]>
Commit | Line | Data |
---|---|---|
996ae0b0 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M _ C H 6 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
996ae0b0 | 8 | -- -- |
77a40ec1 | 9 | -- Copyright (C) 1992-2014, 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; | |
a6abfd78 AC |
312 | Def : Entity_Id; |
313 | ||
b727a82b AC |
314 | begin |
315 | Formal_Spec := First (Parameter_Specifications (New_Spec)); | |
b2afe274 AC |
316 | |
317 | -- Create a new formal parameter at the same source position | |
318 | ||
b727a82b | 319 | while Present (Formal_Spec) loop |
a6abfd78 AC |
320 | Def := Defining_Identifier (Formal_Spec); |
321 | Set_Defining_Identifier (Formal_Spec, | |
322 | Make_Defining_Identifier (Sloc (Def), | |
323 | Chars => Chars (Def))); | |
b727a82b AC |
324 | Next (Formal_Spec); |
325 | end loop; | |
326 | end; | |
327 | end if; | |
328 | ||
51597c23 | 329 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); |
d2d4b355 AC |
330 | |
331 | -- If there are previous overloadable entities with the same name, | |
332 | -- check whether any of them is completed by the expression function. | |
333 | ||
8a06151a | 334 | if Present (Prev) and then Is_Overloadable (Prev) then |
51597c23 AC |
335 | Def_Id := Analyze_Subprogram_Specification (Spec); |
336 | Prev := Find_Corresponding_Spec (N); | |
d2d4b355 | 337 | end if; |
b0186f71 | 338 | |
b913199e AC |
339 | Ret := Make_Simple_Return_Statement (LocX, Expression (N)); |
340 | ||
b0186f71 AC |
341 | New_Body := |
342 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 343 | Specification => New_Spec, |
b0186f71 AC |
344 | Declarations => Empty_List, |
345 | Handled_Statement_Sequence => | |
346 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 347 | Statements => New_List (Ret))); |
b0186f71 | 348 | |
e7f23f06 AC |
349 | -- If the expression completes a generic subprogram, we must create a |
350 | -- separate node for the body, because at instantiation the original | |
351 | -- node of the generic copy must be a generic subprogram body, and | |
352 | -- cannot be a expression function. Otherwise we just rewrite the | |
353 | -- expression with the non-generic body. | |
354 | ||
6d7e5c54 | 355 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
e7f23f06 | 356 | Insert_After (N, New_Body); |
6d7e5c54 | 357 | |
e7f23f06 AC |
358 | -- Propagate any aspects or pragmas that apply to the expression |
359 | -- function to the proper body when the expression function acts | |
360 | -- as a completion. | |
361 | ||
362 | if Has_Aspects (N) then | |
363 | Move_Aspects (N, To => New_Body); | |
364 | end if; | |
365 | ||
366 | Relocate_Pragmas_To_Body (New_Body); | |
b0186f71 | 367 | |
b0186f71 | 368 | Rewrite (N, Make_Null_Statement (Loc)); |
d2d4b355 | 369 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
370 | Analyze (N); |
371 | Analyze (New_Body); | |
d2b10647 | 372 | Set_Is_Inlined (Prev); |
b0186f71 | 373 | |
8fde064e | 374 | elsif Present (Prev) and then Comes_From_Source (Prev) then |
d2d4b355 | 375 | Set_Has_Completion (Prev, False); |
76264f60 | 376 | |
c6d2191a AC |
377 | -- An expression function that is a completion freezes the |
378 | -- expression. This means freezing the return type, and if it is | |
379 | -- an access type, freezing its designated type as well. | |
1b31321b | 380 | |
c6d2191a | 381 | -- Note that we cannot defer this freezing to the analysis of the |
1b31321b AC |
382 | -- expression itself, because a freeze node might appear in a nested |
383 | -- scope, leading to an elaboration order issue in gigi. | |
c6d2191a AC |
384 | |
385 | Freeze_Before (N, Etype (Prev)); | |
1b31321b | 386 | |
c6d2191a AC |
387 | if Is_Access_Type (Etype (Prev)) then |
388 | Freeze_Before (N, Designated_Type (Etype (Prev))); | |
389 | end if; | |
390 | ||
76264f60 AC |
391 | -- For navigation purposes, indicate that the function is a body |
392 | ||
393 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 394 | Rewrite (N, New_Body); |
e7f23f06 | 395 | |
c0cdbd39 AC |
396 | -- Correct the parent pointer of the aspect specification list to |
397 | -- reference the rewritten node. | |
398 | ||
399 | if Has_Aspects (N) then | |
400 | Set_Parent (Aspect_Specifications (N), N); | |
401 | end if; | |
402 | ||
e7f23f06 AC |
403 | -- Propagate any pragmas that apply to the expression function to the |
404 | -- proper body when the expression function acts as a completion. | |
405 | -- Aspects are automatically transfered because of node rewriting. | |
406 | ||
407 | Relocate_Pragmas_To_Body (N); | |
d2b10647 ES |
408 | Analyze (N); |
409 | ||
6d7e5c54 AC |
410 | -- Prev is the previous entity with the same name, but it is can |
411 | -- be an unrelated spec that is not completed by the expression | |
412 | -- function. In that case the relevant entity is the one in the body. | |
413 | -- Not clear that the backend can inline it in this case ??? | |
414 | ||
415 | if Has_Completion (Prev) then | |
416 | Set_Is_Inlined (Prev); | |
31af8899 AC |
417 | |
418 | -- The formals of the expression function are body formals, | |
419 | -- and do not appear in the ali file, which will only contain | |
420 | -- references to the formals of the original subprogram spec. | |
421 | ||
422 | declare | |
423 | F1 : Entity_Id; | |
424 | F2 : Entity_Id; | |
425 | ||
426 | begin | |
427 | F1 := First_Formal (Def_Id); | |
428 | F2 := First_Formal (Prev); | |
429 | ||
430 | while Present (F1) loop | |
431 | Set_Spec_Entity (F1, F2); | |
432 | Next_Formal (F1); | |
433 | Next_Formal (F2); | |
434 | end loop; | |
435 | end; | |
436 | ||
6d7e5c54 AC |
437 | else |
438 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
439 | end if; | |
440 | ||
0b5b2bbc | 441 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 442 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
443 | |
444 | else | |
a52e6d7e AC |
445 | -- An expression function that is not a completion is not a |
446 | -- subprogram declaration, and thus cannot appear in a protected | |
447 | -- definition. | |
448 | ||
449 | if Nkind (Parent (N)) = N_Protected_Definition then | |
450 | Error_Msg_N | |
451 | ("an expression function is not a legal protected operation", N); | |
452 | end if; | |
453 | ||
d2b10647 | 454 | New_Decl := |
d2d4b355 | 455 | Make_Subprogram_Declaration (Loc, Specification => Spec); |
804ff4c3 | 456 | |
d2b10647 | 457 | Rewrite (N, New_Decl); |
c0cdbd39 AC |
458 | |
459 | -- Correct the parent pointer of the aspect specification list to | |
460 | -- reference the rewritten node. | |
461 | ||
462 | if Has_Aspects (N) then | |
463 | Set_Parent (Aspect_Specifications (N), N); | |
464 | end if; | |
465 | ||
b0186f71 | 466 | Analyze (N); |
d2b10647 ES |
467 | Set_Is_Inlined (Defining_Entity (New_Decl)); |
468 | ||
6d7e5c54 AC |
469 | -- To prevent premature freeze action, insert the new body at the end |
470 | -- of the current declarations, or at the end of the package spec. | |
b913199e | 471 | -- However, resolve usage names now, to prevent spurious visibility |
ad4e3362 ES |
472 | -- on later entities. Note that the function can now be called in |
473 | -- the current declarative part, which will appear to be prior to | |
474 | -- the presence of the body in the code. There are nevertheless no | |
475 | -- order of elaboration issues because all name resolution has taken | |
476 | -- place at the point of declaration. | |
6d7e5c54 AC |
477 | |
478 | declare | |
e876c43a AC |
479 | Decls : List_Id := List_Containing (N); |
480 | Par : constant Node_Id := Parent (Decls); | |
b913199e | 481 | Id : constant Entity_Id := Defining_Entity (New_Decl); |
6d7e5c54 AC |
482 | |
483 | begin | |
484 | if Nkind (Par) = N_Package_Specification | |
8fde064e AC |
485 | and then Decls = Visible_Declarations (Par) |
486 | and then Present (Private_Declarations (Par)) | |
487 | and then not Is_Empty_List (Private_Declarations (Par)) | |
6d7e5c54 AC |
488 | then |
489 | Decls := Private_Declarations (Par); | |
490 | end if; | |
491 | ||
492 | Insert_After (Last (Decls), New_Body); | |
b913199e AC |
493 | Push_Scope (Id); |
494 | Install_Formals (Id); | |
3a8e3f63 | 495 | |
d8a764c4 AC |
496 | -- Preanalyze the expression for name capture, except in an |
497 | -- instance, where this has been done during generic analysis, | |
498 | -- and will be redone when analyzing the body. | |
845f06e2 AC |
499 | |
500 | declare | |
4058ddcc AC |
501 | Expr : constant Node_Id := Expression (Ret); |
502 | ||
845f06e2 AC |
503 | begin |
504 | Set_Parent (Expr, Ret); | |
4058ddcc | 505 | |
d8a764c4 AC |
506 | if not In_Instance then |
507 | Preanalyze_Spec_Expression (Expr, Etype (Id)); | |
508 | end if; | |
845f06e2 | 509 | end; |
3a8e3f63 | 510 | |
b913199e | 511 | End_Scope; |
6d7e5c54 | 512 | end; |
b0186f71 | 513 | end if; |
0b5b2bbc AC |
514 | |
515 | -- If the return expression is a static constant, we suppress warning | |
516 | -- messages on unused formals, which in most cases will be noise. | |
517 | ||
518 | Set_Is_Trivial_Subprogram (Defining_Entity (New_Body), | |
519 | Is_OK_Static_Expression (Expr)); | |
b0186f71 AC |
520 | end Analyze_Expression_Function; |
521 | ||
ec4867fa ES |
522 | ---------------------------------------- |
523 | -- Analyze_Extended_Return_Statement -- | |
524 | ---------------------------------------- | |
525 | ||
526 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
527 | begin | |
c86cf714 | 528 | Check_Compiler_Unit ("extended return statement", N); |
5d37ba92 | 529 | Analyze_Return_Statement (N); |
ec4867fa ES |
530 | end Analyze_Extended_Return_Statement; |
531 | ||
996ae0b0 RK |
532 | ---------------------------- |
533 | -- Analyze_Function_Call -- | |
534 | ---------------------------- | |
535 | ||
536 | procedure Analyze_Function_Call (N : Node_Id) is | |
a7e68e7f HK |
537 | Actuals : constant List_Id := Parameter_Associations (N); |
538 | Func_Nam : constant Node_Id := Name (N); | |
539 | Actual : Node_Id; | |
540 | ||
996ae0b0 | 541 | begin |
a7e68e7f | 542 | Analyze (Func_Nam); |
996ae0b0 | 543 | |
3e7302c3 AC |
544 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
545 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
546 | -- has been analyzed and we just return. | |
82c80734 | 547 | |
a7e68e7f HK |
548 | if Nkind (Func_Nam) = N_Selected_Component |
549 | and then Name (N) /= Func_Nam | |
82c80734 RD |
550 | and then Is_Rewrite_Substitution (N) |
551 | and then Present (Etype (N)) | |
552 | then | |
553 | return; | |
554 | end if; | |
555 | ||
996ae0b0 RK |
556 | -- If error analyzing name, then set Any_Type as result type and return |
557 | ||
a7e68e7f | 558 | if Etype (Func_Nam) = Any_Type then |
996ae0b0 RK |
559 | Set_Etype (N, Any_Type); |
560 | return; | |
561 | end if; | |
562 | ||
563 | -- Otherwise analyze the parameters | |
564 | ||
e24329cd YM |
565 | if Present (Actuals) then |
566 | Actual := First (Actuals); | |
996ae0b0 RK |
567 | while Present (Actual) loop |
568 | Analyze (Actual); | |
569 | Check_Parameterless_Call (Actual); | |
570 | Next (Actual); | |
571 | end loop; | |
572 | end if; | |
573 | ||
574 | Analyze_Call (N); | |
996ae0b0 RK |
575 | end Analyze_Function_Call; |
576 | ||
ec4867fa ES |
577 | ----------------------------- |
578 | -- Analyze_Function_Return -- | |
579 | ----------------------------- | |
580 | ||
581 | procedure Analyze_Function_Return (N : Node_Id) is | |
a7e68e7f HK |
582 | Loc : constant Source_Ptr := Sloc (N); |
583 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
584 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
ec4867fa | 585 | |
5d37ba92 | 586 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
587 | -- Function result subtype |
588 | ||
589 | procedure Check_Limited_Return (Expr : Node_Id); | |
590 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
591 | -- limited types. Used only for simple return statements. | |
592 | -- Expr is the expression returned. | |
593 | ||
594 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
595 | -- Check that the return_subtype_indication properly matches the result | |
596 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
597 | ||
598 | -------------------------- | |
599 | -- Check_Limited_Return -- | |
600 | -------------------------- | |
601 | ||
602 | procedure Check_Limited_Return (Expr : Node_Id) is | |
603 | begin | |
604 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
605 | -- removed and replaced by anonymous access results. This is an | |
606 | -- incompatibility with Ada 95. Not clear whether this should be | |
607 | -- enforced yet or perhaps controllable with special switch. ??? | |
608 | ||
ce72a9a3 AC |
609 | -- A limited interface that is not immutably limited is OK. |
610 | ||
611 | if Is_Limited_Interface (R_Type) | |
612 | and then | |
613 | not (Is_Task_Interface (R_Type) | |
614 | or else Is_Protected_Interface (R_Type) | |
615 | or else Is_Synchronized_Interface (R_Type)) | |
616 | then | |
617 | null; | |
618 | ||
619 | elsif Is_Limited_Type (R_Type) | |
620 | and then not Is_Interface (R_Type) | |
ec4867fa ES |
621 | and then Comes_From_Source (N) |
622 | and then not In_Instance_Body | |
2a31c32b | 623 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
624 | then |
625 | -- Error in Ada 2005 | |
626 | ||
0791fbe9 | 627 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
628 | and then not Debug_Flag_Dot_L |
629 | and then not GNAT_Mode | |
630 | then | |
631 | Error_Msg_N | |
632 | ("(Ada 2005) cannot copy object of a limited type " & | |
5d37ba92 | 633 | "(RM-2005 6.5(5.5/2))", Expr); |
e0ae93e2 | 634 | |
51245e2d | 635 | if Is_Limited_View (R_Type) then |
ec4867fa ES |
636 | Error_Msg_N |
637 | ("\return by reference not permitted in Ada 2005", Expr); | |
638 | end if; | |
639 | ||
640 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
641 | -- incompatibility. | |
642 | ||
643 | -- In GNAT mode, this is just a warning, to allow it to be | |
644 | -- evilly turned off. Otherwise it is a real error. | |
645 | ||
9694c039 AC |
646 | -- In a generic context, simplify the warning because it makes |
647 | -- no sense to discuss pass-by-reference or copy. | |
648 | ||
ec4867fa | 649 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
650 | if Inside_A_Generic then |
651 | Error_Msg_N | |
885c4871 | 652 | ("return of limited object not permitted in Ada 2005 " |
dbfeb4fa | 653 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
9694c039 | 654 | |
51245e2d | 655 | elsif Is_Limited_View (R_Type) then |
ec4867fa | 656 | Error_Msg_N |
20261dc1 | 657 | ("return by reference not permitted in Ada 2005 " |
dbfeb4fa | 658 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
659 | else |
660 | Error_Msg_N | |
20261dc1 | 661 | ("cannot copy object of a limited type in Ada 2005 " |
dbfeb4fa | 662 | & "(RM-2005 6.5(5.5/2))?y?", Expr); |
ec4867fa ES |
663 | end if; |
664 | ||
665 | -- Ada 95 mode, compatibility warnings disabled | |
666 | ||
667 | else | |
668 | return; -- skip continuation messages below | |
669 | end if; | |
670 | ||
9694c039 AC |
671 | if not Inside_A_Generic then |
672 | Error_Msg_N | |
673 | ("\consider switching to return of access type", Expr); | |
674 | Explain_Limited_Type (R_Type, Expr); | |
675 | end if; | |
ec4867fa ES |
676 | end if; |
677 | end Check_Limited_Return; | |
678 | ||
679 | ------------------------------------- | |
680 | -- Check_Return_Subtype_Indication -- | |
681 | ------------------------------------- | |
682 | ||
683 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
684 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
685 | ||
686 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
687 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
688 | |
689 | Subtype_Ind : constant Node_Id := | |
690 | Object_Definition (Original_Node (Obj_Decl)); | |
691 | ||
7f568bfa AC |
692 | R_Type_Is_Anon_Access : constant Boolean := |
693 | Ekind_In (R_Type, | |
694 | E_Anonymous_Access_Subprogram_Type, | |
695 | E_Anonymous_Access_Protected_Subprogram_Type, | |
696 | E_Anonymous_Access_Type); | |
ec4867fa ES |
697 | -- True if return type of the function is an anonymous access type |
698 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
699 | ||
7f568bfa AC |
700 | R_Stm_Type_Is_Anon_Access : constant Boolean := |
701 | Ekind_In (R_Stm_Type, | |
702 | E_Anonymous_Access_Subprogram_Type, | |
703 | E_Anonymous_Access_Protected_Subprogram_Type, | |
704 | E_Anonymous_Access_Type); | |
ec4867fa ES |
705 | -- True if type of the return object is an anonymous access type |
706 | ||
7f568bfa AC |
707 | procedure Error_No_Match (N : Node_Id); |
708 | -- Output error messages for case where types do not statically | |
709 | -- match. N is the location for the messages. | |
710 | ||
711 | -------------------- | |
712 | -- Error_No_Match -- | |
713 | -------------------- | |
714 | ||
715 | procedure Error_No_Match (N : Node_Id) is | |
716 | begin | |
717 | Error_Msg_N | |
718 | ("subtype must statically match function result subtype", N); | |
719 | ||
720 | if not Predicates_Match (R_Stm_Type, R_Type) then | |
721 | Error_Msg_Node_2 := R_Type; | |
722 | Error_Msg_NE | |
723 | ("\predicate of & does not match predicate of &", | |
724 | N, R_Stm_Type); | |
725 | end if; | |
726 | end Error_No_Match; | |
727 | ||
728 | -- Start of processing for Check_Return_Subtype_Indication | |
729 | ||
ec4867fa | 730 | begin |
7665e4bd | 731 | -- First, avoid cascaded errors |
ec4867fa ES |
732 | |
733 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
734 | return; | |
735 | end if; | |
736 | ||
737 | -- "return access T" case; check that the return statement also has | |
738 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 739 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
740 | |
741 | if R_Type_Is_Anon_Access then | |
742 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
743 | if |
744 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 745 | then |
53cf4600 ES |
746 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
747 | Base_Type (Designated_Type (R_Type)) | |
748 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
749 | then | |
7f568bfa | 750 | Error_No_Match (Subtype_Mark (Subtype_Ind)); |
53cf4600 ES |
751 | end if; |
752 | ||
753 | else | |
754 | -- For two anonymous access to subprogram types, the | |
755 | -- types themselves must be type conformant. | |
756 | ||
757 | if not Conforming_Types | |
758 | (R_Stm_Type, R_Type, Fully_Conformant) | |
759 | then | |
7f568bfa | 760 | Error_No_Match (Subtype_Ind); |
53cf4600 | 761 | end if; |
ec4867fa | 762 | end if; |
0a36105d | 763 | |
ec4867fa ES |
764 | else |
765 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
766 | end if; | |
767 | ||
6cce2156 GD |
768 | -- If the return object is of an anonymous access type, then report |
769 | -- an error if the function's result type is not also anonymous. | |
770 | ||
771 | elsif R_Stm_Type_Is_Anon_Access | |
772 | and then not R_Type_Is_Anon_Access | |
773 | then | |
774 | Error_Msg_N ("anonymous access not allowed for function with " & | |
775 | "named access result", Subtype_Ind); | |
776 | ||
81d93365 AC |
777 | -- Subtype indication case: check that the return object's type is |
778 | -- covered by the result type, and that the subtypes statically match | |
779 | -- when the result subtype is constrained. Also handle record types | |
780 | -- with unknown discriminants for which we have built the underlying | |
781 | -- record view. Coverage is needed to allow specific-type return | |
782 | -- objects when the result type is class-wide (see AI05-32). | |
783 | ||
784 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 785 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
786 | and then |
787 | Covers | |
788 | (Base_Type (R_Type), | |
789 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
790 | then |
791 | -- A null exclusion may be present on the return type, on the | |
792 | -- function specification, on the object declaration or on the | |
793 | -- subtype itself. | |
ec4867fa | 794 | |
21d27997 RD |
795 | if Is_Access_Type (R_Type) |
796 | and then | |
797 | (Can_Never_Be_Null (R_Type) | |
798 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
799 | Can_Never_Be_Null (R_Stm_Type) | |
800 | then | |
7f568bfa | 801 | Error_No_Match (Subtype_Ind); |
21d27997 RD |
802 | end if; |
803 | ||
105b5e65 | 804 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
805 | |
806 | if Is_Constrained (R_Type) | |
807 | or else Is_Access_Type (R_Type) | |
808 | then | |
ec4867fa | 809 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
7f568bfa | 810 | Error_No_Match (Subtype_Ind); |
ec4867fa ES |
811 | end if; |
812 | end if; | |
813 | ||
ff7139c3 AC |
814 | elsif Etype (Base_Type (R_Type)) = R_Stm_Type |
815 | and then Is_Null_Extension (Base_Type (R_Type)) | |
816 | then | |
817 | null; | |
818 | ||
ec4867fa ES |
819 | else |
820 | Error_Msg_N | |
821 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
822 | end if; | |
823 | end Check_Return_Subtype_Indication; | |
824 | ||
825 | --------------------- | |
826 | -- Local Variables -- | |
827 | --------------------- | |
828 | ||
829 | Expr : Node_Id; | |
830 | ||
831 | -- Start of processing for Analyze_Function_Return | |
832 | ||
833 | begin | |
834 | Set_Return_Present (Scope_Id); | |
835 | ||
5d37ba92 | 836 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 837 | Expr := Expression (N); |
4ee646da | 838 | |
e917aec2 RD |
839 | -- Guard against a malformed expression. The parser may have tried to |
840 | -- recover but the node is not analyzable. | |
4ee646da AC |
841 | |
842 | if Nkind (Expr) = N_Error then | |
843 | Set_Etype (Expr, Any_Type); | |
844 | Expander_Mode_Save_And_Set (False); | |
845 | return; | |
846 | ||
847 | else | |
0180fd26 AC |
848 | -- The resolution of a controlled [extension] aggregate associated |
849 | -- with a return statement creates a temporary which needs to be | |
850 | -- finalized on function exit. Wrap the return statement inside a | |
851 | -- block so that the finalization machinery can detect this case. | |
852 | -- This early expansion is done only when the return statement is | |
853 | -- not part of a handled sequence of statements. | |
854 | ||
855 | if Nkind_In (Expr, N_Aggregate, | |
856 | N_Extension_Aggregate) | |
857 | and then Needs_Finalization (R_Type) | |
858 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
859 | then | |
860 | Rewrite (N, | |
861 | Make_Block_Statement (Loc, | |
862 | Handled_Statement_Sequence => | |
863 | Make_Handled_Sequence_Of_Statements (Loc, | |
864 | Statements => New_List (Relocate_Node (N))))); | |
865 | ||
866 | Analyze (N); | |
867 | return; | |
868 | end if; | |
869 | ||
4ee646da AC |
870 | Analyze_And_Resolve (Expr, R_Type); |
871 | Check_Limited_Return (Expr); | |
872 | end if; | |
ec4867fa | 873 | |
ad05f2e9 | 874 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 875 | |
fe5d3068 | 876 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
877 | and then |
878 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 879 | or else Present (Next (N))) |
607d0635 | 880 | then |
2ba431e5 | 881 | Check_SPARK_Restriction |
fe5d3068 | 882 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
883 | end if; |
884 | ||
ec4867fa | 885 | else |
2ba431e5 | 886 | Check_SPARK_Restriction ("extended RETURN is not allowed", N); |
607d0635 | 887 | |
ec4867fa ES |
888 | -- Analyze parts specific to extended_return_statement: |
889 | ||
890 | declare | |
de6cad7c | 891 | Obj_Decl : constant Node_Id := |
b9daa96e | 892 | Last (Return_Object_Declarations (N)); |
de6cad7c | 893 | Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
b9daa96e | 894 | HSS : constant Node_Id := Handled_Statement_Sequence (N); |
ec4867fa ES |
895 | |
896 | begin | |
897 | Expr := Expression (Obj_Decl); | |
898 | ||
899 | -- Note: The check for OK_For_Limited_Init will happen in | |
900 | -- Analyze_Object_Declaration; we treat it as a normal | |
901 | -- object declaration. | |
902 | ||
cd1c668b | 903 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
904 | Analyze (Obj_Decl); |
905 | ||
ec4867fa ES |
906 | Check_Return_Subtype_Indication (Obj_Decl); |
907 | ||
908 | if Present (HSS) then | |
909 | Analyze (HSS); | |
910 | ||
911 | if Present (Exception_Handlers (HSS)) then | |
912 | ||
913 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
914 | -- Probably by creating an actual N_Block_Statement. | |
915 | -- Probably in Expand. | |
916 | ||
917 | null; | |
918 | end if; | |
919 | end if; | |
920 | ||
9337aa0a AC |
921 | -- Mark the return object as referenced, since the return is an |
922 | -- implicit reference of the object. | |
923 | ||
924 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
925 | ||
ec4867fa | 926 | Check_References (Stm_Entity); |
de6cad7c AC |
927 | |
928 | -- Check RM 6.5 (5.9/3) | |
929 | ||
930 | if Has_Aliased then | |
931 | if Ada_Version < Ada_2012 then | |
dbfeb4fa RD |
932 | |
933 | -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? | |
934 | -- Can it really happen (extended return???) | |
935 | ||
936 | Error_Msg_N | |
b785e0b8 AC |
937 | ("aliased only allowed for limited return objects " |
938 | & "in Ada 2012??", N); | |
de6cad7c | 939 | |
51245e2d | 940 | elsif not Is_Limited_View (R_Type) then |
de6cad7c AC |
941 | Error_Msg_N ("aliased only allowed for limited" |
942 | & " return objects", N); | |
943 | end if; | |
944 | end if; | |
ec4867fa ES |
945 | end; |
946 | end if; | |
947 | ||
21d27997 | 948 | -- Case of Expr present |
5d37ba92 | 949 | |
ec4867fa | 950 | if Present (Expr) |
21d27997 | 951 | |
8fde064e | 952 | -- Defend against previous errors |
21d27997 RD |
953 | |
954 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 955 | and then Present (Etype (Expr)) |
ec4867fa | 956 | then |
5d37ba92 ES |
957 | -- Apply constraint check. Note that this is done before the implicit |
958 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 959 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
960 | -- with null-excluding expressions found in return statements. |
961 | ||
962 | Apply_Constraint_Check (Expr, R_Type); | |
963 | ||
964 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
965 | -- type, apply an implicit conversion of the expression to that type | |
966 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 967 | |
0791fbe9 | 968 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
969 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
970 | then | |
971 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
972 | Analyze_And_Resolve (Expr, R_Type); | |
b6b5cca8 AC |
973 | |
974 | -- If this is a local anonymous access to subprogram, the | |
975 | -- accessibility check can be applied statically. The return is | |
976 | -- illegal if the access type of the return expression is declared | |
977 | -- inside of the subprogram (except if it is the subtype indication | |
978 | -- of an extended return statement). | |
979 | ||
980 | elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then | |
981 | if not Comes_From_Source (Current_Scope) | |
982 | or else Ekind (Current_Scope) = E_Return_Statement | |
983 | then | |
984 | null; | |
985 | ||
986 | elsif | |
987 | Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) | |
988 | then | |
989 | Error_Msg_N ("cannot return local access to subprogram", N); | |
990 | end if; | |
ec4867fa ES |
991 | end if; |
992 | ||
21d27997 RD |
993 | -- If the result type is class-wide, then check that the return |
994 | -- expression's type is not declared at a deeper level than the | |
995 | -- function (RM05-6.5(5.6/2)). | |
996 | ||
0791fbe9 | 997 | if Ada_Version >= Ada_2005 |
21d27997 RD |
998 | and then Is_Class_Wide_Type (R_Type) |
999 | then | |
1000 | if Type_Access_Level (Etype (Expr)) > | |
1001 | Subprogram_Access_Level (Scope_Id) | |
1002 | then | |
1003 | Error_Msg_N | |
1004 | ("level of return expression type is deeper than " & | |
1005 | "class-wide function!", Expr); | |
1006 | end if; | |
1007 | end if; | |
1008 | ||
4755cce9 JM |
1009 | -- Check incorrect use of dynamically tagged expression |
1010 | ||
1011 | if Is_Tagged_Type (R_Type) then | |
1012 | Check_Dynamically_Tagged_Expression | |
1013 | (Expr => Expr, | |
1014 | Typ => R_Type, | |
1015 | Related_Nod => N); | |
ec4867fa ES |
1016 | end if; |
1017 | ||
ec4867fa ES |
1018 | -- ??? A real run-time accessibility check is needed in cases |
1019 | -- involving dereferences of access parameters. For now we just | |
1020 | -- check the static cases. | |
1021 | ||
0791fbe9 | 1022 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
51245e2d | 1023 | and then Is_Limited_View (Etype (Scope_Id)) |
ec4867fa ES |
1024 | and then Object_Access_Level (Expr) > |
1025 | Subprogram_Access_Level (Scope_Id) | |
1026 | then | |
9694c039 AC |
1027 | -- Suppress the message in a generic, where the rewriting |
1028 | -- is irrelevant. | |
1029 | ||
1030 | if Inside_A_Generic then | |
1031 | null; | |
1032 | ||
1033 | else | |
1034 | Rewrite (N, | |
1035 | Make_Raise_Program_Error (Loc, | |
1036 | Reason => PE_Accessibility_Check_Failed)); | |
1037 | Analyze (N); | |
1038 | ||
43417b90 | 1039 | Error_Msg_Warn := SPARK_Mode /= On; |
4a28b181 AC |
1040 | Error_Msg_N ("cannot return a local value by reference<<", N); |
1041 | Error_Msg_NE ("\& [<<", N, Standard_Program_Error); | |
9694c039 | 1042 | end if; |
ec4867fa | 1043 | end if; |
5d37ba92 ES |
1044 | |
1045 | if Known_Null (Expr) | |
1046 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
1047 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
1048 | then | |
1049 | Apply_Compile_Time_Constraint_Error | |
1050 | (N => Expr, | |
1051 | Msg => "(Ada 2005) null not allowed for " | |
dbfeb4fa | 1052 | & "null-excluding return??", |
5d37ba92 ES |
1053 | Reason => CE_Null_Not_Allowed); |
1054 | end if; | |
ec4867fa ES |
1055 | end if; |
1056 | end Analyze_Function_Return; | |
1057 | ||
996ae0b0 RK |
1058 | ------------------------------------- |
1059 | -- Analyze_Generic_Subprogram_Body -- | |
1060 | ------------------------------------- | |
1061 | ||
1062 | procedure Analyze_Generic_Subprogram_Body | |
1063 | (N : Node_Id; | |
1064 | Gen_Id : Entity_Id) | |
1065 | is | |
fbf5a39b | 1066 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 1067 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 1068 | Body_Id : Entity_Id; |
996ae0b0 | 1069 | New_N : Node_Id; |
fbf5a39b | 1070 | Spec : Node_Id; |
996ae0b0 RK |
1071 | |
1072 | begin | |
82c80734 RD |
1073 | -- Copy body and disable expansion while analyzing the generic For a |
1074 | -- stub, do not copy the stub (which would load the proper body), this | |
1075 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
1076 | |
1077 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
1078 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
1079 | Rewrite (N, New_N); | |
1080 | Start_Generic; | |
1081 | end if; | |
1082 | ||
1083 | Spec := Specification (N); | |
1084 | ||
1085 | -- Within the body of the generic, the subprogram is callable, and | |
1086 | -- behaves like the corresponding non-generic unit. | |
1087 | ||
fbf5a39b | 1088 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
1089 | |
1090 | if Kind = E_Generic_Procedure | |
1091 | and then Nkind (Spec) /= N_Procedure_Specification | |
1092 | then | |
fbf5a39b | 1093 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
1094 | return; |
1095 | ||
1096 | elsif Kind = E_Generic_Function | |
1097 | and then Nkind (Spec) /= N_Function_Specification | |
1098 | then | |
fbf5a39b | 1099 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
1100 | return; |
1101 | end if; | |
1102 | ||
fbf5a39b | 1103 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
1104 | |
1105 | if Has_Completion (Gen_Id) | |
1106 | and then Nkind (Parent (N)) /= N_Subunit | |
1107 | then | |
1108 | Error_Msg_N ("duplicate generic body", N); | |
1109 | return; | |
1110 | else | |
1111 | Set_Has_Completion (Gen_Id); | |
1112 | end if; | |
1113 | ||
1114 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1115 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1116 | else | |
1117 | Set_Corresponding_Spec (N, Gen_Id); | |
1118 | end if; | |
1119 | ||
1120 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1121 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1122 | end if; | |
1123 | ||
1124 | -- Make generic parameters immediately visible in the body. They are | |
1125 | -- needed to process the formals declarations. Then make the formals | |
1126 | -- visible in a separate step. | |
1127 | ||
0a36105d | 1128 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1129 | |
1130 | declare | |
1131 | E : Entity_Id; | |
1132 | First_Ent : Entity_Id; | |
1133 | ||
1134 | begin | |
1135 | First_Ent := First_Entity (Gen_Id); | |
1136 | ||
1137 | E := First_Ent; | |
1138 | while Present (E) and then not Is_Formal (E) loop | |
1139 | Install_Entity (E); | |
1140 | Next_Entity (E); | |
1141 | end loop; | |
1142 | ||
1143 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1144 | ||
1145 | -- Now generic formals are visible, and the specification can be | |
1146 | -- analyzed, for subsequent conformance check. | |
1147 | ||
fbf5a39b | 1148 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1149 | |
fbf5a39b | 1150 | -- Make formal parameters visible |
996ae0b0 RK |
1151 | |
1152 | if Present (E) then | |
1153 | ||
fbf5a39b AC |
1154 | -- E is the first formal parameter, we loop through the formals |
1155 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1156 | |
1157 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1158 | while Present (E) loop |
1159 | Install_Entity (E); | |
1160 | Next_Formal (E); | |
1161 | end loop; | |
1162 | end if; | |
1163 | ||
e895b435 | 1164 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1165 | |
ec4867fa | 1166 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
ea3c0651 | 1167 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
ec4867fa ES |
1168 | Set_Ekind (Body_Id, E_Subprogram_Body); |
1169 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1170 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1171 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
fbf5a39b AC |
1172 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1173 | ||
1174 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1175 | ||
e895b435 | 1176 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1177 | |
1178 | Set_Ekind (Gen_Id, Kind); | |
1179 | Set_Ekind (Body_Id, Kind); | |
1180 | ||
1181 | if Present (First_Ent) then | |
1182 | Set_First_Entity (Gen_Id, First_Ent); | |
1183 | end if; | |
1184 | ||
1185 | End_Scope; | |
1186 | return; | |
1187 | end if; | |
996ae0b0 | 1188 | |
82c80734 RD |
1189 | -- If this is a compilation unit, it must be made visible explicitly, |
1190 | -- because the compilation of the declaration, unlike other library | |
1191 | -- unit declarations, does not. If it is not a unit, the following | |
1192 | -- is redundant but harmless. | |
996ae0b0 RK |
1193 | |
1194 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1195 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1196 | |
ec4867fa ES |
1197 | if Is_Child_Unit (Gen_Id) then |
1198 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1199 | end if; | |
1200 | ||
996ae0b0 | 1201 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 | 1202 | |
ea3c0651 AC |
1203 | -- Deal with [refined] preconditions, postconditions, Contract_Cases, |
1204 | -- invariants and predicates associated with the body and its spec. | |
1205 | -- Note that this is not pure expansion as Expand_Subprogram_Contract | |
1206 | -- prepares the contract assertions for generic subprograms or for | |
1207 | -- ASIS. Do not generate contract checks in SPARK mode. | |
483361a6 | 1208 | |
f5da7a97 | 1209 | if not GNATprove_Mode then |
ea3c0651 | 1210 | Expand_Subprogram_Contract (N, Gen_Id, Body_Id); |
483361a6 | 1211 | end if; |
0dabde3a ES |
1212 | |
1213 | -- If the generic unit carries pre- or post-conditions, copy them | |
1214 | -- to the original generic tree, so that they are properly added | |
1215 | -- to any instantiation. | |
1216 | ||
1217 | declare | |
1218 | Orig : constant Node_Id := Original_Node (N); | |
1219 | Cond : Node_Id; | |
1220 | ||
1221 | begin | |
1222 | Cond := First (Declarations (N)); | |
1223 | while Present (Cond) loop | |
1224 | if Nkind (Cond) = N_Pragma | |
1225 | and then Pragma_Name (Cond) = Name_Check | |
1226 | then | |
1227 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1228 | ||
1229 | elsif Nkind (Cond) = N_Pragma | |
1230 | and then Pragma_Name (Cond) = Name_Postcondition | |
1231 | then | |
1232 | Set_Ekind (Defining_Entity (Orig), Ekind (Gen_Id)); | |
1233 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1234 | else | |
1235 | exit; | |
1236 | end if; | |
1237 | ||
1238 | Next (Cond); | |
1239 | end loop; | |
1240 | end; | |
1241 | ||
cbee4f74 AC |
1242 | Check_SPARK_Mode_In_Generic (N); |
1243 | ||
579847c2 AC |
1244 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
1245 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
1246 | ||
996ae0b0 RK |
1247 | Analyze_Declarations (Declarations (N)); |
1248 | Check_Completion; | |
1249 | Analyze (Handled_Statement_Sequence (N)); | |
1250 | ||
1251 | Save_Global_References (Original_Node (N)); | |
1252 | ||
82c80734 RD |
1253 | -- Prior to exiting the scope, include generic formals again (if any |
1254 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1255 | |
1256 | if Present (First_Ent) then | |
1257 | Set_First_Entity (Gen_Id, First_Ent); | |
1258 | end if; | |
1259 | ||
fbf5a39b | 1260 | Check_References (Gen_Id); |
996ae0b0 RK |
1261 | end; |
1262 | ||
e6f69614 | 1263 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1264 | End_Scope; |
1265 | Check_Subprogram_Order (N); | |
1266 | ||
e895b435 | 1267 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1268 | |
1269 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1270 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1271 | |
1272 | if Style_Check then | |
1273 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1274 | end if; | |
13d923cc | 1275 | |
996ae0b0 | 1276 | End_Generic; |
996ae0b0 RK |
1277 | end Analyze_Generic_Subprogram_Body; |
1278 | ||
4d8f3296 ES |
1279 | ---------------------------- |
1280 | -- Analyze_Null_Procedure -- | |
1281 | ---------------------------- | |
1282 | ||
1283 | procedure Analyze_Null_Procedure | |
1284 | (N : Node_Id; | |
1285 | Is_Completion : out Boolean) | |
1286 | is | |
1287 | Loc : constant Source_Ptr := Sloc (N); | |
1288 | Spec : constant Node_Id := Specification (N); | |
1289 | Designator : Entity_Id; | |
1290 | Form : Node_Id; | |
1291 | Null_Body : Node_Id := Empty; | |
1292 | Prev : Entity_Id; | |
1293 | ||
1294 | begin | |
1295 | -- Capture the profile of the null procedure before analysis, for | |
1296 | -- expansion at the freeze point and at each point of call. The body is | |
1297 | -- used if the procedure has preconditions, or if it is a completion. In | |
1298 | -- the first case the body is analyzed at the freeze point, in the other | |
1299 | -- it replaces the null procedure declaration. | |
1300 | ||
1301 | Null_Body := | |
1302 | Make_Subprogram_Body (Loc, | |
1303 | Specification => New_Copy_Tree (Spec), | |
8c35b40a | 1304 | Declarations => New_List, |
4d8f3296 ES |
1305 | Handled_Statement_Sequence => |
1306 | Make_Handled_Sequence_Of_Statements (Loc, | |
1307 | Statements => New_List (Make_Null_Statement (Loc)))); | |
1308 | ||
1309 | -- Create new entities for body and formals | |
1310 | ||
1311 | Set_Defining_Unit_Name (Specification (Null_Body), | |
1312 | Make_Defining_Identifier (Loc, Chars (Defining_Entity (N)))); | |
1313 | ||
1314 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1315 | while Present (Form) loop | |
1316 | Set_Defining_Identifier (Form, | |
1317 | Make_Defining_Identifier (Loc, Chars (Defining_Identifier (Form)))); | |
1318 | Next (Form); | |
1319 | end loop; | |
1320 | ||
1321 | -- Determine whether the null procedure may be a completion of a generic | |
1322 | -- suprogram, in which case we use the new null body as the completion | |
1323 | -- and set minimal semantic information on the original declaration, | |
1324 | -- which is rewritten as a null statement. | |
1325 | ||
1326 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
1327 | ||
1328 | if Present (Prev) and then Is_Generic_Subprogram (Prev) then | |
1329 | Insert_Before (N, Null_Body); | |
1330 | Set_Ekind (Defining_Entity (N), Ekind (Prev)); | |
1331 | Set_Contract (Defining_Entity (N), Make_Contract (Loc)); | |
1332 | ||
1333 | Rewrite (N, Make_Null_Statement (Loc)); | |
1334 | Analyze_Generic_Subprogram_Body (Null_Body, Prev); | |
1335 | Is_Completion := True; | |
1336 | return; | |
1337 | ||
1338 | else | |
4d8f3296 ES |
1339 | -- Resolve the types of the formals now, because the freeze point |
1340 | -- may appear in a different context, e.g. an instantiation. | |
1341 | ||
1342 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
1343 | while Present (Form) loop | |
1344 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
1345 | Find_Type (Parameter_Type (Form)); | |
1346 | ||
1347 | elsif | |
1348 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
1349 | then | |
1350 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
1351 | ||
1352 | else | |
1353 | -- The case of a null procedure with a formal that is an | |
1354 | -- access_to_subprogram type, and that is used as an actual | |
1355 | -- in an instantiation is left to the enthusiastic reader. | |
1356 | ||
1357 | null; | |
1358 | end if; | |
1359 | ||
1360 | Next (Form); | |
1361 | end loop; | |
1362 | end if; | |
1363 | ||
1364 | -- If there are previous overloadable entities with the same name, | |
1365 | -- check whether any of them is completed by the null procedure. | |
1366 | ||
1367 | if Present (Prev) and then Is_Overloadable (Prev) then | |
1368 | Designator := Analyze_Subprogram_Specification (Spec); | |
1369 | Prev := Find_Corresponding_Spec (N); | |
1370 | end if; | |
1371 | ||
1372 | if No (Prev) or else not Comes_From_Source (Prev) then | |
1373 | Designator := Analyze_Subprogram_Specification (Spec); | |
1374 | Set_Has_Completion (Designator); | |
1375 | ||
1376 | -- Signal to caller that this is a procedure declaration | |
1377 | ||
1378 | Is_Completion := False; | |
1379 | ||
1380 | -- Null procedures are always inlined, but generic formal subprograms | |
1381 | -- which appear as such in the internal instance of formal packages, | |
1382 | -- need no completion and are not marked Inline. | |
1383 | ||
1384 | if Expander_Active | |
1385 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
1386 | then | |
1387 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
1388 | Set_Body_To_Inline (N, Null_Body); | |
1389 | Set_Is_Inlined (Designator); | |
1390 | end if; | |
1391 | ||
1392 | else | |
1393 | -- The null procedure is a completion | |
1394 | ||
1395 | Is_Completion := True; | |
1396 | ||
1397 | if Expander_Active then | |
1398 | Rewrite (N, Null_Body); | |
1399 | Analyze (N); | |
1400 | ||
1401 | else | |
1402 | Designator := Analyze_Subprogram_Specification (Spec); | |
1403 | Set_Has_Completion (Designator); | |
1404 | Set_Has_Completion (Prev); | |
1405 | end if; | |
1406 | end if; | |
1407 | end Analyze_Null_Procedure; | |
1408 | ||
996ae0b0 RK |
1409 | ----------------------------- |
1410 | -- Analyze_Operator_Symbol -- | |
1411 | ----------------------------- | |
1412 | ||
82c80734 RD |
1413 | -- An operator symbol such as "+" or "and" may appear in context where the |
1414 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1415 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1416 | -- generates this node, and the semantics does the disambiguation. Other | |
1417 | -- such case are actuals in an instantiation, the generic unit in an | |
1418 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1419 | |
1420 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1421 | Par : constant Node_Id := Parent (N); | |
1422 | ||
1423 | begin | |
1f0b1e48 | 1424 | if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
996ae0b0 | 1425 | or else Nkind (Par) = N_Function_Instantiation |
1f0b1e48 | 1426 | or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
996ae0b0 | 1427 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1f0b1e48 | 1428 | and then not Is_Pragma_String_Literal (Par)) |
996ae0b0 | 1429 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
800621e0 RD |
1430 | or else (Nkind (Par) = N_Attribute_Reference |
1431 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1432 | then |
1433 | Find_Direct_Name (N); | |
1434 | ||
1435 | else | |
1436 | Change_Operator_Symbol_To_String_Literal (N); | |
1437 | Analyze (N); | |
1438 | end if; | |
1439 | end Analyze_Operator_Symbol; | |
1440 | ||
1441 | ----------------------------------- | |
1442 | -- Analyze_Parameter_Association -- | |
1443 | ----------------------------------- | |
1444 | ||
1445 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1446 | begin | |
1447 | Analyze (Explicit_Actual_Parameter (N)); | |
1448 | end Analyze_Parameter_Association; | |
1449 | ||
1450 | ---------------------------- | |
1451 | -- Analyze_Procedure_Call -- | |
1452 | ---------------------------- | |
1453 | ||
1454 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
1455 | Loc : constant Source_Ptr := Sloc (N); | |
1456 | P : constant Node_Id := Name (N); | |
1457 | Actuals : constant List_Id := Parameter_Associations (N); | |
1458 | Actual : Node_Id; | |
1459 | New_N : Node_Id; | |
1460 | ||
1461 | procedure Analyze_Call_And_Resolve; | |
1462 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1463 | -- At end, check illegal order dependence. |
996ae0b0 | 1464 | |
fbf5a39b AC |
1465 | ------------------------------ |
1466 | -- Analyze_Call_And_Resolve -- | |
1467 | ------------------------------ | |
1468 | ||
996ae0b0 RK |
1469 | procedure Analyze_Call_And_Resolve is |
1470 | begin | |
1471 | if Nkind (N) = N_Procedure_Call_Statement then | |
1472 | Analyze_Call (N); | |
1473 | Resolve (N, Standard_Void_Type); | |
1474 | else | |
1475 | Analyze (N); | |
1476 | end if; | |
1477 | end Analyze_Call_And_Resolve; | |
1478 | ||
1479 | -- Start of processing for Analyze_Procedure_Call | |
1480 | ||
1481 | begin | |
1482 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1483 | -- a procedure call or an entry call. The prefix may denote an access | |
1484 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1485 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1486 | -- then the construct denotes a call to a member of an entire family. |
1487 | -- If the prefix is a simple name, it may still denote a call to a | |
1488 | -- parameterless member of an entry family. Resolution of these various | |
1489 | -- interpretations is delicate. | |
1490 | ||
1491 | Analyze (P); | |
1492 | ||
758c442c GD |
1493 | -- If this is a call of the form Obj.Op, the call may have been |
1494 | -- analyzed and possibly rewritten into a block, in which case | |
1495 | -- we are done. | |
1496 | ||
1497 | if Analyzed (N) then | |
1498 | return; | |
1499 | end if; | |
1500 | ||
7415029d AC |
1501 | -- If there is an error analyzing the name (which may have been |
1502 | -- rewritten if the original call was in prefix notation) then error | |
1503 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1504 | |
21791d97 | 1505 | if Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
996ae0b0 RK |
1506 | Set_Etype (N, Any_Type); |
1507 | return; | |
1508 | end if; | |
1509 | ||
1510 | -- Otherwise analyze the parameters | |
1511 | ||
1512 | if Present (Actuals) then | |
1513 | Actual := First (Actuals); | |
1514 | ||
1515 | while Present (Actual) loop | |
1516 | Analyze (Actual); | |
1517 | Check_Parameterless_Call (Actual); | |
1518 | Next (Actual); | |
1519 | end loop; | |
1520 | end if; | |
1521 | ||
0bfc9a64 | 1522 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1523 | |
1524 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a AC |
1525 | and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
1526 | Name_Elab_Body, | |
1527 | Name_Elab_Subp_Body) | |
996ae0b0 RK |
1528 | then |
1529 | if Present (Actuals) then | |
1530 | Error_Msg_N | |
1531 | ("no parameters allowed for this call", First (Actuals)); | |
1532 | return; | |
1533 | end if; | |
1534 | ||
1535 | Set_Etype (N, Standard_Void_Type); | |
1536 | Set_Analyzed (N); | |
1537 | ||
1538 | elsif Is_Entity_Name (P) | |
1539 | and then Is_Record_Type (Etype (Entity (P))) | |
1540 | and then Remote_AST_I_Dereference (P) | |
1541 | then | |
1542 | return; | |
1543 | ||
1544 | elsif Is_Entity_Name (P) | |
1545 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1546 | then | |
1547 | if Is_Access_Type (Etype (P)) | |
1548 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1549 | and then No (Actuals) | |
1550 | and then Comes_From_Source (N) | |
1551 | then | |
ed2233dc | 1552 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1553 | end if; |
1554 | ||
1555 | Analyze_Call_And_Resolve; | |
1556 | ||
1557 | -- If the prefix is the simple name of an entry family, this is | |
1558 | -- a parameterless call from within the task body itself. | |
1559 | ||
1560 | elsif Is_Entity_Name (P) | |
1561 | and then Nkind (P) = N_Identifier | |
1562 | and then Ekind (Entity (P)) = E_Entry_Family | |
1563 | and then Present (Actuals) | |
1564 | and then No (Next (First (Actuals))) | |
1565 | then | |
82c80734 RD |
1566 | -- Can be call to parameterless entry family. What appears to be the |
1567 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1568 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1569 | -- transformation. |
1570 | ||
1571 | New_N := | |
1572 | Make_Indexed_Component (Loc, | |
1573 | Prefix => | |
1574 | Make_Selected_Component (Loc, | |
1575 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1576 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1577 | Expressions => Actuals); | |
1578 | Set_Name (N, New_N); | |
1579 | Set_Etype (New_N, Standard_Void_Type); | |
1580 | Set_Parameter_Associations (N, No_List); | |
1581 | Analyze_Call_And_Resolve; | |
1582 | ||
1583 | elsif Nkind (P) = N_Explicit_Dereference then | |
1584 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1585 | Analyze_Call_And_Resolve; | |
1586 | else | |
1587 | Error_Msg_N ("expect access to procedure in call", P); | |
1588 | end if; | |
1589 | ||
82c80734 RD |
1590 | -- The name can be a selected component or an indexed component that |
1591 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1592 | -- has parameter associations. | |
996ae0b0 RK |
1593 | |
1594 | elsif Is_Access_Type (Etype (P)) | |
1595 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1596 | then | |
1597 | if Present (Actuals) then | |
1598 | Analyze_Call_And_Resolve; | |
1599 | else | |
ed2233dc | 1600 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1601 | end if; |
1602 | ||
82c80734 RD |
1603 | -- If not an access to subprogram, then the prefix must resolve to the |
1604 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1605 | |
82c80734 RD |
1606 | -- For the case of a simple entry call, P is a selected component where |
1607 | -- the prefix is the task and the selector name is the entry. A call to | |
1608 | -- a protected procedure will have the same syntax. If the protected | |
1609 | -- object contains overloaded operations, the entity may appear as a | |
1610 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1611 | |
1612 | elsif Nkind (P) = N_Selected_Component | |
8fde064e AC |
1613 | and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
1614 | E_Procedure, | |
1615 | E_Function) | |
996ae0b0 RK |
1616 | then |
1617 | Analyze_Call_And_Resolve; | |
1618 | ||
1619 | elsif Nkind (P) = N_Selected_Component | |
1620 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1621 | and then Present (Actuals) | |
1622 | and then No (Next (First (Actuals))) | |
1623 | then | |
82c80734 RD |
1624 | -- Can be call to parameterless entry family. What appears to be the |
1625 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1626 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1627 | -- transformation. |
1628 | ||
1629 | New_N := | |
1630 | Make_Indexed_Component (Loc, | |
1631 | Prefix => New_Copy (P), | |
1632 | Expressions => Actuals); | |
1633 | Set_Name (N, New_N); | |
1634 | Set_Etype (New_N, Standard_Void_Type); | |
1635 | Set_Parameter_Associations (N, No_List); | |
1636 | Analyze_Call_And_Resolve; | |
1637 | ||
1638 | -- For the case of a reference to an element of an entry family, P is | |
1639 | -- an indexed component whose prefix is a selected component (task and | |
1640 | -- entry family), and whose index is the entry family index. | |
1641 | ||
1642 | elsif Nkind (P) = N_Indexed_Component | |
1643 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1644 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1645 | then | |
1646 | Analyze_Call_And_Resolve; | |
1647 | ||
1648 | -- If the prefix is the name of an entry family, it is a call from | |
1649 | -- within the task body itself. | |
1650 | ||
1651 | elsif Nkind (P) = N_Indexed_Component | |
1652 | and then Nkind (Prefix (P)) = N_Identifier | |
1653 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1654 | then | |
1655 | New_N := | |
1656 | Make_Selected_Component (Loc, | |
1657 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1658 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1659 | Rewrite (Prefix (P), New_N); | |
1660 | Analyze (P); | |
1661 | Analyze_Call_And_Resolve; | |
1662 | ||
9f8d1e5c AC |
1663 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
1664 | -- procedure name, so the construct can only be a qualified expression. | |
1665 | ||
1666 | elsif Nkind (P) = N_Qualified_Expression | |
1667 | and then Ada_Version >= Ada_2012 | |
1668 | then | |
1669 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
1670 | Analyze (N); | |
1671 | ||
e895b435 | 1672 | -- Anything else is an error |
996ae0b0 RK |
1673 | |
1674 | else | |
758c442c | 1675 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 RK |
1676 | end if; |
1677 | end Analyze_Procedure_Call; | |
1678 | ||
b0186f71 AC |
1679 | ------------------------------ |
1680 | -- Analyze_Return_Statement -- | |
1681 | ------------------------------ | |
1682 | ||
1683 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1684 | ||
1685 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1686 | N_Extended_Return_Statement)); | |
1687 | ||
1688 | Returns_Object : constant Boolean := | |
1689 | Nkind (N) = N_Extended_Return_Statement | |
1690 | or else | |
8fde064e AC |
1691 | (Nkind (N) = N_Simple_Return_Statement |
1692 | and then Present (Expression (N))); | |
b0186f71 AC |
1693 | -- True if we're returning something; that is, "return <expression>;" |
1694 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1695 | -- checking: If Returns_Object is True, N should apply to a function | |
1696 | -- body; otherwise N should apply to a procedure body, entry body, | |
1697 | -- accept statement, or extended return statement. | |
1698 | ||
1699 | function Find_What_It_Applies_To return Entity_Id; | |
1700 | -- Find the entity representing the innermost enclosing body, accept | |
1701 | -- statement, or extended return statement. If the result is a callable | |
1702 | -- construct or extended return statement, then this will be the value | |
1703 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1704 | -- illegal. See RM-6.5(4/2). | |
1705 | ||
1706 | ----------------------------- | |
1707 | -- Find_What_It_Applies_To -- | |
1708 | ----------------------------- | |
1709 | ||
1710 | function Find_What_It_Applies_To return Entity_Id is | |
1711 | Result : Entity_Id := Empty; | |
1712 | ||
1713 | begin | |
36b8f95f AC |
1714 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1715 | -- and postconditions. | |
b0186f71 AC |
1716 | |
1717 | for J in reverse 0 .. Scope_Stack.Last loop | |
1718 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1719 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1720 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1721 | end loop; |
1722 | ||
1723 | pragma Assert (Present (Result)); | |
1724 | return Result; | |
1725 | end Find_What_It_Applies_To; | |
1726 | ||
1727 | -- Local declarations | |
1728 | ||
1729 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1730 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1731 | Loc : constant Source_Ptr := Sloc (N); | |
1732 | Stm_Entity : constant Entity_Id := | |
1733 | New_Internal_Entity | |
1734 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1735 | ||
1736 | -- Start of processing for Analyze_Return_Statement | |
1737 | ||
1738 | begin | |
1739 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1740 | ||
1741 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1742 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1743 | ||
1744 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1745 | -- (4/2): an inner return statement will apply to this extended return. | |
1746 | ||
1747 | if Nkind (N) = N_Extended_Return_Statement then | |
1748 | Push_Scope (Stm_Entity); | |
1749 | end if; | |
1750 | ||
1751 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1752 | -- implicitly-generated return that is placed at the end. | |
1753 | ||
1754 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1755 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1756 | end if; | |
1757 | ||
1758 | -- Warn on any unassigned OUT parameters if in procedure | |
1759 | ||
1760 | if Ekind (Scope_Id) = E_Procedure then | |
1761 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1762 | end if; | |
1763 | ||
1764 | -- Check that functions return objects, and other things do not | |
1765 | ||
1766 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1767 | if not Returns_Object then | |
1768 | Error_Msg_N ("missing expression in return from function", N); | |
1769 | end if; | |
1770 | ||
1771 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1772 | if Returns_Object then | |
1773 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1774 | end if; | |
1775 | ||
1776 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1777 | if Returns_Object then | |
1778 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1779 | Error_Msg_N ("entry body cannot return value", N); | |
1780 | else | |
1781 | Error_Msg_N ("accept statement cannot return value", N); | |
1782 | end if; | |
1783 | end if; | |
1784 | ||
1785 | elsif Kind = E_Return_Statement then | |
1786 | ||
1787 | -- We are nested within another return statement, which must be an | |
1788 | -- extended_return_statement. | |
1789 | ||
1790 | if Returns_Object then | |
d0dcb2b1 AC |
1791 | if Nkind (N) = N_Extended_Return_Statement then |
1792 | Error_Msg_N | |
cc96a1b8 | 1793 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
1794 | N); |
1795 | ||
1796 | -- Case of a simple return statement with a value inside extended | |
1797 | -- return statement. | |
1798 | ||
1799 | else | |
1800 | Error_Msg_N | |
1801 | ("return nested in extended return statement cannot return " & | |
cc96a1b8 | 1802 | "value (use `RETURN;`)", N); |
d0dcb2b1 | 1803 | end if; |
b0186f71 AC |
1804 | end if; |
1805 | ||
1806 | else | |
1807 | Error_Msg_N ("illegal context for return statement", N); | |
1808 | end if; | |
1809 | ||
1810 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1811 | Analyze_Function_Return (N); | |
1812 | ||
1813 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1814 | Set_Return_Present (Scope_Id); | |
1815 | end if; | |
1816 | ||
1817 | if Nkind (N) = N_Extended_Return_Statement then | |
1818 | End_Scope; | |
1819 | end if; | |
1820 | ||
1821 | Kill_Current_Values (Last_Assignment_Only => True); | |
1822 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
1823 | |
1824 | Analyze_Dimension (N); | |
b0186f71 AC |
1825 | end Analyze_Return_Statement; |
1826 | ||
5d37ba92 ES |
1827 | ------------------------------------- |
1828 | -- Analyze_Simple_Return_Statement -- | |
1829 | ------------------------------------- | |
ec4867fa | 1830 | |
5d37ba92 | 1831 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1832 | begin |
5d37ba92 ES |
1833 | if Present (Expression (N)) then |
1834 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1835 | end if; |
1836 | ||
5d37ba92 ES |
1837 | Analyze_Return_Statement (N); |
1838 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1839 | |
82c80734 RD |
1840 | ------------------------- |
1841 | -- Analyze_Return_Type -- | |
1842 | ------------------------- | |
1843 | ||
1844 | procedure Analyze_Return_Type (N : Node_Id) is | |
1845 | Designator : constant Entity_Id := Defining_Entity (N); | |
1846 | Typ : Entity_Id := Empty; | |
1847 | ||
1848 | begin | |
ec4867fa ES |
1849 | -- Normal case where result definition does not indicate an error |
1850 | ||
41251c60 JM |
1851 | if Result_Definition (N) /= Error then |
1852 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
2ba431e5 | 1853 | Check_SPARK_Restriction |
fe5d3068 | 1854 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1855 | |
b1c11e0e JM |
1856 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1857 | ||
1858 | declare | |
1859 | AD : constant Node_Id := | |
1860 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1861 | begin | |
1862 | if Present (AD) and then Protected_Present (AD) then | |
1863 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1864 | else | |
1865 | Typ := Access_Definition (N, Result_Definition (N)); | |
1866 | end if; | |
1867 | end; | |
1868 | ||
41251c60 JM |
1869 | Set_Parent (Typ, Result_Definition (N)); |
1870 | Set_Is_Local_Anonymous_Access (Typ); | |
1871 | Set_Etype (Designator, Typ); | |
1872 | ||
b66c3ff4 AC |
1873 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1874 | ||
1875 | Null_Exclusion_Static_Checks (N); | |
1876 | ||
41251c60 JM |
1877 | -- Subtype_Mark case |
1878 | ||
1879 | else | |
1880 | Find_Type (Result_Definition (N)); | |
1881 | Typ := Entity (Result_Definition (N)); | |
1882 | Set_Etype (Designator, Typ); | |
1883 | ||
2ba431e5 | 1884 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1885 | |
8fde064e | 1886 | if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
2ba431e5 | 1887 | Check_SPARK_Restriction |
fe5d3068 | 1888 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1889 | Result_Definition (N)); |
daec8eeb YM |
1890 | end if; |
1891 | ||
b66c3ff4 AC |
1892 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1893 | ||
1894 | Null_Exclusion_Static_Checks (N); | |
1895 | ||
1896 | -- If a null exclusion is imposed on the result type, then create | |
1897 | -- a null-excluding itype (an access subtype) and use it as the | |
1898 | -- function's Etype. Note that the null exclusion checks are done | |
1899 | -- right before this, because they don't get applied to types that | |
1900 | -- do not come from source. | |
1901 | ||
8fde064e | 1902 | if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
b66c3ff4 AC |
1903 | Set_Etype (Designator, |
1904 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
1905 | (T => Typ, |
1906 | Related_Nod => N, | |
1907 | Scope_Id => Scope (Current_Scope))); | |
1908 | ||
1909 | -- The new subtype must be elaborated before use because | |
1910 | -- it is visible outside of the function. However its base | |
1911 | -- type may not be frozen yet, so the reference that will | |
1912 | -- force elaboration must be attached to the freezing of | |
1913 | -- the base type. | |
1914 | ||
212863c0 AC |
1915 | -- If the return specification appears on a proper body, |
1916 | -- the subtype will have been created already on the spec. | |
1917 | ||
ff7139c3 | 1918 | if Is_Frozen (Typ) then |
212863c0 AC |
1919 | if Nkind (Parent (N)) = N_Subprogram_Body |
1920 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
1921 | then | |
1922 | null; | |
1923 | else | |
1924 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
1925 | end if; | |
1926 | ||
ff7139c3 AC |
1927 | else |
1928 | Ensure_Freeze_Node (Typ); | |
1929 | ||
1930 | declare | |
212863c0 | 1931 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
1932 | begin |
1933 | Set_Itype (IR, Etype (Designator)); | |
1934 | Append_Freeze_Actions (Typ, New_List (IR)); | |
1935 | end; | |
1936 | end if; | |
1937 | ||
b66c3ff4 AC |
1938 | else |
1939 | Set_Etype (Designator, Typ); | |
1940 | end if; | |
1941 | ||
41251c60 | 1942 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
1943 | and then Is_Value_Type (Typ) |
1944 | then | |
1945 | null; | |
1946 | ||
1947 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 | 1948 | or else (Is_Class_Wide_Type (Typ) |
8fde064e | 1949 | and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
41251c60 | 1950 | then |
dd386db0 AC |
1951 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
1952 | -- parts. Untagged incomplete types are not allowed in bodies. | |
1953 | ||
1954 | if Ada_Version >= Ada_2012 then | |
1955 | if Is_Tagged_Type (Typ) then | |
1956 | null; | |
1957 | ||
5b6f12c7 | 1958 | elsif Nkind (Parent (N)) = N_Subprogram_Body |
31d922e3 AC |
1959 | or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
1960 | N_Entry_Body) | |
dd386db0 AC |
1961 | then |
1962 | Error_Msg_NE | |
1963 | ("invalid use of untagged incomplete type&", | |
1964 | Designator, Typ); | |
1965 | end if; | |
1966 | ||
63be2a5a | 1967 | -- The type must be completed in the current package. This |
31d922e3 | 1968 | -- is checked at the end of the package declaration when |
7b7a0c2b AC |
1969 | -- Taft-amendment types are identified. If the return type |
1970 | -- is class-wide, there is no required check, the type can | |
1971 | -- be a bona fide TAT. | |
63be2a5a AC |
1972 | |
1973 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 1974 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 1975 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
1976 | then |
1977 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
1978 | end if; | |
1979 | ||
dd386db0 AC |
1980 | else |
1981 | Error_Msg_NE | |
1982 | ("invalid use of incomplete type&", Designator, Typ); | |
1983 | end if; | |
41251c60 | 1984 | end if; |
82c80734 RD |
1985 | end if; |
1986 | ||
ec4867fa ES |
1987 | -- Case where result definition does indicate an error |
1988 | ||
82c80734 RD |
1989 | else |
1990 | Set_Etype (Designator, Any_Type); | |
1991 | end if; | |
1992 | end Analyze_Return_Type; | |
1993 | ||
996ae0b0 RK |
1994 | ----------------------------- |
1995 | -- Analyze_Subprogram_Body -- | |
1996 | ----------------------------- | |
1997 | ||
b1b543d2 BD |
1998 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
1999 | Loc : constant Source_Ptr := Sloc (N); | |
2000 | Body_Spec : constant Node_Id := Specification (N); | |
2001 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
2002 | ||
2003 | begin | |
2004 | if Debug_Flag_C then | |
2005 | Write_Str ("==> subprogram body "); | |
2006 | Write_Name (Chars (Body_Id)); | |
2007 | Write_Str (" from "); | |
2008 | Write_Location (Loc); | |
2009 | Write_Eol; | |
2010 | Indent; | |
2011 | end if; | |
2012 | ||
2013 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
2014 | ||
2015 | -- The real work is split out into the helper, so it can do "return;" | |
2016 | -- without skipping the debug output: | |
2017 | ||
2018 | Analyze_Subprogram_Body_Helper (N); | |
2019 | ||
2020 | if Debug_Flag_C then | |
2021 | Outdent; | |
2022 | Write_Str ("<== subprogram body "); | |
2023 | Write_Name (Chars (Body_Id)); | |
2024 | Write_Str (" from "); | |
2025 | Write_Location (Loc); | |
2026 | Write_Eol; | |
2027 | end if; | |
2028 | end Analyze_Subprogram_Body; | |
2029 | ||
ea3c0651 AC |
2030 | -------------------------------------- |
2031 | -- Analyze_Subprogram_Body_Contract -- | |
2032 | -------------------------------------- | |
2033 | ||
ab8843fa | 2034 | procedure Analyze_Subprogram_Body_Contract (Body_Id : Entity_Id) is |
2c8d828a | 2035 | Body_Decl : constant Node_Id := Parent (Parent (Body_Id)); |
c61ef416 | 2036 | Mode : SPARK_Mode_Type; |
54e28df2 HK |
2037 | Prag : Node_Id; |
2038 | Ref_Depends : Node_Id := Empty; | |
2039 | Ref_Global : Node_Id := Empty; | |
2c8d828a | 2040 | Spec_Id : Entity_Id; |
ea3c0651 | 2041 | |
ea3c0651 | 2042 | begin |
fc999c5d RD |
2043 | -- Due to the timing of contract analysis, delayed pragmas may be |
2044 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
2045 | -- context. To remedy this, restore the original SPARK_Mode of the | |
2046 | -- related subprogram body. | |
2047 | ||
c61ef416 AC |
2048 | Save_SPARK_Mode_And_Set (Body_Id, Mode); |
2049 | ||
77a40ec1 AC |
2050 | -- When a subprogram body declaration is illegal, its defining entity is |
2051 | -- left unanalyzed. There is nothing left to do in this case because the | |
dda38714 | 2052 | -- body lacks a contract, or even a proper Ekind. |
ab8843fa | 2053 | |
dda38714 | 2054 | if Ekind (Body_Id) = E_Void then |
ab8843fa HK |
2055 | return; |
2056 | end if; | |
2057 | ||
2c8d828a AC |
2058 | if Nkind (Body_Decl) = N_Subprogram_Body_Stub then |
2059 | Spec_Id := Corresponding_Spec_Of_Stub (Body_Decl); | |
2060 | else | |
2061 | Spec_Id := Corresponding_Spec (Body_Decl); | |
2062 | end if; | |
2063 | ||
54e28df2 HK |
2064 | -- Locate and store pragmas Refined_Depends and Refined_Global since |
2065 | -- their order of analysis matters. | |
2066 | ||
ab8843fa HK |
2067 | Prag := Classifications (Contract (Body_Id)); |
2068 | while Present (Prag) loop | |
2069 | if Pragma_Name (Prag) = Name_Refined_Depends then | |
54e28df2 | 2070 | Ref_Depends := Prag; |
ab8843fa | 2071 | elsif Pragma_Name (Prag) = Name_Refined_Global then |
54e28df2 | 2072 | Ref_Global := Prag; |
ab8843fa HK |
2073 | end if; |
2074 | ||
2075 | Prag := Next_Pragma (Prag); | |
2076 | end loop; | |
2077 | ||
54e28df2 HK |
2078 | -- Analyze Refined_Global first as Refined_Depends may mention items |
2079 | -- classified in the global refinement. | |
2080 | ||
2081 | if Present (Ref_Global) then | |
2082 | Analyze_Refined_Global_In_Decl_Part (Ref_Global); | |
2083 | ||
ab8843fa | 2084 | -- When the corresponding Global aspect/pragma references a state with |
2dade097 HK |
2085 | -- visible refinement, the body requires Refined_Global. Refinement is |
2086 | -- not required when SPARK checks are suppressed. | |
ab8843fa | 2087 | |
54e28df2 | 2088 | elsif Present (Spec_Id) then |
ab8843fa HK |
2089 | Prag := Get_Pragma (Spec_Id, Pragma_Global); |
2090 | ||
2dade097 HK |
2091 | if SPARK_Mode /= Off |
2092 | and then Present (Prag) | |
2093 | and then Contains_Refined_State (Prag) | |
2094 | then | |
ab8843fa HK |
2095 | Error_Msg_NE |
2096 | ("body of subprogram & requires global refinement", | |
2097 | Body_Decl, Spec_Id); | |
2098 | end if; | |
2099 | end if; | |
54e28df2 HK |
2100 | |
2101 | -- Refined_Depends must be analyzed after Refined_Global in order to see | |
2102 | -- the modes of all global refinements. | |
2103 | ||
2104 | if Present (Ref_Depends) then | |
2105 | Analyze_Refined_Depends_In_Decl_Part (Ref_Depends); | |
39d3009f AC |
2106 | |
2107 | -- When the corresponding Depends aspect/pragma references a state with | |
2dade097 HK |
2108 | -- visible refinement, the body requires Refined_Depends. Refinement is |
2109 | -- not required when SPARK checks are suppressed. | |
39d3009f AC |
2110 | |
2111 | elsif Present (Spec_Id) then | |
2112 | Prag := Get_Pragma (Spec_Id, Pragma_Depends); | |
2113 | ||
2dade097 HK |
2114 | if SPARK_Mode /= Off |
2115 | and then Present (Prag) | |
2116 | and then Contains_Refined_State (Prag) | |
2117 | then | |
39d3009f AC |
2118 | Error_Msg_NE |
2119 | ("body of subprogram & requires dependance refinement", | |
2120 | Body_Decl, Spec_Id); | |
2121 | end if; | |
54e28df2 | 2122 | end if; |
c61ef416 | 2123 | |
fc999c5d RD |
2124 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
2125 | -- pragmas have been analyzed. | |
2126 | ||
c61ef416 | 2127 | Restore_SPARK_Mode (Mode); |
ea3c0651 AC |
2128 | end Analyze_Subprogram_Body_Contract; |
2129 | ||
b1b543d2 BD |
2130 | ------------------------------------ |
2131 | -- Analyze_Subprogram_Body_Helper -- | |
2132 | ------------------------------------ | |
2133 | ||
996ae0b0 RK |
2134 | -- This procedure is called for regular subprogram bodies, generic bodies, |
2135 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
2136 | -- specification matters, and is used to create a proper declaration for | |
2137 | -- the subprogram, or to perform conformance checks. | |
2138 | ||
b1b543d2 | 2139 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b AC |
2140 | Loc : constant Source_Ptr := Sloc (N); |
2141 | Body_Spec : constant Node_Id := Specification (N); | |
2142 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
2143 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 2144 | Conformant : Boolean; |
21d27997 | 2145 | HSS : Node_Id; |
21d27997 RD |
2146 | Prot_Typ : Entity_Id := Empty; |
2147 | Spec_Id : Entity_Id; | |
2148 | Spec_Decl : Node_Id := Empty; | |
2149 | ||
2150 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
2151 | -- When we analyze a separate spec, the entity chain ends up containing | |
2152 | -- the formals, as well as any itypes generated during analysis of the | |
2153 | -- default expressions for parameters, or the arguments of associated | |
2154 | -- precondition/postcondition pragmas (which are analyzed in the context | |
2155 | -- of the spec since they have visibility on formals). | |
2156 | -- | |
2157 | -- These entities belong with the spec and not the body. However we do | |
2158 | -- the analysis of the body in the context of the spec (again to obtain | |
2159 | -- visibility to the formals), and all the entities generated during | |
2160 | -- this analysis end up also chained to the entity chain of the spec. | |
2161 | -- But they really belong to the body, and there is circuitry to move | |
2162 | -- them from the spec to the body. | |
2163 | -- | |
2164 | -- However, when we do this move, we don't want to move the real spec | |
2165 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
2166 | -- variable points to the last real spec entity, so we only move those | |
2167 | -- chained beyond that point. It is initialized to Empty to deal with | |
2168 | -- the case where there is no separate spec. | |
996ae0b0 | 2169 | |
c8a3028c AC |
2170 | procedure Analyze_Aspects_On_Body_Or_Stub; |
2171 | -- Analyze the aspect specifications of a subprogram body [stub]. It is | |
2172 | -- assumed that N has aspects. | |
2173 | ||
ec4867fa | 2174 | procedure Check_Anonymous_Return; |
e50e1c5e | 2175 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
2176 | -- or a type that contains tasks, we must create a master entity for |
2177 | -- the anonymous type, which typically will be used in an allocator | |
2178 | -- in the body of the function. | |
2179 | ||
e660dbf7 JM |
2180 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
2181 | -- Look ahead to recognize a pragma that may appear after the body. | |
2182 | -- If there is a previous spec, check that it appears in the same | |
2183 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
2184 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
2185 | -- If the body acts as a spec, and inlining is required, we create a | |
2186 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
2187 | -- If pragma does not appear after the body, check whether there is |
2188 | -- an inline pragma before any local declarations. | |
c37bb106 | 2189 | |
7665e4bd AC |
2190 | procedure Check_Missing_Return; |
2191 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
2192 | -- the warning checks implemented by Check_Returns. In formal mode, also |
2193 | -- verify that a function ends with a RETURN and that a procedure does | |
2194 | -- not contain any RETURN. | |
7665e4bd | 2195 | |
d44202ba HK |
2196 | function Disambiguate_Spec return Entity_Id; |
2197 | -- When a primitive is declared between the private view and the full | |
2198 | -- view of a concurrent type which implements an interface, a special | |
2199 | -- mechanism is used to find the corresponding spec of the primitive | |
2200 | -- body. | |
2201 | ||
5dcab3ca AC |
2202 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id); |
2203 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains | |
2204 | -- incomplete types coming from a limited context and swap their limited | |
2205 | -- views with the non-limited ones. | |
2206 | ||
d44202ba HK |
2207 | function Is_Private_Concurrent_Primitive |
2208 | (Subp_Id : Entity_Id) return Boolean; | |
2209 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
2210 | -- type that implements an interface and has a private view. | |
2211 | ||
76a69663 ES |
2212 | procedure Set_Trivial_Subprogram (N : Node_Id); |
2213 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
2214 | -- subprogram whose body is being analyzed. N is the statement node | |
2215 | -- causing the flag to be set, if the following statement is a return | |
2216 | -- of an entity, we mark the entity as set in source to suppress any | |
2217 | -- warning on the stylized use of function stubs with a dummy return. | |
2218 | ||
758c442c GD |
2219 | procedure Verify_Overriding_Indicator; |
2220 | -- If there was a previous spec, the entity has been entered in the | |
2221 | -- current scope previously. If the body itself carries an overriding | |
2222 | -- indicator, check that it is consistent with the known status of the | |
2223 | -- entity. | |
2224 | ||
c8a3028c AC |
2225 | ------------------------------------- |
2226 | -- Analyze_Aspects_On_Body_Or_Stub -- | |
2227 | ------------------------------------- | |
2228 | ||
2229 | procedure Analyze_Aspects_On_Body_Or_Stub is | |
2230 | procedure Diagnose_Misplaced_Aspects; | |
2231 | -- Subprogram body [stub] N has aspects, but they are not properly | |
2232 | -- placed. Provide precise diagnostics depending on the aspects | |
2233 | -- involved. | |
2234 | ||
2235 | -------------------------------- | |
2236 | -- Diagnose_Misplaced_Aspects -- | |
2237 | -------------------------------- | |
2238 | ||
2239 | procedure Diagnose_Misplaced_Aspects is | |
2240 | Asp : Node_Id; | |
2241 | Asp_Nam : Name_Id; | |
2242 | Asp_Id : Aspect_Id; | |
2243 | -- The current aspect along with its name and id | |
2244 | ||
2245 | procedure SPARK_Aspect_Error (Ref_Nam : Name_Id); | |
2246 | -- Emit an error message concerning SPARK aspect Asp. Ref_Nam is | |
2247 | -- the name of the refined version of the aspect. | |
2248 | ||
2249 | ------------------------ | |
2250 | -- SPARK_Aspect_Error -- | |
2251 | ------------------------ | |
2252 | ||
2253 | procedure SPARK_Aspect_Error (Ref_Nam : Name_Id) is | |
2254 | begin | |
2255 | -- The corresponding spec already contains the aspect in | |
2256 | -- question and the one appearing on the body must be the | |
2257 | -- refined form: | |
2258 | ||
2259 | -- procedure P with Global ...; | |
2260 | -- procedure P with Global ... is ... end P; | |
2261 | -- ^ | |
2262 | -- Refined_Global | |
2263 | ||
2264 | if Has_Aspect (Spec_Id, Asp_Id) then | |
2265 | Error_Msg_Name_1 := Asp_Nam; | |
2266 | ||
2267 | -- Subunits cannot carry aspects that apply to a subprogram | |
2268 | -- declaration. | |
2269 | ||
2270 | if Nkind (Parent (N)) = N_Subunit then | |
2271 | Error_Msg_N ("aspect % cannot apply to a subunit", Asp); | |
2272 | ||
2273 | else | |
2274 | Error_Msg_Name_2 := Ref_Nam; | |
2275 | Error_Msg_N ("aspect % should be %", Asp); | |
2276 | end if; | |
2277 | ||
2278 | -- Otherwise the aspect must appear in the spec, not in the | |
2279 | -- body: | |
2280 | ||
2281 | -- procedure P; | |
2282 | -- procedure P with Global ... is ... end P; | |
2283 | ||
2284 | else | |
2285 | Error_Msg_N | |
2286 | ("aspect specification must appear in subprogram " | |
2287 | & "declaration", Asp); | |
2288 | end if; | |
2289 | end SPARK_Aspect_Error; | |
2290 | ||
2291 | -- Start of processing for Diagnose_Misplaced_Aspects | |
2292 | ||
2293 | begin | |
2294 | -- Iterate over the aspect specifications and emit specific errors | |
2295 | -- where applicable. | |
2296 | ||
2297 | Asp := First (Aspect_Specifications (N)); | |
2298 | while Present (Asp) loop | |
2299 | Asp_Nam := Chars (Identifier (Asp)); | |
2300 | Asp_Id := Get_Aspect_Id (Asp_Nam); | |
2301 | ||
2302 | -- Do not emit errors on aspects that can appear on a | |
2303 | -- subprogram body. This scenario occurs when the aspect | |
2304 | -- specification list contains both misplaced and properly | |
2305 | -- placed aspects. | |
2306 | ||
2307 | if Aspect_On_Body_Or_Stub_OK (Asp_Id) then | |
2308 | null; | |
2309 | ||
2310 | -- Special diagnostics for SPARK aspects | |
2311 | ||
2312 | elsif Asp_Nam = Name_Depends then | |
2313 | SPARK_Aspect_Error (Name_Refined_Depends); | |
2314 | ||
2315 | elsif Asp_Nam = Name_Global then | |
2316 | SPARK_Aspect_Error (Name_Refined_Global); | |
2317 | ||
2318 | elsif Asp_Nam = Name_Post then | |
2319 | SPARK_Aspect_Error (Name_Refined_Post); | |
2320 | ||
2321 | else | |
2322 | Error_Msg_N | |
2323 | ("aspect specification must appear in subprogram " | |
2324 | & "declaration", Asp); | |
2325 | end if; | |
2326 | ||
2327 | Next (Asp); | |
2328 | end loop; | |
2329 | end Diagnose_Misplaced_Aspects; | |
2330 | ||
2331 | -- Start of processing for Analyze_Aspects_On_Body_Or_Stub | |
2332 | ||
2333 | begin | |
2334 | -- Language-defined aspects cannot be associated with a subprogram | |
2335 | -- body [stub] if the subprogram has a spec. Certain implementation | |
2336 | -- defined aspects are allowed to break this rule (for list, see | |
2337 | -- table Aspect_On_Body_Or_Stub_OK). | |
2338 | ||
2339 | if Present (Spec_Id) and then not Aspects_On_Body_Or_Stub_OK (N) then | |
2340 | Diagnose_Misplaced_Aspects; | |
2341 | else | |
2342 | Analyze_Aspect_Specifications (N, Body_Id); | |
2343 | end if; | |
2344 | end Analyze_Aspects_On_Body_Or_Stub; | |
2345 | ||
ec4867fa ES |
2346 | ---------------------------- |
2347 | -- Check_Anonymous_Return -- | |
2348 | ---------------------------- | |
2349 | ||
2350 | procedure Check_Anonymous_Return is | |
2351 | Decl : Node_Id; | |
a523b302 | 2352 | Par : Node_Id; |
ec4867fa ES |
2353 | Scop : Entity_Id; |
2354 | ||
2355 | begin | |
2356 | if Present (Spec_Id) then | |
2357 | Scop := Spec_Id; | |
2358 | else | |
2359 | Scop := Body_Id; | |
2360 | end if; | |
2361 | ||
2362 | if Ekind (Scop) = E_Function | |
2363 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 JM |
2364 | and then not Is_Thunk (Scop) |
2365 | and then (Has_Task (Designated_Type (Etype (Scop))) | |
2366 | or else | |
2367 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) | |
2368 | and then | |
2369 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 2370 | and then Expander_Active |
b20de9b9 | 2371 | |
8fde064e | 2372 | -- Avoid cases with no tasking support |
b20de9b9 AC |
2373 | |
2374 | and then RTE_Available (RE_Current_Master) | |
2375 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
2376 | then |
2377 | Decl := | |
2378 | Make_Object_Declaration (Loc, | |
2379 | Defining_Identifier => | |
2380 | Make_Defining_Identifier (Loc, Name_uMaster), | |
2381 | Constant_Present => True, | |
2382 | Object_Definition => | |
e4494292 | 2383 | New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
ec4867fa ES |
2384 | Expression => |
2385 | Make_Explicit_Dereference (Loc, | |
e4494292 | 2386 | New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
ec4867fa ES |
2387 | |
2388 | if Present (Declarations (N)) then | |
2389 | Prepend (Decl, Declarations (N)); | |
2390 | else | |
2391 | Set_Declarations (N, New_List (Decl)); | |
2392 | end if; | |
2393 | ||
2394 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
2395 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
2396 | |
2397 | -- Now mark the containing scope as a task master | |
2398 | ||
2399 | Par := N; | |
2400 | while Nkind (Par) /= N_Compilation_Unit loop | |
2401 | Par := Parent (Par); | |
2402 | pragma Assert (Present (Par)); | |
2403 | ||
2404 | -- If we fall off the top, we are at the outer level, and | |
2405 | -- the environment task is our effective master, so nothing | |
2406 | -- to mark. | |
2407 | ||
2408 | if Nkind_In | |
2409 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
2410 | then | |
2411 | Set_Is_Task_Master (Par, True); | |
2412 | exit; | |
2413 | end if; | |
2414 | end loop; | |
ec4867fa ES |
2415 | end if; |
2416 | end Check_Anonymous_Return; | |
2417 | ||
e660dbf7 JM |
2418 | ------------------------- |
2419 | -- Check_Inline_Pragma -- | |
2420 | ------------------------- | |
758c442c | 2421 | |
e660dbf7 JM |
2422 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
2423 | Prag : Node_Id; | |
2424 | Plist : List_Id; | |
0fb2ea01 | 2425 | |
21d27997 | 2426 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 2427 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 2428 | -- to this subprogram. |
21d27997 RD |
2429 | |
2430 | ----------------------- | |
2431 | -- Is_Inline_Pragma -- | |
2432 | ----------------------- | |
2433 | ||
2434 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
2435 | begin | |
2436 | return | |
2437 | Nkind (N) = N_Pragma | |
2438 | and then | |
8fde064e AC |
2439 | (Pragma_Name (N) = Name_Inline_Always |
2440 | or else | |
21d27997 RD |
2441 | (Front_End_Inlining |
2442 | and then Pragma_Name (N) = Name_Inline)) | |
2443 | and then | |
8fde064e AC |
2444 | Chars |
2445 | (Expression (First (Pragma_Argument_Associations (N)))) = | |
2446 | Chars (Body_Id); | |
21d27997 RD |
2447 | end Is_Inline_Pragma; |
2448 | ||
2449 | -- Start of processing for Check_Inline_Pragma | |
2450 | ||
c37bb106 | 2451 | begin |
e660dbf7 JM |
2452 | if not Expander_Active then |
2453 | return; | |
2454 | end if; | |
2455 | ||
2456 | if Is_List_Member (N) | |
2457 | and then Present (Next (N)) | |
21d27997 | 2458 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2459 | then |
2460 | Prag := Next (N); | |
2461 | ||
21d27997 RD |
2462 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2463 | and then Present (Declarations (N)) | |
2464 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2465 | then | |
2466 | Prag := First (Declarations (N)); | |
2467 | ||
e660dbf7 JM |
2468 | else |
2469 | Prag := Empty; | |
c37bb106 | 2470 | end if; |
e660dbf7 JM |
2471 | |
2472 | if Present (Prag) then | |
2473 | if Present (Spec_Id) then | |
30196a76 | 2474 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
2475 | Analyze (Prag); |
2476 | end if; | |
2477 | ||
2478 | else | |
d39d6bb8 | 2479 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
2480 | |
2481 | declare | |
2482 | Subp : constant Entity_Id := | |
30196a76 | 2483 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 2484 | Decl : constant Node_Id := |
30196a76 RD |
2485 | Make_Subprogram_Declaration (Loc, |
2486 | Specification => | |
2487 | New_Copy_Tree (Specification (N))); | |
2488 | ||
e660dbf7 JM |
2489 | begin |
2490 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
2491 | ||
2492 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 2493 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2494 | Set_Parameter_Specifications |
2495 | (Specification (Decl), Plist); | |
2496 | end if; | |
2497 | ||
2498 | Insert_Before (N, Decl); | |
2499 | Analyze (Decl); | |
2500 | Analyze (Prag); | |
2501 | Set_Has_Pragma_Inline (Subp); | |
2502 | ||
76a69663 | 2503 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2504 | Set_Is_Inlined (Subp); |
21d27997 | 2505 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2506 | end if; |
2507 | ||
158d55fa AC |
2508 | -- Prior to copying the subprogram body to create a template |
2509 | -- for it for subsequent inlining, remove the pragma from | |
2510 | -- the current body so that the copy that will produce the | |
2511 | -- new body will start from a completely unanalyzed tree. | |
2512 | ||
2513 | if Nkind (Parent (Prag)) = N_Subprogram_Body then | |
2514 | Rewrite (Prag, Make_Null_Statement (Sloc (Prag))); | |
2515 | end if; | |
2516 | ||
e660dbf7 JM |
2517 | Spec := Subp; |
2518 | end; | |
2519 | end if; | |
2520 | end if; | |
2521 | end Check_Inline_Pragma; | |
2522 | ||
7665e4bd AC |
2523 | -------------------------- |
2524 | -- Check_Missing_Return -- | |
2525 | -------------------------- | |
2526 | ||
2527 | procedure Check_Missing_Return is | |
2528 | Id : Entity_Id; | |
2529 | Missing_Ret : Boolean; | |
2530 | ||
2531 | begin | |
2532 | if Nkind (Body_Spec) = N_Function_Specification then | |
2533 | if Present (Spec_Id) then | |
2534 | Id := Spec_Id; | |
2535 | else | |
2536 | Id := Body_Id; | |
2537 | end if; | |
2538 | ||
fe5d3068 | 2539 | if Return_Present (Id) then |
7665e4bd AC |
2540 | Check_Returns (HSS, 'F', Missing_Ret); |
2541 | ||
2542 | if Missing_Ret then | |
2543 | Set_Has_Missing_Return (Id); | |
2544 | end if; | |
2545 | ||
2aca76d6 AC |
2546 | elsif Is_Generic_Subprogram (Id) |
2547 | or else not Is_Machine_Code_Subprogram (Id) | |
7665e4bd AC |
2548 | then |
2549 | Error_Msg_N ("missing RETURN statement in function body", N); | |
2550 | end if; | |
2551 | ||
fe5d3068 | 2552 | -- If procedure with No_Return, check returns |
607d0635 | 2553 | |
fe5d3068 YM |
2554 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
2555 | and then Present (Spec_Id) | |
2556 | and then No_Return (Spec_Id) | |
607d0635 | 2557 | then |
fe5d3068 YM |
2558 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
2559 | end if; | |
2560 | ||
ad05f2e9 | 2561 | -- Special checks in SPARK mode |
fe5d3068 YM |
2562 | |
2563 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 2564 | |
ad05f2e9 | 2565 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
2566 | |
2567 | declare | |
2568 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
2569 | begin | |
2570 | if Present (Stat) | |
7394c8cc AC |
2571 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
2572 | N_Extended_Return_Statement) | |
fe5d3068 | 2573 | then |
2ba431e5 | 2574 | Check_SPARK_Restriction |
fe5d3068 YM |
2575 | ("last statement in function should be RETURN", Stat); |
2576 | end if; | |
2577 | end; | |
2578 | ||
ad05f2e9 | 2579 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
2580 | |
2581 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
2582 | if Present (Spec_Id) then |
2583 | Id := Spec_Id; | |
2584 | else | |
2585 | Id := Body_Id; | |
2586 | end if; | |
2587 | ||
8d606a78 RD |
2588 | -- Would be nice to point to return statement here, can we |
2589 | -- borrow the Check_Returns procedure here ??? | |
2590 | ||
607d0635 | 2591 | if Return_Present (Id) then |
2ba431e5 | 2592 | Check_SPARK_Restriction |
fe5d3068 | 2593 | ("procedure should not have RETURN", N); |
607d0635 | 2594 | end if; |
7665e4bd AC |
2595 | end if; |
2596 | end Check_Missing_Return; | |
2597 | ||
d44202ba HK |
2598 | ----------------------- |
2599 | -- Disambiguate_Spec -- | |
2600 | ----------------------- | |
2601 | ||
2602 | function Disambiguate_Spec return Entity_Id is | |
2603 | Priv_Spec : Entity_Id; | |
2604 | Spec_N : Entity_Id; | |
2605 | ||
2606 | procedure Replace_Types (To_Corresponding : Boolean); | |
2607 | -- Depending on the flag, replace the type of formal parameters of | |
2608 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2609 | -- the corresponding record type or the other way around. | |
2610 | ||
2611 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2612 | Formal : Entity_Id; | |
2613 | Formal_Typ : Entity_Id; | |
2614 | ||
2615 | begin | |
2616 | Formal := First_Formal (Body_Id); | |
2617 | while Present (Formal) loop | |
2618 | Formal_Typ := Etype (Formal); | |
2619 | ||
df3e68b1 HK |
2620 | if Is_Class_Wide_Type (Formal_Typ) then |
2621 | Formal_Typ := Root_Type (Formal_Typ); | |
2622 | end if; | |
2623 | ||
d44202ba HK |
2624 | -- From concurrent type to corresponding record |
2625 | ||
2626 | if To_Corresponding then | |
2627 | if Is_Concurrent_Type (Formal_Typ) | |
2628 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
2629 | and then Present (Interfaces ( | |
2630 | Corresponding_Record_Type (Formal_Typ))) | |
2631 | then | |
2632 | Set_Etype (Formal, | |
2633 | Corresponding_Record_Type (Formal_Typ)); | |
2634 | end if; | |
2635 | ||
2636 | -- From corresponding record to concurrent type | |
2637 | ||
2638 | else | |
2639 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2640 | and then Present (Interfaces (Formal_Typ)) | |
2641 | then | |
2642 | Set_Etype (Formal, | |
2643 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2644 | end if; | |
2645 | end if; | |
2646 | ||
2647 | Next_Formal (Formal); | |
2648 | end loop; | |
2649 | end Replace_Types; | |
2650 | ||
2651 | -- Start of processing for Disambiguate_Spec | |
2652 | ||
2653 | begin | |
2654 | -- Try to retrieve the specification of the body as is. All error | |
2655 | -- messages are suppressed because the body may not have a spec in | |
2656 | -- its current state. | |
2657 | ||
2658 | Spec_N := Find_Corresponding_Spec (N, False); | |
2659 | ||
2660 | -- It is possible that this is the body of a primitive declared | |
2661 | -- between a private and a full view of a concurrent type. The | |
2662 | -- controlling parameter of the spec carries the concurrent type, | |
2663 | -- not the corresponding record type as transformed by Analyze_ | |
2664 | -- Subprogram_Specification. In such cases, we undo the change | |
2665 | -- made by the analysis of the specification and try to find the | |
2666 | -- spec again. | |
766d7add | 2667 | |
8198b93d HK |
2668 | -- Note that wrappers already have their corresponding specs and |
2669 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2670 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2671 | -- original concurrent status. |
d44202ba | 2672 | |
8198b93d HK |
2673 | if No (Spec_N) |
2674 | or else Is_Primitive_Wrapper (Spec_N) | |
2675 | then | |
d44202ba HK |
2676 | -- Restore all references of corresponding record types to the |
2677 | -- original concurrent types. | |
2678 | ||
2679 | Replace_Types (To_Corresponding => False); | |
2680 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2681 | ||
2682 | -- The current body truly belongs to a primitive declared between | |
2683 | -- a private and a full view. We leave the modified body as is, | |
2684 | -- and return the true spec. | |
2685 | ||
2686 | if Present (Priv_Spec) | |
2687 | and then Is_Private_Primitive (Priv_Spec) | |
2688 | then | |
2689 | return Priv_Spec; | |
2690 | end if; | |
2691 | ||
2692 | -- In case that this is some sort of error, restore the original | |
2693 | -- state of the body. | |
2694 | ||
2695 | Replace_Types (To_Corresponding => True); | |
2696 | end if; | |
2697 | ||
2698 | return Spec_N; | |
2699 | end Disambiguate_Spec; | |
2700 | ||
5dcab3ca AC |
2701 | ---------------------------- |
2702 | -- Exchange_Limited_Views -- | |
2703 | ---------------------------- | |
2704 | ||
2705 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id) is | |
2706 | procedure Detect_And_Exchange (Id : Entity_Id); | |
2707 | -- Determine whether Id's type denotes an incomplete type associated | |
2708 | -- with a limited with clause and exchange the limited view with the | |
2709 | -- non-limited one. | |
2710 | ||
2711 | ------------------------- | |
2712 | -- Detect_And_Exchange -- | |
2713 | ------------------------- | |
2714 | ||
2715 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
2716 | Typ : constant Entity_Id := Etype (Id); | |
2717 | ||
2718 | begin | |
2719 | if Ekind (Typ) = E_Incomplete_Type | |
7b56a91b | 2720 | and then From_Limited_With (Typ) |
5dcab3ca AC |
2721 | and then Present (Non_Limited_View (Typ)) |
2722 | then | |
2723 | Set_Etype (Id, Non_Limited_View (Typ)); | |
2724 | end if; | |
2725 | end Detect_And_Exchange; | |
2726 | ||
2727 | -- Local variables | |
2728 | ||
2729 | Formal : Entity_Id; | |
2730 | ||
2731 | -- Start of processing for Exchange_Limited_Views | |
2732 | ||
2733 | begin | |
2734 | if No (Subp_Id) then | |
2735 | return; | |
2736 | ||
2737 | -- Do not process subprogram bodies as they already use the non- | |
2738 | -- limited view of types. | |
2739 | ||
2740 | elsif not Ekind_In (Subp_Id, E_Function, E_Procedure) then | |
2741 | return; | |
2742 | end if; | |
2743 | ||
2744 | -- Examine all formals and swap views when applicable | |
2745 | ||
2746 | Formal := First_Formal (Subp_Id); | |
2747 | while Present (Formal) loop | |
2748 | Detect_And_Exchange (Formal); | |
2749 | ||
2750 | Next_Formal (Formal); | |
2751 | end loop; | |
2752 | ||
2753 | -- Process the return type of a function | |
2754 | ||
2755 | if Ekind (Subp_Id) = E_Function then | |
2756 | Detect_And_Exchange (Subp_Id); | |
2757 | end if; | |
2758 | end Exchange_Limited_Views; | |
2759 | ||
d44202ba HK |
2760 | ------------------------------------- |
2761 | -- Is_Private_Concurrent_Primitive -- | |
2762 | ------------------------------------- | |
2763 | ||
2764 | function Is_Private_Concurrent_Primitive | |
2765 | (Subp_Id : Entity_Id) return Boolean | |
2766 | is | |
2767 | Formal_Typ : Entity_Id; | |
2768 | ||
2769 | begin | |
2770 | if Present (First_Formal (Subp_Id)) then | |
2771 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2772 | ||
2773 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2774 | if Is_Class_Wide_Type (Formal_Typ) then |
2775 | Formal_Typ := Root_Type (Formal_Typ); | |
2776 | end if; | |
2777 | ||
d44202ba HK |
2778 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2779 | end if; | |
2780 | ||
2781 | -- The type of the first formal is a concurrent tagged type with | |
2782 | -- a private view. | |
2783 | ||
2784 | return | |
2785 | Is_Concurrent_Type (Formal_Typ) | |
2786 | and then Is_Tagged_Type (Formal_Typ) | |
2787 | and then Has_Private_Declaration (Formal_Typ); | |
2788 | end if; | |
2789 | ||
2790 | return False; | |
2791 | end Is_Private_Concurrent_Primitive; | |
2792 | ||
76a69663 ES |
2793 | ---------------------------- |
2794 | -- Set_Trivial_Subprogram -- | |
2795 | ---------------------------- | |
2796 | ||
2797 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2798 | Nxt : constant Node_Id := Next (N); | |
2799 | ||
2800 | begin | |
2801 | Set_Is_Trivial_Subprogram (Body_Id); | |
2802 | ||
2803 | if Present (Spec_Id) then | |
2804 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2805 | end if; | |
2806 | ||
2807 | if Present (Nxt) | |
2808 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2809 | and then No (Next (Nxt)) | |
2810 | and then Present (Expression (Nxt)) | |
2811 | and then Is_Entity_Name (Expression (Nxt)) | |
2812 | then | |
2813 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2814 | end if; | |
2815 | end Set_Trivial_Subprogram; | |
2816 | ||
758c442c GD |
2817 | --------------------------------- |
2818 | -- Verify_Overriding_Indicator -- | |
2819 | --------------------------------- | |
2820 | ||
2821 | procedure Verify_Overriding_Indicator is | |
2822 | begin | |
21d27997 RD |
2823 | if Must_Override (Body_Spec) then |
2824 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
2825 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2826 | then | |
2827 | null; | |
2828 | ||
038140ed | 2829 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2830 | Error_Msg_NE |
21d27997 | 2831 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
23e28b42 AC |
2832 | |
2833 | -- Overriding indicators aren't allowed for protected subprogram | |
2834 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
2835 | -- this to a warning if -gnatd.E is enabled. | |
2836 | ||
2837 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
2838 | Error_Msg_Warn := Error_To_Warning; | |
2839 | Error_Msg_N | |
b785e0b8 | 2840 | ("<<overriding indicator not allowed for protected " |
23e28b42 | 2841 | & "subprogram body", Body_Spec); |
21d27997 | 2842 | end if; |
758c442c | 2843 | |
5d37ba92 | 2844 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2845 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2846 | Error_Msg_NE |
5d37ba92 | 2847 | ("subprogram& overrides inherited operation", |
76a69663 | 2848 | Body_Spec, Spec_Id); |
5d37ba92 | 2849 | |
21d27997 RD |
2850 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
2851 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2852 | then | |
ed2233dc | 2853 | Error_Msg_NE |
21d27997 RD |
2854 | ("subprogram & overrides predefined operator ", |
2855 | Body_Spec, Spec_Id); | |
2856 | ||
23e28b42 AC |
2857 | -- Overriding indicators aren't allowed for protected subprogram |
2858 | -- bodies (see the Confirmation in Ada Comment AC95-00213). Change | |
2859 | -- this to a warning if -gnatd.E is enabled. | |
2860 | ||
2861 | elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then | |
2862 | Error_Msg_Warn := Error_To_Warning; | |
5d37ba92 | 2863 | |
23e28b42 | 2864 | Error_Msg_N |
b785e0b8 | 2865 | ("<<overriding indicator not allowed " & |
23e28b42 AC |
2866 | "for protected subprogram body", |
2867 | Body_Spec); | |
2868 | ||
2869 | -- If this is not a primitive operation, then the overriding | |
2870 | -- indicator is altogether illegal. | |
2871 | ||
2872 | elsif not Is_Primitive (Spec_Id) then | |
ed2233dc | 2873 | Error_Msg_N |
19d846a0 RD |
2874 | ("overriding indicator only allowed " & |
2875 | "if subprogram is primitive", | |
2876 | Body_Spec); | |
5d37ba92 | 2877 | end if; |
235f4375 | 2878 | |
23e28b42 AC |
2879 | -- If checking the style rule and the operation overrides, then |
2880 | -- issue a warning about a missing overriding_indicator. Protected | |
2881 | -- subprogram bodies are excluded from this style checking, since | |
2882 | -- they aren't primitives (even though their declarations can | |
2883 | -- override) and aren't allowed to have an overriding_indicator. | |
2884 | ||
806f6d37 | 2885 | elsif Style_Check |
038140ed | 2886 | and then Present (Overridden_Operation (Spec_Id)) |
23e28b42 | 2887 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type |
235f4375 AC |
2888 | then |
2889 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2890 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
2891 | |
2892 | elsif Style_Check | |
2893 | and then Can_Override_Operator (Spec_Id) | |
2894 | and then not Is_Predefined_File_Name | |
2895 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
2896 | then | |
2897 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2898 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
2899 | end if; |
2900 | end Verify_Overriding_Indicator; | |
2901 | ||
b1b543d2 | 2902 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 2903 | |
996ae0b0 | 2904 | begin |
82c80734 RD |
2905 | -- Generic subprograms are handled separately. They always have a |
2906 | -- generic specification. Determine whether current scope has a | |
2907 | -- previous declaration. | |
996ae0b0 | 2908 | |
82c80734 RD |
2909 | -- If the subprogram body is defined within an instance of the same |
2910 | -- name, the instance appears as a package renaming, and will be hidden | |
2911 | -- within the subprogram. | |
996ae0b0 RK |
2912 | |
2913 | if Present (Prev_Id) | |
2914 | and then not Is_Overloadable (Prev_Id) | |
2915 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
2916 | or else Comes_From_Source (Prev_Id)) | |
2917 | then | |
fbf5a39b | 2918 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 RK |
2919 | Spec_Id := Prev_Id; |
2920 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2921 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2922 | ||
2923 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
2924 | |
2925 | if Nkind (N) = N_Subprogram_Body then | |
2926 | HSS := Handled_Statement_Sequence (N); | |
2927 | Check_Missing_Return; | |
2928 | end if; | |
2929 | ||
996ae0b0 RK |
2930 | return; |
2931 | ||
2932 | else | |
82c80734 RD |
2933 | -- Previous entity conflicts with subprogram name. Attempting to |
2934 | -- enter name will post error. | |
996ae0b0 RK |
2935 | |
2936 | Enter_Name (Body_Id); | |
2937 | return; | |
2938 | end if; | |
2939 | ||
82c80734 RD |
2940 | -- Non-generic case, find the subprogram declaration, if one was seen, |
2941 | -- or enter new overloaded entity in the current scope. If the | |
2942 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
2943 | -- part of the context of one of its subunits. No need to redo the | |
2944 | -- analysis. | |
996ae0b0 | 2945 | |
8fde064e | 2946 | elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
996ae0b0 RK |
2947 | return; |
2948 | ||
2949 | else | |
fbf5a39b | 2950 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
2951 | |
2952 | if Nkind (N) = N_Subprogram_Body_Stub | |
2953 | or else No (Corresponding_Spec (N)) | |
2954 | then | |
d44202ba HK |
2955 | if Is_Private_Concurrent_Primitive (Body_Id) then |
2956 | Spec_Id := Disambiguate_Spec; | |
2957 | else | |
2958 | Spec_Id := Find_Corresponding_Spec (N); | |
2959 | end if; | |
996ae0b0 RK |
2960 | |
2961 | -- If this is a duplicate body, no point in analyzing it | |
2962 | ||
2963 | if Error_Posted (N) then | |
2964 | return; | |
2965 | end if; | |
2966 | ||
82c80734 RD |
2967 | -- A subprogram body should cause freezing of its own declaration, |
2968 | -- but if there was no previous explicit declaration, then the | |
2969 | -- subprogram will get frozen too late (there may be code within | |
2970 | -- the body that depends on the subprogram having been frozen, | |
2971 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 2972 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
2973 | -- Finally, if the return type is an anonymous access to protected |
2974 | -- subprogram, it must be frozen before the body because its | |
2975 | -- expansion has generated an equivalent type that is used when | |
2976 | -- elaborating the body. | |
996ae0b0 | 2977 | |
885c4871 | 2978 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
2979 | -- created for expression functions do not freeze. |
2980 | ||
2981 | if No (Spec_Id) | |
2982 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
2983 | then | |
996ae0b0 RK |
2984 | Freeze_Before (N, Body_Id); |
2985 | ||
2986 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
2987 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
2988 | |
2989 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
2990 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 2991 | end if; |
a38ff9b1 | 2992 | |
996ae0b0 RK |
2993 | else |
2994 | Spec_Id := Corresponding_Spec (N); | |
2995 | end if; | |
2996 | end if; | |
2997 | ||
799d0e05 AC |
2998 | -- Previously we scanned the body to look for nested subprograms, and |
2999 | -- rejected an inline directive if nested subprograms were present, | |
3000 | -- because the back-end would generate conflicting symbols for the | |
c8957aae | 3001 | -- nested bodies. This is now unnecessary. |
07fc65c4 | 3002 | |
c8957aae | 3003 | -- Look ahead to recognize a pragma Inline that appears after the body |
84f4072a | 3004 | |
e660dbf7 JM |
3005 | Check_Inline_Pragma (Spec_Id); |
3006 | ||
701b7fbb RD |
3007 | -- Deal with special case of a fully private operation in the body of |
3008 | -- the protected type. We must create a declaration for the subprogram, | |
3009 | -- in order to attach the protected subprogram that will be used in | |
3010 | -- internal calls. We exclude compiler generated bodies from the | |
3011 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 3012 | |
996ae0b0 RK |
3013 | if No (Spec_Id) |
3014 | and then Comes_From_Source (N) | |
3015 | and then Is_Protected_Type (Current_Scope) | |
3016 | then | |
47bfea3a | 3017 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 3018 | end if; |
996ae0b0 | 3019 | |
5334d18f | 3020 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 3021 | |
701b7fbb | 3022 | if Present (Spec_Id) then |
996ae0b0 | 3023 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 3024 | Verify_Overriding_Indicator; |
5d37ba92 ES |
3025 | |
3026 | -- In general, the spec will be frozen when we start analyzing the | |
3027 | -- body. However, for internally generated operations, such as | |
3028 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
3029 | -- results, the spec may not have been frozen by the time we expand |
3030 | -- the freeze actions that include the bodies. In particular, extra | |
3031 | -- formals for accessibility or for return-in-place may need to be | |
3032 | -- generated. Freeze nodes, if any, are inserted before the current | |
3033 | -- body. These freeze actions are also needed in ASIS mode to enable | |
3034 | -- the proper back-annotations. | |
5d37ba92 ES |
3035 | |
3036 | if not Is_Frozen (Spec_Id) | |
7134062a | 3037 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
3038 | then |
3039 | -- Force the generation of its freezing node to ensure proper | |
3040 | -- management of access types in the backend. | |
3041 | ||
3042 | -- This is definitely needed for some cases, but it is not clear | |
3043 | -- why, to be investigated further??? | |
3044 | ||
3045 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 3046 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 3047 | end if; |
996ae0b0 RK |
3048 | end if; |
3049 | ||
a5d83d61 AC |
3050 | -- Mark presence of postcondition procedure in current scope and mark |
3051 | -- the procedure itself as needing debug info. The latter is important | |
3052 | -- when analyzing decision coverage (for example, for MC/DC coverage). | |
7ca78bba | 3053 | |
0dabde3a ES |
3054 | if Chars (Body_Id) = Name_uPostconditions then |
3055 | Set_Has_Postconditions (Current_Scope); | |
a5d83d61 | 3056 | Set_Debug_Info_Needed (Body_Id); |
0dabde3a ES |
3057 | end if; |
3058 | ||
996ae0b0 RK |
3059 | -- Place subprogram on scope stack, and make formals visible. If there |
3060 | -- is a spec, the visible entity remains that of the spec. | |
3061 | ||
3062 | if Present (Spec_Id) then | |
07fc65c4 | 3063 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
3064 | |
3065 | if Is_Child_Unit (Spec_Id) then | |
3066 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
3067 | end if; | |
3068 | ||
fbf5a39b AC |
3069 | if Style_Check then |
3070 | Style.Check_Identifier (Body_Id, Spec_Id); | |
3071 | end if; | |
996ae0b0 RK |
3072 | |
3073 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
3074 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
3075 | ||
f937473f | 3076 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 3077 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
996ae0b0 | 3078 | return; |
21d27997 | 3079 | |
996ae0b0 RK |
3080 | else |
3081 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
3082 | Set_Has_Completion (Spec_Id); | |
3083 | ||
3084 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 3085 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
3086 | end if; |
3087 | ||
3088 | -- If this is a body generated for a renaming, do not check for | |
3089 | -- full conformance. The check is redundant, because the spec of | |
3090 | -- the body is a copy of the spec in the renaming declaration, | |
3091 | -- and the test can lead to spurious errors on nested defaults. | |
3092 | ||
3093 | if Present (Spec_Decl) | |
996ae0b0 | 3094 | and then not Comes_From_Source (N) |
93a81b02 GB |
3095 | and then |
3096 | (Nkind (Original_Node (Spec_Decl)) = | |
d2f97d3e | 3097 | N_Subprogram_Renaming_Declaration |
466c2127 AC |
3098 | or else (Present (Corresponding_Body (Spec_Decl)) |
3099 | and then | |
3100 | Nkind (Unit_Declaration_Node | |
3101 | (Corresponding_Body (Spec_Decl))) = | |
3102 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
3103 | then |
3104 | Conformant := True; | |
cabe9abc AC |
3105 | |
3106 | -- Conversely, the spec may have been generated for specless body | |
3107 | -- with an inline pragma. | |
3108 | ||
3109 | elsif Comes_From_Source (N) | |
3110 | and then not Comes_From_Source (Spec_Id) | |
3111 | and then Has_Pragma_Inline (Spec_Id) | |
3112 | then | |
3113 | Conformant := True; | |
76a69663 | 3114 | |
996ae0b0 RK |
3115 | else |
3116 | Check_Conformance | |
3117 | (Body_Id, Spec_Id, | |
76a69663 | 3118 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
3119 | end if; |
3120 | ||
3121 | -- If the body is not fully conformant, we have to decide if we | |
3122 | -- should analyze it or not. If it has a really messed up profile | |
3123 | -- then we probably should not analyze it, since we will get too | |
3124 | -- many bogus messages. | |
3125 | ||
3126 | -- Our decision is to go ahead in the non-fully conformant case | |
3127 | -- only if it is at least mode conformant with the spec. Note | |
3128 | -- that the call to Check_Fully_Conformant has issued the proper | |
3129 | -- error messages to complain about the lack of conformance. | |
3130 | ||
3131 | if not Conformant | |
3132 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
3133 | then | |
3134 | return; | |
3135 | end if; | |
3136 | end if; | |
3137 | ||
996ae0b0 | 3138 | if Spec_Id /= Body_Id then |
fbf5a39b | 3139 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
3140 | end if; |
3141 | ||
579847c2 AC |
3142 | Set_Ekind (Body_Id, E_Subprogram_Body); |
3143 | ||
e28072cd AC |
3144 | if Nkind (N) = N_Subprogram_Body_Stub then |
3145 | Set_Corresponding_Spec_Of_Stub (N, Spec_Id); | |
3146 | ||
3147 | -- Regular body | |
3148 | ||
3149 | else | |
996ae0b0 | 3150 | Set_Corresponding_Spec (N, Spec_Id); |
758c442c | 3151 | |
5d37ba92 ES |
3152 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
3153 | -- of a concurrent type, the type of the first parameter has been | |
3154 | -- replaced with the corresponding record, which is the proper | |
3155 | -- run-time structure to use. However, within the body there may | |
3156 | -- be uses of the formals that depend on primitive operations | |
3157 | -- of the type (in particular calls in prefixed form) for which | |
3158 | -- we need the original concurrent type. The operation may have | |
3159 | -- several controlling formals, so the replacement must be done | |
3160 | -- for all of them. | |
758c442c GD |
3161 | |
3162 | if Comes_From_Source (Spec_Id) | |
3163 | and then Present (First_Entity (Spec_Id)) | |
3164 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
3165 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
15918371 AC |
3166 | and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
3167 | and then Present (Corresponding_Concurrent_Type | |
3168 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 3169 | then |
5d37ba92 ES |
3170 | declare |
3171 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
3172 | Form : Entity_Id; | |
3173 | ||
3174 | begin | |
3175 | Form := First_Formal (Spec_Id); | |
3176 | while Present (Form) loop | |
3177 | if Etype (Form) = Typ then | |
3178 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
3179 | end if; | |
3180 | ||
3181 | Next_Formal (Form); | |
3182 | end loop; | |
3183 | end; | |
758c442c GD |
3184 | end if; |
3185 | ||
21d27997 RD |
3186 | -- Make the formals visible, and place subprogram on scope stack. |
3187 | -- This is also the point at which we set Last_Real_Spec_Entity | |
3188 | -- to mark the entities which will not be moved to the body. | |
758c442c | 3189 | |
996ae0b0 | 3190 | Install_Formals (Spec_Id); |
21d27997 | 3191 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
616547fa AC |
3192 | |
3193 | -- Within an instance, add local renaming declarations so that | |
a5a809b2 AC |
3194 | -- gdb can retrieve the values of actuals more easily. This is |
3195 | -- only relevant if generating code (and indeed we definitely | |
3196 | -- do not want these definitions -gnatc mode, because that would | |
3197 | -- confuse ASIS). | |
616547fa AC |
3198 | |
3199 | if Is_Generic_Instance (Spec_Id) | |
3200 | and then Is_Wrapper_Package (Current_Scope) | |
a5a809b2 | 3201 | and then Expander_Active |
616547fa AC |
3202 | then |
3203 | Build_Subprogram_Instance_Renamings (N, Current_Scope); | |
3204 | end if; | |
3205 | ||
0a36105d | 3206 | Push_Scope (Spec_Id); |
996ae0b0 RK |
3207 | |
3208 | -- Make sure that the subprogram is immediately visible. For | |
3209 | -- child units that have no separate spec this is indispensable. | |
3210 | -- Otherwise it is safe albeit redundant. | |
3211 | ||
3212 | Set_Is_Immediately_Visible (Spec_Id); | |
3213 | end if; | |
3214 | ||
3215 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
ea3c0651 | 3216 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
996ae0b0 | 3217 | Set_Scope (Body_Id, Scope (Spec_Id)); |
ec4867fa | 3218 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
996ae0b0 RK |
3219 | |
3220 | -- Case of subprogram body with no previous spec | |
3221 | ||
3222 | else | |
3e5daac4 AC |
3223 | -- Check for style warning required |
3224 | ||
996ae0b0 | 3225 | if Style_Check |
3e5daac4 AC |
3226 | |
3227 | -- Only apply check for source level subprograms for which checks | |
3228 | -- have not been suppressed. | |
3229 | ||
996ae0b0 RK |
3230 | and then Comes_From_Source (Body_Id) |
3231 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
3232 | |
3233 | -- No warnings within an instance | |
3234 | ||
996ae0b0 | 3235 | and then not In_Instance |
3e5daac4 | 3236 | |
b0186f71 | 3237 | -- No warnings for expression functions |
3e5daac4 | 3238 | |
b0186f71 | 3239 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
3240 | then |
3241 | Style.Body_With_No_Spec (N); | |
3242 | end if; | |
3243 | ||
3244 | New_Overloaded_Entity (Body_Id); | |
3245 | ||
3246 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
3247 | Set_Acts_As_Spec (N); | |
3248 | Generate_Definition (Body_Id); | |
dac3bede | 3249 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
fbf5a39b AC |
3250 | Generate_Reference |
3251 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 3252 | Install_Formals (Body_Id); |
e949ee22 | 3253 | |
4a854847 | 3254 | Push_Scope (Body_Id); |
996ae0b0 | 3255 | end if; |
dbe36d67 AC |
3256 | |
3257 | -- For stubs and bodies with no previous spec, generate references to | |
3258 | -- formals. | |
3259 | ||
3260 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
3261 | end if; |
3262 | ||
5216b599 AC |
3263 | -- Set SPARK_Mode from context |
3264 | ||
3265 | Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); | |
3266 | Set_SPARK_Pragma_Inherited (Body_Id, True); | |
3267 | ||
76a69663 ES |
3268 | -- If the return type is an anonymous access type whose designated type |
3269 | -- is the limited view of a class-wide type and the non-limited view is | |
3270 | -- available, update the return type accordingly. | |
ec4867fa | 3271 | |
8fde064e | 3272 | if Ada_Version >= Ada_2005 and then Comes_From_Source (N) then |
ec4867fa | 3273 | declare |
ec4867fa | 3274 | Etyp : Entity_Id; |
0a36105d | 3275 | Rtyp : Entity_Id; |
ec4867fa ES |
3276 | |
3277 | begin | |
0a36105d JM |
3278 | Rtyp := Etype (Current_Scope); |
3279 | ||
3280 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
3281 | Etyp := Directly_Designated_Type (Rtyp); | |
3282 | ||
7b56a91b AC |
3283 | if Is_Class_Wide_Type (Etyp) |
3284 | and then From_Limited_With (Etyp) | |
3285 | then | |
0a36105d JM |
3286 | Set_Directly_Designated_Type |
3287 | (Etype (Current_Scope), Available_View (Etyp)); | |
3288 | end if; | |
3289 | end if; | |
ec4867fa ES |
3290 | end; |
3291 | end if; | |
3292 | ||
996ae0b0 RK |
3293 | -- If this is the proper body of a stub, we must verify that the stub |
3294 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 3295 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
3296 | -- only required for subprograms that come from source. |
3297 | ||
3298 | if Nkind (Parent (N)) = N_Subunit | |
3299 | and then Comes_From_Source (N) | |
3300 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
3301 | and then Nkind (Corresponding_Stub (Parent (N))) = |
3302 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
3303 | then |
3304 | declare | |
fbf5a39b AC |
3305 | Old_Id : constant Entity_Id := |
3306 | Defining_Entity | |
3307 | (Specification (Corresponding_Stub (Parent (N)))); | |
3308 | ||
996ae0b0 | 3309 | Conformant : Boolean := False; |
996ae0b0 RK |
3310 | |
3311 | begin | |
3312 | if No (Spec_Id) then | |
3313 | Check_Fully_Conformant (Body_Id, Old_Id); | |
3314 | ||
3315 | else | |
3316 | Check_Conformance | |
3317 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
3318 | ||
3319 | if not Conformant then | |
3320 | ||
dbe36d67 AC |
3321 | -- The stub was taken to be a new declaration. Indicate that |
3322 | -- it lacks a body. | |
996ae0b0 RK |
3323 | |
3324 | Set_Has_Completion (Old_Id, False); | |
3325 | end if; | |
3326 | end if; | |
3327 | end; | |
3328 | end if; | |
3329 | ||
3330 | Set_Has_Completion (Body_Id); | |
3331 | Check_Eliminated (Body_Id); | |
3332 | ||
3333 | if Nkind (N) = N_Subprogram_Body_Stub then | |
c8a3028c AC |
3334 | |
3335 | -- Analyze any aspect specifications that appear on the subprogram | |
3336 | -- body stub. | |
3337 | ||
3338 | if Has_Aspects (N) then | |
3339 | Analyze_Aspects_On_Body_Or_Stub; | |
3340 | end if; | |
3341 | ||
3342 | -- Stop the analysis now as the stub cannot be inlined, plus it does | |
3343 | -- not have declarative or statement lists. | |
3344 | ||
996ae0b0 | 3345 | return; |
84f4072a | 3346 | end if; |
996ae0b0 | 3347 | |
84f4072a JM |
3348 | -- Handle frontend inlining. There is no need to prepare us for inlining |
3349 | -- if we will not generate the code. | |
3350 | ||
3351 | -- Old semantics | |
3352 | ||
3353 | if not Debug_Flag_Dot_K then | |
3354 | if Present (Spec_Id) | |
3355 | and then Expander_Active | |
3356 | and then | |
3357 | (Has_Pragma_Inline_Always (Spec_Id) | |
8fde064e | 3358 | or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining)) |
84f4072a JM |
3359 | then |
3360 | Build_Body_To_Inline (N, Spec_Id); | |
3361 | end if; | |
3362 | ||
3363 | -- New semantics | |
3364 | ||
3365 | elsif Expander_Active | |
3366 | and then Serious_Errors_Detected = 0 | |
3367 | and then Present (Spec_Id) | |
3368 | and then Has_Pragma_Inline (Spec_Id) | |
996ae0b0 | 3369 | then |
84f4072a | 3370 | Check_And_Build_Body_To_Inline (N, Spec_Id, Body_Id); |
996ae0b0 RK |
3371 | end if; |
3372 | ||
0ab80019 | 3373 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 3374 | -- of the specification we have to install the private withed units. |
21d27997 | 3375 | -- This holds for child units as well. |
9bc856dd AC |
3376 | |
3377 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 3378 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
3379 | then |
3380 | Install_Private_With_Clauses (Body_Id); | |
3381 | end if; | |
3382 | ||
ec4867fa ES |
3383 | Check_Anonymous_Return; |
3384 | ||
fdce4bb7 JM |
3385 | -- Set the Protected_Formal field of each extra formal of the protected |
3386 | -- subprogram to reference the corresponding extra formal of the | |
3387 | -- subprogram that implements it. For regular formals this occurs when | |
3388 | -- the protected subprogram's declaration is expanded, but the extra | |
3389 | -- formals don't get created until the subprogram is frozen. We need to | |
3390 | -- do this before analyzing the protected subprogram's body so that any | |
3391 | -- references to the original subprogram's extra formals will be changed | |
3392 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
3393 | ||
3394 | if Present (Spec_Id) | |
3395 | and then Is_Protected_Type (Scope (Spec_Id)) | |
3396 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
3397 | then | |
3398 | declare | |
3399 | Impl_Subp : constant Entity_Id := | |
3400 | Protected_Body_Subprogram (Spec_Id); | |
3401 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
3402 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
3403 | begin |
3404 | while Present (Prot_Ext_Formal) loop | |
3405 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 3406 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
3407 | Next_Formal_With_Extras (Prot_Ext_Formal); |
3408 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
3409 | end loop; | |
3410 | end; | |
3411 | end if; | |
3412 | ||
0868e09c | 3413 | -- Now we can go on to analyze the body |
996ae0b0 RK |
3414 | |
3415 | HSS := Handled_Statement_Sequence (N); | |
3416 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 3417 | |
f3d0f304 | 3418 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
3419 | -- for discriminals and privals and finally a declaration for the entry |
3420 | -- family index (if applicable). This form of early expansion is done | |
3421 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 | 3422 | -- references entities which were created during regular expansion. The |
3b8056a5 AC |
3423 | -- subprogram entity must come from source, and not be an internally |
3424 | -- generated subprogram. | |
21d27997 | 3425 | |
4460a9bc | 3426 | if Expander_Active |
21d27997 RD |
3427 | and then Present (Prot_Typ) |
3428 | and then Present (Spec_Id) | |
3b8056a5 | 3429 | and then Comes_From_Source (Spec_Id) |
21d27997 RD |
3430 | and then not Is_Eliminated (Spec_Id) |
3431 | then | |
3432 | Install_Private_Data_Declarations | |
3433 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
3434 | end if; | |
3435 | ||
5dcab3ca AC |
3436 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
3437 | -- may now appear in parameter and result profiles. Since the analysis | |
3438 | -- of a subprogram body may use the parameter and result profile of the | |
3439 | -- spec, swap any limited views with their non-limited counterpart. | |
3440 | ||
3441 | if Ada_Version >= Ada_2012 then | |
3442 | Exchange_Limited_Views (Spec_Id); | |
3443 | end if; | |
3444 | ||
c8a3028c AC |
3445 | -- Analyze any aspect specifications that appear on the subprogram body |
3446 | ||
3447 | if Has_Aspects (N) then | |
3448 | Analyze_Aspects_On_Body_Or_Stub; | |
3449 | end if; | |
3450 | ||
3451 | -- Deal with [refined] preconditions, postconditions, Contract_Cases, | |
3452 | -- invariants and predicates associated with the body and its spec. | |
3453 | -- Note that this is not pure expansion as Expand_Subprogram_Contract | |
3454 | -- prepares the contract assertions for generic subprograms or for ASIS. | |
3455 | -- Do not generate contract checks in SPARK mode. | |
3456 | ||
3457 | if not GNATprove_Mode then | |
3458 | Expand_Subprogram_Contract (N, Spec_Id, Body_Id); | |
3459 | end if; | |
3460 | ||
21d27997 RD |
3461 | -- Analyze the declarations (this call will analyze the precondition |
3462 | -- Check pragmas we prepended to the list, as well as the declaration | |
3463 | -- of the _Postconditions procedure). | |
3464 | ||
996ae0b0 | 3465 | Analyze_Declarations (Declarations (N)); |
21d27997 | 3466 | |
f90d14ac AC |
3467 | -- After declarations have been analyzed, the body has been set |
3468 | -- its final value of SPARK_Mode. Check that SPARK_Mode for body | |
3469 | -- is consistent with SPARK_Mode for spec. | |
3470 | ||
3471 | if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then | |
3472 | if Present (SPARK_Pragma (Spec_Id)) then | |
3473 | if Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Spec_Id)) = Off | |
3474 | and then | |
3475 | Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Body_Id)) = On | |
3476 | then | |
3477 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3478 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3479 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); | |
3480 | Error_Msg_NE | |
cf3e6845 | 3481 | ("\value Off was set for SPARK_Mode on&#", N, Spec_Id); |
f90d14ac AC |
3482 | end if; |
3483 | ||
3484 | elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then | |
3485 | null; | |
3486 | ||
3487 | else | |
3488 | Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); | |
3489 | Error_Msg_N ("incorrect application of SPARK_Mode#", N); | |
3490 | Error_Msg_Sloc := Sloc (Spec_Id); | |
cf3e6845 | 3491 | Error_Msg_NE ("\no value was set for SPARK_Mode on&#", N, Spec_Id); |
f90d14ac AC |
3492 | end if; |
3493 | end if; | |
3494 | ||
21d27997 RD |
3495 | -- Check completion, and analyze the statements |
3496 | ||
996ae0b0 | 3497 | Check_Completion; |
33931112 | 3498 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 3499 | Analyze (HSS); |
21d27997 RD |
3500 | |
3501 | -- Deal with end of scope processing for the body | |
3502 | ||
07fc65c4 | 3503 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
3504 | End_Scope; |
3505 | Check_Subprogram_Order (N); | |
c37bb106 | 3506 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
3507 | |
3508 | -- If we have a separate spec, then the analysis of the declarations | |
3509 | -- caused the entities in the body to be chained to the spec id, but | |
3510 | -- we want them chained to the body id. Only the formal parameters | |
3511 | -- end up chained to the spec id in this case. | |
3512 | ||
3513 | if Present (Spec_Id) then | |
3514 | ||
d39d6bb8 | 3515 | -- We must conform to the categorization of our spec |
996ae0b0 | 3516 | |
d39d6bb8 | 3517 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 3518 | |
d39d6bb8 RD |
3519 | -- And if this is a child unit, the parent units must conform |
3520 | ||
3521 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
3522 | Validate_Categorization_Dependency |
3523 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
3524 | end if; | |
3525 | ||
21d27997 RD |
3526 | -- Here is where we move entities from the spec to the body |
3527 | ||
3528 | -- Case where there are entities that stay with the spec | |
3529 | ||
3530 | if Present (Last_Real_Spec_Entity) then | |
3531 | ||
dbe36d67 AC |
3532 | -- No body entities (happens when the only real spec entities come |
3533 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
3534 | |
3535 | if No (Last_Entity (Body_Id)) then | |
3536 | Set_First_Entity | |
3537 | (Body_Id, Next_Entity (Last_Real_Spec_Entity)); | |
3538 | ||
3539 | -- Body entities present (formals), so chain stuff past them | |
3540 | ||
3541 | else | |
3542 | Set_Next_Entity | |
3543 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
3544 | end if; | |
3545 | ||
3546 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 3547 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
3548 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
3549 | ||
dbe36d67 AC |
3550 | -- Case where there are no spec entities, in this case there can be |
3551 | -- no body entities either, so just move everything. | |
996ae0b0 RK |
3552 | |
3553 | else | |
21d27997 | 3554 | pragma Assert (No (Last_Entity (Body_Id))); |
996ae0b0 RK |
3555 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
3556 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
3557 | Set_First_Entity (Spec_Id, Empty); | |
3558 | Set_Last_Entity (Spec_Id, Empty); | |
3559 | end if; | |
3560 | end if; | |
3561 | ||
7665e4bd | 3562 | Check_Missing_Return; |
996ae0b0 | 3563 | |
82c80734 | 3564 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
3565 | -- the body of the procedure. But first we deal with a special case |
3566 | -- where we want to modify this check. If the body of the subprogram | |
3567 | -- starts with a raise statement or its equivalent, or if the body | |
cf3e6845 AC |
3568 | -- consists entirely of a null statement, then it is pretty obvious that |
3569 | -- it is OK to not reference the parameters. For example, this might be | |
3570 | -- the following common idiom for a stubbed function: statement of the | |
3571 | -- procedure raises an exception. In particular this deals with the | |
3572 | -- common idiom of a stubbed function, which appears something like: | |
fbf5a39b AC |
3573 | |
3574 | -- function F (A : Integer) return Some_Type; | |
3575 | -- X : Some_Type; | |
3576 | -- begin | |
3577 | -- raise Program_Error; | |
3578 | -- return X; | |
3579 | -- end F; | |
3580 | ||
76a69663 ES |
3581 | -- Here the purpose of X is simply to satisfy the annoying requirement |
3582 | -- in Ada that there be at least one return, and we certainly do not | |
a90bd866 | 3583 | -- want to go posting warnings on X that it is not initialized. On |
76a69663 ES |
3584 | -- the other hand, if X is entirely unreferenced that should still |
3585 | -- get a warning. | |
3586 | ||
3587 | -- What we do is to detect these cases, and if we find them, flag the | |
3588 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
3589 | -- suppress unwanted warnings. For the case of the function stub above | |
3590 | -- we have a special test to set X as apparently assigned to suppress | |
3591 | -- the warning. | |
996ae0b0 RK |
3592 | |
3593 | declare | |
800621e0 | 3594 | Stm : Node_Id; |
996ae0b0 RK |
3595 | |
3596 | begin | |
0a36105d JM |
3597 | -- Skip initial labels (for one thing this occurs when we are in |
3598 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
3599 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 3600 | |
800621e0 | 3601 | Stm := First (Statements (HSS)); |
0a36105d JM |
3602 | while Nkind (Stm) = N_Label |
3603 | or else Nkind (Stm) in N_Push_xxx_Label | |
3604 | loop | |
996ae0b0 | 3605 | Next (Stm); |
0a36105d | 3606 | end loop; |
996ae0b0 | 3607 | |
fbf5a39b AC |
3608 | -- Do the test on the original statement before expansion |
3609 | ||
3610 | declare | |
3611 | Ostm : constant Node_Id := Original_Node (Stm); | |
3612 | ||
3613 | begin | |
76a69663 | 3614 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
3615 | |
3616 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
3617 | Set_Trivial_Subprogram (Stm); |
3618 | ||
f3d57416 | 3619 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
3620 | |
3621 | elsif Nkind (Stm) = N_Null_Statement | |
3622 | and then Comes_From_Source (Stm) | |
3623 | and then No (Next (Stm)) | |
3624 | then | |
3625 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
3626 | |
3627 | -- Check for explicit call cases which likely raise an exception | |
3628 | ||
3629 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
3630 | if Is_Entity_Name (Name (Ostm)) then | |
3631 | declare | |
3632 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
3633 | ||
3634 | begin | |
3635 | -- If the procedure is marked No_Return, then likely it | |
3636 | -- raises an exception, but in any case it is not coming | |
76a69663 | 3637 | -- back here, so turn on the flag. |
fbf5a39b | 3638 | |
f46faa08 AC |
3639 | if Present (Ent) |
3640 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
3641 | and then No_Return (Ent) |
3642 | then | |
76a69663 | 3643 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
3644 | end if; |
3645 | end; | |
3646 | end if; | |
3647 | end if; | |
3648 | end; | |
996ae0b0 RK |
3649 | end; |
3650 | ||
3651 | -- Check for variables that are never modified | |
3652 | ||
3653 | declare | |
3654 | E1, E2 : Entity_Id; | |
3655 | ||
3656 | begin | |
fbf5a39b | 3657 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
3658 | -- flags from out parameters to the corresponding entities in the |
3659 | -- body. The reason we do that is we want to post error flags on | |
3660 | -- the body entities, not the spec entities. | |
3661 | ||
3662 | if Present (Spec_Id) then | |
3663 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
3664 | while Present (E1) loop |
3665 | if Ekind (E1) = E_Out_Parameter then | |
3666 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 3667 | while Present (E2) loop |
996ae0b0 RK |
3668 | exit when Chars (E1) = Chars (E2); |
3669 | Next_Entity (E2); | |
3670 | end loop; | |
3671 | ||
fbf5a39b AC |
3672 | if Present (E2) then |
3673 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
3674 | end if; | |
996ae0b0 RK |
3675 | end if; |
3676 | ||
3677 | Next_Entity (E1); | |
3678 | end loop; | |
3679 | end if; | |
3680 | ||
2aca76d6 | 3681 | -- Check references in body |
0868e09c | 3682 | |
2aca76d6 | 3683 | Check_References (Body_Id); |
996ae0b0 | 3684 | end; |
b1b543d2 | 3685 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 | 3686 | |
5afe5d2d HK |
3687 | --------------------------------- |
3688 | -- Analyze_Subprogram_Contract -- | |
3689 | --------------------------------- | |
3690 | ||
3691 | procedure Analyze_Subprogram_Contract (Subp : Entity_Id) is | |
36eef04a AC |
3692 | Items : constant Node_Id := Contract (Subp); |
3693 | Case_Prag : Node_Id := Empty; | |
3694 | Depends : Node_Id := Empty; | |
3695 | Global : Node_Id := Empty; | |
c61ef416 | 3696 | Mode : SPARK_Mode_Type; |
36eef04a AC |
3697 | Nam : Name_Id; |
3698 | Post_Prag : Node_Id := Empty; | |
3699 | Prag : Node_Id; | |
3700 | Seen_In_Case : Boolean := False; | |
3701 | Seen_In_Post : Boolean := False; | |
5afe5d2d HK |
3702 | |
3703 | begin | |
fc999c5d RD |
3704 | -- Due to the timing of contract analysis, delayed pragmas may be |
3705 | -- subject to the wrong SPARK_Mode, usually that of the enclosing | |
3706 | -- context. To remedy this, restore the original SPARK_Mode of the | |
3707 | -- related subprogram body. | |
3708 | ||
c61ef416 AC |
3709 | Save_SPARK_Mode_And_Set (Subp, Mode); |
3710 | ||
5afe5d2d HK |
3711 | if Present (Items) then |
3712 | ||
3713 | -- Analyze pre- and postconditions | |
3714 | ||
3715 | Prag := Pre_Post_Conditions (Items); | |
3716 | while Present (Prag) loop | |
ea3c0651 | 3717 | Analyze_Pre_Post_Condition_In_Decl_Part (Prag, Subp); |
5afe5d2d HK |
3718 | |
3719 | -- Verify whether a postcondition mentions attribute 'Result and | |
3720 | -- its expression introduces a post-state. | |
3721 | ||
3722 | if Warn_On_Suspicious_Contract | |
3723 | and then Pragma_Name (Prag) = Name_Postcondition | |
3724 | then | |
36eef04a AC |
3725 | Post_Prag := Prag; |
3726 | Check_Result_And_Post_State (Prag, Seen_In_Post); | |
5afe5d2d HK |
3727 | end if; |
3728 | ||
3729 | Prag := Next_Pragma (Prag); | |
3730 | end loop; | |
3731 | ||
3732 | -- Analyze contract-cases and test-cases | |
3733 | ||
3734 | Prag := Contract_Test_Cases (Items); | |
3735 | while Present (Prag) loop | |
ea3c0651 AC |
3736 | Nam := Pragma_Name (Prag); |
3737 | ||
3738 | if Nam = Name_Contract_Cases then | |
5afe5d2d HK |
3739 | Analyze_Contract_Cases_In_Decl_Part (Prag); |
3740 | ||
3741 | -- Verify whether contract-cases mention attribute 'Result and | |
3742 | -- its expression introduces a post-state. Perform the check | |
3743 | -- only when the pragma is legal. | |
3744 | ||
3745 | if Warn_On_Suspicious_Contract | |
3746 | and then not Error_Posted (Prag) | |
3747 | then | |
36eef04a AC |
3748 | Case_Prag := Prag; |
3749 | Check_Result_And_Post_State (Prag, Seen_In_Case); | |
5afe5d2d HK |
3750 | end if; |
3751 | ||
3752 | else | |
ea3c0651 | 3753 | pragma Assert (Nam = Name_Test_Case); |
5afe5d2d HK |
3754 | Analyze_Test_Case_In_Decl_Part (Prag, Subp); |
3755 | end if; | |
3756 | ||
3757 | Prag := Next_Pragma (Prag); | |
3758 | end loop; | |
3759 | ||
3760 | -- Analyze classification pragmas | |
3761 | ||
6c3c671e | 3762 | Prag := Classifications (Items); |
5afe5d2d | 3763 | while Present (Prag) loop |
ea3c0651 AC |
3764 | Nam := Pragma_Name (Prag); |
3765 | ||
3766 | if Nam = Name_Depends then | |
54e28df2 HK |
3767 | Depends := Prag; |
3768 | else pragma Assert (Nam = Name_Global); | |
3769 | Global := Prag; | |
5afe5d2d HK |
3770 | end if; |
3771 | ||
3772 | Prag := Next_Pragma (Prag); | |
3773 | end loop; | |
54e28df2 HK |
3774 | |
3775 | -- Analyze Global first as Depends may mention items classified in | |
3776 | -- the global categorization. | |
3777 | ||
3778 | if Present (Global) then | |
3779 | Analyze_Global_In_Decl_Part (Global); | |
3780 | end if; | |
3781 | ||
3782 | -- Depends must be analyzed after Global in order to see the modes of | |
3783 | -- all global items. | |
3784 | ||
3785 | if Present (Depends) then | |
3786 | Analyze_Depends_In_Decl_Part (Depends); | |
3787 | end if; | |
5afe5d2d HK |
3788 | end if; |
3789 | ||
36eef04a | 3790 | -- Emit an error when neither the postconditions nor the contract-cases |
5afe5d2d HK |
3791 | -- mention attribute 'Result in the context of a function. |
3792 | ||
3793 | if Warn_On_Suspicious_Contract | |
3794 | and then Ekind_In (Subp, E_Function, E_Generic_Function) | |
5afe5d2d | 3795 | then |
36eef04a AC |
3796 | if Present (Case_Prag) |
3797 | and then not Seen_In_Case | |
3798 | and then Present (Post_Prag) | |
3799 | and then not Seen_In_Post | |
3800 | then | |
5afe5d2d HK |
3801 | Error_Msg_N |
3802 | ("neither function postcondition nor contract cases mention " | |
36eef04a | 3803 | & "result?T?", Post_Prag); |
5afe5d2d | 3804 | |
36eef04a | 3805 | elsif Present (Case_Prag) and then not Seen_In_Case then |
5afe5d2d | 3806 | Error_Msg_N |
36eef04a | 3807 | ("contract cases do not mention result?T?", Case_Prag); |
5afe5d2d | 3808 | |
f660fba6 AC |
3809 | -- OK if we have at least one IN OUT parameter |
3810 | ||
36eef04a | 3811 | elsif Present (Post_Prag) and then not Seen_In_Post then |
f660fba6 AC |
3812 | declare |
3813 | F : Entity_Id; | |
3814 | begin | |
3815 | F := First_Formal (Subp); | |
3816 | while Present (F) loop | |
3817 | if Ekind (F) = E_In_Out_Parameter then | |
3818 | return; | |
3819 | else | |
3820 | Next_Formal (F); | |
3821 | end if; | |
3822 | end loop; | |
3823 | end; | |
3824 | ||
3825 | -- If no in-out parameters and no mention of Result, the contract | |
3826 | -- is certainly suspicious. | |
3827 | ||
5afe5d2d | 3828 | Error_Msg_N |
36eef04a | 3829 | ("function postcondition does not mention result?T?", Post_Prag); |
5afe5d2d HK |
3830 | end if; |
3831 | end if; | |
c61ef416 | 3832 | |
fc999c5d RD |
3833 | -- Restore the SPARK_Mode of the enclosing context after all delayed |
3834 | -- pragmas have been analyzed. | |
3835 | ||
c61ef416 | 3836 | Restore_SPARK_Mode (Mode); |
5afe5d2d HK |
3837 | end Analyze_Subprogram_Contract; |
3838 | ||
996ae0b0 RK |
3839 | ------------------------------------ |
3840 | -- Analyze_Subprogram_Declaration -- | |
3841 | ------------------------------------ | |
3842 | ||
3843 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
579847c2 | 3844 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc | 3845 | Designator : Entity_Id; |
579847c2 | 3846 | |
4d8f3296 ES |
3847 | Is_Completion : Boolean; |
3848 | -- Indicates whether a null procedure declaration is a completion | |
996ae0b0 RK |
3849 | |
3850 | begin | |
2ba431e5 | 3851 | -- Null procedures are not allowed in SPARK |
daec8eeb | 3852 | |
fe5d3068 | 3853 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
3854 | and then Null_Present (Specification (N)) |
3855 | then | |
2ba431e5 | 3856 | Check_SPARK_Restriction ("null procedure is not allowed", N); |
718deaf1 | 3857 | |
4d8f3296 ES |
3858 | if Is_Protected_Type (Current_Scope) then |
3859 | Error_Msg_N ("protected operation cannot be a null procedure", N); | |
3860 | end if; | |
718deaf1 | 3861 | |
4d8f3296 | 3862 | Analyze_Null_Procedure (N, Is_Completion); |
718deaf1 | 3863 | |
4d8f3296 | 3864 | if Is_Completion then |
718deaf1 | 3865 | |
4d8f3296 | 3866 | -- The null procedure acts as a body, nothing further is needed. |
5d5832bc | 3867 | |
4d8f3296 | 3868 | return; |
5d5832bc AC |
3869 | end if; |
3870 | end if; | |
3871 | ||
beacce02 | 3872 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
3873 | |
3874 | -- A reference may already have been generated for the unit name, in | |
3875 | -- which case the following call is redundant. However it is needed for | |
3876 | -- declarations that are the rewriting of an expression function. | |
3877 | ||
5d5832bc AC |
3878 | Generate_Definition (Designator); |
3879 | ||
f90d14ac AC |
3880 | -- Set SPARK mode from current context (may be overwritten later with |
3881 | -- explicit pragma). | |
4a854847 | 3882 | |
f90d14ac AC |
3883 | Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
3884 | Set_SPARK_Pragma_Inherited (Designator, True); | |
579847c2 | 3885 | |
b1b543d2 BD |
3886 | if Debug_Flag_C then |
3887 | Write_Str ("==> subprogram spec "); | |
3888 | Write_Name (Chars (Designator)); | |
3889 | Write_Str (" from "); | |
3890 | Write_Location (Sloc (N)); | |
3891 | Write_Eol; | |
3892 | Indent; | |
3893 | end if; | |
3894 | ||
996ae0b0 | 3895 | Validate_RCI_Subprogram_Declaration (N); |
996ae0b0 RK |
3896 | New_Overloaded_Entity (Designator); |
3897 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 3898 | |
cf3e6845 AC |
3899 | -- If the type of the first formal of the current subprogram is a non- |
3900 | -- generic tagged private type, mark the subprogram as being a private | |
3901 | -- primitive. Ditto if this is a function with controlling result, and | |
3902 | -- the return type is currently private. In both cases, the type of the | |
3903 | -- controlling argument or result must be in the current scope for the | |
3904 | -- operation to be primitive. | |
6ca063eb AC |
3905 | |
3906 | if Has_Controlling_Result (Designator) | |
3907 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 3908 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
3909 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
3910 | then | |
3911 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 3912 | |
6ca063eb | 3913 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
3914 | declare |
3915 | Formal_Typ : constant Entity_Id := | |
3916 | Etype (First_Formal (Designator)); | |
3917 | begin | |
3918 | Set_Is_Private_Primitive (Designator, | |
3919 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 3920 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
3921 | and then Is_Private_Type (Formal_Typ) |
3922 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
3923 | end; | |
3924 | end if; | |
3925 | ||
ec4867fa ES |
3926 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
3927 | -- or null. | |
3928 | ||
0791fbe9 | 3929 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
3930 | and then Comes_From_Source (N) |
3931 | and then Is_Dispatching_Operation (Designator) | |
3932 | then | |
3933 | declare | |
3934 | E : Entity_Id; | |
3935 | Etyp : Entity_Id; | |
3936 | ||
3937 | begin | |
3938 | if Has_Controlling_Result (Designator) then | |
3939 | Etyp := Etype (Designator); | |
3940 | ||
3941 | else | |
3942 | E := First_Entity (Designator); | |
3943 | while Present (E) | |
3944 | and then Is_Formal (E) | |
3945 | and then not Is_Controlling_Formal (E) | |
3946 | loop | |
3947 | Next_Entity (E); | |
3948 | end loop; | |
3949 | ||
3950 | Etyp := Etype (E); | |
3951 | end if; | |
3952 | ||
3953 | if Is_Access_Type (Etyp) then | |
3954 | Etyp := Directly_Designated_Type (Etyp); | |
3955 | end if; | |
3956 | ||
3957 | if Is_Interface (Etyp) | |
f937473f | 3958 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa | 3959 | and then not (Ekind (Designator) = E_Procedure |
8fde064e | 3960 | and then Null_Present (Specification (N))) |
ec4867fa ES |
3961 | then |
3962 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
3963 | |
3964 | -- Specialize error message based on procedures vs. functions, | |
3965 | -- since functions can't be null subprograms. | |
3966 | ||
3967 | if Ekind (Designator) = E_Procedure then | |
3968 | Error_Msg_N | |
3969 | ("interface procedure % must be abstract or null", N); | |
3970 | else | |
3971 | Error_Msg_N ("interface function % must be abstract", N); | |
3972 | end if; | |
ec4867fa ES |
3973 | end if; |
3974 | end; | |
3975 | end if; | |
3976 | ||
fbf5a39b AC |
3977 | -- What is the following code for, it used to be |
3978 | ||
3979 | -- ??? Set_Suppress_Elaboration_Checks | |
3980 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
3981 | ||
3982 | -- The following seems equivalent, but a bit dubious | |
3983 | ||
3984 | if Elaboration_Checks_Suppressed (Designator) then | |
3985 | Set_Kill_Elaboration_Checks (Designator); | |
3986 | end if; | |
996ae0b0 | 3987 | |
8fde064e | 3988 | if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then |
fbf5a39b | 3989 | Set_Categorization_From_Scope (Designator, Scop); |
8fde064e | 3990 | |
996ae0b0 | 3991 | else |
e895b435 | 3992 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 3993 | |
0a36105d | 3994 | Push_Scope (Designator); |
996ae0b0 RK |
3995 | Set_Categorization_From_Pragmas (N); |
3996 | Validate_Categorization_Dependency (N, Designator); | |
3997 | Pop_Scope; | |
3998 | end if; | |
3999 | ||
4000 | -- For a compilation unit, set body required. This flag will only be | |
4001 | -- reset if a valid Import or Interface pragma is processed later on. | |
4002 | ||
4003 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
4004 | Set_Body_Required (Parent (N), True); | |
758c442c | 4005 | |
0791fbe9 | 4006 | if Ada_Version >= Ada_2005 |
758c442c GD |
4007 | and then Nkind (Specification (N)) = N_Procedure_Specification |
4008 | and then Null_Present (Specification (N)) | |
4009 | then | |
4010 | Error_Msg_N | |
4011 | ("null procedure cannot be declared at library level", N); | |
4012 | end if; | |
996ae0b0 RK |
4013 | end if; |
4014 | ||
fbf5a39b | 4015 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 4016 | Check_Eliminated (Designator); |
fbf5a39b | 4017 | |
b1b543d2 BD |
4018 | if Debug_Flag_C then |
4019 | Outdent; | |
4020 | Write_Str ("<== subprogram spec "); | |
4021 | Write_Name (Chars (Designator)); | |
4022 | Write_Str (" from "); | |
4023 | Write_Location (Sloc (N)); | |
4024 | Write_Eol; | |
4025 | end if; | |
0f1a6a0b | 4026 | |
1a265e78 AC |
4027 | if Is_Protected_Type (Current_Scope) then |
4028 | ||
4029 | -- Indicate that this is a protected operation, because it may be | |
4030 | -- used in subsequent declarations within the protected type. | |
4031 | ||
4032 | Set_Convention (Designator, Convention_Protected); | |
4033 | end if; | |
4034 | ||
beacce02 | 4035 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
4036 | |
4037 | if Has_Aspects (N) then | |
4038 | Analyze_Aspect_Specifications (N, Designator); | |
4039 | end if; | |
996ae0b0 RK |
4040 | end Analyze_Subprogram_Declaration; |
4041 | ||
fbf5a39b AC |
4042 | -------------------------------------- |
4043 | -- Analyze_Subprogram_Specification -- | |
4044 | -------------------------------------- | |
4045 | ||
4046 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
4047 | -- declaration). This procedure is called to analyze the specification in | |
4048 | -- both subprogram bodies and subprogram declarations (specs). | |
4049 | ||
4050 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
4051 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 4052 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 4053 | |
758c442c GD |
4054 | -- Start of processing for Analyze_Subprogram_Specification |
4055 | ||
fbf5a39b | 4056 | begin |
2ba431e5 | 4057 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 4058 | |
db72f10a AC |
4059 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
4060 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
4061 | then | |
2ba431e5 | 4062 | Check_SPARK_Restriction ("user-defined operator is not allowed", N); |
38171f43 AC |
4063 | end if; |
4064 | ||
31af8899 AC |
4065 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
4066 | -- specification comes from an expression function, because it may be | |
4067 | -- the completion of a previous declaration. It is is not, the cross- | |
4068 | -- reference entry will be emitted for the new subprogram declaration. | |
4069 | ||
4070 | if Nkind (Parent (N)) /= N_Expression_Function then | |
4071 | Generate_Definition (Designator); | |
4072 | end if; | |
38171f43 | 4073 | |
dac3bede | 4074 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
fbf5a39b AC |
4075 | |
4076 | if Nkind (N) = N_Function_Specification then | |
4077 | Set_Ekind (Designator, E_Function); | |
4078 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
4079 | else |
4080 | Set_Ekind (Designator, E_Procedure); | |
4081 | Set_Etype (Designator, Standard_Void_Type); | |
4082 | end if; | |
4083 | ||
800621e0 | 4084 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
4085 | |
4086 | Set_Scope (Designator, Current_Scope); | |
4087 | ||
fbf5a39b | 4088 | if Present (Formals) then |
0a36105d | 4089 | Push_Scope (Designator); |
fbf5a39b | 4090 | Process_Formals (Formals, N); |
758c442c | 4091 | |
0929eaeb AC |
4092 | -- Check dimensions in N for formals with default expression |
4093 | ||
4094 | Analyze_Dimension_Formals (N, Formals); | |
4095 | ||
a38ff9b1 ES |
4096 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
4097 | -- inherited interface operation, and the controlling type is | |
4098 | -- a synchronized type, replace the type with its corresponding | |
4099 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
4100 | -- Same processing for an access parameter whose designated type is |
4101 | -- derived from a synchronized interface. | |
758c442c | 4102 | |
0791fbe9 | 4103 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
4104 | declare |
4105 | Formal : Entity_Id; | |
4106 | Formal_Typ : Entity_Id; | |
4107 | Rec_Typ : Entity_Id; | |
69cb258c | 4108 | Desig_Typ : Entity_Id; |
0a36105d | 4109 | |
d44202ba HK |
4110 | begin |
4111 | Formal := First_Formal (Designator); | |
4112 | while Present (Formal) loop | |
4113 | Formal_Typ := Etype (Formal); | |
0a36105d | 4114 | |
d44202ba HK |
4115 | if Is_Concurrent_Type (Formal_Typ) |
4116 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
4117 | then | |
4118 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
4119 | ||
4120 | if Present (Interfaces (Rec_Typ)) then | |
4121 | Set_Etype (Formal, Rec_Typ); | |
4122 | end if; | |
69cb258c AC |
4123 | |
4124 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
4125 | Desig_Typ := Designated_Type (Formal_Typ); | |
4126 | ||
4127 | if Is_Concurrent_Type (Desig_Typ) | |
4128 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
4129 | then | |
4130 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
4131 | ||
4132 | if Present (Interfaces (Rec_Typ)) then | |
4133 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
4134 | end if; | |
4135 | end if; | |
d44202ba HK |
4136 | end if; |
4137 | ||
4138 | Next_Formal (Formal); | |
4139 | end loop; | |
4140 | end; | |
758c442c GD |
4141 | end if; |
4142 | ||
fbf5a39b | 4143 | End_Scope; |
82c80734 | 4144 | |
b66c3ff4 AC |
4145 | -- The subprogram scope is pushed and popped around the processing of |
4146 | -- the return type for consistency with call above to Process_Formals | |
4147 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
4148 | -- itype created for the return type will be associated with the proper | |
4149 | -- scope. | |
4150 | ||
82c80734 | 4151 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 4152 | Push_Scope (Designator); |
82c80734 | 4153 | Analyze_Return_Type (N); |
b66c3ff4 | 4154 | End_Scope; |
fbf5a39b AC |
4155 | end if; |
4156 | ||
e606088a AC |
4157 | -- Function case |
4158 | ||
fbf5a39b | 4159 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
4160 | |
4161 | -- Deal with operator symbol case | |
4162 | ||
fbf5a39b AC |
4163 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
4164 | Valid_Operator_Definition (Designator); | |
4165 | end if; | |
4166 | ||
4167 | May_Need_Actuals (Designator); | |
4168 | ||
fe63b1b1 ES |
4169 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
4170 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
4171 | -- declarations, where abstractness is inherited, and to subprogram |
4172 | -- bodies generated for stream operations, which become renamings as | |
4173 | -- bodies. | |
2bfb1b72 | 4174 | |
fe63b1b1 ES |
4175 | -- In case of primitives associated with abstract interface types |
4176 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 4177 | |
1adaea16 AC |
4178 | if not Nkind_In (Original_Node (Parent (N)), |
4179 | N_Subprogram_Renaming_Declaration, | |
4180 | N_Abstract_Subprogram_Declaration, | |
4181 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 4182 | then |
2e79de51 AC |
4183 | if Is_Abstract_Type (Etype (Designator)) |
4184 | and then not Is_Interface (Etype (Designator)) | |
4185 | then | |
4186 | Error_Msg_N | |
4187 | ("function that returns abstract type must be abstract", N); | |
4188 | ||
e606088a | 4189 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
4190 | -- access result whose designated type is abstract. |
4191 | ||
4192 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
4193 | and then | |
4194 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
4195 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 4196 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
4197 | then |
4198 | Error_Msg_N ("function whose access result designates " | |
4199 | & "abstract type must be abstract", N); | |
4200 | end if; | |
fbf5a39b AC |
4201 | end if; |
4202 | end if; | |
4203 | ||
4204 | return Designator; | |
4205 | end Analyze_Subprogram_Specification; | |
4206 | ||
996ae0b0 RK |
4207 | -------------------------- |
4208 | -- Build_Body_To_Inline -- | |
4209 | -------------------------- | |
4210 | ||
d05ef0ab | 4211 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id) is |
f937473f | 4212 | Decl : constant Node_Id := Unit_Declaration_Node (Subp); |
996ae0b0 RK |
4213 | Original_Body : Node_Id; |
4214 | Body_To_Analyze : Node_Id; | |
4215 | Max_Size : constant := 10; | |
4216 | Stat_Count : Integer := 0; | |
4217 | ||
4218 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
e895b435 | 4219 | -- Check for declarations that make inlining not worthwhile |
996ae0b0 RK |
4220 | |
4221 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
82c80734 RD |
4222 | -- Check for statements that make inlining not worthwhile: any tasking |
4223 | -- statement, nested at any level. Keep track of total number of | |
4224 | -- elementary statements, as a measure of acceptable size. | |
996ae0b0 RK |
4225 | |
4226 | function Has_Pending_Instantiation return Boolean; | |
f937473f RD |
4227 | -- If some enclosing body contains instantiations that appear before the |
4228 | -- corresponding generic body, the enclosing body has a freeze node so | |
4229 | -- that it can be elaborated after the generic itself. This might | |
996ae0b0 RK |
4230 | -- conflict with subsequent inlinings, so that it is unsafe to try to |
4231 | -- inline in such a case. | |
4232 | ||
c8ef728f | 4233 | function Has_Single_Return return Boolean; |
f937473f RD |
4234 | -- In general we cannot inline functions that return unconstrained type. |
4235 | -- However, we can handle such functions if all return statements return | |
4236 | -- a local variable that is the only declaration in the body of the | |
4237 | -- function. In that case the call can be replaced by that local | |
4238 | -- variable as is done for other inlined calls. | |
c8ef728f | 4239 | |
fbf5a39b | 4240 | procedure Remove_Pragmas; |
76a69663 ES |
4241 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal |
4242 | -- parameter has no meaning when the body is inlined and the formals | |
4243 | -- are rewritten. Remove it from body to inline. The analysis of the | |
4244 | -- non-inlined body will handle the pragma properly. | |
996ae0b0 | 4245 | |
e895b435 ES |
4246 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean; |
4247 | -- If the body of the subprogram includes a call that returns an | |
4248 | -- unconstrained type, the secondary stack is involved, and it | |
4249 | -- is not worth inlining. | |
4250 | ||
996ae0b0 RK |
4251 | ------------------------------ |
4252 | -- Has_Excluded_Declaration -- | |
4253 | ------------------------------ | |
4254 | ||
4255 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
4256 | D : Node_Id; | |
4257 | ||
fbf5a39b | 4258 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; |
82c80734 RD |
4259 | -- Nested subprograms make a given body ineligible for inlining, but |
4260 | -- we make an exception for instantiations of unchecked conversion. | |
4261 | -- The body has not been analyzed yet, so check the name, and verify | |
4262 | -- that the visible entity with that name is the predefined unit. | |
4263 | ||
4264 | ----------------------------- | |
4265 | -- Is_Unchecked_Conversion -- | |
4266 | ----------------------------- | |
fbf5a39b AC |
4267 | |
4268 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
82c80734 | 4269 | Id : constant Node_Id := Name (D); |
fbf5a39b AC |
4270 | Conv : Entity_Id; |
4271 | ||
4272 | begin | |
4273 | if Nkind (Id) = N_Identifier | |
4274 | and then Chars (Id) = Name_Unchecked_Conversion | |
4275 | then | |
4276 | Conv := Current_Entity (Id); | |
4277 | ||
800621e0 | 4278 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) |
fbf5a39b AC |
4279 | and then Chars (Selector_Name (Id)) = Name_Unchecked_Conversion |
4280 | then | |
4281 | Conv := Current_Entity (Selector_Name (Id)); | |
fbf5a39b AC |
4282 | else |
4283 | return False; | |
4284 | end if; | |
4285 | ||
758c442c GD |
4286 | return Present (Conv) |
4287 | and then Is_Predefined_File_Name | |
4288 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
fbf5a39b AC |
4289 | and then Is_Intrinsic_Subprogram (Conv); |
4290 | end Is_Unchecked_Conversion; | |
4291 | ||
4292 | -- Start of processing for Has_Excluded_Declaration | |
4293 | ||
996ae0b0 RK |
4294 | begin |
4295 | D := First (Decls); | |
996ae0b0 | 4296 | while Present (D) loop |
800621e0 RD |
4297 | if (Nkind (D) = N_Function_Instantiation |
4298 | and then not Is_Unchecked_Conversion (D)) | |
4299 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
4300 | N_Package_Declaration, | |
4301 | N_Package_Instantiation, | |
4302 | N_Subprogram_Body, | |
4303 | N_Procedure_Instantiation, | |
4304 | N_Task_Type_Declaration) | |
996ae0b0 RK |
4305 | then |
4306 | Cannot_Inline | |
fbf5a39b | 4307 | ("cannot inline & (non-allowed declaration)?", D, Subp); |
996ae0b0 RK |
4308 | return True; |
4309 | end if; | |
4310 | ||
4311 | Next (D); | |
4312 | end loop; | |
4313 | ||
4314 | return False; | |
996ae0b0 RK |
4315 | end Has_Excluded_Declaration; |
4316 | ||
4317 | ---------------------------- | |
4318 | -- Has_Excluded_Statement -- | |
4319 | ---------------------------- | |
4320 | ||
4321 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
4322 | S : Node_Id; | |
4323 | E : Node_Id; | |
4324 | ||
4325 | begin | |
4326 | S := First (Stats); | |
996ae0b0 RK |
4327 | while Present (S) loop |
4328 | Stat_Count := Stat_Count + 1; | |
4329 | ||
800621e0 RD |
4330 | if Nkind_In (S, N_Abort_Statement, |
4331 | N_Asynchronous_Select, | |
4332 | N_Conditional_Entry_Call, | |
4333 | N_Delay_Relative_Statement, | |
4334 | N_Delay_Until_Statement, | |
4335 | N_Selective_Accept, | |
4336 | N_Timed_Entry_Call) | |
996ae0b0 RK |
4337 | then |
4338 | Cannot_Inline | |
fbf5a39b | 4339 | ("cannot inline & (non-allowed statement)?", S, Subp); |
996ae0b0 RK |
4340 | return True; |
4341 | ||
4342 | elsif Nkind (S) = N_Block_Statement then | |
4343 | if Present (Declarations (S)) | |
4344 | and then Has_Excluded_Declaration (Declarations (S)) | |
4345 | then | |
4346 | return True; | |
4347 | ||
4348 | elsif Present (Handled_Statement_Sequence (S)) | |
4349 | and then | |
4350 | (Present | |
4351 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
4352 | or else | |
4353 | Has_Excluded_Statement | |
4354 | (Statements (Handled_Statement_Sequence (S)))) | |
4355 | then | |
4356 | return True; | |
4357 | end if; | |
4358 | ||
4359 | elsif Nkind (S) = N_Case_Statement then | |
4360 | E := First (Alternatives (S)); | |
996ae0b0 RK |
4361 | while Present (E) loop |
4362 | if Has_Excluded_Statement (Statements (E)) then | |
4363 | return True; | |
4364 | end if; | |
4365 | ||
4366 | Next (E); | |
4367 | end loop; | |
4368 | ||
4369 | elsif Nkind (S) = N_If_Statement then | |
4370 | if Has_Excluded_Statement (Then_Statements (S)) then | |
4371 | return True; | |
4372 | end if; | |
4373 | ||
4374 | if Present (Elsif_Parts (S)) then | |
4375 | E := First (Elsif_Parts (S)); | |
996ae0b0 RK |
4376 | while Present (E) loop |
4377 | if Has_Excluded_Statement (Then_Statements (E)) then | |
4378 | return True; | |
4379 | end if; | |
685bc70f | 4380 | |
996ae0b0 RK |
4381 | Next (E); |
4382 | end loop; | |
4383 | end if; | |
4384 | ||
4385 | if Present (Else_Statements (S)) | |
4386 | and then Has_Excluded_Statement (Else_Statements (S)) | |
4387 | then | |
4388 | return True; | |
4389 | end if; | |
4390 | ||
4391 | elsif Nkind (S) = N_Loop_Statement | |
4392 | and then Has_Excluded_Statement (Statements (S)) | |
4393 | then | |
4394 | return True; | |
3e2399ba AC |
4395 | |
4396 | elsif Nkind (S) = N_Extended_Return_Statement then | |
4397 | if Has_Excluded_Statement | |
4398 | (Statements (Handled_Statement_Sequence (S))) | |
4399 | or else Present | |
4400 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
4401 | then | |
4402 | return True; | |
4403 | end if; | |
996ae0b0 RK |
4404 | end if; |
4405 | ||
4406 | Next (S); | |
4407 | end loop; | |
4408 | ||
4409 | return False; | |
4410 | end Has_Excluded_Statement; | |
4411 | ||
4412 | ------------------------------- | |
4413 | -- Has_Pending_Instantiation -- | |
4414 | ------------------------------- | |
4415 | ||
4416 | function Has_Pending_Instantiation return Boolean is | |
ec4867fa | 4417 | S : Entity_Id; |
996ae0b0 RK |
4418 | |
4419 | begin | |
ec4867fa | 4420 | S := Current_Scope; |
996ae0b0 RK |
4421 | while Present (S) loop |
4422 | if Is_Compilation_Unit (S) | |
4423 | or else Is_Child_Unit (S) | |
4424 | then | |
4425 | return False; | |
bce79204 | 4426 | |
996ae0b0 RK |
4427 | elsif Ekind (S) = E_Package |
4428 | and then Has_Forward_Instantiation (S) | |
4429 | then | |
4430 | return True; | |
4431 | end if; | |
4432 | ||
4433 | S := Scope (S); | |
4434 | end loop; | |
4435 | ||
4436 | return False; | |
4437 | end Has_Pending_Instantiation; | |
4438 | ||
c8ef728f ES |
4439 | ------------------------ |
4440 | -- Has_Single_Return -- | |
4441 | ------------------------ | |
4442 | ||
4443 | function Has_Single_Return return Boolean is | |
4444 | Return_Statement : Node_Id := Empty; | |
4445 | ||
4446 | function Check_Return (N : Node_Id) return Traverse_Result; | |
4447 | ||
4448 | ------------------ | |
4449 | -- Check_Return -- | |
4450 | ------------------ | |
4451 | ||
4452 | function Check_Return (N : Node_Id) return Traverse_Result is | |
4453 | begin | |
5d37ba92 | 4454 | if Nkind (N) = N_Simple_Return_Statement then |
c8ef728f ES |
4455 | if Present (Expression (N)) |
4456 | and then Is_Entity_Name (Expression (N)) | |
4457 | then | |
4458 | if No (Return_Statement) then | |
4459 | Return_Statement := N; | |
4460 | return OK; | |
4461 | ||
4462 | elsif Chars (Expression (N)) = | |
4463 | Chars (Expression (Return_Statement)) | |
4464 | then | |
4465 | return OK; | |
4466 | ||
4467 | else | |
4468 | return Abandon; | |
4469 | end if; | |
4470 | ||
3e2399ba AC |
4471 | -- A return statement within an extended return is a noop |
4472 | -- after inlining. | |
4473 | ||
4474 | elsif No (Expression (N)) | |
4475 | and then Nkind (Parent (Parent (N))) = | |
8fde064e | 4476 | N_Extended_Return_Statement |
3e2399ba AC |
4477 | then |
4478 | return OK; | |
4479 | ||
c8ef728f ES |
4480 | else |
4481 | -- Expression has wrong form | |
4482 | ||
4483 | return Abandon; | |
4484 | end if; | |
4485 | ||
3e2399ba AC |
4486 | -- We can only inline a build-in-place function if |
4487 | -- it has a single extended return. | |
4488 | ||
4489 | elsif Nkind (N) = N_Extended_Return_Statement then | |
4490 | if No (Return_Statement) then | |
4491 | Return_Statement := N; | |
4492 | return OK; | |
4493 | ||
4494 | else | |
4495 | return Abandon; | |
4496 | end if; | |
4497 | ||
c8ef728f ES |
4498 | else |
4499 | return OK; | |
4500 | end if; | |
4501 | end Check_Return; | |
4502 | ||
4503 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
4504 | ||
4505 | -- Start of processing for Has_Single_Return | |
4506 | ||
4507 | begin | |
3e2399ba AC |
4508 | if Check_All_Returns (N) /= OK then |
4509 | return False; | |
4510 | ||
4511 | elsif Nkind (Return_Statement) = N_Extended_Return_Statement then | |
4512 | return True; | |
4513 | ||
4514 | else | |
4515 | return Present (Declarations (N)) | |
4516 | and then Present (First (Declarations (N))) | |
4517 | and then Chars (Expression (Return_Statement)) = | |
8fde064e | 4518 | Chars (Defining_Identifier (First (Declarations (N)))); |
3e2399ba | 4519 | end if; |
c8ef728f ES |
4520 | end Has_Single_Return; |
4521 | ||
fbf5a39b AC |
4522 | -------------------- |
4523 | -- Remove_Pragmas -- | |
4524 | -------------------- | |
4525 | ||
4526 | procedure Remove_Pragmas is | |
4527 | Decl : Node_Id; | |
4528 | Nxt : Node_Id; | |
4529 | ||
4530 | begin | |
4531 | Decl := First (Declarations (Body_To_Analyze)); | |
4532 | while Present (Decl) loop | |
4533 | Nxt := Next (Decl); | |
4534 | ||
4535 | if Nkind (Decl) = N_Pragma | |
b69cd36a AC |
4536 | and then Nam_In (Pragma_Name (Decl), Name_Unreferenced, |
4537 | Name_Unmodified) | |
fbf5a39b AC |
4538 | then |
4539 | Remove (Decl); | |
4540 | end if; | |
4541 | ||
4542 | Decl := Nxt; | |
4543 | end loop; | |
4544 | end Remove_Pragmas; | |
4545 | ||
e895b435 ES |
4546 | -------------------------- |
4547 | -- Uses_Secondary_Stack -- | |
4548 | -------------------------- | |
4549 | ||
4550 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean is | |
4551 | function Check_Call (N : Node_Id) return Traverse_Result; | |
4552 | -- Look for function calls that return an unconstrained type | |
4553 | ||
4554 | ---------------- | |
4555 | -- Check_Call -- | |
4556 | ---------------- | |
4557 | ||
4558 | function Check_Call (N : Node_Id) return Traverse_Result is | |
4559 | begin | |
4560 | if Nkind (N) = N_Function_Call | |
4561 | and then Is_Entity_Name (Name (N)) | |
4562 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
4563 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
4564 | then | |
4565 | Cannot_Inline | |
4566 | ("cannot inline & (call returns unconstrained type)?", | |
685bc70f | 4567 | N, Subp); |
e895b435 ES |
4568 | return Abandon; |
4569 | else | |
4570 | return OK; | |
4571 | end if; | |
4572 | end Check_Call; | |
4573 | ||
4574 | function Check_Calls is new Traverse_Func (Check_Call); | |
4575 | ||
4576 | begin | |
4577 | return Check_Calls (Bod) = Abandon; | |
4578 | end Uses_Secondary_Stack; | |
4579 | ||
996ae0b0 RK |
4580 | -- Start of processing for Build_Body_To_Inline |
4581 | ||
4582 | begin | |
8dbd1460 AC |
4583 | -- Return immediately if done already |
4584 | ||
996ae0b0 RK |
4585 | if Nkind (Decl) = N_Subprogram_Declaration |
4586 | and then Present (Body_To_Inline (Decl)) | |
4587 | then | |
8dbd1460 | 4588 | return; |
996ae0b0 | 4589 | |
08402a6d ES |
4590 | -- Functions that return unconstrained composite types require |
4591 | -- secondary stack handling, and cannot currently be inlined, unless | |
4592 | -- all return statements return a local variable that is the first | |
4593 | -- local declaration in the body. | |
996ae0b0 RK |
4594 | |
4595 | elsif Ekind (Subp) = E_Function | |
4596 | and then not Is_Scalar_Type (Etype (Subp)) | |
4597 | and then not Is_Access_Type (Etype (Subp)) | |
4598 | and then not Is_Constrained (Etype (Subp)) | |
4599 | then | |
08402a6d ES |
4600 | if not Has_Single_Return then |
4601 | Cannot_Inline | |
4602 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
4603 | return; | |
4604 | end if; | |
4605 | ||
4606 | -- Ditto for functions that return controlled types, where controlled | |
4607 | -- actions interfere in complex ways with inlining. | |
2820d220 AC |
4608 | |
4609 | elsif Ekind (Subp) = E_Function | |
048e5cef | 4610 | and then Needs_Finalization (Etype (Subp)) |
2820d220 AC |
4611 | then |
4612 | Cannot_Inline | |
4613 | ("cannot inline & (controlled return type)?", N, Subp); | |
4614 | return; | |
996ae0b0 RK |
4615 | end if; |
4616 | ||
d05ef0ab AC |
4617 | if Present (Declarations (N)) |
4618 | and then Has_Excluded_Declaration (Declarations (N)) | |
996ae0b0 | 4619 | then |
d05ef0ab | 4620 | return; |
996ae0b0 RK |
4621 | end if; |
4622 | ||
4623 | if Present (Handled_Statement_Sequence (N)) then | |
fbf5a39b AC |
4624 | if Present (Exception_Handlers (Handled_Statement_Sequence (N))) then |
4625 | Cannot_Inline | |
4626 | ("cannot inline& (exception handler)?", | |
4627 | First (Exception_Handlers (Handled_Statement_Sequence (N))), | |
4628 | Subp); | |
d05ef0ab | 4629 | return; |
996ae0b0 RK |
4630 | elsif |
4631 | Has_Excluded_Statement | |
4632 | (Statements (Handled_Statement_Sequence (N))) | |
4633 | then | |
d05ef0ab | 4634 | return; |
996ae0b0 RK |
4635 | end if; |
4636 | end if; | |
4637 | ||
4638 | -- We do not inline a subprogram that is too large, unless it is | |
4639 | -- marked Inline_Always. This pragma does not suppress the other | |
4640 | -- checks on inlining (forbidden declarations, handlers, etc). | |
4641 | ||
4642 | if Stat_Count > Max_Size | |
800621e0 | 4643 | and then not Has_Pragma_Inline_Always (Subp) |
996ae0b0 | 4644 | then |
fbf5a39b | 4645 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); |
d05ef0ab | 4646 | return; |
996ae0b0 RK |
4647 | end if; |
4648 | ||
4649 | if Has_Pending_Instantiation then | |
4650 | Cannot_Inline | |
fbf5a39b AC |
4651 | ("cannot inline& (forward instance within enclosing body)?", |
4652 | N, Subp); | |
d05ef0ab AC |
4653 | return; |
4654 | end if; | |
4655 | ||
4656 | -- Within an instance, the body to inline must be treated as a nested | |
4657 | -- generic, so that the proper global references are preserved. | |
4658 | ||
ce4e59c4 ST |
4659 | -- Note that we do not do this at the library level, because it is not |
4660 | -- needed, and furthermore this causes trouble if front end inlining | |
4661 | -- is activated (-gnatN). | |
4662 | ||
4663 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
4664 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); |
4665 | Original_Body := Copy_Generic_Node (N, Empty, True); | |
4666 | else | |
4667 | Original_Body := Copy_Separate_Tree (N); | |
996ae0b0 RK |
4668 | end if; |
4669 | ||
d05ef0ab AC |
4670 | -- We need to capture references to the formals in order to substitute |
4671 | -- the actuals at the point of inlining, i.e. instantiation. To treat | |
4672 | -- the formals as globals to the body to inline, we nest it within | |
4673 | -- a dummy parameterless subprogram, declared within the real one. | |
24105bab AC |
4674 | -- To avoid generating an internal name (which is never public, and |
4675 | -- which affects serial numbers of other generated names), we use | |
4676 | -- an internal symbol that cannot conflict with user declarations. | |
d05ef0ab AC |
4677 | |
4678 | Set_Parameter_Specifications (Specification (Original_Body), No_List); | |
24105bab AC |
4679 | Set_Defining_Unit_Name |
4680 | (Specification (Original_Body), | |
4681 | Make_Defining_Identifier (Sloc (N), Name_uParent)); | |
d05ef0ab AC |
4682 | Set_Corresponding_Spec (Original_Body, Empty); |
4683 | ||
996ae0b0 RK |
4684 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); |
4685 | ||
4686 | -- Set return type of function, which is also global and does not need | |
4687 | -- to be resolved. | |
4688 | ||
4689 | if Ekind (Subp) = E_Function then | |
41251c60 | 4690 | Set_Result_Definition (Specification (Body_To_Analyze), |
996ae0b0 RK |
4691 | New_Occurrence_Of (Etype (Subp), Sloc (N))); |
4692 | end if; | |
4693 | ||
4694 | if No (Declarations (N)) then | |
4695 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
4696 | else | |
4697 | Append (Body_To_Analyze, Declarations (N)); | |
4698 | end if; | |
4699 | ||
4700 | Expander_Mode_Save_And_Set (False); | |
fbf5a39b | 4701 | Remove_Pragmas; |
996ae0b0 RK |
4702 | |
4703 | Analyze (Body_To_Analyze); | |
0a36105d | 4704 | Push_Scope (Defining_Entity (Body_To_Analyze)); |
996ae0b0 RK |
4705 | Save_Global_References (Original_Body); |
4706 | End_Scope; | |
4707 | Remove (Body_To_Analyze); | |
4708 | ||
4709 | Expander_Mode_Restore; | |
d05ef0ab | 4710 | |
ce4e59c4 ST |
4711 | -- Restore environment if previously saved |
4712 | ||
4713 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
4714 | Restore_Env; |
4715 | end if; | |
e895b435 ES |
4716 | |
4717 | -- If secondary stk used there is no point in inlining. We have | |
4718 | -- already issued the warning in this case, so nothing to do. | |
4719 | ||
4720 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
4721 | return; | |
4722 | end if; | |
4723 | ||
4724 | Set_Body_To_Inline (Decl, Original_Body); | |
4725 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Subp)); | |
4726 | Set_Is_Inlined (Subp); | |
996ae0b0 RK |
4727 | end Build_Body_To_Inline; |
4728 | ||
fbf5a39b AC |
4729 | ------------------- |
4730 | -- Cannot_Inline -- | |
4731 | ------------------- | |
4732 | ||
84f4072a JM |
4733 | procedure Cannot_Inline |
4734 | (Msg : String; | |
4735 | N : Node_Id; | |
4736 | Subp : Entity_Id; | |
bde73c6b AC |
4737 | Is_Serious : Boolean := False) |
4738 | is | |
fbf5a39b | 4739 | begin |
84f4072a | 4740 | pragma Assert (Msg (Msg'Last) = '?'); |
fbf5a39b | 4741 | |
84f4072a JM |
4742 | -- Old semantics |
4743 | ||
4744 | if not Debug_Flag_Dot_K then | |
4745 | ||
4746 | -- Do not emit warning if this is a predefined unit which is not | |
4747 | -- the main unit. With validity checks enabled, some predefined | |
4748 | -- subprograms may contain nested subprograms and become ineligible | |
4749 | -- for inlining. | |
4750 | ||
4751 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
4752 | and then not In_Extended_Main_Source_Unit (Subp) | |
4753 | then | |
4754 | null; | |
4755 | ||
4756 | elsif Has_Pragma_Inline_Always (Subp) then | |
4757 | ||
4758 | -- Remove last character (question mark) to make this into an | |
4759 | -- error, because the Inline_Always pragma cannot be obeyed. | |
4760 | ||
4761 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); | |
4762 | ||
4763 | elsif Ineffective_Inline_Warnings then | |
dbfeb4fa | 4764 | Error_Msg_NE (Msg & "p?", N, Subp); |
84f4072a JM |
4765 | end if; |
4766 | ||
4767 | return; | |
fbf5a39b | 4768 | |
84f4072a | 4769 | -- New semantics |
e895b435 | 4770 | |
84f4072a JM |
4771 | elsif Is_Serious then |
4772 | ||
4773 | -- Remove last character (question mark) to make this into an error. | |
e895b435 | 4774 | |
ec4867fa | 4775 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); |
fbf5a39b | 4776 | |
84f4072a JM |
4777 | elsif Optimization_Level = 0 then |
4778 | ||
4779 | -- Do not emit warning if this is a predefined unit which is not | |
4780 | -- the main unit. This behavior is currently provided for backward | |
4781 | -- compatibility but it will be removed when we enforce the | |
4782 | -- strictness of the new rules. | |
4783 | ||
4784 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
4785 | and then not In_Extended_Main_Source_Unit (Subp) | |
4786 | then | |
4787 | null; | |
4788 | ||
4789 | elsif Has_Pragma_Inline_Always (Subp) then | |
4790 | ||
4791 | -- Emit a warning if this is a call to a runtime subprogram | |
4792 | -- which is located inside a generic. Previously this call | |
a90bd866 | 4793 | -- was silently skipped. |
84f4072a JM |
4794 | |
4795 | if Is_Generic_Instance (Subp) then | |
4796 | declare | |
4797 | Gen_P : constant Entity_Id := Generic_Parent (Parent (Subp)); | |
4798 | begin | |
4799 | if Is_Predefined_File_Name | |
4800 | (Unit_File_Name (Get_Source_Unit (Gen_P))) | |
4801 | then | |
4802 | Set_Is_Inlined (Subp, False); | |
dbfeb4fa | 4803 | Error_Msg_NE (Msg & "p?", N, Subp); |
84f4072a JM |
4804 | return; |
4805 | end if; | |
4806 | end; | |
4807 | end if; | |
4808 | ||
4809 | -- Remove last character (question mark) to make this into an | |
4810 | -- error, because the Inline_Always pragma cannot be obeyed. | |
4811 | ||
4812 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); | |
4813 | ||
4814 | else pragma Assert (Front_End_Inlining); | |
4815 | Set_Is_Inlined (Subp, False); | |
4816 | ||
4817 | -- When inlining cannot take place we must issue an error. | |
4818 | -- For backward compatibility we still report a warning. | |
4819 | ||
4820 | if Ineffective_Inline_Warnings then | |
dbfeb4fa | 4821 | Error_Msg_NE (Msg & "p?", N, Subp); |
84f4072a JM |
4822 | end if; |
4823 | end if; | |
4824 | ||
4825 | -- Compiling with optimizations enabled it is too early to report | |
4826 | -- problems since the backend may still perform inlining. In order | |
4827 | -- to report unhandled inlinings the program must be compiled with | |
4828 | -- -Winline and the error is reported by the backend. | |
4829 | ||
4830 | else | |
4831 | null; | |
fbf5a39b AC |
4832 | end if; |
4833 | end Cannot_Inline; | |
4834 | ||
84f4072a JM |
4835 | ------------------------------------ |
4836 | -- Check_And_Build_Body_To_Inline -- | |
4837 | ------------------------------------ | |
4838 | ||
4839 | procedure Check_And_Build_Body_To_Inline | |
4840 | (N : Node_Id; | |
4841 | Spec_Id : Entity_Id; | |
4842 | Body_Id : Entity_Id) | |
4843 | is | |
4844 | procedure Build_Body_To_Inline (N : Node_Id; Spec_Id : Entity_Id); | |
4845 | -- Use generic machinery to build an unexpanded body for the subprogram. | |
4846 | -- This body is subsequently used for inline expansions at call sites. | |
4847 | ||
4848 | function Can_Split_Unconstrained_Function (N : Node_Id) return Boolean; | |
088c2c8d AC |
4849 | -- Return true if we generate code for the function body N, the function |
4850 | -- body N has no local declarations and its unique statement is a single | |
4851 | -- extended return statement with a handled statements sequence. | |
84f4072a JM |
4852 | |
4853 | function Check_Body_To_Inline | |
4854 | (N : Node_Id; | |
4855 | Subp : Entity_Id) return Boolean; | |
4856 | -- N is the N_Subprogram_Body of Subp. Return true if Subp can be | |
4857 | -- inlined by the frontend. These are the rules: | |
4858 | -- * At -O0 use fe inlining when inline_always is specified except if | |
4859 | -- the function returns a controlled type. | |
4860 | -- * At other optimization levels use the fe inlining for both inline | |
4861 | -- and inline_always in the following cases: | |
4862 | -- - function returning a known at compile time constant | |
4863 | -- - function returning a call to an intrinsic function | |
4864 | -- - function returning an unconstrained type (see Can_Split | |
4865 | -- Unconstrained_Function). | |
4866 | -- - function returning a call to a frontend-inlined function | |
4867 | -- Use the back-end mechanism otherwise | |
4868 | -- | |
4869 | -- In addition, in the following cases the function cannot be inlined by | |
4870 | -- the frontend: | |
4871 | -- - functions that uses the secondary stack | |
4872 | -- - functions that have declarations of: | |
4873 | -- - Concurrent types | |
4874 | -- - Packages | |
4875 | -- - Instantiations | |
4876 | -- - Subprograms | |
4877 | -- - functions that have some of the following statements: | |
4878 | -- - abort | |
4879 | -- - asynchronous-select | |
4880 | -- - conditional-entry-call | |
4881 | -- - delay-relative | |
4882 | -- - delay-until | |
4883 | -- - selective-accept | |
4884 | -- - timed-entry-call | |
4885 | -- - functions that have exception handlers | |
4886 | -- - functions that have some enclosing body containing instantiations | |
4887 | -- that appear before the corresponding generic body. | |
4888 | ||
4889 | procedure Generate_Body_To_Inline | |
4890 | (N : Node_Id; | |
4891 | Body_To_Inline : out Node_Id); | |
4892 | -- Generate a parameterless duplicate of subprogram body N. Occurrences | |
4893 | -- of pragmas referencing the formals are removed since they have no | |
4894 | -- meaning when the body is inlined and the formals are rewritten (the | |
4895 | -- analysis of the non-inlined body will handle these pragmas properly). | |
4896 | -- A new internal name is associated with Body_To_Inline. | |
4897 | ||
84f4072a JM |
4898 | procedure Split_Unconstrained_Function |
4899 | (N : Node_Id; | |
4900 | Spec_Id : Entity_Id); | |
4901 | -- N is an inlined function body that returns an unconstrained type and | |
4902 | -- has a single extended return statement. Split N in two subprograms: | |
4903 | -- a procedure P' and a function F'. The formals of P' duplicate the | |
4904 | -- formals of N plus an extra formal which is used return a value; | |
4905 | -- its body is composed by the declarations and list of statements | |
4906 | -- of the extended return statement of N. | |
4907 | ||
4908 | -------------------------- | |
4909 | -- Build_Body_To_Inline -- | |
4910 | -------------------------- | |
4911 | ||
4912 | procedure Build_Body_To_Inline (N : Node_Id; Spec_Id : Entity_Id) is | |
4913 | Decl : constant Node_Id := Unit_Declaration_Node (Spec_Id); | |
4914 | Original_Body : Node_Id; | |
4915 | Body_To_Analyze : Node_Id; | |
4916 | ||
4917 | begin | |
4918 | pragma Assert (Current_Scope = Spec_Id); | |
4919 | ||
4920 | -- Within an instance, the body to inline must be treated as a nested | |
4921 | -- generic, so that the proper global references are preserved. We | |
4922 | -- do not do this at the library level, because it is not needed, and | |
4923 | -- furthermore this causes trouble if front end inlining is activated | |
4924 | -- (-gnatN). | |
4925 | ||
4926 | if In_Instance | |
4927 | and then Scope (Current_Scope) /= Standard_Standard | |
4928 | then | |
4929 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); | |
4930 | end if; | |
4931 | ||
4932 | -- We need to capture references to the formals in order | |
4933 | -- to substitute the actuals at the point of inlining, i.e. | |
4934 | -- instantiation. To treat the formals as globals to the body to | |
4935 | -- inline, we nest it within a dummy parameterless subprogram, | |
4936 | -- declared within the real one. | |
4937 | ||
4938 | Generate_Body_To_Inline (N, Original_Body); | |
4939 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); | |
4940 | ||
4941 | -- Set return type of function, which is also global and does not | |
4942 | -- need to be resolved. | |
4943 | ||
4944 | if Ekind (Spec_Id) = E_Function then | |
4945 | Set_Result_Definition (Specification (Body_To_Analyze), | |
4946 | New_Occurrence_Of (Etype (Spec_Id), Sloc (N))); | |
4947 | end if; | |
4948 | ||
4949 | if No (Declarations (N)) then | |
4950 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
4951 | else | |
4952 | Append_To (Declarations (N), Body_To_Analyze); | |
4953 | end if; | |
4954 | ||
4955 | Preanalyze (Body_To_Analyze); | |
4956 | ||
4957 | Push_Scope (Defining_Entity (Body_To_Analyze)); | |
4958 | Save_Global_References (Original_Body); | |
4959 | End_Scope; | |
4960 | Remove (Body_To_Analyze); | |
4961 | ||
4962 | -- Restore environment if previously saved | |
4963 | ||
4964 | if In_Instance | |
4965 | and then Scope (Current_Scope) /= Standard_Standard | |
4966 | then | |
4967 | Restore_Env; | |
4968 | end if; | |
4969 | ||
4970 | pragma Assert (No (Body_To_Inline (Decl))); | |
4971 | Set_Body_To_Inline (Decl, Original_Body); | |
4972 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Spec_Id)); | |
4973 | end Build_Body_To_Inline; | |
4974 | ||
4975 | -------------------------- | |
4976 | -- Check_Body_To_Inline -- | |
4977 | -------------------------- | |
4978 | ||
4979 | function Check_Body_To_Inline | |
4980 | (N : Node_Id; | |
4981 | Subp : Entity_Id) return Boolean | |
4982 | is | |
4983 | Max_Size : constant := 10; | |
4984 | Stat_Count : Integer := 0; | |
4985 | ||
4986 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
4987 | -- Check for declarations that make inlining not worthwhile | |
4988 | ||
4989 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
4990 | -- Check for statements that make inlining not worthwhile: any | |
4991 | -- tasking statement, nested at any level. Keep track of total | |
4992 | -- number of elementary statements, as a measure of acceptable size. | |
4993 | ||
4994 | function Has_Pending_Instantiation return Boolean; | |
4995 | -- Return True if some enclosing body contains instantiations that | |
4996 | -- appear before the corresponding generic body. | |
4997 | ||
4998 | function Returns_Compile_Time_Constant (N : Node_Id) return Boolean; | |
4999 | -- Return True if all the return statements of the function body N | |
5000 | -- are simple return statements and return a compile time constant | |
5001 | ||
5002 | function Returns_Intrinsic_Function_Call (N : Node_Id) return Boolean; | |
5003 | -- Return True if all the return statements of the function body N | |
5004 | -- are simple return statements and return an intrinsic function call | |
5005 | ||
5006 | function Uses_Secondary_Stack (N : Node_Id) return Boolean; | |
5007 | -- If the body of the subprogram includes a call that returns an | |
5008 | -- unconstrained type, the secondary stack is involved, and it | |
5009 | -- is not worth inlining. | |
5010 | ||
5011 | ------------------------------ | |
5012 | -- Has_Excluded_Declaration -- | |
5013 | ------------------------------ | |
5014 | ||
5015 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
5016 | D : Node_Id; | |
5017 | ||
5018 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; | |
5019 | -- Nested subprograms make a given body ineligible for inlining, | |
5020 | -- but we make an exception for instantiations of unchecked | |
5021 | -- conversion. The body has not been analyzed yet, so check the | |
5022 | -- name, and verify that the visible entity with that name is the | |
5023 | -- predefined unit. | |
5024 | ||
5025 | ----------------------------- | |
5026 | -- Is_Unchecked_Conversion -- | |
5027 | ----------------------------- | |
5028 | ||
5029 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
5030 | Id : constant Node_Id := Name (D); | |
5031 | Conv : Entity_Id; | |
5032 | ||
5033 | begin | |
5034 | if Nkind (Id) = N_Identifier | |
5035 | and then Chars (Id) = Name_Unchecked_Conversion | |
5036 | then | |
5037 | Conv := Current_Entity (Id); | |
5038 | ||
5039 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) | |
b69cd36a AC |
5040 | and then |
5041 | Chars (Selector_Name (Id)) = Name_Unchecked_Conversion | |
84f4072a JM |
5042 | then |
5043 | Conv := Current_Entity (Selector_Name (Id)); | |
5044 | else | |
5045 | return False; | |
5046 | end if; | |
5047 | ||
5048 | return Present (Conv) | |
5049 | and then Is_Predefined_File_Name | |
5050 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
5051 | and then Is_Intrinsic_Subprogram (Conv); | |
5052 | end Is_Unchecked_Conversion; | |
5053 | ||
5054 | -- Start of processing for Has_Excluded_Declaration | |
5055 | ||
5056 | begin | |
5057 | D := First (Decls); | |
5058 | while Present (D) loop | |
5059 | if (Nkind (D) = N_Function_Instantiation | |
5060 | and then not Is_Unchecked_Conversion (D)) | |
5061 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
5062 | N_Package_Declaration, | |
5063 | N_Package_Instantiation, | |
5064 | N_Subprogram_Body, | |
5065 | N_Procedure_Instantiation, | |
5066 | N_Task_Type_Declaration) | |
5067 | then | |
5068 | Cannot_Inline | |
5069 | ("cannot inline & (non-allowed declaration)?", D, Subp); | |
5070 | ||
5071 | return True; | |
5072 | end if; | |
5073 | ||
5074 | Next (D); | |
5075 | end loop; | |
5076 | ||
5077 | return False; | |
5078 | end Has_Excluded_Declaration; | |
5079 | ||
5080 | ---------------------------- | |
5081 | -- Has_Excluded_Statement -- | |
5082 | ---------------------------- | |
5083 | ||
5084 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
5085 | S : Node_Id; | |
5086 | E : Node_Id; | |
5087 | ||
5088 | begin | |
5089 | S := First (Stats); | |
5090 | while Present (S) loop | |
5091 | Stat_Count := Stat_Count + 1; | |
5092 | ||
5093 | if Nkind_In (S, N_Abort_Statement, | |
5094 | N_Asynchronous_Select, | |
5095 | N_Conditional_Entry_Call, | |
5096 | N_Delay_Relative_Statement, | |
5097 | N_Delay_Until_Statement, | |
5098 | N_Selective_Accept, | |
5099 | N_Timed_Entry_Call) | |
5100 | then | |
5101 | Cannot_Inline | |
5102 | ("cannot inline & (non-allowed statement)?", S, Subp); | |
5103 | return True; | |
5104 | ||
5105 | elsif Nkind (S) = N_Block_Statement then | |
5106 | if Present (Declarations (S)) | |
5107 | and then Has_Excluded_Declaration (Declarations (S)) | |
5108 | then | |
5109 | return True; | |
5110 | ||
5111 | elsif Present (Handled_Statement_Sequence (S)) then | |
5112 | if Present | |
5113 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
5114 | then | |
5115 | Cannot_Inline | |
5116 | ("cannot inline& (exception handler)?", | |
5117 | First (Exception_Handlers | |
5118 | (Handled_Statement_Sequence (S))), | |
5119 | Subp); | |
5120 | return True; | |
5121 | ||
5122 | elsif Has_Excluded_Statement | |
5123 | (Statements (Handled_Statement_Sequence (S))) | |
5124 | then | |
5125 | return True; | |
5126 | end if; | |
5127 | end if; | |
5128 | ||
5129 | elsif Nkind (S) = N_Case_Statement then | |
5130 | E := First (Alternatives (S)); | |
5131 | while Present (E) loop | |
5132 | if Has_Excluded_Statement (Statements (E)) then | |
5133 | return True; | |
5134 | end if; | |
5135 | ||
5136 | Next (E); | |
5137 | end loop; | |
5138 | ||
5139 | elsif Nkind (S) = N_If_Statement then | |
5140 | if Has_Excluded_Statement (Then_Statements (S)) then | |
5141 | return True; | |
5142 | end if; | |
5143 | ||
5144 | if Present (Elsif_Parts (S)) then | |
5145 | E := First (Elsif_Parts (S)); | |
5146 | while Present (E) loop | |
5147 | if Has_Excluded_Statement (Then_Statements (E)) then | |
5148 | return True; | |
5149 | end if; | |
5150 | Next (E); | |
5151 | end loop; | |
5152 | end if; | |
5153 | ||
5154 | if Present (Else_Statements (S)) | |
5155 | and then Has_Excluded_Statement (Else_Statements (S)) | |
5156 | then | |
5157 | return True; | |
5158 | end if; | |
5159 | ||
5160 | elsif Nkind (S) = N_Loop_Statement | |
5161 | and then Has_Excluded_Statement (Statements (S)) | |
5162 | then | |
5163 | return True; | |
5164 | ||
5165 | elsif Nkind (S) = N_Extended_Return_Statement then | |
5166 | if Present (Handled_Statement_Sequence (S)) | |
5167 | and then | |
5168 | Has_Excluded_Statement | |
5169 | (Statements (Handled_Statement_Sequence (S))) | |
5170 | then | |
5171 | return True; | |
5172 | ||
5173 | elsif Present (Handled_Statement_Sequence (S)) | |
5174 | and then | |
5175 | Present (Exception_Handlers | |
5176 | (Handled_Statement_Sequence (S))) | |
5177 | then | |
5178 | Cannot_Inline | |
5179 | ("cannot inline& (exception handler)?", | |
5180 | First (Exception_Handlers | |
5181 | (Handled_Statement_Sequence (S))), | |
5182 | Subp); | |
5183 | return True; | |
5184 | end if; | |
5185 | end if; | |
5186 | ||
5187 | Next (S); | |
5188 | end loop; | |
5189 | ||
5190 | return False; | |
5191 | end Has_Excluded_Statement; | |
5192 | ||
5193 | ------------------------------- | |
5194 | -- Has_Pending_Instantiation -- | |
5195 | ------------------------------- | |
5196 | ||
5197 | function Has_Pending_Instantiation return Boolean is | |
5198 | S : Entity_Id; | |
5199 | ||
5200 | begin | |
5201 | S := Current_Scope; | |
5202 | while Present (S) loop | |
5203 | if Is_Compilation_Unit (S) | |
5204 | or else Is_Child_Unit (S) | |
5205 | then | |
5206 | return False; | |
5207 | ||
5208 | elsif Ekind (S) = E_Package | |
5209 | and then Has_Forward_Instantiation (S) | |
5210 | then | |
5211 | return True; | |
5212 | end if; | |
5213 | ||
5214 | S := Scope (S); | |
5215 | end loop; | |
5216 | ||
5217 | return False; | |
5218 | end Has_Pending_Instantiation; | |
5219 | ||
5220 | ------------------------------------ | |
5221 | -- Returns_Compile_Time_Constant -- | |
5222 | ------------------------------------ | |
5223 | ||
5224 | function Returns_Compile_Time_Constant (N : Node_Id) return Boolean is | |
5225 | ||
5226 | function Check_Return (N : Node_Id) return Traverse_Result; | |
5227 | ||
5228 | ------------------ | |
5229 | -- Check_Return -- | |
5230 | ------------------ | |
5231 | ||
5232 | function Check_Return (N : Node_Id) return Traverse_Result is | |
5233 | begin | |
5234 | if Nkind (N) = N_Extended_Return_Statement then | |
5235 | return Abandon; | |
5236 | ||
5237 | elsif Nkind (N) = N_Simple_Return_Statement then | |
5238 | if Present (Expression (N)) then | |
5239 | declare | |
5240 | Orig_Expr : constant Node_Id := | |
5241 | Original_Node (Expression (N)); | |
5242 | ||
5243 | begin | |
5244 | if Nkind_In (Orig_Expr, N_Integer_Literal, | |
5245 | N_Real_Literal, | |
5246 | N_Character_Literal) | |
5247 | then | |
5248 | return OK; | |
5249 | ||
5250 | elsif Is_Entity_Name (Orig_Expr) | |
5251 | and then Ekind (Entity (Orig_Expr)) = E_Constant | |
edab6088 | 5252 | and then Is_OK_Static_Expression (Orig_Expr) |
84f4072a JM |
5253 | then |
5254 | return OK; | |
5255 | else | |
5256 | return Abandon; | |
5257 | end if; | |
5258 | end; | |
5259 | ||
5260 | -- Expression has wrong form | |
5261 | ||
5262 | else | |
5263 | return Abandon; | |
5264 | end if; | |
5265 | ||
5266 | -- Continue analyzing statements | |
5267 | ||
5268 | else | |
5269 | return OK; | |
5270 | end if; | |
5271 | end Check_Return; | |
5272 | ||
5273 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
5274 | ||
5275 | -- Start of processing for Returns_Compile_Time_Constant | |
5276 | ||
5277 | begin | |
5278 | return Check_All_Returns (N) = OK; | |
5279 | end Returns_Compile_Time_Constant; | |
5280 | ||
5281 | -------------------------------------- | |
5282 | -- Returns_Intrinsic_Function_Call -- | |
5283 | -------------------------------------- | |
5284 | ||
5285 | function Returns_Intrinsic_Function_Call | |
5286 | (N : Node_Id) return Boolean | |
5287 | is | |
5288 | function Check_Return (N : Node_Id) return Traverse_Result; | |
5289 | ||
5290 | ------------------ | |
5291 | -- Check_Return -- | |
5292 | ------------------ | |
5293 | ||
5294 | function Check_Return (N : Node_Id) return Traverse_Result is | |
5295 | begin | |
5296 | if Nkind (N) = N_Extended_Return_Statement then | |
5297 | return Abandon; | |
5298 | ||
5299 | elsif Nkind (N) = N_Simple_Return_Statement then | |
5300 | if Present (Expression (N)) then | |
5301 | declare | |
5302 | Orig_Expr : constant Node_Id := | |
5303 | Original_Node (Expression (N)); | |
5304 | ||
5305 | begin | |
5306 | if Nkind (Orig_Expr) in N_Op | |
5307 | and then Is_Intrinsic_Subprogram (Entity (Orig_Expr)) | |
5308 | then | |
5309 | return OK; | |
5310 | ||
5311 | elsif Nkind (Orig_Expr) in N_Has_Entity | |
5312 | and then Present (Entity (Orig_Expr)) | |
5313 | and then Ekind (Entity (Orig_Expr)) = E_Function | |
5314 | and then Is_Inlined (Entity (Orig_Expr)) | |
5315 | then | |
5316 | return OK; | |
5317 | ||
5318 | elsif Nkind (Orig_Expr) in N_Has_Entity | |
5319 | and then Present (Entity (Orig_Expr)) | |
5320 | and then Is_Intrinsic_Subprogram (Entity (Orig_Expr)) | |
5321 | then | |
5322 | return OK; | |
5323 | ||
5324 | else | |
5325 | return Abandon; | |
5326 | end if; | |
5327 | end; | |
5328 | ||
5329 | -- Expression has wrong form | |
5330 | ||
5331 | else | |
5332 | return Abandon; | |
5333 | end if; | |
5334 | ||
5335 | -- Continue analyzing statements | |
5336 | ||
5337 | else | |
5338 | return OK; | |
5339 | end if; | |
5340 | end Check_Return; | |
5341 | ||
5342 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
5343 | ||
5344 | -- Start of processing for Returns_Intrinsic_Function_Call | |
5345 | ||
5346 | begin | |
5347 | return Check_All_Returns (N) = OK; | |
5348 | end Returns_Intrinsic_Function_Call; | |
5349 | ||
5350 | -------------------------- | |
5351 | -- Uses_Secondary_Stack -- | |
5352 | -------------------------- | |
5353 | ||
5354 | function Uses_Secondary_Stack (N : Node_Id) return Boolean is | |
5355 | ||
5356 | function Check_Call (N : Node_Id) return Traverse_Result; | |
5357 | -- Look for function calls that return an unconstrained type | |
5358 | ||
5359 | ---------------- | |
5360 | -- Check_Call -- | |
5361 | ---------------- | |
5362 | ||
5363 | function Check_Call (N : Node_Id) return Traverse_Result is | |
5364 | begin | |
5365 | if Nkind (N) = N_Function_Call | |
5366 | and then Is_Entity_Name (Name (N)) | |
5367 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
5368 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
5369 | then | |
5370 | Cannot_Inline | |
5371 | ("cannot inline & (call returns unconstrained type)?", | |
5372 | N, Subp); | |
5373 | ||
5374 | return Abandon; | |
5375 | else | |
5376 | return OK; | |
5377 | end if; | |
5378 | end Check_Call; | |
5379 | ||
5380 | function Check_Calls is new Traverse_Func (Check_Call); | |
5381 | ||
5382 | -- Start of processing for Uses_Secondary_Stack | |
5383 | ||
5384 | begin | |
5385 | return Check_Calls (N) = Abandon; | |
5386 | end Uses_Secondary_Stack; | |
5387 | ||
5388 | -- Local variables | |
5389 | ||
5390 | Decl : constant Node_Id := Unit_Declaration_Node (Spec_Id); | |
5391 | May_Inline : constant Boolean := | |
5392 | Has_Pragma_Inline_Always (Spec_Id) | |
5393 | or else (Has_Pragma_Inline (Spec_Id) | |
8fde064e AC |
5394 | and then ((Optimization_Level > 0 |
5395 | and then Ekind (Spec_Id) | |
84f4072a JM |
5396 | = E_Function) |
5397 | or else Front_End_Inlining)); | |
5398 | Body_To_Analyze : Node_Id; | |
5399 | ||
5400 | -- Start of processing for Check_Body_To_Inline | |
5401 | ||
5402 | begin | |
5403 | -- No action needed in stubs since the attribute Body_To_Inline | |
5404 | -- is not available | |
5405 | ||
5406 | if Nkind (Decl) = N_Subprogram_Body_Stub then | |
5407 | return False; | |
5408 | ||
5409 | -- Cannot build the body to inline if the attribute is already set. | |
5410 | -- This attribute may have been set if this is a subprogram renaming | |
5411 | -- declarations (see Freeze.Build_Renamed_Body). | |
5412 | ||
5413 | elsif Present (Body_To_Inline (Decl)) then | |
5414 | return False; | |
5415 | ||
5416 | -- No action needed if the subprogram does not fulfill the minimum | |
5417 | -- conditions to be inlined by the frontend | |
5418 | ||
5419 | elsif not May_Inline then | |
5420 | return False; | |
5421 | end if; | |
5422 | ||
5423 | -- Check excluded declarations | |
5424 | ||
5425 | if Present (Declarations (N)) | |
5426 | and then Has_Excluded_Declaration (Declarations (N)) | |
5427 | then | |
5428 | return False; | |
5429 | end if; | |
5430 | ||
5431 | -- Check excluded statements | |
5432 | ||
5433 | if Present (Handled_Statement_Sequence (N)) then | |
5434 | if Present | |
5435 | (Exception_Handlers (Handled_Statement_Sequence (N))) | |
5436 | then | |
5437 | Cannot_Inline | |
5438 | ("cannot inline& (exception handler)?", | |
5439 | First | |
5440 | (Exception_Handlers (Handled_Statement_Sequence (N))), | |
5441 | Subp); | |
5442 | ||
5443 | return False; | |
5444 | ||
5445 | elsif Has_Excluded_Statement | |
5446 | (Statements (Handled_Statement_Sequence (N))) | |
5447 | then | |
5448 | return False; | |
5449 | end if; | |
5450 | end if; | |
5451 | ||
5452 | -- For backward compatibility, compiling under -gnatN we do not | |
5453 | -- inline a subprogram that is too large, unless it is marked | |
5454 | -- Inline_Always. This pragma does not suppress the other checks | |
5455 | -- on inlining (forbidden declarations, handlers, etc). | |
5456 | ||
5457 | if Front_End_Inlining | |
5458 | and then not Has_Pragma_Inline_Always (Subp) | |
5459 | and then Stat_Count > Max_Size | |
5460 | then | |
5461 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); | |
5462 | return False; | |
5463 | end if; | |
5464 | ||
5465 | -- If some enclosing body contains instantiations that appear before | |
5466 | -- the corresponding generic body, the enclosing body has a freeze | |
5467 | -- node so that it can be elaborated after the generic itself. This | |
5468 | -- might conflict with subsequent inlinings, so that it is unsafe to | |
5469 | -- try to inline in such a case. | |
5470 | ||
5471 | if Has_Pending_Instantiation then | |
5472 | Cannot_Inline | |
5473 | ("cannot inline& (forward instance within enclosing body)?", | |
5474 | N, Subp); | |
5475 | ||
5476 | return False; | |
5477 | end if; | |
5478 | ||
5479 | -- Generate and preanalyze the body to inline (needed to perform | |
5480 | -- the rest of the checks) | |
5481 | ||
5482 | Generate_Body_To_Inline (N, Body_To_Analyze); | |
5483 | ||
5484 | if Ekind (Subp) = E_Function then | |
5485 | Set_Result_Definition (Specification (Body_To_Analyze), | |
5486 | New_Occurrence_Of (Etype (Subp), Sloc (N))); | |
5487 | end if; | |
5488 | ||
5489 | -- Nest the body to analyze within the real one | |
5490 | ||
5491 | if No (Declarations (N)) then | |
5492 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
5493 | else | |
5494 | Append_To (Declarations (N), Body_To_Analyze); | |
5495 | end if; | |
5496 | ||
5497 | Preanalyze (Body_To_Analyze); | |
5498 | Remove (Body_To_Analyze); | |
5499 | ||
5500 | -- Keep separate checks needed when compiling without optimizations | |
5501 | ||
ea3a4ad0 | 5502 | if Optimization_Level = 0 |
a1fc903a AC |
5503 | |
5504 | -- AAMP and VM targets have no support for inlining in the backend | |
5505 | -- and hence we use frontend inlining at all optimization levels. | |
5506 | ||
ea3a4ad0 JM |
5507 | or else AAMP_On_Target |
5508 | or else VM_Target /= No_VM | |
5509 | then | |
84f4072a JM |
5510 | -- Cannot inline functions whose body has a call that returns an |
5511 | -- unconstrained type since the secondary stack is involved, and | |
5512 | -- it is not worth inlining. | |
5513 | ||
5514 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
5515 | return False; | |
5516 | ||
5517 | -- Cannot inline functions that return controlled types since | |
5518 | -- controlled actions interfere in complex ways with inlining. | |
5519 | ||
5520 | elsif Ekind (Subp) = E_Function | |
5521 | and then Needs_Finalization (Etype (Subp)) | |
5522 | then | |
5523 | Cannot_Inline | |
5524 | ("cannot inline & (controlled return type)?", N, Subp); | |
5525 | return False; | |
5526 | ||
5527 | elsif Returns_Unconstrained_Type (Subp) then | |
5528 | Cannot_Inline | |
5529 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
5530 | return False; | |
5531 | end if; | |
5532 | ||
5533 | -- Compiling with optimizations enabled | |
5534 | ||
5535 | else | |
a90bd866 | 5536 | -- Procedures are never frontend inlined in this case |
84f4072a JM |
5537 | |
5538 | if Ekind (Subp) /= E_Function then | |
5539 | return False; | |
5540 | ||
5541 | -- Functions returning unconstrained types are tested | |
5542 | -- separately (see Can_Split_Unconstrained_Function). | |
5543 | ||
5544 | elsif Returns_Unconstrained_Type (Subp) then | |
5545 | null; | |
5546 | ||
5547 | -- Check supported cases | |
5548 | ||
5549 | elsif not Returns_Compile_Time_Constant (Body_To_Analyze) | |
5550 | and then Convention (Subp) /= Convention_Intrinsic | |
5551 | and then not Returns_Intrinsic_Function_Call (Body_To_Analyze) | |
5552 | then | |
5553 | return False; | |
5554 | end if; | |
5555 | end if; | |
5556 | ||
5557 | return True; | |
5558 | end Check_Body_To_Inline; | |
5559 | ||
5560 | -------------------------------------- | |
5561 | -- Can_Split_Unconstrained_Function -- | |
5562 | -------------------------------------- | |
5563 | ||
5564 | function Can_Split_Unconstrained_Function (N : Node_Id) return Boolean | |
5565 | is | |
5566 | Ret_Node : constant Node_Id := | |
5567 | First (Statements (Handled_Statement_Sequence (N))); | |
5568 | D : Node_Id; | |
5569 | ||
5570 | begin | |
5571 | -- No user defined declarations allowed in the function except inside | |
5572 | -- the unique return statement; implicit labels are the only allowed | |
5573 | -- declarations. | |
5574 | ||
5575 | if not Is_Empty_List (Declarations (N)) then | |
5576 | D := First (Declarations (N)); | |
5577 | while Present (D) loop | |
5578 | if Nkind (D) /= N_Implicit_Label_Declaration then | |
5579 | return False; | |
5580 | end if; | |
5581 | ||
5582 | Next (D); | |
5583 | end loop; | |
5584 | end if; | |
5585 | ||
088c2c8d AC |
5586 | -- We only split the inlined function when we are generating the code |
5587 | -- of its body; otherwise we leave duplicated split subprograms in | |
5588 | -- the tree which (if referenced) generate wrong references at link | |
5589 | -- time. | |
5590 | ||
5591 | return In_Extended_Main_Code_Unit (N) | |
5592 | and then Present (Ret_Node) | |
84f4072a JM |
5593 | and then Nkind (Ret_Node) = N_Extended_Return_Statement |
5594 | and then No (Next (Ret_Node)) | |
5595 | and then Present (Handled_Statement_Sequence (Ret_Node)); | |
5596 | end Can_Split_Unconstrained_Function; | |
5597 | ||
5598 | ----------------------------- | |
5599 | -- Generate_Body_To_Inline -- | |
5600 | ----------------------------- | |
5601 | ||
5602 | procedure Generate_Body_To_Inline | |
5603 | (N : Node_Id; | |
5604 | Body_To_Inline : out Node_Id) | |
5605 | is | |
5606 | procedure Remove_Pragmas (N : Node_Id); | |
5607 | -- Remove occurrences of pragmas that may reference the formals of | |
5608 | -- N. The analysis of the non-inlined body will handle these pragmas | |
5609 | -- properly. | |
5610 | ||
5611 | -------------------- | |
5612 | -- Remove_Pragmas -- | |
5613 | -------------------- | |
5614 | ||
5615 | procedure Remove_Pragmas (N : Node_Id) is | |
5616 | Decl : Node_Id; | |
5617 | Nxt : Node_Id; | |
5618 | ||
5619 | begin | |
5620 | Decl := First (Declarations (N)); | |
5621 | while Present (Decl) loop | |
5622 | Nxt := Next (Decl); | |
5623 | ||
5624 | if Nkind (Decl) = N_Pragma | |
b69cd36a AC |
5625 | and then Nam_In (Pragma_Name (Decl), Name_Unreferenced, |
5626 | Name_Unmodified) | |
84f4072a JM |
5627 | then |
5628 | Remove (Decl); | |
5629 | end if; | |
5630 | ||
5631 | Decl := Nxt; | |
5632 | end loop; | |
5633 | end Remove_Pragmas; | |
5634 | ||
5635 | -- Start of processing for Generate_Body_To_Inline | |
5636 | ||
5637 | begin | |
5638 | -- Within an instance, the body to inline must be treated as a nested | |
5639 | -- generic, so that the proper global references are preserved. | |
5640 | ||
5641 | -- Note that we do not do this at the library level, because it | |
5642 | -- is not needed, and furthermore this causes trouble if front | |
5643 | -- end inlining is activated (-gnatN). | |
5644 | ||
5645 | if In_Instance | |
5646 | and then Scope (Current_Scope) /= Standard_Standard | |
5647 | then | |
5648 | Body_To_Inline := Copy_Generic_Node (N, Empty, True); | |
5649 | else | |
5650 | Body_To_Inline := Copy_Separate_Tree (N); | |
5651 | end if; | |
5652 | ||
5653 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal | |
5654 | -- parameter has no meaning when the body is inlined and the formals | |
5655 | -- are rewritten. Remove it from body to inline. The analysis of the | |
5656 | -- non-inlined body will handle the pragma properly. | |
5657 | ||
5658 | Remove_Pragmas (Body_To_Inline); | |
5659 | ||
5660 | -- We need to capture references to the formals in order | |
5661 | -- to substitute the actuals at the point of inlining, i.e. | |
5662 | -- instantiation. To treat the formals as globals to the body to | |
5663 | -- inline, we nest it within a dummy parameterless subprogram, | |
5664 | -- declared within the real one. | |
5665 | ||
5666 | Set_Parameter_Specifications | |
5667 | (Specification (Body_To_Inline), No_List); | |
5668 | ||
5669 | -- A new internal name is associated with Body_To_Inline to avoid | |
5670 | -- conflicts when the non-inlined body N is analyzed. | |
5671 | ||
5672 | Set_Defining_Unit_Name (Specification (Body_To_Inline), | |
5673 | Make_Defining_Identifier (Sloc (N), New_Internal_Name ('P'))); | |
5674 | Set_Corresponding_Spec (Body_To_Inline, Empty); | |
5675 | end Generate_Body_To_Inline; | |
5676 | ||
84f4072a JM |
5677 | ---------------------------------- |
5678 | -- Split_Unconstrained_Function -- | |
5679 | ---------------------------------- | |
5680 | ||
5681 | procedure Split_Unconstrained_Function | |
5682 | (N : Node_Id; | |
5683 | Spec_Id : Entity_Id) | |
5684 | is | |
5685 | Loc : constant Source_Ptr := Sloc (N); | |
5686 | Ret_Node : constant Node_Id := | |
5687 | First (Statements (Handled_Statement_Sequence (N))); | |
5688 | Ret_Obj : constant Node_Id := | |
5689 | First (Return_Object_Declarations (Ret_Node)); | |
5690 | ||
5691 | procedure Build_Procedure | |
5692 | (Proc_Id : out Entity_Id; | |
5693 | Decl_List : out List_Id); | |
5694 | -- Build a procedure containing the statements found in the extended | |
5695 | -- return statement of the unconstrained function body N. | |
5696 | ||
5697 | procedure Build_Procedure | |
5698 | (Proc_Id : out Entity_Id; | |
5699 | Decl_List : out List_Id) | |
5700 | is | |
5701 | Formal : Entity_Id; | |
5702 | Formal_List : constant List_Id := New_List; | |
5703 | Proc_Spec : Node_Id; | |
5704 | Proc_Body : Node_Id; | |
5705 | Subp_Name : constant Name_Id := New_Internal_Name ('F'); | |
5706 | Body_Decl_List : List_Id := No_List; | |
5707 | Param_Type : Node_Id; | |
5708 | ||
5709 | begin | |
5710 | if Nkind (Object_Definition (Ret_Obj)) = N_Identifier then | |
5711 | Param_Type := New_Copy (Object_Definition (Ret_Obj)); | |
5712 | else | |
5713 | Param_Type := | |
5714 | New_Copy (Subtype_Mark (Object_Definition (Ret_Obj))); | |
5715 | end if; | |
5716 | ||
5717 | Append_To (Formal_List, | |
5718 | Make_Parameter_Specification (Loc, | |
5719 | Defining_Identifier => | |
5720 | Make_Defining_Identifier (Loc, | |
5721 | Chars => Chars (Defining_Identifier (Ret_Obj))), | |
5722 | In_Present => False, | |
5723 | Out_Present => True, | |
5724 | Null_Exclusion_Present => False, | |
5725 | Parameter_Type => Param_Type)); | |
5726 | ||
5727 | Formal := First_Formal (Spec_Id); | |
5728 | while Present (Formal) loop | |
5729 | Append_To (Formal_List, | |
5730 | Make_Parameter_Specification (Loc, | |
5731 | Defining_Identifier => | |
5732 | Make_Defining_Identifier (Sloc (Formal), | |
5733 | Chars => Chars (Formal)), | |
5734 | In_Present => In_Present (Parent (Formal)), | |
5735 | Out_Present => Out_Present (Parent (Formal)), | |
5736 | Null_Exclusion_Present => | |
5737 | Null_Exclusion_Present (Parent (Formal)), | |
5738 | Parameter_Type => | |
e4494292 | 5739 | New_Occurrence_Of (Etype (Formal), Loc), |
84f4072a JM |
5740 | Expression => |
5741 | Copy_Separate_Tree (Expression (Parent (Formal))))); | |
5742 | ||
5743 | Next_Formal (Formal); | |
5744 | end loop; | |
5745 | ||
5746 | Proc_Id := | |
5747 | Make_Defining_Identifier (Loc, Chars => Subp_Name); | |
5748 | ||
5749 | Proc_Spec := | |
5750 | Make_Procedure_Specification (Loc, | |
5751 | Defining_Unit_Name => Proc_Id, | |
5752 | Parameter_Specifications => Formal_List); | |
5753 | ||
5754 | Decl_List := New_List; | |
5755 | ||
5756 | Append_To (Decl_List, | |
5757 | Make_Subprogram_Declaration (Loc, Proc_Spec)); | |
5758 | ||
5759 | -- Can_Convert_Unconstrained_Function checked that the function | |
5760 | -- has no local declarations except implicit label declarations. | |
5761 | -- Copy these declarations to the built procedure. | |
5762 | ||
5763 | if Present (Declarations (N)) then | |
5764 | Body_Decl_List := New_List; | |
5765 | ||
5766 | declare | |
5767 | D : Node_Id; | |
5768 | New_D : Node_Id; | |
5769 | ||
5770 | begin | |
5771 | D := First (Declarations (N)); | |
5772 | while Present (D) loop | |
5773 | pragma Assert (Nkind (D) = N_Implicit_Label_Declaration); | |
5774 | ||
5775 | New_D := | |
5776 | Make_Implicit_Label_Declaration (Loc, | |
5777 | Make_Defining_Identifier (Loc, | |
5778 | Chars => Chars (Defining_Identifier (D))), | |
5779 | Label_Construct => Empty); | |
5780 | Append_To (Body_Decl_List, New_D); | |
5781 | ||
5782 | Next (D); | |
5783 | end loop; | |
5784 | end; | |
5785 | end if; | |
5786 | ||
5787 | pragma Assert (Present (Handled_Statement_Sequence (Ret_Node))); | |
5788 | ||
5789 | Proc_Body := | |
5790 | Make_Subprogram_Body (Loc, | |
5791 | Specification => Copy_Separate_Tree (Proc_Spec), | |
5792 | Declarations => Body_Decl_List, | |
5793 | Handled_Statement_Sequence => | |
5794 | Copy_Separate_Tree (Handled_Statement_Sequence (Ret_Node))); | |
5795 | ||
5796 | Set_Defining_Unit_Name (Specification (Proc_Body), | |
5797 | Make_Defining_Identifier (Loc, Subp_Name)); | |
5798 | ||
5799 | Append_To (Decl_List, Proc_Body); | |
5800 | end Build_Procedure; | |
5801 | ||
5802 | -- Local variables | |
5803 | ||
5804 | New_Obj : constant Node_Id := Copy_Separate_Tree (Ret_Obj); | |
5805 | Blk_Stmt : Node_Id; | |
5806 | Proc_Id : Entity_Id; | |
5807 | Proc_Call : Node_Id; | |
5808 | ||
5809 | -- Start of processing for Split_Unconstrained_Function | |
5810 | ||
5811 | begin | |
5812 | -- Build the associated procedure, analyze it and insert it before | |
5813 | -- the function body N | |
5814 | ||
5815 | declare | |
5816 | Scope : constant Entity_Id := Current_Scope; | |
5817 | Decl_List : List_Id; | |
5818 | begin | |
5819 | Pop_Scope; | |
5820 | Build_Procedure (Proc_Id, Decl_List); | |
5821 | Insert_Actions (N, Decl_List); | |
5822 | Push_Scope (Scope); | |
5823 | end; | |
5824 | ||
5825 | -- Build the call to the generated procedure | |
5826 | ||
5827 | declare | |
5828 | Actual_List : constant List_Id := New_List; | |
5829 | Formal : Entity_Id; | |
5830 | ||
5831 | begin | |
5832 | Append_To (Actual_List, | |
e4494292 | 5833 | New_Occurrence_Of (Defining_Identifier (New_Obj), Loc)); |
84f4072a JM |
5834 | |
5835 | Formal := First_Formal (Spec_Id); | |
5836 | while Present (Formal) loop | |
e4494292 | 5837 | Append_To (Actual_List, New_Occurrence_Of (Formal, Loc)); |
84f4072a JM |
5838 | |
5839 | -- Avoid spurious warning on unreferenced formals | |
5840 | ||
5841 | Set_Referenced (Formal); | |
5842 | Next_Formal (Formal); | |
5843 | end loop; | |
5844 | ||
5845 | Proc_Call := | |
5846 | Make_Procedure_Call_Statement (Loc, | |
e4494292 | 5847 | Name => New_Occurrence_Of (Proc_Id, Loc), |
84f4072a JM |
5848 | Parameter_Associations => Actual_List); |
5849 | end; | |
5850 | ||
5851 | -- Generate | |
5852 | ||
5853 | -- declare | |
5854 | -- New_Obj : ... | |
5855 | -- begin | |
5856 | -- main_1__F1b (New_Obj, ...); | |
5857 | -- return Obj; | |
5858 | -- end B10b; | |
5859 | ||
5860 | Blk_Stmt := | |
5861 | Make_Block_Statement (Loc, | |
5862 | Declarations => New_List (New_Obj), | |
5863 | Handled_Statement_Sequence => | |
5864 | Make_Handled_Sequence_Of_Statements (Loc, | |
5865 | Statements => New_List ( | |
5866 | ||
5867 | Proc_Call, | |
5868 | ||
5869 | Make_Simple_Return_Statement (Loc, | |
5870 | Expression => | |
e4494292 | 5871 | New_Occurrence_Of |
84f4072a JM |
5872 | (Defining_Identifier (New_Obj), Loc))))); |
5873 | ||
5874 | Rewrite (Ret_Node, Blk_Stmt); | |
5875 | end Split_Unconstrained_Function; | |
5876 | ||
5877 | -- Start of processing for Check_And_Build_Body_To_Inline | |
5878 | ||
5879 | begin | |
5880 | -- Do not inline any subprogram that contains nested subprograms, since | |
5881 | -- the backend inlining circuit seems to generate uninitialized | |
5882 | -- references in this case. We know this happens in the case of front | |
5883 | -- end ZCX support, but it also appears it can happen in other cases as | |
5884 | -- well. The backend often rejects attempts to inline in the case of | |
5885 | -- nested procedures anyway, so little if anything is lost by this. | |
5886 | -- Note that this is test is for the benefit of the back-end. There is | |
5887 | -- a separate test for front-end inlining that also rejects nested | |
5888 | -- subprograms. | |
5889 | ||
5890 | -- Do not do this test if errors have been detected, because in some | |
5891 | -- error cases, this code blows up, and we don't need it anyway if | |
5892 | -- there have been errors, since we won't get to the linker anyway. | |
5893 | ||
5894 | if Comes_From_Source (Body_Id) | |
5895 | and then (Has_Pragma_Inline_Always (Spec_Id) | |
5896 | or else Optimization_Level > 0) | |
5897 | and then Serious_Errors_Detected = 0 | |
5898 | then | |
5899 | declare | |
5900 | P_Ent : Node_Id; | |
5901 | ||
5902 | begin | |
5903 | P_Ent := Body_Id; | |
5904 | loop | |
5905 | P_Ent := Scope (P_Ent); | |
5906 | exit when No (P_Ent) or else P_Ent = Standard_Standard; | |
5907 | ||
5908 | if Is_Subprogram (P_Ent) then | |
5909 | Set_Is_Inlined (P_Ent, False); | |
5910 | ||
5911 | if Comes_From_Source (P_Ent) | |
5912 | and then Has_Pragma_Inline (P_Ent) | |
5913 | then | |
5914 | Cannot_Inline | |
5915 | ("cannot inline& (nested subprogram)?", N, P_Ent, | |
5916 | Is_Serious => True); | |
5917 | end if; | |
5918 | end if; | |
5919 | end loop; | |
5920 | end; | |
5921 | end if; | |
5922 | ||
a90bd866 | 5923 | -- Build the body to inline only if really needed |
84f4072a JM |
5924 | |
5925 | if Check_Body_To_Inline (N, Spec_Id) | |
5926 | and then Serious_Errors_Detected = 0 | |
5927 | then | |
5928 | if Returns_Unconstrained_Type (Spec_Id) then | |
5929 | if Can_Split_Unconstrained_Function (N) then | |
5930 | Split_Unconstrained_Function (N, Spec_Id); | |
5931 | Build_Body_To_Inline (N, Spec_Id); | |
5932 | Set_Is_Inlined (Spec_Id); | |
5933 | end if; | |
5934 | else | |
5935 | Build_Body_To_Inline (N, Spec_Id); | |
5936 | Set_Is_Inlined (Spec_Id); | |
5937 | end if; | |
5938 | end if; | |
5939 | end Check_And_Build_Body_To_Inline; | |
5940 | ||
996ae0b0 RK |
5941 | ----------------------- |
5942 | -- Check_Conformance -- | |
5943 | ----------------------- | |
5944 | ||
5945 | procedure Check_Conformance | |
41251c60 JM |
5946 | (New_Id : Entity_Id; |
5947 | Old_Id : Entity_Id; | |
5948 | Ctype : Conformance_Type; | |
5949 | Errmsg : Boolean; | |
5950 | Conforms : out Boolean; | |
5951 | Err_Loc : Node_Id := Empty; | |
5952 | Get_Inst : Boolean := False; | |
5953 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 5954 | is |
996ae0b0 | 5955 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
5956 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
5957 | -- If Errmsg is True, then processing continues to post an error message | |
5958 | -- for conformance error on given node. Two messages are output. The | |
5959 | -- first message points to the previous declaration with a general "no | |
5960 | -- conformance" message. The second is the detailed reason, supplied as | |
5961 | -- Msg. The parameter N provide information for a possible & insertion | |
5962 | -- in the message, and also provides the location for posting the | |
5963 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
5964 | |
5965 | ----------------------- | |
5966 | -- Conformance_Error -- | |
5967 | ----------------------- | |
5968 | ||
5969 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
5970 | Enode : Node_Id; | |
5971 | ||
5972 | begin | |
5973 | Conforms := False; | |
5974 | ||
5975 | if Errmsg then | |
5976 | if No (Err_Loc) then | |
5977 | Enode := N; | |
5978 | else | |
5979 | Enode := Err_Loc; | |
5980 | end if; | |
5981 | ||
5982 | Error_Msg_Sloc := Sloc (Old_Id); | |
5983 | ||
5984 | case Ctype is | |
5985 | when Type_Conformant => | |
483c78cb | 5986 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
5987 | ("not type conformant with declaration#!", Enode); |
5988 | ||
5989 | when Mode_Conformant => | |
19590d70 | 5990 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5991 | Error_Msg_N |
19590d70 GD |
5992 | ("not mode conformant with operation inherited#!", |
5993 | Enode); | |
5994 | else | |
ed2233dc | 5995 | Error_Msg_N |
19590d70 GD |
5996 | ("not mode conformant with declaration#!", Enode); |
5997 | end if; | |
996ae0b0 RK |
5998 | |
5999 | when Subtype_Conformant => | |
19590d70 | 6000 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 6001 | Error_Msg_N |
19590d70 GD |
6002 | ("not subtype conformant with operation inherited#!", |
6003 | Enode); | |
6004 | else | |
ed2233dc | 6005 | Error_Msg_N |
19590d70 GD |
6006 | ("not subtype conformant with declaration#!", Enode); |
6007 | end if; | |
996ae0b0 RK |
6008 | |
6009 | when Fully_Conformant => | |
19590d70 | 6010 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 6011 | Error_Msg_N -- CODEFIX |
19590d70 GD |
6012 | ("not fully conformant with operation inherited#!", |
6013 | Enode); | |
6014 | else | |
483c78cb | 6015 | Error_Msg_N -- CODEFIX |
19590d70 GD |
6016 | ("not fully conformant with declaration#!", Enode); |
6017 | end if; | |
996ae0b0 RK |
6018 | end case; |
6019 | ||
6020 | Error_Msg_NE (Msg, Enode, N); | |
6021 | end if; | |
6022 | end Conformance_Error; | |
6023 | ||
ec4867fa ES |
6024 | -- Local Variables |
6025 | ||
6026 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
6027 | New_Type : constant Entity_Id := Etype (New_Id); | |
6028 | Old_Formal : Entity_Id; | |
6029 | New_Formal : Entity_Id; | |
6030 | Access_Types_Match : Boolean; | |
6031 | Old_Formal_Base : Entity_Id; | |
6032 | New_Formal_Base : Entity_Id; | |
6033 | ||
996ae0b0 RK |
6034 | -- Start of processing for Check_Conformance |
6035 | ||
6036 | begin | |
6037 | Conforms := True; | |
6038 | ||
82c80734 RD |
6039 | -- We need a special case for operators, since they don't appear |
6040 | -- explicitly. | |
996ae0b0 RK |
6041 | |
6042 | if Ctype = Type_Conformant then | |
6043 | if Ekind (New_Id) = E_Operator | |
6044 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
6045 | then | |
6046 | return; | |
6047 | end if; | |
6048 | end if; | |
6049 | ||
6050 | -- If both are functions/operators, check return types conform | |
6051 | ||
6052 | if Old_Type /= Standard_Void_Type | |
6053 | and then New_Type /= Standard_Void_Type | |
6054 | then | |
fceeaab6 ES |
6055 | |
6056 | -- If we are checking interface conformance we omit controlling | |
6057 | -- arguments and result, because we are only checking the conformance | |
6058 | -- of the remaining parameters. | |
6059 | ||
6060 | if Has_Controlling_Result (Old_Id) | |
6061 | and then Has_Controlling_Result (New_Id) | |
6062 | and then Skip_Controlling_Formals | |
6063 | then | |
6064 | null; | |
6065 | ||
6066 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
7f568bfa AC |
6067 | if Ctype >= Subtype_Conformant |
6068 | and then not Predicates_Match (Old_Type, New_Type) | |
6069 | then | |
6070 | Conformance_Error | |
6071 | ("\predicate of return type does not match!", New_Id); | |
6072 | else | |
6073 | Conformance_Error | |
6074 | ("\return type does not match!", New_Id); | |
6075 | end if; | |
6076 | ||
996ae0b0 RK |
6077 | return; |
6078 | end if; | |
6079 | ||
41251c60 | 6080 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 6081 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 6082 | |
0791fbe9 | 6083 | if Ada_Version >= Ada_2005 |
41251c60 JM |
6084 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
6085 | and then | |
8fde064e AC |
6086 | (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
6087 | or else Is_Access_Constant (Etype (Old_Type)) /= | |
6088 | Is_Access_Constant (Etype (New_Type))) | |
41251c60 | 6089 | then |
5d37ba92 | 6090 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
6091 | return; |
6092 | end if; | |
6093 | ||
996ae0b0 RK |
6094 | -- If either is a function/operator and the other isn't, error |
6095 | ||
6096 | elsif Old_Type /= Standard_Void_Type | |
6097 | or else New_Type /= Standard_Void_Type | |
6098 | then | |
5d37ba92 | 6099 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
6100 | return; |
6101 | end if; | |
6102 | ||
0a36105d | 6103 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
6104 | -- If this is a renaming as body, refine error message to indicate that |
6105 | -- the conflict is with the original declaration. If the entity is not | |
6106 | -- frozen, the conventions don't have to match, the one of the renamed | |
6107 | -- entity is inherited. | |
6108 | ||
6109 | if Ctype >= Subtype_Conformant then | |
996ae0b0 | 6110 | if Convention (Old_Id) /= Convention (New_Id) then |
996ae0b0 RK |
6111 | if not Is_Frozen (New_Id) then |
6112 | null; | |
6113 | ||
6114 | elsif Present (Err_Loc) | |
6115 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
6116 | and then Present (Corresponding_Spec (Err_Loc)) | |
6117 | then | |
6118 | Error_Msg_Name_1 := Chars (New_Id); | |
6119 | Error_Msg_Name_2 := | |
6120 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 6121 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
6122 | |
6123 | else | |
5d37ba92 | 6124 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
6125 | end if; |
6126 | ||
6127 | return; | |
6128 | ||
6129 | elsif Is_Formal_Subprogram (Old_Id) | |
6130 | or else Is_Formal_Subprogram (New_Id) | |
6131 | then | |
5d37ba92 | 6132 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 RK |
6133 | return; |
6134 | end if; | |
6135 | end if; | |
6136 | ||
6137 | -- Deal with parameters | |
6138 | ||
6139 | -- Note: we use the entity information, rather than going directly | |
6140 | -- to the specification in the tree. This is not only simpler, but | |
6141 | -- absolutely necessary for some cases of conformance tests between | |
a90bd866 | 6142 | -- operators, where the declaration tree simply does not exist. |
996ae0b0 RK |
6143 | |
6144 | Old_Formal := First_Formal (Old_Id); | |
6145 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 6146 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
6147 | if Is_Controlling_Formal (Old_Formal) |
6148 | and then Is_Controlling_Formal (New_Formal) | |
6149 | and then Skip_Controlling_Formals | |
6150 | then | |
a2dc5812 AC |
6151 | -- The controlling formals will have different types when |
6152 | -- comparing an interface operation with its match, but both | |
6153 | -- or neither must be access parameters. | |
6154 | ||
6155 | if Is_Access_Type (Etype (Old_Formal)) | |
6156 | = | |
6157 | Is_Access_Type (Etype (New_Formal)) | |
6158 | then | |
6159 | goto Skip_Controlling_Formal; | |
6160 | else | |
6161 | Conformance_Error | |
6162 | ("\access parameter does not match!", New_Formal); | |
6163 | end if; | |
41251c60 JM |
6164 | end if; |
6165 | ||
21791d97 | 6166 | -- Ada 2012: Mode conformance also requires that formal parameters |
2a290fec AC |
6167 | -- be both aliased, or neither. |
6168 | ||
21791d97 | 6169 | if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
2a290fec AC |
6170 | if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
6171 | Conformance_Error | |
6172 | ("\aliased parameter mismatch!", New_Formal); | |
6173 | end if; | |
6174 | end if; | |
6175 | ||
fbf5a39b AC |
6176 | if Ctype = Fully_Conformant then |
6177 | ||
6178 | -- Names must match. Error message is more accurate if we do | |
6179 | -- this before checking that the types of the formals match. | |
6180 | ||
6181 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
5d37ba92 | 6182 | Conformance_Error ("\name & does not match!", New_Formal); |
fbf5a39b AC |
6183 | |
6184 | -- Set error posted flag on new formal as well to stop | |
6185 | -- junk cascaded messages in some cases. | |
6186 | ||
6187 | Set_Error_Posted (New_Formal); | |
6188 | return; | |
6189 | end if; | |
40b93859 RD |
6190 | |
6191 | -- Null exclusion must match | |
6192 | ||
6193 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
6194 | /= | |
6195 | Null_Exclusion_Present (Parent (New_Formal)) | |
6196 | then | |
6197 | -- Only give error if both come from source. This should be | |
6198 | -- investigated some time, since it should not be needed ??? | |
6199 | ||
6200 | if Comes_From_Source (Old_Formal) | |
6201 | and then | |
6202 | Comes_From_Source (New_Formal) | |
6203 | then | |
6204 | Conformance_Error | |
6205 | ("\null exclusion for & does not match", New_Formal); | |
6206 | ||
6207 | -- Mark error posted on the new formal to avoid duplicated | |
6208 | -- complaint about types not matching. | |
6209 | ||
6210 | Set_Error_Posted (New_Formal); | |
6211 | end if; | |
6212 | end if; | |
fbf5a39b | 6213 | end if; |
996ae0b0 | 6214 | |
ec4867fa ES |
6215 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
6216 | -- case occurs whenever a subprogram is being renamed and one of its | |
6217 | -- parameters imposes a null exclusion. For example: | |
6218 | ||
6219 | -- type T is null record; | |
6220 | -- type Acc_T is access T; | |
6221 | -- subtype Acc_T_Sub is Acc_T; | |
6222 | ||
6223 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
6224 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
6225 | -- renames P; | |
6226 | ||
6227 | Old_Formal_Base := Etype (Old_Formal); | |
6228 | New_Formal_Base := Etype (New_Formal); | |
6229 | ||
6230 | if Get_Inst then | |
6231 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
6232 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
6233 | end if; | |
6234 | ||
0791fbe9 | 6235 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa | 6236 | |
8fde064e AC |
6237 | -- Ensure that this rule is only applied when New_Id is a |
6238 | -- renaming of Old_Id. | |
ec4867fa | 6239 | |
5d37ba92 ES |
6240 | and then Nkind (Parent (Parent (New_Id))) = |
6241 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
6242 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
6243 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
6244 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
6245 | ||
8fde064e | 6246 | -- Now handle the allowed access-type case |
ec4867fa ES |
6247 | |
6248 | and then Is_Access_Type (Old_Formal_Base) | |
6249 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 | 6250 | |
8fde064e AC |
6251 | -- The type kinds must match. The only exception occurs with |
6252 | -- multiple generics of the form: | |
5d37ba92 | 6253 | |
8fde064e AC |
6254 | -- generic generic |
6255 | -- type F is private; type A is private; | |
6256 | -- type F_Ptr is access F; type A_Ptr is access A; | |
6257 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
6258 | -- package F_Pack is ... package A_Pack is | |
6259 | -- package F_Inst is | |
6260 | -- new F_Pack (A, A_Ptr, A_P); | |
5d37ba92 | 6261 | |
8fde064e AC |
6262 | -- When checking for conformance between the parameters of A_P |
6263 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
6264 | -- because the compiler has transformed A_Ptr into a subtype of | |
6265 | -- F_Ptr. We catch this case in the code below. | |
5d37ba92 ES |
6266 | |
6267 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
6268 | or else | |
6269 | (Is_Generic_Type (Old_Formal_Base) | |
6270 | and then Is_Generic_Type (New_Formal_Base) | |
6271 | and then Is_Internal (New_Formal_Base) | |
6272 | and then Etype (Etype (New_Formal_Base)) = | |
6273 | Old_Formal_Base)) | |
ec4867fa | 6274 | and then Directly_Designated_Type (Old_Formal_Base) = |
8fde064e | 6275 | Directly_Designated_Type (New_Formal_Base) |
ec4867fa ES |
6276 | and then ((Is_Itype (Old_Formal_Base) |
6277 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
6278 | or else | |
6279 | (Is_Itype (New_Formal_Base) | |
6280 | and then Can_Never_Be_Null (New_Formal_Base))); | |
6281 | ||
996ae0b0 RK |
6282 | -- Types must always match. In the visible part of an instance, |
6283 | -- usual overloading rules for dispatching operations apply, and | |
6284 | -- we check base types (not the actual subtypes). | |
6285 | ||
6286 | if In_Instance_Visible_Part | |
6287 | and then Is_Dispatching_Operation (New_Id) | |
6288 | then | |
6289 | if not Conforming_Types | |
ec4867fa ES |
6290 | (T1 => Base_Type (Etype (Old_Formal)), |
6291 | T2 => Base_Type (Etype (New_Formal)), | |
6292 | Ctype => Ctype, | |
6293 | Get_Inst => Get_Inst) | |
6294 | and then not Access_Types_Match | |
996ae0b0 | 6295 | then |
5d37ba92 | 6296 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
6297 | return; |
6298 | end if; | |
6299 | ||
6300 | elsif not Conforming_Types | |
5d37ba92 ES |
6301 | (T1 => Old_Formal_Base, |
6302 | T2 => New_Formal_Base, | |
ec4867fa ES |
6303 | Ctype => Ctype, |
6304 | Get_Inst => Get_Inst) | |
6305 | and then not Access_Types_Match | |
996ae0b0 | 6306 | then |
c27f2f15 RD |
6307 | -- Don't give error message if old type is Any_Type. This test |
6308 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
6309 | ||
6310 | if Errmsg and then Old_Formal_Base = Any_Type then | |
6311 | Conforms := False; | |
6312 | else | |
7f568bfa AC |
6313 | if Ctype >= Subtype_Conformant |
6314 | and then | |
6315 | not Predicates_Match (Old_Formal_Base, New_Formal_Base) | |
6316 | then | |
6317 | Conformance_Error | |
6318 | ("\predicate of & does not match!", New_Formal); | |
6319 | else | |
6320 | Conformance_Error | |
6321 | ("\type of & does not match!", New_Formal); | |
6322 | end if; | |
c27f2f15 RD |
6323 | end if; |
6324 | ||
996ae0b0 RK |
6325 | return; |
6326 | end if; | |
6327 | ||
6328 | -- For mode conformance, mode must match | |
6329 | ||
5d37ba92 ES |
6330 | if Ctype >= Mode_Conformant then |
6331 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
6332 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
6333 | or else not Is_Primitive_Wrapper (New_Id) | |
6334 | then | |
6335 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 6336 | |
dd54644b JM |
6337 | else |
6338 | declare | |
c199ccf7 | 6339 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b JM |
6340 | begin |
6341 | if Is_Protected_Type | |
6342 | (Corresponding_Concurrent_Type (T)) | |
6343 | then | |
6344 | Error_Msg_PT (T, New_Id); | |
6345 | else | |
6346 | Conformance_Error | |
6347 | ("\mode of & does not match!", New_Formal); | |
6348 | end if; | |
6349 | end; | |
6350 | end if; | |
6351 | ||
5d37ba92 ES |
6352 | return; |
6353 | ||
6354 | -- Part of mode conformance for access types is having the same | |
6355 | -- constant modifier. | |
6356 | ||
6357 | elsif Access_Types_Match | |
6358 | and then Is_Access_Constant (Old_Formal_Base) /= | |
6359 | Is_Access_Constant (New_Formal_Base) | |
6360 | then | |
6361 | Conformance_Error | |
6362 | ("\constant modifier does not match!", New_Formal); | |
6363 | return; | |
6364 | end if; | |
996ae0b0 RK |
6365 | end if; |
6366 | ||
0a36105d | 6367 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 6368 | |
0a36105d JM |
6369 | -- Ada 2005 (AI-231): In case of anonymous access types check |
6370 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
6371 | -- match. For null exclusion, we test the types rather than the |
6372 | -- formals themselves, since the attribute is only set reliably | |
6373 | -- on the formals in the Ada 95 case, and we exclude the case | |
6374 | -- where Old_Formal is marked as controlling, to avoid errors | |
6375 | -- when matching completing bodies with dispatching declarations | |
6376 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 6377 | |
0791fbe9 | 6378 | if Ada_Version >= Ada_2005 |
0a36105d JM |
6379 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
6380 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
6381 | and then | |
c7b9d548 AC |
6382 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
6383 | Can_Never_Be_Null (Etype (New_Formal)) | |
6384 | and then | |
6385 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
6386 | or else |
6387 | Is_Access_Constant (Etype (Old_Formal)) /= | |
6388 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
6389 | |
6390 | -- Do not complain if error already posted on New_Formal. This | |
6391 | -- avoids some redundant error messages. | |
6392 | ||
6393 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
6394 | then |
6395 | -- It is allowed to omit the null-exclusion in case of stream | |
6396 | -- attribute subprograms. We recognize stream subprograms | |
6397 | -- through their TSS-generated suffix. | |
996ae0b0 | 6398 | |
0a36105d JM |
6399 | declare |
6400 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
3ada950b | 6401 | |
0a36105d JM |
6402 | begin |
6403 | if TSS_Name /= TSS_Stream_Read | |
6404 | and then TSS_Name /= TSS_Stream_Write | |
6405 | and then TSS_Name /= TSS_Stream_Input | |
6406 | and then TSS_Name /= TSS_Stream_Output | |
6407 | then | |
3ada950b | 6408 | -- Here we have a definite conformance error. It is worth |
71fb4dc8 | 6409 | -- special casing the error message for the case of a |
3ada950b AC |
6410 | -- controlling formal (which excludes null). |
6411 | ||
6412 | if Is_Controlling_Formal (New_Formal) then | |
6413 | Error_Msg_Node_2 := Scope (New_Formal); | |
6414 | Conformance_Error | |
6415 | ("\controlling formal& of& excludes null, " | |
6416 | & "declaration must exclude null as well", | |
6417 | New_Formal); | |
6418 | ||
6419 | -- Normal case (couldn't we give more detail here???) | |
6420 | ||
6421 | else | |
6422 | Conformance_Error | |
6423 | ("\type of & does not match!", New_Formal); | |
6424 | end if; | |
6425 | ||
0a36105d JM |
6426 | return; |
6427 | end if; | |
6428 | end; | |
6429 | end if; | |
6430 | end if; | |
41251c60 | 6431 | |
0a36105d | 6432 | -- Full conformance checks |
41251c60 | 6433 | |
0a36105d | 6434 | if Ctype = Fully_Conformant then |
e660dbf7 | 6435 | |
0a36105d | 6436 | -- We have checked already that names match |
e660dbf7 | 6437 | |
0a36105d | 6438 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
6439 | |
6440 | -- Check default expressions for in parameters | |
6441 | ||
996ae0b0 RK |
6442 | declare |
6443 | NewD : constant Boolean := | |
6444 | Present (Default_Value (New_Formal)); | |
6445 | OldD : constant Boolean := | |
6446 | Present (Default_Value (Old_Formal)); | |
6447 | begin | |
6448 | if NewD or OldD then | |
6449 | ||
82c80734 RD |
6450 | -- The old default value has been analyzed because the |
6451 | -- current full declaration will have frozen everything | |
0a36105d JM |
6452 | -- before. The new default value has not been analyzed, |
6453 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
6454 | |
6455 | if NewD then | |
0a36105d | 6456 | Push_Scope (New_Id); |
21d27997 | 6457 | Preanalyze_Spec_Expression |
fbf5a39b | 6458 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
6459 | End_Scope; |
6460 | end if; | |
6461 | ||
6462 | if not (NewD and OldD) | |
6463 | or else not Fully_Conformant_Expressions | |
6464 | (Default_Value (Old_Formal), | |
6465 | Default_Value (New_Formal)) | |
6466 | then | |
6467 | Conformance_Error | |
5d37ba92 | 6468 | ("\default expression for & does not match!", |
996ae0b0 RK |
6469 | New_Formal); |
6470 | return; | |
6471 | end if; | |
6472 | end if; | |
6473 | end; | |
6474 | end if; | |
6475 | end if; | |
6476 | ||
6477 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 6478 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
6479 | -- or if either old or new instance is not from the source program. |
6480 | ||
0ab80019 | 6481 | if Ada_Version = Ada_83 |
996ae0b0 RK |
6482 | and then Sloc (Old_Id) > Standard_Location |
6483 | and then Sloc (New_Id) > Standard_Location | |
6484 | and then Comes_From_Source (Old_Id) | |
6485 | and then Comes_From_Source (New_Id) | |
6486 | then | |
6487 | declare | |
6488 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
6489 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
6490 | ||
6491 | begin | |
6492 | -- Explicit IN must be present or absent in both cases. This | |
6493 | -- test is required only in the full conformance case. | |
6494 | ||
6495 | if In_Present (Old_Param) /= In_Present (New_Param) | |
6496 | and then Ctype = Fully_Conformant | |
6497 | then | |
6498 | Conformance_Error | |
5d37ba92 | 6499 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
6500 | New_Formal); |
6501 | return; | |
6502 | end if; | |
6503 | ||
6504 | -- Grouping (use of comma in param lists) must be the same | |
6505 | -- This is where we catch a misconformance like: | |
6506 | ||
0a36105d | 6507 | -- A, B : Integer |
996ae0b0 RK |
6508 | -- A : Integer; B : Integer |
6509 | ||
6510 | -- which are represented identically in the tree except | |
6511 | -- for the setting of the flags More_Ids and Prev_Ids. | |
6512 | ||
6513 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
6514 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
6515 | then | |
6516 | Conformance_Error | |
5d37ba92 | 6517 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
6518 | return; |
6519 | end if; | |
6520 | end; | |
6521 | end if; | |
6522 | ||
41251c60 JM |
6523 | -- This label is required when skipping controlling formals |
6524 | ||
6525 | <<Skip_Controlling_Formal>> | |
6526 | ||
996ae0b0 RK |
6527 | Next_Formal (Old_Formal); |
6528 | Next_Formal (New_Formal); | |
6529 | end loop; | |
6530 | ||
6531 | if Present (Old_Formal) then | |
5d37ba92 | 6532 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
6533 | return; |
6534 | ||
6535 | elsif Present (New_Formal) then | |
5d37ba92 | 6536 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
6537 | return; |
6538 | end if; | |
996ae0b0 RK |
6539 | end Check_Conformance; |
6540 | ||
ec4867fa ES |
6541 | ----------------------- |
6542 | -- Check_Conventions -- | |
6543 | ----------------------- | |
6544 | ||
6545 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 6546 | Ifaces_List : Elist_Id; |
0a36105d | 6547 | |
ce2b6ba5 | 6548 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
6549 | -- Verify that the convention of inherited dispatching operation Op is |
6550 | -- consistent among all subprograms it overrides. In order to minimize | |
6551 | -- the search, Search_From is utilized to designate a specific point in | |
6552 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
6553 | |
6554 | ---------------------- | |
6555 | -- Check_Convention -- | |
6556 | ---------------------- | |
6557 | ||
ce2b6ba5 | 6558 | procedure Check_Convention (Op : Entity_Id) is |
9f6aaa5c AC |
6559 | function Convention_Of (Id : Entity_Id) return Convention_Id; |
6560 | -- Given an entity, return its convention. The function treats Ghost | |
6561 | -- as convention Ada because the two have the same dynamic semantics. | |
6562 | ||
6563 | ------------------- | |
6564 | -- Convention_Of -- | |
6565 | ------------------- | |
6566 | ||
6567 | function Convention_Of (Id : Entity_Id) return Convention_Id is | |
6568 | Conv : constant Convention_Id := Convention (Id); | |
6569 | begin | |
6570 | if Conv = Convention_Ghost then | |
6571 | return Convention_Ada; | |
6572 | else | |
6573 | return Conv; | |
6574 | end if; | |
6575 | end Convention_Of; | |
6576 | ||
6577 | -- Local variables | |
6578 | ||
6579 | Op_Conv : constant Convention_Id := Convention_Of (Op); | |
6580 | Iface_Conv : Convention_Id; | |
ce2b6ba5 JM |
6581 | Iface_Elmt : Elmt_Id; |
6582 | Iface_Prim_Elmt : Elmt_Id; | |
6583 | Iface_Prim : Entity_Id; | |
ec4867fa | 6584 | |
9f6aaa5c AC |
6585 | -- Start of processing for Check_Convention |
6586 | ||
ce2b6ba5 JM |
6587 | begin |
6588 | Iface_Elmt := First_Elmt (Ifaces_List); | |
6589 | while Present (Iface_Elmt) loop | |
6590 | Iface_Prim_Elmt := | |
9f6aaa5c | 6591 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
ce2b6ba5 JM |
6592 | while Present (Iface_Prim_Elmt) loop |
6593 | Iface_Prim := Node (Iface_Prim_Elmt); | |
9f6aaa5c | 6594 | Iface_Conv := Convention_Of (Iface_Prim); |
ce2b6ba5 JM |
6595 | |
6596 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
9f6aaa5c | 6597 | and then Iface_Conv /= Op_Conv |
ce2b6ba5 | 6598 | then |
ed2233dc | 6599 | Error_Msg_N |
ce2b6ba5 | 6600 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 6601 | |
ce2b6ba5 | 6602 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c | 6603 | Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
ce2b6ba5 | 6604 | Error_Msg_Sloc := Sloc (Op); |
ec4867fa | 6605 | |
7a963087 | 6606 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 6607 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 6608 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 6609 | else |
ed2233dc | 6610 | Error_Msg_N |
19d846a0 RD |
6611 | ("\\overriding operation % with " & |
6612 | "convention % defined #", Typ); | |
ce2b6ba5 | 6613 | end if; |
ec4867fa | 6614 | |
ce2b6ba5 JM |
6615 | else pragma Assert (Present (Alias (Op))); |
6616 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
ed2233dc | 6617 | Error_Msg_N |
19d846a0 RD |
6618 | ("\\inherited operation % with " & |
6619 | "convention % defined #", Typ); | |
ce2b6ba5 | 6620 | end if; |
ec4867fa | 6621 | |
ce2b6ba5 | 6622 | Error_Msg_Name_1 := Chars (Op); |
9f6aaa5c AC |
6623 | Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
6624 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
ed2233dc | 6625 | Error_Msg_N |
19d846a0 RD |
6626 | ("\\overridden operation % with " & |
6627 | "convention % defined #", Typ); | |
ec4867fa | 6628 | |
ce2b6ba5 | 6629 | -- Avoid cascading errors |
ec4867fa | 6630 | |
ce2b6ba5 JM |
6631 | return; |
6632 | end if; | |
ec4867fa | 6633 | |
ce2b6ba5 JM |
6634 | Next_Elmt (Iface_Prim_Elmt); |
6635 | end loop; | |
ec4867fa | 6636 | |
ce2b6ba5 | 6637 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
6638 | end loop; |
6639 | end Check_Convention; | |
6640 | ||
6641 | -- Local variables | |
6642 | ||
6643 | Prim_Op : Entity_Id; | |
6644 | Prim_Op_Elmt : Elmt_Id; | |
6645 | ||
6646 | -- Start of processing for Check_Conventions | |
6647 | ||
6648 | begin | |
ce2b6ba5 JM |
6649 | if not Has_Interfaces (Typ) then |
6650 | return; | |
6651 | end if; | |
6652 | ||
6653 | Collect_Interfaces (Typ, Ifaces_List); | |
6654 | ||
0a36105d JM |
6655 | -- The algorithm checks every overriding dispatching operation against |
6656 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 6657 | -- differences in conventions. |
ec4867fa ES |
6658 | |
6659 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
6660 | while Present (Prim_Op_Elmt) loop | |
6661 | Prim_Op := Node (Prim_Op_Elmt); | |
6662 | ||
0a36105d | 6663 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 6664 | -- since they always have the same convention. |
ec4867fa | 6665 | |
ce2b6ba5 JM |
6666 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
6667 | Check_Convention (Prim_Op); | |
ec4867fa ES |
6668 | end if; |
6669 | ||
6670 | Next_Elmt (Prim_Op_Elmt); | |
6671 | end loop; | |
6672 | end Check_Conventions; | |
6673 | ||
996ae0b0 RK |
6674 | ------------------------------ |
6675 | -- Check_Delayed_Subprogram -- | |
6676 | ------------------------------ | |
6677 | ||
6678 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
6679 | F : Entity_Id; | |
6680 | ||
6681 | procedure Possible_Freeze (T : Entity_Id); | |
6682 | -- T is the type of either a formal parameter or of the return type. | |
6683 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
6684 | -- subprogram itself must be delayed. If T is the limited view of an |
6685 | -- incomplete type the subprogram must be frozen as well, because | |
6686 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 6687 | |
82c80734 RD |
6688 | --------------------- |
6689 | -- Possible_Freeze -- | |
6690 | --------------------- | |
6691 | ||
996ae0b0 RK |
6692 | procedure Possible_Freeze (T : Entity_Id) is |
6693 | begin | |
4a13695c | 6694 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
6695 | Set_Has_Delayed_Freeze (Designator); |
6696 | ||
6697 | elsif Is_Access_Type (T) | |
6698 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
6699 | and then not Is_Frozen (Designated_Type (T)) | |
6700 | then | |
6701 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 6702 | |
7b56a91b AC |
6703 | elsif Ekind (T) = E_Incomplete_Type |
6704 | and then From_Limited_With (T) | |
6705 | then | |
e358346d | 6706 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 6707 | |
9aff36e9 RD |
6708 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
6709 | -- of a subprogram or entry declaration. | |
406935b6 AC |
6710 | |
6711 | elsif Ekind (T) = E_Incomplete_Type | |
6712 | and then Ada_Version >= Ada_2012 | |
6713 | then | |
6714 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 6715 | end if; |
4a13695c | 6716 | |
996ae0b0 RK |
6717 | end Possible_Freeze; |
6718 | ||
6719 | -- Start of processing for Check_Delayed_Subprogram | |
6720 | ||
6721 | begin | |
76e3504f AC |
6722 | -- All subprograms, including abstract subprograms, may need a freeze |
6723 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 6724 | |
76e3504f AC |
6725 | Possible_Freeze (Etype (Designator)); |
6726 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 6727 | |
76e3504f AC |
6728 | -- Need delayed freeze if any of the formal types themselves need |
6729 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 6730 | |
76e3504f AC |
6731 | F := First_Formal (Designator); |
6732 | while Present (F) loop | |
6733 | Possible_Freeze (Etype (F)); | |
6734 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
6735 | Next_Formal (F); | |
6736 | end loop; | |
996ae0b0 RK |
6737 | |
6738 | -- Mark functions that return by reference. Note that it cannot be | |
6739 | -- done for delayed_freeze subprograms because the underlying | |
6740 | -- returned type may not be known yet (for private types) | |
6741 | ||
8fde064e | 6742 | if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
996ae0b0 RK |
6743 | declare |
6744 | Typ : constant Entity_Id := Etype (Designator); | |
6745 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
996ae0b0 | 6746 | begin |
51245e2d | 6747 | if Is_Limited_View (Typ) then |
996ae0b0 | 6748 | Set_Returns_By_Ref (Designator); |
048e5cef | 6749 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
6750 | Set_Returns_By_Ref (Designator); |
6751 | end if; | |
6752 | end; | |
6753 | end if; | |
6754 | end Check_Delayed_Subprogram; | |
6755 | ||
6756 | ------------------------------------ | |
6757 | -- Check_Discriminant_Conformance -- | |
6758 | ------------------------------------ | |
6759 | ||
6760 | procedure Check_Discriminant_Conformance | |
6761 | (N : Node_Id; | |
6762 | Prev : Entity_Id; | |
6763 | Prev_Loc : Node_Id) | |
6764 | is | |
6765 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
6766 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
6767 | New_Discr_Id : Entity_Id; | |
6768 | New_Discr_Type : Entity_Id; | |
6769 | ||
6770 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
6771 | -- Post error message for conformance error on given node. Two messages |
6772 | -- are output. The first points to the previous declaration with a | |
6773 | -- general "no conformance" message. The second is the detailed reason, | |
6774 | -- supplied as Msg. The parameter N provide information for a possible | |
6775 | -- & insertion in the message. | |
996ae0b0 RK |
6776 | |
6777 | ----------------------- | |
6778 | -- Conformance_Error -- | |
6779 | ----------------------- | |
6780 | ||
6781 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
6782 | begin | |
6783 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
6784 | Error_Msg_N -- CODEFIX |
6785 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
6786 | Error_Msg_NE (Msg, N, N); |
6787 | end Conformance_Error; | |
6788 | ||
6789 | -- Start of processing for Check_Discriminant_Conformance | |
6790 | ||
6791 | begin | |
6792 | while Present (Old_Discr) and then Present (New_Discr) loop | |
996ae0b0 RK |
6793 | New_Discr_Id := Defining_Identifier (New_Discr); |
6794 | ||
82c80734 RD |
6795 | -- The subtype mark of the discriminant on the full type has not |
6796 | -- been analyzed so we do it here. For an access discriminant a new | |
6797 | -- type is created. | |
996ae0b0 RK |
6798 | |
6799 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
6800 | New_Discr_Type := | |
6801 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
6802 | ||
6803 | else | |
6804 | Analyze (Discriminant_Type (New_Discr)); | |
6805 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
6806 | |
6807 | -- Ada 2005: if the discriminant definition carries a null | |
6808 | -- exclusion, create an itype to check properly for consistency | |
6809 | -- with partial declaration. | |
6810 | ||
6811 | if Is_Access_Type (New_Discr_Type) | |
8fde064e | 6812 | and then Null_Exclusion_Present (New_Discr) |
e50e1c5e AC |
6813 | then |
6814 | New_Discr_Type := | |
6815 | Create_Null_Excluding_Itype | |
6816 | (T => New_Discr_Type, | |
6817 | Related_Nod => New_Discr, | |
6818 | Scope_Id => Current_Scope); | |
6819 | end if; | |
996ae0b0 RK |
6820 | end if; |
6821 | ||
6822 | if not Conforming_Types | |
6823 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
6824 | then | |
6825 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
6826 | return; | |
fbf5a39b | 6827 | else |
82c80734 RD |
6828 | -- Treat the new discriminant as an occurrence of the old one, |
6829 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
6830 | -- information, for completeness. |
6831 | ||
6832 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
6833 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
6834 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
6835 | end if; |
6836 | ||
6837 | -- Names must match | |
6838 | ||
6839 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
6840 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
6841 | return; | |
6842 | end if; | |
6843 | ||
6844 | -- Default expressions must match | |
6845 | ||
6846 | declare | |
6847 | NewD : constant Boolean := | |
6848 | Present (Expression (New_Discr)); | |
6849 | OldD : constant Boolean := | |
6850 | Present (Expression (Parent (Old_Discr))); | |
6851 | ||
6852 | begin | |
6853 | if NewD or OldD then | |
6854 | ||
6855 | -- The old default value has been analyzed and expanded, | |
6856 | -- because the current full declaration will have frozen | |
82c80734 RD |
6857 | -- everything before. The new default values have not been |
6858 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
6859 | |
6860 | if NewD then | |
21d27997 | 6861 | Preanalyze_Spec_Expression |
996ae0b0 RK |
6862 | (Expression (New_Discr), New_Discr_Type); |
6863 | end if; | |
6864 | ||
6865 | if not (NewD and OldD) | |
6866 | or else not Fully_Conformant_Expressions | |
6867 | (Expression (Parent (Old_Discr)), | |
6868 | Expression (New_Discr)) | |
6869 | ||
6870 | then | |
6871 | Conformance_Error | |
6872 | ("default expression for & does not match!", | |
6873 | New_Discr_Id); | |
6874 | return; | |
6875 | end if; | |
6876 | end if; | |
6877 | end; | |
6878 | ||
6879 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
6880 | ||
0ab80019 | 6881 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
6882 | declare |
6883 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
6884 | ||
6885 | begin | |
6886 | -- Grouping (use of comma in param lists) must be the same | |
6887 | -- This is where we catch a misconformance like: | |
6888 | ||
60370fb1 | 6889 | -- A, B : Integer |
996ae0b0 RK |
6890 | -- A : Integer; B : Integer |
6891 | ||
6892 | -- which are represented identically in the tree except | |
6893 | -- for the setting of the flags More_Ids and Prev_Ids. | |
6894 | ||
6895 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
6896 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
6897 | then | |
6898 | Conformance_Error | |
6899 | ("grouping of & does not match!", New_Discr_Id); | |
6900 | return; | |
6901 | end if; | |
6902 | end; | |
6903 | end if; | |
6904 | ||
6905 | Next_Discriminant (Old_Discr); | |
6906 | Next (New_Discr); | |
6907 | end loop; | |
6908 | ||
6909 | if Present (Old_Discr) then | |
6910 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
6911 | return; | |
6912 | ||
6913 | elsif Present (New_Discr) then | |
6914 | Conformance_Error | |
6915 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
6916 | return; | |
6917 | end if; | |
6918 | end Check_Discriminant_Conformance; | |
6919 | ||
6920 | ---------------------------- | |
6921 | -- Check_Fully_Conformant -- | |
6922 | ---------------------------- | |
6923 | ||
6924 | procedure Check_Fully_Conformant | |
6925 | (New_Id : Entity_Id; | |
6926 | Old_Id : Entity_Id; | |
6927 | Err_Loc : Node_Id := Empty) | |
6928 | is | |
6929 | Result : Boolean; | |
81db9d77 | 6930 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6931 | begin |
6932 | Check_Conformance | |
6933 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
6934 | end Check_Fully_Conformant; | |
6935 | ||
6936 | --------------------------- | |
6937 | -- Check_Mode_Conformant -- | |
6938 | --------------------------- | |
6939 | ||
6940 | procedure Check_Mode_Conformant | |
6941 | (New_Id : Entity_Id; | |
6942 | Old_Id : Entity_Id; | |
6943 | Err_Loc : Node_Id := Empty; | |
6944 | Get_Inst : Boolean := False) | |
6945 | is | |
6946 | Result : Boolean; | |
81db9d77 | 6947 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6948 | begin |
6949 | Check_Conformance | |
6950 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
6951 | end Check_Mode_Conformant; | |
6952 | ||
fbf5a39b | 6953 | -------------------------------- |
758c442c | 6954 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
6955 | -------------------------------- |
6956 | ||
758c442c | 6957 | procedure Check_Overriding_Indicator |
ec4867fa | 6958 | (Subp : Entity_Id; |
5d37ba92 ES |
6959 | Overridden_Subp : Entity_Id; |
6960 | Is_Primitive : Boolean) | |
fbf5a39b | 6961 | is |
758c442c GD |
6962 | Decl : Node_Id; |
6963 | Spec : Node_Id; | |
fbf5a39b AC |
6964 | |
6965 | begin | |
ec4867fa | 6966 | -- No overriding indicator for literals |
fbf5a39b | 6967 | |
ec4867fa | 6968 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 6969 | return; |
fbf5a39b | 6970 | |
ec4867fa ES |
6971 | elsif Ekind (Subp) = E_Entry then |
6972 | Decl := Parent (Subp); | |
6973 | ||
53b10ce9 AC |
6974 | -- No point in analyzing a malformed operator |
6975 | ||
6976 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
6977 | and then Error_Posted (Subp) | |
6978 | then | |
6979 | return; | |
6980 | ||
758c442c GD |
6981 | else |
6982 | Decl := Unit_Declaration_Node (Subp); | |
6983 | end if; | |
fbf5a39b | 6984 | |
800621e0 RD |
6985 | if Nkind_In (Decl, N_Subprogram_Body, |
6986 | N_Subprogram_Body_Stub, | |
6987 | N_Subprogram_Declaration, | |
6988 | N_Abstract_Subprogram_Declaration, | |
6989 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
6990 | then |
6991 | Spec := Specification (Decl); | |
ec4867fa ES |
6992 | |
6993 | elsif Nkind (Decl) = N_Entry_Declaration then | |
6994 | Spec := Decl; | |
6995 | ||
758c442c GD |
6996 | else |
6997 | return; | |
6998 | end if; | |
fbf5a39b | 6999 | |
e7d72fb9 AC |
7000 | -- The overriding operation is type conformant with the overridden one, |
7001 | -- but the names of the formals are not required to match. If the names | |
6823270c | 7002 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
7003 | -- source of confusion that is worth diagnosing. Controlling formals |
7004 | -- often carry names that reflect the type, and it is not worthwhile | |
7005 | -- requiring that their names match. | |
7006 | ||
c9e7bd8e | 7007 | if Present (Overridden_Subp) |
e7d72fb9 AC |
7008 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
7009 | then | |
7010 | declare | |
7011 | Form1 : Entity_Id; | |
7012 | Form2 : Entity_Id; | |
7013 | ||
7014 | begin | |
7015 | Form1 := First_Formal (Subp); | |
7016 | Form2 := First_Formal (Overridden_Subp); | |
7017 | ||
c9e7bd8e AC |
7018 | -- If the overriding operation is a synchronized operation, skip |
7019 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
7020 | -- implicit in the new one. If the operation is declared in the |
7021 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 7022 | |
6823270c AC |
7023 | if Is_Concurrent_Type (Scope (Subp)) |
7024 | and then Is_Tagged_Type (Scope (Subp)) | |
7025 | and then not Has_Completion (Scope (Subp)) | |
7026 | then | |
c9e7bd8e AC |
7027 | Form2 := Next_Formal (Form2); |
7028 | end if; | |
7029 | ||
e7d72fb9 AC |
7030 | if Present (Form1) then |
7031 | Form1 := Next_Formal (Form1); | |
7032 | Form2 := Next_Formal (Form2); | |
7033 | end if; | |
7034 | ||
7035 | while Present (Form1) loop | |
7036 | if not Is_Controlling_Formal (Form1) | |
7037 | and then Present (Next_Formal (Form2)) | |
7038 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
7039 | then | |
7040 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
7041 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 7042 | Error_Msg_NE |
19d846a0 | 7043 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
7044 | Form1, Form1); |
7045 | exit; | |
7046 | end if; | |
7047 | ||
7048 | Next_Formal (Form1); | |
7049 | Next_Formal (Form2); | |
7050 | end loop; | |
7051 | end; | |
7052 | end if; | |
7053 | ||
676e8420 AC |
7054 | -- If there is an overridden subprogram, then check that there is no |
7055 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
7056 | -- This is not done if the overridden subprogram is marked as hidden, |
7057 | -- which can occur for the case of inherited controlled operations | |
7058 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
7059 | -- subprogram is not itself hidden. (Note: This condition could probably | |
7060 | -- be simplified, leaving out the testing for the specific controlled | |
7061 | -- cases, but it seems safer and clearer this way, and echoes similar | |
7062 | -- special-case tests of this kind in other places.) | |
7063 | ||
fd0d899b | 7064 | if Present (Overridden_Subp) |
51bf9bdf AC |
7065 | and then (not Is_Hidden (Overridden_Subp) |
7066 | or else | |
b69cd36a AC |
7067 | (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
7068 | Name_Adjust, | |
7069 | Name_Finalize) | |
f0709ca6 AC |
7070 | and then Present (Alias (Overridden_Subp)) |
7071 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 7072 | then |
ec4867fa ES |
7073 | if Must_Not_Override (Spec) then |
7074 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 7075 | |
ec4867fa | 7076 | if Ekind (Subp) = E_Entry then |
ed2233dc | 7077 | Error_Msg_NE |
5d37ba92 | 7078 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 7079 | else |
ed2233dc | 7080 | Error_Msg_NE |
5d37ba92 | 7081 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 7082 | end if; |
21d27997 | 7083 | |
bd603506 | 7084 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
7085 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
7086 | -- operation. This operation should not be inherited by other limited | |
7087 | -- controlled types. An explicit Adjust for them is not overriding. | |
7088 | ||
7089 | elsif Must_Override (Spec) | |
7090 | and then Chars (Overridden_Subp) = Name_Adjust | |
7091 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
7092 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
7093 | and then |
7094 | Is_Predefined_File_Name | |
7095 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
7096 | then |
7097 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
7098 | ||
21d27997 | 7099 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
7100 | if Is_Init_Proc (Subp) then |
7101 | null; | |
7102 | ||
7103 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
7104 | |
7105 | -- For entities generated by Derive_Subprograms the overridden | |
7106 | -- operation is the inherited primitive (which is available | |
7107 | -- through the attribute alias) | |
7108 | ||
7109 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 7110 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 7111 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
7112 | and then Find_Dispatching_Type (Overridden_Subp) = |
7113 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
7114 | and then Present (Alias (Overridden_Subp)) |
7115 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
7116 | then | |
7117 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 7118 | |
1c1289e7 AC |
7119 | else |
7120 | Set_Overridden_Operation (Subp, Overridden_Subp); | |
7121 | end if; | |
7122 | end if; | |
ec4867fa | 7123 | end if; |
f937473f | 7124 | |
618fb570 AC |
7125 | -- If primitive flag is set or this is a protected operation, then |
7126 | -- the operation is overriding at the point of its declaration, so | |
7127 | -- warn if necessary. Otherwise it may have been declared before the | |
7128 | -- operation it overrides and no check is required. | |
3c25856a AC |
7129 | |
7130 | if Style_Check | |
618fb570 AC |
7131 | and then not Must_Override (Spec) |
7132 | and then (Is_Primitive | |
7133 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 7134 | then |
235f4375 AC |
7135 | Style.Missing_Overriding (Decl, Subp); |
7136 | end if; | |
7137 | ||
53b10ce9 AC |
7138 | -- If Subp is an operator, it may override a predefined operation, if |
7139 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 7140 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
7141 | -- representation for predefined operators. We have to check whether the |
7142 | -- signature of Subp matches that of a predefined operator. Note that | |
7143 | -- first argument provides the name of the operator, and the second | |
7144 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
7145 | -- If the indicator is overriding, then the operator must match a |
7146 | -- predefined signature, because we know already that there is no | |
7147 | -- explicit overridden operation. | |
f937473f | 7148 | |
21d27997 | 7149 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 7150 | if Must_Not_Override (Spec) then |
f937473f | 7151 | |
806f6d37 AC |
7152 | -- If this is not a primitive or a protected subprogram, then |
7153 | -- "not overriding" is illegal. | |
618fb570 | 7154 | |
806f6d37 AC |
7155 | if not Is_Primitive |
7156 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
7157 | then | |
7158 | Error_Msg_N | |
7159 | ("overriding indicator only allowed " | |
7160 | & "if subprogram is primitive", Subp); | |
618fb570 | 7161 | |
806f6d37 AC |
7162 | elsif Can_Override_Operator (Subp) then |
7163 | Error_Msg_NE | |
7164 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
7165 | end if; | |
f937473f | 7166 | |
806f6d37 AC |
7167 | elsif Must_Override (Spec) then |
7168 | if No (Overridden_Operation (Subp)) | |
7169 | and then not Can_Override_Operator (Subp) | |
7170 | then | |
7171 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
7172 | end if; | |
5d37ba92 | 7173 | |
806f6d37 AC |
7174 | elsif not Error_Posted (Subp) |
7175 | and then Style_Check | |
7176 | and then Can_Override_Operator (Subp) | |
7177 | and then | |
7178 | not Is_Predefined_File_Name | |
7179 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
7180 | then | |
7181 | -- If style checks are enabled, indicate that the indicator is | |
7182 | -- missing. However, at the point of declaration, the type of | |
7183 | -- which this is a primitive operation may be private, in which | |
7184 | -- case the indicator would be premature. | |
235f4375 | 7185 | |
806f6d37 AC |
7186 | if Has_Private_Declaration (Etype (Subp)) |
7187 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 7188 | then |
806f6d37 AC |
7189 | null; |
7190 | else | |
7191 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 7192 | end if; |
806f6d37 | 7193 | end if; |
21d27997 RD |
7194 | |
7195 | elsif Must_Override (Spec) then | |
7196 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 7197 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 7198 | else |
ed2233dc | 7199 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 7200 | end if; |
5d37ba92 ES |
7201 | |
7202 | -- If the operation is marked "not overriding" and it's not primitive | |
7203 | -- then an error is issued, unless this is an operation of a task or | |
7204 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
7205 | -- has been specified have already been checked above. | |
7206 | ||
7207 | elsif Must_Not_Override (Spec) | |
7208 | and then not Is_Primitive | |
7209 | and then Ekind (Subp) /= E_Entry | |
7210 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
7211 | then | |
ed2233dc | 7212 | Error_Msg_N |
5d37ba92 ES |
7213 | ("overriding indicator only allowed if subprogram is primitive", |
7214 | Subp); | |
5d37ba92 | 7215 | return; |
fbf5a39b | 7216 | end if; |
758c442c | 7217 | end Check_Overriding_Indicator; |
fbf5a39b | 7218 | |
996ae0b0 RK |
7219 | ------------------- |
7220 | -- Check_Returns -- | |
7221 | ------------------- | |
7222 | ||
0a36105d JM |
7223 | -- Note: this procedure needs to know far too much about how the expander |
7224 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
7225 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
7226 | -- works, but is not very clean. It would be better if the expansion | |
7227 | -- routines would leave Original_Node working nicely, and we could use | |
7228 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
7229 | ||
996ae0b0 RK |
7230 | procedure Check_Returns |
7231 | (HSS : Node_Id; | |
7232 | Mode : Character; | |
c8ef728f ES |
7233 | Err : out Boolean; |
7234 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
7235 | is |
7236 | Handler : Node_Id; | |
7237 | ||
7238 | procedure Check_Statement_Sequence (L : List_Id); | |
7239 | -- Internal recursive procedure to check a list of statements for proper | |
7240 | -- termination by a return statement (or a transfer of control or a | |
7241 | -- compound statement that is itself internally properly terminated). | |
7242 | ||
7243 | ------------------------------ | |
7244 | -- Check_Statement_Sequence -- | |
7245 | ------------------------------ | |
7246 | ||
7247 | procedure Check_Statement_Sequence (L : List_Id) is | |
7248 | Last_Stm : Node_Id; | |
0a36105d | 7249 | Stm : Node_Id; |
996ae0b0 RK |
7250 | Kind : Node_Kind; |
7251 | ||
7b27e183 AC |
7252 | function Assert_False return Boolean; |
7253 | -- Returns True if Last_Stm is a pragma Assert (False) that has been | |
7254 | -- rewritten as a null statement when assertions are off. The assert | |
7255 | -- is not active, but it is still enough to kill the warning. | |
7256 | ||
7257 | ------------------ | |
7258 | -- Assert_False -- | |
7259 | ------------------ | |
7260 | ||
7261 | function Assert_False return Boolean is | |
7262 | Orig : constant Node_Id := Original_Node (Last_Stm); | |
7263 | ||
7264 | begin | |
7265 | if Nkind (Orig) = N_Pragma | |
7266 | and then Pragma_Name (Orig) = Name_Assert | |
7267 | and then not Error_Posted (Orig) | |
7268 | then | |
7269 | declare | |
7270 | Arg : constant Node_Id := | |
7271 | First (Pragma_Argument_Associations (Orig)); | |
7272 | Exp : constant Node_Id := Expression (Arg); | |
7273 | begin | |
7274 | return Nkind (Exp) = N_Identifier | |
7275 | and then Chars (Exp) = Name_False; | |
7276 | end; | |
7277 | ||
7278 | else | |
7279 | return False; | |
7280 | end if; | |
7281 | end Assert_False; | |
7282 | ||
7283 | -- Local variables | |
7284 | ||
996ae0b0 RK |
7285 | Raise_Exception_Call : Boolean; |
7286 | -- Set True if statement sequence terminated by Raise_Exception call | |
7287 | -- or a Reraise_Occurrence call. | |
7288 | ||
7b27e183 AC |
7289 | -- Start of processing for Check_Statement_Sequence |
7290 | ||
996ae0b0 RK |
7291 | begin |
7292 | Raise_Exception_Call := False; | |
7293 | ||
7294 | -- Get last real statement | |
7295 | ||
7296 | Last_Stm := Last (L); | |
7297 | ||
0a36105d JM |
7298 | -- Deal with digging out exception handler statement sequences that |
7299 | -- have been transformed by the local raise to goto optimization. | |
7300 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
7301 | -- optimization has occurred, we are looking at something like: | |
7302 | ||
7303 | -- begin | |
7304 | -- original stmts in block | |
7305 | ||
7306 | -- exception \ | |
7307 | -- when excep1 => | | |
7308 | -- goto L1; | omitted if No_Exception_Propagation | |
7309 | -- when excep2 => | | |
7310 | -- goto L2; / | |
7311 | -- end; | |
7312 | ||
7313 | -- goto L3; -- skip handler when exception not raised | |
7314 | ||
7315 | -- <<L1>> -- target label for local exception | |
7316 | -- begin | |
7317 | -- estmts1 | |
7318 | -- end; | |
7319 | ||
7320 | -- goto L3; | |
7321 | ||
7322 | -- <<L2>> | |
7323 | -- begin | |
7324 | -- estmts2 | |
7325 | -- end; | |
7326 | ||
7327 | -- <<L3>> | |
7328 | ||
7329 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
7330 | -- sequences (which were the original sequences of statements in | |
7331 | -- the exception handlers) and check them. | |
7332 | ||
8fde064e | 7333 | if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
0a36105d JM |
7334 | Stm := Last_Stm; |
7335 | loop | |
7336 | Prev (Stm); | |
7337 | exit when No (Stm); | |
7338 | exit when Nkind (Stm) /= N_Block_Statement; | |
7339 | exit when not Exception_Junk (Stm); | |
7340 | Prev (Stm); | |
7341 | exit when No (Stm); | |
7342 | exit when Nkind (Stm) /= N_Label; | |
7343 | exit when not Exception_Junk (Stm); | |
7344 | Check_Statement_Sequence | |
7345 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
7346 | ||
7347 | Prev (Stm); | |
7348 | Last_Stm := Stm; | |
7349 | exit when No (Stm); | |
7350 | exit when Nkind (Stm) /= N_Goto_Statement; | |
7351 | exit when not Exception_Junk (Stm); | |
7352 | end loop; | |
7353 | end if; | |
7354 | ||
996ae0b0 RK |
7355 | -- Don't count pragmas |
7356 | ||
7357 | while Nkind (Last_Stm) = N_Pragma | |
7358 | ||
7359 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
7360 | ||
7361 | or else | |
7362 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
7363 | and then | |
7364 | Nkind (Name (Last_Stm)) = N_Identifier | |
7365 | and then | |
7366 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
7367 | ||
7368 | -- Don't count exception junk | |
7369 | ||
7370 | or else | |
800621e0 RD |
7371 | (Nkind_In (Last_Stm, N_Goto_Statement, |
7372 | N_Label, | |
7373 | N_Object_Declaration) | |
8fde064e | 7374 | and then Exception_Junk (Last_Stm)) |
0a36105d JM |
7375 | or else Nkind (Last_Stm) in N_Push_xxx_Label |
7376 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
e3b3266c AC |
7377 | |
7378 | -- Inserted code, such as finalization calls, is irrelevant: we only | |
7379 | -- need to check original source. | |
7380 | ||
7381 | or else Is_Rewrite_Insertion (Last_Stm) | |
996ae0b0 RK |
7382 | loop |
7383 | Prev (Last_Stm); | |
7384 | end loop; | |
7385 | ||
7386 | -- Here we have the "real" last statement | |
7387 | ||
7388 | Kind := Nkind (Last_Stm); | |
7389 | ||
7390 | -- Transfer of control, OK. Note that in the No_Return procedure | |
7391 | -- case, we already diagnosed any explicit return statements, so | |
7392 | -- we can treat them as OK in this context. | |
7393 | ||
7394 | if Is_Transfer (Last_Stm) then | |
7395 | return; | |
7396 | ||
7397 | -- Check cases of explicit non-indirect procedure calls | |
7398 | ||
7399 | elsif Kind = N_Procedure_Call_Statement | |
7400 | and then Is_Entity_Name (Name (Last_Stm)) | |
7401 | then | |
7402 | -- Check call to Raise_Exception procedure which is treated | |
7403 | -- specially, as is a call to Reraise_Occurrence. | |
7404 | ||
7405 | -- We suppress the warning in these cases since it is likely that | |
7406 | -- the programmer really does not expect to deal with the case | |
7407 | -- of Null_Occurrence, and thus would find a warning about a | |
7408 | -- missing return curious, and raising Program_Error does not | |
7409 | -- seem such a bad behavior if this does occur. | |
7410 | ||
c8ef728f ES |
7411 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
7412 | -- behavior will be to raise Constraint_Error (see AI-329). | |
7413 | ||
996ae0b0 RK |
7414 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
7415 | or else | |
7416 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
7417 | then | |
7418 | Raise_Exception_Call := True; | |
7419 | ||
7420 | -- For Raise_Exception call, test first argument, if it is | |
7421 | -- an attribute reference for a 'Identity call, then we know | |
7422 | -- that the call cannot possibly return. | |
7423 | ||
7424 | declare | |
7425 | Arg : constant Node_Id := | |
7426 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
7427 | begin |
7428 | if Nkind (Arg) = N_Attribute_Reference | |
7429 | and then Attribute_Name (Arg) = Name_Identity | |
7430 | then | |
7431 | return; | |
7432 | end if; | |
7433 | end; | |
7434 | end if; | |
7435 | ||
7436 | -- If statement, need to look inside if there is an else and check | |
7437 | -- each constituent statement sequence for proper termination. | |
7438 | ||
7439 | elsif Kind = N_If_Statement | |
7440 | and then Present (Else_Statements (Last_Stm)) | |
7441 | then | |
7442 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
7443 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
7444 | ||
7445 | if Present (Elsif_Parts (Last_Stm)) then | |
7446 | declare | |
7447 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
7448 | ||
7449 | begin | |
7450 | while Present (Elsif_Part) loop | |
7451 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
7452 | Next (Elsif_Part); | |
7453 | end loop; | |
7454 | end; | |
7455 | end if; | |
7456 | ||
7457 | return; | |
7458 | ||
7459 | -- Case statement, check each case for proper termination | |
7460 | ||
7461 | elsif Kind = N_Case_Statement then | |
7462 | declare | |
7463 | Case_Alt : Node_Id; | |
996ae0b0 RK |
7464 | begin |
7465 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
7466 | while Present (Case_Alt) loop | |
7467 | Check_Statement_Sequence (Statements (Case_Alt)); | |
7468 | Next_Non_Pragma (Case_Alt); | |
7469 | end loop; | |
7470 | end; | |
7471 | ||
7472 | return; | |
7473 | ||
7474 | -- Block statement, check its handled sequence of statements | |
7475 | ||
7476 | elsif Kind = N_Block_Statement then | |
7477 | declare | |
7478 | Err1 : Boolean; | |
7479 | ||
7480 | begin | |
7481 | Check_Returns | |
7482 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
7483 | ||
7484 | if Err1 then | |
7485 | Err := True; | |
7486 | end if; | |
7487 | ||
7488 | return; | |
7489 | end; | |
7490 | ||
7491 | -- Loop statement. If there is an iteration scheme, we can definitely | |
7492 | -- fall out of the loop. Similarly if there is an exit statement, we | |
7493 | -- can fall out. In either case we need a following return. | |
7494 | ||
7495 | elsif Kind = N_Loop_Statement then | |
7496 | if Present (Iteration_Scheme (Last_Stm)) | |
7497 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
7498 | then | |
7499 | null; | |
7500 | ||
f3d57416 RW |
7501 | -- A loop with no exit statement or iteration scheme is either |
7502 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
7503 | -- In either case, no warning is required. |
7504 | ||
7505 | else | |
7506 | return; | |
7507 | end if; | |
7508 | ||
7509 | -- Timed entry call, check entry call and delay alternatives | |
7510 | ||
7511 | -- Note: in expanded code, the timed entry call has been converted | |
7512 | -- to a set of expanded statements on which the check will work | |
7513 | -- correctly in any case. | |
7514 | ||
7515 | elsif Kind = N_Timed_Entry_Call then | |
7516 | declare | |
7517 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
7518 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
7519 | ||
7520 | begin | |
7521 | -- If statement sequence of entry call alternative is missing, | |
7522 | -- then we can definitely fall through, and we post the error | |
7523 | -- message on the entry call alternative itself. | |
7524 | ||
7525 | if No (Statements (ECA)) then | |
7526 | Last_Stm := ECA; | |
7527 | ||
7528 | -- If statement sequence of delay alternative is missing, then | |
7529 | -- we can definitely fall through, and we post the error | |
7530 | -- message on the delay alternative itself. | |
7531 | ||
7532 | -- Note: if both ECA and DCA are missing the return, then we | |
7533 | -- post only one message, should be enough to fix the bugs. | |
7534 | -- If not we will get a message next time on the DCA when the | |
a90bd866 | 7535 | -- ECA is fixed. |
996ae0b0 RK |
7536 | |
7537 | elsif No (Statements (DCA)) then | |
7538 | Last_Stm := DCA; | |
7539 | ||
7540 | -- Else check both statement sequences | |
7541 | ||
7542 | else | |
7543 | Check_Statement_Sequence (Statements (ECA)); | |
7544 | Check_Statement_Sequence (Statements (DCA)); | |
7545 | return; | |
7546 | end if; | |
7547 | end; | |
7548 | ||
7549 | -- Conditional entry call, check entry call and else part | |
7550 | ||
7551 | -- Note: in expanded code, the conditional entry call has been | |
7552 | -- converted to a set of expanded statements on which the check | |
7553 | -- will work correctly in any case. | |
7554 | ||
7555 | elsif Kind = N_Conditional_Entry_Call then | |
7556 | declare | |
7557 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
7558 | ||
7559 | begin | |
7560 | -- If statement sequence of entry call alternative is missing, | |
7561 | -- then we can definitely fall through, and we post the error | |
7562 | -- message on the entry call alternative itself. | |
7563 | ||
7564 | if No (Statements (ECA)) then | |
7565 | Last_Stm := ECA; | |
7566 | ||
7567 | -- Else check statement sequence and else part | |
7568 | ||
7569 | else | |
7570 | Check_Statement_Sequence (Statements (ECA)); | |
7571 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
7572 | return; | |
7573 | end if; | |
7574 | end; | |
7575 | end if; | |
7576 | ||
7577 | -- If we fall through, issue appropriate message | |
7578 | ||
7579 | if Mode = 'F' then | |
7b27e183 AC |
7580 | |
7581 | -- Kill warning if last statement is a raise exception call, | |
7582 | -- or a pragma Assert (False). Note that with assertions enabled, | |
7583 | -- such a pragma has been converted into a raise exception call | |
7584 | -- already, so the Assert_False is for the assertions off case. | |
7585 | ||
7586 | if not Raise_Exception_Call and then not Assert_False then | |
b465ef6f AC |
7587 | |
7588 | -- In GNATprove mode, it is an error to have a missing return | |
7589 | ||
43417b90 | 7590 | Error_Msg_Warn := SPARK_Mode /= On; |
7b27e183 AC |
7591 | |
7592 | -- Issue error message or warning | |
7593 | ||
4a28b181 AC |
7594 | Error_Msg_N |
7595 | ("RETURN statement missing following this statement<<!", | |
7596 | Last_Stm); | |
7597 | Error_Msg_N | |
7598 | ("\Program_Error ]<<!", Last_Stm); | |
996ae0b0 RK |
7599 | end if; |
7600 | ||
7601 | -- Note: we set Err even though we have not issued a warning | |
7602 | -- because we still have a case of a missing return. This is | |
7603 | -- an extremely marginal case, probably will never be noticed | |
7604 | -- but we might as well get it right. | |
7605 | ||
7606 | Err := True; | |
7607 | ||
c8ef728f ES |
7608 | -- Otherwise we have the case of a procedure marked No_Return |
7609 | ||
996ae0b0 | 7610 | else |
800621e0 | 7611 | if not Raise_Exception_Call then |
4a28b181 AC |
7612 | if GNATprove_Mode then |
7613 | Error_Msg_N | |
7614 | ("implied return after this statement " | |
7615 | & "would have raised Program_Error", Last_Stm); | |
7616 | else | |
7617 | Error_Msg_N | |
7618 | ("implied return after this statement " | |
7619 | & "will raise Program_Error??", Last_Stm); | |
7620 | end if; | |
7621 | ||
43417b90 | 7622 | Error_Msg_Warn := SPARK_Mode /= On; |
800621e0 | 7623 | Error_Msg_NE |
4a28b181 | 7624 | ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
800621e0 | 7625 | end if; |
c8ef728f ES |
7626 | |
7627 | declare | |
7628 | RE : constant Node_Id := | |
7629 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
7630 | Reason => PE_Implicit_Return); | |
7631 | begin | |
7632 | Insert_After (Last_Stm, RE); | |
7633 | Analyze (RE); | |
7634 | end; | |
996ae0b0 RK |
7635 | end if; |
7636 | end Check_Statement_Sequence; | |
7637 | ||
7638 | -- Start of processing for Check_Returns | |
7639 | ||
7640 | begin | |
7641 | Err := False; | |
7642 | Check_Statement_Sequence (Statements (HSS)); | |
7643 | ||
7644 | if Present (Exception_Handlers (HSS)) then | |
7645 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
7646 | while Present (Handler) loop | |
7647 | Check_Statement_Sequence (Statements (Handler)); | |
7648 | Next_Non_Pragma (Handler); | |
7649 | end loop; | |
7650 | end if; | |
7651 | end Check_Returns; | |
7652 | ||
7653 | ---------------------------- | |
7654 | -- Check_Subprogram_Order -- | |
7655 | ---------------------------- | |
7656 | ||
7657 | procedure Check_Subprogram_Order (N : Node_Id) is | |
7658 | ||
7659 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
7660 | -- This is used to check if S1 > S2 in the sense required by this test, |
7661 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 7662 | |
82c80734 RD |
7663 | ----------------------------- |
7664 | -- Subprogram_Name_Greater -- | |
7665 | ----------------------------- | |
7666 | ||
996ae0b0 RK |
7667 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
7668 | L1, L2 : Positive; | |
7669 | N1, N2 : Natural; | |
7670 | ||
7671 | begin | |
67336960 AC |
7672 | -- Deal with special case where names are identical except for a |
7673 | -- numerical suffix. These are handled specially, taking the numeric | |
7674 | -- ordering from the suffix into account. | |
996ae0b0 RK |
7675 | |
7676 | L1 := S1'Last; | |
7677 | while S1 (L1) in '0' .. '9' loop | |
7678 | L1 := L1 - 1; | |
7679 | end loop; | |
7680 | ||
7681 | L2 := S2'Last; | |
7682 | while S2 (L2) in '0' .. '9' loop | |
7683 | L2 := L2 - 1; | |
7684 | end loop; | |
7685 | ||
67336960 | 7686 | -- If non-numeric parts non-equal, do straight compare |
996ae0b0 | 7687 | |
67336960 AC |
7688 | if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
7689 | return S1 > S2; | |
996ae0b0 RK |
7690 | |
7691 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
7692 | -- that a missing suffix is treated as numeric zero in this test. | |
7693 | ||
7694 | else | |
7695 | N1 := 0; | |
7696 | while L1 < S1'Last loop | |
7697 | L1 := L1 + 1; | |
7698 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
7699 | end loop; | |
7700 | ||
7701 | N2 := 0; | |
7702 | while L2 < S2'Last loop | |
7703 | L2 := L2 + 1; | |
7704 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
7705 | end loop; | |
7706 | ||
7707 | return N1 > N2; | |
7708 | end if; | |
7709 | end Subprogram_Name_Greater; | |
7710 | ||
7711 | -- Start of processing for Check_Subprogram_Order | |
7712 | ||
7713 | begin | |
7714 | -- Check body in alpha order if this is option | |
7715 | ||
fbf5a39b | 7716 | if Style_Check |
bc202b70 | 7717 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
7718 | and then Nkind (N) = N_Subprogram_Body |
7719 | and then Comes_From_Source (N) | |
7720 | and then In_Extended_Main_Source_Unit (N) | |
7721 | then | |
7722 | declare | |
7723 | LSN : String_Ptr | |
7724 | renames Scope_Stack.Table | |
7725 | (Scope_Stack.Last).Last_Subprogram_Name; | |
7726 | ||
7727 | Body_Id : constant Entity_Id := | |
7728 | Defining_Entity (Specification (N)); | |
7729 | ||
7730 | begin | |
7731 | Get_Decoded_Name_String (Chars (Body_Id)); | |
7732 | ||
7733 | if LSN /= null then | |
7734 | if Subprogram_Name_Greater | |
7735 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
7736 | then | |
7737 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
7738 | end if; | |
7739 | ||
7740 | Free (LSN); | |
7741 | end if; | |
7742 | ||
7743 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
7744 | end; | |
7745 | end if; | |
7746 | end Check_Subprogram_Order; | |
7747 | ||
7748 | ------------------------------ | |
7749 | -- Check_Subtype_Conformant -- | |
7750 | ------------------------------ | |
7751 | ||
7752 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
7753 | (New_Id : Entity_Id; |
7754 | Old_Id : Entity_Id; | |
7755 | Err_Loc : Node_Id := Empty; | |
f307415a AC |
7756 | Skip_Controlling_Formals : Boolean := False; |
7757 | Get_Inst : Boolean := False) | |
996ae0b0 RK |
7758 | is |
7759 | Result : Boolean; | |
81db9d77 | 7760 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7761 | begin |
7762 | Check_Conformance | |
ce2b6ba5 | 7763 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
f307415a AC |
7764 | Skip_Controlling_Formals => Skip_Controlling_Formals, |
7765 | Get_Inst => Get_Inst); | |
996ae0b0 RK |
7766 | end Check_Subtype_Conformant; |
7767 | ||
7768 | --------------------------- | |
7769 | -- Check_Type_Conformant -- | |
7770 | --------------------------- | |
7771 | ||
7772 | procedure Check_Type_Conformant | |
7773 | (New_Id : Entity_Id; | |
7774 | Old_Id : Entity_Id; | |
7775 | Err_Loc : Node_Id := Empty) | |
7776 | is | |
7777 | Result : Boolean; | |
81db9d77 | 7778 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7779 | begin |
7780 | Check_Conformance | |
7781 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
7782 | end Check_Type_Conformant; | |
7783 | ||
806f6d37 AC |
7784 | --------------------------- |
7785 | -- Can_Override_Operator -- | |
7786 | --------------------------- | |
7787 | ||
7788 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
7789 | Typ : Entity_Id; | |
f146302c | 7790 | |
806f6d37 AC |
7791 | begin |
7792 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
7793 | return False; | |
7794 | ||
7795 | else | |
7796 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
7797 | ||
f146302c AC |
7798 | -- Check explicitly that the operation is a primitive of the type |
7799 | ||
806f6d37 | 7800 | return Operator_Matches_Spec (Subp, Subp) |
f146302c | 7801 | and then not Is_Generic_Type (Typ) |
806f6d37 AC |
7802 | and then Scope (Subp) = Scope (Typ) |
7803 | and then not Is_Class_Wide_Type (Typ); | |
7804 | end if; | |
7805 | end Can_Override_Operator; | |
7806 | ||
996ae0b0 RK |
7807 | ---------------------- |
7808 | -- Conforming_Types -- | |
7809 | ---------------------- | |
7810 | ||
7811 | function Conforming_Types | |
7812 | (T1 : Entity_Id; | |
7813 | T2 : Entity_Id; | |
7814 | Ctype : Conformance_Type; | |
d05ef0ab | 7815 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
7816 | is |
7817 | Type_1 : Entity_Id := T1; | |
7818 | Type_2 : Entity_Id := T2; | |
af4b9434 | 7819 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
7820 | |
7821 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
7822 | -- If neither T1 nor T2 are generic actual types, or if they are in |
7823 | -- different scopes (e.g. parent and child instances), then verify that | |
7824 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
7825 | -- subtype chain. The whole purpose of this procedure is to prevent | |
7826 | -- spurious ambiguities in an instantiation that may arise if two | |
7827 | -- distinct generic types are instantiated with the same actual. | |
7828 | ||
5d37ba92 ES |
7829 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
7830 | -- An access parameter can designate an incomplete type. If the | |
7831 | -- incomplete type is the limited view of a type from a limited_ | |
7832 | -- with_clause, check whether the non-limited view is available. If | |
7833 | -- it is a (non-limited) incomplete type, get the full view. | |
7834 | ||
0a36105d JM |
7835 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
7836 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
7837 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
7838 | -- with view of a type is used in a subprogram declaration and the | |
7839 | -- subprogram body is in the scope of a regular with clause for the | |
7840 | -- same unit. In such a case, the two type entities can be considered | |
7841 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
7842 | |
7843 | ---------------------- | |
7844 | -- Base_Types_Match -- | |
7845 | ---------------------- | |
7846 | ||
7847 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
8fde064e AC |
7848 | BT1 : constant Entity_Id := Base_Type (T1); |
7849 | BT2 : constant Entity_Id := Base_Type (T2); | |
7850 | ||
996ae0b0 RK |
7851 | begin |
7852 | if T1 = T2 then | |
7853 | return True; | |
7854 | ||
8fde064e | 7855 | elsif BT1 = BT2 then |
996ae0b0 | 7856 | |
0a36105d | 7857 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
7858 | -- check that the generic actual is an ancestor subtype of the |
7859 | -- other ???. | |
586ecbf3 | 7860 | |
70f4ad20 AC |
7861 | -- See code in Find_Corresponding_Spec that applies an additional |
7862 | -- filter to handle accidental amiguities in instances. | |
996ae0b0 RK |
7863 | |
7864 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
7865 | or else not Is_Generic_Actual_Type (T2) |
7866 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 7867 | |
8fde064e | 7868 | -- If T2 is a generic actual type it is declared as the subtype of |
2995860f AC |
7869 | -- the actual. If that actual is itself a subtype we need to use its |
7870 | -- own base type to check for compatibility. | |
8fde064e AC |
7871 | |
7872 | elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then | |
7873 | return True; | |
7874 | ||
7875 | elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then | |
7876 | return True; | |
7877 | ||
0a36105d JM |
7878 | else |
7879 | return False; | |
7880 | end if; | |
7881 | end Base_Types_Match; | |
aa720a54 | 7882 | |
5d37ba92 ES |
7883 | -------------------------- |
7884 | -- Find_Designated_Type -- | |
7885 | -------------------------- | |
7886 | ||
7887 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
7888 | Desig : Entity_Id; | |
7889 | ||
7890 | begin | |
7891 | Desig := Directly_Designated_Type (T); | |
7892 | ||
7893 | if Ekind (Desig) = E_Incomplete_Type then | |
7894 | ||
7895 | -- If regular incomplete type, get full view if available | |
7896 | ||
7897 | if Present (Full_View (Desig)) then | |
7898 | Desig := Full_View (Desig); | |
7899 | ||
7900 | -- If limited view of a type, get non-limited view if available, | |
7901 | -- and check again for a regular incomplete type. | |
7902 | ||
7903 | elsif Present (Non_Limited_View (Desig)) then | |
7904 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
7905 | end if; | |
7906 | end if; | |
7907 | ||
7908 | return Desig; | |
7909 | end Find_Designated_Type; | |
7910 | ||
0a36105d JM |
7911 | ------------------------------- |
7912 | -- Matches_Limited_With_View -- | |
7913 | ------------------------------- | |
7914 | ||
7915 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
7916 | begin | |
7917 | -- In some cases a type imported through a limited_with clause, and | |
7918 | -- its nonlimited view are both visible, for example in an anonymous | |
7919 | -- access-to-class-wide type in a formal. Both entities designate the | |
7920 | -- same type. | |
7921 | ||
7b56a91b | 7922 | if From_Limited_With (T1) and then T2 = Available_View (T1) then |
aa720a54 AC |
7923 | return True; |
7924 | ||
7b56a91b | 7925 | elsif From_Limited_With (T2) and then T1 = Available_View (T2) then |
41251c60 | 7926 | return True; |
3e24afaa | 7927 | |
7b56a91b AC |
7928 | elsif From_Limited_With (T1) |
7929 | and then From_Limited_With (T2) | |
3e24afaa AC |
7930 | and then Available_View (T1) = Available_View (T2) |
7931 | then | |
7932 | return True; | |
41251c60 | 7933 | |
996ae0b0 RK |
7934 | else |
7935 | return False; | |
7936 | end if; | |
0a36105d | 7937 | end Matches_Limited_With_View; |
996ae0b0 | 7938 | |
ec4867fa | 7939 | -- Start of processing for Conforming_Types |
758c442c | 7940 | |
996ae0b0 | 7941 | begin |
8fde064e AC |
7942 | -- The context is an instance association for a formal access-to- |
7943 | -- subprogram type; the formal parameter types require mapping because | |
7944 | -- they may denote other formal parameters of the generic unit. | |
996ae0b0 RK |
7945 | |
7946 | if Get_Inst then | |
7947 | Type_1 := Get_Instance_Of (T1); | |
7948 | Type_2 := Get_Instance_Of (T2); | |
7949 | end if; | |
7950 | ||
0a36105d JM |
7951 | -- If one of the types is a view of the other introduced by a limited |
7952 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 7953 | |
0a36105d JM |
7954 | if Matches_Limited_With_View (T1, T2) then |
7955 | return True; | |
7956 | ||
7957 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
7958 | return Ctype <= Mode_Conformant |
7959 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
7960 | ||
7961 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
7962 | and then Present (Full_View (Type_1)) | |
7963 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
7964 | then | |
7965 | return Ctype <= Mode_Conformant | |
7966 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
7967 | ||
7968 | elsif Ekind (Type_2) = E_Incomplete_Type | |
7969 | and then Present (Full_View (Type_2)) | |
7970 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7971 | then | |
7972 | return Ctype <= Mode_Conformant | |
7973 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
7974 | |
7975 | elsif Is_Private_Type (Type_2) | |
7976 | and then In_Instance | |
7977 | and then Present (Full_View (Type_2)) | |
7978 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7979 | then | |
7980 | return Ctype <= Mode_Conformant | |
7981 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
996ae0b0 RK |
7982 | end if; |
7983 | ||
0a36105d | 7984 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
466c2127 AC |
7985 | -- treated recursively because they carry a signature. As far as |
7986 | -- conformance is concerned, convention plays no role, and either | |
7987 | -- or both could be access to protected subprograms. | |
af4b9434 AC |
7988 | |
7989 | Are_Anonymous_Access_To_Subprogram_Types := | |
466c2127 AC |
7990 | Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
7991 | E_Anonymous_Access_Protected_Subprogram_Type) | |
f937473f | 7992 | and then |
466c2127 AC |
7993 | Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
7994 | E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 7995 | |
996ae0b0 | 7996 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
7997 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
7998 | -- the base types because we may have built internal subtype entities | |
7999 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 8000 | |
5d37ba92 ES |
8001 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
8002 | and then | |
8003 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
8fde064e AC |
8004 | |
8005 | -- Ada 2005 (AI-254) | |
8006 | ||
8007 | or else Are_Anonymous_Access_To_Subprogram_Types | |
996ae0b0 RK |
8008 | then |
8009 | declare | |
8010 | Desig_1 : Entity_Id; | |
8011 | Desig_2 : Entity_Id; | |
8012 | ||
8013 | begin | |
885c4871 | 8014 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 8015 | -- subtype conformance. |
9dcb52e1 | 8016 | |
0791fbe9 | 8017 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
8018 | and then Ctype >= Subtype_Conformant |
8019 | and then | |
8020 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
8021 | then | |
8022 | return False; | |
996ae0b0 RK |
8023 | end if; |
8024 | ||
5d37ba92 | 8025 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 8026 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 8027 | |
5d37ba92 | 8028 | -- If the context is an instance association for a formal |
82c80734 RD |
8029 | -- access-to-subprogram type; formal access parameter designated |
8030 | -- types require mapping because they may denote other formal | |
8031 | -- parameters of the generic unit. | |
996ae0b0 RK |
8032 | |
8033 | if Get_Inst then | |
8034 | Desig_1 := Get_Instance_Of (Desig_1); | |
8035 | Desig_2 := Get_Instance_Of (Desig_2); | |
8036 | end if; | |
8037 | ||
82c80734 RD |
8038 | -- It is possible for a Class_Wide_Type to be introduced for an |
8039 | -- incomplete type, in which case there is a separate class_ wide | |
8040 | -- type for the full view. The types conform if their Etypes | |
8041 | -- conform, i.e. one may be the full view of the other. This can | |
8042 | -- only happen in the context of an access parameter, other uses | |
8043 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 8044 | |
fbf5a39b | 8045 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
8046 | and then |
8047 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
8048 | then |
8049 | return | |
fbf5a39b AC |
8050 | Conforming_Types |
8051 | (Etype (Base_Type (Desig_1)), | |
8052 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
8053 | |
8054 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 8055 | if Ada_Version < Ada_2005 then |
758c442c GD |
8056 | return Ctype = Type_Conformant |
8057 | or else | |
af4b9434 AC |
8058 | Subtypes_Statically_Match (Desig_1, Desig_2); |
8059 | ||
758c442c GD |
8060 | -- We must check the conformance of the signatures themselves |
8061 | ||
8062 | else | |
8063 | declare | |
8064 | Conformant : Boolean; | |
8065 | begin | |
8066 | Check_Conformance | |
8067 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
8068 | return Conformant; | |
8069 | end; | |
8070 | end if; | |
8071 | ||
996ae0b0 RK |
8072 | else |
8073 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
8074 | and then (Ctype = Type_Conformant | |
8fde064e AC |
8075 | or else |
8076 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
8077 | end if; |
8078 | end; | |
8079 | ||
8080 | -- Otherwise definitely no match | |
8081 | ||
8082 | else | |
c8ef728f ES |
8083 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
8084 | and then Is_Access_Type (Type_2)) | |
8085 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
8fde064e | 8086 | and then Is_Access_Type (Type_1))) |
c8ef728f ES |
8087 | and then |
8088 | Conforming_Types | |
8089 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
8090 | then | |
8091 | May_Hide_Profile := True; | |
8092 | end if; | |
8093 | ||
996ae0b0 RK |
8094 | return False; |
8095 | end if; | |
996ae0b0 RK |
8096 | end Conforming_Types; |
8097 | ||
8098 | -------------------------- | |
8099 | -- Create_Extra_Formals -- | |
8100 | -------------------------- | |
8101 | ||
8102 | procedure Create_Extra_Formals (E : Entity_Id) is | |
8103 | Formal : Entity_Id; | |
ec4867fa | 8104 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
8105 | Last_Extra : Entity_Id; |
8106 | Formal_Type : Entity_Id; | |
8107 | P_Formal : Entity_Id := Empty; | |
8108 | ||
ec4867fa ES |
8109 | function Add_Extra_Formal |
8110 | (Assoc_Entity : Entity_Id; | |
8111 | Typ : Entity_Id; | |
8112 | Scope : Entity_Id; | |
8113 | Suffix : String) return Entity_Id; | |
8114 | -- Add an extra formal to the current list of formals and extra formals. | |
8115 | -- The extra formal is added to the end of the list of extra formals, | |
8116 | -- and also returned as the result. These formals are always of mode IN. | |
8117 | -- The new formal has the type Typ, is declared in Scope, and its name | |
8118 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
8119 | -- The following suffixes are currently used. They should not be changed |
8120 | -- without coordinating with CodePeer, which makes use of these to | |
8121 | -- provide better messages. | |
8122 | ||
d92eccc3 AC |
8123 | -- O denotes the Constrained bit. |
8124 | -- L denotes the accessibility level. | |
cd5a9750 AC |
8125 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
8126 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 8127 | |
fbf5a39b AC |
8128 | ---------------------- |
8129 | -- Add_Extra_Formal -- | |
8130 | ---------------------- | |
8131 | ||
ec4867fa ES |
8132 | function Add_Extra_Formal |
8133 | (Assoc_Entity : Entity_Id; | |
8134 | Typ : Entity_Id; | |
8135 | Scope : Entity_Id; | |
8136 | Suffix : String) return Entity_Id | |
8137 | is | |
996ae0b0 | 8138 | EF : constant Entity_Id := |
ec4867fa ES |
8139 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
8140 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 8141 | Suffix => Suffix)); |
996ae0b0 RK |
8142 | |
8143 | begin | |
82c80734 RD |
8144 | -- A little optimization. Never generate an extra formal for the |
8145 | -- _init operand of an initialization procedure, since it could | |
8146 | -- never be used. | |
996ae0b0 RK |
8147 | |
8148 | if Chars (Formal) = Name_uInit then | |
8149 | return Empty; | |
8150 | end if; | |
8151 | ||
8152 | Set_Ekind (EF, E_In_Parameter); | |
8153 | Set_Actual_Subtype (EF, Typ); | |
8154 | Set_Etype (EF, Typ); | |
ec4867fa | 8155 | Set_Scope (EF, Scope); |
996ae0b0 RK |
8156 | Set_Mechanism (EF, Default_Mechanism); |
8157 | Set_Formal_Validity (EF); | |
8158 | ||
ec4867fa ES |
8159 | if No (First_Extra) then |
8160 | First_Extra := EF; | |
8161 | Set_Extra_Formals (Scope, First_Extra); | |
8162 | end if; | |
8163 | ||
8164 | if Present (Last_Extra) then | |
8165 | Set_Extra_Formal (Last_Extra, EF); | |
8166 | end if; | |
8167 | ||
996ae0b0 | 8168 | Last_Extra := EF; |
ec4867fa | 8169 | |
996ae0b0 RK |
8170 | return EF; |
8171 | end Add_Extra_Formal; | |
8172 | ||
8173 | -- Start of processing for Create_Extra_Formals | |
8174 | ||
8175 | begin | |
8fde064e AC |
8176 | -- We never generate extra formals if expansion is not active because we |
8177 | -- don't need them unless we are generating code. | |
f937473f RD |
8178 | |
8179 | if not Expander_Active then | |
8180 | return; | |
8181 | end if; | |
8182 | ||
e2441021 AC |
8183 | -- No need to generate extra formals in interface thunks whose target |
8184 | -- primitive has no extra formals. | |
8185 | ||
8186 | if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then | |
8187 | return; | |
8188 | end if; | |
8189 | ||
82c80734 | 8190 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 8191 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 8192 | -- for extra formals. |
996ae0b0 RK |
8193 | |
8194 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
8195 | P_Formal := First_Formal (Alias (E)); | |
8196 | end if; | |
8197 | ||
8198 | Last_Extra := Empty; | |
8199 | Formal := First_Formal (E); | |
8200 | while Present (Formal) loop | |
8201 | Last_Extra := Formal; | |
8202 | Next_Formal (Formal); | |
8203 | end loop; | |
8204 | ||
f937473f | 8205 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
8206 | -- situation may arise for subprogram types created as part of |
8207 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 | 8208 | |
8fde064e | 8209 | if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
996ae0b0 RK |
8210 | return; |
8211 | end if; | |
8212 | ||
19590d70 GD |
8213 | -- If the subprogram is a predefined dispatching subprogram then don't |
8214 | -- generate any extra constrained or accessibility level formals. In | |
8215 | -- general we suppress these for internal subprograms (by not calling | |
8216 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
8217 | -- generated stream attributes do get passed through because extra | |
8218 | -- build-in-place formals are needed in some cases (limited 'Input). | |
8219 | ||
bac7206d | 8220 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 8221 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
8222 | end if; |
8223 | ||
996ae0b0 | 8224 | Formal := First_Formal (E); |
996ae0b0 RK |
8225 | while Present (Formal) loop |
8226 | ||
8227 | -- Create extra formal for supporting the attribute 'Constrained. | |
8228 | -- The case of a private type view without discriminants also | |
8229 | -- requires the extra formal if the underlying type has defaulted | |
8230 | -- discriminants. | |
8231 | ||
8232 | if Ekind (Formal) /= E_In_Parameter then | |
8233 | if Present (P_Formal) then | |
8234 | Formal_Type := Etype (P_Formal); | |
8235 | else | |
8236 | Formal_Type := Etype (Formal); | |
8237 | end if; | |
8238 | ||
5d09245e AC |
8239 | -- Do not produce extra formals for Unchecked_Union parameters. |
8240 | -- Jump directly to the end of the loop. | |
8241 | ||
8242 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
8243 | goto Skip_Extra_Formal_Generation; | |
8244 | end if; | |
8245 | ||
996ae0b0 RK |
8246 | if not Has_Discriminants (Formal_Type) |
8247 | and then Ekind (Formal_Type) in Private_Kind | |
8248 | and then Present (Underlying_Type (Formal_Type)) | |
8249 | then | |
8250 | Formal_Type := Underlying_Type (Formal_Type); | |
8251 | end if; | |
8252 | ||
5e5db3b4 GD |
8253 | -- Suppress the extra formal if formal's subtype is constrained or |
8254 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
8255 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
8256 | -- can have defaulted discriminants, but 'Constrained is required | |
8257 | -- to return True, so the formal is never needed (see AI05-0214). | |
8258 | -- Note that this ensures consistency of calling sequences for | |
8259 | -- dispatching operations when some types in a class have defaults | |
8260 | -- on discriminants and others do not (and requiring the extra | |
8261 | -- formal would introduce distributed overhead). | |
8262 | ||
b5bdffcc AC |
8263 | -- If the type does not have a completion yet, treat as prior to |
8264 | -- Ada 2012 for consistency. | |
8265 | ||
996ae0b0 | 8266 | if Has_Discriminants (Formal_Type) |
f937473f RD |
8267 | and then not Is_Constrained (Formal_Type) |
8268 | and then not Is_Indefinite_Subtype (Formal_Type) | |
5e5db3b4 | 8269 | and then (Ada_Version < Ada_2012 |
b5bdffcc AC |
8270 | or else No (Underlying_Type (Formal_Type)) |
8271 | or else not | |
8272 | (Is_Limited_Type (Formal_Type) | |
8273 | and then | |
8274 | (Is_Tagged_Type | |
8275 | (Underlying_Type (Formal_Type))))) | |
996ae0b0 RK |
8276 | then |
8277 | Set_Extra_Constrained | |
d92eccc3 | 8278 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
8279 | end if; |
8280 | end if; | |
8281 | ||
0a36105d JM |
8282 | -- Create extra formal for supporting accessibility checking. This |
8283 | -- is done for both anonymous access formals and formals of named | |
8284 | -- access types that are marked as controlling formals. The latter | |
8285 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
8286 | -- type and substitutes the types of access-to-class-wide actuals | |
8287 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
8288 | -- Base_Type is applied because in cases where there is a null |
8289 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
8290 | |
8291 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 8292 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
8293 | -- package in which it resides. However, we do not suppress it |
8294 | -- simply if the scope has accessibility checks suppressed, since | |
8295 | -- this could cause trouble when clients are compiled with a | |
8296 | -- different suppression setting. The explicit checks at the | |
8297 | -- package level are safe from this point of view. | |
996ae0b0 | 8298 | |
5d37ba92 | 8299 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 8300 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 8301 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 8302 | and then not |
fbf5a39b | 8303 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 8304 | or else |
fbf5a39b | 8305 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 8306 | and then |
c8ef728f | 8307 | (No (P_Formal) |
996ae0b0 RK |
8308 | or else Present (Extra_Accessibility (P_Formal))) |
8309 | then | |
811c6a85 | 8310 | Set_Extra_Accessibility |
d92eccc3 | 8311 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
8312 | end if; |
8313 | ||
5d09245e AC |
8314 | -- This label is required when skipping extra formal generation for |
8315 | -- Unchecked_Union parameters. | |
8316 | ||
8317 | <<Skip_Extra_Formal_Generation>> | |
8318 | ||
f937473f RD |
8319 | if Present (P_Formal) then |
8320 | Next_Formal (P_Formal); | |
8321 | end if; | |
8322 | ||
996ae0b0 RK |
8323 | Next_Formal (Formal); |
8324 | end loop; | |
ec4867fa | 8325 | |
63585f75 SB |
8326 | <<Test_For_Func_Result_Extras>> |
8327 | ||
8328 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
8329 | -- function call is ... determined by the point of call ...". | |
8330 | ||
8331 | if Needs_Result_Accessibility_Level (E) then | |
8332 | Set_Extra_Accessibility_Of_Result | |
8333 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
8334 | end if; | |
19590d70 | 8335 | |
ec4867fa | 8336 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
8337 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
8338 | ||
0791fbe9 | 8339 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 8340 | declare |
f937473f | 8341 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 8342 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 8343 | Formal_Typ : Entity_Id; |
f937473f | 8344 | |
2fcc44fa | 8345 | Discard : Entity_Id; |
f937473f | 8346 | pragma Warnings (Off, Discard); |
ec4867fa ES |
8347 | |
8348 | begin | |
f937473f | 8349 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
8350 | -- add a 4-state formal indicating whether the return object is |
8351 | -- allocated by the caller (1), or should be allocated by the | |
8352 | -- callee on the secondary stack (2), in the global heap (3), or | |
8353 | -- in a user-defined storage pool (4). For the moment we just use | |
8354 | -- Natural for the type of this formal. Note that this formal | |
8355 | -- isn't usually needed in the case where the result subtype is | |
8356 | -- constrained, but it is needed when the function has a tagged | |
8357 | -- result, because generally such functions can be called in a | |
8358 | -- dispatching context and such calls must be handled like calls | |
8359 | -- to a class-wide function. | |
0a36105d | 8360 | |
1bb6e262 | 8361 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
8362 | Discard := |
8363 | Add_Extra_Formal | |
8364 | (E, Standard_Natural, | |
8365 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 8366 | |
8417f4b2 | 8367 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 AC |
8368 | -- use a user-defined pool. This formal is not added on |
8369 | -- .NET/JVM/ZFP as those targets do not support pools. | |
200b7162 | 8370 | |
ea10ca9c AC |
8371 | if VM_Target = No_VM |
8372 | and then RTE_Available (RE_Root_Storage_Pool_Ptr) | |
3e452820 | 8373 | then |
8417f4b2 AC |
8374 | Discard := |
8375 | Add_Extra_Formal | |
8376 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
8377 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
8378 | end if; | |
f937473f | 8379 | end if; |
ec4867fa | 8380 | |
df3e68b1 | 8381 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 8382 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 8383 | |
ca5af305 | 8384 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
8385 | Discard := |
8386 | Add_Extra_Formal | |
ca5af305 AC |
8387 | (E, RTE (RE_Finalization_Master_Ptr), |
8388 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
8389 | end if; |
8390 | ||
94bbf008 AC |
8391 | -- When the result type contains tasks, add two extra formals: the |
8392 | -- master of the tasks to be created, and the caller's activation | |
8393 | -- chain. | |
f937473f | 8394 | |
1a36a0cd | 8395 | if Has_Task (Full_Subt) then |
f937473f RD |
8396 | Discard := |
8397 | Add_Extra_Formal | |
8398 | (E, RTE (RE_Master_Id), | |
af89615f | 8399 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
8400 | Discard := |
8401 | Add_Extra_Formal | |
8402 | (E, RTE (RE_Activation_Chain_Access), | |
8403 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
8404 | end if; | |
ec4867fa | 8405 | |
f937473f RD |
8406 | -- All build-in-place functions get an extra formal that will be |
8407 | -- passed the address of the return object within the caller. | |
ec4867fa | 8408 | |
1a36a0cd AC |
8409 | Formal_Typ := |
8410 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 8411 | |
1a36a0cd AC |
8412 | Set_Directly_Designated_Type (Formal_Typ, Result_Subt); |
8413 | Set_Etype (Formal_Typ, Formal_Typ); | |
8414 | Set_Depends_On_Private | |
8415 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
8416 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
8417 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 8418 | |
1a36a0cd AC |
8419 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
8420 | -- the designated type comes from the limited view (for back-end | |
8421 | -- purposes). | |
ec4867fa | 8422 | |
7b56a91b AC |
8423 | Set_From_Limited_With |
8424 | (Formal_Typ, From_Limited_With (Result_Subt)); | |
f937473f | 8425 | |
1a36a0cd AC |
8426 | Layout_Type (Formal_Typ); |
8427 | ||
8428 | Discard := | |
8429 | Add_Extra_Formal | |
8430 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
8431 | end; |
8432 | end if; | |
996ae0b0 RK |
8433 | end Create_Extra_Formals; |
8434 | ||
8435 | ----------------------------- | |
8436 | -- Enter_Overloaded_Entity -- | |
8437 | ----------------------------- | |
8438 | ||
8439 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
8440 | E : Entity_Id := Current_Entity_In_Scope (S); | |
8441 | C_E : Entity_Id := Current_Entity (S); | |
8442 | ||
8443 | begin | |
8444 | if Present (E) then | |
8445 | Set_Has_Homonym (E); | |
8446 | Set_Has_Homonym (S); | |
8447 | end if; | |
8448 | ||
8449 | Set_Is_Immediately_Visible (S); | |
8450 | Set_Scope (S, Current_Scope); | |
8451 | ||
8452 | -- Chain new entity if front of homonym in current scope, so that | |
8453 | -- homonyms are contiguous. | |
8454 | ||
8fde064e | 8455 | if Present (E) and then E /= C_E then |
996ae0b0 RK |
8456 | while Homonym (C_E) /= E loop |
8457 | C_E := Homonym (C_E); | |
8458 | end loop; | |
8459 | ||
8460 | Set_Homonym (C_E, S); | |
8461 | ||
8462 | else | |
8463 | E := C_E; | |
8464 | Set_Current_Entity (S); | |
8465 | end if; | |
8466 | ||
8467 | Set_Homonym (S, E); | |
8468 | ||
2352eadb AC |
8469 | if Is_Inherited_Operation (S) then |
8470 | Append_Inherited_Subprogram (S); | |
8471 | else | |
8472 | Append_Entity (S, Current_Scope); | |
8473 | end if; | |
8474 | ||
996ae0b0 RK |
8475 | Set_Public_Status (S); |
8476 | ||
8477 | if Debug_Flag_E then | |
8478 | Write_Str ("New overloaded entity chain: "); | |
8479 | Write_Name (Chars (S)); | |
996ae0b0 | 8480 | |
82c80734 | 8481 | E := S; |
996ae0b0 RK |
8482 | while Present (E) loop |
8483 | Write_Str (" "); Write_Int (Int (E)); | |
8484 | E := Homonym (E); | |
8485 | end loop; | |
8486 | ||
8487 | Write_Eol; | |
8488 | end if; | |
8489 | ||
8490 | -- Generate warning for hiding | |
8491 | ||
8492 | if Warn_On_Hiding | |
8493 | and then Comes_From_Source (S) | |
8494 | and then In_Extended_Main_Source_Unit (S) | |
8495 | then | |
8496 | E := S; | |
8497 | loop | |
8498 | E := Homonym (E); | |
8499 | exit when No (E); | |
8500 | ||
7fc53871 AC |
8501 | -- Warn unless genuine overloading. Do not emit warning on |
8502 | -- hiding predefined operators in Standard (these are either an | |
8503 | -- (artifact of our implicit declarations, or simple noise) but | |
8504 | -- keep warning on a operator defined on a local subtype, because | |
8505 | -- of the real danger that different operators may be applied in | |
8506 | -- various parts of the program. | |
996ae0b0 | 8507 | |
1f250383 AC |
8508 | -- Note that if E and S have the same scope, there is never any |
8509 | -- hiding. Either the two conflict, and the program is illegal, | |
8510 | -- or S is overriding an implicit inherited subprogram. | |
8511 | ||
8512 | if Scope (E) /= Scope (S) | |
8513 | and then (not Is_Overloadable (E) | |
8d606a78 | 8514 | or else Subtype_Conformant (E, S)) |
f937473f RD |
8515 | and then (Is_Immediately_Visible (E) |
8516 | or else | |
8517 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 8518 | then |
7fc53871 AC |
8519 | if Scope (E) /= Standard_Standard then |
8520 | Error_Msg_Sloc := Sloc (E); | |
dbfeb4fa | 8521 | Error_Msg_N ("declaration of & hides one#?h?", S); |
7fc53871 AC |
8522 | |
8523 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
8524 | and then | |
1f250383 | 8525 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
8526 | then |
8527 | Error_Msg_N | |
dbfeb4fa | 8528 | ("declaration of & hides predefined operator?h?", S); |
7fc53871 | 8529 | end if; |
996ae0b0 RK |
8530 | end if; |
8531 | end loop; | |
8532 | end if; | |
8533 | end Enter_Overloaded_Entity; | |
8534 | ||
e5a58fac AC |
8535 | ----------------------------- |
8536 | -- Check_Untagged_Equality -- | |
8537 | ----------------------------- | |
8538 | ||
8539 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
8540 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
8541 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
8542 | Obj_Decl : Node_Id; | |
8543 | ||
8544 | begin | |
b2834fbd AC |
8545 | -- This check applies only if we have a subprogram declaration with a |
8546 | -- non-tagged record type. | |
8547 | ||
8548 | if Nkind (Decl) /= N_Subprogram_Declaration | |
8549 | or else not Is_Record_Type (Typ) | |
8550 | or else Is_Tagged_Type (Typ) | |
e5a58fac | 8551 | then |
b2834fbd AC |
8552 | return; |
8553 | end if; | |
e5a58fac | 8554 | |
b2834fbd AC |
8555 | -- In Ada 2012 case, we will output errors or warnings depending on |
8556 | -- the setting of debug flag -gnatd.E. | |
8557 | ||
8558 | if Ada_Version >= Ada_2012 then | |
8559 | Error_Msg_Warn := Debug_Flag_Dot_EE; | |
8560 | ||
8561 | -- In earlier versions of Ada, nothing to do unless we are warning on | |
8562 | -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). | |
8563 | ||
8564 | else | |
8565 | if not Warn_On_Ada_2012_Compatibility then | |
8566 | return; | |
8567 | end if; | |
8568 | end if; | |
8569 | ||
8570 | -- Cases where the type has already been frozen | |
e5a58fac | 8571 | |
b2834fbd AC |
8572 | if Is_Frozen (Typ) then |
8573 | ||
8574 | -- If the type is not declared in a package, or if we are in the body | |
8575 | -- of the package or in some other scope, the new operation is not | |
8576 | -- primitive, and therefore legal, though suspicious. Should we | |
8577 | -- generate a warning in this case ??? | |
8578 | ||
8579 | if Ekind (Scope (Typ)) /= E_Package | |
8580 | or else Scope (Typ) /= Current_Scope | |
8581 | then | |
8582 | return; | |
8583 | ||
8584 | -- If the type is a generic actual (sub)type, the operation is not | |
8585 | -- primitive either because the base type is declared elsewhere. | |
8586 | ||
8587 | elsif Is_Generic_Actual_Type (Typ) then | |
8588 | return; | |
8589 | ||
8590 | -- Here we have a definite error of declaration after freezing | |
8591 | ||
8592 | else | |
8593 | if Ada_Version >= Ada_2012 then | |
ae6ede77 | 8594 | Error_Msg_NE |
b2834fbd AC |
8595 | ("equality operator must be declared before type& is " |
8596 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); | |
8597 | ||
8598 | -- In Ada 2012 mode with error turned to warning, output one | |
8599 | -- more warning to warn that the equality operation may not | |
8600 | -- compose. This is the consequence of ignoring the error. | |
8601 | ||
8602 | if Error_Msg_Warn then | |
8603 | Error_Msg_N ("\equality operation may not compose??", Eq_Op); | |
8604 | end if; | |
21a5b575 AC |
8605 | |
8606 | else | |
8607 | Error_Msg_NE | |
b2834fbd AC |
8608 | ("equality operator must be declared before type& is " |
8609 | & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); | |
8610 | end if; | |
8611 | ||
8612 | -- If we are in the package body, we could just move the | |
8613 | -- declaration to the package spec, so add a message saying that. | |
8614 | ||
8615 | if In_Package_Body (Scope (Typ)) then | |
8616 | if Ada_Version >= Ada_2012 then | |
8617 | Error_Msg_N | |
8618 | ("\move declaration to package spec<<", Eq_Op); | |
8619 | else | |
8620 | Error_Msg_N | |
8621 | ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); | |
8622 | end if; | |
21a5b575 | 8623 | |
b2834fbd AC |
8624 | -- Otherwise try to find the freezing point |
8625 | ||
8626 | else | |
21a5b575 | 8627 | Obj_Decl := Next (Parent (Typ)); |
dbfeb4fa | 8628 | while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
21a5b575 AC |
8629 | if Nkind (Obj_Decl) = N_Object_Declaration |
8630 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
8631 | then | |
b2834fbd AC |
8632 | -- Freezing point, output warnings |
8633 | ||
8634 | if Ada_Version >= Ada_2012 then | |
8635 | Error_Msg_NE | |
8636 | ("type& is frozen by declaration??", Obj_Decl, Typ); | |
8637 | Error_Msg_N | |
8638 | ("\an equality operator cannot be declared after " | |
8639 | & "this point??", | |
8640 | Obj_Decl); | |
8641 | else | |
8642 | Error_Msg_NE | |
8643 | ("type& is frozen by declaration (Ada 2012)?y?", | |
8644 | Obj_Decl, Typ); | |
8645 | Error_Msg_N | |
8646 | ("\an equality operator cannot be declared after " | |
8647 | & "this point (Ada 2012)?y?", | |
8648 | Obj_Decl); | |
8649 | end if; | |
8650 | ||
21a5b575 AC |
8651 | exit; |
8652 | end if; | |
8653 | ||
8654 | Next (Obj_Decl); | |
8655 | end loop; | |
8656 | end if; | |
b2834fbd | 8657 | end if; |
e5a58fac | 8658 | |
b2834fbd AC |
8659 | -- Here if type is not frozen yet. It is illegal to have a primitive |
8660 | -- equality declared in the private part if the type is visible. | |
21a5b575 | 8661 | |
b2834fbd AC |
8662 | elsif not In_Same_List (Parent (Typ), Decl) |
8663 | and then not Is_Limited_Type (Typ) | |
8664 | then | |
8665 | -- Shouldn't we give an RM reference here??? | |
21a5b575 | 8666 | |
b2834fbd AC |
8667 | if Ada_Version >= Ada_2012 then |
8668 | Error_Msg_N | |
8669 | ("equality operator appears too late<<", Eq_Op); | |
8670 | else | |
8671 | Error_Msg_N | |
8672 | ("equality operator appears too late (Ada 2012)?y?", Eq_Op); | |
e5a58fac | 8673 | end if; |
b2834fbd AC |
8674 | |
8675 | -- No error detected | |
8676 | ||
8677 | else | |
8678 | return; | |
e5a58fac AC |
8679 | end if; |
8680 | end Check_Untagged_Equality; | |
8681 | ||
996ae0b0 RK |
8682 | ----------------------------- |
8683 | -- Find_Corresponding_Spec -- | |
8684 | ----------------------------- | |
8685 | ||
d44202ba HK |
8686 | function Find_Corresponding_Spec |
8687 | (N : Node_Id; | |
8688 | Post_Error : Boolean := True) return Entity_Id | |
8689 | is | |
996ae0b0 RK |
8690 | Spec : constant Node_Id := Specification (N); |
8691 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
8692 | ||
8693 | E : Entity_Id; | |
8694 | ||
70f4ad20 AC |
8695 | function Different_Generic_Profile (E : Entity_Id) return Boolean; |
8696 | -- Even if fully conformant, a body may depend on a generic actual when | |
8697 | -- the spec does not, or vice versa, in which case they were distinct | |
8698 | -- entities in the generic. | |
8699 | ||
8700 | ------------------------------- | |
8701 | -- Different_Generic_Profile -- | |
8702 | ------------------------------- | |
8703 | ||
8704 | function Different_Generic_Profile (E : Entity_Id) return Boolean is | |
8705 | F1, F2 : Entity_Id; | |
8706 | ||
2995860f AC |
8707 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
8708 | -- Check that the types of corresponding formals have the same | |
8709 | -- generic actual if any. We have to account for subtypes of a | |
8710 | -- generic formal, declared between a spec and a body, which may | |
8711 | -- appear distinct in an instance but matched in the generic. | |
8712 | ||
8713 | ------------------------- | |
8714 | -- Same_Generic_Actual -- | |
8715 | ------------------------- | |
8716 | ||
8717 | function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is | |
8718 | begin | |
8719 | return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) | |
8720 | or else | |
8721 | (Present (Parent (T1)) | |
8722 | and then Comes_From_Source (Parent (T1)) | |
8723 | and then Nkind (Parent (T1)) = N_Subtype_Declaration | |
8724 | and then Is_Entity_Name (Subtype_Indication (Parent (T1))) | |
8725 | and then Entity (Subtype_Indication (Parent (T1))) = T2); | |
8726 | end Same_Generic_Actual; | |
8727 | ||
8728 | -- Start of processing for Different_Generic_Profile | |
8729 | ||
70f4ad20 | 8730 | begin |
2995860f AC |
8731 | if not In_Instance then |
8732 | return False; | |
8733 | ||
8734 | elsif Ekind (E) = E_Function | |
8735 | and then not Same_Generic_Actual (Etype (E), Etype (Designator)) | |
70f4ad20 AC |
8736 | then |
8737 | return True; | |
8738 | end if; | |
8739 | ||
8740 | F1 := First_Formal (Designator); | |
8741 | F2 := First_Formal (E); | |
70f4ad20 | 8742 | while Present (F1) loop |
2995860f | 8743 | if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
70f4ad20 AC |
8744 | return True; |
8745 | end if; | |
8746 | ||
8747 | Next_Formal (F1); | |
8748 | Next_Formal (F2); | |
8749 | end loop; | |
8750 | ||
8751 | return False; | |
8752 | end Different_Generic_Profile; | |
8753 | ||
8754 | -- Start of processing for Find_Corresponding_Spec | |
8755 | ||
996ae0b0 RK |
8756 | begin |
8757 | E := Current_Entity (Designator); | |
996ae0b0 RK |
8758 | while Present (E) loop |
8759 | ||
8760 | -- We are looking for a matching spec. It must have the same scope, | |
8761 | -- and the same name, and either be type conformant, or be the case | |
8762 | -- of a library procedure spec and its body (which belong to one | |
8763 | -- another regardless of whether they are type conformant or not). | |
8764 | ||
8765 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
8766 | if Current_Scope = Standard_Standard |
8767 | or else (Ekind (E) = Ekind (Designator) | |
586ecbf3 | 8768 | and then Type_Conformant (E, Designator)) |
996ae0b0 RK |
8769 | then |
8770 | -- Within an instantiation, we know that spec and body are | |
70f4ad20 AC |
8771 | -- subtype conformant, because they were subtype conformant in |
8772 | -- the generic. We choose the subtype-conformant entity here as | |
8773 | -- well, to resolve spurious ambiguities in the instance that | |
8774 | -- were not present in the generic (i.e. when two different | |
8775 | -- types are given the same actual). If we are looking for a | |
8776 | -- spec to match a body, full conformance is expected. | |
996ae0b0 RK |
8777 | |
8778 | if In_Instance then | |
8779 | Set_Convention (Designator, Convention (E)); | |
8780 | ||
0187b60e AC |
8781 | -- Skip past subprogram bodies and subprogram renamings that |
8782 | -- may appear to have a matching spec, but that aren't fully | |
8783 | -- conformant with it. That can occur in cases where an | |
8784 | -- actual type causes unrelated homographs in the instance. | |
8785 | ||
8786 | if Nkind_In (N, N_Subprogram_Body, | |
8787 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 8788 | and then Present (Homonym (E)) |
c7b9d548 | 8789 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
8790 | then |
8791 | goto Next_Entity; | |
8792 | ||
c7b9d548 | 8793 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 | 8794 | goto Next_Entity; |
70f4ad20 AC |
8795 | |
8796 | elsif Different_Generic_Profile (E) then | |
8797 | goto Next_Entity; | |
996ae0b0 RK |
8798 | end if; |
8799 | end if; | |
8800 | ||
25ebc085 AC |
8801 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
8802 | -- null procedures locate the internally generated spec. We | |
8803 | -- enforce mode conformance since a tagged type may inherit | |
8804 | -- from interfaces several null primitives which differ only | |
8805 | -- in the mode of the formals. | |
8806 | ||
8807 | if not (Comes_From_Source (E)) | |
8808 | and then Is_Null_Procedure (E) | |
8809 | and then not Mode_Conformant (Designator, E) | |
8810 | then | |
8811 | null; | |
8812 | ||
4d8f3296 ES |
8813 | -- For null procedures coming from source that are completions, |
8814 | -- analysis of the generated body will establish the link. | |
8815 | ||
8816 | elsif Comes_From_Source (E) | |
8817 | and then Nkind (Spec) = N_Procedure_Specification | |
8818 | and then Null_Present (Spec) | |
8819 | then | |
8820 | return E; | |
8821 | ||
25ebc085 | 8822 | elsif not Has_Completion (E) then |
996ae0b0 RK |
8823 | if Nkind (N) /= N_Subprogram_Body_Stub then |
8824 | Set_Corresponding_Spec (N, E); | |
8825 | end if; | |
8826 | ||
8827 | Set_Has_Completion (E); | |
8828 | return E; | |
8829 | ||
8830 | elsif Nkind (Parent (N)) = N_Subunit then | |
8831 | ||
8832 | -- If this is the proper body of a subunit, the completion | |
8833 | -- flag is set when analyzing the stub. | |
8834 | ||
8835 | return E; | |
8836 | ||
70f4ad20 AC |
8837 | -- If E is an internal function with a controlling result that |
8838 | -- was created for an operation inherited by a null extension, | |
8839 | -- it may be overridden by a body without a previous spec (one | |
2995860f | 8840 | -- more reason why these should be shunned). In that case we |
70f4ad20 AC |
8841 | -- remove the generated body if present, because the current |
8842 | -- one is the explicit overriding. | |
81db9d77 ES |
8843 | |
8844 | elsif Ekind (E) = E_Function | |
0791fbe9 | 8845 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
8846 | and then not Comes_From_Source (E) |
8847 | and then Has_Controlling_Result (E) | |
8848 | and then Is_Null_Extension (Etype (E)) | |
8849 | and then Comes_From_Source (Spec) | |
8850 | then | |
8851 | Set_Has_Completion (E, False); | |
8852 | ||
1366997b AC |
8853 | if Expander_Active |
8854 | and then Nkind (Parent (E)) = N_Function_Specification | |
8855 | then | |
81db9d77 ES |
8856 | Remove |
8857 | (Unit_Declaration_Node | |
1366997b AC |
8858 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
8859 | ||
81db9d77 ES |
8860 | return E; |
8861 | ||
1366997b AC |
8862 | -- If expansion is disabled, or if the wrapper function has |
8863 | -- not been generated yet, this a late body overriding an | |
8864 | -- inherited operation, or it is an overriding by some other | |
8865 | -- declaration before the controlling result is frozen. In | |
8866 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
8867 | |
8868 | else | |
8869 | return Empty; | |
8870 | end if; | |
8871 | ||
d44202ba HK |
8872 | -- If the body already exists, then this is an error unless |
8873 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
8874 | -- derived subprogram. It is also legal for an instance to |
8875 | -- contain type conformant overloadable declarations (but the | |
8876 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
8877 | |
8878 | elsif No (Alias (E)) | |
8879 | and then not Is_Intrinsic_Subprogram (E) | |
8880 | and then not In_Instance | |
d44202ba | 8881 | and then Post_Error |
996ae0b0 RK |
8882 | then |
8883 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 8884 | |
07fc65c4 GB |
8885 | if Is_Imported (E) then |
8886 | Error_Msg_NE | |
8887 | ("body not allowed for imported subprogram & declared#", | |
8888 | N, E); | |
8889 | else | |
8890 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
8891 | end if; | |
996ae0b0 RK |
8892 | end if; |
8893 | ||
d44202ba HK |
8894 | -- Child units cannot be overloaded, so a conformance mismatch |
8895 | -- between body and a previous spec is an error. | |
8896 | ||
996ae0b0 RK |
8897 | elsif Is_Child_Unit (E) |
8898 | and then | |
8899 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
8900 | and then | |
5d37ba92 | 8901 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
8902 | N_Compilation_Unit |
8903 | and then Post_Error | |
996ae0b0 | 8904 | then |
996ae0b0 RK |
8905 | Error_Msg_N |
8906 | ("body of child unit does not match previous declaration", N); | |
8907 | end if; | |
8908 | end if; | |
8909 | ||
8910 | <<Next_Entity>> | |
8911 | E := Homonym (E); | |
8912 | end loop; | |
8913 | ||
8914 | -- On exit, we know that no previous declaration of subprogram exists | |
8915 | ||
8916 | return Empty; | |
8917 | end Find_Corresponding_Spec; | |
8918 | ||
8919 | ---------------------- | |
8920 | -- Fully_Conformant -- | |
8921 | ---------------------- | |
8922 | ||
8923 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
8924 | Result : Boolean; | |
996ae0b0 RK |
8925 | begin |
8926 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
8927 | return Result; | |
8928 | end Fully_Conformant; | |
8929 | ||
8930 | ---------------------------------- | |
8931 | -- Fully_Conformant_Expressions -- | |
8932 | ---------------------------------- | |
8933 | ||
8934 | function Fully_Conformant_Expressions | |
8935 | (Given_E1 : Node_Id; | |
d05ef0ab | 8936 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
8937 | is |
8938 | E1 : constant Node_Id := Original_Node (Given_E1); | |
8939 | E2 : constant Node_Id := Original_Node (Given_E2); | |
8940 | -- We always test conformance on original nodes, since it is possible | |
8941 | -- for analysis and/or expansion to make things look as though they | |
8942 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
8943 | ||
8944 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
8945 | renames Fully_Conformant_Expressions; | |
8946 | ||
8947 | function FCL (L1, L2 : List_Id) return Boolean; | |
70f4ad20 AC |
8948 | -- Compare elements of two lists for conformance. Elements have to be |
8949 | -- conformant, and actuals inserted as default parameters do not match | |
8950 | -- explicit actuals with the same value. | |
996ae0b0 RK |
8951 | |
8952 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 8953 | -- Compare an operator node with a function call |
996ae0b0 RK |
8954 | |
8955 | --------- | |
8956 | -- FCL -- | |
8957 | --------- | |
8958 | ||
8959 | function FCL (L1, L2 : List_Id) return Boolean is | |
8960 | N1, N2 : Node_Id; | |
8961 | ||
8962 | begin | |
8963 | if L1 = No_List then | |
8964 | N1 := Empty; | |
8965 | else | |
8966 | N1 := First (L1); | |
8967 | end if; | |
8968 | ||
8969 | if L2 = No_List then | |
8970 | N2 := Empty; | |
8971 | else | |
8972 | N2 := First (L2); | |
8973 | end if; | |
8974 | ||
70f4ad20 | 8975 | -- Compare two lists, skipping rewrite insertions (we want to compare |
a90bd866 | 8976 | -- the original trees, not the expanded versions). |
996ae0b0 RK |
8977 | |
8978 | loop | |
8979 | if Is_Rewrite_Insertion (N1) then | |
8980 | Next (N1); | |
8981 | elsif Is_Rewrite_Insertion (N2) then | |
8982 | Next (N2); | |
8983 | elsif No (N1) then | |
8984 | return No (N2); | |
8985 | elsif No (N2) then | |
8986 | return False; | |
8987 | elsif not FCE (N1, N2) then | |
8988 | return False; | |
8989 | else | |
8990 | Next (N1); | |
8991 | Next (N2); | |
8992 | end if; | |
8993 | end loop; | |
8994 | end FCL; | |
8995 | ||
8996 | --------- | |
8997 | -- FCO -- | |
8998 | --------- | |
8999 | ||
9000 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
9001 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
9002 | Act : Node_Id; | |
9003 | ||
9004 | begin | |
9005 | if No (Actuals) | |
9006 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
9007 | then | |
9008 | return False; | |
9009 | ||
9010 | else | |
9011 | Act := First (Actuals); | |
9012 | ||
9013 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
9014 | if not FCE (Left_Opnd (Op_Node), Act) then |
9015 | return False; | |
9016 | end if; | |
9017 | ||
9018 | Next (Act); | |
9019 | end if; | |
9020 | ||
9021 | return Present (Act) | |
9022 | and then FCE (Right_Opnd (Op_Node), Act) | |
9023 | and then No (Next (Act)); | |
9024 | end if; | |
9025 | end FCO; | |
9026 | ||
9027 | -- Start of processing for Fully_Conformant_Expressions | |
9028 | ||
9029 | begin | |
9030 | -- Non-conformant if paren count does not match. Note: if some idiot | |
9031 | -- complains that we don't do this right for more than 3 levels of | |
a90bd866 | 9032 | -- parentheses, they will be treated with the respect they deserve. |
996ae0b0 RK |
9033 | |
9034 | if Paren_Count (E1) /= Paren_Count (E2) then | |
9035 | return False; | |
9036 | ||
82c80734 RD |
9037 | -- If same entities are referenced, then they are conformant even if |
9038 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
9039 | |
9040 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
9041 | if Present (Entity (E1)) then | |
9042 | return Entity (E1) = Entity (E2) | |
9043 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
9044 | and then Ekind (Entity (E1)) = E_Discriminant | |
9045 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
9046 | ||
9047 | elsif Nkind (E1) = N_Expanded_Name | |
9048 | and then Nkind (E2) = N_Expanded_Name | |
9049 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
9050 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
9051 | then | |
9052 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
9053 | ||
9054 | else | |
9055 | -- Identifiers in component associations don't always have | |
9056 | -- entities, but their names must conform. | |
9057 | ||
9058 | return Nkind (E1) = N_Identifier | |
9059 | and then Nkind (E2) = N_Identifier | |
9060 | and then Chars (E1) = Chars (E2); | |
9061 | end if; | |
9062 | ||
9063 | elsif Nkind (E1) = N_Character_Literal | |
9064 | and then Nkind (E2) = N_Expanded_Name | |
9065 | then | |
9066 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
9067 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
9068 | ||
9069 | elsif Nkind (E2) = N_Character_Literal | |
9070 | and then Nkind (E1) = N_Expanded_Name | |
9071 | then | |
9072 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
9073 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
9074 | ||
8fde064e | 9075 | elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
996ae0b0 RK |
9076 | return FCO (E1, E2); |
9077 | ||
8fde064e | 9078 | elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
996ae0b0 RK |
9079 | return FCO (E2, E1); |
9080 | ||
9081 | -- Otherwise we must have the same syntactic entity | |
9082 | ||
9083 | elsif Nkind (E1) /= Nkind (E2) then | |
9084 | return False; | |
9085 | ||
9086 | -- At this point, we specialize by node type | |
9087 | ||
9088 | else | |
9089 | case Nkind (E1) is | |
9090 | ||
9091 | when N_Aggregate => | |
9092 | return | |
9093 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
9094 | and then |
9095 | FCL (Component_Associations (E1), | |
9096 | Component_Associations (E2)); | |
996ae0b0 RK |
9097 | |
9098 | when N_Allocator => | |
9099 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
9100 | or else | |
9101 | Nkind (Expression (E2)) = N_Qualified_Expression | |
9102 | then | |
9103 | return FCE (Expression (E1), Expression (E2)); | |
9104 | ||
9105 | -- Check that the subtype marks and any constraints | |
9106 | -- are conformant | |
9107 | ||
9108 | else | |
9109 | declare | |
9110 | Indic1 : constant Node_Id := Expression (E1); | |
9111 | Indic2 : constant Node_Id := Expression (E2); | |
9112 | Elt1 : Node_Id; | |
9113 | Elt2 : Node_Id; | |
9114 | ||
9115 | begin | |
9116 | if Nkind (Indic1) /= N_Subtype_Indication then | |
9117 | return | |
9118 | Nkind (Indic2) /= N_Subtype_Indication | |
9119 | and then Entity (Indic1) = Entity (Indic2); | |
9120 | ||
9121 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
9122 | return | |
9123 | Nkind (Indic1) /= N_Subtype_Indication | |
9124 | and then Entity (Indic1) = Entity (Indic2); | |
9125 | ||
9126 | else | |
9127 | if Entity (Subtype_Mark (Indic1)) /= | |
9128 | Entity (Subtype_Mark (Indic2)) | |
9129 | then | |
9130 | return False; | |
9131 | end if; | |
9132 | ||
9133 | Elt1 := First (Constraints (Constraint (Indic1))); | |
9134 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
9135 | while Present (Elt1) and then Present (Elt2) loop |
9136 | if not FCE (Elt1, Elt2) then | |
9137 | return False; | |
9138 | end if; | |
9139 | ||
9140 | Next (Elt1); | |
9141 | Next (Elt2); | |
9142 | end loop; | |
9143 | ||
9144 | return True; | |
9145 | end if; | |
9146 | end; | |
9147 | end if; | |
9148 | ||
9149 | when N_Attribute_Reference => | |
9150 | return | |
9151 | Attribute_Name (E1) = Attribute_Name (E2) | |
9152 | and then FCL (Expressions (E1), Expressions (E2)); | |
9153 | ||
9154 | when N_Binary_Op => | |
9155 | return | |
9156 | Entity (E1) = Entity (E2) | |
9157 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
9158 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
9159 | ||
514d0fc5 | 9160 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
9161 | return |
9162 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
9163 | and then | |
9164 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
9165 | ||
19d846a0 RD |
9166 | when N_Case_Expression => |
9167 | declare | |
9168 | Alt1 : Node_Id; | |
9169 | Alt2 : Node_Id; | |
9170 | ||
9171 | begin | |
9172 | if not FCE (Expression (E1), Expression (E2)) then | |
9173 | return False; | |
9174 | ||
9175 | else | |
9176 | Alt1 := First (Alternatives (E1)); | |
9177 | Alt2 := First (Alternatives (E2)); | |
9178 | loop | |
9179 | if Present (Alt1) /= Present (Alt2) then | |
9180 | return False; | |
9181 | elsif No (Alt1) then | |
9182 | return True; | |
9183 | end if; | |
9184 | ||
9185 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
9186 | or else not FCL (Discrete_Choices (Alt1), | |
9187 | Discrete_Choices (Alt2)) | |
9188 | then | |
9189 | return False; | |
9190 | end if; | |
9191 | ||
9192 | Next (Alt1); | |
9193 | Next (Alt2); | |
9194 | end loop; | |
9195 | end if; | |
9196 | end; | |
9197 | ||
996ae0b0 RK |
9198 | when N_Character_Literal => |
9199 | return | |
9200 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
9201 | ||
9202 | when N_Component_Association => | |
9203 | return | |
9204 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
9205 | and then |
9206 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 9207 | |
996ae0b0 RK |
9208 | when N_Explicit_Dereference => |
9209 | return | |
9210 | FCE (Prefix (E1), Prefix (E2)); | |
9211 | ||
9212 | when N_Extension_Aggregate => | |
9213 | return | |
9214 | FCL (Expressions (E1), Expressions (E2)) | |
9215 | and then Null_Record_Present (E1) = | |
9216 | Null_Record_Present (E2) | |
9217 | and then FCL (Component_Associations (E1), | |
9218 | Component_Associations (E2)); | |
9219 | ||
9220 | when N_Function_Call => | |
9221 | return | |
9222 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
9223 | and then |
9224 | FCL (Parameter_Associations (E1), | |
9225 | Parameter_Associations (E2)); | |
996ae0b0 | 9226 | |
9b16cb57 RD |
9227 | when N_If_Expression => |
9228 | return | |
9229 | FCL (Expressions (E1), Expressions (E2)); | |
9230 | ||
996ae0b0 RK |
9231 | when N_Indexed_Component => |
9232 | return | |
9233 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9234 | and then |
9235 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
9236 | |
9237 | when N_Integer_Literal => | |
9238 | return (Intval (E1) = Intval (E2)); | |
9239 | ||
9240 | when N_Null => | |
9241 | return True; | |
9242 | ||
9243 | when N_Operator_Symbol => | |
9244 | return | |
9245 | Chars (E1) = Chars (E2); | |
9246 | ||
9247 | when N_Others_Choice => | |
9248 | return True; | |
9249 | ||
9250 | when N_Parameter_Association => | |
9251 | return | |
996ae0b0 RK |
9252 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
9253 | and then FCE (Explicit_Actual_Parameter (E1), | |
9254 | Explicit_Actual_Parameter (E2)); | |
9255 | ||
9256 | when N_Qualified_Expression => | |
9257 | return | |
9258 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
9259 | and then |
9260 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 9261 | |
2010d078 AC |
9262 | when N_Quantified_Expression => |
9263 | if not FCE (Condition (E1), Condition (E2)) then | |
9264 | return False; | |
9265 | end if; | |
9266 | ||
9267 | if Present (Loop_Parameter_Specification (E1)) | |
9268 | and then Present (Loop_Parameter_Specification (E2)) | |
9269 | then | |
9270 | declare | |
9271 | L1 : constant Node_Id := | |
9272 | Loop_Parameter_Specification (E1); | |
9273 | L2 : constant Node_Id := | |
9274 | Loop_Parameter_Specification (E2); | |
9275 | ||
9276 | begin | |
9277 | return | |
9278 | Reverse_Present (L1) = Reverse_Present (L2) | |
9279 | and then | |
9280 | FCE (Defining_Identifier (L1), | |
9281 | Defining_Identifier (L2)) | |
9282 | and then | |
9283 | FCE (Discrete_Subtype_Definition (L1), | |
9284 | Discrete_Subtype_Definition (L2)); | |
9285 | end; | |
9286 | ||
804670f1 AC |
9287 | elsif Present (Iterator_Specification (E1)) |
9288 | and then Present (Iterator_Specification (E2)) | |
9289 | then | |
2010d078 AC |
9290 | declare |
9291 | I1 : constant Node_Id := Iterator_Specification (E1); | |
9292 | I2 : constant Node_Id := Iterator_Specification (E2); | |
9293 | ||
9294 | begin | |
9295 | return | |
9296 | FCE (Defining_Identifier (I1), | |
9297 | Defining_Identifier (I2)) | |
9298 | and then | |
9299 | Of_Present (I1) = Of_Present (I2) | |
9300 | and then | |
9301 | Reverse_Present (I1) = Reverse_Present (I2) | |
9302 | and then FCE (Name (I1), Name (I2)) | |
9303 | and then FCE (Subtype_Indication (I1), | |
9304 | Subtype_Indication (I2)); | |
9305 | end; | |
804670f1 AC |
9306 | |
9307 | -- The quantified expressions used different specifications to | |
9308 | -- walk their respective ranges. | |
9309 | ||
9310 | else | |
9311 | return False; | |
2010d078 AC |
9312 | end if; |
9313 | ||
996ae0b0 RK |
9314 | when N_Range => |
9315 | return | |
9316 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
9317 | and then |
9318 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
9319 | |
9320 | when N_Real_Literal => | |
9321 | return (Realval (E1) = Realval (E2)); | |
9322 | ||
9323 | when N_Selected_Component => | |
9324 | return | |
9325 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9326 | and then |
9327 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
9328 | |
9329 | when N_Slice => | |
9330 | return | |
9331 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
9332 | and then |
9333 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
9334 | |
9335 | when N_String_Literal => | |
9336 | declare | |
9337 | S1 : constant String_Id := Strval (E1); | |
9338 | S2 : constant String_Id := Strval (E2); | |
9339 | L1 : constant Nat := String_Length (S1); | |
9340 | L2 : constant Nat := String_Length (S2); | |
9341 | ||
9342 | begin | |
9343 | if L1 /= L2 then | |
9344 | return False; | |
9345 | ||
9346 | else | |
9347 | for J in 1 .. L1 loop | |
9348 | if Get_String_Char (S1, J) /= | |
9349 | Get_String_Char (S2, J) | |
9350 | then | |
9351 | return False; | |
9352 | end if; | |
9353 | end loop; | |
9354 | ||
9355 | return True; | |
9356 | end if; | |
9357 | end; | |
9358 | ||
9359 | when N_Type_Conversion => | |
9360 | return | |
9361 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
9362 | and then |
9363 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
9364 | |
9365 | when N_Unary_Op => | |
9366 | return | |
9367 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
9368 | and then |
9369 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
9370 | |
9371 | when N_Unchecked_Type_Conversion => | |
9372 | return | |
9373 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
9374 | and then |
9375 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
9376 | |
9377 | -- All other node types cannot appear in this context. Strictly | |
9378 | -- we should raise a fatal internal error. Instead we just ignore | |
9379 | -- the nodes. This means that if anyone makes a mistake in the | |
2995860f AC |
9380 | -- expander and mucks an expression tree irretrievably, the result |
9381 | -- will be a failure to detect a (probably very obscure) case | |
9382 | -- of non-conformance, which is better than bombing on some | |
996ae0b0 RK |
9383 | -- case where two expressions do in fact conform. |
9384 | ||
9385 | when others => | |
9386 | return True; | |
9387 | ||
9388 | end case; | |
9389 | end if; | |
9390 | end Fully_Conformant_Expressions; | |
9391 | ||
fbf5a39b AC |
9392 | ---------------------------------------- |
9393 | -- Fully_Conformant_Discrete_Subtypes -- | |
9394 | ---------------------------------------- | |
9395 | ||
9396 | function Fully_Conformant_Discrete_Subtypes | |
9397 | (Given_S1 : Node_Id; | |
d05ef0ab | 9398 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
9399 | is |
9400 | S1 : constant Node_Id := Original_Node (Given_S1); | |
9401 | S2 : constant Node_Id := Original_Node (Given_S2); | |
9402 | ||
9403 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
9404 | -- Special-case for a bound given by a discriminant, which in the body |
9405 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
9406 | |
9407 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 9408 | -- Check both bounds |
fbf5a39b | 9409 | |
5d37ba92 ES |
9410 | ----------------------- |
9411 | -- Conforming_Bounds -- | |
9412 | ----------------------- | |
9413 | ||
fbf5a39b AC |
9414 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
9415 | begin | |
9416 | if Is_Entity_Name (B1) | |
9417 | and then Is_Entity_Name (B2) | |
9418 | and then Ekind (Entity (B1)) = E_Discriminant | |
9419 | then | |
9420 | return Chars (B1) = Chars (B2); | |
9421 | ||
9422 | else | |
9423 | return Fully_Conformant_Expressions (B1, B2); | |
9424 | end if; | |
9425 | end Conforming_Bounds; | |
9426 | ||
5d37ba92 ES |
9427 | ----------------------- |
9428 | -- Conforming_Ranges -- | |
9429 | ----------------------- | |
9430 | ||
fbf5a39b AC |
9431 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
9432 | begin | |
9433 | return | |
9434 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
9435 | and then | |
9436 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
9437 | end Conforming_Ranges; | |
9438 | ||
9439 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
9440 | ||
9441 | begin | |
9442 | if Nkind (S1) /= Nkind (S2) then | |
9443 | return False; | |
9444 | ||
9445 | elsif Is_Entity_Name (S1) then | |
9446 | return Entity (S1) = Entity (S2); | |
9447 | ||
9448 | elsif Nkind (S1) = N_Range then | |
9449 | return Conforming_Ranges (S1, S2); | |
9450 | ||
9451 | elsif Nkind (S1) = N_Subtype_Indication then | |
9452 | return | |
9453 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
9454 | and then | |
9455 | Conforming_Ranges | |
9456 | (Range_Expression (Constraint (S1)), | |
9457 | Range_Expression (Constraint (S2))); | |
9458 | else | |
9459 | return True; | |
9460 | end if; | |
9461 | end Fully_Conformant_Discrete_Subtypes; | |
9462 | ||
996ae0b0 RK |
9463 | -------------------- |
9464 | -- Install_Entity -- | |
9465 | -------------------- | |
9466 | ||
9467 | procedure Install_Entity (E : Entity_Id) is | |
9468 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
9469 | begin |
9470 | Set_Is_Immediately_Visible (E); | |
9471 | Set_Current_Entity (E); | |
9472 | Set_Homonym (E, Prev); | |
9473 | end Install_Entity; | |
9474 | ||
9475 | --------------------- | |
9476 | -- Install_Formals -- | |
9477 | --------------------- | |
9478 | ||
9479 | procedure Install_Formals (Id : Entity_Id) is | |
9480 | F : Entity_Id; | |
996ae0b0 RK |
9481 | begin |
9482 | F := First_Formal (Id); | |
996ae0b0 RK |
9483 | while Present (F) loop |
9484 | Install_Entity (F); | |
9485 | Next_Formal (F); | |
9486 | end loop; | |
9487 | end Install_Formals; | |
9488 | ||
ce2b6ba5 JM |
9489 | ----------------------------- |
9490 | -- Is_Interface_Conformant -- | |
9491 | ----------------------------- | |
9492 | ||
9493 | function Is_Interface_Conformant | |
9494 | (Tagged_Type : Entity_Id; | |
9495 | Iface_Prim : Entity_Id; | |
9496 | Prim : Entity_Id) return Boolean | |
9497 | is | |
9e92ad49 AC |
9498 | -- The operation may in fact be an inherited (implicit) operation |
9499 | -- rather than the original interface primitive, so retrieve the | |
9500 | -- ultimate ancestor. | |
9501 | ||
9502 | Iface : constant Entity_Id := | |
9503 | Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); | |
fceeaab6 ES |
9504 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
9505 | ||
25ebc085 AC |
9506 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
9507 | -- Return the controlling formal of Prim | |
9508 | ||
59e6b23c AC |
9509 | ------------------------ |
9510 | -- Controlling_Formal -- | |
9511 | ------------------------ | |
9512 | ||
25ebc085 | 9513 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
15918371 | 9514 | E : Entity_Id; |
59e6b23c | 9515 | |
25ebc085 | 9516 | begin |
15918371 | 9517 | E := First_Entity (Prim); |
25ebc085 AC |
9518 | while Present (E) loop |
9519 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
9520 | return E; | |
9521 | end if; | |
9522 | ||
9523 | Next_Entity (E); | |
9524 | end loop; | |
9525 | ||
9526 | return Empty; | |
9527 | end Controlling_Formal; | |
9528 | ||
9529 | -- Local variables | |
9530 | ||
9531 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
9532 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
9533 | ||
9534 | -- Start of processing for Is_Interface_Conformant | |
9535 | ||
ce2b6ba5 JM |
9536 | begin |
9537 | pragma Assert (Is_Subprogram (Iface_Prim) | |
9538 | and then Is_Subprogram (Prim) | |
9539 | and then Is_Dispatching_Operation (Iface_Prim) | |
9540 | and then Is_Dispatching_Operation (Prim)); | |
9541 | ||
fceeaab6 | 9542 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
9543 | or else (Present (Alias (Iface_Prim)) |
9544 | and then | |
9545 | Is_Interface | |
9546 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
9547 | ||
9548 | if Prim = Iface_Prim | |
9549 | or else not Is_Subprogram (Prim) | |
9550 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
9551 | or else not Is_Dispatching_Operation (Prim) | |
9552 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 | 9553 | or else No (Typ) |
8a49a499 | 9554 | or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
ce2b6ba5 JM |
9555 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
9556 | then | |
9557 | return False; | |
9558 | ||
25ebc085 AC |
9559 | -- The mode of the controlling formals must match |
9560 | ||
9561 | elsif Present (Iface_Ctrl_F) | |
15918371 AC |
9562 | and then Present (Prim_Ctrl_F) |
9563 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
25ebc085 AC |
9564 | then |
9565 | return False; | |
9566 | ||
9567 | -- Case of a procedure, or a function whose result type matches the | |
9568 | -- result type of the interface primitive, or a function that has no | |
9569 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
9570 | |
9571 | elsif Ekind (Iface_Prim) = E_Procedure | |
9572 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 9573 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 9574 | then |
b4d7b435 AC |
9575 | return Type_Conformant |
9576 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 9577 | |
2995860f AC |
9578 | -- Case of a function returning an interface, or an access to one. Check |
9579 | -- that the return types correspond. | |
ce2b6ba5 | 9580 | |
fceeaab6 ES |
9581 | elsif Implements_Interface (Typ, Iface) then |
9582 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
9583 | /= |
9584 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
9585 | then |
9586 | return False; | |
fceeaab6 ES |
9587 | else |
9588 | return | |
9e92ad49 | 9589 | Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
ce2b6ba5 | 9590 | Skip_Controlling_Formals => True); |
fceeaab6 | 9591 | end if; |
ce2b6ba5 | 9592 | |
fceeaab6 ES |
9593 | else |
9594 | return False; | |
ce2b6ba5 | 9595 | end if; |
ce2b6ba5 JM |
9596 | end Is_Interface_Conformant; |
9597 | ||
996ae0b0 RK |
9598 | --------------------------------- |
9599 | -- Is_Non_Overriding_Operation -- | |
9600 | --------------------------------- | |
9601 | ||
9602 | function Is_Non_Overriding_Operation | |
9603 | (Prev_E : Entity_Id; | |
d05ef0ab | 9604 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
9605 | is |
9606 | Formal : Entity_Id; | |
9607 | F_Typ : Entity_Id; | |
9608 | G_Typ : Entity_Id := Empty; | |
9609 | ||
9610 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
9611 | -- If F_Type is a derived type associated with a generic actual subtype, |
9612 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
9613 | |
9614 | function Types_Correspond | |
9615 | (P_Type : Entity_Id; | |
d05ef0ab | 9616 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
9617 | -- Returns true if and only if the types (or designated types in the |
9618 | -- case of anonymous access types) are the same or N_Type is derived | |
9619 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
9620 | |
9621 | ----------------------------- | |
9622 | -- Get_Generic_Parent_Type -- | |
9623 | ----------------------------- | |
9624 | ||
9625 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
9626 | G_Typ : Entity_Id; | |
702d2020 | 9627 | Defn : Node_Id; |
996ae0b0 RK |
9628 | Indic : Node_Id; |
9629 | ||
9630 | begin | |
9631 | if Is_Derived_Type (F_Typ) | |
9632 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
9633 | then | |
82c80734 RD |
9634 | -- The tree must be traversed to determine the parent subtype in |
9635 | -- the generic unit, which unfortunately isn't always available | |
9636 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
9637 | -- is needed for cases where a full derived type has been | |
9638 | -- rewritten.) | |
996ae0b0 | 9639 | |
702d2020 AC |
9640 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); |
9641 | if Nkind (Defn) = N_Derived_Type_Definition then | |
9642 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 9643 | |
702d2020 AC |
9644 | if Nkind (Indic) = N_Subtype_Indication then |
9645 | G_Typ := Entity (Subtype_Mark (Indic)); | |
9646 | else | |
9647 | G_Typ := Entity (Indic); | |
9648 | end if; | |
996ae0b0 | 9649 | |
702d2020 AC |
9650 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
9651 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
9652 | then | |
9653 | return Generic_Parent_Type (Parent (G_Typ)); | |
9654 | end if; | |
996ae0b0 RK |
9655 | end if; |
9656 | end if; | |
9657 | ||
9658 | return Empty; | |
9659 | end Get_Generic_Parent_Type; | |
9660 | ||
9661 | ---------------------- | |
9662 | -- Types_Correspond -- | |
9663 | ---------------------- | |
9664 | ||
9665 | function Types_Correspond | |
9666 | (P_Type : Entity_Id; | |
d05ef0ab | 9667 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
9668 | is |
9669 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
9670 | New_Type : Entity_Id := Base_Type (N_Type); | |
9671 | ||
9672 | begin | |
9673 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
9674 | Prev_Type := Designated_Type (Prev_Type); | |
9675 | end if; | |
9676 | ||
9677 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
9678 | New_Type := Designated_Type (New_Type); | |
9679 | end if; | |
9680 | ||
9681 | if Prev_Type = New_Type then | |
9682 | return True; | |
9683 | ||
9684 | elsif not Is_Class_Wide_Type (New_Type) then | |
9685 | while Etype (New_Type) /= New_Type loop | |
9686 | New_Type := Etype (New_Type); | |
9687 | if New_Type = Prev_Type then | |
9688 | return True; | |
9689 | end if; | |
9690 | end loop; | |
9691 | end if; | |
9692 | return False; | |
9693 | end Types_Correspond; | |
9694 | ||
9695 | -- Start of processing for Is_Non_Overriding_Operation | |
9696 | ||
9697 | begin | |
82c80734 RD |
9698 | -- In the case where both operations are implicit derived subprograms |
9699 | -- then neither overrides the other. This can only occur in certain | |
9700 | -- obscure cases (e.g., derivation from homographs created in a generic | |
9701 | -- instantiation). | |
996ae0b0 RK |
9702 | |
9703 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
9704 | return True; | |
9705 | ||
9706 | elsif Ekind (Current_Scope) = E_Package | |
9707 | and then Is_Generic_Instance (Current_Scope) | |
9708 | and then In_Private_Part (Current_Scope) | |
9709 | and then Comes_From_Source (New_E) | |
9710 | then | |
702d2020 AC |
9711 | -- We examine the formals and result type of the inherited operation, |
9712 | -- to determine whether their type is derived from (the instance of) | |
9713 | -- a generic type. The first such formal or result type is the one | |
9714 | -- tested. | |
996ae0b0 RK |
9715 | |
9716 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
9717 | while Present (Formal) loop |
9718 | F_Typ := Base_Type (Etype (Formal)); | |
9719 | ||
9720 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
9721 | F_Typ := Designated_Type (F_Typ); | |
9722 | end if; | |
9723 | ||
9724 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 9725 | exit when Present (G_Typ); |
996ae0b0 RK |
9726 | |
9727 | Next_Formal (Formal); | |
9728 | end loop; | |
9729 | ||
c8ef728f | 9730 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
9731 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
9732 | end if; | |
9733 | ||
9734 | if No (G_Typ) then | |
9735 | return False; | |
9736 | end if; | |
9737 | ||
8dbd1460 AC |
9738 | -- If the generic type is a private type, then the original operation |
9739 | -- was not overriding in the generic, because there was no primitive | |
9740 | -- operation to override. | |
996ae0b0 RK |
9741 | |
9742 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
9743 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 9744 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
9745 | then |
9746 | return True; | |
9747 | ||
9748 | -- The generic parent type is the ancestor of a formal derived | |
9749 | -- type declaration. We need to check whether it has a primitive | |
9750 | -- operation that should be overridden by New_E in the generic. | |
9751 | ||
9752 | else | |
9753 | declare | |
9754 | P_Formal : Entity_Id; | |
9755 | N_Formal : Entity_Id; | |
9756 | P_Typ : Entity_Id; | |
9757 | N_Typ : Entity_Id; | |
9758 | P_Prim : Entity_Id; | |
9759 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
9760 | ||
9761 | begin | |
9762 | while Present (Prim_Elt) loop | |
9763 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 9764 | |
996ae0b0 RK |
9765 | if Chars (P_Prim) = Chars (New_E) |
9766 | and then Ekind (P_Prim) = Ekind (New_E) | |
9767 | then | |
9768 | P_Formal := First_Formal (P_Prim); | |
9769 | N_Formal := First_Formal (New_E); | |
9770 | while Present (P_Formal) and then Present (N_Formal) loop | |
9771 | P_Typ := Etype (P_Formal); | |
9772 | N_Typ := Etype (N_Formal); | |
9773 | ||
9774 | if not Types_Correspond (P_Typ, N_Typ) then | |
9775 | exit; | |
9776 | end if; | |
9777 | ||
9778 | Next_Entity (P_Formal); | |
9779 | Next_Entity (N_Formal); | |
9780 | end loop; | |
9781 | ||
82c80734 RD |
9782 | -- Found a matching primitive operation belonging to the |
9783 | -- formal ancestor type, so the new subprogram is | |
9784 | -- overriding. | |
996ae0b0 | 9785 | |
c8ef728f ES |
9786 | if No (P_Formal) |
9787 | and then No (N_Formal) | |
996ae0b0 RK |
9788 | and then (Ekind (New_E) /= E_Function |
9789 | or else | |
8fde064e AC |
9790 | Types_Correspond |
9791 | (Etype (P_Prim), Etype (New_E))) | |
996ae0b0 RK |
9792 | then |
9793 | return False; | |
9794 | end if; | |
9795 | end if; | |
9796 | ||
9797 | Next_Elmt (Prim_Elt); | |
9798 | end loop; | |
9799 | ||
2995860f AC |
9800 | -- If no match found, then the new subprogram does not override |
9801 | -- in the generic (nor in the instance). | |
996ae0b0 | 9802 | |
260359e3 AC |
9803 | -- If the type in question is not abstract, and the subprogram |
9804 | -- is, this will be an error if the new operation is in the | |
9805 | -- private part of the instance. Emit a warning now, which will | |
9806 | -- make the subsequent error message easier to understand. | |
9807 | ||
9808 | if not Is_Abstract_Type (F_Typ) | |
9809 | and then Is_Abstract_Subprogram (Prev_E) | |
9810 | and then In_Private_Part (Current_Scope) | |
9811 | then | |
9812 | Error_Msg_Node_2 := F_Typ; | |
9813 | Error_Msg_NE | |
9814 | ("private operation& in generic unit does not override " & | |
dbfeb4fa | 9815 | "any primitive operation of& (RM 12.3 (18))??", |
260359e3 AC |
9816 | New_E, New_E); |
9817 | end if; | |
9818 | ||
996ae0b0 RK |
9819 | return True; |
9820 | end; | |
9821 | end if; | |
9822 | else | |
9823 | return False; | |
9824 | end if; | |
9825 | end Is_Non_Overriding_Operation; | |
9826 | ||
beacce02 AC |
9827 | ------------------------------------- |
9828 | -- List_Inherited_Pre_Post_Aspects -- | |
9829 | ------------------------------------- | |
9830 | ||
9831 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
9832 | begin | |
e606088a | 9833 | if Opt.List_Inherited_Aspects |
beacce02 AC |
9834 | and then (Is_Subprogram (E) or else Is_Generic_Subprogram (E)) |
9835 | then | |
9836 | declare | |
dbfeb4fa | 9837 | Inherited : constant Subprogram_List := Inherited_Subprograms (E); |
beacce02 AC |
9838 | P : Node_Id; |
9839 | ||
9840 | begin | |
9841 | for J in Inherited'Range loop | |
d6095153 | 9842 | P := Pre_Post_Conditions (Contract (Inherited (J))); |
beacce02 AC |
9843 | while Present (P) loop |
9844 | Error_Msg_Sloc := Sloc (P); | |
9845 | ||
9846 | if Class_Present (P) and then not Split_PPC (P) then | |
9847 | if Pragma_Name (P) = Name_Precondition then | |
9848 | Error_Msg_N | |
685bc70f AC |
9849 | ("info: & inherits `Pre''Class` aspect from #?L?", |
9850 | E); | |
beacce02 AC |
9851 | else |
9852 | Error_Msg_N | |
685bc70f AC |
9853 | ("info: & inherits `Post''Class` aspect from #?L?", |
9854 | E); | |
beacce02 AC |
9855 | end if; |
9856 | end if; | |
9857 | ||
9858 | P := Next_Pragma (P); | |
9859 | end loop; | |
9860 | end loop; | |
9861 | end; | |
9862 | end if; | |
9863 | end List_Inherited_Pre_Post_Aspects; | |
9864 | ||
996ae0b0 RK |
9865 | ------------------------------ |
9866 | -- Make_Inequality_Operator -- | |
9867 | ------------------------------ | |
9868 | ||
9869 | -- S is the defining identifier of an equality operator. We build a | |
9870 | -- subprogram declaration with the right signature. This operation is | |
9871 | -- intrinsic, because it is always expanded as the negation of the | |
9872 | -- call to the equality function. | |
9873 | ||
9874 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
9875 | Loc : constant Source_Ptr := Sloc (S); | |
9876 | Decl : Node_Id; | |
9877 | Formals : List_Id; | |
9878 | Op_Name : Entity_Id; | |
9879 | ||
c8ef728f ES |
9880 | FF : constant Entity_Id := First_Formal (S); |
9881 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
9882 | |
9883 | begin | |
c8ef728f | 9884 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 9885 | |
c8ef728f | 9886 | if No (NF) then |
996ae0b0 RK |
9887 | return; |
9888 | end if; | |
9889 | ||
c8ef728f ES |
9890 | declare |
9891 | A : constant Entity_Id := | |
9892 | Make_Defining_Identifier (Sloc (FF), | |
9893 | Chars => Chars (FF)); | |
9894 | ||
5d37ba92 ES |
9895 | B : constant Entity_Id := |
9896 | Make_Defining_Identifier (Sloc (NF), | |
9897 | Chars => Chars (NF)); | |
c8ef728f ES |
9898 | |
9899 | begin | |
9900 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
9901 | ||
9902 | Formals := New_List ( | |
9903 | Make_Parameter_Specification (Loc, | |
9904 | Defining_Identifier => A, | |
9905 | Parameter_Type => | |
e4494292 | 9906 | New_Occurrence_Of (Etype (First_Formal (S)), |
c8ef728f ES |
9907 | Sloc (Etype (First_Formal (S))))), |
9908 | ||
9909 | Make_Parameter_Specification (Loc, | |
9910 | Defining_Identifier => B, | |
9911 | Parameter_Type => | |
e4494292 | 9912 | New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
c8ef728f ES |
9913 | Sloc (Etype (Next_Formal (First_Formal (S))))))); |
9914 | ||
9915 | Decl := | |
9916 | Make_Subprogram_Declaration (Loc, | |
9917 | Specification => | |
9918 | Make_Function_Specification (Loc, | |
9919 | Defining_Unit_Name => Op_Name, | |
9920 | Parameter_Specifications => Formals, | |
9921 | Result_Definition => | |
e4494292 | 9922 | New_Occurrence_Of (Standard_Boolean, Loc))); |
c8ef728f ES |
9923 | |
9924 | -- Insert inequality right after equality if it is explicit or after | |
9925 | -- the derived type when implicit. These entities are created only | |
2995860f AC |
9926 | -- for visibility purposes, and eventually replaced in the course |
9927 | -- of expansion, so they do not need to be attached to the tree and | |
9928 | -- seen by the back-end. Keeping them internal also avoids spurious | |
c8ef728f ES |
9929 | -- freezing problems. The declaration is inserted in the tree for |
9930 | -- analysis, and removed afterwards. If the equality operator comes | |
9931 | -- from an explicit declaration, attach the inequality immediately | |
9932 | -- after. Else the equality is inherited from a derived type | |
9933 | -- declaration, so insert inequality after that declaration. | |
9934 | ||
9935 | if No (Alias (S)) then | |
9936 | Insert_After (Unit_Declaration_Node (S), Decl); | |
9937 | elsif Is_List_Member (Parent (S)) then | |
9938 | Insert_After (Parent (S), Decl); | |
9939 | else | |
9940 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
9941 | end if; | |
996ae0b0 | 9942 | |
c8ef728f ES |
9943 | Mark_Rewrite_Insertion (Decl); |
9944 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
9945 | Analyze (Decl); | |
9946 | Remove (Decl); | |
9947 | Set_Has_Completion (Op_Name); | |
9948 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 9949 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 9950 | end; |
996ae0b0 RK |
9951 | end Make_Inequality_Operator; |
9952 | ||
9953 | ---------------------- | |
9954 | -- May_Need_Actuals -- | |
9955 | ---------------------- | |
9956 | ||
9957 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
9958 | F : Entity_Id; | |
9959 | B : Boolean; | |
9960 | ||
9961 | begin | |
9962 | F := First_Formal (Fun); | |
9963 | B := True; | |
996ae0b0 RK |
9964 | while Present (F) loop |
9965 | if No (Default_Value (F)) then | |
9966 | B := False; | |
9967 | exit; | |
9968 | end if; | |
9969 | ||
9970 | Next_Formal (F); | |
9971 | end loop; | |
9972 | ||
9973 | Set_Needs_No_Actuals (Fun, B); | |
9974 | end May_Need_Actuals; | |
9975 | ||
9976 | --------------------- | |
9977 | -- Mode_Conformant -- | |
9978 | --------------------- | |
9979 | ||
9980 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
9981 | Result : Boolean; | |
996ae0b0 RK |
9982 | begin |
9983 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
9984 | return Result; | |
9985 | end Mode_Conformant; | |
9986 | ||
9987 | --------------------------- | |
9988 | -- New_Overloaded_Entity -- | |
9989 | --------------------------- | |
9990 | ||
9991 | procedure New_Overloaded_Entity | |
9992 | (S : Entity_Id; | |
9993 | Derived_Type : Entity_Id := Empty) | |
9994 | is | |
ec4867fa | 9995 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
9996 | -- Set if the current scope has an operation that is type-conformant |
9997 | -- with S, and becomes hidden by S. | |
9998 | ||
5d37ba92 ES |
9999 | Is_Primitive_Subp : Boolean; |
10000 | -- Set to True if the new subprogram is primitive | |
10001 | ||
fbf5a39b AC |
10002 | E : Entity_Id; |
10003 | -- Entity that S overrides | |
10004 | ||
996ae0b0 | 10005 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
10006 | -- Predecessor of E in Homonym chain |
10007 | ||
5d37ba92 ES |
10008 | procedure Check_For_Primitive_Subprogram |
10009 | (Is_Primitive : out Boolean; | |
10010 | Is_Overriding : Boolean := False); | |
10011 | -- If the subprogram being analyzed is a primitive operation of the type | |
10012 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
10013 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
10014 | -- corresponding flag on the entity itself for later use. | |
10015 | ||
ec4867fa ES |
10016 | procedure Check_Synchronized_Overriding |
10017 | (Def_Id : Entity_Id; | |
ec4867fa ES |
10018 | Overridden_Subp : out Entity_Id); |
10019 | -- First determine if Def_Id is an entry or a subprogram either defined | |
10020 | -- in the scope of a task or protected type, or is a primitive of such | |
10021 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
10022 | -- implemented by the synchronized type, return the overridden entity | |
10023 | -- or Empty. | |
758c442c | 10024 | |
996ae0b0 RK |
10025 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
10026 | -- Check that E is declared in the private part of the current package, | |
10027 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 10028 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
10029 | -- set when freezing entities, so we must examine the place of the |
10030 | -- declaration in the tree, and recognize wrapper packages as well. | |
10031 | ||
2ddc2000 AC |
10032 | function Is_Overriding_Alias |
10033 | (Old_E : Entity_Id; | |
10034 | New_E : Entity_Id) return Boolean; | |
10035 | -- Check whether new subprogram and old subprogram are both inherited | |
10036 | -- from subprograms that have distinct dispatch table entries. This can | |
2995860f AC |
10037 | -- occur with derivations from instances with accidental homonyms. The |
10038 | -- function is conservative given that the converse is only true within | |
10039 | -- instances that contain accidental overloadings. | |
2ddc2000 | 10040 | |
5d37ba92 ES |
10041 | ------------------------------------ |
10042 | -- Check_For_Primitive_Subprogram -- | |
10043 | ------------------------------------ | |
996ae0b0 | 10044 | |
5d37ba92 ES |
10045 | procedure Check_For_Primitive_Subprogram |
10046 | (Is_Primitive : out Boolean; | |
10047 | Is_Overriding : Boolean := False) | |
ec4867fa | 10048 | is |
996ae0b0 RK |
10049 | Formal : Entity_Id; |
10050 | F_Typ : Entity_Id; | |
07fc65c4 | 10051 | B_Typ : Entity_Id; |
996ae0b0 RK |
10052 | |
10053 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
10054 | -- Returns true if T is declared in the visible part of the current |
10055 | -- package scope; otherwise returns false. Assumes that T is declared | |
10056 | -- in a package. | |
996ae0b0 RK |
10057 | |
10058 | procedure Check_Private_Overriding (T : Entity_Id); | |
10059 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
10060 | -- abstract type is declared in a private part, then it must override |
10061 | -- an abstract subprogram declared in the visible part. Also checks | |
10062 | -- that if a primitive function with a controlling result is declared | |
10063 | -- in a private part, then it must override a function declared in | |
10064 | -- the visible part. | |
996ae0b0 RK |
10065 | |
10066 | ------------------------------ | |
10067 | -- Check_Private_Overriding -- | |
10068 | ------------------------------ | |
10069 | ||
10070 | procedure Check_Private_Overriding (T : Entity_Id) is | |
10071 | begin | |
51c16e29 | 10072 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
10073 | and then In_Private_Part (Current_Scope) |
10074 | and then Visible_Part_Type (T) | |
10075 | and then not In_Instance | |
10076 | then | |
f937473f RD |
10077 | if Is_Abstract_Type (T) |
10078 | and then Is_Abstract_Subprogram (S) | |
10079 | and then (not Is_Overriding | |
8dbd1460 | 10080 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 10081 | then |
ed2233dc | 10082 | Error_Msg_N |
19d846a0 RD |
10083 | ("abstract subprograms must be visible " |
10084 | & "(RM 3.9.3(10))!", S); | |
758c442c | 10085 | |
8fde064e AC |
10086 | elsif Ekind (S) = E_Function and then not Is_Overriding then |
10087 | if Is_Tagged_Type (T) and then T = Base_Type (Etype (S)) then | |
2e79de51 AC |
10088 | Error_Msg_N |
10089 | ("private function with tagged result must" | |
10090 | & " override visible-part function", S); | |
10091 | Error_Msg_N | |
10092 | ("\move subprogram to the visible part" | |
10093 | & " (RM 3.9.3(10))", S); | |
10094 | ||
10095 | -- AI05-0073: extend this test to the case of a function | |
10096 | -- with a controlling access result. | |
10097 | ||
10098 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
10099 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
10100 | and then | |
10101 | not Is_Class_Wide_Type (Designated_Type (Etype (S))) | |
dbe945f1 | 10102 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
10103 | then |
10104 | Error_Msg_N | |
10105 | ("private function with controlling access result " | |
10106 | & "must override visible-part function", S); | |
10107 | Error_Msg_N | |
10108 | ("\move subprogram to the visible part" | |
10109 | & " (RM 3.9.3(10))", S); | |
10110 | end if; | |
996ae0b0 RK |
10111 | end if; |
10112 | end if; | |
10113 | end Check_Private_Overriding; | |
10114 | ||
10115 | ----------------------- | |
10116 | -- Visible_Part_Type -- | |
10117 | ----------------------- | |
10118 | ||
10119 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
10120 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
10121 | N : Node_Id; | |
996ae0b0 RK |
10122 | |
10123 | begin | |
8dbd1460 AC |
10124 | -- If the entity is a private type, then it must be declared in a |
10125 | -- visible part. | |
996ae0b0 RK |
10126 | |
10127 | if Ekind (T) in Private_Kind then | |
10128 | return True; | |
10129 | end if; | |
10130 | ||
10131 | -- Otherwise, we traverse the visible part looking for its | |
10132 | -- corresponding declaration. We cannot use the declaration | |
10133 | -- node directly because in the private part the entity of a | |
10134 | -- private type is the one in the full view, which does not | |
10135 | -- indicate that it is the completion of something visible. | |
10136 | ||
07fc65c4 | 10137 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
10138 | while Present (N) loop |
10139 | if Nkind (N) = N_Full_Type_Declaration | |
10140 | and then Present (Defining_Identifier (N)) | |
10141 | and then T = Defining_Identifier (N) | |
10142 | then | |
10143 | return True; | |
10144 | ||
800621e0 RD |
10145 | elsif Nkind_In (N, N_Private_Type_Declaration, |
10146 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
10147 | and then Present (Defining_Identifier (N)) |
10148 | and then T = Full_View (Defining_Identifier (N)) | |
10149 | then | |
10150 | return True; | |
10151 | end if; | |
10152 | ||
10153 | Next (N); | |
10154 | end loop; | |
10155 | ||
10156 | return False; | |
10157 | end Visible_Part_Type; | |
10158 | ||
5d37ba92 | 10159 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
10160 | |
10161 | begin | |
5d37ba92 ES |
10162 | Is_Primitive := False; |
10163 | ||
996ae0b0 RK |
10164 | if not Comes_From_Source (S) then |
10165 | null; | |
10166 | ||
5d37ba92 | 10167 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
10168 | |
10169 | elsif Current_Scope = Standard_Standard then | |
10170 | null; | |
10171 | ||
b9b2405f | 10172 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 10173 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 10174 | or else Is_Overriding |
996ae0b0 | 10175 | then |
07fc65c4 | 10176 | -- For function, check return type |
996ae0b0 | 10177 | |
07fc65c4 | 10178 | if Ekind (S) = E_Function then |
5d37ba92 ES |
10179 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
10180 | F_Typ := Designated_Type (Etype (S)); | |
10181 | else | |
10182 | F_Typ := Etype (S); | |
10183 | end if; | |
10184 | ||
10185 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 10186 | |
5d37ba92 ES |
10187 | if Scope (B_Typ) = Current_Scope |
10188 | and then not Is_Class_Wide_Type (B_Typ) | |
10189 | and then not Is_Generic_Type (B_Typ) | |
10190 | then | |
10191 | Is_Primitive := True; | |
07fc65c4 | 10192 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 10193 | Set_Is_Primitive (S); |
07fc65c4 GB |
10194 | Check_Private_Overriding (B_Typ); |
10195 | end if; | |
996ae0b0 RK |
10196 | end if; |
10197 | ||
07fc65c4 | 10198 | -- For all subprograms, check formals |
996ae0b0 | 10199 | |
07fc65c4 | 10200 | Formal := First_Formal (S); |
996ae0b0 RK |
10201 | while Present (Formal) loop |
10202 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
10203 | F_Typ := Designated_Type (Etype (Formal)); | |
10204 | else | |
10205 | F_Typ := Etype (Formal); | |
10206 | end if; | |
10207 | ||
07fc65c4 GB |
10208 | B_Typ := Base_Type (F_Typ); |
10209 | ||
ec4867fa ES |
10210 | if Ekind (B_Typ) = E_Access_Subtype then |
10211 | B_Typ := Base_Type (B_Typ); | |
10212 | end if; | |
10213 | ||
5d37ba92 ES |
10214 | if Scope (B_Typ) = Current_Scope |
10215 | and then not Is_Class_Wide_Type (B_Typ) | |
10216 | and then not Is_Generic_Type (B_Typ) | |
10217 | then | |
10218 | Is_Primitive := True; | |
10219 | Set_Is_Primitive (S); | |
07fc65c4 GB |
10220 | Set_Has_Primitive_Operations (B_Typ); |
10221 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
10222 | end if; |
10223 | ||
10224 | Next_Formal (Formal); | |
10225 | end loop; | |
1aee1fb3 AC |
10226 | |
10227 | -- Special case: An equality function can be redefined for a type | |
10228 | -- occurring in a declarative part, and won't otherwise be treated as | |
10229 | -- a primitive because it doesn't occur in a package spec and doesn't | |
10230 | -- override an inherited subprogram. It's important that we mark it | |
10231 | -- primitive so it can be returned by Collect_Primitive_Operations | |
10232 | -- and be used in composing the equality operation of later types | |
10233 | -- that have a component of the type. | |
10234 | ||
10235 | elsif Chars (S) = Name_Op_Eq | |
10236 | and then Etype (S) = Standard_Boolean | |
10237 | then | |
10238 | B_Typ := Base_Type (Etype (First_Formal (S))); | |
10239 | ||
10240 | if Scope (B_Typ) = Current_Scope | |
10241 | and then | |
10242 | Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ | |
10243 | and then not Is_Limited_Type (B_Typ) | |
10244 | then | |
10245 | Is_Primitive := True; | |
10246 | Set_Is_Primitive (S); | |
10247 | Set_Has_Primitive_Operations (B_Typ); | |
10248 | Check_Private_Overriding (B_Typ); | |
10249 | end if; | |
996ae0b0 | 10250 | end if; |
5d37ba92 ES |
10251 | end Check_For_Primitive_Subprogram; |
10252 | ||
10253 | ----------------------------------- | |
10254 | -- Check_Synchronized_Overriding -- | |
10255 | ----------------------------------- | |
10256 | ||
10257 | procedure Check_Synchronized_Overriding | |
10258 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
10259 | Overridden_Subp : out Entity_Id) |
10260 | is | |
5d37ba92 ES |
10261 | Ifaces_List : Elist_Id; |
10262 | In_Scope : Boolean; | |
10263 | Typ : Entity_Id; | |
10264 | ||
8aa15e3b JM |
10265 | function Matches_Prefixed_View_Profile |
10266 | (Prim_Params : List_Id; | |
10267 | Iface_Params : List_Id) return Boolean; | |
10268 | -- Determine whether a subprogram's parameter profile Prim_Params | |
10269 | -- matches that of a potentially overridden interface subprogram | |
10270 | -- Iface_Params. Also determine if the type of first parameter of | |
10271 | -- Iface_Params is an implemented interface. | |
10272 | ||
8aa15e3b JM |
10273 | ----------------------------------- |
10274 | -- Matches_Prefixed_View_Profile -- | |
10275 | ----------------------------------- | |
10276 | ||
10277 | function Matches_Prefixed_View_Profile | |
10278 | (Prim_Params : List_Id; | |
10279 | Iface_Params : List_Id) return Boolean | |
10280 | is | |
10281 | Iface_Id : Entity_Id; | |
10282 | Iface_Param : Node_Id; | |
10283 | Iface_Typ : Entity_Id; | |
10284 | Prim_Id : Entity_Id; | |
10285 | Prim_Param : Node_Id; | |
10286 | Prim_Typ : Entity_Id; | |
10287 | ||
10288 | function Is_Implemented | |
10289 | (Ifaces_List : Elist_Id; | |
10290 | Iface : Entity_Id) return Boolean; | |
10291 | -- Determine if Iface is implemented by the current task or | |
10292 | -- protected type. | |
10293 | ||
10294 | -------------------- | |
10295 | -- Is_Implemented -- | |
10296 | -------------------- | |
10297 | ||
10298 | function Is_Implemented | |
10299 | (Ifaces_List : Elist_Id; | |
10300 | Iface : Entity_Id) return Boolean | |
10301 | is | |
10302 | Iface_Elmt : Elmt_Id; | |
10303 | ||
10304 | begin | |
10305 | Iface_Elmt := First_Elmt (Ifaces_List); | |
10306 | while Present (Iface_Elmt) loop | |
10307 | if Node (Iface_Elmt) = Iface then | |
10308 | return True; | |
10309 | end if; | |
10310 | ||
10311 | Next_Elmt (Iface_Elmt); | |
10312 | end loop; | |
10313 | ||
10314 | return False; | |
10315 | end Is_Implemented; | |
10316 | ||
10317 | -- Start of processing for Matches_Prefixed_View_Profile | |
10318 | ||
10319 | begin | |
10320 | Iface_Param := First (Iface_Params); | |
10321 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
10322 | ||
10323 | if Is_Access_Type (Iface_Typ) then | |
10324 | Iface_Typ := Designated_Type (Iface_Typ); | |
10325 | end if; | |
10326 | ||
10327 | Prim_Param := First (Prim_Params); | |
10328 | ||
10329 | -- The first parameter of the potentially overridden subprogram | |
10330 | -- must be an interface implemented by Prim. | |
10331 | ||
10332 | if not Is_Interface (Iface_Typ) | |
10333 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
10334 | then | |
10335 | return False; | |
10336 | end if; | |
10337 | ||
10338 | -- The checks on the object parameters are done, move onto the | |
10339 | -- rest of the parameters. | |
10340 | ||
10341 | if not In_Scope then | |
10342 | Prim_Param := Next (Prim_Param); | |
10343 | end if; | |
10344 | ||
10345 | Iface_Param := Next (Iface_Param); | |
10346 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
10347 | Iface_Id := Defining_Identifier (Iface_Param); | |
10348 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
10349 | ||
8aa15e3b JM |
10350 | Prim_Id := Defining_Identifier (Prim_Param); |
10351 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
10352 | ||
15e4986c JM |
10353 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
10354 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
10355 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
10356 | then | |
10357 | Iface_Typ := Designated_Type (Iface_Typ); | |
10358 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
10359 | end if; |
10360 | ||
10361 | -- Case of multiple interface types inside a parameter profile | |
10362 | ||
10363 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
10364 | ||
10365 | -- If the interface type is implemented, then the matching type | |
10366 | -- in the primitive should be the implementing record type. | |
10367 | ||
10368 | if Ekind (Iface_Typ) = E_Record_Type | |
10369 | and then Is_Interface (Iface_Typ) | |
10370 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
10371 | then | |
10372 | if Prim_Typ /= Typ then | |
10373 | return False; | |
10374 | end if; | |
10375 | ||
10376 | -- The two parameters must be both mode and subtype conformant | |
10377 | ||
10378 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
10379 | or else not | |
10380 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
10381 | then | |
10382 | return False; | |
10383 | end if; | |
10384 | ||
10385 | Next (Iface_Param); | |
10386 | Next (Prim_Param); | |
10387 | end loop; | |
10388 | ||
10389 | -- One of the two lists contains more parameters than the other | |
10390 | ||
10391 | if Present (Iface_Param) or else Present (Prim_Param) then | |
10392 | return False; | |
10393 | end if; | |
10394 | ||
10395 | return True; | |
10396 | end Matches_Prefixed_View_Profile; | |
10397 | ||
10398 | -- Start of processing for Check_Synchronized_Overriding | |
10399 | ||
5d37ba92 ES |
10400 | begin |
10401 | Overridden_Subp := Empty; | |
10402 | ||
8aa15e3b JM |
10403 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
10404 | -- primitives internally generated by the frontend; however at this | |
10405 | -- stage predefined primitives are still not fully decorated. As a | |
10406 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 10407 | |
8aa15e3b JM |
10408 | if (Ekind (Def_Id) /= E_Entry |
10409 | and then Ekind (Def_Id) /= E_Function | |
10410 | and then Ekind (Def_Id) /= E_Procedure) | |
10411 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
10412 | then |
10413 | return; | |
10414 | end if; | |
10415 | ||
10416 | -- Search for the concurrent declaration since it contains the list | |
10417 | -- of all implemented interfaces. In this case, the subprogram is | |
10418 | -- declared within the scope of a protected or a task type. | |
10419 | ||
10420 | if Present (Scope (Def_Id)) | |
10421 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
10422 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
10423 | then | |
10424 | Typ := Scope (Def_Id); | |
10425 | In_Scope := True; | |
10426 | ||
8aa15e3b | 10427 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 10428 | -- has no formals. |
8aa15e3b JM |
10429 | |
10430 | elsif No (First_Formal (Def_Id)) then | |
10431 | return; | |
5d37ba92 | 10432 | |
8aa15e3b | 10433 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 10434 | -- concurrent type. |
5d37ba92 | 10435 | |
8aa15e3b JM |
10436 | else |
10437 | Typ := Etype (First_Formal (Def_Id)); | |
10438 | ||
10439 | if Is_Access_Type (Typ) then | |
10440 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
10441 | end if; |
10442 | ||
8aa15e3b JM |
10443 | if Is_Concurrent_Type (Typ) |
10444 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 10445 | then |
5d37ba92 ES |
10446 | In_Scope := False; |
10447 | ||
10448 | -- This case occurs when the concurrent type is declared within | |
10449 | -- a generic unit. As a result the corresponding record has been | |
10450 | -- built and used as the type of the first formal, we just have | |
10451 | -- to retrieve the corresponding concurrent type. | |
10452 | ||
8aa15e3b | 10453 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 10454 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 10455 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 10456 | then |
8aa15e3b | 10457 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
10458 | In_Scope := False; |
10459 | ||
10460 | else | |
10461 | return; | |
10462 | end if; | |
8aa15e3b JM |
10463 | end if; |
10464 | ||
10465 | -- There is no overriding to check if is an inherited operation in a | |
10466 | -- type derivation on for a generic actual. | |
10467 | ||
10468 | Collect_Interfaces (Typ, Ifaces_List); | |
10469 | ||
10470 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
10471 | return; |
10472 | end if; | |
10473 | ||
8aa15e3b JM |
10474 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
10475 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 10476 | |
8aa15e3b JM |
10477 | declare |
10478 | Candidate : Entity_Id := Empty; | |
10479 | Hom : Entity_Id := Empty; | |
10480 | Iface_Typ : Entity_Id; | |
10481 | Subp : Entity_Id := Empty; | |
10482 | ||
10483 | begin | |
4adf3c50 | 10484 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
10485 | -- overridden subprogram that belongs to an implemented |
10486 | -- interface. | |
10487 | ||
10488 | Hom := Current_Entity_In_Scope (Def_Id); | |
10489 | while Present (Hom) loop | |
10490 | Subp := Hom; | |
10491 | ||
15e4986c JM |
10492 | if Subp = Def_Id |
10493 | or else not Is_Overloadable (Subp) | |
10494 | or else not Is_Primitive (Subp) | |
10495 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 10496 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 10497 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 10498 | then |
15e4986c | 10499 | null; |
8aa15e3b | 10500 | |
15e4986c | 10501 | -- Entries and procedures can override abstract or null |
4adf3c50 | 10502 | -- interface procedures. |
8aa15e3b | 10503 | |
15e4986c | 10504 | elsif (Ekind (Def_Id) = E_Procedure |
8fde064e | 10505 | or else Ekind (Def_Id) = E_Entry) |
8aa15e3b | 10506 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
10507 | and then Matches_Prefixed_View_Profile |
10508 | (Parameter_Specifications (Parent (Def_Id)), | |
10509 | Parameter_Specifications (Parent (Subp))) | |
10510 | then | |
10511 | Candidate := Subp; | |
10512 | ||
15e4986c JM |
10513 | -- For an overridden subprogram Subp, check whether the mode |
10514 | -- of its first parameter is correct depending on the kind | |
10515 | -- of synchronized type. | |
8aa15e3b | 10516 | |
15e4986c JM |
10517 | declare |
10518 | Formal : constant Node_Id := First_Formal (Candidate); | |
10519 | ||
10520 | begin | |
10521 | -- In order for an entry or a protected procedure to | |
10522 | -- override, the first parameter of the overridden | |
10523 | -- routine must be of mode "out", "in out" or | |
10524 | -- access-to-variable. | |
10525 | ||
8fde064e | 10526 | if Ekind_In (Candidate, E_Entry, E_Procedure) |
15e4986c JM |
10527 | and then Is_Protected_Type (Typ) |
10528 | and then Ekind (Formal) /= E_In_Out_Parameter | |
10529 | and then Ekind (Formal) /= E_Out_Parameter | |
8fde064e AC |
10530 | and then Nkind (Parameter_Type (Parent (Formal))) /= |
10531 | N_Access_Definition | |
15e4986c JM |
10532 | then |
10533 | null; | |
10534 | ||
10535 | -- All other cases are OK since a task entry or routine | |
10536 | -- does not have a restriction on the mode of the first | |
10537 | -- parameter of the overridden interface routine. | |
10538 | ||
10539 | else | |
10540 | Overridden_Subp := Candidate; | |
10541 | return; | |
10542 | end if; | |
10543 | end; | |
8aa15e3b JM |
10544 | |
10545 | -- Functions can override abstract interface functions | |
10546 | ||
10547 | elsif Ekind (Def_Id) = E_Function | |
10548 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
10549 | and then Matches_Prefixed_View_Profile |
10550 | (Parameter_Specifications (Parent (Def_Id)), | |
10551 | Parameter_Specifications (Parent (Subp))) | |
10552 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
10553 | Etype (Result_Definition (Parent (Subp))) | |
10554 | then | |
10555 | Overridden_Subp := Subp; | |
10556 | return; | |
10557 | end if; | |
10558 | ||
10559 | Hom := Homonym (Hom); | |
10560 | end loop; | |
10561 | ||
4adf3c50 AC |
10562 | -- After examining all candidates for overriding, we are left with |
10563 | -- the best match which is a mode incompatible interface routine. | |
10564 | -- Do not emit an error if the Expander is active since this error | |
10565 | -- will be detected later on after all concurrent types are | |
10566 | -- expanded and all wrappers are built. This check is meant for | |
10567 | -- spec-only compilations. | |
8aa15e3b | 10568 | |
4adf3c50 | 10569 | if Present (Candidate) and then not Expander_Active then |
8aa15e3b JM |
10570 | Iface_Typ := |
10571 | Find_Parameter_Type (Parent (First_Formal (Candidate))); | |
10572 | ||
4adf3c50 AC |
10573 | -- Def_Id is primitive of a protected type, declared inside the |
10574 | -- type, and the candidate is primitive of a limited or | |
10575 | -- synchronized interface. | |
8aa15e3b JM |
10576 | |
10577 | if In_Scope | |
10578 | and then Is_Protected_Type (Typ) | |
10579 | and then | |
10580 | (Is_Limited_Interface (Iface_Typ) | |
c199ccf7 AC |
10581 | or else Is_Protected_Interface (Iface_Typ) |
10582 | or else Is_Synchronized_Interface (Iface_Typ) | |
10583 | or else Is_Task_Interface (Iface_Typ)) | |
8aa15e3b | 10584 | then |
dd54644b | 10585 | Error_Msg_PT (Parent (Typ), Candidate); |
8aa15e3b | 10586 | end if; |
5d37ba92 | 10587 | end if; |
8aa15e3b JM |
10588 | |
10589 | Overridden_Subp := Candidate; | |
10590 | return; | |
10591 | end; | |
5d37ba92 ES |
10592 | end Check_Synchronized_Overriding; |
10593 | ||
10594 | ---------------------------- | |
10595 | -- Is_Private_Declaration -- | |
10596 | ---------------------------- | |
10597 | ||
10598 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
10599 | Priv_Decls : List_Id; | |
10600 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
10601 | ||
10602 | begin | |
10603 | if Is_Package_Or_Generic_Package (Current_Scope) | |
10604 | and then In_Private_Part (Current_Scope) | |
10605 | then | |
10606 | Priv_Decls := | |
d12b19fa | 10607 | Private_Declarations (Package_Specification (Current_Scope)); |
5d37ba92 ES |
10608 | |
10609 | return In_Package_Body (Current_Scope) | |
10610 | or else | |
10611 | (Is_List_Member (Decl) | |
a4901c08 | 10612 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 10613 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
10614 | and then not |
10615 | Is_Compilation_Unit | |
10616 | (Defining_Entity (Parent (Decl))) | |
10617 | and then List_Containing (Parent (Parent (Decl))) = | |
10618 | Priv_Decls); | |
5d37ba92 ES |
10619 | else |
10620 | return False; | |
10621 | end if; | |
10622 | end Is_Private_Declaration; | |
996ae0b0 | 10623 | |
2ddc2000 AC |
10624 | -------------------------- |
10625 | -- Is_Overriding_Alias -- | |
10626 | -------------------------- | |
10627 | ||
10628 | function Is_Overriding_Alias | |
10629 | (Old_E : Entity_Id; | |
10630 | New_E : Entity_Id) return Boolean | |
10631 | is | |
10632 | AO : constant Entity_Id := Alias (Old_E); | |
10633 | AN : constant Entity_Id := Alias (New_E); | |
10634 | ||
10635 | begin | |
10636 | return Scope (AO) /= Scope (AN) | |
10637 | or else No (DTC_Entity (AO)) | |
10638 | or else No (DTC_Entity (AN)) | |
10639 | or else DT_Position (AO) = DT_Position (AN); | |
10640 | end Is_Overriding_Alias; | |
10641 | ||
996ae0b0 RK |
10642 | -- Start of processing for New_Overloaded_Entity |
10643 | ||
10644 | begin | |
fbf5a39b AC |
10645 | -- We need to look for an entity that S may override. This must be a |
10646 | -- homonym in the current scope, so we look for the first homonym of | |
10647 | -- S in the current scope as the starting point for the search. | |
10648 | ||
10649 | E := Current_Entity_In_Scope (S); | |
10650 | ||
947430d5 AC |
10651 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
10652 | -- They are directly added to the list of primitive operations of | |
10653 | -- Derived_Type, unless this is a rederivation in the private part | |
10654 | -- of an operation that was already derived in the visible part of | |
10655 | -- the current package. | |
10656 | ||
0791fbe9 | 10657 | if Ada_Version >= Ada_2005 |
947430d5 AC |
10658 | and then Present (Derived_Type) |
10659 | and then Present (Alias (S)) | |
10660 | and then Is_Dispatching_Operation (Alias (S)) | |
10661 | and then Present (Find_Dispatching_Type (Alias (S))) | |
10662 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
10663 | then | |
10664 | -- For private types, when the full-view is processed we propagate to | |
10665 | -- the full view the non-overridden entities whose attribute "alias" | |
10666 | -- references an interface primitive. These entities were added by | |
10667 | -- Derive_Subprograms to ensure that interface primitives are | |
10668 | -- covered. | |
10669 | ||
10670 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
10671 | -- internal entity that links an interface primitive with its | |
10672 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 10673 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
10674 | |
10675 | if Inside_Freezing_Actions = 0 | |
10676 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
10677 | and then In_Private_Part (Current_Scope) | |
10678 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
10679 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
10680 | and then Full_View (Defining_Identifier (Parent (E))) | |
10681 | = Defining_Identifier (Parent (S)) | |
10682 | and then Alias (E) = Alias (S) | |
10683 | then | |
10684 | Check_Operation_From_Private_View (S, E); | |
10685 | Set_Is_Dispatching_Operation (S); | |
10686 | ||
10687 | -- Common case | |
10688 | ||
10689 | else | |
10690 | Enter_Overloaded_Entity (S); | |
10691 | Check_Dispatching_Operation (S, Empty); | |
10692 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
10693 | end if; | |
10694 | ||
10695 | return; | |
10696 | end if; | |
10697 | ||
fbf5a39b AC |
10698 | -- If there is no homonym then this is definitely not overriding |
10699 | ||
996ae0b0 RK |
10700 | if No (E) then |
10701 | Enter_Overloaded_Entity (S); | |
10702 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 10703 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 10704 | |
2995860f AC |
10705 | -- If subprogram has an explicit declaration, check whether it has an |
10706 | -- overriding indicator. | |
758c442c | 10707 | |
ec4867fa | 10708 | if Comes_From_Source (S) then |
8aa15e3b | 10709 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
10710 | |
10711 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
10712 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 10713 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
10714 | -- overriding indicator. |
10715 | ||
10716 | if Ada_Version >= Ada_2012 | |
10717 | and then No (Overridden_Subp) | |
10718 | and then Is_Dispatching_Operation (S) | |
038140ed | 10719 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
10720 | then |
10721 | Overridden_Subp := Overridden_Operation (S); | |
10722 | end if; | |
10723 | ||
5d37ba92 ES |
10724 | Check_Overriding_Indicator |
10725 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
758c442c GD |
10726 | end if; |
10727 | ||
fbf5a39b AC |
10728 | -- If there is a homonym that is not overloadable, then we have an |
10729 | -- error, except for the special cases checked explicitly below. | |
10730 | ||
996ae0b0 RK |
10731 | elsif not Is_Overloadable (E) then |
10732 | ||
10733 | -- Check for spurious conflict produced by a subprogram that has the | |
10734 | -- same name as that of the enclosing generic package. The conflict | |
10735 | -- occurs within an instance, between the subprogram and the renaming | |
10736 | -- declaration for the package. After the subprogram, the package | |
10737 | -- renaming declaration becomes hidden. | |
10738 | ||
10739 | if Ekind (E) = E_Package | |
10740 | and then Present (Renamed_Object (E)) | |
10741 | and then Renamed_Object (E) = Current_Scope | |
10742 | and then Nkind (Parent (Renamed_Object (E))) = | |
10743 | N_Package_Specification | |
10744 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
10745 | then | |
10746 | Set_Is_Hidden (E); | |
10747 | Set_Is_Immediately_Visible (E, False); | |
10748 | Enter_Overloaded_Entity (S); | |
10749 | Set_Homonym (S, Homonym (E)); | |
10750 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 10751 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
10752 | |
10753 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
10754 | -- declaration. However if it is dispatching, it must appear in the |
10755 | -- dispatch table anyway, because it can be dispatched to even if it | |
10756 | -- cannot be called directly. | |
996ae0b0 | 10757 | |
4adf3c50 | 10758 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
10759 | Set_Scope (S, Current_Scope); |
10760 | ||
10761 | if Is_Dispatching_Operation (Alias (S)) then | |
10762 | Check_Dispatching_Operation (S, Empty); | |
10763 | end if; | |
10764 | ||
10765 | return; | |
10766 | ||
10767 | else | |
10768 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 10769 | |
f3d57416 | 10770 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
10771 | |
10772 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
10773 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
10774 | Error_Msg_N ("\& conflicts with declaration#", S); | |
10775 | else | |
10776 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
10777 | end if; |
10778 | ||
10779 | return; | |
10780 | end if; | |
10781 | ||
fbf5a39b AC |
10782 | -- E exists and is overloadable |
10783 | ||
996ae0b0 | 10784 | else |
8aa15e3b | 10785 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 10786 | |
82c80734 RD |
10787 | -- Loop through E and its homonyms to determine if any of them is |
10788 | -- the candidate for overriding by S. | |
996ae0b0 RK |
10789 | |
10790 | while Present (E) loop | |
fbf5a39b AC |
10791 | |
10792 | -- Definitely not interesting if not in the current scope | |
10793 | ||
996ae0b0 RK |
10794 | if Scope (E) /= Current_Scope then |
10795 | null; | |
10796 | ||
aca90db9 AC |
10797 | -- A function can overload the name of an abstract state. The |
10798 | -- state can be viewed as a function with a profile that cannot | |
10799 | -- be matched by anything. | |
10800 | ||
10801 | elsif Ekind (S) = E_Function | |
10802 | and then Ekind (E) = E_Abstract_State | |
10803 | then | |
10804 | Enter_Overloaded_Entity (S); | |
10805 | return; | |
10806 | ||
2995860f AC |
10807 | -- Ada 2012 (AI05-0165): For internally generated bodies of null |
10808 | -- procedures locate the internally generated spec. We enforce | |
10809 | -- mode conformance since a tagged type may inherit from | |
10810 | -- interfaces several null primitives which differ only in | |
10811 | -- the mode of the formals. | |
25ebc085 AC |
10812 | |
10813 | elsif not Comes_From_Source (S) | |
10814 | and then Is_Null_Procedure (S) | |
10815 | and then not Mode_Conformant (E, S) | |
10816 | then | |
10817 | null; | |
10818 | ||
fbf5a39b AC |
10819 | -- Check if we have type conformance |
10820 | ||
ec4867fa | 10821 | elsif Type_Conformant (E, S) then |
c8ef728f | 10822 | |
82c80734 RD |
10823 | -- If the old and new entities have the same profile and one |
10824 | -- is not the body of the other, then this is an error, unless | |
10825 | -- one of them is implicitly declared. | |
996ae0b0 RK |
10826 | |
10827 | -- There are some cases when both can be implicit, for example | |
10828 | -- when both a literal and a function that overrides it are | |
f3d57416 | 10829 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 10830 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 10831 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 10832 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
10833 | -- the former, and the literal is always the former. In the |
10834 | -- odd case where both are derived operations declared at the | |
10835 | -- same point, both operations should be declared, and in that | |
10836 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
10837 | -- part. This can only occur for certain obscure cases in |
10838 | -- instances, when an operation on a type derived from a formal | |
10839 | -- private type does not override a homograph inherited from | |
10840 | -- the actual. In subsequent derivations of such a type, the | |
10841 | -- DT positions of these operations remain distinct, if they | |
10842 | -- have been set. | |
996ae0b0 RK |
10843 | |
10844 | if Present (Alias (S)) | |
10845 | and then (No (Alias (E)) | |
10846 | or else Comes_From_Source (E) | |
2ddc2000 | 10847 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
10848 | or else |
10849 | (Is_Dispatching_Operation (E) | |
2ddc2000 | 10850 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 10851 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 10852 | then |
82c80734 RD |
10853 | -- When an derived operation is overloaded it may be due to |
10854 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
10855 | -- re-inherits. It has to be dealt with. |
10856 | ||
e660dbf7 | 10857 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
10858 | and then In_Private_Part (Current_Scope) |
10859 | then | |
10860 | Check_Operation_From_Private_View (S, E); | |
10861 | end if; | |
10862 | ||
038140ed AC |
10863 | -- In any case the implicit operation remains hidden by the |
10864 | -- existing declaration, which is overriding. Indicate that | |
10865 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 10866 | |
038140ed AC |
10867 | if Present (Alias (S)) then |
10868 | Set_Overridden_Operation (E, Alias (S)); | |
10869 | else | |
10870 | Set_Overridden_Operation (E, S); | |
10871 | end if; | |
758c442c GD |
10872 | |
10873 | if Comes_From_Source (E) then | |
5d37ba92 | 10874 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
758c442c GD |
10875 | end if; |
10876 | ||
996ae0b0 RK |
10877 | return; |
10878 | ||
26a43556 AC |
10879 | -- Within an instance, the renaming declarations for actual |
10880 | -- subprograms may become ambiguous, but they do not hide each | |
10881 | -- other. | |
996ae0b0 RK |
10882 | |
10883 | elsif Ekind (E) /= E_Entry | |
10884 | and then not Comes_From_Source (E) | |
10885 | and then not Is_Generic_Instance (E) | |
10886 | and then (Present (Alias (E)) | |
10887 | or else Is_Intrinsic_Subprogram (E)) | |
10888 | and then (not In_Instance | |
10889 | or else No (Parent (E)) | |
10890 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 10891 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 10892 | then |
26a43556 AC |
10893 | -- A subprogram child unit is not allowed to override an |
10894 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
10895 | |
10896 | if Is_Child_Unit (S) then | |
10897 | Error_Msg_N | |
10898 | ("child unit overrides inherited subprogram in parent", | |
10899 | S); | |
10900 | return; | |
10901 | end if; | |
10902 | ||
10903 | if Is_Non_Overriding_Operation (E, S) then | |
10904 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 10905 | |
c8ef728f | 10906 | if No (Derived_Type) |
996ae0b0 RK |
10907 | or else Is_Tagged_Type (Derived_Type) |
10908 | then | |
10909 | Check_Dispatching_Operation (S, Empty); | |
10910 | end if; | |
10911 | ||
10912 | return; | |
10913 | end if; | |
10914 | ||
10915 | -- E is a derived operation or an internal operator which | |
10916 | -- is being overridden. Remove E from further visibility. | |
10917 | -- Furthermore, if E is a dispatching operation, it must be | |
10918 | -- replaced in the list of primitive operations of its type | |
10919 | -- (see Override_Dispatching_Operation). | |
10920 | ||
ec4867fa | 10921 | Overridden_Subp := E; |
758c442c | 10922 | |
996ae0b0 RK |
10923 | declare |
10924 | Prev : Entity_Id; | |
10925 | ||
10926 | begin | |
10927 | Prev := First_Entity (Current_Scope); | |
8fde064e | 10928 | while Present (Prev) and then Next_Entity (Prev) /= E loop |
996ae0b0 RK |
10929 | Next_Entity (Prev); |
10930 | end loop; | |
10931 | ||
10932 | -- It is possible for E to be in the current scope and | |
10933 | -- yet not in the entity chain. This can only occur in a | |
10934 | -- generic context where E is an implicit concatenation | |
10935 | -- in the formal part, because in a generic body the | |
10936 | -- entity chain starts with the formals. | |
10937 | ||
10938 | pragma Assert | |
10939 | (Present (Prev) or else Chars (E) = Name_Op_Concat); | |
10940 | ||
10941 | -- E must be removed both from the entity_list of the | |
10942 | -- current scope, and from the visibility chain | |
10943 | ||
10944 | if Debug_Flag_E then | |
10945 | Write_Str ("Override implicit operation "); | |
10946 | Write_Int (Int (E)); | |
10947 | Write_Eol; | |
10948 | end if; | |
10949 | ||
10950 | -- If E is a predefined concatenation, it stands for four | |
10951 | -- different operations. As a result, a single explicit | |
10952 | -- declaration does not hide it. In a possible ambiguous | |
10953 | -- situation, Disambiguate chooses the user-defined op, | |
10954 | -- so it is correct to retain the previous internal one. | |
10955 | ||
10956 | if Chars (E) /= Name_Op_Concat | |
10957 | or else Ekind (E) /= E_Operator | |
10958 | then | |
10959 | -- For nondispatching derived operations that are | |
10960 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
10961 | -- part of a package, we retain the derived subprogram |
10962 | -- but mark it as not immediately visible. If the | |
10963 | -- derived operation was declared in the visible part | |
10964 | -- then this ensures that it will still be visible | |
10965 | -- outside the package with the proper signature | |
10966 | -- (calls from outside must also be directed to this | |
10967 | -- version rather than the overriding one, unlike the | |
10968 | -- dispatching case). Calls from inside the package | |
10969 | -- will still resolve to the overriding subprogram | |
10970 | -- since the derived one is marked as not visible | |
10971 | -- within the package. | |
996ae0b0 RK |
10972 | |
10973 | -- If the private operation is dispatching, we achieve | |
10974 | -- the overriding by keeping the implicit operation | |
9865d858 | 10975 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
10976 | -- this fashion the proper body is executed in all |
10977 | -- cases, but the original signature is used outside | |
10978 | -- of the package. | |
10979 | ||
10980 | -- If the overriding is not in the private part, we | |
10981 | -- remove the implicit operation altogether. | |
10982 | ||
10983 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
10984 | if not Is_Dispatching_Operation (E) then |
10985 | Set_Is_Immediately_Visible (E, False); | |
10986 | else | |
e895b435 | 10987 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 10988 | -- so nothing else needs to be done here. |
996ae0b0 RK |
10989 | |
10990 | null; | |
10991 | end if; | |
996ae0b0 | 10992 | |
fbf5a39b AC |
10993 | else |
10994 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
10995 | |
10996 | if E = Current_Entity (E) then | |
10997 | Prev_Vis := Empty; | |
10998 | else | |
10999 | Prev_Vis := Current_Entity (E); | |
11000 | while Homonym (Prev_Vis) /= E loop | |
11001 | Prev_Vis := Homonym (Prev_Vis); | |
11002 | end loop; | |
11003 | end if; | |
11004 | ||
11005 | if Prev_Vis /= Empty then | |
11006 | ||
11007 | -- Skip E in the visibility chain | |
11008 | ||
11009 | Set_Homonym (Prev_Vis, Homonym (E)); | |
11010 | ||
11011 | else | |
11012 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
11013 | end if; | |
11014 | ||
11015 | Set_Next_Entity (Prev, Next_Entity (E)); | |
11016 | ||
11017 | if No (Next_Entity (Prev)) then | |
11018 | Set_Last_Entity (Current_Scope, Prev); | |
11019 | end if; | |
996ae0b0 RK |
11020 | end if; |
11021 | end if; | |
11022 | ||
11023 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
11024 | |
11025 | -- For entities generated by Derive_Subprograms the | |
11026 | -- overridden operation is the inherited primitive | |
11027 | -- (which is available through the attribute alias). | |
11028 | ||
11029 | if not (Comes_From_Source (E)) | |
11030 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
11031 | and then Find_Dispatching_Type (E) = |
11032 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
11033 | and then Present (Alias (E)) |
11034 | and then Comes_From_Source (Alias (E)) | |
11035 | then | |
11036 | Set_Overridden_Operation (S, Alias (E)); | |
2fe829ae | 11037 | |
6320f5e1 AC |
11038 | -- Normal case of setting entity as overridden |
11039 | ||
11040 | -- Note: Static_Initialization and Overridden_Operation | |
11041 | -- attributes use the same field in subprogram entities. | |
11042 | -- Static_Initialization is only defined for internal | |
11043 | -- initialization procedures, where Overridden_Operation | |
11044 | -- is irrelevant. Therefore the setting of this attribute | |
11045 | -- must check whether the target is an init_proc. | |
11046 | ||
2fe829ae | 11047 | elsif not Is_Init_Proc (S) then |
1c1289e7 AC |
11048 | Set_Overridden_Operation (S, E); |
11049 | end if; | |
11050 | ||
5d37ba92 | 11051 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 11052 | |
fc53fe76 | 11053 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
11054 | -- expanded to override an inherited null procedure, or a |
11055 | -- predefined dispatching primitive then indicate that E | |
038140ed | 11056 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
11057 | |
11058 | if Comes_From_Source (S) | |
11059 | or else | |
11060 | (Present (Parent (S)) | |
11061 | and then | |
11062 | Nkind (Parent (S)) = N_Procedure_Specification | |
11063 | and then | |
11064 | Null_Present (Parent (S))) | |
38ef8ebe AC |
11065 | or else |
11066 | (Present (Alias (E)) | |
f16e8df9 RD |
11067 | and then |
11068 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 11069 | then |
c8ef728f | 11070 | if Present (Alias (E)) then |
41251c60 | 11071 | Set_Overridden_Operation (S, Alias (E)); |
41251c60 JM |
11072 | end if; |
11073 | end if; | |
11074 | ||
996ae0b0 | 11075 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 11076 | |
82c80734 | 11077 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 11078 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
11079 | |
11080 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
11081 | Check_Dispatching_Operation (S, E); |
11082 | ||
996ae0b0 RK |
11083 | else |
11084 | Check_Dispatching_Operation (S, Empty); | |
11085 | end if; | |
11086 | ||
5d37ba92 ES |
11087 | Check_For_Primitive_Subprogram |
11088 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
11089 | goto Check_Inequality; |
11090 | end; | |
11091 | ||
11092 | -- Apparent redeclarations in instances can occur when two | |
11093 | -- formal types get the same actual type. The subprograms in | |
11094 | -- in the instance are legal, even if not callable from the | |
11095 | -- outside. Calls from within are disambiguated elsewhere. | |
11096 | -- For dispatching operations in the visible part, the usual | |
11097 | -- rules apply, and operations with the same profile are not | |
11098 | -- legal (B830001). | |
11099 | ||
11100 | elsif (In_Instance_Visible_Part | |
11101 | and then not Is_Dispatching_Operation (E)) | |
11102 | or else In_Instance_Not_Visible | |
11103 | then | |
11104 | null; | |
11105 | ||
11106 | -- Here we have a real error (identical profile) | |
11107 | ||
11108 | else | |
11109 | Error_Msg_Sloc := Sloc (E); | |
11110 | ||
11111 | -- Avoid cascaded errors if the entity appears in | |
11112 | -- subsequent calls. | |
11113 | ||
11114 | Set_Scope (S, Current_Scope); | |
11115 | ||
5d37ba92 ES |
11116 | -- Generate error, with extra useful warning for the case |
11117 | -- of a generic instance with no completion. | |
996ae0b0 RK |
11118 | |
11119 | if Is_Generic_Instance (S) | |
11120 | and then not Has_Completion (E) | |
11121 | then | |
11122 | Error_Msg_N | |
5d37ba92 ES |
11123 | ("instantiation cannot provide body for&", S); |
11124 | Error_Msg_N ("\& conflicts with declaration#", S); | |
11125 | else | |
11126 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
11127 | end if; |
11128 | ||
11129 | return; | |
11130 | end if; | |
11131 | ||
11132 | else | |
c8ef728f ES |
11133 | -- If one subprogram has an access parameter and the other |
11134 | -- a parameter of an access type, calls to either might be | |
11135 | -- ambiguous. Verify that parameters match except for the | |
11136 | -- access parameter. | |
11137 | ||
11138 | if May_Hide_Profile then | |
11139 | declare | |
ec4867fa ES |
11140 | F1 : Entity_Id; |
11141 | F2 : Entity_Id; | |
8dbd1460 | 11142 | |
c8ef728f ES |
11143 | begin |
11144 | F1 := First_Formal (S); | |
11145 | F2 := First_Formal (E); | |
11146 | while Present (F1) and then Present (F2) loop | |
11147 | if Is_Access_Type (Etype (F1)) then | |
11148 | if not Is_Access_Type (Etype (F2)) | |
11149 | or else not Conforming_Types | |
11150 | (Designated_Type (Etype (F1)), | |
11151 | Designated_Type (Etype (F2)), | |
11152 | Type_Conformant) | |
11153 | then | |
11154 | May_Hide_Profile := False; | |
11155 | end if; | |
11156 | ||
11157 | elsif | |
11158 | not Conforming_Types | |
11159 | (Etype (F1), Etype (F2), Type_Conformant) | |
11160 | then | |
11161 | May_Hide_Profile := False; | |
11162 | end if; | |
11163 | ||
11164 | Next_Formal (F1); | |
11165 | Next_Formal (F2); | |
11166 | end loop; | |
11167 | ||
11168 | if May_Hide_Profile | |
11169 | and then No (F1) | |
11170 | and then No (F2) | |
11171 | then | |
dbfeb4fa | 11172 | Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
c8ef728f ES |
11173 | end if; |
11174 | end; | |
11175 | end if; | |
996ae0b0 RK |
11176 | end if; |
11177 | ||
996ae0b0 RK |
11178 | E := Homonym (E); |
11179 | end loop; | |
11180 | ||
11181 | -- On exit, we know that S is a new entity | |
11182 | ||
11183 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
11184 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
11185 | Check_Overriding_Indicator | |
11186 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 11187 | |
c4d67e2d | 11188 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 11189 | |
c4d67e2d AC |
11190 | if Nkind (S) /= N_Defining_Operator_Symbol then |
11191 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
11192 | Check_SPARK_Restriction | |
11193 | ("overloading not allowed with entity#", S); | |
11194 | end if; | |
8ed68165 | 11195 | |
82c80734 RD |
11196 | -- If S is a derived operation for an untagged type then by |
11197 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
11198 | -- operation was dispatching), so Check_Dispatching_Operation is not |
11199 | -- called in that case. | |
996ae0b0 | 11200 | |
c8ef728f | 11201 | if No (Derived_Type) |
996ae0b0 RK |
11202 | or else Is_Tagged_Type (Derived_Type) |
11203 | then | |
11204 | Check_Dispatching_Operation (S, Empty); | |
11205 | end if; | |
11206 | end if; | |
11207 | ||
82c80734 RD |
11208 | -- If this is a user-defined equality operator that is not a derived |
11209 | -- subprogram, create the corresponding inequality. If the operation is | |
11210 | -- dispatching, the expansion is done elsewhere, and we do not create | |
11211 | -- an explicit inequality operation. | |
996ae0b0 RK |
11212 | |
11213 | <<Check_Inequality>> | |
11214 | if Chars (S) = Name_Op_Eq | |
11215 | and then Etype (S) = Standard_Boolean | |
11216 | and then Present (Parent (S)) | |
11217 | and then not Is_Dispatching_Operation (S) | |
11218 | then | |
11219 | Make_Inequality_Operator (S); | |
b2834fbd | 11220 | Check_Untagged_Equality (S); |
996ae0b0 | 11221 | end if; |
996ae0b0 RK |
11222 | end New_Overloaded_Entity; |
11223 | ||
11224 | --------------------- | |
11225 | -- Process_Formals -- | |
11226 | --------------------- | |
11227 | ||
11228 | procedure Process_Formals | |
07fc65c4 | 11229 | (T : List_Id; |
996ae0b0 RK |
11230 | Related_Nod : Node_Id) |
11231 | is | |
11232 | Param_Spec : Node_Id; | |
11233 | Formal : Entity_Id; | |
11234 | Formal_Type : Entity_Id; | |
11235 | Default : Node_Id; | |
11236 | Ptype : Entity_Id; | |
11237 | ||
800621e0 RD |
11238 | Num_Out_Params : Nat := 0; |
11239 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 11240 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 11241 | |
7b56a91b | 11242 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
950d217a AC |
11243 | -- Determine whether an access type designates a type coming from a |
11244 | -- limited view. | |
11245 | ||
07fc65c4 | 11246 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
11247 | -- Check whether the default has a class-wide type. After analysis the |
11248 | -- default has the type of the formal, so we must also check explicitly | |
11249 | -- for an access attribute. | |
07fc65c4 | 11250 | |
7b56a91b AC |
11251 | ---------------------------------- |
11252 | -- Designates_From_Limited_With -- | |
11253 | ---------------------------------- | |
950d217a | 11254 | |
7b56a91b | 11255 | function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
950d217a AC |
11256 | Desig : Entity_Id := Typ; |
11257 | ||
11258 | begin | |
11259 | if Is_Access_Type (Desig) then | |
11260 | Desig := Directly_Designated_Type (Desig); | |
11261 | end if; | |
11262 | ||
11263 | if Is_Class_Wide_Type (Desig) then | |
11264 | Desig := Root_Type (Desig); | |
11265 | end if; | |
11266 | ||
11267 | return | |
7b56a91b AC |
11268 | Ekind (Desig) = E_Incomplete_Type |
11269 | and then From_Limited_With (Desig); | |
11270 | end Designates_From_Limited_With; | |
950d217a | 11271 | |
07fc65c4 GB |
11272 | --------------------------- |
11273 | -- Is_Class_Wide_Default -- | |
11274 | --------------------------- | |
11275 | ||
11276 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
11277 | begin | |
11278 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
11279 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
11280 | and then Attribute_Name (D) = Name_Access |
11281 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
11282 | end Is_Class_Wide_Default; |
11283 | ||
11284 | -- Start of processing for Process_Formals | |
11285 | ||
996ae0b0 RK |
11286 | begin |
11287 | -- In order to prevent premature use of the formals in the same formal | |
11288 | -- part, the Ekind is left undefined until all default expressions are | |
11289 | -- analyzed. The Ekind is established in a separate loop at the end. | |
11290 | ||
11291 | Param_Spec := First (T); | |
996ae0b0 | 11292 | while Present (Param_Spec) loop |
996ae0b0 | 11293 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 11294 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
11295 | Enter_Name (Formal); |
11296 | ||
11297 | -- Case of ordinary parameters | |
11298 | ||
11299 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
11300 | Find_Type (Parameter_Type (Param_Spec)); | |
11301 | Ptype := Parameter_Type (Param_Spec); | |
11302 | ||
11303 | if Ptype = Error then | |
11304 | goto Continue; | |
11305 | end if; | |
11306 | ||
11307 | Formal_Type := Entity (Ptype); | |
11308 | ||
ec4867fa ES |
11309 | if Is_Incomplete_Type (Formal_Type) |
11310 | or else | |
11311 | (Is_Class_Wide_Type (Formal_Type) | |
8fde064e | 11312 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
996ae0b0 | 11313 | then |
93bcda23 AC |
11314 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
11315 | -- primitive operations, as long as their completion is | |
11316 | -- in the same declarative part. If in the private part | |
11317 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
11318 | -- Check is done on package exit. For access to subprograms, |
11319 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 11320 | |
6eddd7b4 AC |
11321 | -- Ada 2012: tagged incomplete types are allowed as generic |
11322 | -- formal types. They do not introduce dependencies and the | |
11323 | -- corresponding generic subprogram does not have a delayed | |
5b6f12c7 AC |
11324 | -- freeze, because it does not need a freeze node. However, |
11325 | -- it is still the case that untagged incomplete types cannot | |
11326 | -- be Taft-amendment types and must be completed in private | |
11327 | -- part, so the subprogram must appear in the list of private | |
11328 | -- dependents of the type. | |
11329 | ||
11330 | if Is_Tagged_Type (Formal_Type) | |
11331 | or else Ada_Version >= Ada_2012 | |
11332 | then | |
93bcda23 | 11333 | if Ekind (Scope (Current_Scope)) = E_Package |
7b56a91b | 11334 | and then not From_Limited_With (Formal_Type) |
6eddd7b4 | 11335 | and then not Is_Generic_Type (Formal_Type) |
93bcda23 AC |
11336 | and then not Is_Class_Wide_Type (Formal_Type) |
11337 | then | |
cec29135 ES |
11338 | if not Nkind_In |
11339 | (Parent (T), N_Access_Function_Definition, | |
11340 | N_Access_Procedure_Definition) | |
11341 | then | |
11342 | Append_Elmt | |
11343 | (Current_Scope, | |
11344 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
11345 | |
11346 | -- Freezing is delayed to ensure that Register_Prim | |
11347 | -- will get called for this operation, which is needed | |
11348 | -- in cases where static dispatch tables aren't built. | |
11349 | -- (Note that the same is done for controlling access | |
11350 | -- parameter cases in function Access_Definition.) | |
11351 | ||
11352 | Set_Has_Delayed_Freeze (Current_Scope); | |
cec29135 | 11353 | end if; |
93bcda23 | 11354 | end if; |
fbf5a39b | 11355 | |
0a36105d JM |
11356 | -- Special handling of Value_Type for CIL case |
11357 | ||
11358 | elsif Is_Value_Type (Formal_Type) then | |
11359 | null; | |
11360 | ||
800621e0 RD |
11361 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
11362 | N_Access_Procedure_Definition) | |
996ae0b0 | 11363 | then |
dd386db0 AC |
11364 | -- AI05-0151: Tagged incomplete types are allowed in all |
11365 | -- formal parts. Untagged incomplete types are not allowed | |
11366 | -- in bodies. | |
11367 | ||
11368 | if Ada_Version >= Ada_2012 then | |
11369 | if Is_Tagged_Type (Formal_Type) then | |
11370 | null; | |
11371 | ||
0f1a6a0b AC |
11372 | elsif Nkind_In (Parent (Parent (T)), N_Accept_Statement, |
11373 | N_Entry_Body, | |
11374 | N_Subprogram_Body) | |
dd386db0 AC |
11375 | then |
11376 | Error_Msg_NE | |
11377 | ("invalid use of untagged incomplete type&", | |
0f1a6a0b | 11378 | Ptype, Formal_Type); |
dd386db0 AC |
11379 | end if; |
11380 | ||
11381 | else | |
11382 | Error_Msg_NE | |
11383 | ("invalid use of incomplete type&", | |
0f1a6a0b | 11384 | Param_Spec, Formal_Type); |
dd386db0 AC |
11385 | |
11386 | -- Further checks on the legality of incomplete types | |
11387 | -- in formal parts are delayed until the freeze point | |
11388 | -- of the enclosing subprogram or access to subprogram. | |
11389 | end if; | |
996ae0b0 RK |
11390 | end if; |
11391 | ||
11392 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
11393 | Error_Msg_NE |
11394 | ("premature use of&", | |
11395 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
11396 | end if; |
11397 | ||
fecbd779 AC |
11398 | -- Ada 2012 (AI-142): Handle aliased parameters |
11399 | ||
11400 | if Ada_Version >= Ada_2012 | |
11401 | and then Aliased_Present (Param_Spec) | |
11402 | then | |
11403 | Set_Is_Aliased (Formal); | |
11404 | end if; | |
11405 | ||
0ab80019 | 11406 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 11407 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
11408 | -- formal in the enclosing scope. Finally, replace the parameter |
11409 | -- type of the formal with the internal subtype. | |
7324bf49 | 11410 | |
0791fbe9 | 11411 | if Ada_Version >= Ada_2005 |
41251c60 | 11412 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 11413 | then |
ec4867fa | 11414 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 11415 | Error_Msg_N |
0a36105d JM |
11416 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
11417 | ||
ec4867fa ES |
11418 | else |
11419 | if Can_Never_Be_Null (Formal_Type) | |
11420 | and then Comes_From_Source (Related_Nod) | |
11421 | then | |
ed2233dc | 11422 | Error_Msg_NE |
0a36105d | 11423 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 11424 | Param_Spec, Formal_Type); |
ec4867fa | 11425 | end if; |
41251c60 | 11426 | |
ec4867fa ES |
11427 | Formal_Type := |
11428 | Create_Null_Excluding_Itype | |
11429 | (T => Formal_Type, | |
11430 | Related_Nod => Related_Nod, | |
11431 | Scope_Id => Scope (Current_Scope)); | |
0a36105d | 11432 | |
fcf848c4 AC |
11433 | -- If the designated type of the itype is an itype that is |
11434 | -- not frozen yet, we set the Has_Delayed_Freeze attribute | |
11435 | -- on the access subtype, to prevent order-of-elaboration | |
11436 | -- issues in the backend. | |
0a36105d JM |
11437 | |
11438 | -- Example: | |
11439 | -- type T is access procedure; | |
11440 | -- procedure Op (O : not null T); | |
11441 | ||
fcf848c4 AC |
11442 | if Is_Itype (Directly_Designated_Type (Formal_Type)) |
11443 | and then | |
11444 | not Is_Frozen (Directly_Designated_Type (Formal_Type)) | |
11445 | then | |
0a36105d JM |
11446 | Set_Has_Delayed_Freeze (Formal_Type); |
11447 | end if; | |
ec4867fa | 11448 | end if; |
7324bf49 AC |
11449 | end if; |
11450 | ||
996ae0b0 RK |
11451 | -- An access formal type |
11452 | ||
11453 | else | |
11454 | Formal_Type := | |
11455 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 11456 | |
f937473f RD |
11457 | -- No need to continue if we already notified errors |
11458 | ||
11459 | if not Present (Formal_Type) then | |
11460 | return; | |
11461 | end if; | |
11462 | ||
0ab80019 | 11463 | -- Ada 2005 (AI-254) |
7324bf49 | 11464 | |
af4b9434 AC |
11465 | declare |
11466 | AD : constant Node_Id := | |
11467 | Access_To_Subprogram_Definition | |
11468 | (Parameter_Type (Param_Spec)); | |
11469 | begin | |
11470 | if Present (AD) and then Protected_Present (AD) then | |
11471 | Formal_Type := | |
11472 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 11473 | (Param_Spec); |
af4b9434 AC |
11474 | end if; |
11475 | end; | |
996ae0b0 RK |
11476 | end if; |
11477 | ||
11478 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 11479 | |
fecbd779 AC |
11480 | -- Deal with default expression if present |
11481 | ||
fbf5a39b | 11482 | Default := Expression (Param_Spec); |
996ae0b0 RK |
11483 | |
11484 | if Present (Default) then | |
2ba431e5 | 11485 | Check_SPARK_Restriction |
fe5d3068 | 11486 | ("default expression is not allowed", Default); |
38171f43 | 11487 | |
996ae0b0 | 11488 | if Out_Present (Param_Spec) then |
ed2233dc | 11489 | Error_Msg_N |
996ae0b0 RK |
11490 | ("default initialization only allowed for IN parameters", |
11491 | Param_Spec); | |
11492 | end if; | |
11493 | ||
11494 | -- Do the special preanalysis of the expression (see section on | |
11495 | -- "Handling of Default Expressions" in the spec of package Sem). | |
11496 | ||
21d27997 | 11497 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 11498 | |
f29b857f ES |
11499 | -- An access to constant cannot be the default for |
11500 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
11501 | |
11502 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
11503 | and then not Is_Access_Constant (Formal_Type) | |
11504 | and then Is_Access_Type (Etype (Default)) | |
11505 | and then Is_Access_Constant (Etype (Default)) | |
11506 | then | |
f29b857f ES |
11507 | Error_Msg_N |
11508 | ("formal that is access to variable cannot be initialized " & | |
11509 | "with an access-to-constant expression", Default); | |
2eb160f2 ST |
11510 | end if; |
11511 | ||
d8db0bca JM |
11512 | -- Check that the designated type of an access parameter's default |
11513 | -- is not a class-wide type unless the parameter's designated type | |
11514 | -- is also class-wide. | |
996ae0b0 RK |
11515 | |
11516 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
7b56a91b | 11517 | and then not Designates_From_Limited_With (Formal_Type) |
07fc65c4 | 11518 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
11519 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
11520 | then | |
07fc65c4 GB |
11521 | Error_Msg_N |
11522 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 11523 | end if; |
4755cce9 JM |
11524 | |
11525 | -- Check incorrect use of dynamically tagged expressions | |
11526 | ||
11527 | if Is_Tagged_Type (Formal_Type) then | |
11528 | Check_Dynamically_Tagged_Expression | |
11529 | (Expr => Default, | |
11530 | Typ => Formal_Type, | |
11531 | Related_Nod => Default); | |
11532 | end if; | |
996ae0b0 RK |
11533 | end if; |
11534 | ||
41251c60 JM |
11535 | -- Ada 2005 (AI-231): Static checks |
11536 | ||
0791fbe9 | 11537 | if Ada_Version >= Ada_2005 |
41251c60 JM |
11538 | and then Is_Access_Type (Etype (Formal)) |
11539 | and then Can_Never_Be_Null (Etype (Formal)) | |
11540 | then | |
11541 | Null_Exclusion_Static_Checks (Param_Spec); | |
11542 | end if; | |
11543 | ||
f1bd0415 AC |
11544 | -- The following checks are relevant when SPARK_Mode is on as these |
11545 | -- are not standard Ada legality rules. | |
6c3c671e | 11546 | |
ea26c8e4 HK |
11547 | if SPARK_Mode = On then |
11548 | if Ekind_In (Scope (Formal), E_Function, E_Generic_Function) then | |
f1bd0415 | 11549 | |
ea26c8e4 HK |
11550 | -- A function cannot have a parameter of mode IN OUT or OUT |
11551 | -- (SPARK RM 6.1). | |
f1bd0415 | 11552 | |
ea26c8e4 HK |
11553 | if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then |
11554 | Error_Msg_N | |
11555 | ("function cannot have parameter of mode `OUT` or " | |
11556 | & "`IN OUT`", Formal); | |
f1bd0415 | 11557 | |
ea26c8e4 HK |
11558 | -- A function cannot have a volatile formal parameter |
11559 | -- (SPARK RM 7.1.3(10)). | |
11560 | ||
11561 | elsif Is_SPARK_Volatile (Formal) then | |
11562 | Error_Msg_N | |
11563 | ("function cannot have a volatile formal parameter", | |
11564 | Formal); | |
11565 | end if; | |
11566 | ||
11567 | -- A procedure cannot have a formal parameter of mode IN because | |
11568 | -- it behaves as a constant (SPARK RM 7.1.3(6)). | |
11569 | ||
11570 | elsif Ekind (Scope (Formal)) = E_Procedure | |
11571 | and then Ekind (Formal) = E_In_Parameter | |
11572 | and then Is_SPARK_Volatile (Formal) | |
11573 | then | |
f1bd0415 | 11574 | Error_Msg_N |
ea26c8e4 | 11575 | ("formal parameter of mode `IN` cannot be volatile", Formal); |
f1bd0415 | 11576 | end if; |
6c3c671e AC |
11577 | end if; |
11578 | ||
996ae0b0 RK |
11579 | <<Continue>> |
11580 | Next (Param_Spec); | |
11581 | end loop; | |
11582 | ||
82c80734 RD |
11583 | -- If this is the formal part of a function specification, analyze the |
11584 | -- subtype mark in the context where the formals are visible but not | |
11585 | -- yet usable, and may hide outer homographs. | |
11586 | ||
11587 | if Nkind (Related_Nod) = N_Function_Specification then | |
11588 | Analyze_Return_Type (Related_Nod); | |
11589 | end if; | |
11590 | ||
996ae0b0 RK |
11591 | -- Now set the kind (mode) of each formal |
11592 | ||
11593 | Param_Spec := First (T); | |
996ae0b0 RK |
11594 | while Present (Param_Spec) loop |
11595 | Formal := Defining_Identifier (Param_Spec); | |
11596 | Set_Formal_Mode (Formal); | |
11597 | ||
11598 | if Ekind (Formal) = E_In_Parameter then | |
11599 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
11600 | ||
11601 | if Present (Expression (Param_Spec)) then | |
11602 | Default := Expression (Param_Spec); | |
11603 | ||
11604 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
11605 | if Nkind (Parameter_Type (Param_Spec)) /= |
11606 | N_Access_Definition | |
996ae0b0 RK |
11607 | then |
11608 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 11609 | else |
5ebfaacf AC |
11610 | Formal_Type := |
11611 | Access_Definition | |
11612 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
11613 | end if; |
11614 | ||
11615 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
11616 | end if; | |
2820d220 | 11617 | end if; |
800621e0 RD |
11618 | |
11619 | elsif Ekind (Formal) = E_Out_Parameter then | |
11620 | Num_Out_Params := Num_Out_Params + 1; | |
11621 | ||
11622 | if Num_Out_Params = 1 then | |
11623 | First_Out_Param := Formal; | |
11624 | end if; | |
11625 | ||
11626 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
11627 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
11628 | end if; |
11629 | ||
4172a8e3 AC |
11630 | -- Skip remaining processing if formal type was in error |
11631 | ||
11632 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
11633 | goto Next_Parameter; | |
11634 | end if; | |
11635 | ||
fecbd779 AC |
11636 | -- Force call by reference if aliased |
11637 | ||
11638 | if Is_Aliased (Formal) then | |
11639 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf AC |
11640 | |
11641 | -- Warn if user asked this to be passed by copy | |
11642 | ||
11643 | if Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
11644 | Error_Msg_N | |
b785e0b8 | 11645 | ("cannot pass aliased parameter & by copy??", Formal); |
5ebfaacf AC |
11646 | end if; |
11647 | ||
11648 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy | |
11649 | ||
11650 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
11651 | Set_Mechanism (Formal, By_Copy); | |
11652 | ||
11653 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Reference then | |
11654 | Set_Mechanism (Formal, By_Reference); | |
fecbd779 AC |
11655 | end if; |
11656 | ||
4172a8e3 | 11657 | <<Next_Parameter>> |
996ae0b0 RK |
11658 | Next (Param_Spec); |
11659 | end loop; | |
800621e0 RD |
11660 | |
11661 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
11662 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
11663 | end if; | |
996ae0b0 RK |
11664 | end Process_Formals; |
11665 | ||
fbf5a39b AC |
11666 | ---------------------------- |
11667 | -- Reference_Body_Formals -- | |
11668 | ---------------------------- | |
11669 | ||
11670 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
11671 | Fs : Entity_Id; | |
11672 | Fb : Entity_Id; | |
11673 | ||
11674 | begin | |
11675 | if Error_Posted (Spec) then | |
11676 | return; | |
11677 | end if; | |
11678 | ||
0a36105d JM |
11679 | -- Iterate over both lists. They may be of different lengths if the two |
11680 | -- specs are not conformant. | |
11681 | ||
fbf5a39b AC |
11682 | Fs := First_Formal (Spec); |
11683 | Fb := First_Formal (Bod); | |
0a36105d | 11684 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
11685 | Generate_Reference (Fs, Fb, 'b'); |
11686 | ||
11687 | if Style_Check then | |
11688 | Style.Check_Identifier (Fb, Fs); | |
11689 | end if; | |
11690 | ||
11691 | Set_Spec_Entity (Fb, Fs); | |
11692 | Set_Referenced (Fs, False); | |
11693 | Next_Formal (Fs); | |
11694 | Next_Formal (Fb); | |
11695 | end loop; | |
11696 | end Reference_Body_Formals; | |
11697 | ||
996ae0b0 RK |
11698 | ------------------------- |
11699 | -- Set_Actual_Subtypes -- | |
11700 | ------------------------- | |
11701 | ||
11702 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
2820d220 AC |
11703 | Decl : Node_Id; |
11704 | Formal : Entity_Id; | |
11705 | T : Entity_Id; | |
11706 | First_Stmt : Node_Id := Empty; | |
11707 | AS_Needed : Boolean; | |
996ae0b0 RK |
11708 | |
11709 | begin | |
f3d57416 | 11710 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
11711 | -- actual subtypes (small optimization). |
11712 | ||
8fde064e | 11713 | if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
fbf5a39b AC |
11714 | return; |
11715 | end if; | |
11716 | ||
996ae0b0 RK |
11717 | Formal := First_Formal (Subp); |
11718 | while Present (Formal) loop | |
11719 | T := Etype (Formal); | |
11720 | ||
e895b435 | 11721 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
11722 | |
11723 | if Is_Constrained (T) then | |
11724 | AS_Needed := False; | |
11725 | ||
82c80734 | 11726 | -- If we have unknown discriminants, then we do not need an actual |
a90bd866 | 11727 | -- subtype, or more accurately we cannot figure it out. Note that |
82c80734 | 11728 | -- all class-wide types have unknown discriminants. |
996ae0b0 RK |
11729 | |
11730 | elsif Has_Unknown_Discriminants (T) then | |
11731 | AS_Needed := False; | |
11732 | ||
82c80734 RD |
11733 | -- At this stage we have an unconstrained type that may need an |
11734 | -- actual subtype. For sure the actual subtype is needed if we have | |
11735 | -- an unconstrained array type. | |
996ae0b0 RK |
11736 | |
11737 | elsif Is_Array_Type (T) then | |
11738 | AS_Needed := True; | |
11739 | ||
d8db0bca JM |
11740 | -- The only other case needing an actual subtype is an unconstrained |
11741 | -- record type which is an IN parameter (we cannot generate actual | |
11742 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
11743 | -- change the discriminant values. However we exclude the case of | |
11744 | -- initialization procedures, since discriminants are handled very | |
11745 | -- specially in this context, see the section entitled "Handling of | |
11746 | -- Discriminants" in Einfo. | |
11747 | ||
11748 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
11749 | -- in front end layout mode for size/offset values), since in such | |
11750 | -- functions only discriminants are referenced, and not only are such | |
11751 | -- subtypes not needed, but they cannot always be generated, because | |
11752 | -- of order of elaboration issues. | |
996ae0b0 RK |
11753 | |
11754 | elsif Is_Record_Type (T) | |
11755 | and then Ekind (Formal) = E_In_Parameter | |
11756 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 11757 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
11758 | and then not Is_Discrim_SO_Function (Subp) |
11759 | then | |
11760 | AS_Needed := True; | |
11761 | ||
11762 | -- All other cases do not need an actual subtype | |
11763 | ||
11764 | else | |
11765 | AS_Needed := False; | |
11766 | end if; | |
11767 | ||
11768 | -- Generate actual subtypes for unconstrained arrays and | |
11769 | -- unconstrained discriminated records. | |
11770 | ||
11771 | if AS_Needed then | |
7324bf49 | 11772 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 11773 | |
57a8057a | 11774 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
11775 | -- variable that renames the corresponding entry of the |
11776 | -- parameter block, and it is this local variable that may | |
da94696d | 11777 | -- require an actual subtype. |
fbf5a39b | 11778 | |
4460a9bc | 11779 | if Expander_Active then |
fbf5a39b AC |
11780 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
11781 | else | |
11782 | Decl := Build_Actual_Subtype (T, Formal); | |
11783 | end if; | |
11784 | ||
996ae0b0 RK |
11785 | if Present (Handled_Statement_Sequence (N)) then |
11786 | First_Stmt := | |
11787 | First (Statements (Handled_Statement_Sequence (N))); | |
11788 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
11789 | Mark_Rewrite_Insertion (Decl); | |
11790 | else | |
82c80734 RD |
11791 | -- If the accept statement has no body, there will be no |
11792 | -- reference to the actuals, so no need to compute actual | |
11793 | -- subtypes. | |
996ae0b0 RK |
11794 | |
11795 | return; | |
11796 | end if; | |
11797 | ||
11798 | else | |
fbf5a39b | 11799 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
11800 | Prepend (Decl, Declarations (N)); |
11801 | Mark_Rewrite_Insertion (Decl); | |
11802 | end if; | |
11803 | ||
82c80734 RD |
11804 | -- The declaration uses the bounds of an existing object, and |
11805 | -- therefore needs no constraint checks. | |
2820d220 | 11806 | |
7324bf49 | 11807 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 11808 | |
996ae0b0 RK |
11809 | -- We need to freeze manually the generated type when it is |
11810 | -- inserted anywhere else than in a declarative part. | |
11811 | ||
11812 | if Present (First_Stmt) then | |
11813 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 11814 | Freeze_Entity (Defining_Identifier (Decl), N)); |
fcadacf7 ES |
11815 | |
11816 | -- Ditto if the type has a dynamic predicate, because the | |
11817 | -- generated function will mention the actual subtype. | |
11818 | ||
11819 | elsif Has_Dynamic_Predicate_Aspect (T) then | |
11820 | Insert_List_Before_And_Analyze (Decl, | |
11821 | Freeze_Entity (Defining_Identifier (Decl), N)); | |
996ae0b0 RK |
11822 | end if; |
11823 | ||
fbf5a39b | 11824 | if Nkind (N) = N_Accept_Statement |
4460a9bc | 11825 | and then Expander_Active |
fbf5a39b AC |
11826 | then |
11827 | Set_Actual_Subtype (Renamed_Object (Formal), | |
11828 | Defining_Identifier (Decl)); | |
11829 | else | |
11830 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
11831 | end if; | |
996ae0b0 RK |
11832 | end if; |
11833 | ||
11834 | Next_Formal (Formal); | |
11835 | end loop; | |
11836 | end Set_Actual_Subtypes; | |
11837 | ||
11838 | --------------------- | |
11839 | -- Set_Formal_Mode -- | |
11840 | --------------------- | |
11841 | ||
11842 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
11843 | Spec : constant Node_Id := Parent (Formal_Id); | |
11844 | ||
11845 | begin | |
11846 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
11847 | -- since we ensure that corresponding actuals are always valid at the | |
11848 | -- point of the call. | |
11849 | ||
11850 | if Out_Present (Spec) then | |
fc999c5d RD |
11851 | if Ekind_In (Scope (Formal_Id), E_Function, E_Generic_Function) then |
11852 | ||
b4ca2d2c | 11853 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
11854 | |
11855 | if Ada_Version >= Ada_2012 then | |
e6425869 AC |
11856 | |
11857 | -- Even in Ada 2012 operators can only have IN parameters | |
11858 | ||
11859 | if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then | |
11860 | Error_Msg_N ("operators can only have IN parameters", Spec); | |
11861 | end if; | |
11862 | ||
c56a9ba4 AC |
11863 | if In_Present (Spec) then |
11864 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
11865 | else | |
11866 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
11867 | end if; | |
11868 | ||
fc999c5d RD |
11869 | Set_Has_Out_Or_In_Out_Parameter (Scope (Formal_Id), True); |
11870 | ||
b4ca2d2c AC |
11871 | -- But not in earlier versions of Ada |
11872 | ||
c56a9ba4 AC |
11873 | else |
11874 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
11875 | Set_Ekind (Formal_Id, E_In_Parameter); | |
11876 | end if; | |
996ae0b0 RK |
11877 | |
11878 | elsif In_Present (Spec) then | |
11879 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
11880 | ||
11881 | else | |
fbf5a39b AC |
11882 | Set_Ekind (Formal_Id, E_Out_Parameter); |
11883 | Set_Never_Set_In_Source (Formal_Id, True); | |
11884 | Set_Is_True_Constant (Formal_Id, False); | |
11885 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
11886 | end if; |
11887 | ||
11888 | else | |
11889 | Set_Ekind (Formal_Id, E_In_Parameter); | |
11890 | end if; | |
11891 | ||
fbf5a39b | 11892 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
11893 | -- guarantees that access parameters are always non-null. We also set |
11894 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
11895 | |
11896 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 11897 | |
885c4871 | 11898 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 11899 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 11900 | |
0791fbe9 | 11901 | if Ada_Version < Ada_2005 |
2813bb6b | 11902 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
11903 | then |
11904 | Set_Is_Known_Non_Null (Formal_Id); | |
11905 | Set_Can_Never_Be_Null (Formal_Id); | |
11906 | end if; | |
2813bb6b | 11907 | |
41251c60 JM |
11908 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
11909 | ||
2813bb6b ES |
11910 | elsif Is_Access_Type (Etype (Formal_Id)) |
11911 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
11912 | then | |
2813bb6b | 11913 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
11914 | |
11915 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
11916 | -- access checks) for the case of an IN parameter, which cannot | |
11917 | -- be changed, or for an IN OUT parameter, which can be changed but | |
11918 | -- not to a null value. But for an OUT parameter, the initial value | |
11919 | -- passed in can be null, so we can't set this flag in that case. | |
11920 | ||
11921 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
11922 | Set_Can_Never_Be_Null (Formal_Id); | |
11923 | end if; | |
fbf5a39b AC |
11924 | end if; |
11925 | ||
996ae0b0 RK |
11926 | Set_Mechanism (Formal_Id, Default_Mechanism); |
11927 | Set_Formal_Validity (Formal_Id); | |
11928 | end Set_Formal_Mode; | |
11929 | ||
11930 | ------------------------- | |
11931 | -- Set_Formal_Validity -- | |
11932 | ------------------------- | |
11933 | ||
11934 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
11935 | begin | |
82c80734 RD |
11936 | -- If no validity checking, then we cannot assume anything about the |
11937 | -- validity of parameters, since we do not know there is any checking | |
11938 | -- of the validity on the call side. | |
996ae0b0 RK |
11939 | |
11940 | if not Validity_Checks_On then | |
11941 | return; | |
11942 | ||
fbf5a39b AC |
11943 | -- If validity checking for parameters is enabled, this means we are |
11944 | -- not supposed to make any assumptions about argument values. | |
11945 | ||
11946 | elsif Validity_Check_Parameters then | |
11947 | return; | |
11948 | ||
11949 | -- If we are checking in parameters, we will assume that the caller is | |
11950 | -- also checking parameters, so we can assume the parameter is valid. | |
11951 | ||
996ae0b0 RK |
11952 | elsif Ekind (Formal_Id) = E_In_Parameter |
11953 | and then Validity_Check_In_Params | |
11954 | then | |
11955 | Set_Is_Known_Valid (Formal_Id, True); | |
11956 | ||
fbf5a39b AC |
11957 | -- Similar treatment for IN OUT parameters |
11958 | ||
996ae0b0 RK |
11959 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
11960 | and then Validity_Check_In_Out_Params | |
11961 | then | |
11962 | Set_Is_Known_Valid (Formal_Id, True); | |
11963 | end if; | |
11964 | end Set_Formal_Validity; | |
11965 | ||
11966 | ------------------------ | |
11967 | -- Subtype_Conformant -- | |
11968 | ------------------------ | |
11969 | ||
ce2b6ba5 JM |
11970 | function Subtype_Conformant |
11971 | (New_Id : Entity_Id; | |
11972 | Old_Id : Entity_Id; | |
11973 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
11974 | is | |
996ae0b0 | 11975 | Result : Boolean; |
996ae0b0 | 11976 | begin |
ce2b6ba5 JM |
11977 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
11978 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
11979 | return Result; |
11980 | end Subtype_Conformant; | |
11981 | ||
11982 | --------------------- | |
11983 | -- Type_Conformant -- | |
11984 | --------------------- | |
11985 | ||
41251c60 JM |
11986 | function Type_Conformant |
11987 | (New_Id : Entity_Id; | |
11988 | Old_Id : Entity_Id; | |
11989 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
11990 | is | |
996ae0b0 | 11991 | Result : Boolean; |
996ae0b0 | 11992 | begin |
c8ef728f ES |
11993 | May_Hide_Profile := False; |
11994 | ||
41251c60 JM |
11995 | Check_Conformance |
11996 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
11997 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
11998 | return Result; |
11999 | end Type_Conformant; | |
12000 | ||
12001 | ------------------------------- | |
12002 | -- Valid_Operator_Definition -- | |
12003 | ------------------------------- | |
12004 | ||
12005 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
12006 | N : Integer := 0; | |
12007 | F : Entity_Id; | |
12008 | Id : constant Name_Id := Chars (Designator); | |
12009 | N_OK : Boolean; | |
12010 | ||
12011 | begin | |
12012 | F := First_Formal (Designator); | |
996ae0b0 RK |
12013 | while Present (F) loop |
12014 | N := N + 1; | |
12015 | ||
12016 | if Present (Default_Value (F)) then | |
ed2233dc | 12017 | Error_Msg_N |
996ae0b0 RK |
12018 | ("default values not allowed for operator parameters", |
12019 | Parent (F)); | |
220d1fd9 AC |
12020 | |
12021 | -- For function instantiations that are operators, we must check | |
12022 | -- separately that the corresponding generic only has in-parameters. | |
12023 | -- For subprogram declarations this is done in Set_Formal_Mode. | |
12024 | -- Such an error could not arise in earlier versions of the language. | |
12025 | ||
12026 | elsif Ekind (F) /= E_In_Parameter then | |
12027 | Error_Msg_N | |
12028 | ("operators can only have IN parameters", F); | |
996ae0b0 RK |
12029 | end if; |
12030 | ||
12031 | Next_Formal (F); | |
12032 | end loop; | |
12033 | ||
12034 | -- Verify that user-defined operators have proper number of arguments | |
12035 | -- First case of operators which can only be unary | |
12036 | ||
b69cd36a | 12037 | if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
996ae0b0 RK |
12038 | N_OK := (N = 1); |
12039 | ||
12040 | -- Case of operators which can be unary or binary | |
12041 | ||
b69cd36a | 12042 | elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
12043 | N_OK := (N in 1 .. 2); |
12044 | ||
12045 | -- All other operators can only be binary | |
12046 | ||
12047 | else | |
12048 | N_OK := (N = 2); | |
12049 | end if; | |
12050 | ||
12051 | if not N_OK then | |
12052 | Error_Msg_N | |
12053 | ("incorrect number of arguments for operator", Designator); | |
12054 | end if; | |
12055 | ||
12056 | if Id = Name_Op_Ne | |
12057 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
12058 | and then not Is_Intrinsic_Subprogram (Designator) | |
12059 | then | |
12060 | Error_Msg_N | |
12061 | ("explicit definition of inequality not allowed", Designator); | |
12062 | end if; | |
12063 | end Valid_Operator_Definition; | |
12064 | ||
12065 | end Sem_Ch6; |