192 | Check_Statement_Sequence | |
5193 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
5194 | ||
5195 | Prev (Stm); | |
5196 | Last_Stm := Stm; | |
5197 | exit when No (Stm); | |
5198 | exit when Nkind (Stm) /= N_Goto_Statement; | |
5199 | exit when not Exception_Junk (Stm); | |
5200 | end loop; | |
5201 | end if; | |
5202 | ||
996ae0b0 RK |
5203 | -- Don't count pragmas |
5204 | ||
5205 | while Nkind (Last_Stm) = N_Pragma | |
5206 | ||
5207 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
5208 | ||
5209 | or else | |
5210 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
5211 | and then | |
5212 | Nkind (Name (Last_Stm)) = N_Identifier | |
5213 | and then | |
5214 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
5215 | ||
5216 | -- Don't count exception junk | |
5217 | ||
5218 | or else | |
800621e0 RD |
5219 | (Nkind_In (Last_Stm, N_Goto_Statement, |
5220 | N_Label, | |
5221 | N_Object_Declaration) | |
0a36105d JM |
5222 | and then Exception_Junk (Last_Stm)) |
5223 | or else Nkind (Last_Stm) in N_Push_xxx_Label | |
5224 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
996ae0b0 RK |
5225 | loop |
5226 | Prev (Last_Stm); | |
5227 | end loop; | |
5228 | ||
5229 | -- Here we have the "real" last statement | |
5230 | ||
5231 | Kind := Nkind (Last_Stm); | |
5232 | ||
5233 | -- Transfer of control, OK. Note that in the No_Return procedure | |
5234 | -- case, we already diagnosed any explicit return statements, so | |
5235 | -- we can treat them as OK in this context. | |
5236 | ||
5237 | if Is_Transfer (Last_Stm) then | |
5238 | return; | |
5239 | ||
5240 | -- Check cases of explicit non-indirect procedure calls | |
5241 | ||
5242 | elsif Kind = N_Procedure_Call_Statement | |
5243 | and then Is_Entity_Name (Name (Last_Stm)) | |
5244 | then | |
5245 | -- Check call to Raise_Exception procedure which is treated | |
5246 | -- specially, as is a call to Reraise_Occurrence. | |
5247 | ||
5248 | -- We suppress the warning in these cases since it is likely that | |
5249 | -- the programmer really does not expect to deal with the case | |
5250 | -- of Null_Occurrence, and thus would find a warning about a | |
5251 | -- missing return curious, and raising Program_Error does not | |
5252 | -- seem such a bad behavior if this does occur. | |
5253 | ||
c8ef728f ES |
5254 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
5255 | -- behavior will be to raise Constraint_Error (see AI-329). | |
5256 | ||
996ae0b0 RK |
5257 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
5258 | or else | |
5259 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
5260 | then | |
5261 | Raise_Exception_Call := True; | |
5262 | ||
5263 | -- For Raise_Exception call, test first argument, if it is | |
5264 | -- an attribute reference for a 'Identity call, then we know | |
5265 | -- that the call cannot possibly return. | |
5266 | ||
5267 | declare | |
5268 | Arg : constant Node_Id := | |
5269 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
5270 | begin |
5271 | if Nkind (Arg) = N_Attribute_Reference | |
5272 | and then Attribute_Name (Arg) = Name_Identity | |
5273 | then | |
5274 | return; | |
5275 | end if; | |
5276 | end; | |
5277 | end if; | |
5278 | ||
5279 | -- If statement, need to look inside if there is an else and check | |
5280 | -- each constituent statement sequence for proper termination. | |
5281 | ||
5282 | elsif Kind = N_If_Statement | |
5283 | and then Present (Else_Statements (Last_Stm)) | |
5284 | then | |
5285 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
5286 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
5287 | ||
5288 | if Present (Elsif_Parts (Last_Stm)) then | |
5289 | declare | |
5290 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
5291 | ||
5292 | begin | |
5293 | while Present (Elsif_Part) loop | |
5294 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
5295 | Next (Elsif_Part); | |
5296 | end loop; | |
5297 | end; | |
5298 | end if; | |
5299 | ||
5300 | return; | |
5301 | ||
5302 | -- Case statement, check each case for proper termination | |
5303 | ||
5304 | elsif Kind = N_Case_Statement then | |
5305 | declare | |
5306 | Case_Alt : Node_Id; | |
996ae0b0 RK |
5307 | begin |
5308 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
5309 | while Present (Case_Alt) loop | |
5310 | Check_Statement_Sequence (Statements (Case_Alt)); | |
5311 | Next_Non_Pragma (Case_Alt); | |
5312 | end loop; | |
5313 | end; | |
5314 | ||
5315 | return; | |
5316 | ||
5317 | -- Block statement, check its handled sequence of statements | |
5318 | ||
5319 | elsif Kind = N_Block_Statement then | |
5320 | declare | |
5321 | Err1 : Boolean; | |
5322 | ||
5323 | begin | |
5324 | Check_Returns | |
5325 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
5326 | ||
5327 | if Err1 then | |
5328 | Err := True; | |
5329 | end if; | |
5330 | ||
5331 | return; | |
5332 | end; | |
5333 | ||
5334 | -- Loop statement. If there is an iteration scheme, we can definitely | |
5335 | -- fall out of the loop. Similarly if there is an exit statement, we | |
5336 | -- can fall out. In either case we need a following return. | |
5337 | ||
5338 | elsif Kind = N_Loop_Statement then | |
5339 | if Present (Iteration_Scheme (Last_Stm)) | |
5340 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
5341 | then | |
5342 | null; | |
5343 | ||
f3d57416 RW |
5344 | -- A loop with no exit statement or iteration scheme is either |
5345 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
5346 | -- In either case, no warning is required. |
5347 | ||
5348 | else | |
5349 | return; | |
5350 | end if; | |
5351 | ||
5352 | -- Timed entry call, check entry call and delay alternatives | |
5353 | ||
5354 | -- Note: in expanded code, the timed entry call has been converted | |
5355 | -- to a set of expanded statements on which the check will work | |
5356 | -- correctly in any case. | |
5357 | ||
5358 | elsif Kind = N_Timed_Entry_Call then | |
5359 | declare | |
5360 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
5361 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
5362 | ||
5363 | begin | |
5364 | -- If statement sequence of entry call alternative is missing, | |
5365 | -- then we can definitely fall through, and we post the error | |
5366 | -- message on the entry call alternative itself. | |
5367 | ||
5368 | if No (Statements (ECA)) then | |
5369 | Last_Stm := ECA; | |
5370 | ||
5371 | -- If statement sequence of delay alternative is missing, then | |
5372 | -- we can definitely fall through, and we post the error | |
5373 | -- message on the delay alternative itself. | |
5374 | ||
5375 | -- Note: if both ECA and DCA are missing the return, then we | |
5376 | -- post only one message, should be enough to fix the bugs. | |
5377 | -- If not we will get a message next time on the DCA when the | |
5378 | -- ECA is fixed! | |
5379 | ||
5380 | elsif No (Statements (DCA)) then | |
5381 | Last_Stm := DCA; | |
5382 | ||
5383 | -- Else check both statement sequences | |
5384 | ||
5385 | else | |
5386 | Check_Statement_Sequence (Statements (ECA)); | |
5387 | Check_Statement_Sequence (Statements (DCA)); | |
5388 | return; | |
5389 | end if; | |
5390 | end; | |
5391 | ||
5392 | -- Conditional entry call, check entry call and else part | |
5393 | ||
5394 | -- Note: in expanded code, the conditional entry call has been | |
5395 | -- converted to a set of expanded statements on which the check | |
5396 | -- will work correctly in any case. | |
5397 | ||
5398 | elsif Kind = N_Conditional_Entry_Call then | |
5399 | declare | |
5400 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
5401 | ||
5402 | begin | |
5403 | -- If statement sequence of entry call alternative is missing, | |
5404 | -- then we can definitely fall through, and we post the error | |
5405 | -- message on the entry call alternative itself. | |
5406 | ||
5407 | if No (Statements (ECA)) then | |
5408 | Last_Stm := ECA; | |
5409 | ||
5410 | -- Else check statement sequence and else part | |
5411 | ||
5412 | else | |
5413 | Check_Statement_Sequence (Statements (ECA)); | |
5414 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
5415 | return; | |
5416 | end if; | |
5417 | end; | |
5418 | end if; | |
5419 | ||
5420 | -- If we fall through, issue appropriate message | |
5421 | ||
5422 | if Mode = 'F' then | |
996ae0b0 RK |
5423 | if not Raise_Exception_Call then |
5424 | Error_Msg_N | |
5d37ba92 | 5425 | ("?RETURN statement missing following this statement!", |
996ae0b0 RK |
5426 | Last_Stm); |
5427 | Error_Msg_N | |
5d37ba92 | 5428 | ("\?Program_Error may be raised at run time!", |
996ae0b0 RK |
5429 | Last_Stm); |
5430 | end if; | |
5431 | ||
5432 | -- Note: we set Err even though we have not issued a warning | |
5433 | -- because we still have a case of a missing return. This is | |
5434 | -- an extremely marginal case, probably will never be noticed | |
5435 | -- but we might as well get it right. | |
5436 | ||
5437 | Err := True; | |
5438 | ||
c8ef728f ES |
5439 | -- Otherwise we have the case of a procedure marked No_Return |
5440 | ||
996ae0b0 | 5441 | else |
800621e0 RD |
5442 | if not Raise_Exception_Call then |
5443 | Error_Msg_N | |
5444 | ("?implied return after this statement " & | |
5445 | "will raise Program_Error", | |
5446 | Last_Stm); | |
5447 | Error_Msg_NE | |
5448 | ("\?procedure & is marked as No_Return!", | |
5449 | Last_Stm, Proc); | |
5450 | end if; | |
c8ef728f ES |
5451 | |
5452 | declare | |
5453 | RE : constant Node_Id := | |
5454 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
5455 | Reason => PE_Implicit_Return); | |
5456 | begin | |
5457 | Insert_After (Last_Stm, RE); | |
5458 | Analyze (RE); | |
5459 | end; | |
996ae0b0 RK |
5460 | end if; |
5461 | end Check_Statement_Sequence; | |
5462 | ||
5463 | -- Start of processing for Check_Returns | |
5464 | ||
5465 | begin | |
5466 | Err := False; | |
5467 | Check_Statement_Sequence (Statements (HSS)); | |
5468 | ||
5469 | if Present (Exception_Handlers (HSS)) then | |
5470 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
5471 | while Present (Handler) loop | |
5472 | Check_Statement_Sequence (Statements (Handler)); | |
5473 | Next_Non_Pragma (Handler); | |
5474 | end loop; | |
5475 | end if; | |
5476 | end Check_Returns; | |
5477 | ||
67c86178 AC |
5478 | ------------------------------- |
5479 | -- Check_Subprogram_Contract -- | |
5480 | ------------------------------- | |
5481 | ||
5482 | procedure Check_Subprogram_Contract (Spec_Id : Entity_Id) is | |
5483 | ||
029b67ba YM |
5484 | -- Code is currently commented out as, in some cases, it causes crashes |
5485 | -- because Direct_Primitive_Operations is not available for a private | |
5486 | -- type. This may cause more warnings to be issued than necessary. See | |
5487 | -- below for the intended use of this variable. ??? | |
5488 | ||
67c86178 AC |
5489 | -- Inherited : constant Subprogram_List := |
5490 | -- Inherited_Subprograms (Spec_Id); | |
dc36a7e3 | 5491 | -- -- List of subprograms inherited by this subprogram |
67c86178 | 5492 | |
dc36a7e3 | 5493 | Last_Postcondition : Node_Id := Empty; |
67c86178 AC |
5494 | -- Last postcondition on the subprogram, or else Empty if either no |
5495 | -- postcondition or only inherited postconditions. | |
5496 | ||
5497 | Attribute_Result_Mentioned : Boolean := False; | |
5498 | -- Whether attribute 'Result is mentioned in a postcondition | |
5499 | ||
dc36a7e3 | 5500 | Post_State_Mentioned : Boolean := False; |
67c86178 AC |
5501 | -- Whether some expression mentioned in a postcondition can have a |
5502 | -- different value in the post-state than in the pre-state. | |
5503 | ||
5504 | function Check_Attr_Result (N : Node_Id) return Traverse_Result; | |
dc36a7e3 RD |
5505 | -- Check if N is a reference to the attribute 'Result, and if so set |
5506 | -- Attribute_Result_Mentioned and return Abandon. Otherwise return OK. | |
67c86178 AC |
5507 | |
5508 | function Check_Post_State (N : Node_Id) return Traverse_Result; | |
5509 | -- Check whether the value of evaluating N can be different in the | |
5510 | -- post-state, compared to the same evaluation in the pre-state, and | |
5511 | -- if so set Post_State_Mentioned and return Abandon. Return Skip on | |
5512 | -- reference to attribute 'Old, in order to ignore its prefix, which | |
5513 | -- is precisely evaluated in the pre-state. Otherwise return OK. | |
5514 | ||
dc36a7e3 | 5515 | procedure Process_Post_Conditions (Spec : Node_Id; Class : Boolean); |
67c86178 AC |
5516 | -- This processes the Spec_PPC_List from Spec, processing any |
5517 | -- postconditions from the list. If Class is True, then only | |
5518 | -- postconditions marked with Class_Present are considered. The | |
5519 | -- caller has checked that Spec_PPC_List is non-Empty. | |
5520 | ||
5521 | function Find_Attribute_Result is new Traverse_Func (Check_Attr_Result); | |
5522 | ||
5523 | function Find_Post_State is new Traverse_Func (Check_Post_State); | |
5524 | ||
5525 | ----------------------- | |
5526 | -- Check_Attr_Result -- | |
5527 | ----------------------- | |
5528 | ||
5529 | function Check_Attr_Result (N : Node_Id) return Traverse_Result is | |
5530 | begin | |
5531 | if Nkind (N) = N_Attribute_Reference | |
dc36a7e3 | 5532 | and then Get_Attribute_Id (Attribute_Name (N)) = Attribute_Result |
67c86178 AC |
5533 | then |
5534 | Attribute_Result_Mentioned := True; | |
5535 | return Abandon; | |
5536 | else | |
5537 | return OK; | |
5538 | end if; | |
5539 | end Check_Attr_Result; | |
5540 | ||
5541 | ---------------------- | |
5542 | -- Check_Post_State -- | |
5543 | ---------------------- | |
5544 | ||
5545 | function Check_Post_State (N : Node_Id) return Traverse_Result is | |
5546 | Found : Boolean := False; | |
5547 | ||
5548 | begin | |
5549 | case Nkind (N) is | |
5550 | when N_Function_Call | | |
5551 | N_Explicit_Dereference => | |
5552 | Found := True; | |
5553 | ||
5554 | when N_Identifier | | |
5555 | N_Expanded_Name => | |
dc36a7e3 | 5556 | |
67c86178 AC |
5557 | declare |
5558 | E : constant Entity_Id := Entity (N); | |
bd38b431 | 5559 | |
67c86178 | 5560 | begin |
bd38b431 AC |
5561 | -- ???Quantified expressions get analyzed later, so E can |
5562 | -- be empty at this point. In this case, we suppress the | |
5b5588dd AC |
5563 | -- warning, just in case E is assignable. It seems better to |
5564 | -- have false negatives than false positives. At some point, | |
5565 | -- we should make the warning more accurate, either by | |
bd38b431 AC |
5566 | -- analyzing quantified expressions earlier, or moving |
5567 | -- this processing later. | |
5b5588dd | 5568 | |
bd38b431 AC |
5569 | if No (E) |
5570 | or else | |
5571 | (Is_Entity_Name (N) | |
5572 | and then Ekind (E) in Assignable_Kind) | |
67c86178 AC |
5573 | then |
5574 | Found := True; | |
5575 | end if; | |
5576 | end; | |
5577 | ||
5578 | when N_Attribute_Reference => | |
5579 | case Get_Attribute_Id (Attribute_Name (N)) is | |
5580 | when Attribute_Old => | |
5581 | return Skip; | |
5582 | when Attribute_Result => | |
5583 | Found := True; | |
5584 | when others => | |
5585 | null; | |
5586 | end case; | |
5587 | ||
5588 | when others => | |
5589 | null; | |
5590 | end case; | |
5591 | ||
5592 | if Found then | |
5593 | Post_State_Mentioned := True; | |
5594 | return Abandon; | |
5595 | else | |
5596 | return OK; | |
5597 | end if; | |
5598 | end Check_Post_State; | |
5599 | ||
5600 | ----------------------------- | |
5601 | -- Process_Post_Conditions -- | |
5602 | ----------------------------- | |
5603 | ||
5604 | procedure Process_Post_Conditions | |
5605 | (Spec : Node_Id; | |
5606 | Class : Boolean) | |
5607 | is | |
5608 | Prag : Node_Id; | |
5609 | Arg : Node_Id; | |
5610 | Ignored : Traverse_Final_Result; | |
5611 | pragma Unreferenced (Ignored); | |
5612 | ||
5613 | begin | |
5614 | Prag := Spec_PPC_List (Contract (Spec)); | |
5615 | ||
5616 | loop | |
5617 | Arg := First (Pragma_Argument_Associations (Prag)); | |
5618 | ||
dc36a7e3 | 5619 | -- Since pre- and post-conditions are listed in reverse order, the |
67c86178 AC |
5620 | -- first postcondition in the list is the last in the source. |
5621 | ||
5622 | if Pragma_Name (Prag) = Name_Postcondition | |
5623 | and then not Class | |
5624 | and then No (Last_Postcondition) | |
5625 | then | |
5626 | Last_Postcondition := Prag; | |
5627 | end if; | |
5628 | ||
5629 | -- For functions, look for presence of 'Result in postcondition | |
5630 | ||
5631 | if Ekind_In (Spec_Id, E_Function, E_Generic_Function) then | |
5632 | Ignored := Find_Attribute_Result (Arg); | |
5633 | end if; | |
5634 | ||
5635 | -- For each individual non-inherited postcondition, look for | |
5636 | -- presence of an expression that could be evaluated differently | |
5637 | -- in post-state. | |
5638 | ||
5639 | if Pragma_Name (Prag) = Name_Postcondition | |
5640 | and then not Class | |
5641 | then | |
5642 | Post_State_Mentioned := False; | |
dc36a7e3 | 5643 | Ignored := Find_Post_State (Arg); |
67c86178 AC |
5644 | |
5645 | if not Post_State_Mentioned then | |
5b5588dd | 5646 | Error_Msg_N ("?postcondition refers only to pre-state", |
67c86178 AC |
5647 | Prag); |
5648 | end if; | |
5649 | end if; | |
5650 | ||
5651 | Prag := Next_Pragma (Prag); | |
5652 | exit when No (Prag); | |
5653 | end loop; | |
5654 | end Process_Post_Conditions; | |
5655 | ||
5656 | -- Start of processing for Check_Subprogram_Contract | |
5657 | ||
5658 | begin | |
5659 | if not Warn_On_Suspicious_Contract then | |
5660 | return; | |
5661 | end if; | |
5662 | ||
5663 | if Present (Spec_PPC_List (Contract (Spec_Id))) then | |
5664 | Process_Post_Conditions (Spec_Id, Class => False); | |
5665 | end if; | |
5666 | ||
5667 | -- Process inherited postconditions | |
5668 | ||
5669 | -- Code is currently commented out as, in some cases, it causes crashes | |
5670 | -- because Direct_Primitive_Operations is not available for a private | |
dc36a7e3 | 5671 | -- type. This may cause more warnings to be issued than necessary. ??? |
67c86178 AC |
5672 | |
5673 | -- for J in Inherited'Range loop | |
5674 | -- if Present (Spec_PPC_List (Contract (Inherited (J)))) then | |
5675 | -- Process_Post_Conditions (Inherited (J), Class => True); | |
5676 | -- end if; | |
5677 | -- end loop; | |
5678 | ||
5679 | -- Issue warning for functions whose postcondition does not mention | |
5680 | -- 'Result after all postconditions have been processed. | |
5681 | ||
5682 | if Ekind_In (Spec_Id, E_Function, E_Generic_Function) | |
5683 | and then Present (Last_Postcondition) | |
5684 | and then not Attribute_Result_Mentioned | |
5685 | then | |
5686 | Error_Msg_N ("?function postcondition does not mention result", | |
5687 | Last_Postcondition); | |
5688 | end if; | |
5689 | end Check_Subprogram_Contract; | |
5690 | ||
996ae0b0 RK |
5691 | ---------------------------- |
5692 | -- Check_Subprogram_Order -- | |
5693 | ---------------------------- | |
5694 | ||
5695 | procedure Check_Subprogram_Order (N : Node_Id) is | |
5696 | ||
5697 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
5698 | -- This is used to check if S1 > S2 in the sense required by this test, |
5699 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 5700 | |
82c80734 RD |
5701 | ----------------------------- |
5702 | -- Subprogram_Name_Greater -- | |
5703 | ----------------------------- | |
5704 | ||
996ae0b0 RK |
5705 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
5706 | L1, L2 : Positive; | |
5707 | N1, N2 : Natural; | |
5708 | ||
5709 | begin | |
5710 | -- Remove trailing numeric parts | |
5711 | ||
5712 | L1 := S1'Last; | |
5713 | while S1 (L1) in '0' .. '9' loop | |
5714 | L1 := L1 - 1; | |
5715 | end loop; | |
5716 | ||
5717 | L2 := S2'Last; | |
5718 | while S2 (L2) in '0' .. '9' loop | |
5719 | L2 := L2 - 1; | |
5720 | end loop; | |
5721 | ||
5722 | -- If non-numeric parts non-equal, that's decisive | |
5723 | ||
5724 | if S1 (S1'First .. L1) < S2 (S2'First .. L2) then | |
5725 | return False; | |
5726 | ||
5727 | elsif S1 (S1'First .. L1) > S2 (S2'First .. L2) then | |
5728 | return True; | |
5729 | ||
5730 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
5731 | -- that a missing suffix is treated as numeric zero in this test. | |
5732 | ||
5733 | else | |
5734 | N1 := 0; | |
5735 | while L1 < S1'Last loop | |
5736 | L1 := L1 + 1; | |
5737 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
5738 | end loop; | |
5739 | ||
5740 | N2 := 0; | |
5741 | while L2 < S2'Last loop | |
5742 | L2 := L2 + 1; | |
5743 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
5744 | end loop; | |
5745 | ||
5746 | return N1 > N2; | |
5747 | end if; | |
5748 | end Subprogram_Name_Greater; | |
5749 | ||
5750 | -- Start of processing for Check_Subprogram_Order | |
5751 | ||
5752 | begin | |
5753 | -- Check body in alpha order if this is option | |
5754 | ||
fbf5a39b | 5755 | if Style_Check |
bc202b70 | 5756 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
5757 | and then Nkind (N) = N_Subprogram_Body |
5758 | and then Comes_From_Source (N) | |
5759 | and then In_Extended_Main_Source_Unit (N) | |
5760 | then | |
5761 | declare | |
5762 | LSN : String_Ptr | |
5763 | renames Scope_Stack.Table | |
5764 | (Scope_Stack.Last).Last_Subprogram_Name; | |
5765 | ||
5766 | Body_Id : constant Entity_Id := | |
5767 | Defining_Entity (Specification (N)); | |
5768 | ||
5769 | begin | |
5770 | Get_Decoded_Name_String (Chars (Body_Id)); | |
5771 | ||
5772 | if LSN /= null then | |
5773 | if Subprogram_Name_Greater | |
5774 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
5775 | then | |
5776 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
5777 | end if; | |
5778 | ||
5779 | Free (LSN); | |
5780 | end if; | |
5781 | ||
5782 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
5783 | end; | |
5784 | end if; | |
5785 | end Check_Subprogram_Order; | |
5786 | ||
5787 | ------------------------------ | |
5788 | -- Check_Subtype_Conformant -- | |
5789 | ------------------------------ | |
5790 | ||
5791 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
5792 | (New_Id : Entity_Id; |
5793 | Old_Id : Entity_Id; | |
5794 | Err_Loc : Node_Id := Empty; | |
5795 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 RK |
5796 | is |
5797 | Result : Boolean; | |
81db9d77 | 5798 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5799 | begin |
5800 | Check_Conformance | |
ce2b6ba5 JM |
5801 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
5802 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
5803 | end Check_Subtype_Conformant; |
5804 | ||
5805 | --------------------------- | |
5806 | -- Check_Type_Conformant -- | |
5807 | --------------------------- | |
5808 | ||
5809 | procedure Check_Type_Conformant | |
5810 | (New_Id : Entity_Id; | |
5811 | Old_Id : Entity_Id; | |
5812 | Err_Loc : Node_Id := Empty) | |
5813 | is | |
5814 | Result : Boolean; | |
81db9d77 | 5815 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5816 | begin |
5817 | Check_Conformance | |
5818 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
5819 | end Check_Type_Conformant; | |
5820 | ||
806f6d37 AC |
5821 | --------------------------- |
5822 | -- Can_Override_Operator -- | |
5823 | --------------------------- | |
5824 | ||
5825 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
5826 | Typ : Entity_Id; | |
5827 | begin | |
5828 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
5829 | return False; | |
5830 | ||
5831 | else | |
5832 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
5833 | ||
5834 | return Operator_Matches_Spec (Subp, Subp) | |
5835 | and then Scope (Subp) = Scope (Typ) | |
5836 | and then not Is_Class_Wide_Type (Typ); | |
5837 | end if; | |
5838 | end Can_Override_Operator; | |
5839 | ||
996ae0b0 RK |
5840 | ---------------------- |
5841 | -- Conforming_Types -- | |
5842 | ---------------------- | |
5843 | ||
5844 | function Conforming_Types | |
5845 | (T1 : Entity_Id; | |
5846 | T2 : Entity_Id; | |
5847 | Ctype : Conformance_Type; | |
d05ef0ab | 5848 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
5849 | is |
5850 | Type_1 : Entity_Id := T1; | |
5851 | Type_2 : Entity_Id := T2; | |
af4b9434 | 5852 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
5853 | |
5854 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
5855 | -- If neither T1 nor T2 are generic actual types, or if they are in |
5856 | -- different scopes (e.g. parent and child instances), then verify that | |
5857 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
5858 | -- subtype chain. The whole purpose of this procedure is to prevent | |
5859 | -- spurious ambiguities in an instantiation that may arise if two | |
5860 | -- distinct generic types are instantiated with the same actual. | |
5861 | ||
5d37ba92 ES |
5862 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
5863 | -- An access parameter can designate an incomplete type. If the | |
5864 | -- incomplete type is the limited view of a type from a limited_ | |
5865 | -- with_clause, check whether the non-limited view is available. If | |
5866 | -- it is a (non-limited) incomplete type, get the full view. | |
5867 | ||
0a36105d JM |
5868 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
5869 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
5870 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
5871 | -- with view of a type is used in a subprogram declaration and the | |
5872 | -- subprogram body is in the scope of a regular with clause for the | |
5873 | -- same unit. In such a case, the two type entities can be considered | |
5874 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
5875 | |
5876 | ---------------------- | |
5877 | -- Base_Types_Match -- | |
5878 | ---------------------- | |
5879 | ||
5880 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
5881 | begin | |
5882 | if T1 = T2 then | |
5883 | return True; | |
5884 | ||
5885 | elsif Base_Type (T1) = Base_Type (T2) then | |
5886 | ||
0a36105d | 5887 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
5888 | -- check that the generic actual is an ancestor subtype of the |
5889 | -- other ???. | |
5890 | ||
5891 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
5892 | or else not Is_Generic_Actual_Type (T2) |
5893 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 5894 | |
0a36105d JM |
5895 | else |
5896 | return False; | |
5897 | end if; | |
5898 | end Base_Types_Match; | |
aa720a54 | 5899 | |
5d37ba92 ES |
5900 | -------------------------- |
5901 | -- Find_Designated_Type -- | |
5902 | -------------------------- | |
5903 | ||
5904 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
5905 | Desig : Entity_Id; | |
5906 | ||
5907 | begin | |
5908 | Desig := Directly_Designated_Type (T); | |
5909 | ||
5910 | if Ekind (Desig) = E_Incomplete_Type then | |
5911 | ||
5912 | -- If regular incomplete type, get full view if available | |
5913 | ||
5914 | if Present (Full_View (Desig)) then | |
5915 | Desig := Full_View (Desig); | |
5916 | ||
5917 | -- If limited view of a type, get non-limited view if available, | |
5918 | -- and check again for a regular incomplete type. | |
5919 | ||
5920 | elsif Present (Non_Limited_View (Desig)) then | |
5921 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
5922 | end if; | |
5923 | end if; | |
5924 | ||
5925 | return Desig; | |
5926 | end Find_Designated_Type; | |
5927 | ||
0a36105d JM |
5928 | ------------------------------- |
5929 | -- Matches_Limited_With_View -- | |
5930 | ------------------------------- | |
5931 | ||
5932 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
5933 | begin | |
5934 | -- In some cases a type imported through a limited_with clause, and | |
5935 | -- its nonlimited view are both visible, for example in an anonymous | |
5936 | -- access-to-class-wide type in a formal. Both entities designate the | |
5937 | -- same type. | |
5938 | ||
5939 | if From_With_Type (T1) | |
5940 | and then T2 = Available_View (T1) | |
aa720a54 AC |
5941 | then |
5942 | return True; | |
5943 | ||
41251c60 | 5944 | elsif From_With_Type (T2) |
0a36105d | 5945 | and then T1 = Available_View (T2) |
41251c60 JM |
5946 | then |
5947 | return True; | |
3e24afaa AC |
5948 | |
5949 | elsif From_With_Type (T1) | |
5950 | and then From_With_Type (T2) | |
5951 | and then Available_View (T1) = Available_View (T2) | |
5952 | then | |
5953 | return True; | |
41251c60 | 5954 | |
996ae0b0 RK |
5955 | else |
5956 | return False; | |
5957 | end if; | |
0a36105d | 5958 | end Matches_Limited_With_View; |
996ae0b0 | 5959 | |
ec4867fa | 5960 | -- Start of processing for Conforming_Types |
758c442c | 5961 | |
996ae0b0 RK |
5962 | begin |
5963 | -- The context is an instance association for a formal | |
82c80734 RD |
5964 | -- access-to-subprogram type; the formal parameter types require |
5965 | -- mapping because they may denote other formal parameters of the | |
5966 | -- generic unit. | |
996ae0b0 RK |
5967 | |
5968 | if Get_Inst then | |
5969 | Type_1 := Get_Instance_Of (T1); | |
5970 | Type_2 := Get_Instance_Of (T2); | |
5971 | end if; | |
5972 | ||
0a36105d JM |
5973 | -- If one of the types is a view of the other introduced by a limited |
5974 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 5975 | |
0a36105d JM |
5976 | if Matches_Limited_With_View (T1, T2) then |
5977 | return True; | |
5978 | ||
5979 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
5980 | return Ctype <= Mode_Conformant |
5981 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
5982 | ||
5983 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
5984 | and then Present (Full_View (Type_1)) | |
5985 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
5986 | then | |
5987 | return Ctype <= Mode_Conformant | |
5988 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
5989 | ||
5990 | elsif Ekind (Type_2) = E_Incomplete_Type | |
5991 | and then Present (Full_View (Type_2)) | |
5992 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
5993 | then | |
5994 | return Ctype <= Mode_Conformant | |
5995 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
5996 | |
5997 | elsif Is_Private_Type (Type_2) | |
5998 | and then In_Instance | |
5999 | and then Present (Full_View (Type_2)) | |
6000 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6001 | then | |
6002 | return Ctype <= Mode_Conformant | |
6003 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
996ae0b0 RK |
6004 | end if; |
6005 | ||
0a36105d | 6006 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
758c442c | 6007 | -- treated recursively because they carry a signature. |
af4b9434 AC |
6008 | |
6009 | Are_Anonymous_Access_To_Subprogram_Types := | |
f937473f RD |
6010 | Ekind (Type_1) = Ekind (Type_2) |
6011 | and then | |
800621e0 | 6012 | (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type |
f937473f RD |
6013 | or else |
6014 | Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 6015 | |
996ae0b0 | 6016 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
6017 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
6018 | -- the base types because we may have built internal subtype entities | |
6019 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 6020 | |
5d37ba92 ES |
6021 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
6022 | and then | |
6023 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
0ab80019 | 6024 | or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254) |
996ae0b0 RK |
6025 | then |
6026 | declare | |
6027 | Desig_1 : Entity_Id; | |
6028 | Desig_2 : Entity_Id; | |
6029 | ||
6030 | begin | |
5d37ba92 ES |
6031 | -- In Ada2005, access constant indicators must match for |
6032 | -- subtype conformance. | |
9dcb52e1 | 6033 | |
0791fbe9 | 6034 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
6035 | and then Ctype >= Subtype_Conformant |
6036 | and then | |
6037 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
6038 | then | |
6039 | return False; | |
996ae0b0 RK |
6040 | end if; |
6041 | ||
5d37ba92 | 6042 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 6043 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 6044 | |
5d37ba92 | 6045 | -- If the context is an instance association for a formal |
82c80734 RD |
6046 | -- access-to-subprogram type; formal access parameter designated |
6047 | -- types require mapping because they may denote other formal | |
6048 | -- parameters of the generic unit. | |
996ae0b0 RK |
6049 | |
6050 | if Get_Inst then | |
6051 | Desig_1 := Get_Instance_Of (Desig_1); | |
6052 | Desig_2 := Get_Instance_Of (Desig_2); | |
6053 | end if; | |
6054 | ||
82c80734 RD |
6055 | -- It is possible for a Class_Wide_Type to be introduced for an |
6056 | -- incomplete type, in which case there is a separate class_ wide | |
6057 | -- type for the full view. The types conform if their Etypes | |
6058 | -- conform, i.e. one may be the full view of the other. This can | |
6059 | -- only happen in the context of an access parameter, other uses | |
6060 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 6061 | |
fbf5a39b | 6062 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
6063 | and then |
6064 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
6065 | then |
6066 | return | |
fbf5a39b AC |
6067 | Conforming_Types |
6068 | (Etype (Base_Type (Desig_1)), | |
6069 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
6070 | |
6071 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 6072 | if Ada_Version < Ada_2005 then |
758c442c GD |
6073 | return Ctype = Type_Conformant |
6074 | or else | |
af4b9434 AC |
6075 | Subtypes_Statically_Match (Desig_1, Desig_2); |
6076 | ||
758c442c GD |
6077 | -- We must check the conformance of the signatures themselves |
6078 | ||
6079 | else | |
6080 | declare | |
6081 | Conformant : Boolean; | |
6082 | begin | |
6083 | Check_Conformance | |
6084 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
6085 | return Conformant; | |
6086 | end; | |
6087 | end if; | |
6088 | ||
996ae0b0 RK |
6089 | else |
6090 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
6091 | and then (Ctype = Type_Conformant | |
af4b9434 AC |
6092 | or else |
6093 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
6094 | end if; |
6095 | end; | |
6096 | ||
6097 | -- Otherwise definitely no match | |
6098 | ||
6099 | else | |
c8ef728f ES |
6100 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
6101 | and then Is_Access_Type (Type_2)) | |
6102 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
6103 | and then Is_Access_Type (Type_1))) | |
6104 | and then | |
6105 | Conforming_Types | |
6106 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
6107 | then | |
6108 | May_Hide_Profile := True; | |
6109 | end if; | |
6110 | ||
996ae0b0 RK |
6111 | return False; |
6112 | end if; | |
996ae0b0 RK |
6113 | end Conforming_Types; |
6114 | ||
6115 | -------------------------- | |
6116 | -- Create_Extra_Formals -- | |
6117 | -------------------------- | |
6118 | ||
6119 | procedure Create_Extra_Formals (E : Entity_Id) is | |
6120 | Formal : Entity_Id; | |
ec4867fa | 6121 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
6122 | Last_Extra : Entity_Id; |
6123 | Formal_Type : Entity_Id; | |
6124 | P_Formal : Entity_Id := Empty; | |
6125 | ||
ec4867fa ES |
6126 | function Add_Extra_Formal |
6127 | (Assoc_Entity : Entity_Id; | |
6128 | Typ : Entity_Id; | |
6129 | Scope : Entity_Id; | |
6130 | Suffix : String) return Entity_Id; | |
6131 | -- Add an extra formal to the current list of formals and extra formals. | |
6132 | -- The extra formal is added to the end of the list of extra formals, | |
6133 | -- and also returned as the result. These formals are always of mode IN. | |
6134 | -- The new formal has the type Typ, is declared in Scope, and its name | |
6135 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
6136 | -- The following suffixes are currently used. They should not be changed |
6137 | -- without coordinating with CodePeer, which makes use of these to | |
6138 | -- provide better messages. | |
6139 | ||
d92eccc3 AC |
6140 | -- O denotes the Constrained bit. |
6141 | -- L denotes the accessibility level. | |
cd5a9750 AC |
6142 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
6143 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 6144 | |
fbf5a39b AC |
6145 | ---------------------- |
6146 | -- Add_Extra_Formal -- | |
6147 | ---------------------- | |
6148 | ||
ec4867fa ES |
6149 | function Add_Extra_Formal |
6150 | (Assoc_Entity : Entity_Id; | |
6151 | Typ : Entity_Id; | |
6152 | Scope : Entity_Id; | |
6153 | Suffix : String) return Entity_Id | |
6154 | is | |
996ae0b0 | 6155 | EF : constant Entity_Id := |
ec4867fa ES |
6156 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
6157 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 6158 | Suffix => Suffix)); |
996ae0b0 RK |
6159 | |
6160 | begin | |
82c80734 RD |
6161 | -- A little optimization. Never generate an extra formal for the |
6162 | -- _init operand of an initialization procedure, since it could | |
6163 | -- never be used. | |
996ae0b0 RK |
6164 | |
6165 | if Chars (Formal) = Name_uInit then | |
6166 | return Empty; | |
6167 | end if; | |
6168 | ||
6169 | Set_Ekind (EF, E_In_Parameter); | |
6170 | Set_Actual_Subtype (EF, Typ); | |
6171 | Set_Etype (EF, Typ); | |
ec4867fa | 6172 | Set_Scope (EF, Scope); |
996ae0b0 RK |
6173 | Set_Mechanism (EF, Default_Mechanism); |
6174 | Set_Formal_Validity (EF); | |
6175 | ||
ec4867fa ES |
6176 | if No (First_Extra) then |
6177 | First_Extra := EF; | |
6178 | Set_Extra_Formals (Scope, First_Extra); | |
6179 | end if; | |
6180 | ||
6181 | if Present (Last_Extra) then | |
6182 | Set_Extra_Formal (Last_Extra, EF); | |
6183 | end if; | |
6184 | ||
996ae0b0 | 6185 | Last_Extra := EF; |
ec4867fa | 6186 | |
996ae0b0 RK |
6187 | return EF; |
6188 | end Add_Extra_Formal; | |
6189 | ||
6190 | -- Start of processing for Create_Extra_Formals | |
6191 | ||
6192 | begin | |
f937473f RD |
6193 | -- We never generate extra formals if expansion is not active |
6194 | -- because we don't need them unless we are generating code. | |
6195 | ||
6196 | if not Expander_Active then | |
6197 | return; | |
6198 | end if; | |
6199 | ||
82c80734 | 6200 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 6201 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 6202 | -- for extra formals. |
996ae0b0 RK |
6203 | |
6204 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
6205 | P_Formal := First_Formal (Alias (E)); | |
6206 | end if; | |
6207 | ||
6208 | Last_Extra := Empty; | |
6209 | Formal := First_Formal (E); | |
6210 | while Present (Formal) loop | |
6211 | Last_Extra := Formal; | |
6212 | Next_Formal (Formal); | |
6213 | end loop; | |
6214 | ||
f937473f | 6215 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
6216 | -- situation may arise for subprogram types created as part of |
6217 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 RK |
6218 | |
6219 | if Present (Last_Extra) and then | |
6220 | Present (Extra_Formal (Last_Extra)) | |
6221 | then | |
6222 | return; | |
6223 | end if; | |
6224 | ||
19590d70 GD |
6225 | -- If the subprogram is a predefined dispatching subprogram then don't |
6226 | -- generate any extra constrained or accessibility level formals. In | |
6227 | -- general we suppress these for internal subprograms (by not calling | |
6228 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
6229 | -- generated stream attributes do get passed through because extra | |
6230 | -- build-in-place formals are needed in some cases (limited 'Input). | |
6231 | ||
bac7206d | 6232 | if Is_Predefined_Internal_Operation (E) then |
19590d70 GD |
6233 | goto Test_For_BIP_Extras; |
6234 | end if; | |
6235 | ||
996ae0b0 | 6236 | Formal := First_Formal (E); |
996ae0b0 RK |
6237 | while Present (Formal) loop |
6238 | ||
6239 | -- Create extra formal for supporting the attribute 'Constrained. | |
6240 | -- The case of a private type view without discriminants also | |
6241 | -- requires the extra formal if the underlying type has defaulted | |
6242 | -- discriminants. | |
6243 | ||
6244 | if Ekind (Formal) /= E_In_Parameter then | |
6245 | if Present (P_Formal) then | |
6246 | Formal_Type := Etype (P_Formal); | |
6247 | else | |
6248 | Formal_Type := Etype (Formal); | |
6249 | end if; | |
6250 | ||
5d09245e AC |
6251 | -- Do not produce extra formals for Unchecked_Union parameters. |
6252 | -- Jump directly to the end of the loop. | |
6253 | ||
6254 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
6255 | goto Skip_Extra_Formal_Generation; | |
6256 | end if; | |
6257 | ||
996ae0b0 RK |
6258 | if not Has_Discriminants (Formal_Type) |
6259 | and then Ekind (Formal_Type) in Private_Kind | |
6260 | and then Present (Underlying_Type (Formal_Type)) | |
6261 | then | |
6262 | Formal_Type := Underlying_Type (Formal_Type); | |
6263 | end if; | |
6264 | ||
5e5db3b4 GD |
6265 | -- Suppress the extra formal if formal's subtype is constrained or |
6266 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
6267 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
6268 | -- can have defaulted discriminants, but 'Constrained is required | |
6269 | -- to return True, so the formal is never needed (see AI05-0214). | |
6270 | -- Note that this ensures consistency of calling sequences for | |
6271 | -- dispatching operations when some types in a class have defaults | |
6272 | -- on discriminants and others do not (and requiring the extra | |
6273 | -- formal would introduce distributed overhead). | |
6274 | ||
996ae0b0 | 6275 | if Has_Discriminants (Formal_Type) |
f937473f RD |
6276 | and then not Is_Constrained (Formal_Type) |
6277 | and then not Is_Indefinite_Subtype (Formal_Type) | |
5e5db3b4 GD |
6278 | and then (Ada_Version < Ada_2012 |
6279 | or else | |
6280 | not (Is_Tagged_Type (Underlying_Type (Formal_Type)) | |
6281 | and then Is_Limited_Type (Formal_Type))) | |
996ae0b0 RK |
6282 | then |
6283 | Set_Extra_Constrained | |
d92eccc3 | 6284 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
6285 | end if; |
6286 | end if; | |
6287 | ||
0a36105d JM |
6288 | -- Create extra formal for supporting accessibility checking. This |
6289 | -- is done for both anonymous access formals and formals of named | |
6290 | -- access types that are marked as controlling formals. The latter | |
6291 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
6292 | -- type and substitutes the types of access-to-class-wide actuals | |
6293 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
6294 | -- Base_Type is applied because in cases where there is a null |
6295 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
6296 | |
6297 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 6298 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
6299 | -- package in which it resides. However, we do not suppress it |
6300 | -- simply if the scope has accessibility checks suppressed, since | |
6301 | -- this could cause trouble when clients are compiled with a | |
6302 | -- different suppression setting. The explicit checks at the | |
6303 | -- package level are safe from this point of view. | |
996ae0b0 | 6304 | |
5d37ba92 | 6305 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 6306 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 6307 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 6308 | and then not |
fbf5a39b | 6309 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 6310 | or else |
fbf5a39b | 6311 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 6312 | and then |
c8ef728f | 6313 | (No (P_Formal) |
996ae0b0 RK |
6314 | or else Present (Extra_Accessibility (P_Formal))) |
6315 | then | |
811c6a85 | 6316 | Set_Extra_Accessibility |
d92eccc3 | 6317 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
6318 | end if; |
6319 | ||
5d09245e AC |
6320 | -- This label is required when skipping extra formal generation for |
6321 | -- Unchecked_Union parameters. | |
6322 | ||
6323 | <<Skip_Extra_Formal_Generation>> | |
6324 | ||
f937473f RD |
6325 | if Present (P_Formal) then |
6326 | Next_Formal (P_Formal); | |
6327 | end if; | |
6328 | ||
996ae0b0 RK |
6329 | Next_Formal (Formal); |
6330 | end loop; | |
ec4867fa | 6331 | |
19590d70 GD |
6332 | <<Test_For_BIP_Extras>> |
6333 | ||
ec4867fa | 6334 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
6335 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
6336 | ||
0791fbe9 | 6337 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 6338 | declare |
f937473f RD |
6339 | Result_Subt : constant Entity_Id := Etype (E); |
6340 | ||
6341 | Discard : Entity_Id; | |
6342 | pragma Warnings (Off, Discard); | |
ec4867fa ES |
6343 | |
6344 | begin | |
f937473f | 6345 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
6346 | -- add a 4-state formal indicating whether the return object is |
6347 | -- allocated by the caller (1), or should be allocated by the | |
6348 | -- callee on the secondary stack (2), in the global heap (3), or | |
6349 | -- in a user-defined storage pool (4). For the moment we just use | |
6350 | -- Natural for the type of this formal. Note that this formal | |
6351 | -- isn't usually needed in the case where the result subtype is | |
6352 | -- constrained, but it is needed when the function has a tagged | |
6353 | -- result, because generally such functions can be called in a | |
6354 | -- dispatching context and such calls must be handled like calls | |
6355 | -- to a class-wide function. | |
0a36105d | 6356 | |
1bb6e262 | 6357 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
6358 | Discard := |
6359 | Add_Extra_Formal | |
6360 | (E, Standard_Natural, | |
6361 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
6362 | end if; | |
ec4867fa | 6363 | |
df3e68b1 | 6364 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 6365 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 6366 | |
ca5af305 | 6367 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
6368 | Discard := |
6369 | Add_Extra_Formal | |
ca5af305 AC |
6370 | (E, RTE (RE_Finalization_Master_Ptr), |
6371 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
6372 | end if; |
6373 | ||
94bbf008 AC |
6374 | -- When the result type contains tasks, add two extra formals: the |
6375 | -- master of the tasks to be created, and the caller's activation | |
6376 | -- chain. | |
f937473f | 6377 | |
94bbf008 | 6378 | if Has_Task (Available_View (Result_Subt)) then |
f937473f RD |
6379 | Discard := |
6380 | Add_Extra_Formal | |
6381 | (E, RTE (RE_Master_Id), | |
6382 | E, BIP_Formal_Suffix (BIP_Master)); | |
6383 | Discard := | |
6384 | Add_Extra_Formal | |
6385 | (E, RTE (RE_Activation_Chain_Access), | |
6386 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
6387 | end if; | |
ec4867fa | 6388 | |
f937473f RD |
6389 | -- All build-in-place functions get an extra formal that will be |
6390 | -- passed the address of the return object within the caller. | |
ec4867fa | 6391 | |
f937473f RD |
6392 | declare |
6393 | Formal_Type : constant Entity_Id := | |
6394 | Create_Itype | |
6395 | (E_Anonymous_Access_Type, E, | |
6396 | Scope_Id => Scope (E)); | |
6397 | begin | |
6398 | Set_Directly_Designated_Type (Formal_Type, Result_Subt); | |
6399 | Set_Etype (Formal_Type, Formal_Type); | |
f937473f RD |
6400 | Set_Depends_On_Private |
6401 | (Formal_Type, Has_Private_Component (Formal_Type)); | |
6402 | Set_Is_Public (Formal_Type, Is_Public (Scope (Formal_Type))); | |
6403 | Set_Is_Access_Constant (Formal_Type, False); | |
ec4867fa | 6404 | |
f937473f RD |
6405 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
6406 | -- the designated type comes from the limited view (for | |
6407 | -- back-end purposes). | |
ec4867fa | 6408 | |
f937473f | 6409 | Set_From_With_Type (Formal_Type, From_With_Type (Result_Subt)); |
ec4867fa | 6410 | |
f937473f RD |
6411 | Layout_Type (Formal_Type); |
6412 | ||
6413 | Discard := | |
6414 | Add_Extra_Formal | |
6415 | (E, Formal_Type, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
6416 | end; | |
ec4867fa ES |
6417 | end; |
6418 | end if; | |
996ae0b0 RK |
6419 | end Create_Extra_Formals; |
6420 | ||
6421 | ----------------------------- | |
6422 | -- Enter_Overloaded_Entity -- | |
6423 | ----------------------------- | |
6424 | ||
6425 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
6426 | E : Entity_Id := Current_Entity_In_Scope (S); | |
6427 | C_E : Entity_Id := Current_Entity (S); | |
6428 | ||
6429 | begin | |
6430 | if Present (E) then | |
6431 | Set_Has_Homonym (E); | |
6432 | Set_Has_Homonym (S); | |
6433 | end if; | |
6434 | ||
6435 | Set_Is_Immediately_Visible (S); | |
6436 | Set_Scope (S, Current_Scope); | |
6437 | ||
6438 | -- Chain new entity if front of homonym in current scope, so that | |
6439 | -- homonyms are contiguous. | |
6440 | ||
6441 | if Present (E) | |
6442 | and then E /= C_E | |
6443 | then | |
6444 | while Homonym (C_E) /= E loop | |
6445 | C_E := Homonym (C_E); | |
6446 | end loop; | |
6447 | ||
6448 | Set_Homonym (C_E, S); | |
6449 | ||
6450 | else | |
6451 | E := C_E; | |
6452 | Set_Current_Entity (S); | |
6453 | end if; | |
6454 | ||
6455 | Set_Homonym (S, E); | |
6456 | ||
6457 | Append_Entity (S, Current_Scope); | |
6458 | Set_Public_Status (S); | |
6459 | ||
6460 | if Debug_Flag_E then | |
6461 | Write_Str ("New overloaded entity chain: "); | |
6462 | Write_Name (Chars (S)); | |
996ae0b0 | 6463 | |
82c80734 | 6464 | E := S; |
996ae0b0 RK |
6465 | while Present (E) loop |
6466 | Write_Str (" "); Write_Int (Int (E)); | |
6467 | E := Homonym (E); | |
6468 | end loop; | |
6469 | ||
6470 | Write_Eol; | |
6471 | end if; | |
6472 | ||
6473 | -- Generate warning for hiding | |
6474 | ||
6475 | if Warn_On_Hiding | |
6476 | and then Comes_From_Source (S) | |
6477 | and then In_Extended_Main_Source_Unit (S) | |
6478 | then | |
6479 | E := S; | |
6480 | loop | |
6481 | E := Homonym (E); | |
6482 | exit when No (E); | |
6483 | ||
7fc53871 AC |
6484 | -- Warn unless genuine overloading. Do not emit warning on |
6485 | -- hiding predefined operators in Standard (these are either an | |
6486 | -- (artifact of our implicit declarations, or simple noise) but | |
6487 | -- keep warning on a operator defined on a local subtype, because | |
6488 | -- of the real danger that different operators may be applied in | |
6489 | -- various parts of the program. | |
996ae0b0 | 6490 | |
1f250383 AC |
6491 | -- Note that if E and S have the same scope, there is never any |
6492 | -- hiding. Either the two conflict, and the program is illegal, | |
6493 | -- or S is overriding an implicit inherited subprogram. | |
6494 | ||
6495 | if Scope (E) /= Scope (S) | |
6496 | and then (not Is_Overloadable (E) | |
8d606a78 | 6497 | or else Subtype_Conformant (E, S)) |
f937473f RD |
6498 | and then (Is_Immediately_Visible (E) |
6499 | or else | |
6500 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 6501 | then |
7fc53871 AC |
6502 | if Scope (E) /= Standard_Standard then |
6503 | Error_Msg_Sloc := Sloc (E); | |
6504 | Error_Msg_N ("declaration of & hides one#?", S); | |
6505 | ||
6506 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
6507 | and then | |
1f250383 | 6508 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
6509 | then |
6510 | Error_Msg_N | |
6511 | ("declaration of & hides predefined operator?", S); | |
6512 | end if; | |
996ae0b0 RK |
6513 | end if; |
6514 | end loop; | |
6515 | end if; | |
6516 | end Enter_Overloaded_Entity; | |
6517 | ||
e5a58fac AC |
6518 | ----------------------------- |
6519 | -- Check_Untagged_Equality -- | |
6520 | ----------------------------- | |
6521 | ||
6522 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
6523 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
6524 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
6525 | Obj_Decl : Node_Id; | |
6526 | ||
6527 | begin | |
6528 | if Nkind (Decl) = N_Subprogram_Declaration | |
6529 | and then Is_Record_Type (Typ) | |
6530 | and then not Is_Tagged_Type (Typ) | |
6531 | then | |
21a5b575 AC |
6532 | -- If the type is not declared in a package, or if we are in the |
6533 | -- body of the package or in some other scope, the new operation is | |
6534 | -- not primitive, and therefore legal, though suspicious. If the | |
6535 | -- type is a generic actual (sub)type, the operation is not primitive | |
6536 | -- either because the base type is declared elsewhere. | |
6537 | ||
e5a58fac | 6538 | if Is_Frozen (Typ) then |
21a5b575 AC |
6539 | if Ekind (Scope (Typ)) /= E_Package |
6540 | or else Scope (Typ) /= Current_Scope | |
6541 | then | |
6542 | null; | |
e5a58fac | 6543 | |
21a5b575 AC |
6544 | elsif Is_Generic_Actual_Type (Typ) then |
6545 | null; | |
e5a58fac | 6546 | |
21a5b575 | 6547 | elsif In_Package_Body (Scope (Typ)) then |
ae6ede77 AC |
6548 | Error_Msg_NE |
6549 | ("equality operator must be declared " | |
6550 | & "before type& is frozen", Eq_Op, Typ); | |
6551 | Error_Msg_N | |
6552 | ("\move declaration to package spec", Eq_Op); | |
21a5b575 AC |
6553 | |
6554 | else | |
6555 | Error_Msg_NE | |
6556 | ("equality operator must be declared " | |
6557 | & "before type& is frozen", Eq_Op, Typ); | |
6558 | ||
6559 | Obj_Decl := Next (Parent (Typ)); | |
6560 | while Present (Obj_Decl) | |
6561 | and then Obj_Decl /= Decl | |
6562 | loop | |
6563 | if Nkind (Obj_Decl) = N_Object_Declaration | |
6564 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
6565 | then | |
6566 | Error_Msg_NE ("type& is frozen by declaration?", | |
6567 | Obj_Decl, Typ); | |
6568 | Error_Msg_N | |
6569 | ("\an equality operator cannot be declared after this " | |
a4640a39 | 6570 | & "point (RM 4.5.2 (9.8)) (Ada 2012))?", Obj_Decl); |
21a5b575 AC |
6571 | exit; |
6572 | end if; | |
6573 | ||
6574 | Next (Obj_Decl); | |
6575 | end loop; | |
6576 | end if; | |
e5a58fac AC |
6577 | |
6578 | elsif not In_Same_List (Parent (Typ), Decl) | |
6579 | and then not Is_Limited_Type (Typ) | |
6580 | then | |
21a5b575 AC |
6581 | |
6582 | -- This makes it illegal to have a primitive equality declared in | |
6583 | -- the private part if the type is visible. | |
6584 | ||
e5a58fac AC |
6585 | Error_Msg_N ("equality operator appears too late", Eq_Op); |
6586 | end if; | |
6587 | end if; | |
6588 | end Check_Untagged_Equality; | |
6589 | ||
996ae0b0 RK |
6590 | ----------------------------- |
6591 | -- Find_Corresponding_Spec -- | |
6592 | ----------------------------- | |
6593 | ||
d44202ba HK |
6594 | function Find_Corresponding_Spec |
6595 | (N : Node_Id; | |
6596 | Post_Error : Boolean := True) return Entity_Id | |
6597 | is | |
996ae0b0 RK |
6598 | Spec : constant Node_Id := Specification (N); |
6599 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
6600 | ||
6601 | E : Entity_Id; | |
6602 | ||
6603 | begin | |
6604 | E := Current_Entity (Designator); | |
996ae0b0 RK |
6605 | while Present (E) loop |
6606 | ||
6607 | -- We are looking for a matching spec. It must have the same scope, | |
6608 | -- and the same name, and either be type conformant, or be the case | |
6609 | -- of a library procedure spec and its body (which belong to one | |
6610 | -- another regardless of whether they are type conformant or not). | |
6611 | ||
6612 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
6613 | if Current_Scope = Standard_Standard |
6614 | or else (Ekind (E) = Ekind (Designator) | |
6615 | and then Type_Conformant (E, Designator)) | |
996ae0b0 RK |
6616 | then |
6617 | -- Within an instantiation, we know that spec and body are | |
6618 | -- subtype conformant, because they were subtype conformant | |
6619 | -- in the generic. We choose the subtype-conformant entity | |
6620 | -- here as well, to resolve spurious ambiguities in the | |
6621 | -- instance that were not present in the generic (i.e. when | |
6622 | -- two different types are given the same actual). If we are | |
6623 | -- looking for a spec to match a body, full conformance is | |
6624 | -- expected. | |
6625 | ||
6626 | if In_Instance then | |
6627 | Set_Convention (Designator, Convention (E)); | |
6628 | ||
0187b60e AC |
6629 | -- Skip past subprogram bodies and subprogram renamings that |
6630 | -- may appear to have a matching spec, but that aren't fully | |
6631 | -- conformant with it. That can occur in cases where an | |
6632 | -- actual type causes unrelated homographs in the instance. | |
6633 | ||
6634 | if Nkind_In (N, N_Subprogram_Body, | |
6635 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 6636 | and then Present (Homonym (E)) |
c7b9d548 | 6637 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
6638 | then |
6639 | goto Next_Entity; | |
6640 | ||
c7b9d548 | 6641 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 RK |
6642 | goto Next_Entity; |
6643 | end if; | |
6644 | end if; | |
6645 | ||
25ebc085 AC |
6646 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
6647 | -- null procedures locate the internally generated spec. We | |
6648 | -- enforce mode conformance since a tagged type may inherit | |
6649 | -- from interfaces several null primitives which differ only | |
6650 | -- in the mode of the formals. | |
6651 | ||
6652 | if not (Comes_From_Source (E)) | |
6653 | and then Is_Null_Procedure (E) | |
6654 | and then not Mode_Conformant (Designator, E) | |
6655 | then | |
6656 | null; | |
6657 | ||
6658 | elsif not Has_Completion (E) then | |
996ae0b0 RK |
6659 | if Nkind (N) /= N_Subprogram_Body_Stub then |
6660 | Set_Corresponding_Spec (N, E); | |
6661 | end if; | |
6662 | ||
6663 | Set_Has_Completion (E); | |
6664 | return E; | |
6665 | ||
6666 | elsif Nkind (Parent (N)) = N_Subunit then | |
6667 | ||
6668 | -- If this is the proper body of a subunit, the completion | |
6669 | -- flag is set when analyzing the stub. | |
6670 | ||
6671 | return E; | |
6672 | ||
81db9d77 ES |
6673 | -- If E is an internal function with a controlling result |
6674 | -- that was created for an operation inherited by a null | |
6675 | -- extension, it may be overridden by a body without a previous | |
6676 | -- spec (one more reason why these should be shunned). In that | |
1366997b AC |
6677 | -- case remove the generated body if present, because the |
6678 | -- current one is the explicit overriding. | |
81db9d77 ES |
6679 | |
6680 | elsif Ekind (E) = E_Function | |
0791fbe9 | 6681 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
6682 | and then not Comes_From_Source (E) |
6683 | and then Has_Controlling_Result (E) | |
6684 | and then Is_Null_Extension (Etype (E)) | |
6685 | and then Comes_From_Source (Spec) | |
6686 | then | |
6687 | Set_Has_Completion (E, False); | |
6688 | ||
1366997b AC |
6689 | if Expander_Active |
6690 | and then Nkind (Parent (E)) = N_Function_Specification | |
6691 | then | |
81db9d77 ES |
6692 | Remove |
6693 | (Unit_Declaration_Node | |
1366997b AC |
6694 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
6695 | ||
81db9d77 ES |
6696 | return E; |
6697 | ||
1366997b AC |
6698 | -- If expansion is disabled, or if the wrapper function has |
6699 | -- not been generated yet, this a late body overriding an | |
6700 | -- inherited operation, or it is an overriding by some other | |
6701 | -- declaration before the controlling result is frozen. In | |
6702 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
6703 | |
6704 | else | |
6705 | return Empty; | |
6706 | end if; | |
6707 | ||
d44202ba HK |
6708 | -- If the body already exists, then this is an error unless |
6709 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
6710 | -- derived subprogram. It is also legal for an instance to |
6711 | -- contain type conformant overloadable declarations (but the | |
6712 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
6713 | |
6714 | elsif No (Alias (E)) | |
6715 | and then not Is_Intrinsic_Subprogram (E) | |
6716 | and then not In_Instance | |
d44202ba | 6717 | and then Post_Error |
996ae0b0 RK |
6718 | then |
6719 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 6720 | |
07fc65c4 GB |
6721 | if Is_Imported (E) then |
6722 | Error_Msg_NE | |
6723 | ("body not allowed for imported subprogram & declared#", | |
6724 | N, E); | |
6725 | else | |
6726 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
6727 | end if; | |
996ae0b0 RK |
6728 | end if; |
6729 | ||
d44202ba HK |
6730 | -- Child units cannot be overloaded, so a conformance mismatch |
6731 | -- between body and a previous spec is an error. | |
6732 | ||
996ae0b0 RK |
6733 | elsif Is_Child_Unit (E) |
6734 | and then | |
6735 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
6736 | and then | |
5d37ba92 | 6737 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
6738 | N_Compilation_Unit |
6739 | and then Post_Error | |
996ae0b0 | 6740 | then |
996ae0b0 RK |
6741 | Error_Msg_N |
6742 | ("body of child unit does not match previous declaration", N); | |
6743 | end if; | |
6744 | end if; | |
6745 | ||
6746 | <<Next_Entity>> | |
6747 | E := Homonym (E); | |
6748 | end loop; | |
6749 | ||
6750 | -- On exit, we know that no previous declaration of subprogram exists | |
6751 | ||
6752 | return Empty; | |
6753 | end Find_Corresponding_Spec; | |
6754 | ||
6755 | ---------------------- | |
6756 | -- Fully_Conformant -- | |
6757 | ---------------------- | |
6758 | ||
6759 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
6760 | Result : Boolean; | |
996ae0b0 RK |
6761 | begin |
6762 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
6763 | return Result; | |
6764 | end Fully_Conformant; | |
6765 | ||
6766 | ---------------------------------- | |
6767 | -- Fully_Conformant_Expressions -- | |
6768 | ---------------------------------- | |
6769 | ||
6770 | function Fully_Conformant_Expressions | |
6771 | (Given_E1 : Node_Id; | |
d05ef0ab | 6772 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
6773 | is |
6774 | E1 : constant Node_Id := Original_Node (Given_E1); | |
6775 | E2 : constant Node_Id := Original_Node (Given_E2); | |
6776 | -- We always test conformance on original nodes, since it is possible | |
6777 | -- for analysis and/or expansion to make things look as though they | |
6778 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
6779 | ||
6780 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
6781 | renames Fully_Conformant_Expressions; | |
6782 | ||
6783 | function FCL (L1, L2 : List_Id) return Boolean; | |
6784 | -- Compare elements of two lists for conformance. Elements have to | |
6785 | -- be conformant, and actuals inserted as default parameters do not | |
6786 | -- match explicit actuals with the same value. | |
6787 | ||
6788 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 6789 | -- Compare an operator node with a function call |
996ae0b0 RK |
6790 | |
6791 | --------- | |
6792 | -- FCL -- | |
6793 | --------- | |
6794 | ||
6795 | function FCL (L1, L2 : List_Id) return Boolean is | |
6796 | N1, N2 : Node_Id; | |
6797 | ||
6798 | begin | |
6799 | if L1 = No_List then | |
6800 | N1 := Empty; | |
6801 | else | |
6802 | N1 := First (L1); | |
6803 | end if; | |
6804 | ||
6805 | if L2 = No_List then | |
6806 | N2 := Empty; | |
6807 | else | |
6808 | N2 := First (L2); | |
6809 | end if; | |
6810 | ||
6811 | -- Compare two lists, skipping rewrite insertions (we want to | |
6812 | -- compare the original trees, not the expanded versions!) | |
6813 | ||
6814 | loop | |
6815 | if Is_Rewrite_Insertion (N1) then | |
6816 | Next (N1); | |
6817 | elsif Is_Rewrite_Insertion (N2) then | |
6818 | Next (N2); | |
6819 | elsif No (N1) then | |
6820 | return No (N2); | |
6821 | elsif No (N2) then | |
6822 | return False; | |
6823 | elsif not FCE (N1, N2) then | |
6824 | return False; | |
6825 | else | |
6826 | Next (N1); | |
6827 | Next (N2); | |
6828 | end if; | |
6829 | end loop; | |
6830 | end FCL; | |
6831 | ||
6832 | --------- | |
6833 | -- FCO -- | |
6834 | --------- | |
6835 | ||
6836 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
6837 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
6838 | Act : Node_Id; | |
6839 | ||
6840 | begin | |
6841 | if No (Actuals) | |
6842 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
6843 | then | |
6844 | return False; | |
6845 | ||
6846 | else | |
6847 | Act := First (Actuals); | |
6848 | ||
6849 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
6850 | if not FCE (Left_Opnd (Op_Node), Act) then |
6851 | return False; | |
6852 | end if; | |
6853 | ||
6854 | Next (Act); | |
6855 | end if; | |
6856 | ||
6857 | return Present (Act) | |
6858 | and then FCE (Right_Opnd (Op_Node), Act) | |
6859 | and then No (Next (Act)); | |
6860 | end if; | |
6861 | end FCO; | |
6862 | ||
6863 | -- Start of processing for Fully_Conformant_Expressions | |
6864 | ||
6865 | begin | |
6866 | -- Non-conformant if paren count does not match. Note: if some idiot | |
6867 | -- complains that we don't do this right for more than 3 levels of | |
0a36105d | 6868 | -- parentheses, they will be treated with the respect they deserve! |
996ae0b0 RK |
6869 | |
6870 | if Paren_Count (E1) /= Paren_Count (E2) then | |
6871 | return False; | |
6872 | ||
82c80734 RD |
6873 | -- If same entities are referenced, then they are conformant even if |
6874 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
6875 | |
6876 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
6877 | if Present (Entity (E1)) then | |
6878 | return Entity (E1) = Entity (E2) | |
6879 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
6880 | and then Ekind (Entity (E1)) = E_Discriminant | |
6881 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
6882 | ||
6883 | elsif Nkind (E1) = N_Expanded_Name | |
6884 | and then Nkind (E2) = N_Expanded_Name | |
6885 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
6886 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
6887 | then | |
6888 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
6889 | ||
6890 | else | |
6891 | -- Identifiers in component associations don't always have | |
6892 | -- entities, but their names must conform. | |
6893 | ||
6894 | return Nkind (E1) = N_Identifier | |
6895 | and then Nkind (E2) = N_Identifier | |
6896 | and then Chars (E1) = Chars (E2); | |
6897 | end if; | |
6898 | ||
6899 | elsif Nkind (E1) = N_Character_Literal | |
6900 | and then Nkind (E2) = N_Expanded_Name | |
6901 | then | |
6902 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
6903 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
6904 | ||
6905 | elsif Nkind (E2) = N_Character_Literal | |
6906 | and then Nkind (E1) = N_Expanded_Name | |
6907 | then | |
6908 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
6909 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
6910 | ||
6911 | elsif Nkind (E1) in N_Op | |
6912 | and then Nkind (E2) = N_Function_Call | |
6913 | then | |
6914 | return FCO (E1, E2); | |
6915 | ||
6916 | elsif Nkind (E2) in N_Op | |
6917 | and then Nkind (E1) = N_Function_Call | |
6918 | then | |
6919 | return FCO (E2, E1); | |
6920 | ||
6921 | -- Otherwise we must have the same syntactic entity | |
6922 | ||
6923 | elsif Nkind (E1) /= Nkind (E2) then | |
6924 | return False; | |
6925 | ||
6926 | -- At this point, we specialize by node type | |
6927 | ||
6928 | else | |
6929 | case Nkind (E1) is | |
6930 | ||
6931 | when N_Aggregate => | |
6932 | return | |
6933 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
6934 | and then |
6935 | FCL (Component_Associations (E1), | |
6936 | Component_Associations (E2)); | |
996ae0b0 RK |
6937 | |
6938 | when N_Allocator => | |
6939 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
6940 | or else | |
6941 | Nkind (Expression (E2)) = N_Qualified_Expression | |
6942 | then | |
6943 | return FCE (Expression (E1), Expression (E2)); | |
6944 | ||
6945 | -- Check that the subtype marks and any constraints | |
6946 | -- are conformant | |
6947 | ||
6948 | else | |
6949 | declare | |
6950 | Indic1 : constant Node_Id := Expression (E1); | |
6951 | Indic2 : constant Node_Id := Expression (E2); | |
6952 | Elt1 : Node_Id; | |
6953 | Elt2 : Node_Id; | |
6954 | ||
6955 | begin | |
6956 | if Nkind (Indic1) /= N_Subtype_Indication then | |
6957 | return | |
6958 | Nkind (Indic2) /= N_Subtype_Indication | |
6959 | and then Entity (Indic1) = Entity (Indic2); | |
6960 | ||
6961 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
6962 | return | |
6963 | Nkind (Indic1) /= N_Subtype_Indication | |
6964 | and then Entity (Indic1) = Entity (Indic2); | |
6965 | ||
6966 | else | |
6967 | if Entity (Subtype_Mark (Indic1)) /= | |
6968 | Entity (Subtype_Mark (Indic2)) | |
6969 | then | |
6970 | return False; | |
6971 | end if; | |
6972 | ||
6973 | Elt1 := First (Constraints (Constraint (Indic1))); | |
6974 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
6975 | while Present (Elt1) and then Present (Elt2) loop |
6976 | if not FCE (Elt1, Elt2) then | |
6977 | return False; | |
6978 | end if; | |
6979 | ||
6980 | Next (Elt1); | |
6981 | Next (Elt2); | |
6982 | end loop; | |
6983 | ||
6984 | return True; | |
6985 | end if; | |
6986 | end; | |
6987 | end if; | |
6988 | ||
6989 | when N_Attribute_Reference => | |
6990 | return | |
6991 | Attribute_Name (E1) = Attribute_Name (E2) | |
6992 | and then FCL (Expressions (E1), Expressions (E2)); | |
6993 | ||
6994 | when N_Binary_Op => | |
6995 | return | |
6996 | Entity (E1) = Entity (E2) | |
6997 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
6998 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
6999 | ||
514d0fc5 | 7000 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
7001 | return |
7002 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7003 | and then | |
7004 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7005 | ||
19d846a0 RD |
7006 | when N_Case_Expression => |
7007 | declare | |
7008 | Alt1 : Node_Id; | |
7009 | Alt2 : Node_Id; | |
7010 | ||
7011 | begin | |
7012 | if not FCE (Expression (E1), Expression (E2)) then | |
7013 | return False; | |
7014 | ||
7015 | else | |
7016 | Alt1 := First (Alternatives (E1)); | |
7017 | Alt2 := First (Alternatives (E2)); | |
7018 | loop | |
7019 | if Present (Alt1) /= Present (Alt2) then | |
7020 | return False; | |
7021 | elsif No (Alt1) then | |
7022 | return True; | |
7023 | end if; | |
7024 | ||
7025 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
7026 | or else not FCL (Discrete_Choices (Alt1), | |
7027 | Discrete_Choices (Alt2)) | |
7028 | then | |
7029 | return False; | |
7030 | end if; | |
7031 | ||
7032 | Next (Alt1); | |
7033 | Next (Alt2); | |
7034 | end loop; | |
7035 | end if; | |
7036 | end; | |
7037 | ||
996ae0b0 RK |
7038 | when N_Character_Literal => |
7039 | return | |
7040 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
7041 | ||
7042 | when N_Component_Association => | |
7043 | return | |
7044 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
7045 | and then |
7046 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7047 | |
7048 | when N_Conditional_Expression => | |
7049 | return | |
7050 | FCL (Expressions (E1), Expressions (E2)); | |
7051 | ||
7052 | when N_Explicit_Dereference => | |
7053 | return | |
7054 | FCE (Prefix (E1), Prefix (E2)); | |
7055 | ||
7056 | when N_Extension_Aggregate => | |
7057 | return | |
7058 | FCL (Expressions (E1), Expressions (E2)) | |
7059 | and then Null_Record_Present (E1) = | |
7060 | Null_Record_Present (E2) | |
7061 | and then FCL (Component_Associations (E1), | |
7062 | Component_Associations (E2)); | |
7063 | ||
7064 | when N_Function_Call => | |
7065 | return | |
7066 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
7067 | and then |
7068 | FCL (Parameter_Associations (E1), | |
7069 | Parameter_Associations (E2)); | |
996ae0b0 RK |
7070 | |
7071 | when N_Indexed_Component => | |
7072 | return | |
7073 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7074 | and then |
7075 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
7076 | |
7077 | when N_Integer_Literal => | |
7078 | return (Intval (E1) = Intval (E2)); | |
7079 | ||
7080 | when N_Null => | |
7081 | return True; | |
7082 | ||
7083 | when N_Operator_Symbol => | |
7084 | return | |
7085 | Chars (E1) = Chars (E2); | |
7086 | ||
7087 | when N_Others_Choice => | |
7088 | return True; | |
7089 | ||
7090 | when N_Parameter_Association => | |
7091 | return | |
996ae0b0 RK |
7092 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
7093 | and then FCE (Explicit_Actual_Parameter (E1), | |
7094 | Explicit_Actual_Parameter (E2)); | |
7095 | ||
7096 | when N_Qualified_Expression => | |
7097 | return | |
7098 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7099 | and then |
7100 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 7101 | |
2010d078 AC |
7102 | when N_Quantified_Expression => |
7103 | if not FCE (Condition (E1), Condition (E2)) then | |
7104 | return False; | |
7105 | end if; | |
7106 | ||
7107 | if Present (Loop_Parameter_Specification (E1)) | |
7108 | and then Present (Loop_Parameter_Specification (E2)) | |
7109 | then | |
7110 | declare | |
7111 | L1 : constant Node_Id := | |
7112 | Loop_Parameter_Specification (E1); | |
7113 | L2 : constant Node_Id := | |
7114 | Loop_Parameter_Specification (E2); | |
7115 | ||
7116 | begin | |
7117 | return | |
7118 | Reverse_Present (L1) = Reverse_Present (L2) | |
7119 | and then | |
7120 | FCE (Defining_Identifier (L1), | |
7121 | Defining_Identifier (L2)) | |
7122 | and then | |
7123 | FCE (Discrete_Subtype_Definition (L1), | |
7124 | Discrete_Subtype_Definition (L2)); | |
7125 | end; | |
7126 | ||
7127 | else -- quantified expression with an iterator | |
7128 | declare | |
7129 | I1 : constant Node_Id := Iterator_Specification (E1); | |
7130 | I2 : constant Node_Id := Iterator_Specification (E2); | |
7131 | ||
7132 | begin | |
7133 | return | |
7134 | FCE (Defining_Identifier (I1), | |
7135 | Defining_Identifier (I2)) | |
7136 | and then | |
7137 | Of_Present (I1) = Of_Present (I2) | |
7138 | and then | |
7139 | Reverse_Present (I1) = Reverse_Present (I2) | |
7140 | and then FCE (Name (I1), Name (I2)) | |
7141 | and then FCE (Subtype_Indication (I1), | |
7142 | Subtype_Indication (I2)); | |
7143 | end; | |
7144 | end if; | |
7145 | ||
996ae0b0 RK |
7146 | when N_Range => |
7147 | return | |
7148 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
7149 | and then |
7150 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
7151 | |
7152 | when N_Real_Literal => | |
7153 | return (Realval (E1) = Realval (E2)); | |
7154 | ||
7155 | when N_Selected_Component => | |
7156 | return | |
7157 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7158 | and then |
7159 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
7160 | |
7161 | when N_Slice => | |
7162 | return | |
7163 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7164 | and then |
7165 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
7166 | |
7167 | when N_String_Literal => | |
7168 | declare | |
7169 | S1 : constant String_Id := Strval (E1); | |
7170 | S2 : constant String_Id := Strval (E2); | |
7171 | L1 : constant Nat := String_Length (S1); | |
7172 | L2 : constant Nat := String_Length (S2); | |
7173 | ||
7174 | begin | |
7175 | if L1 /= L2 then | |
7176 | return False; | |
7177 | ||
7178 | else | |
7179 | for J in 1 .. L1 loop | |
7180 | if Get_String_Char (S1, J) /= | |
7181 | Get_String_Char (S2, J) | |
7182 | then | |
7183 | return False; | |
7184 | end if; | |
7185 | end loop; | |
7186 | ||
7187 | return True; | |
7188 | end if; | |
7189 | end; | |
7190 | ||
7191 | when N_Type_Conversion => | |
7192 | return | |
7193 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7194 | and then |
7195 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7196 | |
7197 | when N_Unary_Op => | |
7198 | return | |
7199 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
7200 | and then |
7201 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
7202 | |
7203 | when N_Unchecked_Type_Conversion => | |
7204 | return | |
7205 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7206 | and then |
7207 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7208 | |
7209 | -- All other node types cannot appear in this context. Strictly | |
7210 | -- we should raise a fatal internal error. Instead we just ignore | |
7211 | -- the nodes. This means that if anyone makes a mistake in the | |
7212 | -- expander and mucks an expression tree irretrievably, the | |
7213 | -- result will be a failure to detect a (probably very obscure) | |
7214 | -- case of non-conformance, which is better than bombing on some | |
7215 | -- case where two expressions do in fact conform. | |
7216 | ||
7217 | when others => | |
7218 | return True; | |
7219 | ||
7220 | end case; | |
7221 | end if; | |
7222 | end Fully_Conformant_Expressions; | |
7223 | ||
fbf5a39b AC |
7224 | ---------------------------------------- |
7225 | -- Fully_Conformant_Discrete_Subtypes -- | |
7226 | ---------------------------------------- | |
7227 | ||
7228 | function Fully_Conformant_Discrete_Subtypes | |
7229 | (Given_S1 : Node_Id; | |
d05ef0ab | 7230 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
7231 | is |
7232 | S1 : constant Node_Id := Original_Node (Given_S1); | |
7233 | S2 : constant Node_Id := Original_Node (Given_S2); | |
7234 | ||
7235 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
7236 | -- Special-case for a bound given by a discriminant, which in the body |
7237 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
7238 | |
7239 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 7240 | -- Check both bounds |
fbf5a39b | 7241 | |
5d37ba92 ES |
7242 | ----------------------- |
7243 | -- Conforming_Bounds -- | |
7244 | ----------------------- | |
7245 | ||
fbf5a39b AC |
7246 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
7247 | begin | |
7248 | if Is_Entity_Name (B1) | |
7249 | and then Is_Entity_Name (B2) | |
7250 | and then Ekind (Entity (B1)) = E_Discriminant | |
7251 | then | |
7252 | return Chars (B1) = Chars (B2); | |
7253 | ||
7254 | else | |
7255 | return Fully_Conformant_Expressions (B1, B2); | |
7256 | end if; | |
7257 | end Conforming_Bounds; | |
7258 | ||
5d37ba92 ES |
7259 | ----------------------- |
7260 | -- Conforming_Ranges -- | |
7261 | ----------------------- | |
7262 | ||
fbf5a39b AC |
7263 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
7264 | begin | |
7265 | return | |
7266 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
7267 | and then | |
7268 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
7269 | end Conforming_Ranges; | |
7270 | ||
7271 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
7272 | ||
7273 | begin | |
7274 | if Nkind (S1) /= Nkind (S2) then | |
7275 | return False; | |
7276 | ||
7277 | elsif Is_Entity_Name (S1) then | |
7278 | return Entity (S1) = Entity (S2); | |
7279 | ||
7280 | elsif Nkind (S1) = N_Range then | |
7281 | return Conforming_Ranges (S1, S2); | |
7282 | ||
7283 | elsif Nkind (S1) = N_Subtype_Indication then | |
7284 | return | |
7285 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
7286 | and then | |
7287 | Conforming_Ranges | |
7288 | (Range_Expression (Constraint (S1)), | |
7289 | Range_Expression (Constraint (S2))); | |
7290 | else | |
7291 | return True; | |
7292 | end if; | |
7293 | end Fully_Conformant_Discrete_Subtypes; | |
7294 | ||
996ae0b0 RK |
7295 | -------------------- |
7296 | -- Install_Entity -- | |
7297 | -------------------- | |
7298 | ||
7299 | procedure Install_Entity (E : Entity_Id) is | |
7300 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
7301 | begin |
7302 | Set_Is_Immediately_Visible (E); | |
7303 | Set_Current_Entity (E); | |
7304 | Set_Homonym (E, Prev); | |
7305 | end Install_Entity; | |
7306 | ||
7307 | --------------------- | |
7308 | -- Install_Formals -- | |
7309 | --------------------- | |
7310 | ||
7311 | procedure Install_Formals (Id : Entity_Id) is | |
7312 | F : Entity_Id; | |
996ae0b0 RK |
7313 | begin |
7314 | F := First_Formal (Id); | |
996ae0b0 RK |
7315 | while Present (F) loop |
7316 | Install_Entity (F); | |
7317 | Next_Formal (F); | |
7318 | end loop; | |
7319 | end Install_Formals; | |
7320 | ||
ce2b6ba5 JM |
7321 | ----------------------------- |
7322 | -- Is_Interface_Conformant -- | |
7323 | ----------------------------- | |
7324 | ||
7325 | function Is_Interface_Conformant | |
7326 | (Tagged_Type : Entity_Id; | |
7327 | Iface_Prim : Entity_Id; | |
7328 | Prim : Entity_Id) return Boolean | |
7329 | is | |
fceeaab6 ES |
7330 | Iface : constant Entity_Id := Find_Dispatching_Type (Iface_Prim); |
7331 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); | |
7332 | ||
25ebc085 AC |
7333 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
7334 | -- Return the controlling formal of Prim | |
7335 | ||
59e6b23c AC |
7336 | ------------------------ |
7337 | -- Controlling_Formal -- | |
7338 | ------------------------ | |
7339 | ||
25ebc085 AC |
7340 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
7341 | E : Entity_Id := First_Entity (Prim); | |
59e6b23c | 7342 | |
25ebc085 AC |
7343 | begin |
7344 | while Present (E) loop | |
7345 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
7346 | return E; | |
7347 | end if; | |
7348 | ||
7349 | Next_Entity (E); | |
7350 | end loop; | |
7351 | ||
7352 | return Empty; | |
7353 | end Controlling_Formal; | |
7354 | ||
7355 | -- Local variables | |
7356 | ||
7357 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
7358 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
7359 | ||
7360 | -- Start of processing for Is_Interface_Conformant | |
7361 | ||
ce2b6ba5 JM |
7362 | begin |
7363 | pragma Assert (Is_Subprogram (Iface_Prim) | |
7364 | and then Is_Subprogram (Prim) | |
7365 | and then Is_Dispatching_Operation (Iface_Prim) | |
7366 | and then Is_Dispatching_Operation (Prim)); | |
7367 | ||
fceeaab6 | 7368 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
7369 | or else (Present (Alias (Iface_Prim)) |
7370 | and then | |
7371 | Is_Interface | |
7372 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
7373 | ||
7374 | if Prim = Iface_Prim | |
7375 | or else not Is_Subprogram (Prim) | |
7376 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
7377 | or else not Is_Dispatching_Operation (Prim) | |
7378 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 ES |
7379 | or else No (Typ) |
7380 | or else Base_Type (Typ) /= Tagged_Type | |
ce2b6ba5 JM |
7381 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
7382 | then | |
7383 | return False; | |
7384 | ||
25ebc085 AC |
7385 | -- The mode of the controlling formals must match |
7386 | ||
7387 | elsif Present (Iface_Ctrl_F) | |
7388 | and then Present (Prim_Ctrl_F) | |
7389 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
7390 | then | |
7391 | return False; | |
7392 | ||
7393 | -- Case of a procedure, or a function whose result type matches the | |
7394 | -- result type of the interface primitive, or a function that has no | |
7395 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
7396 | |
7397 | elsif Ekind (Iface_Prim) = E_Procedure | |
7398 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 7399 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 7400 | then |
b4d7b435 AC |
7401 | return Type_Conformant |
7402 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 7403 | |
fceeaab6 ES |
7404 | -- Case of a function returning an interface, or an access to one. |
7405 | -- Check that the return types correspond. | |
ce2b6ba5 | 7406 | |
fceeaab6 ES |
7407 | elsif Implements_Interface (Typ, Iface) then |
7408 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
7409 | /= |
7410 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
7411 | then |
7412 | return False; | |
fceeaab6 ES |
7413 | else |
7414 | return | |
ce2b6ba5 JM |
7415 | Type_Conformant (Prim, Iface_Prim, |
7416 | Skip_Controlling_Formals => True); | |
fceeaab6 | 7417 | end if; |
ce2b6ba5 | 7418 | |
fceeaab6 ES |
7419 | else |
7420 | return False; | |
ce2b6ba5 | 7421 | end if; |
ce2b6ba5 JM |
7422 | end Is_Interface_Conformant; |
7423 | ||
996ae0b0 RK |
7424 | --------------------------------- |
7425 | -- Is_Non_Overriding_Operation -- | |
7426 | --------------------------------- | |
7427 | ||
7428 | function Is_Non_Overriding_Operation | |
7429 | (Prev_E : Entity_Id; | |
d05ef0ab | 7430 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
7431 | is |
7432 | Formal : Entity_Id; | |
7433 | F_Typ : Entity_Id; | |
7434 | G_Typ : Entity_Id := Empty; | |
7435 | ||
7436 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
7437 | -- If F_Type is a derived type associated with a generic actual subtype, |
7438 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
7439 | |
7440 | function Types_Correspond | |
7441 | (P_Type : Entity_Id; | |
d05ef0ab | 7442 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
7443 | -- Returns true if and only if the types (or designated types in the |
7444 | -- case of anonymous access types) are the same or N_Type is derived | |
7445 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
7446 | |
7447 | ----------------------------- | |
7448 | -- Get_Generic_Parent_Type -- | |
7449 | ----------------------------- | |
7450 | ||
7451 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
7452 | G_Typ : Entity_Id; | |
702d2020 | 7453 | Defn : Node_Id; |
996ae0b0 RK |
7454 | Indic : Node_Id; |
7455 | ||
7456 | begin | |
7457 | if Is_Derived_Type (F_Typ) | |
7458 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
7459 | then | |
82c80734 RD |
7460 | -- The tree must be traversed to determine the parent subtype in |
7461 | -- the generic unit, which unfortunately isn't always available | |
7462 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
7463 | -- is needed for cases where a full derived type has been | |
7464 | -- rewritten.) | |
996ae0b0 | 7465 | |
702d2020 AC |
7466 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); |
7467 | if Nkind (Defn) = N_Derived_Type_Definition then | |
7468 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 7469 | |
702d2020 AC |
7470 | if Nkind (Indic) = N_Subtype_Indication then |
7471 | G_Typ := Entity (Subtype_Mark (Indic)); | |
7472 | else | |
7473 | G_Typ := Entity (Indic); | |
7474 | end if; | |
996ae0b0 | 7475 | |
702d2020 AC |
7476 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
7477 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
7478 | then | |
7479 | return Generic_Parent_Type (Parent (G_Typ)); | |
7480 | end if; | |
996ae0b0 RK |
7481 | end if; |
7482 | end if; | |
7483 | ||
7484 | return Empty; | |
7485 | end Get_Generic_Parent_Type; | |
7486 | ||
7487 | ---------------------- | |
7488 | -- Types_Correspond -- | |
7489 | ---------------------- | |
7490 | ||
7491 | function Types_Correspond | |
7492 | (P_Type : Entity_Id; | |
d05ef0ab | 7493 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
7494 | is |
7495 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
7496 | New_Type : Entity_Id := Base_Type (N_Type); | |
7497 | ||
7498 | begin | |
7499 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
7500 | Prev_Type := Designated_Type (Prev_Type); | |
7501 | end if; | |
7502 | ||
7503 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
7504 | New_Type := Designated_Type (New_Type); | |
7505 | end if; | |
7506 | ||
7507 | if Prev_Type = New_Type then | |
7508 | return True; | |
7509 | ||
7510 | elsif not Is_Class_Wide_Type (New_Type) then | |
7511 | while Etype (New_Type) /= New_Type loop | |
7512 | New_Type := Etype (New_Type); | |
7513 | if New_Type = Prev_Type then | |
7514 | return True; | |
7515 | end if; | |
7516 | end loop; | |
7517 | end if; | |
7518 | return False; | |
7519 | end Types_Correspond; | |
7520 | ||
7521 | -- Start of processing for Is_Non_Overriding_Operation | |
7522 | ||
7523 | begin | |
82c80734 RD |
7524 | -- In the case where both operations are implicit derived subprograms |
7525 | -- then neither overrides the other. This can only occur in certain | |
7526 | -- obscure cases (e.g., derivation from homographs created in a generic | |
7527 | -- instantiation). | |
996ae0b0 RK |
7528 | |
7529 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
7530 | return True; | |
7531 | ||
7532 | elsif Ekind (Current_Scope) = E_Package | |
7533 | and then Is_Generic_Instance (Current_Scope) | |
7534 | and then In_Private_Part (Current_Scope) | |
7535 | and then Comes_From_Source (New_E) | |
7536 | then | |
702d2020 AC |
7537 | -- We examine the formals and result type of the inherited operation, |
7538 | -- to determine whether their type is derived from (the instance of) | |
7539 | -- a generic type. The first such formal or result type is the one | |
7540 | -- tested. | |
996ae0b0 RK |
7541 | |
7542 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
7543 | while Present (Formal) loop |
7544 | F_Typ := Base_Type (Etype (Formal)); | |
7545 | ||
7546 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
7547 | F_Typ := Designated_Type (F_Typ); | |
7548 | end if; | |
7549 | ||
7550 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 7551 | exit when Present (G_Typ); |
996ae0b0 RK |
7552 | |
7553 | Next_Formal (Formal); | |
7554 | end loop; | |
7555 | ||
c8ef728f | 7556 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
7557 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
7558 | end if; | |
7559 | ||
7560 | if No (G_Typ) then | |
7561 | return False; | |
7562 | end if; | |
7563 | ||
8dbd1460 AC |
7564 | -- If the generic type is a private type, then the original operation |
7565 | -- was not overriding in the generic, because there was no primitive | |
7566 | -- operation to override. | |
996ae0b0 RK |
7567 | |
7568 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
7569 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 7570 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
7571 | then |
7572 | return True; | |
7573 | ||
7574 | -- The generic parent type is the ancestor of a formal derived | |
7575 | -- type declaration. We need to check whether it has a primitive | |
7576 | -- operation that should be overridden by New_E in the generic. | |
7577 | ||
7578 | else | |
7579 | declare | |
7580 | P_Formal : Entity_Id; | |
7581 | N_Formal : Entity_Id; | |
7582 | P_Typ : Entity_Id; | |
7583 | N_Typ : Entity_Id; | |
7584 | P_Prim : Entity_Id; | |
7585 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
7586 | ||
7587 | begin | |
7588 | while Present (Prim_Elt) loop | |
7589 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 7590 | |
996ae0b0 RK |
7591 | if Chars (P_Prim) = Chars (New_E) |
7592 | and then Ekind (P_Prim) = Ekind (New_E) | |
7593 | then | |
7594 | P_Formal := First_Formal (P_Prim); | |
7595 | N_Formal := First_Formal (New_E); | |
7596 | while Present (P_Formal) and then Present (N_Formal) loop | |
7597 | P_Typ := Etype (P_Formal); | |
7598 | N_Typ := Etype (N_Formal); | |
7599 | ||
7600 | if not Types_Correspond (P_Typ, N_Typ) then | |
7601 | exit; | |
7602 | end if; | |
7603 | ||
7604 | Next_Entity (P_Formal); | |
7605 | Next_Entity (N_Formal); | |
7606 | end loop; | |
7607 | ||
82c80734 RD |
7608 | -- Found a matching primitive operation belonging to the |
7609 | -- formal ancestor type, so the new subprogram is | |
7610 | -- overriding. | |
996ae0b0 | 7611 | |
c8ef728f ES |
7612 | if No (P_Formal) |
7613 | and then No (N_Formal) | |
996ae0b0 RK |
7614 | and then (Ekind (New_E) /= E_Function |
7615 | or else | |
7616 | Types_Correspond | |
7617 | (Etype (P_Prim), Etype (New_E))) | |
7618 | then | |
7619 | return False; | |
7620 | end if; | |
7621 | end if; | |
7622 | ||
7623 | Next_Elmt (Prim_Elt); | |
7624 | end loop; | |
7625 | ||
82c80734 RD |
7626 | -- If no match found, then the new subprogram does not |
7627 | -- override in the generic (nor in the instance). | |
996ae0b0 RK |
7628 | |
7629 | return True; | |
7630 | end; | |
7631 | end if; | |
7632 | else | |
7633 | return False; | |
7634 | end if; | |
7635 | end Is_Non_Overriding_Operation; | |
7636 | ||
beacce02 AC |
7637 | ------------------------------------- |
7638 | -- List_Inherited_Pre_Post_Aspects -- | |
7639 | ------------------------------------- | |
7640 | ||
7641 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
7642 | begin | |
e606088a | 7643 | if Opt.List_Inherited_Aspects |
beacce02 AC |
7644 | and then (Is_Subprogram (E) or else Is_Generic_Subprogram (E)) |
7645 | then | |
7646 | declare | |
7647 | Inherited : constant Subprogram_List := | |
7648 | Inherited_Subprograms (E); | |
7649 | P : Node_Id; | |
7650 | ||
7651 | begin | |
7652 | for J in Inherited'Range loop | |
dac3bede YM |
7653 | P := Spec_PPC_List (Contract (Inherited (J))); |
7654 | ||
beacce02 AC |
7655 | while Present (P) loop |
7656 | Error_Msg_Sloc := Sloc (P); | |
7657 | ||
7658 | if Class_Present (P) and then not Split_PPC (P) then | |
7659 | if Pragma_Name (P) = Name_Precondition then | |
7660 | Error_Msg_N | |
7661 | ("?info: & inherits `Pre''Class` aspect from #", E); | |
7662 | else | |
7663 | Error_Msg_N | |
7664 | ("?info: & inherits `Post''Class` aspect from #", E); | |
7665 | end if; | |
7666 | end if; | |
7667 | ||
7668 | P := Next_Pragma (P); | |
7669 | end loop; | |
7670 | end loop; | |
7671 | end; | |
7672 | end if; | |
7673 | end List_Inherited_Pre_Post_Aspects; | |
7674 | ||
996ae0b0 RK |
7675 | ------------------------------ |
7676 | -- Make_Inequality_Operator -- | |
7677 | ------------------------------ | |
7678 | ||
7679 | -- S is the defining identifier of an equality operator. We build a | |
7680 | -- subprogram declaration with the right signature. This operation is | |
7681 | -- intrinsic, because it is always expanded as the negation of the | |
7682 | -- call to the equality function. | |
7683 | ||
7684 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
7685 | Loc : constant Source_Ptr := Sloc (S); | |
7686 | Decl : Node_Id; | |
7687 | Formals : List_Id; | |
7688 | Op_Name : Entity_Id; | |
7689 | ||
c8ef728f ES |
7690 | FF : constant Entity_Id := First_Formal (S); |
7691 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
7692 | |
7693 | begin | |
c8ef728f | 7694 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 7695 | |
c8ef728f | 7696 | if No (NF) then |
996ae0b0 RK |
7697 | return; |
7698 | end if; | |
7699 | ||
c8ef728f ES |
7700 | declare |
7701 | A : constant Entity_Id := | |
7702 | Make_Defining_Identifier (Sloc (FF), | |
7703 | Chars => Chars (FF)); | |
7704 | ||
5d37ba92 ES |
7705 | B : constant Entity_Id := |
7706 | Make_Defining_Identifier (Sloc (NF), | |
7707 | Chars => Chars (NF)); | |
c8ef728f ES |
7708 | |
7709 | begin | |
7710 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
7711 | ||
7712 | Formals := New_List ( | |
7713 | Make_Parameter_Specification (Loc, | |
7714 | Defining_Identifier => A, | |
7715 | Parameter_Type => | |
7716 | New_Reference_To (Etype (First_Formal (S)), | |
7717 | Sloc (Etype (First_Formal (S))))), | |
7718 | ||
7719 | Make_Parameter_Specification (Loc, | |
7720 | Defining_Identifier => B, | |
7721 | Parameter_Type => | |
7722 | New_Reference_To (Etype (Next_Formal (First_Formal (S))), | |
7723 | Sloc (Etype (Next_Formal (First_Formal (S))))))); | |
7724 | ||
7725 | Decl := | |
7726 | Make_Subprogram_Declaration (Loc, | |
7727 | Specification => | |
7728 | Make_Function_Specification (Loc, | |
7729 | Defining_Unit_Name => Op_Name, | |
7730 | Parameter_Specifications => Formals, | |
7731 | Result_Definition => | |
7732 | New_Reference_To (Standard_Boolean, Loc))); | |
7733 | ||
7734 | -- Insert inequality right after equality if it is explicit or after | |
7735 | -- the derived type when implicit. These entities are created only | |
7736 | -- for visibility purposes, and eventually replaced in the course of | |
7737 | -- expansion, so they do not need to be attached to the tree and seen | |
7738 | -- by the back-end. Keeping them internal also avoids spurious | |
7739 | -- freezing problems. The declaration is inserted in the tree for | |
7740 | -- analysis, and removed afterwards. If the equality operator comes | |
7741 | -- from an explicit declaration, attach the inequality immediately | |
7742 | -- after. Else the equality is inherited from a derived type | |
7743 | -- declaration, so insert inequality after that declaration. | |
7744 | ||
7745 | if No (Alias (S)) then | |
7746 | Insert_After (Unit_Declaration_Node (S), Decl); | |
7747 | elsif Is_List_Member (Parent (S)) then | |
7748 | Insert_After (Parent (S), Decl); | |
7749 | else | |
7750 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
7751 | end if; | |
996ae0b0 | 7752 | |
c8ef728f ES |
7753 | Mark_Rewrite_Insertion (Decl); |
7754 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
7755 | Analyze (Decl); | |
7756 | Remove (Decl); | |
7757 | Set_Has_Completion (Op_Name); | |
7758 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 7759 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 7760 | end; |
996ae0b0 RK |
7761 | end Make_Inequality_Operator; |
7762 | ||
7763 | ---------------------- | |
7764 | -- May_Need_Actuals -- | |
7765 | ---------------------- | |
7766 | ||
7767 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
7768 | F : Entity_Id; | |
7769 | B : Boolean; | |
7770 | ||
7771 | begin | |
7772 | F := First_Formal (Fun); | |
7773 | B := True; | |
996ae0b0 RK |
7774 | while Present (F) loop |
7775 | if No (Default_Value (F)) then | |
7776 | B := False; | |
7777 | exit; | |
7778 | end if; | |
7779 | ||
7780 | Next_Formal (F); | |
7781 | end loop; | |
7782 | ||
7783 | Set_Needs_No_Actuals (Fun, B); | |
7784 | end May_Need_Actuals; | |
7785 | ||
7786 | --------------------- | |
7787 | -- Mode_Conformant -- | |
7788 | --------------------- | |
7789 | ||
7790 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
7791 | Result : Boolean; | |
996ae0b0 RK |
7792 | begin |
7793 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
7794 | return Result; | |
7795 | end Mode_Conformant; | |
7796 | ||
7797 | --------------------------- | |
7798 | -- New_Overloaded_Entity -- | |
7799 | --------------------------- | |
7800 | ||
7801 | procedure New_Overloaded_Entity | |
7802 | (S : Entity_Id; | |
7803 | Derived_Type : Entity_Id := Empty) | |
7804 | is | |
ec4867fa | 7805 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
7806 | -- Set if the current scope has an operation that is type-conformant |
7807 | -- with S, and becomes hidden by S. | |
7808 | ||
5d37ba92 ES |
7809 | Is_Primitive_Subp : Boolean; |
7810 | -- Set to True if the new subprogram is primitive | |
7811 | ||
fbf5a39b AC |
7812 | E : Entity_Id; |
7813 | -- Entity that S overrides | |
7814 | ||
996ae0b0 | 7815 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
7816 | -- Predecessor of E in Homonym chain |
7817 | ||
5d37ba92 ES |
7818 | procedure Check_For_Primitive_Subprogram |
7819 | (Is_Primitive : out Boolean; | |
7820 | Is_Overriding : Boolean := False); | |
7821 | -- If the subprogram being analyzed is a primitive operation of the type | |
7822 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
7823 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
7824 | -- corresponding flag on the entity itself for later use. | |
7825 | ||
ec4867fa ES |
7826 | procedure Check_Synchronized_Overriding |
7827 | (Def_Id : Entity_Id; | |
ec4867fa ES |
7828 | Overridden_Subp : out Entity_Id); |
7829 | -- First determine if Def_Id is an entry or a subprogram either defined | |
7830 | -- in the scope of a task or protected type, or is a primitive of such | |
7831 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
7832 | -- implemented by the synchronized type, return the overridden entity | |
7833 | -- or Empty. | |
758c442c | 7834 | |
996ae0b0 RK |
7835 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
7836 | -- Check that E is declared in the private part of the current package, | |
7837 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 7838 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
7839 | -- set when freezing entities, so we must examine the place of the |
7840 | -- declaration in the tree, and recognize wrapper packages as well. | |
7841 | ||
2ddc2000 AC |
7842 | function Is_Overriding_Alias |
7843 | (Old_E : Entity_Id; | |
7844 | New_E : Entity_Id) return Boolean; | |
7845 | -- Check whether new subprogram and old subprogram are both inherited | |
7846 | -- from subprograms that have distinct dispatch table entries. This can | |
7847 | -- occur with derivations from instances with accidental homonyms. | |
7848 | -- The function is conservative given that the converse is only true | |
7849 | -- within instances that contain accidental overloadings. | |
7850 | ||
5d37ba92 ES |
7851 | ------------------------------------ |
7852 | -- Check_For_Primitive_Subprogram -- | |
7853 | ------------------------------------ | |
996ae0b0 | 7854 | |
5d37ba92 ES |
7855 | procedure Check_For_Primitive_Subprogram |
7856 | (Is_Primitive : out Boolean; | |
7857 | Is_Overriding : Boolean := False) | |
ec4867fa | 7858 | is |
996ae0b0 RK |
7859 | Formal : Entity_Id; |
7860 | F_Typ : Entity_Id; | |
07fc65c4 | 7861 | B_Typ : Entity_Id; |
996ae0b0 RK |
7862 | |
7863 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
7864 | -- Returns true if T is declared in the visible part of the current |
7865 | -- package scope; otherwise returns false. Assumes that T is declared | |
7866 | -- in a package. | |
996ae0b0 RK |
7867 | |
7868 | procedure Check_Private_Overriding (T : Entity_Id); | |
7869 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
7870 | -- abstract type is declared in a private part, then it must override |
7871 | -- an abstract subprogram declared in the visible part. Also checks | |
7872 | -- that if a primitive function with a controlling result is declared | |
7873 | -- in a private part, then it must override a function declared in | |
7874 | -- the visible part. | |
996ae0b0 RK |
7875 | |
7876 | ------------------------------ | |
7877 | -- Check_Private_Overriding -- | |
7878 | ------------------------------ | |
7879 | ||
7880 | procedure Check_Private_Overriding (T : Entity_Id) is | |
7881 | begin | |
51c16e29 | 7882 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
7883 | and then In_Private_Part (Current_Scope) |
7884 | and then Visible_Part_Type (T) | |
7885 | and then not In_Instance | |
7886 | then | |
f937473f RD |
7887 | if Is_Abstract_Type (T) |
7888 | and then Is_Abstract_Subprogram (S) | |
7889 | and then (not Is_Overriding | |
8dbd1460 | 7890 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 7891 | then |
ed2233dc | 7892 | Error_Msg_N |
19d846a0 RD |
7893 | ("abstract subprograms must be visible " |
7894 | & "(RM 3.9.3(10))!", S); | |
758c442c | 7895 | |
996ae0b0 | 7896 | elsif Ekind (S) = E_Function |
82c80734 | 7897 | and then not Is_Overriding |
996ae0b0 | 7898 | then |
2e79de51 AC |
7899 | if Is_Tagged_Type (T) |
7900 | and then T = Base_Type (Etype (S)) | |
7901 | then | |
7902 | Error_Msg_N | |
7903 | ("private function with tagged result must" | |
7904 | & " override visible-part function", S); | |
7905 | Error_Msg_N | |
7906 | ("\move subprogram to the visible part" | |
7907 | & " (RM 3.9.3(10))", S); | |
7908 | ||
7909 | -- AI05-0073: extend this test to the case of a function | |
7910 | -- with a controlling access result. | |
7911 | ||
7912 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
7913 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
7914 | and then | |
7915 | not Is_Class_Wide_Type (Designated_Type (Etype (S))) | |
dbe945f1 | 7916 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
7917 | then |
7918 | Error_Msg_N | |
7919 | ("private function with controlling access result " | |
7920 | & "must override visible-part function", S); | |
7921 | Error_Msg_N | |
7922 | ("\move subprogram to the visible part" | |
7923 | & " (RM 3.9.3(10))", S); | |
7924 | end if; | |
996ae0b0 RK |
7925 | end if; |
7926 | end if; | |
7927 | end Check_Private_Overriding; | |
7928 | ||
7929 | ----------------------- | |
7930 | -- Visible_Part_Type -- | |
7931 | ----------------------- | |
7932 | ||
7933 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
7934 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
7935 | N : Node_Id; | |
996ae0b0 RK |
7936 | |
7937 | begin | |
8dbd1460 AC |
7938 | -- If the entity is a private type, then it must be declared in a |
7939 | -- visible part. | |
996ae0b0 RK |
7940 | |
7941 | if Ekind (T) in Private_Kind then | |
7942 | return True; | |
7943 | end if; | |
7944 | ||
7945 | -- Otherwise, we traverse the visible part looking for its | |
7946 | -- corresponding declaration. We cannot use the declaration | |
7947 | -- node directly because in the private part the entity of a | |
7948 | -- private type is the one in the full view, which does not | |
7949 | -- indicate that it is the completion of something visible. | |
7950 | ||
07fc65c4 | 7951 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
7952 | while Present (N) loop |
7953 | if Nkind (N) = N_Full_Type_Declaration | |
7954 | and then Present (Defining_Identifier (N)) | |
7955 | and then T = Defining_Identifier (N) | |
7956 | then | |
7957 | return True; | |
7958 | ||
800621e0 RD |
7959 | elsif Nkind_In (N, N_Private_Type_Declaration, |
7960 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
7961 | and then Present (Defining_Identifier (N)) |
7962 | and then T = Full_View (Defining_Identifier (N)) | |
7963 | then | |
7964 | return True; | |
7965 | end if; | |
7966 | ||
7967 | Next (N); | |
7968 | end loop; | |
7969 | ||
7970 | return False; | |
7971 | end Visible_Part_Type; | |
7972 | ||
5d37ba92 | 7973 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
7974 | |
7975 | begin | |
5d37ba92 ES |
7976 | Is_Primitive := False; |
7977 | ||
996ae0b0 RK |
7978 | if not Comes_From_Source (S) then |
7979 | null; | |
7980 | ||
5d37ba92 | 7981 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
7982 | |
7983 | elsif Current_Scope = Standard_Standard then | |
7984 | null; | |
7985 | ||
b9b2405f | 7986 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 7987 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 7988 | or else Is_Overriding |
996ae0b0 | 7989 | then |
07fc65c4 | 7990 | -- For function, check return type |
996ae0b0 | 7991 | |
07fc65c4 | 7992 | if Ekind (S) = E_Function then |
5d37ba92 ES |
7993 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
7994 | F_Typ := Designated_Type (Etype (S)); | |
7995 | else | |
7996 | F_Typ := Etype (S); | |
7997 | end if; | |
7998 | ||
7999 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 8000 | |
5d37ba92 ES |
8001 | if Scope (B_Typ) = Current_Scope |
8002 | and then not Is_Class_Wide_Type (B_Typ) | |
8003 | and then not Is_Generic_Type (B_Typ) | |
8004 | then | |
8005 | Is_Primitive := True; | |
07fc65c4 | 8006 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 8007 | Set_Is_Primitive (S); |
07fc65c4 GB |
8008 | Check_Private_Overriding (B_Typ); |
8009 | end if; | |
996ae0b0 RK |
8010 | end if; |
8011 | ||
07fc65c4 | 8012 | -- For all subprograms, check formals |
996ae0b0 | 8013 | |
07fc65c4 | 8014 | Formal := First_Formal (S); |
996ae0b0 RK |
8015 | while Present (Formal) loop |
8016 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
8017 | F_Typ := Designated_Type (Etype (Formal)); | |
8018 | else | |
8019 | F_Typ := Etype (Formal); | |
8020 | end if; | |
8021 | ||
07fc65c4 GB |
8022 | B_Typ := Base_Type (F_Typ); |
8023 | ||
ec4867fa ES |
8024 | if Ekind (B_Typ) = E_Access_Subtype then |
8025 | B_Typ := Base_Type (B_Typ); | |
8026 | end if; | |
8027 | ||
5d37ba92 ES |
8028 | if Scope (B_Typ) = Current_Scope |
8029 | and then not Is_Class_Wide_Type (B_Typ) | |
8030 | and then not Is_Generic_Type (B_Typ) | |
8031 | then | |
8032 | Is_Primitive := True; | |
8033 | Set_Is_Primitive (S); | |
07fc65c4 GB |
8034 | Set_Has_Primitive_Operations (B_Typ); |
8035 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
8036 | end if; |
8037 | ||
8038 | Next_Formal (Formal); | |
8039 | end loop; | |
996ae0b0 | 8040 | end if; |
5d37ba92 ES |
8041 | end Check_For_Primitive_Subprogram; |
8042 | ||
8043 | ----------------------------------- | |
8044 | -- Check_Synchronized_Overriding -- | |
8045 | ----------------------------------- | |
8046 | ||
8047 | procedure Check_Synchronized_Overriding | |
8048 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
8049 | Overridden_Subp : out Entity_Id) |
8050 | is | |
5d37ba92 ES |
8051 | Ifaces_List : Elist_Id; |
8052 | In_Scope : Boolean; | |
8053 | Typ : Entity_Id; | |
8054 | ||
8aa15e3b JM |
8055 | function Matches_Prefixed_View_Profile |
8056 | (Prim_Params : List_Id; | |
8057 | Iface_Params : List_Id) return Boolean; | |
8058 | -- Determine whether a subprogram's parameter profile Prim_Params | |
8059 | -- matches that of a potentially overridden interface subprogram | |
8060 | -- Iface_Params. Also determine if the type of first parameter of | |
8061 | -- Iface_Params is an implemented interface. | |
8062 | ||
8aa15e3b JM |
8063 | ----------------------------------- |
8064 | -- Matches_Prefixed_View_Profile -- | |
8065 | ----------------------------------- | |
8066 | ||
8067 | function Matches_Prefixed_View_Profile | |
8068 | (Prim_Params : List_Id; | |
8069 | Iface_Params : List_Id) return Boolean | |
8070 | is | |
8071 | Iface_Id : Entity_Id; | |
8072 | Iface_Param : Node_Id; | |
8073 | Iface_Typ : Entity_Id; | |
8074 | Prim_Id : Entity_Id; | |
8075 | Prim_Param : Node_Id; | |
8076 | Prim_Typ : Entity_Id; | |
8077 | ||
8078 | function Is_Implemented | |
8079 | (Ifaces_List : Elist_Id; | |
8080 | Iface : Entity_Id) return Boolean; | |
8081 | -- Determine if Iface is implemented by the current task or | |
8082 | -- protected type. | |
8083 | ||
8084 | -------------------- | |
8085 | -- Is_Implemented -- | |
8086 | -------------------- | |
8087 | ||
8088 | function Is_Implemented | |
8089 | (Ifaces_List : Elist_Id; | |
8090 | Iface : Entity_Id) return Boolean | |
8091 | is | |
8092 | Iface_Elmt : Elmt_Id; | |
8093 | ||
8094 | begin | |
8095 | Iface_Elmt := First_Elmt (Ifaces_List); | |
8096 | while Present (Iface_Elmt) loop | |
8097 | if Node (Iface_Elmt) = Iface then | |
8098 | return True; | |
8099 | end if; | |
8100 | ||
8101 | Next_Elmt (Iface_Elmt); | |
8102 | end loop; | |
8103 | ||
8104 | return False; | |
8105 | end Is_Implemented; | |
8106 | ||
8107 | -- Start of processing for Matches_Prefixed_View_Profile | |
8108 | ||
8109 | begin | |
8110 | Iface_Param := First (Iface_Params); | |
8111 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
8112 | ||
8113 | if Is_Access_Type (Iface_Typ) then | |
8114 | Iface_Typ := Designated_Type (Iface_Typ); | |
8115 | end if; | |
8116 | ||
8117 | Prim_Param := First (Prim_Params); | |
8118 | ||
8119 | -- The first parameter of the potentially overridden subprogram | |
8120 | -- must be an interface implemented by Prim. | |
8121 | ||
8122 | if not Is_Interface (Iface_Typ) | |
8123 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
8124 | then | |
8125 | return False; | |
8126 | end if; | |
8127 | ||
8128 | -- The checks on the object parameters are done, move onto the | |
8129 | -- rest of the parameters. | |
8130 | ||
8131 | if not In_Scope then | |
8132 | Prim_Param := Next (Prim_Param); | |
8133 | end if; | |
8134 | ||
8135 | Iface_Param := Next (Iface_Param); | |
8136 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
8137 | Iface_Id := Defining_Identifier (Iface_Param); | |
8138 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
8139 | ||
8aa15e3b JM |
8140 | Prim_Id := Defining_Identifier (Prim_Param); |
8141 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
8142 | ||
15e4986c JM |
8143 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
8144 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
8145 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
8146 | then | |
8147 | Iface_Typ := Designated_Type (Iface_Typ); | |
8148 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
8149 | end if; |
8150 | ||
8151 | -- Case of multiple interface types inside a parameter profile | |
8152 | ||
8153 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
8154 | ||
8155 | -- If the interface type is implemented, then the matching type | |
8156 | -- in the primitive should be the implementing record type. | |
8157 | ||
8158 | if Ekind (Iface_Typ) = E_Record_Type | |
8159 | and then Is_Interface (Iface_Typ) | |
8160 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
8161 | then | |
8162 | if Prim_Typ /= Typ then | |
8163 | return False; | |
8164 | end if; | |
8165 | ||
8166 | -- The two parameters must be both mode and subtype conformant | |
8167 | ||
8168 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
8169 | or else not | |
8170 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
8171 | then | |
8172 | return False; | |
8173 | end if; | |
8174 | ||
8175 | Next (Iface_Param); | |
8176 | Next (Prim_Param); | |
8177 | end loop; | |
8178 | ||
8179 | -- One of the two lists contains more parameters than the other | |
8180 | ||
8181 | if Present (Iface_Param) or else Present (Prim_Param) then | |
8182 | return False; | |
8183 | end if; | |
8184 | ||
8185 | return True; | |
8186 | end Matches_Prefixed_View_Profile; | |
8187 | ||
8188 | -- Start of processing for Check_Synchronized_Overriding | |
8189 | ||
5d37ba92 ES |
8190 | begin |
8191 | Overridden_Subp := Empty; | |
8192 | ||
8aa15e3b JM |
8193 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
8194 | -- primitives internally generated by the frontend; however at this | |
8195 | -- stage predefined primitives are still not fully decorated. As a | |
8196 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 8197 | |
8aa15e3b JM |
8198 | if (Ekind (Def_Id) /= E_Entry |
8199 | and then Ekind (Def_Id) /= E_Function | |
8200 | and then Ekind (Def_Id) /= E_Procedure) | |
8201 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
8202 | then |
8203 | return; | |
8204 | end if; | |
8205 | ||
8206 | -- Search for the concurrent declaration since it contains the list | |
8207 | -- of all implemented interfaces. In this case, the subprogram is | |
8208 | -- declared within the scope of a protected or a task type. | |
8209 | ||
8210 | if Present (Scope (Def_Id)) | |
8211 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
8212 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
8213 | then | |
8214 | Typ := Scope (Def_Id); | |
8215 | In_Scope := True; | |
8216 | ||
8aa15e3b | 8217 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 8218 | -- has no formals. |
8aa15e3b JM |
8219 | |
8220 | elsif No (First_Formal (Def_Id)) then | |
8221 | return; | |
5d37ba92 | 8222 | |
8aa15e3b | 8223 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 8224 | -- concurrent type. |
5d37ba92 | 8225 | |
8aa15e3b JM |
8226 | else |
8227 | Typ := Etype (First_Formal (Def_Id)); | |
8228 | ||
8229 | if Is_Access_Type (Typ) then | |
8230 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
8231 | end if; |
8232 | ||
8aa15e3b JM |
8233 | if Is_Concurrent_Type (Typ) |
8234 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 8235 | then |
5d37ba92 ES |
8236 | In_Scope := False; |
8237 | ||
8238 | -- This case occurs when the concurrent type is declared within | |
8239 | -- a generic unit. As a result the corresponding record has been | |
8240 | -- built and used as the type of the first formal, we just have | |
8241 | -- to retrieve the corresponding concurrent type. | |
8242 | ||
8aa15e3b | 8243 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 8244 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 8245 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 8246 | then |
8aa15e3b | 8247 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
8248 | In_Scope := False; |
8249 | ||
8250 | else | |
8251 | return; | |
8252 | end if; | |
8aa15e3b JM |
8253 | end if; |
8254 | ||
8255 | -- There is no overriding to check if is an inherited operation in a | |
8256 | -- type derivation on for a generic actual. | |
8257 | ||
8258 | Collect_Interfaces (Typ, Ifaces_List); | |
8259 | ||
8260 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
8261 | return; |
8262 | end if; | |
8263 | ||
8aa15e3b JM |
8264 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
8265 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 8266 | |
8aa15e3b JM |
8267 | declare |
8268 | Candidate : Entity_Id := Empty; | |
8269 | Hom : Entity_Id := Empty; | |
8270 | Iface_Typ : Entity_Id; | |
8271 | Subp : Entity_Id := Empty; | |
8272 | ||
8273 | begin | |
4adf3c50 | 8274 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
8275 | -- overridden subprogram that belongs to an implemented |
8276 | -- interface. | |
8277 | ||
8278 | Hom := Current_Entity_In_Scope (Def_Id); | |
8279 | while Present (Hom) loop | |
8280 | Subp := Hom; | |
8281 | ||
15e4986c JM |
8282 | if Subp = Def_Id |
8283 | or else not Is_Overloadable (Subp) | |
8284 | or else not Is_Primitive (Subp) | |
8285 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 8286 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 8287 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 8288 | then |
15e4986c | 8289 | null; |
8aa15e3b | 8290 | |
15e4986c | 8291 | -- Entries and procedures can override abstract or null |
4adf3c50 | 8292 | -- interface procedures. |
8aa15e3b | 8293 | |
15e4986c JM |
8294 | elsif (Ekind (Def_Id) = E_Procedure |
8295 | or else Ekind (Def_Id) = E_Entry) | |
8aa15e3b | 8296 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
8297 | and then Matches_Prefixed_View_Profile |
8298 | (Parameter_Specifications (Parent (Def_Id)), | |
8299 | Parameter_Specifications (Parent (Subp))) | |
8300 | then | |
8301 | Candidate := Subp; | |
8302 | ||
15e4986c JM |
8303 | -- For an overridden subprogram Subp, check whether the mode |
8304 | -- of its first parameter is correct depending on the kind | |
8305 | -- of synchronized type. | |
8aa15e3b | 8306 | |
15e4986c JM |
8307 | declare |
8308 | Formal : constant Node_Id := First_Formal (Candidate); | |
8309 | ||
8310 | begin | |
8311 | -- In order for an entry or a protected procedure to | |
8312 | -- override, the first parameter of the overridden | |
8313 | -- routine must be of mode "out", "in out" or | |
8314 | -- access-to-variable. | |
8315 | ||
8316 | if (Ekind (Candidate) = E_Entry | |
8317 | or else Ekind (Candidate) = E_Procedure) | |
8318 | and then Is_Protected_Type (Typ) | |
8319 | and then Ekind (Formal) /= E_In_Out_Parameter | |
8320 | and then Ekind (Formal) /= E_Out_Parameter | |
8321 | and then Nkind (Parameter_Type (Parent (Formal))) | |
8322 | /= N_Access_Definition | |
8323 | then | |
8324 | null; | |
8325 | ||
8326 | -- All other cases are OK since a task entry or routine | |
8327 | -- does not have a restriction on the mode of the first | |
8328 | -- parameter of the overridden interface routine. | |
8329 | ||
8330 | else | |
8331 | Overridden_Subp := Candidate; | |
8332 | return; | |
8333 | end if; | |
8334 | end; | |
8aa15e3b JM |
8335 | |
8336 | -- Functions can override abstract interface functions | |
8337 | ||
8338 | elsif Ekind (Def_Id) = E_Function | |
8339 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
8340 | and then Matches_Prefixed_View_Profile |
8341 | (Parameter_Specifications (Parent (Def_Id)), | |
8342 | Parameter_Specifications (Parent (Subp))) | |
8343 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
8344 | Etype (Result_Definition (Parent (Subp))) | |
8345 | then | |
8346 | Overridden_Subp := Subp; | |
8347 | return; | |
8348 | end if; | |
8349 | ||
8350 | Hom := Homonym (Hom); | |
8351 | end loop; | |
8352 | ||
4adf3c50 AC |
8353 | -- After examining all candidates for overriding, we are left with |
8354 | -- the best match which is a mode incompatible interface routine. | |
8355 | -- Do not emit an error if the Expander is active since this error | |
8356 | -- will be detected later on after all concurrent types are | |
8357 | -- expanded and all wrappers are built. This check is meant for | |
8358 | -- spec-only compilations. | |
8aa15e3b | 8359 | |
4adf3c50 | 8360 | if Present (Candidate) and then not Expander_Active then |
8aa15e3b JM |
8361 | Iface_Typ := |
8362 | Find_Parameter_Type (Parent (First_Formal (Candidate))); | |
8363 | ||
4adf3c50 AC |
8364 | -- Def_Id is primitive of a protected type, declared inside the |
8365 | -- type, and the candidate is primitive of a limited or | |
8366 | -- synchronized interface. | |
8aa15e3b JM |
8367 | |
8368 | if In_Scope | |
8369 | and then Is_Protected_Type (Typ) | |
8370 | and then | |
8371 | (Is_Limited_Interface (Iface_Typ) | |
c199ccf7 AC |
8372 | or else Is_Protected_Interface (Iface_Typ) |
8373 | or else Is_Synchronized_Interface (Iface_Typ) | |
8374 | or else Is_Task_Interface (Iface_Typ)) | |
8aa15e3b | 8375 | then |
dd54644b | 8376 | Error_Msg_PT (Parent (Typ), Candidate); |
8aa15e3b | 8377 | end if; |
5d37ba92 | 8378 | end if; |
8aa15e3b JM |
8379 | |
8380 | Overridden_Subp := Candidate; | |
8381 | return; | |
8382 | end; | |
5d37ba92 ES |
8383 | end Check_Synchronized_Overriding; |
8384 | ||
8385 | ---------------------------- | |
8386 | -- Is_Private_Declaration -- | |
8387 | ---------------------------- | |
8388 | ||
8389 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
8390 | Priv_Decls : List_Id; | |
8391 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
8392 | ||
8393 | begin | |
8394 | if Is_Package_Or_Generic_Package (Current_Scope) | |
8395 | and then In_Private_Part (Current_Scope) | |
8396 | then | |
8397 | Priv_Decls := | |
8398 | Private_Declarations ( | |
8399 | Specification (Unit_Declaration_Node (Current_Scope))); | |
8400 | ||
8401 | return In_Package_Body (Current_Scope) | |
8402 | or else | |
8403 | (Is_List_Member (Decl) | |
8404 | and then List_Containing (Decl) = Priv_Decls) | |
8405 | or else (Nkind (Parent (Decl)) = N_Package_Specification | |
8dbd1460 AC |
8406 | and then not |
8407 | Is_Compilation_Unit | |
8408 | (Defining_Entity (Parent (Decl))) | |
5d37ba92 | 8409 | and then List_Containing (Parent (Parent (Decl))) |
8dbd1460 | 8410 | = Priv_Decls); |
5d37ba92 ES |
8411 | else |
8412 | return False; | |
8413 | end if; | |
8414 | end Is_Private_Declaration; | |
996ae0b0 | 8415 | |
2ddc2000 AC |
8416 | -------------------------- |
8417 | -- Is_Overriding_Alias -- | |
8418 | -------------------------- | |
8419 | ||
8420 | function Is_Overriding_Alias | |
8421 | (Old_E : Entity_Id; | |
8422 | New_E : Entity_Id) return Boolean | |
8423 | is | |
8424 | AO : constant Entity_Id := Alias (Old_E); | |
8425 | AN : constant Entity_Id := Alias (New_E); | |
8426 | ||
8427 | begin | |
8428 | return Scope (AO) /= Scope (AN) | |
8429 | or else No (DTC_Entity (AO)) | |
8430 | or else No (DTC_Entity (AN)) | |
8431 | or else DT_Position (AO) = DT_Position (AN); | |
8432 | end Is_Overriding_Alias; | |
8433 | ||
996ae0b0 RK |
8434 | -- Start of processing for New_Overloaded_Entity |
8435 | ||
8436 | begin | |
fbf5a39b AC |
8437 | -- We need to look for an entity that S may override. This must be a |
8438 | -- homonym in the current scope, so we look for the first homonym of | |
8439 | -- S in the current scope as the starting point for the search. | |
8440 | ||
8441 | E := Current_Entity_In_Scope (S); | |
8442 | ||
947430d5 AC |
8443 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
8444 | -- They are directly added to the list of primitive operations of | |
8445 | -- Derived_Type, unless this is a rederivation in the private part | |
8446 | -- of an operation that was already derived in the visible part of | |
8447 | -- the current package. | |
8448 | ||
0791fbe9 | 8449 | if Ada_Version >= Ada_2005 |
947430d5 AC |
8450 | and then Present (Derived_Type) |
8451 | and then Present (Alias (S)) | |
8452 | and then Is_Dispatching_Operation (Alias (S)) | |
8453 | and then Present (Find_Dispatching_Type (Alias (S))) | |
8454 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
8455 | then | |
8456 | -- For private types, when the full-view is processed we propagate to | |
8457 | -- the full view the non-overridden entities whose attribute "alias" | |
8458 | -- references an interface primitive. These entities were added by | |
8459 | -- Derive_Subprograms to ensure that interface primitives are | |
8460 | -- covered. | |
8461 | ||
8462 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
8463 | -- internal entity that links an interface primitive with its | |
8464 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 8465 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
8466 | |
8467 | if Inside_Freezing_Actions = 0 | |
8468 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
8469 | and then In_Private_Part (Current_Scope) | |
8470 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
8471 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
8472 | and then Full_View (Defining_Identifier (Parent (E))) | |
8473 | = Defining_Identifier (Parent (S)) | |
8474 | and then Alias (E) = Alias (S) | |
8475 | then | |
8476 | Check_Operation_From_Private_View (S, E); | |
8477 | Set_Is_Dispatching_Operation (S); | |
8478 | ||
8479 | -- Common case | |
8480 | ||
8481 | else | |
8482 | Enter_Overloaded_Entity (S); | |
8483 | Check_Dispatching_Operation (S, Empty); | |
8484 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
8485 | end if; | |
8486 | ||
8487 | return; | |
8488 | end if; | |
8489 | ||
fbf5a39b AC |
8490 | -- If there is no homonym then this is definitely not overriding |
8491 | ||
996ae0b0 RK |
8492 | if No (E) then |
8493 | Enter_Overloaded_Entity (S); | |
8494 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 8495 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 8496 | |
ec4867fa ES |
8497 | -- If subprogram has an explicit declaration, check whether it |
8498 | -- has an overriding indicator. | |
758c442c | 8499 | |
ec4867fa | 8500 | if Comes_From_Source (S) then |
8aa15e3b | 8501 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
8502 | |
8503 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
8504 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 8505 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
8506 | -- overriding indicator. |
8507 | ||
8508 | if Ada_Version >= Ada_2012 | |
8509 | and then No (Overridden_Subp) | |
8510 | and then Is_Dispatching_Operation (S) | |
038140ed | 8511 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
8512 | then |
8513 | Overridden_Subp := Overridden_Operation (S); | |
8514 | end if; | |
8515 | ||
5d37ba92 ES |
8516 | Check_Overriding_Indicator |
8517 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
758c442c GD |
8518 | end if; |
8519 | ||
fbf5a39b AC |
8520 | -- If there is a homonym that is not overloadable, then we have an |
8521 | -- error, except for the special cases checked explicitly below. | |
8522 | ||
996ae0b0 RK |
8523 | elsif not Is_Overloadable (E) then |
8524 | ||
8525 | -- Check for spurious conflict produced by a subprogram that has the | |
8526 | -- same name as that of the enclosing generic package. The conflict | |
8527 | -- occurs within an instance, between the subprogram and the renaming | |
8528 | -- declaration for the package. After the subprogram, the package | |
8529 | -- renaming declaration becomes hidden. | |
8530 | ||
8531 | if Ekind (E) = E_Package | |
8532 | and then Present (Renamed_Object (E)) | |
8533 | and then Renamed_Object (E) = Current_Scope | |
8534 | and then Nkind (Parent (Renamed_Object (E))) = | |
8535 | N_Package_Specification | |
8536 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
8537 | then | |
8538 | Set_Is_Hidden (E); | |
8539 | Set_Is_Immediately_Visible (E, False); | |
8540 | Enter_Overloaded_Entity (S); | |
8541 | Set_Homonym (S, Homonym (E)); | |
8542 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 8543 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
8544 | |
8545 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
8546 | -- declaration. However if it is dispatching, it must appear in the |
8547 | -- dispatch table anyway, because it can be dispatched to even if it | |
8548 | -- cannot be called directly. | |
996ae0b0 | 8549 | |
4adf3c50 | 8550 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
8551 | Set_Scope (S, Current_Scope); |
8552 | ||
8553 | if Is_Dispatching_Operation (Alias (S)) then | |
8554 | Check_Dispatching_Operation (S, Empty); | |
8555 | end if; | |
8556 | ||
8557 | return; | |
8558 | ||
8559 | else | |
8560 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 8561 | |
f3d57416 | 8562 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
8563 | |
8564 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
8565 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
8566 | Error_Msg_N ("\& conflicts with declaration#", S); | |
8567 | else | |
8568 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
8569 | end if; |
8570 | ||
8571 | return; | |
8572 | end if; | |
8573 | ||
fbf5a39b AC |
8574 | -- E exists and is overloadable |
8575 | ||
996ae0b0 | 8576 | else |
8aa15e3b | 8577 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 8578 | |
82c80734 RD |
8579 | -- Loop through E and its homonyms to determine if any of them is |
8580 | -- the candidate for overriding by S. | |
996ae0b0 RK |
8581 | |
8582 | while Present (E) loop | |
fbf5a39b AC |
8583 | |
8584 | -- Definitely not interesting if not in the current scope | |
8585 | ||
996ae0b0 RK |
8586 | if Scope (E) /= Current_Scope then |
8587 | null; | |
8588 | ||
25ebc085 AC |
8589 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
8590 | -- null procedures locate the internally generated spec. We | |
8591 | -- enforce mode conformance since a tagged type may inherit | |
8592 | -- from interfaces several null primitives which differ only | |
8593 | -- in the mode of the formals. | |
8594 | ||
8595 | elsif not Comes_From_Source (S) | |
8596 | and then Is_Null_Procedure (S) | |
8597 | and then not Mode_Conformant (E, S) | |
8598 | then | |
8599 | null; | |
8600 | ||
fbf5a39b AC |
8601 | -- Check if we have type conformance |
8602 | ||
ec4867fa | 8603 | elsif Type_Conformant (E, S) then |
c8ef728f | 8604 | |
82c80734 RD |
8605 | -- If the old and new entities have the same profile and one |
8606 | -- is not the body of the other, then this is an error, unless | |
8607 | -- one of them is implicitly declared. | |
996ae0b0 RK |
8608 | |
8609 | -- There are some cases when both can be implicit, for example | |
8610 | -- when both a literal and a function that overrides it are | |
f3d57416 | 8611 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 8612 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 8613 | -- a private extension. Ada 83 had a special rule for the |
82c80734 RD |
8614 | -- literal case. In Ada95, the later implicit operation hides |
8615 | -- the former, and the literal is always the former. In the | |
8616 | -- odd case where both are derived operations declared at the | |
8617 | -- same point, both operations should be declared, and in that | |
8618 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
8619 | -- part. This can only occur for certain obscure cases in |
8620 | -- instances, when an operation on a type derived from a formal | |
8621 | -- private type does not override a homograph inherited from | |
8622 | -- the actual. In subsequent derivations of such a type, the | |
8623 | -- DT positions of these operations remain distinct, if they | |
8624 | -- have been set. | |
996ae0b0 RK |
8625 | |
8626 | if Present (Alias (S)) | |
8627 | and then (No (Alias (E)) | |
8628 | or else Comes_From_Source (E) | |
2ddc2000 | 8629 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
8630 | or else |
8631 | (Is_Dispatching_Operation (E) | |
2ddc2000 | 8632 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 8633 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 8634 | then |
82c80734 RD |
8635 | -- When an derived operation is overloaded it may be due to |
8636 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
8637 | -- re-inherits. It has to be dealt with. |
8638 | ||
e660dbf7 | 8639 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
8640 | and then In_Private_Part (Current_Scope) |
8641 | then | |
8642 | Check_Operation_From_Private_View (S, E); | |
8643 | end if; | |
8644 | ||
038140ed AC |
8645 | -- In any case the implicit operation remains hidden by the |
8646 | -- existing declaration, which is overriding. Indicate that | |
8647 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 8648 | |
038140ed AC |
8649 | if Present (Alias (S)) then |
8650 | Set_Overridden_Operation (E, Alias (S)); | |
8651 | else | |
8652 | Set_Overridden_Operation (E, S); | |
8653 | end if; | |
758c442c GD |
8654 | |
8655 | if Comes_From_Source (E) then | |
5d37ba92 | 8656 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
758c442c GD |
8657 | end if; |
8658 | ||
996ae0b0 RK |
8659 | return; |
8660 | ||
26a43556 AC |
8661 | -- Within an instance, the renaming declarations for actual |
8662 | -- subprograms may become ambiguous, but they do not hide each | |
8663 | -- other. | |
996ae0b0 RK |
8664 | |
8665 | elsif Ekind (E) /= E_Entry | |
8666 | and then not Comes_From_Source (E) | |
8667 | and then not Is_Generic_Instance (E) | |
8668 | and then (Present (Alias (E)) | |
8669 | or else Is_Intrinsic_Subprogram (E)) | |
8670 | and then (not In_Instance | |
8671 | or else No (Parent (E)) | |
8672 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 8673 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 8674 | then |
26a43556 AC |
8675 | -- A subprogram child unit is not allowed to override an |
8676 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
8677 | |
8678 | if Is_Child_Unit (S) then | |
8679 | Error_Msg_N | |
8680 | ("child unit overrides inherited subprogram in parent", | |
8681 | S); | |
8682 | return; | |
8683 | end if; | |
8684 | ||
8685 | if Is_Non_Overriding_Operation (E, S) then | |
8686 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 8687 | |
c8ef728f | 8688 | if No (Derived_Type) |
996ae0b0 RK |
8689 | or else Is_Tagged_Type (Derived_Type) |
8690 | then | |
8691 | Check_Dispatching_Operation (S, Empty); | |
8692 | end if; | |
8693 | ||
8694 | return; | |
8695 | end if; | |
8696 | ||
8697 | -- E is a derived operation or an internal operator which | |
8698 | -- is being overridden. Remove E from further visibility. | |
8699 | -- Furthermore, if E is a dispatching operation, it must be | |
8700 | -- replaced in the list of primitive operations of its type | |
8701 | -- (see Override_Dispatching_Operation). | |
8702 | ||
ec4867fa | 8703 | Overridden_Subp := E; |
758c442c | 8704 | |
996ae0b0 RK |
8705 | declare |
8706 | Prev : Entity_Id; | |
8707 | ||
8708 | begin | |
8709 | Prev := First_Entity (Current_Scope); | |
996ae0b0 RK |
8710 | while Present (Prev) |
8711 | and then Next_Entity (Prev) /= E | |
8712 | loop | |
8713 | Next_Entity (Prev); | |
8714 | end loop; | |
8715 | ||
8716 | -- It is possible for E to be in the current scope and | |
8717 | -- yet not in the entity chain. This can only occur in a | |
8718 | -- generic context where E is an implicit concatenation | |
8719 | -- in the formal part, because in a generic body the | |
8720 | -- entity chain starts with the formals. | |
8721 | ||
8722 | pragma Assert | |
8723 | (Present (Prev) or else Chars (E) = Name_Op_Concat); | |
8724 | ||
8725 | -- E must be removed both from the entity_list of the | |
8726 | -- current scope, and from the visibility chain | |
8727 | ||
8728 | if Debug_Flag_E then | |
8729 | Write_Str ("Override implicit operation "); | |
8730 | Write_Int (Int (E)); | |
8731 | Write_Eol; | |
8732 | end if; | |
8733 | ||
8734 | -- If E is a predefined concatenation, it stands for four | |
8735 | -- different operations. As a result, a single explicit | |
8736 | -- declaration does not hide it. In a possible ambiguous | |
8737 | -- situation, Disambiguate chooses the user-defined op, | |
8738 | -- so it is correct to retain the previous internal one. | |
8739 | ||
8740 | if Chars (E) /= Name_Op_Concat | |
8741 | or else Ekind (E) /= E_Operator | |
8742 | then | |
8743 | -- For nondispatching derived operations that are | |
8744 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
8745 | -- part of a package, we retain the derived subprogram |
8746 | -- but mark it as not immediately visible. If the | |
8747 | -- derived operation was declared in the visible part | |
8748 | -- then this ensures that it will still be visible | |
8749 | -- outside the package with the proper signature | |
8750 | -- (calls from outside must also be directed to this | |
8751 | -- version rather than the overriding one, unlike the | |
8752 | -- dispatching case). Calls from inside the package | |
8753 | -- will still resolve to the overriding subprogram | |
8754 | -- since the derived one is marked as not visible | |
8755 | -- within the package. | |
996ae0b0 RK |
8756 | |
8757 | -- If the private operation is dispatching, we achieve | |
8758 | -- the overriding by keeping the implicit operation | |
9865d858 | 8759 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
8760 | -- this fashion the proper body is executed in all |
8761 | -- cases, but the original signature is used outside | |
8762 | -- of the package. | |
8763 | ||
8764 | -- If the overriding is not in the private part, we | |
8765 | -- remove the implicit operation altogether. | |
8766 | ||
8767 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
8768 | if not Is_Dispatching_Operation (E) then |
8769 | Set_Is_Immediately_Visible (E, False); | |
8770 | else | |
e895b435 ES |
8771 | -- Work done in Override_Dispatching_Operation, |
8772 | -- so nothing else need to be done here. | |
996ae0b0 RK |
8773 | |
8774 | null; | |
8775 | end if; | |
996ae0b0 | 8776 | |
fbf5a39b AC |
8777 | else |
8778 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
8779 | |
8780 | if E = Current_Entity (E) then | |
8781 | Prev_Vis := Empty; | |
8782 | else | |
8783 | Prev_Vis := Current_Entity (E); | |
8784 | while Homonym (Prev_Vis) /= E loop | |
8785 | Prev_Vis := Homonym (Prev_Vis); | |
8786 | end loop; | |
8787 | end if; | |
8788 | ||
8789 | if Prev_Vis /= Empty then | |
8790 | ||
8791 | -- Skip E in the visibility chain | |
8792 | ||
8793 | Set_Homonym (Prev_Vis, Homonym (E)); | |
8794 | ||
8795 | else | |
8796 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
8797 | end if; | |
8798 | ||
8799 | Set_Next_Entity (Prev, Next_Entity (E)); | |
8800 | ||
8801 | if No (Next_Entity (Prev)) then | |
8802 | Set_Last_Entity (Current_Scope, Prev); | |
8803 | end if; | |
996ae0b0 RK |
8804 | end if; |
8805 | end if; | |
8806 | ||
8807 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
8808 | |
8809 | -- For entities generated by Derive_Subprograms the | |
8810 | -- overridden operation is the inherited primitive | |
8811 | -- (which is available through the attribute alias). | |
8812 | ||
8813 | if not (Comes_From_Source (E)) | |
8814 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
8815 | and then Find_Dispatching_Type (E) = |
8816 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
8817 | and then Present (Alias (E)) |
8818 | and then Comes_From_Source (Alias (E)) | |
8819 | then | |
8820 | Set_Overridden_Operation (S, Alias (E)); | |
2fe829ae | 8821 | |
6320f5e1 AC |
8822 | -- Normal case of setting entity as overridden |
8823 | ||
8824 | -- Note: Static_Initialization and Overridden_Operation | |
8825 | -- attributes use the same field in subprogram entities. | |
8826 | -- Static_Initialization is only defined for internal | |
8827 | -- initialization procedures, where Overridden_Operation | |
8828 | -- is irrelevant. Therefore the setting of this attribute | |
8829 | -- must check whether the target is an init_proc. | |
8830 | ||
2fe829ae | 8831 | elsif not Is_Init_Proc (S) then |
1c1289e7 AC |
8832 | Set_Overridden_Operation (S, E); |
8833 | end if; | |
8834 | ||
5d37ba92 | 8835 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 8836 | |
fc53fe76 | 8837 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
8838 | -- expanded to override an inherited null procedure, or a |
8839 | -- predefined dispatching primitive then indicate that E | |
038140ed | 8840 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
8841 | |
8842 | if Comes_From_Source (S) | |
8843 | or else | |
8844 | (Present (Parent (S)) | |
8845 | and then | |
8846 | Nkind (Parent (S)) = N_Procedure_Specification | |
8847 | and then | |
8848 | Null_Present (Parent (S))) | |
38ef8ebe AC |
8849 | or else |
8850 | (Present (Alias (E)) | |
f16e8df9 RD |
8851 | and then |
8852 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 8853 | then |
c8ef728f | 8854 | if Present (Alias (E)) then |
41251c60 | 8855 | Set_Overridden_Operation (S, Alias (E)); |
41251c60 JM |
8856 | end if; |
8857 | end if; | |
8858 | ||
996ae0b0 | 8859 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 8860 | |
82c80734 | 8861 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 8862 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
8863 | |
8864 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
8865 | Check_Dispatching_Operation (S, E); |
8866 | ||
996ae0b0 RK |
8867 | else |
8868 | Check_Dispatching_Operation (S, Empty); | |
8869 | end if; | |
8870 | ||
5d37ba92 ES |
8871 | Check_For_Primitive_Subprogram |
8872 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
8873 | goto Check_Inequality; |
8874 | end; | |
8875 | ||
8876 | -- Apparent redeclarations in instances can occur when two | |
8877 | -- formal types get the same actual type. The subprograms in | |
8878 | -- in the instance are legal, even if not callable from the | |
8879 | -- outside. Calls from within are disambiguated elsewhere. | |
8880 | -- For dispatching operations in the visible part, the usual | |
8881 | -- rules apply, and operations with the same profile are not | |
8882 | -- legal (B830001). | |
8883 | ||
8884 | elsif (In_Instance_Visible_Part | |
8885 | and then not Is_Dispatching_Operation (E)) | |
8886 | or else In_Instance_Not_Visible | |
8887 | then | |
8888 | null; | |
8889 | ||
8890 | -- Here we have a real error (identical profile) | |
8891 | ||
8892 | else | |
8893 | Error_Msg_Sloc := Sloc (E); | |
8894 | ||
8895 | -- Avoid cascaded errors if the entity appears in | |
8896 | -- subsequent calls. | |
8897 | ||
8898 | Set_Scope (S, Current_Scope); | |
8899 | ||
5d37ba92 ES |
8900 | -- Generate error, with extra useful warning for the case |
8901 | -- of a generic instance with no completion. | |
996ae0b0 RK |
8902 | |
8903 | if Is_Generic_Instance (S) | |
8904 | and then not Has_Completion (E) | |
8905 | then | |
8906 | Error_Msg_N | |
5d37ba92 ES |
8907 | ("instantiation cannot provide body for&", S); |
8908 | Error_Msg_N ("\& conflicts with declaration#", S); | |
8909 | else | |
8910 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
8911 | end if; |
8912 | ||
8913 | return; | |
8914 | end if; | |
8915 | ||
8916 | else | |
c8ef728f ES |
8917 | -- If one subprogram has an access parameter and the other |
8918 | -- a parameter of an access type, calls to either might be | |
8919 | -- ambiguous. Verify that parameters match except for the | |
8920 | -- access parameter. | |
8921 | ||
8922 | if May_Hide_Profile then | |
8923 | declare | |
ec4867fa ES |
8924 | F1 : Entity_Id; |
8925 | F2 : Entity_Id; | |
8dbd1460 | 8926 | |
c8ef728f ES |
8927 | begin |
8928 | F1 := First_Formal (S); | |
8929 | F2 := First_Formal (E); | |
8930 | while Present (F1) and then Present (F2) loop | |
8931 | if Is_Access_Type (Etype (F1)) then | |
8932 | if not Is_Access_Type (Etype (F2)) | |
8933 | or else not Conforming_Types | |
8934 | (Designated_Type (Etype (F1)), | |
8935 | Designated_Type (Etype (F2)), | |
8936 | Type_Conformant) | |
8937 | then | |
8938 | May_Hide_Profile := False; | |
8939 | end if; | |
8940 | ||
8941 | elsif | |
8942 | not Conforming_Types | |
8943 | (Etype (F1), Etype (F2), Type_Conformant) | |
8944 | then | |
8945 | May_Hide_Profile := False; | |
8946 | end if; | |
8947 | ||
8948 | Next_Formal (F1); | |
8949 | Next_Formal (F2); | |
8950 | end loop; | |
8951 | ||
8952 | if May_Hide_Profile | |
8953 | and then No (F1) | |
8954 | and then No (F2) | |
8955 | then | |
8956 | Error_Msg_NE ("calls to& may be ambiguous?", S, S); | |
8957 | end if; | |
8958 | end; | |
8959 | end if; | |
996ae0b0 RK |
8960 | end if; |
8961 | ||
996ae0b0 RK |
8962 | E := Homonym (E); |
8963 | end loop; | |
8964 | ||
8965 | -- On exit, we know that S is a new entity | |
8966 | ||
8967 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
8968 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
8969 | Check_Overriding_Indicator | |
8970 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 8971 | |
c4d67e2d | 8972 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 8973 | |
c4d67e2d AC |
8974 | if Nkind (S) /= N_Defining_Operator_Symbol then |
8975 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
8976 | Check_SPARK_Restriction | |
8977 | ("overloading not allowed with entity#", S); | |
8978 | end if; | |
8ed68165 | 8979 | |
82c80734 RD |
8980 | -- If S is a derived operation for an untagged type then by |
8981 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
8982 | -- operation was dispatching), so Check_Dispatching_Operation is not |
8983 | -- called in that case. | |
996ae0b0 | 8984 | |
c8ef728f | 8985 | if No (Derived_Type) |
996ae0b0 RK |
8986 | or else Is_Tagged_Type (Derived_Type) |
8987 | then | |
8988 | Check_Dispatching_Operation (S, Empty); | |
8989 | end if; | |
8990 | end if; | |
8991 | ||
82c80734 RD |
8992 | -- If this is a user-defined equality operator that is not a derived |
8993 | -- subprogram, create the corresponding inequality. If the operation is | |
8994 | -- dispatching, the expansion is done elsewhere, and we do not create | |
8995 | -- an explicit inequality operation. | |
996ae0b0 RK |
8996 | |
8997 | <<Check_Inequality>> | |
8998 | if Chars (S) = Name_Op_Eq | |
8999 | and then Etype (S) = Standard_Boolean | |
9000 | and then Present (Parent (S)) | |
9001 | and then not Is_Dispatching_Operation (S) | |
9002 | then | |
9003 | Make_Inequality_Operator (S); | |
d151d6a3 | 9004 | |
dbe945f1 | 9005 | if Ada_Version >= Ada_2012 then |
e5a58fac AC |
9006 | Check_Untagged_Equality (S); |
9007 | end if; | |
996ae0b0 | 9008 | end if; |
996ae0b0 RK |
9009 | end New_Overloaded_Entity; |
9010 | ||
9011 | --------------------- | |
9012 | -- Process_Formals -- | |
9013 | --------------------- | |
9014 | ||
9015 | procedure Process_Formals | |
07fc65c4 | 9016 | (T : List_Id; |
996ae0b0 RK |
9017 | Related_Nod : Node_Id) |
9018 | is | |
9019 | Param_Spec : Node_Id; | |
9020 | Formal : Entity_Id; | |
9021 | Formal_Type : Entity_Id; | |
9022 | Default : Node_Id; | |
9023 | Ptype : Entity_Id; | |
9024 | ||
800621e0 RD |
9025 | Num_Out_Params : Nat := 0; |
9026 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 9027 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 9028 | |
950d217a AC |
9029 | function Designates_From_With_Type (Typ : Entity_Id) return Boolean; |
9030 | -- Determine whether an access type designates a type coming from a | |
9031 | -- limited view. | |
9032 | ||
07fc65c4 | 9033 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
9034 | -- Check whether the default has a class-wide type. After analysis the |
9035 | -- default has the type of the formal, so we must also check explicitly | |
9036 | -- for an access attribute. | |
07fc65c4 | 9037 | |
950d217a AC |
9038 | ------------------------------- |
9039 | -- Designates_From_With_Type -- | |
9040 | ------------------------------- | |
9041 | ||
9042 | function Designates_From_With_Type (Typ : Entity_Id) return Boolean is | |
9043 | Desig : Entity_Id := Typ; | |
9044 | ||
9045 | begin | |
9046 | if Is_Access_Type (Desig) then | |
9047 | Desig := Directly_Designated_Type (Desig); | |
9048 | end if; | |
9049 | ||
9050 | if Is_Class_Wide_Type (Desig) then | |
9051 | Desig := Root_Type (Desig); | |
9052 | end if; | |
9053 | ||
9054 | return | |
9055 | Ekind (Desig) = E_Incomplete_Type | |
9056 | and then From_With_Type (Desig); | |
9057 | end Designates_From_With_Type; | |
9058 | ||
07fc65c4 GB |
9059 | --------------------------- |
9060 | -- Is_Class_Wide_Default -- | |
9061 | --------------------------- | |
9062 | ||
9063 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
9064 | begin | |
9065 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
9066 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
9067 | and then Attribute_Name (D) = Name_Access |
9068 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
9069 | end Is_Class_Wide_Default; |
9070 | ||
9071 | -- Start of processing for Process_Formals | |
9072 | ||
996ae0b0 RK |
9073 | begin |
9074 | -- In order to prevent premature use of the formals in the same formal | |
9075 | -- part, the Ekind is left undefined until all default expressions are | |
9076 | -- analyzed. The Ekind is established in a separate loop at the end. | |
9077 | ||
9078 | Param_Spec := First (T); | |
996ae0b0 | 9079 | while Present (Param_Spec) loop |
996ae0b0 | 9080 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 9081 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
9082 | Enter_Name (Formal); |
9083 | ||
9084 | -- Case of ordinary parameters | |
9085 | ||
9086 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
9087 | Find_Type (Parameter_Type (Param_Spec)); | |
9088 | Ptype := Parameter_Type (Param_Spec); | |
9089 | ||
9090 | if Ptype = Error then | |
9091 | goto Continue; | |
9092 | end if; | |
9093 | ||
9094 | Formal_Type := Entity (Ptype); | |
9095 | ||
ec4867fa ES |
9096 | if Is_Incomplete_Type (Formal_Type) |
9097 | or else | |
9098 | (Is_Class_Wide_Type (Formal_Type) | |
9099 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) | |
996ae0b0 | 9100 | then |
93bcda23 AC |
9101 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
9102 | -- primitive operations, as long as their completion is | |
9103 | -- in the same declarative part. If in the private part | |
9104 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
9105 | -- Check is done on package exit. For access to subprograms, |
9106 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 9107 | |
d8db0bca | 9108 | if Is_Tagged_Type (Formal_Type) then |
93bcda23 | 9109 | if Ekind (Scope (Current_Scope)) = E_Package |
93bcda23 AC |
9110 | and then not From_With_Type (Formal_Type) |
9111 | and then not Is_Class_Wide_Type (Formal_Type) | |
9112 | then | |
cec29135 ES |
9113 | if not Nkind_In |
9114 | (Parent (T), N_Access_Function_Definition, | |
9115 | N_Access_Procedure_Definition) | |
9116 | then | |
9117 | Append_Elmt | |
9118 | (Current_Scope, | |
9119 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
9120 | |
9121 | -- Freezing is delayed to ensure that Register_Prim | |
9122 | -- will get called for this operation, which is needed | |
9123 | -- in cases where static dispatch tables aren't built. | |
9124 | -- (Note that the same is done for controlling access | |
9125 | -- parameter cases in function Access_Definition.) | |
9126 | ||
9127 | Set_Has_Delayed_Freeze (Current_Scope); | |
cec29135 | 9128 | end if; |
93bcda23 | 9129 | end if; |
fbf5a39b | 9130 | |
0a36105d JM |
9131 | -- Special handling of Value_Type for CIL case |
9132 | ||
9133 | elsif Is_Value_Type (Formal_Type) then | |
9134 | null; | |
9135 | ||
800621e0 RD |
9136 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
9137 | N_Access_Procedure_Definition) | |
996ae0b0 | 9138 | then |
dd386db0 AC |
9139 | -- AI05-0151: Tagged incomplete types are allowed in all |
9140 | -- formal parts. Untagged incomplete types are not allowed | |
9141 | -- in bodies. | |
9142 | ||
9143 | if Ada_Version >= Ada_2012 then | |
9144 | if Is_Tagged_Type (Formal_Type) then | |
9145 | null; | |
9146 | ||
0f1a6a0b AC |
9147 | elsif Nkind_In (Parent (Parent (T)), N_Accept_Statement, |
9148 | N_Entry_Body, | |
9149 | N_Subprogram_Body) | |
dd386db0 AC |
9150 | then |
9151 | Error_Msg_NE | |
9152 | ("invalid use of untagged incomplete type&", | |
0f1a6a0b | 9153 | Ptype, Formal_Type); |
dd386db0 AC |
9154 | end if; |
9155 | ||
9156 | else | |
9157 | Error_Msg_NE | |
9158 | ("invalid use of incomplete type&", | |
0f1a6a0b | 9159 | Param_Spec, Formal_Type); |
dd386db0 AC |
9160 | |
9161 | -- Further checks on the legality of incomplete types | |
9162 | -- in formal parts are delayed until the freeze point | |
9163 | -- of the enclosing subprogram or access to subprogram. | |
9164 | end if; | |
996ae0b0 RK |
9165 | end if; |
9166 | ||
9167 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
9168 | Error_Msg_NE |
9169 | ("premature use of&", | |
9170 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
9171 | end if; |
9172 | ||
fecbd779 AC |
9173 | -- Ada 2012 (AI-142): Handle aliased parameters |
9174 | ||
9175 | if Ada_Version >= Ada_2012 | |
9176 | and then Aliased_Present (Param_Spec) | |
9177 | then | |
9178 | Set_Is_Aliased (Formal); | |
9179 | end if; | |
9180 | ||
0ab80019 | 9181 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 9182 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
9183 | -- formal in the enclosing scope. Finally, replace the parameter |
9184 | -- type of the formal with the internal subtype. | |
7324bf49 | 9185 | |
0791fbe9 | 9186 | if Ada_Version >= Ada_2005 |
41251c60 | 9187 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 9188 | then |
ec4867fa | 9189 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 9190 | Error_Msg_N |
0a36105d JM |
9191 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
9192 | ||
ec4867fa ES |
9193 | else |
9194 | if Can_Never_Be_Null (Formal_Type) | |
9195 | and then Comes_From_Source (Related_Nod) | |
9196 | then | |
ed2233dc | 9197 | Error_Msg_NE |
0a36105d | 9198 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 9199 | Param_Spec, Formal_Type); |
ec4867fa | 9200 | end if; |
41251c60 | 9201 | |
ec4867fa ES |
9202 | Formal_Type := |
9203 | Create_Null_Excluding_Itype | |
9204 | (T => Formal_Type, | |
9205 | Related_Nod => Related_Nod, | |
9206 | Scope_Id => Scope (Current_Scope)); | |
0a36105d JM |
9207 | |
9208 | -- If the designated type of the itype is an itype we | |
9209 | -- decorate it with the Has_Delayed_Freeze attribute to | |
9210 | -- avoid problems with the backend. | |
9211 | ||
9212 | -- Example: | |
9213 | -- type T is access procedure; | |
9214 | -- procedure Op (O : not null T); | |
9215 | ||
9216 | if Is_Itype (Directly_Designated_Type (Formal_Type)) then | |
9217 | Set_Has_Delayed_Freeze (Formal_Type); | |
9218 | end if; | |
ec4867fa | 9219 | end if; |
7324bf49 AC |
9220 | end if; |
9221 | ||
996ae0b0 RK |
9222 | -- An access formal type |
9223 | ||
9224 | else | |
9225 | Formal_Type := | |
9226 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 9227 | |
f937473f RD |
9228 | -- No need to continue if we already notified errors |
9229 | ||
9230 | if not Present (Formal_Type) then | |
9231 | return; | |
9232 | end if; | |
9233 | ||
0ab80019 | 9234 | -- Ada 2005 (AI-254) |
7324bf49 | 9235 | |
af4b9434 AC |
9236 | declare |
9237 | AD : constant Node_Id := | |
9238 | Access_To_Subprogram_Definition | |
9239 | (Parameter_Type (Param_Spec)); | |
9240 | begin | |
9241 | if Present (AD) and then Protected_Present (AD) then | |
9242 | Formal_Type := | |
9243 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 9244 | (Param_Spec); |
af4b9434 AC |
9245 | end if; |
9246 | end; | |
996ae0b0 RK |
9247 | end if; |
9248 | ||
9249 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 9250 | |
fecbd779 AC |
9251 | -- Deal with default expression if present |
9252 | ||
fbf5a39b | 9253 | Default := Expression (Param_Spec); |
996ae0b0 RK |
9254 | |
9255 | if Present (Default) then | |
2ba431e5 | 9256 | Check_SPARK_Restriction |
fe5d3068 | 9257 | ("default expression is not allowed", Default); |
38171f43 | 9258 | |
996ae0b0 | 9259 | if Out_Present (Param_Spec) then |
ed2233dc | 9260 | Error_Msg_N |
996ae0b0 RK |
9261 | ("default initialization only allowed for IN parameters", |
9262 | Param_Spec); | |
9263 | end if; | |
9264 | ||
9265 | -- Do the special preanalysis of the expression (see section on | |
9266 | -- "Handling of Default Expressions" in the spec of package Sem). | |
9267 | ||
21d27997 | 9268 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 9269 | |
f29b857f ES |
9270 | -- An access to constant cannot be the default for |
9271 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
9272 | |
9273 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
9274 | and then not Is_Access_Constant (Formal_Type) | |
9275 | and then Is_Access_Type (Etype (Default)) | |
9276 | and then Is_Access_Constant (Etype (Default)) | |
9277 | then | |
f29b857f ES |
9278 | Error_Msg_N |
9279 | ("formal that is access to variable cannot be initialized " & | |
9280 | "with an access-to-constant expression", Default); | |
2eb160f2 ST |
9281 | end if; |
9282 | ||
d8db0bca JM |
9283 | -- Check that the designated type of an access parameter's default |
9284 | -- is not a class-wide type unless the parameter's designated type | |
9285 | -- is also class-wide. | |
996ae0b0 RK |
9286 | |
9287 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
950d217a | 9288 | and then not Designates_From_With_Type (Formal_Type) |
07fc65c4 | 9289 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
9290 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
9291 | then | |
07fc65c4 GB |
9292 | Error_Msg_N |
9293 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 9294 | end if; |
4755cce9 JM |
9295 | |
9296 | -- Check incorrect use of dynamically tagged expressions | |
9297 | ||
9298 | if Is_Tagged_Type (Formal_Type) then | |
9299 | Check_Dynamically_Tagged_Expression | |
9300 | (Expr => Default, | |
9301 | Typ => Formal_Type, | |
9302 | Related_Nod => Default); | |
9303 | end if; | |
996ae0b0 RK |
9304 | end if; |
9305 | ||
41251c60 JM |
9306 | -- Ada 2005 (AI-231): Static checks |
9307 | ||
0791fbe9 | 9308 | if Ada_Version >= Ada_2005 |
41251c60 JM |
9309 | and then Is_Access_Type (Etype (Formal)) |
9310 | and then Can_Never_Be_Null (Etype (Formal)) | |
9311 | then | |
9312 | Null_Exclusion_Static_Checks (Param_Spec); | |
9313 | end if; | |
9314 | ||
996ae0b0 RK |
9315 | <<Continue>> |
9316 | Next (Param_Spec); | |
9317 | end loop; | |
9318 | ||
82c80734 RD |
9319 | -- If this is the formal part of a function specification, analyze the |
9320 | -- subtype mark in the context where the formals are visible but not | |
9321 | -- yet usable, and may hide outer homographs. | |
9322 | ||
9323 | if Nkind (Related_Nod) = N_Function_Specification then | |
9324 | Analyze_Return_Type (Related_Nod); | |
9325 | end if; | |
9326 | ||
996ae0b0 RK |
9327 | -- Now set the kind (mode) of each formal |
9328 | ||
9329 | Param_Spec := First (T); | |
996ae0b0 RK |
9330 | while Present (Param_Spec) loop |
9331 | Formal := Defining_Identifier (Param_Spec); | |
9332 | Set_Formal_Mode (Formal); | |
9333 | ||
9334 | if Ekind (Formal) = E_In_Parameter then | |
9335 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
9336 | ||
9337 | if Present (Expression (Param_Spec)) then | |
9338 | Default := Expression (Param_Spec); | |
9339 | ||
9340 | if Is_Scalar_Type (Etype (Default)) then | |
9341 | if Nkind | |
9342 | (Parameter_Type (Param_Spec)) /= N_Access_Definition | |
9343 | then | |
9344 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
9345 | ||
9346 | else | |
9347 | Formal_Type := Access_Definition | |
9348 | (Related_Nod, Parameter_Type (Param_Spec)); | |
9349 | end if; | |
9350 | ||
9351 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
9352 | end if; | |
2820d220 | 9353 | end if; |
800621e0 RD |
9354 | |
9355 | elsif Ekind (Formal) = E_Out_Parameter then | |
9356 | Num_Out_Params := Num_Out_Params + 1; | |
9357 | ||
9358 | if Num_Out_Params = 1 then | |
9359 | First_Out_Param := Formal; | |
9360 | end if; | |
9361 | ||
9362 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
9363 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
9364 | end if; |
9365 | ||
fecbd779 AC |
9366 | -- Force call by reference if aliased |
9367 | ||
9368 | if Is_Aliased (Formal) then | |
9369 | Set_Mechanism (Formal, By_Reference); | |
9370 | end if; | |
9371 | ||
996ae0b0 RK |
9372 | Next (Param_Spec); |
9373 | end loop; | |
800621e0 RD |
9374 | |
9375 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
9376 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
9377 | end if; | |
996ae0b0 RK |
9378 | end Process_Formals; |
9379 | ||
21d27997 RD |
9380 | ------------------ |
9381 | -- Process_PPCs -- | |
9382 | ------------------ | |
9383 | ||
9384 | procedure Process_PPCs | |
9385 | (N : Node_Id; | |
9386 | Spec_Id : Entity_Id; | |
9387 | Body_Id : Entity_Id) | |
9388 | is | |
9389 | Loc : constant Source_Ptr := Sloc (N); | |
9390 | Prag : Node_Id; | |
21d27997 RD |
9391 | Parms : List_Id; |
9392 | ||
e606088a AC |
9393 | Designator : Entity_Id; |
9394 | -- Subprogram designator, set from Spec_Id if present, else Body_Id | |
9395 | ||
beacce02 AC |
9396 | Precond : Node_Id := Empty; |
9397 | -- Set non-Empty if we prepend precondition to the declarations. This | |
9398 | -- is used to hook up inherited preconditions (adding the condition | |
9399 | -- expression with OR ELSE, and adding the message). | |
9400 | ||
9401 | Inherited_Precond : Node_Id; | |
9402 | -- Precondition inherited from parent subprogram | |
9403 | ||
9404 | Inherited : constant Subprogram_List := | |
e606088a AC |
9405 | Inherited_Subprograms (Spec_Id); |
9406 | -- List of subprograms inherited by this subprogram | |
beacce02 AC |
9407 | |
9408 | Plist : List_Id := No_List; | |
9409 | -- List of generated postconditions | |
9410 | ||
f0709ca6 AC |
9411 | function Grab_PPC (Pspec : Entity_Id := Empty) return Node_Id; |
9412 | -- Prag contains an analyzed precondition or postcondition pragma. This | |
9413 | -- function copies the pragma, changes it to the corresponding Check | |
9414 | -- pragma and returns the Check pragma as the result. If Pspec is non- | |
9415 | -- empty, this is the case of inheriting a PPC, where we must change | |
9416 | -- references to parameters of the inherited subprogram to point to the | |
9417 | -- corresponding parameters of the current subprogram. | |
21d27997 | 9418 | |
b4ca2d2c AC |
9419 | function Invariants_Or_Predicates_Present return Boolean; |
9420 | -- Determines if any invariants or predicates are present for any OUT | |
9421 | -- or IN OUT parameters of the subprogram, or (for a function) if the | |
9422 | -- return value has an invariant. | |
e606088a | 9423 | |
21d27997 RD |
9424 | -------------- |
9425 | -- Grab_PPC -- | |
9426 | -------------- | |
9427 | ||
f0709ca6 AC |
9428 | function Grab_PPC (Pspec : Entity_Id := Empty) return Node_Id is |
9429 | Nam : constant Name_Id := Pragma_Name (Prag); | |
9430 | Map : Elist_Id; | |
9431 | CP : Node_Id; | |
21d27997 RD |
9432 | |
9433 | begin | |
f0709ca6 AC |
9434 | -- Prepare map if this is the case where we have to map entities of |
9435 | -- arguments in the overridden subprogram to corresponding entities | |
9436 | -- of the current subprogram. | |
9437 | ||
9438 | if No (Pspec) then | |
9439 | Map := No_Elist; | |
9440 | ||
9441 | else | |
9442 | declare | |
9443 | PF : Entity_Id; | |
9444 | CF : Entity_Id; | |
9445 | ||
9446 | begin | |
9447 | Map := New_Elmt_List; | |
9448 | PF := First_Formal (Pspec); | |
e606088a | 9449 | CF := First_Formal (Designator); |
f0709ca6 AC |
9450 | while Present (PF) loop |
9451 | Append_Elmt (PF, Map); | |
9452 | Append_Elmt (CF, Map); | |
9453 | Next_Formal (PF); | |
9454 | Next_Formal (CF); | |
9455 | end loop; | |
9456 | end; | |
9457 | end if; | |
9458 | ||
308e6f3a | 9459 | -- Now we can copy the tree, doing any required substitutions |
f0709ca6 AC |
9460 | |
9461 | CP := New_Copy_Tree (Prag, Map => Map, New_Scope => Current_Scope); | |
9462 | ||
21d27997 RD |
9463 | -- Set Analyzed to false, since we want to reanalyze the check |
9464 | -- procedure. Note that it is only at the outer level that we | |
9465 | -- do this fiddling, for the spec cases, the already preanalyzed | |
9466 | -- parameters are not affected. | |
766d7add | 9467 | |
1fb00064 AC |
9468 | Set_Analyzed (CP, False); |
9469 | ||
9470 | -- We also make sure Comes_From_Source is False for the copy | |
9471 | ||
9472 | Set_Comes_From_Source (CP, False); | |
9473 | ||
0dabde3a ES |
9474 | -- For a postcondition pragma within a generic, preserve the pragma |
9475 | -- for later expansion. | |
21d27997 | 9476 | |
0dabde3a ES |
9477 | if Nam = Name_Postcondition |
9478 | and then not Expander_Active | |
9479 | then | |
9480 | return CP; | |
9481 | end if; | |
9482 | ||
1fb00064 | 9483 | -- Change copy of pragma into corresponding pragma Check |
21d27997 RD |
9484 | |
9485 | Prepend_To (Pragma_Argument_Associations (CP), | |
9486 | Make_Pragma_Argument_Association (Sloc (Prag), | |
7675ad4f AC |
9487 | Expression => Make_Identifier (Loc, Nam))); |
9488 | Set_Pragma_Identifier (CP, Make_Identifier (Sloc (Prag), Name_Check)); | |
21d27997 | 9489 | |
beacce02 AC |
9490 | -- If this is inherited case and the current message starts with |
9491 | -- "failed p", we change it to "failed inherited p...". | |
f0709ca6 AC |
9492 | |
9493 | if Present (Pspec) then | |
beacce02 AC |
9494 | declare |
9495 | Msg : constant Node_Id := | |
9496 | Last (Pragma_Argument_Associations (CP)); | |
9497 | ||
9498 | begin | |
9499 | if Chars (Msg) = Name_Message then | |
9500 | String_To_Name_Buffer (Strval (Expression (Msg))); | |
9501 | ||
9502 | if Name_Buffer (1 .. 8) = "failed p" then | |
9503 | Insert_Str_In_Name_Buffer ("inherited ", 8); | |
9504 | Set_Strval | |
9505 | (Expression (Last (Pragma_Argument_Associations (CP))), | |
9506 | String_From_Name_Buffer); | |
9507 | end if; | |
9508 | end if; | |
9509 | end; | |
f0709ca6 AC |
9510 | end if; |
9511 | ||
9512 | -- Return the check pragma | |
9513 | ||
21d27997 RD |
9514 | return CP; |
9515 | end Grab_PPC; | |
9516 | ||
b4ca2d2c AC |
9517 | -------------------------------------- |
9518 | -- Invariants_Or_Predicates_Present -- | |
9519 | -------------------------------------- | |
e606088a | 9520 | |
b4ca2d2c AC |
9521 | function Invariants_Or_Predicates_Present return Boolean is |
9522 | Formal : Entity_Id; | |
e606088a AC |
9523 | |
9524 | begin | |
9525 | -- Check function return result | |
9526 | ||
9527 | if Ekind (Designator) /= E_Procedure | |
9528 | and then Has_Invariants (Etype (Designator)) | |
9529 | then | |
9530 | return True; | |
9531 | end if; | |
9532 | ||
9533 | -- Check parameters | |
9534 | ||
9535 | Formal := First_Formal (Designator); | |
9536 | while Present (Formal) loop | |
9537 | if Ekind (Formal) /= E_In_Parameter | |
b4ca2d2c AC |
9538 | and then |
9539 | (Has_Invariants (Etype (Formal)) | |
9540 | or else Present (Predicate_Function (Etype (Formal)))) | |
e606088a AC |
9541 | then |
9542 | return True; | |
9543 | end if; | |
9544 | ||
9545 | Next_Formal (Formal); | |
9546 | end loop; | |
9547 | ||
9548 | return False; | |
b4ca2d2c | 9549 | end Invariants_Or_Predicates_Present; |
e606088a | 9550 | |
21d27997 RD |
9551 | -- Start of processing for Process_PPCs |
9552 | ||
9553 | begin | |
e606088a AC |
9554 | -- Capture designator from spec if present, else from body |
9555 | ||
9556 | if Present (Spec_Id) then | |
9557 | Designator := Spec_Id; | |
9558 | else | |
9559 | Designator := Body_Id; | |
9560 | end if; | |
9561 | ||
21d27997 RD |
9562 | -- Grab preconditions from spec |
9563 | ||
9564 | if Present (Spec_Id) then | |
9565 | ||
9566 | -- Loop through PPC pragmas from spec. Note that preconditions from | |
9567 | -- the body will be analyzed and converted when we scan the body | |
9568 | -- declarations below. | |
9569 | ||
dac3bede | 9570 | Prag := Spec_PPC_List (Contract (Spec_Id)); |
21d27997 | 9571 | while Present (Prag) loop |
1fb00064 AC |
9572 | if Pragma_Name (Prag) = Name_Precondition then |
9573 | ||
beacce02 AC |
9574 | -- For Pre (or Precondition pragma), we simply prepend the |
9575 | -- pragma to the list of declarations right away so that it | |
9576 | -- will be executed at the start of the procedure. Note that | |
9577 | -- this processing reverses the order of the list, which is | |
9578 | -- what we want since new entries were chained to the head of | |
2d395256 AC |
9579 | -- the list. There can be more than one precondition when we |
9580 | -- use pragma Precondition. | |
beacce02 AC |
9581 | |
9582 | if not Class_Present (Prag) then | |
9583 | Prepend (Grab_PPC, Declarations (N)); | |
9584 | ||
9585 | -- For Pre'Class there can only be one pragma, and we save | |
9586 | -- it in Precond for now. We will add inherited Pre'Class | |
9587 | -- stuff before inserting this pragma in the declarations. | |
9588 | else | |
9589 | Precond := Grab_PPC; | |
9590 | end if; | |
21d27997 RD |
9591 | end if; |
9592 | ||
9593 | Prag := Next_Pragma (Prag); | |
9594 | end loop; | |
beacce02 AC |
9595 | |
9596 | -- Now deal with inherited preconditions | |
9597 | ||
9598 | for J in Inherited'Range loop | |
dac3bede | 9599 | Prag := Spec_PPC_List (Contract (Inherited (J))); |
beacce02 AC |
9600 | |
9601 | while Present (Prag) loop | |
9602 | if Pragma_Name (Prag) = Name_Precondition | |
9603 | and then Class_Present (Prag) | |
9604 | then | |
3c971dcc | 9605 | Inherited_Precond := Grab_PPC (Inherited (J)); |
beacce02 AC |
9606 | |
9607 | -- No precondition so far, so establish this as the first | |
9608 | ||
9609 | if No (Precond) then | |
9610 | Precond := Inherited_Precond; | |
9611 | ||
9612 | -- Here we already have a precondition, add inherited one | |
9613 | ||
9614 | else | |
9615 | -- Add new precondition to old one using OR ELSE | |
9616 | ||
9617 | declare | |
9618 | New_Expr : constant Node_Id := | |
9619 | Get_Pragma_Arg | |
9620 | (Next | |
9621 | (First | |
9622 | (Pragma_Argument_Associations | |
9623 | (Inherited_Precond)))); | |
9624 | Old_Expr : constant Node_Id := | |
9625 | Get_Pragma_Arg | |
9626 | (Next | |
9627 | (First | |
9628 | (Pragma_Argument_Associations | |
9629 | (Precond)))); | |
9630 | ||
9631 | begin | |
9632 | if Paren_Count (Old_Expr) = 0 then | |
9633 | Set_Paren_Count (Old_Expr, 1); | |
9634 | end if; | |
9635 | ||
9636 | if Paren_Count (New_Expr) = 0 then | |
9637 | Set_Paren_Count (New_Expr, 1); | |
9638 | end if; | |
9639 | ||
9640 | Rewrite (Old_Expr, | |
9641 | Make_Or_Else (Sloc (Old_Expr), | |
9642 | Left_Opnd => Relocate_Node (Old_Expr), | |
9643 | Right_Opnd => New_Expr)); | |
9644 | end; | |
9645 | ||
9646 | -- Add new message in the form: | |
9647 | ||
9648 | -- failed precondition from bla | |
9649 | -- also failed inherited precondition from bla | |
9650 | -- ... | |
9651 | ||
3c971dcc AC |
9652 | -- Skip this if exception locations are suppressed |
9653 | ||
9654 | if not Exception_Locations_Suppressed then | |
9655 | declare | |
9656 | New_Msg : constant Node_Id := | |
9657 | Get_Pragma_Arg | |
9658 | (Last | |
9659 | (Pragma_Argument_Associations | |
9660 | (Inherited_Precond))); | |
9661 | Old_Msg : constant Node_Id := | |
9662 | Get_Pragma_Arg | |
9663 | (Last | |
9664 | (Pragma_Argument_Associations | |
9665 | (Precond))); | |
9666 | begin | |
9667 | Start_String (Strval (Old_Msg)); | |
9668 | Store_String_Chars (ASCII.LF & " also "); | |
9669 | Store_String_Chars (Strval (New_Msg)); | |
9670 | Set_Strval (Old_Msg, End_String); | |
9671 | end; | |
9672 | end if; | |
beacce02 AC |
9673 | end if; |
9674 | end if; | |
9675 | ||
9676 | Prag := Next_Pragma (Prag); | |
9677 | end loop; | |
9678 | end loop; | |
9679 | ||
9680 | -- If we have built a precondition for Pre'Class (including any | |
9681 | -- Pre'Class aspects inherited from parent subprograms), then we | |
9682 | -- insert this composite precondition at this stage. | |
9683 | ||
9684 | if Present (Precond) then | |
9685 | Prepend (Precond, Declarations (N)); | |
9686 | end if; | |
21d27997 RD |
9687 | end if; |
9688 | ||
9689 | -- Build postconditions procedure if needed and prepend the following | |
9690 | -- declaration to the start of the declarations for the subprogram. | |
9691 | ||
9692 | -- procedure _postconditions [(_Result : resulttype)] is | |
9693 | -- begin | |
9694 | -- pragma Check (Postcondition, condition [,message]); | |
9695 | -- pragma Check (Postcondition, condition [,message]); | |
9696 | -- ... | |
e606088a AC |
9697 | -- Invariant_Procedure (_Result) ... |
9698 | -- Invariant_Procedure (Arg1) | |
9699 | -- ... | |
21d27997 RD |
9700 | -- end; |
9701 | ||
9702 | -- First we deal with the postconditions in the body | |
9703 | ||
9704 | if Is_Non_Empty_List (Declarations (N)) then | |
9705 | ||
9706 | -- Loop through declarations | |
9707 | ||
9708 | Prag := First (Declarations (N)); | |
9709 | while Present (Prag) loop | |
9710 | if Nkind (Prag) = N_Pragma then | |
9711 | ||
9712 | -- If pragma, capture if enabled postcondition, else ignore | |
9713 | ||
9714 | if Pragma_Name (Prag) = Name_Postcondition | |
9715 | and then Check_Enabled (Name_Postcondition) | |
9716 | then | |
9717 | if Plist = No_List then | |
9718 | Plist := Empty_List; | |
9719 | end if; | |
9720 | ||
9721 | Analyze (Prag); | |
0dabde3a | 9722 | |
f0709ca6 AC |
9723 | -- If expansion is disabled, as in a generic unit, save |
9724 | -- pragma for later expansion. | |
0dabde3a ES |
9725 | |
9726 | if not Expander_Active then | |
f0709ca6 | 9727 | Prepend (Grab_PPC, Declarations (N)); |
0dabde3a | 9728 | else |
f0709ca6 | 9729 | Append (Grab_PPC, Plist); |
0dabde3a | 9730 | end if; |
21d27997 RD |
9731 | end if; |
9732 | ||
9733 | Next (Prag); | |
9734 | ||
043ce308 | 9735 | -- Not a pragma, if comes from source, then end scan |
21d27997 RD |
9736 | |
9737 | elsif Comes_From_Source (Prag) then | |
9738 | exit; | |
9739 | ||
043ce308 | 9740 | -- Skip stuff not coming from source |
21d27997 RD |
9741 | |
9742 | else | |
9743 | Next (Prag); | |
9744 | end if; | |
9745 | end loop; | |
9746 | end if; | |
9747 | ||
9748 | -- Now deal with any postconditions from the spec | |
9749 | ||
9750 | if Present (Spec_Id) then | |
e606088a | 9751 | Spec_Postconditions : declare |
f0709ca6 AC |
9752 | procedure Process_Post_Conditions |
9753 | (Spec : Node_Id; | |
9754 | Class : Boolean); | |
9755 | -- This processes the Spec_PPC_List from Spec, processing any | |
9756 | -- postconditions from the list. If Class is True, then only | |
9757 | -- postconditions marked with Class_Present are considered. | |
9758 | -- The caller has checked that Spec_PPC_List is non-Empty. | |
9759 | ||
9760 | ----------------------------- | |
9761 | -- Process_Post_Conditions -- | |
9762 | ----------------------------- | |
9763 | ||
9764 | procedure Process_Post_Conditions | |
9765 | (Spec : Node_Id; | |
9766 | Class : Boolean) | |
9767 | is | |
9768 | Pspec : Node_Id; | |
21d27997 | 9769 | |
f0709ca6 AC |
9770 | begin |
9771 | if Class then | |
9772 | Pspec := Spec; | |
0dabde3a | 9773 | else |
f0709ca6 | 9774 | Pspec := Empty; |
0dabde3a | 9775 | end if; |
f0709ca6 AC |
9776 | |
9777 | -- Loop through PPC pragmas from spec | |
9778 | ||
dac3bede | 9779 | Prag := Spec_PPC_List (Contract (Spec)); |
f0709ca6 AC |
9780 | loop |
9781 | if Pragma_Name (Prag) = Name_Postcondition | |
f0709ca6 AC |
9782 | and then (not Class or else Class_Present (Prag)) |
9783 | then | |
9784 | if Plist = No_List then | |
9785 | Plist := Empty_List; | |
9786 | end if; | |
9787 | ||
9788 | if not Expander_Active then | |
9789 | Prepend | |
9790 | (Grab_PPC (Pspec), Declarations (N)); | |
9791 | else | |
9792 | Append (Grab_PPC (Pspec), Plist); | |
9793 | end if; | |
9794 | end if; | |
9795 | ||
9796 | Prag := Next_Pragma (Prag); | |
9797 | exit when No (Prag); | |
9798 | end loop; | |
9799 | end Process_Post_Conditions; | |
9800 | ||
e606088a AC |
9801 | -- Start of processing for Spec_Postconditions |
9802 | ||
f0709ca6 | 9803 | begin |
dac3bede | 9804 | if Present (Spec_PPC_List (Contract (Spec_Id))) then |
f0709ca6 | 9805 | Process_Post_Conditions (Spec_Id, Class => False); |
21d27997 RD |
9806 | end if; |
9807 | ||
beacce02 | 9808 | -- Process inherited postconditions |
f0709ca6 | 9809 | |
beacce02 | 9810 | for J in Inherited'Range loop |
dac3bede | 9811 | if Present (Spec_PPC_List (Contract (Inherited (J)))) then |
beacce02 | 9812 | Process_Post_Conditions (Inherited (J), Class => True); |
f0709ca6 AC |
9813 | end if; |
9814 | end loop; | |
e606088a | 9815 | end Spec_Postconditions; |
21d27997 RD |
9816 | end if; |
9817 | ||
e606088a AC |
9818 | -- If we had any postconditions and expansion is enabled, or if the |
9819 | -- procedure has invariants, then build the _Postconditions procedure. | |
21d27997 | 9820 | |
b4ca2d2c | 9821 | if (Present (Plist) or else Invariants_Or_Predicates_Present) |
0dabde3a ES |
9822 | and then Expander_Active |
9823 | then | |
e606088a AC |
9824 | if No (Plist) then |
9825 | Plist := Empty_List; | |
9826 | end if; | |
9827 | ||
9828 | -- Special processing for function case | |
9829 | ||
9830 | if Ekind (Designator) /= E_Procedure then | |
9831 | declare | |
9832 | Rent : constant Entity_Id := | |
fecbd779 | 9833 | Make_Defining_Identifier (Loc, Name_uResult); |
e606088a AC |
9834 | Ftyp : constant Entity_Id := Etype (Designator); |
9835 | ||
9836 | begin | |
9837 | Set_Etype (Rent, Ftyp); | |
9838 | ||
9839 | -- Add argument for return | |
9840 | ||
9841 | Parms := | |
9842 | New_List ( | |
9843 | Make_Parameter_Specification (Loc, | |
9844 | Parameter_Type => New_Occurrence_Of (Ftyp, Loc), | |
9845 | Defining_Identifier => Rent)); | |
9846 | ||
9847 | -- Add invariant call if returning type with invariants | |
9848 | ||
fd0ff1cf RD |
9849 | if Has_Invariants (Etype (Rent)) |
9850 | and then Present (Invariant_Procedure (Etype (Rent))) | |
9851 | then | |
e606088a AC |
9852 | Append_To (Plist, |
9853 | Make_Invariant_Call (New_Occurrence_Of (Rent, Loc))); | |
9854 | end if; | |
9855 | end; | |
9856 | ||
9857 | -- Procedure rather than a function | |
21d27997 | 9858 | |
21d27997 RD |
9859 | else |
9860 | Parms := No_List; | |
9861 | end if; | |
9862 | ||
b4ca2d2c AC |
9863 | -- Add invariant calls and predicate calls for parameters. Note that |
9864 | -- this is done for functions as well, since in Ada 2012 they can | |
9865 | -- have IN OUT args. | |
e606088a AC |
9866 | |
9867 | declare | |
9868 | Formal : Entity_Id; | |
b4ca2d2c | 9869 | Ftype : Entity_Id; |
e606088a AC |
9870 | |
9871 | begin | |
9872 | Formal := First_Formal (Designator); | |
9873 | while Present (Formal) loop | |
b4ca2d2c AC |
9874 | if Ekind (Formal) /= E_In_Parameter then |
9875 | Ftype := Etype (Formal); | |
9876 | ||
9877 | if Has_Invariants (Ftype) | |
9878 | and then Present (Invariant_Procedure (Ftype)) | |
9879 | then | |
9880 | Append_To (Plist, | |
9881 | Make_Invariant_Call | |
9882 | (New_Occurrence_Of (Formal, Loc))); | |
9883 | end if; | |
9884 | ||
9885 | if Present (Predicate_Function (Ftype)) then | |
9886 | Append_To (Plist, | |
9887 | Make_Predicate_Check | |
9888 | (Ftype, New_Occurrence_Of (Formal, Loc))); | |
9889 | end if; | |
e606088a AC |
9890 | end if; |
9891 | ||
9892 | Next_Formal (Formal); | |
9893 | end loop; | |
9894 | end; | |
9895 | ||
9896 | -- Build and insert postcondition procedure | |
9897 | ||
043ce308 AC |
9898 | declare |
9899 | Post_Proc : constant Entity_Id := | |
e606088a AC |
9900 | Make_Defining_Identifier (Loc, |
9901 | Chars => Name_uPostconditions); | |
043ce308 | 9902 | -- The entity for the _Postconditions procedure |
f0709ca6 | 9903 | |
043ce308 | 9904 | begin |
043ce308 AC |
9905 | Prepend_To (Declarations (N), |
9906 | Make_Subprogram_Body (Loc, | |
9907 | Specification => | |
9908 | Make_Procedure_Specification (Loc, | |
9909 | Defining_Unit_Name => Post_Proc, | |
9910 | Parameter_Specifications => Parms), | |
9911 | ||
9912 | Declarations => Empty_List, | |
9913 | ||
9914 | Handled_Statement_Sequence => | |
9915 | Make_Handled_Sequence_Of_Statements (Loc, | |
9916 | Statements => Plist))); | |
21d27997 | 9917 | |
5ffe0bab | 9918 | Set_Ekind (Post_Proc, E_Procedure); |
5ffe0bab | 9919 | |
3bb3f6d6 AC |
9920 | -- If this is a procedure, set the Postcondition_Proc attribute on |
9921 | -- the proper defining entity for the subprogram. | |
21d27997 | 9922 | |
e606088a AC |
9923 | if Ekind (Designator) = E_Procedure then |
9924 | Set_Postcondition_Proc (Designator, Post_Proc); | |
043ce308 AC |
9925 | end if; |
9926 | end; | |
21d27997 | 9927 | |
e606088a | 9928 | Set_Has_Postconditions (Designator); |
21d27997 RD |
9929 | end if; |
9930 | end Process_PPCs; | |
9931 | ||
fbf5a39b AC |
9932 | ---------------------------- |
9933 | -- Reference_Body_Formals -- | |
9934 | ---------------------------- | |
9935 | ||
9936 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
9937 | Fs : Entity_Id; | |
9938 | Fb : Entity_Id; | |
9939 | ||
9940 | begin | |
9941 | if Error_Posted (Spec) then | |
9942 | return; | |
9943 | end if; | |
9944 | ||
0a36105d JM |
9945 | -- Iterate over both lists. They may be of different lengths if the two |
9946 | -- specs are not conformant. | |
9947 | ||
fbf5a39b AC |
9948 | Fs := First_Formal (Spec); |
9949 | Fb := First_Formal (Bod); | |
0a36105d | 9950 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
9951 | Generate_Reference (Fs, Fb, 'b'); |
9952 | ||
9953 | if Style_Check then | |
9954 | Style.Check_Identifier (Fb, Fs); | |
9955 | end if; | |
9956 | ||
9957 | Set_Spec_Entity (Fb, Fs); | |
9958 | Set_Referenced (Fs, False); | |
9959 | Next_Formal (Fs); | |
9960 | Next_Formal (Fb); | |
9961 | end loop; | |
9962 | end Reference_Body_Formals; | |
9963 | ||
996ae0b0 RK |
9964 | ------------------------- |
9965 | -- Set_Actual_Subtypes -- | |
9966 | ------------------------- | |
9967 | ||
9968 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
2820d220 AC |
9969 | Decl : Node_Id; |
9970 | Formal : Entity_Id; | |
9971 | T : Entity_Id; | |
9972 | First_Stmt : Node_Id := Empty; | |
9973 | AS_Needed : Boolean; | |
996ae0b0 RK |
9974 | |
9975 | begin | |
f3d57416 | 9976 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
9977 | -- actual subtypes (small optimization). |
9978 | ||
9979 | if Ekind (Subp) = E_Procedure | |
9980 | and then Is_Null_Init_Proc (Subp) | |
9981 | then | |
9982 | return; | |
9983 | end if; | |
9984 | ||
996ae0b0 RK |
9985 | Formal := First_Formal (Subp); |
9986 | while Present (Formal) loop | |
9987 | T := Etype (Formal); | |
9988 | ||
e895b435 | 9989 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
9990 | |
9991 | if Is_Constrained (T) then | |
9992 | AS_Needed := False; | |
9993 | ||
82c80734 RD |
9994 | -- If we have unknown discriminants, then we do not need an actual |
9995 | -- subtype, or more accurately we cannot figure it out! Note that | |
9996 | -- all class-wide types have unknown discriminants. | |
996ae0b0 RK |
9997 | |
9998 | elsif Has_Unknown_Discriminants (T) then | |
9999 | AS_Needed := False; | |
10000 | ||
82c80734 RD |
10001 | -- At this stage we have an unconstrained type that may need an |
10002 | -- actual subtype. For sure the actual subtype is needed if we have | |
10003 | -- an unconstrained array type. | |
996ae0b0 RK |
10004 | |
10005 | elsif Is_Array_Type (T) then | |
10006 | AS_Needed := True; | |
10007 | ||
d8db0bca JM |
10008 | -- The only other case needing an actual subtype is an unconstrained |
10009 | -- record type which is an IN parameter (we cannot generate actual | |
10010 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
10011 | -- change the discriminant values. However we exclude the case of | |
10012 | -- initialization procedures, since discriminants are handled very | |
10013 | -- specially in this context, see the section entitled "Handling of | |
10014 | -- Discriminants" in Einfo. | |
10015 | ||
10016 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
10017 | -- in front end layout mode for size/offset values), since in such | |
10018 | -- functions only discriminants are referenced, and not only are such | |
10019 | -- subtypes not needed, but they cannot always be generated, because | |
10020 | -- of order of elaboration issues. | |
996ae0b0 RK |
10021 | |
10022 | elsif Is_Record_Type (T) | |
10023 | and then Ekind (Formal) = E_In_Parameter | |
10024 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 10025 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
10026 | and then not Is_Discrim_SO_Function (Subp) |
10027 | then | |
10028 | AS_Needed := True; | |
10029 | ||
10030 | -- All other cases do not need an actual subtype | |
10031 | ||
10032 | else | |
10033 | AS_Needed := False; | |
10034 | end if; | |
10035 | ||
10036 | -- Generate actual subtypes for unconstrained arrays and | |
10037 | -- unconstrained discriminated records. | |
10038 | ||
10039 | if AS_Needed then | |
7324bf49 | 10040 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 10041 | |
57a8057a | 10042 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
10043 | -- variable that renames the corresponding entry of the |
10044 | -- parameter block, and it is this local variable that may | |
da94696d | 10045 | -- require an actual subtype. |
fbf5a39b | 10046 | |
da94696d | 10047 | if Full_Expander_Active then |
fbf5a39b AC |
10048 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
10049 | else | |
10050 | Decl := Build_Actual_Subtype (T, Formal); | |
10051 | end if; | |
10052 | ||
996ae0b0 RK |
10053 | if Present (Handled_Statement_Sequence (N)) then |
10054 | First_Stmt := | |
10055 | First (Statements (Handled_Statement_Sequence (N))); | |
10056 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
10057 | Mark_Rewrite_Insertion (Decl); | |
10058 | else | |
82c80734 RD |
10059 | -- If the accept statement has no body, there will be no |
10060 | -- reference to the actuals, so no need to compute actual | |
10061 | -- subtypes. | |
996ae0b0 RK |
10062 | |
10063 | return; | |
10064 | end if; | |
10065 | ||
10066 | else | |
fbf5a39b | 10067 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
10068 | Prepend (Decl, Declarations (N)); |
10069 | Mark_Rewrite_Insertion (Decl); | |
10070 | end if; | |
10071 | ||
82c80734 RD |
10072 | -- The declaration uses the bounds of an existing object, and |
10073 | -- therefore needs no constraint checks. | |
2820d220 | 10074 | |
7324bf49 | 10075 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 10076 | |
996ae0b0 RK |
10077 | -- We need to freeze manually the generated type when it is |
10078 | -- inserted anywhere else than in a declarative part. | |
10079 | ||
10080 | if Present (First_Stmt) then | |
10081 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 10082 | Freeze_Entity (Defining_Identifier (Decl), N)); |
996ae0b0 RK |
10083 | end if; |
10084 | ||
fbf5a39b | 10085 | if Nkind (N) = N_Accept_Statement |
da94696d | 10086 | and then Full_Expander_Active |
fbf5a39b AC |
10087 | then |
10088 | Set_Actual_Subtype (Renamed_Object (Formal), | |
10089 | Defining_Identifier (Decl)); | |
10090 | else | |
10091 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
10092 | end if; | |
996ae0b0 RK |
10093 | end if; |
10094 | ||
10095 | Next_Formal (Formal); | |
10096 | end loop; | |
10097 | end Set_Actual_Subtypes; | |
10098 | ||
10099 | --------------------- | |
10100 | -- Set_Formal_Mode -- | |
10101 | --------------------- | |
10102 | ||
10103 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
10104 | Spec : constant Node_Id := Parent (Formal_Id); | |
10105 | ||
10106 | begin | |
10107 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
10108 | -- since we ensure that corresponding actuals are always valid at the | |
10109 | -- point of the call. | |
10110 | ||
10111 | if Out_Present (Spec) then | |
996ae0b0 RK |
10112 | if Ekind (Scope (Formal_Id)) = E_Function |
10113 | or else Ekind (Scope (Formal_Id)) = E_Generic_Function | |
10114 | then | |
b4ca2d2c | 10115 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
10116 | |
10117 | if Ada_Version >= Ada_2012 then | |
10118 | if In_Present (Spec) then | |
10119 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10120 | else | |
10121 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
10122 | end if; | |
10123 | ||
b4ca2d2c AC |
10124 | -- But not in earlier versions of Ada |
10125 | ||
c56a9ba4 AC |
10126 | else |
10127 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
10128 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10129 | end if; | |
996ae0b0 RK |
10130 | |
10131 | elsif In_Present (Spec) then | |
10132 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10133 | ||
10134 | else | |
fbf5a39b AC |
10135 | Set_Ekind (Formal_Id, E_Out_Parameter); |
10136 | Set_Never_Set_In_Source (Formal_Id, True); | |
10137 | Set_Is_True_Constant (Formal_Id, False); | |
10138 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
10139 | end if; |
10140 | ||
10141 | else | |
10142 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10143 | end if; | |
10144 | ||
fbf5a39b | 10145 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
10146 | -- guarantees that access parameters are always non-null. We also set |
10147 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
10148 | |
10149 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 10150 | |
2813bb6b ES |
10151 | -- Ada 2005 (AI-231): In Ada95, access parameters are always non- |
10152 | -- null; In Ada 2005, only if then null_exclusion is explicit. | |
2820d220 | 10153 | |
0791fbe9 | 10154 | if Ada_Version < Ada_2005 |
2813bb6b | 10155 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
10156 | then |
10157 | Set_Is_Known_Non_Null (Formal_Id); | |
10158 | Set_Can_Never_Be_Null (Formal_Id); | |
10159 | end if; | |
2813bb6b | 10160 | |
41251c60 JM |
10161 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
10162 | ||
2813bb6b ES |
10163 | elsif Is_Access_Type (Etype (Formal_Id)) |
10164 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
10165 | then | |
2813bb6b | 10166 | Set_Is_Known_Non_Null (Formal_Id); |
fbf5a39b AC |
10167 | end if; |
10168 | ||
996ae0b0 RK |
10169 | Set_Mechanism (Formal_Id, Default_Mechanism); |
10170 | Set_Formal_Validity (Formal_Id); | |
10171 | end Set_Formal_Mode; | |
10172 | ||
10173 | ------------------------- | |
10174 | -- Set_Formal_Validity -- | |
10175 | ------------------------- | |
10176 | ||
10177 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
10178 | begin | |
82c80734 RD |
10179 | -- If no validity checking, then we cannot assume anything about the |
10180 | -- validity of parameters, since we do not know there is any checking | |
10181 | -- of the validity on the call side. | |
996ae0b0 RK |
10182 | |
10183 | if not Validity_Checks_On then | |
10184 | return; | |
10185 | ||
fbf5a39b AC |
10186 | -- If validity checking for parameters is enabled, this means we are |
10187 | -- not supposed to make any assumptions about argument values. | |
10188 | ||
10189 | elsif Validity_Check_Parameters then | |
10190 | return; | |
10191 | ||
10192 | -- If we are checking in parameters, we will assume that the caller is | |
10193 | -- also checking parameters, so we can assume the parameter is valid. | |
10194 | ||
996ae0b0 RK |
10195 | elsif Ekind (Formal_Id) = E_In_Parameter |
10196 | and then Validity_Check_In_Params | |
10197 | then | |
10198 | Set_Is_Known_Valid (Formal_Id, True); | |
10199 | ||
fbf5a39b AC |
10200 | -- Similar treatment for IN OUT parameters |
10201 | ||
996ae0b0 RK |
10202 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
10203 | and then Validity_Check_In_Out_Params | |
10204 | then | |
10205 | Set_Is_Known_Valid (Formal_Id, True); | |
10206 | end if; | |
10207 | end Set_Formal_Validity; | |
10208 | ||
10209 | ------------------------ | |
10210 | -- Subtype_Conformant -- | |
10211 | ------------------------ | |
10212 | ||
ce2b6ba5 JM |
10213 | function Subtype_Conformant |
10214 | (New_Id : Entity_Id; | |
10215 | Old_Id : Entity_Id; | |
10216 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10217 | is | |
996ae0b0 | 10218 | Result : Boolean; |
996ae0b0 | 10219 | begin |
ce2b6ba5 JM |
10220 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
10221 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10222 | return Result; |
10223 | end Subtype_Conformant; | |
10224 | ||
10225 | --------------------- | |
10226 | -- Type_Conformant -- | |
10227 | --------------------- | |
10228 | ||
41251c60 JM |
10229 | function Type_Conformant |
10230 | (New_Id : Entity_Id; | |
10231 | Old_Id : Entity_Id; | |
10232 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10233 | is | |
996ae0b0 | 10234 | Result : Boolean; |
996ae0b0 | 10235 | begin |
c8ef728f ES |
10236 | May_Hide_Profile := False; |
10237 | ||
41251c60 JM |
10238 | Check_Conformance |
10239 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
10240 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10241 | return Result; |
10242 | end Type_Conformant; | |
10243 | ||
10244 | ------------------------------- | |
10245 | -- Valid_Operator_Definition -- | |
10246 | ------------------------------- | |
10247 | ||
10248 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
10249 | N : Integer := 0; | |
10250 | F : Entity_Id; | |
10251 | Id : constant Name_Id := Chars (Designator); | |
10252 | N_OK : Boolean; | |
10253 | ||
10254 | begin | |
10255 | F := First_Formal (Designator); | |
996ae0b0 RK |
10256 | while Present (F) loop |
10257 | N := N + 1; | |
10258 | ||
10259 | if Present (Default_Value (F)) then | |
ed2233dc | 10260 | Error_Msg_N |
996ae0b0 RK |
10261 | ("default values not allowed for operator parameters", |
10262 | Parent (F)); | |
10263 | end if; | |
10264 | ||
10265 | Next_Formal (F); | |
10266 | end loop; | |
10267 | ||
10268 | -- Verify that user-defined operators have proper number of arguments | |
10269 | -- First case of operators which can only be unary | |
10270 | ||
10271 | if Id = Name_Op_Not | |
10272 | or else Id = Name_Op_Abs | |
10273 | then | |
10274 | N_OK := (N = 1); | |
10275 | ||
10276 | -- Case of operators which can be unary or binary | |
10277 | ||
10278 | elsif Id = Name_Op_Add | |
10279 | or Id = Name_Op_Subtract | |
10280 | then | |
10281 | N_OK := (N in 1 .. 2); | |
10282 | ||
10283 | -- All other operators can only be binary | |
10284 | ||
10285 | else | |
10286 | N_OK := (N = 2); | |
10287 | end if; | |
10288 | ||
10289 | if not N_OK then | |
10290 | Error_Msg_N | |
10291 | ("incorrect number of arguments for operator", Designator); | |
10292 | end if; | |
10293 | ||
10294 | if Id = Name_Op_Ne | |
10295 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
10296 | and then not Is_Intrinsic_Subprogram (Designator) | |
10297 | then | |
10298 | Error_Msg_N | |
10299 | ("explicit definition of inequality not allowed", Designator); | |
10300 | end if; | |
10301 | end Valid_Operator_Definition; | |
10302 | ||
10303 | end Sem_Ch6; |