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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 | -- -- |
d3820795 | 9 | -- Copyright (C) 1992-2013, 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; |
41251c60 | 43 | with Itypes; use Itypes; |
996ae0b0 | 44 | with Lib.Xref; use Lib.Xref; |
ec4867fa | 45 | with Layout; use Layout; |
996ae0b0 RK |
46 | with Namet; use Namet; |
47 | with Lib; use Lib; | |
48 | with Nlists; use Nlists; | |
49 | with Nmake; use Nmake; | |
50 | with Opt; use Opt; | |
51 | with Output; use Output; | |
b20de9b9 AC |
52 | with Restrict; use Restrict; |
53 | with Rident; use Rident; | |
996ae0b0 RK |
54 | with Rtsfind; use Rtsfind; |
55 | with Sem; use Sem; | |
a4100e55 | 56 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
57 | with Sem_Cat; use Sem_Cat; |
58 | with Sem_Ch3; use Sem_Ch3; | |
59 | with Sem_Ch4; use Sem_Ch4; | |
60 | with Sem_Ch5; use Sem_Ch5; | |
61 | with Sem_Ch8; use Sem_Ch8; | |
9bc856dd | 62 | with Sem_Ch10; use Sem_Ch10; |
996ae0b0 | 63 | with Sem_Ch12; use Sem_Ch12; |
0f1a6a0b | 64 | with Sem_Ch13; use Sem_Ch13; |
dec6faf1 | 65 | with Sem_Dim; use Sem_Dim; |
996ae0b0 RK |
66 | with Sem_Disp; use Sem_Disp; |
67 | with Sem_Dist; use Sem_Dist; | |
68 | with Sem_Elim; use Sem_Elim; | |
69 | with Sem_Eval; use Sem_Eval; | |
70 | with Sem_Mech; use Sem_Mech; | |
71 | with Sem_Prag; use Sem_Prag; | |
72 | with Sem_Res; use Sem_Res; | |
73 | with Sem_Util; use Sem_Util; | |
74 | with Sem_Type; use Sem_Type; | |
75 | with Sem_Warn; use Sem_Warn; | |
76 | with Sinput; use Sinput; | |
77 | with Stand; use Stand; | |
78 | with Sinfo; use Sinfo; | |
79 | with Sinfo.CN; use Sinfo.CN; | |
80 | with Snames; use Snames; | |
81 | with Stringt; use Stringt; | |
82 | with Style; | |
83 | with Stylesw; use Stylesw; | |
8417f4b2 | 84 | with Targparm; use Targparm; |
996ae0b0 RK |
85 | with Tbuild; use Tbuild; |
86 | with Uintp; use Uintp; | |
87 | with Urealp; use Urealp; | |
88 | with Validsw; use Validsw; | |
89 | ||
90 | package body Sem_Ch6 is | |
91 | ||
c8ef728f | 92 | May_Hide_Profile : Boolean := False; |
ec4867fa ES |
93 | -- This flag is used to indicate that two formals in two subprograms being |
94 | -- checked for conformance differ only in that one is an access parameter | |
95 | -- while the other is of a general access type with the same designated | |
96 | -- type. In this case, if the rest of the signatures match, a call to | |
97 | -- either subprogram may be ambiguous, which is worth a warning. The flag | |
98 | -- is set in Compatible_Types, and the warning emitted in | |
99 | -- New_Overloaded_Entity. | |
c8ef728f | 100 | |
996ae0b0 RK |
101 | ----------------------- |
102 | -- Local Subprograms -- | |
103 | ----------------------- | |
104 | ||
4d8f3296 ES |
105 | procedure Analyze_Null_Procedure |
106 | (N : Node_Id; | |
107 | Is_Completion : out Boolean); | |
108 | -- A null procedure can be a declaration or (Ada 2012) a completion. | |
109 | ||
5d37ba92 | 110 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 111 | -- Common processing for simple and extended return statements |
ec4867fa ES |
112 | |
113 | procedure Analyze_Function_Return (N : Node_Id); | |
81db9d77 ES |
114 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement |
115 | -- applies to a [generic] function. | |
ec4867fa | 116 | |
82c80734 RD |
117 | procedure Analyze_Return_Type (N : Node_Id); |
118 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 119 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
120 | -- outer homographs. |
121 | ||
b1b543d2 | 122 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
123 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
124 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 125 | |
996ae0b0 | 126 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); |
82c80734 RD |
127 | -- Analyze a generic subprogram body. N is the body to be analyzed, and |
128 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
996ae0b0 | 129 | |
d05ef0ab | 130 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id); |
996ae0b0 RK |
131 | -- If a subprogram has pragma Inline and inlining is active, use generic |
132 | -- machinery to build an unexpanded body for the subprogram. This body is | |
f3d57416 | 133 | -- subsequently used for inline expansions at call sites. If subprogram can |
996ae0b0 RK |
134 | -- be inlined (depending on size and nature of local declarations) this |
135 | -- function returns true. Otherwise subprogram body is treated normally. | |
aa720a54 AC |
136 | -- If proper warnings are enabled and the subprogram contains a construct |
137 | -- that cannot be inlined, the offending construct is flagged accordingly. | |
996ae0b0 | 138 | |
806f6d37 AC |
139 | function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
140 | -- Returns true if Subp can override a predefined operator. | |
141 | ||
84f4072a JM |
142 | procedure Check_And_Build_Body_To_Inline |
143 | (N : Node_Id; | |
144 | Spec_Id : Entity_Id; | |
145 | Body_Id : Entity_Id); | |
146 | -- Spec_Id and Body_Id are the entities of the specification and body of | |
147 | -- the subprogram body N. If N can be inlined by the frontend (supported | |
148 | -- cases documented in Check_Body_To_Inline) then build the body-to-inline | |
149 | -- associated with N and attach it to the declaration node of Spec_Id. | |
150 | ||
996ae0b0 | 151 | procedure Check_Conformance |
41251c60 JM |
152 | (New_Id : Entity_Id; |
153 | Old_Id : Entity_Id; | |
154 | Ctype : Conformance_Type; | |
155 | Errmsg : Boolean; | |
156 | Conforms : out Boolean; | |
157 | Err_Loc : Node_Id := Empty; | |
158 | Get_Inst : Boolean := False; | |
159 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
160 | -- Given two entities, this procedure checks that the profiles associated |
161 | -- with these entities meet the conformance criterion given by the third | |
162 | -- parameter. If they conform, Conforms is set True and control returns | |
163 | -- to the caller. If they do not conform, Conforms is set to False, and | |
164 | -- in addition, if Errmsg is True on the call, proper messages are output | |
165 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
166 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
167 | -- error messages are placed on the appropriate part of the construct | |
168 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
169 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
170 | -- be called. | |
171 | ||
172 | procedure Check_Subprogram_Order (N : Node_Id); | |
173 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
174 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
175 | ||
996ae0b0 RK |
176 | procedure Check_Returns |
177 | (HSS : Node_Id; | |
178 | Mode : Character; | |
c8ef728f ES |
179 | Err : out Boolean; |
180 | Proc : Entity_Id := Empty); | |
181 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 182 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
183 | -- handled statement sequence for the subprogram body. This procedure |
184 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
185 | -- used for functions) or do not have a return (Mode = 'P', used for | |
186 | -- No_Return procedures). The flag Err is set if there are any control | |
187 | -- paths not explicitly terminated by a return in the function case, and is | |
188 | -- True otherwise. Proc is the entity for the procedure case and is used | |
189 | -- in posting the warning message. | |
996ae0b0 | 190 | |
e5a58fac AC |
191 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
192 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
193 | -- must appear before the type is frozen, and have the same visibility as | |
194 | -- that of the type. This procedure checks that this rule is met, and | |
195 | -- otherwise emits an error on the subprogram declaration and a warning | |
b2834fbd AC |
196 | -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode, |
197 | -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier | |
198 | -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility | |
199 | -- is set, otherwise the call has no effect. | |
e5a58fac | 200 | |
996ae0b0 | 201 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
202 | -- This procedure makes S, a new overloaded entity, into the first visible |
203 | -- entity with that name. | |
996ae0b0 | 204 | |
a5b62485 AC |
205 | function Is_Non_Overriding_Operation |
206 | (Prev_E : Entity_Id; | |
207 | New_E : Entity_Id) return Boolean; | |
208 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
209 | -- overrides an inherited operation only if the corresponding operation | |
260359e3 AC |
210 | -- was overriding in the generic. This needs to be checked for primitive |
211 | -- operations of types derived (in the generic unit) from formal private | |
212 | -- or formal derived types. | |
a5b62485 | 213 | |
996ae0b0 RK |
214 | procedure Make_Inequality_Operator (S : Entity_Id); |
215 | -- Create the declaration for an inequality operator that is implicitly | |
216 | -- created by a user-defined equality operator that yields a boolean. | |
217 | ||
996ae0b0 RK |
218 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
219 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
220 | -- setting the proper validity status for this entity, which depends on |
221 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
222 | |
223 | --------------------------------------------- | |
224 | -- Analyze_Abstract_Subprogram_Declaration -- | |
225 | --------------------------------------------- | |
226 | ||
227 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
fbf5a39b AC |
228 | Designator : constant Entity_Id := |
229 | Analyze_Subprogram_Specification (Specification (N)); | |
996ae0b0 RK |
230 | Scop : constant Entity_Id := Current_Scope; |
231 | ||
232 | begin | |
2ba431e5 | 233 | Check_SPARK_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 234 | |
996ae0b0 | 235 | Generate_Definition (Designator); |
dac3bede | 236 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
f937473f | 237 | Set_Is_Abstract_Subprogram (Designator); |
996ae0b0 RK |
238 | New_Overloaded_Entity (Designator); |
239 | Check_Delayed_Subprogram (Designator); | |
240 | ||
fbf5a39b | 241 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 RK |
242 | |
243 | if Ekind (Scope (Designator)) = E_Protected_Type then | |
244 | Error_Msg_N | |
245 | ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
246 | |
247 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
248 | -- operation nor an operation that overrides an inherited subprogram or | |
249 | -- predefined operator, since this most likely indicates a mistake. | |
250 | ||
251 | elsif Warn_On_Redundant_Constructs | |
252 | and then not Is_Dispatching_Operation (Designator) | |
038140ed | 253 | and then not Present (Overridden_Operation (Designator)) |
5d37ba92 ES |
254 | and then (not Is_Operator_Symbol_Name (Chars (Designator)) |
255 | or else Scop /= Scope (Etype (First_Formal (Designator)))) | |
256 | then | |
257 | Error_Msg_N | |
dbfeb4fa | 258 | ("abstract subprogram is not dispatching or overriding?r?", N); |
996ae0b0 | 259 | end if; |
fbf5a39b AC |
260 | |
261 | Generate_Reference_To_Formals (Designator); | |
361effb1 | 262 | Check_Eliminated (Designator); |
eaba57fb RD |
263 | |
264 | if Has_Aspects (N) then | |
265 | Analyze_Aspect_Specifications (N, Designator); | |
266 | end if; | |
996ae0b0 RK |
267 | end Analyze_Abstract_Subprogram_Declaration; |
268 | ||
b0186f71 AC |
269 | --------------------------------- |
270 | -- Analyze_Expression_Function -- | |
271 | --------------------------------- | |
272 | ||
273 | procedure Analyze_Expression_Function (N : Node_Id) is | |
274 | Loc : constant Source_Ptr := Sloc (N); | |
275 | LocX : constant Source_Ptr := Sloc (Expression (N)); | |
0b5b2bbc | 276 | Expr : constant Node_Id := Expression (N); |
d2d4b355 AC |
277 | Spec : constant Node_Id := Specification (N); |
278 | ||
8a06151a | 279 | Def_Id : Entity_Id; |
b0186f71 | 280 | |
8a06151a | 281 | Prev : Entity_Id; |
b0186f71 | 282 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
283 | -- declaration is completed. Def_Id is needed to analyze the spec. |
284 | ||
285 | New_Body : Node_Id; | |
286 | New_Decl : Node_Id; | |
287 | New_Spec : Node_Id; | |
b913199e | 288 | Ret : Node_Id; |
b0186f71 AC |
289 | |
290 | begin | |
291 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 292 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
293 | -- function into an equivalent subprogram body, and analyze it. |
294 | ||
295 | -- Expression functions are inlined unconditionally. The back-end will | |
296 | -- determine whether this is possible. | |
297 | ||
298 | Inline_Processing_Required := True; | |
b727a82b AC |
299 | |
300 | -- Create a specification for the generated body. Types and defauts in | |
301 | -- the profile are copies of the spec, but new entities must be created | |
302 | -- for the unit name and the formals. | |
303 | ||
304 | New_Spec := New_Copy_Tree (Spec); | |
305 | Set_Defining_Unit_Name (New_Spec, | |
306 | Make_Defining_Identifier (Sloc (Defining_Unit_Name (Spec)), | |
307 | Chars (Defining_Unit_Name (Spec)))); | |
308 | ||
309 | if Present (Parameter_Specifications (New_Spec)) then | |
310 | declare | |
311 | Formal_Spec : Node_Id; | |
312 | begin | |
313 | Formal_Spec := First (Parameter_Specifications (New_Spec)); | |
314 | while Present (Formal_Spec) loop | |
315 | Set_Defining_Identifier | |
316 | (Formal_Spec, | |
317 | Make_Defining_Identifier (Sloc (Formal_Spec), | |
318 | Chars => Chars (Defining_Identifier (Formal_Spec)))); | |
319 | Next (Formal_Spec); | |
320 | end loop; | |
321 | end; | |
322 | end if; | |
323 | ||
51597c23 | 324 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); |
d2d4b355 AC |
325 | |
326 | -- If there are previous overloadable entities with the same name, | |
327 | -- check whether any of them is completed by the expression function. | |
328 | ||
8a06151a | 329 | if Present (Prev) and then Is_Overloadable (Prev) then |
51597c23 AC |
330 | Def_Id := Analyze_Subprogram_Specification (Spec); |
331 | Prev := Find_Corresponding_Spec (N); | |
d2d4b355 | 332 | end if; |
b0186f71 | 333 | |
b913199e AC |
334 | Ret := Make_Simple_Return_Statement (LocX, Expression (N)); |
335 | ||
b0186f71 AC |
336 | New_Body := |
337 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 338 | Specification => New_Spec, |
b0186f71 AC |
339 | Declarations => Empty_List, |
340 | Handled_Statement_Sequence => | |
341 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 342 | Statements => New_List (Ret))); |
b0186f71 | 343 | |
e7f23f06 AC |
344 | -- If the expression completes a generic subprogram, we must create a |
345 | -- separate node for the body, because at instantiation the original | |
346 | -- node of the generic copy must be a generic subprogram body, and | |
347 | -- cannot be a expression function. Otherwise we just rewrite the | |
348 | -- expression with the non-generic body. | |
349 | ||
6d7e5c54 | 350 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
e7f23f06 | 351 | Insert_After (N, New_Body); |
6d7e5c54 | 352 | |
e7f23f06 AC |
353 | -- Propagate any aspects or pragmas that apply to the expression |
354 | -- function to the proper body when the expression function acts | |
355 | -- as a completion. | |
356 | ||
357 | if Has_Aspects (N) then | |
358 | Move_Aspects (N, To => New_Body); | |
359 | end if; | |
360 | ||
361 | Relocate_Pragmas_To_Body (New_Body); | |
b0186f71 | 362 | |
b0186f71 | 363 | Rewrite (N, Make_Null_Statement (Loc)); |
d2d4b355 | 364 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
365 | Analyze (N); |
366 | Analyze (New_Body); | |
d2b10647 | 367 | Set_Is_Inlined (Prev); |
b0186f71 | 368 | |
8fde064e | 369 | elsif Present (Prev) and then Comes_From_Source (Prev) then |
d2d4b355 | 370 | Set_Has_Completion (Prev, False); |
76264f60 | 371 | |
c6d2191a AC |
372 | -- An expression function that is a completion freezes the |
373 | -- expression. This means freezing the return type, and if it is | |
374 | -- an access type, freezing its designated type as well. | |
375 | -- Note that we cannot defer this freezing to the analysis of the | |
376 | -- expression itself, because a freeze node might appear in a | |
377 | -- nested scope, leading to an elaboration order issue in gigi. | |
378 | ||
379 | Freeze_Before (N, Etype (Prev)); | |
380 | if Is_Access_Type (Etype (Prev)) then | |
381 | Freeze_Before (N, Designated_Type (Etype (Prev))); | |
382 | end if; | |
383 | ||
76264f60 AC |
384 | -- For navigation purposes, indicate that the function is a body |
385 | ||
386 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 387 | Rewrite (N, New_Body); |
e7f23f06 | 388 | |
c0cdbd39 AC |
389 | -- Correct the parent pointer of the aspect specification list to |
390 | -- reference the rewritten node. | |
391 | ||
392 | if Has_Aspects (N) then | |
393 | Set_Parent (Aspect_Specifications (N), N); | |
394 | end if; | |
395 | ||
e7f23f06 AC |
396 | -- Propagate any pragmas that apply to the expression function to the |
397 | -- proper body when the expression function acts as a completion. | |
398 | -- Aspects are automatically transfered because of node rewriting. | |
399 | ||
400 | Relocate_Pragmas_To_Body (N); | |
d2b10647 ES |
401 | Analyze (N); |
402 | ||
6d7e5c54 AC |
403 | -- Prev is the previous entity with the same name, but it is can |
404 | -- be an unrelated spec that is not completed by the expression | |
405 | -- function. In that case the relevant entity is the one in the body. | |
406 | -- Not clear that the backend can inline it in this case ??? | |
407 | ||
408 | if Has_Completion (Prev) then | |
409 | Set_Is_Inlined (Prev); | |
31af8899 AC |
410 | |
411 | -- The formals of the expression function are body formals, | |
412 | -- and do not appear in the ali file, which will only contain | |
413 | -- references to the formals of the original subprogram spec. | |
414 | ||
415 | declare | |
416 | F1 : Entity_Id; | |
417 | F2 : Entity_Id; | |
418 | ||
419 | begin | |
420 | F1 := First_Formal (Def_Id); | |
421 | F2 := First_Formal (Prev); | |
422 | ||
423 | while Present (F1) loop | |
424 | Set_Spec_Entity (F1, F2); | |
425 | Next_Formal (F1); | |
426 | Next_Formal (F2); | |
427 | end loop; | |
428 | end; | |
429 | ||
6d7e5c54 AC |
430 | else |
431 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
432 | end if; | |
433 | ||
0b5b2bbc | 434 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 435 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
436 | |
437 | else | |
a52e6d7e AC |
438 | -- An expression function that is not a completion is not a |
439 | -- subprogram declaration, and thus cannot appear in a protected | |
440 | -- definition. | |
441 | ||
442 | if Nkind (Parent (N)) = N_Protected_Definition then | |
443 | Error_Msg_N | |
444 | ("an expression function is not a legal protected operation", N); | |
445 | end if; | |
446 | ||
d2b10647 | 447 | New_Decl := |
d2d4b355 | 448 | Make_Subprogram_Declaration (Loc, Specification => Spec); |
804ff4c3 | 449 | |
d2b10647 | 450 | Rewrite (N, New_Decl); |
c0cdbd39 AC |
451 | |
452 | -- Correct the parent pointer of the aspect specification list to | |
453 | -- reference the rewritten node. | |
454 | ||
455 | if Has_Aspects (N) then | |
456 | Set_Parent (Aspect_Specifications (N), N); | |
457 | end if; | |
458 | ||
b0186f71 | 459 | Analyze (N); |
d2b10647 ES |
460 | Set_Is_Inlined (Defining_Entity (New_Decl)); |
461 | ||
6d7e5c54 AC |
462 | -- To prevent premature freeze action, insert the new body at the end |
463 | -- of the current declarations, or at the end of the package spec. | |
b913199e | 464 | -- However, resolve usage names now, to prevent spurious visibility |
ad4e3362 ES |
465 | -- on later entities. Note that the function can now be called in |
466 | -- the current declarative part, which will appear to be prior to | |
467 | -- the presence of the body in the code. There are nevertheless no | |
468 | -- order of elaboration issues because all name resolution has taken | |
469 | -- place at the point of declaration. | |
6d7e5c54 AC |
470 | |
471 | declare | |
e876c43a AC |
472 | Decls : List_Id := List_Containing (N); |
473 | Par : constant Node_Id := Parent (Decls); | |
b913199e | 474 | Id : constant Entity_Id := Defining_Entity (New_Decl); |
6d7e5c54 AC |
475 | |
476 | begin | |
477 | if Nkind (Par) = N_Package_Specification | |
8fde064e AC |
478 | and then Decls = Visible_Declarations (Par) |
479 | and then Present (Private_Declarations (Par)) | |
480 | and then not Is_Empty_List (Private_Declarations (Par)) | |
6d7e5c54 AC |
481 | then |
482 | Decls := Private_Declarations (Par); | |
483 | end if; | |
484 | ||
485 | Insert_After (Last (Decls), New_Body); | |
b913199e AC |
486 | Push_Scope (Id); |
487 | Install_Formals (Id); | |
3a8e3f63 | 488 | |
d8a764c4 AC |
489 | -- Preanalyze the expression for name capture, except in an |
490 | -- instance, where this has been done during generic analysis, | |
491 | -- and will be redone when analyzing the body. | |
845f06e2 AC |
492 | |
493 | declare | |
4058ddcc AC |
494 | Expr : constant Node_Id := Expression (Ret); |
495 | ||
845f06e2 AC |
496 | begin |
497 | Set_Parent (Expr, Ret); | |
4058ddcc | 498 | |
d8a764c4 AC |
499 | if not In_Instance then |
500 | Preanalyze_Spec_Expression (Expr, Etype (Id)); | |
501 | end if; | |
845f06e2 | 502 | end; |
3a8e3f63 | 503 | |
b913199e | 504 | End_Scope; |
6d7e5c54 | 505 | end; |
b0186f71 | 506 | end if; |
0b5b2bbc AC |
507 | |
508 | -- If the return expression is a static constant, we suppress warning | |
509 | -- messages on unused formals, which in most cases will be noise. | |
510 | ||
511 | Set_Is_Trivial_Subprogram (Defining_Entity (New_Body), | |
512 | Is_OK_Static_Expression (Expr)); | |
b0186f71 AC |
513 | end Analyze_Expression_Function; |
514 | ||
ec4867fa ES |
515 | ---------------------------------------- |
516 | -- Analyze_Extended_Return_Statement -- | |
517 | ---------------------------------------- | |
518 | ||
519 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
520 | begin | |
5d37ba92 | 521 | Analyze_Return_Statement (N); |
ec4867fa ES |
522 | end Analyze_Extended_Return_Statement; |
523 | ||
996ae0b0 RK |
524 | ---------------------------- |
525 | -- Analyze_Function_Call -- | |
526 | ---------------------------- | |
527 | ||
528 | procedure Analyze_Function_Call (N : Node_Id) is | |
a7e68e7f HK |
529 | Actuals : constant List_Id := Parameter_Associations (N); |
530 | Func_Nam : constant Node_Id := Name (N); | |
531 | Actual : Node_Id; | |
532 | ||
996ae0b0 | 533 | begin |
a7e68e7f | 534 | Analyze (Func_Nam); |
996ae0b0 | 535 | |
3e7302c3 AC |
536 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
537 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
538 | -- has been analyzed and we just return. | |
82c80734 | 539 | |
a7e68e7f HK |
540 | if Nkind (Func_Nam) = N_Selected_Component |
541 | and then Name (N) /= Func_Nam | |
82c80734 RD |
542 | and then Is_Rewrite_Substitution (N) |
543 | and then Present (Etype (N)) | |
544 | then | |
545 | return; | |
546 | end if; | |
547 | ||
996ae0b0 RK |
548 | -- If error analyzing name, then set Any_Type as result type and return |
549 | ||
a7e68e7f | 550 | if Etype (Func_Nam) = Any_Type then |
996ae0b0 RK |
551 | Set_Etype (N, Any_Type); |
552 | return; | |
553 | end if; | |
554 | ||
555 | -- Otherwise analyze the parameters | |
556 | ||
e24329cd YM |
557 | if Present (Actuals) then |
558 | Actual := First (Actuals); | |
996ae0b0 RK |
559 | while Present (Actual) loop |
560 | Analyze (Actual); | |
561 | Check_Parameterless_Call (Actual); | |
562 | Next (Actual); | |
563 | end loop; | |
564 | end if; | |
565 | ||
566 | Analyze_Call (N); | |
996ae0b0 RK |
567 | end Analyze_Function_Call; |
568 | ||
ec4867fa ES |
569 | ----------------------------- |
570 | -- Analyze_Function_Return -- | |
571 | ----------------------------- | |
572 | ||
573 | procedure Analyze_Function_Return (N : Node_Id) is | |
a7e68e7f HK |
574 | Loc : constant Source_Ptr := Sloc (N); |
575 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
576 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
ec4867fa | 577 | |
5d37ba92 | 578 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
579 | -- Function result subtype |
580 | ||
581 | procedure Check_Limited_Return (Expr : Node_Id); | |
582 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
583 | -- limited types. Used only for simple return statements. | |
584 | -- Expr is the expression returned. | |
585 | ||
586 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
587 | -- Check that the return_subtype_indication properly matches the result | |
588 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
589 | ||
590 | -------------------------- | |
591 | -- Check_Limited_Return -- | |
592 | -------------------------- | |
593 | ||
594 | procedure Check_Limited_Return (Expr : Node_Id) is | |
595 | begin | |
596 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
597 | -- removed and replaced by anonymous access results. This is an | |
598 | -- incompatibility with Ada 95. Not clear whether this should be | |
599 | -- enforced yet or perhaps controllable with special switch. ??? | |
600 | ||
ce72a9a3 AC |
601 | -- A limited interface that is not immutably limited is OK. |
602 | ||
603 | if Is_Limited_Interface (R_Type) | |
604 | and then | |
605 | not (Is_Task_Interface (R_Type) | |
606 | or else Is_Protected_Interface (R_Type) | |
607 | or else Is_Synchronized_Interface (R_Type)) | |
608 | then | |
609 | null; | |
610 | ||
611 | elsif Is_Limited_Type (R_Type) | |
612 | and then not Is_Interface (R_Type) | |
ec4867fa ES |
613 | and then Comes_From_Source (N) |
614 | and then not In_Instance_Body | |
2a31c32b | 615 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
616 | then |
617 | -- Error in Ada 2005 | |
618 | ||
0791fbe9 | 619 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
620 | and then not Debug_Flag_Dot_L |
621 | and then not GNAT_Mode | |
622 | then | |
623 | Error_Msg_N | |
624 | ("(Ada 2005) cannot copy object of a limited type " & | |
5d37ba92 | 625 | "(RM-2005 6.5(5.5/2))", Expr); |
e0ae93e2 | 626 | |
51245e2d | 627 | if Is_Limited_View (R_Type) then |
ec4867fa ES |
628 | Error_Msg_N |
629 | ("\return by reference not permitted in Ada 2005", Expr); | |
630 | end if; | |
631 | ||
632 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
633 | -- incompatibility. | |
634 | ||
635 | -- In GNAT mode, this is just a warning, to allow it to be | |
636 | -- evilly turned off. Otherwise it is a real error. | |
637 | ||
9694c039 AC |
638 | -- In a generic context, simplify the warning because it makes |
639 | -- no sense to discuss pass-by-reference or copy. | |
640 | ||
ec4867fa | 641 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
642 | if Inside_A_Generic then |
643 | Error_Msg_N | |
885c4871 | 644 | ("return of limited object not permitted in Ada 2005 " |
dbfeb4fa | 645 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
9694c039 | 646 | |
51245e2d | 647 | elsif Is_Limited_View (R_Type) then |
ec4867fa | 648 | Error_Msg_N |
20261dc1 | 649 | ("return by reference not permitted in Ada 2005 " |
dbfeb4fa | 650 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
651 | else |
652 | Error_Msg_N | |
20261dc1 | 653 | ("cannot copy object of a limited type in Ada 2005 " |
dbfeb4fa | 654 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
655 | end if; |
656 | ||
657 | -- Ada 95 mode, compatibility warnings disabled | |
658 | ||
659 | else | |
660 | return; -- skip continuation messages below | |
661 | end if; | |
662 | ||
9694c039 AC |
663 | if not Inside_A_Generic then |
664 | Error_Msg_N | |
665 | ("\consider switching to return of access type", Expr); | |
666 | Explain_Limited_Type (R_Type, Expr); | |
667 | end if; | |
ec4867fa ES |
668 | end if; |
669 | end Check_Limited_Return; | |
670 | ||
671 | ------------------------------------- | |
672 | -- Check_Return_Subtype_Indication -- | |
673 | ------------------------------------- | |
674 | ||
675 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
676 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
677 | ||
678 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
679 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
680 | |
681 | Subtype_Ind : constant Node_Id := | |
682 | Object_Definition (Original_Node (Obj_Decl)); | |
683 | ||
7f568bfa AC |
684 | R_Type_Is_Anon_Access : constant Boolean := |
685 | Ekind_In (R_Type, | |
686 | E_Anonymous_Access_Subprogram_Type, | |
687 | E_Anonymous_Access_Protected_Subprogram_Type, | |
688 | E_Anonymous_Access_Type); | |
ec4867fa ES |
689 | -- True if return type of the function is an anonymous access type |
690 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
691 | ||
7f568bfa AC |
692 | R_Stm_Type_Is_Anon_Access : constant Boolean := |
693 | Ekind_In (R_Stm_Type, | |
694 | E_Anonymous_Access_Subprogram_Type, | |
695 | E_Anonymous_Access_Protected_Subprogram_Type, | |
696 | E_Anonymous_Access_Type); | |
ec4867fa ES |
697 | -- True if type of the return object is an anonymous access type |
698 | ||
7f568bfa AC |
699 | procedure Error_No_Match (N : Node_Id); |
700 | -- Output error messages for case where types do not statically | |
701 | -- match. N is the location for the messages. | |
702 | ||
703 | -------------------- | |
704 | -- Error_No_Match -- | |
705 | -------------------- | |
706 | ||
707 | procedure Error_No_Match (N : Node_Id) is | |
708 | begin | |
709 | Error_Msg_N | |
710 | ("subtype must statically match function result subtype", N); | |
711 | ||
712 | if not Predicates_Match (R_Stm_Type, R_Type) then | |
713 | Error_Msg_Node_2 := R_Type; | |
714 | Error_Msg_NE | |
715 | ("\predicate of & does not match predicate of &", | |
716 | N, R_Stm_Type); | |
717 | end if; | |
718 | end Error_No_Match; | |
719 | ||
720 | -- Start of processing for Check_Return_Subtype_Indication | |
721 | ||
ec4867fa | 722 | begin |
7665e4bd | 723 | -- First, avoid cascaded errors |
ec4867fa ES |
724 | |
725 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
726 | return; | |
727 | end if; | |
728 | ||
729 | -- "return access T" case; check that the return statement also has | |
730 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 731 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
732 | |
733 | if R_Type_Is_Anon_Access then | |
734 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
735 | if |
736 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 737 | then |
53cf4600 ES |
738 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
739 | Base_Type (Designated_Type (R_Type)) | |
740 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
741 | then | |
7f568bfa | 742 | Error_No_Match (Subtype_Mark (Subtype_Ind)); |
53cf4600 ES |
743 | end if; |
744 | ||
745 | else | |
746 | -- For two anonymous access to subprogram types, the | |
747 | -- types themselves must be type conformant. | |
748 | ||
749 | if not Conforming_Types | |
750 | (R_Stm_Type, R_Type, Fully_Conformant) | |
751 | then | |
7f568bfa | 752 | Error_No_Match (Subtype_Ind); |
53cf4600 | 753 | end if; |
ec4867fa | 754 | end if; |
0a36105d | 755 | |
ec4867fa ES |
756 | else |
757 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
758 | end if; | |
759 | ||
6cce2156 GD |
760 | -- If the return object is of an anonymous access type, then report |
761 | -- an error if the function's result type is not also anonymous. | |
762 | ||
763 | elsif R_Stm_Type_Is_Anon_Access | |
764 | and then not R_Type_Is_Anon_Access | |
765 | then | |
766 | Error_Msg_N ("anonymous access not allowed for function with " & | |
767 | "named access result", Subtype_Ind); | |
768 | ||
81d93365 AC |
769 | -- Subtype indication case: check that the return object's type is |
770 | -- covered by the result type, and that the subtypes statically match | |
771 | -- when the result subtype is constrained. Also handle record types | |
772 | -- with unknown discriminants for which we have built the underlying | |
773 | -- record view. Coverage is needed to allow specific-type return | |
774 | -- objects when the result type is class-wide (see AI05-32). | |
775 | ||
776 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 777 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
778 | and then |
779 | Covers | |
780 | (Base_Type (R_Type), | |
781 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
782 | then |
783 | -- A null exclusion may be present on the return type, on the | |
784 | -- function specification, on the object declaration or on the | |
785 | -- subtype itself. | |
ec4867fa | 786 | |
21d27997 RD |
787 | if Is_Access_Type (R_Type) |
788 | and then | |
789 | (Can_Never_Be_Null (R_Type) | |
790 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
791 | Can_Never_Be_Null (R_Stm_Type) | |
792 | then | |
7f568bfa | 793 | Error_No_Match (Subtype_Ind); |
21d27997 RD |
794 | end if; |
795 | ||
105b5e65 | 796 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
797 | |
798 | if Is_Constrained (R_Type) | |
799 | or else Is_Access_Type (R_Type) | |
800 | then | |
ec4867fa | 801 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
7f568bfa | 802 | Error_No_Match (Subtype_Ind); |
ec4867fa ES |
803 | end if; |
804 | end if; | |
805 | ||
ff7139c3 AC |
806 | elsif Etype (Base_Type (R_Type)) = R_Stm_Type |
807 | and then Is_Null_Extension (Base_Type (R_Type)) | |
808 | then | |
809 | null; | |
810 | ||
ec4867fa ES |
811 | else |
812 | Error_Msg_N | |
813 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
814 | end if; | |
815 | end Check_Return_Subtype_Indication; | |
816 | ||
817 | --------------------- | |
818 | -- Local Variables -- | |
819 | --------------------- | |
820 | ||
821 | Expr : Node_Id; | |
822 | ||
823 | -- Start of processing for Analyze_Function_Return | |
824 | ||
825 | begin | |
826 | Set_Return_Present (Scope_Id); | |
827 | ||
5d37ba92 | 828 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 829 | Expr := Expression (N); |
4ee646da | 830 | |
e917aec2 RD |
831 | -- Guard against a malformed expression. The parser may have tried to |
832 | -- recover but the node is not analyzable. | |
4ee646da AC |
833 | |
834 | if Nkind (Expr) = N_Error then | |
835 | Set_Etype (Expr, Any_Type); | |
836 | Expander_Mode_Save_And_Set (False); | |
837 | return; | |
838 | ||
839 | else | |
0180fd26 AC |
840 | -- The resolution of a controlled [extension] aggregate associated |
841 | -- with a return statement creates a temporary which needs to be | |
842 | -- finalized on function exit. Wrap the return statement inside a | |
843 | -- block so that the finalization machinery can detect this case. | |
844 | -- This early expansion is done only when the return statement is | |
845 | -- not part of a handled sequence of statements. | |
846 | ||
847 | if Nkind_In (Expr, N_Aggregate, | |
848 | N_Extension_Aggregate) | |
849 | and then Needs_Finalization (R_Type) | |
850 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
851 | then | |
852 | Rewrite (N, | |
853 | Make_Block_Statement (Loc, | |
854 | Handled_Statement_Sequence => | |
855 | Make_Handled_Sequence_Of_Statements (Loc, | |
856 | Statements => New_List (Relocate_Node (N))))); | |
857 | ||
858 | Analyze (N); | |
859 | return; | |
860 | end if; | |
861 | ||
4ee646da AC |
862 | Analyze_And_Resolve (Expr, R_Type); |
863 | Check_Limited_Return (Expr); | |
864 | end if; | |
ec4867fa | 865 | |
ad05f2e9 | 866 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 867 | |
fe5d3068 | 868 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
869 | and then |
870 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 871 | or else Present (Next (N))) |
607d0635 | 872 | then |
2ba431e5 | 873 | Check_SPARK_Restriction |
fe5d3068 | 874 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
875 | end if; |
876 | ||
ec4867fa | 877 | else |
2ba431e5 | 878 | Check_SPARK_Restriction ("extended RETURN is not allowed", N); |
607d0635 | 879 | |
ec4867fa ES |
880 | -- Analyze parts specific to extended_return_statement: |
881 | ||
882 | declare | |
de6cad7c | 883 | Obj_Decl : constant Node_Id := |
b9daa96e | 884 | Last (Return_Object_Declarations (N)); |
de6cad7c | 885 | Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
b9daa96e | 886 | HSS : constant Node_Id := Handled_Statement_Sequence (N); |
ec4867fa ES |
887 | |
888 | begin | |
889 | Expr := Expression (Obj_Decl); | |
890 | ||
891 | -- Note: The check for OK_For_Limited_Init will happen in | |
892 | -- Analyze_Object_Declaration; we treat it as a normal | |
893 | -- object declaration. | |
894 | ||
cd1c668b | 895 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
896 | Analyze (Obj_Decl); |
897 | ||
ec4867fa ES |
898 | Check_Return_Subtype_Indication (Obj_Decl); |
899 | ||
900 | if Present (HSS) then | |
901 | Analyze (HSS); | |
902 | ||
903 | if Present (Exception_Handlers (HSS)) then | |
904 | ||
905 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
906 | -- Probably by creating an actual N_Block_Statement. | |
907 | -- Probably in Expand. | |
908 | ||
909 | null; | |
910 | end if; | |
911 | end if; | |
912 | ||
9337aa0a AC |
913 | -- Mark the return object as referenced, since the return is an |
914 | -- implicit reference of the object. | |
915 | ||
916 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
917 | ||
ec4867fa | 918 | Check_References (Stm_Entity); |
de6cad7c AC |
919 | |
920 | -- Check RM 6.5 (5.9/3) | |
921 | ||
922 | if Has_Aliased then | |
923 | if Ada_Version < Ada_2012 then | |
dbfeb4fa RD |
924 | |
925 | -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? | |
926 | -- Can it really happen (extended return???) | |
927 | ||
928 | Error_Msg_N | |
929 | ("aliased only allowed for limited" | |
de6cad7c AC |
930 | & " return objects in Ada 2012?", N); |
931 | ||
51245e2d | 932 | elsif not Is_Limited_View (R_Type) then |
de6cad7c AC |
933 | Error_Msg_N ("aliased only allowed for limited" |
934 | & " return objects", N); | |
935 | end if; | |
936 | end if; | |
ec4867fa ES |
937 | end; |
938 | end if; | |
939 | ||
21d27997 | 940 | -- Case of Expr present |
5d37ba92 | 941 | |
ec4867fa | 942 | if Present (Expr) |
21d27997 | 943 | |
8fde064e | 944 | -- Defend against previous errors |
21d27997 RD |
945 | |
946 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 947 | and then Present (Etype (Expr)) |
ec4867fa | 948 | then |
5d37ba92 ES |
949 | -- Apply constraint check. Note that this is done before the implicit |
950 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 951 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
952 | -- with null-excluding expressions found in return statements. |
953 | ||
954 | Apply_Constraint_Check (Expr, R_Type); | |
955 | ||
956 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
957 | -- type, apply an implicit conversion of the expression to that type | |
958 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 959 | |
0791fbe9 | 960 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
961 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
962 | then | |
963 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
964 | Analyze_And_Resolve (Expr, R_Type); | |
b6b5cca8 AC |
965 | |
966 | -- If this is a local anonymous access to subprogram, the | |
967 | -- accessibility check can be applied statically. The return is | |
968 | -- illegal if the access type of the return expression is declared | |
969 | -- inside of the subprogram (except if it is the subtype indication | |
970 | -- of an extended return statement). | |
971 | ||
972 | elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then | |
973 | if not Comes_From_Source (Current_Scope) | |
974 | or else Ekind (Current_Scope) = E_Return_Statement | |
975 | then | |
976 | null; | |
977 | ||
978 | elsif | |
979 | Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) | |
980 | then | |
981 | Error_Msg_N ("cannot return local access to subprogram", N); | |
982 | end if; | |
ec4867fa ES |
983 | end if; |
984 | ||
21d27997 RD |
985 | -- If the result type is class-wide, then check that the return |
986 | -- expression's type is not declared at a deeper level than the | |
987 | -- function (RM05-6.5(5.6/2)). | |
988 | ||
0791fbe9 | 989 | if Ada_Version >= Ada_2005 |
21d27997 RD |
990 | and then Is_Class_Wide_Type (R_Type) |
991 | then | |
992 | if Type_Access_Level (Etype (Expr)) > | |
993 | Subprogram_Access_Level (Scope_Id) | |
994 | then | |
995 | Error_Msg_N | |
996 | ("level of return expression type is deeper than " & | |
997 | "class-wide function!", Expr); | |
998 | end if; | |
999 | end if; | |
1000 | ||
4755cce9 JM |
1001 | -- Check incorrect use of dynamically tagged expression |
1002 | ||
1003 | if Is_Tagged_Type (R_Type) then | |
1004 | Check_Dynamically_Tagged_Expression | |
1005 | (Expr => Expr, | |
1006 | Typ => R_Type, | |
1007 | Related_Nod => N); | |
ec4867fa ES |
1008 | end if; |
1009 | ||
ec4867fa ES |
1010 | -- ??? A real run-time accessibility check is needed in cases |
1011 | -- involving dereferences of access parameters. For now we just | |
1012 | -- check the static cases. | |
1013 | ||
0791fbe9 | 1014 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
51245e2d | 1015 | and then Is_Limited_View (Etype (Scope_Id)) |
ec4867fa ES |
1016 | and then Object_Access_Level (Expr) > |
1017 | Subprogram_Access_Level (Scope_Id) | |
1018 | then | |
9694c039 AC |
1019 | -- Suppress the message in a generic, where the rewriting |
1020 | -- is irrelevant. | |
1021 | ||
1022 | if Inside_A_Generic then | |
1023 | null; | |
1024 | ||
1025 | else | |
1026 | Rewrite (N, | |
1027 | Make_Raise_Program_Error (Loc, | |
1028 | Reason => PE_Accessibility_Check_Failed)); | |
1029 | Analyze (N); | |
1030 | ||
43417b90 | 1031 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
1032 | Error_Msg_N ("cannot return a local value by reference<<", N); |
1033 | Error_Msg_NE ("\& [<<", N, Standard_Program_Error); | |
9694c039 | 1034 | end if; |
ec4867fa | 1035 | end if; |
5d37ba92 ES |
1036 | |
1037 | if Known_Null (Expr) | |
1038 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
1039 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
1040 | then | |
1041 | Apply_Compile_Time_Constraint_Error | |
1042 | (N => Expr, | |
1043 | Msg => "(Ada 2005) null not allowed for " | |
dbfeb4fa | 1044 | & "null-excluding return??", |
5d37ba92 ES |
1045 | Reason => CE_Null_Not_Allowed); |
1046 | end if; | |
ec4867fa ES |
1047 | end if; |
1048 | end Analyze_Function_Return; | |
1049 | ||
996ae0b0 RK |
1050 | ------------------------------------- |
1051 | -- Analyze_Generic_Subprogram_Body -- | |
1052 | ------------------------------------- | |
1053 | ||
1054 | procedure Analyze_Generic_Subprogram_Body | |
1055 | (N : Node_Id; | |
1056 | Gen_Id : Entity_Id) | |
1057 | is | |
fbf5a39b | 1058 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 1059 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 1060 | Body_Id : Entity_Id; |
996ae0b0 | 1061 | New_N : Node_Id; |
fbf5a39b | 1062 | Spec : Node_Id; |
996ae0b0 RK |
1063 | |
1064 | begin | |
82c80734 RD |
1065 | -- Copy body and disable expansion while analyzing the generic For a |
1066 | -- stub, do not copy the stub (which would load the proper body), this | |
1067 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
1068 | |
1069 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
1070 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
1071 | Rewrite (N, New_N); | |
1072 | Start_Generic; | |
1073 | end if; | |
1074 | ||
1075 | Spec := Specification (N); | |
1076 | ||
1077 | -- Within the body of the generic, the subprogram is callable, and | |
1078 | -- behaves like the corresponding non-generic unit. | |
1079 | ||
fbf5a39b | 1080 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
1081 | |
1082 | if Kind = E_Generic_Procedure | |
1083 | and then Nkind (Spec) /= N_Procedure_Specification | |
1084 | then | |
fbf5a39b | 1085 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
1086 | return; |
1087 | ||
1088 | elsif Kind = E_Generic_Function | |
1089 | and then Nkind (Spec) /= N_Function_Specification | |
1090 | then | |
fbf5a39b | 1091 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
1092 | return; |
1093 | end if; | |
1094 | ||
fbf5a39b | 1095 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
1096 | |
1097 | if Has_Completion (Gen_Id) | |
1098 | and then Nkind (Parent (N)) /= N_Subunit | |
1099 | then | |
1100 | Error_Msg_N ("duplicate generic body", N); | |
1101 | return; | |
1102 | else | |
1103 | Set_Has_Completion (Gen_Id); | |
1104 | end if; | |
1105 | ||
1106 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1107 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1108 | else | |
1109 | Set_Corresponding_Spec (N, Gen_Id); | |
1110 | end if; | |
1111 | ||
1112 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1113 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1114 | end if; | |
1115 | ||
1116 | -- Make generic parameters immediately visible in the body. They are | |
1117 | -- needed to process the formals declarations. Then make the formals | |
1118 | -- visible in a separate step. | |
1119 | ||
0a36105d | 1120 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1121 | |
1122 | declare | |
1123 | E : Entity_Id; | |
1124 | First_Ent : Entity_Id; | |
1125 | ||
1126 | begin | |
1127 | First_Ent := First_Entity (Gen_Id); | |
1128 | ||
1129 | E := First_Ent; | |
1130 | while Present (E) and then not Is_Formal (E) loop | |
1131 | Install_Entity (E); | |
1132 | Next_Entity (E); | |
1133 | end loop; | |
1134 | ||
1135 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1136 | ||
1137 | -- Now generic formals are visible, and the specification can be | |
1138 | -- analyzed, for subsequent conformance check. | |
1139 | ||
fbf5a39b | 1140 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1141 | |
fbf5a39b | 1142 | -- Make formal parameters visible |
996ae0b0 RK |
1143 | |
1144 | if Present (E) then | |
1145 | ||
fbf5a39b AC |
1146 | -- E is the first formal parameter, we loop through the formals |
1147 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1148 | |
1149 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1150 | while Present (E) loop |
1151 | Install_Entity (E); | |
1152 | Next_Formal (E); | |
1153 | end loop; | |
1154 | end if; | |
1155 | ||
e895b435 | 1156 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1157 | |
ec4867fa | 1158 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
ea3c0651 | 1159 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
ec4867fa ES |
1160 | Set_Ekind (Body_Id, E_Subprogram_Body); |
1161 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1162 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1163 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
fbf5a39b AC |
1164 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1165 | ||
1166 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1167 | ||
e895b435 | 1168 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1169 | |
1170 | Set_Ekind (Gen_Id, Kind); | |
1171 | Set_Ekind (Body_Id, Kind); | |
1172 | ||
1173 | if Present (First_Ent) then | |
1174 | Set_First_Entity (Gen_Id, First_Ent); | |
1175 | end if; | |
1176 | ||
1177 | End_Scope; | |
1178 | return; | |
1179 | end if; | |
996ae0b0 | 1180 | |
82c80734 RD |
1181 | -- If this is a compilation unit, it must be made visible explicitly, |
1182 | -- because the compilation of the declaration, unlike other library | |
1183 | -- unit declarations, does not. If it is not a unit, the following | |
1184 | -- is redundant but harmless. | |
996ae0b0 RK |
1185 | |
1186 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1187 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1188 | |
ec4867fa ES |
1189 | if Is_Child_Unit (Gen_Id) then |
1190 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1191 | end if; | |
1192 | ||
996ae0b0 | 1193 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 | 1194 | |
ea3c0651 AC |
1195 | -- Deal with [refined] preconditions, postconditions, Contract_Cases, |
1196 | -- invariants and predicates associated with the body and its spec. | |
1197 | -- Note that this is not pure expansion as Expand_Subprogram_Contract | |
1198 | -- prepares the contract assertions for generic subprograms or for | |
1199 | -- ASIS. Do not generate contract checks in SPARK mode. | |
483361a6 | 1200 | |
f5da7a97 | 1201 | if not GNATprove_Mode then |
ea3c0651 | 1202 | Expand_Subprogram_Contract (N, Gen_Id, Body_Id); |
483361a6 | 1203 | end if; |
0dabde3a ES |
1204 | |
1205 | -- If the generic unit carries pre- or post-conditions, copy them | |
1206 | -- to the original generic tree, so that they are properly added | |
1207 | -- to any instantiation. | |
1208 | ||
1209 | declare | |
1210 | Orig : constant Node_Id := Original_Node (N); | |
1211 | Cond : Node_Id; | |
1212 | ||
1213 | begin | |
1214 | Cond := First (Declarations (N)); | |
1215 | while Present (Cond) loop | |
1216 | if Nkind (Cond) = N_Pragma | |
1217 | and then Pragma_Name (Cond) = Name_Check | |
1218 | then | |
1219 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1220 | ||
1221 | elsif Nkind (Cond) = N_Pragma | |
1222 | and then Pragma_Name (Cond) = Name_Postcondition | |
1223 | then | |
1224 | Set_Ekind (Defining_Entity (Orig), Ekind (Gen_Id)); | |
1225 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1226 | else | |
1227 | exit; | |
1228 | end if; | |
1229 | ||
1230 | Next (Cond); | |
1231 | end loop; | |
1232 | end; | |
1233 | ||
cbee4f74 AC |
1234 | Check_SPARK_Mode_In_Generic (N); |
1235 | ||
579847c2 AC |
1236 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
1237 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
1238 | ||
996ae0b0 RK |
1239 | Analyze_Declarations (Declarations (N)); |
1240 | Check_Completion; | |
1241 | Analyze (Handled_Statement_Sequence (N)); | |
1242 | ||
1243 | Save_Global_References (Original_Node (N)); | |
1244 | ||
82c80734 RD |
1245 | -- Prior to exiting the scope, include generic formals again (if any |
1246 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1247 | |
1248 | if Present (First_Ent) then | |
1249 | Set_First_Entity (Gen_Id, First_Ent); | |
1250 | end if; | |
1251 | ||
fbf5a39b | 1252 | Check_References (Gen_Id); |
996ae0b0 RK |
1253 | end; |
1254 | ||
e6f69614 | 1255 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1256 | End_Scope; |
1257 | Check_Subprogram_Order (N); | |
1258 | ||
e895b435 | 1259 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1260 | |
1261 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1262 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1263 | |
1264 | if Style_Check then | |
1265 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1266 | end if; | |
13d923cc | 1267 | |
996ae0b0 | 1268 | End_Generic; |
996ae0b0 RK |
1269 | end Analyze_Generic_Subprogram_Body; |
1270 | ||
4d8f3296 ES |
1271 | ---------------------------- |
1272 | -- Analyze_Null_Procedure -- | |
1273 | ---------------------------- | |
1274 | ||
1275 | procedure Analyze_Null_Procedure | |
1276 | (N : Node_Id; | |
1277 | Is_Completion : out Boolean) | |
1278 | is | |
1279 | Loc : constant Source_Ptr := Sloc (N); | |
1280 | Spec : constant Node_Id := Specification (N); | |
1281 | Designator : Entity_Id; | |
1282 | Form : Node_Id; | |
1283 | Null_Body : Node_Id := Empty; | |
1284 | Prev : Entity_Id; | |
1285 | ||
1286 | begin | |
1287 | -- Capture the profile of the null procedure before analysis, for | |
1288 | -- expansion at the freeze point and at each point of call. The body is | |
1289 | -- used if the procedure has preconditions, or if it is a completion. In | |
1290 | -- the first case the body is analyzed at the freeze point, in the other | |
1291 | -- it replaces the null procedure declaration. | |
1292 | ||
1293 | Null_Body := | |
1294 | Make_Subprogram_Body (Loc, | |
1295 | Specification => New_Copy_Tree (Spec), | |
8c35b40a | 1296 | Declarations => New_List, |
4d8f3296 ES |
1297 | Handled_Statement_Sequence => |
1298 | Make_Handled_Sequence_Of_Statements (Loc, | |
1299 | Statements => New_List (Make_Null_Statement (Loc)))); | |
1300 | ||
1301 | -- Create new entities for body and formals | |
1302 | ||
1303 | Set_Defining_Unit_Name (Specification (Null_Body), | |
1304 | Make_Defining_Identifier (Loc, Chars (Defining_Entity (N)))); | |
1305 | ||
1306 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1307 | while Present (Form) loop | |
1308 | Set_Defining_Identifier (Form, | |
1309 | Make_Defining_Identifier (Loc, Chars (Defining_Identifier (Form)))); | |
1310 | Next (Form); | |
1311 | end loop; | |
1312 | ||
1313 | -- Determine whether the null procedure may be a completion of a generic | |
1314 | -- suprogram, in which case we use the new null body as the completion | |
1315 | -- and set minimal semantic information on the original declaration, | |
1316 | -- which is rewritten as a null statement. | |
1317 | ||
1318 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
1319 | ||
1320 | if Present (Prev) and then Is_Generic_Subprogram (Prev) then | |
1321 | Insert_Before (N, Null_Body); | |
1322 | Set_Ekind (Defining_Entity (N), Ekind (Prev)); | |
1323 | Set_Contract (Defining_Entity (N), Make_Contract (Loc)); | |
1324 | ||
1325 | Rewrite (N, Make_Null_Statement (Loc)); | |
1326 | Analyze_Generic_Subprogram_Body (Null_Body, Prev); | |
1327 | Is_Completion := True; | |
1328 | return; | |
1329 | ||
1330 | else | |
4d8f3296 ES |
1331 | -- Resolve the types of the formals now, because the freeze point |
1332 | -- may appear in a different context, e.g. an instantiation. | |
1333 | ||
1334 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1335 | while Present (Form) loop | |
1336 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
1337 | Find_Type (Parameter_Type (Form)); | |
1338 | ||
1339 | elsif | |
1340 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
1341 | then | |
1342 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
1343 | ||
1344 | else | |
1345 | -- The case of a null procedure with a formal that is an | |
1346 | -- access_to_subprogram type, and that is used as an actual | |
1347 | -- in an instantiation is left to the enthusiastic reader. | |
1348 | ||
1349 | null; | |
1350 | end if; | |
1351 | ||
1352 | Next (Form); | |
1353 | end loop; | |
1354 | end if; | |
1355 | ||
1356 | -- If there are previous overloadable entities with the same name, | |
1357 | -- check whether any of them is completed by the null procedure. | |
1358 | ||
1359 | if Present (Prev) and then Is_Overloadable (Prev) then | |
1360 | Designator := Analyze_Subprogram_Specification (Spec); | |
1361 | Prev := Find_Corresponding_Spec (N); | |
1362 | end if; | |
1363 | ||
1364 | if No (Prev) or else not Comes_From_Source (Prev) then | |
1365 | Designator := Analyze_Subprogram_Specification (Spec); | |
1366 | Set_Has_Completion (Designator); | |
1367 | ||
1368 | -- Signal to caller that this is a procedure declaration | |
1369 | ||
1370 | Is_Completion := False; | |
1371 | ||
1372 | -- Null procedures are always inlined, but generic formal subprograms | |
1373 | -- which appear as such in the internal instance of formal packages, | |
1374 | -- need no completion and are not marked Inline. | |
1375 | ||
1376 | if Expander_Active | |
1377 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
1378 | then | |
1379 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
1380 | Set_Body_To_Inline (N, Null_Body); | |
1381 | Set_Is_Inlined (Designator); | |
1382 | end if; | |
1383 | ||
1384 | else | |
1385 | -- The null procedure is a completion | |
1386 | ||
1387 | Is_Completion := True; | |
1388 | ||
1389 | if Expander_Active then | |
1390 | Rewrite (N, Null_Body); | |
1391 | Analyze (N); | |
1392 | ||
1393 | else | |
1394 | Designator := Analyze_Subprogram_Specification (Spec); | |
1395 | Set_Has_Completion (Designator); | |
1396 | Set_Has_Completion (Prev); | |
1397 | end if; | |
1398 | end if; | |
1399 | end Analyze_Null_Procedure; | |
1400 | ||
996ae0b0 RK |
1401 | ----------------------------- |
1402 | -- Analyze_Operator_Symbol -- | |
1403 | ----------------------------- | |
1404 | ||
82c80734 RD |
1405 | -- An operator symbol such as "+" or "and" may appear in context where the |
1406 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1407 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1408 | -- generates this node, and the semantics does the disambiguation. Other | |
1409 | -- such case are actuals in an instantiation, the generic unit in an | |
1410 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1411 | |
1412 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1413 | Par : constant Node_Id := Parent (N); | |
1414 | ||
1415 | begin | |
1f0b1e48 | 1416 | if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
996ae0b0 | 1417 | or else Nkind (Par) = N_Function_Instantiation |
1f0b1e48 | 1418 | or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
996ae0b0 | 1419 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1f0b1e48 | 1420 | and then not Is_Pragma_String_Literal (Par)) |
996ae0b0 | 1421 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
800621e0 RD |
1422 | or else (Nkind (Par) = N_Attribute_Reference |
1423 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1424 | then |
1425 | Find_Direct_Name (N); | |
1426 | ||
1427 | else | |
1428 | Change_Operator_Symbol_To_String_Literal (N); | |
1429 | Analyze (N); | |
1430 | end if; | |
1431 | end Analyze_Operator_Symbol; | |
1432 | ||
1433 | ----------------------------------- | |
1434 | -- Analyze_Parameter_Association -- | |
1435 | ----------------------------------- | |
1436 | ||
1437 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1438 | begin | |
1439 | Analyze (Explicit_Actual_Parameter (N)); | |
1440 | end Analyze_Parameter_Association; | |
1441 | ||
1442 | ---------------------------- | |
1443 | -- Analyze_Procedure_Call -- | |
1444 | ---------------------------- | |
1445 | ||
1446 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
1447 | Loc : constant Source_Ptr := Sloc (N); | |
1448 | P : constant Node_Id := Name (N); | |
1449 | Actuals : constant List_Id := Parameter_Associations (N); | |
1450 | Actual : Node_Id; | |
1451 | New_N : Node_Id; | |
1452 | ||
1453 | procedure Analyze_Call_And_Resolve; | |
1454 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1455 | -- At end, check illegal order dependence. |
996ae0b0 | 1456 | |
fbf5a39b AC |
1457 | ------------------------------ |
1458 | -- Analyze_Call_And_Resolve -- | |
1459 | ------------------------------ | |
1460 | ||
996ae0b0 RK |
1461 | procedure Analyze_Call_And_Resolve is |
1462 | begin | |
1463 | if Nkind (N) = N_Procedure_Call_Statement then | |
1464 | Analyze_Call (N); | |
1465 | Resolve (N, Standard_Void_Type); | |
1466 | else | |
1467 | Analyze (N); | |
1468 | end if; | |
1469 | end Analyze_Call_And_Resolve; | |
1470 | ||
1471 | -- Start of processing for Analyze_Procedure_Call | |
1472 | ||
1473 | begin | |
1474 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1475 | -- a procedure call or an entry call. The prefix may denote an access | |
1476 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1477 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1478 | -- then the construct denotes a call to a member of an entire family. |
1479 | -- If the prefix is a simple name, it may still denote a call to a | |
1480 | -- parameterless member of an entry family. Resolution of these various | |
1481 | -- interpretations is delicate. | |
1482 | ||
1483 | Analyze (P); | |
1484 | ||
758c442c GD |
1485 | -- If this is a call of the form Obj.Op, the call may have been |
1486 | -- analyzed and possibly rewritten into a block, in which case | |
1487 | -- we are done. | |
1488 | ||
1489 | if Analyzed (N) then | |
1490 | return; | |
1491 | end if; | |
1492 | ||
7415029d AC |
1493 | -- If there is an error analyzing the name (which may have been |
1494 | -- rewritten if the original call was in prefix notation) then error | |
1495 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1496 | |
21791d97 | 1497 | if Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
996ae0b0 RK |
1498 | Set_Etype (N, Any_Type); |
1499 | return; | |
1500 | end if; | |
1501 | ||
1502 | -- Otherwise analyze the parameters | |
1503 | ||
1504 | if Present (Actuals) then | |
1505 | Actual := First (Actuals); | |
1506 | ||
1507 | while Present (Actual) loop | |
1508 | Analyze (Actual); | |
1509 | Check_Parameterless_Call (Actual); | |
1510 | Next (Actual); | |
1511 | end loop; | |
1512 | end if; | |
1513 | ||
0bfc9a64 | 1514 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1515 | |
1516 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a AC |
1517 | and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
1518 | Name_Elab_Body, | |
1519 | Name_Elab_Subp_Body) | |
996ae0b0 RK |
1520 | then |
1521 | if Present (Actuals) then | |
1522 | Error_Msg_N | |
1523 | ("no parameters allowed for this call", First (Actuals)); | |
1524 | return; | |
1525 | end if; | |
1526 | ||
1527 | Set_Etype (N, Standard_Void_Type); | |
1528 | Set_Analyzed (N); | |
1529 | ||
1530 | elsif Is_Entity_Name (P) | |
1531 | and then Is_Record_Type (Etype (Entity (P))) | |
1532 | and then Remote_AST_I_Dereference (P) | |
1533 | then | |
1534 | return; | |
1535 | ||
1536 | elsif Is_Entity_Name (P) | |
1537 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1538 | then | |
1539 | if Is_Access_Type (Etype (P)) | |
1540 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1541 | and then No (Actuals) | |
1542 | and then Comes_From_Source (N) | |
1543 | then | |
ed2233dc | 1544 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1545 | end if; |
1546 | ||
1547 | Analyze_Call_And_Resolve; | |
1548 | ||
1549 | -- If the prefix is the simple name of an entry family, this is | |
1550 | -- a parameterless call from within the task body itself. | |
1551 | ||
1552 | elsif Is_Entity_Name (P) | |
1553 | and then Nkind (P) = N_Identifier | |
1554 | and then Ekind (Entity (P)) = E_Entry_Family | |
1555 | and then Present (Actuals) | |
1556 | and then No (Next (First (Actuals))) | |
1557 | then | |
82c80734 RD |
1558 | -- Can be call to parameterless entry family. What appears to be the |
1559 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1560 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1561 | -- transformation. |
1562 | ||
1563 | New_N := | |
1564 | Make_Indexed_Component (Loc, | |
1565 | Prefix => | |
1566 | Make_Selected_Component (Loc, | |
1567 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1568 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1569 | Expressions => Actuals); | |
1570 | Set_Name (N, New_N); | |
1571 | Set_Etype (New_N, Standard_Void_Type); | |
1572 | Set_Parameter_Associations (N, No_List); | |
1573 | Analyze_Call_And_Resolve; | |
1574 | ||
1575 | elsif Nkind (P) = N_Explicit_Dereference then | |
1576 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1577 | Analyze_Call_And_Resolve; | |
1578 | else | |
1579 | Error_Msg_N ("expect access to procedure in call", P); | |
1580 | end if; | |
1581 | ||
82c80734 RD |
1582 | -- The name can be a selected component or an indexed component that |
1583 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1584 | -- has parameter associations. | |
996ae0b0 RK |
1585 | |
1586 | elsif Is_Access_Type (Etype (P)) | |
1587 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1588 | then | |
1589 | if Present (Actuals) then | |
1590 | Analyze_Call_And_Resolve; | |
1591 | else | |
ed2233dc | 1592 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1593 | end if; |
1594 | ||
82c80734 RD |
1595 | -- If not an access to subprogram, then the prefix must resolve to the |
1596 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1597 | |
82c80734 RD |
1598 | -- For the case of a simple entry call, P is a selected component where |
1599 | -- the prefix is the task and the selector name is the entry. A call to | |
1600 | -- a protected procedure will have the same syntax. If the protected | |
1601 | -- object contains overloaded operations, the entity may appear as a | |
1602 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1603 | |
1604 | elsif Nkind (P) = N_Selected_Component | |
8fde064e AC |
1605 | and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
1606 | E_Procedure, | |
1607 | E_Function) | |
996ae0b0 RK |
1608 | then |
1609 | Analyze_Call_And_Resolve; | |
1610 | ||
1611 | elsif Nkind (P) = N_Selected_Component | |
1612 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1613 | and then Present (Actuals) | |
1614 | and then No (Next (First (Actuals))) | |
1615 | then | |
82c80734 RD |
1616 | -- Can be call to parameterless entry family. What appears to be the |
1617 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1618 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1619 | -- transformation. |
1620 | ||
1621 | New_N := | |
1622 | Make_Indexed_Component (Loc, | |
1623 | Prefix => New_Copy (P), | |
1624 | Expressions => Actuals); | |
1625 | Set_Name (N, New_N); | |
1626 | Set_Etype (New_N, Standard_Void_Type); | |
1627 | Set_Parameter_Associations (N, No_List); | |
1628 | Analyze_Call_And_Resolve; | |
1629 | ||
1630 | -- For the case of a reference to an element of an entry family, P is | |
1631 | -- an indexed component whose prefix is a selected component (task and | |
1632 | -- entry family), and whose index is the entry family index. | |
1633 | ||
1634 | elsif Nkind (P) = N_Indexed_Component | |
1635 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1636 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1637 | then | |
1638 | Analyze_Call_And_Resolve; | |
1639 | ||
1640 | -- If the prefix is the name of an entry family, it is a call from | |
1641 | -- within the task body itself. | |
1642 | ||
1643 | elsif Nkind (P) = N_Indexed_Component | |
1644 | and then Nkind (Prefix (P)) = N_Identifier | |
1645 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1646 | then | |
1647 | New_N := | |
1648 | Make_Selected_Component (Loc, | |
1649 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1650 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1651 | Rewrite (Prefix (P), New_N); | |
1652 | Analyze (P); | |
1653 | Analyze_Call_And_Resolve; | |
1654 | ||
9f8d1e5c AC |
1655 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
1656 | -- procedure name, so the construct can only be a qualified expression. | |
1657 | ||
1658 | elsif Nkind (P) = N_Qualified_Expression | |
1659 | and then Ada_Version >= Ada_2012 | |
1660 | then | |
1661 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
1662 | Analyze (N); | |
1663 | ||
e895b435 | 1664 | -- Anything else is an error |
996ae0b0 RK |
1665 | |
1666 | else | |
758c442c | 1667 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 RK |
1668 | end if; |
1669 | end Analyze_Procedure_Call; | |
1670 | ||
b0186f71 AC |
1671 | ------------------------------ |
1672 | -- Analyze_Return_Statement -- | |
1673 | ------------------------------ | |
1674 | ||
1675 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1676 | ||
1677 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1678 | N_Extended_Return_Statement)); | |
1679 | ||
1680 | Returns_Object : constant Boolean := | |
1681 | Nkind (N) = N_Extended_Return_Statement | |
1682 | or else | |
8fde064e AC |
1683 | (Nkind (N) = N_Simple_Return_Statement |
1684 | and then Present (Expression (N))); | |
b0186f71 AC |
1685 | -- True if we're returning something; that is, "return <expression>;" |
1686 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1687 | -- checking: If Returns_Object is True, N should apply to a function | |
1688 | -- body; otherwise N should apply to a procedure body, entry body, | |
1689 | -- accept statement, or extended return statement. | |
1690 | ||
1691 | function Find_What_It_Applies_To return Entity_Id; | |
1692 | -- Find the entity representing the innermost enclosing body, accept | |
1693 | -- statement, or extended return statement. If the result is a callable | |
1694 | -- construct or extended return statement, then this will be the value | |
1695 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1696 | -- illegal. See RM-6.5(4/2). | |
1697 | ||
1698 | ----------------------------- | |
1699 | -- Find_What_It_Applies_To -- | |
1700 | ----------------------------- | |
1701 | ||
1702 | function Find_What_It_Applies_To return Entity_Id is | |
1703 | Result : Entity_Id := Empty; | |
1704 | ||
1705 | begin | |
36b8f95f AC |
1706 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1707 | -- and postconditions. | |
b0186f71 AC |
1708 | |
1709 | for J in reverse 0 .. Scope_Stack.Last loop | |
1710 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1711 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1712 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1713 | end loop; |
1714 | ||
1715 | pragma Assert (Present (Result)); | |
1716 | return Result; | |
1717 | end Find_What_It_Applies_To; | |
1718 | ||
1719 | -- Local declarations | |
1720 | ||
1721 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1722 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1723 | Loc : constant Source_Ptr := Sloc (N); | |
1724 | Stm_Entity : constant Entity_Id := | |
1725 | New_Internal_Entity | |
1726 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1727 | ||
1728 | -- Start of processing for Analyze_Return_Statement | |
1729 | ||
1730 | begin | |
1731 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1732 | ||
1733 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1734 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1735 | ||
1736 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1737 | -- (4/2): an inner return statement will apply to this extended return. | |
1738 | ||
1739 | if Nkind (N) = N_Extended_Return_Statement then | |
1740 | Push_Scope (Stm_Entity); | |
1741 | end if; | |
1742 | ||
1743 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1744 | -- implicitly-generated return that is placed at the end. | |
1745 | ||
1746 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1747 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1748 | end if; | |
1749 | ||
1750 | -- Warn on any unassigned OUT parameters if in procedure | |
1751 | ||
1752 | if Ekind (Scope_Id) = E_Procedure then | |
1753 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1754 | end if; | |
1755 | ||
1756 | -- Check that functions return objects, and other things do not | |
1757 | ||
1758 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1759 | if not Returns_Object then | |
1760 | Error_Msg_N ("missing expression in return from function", N); | |
1761 | end if; | |
1762 | ||
1763 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1764 | if Returns_Object then | |
1765 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1766 | end if; | |
1767 | ||
1768 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1769 | if Returns_Object then | |
1770 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1771 | Error_Msg_N ("entry body cannot return value", N); | |
1772 | else | |
1773 | Error_Msg_N ("accept statement cannot return value", N); | |
1774 | end if; | |
1775 | end if; | |
1776 | ||
1777 | elsif Kind = E_Return_Statement then | |
1778 | ||
1779 | -- We are nested within another return statement, which must be an | |
1780 | -- extended_return_statement. | |
1781 | ||
1782 | if Returns_Object then | |
d0dcb2b1 AC |
1783 | if Nkind (N) = N_Extended_Return_Statement then |
1784 | Error_Msg_N | |
cc96a1b8 | 1785 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
1786 | N); |
1787 | ||
1788 | -- Case of a simple return statement with a value inside extended | |
1789 | -- return statement. | |
1790 | ||
1791 | else | |
1792 | Error_Msg_N | |
1793 | ("return nested in extended return statement cannot return " & | |
cc96a1b8 | 1794 | "value (use `RETURN;`)", N); |
d0dcb2b1 | 1795 | end if; |
b0186f71 AC |
1796 | end if; |
1797 | ||
1798 | else | |
1799 | Error_Msg_N ("illegal context for return statement", N); | |
1800 | end if; | |
1801 | ||
1802 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1803 | Analyze_Function_Return (N); | |
1804 | ||
1805 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1806 | Set_Return_Present (Scope_Id); | |
1807 | end if; | |
1808 | ||
1809 | if Nkind (N) = N_Extended_Return_Statement then | |
1810 | End_Scope; | |
1811 | end if; | |
1812 | ||
1813 | Kill_Current_Values (Last_Assignment_Only => True); | |
1814 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
1815 | |
1816 | Analyze_Dimension (N); | |
b0186f71 AC |
1817 | end Analyze_Return_Statement; |
1818 | ||
5d37ba92 ES |
1819 | ------------------------------------- |
1820 | -- Analyze_Simple_Return_Statement -- | |
1821 | ------------------------------------- | |
ec4867fa | 1822 | |
5d37ba92 | 1823 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1824 | begin |
5d37ba92 ES |
1825 | if Present (Expression (N)) then |
1826 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1827 | end if; |
1828 | ||
5d37ba92 ES |
1829 | Analyze_Return_Statement (N); |
1830 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1831 | |
82c80734 RD |
1832 | ------------------------- |
1833 | -- Analyze_Return_Type -- | |
1834 | ------------------------- | |
1835 | ||
1836 | procedure Analyze_Return_Type (N : Node_Id) is | |
1837 | Designator : constant Entity_Id := Defining_Entity (N); | |
1838 | Typ : Entity_Id := Empty; | |
1839 | ||
1840 | begin | |
ec4867fa ES |
1841 | -- Normal case where result definition does not indicate an error |
1842 | ||
41251c60 JM |
1843 | if Result_Definition (N) /= Error then |
1844 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
2ba431e5 | 1845 | Check_SPARK_Restriction |
fe5d3068 | 1846 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1847 | |
b1c11e0e JM |
1848 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1849 | ||
1850 | declare | |
1851 | AD : constant Node_Id := | |
1852 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1853 | begin | |
1854 | if Present (AD) and then Protected_Present (AD) then | |
1855 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1856 | else | |
1857 | Typ := Access_Definition (N, Result_Definition (N)); | |
1858 | end if; | |
1859 | end; | |
1860 | ||
41251c60 JM |
1861 | Set_Parent (Typ, Result_Definition (N)); |
1862 | Set_Is_Local_Anonymous_Access (Typ); | |
1863 | Set_Etype (Designator, Typ); | |
1864 | ||
b66c3ff4 AC |
1865 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1866 | ||
1867 | Null_Exclusion_Static_Checks (N); | |
1868 | ||
41251c60 JM |
1869 | -- Subtype_Mark case |
1870 | ||
1871 | else | |
1872 | Find_Type (Result_Definition (N)); | |
1873 | Typ := Entity (Result_Definition (N)); | |
1874 | Set_Etype (Designator, Typ); | |
1875 | ||
2ba431e5 | 1876 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1877 | |
8fde064e | 1878 | if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
2ba431e5 | 1879 | Check_SPARK_Restriction |
fe5d3068 | 1880 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1881 | Result_Definition (N)); |
daec8eeb YM |
1882 | end if; |
1883 | ||
b66c3ff4 AC |
1884 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1885 | ||
1886 | Null_Exclusion_Static_Checks (N); | |
1887 | ||
1888 | -- If a null exclusion is imposed on the result type, then create | |
1889 | -- a null-excluding itype (an access subtype) and use it as the | |
1890 | -- function's Etype. Note that the null exclusion checks are done | |
1891 | -- right before this, because they don't get applied to types that | |
1892 | -- do not come from source. | |
1893 | ||
8fde064e | 1894 | if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
b66c3ff4 AC |
1895 | Set_Etype (Designator, |
1896 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
1897 | (T => Typ, |
1898 | Related_Nod => N, | |
1899 | Scope_Id => Scope (Current_Scope))); | |
1900 | ||
1901 | -- The new subtype must be elaborated before use because | |
1902 | -- it is visible outside of the function. However its base | |
1903 | -- type may not be frozen yet, so the reference that will | |
1904 | -- force elaboration must be attached to the freezing of | |
1905 | -- the base type. | |
1906 | ||
212863c0 AC |
1907 | -- If the return specification appears on a proper body, |
1908 | -- the subtype will have been created already on the spec. | |
1909 | ||
ff7139c3 | 1910 | if Is_Frozen (Typ) then |
212863c0 AC |
1911 | if Nkind (Parent (N)) = N_Subprogram_Body |
1912 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
1913 | then | |
1914 | null; | |
1915 | else | |
1916 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
1917 | end if; | |
1918 | ||
ff7139c3 AC |
1919 | else |
1920 | Ensure_Freeze_Node (Typ); | |
1921 | ||
1922 | declare | |
212863c0 | 1923 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
1924 | begin |
1925 | Set_Itype (IR, Etype (Designator)); | |
1926 | Append_Freeze_Actions (Typ, New_List (IR)); | |
1927 | end; | |
1928 | end if; | |
1929 | ||
b66c3ff4 AC |
1930 | else |
1931 | Set_Etype (Designator, Typ); | |
1932 | end if; | |
1933 | ||
41251c60 | 1934 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
1935 | and then Is_Value_Type (Typ) |
1936 | then | |
1937 | null; | |
1938 | ||
1939 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 | 1940 | or else (Is_Class_Wide_Type (Typ) |
8fde064e | 1941 | and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
41251c60 | 1942 | then |
dd386db0 AC |
1943 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
1944 | -- parts. Untagged incomplete types are not allowed in bodies. | |
1945 | ||
1946 | if Ada_Version >= Ada_2012 then | |
1947 | if Is_Tagged_Type (Typ) then | |
1948 | null; | |
1949 | ||
5b6f12c7 | 1950 | elsif Nkind (Parent (N)) = N_Subprogram_Body |
31d922e3 AC |
1951 | or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
1952 | N_Entry_Body) | |
dd386db0 AC |
1953 | then |
1954 | Error_Msg_NE | |
1955 | ("invalid use of untagged incomplete type&", | |
1956 | Designator, Typ); | |
1957 | end if; | |
1958 | ||
63be2a5a | 1959 | -- The type must be completed in the current package. This |
31d922e3 | 1960 | -- is checked at the end of the package declaration when |
7b7a0c2b AC |
1961 | -- Taft-amendment types are identified. If the return type |
1962 | -- is class-wide, there is no required check, the type can | |
1963 | -- be a bona fide TAT. | |
63be2a5a AC |
1964 | |
1965 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 1966 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 1967 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
1968 | then |
1969 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
1970 | end if; | |
1971 | ||
dd386db0 AC |
1972 | else |
1973 | Error_Msg_NE | |
1974 | ("invalid use of incomplete type&", Designator, Typ); | |
1975 | end if; | |
41251c60 | 1976 | end if; |
82c80734 RD |
1977 | end if; |
1978 | ||
ec4867fa ES |
1979 | -- Case where result definition does indicate an error |
1980 | ||
82c80734 RD |
1981 | else |
1982 | Set_Etype (Designator, Any_Type); | |
1983 | end if; | |
1984 | end Analyze_Return_Type; | |
1985 | ||
996ae0b0 RK |
1986 | ----------------------------- |
1987 | -- Analyze_Subprogram_Body -- | |
1988 | ----------------------------- | |
1989 | ||
b1b543d2 BD |
1990 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
1991 | Loc : constant Source_Ptr := Sloc (N); | |
1992 | Body_Spec : constant Node_Id := Specification (N); | |
1993 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
1994 | ||
1995 | begin | |
1996 | if Debug_Flag_C then | |
1997 | Write_Str ("==> subprogram body "); | |
1998 | Write_Name (Chars (Body_Id)); | |
1999 | Write_Str (" from "); | |
2000 | Write_Location (Loc); | |
2001 | Write_Eol; | |
2002 | Indent; | |
2003 | end if; | |
2004 | ||
2005 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
2006 | ||
2007 | -- The real work is split out into the helper, so it can do "return;" | |
2008 | -- without skipping the debug output: | |
2009 | ||
2010 | Analyze_Subprogram_Body_Helper (N); | |
2011 | ||
2012 | if Debug_Flag_C then | |
2013 | Outdent; | |
2014 | Write_Str ("<== subprogram body "); | |
2015 | Write_Name (Chars (Body_Id)); | |
2016 | Write_Str (" from "); | |
2017 | Write_Location (Loc); | |
2018 | Write_Eol; | |
2019 | end if; | |
2020 | end Analyze_Subprogram_Body; | |
2021 | ||
ea3c0651 AC |
2022 | -------------------------------------- |
2023 | -- Analyze_Subprogram_Body_Contract -- | |
2024 | -------------------------------------- | |
2025 | ||
ab8843fa | 2026 | procedure Analyze_Subprogram_Body_Contract (Body_Id : Entity_Id) is |
54e28df2 HK |
2027 | Body_Decl : constant Node_Id := Parent (Parent (Body_Id)); |
2028 | Spec_Id : constant Entity_Id := Corresponding_Spec (Body_Decl); | |
2029 | Prag : Node_Id; | |
2030 | Ref_Depends : Node_Id := Empty; | |
2031 | Ref_Global : Node_Id := Empty; | |
ea3c0651 | 2032 | |
ea3c0651 | 2033 | begin |
ab8843fa HK |
2034 | -- When a subprogram body declaration is erroneous, its defining entity |
2035 | -- is left unanalyzed. There is nothing left to do in this case because | |
2036 | -- the body lacks a contract. | |
2037 | ||
2038 | if not Analyzed (Body_Id) then | |
2039 | return; | |
2040 | end if; | |
2041 | ||
54e28df2 HK |
2042 | -- Locate and store pragmas Refined_Depends and Refined_Global since |
2043 | -- their order of analysis matters. | |
2044 | ||
ab8843fa HK |
2045 | Prag := Classifications (Contract (Body_Id)); |
2046 | while Present (Prag) loop | |
2047 | if Pragma_Name (Prag) = Name_Refined_Depends then | |
54e28df2 | 2048 | Ref_Depends := Prag; |
ab8843fa | 2049 | elsif Pragma_Name (Prag) = Name_Refined_Global then |
54e28df2 | 2050 | Ref_Global := Prag; |
ab8843fa HK |
2051 | end if; |
2052 | ||
2053 | Prag := Next_Pragma (Prag); | |
2054 | end loop; | |
2055 | ||
54e28df2 HK |
2056 | -- Analyze Refined_Global first as Refined_Depends may mention items |
2057 | -- classified in the global refinement. | |
2058 | ||
2059 | if Present (Ref_Global) then | |
2060 | Analyze_Refined_Global_In_Decl_Part (Ref_Global); | |
2061 | ||
ab8843fa HK |
2062 | -- When the corresponding Global aspect/pragma references a state with |
2063 | -- visible refinement, the body requires Refined_Global. | |
2064 | ||
54e28df2 | 2065 | elsif Present (Spec_Id) then |
ab8843fa HK |
2066 | Prag := Get_Pragma (Spec_Id, Pragma_Global); |
2067 | ||
2068 | if Present (Prag) and then Contains_Refined_State (Prag) then | |
2069 | Error_Msg_NE | |
2070 | ("body of subprogram & requires global refinement", | |
2071 | Body_Decl, Spec_Id); | |
2072 | end if; | |
2073 | end if; | |
54e28df2 HK |
2074 | |
2075 | -- Refined_Depends must be analyzed after Refined_Global in order to see | |
2076 | -- the modes of all global refinements. | |
2077 | ||
2078 | if Present (Ref_Depends) then | |
2079 | Analyze_Refined_Depends_In_Decl_Part (Ref_Depends); | |
39d3009f AC |
2080 | |
2081 | -- When the corresponding Depends aspect/pragma references a state with | |
2082 | -- visible refinement, the body requires Refined_Depends. | |
2083 | ||
2084 | elsif Present (Spec_Id) then | |
2085 | Prag := Get_Pragma (Spec_Id, Pragma_Depends); | |
2086 | ||
2087 | if Present (Prag) and then Contains_Refined_State (Prag) then | |
2088 | Error_Msg_NE | |
2089 | ("body of subprogram & requires dependance refinement", | |
2090 | Body_Decl, Spec_Id); | |
2091 | end if; | |
54e28df2 | 2092 | end if; |
ea3c0651 AC |
2093 | end Analyze_Subprogram_Body_Contract; |
2094 | ||
b1b543d2 BD |
2095 | ------------------------------------ |
2096 | -- Analyze_Subprogram_Body_Helper -- | |
2097 | ------------------------------------ | |
2098 | ||
996ae0b0 RK |
2099 | -- This procedure is called for regular subprogram bodies, generic bodies, |
2100 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
2101 | -- specification matters, and is used to create a proper declaration for | |
2102 | -- the subprogram, or to perform conformance checks. | |
2103 | ||
b1b543d2 | 2104 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b AC |
2105 | Loc : constant Source_Ptr := Sloc (N); |
2106 | Body_Spec : constant Node_Id := Specification (N); | |
2107 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
2108 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 2109 | Conformant : Boolean; |
21d27997 | 2110 | HSS : Node_Id; |
21d27997 RD |
2111 | Prot_Typ : Entity_Id := Empty; |
2112 | Spec_Id : Entity_Id; | |
2113 | Spec_Decl : Node_Id := Empty; | |
2114 | ||
2115 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
2116 | -- When we analyze a separate spec, the entity chain ends up containing | |
2117 | -- the formals, as well as any itypes generated during analysis of the | |
2118 | -- default expressions for parameters, or the arguments of associated | |
2119 | -- precondition/postcondition pragmas (which are analyzed in the context | |
2120 | -- of the spec since they have visibility on formals). | |
2121 | -- | |
2122 | -- These entities belong with the spec and not the body. However we do | |
2123 | -- the analysis of the body in the context of the spec (again to obtain | |
2124 | -- visibility to the formals), and all the entities generated during | |
2125 | -- this analysis end up also chained to the entity chain of the spec. | |
2126 | -- But they really belong to the body, and there is circuitry to move | |
2127 | -- them from the spec to the body. | |
2128 | -- | |
2129 | -- However, when we do this move, we don't want to move the real spec | |
2130 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
2131 | -- variable points to the last real spec entity, so we only move those | |
2132 | -- chained beyond that point. It is initialized to Empty to deal with | |
2133 | -- the case where there is no separate spec. | |
996ae0b0 | 2134 | |
ec4867fa | 2135 | procedure Check_Anonymous_Return; |
e50e1c5e | 2136 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
2137 | -- or a type that contains tasks, we must create a master entity for |
2138 | -- the anonymous type, which typically will be used in an allocator | |
2139 | -- in the body of the function. | |
2140 | ||
e660dbf7 JM |
2141 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
2142 | -- Look ahead to recognize a pragma that may appear after the body. | |
2143 | -- If there is a previous spec, check that it appears in the same | |
2144 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
2145 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
2146 | -- If the body acts as a spec, and inlining is required, we create a | |
2147 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
2148 | -- If pragma does not appear after the body, check whether there is |
2149 | -- an inline pragma before any local declarations. | |
c37bb106 | 2150 | |
7665e4bd AC |
2151 | procedure Check_Missing_Return; |
2152 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
2153 | -- the warning checks implemented by Check_Returns. In formal mode, also |
2154 | -- verify that a function ends with a RETURN and that a procedure does | |
2155 | -- not contain any RETURN. | |
7665e4bd | 2156 | |
b4f149c2 AC |
2157 | procedure Diagnose_Misplaced_Aspect_Specifications; |
2158 | -- It is known that subprogram body N has aspects, but they are not | |
2159 | -- properly placed. Provide specific error messages depending on the | |
2160 | -- aspects involved. | |
2161 | ||
d44202ba HK |
2162 | function Disambiguate_Spec return Entity_Id; |
2163 | -- When a primitive is declared between the private view and the full | |
2164 | -- view of a concurrent type which implements an interface, a special | |
2165 | -- mechanism is used to find the corresponding spec of the primitive | |
2166 | -- body. | |
2167 | ||
5dcab3ca AC |
2168 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id); |
2169 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains | |
2170 | -- incomplete types coming from a limited context and swap their limited | |
2171 | -- views with the non-limited ones. | |
2172 | ||
d44202ba HK |
2173 | function Is_Private_Concurrent_Primitive |
2174 | (Subp_Id : Entity_Id) return Boolean; | |
2175 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
2176 | -- type that implements an interface and has a private view. | |
2177 | ||
76a69663 ES |
2178 | procedure Set_Trivial_Subprogram (N : Node_Id); |
2179 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
2180 | -- subprogram whose body is being analyzed. N is the statement node | |
2181 | -- causing the flag to be set, if the following statement is a return | |
2182 | -- of an entity, we mark the entity as set in source to suppress any | |
2183 | -- warning on the stylized use of function stubs with a dummy return. | |
2184 | ||
758c442c GD |
2185 | procedure Verify_Overriding_Indicator; |
2186 | -- If there was a previous spec, the entity has been entered in the | |
2187 | -- current scope previously. If the body itself carries an overriding | |
2188 | -- indicator, check that it is consistent with the known status of the | |
2189 | -- entity. | |
2190 | ||
ec4867fa ES |
2191 | ---------------------------- |
2192 | -- Check_Anonymous_Return -- | |
2193 | ---------------------------- | |
2194 | ||
2195 | procedure Check_Anonymous_Return is | |
2196 | Decl : Node_Id; | |
a523b302 | 2197 | Par : Node_Id; |
ec4867fa ES |
2198 | Scop : Entity_Id; |
2199 | ||
2200 | begin | |
2201 | if Present (Spec_Id) then | |
2202 | Scop := Spec_Id; | |
2203 | else | |
2204 | Scop := Body_Id; | |
2205 | end if; | |
2206 | ||
2207 | if Ekind (Scop) = E_Function | |
2208 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 JM |
2209 | and then not Is_Thunk (Scop) |
2210 | and then (Has_Task (Designated_Type (Etype (Scop))) | |
2211 | or else | |
2212 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) | |
2213 | and then | |
2214 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 2215 | and then Expander_Active |
b20de9b9 | 2216 | |
8fde064e | 2217 | -- Avoid cases with no tasking support |
b20de9b9 AC |
2218 | |
2219 | and then RTE_Available (RE_Current_Master) | |
2220 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
2221 | then |
2222 | Decl := | |
2223 | Make_Object_Declaration (Loc, | |
2224 | Defining_Identifier => | |
2225 | Make_Defining_Identifier (Loc, Name_uMaster), | |
2226 | Constant_Present => True, | |
2227 | Object_Definition => | |
e4494292 | 2228 | New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
ec4867fa ES |
2229 | Expression => |
2230 | Make_Explicit_Dereference (Loc, | |
e4494292 | 2231 | New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
ec4867fa ES |
2232 | |
2233 | if Present (Declarations (N)) then | |
2234 | Prepend (Decl, Declarations (N)); | |
2235 | else | |
2236 | Set_Declarations (N, New_List (Decl)); | |
2237 | end if; | |
2238 | ||
2239 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
2240 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
2241 | |
2242 | -- Now mark the containing scope as a task master | |
2243 | ||
2244 | Par := N; | |
2245 | while Nkind (Par) /= N_Compilation_Unit loop | |
2246 | Par := Parent (Par); | |
2247 | pragma Assert (Present (Par)); | |
2248 | ||
2249 | -- If we fall off the top, we are at the outer level, and | |
2250 | -- the environment task is our effective master, so nothing | |
2251 | -- to mark. | |
2252 | ||
2253 | if Nkind_In | |
2254 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
2255 | then | |
2256 | Set_Is_Task_Master (Par, True); | |
2257 | exit; | |
2258 | end if; | |
2259 | end loop; | |
ec4867fa ES |
2260 | end if; |
2261 | end Check_Anonymous_Return; | |
2262 | ||
e660dbf7 JM |
2263 | ------------------------- |
2264 | -- Check_Inline_Pragma -- | |
2265 | ------------------------- | |
758c442c | 2266 | |
e660dbf7 JM |
2267 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
2268 | Prag : Node_Id; | |
2269 | Plist : List_Id; | |
0fb2ea01 | 2270 | |
21d27997 | 2271 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 2272 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 2273 | -- to this subprogram. |
21d27997 RD |
2274 | |
2275 | ----------------------- | |
2276 | -- Is_Inline_Pragma -- | |
2277 | ----------------------- | |
2278 | ||
2279 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
2280 | begin | |
2281 | return | |
2282 | Nkind (N) = N_Pragma | |
2283 | and then | |
8fde064e AC |
2284 | (Pragma_Name (N) = Name_Inline_Always |
2285 | or else | |
21d27997 RD |
2286 | (Front_End_Inlining |
2287 | and then Pragma_Name (N) = Name_Inline)) | |
2288 | and then | |
8fde064e AC |
2289 | Chars |
2290 | (Expression (First (Pragma_Argument_Associations (N)))) = | |
2291 | Chars (Body_Id); | |
21d27997 RD |
2292 | end Is_Inline_Pragma; |
2293 | ||
2294 | -- Start of processing for Check_Inline_Pragma | |
2295 | ||
c37bb106 | 2296 | begin |
e660dbf7 JM |
2297 | if not Expander_Active then |
2298 | return; | |
2299 | end if; | |
2300 | ||
2301 | if Is_List_Member (N) | |
2302 | and then Present (Next (N)) | |
21d27997 | 2303 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2304 | then |
2305 | Prag := Next (N); | |
2306 | ||
21d27997 RD |
2307 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2308 | and then Present (Declarations (N)) | |
2309 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2310 | then | |
2311 | Prag := First (Declarations (N)); | |
2312 | ||
e660dbf7 JM |
2313 | else |
2314 | Prag := Empty; | |
c37bb106 | 2315 | end if; |
e660dbf7 JM |
2316 | |
2317 | if Present (Prag) then | |
2318 | if Present (Spec_Id) then | |
30196a76 | 2319 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
2320 | Analyze (Prag); |
2321 | end if; | |
2322 | ||
2323 | else | |
d39d6bb8 | 2324 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
2325 | |
2326 | declare | |
2327 | Subp : constant Entity_Id := | |
30196a76 | 2328 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 2329 | Decl : constant Node_Id := |
30196a76 RD |
2330 | Make_Subprogram_Declaration (Loc, |
2331 | Specification => | |
2332 | New_Copy_Tree (Specification (N))); | |
2333 | ||
e660dbf7 JM |
2334 | begin |
2335 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
2336 | ||
2337 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 2338 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2339 | Set_Parameter_Specifications |
2340 | (Specification (Decl), Plist); | |
2341 | end if; | |
2342 | ||
2343 | Insert_Before (N, Decl); | |
2344 | Analyze (Decl); | |
2345 | Analyze (Prag); | |
2346 | Set_Has_Pragma_Inline (Subp); | |
2347 | ||
76a69663 | 2348 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2349 | Set_Is_Inlined (Subp); |
21d27997 | 2350 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2351 | end if; |
2352 | ||
2353 | Spec := Subp; | |
2354 | end; | |
2355 | end if; | |
2356 | end if; | |
2357 | end Check_Inline_Pragma; | |
2358 | ||
7665e4bd AC |
2359 | -------------------------- |
2360 | -- Check_Missing_Return -- | |
2361 | -------------------------- | |
2362 | ||
2363 | procedure Check_Missing_Return is | |
2364 | Id : Entity_Id; | |
2365 | Missing_Ret : Boolean; | |
2366 | ||
2367 | begin | |
2368 | if Nkind (Body_Spec) = N_Function_Specification then | |
2369 | if Present (Spec_Id) then | |
2370 | Id := Spec_Id; | |
2371 | else | |
2372 | Id := Body_Id; | |
2373 | end if; | |
2374 | ||
fe5d3068 | 2375 | if Return_Present (Id) then |
7665e4bd AC |
2376 | Check_Returns (HSS, 'F', Missing_Ret); |
2377 | ||
2378 | if Missing_Ret then | |
2379 | Set_Has_Missing_Return (Id); | |
2380 | end if; | |
2381 | ||
2aca76d6 AC |
2382 | elsif Is_Generic_Subprogram (Id) |
2383 | or else not Is_Machine_Code_Subprogram (Id) | |
7665e4bd AC |
2384 | then |
2385 | Error_Msg_N ("missing RETURN statement in function body", N); | |
2386 | end if; | |
2387 | ||
fe5d3068 | 2388 | -- If procedure with No_Return, check returns |
607d0635 | 2389 | |
fe5d3068 YM |
2390 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
2391 | and then Present (Spec_Id) | |
2392 | and then No_Return (Spec_Id) | |
607d0635 | 2393 | then |
fe5d3068 YM |
2394 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
2395 | end if; | |
2396 | ||
ad05f2e9 | 2397 | -- Special checks in SPARK mode |
fe5d3068 YM |
2398 | |
2399 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 2400 | |
ad05f2e9 | 2401 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
2402 | |
2403 | declare | |
2404 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
2405 | begin | |
2406 | if Present (Stat) | |
7394c8cc AC |
2407 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
2408 | N_Extended_Return_Statement) | |
fe5d3068 | 2409 | then |
2ba431e5 | 2410 | Check_SPARK_Restriction |
fe5d3068 YM |
2411 | ("last statement in function should be RETURN", Stat); |
2412 | end if; | |
2413 | end; | |
2414 | ||
ad05f2e9 | 2415 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
2416 | |
2417 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
2418 | if Present (Spec_Id) then |
2419 | Id := Spec_Id; | |
2420 | else | |
2421 | Id := Body_Id; | |
2422 | end if; | |
2423 | ||
8d606a78 RD |
2424 | -- Would be nice to point to return statement here, can we |
2425 | -- borrow the Check_Returns procedure here ??? | |
2426 | ||
607d0635 | 2427 | if Return_Present (Id) then |
2ba431e5 | 2428 | Check_SPARK_Restriction |
fe5d3068 | 2429 | ("procedure should not have RETURN", N); |
607d0635 | 2430 | end if; |
7665e4bd AC |
2431 | end if; |
2432 | end Check_Missing_Return; | |
2433 | ||
b4f149c2 AC |
2434 | ---------------------------------------------- |
2435 | -- Diagnose_Misplaced_Aspect_Specifications -- | |
2436 | ---------------------------------------------- | |
2437 | ||
2438 | procedure Diagnose_Misplaced_Aspect_Specifications is | |
2439 | Asp : Node_Id; | |
2440 | Asp_Nam : Name_Id; | |
2441 | Asp_Id : Aspect_Id; | |
2442 | -- The current aspect along with its name and id | |
2443 | ||
2444 | procedure SPARK_Aspect_Error (Ref_Nam : Name_Id); | |
2445 | -- Emit an error message concerning SPARK aspect Asp. Ref_Nam is the | |
2446 | -- name of the refined version of the aspect. | |
2447 | ||
2448 | ------------------------ | |
2449 | -- SPARK_Aspect_Error -- | |
2450 | ------------------------ | |
2451 | ||
2452 | procedure SPARK_Aspect_Error (Ref_Nam : Name_Id) is | |
2453 | begin | |
2454 | -- The corresponding spec already contains the aspect in question | |
2455 | -- and the one appearing on the body must be the refined form: | |
2456 | ||
2457 | -- procedure P with Global ...; | |
2458 | -- procedure P with Global ... is ... end P; | |
2459 | -- ^ | |
2460 | -- Refined_Global | |
2461 | ||
2462 | if Has_Aspect (Spec_Id, Asp_Id) then | |
2463 | Error_Msg_Name_1 := Asp_Nam; | |
2464 | Error_Msg_Name_2 := Ref_Nam; | |
2465 | Error_Msg_N ("aspect % should be %", Asp); | |
2466 | ||
2467 | -- Otherwise the aspect must appear in the spec, not in the body: | |
2468 | ||
2469 | -- procedure P; | |
2470 | -- procedure P with Global ... is ... end P; | |
2471 | ||
2472 | else | |
2473 | Error_Msg_N | |
2474 | ("aspect specification must appear in subprogram declaration", | |
2475 | Asp); | |
2476 | end if; | |
2477 | end SPARK_Aspect_Error; | |
2478 | ||
2479 | -- Start of processing for Diagnose_Misplaced_Aspect_Specifications | |
2480 | ||
2481 | begin | |
2482 | -- Iterate over the aspect specifications and emit specific errors | |
2483 | -- where applicable. | |
2484 | ||
2485 | Asp := First (Aspect_Specifications (N)); | |
2486 | while Present (Asp) loop | |
2487 | Asp_Nam := Chars (Identifier (Asp)); | |
2488 | Asp_Id := Get_Aspect_Id (Asp_Nam); | |
2489 | ||
2490 | -- Do not emit errors on aspects that can appear on a subprogram | |
2491 | -- body. This scenario occurs when the aspect specification list | |
2492 | -- contains both misplaced and properly placed aspects. | |
2493 | ||
2494 | if Aspect_On_Body_Or_Stub_OK (Asp_Id) then | |
2495 | null; | |
2496 | ||
2497 | -- Special diagnostics for SPARK aspects | |
2498 | ||
2499 | elsif Asp_Nam = Name_Depends then | |
2500 | SPARK_Aspect_Error (Name_Refined_Depends); | |
2501 | ||
2502 | elsif Asp_Nam = Name_Global then | |
2503 | SPARK_Aspect_Error (Name_Refined_Global); | |
2504 | ||
2505 | elsif Asp_Nam = Name_Post then | |
2506 | SPARK_Aspect_Error (Name_Refined_Post); | |
2507 | ||
2508 | else | |
2509 | Error_Msg_N | |
2510 | ("aspect specification must appear in subprogram declaration", | |
2511 | Asp); | |
2512 | end if; | |
2513 | ||
2514 | Next (Asp); | |
2515 | end loop; | |
2516 | end Diagnose_Misplaced_Aspect_Specifications; | |
2517 | ||
d44202ba HK |
2518 | ----------------------- |
2519 | -- Disambiguate_Spec -- | |
2520 | ----------------------- | |
2521 | ||
2522 | function Disambiguate_Spec return Entity_Id is | |
2523 | Priv_Spec : Entity_Id; | |
2524 | Spec_N : Entity_Id; | |
2525 | ||
2526 | procedure Replace_Types (To_Corresponding : Boolean); | |
2527 | -- Depending on the flag, replace the type of formal parameters of | |
2528 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2529 | -- the corresponding record type or the other way around. | |
2530 | ||
2531 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2532 | Formal : Entity_Id; | |
2533 | Formal_Typ : Entity_Id; | |
2534 | ||
2535 | begin | |
2536 | Formal := First_Formal (Body_Id); | |
2537 | while Present (Formal) loop | |
2538 | Formal_Typ := Etype (Formal); | |
2539 | ||
df3e68b1 HK |
2540 | if Is_Class_Wide_Type (Formal_Typ) then |
2541 | Formal_Typ := Root_Type (Formal_Typ); | |
2542 | end if; | |
2543 | ||
d44202ba HK |
2544 | -- From concurrent type to corresponding record |
2545 | ||
2546 | if To_Corresponding then | |
2547 | if Is_Concurrent_Type (Formal_Typ) | |
2548 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
2549 | and then Present (Interfaces ( | |
2550 | Corresponding_Record_Type (Formal_Typ))) | |
2551 | then | |
2552 | Set_Etype (Formal, | |
2553 | Corresponding_Record_Type (Formal_Typ)); | |
2554 | end if; | |
2555 | ||
2556 | -- From corresponding record to concurrent type | |
2557 | ||
2558 | else | |
2559 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2560 | and then Present (Interfaces (Formal_Typ)) | |
2561 | then | |
2562 | Set_Etype (Formal, | |
2563 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2564 | end if; | |
2565 | end if; | |
2566 | ||
2567 | Next_Formal (Formal); | |
2568 | end loop; | |
2569 | end Replace_Types; | |
2570 | ||
2571 | -- Start of processing for Disambiguate_Spec | |
2572 | ||
2573 | begin | |
2574 | -- Try to retrieve the specification of the body as is. All error | |
2575 | -- messages are suppressed because the body may not have a spec in | |
2576 | -- its current state. | |
2577 | ||
2578 | Spec_N := Find_Corresponding_Spec (N, False); | |
2579 | ||
2580 | -- It is possible that this is the body of a primitive declared | |
2581 | -- between a private and a full view of a concurrent type. The | |
2582 | -- controlling parameter of the spec carries the concurrent type, | |
2583 | -- not the corresponding record type as transformed by Analyze_ | |
2584 | -- Subprogram_Specification. In such cases, we undo the change | |
2585 | -- made by the analysis of the specification and try to find the | |
2586 | -- spec again. | |
766d7add | 2587 | |
8198b93d HK |
2588 | -- Note that wrappers already have their corresponding specs and |
2589 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2590 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2591 | -- original concurrent status. |
d44202ba | 2592 | |
8198b93d HK |
2593 | if No (Spec_N) |
2594 | or else Is_Primitive_Wrapper (Spec_N) | |
2595 | then | |
d44202ba HK |
2596 | -- Restore all references of corresponding record types to the |
2597 | -- original concurrent types. | |
2598 | ||
2599 | Replace_Types (To_Corresponding => False); | |
2600 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2601 | ||
2602 | -- The current body truly belongs to a primitive declared between | |
2603 | -- a private and a full view. We leave the modified body as is, | |
2604 | -- and return the true spec. | |
2605 | ||
2606 | if Present (Priv_Spec) | |
2607 | and then Is_Private_Primitive (Priv_Spec) | |
2608 | then | |
2609 | return Priv_Spec; | |
2610 | end if; | |
2611 | ||
2612 | -- In case that this is some sort of error, restore the original | |
2613 | -- state of the body. | |
2614 | ||
2615 | Replace_Types (To_Corresponding => True); | |
2616 | end if; | |
2617 | ||
2618 | return Spec_N; | |
2619 | end Disambiguate_Spec; | |
2620 | ||
5dcab3ca AC |
2621 | ---------------------------- |
2622 | -- Exchange_Limited_Views -- | |
2623 | ---------------------------- | |
2624 | ||
2625 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id) is | |
2626 | procedure Detect_And_Exchange (Id : Entity_Id); | |
2627 | -- Determine whether Id's type denotes an incomplete type associated | |
2628 | -- with a limited with clause and exchange the limited view with the | |
2629 | -- non-limited one. | |
2630 | ||
2631 | ------------------------- | |
2632 | -- Detect_And_Exchange -- | |
2633 | ------------------------- | |
2634 | ||
2635 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
2636 | Typ : constant Entity_Id := Etype (Id); | |
2637 | ||
2638 | begin | |
2639 | if Ekind (Typ) = E_Incomplete_Type | |
7b56a91b | 2640 | and then From_Limited_With (Typ) |
5dcab3ca AC |
2641 | and then Present (Non_Limited_View (Typ)) |
2642 | then | |
2643 | Set_Etype (Id, Non_Limited_View (Typ)); | |
2644 | end if; | |
2645 | end Detect_And_Exchange; | |
2646 | ||
2647 | -- Local variables | |
2648 | ||
2649 | Formal : Entity_Id; | |
2650 | ||
2651 | -- Start of processing for Exchange_Limited_Views | |
2652 | ||
2653 | begin | |
2654 | if No (Subp_Id) then | |
2655 | return; | |
2656 | ||
2657 | -- Do not process subprogram bodies as they already use the non- | |
2658 | -- limited view of types. | |
2659 | ||
2660 | elsif not Ekind_In (Subp_Id, E_Function, E_Procedure) then | |
2661 | return; | |
2662 | end if; | |
2663 | ||
2664 | -- Examine all formals and swap views when applicable | |
2665 | ||
2666 | Formal := First_Formal (Subp_Id); | |
2667 | while Present (Formal) loop | |
2668 | Detect_And_Exchange (Formal); | |
2669 | ||
2670 | Next_Formal (Formal); | |
2671 | end loop; | |
2672 | ||
2673 | -- Process the return type of a function | |
2674 | ||
2675 | if Ekind (Subp_Id) = E_Function then | |
2676 | Detect_And_Exchange (Subp_Id); | |
2677 | end if; | |
2678 | end Exchange_Limited_Views; | |
2679 | ||
d44202ba HK |
2680 | ------------------------------------- |
2681 | -- Is_Private_Concurrent_Primitive -- | |
2682 | ------------------------------------- | |
2683 | ||
2684 | function Is_Private_Concurrent_Primitive | |
2685 | (Subp_Id : Entity_Id) return Boolean | |
2686 | is | |
2687 | Formal_Typ : Entity_Id; | |
2688 | ||
2689 | begin | |
2690 | if Present (First_Formal (Subp_Id)) then | |
2691 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2692 | ||
2693 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2694 | if Is_Class_Wide_Type (Formal_Typ) then |
2695 | Formal_Typ := Root_Type (Formal_Typ); | |
2696 | end if; | |
2697 | ||
d44202ba HK |
2698 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2699 | end if; | |
2700 | ||
2701 | -- The type of the first formal is a concurrent tagged type with | |
2702 | -- a private view. | |
2703 | ||
2704 | return | |
2705 | Is_Concurrent_Type (Formal_Typ) | |
2706 | and then Is_Tagged_Type (Formal_Typ) | |
2707 | and then Has_Private_Declaration (Formal_Typ); | |
2708 | end if; | |
2709 | ||
2710 | return False; | |
2711 | end Is_Private_Concurrent_Primitive; | |
2712 | ||
76a69663 ES |
2713 | ---------------------------- |
2714 | -- Set_Trivial_Subprogram -- | |
2715 | ---------------------------- | |
2716 | ||
2717 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2718 | Nxt : constant Node_Id := Next (N); | |
2719 | ||
2720 | begin | |
2721 | Set_Is_Trivial_Subprogram (Body_Id); | |
2722 | ||
2723 | if Present (Spec_Id) then | |
2724 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2725 | end if; | |
2726 | ||
2727 | if Present (Nxt) | |
2728 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2729 | and then No (Next (Nxt)) | |
2730 | and then Present (Expression (Nxt)) | |
2731 | and then Is_Entity_Name (Expression (Nxt)) | |
2732 | then | |
2733 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2734 | end if; | |
2735 | end Set_Trivial_Subprogram; | |
2736 | ||
758c442c GD |
2737 | --------------------------------- |
2738 | -- Verify_Overriding_Indicator -- | |
2739 | --------------------------------- | |
2740 | ||
2741 | procedure Verify_Overriding_Indicator is | |
2742 | begin | |
21d27997 RD |
2743 | if Must_Override (Body_Spec) then |
2744 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
2745 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2746 | then | |
2747 | null; | |
2748 | ||
038140ed | 2749 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2750 | Error_Msg_NE |
21d27997 RD |
2751 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
2752 | end if; | |
758c442c | 2753 | |
5d37ba92 | 2754 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2755 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2756 | Error_Msg_NE |
5d37ba92 | 2757 | ("subprogram& overrides inherited operation", |
76a69663 | 2758 | Body_Spec, Spec_Id); |
5d37ba92 | 2759 | |
21d27997 RD |
2760 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
2761 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2762 | then | |
ed2233dc | 2763 | Error_Msg_NE |
21d27997 RD |
2764 | ("subprogram & overrides predefined operator ", |
2765 | Body_Spec, Spec_Id); | |
2766 | ||
618fb570 AC |
2767 | -- If this is not a primitive operation or protected subprogram, |
2768 | -- then the overriding indicator is altogether illegal. | |
5d37ba92 | 2769 | |
618fb570 AC |
2770 | elsif not Is_Primitive (Spec_Id) |
2771 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type | |
2772 | then | |
ed2233dc | 2773 | Error_Msg_N |
19d846a0 RD |
2774 | ("overriding indicator only allowed " & |
2775 | "if subprogram is primitive", | |
2776 | Body_Spec); | |
5d37ba92 | 2777 | end if; |
235f4375 | 2778 | |
806f6d37 | 2779 | elsif Style_Check |
038140ed | 2780 | and then Present (Overridden_Operation (Spec_Id)) |
235f4375 AC |
2781 | then |
2782 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2783 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
2784 | |
2785 | elsif Style_Check | |
2786 | and then Can_Override_Operator (Spec_Id) | |
2787 | and then not Is_Predefined_File_Name | |
2788 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
2789 | then | |
2790 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2791 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
2792 | end if; |
2793 | end Verify_Overriding_Indicator; | |
2794 | ||
b1b543d2 | 2795 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 2796 | |
996ae0b0 | 2797 | begin |
82c80734 RD |
2798 | -- Generic subprograms are handled separately. They always have a |
2799 | -- generic specification. Determine whether current scope has a | |
2800 | -- previous declaration. | |
996ae0b0 | 2801 | |
82c80734 RD |
2802 | -- If the subprogram body is defined within an instance of the same |
2803 | -- name, the instance appears as a package renaming, and will be hidden | |
2804 | -- within the subprogram. | |
996ae0b0 RK |
2805 | |
2806 | if Present (Prev_Id) | |
2807 | and then not Is_Overloadable (Prev_Id) | |
2808 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
2809 | or else Comes_From_Source (Prev_Id)) | |
2810 | then | |
fbf5a39b | 2811 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 RK |
2812 | Spec_Id := Prev_Id; |
2813 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2814 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2815 | ||
2816 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
2817 | |
2818 | if Nkind (N) = N_Subprogram_Body then | |
2819 | HSS := Handled_Statement_Sequence (N); | |
2820 | Check_Missing_Return; | |
2821 | end if; | |
2822 | ||
996ae0b0 RK |
2823 | return; |
2824 | ||
2825 | else | |
82c80734 RD |
2826 | -- Previous entity conflicts with subprogram name. Attempting to |
2827 | -- enter name will post error. | |
996ae0b0 RK |
2828 | |
2829 | Enter_Name (Body_Id); | |
2830 | return; | |
2831 | end if; | |
2832 | ||
82c80734 RD |
2833 | -- Non-generic case, find the subprogram declaration, if one was seen, |
2834 | -- or enter new overloaded entity in the current scope. If the | |
2835 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
2836 | -- part of the context of one of its subunits. No need to redo the | |
2837 | -- analysis. | |
996ae0b0 | 2838 | |
8fde064e | 2839 | elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
996ae0b0 RK |
2840 | return; |
2841 | ||
2842 | else | |
fbf5a39b | 2843 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
2844 | |
2845 | if Nkind (N) = N_Subprogram_Body_Stub | |
2846 | or else No (Corresponding_Spec (N)) | |
2847 | then | |
d44202ba HK |
2848 | if Is_Private_Concurrent_Primitive (Body_Id) then |
2849 | Spec_Id := Disambiguate_Spec; | |
2850 | else | |
2851 | Spec_Id := Find_Corresponding_Spec (N); | |
2852 | end if; | |
996ae0b0 RK |
2853 | |
2854 | -- If this is a duplicate body, no point in analyzing it | |
2855 | ||
2856 | if Error_Posted (N) then | |
2857 | return; | |
2858 | end if; | |
2859 | ||
82c80734 RD |
2860 | -- A subprogram body should cause freezing of its own declaration, |
2861 | -- but if there was no previous explicit declaration, then the | |
2862 | -- subprogram will get frozen too late (there may be code within | |
2863 | -- the body that depends on the subprogram having been frozen, | |
2864 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 2865 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
2866 | -- Finally, if the return type is an anonymous access to protected |
2867 | -- subprogram, it must be frozen before the body because its | |
2868 | -- expansion has generated an equivalent type that is used when | |
2869 | -- elaborating the body. | |
996ae0b0 | 2870 | |
885c4871 | 2871 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
2872 | -- created for expression functions do not freeze. |
2873 | ||
2874 | if No (Spec_Id) | |
2875 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
2876 | then | |
996ae0b0 RK |
2877 | Freeze_Before (N, Body_Id); |
2878 | ||
2879 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
2880 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
2881 | |
2882 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
2883 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 2884 | end if; |
a38ff9b1 | 2885 | |
996ae0b0 RK |
2886 | else |
2887 | Spec_Id := Corresponding_Spec (N); | |
2888 | end if; | |
2889 | end if; | |
2890 | ||
e28072cd | 2891 | -- Language-defined aspects cannot appear in a subprogram body [stub] if |
882eadaf RD |
2892 | -- the subprogram has a separate spec. Certainly implementation-defined |
2893 | -- aspects are allowed to appear (per Aspects_On_Body_Of_Stub_OK). | |
473e20df AC |
2894 | |
2895 | if Has_Aspects (N) then | |
cdcf1c7a | 2896 | if Present (Spec_Id) |
e28072cd AC |
2897 | and then not Aspects_On_Body_Or_Stub_OK (N) |
2898 | ||
2899 | -- Do not emit an error on a subprogram body stub that act as | |
2900 | -- its own spec. | |
2901 | ||
2902 | and then Nkind (Parent (Parent (Spec_Id))) /= N_Subprogram_Body_Stub | |
cdcf1c7a | 2903 | then |
b4f149c2 | 2904 | Diagnose_Misplaced_Aspect_Specifications; |
e28072cd AC |
2905 | |
2906 | -- Delay the analysis of aspect specifications that apply to a body | |
2907 | -- stub until the proper body is analyzed. If the corresponding body | |
2908 | -- is missing, the aspects are still analyzed in Analyze_Proper_Body. | |
2909 | ||
2910 | elsif Nkind (N) in N_Body_Stub then | |
2911 | null; | |
2912 | ||
473e20df AC |
2913 | else |
2914 | Analyze_Aspect_Specifications (N, Body_Id); | |
2915 | end if; | |
2916 | end if; | |
2917 | ||
799d0e05 AC |
2918 | -- Previously we scanned the body to look for nested subprograms, and |
2919 | -- rejected an inline directive if nested subprograms were present, | |
2920 | -- because the back-end would generate conflicting symbols for the | |
c8957aae | 2921 | -- nested bodies. This is now unnecessary. |
07fc65c4 | 2922 | |
c8957aae | 2923 | -- Look ahead to recognize a pragma Inline that appears after the body |
84f4072a | 2924 | |
e660dbf7 JM |
2925 | Check_Inline_Pragma (Spec_Id); |
2926 | ||
701b7fbb RD |
2927 | -- Deal with special case of a fully private operation in the body of |
2928 | -- the protected type. We must create a declaration for the subprogram, | |
2929 | -- in order to attach the protected subprogram that will be used in | |
2930 | -- internal calls. We exclude compiler generated bodies from the | |
2931 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 2932 | |
996ae0b0 RK |
2933 | if No (Spec_Id) |
2934 | and then Comes_From_Source (N) | |
2935 | and then Is_Protected_Type (Current_Scope) | |
2936 | then | |
47bfea3a | 2937 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 2938 | end if; |
996ae0b0 | 2939 | |
5334d18f | 2940 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 2941 | |
701b7fbb | 2942 | if Present (Spec_Id) then |
996ae0b0 | 2943 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 2944 | Verify_Overriding_Indicator; |
5d37ba92 ES |
2945 | |
2946 | -- In general, the spec will be frozen when we start analyzing the | |
2947 | -- body. However, for internally generated operations, such as | |
2948 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
2949 | -- results, the spec may not have been frozen by the time we expand |
2950 | -- the freeze actions that include the bodies. In particular, extra | |
2951 | -- formals for accessibility or for return-in-place may need to be | |
2952 | -- generated. Freeze nodes, if any, are inserted before the current | |
2953 | -- body. These freeze actions are also needed in ASIS mode to enable | |
2954 | -- the proper back-annotations. | |
5d37ba92 ES |
2955 | |
2956 | if not Is_Frozen (Spec_Id) | |
7134062a | 2957 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
2958 | then |
2959 | -- Force the generation of its freezing node to ensure proper | |
2960 | -- management of access types in the backend. | |
2961 | ||
2962 | -- This is definitely needed for some cases, but it is not clear | |
2963 | -- why, to be investigated further??? | |
2964 | ||
2965 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 2966 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 2967 | end if; |
996ae0b0 RK |
2968 | end if; |
2969 | ||
a5d83d61 AC |
2970 | -- Mark presence of postcondition procedure in current scope and mark |
2971 | -- the procedure itself as needing debug info. The latter is important | |
2972 | -- when analyzing decision coverage (for example, for MC/DC coverage). | |
7ca78bba | 2973 | |
0dabde3a ES |
2974 | if Chars (Body_Id) = Name_uPostconditions then |
2975 | Set_Has_Postconditions (Current_Scope); | |
a5d83d61 | 2976 | Set_Debug_Info_Needed (Body_Id); |
0dabde3a ES |
2977 | end if; |
2978 | ||
996ae0b0 RK |
2979 | -- Place subprogram on scope stack, and make formals visible. If there |
2980 | -- is a spec, the visible entity remains that of the spec. | |
2981 | ||
2982 | if Present (Spec_Id) then | |
07fc65c4 | 2983 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
2984 | |
2985 | if Is_Child_Unit (Spec_Id) then | |
2986 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
2987 | end if; | |
2988 | ||
fbf5a39b AC |
2989 | if Style_Check then |
2990 | Style.Check_Identifier (Body_Id, Spec_Id); | |
2991 | end if; | |
996ae0b0 RK |
2992 | |
2993 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2994 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2995 | ||
f937473f | 2996 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 2997 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
996ae0b0 | 2998 | return; |
21d27997 | 2999 | |
996ae0b0 RK |
3000 | else |
3001 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
3002 | Set_Has_Completion (Spec_Id); | |
3003 | ||
3004 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 3005 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
3006 | end if; |
3007 | ||
3008 | -- If this is a body generated for a renaming, do not check for | |
3009 | -- full conformance. The check is redundant, because the spec of | |
3010 | -- the body is a copy of the spec in the renaming declaration, | |
3011 | -- and the test can lead to spurious errors on nested defaults. | |
3012 | ||
3013 | if Present (Spec_Decl) | |
996ae0b0 | 3014 | and then not Comes_From_Source (N) |
93a81b02 GB |
3015 | and then |
3016 | (Nkind (Original_Node (Spec_Decl)) = | |
d2f97d3e | 3017 | N_Subprogram_Renaming_Declaration |
466c2127 AC |
3018 | or else (Present (Corresponding_Body (Spec_Decl)) |
3019 | and then | |
3020 | Nkind (Unit_Declaration_Node | |
3021 | (Corresponding_Body (Spec_Decl))) = | |
3022 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
3023 | then |
3024 | Conformant := True; | |
cabe9abc AC |
3025 | |
3026 | -- Conversely, the spec may have been generated for specless body | |
3027 | -- with an inline pragma. | |
3028 | ||
3029 | elsif Comes_From_Source (N) | |
3030 | and then not Comes_From_Source (Spec_Id) | |
3031 | and then Has_Pragma_Inline (Spec_Id) | |
3032 | then | |
3033 | Conformant := True; | |
76a69663 | 3034 | |
996ae0b0 RK |
3035 | else |
3036 | Check_Conformance | |
3037 | (Body_Id, Spec_Id, | |
76a69663 | 3038 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
3039 | end if; |
3040 | ||
3041 | -- If the body is not fully conformant, we have to decide if we | |
3042 | -- should analyze it or not. If it has a really messed up profile | |
3043 | -- then we probably should not analyze it, since we will get too | |
3044 | -- many bogus messages. | |
3045 | ||
3046 | -- Our decision is to go ahead in the non-fully conformant case | |
3047 | -- only if it is at least mode conformant with the spec. Note | |
3048 | -- that the call to Check_Fully_Conformant has issued the proper | |
3049 | -- error messages to complain about the lack of conformance. | |
3050 | ||
3051 | if not Conformant | |
3052 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
3053 | then | |
3054 | return; | |
3055 | end if; | |
3056 | end if; | |
3057 | ||
996ae0b0 | 3058 | if Spec_Id /= Body_Id then |
fbf5a39b | 3059 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
3060 | end if; |
3061 | ||
579847c2 AC |
3062 | Set_Ekind (Body_Id, E_Subprogram_Body); |
3063 | ||
e28072cd AC |
3064 | if Nkind (N) = N_Subprogram_Body_Stub then |
3065 | Set_Corresponding_Spec_Of_Stub (N, Spec_Id); | |
3066 | ||
3067 | -- Regular body | |
3068 | ||
3069 | else | |
996ae0b0 | 3070 | Set_Corresponding_Spec (N, Spec_Id); |
758c442c | 3071 | |
5d37ba92 ES |
3072 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
3073 | -- of a concurrent type, the type of the first parameter has been | |
3074 | -- replaced with the corresponding record, which is the proper | |
3075 | -- run-time structure to use. However, within the body there may | |
3076 | -- be uses of the formals that depend on primitive operations | |
3077 | -- of the type (in particular calls in prefixed form) for which | |
3078 | -- we need the original concurrent type. The operation may have | |
3079 | -- several controlling formals, so the replacement must be done | |
3080 | -- for all of them. | |
758c442c GD |
3081 | |
3082 | if Comes_From_Source (Spec_Id) | |
3083 | and then Present (First_Entity (Spec_Id)) | |
3084 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
3085 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
15918371 AC |
3086 | and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
3087 | and then Present (Corresponding_Concurrent_Type | |
3088 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 3089 | then |
5d37ba92 ES |
3090 | declare |
3091 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
3092 | Form : Entity_Id; | |
3093 | ||
3094 | begin | |
3095 | Form := First_Formal (Spec_Id); | |
3096 | while Present (Form) loop | |
3097 | if Etype (Form) = Typ then | |
3098 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
3099 | end if; | |
3100 | ||
3101 | Next_Formal (Form); | |
3102 | end loop; | |
3103 | end; | |
758c442c GD |
3104 | end if; |
3105 | ||
21d27997 RD |
3106 | -- Make the formals visible, and place subprogram on scope stack. |
3107 | -- This is also the point at which we set Last_Real_Spec_Entity | |
3108 | -- to mark the entities which will not be moved to the body. | |
758c442c | 3109 | |
996ae0b0 | 3110 | Install_Formals (Spec_Id); |
21d27997 | 3111 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
616547fa AC |
3112 | |
3113 | -- Within an instance, add local renaming declarations so that | |
a5a809b2 AC |
3114 | -- gdb can retrieve the values of actuals more easily. This is |
3115 | -- only relevant if generating code (and indeed we definitely | |
3116 | -- do not want these definitions -gnatc mode, because that would | |
3117 | -- confuse ASIS). | |
616547fa AC |
3118 | |
3119 | if Is_Generic_Instance (Spec_Id) | |
3120 | and then Is_Wrapper_Package (Current_Scope) | |
a5a809b2 | 3121 | and then Expander_Active |
616547fa AC |
3122 | then |
3123 | Build_Subprogram_Instance_Renamings (N, Current_Scope); | |
3124 | end if; | |
3125 | ||
0a36105d | 3126 | Push_Scope (Spec_Id); |
996ae0b0 RK |
3127 | |
3128 | -- Make sure that the subprogram is immediately visible. For | |
3129 | -- child units that have no separate spec this is indispensable. | |
3130 | -- Otherwise it is safe albeit redundant. | |
3131 | ||
3132 | Set_Is_Immediately_Visible (Spec_Id); | |
3133 | end if; | |
3134 | ||
3135 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
ea3c0651 | 3136 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
996ae0b0 | 3137 | Set_Scope (Body_Id, Scope (Spec_Id)); |
ec4867fa | 3138 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
996ae0b0 RK |
3139 | |
3140 | -- Case of subprogram body with no previous spec | |
3141 | ||
3142 | else | |
3e5daac4 AC |
3143 | -- Check for style warning required |
3144 | ||
996ae0b0 | 3145 | if Style_Check |
3e5daac4 AC |
3146 | |
3147 | -- Only apply check for source level subprograms for which checks | |
3148 | -- have not been suppressed. | |
3149 | ||
996ae0b0 RK |
3150 | and then Comes_From_Source (Body_Id) |
3151 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
3152 | |
3153 | -- No warnings within an instance | |
3154 | ||
996ae0b0 | 3155 | and then not In_Instance |
3e5daac4 | 3156 | |
b0186f71 | 3157 | -- No warnings for expression functions |
3e5daac4 | 3158 | |
b0186f71 | 3159 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
3160 | then |
3161 | Style.Body_With_No_Spec (N); | |
3162 | end if; | |
3163 | ||
3164 | New_Overloaded_Entity (Body_Id); | |
3165 | ||
3166 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
3167 | Set_Acts_As_Spec (N); | |
3168 | Generate_Definition (Body_Id); | |
dac3bede | 3169 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
fbf5a39b AC |
3170 | Generate_Reference |
3171 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 3172 | Install_Formals (Body_Id); |
e949ee22 | 3173 | |
4a854847 | 3174 | Push_Scope (Body_Id); |
996ae0b0 | 3175 | end if; |
dbe36d67 AC |
3176 | |
3177 | -- For stubs and bodies with no previous spec, generate references to | |
3178 | -- formals. | |
3179 | ||
3180 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
3181 | end if; |
3182 | ||
5216b599 AC |
3183 | -- Set SPARK_Mode from context |
3184 | ||
3185 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); | |
3186 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
3187 | ||
76a69663 ES |
3188 | -- If the return type is an anonymous access type whose designated type |
3189 | -- is the limited view of a class-wide type and the non-limited view is | |
3190 | -- available, update the return type accordingly. | |
ec4867fa | 3191 | |
8fde064e | 3192 | if Ada_Version >= Ada_2005 and then Comes_From_Source (N) then |
ec4867fa | 3193 | declare |
ec4867fa | 3194 | Etyp : Entity_Id; |
0a36105d | 3195 | Rtyp : Entity_Id; |
ec4867fa ES |
3196 | |
3197 | begin | |
0a36105d JM |
3198 | Rtyp := Etype (Current_Scope); |
3199 | ||
3200 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
3201 | Etyp := Directly_Designated_Type (Rtyp); | |
3202 | ||
7b56a91b AC |
3203 | if Is_Class_Wide_Type (Etyp) |
3204 | and then From_Limited_With (Etyp) | |
3205 | then | |
0a36105d JM |
3206 | Set_Directly_Designated_Type |
3207 | (Etype (Current_Scope), Available_View (Etyp)); | |
3208 | end if; | |
3209 | end if; | |
ec4867fa ES |
3210 | end; |
3211 | end if; | |
3212 | ||
996ae0b0 RK |
3213 | -- If this is the proper body of a stub, we must verify that the stub |
3214 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 3215 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
3216 | -- only required for subprograms that come from source. |
3217 | ||
3218 | if Nkind (Parent (N)) = N_Subunit | |
3219 | and then Comes_From_Source (N) | |
3220 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
3221 | and then Nkind (Corresponding_Stub (Parent (N))) = |
3222 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
3223 | then |
3224 | declare | |
fbf5a39b AC |
3225 | Old_Id : constant Entity_Id := |
3226 | Defining_Entity | |
3227 | (Specification (Corresponding_Stub (Parent (N)))); | |
3228 | ||
996ae0b0 | 3229 | Conformant : Boolean := False; |
996ae0b0 RK |
3230 | |
3231 | begin | |
3232 | if No (Spec_Id) then | |
3233 | Check_Fully_Conformant (Body_Id, Old_Id); | |
3234 | ||
3235 | else | |
3236 | Check_Conformance | |
3237 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
3238 | ||
3239 | if not Conformant then | |
3240 | ||
dbe36d67 AC |
3241 | -- The stub was taken to be a new declaration. Indicate that |
3242 | -- it lacks a body. | |
996ae0b0 RK |
3243 | |
3244 | Set_Has_Completion (Old_Id, False); | |
3245 | end if; | |
3246 | end if; | |
3247 | end; | |
3248 | end if; | |
3249 | ||
3250 | Set_Has_Completion (Body_Id); | |
3251 | Check_Eliminated (Body_Id); | |
3252 | ||
3253 | if Nkind (N) = N_Subprogram_Body_Stub then | |
3254 | return; | |
84f4072a | 3255 | end if; |
996ae0b0 | 3256 | |
84f4072a JM |
3257 | -- Handle frontend inlining. There is no need to prepare us for inlining |
3258 | -- if we will not generate the code. | |
3259 | ||
3260 | -- Old semantics | |
3261 | ||
3262 | if not Debug_Flag_Dot_K then | |
3263 | if Present (Spec_Id) | |
3264 | and then Expander_Active | |
3265 | and then | |
3266 | (Has_Pragma_Inline_Always (Spec_Id) | |
8fde064e | 3267 | or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining)) |
84f4072a JM |
3268 | then |
3269 | Build_Body_To_Inline (N, Spec_Id); | |
3270 | end if; | |
3271 | ||
3272 | -- New semantics | |
3273 | ||
3274 | elsif Expander_Active | |
3275 | and then Serious_Errors_Detected = 0 | |
3276 | and then Present (Spec_Id) | |
3277 | and then Has_Pragma_Inline (Spec_Id) | |
996ae0b0 | 3278 | then |
84f4072a | 3279 | Check_And_Build_Body_To_Inline (N, Spec_Id, Body_Id); |
996ae0b0 RK |
3280 | end if; |
3281 | ||
0ab80019 | 3282 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 3283 | -- of the specification we have to install the private withed units. |
21d27997 | 3284 | -- This holds for child units as well. |
9bc856dd AC |
3285 | |
3286 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 3287 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
3288 | then |
3289 | Install_Private_With_Clauses (Body_Id); | |
3290 | end if; | |
3291 | ||
ec4867fa ES |
3292 | Check_Anonymous_Return; |
3293 | ||
fdce4bb7 JM |
3294 | -- Set the Protected_Formal field of each extra formal of the protected |
3295 | -- subprogram to reference the corresponding extra formal of the | |
3296 | -- subprogram that implements it. For regular formals this occurs when | |
3297 | -- the protected subprogram's declaration is expanded, but the extra | |
3298 | -- formals don't get created until the subprogram is frozen. We need to | |
3299 | -- do this before analyzing the protected subprogram's body so that any | |
3300 | -- references to the original subprogram's extra formals will be changed | |
3301 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
3302 | ||
3303 | if Present (Spec_Id) | |
3304 | and then Is_Protected_Type (Scope (Spec_Id)) | |
3305 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
3306 | then | |
3307 | declare | |
3308 | Impl_Subp : constant Entity_Id := | |
3309 | Protected_Body_Subprogram (Spec_Id); | |
3310 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
3311 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
3312 | begin |
3313 | while Present (Prot_Ext_Formal) loop | |
3314 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 3315 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
3316 | Next_Formal_With_Extras (Prot_Ext_Formal); |
3317 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
3318 | end loop; | |
3319 | end; | |
3320 | end if; | |
3321 | ||
0868e09c | 3322 | -- Now we can go on to analyze the body |
996ae0b0 RK |
3323 | |
3324 | HSS := Handled_Statement_Sequence (N); | |
3325 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 3326 | |
ea3c0651 AC |
3327 | -- Deal with [refined] preconditions, postconditions, Contract_Cases, |
3328 | -- invariants and predicates associated with the body and its spec. | |
3329 | -- Note that this is not pure expansion as Expand_Subprogram_Contract | |
3330 | -- prepares the contract assertions for generic subprograms or for ASIS. | |
3331 | -- Do not generate contract checks in SPARK mode. | |
21d27997 | 3332 | |
f5da7a97 | 3333 | if not GNATprove_Mode then |
ea3c0651 | 3334 | Expand_Subprogram_Contract (N, Spec_Id, Body_Id); |
483361a6 | 3335 | end if; |
21d27997 | 3336 | |
f3d0f304 | 3337 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
3338 | -- for discriminals and privals and finally a declaration for the entry |
3339 | -- family index (if applicable). This form of early expansion is done | |
3340 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 | 3341 | -- references entities which were created during regular expansion. The |
3b8056a5 AC |
3342 | -- subprogram entity must come from source, and not be an internally |
3343 | -- generated subprogram. | |
21d27997 | 3344 | |
4460a9bc | 3345 | if Expander_Active |
21d27997 RD |
3346 | and then Present (Prot_Typ) |
3347 | and then Present (Spec_Id) | |
3b8056a5 | 3348 | and then Comes_From_Source (Spec_Id) |
21d27997 RD |
3349 | and then not Is_Eliminated (Spec_Id) |
3350 | then | |
3351 | Install_Private_Data_Declarations | |
3352 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
3353 | end if; | |
3354 | ||
5dcab3ca AC |
3355 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
3356 | -- may now appear in parameter and result profiles. Since the analysis | |
3357 | -- of a subprogram body may use the parameter and result profile of the | |
3358 | -- spec, swap any limited views with their non-limited counterpart. | |
3359 | ||
3360 | if Ada_Version >= Ada_2012 then | |
3361 | Exchange_Limited_Views (Spec_Id); | |
3362 | end if; | |
3363 | ||
21d27997 RD |
3364 | -- Analyze the declarations (this call will analyze the precondition |
3365 | -- Check pragmas we prepended to the list, as well as the declaration | |
3366 | -- of the _Postconditions procedure). | |
3367 | ||
996ae0b0 | 3368 | Analyze_Declarations (Declarations (N)); |
21d27997 | 3369 | |
f90d14ac AC |
3370 | -- After declarations have been analyzed, the body has been set |
3371 | -- its final value of SPARK_Mode. Check that SPARK_Mode for body | |
3372 | -- is consistent with SPARK_Mode for spec. | |
3373 | ||
3374 | if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then | |
3375 | if Present (SPARK_Pragma (Spec_Id)) then | |
3376 | if Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Spec_Id)) = Off | |
3377 | and then | |
3378 | Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Body_Id)) = On | |
3379 | then | |
3380 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3381 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3382 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); | |
3383 | Error_Msg_NE | |
cf3e6845 | 3384 | ("\value Off was set for SPARK_Mode on&#", N, Spec_Id); |
f90d14ac AC |
3385 | end if; |
3386 | ||
3387 | elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then | |
3388 | null; | |
3389 | ||
3390 | else | |
3391 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3392 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3393 | Error_Msg_Sloc := Sloc (Spec_Id); | |
cf3e6845 | 3394 | Error_Msg_NE ("\no value was set for SPARK_Mode on&#", N, Spec_Id); |
f90d14ac AC |
3395 | end if; |
3396 | end if; | |
3397 | ||
21d27997 RD |
3398 | -- Check completion, and analyze the statements |
3399 | ||
996ae0b0 | 3400 | Check_Completion; |
33931112 | 3401 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 3402 | Analyze (HSS); |
21d27997 RD |
3403 | |
3404 | -- Deal with end of scope processing for the body | |
3405 | ||
07fc65c4 | 3406 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
3407 | End_Scope; |
3408 | Check_Subprogram_Order (N); | |
c37bb106 | 3409 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
3410 | |
3411 | -- If we have a separate spec, then the analysis of the declarations | |
3412 | -- caused the entities in the body to be chained to the spec id, but | |
3413 | -- we want them chained to the body id. Only the formal parameters | |
3414 | -- end up chained to the spec id in this case. | |
3415 | ||
3416 | if Present (Spec_Id) then | |
3417 | ||
d39d6bb8 | 3418 | -- We must conform to the categorization of our spec |
996ae0b0 | 3419 | |
d39d6bb8 | 3420 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 3421 | |
d39d6bb8 RD |
3422 | -- And if this is a child unit, the parent units must conform |
3423 | ||
3424 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
3425 | Validate_Categorization_Dependency |
3426 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
3427 | end if; | |
3428 | ||
21d27997 RD |
3429 | -- Here is where we move entities from the spec to the body |
3430 | ||
3431 | -- Case where there are entities that stay with the spec | |
3432 | ||
3433 | if Present (Last_Real_Spec_Entity) then | |
3434 | ||
dbe36d67 AC |
3435 | -- No body entities (happens when the only real spec entities come |
3436 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
3437 | |
3438 | if No (Last_Entity (Body_Id)) then | |
3439 | Set_First_Entity | |
3440 | (Body_Id, Next_Entity (Last_Real_Spec_Entity)); | |
3441 | ||
3442 | -- Body entities present (formals), so chain stuff past them | |
3443 | ||
3444 | else | |
3445 | Set_Next_Entity | |
3446 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
3447 | end if; | |
3448 | ||
3449 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 3450 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
3451 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
3452 | ||
dbe36d67 AC |
3453 | -- Case where there are no spec entities, in this case there can be |
3454 | -- no body entities either, so just move everything. | |
996ae0b0 RK |
3455 | |
3456 | else | |
21d27997 | 3457 | pragma Assert (No (Last_Entity (Body_Id))); |
996ae0b0 RK |
3458 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
3459 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
3460 | Set_First_Entity (Spec_Id, Empty); | |
3461 | Set_Last_Entity (Spec_Id, Empty); | |
3462 | end if; | |
3463 | end if; | |
3464 | ||
7665e4bd | 3465 | Check_Missing_Return; |
996ae0b0 | 3466 | |
82c80734 | 3467 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
3468 | -- the body of the procedure. But first we deal with a special case |
3469 | -- where we want to modify this check. If the body of the subprogram | |
3470 | -- starts with a raise statement or its equivalent, or if the body | |
cf3e6845 AC |
3471 | -- consists entirely of a null statement, then it is pretty obvious that |
3472 | -- it is OK to not reference the parameters. For example, this might be | |
3473 | -- the following common idiom for a stubbed function: statement of the | |
3474 | -- procedure raises an exception. In particular this deals with the | |
3475 | -- common idiom of a stubbed function, which appears something like: | |
fbf5a39b AC |
3476 | |
3477 | -- function F (A : Integer) return Some_Type; | |
3478 | -- X : Some_Type; | |
3479 | -- begin | |
3480 | -- raise Program_Error; | |
3481 | -- return X; | |
3482 | -- end F; | |
3483 | ||
76a69663 ES |
3484 | -- Here the purpose of X is simply to satisfy the annoying requirement |
3485 | -- in Ada that there be at least one return, and we certainly do not | |
a90bd866 | 3486 | -- want to go posting warnings on X that it is not initialized. On |
76a69663 ES |
3487 | -- the other hand, if X is entirely unreferenced that should still |
3488 | -- get a warning. | |
3489 | ||
3490 | -- What we do is to detect these cases, and if we find them, flag the | |
3491 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
3492 | -- suppress unwanted warnings. For the case of the function stub above | |
3493 | -- we have a special test to set X as apparently assigned to suppress | |
3494 | -- the warning. | |
996ae0b0 RK |
3495 | |
3496 | declare | |
800621e0 | 3497 | Stm : Node_Id; |
996ae0b0 RK |
3498 | |
3499 | begin | |
0a36105d JM |
3500 | -- Skip initial labels (for one thing this occurs when we are in |
3501 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
3502 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 3503 | |
800621e0 | 3504 | Stm := First (Statements (HSS)); |
0a36105d JM |
3505 | while Nkind (Stm) = N_Label |
3506 | or else Nkind (Stm) in N_Push_xxx_Label | |
3507 | loop | |
996ae0b0 | 3508 | Next (Stm); |
0a36105d | 3509 | end loop; |
996ae0b0 | 3510 | |
fbf5a39b AC |
3511 | -- Do the test on the original statement before expansion |
3512 | ||
3513 | declare | |
3514 | Ostm : constant Node_Id := Original_Node (Stm); | |
3515 | ||
3516 | begin | |
76a69663 | 3517 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
3518 | |
3519 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
3520 | Set_Trivial_Subprogram (Stm); |
3521 | ||
f3d57416 | 3522 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
3523 | |
3524 | elsif Nkind (Stm) = N_Null_Statement | |
3525 | and then Comes_From_Source (Stm) | |
3526 | and then No (Next (Stm)) | |
3527 | then | |
3528 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
3529 | |
3530 | -- Check for explicit call cases which likely raise an exception | |
3531 | ||
3532 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
3533 | if Is_Entity_Name (Name (Ostm)) then | |
3534 | declare | |
3535 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
3536 | ||
3537 | begin | |
3538 | -- If the procedure is marked No_Return, then likely it | |
3539 | -- raises an exception, but in any case it is not coming | |
76a69663 | 3540 | -- back here, so turn on the flag. |
fbf5a39b | 3541 | |
f46faa08 AC |
3542 | if Present (Ent) |
3543 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
3544 | and then No_Return (Ent) |
3545 | then | |
76a69663 | 3546 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
3547 | end if; |
3548 | end; | |
3549 | end if; | |
3550 | end if; | |
3551 | end; | |
996ae0b0 RK |
3552 | end; |
3553 | ||
3554 | -- Check for variables that are never modified | |
3555 | ||
3556 | declare | |
3557 | E1, E2 : Entity_Id; | |
3558 | ||
3559 | begin | |
fbf5a39b | 3560 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
3561 | -- flags from out parameters to the corresponding entities in the |
3562 | -- body. The reason we do that is we want to post error flags on | |
3563 | -- the body entities, not the spec entities. | |
3564 | ||
3565 | if Present (Spec_Id) then | |
3566 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
3567 | while Present (E1) loop |
3568 | if Ekind (E1) = E_Out_Parameter then | |
3569 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 3570 | while Present (E2) loop |
996ae0b0 RK |
3571 | exit when Chars (E1) = Chars (E2); |
3572 | Next_Entity (E2); | |
3573 | end loop; | |
3574 | ||
fbf5a39b AC |
3575 | if Present (E2) then |
3576 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
3577 | end if; | |
996ae0b0 RK |
3578 | end if; |
3579 | ||
3580 | Next_Entity (E1); | |
3581 | end loop; | |
3582 | end if; | |
3583 | ||
2aca76d6 | 3584 | -- Check references in body |
0868e09c | 3585 | |
2aca76d6 | 3586 | Check_References (Body_Id); |
996ae0b0 | 3587 | end; |
b1b543d2 | 3588 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 | 3589 | |
5afe5d2d HK |
3590 | --------------------------------- |
3591 | -- Analyze_Subprogram_Contract -- | |
3592 | --------------------------------- | |
3593 | ||
3594 | procedure Analyze_Subprogram_Contract (Subp : Entity_Id) is | |
36eef04a AC |
3595 | Items : constant Node_Id := Contract (Subp); |
3596 | Case_Prag : Node_Id := Empty; | |
3597 | Depends : Node_Id := Empty; | |
3598 | Global : Node_Id := Empty; | |
3599 | Nam : Name_Id; | |
3600 | Post_Prag : Node_Id := Empty; | |
3601 | Prag : Node_Id; | |
3602 | Seen_In_Case : Boolean := False; | |
3603 | Seen_In_Post : Boolean := False; | |
5afe5d2d HK |
3604 | |
3605 | begin | |
5afe5d2d HK |
3606 | if Present (Items) then |
3607 | ||
3608 | -- Analyze pre- and postconditions | |
3609 | ||
3610 | Prag := Pre_Post_Conditions (Items); | |
3611 | while Present (Prag) loop | |
ea3c0651 | 3612 | Analyze_Pre_Post_Condition_In_Decl_Part (Prag, Subp); |
5afe5d2d HK |
3613 | |
3614 | -- Verify whether a postcondition mentions attribute 'Result and | |
3615 | -- its expression introduces a post-state. | |
3616 | ||
3617 | if Warn_On_Suspicious_Contract | |
3618 | and then Pragma_Name (Prag) = Name_Postcondition | |
3619 | then | |
36eef04a AC |
3620 | Post_Prag := Prag; |
3621 | Check_Result_And_Post_State (Prag, Seen_In_Post); | |
5afe5d2d HK |
3622 | end if; |
3623 | ||
3624 | Prag := Next_Pragma (Prag); | |
3625 | end loop; | |
3626 | ||
3627 | -- Analyze contract-cases and test-cases | |
3628 | ||
3629 | Prag := Contract_Test_Cases (Items); | |
3630 | while Present (Prag) loop | |
ea3c0651 AC |
3631 | Nam := Pragma_Name (Prag); |
3632 | ||
3633 | if Nam = Name_Contract_Cases then | |
5afe5d2d HK |
3634 | Analyze_Contract_Cases_In_Decl_Part (Prag); |
3635 | ||
3636 | -- Verify whether contract-cases mention attribute 'Result and | |
3637 | -- its expression introduces a post-state. Perform the check | |
3638 | -- only when the pragma is legal. | |
3639 | ||
3640 | if Warn_On_Suspicious_Contract | |
3641 | and then not Error_Posted (Prag) | |
3642 | then | |
36eef04a AC |
3643 | Case_Prag := Prag; |
3644 | Check_Result_And_Post_State (Prag, Seen_In_Case); | |
5afe5d2d HK |
3645 | end if; |
3646 | ||
3647 | else | |
ea3c0651 | 3648 | pragma Assert (Nam = Name_Test_Case); |
5afe5d2d HK |
3649 | Analyze_Test_Case_In_Decl_Part (Prag, Subp); |
3650 | end if; | |
3651 | ||
3652 | Prag := Next_Pragma (Prag); | |
3653 | end loop; | |
3654 | ||
3655 | -- Analyze classification pragmas | |
3656 | ||
6c3c671e | 3657 | Prag := Classifications (Items); |
5afe5d2d | 3658 | while Present (Prag) loop |
ea3c0651 AC |
3659 | Nam := Pragma_Name (Prag); |
3660 | ||
3661 | if Nam = Name_Depends then | |
54e28df2 HK |
3662 | Depends := Prag; |
3663 | else pragma Assert (Nam = Name_Global); | |
3664 | Global := Prag; | |
5afe5d2d HK |
3665 | end if; |
3666 | ||
3667 | Prag := Next_Pragma (Prag); | |
3668 | end loop; | |
54e28df2 HK |
3669 | |
3670 | -- Analyze Global first as Depends may mention items classified in | |
3671 | -- the global categorization. | |
3672 | ||
3673 | if Present (Global) then | |
3674 | Analyze_Global_In_Decl_Part (Global); | |
3675 | end if; | |
3676 | ||
3677 | -- Depends must be analyzed after Global in order to see the modes of | |
3678 | -- all global items. | |
3679 | ||
3680 | if Present (Depends) then | |
3681 | Analyze_Depends_In_Decl_Part (Depends); | |
3682 | end if; | |
5afe5d2d HK |
3683 | end if; |
3684 | ||
36eef04a | 3685 | -- Emit an error when neither the postconditions nor the contract-cases |
5afe5d2d HK |
3686 | -- mention attribute 'Result in the context of a function. |
3687 | ||
3688 | if Warn_On_Suspicious_Contract | |
3689 | and then Ekind_In (Subp, E_Function, E_Generic_Function) | |
5afe5d2d | 3690 | then |
36eef04a AC |
3691 | if Present (Case_Prag) |
3692 | and then not Seen_In_Case | |
3693 | and then Present (Post_Prag) | |
3694 | and then not Seen_In_Post | |
3695 | then | |
5afe5d2d HK |
3696 | Error_Msg_N |
3697 | ("neither function postcondition nor contract cases mention " | |
36eef04a | 3698 | & "result?T?", Post_Prag); |
5afe5d2d | 3699 | |
36eef04a | 3700 | elsif Present (Case_Prag) and then not Seen_In_Case then |
5afe5d2d | 3701 | Error_Msg_N |
36eef04a | 3702 | ("contract cases do not mention result?T?", Case_Prag); |
5afe5d2d | 3703 | |
f660fba6 AC |
3704 | -- OK if we have at least one IN OUT parameter |
3705 | ||
36eef04a | 3706 | elsif Present (Post_Prag) and then not Seen_In_Post then |
f660fba6 AC |
3707 | declare |
3708 | F : Entity_Id; | |
3709 | begin | |
3710 | F := First_Formal (Subp); | |
3711 | while Present (F) loop | |
3712 | if Ekind (F) = E_In_Out_Parameter then | |
3713 | return; | |
3714 | else | |
3715 | Next_Formal (F); | |
3716 | end if; | |
3717 | end loop; | |
3718 | end; | |
3719 | ||
3720 | -- If no in-out parameters and no mention of Result, the contract | |
3721 | -- is certainly suspicious. | |
3722 | ||
5afe5d2d | 3723 | Error_Msg_N |
36eef04a | 3724 | ("function postcondition does not mention result?T?", Post_Prag); |
5afe5d2d HK |
3725 | end if; |
3726 | end if; | |
3727 | end Analyze_Subprogram_Contract; | |
3728 | ||
996ae0b0 RK |
3729 | ------------------------------------ |
3730 | -- Analyze_Subprogram_Declaration -- | |
3731 | ------------------------------------ | |
3732 | ||
3733 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
579847c2 | 3734 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc | 3735 | Designator : Entity_Id; |
579847c2 | 3736 | |
4d8f3296 ES |
3737 | Is_Completion : Boolean; |
3738 | -- Indicates whether a null procedure declaration is a completion | |
996ae0b0 RK |
3739 | |
3740 | begin | |
2ba431e5 | 3741 | -- Null procedures are not allowed in SPARK |
daec8eeb | 3742 | |
fe5d3068 | 3743 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
3744 | and then Null_Present (Specification (N)) |
3745 | then | |
2ba431e5 | 3746 | Check_SPARK_Restriction ("null procedure is not allowed", N); |
718deaf1 | 3747 | |
4d8f3296 ES |
3748 | if Is_Protected_Type (Current_Scope) then |
3749 | Error_Msg_N ("protected operation cannot be a null procedure", N); | |
3750 | end if; | |
718deaf1 | 3751 | |
4d8f3296 | 3752 | Analyze_Null_Procedure (N, Is_Completion); |
718deaf1 | 3753 | |
4d8f3296 | 3754 | if Is_Completion then |
718deaf1 | 3755 | |
4d8f3296 | 3756 | -- The null procedure acts as a body, nothing further is needed. |
5d5832bc | 3757 | |
4d8f3296 | 3758 | return; |
5d5832bc AC |
3759 | end if; |
3760 | end if; | |
3761 | ||
beacce02 | 3762 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
3763 | |
3764 | -- A reference may already have been generated for the unit name, in | |
3765 | -- which case the following call is redundant. However it is needed for | |
3766 | -- declarations that are the rewriting of an expression function. | |
3767 | ||
5d5832bc AC |
3768 | Generate_Definition (Designator); |
3769 | ||
f90d14ac AC |
3770 | -- Set SPARK mode from current context (may be overwritten later with |
3771 | -- explicit pragma). | |
4a854847 | 3772 | |
f90d14ac AC |
3773 | Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
3774 | Set_SPARK_Pragma_Inherited (Designator, True); | |
579847c2 | 3775 | |
b1b543d2 BD |
3776 | if Debug_Flag_C then |
3777 | Write_Str ("==> subprogram spec "); | |
3778 | Write_Name (Chars (Designator)); | |
3779 | Write_Str (" from "); | |
3780 | Write_Location (Sloc (N)); | |
3781 | Write_Eol; | |
3782 | Indent; | |
3783 | end if; | |
3784 | ||
996ae0b0 | 3785 | Validate_RCI_Subprogram_Declaration (N); |
996ae0b0 RK |
3786 | New_Overloaded_Entity (Designator); |
3787 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 3788 | |
cf3e6845 AC |
3789 | -- If the type of the first formal of the current subprogram is a non- |
3790 | -- generic tagged private type, mark the subprogram as being a private | |
3791 | -- primitive. Ditto if this is a function with controlling result, and | |
3792 | -- the return type is currently private. In both cases, the type of the | |
3793 | -- controlling argument or result must be in the current scope for the | |
3794 | -- operation to be primitive. | |
6ca063eb AC |
3795 | |
3796 | if Has_Controlling_Result (Designator) | |
3797 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 3798 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
3799 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
3800 | then | |
3801 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 3802 | |
6ca063eb | 3803 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
3804 | declare |
3805 | Formal_Typ : constant Entity_Id := | |
3806 | Etype (First_Formal (Designator)); | |
3807 | begin | |
3808 | Set_Is_Private_Primitive (Designator, | |
3809 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 3810 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
3811 | and then Is_Private_Type (Formal_Typ) |
3812 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
3813 | end; | |
3814 | end if; | |
3815 | ||
ec4867fa ES |
3816 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
3817 | -- or null. | |
3818 | ||
0791fbe9 | 3819 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
3820 | and then Comes_From_Source (N) |
3821 | and then Is_Dispatching_Operation (Designator) | |
3822 | then | |
3823 | declare | |
3824 | E : Entity_Id; | |
3825 | Etyp : Entity_Id; | |
3826 | ||
3827 | begin | |
3828 | if Has_Controlling_Result (Designator) then | |
3829 | Etyp := Etype (Designator); | |
3830 | ||
3831 | else | |
3832 | E := First_Entity (Designator); | |
3833 | while Present (E) | |
3834 | and then Is_Formal (E) | |
3835 | and then not Is_Controlling_Formal (E) | |
3836 | loop | |
3837 | Next_Entity (E); | |
3838 | end loop; | |
3839 | ||
3840 | Etyp := Etype (E); | |
3841 | end if; | |
3842 | ||
3843 | if Is_Access_Type (Etyp) then | |
3844 | Etyp := Directly_Designated_Type (Etyp); | |
3845 | end if; | |
3846 | ||
3847 | if Is_Interface (Etyp) | |
f937473f | 3848 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa | 3849 | and then not (Ekind (Designator) = E_Procedure |
8fde064e | 3850 | and then Null_Present (Specification (N))) |
ec4867fa ES |
3851 | then |
3852 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
3853 | |
3854 | -- Specialize error message based on procedures vs. functions, | |
3855 | -- since functions can't be null subprograms. | |
3856 | ||
3857 | if Ekind (Designator) = E_Procedure then | |
3858 | Error_Msg_N | |
3859 | ("interface procedure % must be abstract or null", N); | |
3860 | else | |
3861 | Error_Msg_N ("interface function % must be abstract", N); | |
3862 | end if; | |
ec4867fa ES |
3863 | end if; |
3864 | end; | |
3865 | end if; | |
3866 | ||
fbf5a39b AC |
3867 | -- What is the following code for, it used to be |
3868 | ||
3869 | -- ??? Set_Suppress_Elaboration_Checks | |
3870 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
3871 | ||
3872 | -- The following seems equivalent, but a bit dubious | |
3873 | ||
3874 | if Elaboration_Checks_Suppressed (Designator) then | |
3875 | Set_Kill_Elaboration_Checks (Designator); | |
3876 | end if; | |
996ae0b0 | 3877 | |
8fde064e | 3878 | if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then |
fbf5a39b | 3879 | Set_Categorization_From_Scope (Designator, Scop); |
8fde064e | 3880 | |
996ae0b0 | 3881 | else |
e895b435 | 3882 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 3883 | |
0a36105d | 3884 | Push_Scope (Designator); |
996ae0b0 RK |
3885 | Set_Categorization_From_Pragmas (N); |
3886 | Validate_Categorization_Dependency (N, Designator); | |
3887 | Pop_Scope; | |
3888 | end if; | |
3889 | ||
3890 | -- For a compilation unit, set body required. This flag will only be | |
3891 | -- reset if a valid Import or Interface pragma is processed later on. | |
3892 | ||
3893 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
3894 | Set_Body_Required (Parent (N), True); | |
758c442c | 3895 | |
0791fbe9 | 3896 | if Ada_Version >= Ada_2005 |
758c442c GD |
3897 | and then Nkind (Specification (N)) = N_Procedure_Specification |
3898 | and then Null_Present (Specification (N)) | |
3899 | then | |
3900 | Error_Msg_N | |
3901 | ("null procedure cannot be declared at library level", N); | |
3902 | end if; | |
996ae0b0 RK |
3903 | end if; |
3904 | ||
fbf5a39b | 3905 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 3906 | Check_Eliminated (Designator); |
fbf5a39b | 3907 | |
b1b543d2 BD |
3908 | if Debug_Flag_C then |
3909 | Outdent; | |
3910 | Write_Str ("<== subprogram spec "); | |
3911 | Write_Name (Chars (Designator)); | |
3912 | Write_Str (" from "); | |
3913 | Write_Location (Sloc (N)); | |
3914 | Write_Eol; | |
3915 | end if; | |
0f1a6a0b | 3916 | |
1a265e78 AC |
3917 | if Is_Protected_Type (Current_Scope) then |
3918 | ||
3919 | -- Indicate that this is a protected operation, because it may be | |
3920 | -- used in subsequent declarations within the protected type. | |
3921 | ||
3922 | Set_Convention (Designator, Convention_Protected); | |
3923 | end if; | |
3924 | ||
beacce02 | 3925 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
3926 | |
3927 | if Has_Aspects (N) then | |
3928 | Analyze_Aspect_Specifications (N, Designator); | |
3929 | end if; | |
996ae0b0 RK |
3930 | end Analyze_Subprogram_Declaration; |
3931 | ||
fbf5a39b AC |
3932 | -------------------------------------- |
3933 | -- Analyze_Subprogram_Specification -- | |
3934 | -------------------------------------- | |
3935 | ||
3936 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
3937 | -- declaration). This procedure is called to analyze the specification in | |
3938 | -- both subprogram bodies and subprogram declarations (specs). | |
3939 | ||
3940 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
3941 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 3942 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 3943 | |
758c442c GD |
3944 | -- Start of processing for Analyze_Subprogram_Specification |
3945 | ||
fbf5a39b | 3946 | begin |
2ba431e5 | 3947 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 3948 | |
db72f10a AC |
3949 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
3950 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
3951 | then | |
2ba431e5 | 3952 | Check_SPARK_Restriction ("user-defined operator is not allowed", N); |
38171f43 AC |
3953 | end if; |
3954 | ||
31af8899 AC |
3955 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
3956 | -- specification comes from an expression function, because it may be | |
3957 | -- the completion of a previous declaration. It is is not, the cross- | |
3958 | -- reference entry will be emitted for the new subprogram declaration. | |
3959 | ||
3960 | if Nkind (Parent (N)) /= N_Expression_Function then | |
3961 | Generate_Definition (Designator); | |
3962 | end if; | |
38171f43 | 3963 | |
dac3bede | 3964 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
fbf5a39b AC |
3965 | |
3966 | if Nkind (N) = N_Function_Specification then | |
3967 | Set_Ekind (Designator, E_Function); | |
3968 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
3969 | else |
3970 | Set_Ekind (Designator, E_Procedure); | |
3971 | Set_Etype (Designator, Standard_Void_Type); | |
3972 | end if; | |
3973 | ||
800621e0 | 3974 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
3975 | |
3976 | Set_Scope (Designator, Current_Scope); | |
3977 | ||
fbf5a39b | 3978 | if Present (Formals) then |
0a36105d | 3979 | Push_Scope (Designator); |
fbf5a39b | 3980 | Process_Formals (Formals, N); |
758c442c | 3981 | |
0929eaeb AC |
3982 | -- Check dimensions in N for formals with default expression |
3983 | ||
3984 | Analyze_Dimension_Formals (N, Formals); | |
3985 | ||
a38ff9b1 ES |
3986 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
3987 | -- inherited interface operation, and the controlling type is | |
3988 | -- a synchronized type, replace the type with its corresponding | |
3989 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
3990 | -- Same processing for an access parameter whose designated type is |
3991 | -- derived from a synchronized interface. | |
758c442c | 3992 | |
0791fbe9 | 3993 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
3994 | declare |
3995 | Formal : Entity_Id; | |
3996 | Formal_Typ : Entity_Id; | |
3997 | Rec_Typ : Entity_Id; | |
69cb258c | 3998 | Desig_Typ : Entity_Id; |
0a36105d | 3999 | |
d44202ba HK |
4000 | begin |
4001 | Formal := First_Formal (Designator); | |
4002 | while Present (Formal) loop | |
4003 | Formal_Typ := Etype (Formal); | |
0a36105d | 4004 | |
d44202ba HK |
4005 | if Is_Concurrent_Type (Formal_Typ) |
4006 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4007 | then | |
4008 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
4009 | ||
4010 | if Present (Interfaces (Rec_Typ)) then | |
4011 | Set_Etype (Formal, Rec_Typ); | |
4012 | end if; | |
69cb258c AC |
4013 | |
4014 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
4015 | Desig_Typ := Designated_Type (Formal_Typ); | |
4016 | ||
4017 | if Is_Concurrent_Type (Desig_Typ) | |
4018 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
4019 | then | |
4020 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
4021 | ||
4022 | if Present (Interfaces (Rec_Typ)) then | |
4023 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
4024 | end if; | |
4025 | end if; | |
d44202ba HK |
4026 | end if; |
4027 | ||
4028 | Next_Formal (Formal); | |
4029 | end loop; | |
4030 | end; | |
758c442c GD |
4031 | end if; |
4032 | ||
fbf5a39b | 4033 | End_Scope; |
82c80734 | 4034 | |
b66c3ff4 AC |
4035 | -- The subprogram scope is pushed and popped around the processing of |
4036 | -- the return type for consistency with call above to Process_Formals | |
4037 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
4038 | -- itype created for the return type will be associated with the proper | |
4039 | -- scope. | |
4040 | ||
82c80734 | 4041 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 4042 | Push_Scope (Designator); |
82c80734 | 4043 | Analyze_Return_Type (N); |
b66c3ff4 | 4044 | End_Scope; |
fbf5a39b AC |
4045 | end if; |
4046 | ||
e606088a AC |
4047 | -- Function case |
4048 | ||
fbf5a39b | 4049 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
4050 | |
4051 | -- Deal with operator symbol case | |
4052 | ||
fbf5a39b AC |
4053 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
4054 | Valid_Operator_Definition (Designator); | |
4055 | end if; | |
4056 | ||
4057 | May_Need_Actuals (Designator); | |
4058 | ||
fe63b1b1 ES |
4059 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
4060 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
4061 | -- declarations, where abstractness is inherited, and to subprogram |
4062 | -- bodies generated for stream operations, which become renamings as | |
4063 | -- bodies. | |
2bfb1b72 | 4064 | |
fe63b1b1 ES |
4065 | -- In case of primitives associated with abstract interface types |
4066 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 4067 | |
1adaea16 AC |
4068 | if not Nkind_In (Original_Node (Parent (N)), |
4069 | N_Subprogram_Renaming_Declaration, | |
4070 | N_Abstract_Subprogram_Declaration, | |
4071 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 4072 | then |
2e79de51 AC |
4073 | if Is_Abstract_Type (Etype (Designator)) |
4074 | and then not Is_Interface (Etype (Designator)) | |
4075 | then | |
4076 | Error_Msg_N | |
4077 | ("function that returns abstract type must be abstract", N); | |
4078 | ||
e606088a | 4079 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
4080 | -- access result whose designated type is abstract. |
4081 | ||
4082 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
4083 | and then | |
4084 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
4085 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 4086 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
4087 | then |
4088 | Error_Msg_N ("function whose access result designates " | |
4089 | & "abstract type must be abstract", N); | |
4090 | end if; | |
fbf5a39b AC |
4091 | end if; |
4092 | end if; | |
4093 | ||
4094 | return Designator; | |
4095 | end Analyze_Subprogram_Specification; | |
4096 | ||
996ae0b0 RK |
4097 | -------------------------- |
4098 | -- Build_Body_To_Inline -- | |
4099 | -------------------------- | |
4100 | ||
d05ef0ab | 4101 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id) is |
f937473f | 4102 | Decl : constant Node_Id := Unit_Declaration_Node (Subp); |
996ae0b0 RK |
4103 | Original_Body : Node_Id; |
4104 | Body_To_Analyze : Node_Id; | |
4105 | Max_Size : constant := 10; | |
4106 | Stat_Count : Integer := 0; | |
4107 | ||
4108 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
e895b435 | 4109 | -- Check for declarations that make inlining not worthwhile |
996ae0b0 RK |
4110 | |
4111 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
82c80734 RD |
4112 | -- Check for statements that make inlining not worthwhile: any tasking |
4113 | -- statement, nested at any level. Keep track of total number of | |
4114 | -- elementary statements, as a measure of acceptable size. | |
996ae0b0 RK |
4115 | |
4116 | function Has_Pending_Instantiation return Boolean; | |
f937473f RD |
4117 | -- If some enclosing body contains instantiations that appear before the |
4118 | -- corresponding generic body, the enclosing body has a freeze node so | |
4119 | -- that it can be elaborated after the generic itself. This might | |
996ae0b0 RK |
4120 | -- conflict with subsequent inlinings, so that it is unsafe to try to |
4121 | -- inline in such a case. | |
4122 | ||
c8ef728f | 4123 | function Has_Single_Return return Boolean; |
f937473f RD |
4124 | -- In general we cannot inline functions that return unconstrained type. |
4125 | -- However, we can handle such functions if all return statements return | |
4126 | -- a local variable that is the only declaration in the body of the | |
4127 | -- function. In that case the call can be replaced by that local | |
4128 | -- variable as is done for other inlined calls. | |
c8ef728f | 4129 | |
fbf5a39b | 4130 | procedure Remove_Pragmas; |
76a69663 ES |
4131 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal |
4132 | -- parameter has no meaning when the body is inlined and the formals | |
4133 | -- are rewritten. Remove it from body to inline. The analysis of the | |
4134 | -- non-inlined body will handle the pragma properly. | |
996ae0b0 | 4135 | |
e895b435 ES |
4136 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean; |
4137 | -- If the body of the subprogram includes a call that returns an | |
4138 | -- unconstrained type, the secondary stack is involved, and it | |
4139 | -- is not worth inlining. | |
4140 | ||
996ae0b0 RK |
4141 | ------------------------------ |
4142 | -- Has_Excluded_Declaration -- | |
4143 | ------------------------------ | |
4144 | ||
4145 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
4146 | D : Node_Id; | |
4147 | ||
fbf5a39b | 4148 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; |
82c80734 RD |
4149 | -- Nested subprograms make a given body ineligible for inlining, but |
4150 | -- we make an exception for instantiations of unchecked conversion. | |
4151 | -- The body has not been analyzed yet, so check the name, and verify | |
4152 | -- that the visible entity with that name is the predefined unit. | |
4153 | ||
4154 | ----------------------------- | |
4155 | -- Is_Unchecked_Conversion -- | |
4156 | ----------------------------- | |
fbf5a39b AC |
4157 | |
4158 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
82c80734 | 4159 | Id : constant Node_Id := Name (D); |
fbf5a39b AC |
4160 | Conv : Entity_Id; |
4161 | ||
4162 | begin | |
4163 | if Nkind (Id) = N_Identifier | |
4164 | and then Chars (Id) = Name_Unchecked_Conversion | |
4165 | then | |
4166 | Conv := Current_Entity (Id); | |
4167 | ||
800621e0 | 4168 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) |
fbf5a39b AC |
4169 | and then Chars (Selector_Name (Id)) = Name_Unchecked_Conversion |
4170 | then | |
4171 | Conv := Current_Entity (Selector_Name (Id)); | |
fbf5a39b AC |
4172 | else |
4173 | return False; | |
4174 | end if; | |
4175 | ||
758c442c GD |
4176 | return Present (Conv) |
4177 | and then Is_Predefined_File_Name | |
4178 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
fbf5a39b AC |
4179 | and then Is_Intrinsic_Subprogram (Conv); |
4180 | end Is_Unchecked_Conversion; | |
4181 | ||
4182 | -- Start of processing for Has_Excluded_Declaration | |
4183 | ||
996ae0b0 RK |
4184 | begin |
4185 | D := First (Decls); | |
996ae0b0 | 4186 | while Present (D) loop |
800621e0 RD |
4187 | if (Nkind (D) = N_Function_Instantiation |
4188 | and then not Is_Unchecked_Conversion (D)) | |
4189 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
4190 | N_Package_Declaration, | |
4191 | N_Package_Instantiation, | |
4192 | N_Subprogram_Body, | |
4193 | N_Procedure_Instantiation, | |
4194 | N_Task_Type_Declaration) | |
996ae0b0 RK |
4195 | then |
4196 | Cannot_Inline | |
fbf5a39b | 4197 | ("cannot inline & (non-allowed declaration)?", D, Subp); |
996ae0b0 RK |
4198 | return True; |
4199 | end if; | |
4200 | ||
4201 | Next (D); | |
4202 | end loop; | |
4203 | ||
4204 | return False; | |
996ae0b0 RK |
4205 | end Has_Excluded_Declaration; |
4206 | ||
4207 | ---------------------------- | |
4208 | -- Has_Excluded_Statement -- | |
4209 | ---------------------------- | |
4210 | ||
4211 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
4212 | S : Node_Id; | |
4213 | E : Node_Id; | |
4214 | ||
4215 | begin | |
4216 | S := First (Stats); | |
996ae0b0 RK |
4217 | while Present (S) loop |
4218 | Stat_Count := Stat_Count + 1; | |
4219 | ||
800621e0 RD |
4220 | if Nkind_In (S, N_Abort_Statement, |
4221 | N_Asynchronous_Select, | |
4222 | N_Conditional_Entry_Call, | |
4223 | N_Delay_Relative_Statement, | |
4224 | N_Delay_Until_Statement, | |
4225 | N_Selective_Accept, | |
4226 | N_Timed_Entry_Call) | |
996ae0b0 RK |
4227 | then |
4228 | Cannot_Inline | |
fbf5a39b | 4229 | ("cannot inline & (non-allowed statement)?", S, Subp); |
996ae0b0 RK |
4230 | return True; |
4231 | ||
4232 | elsif Nkind (S) = N_Block_Statement then | |
4233 | if Present (Declarations (S)) | |
4234 | and then Has_Excluded_Declaration (Declarations (S)) | |
4235 | then | |
4236 | return True; | |
4237 | ||
4238 | elsif Present (Handled_Statement_Sequence (S)) | |
4239 | and then | |
4240 | (Present | |
4241 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
4242 | or else | |
4243 | Has_Excluded_Statement | |
4244 | (Statements (Handled_Statement_Sequence (S)))) | |
4245 | then | |
4246 | return True; | |
4247 | end if; | |
4248 | ||
4249 | elsif Nkind (S) = N_Case_Statement then | |
4250 | E := First (Alternatives (S)); | |
996ae0b0 RK |
4251 | while Present (E) loop |
4252 | if Has_Excluded_Statement (Statements (E)) then | |
4253 | return True; | |
4254 | end if; | |
4255 | ||
4256 | Next (E); | |
4257 | end loop; | |
4258 | ||
4259 | elsif Nkind (S) = N_If_Statement then | |
4260 | if Has_Excluded_Statement (Then_Statements (S)) then | |
4261 | return True; | |
4262 | end if; | |
4263 | ||
4264 | if Present (Elsif_Parts (S)) then | |
4265 | E := First (Elsif_Parts (S)); | |
996ae0b0 RK |
4266 | while Present (E) loop |
4267 | if Has_Excluded_Statement (Then_Statements (E)) then | |
4268 | return True; | |
4269 | end if; | |
685bc70f | 4270 | |
996ae0b0 RK |
4271 | Next (E); |
4272 | end loop; | |
4273 | end if; | |
4274 | ||
4275 | if Present (Else_Statements (S)) | |
4276 | and then Has_Excluded_Statement (Else_Statements (S)) | |
4277 | then | |
4278 | return True; | |
4279 | end if; | |
4280 | ||
4281 | elsif Nkind (S) = N_Loop_Statement | |
4282 | and then Has_Excluded_Statement (Statements (S)) | |
4283 | then | |
4284 | return True; | |
3e2399ba AC |
4285 | |
4286 | elsif Nkind (S) = N_Extended_Return_Statement then | |
4287 | if Has_Excluded_Statement | |
4288 | (Statements (Handled_Statement_Sequence (S))) | |
4289 | or else Present | |
4290 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
4291 | then | |
4292 | return True; | |
4293 | end if; | |
996ae0b0 RK |
4294 | end if; |
4295 | ||
4296 | Next (S); | |
4297 | end loop; | |
4298 | ||
4299 | return False; | |
4300 | end Has_Excluded_Statement; | |
4301 | ||
4302 | ------------------------------- | |
4303 | -- Has_Pending_Instantiation -- | |
4304 | ------------------------------- | |
4305 | ||
4306 | function Has_Pending_Instantiation return Boolean is | |
ec4867fa | 4307 | S : Entity_Id; |
996ae0b0 RK |
4308 | |
4309 | begin | |
ec4867fa | 4310 | S := Current_Scope; |
996ae0b0 RK |
4311 | while Present (S) loop |
4312 | if Is_Compilation_Unit (S) | |
4313 | or else Is_Child_Unit (S) | |
4314 | then | |
4315 | return False; | |
bce79204 | 4316 | |
996ae0b0 RK |
4317 | elsif Ekind (S) = E_Package |
4318 | and then Has_Forward_Instantiation (S) | |
4319 | then | |
4320 | return True; | |
4321 | end if; | |
4322 | ||
4323 | S := Scope (S); | |
4324 | end loop; | |
4325 | ||
4326 | return False; | |
4327 | end Has_Pending_Instantiation; | |
4328 | ||
c8ef728f ES |
4329 | ------------------------ |
4330 | -- Has_Single_Return -- | |
4331 | ------------------------ | |
4332 | ||
4333 | function Has_Single_Return return Boolean is | |
4334 | Return_Statement : Node_Id := Empty; | |
4335 | ||
4336 | function Check_Return (N : Node_Id) return Traverse_Result; | |
4337 | ||
4338 | ------------------ | |
4339 | -- Check_Return -- | |
4340 | ------------------ | |
4341 | ||
4342 | function Check_Return (N : Node_Id) return Traverse_Result is | |
4343 | begin | |
5d37ba92 | 4344 | if Nkind (N) = N_Simple_Return_Statement then |
c8ef728f ES |
4345 | if Present (Expression (N)) |
4346 | and then Is_Entity_Name (Expression (N)) | |
4347 | then | |
4348 | if No (Return_Statement) then | |
4349 | Return_Statement := N; | |
4350 | return OK; | |
4351 | ||
4352 | elsif Chars (Expression (N)) = | |
4353 | Chars (Expression (Return_Statement)) | |
4354 | then | |
4355 | return OK; | |
4356 | ||
4357 | else | |
4358 | return Abandon; | |
4359 | end if; | |
4360 | ||
3e2399ba AC |
4361 | -- A return statement within an extended return is a noop |
4362 | -- after inlining. | |
4363 | ||
4364 | elsif No (Expression (N)) | |
4365 | and then Nkind (Parent (Parent (N))) = | |
8fde064e | 4366 | N_Extended_Return_Statement |
3e2399ba AC |
4367 | then |
4368 | return OK; | |
4369 | ||
c8ef728f ES |
4370 | else |
4371 | -- Expression has wrong form | |
4372 | ||
4373 | return Abandon; | |
4374 | end if; | |
4375 | ||
3e2399ba AC |
4376 | -- We can only inline a build-in-place function if |
4377 | -- it has a single extended return. | |
4378 | ||
4379 | elsif Nkind (N) = N_Extended_Return_Statement then | |
4380 | if No (Return_Statement) then | |
4381 | Return_Statement := N; | |
4382 | return OK; | |
4383 | ||
4384 | else | |
4385 | return Abandon; | |
4386 | end if; | |
4387 | ||
c8ef728f ES |
4388 | else |
4389 | return OK; | |
4390 | end if; | |
4391 | end Check_Return; | |
4392 | ||
4393 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
4394 | ||
4395 | -- Start of processing for Has_Single_Return | |
4396 | ||
4397 | begin | |
3e2399ba AC |
4398 | if Check_All_Returns (N) /= OK then |
4399 | return False; | |
4400 | ||
4401 | elsif Nkind (Return_Statement) = N_Extended_Return_Statement then | |
4402 | return True; | |
4403 | ||
4404 | else | |
4405 | return Present (Declarations (N)) | |
4406 | and then Present (First (Declarations (N))) | |
4407 | and then Chars (Expression (Return_Statement)) = | |
8fde064e | 4408 | Chars (Defining_Identifier (First (Declarations (N)))); |
3e2399ba | 4409 | end if; |
c8ef728f ES |
4410 | end Has_Single_Return; |
4411 | ||
fbf5a39b AC |
4412 | -------------------- |
4413 | -- Remove_Pragmas -- | |
4414 | -------------------- | |
4415 | ||
4416 | procedure Remove_Pragmas is | |
4417 | Decl : Node_Id; | |
4418 | Nxt : Node_Id; | |
4419 | ||
4420 | begin | |
4421 | Decl := First (Declarations (Body_To_Analyze)); | |
4422 | while Present (Decl) loop | |
4423 | Nxt := Next (Decl); | |
4424 | ||
4425 | if Nkind (Decl) = N_Pragma | |
b69cd36a AC |
4426 | and then Nam_In (Pragma_Name (Decl), Name_Unreferenced, |
4427 | Name_Unmodified) | |
fbf5a39b AC |
4428 | then |
4429 | Remove (Decl); | |
4430 | end if; | |
4431 | ||
4432 | Decl := Nxt; | |
4433 | end loop; | |
4434 | end Remove_Pragmas; | |
4435 | ||
e895b435 ES |
4436 | -------------------------- |
4437 | -- Uses_Secondary_Stack -- | |
4438 | -------------------------- | |
4439 | ||
4440 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean is | |
4441 | function Check_Call (N : Node_Id) return Traverse_Result; | |
4442 | -- Look for function calls that return an unconstrained type | |
4443 | ||
4444 | ---------------- | |
4445 | -- Check_Call -- | |
4446 | ---------------- | |
4447 | ||
4448 | function Check_Call (N : Node_Id) return Traverse_Result is | |
4449 | begin | |
4450 | if Nkind (N) = N_Function_Call | |
4451 | and then Is_Entity_Name (Name (N)) | |
4452 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
4453 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
4454 | then | |
4455 | Cannot_Inline | |
4456 | ("cannot inline & (call returns unconstrained type)?", | |
685bc70f | 4457 | N, Subp); |
e895b435 ES |
4458 | return Abandon; |
4459 | else | |
4460 | return OK; | |
4461 | end if; | |
4462 | end Check_Call; | |
4463 | ||
4464 | function Check_Calls is new Traverse_Func (Check_Call); | |
4465 | ||
4466 | begin | |
4467 | return Check_Calls (Bod) = Abandon; | |
4468 | end Uses_Secondary_Stack; | |
4469 | ||
996ae0b0 RK |
4470 | -- Start of processing for Build_Body_To_Inline |
4471 | ||
4472 | begin | |
8dbd1460 AC |
4473 | -- Return immediately if done already |
4474 | ||
996ae0b0 RK |
4475 | if Nkind (Decl) = N_Subprogram_Declaration |
4476 | and then Present (Body_To_Inline (Decl)) | |
4477 | then | |
8dbd1460 | 4478 | return; |
996ae0b0 | 4479 | |
08402a6d ES |
4480 | -- Functions that return unconstrained composite types require |
4481 | -- secondary stack handling, and cannot currently be inlined, unless | |
4482 | -- all return statements return a local variable that is the first | |
4483 | -- local declaration in the body. | |
996ae0b0 RK |
4484 | |
4485 | elsif Ekind (Subp) = E_Function | |
4486 | and then not Is_Scalar_Type (Etype (Subp)) | |
4487 | and then not Is_Access_Type (Etype (Subp)) | |
4488 | and then not Is_Constrained (Etype (Subp)) | |
4489 | then | |
08402a6d ES |
4490 | if not Has_Single_Return then |
4491 | Cannot_Inline | |
4492 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
4493 | return; | |
4494 | end if; | |
4495 | ||
4496 | -- Ditto for functions that return controlled types, where controlled | |
4497 | -- actions interfere in complex ways with inlining. | |
2820d220 AC |
4498 | |
4499 | elsif Ekind (Subp) = E_Function | |
048e5cef | 4500 | and then Needs_Finalization (Etype (Subp)) |
2820d220 AC |
4501 | then |
4502 | Cannot_Inline | |
4503 | ("cannot inline & (controlled return type)?", N, Subp); | |
4504 | return; | |
996ae0b0 RK |
4505 | end if; |
4506 | ||
d05ef0ab AC |
4507 | if Present (Declarations (N)) |
4508 | and then Has_Excluded_Declaration (Declarations (N)) | |
996ae0b0 | 4509 | then |
d05ef0ab | 4510 | return; |
996ae0b0 RK |
4511 | end if; |
4512 | ||
4513 | if Present (Handled_Statement_Sequence (N)) then | |
fbf5a39b AC |
4514 | if Present (Exception_Handlers (Handled_Statement_Sequence (N))) then |
4515 | Cannot_Inline | |
4516 | ("cannot inline& (exception handler)?", | |
4517 | First (Exception_Handlers (Handled_Statement_Sequence (N))), | |
4518 | Subp); | |
d05ef0ab | 4519 | return; |
996ae0b0 RK |
4520 | elsif |
4521 | Has_Excluded_Statement | |
4522 | (Statements (Handled_Statement_Sequence (N))) | |
4523 | then | |
d05ef0ab | 4524 | return; |
996ae0b0 RK |
4525 | end if; |
4526 | end if; | |
4527 | ||
4528 | -- We do not inline a subprogram that is too large, unless it is | |
4529 | -- marked Inline_Always. This pragma does not suppress the other | |
4530 | -- checks on inlining (forbidden declarations, handlers, etc). | |
4531 | ||
4532 | if Stat_Count > Max_Size | |
800621e0 | 4533 | and then not Has_Pragma_Inline_Always (Subp) |
996ae0b0 | 4534 | then |
fbf5a39b | 4535 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); |
d05ef0ab | 4536 | return; |
996ae0b0 RK |
4537 | end if; |
4538 | ||
4539 | if Has_Pending_Instantiation then | |
4540 | Cannot_Inline | |
fbf5a39b AC |
4541 | ("cannot inline& (forward instance within enclosing body)?", |
4542 | N, Subp); | |
d05ef0ab AC |
4543 | return; |
4544 | end if; | |
4545 | ||
4546 | -- Within an instance, the body to inline must be treated as a nested | |
4547 | -- generic, so that the proper global references are preserved. | |
4548 | ||
ce4e59c4 ST |
4549 | -- Note that we do not do this at the library level, because it is not |
4550 | -- needed, and furthermore this causes trouble if front end inlining | |
4551 | -- is activated (-gnatN). | |
4552 | ||
4553 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
4554 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); |
4555 | Original_Body := Copy_Generic_Node (N, Empty, True); | |
4556 | else | |
4557 | Original_Body := Copy_Separate_Tree (N); | |
996ae0b0 RK |
4558 | end if; |
4559 | ||
d05ef0ab AC |
4560 | -- We need to capture references to the formals in order to substitute |
4561 | -- the actuals at the point of inlining, i.e. instantiation. To treat | |
4562 | -- the formals as globals to the body to inline, we nest it within | |
4563 | -- a dummy parameterless subprogram, declared within the real one. | |
24105bab AC |
4564 | -- To avoid generating an internal name (which is never public, and |
4565 | -- which affects serial numbers of other generated names), we use | |
4566 | -- an internal symbol that cannot conflict with user declarations. | |
d05ef0ab AC |
4567 | |
4568 | Set_Parameter_Specifications (Specification (Original_Body), No_List); | |
24105bab AC |
4569 | Set_Defining_Unit_Name |
4570 | (Specification (Original_Body), | |
4571 | Make_Defining_Identifier (Sloc (N), Name_uParent)); | |
d05ef0ab AC |
4572 | Set_Corresponding_Spec (Original_Body, Empty); |
4573 | ||
996ae0b0 RK |
4574 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); |
4575 | ||
4576 | -- Set return type of function, which is also global and does not need | |
4577 | -- to be resolved. | |
4578 | ||
4579 | if Ekind (Subp) = E_Function then | |
41251c60 | 4580 | Set_Result_Definition (Specification (Body_To_Analyze), |
996ae0b0 RK |
4581 | New_Occurrence_Of (Etype (Subp), Sloc (N))); |
4582 | end if; | |
4583 | ||
4584 | if No (Declarations (N)) then | |
4585 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
4586 | else | |
4587 | Append (Body_To_Analyze, Declarations (N)); | |
4588 | end if; | |
4589 | ||
4590 | Expander_Mode_Save_And_Set (False); | |
fbf5a39b | 4591 | Remove_Pragmas; |
996ae0b0 RK |
4592 | |
4593 | Analyze (Body_To_Analyze); | |
0a36105d | 4594 | Push_Scope (Defining_Entity (Body_To_Analyze)); |
996ae0b0 RK |
4595 | Save_Global_References (Original_Body); |
4596 | End_Scope; | |
4597 | Remove (Body_To_Analyze); | |
4598 | ||
4599 | Expander_Mode_Restore; | |
d05ef0ab | 4600 | |
ce4e59c4 ST |
4601 | -- Restore environment if previously saved |
4602 | ||
4603 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
4604 | Restore_Env; |
4605 | end if; | |
e895b435 ES |
4606 | |
4607 | -- If secondary stk used there is no point in inlining. We have | |
4608 | -- already issued the warning in this case, so nothing to do. | |
4609 | ||
4610 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
4611 | return; | |
4612 | end if; | |
4613 | ||
4614 | Set_Body_To_Inline (Decl, Original_Body); | |
4615 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Subp)); | |
4616 | Set_Is_Inlined (Subp); | |
996ae0b0 RK |
4617 | end Build_Body_To_Inline; |
4618 | ||
fbf5a39b AC |
4619 | ------------------- |
4620 | -- Cannot_Inline -- | |
4621 | ------------------- | |
4622 | ||
84f4072a JM |
4623 | procedure Cannot_Inline |
4624 | (Msg : String; | |
4625 | N : Node_Id; | |
4626 | Subp : Entity_Id; | |
bde73c6b AC |
4627 | Is_Serious : Boolean := False) |
4628 | is | |
fbf5a39b | 4629 | begin |
84f4072a | 4630 | pragma Assert (Msg (Msg'Last) = '?'); |
fbf5a39b | 4631 | |
84f4072a JM |
4632 | -- Old semantics |
4633 | ||
4634 | if not Debug_Flag_Dot_K then | |
4635 | ||
4636 | -- Do not emit warning if this is a predefined unit which is not | |
4637 | -- the main unit. With validity checks enabled, some predefined | |
4638 | -- subprograms may contain nested subprograms and become ineligible | |
4639 | -- for inlining. | |
4640 | ||
4641 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
4642 | and then not In_Extended_Main_Source_Unit (Subp) | |
4643 | then | |
4644 | null; | |
4645 | ||
4646 | elsif Has_Pragma_Inline_Always (Subp) then | |
4647 | ||
4648 | -- Remove last character (question mark) to make this into an | |
4649 | -- error, because the Inline_Always pragma cannot be obeyed. | |
4650 | ||
4651 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); | |
4652 | ||
4653 | elsif Ineffective_Inline_Warnings then | |
dbfeb4fa | 4654 | Error_Msg_NE (Msg & "p?", N, Subp); |
84f4072a JM |
4655 | end if; |
4656 | ||
4657 | return; | |
fbf5a39b | 4658 | |
84f4072a | 4659 | -- New semantics |
e895b435 | 4660 | |
84f4072a JM |
4661 | elsif Is_Serious then |
4662 | ||
4663 | -- Remove last character (question mark) to make this into an error. | |
e895b435 | 4664 | |
ec4867fa | 4665 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); |
fbf5a39b | 4666 | |
84f4072a JM |
4667 | elsif Optimization_Level = 0 then |
4668 | ||
4669 | -- Do not emit warning if this is a predefined unit which is not | |
4670 | -- the main unit. This behavior is currently provided for backward | |
4671 | -- compatibility but it will be removed when we enforce the | |
4672 | -- strictness of the new rules. | |
4673 | ||
4674 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
4675 | and then not In_Extended_Main_Source_Unit (Subp) | |
4676 | then | |
4677 | null; | |
4678 | ||
4679 | elsif Has_Pragma_Inline_Always (Subp) then | |
4680 | ||
4681 | -- Emit a warning if this is a call to a runtime subprogram | |
4682 | -- which is located inside a generic. Previously this call | |
a90bd866 | 4683 | -- was silently skipped. |
84f4072a JM |
4684 | |
4685 | if Is_Generic_Instance (Subp) then | |
4686 | declare | |
4687 | Gen_P : constant Entity_Id := Generic_Parent (Parent (Subp)); | |
4688 | begin | |
4689 | if Is_Predefined_File_Name | |
4690 | (Unit_File_Name (Get_Source_Unit (Gen_P))) | |
4691 | then | |
4692 | Set_Is_Inlined (Subp, False); | |
dbfeb4fa | 4693 | Error_Msg_NE (Msg & "p?", N, Subp); |
84f4072a JM |
4694 | return; |
4695 | end if; | |
4696 | end; | |
4697 | end if; | |
4698 | ||
4699 | -- Remove last character (question mark) to make this into an | |
4700 | -- error, because the Inline_Always pragma cannot be obeyed. | |
4701 | ||
4702 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); | |
4703 | ||
4704 | else pragma Assert (Front_End_Inlining); | |
4705 | Set_Is_Inlined (Subp, False); | |
4706 | ||
4707 | -- When inlining cannot take place we must issue an error. | |
4708 | -- For backward compatibility we still report a warning. | |
4709 | ||
4710 | if Ineffective_Inline_Warnings then | |
dbfeb4fa | 4711 | Error_Msg_NE (Msg & "p?", N, Subp); |
84f4072a JM |
4712 | end if; |
4713 | end if; | |
4714 | ||
4715 | -- Compiling with optimizations enabled it is too early to report | |
4716 | -- problems since the backend may still perform inlining. In order | |
4717 | -- to report unhandled inlinings the program must be compiled with | |
4718 | -- -Winline and the error is reported by the backend. | |
4719 | ||
4720 | else | |
4721 | null; | |
fbf5a39b AC |
4722 | end if; |
4723 | end Cannot_Inline; | |
4724 | ||
84f4072a JM |
4725 | ------------------------------------ |
4726 | -- Check_And_Build_Body_To_Inline -- | |
4727 | ------------------------------------ | |
4728 | ||
4729 | procedure Check_And_Build_Body_To_Inline | |
4730 | (N : Node_Id; | |
4731 | Spec_Id : Entity_Id; | |
4732 | Body_Id : Entity_Id) | |
4733 | is | |
4734 | procedure Build_Body_To_Inline (N : Node_Id; Spec_Id : Entity_Id); | |
4735 | -- Use generic machinery to build an unexpanded body for the subprogram. | |
4736 | -- This body is subsequently used for inline expansions at call sites. | |
4737 | ||
4738 | function Can_Split_Unconstrained_Function (N : Node_Id) return Boolean; | |
088c2c8d AC |
4739 | -- Return true if we generate code for the function body N, the function |
4740 | -- body N has no local declarations and its unique statement is a single | |
4741 | -- extended return statement with a handled statements sequence. | |
84f4072a JM |
4742 | |
4743 | function Check_Body_To_Inline | |
4744 | (N : Node_Id; | |
4745 | Subp : Entity_Id) return Boolean; | |
4746 | -- N is the N_Subprogram_Body of Subp. Return true if Subp can be | |
4747 | -- inlined by the frontend. These are the rules: | |
4748 | -- * At -O0 use fe inlining when inline_always is specified except if | |
4749 | -- the function returns a controlled type. | |
4750 | -- * At other optimization levels use the fe inlining for both inline | |
4751 | -- and inline_always in the following cases: | |
4752 | -- - function returning a known at compile time constant | |
4753 | -- - function returning a call to an intrinsic function | |
4754 | -- - function returning an unconstrained type (see Can_Split | |
4755 | -- Unconstrained_Function). | |
4756 | -- - function returning a call to a frontend-inlined function | |
4757 | -- Use the back-end mechanism otherwise | |
4758 | -- | |
4759 | -- In addition, in the following cases the function cannot be inlined by | |
4760 | -- the frontend: | |
4761 | -- - functions that uses the secondary stack | |
4762 | -- - functions that have declarations of: | |
4763 | -- - Concurrent types | |
4764 | -- - Packages | |
4765 | -- - Instantiations | |
4766 | -- - Subprograms | |
4767 | -- - functions that have some of the following statements: | |
4768 | -- - abort | |
4769 | -- - asynchronous-select | |
4770 | -- - conditional-entry-call | |
4771 | -- - delay-relative | |
4772 | -- - delay-until | |
4773 | -- - selective-accept | |
4774 | -- - timed-entry-call | |
4775 | -- - functions that have exception handlers | |
4776 | -- - functions that have some enclosing body containing instantiations | |
4777 | -- that appear before the corresponding generic body. | |
4778 | ||
4779 | procedure Generate_Body_To_Inline | |
4780 | (N : Node_Id; | |
4781 | Body_To_Inline : out Node_Id); | |
4782 | -- Generate a parameterless duplicate of subprogram body N. Occurrences | |
4783 | -- of pragmas referencing the formals are removed since they have no | |
4784 | -- meaning when the body is inlined and the formals are rewritten (the | |
4785 | -- analysis of the non-inlined body will handle these pragmas properly). | |
4786 | -- A new internal name is associated with Body_To_Inline. | |
4787 | ||
84f4072a JM |
4788 | procedure Split_Unconstrained_Function |
4789 | (N : Node_Id; | |
4790 | Spec_Id : Entity_Id); | |
4791 | -- N is an inlined function body that returns an unconstrained type and | |
4792 | -- has a single extended return statement. Split N in two subprograms: | |
4793 | -- a procedure P' and a function F'. The formals of P' duplicate the | |
4794 | -- formals of N plus an extra formal which is used return a value; | |
4795 | -- its body is composed by the declarations and list of statements | |
4796 | -- of the extended return statement of N. | |
4797 | ||
4798 | -------------------------- | |
4799 | -- Build_Body_To_Inline -- | |
4800 | -------------------------- | |
4801 | ||
4802 | procedure Build_Body_To_Inline (N : Node_Id; Spec_Id : Entity_Id) is | |
4803 | Decl : constant Node_Id := Unit_Declaration_Node (Spec_Id); | |
4804 | Original_Body : Node_Id; | |
4805 | Body_To_Analyze : Node_Id; | |
4806 | ||
4807 | begin | |
4808 | pragma Assert (Current_Scope = Spec_Id); | |
4809 | ||
4810 | -- Within an instance, the body to inline must be treated as a nested | |
4811 | -- generic, so that the proper global references are preserved. We | |
4812 | -- do not do this at the library level, because it is not needed, and | |
4813 | -- furthermore this causes trouble if front end inlining is activated | |
4814 | -- (-gnatN). | |
4815 | ||
4816 | if In_Instance | |
4817 | and then Scope (Current_Scope) /= Standard_Standard | |
4818 | then | |
4819 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); | |
4820 | end if; | |
4821 | ||
4822 | -- We need to capture references to the formals in order | |
4823 | -- to substitute the actuals at the point of inlining, i.e. | |
4824 | -- instantiation. To treat the formals as globals to the body to | |
4825 | -- inline, we nest it within a dummy parameterless subprogram, | |
4826 | -- declared within the real one. | |
4827 | ||
4828 | Generate_Body_To_Inline (N, Original_Body); | |
4829 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); | |
4830 | ||
4831 | -- Set return type of function, which is also global and does not | |
4832 | -- need to be resolved. | |
4833 | ||
4834 | if Ekind (Spec_Id) = E_Function then | |
4835 | Set_Result_Definition (Specification (Body_To_Analyze), | |
4836 | New_Occurrence_Of (Etype (Spec_Id), Sloc (N))); | |
4837 | end if; | |
4838 | ||
4839 | if No (Declarations (N)) then | |
4840 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
4841 | else | |
4842 | Append_To (Declarations (N), Body_To_Analyze); | |
4843 | end if; | |
4844 | ||
4845 | Preanalyze (Body_To_Analyze); | |
4846 | ||
4847 | Push_Scope (Defining_Entity (Body_To_Analyze)); | |
4848 | Save_Global_References (Original_Body); | |
4849 | End_Scope; | |
4850 | Remove (Body_To_Analyze); | |
4851 | ||
4852 | -- Restore environment if previously saved | |
4853 | ||
4854 | if In_Instance | |
4855 | and then Scope (Current_Scope) /= Standard_Standard | |
4856 | then | |
4857 | Restore_Env; | |
4858 | end if; | |
4859 | ||
4860 | pragma Assert (No (Body_To_Inline (Decl))); | |
4861 | Set_Body_To_Inline (Decl, Original_Body); | |
4862 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Spec_Id)); | |
4863 | end Build_Body_To_Inline; | |
4864 | ||
4865 | -------------------------- | |
4866 | -- Check_Body_To_Inline -- | |
4867 | -------------------------- | |
4868 | ||
4869 | function Check_Body_To_Inline | |
4870 | (N : Node_Id; | |
4871 | Subp : Entity_Id) return Boolean | |
4872 | is | |
4873 | Max_Size : constant := 10; | |
4874 | Stat_Count : Integer := 0; | |
4875 | ||
4876 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
4877 | -- Check for declarations that make inlining not worthwhile | |
4878 | ||
4879 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
4880 | -- Check for statements that make inlining not worthwhile: any | |
4881 | -- tasking statement, nested at any level. Keep track of total | |
4882 | -- number of elementary statements, as a measure of acceptable size. | |
4883 | ||
4884 | function Has_Pending_Instantiation return Boolean; | |
4885 | -- Return True if some enclosing body contains instantiations that | |
4886 | -- appear before the corresponding generic body. | |
4887 | ||
4888 | function Returns_Compile_Time_Constant (N : Node_Id) return Boolean; | |
4889 | -- Return True if all the return statements of the function body N | |
4890 | -- are simple return statements and return a compile time constant | |
4891 | ||
4892 | function Returns_Intrinsic_Function_Call (N : Node_Id) return Boolean; | |
4893 | -- Return True if all the return statements of the function body N | |
4894 | -- are simple return statements and return an intrinsic function call | |
4895 | ||
4896 | function Uses_Secondary_Stack (N : Node_Id) return Boolean; | |
4897 | -- If the body of the subprogram includes a call that returns an | |
4898 | -- unconstrained type, the secondary stack is involved, and it | |
4899 | -- is not worth inlining. | |
4900 | ||
4901 | ------------------------------ | |
4902 | -- Has_Excluded_Declaration -- | |
4903 | ------------------------------ | |
4904 | ||
4905 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
4906 | D : Node_Id; | |
4907 | ||
4908 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; | |
4909 | -- Nested subprograms make a given body ineligible for inlining, | |
4910 | -- but we make an exception for instantiations of unchecked | |
4911 | -- conversion. The body has not been analyzed yet, so check the | |
4912 | -- name, and verify that the visible entity with that name is the | |
4913 | -- predefined unit. | |
4914 | ||
4915 | ----------------------------- | |
4916 | -- Is_Unchecked_Conversion -- | |
4917 | ----------------------------- | |
4918 | ||
4919 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
4920 | Id : constant Node_Id := Name (D); | |
4921 | Conv : Entity_Id; | |
4922 | ||
4923 | begin | |
4924 | if Nkind (Id) = N_Identifier | |
4925 | and then Chars (Id) = Name_Unchecked_Conversion | |
4926 | then | |
4927 | Conv := Current_Entity (Id); | |
4928 | ||
4929 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) | |
b69cd36a AC |
4930 | and then |
4931 | Chars (Selector_Name (Id)) = Name_Unchecked_Conversion | |
84f4072a JM |
4932 | then |
4933 | Conv := Current_Entity (Selector_Name (Id)); | |
4934 | else | |
4935 | return False; | |
4936 | end if; | |
4937 | ||
4938 | return Present (Conv) | |
4939 | and then Is_Predefined_File_Name | |
4940 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
4941 | and then Is_Intrinsic_Subprogram (Conv); | |
4942 | end Is_Unchecked_Conversion; | |
4943 | ||
4944 | -- Start of processing for Has_Excluded_Declaration | |
4945 | ||
4946 | begin | |
4947 | D := First (Decls); | |
4948 | while Present (D) loop | |
4949 | if (Nkind (D) = N_Function_Instantiation | |
4950 | and then not Is_Unchecked_Conversion (D)) | |
4951 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
4952 | N_Package_Declaration, | |
4953 | N_Package_Instantiation, | |
4954 | N_Subprogram_Body, | |
4955 | N_Procedure_Instantiation, | |
4956 | N_Task_Type_Declaration) | |
4957 | then | |
4958 | Cannot_Inline | |
4959 | ("cannot inline & (non-allowed declaration)?", D, Subp); | |
4960 | ||
4961 | return True; | |
4962 | end if; | |
4963 | ||
4964 | Next (D); | |
4965 | end loop; | |
4966 | ||
4967 | return False; | |
4968 | end Has_Excluded_Declaration; | |
4969 | ||
4970 | ---------------------------- | |
4971 | -- Has_Excluded_Statement -- | |
4972 | ---------------------------- | |
4973 | ||
4974 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
4975 | S : Node_Id; | |
4976 | E : Node_Id; | |
4977 | ||
4978 | begin | |
4979 | S := First (Stats); | |
4980 | while Present (S) loop | |
4981 | Stat_Count := Stat_Count + 1; | |
4982 | ||
4983 | if Nkind_In (S, N_Abort_Statement, | |
4984 | N_Asynchronous_Select, | |
4985 | N_Conditional_Entry_Call, | |
4986 | N_Delay_Relative_Statement, | |
4987 | N_Delay_Until_Statement, | |
4988 | N_Selective_Accept, | |
4989 | N_Timed_Entry_Call) | |
4990 | then | |
4991 | Cannot_Inline | |
4992 | ("cannot inline & (non-allowed statement)?", S, Subp); | |
4993 | return True; | |
4994 | ||
4995 | elsif Nkind (S) = N_Block_Statement then | |
4996 | if Present (Declarations (S)) | |
4997 | and then Has_Excluded_Declaration (Declarations (S)) | |
4998 | then | |
4999 | return True; | |
5000 | ||
5001 | elsif Present (Handled_Statement_Sequence (S)) then | |
5002 | if Present | |
5003 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
5004 | then | |
5005 | Cannot_Inline | |
5006 | ("cannot inline& (exception handler)?", | |
5007 | First (Exception_Handlers | |
5008 | (Handled_Statement_Sequence (S))), | |
5009 | Subp); | |
5010 | return True; | |
5011 | ||
5012 | elsif Has_Excluded_Statement | |
5013 | (Statements (Handled_Statement_Sequence (S))) | |
5014 | then | |
5015 | return True; | |
5016 | end if; | |
5017 | end if; | |
5018 | ||
5019 | elsif Nkind (S) = N_Case_Statement then | |
5020 | E := First (Alternatives (S)); | |
5021 | while Present (E) loop | |
5022 | if Has_Excluded_Statement (Statements (E)) then | |
5023 | return True; | |
5024 | end if; | |
5025 | ||
5026 | Next (E); | |
5027 | end loop; | |
5028 | ||
5029 | elsif Nkind (S) = N_If_Statement then | |
5030 | if Has_Excluded_Statement (Then_Statements (S)) then | |
5031 | return True; | |
5032 | end if; | |
5033 | ||
5034 | if Present (Elsif_Parts (S)) then | |
5035 | E := First (Elsif_Parts (S)); | |
5036 | while Present (E) loop | |
5037 | if Has_Excluded_Statement (Then_Statements (E)) then | |
5038 | return True; | |
5039 | end if; | |
5040 | Next (E); | |
5041 | end loop; | |
5042 | end if; | |
5043 | ||
5044 | if Present (Else_Statements (S)) | |
5045 | and then Has_Excluded_Statement (Else_Statements (S)) | |
5046 | then | |
5047 | return True; | |
5048 | end if; | |
5049 | ||
5050 | elsif Nkind (S) = N_Loop_Statement | |
5051 | and then Has_Excluded_Statement (Statements (S)) | |
5052 | then | |
5053 | return True; | |
5054 | ||
5055 | elsif Nkind (S) = N_Extended_Return_Statement then | |
5056 | if Present (Handled_Statement_Sequence (S)) | |
5057 | and then | |
5058 | Has_Excluded_Statement | |
5059 | (Statements (Handled_Statement_Sequence (S))) | |
5060 | then | |
5061 | return True; | |
5062 | ||
5063 | elsif Present (Handled_Statement_Sequence (S)) | |
5064 | and then | |
5065 | Present (Exception_Handlers | |
5066 | (Handled_Statement_Sequence (S))) | |
5067 | then | |
5068 | Cannot_Inline | |
5069 | ("cannot inline& (exception handler)?", | |
5070 | First (Exception_Handlers | |
5071 | (Handled_Statement_Sequence (S))), | |
5072 | Subp); | |
5073 | return True; | |
5074 | end if; | |
5075 | end if; | |
5076 | ||
5077 | Next (S); | |
5078 | end loop; | |
5079 | ||
5080 | return False; | |
5081 | end Has_Excluded_Statement; | |
5082 | ||
5083 | ------------------------------- | |
5084 | -- Has_Pending_Instantiation -- | |
5085 | ------------------------------- | |
5086 | ||
5087 | function Has_Pending_Instantiation return Boolean is | |
5088 | S : Entity_Id; | |
5089 | ||
5090 | begin | |
5091 | S := Current_Scope; | |
5092 | while Present (S) loop | |
5093 | if Is_Compilation_Unit (S) | |
5094 | or else Is_Child_Unit (S) | |
5095 | then | |
5096 | return False; | |
5097 | ||
5098 | elsif Ekind (S) = E_Package | |
5099 | and then Has_Forward_Instantiation (S) | |
5100 | then | |
5101 | return True; | |
5102 | end if; | |
5103 | ||
5104 | S := Scope (S); | |
5105 | end loop; | |
5106 | ||
5107 | return False; | |
5108 | end Has_Pending_Instantiation; | |
5109 | ||
5110 | ------------------------------------ | |
5111 | -- Returns_Compile_Time_Constant -- | |
5112 | ------------------------------------ | |
5113 | ||
5114 | function Returns_Compile_Time_Constant (N : Node_Id) return Boolean is | |
5115 | ||
5116 | function Check_Return (N : Node_Id) return Traverse_Result; | |
5117 | ||
5118 | ------------------ | |
5119 | -- Check_Return -- | |
5120 | ------------------ | |
5121 | ||
5122 | function Check_Return (N : Node_Id) return Traverse_Result is | |
5123 | begin | |
5124 | if Nkind (N) = N_Extended_Return_Statement then | |
5125 | return Abandon; | |
5126 | ||
5127 | elsif Nkind (N) = N_Simple_Return_Statement then | |
5128 | if Present (Expression (N)) then | |
5129 | declare | |
5130 | Orig_Expr : constant Node_Id := | |
5131 | Original_Node (Expression (N)); | |
5132 | ||
5133 | begin | |
5134 | if Nkind_In (Orig_Expr, N_Integer_Literal, | |
5135 | N_Real_Literal, | |
5136 | N_Character_Literal) | |
5137 | then | |
5138 | return OK; | |
5139 | ||
5140 | elsif Is_Entity_Name (Orig_Expr) | |
5141 | and then Ekind (Entity (Orig_Expr)) = E_Constant | |
5142 | and then Is_Static_Expression (Orig_Expr) | |
5143 | then | |
5144 | return OK; | |
5145 | else | |
5146 | return Abandon; | |
5147 | end if; | |
5148 | end; | |
5149 | ||
5150 | -- Expression has wrong form | |
5151 | ||
5152 | else | |
5153 | return Abandon; | |
5154 | end if; | |
5155 | ||
5156 | -- Continue analyzing statements | |
5157 | ||
5158 | else | |
5159 | return OK; | |
5160 | end if; | |
5161 | end Check_Return; | |
5162 | ||
5163 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
5164 | ||
5165 | -- Start of processing for Returns_Compile_Time_Constant | |
5166 | ||
5167 | begin | |
5168 | return Check_All_Returns (N) = OK; | |
5169 | end Returns_Compile_Time_Constant; | |
5170 | ||
5171 | -------------------------------------- | |
5172 | -- Returns_Intrinsic_Function_Call -- | |
5173 | -------------------------------------- | |
5174 | ||
5175 | function Returns_Intrinsic_Function_Call | |
5176 | (N : Node_Id) return Boolean | |
5177 | is | |
5178 | function Check_Return (N : Node_Id) return Traverse_Result; | |
5179 | ||
5180 | ------------------ | |
5181 | -- Check_Return -- | |
5182 | ------------------ | |
5183 | ||
5184 | function Check_Return (N : Node_Id) return Traverse_Result is | |
5185 | begin | |
5186 | if Nkind (N) = N_Extended_Return_Statement then | |
5187 | return Abandon; | |
5188 | ||
5189 | elsif Nkind (N) = N_Simple_Return_Statement then | |
5190 | if Present (Expression (N)) then | |
5191 | declare | |
5192 | Orig_Expr : constant Node_Id := | |
5193 | Original_Node (Expression (N)); | |
5194 | ||
5195 | begin | |
5196 | if Nkind (Orig_Expr) in N_Op | |
5197 | and then Is_Intrinsic_Subprogram (Entity (Orig_Expr)) | |
5198 | then | |
5199 | return OK; | |
5200 | ||
5201 | elsif Nkind (Orig_Expr) in N_Has_Entity | |
5202 | and then Present (Entity (Orig_Expr)) | |
5203 | and then Ekind (Entity (Orig_Expr)) = E_Function | |
5204 | and then Is_Inlined (Entity (Orig_Expr)) | |
5205 | then | |
5206 | return OK; | |
5207 | ||
5208 | elsif Nkind (Orig_Expr) in N_Has_Entity | |
5209 | and then Present (Entity (Orig_Expr)) | |
5210 | and then Is_Intrinsic_Subprogram (Entity (Orig_Expr)) | |
5211 | then | |
5212 | return OK; | |
5213 | ||
5214 | else | |
5215 | return Abandon; | |
5216 | end if; | |
5217 | end; | |
5218 | ||
5219 | -- Expression has wrong form | |
5220 | ||
5221 | else | |
5222 | return Abandon; | |
5223 | end if; | |
5224 | ||
5225 | -- Continue analyzing statements | |
5226 | ||
5227 | else | |
5228 | return OK; | |
5229 | end if; | |
5230 | end Check_Return; | |
5231 | ||
5232 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
5233 | ||
5234 | -- Start of processing for Returns_Intrinsic_Function_Call | |
5235 | ||
5236 | begin | |
5237 | return Check_All_Returns (N) = OK; | |
5238 | end Returns_Intrinsic_Function_Call; | |
5239 | ||
5240 | -------------------------- | |
5241 | -- Uses_Secondary_Stack -- | |
5242 | -------------------------- | |
5243 | ||
5244 | function Uses_Secondary_Stack (N : Node_Id) return Boolean is | |
5245 | ||
5246 | function Check_Call (N : Node_Id) return Traverse_Result; | |
5247 | -- Look for function calls that return an unconstrained type | |
5248 | ||
5249 | ---------------- | |
5250 | -- Check_Call -- | |
5251 | ---------------- | |
5252 | ||
5253 | function Check_Call (N : Node_Id) return Traverse_Result is | |
5254 | begin | |
5255 | if Nkind (N) = N_Function_Call | |
5256 | and then Is_Entity_Name (Name (N)) | |
5257 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
5258 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
5259 | then | |
5260 | Cannot_Inline | |
5261 | ("cannot inline & (call returns unconstrained type)?", | |
5262 | N, Subp); | |
5263 | ||
5264 | return Abandon; | |
5265 | else | |
5266 | return OK; | |
5267 | end if; | |
5268 | end Check_Call; | |
5269 | ||
5270 | function Check_Calls is new Traverse_Func (Check_Call); | |
5271 | ||
5272 | -- Start of processing for Uses_Secondary_Stack | |
5273 | ||
5274 | begin | |
5275 | return Check_Calls (N) = Abandon; | |
5276 | end Uses_Secondary_Stack; | |
5277 | ||
5278 | -- Local variables | |
5279 | ||
5280 | Decl : constant Node_Id := Unit_Declaration_Node (Spec_Id); | |
5281 | May_Inline : constant Boolean := | |
5282 | Has_Pragma_Inline_Always (Spec_Id) | |
5283 | or else (Has_Pragma_Inline (Spec_Id) | |
8fde064e AC |
5284 | and then ((Optimization_Level > 0 |
5285 | and then Ekind (Spec_Id) | |
84f4072a JM |
5286 | = E_Function) |
5287 | or else Front_End_Inlining)); | |
5288 | Body_To_Analyze : Node_Id; | |
5289 | ||
5290 | -- Start of processing for Check_Body_To_Inline | |
5291 | ||
5292 | begin | |
5293 | -- No action needed in stubs since the attribute Body_To_Inline | |
5294 | -- is not available | |
5295 | ||
5296 | if Nkind (Decl) = N_Subprogram_Body_Stub then | |
5297 | return False; | |
5298 | ||
5299 | -- Cannot build the body to inline if the attribute is already set. | |
5300 | -- This attribute may have been set if this is a subprogram renaming | |
5301 | -- declarations (see Freeze.Build_Renamed_Body). | |
5302 | ||
5303 | elsif Present (Body_To_Inline (Decl)) then | |
5304 | return False; | |
5305 | ||
5306 | -- No action needed if the subprogram does not fulfill the minimum | |
5307 | -- conditions to be inlined by the frontend | |
5308 | ||
5309 | elsif not May_Inline then | |
5310 | return False; | |
5311 | end if; | |
5312 | ||
5313 | -- Check excluded declarations | |
5314 | ||
5315 | if Present (Declarations (N)) | |
5316 | and then Has_Excluded_Declaration (Declarations (N)) | |
5317 | then | |
5318 | return False; | |
5319 | end if; | |
5320 | ||
5321 | -- Check excluded statements | |
5322 | ||
5323 | if Present (Handled_Statement_Sequence (N)) then | |
5324 | if Present | |
5325 | (Exception_Handlers (Handled_Statement_Sequence (N))) | |
5326 | then | |
5327 | Cannot_Inline | |
5328 | ("cannot inline& (exception handler)?", | |
5329 | First | |
5330 | (Exception_Handlers (Handled_Statement_Sequence (N))), | |
5331 | Subp); | |
5332 | ||
5333 | return False; | |
5334 | ||
5335 | elsif Has_Excluded_Statement | |
5336 | (Statements (Handled_Statement_Sequence (N))) | |
5337 | then | |
5338 | return False; | |
5339 | end if; | |
5340 | end if; | |
5341 | ||
5342 | -- For backward compatibility, compiling under -gnatN we do not | |
5343 | -- inline a subprogram that is too large, unless it is marked | |
5344 | -- Inline_Always. This pragma does not suppress the other checks | |
5345 | -- on inlining (forbidden declarations, handlers, etc). | |
5346 | ||
5347 | if Front_End_Inlining | |
5348 | and then not Has_Pragma_Inline_Always (Subp) | |
5349 | and then Stat_Count > Max_Size | |
5350 | then | |
5351 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); | |
5352 | return False; | |
5353 | end if; | |
5354 | ||
5355 | -- If some enclosing body contains instantiations that appear before | |
5356 | -- the corresponding generic body, the enclosing body has a freeze | |
5357 | -- node so that it can be elaborated after the generic itself. This | |
5358 | -- might conflict with subsequent inlinings, so that it is unsafe to | |
5359 | -- try to inline in such a case. | |
5360 | ||
5361 | if Has_Pending_Instantiation then | |
5362 | Cannot_Inline | |
5363 | ("cannot inline& (forward instance within enclosing body)?", | |
5364 | N, Subp); | |
5365 | ||
5366 | return False; | |
5367 | end if; | |
5368 | ||
5369 | -- Generate and preanalyze the body to inline (needed to perform | |
5370 | -- the rest of the checks) | |
5371 | ||
5372 | Generate_Body_To_Inline (N, Body_To_Analyze); | |
5373 | ||
5374 | if Ekind (Subp) = E_Function then | |
5375 | Set_Result_Definition (Specification (Body_To_Analyze), | |
5376 | New_Occurrence_Of (Etype (Subp), Sloc (N))); | |
5377 | end if; | |
5378 | ||
5379 | -- Nest the body to analyze within the real one | |
5380 | ||
5381 | if No (Declarations (N)) then | |
5382 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
5383 | else | |
5384 | Append_To (Declarations (N), Body_To_Analyze); | |
5385 | end if; | |
5386 | ||
5387 | Preanalyze (Body_To_Analyze); | |
5388 | Remove (Body_To_Analyze); | |
5389 | ||
5390 | -- Keep separate checks needed when compiling without optimizations | |
5391 | ||
ea3a4ad0 | 5392 | if Optimization_Level = 0 |
a1fc903a AC |
5393 | |
5394 | -- AAMP and VM targets have no support for inlining in the backend | |
5395 | -- and hence we use frontend inlining at all optimization levels. | |
5396 | ||
ea3a4ad0 JM |
5397 | or else AAMP_On_Target |
5398 | or else VM_Target /= No_VM | |
5399 | then | |
84f4072a JM |
5400 | -- Cannot inline functions whose body has a call that returns an |
5401 | -- unconstrained type since the secondary stack is involved, and | |
5402 | -- it is not worth inlining. | |
5403 | ||
5404 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
5405 | return False; | |
5406 | ||
5407 | -- Cannot inline functions that return controlled types since | |
5408 | -- controlled actions interfere in complex ways with inlining. | |
5409 | ||
5410 | elsif Ekind (Subp) = E_Function | |
5411 | and then Needs_Finalization (Etype (Subp)) | |
5412 | then | |
5413 | Cannot_Inline | |
5414 | ("cannot inline & (controlled return type)?", N, Subp); | |
5415 | return False; | |
5416 | ||
5417 | elsif Returns_Unconstrained_Type (Subp) then | |
5418 | Cannot_Inline | |
5419 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
5420 | return False; | |
5421 | end if; | |
5422 | ||
5423 | -- Compiling with optimizations enabled | |
5424 | ||
5425 | else | |
a90bd866 | 5426 | -- Procedures are never frontend inlined in this case |
84f4072a JM |
5427 | |
5428 | if Ekind (Subp) /= E_Function then | |
5429 | return False; | |
5430 | ||
5431 | -- Functions returning unconstrained types are tested | |
5432 | -- separately (see Can_Split_Unconstrained_Function). | |
5433 | ||
5434 | elsif Returns_Unconstrained_Type (Subp) then | |
5435 | null; | |
5436 | ||
5437 | -- Check supported cases | |
5438 | ||
5439 | elsif not Returns_Compile_Time_Constant (Body_To_Analyze) | |
5440 | and then Convention (Subp) /= Convention_Intrinsic | |
5441 | and then not Returns_Intrinsic_Function_Call (Body_To_Analyze) | |
5442 | then | |
5443 | return False; | |
5444 | end if; | |
5445 | end if; | |
5446 | ||
5447 | return True; | |
5448 | end Check_Body_To_Inline; | |
5449 | ||
5450 | -------------------------------------- | |
5451 | -- Can_Split_Unconstrained_Function -- | |
5452 | -------------------------------------- | |
5453 | ||
5454 | function Can_Split_Unconstrained_Function (N : Node_Id) return Boolean | |
5455 | is | |
5456 | Ret_Node : constant Node_Id := | |
5457 | First (Statements (Handled_Statement_Sequence (N))); | |
5458 | D : Node_Id; | |
5459 | ||
5460 | begin | |
5461 | -- No user defined declarations allowed in the function except inside | |
5462 | -- the unique return statement; implicit labels are the only allowed | |
5463 | -- declarations. | |
5464 | ||
5465 | if not Is_Empty_List (Declarations (N)) then | |
5466 | D := First (Declarations (N)); | |
5467 | while Present (D) loop | |
5468 | if Nkind (D) /= N_Implicit_Label_Declaration then | |
5469 | return False; | |
5470 | end if; | |
5471 | ||
5472 | Next (D); | |
5473 | end loop; | |
5474 | end if; | |
5475 | ||
088c2c8d AC |
5476 | -- We only split the inlined function when we are generating the code |
5477 | -- of its body; otherwise we leave duplicated split subprograms in | |
5478 | -- the tree which (if referenced) generate wrong references at link | |
5479 | -- time. | |
5480 | ||
5481 | return In_Extended_Main_Code_Unit (N) | |
5482 | and then Present (Ret_Node) | |
84f4072a JM |
5483 | and then Nkind (Ret_Node) = N_Extended_Return_Statement |
5484 | and then No (Next (Ret_Node)) | |
5485 | and then Present (Handled_Statement_Sequence (Ret_Node)); | |
5486 | end Can_Split_Unconstrained_Function; | |
5487 | ||
5488 | ----------------------------- | |
5489 | -- Generate_Body_To_Inline -- | |
5490 | ----------------------------- | |
5491 | ||
5492 | procedure Generate_Body_To_Inline | |
5493 | (N : Node_Id; | |
5494 | Body_To_Inline : out Node_Id) | |
5495 | is | |
5496 | procedure Remove_Pragmas (N : Node_Id); | |
5497 | -- Remove occurrences of pragmas that may reference the formals of | |
5498 | -- N. The analysis of the non-inlined body will handle these pragmas | |
5499 | -- properly. | |
5500 | ||
5501 | -------------------- | |
5502 | -- Remove_Pragmas -- | |
5503 | -------------------- | |
5504 | ||
5505 | procedure Remove_Pragmas (N : Node_Id) is | |
5506 | Decl : Node_Id; | |
5507 | Nxt : Node_Id; | |
5508 | ||
5509 | begin | |
5510 | Decl := First (Declarations (N)); | |
5511 | while Present (Decl) loop | |
5512 | Nxt := Next (Decl); | |
5513 | ||
5514 | if Nkind (Decl) = N_Pragma | |
b69cd36a AC |
5515 | and then Nam_In (Pragma_Name (Decl), Name_Unreferenced, |
5516 | Name_Unmodified) | |
84f4072a JM |
5517 | then |
5518 | Remove (Decl); | |
5519 | end if; | |
5520 | ||
5521 | Decl := Nxt; | |
5522 | end loop; | |
5523 | end Remove_Pragmas; | |
5524 | ||
5525 | -- Start of processing for Generate_Body_To_Inline | |
5526 | ||
5527 | begin | |
5528 | -- Within an instance, the body to inline must be treated as a nested | |
5529 | -- generic, so that the proper global references are preserved. | |
5530 | ||
5531 | -- Note that we do not do this at the library level, because it | |
5532 | -- is not needed, and furthermore this causes trouble if front | |
5533 | -- end inlining is activated (-gnatN). | |
5534 | ||
5535 | if In_Instance | |
5536 | and then Scope (Current_Scope) /= Standard_Standard | |
5537 | then | |
5538 | Body_To_Inline := Copy_Generic_Node (N, Empty, True); | |
5539 | else | |
5540 | Body_To_Inline := Copy_Separate_Tree (N); | |
5541 | end if; | |
5542 | ||
5543 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal | |
5544 | -- parameter has no meaning when the body is inlined and the formals | |
5545 | -- are rewritten. Remove it from body to inline. The analysis of the | |
5546 | -- non-inlined body will handle the pragma properly. | |
5547 | ||
5548 | Remove_Pragmas (Body_To_Inline); | |
5549 | ||
5550 | -- We need to capture references to the formals in order | |
5551 | -- to substitute the actuals at the point of inlining, i.e. | |
5552 | -- instantiation. To treat the formals as globals to the body to | |
5553 | -- inline, we nest it within a dummy parameterless subprogram, | |
5554 | -- declared within the real one. | |
5555 | ||
5556 | Set_Parameter_Specifications | |
5557 | (Specification (Body_To_Inline), No_List); | |
5558 | ||
5559 | -- A new internal name is associated with Body_To_Inline to avoid | |
5560 | -- conflicts when the non-inlined body N is analyzed. | |
5561 | ||
5562 | Set_Defining_Unit_Name (Specification (Body_To_Inline), | |
5563 | Make_Defining_Identifier (Sloc (N), New_Internal_Name ('P'))); | |
5564 | Set_Corresponding_Spec (Body_To_Inline, Empty); | |
5565 | end Generate_Body_To_Inline; | |
5566 | ||
84f4072a JM |
5567 | ---------------------------------- |
5568 | -- Split_Unconstrained_Function -- | |
5569 | ---------------------------------- | |
5570 | ||
5571 | procedure Split_Unconstrained_Function | |
5572 | (N : Node_Id; | |
5573 | Spec_Id : Entity_Id) | |
5574 | is | |
5575 | Loc : constant Source_Ptr := Sloc (N); | |
5576 | Ret_Node : constant Node_Id := | |
5577 | First (Statements (Handled_Statement_Sequence (N))); | |
5578 | Ret_Obj : constant Node_Id := | |
5579 | First (Return_Object_Declarations (Ret_Node)); | |
5580 | ||
5581 | procedure Build_Procedure | |
5582 | (Proc_Id : out Entity_Id; | |
5583 | Decl_List : out List_Id); | |
5584 | -- Build a procedure containing the statements found in the extended | |
5585 | -- return statement of the unconstrained function body N. | |
5586 | ||
5587 | procedure Build_Procedure | |
5588 | (Proc_Id : out Entity_Id; | |
5589 | Decl_List : out List_Id) | |
5590 | is | |
5591 | Formal : Entity_Id; | |
5592 | Formal_List : constant List_Id := New_List; | |
5593 | Proc_Spec : Node_Id; | |
5594 | Proc_Body : Node_Id; | |
5595 | Subp_Name : constant Name_Id := New_Internal_Name ('F'); | |
5596 | Body_Decl_List : List_Id := No_List; | |
5597 | Param_Type : Node_Id; | |
5598 | ||
5599 | begin | |
5600 | if Nkind (Object_Definition (Ret_Obj)) = N_Identifier then | |
5601 | Param_Type := New_Copy (Object_Definition (Ret_Obj)); | |
5602 | else | |
5603 | Param_Type := | |
5604 | New_Copy (Subtype_Mark (Object_Definition (Ret_Obj))); | |
5605 | end if; | |
5606 | ||
5607 | Append_To (Formal_List, | |
5608 | Make_Parameter_Specification (Loc, | |
5609 | Defining_Identifier => | |
5610 | Make_Defining_Identifier (Loc, | |
5611 | Chars => Chars (Defining_Identifier (Ret_Obj))), | |
5612 | In_Present => False, | |
5613 | Out_Present => True, | |
5614 | Null_Exclusion_Present => False, | |
5615 | Parameter_Type => Param_Type)); | |
5616 | ||
5617 | Formal := First_Formal (Spec_Id); | |
5618 | while Present (Formal) loop | |
5619 | Append_To (Formal_List, | |
5620 | Make_Parameter_Specification (Loc, | |
5621 | Defining_Identifier => | |
5622 | Make_Defining_Identifier (Sloc (Formal), | |
5623 | Chars => Chars (Formal)), | |
5624 | In_Present => In_Present (Parent (Formal)), | |
5625 | Out_Present => Out_Present (Parent (Formal)), | |
5626 | Null_Exclusion_Present => | |
5627 | Null_Exclusion_Present (Parent (Formal)), | |
5628 | Parameter_Type => | |
e4494292 | 5629 | New_Occurrence_Of (Etype (Formal), Loc), |
84f4072a JM |
5630 | Expression => |
5631 | Copy_Separate_Tree (Expression (Parent (Formal))))); | |
5632 | ||
5633 | Next_Formal (Formal); | |
5634 | end loop; | |
5635 | ||
5636 | Proc_Id := | |
5637 | Make_Defining_Identifier (Loc, Chars => Subp_Name); | |
5638 | ||
5639 | Proc_Spec := | |
5640 | Make_Procedure_Specification (Loc, | |
5641 | Defining_Unit_Name => Proc_Id, | |
5642 | Parameter_Specifications => Formal_List); | |
5643 | ||
5644 | Decl_List := New_List; | |
5645 | ||
5646 | Append_To (Decl_List, | |
5647 | Make_Subprogram_Declaration (Loc, Proc_Spec)); | |
5648 | ||
5649 | -- Can_Convert_Unconstrained_Function checked that the function | |
5650 | -- has no local declarations except implicit label declarations. | |
5651 | -- Copy these declarations to the built procedure. | |
5652 | ||
5653 | if Present (Declarations (N)) then | |
5654 | Body_Decl_List := New_List; | |
5655 | ||
5656 | declare | |
5657 | D : Node_Id; | |
5658 | New_D : Node_Id; | |
5659 | ||
5660 | begin | |
5661 | D := First (Declarations (N)); | |
5662 | while Present (D) loop | |
5663 | pragma Assert (Nkind (D) = N_Implicit_Label_Declaration); | |
5664 | ||
5665 | New_D := | |
5666 | Make_Implicit_Label_Declaration (Loc, | |
5667 | Make_Defining_Identifier (Loc, | |
5668 | Chars => Chars (Defining_Identifier (D))), | |
5669 | Label_Construct => Empty); | |
5670 | Append_To (Body_Decl_List, New_D); | |
5671 | ||
5672 | Next (D); | |
5673 | end loop; | |
5674 | end; | |
5675 | end if; | |
5676 | ||
5677 | pragma Assert (Present (Handled_Statement_Sequence (Ret_Node))); | |
5678 | ||
5679 | Proc_Body := | |
5680 | Make_Subprogram_Body (Loc, | |
5681 | Specification => Copy_Separate_Tree (Proc_Spec), | |
5682 | Declarations => Body_Decl_List, | |
5683 | Handled_Statement_Sequence => | |
5684 | Copy_Separate_Tree (Handled_Statement_Sequence (Ret_Node))); | |
5685 | ||
5686 | Set_Defining_Unit_Name (Specification (Proc_Body), | |
5687 | Make_Defining_Identifier (Loc, Subp_Name)); | |
5688 | ||
5689 | Append_To (Decl_List, Proc_Body); | |
5690 | end Build_Procedure; | |
5691 | ||
5692 | -- Local variables | |
5693 | ||
5694 | New_Obj : constant Node_Id := Copy_Separate_Tree (Ret_Obj); | |
5695 | Blk_Stmt : Node_Id; | |
5696 | Proc_Id : Entity_Id; | |
5697 | Proc_Call : Node_Id; | |
5698 | ||
5699 | -- Start of processing for Split_Unconstrained_Function | |
5700 | ||
5701 | begin | |
5702 | -- Build the associated procedure, analyze it and insert it before | |
5703 | -- the function body N | |
5704 | ||
5705 | declare | |
5706 | Scope : constant Entity_Id := Current_Scope; | |
5707 | Decl_List : List_Id; | |
5708 | begin | |
5709 | Pop_Scope; | |
5710 | Build_Procedure (Proc_Id, Decl_List); | |
5711 | Insert_Actions (N, Decl_List); | |
5712 | Push_Scope (Scope); | |
5713 | end; | |
5714 | ||
5715 | -- Build the call to the generated procedure | |
5716 | ||
5717 | declare | |
5718 | Actual_List : constant List_Id := New_List; | |
5719 | Formal : Entity_Id; | |
5720 | ||
5721 | begin | |
5722 | Append_To (Actual_List, | |
e4494292 | 5723 | New_Occurrence_Of (Defining_Identifier (New_Obj), Loc)); |
84f4072a JM |
5724 | |
5725 | Formal := First_Formal (Spec_Id); | |
5726 | while Present (Formal) loop | |
e4494292 | 5727 | Append_To (Actual_List, New_Occurrence_Of (Formal, Loc)); |
84f4072a JM |
5728 | |
5729 | -- Avoid spurious warning on unreferenced formals | |
5730 | ||
5731 | Set_Referenced (Formal); | |
5732 | Next_Formal (Formal); | |
5733 | end loop; | |
5734 | ||
5735 | Proc_Call := | |
5736 | Make_Procedure_Call_Statement (Loc, | |
e4494292 | 5737 | Name => New_Occurrence_Of (Proc_Id, Loc), |
84f4072a JM |
5738 | Parameter_Associations => Actual_List); |
5739 | end; | |
5740 | ||
5741 | -- Generate | |
5742 | ||
5743 | -- declare | |
5744 | -- New_Obj : ... | |
5745 | -- begin | |
5746 | -- main_1__F1b (New_Obj, ...); | |
5747 | -- return Obj; | |
5748 | -- end B10b; | |
5749 | ||
5750 | Blk_Stmt := | |
5751 | Make_Block_Statement (Loc, | |
5752 | Declarations => New_List (New_Obj), | |
5753 | Handled_Statement_Sequence => | |
5754 | Make_Handled_Sequence_Of_Statements (Loc, | |
5755 | Statements => New_List ( | |
5756 | ||
5757 | Proc_Call, | |
5758 | ||
5759 | Make_Simple_Return_Statement (Loc, | |
5760 | Expression => | |
e4494292 | 5761 | New_Occurrence_Of |
84f4072a JM |
5762 | (Defining_Identifier (New_Obj), Loc))))); |
5763 | ||
5764 | Rewrite (Ret_Node, Blk_Stmt); | |
5765 | end Split_Unconstrained_Function; | |
5766 | ||
5767 | -- Start of processing for Check_And_Build_Body_To_Inline | |
5768 | ||
5769 | begin | |
5770 | -- Do not inline any subprogram that contains nested subprograms, since | |
5771 | -- the backend inlining circuit seems to generate uninitialized | |
5772 | -- references in this case. We know this happens in the case of front | |
5773 | -- end ZCX support, but it also appears it can happen in other cases as | |
5774 | -- well. The backend often rejects attempts to inline in the case of | |
5775 | -- nested procedures anyway, so little if anything is lost by this. | |
5776 | -- Note that this is test is for the benefit of the back-end. There is | |
5777 | -- a separate test for front-end inlining that also rejects nested | |
5778 | -- subprograms. | |
5779 | ||
5780 | -- Do not do this test if errors have been detected, because in some | |
5781 | -- error cases, this code blows up, and we don't need it anyway if | |
5782 | -- there have been errors, since we won't get to the linker anyway. | |
5783 | ||
5784 | if Comes_From_Source (Body_Id) | |
5785 | and then (Has_Pragma_Inline_Always (Spec_Id) | |
5786 | or else Optimization_Level > 0) | |
5787 | and then Serious_Errors_Detected = 0 | |
5788 | then | |
5789 | declare | |
5790 | P_Ent : Node_Id; | |
5791 | ||
5792 | begin | |
5793 | P_Ent := Body_Id; | |
5794 | loop | |
5795 | P_Ent := Scope (P_Ent); | |
5796 | exit when No (P_Ent) or else P_Ent = Standard_Standard; | |
5797 | ||
5798 | if Is_Subprogram (P_Ent) then | |
5799 | Set_Is_Inlined (P_Ent, False); | |
5800 | ||
5801 | if Comes_From_Source (P_Ent) | |
5802 | and then Has_Pragma_Inline (P_Ent) | |
5803 | then | |
5804 | Cannot_Inline | |
5805 | ("cannot inline& (nested subprogram)?", N, P_Ent, | |
5806 | Is_Serious => True); | |
5807 | end if; | |
5808 | end if; | |
5809 | end loop; | |
5810 | end; | |
5811 | end if; | |
5812 | ||
a90bd866 | 5813 | -- Build the body to inline only if really needed |
84f4072a JM |
5814 | |
5815 | if Check_Body_To_Inline (N, Spec_Id) | |
5816 | and then Serious_Errors_Detected = 0 | |
5817 | then | |
5818 | if Returns_Unconstrained_Type (Spec_Id) then | |
5819 | if Can_Split_Unconstrained_Function (N) then | |
5820 | Split_Unconstrained_Function (N, Spec_Id); | |
5821 | Build_Body_To_Inline (N, Spec_Id); | |
5822 | Set_Is_Inlined (Spec_Id); | |
5823 | end if; | |
5824 | else | |
5825 | Build_Body_To_Inline (N, Spec_Id); | |
5826 | Set_Is_Inlined (Spec_Id); | |
5827 | end if; | |
5828 | end if; | |
5829 | end Check_And_Build_Body_To_Inline; | |
5830 | ||
996ae0b0 RK |
5831 | ----------------------- |
5832 | -- Check_Conformance -- | |
5833 | ----------------------- | |
5834 | ||
5835 | procedure Check_Conformance | |
41251c60 JM |
5836 | (New_Id : Entity_Id; |
5837 | Old_Id : Entity_Id; | |
5838 | Ctype : Conformance_Type; | |
5839 | Errmsg : Boolean; | |
5840 | Conforms : out Boolean; | |
5841 | Err_Loc : Node_Id := Empty; | |
5842 | Get_Inst : Boolean := False; | |
5843 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 5844 | is |
996ae0b0 | 5845 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
5846 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
5847 | -- If Errmsg is True, then processing continues to post an error message | |
5848 | -- for conformance error on given node. Two messages are output. The | |
5849 | -- first message points to the previous declaration with a general "no | |
5850 | -- conformance" message. The second is the detailed reason, supplied as | |
5851 | -- Msg. The parameter N provide information for a possible & insertion | |
5852 | -- in the message, and also provides the location for posting the | |
5853 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
5854 | |
5855 | ----------------------- | |
5856 | -- Conformance_Error -- | |
5857 | ----------------------- | |
5858 | ||
5859 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
5860 | Enode : Node_Id; | |
5861 | ||
5862 | begin | |
5863 | Conforms := False; | |
5864 | ||
5865 | if Errmsg then | |
5866 | if No (Err_Loc) then | |
5867 | Enode := N; | |
5868 | else | |
5869 | Enode := Err_Loc; | |
5870 | end if; | |
5871 | ||
5872 | Error_Msg_Sloc := Sloc (Old_Id); | |
5873 | ||
5874 | case Ctype is | |
5875 | when Type_Conformant => | |
483c78cb | 5876 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
5877 | ("not type conformant with declaration#!", Enode); |
5878 | ||
5879 | when Mode_Conformant => | |
19590d70 | 5880 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5881 | Error_Msg_N |
19590d70 GD |
5882 | ("not mode conformant with operation inherited#!", |
5883 | Enode); | |
5884 | else | |
ed2233dc | 5885 | Error_Msg_N |
19590d70 GD |
5886 | ("not mode conformant with declaration#!", Enode); |
5887 | end if; | |
996ae0b0 RK |
5888 | |
5889 | when Subtype_Conformant => | |
19590d70 | 5890 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5891 | Error_Msg_N |
19590d70 GD |
5892 | ("not subtype conformant with operation inherited#!", |
5893 | Enode); | |
5894 | else | |
ed2233dc | 5895 | Error_Msg_N |
19590d70 GD |
5896 | ("not subtype conformant with declaration#!", Enode); |
5897 | end if; | |
996ae0b0 RK |
5898 | |
5899 | when Fully_Conformant => | |
19590d70 | 5900 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 5901 | Error_Msg_N -- CODEFIX |
19590d70 GD |
5902 | ("not fully conformant with operation inherited#!", |
5903 | Enode); | |
5904 | else | |
483c78cb | 5905 | Error_Msg_N -- CODEFIX |
19590d70 GD |
5906 | ("not fully conformant with declaration#!", Enode); |
5907 | end if; | |
996ae0b0 RK |
5908 | end case; |
5909 | ||
5910 | Error_Msg_NE (Msg, Enode, N); | |
5911 | end if; | |
5912 | end Conformance_Error; | |
5913 | ||
ec4867fa ES |
5914 | -- Local Variables |
5915 | ||
5916 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
5917 | New_Type : constant Entity_Id := Etype (New_Id); | |
5918 | Old_Formal : Entity_Id; | |
5919 | New_Formal : Entity_Id; | |
5920 | Access_Types_Match : Boolean; | |
5921 | Old_Formal_Base : Entity_Id; | |
5922 | New_Formal_Base : Entity_Id; | |
5923 | ||
996ae0b0 RK |
5924 | -- Start of processing for Check_Conformance |
5925 | ||
5926 | begin | |
5927 | Conforms := True; | |
5928 | ||
82c80734 RD |
5929 | -- We need a special case for operators, since they don't appear |
5930 | -- explicitly. | |
996ae0b0 RK |
5931 | |
5932 | if Ctype = Type_Conformant then | |
5933 | if Ekind (New_Id) = E_Operator | |
5934 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
5935 | then | |
5936 | return; | |
5937 | end if; | |
5938 | end if; | |
5939 | ||
5940 | -- If both are functions/operators, check return types conform | |
5941 | ||
5942 | if Old_Type /= Standard_Void_Type | |
5943 | and then New_Type /= Standard_Void_Type | |
5944 | then | |
fceeaab6 ES |
5945 | |
5946 | -- If we are checking interface conformance we omit controlling | |
5947 | -- arguments and result, because we are only checking the conformance | |
5948 | -- of the remaining parameters. | |
5949 | ||
5950 | if Has_Controlling_Result (Old_Id) | |
5951 | and then Has_Controlling_Result (New_Id) | |
5952 | and then Skip_Controlling_Formals | |
5953 | then | |
5954 | null; | |
5955 | ||
5956 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
7f568bfa AC |
5957 | if Ctype >= Subtype_Conformant |
5958 | and then not Predicates_Match (Old_Type, New_Type) | |
5959 | then | |
5960 | Conformance_Error | |
5961 | ("\predicate of return type does not match!", New_Id); | |
5962 | else | |
5963 | Conformance_Error | |
5964 | ("\return type does not match!", New_Id); | |
5965 | end if; | |
5966 | ||
996ae0b0 RK |
5967 | return; |
5968 | end if; | |
5969 | ||
41251c60 | 5970 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 5971 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 5972 | |
0791fbe9 | 5973 | if Ada_Version >= Ada_2005 |
41251c60 JM |
5974 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
5975 | and then | |
8fde064e AC |
5976 | (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
5977 | or else Is_Access_Constant (Etype (Old_Type)) /= | |
5978 | Is_Access_Constant (Etype (New_Type))) | |
41251c60 | 5979 | then |
5d37ba92 | 5980 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
5981 | return; |
5982 | end if; | |
5983 | ||
996ae0b0 RK |
5984 | -- If either is a function/operator and the other isn't, error |
5985 | ||
5986 | elsif Old_Type /= Standard_Void_Type | |
5987 | or else New_Type /= Standard_Void_Type | |
5988 | then | |
5d37ba92 | 5989 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
5990 | return; |
5991 | end if; | |
5992 | ||
0a36105d | 5993 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
5994 | -- If this is a renaming as body, refine error message to indicate that |
5995 | -- the conflict is with the original declaration. If the entity is not | |
5996 | -- frozen, the conventions don't have to match, the one of the renamed | |
5997 | -- entity is inherited. | |
5998 | ||
5999 | if Ctype >= Subtype_Conformant then | |
996ae0b0 | 6000 | if Convention (Old_Id) /= Convention (New_Id) then |
996ae0b0 RK |
6001 | if not Is_Frozen (New_Id) then |
6002 | null; | |
6003 | ||
6004 | elsif Present (Err_Loc) | |
6005 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
6006 | and then Present (Corresponding_Spec (Err_Loc)) | |
6007 | then | |
6008 | Error_Msg_Name_1 := Chars (New_Id); | |
6009 | Error_Msg_Name_2 := | |
6010 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 6011 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
6012 | |
6013 | else | |
5d37ba92 | 6014 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
6015 | end if; |
6016 | ||
6017 | return; | |
6018 | ||
6019 | elsif Is_Formal_Subprogram (Old_Id) | |
6020 | or else Is_Formal_Subprogram (New_Id) | |
6021 | then | |
5d37ba92 | 6022 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 RK |
6023 | return; |
6024 | end if; | |
6025 | end if; | |
6026 | ||
6027 | -- Deal with parameters | |
6028 | ||
6029 | -- Note: we use the entity information, rather than going directly | |
6030 | -- to the specification in the tree. This is not only simpler, but | |
6031 | -- absolutely necessary for some cases of conformance tests between | |
a90bd866 | 6032 | -- operators, where the declaration tree simply does not exist. |
996ae0b0 RK |
6033 | |
6034 | Old_Formal := First_Formal (Old_Id); | |
6035 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 6036 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
6037 | if Is_Controlling_Formal (Old_Formal) |
6038 | and then Is_Controlling_Formal (New_Formal) | |
6039 | and then Skip_Controlling_Formals | |
6040 | then | |
a2dc5812 AC |
6041 | -- The controlling formals will have different types when |
6042 | -- comparing an interface operation with its match, but both | |
6043 | -- or neither must be access parameters. | |
6044 | ||
6045 | if Is_Access_Type (Etype (Old_Formal)) | |
6046 | = | |
6047 | Is_Access_Type (Etype (New_Formal)) | |
6048 | then | |
6049 | goto Skip_Controlling_Formal; | |
6050 | else | |
6051 | Conformance_Error | |
6052 | ("\access parameter does not match!", New_Formal); | |
6053 | end if; | |
41251c60 JM |
6054 | end if; |
6055 | ||
21791d97 | 6056 | -- Ada 2012: Mode conformance also requires that formal parameters |
2a290fec AC |
6057 | -- be both aliased, or neither. |
6058 | ||
21791d97 | 6059 | if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
2a290fec AC |
6060 | if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
6061 | Conformance_Error | |
6062 | ("\aliased parameter mismatch!", New_Formal); | |
6063 | end if; | |
6064 | end if; | |
6065 | ||
fbf5a39b AC |
6066 | if Ctype = Fully_Conformant then |
6067 | ||
6068 | -- Names must match. Error message is more accurate if we do | |
6069 | -- this before checking that the types of the formals match. | |
6070 | ||
6071 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
5d37ba92 | 6072 | Conformance_Error ("\name & does not match!", New_Formal); |
fbf5a39b AC |
6073 | |
6074 | -- Set error posted flag on new formal as well to stop | |
6075 | -- junk cascaded messages in some cases. | |
6076 | ||
6077 | Set_Error_Posted (New_Formal); | |
6078 | return; | |
6079 | end if; | |
40b93859 RD |
6080 | |
6081 | -- Null exclusion must match | |
6082 | ||
6083 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
6084 | /= | |
6085 | Null_Exclusion_Present (Parent (New_Formal)) | |
6086 | then | |
6087 | -- Only give error if both come from source. This should be | |
6088 | -- investigated some time, since it should not be needed ??? | |
6089 | ||
6090 | if Comes_From_Source (Old_Formal) | |
6091 | and then | |
6092 | Comes_From_Source (New_Formal) | |
6093 | then | |
6094 | Conformance_Error | |
6095 | ("\null exclusion for & does not match", New_Formal); | |
6096 | ||
6097 | -- Mark error posted on the new formal to avoid duplicated | |
6098 | -- complaint about types not matching. | |
6099 | ||
6100 | Set_Error_Posted (New_Formal); | |
6101 | end if; | |
6102 | end if; | |
fbf5a39b | 6103 | end if; |
996ae0b0 | 6104 | |
ec4867fa ES |
6105 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
6106 | -- case occurs whenever a subprogram is being renamed and one of its | |
6107 | -- parameters imposes a null exclusion. For example: | |
6108 | ||
6109 | -- type T is null record; | |
6110 | -- type Acc_T is access T; | |
6111 | -- subtype Acc_T_Sub is Acc_T; | |
6112 | ||
6113 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
6114 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
6115 | -- renames P; | |
6116 | ||
6117 | Old_Formal_Base := Etype (Old_Formal); | |
6118 | New_Formal_Base := Etype (New_Formal); | |
6119 | ||
6120 | if Get_Inst then | |
6121 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
6122 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
6123 | end if; | |
6124 | ||
0791fbe9 | 6125 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa | 6126 | |
8fde064e AC |
6127 | -- Ensure that this rule is only applied when New_Id is a |
6128 | -- renaming of Old_Id. | |
ec4867fa | 6129 | |
5d37ba92 ES |
6130 | and then Nkind (Parent (Parent (New_Id))) = |
6131 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
6132 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
6133 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
6134 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
6135 | ||
8fde064e | 6136 | -- Now handle the allowed access-type case |
ec4867fa ES |
6137 | |
6138 | and then Is_Access_Type (Old_Formal_Base) | |
6139 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 | 6140 | |
8fde064e AC |
6141 | -- The type kinds must match. The only exception occurs with |
6142 | -- multiple generics of the form: | |
5d37ba92 | 6143 | |
8fde064e AC |
6144 | -- generic generic |
6145 | -- type F is private; type A is private; | |
6146 | -- type F_Ptr is access F; type A_Ptr is access A; | |
6147 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
6148 | -- package F_Pack is ... package A_Pack is | |
6149 | -- package F_Inst is | |
6150 | -- new F_Pack (A, A_Ptr, A_P); | |
5d37ba92 | 6151 | |
8fde064e AC |
6152 | -- When checking for conformance between the parameters of A_P |
6153 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
6154 | -- because the compiler has transformed A_Ptr into a subtype of | |
6155 | -- F_Ptr. We catch this case in the code below. | |
5d37ba92 ES |
6156 | |
6157 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
6158 | or else | |
6159 | (Is_Generic_Type (Old_Formal_Base) | |
6160 | and then Is_Generic_Type (New_Formal_Base) | |
6161 | and then Is_Internal (New_Formal_Base) | |
6162 | and then Etype (Etype (New_Formal_Base)) = | |
6163 | Old_Formal_Base)) | |
ec4867fa | 6164 | and then Directly_Designated_Type (Old_Formal_Base) = |
8fde064e | 6165 | Directly_Designated_Type (New_Formal_Base) |
ec4867fa ES |
6166 | and then ((Is_Itype (Old_Formal_Base) |
6167 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
6168 | or else | |
6169 | (Is_Itype (New_Formal_Base) | |
6170 | and then Can_Never_Be_Null (New_Formal_Base))); | |
6171 | ||
996ae0b0 RK |
6172 | -- Types must always match. In the visible part of an instance, |
6173 | -- usual overloading rules for dispatching operations apply, and | |
6174 | -- we check base types (not the actual subtypes). | |
6175 | ||
6176 | if In_Instance_Visible_Part | |
6177 | and then Is_Dispatching_Operation (New_Id) | |
6178 | then | |
6179 | if not Conforming_Types | |
ec4867fa ES |
6180 | (T1 => Base_Type (Etype (Old_Formal)), |
6181 | T2 => Base_Type (Etype (New_Formal)), | |
6182 | Ctype => Ctype, | |
6183 | Get_Inst => Get_Inst) | |
6184 | and then not Access_Types_Match | |
996ae0b0 | 6185 | then |
5d37ba92 | 6186 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
6187 | return; |
6188 | end if; | |
6189 | ||
6190 | elsif not Conforming_Types | |
5d37ba92 ES |
6191 | (T1 => Old_Formal_Base, |
6192 | T2 => New_Formal_Base, | |
ec4867fa ES |
6193 | Ctype => Ctype, |
6194 | Get_Inst => Get_Inst) | |
6195 | and then not Access_Types_Match | |
996ae0b0 | 6196 | then |
c27f2f15 RD |
6197 | -- Don't give error message if old type is Any_Type. This test |
6198 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
6199 | ||
6200 | if Errmsg and then Old_Formal_Base = Any_Type then | |
6201 | Conforms := False; | |
6202 | else | |
7f568bfa AC |
6203 | if Ctype >= Subtype_Conformant |
6204 | and then | |
6205 | not Predicates_Match (Old_Formal_Base, New_Formal_Base) | |
6206 | then | |
6207 | Conformance_Error | |
6208 | ("\predicate of & does not match!", New_Formal); | |
6209 | else | |
6210 | Conformance_Error | |
6211 | ("\type of & does not match!", New_Formal); | |
6212 | end if; | |
c27f2f15 RD |
6213 | end if; |
6214 | ||
996ae0b0 RK |
6215 | return; |
6216 | end if; | |
6217 | ||
6218 | -- For mode conformance, mode must match | |
6219 | ||
5d37ba92 ES |
6220 | if Ctype >= Mode_Conformant then |
6221 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
6222 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
6223 | or else not Is_Primitive_Wrapper (New_Id) | |
6224 | then | |
6225 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 6226 | |
dd54644b JM |
6227 | else |
6228 | declare | |
c199ccf7 | 6229 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b JM |
6230 | begin |
6231 | if Is_Protected_Type | |
6232 | (Corresponding_Concurrent_Type (T)) | |
6233 | then | |
6234 | Error_Msg_PT (T, New_Id); | |
6235 | else | |
6236 | Conformance_Error | |
6237 | ("\mode of & does not match!", New_Formal); | |
6238 | end if; | |
6239 | end; | |
6240 | end if; | |
6241 | ||
5d37ba92 ES |
6242 | return; |
6243 | ||
6244 | -- Part of mode conformance for access types is having the same | |
6245 | -- constant modifier. | |
6246 | ||
6247 | elsif Access_Types_Match | |
6248 | and then Is_Access_Constant (Old_Formal_Base) /= | |
6249 | Is_Access_Constant (New_Formal_Base) | |
6250 | then | |
6251 | Conformance_Error | |
6252 | ("\constant modifier does not match!", New_Formal); | |
6253 | return; | |
6254 | end if; | |
996ae0b0 RK |
6255 | end if; |
6256 | ||
0a36105d | 6257 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 6258 | |
0a36105d JM |
6259 | -- Ada 2005 (AI-231): In case of anonymous access types check |
6260 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
6261 | -- match. For null exclusion, we test the types rather than the |
6262 | -- formals themselves, since the attribute is only set reliably | |
6263 | -- on the formals in the Ada 95 case, and we exclude the case | |
6264 | -- where Old_Formal is marked as controlling, to avoid errors | |
6265 | -- when matching completing bodies with dispatching declarations | |
6266 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 6267 | |
0791fbe9 | 6268 | if Ada_Version >= Ada_2005 |
0a36105d JM |
6269 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
6270 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
6271 | and then | |
c7b9d548 AC |
6272 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
6273 | Can_Never_Be_Null (Etype (New_Formal)) | |
6274 | and then | |
6275 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
6276 | or else |
6277 | Is_Access_Constant (Etype (Old_Formal)) /= | |
6278 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
6279 | |
6280 | -- Do not complain if error already posted on New_Formal. This | |
6281 | -- avoids some redundant error messages. | |
6282 | ||
6283 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
6284 | then |
6285 | -- It is allowed to omit the null-exclusion in case of stream | |
6286 | -- attribute subprograms. We recognize stream subprograms | |
6287 | -- through their TSS-generated suffix. | |
996ae0b0 | 6288 | |
0a36105d JM |
6289 | declare |
6290 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
3ada950b | 6291 | |
0a36105d JM |
6292 | begin |
6293 | if TSS_Name /= TSS_Stream_Read | |
6294 | and then TSS_Name /= TSS_Stream_Write | |
6295 | and then TSS_Name /= TSS_Stream_Input | |
6296 | and then TSS_Name /= TSS_Stream_Output | |
6297 | then | |
3ada950b | 6298 | -- Here we have a definite conformance error. It is worth |
71fb4dc8 | 6299 | -- special casing the error message for the case of a |
3ada950b AC |
6300 | -- controlling formal (which excludes null). |
6301 | ||
6302 | if Is_Controlling_Formal (New_Formal) then | |
6303 | Error_Msg_Node_2 := Scope (New_Formal); | |
6304 | Conformance_Error | |
6305 | ("\controlling formal& of& excludes null, " | |
6306 | & "declaration must exclude null as well", | |
6307 | New_Formal); | |
6308 | ||
6309 | -- Normal case (couldn't we give more detail here???) | |
6310 | ||
6311 | else | |
6312 | Conformance_Error | |
6313 | ("\type of & does not match!", New_Formal); | |
6314 | end if; | |
6315 | ||
0a36105d JM |
6316 | return; |
6317 | end if; | |
6318 | end; | |
6319 | end if; | |
6320 | end if; | |
41251c60 | 6321 | |
0a36105d | 6322 | -- Full conformance checks |
41251c60 | 6323 | |
0a36105d | 6324 | if Ctype = Fully_Conformant then |
e660dbf7 | 6325 | |
0a36105d | 6326 | -- We have checked already that names match |
e660dbf7 | 6327 | |
0a36105d | 6328 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
6329 | |
6330 | -- Check default expressions for in parameters | |
6331 | ||
996ae0b0 RK |
6332 | declare |
6333 | NewD : constant Boolean := | |
6334 | Present (Default_Value (New_Formal)); | |
6335 | OldD : constant Boolean := | |
6336 | Present (Default_Value (Old_Formal)); | |
6337 | begin | |
6338 | if NewD or OldD then | |
6339 | ||
82c80734 RD |
6340 | -- The old default value has been analyzed because the |
6341 | -- current full declaration will have frozen everything | |
0a36105d JM |
6342 | -- before. The new default value has not been analyzed, |
6343 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
6344 | |
6345 | if NewD then | |
0a36105d | 6346 | Push_Scope (New_Id); |
21d27997 | 6347 | Preanalyze_Spec_Expression |
fbf5a39b | 6348 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
6349 | End_Scope; |
6350 | end if; | |
6351 | ||
6352 | if not (NewD and OldD) | |
6353 | or else not Fully_Conformant_Expressions | |
6354 | (Default_Value (Old_Formal), | |
6355 | Default_Value (New_Formal)) | |
6356 | then | |
6357 | Conformance_Error | |
5d37ba92 | 6358 | ("\default expression for & does not match!", |
996ae0b0 RK |
6359 | New_Formal); |
6360 | return; | |
6361 | end if; | |
6362 | end if; | |
6363 | end; | |
6364 | end if; | |
6365 | end if; | |
6366 | ||
6367 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 6368 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
6369 | -- or if either old or new instance is not from the source program. |
6370 | ||
0ab80019 | 6371 | if Ada_Version = Ada_83 |
996ae0b0 RK |
6372 | and then Sloc (Old_Id) > Standard_Location |
6373 | and then Sloc (New_Id) > Standard_Location | |
6374 | and then Comes_From_Source (Old_Id) | |
6375 | and then Comes_From_Source (New_Id) | |
6376 | then | |
6377 | declare | |
6378 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
6379 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
6380 | ||
6381 | begin | |
6382 | -- Explicit IN must be present or absent in both cases. This | |
6383 | -- test is required only in the full conformance case. | |
6384 | ||
6385 | if In_Present (Old_Param) /= In_Present (New_Param) | |
6386 | and then Ctype = Fully_Conformant | |
6387 | then | |
6388 | Conformance_Error | |
5d37ba92 | 6389 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
6390 | New_Formal); |
6391 | return; | |
6392 | end if; | |
6393 | ||
6394 | -- Grouping (use of comma in param lists) must be the same | |
6395 | -- This is where we catch a misconformance like: | |
6396 | ||
0a36105d | 6397 | -- A, B : Integer |
996ae0b0 RK |
6398 | -- A : Integer; B : Integer |
6399 | ||
6400 | -- which are represented identically in the tree except | |
6401 | -- for the setting of the flags More_Ids and Prev_Ids. | |
6402 | ||
6403 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
6404 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
6405 | then | |
6406 | Conformance_Error | |
5d37ba92 | 6407 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
6408 | return; |
6409 | end if; | |
6410 | end; | |
6411 | end if; | |
6412 | ||
41251c60 JM |
6413 | -- This label is required when skipping controlling formals |
6414 | ||
6415 | <<Skip_Controlling_Formal>> | |
6416 | ||
996ae0b0 RK |
6417 | Next_Formal (Old_Formal); |
6418 | Next_Formal (New_Formal); | |
6419 | end loop; | |
6420 | ||
6421 | if Present (Old_Formal) then | |
5d37ba92 | 6422 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
6423 | return; |
6424 | ||
6425 | elsif Present (New_Formal) then | |
5d37ba92 | 6426 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
6427 | return; |
6428 | end if; | |
996ae0b0 RK |
6429 | end Check_Conformance; |
6430 | ||
ec4867fa ES |
6431 | ----------------------- |
6432 | -- Check_Conventions -- | |
6433 | ----------------------- | |
6434 | ||
6435 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 6436 | Ifaces_List : Elist_Id; |
0a36105d | 6437 | |
ce2b6ba5 | 6438 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
6439 | -- Verify that the convention of inherited dispatching operation Op is |
6440 | -- consistent among all subprograms it overrides. In order to minimize | |
6441 | -- the search, Search_From is utilized to designate a specific point in | |
6442 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
6443 | |
6444 | ---------------------- | |
6445 | -- Check_Convention -- | |
6446 | ---------------------- | |
6447 | ||
ce2b6ba5 | 6448 | procedure Check_Convention (Op : Entity_Id) is |
9f6aaa5c AC |
6449 | function Convention_Of (Id : Entity_Id) return Convention_Id; |
6450 | -- Given an entity, return its convention. The function treats Ghost | |
6451 | -- as convention Ada because the two have the same dynamic semantics. | |
6452 | ||
6453 | ------------------- | |
6454 | -- Convention_Of -- | |
6455 | ------------------- | |
6456 | ||
6457 | function Convention_Of (Id : Entity_Id) return Convention_Id is | |
6458 | Conv : constant Convention_Id := Convention (Id); | |
6459 | begin | |
6460 | if Conv = Convention_Ghost then | |
6461 | return Convention_Ada; | |
6462 | else | |
6463 | return Conv; | |
6464 | end if; | |
6465 | end Convention_Of; | |
6466 | ||
6467 | -- Local variables | |
6468 | ||
6469 | Op_Conv : constant Convention_Id := Convention_Of (Op); | |
6470 | Iface_Conv : Convention_Id; | |
ce2b6ba5 JM |
6471 | Iface_Elmt : Elmt_Id; |
6472 | Iface_Prim_Elmt : Elmt_Id; | |
6473 | Iface_Prim : Entity_Id; | |
ec4867fa | 6474 | |
9f6aaa5c AC |
6475 | -- Start of processing for Check_Convention |
6476 | ||
ce2b6ba5 JM |
6477 | begin |
6478 | Iface_Elmt := First_Elmt (Ifaces_List); | |
6479 | while Present (Iface_Elmt) loop | |
6480 | Iface_Prim_Elmt := | |
9f6aaa5c | 6481 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
ce2b6ba5 JM |
6482 | while Present (Iface_Prim_Elmt) loop |
6483 | Iface_Prim := Node (Iface_Prim_Elmt); | |
9f6aaa5c | 6484 | Iface_Conv := Convention_Of (Iface_Prim); |
ce2b6ba5 JM |
6485 | |
6486 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
9f6aaa5c | 6487 | and then Iface_Conv /= Op_Conv |
ce2b6ba5 | 6488 | then |
ed2233dc | 6489 | Error_Msg_N |
ce2b6ba5 | 6490 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 6491 | |
ce2b6ba5 | 6492 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c | 6493 | Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
ce2b6ba5 | 6494 | Error_Msg_Sloc := Sloc (Op); |
ec4867fa | 6495 | |
7a963087 | 6496 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 6497 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 6498 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 6499 | else |
ed2233dc | 6500 | Error_Msg_N |
19d846a0 RD |
6501 | ("\\overriding operation % with " & |
6502 | "convention % defined #", Typ); | |
ce2b6ba5 | 6503 | end if; |
ec4867fa | 6504 | |
ce2b6ba5 JM |
6505 | else pragma Assert (Present (Alias (Op))); |
6506 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
ed2233dc | 6507 | Error_Msg_N |
19d846a0 RD |
6508 | ("\\inherited operation % with " & |
6509 | "convention % defined #", Typ); | |
ce2b6ba5 | 6510 | end if; |
ec4867fa | 6511 | |
ce2b6ba5 | 6512 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c AC |
6513 | Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
6514 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
ed2233dc | 6515 | Error_Msg_N |
19d846a0 RD |
6516 | ("\\overridden operation % with " & |
6517 | "convention % defined #", Typ); | |
ec4867fa | 6518 | |
ce2b6ba5 | 6519 | -- Avoid cascading errors |
ec4867fa | 6520 | |
ce2b6ba5 JM |
6521 | return; |
6522 | end if; | |
ec4867fa | 6523 | |
ce2b6ba5 JM |
6524 | Next_Elmt (Iface_Prim_Elmt); |
6525 | end loop; | |
ec4867fa | 6526 | |
ce2b6ba5 | 6527 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
6528 | end loop; |
6529 | end Check_Convention; | |
6530 | ||
6531 | -- Local variables | |
6532 | ||
6533 | Prim_Op : Entity_Id; | |
6534 | Prim_Op_Elmt : Elmt_Id; | |
6535 | ||
6536 | -- Start of processing for Check_Conventions | |
6537 | ||
6538 | begin | |
ce2b6ba5 JM |
6539 | if not Has_Interfaces (Typ) then |
6540 | return; | |
6541 | end if; | |
6542 | ||
6543 | Collect_Interfaces (Typ, Ifaces_List); | |
6544 | ||
0a36105d JM |
6545 | -- The algorithm checks every overriding dispatching operation against |
6546 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 6547 | -- differences in conventions. |
ec4867fa ES |
6548 | |
6549 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
6550 | while Present (Prim_Op_Elmt) loop | |
6551 | Prim_Op := Node (Prim_Op_Elmt); | |
6552 | ||
0a36105d | 6553 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 6554 | -- since they always have the same convention. |
ec4867fa | 6555 | |
ce2b6ba5 JM |
6556 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
6557 | Check_Convention (Prim_Op); | |
ec4867fa ES |
6558 | end if; |
6559 | ||
6560 | Next_Elmt (Prim_Op_Elmt); | |
6561 | end loop; | |
6562 | end Check_Conventions; | |
6563 | ||
996ae0b0 RK |
6564 | ------------------------------ |
6565 | -- Check_Delayed_Subprogram -- | |
6566 | ------------------------------ | |
6567 | ||
6568 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
6569 | F : Entity_Id; | |
6570 | ||
6571 | procedure Possible_Freeze (T : Entity_Id); | |
6572 | -- T is the type of either a formal parameter or of the return type. | |
6573 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
6574 | -- subprogram itself must be delayed. If T is the limited view of an |
6575 | -- incomplete type the subprogram must be frozen as well, because | |
6576 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 6577 | |
82c80734 RD |
6578 | --------------------- |
6579 | -- Possible_Freeze -- | |
6580 | --------------------- | |
6581 | ||
996ae0b0 RK |
6582 | procedure Possible_Freeze (T : Entity_Id) is |
6583 | begin | |
4a13695c | 6584 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
6585 | Set_Has_Delayed_Freeze (Designator); |
6586 | ||
6587 | elsif Is_Access_Type (T) | |
6588 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
6589 | and then not Is_Frozen (Designated_Type (T)) | |
6590 | then | |
6591 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 6592 | |
7b56a91b AC |
6593 | elsif Ekind (T) = E_Incomplete_Type |
6594 | and then From_Limited_With (T) | |
6595 | then | |
e358346d | 6596 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 6597 | |
9aff36e9 RD |
6598 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
6599 | -- of a subprogram or entry declaration. | |
406935b6 AC |
6600 | |
6601 | elsif Ekind (T) = E_Incomplete_Type | |
6602 | and then Ada_Version >= Ada_2012 | |
6603 | then | |
6604 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 6605 | end if; |
4a13695c | 6606 | |
996ae0b0 RK |
6607 | end Possible_Freeze; |
6608 | ||
6609 | -- Start of processing for Check_Delayed_Subprogram | |
6610 | ||
6611 | begin | |
76e3504f AC |
6612 | -- All subprograms, including abstract subprograms, may need a freeze |
6613 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 6614 | |
76e3504f AC |
6615 | Possible_Freeze (Etype (Designator)); |
6616 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 6617 | |
76e3504f AC |
6618 | -- Need delayed freeze if any of the formal types themselves need |
6619 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 6620 | |
76e3504f AC |
6621 | F := First_Formal (Designator); |
6622 | while Present (F) loop | |
6623 | Possible_Freeze (Etype (F)); | |
6624 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
6625 | Next_Formal (F); | |
6626 | end loop; | |
996ae0b0 RK |
6627 | |
6628 | -- Mark functions that return by reference. Note that it cannot be | |
6629 | -- done for delayed_freeze subprograms because the underlying | |
6630 | -- returned type may not be known yet (for private types) | |
6631 | ||
8fde064e | 6632 | if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
996ae0b0 RK |
6633 | declare |
6634 | Typ : constant Entity_Id := Etype (Designator); | |
6635 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
996ae0b0 | 6636 | begin |
51245e2d | 6637 | if Is_Limited_View (Typ) then |
996ae0b0 | 6638 | Set_Returns_By_Ref (Designator); |
048e5cef | 6639 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
6640 | Set_Returns_By_Ref (Designator); |
6641 | end if; | |
6642 | end; | |
6643 | end if; | |
6644 | end Check_Delayed_Subprogram; | |
6645 | ||
6646 | ------------------------------------ | |
6647 | -- Check_Discriminant_Conformance -- | |
6648 | ------------------------------------ | |
6649 | ||
6650 | procedure Check_Discriminant_Conformance | |
6651 | (N : Node_Id; | |
6652 | Prev : Entity_Id; | |
6653 | Prev_Loc : Node_Id) | |
6654 | is | |
6655 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
6656 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
6657 | New_Discr_Id : Entity_Id; | |
6658 | New_Discr_Type : Entity_Id; | |
6659 | ||
6660 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
6661 | -- Post error message for conformance error on given node. Two messages |
6662 | -- are output. The first points to the previous declaration with a | |
6663 | -- general "no conformance" message. The second is the detailed reason, | |
6664 | -- supplied as Msg. The parameter N provide information for a possible | |
6665 | -- & insertion in the message. | |
996ae0b0 RK |
6666 | |
6667 | ----------------------- | |
6668 | -- Conformance_Error -- | |
6669 | ----------------------- | |
6670 | ||
6671 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
6672 | begin | |
6673 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
6674 | Error_Msg_N -- CODEFIX |
6675 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
6676 | Error_Msg_NE (Msg, N, N); |
6677 | end Conformance_Error; | |
6678 | ||
6679 | -- Start of processing for Check_Discriminant_Conformance | |
6680 | ||
6681 | begin | |
6682 | while Present (Old_Discr) and then Present (New_Discr) loop | |
996ae0b0 RK |
6683 | New_Discr_Id := Defining_Identifier (New_Discr); |
6684 | ||
82c80734 RD |
6685 | -- The subtype mark of the discriminant on the full type has not |
6686 | -- been analyzed so we do it here. For an access discriminant a new | |
6687 | -- type is created. | |
996ae0b0 RK |
6688 | |
6689 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
6690 | New_Discr_Type := | |
6691 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
6692 | ||
6693 | else | |
6694 | Analyze (Discriminant_Type (New_Discr)); | |
6695 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
6696 | |
6697 | -- Ada 2005: if the discriminant definition carries a null | |
6698 | -- exclusion, create an itype to check properly for consistency | |
6699 | -- with partial declaration. | |
6700 | ||
6701 | if Is_Access_Type (New_Discr_Type) | |
8fde064e | 6702 | and then Null_Exclusion_Present (New_Discr) |
e50e1c5e AC |
6703 | then |
6704 | New_Discr_Type := | |
6705 | Create_Null_Excluding_Itype | |
6706 | (T => New_Discr_Type, | |
6707 | Related_Nod => New_Discr, | |
6708 | Scope_Id => Current_Scope); | |
6709 | end if; | |
996ae0b0 RK |
6710 | end if; |
6711 | ||
6712 | if not Conforming_Types | |
6713 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
6714 | then | |
6715 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
6716 | return; | |
fbf5a39b | 6717 | else |
82c80734 RD |
6718 | -- Treat the new discriminant as an occurrence of the old one, |
6719 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
6720 | -- information, for completeness. |
6721 | ||
6722 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
6723 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
6724 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
6725 | end if; |
6726 | ||
6727 | -- Names must match | |
6728 | ||
6729 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
6730 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
6731 | return; | |
6732 | end if; | |
6733 | ||
6734 | -- Default expressions must match | |
6735 | ||
6736 | declare | |
6737 | NewD : constant Boolean := | |
6738 | Present (Expression (New_Discr)); | |
6739 | OldD : constant Boolean := | |
6740 | Present (Expression (Parent (Old_Discr))); | |
6741 | ||
6742 | begin | |
6743 | if NewD or OldD then | |
6744 | ||
6745 | -- The old default value has been analyzed and expanded, | |
6746 | -- because the current full declaration will have frozen | |
82c80734 RD |
6747 | -- everything before. The new default values have not been |
6748 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
6749 | |
6750 | if NewD then | |
21d27997 | 6751 | Preanalyze_Spec_Expression |
996ae0b0 RK |
6752 | (Expression (New_Discr), New_Discr_Type); |
6753 | end if; | |
6754 | ||
6755 | if not (NewD and OldD) | |
6756 | or else not Fully_Conformant_Expressions | |
6757 | (Expression (Parent (Old_Discr)), | |
6758 | Expression (New_Discr)) | |
6759 | ||
6760 | then | |
6761 | Conformance_Error | |
6762 | ("default expression for & does not match!", | |
6763 | New_Discr_Id); | |
6764 | return; | |
6765 | end if; | |
6766 | end if; | |
6767 | end; | |
6768 | ||
6769 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
6770 | ||
0ab80019 | 6771 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
6772 | declare |
6773 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
6774 | ||
6775 | begin | |
6776 | -- Grouping (use of comma in param lists) must be the same | |
6777 | -- This is where we catch a misconformance like: | |
6778 | ||
60370fb1 | 6779 | -- A, B : Integer |
996ae0b0 RK |
6780 | -- A : Integer; B : Integer |
6781 | ||
6782 | -- which are represented identically in the tree except | |
6783 | -- for the setting of the flags More_Ids and Prev_Ids. | |
6784 | ||
6785 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
6786 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
6787 | then | |
6788 | Conformance_Error | |
6789 | ("grouping of & does not match!", New_Discr_Id); | |
6790 | return; | |
6791 | end if; | |
6792 | end; | |
6793 | end if; | |
6794 | ||
6795 | Next_Discriminant (Old_Discr); | |
6796 | Next (New_Discr); | |
6797 | end loop; | |
6798 | ||
6799 | if Present (Old_Discr) then | |
6800 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
6801 | return; | |
6802 | ||
6803 | elsif Present (New_Discr) then | |
6804 | Conformance_Error | |
6805 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
6806 | return; | |
6807 | end if; | |
6808 | end Check_Discriminant_Conformance; | |
6809 | ||
6810 | ---------------------------- | |
6811 | -- Check_Fully_Conformant -- | |
6812 | ---------------------------- | |
6813 | ||
6814 | procedure Check_Fully_Conformant | |
6815 | (New_Id : Entity_Id; | |
6816 | Old_Id : Entity_Id; | |
6817 | Err_Loc : Node_Id := Empty) | |
6818 | is | |
6819 | Result : Boolean; | |
81db9d77 | 6820 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6821 | begin |
6822 | Check_Conformance | |
6823 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
6824 | end Check_Fully_Conformant; | |
6825 | ||
6826 | --------------------------- | |
6827 | -- Check_Mode_Conformant -- | |
6828 | --------------------------- | |
6829 | ||
6830 | procedure Check_Mode_Conformant | |
6831 | (New_Id : Entity_Id; | |
6832 | Old_Id : Entity_Id; | |
6833 | Err_Loc : Node_Id := Empty; | |
6834 | Get_Inst : Boolean := False) | |
6835 | is | |
6836 | Result : Boolean; | |
81db9d77 | 6837 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6838 | begin |
6839 | Check_Conformance | |
6840 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
6841 | end Check_Mode_Conformant; | |
6842 | ||
fbf5a39b | 6843 | -------------------------------- |
758c442c | 6844 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
6845 | -------------------------------- |
6846 | ||
758c442c | 6847 | procedure Check_Overriding_Indicator |
ec4867fa | 6848 | (Subp : Entity_Id; |
5d37ba92 ES |
6849 | Overridden_Subp : Entity_Id; |
6850 | Is_Primitive : Boolean) | |
fbf5a39b | 6851 | is |
758c442c GD |
6852 | Decl : Node_Id; |
6853 | Spec : Node_Id; | |
fbf5a39b AC |
6854 | |
6855 | begin | |
ec4867fa | 6856 | -- No overriding indicator for literals |
fbf5a39b | 6857 | |
ec4867fa | 6858 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 6859 | return; |
fbf5a39b | 6860 | |
ec4867fa ES |
6861 | elsif Ekind (Subp) = E_Entry then |
6862 | Decl := Parent (Subp); | |
6863 | ||
53b10ce9 AC |
6864 | -- No point in analyzing a malformed operator |
6865 | ||
6866 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
6867 | and then Error_Posted (Subp) | |
6868 | then | |
6869 | return; | |
6870 | ||
758c442c GD |
6871 | else |
6872 | Decl := Unit_Declaration_Node (Subp); | |
6873 | end if; | |
fbf5a39b | 6874 | |
800621e0 RD |
6875 | if Nkind_In (Decl, N_Subprogram_Body, |
6876 | N_Subprogram_Body_Stub, | |
6877 | N_Subprogram_Declaration, | |
6878 | N_Abstract_Subprogram_Declaration, | |
6879 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
6880 | then |
6881 | Spec := Specification (Decl); | |
ec4867fa ES |
6882 | |
6883 | elsif Nkind (Decl) = N_Entry_Declaration then | |
6884 | Spec := Decl; | |
6885 | ||
758c442c GD |
6886 | else |
6887 | return; | |
6888 | end if; | |
fbf5a39b | 6889 | |
e7d72fb9 AC |
6890 | -- The overriding operation is type conformant with the overridden one, |
6891 | -- but the names of the formals are not required to match. If the names | |
6823270c | 6892 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
6893 | -- source of confusion that is worth diagnosing. Controlling formals |
6894 | -- often carry names that reflect the type, and it is not worthwhile | |
6895 | -- requiring that their names match. | |
6896 | ||
c9e7bd8e | 6897 | if Present (Overridden_Subp) |
e7d72fb9 AC |
6898 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
6899 | then | |
6900 | declare | |
6901 | Form1 : Entity_Id; | |
6902 | Form2 : Entity_Id; | |
6903 | ||
6904 | begin | |
6905 | Form1 := First_Formal (Subp); | |
6906 | Form2 := First_Formal (Overridden_Subp); | |
6907 | ||
c9e7bd8e AC |
6908 | -- If the overriding operation is a synchronized operation, skip |
6909 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
6910 | -- implicit in the new one. If the operation is declared in the |
6911 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 6912 | |
6823270c AC |
6913 | if Is_Concurrent_Type (Scope (Subp)) |
6914 | and then Is_Tagged_Type (Scope (Subp)) | |
6915 | and then not Has_Completion (Scope (Subp)) | |
6916 | then | |
c9e7bd8e AC |
6917 | Form2 := Next_Formal (Form2); |
6918 | end if; | |
6919 | ||
e7d72fb9 AC |
6920 | if Present (Form1) then |
6921 | Form1 := Next_Formal (Form1); | |
6922 | Form2 := Next_Formal (Form2); | |
6923 | end if; | |
6924 | ||
6925 | while Present (Form1) loop | |
6926 | if not Is_Controlling_Formal (Form1) | |
6927 | and then Present (Next_Formal (Form2)) | |
6928 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
6929 | then | |
6930 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
6931 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 6932 | Error_Msg_NE |
19d846a0 | 6933 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
6934 | Form1, Form1); |
6935 | exit; | |
6936 | end if; | |
6937 | ||
6938 | Next_Formal (Form1); | |
6939 | Next_Formal (Form2); | |
6940 | end loop; | |
6941 | end; | |
6942 | end if; | |
6943 | ||
676e8420 AC |
6944 | -- If there is an overridden subprogram, then check that there is no |
6945 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
6946 | -- This is not done if the overridden subprogram is marked as hidden, |
6947 | -- which can occur for the case of inherited controlled operations | |
6948 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
6949 | -- subprogram is not itself hidden. (Note: This condition could probably | |
6950 | -- be simplified, leaving out the testing for the specific controlled | |
6951 | -- cases, but it seems safer and clearer this way, and echoes similar | |
6952 | -- special-case tests of this kind in other places.) | |
6953 | ||
fd0d899b | 6954 | if Present (Overridden_Subp) |
51bf9bdf AC |
6955 | and then (not Is_Hidden (Overridden_Subp) |
6956 | or else | |
b69cd36a AC |
6957 | (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
6958 | Name_Adjust, | |
6959 | Name_Finalize) | |
f0709ca6 AC |
6960 | and then Present (Alias (Overridden_Subp)) |
6961 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 6962 | then |
ec4867fa ES |
6963 | if Must_Not_Override (Spec) then |
6964 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 6965 | |
ec4867fa | 6966 | if Ekind (Subp) = E_Entry then |
ed2233dc | 6967 | Error_Msg_NE |
5d37ba92 | 6968 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 6969 | else |
ed2233dc | 6970 | Error_Msg_NE |
5d37ba92 | 6971 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 6972 | end if; |
21d27997 | 6973 | |
bd603506 | 6974 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
6975 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
6976 | -- operation. This operation should not be inherited by other limited | |
6977 | -- controlled types. An explicit Adjust for them is not overriding. | |
6978 | ||
6979 | elsif Must_Override (Spec) | |
6980 | and then Chars (Overridden_Subp) = Name_Adjust | |
6981 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
6982 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
6983 | and then |
6984 | Is_Predefined_File_Name | |
6985 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
6986 | then |
6987 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
6988 | ||
21d27997 | 6989 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
6990 | if Is_Init_Proc (Subp) then |
6991 | null; | |
6992 | ||
6993 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
6994 | |
6995 | -- For entities generated by Derive_Subprograms the overridden | |
6996 | -- operation is the inherited primitive (which is available | |
6997 | -- through the attribute alias) | |
6998 | ||
6999 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 7000 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 7001 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
7002 | and then Find_Dispatching_Type (Overridden_Subp) = |
7003 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
7004 | and then Present (Alias (Overridden_Subp)) |
7005 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
7006 | then | |
7007 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 7008 | |
1c1289e7 AC |
7009 | else |
7010 | Set_Overridden_Operation (Subp, Overridden_Subp); | |
7011 | end if; | |
7012 | end if; | |
ec4867fa | 7013 | end if; |
f937473f | 7014 | |
618fb570 AC |
7015 | -- If primitive flag is set or this is a protected operation, then |
7016 | -- the operation is overriding at the point of its declaration, so | |
7017 | -- warn if necessary. Otherwise it may have been declared before the | |
7018 | -- operation it overrides and no check is required. | |
3c25856a AC |
7019 | |
7020 | if Style_Check | |
618fb570 AC |
7021 | and then not Must_Override (Spec) |
7022 | and then (Is_Primitive | |
7023 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 7024 | then |
235f4375 AC |
7025 | Style.Missing_Overriding (Decl, Subp); |
7026 | end if; | |
7027 | ||
53b10ce9 AC |
7028 | -- If Subp is an operator, it may override a predefined operation, if |
7029 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 7030 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
7031 | -- representation for predefined operators. We have to check whether the |
7032 | -- signature of Subp matches that of a predefined operator. Note that | |
7033 | -- first argument provides the name of the operator, and the second | |
7034 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
7035 | -- If the indicator is overriding, then the operator must match a |
7036 | -- predefined signature, because we know already that there is no | |
7037 | -- explicit overridden operation. | |
f937473f | 7038 | |
21d27997 | 7039 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 7040 | if Must_Not_Override (Spec) then |
f937473f | 7041 | |
806f6d37 AC |
7042 | -- If this is not a primitive or a protected subprogram, then |
7043 | -- "not overriding" is illegal. | |
618fb570 | 7044 | |
806f6d37 AC |
7045 | if not Is_Primitive |
7046 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
7047 | then | |
7048 | Error_Msg_N | |
7049 | ("overriding indicator only allowed " | |
7050 | & "if subprogram is primitive", Subp); | |
618fb570 | 7051 | |
806f6d37 AC |
7052 | elsif Can_Override_Operator (Subp) then |
7053 | Error_Msg_NE | |
7054 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
7055 | end if; | |
f937473f | 7056 | |
806f6d37 AC |
7057 | elsif Must_Override (Spec) then |
7058 | if No (Overridden_Operation (Subp)) | |
7059 | and then not Can_Override_Operator (Subp) | |
7060 | then | |
7061 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
7062 | end if; | |
5d37ba92 | 7063 | |
806f6d37 AC |
7064 | elsif not Error_Posted (Subp) |
7065 | and then Style_Check | |
7066 | and then Can_Override_Operator (Subp) | |
7067 | and then | |
7068 | not Is_Predefined_File_Name | |
7069 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
7070 | then | |
7071 | -- If style checks are enabled, indicate that the indicator is | |
7072 | -- missing. However, at the point of declaration, the type of | |
7073 | -- which this is a primitive operation may be private, in which | |
7074 | -- case the indicator would be premature. | |
235f4375 | 7075 | |
806f6d37 AC |
7076 | if Has_Private_Declaration (Etype (Subp)) |
7077 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 7078 | then |
806f6d37 AC |
7079 | null; |
7080 | else | |
7081 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 7082 | end if; |
806f6d37 | 7083 | end if; |
21d27997 RD |
7084 | |
7085 | elsif Must_Override (Spec) then | |
7086 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 7087 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 7088 | else |
ed2233dc | 7089 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 7090 | end if; |
5d37ba92 ES |
7091 | |
7092 | -- If the operation is marked "not overriding" and it's not primitive | |
7093 | -- then an error is issued, unless this is an operation of a task or | |
7094 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
7095 | -- has been specified have already been checked above. | |
7096 | ||
7097 | elsif Must_Not_Override (Spec) | |
7098 | and then not Is_Primitive | |
7099 | and then Ekind (Subp) /= E_Entry | |
7100 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
7101 | then | |
ed2233dc | 7102 | Error_Msg_N |
5d37ba92 ES |
7103 | ("overriding indicator only allowed if subprogram is primitive", |
7104 | Subp); | |
5d37ba92 | 7105 | return; |
fbf5a39b | 7106 | end if; |
758c442c | 7107 | end Check_Overriding_Indicator; |
fbf5a39b | 7108 | |
996ae0b0 RK |
7109 | ------------------- |
7110 | -- Check_Returns -- | |
7111 | ------------------- | |
7112 | ||
0a36105d JM |
7113 | -- Note: this procedure needs to know far too much about how the expander |
7114 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
7115 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
7116 | -- works, but is not very clean. It would be better if the expansion | |
7117 | -- routines would leave Original_Node working nicely, and we could use | |
7118 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
7119 | ||
996ae0b0 RK |
7120 | procedure Check_Returns |
7121 | (HSS : Node_Id; | |
7122 | Mode : Character; | |
c8ef728f ES |
7123 | Err : out Boolean; |
7124 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
7125 | is |
7126 | Handler : Node_Id; | |
7127 | ||
7128 | procedure Check_Statement_Sequence (L : List_Id); | |
7129 | -- Internal recursive procedure to check a list of statements for proper | |
7130 | -- termination by a return statement (or a transfer of control or a | |
7131 | -- compound statement that is itself internally properly terminated). | |
7132 | ||
7133 | ------------------------------ | |
7134 | -- Check_Statement_Sequence -- | |
7135 | ------------------------------ | |
7136 | ||
7137 | procedure Check_Statement_Sequence (L : List_Id) is | |
7138 | Last_Stm : Node_Id; | |
0a36105d | 7139 | Stm : Node_Id; |
996ae0b0 RK |
7140 | Kind : Node_Kind; |
7141 | ||
7142 | Raise_Exception_Call : Boolean; | |
7143 | -- Set True if statement sequence terminated by Raise_Exception call | |
7144 | -- or a Reraise_Occurrence call. | |
7145 | ||
7146 | begin | |
7147 | Raise_Exception_Call := False; | |
7148 | ||
7149 | -- Get last real statement | |
7150 | ||
7151 | Last_Stm := Last (L); | |
7152 | ||
0a36105d JM |
7153 | -- Deal with digging out exception handler statement sequences that |
7154 | -- have been transformed by the local raise to goto optimization. | |
7155 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
7156 | -- optimization has occurred, we are looking at something like: | |
7157 | ||
7158 | -- begin | |
7159 | -- original stmts in block | |
7160 | ||
7161 | -- exception \ | |
7162 | -- when excep1 => | | |
7163 | -- goto L1; | omitted if No_Exception_Propagation | |
7164 | -- when excep2 => | | |
7165 | -- goto L2; / | |
7166 | -- end; | |
7167 | ||
7168 | -- goto L3; -- skip handler when exception not raised | |
7169 | ||
7170 | -- <<L1>> -- target label for local exception | |
7171 | -- begin | |
7172 | -- estmts1 | |
7173 | -- end; | |
7174 | ||
7175 | -- goto L3; | |
7176 | ||
7177 | -- <<L2>> | |
7178 | -- begin | |
7179 | -- estmts2 | |
7180 | -- end; | |
7181 | ||
7182 | -- <<L3>> | |
7183 | ||
7184 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
7185 | -- sequences (which were the original sequences of statements in | |
7186 | -- the exception handlers) and check them. | |
7187 | ||
8fde064e | 7188 | if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
0a36105d JM |
7189 | Stm := Last_Stm; |
7190 | loop | |
7191 | Prev (Stm); | |
7192 | exit when No (Stm); | |
7193 | exit when Nkind (Stm) /= N_Block_Statement; | |
7194 | exit when not Exception_Junk (Stm); | |
7195 | Prev (Stm); | |
7196 | exit when No (Stm); | |
7197 | exit when Nkind (Stm) /= N_Label; | |
7198 | exit when not Exception_Junk (Stm); | |
7199 | Check_Statement_Sequence | |
7200 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
7201 | ||
7202 | Prev (Stm); | |
7203 | Last_Stm := Stm; | |
7204 | exit when No (Stm); | |
7205 | exit when Nkind (Stm) /= N_Goto_Statement; | |
7206 | exit when not Exception_Junk (Stm); | |
7207 | end loop; | |
7208 | end if; | |
7209 | ||
996ae0b0 RK |
7210 | -- Don't count pragmas |
7211 | ||
7212 | while Nkind (Last_Stm) = N_Pragma | |
7213 | ||
7214 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
7215 | ||
7216 | or else | |
7217 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
7218 | and then | |
7219 | Nkind (Name (Last_Stm)) = N_Identifier | |
7220 | and then | |
7221 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
7222 | ||
7223 | -- Don't count exception junk | |
7224 | ||
7225 | or else | |
800621e0 RD |
7226 | (Nkind_In (Last_Stm, N_Goto_Statement, |
7227 | N_Label, | |
7228 | N_Object_Declaration) | |
8fde064e | 7229 | and then Exception_Junk (Last_Stm)) |
0a36105d JM |
7230 | or else Nkind (Last_Stm) in N_Push_xxx_Label |
7231 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
e3b3266c AC |
7232 | |
7233 | -- Inserted code, such as finalization calls, is irrelevant: we only | |
7234 | -- need to check original source. | |
7235 | ||
7236 | or else Is_Rewrite_Insertion (Last_Stm) | |
996ae0b0 RK |
7237 | loop |
7238 | Prev (Last_Stm); | |
7239 | end loop; | |
7240 | ||
7241 | -- Here we have the "real" last statement | |
7242 | ||
7243 | Kind := Nkind (Last_Stm); | |
7244 | ||
7245 | -- Transfer of control, OK. Note that in the No_Return procedure | |
7246 | -- case, we already diagnosed any explicit return statements, so | |
7247 | -- we can treat them as OK in this context. | |
7248 | ||
7249 | if Is_Transfer (Last_Stm) then | |
7250 | return; | |
7251 | ||
7252 | -- Check cases of explicit non-indirect procedure calls | |
7253 | ||
7254 | elsif Kind = N_Procedure_Call_Statement | |
7255 | and then Is_Entity_Name (Name (Last_Stm)) | |
7256 | then | |
7257 | -- Check call to Raise_Exception procedure which is treated | |
7258 | -- specially, as is a call to Reraise_Occurrence. | |
7259 | ||
7260 | -- We suppress the warning in these cases since it is likely that | |
7261 | -- the programmer really does not expect to deal with the case | |
7262 | -- of Null_Occurrence, and thus would find a warning about a | |
7263 | -- missing return curious, and raising Program_Error does not | |
7264 | -- seem such a bad behavior if this does occur. | |
7265 | ||
c8ef728f ES |
7266 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
7267 | -- behavior will be to raise Constraint_Error (see AI-329). | |
7268 | ||
996ae0b0 RK |
7269 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
7270 | or else | |
7271 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
7272 | then | |
7273 | Raise_Exception_Call := True; | |
7274 | ||
7275 | -- For Raise_Exception call, test first argument, if it is | |
7276 | -- an attribute reference for a 'Identity call, then we know | |
7277 | -- that the call cannot possibly return. | |
7278 | ||
7279 | declare | |
7280 | Arg : constant Node_Id := | |
7281 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
7282 | begin |
7283 | if Nkind (Arg) = N_Attribute_Reference | |
7284 | and then Attribute_Name (Arg) = Name_Identity | |
7285 | then | |
7286 | return; | |
7287 | end if; | |
7288 | end; | |
7289 | end if; | |
7290 | ||
7291 | -- If statement, need to look inside if there is an else and check | |
7292 | -- each constituent statement sequence for proper termination. | |
7293 | ||
7294 | elsif Kind = N_If_Statement | |
7295 | and then Present (Else_Statements (Last_Stm)) | |
7296 | then | |
7297 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
7298 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
7299 | ||
7300 | if Present (Elsif_Parts (Last_Stm)) then | |
7301 | declare | |
7302 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
7303 | ||
7304 | begin | |
7305 | while Present (Elsif_Part) loop | |
7306 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
7307 | Next (Elsif_Part); | |
7308 | end loop; | |
7309 | end; | |
7310 | end if; | |
7311 | ||
7312 | return; | |
7313 | ||
7314 | -- Case statement, check each case for proper termination | |
7315 | ||
7316 | elsif Kind = N_Case_Statement then | |
7317 | declare | |
7318 | Case_Alt : Node_Id; | |
996ae0b0 RK |
7319 | begin |
7320 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
7321 | while Present (Case_Alt) loop | |
7322 | Check_Statement_Sequence (Statements (Case_Alt)); | |
7323 | Next_Non_Pragma (Case_Alt); | |
7324 | end loop; | |
7325 | end; | |
7326 | ||
7327 | return; | |
7328 | ||
7329 | -- Block statement, check its handled sequence of statements | |
7330 | ||
7331 | elsif Kind = N_Block_Statement then | |
7332 | declare | |
7333 | Err1 : Boolean; | |
7334 | ||
7335 | begin | |
7336 | Check_Returns | |
7337 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
7338 | ||
7339 | if Err1 then | |
7340 | Err := True; | |
7341 | end if; | |
7342 | ||
7343 | return; | |
7344 | end; | |
7345 | ||
7346 | -- Loop statement. If there is an iteration scheme, we can definitely | |
7347 | -- fall out of the loop. Similarly if there is an exit statement, we | |
7348 | -- can fall out. In either case we need a following return. | |
7349 | ||
7350 | elsif Kind = N_Loop_Statement then | |
7351 | if Present (Iteration_Scheme (Last_Stm)) | |
7352 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
7353 | then | |
7354 | null; | |
7355 | ||
f3d57416 RW |
7356 | -- A loop with no exit statement or iteration scheme is either |
7357 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
7358 | -- In either case, no warning is required. |
7359 | ||
7360 | else | |
7361 | return; | |
7362 | end if; | |
7363 | ||
7364 | -- Timed entry call, check entry call and delay alternatives | |
7365 | ||
7366 | -- Note: in expanded code, the timed entry call has been converted | |
7367 | -- to a set of expanded statements on which the check will work | |
7368 | -- correctly in any case. | |
7369 | ||
7370 | elsif Kind = N_Timed_Entry_Call then | |
7371 | declare | |
7372 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
7373 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
7374 | ||
7375 | begin | |
7376 | -- If statement sequence of entry call alternative is missing, | |
7377 | -- then we can definitely fall through, and we post the error | |
7378 | -- message on the entry call alternative itself. | |
7379 | ||
7380 | if No (Statements (ECA)) then | |
7381 | Last_Stm := ECA; | |
7382 | ||
7383 | -- If statement sequence of delay alternative is missing, then | |
7384 | -- we can definitely fall through, and we post the error | |
7385 | -- message on the delay alternative itself. | |
7386 | ||
7387 | -- Note: if both ECA and DCA are missing the return, then we | |
7388 | -- post only one message, should be enough to fix the bugs. | |
7389 | -- If not we will get a message next time on the DCA when the | |
a90bd866 | 7390 | -- ECA is fixed. |
996ae0b0 RK |
7391 | |
7392 | elsif No (Statements (DCA)) then | |
7393 | Last_Stm := DCA; | |
7394 | ||
7395 | -- Else check both statement sequences | |
7396 | ||
7397 | else | |
7398 | Check_Statement_Sequence (Statements (ECA)); | |
7399 | Check_Statement_Sequence (Statements (DCA)); | |
7400 | return; | |
7401 | end if; | |
7402 | end; | |
7403 | ||
7404 | -- Conditional entry call, check entry call and else part | |
7405 | ||
7406 | -- Note: in expanded code, the conditional entry call has been | |
7407 | -- converted to a set of expanded statements on which the check | |
7408 | -- will work correctly in any case. | |
7409 | ||
7410 | elsif Kind = N_Conditional_Entry_Call then | |
7411 | declare | |
7412 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
7413 | ||
7414 | begin | |
7415 | -- If statement sequence of entry call alternative is missing, | |
7416 | -- then we can definitely fall through, and we post the error | |
7417 | -- message on the entry call alternative itself. | |
7418 | ||
7419 | if No (Statements (ECA)) then | |
7420 | Last_Stm := ECA; | |
7421 | ||
7422 | -- Else check statement sequence and else part | |
7423 | ||
7424 | else | |
7425 | Check_Statement_Sequence (Statements (ECA)); | |
7426 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
7427 | return; | |
7428 | end if; | |
7429 | end; | |
7430 | end if; | |
7431 | ||
7432 | -- If we fall through, issue appropriate message | |
7433 | ||
7434 | if Mode = 'F' then | |
996ae0b0 | 7435 | if not Raise_Exception_Call then |
b465ef6f AC |
7436 | |
7437 | -- In GNATprove mode, it is an error to have a missing return | |
7438 | ||
43417b90 | 7439 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
7440 | Error_Msg_N |
7441 | ("RETURN statement missing following this statement<<!", | |
7442 | Last_Stm); | |
7443 | Error_Msg_N | |
7444 | ("\Program_Error ]<<!", Last_Stm); | |
996ae0b0 RK |
7445 | end if; |
7446 | ||
7447 | -- Note: we set Err even though we have not issued a warning | |
7448 | -- because we still have a case of a missing return. This is | |
7449 | -- an extremely marginal case, probably will never be noticed | |
7450 | -- but we might as well get it right. | |
7451 | ||
7452 | Err := True; | |
7453 | ||
c8ef728f ES |
7454 | -- Otherwise we have the case of a procedure marked No_Return |
7455 | ||
996ae0b0 | 7456 | else |
800621e0 | 7457 | if not Raise_Exception_Call then |
4a28b181 AC |
7458 | if GNATprove_Mode then |
7459 | Error_Msg_N | |
7460 | ("implied return after this statement " | |
7461 | & "would have raised Program_Error", Last_Stm); | |
7462 | else | |
7463 | Error_Msg_N | |
7464 | ("implied return after this statement " | |
7465 | & "will raise Program_Error??", Last_Stm); | |
7466 | end if; | |
7467 | ||
43417b90 | 7468 | Error_Msg_Warn := SPARK_Mode /= On; |
800621e0 | 7469 | Error_Msg_NE |
4a28b181 | 7470 | ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
800621e0 | 7471 | end if; |
c8ef728f ES |
7472 | |
7473 | declare | |
7474 | RE : constant Node_Id := | |
7475 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
7476 | Reason => PE_Implicit_Return); | |
7477 | begin | |
7478 | Insert_After (Last_Stm, RE); | |
7479 | Analyze (RE); | |
7480 | end; | |
996ae0b0 RK |
7481 | end if; |
7482 | end Check_Statement_Sequence; | |
7483 | ||
7484 | -- Start of processing for Check_Returns | |
7485 | ||
7486 | begin | |
7487 | Err := False; | |
7488 | Check_Statement_Sequence (Statements (HSS)); | |
7489 | ||
7490 | if Present (Exception_Handlers (HSS)) then | |
7491 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
7492 | while Present (Handler) loop | |
7493 | Check_Statement_Sequence (Statements (Handler)); | |
7494 | Next_Non_Pragma (Handler); | |
7495 | end loop; | |
7496 | end if; | |
7497 | end Check_Returns; | |
7498 | ||
7499 | ---------------------------- | |
7500 | -- Check_Subprogram_Order -- | |
7501 | ---------------------------- | |
7502 | ||
7503 | procedure Check_Subprogram_Order (N : Node_Id) is | |
7504 | ||
7505 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
7506 | -- This is used to check if S1 > S2 in the sense required by this test, |
7507 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 7508 | |
82c80734 RD |
7509 | ----------------------------- |
7510 | -- Subprogram_Name_Greater -- | |
7511 | ----------------------------- | |
7512 | ||
996ae0b0 RK |
7513 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
7514 | L1, L2 : Positive; | |
7515 | N1, N2 : Natural; | |
7516 | ||
7517 | begin | |
67336960 AC |
7518 | -- Deal with special case where names are identical except for a |
7519 | -- numerical suffix. These are handled specially, taking the numeric | |
7520 | -- ordering from the suffix into account. | |
996ae0b0 RK |
7521 | |
7522 | L1 := S1'Last; | |
7523 | while S1 (L1) in '0' .. '9' loop | |
7524 | L1 := L1 - 1; | |
7525 | end loop; | |
7526 | ||
7527 | L2 := S2'Last; | |
7528 | while S2 (L2) in '0' .. '9' loop | |
7529 | L2 := L2 - 1; | |
7530 | end loop; | |
7531 | ||
67336960 | 7532 | -- If non-numeric parts non-equal, do straight compare |
996ae0b0 | 7533 | |
67336960 AC |
7534 | if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
7535 | return S1 > S2; | |
996ae0b0 RK |
7536 | |
7537 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
7538 | -- that a missing suffix is treated as numeric zero in this test. | |
7539 | ||
7540 | else | |
7541 | N1 := 0; | |
7542 | while L1 < S1'Last loop | |
7543 | L1 := L1 + 1; | |
7544 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
7545 | end loop; | |
7546 | ||
7547 | N2 := 0; | |
7548 | while L2 < S2'Last loop | |
7549 | L2 := L2 + 1; | |
7550 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
7551 | end loop; | |
7552 | ||
7553 | return N1 > N2; | |
7554 | end if; | |
7555 | end Subprogram_Name_Greater; | |
7556 | ||
7557 | -- Start of processing for Check_Subprogram_Order | |
7558 | ||
7559 | begin | |
7560 | -- Check body in alpha order if this is option | |
7561 | ||
fbf5a39b | 7562 | if Style_Check |
bc202b70 | 7563 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
7564 | and then Nkind (N) = N_Subprogram_Body |
7565 | and then Comes_From_Source (N) | |
7566 | and then In_Extended_Main_Source_Unit (N) | |
7567 | then | |
7568 | declare | |
7569 | LSN : String_Ptr | |
7570 | renames Scope_Stack.Table | |
7571 | (Scope_Stack.Last).Last_Subprogram_Name; | |
7572 | ||
7573 | Body_Id : constant Entity_Id := | |
7574 | Defining_Entity (Specification (N)); | |
7575 | ||
7576 | begin | |
7577 | Get_Decoded_Name_String (Chars (Body_Id)); | |
7578 | ||
7579 | if LSN /= null then | |
7580 | if Subprogram_Name_Greater | |
7581 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
7582 | then | |
7583 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
7584 | end if; | |
7585 | ||
7586 | Free (LSN); | |
7587 | end if; | |
7588 | ||
7589 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
7590 | end; | |
7591 | end if; | |
7592 | end Check_Subprogram_Order; | |
7593 | ||
7594 | ------------------------------ | |
7595 | -- Check_Subtype_Conformant -- | |
7596 | ------------------------------ | |
7597 | ||
7598 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
7599 | (New_Id : Entity_Id; |
7600 | Old_Id : Entity_Id; | |
7601 | Err_Loc : Node_Id := Empty; | |
f307415a AC |
7602 | Skip_Controlling_Formals : Boolean := False; |
7603 | Get_Inst : Boolean := False) | |
996ae0b0 RK |
7604 | is |
7605 | Result : Boolean; | |
81db9d77 | 7606 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7607 | begin |
7608 | Check_Conformance | |
ce2b6ba5 | 7609 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
f307415a AC |
7610 | Skip_Controlling_Formals => Skip_Controlling_Formals, |
7611 | Get_Inst => Get_Inst); | |
996ae0b0 RK |
7612 | end Check_Subtype_Conformant; |
7613 | ||
7614 | --------------------------- | |
7615 | -- Check_Type_Conformant -- | |
7616 | --------------------------- | |
7617 | ||
7618 | procedure Check_Type_Conformant | |
7619 | (New_Id : Entity_Id; | |
7620 | Old_Id : Entity_Id; | |
7621 | Err_Loc : Node_Id := Empty) | |
7622 | is | |
7623 | Result : Boolean; | |
81db9d77 | 7624 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7625 | begin |
7626 | Check_Conformance | |
7627 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
7628 | end Check_Type_Conformant; | |
7629 | ||
806f6d37 AC |
7630 | --------------------------- |
7631 | -- Can_Override_Operator -- | |
7632 | --------------------------- | |
7633 | ||
7634 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
7635 | Typ : Entity_Id; | |
f146302c | 7636 | |
806f6d37 AC |
7637 | begin |
7638 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
7639 | return False; | |
7640 | ||
7641 | else | |
7642 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
7643 | ||
f146302c AC |
7644 | -- Check explicitly that the operation is a primitive of the type |
7645 | ||
806f6d37 | 7646 | return Operator_Matches_Spec (Subp, Subp) |
f146302c | 7647 | and then not Is_Generic_Type (Typ) |
806f6d37 AC |
7648 | and then Scope (Subp) = Scope (Typ) |
7649 | and then not Is_Class_Wide_Type (Typ); | |
7650 | end if; | |
7651 | end Can_Override_Operator; | |
7652 | ||
996ae0b0 RK |
7653 | ---------------------- |
7654 | -- Conforming_Types -- | |
7655 | ---------------------- | |
7656 | ||
7657 | function Conforming_Types | |
7658 | (T1 : Entity_Id; | |
7659 | T2 : Entity_Id; | |
7660 | Ctype : Conformance_Type; | |
d05ef0ab | 7661 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
7662 | is |
7663 | Type_1 : Entity_Id := T1; | |
7664 | Type_2 : Entity_Id := T2; | |
af4b9434 | 7665 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
7666 | |
7667 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
7668 | -- If neither T1 nor T2 are generic actual types, or if they are in |
7669 | -- different scopes (e.g. parent and child instances), then verify that | |
7670 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
7671 | -- subtype chain. The whole purpose of this procedure is to prevent | |
7672 | -- spurious ambiguities in an instantiation that may arise if two | |
7673 | -- distinct generic types are instantiated with the same actual. | |
7674 | ||
5d37ba92 ES |
7675 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
7676 | -- An access parameter can designate an incomplete type. If the | |
7677 | -- incomplete type is the limited view of a type from a limited_ | |
7678 | -- with_clause, check whether the non-limited view is available. If | |
7679 | -- it is a (non-limited) incomplete type, get the full view. | |
7680 | ||
0a36105d JM |
7681 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
7682 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
7683 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
7684 | -- with view of a type is used in a subprogram declaration and the | |
7685 | -- subprogram body is in the scope of a regular with clause for the | |
7686 | -- same unit. In such a case, the two type entities can be considered | |
7687 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
7688 | |
7689 | ---------------------- | |
7690 | -- Base_Types_Match -- | |
7691 | ---------------------- | |
7692 | ||
7693 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
8fde064e AC |
7694 | BT1 : constant Entity_Id := Base_Type (T1); |
7695 | BT2 : constant Entity_Id := Base_Type (T2); | |
7696 | ||
996ae0b0 RK |
7697 | begin |
7698 | if T1 = T2 then | |
7699 | return True; | |
7700 | ||
8fde064e | 7701 | elsif BT1 = BT2 then |
996ae0b0 | 7702 | |
0a36105d | 7703 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
7704 | -- check that the generic actual is an ancestor subtype of the |
7705 | -- other ???. | |
586ecbf3 | 7706 | |
70f4ad20 AC |
7707 | -- See code in Find_Corresponding_Spec that applies an additional |
7708 | -- filter to handle accidental amiguities in instances. | |
996ae0b0 RK |
7709 | |
7710 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
7711 | or else not Is_Generic_Actual_Type (T2) |
7712 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 7713 | |
8fde064e | 7714 | -- If T2 is a generic actual type it is declared as the subtype of |
2995860f AC |
7715 | -- the actual. If that actual is itself a subtype we need to use its |
7716 | -- own base type to check for compatibility. | |
8fde064e AC |
7717 | |
7718 | elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then | |
7719 | return True; | |
7720 | ||
7721 | elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then | |
7722 | return True; | |
7723 | ||
0a36105d JM |
7724 | else |
7725 | return False; | |
7726 | end if; | |
7727 | end Base_Types_Match; | |
aa720a54 | 7728 | |
5d37ba92 ES |
7729 | -------------------------- |
7730 | -- Find_Designated_Type -- | |
7731 | -------------------------- | |
7732 | ||
7733 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
7734 | Desig : Entity_Id; | |
7735 | ||
7736 | begin | |
7737 | Desig := Directly_Designated_Type (T); | |
7738 | ||
7739 | if Ekind (Desig) = E_Incomplete_Type then | |
7740 | ||
7741 | -- If regular incomplete type, get full view if available | |
7742 | ||
7743 | if Present (Full_View (Desig)) then | |
7744 | Desig := Full_View (Desig); | |
7745 | ||
7746 | -- If limited view of a type, get non-limited view if available, | |
7747 | -- and check again for a regular incomplete type. | |
7748 | ||
7749 | elsif Present (Non_Limited_View (Desig)) then | |
7750 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
7751 | end if; | |
7752 | end if; | |
7753 | ||
7754 | return Desig; | |
7755 | end Find_Designated_Type; | |
7756 | ||
0a36105d JM |
7757 | ------------------------------- |
7758 | -- Matches_Limited_With_View -- | |
7759 | ------------------------------- | |
7760 | ||
7761 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
7762 | begin | |
7763 | -- In some cases a type imported through a limited_with clause, and | |
7764 | -- its nonlimited view are both visible, for example in an anonymous | |
7765 | -- access-to-class-wide type in a formal. Both entities designate the | |
7766 | -- same type. | |
7767 | ||
7b56a91b | 7768 | if From_Limited_With (T1) and then T2 = Available_View (T1) then |
aa720a54 AC |
7769 | return True; |
7770 | ||
7b56a91b | 7771 | elsif From_Limited_With (T2) and then T1 = Available_View (T2) then |
41251c60 | 7772 | return True; |
3e24afaa | 7773 | |
7b56a91b AC |
7774 | elsif From_Limited_With (T1) |
7775 | and then From_Limited_With (T2) | |
3e24afaa AC |
7776 | and then Available_View (T1) = Available_View (T2) |
7777 | then | |
7778 | return True; | |
41251c60 | 7779 | |
996ae0b0 RK |
7780 | else |
7781 | return False; | |
7782 | end if; | |
0a36105d | 7783 | end Matches_Limited_With_View; |
996ae0b0 | 7784 | |
ec4867fa | 7785 | -- Start of processing for Conforming_Types |
758c442c | 7786 | |
996ae0b0 | 7787 | begin |
8fde064e AC |
7788 | -- The context is an instance association for a formal access-to- |
7789 | -- subprogram type; the formal parameter types require mapping because | |
7790 | -- they may denote other formal parameters of the generic unit. | |
996ae0b0 RK |
7791 | |
7792 | if Get_Inst then | |
7793 | Type_1 := Get_Instance_Of (T1); | |
7794 | Type_2 := Get_Instance_Of (T2); | |
7795 | end if; | |
7796 | ||
0a36105d JM |
7797 | -- If one of the types is a view of the other introduced by a limited |
7798 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 7799 | |
0a36105d JM |
7800 | if Matches_Limited_With_View (T1, T2) then |
7801 | return True; | |
7802 | ||
7803 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
7804 | return Ctype <= Mode_Conformant |
7805 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
7806 | ||
7807 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
7808 | and then Present (Full_View (Type_1)) | |
7809 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
7810 | then | |
7811 | return Ctype <= Mode_Conformant | |
7812 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
7813 | ||
7814 | elsif Ekind (Type_2) = E_Incomplete_Type | |
7815 | and then Present (Full_View (Type_2)) | |
7816 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7817 | then | |
7818 | return Ctype <= Mode_Conformant | |
7819 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
7820 | |
7821 | elsif Is_Private_Type (Type_2) | |
7822 | and then In_Instance | |
7823 | and then Present (Full_View (Type_2)) | |
7824 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7825 | then | |
7826 | return Ctype <= Mode_Conformant | |
7827 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
996ae0b0 RK |
7828 | end if; |
7829 | ||
0a36105d | 7830 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
466c2127 AC |
7831 | -- treated recursively because they carry a signature. As far as |
7832 | -- conformance is concerned, convention plays no role, and either | |
7833 | -- or both could be access to protected subprograms. | |
af4b9434 AC |
7834 | |
7835 | Are_Anonymous_Access_To_Subprogram_Types := | |
466c2127 AC |
7836 | Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
7837 | E_Anonymous_Access_Protected_Subprogram_Type) | |
f937473f | 7838 | and then |
466c2127 AC |
7839 | Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
7840 | E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 7841 | |
996ae0b0 | 7842 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
7843 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
7844 | -- the base types because we may have built internal subtype entities | |
7845 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 7846 | |
5d37ba92 ES |
7847 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
7848 | and then | |
7849 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
8fde064e AC |
7850 | |
7851 | -- Ada 2005 (AI-254) | |
7852 | ||
7853 | or else Are_Anonymous_Access_To_Subprogram_Types | |
996ae0b0 RK |
7854 | then |
7855 | declare | |
7856 | Desig_1 : Entity_Id; | |
7857 | Desig_2 : Entity_Id; | |
7858 | ||
7859 | begin | |
885c4871 | 7860 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 7861 | -- subtype conformance. |
9dcb52e1 | 7862 | |
0791fbe9 | 7863 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
7864 | and then Ctype >= Subtype_Conformant |
7865 | and then | |
7866 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
7867 | then | |
7868 | return False; | |
996ae0b0 RK |
7869 | end if; |
7870 | ||
5d37ba92 | 7871 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 7872 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 7873 | |
5d37ba92 | 7874 | -- If the context is an instance association for a formal |
82c80734 RD |
7875 | -- access-to-subprogram type; formal access parameter designated |
7876 | -- types require mapping because they may denote other formal | |
7877 | -- parameters of the generic unit. | |
996ae0b0 RK |
7878 | |
7879 | if Get_Inst then | |
7880 | Desig_1 := Get_Instance_Of (Desig_1); | |
7881 | Desig_2 := Get_Instance_Of (Desig_2); | |
7882 | end if; | |
7883 | ||
82c80734 RD |
7884 | -- It is possible for a Class_Wide_Type to be introduced for an |
7885 | -- incomplete type, in which case there is a separate class_ wide | |
7886 | -- type for the full view. The types conform if their Etypes | |
7887 | -- conform, i.e. one may be the full view of the other. This can | |
7888 | -- only happen in the context of an access parameter, other uses | |
7889 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 7890 | |
fbf5a39b | 7891 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
7892 | and then |
7893 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
7894 | then |
7895 | return | |
fbf5a39b AC |
7896 | Conforming_Types |
7897 | (Etype (Base_Type (Desig_1)), | |
7898 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
7899 | |
7900 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 7901 | if Ada_Version < Ada_2005 then |
758c442c GD |
7902 | return Ctype = Type_Conformant |
7903 | or else | |
af4b9434 AC |
7904 | Subtypes_Statically_Match (Desig_1, Desig_2); |
7905 | ||
758c442c GD |
7906 | -- We must check the conformance of the signatures themselves |
7907 | ||
7908 | else | |
7909 | declare | |
7910 | Conformant : Boolean; | |
7911 | begin | |
7912 | Check_Conformance | |
7913 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
7914 | return Conformant; | |
7915 | end; | |
7916 | end if; | |
7917 | ||
996ae0b0 RK |
7918 | else |
7919 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
7920 | and then (Ctype = Type_Conformant | |
8fde064e AC |
7921 | or else |
7922 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
7923 | end if; |
7924 | end; | |
7925 | ||
7926 | -- Otherwise definitely no match | |
7927 | ||
7928 | else | |
c8ef728f ES |
7929 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
7930 | and then Is_Access_Type (Type_2)) | |
7931 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
8fde064e | 7932 | and then Is_Access_Type (Type_1))) |
c8ef728f ES |
7933 | and then |
7934 | Conforming_Types | |
7935 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
7936 | then | |
7937 | May_Hide_Profile := True; | |
7938 | end if; | |
7939 | ||
996ae0b0 RK |
7940 | return False; |
7941 | end if; | |
996ae0b0 RK |
7942 | end Conforming_Types; |
7943 | ||
7944 | -------------------------- | |
7945 | -- Create_Extra_Formals -- | |
7946 | -------------------------- | |
7947 | ||
7948 | procedure Create_Extra_Formals (E : Entity_Id) is | |
7949 | Formal : Entity_Id; | |
ec4867fa | 7950 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
7951 | Last_Extra : Entity_Id; |
7952 | Formal_Type : Entity_Id; | |
7953 | P_Formal : Entity_Id := Empty; | |
7954 | ||
ec4867fa ES |
7955 | function Add_Extra_Formal |
7956 | (Assoc_Entity : Entity_Id; | |
7957 | Typ : Entity_Id; | |
7958 | Scope : Entity_Id; | |
7959 | Suffix : String) return Entity_Id; | |
7960 | -- Add an extra formal to the current list of formals and extra formals. | |
7961 | -- The extra formal is added to the end of the list of extra formals, | |
7962 | -- and also returned as the result. These formals are always of mode IN. | |
7963 | -- The new formal has the type Typ, is declared in Scope, and its name | |
7964 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
7965 | -- The following suffixes are currently used. They should not be changed |
7966 | -- without coordinating with CodePeer, which makes use of these to | |
7967 | -- provide better messages. | |
7968 | ||
d92eccc3 AC |
7969 | -- O denotes the Constrained bit. |
7970 | -- L denotes the accessibility level. | |
cd5a9750 AC |
7971 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
7972 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 7973 | |
fbf5a39b AC |
7974 | ---------------------- |
7975 | -- Add_Extra_Formal -- | |
7976 | ---------------------- | |
7977 | ||
ec4867fa ES |
7978 | function Add_Extra_Formal |
7979 | (Assoc_Entity : Entity_Id; | |
7980 | Typ : Entity_Id; | |
7981 | Scope : Entity_Id; | |
7982 | Suffix : String) return Entity_Id | |
7983 | is | |
996ae0b0 | 7984 | EF : constant Entity_Id := |
ec4867fa ES |
7985 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
7986 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 7987 | Suffix => Suffix)); |
996ae0b0 RK |
7988 | |
7989 | begin | |
82c80734 RD |
7990 | -- A little optimization. Never generate an extra formal for the |
7991 | -- _init operand of an initialization procedure, since it could | |
7992 | -- never be used. | |
996ae0b0 RK |
7993 | |
7994 | if Chars (Formal) = Name_uInit then | |
7995 | return Empty; | |
7996 | end if; | |
7997 | ||
7998 | Set_Ekind (EF, E_In_Parameter); | |
7999 | Set_Actual_Subtype (EF, Typ); | |
8000 | Set_Etype (EF, Typ); | |
ec4867fa | 8001 | Set_Scope (EF, Scope); |
996ae0b0 RK |
8002 | Set_Mechanism (EF, Default_Mechanism); |
8003 | Set_Formal_Validity (EF); | |
8004 | ||
ec4867fa ES |
8005 | if No (First_Extra) then |
8006 | First_Extra := EF; | |
8007 | Set_Extra_Formals (Scope, First_Extra); | |
8008 | end if; | |
8009 | ||
8010 | if Present (Last_Extra) then | |
8011 | Set_Extra_Formal (Last_Extra, EF); | |
8012 | end if; | |
8013 | ||
996ae0b0 | 8014 | Last_Extra := EF; |
ec4867fa | 8015 | |
996ae0b0 RK |
8016 | return EF; |
8017 | end Add_Extra_Formal; | |
8018 | ||
8019 | -- Start of processing for Create_Extra_Formals | |
8020 | ||
8021 | begin | |
8fde064e AC |
8022 | -- We never generate extra formals if expansion is not active because we |
8023 | -- don't need them unless we are generating code. | |
f937473f RD |
8024 | |
8025 | if not Expander_Active then | |
8026 | return; | |
8027 | end if; | |
8028 | ||
e2441021 AC |
8029 | -- No need to generate extra formals in interface thunks whose target |
8030 | -- primitive has no extra formals. | |
8031 | ||
8032 | if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then | |
8033 | return; | |
8034 | end if; | |
8035 | ||
82c80734 | 8036 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 8037 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 8038 | -- for extra formals. |
996ae0b0 RK |
8039 | |
8040 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
8041 | P_Formal := First_Formal (Alias (E)); | |
8042 | end if; | |
8043 | ||
8044 | Last_Extra := Empty; | |
8045 | Formal := First_Formal (E); | |
8046 | while Present (Formal) loop | |
8047 | Last_Extra := Formal; | |
8048 | Next_Formal (Formal); | |
8049 | end loop; | |
8050 | ||
f937473f | 8051 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
8052 | -- situation may arise for subprogram types created as part of |
8053 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 | 8054 | |
8fde064e | 8055 | if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
996ae0b0 RK |
8056 | return; |
8057 | end if; | |
8058 | ||
19590d70 GD |
8059 | -- If the subprogram is a predefined dispatching subprogram then don't |
8060 | -- generate any extra constrained or accessibility level formals. In | |
8061 | -- general we suppress these for internal subprograms (by not calling | |
8062 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
8063 | -- generated stream attributes do get passed through because extra | |
8064 | -- build-in-place formals are needed in some cases (limited 'Input). | |
8065 | ||
bac7206d | 8066 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 8067 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
8068 | end if; |
8069 | ||
996ae0b0 | 8070 | Formal := First_Formal (E); |
996ae0b0 RK |
8071 | while Present (Formal) loop |
8072 | ||
8073 | -- Create extra formal for supporting the attribute 'Constrained. | |
8074 | -- The case of a private type view without discriminants also | |
8075 | -- requires the extra formal if the underlying type has defaulted | |
8076 | -- discriminants. | |
8077 | ||
8078 | if Ekind (Formal) /= E_In_Parameter then | |
8079 | if Present (P_Formal) then | |
8080 | Formal_Type := Etype (P_Formal); | |
8081 | else | |
8082 | Formal_Type := Etype (Formal); | |
8083 | end if; | |
8084 | ||
5d09245e AC |
8085 | -- Do not produce extra formals for Unchecked_Union parameters. |
8086 | -- Jump directly to the end of the loop. | |
8087 | ||
8088 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
8089 | goto Skip_Extra_Formal_Generation; | |
8090 | end if; | |
8091 | ||
996ae0b0 RK |
8092 | if not Has_Discriminants (Formal_Type) |
8093 | and then Ekind (Formal_Type) in Private_Kind | |
8094 | and then Present (Underlying_Type (Formal_Type)) | |
8095 | then | |
8096 | Formal_Type := Underlying_Type (Formal_Type); | |
8097 | end if; | |
8098 | ||
5e5db3b4 GD |
8099 | -- Suppress the extra formal if formal's subtype is constrained or |
8100 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
8101 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
8102 | -- can have defaulted discriminants, but 'Constrained is required | |
8103 | -- to return True, so the formal is never needed (see AI05-0214). | |
8104 | -- Note that this ensures consistency of calling sequences for | |
8105 | -- dispatching operations when some types in a class have defaults | |
8106 | -- on discriminants and others do not (and requiring the extra | |
8107 | -- formal would introduce distributed overhead). | |
8108 | ||
b5bdffcc AC |
8109 | -- If the type does not have a completion yet, treat as prior to |
8110 | -- Ada 2012 for consistency. | |
8111 | ||
996ae0b0 | 8112 | if Has_Discriminants (Formal_Type) |
f937473f RD |
8113 | and then not Is_Constrained (Formal_Type) |
8114 | and then not Is_Indefinite_Subtype (Formal_Type) | |
5e5db3b4 | 8115 | and then (Ada_Version < Ada_2012 |
b5bdffcc AC |
8116 | or else No (Underlying_Type (Formal_Type)) |
8117 | or else not | |
8118 | (Is_Limited_Type (Formal_Type) | |
8119 | and then | |
8120 | (Is_Tagged_Type | |
8121 | (Underlying_Type (Formal_Type))))) | |
996ae0b0 RK |
8122 | then |
8123 | Set_Extra_Constrained | |
d92eccc3 | 8124 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
8125 | end if; |
8126 | end if; | |
8127 | ||
0a36105d JM |
8128 | -- Create extra formal for supporting accessibility checking. This |
8129 | -- is done for both anonymous access formals and formals of named | |
8130 | -- access types that are marked as controlling formals. The latter | |
8131 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
8132 | -- type and substitutes the types of access-to-class-wide actuals | |
8133 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
8134 | -- Base_Type is applied because in cases where there is a null |
8135 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
8136 | |
8137 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 8138 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
8139 | -- package in which it resides. However, we do not suppress it |
8140 | -- simply if the scope has accessibility checks suppressed, since | |
8141 | -- this could cause trouble when clients are compiled with a | |
8142 | -- different suppression setting. The explicit checks at the | |
8143 | -- package level are safe from this point of view. | |
996ae0b0 | 8144 | |
5d37ba92 | 8145 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 8146 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 8147 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 8148 | and then not |
fbf5a39b | 8149 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 8150 | or else |
fbf5a39b | 8151 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 8152 | and then |
c8ef728f | 8153 | (No (P_Formal) |
996ae0b0 RK |
8154 | or else Present (Extra_Accessibility (P_Formal))) |
8155 | then | |
811c6a85 | 8156 | Set_Extra_Accessibility |
d92eccc3 | 8157 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
8158 | end if; |
8159 | ||
5d09245e AC |
8160 | -- This label is required when skipping extra formal generation for |
8161 | -- Unchecked_Union parameters. | |
8162 | ||
8163 | <<Skip_Extra_Formal_Generation>> | |
8164 | ||
f937473f RD |
8165 | if Present (P_Formal) then |
8166 | Next_Formal (P_Formal); | |
8167 | end if; | |
8168 | ||
996ae0b0 RK |
8169 | Next_Formal (Formal); |
8170 | end loop; | |
ec4867fa | 8171 | |
63585f75 SB |
8172 | <<Test_For_Func_Result_Extras>> |
8173 | ||
8174 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
8175 | -- function call is ... determined by the point of call ...". | |
8176 | ||
8177 | if Needs_Result_Accessibility_Level (E) then | |
8178 | Set_Extra_Accessibility_Of_Result | |
8179 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
8180 | end if; | |
19590d70 | 8181 | |
ec4867fa | 8182 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
8183 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
8184 | ||
0791fbe9 | 8185 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 8186 | declare |
f937473f | 8187 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 8188 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 8189 | Formal_Typ : Entity_Id; |
f937473f | 8190 | |
2fcc44fa | 8191 | Discard : Entity_Id; |
f937473f | 8192 | pragma Warnings (Off, Discard); |
ec4867fa ES |
8193 | |
8194 | begin | |
f937473f | 8195 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
8196 | -- add a 4-state formal indicating whether the return object is |
8197 | -- allocated by the caller (1), or should be allocated by the | |
8198 | -- callee on the secondary stack (2), in the global heap (3), or | |
8199 | -- in a user-defined storage pool (4). For the moment we just use | |
8200 | -- Natural for the type of this formal. Note that this formal | |
8201 | -- isn't usually needed in the case where the result subtype is | |
8202 | -- constrained, but it is needed when the function has a tagged | |
8203 | -- result, because generally such functions can be called in a | |
8204 | -- dispatching context and such calls must be handled like calls | |
8205 | -- to a class-wide function. | |
0a36105d | 8206 | |
1bb6e262 | 8207 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
8208 | Discard := |
8209 | Add_Extra_Formal | |
8210 | (E, Standard_Natural, | |
8211 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 8212 | |
8417f4b2 | 8213 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 AC |
8214 | -- use a user-defined pool. This formal is not added on |
8215 | -- .NET/JVM/ZFP as those targets do not support pools. | |
200b7162 | 8216 | |
ea10ca9c AC |
8217 | if VM_Target = No_VM |
8218 | and then RTE_Available (RE_Root_Storage_Pool_Ptr) | |
3e452820 | 8219 | then |
8417f4b2 AC |
8220 | Discard := |
8221 | Add_Extra_Formal | |
8222 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
8223 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
8224 | end if; | |
f937473f | 8225 | end if; |
ec4867fa | 8226 | |
df3e68b1 | 8227 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 8228 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 8229 | |
ca5af305 | 8230 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
8231 | Discard := |
8232 | Add_Extra_Formal | |
ca5af305 AC |
8233 | (E, RTE (RE_Finalization_Master_Ptr), |
8234 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
8235 | end if; |
8236 | ||
94bbf008 AC |
8237 | -- When the result type contains tasks, add two extra formals: the |
8238 | -- master of the tasks to be created, and the caller's activation | |
8239 | -- chain. | |
f937473f | 8240 | |
1a36a0cd | 8241 | if Has_Task (Full_Subt) then |
f937473f RD |
8242 | Discard := |
8243 | Add_Extra_Formal | |
8244 | (E, RTE (RE_Master_Id), | |
af89615f | 8245 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
8246 | Discard := |
8247 | Add_Extra_Formal | |
8248 | (E, RTE (RE_Activation_Chain_Access), | |
8249 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
8250 | end if; | |
ec4867fa | 8251 | |
f937473f RD |
8252 | -- All build-in-place functions get an extra formal that will be |
8253 | -- passed the address of the return object within the caller. | |
ec4867fa | 8254 | |
1a36a0cd AC |
8255 | Formal_Typ := |
8256 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 8257 | |
1a36a0cd AC |
8258 | Set_Directly_Designated_Type (Formal_Typ, Result_Subt); |
8259 | Set_Etype (Formal_Typ, Formal_Typ); | |
8260 | Set_Depends_On_Private | |
8261 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
8262 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
8263 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 8264 | |
1a36a0cd AC |
8265 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
8266 | -- the designated type comes from the limited view (for back-end | |
8267 | -- purposes). | |
ec4867fa | 8268 | |
7b56a91b AC |
8269 | Set_From_Limited_With |
8270 | (Formal_Typ, From_Limited_With (Result_Subt)); | |
f937473f | 8271 | |
1a36a0cd AC |
8272 | Layout_Type (Formal_Typ); |
8273 | ||
8274 | Discard := | |
8275 | Add_Extra_Formal | |
8276 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
8277 | end; |
8278 | end if; | |
996ae0b0 RK |
8279 | end Create_Extra_Formals; |
8280 | ||
8281 | ----------------------------- | |
8282 | -- Enter_Overloaded_Entity -- | |
8283 | ----------------------------- | |
8284 | ||
8285 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
8286 | E : Entity_Id := Current_Entity_In_Scope (S); | |
8287 | C_E : Entity_Id := Current_Entity (S); | |
8288 | ||
8289 | begin | |
8290 | if Present (E) then | |
8291 | Set_Has_Homonym (E); | |
8292 | Set_Has_Homonym (S); | |
8293 | end if; | |
8294 | ||
8295 | Set_Is_Immediately_Visible (S); | |
8296 | Set_Scope (S, Current_Scope); | |
8297 | ||
8298 | -- Chain new entity if front of homonym in current scope, so that | |
8299 | -- homonyms are contiguous. | |
8300 | ||
8fde064e | 8301 | if Present (E) and then E /= C_E then |
996ae0b0 RK |
8302 | while Homonym (C_E) /= E loop |
8303 | C_E := Homonym (C_E); | |
8304 | end loop; | |
8305 | ||
8306 | Set_Homonym (C_E, S); | |
8307 | ||
8308 | else | |
8309 | E := C_E; | |
8310 | Set_Current_Entity (S); | |
8311 | end if; | |
8312 | ||
8313 | Set_Homonym (S, E); | |
8314 | ||
2352eadb AC |
8315 | if Is_Inherited_Operation (S) then |
8316 | Append_Inherited_Subprogram (S); | |
8317 | else | |
8318 | Append_Entity (S, Current_Scope); | |
8319 | end if; | |
8320 | ||
996ae0b0 RK |
8321 | Set_Public_Status (S); |
8322 | ||
8323 | if Debug_Flag_E then | |
8324 | Write_Str ("New overloaded entity chain: "); | |
8325 | Write_Name (Chars (S)); | |
996ae0b0 | 8326 | |
82c80734 | 8327 | E := S; |
996ae0b0 RK |
8328 | while Present (E) loop |
8329 | Write_Str (" "); Write_Int (Int (E)); | |
8330 | E := Homonym (E); | |
8331 | end loop; | |
8332 | ||
8333 | Write_Eol; | |
8334 | end if; | |
8335 | ||
8336 | -- Generate warning for hiding | |
8337 | ||
8338 | if Warn_On_Hiding | |
8339 | and then Comes_From_Source (S) | |
8340 | and then In_Extended_Main_Source_Unit (S) | |
8341 | then | |
8342 | E := S; | |
8343 | loop | |
8344 | E := Homonym (E); | |
8345 | exit when No (E); | |
8346 | ||
7fc53871 AC |
8347 | -- Warn unless genuine overloading. Do not emit warning on |
8348 | -- hiding predefined operators in Standard (these are either an | |
8349 | -- (artifact of our implicit declarations, or simple noise) but | |
8350 | -- keep warning on a operator defined on a local subtype, because | |
8351 | -- of the real danger that different operators may be applied in | |
8352 | -- various parts of the program. | |
996ae0b0 | 8353 | |
1f250383 AC |
8354 | -- Note that if E and S have the same scope, there is never any |
8355 | -- hiding. Either the two conflict, and the program is illegal, | |
8356 | -- or S is overriding an implicit inherited subprogram. | |
8357 | ||
8358 | if Scope (E) /= Scope (S) | |
8359 | and then (not Is_Overloadable (E) | |
8d606a78 | 8360 | or else Subtype_Conformant (E, S)) |
f937473f RD |
8361 | and then (Is_Immediately_Visible (E) |
8362 | or else | |
8363 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 8364 | then |
7fc53871 AC |
8365 | if Scope (E) /= Standard_Standard then |
8366 | Error_Msg_Sloc := Sloc (E); | |
dbfeb4fa | 8367 | Error_Msg_N ("declaration of & hides one#?h?", S); |
7fc53871 AC |
8368 | |
8369 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
8370 | and then | |
1f250383 | 8371 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
8372 | then |
8373 | Error_Msg_N | |
dbfeb4fa | 8374 | ("declaration of & hides predefined operator?h?", S); |
7fc53871 | 8375 | end if; |
996ae0b0 RK |
8376 | end if; |
8377 | end loop; | |
8378 | end if; | |
8379 | end Enter_Overloaded_Entity; | |
8380 | ||
e5a58fac AC |
8381 | ----------------------------- |
8382 | -- Check_Untagged_Equality -- | |
8383 | ----------------------------- | |
8384 | ||
8385 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
8386 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
8387 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
8388 | Obj_Decl : Node_Id; | |
8389 | ||
8390 | begin | |
b2834fbd AC |
8391 | -- This check applies only if we have a subprogram declaration with a |
8392 | -- non-tagged record type. | |
8393 | ||
8394 | if Nkind (Decl) /= N_Subprogram_Declaration | |
8395 | or else not Is_Record_Type (Typ) | |
8396 | or else Is_Tagged_Type (Typ) | |
e5a58fac | 8397 | then |
b2834fbd AC |
8398 | return; |
8399 | end if; | |
e5a58fac | 8400 | |
b2834fbd AC |
8401 | -- In Ada 2012 case, we will output errors or warnings depending on |
8402 | -- the setting of debug flag -gnatd.E. | |
8403 | ||
8404 | if Ada_Version >= Ada_2012 then | |
8405 | Error_Msg_Warn := Debug_Flag_Dot_EE; | |
8406 | ||
8407 | -- In earlier versions of Ada, nothing to do unless we are warning on | |
8408 | -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). | |
8409 | ||
8410 | else | |
8411 | if not Warn_On_Ada_2012_Compatibility then | |
8412 | return; | |
8413 | end if; | |
8414 | end if; | |
8415 | ||
8416 | -- Cases where the type has already been frozen | |
e5a58fac | 8417 | |
b2834fbd AC |
8418 | if Is_Frozen (Typ) then |
8419 | ||
8420 | -- If the type is not declared in a package, or if we are in the body | |
8421 | -- of the package or in some other scope, the new operation is not | |
8422 | -- primitive, and therefore legal, though suspicious. Should we | |
8423 | -- generate a warning in this case ??? | |
8424 | ||
8425 | if Ekind (Scope (Typ)) /= E_Package | |
8426 | or else Scope (Typ) /= Current_Scope | |
8427 | then | |
8428 | return; | |
8429 | ||
8430 | -- If the type is a generic actual (sub)type, the operation is not | |
8431 | -- primitive either because the base type is declared elsewhere. | |
8432 | ||
8433 | elsif Is_Generic_Actual_Type (Typ) then | |
8434 | return; | |
8435 | ||
8436 | -- Here we have a definite error of declaration after freezing | |
8437 | ||
8438 | else | |
8439 | if Ada_Version >= Ada_2012 then | |
ae6ede77 | 8440 | Error_Msg_NE |
b2834fbd AC |
8441 | ("equality operator must be declared before type& is " |
8442 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); | |
8443 | ||
8444 | -- In Ada 2012 mode with error turned to warning, output one | |
8445 | -- more warning to warn that the equality operation may not | |
8446 | -- compose. This is the consequence of ignoring the error. | |
8447 | ||
8448 | if Error_Msg_Warn then | |
8449 | Error_Msg_N ("\equality operation may not compose??", Eq_Op); | |
8450 | end if; | |
21a5b575 AC |
8451 | |
8452 | else | |
8453 | Error_Msg_NE | |
b2834fbd AC |
8454 | ("equality operator must be declared before type& is " |
8455 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); | |
8456 | end if; | |
8457 | ||
8458 | -- If we are in the package body, we could just move the | |
8459 | -- declaration to the package spec, so add a message saying that. | |
8460 | ||
8461 | if In_Package_Body (Scope (Typ)) then | |
8462 | if Ada_Version >= Ada_2012 then | |
8463 | Error_Msg_N | |
8464 | ("\move declaration to package spec<<", Eq_Op); | |
8465 | else | |
8466 | Error_Msg_N | |
8467 | ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); | |
8468 | end if; | |
21a5b575 | 8469 | |
b2834fbd AC |
8470 | -- Otherwise try to find the freezing point |
8471 | ||
8472 | else | |
21a5b575 | 8473 | Obj_Decl := Next (Parent (Typ)); |
dbfeb4fa | 8474 | while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
21a5b575 AC |
8475 | if Nkind (Obj_Decl) = N_Object_Declaration |
8476 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
8477 | then | |
b2834fbd AC |
8478 | -- Freezing point, output warnings |
8479 | ||
8480 | if Ada_Version >= Ada_2012 then | |
8481 | Error_Msg_NE | |
8482 | ("type& is frozen by declaration??", Obj_Decl, Typ); | |
8483 | Error_Msg_N | |
8484 | ("\an equality operator cannot be declared after " | |
8485 | & "this point??", | |
8486 | Obj_Decl); | |
8487 | else | |
8488 | Error_Msg_NE | |
8489 | ("type& is frozen by declaration (Ada 2012)?y?", | |
8490 | Obj_Decl, Typ); | |
8491 | Error_Msg_N | |
8492 | ("\an equality operator cannot be declared after " | |
8493 | & "this point (Ada 2012)?y?", | |
8494 | Obj_Decl); | |
8495 | end if; | |
8496 | ||
21a5b575 AC |
8497 | exit; |
8498 | end if; | |
8499 | ||
8500 | Next (Obj_Decl); | |
8501 | end loop; | |
8502 | end if; | |
b2834fbd | 8503 | end if; |
e5a58fac | 8504 | |
b2834fbd AC |
8505 | -- Here if type is not frozen yet. It is illegal to have a primitive |
8506 | -- equality declared in the private part if the type is visible. | |
21a5b575 | 8507 | |
b2834fbd AC |
8508 | elsif not In_Same_List (Parent (Typ), Decl) |
8509 | and then not Is_Limited_Type (Typ) | |
8510 | then | |
8511 | -- Shouldn't we give an RM reference here??? | |
21a5b575 | 8512 | |
b2834fbd AC |
8513 | if Ada_Version >= Ada_2012 then |
8514 | Error_Msg_N | |
8515 | ("equality operator appears too late<<", Eq_Op); | |
8516 | else | |
8517 | Error_Msg_N | |
8518 | ("equality operator appears too late (Ada 2012)?y?", Eq_Op); | |
e5a58fac | 8519 | end if; |
b2834fbd AC |
8520 | |
8521 | -- No error detected | |
8522 | ||
8523 | else | |
8524 | return; | |
e5a58fac AC |
8525 | end if; |
8526 | end Check_Untagged_Equality; | |
8527 | ||
996ae0b0 RK |
8528 | ----------------------------- |
8529 | -- Find_Corresponding_Spec -- | |
8530 | ----------------------------- | |
8531 | ||
d44202ba HK |
8532 | function Find_Corresponding_Spec |
8533 | (N : Node_Id; | |
8534 | Post_Error : Boolean := True) return Entity_Id | |
8535 | is | |
996ae0b0 RK |
8536 | Spec : constant Node_Id := Specification (N); |
8537 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
8538 | ||
8539 | E : Entity_Id; | |
8540 | ||
70f4ad20 AC |
8541 | function Different_Generic_Profile (E : Entity_Id) return Boolean; |
8542 | -- Even if fully conformant, a body may depend on a generic actual when | |
8543 | -- the spec does not, or vice versa, in which case they were distinct | |
8544 | -- entities in the generic. | |
8545 | ||
8546 | ------------------------------- | |
8547 | -- Different_Generic_Profile -- | |
8548 | ------------------------------- | |
8549 | ||
8550 | function Different_Generic_Profile (E : Entity_Id) return Boolean is | |
8551 | F1, F2 : Entity_Id; | |
8552 | ||
2995860f AC |
8553 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
8554 | -- Check that the types of corresponding formals have the same | |
8555 | -- generic actual if any. We have to account for subtypes of a | |
8556 | -- generic formal, declared between a spec and a body, which may | |
8557 | -- appear distinct in an instance but matched in the generic. | |
8558 | ||
8559 | ------------------------- | |
8560 | -- Same_Generic_Actual -- | |
8561 | ------------------------- | |
8562 | ||
8563 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is | |
8564 | begin | |
8565 | return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) | |
8566 | or else | |
8567 | (Present (Parent (T1)) | |
8568 | and then Comes_From_Source (Parent (T1)) | |
8569 | and then Nkind (Parent (T1)) = N_Subtype_Declaration | |
8570 | and then Is_Entity_Name (Subtype_Indication (Parent (T1))) | |
8571 | and then Entity (Subtype_Indication (Parent (T1))) = T2); | |
8572 | end Same_Generic_Actual; | |
8573 | ||
8574 | -- Start of processing for Different_Generic_Profile | |
8575 | ||
70f4ad20 | 8576 | begin |
2995860f AC |
8577 | if not In_Instance then |
8578 | return False; | |
8579 | ||
8580 | elsif Ekind (E) = E_Function | |
8581 | and then not Same_Generic_Actual (Etype (E), Etype (Designator)) | |
70f4ad20 AC |
8582 | then |
8583 | return True; | |
8584 | end if; | |
8585 | ||
8586 | F1 := First_Formal (Designator); | |
8587 | F2 := First_Formal (E); | |
70f4ad20 | 8588 | while Present (F1) loop |
2995860f | 8589 | if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
70f4ad20 AC |
8590 | return True; |
8591 | end if; | |
8592 | ||
8593 | Next_Formal (F1); | |
8594 | Next_Formal (F2); | |
8595 | end loop; | |
8596 | ||
8597 | return False; | |
8598 | end Different_Generic_Profile; | |
8599 | ||
8600 | -- Start of processing for Find_Corresponding_Spec | |
8601 | ||
996ae0b0 RK |
8602 | begin |
8603 | E := Current_Entity (Designator); | |
996ae0b0 RK |
8604 | while Present (E) loop |
8605 | ||
8606 | -- We are looking for a matching spec. It must have the same scope, | |
8607 | -- and the same name, and either be type conformant, or be the case | |
8608 | -- of a library procedure spec and its body (which belong to one | |
8609 | -- another regardless of whether they are type conformant or not). | |
8610 | ||
8611 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
8612 | if Current_Scope = Standard_Standard |
8613 | or else (Ekind (E) = Ekind (Designator) | |
586ecbf3 | 8614 | and then Type_Conformant (E, Designator)) |
996ae0b0 RK |
8615 | then |
8616 | -- Within an instantiation, we know that spec and body are | |
70f4ad20 AC |
8617 | -- subtype conformant, because they were subtype conformant in |
8618 | -- the generic. We choose the subtype-conformant entity here as | |
8619 | -- well, to resolve spurious ambiguities in the instance that | |
8620 | -- were not present in the generic (i.e. when two different | |
8621 | -- types are given the same actual). If we are looking for a | |
8622 | -- spec to match a body, full conformance is expected. | |
996ae0b0 RK |
8623 | |
8624 | if In_Instance then | |
8625 | Set_Convention (Designator, Convention (E)); | |
8626 | ||
0187b60e AC |
8627 | -- Skip past subprogram bodies and subprogram renamings that |
8628 | -- may appear to have a matching spec, but that aren't fully | |
8629 | -- conformant with it. That can occur in cases where an | |
8630 | -- actual type causes unrelated homographs in the instance. | |
8631 | ||
8632 | if Nkind_In (N, N_Subprogram_Body, | |
8633 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 8634 | and then Present (Homonym (E)) |
c7b9d548 | 8635 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
8636 | then |
8637 | goto Next_Entity; | |
8638 | ||
c7b9d548 | 8639 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 | 8640 | goto Next_Entity; |
70f4ad20 AC |
8641 | |
8642 | elsif Different_Generic_Profile (E) then | |
8643 | goto Next_Entity; | |
996ae0b0 RK |
8644 | end if; |
8645 | end if; | |
8646 | ||
25ebc085 AC |
8647 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
8648 | -- null procedures locate the internally generated spec. We | |
8649 | -- enforce mode conformance since a tagged type may inherit | |
8650 | -- from interfaces several null primitives which differ only | |
8651 | -- in the mode of the formals. | |
8652 | ||
8653 | if not (Comes_From_Source (E)) | |
8654 | and then Is_Null_Procedure (E) | |
8655 | and then not Mode_Conformant (Designator, E) | |
8656 | then | |
8657 | null; | |
8658 | ||
4d8f3296 ES |
8659 | -- For null procedures coming from source that are completions, |
8660 | -- analysis of the generated body will establish the link. | |
8661 | ||
8662 | elsif Comes_From_Source (E) | |
8663 | and then Nkind (Spec) = N_Procedure_Specification | |
8664 | and then Null_Present (Spec) | |
8665 | then | |
8666 | return E; | |
8667 | ||
25ebc085 | 8668 | elsif not Has_Completion (E) then |
996ae0b0 RK |
8669 | if Nkind (N) /= N_Subprogram_Body_Stub then |
8670 | Set_Corresponding_Spec (N, E); | |
8671 | end if; | |
8672 | ||
8673 | Set_Has_Completion (E); | |
8674 | return E; | |
8675 | ||
8676 | elsif Nkind (Parent (N)) = N_Subunit then | |
8677 | ||
8678 | -- If this is the proper body of a subunit, the completion | |
8679 | -- flag is set when analyzing the stub. | |
8680 | ||
8681 | return E; | |
8682 | ||
70f4ad20 AC |
8683 | -- If E is an internal function with a controlling result that |
8684 | -- was created for an operation inherited by a null extension, | |
8685 | -- it may be overridden by a body without a previous spec (one | |
2995860f | 8686 | -- more reason why these should be shunned). In that case we |
70f4ad20 AC |
8687 | -- remove the generated body if present, because the current |
8688 | -- one is the explicit overriding. | |
81db9d77 ES |
8689 | |
8690 | elsif Ekind (E) = E_Function | |
0791fbe9 | 8691 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
8692 | and then not Comes_From_Source (E) |
8693 | and then Has_Controlling_Result (E) | |
8694 | and then Is_Null_Extension (Etype (E)) | |
8695 | and then Comes_From_Source (Spec) | |
8696 | then | |
8697 | Set_Has_Completion (E, False); | |
8698 | ||
1366997b AC |
8699 | if Expander_Active |
8700 | and then Nkind (Parent (E)) = N_Function_Specification | |
8701 | then | |
81db9d77 ES |
8702 | Remove |
8703 | (Unit_Declaration_Node | |
1366997b AC |
8704 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
8705 | ||
81db9d77 ES |
8706 | return E; |
8707 | ||
1366997b AC |
8708 | -- If expansion is disabled, or if the wrapper function has |
8709 | -- not been generated yet, this a late body overriding an | |
8710 | -- inherited operation, or it is an overriding by some other | |
8711 | -- declaration before the controlling result is frozen. In | |
8712 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
8713 | |
8714 | else | |
8715 | return Empty; | |
8716 | end if; | |
8717 | ||
d44202ba HK |
8718 | -- If the body already exists, then this is an error unless |
8719 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
8720 | -- derived subprogram. It is also legal for an instance to |
8721 | -- contain type conformant overloadable declarations (but the | |
8722 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
8723 | |
8724 | elsif No (Alias (E)) | |
8725 | and then not Is_Intrinsic_Subprogram (E) | |
8726 | and then not In_Instance | |
d44202ba | 8727 | and then Post_Error |
996ae0b0 RK |
8728 | then |
8729 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 8730 | |
07fc65c4 GB |
8731 | if Is_Imported (E) then |
8732 | Error_Msg_NE | |
8733 | ("body not allowed for imported subprogram & declared#", | |
8734 | N, E); | |
8735 | else | |
8736 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
8737 | end if; | |
996ae0b0 RK |
8738 | end if; |
8739 | ||
d44202ba HK |
8740 | -- Child units cannot be overloaded, so a conformance mismatch |
8741 | -- between body and a previous spec is an error. | |
8742 | ||
996ae0b0 RK |
8743 | elsif Is_Child_Unit (E) |
8744 | and then | |
8745 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
8746 | and then | |
5d37ba92 | 8747 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
8748 | N_Compilation_Unit |
8749 | and then Post_Error | |
996ae0b0 | 8750 | then |
996ae0b0 RK |
8751 | Error_Msg_N |
8752 | ("body of child unit does not match previous declaration", N); | |
8753 | end if; | |
8754 | end if; | |
8755 | ||
8756 | <<Next_Entity>> | |
8757 | E := Homonym (E); | |
8758 | end loop; | |
8759 | ||
8760 | -- On exit, we know that no previous declaration of subprogram exists | |
8761 | ||
8762 | return Empty; | |
8763 | end Find_Corresponding_Spec; | |
8764 | ||
8765 | ---------------------- | |
8766 | -- Fully_Conformant -- | |
8767 | ---------------------- | |
8768 | ||
8769 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
8770 | Result : Boolean; | |
996ae0b0 RK |
8771 | begin |
8772 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
8773 | return Result; | |
8774 | end Fully_Conformant; | |
8775 | ||
8776 | ---------------------------------- | |
8777 | -- Fully_Conformant_Expressions -- | |
8778 | ---------------------------------- | |
8779 | ||
8780 | function Fully_Conformant_Expressions | |
8781 | (Given_E1 : Node_Id; | |
d05ef0ab | 8782 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
8783 | is |
8784 | E1 : constant Node_Id := Original_Node (Given_E1); | |
8785 | E2 : constant Node_Id := Original_Node (Given_E2); | |
8786 | -- We always test conformance on original nodes, since it is possible | |
8787 | -- for analysis and/or expansion to make things look as though they | |
8788 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
8789 | ||
8790 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
8791 | renames Fully_Conformant_Expressions; | |
8792 | ||
8793 | function FCL (L1, L2 : List_Id) return Boolean; | |
70f4ad20 AC |
8794 | -- Compare elements of two lists for conformance. Elements have to be |
8795 | -- conformant, and actuals inserted as default parameters do not match | |
8796 | -- explicit actuals with the same value. | |
996ae0b0 RK |
8797 | |
8798 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 8799 | -- Compare an operator node with a function call |
996ae0b0 RK |
8800 | |
8801 | --------- | |
8802 | -- FCL -- | |
8803 | --------- | |
8804 | ||
8805 | function FCL (L1, L2 : List_Id) return Boolean is | |
8806 | N1, N2 : Node_Id; | |
8807 | ||
8808 | begin | |
8809 | if L1 = No_List then | |
8810 | N1 := Empty; | |
8811 | else | |
8812 | N1 := First (L1); | |
8813 | end if; | |
8814 | ||
8815 | if L2 = No_List then | |
8816 | N2 := Empty; | |
8817 | else | |
8818 | N2 := First (L2); | |
8819 | end if; | |
8820 | ||
70f4ad20 | 8821 | -- Compare two lists, skipping rewrite insertions (we want to compare |
a90bd866 | 8822 | -- the original trees, not the expanded versions). |
996ae0b0 RK |
8823 | |
8824 | loop | |
8825 | if Is_Rewrite_Insertion (N1) then | |
8826 | Next (N1); | |
8827 | elsif Is_Rewrite_Insertion (N2) then | |
8828 | Next (N2); | |
8829 | elsif No (N1) then | |
8830 | return No (N2); | |
8831 | elsif No (N2) then | |
8832 | return False; | |
8833 | elsif not FCE (N1, N2) then | |
8834 | return False; | |
8835 | else | |
8836 | Next (N1); | |
8837 | Next (N2); | |
8838 | end if; | |
8839 | end loop; | |
8840 | end FCL; | |
8841 | ||
8842 | --------- | |
8843 | -- FCO -- | |
8844 | --------- | |
8845 | ||
8846 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
8847 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
8848 | Act : Node_Id; | |
8849 | ||
8850 | begin | |
8851 | if No (Actuals) | |
8852 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
8853 | then | |
8854 | return False; | |
8855 | ||
8856 | else | |
8857 | Act := First (Actuals); | |
8858 | ||
8859 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
8860 | if not FCE (Left_Opnd (Op_Node), Act) then |
8861 | return False; | |
8862 | end if; | |
8863 | ||
8864 | Next (Act); | |
8865 | end if; | |
8866 | ||
8867 | return Present (Act) | |
8868 | and then FCE (Right_Opnd (Op_Node), Act) | |
8869 | and then No (Next (Act)); | |
8870 | end if; | |
8871 | end FCO; | |
8872 | ||
8873 | -- Start of processing for Fully_Conformant_Expressions | |
8874 | ||
8875 | begin | |
8876 | -- Non-conformant if paren count does not match. Note: if some idiot | |
8877 | -- complains that we don't do this right for more than 3 levels of | |
a90bd866 | 8878 | -- parentheses, they will be treated with the respect they deserve. |
996ae0b0 RK |
8879 | |
8880 | if Paren_Count (E1) /= Paren_Count (E2) then | |
8881 | return False; | |
8882 | ||
82c80734 RD |
8883 | -- If same entities are referenced, then they are conformant even if |
8884 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
8885 | |
8886 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
8887 | if Present (Entity (E1)) then | |
8888 | return Entity (E1) = Entity (E2) | |
8889 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
8890 | and then Ekind (Entity (E1)) = E_Discriminant | |
8891 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
8892 | ||
8893 | elsif Nkind (E1) = N_Expanded_Name | |
8894 | and then Nkind (E2) = N_Expanded_Name | |
8895 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
8896 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
8897 | then | |
8898 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
8899 | ||
8900 | else | |
8901 | -- Identifiers in component associations don't always have | |
8902 | -- entities, but their names must conform. | |
8903 | ||
8904 | return Nkind (E1) = N_Identifier | |
8905 | and then Nkind (E2) = N_Identifier | |
8906 | and then Chars (E1) = Chars (E2); | |
8907 | end if; | |
8908 | ||
8909 | elsif Nkind (E1) = N_Character_Literal | |
8910 | and then Nkind (E2) = N_Expanded_Name | |
8911 | then | |
8912 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
8913 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
8914 | ||
8915 | elsif Nkind (E2) = N_Character_Literal | |
8916 | and then Nkind (E1) = N_Expanded_Name | |
8917 | then | |
8918 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
8919 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
8920 | ||
8fde064e | 8921 | elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
996ae0b0 RK |
8922 | return FCO (E1, E2); |
8923 | ||
8fde064e | 8924 | elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
996ae0b0 RK |
8925 | return FCO (E2, E1); |
8926 | ||
8927 | -- Otherwise we must have the same syntactic entity | |
8928 | ||
8929 | elsif Nkind (E1) /= Nkind (E2) then | |
8930 | return False; | |
8931 | ||
8932 | -- At this point, we specialize by node type | |
8933 | ||
8934 | else | |
8935 | case Nkind (E1) is | |
8936 | ||
8937 | when N_Aggregate => | |
8938 | return | |
8939 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
8940 | and then |
8941 | FCL (Component_Associations (E1), | |
8942 | Component_Associations (E2)); | |
996ae0b0 RK |
8943 | |
8944 | when N_Allocator => | |
8945 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
8946 | or else | |
8947 | Nkind (Expression (E2)) = N_Qualified_Expression | |
8948 | then | |
8949 | return FCE (Expression (E1), Expression (E2)); | |
8950 | ||
8951 | -- Check that the subtype marks and any constraints | |
8952 | -- are conformant | |
8953 | ||
8954 | else | |
8955 | declare | |
8956 | Indic1 : constant Node_Id := Expression (E1); | |
8957 | Indic2 : constant Node_Id := Expression (E2); | |
8958 | Elt1 : Node_Id; | |
8959 | Elt2 : Node_Id; | |
8960 | ||
8961 | begin | |
8962 | if Nkind (Indic1) /= N_Subtype_Indication then | |
8963 | return | |
8964 | Nkind (Indic2) /= N_Subtype_Indication | |
8965 | and then Entity (Indic1) = Entity (Indic2); | |
8966 | ||
8967 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
8968 | return | |
8969 | Nkind (Indic1) /= N_Subtype_Indication | |
8970 | and then Entity (Indic1) = Entity (Indic2); | |
8971 | ||
8972 | else | |
8973 | if Entity (Subtype_Mark (Indic1)) /= | |
8974 | Entity (Subtype_Mark (Indic2)) | |
8975 | then | |
8976 | return False; | |
8977 | end if; | |
8978 | ||
8979 | Elt1 := First (Constraints (Constraint (Indic1))); | |
8980 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
8981 | while Present (Elt1) and then Present (Elt2) loop |
8982 | if not FCE (Elt1, Elt2) then | |
8983 | return False; | |
8984 | end if; | |
8985 | ||
8986 | Next (Elt1); | |
8987 | Next (Elt2); | |
8988 | end loop; | |
8989 | ||
8990 | return True; | |
8991 | end if; | |
8992 | end; | |
8993 | end if; | |
8994 | ||
8995 | when N_Attribute_Reference => | |
8996 | return | |
8997 | Attribute_Name (E1) = Attribute_Name (E2) | |
8998 | and then FCL (Expressions (E1), Expressions (E2)); | |
8999 | ||
9000 | when N_Binary_Op => | |
9001 | return | |
9002 | Entity (E1) = Entity (E2) | |
9003 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
9004 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
9005 | ||
514d0fc5 | 9006 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
9007 | return |
9008 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
9009 | and then | |
9010 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
9011 | ||
19d846a0 RD |
9012 | when N_Case_Expression => |
9013 | declare | |
9014 | Alt1 : Node_Id; | |
9015 | Alt2 : Node_Id; | |
9016 | ||
9017 | begin | |
9018 | if not FCE (Expression (E1), Expression (E2)) then | |
9019 | return False; | |
9020 | ||
9021 | else | |
9022 | Alt1 := First (Alternatives (E1)); | |
9023 | Alt2 := First (Alternatives (E2)); | |
9024 | loop | |
9025 | if Present (Alt1) /= Present (Alt2) then | |
9026 | return False; | |
9027 | elsif No (Alt1) then | |
9028 | return True; | |
9029 | end if; | |
9030 | ||
9031 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
9032 | or else not FCL (Discrete_Choices (Alt1), | |
9033 | Discrete_Choices (Alt2)) | |
9034 | then | |
9035 | return False; | |
9036 | end if; | |
9037 | ||
9038 | Next (Alt1); | |
9039 | Next (Alt2); | |
9040 | end loop; | |
9041 | end if; | |
9042 | end; | |
9043 | ||
996ae0b0 RK |
9044 | when N_Character_Literal => |
9045 | return | |
9046 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
9047 | ||
9048 | when N_Component_Association => | |
9049 | return | |
9050 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
9051 | and then |
9052 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 9053 | |
996ae0b0 RK |
9054 | when N_Explicit_Dereference => |
9055 | return | |
9056 | FCE (Prefix (E1), Prefix (E2)); | |
9057 | ||
9058 | when N_Extension_Aggregate => | |
9059 | return | |
9060 | FCL (Expressions (E1), Expressions (E2)) | |
9061 | and then Null_Record_Present (E1) = | |
9062 | Null_Record_Present (E2) | |
9063 | and then FCL (Component_Associations (E1), | |
9064 | Component_Associations (E2)); | |
9065 | ||
9066 | when N_Function_Call => | |
9067 | return | |
9068 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
9069 | and then |
9070 | FCL (Parameter_Associations (E1), | |
9071 | Parameter_Associations (E2)); | |
996ae0b0 | 9072 | |
9b16cb57 RD |
9073 | when N_If_Expression => |
9074 | return | |
9075 | FCL (Expressions (E1), Expressions (E2)); | |
9076 | ||
996ae0b0 RK |
9077 | when N_Indexed_Component => |
9078 | return | |
9079 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9080 | and then |
9081 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
9082 | |
9083 | when N_Integer_Literal => | |
9084 | return (Intval (E1) = Intval (E2)); | |
9085 | ||
9086 | when N_Null => | |
9087 | return True; | |
9088 | ||
9089 | when N_Operator_Symbol => | |
9090 | return | |
9091 | Chars (E1) = Chars (E2); | |
9092 | ||
9093 | when N_Others_Choice => | |
9094 | return True; | |
9095 | ||
9096 | when N_Parameter_Association => | |
9097 | return | |
996ae0b0 RK |
9098 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
9099 | and then FCE (Explicit_Actual_Parameter (E1), | |
9100 | Explicit_Actual_Parameter (E2)); | |
9101 | ||
9102 | when N_Qualified_Expression => | |
9103 | return | |
9104 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
9105 | and then |
9106 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 9107 | |
2010d078 AC |
9108 | when N_Quantified_Expression => |
9109 | if not FCE (Condition (E1), Condition (E2)) then | |
9110 | return False; | |
9111 | end if; | |
9112 | ||
9113 | if Present (Loop_Parameter_Specification (E1)) | |
9114 | and then Present (Loop_Parameter_Specification (E2)) | |
9115 | then | |
9116 | declare | |
9117 | L1 : constant Node_Id := | |
9118 | Loop_Parameter_Specification (E1); | |
9119 | L2 : constant Node_Id := | |
9120 | Loop_Parameter_Specification (E2); | |
9121 | ||
9122 | begin | |
9123 | return | |
9124 | Reverse_Present (L1) = Reverse_Present (L2) | |
9125 | and then | |
9126 | FCE (Defining_Identifier (L1), | |
9127 | Defining_Identifier (L2)) | |
9128 | and then | |
9129 | FCE (Discrete_Subtype_Definition (L1), | |
9130 | Discrete_Subtype_Definition (L2)); | |
9131 | end; | |
9132 | ||
804670f1 AC |
9133 | elsif Present (Iterator_Specification (E1)) |
9134 | and then Present (Iterator_Specification (E2)) | |
9135 | then | |
2010d078 AC |
9136 | declare |
9137 | I1 : constant Node_Id := Iterator_Specification (E1); | |
9138 | I2 : constant Node_Id := Iterator_Specification (E2); | |
9139 | ||
9140 | begin | |
9141 | return | |
9142 | FCE (Defining_Identifier (I1), | |
9143 | Defining_Identifier (I2)) | |
9144 | and then | |
9145 | Of_Present (I1) = Of_Present (I2) | |
9146 | and then | |
9147 | Reverse_Present (I1) = Reverse_Present (I2) | |
9148 | and then FCE (Name (I1), Name (I2)) | |
9149 | and then FCE (Subtype_Indication (I1), | |
9150 | Subtype_Indication (I2)); | |
9151 | end; | |
804670f1 AC |
9152 | |
9153 | -- The quantified expressions used different specifications to | |
9154 | -- walk their respective ranges. | |
9155 | ||
9156 | else | |
9157 | return False; | |
2010d078 AC |
9158 | end if; |
9159 | ||
996ae0b0 RK |
9160 | when N_Range => |
9161 | return | |
9162 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
9163 | and then |
9164 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
9165 | |
9166 | when N_Real_Literal => | |
9167 | return (Realval (E1) = Realval (E2)); | |
9168 | ||
9169 | when N_Selected_Component => | |
9170 | return | |
9171 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9172 | and then |
9173 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
9174 | |
9175 | when N_Slice => | |
9176 | return | |
9177 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9178 | and then |
9179 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
9180 | |
9181 | when N_String_Literal => | |
9182 | declare | |
9183 | S1 : constant String_Id := Strval (E1); | |
9184 | S2 : constant String_Id := Strval (E2); | |
9185 | L1 : constant Nat := String_Length (S1); | |
9186 | L2 : constant Nat := String_Length (S2); | |
9187 | ||
9188 | begin | |
9189 | if L1 /= L2 then | |
9190 | return False; | |
9191 | ||
9192 | else | |
9193 | for J in 1 .. L1 loop | |
9194 | if Get_String_Char (S1, J) /= | |
9195 | Get_String_Char (S2, J) | |
9196 | then | |
9197 | return False; | |
9198 | end if; | |
9199 | end loop; | |
9200 | ||
9201 | return True; | |
9202 | end if; | |
9203 | end; | |
9204 | ||
9205 | when N_Type_Conversion => | |
9206 | return | |
9207 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
9208 | and then |
9209 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
9210 | |
9211 | when N_Unary_Op => | |
9212 | return | |
9213 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
9214 | and then |
9215 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
9216 | |
9217 | when N_Unchecked_Type_Conversion => | |
9218 | return | |
9219 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
9220 | and then |
9221 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
9222 | |
9223 | -- All other node types cannot appear in this context. Strictly | |
9224 | -- we should raise a fatal internal error. Instead we just ignore | |
9225 | -- the nodes. This means that if anyone makes a mistake in the | |
2995860f AC |
9226 | -- expander and mucks an expression tree irretrievably, the result |
9227 | -- will be a failure to detect a (probably very obscure) case | |
9228 | -- of non-conformance, which is better than bombing on some | |
996ae0b0 RK |
9229 | -- case where two expressions do in fact conform. |
9230 | ||
9231 | when others => | |
9232 | return True; | |
9233 | ||
9234 | end case; | |
9235 | end if; | |
9236 | end Fully_Conformant_Expressions; | |
9237 | ||
fbf5a39b AC |
9238 | ---------------------------------------- |
9239 | -- Fully_Conformant_Discrete_Subtypes -- | |
9240 | ---------------------------------------- | |
9241 | ||
9242 | function Fully_Conformant_Discrete_Subtypes | |
9243 | (Given_S1 : Node_Id; | |
d05ef0ab | 9244 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
9245 | is |
9246 | S1 : constant Node_Id := Original_Node (Given_S1); | |
9247 | S2 : constant Node_Id := Original_Node (Given_S2); | |
9248 | ||
9249 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
9250 | -- Special-case for a bound given by a discriminant, which in the body |
9251 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
9252 | |
9253 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 9254 | -- Check both bounds |
fbf5a39b | 9255 | |
5d37ba92 ES |
9256 | ----------------------- |
9257 | -- Conforming_Bounds -- | |
9258 | ----------------------- | |
9259 | ||
fbf5a39b AC |
9260 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
9261 | begin | |
9262 | if Is_Entity_Name (B1) | |
9263 | and then Is_Entity_Name (B2) | |
9264 | and then Ekind (Entity (B1)) = E_Discriminant | |
9265 | then | |
9266 | return Chars (B1) = Chars (B2); | |
9267 | ||
9268 | else | |
9269 | return Fully_Conformant_Expressions (B1, B2); | |
9270 | end if; | |
9271 | end Conforming_Bounds; | |
9272 | ||
5d37ba92 ES |
9273 | ----------------------- |
9274 | -- Conforming_Ranges -- | |
9275 | ----------------------- | |
9276 | ||
fbf5a39b AC |
9277 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
9278 | begin | |
9279 | return | |
9280 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
9281 | and then | |
9282 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
9283 | end Conforming_Ranges; | |
9284 | ||
9285 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
9286 | ||
9287 | begin | |
9288 | if Nkind (S1) /= Nkind (S2) then | |
9289 | return False; | |
9290 | ||
9291 | elsif Is_Entity_Name (S1) then | |
9292 | return Entity (S1) = Entity (S2); | |
9293 | ||
9294 | elsif Nkind (S1) = N_Range then | |
9295 | return Conforming_Ranges (S1, S2); | |
9296 | ||
9297 | elsif Nkind (S1) = N_Subtype_Indication then | |
9298 | return | |
9299 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
9300 | and then | |
9301 | Conforming_Ranges | |
9302 | (Range_Expression (Constraint (S1)), | |
9303 | Range_Expression (Constraint (S2))); | |
9304 | else | |
9305 | return True; | |
9306 | end if; | |
9307 | end Fully_Conformant_Discrete_Subtypes; | |
9308 | ||
996ae0b0 RK |
9309 | -------------------- |
9310 | -- Install_Entity -- | |
9311 | -------------------- | |
9312 | ||
9313 | procedure Install_Entity (E : Entity_Id) is | |
9314 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
9315 | begin |
9316 | Set_Is_Immediately_Visible (E); | |
9317 | Set_Current_Entity (E); | |
9318 | Set_Homonym (E, Prev); | |
9319 | end Install_Entity; | |
9320 | ||
9321 | --------------------- | |
9322 | -- Install_Formals -- | |
9323 | --------------------- | |
9324 | ||
9325 | procedure Install_Formals (Id : Entity_Id) is | |
9326 | F : Entity_Id; | |
996ae0b0 RK |
9327 | begin |
9328 | F := First_Formal (Id); | |
996ae0b0 RK |
9329 | while Present (F) loop |
9330 | Install_Entity (F); | |
9331 | Next_Formal (F); | |
9332 | end loop; | |
9333 | end Install_Formals; | |
9334 | ||
ce2b6ba5 JM |
9335 | ----------------------------- |
9336 | -- Is_Interface_Conformant -- | |
9337 | ----------------------------- | |
9338 | ||
9339 | function Is_Interface_Conformant | |
9340 | (Tagged_Type : Entity_Id; | |
9341 | Iface_Prim : Entity_Id; | |
9342 | Prim : Entity_Id) return Boolean | |
9343 | is | |
9e92ad49 AC |
9344 | -- The operation may in fact be an inherited (implicit) operation |
9345 | -- rather than the original interface primitive, so retrieve the | |
9346 | -- ultimate ancestor. | |
9347 | ||
9348 | Iface : constant Entity_Id := | |
9349 | Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); | |
fceeaab6 ES |
9350 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
9351 | ||
25ebc085 AC |
9352 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
9353 | -- Return the controlling formal of Prim | |
9354 | ||
59e6b23c AC |
9355 | ------------------------ |
9356 | -- Controlling_Formal -- | |
9357 | ------------------------ | |
9358 | ||
25ebc085 | 9359 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
15918371 | 9360 | E : Entity_Id; |
59e6b23c | 9361 | |
25ebc085 | 9362 | begin |
15918371 | 9363 | E := First_Entity (Prim); |
25ebc085 AC |
9364 | while Present (E) loop |
9365 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
9366 | return E; | |
9367 | end if; | |
9368 | ||
9369 | Next_Entity (E); | |
9370 | end loop; | |
9371 | ||
9372 | return Empty; | |
9373 | end Controlling_Formal; | |
9374 | ||
9375 | -- Local variables | |
9376 | ||
9377 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
9378 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
9379 | ||
9380 | -- Start of processing for Is_Interface_Conformant | |
9381 | ||
ce2b6ba5 JM |
9382 | begin |
9383 | pragma Assert (Is_Subprogram (Iface_Prim) | |
9384 | and then Is_Subprogram (Prim) | |
9385 | and then Is_Dispatching_Operation (Iface_Prim) | |
9386 | and then Is_Dispatching_Operation (Prim)); | |
9387 | ||
fceeaab6 | 9388 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
9389 | or else (Present (Alias (Iface_Prim)) |
9390 | and then | |
9391 | Is_Interface | |
9392 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
9393 | ||
9394 | if Prim = Iface_Prim | |
9395 | or else not Is_Subprogram (Prim) | |
9396 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
9397 | or else not Is_Dispatching_Operation (Prim) | |
9398 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 | 9399 | or else No (Typ) |
8a49a499 | 9400 | or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
ce2b6ba5 JM |
9401 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
9402 | then | |
9403 | return False; | |
9404 | ||
25ebc085 AC |
9405 | -- The mode of the controlling formals must match |
9406 | ||
9407 | elsif Present (Iface_Ctrl_F) | |
15918371 AC |
9408 | and then Present (Prim_Ctrl_F) |
9409 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
25ebc085 AC |
9410 | then |
9411 | return False; | |
9412 | ||
9413 | -- Case of a procedure, or a function whose result type matches the | |
9414 | -- result type of the interface primitive, or a function that has no | |
9415 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
9416 | |
9417 | elsif Ekind (Iface_Prim) = E_Procedure | |
9418 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 9419 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 9420 | then |
b4d7b435 AC |
9421 | return Type_Conformant |
9422 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 9423 | |
2995860f AC |
9424 | -- Case of a function returning an interface, or an access to one. Check |
9425 | -- that the return types correspond. | |
ce2b6ba5 | 9426 | |
fceeaab6 ES |
9427 | elsif Implements_Interface (Typ, Iface) then |
9428 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
9429 | /= |
9430 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
9431 | then |
9432 | return False; | |
fceeaab6 ES |
9433 | else |
9434 | return | |
9e92ad49 | 9435 | Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
ce2b6ba5 | 9436 | Skip_Controlling_Formals => True); |
fceeaab6 | 9437 | end if; |
ce2b6ba5 | 9438 | |
fceeaab6 ES |
9439 | else |
9440 | return False; | |
ce2b6ba5 | 9441 | end if; |
ce2b6ba5 JM |
9442 | end Is_Interface_Conformant; |
9443 | ||
996ae0b0 RK |
9444 | --------------------------------- |
9445 | -- Is_Non_Overriding_Operation -- | |
9446 | --------------------------------- | |
9447 | ||
9448 | function Is_Non_Overriding_Operation | |
9449 | (Prev_E : Entity_Id; | |
d05ef0ab | 9450 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
9451 | is |
9452 | Formal : Entity_Id; | |
9453 | F_Typ : Entity_Id; | |
9454 | G_Typ : Entity_Id := Empty; | |
9455 | ||
9456 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
9457 | -- If F_Type is a derived type associated with a generic actual subtype, |
9458 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
9459 | |
9460 | function Types_Correspond | |
9461 | (P_Type : Entity_Id; | |
d05ef0ab | 9462 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
9463 | -- Returns true if and only if the types (or designated types in the |
9464 | -- case of anonymous access types) are the same or N_Type is derived | |
9465 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
9466 | |
9467 | ----------------------------- | |
9468 | -- Get_Generic_Parent_Type -- | |
9469 | ----------------------------- | |
9470 | ||
9471 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
9472 | G_Typ : Entity_Id; | |
702d2020 | 9473 | Defn : Node_Id; |
996ae0b0 RK |
9474 | Indic : Node_Id; |
9475 | ||
9476 | begin | |
9477 | if Is_Derived_Type (F_Typ) | |
9478 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
9479 | then | |
82c80734 RD |
9480 | -- The tree must be traversed to determine the parent subtype in |
9481 | -- the generic unit, which unfortunately isn't always available | |
9482 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
9483 | -- is needed for cases where a full derived type has been | |
9484 | -- rewritten.) | |
996ae0b0 | 9485 | |
702d2020 AC |
9486 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); |
9487 | if Nkind (Defn) = N_Derived_Type_Definition then | |
9488 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 9489 | |
702d2020 AC |
9490 | if Nkind (Indic) = N_Subtype_Indication then |
9491 | G_Typ := Entity (Subtype_Mark (Indic)); | |
9492 | else | |
9493 | G_Typ := Entity (Indic); | |
9494 | end if; | |
996ae0b0 | 9495 | |
702d2020 AC |
9496 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
9497 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
9498 | then | |
9499 | return Generic_Parent_Type (Parent (G_Typ)); | |
9500 | end if; | |
996ae0b0 RK |
9501 | end if; |
9502 | end if; | |
9503 | ||
9504 | return Empty; | |
9505 | end Get_Generic_Parent_Type; | |
9506 | ||
9507 | ---------------------- | |
9508 | -- Types_Correspond -- | |
9509 | ---------------------- | |
9510 | ||
9511 | function Types_Correspond | |
9512 | (P_Type : Entity_Id; | |
d05ef0ab | 9513 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
9514 | is |
9515 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
9516 | New_Type : Entity_Id := Base_Type (N_Type); | |
9517 | ||
9518 | begin | |
9519 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
9520 | Prev_Type := Designated_Type (Prev_Type); | |
9521 | end if; | |
9522 | ||
9523 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
9524 | New_Type := Designated_Type (New_Type); | |
9525 | end if; | |
9526 | ||
9527 | if Prev_Type = New_Type then | |
9528 | return True; | |
9529 | ||
9530 | elsif not Is_Class_Wide_Type (New_Type) then | |
9531 | while Etype (New_Type) /= New_Type loop | |
9532 | New_Type := Etype (New_Type); | |
9533 | if New_Type = Prev_Type then | |
9534 | return True; | |
9535 | end if; | |
9536 | end loop; | |
9537 | end if; | |
9538 | return False; | |
9539 | end Types_Correspond; | |
9540 | ||
9541 | -- Start of processing for Is_Non_Overriding_Operation | |
9542 | ||
9543 | begin | |
82c80734 RD |
9544 | -- In the case where both operations are implicit derived subprograms |
9545 | -- then neither overrides the other. This can only occur in certain | |
9546 | -- obscure cases (e.g., derivation from homographs created in a generic | |
9547 | -- instantiation). | |
996ae0b0 RK |
9548 | |
9549 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
9550 | return True; | |
9551 | ||
9552 | elsif Ekind (Current_Scope) = E_Package | |
9553 | and then Is_Generic_Instance (Current_Scope) | |
9554 | and then In_Private_Part (Current_Scope) | |
9555 | and then Comes_From_Source (New_E) | |
9556 | then | |
702d2020 AC |
9557 | -- We examine the formals and result type of the inherited operation, |
9558 | -- to determine whether their type is derived from (the instance of) | |
9559 | -- a generic type. The first such formal or result type is the one | |
9560 | -- tested. | |
996ae0b0 RK |
9561 | |
9562 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
9563 | while Present (Formal) loop |
9564 | F_Typ := Base_Type (Etype (Formal)); | |
9565 | ||
9566 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
9567 | F_Typ := Designated_Type (F_Typ); | |
9568 | end if; | |
9569 | ||
9570 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 9571 | exit when Present (G_Typ); |
996ae0b0 RK |
9572 | |
9573 | Next_Formal (Formal); | |
9574 | end loop; | |
9575 | ||
c8ef728f | 9576 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
9577 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
9578 | end if; | |
9579 | ||
9580 | if No (G_Typ) then | |
9581 | return False; | |
9582 | end if; | |
9583 | ||
8dbd1460 AC |
9584 | -- If the generic type is a private type, then the original operation |
9585 | -- was not overriding in the generic, because there was no primitive | |
9586 | -- operation to override. | |
996ae0b0 RK |
9587 | |
9588 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
9589 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 9590 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
9591 | then |
9592 | return True; | |
9593 | ||
9594 | -- The generic parent type is the ancestor of a formal derived | |
9595 | -- type declaration. We need to check whether it has a primitive | |
9596 | -- operation that should be overridden by New_E in the generic. | |
9597 | ||
9598 | else | |
9599 | declare | |
9600 | P_Formal : Entity_Id; | |
9601 | N_Formal : Entity_Id; | |
9602 | P_Typ : Entity_Id; | |
9603 | N_Typ : Entity_Id; | |
9604 | P_Prim : Entity_Id; | |
9605 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
9606 | ||
9607 | begin | |
9608 | while Present (Prim_Elt) loop | |
9609 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 9610 | |
996ae0b0 RK |
9611 | if Chars (P_Prim) = Chars (New_E) |
9612 | and then Ekind (P_Prim) = Ekind (New_E) | |
9613 | then | |
9614 | P_Formal := First_Formal (P_Prim); | |
9615 | N_Formal := First_Formal (New_E); | |
9616 | while Present (P_Formal) and then Present (N_Formal) loop | |
9617 | P_Typ := Etype (P_Formal); | |
9618 | N_Typ := Etype (N_Formal); | |
9619 | ||
9620 | if not Types_Correspond (P_Typ, N_Typ) then | |
9621 | exit; | |
9622 | end if; | |
9623 | ||
9624 | Next_Entity (P_Formal); | |
9625 | Next_Entity (N_Formal); | |
9626 | end loop; | |
9627 | ||
82c80734 RD |
9628 | -- Found a matching primitive operation belonging to the |
9629 | -- formal ancestor type, so the new subprogram is | |
9630 | -- overriding. | |
996ae0b0 | 9631 | |
c8ef728f ES |
9632 | if No (P_Formal) |
9633 | and then No (N_Formal) | |
996ae0b0 RK |
9634 | and then (Ekind (New_E) /= E_Function |
9635 | or else | |
8fde064e AC |
9636 | Types_Correspond |
9637 | (Etype (P_Prim), Etype (New_E))) | |
996ae0b0 RK |
9638 | then |
9639 | return False; | |
9640 | end if; | |
9641 | end if; | |
9642 | ||
9643 | Next_Elmt (Prim_Elt); | |
9644 | end loop; | |
9645 | ||
2995860f AC |
9646 | -- If no match found, then the new subprogram does not override |
9647 | -- in the generic (nor in the instance). | |
996ae0b0 | 9648 | |
260359e3 AC |
9649 | -- If the type in question is not abstract, and the subprogram |
9650 | -- is, this will be an error if the new operation is in the | |
9651 | -- private part of the instance. Emit a warning now, which will | |
9652 | -- make the subsequent error message easier to understand. | |
9653 | ||
9654 | if not Is_Abstract_Type (F_Typ) | |
9655 | and then Is_Abstract_Subprogram (Prev_E) | |
9656 | and then In_Private_Part (Current_Scope) | |
9657 | then | |
9658 | Error_Msg_Node_2 := F_Typ; | |
9659 | Error_Msg_NE | |
9660 | ("private operation& in generic unit does not override " & | |
dbfeb4fa | 9661 | "any primitive operation of& (RM 12.3 (18))??", |
260359e3 AC |
9662 | New_E, New_E); |
9663 | end if; | |
9664 | ||
996ae0b0 RK |
9665 | return True; |
9666 | end; | |
9667 | end if; | |
9668 | else | |
9669 | return False; | |
9670 | end if; | |
9671 | end Is_Non_Overriding_Operation; | |
9672 | ||
beacce02 AC |
9673 | ------------------------------------- |
9674 | -- List_Inherited_Pre_Post_Aspects -- | |
9675 | ------------------------------------- | |
9676 | ||
9677 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
9678 | begin | |
e606088a | 9679 | if Opt.List_Inherited_Aspects |
beacce02 AC |
9680 | and then (Is_Subprogram (E) or else Is_Generic_Subprogram (E)) |
9681 | then | |
9682 | declare | |
dbfeb4fa | 9683 | Inherited : constant Subprogram_List := Inherited_Subprograms (E); |
beacce02 AC |
9684 | P : Node_Id; |
9685 | ||
9686 | begin | |
9687 | for J in Inherited'Range loop | |
d6095153 | 9688 | P := Pre_Post_Conditions (Contract (Inherited (J))); |
beacce02 AC |
9689 | while Present (P) loop |
9690 | Error_Msg_Sloc := Sloc (P); | |
9691 | ||
9692 | if Class_Present (P) and then not Split_PPC (P) then | |
9693 | if Pragma_Name (P) = Name_Precondition then | |
9694 | Error_Msg_N | |
685bc70f AC |
9695 | ("info: & inherits `Pre''Class` aspect from #?L?", |
9696 | E); | |
beacce02 AC |
9697 | else |
9698 | Error_Msg_N | |
685bc70f AC |
9699 | ("info: & inherits `Post''Class` aspect from #?L?", |
9700 | E); | |
beacce02 AC |
9701 | end if; |
9702 | end if; | |
9703 | ||
9704 | P := Next_Pragma (P); | |
9705 | end loop; | |
9706 | end loop; | |
9707 | end; | |
9708 | end if; | |
9709 | end List_Inherited_Pre_Post_Aspects; | |
9710 | ||
996ae0b0 RK |
9711 | ------------------------------ |
9712 | -- Make_Inequality_Operator -- | |
9713 | ------------------------------ | |
9714 | ||
9715 | -- S is the defining identifier of an equality operator. We build a | |
9716 | -- subprogram declaration with the right signature. This operation is | |
9717 | -- intrinsic, because it is always expanded as the negation of the | |
9718 | -- call to the equality function. | |
9719 | ||
9720 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
9721 | Loc : constant Source_Ptr := Sloc (S); | |
9722 | Decl : Node_Id; | |
9723 | Formals : List_Id; | |
9724 | Op_Name : Entity_Id; | |
9725 | ||
c8ef728f ES |
9726 | FF : constant Entity_Id := First_Formal (S); |
9727 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
9728 | |
9729 | begin | |
c8ef728f | 9730 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 9731 | |
c8ef728f | 9732 | if No (NF) then |
996ae0b0 RK |
9733 | return; |
9734 | end if; | |
9735 | ||
c8ef728f ES |
9736 | declare |
9737 | A : constant Entity_Id := | |
9738 | Make_Defining_Identifier (Sloc (FF), | |
9739 | Chars => Chars (FF)); | |
9740 | ||
5d37ba92 ES |
9741 | B : constant Entity_Id := |
9742 | Make_Defining_Identifier (Sloc (NF), | |
9743 | Chars => Chars (NF)); | |
c8ef728f ES |
9744 | |
9745 | begin | |
9746 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
9747 | ||
9748 | Formals := New_List ( | |
9749 | Make_Parameter_Specification (Loc, | |
9750 | Defining_Identifier => A, | |
9751 | Parameter_Type => | |
e4494292 | 9752 | New_Occurrence_Of (Etype (First_Formal (S)), |
c8ef728f ES |
9753 | Sloc (Etype (First_Formal (S))))), |
9754 | ||
9755 | Make_Parameter_Specification (Loc, | |
9756 | Defining_Identifier => B, | |
9757 | Parameter_Type => | |
e4494292 | 9758 | New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
c8ef728f ES |
9759 | Sloc (Etype (Next_Formal (First_Formal (S))))))); |
9760 | ||
9761 | Decl := | |
9762 | Make_Subprogram_Declaration (Loc, | |
9763 | Specification => | |
9764 | Make_Function_Specification (Loc, | |
9765 | Defining_Unit_Name => Op_Name, | |
9766 | Parameter_Specifications => Formals, | |
9767 | Result_Definition => | |
e4494292 | 9768 | New_Occurrence_Of (Standard_Boolean, Loc))); |
c8ef728f ES |
9769 | |
9770 | -- Insert inequality right after equality if it is explicit or after | |
9771 | -- the derived type when implicit. These entities are created only | |
2995860f AC |
9772 | -- for visibility purposes, and eventually replaced in the course |
9773 | -- of expansion, so they do not need to be attached to the tree and | |
9774 | -- seen by the back-end. Keeping them internal also avoids spurious | |
c8ef728f ES |
9775 | -- freezing problems. The declaration is inserted in the tree for |
9776 | -- analysis, and removed afterwards. If the equality operator comes | |
9777 | -- from an explicit declaration, attach the inequality immediately | |
9778 | -- after. Else the equality is inherited from a derived type | |
9779 | -- declaration, so insert inequality after that declaration. | |
9780 | ||
9781 | if No (Alias (S)) then | |
9782 | Insert_After (Unit_Declaration_Node (S), Decl); | |
9783 | elsif Is_List_Member (Parent (S)) then | |
9784 | Insert_After (Parent (S), Decl); | |
9785 | else | |
9786 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
9787 | end if; | |
996ae0b0 | 9788 | |
c8ef728f ES |
9789 | Mark_Rewrite_Insertion (Decl); |
9790 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
9791 | Analyze (Decl); | |
9792 | Remove (Decl); | |
9793 | Set_Has_Completion (Op_Name); | |
9794 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 9795 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 9796 | end; |
996ae0b0 RK |
9797 | end Make_Inequality_Operator; |
9798 | ||
9799 | ---------------------- | |
9800 | -- May_Need_Actuals -- | |
9801 | ---------------------- | |
9802 | ||
9803 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
9804 | F : Entity_Id; | |
9805 | B : Boolean; | |
9806 | ||
9807 | begin | |
9808 | F := First_Formal (Fun); | |
9809 | B := True; | |
996ae0b0 RK |
9810 | while Present (F) loop |
9811 | if No (Default_Value (F)) then | |
9812 | B := False; | |
9813 | exit; | |
9814 | end if; | |
9815 | ||
9816 | Next_Formal (F); | |
9817 | end loop; | |
9818 | ||
9819 | Set_Needs_No_Actuals (Fun, B); | |
9820 | end May_Need_Actuals; | |
9821 | ||
9822 | --------------------- | |
9823 | -- Mode_Conformant -- | |
9824 | --------------------- | |
9825 | ||
9826 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
9827 | Result : Boolean; | |
996ae0b0 RK |
9828 | begin |
9829 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
9830 | return Result; | |
9831 | end Mode_Conformant; | |
9832 | ||
9833 | --------------------------- | |
9834 | -- New_Overloaded_Entity -- | |
9835 | --------------------------- | |
9836 | ||
9837 | procedure New_Overloaded_Entity | |
9838 | (S : Entity_Id; | |
9839 | Derived_Type : Entity_Id := Empty) | |
9840 | is | |
ec4867fa | 9841 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
9842 | -- Set if the current scope has an operation that is type-conformant |
9843 | -- with S, and becomes hidden by S. | |
9844 | ||
5d37ba92 ES |
9845 | Is_Primitive_Subp : Boolean; |
9846 | -- Set to True if the new subprogram is primitive | |
9847 | ||
fbf5a39b AC |
9848 | E : Entity_Id; |
9849 | -- Entity that S overrides | |
9850 | ||
996ae0b0 | 9851 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
9852 | -- Predecessor of E in Homonym chain |
9853 | ||
5d37ba92 ES |
9854 | procedure Check_For_Primitive_Subprogram |
9855 | (Is_Primitive : out Boolean; | |
9856 | Is_Overriding : Boolean := False); | |
9857 | -- If the subprogram being analyzed is a primitive operation of the type | |
9858 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
9859 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
9860 | -- corresponding flag on the entity itself for later use. | |
9861 | ||
ec4867fa ES |
9862 | procedure Check_Synchronized_Overriding |
9863 | (Def_Id : Entity_Id; | |
ec4867fa ES |
9864 | Overridden_Subp : out Entity_Id); |
9865 | -- First determine if Def_Id is an entry or a subprogram either defined | |
9866 | -- in the scope of a task or protected type, or is a primitive of such | |
9867 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
9868 | -- implemented by the synchronized type, return the overridden entity | |
9869 | -- or Empty. | |
758c442c | 9870 | |
996ae0b0 RK |
9871 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
9872 | -- Check that E is declared in the private part of the current package, | |
9873 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 9874 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
9875 | -- set when freezing entities, so we must examine the place of the |
9876 | -- declaration in the tree, and recognize wrapper packages as well. | |
9877 | ||
2ddc2000 AC |
9878 | function Is_Overriding_Alias |
9879 | (Old_E : Entity_Id; | |
9880 | New_E : Entity_Id) return Boolean; | |
9881 | -- Check whether new subprogram and old subprogram are both inherited | |
9882 | -- from subprograms that have distinct dispatch table entries. This can | |
2995860f AC |
9883 | -- occur with derivations from instances with accidental homonyms. The |
9884 | -- function is conservative given that the converse is only true within | |
9885 | -- instances that contain accidental overloadings. | |
2ddc2000 | 9886 | |
5d37ba92 ES |
9887 | ------------------------------------ |
9888 | -- Check_For_Primitive_Subprogram -- | |
9889 | ------------------------------------ | |
996ae0b0 | 9890 | |
5d37ba92 ES |
9891 | procedure Check_For_Primitive_Subprogram |
9892 | (Is_Primitive : out Boolean; | |
9893 | Is_Overriding : Boolean := False) | |
ec4867fa | 9894 | is |
996ae0b0 RK |
9895 | Formal : Entity_Id; |
9896 | F_Typ : Entity_Id; | |
07fc65c4 | 9897 | B_Typ : Entity_Id; |
996ae0b0 RK |
9898 | |
9899 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
9900 | -- Returns true if T is declared in the visible part of the current |
9901 | -- package scope; otherwise returns false. Assumes that T is declared | |
9902 | -- in a package. | |
996ae0b0 RK |
9903 | |
9904 | procedure Check_Private_Overriding (T : Entity_Id); | |
9905 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
9906 | -- abstract type is declared in a private part, then it must override |
9907 | -- an abstract subprogram declared in the visible part. Also checks | |
9908 | -- that if a primitive function with a controlling result is declared | |
9909 | -- in a private part, then it must override a function declared in | |
9910 | -- the visible part. | |
996ae0b0 RK |
9911 | |
9912 | ------------------------------ | |
9913 | -- Check_Private_Overriding -- | |
9914 | ------------------------------ | |
9915 | ||
9916 | procedure Check_Private_Overriding (T : Entity_Id) is | |
9917 | begin | |
51c16e29 | 9918 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
9919 | and then In_Private_Part (Current_Scope) |
9920 | and then Visible_Part_Type (T) | |
9921 | and then not In_Instance | |
9922 | then | |
f937473f RD |
9923 | if Is_Abstract_Type (T) |
9924 | and then Is_Abstract_Subprogram (S) | |
9925 | and then (not Is_Overriding | |
8dbd1460 | 9926 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 9927 | then |
ed2233dc | 9928 | Error_Msg_N |
19d846a0 RD |
9929 | ("abstract subprograms must be visible " |
9930 | & "(RM 3.9.3(10))!", S); | |
758c442c | 9931 | |
8fde064e AC |
9932 | elsif Ekind (S) = E_Function and then not Is_Overriding then |
9933 | if Is_Tagged_Type (T) and then T = Base_Type (Etype (S)) then | |
2e79de51 AC |
9934 | Error_Msg_N |
9935 | ("private function with tagged result must" | |
9936 | & " override visible-part function", S); | |
9937 | Error_Msg_N | |
9938 | ("\move subprogram to the visible part" | |
9939 | & " (RM 3.9.3(10))", S); | |
9940 | ||
9941 | -- AI05-0073: extend this test to the case of a function | |
9942 | -- with a controlling access result. | |
9943 | ||
9944 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
9945 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
9946 | and then | |
9947 | not Is_Class_Wide_Type (Designated_Type (Etype (S))) | |
dbe945f1 | 9948 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
9949 | then |
9950 | Error_Msg_N | |
9951 | ("private function with controlling access result " | |
9952 | & "must override visible-part function", S); | |
9953 | Error_Msg_N | |
9954 | ("\move subprogram to the visible part" | |
9955 | & " (RM 3.9.3(10))", S); | |
9956 | end if; | |
996ae0b0 RK |
9957 | end if; |
9958 | end if; | |
9959 | end Check_Private_Overriding; | |
9960 | ||
9961 | ----------------------- | |
9962 | -- Visible_Part_Type -- | |
9963 | ----------------------- | |
9964 | ||
9965 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
9966 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
9967 | N : Node_Id; | |
996ae0b0 RK |
9968 | |
9969 | begin | |
8dbd1460 AC |
9970 | -- If the entity is a private type, then it must be declared in a |
9971 | -- visible part. | |
996ae0b0 RK |
9972 | |
9973 | if Ekind (T) in Private_Kind then | |
9974 | return True; | |
9975 | end if; | |
9976 | ||
9977 | -- Otherwise, we traverse the visible part looking for its | |
9978 | -- corresponding declaration. We cannot use the declaration | |
9979 | -- node directly because in the private part the entity of a | |
9980 | -- private type is the one in the full view, which does not | |
9981 | -- indicate that it is the completion of something visible. | |
9982 | ||
07fc65c4 | 9983 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
9984 | while Present (N) loop |
9985 | if Nkind (N) = N_Full_Type_Declaration | |
9986 | and then Present (Defining_Identifier (N)) | |
9987 | and then T = Defining_Identifier (N) | |
9988 | then | |
9989 | return True; | |
9990 | ||
800621e0 RD |
9991 | elsif Nkind_In (N, N_Private_Type_Declaration, |
9992 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
9993 | and then Present (Defining_Identifier (N)) |
9994 | and then T = Full_View (Defining_Identifier (N)) | |
9995 | then | |
9996 | return True; | |
9997 | end if; | |
9998 | ||
9999 | Next (N); | |
10000 | end loop; | |
10001 | ||
10002 | return False; | |
10003 | end Visible_Part_Type; | |
10004 | ||
5d37ba92 | 10005 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
10006 | |
10007 | begin | |
5d37ba92 ES |
10008 | Is_Primitive := False; |
10009 | ||
996ae0b0 RK |
10010 | if not Comes_From_Source (S) then |
10011 | null; | |
10012 | ||
5d37ba92 | 10013 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
10014 | |
10015 | elsif Current_Scope = Standard_Standard then | |
10016 | null; | |
10017 | ||
b9b2405f | 10018 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 10019 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 10020 | or else Is_Overriding |
996ae0b0 | 10021 | then |
07fc65c4 | 10022 | -- For function, check return type |
996ae0b0 | 10023 | |
07fc65c4 | 10024 | if Ekind (S) = E_Function then |
5d37ba92 ES |
10025 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
10026 | F_Typ := Designated_Type (Etype (S)); | |
10027 | else | |
10028 | F_Typ := Etype (S); | |
10029 | end if; | |
10030 | ||
10031 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 10032 | |
5d37ba92 ES |
10033 | if Scope (B_Typ) = Current_Scope |
10034 | and then not Is_Class_Wide_Type (B_Typ) | |
10035 | and then not Is_Generic_Type (B_Typ) | |
10036 | then | |
10037 | Is_Primitive := True; | |
07fc65c4 | 10038 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 10039 | Set_Is_Primitive (S); |
07fc65c4 GB |
10040 | Check_Private_Overriding (B_Typ); |
10041 | end if; | |
996ae0b0 RK |
10042 | end if; |
10043 | ||
07fc65c4 | 10044 | -- For all subprograms, check formals |
996ae0b0 | 10045 | |
07fc65c4 | 10046 | Formal := First_Formal (S); |
996ae0b0 RK |
10047 | while Present (Formal) loop |
10048 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
10049 | F_Typ := Designated_Type (Etype (Formal)); | |
10050 | else | |
10051 | F_Typ := Etype (Formal); | |
10052 | end if; | |
10053 | ||
07fc65c4 GB |
10054 | B_Typ := Base_Type (F_Typ); |
10055 | ||
ec4867fa ES |
10056 | if Ekind (B_Typ) = E_Access_Subtype then |
10057 | B_Typ := Base_Type (B_Typ); | |
10058 | end if; | |
10059 | ||
5d37ba92 ES |
10060 | if Scope (B_Typ) = Current_Scope |
10061 | and then not Is_Class_Wide_Type (B_Typ) | |
10062 | and then not Is_Generic_Type (B_Typ) | |
10063 | then | |
10064 | Is_Primitive := True; | |
10065 | Set_Is_Primitive (S); | |
07fc65c4 GB |
10066 | Set_Has_Primitive_Operations (B_Typ); |
10067 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
10068 | end if; |
10069 | ||
10070 | Next_Formal (Formal); | |
10071 | end loop; | |
1aee1fb3 AC |
10072 | |
10073 | -- Special case: An equality function can be redefined for a type | |
10074 | -- occurring in a declarative part, and won't otherwise be treated as | |
10075 | -- a primitive because it doesn't occur in a package spec and doesn't | |
10076 | -- override an inherited subprogram. It's important that we mark it | |
10077 | -- primitive so it can be returned by Collect_Primitive_Operations | |
10078 | -- and be used in composing the equality operation of later types | |
10079 | -- that have a component of the type. | |
10080 | ||
10081 | elsif Chars (S) = Name_Op_Eq | |
10082 | and then Etype (S) = Standard_Boolean | |
10083 | then | |
10084 | B_Typ := Base_Type (Etype (First_Formal (S))); | |
10085 | ||
10086 | if Scope (B_Typ) = Current_Scope | |
10087 | and then | |
10088 | Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ | |
10089 | and then not Is_Limited_Type (B_Typ) | |
10090 | then | |
10091 | Is_Primitive := True; | |
10092 | Set_Is_Primitive (S); | |
10093 | Set_Has_Primitive_Operations (B_Typ); | |
10094 | Check_Private_Overriding (B_Typ); | |
10095 | end if; | |
996ae0b0 | 10096 | end if; |
5d37ba92 ES |
10097 | end Check_For_Primitive_Subprogram; |
10098 | ||
10099 | ----------------------------------- | |
10100 | -- Check_Synchronized_Overriding -- | |
10101 | ----------------------------------- | |
10102 | ||
10103 | procedure Check_Synchronized_Overriding | |
10104 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
10105 | Overridden_Subp : out Entity_Id) |
10106 | is | |
5d37ba92 ES |
10107 | Ifaces_List : Elist_Id; |
10108 | In_Scope : Boolean; | |
10109 | Typ : Entity_Id; | |
10110 | ||
8aa15e3b JM |
10111 | function Matches_Prefixed_View_Profile |
10112 | (Prim_Params : List_Id; | |
10113 | Iface_Params : List_Id) return Boolean; | |
10114 | -- Determine whether a subprogram's parameter profile Prim_Params | |
10115 | -- matches that of a potentially overridden interface subprogram | |
10116 | -- Iface_Params. Also determine if the type of first parameter of | |
10117 | -- Iface_Params is an implemented interface. | |
10118 | ||
8aa15e3b JM |
10119 | ----------------------------------- |
10120 | -- Matches_Prefixed_View_Profile -- | |
10121 | ----------------------------------- | |
10122 | ||
10123 | function Matches_Prefixed_View_Profile | |
10124 | (Prim_Params : List_Id; | |
10125 | Iface_Params : List_Id) return Boolean | |
10126 | is | |
10127 | Iface_Id : Entity_Id; | |
10128 | Iface_Param : Node_Id; | |
10129 | Iface_Typ : Entity_Id; | |
10130 | Prim_Id : Entity_Id; | |
10131 | Prim_Param : Node_Id; | |
10132 | Prim_Typ : Entity_Id; | |
10133 | ||
10134 | function Is_Implemented | |
10135 | (Ifaces_List : Elist_Id; | |
10136 | Iface : Entity_Id) return Boolean; | |
10137 | -- Determine if Iface is implemented by the current task or | |
10138 | -- protected type. | |
10139 | ||
10140 | -------------------- | |
10141 | -- Is_Implemented -- | |
10142 | -------------------- | |
10143 | ||
10144 | function Is_Implemented | |
10145 | (Ifaces_List : Elist_Id; | |
10146 | Iface : Entity_Id) return Boolean | |
10147 | is | |
10148 | Iface_Elmt : Elmt_Id; | |
10149 | ||
10150 | begin | |
10151 | Iface_Elmt := First_Elmt (Ifaces_List); | |
10152 | while Present (Iface_Elmt) loop | |
10153 | if Node (Iface_Elmt) = Iface then | |
10154 | return True; | |
10155 | end if; | |
10156 | ||
10157 | Next_Elmt (Iface_Elmt); | |
10158 | end loop; | |
10159 | ||
10160 | return False; | |
10161 | end Is_Implemented; | |
10162 | ||
10163 | -- Start of processing for Matches_Prefixed_View_Profile | |
10164 | ||
10165 | begin | |
10166 | Iface_Param := First (Iface_Params); | |
10167 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
10168 | ||
10169 | if Is_Access_Type (Iface_Typ) then | |
10170 | Iface_Typ := Designated_Type (Iface_Typ); | |
10171 | end if; | |
10172 | ||
10173 | Prim_Param := First (Prim_Params); | |
10174 | ||
10175 | -- The first parameter of the potentially overridden subprogram | |
10176 | -- must be an interface implemented by Prim. | |
10177 | ||
10178 | if not Is_Interface (Iface_Typ) | |
10179 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
10180 | then | |
10181 | return False; | |
10182 | end if; | |
10183 | ||
10184 | -- The checks on the object parameters are done, move onto the | |
10185 | -- rest of the parameters. | |
10186 | ||
10187 | if not In_Scope then | |
10188 | Prim_Param := Next (Prim_Param); | |
10189 | end if; | |
10190 | ||
10191 | Iface_Param := Next (Iface_Param); | |
10192 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
10193 | Iface_Id := Defining_Identifier (Iface_Param); | |
10194 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
10195 | ||
8aa15e3b JM |
10196 | Prim_Id := Defining_Identifier (Prim_Param); |
10197 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
10198 | ||
15e4986c JM |
10199 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
10200 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
10201 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
10202 | then | |
10203 | Iface_Typ := Designated_Type (Iface_Typ); | |
10204 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
10205 | end if; |
10206 | ||
10207 | -- Case of multiple interface types inside a parameter profile | |
10208 | ||
10209 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
10210 | ||
10211 | -- If the interface type is implemented, then the matching type | |
10212 | -- in the primitive should be the implementing record type. | |
10213 | ||
10214 | if Ekind (Iface_Typ) = E_Record_Type | |
10215 | and then Is_Interface (Iface_Typ) | |
10216 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
10217 | then | |
10218 | if Prim_Typ /= Typ then | |
10219 | return False; | |
10220 | end if; | |
10221 | ||
10222 | -- The two parameters must be both mode and subtype conformant | |
10223 | ||
10224 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
10225 | or else not | |
10226 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
10227 | then | |
10228 | return False; | |
10229 | end if; | |
10230 | ||
10231 | Next (Iface_Param); | |
10232 | Next (Prim_Param); | |
10233 | end loop; | |
10234 | ||
10235 | -- One of the two lists contains more parameters than the other | |
10236 | ||
10237 | if Present (Iface_Param) or else Present (Prim_Param) then | |
10238 | return False; | |
10239 | end if; | |
10240 | ||
10241 | return True; | |
10242 | end Matches_Prefixed_View_Profile; | |
10243 | ||
10244 | -- Start of processing for Check_Synchronized_Overriding | |
10245 | ||
5d37ba92 ES |
10246 | begin |
10247 | Overridden_Subp := Empty; | |
10248 | ||
8aa15e3b JM |
10249 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
10250 | -- primitives internally generated by the frontend; however at this | |
10251 | -- stage predefined primitives are still not fully decorated. As a | |
10252 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 10253 | |
8aa15e3b JM |
10254 | if (Ekind (Def_Id) /= E_Entry |
10255 | and then Ekind (Def_Id) /= E_Function | |
10256 | and then Ekind (Def_Id) /= E_Procedure) | |
10257 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
10258 | then |
10259 | return; | |
10260 | end if; | |
10261 | ||
10262 | -- Search for the concurrent declaration since it contains the list | |
10263 | -- of all implemented interfaces. In this case, the subprogram is | |
10264 | -- declared within the scope of a protected or a task type. | |
10265 | ||
10266 | if Present (Scope (Def_Id)) | |
10267 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
10268 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
10269 | then | |
10270 | Typ := Scope (Def_Id); | |
10271 | In_Scope := True; | |
10272 | ||
8aa15e3b | 10273 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 10274 | -- has no formals. |
8aa15e3b JM |
10275 | |
10276 | elsif No (First_Formal (Def_Id)) then | |
10277 | return; | |
5d37ba92 | 10278 | |
8aa15e3b | 10279 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 10280 | -- concurrent type. |
5d37ba92 | 10281 | |
8aa15e3b JM |
10282 | else |
10283 | Typ := Etype (First_Formal (Def_Id)); | |
10284 | ||
10285 | if Is_Access_Type (Typ) then | |
10286 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
10287 | end if; |
10288 | ||
8aa15e3b JM |
10289 | if Is_Concurrent_Type (Typ) |
10290 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 10291 | then |
5d37ba92 ES |
10292 | In_Scope := False; |
10293 | ||
10294 | -- This case occurs when the concurrent type is declared within | |
10295 | -- a generic unit. As a result the corresponding record has been | |
10296 | -- built and used as the type of the first formal, we just have | |
10297 | -- to retrieve the corresponding concurrent type. | |
10298 | ||
8aa15e3b | 10299 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 10300 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 10301 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 10302 | then |
8aa15e3b | 10303 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
10304 | In_Scope := False; |
10305 | ||
10306 | else | |
10307 | return; | |
10308 | end if; | |
8aa15e3b JM |
10309 | end if; |
10310 | ||
10311 | -- There is no overriding to check if is an inherited operation in a | |
10312 | -- type derivation on for a generic actual. | |
10313 | ||
10314 | Collect_Interfaces (Typ, Ifaces_List); | |
10315 | ||
10316 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
10317 | return; |
10318 | end if; | |
10319 | ||
8aa15e3b JM |
10320 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
10321 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 10322 | |
8aa15e3b JM |
10323 | declare |
10324 | Candidate : Entity_Id := Empty; | |
10325 | Hom : Entity_Id := Empty; | |
10326 | Iface_Typ : Entity_Id; | |
10327 | Subp : Entity_Id := Empty; | |
10328 | ||
10329 | begin | |
4adf3c50 | 10330 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
10331 | -- overridden subprogram that belongs to an implemented |
10332 | -- interface. | |
10333 | ||
10334 | Hom := Current_Entity_In_Scope (Def_Id); | |
10335 | while Present (Hom) loop | |
10336 | Subp := Hom; | |
10337 | ||
15e4986c JM |
10338 | if Subp = Def_Id |
10339 | or else not Is_Overloadable (Subp) | |
10340 | or else not Is_Primitive (Subp) | |
10341 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 10342 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 10343 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 10344 | then |
15e4986c | 10345 | null; |
8aa15e3b | 10346 | |
15e4986c | 10347 | -- Entries and procedures can override abstract or null |
4adf3c50 | 10348 | -- interface procedures. |
8aa15e3b | 10349 | |
15e4986c | 10350 | elsif (Ekind (Def_Id) = E_Procedure |
8fde064e | 10351 | or else Ekind (Def_Id) = E_Entry) |
8aa15e3b | 10352 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
10353 | and then Matches_Prefixed_View_Profile |
10354 | (Parameter_Specifications (Parent (Def_Id)), | |
10355 | Parameter_Specifications (Parent (Subp))) | |
10356 | then | |
10357 | Candidate := Subp; | |
10358 | ||
15e4986c JM |
10359 | -- For an overridden subprogram Subp, check whether the mode |
10360 | -- of its first parameter is correct depending on the kind | |
10361 | -- of synchronized type. | |
8aa15e3b | 10362 | |
15e4986c JM |
10363 | declare |
10364 | Formal : constant Node_Id := First_Formal (Candidate); | |
10365 | ||
10366 | begin | |
10367 | -- In order for an entry or a protected procedure to | |
10368 | -- override, the first parameter of the overridden | |
10369 | -- routine must be of mode "out", "in out" or | |
10370 | -- access-to-variable. | |
10371 | ||
8fde064e | 10372 | if Ekind_In (Candidate, E_Entry, E_Procedure) |
15e4986c JM |
10373 | and then Is_Protected_Type (Typ) |
10374 | and then Ekind (Formal) /= E_In_Out_Parameter | |
10375 | and then Ekind (Formal) /= E_Out_Parameter | |
8fde064e AC |
10376 | and then Nkind (Parameter_Type (Parent (Formal))) /= |
10377 | N_Access_Definition | |
15e4986c JM |
10378 | then |
10379 | null; | |
10380 | ||
10381 | -- All other cases are OK since a task entry or routine | |
10382 | -- does not have a restriction on the mode of the first | |
10383 | -- parameter of the overridden interface routine. | |
10384 | ||
10385 | else | |
10386 | Overridden_Subp := Candidate; | |
10387 | return; | |
10388 | end if; | |
10389 | end; | |
8aa15e3b JM |
10390 | |
10391 | -- Functions can override abstract interface functions | |
10392 | ||
10393 | elsif Ekind (Def_Id) = E_Function | |
10394 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
10395 | and then Matches_Prefixed_View_Profile |
10396 | (Parameter_Specifications (Parent (Def_Id)), | |
10397 | Parameter_Specifications (Parent (Subp))) | |
10398 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
10399 | Etype (Result_Definition (Parent (Subp))) | |
10400 | then | |
10401 | Overridden_Subp := Subp; | |
10402 | return; | |
10403 | end if; | |
10404 | ||
10405 | Hom := Homonym (Hom); | |
10406 | end loop; | |
10407 | ||
4adf3c50 AC |
10408 | -- After examining all candidates for overriding, we are left with |
10409 | -- the best match which is a mode incompatible interface routine. | |
10410 | -- Do not emit an error if the Expander is active since this error | |
10411 | -- will be detected later on after all concurrent types are | |
10412 | -- expanded and all wrappers are built. This check is meant for | |
10413 | -- spec-only compilations. | |
8aa15e3b | 10414 | |
4adf3c50 | 10415 | if Present (Candidate) and then not Expander_Active then |
8aa15e3b JM |
10416 | Iface_Typ := |
10417 | Find_Parameter_Type (Parent (First_Formal (Candidate))); | |
10418 | ||
4adf3c50 AC |
10419 | -- Def_Id is primitive of a protected type, declared inside the |
10420 | -- type, and the candidate is primitive of a limited or | |
10421 | -- synchronized interface. | |
8aa15e3b JM |
10422 | |
10423 | if In_Scope | |
10424 | and then Is_Protected_Type (Typ) | |
10425 | and then | |
10426 | (Is_Limited_Interface (Iface_Typ) | |
c199ccf7 AC |
10427 | or else Is_Protected_Interface (Iface_Typ) |
10428 | or else Is_Synchronized_Interface (Iface_Typ) | |
10429 | or else Is_Task_Interface (Iface_Typ)) | |
8aa15e3b | 10430 | then |
dd54644b | 10431 | Error_Msg_PT (Parent (Typ), Candidate); |
8aa15e3b | 10432 | end if; |
5d37ba92 | 10433 | end if; |
8aa15e3b JM |
10434 | |
10435 | Overridden_Subp := Candidate; | |
10436 | return; | |
10437 | end; | |
5d37ba92 ES |
10438 | end Check_Synchronized_Overriding; |
10439 | ||
10440 | ---------------------------- | |
10441 | -- Is_Private_Declaration -- | |
10442 | ---------------------------- | |
10443 | ||
10444 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
10445 | Priv_Decls : List_Id; | |
10446 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
10447 | ||
10448 | begin | |
10449 | if Is_Package_Or_Generic_Package (Current_Scope) | |
10450 | and then In_Private_Part (Current_Scope) | |
10451 | then | |
10452 | Priv_Decls := | |
d12b19fa | 10453 | Private_Declarations (Package_Specification (Current_Scope)); |
5d37ba92 ES |
10454 | |
10455 | return In_Package_Body (Current_Scope) | |
10456 | or else | |
10457 | (Is_List_Member (Decl) | |
a4901c08 | 10458 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 10459 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
10460 | and then not |
10461 | Is_Compilation_Unit | |
10462 | (Defining_Entity (Parent (Decl))) | |
10463 | and then List_Containing (Parent (Parent (Decl))) = | |
10464 | Priv_Decls); | |
5d37ba92 ES |
10465 | else |
10466 | return False; | |
10467 | end if; | |
10468 | end Is_Private_Declaration; | |
996ae0b0 | 10469 | |
2ddc2000 AC |
10470 | -------------------------- |
10471 | -- Is_Overriding_Alias -- | |
10472 | -------------------------- | |
10473 | ||
10474 | function Is_Overriding_Alias | |
10475 | (Old_E : Entity_Id; | |
10476 | New_E : Entity_Id) return Boolean | |
10477 | is | |
10478 | AO : constant Entity_Id := Alias (Old_E); | |
10479 | AN : constant Entity_Id := Alias (New_E); | |
10480 | ||
10481 | begin | |
10482 | return Scope (AO) /= Scope (AN) | |
10483 | or else No (DTC_Entity (AO)) | |
10484 | or else No (DTC_Entity (AN)) | |
10485 | or else DT_Position (AO) = DT_Position (AN); | |
10486 | end Is_Overriding_Alias; | |
10487 | ||
996ae0b0 RK |
10488 | -- Start of processing for New_Overloaded_Entity |
10489 | ||
10490 | begin | |
fbf5a39b AC |
10491 | -- We need to look for an entity that S may override. This must be a |
10492 | -- homonym in the current scope, so we look for the first homonym of | |
10493 | -- S in the current scope as the starting point for the search. | |
10494 | ||
10495 | E := Current_Entity_In_Scope (S); | |
10496 | ||
947430d5 AC |
10497 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
10498 | -- They are directly added to the list of primitive operations of | |
10499 | -- Derived_Type, unless this is a rederivation in the private part | |
10500 | -- of an operation that was already derived in the visible part of | |
10501 | -- the current package. | |
10502 | ||
0791fbe9 | 10503 | if Ada_Version >= Ada_2005 |
947430d5 AC |
10504 | and then Present (Derived_Type) |
10505 | and then Present (Alias (S)) | |
10506 | and then Is_Dispatching_Operation (Alias (S)) | |
10507 | and then Present (Find_Dispatching_Type (Alias (S))) | |
10508 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
10509 | then | |
10510 | -- For private types, when the full-view is processed we propagate to | |
10511 | -- the full view the non-overridden entities whose attribute "alias" | |
10512 | -- references an interface primitive. These entities were added by | |
10513 | -- Derive_Subprograms to ensure that interface primitives are | |
10514 | -- covered. | |
10515 | ||
10516 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
10517 | -- internal entity that links an interface primitive with its | |
10518 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 10519 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
10520 | |
10521 | if Inside_Freezing_Actions = 0 | |
10522 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
10523 | and then In_Private_Part (Current_Scope) | |
10524 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
10525 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
10526 | and then Full_View (Defining_Identifier (Parent (E))) | |
10527 | = Defining_Identifier (Parent (S)) | |
10528 | and then Alias (E) = Alias (S) | |
10529 | then | |
10530 | Check_Operation_From_Private_View (S, E); | |
10531 | Set_Is_Dispatching_Operation (S); | |
10532 | ||
10533 | -- Common case | |
10534 | ||
10535 | else | |
10536 | Enter_Overloaded_Entity (S); | |
10537 | Check_Dispatching_Operation (S, Empty); | |
10538 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
10539 | end if; | |
10540 | ||
10541 | return; | |
10542 | end if; | |
10543 | ||
fbf5a39b AC |
10544 | -- If there is no homonym then this is definitely not overriding |
10545 | ||
996ae0b0 RK |
10546 | if No (E) then |
10547 | Enter_Overloaded_Entity (S); | |
10548 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 10549 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 10550 | |
2995860f AC |
10551 | -- If subprogram has an explicit declaration, check whether it has an |
10552 | -- overriding indicator. | |
758c442c | 10553 | |
ec4867fa | 10554 | if Comes_From_Source (S) then |
8aa15e3b | 10555 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
10556 | |
10557 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
10558 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 10559 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
10560 | -- overriding indicator. |
10561 | ||
10562 | if Ada_Version >= Ada_2012 | |
10563 | and then No (Overridden_Subp) | |
10564 | and then Is_Dispatching_Operation (S) | |
038140ed | 10565 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
10566 | then |
10567 | Overridden_Subp := Overridden_Operation (S); | |
10568 | end if; | |
10569 | ||
5d37ba92 ES |
10570 | Check_Overriding_Indicator |
10571 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
758c442c GD |
10572 | end if; |
10573 | ||
fbf5a39b AC |
10574 | -- If there is a homonym that is not overloadable, then we have an |
10575 | -- error, except for the special cases checked explicitly below. | |
10576 | ||
996ae0b0 RK |
10577 | elsif not Is_Overloadable (E) then |
10578 | ||
10579 | -- Check for spurious conflict produced by a subprogram that has the | |
10580 | -- same name as that of the enclosing generic package. The conflict | |
10581 | -- occurs within an instance, between the subprogram and the renaming | |
10582 | -- declaration for the package. After the subprogram, the package | |
10583 | -- renaming declaration becomes hidden. | |
10584 | ||
10585 | if Ekind (E) = E_Package | |
10586 | and then Present (Renamed_Object (E)) | |
10587 | and then Renamed_Object (E) = Current_Scope | |
10588 | and then Nkind (Parent (Renamed_Object (E))) = | |
10589 | N_Package_Specification | |
10590 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
10591 | then | |
10592 | Set_Is_Hidden (E); | |
10593 | Set_Is_Immediately_Visible (E, False); | |
10594 | Enter_Overloaded_Entity (S); | |
10595 | Set_Homonym (S, Homonym (E)); | |
10596 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 10597 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
10598 | |
10599 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
10600 | -- declaration. However if it is dispatching, it must appear in the |
10601 | -- dispatch table anyway, because it can be dispatched to even if it | |
10602 | -- cannot be called directly. | |
996ae0b0 | 10603 | |
4adf3c50 | 10604 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
10605 | Set_Scope (S, Current_Scope); |
10606 | ||
10607 | if Is_Dispatching_Operation (Alias (S)) then | |
10608 | Check_Dispatching_Operation (S, Empty); | |
10609 | end if; | |
10610 | ||
10611 | return; | |
10612 | ||
10613 | else | |
10614 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 10615 | |
f3d57416 | 10616 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
10617 | |
10618 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
10619 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
10620 | Error_Msg_N ("\& conflicts with declaration#", S); | |
10621 | else | |
10622 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
10623 | end if; |
10624 | ||
10625 | return; | |
10626 | end if; | |
10627 | ||
fbf5a39b AC |
10628 | -- E exists and is overloadable |
10629 | ||
996ae0b0 | 10630 | else |
8aa15e3b | 10631 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 10632 | |
82c80734 RD |
10633 | -- Loop through E and its homonyms to determine if any of them is |
10634 | -- the candidate for overriding by S. | |
996ae0b0 RK |
10635 | |
10636 | while Present (E) loop | |
fbf5a39b AC |
10637 | |
10638 | -- Definitely not interesting if not in the current scope | |
10639 | ||
996ae0b0 RK |
10640 | if Scope (E) /= Current_Scope then |
10641 | null; | |
10642 | ||
aca90db9 AC |
10643 | -- A function can overload the name of an abstract state. The |
10644 | -- state can be viewed as a function with a profile that cannot | |
10645 | -- be matched by anything. | |
10646 | ||
10647 | elsif Ekind (S) = E_Function | |
10648 | and then Ekind (E) = E_Abstract_State | |
10649 | then | |
10650 | Enter_Overloaded_Entity (S); | |
10651 | return; | |
10652 | ||
2995860f AC |
10653 | -- Ada 2012 (AI05-0165): For internally generated bodies of null |
10654 | -- procedures locate the internally generated spec. We enforce | |
10655 | -- mode conformance since a tagged type may inherit from | |
10656 | -- interfaces several null primitives which differ only in | |
10657 | -- the mode of the formals. | |
25ebc085 AC |
10658 | |
10659 | elsif not Comes_From_Source (S) | |
10660 | and then Is_Null_Procedure (S) | |
10661 | and then not Mode_Conformant (E, S) | |
10662 | then | |
10663 | null; | |
10664 | ||
fbf5a39b AC |
10665 | -- Check if we have type conformance |
10666 | ||
ec4867fa | 10667 | elsif Type_Conformant (E, S) then |
c8ef728f | 10668 | |
82c80734 RD |
10669 | -- If the old and new entities have the same profile and one |
10670 | -- is not the body of the other, then this is an error, unless | |
10671 | -- one of them is implicitly declared. | |
996ae0b0 RK |
10672 | |
10673 | -- There are some cases when both can be implicit, for example | |
10674 | -- when both a literal and a function that overrides it are | |
f3d57416 | 10675 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 10676 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 10677 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 10678 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
10679 | -- the former, and the literal is always the former. In the |
10680 | -- odd case where both are derived operations declared at the | |
10681 | -- same point, both operations should be declared, and in that | |
10682 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
10683 | -- part. This can only occur for certain obscure cases in |
10684 | -- instances, when an operation on a type derived from a formal | |
10685 | -- private type does not override a homograph inherited from | |
10686 | -- the actual. In subsequent derivations of such a type, the | |
10687 | -- DT positions of these operations remain distinct, if they | |
10688 | -- have been set. | |
996ae0b0 RK |
10689 | |
10690 | if Present (Alias (S)) | |
10691 | and then (No (Alias (E)) | |
10692 | or else Comes_From_Source (E) | |
2ddc2000 | 10693 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
10694 | or else |
10695 | (Is_Dispatching_Operation (E) | |
2ddc2000 | 10696 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 10697 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 10698 | then |
82c80734 RD |
10699 | -- When an derived operation is overloaded it may be due to |
10700 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
10701 | -- re-inherits. It has to be dealt with. |
10702 | ||
e660dbf7 | 10703 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
10704 | and then In_Private_Part (Current_Scope) |
10705 | then | |
10706 | Check_Operation_From_Private_View (S, E); | |
10707 | end if; | |
10708 | ||
038140ed AC |
10709 | -- In any case the implicit operation remains hidden by the |
10710 | -- existing declaration, which is overriding. Indicate that | |
10711 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 10712 | |
038140ed AC |
10713 | if Present (Alias (S)) then |
10714 | Set_Overridden_Operation (E, Alias (S)); | |
10715 | else | |
10716 | Set_Overridden_Operation (E, S); | |
10717 | end if; | |
758c442c GD |
10718 | |
10719 | if Comes_From_Source (E) then | |
5d37ba92 | 10720 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
758c442c GD |
10721 | end if; |
10722 | ||
996ae0b0 RK |
10723 | return; |
10724 | ||
26a43556 AC |
10725 | -- Within an instance, the renaming declarations for actual |
10726 | -- subprograms may become ambiguous, but they do not hide each | |
10727 | -- other. | |
996ae0b0 RK |
10728 | |
10729 | elsif Ekind (E) /= E_Entry | |
10730 | and then not Comes_From_Source (E) | |
10731 | and then not Is_Generic_Instance (E) | |
10732 | and then (Present (Alias (E)) | |
10733 | or else Is_Intrinsic_Subprogram (E)) | |
10734 | and then (not In_Instance | |
10735 | or else No (Parent (E)) | |
10736 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 10737 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 10738 | then |
26a43556 AC |
10739 | -- A subprogram child unit is not allowed to override an |
10740 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
10741 | |
10742 | if Is_Child_Unit (S) then | |
10743 | Error_Msg_N | |
10744 | ("child unit overrides inherited subprogram in parent", | |
10745 | S); | |
10746 | return; | |
10747 | end if; | |
10748 | ||
10749 | if Is_Non_Overriding_Operation (E, S) then | |
10750 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 10751 | |
c8ef728f | 10752 | if No (Derived_Type) |
996ae0b0 RK |
10753 | or else Is_Tagged_Type (Derived_Type) |
10754 | then | |
10755 | Check_Dispatching_Operation (S, Empty); | |
10756 | end if; | |
10757 | ||
10758 | return; | |
10759 | end if; | |
10760 | ||
10761 | -- E is a derived operation or an internal operator which | |
10762 | -- is being overridden. Remove E from further visibility. | |
10763 | -- Furthermore, if E is a dispatching operation, it must be | |
10764 | -- replaced in the list of primitive operations of its type | |
10765 | -- (see Override_Dispatching_Operation). | |
10766 | ||
ec4867fa | 10767 | Overridden_Subp := E; |
758c442c | 10768 | |
996ae0b0 RK |
10769 | declare |
10770 | Prev : Entity_Id; | |
10771 | ||
10772 | begin | |
10773 | Prev := First_Entity (Current_Scope); | |
8fde064e | 10774 | while Present (Prev) and then Next_Entity (Prev) /= E loop |
996ae0b0 RK |
10775 | Next_Entity (Prev); |
10776 | end loop; | |
10777 | ||
10778 | -- It is possible for E to be in the current scope and | |
10779 | -- yet not in the entity chain. This can only occur in a | |
10780 | -- generic context where E is an implicit concatenation | |
10781 | -- in the formal part, because in a generic body the | |
10782 | -- entity chain starts with the formals. | |
10783 | ||
10784 | pragma Assert | |
10785 | (Present (Prev) or else Chars (E) = Name_Op_Concat); | |
10786 | ||
10787 | -- E must be removed both from the entity_list of the | |
10788 | -- current scope, and from the visibility chain | |
10789 | ||
10790 | if Debug_Flag_E then | |
10791 | Write_Str ("Override implicit operation "); | |
10792 | Write_Int (Int (E)); | |
10793 | Write_Eol; | |
10794 | end if; | |
10795 | ||
10796 | -- If E is a predefined concatenation, it stands for four | |
10797 | -- different operations. As a result, a single explicit | |
10798 | -- declaration does not hide it. In a possible ambiguous | |
10799 | -- situation, Disambiguate chooses the user-defined op, | |
10800 | -- so it is correct to retain the previous internal one. | |
10801 | ||
10802 | if Chars (E) /= Name_Op_Concat | |
10803 | or else Ekind (E) /= E_Operator | |
10804 | then | |
10805 | -- For nondispatching derived operations that are | |
10806 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
10807 | -- part of a package, we retain the derived subprogram |
10808 | -- but mark it as not immediately visible. If the | |
10809 | -- derived operation was declared in the visible part | |
10810 | -- then this ensures that it will still be visible | |
10811 | -- outside the package with the proper signature | |
10812 | -- (calls from outside must also be directed to this | |
10813 | -- version rather than the overriding one, unlike the | |
10814 | -- dispatching case). Calls from inside the package | |
10815 | -- will still resolve to the overriding subprogram | |
10816 | -- since the derived one is marked as not visible | |
10817 | -- within the package. | |
996ae0b0 RK |
10818 | |
10819 | -- If the private operation is dispatching, we achieve | |
10820 | -- the overriding by keeping the implicit operation | |
9865d858 | 10821 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
10822 | -- this fashion the proper body is executed in all |
10823 | -- cases, but the original signature is used outside | |
10824 | -- of the package. | |
10825 | ||
10826 | -- If the overriding is not in the private part, we | |
10827 | -- remove the implicit operation altogether. | |
10828 | ||
10829 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
10830 | if not Is_Dispatching_Operation (E) then |
10831 | Set_Is_Immediately_Visible (E, False); | |
10832 | else | |
e895b435 | 10833 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 10834 | -- so nothing else needs to be done here. |
996ae0b0 RK |
10835 | |
10836 | null; | |
10837 | end if; | |
996ae0b0 | 10838 | |
fbf5a39b AC |
10839 | else |
10840 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
10841 | |
10842 | if E = Current_Entity (E) then | |
10843 | Prev_Vis := Empty; | |
10844 | else | |
10845 | Prev_Vis := Current_Entity (E); | |
10846 | while Homonym (Prev_Vis) /= E loop | |
10847 | Prev_Vis := Homonym (Prev_Vis); | |
10848 | end loop; | |
10849 | end if; | |
10850 | ||
10851 | if Prev_Vis /= Empty then | |
10852 | ||
10853 | -- Skip E in the visibility chain | |
10854 | ||
10855 | Set_Homonym (Prev_Vis, Homonym (E)); | |
10856 | ||
10857 | else | |
10858 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
10859 | end if; | |
10860 | ||
10861 | Set_Next_Entity (Prev, Next_Entity (E)); | |
10862 | ||
10863 | if No (Next_Entity (Prev)) then | |
10864 | Set_Last_Entity (Current_Scope, Prev); | |
10865 | end if; | |
996ae0b0 RK |
10866 | end if; |
10867 | end if; | |
10868 | ||
10869 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
10870 | |
10871 | -- For entities generated by Derive_Subprograms the | |
10872 | -- overridden operation is the inherited primitive | |
10873 | -- (which is available through the attribute alias). | |
10874 | ||
10875 | if not (Comes_From_Source (E)) | |
10876 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
10877 | and then Find_Dispatching_Type (E) = |
10878 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
10879 | and then Present (Alias (E)) |
10880 | and then Comes_From_Source (Alias (E)) | |
10881 | then | |
10882 | Set_Overridden_Operation (S, Alias (E)); | |
2fe829ae | 10883 | |
6320f5e1 AC |
10884 | -- Normal case of setting entity as overridden |
10885 | ||
10886 | -- Note: Static_Initialization and Overridden_Operation | |
10887 | -- attributes use the same field in subprogram entities. | |
10888 | -- Static_Initialization is only defined for internal | |
10889 | -- initialization procedures, where Overridden_Operation | |
10890 | -- is irrelevant. Therefore the setting of this attribute | |
10891 | -- must check whether the target is an init_proc. | |
10892 | ||
2fe829ae | 10893 | elsif not Is_Init_Proc (S) then |
1c1289e7 AC |
10894 | Set_Overridden_Operation (S, E); |
10895 | end if; | |
10896 | ||
5d37ba92 | 10897 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 10898 | |
fc53fe76 | 10899 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
10900 | -- expanded to override an inherited null procedure, or a |
10901 | -- predefined dispatching primitive then indicate that E | |
038140ed | 10902 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
10903 | |
10904 | if Comes_From_Source (S) | |
10905 | or else | |
10906 | (Present (Parent (S)) | |
10907 | and then | |
10908 | Nkind (Parent (S)) = N_Procedure_Specification | |
10909 | and then | |
10910 | Null_Present (Parent (S))) | |
38ef8ebe AC |
10911 | or else |
10912 | (Present (Alias (E)) | |
f16e8df9 RD |
10913 | and then |
10914 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 10915 | then |
c8ef728f | 10916 | if Present (Alias (E)) then |
41251c60 | 10917 | Set_Overridden_Operation (S, Alias (E)); |
41251c60 JM |
10918 | end if; |
10919 | end if; | |
10920 | ||
996ae0b0 | 10921 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 10922 | |
82c80734 | 10923 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 10924 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
10925 | |
10926 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
10927 | Check_Dispatching_Operation (S, E); |
10928 | ||
996ae0b0 RK |
10929 | else |
10930 | Check_Dispatching_Operation (S, Empty); | |
10931 | end if; | |
10932 | ||
5d37ba92 ES |
10933 | Check_For_Primitive_Subprogram |
10934 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
10935 | goto Check_Inequality; |
10936 | end; | |
10937 | ||
10938 | -- Apparent redeclarations in instances can occur when two | |
10939 | -- formal types get the same actual type. The subprograms in | |
10940 | -- in the instance are legal, even if not callable from the | |
10941 | -- outside. Calls from within are disambiguated elsewhere. | |
10942 | -- For dispatching operations in the visible part, the usual | |
10943 | -- rules apply, and operations with the same profile are not | |
10944 | -- legal (B830001). | |
10945 | ||
10946 | elsif (In_Instance_Visible_Part | |
10947 | and then not Is_Dispatching_Operation (E)) | |
10948 | or else In_Instance_Not_Visible | |
10949 | then | |
10950 | null; | |
10951 | ||
10952 | -- Here we have a real error (identical profile) | |
10953 | ||
10954 | else | |
10955 | Error_Msg_Sloc := Sloc (E); | |
10956 | ||
10957 | -- Avoid cascaded errors if the entity appears in | |
10958 | -- subsequent calls. | |
10959 | ||
10960 | Set_Scope (S, Current_Scope); | |
10961 | ||
5d37ba92 ES |
10962 | -- Generate error, with extra useful warning for the case |
10963 | -- of a generic instance with no completion. | |
996ae0b0 RK |
10964 | |
10965 | if Is_Generic_Instance (S) | |
10966 | and then not Has_Completion (E) | |
10967 | then | |
10968 | Error_Msg_N | |
5d37ba92 ES |
10969 | ("instantiation cannot provide body for&", S); |
10970 | Error_Msg_N ("\& conflicts with declaration#", S); | |
10971 | else | |
10972 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
10973 | end if; |
10974 | ||
10975 | return; | |
10976 | end if; | |
10977 | ||
10978 | else | |
c8ef728f ES |
10979 | -- If one subprogram has an access parameter and the other |
10980 | -- a parameter of an access type, calls to either might be | |
10981 | -- ambiguous. Verify that parameters match except for the | |
10982 | -- access parameter. | |
10983 | ||
10984 | if May_Hide_Profile then | |
10985 | declare | |
ec4867fa ES |
10986 | F1 : Entity_Id; |
10987 | F2 : Entity_Id; | |
8dbd1460 | 10988 | |
c8ef728f ES |
10989 | begin |
10990 | F1 := First_Formal (S); | |
10991 | F2 := First_Formal (E); | |
10992 | while Present (F1) and then Present (F2) loop | |
10993 | if Is_Access_Type (Etype (F1)) then | |
10994 | if not Is_Access_Type (Etype (F2)) | |
10995 | or else not Conforming_Types | |
10996 | (Designated_Type (Etype (F1)), | |
10997 | Designated_Type (Etype (F2)), | |
10998 | Type_Conformant) | |
10999 | then | |
11000 | May_Hide_Profile := False; | |
11001 | end if; | |
11002 | ||
11003 | elsif | |
11004 | not Conforming_Types | |
11005 | (Etype (F1), Etype (F2), Type_Conformant) | |
11006 | then | |
11007 | May_Hide_Profile := False; | |
11008 | end if; | |
11009 | ||
11010 | Next_Formal (F1); | |
11011 | Next_Formal (F2); | |
11012 | end loop; | |
11013 | ||
11014 | if May_Hide_Profile | |
11015 | and then No (F1) | |
11016 | and then No (F2) | |
11017 | then | |
dbfeb4fa | 11018 | Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
c8ef728f ES |
11019 | end if; |
11020 | end; | |
11021 | end if; | |
996ae0b0 RK |
11022 | end if; |
11023 | ||
996ae0b0 RK |
11024 | E := Homonym (E); |
11025 | end loop; | |
11026 | ||
11027 | -- On exit, we know that S is a new entity | |
11028 | ||
11029 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
11030 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
11031 | Check_Overriding_Indicator | |
11032 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 11033 | |
c4d67e2d | 11034 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 11035 | |
c4d67e2d AC |
11036 | if Nkind (S) /= N_Defining_Operator_Symbol then |
11037 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
11038 | Check_SPARK_Restriction | |
11039 | ("overloading not allowed with entity#", S); | |
11040 | end if; | |
8ed68165 | 11041 | |
82c80734 RD |
11042 | -- If S is a derived operation for an untagged type then by |
11043 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
11044 | -- operation was dispatching), so Check_Dispatching_Operation is not |
11045 | -- called in that case. | |
996ae0b0 | 11046 | |
c8ef728f | 11047 | if No (Derived_Type) |
996ae0b0 RK |
11048 | or else Is_Tagged_Type (Derived_Type) |
11049 | then | |
11050 | Check_Dispatching_Operation (S, Empty); | |
11051 | end if; | |
11052 | end if; | |
11053 | ||
82c80734 RD |
11054 | -- If this is a user-defined equality operator that is not a derived |
11055 | -- subprogram, create the corresponding inequality. If the operation is | |
11056 | -- dispatching, the expansion is done elsewhere, and we do not create | |
11057 | -- an explicit inequality operation. | |
996ae0b0 RK |
11058 | |
11059 | <<Check_Inequality>> | |
11060 | if Chars (S) = Name_Op_Eq | |
11061 | and then Etype (S) = Standard_Boolean | |
11062 | and then Present (Parent (S)) | |
11063 | and then not Is_Dispatching_Operation (S) | |
11064 | then | |
11065 | Make_Inequality_Operator (S); | |
b2834fbd | 11066 | Check_Untagged_Equality (S); |
996ae0b0 | 11067 | end if; |
996ae0b0 RK |
11068 | end New_Overloaded_Entity; |
11069 | ||
11070 | --------------------- | |
11071 | -- Process_Formals -- | |
11072 | --------------------- | |
11073 | ||
11074 | procedure Process_Formals | |
07fc65c4 | 11075 | (T : List_Id; |
996ae0b0 RK |
11076 | Related_Nod : Node_Id) |
11077 | is | |
11078 | Param_Spec : Node_Id; | |
11079 | Formal : Entity_Id; | |
11080 | Formal_Type : Entity_Id; | |
11081 | Default : Node_Id; | |
11082 | Ptype : Entity_Id; | |
11083 | ||
800621e0 RD |
11084 | Num_Out_Params : Nat := 0; |
11085 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 11086 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 11087 | |
7b56a91b | 11088 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
950d217a AC |
11089 | -- Determine whether an access type designates a type coming from a |
11090 | -- limited view. | |
11091 | ||
07fc65c4 | 11092 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
11093 | -- Check whether the default has a class-wide type. After analysis the |
11094 | -- default has the type of the formal, so we must also check explicitly | |
11095 | -- for an access attribute. | |
07fc65c4 | 11096 | |
7b56a91b AC |
11097 | ---------------------------------- |
11098 | -- Designates_From_Limited_With -- | |
11099 | ---------------------------------- | |
950d217a | 11100 | |
7b56a91b | 11101 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
950d217a AC |
11102 | Desig : Entity_Id := Typ; |
11103 | ||
11104 | begin | |
11105 | if Is_Access_Type (Desig) then | |
11106 | Desig := Directly_Designated_Type (Desig); | |
11107 | end if; | |
11108 | ||
11109 | if Is_Class_Wide_Type (Desig) then | |
11110 | Desig := Root_Type (Desig); | |
11111 | end if; | |
11112 | ||
11113 | return | |
7b56a91b AC |
11114 | Ekind (Desig) = E_Incomplete_Type |
11115 | and then From_Limited_With (Desig); | |
11116 | end Designates_From_Limited_With; | |
950d217a | 11117 | |
07fc65c4 GB |
11118 | --------------------------- |
11119 | -- Is_Class_Wide_Default -- | |
11120 | --------------------------- | |
11121 | ||
11122 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
11123 | begin | |
11124 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
11125 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
11126 | and then Attribute_Name (D) = Name_Access |
11127 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
11128 | end Is_Class_Wide_Default; |
11129 | ||
11130 | -- Start of processing for Process_Formals | |
11131 | ||
996ae0b0 RK |
11132 | begin |
11133 | -- In order to prevent premature use of the formals in the same formal | |
11134 | -- part, the Ekind is left undefined until all default expressions are | |
11135 | -- analyzed. The Ekind is established in a separate loop at the end. | |
11136 | ||
11137 | Param_Spec := First (T); | |
996ae0b0 | 11138 | while Present (Param_Spec) loop |
996ae0b0 | 11139 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 11140 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
11141 | Enter_Name (Formal); |
11142 | ||
11143 | -- Case of ordinary parameters | |
11144 | ||
11145 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
11146 | Find_Type (Parameter_Type (Param_Spec)); | |
11147 | Ptype := Parameter_Type (Param_Spec); | |
11148 | ||
11149 | if Ptype = Error then | |
11150 | goto Continue; | |
11151 | end if; | |
11152 | ||
11153 | Formal_Type := Entity (Ptype); | |
11154 | ||
ec4867fa ES |
11155 | if Is_Incomplete_Type (Formal_Type) |
11156 | or else | |
11157 | (Is_Class_Wide_Type (Formal_Type) | |
8fde064e | 11158 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
996ae0b0 | 11159 | then |
93bcda23 AC |
11160 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
11161 | -- primitive operations, as long as their completion is | |
11162 | -- in the same declarative part. If in the private part | |
11163 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
11164 | -- Check is done on package exit. For access to subprograms, |
11165 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 11166 | |
6eddd7b4 AC |
11167 | -- Ada 2012: tagged incomplete types are allowed as generic |
11168 | -- formal types. They do not introduce dependencies and the | |
11169 | -- corresponding generic subprogram does not have a delayed | |
5b6f12c7 AC |
11170 | -- freeze, because it does not need a freeze node. However, |
11171 | -- it is still the case that untagged incomplete types cannot | |
11172 | -- be Taft-amendment types and must be completed in private | |
11173 | -- part, so the subprogram must appear in the list of private | |
11174 | -- dependents of the type. | |
11175 | ||
11176 | if Is_Tagged_Type (Formal_Type) | |
11177 | or else Ada_Version >= Ada_2012 | |
11178 | then | |
93bcda23 | 11179 | if Ekind (Scope (Current_Scope)) = E_Package |
7b56a91b | 11180 | and then not From_Limited_With (Formal_Type) |
6eddd7b4 | 11181 | and then not Is_Generic_Type (Formal_Type) |
93bcda23 AC |
11182 | and then not Is_Class_Wide_Type (Formal_Type) |
11183 | then | |
cec29135 ES |
11184 | if not Nkind_In |
11185 | (Parent (T), N_Access_Function_Definition, | |
11186 | N_Access_Procedure_Definition) | |
11187 | then | |
11188 | Append_Elmt | |
11189 | (Current_Scope, | |
11190 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
11191 | |
11192 | -- Freezing is delayed to ensure that Register_Prim | |
11193 | -- will get called for this operation, which is needed | |
11194 | -- in cases where static dispatch tables aren't built. | |
11195 | -- (Note that the same is done for controlling access | |
11196 | -- parameter cases in function Access_Definition.) | |
11197 | ||
11198 | Set_Has_Delayed_Freeze (Current_Scope); | |
cec29135 | 11199 | end if; |
93bcda23 | 11200 | end if; |
fbf5a39b | 11201 | |
0a36105d JM |
11202 | -- Special handling of Value_Type for CIL case |
11203 | ||
11204 | elsif Is_Value_Type (Formal_Type) then | |
11205 | null; | |
11206 | ||
800621e0 RD |
11207 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
11208 | N_Access_Procedure_Definition) | |
996ae0b0 | 11209 | then |
dd386db0 AC |
11210 | -- AI05-0151: Tagged incomplete types are allowed in all |
11211 | -- formal parts. Untagged incomplete types are not allowed | |
11212 | -- in bodies. | |
11213 | ||
11214 | if Ada_Version >= Ada_2012 then | |
11215 | if Is_Tagged_Type (Formal_Type) then | |
11216 | null; | |
11217 | ||
0f1a6a0b AC |
11218 | elsif Nkind_In (Parent (Parent (T)), N_Accept_Statement, |
11219 | N_Entry_Body, | |
11220 | N_Subprogram_Body) | |
dd386db0 AC |
11221 | then |
11222 | Error_Msg_NE | |
11223 | ("invalid use of untagged incomplete type&", | |
0f1a6a0b | 11224 | Ptype, Formal_Type); |
dd386db0 AC |
11225 | end if; |
11226 | ||
11227 | else | |
11228 | Error_Msg_NE | |
11229 | ("invalid use of incomplete type&", | |
0f1a6a0b | 11230 | Param_Spec, Formal_Type); |
dd386db0 AC |
11231 | |
11232 | -- Further checks on the legality of incomplete types | |
11233 | -- in formal parts are delayed until the freeze point | |
11234 | -- of the enclosing subprogram or access to subprogram. | |
11235 | end if; | |
996ae0b0 RK |
11236 | end if; |
11237 | ||
11238 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
11239 | Error_Msg_NE |
11240 | ("premature use of&", | |
11241 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
11242 | end if; |
11243 | ||
fecbd779 AC |
11244 | -- Ada 2012 (AI-142): Handle aliased parameters |
11245 | ||
11246 | if Ada_Version >= Ada_2012 | |
11247 | and then Aliased_Present (Param_Spec) | |
11248 | then | |
11249 | Set_Is_Aliased (Formal); | |
11250 | end if; | |
11251 | ||
0ab80019 | 11252 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 11253 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
11254 | -- formal in the enclosing scope. Finally, replace the parameter |
11255 | -- type of the formal with the internal subtype. | |
7324bf49 | 11256 | |
0791fbe9 | 11257 | if Ada_Version >= Ada_2005 |
41251c60 | 11258 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 11259 | then |
ec4867fa | 11260 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 11261 | Error_Msg_N |
0a36105d JM |
11262 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
11263 | ||
ec4867fa ES |
11264 | else |
11265 | if Can_Never_Be_Null (Formal_Type) | |
11266 | and then Comes_From_Source (Related_Nod) | |
11267 | then | |
ed2233dc | 11268 | Error_Msg_NE |
0a36105d | 11269 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 11270 | Param_Spec, Formal_Type); |
ec4867fa | 11271 | end if; |
41251c60 | 11272 | |
ec4867fa ES |
11273 | Formal_Type := |
11274 | Create_Null_Excluding_Itype | |
11275 | (T => Formal_Type, | |
11276 | Related_Nod => Related_Nod, | |
11277 | Scope_Id => Scope (Current_Scope)); | |
0a36105d | 11278 | |
fcf848c4 AC |
11279 | -- If the designated type of the itype is an itype that is |
11280 | -- not frozen yet, we set the Has_Delayed_Freeze attribute | |
11281 | -- on the access subtype, to prevent order-of-elaboration | |
11282 | -- issues in the backend. | |
0a36105d JM |
11283 | |
11284 | -- Example: | |
11285 | -- type T is access procedure; | |
11286 | -- procedure Op (O : not null T); | |
11287 | ||
fcf848c4 AC |
11288 | if Is_Itype (Directly_Designated_Type (Formal_Type)) |
11289 | and then | |
11290 | not Is_Frozen (Directly_Designated_Type (Formal_Type)) | |
11291 | then | |
0a36105d JM |
11292 | Set_Has_Delayed_Freeze (Formal_Type); |
11293 | end if; | |
ec4867fa | 11294 | end if; |
7324bf49 AC |
11295 | end if; |
11296 | ||
996ae0b0 RK |
11297 | -- An access formal type |
11298 | ||
11299 | else | |
11300 | Formal_Type := | |
11301 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 11302 | |
f937473f RD |
11303 | -- No need to continue if we already notified errors |
11304 | ||
11305 | if not Present (Formal_Type) then | |
11306 | return; | |
11307 | end if; | |
11308 | ||
0ab80019 | 11309 | -- Ada 2005 (AI-254) |
7324bf49 | 11310 | |
af4b9434 AC |
11311 | declare |
11312 | AD : constant Node_Id := | |
11313 | Access_To_Subprogram_Definition | |
11314 | (Parameter_Type (Param_Spec)); | |
11315 | begin | |
11316 | if Present (AD) and then Protected_Present (AD) then | |
11317 | Formal_Type := | |
11318 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 11319 | (Param_Spec); |
af4b9434 AC |
11320 | end if; |
11321 | end; | |
996ae0b0 RK |
11322 | end if; |
11323 | ||
11324 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 11325 | |
fecbd779 AC |
11326 | -- Deal with default expression if present |
11327 | ||
fbf5a39b | 11328 | Default := Expression (Param_Spec); |
996ae0b0 RK |
11329 | |
11330 | if Present (Default) then | |
2ba431e5 | 11331 | Check_SPARK_Restriction |
fe5d3068 | 11332 | ("default expression is not allowed", Default); |
38171f43 | 11333 | |
996ae0b0 | 11334 | if Out_Present (Param_Spec) then |
ed2233dc | 11335 | Error_Msg_N |
996ae0b0 RK |
11336 | ("default initialization only allowed for IN parameters", |
11337 | Param_Spec); | |
11338 | end if; | |
11339 | ||
11340 | -- Do the special preanalysis of the expression (see section on | |
11341 | -- "Handling of Default Expressions" in the spec of package Sem). | |
11342 | ||
21d27997 | 11343 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 11344 | |
f29b857f ES |
11345 | -- An access to constant cannot be the default for |
11346 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
11347 | |
11348 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
11349 | and then not Is_Access_Constant (Formal_Type) | |
11350 | and then Is_Access_Type (Etype (Default)) | |
11351 | and then Is_Access_Constant (Etype (Default)) | |
11352 | then | |
f29b857f ES |
11353 | Error_Msg_N |
11354 | ("formal that is access to variable cannot be initialized " & | |
11355 | "with an access-to-constant expression", Default); | |
2eb160f2 ST |
11356 | end if; |
11357 | ||
d8db0bca JM |
11358 | -- Check that the designated type of an access parameter's default |
11359 | -- is not a class-wide type unless the parameter's designated type | |
11360 | -- is also class-wide. | |
996ae0b0 RK |
11361 | |
11362 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
7b56a91b | 11363 | and then not Designates_From_Limited_With (Formal_Type) |
07fc65c4 | 11364 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
11365 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
11366 | then | |
07fc65c4 GB |
11367 | Error_Msg_N |
11368 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 11369 | end if; |
4755cce9 JM |
11370 | |
11371 | -- Check incorrect use of dynamically tagged expressions | |
11372 | ||
11373 | if Is_Tagged_Type (Formal_Type) then | |
11374 | Check_Dynamically_Tagged_Expression | |
11375 | (Expr => Default, | |
11376 | Typ => Formal_Type, | |
11377 | Related_Nod => Default); | |
11378 | end if; | |
996ae0b0 RK |
11379 | end if; |
11380 | ||
41251c60 JM |
11381 | -- Ada 2005 (AI-231): Static checks |
11382 | ||
0791fbe9 | 11383 | if Ada_Version >= Ada_2005 |
41251c60 JM |
11384 | and then Is_Access_Type (Etype (Formal)) |
11385 | and then Can_Never_Be_Null (Etype (Formal)) | |
11386 | then | |
11387 | Null_Exclusion_Static_Checks (Param_Spec); | |
11388 | end if; | |
11389 | ||
f1bd0415 AC |
11390 | -- The following checks are relevant when SPARK_Mode is on as these |
11391 | -- are not standard Ada legality rules. | |
6c3c671e | 11392 | |
fb1fdf7d | 11393 | if SPARK_Mode = On |
6c3c671e AC |
11394 | and then Ekind_In (Scope (Formal), E_Function, E_Generic_Function) |
11395 | then | |
f1bd0415 AC |
11396 | -- A function cannot have a parameter of mode IN OUT or OUT |
11397 | ||
11398 | if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then | |
11399 | Error_Msg_N | |
11400 | ("function cannot have parameter of mode `OUT` or `IN OUT` " | |
11401 | & "(SPARK RM 6.1)", Formal); | |
11402 | ||
11403 | -- A function cannot have a volatile formal parameter | |
11404 | ||
11405 | elsif Is_SPARK_Volatile_Object (Formal) then | |
11406 | Error_Msg_N | |
8c35b40a AC |
11407 | ("function cannot have a volatile formal parameter " |
11408 | & "(SPARK RM 7.1.3(10))", Formal); | |
f1bd0415 | 11409 | end if; |
6c3c671e AC |
11410 | end if; |
11411 | ||
996ae0b0 RK |
11412 | <<Continue>> |
11413 | Next (Param_Spec); | |
11414 | end loop; | |
11415 | ||
82c80734 RD |
11416 | -- If this is the formal part of a function specification, analyze the |
11417 | -- subtype mark in the context where the formals are visible but not | |
11418 | -- yet usable, and may hide outer homographs. | |
11419 | ||
11420 | if Nkind (Related_Nod) = N_Function_Specification then | |
11421 | Analyze_Return_Type (Related_Nod); | |
11422 | end if; | |
11423 | ||
996ae0b0 RK |
11424 | -- Now set the kind (mode) of each formal |
11425 | ||
11426 | Param_Spec := First (T); | |
996ae0b0 RK |
11427 | while Present (Param_Spec) loop |
11428 | Formal := Defining_Identifier (Param_Spec); | |
11429 | Set_Formal_Mode (Formal); | |
11430 | ||
11431 | if Ekind (Formal) = E_In_Parameter then | |
11432 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
11433 | ||
11434 | if Present (Expression (Param_Spec)) then | |
11435 | Default := Expression (Param_Spec); | |
11436 | ||
11437 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
11438 | if Nkind (Parameter_Type (Param_Spec)) /= |
11439 | N_Access_Definition | |
996ae0b0 RK |
11440 | then |
11441 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 11442 | else |
5ebfaacf AC |
11443 | Formal_Type := |
11444 | Access_Definition | |
11445 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
11446 | end if; |
11447 | ||
11448 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
11449 | end if; | |
2820d220 | 11450 | end if; |
800621e0 RD |
11451 | |
11452 | elsif Ekind (Formal) = E_Out_Parameter then | |
11453 | Num_Out_Params := Num_Out_Params + 1; | |
11454 | ||
11455 | if Num_Out_Params = 1 then | |
11456 | First_Out_Param := Formal; | |
11457 | end if; | |
11458 | ||
11459 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
11460 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
11461 | end if; |
11462 | ||
4172a8e3 AC |
11463 | -- Skip remaining processing if formal type was in error |
11464 | ||
11465 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
11466 | goto Next_Parameter; | |
11467 | end if; | |
11468 | ||
fecbd779 AC |
11469 | -- Force call by reference if aliased |
11470 | ||
11471 | if Is_Aliased (Formal) then | |
11472 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf AC |
11473 | |
11474 | -- Warn if user asked this to be passed by copy | |
11475 | ||
11476 | if Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
11477 | Error_Msg_N | |
dbfeb4fa | 11478 | ("cannot pass aliased parameter & by copy?", Formal); |
5ebfaacf AC |
11479 | end if; |
11480 | ||
11481 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy | |
11482 | ||
11483 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
11484 | Set_Mechanism (Formal, By_Copy); | |
11485 | ||
11486 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Reference then | |
11487 | Set_Mechanism (Formal, By_Reference); | |
fecbd779 AC |
11488 | end if; |
11489 | ||
4172a8e3 | 11490 | <<Next_Parameter>> |
996ae0b0 RK |
11491 | Next (Param_Spec); |
11492 | end loop; | |
800621e0 RD |
11493 | |
11494 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
11495 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
11496 | end if; | |
996ae0b0 RK |
11497 | end Process_Formals; |
11498 | ||
fbf5a39b AC |
11499 | ---------------------------- |
11500 | -- Reference_Body_Formals -- | |
11501 | ---------------------------- | |
11502 | ||
11503 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
11504 | Fs : Entity_Id; | |
11505 | Fb : Entity_Id; | |
11506 | ||
11507 | begin | |
11508 | if Error_Posted (Spec) then | |
11509 | return; | |
11510 | end if; | |
11511 | ||
0a36105d JM |
11512 | -- Iterate over both lists. They may be of different lengths if the two |
11513 | -- specs are not conformant. | |
11514 | ||
fbf5a39b AC |
11515 | Fs := First_Formal (Spec); |
11516 | Fb := First_Formal (Bod); | |
0a36105d | 11517 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
11518 | Generate_Reference (Fs, Fb, 'b'); |
11519 | ||
11520 | if Style_Check then | |
11521 | Style.Check_Identifier (Fb, Fs); | |
11522 | end if; | |
11523 | ||
11524 | Set_Spec_Entity (Fb, Fs); | |
11525 | Set_Referenced (Fs, False); | |
11526 | Next_Formal (Fs); | |
11527 | Next_Formal (Fb); | |
11528 | end loop; | |
11529 | end Reference_Body_Formals; | |
11530 | ||
996ae0b0 RK |
11531 | ------------------------- |
11532 | -- Set_Actual_Subtypes -- | |
11533 | ------------------------- | |
11534 | ||
11535 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
2820d220 AC |
11536 | Decl : Node_Id; |
11537 | Formal : Entity_Id; | |
11538 | T : Entity_Id; | |
11539 | First_Stmt : Node_Id := Empty; | |
11540 | AS_Needed : Boolean; | |
996ae0b0 RK |
11541 | |
11542 | begin | |
f3d57416 | 11543 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
11544 | -- actual subtypes (small optimization). |
11545 | ||
8fde064e | 11546 | if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
fbf5a39b AC |
11547 | return; |
11548 | end if; | |
11549 | ||
996ae0b0 RK |
11550 | Formal := First_Formal (Subp); |
11551 | while Present (Formal) loop | |
11552 | T := Etype (Formal); | |
11553 | ||
e895b435 | 11554 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
11555 | |
11556 | if Is_Constrained (T) then | |
11557 | AS_Needed := False; | |
11558 | ||
82c80734 | 11559 | -- If we have unknown discriminants, then we do not need an actual |
a90bd866 | 11560 | -- subtype, or more accurately we cannot figure it out. Note that |
82c80734 | 11561 | -- all class-wide types have unknown discriminants. |
996ae0b0 RK |
11562 | |
11563 | elsif Has_Unknown_Discriminants (T) then | |
11564 | AS_Needed := False; | |
11565 | ||
82c80734 RD |
11566 | -- At this stage we have an unconstrained type that may need an |
11567 | -- actual subtype. For sure the actual subtype is needed if we have | |
11568 | -- an unconstrained array type. | |
996ae0b0 RK |
11569 | |
11570 | elsif Is_Array_Type (T) then | |
11571 | AS_Needed := True; | |
11572 | ||
d8db0bca JM |
11573 | -- The only other case needing an actual subtype is an unconstrained |
11574 | -- record type which is an IN parameter (we cannot generate actual | |
11575 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
11576 | -- change the discriminant values. However we exclude the case of | |
11577 | -- initialization procedures, since discriminants are handled very | |
11578 | -- specially in this context, see the section entitled "Handling of | |
11579 | -- Discriminants" in Einfo. | |
11580 | ||
11581 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
11582 | -- in front end layout mode for size/offset values), since in such | |
11583 | -- functions only discriminants are referenced, and not only are such | |
11584 | -- subtypes not needed, but they cannot always be generated, because | |
11585 | -- of order of elaboration issues. | |
996ae0b0 RK |
11586 | |
11587 | elsif Is_Record_Type (T) | |
11588 | and then Ekind (Formal) = E_In_Parameter | |
11589 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 11590 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
11591 | and then not Is_Discrim_SO_Function (Subp) |
11592 | then | |
11593 | AS_Needed := True; | |
11594 | ||
11595 | -- All other cases do not need an actual subtype | |
11596 | ||
11597 | else | |
11598 | AS_Needed := False; | |
11599 | end if; | |
11600 | ||
11601 | -- Generate actual subtypes for unconstrained arrays and | |
11602 | -- unconstrained discriminated records. | |
11603 | ||
11604 | if AS_Needed then | |
7324bf49 | 11605 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 11606 | |
57a8057a | 11607 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
11608 | -- variable that renames the corresponding entry of the |
11609 | -- parameter block, and it is this local variable that may | |
da94696d | 11610 | -- require an actual subtype. |
fbf5a39b | 11611 | |
4460a9bc | 11612 | if Expander_Active then |
fbf5a39b AC |
11613 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
11614 | else | |
11615 | Decl := Build_Actual_Subtype (T, Formal); | |
11616 | end if; | |
11617 | ||
996ae0b0 RK |
11618 | if Present (Handled_Statement_Sequence (N)) then |
11619 | First_Stmt := | |
11620 | First (Statements (Handled_Statement_Sequence (N))); | |
11621 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
11622 | Mark_Rewrite_Insertion (Decl); | |
11623 | else | |
82c80734 RD |
11624 | -- If the accept statement has no body, there will be no |
11625 | -- reference to the actuals, so no need to compute actual | |
11626 | -- subtypes. | |
996ae0b0 RK |
11627 | |
11628 | return; | |
11629 | end if; | |
11630 | ||
11631 | else | |
fbf5a39b | 11632 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
11633 | Prepend (Decl, Declarations (N)); |
11634 | Mark_Rewrite_Insertion (Decl); | |
11635 | end if; | |
11636 | ||
82c80734 RD |
11637 | -- The declaration uses the bounds of an existing object, and |
11638 | -- therefore needs no constraint checks. | |
2820d220 | 11639 | |
7324bf49 | 11640 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 11641 | |
996ae0b0 RK |
11642 | -- We need to freeze manually the generated type when it is |
11643 | -- inserted anywhere else than in a declarative part. | |
11644 | ||
11645 | if Present (First_Stmt) then | |
11646 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 11647 | Freeze_Entity (Defining_Identifier (Decl), N)); |
fcadacf7 ES |
11648 | |
11649 | -- Ditto if the type has a dynamic predicate, because the | |
11650 | -- generated function will mention the actual subtype. | |
11651 | ||
11652 | elsif Has_Dynamic_Predicate_Aspect (T) then | |
11653 | Insert_List_Before_And_Analyze (Decl, | |
11654 | Freeze_Entity (Defining_Identifier (Decl), N)); | |
996ae0b0 RK |
11655 | end if; |
11656 | ||
fbf5a39b | 11657 | if Nkind (N) = N_Accept_Statement |
4460a9bc | 11658 | and then Expander_Active |
fbf5a39b AC |
11659 | then |
11660 | Set_Actual_Subtype (Renamed_Object (Formal), | |
11661 | Defining_Identifier (Decl)); | |
11662 | else | |
11663 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
11664 | end if; | |
996ae0b0 RK |
11665 | end if; |
11666 | ||
11667 | Next_Formal (Formal); | |
11668 | end loop; | |
11669 | end Set_Actual_Subtypes; | |
11670 | ||
11671 | --------------------- | |
11672 | -- Set_Formal_Mode -- | |
11673 | --------------------- | |
11674 | ||
11675 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
11676 | Spec : constant Node_Id := Parent (Formal_Id); | |
11677 | ||
11678 | begin | |
11679 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
11680 | -- since we ensure that corresponding actuals are always valid at the | |
11681 | -- point of the call. | |
11682 | ||
11683 | if Out_Present (Spec) then | |
996ae0b0 RK |
11684 | if Ekind (Scope (Formal_Id)) = E_Function |
11685 | or else Ekind (Scope (Formal_Id)) = E_Generic_Function | |
11686 | then | |
b4ca2d2c | 11687 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
11688 | |
11689 | if Ada_Version >= Ada_2012 then | |
e6425869 AC |
11690 | |
11691 | -- Even in Ada 2012 operators can only have IN parameters | |
11692 | ||
11693 | if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then | |
11694 | Error_Msg_N ("operators can only have IN parameters", Spec); | |
11695 | end if; | |
11696 | ||
c56a9ba4 AC |
11697 | if In_Present (Spec) then |
11698 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
11699 | else | |
11700 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
11701 | end if; | |
11702 | ||
b4ca2d2c AC |
11703 | -- But not in earlier versions of Ada |
11704 | ||
c56a9ba4 AC |
11705 | else |
11706 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
11707 | Set_Ekind (Formal_Id, E_In_Parameter); | |
11708 | end if; | |
996ae0b0 RK |
11709 | |
11710 | elsif In_Present (Spec) then | |
11711 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
11712 | ||
11713 | else | |
fbf5a39b AC |
11714 | Set_Ekind (Formal_Id, E_Out_Parameter); |
11715 | Set_Never_Set_In_Source (Formal_Id, True); | |
11716 | Set_Is_True_Constant (Formal_Id, False); | |
11717 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
11718 | end if; |
11719 | ||
11720 | else | |
11721 | Set_Ekind (Formal_Id, E_In_Parameter); | |
11722 | end if; | |
11723 | ||
fbf5a39b | 11724 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
11725 | -- guarantees that access parameters are always non-null. We also set |
11726 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
11727 | |
11728 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 11729 | |
885c4871 | 11730 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 11731 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 11732 | |
0791fbe9 | 11733 | if Ada_Version < Ada_2005 |
2813bb6b | 11734 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
11735 | then |
11736 | Set_Is_Known_Non_Null (Formal_Id); | |
11737 | Set_Can_Never_Be_Null (Formal_Id); | |
11738 | end if; | |
2813bb6b | 11739 | |
41251c60 JM |
11740 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
11741 | ||
2813bb6b ES |
11742 | elsif Is_Access_Type (Etype (Formal_Id)) |
11743 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
11744 | then | |
2813bb6b | 11745 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
11746 | |
11747 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
11748 | -- access checks) for the case of an IN parameter, which cannot | |
11749 | -- be changed, or for an IN OUT parameter, which can be changed but | |
11750 | -- not to a null value. But for an OUT parameter, the initial value | |
11751 | -- passed in can be null, so we can't set this flag in that case. | |
11752 | ||
11753 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
11754 | Set_Can_Never_Be_Null (Formal_Id); | |
11755 | end if; | |
fbf5a39b AC |
11756 | end if; |
11757 | ||
996ae0b0 RK |
11758 | Set_Mechanism (Formal_Id, Default_Mechanism); |
11759 | Set_Formal_Validity (Formal_Id); | |
11760 | end Set_Formal_Mode; | |
11761 | ||
11762 | ------------------------- | |
11763 | -- Set_Formal_Validity -- | |
11764 | ------------------------- | |
11765 | ||
11766 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
11767 | begin | |
82c80734 RD |
11768 | -- If no validity checking, then we cannot assume anything about the |
11769 | -- validity of parameters, since we do not know there is any checking | |
11770 | -- of the validity on the call side. | |
996ae0b0 RK |
11771 | |
11772 | if not Validity_Checks_On then | |
11773 | return; | |
11774 | ||
fbf5a39b AC |
11775 | -- If validity checking for parameters is enabled, this means we are |
11776 | -- not supposed to make any assumptions about argument values. | |
11777 | ||
11778 | elsif Validity_Check_Parameters then | |
11779 | return; | |
11780 | ||
11781 | -- If we are checking in parameters, we will assume that the caller is | |
11782 | -- also checking parameters, so we can assume the parameter is valid. | |
11783 | ||
996ae0b0 RK |
11784 | elsif Ekind (Formal_Id) = E_In_Parameter |
11785 | and then Validity_Check_In_Params | |
11786 | then | |
11787 | Set_Is_Known_Valid (Formal_Id, True); | |
11788 | ||
fbf5a39b AC |
11789 | -- Similar treatment for IN OUT parameters |
11790 | ||
996ae0b0 RK |
11791 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
11792 | and then Validity_Check_In_Out_Params | |
11793 | then | |
11794 | Set_Is_Known_Valid (Formal_Id, True); | |
11795 | end if; | |
11796 | end Set_Formal_Validity; | |
11797 | ||
11798 | ------------------------ | |
11799 | -- Subtype_Conformant -- | |
11800 | ------------------------ | |
11801 | ||
ce2b6ba5 JM |
11802 | function Subtype_Conformant |
11803 | (New_Id : Entity_Id; | |
11804 | Old_Id : Entity_Id; | |
11805 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
11806 | is | |
996ae0b0 | 11807 | Result : Boolean; |
996ae0b0 | 11808 | begin |
ce2b6ba5 JM |
11809 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
11810 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
11811 | return Result; |
11812 | end Subtype_Conformant; | |
11813 | ||
11814 | --------------------- | |
11815 | -- Type_Conformant -- | |
11816 | --------------------- | |
11817 | ||
41251c60 JM |
11818 | function Type_Conformant |
11819 | (New_Id : Entity_Id; | |
11820 | Old_Id : Entity_Id; | |
11821 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
11822 | is | |
996ae0b0 | 11823 | Result : Boolean; |
996ae0b0 | 11824 | begin |
c8ef728f ES |
11825 | May_Hide_Profile := False; |
11826 | ||
41251c60 JM |
11827 | Check_Conformance |
11828 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
11829 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
11830 | return Result; |
11831 | end Type_Conformant; | |
11832 | ||
11833 | ------------------------------- | |
11834 | -- Valid_Operator_Definition -- | |
11835 | ------------------------------- | |
11836 | ||
11837 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
11838 | N : Integer := 0; | |
11839 | F : Entity_Id; | |
11840 | Id : constant Name_Id := Chars (Designator); | |
11841 | N_OK : Boolean; | |
11842 | ||
11843 | begin | |
11844 | F := First_Formal (Designator); | |
996ae0b0 RK |
11845 | while Present (F) loop |
11846 | N := N + 1; | |
11847 | ||
11848 | if Present (Default_Value (F)) then | |
ed2233dc | 11849 | Error_Msg_N |
996ae0b0 RK |
11850 | ("default values not allowed for operator parameters", |
11851 | Parent (F)); | |
11852 | end if; | |
11853 | ||
11854 | Next_Formal (F); | |
11855 | end loop; | |
11856 | ||
11857 | -- Verify that user-defined operators have proper number of arguments | |
11858 | -- First case of operators which can only be unary | |
11859 | ||
b69cd36a | 11860 | if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
996ae0b0 RK |
11861 | N_OK := (N = 1); |
11862 | ||
11863 | -- Case of operators which can be unary or binary | |
11864 | ||
b69cd36a | 11865 | elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
11866 | N_OK := (N in 1 .. 2); |
11867 | ||
11868 | -- All other operators can only be binary | |
11869 | ||
11870 | else | |
11871 | N_OK := (N = 2); | |
11872 | end if; | |
11873 | ||
11874 | if not N_OK then | |
11875 | Error_Msg_N | |
11876 | ("incorrect number of arguments for operator", Designator); | |
11877 | end if; | |
11878 | ||
11879 | if Id = Name_Op_Ne | |
11880 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
11881 | and then not Is_Intrinsic_Subprogram (Designator) | |
11882 | then | |
11883 | Error_Msg_N | |
11884 | ("explicit definition of inequality not allowed", Designator); | |
11885 | end if; | |
11886 | end Valid_Operator_Definition; | |
11887 | ||
11888 | end Sem_Ch6; |