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996ae0b0 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M _ C H 6 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
996ae0b0 | 8 | -- -- |
2c6336be | 9 | -- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- |
996ae0b0 RK |
10 | -- -- |
11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
996ae0b0 RK |
14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
17 | -- for more details. You should have received a copy of the GNU General -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
996ae0b0 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
996ae0b0 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
80e59506 | 26 | with Aspects; use Aspects; |
996ae0b0 RK |
27 | with Atree; use Atree; |
28 | with Checks; use Checks; | |
29 | with Debug; use Debug; | |
30 | with Einfo; use Einfo; | |
31 | with Elists; use Elists; | |
32 | with Errout; use Errout; | |
33 | with Expander; use Expander; | |
ec4867fa | 34 | with Exp_Ch6; use Exp_Ch6; |
996ae0b0 | 35 | with Exp_Ch7; use Exp_Ch7; |
21d27997 | 36 | with Exp_Ch9; use Exp_Ch9; |
616547fa | 37 | with Exp_Dbug; use Exp_Dbug; |
ce2b6ba5 | 38 | with Exp_Disp; use Exp_Disp; |
e660dbf7 | 39 | with Exp_Tss; use Exp_Tss; |
ec4867fa | 40 | with Exp_Util; use Exp_Util; |
fbf5a39b | 41 | with Fname; use Fname; |
996ae0b0 | 42 | with Freeze; use Freeze; |
8636f52f | 43 | with Ghost; use Ghost; |
540d8610 | 44 | with Inline; use Inline; |
41251c60 | 45 | with Itypes; use Itypes; |
996ae0b0 | 46 | with Lib.Xref; use Lib.Xref; |
ec4867fa | 47 | with Layout; use Layout; |
996ae0b0 RK |
48 | with Namet; use Namet; |
49 | with Lib; use Lib; | |
50 | with Nlists; use Nlists; | |
51 | with Nmake; use Nmake; | |
52 | with Opt; use Opt; | |
53 | with Output; use Output; | |
b20de9b9 AC |
54 | with Restrict; use Restrict; |
55 | with Rident; use Rident; | |
996ae0b0 RK |
56 | with Rtsfind; use Rtsfind; |
57 | with Sem; use Sem; | |
a4100e55 | 58 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
59 | with Sem_Cat; use Sem_Cat; |
60 | with Sem_Ch3; use Sem_Ch3; | |
61 | with Sem_Ch4; use Sem_Ch4; | |
62 | with Sem_Ch5; use Sem_Ch5; | |
63 | with Sem_Ch8; use Sem_Ch8; | |
9bc856dd | 64 | with Sem_Ch10; use Sem_Ch10; |
996ae0b0 | 65 | with Sem_Ch12; use Sem_Ch12; |
0f1a6a0b | 66 | with Sem_Ch13; use Sem_Ch13; |
dec6faf1 | 67 | with Sem_Dim; use Sem_Dim; |
996ae0b0 RK |
68 | with Sem_Disp; use Sem_Disp; |
69 | with Sem_Dist; use Sem_Dist; | |
70 | with Sem_Elim; use Sem_Elim; | |
71 | with Sem_Eval; use Sem_Eval; | |
72 | with Sem_Mech; use Sem_Mech; | |
73 | with Sem_Prag; use Sem_Prag; | |
74 | with Sem_Res; use Sem_Res; | |
75 | with Sem_Util; use Sem_Util; | |
76 | with Sem_Type; use Sem_Type; | |
77 | with Sem_Warn; use Sem_Warn; | |
78 | with Sinput; use Sinput; | |
79 | with Stand; use Stand; | |
80 | with Sinfo; use Sinfo; | |
81 | with Sinfo.CN; use Sinfo.CN; | |
82 | with Snames; use Snames; | |
83 | with Stringt; use Stringt; | |
84 | with Style; | |
85 | with Stylesw; use Stylesw; | |
8417f4b2 | 86 | with Targparm; use Targparm; |
996ae0b0 RK |
87 | with Tbuild; use Tbuild; |
88 | with Uintp; use Uintp; | |
89 | with Urealp; use Urealp; | |
90 | with Validsw; use Validsw; | |
91 | ||
92 | package body Sem_Ch6 is | |
93 | ||
c8ef728f | 94 | May_Hide_Profile : Boolean := False; |
ec4867fa ES |
95 | -- This flag is used to indicate that two formals in two subprograms being |
96 | -- checked for conformance differ only in that one is an access parameter | |
97 | -- while the other is of a general access type with the same designated | |
98 | -- type. In this case, if the rest of the signatures match, a call to | |
99 | -- either subprogram may be ambiguous, which is worth a warning. The flag | |
100 | -- is set in Compatible_Types, and the warning emitted in | |
101 | -- New_Overloaded_Entity. | |
c8ef728f | 102 | |
996ae0b0 RK |
103 | ----------------------- |
104 | -- Local Subprograms -- | |
105 | ----------------------- | |
106 | ||
c9d70ab1 AC |
107 | procedure Analyze_Function_Return (N : Node_Id); |
108 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement | |
109 | -- applies to a [generic] function. | |
110 | ||
111 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); | |
112 | -- Analyze a generic subprogram body. N is the body to be analyzed, and | |
113 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
114 | ||
4d8f3296 ES |
115 | procedure Analyze_Null_Procedure |
116 | (N : Node_Id; | |
117 | Is_Completion : out Boolean); | |
9d2a2071 | 118 | -- A null procedure can be a declaration or (Ada 2012) a completion |
4d8f3296 | 119 | |
5d37ba92 | 120 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 121 | -- Common processing for simple and extended return statements |
ec4867fa | 122 | |
82c80734 RD |
123 | procedure Analyze_Return_Type (N : Node_Id); |
124 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 125 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
126 | -- outer homographs. |
127 | ||
b1b543d2 | 128 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
129 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
130 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 131 | |
806f6d37 AC |
132 | function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
133 | -- Returns true if Subp can override a predefined operator. | |
134 | ||
996ae0b0 | 135 | procedure Check_Conformance |
41251c60 JM |
136 | (New_Id : Entity_Id; |
137 | Old_Id : Entity_Id; | |
138 | Ctype : Conformance_Type; | |
139 | Errmsg : Boolean; | |
140 | Conforms : out Boolean; | |
141 | Err_Loc : Node_Id := Empty; | |
142 | Get_Inst : Boolean := False; | |
143 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
144 | -- Given two entities, this procedure checks that the profiles associated |
145 | -- with these entities meet the conformance criterion given by the third | |
146 | -- parameter. If they conform, Conforms is set True and control returns | |
147 | -- to the caller. If they do not conform, Conforms is set to False, and | |
148 | -- in addition, if Errmsg is True on the call, proper messages are output | |
149 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
150 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
151 | -- error messages are placed on the appropriate part of the construct | |
152 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
153 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
154 | -- be called. | |
155 | ||
156 | procedure Check_Subprogram_Order (N : Node_Id); | |
157 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
158 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
159 | ||
996ae0b0 RK |
160 | procedure Check_Returns |
161 | (HSS : Node_Id; | |
162 | Mode : Character; | |
c8ef728f ES |
163 | Err : out Boolean; |
164 | Proc : Entity_Id := Empty); | |
165 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 166 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
167 | -- handled statement sequence for the subprogram body. This procedure |
168 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
169 | -- used for functions) or do not have a return (Mode = 'P', used for | |
170 | -- No_Return procedures). The flag Err is set if there are any control | |
171 | -- paths not explicitly terminated by a return in the function case, and is | |
172 | -- True otherwise. Proc is the entity for the procedure case and is used | |
173 | -- in posting the warning message. | |
996ae0b0 | 174 | |
e5a58fac AC |
175 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
176 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
177 | -- must appear before the type is frozen, and have the same visibility as | |
178 | -- that of the type. This procedure checks that this rule is met, and | |
179 | -- otherwise emits an error on the subprogram declaration and a warning | |
b2834fbd AC |
180 | -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode, |
181 | -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier | |
182 | -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility | |
183 | -- is set, otherwise the call has no effect. | |
e5a58fac | 184 | |
996ae0b0 | 185 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
186 | -- This procedure makes S, a new overloaded entity, into the first visible |
187 | -- entity with that name. | |
996ae0b0 | 188 | |
a5b62485 AC |
189 | function Is_Non_Overriding_Operation |
190 | (Prev_E : Entity_Id; | |
191 | New_E : Entity_Id) return Boolean; | |
192 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
193 | -- overrides an inherited operation only if the corresponding operation | |
260359e3 AC |
194 | -- was overriding in the generic. This needs to be checked for primitive |
195 | -- operations of types derived (in the generic unit) from formal private | |
196 | -- or formal derived types. | |
a5b62485 | 197 | |
996ae0b0 RK |
198 | procedure Make_Inequality_Operator (S : Entity_Id); |
199 | -- Create the declaration for an inequality operator that is implicitly | |
200 | -- created by a user-defined equality operator that yields a boolean. | |
201 | ||
996ae0b0 RK |
202 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
203 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
204 | -- setting the proper validity status for this entity, which depends on |
205 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
206 | |
207 | --------------------------------------------- | |
208 | -- Analyze_Abstract_Subprogram_Declaration -- | |
209 | --------------------------------------------- | |
210 | ||
211 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
241ebe89 | 212 | GM : constant Ghost_Mode_Type := Ghost_Mode; |
ad4ba28b AC |
213 | Scop : constant Entity_Id := Current_Scope; |
214 | Subp_Id : constant Entity_Id := | |
241ebe89 | 215 | Analyze_Subprogram_Specification (Specification (N)); |
996ae0b0 RK |
216 | |
217 | begin | |
8636f52f HK |
218 | -- The abstract subprogram declaration may be subject to pragma Ghost |
219 | -- with policy Ignore. Set the mode now to ensure that any nodes | |
220 | -- generated during analysis and expansion are properly flagged as | |
221 | -- ignored Ghost. | |
222 | ||
223 | Set_Ghost_Mode (N); | |
ce5ba43a | 224 | Check_SPARK_05_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 225 | |
241ebe89 | 226 | Generate_Definition (Subp_Id); |
c9d70ab1 | 227 | |
241ebe89 HK |
228 | Set_Is_Abstract_Subprogram (Subp_Id); |
229 | New_Overloaded_Entity (Subp_Id); | |
230 | Check_Delayed_Subprogram (Subp_Id); | |
996ae0b0 | 231 | |
241ebe89 | 232 | Set_Categorization_From_Scope (Subp_Id, Scop); |
996ae0b0 | 233 | |
8636f52f | 234 | -- An abstract subprogram declared within a Ghost region is rendered |
c5cec2fe AC |
235 | -- Ghost (SPARK RM 6.9(2)). |
236 | ||
241ebe89 HK |
237 | if Ghost_Mode > None then |
238 | Set_Is_Ghost_Entity (Subp_Id); | |
c5cec2fe AC |
239 | end if; |
240 | ||
241ebe89 HK |
241 | if Ekind (Scope (Subp_Id)) = E_Protected_Type then |
242 | Error_Msg_N ("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 | |
241ebe89 HK |
249 | and then not Is_Dispatching_Operation (Subp_Id) |
250 | and then not Present (Overridden_Operation (Subp_Id)) | |
251 | and then (not Is_Operator_Symbol_Name (Chars (Subp_Id)) | |
252 | or else Scop /= Scope (Etype (First_Formal (Subp_Id)))) | |
5d37ba92 ES |
253 | then |
254 | Error_Msg_N | |
dbfeb4fa | 255 | ("abstract subprogram is not dispatching or overriding?r?", N); |
996ae0b0 | 256 | end if; |
fbf5a39b | 257 | |
241ebe89 HK |
258 | Generate_Reference_To_Formals (Subp_Id); |
259 | Check_Eliminated (Subp_Id); | |
eaba57fb RD |
260 | |
261 | if Has_Aspects (N) then | |
241ebe89 | 262 | Analyze_Aspect_Specifications (N, Subp_Id); |
eaba57fb | 263 | end if; |
241ebe89 HK |
264 | |
265 | -- Restore the original Ghost mode once analysis and expansion have | |
266 | -- taken place. | |
267 | ||
268 | Ghost_Mode := GM; | |
996ae0b0 RK |
269 | end Analyze_Abstract_Subprogram_Declaration; |
270 | ||
b0186f71 AC |
271 | --------------------------------- |
272 | -- Analyze_Expression_Function -- | |
273 | --------------------------------- | |
274 | ||
275 | procedure Analyze_Expression_Function (N : Node_Id) is | |
8d1fe980 AC |
276 | Expr : constant Node_Id := Expression (N); |
277 | Loc : constant Source_Ptr := Sloc (N); | |
278 | LocX : constant Source_Ptr := Sloc (Expr); | |
279 | Spec : constant Node_Id := Specification (N); | |
d2d4b355 | 280 | |
8a06151a | 281 | Def_Id : Entity_Id; |
b0186f71 | 282 | |
8a06151a | 283 | Prev : Entity_Id; |
b0186f71 | 284 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
285 | -- declaration is completed. Def_Id is needed to analyze the spec. |
286 | ||
287 | New_Body : Node_Id; | |
d2d4b355 | 288 | New_Spec : Node_Id; |
b913199e | 289 | Ret : Node_Id; |
b0186f71 AC |
290 | |
291 | begin | |
292 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 293 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
294 | -- function into an equivalent subprogram body, and analyze it. |
295 | ||
296 | -- Expression functions are inlined unconditionally. The back-end will | |
297 | -- determine whether this is possible. | |
298 | ||
299 | Inline_Processing_Required := True; | |
b727a82b | 300 | |
8d1fe980 AC |
301 | -- Create a specification for the generated body. This must be done |
302 | -- prior to the analysis of the initial declaration. | |
b727a82b | 303 | |
8d1fe980 AC |
304 | New_Spec := Copy_Subprogram_Spec (Spec); |
305 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
d2d4b355 AC |
306 | |
307 | -- If there are previous overloadable entities with the same name, | |
308 | -- check whether any of them is completed by the expression function. | |
b04d926e | 309 | -- In a generic context a formal subprogram has no completion. |
d2d4b355 | 310 | |
4b6f99f5 RD |
311 | if Present (Prev) |
312 | and then Is_Overloadable (Prev) | |
b04d926e AC |
313 | and then not Is_Formal_Subprogram (Prev) |
314 | then | |
51597c23 AC |
315 | Def_Id := Analyze_Subprogram_Specification (Spec); |
316 | Prev := Find_Corresponding_Spec (N); | |
35e7063a AC |
317 | |
318 | -- The previous entity may be an expression function as well, in | |
319 | -- which case the redeclaration is illegal. | |
320 | ||
321 | if Present (Prev) | |
5073ad7a AC |
322 | and then Nkind (Original_Node (Unit_Declaration_Node (Prev))) = |
323 | N_Expression_Function | |
35e7063a | 324 | then |
bc5e261c ES |
325 | Error_Msg_Sloc := Sloc (Prev); |
326 | Error_Msg_N ("& conflicts with declaration#", Def_Id); | |
35e7063a AC |
327 | return; |
328 | end if; | |
d2d4b355 | 329 | end if; |
b0186f71 | 330 | |
b913199e AC |
331 | Ret := Make_Simple_Return_Statement (LocX, Expression (N)); |
332 | ||
b0186f71 AC |
333 | New_Body := |
334 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 335 | Specification => New_Spec, |
b0186f71 AC |
336 | Declarations => Empty_List, |
337 | Handled_Statement_Sequence => | |
338 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 339 | Statements => New_List (Ret))); |
b0186f71 | 340 | |
e7f23f06 AC |
341 | -- If the expression completes a generic subprogram, we must create a |
342 | -- separate node for the body, because at instantiation the original | |
343 | -- node of the generic copy must be a generic subprogram body, and | |
344 | -- cannot be a expression function. Otherwise we just rewrite the | |
345 | -- expression with the non-generic body. | |
346 | ||
6d7e5c54 | 347 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
e7f23f06 | 348 | Insert_After (N, New_Body); |
6d7e5c54 | 349 | |
e7f23f06 AC |
350 | -- Propagate any aspects or pragmas that apply to the expression |
351 | -- function to the proper body when the expression function acts | |
352 | -- as a completion. | |
353 | ||
354 | if Has_Aspects (N) then | |
355 | Move_Aspects (N, To => New_Body); | |
356 | end if; | |
357 | ||
358 | Relocate_Pragmas_To_Body (New_Body); | |
b0186f71 | 359 | |
b0186f71 | 360 | Rewrite (N, Make_Null_Statement (Loc)); |
d2d4b355 | 361 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
362 | Analyze (N); |
363 | Analyze (New_Body); | |
d2b10647 | 364 | Set_Is_Inlined (Prev); |
b0186f71 | 365 | |
e5c4e2bc AC |
366 | -- If the expression function is a completion, the previous declaration |
367 | -- must come from source. We know already that appears in the current | |
368 | -- scope. The entity itself may be internally created if within a body | |
369 | -- to be inlined. | |
370 | ||
4b6f99f5 RD |
371 | elsif Present (Prev) |
372 | and then Comes_From_Source (Parent (Prev)) | |
b04d926e AC |
373 | and then not Is_Formal_Subprogram (Prev) |
374 | then | |
d2d4b355 | 375 | Set_Has_Completion (Prev, False); |
76264f60 | 376 | |
c6d2191a AC |
377 | -- An expression function that is a completion freezes the |
378 | -- expression. This means freezing the return type, and if it is | |
379 | -- an access type, freezing its designated type as well. | |
1b31321b | 380 | |
c6d2191a | 381 | -- Note that we cannot defer this freezing to the analysis of the |
1b31321b AC |
382 | -- expression itself, because a freeze node might appear in a nested |
383 | -- scope, leading to an elaboration order issue in gigi. | |
c6d2191a AC |
384 | |
385 | Freeze_Before (N, Etype (Prev)); | |
1b31321b | 386 | |
c6d2191a AC |
387 | if Is_Access_Type (Etype (Prev)) then |
388 | Freeze_Before (N, Designated_Type (Etype (Prev))); | |
389 | end if; | |
390 | ||
76264f60 AC |
391 | -- For navigation purposes, indicate that the function is a body |
392 | ||
393 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 394 | Rewrite (N, New_Body); |
e7f23f06 | 395 | |
c0cdbd39 AC |
396 | -- Correct the parent pointer of the aspect specification list to |
397 | -- reference the rewritten node. | |
398 | ||
399 | if Has_Aspects (N) then | |
400 | Set_Parent (Aspect_Specifications (N), N); | |
401 | end if; | |
402 | ||
e7f23f06 AC |
403 | -- Propagate any pragmas that apply to the expression function to the |
404 | -- proper body when the expression function acts as a completion. | |
405 | -- Aspects are automatically transfered because of node rewriting. | |
406 | ||
407 | Relocate_Pragmas_To_Body (N); | |
d2b10647 ES |
408 | Analyze (N); |
409 | ||
6d7e5c54 AC |
410 | -- Prev is the previous entity with the same name, but it is can |
411 | -- be an unrelated spec that is not completed by the expression | |
412 | -- function. In that case the relevant entity is the one in the body. | |
413 | -- Not clear that the backend can inline it in this case ??? | |
414 | ||
415 | if Has_Completion (Prev) then | |
416 | Set_Is_Inlined (Prev); | |
31af8899 AC |
417 | |
418 | -- The formals of the expression function are body formals, | |
419 | -- and do not appear in the ali file, which will only contain | |
420 | -- references to the formals of the original subprogram spec. | |
421 | ||
422 | declare | |
423 | F1 : Entity_Id; | |
424 | F2 : Entity_Id; | |
425 | ||
426 | begin | |
427 | F1 := First_Formal (Def_Id); | |
428 | F2 := First_Formal (Prev); | |
429 | ||
430 | while Present (F1) loop | |
431 | Set_Spec_Entity (F1, F2); | |
432 | Next_Formal (F1); | |
433 | Next_Formal (F2); | |
434 | end loop; | |
435 | end; | |
436 | ||
6d7e5c54 AC |
437 | else |
438 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
439 | end if; | |
440 | ||
0b5b2bbc | 441 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 442 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
443 | |
444 | else | |
a52e6d7e AC |
445 | -- An expression function that is not a completion is not a |
446 | -- subprogram declaration, and thus cannot appear in a protected | |
447 | -- definition. | |
448 | ||
449 | if Nkind (Parent (N)) = N_Protected_Definition then | |
450 | Error_Msg_N | |
451 | ("an expression function is not a legal protected operation", N); | |
452 | end if; | |
453 | ||
b8e6830b | 454 | Rewrite (N, Make_Subprogram_Declaration (Loc, Specification => Spec)); |
c0cdbd39 AC |
455 | |
456 | -- Correct the parent pointer of the aspect specification list to | |
457 | -- reference the rewritten node. | |
458 | ||
459 | if Has_Aspects (N) then | |
460 | Set_Parent (Aspect_Specifications (N), N); | |
461 | end if; | |
462 | ||
b0186f71 | 463 | Analyze (N); |
b04d926e | 464 | |
e699b76e AC |
465 | -- Within a generic pre-analyze the original expression for name |
466 | -- capture. The body is also generated but plays no role in | |
467 | -- this because it is not part of the original source. | |
b04d926e AC |
468 | |
469 | if Inside_A_Generic then | |
470 | declare | |
471 | Id : constant Entity_Id := Defining_Entity (N); | |
b04d926e AC |
472 | |
473 | begin | |
474 | Set_Has_Completion (Id); | |
b04d926e AC |
475 | Push_Scope (Id); |
476 | Install_Formals (Id); | |
e699b76e | 477 | Preanalyze_Spec_Expression (Expr, Etype (Id)); |
b04d926e | 478 | End_Scope; |
b04d926e AC |
479 | end; |
480 | end if; | |
481 | ||
b8e6830b AC |
482 | Set_Is_Inlined (Defining_Entity (N)); |
483 | ||
484 | -- Establish the linkages between the spec and the body. These are | |
485 | -- used when the expression function acts as the prefix of attribute | |
486 | -- 'Access in order to freeze the original expression which has been | |
487 | -- moved to the generated body. | |
488 | ||
489 | Set_Corresponding_Body (N, Defining_Entity (New_Body)); | |
490 | Set_Corresponding_Spec (New_Body, Defining_Entity (N)); | |
d2b10647 | 491 | |
6d7e5c54 AC |
492 | -- To prevent premature freeze action, insert the new body at the end |
493 | -- of the current declarations, or at the end of the package spec. | |
b913199e | 494 | -- However, resolve usage names now, to prevent spurious visibility |
ad4e3362 ES |
495 | -- on later entities. Note that the function can now be called in |
496 | -- the current declarative part, which will appear to be prior to | |
497 | -- the presence of the body in the code. There are nevertheless no | |
498 | -- order of elaboration issues because all name resolution has taken | |
499 | -- place at the point of declaration. | |
6d7e5c54 AC |
500 | |
501 | declare | |
e876c43a AC |
502 | Decls : List_Id := List_Containing (N); |
503 | Par : constant Node_Id := Parent (Decls); | |
b8e6830b | 504 | Id : constant Entity_Id := Defining_Entity (N); |
6d7e5c54 AC |
505 | |
506 | begin | |
fce54763 AC |
507 | -- If this is a wrapper created for in an instance for a formal |
508 | -- subprogram, insert body after declaration, to be analyzed when | |
509 | -- the enclosing instance is analyzed. | |
510 | ||
511 | if GNATprove_Mode | |
512 | and then Is_Generic_Actual_Subprogram (Defining_Entity (N)) | |
6d7e5c54 | 513 | then |
fce54763 AC |
514 | Insert_After (N, New_Body); |
515 | ||
516 | else | |
517 | if Nkind (Par) = N_Package_Specification | |
518 | and then Decls = Visible_Declarations (Par) | |
519 | and then Present (Private_Declarations (Par)) | |
520 | and then not Is_Empty_List (Private_Declarations (Par)) | |
521 | then | |
522 | Decls := Private_Declarations (Par); | |
523 | end if; | |
6d7e5c54 | 524 | |
fce54763 AC |
525 | Insert_After (Last (Decls), New_Body); |
526 | Push_Scope (Id); | |
527 | Install_Formals (Id); | |
3a8e3f63 | 528 | |
fce54763 AC |
529 | -- Preanalyze the expression for name capture, except in an |
530 | -- instance, where this has been done during generic analysis, | |
531 | -- and will be redone when analyzing the body. | |
845f06e2 | 532 | |
fce54763 AC |
533 | declare |
534 | Expr : constant Node_Id := Expression (Ret); | |
4058ddcc | 535 | |
fce54763 AC |
536 | begin |
537 | Set_Parent (Expr, Ret); | |
4058ddcc | 538 | |
fce54763 AC |
539 | if not In_Instance then |
540 | Preanalyze_Spec_Expression (Expr, Etype (Id)); | |
541 | end if; | |
542 | end; | |
3a8e3f63 | 543 | |
fce54763 AC |
544 | End_Scope; |
545 | end if; | |
6d7e5c54 | 546 | end; |
b0186f71 | 547 | end if; |
0b5b2bbc AC |
548 | |
549 | -- If the return expression is a static constant, we suppress warning | |
550 | -- messages on unused formals, which in most cases will be noise. | |
551 | ||
552 | Set_Is_Trivial_Subprogram (Defining_Entity (New_Body), | |
553 | Is_OK_Static_Expression (Expr)); | |
b0186f71 AC |
554 | end Analyze_Expression_Function; |
555 | ||
ec4867fa ES |
556 | ---------------------------------------- |
557 | -- Analyze_Extended_Return_Statement -- | |
558 | ---------------------------------------- | |
559 | ||
560 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
561 | begin | |
c86cf714 | 562 | Check_Compiler_Unit ("extended return statement", N); |
5d37ba92 | 563 | Analyze_Return_Statement (N); |
ec4867fa ES |
564 | end Analyze_Extended_Return_Statement; |
565 | ||
996ae0b0 RK |
566 | ---------------------------- |
567 | -- Analyze_Function_Call -- | |
568 | ---------------------------- | |
569 | ||
570 | procedure Analyze_Function_Call (N : Node_Id) is | |
a7e68e7f HK |
571 | Actuals : constant List_Id := Parameter_Associations (N); |
572 | Func_Nam : constant Node_Id := Name (N); | |
573 | Actual : Node_Id; | |
574 | ||
996ae0b0 | 575 | begin |
a7e68e7f | 576 | Analyze (Func_Nam); |
996ae0b0 | 577 | |
3e7302c3 AC |
578 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
579 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
580 | -- has been analyzed and we just return. | |
82c80734 | 581 | |
a7e68e7f HK |
582 | if Nkind (Func_Nam) = N_Selected_Component |
583 | and then Name (N) /= Func_Nam | |
82c80734 RD |
584 | and then Is_Rewrite_Substitution (N) |
585 | and then Present (Etype (N)) | |
586 | then | |
587 | return; | |
588 | end if; | |
589 | ||
996ae0b0 RK |
590 | -- If error analyzing name, then set Any_Type as result type and return |
591 | ||
a7e68e7f | 592 | if Etype (Func_Nam) = Any_Type then |
996ae0b0 RK |
593 | Set_Etype (N, Any_Type); |
594 | return; | |
595 | end if; | |
596 | ||
597 | -- Otherwise analyze the parameters | |
598 | ||
e24329cd YM |
599 | if Present (Actuals) then |
600 | Actual := First (Actuals); | |
996ae0b0 RK |
601 | while Present (Actual) loop |
602 | Analyze (Actual); | |
603 | Check_Parameterless_Call (Actual); | |
604 | Next (Actual); | |
605 | end loop; | |
606 | end if; | |
607 | ||
608 | Analyze_Call (N); | |
996ae0b0 RK |
609 | end Analyze_Function_Call; |
610 | ||
ec4867fa ES |
611 | ----------------------------- |
612 | -- Analyze_Function_Return -- | |
613 | ----------------------------- | |
614 | ||
615 | procedure Analyze_Function_Return (N : Node_Id) is | |
a7e68e7f HK |
616 | Loc : constant Source_Ptr := Sloc (N); |
617 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
618 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
ec4867fa | 619 | |
5d37ba92 | 620 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
621 | -- Function result subtype |
622 | ||
623 | procedure Check_Limited_Return (Expr : Node_Id); | |
624 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
625 | -- limited types. Used only for simple return statements. | |
626 | -- Expr is the expression returned. | |
627 | ||
628 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
629 | -- Check that the return_subtype_indication properly matches the result | |
630 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
631 | ||
632 | -------------------------- | |
633 | -- Check_Limited_Return -- | |
634 | -------------------------- | |
635 | ||
636 | procedure Check_Limited_Return (Expr : Node_Id) is | |
637 | begin | |
638 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
639 | -- removed and replaced by anonymous access results. This is an | |
640 | -- incompatibility with Ada 95. Not clear whether this should be | |
641 | -- enforced yet or perhaps controllable with special switch. ??? | |
642 | ||
ce72a9a3 AC |
643 | -- A limited interface that is not immutably limited is OK. |
644 | ||
645 | if Is_Limited_Interface (R_Type) | |
646 | and then | |
647 | not (Is_Task_Interface (R_Type) | |
648 | or else Is_Protected_Interface (R_Type) | |
649 | or else Is_Synchronized_Interface (R_Type)) | |
650 | then | |
651 | null; | |
652 | ||
653 | elsif Is_Limited_Type (R_Type) | |
654 | and then not Is_Interface (R_Type) | |
ec4867fa ES |
655 | and then Comes_From_Source (N) |
656 | and then not In_Instance_Body | |
2a31c32b | 657 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
658 | then |
659 | -- Error in Ada 2005 | |
660 | ||
0791fbe9 | 661 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
662 | and then not Debug_Flag_Dot_L |
663 | and then not GNAT_Mode | |
664 | then | |
665 | Error_Msg_N | |
3ccedacc AC |
666 | ("(Ada 2005) cannot copy object of a limited type " |
667 | & "(RM-2005 6.5(5.5/2))", Expr); | |
e0ae93e2 | 668 | |
51245e2d | 669 | if Is_Limited_View (R_Type) then |
ec4867fa ES |
670 | Error_Msg_N |
671 | ("\return by reference not permitted in Ada 2005", Expr); | |
672 | end if; | |
673 | ||
674 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
675 | -- incompatibility. | |
676 | ||
677 | -- In GNAT mode, this is just a warning, to allow it to be | |
678 | -- evilly turned off. Otherwise it is a real error. | |
679 | ||
9694c039 AC |
680 | -- In a generic context, simplify the warning because it makes |
681 | -- no sense to discuss pass-by-reference or copy. | |
682 | ||
ec4867fa | 683 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
684 | if Inside_A_Generic then |
685 | Error_Msg_N | |
885c4871 | 686 | ("return of limited object not permitted in Ada 2005 " |
dbfeb4fa | 687 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
9694c039 | 688 | |
51245e2d | 689 | elsif Is_Limited_View (R_Type) then |
ec4867fa | 690 | Error_Msg_N |
20261dc1 | 691 | ("return by reference not permitted in Ada 2005 " |
dbfeb4fa | 692 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
693 | else |
694 | Error_Msg_N | |
20261dc1 | 695 | ("cannot copy object of a limited type in Ada 2005 " |
dbfeb4fa | 696 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
697 | end if; |
698 | ||
699 | -- Ada 95 mode, compatibility warnings disabled | |
700 | ||
701 | else | |
702 | return; -- skip continuation messages below | |
703 | end if; | |
704 | ||
9694c039 AC |
705 | if not Inside_A_Generic then |
706 | Error_Msg_N | |
707 | ("\consider switching to return of access type", Expr); | |
708 | Explain_Limited_Type (R_Type, Expr); | |
709 | end if; | |
ec4867fa ES |
710 | end if; |
711 | end Check_Limited_Return; | |
712 | ||
713 | ------------------------------------- | |
714 | -- Check_Return_Subtype_Indication -- | |
715 | ------------------------------------- | |
716 | ||
717 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
718 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
719 | ||
720 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
721 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
722 | |
723 | Subtype_Ind : constant Node_Id := | |
724 | Object_Definition (Original_Node (Obj_Decl)); | |
725 | ||
7f568bfa AC |
726 | R_Type_Is_Anon_Access : constant Boolean := |
727 | Ekind_In (R_Type, | |
728 | E_Anonymous_Access_Subprogram_Type, | |
729 | E_Anonymous_Access_Protected_Subprogram_Type, | |
730 | E_Anonymous_Access_Type); | |
ec4867fa ES |
731 | -- True if return type of the function is an anonymous access type |
732 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
733 | ||
7f568bfa AC |
734 | R_Stm_Type_Is_Anon_Access : constant Boolean := |
735 | Ekind_In (R_Stm_Type, | |
736 | E_Anonymous_Access_Subprogram_Type, | |
737 | E_Anonymous_Access_Protected_Subprogram_Type, | |
738 | E_Anonymous_Access_Type); | |
ec4867fa ES |
739 | -- True if type of the return object is an anonymous access type |
740 | ||
7f568bfa AC |
741 | procedure Error_No_Match (N : Node_Id); |
742 | -- Output error messages for case where types do not statically | |
743 | -- match. N is the location for the messages. | |
744 | ||
745 | -------------------- | |
746 | -- Error_No_Match -- | |
747 | -------------------- | |
748 | ||
749 | procedure Error_No_Match (N : Node_Id) is | |
750 | begin | |
751 | Error_Msg_N | |
752 | ("subtype must statically match function result subtype", N); | |
753 | ||
754 | if not Predicates_Match (R_Stm_Type, R_Type) then | |
755 | Error_Msg_Node_2 := R_Type; | |
756 | Error_Msg_NE | |
3ccedacc | 757 | ("\predicate of& does not match predicate of&", |
7f568bfa AC |
758 | N, R_Stm_Type); |
759 | end if; | |
760 | end Error_No_Match; | |
761 | ||
762 | -- Start of processing for Check_Return_Subtype_Indication | |
763 | ||
ec4867fa | 764 | begin |
7665e4bd | 765 | -- First, avoid cascaded errors |
ec4867fa ES |
766 | |
767 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
768 | return; | |
769 | end if; | |
770 | ||
771 | -- "return access T" case; check that the return statement also has | |
772 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 773 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
774 | |
775 | if R_Type_Is_Anon_Access then | |
776 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
777 | if |
778 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 779 | then |
53cf4600 ES |
780 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
781 | Base_Type (Designated_Type (R_Type)) | |
782 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
783 | then | |
7f568bfa | 784 | Error_No_Match (Subtype_Mark (Subtype_Ind)); |
53cf4600 ES |
785 | end if; |
786 | ||
787 | else | |
788 | -- For two anonymous access to subprogram types, the | |
789 | -- types themselves must be type conformant. | |
790 | ||
791 | if not Conforming_Types | |
792 | (R_Stm_Type, R_Type, Fully_Conformant) | |
793 | then | |
7f568bfa | 794 | Error_No_Match (Subtype_Ind); |
53cf4600 | 795 | end if; |
ec4867fa | 796 | end if; |
0a36105d | 797 | |
ec4867fa ES |
798 | else |
799 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
800 | end if; | |
801 | ||
6cce2156 GD |
802 | -- If the return object is of an anonymous access type, then report |
803 | -- an error if the function's result type is not also anonymous. | |
804 | ||
805 | elsif R_Stm_Type_Is_Anon_Access | |
806 | and then not R_Type_Is_Anon_Access | |
807 | then | |
3ccedacc AC |
808 | Error_Msg_N ("anonymous access not allowed for function with " |
809 | & "named access result", Subtype_Ind); | |
6cce2156 | 810 | |
81d93365 AC |
811 | -- Subtype indication case: check that the return object's type is |
812 | -- covered by the result type, and that the subtypes statically match | |
813 | -- when the result subtype is constrained. Also handle record types | |
814 | -- with unknown discriminants for which we have built the underlying | |
815 | -- record view. Coverage is needed to allow specific-type return | |
816 | -- objects when the result type is class-wide (see AI05-32). | |
817 | ||
818 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 819 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
820 | and then |
821 | Covers | |
822 | (Base_Type (R_Type), | |
823 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
824 | then |
825 | -- A null exclusion may be present on the return type, on the | |
826 | -- function specification, on the object declaration or on the | |
827 | -- subtype itself. | |
ec4867fa | 828 | |
21d27997 RD |
829 | if Is_Access_Type (R_Type) |
830 | and then | |
831 | (Can_Never_Be_Null (R_Type) | |
832 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
833 | Can_Never_Be_Null (R_Stm_Type) | |
834 | then | |
7f568bfa | 835 | Error_No_Match (Subtype_Ind); |
21d27997 RD |
836 | end if; |
837 | ||
105b5e65 | 838 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
839 | |
840 | if Is_Constrained (R_Type) | |
841 | or else Is_Access_Type (R_Type) | |
842 | then | |
ec4867fa | 843 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
7f568bfa | 844 | Error_No_Match (Subtype_Ind); |
ec4867fa ES |
845 | end if; |
846 | end if; | |
847 | ||
a8b346d2 RD |
848 | -- All remaining cases are illegal |
849 | ||
850 | -- Note: previous versions of this subprogram allowed the return | |
851 | -- value to be the ancestor of the return type if the return type | |
852 | -- was a null extension. This was plainly incorrect. | |
ff7139c3 | 853 | |
ec4867fa ES |
854 | else |
855 | Error_Msg_N | |
856 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
857 | end if; | |
858 | end Check_Return_Subtype_Indication; | |
859 | ||
860 | --------------------- | |
861 | -- Local Variables -- | |
862 | --------------------- | |
863 | ||
445e5888 AC |
864 | Expr : Node_Id; |
865 | Obj_Decl : Node_Id; | |
ec4867fa ES |
866 | |
867 | -- Start of processing for Analyze_Function_Return | |
868 | ||
869 | begin | |
870 | Set_Return_Present (Scope_Id); | |
871 | ||
5d37ba92 | 872 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 873 | Expr := Expression (N); |
4ee646da | 874 | |
e917aec2 RD |
875 | -- Guard against a malformed expression. The parser may have tried to |
876 | -- recover but the node is not analyzable. | |
4ee646da AC |
877 | |
878 | if Nkind (Expr) = N_Error then | |
879 | Set_Etype (Expr, Any_Type); | |
880 | Expander_Mode_Save_And_Set (False); | |
881 | return; | |
882 | ||
883 | else | |
0180fd26 AC |
884 | -- The resolution of a controlled [extension] aggregate associated |
885 | -- with a return statement creates a temporary which needs to be | |
886 | -- finalized on function exit. Wrap the return statement inside a | |
887 | -- block so that the finalization machinery can detect this case. | |
888 | -- This early expansion is done only when the return statement is | |
889 | -- not part of a handled sequence of statements. | |
890 | ||
891 | if Nkind_In (Expr, N_Aggregate, | |
892 | N_Extension_Aggregate) | |
893 | and then Needs_Finalization (R_Type) | |
894 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
895 | then | |
896 | Rewrite (N, | |
897 | Make_Block_Statement (Loc, | |
898 | Handled_Statement_Sequence => | |
899 | Make_Handled_Sequence_Of_Statements (Loc, | |
900 | Statements => New_List (Relocate_Node (N))))); | |
901 | ||
902 | Analyze (N); | |
903 | return; | |
904 | end if; | |
905 | ||
4b963531 AC |
906 | Analyze (Expr); |
907 | ||
908 | -- Ada 2005 (AI-251): If the type of the returned object is | |
909 | -- an access to an interface type then we add an implicit type | |
910 | -- conversion to force the displacement of the "this" pointer to | |
911 | -- reference the secondary dispatch table. We cannot delay the | |
912 | -- generation of this implicit conversion until the expansion | |
913 | -- because in this case the type resolution changes the decoration | |
914 | -- of the expression node to match R_Type; by contrast, if the | |
915 | -- returned object is a class-wide interface type then it is too | |
916 | -- early to generate here the implicit conversion since the return | |
917 | -- statement may be rewritten by the expander into an extended | |
918 | -- return statement whose expansion takes care of adding the | |
919 | -- implicit type conversion to displace the pointer to the object. | |
920 | ||
921 | if Expander_Active | |
922 | and then Serious_Errors_Detected = 0 | |
923 | and then Is_Access_Type (R_Type) | |
924 | and then Nkind (Expr) /= N_Null | |
925 | and then Is_Interface (Designated_Type (R_Type)) | |
926 | and then Is_Progenitor (Designated_Type (R_Type), | |
927 | Designated_Type (Etype (Expr))) | |
928 | then | |
73e5aa55 | 929 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); |
4b963531 AC |
930 | Analyze (Expr); |
931 | end if; | |
932 | ||
933 | Resolve (Expr, R_Type); | |
4ee646da AC |
934 | Check_Limited_Return (Expr); |
935 | end if; | |
ec4867fa | 936 | |
ad05f2e9 | 937 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 938 | |
fe5d3068 | 939 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
940 | and then |
941 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 942 | or else Present (Next (N))) |
607d0635 | 943 | then |
ce5ba43a | 944 | Check_SPARK_05_Restriction |
fe5d3068 | 945 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
946 | end if; |
947 | ||
ec4867fa | 948 | else |
ce5ba43a | 949 | Check_SPARK_05_Restriction ("extended RETURN is not allowed", N); |
445e5888 | 950 | Obj_Decl := Last (Return_Object_Declarations (N)); |
607d0635 | 951 | |
ec4867fa ES |
952 | -- Analyze parts specific to extended_return_statement: |
953 | ||
954 | declare | |
de6cad7c | 955 | Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
b9daa96e | 956 | HSS : constant Node_Id := Handled_Statement_Sequence (N); |
ec4867fa ES |
957 | |
958 | begin | |
959 | Expr := Expression (Obj_Decl); | |
960 | ||
961 | -- Note: The check for OK_For_Limited_Init will happen in | |
962 | -- Analyze_Object_Declaration; we treat it as a normal | |
963 | -- object declaration. | |
964 | ||
cd1c668b | 965 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
966 | Analyze (Obj_Decl); |
967 | ||
ec4867fa ES |
968 | Check_Return_Subtype_Indication (Obj_Decl); |
969 | ||
970 | if Present (HSS) then | |
971 | Analyze (HSS); | |
972 | ||
973 | if Present (Exception_Handlers (HSS)) then | |
974 | ||
975 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
976 | -- Probably by creating an actual N_Block_Statement. | |
977 | -- Probably in Expand. | |
978 | ||
979 | null; | |
980 | end if; | |
981 | end if; | |
982 | ||
9337aa0a AC |
983 | -- Mark the return object as referenced, since the return is an |
984 | -- implicit reference of the object. | |
985 | ||
986 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
987 | ||
ec4867fa | 988 | Check_References (Stm_Entity); |
de6cad7c AC |
989 | |
990 | -- Check RM 6.5 (5.9/3) | |
991 | ||
992 | if Has_Aliased then | |
993 | if Ada_Version < Ada_2012 then | |
dbfeb4fa RD |
994 | |
995 | -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? | |
996 | -- Can it really happen (extended return???) | |
997 | ||
998 | Error_Msg_N | |
b785e0b8 AC |
999 | ("aliased only allowed for limited return objects " |
1000 | & "in Ada 2012??", N); | |
de6cad7c | 1001 | |
51245e2d | 1002 | elsif not Is_Limited_View (R_Type) then |
3ccedacc AC |
1003 | Error_Msg_N |
1004 | ("aliased only allowed for limited return objects", N); | |
de6cad7c AC |
1005 | end if; |
1006 | end if; | |
ec4867fa ES |
1007 | end; |
1008 | end if; | |
1009 | ||
21d27997 | 1010 | -- Case of Expr present |
5d37ba92 | 1011 | |
ec4867fa | 1012 | if Present (Expr) |
21d27997 | 1013 | |
8fde064e | 1014 | -- Defend against previous errors |
21d27997 RD |
1015 | |
1016 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 1017 | and then Present (Etype (Expr)) |
ec4867fa | 1018 | then |
5d37ba92 ES |
1019 | -- Apply constraint check. Note that this is done before the implicit |
1020 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 1021 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
1022 | -- with null-excluding expressions found in return statements. |
1023 | ||
1024 | Apply_Constraint_Check (Expr, R_Type); | |
1025 | ||
1026 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
1027 | -- type, apply an implicit conversion of the expression to that type | |
1028 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 1029 | |
0791fbe9 | 1030 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
1031 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
1032 | then | |
1033 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
1034 | Analyze_And_Resolve (Expr, R_Type); | |
b6b5cca8 AC |
1035 | |
1036 | -- If this is a local anonymous access to subprogram, the | |
1037 | -- accessibility check can be applied statically. The return is | |
1038 | -- illegal if the access type of the return expression is declared | |
1039 | -- inside of the subprogram (except if it is the subtype indication | |
1040 | -- of an extended return statement). | |
1041 | ||
1042 | elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then | |
1043 | if not Comes_From_Source (Current_Scope) | |
1044 | or else Ekind (Current_Scope) = E_Return_Statement | |
1045 | then | |
1046 | null; | |
1047 | ||
1048 | elsif | |
1049 | Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) | |
1050 | then | |
1051 | Error_Msg_N ("cannot return local access to subprogram", N); | |
1052 | end if; | |
1ebc2612 AC |
1053 | |
1054 | -- The expression cannot be of a formal incomplete type | |
1055 | ||
1056 | elsif Ekind (Etype (Expr)) = E_Incomplete_Type | |
1057 | and then Is_Generic_Type (Etype (Expr)) | |
1058 | then | |
1059 | Error_Msg_N | |
1060 | ("cannot return expression of a formal incomplete type", N); | |
ec4867fa ES |
1061 | end if; |
1062 | ||
21d27997 RD |
1063 | -- If the result type is class-wide, then check that the return |
1064 | -- expression's type is not declared at a deeper level than the | |
1065 | -- function (RM05-6.5(5.6/2)). | |
1066 | ||
0791fbe9 | 1067 | if Ada_Version >= Ada_2005 |
21d27997 RD |
1068 | and then Is_Class_Wide_Type (R_Type) |
1069 | then | |
1070 | if Type_Access_Level (Etype (Expr)) > | |
1071 | Subprogram_Access_Level (Scope_Id) | |
1072 | then | |
1073 | Error_Msg_N | |
3ccedacc AC |
1074 | ("level of return expression type is deeper than " |
1075 | & "class-wide function!", Expr); | |
21d27997 RD |
1076 | end if; |
1077 | end if; | |
1078 | ||
4755cce9 JM |
1079 | -- Check incorrect use of dynamically tagged expression |
1080 | ||
1081 | if Is_Tagged_Type (R_Type) then | |
1082 | Check_Dynamically_Tagged_Expression | |
1083 | (Expr => Expr, | |
1084 | Typ => R_Type, | |
1085 | Related_Nod => N); | |
ec4867fa ES |
1086 | end if; |
1087 | ||
ec4867fa ES |
1088 | -- ??? A real run-time accessibility check is needed in cases |
1089 | -- involving dereferences of access parameters. For now we just | |
1090 | -- check the static cases. | |
1091 | ||
0791fbe9 | 1092 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
51245e2d | 1093 | and then Is_Limited_View (Etype (Scope_Id)) |
ec4867fa ES |
1094 | and then Object_Access_Level (Expr) > |
1095 | Subprogram_Access_Level (Scope_Id) | |
1096 | then | |
9694c039 AC |
1097 | -- Suppress the message in a generic, where the rewriting |
1098 | -- is irrelevant. | |
1099 | ||
1100 | if Inside_A_Generic then | |
1101 | null; | |
1102 | ||
1103 | else | |
1104 | Rewrite (N, | |
1105 | Make_Raise_Program_Error (Loc, | |
1106 | Reason => PE_Accessibility_Check_Failed)); | |
1107 | Analyze (N); | |
1108 | ||
43417b90 | 1109 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
1110 | Error_Msg_N ("cannot return a local value by reference<<", N); |
1111 | Error_Msg_NE ("\& [<<", N, Standard_Program_Error); | |
9694c039 | 1112 | end if; |
ec4867fa | 1113 | end if; |
5d37ba92 ES |
1114 | |
1115 | if Known_Null (Expr) | |
1116 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
1117 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
1118 | then | |
1119 | Apply_Compile_Time_Constraint_Error | |
1120 | (N => Expr, | |
1121 | Msg => "(Ada 2005) null not allowed for " | |
dbfeb4fa | 1122 | & "null-excluding return??", |
5d37ba92 ES |
1123 | Reason => CE_Null_Not_Allowed); |
1124 | end if; | |
445e5888 AC |
1125 | |
1126 | -- RM 6.5 (5.4/3): accessibility checks also apply if the return object | |
1127 | -- has no initializing expression. | |
1128 | ||
1129 | elsif Ada_Version > Ada_2005 and then Is_Class_Wide_Type (R_Type) then | |
1130 | if Type_Access_Level (Etype (Defining_Identifier (Obj_Decl))) > | |
1131 | Subprogram_Access_Level (Scope_Id) | |
1132 | then | |
1133 | Error_Msg_N | |
1134 | ("level of return expression type is deeper than " | |
1135 | & "class-wide function!", Obj_Decl); | |
1136 | end if; | |
ec4867fa ES |
1137 | end if; |
1138 | end Analyze_Function_Return; | |
1139 | ||
996ae0b0 RK |
1140 | ------------------------------------- |
1141 | -- Analyze_Generic_Subprogram_Body -- | |
1142 | ------------------------------------- | |
1143 | ||
1144 | procedure Analyze_Generic_Subprogram_Body | |
1145 | (N : Node_Id; | |
1146 | Gen_Id : Entity_Id) | |
1147 | is | |
fbf5a39b | 1148 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 1149 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 1150 | Body_Id : Entity_Id; |
996ae0b0 | 1151 | New_N : Node_Id; |
fbf5a39b | 1152 | Spec : Node_Id; |
996ae0b0 RK |
1153 | |
1154 | begin | |
82c80734 RD |
1155 | -- Copy body and disable expansion while analyzing the generic For a |
1156 | -- stub, do not copy the stub (which would load the proper body), this | |
1157 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
1158 | |
1159 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
1160 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
1161 | Rewrite (N, New_N); | |
caf07df9 AC |
1162 | |
1163 | -- Once the contents of the generic copy and the template are | |
1164 | -- swapped, do the same for their respective aspect specifications. | |
1165 | ||
1166 | Exchange_Aspects (N, New_N); | |
1167 | ||
1168 | -- Collect all contract-related source pragmas found within the | |
1169 | -- template and attach them to the contract of the subprogram body. | |
1170 | -- This contract is used in the capture of global references within | |
1171 | -- annotations. | |
1172 | ||
1173 | Create_Generic_Contract (N); | |
1174 | ||
996ae0b0 RK |
1175 | Start_Generic; |
1176 | end if; | |
1177 | ||
1178 | Spec := Specification (N); | |
1179 | ||
1180 | -- Within the body of the generic, the subprogram is callable, and | |
1181 | -- behaves like the corresponding non-generic unit. | |
1182 | ||
fbf5a39b | 1183 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
1184 | |
1185 | if Kind = E_Generic_Procedure | |
1186 | and then Nkind (Spec) /= N_Procedure_Specification | |
1187 | then | |
fbf5a39b | 1188 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
1189 | return; |
1190 | ||
1191 | elsif Kind = E_Generic_Function | |
1192 | and then Nkind (Spec) /= N_Function_Specification | |
1193 | then | |
fbf5a39b | 1194 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
1195 | return; |
1196 | end if; | |
1197 | ||
fbf5a39b | 1198 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
1199 | |
1200 | if Has_Completion (Gen_Id) | |
1201 | and then Nkind (Parent (N)) /= N_Subunit | |
1202 | then | |
1203 | Error_Msg_N ("duplicate generic body", N); | |
1204 | return; | |
1205 | else | |
1206 | Set_Has_Completion (Gen_Id); | |
1207 | end if; | |
1208 | ||
1209 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1210 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1211 | else | |
1212 | Set_Corresponding_Spec (N, Gen_Id); | |
1213 | end if; | |
1214 | ||
1215 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1216 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1217 | end if; | |
1218 | ||
1219 | -- Make generic parameters immediately visible in the body. They are | |
1220 | -- needed to process the formals declarations. Then make the formals | |
1221 | -- visible in a separate step. | |
1222 | ||
0a36105d | 1223 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1224 | |
1225 | declare | |
1226 | E : Entity_Id; | |
1227 | First_Ent : Entity_Id; | |
1228 | ||
1229 | begin | |
1230 | First_Ent := First_Entity (Gen_Id); | |
1231 | ||
1232 | E := First_Ent; | |
1233 | while Present (E) and then not Is_Formal (E) loop | |
1234 | Install_Entity (E); | |
1235 | Next_Entity (E); | |
1236 | end loop; | |
1237 | ||
1238 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1239 | ||
1240 | -- Now generic formals are visible, and the specification can be | |
1241 | -- analyzed, for subsequent conformance check. | |
1242 | ||
fbf5a39b | 1243 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1244 | |
fbf5a39b | 1245 | -- Make formal parameters visible |
996ae0b0 RK |
1246 | |
1247 | if Present (E) then | |
1248 | ||
fbf5a39b AC |
1249 | -- E is the first formal parameter, we loop through the formals |
1250 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1251 | |
1252 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1253 | while Present (E) loop |
1254 | Install_Entity (E); | |
1255 | Next_Formal (E); | |
1256 | end loop; | |
1257 | end if; | |
1258 | ||
e895b435 | 1259 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1260 | |
ec4867fa ES |
1261 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
1262 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
1263 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1264 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1265 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
c5cec2fe AC |
1266 | |
1267 | -- Inherit the "ghostness" of the generic spec. Note that this | |
1268 | -- property is not directly inherited as the body may be subject | |
1269 | -- to a different Ghost assertion policy. | |
1270 | ||
8636f52f | 1271 | if Is_Ghost_Entity (Gen_Id) or else Ghost_Mode > None then |
c5cec2fe AC |
1272 | Set_Is_Ghost_Entity (Body_Id); |
1273 | ||
1274 | -- The Ghost policy in effect at the point of declaration and at | |
c2cfccb1 | 1275 | -- the point of completion must match (SPARK RM 6.9(14)). |
c5cec2fe AC |
1276 | |
1277 | Check_Ghost_Completion (Gen_Id, Body_Id); | |
1278 | end if; | |
1279 | ||
fbf5a39b AC |
1280 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1281 | ||
1282 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1283 | ||
e895b435 | 1284 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1285 | |
1286 | Set_Ekind (Gen_Id, Kind); | |
1287 | Set_Ekind (Body_Id, Kind); | |
1288 | ||
1289 | if Present (First_Ent) then | |
1290 | Set_First_Entity (Gen_Id, First_Ent); | |
1291 | end if; | |
1292 | ||
1293 | End_Scope; | |
1294 | return; | |
1295 | end if; | |
996ae0b0 | 1296 | |
82c80734 RD |
1297 | -- If this is a compilation unit, it must be made visible explicitly, |
1298 | -- because the compilation of the declaration, unlike other library | |
1299 | -- unit declarations, does not. If it is not a unit, the following | |
1300 | -- is redundant but harmless. | |
996ae0b0 RK |
1301 | |
1302 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1303 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1304 | |
ec4867fa ES |
1305 | if Is_Child_Unit (Gen_Id) then |
1306 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1307 | end if; | |
1308 | ||
996ae0b0 | 1309 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 | 1310 | |
579847c2 AC |
1311 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
1312 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
1313 | ||
caf07df9 AC |
1314 | -- Analyze any aspect specifications that appear on the generic |
1315 | -- subprogram body. | |
1316 | ||
1317 | if Has_Aspects (N) then | |
1318 | Analyze_Aspect_Specifications_On_Body_Or_Stub (N); | |
1319 | end if; | |
1320 | ||
996ae0b0 RK |
1321 | Analyze_Declarations (Declarations (N)); |
1322 | Check_Completion; | |
996ae0b0 | 1323 | |
caf07df9 AC |
1324 | -- When a generic subprogram body appears inside a package, its |
1325 | -- contract is analyzed at the end of the package body declarations. | |
1326 | -- This is due to the delay with respect of the package contract upon | |
1327 | -- which the body contract may depend. When the generic subprogram | |
1328 | -- body is a compilation unit, this delay is not necessary. | |
1329 | ||
1330 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1331 | Analyze_Subprogram_Body_Contract (Body_Id); | |
1332 | ||
1333 | -- Capture all global references in a generic subprogram body | |
1334 | -- that acts as a compilation unit now that the contract has | |
1335 | -- been analyzed. | |
1336 | ||
1337 | Save_Global_References_In_Contract | |
1338 | (Templ => Original_Node (N), | |
1339 | Gen_Id => Gen_Id); | |
1340 | end if; | |
1341 | ||
1342 | Analyze (Handled_Statement_Sequence (N)); | |
996ae0b0 RK |
1343 | Save_Global_References (Original_Node (N)); |
1344 | ||
82c80734 RD |
1345 | -- Prior to exiting the scope, include generic formals again (if any |
1346 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1347 | |
1348 | if Present (First_Ent) then | |
1349 | Set_First_Entity (Gen_Id, First_Ent); | |
1350 | end if; | |
1351 | ||
fbf5a39b | 1352 | Check_References (Gen_Id); |
996ae0b0 RK |
1353 | end; |
1354 | ||
e6f69614 | 1355 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1356 | End_Scope; |
1357 | Check_Subprogram_Order (N); | |
1358 | ||
e895b435 | 1359 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1360 | |
1361 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1362 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1363 | |
1364 | if Style_Check then | |
1365 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1366 | end if; | |
13d923cc | 1367 | |
996ae0b0 | 1368 | End_Generic; |
996ae0b0 RK |
1369 | end Analyze_Generic_Subprogram_Body; |
1370 | ||
4d8f3296 ES |
1371 | ---------------------------- |
1372 | -- Analyze_Null_Procedure -- | |
1373 | ---------------------------- | |
1374 | ||
1375 | procedure Analyze_Null_Procedure | |
1376 | (N : Node_Id; | |
1377 | Is_Completion : out Boolean) | |
1378 | is | |
1379 | Loc : constant Source_Ptr := Sloc (N); | |
1380 | Spec : constant Node_Id := Specification (N); | |
1381 | Designator : Entity_Id; | |
1382 | Form : Node_Id; | |
1383 | Null_Body : Node_Id := Empty; | |
1384 | Prev : Entity_Id; | |
1385 | ||
1386 | begin | |
1387 | -- Capture the profile of the null procedure before analysis, for | |
1388 | -- expansion at the freeze point and at each point of call. The body is | |
1389 | -- used if the procedure has preconditions, or if it is a completion. In | |
1390 | -- the first case the body is analyzed at the freeze point, in the other | |
1391 | -- it replaces the null procedure declaration. | |
1392 | ||
1393 | Null_Body := | |
1394 | Make_Subprogram_Body (Loc, | |
1395 | Specification => New_Copy_Tree (Spec), | |
8c35b40a | 1396 | Declarations => New_List, |
4d8f3296 ES |
1397 | Handled_Statement_Sequence => |
1398 | Make_Handled_Sequence_Of_Statements (Loc, | |
1399 | Statements => New_List (Make_Null_Statement (Loc)))); | |
1400 | ||
1401 | -- Create new entities for body and formals | |
1402 | ||
1403 | Set_Defining_Unit_Name (Specification (Null_Body), | |
9d2a2071 AC |
1404 | Make_Defining_Identifier |
1405 | (Sloc (Defining_Entity (N)), | |
1406 | Chars (Defining_Entity (N)))); | |
4d8f3296 ES |
1407 | |
1408 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1409 | while Present (Form) loop | |
1410 | Set_Defining_Identifier (Form, | |
9d2a2071 AC |
1411 | Make_Defining_Identifier |
1412 | (Sloc (Defining_Identifier (Form)), | |
1413 | Chars (Defining_Identifier (Form)))); | |
4d8f3296 ES |
1414 | Next (Form); |
1415 | end loop; | |
1416 | ||
1417 | -- Determine whether the null procedure may be a completion of a generic | |
1418 | -- suprogram, in which case we use the new null body as the completion | |
1419 | -- and set minimal semantic information on the original declaration, | |
1420 | -- which is rewritten as a null statement. | |
1421 | ||
1422 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
1423 | ||
1424 | if Present (Prev) and then Is_Generic_Subprogram (Prev) then | |
1425 | Insert_Before (N, Null_Body); | |
1426 | Set_Ekind (Defining_Entity (N), Ekind (Prev)); | |
4d8f3296 ES |
1427 | |
1428 | Rewrite (N, Make_Null_Statement (Loc)); | |
1429 | Analyze_Generic_Subprogram_Body (Null_Body, Prev); | |
1430 | Is_Completion := True; | |
1431 | return; | |
1432 | ||
1433 | else | |
4d8f3296 ES |
1434 | -- Resolve the types of the formals now, because the freeze point |
1435 | -- may appear in a different context, e.g. an instantiation. | |
1436 | ||
1437 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1438 | while Present (Form) loop | |
1439 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
1440 | Find_Type (Parameter_Type (Form)); | |
1441 | ||
1442 | elsif | |
1443 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
1444 | then | |
1445 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
1446 | ||
1447 | else | |
1448 | -- The case of a null procedure with a formal that is an | |
1449 | -- access_to_subprogram type, and that is used as an actual | |
1450 | -- in an instantiation is left to the enthusiastic reader. | |
1451 | ||
1452 | null; | |
1453 | end if; | |
1454 | ||
1455 | Next (Form); | |
1456 | end loop; | |
1457 | end if; | |
1458 | ||
1459 | -- If there are previous overloadable entities with the same name, | |
1460 | -- check whether any of them is completed by the null procedure. | |
1461 | ||
1462 | if Present (Prev) and then Is_Overloadable (Prev) then | |
1463 | Designator := Analyze_Subprogram_Specification (Spec); | |
1464 | Prev := Find_Corresponding_Spec (N); | |
1465 | end if; | |
1466 | ||
1467 | if No (Prev) or else not Comes_From_Source (Prev) then | |
1468 | Designator := Analyze_Subprogram_Specification (Spec); | |
1469 | Set_Has_Completion (Designator); | |
1470 | ||
1471 | -- Signal to caller that this is a procedure declaration | |
1472 | ||
1473 | Is_Completion := False; | |
1474 | ||
1475 | -- Null procedures are always inlined, but generic formal subprograms | |
1476 | -- which appear as such in the internal instance of formal packages, | |
1477 | -- need no completion and are not marked Inline. | |
1478 | ||
1479 | if Expander_Active | |
1480 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
1481 | then | |
1482 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
1483 | Set_Body_To_Inline (N, Null_Body); | |
1484 | Set_Is_Inlined (Designator); | |
1485 | end if; | |
1486 | ||
1487 | else | |
2fe258bf AC |
1488 | -- The null procedure is a completion. We unconditionally rewrite |
1489 | -- this as a null body (even if expansion is not active), because | |
1490 | -- there are various error checks that are applied on this body | |
1491 | -- when it is analyzed (e.g. correct aspect placement). | |
4d8f3296 | 1492 | |
a98480dd AC |
1493 | if Has_Completion (Prev) then |
1494 | Error_Msg_Sloc := Sloc (Prev); | |
1495 | Error_Msg_NE ("duplicate body for & declared#", N, Prev); | |
1496 | end if; | |
1497 | ||
4d8f3296 | 1498 | Is_Completion := True; |
2fe258bf AC |
1499 | Rewrite (N, Null_Body); |
1500 | Analyze (N); | |
4d8f3296 ES |
1501 | end if; |
1502 | end Analyze_Null_Procedure; | |
1503 | ||
996ae0b0 RK |
1504 | ----------------------------- |
1505 | -- Analyze_Operator_Symbol -- | |
1506 | ----------------------------- | |
1507 | ||
82c80734 RD |
1508 | -- An operator symbol such as "+" or "and" may appear in context where the |
1509 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1510 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1511 | -- generates this node, and the semantics does the disambiguation. Other | |
1512 | -- such case are actuals in an instantiation, the generic unit in an | |
1513 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1514 | |
1515 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1516 | Par : constant Node_Id := Parent (N); | |
1517 | ||
1518 | begin | |
1f0b1e48 | 1519 | if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
996ae0b0 | 1520 | or else Nkind (Par) = N_Function_Instantiation |
1f0b1e48 | 1521 | or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
996ae0b0 | 1522 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1f0b1e48 | 1523 | and then not Is_Pragma_String_Literal (Par)) |
996ae0b0 | 1524 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
800621e0 RD |
1525 | or else (Nkind (Par) = N_Attribute_Reference |
1526 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1527 | then |
1528 | Find_Direct_Name (N); | |
1529 | ||
1530 | else | |
1531 | Change_Operator_Symbol_To_String_Literal (N); | |
1532 | Analyze (N); | |
1533 | end if; | |
1534 | end Analyze_Operator_Symbol; | |
1535 | ||
1536 | ----------------------------------- | |
1537 | -- Analyze_Parameter_Association -- | |
1538 | ----------------------------------- | |
1539 | ||
1540 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1541 | begin | |
1542 | Analyze (Explicit_Actual_Parameter (N)); | |
1543 | end Analyze_Parameter_Association; | |
1544 | ||
1545 | ---------------------------- | |
1546 | -- Analyze_Procedure_Call -- | |
1547 | ---------------------------- | |
1548 | ||
1549 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
241ebe89 | 1550 | GM : constant Ghost_Mode_Type := Ghost_Mode; |
996ae0b0 RK |
1551 | |
1552 | procedure Analyze_Call_And_Resolve; | |
1553 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1554 | -- At end, check illegal order dependence. |
996ae0b0 | 1555 | |
241ebe89 HK |
1556 | procedure Restore_Globals; |
1557 | -- Restore the values of all saved global variables | |
1558 | ||
fbf5a39b AC |
1559 | ------------------------------ |
1560 | -- Analyze_Call_And_Resolve -- | |
1561 | ------------------------------ | |
1562 | ||
996ae0b0 RK |
1563 | procedure Analyze_Call_And_Resolve is |
1564 | begin | |
1565 | if Nkind (N) = N_Procedure_Call_Statement then | |
1566 | Analyze_Call (N); | |
1567 | Resolve (N, Standard_Void_Type); | |
1568 | else | |
1569 | Analyze (N); | |
1570 | end if; | |
1571 | end Analyze_Call_And_Resolve; | |
1572 | ||
241ebe89 HK |
1573 | --------------------- |
1574 | -- Restore_Globals -- | |
1575 | --------------------- | |
1576 | ||
1577 | procedure Restore_Globals is | |
1578 | begin | |
1579 | Ghost_Mode := GM; | |
1580 | end Restore_Globals; | |
1581 | ||
1582 | -- Local variables | |
1583 | ||
1584 | Actuals : constant List_Id := Parameter_Associations (N); | |
1585 | Loc : constant Source_Ptr := Sloc (N); | |
1586 | P : constant Node_Id := Name (N); | |
1587 | Actual : Node_Id; | |
1588 | New_N : Node_Id; | |
1589 | ||
996ae0b0 RK |
1590 | -- Start of processing for Analyze_Procedure_Call |
1591 | ||
1592 | begin | |
1593 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1594 | -- a procedure call or an entry call. The prefix may denote an access | |
1595 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1596 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1597 | -- then the construct denotes a call to a member of an entire family. |
1598 | -- If the prefix is a simple name, it may still denote a call to a | |
1599 | -- parameterless member of an entry family. Resolution of these various | |
1600 | -- interpretations is delicate. | |
1601 | ||
1602 | Analyze (P); | |
1603 | ||
758c442c GD |
1604 | -- If this is a call of the form Obj.Op, the call may have been |
1605 | -- analyzed and possibly rewritten into a block, in which case | |
1606 | -- we are done. | |
1607 | ||
1608 | if Analyzed (N) then | |
1609 | return; | |
1610 | end if; | |
1611 | ||
7415029d AC |
1612 | -- If there is an error analyzing the name (which may have been |
1613 | -- rewritten if the original call was in prefix notation) then error | |
1614 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1615 | |
21791d97 | 1616 | if Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
996ae0b0 RK |
1617 | Set_Etype (N, Any_Type); |
1618 | return; | |
1619 | end if; | |
1620 | ||
8636f52f HK |
1621 | -- The name of the procedure call may reference an entity subject to |
1622 | -- pragma Ghost with policy Ignore. Set the mode now to ensure that any | |
1623 | -- nodes generated during analysis and expansion are properly flagged as | |
1624 | -- ignored Ghost. | |
1625 | ||
1626 | Set_Ghost_Mode (N); | |
1627 | ||
996ae0b0 RK |
1628 | -- Otherwise analyze the parameters |
1629 | ||
1630 | if Present (Actuals) then | |
1631 | Actual := First (Actuals); | |
1632 | ||
1633 | while Present (Actual) loop | |
1634 | Analyze (Actual); | |
1635 | Check_Parameterless_Call (Actual); | |
1636 | Next (Actual); | |
1637 | end loop; | |
1638 | end if; | |
1639 | ||
0bfc9a64 | 1640 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1641 | |
1642 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a AC |
1643 | and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
1644 | Name_Elab_Body, | |
1645 | Name_Elab_Subp_Body) | |
996ae0b0 RK |
1646 | then |
1647 | if Present (Actuals) then | |
1648 | Error_Msg_N | |
1649 | ("no parameters allowed for this call", First (Actuals)); | |
1650 | return; | |
1651 | end if; | |
1652 | ||
1653 | Set_Etype (N, Standard_Void_Type); | |
1654 | Set_Analyzed (N); | |
1655 | ||
1656 | elsif Is_Entity_Name (P) | |
1657 | and then Is_Record_Type (Etype (Entity (P))) | |
1658 | and then Remote_AST_I_Dereference (P) | |
1659 | then | |
241ebe89 | 1660 | Restore_Globals; |
996ae0b0 RK |
1661 | return; |
1662 | ||
1663 | elsif Is_Entity_Name (P) | |
1664 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1665 | then | |
1666 | if Is_Access_Type (Etype (P)) | |
1667 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1668 | and then No (Actuals) | |
1669 | and then Comes_From_Source (N) | |
1670 | then | |
ed2233dc | 1671 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1672 | end if; |
1673 | ||
1674 | Analyze_Call_And_Resolve; | |
1675 | ||
1676 | -- If the prefix is the simple name of an entry family, this is | |
1677 | -- a parameterless call from within the task body itself. | |
1678 | ||
1679 | elsif Is_Entity_Name (P) | |
1680 | and then Nkind (P) = N_Identifier | |
1681 | and then Ekind (Entity (P)) = E_Entry_Family | |
1682 | and then Present (Actuals) | |
1683 | and then No (Next (First (Actuals))) | |
1684 | then | |
82c80734 RD |
1685 | -- Can be call to parameterless entry family. What appears to be the |
1686 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1687 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1688 | -- transformation. |
1689 | ||
1690 | New_N := | |
1691 | Make_Indexed_Component (Loc, | |
1692 | Prefix => | |
1693 | Make_Selected_Component (Loc, | |
1694 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1695 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1696 | Expressions => Actuals); | |
1697 | Set_Name (N, New_N); | |
1698 | Set_Etype (New_N, Standard_Void_Type); | |
1699 | Set_Parameter_Associations (N, No_List); | |
1700 | Analyze_Call_And_Resolve; | |
1701 | ||
1702 | elsif Nkind (P) = N_Explicit_Dereference then | |
1703 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1704 | Analyze_Call_And_Resolve; | |
1705 | else | |
1706 | Error_Msg_N ("expect access to procedure in call", P); | |
1707 | end if; | |
1708 | ||
82c80734 RD |
1709 | -- The name can be a selected component or an indexed component that |
1710 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1711 | -- has parameter associations. | |
996ae0b0 RK |
1712 | |
1713 | elsif Is_Access_Type (Etype (P)) | |
1714 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1715 | then | |
1716 | if Present (Actuals) then | |
1717 | Analyze_Call_And_Resolve; | |
1718 | else | |
ed2233dc | 1719 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1720 | end if; |
1721 | ||
82c80734 RD |
1722 | -- If not an access to subprogram, then the prefix must resolve to the |
1723 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1724 | |
82c80734 RD |
1725 | -- For the case of a simple entry call, P is a selected component where |
1726 | -- the prefix is the task and the selector name is the entry. A call to | |
1727 | -- a protected procedure will have the same syntax. If the protected | |
1728 | -- object contains overloaded operations, the entity may appear as a | |
1729 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1730 | |
1731 | elsif Nkind (P) = N_Selected_Component | |
8fde064e AC |
1732 | and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
1733 | E_Procedure, | |
1734 | E_Function) | |
996ae0b0 RK |
1735 | then |
1736 | Analyze_Call_And_Resolve; | |
1737 | ||
1738 | elsif Nkind (P) = N_Selected_Component | |
1739 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1740 | and then Present (Actuals) | |
1741 | and then No (Next (First (Actuals))) | |
1742 | then | |
82c80734 RD |
1743 | -- Can be call to parameterless entry family. What appears to be the |
1744 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1745 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1746 | -- transformation. |
1747 | ||
1748 | New_N := | |
1749 | Make_Indexed_Component (Loc, | |
1750 | Prefix => New_Copy (P), | |
1751 | Expressions => Actuals); | |
1752 | Set_Name (N, New_N); | |
1753 | Set_Etype (New_N, Standard_Void_Type); | |
1754 | Set_Parameter_Associations (N, No_List); | |
1755 | Analyze_Call_And_Resolve; | |
1756 | ||
1757 | -- For the case of a reference to an element of an entry family, P is | |
1758 | -- an indexed component whose prefix is a selected component (task and | |
1759 | -- entry family), and whose index is the entry family index. | |
1760 | ||
1761 | elsif Nkind (P) = N_Indexed_Component | |
1762 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1763 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1764 | then | |
1765 | Analyze_Call_And_Resolve; | |
1766 | ||
1767 | -- If the prefix is the name of an entry family, it is a call from | |
1768 | -- within the task body itself. | |
1769 | ||
1770 | elsif Nkind (P) = N_Indexed_Component | |
1771 | and then Nkind (Prefix (P)) = N_Identifier | |
1772 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1773 | then | |
1774 | New_N := | |
1775 | Make_Selected_Component (Loc, | |
1776 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1777 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1778 | Rewrite (Prefix (P), New_N); | |
1779 | Analyze (P); | |
1780 | Analyze_Call_And_Resolve; | |
1781 | ||
9f8d1e5c AC |
1782 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
1783 | -- procedure name, so the construct can only be a qualified expression. | |
1784 | ||
1785 | elsif Nkind (P) = N_Qualified_Expression | |
1786 | and then Ada_Version >= Ada_2012 | |
1787 | then | |
1788 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
1789 | Analyze (N); | |
1790 | ||
e895b435 | 1791 | -- Anything else is an error |
996ae0b0 RK |
1792 | |
1793 | else | |
758c442c | 1794 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 | 1795 | end if; |
241ebe89 HK |
1796 | |
1797 | Restore_Globals; | |
996ae0b0 RK |
1798 | end Analyze_Procedure_Call; |
1799 | ||
b0186f71 AC |
1800 | ------------------------------ |
1801 | -- Analyze_Return_Statement -- | |
1802 | ------------------------------ | |
1803 | ||
1804 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1805 | ||
1806 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1807 | N_Extended_Return_Statement)); | |
1808 | ||
1809 | Returns_Object : constant Boolean := | |
1810 | Nkind (N) = N_Extended_Return_Statement | |
1811 | or else | |
8fde064e AC |
1812 | (Nkind (N) = N_Simple_Return_Statement |
1813 | and then Present (Expression (N))); | |
b0186f71 AC |
1814 | -- True if we're returning something; that is, "return <expression>;" |
1815 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1816 | -- checking: If Returns_Object is True, N should apply to a function | |
1817 | -- body; otherwise N should apply to a procedure body, entry body, | |
1818 | -- accept statement, or extended return statement. | |
1819 | ||
1820 | function Find_What_It_Applies_To return Entity_Id; | |
1821 | -- Find the entity representing the innermost enclosing body, accept | |
1822 | -- statement, or extended return statement. If the result is a callable | |
1823 | -- construct or extended return statement, then this will be the value | |
1824 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1825 | -- illegal. See RM-6.5(4/2). | |
1826 | ||
1827 | ----------------------------- | |
1828 | -- Find_What_It_Applies_To -- | |
1829 | ----------------------------- | |
1830 | ||
1831 | function Find_What_It_Applies_To return Entity_Id is | |
1832 | Result : Entity_Id := Empty; | |
1833 | ||
1834 | begin | |
36b8f95f AC |
1835 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1836 | -- and postconditions. | |
b0186f71 AC |
1837 | |
1838 | for J in reverse 0 .. Scope_Stack.Last loop | |
1839 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1840 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1841 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1842 | end loop; |
1843 | ||
1844 | pragma Assert (Present (Result)); | |
1845 | return Result; | |
1846 | end Find_What_It_Applies_To; | |
1847 | ||
1848 | -- Local declarations | |
1849 | ||
1850 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1851 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1852 | Loc : constant Source_Ptr := Sloc (N); | |
1853 | Stm_Entity : constant Entity_Id := | |
1854 | New_Internal_Entity | |
1855 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1856 | ||
1857 | -- Start of processing for Analyze_Return_Statement | |
1858 | ||
1859 | begin | |
1860 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1861 | ||
1862 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1863 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1864 | ||
1865 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1866 | -- (4/2): an inner return statement will apply to this extended return. | |
1867 | ||
1868 | if Nkind (N) = N_Extended_Return_Statement then | |
1869 | Push_Scope (Stm_Entity); | |
1870 | end if; | |
1871 | ||
1872 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1873 | -- implicitly-generated return that is placed at the end. | |
1874 | ||
1875 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1876 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1877 | end if; | |
1878 | ||
1879 | -- Warn on any unassigned OUT parameters if in procedure | |
1880 | ||
1881 | if Ekind (Scope_Id) = E_Procedure then | |
1882 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1883 | end if; | |
1884 | ||
1885 | -- Check that functions return objects, and other things do not | |
1886 | ||
1887 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1888 | if not Returns_Object then | |
1889 | Error_Msg_N ("missing expression in return from function", N); | |
1890 | end if; | |
1891 | ||
1892 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1893 | if Returns_Object then | |
1894 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1895 | end if; | |
1896 | ||
1897 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1898 | if Returns_Object then | |
1899 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1900 | Error_Msg_N ("entry body cannot return value", N); | |
1901 | else | |
1902 | Error_Msg_N ("accept statement cannot return value", N); | |
1903 | end if; | |
1904 | end if; | |
1905 | ||
1906 | elsif Kind = E_Return_Statement then | |
1907 | ||
1908 | -- We are nested within another return statement, which must be an | |
1909 | -- extended_return_statement. | |
1910 | ||
1911 | if Returns_Object then | |
d0dcb2b1 AC |
1912 | if Nkind (N) = N_Extended_Return_Statement then |
1913 | Error_Msg_N | |
cc96a1b8 | 1914 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
1915 | N); |
1916 | ||
1917 | -- Case of a simple return statement with a value inside extended | |
1918 | -- return statement. | |
1919 | ||
1920 | else | |
1921 | Error_Msg_N | |
3ccedacc AC |
1922 | ("return nested in extended return statement cannot return " |
1923 | & "value (use `RETURN;`)", N); | |
d0dcb2b1 | 1924 | end if; |
b0186f71 AC |
1925 | end if; |
1926 | ||
1927 | else | |
1928 | Error_Msg_N ("illegal context for return statement", N); | |
1929 | end if; | |
1930 | ||
1931 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1932 | Analyze_Function_Return (N); | |
1933 | ||
1934 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1935 | Set_Return_Present (Scope_Id); | |
1936 | end if; | |
1937 | ||
1938 | if Nkind (N) = N_Extended_Return_Statement then | |
1939 | End_Scope; | |
1940 | end if; | |
1941 | ||
1942 | Kill_Current_Values (Last_Assignment_Only => True); | |
1943 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
1944 | |
1945 | Analyze_Dimension (N); | |
b0186f71 AC |
1946 | end Analyze_Return_Statement; |
1947 | ||
5d37ba92 ES |
1948 | ------------------------------------- |
1949 | -- Analyze_Simple_Return_Statement -- | |
1950 | ------------------------------------- | |
ec4867fa | 1951 | |
5d37ba92 | 1952 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1953 | begin |
5d37ba92 ES |
1954 | if Present (Expression (N)) then |
1955 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1956 | end if; |
1957 | ||
5d37ba92 ES |
1958 | Analyze_Return_Statement (N); |
1959 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1960 | |
82c80734 RD |
1961 | ------------------------- |
1962 | -- Analyze_Return_Type -- | |
1963 | ------------------------- | |
1964 | ||
1965 | procedure Analyze_Return_Type (N : Node_Id) is | |
1966 | Designator : constant Entity_Id := Defining_Entity (N); | |
1967 | Typ : Entity_Id := Empty; | |
1968 | ||
1969 | begin | |
ec4867fa ES |
1970 | -- Normal case where result definition does not indicate an error |
1971 | ||
41251c60 JM |
1972 | if Result_Definition (N) /= Error then |
1973 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
ce5ba43a | 1974 | Check_SPARK_05_Restriction |
fe5d3068 | 1975 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1976 | |
b1c11e0e JM |
1977 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1978 | ||
1979 | declare | |
1980 | AD : constant Node_Id := | |
1981 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1982 | begin | |
1983 | if Present (AD) and then Protected_Present (AD) then | |
1984 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1985 | else | |
1986 | Typ := Access_Definition (N, Result_Definition (N)); | |
1987 | end if; | |
1988 | end; | |
1989 | ||
41251c60 JM |
1990 | Set_Parent (Typ, Result_Definition (N)); |
1991 | Set_Is_Local_Anonymous_Access (Typ); | |
1992 | Set_Etype (Designator, Typ); | |
1993 | ||
b66c3ff4 AC |
1994 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1995 | ||
1996 | Null_Exclusion_Static_Checks (N); | |
1997 | ||
41251c60 JM |
1998 | -- Subtype_Mark case |
1999 | ||
2000 | else | |
2001 | Find_Type (Result_Definition (N)); | |
2002 | Typ := Entity (Result_Definition (N)); | |
2003 | Set_Etype (Designator, Typ); | |
2004 | ||
2ba431e5 | 2005 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 2006 | |
8fde064e | 2007 | if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
ce5ba43a | 2008 | Check_SPARK_05_Restriction |
fe5d3068 | 2009 | ("returning an unconstrained array is not allowed", |
7394c8cc | 2010 | Result_Definition (N)); |
daec8eeb YM |
2011 | end if; |
2012 | ||
b66c3ff4 AC |
2013 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
2014 | ||
2015 | Null_Exclusion_Static_Checks (N); | |
2016 | ||
2017 | -- If a null exclusion is imposed on the result type, then create | |
2018 | -- a null-excluding itype (an access subtype) and use it as the | |
2019 | -- function's Etype. Note that the null exclusion checks are done | |
2020 | -- right before this, because they don't get applied to types that | |
2021 | -- do not come from source. | |
2022 | ||
8fde064e | 2023 | if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
b66c3ff4 AC |
2024 | Set_Etype (Designator, |
2025 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
2026 | (T => Typ, |
2027 | Related_Nod => N, | |
2028 | Scope_Id => Scope (Current_Scope))); | |
2029 | ||
2030 | -- The new subtype must be elaborated before use because | |
2031 | -- it is visible outside of the function. However its base | |
2032 | -- type may not be frozen yet, so the reference that will | |
2033 | -- force elaboration must be attached to the freezing of | |
2034 | -- the base type. | |
2035 | ||
212863c0 AC |
2036 | -- If the return specification appears on a proper body, |
2037 | -- the subtype will have been created already on the spec. | |
2038 | ||
ff7139c3 | 2039 | if Is_Frozen (Typ) then |
212863c0 AC |
2040 | if Nkind (Parent (N)) = N_Subprogram_Body |
2041 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
2042 | then | |
2043 | null; | |
2044 | else | |
2045 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
2046 | end if; | |
2047 | ||
ff7139c3 AC |
2048 | else |
2049 | Ensure_Freeze_Node (Typ); | |
2050 | ||
2051 | declare | |
212863c0 | 2052 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
2053 | begin |
2054 | Set_Itype (IR, Etype (Designator)); | |
2055 | Append_Freeze_Actions (Typ, New_List (IR)); | |
2056 | end; | |
2057 | end if; | |
2058 | ||
b66c3ff4 AC |
2059 | else |
2060 | Set_Etype (Designator, Typ); | |
2061 | end if; | |
2062 | ||
41251c60 | 2063 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
2064 | and then Is_Value_Type (Typ) |
2065 | then | |
2066 | null; | |
2067 | ||
2068 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 | 2069 | or else (Is_Class_Wide_Type (Typ) |
4b6f99f5 | 2070 | and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
41251c60 | 2071 | then |
dd386db0 AC |
2072 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
2073 | -- parts. Untagged incomplete types are not allowed in bodies. | |
b973629e AC |
2074 | -- As a consequence, limited views cannot appear in a basic |
2075 | -- declaration that is itself within a body, because there is | |
2076 | -- no point at which the non-limited view will become visible. | |
dd386db0 AC |
2077 | |
2078 | if Ada_Version >= Ada_2012 then | |
b973629e AC |
2079 | if From_Limited_With (Typ) and then In_Package_Body then |
2080 | Error_Msg_NE | |
2081 | ("invalid use of incomplete type&", | |
3f80a182 | 2082 | Result_Definition (N), Typ); |
b973629e | 2083 | |
1ebc2612 AC |
2084 | -- The return type of a subprogram body cannot be of a |
2085 | -- formal incomplete type. | |
2086 | ||
2087 | elsif Is_Generic_Type (Typ) | |
2088 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2089 | then | |
2090 | Error_Msg_N | |
2091 | ("return type cannot be a formal incomplete type", | |
2092 | Result_Definition (N)); | |
2093 | ||
2094 | elsif Is_Class_Wide_Type (Typ) | |
2095 | and then Is_Generic_Type (Root_Type (Typ)) | |
2096 | and then Nkind (Parent (N)) = N_Subprogram_Body | |
2097 | then | |
2098 | Error_Msg_N | |
2099 | ("return type cannot be a formal incomplete type", | |
2100 | Result_Definition (N)); | |
2101 | ||
b973629e | 2102 | elsif Is_Tagged_Type (Typ) then |
dd386db0 AC |
2103 | null; |
2104 | ||
ed09416f AC |
2105 | -- Use is legal in a thunk generated for an operation |
2106 | -- inherited from a progenitor. | |
2107 | ||
2108 | elsif Is_Thunk (Designator) | |
2109 | and then Present (Non_Limited_View (Typ)) | |
2110 | then | |
2111 | null; | |
2112 | ||
5b6f12c7 | 2113 | elsif Nkind (Parent (N)) = N_Subprogram_Body |
31d922e3 AC |
2114 | or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
2115 | N_Entry_Body) | |
dd386db0 AC |
2116 | then |
2117 | Error_Msg_NE | |
2118 | ("invalid use of untagged incomplete type&", | |
2119 | Designator, Typ); | |
2120 | end if; | |
2121 | ||
63be2a5a | 2122 | -- The type must be completed in the current package. This |
31d922e3 | 2123 | -- is checked at the end of the package declaration when |
7b7a0c2b AC |
2124 | -- Taft-amendment types are identified. If the return type |
2125 | -- is class-wide, there is no required check, the type can | |
2126 | -- be a bona fide TAT. | |
63be2a5a AC |
2127 | |
2128 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 2129 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 2130 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
2131 | then |
2132 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
2133 | end if; | |
2134 | ||
dd386db0 AC |
2135 | else |
2136 | Error_Msg_NE | |
2137 | ("invalid use of incomplete type&", Designator, Typ); | |
2138 | end if; | |
41251c60 | 2139 | end if; |
82c80734 RD |
2140 | end if; |
2141 | ||
ec4867fa ES |
2142 | -- Case where result definition does indicate an error |
2143 | ||
82c80734 RD |
2144 | else |
2145 | Set_Etype (Designator, Any_Type); | |
2146 | end if; | |
2147 | end Analyze_Return_Type; | |
2148 | ||
996ae0b0 RK |
2149 | ----------------------------- |
2150 | -- Analyze_Subprogram_Body -- | |
2151 | ----------------------------- | |
2152 | ||
b1b543d2 BD |
2153 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
2154 | Loc : constant Source_Ptr := Sloc (N); | |
2155 | Body_Spec : constant Node_Id := Specification (N); | |
2156 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
2157 | ||
2158 | begin | |
2159 | if Debug_Flag_C then | |
2160 | Write_Str ("==> subprogram body "); | |
2161 | Write_Name (Chars (Body_Id)); | |
2162 | Write_Str (" from "); | |
2163 | Write_Location (Loc); | |
2164 | Write_Eol; | |
2165 | Indent; | |
2166 | end if; | |
2167 | ||
2168 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
2169 | ||
2170 | -- The real work is split out into the helper, so it can do "return;" | |
2171 | -- without skipping the debug output: | |
2172 | ||
2173 | Analyze_Subprogram_Body_Helper (N); | |
2174 | ||
2175 | if Debug_Flag_C then | |
2176 | Outdent; | |
2177 | Write_Str ("<== subprogram body "); | |
2178 | Write_Name (Chars (Body_Id)); | |
2179 | Write_Str (" from "); | |
2180 | Write_Location (Loc); | |
2181 | Write_Eol; | |
2182 | end if; | |
2183 | end Analyze_Subprogram_Body; | |
2184 | ||
ea3c0651 AC |
2185 | -------------------------------------- |
2186 | -- Analyze_Subprogram_Body_Contract -- | |
2187 | -------------------------------------- | |
2188 | ||
ab8843fa | 2189 | procedure Analyze_Subprogram_Body_Contract (Body_Id : Entity_Id) is |
caf07df9 AC |
2190 | Items : constant Node_Id := Contract (Body_Id); |
2191 | Mode : SPARK_Mode_Type; | |
2192 | Prag : Node_Id; | |
2193 | Prag_Nam : Name_Id; | |
2194 | Ref_Depends : Node_Id := Empty; | |
2195 | Ref_Global : Node_Id := Empty; | |
ea3c0651 | 2196 | |
caf07df9 AC |
2197 | begin |
2198 | -- When a subprogram body declaration is illegal, its defining entity is | |
2199 | -- left unanalyzed. There is nothing left to do in this case because the | |
2200 | -- body lacks a contract, or even a proper Ekind. | |
fc999c5d | 2201 | |
caf07df9 AC |
2202 | if Ekind (Body_Id) = E_Void then |
2203 | return; | |
2204 | end if; | |
c61ef416 | 2205 | |
caf07df9 AC |
2206 | -- Due to the timing of contract analysis, delayed pragmas may be |
2207 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
2208 | -- context. To remedy this, restore the original SPARK_Mode of the | |
2209 | -- related subprogram body. | |
ab8843fa | 2210 | |
caf07df9 | 2211 | Save_SPARK_Mode_And_Set (Body_Id, Mode); |
ab8843fa | 2212 | |
caf07df9 AC |
2213 | -- All subprograms carry a contract, but for some it is not significant |
2214 | -- and should not be processed. | |
c9d70ab1 | 2215 | |
caf07df9 AC |
2216 | if not Has_Significant_Contract (Body_Id) then |
2217 | null; | |
c9d70ab1 | 2218 | |
caf07df9 AC |
2219 | -- The subprogram body is a completion, analyze all delayed pragmas that |
2220 | -- apply. Note that when the body is stand alone, the pragmas are always | |
2221 | -- analyzed on the spot. | |
2c8d828a | 2222 | |
caf07df9 | 2223 | elsif Present (Items) then |
54e28df2 | 2224 | |
caf07df9 AC |
2225 | -- Locate and store pragmas Refined_Depends and Refined_Global since |
2226 | -- their order of analysis matters. | |
c9d70ab1 | 2227 | |
caf07df9 AC |
2228 | Prag := Classifications (Items); |
2229 | while Present (Prag) loop | |
2230 | Prag_Nam := Pragma_Name (Prag); | |
c9d70ab1 | 2231 | |
caf07df9 AC |
2232 | if Prag_Nam = Name_Refined_Depends then |
2233 | Ref_Depends := Prag; | |
2234 | ||
2235 | elsif Prag_Nam = Name_Refined_Global then | |
2236 | Ref_Global := Prag; | |
2237 | end if; | |
2238 | ||
2239 | Prag := Next_Pragma (Prag); | |
2240 | end loop; | |
ab8843fa | 2241 | |
c9d70ab1 AC |
2242 | -- Analyze Refined_Global first as Refined_Depends may mention items |
2243 | -- classified in the global refinement. | |
ab8843fa | 2244 | |
c9d70ab1 AC |
2245 | if Present (Ref_Global) then |
2246 | Analyze_Refined_Global_In_Decl_Part (Ref_Global); | |
c9d70ab1 | 2247 | end if; |
ab8843fa | 2248 | |
c9d70ab1 AC |
2249 | -- Refined_Depends must be analyzed after Refined_Global in order to |
2250 | -- see the modes of all global refinements. | |
2251 | ||
2252 | if Present (Ref_Depends) then | |
2253 | Analyze_Refined_Depends_In_Decl_Part (Ref_Depends); | |
ab8843fa | 2254 | end if; |
54e28df2 | 2255 | end if; |
c61ef416 | 2256 | |
c9d70ab1 AC |
2257 | -- Ensure that the contract cases or postconditions mention 'Result or |
2258 | -- define a post-state. | |
2259 | ||
2260 | Check_Result_And_Post_State (Body_Id); | |
2261 | ||
fc999c5d RD |
2262 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
2263 | -- pragmas have been analyzed. | |
2264 | ||
c61ef416 | 2265 | Restore_SPARK_Mode (Mode); |
ea3c0651 AC |
2266 | end Analyze_Subprogram_Body_Contract; |
2267 | ||
b1b543d2 BD |
2268 | ------------------------------------ |
2269 | -- Analyze_Subprogram_Body_Helper -- | |
2270 | ------------------------------------ | |
2271 | ||
996ae0b0 RK |
2272 | -- This procedure is called for regular subprogram bodies, generic bodies, |
2273 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
2274 | -- specification matters, and is used to create a proper declaration for | |
2275 | -- the subprogram, or to perform conformance checks. | |
2276 | ||
b1b543d2 | 2277 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
241ebe89 | 2278 | GM : constant Ghost_Mode_Type := Ghost_Mode; |
fbf5a39b | 2279 | Loc : constant Source_Ptr := Sloc (N); |
8d1fe980 | 2280 | Body_Spec : Node_Id := Specification (N); |
fbf5a39b AC |
2281 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); |
2282 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 2283 | Conformant : Boolean; |
21d27997 | 2284 | HSS : Node_Id; |
21d27997 RD |
2285 | Prot_Typ : Entity_Id := Empty; |
2286 | Spec_Id : Entity_Id; | |
2287 | Spec_Decl : Node_Id := Empty; | |
2288 | ||
2289 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
2290 | -- When we analyze a separate spec, the entity chain ends up containing | |
2291 | -- the formals, as well as any itypes generated during analysis of the | |
2292 | -- default expressions for parameters, or the arguments of associated | |
2293 | -- precondition/postcondition pragmas (which are analyzed in the context | |
2294 | -- of the spec since they have visibility on formals). | |
2295 | -- | |
2296 | -- These entities belong with the spec and not the body. However we do | |
2297 | -- the analysis of the body in the context of the spec (again to obtain | |
2298 | -- visibility to the formals), and all the entities generated during | |
2299 | -- this analysis end up also chained to the entity chain of the spec. | |
2300 | -- But they really belong to the body, and there is circuitry to move | |
2301 | -- them from the spec to the body. | |
2302 | -- | |
2303 | -- However, when we do this move, we don't want to move the real spec | |
2304 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
2305 | -- variable points to the last real spec entity, so we only move those | |
2306 | -- chained beyond that point. It is initialized to Empty to deal with | |
2307 | -- the case where there is no separate spec. | |
996ae0b0 | 2308 | |
ac072cb2 AC |
2309 | function Body_Has_Contract return Boolean; |
2310 | -- Check whether unanalyzed body has an aspect or pragma that may | |
1399d355 | 2311 | -- generate a SPARK contract. |
ac072cb2 | 2312 | |
8d1fe980 AC |
2313 | procedure Build_Subprogram_Declaration; |
2314 | -- Create a matching subprogram declaration for subprogram body N | |
2315 | ||
ec4867fa | 2316 | procedure Check_Anonymous_Return; |
e50e1c5e | 2317 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
2318 | -- or a type that contains tasks, we must create a master entity for |
2319 | -- the anonymous type, which typically will be used in an allocator | |
2320 | -- in the body of the function. | |
2321 | ||
e660dbf7 JM |
2322 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
2323 | -- Look ahead to recognize a pragma that may appear after the body. | |
2324 | -- If there is a previous spec, check that it appears in the same | |
2325 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
2326 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
2327 | -- If the body acts as a spec, and inlining is required, we create a | |
2328 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
2329 | -- If pragma does not appear after the body, check whether there is |
2330 | -- an inline pragma before any local declarations. | |
c37bb106 | 2331 | |
7665e4bd AC |
2332 | procedure Check_Missing_Return; |
2333 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
2334 | -- the warning checks implemented by Check_Returns. In formal mode, also |
2335 | -- verify that a function ends with a RETURN and that a procedure does | |
2336 | -- not contain any RETURN. | |
7665e4bd | 2337 | |
d44202ba HK |
2338 | function Disambiguate_Spec return Entity_Id; |
2339 | -- When a primitive is declared between the private view and the full | |
2340 | -- view of a concurrent type which implements an interface, a special | |
2341 | -- mechanism is used to find the corresponding spec of the primitive | |
2342 | -- body. | |
2343 | ||
5dcab3ca AC |
2344 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id); |
2345 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains | |
2346 | -- incomplete types coming from a limited context and swap their limited | |
2347 | -- views with the non-limited ones. | |
2348 | ||
d44202ba HK |
2349 | function Is_Private_Concurrent_Primitive |
2350 | (Subp_Id : Entity_Id) return Boolean; | |
2351 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
2352 | -- type that implements an interface and has a private view. | |
2353 | ||
241ebe89 HK |
2354 | procedure Restore_Globals; |
2355 | -- Restore the values of all saved global variables | |
2356 | ||
76a69663 ES |
2357 | procedure Set_Trivial_Subprogram (N : Node_Id); |
2358 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
2359 | -- subprogram whose body is being analyzed. N is the statement node | |
2360 | -- causing the flag to be set, if the following statement is a return | |
2361 | -- of an entity, we mark the entity as set in source to suppress any | |
2362 | -- warning on the stylized use of function stubs with a dummy return. | |
2363 | ||
758c442c GD |
2364 | procedure Verify_Overriding_Indicator; |
2365 | -- If there was a previous spec, the entity has been entered in the | |
2366 | -- current scope previously. If the body itself carries an overriding | |
2367 | -- indicator, check that it is consistent with the known status of the | |
2368 | -- entity. | |
2369 | ||
ac072cb2 AC |
2370 | ----------------------- |
2371 | -- Body_Has_Contract -- | |
2372 | ----------------------- | |
2373 | ||
2374 | function Body_Has_Contract return Boolean is | |
8d1fe980 AC |
2375 | Decls : constant List_Id := Declarations (N); |
2376 | Item : Node_Id; | |
ac072cb2 AC |
2377 | |
2378 | begin | |
8d1fe980 AC |
2379 | -- Check for unanalyzed aspects in the body that will generate a |
2380 | -- contract. | |
ac072cb2 AC |
2381 | |
2382 | if Present (Aspect_Specifications (N)) then | |
8d1fe980 AC |
2383 | Item := First (Aspect_Specifications (N)); |
2384 | while Present (Item) loop | |
2385 | if Is_Contract_Annotation (Item) then | |
ac072cb2 AC |
2386 | return True; |
2387 | end if; | |
2388 | ||
8d1fe980 | 2389 | Next (Item); |
ac072cb2 AC |
2390 | end loop; |
2391 | end if; | |
2392 | ||
1399d355 | 2393 | -- Check for pragmas that may generate a contract |
ac072cb2 AC |
2394 | |
2395 | if Present (Decls) then | |
8d1fe980 AC |
2396 | Item := First (Decls); |
2397 | while Present (Item) loop | |
2398 | if Nkind (Item) = N_Pragma | |
2399 | and then Is_Contract_Annotation (Item) | |
2400 | then | |
2401 | return True; | |
ac072cb2 AC |
2402 | end if; |
2403 | ||
8d1fe980 | 2404 | Next (Item); |
ac072cb2 AC |
2405 | end loop; |
2406 | end if; | |
2407 | ||
2408 | return False; | |
2409 | end Body_Has_Contract; | |
2410 | ||
8d1fe980 AC |
2411 | ---------------------------------- |
2412 | -- Build_Subprogram_Declaration -- | |
2413 | ---------------------------------- | |
2414 | ||
2415 | procedure Build_Subprogram_Declaration is | |
2416 | Asp : Node_Id; | |
2417 | Decl : Node_Id; | |
2418 | Subp_Decl : Node_Id; | |
2419 | ||
2420 | begin | |
2421 | -- Create a matching subprogram spec using the profile of the body. | |
2422 | -- The structure of the tree is identical, but has new entities for | |
2423 | -- the defining unit name and formal parameters. | |
2424 | ||
2425 | Subp_Decl := | |
2426 | Make_Subprogram_Declaration (Loc, | |
2427 | Specification => Copy_Subprogram_Spec (Body_Spec)); | |
2428 | ||
2429 | -- Relocate the aspects of the subprogram body to the new subprogram | |
2430 | -- spec because it acts as the initial declaration. | |
2431 | -- ??? what about pragmas | |
2432 | ||
2433 | Move_Aspects (N, To => Subp_Decl); | |
2434 | Insert_Before_And_Analyze (N, Subp_Decl); | |
2435 | ||
2436 | -- The analysis of the subprogram spec aspects may introduce pragmas | |
2437 | -- that need to be analyzed. | |
2438 | ||
2439 | Decl := Next (Subp_Decl); | |
2440 | while Present (Decl) loop | |
2441 | ||
2442 | -- Stop the search for pragmas once the body has been reached as | |
2443 | -- this terminates the region where pragmas may appear. | |
2444 | ||
2445 | if Decl = N then | |
2446 | exit; | |
2447 | ||
2448 | elsif Nkind (Decl) = N_Pragma then | |
2449 | Analyze (Decl); | |
2450 | end if; | |
2451 | ||
2452 | Next (Decl); | |
2453 | end loop; | |
2454 | ||
2455 | Spec_Id := Defining_Entity (Subp_Decl); | |
2456 | Set_Corresponding_Spec (N, Spec_Id); | |
2457 | ||
2458 | -- Mark the generated spec as a source construct to ensure that all | |
2459 | -- calls to it are properly registered in ALI files for GNATprove. | |
2460 | ||
2461 | Set_Comes_From_Source (Spec_Id, True); | |
2462 | ||
2463 | -- If aspect SPARK_Mode was specified on the body, it needs to be | |
2464 | -- repeated both on the generated spec and the body. | |
2465 | ||
2466 | Asp := Find_Aspect (Spec_Id, Aspect_SPARK_Mode); | |
2467 | ||
2468 | if Present (Asp) then | |
2469 | Asp := New_Copy_Tree (Asp); | |
2470 | Set_Analyzed (Asp, False); | |
2471 | Set_Aspect_Specifications (N, New_List (Asp)); | |
2472 | end if; | |
2473 | ||
2474 | -- Ensure that the specs of the subprogram declaration and its body | |
2475 | -- are identical, otherwise they will appear non-conformant due to | |
2476 | -- rewritings in the default values of formal parameters. | |
2477 | ||
2478 | Body_Spec := Copy_Subprogram_Spec (Body_Spec); | |
2479 | Set_Specification (N, Body_Spec); | |
2480 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); | |
2481 | end Build_Subprogram_Declaration; | |
2482 | ||
ec4867fa ES |
2483 | ---------------------------- |
2484 | -- Check_Anonymous_Return -- | |
2485 | ---------------------------- | |
2486 | ||
2487 | procedure Check_Anonymous_Return is | |
2488 | Decl : Node_Id; | |
a523b302 | 2489 | Par : Node_Id; |
ec4867fa ES |
2490 | Scop : Entity_Id; |
2491 | ||
2492 | begin | |
2493 | if Present (Spec_Id) then | |
2494 | Scop := Spec_Id; | |
2495 | else | |
2496 | Scop := Body_Id; | |
2497 | end if; | |
2498 | ||
2499 | if Ekind (Scop) = E_Function | |
2500 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 | 2501 | and then not Is_Thunk (Scop) |
4b963531 AC |
2502 | |
2503 | -- Skip internally built functions which handle the case of | |
2504 | -- a null access (see Expand_Interface_Conversion) | |
2505 | ||
2506 | and then not (Is_Interface (Designated_Type (Etype (Scop))) | |
4b6f99f5 | 2507 | and then not Comes_From_Source (Parent (Scop))) |
4b963531 | 2508 | |
a523b302 JM |
2509 | and then (Has_Task (Designated_Type (Etype (Scop))) |
2510 | or else | |
4b6f99f5 RD |
2511 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) |
2512 | and then | |
2513 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 2514 | and then Expander_Active |
b20de9b9 | 2515 | |
8fde064e | 2516 | -- Avoid cases with no tasking support |
b20de9b9 AC |
2517 | |
2518 | and then RTE_Available (RE_Current_Master) | |
2519 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
2520 | then |
2521 | Decl := | |
2522 | Make_Object_Declaration (Loc, | |
2523 | Defining_Identifier => | |
2524 | Make_Defining_Identifier (Loc, Name_uMaster), | |
2525 | Constant_Present => True, | |
2526 | Object_Definition => | |
e4494292 | 2527 | New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
ec4867fa ES |
2528 | Expression => |
2529 | Make_Explicit_Dereference (Loc, | |
e4494292 | 2530 | New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
ec4867fa ES |
2531 | |
2532 | if Present (Declarations (N)) then | |
2533 | Prepend (Decl, Declarations (N)); | |
2534 | else | |
2535 | Set_Declarations (N, New_List (Decl)); | |
2536 | end if; | |
2537 | ||
2538 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
2539 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
2540 | |
2541 | -- Now mark the containing scope as a task master | |
2542 | ||
2543 | Par := N; | |
2544 | while Nkind (Par) /= N_Compilation_Unit loop | |
2545 | Par := Parent (Par); | |
2546 | pragma Assert (Present (Par)); | |
2547 | ||
2548 | -- If we fall off the top, we are at the outer level, and | |
2549 | -- the environment task is our effective master, so nothing | |
2550 | -- to mark. | |
2551 | ||
2552 | if Nkind_In | |
2553 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
2554 | then | |
2555 | Set_Is_Task_Master (Par, True); | |
2556 | exit; | |
2557 | end if; | |
2558 | end loop; | |
ec4867fa ES |
2559 | end if; |
2560 | end Check_Anonymous_Return; | |
2561 | ||
e660dbf7 JM |
2562 | ------------------------- |
2563 | -- Check_Inline_Pragma -- | |
2564 | ------------------------- | |
758c442c | 2565 | |
e660dbf7 JM |
2566 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
2567 | Prag : Node_Id; | |
2568 | Plist : List_Id; | |
0fb2ea01 | 2569 | |
21d27997 | 2570 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 2571 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 2572 | -- to this subprogram. |
21d27997 RD |
2573 | |
2574 | ----------------------- | |
2575 | -- Is_Inline_Pragma -- | |
2576 | ----------------------- | |
2577 | ||
2578 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
2579 | begin | |
2580 | return | |
2581 | Nkind (N) = N_Pragma | |
2582 | and then | |
8fde064e | 2583 | (Pragma_Name (N) = Name_Inline_Always |
4b6f99f5 RD |
2584 | or else (Front_End_Inlining |
2585 | and then Pragma_Name (N) = Name_Inline)) | |
21d27997 | 2586 | and then |
8fde064e AC |
2587 | Chars |
2588 | (Expression (First (Pragma_Argument_Associations (N)))) = | |
2589 | Chars (Body_Id); | |
21d27997 RD |
2590 | end Is_Inline_Pragma; |
2591 | ||
2592 | -- Start of processing for Check_Inline_Pragma | |
2593 | ||
c37bb106 | 2594 | begin |
e660dbf7 JM |
2595 | if not Expander_Active then |
2596 | return; | |
2597 | end if; | |
2598 | ||
2599 | if Is_List_Member (N) | |
2600 | and then Present (Next (N)) | |
21d27997 | 2601 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2602 | then |
2603 | Prag := Next (N); | |
2604 | ||
21d27997 RD |
2605 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2606 | and then Present (Declarations (N)) | |
2607 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2608 | then | |
2609 | Prag := First (Declarations (N)); | |
2610 | ||
e660dbf7 JM |
2611 | else |
2612 | Prag := Empty; | |
c37bb106 | 2613 | end if; |
e660dbf7 JM |
2614 | |
2615 | if Present (Prag) then | |
2616 | if Present (Spec_Id) then | |
30196a76 | 2617 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
2618 | Analyze (Prag); |
2619 | end if; | |
2620 | ||
2621 | else | |
d39d6bb8 | 2622 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
2623 | |
2624 | declare | |
2625 | Subp : constant Entity_Id := | |
30196a76 | 2626 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 2627 | Decl : constant Node_Id := |
30196a76 RD |
2628 | Make_Subprogram_Declaration (Loc, |
2629 | Specification => | |
2630 | New_Copy_Tree (Specification (N))); | |
2631 | ||
e660dbf7 JM |
2632 | begin |
2633 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
2634 | ||
2635 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 2636 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2637 | Set_Parameter_Specifications |
2638 | (Specification (Decl), Plist); | |
2639 | end if; | |
2640 | ||
2641 | Insert_Before (N, Decl); | |
2642 | Analyze (Decl); | |
2643 | Analyze (Prag); | |
2644 | Set_Has_Pragma_Inline (Subp); | |
2645 | ||
76a69663 | 2646 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2647 | Set_Is_Inlined (Subp); |
21d27997 | 2648 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2649 | end if; |
2650 | ||
158d55fa AC |
2651 | -- Prior to copying the subprogram body to create a template |
2652 | -- for it for subsequent inlining, remove the pragma from | |
2653 | -- the current body so that the copy that will produce the | |
2654 | -- new body will start from a completely unanalyzed tree. | |
2655 | ||
2656 | if Nkind (Parent (Prag)) = N_Subprogram_Body then | |
2657 | Rewrite (Prag, Make_Null_Statement (Sloc (Prag))); | |
2658 | end if; | |
2659 | ||
e660dbf7 JM |
2660 | Spec := Subp; |
2661 | end; | |
2662 | end if; | |
2663 | end if; | |
2664 | end Check_Inline_Pragma; | |
2665 | ||
7665e4bd AC |
2666 | -------------------------- |
2667 | -- Check_Missing_Return -- | |
2668 | -------------------------- | |
2669 | ||
2670 | procedure Check_Missing_Return is | |
2671 | Id : Entity_Id; | |
2672 | Missing_Ret : Boolean; | |
2673 | ||
2674 | begin | |
2675 | if Nkind (Body_Spec) = N_Function_Specification then | |
2676 | if Present (Spec_Id) then | |
2677 | Id := Spec_Id; | |
2678 | else | |
2679 | Id := Body_Id; | |
2680 | end if; | |
2681 | ||
fe5d3068 | 2682 | if Return_Present (Id) then |
7665e4bd AC |
2683 | Check_Returns (HSS, 'F', Missing_Ret); |
2684 | ||
2685 | if Missing_Ret then | |
2686 | Set_Has_Missing_Return (Id); | |
2687 | end if; | |
2688 | ||
2aca76d6 AC |
2689 | elsif Is_Generic_Subprogram (Id) |
2690 | or else not Is_Machine_Code_Subprogram (Id) | |
7665e4bd AC |
2691 | then |
2692 | Error_Msg_N ("missing RETURN statement in function body", N); | |
2693 | end if; | |
2694 | ||
fe5d3068 | 2695 | -- If procedure with No_Return, check returns |
607d0635 | 2696 | |
fe5d3068 YM |
2697 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
2698 | and then Present (Spec_Id) | |
2699 | and then No_Return (Spec_Id) | |
607d0635 | 2700 | then |
fe5d3068 YM |
2701 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
2702 | end if; | |
2703 | ||
ad05f2e9 | 2704 | -- Special checks in SPARK mode |
fe5d3068 YM |
2705 | |
2706 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 2707 | |
ad05f2e9 | 2708 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
2709 | |
2710 | declare | |
2711 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
2712 | begin | |
2713 | if Present (Stat) | |
7394c8cc AC |
2714 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
2715 | N_Extended_Return_Statement) | |
fe5d3068 | 2716 | then |
ce5ba43a | 2717 | Check_SPARK_05_Restriction |
fe5d3068 YM |
2718 | ("last statement in function should be RETURN", Stat); |
2719 | end if; | |
2720 | end; | |
2721 | ||
ad05f2e9 | 2722 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
2723 | |
2724 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
2725 | if Present (Spec_Id) then |
2726 | Id := Spec_Id; | |
2727 | else | |
2728 | Id := Body_Id; | |
2729 | end if; | |
2730 | ||
8d606a78 RD |
2731 | -- Would be nice to point to return statement here, can we |
2732 | -- borrow the Check_Returns procedure here ??? | |
2733 | ||
607d0635 | 2734 | if Return_Present (Id) then |
ce5ba43a | 2735 | Check_SPARK_05_Restriction |
fe5d3068 | 2736 | ("procedure should not have RETURN", N); |
607d0635 | 2737 | end if; |
7665e4bd AC |
2738 | end if; |
2739 | end Check_Missing_Return; | |
2740 | ||
d44202ba HK |
2741 | ----------------------- |
2742 | -- Disambiguate_Spec -- | |
2743 | ----------------------- | |
2744 | ||
2745 | function Disambiguate_Spec return Entity_Id is | |
2746 | Priv_Spec : Entity_Id; | |
2747 | Spec_N : Entity_Id; | |
2748 | ||
2749 | procedure Replace_Types (To_Corresponding : Boolean); | |
2750 | -- Depending on the flag, replace the type of formal parameters of | |
2751 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2752 | -- the corresponding record type or the other way around. | |
2753 | ||
2754 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2755 | Formal : Entity_Id; | |
2756 | Formal_Typ : Entity_Id; | |
2757 | ||
2758 | begin | |
2759 | Formal := First_Formal (Body_Id); | |
2760 | while Present (Formal) loop | |
2761 | Formal_Typ := Etype (Formal); | |
2762 | ||
df3e68b1 HK |
2763 | if Is_Class_Wide_Type (Formal_Typ) then |
2764 | Formal_Typ := Root_Type (Formal_Typ); | |
2765 | end if; | |
2766 | ||
d44202ba HK |
2767 | -- From concurrent type to corresponding record |
2768 | ||
2769 | if To_Corresponding then | |
2770 | if Is_Concurrent_Type (Formal_Typ) | |
2771 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4b6f99f5 RD |
2772 | and then |
2773 | Present (Interfaces | |
2774 | (Corresponding_Record_Type (Formal_Typ))) | |
d44202ba HK |
2775 | then |
2776 | Set_Etype (Formal, | |
2777 | Corresponding_Record_Type (Formal_Typ)); | |
2778 | end if; | |
2779 | ||
2780 | -- From corresponding record to concurrent type | |
2781 | ||
2782 | else | |
2783 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2784 | and then Present (Interfaces (Formal_Typ)) | |
2785 | then | |
2786 | Set_Etype (Formal, | |
2787 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2788 | end if; | |
2789 | end if; | |
2790 | ||
2791 | Next_Formal (Formal); | |
2792 | end loop; | |
2793 | end Replace_Types; | |
2794 | ||
2795 | -- Start of processing for Disambiguate_Spec | |
2796 | ||
2797 | begin | |
2798 | -- Try to retrieve the specification of the body as is. All error | |
2799 | -- messages are suppressed because the body may not have a spec in | |
2800 | -- its current state. | |
2801 | ||
2802 | Spec_N := Find_Corresponding_Spec (N, False); | |
2803 | ||
2804 | -- It is possible that this is the body of a primitive declared | |
2805 | -- between a private and a full view of a concurrent type. The | |
2806 | -- controlling parameter of the spec carries the concurrent type, | |
2807 | -- not the corresponding record type as transformed by Analyze_ | |
2808 | -- Subprogram_Specification. In such cases, we undo the change | |
2809 | -- made by the analysis of the specification and try to find the | |
2810 | -- spec again. | |
766d7add | 2811 | |
8198b93d HK |
2812 | -- Note that wrappers already have their corresponding specs and |
2813 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2814 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2815 | -- original concurrent status. |
d44202ba | 2816 | |
8198b93d HK |
2817 | if No (Spec_N) |
2818 | or else Is_Primitive_Wrapper (Spec_N) | |
2819 | then | |
d44202ba HK |
2820 | -- Restore all references of corresponding record types to the |
2821 | -- original concurrent types. | |
2822 | ||
2823 | Replace_Types (To_Corresponding => False); | |
2824 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2825 | ||
2826 | -- The current body truly belongs to a primitive declared between | |
2827 | -- a private and a full view. We leave the modified body as is, | |
2828 | -- and return the true spec. | |
2829 | ||
2830 | if Present (Priv_Spec) | |
2831 | and then Is_Private_Primitive (Priv_Spec) | |
2832 | then | |
2833 | return Priv_Spec; | |
2834 | end if; | |
2835 | ||
2836 | -- In case that this is some sort of error, restore the original | |
2837 | -- state of the body. | |
2838 | ||
2839 | Replace_Types (To_Corresponding => True); | |
2840 | end if; | |
2841 | ||
2842 | return Spec_N; | |
2843 | end Disambiguate_Spec; | |
2844 | ||
5dcab3ca AC |
2845 | ---------------------------- |
2846 | -- Exchange_Limited_Views -- | |
2847 | ---------------------------- | |
2848 | ||
2849 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id) is | |
2850 | procedure Detect_And_Exchange (Id : Entity_Id); | |
2851 | -- Determine whether Id's type denotes an incomplete type associated | |
2852 | -- with a limited with clause and exchange the limited view with the | |
167b47d9 | 2853 | -- non-limited one when available. |
5dcab3ca AC |
2854 | |
2855 | ------------------------- | |
2856 | -- Detect_And_Exchange -- | |
2857 | ------------------------- | |
2858 | ||
2859 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
2860 | Typ : constant Entity_Id := Etype (Id); | |
5dcab3ca | 2861 | begin |
ccd6f414 | 2862 | if From_Limited_With (Typ) and then Has_Non_Limited_View (Typ) then |
5dcab3ca AC |
2863 | Set_Etype (Id, Non_Limited_View (Typ)); |
2864 | end if; | |
2865 | end Detect_And_Exchange; | |
2866 | ||
2867 | -- Local variables | |
2868 | ||
2869 | Formal : Entity_Id; | |
2870 | ||
2871 | -- Start of processing for Exchange_Limited_Views | |
2872 | ||
2873 | begin | |
2874 | if No (Subp_Id) then | |
2875 | return; | |
2876 | ||
2877 | -- Do not process subprogram bodies as they already use the non- | |
2878 | -- limited view of types. | |
2879 | ||
2880 | elsif not Ekind_In (Subp_Id, E_Function, E_Procedure) then | |
2881 | return; | |
2882 | end if; | |
2883 | ||
2884 | -- Examine all formals and swap views when applicable | |
2885 | ||
2886 | Formal := First_Formal (Subp_Id); | |
2887 | while Present (Formal) loop | |
2888 | Detect_And_Exchange (Formal); | |
2889 | ||
2890 | Next_Formal (Formal); | |
2891 | end loop; | |
2892 | ||
2893 | -- Process the return type of a function | |
2894 | ||
2895 | if Ekind (Subp_Id) = E_Function then | |
2896 | Detect_And_Exchange (Subp_Id); | |
2897 | end if; | |
2898 | end Exchange_Limited_Views; | |
2899 | ||
d44202ba HK |
2900 | ------------------------------------- |
2901 | -- Is_Private_Concurrent_Primitive -- | |
2902 | ------------------------------------- | |
2903 | ||
2904 | function Is_Private_Concurrent_Primitive | |
2905 | (Subp_Id : Entity_Id) return Boolean | |
2906 | is | |
2907 | Formal_Typ : Entity_Id; | |
2908 | ||
2909 | begin | |
2910 | if Present (First_Formal (Subp_Id)) then | |
2911 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2912 | ||
2913 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2914 | if Is_Class_Wide_Type (Formal_Typ) then |
2915 | Formal_Typ := Root_Type (Formal_Typ); | |
2916 | end if; | |
2917 | ||
d44202ba HK |
2918 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2919 | end if; | |
2920 | ||
2921 | -- The type of the first formal is a concurrent tagged type with | |
2922 | -- a private view. | |
2923 | ||
2924 | return | |
2925 | Is_Concurrent_Type (Formal_Typ) | |
2926 | and then Is_Tagged_Type (Formal_Typ) | |
2927 | and then Has_Private_Declaration (Formal_Typ); | |
2928 | end if; | |
2929 | ||
2930 | return False; | |
2931 | end Is_Private_Concurrent_Primitive; | |
2932 | ||
241ebe89 HK |
2933 | --------------------- |
2934 | -- Restore_Globals -- | |
2935 | --------------------- | |
2936 | ||
2937 | procedure Restore_Globals is | |
2938 | begin | |
2939 | Ghost_Mode := GM; | |
2940 | end Restore_Globals; | |
2941 | ||
76a69663 ES |
2942 | ---------------------------- |
2943 | -- Set_Trivial_Subprogram -- | |
2944 | ---------------------------- | |
2945 | ||
2946 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2947 | Nxt : constant Node_Id := Next (N); | |
2948 | ||
2949 | begin | |
2950 | Set_Is_Trivial_Subprogram (Body_Id); | |
2951 | ||
2952 | if Present (Spec_Id) then | |
2953 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2954 | end if; | |
2955 | ||
2956 | if Present (Nxt) | |
2957 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2958 | and then No (Next (Nxt)) | |
2959 | and then Present (Expression (Nxt)) | |
2960 | and then Is_Entity_Name (Expression (Nxt)) | |
2961 | then | |
2962 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2963 | end if; | |
2964 | end Set_Trivial_Subprogram; | |
2965 | ||
758c442c GD |
2966 | --------------------------------- |
2967 | -- Verify_Overriding_Indicator -- | |
2968 | --------------------------------- | |
2969 | ||
2970 | procedure Verify_Overriding_Indicator is | |
2971 | begin | |
21d27997 RD |
2972 | if Must_Override (Body_Spec) then |
2973 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
4b6f99f5 | 2974 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 RD |
2975 | then |
2976 | null; | |
2977 | ||
038140ed | 2978 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2979 | Error_Msg_NE |
21d27997 | 2980 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
23e28b42 AC |
2981 | |
2982 | -- Overriding indicators aren't allowed for protected subprogram | |
2983 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
2984 | -- this to a warning if -gnatd.E is enabled. | |
2985 | ||
2986 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
2987 | Error_Msg_Warn := Error_To_Warning; | |
2988 | Error_Msg_N | |
b785e0b8 | 2989 | ("<<overriding indicator not allowed for protected " |
23e28b42 | 2990 | & "subprogram body", Body_Spec); |
21d27997 | 2991 | end if; |
758c442c | 2992 | |
5d37ba92 | 2993 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2994 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2995 | Error_Msg_NE |
5d37ba92 | 2996 | ("subprogram& overrides inherited operation", |
76a69663 | 2997 | Body_Spec, Spec_Id); |
5d37ba92 | 2998 | |
21d27997 | 2999 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
4b6f99f5 | 3000 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
21d27997 | 3001 | then |
ed2233dc | 3002 | Error_Msg_NE |
3ccedacc | 3003 | ("subprogram& overrides predefined operator ", |
21d27997 RD |
3004 | Body_Spec, Spec_Id); |
3005 | ||
23e28b42 AC |
3006 | -- Overriding indicators aren't allowed for protected subprogram |
3007 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
3008 | -- this to a warning if -gnatd.E is enabled. | |
3009 | ||
3010 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
3011 | Error_Msg_Warn := Error_To_Warning; | |
5d37ba92 | 3012 | |
23e28b42 | 3013 | Error_Msg_N |
3ccedacc AC |
3014 | ("<<overriding indicator not allowed " |
3015 | & "for protected subprogram body", Body_Spec); | |
23e28b42 AC |
3016 | |
3017 | -- If this is not a primitive operation, then the overriding | |
3018 | -- indicator is altogether illegal. | |
3019 | ||
3020 | elsif not Is_Primitive (Spec_Id) then | |
ed2233dc | 3021 | Error_Msg_N |
3ccedacc AC |
3022 | ("overriding indicator only allowed " |
3023 | & "if subprogram is primitive", Body_Spec); | |
5d37ba92 | 3024 | end if; |
235f4375 | 3025 | |
23e28b42 AC |
3026 | -- If checking the style rule and the operation overrides, then |
3027 | -- issue a warning about a missing overriding_indicator. Protected | |
3028 | -- subprogram bodies are excluded from this style checking, since | |
3029 | -- they aren't primitives (even though their declarations can | |
3030 | -- override) and aren't allowed to have an overriding_indicator. | |
3031 | ||
806f6d37 | 3032 | elsif Style_Check |
038140ed | 3033 | and then Present (Overridden_Operation (Spec_Id)) |
23e28b42 | 3034 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type |
235f4375 AC |
3035 | then |
3036 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3037 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
3038 | |
3039 | elsif Style_Check | |
3040 | and then Can_Override_Operator (Spec_Id) | |
3041 | and then not Is_Predefined_File_Name | |
3042 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
3043 | then | |
3044 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
3045 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
3046 | end if; |
3047 | end Verify_Overriding_Indicator; | |
3048 | ||
b1b543d2 | 3049 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 3050 | |
996ae0b0 | 3051 | begin |
82c80734 RD |
3052 | -- Generic subprograms are handled separately. They always have a |
3053 | -- generic specification. Determine whether current scope has a | |
3054 | -- previous declaration. | |
996ae0b0 | 3055 | |
82c80734 RD |
3056 | -- If the subprogram body is defined within an instance of the same |
3057 | -- name, the instance appears as a package renaming, and will be hidden | |
3058 | -- within the subprogram. | |
996ae0b0 RK |
3059 | |
3060 | if Present (Prev_Id) | |
3061 | and then not Is_Overloadable (Prev_Id) | |
3062 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
3063 | or else Comes_From_Source (Prev_Id)) | |
3064 | then | |
fbf5a39b | 3065 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 | 3066 | Spec_Id := Prev_Id; |
8636f52f HK |
3067 | |
3068 | -- The corresponding spec may be subject to pragma Ghost with | |
3069 | -- policy Ignore. Set the mode now to ensure that any nodes | |
3070 | -- generated during analysis and expansion are properly flagged | |
3071 | -- as ignored Ghost. | |
3072 | ||
3073 | Set_Ghost_Mode (N, Spec_Id); | |
996ae0b0 RK |
3074 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); |
3075 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3076 | ||
3077 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
3078 | |
3079 | if Nkind (N) = N_Subprogram_Body then | |
3080 | HSS := Handled_Statement_Sequence (N); | |
3081 | Check_Missing_Return; | |
3082 | end if; | |
3083 | ||
241ebe89 | 3084 | Restore_Globals; |
996ae0b0 RK |
3085 | return; |
3086 | ||
3087 | else | |
82c80734 RD |
3088 | -- Previous entity conflicts with subprogram name. Attempting to |
3089 | -- enter name will post error. | |
996ae0b0 RK |
3090 | |
3091 | Enter_Name (Body_Id); | |
241ebe89 | 3092 | Restore_Globals; |
996ae0b0 RK |
3093 | return; |
3094 | end if; | |
3095 | ||
82c80734 RD |
3096 | -- Non-generic case, find the subprogram declaration, if one was seen, |
3097 | -- or enter new overloaded entity in the current scope. If the | |
3098 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
3099 | -- part of the context of one of its subunits. No need to redo the | |
3100 | -- analysis. | |
996ae0b0 | 3101 | |
8fde064e | 3102 | elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
241ebe89 | 3103 | Restore_Globals; |
996ae0b0 RK |
3104 | return; |
3105 | ||
3106 | else | |
fbf5a39b | 3107 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
3108 | |
3109 | if Nkind (N) = N_Subprogram_Body_Stub | |
3110 | or else No (Corresponding_Spec (N)) | |
3111 | then | |
d44202ba HK |
3112 | if Is_Private_Concurrent_Primitive (Body_Id) then |
3113 | Spec_Id := Disambiguate_Spec; | |
8636f52f HK |
3114 | |
3115 | -- The corresponding spec may be subject to pragma Ghost with | |
3116 | -- policy Ignore. Set the mode now to ensure that any nodes | |
3117 | -- generated during analysis and expansion are properly flagged | |
3118 | -- as ignored Ghost. | |
3119 | ||
3120 | Set_Ghost_Mode (N, Spec_Id); | |
3121 | ||
d44202ba HK |
3122 | else |
3123 | Spec_Id := Find_Corresponding_Spec (N); | |
b6c8e5be | 3124 | |
8636f52f HK |
3125 | -- The corresponding spec may be subject to pragma Ghost with |
3126 | -- policy Ignore. Set the mode now to ensure that any nodes | |
3127 | -- generated during analysis and expansion are properly flagged | |
3128 | -- as ignored Ghost. | |
3129 | ||
3130 | Set_Ghost_Mode (N, Spec_Id); | |
3131 | ||
b6c8e5be AC |
3132 | -- In GNATprove mode, if the body has no previous spec, create |
3133 | -- one so that the inlining machinery can operate properly. | |
3134 | -- Transfer aspects, if any, to the new spec, so that they | |
3135 | -- are legal and can be processed ahead of the body. | |
3136 | -- We make two copies of the given spec, one for the new | |
3137 | -- declaration, and one for the body. | |
3138 | ||
5a271a7f | 3139 | if No (Spec_Id) and then GNATprove_Mode |
480156b2 | 3140 | |
480156b2 AC |
3141 | -- Inlining does not apply during pre-analysis of code |
3142 | ||
b6c8e5be | 3143 | and then Full_Analysis |
480156b2 AC |
3144 | |
3145 | -- Inlining only applies to full bodies, not stubs | |
3146 | ||
7b2888e6 | 3147 | and then Nkind (N) /= N_Subprogram_Body_Stub |
480156b2 AC |
3148 | |
3149 | -- Inlining only applies to bodies in the source code, not to | |
3150 | -- those generated by the compiler. In particular, expression | |
3151 | -- functions, whose body is generated by the compiler, are | |
3152 | -- treated specially by GNATprove. | |
3153 | ||
b6c8e5be | 3154 | and then Comes_From_Source (Body_Id) |
480156b2 AC |
3155 | |
3156 | -- This cannot be done for a compilation unit, which is not | |
3157 | -- in a context where we can insert a new spec. | |
3158 | ||
b6c8e5be | 3159 | and then Is_List_Member (N) |
480156b2 AC |
3160 | |
3161 | -- Inlining only applies to subprograms without contracts, | |
3162 | -- as a contract is a sign that GNATprove should perform a | |
3163 | -- modular analysis of the subprogram instead of a contextual | |
3164 | -- analysis at each call site. The same test is performed in | |
3165 | -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated | |
3166 | -- here in another form (because the contract has not | |
3167 | -- been attached to the body) to avoid frontend errors in | |
3168 | -- case pragmas are used instead of aspects, because the | |
3169 | -- corresponding pragmas in the body would not be transferred | |
3170 | -- to the spec, leading to legality errors. | |
3171 | ||
ac072cb2 | 3172 | and then not Body_Has_Contract |
8d1fe980 | 3173 | and then not Inside_A_Generic |
b6c8e5be | 3174 | then |
8d1fe980 | 3175 | Build_Subprogram_Declaration; |
b6c8e5be | 3176 | end if; |
d44202ba | 3177 | end if; |
996ae0b0 RK |
3178 | |
3179 | -- If this is a duplicate body, no point in analyzing it | |
3180 | ||
3181 | if Error_Posted (N) then | |
241ebe89 | 3182 | Restore_Globals; |
996ae0b0 RK |
3183 | return; |
3184 | end if; | |
3185 | ||
82c80734 RD |
3186 | -- A subprogram body should cause freezing of its own declaration, |
3187 | -- but if there was no previous explicit declaration, then the | |
3188 | -- subprogram will get frozen too late (there may be code within | |
3189 | -- the body that depends on the subprogram having been frozen, | |
3190 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 3191 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
3192 | -- Finally, if the return type is an anonymous access to protected |
3193 | -- subprogram, it must be frozen before the body because its | |
3194 | -- expansion has generated an equivalent type that is used when | |
3195 | -- elaborating the body. | |
996ae0b0 | 3196 | |
885c4871 | 3197 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
3198 | -- created for expression functions do not freeze. |
3199 | ||
3200 | if No (Spec_Id) | |
3201 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
3202 | then | |
996ae0b0 RK |
3203 | Freeze_Before (N, Body_Id); |
3204 | ||
3205 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
3206 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
3207 | |
3208 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
3209 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 3210 | end if; |
a38ff9b1 | 3211 | |
996ae0b0 RK |
3212 | else |
3213 | Spec_Id := Corresponding_Spec (N); | |
8636f52f HK |
3214 | |
3215 | -- The corresponding spec may be subject to pragma Ghost with | |
3216 | -- policy Ignore. Set the mode now to ensure that any nodes | |
3217 | -- generated during analysis and expansion are properly flagged | |
3218 | -- as ignored Ghost. | |
3219 | ||
3220 | Set_Ghost_Mode (N, Spec_Id); | |
996ae0b0 RK |
3221 | end if; |
3222 | end if; | |
3223 | ||
799d0e05 AC |
3224 | -- Previously we scanned the body to look for nested subprograms, and |
3225 | -- rejected an inline directive if nested subprograms were present, | |
3226 | -- because the back-end would generate conflicting symbols for the | |
c8957aae | 3227 | -- nested bodies. This is now unnecessary. |
07fc65c4 | 3228 | |
c8957aae | 3229 | -- Look ahead to recognize a pragma Inline that appears after the body |
84f4072a | 3230 | |
e660dbf7 JM |
3231 | Check_Inline_Pragma (Spec_Id); |
3232 | ||
701b7fbb RD |
3233 | -- Deal with special case of a fully private operation in the body of |
3234 | -- the protected type. We must create a declaration for the subprogram, | |
3235 | -- in order to attach the protected subprogram that will be used in | |
3236 | -- internal calls. We exclude compiler generated bodies from the | |
3237 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 3238 | |
996ae0b0 RK |
3239 | if No (Spec_Id) |
3240 | and then Comes_From_Source (N) | |
3241 | and then Is_Protected_Type (Current_Scope) | |
3242 | then | |
47bfea3a | 3243 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 3244 | end if; |
996ae0b0 | 3245 | |
5334d18f | 3246 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 3247 | |
701b7fbb | 3248 | if Present (Spec_Id) then |
996ae0b0 | 3249 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 3250 | Verify_Overriding_Indicator; |
5d37ba92 ES |
3251 | |
3252 | -- In general, the spec will be frozen when we start analyzing the | |
3253 | -- body. However, for internally generated operations, such as | |
3254 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
3255 | -- results, the spec may not have been frozen by the time we expand |
3256 | -- the freeze actions that include the bodies. In particular, extra | |
3257 | -- formals for accessibility or for return-in-place may need to be | |
3258 | -- generated. Freeze nodes, if any, are inserted before the current | |
3259 | -- body. These freeze actions are also needed in ASIS mode to enable | |
3260 | -- the proper back-annotations. | |
5d37ba92 ES |
3261 | |
3262 | if not Is_Frozen (Spec_Id) | |
7134062a | 3263 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
3264 | then |
3265 | -- Force the generation of its freezing node to ensure proper | |
3266 | -- management of access types in the backend. | |
3267 | ||
3268 | -- This is definitely needed for some cases, but it is not clear | |
3269 | -- why, to be investigated further??? | |
3270 | ||
3271 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 3272 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 3273 | end if; |
996ae0b0 RK |
3274 | end if; |
3275 | ||
3276 | -- Place subprogram on scope stack, and make formals visible. If there | |
3277 | -- is a spec, the visible entity remains that of the spec. | |
3278 | ||
3279 | if Present (Spec_Id) then | |
07fc65c4 | 3280 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
3281 | |
3282 | if Is_Child_Unit (Spec_Id) then | |
3283 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
3284 | end if; | |
3285 | ||
fbf5a39b AC |
3286 | if Style_Check then |
3287 | Style.Check_Identifier (Body_Id, Spec_Id); | |
3288 | end if; | |
996ae0b0 RK |
3289 | |
3290 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
3291 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3292 | ||
f937473f | 3293 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 3294 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
241ebe89 | 3295 | Restore_Globals; |
996ae0b0 | 3296 | return; |
21d27997 | 3297 | |
996ae0b0 RK |
3298 | else |
3299 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
3300 | Set_Has_Completion (Spec_Id); | |
3301 | ||
c5cec2fe AC |
3302 | -- Inherit the "ghostness" of the subprogram spec. Note that this |
3303 | -- property is not directly inherited as the body may be subject | |
3304 | -- to a different Ghost assertion policy. | |
3305 | ||
8636f52f | 3306 | if Is_Ghost_Entity (Spec_Id) or else Ghost_Mode > None then |
c5cec2fe AC |
3307 | Set_Is_Ghost_Entity (Body_Id); |
3308 | ||
3309 | -- The Ghost policy in effect at the point of declaration and | |
c2cfccb1 | 3310 | -- at the point of completion must match (SPARK RM 6.9(14)). |
c5cec2fe AC |
3311 | |
3312 | Check_Ghost_Completion (Spec_Id, Body_Id); | |
3313 | end if; | |
3314 | ||
996ae0b0 | 3315 | if Is_Protected_Type (Scope (Spec_Id)) then |
21d27997 | 3316 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
3317 | end if; |
3318 | ||
3319 | -- If this is a body generated for a renaming, do not check for | |
3320 | -- full conformance. The check is redundant, because the spec of | |
3321 | -- the body is a copy of the spec in the renaming declaration, | |
3322 | -- and the test can lead to spurious errors on nested defaults. | |
3323 | ||
3324 | if Present (Spec_Decl) | |
996ae0b0 | 3325 | and then not Comes_From_Source (N) |
93a81b02 GB |
3326 | and then |
3327 | (Nkind (Original_Node (Spec_Decl)) = | |
4b6f99f5 | 3328 | N_Subprogram_Renaming_Declaration |
466c2127 AC |
3329 | or else (Present (Corresponding_Body (Spec_Decl)) |
3330 | and then | |
3331 | Nkind (Unit_Declaration_Node | |
3332 | (Corresponding_Body (Spec_Decl))) = | |
3333 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
3334 | then |
3335 | Conformant := True; | |
cabe9abc AC |
3336 | |
3337 | -- Conversely, the spec may have been generated for specless body | |
3338 | -- with an inline pragma. | |
3339 | ||
3340 | elsif Comes_From_Source (N) | |
3341 | and then not Comes_From_Source (Spec_Id) | |
3342 | and then Has_Pragma_Inline (Spec_Id) | |
3343 | then | |
3344 | Conformant := True; | |
76a69663 | 3345 | |
996ae0b0 RK |
3346 | else |
3347 | Check_Conformance | |
3348 | (Body_Id, Spec_Id, | |
76a69663 | 3349 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
3350 | end if; |
3351 | ||
3352 | -- If the body is not fully conformant, we have to decide if we | |
3353 | -- should analyze it or not. If it has a really messed up profile | |
3354 | -- then we probably should not analyze it, since we will get too | |
3355 | -- many bogus messages. | |
3356 | ||
3357 | -- Our decision is to go ahead in the non-fully conformant case | |
3358 | -- only if it is at least mode conformant with the spec. Note | |
3359 | -- that the call to Check_Fully_Conformant has issued the proper | |
3360 | -- error messages to complain about the lack of conformance. | |
3361 | ||
3362 | if not Conformant | |
3363 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
3364 | then | |
241ebe89 | 3365 | Restore_Globals; |
996ae0b0 RK |
3366 | return; |
3367 | end if; | |
3368 | end if; | |
3369 | ||
996ae0b0 | 3370 | if Spec_Id /= Body_Id then |
fbf5a39b | 3371 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
3372 | end if; |
3373 | ||
579847c2 AC |
3374 | Set_Ekind (Body_Id, E_Subprogram_Body); |
3375 | ||
e28072cd AC |
3376 | if Nkind (N) = N_Subprogram_Body_Stub then |
3377 | Set_Corresponding_Spec_Of_Stub (N, Spec_Id); | |
3378 | ||
3379 | -- Regular body | |
3380 | ||
3381 | else | |
996ae0b0 | 3382 | Set_Corresponding_Spec (N, Spec_Id); |
758c442c | 3383 | |
5d37ba92 ES |
3384 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
3385 | -- of a concurrent type, the type of the first parameter has been | |
3386 | -- replaced with the corresponding record, which is the proper | |
3387 | -- run-time structure to use. However, within the body there may | |
3388 | -- be uses of the formals that depend on primitive operations | |
3389 | -- of the type (in particular calls in prefixed form) for which | |
3390 | -- we need the original concurrent type. The operation may have | |
3391 | -- several controlling formals, so the replacement must be done | |
3392 | -- for all of them. | |
758c442c GD |
3393 | |
3394 | if Comes_From_Source (Spec_Id) | |
3395 | and then Present (First_Entity (Spec_Id)) | |
3396 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
3397 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
15918371 AC |
3398 | and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
3399 | and then Present (Corresponding_Concurrent_Type | |
3400 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 3401 | then |
5d37ba92 ES |
3402 | declare |
3403 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
3404 | Form : Entity_Id; | |
3405 | ||
3406 | begin | |
3407 | Form := First_Formal (Spec_Id); | |
3408 | while Present (Form) loop | |
3409 | if Etype (Form) = Typ then | |
3410 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
3411 | end if; | |
3412 | ||
3413 | Next_Formal (Form); | |
3414 | end loop; | |
3415 | end; | |
758c442c GD |
3416 | end if; |
3417 | ||
21d27997 RD |
3418 | -- Make the formals visible, and place subprogram on scope stack. |
3419 | -- This is also the point at which we set Last_Real_Spec_Entity | |
3420 | -- to mark the entities which will not be moved to the body. | |
758c442c | 3421 | |
996ae0b0 | 3422 | Install_Formals (Spec_Id); |
21d27997 | 3423 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
616547fa AC |
3424 | |
3425 | -- Within an instance, add local renaming declarations so that | |
a5a809b2 AC |
3426 | -- gdb can retrieve the values of actuals more easily. This is |
3427 | -- only relevant if generating code (and indeed we definitely | |
3428 | -- do not want these definitions -gnatc mode, because that would | |
3429 | -- confuse ASIS). | |
616547fa AC |
3430 | |
3431 | if Is_Generic_Instance (Spec_Id) | |
3432 | and then Is_Wrapper_Package (Current_Scope) | |
a5a809b2 | 3433 | and then Expander_Active |
616547fa AC |
3434 | then |
3435 | Build_Subprogram_Instance_Renamings (N, Current_Scope); | |
3436 | end if; | |
3437 | ||
0a36105d | 3438 | Push_Scope (Spec_Id); |
996ae0b0 RK |
3439 | |
3440 | -- Make sure that the subprogram is immediately visible. For | |
3441 | -- child units that have no separate spec this is indispensable. | |
3442 | -- Otherwise it is safe albeit redundant. | |
3443 | ||
3444 | Set_Is_Immediately_Visible (Spec_Id); | |
3445 | end if; | |
3446 | ||
3447 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
ec4867fa | 3448 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
c9d70ab1 | 3449 | Set_Scope (Body_Id, Scope (Spec_Id)); |
996ae0b0 RK |
3450 | |
3451 | -- Case of subprogram body with no previous spec | |
3452 | ||
3453 | else | |
3e5daac4 AC |
3454 | -- Check for style warning required |
3455 | ||
996ae0b0 | 3456 | if Style_Check |
3e5daac4 AC |
3457 | |
3458 | -- Only apply check for source level subprograms for which checks | |
3459 | -- have not been suppressed. | |
3460 | ||
996ae0b0 RK |
3461 | and then Comes_From_Source (Body_Id) |
3462 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
3463 | |
3464 | -- No warnings within an instance | |
3465 | ||
996ae0b0 | 3466 | and then not In_Instance |
3e5daac4 | 3467 | |
b0186f71 | 3468 | -- No warnings for expression functions |
3e5daac4 | 3469 | |
b0186f71 | 3470 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
3471 | then |
3472 | Style.Body_With_No_Spec (N); | |
3473 | end if; | |
3474 | ||
3475 | New_Overloaded_Entity (Body_Id); | |
3476 | ||
3477 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
3478 | Set_Acts_As_Spec (N); | |
3479 | Generate_Definition (Body_Id); | |
fbf5a39b AC |
3480 | Generate_Reference |
3481 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 3482 | Install_Formals (Body_Id); |
e949ee22 | 3483 | |
4a854847 | 3484 | Push_Scope (Body_Id); |
996ae0b0 | 3485 | end if; |
dbe36d67 AC |
3486 | |
3487 | -- For stubs and bodies with no previous spec, generate references to | |
3488 | -- formals. | |
3489 | ||
3490 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
3491 | end if; |
3492 | ||
5216b599 AC |
3493 | -- Set SPARK_Mode from context |
3494 | ||
3495 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); | |
3496 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
3497 | ||
76a69663 ES |
3498 | -- If the return type is an anonymous access type whose designated type |
3499 | -- is the limited view of a class-wide type and the non-limited view is | |
3500 | -- available, update the return type accordingly. | |
ec4867fa | 3501 | |
8fde064e | 3502 | if Ada_Version >= Ada_2005 and then Comes_From_Source (N) then |
ec4867fa | 3503 | declare |
ec4867fa | 3504 | Etyp : Entity_Id; |
0a36105d | 3505 | Rtyp : Entity_Id; |
ec4867fa ES |
3506 | |
3507 | begin | |
0a36105d JM |
3508 | Rtyp := Etype (Current_Scope); |
3509 | ||
3510 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
3511 | Etyp := Directly_Designated_Type (Rtyp); | |
3512 | ||
7b56a91b AC |
3513 | if Is_Class_Wide_Type (Etyp) |
3514 | and then From_Limited_With (Etyp) | |
3515 | then | |
0a36105d JM |
3516 | Set_Directly_Designated_Type |
3517 | (Etype (Current_Scope), Available_View (Etyp)); | |
3518 | end if; | |
3519 | end if; | |
ec4867fa ES |
3520 | end; |
3521 | end if; | |
3522 | ||
996ae0b0 RK |
3523 | -- If this is the proper body of a stub, we must verify that the stub |
3524 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 3525 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
3526 | -- only required for subprograms that come from source. |
3527 | ||
3528 | if Nkind (Parent (N)) = N_Subunit | |
3529 | and then Comes_From_Source (N) | |
3530 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
3531 | and then Nkind (Corresponding_Stub (Parent (N))) = |
3532 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
3533 | then |
3534 | declare | |
fbf5a39b AC |
3535 | Old_Id : constant Entity_Id := |
3536 | Defining_Entity | |
3537 | (Specification (Corresponding_Stub (Parent (N)))); | |
3538 | ||
996ae0b0 | 3539 | Conformant : Boolean := False; |
996ae0b0 RK |
3540 | |
3541 | begin | |
3542 | if No (Spec_Id) then | |
3543 | Check_Fully_Conformant (Body_Id, Old_Id); | |
3544 | ||
3545 | else | |
3546 | Check_Conformance | |
3547 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
3548 | ||
3549 | if not Conformant then | |
3550 | ||
dbe36d67 AC |
3551 | -- The stub was taken to be a new declaration. Indicate that |
3552 | -- it lacks a body. | |
996ae0b0 RK |
3553 | |
3554 | Set_Has_Completion (Old_Id, False); | |
3555 | end if; | |
3556 | end if; | |
3557 | end; | |
3558 | end if; | |
3559 | ||
3560 | Set_Has_Completion (Body_Id); | |
3561 | Check_Eliminated (Body_Id); | |
3562 | ||
caf07df9 AC |
3563 | -- Analyze any aspect specifications that appear on the subprogram body |
3564 | -- stub. Stop the analysis now as the stub does not have a declarative | |
3565 | -- or a statement part, and it cannot be inlined. | |
c8a3028c | 3566 | |
caf07df9 | 3567 | if Nkind (N) = N_Subprogram_Body_Stub then |
c8a3028c | 3568 | if Has_Aspects (N) then |
caf07df9 | 3569 | Analyze_Aspect_Specifications_On_Body_Or_Stub (N); |
c8a3028c AC |
3570 | end if; |
3571 | ||
241ebe89 | 3572 | Restore_Globals; |
996ae0b0 | 3573 | return; |
84f4072a | 3574 | end if; |
996ae0b0 | 3575 | |
b94b6c56 | 3576 | -- Handle frontend inlining |
84f4072a | 3577 | |
b94b6c56 RD |
3578 | -- Note: Normally we don't do any inlining if expansion is off, since |
3579 | -- we won't generate code in any case. An exception arises in GNATprove | |
2d180af1 YM |
3580 | -- mode where we want to expand some calls in place, even with expansion |
3581 | -- disabled, since the inlining eases formal verification. | |
ecad37f3 | 3582 | |
6c26bac2 AC |
3583 | if not GNATprove_Mode |
3584 | and then Expander_Active | |
3585 | and then Serious_Errors_Detected = 0 | |
3586 | and then Present (Spec_Id) | |
3587 | and then Has_Pragma_Inline (Spec_Id) | |
3588 | then | |
3589 | -- Legacy implementation (relying on frontend inlining) | |
84f4072a | 3590 | |
6c26bac2 | 3591 | if not Back_End_Inlining then |
17ce1f52 AC |
3592 | if (Has_Pragma_Inline_Always (Spec_Id) |
3593 | and then not Opt.Disable_FE_Inline_Always) | |
3594 | or else | |
3595 | (Has_Pragma_Inline (Spec_Id) and then Front_End_Inlining | |
3596 | and then not Opt.Disable_FE_Inline) | |
6c26bac2 AC |
3597 | then |
3598 | Build_Body_To_Inline (N, Spec_Id); | |
3599 | end if; | |
f087ea44 | 3600 | |
88f7d2d1 | 3601 | -- New implementation (relying on backend inlining) |
f087ea44 | 3602 | |
6c26bac2 AC |
3603 | else |
3604 | if Has_Pragma_Inline_Always (Spec_Id) | |
3605 | or else Optimization_Level > 0 | |
3606 | then | |
3607 | -- Handle function returning an unconstrained type | |
f087ea44 | 3608 | |
6c26bac2 AC |
3609 | if Comes_From_Source (Body_Id) |
3610 | and then Ekind (Spec_Id) = E_Function | |
3611 | and then Returns_Unconstrained_Type (Spec_Id) | |
5c5e108f AC |
3612 | |
3613 | -- If function builds in place, i.e. returns a limited type, | |
3614 | -- inlining cannot be done. | |
3615 | ||
3616 | and then not Is_Limited_Type (Etype (Spec_Id)) | |
6c26bac2 | 3617 | then |
16b10ccc | 3618 | Check_And_Split_Unconstrained_Function (N, Spec_Id, Body_Id); |
84f4072a | 3619 | |
6c26bac2 AC |
3620 | else |
3621 | declare | |
b80a2b4b AC |
3622 | Subp_Body : constant Node_Id := |
3623 | Unit_Declaration_Node (Body_Id); | |
6c26bac2 | 3624 | Subp_Decl : constant List_Id := Declarations (Subp_Body); |
84f4072a | 3625 | |
6c26bac2 AC |
3626 | begin |
3627 | -- Do not pass inlining to the backend if the subprogram | |
3628 | -- has declarations or statements which cannot be inlined | |
3629 | -- by the backend. This check is done here to emit an | |
3630 | -- error instead of the generic warning message reported | |
3631 | -- by the GCC backend (ie. "function might not be | |
3632 | -- inlinable"). | |
3633 | ||
3634 | if Present (Subp_Decl) | |
3635 | and then Has_Excluded_Declaration (Spec_Id, Subp_Decl) | |
3636 | then | |
3637 | null; | |
3638 | ||
3639 | elsif Has_Excluded_Statement | |
3640 | (Spec_Id, | |
3641 | Statements | |
3642 | (Handled_Statement_Sequence (Subp_Body))) | |
3643 | then | |
3644 | null; | |
3645 | ||
3646 | -- If the backend inlining is available then at this | |
3647 | -- stage we only have to mark the subprogram as inlined. | |
3648 | -- The expander will take care of registering it in the | |
3649 | -- table of subprograms inlined by the backend a part of | |
3650 | -- processing calls to it (cf. Expand_Call) | |
3651 | ||
3652 | else | |
3653 | Set_Is_Inlined (Spec_Id); | |
3654 | end if; | |
3655 | end; | |
3656 | end if; | |
3657 | end if; | |
3658 | end if; | |
2d180af1 YM |
3659 | |
3660 | -- In GNATprove mode, inline only when there is a separate subprogram | |
3661 | -- declaration for now, as inlining of subprogram bodies acting as | |
3662 | -- declarations, or subprogram stubs, are not supported by frontend | |
3663 | -- inlining. This inlining should occur after analysis of the body, so | |
3664 | -- that it is known whether the value of SPARK_Mode applicable to the | |
3665 | -- body, which can be defined by a pragma inside the body. | |
3666 | ||
3667 | elsif GNATprove_Mode | |
2d180af1 YM |
3668 | and then Full_Analysis |
3669 | and then not Inside_A_Generic | |
3670 | and then Present (Spec_Id) | |
7c4d86c9 AC |
3671 | and then |
3672 | Nkind (Unit_Declaration_Node (Spec_Id)) = N_Subprogram_Declaration | |
2d180af1 | 3673 | and then Can_Be_Inlined_In_GNATprove_Mode (Spec_Id, Body_Id) |
ac072cb2 | 3674 | and then not Body_Has_Contract |
2d180af1 | 3675 | then |
6c26bac2 | 3676 | Build_Body_To_Inline (N, Spec_Id); |
996ae0b0 RK |
3677 | end if; |
3678 | ||
0ab80019 | 3679 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 3680 | -- of the specification we have to install the private withed units. |
21d27997 | 3681 | -- This holds for child units as well. |
9bc856dd AC |
3682 | |
3683 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 3684 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
3685 | then |
3686 | Install_Private_With_Clauses (Body_Id); | |
3687 | end if; | |
3688 | ||
ec4867fa ES |
3689 | Check_Anonymous_Return; |
3690 | ||
fdce4bb7 JM |
3691 | -- Set the Protected_Formal field of each extra formal of the protected |
3692 | -- subprogram to reference the corresponding extra formal of the | |
3693 | -- subprogram that implements it. For regular formals this occurs when | |
3694 | -- the protected subprogram's declaration is expanded, but the extra | |
3695 | -- formals don't get created until the subprogram is frozen. We need to | |
3696 | -- do this before analyzing the protected subprogram's body so that any | |
3697 | -- references to the original subprogram's extra formals will be changed | |
3698 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
3699 | ||
3700 | if Present (Spec_Id) | |
3701 | and then Is_Protected_Type (Scope (Spec_Id)) | |
3702 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
3703 | then | |
3704 | declare | |
3705 | Impl_Subp : constant Entity_Id := | |
3706 | Protected_Body_Subprogram (Spec_Id); | |
3707 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
3708 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
3709 | begin |
3710 | while Present (Prot_Ext_Formal) loop | |
3711 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 3712 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
3713 | Next_Formal_With_Extras (Prot_Ext_Formal); |
3714 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
3715 | end loop; | |
3716 | end; | |
3717 | end if; | |
3718 | ||
0868e09c | 3719 | -- Now we can go on to analyze the body |
996ae0b0 RK |
3720 | |
3721 | HSS := Handled_Statement_Sequence (N); | |
3722 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 3723 | |
f3d0f304 | 3724 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
3725 | -- for discriminals and privals and finally a declaration for the entry |
3726 | -- family index (if applicable). This form of early expansion is done | |
3727 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 | 3728 | -- references entities which were created during regular expansion. The |
3b8056a5 AC |
3729 | -- subprogram entity must come from source, and not be an internally |
3730 | -- generated subprogram. | |
21d27997 | 3731 | |
4460a9bc | 3732 | if Expander_Active |
21d27997 RD |
3733 | and then Present (Prot_Typ) |
3734 | and then Present (Spec_Id) | |
3b8056a5 | 3735 | and then Comes_From_Source (Spec_Id) |
21d27997 RD |
3736 | and then not Is_Eliminated (Spec_Id) |
3737 | then | |
3738 | Install_Private_Data_Declarations | |
3739 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
3740 | end if; | |
3741 | ||
5dcab3ca AC |
3742 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
3743 | -- may now appear in parameter and result profiles. Since the analysis | |
3744 | -- of a subprogram body may use the parameter and result profile of the | |
3745 | -- spec, swap any limited views with their non-limited counterpart. | |
3746 | ||
3747 | if Ada_Version >= Ada_2012 then | |
3748 | Exchange_Limited_Views (Spec_Id); | |
3749 | end if; | |
3750 | ||
c8a3028c AC |
3751 | -- Analyze any aspect specifications that appear on the subprogram body |
3752 | ||
3753 | if Has_Aspects (N) then | |
caf07df9 | 3754 | Analyze_Aspect_Specifications_On_Body_Or_Stub (N); |
c8a3028c AC |
3755 | end if; |
3756 | ||
996ae0b0 | 3757 | Analyze_Declarations (Declarations (N)); |
21d27997 | 3758 | |
f3124d8f | 3759 | -- Verify that the SPARK_Mode of the body agrees with that of its spec |
f90d14ac | 3760 | |
f1c7be38 | 3761 | if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then |
f90d14ac AC |
3762 | if Present (SPARK_Pragma (Spec_Id)) then |
3763 | if Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Spec_Id)) = Off | |
3764 | and then | |
3765 | Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Body_Id)) = On | |
3766 | then | |
3767 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3768 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3769 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); | |
3770 | Error_Msg_NE | |
f3124d8f | 3771 | ("\value Off was set for SPARK_Mode on & #", N, Spec_Id); |
f90d14ac AC |
3772 | end if; |
3773 | ||
3774 | elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then | |
3775 | null; | |
3776 | ||
3777 | else | |
3778 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3ccedacc | 3779 | Error_Msg_N ("incorrect application of SPARK_Mode #", N); |
f90d14ac | 3780 | Error_Msg_Sloc := Sloc (Spec_Id); |
f3124d8f HK |
3781 | Error_Msg_NE |
3782 | ("\no value was set for SPARK_Mode on & #", N, Spec_Id); | |
f90d14ac AC |
3783 | end if; |
3784 | end if; | |
3785 | ||
c9d70ab1 AC |
3786 | -- When a subprogram body appears inside a package, its contract is |
3787 | -- analyzed at the end of the package body declarations. This is due | |
3788 | -- to the delay with respect of the package contract upon which the | |
3789 | -- body contract may depend. When the subprogram body is stand alone | |
3790 | -- and acts as a compilation unit, this delay is not necessary. | |
3791 | ||
3792 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
3793 | Analyze_Subprogram_Body_Contract (Body_Id); | |
3794 | end if; | |
3795 | ||
3796 | -- Deal with preconditions, [refined] postconditions, Contract_Cases, | |
3797 | -- invariants and predicates associated with body and its spec. Since | |
3798 | -- there is no routine Expand_Declarations which would otherwise deal | |
3799 | -- with the contract expansion, generate all necessary mechanisms to | |
3800 | -- verify the contract assertions now. | |
3801 | ||
3802 | Expand_Subprogram_Contract (N); | |
3803 | ||
ac43e11e AC |
3804 | -- If SPARK_Mode for body is not On, disable frontend inlining for this |
3805 | -- subprogram in GNATprove mode, as its body should not be analyzed. | |
3806 | ||
3807 | if SPARK_Mode /= On | |
3808 | and then GNATprove_Mode | |
ac43e11e AC |
3809 | and then Present (Spec_Id) |
3810 | and then Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Declaration | |
3811 | then | |
3812 | Set_Body_To_Inline (Parent (Parent (Spec_Id)), Empty); | |
4bd4bb7f | 3813 | Set_Is_Inlined_Always (Spec_Id, False); |
ac43e11e AC |
3814 | end if; |
3815 | ||
21d27997 RD |
3816 | -- Check completion, and analyze the statements |
3817 | ||
996ae0b0 | 3818 | Check_Completion; |
33931112 | 3819 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 3820 | Analyze (HSS); |
21d27997 RD |
3821 | |
3822 | -- Deal with end of scope processing for the body | |
3823 | ||
07fc65c4 | 3824 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
3825 | End_Scope; |
3826 | Check_Subprogram_Order (N); | |
c37bb106 | 3827 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
3828 | |
3829 | -- If we have a separate spec, then the analysis of the declarations | |
3830 | -- caused the entities in the body to be chained to the spec id, but | |
3831 | -- we want them chained to the body id. Only the formal parameters | |
3832 | -- end up chained to the spec id in this case. | |
3833 | ||
3834 | if Present (Spec_Id) then | |
3835 | ||
d39d6bb8 | 3836 | -- We must conform to the categorization of our spec |
996ae0b0 | 3837 | |
d39d6bb8 | 3838 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 3839 | |
d39d6bb8 RD |
3840 | -- And if this is a child unit, the parent units must conform |
3841 | ||
3842 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
3843 | Validate_Categorization_Dependency |
3844 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
3845 | end if; | |
3846 | ||
21d27997 RD |
3847 | -- Here is where we move entities from the spec to the body |
3848 | ||
3849 | -- Case where there are entities that stay with the spec | |
3850 | ||
3851 | if Present (Last_Real_Spec_Entity) then | |
3852 | ||
dbe36d67 AC |
3853 | -- No body entities (happens when the only real spec entities come |
3854 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
3855 | |
3856 | if No (Last_Entity (Body_Id)) then | |
7c4d86c9 | 3857 | Set_First_Entity (Body_Id, Next_Entity (Last_Real_Spec_Entity)); |
21d27997 RD |
3858 | |
3859 | -- Body entities present (formals), so chain stuff past them | |
3860 | ||
3861 | else | |
3862 | Set_Next_Entity | |
3863 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
3864 | end if; | |
3865 | ||
3866 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 3867 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
3868 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
3869 | ||
dbe36d67 AC |
3870 | -- Case where there are no spec entities, in this case there can be |
3871 | -- no body entities either, so just move everything. | |
996ae0b0 | 3872 | |
a921e83c AC |
3873 | -- If the body is generated for an expression function, it may have |
3874 | -- been preanalyzed already, if 'access was applied to it. | |
3875 | ||
996ae0b0 | 3876 | else |
a921e83c AC |
3877 | if Nkind (Original_Node (Unit_Declaration_Node (Spec_Id))) /= |
3878 | N_Expression_Function | |
3879 | then | |
3880 | pragma Assert (No (Last_Entity (Body_Id))); | |
3881 | null; | |
3882 | end if; | |
3883 | ||
996ae0b0 RK |
3884 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
3885 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
3886 | Set_First_Entity (Spec_Id, Empty); | |
3887 | Set_Last_Entity (Spec_Id, Empty); | |
3888 | end if; | |
3889 | end if; | |
3890 | ||
7665e4bd | 3891 | Check_Missing_Return; |
996ae0b0 | 3892 | |
82c80734 | 3893 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
3894 | -- the body of the procedure. But first we deal with a special case |
3895 | -- where we want to modify this check. If the body of the subprogram | |
3896 | -- starts with a raise statement or its equivalent, or if the body | |
cf3e6845 AC |
3897 | -- consists entirely of a null statement, then it is pretty obvious that |
3898 | -- it is OK to not reference the parameters. For example, this might be | |
3899 | -- the following common idiom for a stubbed function: statement of the | |
3900 | -- procedure raises an exception. In particular this deals with the | |
3901 | -- common idiom of a stubbed function, which appears something like: | |
fbf5a39b AC |
3902 | |
3903 | -- function F (A : Integer) return Some_Type; | |
3904 | -- X : Some_Type; | |
3905 | -- begin | |
3906 | -- raise Program_Error; | |
3907 | -- return X; | |
3908 | -- end F; | |
3909 | ||
76a69663 ES |
3910 | -- Here the purpose of X is simply to satisfy the annoying requirement |
3911 | -- in Ada that there be at least one return, and we certainly do not | |
a90bd866 | 3912 | -- want to go posting warnings on X that it is not initialized. On |
76a69663 ES |
3913 | -- the other hand, if X is entirely unreferenced that should still |
3914 | -- get a warning. | |
3915 | ||
3916 | -- What we do is to detect these cases, and if we find them, flag the | |
3917 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
3918 | -- suppress unwanted warnings. For the case of the function stub above | |
3919 | -- we have a special test to set X as apparently assigned to suppress | |
3920 | -- the warning. | |
996ae0b0 RK |
3921 | |
3922 | declare | |
800621e0 | 3923 | Stm : Node_Id; |
996ae0b0 RK |
3924 | |
3925 | begin | |
0a36105d JM |
3926 | -- Skip initial labels (for one thing this occurs when we are in |
3927 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
3928 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 3929 | |
800621e0 | 3930 | Stm := First (Statements (HSS)); |
0a36105d JM |
3931 | while Nkind (Stm) = N_Label |
3932 | or else Nkind (Stm) in N_Push_xxx_Label | |
3933 | loop | |
996ae0b0 | 3934 | Next (Stm); |
0a36105d | 3935 | end loop; |
996ae0b0 | 3936 | |
fbf5a39b AC |
3937 | -- Do the test on the original statement before expansion |
3938 | ||
3939 | declare | |
3940 | Ostm : constant Node_Id := Original_Node (Stm); | |
3941 | ||
3942 | begin | |
76a69663 | 3943 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
3944 | |
3945 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
3946 | Set_Trivial_Subprogram (Stm); |
3947 | ||
f3d57416 | 3948 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
3949 | |
3950 | elsif Nkind (Stm) = N_Null_Statement | |
3951 | and then Comes_From_Source (Stm) | |
3952 | and then No (Next (Stm)) | |
3953 | then | |
3954 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
3955 | |
3956 | -- Check for explicit call cases which likely raise an exception | |
3957 | ||
3958 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
3959 | if Is_Entity_Name (Name (Ostm)) then | |
3960 | declare | |
3961 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
3962 | ||
3963 | begin | |
3964 | -- If the procedure is marked No_Return, then likely it | |
3965 | -- raises an exception, but in any case it is not coming | |
76a69663 | 3966 | -- back here, so turn on the flag. |
fbf5a39b | 3967 | |
f46faa08 AC |
3968 | if Present (Ent) |
3969 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
3970 | and then No_Return (Ent) |
3971 | then | |
76a69663 | 3972 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
3973 | end if; |
3974 | end; | |
3975 | end if; | |
3976 | end if; | |
3977 | end; | |
996ae0b0 RK |
3978 | end; |
3979 | ||
3980 | -- Check for variables that are never modified | |
3981 | ||
3982 | declare | |
3983 | E1, E2 : Entity_Id; | |
3984 | ||
3985 | begin | |
fbf5a39b | 3986 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
3987 | -- flags from out parameters to the corresponding entities in the |
3988 | -- body. The reason we do that is we want to post error flags on | |
3989 | -- the body entities, not the spec entities. | |
3990 | ||
3991 | if Present (Spec_Id) then | |
3992 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
3993 | while Present (E1) loop |
3994 | if Ekind (E1) = E_Out_Parameter then | |
3995 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 3996 | while Present (E2) loop |
996ae0b0 RK |
3997 | exit when Chars (E1) = Chars (E2); |
3998 | Next_Entity (E2); | |
3999 | end loop; | |
4000 | ||
fbf5a39b AC |
4001 | if Present (E2) then |
4002 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
4003 | end if; | |
996ae0b0 RK |
4004 | end if; |
4005 | ||
4006 | Next_Entity (E1); | |
4007 | end loop; | |
4008 | end if; | |
4009 | ||
2aca76d6 | 4010 | -- Check references in body |
0868e09c | 4011 | |
2aca76d6 | 4012 | Check_References (Body_Id); |
996ae0b0 | 4013 | end; |
5a271a7f RD |
4014 | |
4015 | -- Check for nested subprogram, and mark outer level subprogram if so | |
4016 | ||
4017 | declare | |
4018 | Ent : Entity_Id; | |
4019 | ||
4020 | begin | |
4021 | if Present (Spec_Id) then | |
4022 | Ent := Spec_Id; | |
4023 | else | |
4024 | Ent := Body_Id; | |
4025 | end if; | |
4026 | ||
4027 | loop | |
4028 | Ent := Enclosing_Subprogram (Ent); | |
4029 | exit when No (Ent) or else Is_Subprogram (Ent); | |
4030 | end loop; | |
4031 | ||
4032 | if Present (Ent) then | |
4033 | Set_Has_Nested_Subprogram (Ent); | |
4034 | end if; | |
4035 | end; | |
241ebe89 HK |
4036 | |
4037 | Restore_Globals; | |
b1b543d2 | 4038 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 | 4039 | |
5afe5d2d HK |
4040 | --------------------------------- |
4041 | -- Analyze_Subprogram_Contract -- | |
4042 | --------------------------------- | |
4043 | ||
c9d70ab1 | 4044 | procedure Analyze_Subprogram_Contract (Subp_Id : Entity_Id) is |
caf07df9 AC |
4045 | Items : constant Node_Id := Contract (Subp_Id); |
4046 | Depends : Node_Id := Empty; | |
4047 | Global : Node_Id := Empty; | |
4048 | Mode : SPARK_Mode_Type; | |
4049 | Prag : Node_Id; | |
4050 | Prag_Nam : Name_Id; | |
5afe5d2d HK |
4051 | |
4052 | begin | |
fc999c5d RD |
4053 | -- Due to the timing of contract analysis, delayed pragmas may be |
4054 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
4055 | -- context. To remedy this, restore the original SPARK_Mode of the | |
4056 | -- related subprogram body. | |
4057 | ||
c9d70ab1 AC |
4058 | Save_SPARK_Mode_And_Set (Subp_Id, Mode); |
4059 | ||
caf07df9 AC |
4060 | -- All subprograms carry a contract, but for some it is not significant |
4061 | -- and should not be processed. | |
c9d70ab1 | 4062 | |
caf07df9 AC |
4063 | if not Has_Significant_Contract (Subp_Id) then |
4064 | null; | |
c61ef416 | 4065 | |
caf07df9 | 4066 | elsif Present (Items) then |
5afe5d2d HK |
4067 | |
4068 | -- Analyze pre- and postconditions | |
4069 | ||
4070 | Prag := Pre_Post_Conditions (Items); | |
4071 | while Present (Prag) loop | |
c9d70ab1 | 4072 | Analyze_Pre_Post_Condition_In_Decl_Part (Prag); |
5afe5d2d HK |
4073 | Prag := Next_Pragma (Prag); |
4074 | end loop; | |
4075 | ||
4076 | -- Analyze contract-cases and test-cases | |
4077 | ||
4078 | Prag := Contract_Test_Cases (Items); | |
4079 | while Present (Prag) loop | |
c9d70ab1 | 4080 | Prag_Nam := Pragma_Name (Prag); |
ea3c0651 | 4081 | |
c9d70ab1 | 4082 | if Prag_Nam = Name_Contract_Cases then |
5afe5d2d | 4083 | Analyze_Contract_Cases_In_Decl_Part (Prag); |
5afe5d2d | 4084 | else |
c9d70ab1 AC |
4085 | pragma Assert (Prag_Nam = Name_Test_Case); |
4086 | Analyze_Test_Case_In_Decl_Part (Prag); | |
5afe5d2d HK |
4087 | end if; |
4088 | ||
4089 | Prag := Next_Pragma (Prag); | |
4090 | end loop; | |
4091 | ||
4092 | -- Analyze classification pragmas | |
4093 | ||
6c3c671e | 4094 | Prag := Classifications (Items); |
5afe5d2d | 4095 | while Present (Prag) loop |
c9d70ab1 | 4096 | Prag_Nam := Pragma_Name (Prag); |
ea3c0651 | 4097 | |
c9d70ab1 | 4098 | if Prag_Nam = Name_Depends then |
54e28df2 | 4099 | Depends := Prag; |
039538bc | 4100 | |
c9d70ab1 | 4101 | elsif Prag_Nam = Name_Global then |
54e28df2 | 4102 | Global := Prag; |
039538bc AC |
4103 | |
4104 | -- Note that pragma Extensions_Visible has already been analyzed | |
4105 | ||
5afe5d2d HK |
4106 | end if; |
4107 | ||
4108 | Prag := Next_Pragma (Prag); | |
4109 | end loop; | |
54e28df2 HK |
4110 | |
4111 | -- Analyze Global first as Depends may mention items classified in | |
4112 | -- the global categorization. | |
4113 | ||
4114 | if Present (Global) then | |
4115 | Analyze_Global_In_Decl_Part (Global); | |
4116 | end if; | |
4117 | ||
4118 | -- Depends must be analyzed after Global in order to see the modes of | |
4119 | -- all global items. | |
4120 | ||
4121 | if Present (Depends) then | |
4122 | Analyze_Depends_In_Decl_Part (Depends); | |
4123 | end if; | |
5afe5d2d | 4124 | |
c9d70ab1 AC |
4125 | -- Ensure that the contract cases or postconditions mention 'Result |
4126 | -- or define a post-state. | |
5afe5d2d | 4127 | |
c9d70ab1 AC |
4128 | Check_Result_And_Post_State (Subp_Id); |
4129 | end if; | |
5afe5d2d | 4130 | |
fc999c5d RD |
4131 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
4132 | -- pragmas have been analyzed. | |
4133 | ||
c61ef416 | 4134 | Restore_SPARK_Mode (Mode); |
5afe5d2d HK |
4135 | end Analyze_Subprogram_Contract; |
4136 | ||
996ae0b0 RK |
4137 | ------------------------------------ |
4138 | -- Analyze_Subprogram_Declaration -- | |
4139 | ------------------------------------ | |
4140 | ||
4141 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
241ebe89 HK |
4142 | GM : constant Ghost_Mode_Type := Ghost_Mode; |
4143 | ||
4144 | procedure Restore_Globals; | |
4145 | -- Restore the values of all saved global variables | |
4146 | ||
4147 | --------------------- | |
4148 | -- Restore_Globals -- | |
4149 | --------------------- | |
4150 | ||
4151 | procedure Restore_Globals is | |
4152 | begin | |
4153 | Ghost_Mode := GM; | |
4154 | end Restore_Globals; | |
4155 | ||
4156 | -- Local variables | |
4157 | ||
579847c2 | 4158 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc | 4159 | Designator : Entity_Id; |
579847c2 | 4160 | |
4d8f3296 ES |
4161 | Is_Completion : Boolean; |
4162 | -- Indicates whether a null procedure declaration is a completion | |
996ae0b0 | 4163 | |
241ebe89 HK |
4164 | -- Start of processing for Analyze_Subprogram_Declaration |
4165 | ||
996ae0b0 | 4166 | begin |
8636f52f HK |
4167 | -- The subprogram declaration may be subject to pragma Ghost with policy |
4168 | -- Ignore. Set the mode now to ensure that any nodes generated during | |
4169 | -- analysis and expansion are properly flagged as ignored Ghost. | |
4170 | ||
4171 | Set_Ghost_Mode (N); | |
4172 | ||
2ba431e5 | 4173 | -- Null procedures are not allowed in SPARK |
daec8eeb | 4174 | |
fe5d3068 | 4175 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
4176 | and then Null_Present (Specification (N)) |
4177 | then | |
ce5ba43a | 4178 | Check_SPARK_05_Restriction ("null procedure is not allowed", N); |
718deaf1 | 4179 | |
73cc8f62 RD |
4180 | -- Null procedures are allowed in protected types, following the |
4181 | -- recent AI12-0147. | |
b741083a ES |
4182 | |
4183 | if Is_Protected_Type (Current_Scope) | |
4184 | and then Ada_Version < Ada_2012 | |
4185 | then | |
4d8f3296 ES |
4186 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
4187 | end if; | |
718deaf1 | 4188 | |
4d8f3296 | 4189 | Analyze_Null_Procedure (N, Is_Completion); |
718deaf1 | 4190 | |
241ebe89 | 4191 | -- The null procedure acts as a body, nothing further is needed |
5d5832bc | 4192 | |
241ebe89 HK |
4193 | if Is_Completion then |
4194 | Restore_Globals; | |
4d8f3296 | 4195 | return; |
5d5832bc AC |
4196 | end if; |
4197 | end if; | |
4198 | ||
beacce02 | 4199 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
4200 | |
4201 | -- A reference may already have been generated for the unit name, in | |
4202 | -- which case the following call is redundant. However it is needed for | |
4203 | -- declarations that are the rewriting of an expression function. | |
4204 | ||
5d5832bc AC |
4205 | Generate_Definition (Designator); |
4206 | ||
f90d14ac AC |
4207 | -- Set SPARK mode from current context (may be overwritten later with |
4208 | -- explicit pragma). | |
4a854847 | 4209 | |
f90d14ac | 4210 | Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
8636f52f | 4211 | Set_SPARK_Pragma_Inherited (Designator); |
579847c2 | 4212 | |
8636f52f | 4213 | -- A subprogram declared within a Ghost region is automatically Ghost |
c5cec2fe AC |
4214 | -- (SPARK RM 6.9(2)). |
4215 | ||
8636f52f | 4216 | if Comes_From_Source (Designator) and then Ghost_Mode > None then |
c5cec2fe AC |
4217 | Set_Is_Ghost_Entity (Designator); |
4218 | end if; | |
4219 | ||
b1b543d2 BD |
4220 | if Debug_Flag_C then |
4221 | Write_Str ("==> subprogram spec "); | |
4222 | Write_Name (Chars (Designator)); | |
4223 | Write_Str (" from "); | |
4224 | Write_Location (Sloc (N)); | |
4225 | Write_Eol; | |
4226 | Indent; | |
4227 | end if; | |
4228 | ||
996ae0b0 | 4229 | Validate_RCI_Subprogram_Declaration (N); |
996ae0b0 RK |
4230 | New_Overloaded_Entity (Designator); |
4231 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 4232 | |
cf3e6845 AC |
4233 | -- If the type of the first formal of the current subprogram is a non- |
4234 | -- generic tagged private type, mark the subprogram as being a private | |
4235 | -- primitive. Ditto if this is a function with controlling result, and | |
4236 | -- the return type is currently private. In both cases, the type of the | |
4237 | -- controlling argument or result must be in the current scope for the | |
4238 | -- operation to be primitive. | |
6ca063eb AC |
4239 | |
4240 | if Has_Controlling_Result (Designator) | |
4241 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 4242 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
4243 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
4244 | then | |
4245 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 4246 | |
6ca063eb | 4247 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
4248 | declare |
4249 | Formal_Typ : constant Entity_Id := | |
4250 | Etype (First_Formal (Designator)); | |
4251 | begin | |
4252 | Set_Is_Private_Primitive (Designator, | |
4253 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 4254 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
4255 | and then Is_Private_Type (Formal_Typ) |
4256 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
4257 | end; | |
4258 | end if; | |
4259 | ||
ec4867fa ES |
4260 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
4261 | -- or null. | |
4262 | ||
0791fbe9 | 4263 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
4264 | and then Comes_From_Source (N) |
4265 | and then Is_Dispatching_Operation (Designator) | |
4266 | then | |
4267 | declare | |
4268 | E : Entity_Id; | |
4269 | Etyp : Entity_Id; | |
4270 | ||
4271 | begin | |
4272 | if Has_Controlling_Result (Designator) then | |
4273 | Etyp := Etype (Designator); | |
4274 | ||
4275 | else | |
4276 | E := First_Entity (Designator); | |
4277 | while Present (E) | |
4278 | and then Is_Formal (E) | |
4279 | and then not Is_Controlling_Formal (E) | |
4280 | loop | |
4281 | Next_Entity (E); | |
4282 | end loop; | |
4283 | ||
4284 | Etyp := Etype (E); | |
4285 | end if; | |
4286 | ||
4287 | if Is_Access_Type (Etyp) then | |
4288 | Etyp := Directly_Designated_Type (Etyp); | |
4289 | end if; | |
4290 | ||
4291 | if Is_Interface (Etyp) | |
f937473f | 4292 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa | 4293 | and then not (Ekind (Designator) = E_Procedure |
8fde064e | 4294 | and then Null_Present (Specification (N))) |
ec4867fa ES |
4295 | then |
4296 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
4297 | |
4298 | -- Specialize error message based on procedures vs. functions, | |
4299 | -- since functions can't be null subprograms. | |
4300 | ||
4301 | if Ekind (Designator) = E_Procedure then | |
4302 | Error_Msg_N | |
4303 | ("interface procedure % must be abstract or null", N); | |
4304 | else | |
3f80a182 AC |
4305 | Error_Msg_N |
4306 | ("interface function % must be abstract", N); | |
033eaf85 | 4307 | end if; |
ec4867fa ES |
4308 | end if; |
4309 | end; | |
4310 | end if; | |
4311 | ||
fbf5a39b AC |
4312 | -- What is the following code for, it used to be |
4313 | ||
4314 | -- ??? Set_Suppress_Elaboration_Checks | |
4315 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
4316 | ||
4317 | -- The following seems equivalent, but a bit dubious | |
4318 | ||
4319 | if Elaboration_Checks_Suppressed (Designator) then | |
4320 | Set_Kill_Elaboration_Checks (Designator); | |
4321 | end if; | |
996ae0b0 | 4322 | |
8fde064e | 4323 | if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then |
fbf5a39b | 4324 | Set_Categorization_From_Scope (Designator, Scop); |
8fde064e | 4325 | |
996ae0b0 | 4326 | else |
e895b435 | 4327 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 4328 | |
0a36105d | 4329 | Push_Scope (Designator); |
996ae0b0 RK |
4330 | Set_Categorization_From_Pragmas (N); |
4331 | Validate_Categorization_Dependency (N, Designator); | |
4332 | Pop_Scope; | |
4333 | end if; | |
4334 | ||
4335 | -- For a compilation unit, set body required. This flag will only be | |
4336 | -- reset if a valid Import or Interface pragma is processed later on. | |
4337 | ||
4338 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
4339 | Set_Body_Required (Parent (N), True); | |
758c442c | 4340 | |
0791fbe9 | 4341 | if Ada_Version >= Ada_2005 |
758c442c GD |
4342 | and then Nkind (Specification (N)) = N_Procedure_Specification |
4343 | and then Null_Present (Specification (N)) | |
4344 | then | |
4345 | Error_Msg_N | |
4346 | ("null procedure cannot be declared at library level", N); | |
4347 | end if; | |
996ae0b0 RK |
4348 | end if; |
4349 | ||
fbf5a39b | 4350 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 4351 | Check_Eliminated (Designator); |
fbf5a39b | 4352 | |
b1b543d2 BD |
4353 | if Debug_Flag_C then |
4354 | Outdent; | |
4355 | Write_Str ("<== subprogram spec "); | |
4356 | Write_Name (Chars (Designator)); | |
4357 | Write_Str (" from "); | |
4358 | Write_Location (Sloc (N)); | |
4359 | Write_Eol; | |
4360 | end if; | |
0f1a6a0b | 4361 | |
1a265e78 AC |
4362 | if Is_Protected_Type (Current_Scope) then |
4363 | ||
4364 | -- Indicate that this is a protected operation, because it may be | |
4365 | -- used in subsequent declarations within the protected type. | |
4366 | ||
4367 | Set_Convention (Designator, Convention_Protected); | |
4368 | end if; | |
4369 | ||
beacce02 | 4370 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
4371 | |
4372 | if Has_Aspects (N) then | |
4373 | Analyze_Aspect_Specifications (N, Designator); | |
4374 | end if; | |
241ebe89 HK |
4375 | |
4376 | Restore_Globals; | |
996ae0b0 RK |
4377 | end Analyze_Subprogram_Declaration; |
4378 | ||
fbf5a39b AC |
4379 | -------------------------------------- |
4380 | -- Analyze_Subprogram_Specification -- | |
4381 | -------------------------------------- | |
4382 | ||
4383 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
4384 | -- declaration). This procedure is called to analyze the specification in | |
4385 | -- both subprogram bodies and subprogram declarations (specs). | |
4386 | ||
4387 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
4388 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 4389 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 4390 | |
758c442c GD |
4391 | -- Start of processing for Analyze_Subprogram_Specification |
4392 | ||
fbf5a39b | 4393 | begin |
2ba431e5 | 4394 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 4395 | |
db72f10a AC |
4396 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
4397 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
4398 | then | |
ce5ba43a AC |
4399 | Check_SPARK_05_Restriction |
4400 | ("user-defined operator is not allowed", N); | |
38171f43 AC |
4401 | end if; |
4402 | ||
31af8899 AC |
4403 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
4404 | -- specification comes from an expression function, because it may be | |
026c3cfd | 4405 | -- the completion of a previous declaration. It is not, the cross- |
31af8899 AC |
4406 | -- reference entry will be emitted for the new subprogram declaration. |
4407 | ||
4408 | if Nkind (Parent (N)) /= N_Expression_Function then | |
4409 | Generate_Definition (Designator); | |
4410 | end if; | |
38171f43 | 4411 | |
fbf5a39b AC |
4412 | if Nkind (N) = N_Function_Specification then |
4413 | Set_Ekind (Designator, E_Function); | |
4414 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
4415 | else |
4416 | Set_Ekind (Designator, E_Procedure); | |
4417 | Set_Etype (Designator, Standard_Void_Type); | |
4418 | end if; | |
4419 | ||
4bd4bb7f AC |
4420 | -- Flag Is_Inlined_Always is True by default, and reversed to False for |
4421 | -- those subprograms which could be inlined in GNATprove mode (because | |
4422 | -- Body_To_Inline is non-Empty) but cannot be inlined. | |
4423 | ||
4424 | if GNATprove_Mode then | |
4425 | Set_Is_Inlined_Always (Designator); | |
4426 | end if; | |
4427 | ||
800621e0 | 4428 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
4429 | |
4430 | Set_Scope (Designator, Current_Scope); | |
4431 | ||
fbf5a39b | 4432 | if Present (Formals) then |
0a36105d | 4433 | Push_Scope (Designator); |
fbf5a39b | 4434 | Process_Formals (Formals, N); |
758c442c | 4435 | |
0929eaeb AC |
4436 | -- Check dimensions in N for formals with default expression |
4437 | ||
4438 | Analyze_Dimension_Formals (N, Formals); | |
4439 | ||
a38ff9b1 ES |
4440 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
4441 | -- inherited interface operation, and the controlling type is | |
4442 | -- a synchronized type, replace the type with its corresponding | |
4443 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
4444 | -- Same processing for an access parameter whose designated type is |
4445 | -- derived from a synchronized interface. | |
758c442c | 4446 | |
0791fbe9 | 4447 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
4448 | declare |
4449 | Formal : Entity_Id; | |
4450 | Formal_Typ : Entity_Id; | |
4451 | Rec_Typ : Entity_Id; | |
69cb258c | 4452 | Desig_Typ : Entity_Id; |
0a36105d | 4453 | |
d44202ba HK |
4454 | begin |
4455 | Formal := First_Formal (Designator); | |
4456 | while Present (Formal) loop | |
4457 | Formal_Typ := Etype (Formal); | |
0a36105d | 4458 | |
d44202ba HK |
4459 | if Is_Concurrent_Type (Formal_Typ) |
4460 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4461 | then | |
4462 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
4463 | ||
4464 | if Present (Interfaces (Rec_Typ)) then | |
4465 | Set_Etype (Formal, Rec_Typ); | |
4466 | end if; | |
69cb258c AC |
4467 | |
4468 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
4469 | Desig_Typ := Designated_Type (Formal_Typ); | |
4470 | ||
4471 | if Is_Concurrent_Type (Desig_Typ) | |
4472 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
4473 | then | |
4474 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
4475 | ||
4476 | if Present (Interfaces (Rec_Typ)) then | |
4477 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
4478 | end if; | |
4479 | end if; | |
d44202ba HK |
4480 | end if; |
4481 | ||
4482 | Next_Formal (Formal); | |
4483 | end loop; | |
4484 | end; | |
758c442c GD |
4485 | end if; |
4486 | ||
fbf5a39b | 4487 | End_Scope; |
82c80734 | 4488 | |
b66c3ff4 AC |
4489 | -- The subprogram scope is pushed and popped around the processing of |
4490 | -- the return type for consistency with call above to Process_Formals | |
4491 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
4492 | -- itype created for the return type will be associated with the proper | |
4493 | -- scope. | |
4494 | ||
82c80734 | 4495 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 4496 | Push_Scope (Designator); |
82c80734 | 4497 | Analyze_Return_Type (N); |
b66c3ff4 | 4498 | End_Scope; |
fbf5a39b AC |
4499 | end if; |
4500 | ||
e606088a AC |
4501 | -- Function case |
4502 | ||
fbf5a39b | 4503 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
4504 | |
4505 | -- Deal with operator symbol case | |
4506 | ||
fbf5a39b AC |
4507 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
4508 | Valid_Operator_Definition (Designator); | |
4509 | end if; | |
4510 | ||
4511 | May_Need_Actuals (Designator); | |
4512 | ||
fe63b1b1 ES |
4513 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
4514 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
4515 | -- declarations, where abstractness is inherited, and to subprogram |
4516 | -- bodies generated for stream operations, which become renamings as | |
4517 | -- bodies. | |
2bfb1b72 | 4518 | |
fe63b1b1 ES |
4519 | -- In case of primitives associated with abstract interface types |
4520 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 4521 | |
1adaea16 | 4522 | if not Nkind_In (Original_Node (Parent (N)), |
3f80a182 AC |
4523 | N_Subprogram_Renaming_Declaration, |
4524 | N_Abstract_Subprogram_Declaration, | |
4525 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 4526 | then |
2e79de51 AC |
4527 | if Is_Abstract_Type (Etype (Designator)) |
4528 | and then not Is_Interface (Etype (Designator)) | |
4529 | then | |
4530 | Error_Msg_N | |
4531 | ("function that returns abstract type must be abstract", N); | |
4532 | ||
e606088a | 4533 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
4534 | -- access result whose designated type is abstract. |
4535 | ||
4536 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
4537 | and then | |
4538 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
4539 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 4540 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
4541 | then |
4542 | Error_Msg_N ("function whose access result designates " | |
3f80a182 | 4543 | & "abstract type must be abstract", N); |
2e79de51 | 4544 | end if; |
fbf5a39b AC |
4545 | end if; |
4546 | end if; | |
4547 | ||
4548 | return Designator; | |
4549 | end Analyze_Subprogram_Specification; | |
4550 | ||
996ae0b0 RK |
4551 | ----------------------- |
4552 | -- Check_Conformance -- | |
4553 | ----------------------- | |
4554 | ||
4555 | procedure Check_Conformance | |
41251c60 JM |
4556 | (New_Id : Entity_Id; |
4557 | Old_Id : Entity_Id; | |
4558 | Ctype : Conformance_Type; | |
4559 | Errmsg : Boolean; | |
4560 | Conforms : out Boolean; | |
4561 | Err_Loc : Node_Id := Empty; | |
4562 | Get_Inst : Boolean := False; | |
4563 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 4564 | is |
996ae0b0 | 4565 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
4566 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
4567 | -- If Errmsg is True, then processing continues to post an error message | |
4568 | -- for conformance error on given node. Two messages are output. The | |
4569 | -- first message points to the previous declaration with a general "no | |
4570 | -- conformance" message. The second is the detailed reason, supplied as | |
4571 | -- Msg. The parameter N provide information for a possible & insertion | |
4572 | -- in the message, and also provides the location for posting the | |
4573 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
4574 | |
4575 | ----------------------- | |
4576 | -- Conformance_Error -- | |
4577 | ----------------------- | |
4578 | ||
4579 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
4580 | Enode : Node_Id; | |
4581 | ||
4582 | begin | |
4583 | Conforms := False; | |
4584 | ||
4585 | if Errmsg then | |
4586 | if No (Err_Loc) then | |
4587 | Enode := N; | |
4588 | else | |
4589 | Enode := Err_Loc; | |
4590 | end if; | |
4591 | ||
4592 | Error_Msg_Sloc := Sloc (Old_Id); | |
4593 | ||
4594 | case Ctype is | |
4595 | when Type_Conformant => | |
483c78cb | 4596 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
4597 | ("not type conformant with declaration#!", Enode); |
4598 | ||
4599 | when Mode_Conformant => | |
19590d70 | 4600 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4601 | Error_Msg_N |
19590d70 GD |
4602 | ("not mode conformant with operation inherited#!", |
4603 | Enode); | |
4604 | else | |
ed2233dc | 4605 | Error_Msg_N |
19590d70 GD |
4606 | ("not mode conformant with declaration#!", Enode); |
4607 | end if; | |
996ae0b0 RK |
4608 | |
4609 | when Subtype_Conformant => | |
19590d70 | 4610 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4611 | Error_Msg_N |
19590d70 GD |
4612 | ("not subtype conformant with operation inherited#!", |
4613 | Enode); | |
4614 | else | |
ed2233dc | 4615 | Error_Msg_N |
19590d70 GD |
4616 | ("not subtype conformant with declaration#!", Enode); |
4617 | end if; | |
996ae0b0 RK |
4618 | |
4619 | when Fully_Conformant => | |
19590d70 | 4620 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 4621 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4622 | ("not fully conformant with operation inherited#!", |
4623 | Enode); | |
4624 | else | |
483c78cb | 4625 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4626 | ("not fully conformant with declaration#!", Enode); |
4627 | end if; | |
996ae0b0 RK |
4628 | end case; |
4629 | ||
4630 | Error_Msg_NE (Msg, Enode, N); | |
4631 | end if; | |
4632 | end Conformance_Error; | |
4633 | ||
ec4867fa ES |
4634 | -- Local Variables |
4635 | ||
4636 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
4637 | New_Type : constant Entity_Id := Etype (New_Id); | |
4638 | Old_Formal : Entity_Id; | |
4639 | New_Formal : Entity_Id; | |
4640 | Access_Types_Match : Boolean; | |
4641 | Old_Formal_Base : Entity_Id; | |
4642 | New_Formal_Base : Entity_Id; | |
4643 | ||
996ae0b0 RK |
4644 | -- Start of processing for Check_Conformance |
4645 | ||
4646 | begin | |
4647 | Conforms := True; | |
4648 | ||
82c80734 RD |
4649 | -- We need a special case for operators, since they don't appear |
4650 | -- explicitly. | |
996ae0b0 RK |
4651 | |
4652 | if Ctype = Type_Conformant then | |
4653 | if Ekind (New_Id) = E_Operator | |
4654 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
4655 | then | |
4656 | return; | |
4657 | end if; | |
4658 | end if; | |
4659 | ||
4660 | -- If both are functions/operators, check return types conform | |
4661 | ||
4662 | if Old_Type /= Standard_Void_Type | |
3cb9a885 AC |
4663 | and then |
4664 | New_Type /= Standard_Void_Type | |
996ae0b0 | 4665 | then |
fceeaab6 ES |
4666 | -- If we are checking interface conformance we omit controlling |
4667 | -- arguments and result, because we are only checking the conformance | |
4668 | -- of the remaining parameters. | |
4669 | ||
4670 | if Has_Controlling_Result (Old_Id) | |
4671 | and then Has_Controlling_Result (New_Id) | |
4672 | and then Skip_Controlling_Formals | |
4673 | then | |
4674 | null; | |
4675 | ||
4676 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
7f568bfa AC |
4677 | if Ctype >= Subtype_Conformant |
4678 | and then not Predicates_Match (Old_Type, New_Type) | |
4679 | then | |
4680 | Conformance_Error | |
4681 | ("\predicate of return type does not match!", New_Id); | |
4682 | else | |
4683 | Conformance_Error | |
4684 | ("\return type does not match!", New_Id); | |
4685 | end if; | |
4686 | ||
996ae0b0 RK |
4687 | return; |
4688 | end if; | |
4689 | ||
41251c60 | 4690 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 4691 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 4692 | |
0791fbe9 | 4693 | if Ada_Version >= Ada_2005 |
41251c60 JM |
4694 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
4695 | and then | |
8fde064e AC |
4696 | (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
4697 | or else Is_Access_Constant (Etype (Old_Type)) /= | |
4698 | Is_Access_Constant (Etype (New_Type))) | |
41251c60 | 4699 | then |
5d37ba92 | 4700 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
4701 | return; |
4702 | end if; | |
4703 | ||
996ae0b0 RK |
4704 | -- If either is a function/operator and the other isn't, error |
4705 | ||
4706 | elsif Old_Type /= Standard_Void_Type | |
4707 | or else New_Type /= Standard_Void_Type | |
4708 | then | |
5d37ba92 | 4709 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
4710 | return; |
4711 | end if; | |
4712 | ||
0a36105d | 4713 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
4714 | -- If this is a renaming as body, refine error message to indicate that |
4715 | -- the conflict is with the original declaration. If the entity is not | |
4716 | -- frozen, the conventions don't have to match, the one of the renamed | |
4717 | -- entity is inherited. | |
4718 | ||
4719 | if Ctype >= Subtype_Conformant then | |
996ae0b0 | 4720 | if Convention (Old_Id) /= Convention (New_Id) then |
996ae0b0 RK |
4721 | if not Is_Frozen (New_Id) then |
4722 | null; | |
4723 | ||
4724 | elsif Present (Err_Loc) | |
4725 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
4726 | and then Present (Corresponding_Spec (Err_Loc)) | |
4727 | then | |
4728 | Error_Msg_Name_1 := Chars (New_Id); | |
4729 | Error_Msg_Name_2 := | |
4730 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 4731 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
4732 | |
4733 | else | |
5d37ba92 | 4734 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
4735 | end if; |
4736 | ||
4737 | return; | |
4738 | ||
4739 | elsif Is_Formal_Subprogram (Old_Id) | |
4740 | or else Is_Formal_Subprogram (New_Id) | |
4741 | then | |
5d37ba92 | 4742 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 | 4743 | return; |
c5cec2fe AC |
4744 | |
4745 | -- Pragma Ghost behaves as a convention in the context of subtype | |
10274386 AC |
4746 | -- conformance (SPARK RM 6.9(5)). Do not check internally generated |
4747 | -- subprograms as their spec may reside in a Ghost region and their | |
4748 | -- body not, or vice versa. | |
c5cec2fe | 4749 | |
10274386 AC |
4750 | elsif Comes_From_Source (Old_Id) |
4751 | and then Comes_From_Source (New_Id) | |
4752 | and then Is_Ghost_Entity (Old_Id) /= Is_Ghost_Entity (New_Id) | |
4753 | then | |
c5cec2fe AC |
4754 | Conformance_Error ("\ghost modes do not match!"); |
4755 | return; | |
996ae0b0 RK |
4756 | end if; |
4757 | end if; | |
4758 | ||
4759 | -- Deal with parameters | |
4760 | ||
4761 | -- Note: we use the entity information, rather than going directly | |
4762 | -- to the specification in the tree. This is not only simpler, but | |
4763 | -- absolutely necessary for some cases of conformance tests between | |
a90bd866 | 4764 | -- operators, where the declaration tree simply does not exist. |
996ae0b0 RK |
4765 | |
4766 | Old_Formal := First_Formal (Old_Id); | |
4767 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 4768 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
4769 | if Is_Controlling_Formal (Old_Formal) |
4770 | and then Is_Controlling_Formal (New_Formal) | |
4771 | and then Skip_Controlling_Formals | |
4772 | then | |
a2dc5812 AC |
4773 | -- The controlling formals will have different types when |
4774 | -- comparing an interface operation with its match, but both | |
4775 | -- or neither must be access parameters. | |
4776 | ||
4777 | if Is_Access_Type (Etype (Old_Formal)) | |
4778 | = | |
4779 | Is_Access_Type (Etype (New_Formal)) | |
4780 | then | |
4781 | goto Skip_Controlling_Formal; | |
4782 | else | |
4783 | Conformance_Error | |
4784 | ("\access parameter does not match!", New_Formal); | |
4785 | end if; | |
41251c60 JM |
4786 | end if; |
4787 | ||
21791d97 | 4788 | -- Ada 2012: Mode conformance also requires that formal parameters |
2a290fec AC |
4789 | -- be both aliased, or neither. |
4790 | ||
21791d97 | 4791 | if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
2a290fec AC |
4792 | if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
4793 | Conformance_Error | |
4794 | ("\aliased parameter mismatch!", New_Formal); | |
4795 | end if; | |
4796 | end if; | |
4797 | ||
fbf5a39b AC |
4798 | if Ctype = Fully_Conformant then |
4799 | ||
4800 | -- Names must match. Error message is more accurate if we do | |
4801 | -- this before checking that the types of the formals match. | |
4802 | ||
4803 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
3ccedacc | 4804 | Conformance_Error ("\name& does not match!", New_Formal); |
fbf5a39b AC |
4805 | |
4806 | -- Set error posted flag on new formal as well to stop | |
4807 | -- junk cascaded messages in some cases. | |
4808 | ||
4809 | Set_Error_Posted (New_Formal); | |
4810 | return; | |
4811 | end if; | |
40b93859 RD |
4812 | |
4813 | -- Null exclusion must match | |
4814 | ||
4815 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
4816 | /= | |
4817 | Null_Exclusion_Present (Parent (New_Formal)) | |
4818 | then | |
4819 | -- Only give error if both come from source. This should be | |
4820 | -- investigated some time, since it should not be needed ??? | |
4821 | ||
4822 | if Comes_From_Source (Old_Formal) | |
4823 | and then | |
4824 | Comes_From_Source (New_Formal) | |
4825 | then | |
4826 | Conformance_Error | |
3ccedacc | 4827 | ("\null exclusion for& does not match", New_Formal); |
40b93859 RD |
4828 | |
4829 | -- Mark error posted on the new formal to avoid duplicated | |
4830 | -- complaint about types not matching. | |
4831 | ||
4832 | Set_Error_Posted (New_Formal); | |
4833 | end if; | |
4834 | end if; | |
fbf5a39b | 4835 | end if; |
996ae0b0 | 4836 | |
ec4867fa ES |
4837 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
4838 | -- case occurs whenever a subprogram is being renamed and one of its | |
4839 | -- parameters imposes a null exclusion. For example: | |
4840 | ||
4841 | -- type T is null record; | |
4842 | -- type Acc_T is access T; | |
4843 | -- subtype Acc_T_Sub is Acc_T; | |
4844 | ||
4845 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
4846 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
4847 | -- renames P; | |
4848 | ||
4849 | Old_Formal_Base := Etype (Old_Formal); | |
4850 | New_Formal_Base := Etype (New_Formal); | |
4851 | ||
4852 | if Get_Inst then | |
4853 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
4854 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
4855 | end if; | |
4856 | ||
0791fbe9 | 4857 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa | 4858 | |
8fde064e AC |
4859 | -- Ensure that this rule is only applied when New_Id is a |
4860 | -- renaming of Old_Id. | |
ec4867fa | 4861 | |
5d37ba92 ES |
4862 | and then Nkind (Parent (Parent (New_Id))) = |
4863 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
4864 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
4865 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
4866 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
4867 | ||
8fde064e | 4868 | -- Now handle the allowed access-type case |
ec4867fa ES |
4869 | |
4870 | and then Is_Access_Type (Old_Formal_Base) | |
4871 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 | 4872 | |
8fde064e AC |
4873 | -- The type kinds must match. The only exception occurs with |
4874 | -- multiple generics of the form: | |
5d37ba92 | 4875 | |
8fde064e AC |
4876 | -- generic generic |
4877 | -- type F is private; type A is private; | |
4878 | -- type F_Ptr is access F; type A_Ptr is access A; | |
4879 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
4880 | -- package F_Pack is ... package A_Pack is | |
4881 | -- package F_Inst is | |
4882 | -- new F_Pack (A, A_Ptr, A_P); | |
5d37ba92 | 4883 | |
8fde064e AC |
4884 | -- When checking for conformance between the parameters of A_P |
4885 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
4886 | -- because the compiler has transformed A_Ptr into a subtype of | |
4887 | -- F_Ptr. We catch this case in the code below. | |
5d37ba92 ES |
4888 | |
4889 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4b6f99f5 RD |
4890 | or else |
4891 | (Is_Generic_Type (Old_Formal_Base) | |
4892 | and then Is_Generic_Type (New_Formal_Base) | |
4893 | and then Is_Internal (New_Formal_Base) | |
4894 | and then Etype (Etype (New_Formal_Base)) = | |
4895 | Old_Formal_Base)) | |
4896 | and then Directly_Designated_Type (Old_Formal_Base) = | |
4897 | Directly_Designated_Type (New_Formal_Base) | |
ec4867fa ES |
4898 | and then ((Is_Itype (Old_Formal_Base) |
4899 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
4b6f99f5 RD |
4900 | or else |
4901 | (Is_Itype (New_Formal_Base) | |
4902 | and then Can_Never_Be_Null (New_Formal_Base))); | |
ec4867fa | 4903 | |
996ae0b0 RK |
4904 | -- Types must always match. In the visible part of an instance, |
4905 | -- usual overloading rules for dispatching operations apply, and | |
4906 | -- we check base types (not the actual subtypes). | |
4907 | ||
4908 | if In_Instance_Visible_Part | |
4909 | and then Is_Dispatching_Operation (New_Id) | |
4910 | then | |
4911 | if not Conforming_Types | |
ec4867fa ES |
4912 | (T1 => Base_Type (Etype (Old_Formal)), |
4913 | T2 => Base_Type (Etype (New_Formal)), | |
4914 | Ctype => Ctype, | |
4915 | Get_Inst => Get_Inst) | |
4916 | and then not Access_Types_Match | |
996ae0b0 | 4917 | then |
5d37ba92 | 4918 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
4919 | return; |
4920 | end if; | |
4921 | ||
4922 | elsif not Conforming_Types | |
5d37ba92 ES |
4923 | (T1 => Old_Formal_Base, |
4924 | T2 => New_Formal_Base, | |
ec4867fa ES |
4925 | Ctype => Ctype, |
4926 | Get_Inst => Get_Inst) | |
4927 | and then not Access_Types_Match | |
996ae0b0 | 4928 | then |
c27f2f15 RD |
4929 | -- Don't give error message if old type is Any_Type. This test |
4930 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
4931 | ||
4932 | if Errmsg and then Old_Formal_Base = Any_Type then | |
4933 | Conforms := False; | |
4934 | else | |
7f568bfa AC |
4935 | if Ctype >= Subtype_Conformant |
4936 | and then | |
4937 | not Predicates_Match (Old_Formal_Base, New_Formal_Base) | |
4938 | then | |
4939 | Conformance_Error | |
4940 | ("\predicate of & does not match!", New_Formal); | |
4941 | else | |
4942 | Conformance_Error | |
4943 | ("\type of & does not match!", New_Formal); | |
4944 | end if; | |
c27f2f15 RD |
4945 | end if; |
4946 | ||
996ae0b0 RK |
4947 | return; |
4948 | end if; | |
4949 | ||
4950 | -- For mode conformance, mode must match | |
4951 | ||
5d37ba92 ES |
4952 | if Ctype >= Mode_Conformant then |
4953 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
4954 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
4955 | or else not Is_Primitive_Wrapper (New_Id) | |
4956 | then | |
4957 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 4958 | |
dd54644b JM |
4959 | else |
4960 | declare | |
c199ccf7 | 4961 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b | 4962 | begin |
3ccedacc | 4963 | if Is_Protected_Type (Corresponding_Concurrent_Type (T)) |
dd54644b | 4964 | then |
2c6336be | 4965 | Error_Msg_PT (New_Id, Ultimate_Alias (Old_Id)); |
dd54644b JM |
4966 | else |
4967 | Conformance_Error | |
4968 | ("\mode of & does not match!", New_Formal); | |
4969 | end if; | |
4970 | end; | |
4971 | end if; | |
4972 | ||
5d37ba92 ES |
4973 | return; |
4974 | ||
4975 | -- Part of mode conformance for access types is having the same | |
4976 | -- constant modifier. | |
4977 | ||
4978 | elsif Access_Types_Match | |
4979 | and then Is_Access_Constant (Old_Formal_Base) /= | |
4980 | Is_Access_Constant (New_Formal_Base) | |
4981 | then | |
4982 | Conformance_Error | |
4983 | ("\constant modifier does not match!", New_Formal); | |
4984 | return; | |
4985 | end if; | |
996ae0b0 RK |
4986 | end if; |
4987 | ||
0a36105d | 4988 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 4989 | |
0a36105d JM |
4990 | -- Ada 2005 (AI-231): In case of anonymous access types check |
4991 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
4992 | -- match. For null exclusion, we test the types rather than the |
4993 | -- formals themselves, since the attribute is only set reliably | |
4994 | -- on the formals in the Ada 95 case, and we exclude the case | |
4995 | -- where Old_Formal is marked as controlling, to avoid errors | |
4996 | -- when matching completing bodies with dispatching declarations | |
4997 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 4998 | |
0791fbe9 | 4999 | if Ada_Version >= Ada_2005 |
0a36105d JM |
5000 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
5001 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
5002 | and then | |
c7b9d548 AC |
5003 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
5004 | Can_Never_Be_Null (Etype (New_Formal)) | |
5005 | and then | |
5006 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
5007 | or else |
5008 | Is_Access_Constant (Etype (Old_Formal)) /= | |
5009 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
5010 | |
5011 | -- Do not complain if error already posted on New_Formal. This | |
5012 | -- avoids some redundant error messages. | |
5013 | ||
5014 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
5015 | then |
5016 | -- It is allowed to omit the null-exclusion in case of stream | |
5017 | -- attribute subprograms. We recognize stream subprograms | |
5018 | -- through their TSS-generated suffix. | |
996ae0b0 | 5019 | |
0a36105d JM |
5020 | declare |
5021 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
3ada950b | 5022 | |
0a36105d JM |
5023 | begin |
5024 | if TSS_Name /= TSS_Stream_Read | |
5025 | and then TSS_Name /= TSS_Stream_Write | |
5026 | and then TSS_Name /= TSS_Stream_Input | |
5027 | and then TSS_Name /= TSS_Stream_Output | |
5028 | then | |
3ada950b | 5029 | -- Here we have a definite conformance error. It is worth |
71fb4dc8 | 5030 | -- special casing the error message for the case of a |
3ada950b AC |
5031 | -- controlling formal (which excludes null). |
5032 | ||
5033 | if Is_Controlling_Formal (New_Formal) then | |
5034 | Error_Msg_Node_2 := Scope (New_Formal); | |
5035 | Conformance_Error | |
3ccedacc AC |
5036 | ("\controlling formal & of & excludes null, " |
5037 | & "declaration must exclude null as well", | |
5038 | New_Formal); | |
3ada950b AC |
5039 | |
5040 | -- Normal case (couldn't we give more detail here???) | |
5041 | ||
5042 | else | |
5043 | Conformance_Error | |
5044 | ("\type of & does not match!", New_Formal); | |
5045 | end if; | |
5046 | ||
0a36105d JM |
5047 | return; |
5048 | end if; | |
5049 | end; | |
5050 | end if; | |
5051 | end if; | |
41251c60 | 5052 | |
0a36105d | 5053 | -- Full conformance checks |
41251c60 | 5054 | |
0a36105d | 5055 | if Ctype = Fully_Conformant then |
e660dbf7 | 5056 | |
0a36105d | 5057 | -- We have checked already that names match |
e660dbf7 | 5058 | |
0a36105d | 5059 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
5060 | |
5061 | -- Check default expressions for in parameters | |
5062 | ||
996ae0b0 RK |
5063 | declare |
5064 | NewD : constant Boolean := | |
5065 | Present (Default_Value (New_Formal)); | |
5066 | OldD : constant Boolean := | |
5067 | Present (Default_Value (Old_Formal)); | |
5068 | begin | |
5069 | if NewD or OldD then | |
5070 | ||
82c80734 RD |
5071 | -- The old default value has been analyzed because the |
5072 | -- current full declaration will have frozen everything | |
0a36105d JM |
5073 | -- before. The new default value has not been analyzed, |
5074 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
5075 | |
5076 | if NewD then | |
0a36105d | 5077 | Push_Scope (New_Id); |
21d27997 | 5078 | Preanalyze_Spec_Expression |
fbf5a39b | 5079 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
5080 | End_Scope; |
5081 | end if; | |
5082 | ||
5083 | if not (NewD and OldD) | |
5084 | or else not Fully_Conformant_Expressions | |
5085 | (Default_Value (Old_Formal), | |
5086 | Default_Value (New_Formal)) | |
5087 | then | |
5088 | Conformance_Error | |
5d37ba92 | 5089 | ("\default expression for & does not match!", |
996ae0b0 RK |
5090 | New_Formal); |
5091 | return; | |
5092 | end if; | |
5093 | end if; | |
5094 | end; | |
5095 | end if; | |
5096 | end if; | |
5097 | ||
5098 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 5099 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
5100 | -- or if either old or new instance is not from the source program. |
5101 | ||
0ab80019 | 5102 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5103 | and then Sloc (Old_Id) > Standard_Location |
5104 | and then Sloc (New_Id) > Standard_Location | |
5105 | and then Comes_From_Source (Old_Id) | |
5106 | and then Comes_From_Source (New_Id) | |
5107 | then | |
5108 | declare | |
5109 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
5110 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
5111 | ||
5112 | begin | |
5113 | -- Explicit IN must be present or absent in both cases. This | |
5114 | -- test is required only in the full conformance case. | |
5115 | ||
5116 | if In_Present (Old_Param) /= In_Present (New_Param) | |
5117 | and then Ctype = Fully_Conformant | |
5118 | then | |
5119 | Conformance_Error | |
5d37ba92 | 5120 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
5121 | New_Formal); |
5122 | return; | |
5123 | end if; | |
5124 | ||
5125 | -- Grouping (use of comma in param lists) must be the same | |
5126 | -- This is where we catch a misconformance like: | |
5127 | ||
0a36105d | 5128 | -- A, B : Integer |
996ae0b0 RK |
5129 | -- A : Integer; B : Integer |
5130 | ||
5131 | -- which are represented identically in the tree except | |
5132 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5133 | ||
5134 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
5135 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
5136 | then | |
5137 | Conformance_Error | |
5d37ba92 | 5138 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
5139 | return; |
5140 | end if; | |
5141 | end; | |
5142 | end if; | |
5143 | ||
41251c60 JM |
5144 | -- This label is required when skipping controlling formals |
5145 | ||
5146 | <<Skip_Controlling_Formal>> | |
5147 | ||
996ae0b0 RK |
5148 | Next_Formal (Old_Formal); |
5149 | Next_Formal (New_Formal); | |
5150 | end loop; | |
5151 | ||
5152 | if Present (Old_Formal) then | |
5d37ba92 | 5153 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
5154 | return; |
5155 | ||
5156 | elsif Present (New_Formal) then | |
5d37ba92 | 5157 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
5158 | return; |
5159 | end if; | |
996ae0b0 RK |
5160 | end Check_Conformance; |
5161 | ||
ec4867fa ES |
5162 | ----------------------- |
5163 | -- Check_Conventions -- | |
5164 | ----------------------- | |
5165 | ||
5166 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 5167 | Ifaces_List : Elist_Id; |
0a36105d | 5168 | |
ce2b6ba5 | 5169 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
5170 | -- Verify that the convention of inherited dispatching operation Op is |
5171 | -- consistent among all subprograms it overrides. In order to minimize | |
5172 | -- the search, Search_From is utilized to designate a specific point in | |
5173 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
5174 | |
5175 | ---------------------- | |
5176 | -- Check_Convention -- | |
5177 | ---------------------- | |
5178 | ||
ce2b6ba5 | 5179 | procedure Check_Convention (Op : Entity_Id) is |
c5cec2fe | 5180 | Op_Conv : constant Convention_Id := Convention (Op); |
9f6aaa5c | 5181 | Iface_Conv : Convention_Id; |
ce2b6ba5 JM |
5182 | Iface_Elmt : Elmt_Id; |
5183 | Iface_Prim_Elmt : Elmt_Id; | |
5184 | Iface_Prim : Entity_Id; | |
ec4867fa | 5185 | |
ce2b6ba5 JM |
5186 | begin |
5187 | Iface_Elmt := First_Elmt (Ifaces_List); | |
5188 | while Present (Iface_Elmt) loop | |
5189 | Iface_Prim_Elmt := | |
9f6aaa5c | 5190 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
ce2b6ba5 JM |
5191 | while Present (Iface_Prim_Elmt) loop |
5192 | Iface_Prim := Node (Iface_Prim_Elmt); | |
c5cec2fe | 5193 | Iface_Conv := Convention (Iface_Prim); |
ce2b6ba5 JM |
5194 | |
5195 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
9f6aaa5c | 5196 | and then Iface_Conv /= Op_Conv |
ce2b6ba5 | 5197 | then |
ed2233dc | 5198 | Error_Msg_N |
ce2b6ba5 | 5199 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 5200 | |
ce2b6ba5 | 5201 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c | 5202 | Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
ce2b6ba5 | 5203 | Error_Msg_Sloc := Sloc (Op); |
ec4867fa | 5204 | |
7a963087 | 5205 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 5206 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 5207 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 5208 | else |
ed2233dc | 5209 | Error_Msg_N |
3ccedacc AC |
5210 | ("\\overriding operation % with " |
5211 | & "convention % defined #", Typ); | |
ce2b6ba5 | 5212 | end if; |
ec4867fa | 5213 | |
ce2b6ba5 JM |
5214 | else pragma Assert (Present (Alias (Op))); |
5215 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
3ccedacc AC |
5216 | Error_Msg_N ("\\inherited operation % with " |
5217 | & "convention % defined #", Typ); | |
ce2b6ba5 | 5218 | end if; |
ec4867fa | 5219 | |
ce2b6ba5 | 5220 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c AC |
5221 | Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
5222 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
3ccedacc AC |
5223 | Error_Msg_N ("\\overridden operation % with " |
5224 | & "convention % defined #", Typ); | |
ec4867fa | 5225 | |
ce2b6ba5 | 5226 | -- Avoid cascading errors |
ec4867fa | 5227 | |
ce2b6ba5 JM |
5228 | return; |
5229 | end if; | |
ec4867fa | 5230 | |
ce2b6ba5 JM |
5231 | Next_Elmt (Iface_Prim_Elmt); |
5232 | end loop; | |
ec4867fa | 5233 | |
ce2b6ba5 | 5234 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
5235 | end loop; |
5236 | end Check_Convention; | |
5237 | ||
5238 | -- Local variables | |
5239 | ||
5240 | Prim_Op : Entity_Id; | |
5241 | Prim_Op_Elmt : Elmt_Id; | |
5242 | ||
5243 | -- Start of processing for Check_Conventions | |
5244 | ||
5245 | begin | |
ce2b6ba5 JM |
5246 | if not Has_Interfaces (Typ) then |
5247 | return; | |
5248 | end if; | |
5249 | ||
5250 | Collect_Interfaces (Typ, Ifaces_List); | |
5251 | ||
0a36105d JM |
5252 | -- The algorithm checks every overriding dispatching operation against |
5253 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 5254 | -- differences in conventions. |
ec4867fa ES |
5255 | |
5256 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
5257 | while Present (Prim_Op_Elmt) loop | |
5258 | Prim_Op := Node (Prim_Op_Elmt); | |
5259 | ||
0a36105d | 5260 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 5261 | -- since they always have the same convention. |
ec4867fa | 5262 | |
ce2b6ba5 JM |
5263 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
5264 | Check_Convention (Prim_Op); | |
ec4867fa ES |
5265 | end if; |
5266 | ||
5267 | Next_Elmt (Prim_Op_Elmt); | |
5268 | end loop; | |
5269 | end Check_Conventions; | |
5270 | ||
996ae0b0 RK |
5271 | ------------------------------ |
5272 | -- Check_Delayed_Subprogram -- | |
5273 | ------------------------------ | |
5274 | ||
5275 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
5276 | F : Entity_Id; | |
5277 | ||
5278 | procedure Possible_Freeze (T : Entity_Id); | |
5279 | -- T is the type of either a formal parameter or of the return type. | |
5280 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
5281 | -- subprogram itself must be delayed. If T is the limited view of an |
5282 | -- incomplete type the subprogram must be frozen as well, because | |
5283 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 5284 | |
82c80734 RD |
5285 | --------------------- |
5286 | -- Possible_Freeze -- | |
5287 | --------------------- | |
5288 | ||
996ae0b0 RK |
5289 | procedure Possible_Freeze (T : Entity_Id) is |
5290 | begin | |
4a13695c | 5291 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
5292 | Set_Has_Delayed_Freeze (Designator); |
5293 | ||
5294 | elsif Is_Access_Type (T) | |
5295 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
5296 | and then not Is_Frozen (Designated_Type (T)) | |
5297 | then | |
5298 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 5299 | |
7b56a91b AC |
5300 | elsif Ekind (T) = E_Incomplete_Type |
5301 | and then From_Limited_With (T) | |
5302 | then | |
e358346d | 5303 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 5304 | |
9aff36e9 RD |
5305 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
5306 | -- of a subprogram or entry declaration. | |
406935b6 AC |
5307 | |
5308 | elsif Ekind (T) = E_Incomplete_Type | |
5309 | and then Ada_Version >= Ada_2012 | |
5310 | then | |
5311 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 5312 | end if; |
4a13695c | 5313 | |
996ae0b0 RK |
5314 | end Possible_Freeze; |
5315 | ||
5316 | -- Start of processing for Check_Delayed_Subprogram | |
5317 | ||
5318 | begin | |
76e3504f AC |
5319 | -- All subprograms, including abstract subprograms, may need a freeze |
5320 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 5321 | |
76e3504f AC |
5322 | Possible_Freeze (Etype (Designator)); |
5323 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 5324 | |
76e3504f AC |
5325 | -- Need delayed freeze if any of the formal types themselves need |
5326 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 5327 | |
76e3504f AC |
5328 | F := First_Formal (Designator); |
5329 | while Present (F) loop | |
5330 | Possible_Freeze (Etype (F)); | |
5331 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
5332 | Next_Formal (F); | |
5333 | end loop; | |
996ae0b0 RK |
5334 | |
5335 | -- Mark functions that return by reference. Note that it cannot be | |
5336 | -- done for delayed_freeze subprograms because the underlying | |
5337 | -- returned type may not be known yet (for private types) | |
5338 | ||
8fde064e | 5339 | if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
996ae0b0 RK |
5340 | declare |
5341 | Typ : constant Entity_Id := Etype (Designator); | |
5342 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
996ae0b0 | 5343 | begin |
51245e2d | 5344 | if Is_Limited_View (Typ) then |
996ae0b0 | 5345 | Set_Returns_By_Ref (Designator); |
048e5cef | 5346 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
5347 | Set_Returns_By_Ref (Designator); |
5348 | end if; | |
5349 | end; | |
5350 | end if; | |
5351 | end Check_Delayed_Subprogram; | |
5352 | ||
5353 | ------------------------------------ | |
5354 | -- Check_Discriminant_Conformance -- | |
5355 | ------------------------------------ | |
5356 | ||
5357 | procedure Check_Discriminant_Conformance | |
5358 | (N : Node_Id; | |
5359 | Prev : Entity_Id; | |
5360 | Prev_Loc : Node_Id) | |
5361 | is | |
5362 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
5363 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
5364 | New_Discr_Id : Entity_Id; | |
5365 | New_Discr_Type : Entity_Id; | |
5366 | ||
5367 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
5368 | -- Post error message for conformance error on given node. Two messages |
5369 | -- are output. The first points to the previous declaration with a | |
5370 | -- general "no conformance" message. The second is the detailed reason, | |
5371 | -- supplied as Msg. The parameter N provide information for a possible | |
5372 | -- & insertion in the message. | |
996ae0b0 RK |
5373 | |
5374 | ----------------------- | |
5375 | -- Conformance_Error -- | |
5376 | ----------------------- | |
5377 | ||
5378 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
5379 | begin | |
5380 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
5381 | Error_Msg_N -- CODEFIX |
5382 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
5383 | Error_Msg_NE (Msg, N, N); |
5384 | end Conformance_Error; | |
5385 | ||
5386 | -- Start of processing for Check_Discriminant_Conformance | |
5387 | ||
5388 | begin | |
5389 | while Present (Old_Discr) and then Present (New_Discr) loop | |
996ae0b0 RK |
5390 | New_Discr_Id := Defining_Identifier (New_Discr); |
5391 | ||
82c80734 RD |
5392 | -- The subtype mark of the discriminant on the full type has not |
5393 | -- been analyzed so we do it here. For an access discriminant a new | |
5394 | -- type is created. | |
996ae0b0 RK |
5395 | |
5396 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
5397 | New_Discr_Type := | |
5398 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
5399 | ||
5400 | else | |
5401 | Analyze (Discriminant_Type (New_Discr)); | |
5402 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
5403 | |
5404 | -- Ada 2005: if the discriminant definition carries a null | |
5405 | -- exclusion, create an itype to check properly for consistency | |
5406 | -- with partial declaration. | |
5407 | ||
5408 | if Is_Access_Type (New_Discr_Type) | |
8fde064e | 5409 | and then Null_Exclusion_Present (New_Discr) |
e50e1c5e AC |
5410 | then |
5411 | New_Discr_Type := | |
5412 | Create_Null_Excluding_Itype | |
5413 | (T => New_Discr_Type, | |
5414 | Related_Nod => New_Discr, | |
5415 | Scope_Id => Current_Scope); | |
5416 | end if; | |
996ae0b0 RK |
5417 | end if; |
5418 | ||
5419 | if not Conforming_Types | |
5420 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
5421 | then | |
5422 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
5423 | return; | |
fbf5a39b | 5424 | else |
82c80734 RD |
5425 | -- Treat the new discriminant as an occurrence of the old one, |
5426 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
5427 | -- information, for completeness. |
5428 | ||
5429 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
5430 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
5431 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
5432 | end if; |
5433 | ||
5434 | -- Names must match | |
5435 | ||
5436 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
5437 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
5438 | return; | |
5439 | end if; | |
5440 | ||
5441 | -- Default expressions must match | |
5442 | ||
5443 | declare | |
5444 | NewD : constant Boolean := | |
5445 | Present (Expression (New_Discr)); | |
5446 | OldD : constant Boolean := | |
5447 | Present (Expression (Parent (Old_Discr))); | |
5448 | ||
5449 | begin | |
5450 | if NewD or OldD then | |
5451 | ||
5452 | -- The old default value has been analyzed and expanded, | |
5453 | -- because the current full declaration will have frozen | |
82c80734 RD |
5454 | -- everything before. The new default values have not been |
5455 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
5456 | |
5457 | if NewD then | |
21d27997 | 5458 | Preanalyze_Spec_Expression |
996ae0b0 RK |
5459 | (Expression (New_Discr), New_Discr_Type); |
5460 | end if; | |
5461 | ||
5462 | if not (NewD and OldD) | |
5463 | or else not Fully_Conformant_Expressions | |
5464 | (Expression (Parent (Old_Discr)), | |
5465 | Expression (New_Discr)) | |
5466 | ||
5467 | then | |
5468 | Conformance_Error | |
5469 | ("default expression for & does not match!", | |
5470 | New_Discr_Id); | |
5471 | return; | |
5472 | end if; | |
5473 | end if; | |
5474 | end; | |
5475 | ||
5476 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
5477 | ||
0ab80019 | 5478 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
5479 | declare |
5480 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
5481 | ||
5482 | begin | |
5483 | -- Grouping (use of comma in param lists) must be the same | |
5484 | -- This is where we catch a misconformance like: | |
5485 | ||
60370fb1 | 5486 | -- A, B : Integer |
996ae0b0 RK |
5487 | -- A : Integer; B : Integer |
5488 | ||
5489 | -- which are represented identically in the tree except | |
5490 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5491 | ||
5492 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
5493 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
5494 | then | |
5495 | Conformance_Error | |
5496 | ("grouping of & does not match!", New_Discr_Id); | |
5497 | return; | |
5498 | end if; | |
5499 | end; | |
5500 | end if; | |
5501 | ||
5502 | Next_Discriminant (Old_Discr); | |
5503 | Next (New_Discr); | |
5504 | end loop; | |
5505 | ||
5506 | if Present (Old_Discr) then | |
5507 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
5508 | return; | |
5509 | ||
5510 | elsif Present (New_Discr) then | |
5511 | Conformance_Error | |
5512 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
5513 | return; | |
5514 | end if; | |
5515 | end Check_Discriminant_Conformance; | |
5516 | ||
5517 | ---------------------------- | |
5518 | -- Check_Fully_Conformant -- | |
5519 | ---------------------------- | |
5520 | ||
5521 | procedure Check_Fully_Conformant | |
5522 | (New_Id : Entity_Id; | |
5523 | Old_Id : Entity_Id; | |
5524 | Err_Loc : Node_Id := Empty) | |
5525 | is | |
5526 | Result : Boolean; | |
81db9d77 | 5527 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5528 | begin |
5529 | Check_Conformance | |
5530 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
5531 | end Check_Fully_Conformant; | |
5532 | ||
5533 | --------------------------- | |
5534 | -- Check_Mode_Conformant -- | |
5535 | --------------------------- | |
5536 | ||
5537 | procedure Check_Mode_Conformant | |
5538 | (New_Id : Entity_Id; | |
5539 | Old_Id : Entity_Id; | |
5540 | Err_Loc : Node_Id := Empty; | |
5541 | Get_Inst : Boolean := False) | |
5542 | is | |
5543 | Result : Boolean; | |
81db9d77 | 5544 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5545 | begin |
5546 | Check_Conformance | |
5547 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
5548 | end Check_Mode_Conformant; | |
5549 | ||
fbf5a39b | 5550 | -------------------------------- |
758c442c | 5551 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
5552 | -------------------------------- |
5553 | ||
758c442c | 5554 | procedure Check_Overriding_Indicator |
ec4867fa | 5555 | (Subp : Entity_Id; |
5d37ba92 ES |
5556 | Overridden_Subp : Entity_Id; |
5557 | Is_Primitive : Boolean) | |
fbf5a39b | 5558 | is |
758c442c GD |
5559 | Decl : Node_Id; |
5560 | Spec : Node_Id; | |
fbf5a39b AC |
5561 | |
5562 | begin | |
ec4867fa | 5563 | -- No overriding indicator for literals |
fbf5a39b | 5564 | |
ec4867fa | 5565 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 5566 | return; |
fbf5a39b | 5567 | |
ec4867fa ES |
5568 | elsif Ekind (Subp) = E_Entry then |
5569 | Decl := Parent (Subp); | |
5570 | ||
53b10ce9 AC |
5571 | -- No point in analyzing a malformed operator |
5572 | ||
5573 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
5574 | and then Error_Posted (Subp) | |
5575 | then | |
5576 | return; | |
5577 | ||
758c442c GD |
5578 | else |
5579 | Decl := Unit_Declaration_Node (Subp); | |
5580 | end if; | |
fbf5a39b | 5581 | |
800621e0 RD |
5582 | if Nkind_In (Decl, N_Subprogram_Body, |
5583 | N_Subprogram_Body_Stub, | |
5584 | N_Subprogram_Declaration, | |
5585 | N_Abstract_Subprogram_Declaration, | |
5586 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
5587 | then |
5588 | Spec := Specification (Decl); | |
ec4867fa ES |
5589 | |
5590 | elsif Nkind (Decl) = N_Entry_Declaration then | |
5591 | Spec := Decl; | |
5592 | ||
758c442c GD |
5593 | else |
5594 | return; | |
5595 | end if; | |
fbf5a39b | 5596 | |
e7d72fb9 AC |
5597 | -- The overriding operation is type conformant with the overridden one, |
5598 | -- but the names of the formals are not required to match. If the names | |
6823270c | 5599 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
5600 | -- source of confusion that is worth diagnosing. Controlling formals |
5601 | -- often carry names that reflect the type, and it is not worthwhile | |
5602 | -- requiring that their names match. | |
5603 | ||
c9e7bd8e | 5604 | if Present (Overridden_Subp) |
e7d72fb9 AC |
5605 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
5606 | then | |
5607 | declare | |
5608 | Form1 : Entity_Id; | |
5609 | Form2 : Entity_Id; | |
5610 | ||
5611 | begin | |
5612 | Form1 := First_Formal (Subp); | |
5613 | Form2 := First_Formal (Overridden_Subp); | |
5614 | ||
c9e7bd8e AC |
5615 | -- If the overriding operation is a synchronized operation, skip |
5616 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
5617 | -- implicit in the new one. If the operation is declared in the |
5618 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 5619 | |
6823270c AC |
5620 | if Is_Concurrent_Type (Scope (Subp)) |
5621 | and then Is_Tagged_Type (Scope (Subp)) | |
5622 | and then not Has_Completion (Scope (Subp)) | |
5623 | then | |
c9e7bd8e AC |
5624 | Form2 := Next_Formal (Form2); |
5625 | end if; | |
5626 | ||
e7d72fb9 AC |
5627 | if Present (Form1) then |
5628 | Form1 := Next_Formal (Form1); | |
5629 | Form2 := Next_Formal (Form2); | |
5630 | end if; | |
5631 | ||
5632 | while Present (Form1) loop | |
5633 | if not Is_Controlling_Formal (Form1) | |
5634 | and then Present (Next_Formal (Form2)) | |
5635 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
5636 | then | |
5637 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
5638 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 5639 | Error_Msg_NE |
19d846a0 | 5640 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
5641 | Form1, Form1); |
5642 | exit; | |
5643 | end if; | |
5644 | ||
5645 | Next_Formal (Form1); | |
5646 | Next_Formal (Form2); | |
5647 | end loop; | |
5648 | end; | |
5649 | end if; | |
5650 | ||
676e8420 AC |
5651 | -- If there is an overridden subprogram, then check that there is no |
5652 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
5653 | -- This is not done if the overridden subprogram is marked as hidden, |
5654 | -- which can occur for the case of inherited controlled operations | |
5655 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
5656 | -- subprogram is not itself hidden. (Note: This condition could probably | |
5657 | -- be simplified, leaving out the testing for the specific controlled | |
5658 | -- cases, but it seems safer and clearer this way, and echoes similar | |
5659 | -- special-case tests of this kind in other places.) | |
5660 | ||
fd0d899b | 5661 | if Present (Overridden_Subp) |
51bf9bdf AC |
5662 | and then (not Is_Hidden (Overridden_Subp) |
5663 | or else | |
b69cd36a AC |
5664 | (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
5665 | Name_Adjust, | |
5666 | Name_Finalize) | |
f0709ca6 AC |
5667 | and then Present (Alias (Overridden_Subp)) |
5668 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 5669 | then |
ec4867fa ES |
5670 | if Must_Not_Override (Spec) then |
5671 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 5672 | |
ec4867fa | 5673 | if Ekind (Subp) = E_Entry then |
ed2233dc | 5674 | Error_Msg_NE |
5d37ba92 | 5675 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5676 | else |
ed2233dc | 5677 | Error_Msg_NE |
5d37ba92 | 5678 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5679 | end if; |
21d27997 | 5680 | |
bd603506 | 5681 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
5682 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
5683 | -- operation. This operation should not be inherited by other limited | |
5684 | -- controlled types. An explicit Adjust for them is not overriding. | |
5685 | ||
5686 | elsif Must_Override (Spec) | |
5687 | and then Chars (Overridden_Subp) = Name_Adjust | |
5688 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
5689 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
5690 | and then |
5691 | Is_Predefined_File_Name | |
5692 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
5693 | then |
5694 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5695 | ||
21d27997 | 5696 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
5697 | if Is_Init_Proc (Subp) then |
5698 | null; | |
5699 | ||
5700 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
5701 | |
5702 | -- For entities generated by Derive_Subprograms the overridden | |
5703 | -- operation is the inherited primitive (which is available | |
5704 | -- through the attribute alias) | |
5705 | ||
5706 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 5707 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 5708 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
5709 | and then Find_Dispatching_Type (Overridden_Subp) = |
5710 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
5711 | and then Present (Alias (Overridden_Subp)) |
5712 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
5713 | then | |
039538bc AC |
5714 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); |
5715 | Inherit_Subprogram_Contract (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 5716 | |
1c1289e7 | 5717 | else |
039538bc AC |
5718 | Set_Overridden_Operation (Subp, Overridden_Subp); |
5719 | Inherit_Subprogram_Contract (Subp, Overridden_Subp); | |
1c1289e7 AC |
5720 | end if; |
5721 | end if; | |
ec4867fa | 5722 | end if; |
f937473f | 5723 | |
618fb570 AC |
5724 | -- If primitive flag is set or this is a protected operation, then |
5725 | -- the operation is overriding at the point of its declaration, so | |
5726 | -- warn if necessary. Otherwise it may have been declared before the | |
5727 | -- operation it overrides and no check is required. | |
3c25856a AC |
5728 | |
5729 | if Style_Check | |
618fb570 AC |
5730 | and then not Must_Override (Spec) |
5731 | and then (Is_Primitive | |
5732 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 5733 | then |
235f4375 AC |
5734 | Style.Missing_Overriding (Decl, Subp); |
5735 | end if; | |
5736 | ||
53b10ce9 AC |
5737 | -- If Subp is an operator, it may override a predefined operation, if |
5738 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 5739 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
5740 | -- representation for predefined operators. We have to check whether the |
5741 | -- signature of Subp matches that of a predefined operator. Note that | |
5742 | -- first argument provides the name of the operator, and the second | |
5743 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
5744 | -- If the indicator is overriding, then the operator must match a |
5745 | -- predefined signature, because we know already that there is no | |
5746 | -- explicit overridden operation. | |
f937473f | 5747 | |
21d27997 | 5748 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 5749 | if Must_Not_Override (Spec) then |
f937473f | 5750 | |
806f6d37 AC |
5751 | -- If this is not a primitive or a protected subprogram, then |
5752 | -- "not overriding" is illegal. | |
618fb570 | 5753 | |
806f6d37 AC |
5754 | if not Is_Primitive |
5755 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5756 | then | |
3ccedacc AC |
5757 | Error_Msg_N ("overriding indicator only allowed " |
5758 | & "if subprogram is primitive", Subp); | |
618fb570 | 5759 | |
806f6d37 AC |
5760 | elsif Can_Override_Operator (Subp) then |
5761 | Error_Msg_NE | |
5762 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
5763 | end if; | |
f937473f | 5764 | |
806f6d37 AC |
5765 | elsif Must_Override (Spec) then |
5766 | if No (Overridden_Operation (Subp)) | |
5767 | and then not Can_Override_Operator (Subp) | |
5768 | then | |
5769 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5770 | end if; | |
5d37ba92 | 5771 | |
806f6d37 AC |
5772 | elsif not Error_Posted (Subp) |
5773 | and then Style_Check | |
5774 | and then Can_Override_Operator (Subp) | |
5775 | and then | |
5776 | not Is_Predefined_File_Name | |
5777 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
5778 | then | |
5779 | -- If style checks are enabled, indicate that the indicator is | |
5780 | -- missing. However, at the point of declaration, the type of | |
5781 | -- which this is a primitive operation may be private, in which | |
5782 | -- case the indicator would be premature. | |
235f4375 | 5783 | |
806f6d37 AC |
5784 | if Has_Private_Declaration (Etype (Subp)) |
5785 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 5786 | then |
806f6d37 AC |
5787 | null; |
5788 | else | |
5789 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 5790 | end if; |
806f6d37 | 5791 | end if; |
21d27997 RD |
5792 | |
5793 | elsif Must_Override (Spec) then | |
5794 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 5795 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 5796 | else |
ed2233dc | 5797 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 5798 | end if; |
5d37ba92 ES |
5799 | |
5800 | -- If the operation is marked "not overriding" and it's not primitive | |
5801 | -- then an error is issued, unless this is an operation of a task or | |
5802 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
5803 | -- has been specified have already been checked above. | |
5804 | ||
5805 | elsif Must_Not_Override (Spec) | |
5806 | and then not Is_Primitive | |
5807 | and then Ekind (Subp) /= E_Entry | |
5808 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5809 | then | |
ed2233dc | 5810 | Error_Msg_N |
5d37ba92 ES |
5811 | ("overriding indicator only allowed if subprogram is primitive", |
5812 | Subp); | |
5d37ba92 | 5813 | return; |
fbf5a39b | 5814 | end if; |
758c442c | 5815 | end Check_Overriding_Indicator; |
fbf5a39b | 5816 | |
996ae0b0 RK |
5817 | ------------------- |
5818 | -- Check_Returns -- | |
5819 | ------------------- | |
5820 | ||
0a36105d JM |
5821 | -- Note: this procedure needs to know far too much about how the expander |
5822 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
5823 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
5824 | -- works, but is not very clean. It would be better if the expansion | |
5825 | -- routines would leave Original_Node working nicely, and we could use | |
5826 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
5827 | ||
996ae0b0 RK |
5828 | procedure Check_Returns |
5829 | (HSS : Node_Id; | |
5830 | Mode : Character; | |
c8ef728f ES |
5831 | Err : out Boolean; |
5832 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
5833 | is |
5834 | Handler : Node_Id; | |
5835 | ||
5836 | procedure Check_Statement_Sequence (L : List_Id); | |
5837 | -- Internal recursive procedure to check a list of statements for proper | |
5838 | -- termination by a return statement (or a transfer of control or a | |
5839 | -- compound statement that is itself internally properly terminated). | |
5840 | ||
5841 | ------------------------------ | |
5842 | -- Check_Statement_Sequence -- | |
5843 | ------------------------------ | |
5844 | ||
5845 | procedure Check_Statement_Sequence (L : List_Id) is | |
5846 | Last_Stm : Node_Id; | |
0a36105d | 5847 | Stm : Node_Id; |
996ae0b0 RK |
5848 | Kind : Node_Kind; |
5849 | ||
7b27e183 AC |
5850 | function Assert_False return Boolean; |
5851 | -- Returns True if Last_Stm is a pragma Assert (False) that has been | |
5852 | -- rewritten as a null statement when assertions are off. The assert | |
5853 | -- is not active, but it is still enough to kill the warning. | |
5854 | ||
5855 | ------------------ | |
5856 | -- Assert_False -- | |
5857 | ------------------ | |
5858 | ||
5859 | function Assert_False return Boolean is | |
5860 | Orig : constant Node_Id := Original_Node (Last_Stm); | |
5861 | ||
5862 | begin | |
5863 | if Nkind (Orig) = N_Pragma | |
5864 | and then Pragma_Name (Orig) = Name_Assert | |
5865 | and then not Error_Posted (Orig) | |
5866 | then | |
5867 | declare | |
5868 | Arg : constant Node_Id := | |
5869 | First (Pragma_Argument_Associations (Orig)); | |
5870 | Exp : constant Node_Id := Expression (Arg); | |
5871 | begin | |
5872 | return Nkind (Exp) = N_Identifier | |
5873 | and then Chars (Exp) = Name_False; | |
5874 | end; | |
5875 | ||
5876 | else | |
5877 | return False; | |
5878 | end if; | |
5879 | end Assert_False; | |
5880 | ||
5881 | -- Local variables | |
5882 | ||
996ae0b0 RK |
5883 | Raise_Exception_Call : Boolean; |
5884 | -- Set True if statement sequence terminated by Raise_Exception call | |
5885 | -- or a Reraise_Occurrence call. | |
5886 | ||
7b27e183 AC |
5887 | -- Start of processing for Check_Statement_Sequence |
5888 | ||
996ae0b0 RK |
5889 | begin |
5890 | Raise_Exception_Call := False; | |
5891 | ||
5892 | -- Get last real statement | |
5893 | ||
5894 | Last_Stm := Last (L); | |
5895 | ||
0a36105d JM |
5896 | -- Deal with digging out exception handler statement sequences that |
5897 | -- have been transformed by the local raise to goto optimization. | |
5898 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
5899 | -- optimization has occurred, we are looking at something like: | |
5900 | ||
5901 | -- begin | |
5902 | -- original stmts in block | |
5903 | ||
5904 | -- exception \ | |
5905 | -- when excep1 => | | |
5906 | -- goto L1; | omitted if No_Exception_Propagation | |
5907 | -- when excep2 => | | |
5908 | -- goto L2; / | |
5909 | -- end; | |
5910 | ||
5911 | -- goto L3; -- skip handler when exception not raised | |
5912 | ||
5913 | -- <<L1>> -- target label for local exception | |
5914 | -- begin | |
5915 | -- estmts1 | |
5916 | -- end; | |
5917 | ||
5918 | -- goto L3; | |
5919 | ||
5920 | -- <<L2>> | |
5921 | -- begin | |
5922 | -- estmts2 | |
5923 | -- end; | |
5924 | ||
5925 | -- <<L3>> | |
5926 | ||
5927 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
5928 | -- sequences (which were the original sequences of statements in | |
5929 | -- the exception handlers) and check them. | |
5930 | ||
8fde064e | 5931 | if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
0a36105d JM |
5932 | Stm := Last_Stm; |
5933 | loop | |
5934 | Prev (Stm); | |
5935 | exit when No (Stm); | |
5936 | exit when Nkind (Stm) /= N_Block_Statement; | |
5937 | exit when not Exception_Junk (Stm); | |
5938 | Prev (Stm); | |
5939 | exit when No (Stm); | |
5940 | exit when Nkind (Stm) /= N_Label; | |
5941 | exit when not Exception_Junk (Stm); | |
5942 | Check_Statement_Sequence | |
5943 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
5944 | ||
5945 | Prev (Stm); | |
5946 | Last_Stm := Stm; | |
5947 | exit when No (Stm); | |
5948 | exit when Nkind (Stm) /= N_Goto_Statement; | |
5949 | exit when not Exception_Junk (Stm); | |
5950 | end loop; | |
5951 | end if; | |
5952 | ||
996ae0b0 RK |
5953 | -- Don't count pragmas |
5954 | ||
5955 | while Nkind (Last_Stm) = N_Pragma | |
5956 | ||
5957 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
5958 | ||
5959 | or else | |
5960 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
5961 | and then | |
5962 | Nkind (Name (Last_Stm)) = N_Identifier | |
5963 | and then | |
5964 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
5965 | ||
5966 | -- Don't count exception junk | |
5967 | ||
5968 | or else | |
800621e0 RD |
5969 | (Nkind_In (Last_Stm, N_Goto_Statement, |
5970 | N_Label, | |
5971 | N_Object_Declaration) | |
8fde064e | 5972 | and then Exception_Junk (Last_Stm)) |
0a36105d JM |
5973 | or else Nkind (Last_Stm) in N_Push_xxx_Label |
5974 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
e3b3266c AC |
5975 | |
5976 | -- Inserted code, such as finalization calls, is irrelevant: we only | |
5977 | -- need to check original source. | |
5978 | ||
5979 | or else Is_Rewrite_Insertion (Last_Stm) | |
996ae0b0 RK |
5980 | loop |
5981 | Prev (Last_Stm); | |
5982 | end loop; | |
5983 | ||
5984 | -- Here we have the "real" last statement | |
5985 | ||
5986 | Kind := Nkind (Last_Stm); | |
5987 | ||
5988 | -- Transfer of control, OK. Note that in the No_Return procedure | |
5989 | -- case, we already diagnosed any explicit return statements, so | |
5990 | -- we can treat them as OK in this context. | |
5991 | ||
5992 | if Is_Transfer (Last_Stm) then | |
5993 | return; | |
5994 | ||
5995 | -- Check cases of explicit non-indirect procedure calls | |
5996 | ||
5997 | elsif Kind = N_Procedure_Call_Statement | |
5998 | and then Is_Entity_Name (Name (Last_Stm)) | |
5999 | then | |
6000 | -- Check call to Raise_Exception procedure which is treated | |
6001 | -- specially, as is a call to Reraise_Occurrence. | |
6002 | ||
6003 | -- We suppress the warning in these cases since it is likely that | |
6004 | -- the programmer really does not expect to deal with the case | |
6005 | -- of Null_Occurrence, and thus would find a warning about a | |
6006 | -- missing return curious, and raising Program_Error does not | |
6007 | -- seem such a bad behavior if this does occur. | |
6008 | ||
c8ef728f ES |
6009 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
6010 | -- behavior will be to raise Constraint_Error (see AI-329). | |
6011 | ||
996ae0b0 RK |
6012 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
6013 | or else | |
6014 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
6015 | then | |
6016 | Raise_Exception_Call := True; | |
6017 | ||
6018 | -- For Raise_Exception call, test first argument, if it is | |
6019 | -- an attribute reference for a 'Identity call, then we know | |
6020 | -- that the call cannot possibly return. | |
6021 | ||
6022 | declare | |
6023 | Arg : constant Node_Id := | |
6024 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
6025 | begin |
6026 | if Nkind (Arg) = N_Attribute_Reference | |
6027 | and then Attribute_Name (Arg) = Name_Identity | |
6028 | then | |
6029 | return; | |
6030 | end if; | |
6031 | end; | |
6032 | end if; | |
6033 | ||
6034 | -- If statement, need to look inside if there is an else and check | |
6035 | -- each constituent statement sequence for proper termination. | |
6036 | ||
6037 | elsif Kind = N_If_Statement | |
6038 | and then Present (Else_Statements (Last_Stm)) | |
6039 | then | |
6040 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
6041 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6042 | ||
6043 | if Present (Elsif_Parts (Last_Stm)) then | |
6044 | declare | |
6045 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
6046 | ||
6047 | begin | |
6048 | while Present (Elsif_Part) loop | |
6049 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
6050 | Next (Elsif_Part); | |
6051 | end loop; | |
6052 | end; | |
6053 | end if; | |
6054 | ||
6055 | return; | |
6056 | ||
6057 | -- Case statement, check each case for proper termination | |
6058 | ||
6059 | elsif Kind = N_Case_Statement then | |
6060 | declare | |
6061 | Case_Alt : Node_Id; | |
996ae0b0 RK |
6062 | begin |
6063 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
6064 | while Present (Case_Alt) loop | |
6065 | Check_Statement_Sequence (Statements (Case_Alt)); | |
6066 | Next_Non_Pragma (Case_Alt); | |
6067 | end loop; | |
6068 | end; | |
6069 | ||
6070 | return; | |
6071 | ||
6072 | -- Block statement, check its handled sequence of statements | |
6073 | ||
6074 | elsif Kind = N_Block_Statement then | |
6075 | declare | |
6076 | Err1 : Boolean; | |
6077 | ||
6078 | begin | |
6079 | Check_Returns | |
6080 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
6081 | ||
6082 | if Err1 then | |
6083 | Err := True; | |
6084 | end if; | |
6085 | ||
6086 | return; | |
6087 | end; | |
6088 | ||
6089 | -- Loop statement. If there is an iteration scheme, we can definitely | |
6090 | -- fall out of the loop. Similarly if there is an exit statement, we | |
6091 | -- can fall out. In either case we need a following return. | |
6092 | ||
6093 | elsif Kind = N_Loop_Statement then | |
6094 | if Present (Iteration_Scheme (Last_Stm)) | |
6095 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
6096 | then | |
6097 | null; | |
6098 | ||
f3d57416 RW |
6099 | -- A loop with no exit statement or iteration scheme is either |
6100 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
6101 | -- In either case, no warning is required. |
6102 | ||
6103 | else | |
6104 | return; | |
6105 | end if; | |
6106 | ||
6107 | -- Timed entry call, check entry call and delay alternatives | |
6108 | ||
6109 | -- Note: in expanded code, the timed entry call has been converted | |
6110 | -- to a set of expanded statements on which the check will work | |
6111 | -- correctly in any case. | |
6112 | ||
6113 | elsif Kind = N_Timed_Entry_Call then | |
6114 | declare | |
6115 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6116 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
6117 | ||
6118 | begin | |
6119 | -- If statement sequence of entry call alternative is missing, | |
6120 | -- then we can definitely fall through, and we post the error | |
6121 | -- message on the entry call alternative itself. | |
6122 | ||
6123 | if No (Statements (ECA)) then | |
6124 | Last_Stm := ECA; | |
6125 | ||
6126 | -- If statement sequence of delay alternative is missing, then | |
6127 | -- we can definitely fall through, and we post the error | |
6128 | -- message on the delay alternative itself. | |
6129 | ||
6130 | -- Note: if both ECA and DCA are missing the return, then we | |
6131 | -- post only one message, should be enough to fix the bugs. | |
6132 | -- If not we will get a message next time on the DCA when the | |
a90bd866 | 6133 | -- ECA is fixed. |
996ae0b0 RK |
6134 | |
6135 | elsif No (Statements (DCA)) then | |
6136 | Last_Stm := DCA; | |
6137 | ||
6138 | -- Else check both statement sequences | |
6139 | ||
6140 | else | |
6141 | Check_Statement_Sequence (Statements (ECA)); | |
6142 | Check_Statement_Sequence (Statements (DCA)); | |
6143 | return; | |
6144 | end if; | |
6145 | end; | |
6146 | ||
6147 | -- Conditional entry call, check entry call and else part | |
6148 | ||
6149 | -- Note: in expanded code, the conditional entry call has been | |
6150 | -- converted to a set of expanded statements on which the check | |
6151 | -- will work correctly in any case. | |
6152 | ||
6153 | elsif Kind = N_Conditional_Entry_Call then | |
6154 | declare | |
6155 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6156 | ||
6157 | begin | |
6158 | -- If statement sequence of entry call alternative is missing, | |
6159 | -- then we can definitely fall through, and we post the error | |
6160 | -- message on the entry call alternative itself. | |
6161 | ||
6162 | if No (Statements (ECA)) then | |
6163 | Last_Stm := ECA; | |
6164 | ||
6165 | -- Else check statement sequence and else part | |
6166 | ||
6167 | else | |
6168 | Check_Statement_Sequence (Statements (ECA)); | |
6169 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6170 | return; | |
6171 | end if; | |
6172 | end; | |
6173 | end if; | |
6174 | ||
6175 | -- If we fall through, issue appropriate message | |
6176 | ||
6177 | if Mode = 'F' then | |
7b27e183 AC |
6178 | |
6179 | -- Kill warning if last statement is a raise exception call, | |
6180 | -- or a pragma Assert (False). Note that with assertions enabled, | |
6181 | -- such a pragma has been converted into a raise exception call | |
6182 | -- already, so the Assert_False is for the assertions off case. | |
6183 | ||
6184 | if not Raise_Exception_Call and then not Assert_False then | |
b465ef6f AC |
6185 | |
6186 | -- In GNATprove mode, it is an error to have a missing return | |
6187 | ||
43417b90 | 6188 | Error_Msg_Warn := SPARK_Mode /= On; |
7b27e183 AC |
6189 | |
6190 | -- Issue error message or warning | |
6191 | ||
4a28b181 AC |
6192 | Error_Msg_N |
6193 | ("RETURN statement missing following this statement<<!", | |
6194 | Last_Stm); | |
6195 | Error_Msg_N | |
6196 | ("\Program_Error ]<<!", Last_Stm); | |
996ae0b0 RK |
6197 | end if; |
6198 | ||
6199 | -- Note: we set Err even though we have not issued a warning | |
6200 | -- because we still have a case of a missing return. This is | |
6201 | -- an extremely marginal case, probably will never be noticed | |
6202 | -- but we might as well get it right. | |
6203 | ||
6204 | Err := True; | |
6205 | ||
c8ef728f ES |
6206 | -- Otherwise we have the case of a procedure marked No_Return |
6207 | ||
996ae0b0 | 6208 | else |
800621e0 | 6209 | if not Raise_Exception_Call then |
4a28b181 AC |
6210 | if GNATprove_Mode then |
6211 | Error_Msg_N | |
6212 | ("implied return after this statement " | |
6213 | & "would have raised Program_Error", Last_Stm); | |
6214 | else | |
6215 | Error_Msg_N | |
6216 | ("implied return after this statement " | |
6217 | & "will raise Program_Error??", Last_Stm); | |
6218 | end if; | |
6219 | ||
43417b90 | 6220 | Error_Msg_Warn := SPARK_Mode /= On; |
800621e0 | 6221 | Error_Msg_NE |
4a28b181 | 6222 | ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
800621e0 | 6223 | end if; |
c8ef728f ES |
6224 | |
6225 | declare | |
6226 | RE : constant Node_Id := | |
6227 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
6228 | Reason => PE_Implicit_Return); | |
6229 | begin | |
6230 | Insert_After (Last_Stm, RE); | |
6231 | Analyze (RE); | |
6232 | end; | |
996ae0b0 RK |
6233 | end if; |
6234 | end Check_Statement_Sequence; | |
6235 | ||
6236 | -- Start of processing for Check_Returns | |
6237 | ||
6238 | begin | |
6239 | Err := False; | |
6240 | Check_Statement_Sequence (Statements (HSS)); | |
6241 | ||
6242 | if Present (Exception_Handlers (HSS)) then | |
6243 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
6244 | while Present (Handler) loop | |
6245 | Check_Statement_Sequence (Statements (Handler)); | |
6246 | Next_Non_Pragma (Handler); | |
6247 | end loop; | |
6248 | end if; | |
6249 | end Check_Returns; | |
6250 | ||
6251 | ---------------------------- | |
6252 | -- Check_Subprogram_Order -- | |
6253 | ---------------------------- | |
6254 | ||
6255 | procedure Check_Subprogram_Order (N : Node_Id) is | |
6256 | ||
6257 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
6258 | -- This is used to check if S1 > S2 in the sense required by this test, |
6259 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 6260 | |
82c80734 RD |
6261 | ----------------------------- |
6262 | -- Subprogram_Name_Greater -- | |
6263 | ----------------------------- | |
6264 | ||
996ae0b0 RK |
6265 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
6266 | L1, L2 : Positive; | |
6267 | N1, N2 : Natural; | |
6268 | ||
6269 | begin | |
67336960 AC |
6270 | -- Deal with special case where names are identical except for a |
6271 | -- numerical suffix. These are handled specially, taking the numeric | |
6272 | -- ordering from the suffix into account. | |
996ae0b0 RK |
6273 | |
6274 | L1 := S1'Last; | |
6275 | while S1 (L1) in '0' .. '9' loop | |
6276 | L1 := L1 - 1; | |
6277 | end loop; | |
6278 | ||
6279 | L2 := S2'Last; | |
6280 | while S2 (L2) in '0' .. '9' loop | |
6281 | L2 := L2 - 1; | |
6282 | end loop; | |
6283 | ||
67336960 | 6284 | -- If non-numeric parts non-equal, do straight compare |
996ae0b0 | 6285 | |
67336960 AC |
6286 | if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
6287 | return S1 > S2; | |
996ae0b0 RK |
6288 | |
6289 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
6290 | -- that a missing suffix is treated as numeric zero in this test. | |
6291 | ||
6292 | else | |
6293 | N1 := 0; | |
6294 | while L1 < S1'Last loop | |
6295 | L1 := L1 + 1; | |
6296 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
6297 | end loop; | |
6298 | ||
6299 | N2 := 0; | |
6300 | while L2 < S2'Last loop | |
6301 | L2 := L2 + 1; | |
6302 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
6303 | end loop; | |
6304 | ||
6305 | return N1 > N2; | |
6306 | end if; | |
6307 | end Subprogram_Name_Greater; | |
6308 | ||
6309 | -- Start of processing for Check_Subprogram_Order | |
6310 | ||
6311 | begin | |
6312 | -- Check body in alpha order if this is option | |
6313 | ||
fbf5a39b | 6314 | if Style_Check |
bc202b70 | 6315 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
6316 | and then Nkind (N) = N_Subprogram_Body |
6317 | and then Comes_From_Source (N) | |
6318 | and then In_Extended_Main_Source_Unit (N) | |
6319 | then | |
6320 | declare | |
6321 | LSN : String_Ptr | |
6322 | renames Scope_Stack.Table | |
6323 | (Scope_Stack.Last).Last_Subprogram_Name; | |
6324 | ||
6325 | Body_Id : constant Entity_Id := | |
6326 | Defining_Entity (Specification (N)); | |
6327 | ||
6328 | begin | |
6329 | Get_Decoded_Name_String (Chars (Body_Id)); | |
6330 | ||
6331 | if LSN /= null then | |
6332 | if Subprogram_Name_Greater | |
6333 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
6334 | then | |
6335 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
6336 | end if; | |
6337 | ||
6338 | Free (LSN); | |
6339 | end if; | |
6340 | ||
6341 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
6342 | end; | |
6343 | end if; | |
6344 | end Check_Subprogram_Order; | |
6345 | ||
6346 | ------------------------------ | |
6347 | -- Check_Subtype_Conformant -- | |
6348 | ------------------------------ | |
6349 | ||
6350 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
6351 | (New_Id : Entity_Id; |
6352 | Old_Id : Entity_Id; | |
6353 | Err_Loc : Node_Id := Empty; | |
f307415a AC |
6354 | Skip_Controlling_Formals : Boolean := False; |
6355 | Get_Inst : Boolean := False) | |
996ae0b0 RK |
6356 | is |
6357 | Result : Boolean; | |
81db9d77 | 6358 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6359 | begin |
6360 | Check_Conformance | |
ce2b6ba5 | 6361 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
f307415a AC |
6362 | Skip_Controlling_Formals => Skip_Controlling_Formals, |
6363 | Get_Inst => Get_Inst); | |
996ae0b0 RK |
6364 | end Check_Subtype_Conformant; |
6365 | ||
6366 | --------------------------- | |
6367 | -- Check_Type_Conformant -- | |
6368 | --------------------------- | |
6369 | ||
6370 | procedure Check_Type_Conformant | |
6371 | (New_Id : Entity_Id; | |
6372 | Old_Id : Entity_Id; | |
6373 | Err_Loc : Node_Id := Empty) | |
6374 | is | |
6375 | Result : Boolean; | |
81db9d77 | 6376 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6377 | begin |
6378 | Check_Conformance | |
6379 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
6380 | end Check_Type_Conformant; | |
6381 | ||
806f6d37 AC |
6382 | --------------------------- |
6383 | -- Can_Override_Operator -- | |
6384 | --------------------------- | |
6385 | ||
6386 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
6387 | Typ : Entity_Id; | |
f146302c | 6388 | |
806f6d37 AC |
6389 | begin |
6390 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
6391 | return False; | |
6392 | ||
6393 | else | |
6394 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
6395 | ||
f146302c AC |
6396 | -- Check explicitly that the operation is a primitive of the type |
6397 | ||
806f6d37 | 6398 | return Operator_Matches_Spec (Subp, Subp) |
f146302c | 6399 | and then not Is_Generic_Type (Typ) |
806f6d37 AC |
6400 | and then Scope (Subp) = Scope (Typ) |
6401 | and then not Is_Class_Wide_Type (Typ); | |
6402 | end if; | |
6403 | end Can_Override_Operator; | |
6404 | ||
996ae0b0 RK |
6405 | ---------------------- |
6406 | -- Conforming_Types -- | |
6407 | ---------------------- | |
6408 | ||
6409 | function Conforming_Types | |
6410 | (T1 : Entity_Id; | |
6411 | T2 : Entity_Id; | |
6412 | Ctype : Conformance_Type; | |
d05ef0ab | 6413 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
6414 | is |
6415 | Type_1 : Entity_Id := T1; | |
6416 | Type_2 : Entity_Id := T2; | |
af4b9434 | 6417 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
6418 | |
6419 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
6420 | -- If neither T1 nor T2 are generic actual types, or if they are in |
6421 | -- different scopes (e.g. parent and child instances), then verify that | |
6422 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
6423 | -- subtype chain. The whole purpose of this procedure is to prevent | |
6424 | -- spurious ambiguities in an instantiation that may arise if two | |
6425 | -- distinct generic types are instantiated with the same actual. | |
6426 | ||
5d37ba92 ES |
6427 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
6428 | -- An access parameter can designate an incomplete type. If the | |
6429 | -- incomplete type is the limited view of a type from a limited_ | |
6430 | -- with_clause, check whether the non-limited view is available. If | |
6431 | -- it is a (non-limited) incomplete type, get the full view. | |
6432 | ||
0a36105d JM |
6433 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
6434 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
6435 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
6436 | -- with view of a type is used in a subprogram declaration and the | |
6437 | -- subprogram body is in the scope of a regular with clause for the | |
6438 | -- same unit. In such a case, the two type entities can be considered | |
6439 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
6440 | |
6441 | ---------------------- | |
6442 | -- Base_Types_Match -- | |
6443 | ---------------------- | |
6444 | ||
6445 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
8fde064e AC |
6446 | BT1 : constant Entity_Id := Base_Type (T1); |
6447 | BT2 : constant Entity_Id := Base_Type (T2); | |
6448 | ||
996ae0b0 RK |
6449 | begin |
6450 | if T1 = T2 then | |
6451 | return True; | |
6452 | ||
8fde064e | 6453 | elsif BT1 = BT2 then |
996ae0b0 | 6454 | |
0a36105d | 6455 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
6456 | -- check that the generic actual is an ancestor subtype of the |
6457 | -- other ???. | |
586ecbf3 | 6458 | |
70f4ad20 AC |
6459 | -- See code in Find_Corresponding_Spec that applies an additional |
6460 | -- filter to handle accidental amiguities in instances. | |
996ae0b0 RK |
6461 | |
6462 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
6463 | or else not Is_Generic_Actual_Type (T2) |
6464 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 6465 | |
8fde064e | 6466 | -- If T2 is a generic actual type it is declared as the subtype of |
2995860f AC |
6467 | -- the actual. If that actual is itself a subtype we need to use its |
6468 | -- own base type to check for compatibility. | |
8fde064e AC |
6469 | |
6470 | elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then | |
6471 | return True; | |
6472 | ||
6473 | elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then | |
6474 | return True; | |
6475 | ||
0a36105d JM |
6476 | else |
6477 | return False; | |
6478 | end if; | |
6479 | end Base_Types_Match; | |
aa720a54 | 6480 | |
5d37ba92 ES |
6481 | -------------------------- |
6482 | -- Find_Designated_Type -- | |
6483 | -------------------------- | |
6484 | ||
6485 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
6486 | Desig : Entity_Id; | |
6487 | ||
6488 | begin | |
6489 | Desig := Directly_Designated_Type (T); | |
6490 | ||
6491 | if Ekind (Desig) = E_Incomplete_Type then | |
6492 | ||
6493 | -- If regular incomplete type, get full view if available | |
6494 | ||
6495 | if Present (Full_View (Desig)) then | |
6496 | Desig := Full_View (Desig); | |
6497 | ||
6498 | -- If limited view of a type, get non-limited view if available, | |
6499 | -- and check again for a regular incomplete type. | |
6500 | ||
6501 | elsif Present (Non_Limited_View (Desig)) then | |
6502 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
6503 | end if; | |
6504 | end if; | |
6505 | ||
6506 | return Desig; | |
6507 | end Find_Designated_Type; | |
6508 | ||
0a36105d JM |
6509 | ------------------------------- |
6510 | -- Matches_Limited_With_View -- | |
6511 | ------------------------------- | |
6512 | ||
6513 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
6514 | begin | |
6515 | -- In some cases a type imported through a limited_with clause, and | |
6516 | -- its nonlimited view are both visible, for example in an anonymous | |
28fa5430 AC |
6517 | -- access-to-class-wide type in a formal, or when building the body |
6518 | -- for a subprogram renaming after the subprogram has been frozen. | |
6519 | -- In these cases Both entities designate the same type. In addition, | |
6520 | -- if one of them is an actual in an instance, it may be a subtype of | |
6521 | -- the non-limited view of the other. | |
6522 | ||
6523 | if From_Limited_With (T1) | |
6524 | and then (T2 = Available_View (T1) | |
6525 | or else Is_Subtype_Of (T2, Available_View (T1))) | |
6526 | then | |
aa720a54 AC |
6527 | return True; |
6528 | ||
28fa5430 AC |
6529 | elsif From_Limited_With (T2) |
6530 | and then (T1 = Available_View (T2) | |
6531 | or else Is_Subtype_Of (T1, Available_View (T2))) | |
6532 | then | |
41251c60 | 6533 | return True; |
3e24afaa | 6534 | |
7b56a91b AC |
6535 | elsif From_Limited_With (T1) |
6536 | and then From_Limited_With (T2) | |
3e24afaa AC |
6537 | and then Available_View (T1) = Available_View (T2) |
6538 | then | |
6539 | return True; | |
41251c60 | 6540 | |
996ae0b0 RK |
6541 | else |
6542 | return False; | |
6543 | end if; | |
0a36105d | 6544 | end Matches_Limited_With_View; |
996ae0b0 | 6545 | |
ec4867fa | 6546 | -- Start of processing for Conforming_Types |
758c442c | 6547 | |
996ae0b0 | 6548 | begin |
8fde064e AC |
6549 | -- The context is an instance association for a formal access-to- |
6550 | -- subprogram type; the formal parameter types require mapping because | |
6551 | -- they may denote other formal parameters of the generic unit. | |
996ae0b0 RK |
6552 | |
6553 | if Get_Inst then | |
6554 | Type_1 := Get_Instance_Of (T1); | |
6555 | Type_2 := Get_Instance_Of (T2); | |
6556 | end if; | |
6557 | ||
0a36105d JM |
6558 | -- If one of the types is a view of the other introduced by a limited |
6559 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 6560 | |
0a36105d JM |
6561 | if Matches_Limited_With_View (T1, T2) then |
6562 | return True; | |
6563 | ||
6564 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
6565 | return Ctype <= Mode_Conformant |
6566 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
6567 | ||
6568 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
6569 | and then Present (Full_View (Type_1)) | |
6570 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
6571 | then | |
6572 | return Ctype <= Mode_Conformant | |
6573 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
6574 | ||
6575 | elsif Ekind (Type_2) = E_Incomplete_Type | |
6576 | and then Present (Full_View (Type_2)) | |
6577 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6578 | then | |
6579 | return Ctype <= Mode_Conformant | |
6580 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
6581 | |
6582 | elsif Is_Private_Type (Type_2) | |
6583 | and then In_Instance | |
6584 | and then Present (Full_View (Type_2)) | |
6585 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6586 | then | |
6587 | return Ctype <= Mode_Conformant | |
6588 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
167b47d9 | 6589 | |
088c7e1b | 6590 | -- In Ada 2012, incomplete types (including limited views) can appear |
167b47d9 AC |
6591 | -- as actuals in instantiations. |
6592 | ||
6593 | elsif Is_Incomplete_Type (Type_1) | |
6594 | and then Is_Incomplete_Type (Type_2) | |
6595 | and then (Used_As_Generic_Actual (Type_1) | |
6596 | or else Used_As_Generic_Actual (Type_2)) | |
6597 | then | |
6598 | return True; | |
996ae0b0 RK |
6599 | end if; |
6600 | ||
0a36105d | 6601 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
466c2127 AC |
6602 | -- treated recursively because they carry a signature. As far as |
6603 | -- conformance is concerned, convention plays no role, and either | |
6604 | -- or both could be access to protected subprograms. | |
af4b9434 AC |
6605 | |
6606 | Are_Anonymous_Access_To_Subprogram_Types := | |
466c2127 AC |
6607 | Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
6608 | E_Anonymous_Access_Protected_Subprogram_Type) | |
f937473f | 6609 | and then |
466c2127 AC |
6610 | Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
6611 | E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 6612 | |
996ae0b0 | 6613 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
6614 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
6615 | -- the base types because we may have built internal subtype entities | |
6616 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 6617 | |
5d37ba92 ES |
6618 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
6619 | and then | |
6620 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
8fde064e AC |
6621 | |
6622 | -- Ada 2005 (AI-254) | |
6623 | ||
6624 | or else Are_Anonymous_Access_To_Subprogram_Types | |
996ae0b0 RK |
6625 | then |
6626 | declare | |
6627 | Desig_1 : Entity_Id; | |
6628 | Desig_2 : Entity_Id; | |
6629 | ||
6630 | begin | |
885c4871 | 6631 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 6632 | -- subtype conformance. |
9dcb52e1 | 6633 | |
0791fbe9 | 6634 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
6635 | and then Ctype >= Subtype_Conformant |
6636 | and then | |
6637 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
6638 | then | |
6639 | return False; | |
996ae0b0 RK |
6640 | end if; |
6641 | ||
5d37ba92 | 6642 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 6643 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 6644 | |
5d37ba92 | 6645 | -- If the context is an instance association for a formal |
82c80734 RD |
6646 | -- access-to-subprogram type; formal access parameter designated |
6647 | -- types require mapping because they may denote other formal | |
6648 | -- parameters of the generic unit. | |
996ae0b0 RK |
6649 | |
6650 | if Get_Inst then | |
6651 | Desig_1 := Get_Instance_Of (Desig_1); | |
6652 | Desig_2 := Get_Instance_Of (Desig_2); | |
6653 | end if; | |
6654 | ||
82c80734 RD |
6655 | -- It is possible for a Class_Wide_Type to be introduced for an |
6656 | -- incomplete type, in which case there is a separate class_ wide | |
6657 | -- type for the full view. The types conform if their Etypes | |
6658 | -- conform, i.e. one may be the full view of the other. This can | |
6659 | -- only happen in the context of an access parameter, other uses | |
6660 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 6661 | |
fbf5a39b | 6662 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
6663 | and then |
6664 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
6665 | then |
6666 | return | |
fbf5a39b AC |
6667 | Conforming_Types |
6668 | (Etype (Base_Type (Desig_1)), | |
6669 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
6670 | |
6671 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 6672 | if Ada_Version < Ada_2005 then |
758c442c GD |
6673 | return Ctype = Type_Conformant |
6674 | or else | |
af4b9434 AC |
6675 | Subtypes_Statically_Match (Desig_1, Desig_2); |
6676 | ||
758c442c GD |
6677 | -- We must check the conformance of the signatures themselves |
6678 | ||
6679 | else | |
6680 | declare | |
6681 | Conformant : Boolean; | |
6682 | begin | |
6683 | Check_Conformance | |
6684 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
6685 | return Conformant; | |
6686 | end; | |
6687 | end if; | |
6688 | ||
167b47d9 AC |
6689 | -- A limited view of an actual matches the corresponding |
6690 | -- incomplete formal. | |
6691 | ||
6692 | elsif Ekind (Desig_2) = E_Incomplete_Subtype | |
6693 | and then From_Limited_With (Desig_2) | |
6694 | and then Used_As_Generic_Actual (Etype (Desig_2)) | |
6695 | then | |
6696 | return True; | |
6697 | ||
996ae0b0 RK |
6698 | else |
6699 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
6700 | and then (Ctype = Type_Conformant | |
8fde064e AC |
6701 | or else |
6702 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
6703 | end if; |
6704 | end; | |
6705 | ||
6706 | -- Otherwise definitely no match | |
6707 | ||
6708 | else | |
c8ef728f ES |
6709 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
6710 | and then Is_Access_Type (Type_2)) | |
6711 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
8fde064e | 6712 | and then Is_Access_Type (Type_1))) |
c8ef728f ES |
6713 | and then |
6714 | Conforming_Types | |
6715 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
6716 | then | |
6717 | May_Hide_Profile := True; | |
6718 | end if; | |
6719 | ||
996ae0b0 RK |
6720 | return False; |
6721 | end if; | |
996ae0b0 RK |
6722 | end Conforming_Types; |
6723 | ||
6724 | -------------------------- | |
6725 | -- Create_Extra_Formals -- | |
6726 | -------------------------- | |
6727 | ||
6728 | procedure Create_Extra_Formals (E : Entity_Id) is | |
6729 | Formal : Entity_Id; | |
ec4867fa | 6730 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
6731 | Last_Extra : Entity_Id; |
6732 | Formal_Type : Entity_Id; | |
6733 | P_Formal : Entity_Id := Empty; | |
6734 | ||
ec4867fa ES |
6735 | function Add_Extra_Formal |
6736 | (Assoc_Entity : Entity_Id; | |
6737 | Typ : Entity_Id; | |
6738 | Scope : Entity_Id; | |
6739 | Suffix : String) return Entity_Id; | |
6740 | -- Add an extra formal to the current list of formals and extra formals. | |
6741 | -- The extra formal is added to the end of the list of extra formals, | |
6742 | -- and also returned as the result. These formals are always of mode IN. | |
6743 | -- The new formal has the type Typ, is declared in Scope, and its name | |
6744 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
6745 | -- The following suffixes are currently used. They should not be changed |
6746 | -- without coordinating with CodePeer, which makes use of these to | |
6747 | -- provide better messages. | |
6748 | ||
d92eccc3 AC |
6749 | -- O denotes the Constrained bit. |
6750 | -- L denotes the accessibility level. | |
cd5a9750 AC |
6751 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
6752 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 6753 | |
fbf5a39b AC |
6754 | ---------------------- |
6755 | -- Add_Extra_Formal -- | |
6756 | ---------------------- | |
6757 | ||
ec4867fa ES |
6758 | function Add_Extra_Formal |
6759 | (Assoc_Entity : Entity_Id; | |
6760 | Typ : Entity_Id; | |
6761 | Scope : Entity_Id; | |
6762 | Suffix : String) return Entity_Id | |
6763 | is | |
996ae0b0 | 6764 | EF : constant Entity_Id := |
ec4867fa ES |
6765 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
6766 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 6767 | Suffix => Suffix)); |
996ae0b0 RK |
6768 | |
6769 | begin | |
82c80734 RD |
6770 | -- A little optimization. Never generate an extra formal for the |
6771 | -- _init operand of an initialization procedure, since it could | |
6772 | -- never be used. | |
996ae0b0 RK |
6773 | |
6774 | if Chars (Formal) = Name_uInit then | |
6775 | return Empty; | |
6776 | end if; | |
6777 | ||
6778 | Set_Ekind (EF, E_In_Parameter); | |
6779 | Set_Actual_Subtype (EF, Typ); | |
6780 | Set_Etype (EF, Typ); | |
ec4867fa | 6781 | Set_Scope (EF, Scope); |
996ae0b0 RK |
6782 | Set_Mechanism (EF, Default_Mechanism); |
6783 | Set_Formal_Validity (EF); | |
6784 | ||
ec4867fa ES |
6785 | if No (First_Extra) then |
6786 | First_Extra := EF; | |
6787 | Set_Extra_Formals (Scope, First_Extra); | |
6788 | end if; | |
6789 | ||
6790 | if Present (Last_Extra) then | |
6791 | Set_Extra_Formal (Last_Extra, EF); | |
6792 | end if; | |
6793 | ||
996ae0b0 | 6794 | Last_Extra := EF; |
ec4867fa | 6795 | |
996ae0b0 RK |
6796 | return EF; |
6797 | end Add_Extra_Formal; | |
6798 | ||
6799 | -- Start of processing for Create_Extra_Formals | |
6800 | ||
6801 | begin | |
8fde064e AC |
6802 | -- We never generate extra formals if expansion is not active because we |
6803 | -- don't need them unless we are generating code. | |
f937473f RD |
6804 | |
6805 | if not Expander_Active then | |
6806 | return; | |
6807 | end if; | |
6808 | ||
e2441021 AC |
6809 | -- No need to generate extra formals in interface thunks whose target |
6810 | -- primitive has no extra formals. | |
6811 | ||
6812 | if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then | |
6813 | return; | |
6814 | end if; | |
6815 | ||
82c80734 | 6816 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 6817 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 6818 | -- for extra formals. |
996ae0b0 RK |
6819 | |
6820 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
6821 | P_Formal := First_Formal (Alias (E)); | |
6822 | end if; | |
6823 | ||
6824 | Last_Extra := Empty; | |
6825 | Formal := First_Formal (E); | |
6826 | while Present (Formal) loop | |
6827 | Last_Extra := Formal; | |
6828 | Next_Formal (Formal); | |
6829 | end loop; | |
6830 | ||
f937473f | 6831 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
6832 | -- situation may arise for subprogram types created as part of |
6833 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 | 6834 | |
8fde064e | 6835 | if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
996ae0b0 RK |
6836 | return; |
6837 | end if; | |
6838 | ||
19590d70 GD |
6839 | -- If the subprogram is a predefined dispatching subprogram then don't |
6840 | -- generate any extra constrained or accessibility level formals. In | |
6841 | -- general we suppress these for internal subprograms (by not calling | |
6842 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
6843 | -- generated stream attributes do get passed through because extra | |
6844 | -- build-in-place formals are needed in some cases (limited 'Input). | |
6845 | ||
bac7206d | 6846 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 6847 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
6848 | end if; |
6849 | ||
996ae0b0 | 6850 | Formal := First_Formal (E); |
996ae0b0 RK |
6851 | while Present (Formal) loop |
6852 | ||
6853 | -- Create extra formal for supporting the attribute 'Constrained. | |
6854 | -- The case of a private type view without discriminants also | |
6855 | -- requires the extra formal if the underlying type has defaulted | |
6856 | -- discriminants. | |
6857 | ||
6858 | if Ekind (Formal) /= E_In_Parameter then | |
6859 | if Present (P_Formal) then | |
6860 | Formal_Type := Etype (P_Formal); | |
6861 | else | |
6862 | Formal_Type := Etype (Formal); | |
6863 | end if; | |
6864 | ||
5d09245e AC |
6865 | -- Do not produce extra formals for Unchecked_Union parameters. |
6866 | -- Jump directly to the end of the loop. | |
6867 | ||
6868 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
6869 | goto Skip_Extra_Formal_Generation; | |
6870 | end if; | |
6871 | ||
996ae0b0 RK |
6872 | if not Has_Discriminants (Formal_Type) |
6873 | and then Ekind (Formal_Type) in Private_Kind | |
6874 | and then Present (Underlying_Type (Formal_Type)) | |
6875 | then | |
6876 | Formal_Type := Underlying_Type (Formal_Type); | |
6877 | end if; | |
6878 | ||
5e5db3b4 GD |
6879 | -- Suppress the extra formal if formal's subtype is constrained or |
6880 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
6881 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
6882 | -- can have defaulted discriminants, but 'Constrained is required | |
6883 | -- to return True, so the formal is never needed (see AI05-0214). | |
6884 | -- Note that this ensures consistency of calling sequences for | |
6885 | -- dispatching operations when some types in a class have defaults | |
6886 | -- on discriminants and others do not (and requiring the extra | |
6887 | -- formal would introduce distributed overhead). | |
6888 | ||
b5bdffcc AC |
6889 | -- If the type does not have a completion yet, treat as prior to |
6890 | -- Ada 2012 for consistency. | |
6891 | ||
996ae0b0 | 6892 | if Has_Discriminants (Formal_Type) |
f937473f | 6893 | and then not Is_Constrained (Formal_Type) |
83496138 | 6894 | and then Is_Definite_Subtype (Formal_Type) |
5e5db3b4 | 6895 | and then (Ada_Version < Ada_2012 |
b5bdffcc AC |
6896 | or else No (Underlying_Type (Formal_Type)) |
6897 | or else not | |
6898 | (Is_Limited_Type (Formal_Type) | |
6899 | and then | |
6900 | (Is_Tagged_Type | |
6901 | (Underlying_Type (Formal_Type))))) | |
996ae0b0 RK |
6902 | then |
6903 | Set_Extra_Constrained | |
d92eccc3 | 6904 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
6905 | end if; |
6906 | end if; | |
6907 | ||
0a36105d JM |
6908 | -- Create extra formal for supporting accessibility checking. This |
6909 | -- is done for both anonymous access formals and formals of named | |
6910 | -- access types that are marked as controlling formals. The latter | |
6911 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
6912 | -- type and substitutes the types of access-to-class-wide actuals | |
6913 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
6914 | -- Base_Type is applied because in cases where there is a null |
6915 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
6916 | |
6917 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 6918 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
6919 | -- package in which it resides. However, we do not suppress it |
6920 | -- simply if the scope has accessibility checks suppressed, since | |
6921 | -- this could cause trouble when clients are compiled with a | |
6922 | -- different suppression setting. The explicit checks at the | |
6923 | -- package level are safe from this point of view. | |
996ae0b0 | 6924 | |
5d37ba92 | 6925 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 6926 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 6927 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 6928 | and then not |
fbf5a39b | 6929 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 6930 | or else |
fbf5a39b | 6931 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 6932 | and then |
c8ef728f | 6933 | (No (P_Formal) |
996ae0b0 RK |
6934 | or else Present (Extra_Accessibility (P_Formal))) |
6935 | then | |
811c6a85 | 6936 | Set_Extra_Accessibility |
d92eccc3 | 6937 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
6938 | end if; |
6939 | ||
5d09245e AC |
6940 | -- This label is required when skipping extra formal generation for |
6941 | -- Unchecked_Union parameters. | |
6942 | ||
6943 | <<Skip_Extra_Formal_Generation>> | |
6944 | ||
f937473f RD |
6945 | if Present (P_Formal) then |
6946 | Next_Formal (P_Formal); | |
6947 | end if; | |
6948 | ||
996ae0b0 RK |
6949 | Next_Formal (Formal); |
6950 | end loop; | |
ec4867fa | 6951 | |
63585f75 SB |
6952 | <<Test_For_Func_Result_Extras>> |
6953 | ||
6954 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
6955 | -- function call is ... determined by the point of call ...". | |
6956 | ||
6957 | if Needs_Result_Accessibility_Level (E) then | |
6958 | Set_Extra_Accessibility_Of_Result | |
6959 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
6960 | end if; | |
19590d70 | 6961 | |
ec4867fa | 6962 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
6963 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
6964 | ||
0791fbe9 | 6965 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 6966 | declare |
f937473f | 6967 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 6968 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 6969 | Formal_Typ : Entity_Id; |
f937473f | 6970 | |
2fcc44fa | 6971 | Discard : Entity_Id; |
f937473f | 6972 | pragma Warnings (Off, Discard); |
ec4867fa ES |
6973 | |
6974 | begin | |
f937473f | 6975 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
6976 | -- add a 4-state formal indicating whether the return object is |
6977 | -- allocated by the caller (1), or should be allocated by the | |
6978 | -- callee on the secondary stack (2), in the global heap (3), or | |
6979 | -- in a user-defined storage pool (4). For the moment we just use | |
6980 | -- Natural for the type of this formal. Note that this formal | |
6981 | -- isn't usually needed in the case where the result subtype is | |
6982 | -- constrained, but it is needed when the function has a tagged | |
6983 | -- result, because generally such functions can be called in a | |
6984 | -- dispatching context and such calls must be handled like calls | |
6985 | -- to a class-wide function. | |
0a36105d | 6986 | |
1bb6e262 | 6987 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
6988 | Discard := |
6989 | Add_Extra_Formal | |
6990 | (E, Standard_Natural, | |
6991 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 6992 | |
8417f4b2 | 6993 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 AC |
6994 | -- use a user-defined pool. This formal is not added on |
6995 | -- .NET/JVM/ZFP as those targets do not support pools. | |
200b7162 | 6996 | |
ea10ca9c AC |
6997 | if VM_Target = No_VM |
6998 | and then RTE_Available (RE_Root_Storage_Pool_Ptr) | |
3e452820 | 6999 | then |
8417f4b2 AC |
7000 | Discard := |
7001 | Add_Extra_Formal | |
7002 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
7003 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
7004 | end if; | |
f937473f | 7005 | end if; |
ec4867fa | 7006 | |
df3e68b1 | 7007 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 7008 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 7009 | |
ca5af305 | 7010 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
7011 | Discard := |
7012 | Add_Extra_Formal | |
ca5af305 AC |
7013 | (E, RTE (RE_Finalization_Master_Ptr), |
7014 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
7015 | end if; |
7016 | ||
94bbf008 AC |
7017 | -- When the result type contains tasks, add two extra formals: the |
7018 | -- master of the tasks to be created, and the caller's activation | |
7019 | -- chain. | |
f937473f | 7020 | |
1a36a0cd | 7021 | if Has_Task (Full_Subt) then |
f937473f RD |
7022 | Discard := |
7023 | Add_Extra_Formal | |
7024 | (E, RTE (RE_Master_Id), | |
af89615f | 7025 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
7026 | Discard := |
7027 | Add_Extra_Formal | |
7028 | (E, RTE (RE_Activation_Chain_Access), | |
7029 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
7030 | end if; | |
ec4867fa | 7031 | |
f937473f RD |
7032 | -- All build-in-place functions get an extra formal that will be |
7033 | -- passed the address of the return object within the caller. | |
ec4867fa | 7034 | |
1a36a0cd AC |
7035 | Formal_Typ := |
7036 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 7037 | |
1a36a0cd AC |
7038 | Set_Directly_Designated_Type (Formal_Typ, Result_Subt); |
7039 | Set_Etype (Formal_Typ, Formal_Typ); | |
7040 | Set_Depends_On_Private | |
7041 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
7042 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
7043 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 7044 | |
1a36a0cd AC |
7045 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
7046 | -- the designated type comes from the limited view (for back-end | |
7047 | -- purposes). | |
ec4867fa | 7048 | |
7b56a91b AC |
7049 | Set_From_Limited_With |
7050 | (Formal_Typ, From_Limited_With (Result_Subt)); | |
f937473f | 7051 | |
1a36a0cd AC |
7052 | Layout_Type (Formal_Typ); |
7053 | ||
7054 | Discard := | |
7055 | Add_Extra_Formal | |
7056 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
7057 | end; |
7058 | end if; | |
996ae0b0 RK |
7059 | end Create_Extra_Formals; |
7060 | ||
7061 | ----------------------------- | |
7062 | -- Enter_Overloaded_Entity -- | |
7063 | ----------------------------- | |
7064 | ||
7065 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
7066 | E : Entity_Id := Current_Entity_In_Scope (S); | |
7067 | C_E : Entity_Id := Current_Entity (S); | |
7068 | ||
7069 | begin | |
7070 | if Present (E) then | |
7071 | Set_Has_Homonym (E); | |
7072 | Set_Has_Homonym (S); | |
7073 | end if; | |
7074 | ||
7075 | Set_Is_Immediately_Visible (S); | |
7076 | Set_Scope (S, Current_Scope); | |
7077 | ||
7078 | -- Chain new entity if front of homonym in current scope, so that | |
7079 | -- homonyms are contiguous. | |
7080 | ||
8fde064e | 7081 | if Present (E) and then E /= C_E then |
996ae0b0 RK |
7082 | while Homonym (C_E) /= E loop |
7083 | C_E := Homonym (C_E); | |
7084 | end loop; | |
7085 | ||
7086 | Set_Homonym (C_E, S); | |
7087 | ||
7088 | else | |
7089 | E := C_E; | |
7090 | Set_Current_Entity (S); | |
7091 | end if; | |
7092 | ||
7093 | Set_Homonym (S, E); | |
7094 | ||
2352eadb AC |
7095 | if Is_Inherited_Operation (S) then |
7096 | Append_Inherited_Subprogram (S); | |
7097 | else | |
7098 | Append_Entity (S, Current_Scope); | |
7099 | end if; | |
7100 | ||
996ae0b0 RK |
7101 | Set_Public_Status (S); |
7102 | ||
7103 | if Debug_Flag_E then | |
7104 | Write_Str ("New overloaded entity chain: "); | |
7105 | Write_Name (Chars (S)); | |
996ae0b0 | 7106 | |
82c80734 | 7107 | E := S; |
996ae0b0 RK |
7108 | while Present (E) loop |
7109 | Write_Str (" "); Write_Int (Int (E)); | |
7110 | E := Homonym (E); | |
7111 | end loop; | |
7112 | ||
7113 | Write_Eol; | |
7114 | end if; | |
7115 | ||
7116 | -- Generate warning for hiding | |
7117 | ||
7118 | if Warn_On_Hiding | |
7119 | and then Comes_From_Source (S) | |
7120 | and then In_Extended_Main_Source_Unit (S) | |
7121 | then | |
7122 | E := S; | |
7123 | loop | |
7124 | E := Homonym (E); | |
7125 | exit when No (E); | |
7126 | ||
7fc53871 AC |
7127 | -- Warn unless genuine overloading. Do not emit warning on |
7128 | -- hiding predefined operators in Standard (these are either an | |
7129 | -- (artifact of our implicit declarations, or simple noise) but | |
7130 | -- keep warning on a operator defined on a local subtype, because | |
7131 | -- of the real danger that different operators may be applied in | |
7132 | -- various parts of the program. | |
996ae0b0 | 7133 | |
1f250383 AC |
7134 | -- Note that if E and S have the same scope, there is never any |
7135 | -- hiding. Either the two conflict, and the program is illegal, | |
7136 | -- or S is overriding an implicit inherited subprogram. | |
7137 | ||
7138 | if Scope (E) /= Scope (S) | |
7139 | and then (not Is_Overloadable (E) | |
8d606a78 | 7140 | or else Subtype_Conformant (E, S)) |
f937473f RD |
7141 | and then (Is_Immediately_Visible (E) |
7142 | or else | |
7143 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 7144 | then |
7fc53871 AC |
7145 | if Scope (E) /= Standard_Standard then |
7146 | Error_Msg_Sloc := Sloc (E); | |
3ccedacc | 7147 | Error_Msg_N ("declaration of & hides one #?h?", S); |
7fc53871 AC |
7148 | |
7149 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
7150 | and then | |
1f250383 | 7151 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
7152 | then |
7153 | Error_Msg_N | |
dbfeb4fa | 7154 | ("declaration of & hides predefined operator?h?", S); |
7fc53871 | 7155 | end if; |
996ae0b0 RK |
7156 | end if; |
7157 | end loop; | |
7158 | end if; | |
7159 | end Enter_Overloaded_Entity; | |
7160 | ||
e5a58fac AC |
7161 | ----------------------------- |
7162 | -- Check_Untagged_Equality -- | |
7163 | ----------------------------- | |
7164 | ||
7165 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
7166 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
7167 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
7168 | Obj_Decl : Node_Id; | |
7169 | ||
7170 | begin | |
7c0c194b AC |
7171 | -- This check applies only if we have a subprogram declaration with an |
7172 | -- untagged record type. | |
b2834fbd AC |
7173 | |
7174 | if Nkind (Decl) /= N_Subprogram_Declaration | |
7175 | or else not Is_Record_Type (Typ) | |
7176 | or else Is_Tagged_Type (Typ) | |
e5a58fac | 7177 | then |
b2834fbd AC |
7178 | return; |
7179 | end if; | |
e5a58fac | 7180 | |
b2834fbd AC |
7181 | -- In Ada 2012 case, we will output errors or warnings depending on |
7182 | -- the setting of debug flag -gnatd.E. | |
7183 | ||
7184 | if Ada_Version >= Ada_2012 then | |
7185 | Error_Msg_Warn := Debug_Flag_Dot_EE; | |
7186 | ||
7187 | -- In earlier versions of Ada, nothing to do unless we are warning on | |
7188 | -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). | |
7189 | ||
7190 | else | |
7191 | if not Warn_On_Ada_2012_Compatibility then | |
7192 | return; | |
7193 | end if; | |
7194 | end if; | |
7195 | ||
7196 | -- Cases where the type has already been frozen | |
e5a58fac | 7197 | |
b2834fbd AC |
7198 | if Is_Frozen (Typ) then |
7199 | ||
7200 | -- If the type is not declared in a package, or if we are in the body | |
7201 | -- of the package or in some other scope, the new operation is not | |
7202 | -- primitive, and therefore legal, though suspicious. Should we | |
7203 | -- generate a warning in this case ??? | |
7204 | ||
7205 | if Ekind (Scope (Typ)) /= E_Package | |
7206 | or else Scope (Typ) /= Current_Scope | |
7207 | then | |
7208 | return; | |
7209 | ||
7210 | -- If the type is a generic actual (sub)type, the operation is not | |
7211 | -- primitive either because the base type is declared elsewhere. | |
7212 | ||
7213 | elsif Is_Generic_Actual_Type (Typ) then | |
7214 | return; | |
7215 | ||
7216 | -- Here we have a definite error of declaration after freezing | |
7217 | ||
7218 | else | |
7219 | if Ada_Version >= Ada_2012 then | |
ae6ede77 | 7220 | Error_Msg_NE |
3ccedacc | 7221 | ("equality operator must be declared before type & is " |
b2834fbd AC |
7222 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); |
7223 | ||
7224 | -- In Ada 2012 mode with error turned to warning, output one | |
7225 | -- more warning to warn that the equality operation may not | |
7226 | -- compose. This is the consequence of ignoring the error. | |
7227 | ||
7228 | if Error_Msg_Warn then | |
7229 | Error_Msg_N ("\equality operation may not compose??", Eq_Op); | |
7230 | end if; | |
21a5b575 AC |
7231 | |
7232 | else | |
7233 | Error_Msg_NE | |
b2834fbd AC |
7234 | ("equality operator must be declared before type& is " |
7235 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); | |
7236 | end if; | |
7237 | ||
7238 | -- If we are in the package body, we could just move the | |
7239 | -- declaration to the package spec, so add a message saying that. | |
7240 | ||
7241 | if In_Package_Body (Scope (Typ)) then | |
7242 | if Ada_Version >= Ada_2012 then | |
7243 | Error_Msg_N | |
7244 | ("\move declaration to package spec<<", Eq_Op); | |
7245 | else | |
7246 | Error_Msg_N | |
7247 | ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); | |
7248 | end if; | |
21a5b575 | 7249 | |
b2834fbd AC |
7250 | -- Otherwise try to find the freezing point |
7251 | ||
7252 | else | |
21a5b575 | 7253 | Obj_Decl := Next (Parent (Typ)); |
dbfeb4fa | 7254 | while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
21a5b575 AC |
7255 | if Nkind (Obj_Decl) = N_Object_Declaration |
7256 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
7257 | then | |
b2834fbd AC |
7258 | -- Freezing point, output warnings |
7259 | ||
7260 | if Ada_Version >= Ada_2012 then | |
7261 | Error_Msg_NE | |
7262 | ("type& is frozen by declaration??", Obj_Decl, Typ); | |
7263 | Error_Msg_N | |
7264 | ("\an equality operator cannot be declared after " | |
7265 | & "this point??", | |
7266 | Obj_Decl); | |
7267 | else | |
7268 | Error_Msg_NE | |
7269 | ("type& is frozen by declaration (Ada 2012)?y?", | |
7270 | Obj_Decl, Typ); | |
7271 | Error_Msg_N | |
7272 | ("\an equality operator cannot be declared after " | |
7273 | & "this point (Ada 2012)?y?", | |
7274 | Obj_Decl); | |
7275 | end if; | |
7276 | ||
21a5b575 AC |
7277 | exit; |
7278 | end if; | |
7279 | ||
7280 | Next (Obj_Decl); | |
7281 | end loop; | |
7282 | end if; | |
b2834fbd | 7283 | end if; |
e5a58fac | 7284 | |
b2834fbd AC |
7285 | -- Here if type is not frozen yet. It is illegal to have a primitive |
7286 | -- equality declared in the private part if the type is visible. | |
21a5b575 | 7287 | |
b2834fbd AC |
7288 | elsif not In_Same_List (Parent (Typ), Decl) |
7289 | and then not Is_Limited_Type (Typ) | |
7290 | then | |
7291 | -- Shouldn't we give an RM reference here??? | |
21a5b575 | 7292 | |
b2834fbd AC |
7293 | if Ada_Version >= Ada_2012 then |
7294 | Error_Msg_N | |
7295 | ("equality operator appears too late<<", Eq_Op); | |
7296 | else | |
7297 | Error_Msg_N | |
7298 | ("equality operator appears too late (Ada 2012)?y?", Eq_Op); | |
e5a58fac | 7299 | end if; |
b2834fbd AC |
7300 | |
7301 | -- No error detected | |
7302 | ||
7303 | else | |
7304 | return; | |
e5a58fac AC |
7305 | end if; |
7306 | end Check_Untagged_Equality; | |
7307 | ||
996ae0b0 RK |
7308 | ----------------------------- |
7309 | -- Find_Corresponding_Spec -- | |
7310 | ----------------------------- | |
7311 | ||
d44202ba HK |
7312 | function Find_Corresponding_Spec |
7313 | (N : Node_Id; | |
7314 | Post_Error : Boolean := True) return Entity_Id | |
7315 | is | |
996ae0b0 RK |
7316 | Spec : constant Node_Id := Specification (N); |
7317 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
7318 | ||
7319 | E : Entity_Id; | |
7320 | ||
70f4ad20 AC |
7321 | function Different_Generic_Profile (E : Entity_Id) return Boolean; |
7322 | -- Even if fully conformant, a body may depend on a generic actual when | |
7323 | -- the spec does not, or vice versa, in which case they were distinct | |
7324 | -- entities in the generic. | |
7325 | ||
7326 | ------------------------------- | |
7327 | -- Different_Generic_Profile -- | |
7328 | ------------------------------- | |
7329 | ||
7330 | function Different_Generic_Profile (E : Entity_Id) return Boolean is | |
7331 | F1, F2 : Entity_Id; | |
7332 | ||
2995860f AC |
7333 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
7334 | -- Check that the types of corresponding formals have the same | |
7335 | -- generic actual if any. We have to account for subtypes of a | |
7336 | -- generic formal, declared between a spec and a body, which may | |
73999267 AC |
7337 | -- appear distinct in an instance but matched in the generic, and |
7338 | -- the subtype may be used either in the spec or the body of the | |
7339 | -- subprogram being checked. | |
2995860f AC |
7340 | |
7341 | ------------------------- | |
7342 | -- Same_Generic_Actual -- | |
7343 | ------------------------- | |
7344 | ||
7345 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is | |
73999267 AC |
7346 | |
7347 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean; | |
7348 | -- Predicate to check whether S1 is a subtype of S2 in the source | |
7349 | -- of the instance. | |
7350 | ||
7351 | ------------------------- | |
7352 | -- Is_Declared_Subtype -- | |
7353 | ------------------------- | |
7354 | ||
7355 | function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean is | |
7356 | begin | |
7357 | return Comes_From_Source (Parent (S1)) | |
7358 | and then Nkind (Parent (S1)) = N_Subtype_Declaration | |
7359 | and then Is_Entity_Name (Subtype_Indication (Parent (S1))) | |
7360 | and then Entity (Subtype_Indication (Parent (S1))) = S2; | |
7361 | end Is_Declared_Subtype; | |
7362 | ||
7363 | -- Start of processing for Same_Generic_Actual | |
7364 | ||
2995860f AC |
7365 | begin |
7366 | return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) | |
73999267 AC |
7367 | or else Is_Declared_Subtype (T1, T2) |
7368 | or else Is_Declared_Subtype (T2, T1); | |
2995860f AC |
7369 | end Same_Generic_Actual; |
7370 | ||
7371 | -- Start of processing for Different_Generic_Profile | |
7372 | ||
70f4ad20 | 7373 | begin |
2995860f AC |
7374 | if not In_Instance then |
7375 | return False; | |
7376 | ||
7377 | elsif Ekind (E) = E_Function | |
7378 | and then not Same_Generic_Actual (Etype (E), Etype (Designator)) | |
70f4ad20 AC |
7379 | then |
7380 | return True; | |
7381 | end if; | |
7382 | ||
7383 | F1 := First_Formal (Designator); | |
7384 | F2 := First_Formal (E); | |
70f4ad20 | 7385 | while Present (F1) loop |
2995860f | 7386 | if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
70f4ad20 AC |
7387 | return True; |
7388 | end if; | |
7389 | ||
7390 | Next_Formal (F1); | |
7391 | Next_Formal (F2); | |
7392 | end loop; | |
7393 | ||
7394 | return False; | |
7395 | end Different_Generic_Profile; | |
7396 | ||
7397 | -- Start of processing for Find_Corresponding_Spec | |
7398 | ||
996ae0b0 RK |
7399 | begin |
7400 | E := Current_Entity (Designator); | |
996ae0b0 RK |
7401 | while Present (E) loop |
7402 | ||
7403 | -- We are looking for a matching spec. It must have the same scope, | |
7404 | -- and the same name, and either be type conformant, or be the case | |
7405 | -- of a library procedure spec and its body (which belong to one | |
7406 | -- another regardless of whether they are type conformant or not). | |
7407 | ||
7408 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
7409 | if Current_Scope = Standard_Standard |
7410 | or else (Ekind (E) = Ekind (Designator) | |
586ecbf3 | 7411 | and then Type_Conformant (E, Designator)) |
996ae0b0 RK |
7412 | then |
7413 | -- Within an instantiation, we know that spec and body are | |
70f4ad20 AC |
7414 | -- subtype conformant, because they were subtype conformant in |
7415 | -- the generic. We choose the subtype-conformant entity here as | |
7416 | -- well, to resolve spurious ambiguities in the instance that | |
7417 | -- were not present in the generic (i.e. when two different | |
7418 | -- types are given the same actual). If we are looking for a | |
7419 | -- spec to match a body, full conformance is expected. | |
996ae0b0 RK |
7420 | |
7421 | if In_Instance then | |
c05ba1f1 AC |
7422 | |
7423 | -- Inherit the convention and "ghostness" of the matching | |
7424 | -- spec to ensure proper full and subtype conformance. | |
7425 | ||
996ae0b0 RK |
7426 | Set_Convention (Designator, Convention (E)); |
7427 | ||
c05ba1f1 AC |
7428 | if Is_Ghost_Entity (E) then |
7429 | Set_Is_Ghost_Entity (Designator); | |
7430 | end if; | |
7431 | ||
0187b60e AC |
7432 | -- Skip past subprogram bodies and subprogram renamings that |
7433 | -- may appear to have a matching spec, but that aren't fully | |
7434 | -- conformant with it. That can occur in cases where an | |
7435 | -- actual type causes unrelated homographs in the instance. | |
7436 | ||
7437 | if Nkind_In (N, N_Subprogram_Body, | |
7438 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 7439 | and then Present (Homonym (E)) |
c7b9d548 | 7440 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
7441 | then |
7442 | goto Next_Entity; | |
7443 | ||
c7b9d548 | 7444 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 | 7445 | goto Next_Entity; |
70f4ad20 AC |
7446 | |
7447 | elsif Different_Generic_Profile (E) then | |
7448 | goto Next_Entity; | |
996ae0b0 RK |
7449 | end if; |
7450 | end if; | |
7451 | ||
25ebc085 AC |
7452 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
7453 | -- null procedures locate the internally generated spec. We | |
7454 | -- enforce mode conformance since a tagged type may inherit | |
7455 | -- from interfaces several null primitives which differ only | |
7456 | -- in the mode of the formals. | |
7457 | ||
7458 | if not (Comes_From_Source (E)) | |
7459 | and then Is_Null_Procedure (E) | |
7460 | and then not Mode_Conformant (Designator, E) | |
7461 | then | |
7462 | null; | |
7463 | ||
4d8f3296 ES |
7464 | -- For null procedures coming from source that are completions, |
7465 | -- analysis of the generated body will establish the link. | |
7466 | ||
7467 | elsif Comes_From_Source (E) | |
7468 | and then Nkind (Spec) = N_Procedure_Specification | |
7469 | and then Null_Present (Spec) | |
7470 | then | |
7471 | return E; | |
7472 | ||
25ebc085 | 7473 | elsif not Has_Completion (E) then |
996ae0b0 RK |
7474 | if Nkind (N) /= N_Subprogram_Body_Stub then |
7475 | Set_Corresponding_Spec (N, E); | |
7476 | end if; | |
7477 | ||
7478 | Set_Has_Completion (E); | |
7479 | return E; | |
7480 | ||
7481 | elsif Nkind (Parent (N)) = N_Subunit then | |
7482 | ||
7483 | -- If this is the proper body of a subunit, the completion | |
7484 | -- flag is set when analyzing the stub. | |
7485 | ||
7486 | return E; | |
7487 | ||
70f4ad20 AC |
7488 | -- If E is an internal function with a controlling result that |
7489 | -- was created for an operation inherited by a null extension, | |
7490 | -- it may be overridden by a body without a previous spec (one | |
2995860f | 7491 | -- more reason why these should be shunned). In that case we |
70f4ad20 AC |
7492 | -- remove the generated body if present, because the current |
7493 | -- one is the explicit overriding. | |
81db9d77 ES |
7494 | |
7495 | elsif Ekind (E) = E_Function | |
0791fbe9 | 7496 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
7497 | and then not Comes_From_Source (E) |
7498 | and then Has_Controlling_Result (E) | |
7499 | and then Is_Null_Extension (Etype (E)) | |
7500 | and then Comes_From_Source (Spec) | |
7501 | then | |
7502 | Set_Has_Completion (E, False); | |
7503 | ||
1366997b AC |
7504 | if Expander_Active |
7505 | and then Nkind (Parent (E)) = N_Function_Specification | |
7506 | then | |
81db9d77 ES |
7507 | Remove |
7508 | (Unit_Declaration_Node | |
1366997b AC |
7509 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
7510 | ||
81db9d77 ES |
7511 | return E; |
7512 | ||
1366997b AC |
7513 | -- If expansion is disabled, or if the wrapper function has |
7514 | -- not been generated yet, this a late body overriding an | |
7515 | -- inherited operation, or it is an overriding by some other | |
7516 | -- declaration before the controlling result is frozen. In | |
7517 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
7518 | |
7519 | else | |
7520 | return Empty; | |
7521 | end if; | |
7522 | ||
d44202ba HK |
7523 | -- If the body already exists, then this is an error unless |
7524 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
7525 | -- derived subprogram. It is also legal for an instance to |
7526 | -- contain type conformant overloadable declarations (but the | |
7527 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
7528 | |
7529 | elsif No (Alias (E)) | |
7530 | and then not Is_Intrinsic_Subprogram (E) | |
7531 | and then not In_Instance | |
d44202ba | 7532 | and then Post_Error |
996ae0b0 RK |
7533 | then |
7534 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 7535 | |
07fc65c4 GB |
7536 | if Is_Imported (E) then |
7537 | Error_Msg_NE | |
7538 | ("body not allowed for imported subprogram & declared#", | |
7539 | N, E); | |
7540 | else | |
7541 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
7542 | end if; | |
996ae0b0 RK |
7543 | end if; |
7544 | ||
d44202ba HK |
7545 | -- Child units cannot be overloaded, so a conformance mismatch |
7546 | -- between body and a previous spec is an error. | |
7547 | ||
996ae0b0 RK |
7548 | elsif Is_Child_Unit (E) |
7549 | and then | |
7550 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
7551 | and then | |
5d37ba92 | 7552 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
7553 | N_Compilation_Unit |
7554 | and then Post_Error | |
996ae0b0 | 7555 | then |
996ae0b0 RK |
7556 | Error_Msg_N |
7557 | ("body of child unit does not match previous declaration", N); | |
7558 | end if; | |
7559 | end if; | |
7560 | ||
7561 | <<Next_Entity>> | |
7562 | E := Homonym (E); | |
7563 | end loop; | |
7564 | ||
7565 | -- On exit, we know that no previous declaration of subprogram exists | |
7566 | ||
7567 | return Empty; | |
7568 | end Find_Corresponding_Spec; | |
7569 | ||
7570 | ---------------------- | |
7571 | -- Fully_Conformant -- | |
7572 | ---------------------- | |
7573 | ||
7574 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
7575 | Result : Boolean; | |
996ae0b0 RK |
7576 | begin |
7577 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
7578 | return Result; | |
7579 | end Fully_Conformant; | |
7580 | ||
7581 | ---------------------------------- | |
7582 | -- Fully_Conformant_Expressions -- | |
7583 | ---------------------------------- | |
7584 | ||
7585 | function Fully_Conformant_Expressions | |
7586 | (Given_E1 : Node_Id; | |
d05ef0ab | 7587 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
7588 | is |
7589 | E1 : constant Node_Id := Original_Node (Given_E1); | |
7590 | E2 : constant Node_Id := Original_Node (Given_E2); | |
7591 | -- We always test conformance on original nodes, since it is possible | |
7592 | -- for analysis and/or expansion to make things look as though they | |
7593 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
7594 | ||
7595 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
7596 | renames Fully_Conformant_Expressions; | |
7597 | ||
7598 | function FCL (L1, L2 : List_Id) return Boolean; | |
70f4ad20 AC |
7599 | -- Compare elements of two lists for conformance. Elements have to be |
7600 | -- conformant, and actuals inserted as default parameters do not match | |
7601 | -- explicit actuals with the same value. | |
996ae0b0 RK |
7602 | |
7603 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 7604 | -- Compare an operator node with a function call |
996ae0b0 RK |
7605 | |
7606 | --------- | |
7607 | -- FCL -- | |
7608 | --------- | |
7609 | ||
7610 | function FCL (L1, L2 : List_Id) return Boolean is | |
7611 | N1, N2 : Node_Id; | |
7612 | ||
7613 | begin | |
7614 | if L1 = No_List then | |
7615 | N1 := Empty; | |
7616 | else | |
7617 | N1 := First (L1); | |
7618 | end if; | |
7619 | ||
7620 | if L2 = No_List then | |
7621 | N2 := Empty; | |
7622 | else | |
7623 | N2 := First (L2); | |
7624 | end if; | |
7625 | ||
70f4ad20 | 7626 | -- Compare two lists, skipping rewrite insertions (we want to compare |
a90bd866 | 7627 | -- the original trees, not the expanded versions). |
996ae0b0 RK |
7628 | |
7629 | loop | |
7630 | if Is_Rewrite_Insertion (N1) then | |
7631 | Next (N1); | |
7632 | elsif Is_Rewrite_Insertion (N2) then | |
7633 | Next (N2); | |
7634 | elsif No (N1) then | |
7635 | return No (N2); | |
7636 | elsif No (N2) then | |
7637 | return False; | |
7638 | elsif not FCE (N1, N2) then | |
7639 | return False; | |
7640 | else | |
7641 | Next (N1); | |
7642 | Next (N2); | |
7643 | end if; | |
7644 | end loop; | |
7645 | end FCL; | |
7646 | ||
7647 | --------- | |
7648 | -- FCO -- | |
7649 | --------- | |
7650 | ||
7651 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
7652 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
7653 | Act : Node_Id; | |
7654 | ||
7655 | begin | |
7656 | if No (Actuals) | |
7657 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
7658 | then | |
7659 | return False; | |
7660 | ||
7661 | else | |
7662 | Act := First (Actuals); | |
7663 | ||
7664 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
7665 | if not FCE (Left_Opnd (Op_Node), Act) then |
7666 | return False; | |
7667 | end if; | |
7668 | ||
7669 | Next (Act); | |
7670 | end if; | |
7671 | ||
7672 | return Present (Act) | |
7673 | and then FCE (Right_Opnd (Op_Node), Act) | |
7674 | and then No (Next (Act)); | |
7675 | end if; | |
7676 | end FCO; | |
7677 | ||
7678 | -- Start of processing for Fully_Conformant_Expressions | |
7679 | ||
7680 | begin | |
7681 | -- Non-conformant if paren count does not match. Note: if some idiot | |
7682 | -- complains that we don't do this right for more than 3 levels of | |
a90bd866 | 7683 | -- parentheses, they will be treated with the respect they deserve. |
996ae0b0 RK |
7684 | |
7685 | if Paren_Count (E1) /= Paren_Count (E2) then | |
7686 | return False; | |
7687 | ||
82c80734 RD |
7688 | -- If same entities are referenced, then they are conformant even if |
7689 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
7690 | |
7691 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
7692 | if Present (Entity (E1)) then | |
7693 | return Entity (E1) = Entity (E2) | |
7694 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
7695 | and then Ekind (Entity (E1)) = E_Discriminant | |
7696 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
7697 | ||
7698 | elsif Nkind (E1) = N_Expanded_Name | |
7699 | and then Nkind (E2) = N_Expanded_Name | |
7700 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
7701 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
7702 | then | |
7703 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
7704 | ||
7705 | else | |
7706 | -- Identifiers in component associations don't always have | |
7707 | -- entities, but their names must conform. | |
7708 | ||
7709 | return Nkind (E1) = N_Identifier | |
7710 | and then Nkind (E2) = N_Identifier | |
7711 | and then Chars (E1) = Chars (E2); | |
7712 | end if; | |
7713 | ||
7714 | elsif Nkind (E1) = N_Character_Literal | |
7715 | and then Nkind (E2) = N_Expanded_Name | |
7716 | then | |
7717 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
7718 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
7719 | ||
7720 | elsif Nkind (E2) = N_Character_Literal | |
7721 | and then Nkind (E1) = N_Expanded_Name | |
7722 | then | |
7723 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
7724 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
7725 | ||
8fde064e | 7726 | elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
996ae0b0 RK |
7727 | return FCO (E1, E2); |
7728 | ||
8fde064e | 7729 | elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
996ae0b0 RK |
7730 | return FCO (E2, E1); |
7731 | ||
7732 | -- Otherwise we must have the same syntactic entity | |
7733 | ||
7734 | elsif Nkind (E1) /= Nkind (E2) then | |
7735 | return False; | |
7736 | ||
7737 | -- At this point, we specialize by node type | |
7738 | ||
7739 | else | |
7740 | case Nkind (E1) is | |
7741 | ||
7742 | when N_Aggregate => | |
7743 | return | |
7744 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
7745 | and then |
7746 | FCL (Component_Associations (E1), | |
7747 | Component_Associations (E2)); | |
996ae0b0 RK |
7748 | |
7749 | when N_Allocator => | |
7750 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
7751 | or else | |
7752 | Nkind (Expression (E2)) = N_Qualified_Expression | |
7753 | then | |
7754 | return FCE (Expression (E1), Expression (E2)); | |
7755 | ||
7756 | -- Check that the subtype marks and any constraints | |
7757 | -- are conformant | |
7758 | ||
7759 | else | |
7760 | declare | |
7761 | Indic1 : constant Node_Id := Expression (E1); | |
7762 | Indic2 : constant Node_Id := Expression (E2); | |
7763 | Elt1 : Node_Id; | |
7764 | Elt2 : Node_Id; | |
7765 | ||
7766 | begin | |
7767 | if Nkind (Indic1) /= N_Subtype_Indication then | |
7768 | return | |
7769 | Nkind (Indic2) /= N_Subtype_Indication | |
7770 | and then Entity (Indic1) = Entity (Indic2); | |
7771 | ||
7772 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
7773 | return | |
7774 | Nkind (Indic1) /= N_Subtype_Indication | |
7775 | and then Entity (Indic1) = Entity (Indic2); | |
7776 | ||
7777 | else | |
7778 | if Entity (Subtype_Mark (Indic1)) /= | |
7779 | Entity (Subtype_Mark (Indic2)) | |
7780 | then | |
7781 | return False; | |
7782 | end if; | |
7783 | ||
7784 | Elt1 := First (Constraints (Constraint (Indic1))); | |
7785 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
7786 | while Present (Elt1) and then Present (Elt2) loop |
7787 | if not FCE (Elt1, Elt2) then | |
7788 | return False; | |
7789 | end if; | |
7790 | ||
7791 | Next (Elt1); | |
7792 | Next (Elt2); | |
7793 | end loop; | |
7794 | ||
7795 | return True; | |
7796 | end if; | |
7797 | end; | |
7798 | end if; | |
7799 | ||
7800 | when N_Attribute_Reference => | |
7801 | return | |
7802 | Attribute_Name (E1) = Attribute_Name (E2) | |
7803 | and then FCL (Expressions (E1), Expressions (E2)); | |
7804 | ||
7805 | when N_Binary_Op => | |
7806 | return | |
7807 | Entity (E1) = Entity (E2) | |
7808 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7809 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7810 | ||
514d0fc5 | 7811 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
7812 | return |
7813 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7814 | and then | |
7815 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7816 | ||
19d846a0 RD |
7817 | when N_Case_Expression => |
7818 | declare | |
7819 | Alt1 : Node_Id; | |
7820 | Alt2 : Node_Id; | |
7821 | ||
7822 | begin | |
7823 | if not FCE (Expression (E1), Expression (E2)) then | |
7824 | return False; | |
7825 | ||
7826 | else | |
7827 | Alt1 := First (Alternatives (E1)); | |
7828 | Alt2 := First (Alternatives (E2)); | |
7829 | loop | |
7830 | if Present (Alt1) /= Present (Alt2) then | |
7831 | return False; | |
7832 | elsif No (Alt1) then | |
7833 | return True; | |
7834 | end if; | |
7835 | ||
7836 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
7837 | or else not FCL (Discrete_Choices (Alt1), | |
7838 | Discrete_Choices (Alt2)) | |
7839 | then | |
7840 | return False; | |
7841 | end if; | |
7842 | ||
7843 | Next (Alt1); | |
7844 | Next (Alt2); | |
7845 | end loop; | |
7846 | end if; | |
7847 | end; | |
7848 | ||
996ae0b0 RK |
7849 | when N_Character_Literal => |
7850 | return | |
7851 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
7852 | ||
7853 | when N_Component_Association => | |
7854 | return | |
7855 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
7856 | and then |
7857 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 7858 | |
996ae0b0 RK |
7859 | when N_Explicit_Dereference => |
7860 | return | |
7861 | FCE (Prefix (E1), Prefix (E2)); | |
7862 | ||
7863 | when N_Extension_Aggregate => | |
7864 | return | |
7865 | FCL (Expressions (E1), Expressions (E2)) | |
7866 | and then Null_Record_Present (E1) = | |
7867 | Null_Record_Present (E2) | |
7868 | and then FCL (Component_Associations (E1), | |
7869 | Component_Associations (E2)); | |
7870 | ||
7871 | when N_Function_Call => | |
7872 | return | |
7873 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
7874 | and then |
7875 | FCL (Parameter_Associations (E1), | |
7876 | Parameter_Associations (E2)); | |
996ae0b0 | 7877 | |
9b16cb57 RD |
7878 | when N_If_Expression => |
7879 | return | |
7880 | FCL (Expressions (E1), Expressions (E2)); | |
7881 | ||
996ae0b0 RK |
7882 | when N_Indexed_Component => |
7883 | return | |
7884 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7885 | and then |
7886 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
7887 | |
7888 | when N_Integer_Literal => | |
7889 | return (Intval (E1) = Intval (E2)); | |
7890 | ||
7891 | when N_Null => | |
7892 | return True; | |
7893 | ||
7894 | when N_Operator_Symbol => | |
7895 | return | |
7896 | Chars (E1) = Chars (E2); | |
7897 | ||
7898 | when N_Others_Choice => | |
7899 | return True; | |
7900 | ||
7901 | when N_Parameter_Association => | |
7902 | return | |
996ae0b0 RK |
7903 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
7904 | and then FCE (Explicit_Actual_Parameter (E1), | |
7905 | Explicit_Actual_Parameter (E2)); | |
7906 | ||
7907 | when N_Qualified_Expression => | |
7908 | return | |
7909 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7910 | and then |
7911 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 7912 | |
2010d078 AC |
7913 | when N_Quantified_Expression => |
7914 | if not FCE (Condition (E1), Condition (E2)) then | |
7915 | return False; | |
7916 | end if; | |
7917 | ||
7918 | if Present (Loop_Parameter_Specification (E1)) | |
7919 | and then Present (Loop_Parameter_Specification (E2)) | |
7920 | then | |
7921 | declare | |
7922 | L1 : constant Node_Id := | |
7923 | Loop_Parameter_Specification (E1); | |
7924 | L2 : constant Node_Id := | |
7925 | Loop_Parameter_Specification (E2); | |
7926 | ||
7927 | begin | |
7928 | return | |
7929 | Reverse_Present (L1) = Reverse_Present (L2) | |
7930 | and then | |
7931 | FCE (Defining_Identifier (L1), | |
7932 | Defining_Identifier (L2)) | |
7933 | and then | |
7934 | FCE (Discrete_Subtype_Definition (L1), | |
7935 | Discrete_Subtype_Definition (L2)); | |
7936 | end; | |
7937 | ||
804670f1 AC |
7938 | elsif Present (Iterator_Specification (E1)) |
7939 | and then Present (Iterator_Specification (E2)) | |
7940 | then | |
2010d078 AC |
7941 | declare |
7942 | I1 : constant Node_Id := Iterator_Specification (E1); | |
7943 | I2 : constant Node_Id := Iterator_Specification (E2); | |
7944 | ||
7945 | begin | |
7946 | return | |
7947 | FCE (Defining_Identifier (I1), | |
7948 | Defining_Identifier (I2)) | |
7949 | and then | |
7950 | Of_Present (I1) = Of_Present (I2) | |
7951 | and then | |
7952 | Reverse_Present (I1) = Reverse_Present (I2) | |
7953 | and then FCE (Name (I1), Name (I2)) | |
7954 | and then FCE (Subtype_Indication (I1), | |
7955 | Subtype_Indication (I2)); | |
7956 | end; | |
804670f1 AC |
7957 | |
7958 | -- The quantified expressions used different specifications to | |
7959 | -- walk their respective ranges. | |
7960 | ||
7961 | else | |
7962 | return False; | |
2010d078 AC |
7963 | end if; |
7964 | ||
996ae0b0 RK |
7965 | when N_Range => |
7966 | return | |
7967 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
7968 | and then |
7969 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
7970 | |
7971 | when N_Real_Literal => | |
7972 | return (Realval (E1) = Realval (E2)); | |
7973 | ||
7974 | when N_Selected_Component => | |
7975 | return | |
7976 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7977 | and then |
7978 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
7979 | |
7980 | when N_Slice => | |
7981 | return | |
7982 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7983 | and then |
7984 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
7985 | |
7986 | when N_String_Literal => | |
7987 | declare | |
7988 | S1 : constant String_Id := Strval (E1); | |
7989 | S2 : constant String_Id := Strval (E2); | |
7990 | L1 : constant Nat := String_Length (S1); | |
7991 | L2 : constant Nat := String_Length (S2); | |
7992 | ||
7993 | begin | |
7994 | if L1 /= L2 then | |
7995 | return False; | |
7996 | ||
7997 | else | |
7998 | for J in 1 .. L1 loop | |
7999 | if Get_String_Char (S1, J) /= | |
8000 | Get_String_Char (S2, J) | |
8001 | then | |
8002 | return False; | |
8003 | end if; | |
8004 | end loop; | |
8005 | ||
8006 | return True; | |
8007 | end if; | |
8008 | end; | |
8009 | ||
8010 | when N_Type_Conversion => | |
8011 | return | |
8012 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
8013 | and then |
8014 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
8015 | |
8016 | when N_Unary_Op => | |
8017 | return | |
8018 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
8019 | and then |
8020 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
8021 | |
8022 | when N_Unchecked_Type_Conversion => | |
8023 | return | |
8024 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
8025 | and then |
8026 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
8027 | |
8028 | -- All other node types cannot appear in this context. Strictly | |
8029 | -- we should raise a fatal internal error. Instead we just ignore | |
8030 | -- the nodes. This means that if anyone makes a mistake in the | |
2995860f AC |
8031 | -- expander and mucks an expression tree irretrievably, the result |
8032 | -- will be a failure to detect a (probably very obscure) case | |
8033 | -- of non-conformance, which is better than bombing on some | |
996ae0b0 RK |
8034 | -- case where two expressions do in fact conform. |
8035 | ||
8036 | when others => | |
8037 | return True; | |
8038 | ||
8039 | end case; | |
8040 | end if; | |
8041 | end Fully_Conformant_Expressions; | |
8042 | ||
fbf5a39b AC |
8043 | ---------------------------------------- |
8044 | -- Fully_Conformant_Discrete_Subtypes -- | |
8045 | ---------------------------------------- | |
8046 | ||
8047 | function Fully_Conformant_Discrete_Subtypes | |
8048 | (Given_S1 : Node_Id; | |
d05ef0ab | 8049 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
8050 | is |
8051 | S1 : constant Node_Id := Original_Node (Given_S1); | |
8052 | S2 : constant Node_Id := Original_Node (Given_S2); | |
8053 | ||
8054 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
8055 | -- Special-case for a bound given by a discriminant, which in the body |
8056 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
8057 | |
8058 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 8059 | -- Check both bounds |
fbf5a39b | 8060 | |
5d37ba92 ES |
8061 | ----------------------- |
8062 | -- Conforming_Bounds -- | |
8063 | ----------------------- | |
8064 | ||
fbf5a39b AC |
8065 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
8066 | begin | |
8067 | if Is_Entity_Name (B1) | |
8068 | and then Is_Entity_Name (B2) | |
8069 | and then Ekind (Entity (B1)) = E_Discriminant | |
8070 | then | |
8071 | return Chars (B1) = Chars (B2); | |
8072 | ||
8073 | else | |
8074 | return Fully_Conformant_Expressions (B1, B2); | |
8075 | end if; | |
8076 | end Conforming_Bounds; | |
8077 | ||
5d37ba92 ES |
8078 | ----------------------- |
8079 | -- Conforming_Ranges -- | |
8080 | ----------------------- | |
8081 | ||
fbf5a39b AC |
8082 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
8083 | begin | |
8084 | return | |
8085 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
8086 | and then | |
8087 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
8088 | end Conforming_Ranges; | |
8089 | ||
8090 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
8091 | ||
8092 | begin | |
8093 | if Nkind (S1) /= Nkind (S2) then | |
8094 | return False; | |
8095 | ||
8096 | elsif Is_Entity_Name (S1) then | |
8097 | return Entity (S1) = Entity (S2); | |
8098 | ||
8099 | elsif Nkind (S1) = N_Range then | |
8100 | return Conforming_Ranges (S1, S2); | |
8101 | ||
8102 | elsif Nkind (S1) = N_Subtype_Indication then | |
8103 | return | |
8104 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
8105 | and then | |
8106 | Conforming_Ranges | |
8107 | (Range_Expression (Constraint (S1)), | |
8108 | Range_Expression (Constraint (S2))); | |
8109 | else | |
8110 | return True; | |
8111 | end if; | |
8112 | end Fully_Conformant_Discrete_Subtypes; | |
8113 | ||
996ae0b0 RK |
8114 | -------------------- |
8115 | -- Install_Entity -- | |
8116 | -------------------- | |
8117 | ||
8118 | procedure Install_Entity (E : Entity_Id) is | |
8119 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
8120 | begin |
8121 | Set_Is_Immediately_Visible (E); | |
8122 | Set_Current_Entity (E); | |
8123 | Set_Homonym (E, Prev); | |
8124 | end Install_Entity; | |
8125 | ||
8126 | --------------------- | |
8127 | -- Install_Formals -- | |
8128 | --------------------- | |
8129 | ||
8130 | procedure Install_Formals (Id : Entity_Id) is | |
8131 | F : Entity_Id; | |
996ae0b0 RK |
8132 | begin |
8133 | F := First_Formal (Id); | |
996ae0b0 RK |
8134 | while Present (F) loop |
8135 | Install_Entity (F); | |
8136 | Next_Formal (F); | |
8137 | end loop; | |
8138 | end Install_Formals; | |
8139 | ||
ce2b6ba5 JM |
8140 | ----------------------------- |
8141 | -- Is_Interface_Conformant -- | |
8142 | ----------------------------- | |
8143 | ||
8144 | function Is_Interface_Conformant | |
8145 | (Tagged_Type : Entity_Id; | |
8146 | Iface_Prim : Entity_Id; | |
8147 | Prim : Entity_Id) return Boolean | |
8148 | is | |
9e92ad49 AC |
8149 | -- The operation may in fact be an inherited (implicit) operation |
8150 | -- rather than the original interface primitive, so retrieve the | |
8151 | -- ultimate ancestor. | |
8152 | ||
8153 | Iface : constant Entity_Id := | |
8154 | Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); | |
fceeaab6 ES |
8155 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
8156 | ||
25ebc085 AC |
8157 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
8158 | -- Return the controlling formal of Prim | |
8159 | ||
59e6b23c AC |
8160 | ------------------------ |
8161 | -- Controlling_Formal -- | |
8162 | ------------------------ | |
8163 | ||
25ebc085 | 8164 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
15918371 | 8165 | E : Entity_Id; |
59e6b23c | 8166 | |
25ebc085 | 8167 | begin |
15918371 | 8168 | E := First_Entity (Prim); |
25ebc085 AC |
8169 | while Present (E) loop |
8170 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
8171 | return E; | |
8172 | end if; | |
8173 | ||
8174 | Next_Entity (E); | |
8175 | end loop; | |
8176 | ||
8177 | return Empty; | |
8178 | end Controlling_Formal; | |
8179 | ||
8180 | -- Local variables | |
8181 | ||
8182 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
8183 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
8184 | ||
8185 | -- Start of processing for Is_Interface_Conformant | |
8186 | ||
ce2b6ba5 JM |
8187 | begin |
8188 | pragma Assert (Is_Subprogram (Iface_Prim) | |
8189 | and then Is_Subprogram (Prim) | |
8190 | and then Is_Dispatching_Operation (Iface_Prim) | |
8191 | and then Is_Dispatching_Operation (Prim)); | |
8192 | ||
fceeaab6 | 8193 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
8194 | or else (Present (Alias (Iface_Prim)) |
8195 | and then | |
8196 | Is_Interface | |
8197 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
8198 | ||
8199 | if Prim = Iface_Prim | |
8200 | or else not Is_Subprogram (Prim) | |
8201 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
8202 | or else not Is_Dispatching_Operation (Prim) | |
8203 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 | 8204 | or else No (Typ) |
8a49a499 | 8205 | or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
ce2b6ba5 JM |
8206 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
8207 | then | |
8208 | return False; | |
8209 | ||
25ebc085 AC |
8210 | -- The mode of the controlling formals must match |
8211 | ||
8212 | elsif Present (Iface_Ctrl_F) | |
15918371 AC |
8213 | and then Present (Prim_Ctrl_F) |
8214 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
25ebc085 AC |
8215 | then |
8216 | return False; | |
8217 | ||
8218 | -- Case of a procedure, or a function whose result type matches the | |
8219 | -- result type of the interface primitive, or a function that has no | |
8220 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
8221 | |
8222 | elsif Ekind (Iface_Prim) = E_Procedure | |
8223 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 8224 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 8225 | then |
b4d7b435 AC |
8226 | return Type_Conformant |
8227 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 8228 | |
2995860f AC |
8229 | -- Case of a function returning an interface, or an access to one. Check |
8230 | -- that the return types correspond. | |
ce2b6ba5 | 8231 | |
fceeaab6 ES |
8232 | elsif Implements_Interface (Typ, Iface) then |
8233 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
8234 | /= |
8235 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
8236 | then |
8237 | return False; | |
fceeaab6 ES |
8238 | else |
8239 | return | |
9e92ad49 | 8240 | Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
ce2b6ba5 | 8241 | Skip_Controlling_Formals => True); |
fceeaab6 | 8242 | end if; |
ce2b6ba5 | 8243 | |
fceeaab6 ES |
8244 | else |
8245 | return False; | |
ce2b6ba5 | 8246 | end if; |
ce2b6ba5 JM |
8247 | end Is_Interface_Conformant; |
8248 | ||
996ae0b0 RK |
8249 | --------------------------------- |
8250 | -- Is_Non_Overriding_Operation -- | |
8251 | --------------------------------- | |
8252 | ||
8253 | function Is_Non_Overriding_Operation | |
8254 | (Prev_E : Entity_Id; | |
d05ef0ab | 8255 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
8256 | is |
8257 | Formal : Entity_Id; | |
8258 | F_Typ : Entity_Id; | |
8259 | G_Typ : Entity_Id := Empty; | |
8260 | ||
8261 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
8262 | -- If F_Type is a derived type associated with a generic actual subtype, |
8263 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
8264 | |
8265 | function Types_Correspond | |
8266 | (P_Type : Entity_Id; | |
d05ef0ab | 8267 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
8268 | -- Returns true if and only if the types (or designated types in the |
8269 | -- case of anonymous access types) are the same or N_Type is derived | |
8270 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
8271 | |
8272 | ----------------------------- | |
8273 | -- Get_Generic_Parent_Type -- | |
8274 | ----------------------------- | |
8275 | ||
8276 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
8277 | G_Typ : Entity_Id; | |
702d2020 | 8278 | Defn : Node_Id; |
996ae0b0 RK |
8279 | Indic : Node_Id; |
8280 | ||
8281 | begin | |
8282 | if Is_Derived_Type (F_Typ) | |
8283 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
8284 | then | |
82c80734 RD |
8285 | -- The tree must be traversed to determine the parent subtype in |
8286 | -- the generic unit, which unfortunately isn't always available | |
8287 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
8288 | -- is needed for cases where a full derived type has been | |
8289 | -- rewritten.) | |
996ae0b0 | 8290 | |
bff469f7 AC |
8291 | -- If the parent type is a scalar type, the derivation creates |
8292 | -- an anonymous base type for it, and the source type is its | |
8293 | -- first subtype. | |
8294 | ||
8295 | if Is_Scalar_Type (F_Typ) | |
8296 | and then not Comes_From_Source (F_Typ) | |
8297 | then | |
8298 | Defn := | |
8299 | Type_Definition | |
0c6826a5 | 8300 | (Original_Node (Parent (First_Subtype (F_Typ)))); |
bff469f7 AC |
8301 | else |
8302 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); | |
8303 | end if; | |
702d2020 AC |
8304 | if Nkind (Defn) = N_Derived_Type_Definition then |
8305 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 8306 | |
702d2020 AC |
8307 | if Nkind (Indic) = N_Subtype_Indication then |
8308 | G_Typ := Entity (Subtype_Mark (Indic)); | |
8309 | else | |
8310 | G_Typ := Entity (Indic); | |
8311 | end if; | |
996ae0b0 | 8312 | |
702d2020 AC |
8313 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
8314 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
8315 | then | |
8316 | return Generic_Parent_Type (Parent (G_Typ)); | |
8317 | end if; | |
996ae0b0 RK |
8318 | end if; |
8319 | end if; | |
8320 | ||
8321 | return Empty; | |
8322 | end Get_Generic_Parent_Type; | |
8323 | ||
8324 | ---------------------- | |
8325 | -- Types_Correspond -- | |
8326 | ---------------------- | |
8327 | ||
8328 | function Types_Correspond | |
8329 | (P_Type : Entity_Id; | |
d05ef0ab | 8330 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
8331 | is |
8332 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
8333 | New_Type : Entity_Id := Base_Type (N_Type); | |
8334 | ||
8335 | begin | |
8336 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
8337 | Prev_Type := Designated_Type (Prev_Type); | |
8338 | end if; | |
8339 | ||
8340 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
8341 | New_Type := Designated_Type (New_Type); | |
8342 | end if; | |
8343 | ||
8344 | if Prev_Type = New_Type then | |
8345 | return True; | |
8346 | ||
8347 | elsif not Is_Class_Wide_Type (New_Type) then | |
8348 | while Etype (New_Type) /= New_Type loop | |
8349 | New_Type := Etype (New_Type); | |
0c6826a5 | 8350 | |
996ae0b0 RK |
8351 | if New_Type = Prev_Type then |
8352 | return True; | |
8353 | end if; | |
8354 | end loop; | |
8355 | end if; | |
8356 | return False; | |
8357 | end Types_Correspond; | |
8358 | ||
8359 | -- Start of processing for Is_Non_Overriding_Operation | |
8360 | ||
8361 | begin | |
82c80734 RD |
8362 | -- In the case where both operations are implicit derived subprograms |
8363 | -- then neither overrides the other. This can only occur in certain | |
8364 | -- obscure cases (e.g., derivation from homographs created in a generic | |
8365 | -- instantiation). | |
996ae0b0 RK |
8366 | |
8367 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
8368 | return True; | |
8369 | ||
8370 | elsif Ekind (Current_Scope) = E_Package | |
8371 | and then Is_Generic_Instance (Current_Scope) | |
8372 | and then In_Private_Part (Current_Scope) | |
8373 | and then Comes_From_Source (New_E) | |
8374 | then | |
702d2020 AC |
8375 | -- We examine the formals and result type of the inherited operation, |
8376 | -- to determine whether their type is derived from (the instance of) | |
8377 | -- a generic type. The first such formal or result type is the one | |
8378 | -- tested. | |
996ae0b0 RK |
8379 | |
8380 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
8381 | while Present (Formal) loop |
8382 | F_Typ := Base_Type (Etype (Formal)); | |
8383 | ||
8384 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
8385 | F_Typ := Designated_Type (F_Typ); | |
8386 | end if; | |
8387 | ||
8388 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 8389 | exit when Present (G_Typ); |
996ae0b0 RK |
8390 | |
8391 | Next_Formal (Formal); | |
8392 | end loop; | |
8393 | ||
c8ef728f | 8394 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
8395 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
8396 | end if; | |
8397 | ||
8398 | if No (G_Typ) then | |
8399 | return False; | |
8400 | end if; | |
8401 | ||
8dbd1460 AC |
8402 | -- If the generic type is a private type, then the original operation |
8403 | -- was not overriding in the generic, because there was no primitive | |
8404 | -- operation to override. | |
996ae0b0 RK |
8405 | |
8406 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
8407 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 8408 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
8409 | then |
8410 | return True; | |
8411 | ||
8412 | -- The generic parent type is the ancestor of a formal derived | |
8413 | -- type declaration. We need to check whether it has a primitive | |
8414 | -- operation that should be overridden by New_E in the generic. | |
8415 | ||
8416 | else | |
8417 | declare | |
8418 | P_Formal : Entity_Id; | |
8419 | N_Formal : Entity_Id; | |
8420 | P_Typ : Entity_Id; | |
8421 | N_Typ : Entity_Id; | |
8422 | P_Prim : Entity_Id; | |
8423 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
8424 | ||
8425 | begin | |
8426 | while Present (Prim_Elt) loop | |
8427 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 8428 | |
996ae0b0 RK |
8429 | if Chars (P_Prim) = Chars (New_E) |
8430 | and then Ekind (P_Prim) = Ekind (New_E) | |
8431 | then | |
8432 | P_Formal := First_Formal (P_Prim); | |
8433 | N_Formal := First_Formal (New_E); | |
8434 | while Present (P_Formal) and then Present (N_Formal) loop | |
8435 | P_Typ := Etype (P_Formal); | |
8436 | N_Typ := Etype (N_Formal); | |
8437 | ||
8438 | if not Types_Correspond (P_Typ, N_Typ) then | |
8439 | exit; | |
8440 | end if; | |
8441 | ||
8442 | Next_Entity (P_Formal); | |
8443 | Next_Entity (N_Formal); | |
8444 | end loop; | |
8445 | ||
82c80734 RD |
8446 | -- Found a matching primitive operation belonging to the |
8447 | -- formal ancestor type, so the new subprogram is | |
8448 | -- overriding. | |
996ae0b0 | 8449 | |
c8ef728f ES |
8450 | if No (P_Formal) |
8451 | and then No (N_Formal) | |
996ae0b0 RK |
8452 | and then (Ekind (New_E) /= E_Function |
8453 | or else | |
8fde064e AC |
8454 | Types_Correspond |
8455 | (Etype (P_Prim), Etype (New_E))) | |
996ae0b0 RK |
8456 | then |
8457 | return False; | |
8458 | end if; | |
8459 | end if; | |
8460 | ||
8461 | Next_Elmt (Prim_Elt); | |
8462 | end loop; | |
8463 | ||
2995860f AC |
8464 | -- If no match found, then the new subprogram does not override |
8465 | -- in the generic (nor in the instance). | |
996ae0b0 | 8466 | |
260359e3 AC |
8467 | -- If the type in question is not abstract, and the subprogram |
8468 | -- is, this will be an error if the new operation is in the | |
8469 | -- private part of the instance. Emit a warning now, which will | |
8470 | -- make the subsequent error message easier to understand. | |
8471 | ||
8472 | if not Is_Abstract_Type (F_Typ) | |
8473 | and then Is_Abstract_Subprogram (Prev_E) | |
8474 | and then In_Private_Part (Current_Scope) | |
8475 | then | |
8476 | Error_Msg_Node_2 := F_Typ; | |
8477 | Error_Msg_NE | |
3ccedacc AC |
8478 | ("private operation& in generic unit does not override " |
8479 | & "any primitive operation of& (RM 12.3 (18))??", | |
260359e3 AC |
8480 | New_E, New_E); |
8481 | end if; | |
8482 | ||
996ae0b0 RK |
8483 | return True; |
8484 | end; | |
8485 | end if; | |
8486 | else | |
8487 | return False; | |
8488 | end if; | |
8489 | end Is_Non_Overriding_Operation; | |
8490 | ||
beacce02 AC |
8491 | ------------------------------------- |
8492 | -- List_Inherited_Pre_Post_Aspects -- | |
8493 | ------------------------------------- | |
8494 | ||
8495 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
8496 | begin | |
e606088a | 8497 | if Opt.List_Inherited_Aspects |
b9696ffb | 8498 | and then Is_Subprogram_Or_Generic_Subprogram (E) |
beacce02 AC |
8499 | then |
8500 | declare | |
c9d70ab1 AC |
8501 | Subps : constant Subprogram_List := Inherited_Subprograms (E); |
8502 | Items : Node_Id; | |
8503 | Prag : Node_Id; | |
beacce02 AC |
8504 | |
8505 | begin | |
c9d70ab1 AC |
8506 | for Index in Subps'Range loop |
8507 | Items := Contract (Subps (Index)); | |
8508 | ||
8509 | if Present (Items) then | |
8510 | Prag := Pre_Post_Conditions (Items); | |
8511 | while Present (Prag) loop | |
8512 | Error_Msg_Sloc := Sloc (Prag); | |
8513 | ||
8514 | if Class_Present (Prag) | |
8515 | and then not Split_PPC (Prag) | |
8516 | then | |
8517 | if Pragma_Name (Prag) = Name_Precondition then | |
8518 | Error_Msg_N | |
8519 | ("info: & inherits `Pre''Class` aspect from " | |
8520 | & "#?L?", E); | |
8521 | else | |
8522 | Error_Msg_N | |
8523 | ("info: & inherits `Post''Class` aspect from " | |
8524 | & "#?L?", E); | |
8525 | end if; | |
beacce02 | 8526 | end if; |
beacce02 | 8527 | |
c9d70ab1 AC |
8528 | Prag := Next_Pragma (Prag); |
8529 | end loop; | |
8530 | end if; | |
beacce02 AC |
8531 | end loop; |
8532 | end; | |
8533 | end if; | |
8534 | end List_Inherited_Pre_Post_Aspects; | |
8535 | ||
996ae0b0 RK |
8536 | ------------------------------ |
8537 | -- Make_Inequality_Operator -- | |
8538 | ------------------------------ | |
8539 | ||
8540 | -- S is the defining identifier of an equality operator. We build a | |
8541 | -- subprogram declaration with the right signature. This operation is | |
8542 | -- intrinsic, because it is always expanded as the negation of the | |
8543 | -- call to the equality function. | |
8544 | ||
8545 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
8546 | Loc : constant Source_Ptr := Sloc (S); | |
8547 | Decl : Node_Id; | |
8548 | Formals : List_Id; | |
8549 | Op_Name : Entity_Id; | |
8550 | ||
c8ef728f ES |
8551 | FF : constant Entity_Id := First_Formal (S); |
8552 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
8553 | |
8554 | begin | |
c8ef728f | 8555 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 8556 | |
c8ef728f | 8557 | if No (NF) then |
996ae0b0 RK |
8558 | return; |
8559 | end if; | |
8560 | ||
c8ef728f ES |
8561 | declare |
8562 | A : constant Entity_Id := | |
8563 | Make_Defining_Identifier (Sloc (FF), | |
8564 | Chars => Chars (FF)); | |
8565 | ||
5d37ba92 ES |
8566 | B : constant Entity_Id := |
8567 | Make_Defining_Identifier (Sloc (NF), | |
8568 | Chars => Chars (NF)); | |
c8ef728f ES |
8569 | |
8570 | begin | |
8571 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
8572 | ||
8573 | Formals := New_List ( | |
8574 | Make_Parameter_Specification (Loc, | |
8575 | Defining_Identifier => A, | |
8576 | Parameter_Type => | |
e4494292 | 8577 | New_Occurrence_Of (Etype (First_Formal (S)), |
c8ef728f ES |
8578 | Sloc (Etype (First_Formal (S))))), |
8579 | ||
8580 | Make_Parameter_Specification (Loc, | |
8581 | Defining_Identifier => B, | |
8582 | Parameter_Type => | |
e4494292 | 8583 | New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
c8ef728f ES |
8584 | Sloc (Etype (Next_Formal (First_Formal (S))))))); |
8585 | ||
8586 | Decl := | |
8587 | Make_Subprogram_Declaration (Loc, | |
8588 | Specification => | |
8589 | Make_Function_Specification (Loc, | |
8590 | Defining_Unit_Name => Op_Name, | |
8591 | Parameter_Specifications => Formals, | |
8592 | Result_Definition => | |
e4494292 | 8593 | New_Occurrence_Of (Standard_Boolean, Loc))); |
c8ef728f ES |
8594 | |
8595 | -- Insert inequality right after equality if it is explicit or after | |
8596 | -- the derived type when implicit. These entities are created only | |
2995860f AC |
8597 | -- for visibility purposes, and eventually replaced in the course |
8598 | -- of expansion, so they do not need to be attached to the tree and | |
8599 | -- seen by the back-end. Keeping them internal also avoids spurious | |
c8ef728f ES |
8600 | -- freezing problems. The declaration is inserted in the tree for |
8601 | -- analysis, and removed afterwards. If the equality operator comes | |
8602 | -- from an explicit declaration, attach the inequality immediately | |
8603 | -- after. Else the equality is inherited from a derived type | |
8604 | -- declaration, so insert inequality after that declaration. | |
8605 | ||
8606 | if No (Alias (S)) then | |
8607 | Insert_After (Unit_Declaration_Node (S), Decl); | |
8608 | elsif Is_List_Member (Parent (S)) then | |
8609 | Insert_After (Parent (S), Decl); | |
8610 | else | |
8611 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
8612 | end if; | |
996ae0b0 | 8613 | |
c8ef728f ES |
8614 | Mark_Rewrite_Insertion (Decl); |
8615 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
8616 | Analyze (Decl); | |
8617 | Remove (Decl); | |
8618 | Set_Has_Completion (Op_Name); | |
8619 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 8620 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 8621 | end; |
996ae0b0 RK |
8622 | end Make_Inequality_Operator; |
8623 | ||
8624 | ---------------------- | |
8625 | -- May_Need_Actuals -- | |
8626 | ---------------------- | |
8627 | ||
8628 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
8629 | F : Entity_Id; | |
8630 | B : Boolean; | |
8631 | ||
8632 | begin | |
8633 | F := First_Formal (Fun); | |
8634 | B := True; | |
996ae0b0 RK |
8635 | while Present (F) loop |
8636 | if No (Default_Value (F)) then | |
8637 | B := False; | |
8638 | exit; | |
8639 | end if; | |
8640 | ||
8641 | Next_Formal (F); | |
8642 | end loop; | |
8643 | ||
8644 | Set_Needs_No_Actuals (Fun, B); | |
8645 | end May_Need_Actuals; | |
8646 | ||
8647 | --------------------- | |
8648 | -- Mode_Conformant -- | |
8649 | --------------------- | |
8650 | ||
8651 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
8652 | Result : Boolean; | |
996ae0b0 RK |
8653 | begin |
8654 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
8655 | return Result; | |
8656 | end Mode_Conformant; | |
8657 | ||
8658 | --------------------------- | |
8659 | -- New_Overloaded_Entity -- | |
8660 | --------------------------- | |
8661 | ||
8662 | procedure New_Overloaded_Entity | |
8663 | (S : Entity_Id; | |
8664 | Derived_Type : Entity_Id := Empty) | |
8665 | is | |
ec4867fa | 8666 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
8667 | -- Set if the current scope has an operation that is type-conformant |
8668 | -- with S, and becomes hidden by S. | |
8669 | ||
5d37ba92 ES |
8670 | Is_Primitive_Subp : Boolean; |
8671 | -- Set to True if the new subprogram is primitive | |
8672 | ||
fbf5a39b AC |
8673 | E : Entity_Id; |
8674 | -- Entity that S overrides | |
8675 | ||
996ae0b0 | 8676 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
8677 | -- Predecessor of E in Homonym chain |
8678 | ||
5d37ba92 ES |
8679 | procedure Check_For_Primitive_Subprogram |
8680 | (Is_Primitive : out Boolean; | |
8681 | Is_Overriding : Boolean := False); | |
8682 | -- If the subprogram being analyzed is a primitive operation of the type | |
8683 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
8684 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
8685 | -- corresponding flag on the entity itself for later use. | |
8686 | ||
ec4867fa ES |
8687 | procedure Check_Synchronized_Overriding |
8688 | (Def_Id : Entity_Id; | |
ec4867fa ES |
8689 | Overridden_Subp : out Entity_Id); |
8690 | -- First determine if Def_Id is an entry or a subprogram either defined | |
8691 | -- in the scope of a task or protected type, or is a primitive of such | |
8692 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
8693 | -- implemented by the synchronized type, return the overridden entity | |
8694 | -- or Empty. | |
758c442c | 8695 | |
996ae0b0 RK |
8696 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
8697 | -- Check that E is declared in the private part of the current package, | |
8698 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 8699 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
8700 | -- set when freezing entities, so we must examine the place of the |
8701 | -- declaration in the tree, and recognize wrapper packages as well. | |
8702 | ||
2ddc2000 AC |
8703 | function Is_Overriding_Alias |
8704 | (Old_E : Entity_Id; | |
8705 | New_E : Entity_Id) return Boolean; | |
8706 | -- Check whether new subprogram and old subprogram are both inherited | |
8707 | -- from subprograms that have distinct dispatch table entries. This can | |
2995860f AC |
8708 | -- occur with derivations from instances with accidental homonyms. The |
8709 | -- function is conservative given that the converse is only true within | |
8710 | -- instances that contain accidental overloadings. | |
2ddc2000 | 8711 | |
5d37ba92 ES |
8712 | ------------------------------------ |
8713 | -- Check_For_Primitive_Subprogram -- | |
8714 | ------------------------------------ | |
996ae0b0 | 8715 | |
5d37ba92 ES |
8716 | procedure Check_For_Primitive_Subprogram |
8717 | (Is_Primitive : out Boolean; | |
8718 | Is_Overriding : Boolean := False) | |
ec4867fa | 8719 | is |
996ae0b0 RK |
8720 | Formal : Entity_Id; |
8721 | F_Typ : Entity_Id; | |
07fc65c4 | 8722 | B_Typ : Entity_Id; |
996ae0b0 RK |
8723 | |
8724 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
8725 | -- Returns true if T is declared in the visible part of the current |
8726 | -- package scope; otherwise returns false. Assumes that T is declared | |
8727 | -- in a package. | |
996ae0b0 RK |
8728 | |
8729 | procedure Check_Private_Overriding (T : Entity_Id); | |
8730 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
8731 | -- abstract type is declared in a private part, then it must override |
8732 | -- an abstract subprogram declared in the visible part. Also checks | |
8733 | -- that if a primitive function with a controlling result is declared | |
8734 | -- in a private part, then it must override a function declared in | |
8735 | -- the visible part. | |
996ae0b0 RK |
8736 | |
8737 | ------------------------------ | |
8738 | -- Check_Private_Overriding -- | |
8739 | ------------------------------ | |
8740 | ||
8741 | procedure Check_Private_Overriding (T : Entity_Id) is | |
acf624f2 | 8742 | |
aaeb3b3a AC |
8743 | function Overrides_Visible_Function |
8744 | (Partial_View : Entity_Id) return Boolean; | |
acf624f2 BD |
8745 | -- True if S overrides a function in the visible part. The |
8746 | -- overridden function could be explicitly or implicitly declared. | |
8747 | ||
aaeb3b3a AC |
8748 | function Overrides_Visible_Function |
8749 | (Partial_View : Entity_Id) return Boolean | |
8750 | is | |
acf624f2 BD |
8751 | begin |
8752 | if not Is_Overriding or else not Has_Homonym (S) then | |
8753 | return False; | |
8754 | end if; | |
8755 | ||
aaeb3b3a | 8756 | if not Present (Partial_View) then |
acf624f2 BD |
8757 | return True; |
8758 | end if; | |
8759 | ||
8760 | -- Search through all the homonyms H of S in the current | |
8761 | -- package spec, and return True if we find one that matches. | |
8762 | -- Note that Parent (H) will be the declaration of the | |
aaeb3b3a | 8763 | -- partial view of T for a match. |
acf624f2 BD |
8764 | |
8765 | declare | |
8766 | H : Entity_Id := S; | |
8767 | begin | |
8768 | loop | |
8769 | H := Homonym (H); | |
8770 | exit when not Present (H) or else Scope (H) /= Scope (S); | |
8771 | ||
8772 | if Nkind_In | |
8773 | (Parent (H), | |
8774 | N_Private_Extension_Declaration, | |
8775 | N_Private_Type_Declaration) | |
aaeb3b3a | 8776 | and then Defining_Identifier (Parent (H)) = Partial_View |
acf624f2 BD |
8777 | then |
8778 | return True; | |
8779 | end if; | |
8780 | end loop; | |
8781 | end; | |
8782 | ||
8783 | return False; | |
8784 | end Overrides_Visible_Function; | |
8785 | ||
8786 | -- Start of processing for Check_Private_Overriding | |
8787 | ||
996ae0b0 | 8788 | begin |
51c16e29 | 8789 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
8790 | and then In_Private_Part (Current_Scope) |
8791 | and then Visible_Part_Type (T) | |
8792 | and then not In_Instance | |
8793 | then | |
f937473f RD |
8794 | if Is_Abstract_Type (T) |
8795 | and then Is_Abstract_Subprogram (S) | |
8796 | and then (not Is_Overriding | |
8dbd1460 | 8797 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 8798 | then |
3ccedacc AC |
8799 | Error_Msg_N ("abstract subprograms must be visible " |
8800 | & "(RM 3.9.3(10))!", S); | |
758c442c | 8801 | |
aaeb3b3a AC |
8802 | elsif Ekind (S) = E_Function then |
8803 | declare | |
8804 | Partial_View : constant Entity_Id := | |
8805 | Incomplete_Or_Partial_View (T); | |
2e79de51 | 8806 | |
aaeb3b3a AC |
8807 | begin |
8808 | if not Overrides_Visible_Function (Partial_View) then | |
8809 | ||
8810 | -- Here, S is "function ... return T;" declared in | |
8811 | -- the private part, not overriding some visible | |
8812 | -- operation. That's illegal in the tagged case | |
8813 | -- (but not if the private type is untagged). | |
8814 | ||
8815 | if ((Present (Partial_View) | |
8816 | and then Is_Tagged_Type (Partial_View)) | |
8817 | or else (not Present (Partial_View) | |
8818 | and then Is_Tagged_Type (T))) | |
8819 | and then T = Base_Type (Etype (S)) | |
8820 | then | |
8821 | Error_Msg_N | |
8822 | ("private function with tagged result must" | |
8823 | & " override visible-part function", S); | |
8824 | Error_Msg_N | |
8825 | ("\move subprogram to the visible part" | |
8826 | & " (RM 3.9.3(10))", S); | |
8827 | ||
8828 | -- AI05-0073: extend this test to the case of a | |
8829 | -- function with a controlling access result. | |
8830 | ||
8831 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
8832 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
8833 | and then | |
8834 | not Is_Class_Wide_Type | |
8835 | (Designated_Type (Etype (S))) | |
8836 | and then Ada_Version >= Ada_2012 | |
8837 | then | |
8838 | Error_Msg_N | |
8839 | ("private function with controlling access " | |
8840 | & "result must override visible-part function", | |
8841 | S); | |
8842 | Error_Msg_N | |
8843 | ("\move subprogram to the visible part" | |
8844 | & " (RM 3.9.3(10))", S); | |
8845 | end if; | |
8846 | end if; | |
8847 | end; | |
996ae0b0 RK |
8848 | end if; |
8849 | end if; | |
8850 | end Check_Private_Overriding; | |
8851 | ||
8852 | ----------------------- | |
8853 | -- Visible_Part_Type -- | |
8854 | ----------------------- | |
8855 | ||
8856 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
8857 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
8858 | N : Node_Id; | |
996ae0b0 RK |
8859 | |
8860 | begin | |
8dbd1460 AC |
8861 | -- If the entity is a private type, then it must be declared in a |
8862 | -- visible part. | |
996ae0b0 RK |
8863 | |
8864 | if Ekind (T) in Private_Kind then | |
8865 | return True; | |
8866 | end if; | |
8867 | ||
8868 | -- Otherwise, we traverse the visible part looking for its | |
8869 | -- corresponding declaration. We cannot use the declaration | |
8870 | -- node directly because in the private part the entity of a | |
8871 | -- private type is the one in the full view, which does not | |
8872 | -- indicate that it is the completion of something visible. | |
8873 | ||
07fc65c4 | 8874 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
8875 | while Present (N) loop |
8876 | if Nkind (N) = N_Full_Type_Declaration | |
8877 | and then Present (Defining_Identifier (N)) | |
8878 | and then T = Defining_Identifier (N) | |
8879 | then | |
8880 | return True; | |
8881 | ||
800621e0 RD |
8882 | elsif Nkind_In (N, N_Private_Type_Declaration, |
8883 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
8884 | and then Present (Defining_Identifier (N)) |
8885 | and then T = Full_View (Defining_Identifier (N)) | |
8886 | then | |
8887 | return True; | |
8888 | end if; | |
8889 | ||
8890 | Next (N); | |
8891 | end loop; | |
8892 | ||
8893 | return False; | |
8894 | end Visible_Part_Type; | |
8895 | ||
5d37ba92 | 8896 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
8897 | |
8898 | begin | |
5d37ba92 ES |
8899 | Is_Primitive := False; |
8900 | ||
996ae0b0 RK |
8901 | if not Comes_From_Source (S) then |
8902 | null; | |
8903 | ||
5d37ba92 | 8904 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
8905 | |
8906 | elsif Current_Scope = Standard_Standard then | |
8907 | null; | |
8908 | ||
b9b2405f | 8909 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 8910 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 8911 | or else Is_Overriding |
996ae0b0 | 8912 | then |
07fc65c4 | 8913 | -- For function, check return type |
996ae0b0 | 8914 | |
07fc65c4 | 8915 | if Ekind (S) = E_Function then |
5d37ba92 ES |
8916 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
8917 | F_Typ := Designated_Type (Etype (S)); | |
8918 | else | |
8919 | F_Typ := Etype (S); | |
8920 | end if; | |
8921 | ||
8922 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 8923 | |
5d37ba92 ES |
8924 | if Scope (B_Typ) = Current_Scope |
8925 | and then not Is_Class_Wide_Type (B_Typ) | |
8926 | and then not Is_Generic_Type (B_Typ) | |
8927 | then | |
8928 | Is_Primitive := True; | |
07fc65c4 | 8929 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 8930 | Set_Is_Primitive (S); |
07fc65c4 GB |
8931 | Check_Private_Overriding (B_Typ); |
8932 | end if; | |
996ae0b0 RK |
8933 | end if; |
8934 | ||
07fc65c4 | 8935 | -- For all subprograms, check formals |
996ae0b0 | 8936 | |
07fc65c4 | 8937 | Formal := First_Formal (S); |
996ae0b0 RK |
8938 | while Present (Formal) loop |
8939 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
8940 | F_Typ := Designated_Type (Etype (Formal)); | |
8941 | else | |
8942 | F_Typ := Etype (Formal); | |
8943 | end if; | |
8944 | ||
07fc65c4 GB |
8945 | B_Typ := Base_Type (F_Typ); |
8946 | ||
ec4867fa ES |
8947 | if Ekind (B_Typ) = E_Access_Subtype then |
8948 | B_Typ := Base_Type (B_Typ); | |
8949 | end if; | |
8950 | ||
5d37ba92 ES |
8951 | if Scope (B_Typ) = Current_Scope |
8952 | and then not Is_Class_Wide_Type (B_Typ) | |
8953 | and then not Is_Generic_Type (B_Typ) | |
8954 | then | |
8955 | Is_Primitive := True; | |
8956 | Set_Is_Primitive (S); | |
07fc65c4 GB |
8957 | Set_Has_Primitive_Operations (B_Typ); |
8958 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
8959 | end if; |
8960 | ||
8961 | Next_Formal (Formal); | |
8962 | end loop; | |
1aee1fb3 AC |
8963 | |
8964 | -- Special case: An equality function can be redefined for a type | |
8965 | -- occurring in a declarative part, and won't otherwise be treated as | |
8966 | -- a primitive because it doesn't occur in a package spec and doesn't | |
8967 | -- override an inherited subprogram. It's important that we mark it | |
8968 | -- primitive so it can be returned by Collect_Primitive_Operations | |
8969 | -- and be used in composing the equality operation of later types | |
8970 | -- that have a component of the type. | |
8971 | ||
8972 | elsif Chars (S) = Name_Op_Eq | |
8973 | and then Etype (S) = Standard_Boolean | |
8974 | then | |
8975 | B_Typ := Base_Type (Etype (First_Formal (S))); | |
8976 | ||
8977 | if Scope (B_Typ) = Current_Scope | |
8978 | and then | |
8979 | Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ | |
8980 | and then not Is_Limited_Type (B_Typ) | |
8981 | then | |
8982 | Is_Primitive := True; | |
8983 | Set_Is_Primitive (S); | |
8984 | Set_Has_Primitive_Operations (B_Typ); | |
8985 | Check_Private_Overriding (B_Typ); | |
8986 | end if; | |
996ae0b0 | 8987 | end if; |
5d37ba92 ES |
8988 | end Check_For_Primitive_Subprogram; |
8989 | ||
8990 | ----------------------------------- | |
8991 | -- Check_Synchronized_Overriding -- | |
8992 | ----------------------------------- | |
8993 | ||
8994 | procedure Check_Synchronized_Overriding | |
8995 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
8996 | Overridden_Subp : out Entity_Id) |
8997 | is | |
5d37ba92 ES |
8998 | Ifaces_List : Elist_Id; |
8999 | In_Scope : Boolean; | |
9000 | Typ : Entity_Id; | |
9001 | ||
8aa15e3b JM |
9002 | function Matches_Prefixed_View_Profile |
9003 | (Prim_Params : List_Id; | |
9004 | Iface_Params : List_Id) return Boolean; | |
9005 | -- Determine whether a subprogram's parameter profile Prim_Params | |
9006 | -- matches that of a potentially overridden interface subprogram | |
9007 | -- Iface_Params. Also determine if the type of first parameter of | |
9008 | -- Iface_Params is an implemented interface. | |
9009 | ||
8aa15e3b JM |
9010 | ----------------------------------- |
9011 | -- Matches_Prefixed_View_Profile -- | |
9012 | ----------------------------------- | |
9013 | ||
9014 | function Matches_Prefixed_View_Profile | |
9015 | (Prim_Params : List_Id; | |
9016 | Iface_Params : List_Id) return Boolean | |
9017 | is | |
9018 | Iface_Id : Entity_Id; | |
9019 | Iface_Param : Node_Id; | |
9020 | Iface_Typ : Entity_Id; | |
9021 | Prim_Id : Entity_Id; | |
9022 | Prim_Param : Node_Id; | |
9023 | Prim_Typ : Entity_Id; | |
9024 | ||
9025 | function Is_Implemented | |
9026 | (Ifaces_List : Elist_Id; | |
9027 | Iface : Entity_Id) return Boolean; | |
9028 | -- Determine if Iface is implemented by the current task or | |
9029 | -- protected type. | |
9030 | ||
9031 | -------------------- | |
9032 | -- Is_Implemented -- | |
9033 | -------------------- | |
9034 | ||
9035 | function Is_Implemented | |
9036 | (Ifaces_List : Elist_Id; | |
9037 | Iface : Entity_Id) return Boolean | |
9038 | is | |
9039 | Iface_Elmt : Elmt_Id; | |
9040 | ||
9041 | begin | |
9042 | Iface_Elmt := First_Elmt (Ifaces_List); | |
9043 | while Present (Iface_Elmt) loop | |
9044 | if Node (Iface_Elmt) = Iface then | |
9045 | return True; | |
9046 | end if; | |
9047 | ||
9048 | Next_Elmt (Iface_Elmt); | |
9049 | end loop; | |
9050 | ||
9051 | return False; | |
9052 | end Is_Implemented; | |
9053 | ||
9054 | -- Start of processing for Matches_Prefixed_View_Profile | |
9055 | ||
9056 | begin | |
9057 | Iface_Param := First (Iface_Params); | |
9058 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
9059 | ||
9060 | if Is_Access_Type (Iface_Typ) then | |
9061 | Iface_Typ := Designated_Type (Iface_Typ); | |
9062 | end if; | |
9063 | ||
9064 | Prim_Param := First (Prim_Params); | |
9065 | ||
9066 | -- The first parameter of the potentially overridden subprogram | |
9067 | -- must be an interface implemented by Prim. | |
9068 | ||
9069 | if not Is_Interface (Iface_Typ) | |
9070 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
9071 | then | |
9072 | return False; | |
9073 | end if; | |
9074 | ||
9075 | -- The checks on the object parameters are done, move onto the | |
9076 | -- rest of the parameters. | |
9077 | ||
9078 | if not In_Scope then | |
9079 | Prim_Param := Next (Prim_Param); | |
9080 | end if; | |
9081 | ||
9082 | Iface_Param := Next (Iface_Param); | |
9083 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
9084 | Iface_Id := Defining_Identifier (Iface_Param); | |
9085 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
9086 | ||
8aa15e3b JM |
9087 | Prim_Id := Defining_Identifier (Prim_Param); |
9088 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
9089 | ||
15e4986c JM |
9090 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
9091 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
9092 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
9093 | then | |
9094 | Iface_Typ := Designated_Type (Iface_Typ); | |
9095 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
9096 | end if; |
9097 | ||
9098 | -- Case of multiple interface types inside a parameter profile | |
9099 | ||
9100 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
9101 | ||
9102 | -- If the interface type is implemented, then the matching type | |
9103 | -- in the primitive should be the implementing record type. | |
9104 | ||
9105 | if Ekind (Iface_Typ) = E_Record_Type | |
9106 | and then Is_Interface (Iface_Typ) | |
9107 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
9108 | then | |
9109 | if Prim_Typ /= Typ then | |
9110 | return False; | |
9111 | end if; | |
9112 | ||
9113 | -- The two parameters must be both mode and subtype conformant | |
9114 | ||
9115 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
9116 | or else not | |
9117 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
9118 | then | |
9119 | return False; | |
9120 | end if; | |
9121 | ||
9122 | Next (Iface_Param); | |
9123 | Next (Prim_Param); | |
9124 | end loop; | |
9125 | ||
9126 | -- One of the two lists contains more parameters than the other | |
9127 | ||
9128 | if Present (Iface_Param) or else Present (Prim_Param) then | |
9129 | return False; | |
9130 | end if; | |
9131 | ||
9132 | return True; | |
9133 | end Matches_Prefixed_View_Profile; | |
9134 | ||
9135 | -- Start of processing for Check_Synchronized_Overriding | |
9136 | ||
5d37ba92 ES |
9137 | begin |
9138 | Overridden_Subp := Empty; | |
9139 | ||
8aa15e3b JM |
9140 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
9141 | -- primitives internally generated by the frontend; however at this | |
9142 | -- stage predefined primitives are still not fully decorated. As a | |
9143 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 9144 | |
8aa15e3b JM |
9145 | if (Ekind (Def_Id) /= E_Entry |
9146 | and then Ekind (Def_Id) /= E_Function | |
9147 | and then Ekind (Def_Id) /= E_Procedure) | |
9148 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
9149 | then |
9150 | return; | |
9151 | end if; | |
9152 | ||
9153 | -- Search for the concurrent declaration since it contains the list | |
9154 | -- of all implemented interfaces. In this case, the subprogram is | |
9155 | -- declared within the scope of a protected or a task type. | |
9156 | ||
9157 | if Present (Scope (Def_Id)) | |
9158 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
9159 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
9160 | then | |
9161 | Typ := Scope (Def_Id); | |
9162 | In_Scope := True; | |
9163 | ||
8aa15e3b | 9164 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 9165 | -- has no formals. |
8aa15e3b JM |
9166 | |
9167 | elsif No (First_Formal (Def_Id)) then | |
9168 | return; | |
5d37ba92 | 9169 | |
8aa15e3b | 9170 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 9171 | -- concurrent type. |
5d37ba92 | 9172 | |
8aa15e3b JM |
9173 | else |
9174 | Typ := Etype (First_Formal (Def_Id)); | |
9175 | ||
9176 | if Is_Access_Type (Typ) then | |
9177 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
9178 | end if; |
9179 | ||
8aa15e3b JM |
9180 | if Is_Concurrent_Type (Typ) |
9181 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 9182 | then |
5d37ba92 ES |
9183 | In_Scope := False; |
9184 | ||
9185 | -- This case occurs when the concurrent type is declared within | |
9186 | -- a generic unit. As a result the corresponding record has been | |
9187 | -- built and used as the type of the first formal, we just have | |
9188 | -- to retrieve the corresponding concurrent type. | |
9189 | ||
8aa15e3b | 9190 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 9191 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 9192 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 9193 | then |
8aa15e3b | 9194 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
9195 | In_Scope := False; |
9196 | ||
9197 | else | |
9198 | return; | |
9199 | end if; | |
8aa15e3b JM |
9200 | end if; |
9201 | ||
9202 | -- There is no overriding to check if is an inherited operation in a | |
9203 | -- type derivation on for a generic actual. | |
9204 | ||
9205 | Collect_Interfaces (Typ, Ifaces_List); | |
9206 | ||
9207 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
9208 | return; |
9209 | end if; | |
9210 | ||
8aa15e3b JM |
9211 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
9212 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 9213 | |
8aa15e3b JM |
9214 | declare |
9215 | Candidate : Entity_Id := Empty; | |
9216 | Hom : Entity_Id := Empty; | |
8aa15e3b JM |
9217 | Subp : Entity_Id := Empty; |
9218 | ||
9219 | begin | |
4adf3c50 | 9220 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
9221 | -- overridden subprogram that belongs to an implemented |
9222 | -- interface. | |
9223 | ||
9224 | Hom := Current_Entity_In_Scope (Def_Id); | |
9225 | while Present (Hom) loop | |
9226 | Subp := Hom; | |
9227 | ||
15e4986c JM |
9228 | if Subp = Def_Id |
9229 | or else not Is_Overloadable (Subp) | |
9230 | or else not Is_Primitive (Subp) | |
9231 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 9232 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 9233 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 9234 | then |
15e4986c | 9235 | null; |
8aa15e3b | 9236 | |
15e4986c | 9237 | -- Entries and procedures can override abstract or null |
4adf3c50 | 9238 | -- interface procedures. |
8aa15e3b | 9239 | |
15e4986c | 9240 | elsif (Ekind (Def_Id) = E_Procedure |
8fde064e | 9241 | or else Ekind (Def_Id) = E_Entry) |
8aa15e3b | 9242 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
9243 | and then Matches_Prefixed_View_Profile |
9244 | (Parameter_Specifications (Parent (Def_Id)), | |
9245 | Parameter_Specifications (Parent (Subp))) | |
9246 | then | |
9247 | Candidate := Subp; | |
9248 | ||
15e4986c JM |
9249 | -- For an overridden subprogram Subp, check whether the mode |
9250 | -- of its first parameter is correct depending on the kind | |
9251 | -- of synchronized type. | |
8aa15e3b | 9252 | |
15e4986c JM |
9253 | declare |
9254 | Formal : constant Node_Id := First_Formal (Candidate); | |
9255 | ||
9256 | begin | |
9257 | -- In order for an entry or a protected procedure to | |
9258 | -- override, the first parameter of the overridden | |
9259 | -- routine must be of mode "out", "in out" or | |
9260 | -- access-to-variable. | |
9261 | ||
8fde064e | 9262 | if Ekind_In (Candidate, E_Entry, E_Procedure) |
15e4986c JM |
9263 | and then Is_Protected_Type (Typ) |
9264 | and then Ekind (Formal) /= E_In_Out_Parameter | |
9265 | and then Ekind (Formal) /= E_Out_Parameter | |
8fde064e AC |
9266 | and then Nkind (Parameter_Type (Parent (Formal))) /= |
9267 | N_Access_Definition | |
15e4986c JM |
9268 | then |
9269 | null; | |
9270 | ||
9271 | -- All other cases are OK since a task entry or routine | |
9272 | -- does not have a restriction on the mode of the first | |
9273 | -- parameter of the overridden interface routine. | |
9274 | ||
9275 | else | |
9276 | Overridden_Subp := Candidate; | |
9277 | return; | |
9278 | end if; | |
9279 | end; | |
8aa15e3b JM |
9280 | |
9281 | -- Functions can override abstract interface functions | |
9282 | ||
9283 | elsif Ekind (Def_Id) = E_Function | |
9284 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
9285 | and then Matches_Prefixed_View_Profile |
9286 | (Parameter_Specifications (Parent (Def_Id)), | |
9287 | Parameter_Specifications (Parent (Subp))) | |
9288 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
9289 | Etype (Result_Definition (Parent (Subp))) | |
9290 | then | |
273123a4 AC |
9291 | Candidate := Subp; |
9292 | ||
9293 | -- If an inherited subprogram is implemented by a protected | |
9294 | -- function, then the first parameter of the inherited | |
9295 | -- subprogram shall be of mode in, but not an | |
9296 | -- access-to-variable parameter (RM 9.4(11/9) | |
9297 | ||
9298 | if Present (First_Formal (Subp)) | |
9299 | and then Ekind (First_Formal (Subp)) = E_In_Parameter | |
9300 | and then | |
9301 | (not Is_Access_Type (Etype (First_Formal (Subp))) | |
9302 | or else | |
9303 | Is_Access_Constant (Etype (First_Formal (Subp)))) | |
9304 | then | |
9305 | Overridden_Subp := Subp; | |
9306 | return; | |
9307 | end if; | |
8aa15e3b JM |
9308 | end if; |
9309 | ||
9310 | Hom := Homonym (Hom); | |
9311 | end loop; | |
9312 | ||
4adf3c50 AC |
9313 | -- After examining all candidates for overriding, we are left with |
9314 | -- the best match which is a mode incompatible interface routine. | |
8aa15e3b | 9315 | |
273123a4 AC |
9316 | if In_Scope and then Present (Candidate) then |
9317 | Error_Msg_PT (Def_Id, Candidate); | |
5d37ba92 | 9318 | end if; |
8aa15e3b JM |
9319 | |
9320 | Overridden_Subp := Candidate; | |
9321 | return; | |
9322 | end; | |
5d37ba92 ES |
9323 | end Check_Synchronized_Overriding; |
9324 | ||
9325 | ---------------------------- | |
9326 | -- Is_Private_Declaration -- | |
9327 | ---------------------------- | |
9328 | ||
9329 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
9330 | Priv_Decls : List_Id; | |
9331 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
9332 | ||
9333 | begin | |
9334 | if Is_Package_Or_Generic_Package (Current_Scope) | |
9335 | and then In_Private_Part (Current_Scope) | |
9336 | then | |
9337 | Priv_Decls := | |
d12b19fa | 9338 | Private_Declarations (Package_Specification (Current_Scope)); |
5d37ba92 ES |
9339 | |
9340 | return In_Package_Body (Current_Scope) | |
9341 | or else | |
9342 | (Is_List_Member (Decl) | |
a4901c08 | 9343 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 9344 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
9345 | and then not |
9346 | Is_Compilation_Unit | |
9347 | (Defining_Entity (Parent (Decl))) | |
9348 | and then List_Containing (Parent (Parent (Decl))) = | |
9349 | Priv_Decls); | |
5d37ba92 ES |
9350 | else |
9351 | return False; | |
9352 | end if; | |
9353 | end Is_Private_Declaration; | |
996ae0b0 | 9354 | |
2ddc2000 AC |
9355 | -------------------------- |
9356 | -- Is_Overriding_Alias -- | |
9357 | -------------------------- | |
9358 | ||
9359 | function Is_Overriding_Alias | |
9360 | (Old_E : Entity_Id; | |
9361 | New_E : Entity_Id) return Boolean | |
9362 | is | |
9363 | AO : constant Entity_Id := Alias (Old_E); | |
9364 | AN : constant Entity_Id := Alias (New_E); | |
2ddc2000 AC |
9365 | begin |
9366 | return Scope (AO) /= Scope (AN) | |
9367 | or else No (DTC_Entity (AO)) | |
9368 | or else No (DTC_Entity (AN)) | |
9369 | or else DT_Position (AO) = DT_Position (AN); | |
9370 | end Is_Overriding_Alias; | |
9371 | ||
996ae0b0 RK |
9372 | -- Start of processing for New_Overloaded_Entity |
9373 | ||
9374 | begin | |
fbf5a39b AC |
9375 | -- We need to look for an entity that S may override. This must be a |
9376 | -- homonym in the current scope, so we look for the first homonym of | |
9377 | -- S in the current scope as the starting point for the search. | |
9378 | ||
9379 | E := Current_Entity_In_Scope (S); | |
9380 | ||
947430d5 AC |
9381 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
9382 | -- They are directly added to the list of primitive operations of | |
9383 | -- Derived_Type, unless this is a rederivation in the private part | |
9384 | -- of an operation that was already derived in the visible part of | |
9385 | -- the current package. | |
9386 | ||
0791fbe9 | 9387 | if Ada_Version >= Ada_2005 |
947430d5 AC |
9388 | and then Present (Derived_Type) |
9389 | and then Present (Alias (S)) | |
9390 | and then Is_Dispatching_Operation (Alias (S)) | |
9391 | and then Present (Find_Dispatching_Type (Alias (S))) | |
9392 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
9393 | then | |
9394 | -- For private types, when the full-view is processed we propagate to | |
9395 | -- the full view the non-overridden entities whose attribute "alias" | |
9396 | -- references an interface primitive. These entities were added by | |
9397 | -- Derive_Subprograms to ensure that interface primitives are | |
9398 | -- covered. | |
9399 | ||
9400 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
9401 | -- internal entity that links an interface primitive with its | |
9402 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 9403 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
9404 | |
9405 | if Inside_Freezing_Actions = 0 | |
9406 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
9407 | and then In_Private_Part (Current_Scope) | |
9408 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
9409 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
9410 | and then Full_View (Defining_Identifier (Parent (E))) | |
9411 | = Defining_Identifier (Parent (S)) | |
9412 | and then Alias (E) = Alias (S) | |
9413 | then | |
9414 | Check_Operation_From_Private_View (S, E); | |
9415 | Set_Is_Dispatching_Operation (S); | |
9416 | ||
9417 | -- Common case | |
9418 | ||
9419 | else | |
9420 | Enter_Overloaded_Entity (S); | |
9421 | Check_Dispatching_Operation (S, Empty); | |
9422 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
9423 | end if; | |
9424 | ||
9425 | return; | |
9426 | end if; | |
9427 | ||
fbf5a39b AC |
9428 | -- If there is no homonym then this is definitely not overriding |
9429 | ||
996ae0b0 RK |
9430 | if No (E) then |
9431 | Enter_Overloaded_Entity (S); | |
9432 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9433 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 9434 | |
2995860f AC |
9435 | -- If subprogram has an explicit declaration, check whether it has an |
9436 | -- overriding indicator. | |
758c442c | 9437 | |
ec4867fa | 9438 | if Comes_From_Source (S) then |
8aa15e3b | 9439 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
9440 | |
9441 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
9442 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 9443 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
9444 | -- overriding indicator. |
9445 | ||
9446 | if Ada_Version >= Ada_2012 | |
9447 | and then No (Overridden_Subp) | |
9448 | and then Is_Dispatching_Operation (S) | |
038140ed | 9449 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
9450 | then |
9451 | Overridden_Subp := Overridden_Operation (S); | |
9452 | end if; | |
9453 | ||
5d37ba92 ES |
9454 | Check_Overriding_Indicator |
9455 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
241ebe89 HK |
9456 | |
9457 | -- The Ghost policy in effect at the point of declaration of a | |
9458 | -- parent subprogram and an overriding subprogram must match | |
9459 | -- (SPARK RM 6.9(17)). | |
9460 | ||
9461 | Check_Ghost_Overriding (S, Overridden_Subp); | |
758c442c GD |
9462 | end if; |
9463 | ||
fbf5a39b AC |
9464 | -- If there is a homonym that is not overloadable, then we have an |
9465 | -- error, except for the special cases checked explicitly below. | |
9466 | ||
996ae0b0 RK |
9467 | elsif not Is_Overloadable (E) then |
9468 | ||
9469 | -- Check for spurious conflict produced by a subprogram that has the | |
9470 | -- same name as that of the enclosing generic package. The conflict | |
9471 | -- occurs within an instance, between the subprogram and the renaming | |
9472 | -- declaration for the package. After the subprogram, the package | |
9473 | -- renaming declaration becomes hidden. | |
9474 | ||
9475 | if Ekind (E) = E_Package | |
9476 | and then Present (Renamed_Object (E)) | |
9477 | and then Renamed_Object (E) = Current_Scope | |
9478 | and then Nkind (Parent (Renamed_Object (E))) = | |
9479 | N_Package_Specification | |
9480 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
9481 | then | |
9482 | Set_Is_Hidden (E); | |
9483 | Set_Is_Immediately_Visible (E, False); | |
9484 | Enter_Overloaded_Entity (S); | |
9485 | Set_Homonym (S, Homonym (E)); | |
9486 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9487 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
9488 | |
9489 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
9490 | -- declaration. However if it is dispatching, it must appear in the |
9491 | -- dispatch table anyway, because it can be dispatched to even if it | |
9492 | -- cannot be called directly. | |
996ae0b0 | 9493 | |
4adf3c50 | 9494 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
9495 | Set_Scope (S, Current_Scope); |
9496 | ||
9497 | if Is_Dispatching_Operation (Alias (S)) then | |
9498 | Check_Dispatching_Operation (S, Empty); | |
9499 | end if; | |
9500 | ||
9501 | return; | |
9502 | ||
9503 | else | |
9504 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 9505 | |
f3d57416 | 9506 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
9507 | |
9508 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
9509 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
9510 | Error_Msg_N ("\& conflicts with declaration#", S); | |
9511 | else | |
9512 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
9513 | end if; |
9514 | ||
9515 | return; | |
9516 | end if; | |
9517 | ||
fbf5a39b AC |
9518 | -- E exists and is overloadable |
9519 | ||
996ae0b0 | 9520 | else |
8aa15e3b | 9521 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 9522 | |
82c80734 RD |
9523 | -- Loop through E and its homonyms to determine if any of them is |
9524 | -- the candidate for overriding by S. | |
996ae0b0 RK |
9525 | |
9526 | while Present (E) loop | |
fbf5a39b AC |
9527 | |
9528 | -- Definitely not interesting if not in the current scope | |
9529 | ||
996ae0b0 RK |
9530 | if Scope (E) /= Current_Scope then |
9531 | null; | |
9532 | ||
aca90db9 AC |
9533 | -- A function can overload the name of an abstract state. The |
9534 | -- state can be viewed as a function with a profile that cannot | |
9535 | -- be matched by anything. | |
9536 | ||
9537 | elsif Ekind (S) = E_Function | |
9538 | and then Ekind (E) = E_Abstract_State | |
9539 | then | |
9540 | Enter_Overloaded_Entity (S); | |
9541 | return; | |
9542 | ||
2995860f AC |
9543 | -- Ada 2012 (AI05-0165): For internally generated bodies of null |
9544 | -- procedures locate the internally generated spec. We enforce | |
9545 | -- mode conformance since a tagged type may inherit from | |
9546 | -- interfaces several null primitives which differ only in | |
9547 | -- the mode of the formals. | |
25ebc085 AC |
9548 | |
9549 | elsif not Comes_From_Source (S) | |
9550 | and then Is_Null_Procedure (S) | |
9551 | and then not Mode_Conformant (E, S) | |
9552 | then | |
9553 | null; | |
9554 | ||
fbf5a39b AC |
9555 | -- Check if we have type conformance |
9556 | ||
ec4867fa | 9557 | elsif Type_Conformant (E, S) then |
c8ef728f | 9558 | |
82c80734 RD |
9559 | -- If the old and new entities have the same profile and one |
9560 | -- is not the body of the other, then this is an error, unless | |
9561 | -- one of them is implicitly declared. | |
996ae0b0 RK |
9562 | |
9563 | -- There are some cases when both can be implicit, for example | |
9564 | -- when both a literal and a function that overrides it are | |
f3d57416 | 9565 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 9566 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 9567 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 9568 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
9569 | -- the former, and the literal is always the former. In the |
9570 | -- odd case where both are derived operations declared at the | |
9571 | -- same point, both operations should be declared, and in that | |
9572 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
9573 | -- part. This can only occur for certain obscure cases in |
9574 | -- instances, when an operation on a type derived from a formal | |
9575 | -- private type does not override a homograph inherited from | |
9576 | -- the actual. In subsequent derivations of such a type, the | |
9577 | -- DT positions of these operations remain distinct, if they | |
9578 | -- have been set. | |
996ae0b0 RK |
9579 | |
9580 | if Present (Alias (S)) | |
9581 | and then (No (Alias (E)) | |
9582 | or else Comes_From_Source (E) | |
2ddc2000 | 9583 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
9584 | or else |
9585 | (Is_Dispatching_Operation (E) | |
84c0a895 | 9586 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 9587 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 9588 | then |
82c80734 RD |
9589 | -- When an derived operation is overloaded it may be due to |
9590 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
9591 | -- re-inherits. It has to be dealt with. |
9592 | ||
e660dbf7 | 9593 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
9594 | and then In_Private_Part (Current_Scope) |
9595 | then | |
9596 | Check_Operation_From_Private_View (S, E); | |
9597 | end if; | |
9598 | ||
038140ed AC |
9599 | -- In any case the implicit operation remains hidden by the |
9600 | -- existing declaration, which is overriding. Indicate that | |
9601 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 9602 | |
038140ed | 9603 | if Present (Alias (S)) then |
039538bc AC |
9604 | Set_Overridden_Operation (E, Alias (S)); |
9605 | Inherit_Subprogram_Contract (E, Alias (S)); | |
9606 | ||
038140ed | 9607 | else |
039538bc AC |
9608 | Set_Overridden_Operation (E, S); |
9609 | Inherit_Subprogram_Contract (E, S); | |
038140ed | 9610 | end if; |
758c442c GD |
9611 | |
9612 | if Comes_From_Source (E) then | |
5d37ba92 | 9613 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
241ebe89 HK |
9614 | |
9615 | -- The Ghost policy in effect at the point of declaration | |
9616 | -- of a parent subprogram and an overriding subprogram | |
9617 | -- must match (SPARK RM 6.9(17)). | |
9618 | ||
9619 | Check_Ghost_Overriding (E, S); | |
758c442c GD |
9620 | end if; |
9621 | ||
996ae0b0 RK |
9622 | return; |
9623 | ||
26a43556 AC |
9624 | -- Within an instance, the renaming declarations for actual |
9625 | -- subprograms may become ambiguous, but they do not hide each | |
9626 | -- other. | |
996ae0b0 RK |
9627 | |
9628 | elsif Ekind (E) /= E_Entry | |
9629 | and then not Comes_From_Source (E) | |
9630 | and then not Is_Generic_Instance (E) | |
9631 | and then (Present (Alias (E)) | |
9632 | or else Is_Intrinsic_Subprogram (E)) | |
9633 | and then (not In_Instance | |
9634 | or else No (Parent (E)) | |
9635 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 9636 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 9637 | then |
26a43556 AC |
9638 | -- A subprogram child unit is not allowed to override an |
9639 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
9640 | |
9641 | if Is_Child_Unit (S) then | |
9642 | Error_Msg_N | |
9643 | ("child unit overrides inherited subprogram in parent", | |
9644 | S); | |
9645 | return; | |
9646 | end if; | |
9647 | ||
9648 | if Is_Non_Overriding_Operation (E, S) then | |
9649 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 9650 | |
c8ef728f | 9651 | if No (Derived_Type) |
996ae0b0 RK |
9652 | or else Is_Tagged_Type (Derived_Type) |
9653 | then | |
9654 | Check_Dispatching_Operation (S, Empty); | |
9655 | end if; | |
9656 | ||
9657 | return; | |
9658 | end if; | |
9659 | ||
9660 | -- E is a derived operation or an internal operator which | |
9661 | -- is being overridden. Remove E from further visibility. | |
9662 | -- Furthermore, if E is a dispatching operation, it must be | |
9663 | -- replaced in the list of primitive operations of its type | |
9664 | -- (see Override_Dispatching_Operation). | |
9665 | ||
ec4867fa | 9666 | Overridden_Subp := E; |
758c442c | 9667 | |
996ae0b0 RK |
9668 | declare |
9669 | Prev : Entity_Id; | |
9670 | ||
9671 | begin | |
9672 | Prev := First_Entity (Current_Scope); | |
8fde064e | 9673 | while Present (Prev) and then Next_Entity (Prev) /= E loop |
996ae0b0 RK |
9674 | Next_Entity (Prev); |
9675 | end loop; | |
9676 | ||
9677 | -- It is possible for E to be in the current scope and | |
9678 | -- yet not in the entity chain. This can only occur in a | |
9679 | -- generic context where E is an implicit concatenation | |
9680 | -- in the formal part, because in a generic body the | |
9681 | -- entity chain starts with the formals. | |
9682 | ||
948ed277 AC |
9683 | -- In GNATprove mode, a wrapper for an operation with |
9684 | -- axiomatization may be a homonym of another declaration | |
9685 | -- for an actual subprogram (needs refinement ???). | |
9686 | ||
9687 | if No (Prev) then | |
9688 | if In_Instance | |
9689 | and then GNATprove_Mode | |
9690 | and then | |
9691 | Nkind (Original_Node (Unit_Declaration_Node (S))) = | |
9692 | N_Subprogram_Renaming_Declaration | |
9693 | then | |
9694 | return; | |
9695 | else | |
9696 | pragma Assert (Chars (E) = Name_Op_Concat); | |
9697 | null; | |
9698 | end if; | |
9699 | end if; | |
996ae0b0 RK |
9700 | |
9701 | -- E must be removed both from the entity_list of the | |
948ed277 | 9702 | -- current scope, and from the visibility chain. |
996ae0b0 RK |
9703 | |
9704 | if Debug_Flag_E then | |
9705 | Write_Str ("Override implicit operation "); | |
9706 | Write_Int (Int (E)); | |
9707 | Write_Eol; | |
9708 | end if; | |
9709 | ||
9710 | -- If E is a predefined concatenation, it stands for four | |
9711 | -- different operations. As a result, a single explicit | |
9712 | -- declaration does not hide it. In a possible ambiguous | |
9713 | -- situation, Disambiguate chooses the user-defined op, | |
9714 | -- so it is correct to retain the previous internal one. | |
9715 | ||
9716 | if Chars (E) /= Name_Op_Concat | |
9717 | or else Ekind (E) /= E_Operator | |
9718 | then | |
9719 | -- For nondispatching derived operations that are | |
9720 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
9721 | -- part of a package, we retain the derived subprogram |
9722 | -- but mark it as not immediately visible. If the | |
9723 | -- derived operation was declared in the visible part | |
9724 | -- then this ensures that it will still be visible | |
9725 | -- outside the package with the proper signature | |
9726 | -- (calls from outside must also be directed to this | |
9727 | -- version rather than the overriding one, unlike the | |
9728 | -- dispatching case). Calls from inside the package | |
9729 | -- will still resolve to the overriding subprogram | |
9730 | -- since the derived one is marked as not visible | |
9731 | -- within the package. | |
996ae0b0 RK |
9732 | |
9733 | -- If the private operation is dispatching, we achieve | |
9734 | -- the overriding by keeping the implicit operation | |
9865d858 | 9735 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
9736 | -- this fashion the proper body is executed in all |
9737 | -- cases, but the original signature is used outside | |
9738 | -- of the package. | |
9739 | ||
9740 | -- If the overriding is not in the private part, we | |
9741 | -- remove the implicit operation altogether. | |
9742 | ||
9743 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
9744 | if not Is_Dispatching_Operation (E) then |
9745 | Set_Is_Immediately_Visible (E, False); | |
9746 | else | |
e895b435 | 9747 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 9748 | -- so nothing else needs to be done here. |
996ae0b0 RK |
9749 | |
9750 | null; | |
9751 | end if; | |
996ae0b0 | 9752 | |
fbf5a39b AC |
9753 | else |
9754 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
9755 | |
9756 | if E = Current_Entity (E) then | |
9757 | Prev_Vis := Empty; | |
9758 | else | |
9759 | Prev_Vis := Current_Entity (E); | |
9760 | while Homonym (Prev_Vis) /= E loop | |
9761 | Prev_Vis := Homonym (Prev_Vis); | |
9762 | end loop; | |
9763 | end if; | |
9764 | ||
9765 | if Prev_Vis /= Empty then | |
9766 | ||
9767 | -- Skip E in the visibility chain | |
9768 | ||
9769 | Set_Homonym (Prev_Vis, Homonym (E)); | |
9770 | ||
9771 | else | |
9772 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
9773 | end if; | |
9774 | ||
9775 | Set_Next_Entity (Prev, Next_Entity (E)); | |
9776 | ||
9777 | if No (Next_Entity (Prev)) then | |
9778 | Set_Last_Entity (Current_Scope, Prev); | |
9779 | end if; | |
996ae0b0 RK |
9780 | end if; |
9781 | end if; | |
9782 | ||
9783 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
9784 | |
9785 | -- For entities generated by Derive_Subprograms the | |
9786 | -- overridden operation is the inherited primitive | |
9787 | -- (which is available through the attribute alias). | |
9788 | ||
9789 | if not (Comes_From_Source (E)) | |
9790 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
9791 | and then Find_Dispatching_Type (E) = |
9792 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
9793 | and then Present (Alias (E)) |
9794 | and then Comes_From_Source (Alias (E)) | |
9795 | then | |
039538bc AC |
9796 | Set_Overridden_Operation (S, Alias (E)); |
9797 | Inherit_Subprogram_Contract (S, Alias (E)); | |
2fe829ae | 9798 | |
6320f5e1 AC |
9799 | -- Normal case of setting entity as overridden |
9800 | ||
9801 | -- Note: Static_Initialization and Overridden_Operation | |
9802 | -- attributes use the same field in subprogram entities. | |
9803 | -- Static_Initialization is only defined for internal | |
9804 | -- initialization procedures, where Overridden_Operation | |
9805 | -- is irrelevant. Therefore the setting of this attribute | |
9806 | -- must check whether the target is an init_proc. | |
9807 | ||
2fe829ae | 9808 | elsif not Is_Init_Proc (S) then |
039538bc AC |
9809 | Set_Overridden_Operation (S, E); |
9810 | Inherit_Subprogram_Contract (S, E); | |
1c1289e7 AC |
9811 | end if; |
9812 | ||
5d37ba92 | 9813 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 9814 | |
241ebe89 HK |
9815 | -- The Ghost policy in effect at the point of declaration |
9816 | -- of a parent subprogram and an overriding subprogram | |
9817 | -- must match (SPARK RM 6.9(17)). | |
9818 | ||
9819 | Check_Ghost_Overriding (S, E); | |
9820 | ||
fc53fe76 | 9821 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
9822 | -- expanded to override an inherited null procedure, or a |
9823 | -- predefined dispatching primitive then indicate that E | |
038140ed | 9824 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
9825 | |
9826 | if Comes_From_Source (S) | |
9827 | or else | |
9828 | (Present (Parent (S)) | |
9829 | and then | |
9830 | Nkind (Parent (S)) = N_Procedure_Specification | |
9831 | and then | |
9832 | Null_Present (Parent (S))) | |
38ef8ebe AC |
9833 | or else |
9834 | (Present (Alias (E)) | |
f16e8df9 RD |
9835 | and then |
9836 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 9837 | then |
c8ef728f | 9838 | if Present (Alias (E)) then |
039538bc AC |
9839 | Set_Overridden_Operation (S, Alias (E)); |
9840 | Inherit_Subprogram_Contract (S, Alias (E)); | |
41251c60 JM |
9841 | end if; |
9842 | end if; | |
9843 | ||
996ae0b0 | 9844 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 9845 | |
82c80734 | 9846 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 9847 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
9848 | |
9849 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
9850 | Check_Dispatching_Operation (S, E); |
9851 | ||
996ae0b0 RK |
9852 | else |
9853 | Check_Dispatching_Operation (S, Empty); | |
9854 | end if; | |
9855 | ||
5d37ba92 ES |
9856 | Check_For_Primitive_Subprogram |
9857 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
9858 | goto Check_Inequality; |
9859 | end; | |
9860 | ||
9861 | -- Apparent redeclarations in instances can occur when two | |
9862 | -- formal types get the same actual type. The subprograms in | |
9863 | -- in the instance are legal, even if not callable from the | |
9864 | -- outside. Calls from within are disambiguated elsewhere. | |
9865 | -- For dispatching operations in the visible part, the usual | |
9866 | -- rules apply, and operations with the same profile are not | |
9867 | -- legal (B830001). | |
9868 | ||
9869 | elsif (In_Instance_Visible_Part | |
9870 | and then not Is_Dispatching_Operation (E)) | |
9871 | or else In_Instance_Not_Visible | |
9872 | then | |
9873 | null; | |
9874 | ||
9875 | -- Here we have a real error (identical profile) | |
9876 | ||
9877 | else | |
9878 | Error_Msg_Sloc := Sloc (E); | |
9879 | ||
9880 | -- Avoid cascaded errors if the entity appears in | |
9881 | -- subsequent calls. | |
9882 | ||
9883 | Set_Scope (S, Current_Scope); | |
9884 | ||
5d37ba92 ES |
9885 | -- Generate error, with extra useful warning for the case |
9886 | -- of a generic instance with no completion. | |
996ae0b0 RK |
9887 | |
9888 | if Is_Generic_Instance (S) | |
9889 | and then not Has_Completion (E) | |
9890 | then | |
9891 | Error_Msg_N | |
5d37ba92 ES |
9892 | ("instantiation cannot provide body for&", S); |
9893 | Error_Msg_N ("\& conflicts with declaration#", S); | |
9894 | else | |
9895 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
9896 | end if; |
9897 | ||
9898 | return; | |
9899 | end if; | |
9900 | ||
9901 | else | |
c8ef728f ES |
9902 | -- If one subprogram has an access parameter and the other |
9903 | -- a parameter of an access type, calls to either might be | |
9904 | -- ambiguous. Verify that parameters match except for the | |
9905 | -- access parameter. | |
9906 | ||
9907 | if May_Hide_Profile then | |
9908 | declare | |
ec4867fa ES |
9909 | F1 : Entity_Id; |
9910 | F2 : Entity_Id; | |
8dbd1460 | 9911 | |
c8ef728f ES |
9912 | begin |
9913 | F1 := First_Formal (S); | |
9914 | F2 := First_Formal (E); | |
9915 | while Present (F1) and then Present (F2) loop | |
9916 | if Is_Access_Type (Etype (F1)) then | |
9917 | if not Is_Access_Type (Etype (F2)) | |
9918 | or else not Conforming_Types | |
9919 | (Designated_Type (Etype (F1)), | |
9920 | Designated_Type (Etype (F2)), | |
9921 | Type_Conformant) | |
9922 | then | |
9923 | May_Hide_Profile := False; | |
9924 | end if; | |
9925 | ||
9926 | elsif | |
9927 | not Conforming_Types | |
9928 | (Etype (F1), Etype (F2), Type_Conformant) | |
9929 | then | |
9930 | May_Hide_Profile := False; | |
9931 | end if; | |
9932 | ||
9933 | Next_Formal (F1); | |
9934 | Next_Formal (F2); | |
9935 | end loop; | |
9936 | ||
9937 | if May_Hide_Profile | |
9938 | and then No (F1) | |
9939 | and then No (F2) | |
9940 | then | |
dbfeb4fa | 9941 | Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
c8ef728f ES |
9942 | end if; |
9943 | end; | |
9944 | end if; | |
996ae0b0 RK |
9945 | end if; |
9946 | ||
996ae0b0 RK |
9947 | E := Homonym (E); |
9948 | end loop; | |
9949 | ||
9950 | -- On exit, we know that S is a new entity | |
9951 | ||
9952 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
9953 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
9954 | Check_Overriding_Indicator | |
9955 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 9956 | |
241ebe89 HK |
9957 | -- The Ghost policy in effect at the point of declaration of a parent |
9958 | -- subprogram and an overriding subprogram must match | |
9959 | -- (SPARK RM 6.9(17)). | |
9960 | ||
9961 | Check_Ghost_Overriding (S, Overridden_Subp); | |
9962 | ||
c4d67e2d | 9963 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 9964 | |
c4d67e2d AC |
9965 | if Nkind (S) /= N_Defining_Operator_Symbol then |
9966 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
ce5ba43a | 9967 | Check_SPARK_05_Restriction |
c4d67e2d AC |
9968 | ("overloading not allowed with entity#", S); |
9969 | end if; | |
8ed68165 | 9970 | |
82c80734 RD |
9971 | -- If S is a derived operation for an untagged type then by |
9972 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
9973 | -- operation was dispatching), so Check_Dispatching_Operation is not |
9974 | -- called in that case. | |
996ae0b0 | 9975 | |
c8ef728f | 9976 | if No (Derived_Type) |
996ae0b0 RK |
9977 | or else Is_Tagged_Type (Derived_Type) |
9978 | then | |
9979 | Check_Dispatching_Operation (S, Empty); | |
9980 | end if; | |
9981 | end if; | |
9982 | ||
82c80734 RD |
9983 | -- If this is a user-defined equality operator that is not a derived |
9984 | -- subprogram, create the corresponding inequality. If the operation is | |
9985 | -- dispatching, the expansion is done elsewhere, and we do not create | |
9986 | -- an explicit inequality operation. | |
996ae0b0 RK |
9987 | |
9988 | <<Check_Inequality>> | |
9989 | if Chars (S) = Name_Op_Eq | |
9990 | and then Etype (S) = Standard_Boolean | |
9991 | and then Present (Parent (S)) | |
9992 | and then not Is_Dispatching_Operation (S) | |
9993 | then | |
9994 | Make_Inequality_Operator (S); | |
b2834fbd | 9995 | Check_Untagged_Equality (S); |
996ae0b0 | 9996 | end if; |
996ae0b0 RK |
9997 | end New_Overloaded_Entity; |
9998 | ||
9999 | --------------------- | |
10000 | -- Process_Formals -- | |
10001 | --------------------- | |
10002 | ||
10003 | procedure Process_Formals | |
07fc65c4 | 10004 | (T : List_Id; |
996ae0b0 RK |
10005 | Related_Nod : Node_Id) |
10006 | is | |
c8d3b4ff | 10007 | Context : constant Node_Id := Parent (Parent (T)); |
996ae0b0 RK |
10008 | Param_Spec : Node_Id; |
10009 | Formal : Entity_Id; | |
10010 | Formal_Type : Entity_Id; | |
10011 | Default : Node_Id; | |
10012 | Ptype : Entity_Id; | |
10013 | ||
800621e0 RD |
10014 | Num_Out_Params : Nat := 0; |
10015 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 10016 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 10017 | |
7b56a91b | 10018 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
950d217a AC |
10019 | -- Determine whether an access type designates a type coming from a |
10020 | -- limited view. | |
10021 | ||
07fc65c4 | 10022 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
10023 | -- Check whether the default has a class-wide type. After analysis the |
10024 | -- default has the type of the formal, so we must also check explicitly | |
10025 | -- for an access attribute. | |
07fc65c4 | 10026 | |
7b56a91b AC |
10027 | ---------------------------------- |
10028 | -- Designates_From_Limited_With -- | |
10029 | ---------------------------------- | |
950d217a | 10030 | |
7b56a91b | 10031 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
950d217a AC |
10032 | Desig : Entity_Id := Typ; |
10033 | ||
10034 | begin | |
10035 | if Is_Access_Type (Desig) then | |
10036 | Desig := Directly_Designated_Type (Desig); | |
10037 | end if; | |
10038 | ||
10039 | if Is_Class_Wide_Type (Desig) then | |
10040 | Desig := Root_Type (Desig); | |
10041 | end if; | |
10042 | ||
10043 | return | |
7b56a91b AC |
10044 | Ekind (Desig) = E_Incomplete_Type |
10045 | and then From_Limited_With (Desig); | |
10046 | end Designates_From_Limited_With; | |
950d217a | 10047 | |
07fc65c4 GB |
10048 | --------------------------- |
10049 | -- Is_Class_Wide_Default -- | |
10050 | --------------------------- | |
10051 | ||
10052 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
10053 | begin | |
10054 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
10055 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
10056 | and then Attribute_Name (D) = Name_Access |
10057 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
10058 | end Is_Class_Wide_Default; |
10059 | ||
10060 | -- Start of processing for Process_Formals | |
10061 | ||
996ae0b0 RK |
10062 | begin |
10063 | -- In order to prevent premature use of the formals in the same formal | |
10064 | -- part, the Ekind is left undefined until all default expressions are | |
10065 | -- analyzed. The Ekind is established in a separate loop at the end. | |
10066 | ||
10067 | Param_Spec := First (T); | |
996ae0b0 | 10068 | while Present (Param_Spec) loop |
996ae0b0 | 10069 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 10070 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
10071 | Enter_Name (Formal); |
10072 | ||
10073 | -- Case of ordinary parameters | |
10074 | ||
10075 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
10076 | Find_Type (Parameter_Type (Param_Spec)); | |
10077 | Ptype := Parameter_Type (Param_Spec); | |
10078 | ||
10079 | if Ptype = Error then | |
10080 | goto Continue; | |
10081 | end if; | |
10082 | ||
10083 | Formal_Type := Entity (Ptype); | |
10084 | ||
ec4867fa ES |
10085 | if Is_Incomplete_Type (Formal_Type) |
10086 | or else | |
10087 | (Is_Class_Wide_Type (Formal_Type) | |
8fde064e | 10088 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
996ae0b0 | 10089 | then |
93bcda23 AC |
10090 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
10091 | -- primitive operations, as long as their completion is | |
10092 | -- in the same declarative part. If in the private part | |
10093 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
10094 | -- Check is done on package exit. For access to subprograms, |
10095 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 10096 | |
6eddd7b4 AC |
10097 | -- Ada 2012: tagged incomplete types are allowed as generic |
10098 | -- formal types. They do not introduce dependencies and the | |
10099 | -- corresponding generic subprogram does not have a delayed | |
5b6f12c7 AC |
10100 | -- freeze, because it does not need a freeze node. However, |
10101 | -- it is still the case that untagged incomplete types cannot | |
10102 | -- be Taft-amendment types and must be completed in private | |
10103 | -- part, so the subprogram must appear in the list of private | |
a0a10853 AC |
10104 | -- dependents of the type. If the type is class-wide, it is |
10105 | -- not a primitive, but the freezing of the subprogram must | |
10106 | -- also be delayed to force the creation of a freeze node. | |
5b6f12c7 AC |
10107 | |
10108 | if Is_Tagged_Type (Formal_Type) | |
b973629e | 10109 | or else (Ada_Version >= Ada_2012 |
1ebc2612 AC |
10110 | and then not From_Limited_With (Formal_Type) |
10111 | and then not Is_Generic_Type (Formal_Type)) | |
5b6f12c7 | 10112 | then |
93bcda23 | 10113 | if Ekind (Scope (Current_Scope)) = E_Package |
6eddd7b4 | 10114 | and then not Is_Generic_Type (Formal_Type) |
93bcda23 | 10115 | then |
cec29135 ES |
10116 | if not Nkind_In |
10117 | (Parent (T), N_Access_Function_Definition, | |
10118 | N_Access_Procedure_Definition) | |
10119 | then | |
66371f94 AC |
10120 | -- A limited view has no private dependents |
10121 | ||
10122 | if not Is_Class_Wide_Type (Formal_Type) | |
10123 | and then not From_Limited_With (Formal_Type) | |
10124 | then | |
a0a10853 | 10125 | Append_Elmt (Current_Scope, |
66371f94 | 10126 | Private_Dependents (Base_Type (Formal_Type))); |
a0a10853 | 10127 | end if; |
4637729f AC |
10128 | |
10129 | -- Freezing is delayed to ensure that Register_Prim | |
10130 | -- will get called for this operation, which is needed | |
10131 | -- in cases where static dispatch tables aren't built. | |
10132 | -- (Note that the same is done for controlling access | |
10133 | -- parameter cases in function Access_Definition.) | |
10134 | ||
13fa2acb AC |
10135 | if not Is_Thunk (Current_Scope) then |
10136 | Set_Has_Delayed_Freeze (Current_Scope); | |
10137 | end if; | |
cec29135 | 10138 | end if; |
93bcda23 | 10139 | end if; |
fbf5a39b | 10140 | |
0a36105d JM |
10141 | -- Special handling of Value_Type for CIL case |
10142 | ||
10143 | elsif Is_Value_Type (Formal_Type) then | |
10144 | null; | |
10145 | ||
800621e0 RD |
10146 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
10147 | N_Access_Procedure_Definition) | |
996ae0b0 | 10148 | then |
dd386db0 AC |
10149 | -- AI05-0151: Tagged incomplete types are allowed in all |
10150 | -- formal parts. Untagged incomplete types are not allowed | |
b973629e AC |
10151 | -- in bodies. Limited views of either kind are not allowed |
10152 | -- if there is no place at which the non-limited view can | |
10153 | -- become available. | |
a18e3d62 | 10154 | |
1ebc2612 AC |
10155 | -- Incomplete formal untagged types are not allowed in |
10156 | -- subprogram bodies (but are legal in their declarations). | |
c8d3b4ff AC |
10157 | -- This excludes bodies created for null procedures, which |
10158 | -- are basic declarations. | |
1ebc2612 AC |
10159 | |
10160 | if Is_Generic_Type (Formal_Type) | |
10161 | and then not Is_Tagged_Type (Formal_Type) | |
10162 | and then Nkind (Parent (Related_Nod)) = N_Subprogram_Body | |
10163 | then | |
10164 | Error_Msg_N | |
10165 | ("invalid use of formal incomplete type", Param_Spec); | |
dd386db0 | 10166 | |
1ebc2612 | 10167 | elsif Ada_Version >= Ada_2012 then |
b973629e AC |
10168 | if Is_Tagged_Type (Formal_Type) |
10169 | and then (not From_Limited_With (Formal_Type) | |
10170 | or else not In_Package_Body) | |
10171 | then | |
dd386db0 AC |
10172 | null; |
10173 | ||
c8d3b4ff AC |
10174 | elsif Nkind_In (Context, N_Accept_Statement, |
10175 | N_Accept_Alternative, | |
10176 | N_Entry_Body) | |
10177 | or else (Nkind (Context) = N_Subprogram_Body | |
10178 | and then Comes_From_Source (Context)) | |
dd386db0 AC |
10179 | then |
10180 | Error_Msg_NE | |
c8d3b4ff | 10181 | ("invalid use of untagged incomplete type &", |
0f1a6a0b | 10182 | Ptype, Formal_Type); |
dd386db0 AC |
10183 | end if; |
10184 | ||
10185 | else | |
10186 | Error_Msg_NE | |
10187 | ("invalid use of incomplete type&", | |
0f1a6a0b | 10188 | Param_Spec, Formal_Type); |
dd386db0 AC |
10189 | |
10190 | -- Further checks on the legality of incomplete types | |
10191 | -- in formal parts are delayed until the freeze point | |
10192 | -- of the enclosing subprogram or access to subprogram. | |
10193 | end if; | |
996ae0b0 RK |
10194 | end if; |
10195 | ||
10196 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
10197 | Error_Msg_NE |
10198 | ("premature use of&", | |
10199 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
10200 | end if; |
10201 | ||
fecbd779 AC |
10202 | -- Ada 2012 (AI-142): Handle aliased parameters |
10203 | ||
10204 | if Ada_Version >= Ada_2012 | |
10205 | and then Aliased_Present (Param_Spec) | |
10206 | then | |
10207 | Set_Is_Aliased (Formal); | |
10208 | end if; | |
10209 | ||
0ab80019 | 10210 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 10211 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
10212 | -- formal in the enclosing scope. Finally, replace the parameter |
10213 | -- type of the formal with the internal subtype. | |
7324bf49 | 10214 | |
0791fbe9 | 10215 | if Ada_Version >= Ada_2005 |
41251c60 | 10216 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 10217 | then |
ec4867fa | 10218 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 10219 | Error_Msg_N |
0a36105d JM |
10220 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
10221 | ||
ec4867fa ES |
10222 | else |
10223 | if Can_Never_Be_Null (Formal_Type) | |
10224 | and then Comes_From_Source (Related_Nod) | |
10225 | then | |
ed2233dc | 10226 | Error_Msg_NE |
0a36105d | 10227 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 10228 | Param_Spec, Formal_Type); |
ec4867fa | 10229 | end if; |
41251c60 | 10230 | |
ec4867fa ES |
10231 | Formal_Type := |
10232 | Create_Null_Excluding_Itype | |
10233 | (T => Formal_Type, | |
10234 | Related_Nod => Related_Nod, | |
10235 | Scope_Id => Scope (Current_Scope)); | |
0a36105d | 10236 | |
fcf848c4 AC |
10237 | -- If the designated type of the itype is an itype that is |
10238 | -- not frozen yet, we set the Has_Delayed_Freeze attribute | |
10239 | -- on the access subtype, to prevent order-of-elaboration | |
10240 | -- issues in the backend. | |
0a36105d JM |
10241 | |
10242 | -- Example: | |
10243 | -- type T is access procedure; | |
10244 | -- procedure Op (O : not null T); | |
10245 | ||
fcf848c4 AC |
10246 | if Is_Itype (Directly_Designated_Type (Formal_Type)) |
10247 | and then | |
10248 | not Is_Frozen (Directly_Designated_Type (Formal_Type)) | |
10249 | then | |
0a36105d JM |
10250 | Set_Has_Delayed_Freeze (Formal_Type); |
10251 | end if; | |
ec4867fa | 10252 | end if; |
7324bf49 AC |
10253 | end if; |
10254 | ||
996ae0b0 RK |
10255 | -- An access formal type |
10256 | ||
10257 | else | |
10258 | Formal_Type := | |
10259 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 10260 | |
f937473f RD |
10261 | -- No need to continue if we already notified errors |
10262 | ||
10263 | if not Present (Formal_Type) then | |
10264 | return; | |
10265 | end if; | |
10266 | ||
0ab80019 | 10267 | -- Ada 2005 (AI-254) |
7324bf49 | 10268 | |
af4b9434 AC |
10269 | declare |
10270 | AD : constant Node_Id := | |
10271 | Access_To_Subprogram_Definition | |
10272 | (Parameter_Type (Param_Spec)); | |
10273 | begin | |
10274 | if Present (AD) and then Protected_Present (AD) then | |
10275 | Formal_Type := | |
10276 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 10277 | (Param_Spec); |
af4b9434 AC |
10278 | end if; |
10279 | end; | |
996ae0b0 RK |
10280 | end if; |
10281 | ||
10282 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 10283 | |
fecbd779 AC |
10284 | -- Deal with default expression if present |
10285 | ||
fbf5a39b | 10286 | Default := Expression (Param_Spec); |
996ae0b0 RK |
10287 | |
10288 | if Present (Default) then | |
ce5ba43a | 10289 | Check_SPARK_05_Restriction |
fe5d3068 | 10290 | ("default expression is not allowed", Default); |
38171f43 | 10291 | |
996ae0b0 | 10292 | if Out_Present (Param_Spec) then |
ed2233dc | 10293 | Error_Msg_N |
996ae0b0 RK |
10294 | ("default initialization only allowed for IN parameters", |
10295 | Param_Spec); | |
10296 | end if; | |
10297 | ||
10298 | -- Do the special preanalysis of the expression (see section on | |
10299 | -- "Handling of Default Expressions" in the spec of package Sem). | |
10300 | ||
21d27997 | 10301 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 10302 | |
f29b857f ES |
10303 | -- An access to constant cannot be the default for |
10304 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
10305 | |
10306 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
10307 | and then not Is_Access_Constant (Formal_Type) | |
10308 | and then Is_Access_Type (Etype (Default)) | |
10309 | and then Is_Access_Constant (Etype (Default)) | |
10310 | then | |
f29b857f | 10311 | Error_Msg_N |
84c0a895 AC |
10312 | ("formal that is access to variable cannot be initialized " |
10313 | & "with an access-to-constant expression", Default); | |
2eb160f2 ST |
10314 | end if; |
10315 | ||
d8db0bca JM |
10316 | -- Check that the designated type of an access parameter's default |
10317 | -- is not a class-wide type unless the parameter's designated type | |
10318 | -- is also class-wide. | |
996ae0b0 RK |
10319 | |
10320 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
7b56a91b | 10321 | and then not Designates_From_Limited_With (Formal_Type) |
07fc65c4 | 10322 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
10323 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
10324 | then | |
07fc65c4 GB |
10325 | Error_Msg_N |
10326 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 10327 | end if; |
4755cce9 JM |
10328 | |
10329 | -- Check incorrect use of dynamically tagged expressions | |
10330 | ||
10331 | if Is_Tagged_Type (Formal_Type) then | |
10332 | Check_Dynamically_Tagged_Expression | |
10333 | (Expr => Default, | |
10334 | Typ => Formal_Type, | |
10335 | Related_Nod => Default); | |
10336 | end if; | |
996ae0b0 RK |
10337 | end if; |
10338 | ||
41251c60 JM |
10339 | -- Ada 2005 (AI-231): Static checks |
10340 | ||
0791fbe9 | 10341 | if Ada_Version >= Ada_2005 |
41251c60 JM |
10342 | and then Is_Access_Type (Etype (Formal)) |
10343 | and then Can_Never_Be_Null (Etype (Formal)) | |
10344 | then | |
10345 | Null_Exclusion_Static_Checks (Param_Spec); | |
10346 | end if; | |
10347 | ||
f1bd0415 AC |
10348 | -- The following checks are relevant when SPARK_Mode is on as these |
10349 | -- are not standard Ada legality rules. | |
6c3c671e | 10350 | |
ea26c8e4 HK |
10351 | if SPARK_Mode = On then |
10352 | if Ekind_In (Scope (Formal), E_Function, E_Generic_Function) then | |
f1bd0415 | 10353 | |
ea26c8e4 HK |
10354 | -- A function cannot have a parameter of mode IN OUT or OUT |
10355 | -- (SPARK RM 6.1). | |
f1bd0415 | 10356 | |
ea26c8e4 HK |
10357 | if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then |
10358 | Error_Msg_N | |
10359 | ("function cannot have parameter of mode `OUT` or " | |
10360 | & "`IN OUT`", Formal); | |
f1bd0415 | 10361 | |
d780e54f AC |
10362 | -- A function cannot have an effectively volatile formal |
10363 | -- parameter (SPARK RM 7.1.3(10)). | |
ea26c8e4 | 10364 | |
d780e54f | 10365 | elsif Is_Effectively_Volatile (Formal) then |
ea26c8e4 HK |
10366 | Error_Msg_N |
10367 | ("function cannot have a volatile formal parameter", | |
10368 | Formal); | |
10369 | end if; | |
10370 | ||
d780e54f AC |
10371 | -- A procedure cannot have an effectively volatile formal |
10372 | -- parameter of mode IN because it behaves as a constant | |
10373 | -- (SPARK RM 7.1.3(6)). | |
ea26c8e4 HK |
10374 | |
10375 | elsif Ekind (Scope (Formal)) = E_Procedure | |
10376 | and then Ekind (Formal) = E_In_Parameter | |
d780e54f | 10377 | and then Is_Effectively_Volatile (Formal) |
ea26c8e4 | 10378 | then |
f1bd0415 | 10379 | Error_Msg_N |
ea26c8e4 | 10380 | ("formal parameter of mode `IN` cannot be volatile", Formal); |
f1bd0415 | 10381 | end if; |
6c3c671e AC |
10382 | end if; |
10383 | ||
996ae0b0 RK |
10384 | <<Continue>> |
10385 | Next (Param_Spec); | |
10386 | end loop; | |
10387 | ||
82c80734 RD |
10388 | -- If this is the formal part of a function specification, analyze the |
10389 | -- subtype mark in the context where the formals are visible but not | |
10390 | -- yet usable, and may hide outer homographs. | |
10391 | ||
10392 | if Nkind (Related_Nod) = N_Function_Specification then | |
10393 | Analyze_Return_Type (Related_Nod); | |
10394 | end if; | |
10395 | ||
996ae0b0 RK |
10396 | -- Now set the kind (mode) of each formal |
10397 | ||
10398 | Param_Spec := First (T); | |
996ae0b0 RK |
10399 | while Present (Param_Spec) loop |
10400 | Formal := Defining_Identifier (Param_Spec); | |
10401 | Set_Formal_Mode (Formal); | |
10402 | ||
10403 | if Ekind (Formal) = E_In_Parameter then | |
10404 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
10405 | ||
10406 | if Present (Expression (Param_Spec)) then | |
10407 | Default := Expression (Param_Spec); | |
10408 | ||
10409 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
10410 | if Nkind (Parameter_Type (Param_Spec)) /= |
10411 | N_Access_Definition | |
996ae0b0 RK |
10412 | then |
10413 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 10414 | else |
5ebfaacf AC |
10415 | Formal_Type := |
10416 | Access_Definition | |
10417 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
10418 | end if; |
10419 | ||
10420 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
10421 | end if; | |
2820d220 | 10422 | end if; |
800621e0 RD |
10423 | |
10424 | elsif Ekind (Formal) = E_Out_Parameter then | |
10425 | Num_Out_Params := Num_Out_Params + 1; | |
10426 | ||
10427 | if Num_Out_Params = 1 then | |
10428 | First_Out_Param := Formal; | |
10429 | end if; | |
10430 | ||
10431 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
10432 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
10433 | end if; |
10434 | ||
4172a8e3 AC |
10435 | -- Skip remaining processing if formal type was in error |
10436 | ||
10437 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
10438 | goto Next_Parameter; | |
10439 | end if; | |
10440 | ||
fecbd779 AC |
10441 | -- Force call by reference if aliased |
10442 | ||
10443 | if Is_Aliased (Formal) then | |
10444 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf AC |
10445 | |
10446 | -- Warn if user asked this to be passed by copy | |
10447 | ||
10448 | if Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10449 | Error_Msg_N | |
b785e0b8 | 10450 | ("cannot pass aliased parameter & by copy??", Formal); |
5ebfaacf AC |
10451 | end if; |
10452 | ||
10453 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy | |
10454 | ||
10455 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10456 | Set_Mechanism (Formal, By_Copy); | |
10457 | ||
10458 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Reference then | |
10459 | Set_Mechanism (Formal, By_Reference); | |
fecbd779 AC |
10460 | end if; |
10461 | ||
4172a8e3 | 10462 | <<Next_Parameter>> |
996ae0b0 RK |
10463 | Next (Param_Spec); |
10464 | end loop; | |
800621e0 RD |
10465 | |
10466 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
10467 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
10468 | end if; | |
996ae0b0 RK |
10469 | end Process_Formals; |
10470 | ||
fbf5a39b AC |
10471 | ---------------------------- |
10472 | -- Reference_Body_Formals -- | |
10473 | ---------------------------- | |
10474 | ||
10475 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
10476 | Fs : Entity_Id; | |
10477 | Fb : Entity_Id; | |
10478 | ||
10479 | begin | |
10480 | if Error_Posted (Spec) then | |
10481 | return; | |
10482 | end if; | |
10483 | ||
0a36105d JM |
10484 | -- Iterate over both lists. They may be of different lengths if the two |
10485 | -- specs are not conformant. | |
10486 | ||
fbf5a39b AC |
10487 | Fs := First_Formal (Spec); |
10488 | Fb := First_Formal (Bod); | |
0a36105d | 10489 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
10490 | Generate_Reference (Fs, Fb, 'b'); |
10491 | ||
10492 | if Style_Check then | |
10493 | Style.Check_Identifier (Fb, Fs); | |
10494 | end if; | |
10495 | ||
10496 | Set_Spec_Entity (Fb, Fs); | |
10497 | Set_Referenced (Fs, False); | |
10498 | Next_Formal (Fs); | |
10499 | Next_Formal (Fb); | |
10500 | end loop; | |
10501 | end Reference_Body_Formals; | |
10502 | ||
996ae0b0 RK |
10503 | ------------------------- |
10504 | -- Set_Actual_Subtypes -- | |
10505 | ------------------------- | |
10506 | ||
10507 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
84c0a895 AC |
10508 | Decl : Node_Id; |
10509 | Formal : Entity_Id; | |
10510 | T : Entity_Id; | |
10511 | First_Stmt : Node_Id := Empty; | |
10512 | AS_Needed : Boolean; | |
996ae0b0 RK |
10513 | |
10514 | begin | |
f3d57416 | 10515 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
10516 | -- actual subtypes (small optimization). |
10517 | ||
8fde064e | 10518 | if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
fbf5a39b AC |
10519 | return; |
10520 | end if; | |
10521 | ||
996ae0b0 RK |
10522 | Formal := First_Formal (Subp); |
10523 | while Present (Formal) loop | |
10524 | T := Etype (Formal); | |
10525 | ||
e895b435 | 10526 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
10527 | |
10528 | if Is_Constrained (T) then | |
10529 | AS_Needed := False; | |
10530 | ||
82c80734 | 10531 | -- If we have unknown discriminants, then we do not need an actual |
a90bd866 | 10532 | -- subtype, or more accurately we cannot figure it out. Note that |
82c80734 | 10533 | -- all class-wide types have unknown discriminants. |
996ae0b0 RK |
10534 | |
10535 | elsif Has_Unknown_Discriminants (T) then | |
10536 | AS_Needed := False; | |
10537 | ||
82c80734 RD |
10538 | -- At this stage we have an unconstrained type that may need an |
10539 | -- actual subtype. For sure the actual subtype is needed if we have | |
10540 | -- an unconstrained array type. | |
996ae0b0 RK |
10541 | |
10542 | elsif Is_Array_Type (T) then | |
10543 | AS_Needed := True; | |
10544 | ||
d8db0bca JM |
10545 | -- The only other case needing an actual subtype is an unconstrained |
10546 | -- record type which is an IN parameter (we cannot generate actual | |
10547 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
10548 | -- change the discriminant values. However we exclude the case of | |
10549 | -- initialization procedures, since discriminants are handled very | |
10550 | -- specially in this context, see the section entitled "Handling of | |
10551 | -- Discriminants" in Einfo. | |
10552 | ||
10553 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
10554 | -- in front end layout mode for size/offset values), since in such | |
10555 | -- functions only discriminants are referenced, and not only are such | |
10556 | -- subtypes not needed, but they cannot always be generated, because | |
10557 | -- of order of elaboration issues. | |
996ae0b0 RK |
10558 | |
10559 | elsif Is_Record_Type (T) | |
10560 | and then Ekind (Formal) = E_In_Parameter | |
10561 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 10562 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
10563 | and then not Is_Discrim_SO_Function (Subp) |
10564 | then | |
10565 | AS_Needed := True; | |
10566 | ||
10567 | -- All other cases do not need an actual subtype | |
10568 | ||
10569 | else | |
10570 | AS_Needed := False; | |
10571 | end if; | |
10572 | ||
10573 | -- Generate actual subtypes for unconstrained arrays and | |
10574 | -- unconstrained discriminated records. | |
10575 | ||
10576 | if AS_Needed then | |
7324bf49 | 10577 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 10578 | |
57a8057a | 10579 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
10580 | -- variable that renames the corresponding entry of the |
10581 | -- parameter block, and it is this local variable that may | |
da94696d | 10582 | -- require an actual subtype. |
fbf5a39b | 10583 | |
4460a9bc | 10584 | if Expander_Active then |
fbf5a39b AC |
10585 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
10586 | else | |
10587 | Decl := Build_Actual_Subtype (T, Formal); | |
10588 | end if; | |
10589 | ||
996ae0b0 RK |
10590 | if Present (Handled_Statement_Sequence (N)) then |
10591 | First_Stmt := | |
10592 | First (Statements (Handled_Statement_Sequence (N))); | |
10593 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
10594 | Mark_Rewrite_Insertion (Decl); | |
10595 | else | |
82c80734 RD |
10596 | -- If the accept statement has no body, there will be no |
10597 | -- reference to the actuals, so no need to compute actual | |
10598 | -- subtypes. | |
996ae0b0 RK |
10599 | |
10600 | return; | |
10601 | end if; | |
10602 | ||
10603 | else | |
fbf5a39b | 10604 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
10605 | Prepend (Decl, Declarations (N)); |
10606 | Mark_Rewrite_Insertion (Decl); | |
10607 | end if; | |
10608 | ||
82c80734 RD |
10609 | -- The declaration uses the bounds of an existing object, and |
10610 | -- therefore needs no constraint checks. | |
2820d220 | 10611 | |
7324bf49 | 10612 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 10613 | |
996ae0b0 RK |
10614 | -- We need to freeze manually the generated type when it is |
10615 | -- inserted anywhere else than in a declarative part. | |
10616 | ||
10617 | if Present (First_Stmt) then | |
10618 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 10619 | Freeze_Entity (Defining_Identifier (Decl), N)); |
fcadacf7 ES |
10620 | |
10621 | -- Ditto if the type has a dynamic predicate, because the | |
10622 | -- generated function will mention the actual subtype. | |
10623 | ||
10624 | elsif Has_Dynamic_Predicate_Aspect (T) then | |
10625 | Insert_List_Before_And_Analyze (Decl, | |
10626 | Freeze_Entity (Defining_Identifier (Decl), N)); | |
996ae0b0 RK |
10627 | end if; |
10628 | ||
fbf5a39b | 10629 | if Nkind (N) = N_Accept_Statement |
4460a9bc | 10630 | and then Expander_Active |
fbf5a39b AC |
10631 | then |
10632 | Set_Actual_Subtype (Renamed_Object (Formal), | |
10633 | Defining_Identifier (Decl)); | |
10634 | else | |
10635 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
10636 | end if; | |
996ae0b0 RK |
10637 | end if; |
10638 | ||
10639 | Next_Formal (Formal); | |
10640 | end loop; | |
10641 | end Set_Actual_Subtypes; | |
10642 | ||
10643 | --------------------- | |
10644 | -- Set_Formal_Mode -- | |
10645 | --------------------- | |
10646 | ||
10647 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
07aa5e6f | 10648 | Spec : constant Node_Id := Parent (Formal_Id); |
288cbbbd | 10649 | Id : constant Entity_Id := Scope (Formal_Id); |
996ae0b0 RK |
10650 | |
10651 | begin | |
10652 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
10653 | -- since we ensure that corresponding actuals are always valid at the | |
10654 | -- point of the call. | |
10655 | ||
10656 | if Out_Present (Spec) then | |
288cbbbd JM |
10657 | if Ekind_In (Id, E_Entry, E_Entry_Family) |
10658 | or else Is_Subprogram_Or_Generic_Subprogram (Id) | |
10659 | then | |
10660 | Set_Has_Out_Or_In_Out_Parameter (Id, True); | |
10661 | end if; | |
10662 | ||
10663 | if Ekind_In (Id, E_Function, E_Generic_Function) then | |
fc999c5d | 10664 | |
b4ca2d2c | 10665 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
10666 | |
10667 | if Ada_Version >= Ada_2012 then | |
e6425869 AC |
10668 | |
10669 | -- Even in Ada 2012 operators can only have IN parameters | |
10670 | ||
10671 | if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then | |
10672 | Error_Msg_N ("operators can only have IN parameters", Spec); | |
10673 | end if; | |
10674 | ||
c56a9ba4 AC |
10675 | if In_Present (Spec) then |
10676 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10677 | else | |
10678 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
10679 | end if; | |
10680 | ||
b4ca2d2c AC |
10681 | -- But not in earlier versions of Ada |
10682 | ||
c56a9ba4 AC |
10683 | else |
10684 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
10685 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10686 | end if; | |
996ae0b0 RK |
10687 | |
10688 | elsif In_Present (Spec) then | |
10689 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10690 | ||
10691 | else | |
fbf5a39b AC |
10692 | Set_Ekind (Formal_Id, E_Out_Parameter); |
10693 | Set_Never_Set_In_Source (Formal_Id, True); | |
10694 | Set_Is_True_Constant (Formal_Id, False); | |
10695 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
10696 | end if; |
10697 | ||
10698 | else | |
10699 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10700 | end if; | |
10701 | ||
fbf5a39b | 10702 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
10703 | -- guarantees that access parameters are always non-null. We also set |
10704 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
10705 | |
10706 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 10707 | |
885c4871 | 10708 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 10709 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 10710 | |
0791fbe9 | 10711 | if Ada_Version < Ada_2005 |
2813bb6b | 10712 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
10713 | then |
10714 | Set_Is_Known_Non_Null (Formal_Id); | |
10715 | Set_Can_Never_Be_Null (Formal_Id); | |
10716 | end if; | |
2813bb6b | 10717 | |
41251c60 JM |
10718 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
10719 | ||
2813bb6b ES |
10720 | elsif Is_Access_Type (Etype (Formal_Id)) |
10721 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
10722 | then | |
2813bb6b | 10723 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
10724 | |
10725 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
10726 | -- access checks) for the case of an IN parameter, which cannot | |
10727 | -- be changed, or for an IN OUT parameter, which can be changed but | |
10728 | -- not to a null value. But for an OUT parameter, the initial value | |
10729 | -- passed in can be null, so we can't set this flag in that case. | |
10730 | ||
10731 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
10732 | Set_Can_Never_Be_Null (Formal_Id); | |
10733 | end if; | |
fbf5a39b AC |
10734 | end if; |
10735 | ||
996ae0b0 RK |
10736 | Set_Mechanism (Formal_Id, Default_Mechanism); |
10737 | Set_Formal_Validity (Formal_Id); | |
10738 | end Set_Formal_Mode; | |
10739 | ||
10740 | ------------------------- | |
10741 | -- Set_Formal_Validity -- | |
10742 | ------------------------- | |
10743 | ||
10744 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
10745 | begin | |
82c80734 RD |
10746 | -- If no validity checking, then we cannot assume anything about the |
10747 | -- validity of parameters, since we do not know there is any checking | |
10748 | -- of the validity on the call side. | |
996ae0b0 RK |
10749 | |
10750 | if not Validity_Checks_On then | |
10751 | return; | |
10752 | ||
fbf5a39b AC |
10753 | -- If validity checking for parameters is enabled, this means we are |
10754 | -- not supposed to make any assumptions about argument values. | |
10755 | ||
10756 | elsif Validity_Check_Parameters then | |
10757 | return; | |
10758 | ||
10759 | -- If we are checking in parameters, we will assume that the caller is | |
10760 | -- also checking parameters, so we can assume the parameter is valid. | |
10761 | ||
996ae0b0 RK |
10762 | elsif Ekind (Formal_Id) = E_In_Parameter |
10763 | and then Validity_Check_In_Params | |
10764 | then | |
10765 | Set_Is_Known_Valid (Formal_Id, True); | |
10766 | ||
fbf5a39b AC |
10767 | -- Similar treatment for IN OUT parameters |
10768 | ||
996ae0b0 RK |
10769 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
10770 | and then Validity_Check_In_Out_Params | |
10771 | then | |
10772 | Set_Is_Known_Valid (Formal_Id, True); | |
10773 | end if; | |
10774 | end Set_Formal_Validity; | |
10775 | ||
10776 | ------------------------ | |
10777 | -- Subtype_Conformant -- | |
10778 | ------------------------ | |
10779 | ||
ce2b6ba5 JM |
10780 | function Subtype_Conformant |
10781 | (New_Id : Entity_Id; | |
10782 | Old_Id : Entity_Id; | |
10783 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10784 | is | |
996ae0b0 | 10785 | Result : Boolean; |
996ae0b0 | 10786 | begin |
ce2b6ba5 JM |
10787 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
10788 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10789 | return Result; |
10790 | end Subtype_Conformant; | |
10791 | ||
10792 | --------------------- | |
10793 | -- Type_Conformant -- | |
10794 | --------------------- | |
10795 | ||
41251c60 JM |
10796 | function Type_Conformant |
10797 | (New_Id : Entity_Id; | |
10798 | Old_Id : Entity_Id; | |
10799 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10800 | is | |
996ae0b0 | 10801 | Result : Boolean; |
996ae0b0 | 10802 | begin |
c8ef728f | 10803 | May_Hide_Profile := False; |
41251c60 JM |
10804 | Check_Conformance |
10805 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
10806 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10807 | return Result; |
10808 | end Type_Conformant; | |
10809 | ||
10810 | ------------------------------- | |
10811 | -- Valid_Operator_Definition -- | |
10812 | ------------------------------- | |
10813 | ||
10814 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
10815 | N : Integer := 0; | |
10816 | F : Entity_Id; | |
10817 | Id : constant Name_Id := Chars (Designator); | |
10818 | N_OK : Boolean; | |
10819 | ||
10820 | begin | |
10821 | F := First_Formal (Designator); | |
996ae0b0 RK |
10822 | while Present (F) loop |
10823 | N := N + 1; | |
10824 | ||
10825 | if Present (Default_Value (F)) then | |
ed2233dc | 10826 | Error_Msg_N |
996ae0b0 RK |
10827 | ("default values not allowed for operator parameters", |
10828 | Parent (F)); | |
220d1fd9 AC |
10829 | |
10830 | -- For function instantiations that are operators, we must check | |
10831 | -- separately that the corresponding generic only has in-parameters. | |
84c0a895 AC |
10832 | -- For subprogram declarations this is done in Set_Formal_Mode. Such |
10833 | -- an error could not arise in earlier versions of the language. | |
220d1fd9 AC |
10834 | |
10835 | elsif Ekind (F) /= E_In_Parameter then | |
84c0a895 | 10836 | Error_Msg_N ("operators can only have IN parameters", F); |
996ae0b0 RK |
10837 | end if; |
10838 | ||
10839 | Next_Formal (F); | |
10840 | end loop; | |
10841 | ||
10842 | -- Verify that user-defined operators have proper number of arguments | |
10843 | -- First case of operators which can only be unary | |
10844 | ||
b69cd36a | 10845 | if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
996ae0b0 RK |
10846 | N_OK := (N = 1); |
10847 | ||
10848 | -- Case of operators which can be unary or binary | |
10849 | ||
b69cd36a | 10850 | elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
10851 | N_OK := (N in 1 .. 2); |
10852 | ||
10853 | -- All other operators can only be binary | |
10854 | ||
10855 | else | |
10856 | N_OK := (N = 2); | |
10857 | end if; | |
10858 | ||
10859 | if not N_OK then | |
10860 | Error_Msg_N | |
10861 | ("incorrect number of arguments for operator", Designator); | |
10862 | end if; | |
10863 | ||
10864 | if Id = Name_Op_Ne | |
10865 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
10866 | and then not Is_Intrinsic_Subprogram (Designator) | |
10867 | then | |
10868 | Error_Msg_N | |
84c0a895 | 10869 | ("explicit definition of inequality not allowed", Designator); |
996ae0b0 RK |
10870 | end if; |
10871 | end Valid_Operator_Definition; | |
10872 | ||
10873 | end Sem_Ch6; |