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996ae0b0 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M _ C H 6 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
996ae0b0 | 8 | -- -- |
c7b9d548 | 9 | -- Copyright (C) 1992-2011, Free Software Foundation, Inc. -- |
996ae0b0 RK |
10 | -- -- |
11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
996ae0b0 RK |
14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
17 | -- for more details. You should have received a copy of the GNU General -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
996ae0b0 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
996ae0b0 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
26 | with Atree; use Atree; | |
27 | with Checks; use Checks; | |
28 | with Debug; use Debug; | |
29 | with Einfo; use Einfo; | |
30 | with Elists; use Elists; | |
31 | with Errout; use Errout; | |
32 | with Expander; use Expander; | |
ec4867fa | 33 | with Exp_Ch6; use Exp_Ch6; |
996ae0b0 | 34 | with Exp_Ch7; use Exp_Ch7; |
21d27997 | 35 | with Exp_Ch9; use Exp_Ch9; |
ce2b6ba5 | 36 | with Exp_Disp; use Exp_Disp; |
e660dbf7 | 37 | with Exp_Tss; use Exp_Tss; |
ec4867fa | 38 | with Exp_Util; use Exp_Util; |
fbf5a39b | 39 | with Fname; use Fname; |
996ae0b0 | 40 | with Freeze; use Freeze; |
41251c60 | 41 | with Itypes; use Itypes; |
996ae0b0 | 42 | with Lib.Xref; use Lib.Xref; |
ec4867fa | 43 | with Layout; use Layout; |
996ae0b0 RK |
44 | with Namet; use Namet; |
45 | with Lib; use Lib; | |
46 | with Nlists; use Nlists; | |
47 | with Nmake; use Nmake; | |
48 | with Opt; use Opt; | |
49 | with Output; use Output; | |
b20de9b9 AC |
50 | with Restrict; use Restrict; |
51 | with Rident; use Rident; | |
996ae0b0 RK |
52 | with Rtsfind; use Rtsfind; |
53 | with Sem; use Sem; | |
a4100e55 | 54 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
55 | with Sem_Cat; use Sem_Cat; |
56 | with Sem_Ch3; use Sem_Ch3; | |
57 | with Sem_Ch4; use Sem_Ch4; | |
58 | with Sem_Ch5; use Sem_Ch5; | |
59 | with Sem_Ch8; use Sem_Ch8; | |
9bc856dd | 60 | with Sem_Ch10; use Sem_Ch10; |
996ae0b0 | 61 | with Sem_Ch12; use Sem_Ch12; |
0f1a6a0b | 62 | with Sem_Ch13; use Sem_Ch13; |
dec6faf1 | 63 | with Sem_Dim; use Sem_Dim; |
996ae0b0 RK |
64 | with Sem_Disp; use Sem_Disp; |
65 | with Sem_Dist; use Sem_Dist; | |
66 | with Sem_Elim; use Sem_Elim; | |
67 | with Sem_Eval; use Sem_Eval; | |
68 | with Sem_Mech; use Sem_Mech; | |
69 | with Sem_Prag; use Sem_Prag; | |
70 | with Sem_Res; use Sem_Res; | |
71 | with Sem_Util; use Sem_Util; | |
72 | with Sem_Type; use Sem_Type; | |
73 | with Sem_Warn; use Sem_Warn; | |
74 | with Sinput; use Sinput; | |
75 | with Stand; use Stand; | |
76 | with Sinfo; use Sinfo; | |
77 | with Sinfo.CN; use Sinfo.CN; | |
78 | with Snames; use Snames; | |
79 | with Stringt; use Stringt; | |
80 | with Style; | |
81 | with Stylesw; use Stylesw; | |
8417f4b2 | 82 | with Targparm; use Targparm; |
996ae0b0 RK |
83 | with Tbuild; use Tbuild; |
84 | with Uintp; use Uintp; | |
85 | with Urealp; use Urealp; | |
86 | with Validsw; use Validsw; | |
87 | ||
88 | package body Sem_Ch6 is | |
89 | ||
c8ef728f | 90 | May_Hide_Profile : Boolean := False; |
ec4867fa ES |
91 | -- This flag is used to indicate that two formals in two subprograms being |
92 | -- checked for conformance differ only in that one is an access parameter | |
93 | -- while the other is of a general access type with the same designated | |
94 | -- type. In this case, if the rest of the signatures match, a call to | |
95 | -- either subprogram may be ambiguous, which is worth a warning. The flag | |
96 | -- is set in Compatible_Types, and the warning emitted in | |
97 | -- New_Overloaded_Entity. | |
c8ef728f | 98 | |
996ae0b0 RK |
99 | ----------------------- |
100 | -- Local Subprograms -- | |
101 | ----------------------- | |
102 | ||
5d37ba92 | 103 | procedure Analyze_Return_Statement (N : Node_Id); |
5b9c3fc4 | 104 | -- Common processing for simple and extended return statements |
ec4867fa ES |
105 | |
106 | procedure Analyze_Function_Return (N : Node_Id); | |
81db9d77 ES |
107 | -- Subsidiary to Analyze_Return_Statement. Called when the return statement |
108 | -- applies to a [generic] function. | |
ec4867fa | 109 | |
82c80734 RD |
110 | procedure Analyze_Return_Type (N : Node_Id); |
111 | -- Subsidiary to Process_Formals: analyze subtype mark in function | |
5b9c3fc4 | 112 | -- specification in a context where the formals are visible and hide |
82c80734 RD |
113 | -- outer homographs. |
114 | ||
b1b543d2 | 115 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
13d923cc RD |
116 | -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
117 | -- that we can use RETURN but not skip the debug output at the end. | |
b1b543d2 | 118 | |
996ae0b0 | 119 | procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); |
82c80734 RD |
120 | -- Analyze a generic subprogram body. N is the body to be analyzed, and |
121 | -- Gen_Id is the defining entity Id for the corresponding spec. | |
996ae0b0 | 122 | |
d05ef0ab | 123 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id); |
996ae0b0 RK |
124 | -- If a subprogram has pragma Inline and inlining is active, use generic |
125 | -- machinery to build an unexpanded body for the subprogram. This body is | |
f3d57416 | 126 | -- subsequently used for inline expansions at call sites. If subprogram can |
996ae0b0 RK |
127 | -- be inlined (depending on size and nature of local declarations) this |
128 | -- function returns true. Otherwise subprogram body is treated normally. | |
aa720a54 AC |
129 | -- If proper warnings are enabled and the subprogram contains a construct |
130 | -- that cannot be inlined, the offending construct is flagged accordingly. | |
996ae0b0 | 131 | |
806f6d37 AC |
132 | function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
133 | -- Returns true if Subp can override a predefined operator. | |
134 | ||
996ae0b0 | 135 | procedure Check_Conformance |
41251c60 JM |
136 | (New_Id : Entity_Id; |
137 | Old_Id : Entity_Id; | |
138 | Ctype : Conformance_Type; | |
139 | Errmsg : Boolean; | |
140 | Conforms : out Boolean; | |
141 | Err_Loc : Node_Id := Empty; | |
142 | Get_Inst : Boolean := False; | |
143 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
144 | -- Given two entities, this procedure checks that the profiles associated |
145 | -- with these entities meet the conformance criterion given by the third | |
146 | -- parameter. If they conform, Conforms is set True and control returns | |
147 | -- to the caller. If they do not conform, Conforms is set to False, and | |
148 | -- in addition, if Errmsg is True on the call, proper messages are output | |
149 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
150 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
151 | -- error messages are placed on the appropriate part of the construct | |
152 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
153 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
154 | -- be called. | |
155 | ||
156 | procedure Check_Subprogram_Order (N : Node_Id); | |
157 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
158 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
159 | ||
996ae0b0 RK |
160 | procedure Check_Returns |
161 | (HSS : Node_Id; | |
162 | Mode : Character; | |
c8ef728f ES |
163 | Err : out Boolean; |
164 | Proc : Entity_Id := Empty); | |
165 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 166 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
167 | -- handled statement sequence for the subprogram body. This procedure |
168 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
169 | -- used for functions) or do not have a return (Mode = 'P', used for | |
170 | -- No_Return procedures). The flag Err is set if there are any control | |
171 | -- paths not explicitly terminated by a return in the function case, and is | |
172 | -- True otherwise. Proc is the entity for the procedure case and is used | |
173 | -- in posting the warning message. | |
996ae0b0 | 174 | |
e5a58fac AC |
175 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
176 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
177 | -- must appear before the type is frozen, and have the same visibility as | |
178 | -- that of the type. This procedure checks that this rule is met, and | |
179 | -- otherwise emits an error on the subprogram declaration and a warning | |
180 | -- on the earlier freeze point if it is easy to locate. | |
181 | ||
996ae0b0 | 182 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
183 | -- This procedure makes S, a new overloaded entity, into the first visible |
184 | -- entity with that name. | |
996ae0b0 | 185 | |
a5b62485 AC |
186 | function Is_Non_Overriding_Operation |
187 | (Prev_E : Entity_Id; | |
188 | New_E : Entity_Id) return Boolean; | |
189 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
190 | -- overrides an inherited operation only if the corresponding operation | |
191 | -- was overriding in the generic. This can happen for primitive operations | |
192 | -- of types derived (in the generic unit) from formal private or formal | |
193 | -- derived types. | |
194 | ||
996ae0b0 RK |
195 | procedure Make_Inequality_Operator (S : Entity_Id); |
196 | -- Create the declaration for an inequality operator that is implicitly | |
197 | -- created by a user-defined equality operator that yields a boolean. | |
198 | ||
199 | procedure May_Need_Actuals (Fun : Entity_Id); | |
200 | -- Flag functions that can be called without parameters, i.e. those that | |
201 | -- have no parameters, or those for which defaults exist for all parameters | |
202 | ||
21d27997 RD |
203 | procedure Process_PPCs |
204 | (N : Node_Id; | |
205 | Spec_Id : Entity_Id; | |
206 | Body_Id : Entity_Id); | |
3764bb00 BD |
207 | -- Called from Analyze[_Generic]_Subprogram_Body to deal with scanning post |
208 | -- conditions for the body and assembling and inserting the _postconditions | |
209 | -- procedure. N is the node for the subprogram body and Body_Id/Spec_Id are | |
210 | -- the entities for the body and separate spec (if there is no separate | |
b4ca2d2c AC |
211 | -- spec, Spec_Id is Empty). Note that invariants and predicates may also |
212 | -- provide postconditions, and are also handled in this procedure. | |
21d27997 | 213 | |
996ae0b0 RK |
214 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
215 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
216 | -- setting the proper validity status for this entity, which depends on |
217 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
218 | |
219 | --------------------------------------------- | |
220 | -- Analyze_Abstract_Subprogram_Declaration -- | |
221 | --------------------------------------------- | |
222 | ||
223 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
fbf5a39b AC |
224 | Designator : constant Entity_Id := |
225 | Analyze_Subprogram_Specification (Specification (N)); | |
996ae0b0 RK |
226 | Scop : constant Entity_Id := Current_Scope; |
227 | ||
228 | begin | |
2ba431e5 | 229 | Check_SPARK_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 230 | |
996ae0b0 | 231 | Generate_Definition (Designator); |
dac3bede | 232 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
f937473f | 233 | Set_Is_Abstract_Subprogram (Designator); |
996ae0b0 RK |
234 | New_Overloaded_Entity (Designator); |
235 | Check_Delayed_Subprogram (Designator); | |
236 | ||
fbf5a39b | 237 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 RK |
238 | |
239 | if Ekind (Scope (Designator)) = E_Protected_Type then | |
240 | Error_Msg_N | |
241 | ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
242 | |
243 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
244 | -- operation nor an operation that overrides an inherited subprogram or | |
245 | -- predefined operator, since this most likely indicates a mistake. | |
246 | ||
247 | elsif Warn_On_Redundant_Constructs | |
248 | and then not Is_Dispatching_Operation (Designator) | |
038140ed | 249 | and then not Present (Overridden_Operation (Designator)) |
5d37ba92 ES |
250 | and then (not Is_Operator_Symbol_Name (Chars (Designator)) |
251 | or else Scop /= Scope (Etype (First_Formal (Designator)))) | |
252 | then | |
253 | Error_Msg_N | |
254 | ("?abstract subprogram is not dispatching or overriding", N); | |
996ae0b0 | 255 | end if; |
fbf5a39b AC |
256 | |
257 | Generate_Reference_To_Formals (Designator); | |
361effb1 | 258 | Check_Eliminated (Designator); |
eaba57fb RD |
259 | |
260 | if Has_Aspects (N) then | |
261 | Analyze_Aspect_Specifications (N, Designator); | |
262 | end if; | |
996ae0b0 RK |
263 | end Analyze_Abstract_Subprogram_Declaration; |
264 | ||
b0186f71 AC |
265 | --------------------------------- |
266 | -- Analyze_Expression_Function -- | |
267 | --------------------------------- | |
268 | ||
269 | procedure Analyze_Expression_Function (N : Node_Id) is | |
270 | Loc : constant Source_Ptr := Sloc (N); | |
271 | LocX : constant Source_Ptr := Sloc (Expression (N)); | |
0b5b2bbc | 272 | Expr : constant Node_Id := Expression (N); |
d2d4b355 AC |
273 | Spec : constant Node_Id := Specification (N); |
274 | ||
8a06151a | 275 | Def_Id : Entity_Id; |
d2d4b355 | 276 | pragma Unreferenced (Def_Id); |
b0186f71 | 277 | |
8a06151a | 278 | Prev : Entity_Id; |
b0186f71 | 279 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
280 | -- declaration is completed. Def_Id is needed to analyze the spec. |
281 | ||
282 | New_Body : Node_Id; | |
283 | New_Decl : Node_Id; | |
284 | New_Spec : Node_Id; | |
b913199e | 285 | Ret : Node_Id; |
b0186f71 AC |
286 | |
287 | begin | |
288 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 289 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
290 | -- function into an equivalent subprogram body, and analyze it. |
291 | ||
292 | -- Expression functions are inlined unconditionally. The back-end will | |
293 | -- determine whether this is possible. | |
294 | ||
295 | Inline_Processing_Required := True; | |
d2d4b355 AC |
296 | New_Spec := Copy_Separate_Tree (Spec); |
297 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); | |
298 | ||
299 | -- If there are previous overloadable entities with the same name, | |
300 | -- check whether any of them is completed by the expression function. | |
301 | ||
8a06151a | 302 | if Present (Prev) and then Is_Overloadable (Prev) then |
d2d4b355 AC |
303 | Def_Id := Analyze_Subprogram_Specification (Spec); |
304 | Prev := Find_Corresponding_Spec (N); | |
305 | end if; | |
b0186f71 | 306 | |
b913199e AC |
307 | Ret := Make_Simple_Return_Statement (LocX, Expression (N)); |
308 | ||
b0186f71 AC |
309 | New_Body := |
310 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 311 | Specification => New_Spec, |
b0186f71 AC |
312 | Declarations => Empty_List, |
313 | Handled_Statement_Sequence => | |
314 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 315 | Statements => New_List (Ret))); |
b0186f71 | 316 | |
6d7e5c54 AC |
317 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
318 | ||
b0186f71 AC |
319 | -- If the expression completes a generic subprogram, we must create a |
320 | -- separate node for the body, because at instantiation the original | |
321 | -- node of the generic copy must be a generic subprogram body, and | |
322 | -- cannot be a expression function. Otherwise we just rewrite the | |
323 | -- expression with the non-generic body. | |
324 | ||
325 | Insert_After (N, New_Body); | |
326 | Rewrite (N, Make_Null_Statement (Loc)); | |
d2d4b355 | 327 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
328 | Analyze (N); |
329 | Analyze (New_Body); | |
d2b10647 | 330 | Set_Is_Inlined (Prev); |
b0186f71 | 331 | |
6d7e5c54 AC |
332 | elsif Present (Prev) |
333 | and then Comes_From_Source (Prev) | |
334 | then | |
d2d4b355 | 335 | Set_Has_Completion (Prev, False); |
76264f60 AC |
336 | |
337 | -- For navigation purposes, indicate that the function is a body | |
338 | ||
339 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 340 | Rewrite (N, New_Body); |
d2b10647 ES |
341 | Analyze (N); |
342 | ||
6d7e5c54 AC |
343 | -- Prev is the previous entity with the same name, but it is can |
344 | -- be an unrelated spec that is not completed by the expression | |
345 | -- function. In that case the relevant entity is the one in the body. | |
346 | -- Not clear that the backend can inline it in this case ??? | |
347 | ||
348 | if Has_Completion (Prev) then | |
349 | Set_Is_Inlined (Prev); | |
350 | else | |
351 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
352 | end if; | |
353 | ||
0b5b2bbc | 354 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 355 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
356 | |
357 | else | |
358 | New_Decl := | |
d2d4b355 | 359 | Make_Subprogram_Declaration (Loc, Specification => Spec); |
804ff4c3 | 360 | |
d2b10647 | 361 | Rewrite (N, New_Decl); |
b0186f71 | 362 | Analyze (N); |
d2b10647 ES |
363 | Set_Is_Inlined (Defining_Entity (New_Decl)); |
364 | ||
6d7e5c54 AC |
365 | -- To prevent premature freeze action, insert the new body at the end |
366 | -- of the current declarations, or at the end of the package spec. | |
b913199e AC |
367 | -- However, resolve usage names now, to prevent spurious visibility |
368 | -- on later entities. | |
6d7e5c54 AC |
369 | |
370 | declare | |
e876c43a AC |
371 | Decls : List_Id := List_Containing (N); |
372 | Par : constant Node_Id := Parent (Decls); | |
b913199e | 373 | Id : constant Entity_Id := Defining_Entity (New_Decl); |
6d7e5c54 AC |
374 | |
375 | begin | |
376 | if Nkind (Par) = N_Package_Specification | |
377 | and then Decls = Visible_Declarations (Par) | |
378 | and then Present (Private_Declarations (Par)) | |
379 | and then not Is_Empty_List (Private_Declarations (Par)) | |
380 | then | |
381 | Decls := Private_Declarations (Par); | |
382 | end if; | |
383 | ||
384 | Insert_After (Last (Decls), New_Body); | |
b913199e AC |
385 | Push_Scope (Id); |
386 | Install_Formals (Id); | |
387 | Preanalyze_Spec_Expression (Expression (Ret), Etype (Id)); | |
388 | End_Scope; | |
6d7e5c54 | 389 | end; |
b0186f71 | 390 | end if; |
0b5b2bbc AC |
391 | |
392 | -- If the return expression is a static constant, we suppress warning | |
393 | -- messages on unused formals, which in most cases will be noise. | |
394 | ||
395 | Set_Is_Trivial_Subprogram (Defining_Entity (New_Body), | |
396 | Is_OK_Static_Expression (Expr)); | |
b0186f71 AC |
397 | end Analyze_Expression_Function; |
398 | ||
ec4867fa ES |
399 | ---------------------------------------- |
400 | -- Analyze_Extended_Return_Statement -- | |
401 | ---------------------------------------- | |
402 | ||
403 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
404 | begin | |
5d37ba92 | 405 | Analyze_Return_Statement (N); |
ec4867fa ES |
406 | end Analyze_Extended_Return_Statement; |
407 | ||
996ae0b0 RK |
408 | ---------------------------- |
409 | -- Analyze_Function_Call -- | |
410 | ---------------------------- | |
411 | ||
412 | procedure Analyze_Function_Call (N : Node_Id) is | |
e24329cd YM |
413 | P : constant Node_Id := Name (N); |
414 | Actuals : constant List_Id := Parameter_Associations (N); | |
415 | Actual : Node_Id; | |
996ae0b0 RK |
416 | |
417 | begin | |
418 | Analyze (P); | |
419 | ||
3e7302c3 AC |
420 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
421 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
422 | -- has been analyzed and we just return. | |
82c80734 RD |
423 | |
424 | if Nkind (P) = N_Selected_Component | |
425 | and then Name (N) /= P | |
426 | and then Is_Rewrite_Substitution (N) | |
427 | and then Present (Etype (N)) | |
428 | then | |
429 | return; | |
430 | end if; | |
431 | ||
996ae0b0 RK |
432 | -- If error analyzing name, then set Any_Type as result type and return |
433 | ||
434 | if Etype (P) = Any_Type then | |
435 | Set_Etype (N, Any_Type); | |
436 | return; | |
437 | end if; | |
438 | ||
439 | -- Otherwise analyze the parameters | |
440 | ||
e24329cd YM |
441 | if Present (Actuals) then |
442 | Actual := First (Actuals); | |
996ae0b0 RK |
443 | while Present (Actual) loop |
444 | Analyze (Actual); | |
445 | Check_Parameterless_Call (Actual); | |
446 | Next (Actual); | |
447 | end loop; | |
448 | end if; | |
449 | ||
450 | Analyze_Call (N); | |
996ae0b0 RK |
451 | end Analyze_Function_Call; |
452 | ||
ec4867fa ES |
453 | ----------------------------- |
454 | -- Analyze_Function_Return -- | |
455 | ----------------------------- | |
456 | ||
457 | procedure Analyze_Function_Return (N : Node_Id) is | |
458 | Loc : constant Source_Ptr := Sloc (N); | |
459 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
460 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
461 | ||
5d37ba92 | 462 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
463 | -- Function result subtype |
464 | ||
465 | procedure Check_Limited_Return (Expr : Node_Id); | |
466 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
467 | -- limited types. Used only for simple return statements. | |
468 | -- Expr is the expression returned. | |
469 | ||
470 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
471 | -- Check that the return_subtype_indication properly matches the result | |
472 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
473 | ||
474 | -------------------------- | |
475 | -- Check_Limited_Return -- | |
476 | -------------------------- | |
477 | ||
478 | procedure Check_Limited_Return (Expr : Node_Id) is | |
479 | begin | |
480 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
481 | -- removed and replaced by anonymous access results. This is an | |
482 | -- incompatibility with Ada 95. Not clear whether this should be | |
483 | -- enforced yet or perhaps controllable with special switch. ??? | |
484 | ||
ce72a9a3 AC |
485 | -- A limited interface that is not immutably limited is OK. |
486 | ||
487 | if Is_Limited_Interface (R_Type) | |
488 | and then | |
489 | not (Is_Task_Interface (R_Type) | |
490 | or else Is_Protected_Interface (R_Type) | |
491 | or else Is_Synchronized_Interface (R_Type)) | |
492 | then | |
493 | null; | |
494 | ||
495 | elsif Is_Limited_Type (R_Type) | |
496 | and then not Is_Interface (R_Type) | |
ec4867fa ES |
497 | and then Comes_From_Source (N) |
498 | and then not In_Instance_Body | |
2a31c32b | 499 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
500 | then |
501 | -- Error in Ada 2005 | |
502 | ||
0791fbe9 | 503 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
504 | and then not Debug_Flag_Dot_L |
505 | and then not GNAT_Mode | |
506 | then | |
507 | Error_Msg_N | |
508 | ("(Ada 2005) cannot copy object of a limited type " & | |
5d37ba92 | 509 | "(RM-2005 6.5(5.5/2))", Expr); |
e0ae93e2 | 510 | |
40f07b4b | 511 | if Is_Immutably_Limited_Type (R_Type) then |
ec4867fa ES |
512 | Error_Msg_N |
513 | ("\return by reference not permitted in Ada 2005", Expr); | |
514 | end if; | |
515 | ||
516 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
517 | -- incompatibility. | |
518 | ||
519 | -- In GNAT mode, this is just a warning, to allow it to be | |
520 | -- evilly turned off. Otherwise it is a real error. | |
521 | ||
9694c039 AC |
522 | -- In a generic context, simplify the warning because it makes |
523 | -- no sense to discuss pass-by-reference or copy. | |
524 | ||
ec4867fa | 525 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
526 | if Inside_A_Generic then |
527 | Error_Msg_N | |
885c4871 | 528 | ("return of limited object not permitted in Ada 2005 " |
20261dc1 | 529 | & "(RM-2005 6.5(5.5/2))?", Expr); |
9694c039 AC |
530 | |
531 | elsif Is_Immutably_Limited_Type (R_Type) then | |
ec4867fa | 532 | Error_Msg_N |
20261dc1 AC |
533 | ("return by reference not permitted in Ada 2005 " |
534 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
ec4867fa ES |
535 | else |
536 | Error_Msg_N | |
20261dc1 AC |
537 | ("cannot copy object of a limited type in Ada 2005 " |
538 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
ec4867fa ES |
539 | end if; |
540 | ||
541 | -- Ada 95 mode, compatibility warnings disabled | |
542 | ||
543 | else | |
544 | return; -- skip continuation messages below | |
545 | end if; | |
546 | ||
9694c039 AC |
547 | if not Inside_A_Generic then |
548 | Error_Msg_N | |
549 | ("\consider switching to return of access type", Expr); | |
550 | Explain_Limited_Type (R_Type, Expr); | |
551 | end if; | |
ec4867fa ES |
552 | end if; |
553 | end Check_Limited_Return; | |
554 | ||
555 | ------------------------------------- | |
556 | -- Check_Return_Subtype_Indication -- | |
557 | ------------------------------------- | |
558 | ||
559 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
560 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
561 | ||
562 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
563 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
564 | |
565 | Subtype_Ind : constant Node_Id := | |
566 | Object_Definition (Original_Node (Obj_Decl)); | |
567 | ||
568 | R_Type_Is_Anon_Access : | |
569 | constant Boolean := | |
570 | Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type | |
571 | or else | |
572 | Ekind (R_Type) = E_Anonymous_Access_Protected_Subprogram_Type | |
573 | or else | |
574 | Ekind (R_Type) = E_Anonymous_Access_Type; | |
575 | -- True if return type of the function is an anonymous access type | |
576 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
577 | ||
578 | R_Stm_Type_Is_Anon_Access : | |
579 | constant Boolean := | |
0a36105d | 580 | Ekind (R_Stm_Type) = E_Anonymous_Access_Subprogram_Type |
ec4867fa | 581 | or else |
0a36105d | 582 | Ekind (R_Stm_Type) = E_Anonymous_Access_Protected_Subprogram_Type |
ec4867fa | 583 | or else |
0a36105d | 584 | Ekind (R_Stm_Type) = E_Anonymous_Access_Type; |
ec4867fa ES |
585 | -- True if type of the return object is an anonymous access type |
586 | ||
587 | begin | |
7665e4bd | 588 | -- First, avoid cascaded errors |
ec4867fa ES |
589 | |
590 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
591 | return; | |
592 | end if; | |
593 | ||
594 | -- "return access T" case; check that the return statement also has | |
595 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 596 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
597 | |
598 | if R_Type_Is_Anon_Access then | |
599 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
600 | if |
601 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 602 | then |
53cf4600 ES |
603 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
604 | Base_Type (Designated_Type (R_Type)) | |
605 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
606 | then | |
607 | Error_Msg_N | |
608 | ("subtype must statically match function result subtype", | |
609 | Subtype_Mark (Subtype_Ind)); | |
610 | end if; | |
611 | ||
612 | else | |
613 | -- For two anonymous access to subprogram types, the | |
614 | -- types themselves must be type conformant. | |
615 | ||
616 | if not Conforming_Types | |
617 | (R_Stm_Type, R_Type, Fully_Conformant) | |
618 | then | |
619 | Error_Msg_N | |
620 | ("subtype must statically match function result subtype", | |
621 | Subtype_Ind); | |
622 | end if; | |
ec4867fa | 623 | end if; |
0a36105d | 624 | |
ec4867fa ES |
625 | else |
626 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
627 | end if; | |
628 | ||
6cce2156 GD |
629 | -- If the return object is of an anonymous access type, then report |
630 | -- an error if the function's result type is not also anonymous. | |
631 | ||
632 | elsif R_Stm_Type_Is_Anon_Access | |
633 | and then not R_Type_Is_Anon_Access | |
634 | then | |
635 | Error_Msg_N ("anonymous access not allowed for function with " & | |
636 | "named access result", Subtype_Ind); | |
637 | ||
81d93365 AC |
638 | -- Subtype indication case: check that the return object's type is |
639 | -- covered by the result type, and that the subtypes statically match | |
640 | -- when the result subtype is constrained. Also handle record types | |
641 | -- with unknown discriminants for which we have built the underlying | |
642 | -- record view. Coverage is needed to allow specific-type return | |
643 | -- objects when the result type is class-wide (see AI05-32). | |
644 | ||
645 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 646 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
647 | and then |
648 | Covers | |
649 | (Base_Type (R_Type), | |
650 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
651 | then |
652 | -- A null exclusion may be present on the return type, on the | |
653 | -- function specification, on the object declaration or on the | |
654 | -- subtype itself. | |
ec4867fa | 655 | |
21d27997 RD |
656 | if Is_Access_Type (R_Type) |
657 | and then | |
658 | (Can_Never_Be_Null (R_Type) | |
659 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
660 | Can_Never_Be_Null (R_Stm_Type) | |
661 | then | |
662 | Error_Msg_N | |
663 | ("subtype must statically match function result subtype", | |
664 | Subtype_Ind); | |
665 | end if; | |
666 | ||
105b5e65 | 667 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
668 | |
669 | if Is_Constrained (R_Type) | |
670 | or else Is_Access_Type (R_Type) | |
671 | then | |
ec4867fa ES |
672 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
673 | Error_Msg_N | |
0a36105d JM |
674 | ("subtype must statically match function result subtype", |
675 | Subtype_Ind); | |
ec4867fa ES |
676 | end if; |
677 | end if; | |
678 | ||
ff7139c3 AC |
679 | elsif Etype (Base_Type (R_Type)) = R_Stm_Type |
680 | and then Is_Null_Extension (Base_Type (R_Type)) | |
681 | then | |
682 | null; | |
683 | ||
ec4867fa ES |
684 | else |
685 | Error_Msg_N | |
686 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
687 | end if; | |
688 | end Check_Return_Subtype_Indication; | |
689 | ||
690 | --------------------- | |
691 | -- Local Variables -- | |
692 | --------------------- | |
693 | ||
694 | Expr : Node_Id; | |
695 | ||
696 | -- Start of processing for Analyze_Function_Return | |
697 | ||
698 | begin | |
699 | Set_Return_Present (Scope_Id); | |
700 | ||
5d37ba92 | 701 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 702 | Expr := Expression (N); |
4ee646da | 703 | |
e917aec2 RD |
704 | -- Guard against a malformed expression. The parser may have tried to |
705 | -- recover but the node is not analyzable. | |
4ee646da AC |
706 | |
707 | if Nkind (Expr) = N_Error then | |
708 | Set_Etype (Expr, Any_Type); | |
709 | Expander_Mode_Save_And_Set (False); | |
710 | return; | |
711 | ||
712 | else | |
0180fd26 AC |
713 | -- The resolution of a controlled [extension] aggregate associated |
714 | -- with a return statement creates a temporary which needs to be | |
715 | -- finalized on function exit. Wrap the return statement inside a | |
716 | -- block so that the finalization machinery can detect this case. | |
717 | -- This early expansion is done only when the return statement is | |
718 | -- not part of a handled sequence of statements. | |
719 | ||
720 | if Nkind_In (Expr, N_Aggregate, | |
721 | N_Extension_Aggregate) | |
722 | and then Needs_Finalization (R_Type) | |
723 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
724 | then | |
725 | Rewrite (N, | |
726 | Make_Block_Statement (Loc, | |
727 | Handled_Statement_Sequence => | |
728 | Make_Handled_Sequence_Of_Statements (Loc, | |
729 | Statements => New_List (Relocate_Node (N))))); | |
730 | ||
731 | Analyze (N); | |
732 | return; | |
733 | end if; | |
734 | ||
4ee646da AC |
735 | Analyze_And_Resolve (Expr, R_Type); |
736 | Check_Limited_Return (Expr); | |
737 | end if; | |
ec4867fa | 738 | |
ad05f2e9 | 739 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 740 | |
fe5d3068 | 741 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
742 | and then |
743 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 744 | or else Present (Next (N))) |
607d0635 | 745 | then |
2ba431e5 | 746 | Check_SPARK_Restriction |
fe5d3068 | 747 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
748 | end if; |
749 | ||
ec4867fa | 750 | else |
2ba431e5 | 751 | Check_SPARK_Restriction ("extended RETURN is not allowed", N); |
607d0635 | 752 | |
ec4867fa ES |
753 | -- Analyze parts specific to extended_return_statement: |
754 | ||
755 | declare | |
756 | Obj_Decl : constant Node_Id := | |
757 | Last (Return_Object_Declarations (N)); | |
758 | ||
759 | HSS : constant Node_Id := Handled_Statement_Sequence (N); | |
760 | ||
761 | begin | |
762 | Expr := Expression (Obj_Decl); | |
763 | ||
764 | -- Note: The check for OK_For_Limited_Init will happen in | |
765 | -- Analyze_Object_Declaration; we treat it as a normal | |
766 | -- object declaration. | |
767 | ||
cd1c668b | 768 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
769 | Analyze (Obj_Decl); |
770 | ||
ec4867fa ES |
771 | Check_Return_Subtype_Indication (Obj_Decl); |
772 | ||
773 | if Present (HSS) then | |
774 | Analyze (HSS); | |
775 | ||
776 | if Present (Exception_Handlers (HSS)) then | |
777 | ||
778 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
779 | -- Probably by creating an actual N_Block_Statement. | |
780 | -- Probably in Expand. | |
781 | ||
782 | null; | |
783 | end if; | |
784 | end if; | |
785 | ||
9337aa0a AC |
786 | -- Mark the return object as referenced, since the return is an |
787 | -- implicit reference of the object. | |
788 | ||
789 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
790 | ||
ec4867fa ES |
791 | Check_References (Stm_Entity); |
792 | end; | |
793 | end if; | |
794 | ||
21d27997 | 795 | -- Case of Expr present |
5d37ba92 | 796 | |
ec4867fa | 797 | if Present (Expr) |
21d27997 RD |
798 | |
799 | -- Defend against previous errors | |
800 | ||
801 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 802 | and then Present (Etype (Expr)) |
ec4867fa | 803 | then |
5d37ba92 ES |
804 | -- Apply constraint check. Note that this is done before the implicit |
805 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 806 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
807 | -- with null-excluding expressions found in return statements. |
808 | ||
809 | Apply_Constraint_Check (Expr, R_Type); | |
810 | ||
811 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
812 | -- type, apply an implicit conversion of the expression to that type | |
813 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 814 | |
0791fbe9 | 815 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
816 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
817 | then | |
818 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
819 | Analyze_And_Resolve (Expr, R_Type); | |
820 | end if; | |
821 | ||
21d27997 RD |
822 | -- If the result type is class-wide, then check that the return |
823 | -- expression's type is not declared at a deeper level than the | |
824 | -- function (RM05-6.5(5.6/2)). | |
825 | ||
0791fbe9 | 826 | if Ada_Version >= Ada_2005 |
21d27997 RD |
827 | and then Is_Class_Wide_Type (R_Type) |
828 | then | |
829 | if Type_Access_Level (Etype (Expr)) > | |
830 | Subprogram_Access_Level (Scope_Id) | |
831 | then | |
832 | Error_Msg_N | |
833 | ("level of return expression type is deeper than " & | |
834 | "class-wide function!", Expr); | |
835 | end if; | |
836 | end if; | |
837 | ||
4755cce9 JM |
838 | -- Check incorrect use of dynamically tagged expression |
839 | ||
840 | if Is_Tagged_Type (R_Type) then | |
841 | Check_Dynamically_Tagged_Expression | |
842 | (Expr => Expr, | |
843 | Typ => R_Type, | |
844 | Related_Nod => N); | |
ec4867fa ES |
845 | end if; |
846 | ||
ec4867fa ES |
847 | -- ??? A real run-time accessibility check is needed in cases |
848 | -- involving dereferences of access parameters. For now we just | |
849 | -- check the static cases. | |
850 | ||
0791fbe9 | 851 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
40f07b4b | 852 | and then Is_Immutably_Limited_Type (Etype (Scope_Id)) |
ec4867fa ES |
853 | and then Object_Access_Level (Expr) > |
854 | Subprogram_Access_Level (Scope_Id) | |
855 | then | |
ec4867fa | 856 | |
9694c039 AC |
857 | -- Suppress the message in a generic, where the rewriting |
858 | -- is irrelevant. | |
859 | ||
860 | if Inside_A_Generic then | |
861 | null; | |
862 | ||
863 | else | |
864 | Rewrite (N, | |
865 | Make_Raise_Program_Error (Loc, | |
866 | Reason => PE_Accessibility_Check_Failed)); | |
867 | Analyze (N); | |
868 | ||
869 | Error_Msg_N | |
870 | ("cannot return a local value by reference?", N); | |
871 | Error_Msg_NE | |
872 | ("\& will be raised at run time?", | |
873 | N, Standard_Program_Error); | |
874 | end if; | |
ec4867fa | 875 | end if; |
5d37ba92 ES |
876 | |
877 | if Known_Null (Expr) | |
878 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
879 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
880 | then | |
881 | Apply_Compile_Time_Constraint_Error | |
882 | (N => Expr, | |
883 | Msg => "(Ada 2005) null not allowed for " | |
884 | & "null-excluding return?", | |
885 | Reason => CE_Null_Not_Allowed); | |
886 | end if; | |
cd5a9750 AC |
887 | |
888 | -- Apply checks suggested by AI05-0144 (dangerous order dependence) | |
cd5a9750 | 889 | |
1e194575 | 890 | Check_Order_Dependence; |
ec4867fa ES |
891 | end if; |
892 | end Analyze_Function_Return; | |
893 | ||
996ae0b0 RK |
894 | ------------------------------------- |
895 | -- Analyze_Generic_Subprogram_Body -- | |
896 | ------------------------------------- | |
897 | ||
898 | procedure Analyze_Generic_Subprogram_Body | |
899 | (N : Node_Id; | |
900 | Gen_Id : Entity_Id) | |
901 | is | |
fbf5a39b | 902 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 903 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 904 | Body_Id : Entity_Id; |
996ae0b0 | 905 | New_N : Node_Id; |
fbf5a39b | 906 | Spec : Node_Id; |
996ae0b0 RK |
907 | |
908 | begin | |
82c80734 RD |
909 | -- Copy body and disable expansion while analyzing the generic For a |
910 | -- stub, do not copy the stub (which would load the proper body), this | |
911 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
912 | |
913 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
914 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
915 | Rewrite (N, New_N); | |
916 | Start_Generic; | |
917 | end if; | |
918 | ||
919 | Spec := Specification (N); | |
920 | ||
921 | -- Within the body of the generic, the subprogram is callable, and | |
922 | -- behaves like the corresponding non-generic unit. | |
923 | ||
fbf5a39b | 924 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
925 | |
926 | if Kind = E_Generic_Procedure | |
927 | and then Nkind (Spec) /= N_Procedure_Specification | |
928 | then | |
fbf5a39b | 929 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
930 | return; |
931 | ||
932 | elsif Kind = E_Generic_Function | |
933 | and then Nkind (Spec) /= N_Function_Specification | |
934 | then | |
fbf5a39b | 935 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
936 | return; |
937 | end if; | |
938 | ||
fbf5a39b | 939 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
940 | |
941 | if Has_Completion (Gen_Id) | |
942 | and then Nkind (Parent (N)) /= N_Subunit | |
943 | then | |
944 | Error_Msg_N ("duplicate generic body", N); | |
945 | return; | |
946 | else | |
947 | Set_Has_Completion (Gen_Id); | |
948 | end if; | |
949 | ||
950 | if Nkind (N) = N_Subprogram_Body_Stub then | |
951 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
952 | else | |
953 | Set_Corresponding_Spec (N, Gen_Id); | |
954 | end if; | |
955 | ||
956 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
957 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
958 | end if; | |
959 | ||
960 | -- Make generic parameters immediately visible in the body. They are | |
961 | -- needed to process the formals declarations. Then make the formals | |
962 | -- visible in a separate step. | |
963 | ||
0a36105d | 964 | Push_Scope (Gen_Id); |
996ae0b0 RK |
965 | |
966 | declare | |
967 | E : Entity_Id; | |
968 | First_Ent : Entity_Id; | |
969 | ||
970 | begin | |
971 | First_Ent := First_Entity (Gen_Id); | |
972 | ||
973 | E := First_Ent; | |
974 | while Present (E) and then not Is_Formal (E) loop | |
975 | Install_Entity (E); | |
976 | Next_Entity (E); | |
977 | end loop; | |
978 | ||
979 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
980 | ||
981 | -- Now generic formals are visible, and the specification can be | |
982 | -- analyzed, for subsequent conformance check. | |
983 | ||
fbf5a39b | 984 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 985 | |
fbf5a39b | 986 | -- Make formal parameters visible |
996ae0b0 RK |
987 | |
988 | if Present (E) then | |
989 | ||
fbf5a39b AC |
990 | -- E is the first formal parameter, we loop through the formals |
991 | -- installing them so that they will be visible. | |
996ae0b0 RK |
992 | |
993 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
994 | while Present (E) loop |
995 | Install_Entity (E); | |
996 | Next_Formal (E); | |
997 | end loop; | |
998 | end if; | |
999 | ||
e895b435 | 1000 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1001 | |
ec4867fa ES |
1002 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
1003 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
1004 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1005 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1006 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
fbf5a39b AC |
1007 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1008 | ||
1009 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1010 | ||
e895b435 | 1011 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1012 | |
1013 | Set_Ekind (Gen_Id, Kind); | |
1014 | Set_Ekind (Body_Id, Kind); | |
1015 | ||
1016 | if Present (First_Ent) then | |
1017 | Set_First_Entity (Gen_Id, First_Ent); | |
1018 | end if; | |
1019 | ||
1020 | End_Scope; | |
1021 | return; | |
1022 | end if; | |
996ae0b0 | 1023 | |
82c80734 RD |
1024 | -- If this is a compilation unit, it must be made visible explicitly, |
1025 | -- because the compilation of the declaration, unlike other library | |
1026 | -- unit declarations, does not. If it is not a unit, the following | |
1027 | -- is redundant but harmless. | |
996ae0b0 RK |
1028 | |
1029 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1030 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1031 | |
ec4867fa ES |
1032 | if Is_Child_Unit (Gen_Id) then |
1033 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1034 | end if; | |
1035 | ||
996ae0b0 | 1036 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 AC |
1037 | |
1038 | -- Deal with preconditions and postconditions. In formal verification | |
1039 | -- mode, we keep pre- and postconditions attached to entities rather | |
1040 | -- than inserted in the code, in order to facilitate a distinct | |
1041 | -- treatment for them. | |
1042 | ||
56812278 | 1043 | if not Alfa_Mode then |
483361a6 AC |
1044 | Process_PPCs (N, Gen_Id, Body_Id); |
1045 | end if; | |
0dabde3a ES |
1046 | |
1047 | -- If the generic unit carries pre- or post-conditions, copy them | |
1048 | -- to the original generic tree, so that they are properly added | |
1049 | -- to any instantiation. | |
1050 | ||
1051 | declare | |
1052 | Orig : constant Node_Id := Original_Node (N); | |
1053 | Cond : Node_Id; | |
1054 | ||
1055 | begin | |
1056 | Cond := First (Declarations (N)); | |
1057 | while Present (Cond) loop | |
1058 | if Nkind (Cond) = N_Pragma | |
1059 | and then Pragma_Name (Cond) = Name_Check | |
1060 | then | |
1061 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1062 | ||
1063 | elsif Nkind (Cond) = N_Pragma | |
1064 | and then Pragma_Name (Cond) = Name_Postcondition | |
1065 | then | |
1066 | Set_Ekind (Defining_Entity (Orig), Ekind (Gen_Id)); | |
1067 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1068 | else | |
1069 | exit; | |
1070 | end if; | |
1071 | ||
1072 | Next (Cond); | |
1073 | end loop; | |
1074 | end; | |
1075 | ||
996ae0b0 RK |
1076 | Analyze_Declarations (Declarations (N)); |
1077 | Check_Completion; | |
1078 | Analyze (Handled_Statement_Sequence (N)); | |
1079 | ||
1080 | Save_Global_References (Original_Node (N)); | |
1081 | ||
82c80734 RD |
1082 | -- Prior to exiting the scope, include generic formals again (if any |
1083 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1084 | |
1085 | if Present (First_Ent) then | |
1086 | Set_First_Entity (Gen_Id, First_Ent); | |
1087 | end if; | |
1088 | ||
fbf5a39b | 1089 | Check_References (Gen_Id); |
996ae0b0 RK |
1090 | end; |
1091 | ||
e6f69614 | 1092 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1093 | End_Scope; |
1094 | Check_Subprogram_Order (N); | |
1095 | ||
e895b435 | 1096 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1097 | |
1098 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1099 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1100 | |
1101 | if Style_Check then | |
1102 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1103 | end if; | |
13d923cc | 1104 | |
996ae0b0 | 1105 | End_Generic; |
996ae0b0 RK |
1106 | end Analyze_Generic_Subprogram_Body; |
1107 | ||
1108 | ----------------------------- | |
1109 | -- Analyze_Operator_Symbol -- | |
1110 | ----------------------------- | |
1111 | ||
82c80734 RD |
1112 | -- An operator symbol such as "+" or "and" may appear in context where the |
1113 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1114 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1115 | -- generates this node, and the semantics does the disambiguation. Other | |
1116 | -- such case are actuals in an instantiation, the generic unit in an | |
1117 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1118 | |
1119 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1120 | Par : constant Node_Id := Parent (N); | |
1121 | ||
1122 | begin | |
800621e0 RD |
1123 | if (Nkind (Par) = N_Function_Call |
1124 | and then N = Name (Par)) | |
996ae0b0 | 1125 | or else Nkind (Par) = N_Function_Instantiation |
800621e0 RD |
1126 | or else (Nkind (Par) = N_Indexed_Component |
1127 | and then N = Prefix (Par)) | |
996ae0b0 RK |
1128 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1129 | and then not Is_Pragma_String_Literal (Par)) | |
1130 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration | |
800621e0 RD |
1131 | or else (Nkind (Par) = N_Attribute_Reference |
1132 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1133 | then |
1134 | Find_Direct_Name (N); | |
1135 | ||
1136 | else | |
1137 | Change_Operator_Symbol_To_String_Literal (N); | |
1138 | Analyze (N); | |
1139 | end if; | |
1140 | end Analyze_Operator_Symbol; | |
1141 | ||
1142 | ----------------------------------- | |
1143 | -- Analyze_Parameter_Association -- | |
1144 | ----------------------------------- | |
1145 | ||
1146 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1147 | begin | |
1148 | Analyze (Explicit_Actual_Parameter (N)); | |
1149 | end Analyze_Parameter_Association; | |
1150 | ||
1151 | ---------------------------- | |
1152 | -- Analyze_Procedure_Call -- | |
1153 | ---------------------------- | |
1154 | ||
1155 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
1156 | Loc : constant Source_Ptr := Sloc (N); | |
1157 | P : constant Node_Id := Name (N); | |
1158 | Actuals : constant List_Id := Parameter_Associations (N); | |
1159 | Actual : Node_Id; | |
1160 | New_N : Node_Id; | |
1161 | ||
1162 | procedure Analyze_Call_And_Resolve; | |
1163 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1164 | -- At end, check illegal order dependence. |
996ae0b0 | 1165 | |
fbf5a39b AC |
1166 | ------------------------------ |
1167 | -- Analyze_Call_And_Resolve -- | |
1168 | ------------------------------ | |
1169 | ||
996ae0b0 RK |
1170 | procedure Analyze_Call_And_Resolve is |
1171 | begin | |
1172 | if Nkind (N) = N_Procedure_Call_Statement then | |
1173 | Analyze_Call (N); | |
1174 | Resolve (N, Standard_Void_Type); | |
cd5a9750 | 1175 | |
1e194575 | 1176 | -- Apply checks suggested by AI05-0144 |
cd5a9750 | 1177 | |
1e194575 | 1178 | Check_Order_Dependence; |
cd5a9750 | 1179 | |
996ae0b0 RK |
1180 | else |
1181 | Analyze (N); | |
1182 | end if; | |
1183 | end Analyze_Call_And_Resolve; | |
1184 | ||
1185 | -- Start of processing for Analyze_Procedure_Call | |
1186 | ||
1187 | begin | |
1188 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1189 | -- a procedure call or an entry call. The prefix may denote an access | |
1190 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1191 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1192 | -- then the construct denotes a call to a member of an entire family. |
1193 | -- If the prefix is a simple name, it may still denote a call to a | |
1194 | -- parameterless member of an entry family. Resolution of these various | |
1195 | -- interpretations is delicate. | |
1196 | ||
1197 | Analyze (P); | |
1198 | ||
758c442c GD |
1199 | -- If this is a call of the form Obj.Op, the call may have been |
1200 | -- analyzed and possibly rewritten into a block, in which case | |
1201 | -- we are done. | |
1202 | ||
1203 | if Analyzed (N) then | |
1204 | return; | |
1205 | end if; | |
1206 | ||
7415029d AC |
1207 | -- If there is an error analyzing the name (which may have been |
1208 | -- rewritten if the original call was in prefix notation) then error | |
1209 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1210 | |
7415029d AC |
1211 | if Error_Posted (N) |
1212 | or else Etype (Name (N)) = Any_Type | |
1213 | then | |
996ae0b0 RK |
1214 | Set_Etype (N, Any_Type); |
1215 | return; | |
1216 | end if; | |
1217 | ||
1218 | -- Otherwise analyze the parameters | |
1219 | ||
1220 | if Present (Actuals) then | |
1221 | Actual := First (Actuals); | |
1222 | ||
1223 | while Present (Actual) loop | |
1224 | Analyze (Actual); | |
1225 | Check_Parameterless_Call (Actual); | |
1226 | Next (Actual); | |
1227 | end loop; | |
1228 | end if; | |
1229 | ||
0bfc9a64 | 1230 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1231 | |
1232 | if Nkind (P) = N_Attribute_Reference | |
1233 | and then (Attribute_Name (P) = Name_Elab_Spec | |
0bfc9a64 AC |
1234 | or else Attribute_Name (P) = Name_Elab_Body |
1235 | or else Attribute_Name (P) = Name_Elab_Subp_Body) | |
996ae0b0 RK |
1236 | then |
1237 | if Present (Actuals) then | |
1238 | Error_Msg_N | |
1239 | ("no parameters allowed for this call", First (Actuals)); | |
1240 | return; | |
1241 | end if; | |
1242 | ||
1243 | Set_Etype (N, Standard_Void_Type); | |
1244 | Set_Analyzed (N); | |
1245 | ||
1246 | elsif Is_Entity_Name (P) | |
1247 | and then Is_Record_Type (Etype (Entity (P))) | |
1248 | and then Remote_AST_I_Dereference (P) | |
1249 | then | |
1250 | return; | |
1251 | ||
1252 | elsif Is_Entity_Name (P) | |
1253 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1254 | then | |
1255 | if Is_Access_Type (Etype (P)) | |
1256 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1257 | and then No (Actuals) | |
1258 | and then Comes_From_Source (N) | |
1259 | then | |
ed2233dc | 1260 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1261 | end if; |
1262 | ||
1263 | Analyze_Call_And_Resolve; | |
1264 | ||
1265 | -- If the prefix is the simple name of an entry family, this is | |
1266 | -- a parameterless call from within the task body itself. | |
1267 | ||
1268 | elsif Is_Entity_Name (P) | |
1269 | and then Nkind (P) = N_Identifier | |
1270 | and then Ekind (Entity (P)) = E_Entry_Family | |
1271 | and then Present (Actuals) | |
1272 | and then No (Next (First (Actuals))) | |
1273 | then | |
82c80734 RD |
1274 | -- Can be call to parameterless entry family. What appears to be the |
1275 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1276 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1277 | -- transformation. |
1278 | ||
1279 | New_N := | |
1280 | Make_Indexed_Component (Loc, | |
1281 | Prefix => | |
1282 | Make_Selected_Component (Loc, | |
1283 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1284 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1285 | Expressions => Actuals); | |
1286 | Set_Name (N, New_N); | |
1287 | Set_Etype (New_N, Standard_Void_Type); | |
1288 | Set_Parameter_Associations (N, No_List); | |
1289 | Analyze_Call_And_Resolve; | |
1290 | ||
1291 | elsif Nkind (P) = N_Explicit_Dereference then | |
1292 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1293 | Analyze_Call_And_Resolve; | |
1294 | else | |
1295 | Error_Msg_N ("expect access to procedure in call", P); | |
1296 | end if; | |
1297 | ||
82c80734 RD |
1298 | -- The name can be a selected component or an indexed component that |
1299 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1300 | -- has parameter associations. | |
996ae0b0 RK |
1301 | |
1302 | elsif Is_Access_Type (Etype (P)) | |
1303 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1304 | then | |
1305 | if Present (Actuals) then | |
1306 | Analyze_Call_And_Resolve; | |
1307 | else | |
ed2233dc | 1308 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1309 | end if; |
1310 | ||
82c80734 RD |
1311 | -- If not an access to subprogram, then the prefix must resolve to the |
1312 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1313 | |
82c80734 RD |
1314 | -- For the case of a simple entry call, P is a selected component where |
1315 | -- the prefix is the task and the selector name is the entry. A call to | |
1316 | -- a protected procedure will have the same syntax. If the protected | |
1317 | -- object contains overloaded operations, the entity may appear as a | |
1318 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1319 | |
1320 | elsif Nkind (P) = N_Selected_Component | |
1321 | and then (Ekind (Entity (Selector_Name (P))) = E_Entry | |
1322 | or else | |
1323 | Ekind (Entity (Selector_Name (P))) = E_Procedure | |
1324 | or else | |
1325 | Ekind (Entity (Selector_Name (P))) = E_Function) | |
1326 | then | |
1327 | Analyze_Call_And_Resolve; | |
1328 | ||
1329 | elsif Nkind (P) = N_Selected_Component | |
1330 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1331 | and then Present (Actuals) | |
1332 | and then No (Next (First (Actuals))) | |
1333 | then | |
82c80734 RD |
1334 | -- Can be call to parameterless entry family. What appears to be the |
1335 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1336 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1337 | -- transformation. |
1338 | ||
1339 | New_N := | |
1340 | Make_Indexed_Component (Loc, | |
1341 | Prefix => New_Copy (P), | |
1342 | Expressions => Actuals); | |
1343 | Set_Name (N, New_N); | |
1344 | Set_Etype (New_N, Standard_Void_Type); | |
1345 | Set_Parameter_Associations (N, No_List); | |
1346 | Analyze_Call_And_Resolve; | |
1347 | ||
1348 | -- For the case of a reference to an element of an entry family, P is | |
1349 | -- an indexed component whose prefix is a selected component (task and | |
1350 | -- entry family), and whose index is the entry family index. | |
1351 | ||
1352 | elsif Nkind (P) = N_Indexed_Component | |
1353 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1354 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1355 | then | |
1356 | Analyze_Call_And_Resolve; | |
1357 | ||
1358 | -- If the prefix is the name of an entry family, it is a call from | |
1359 | -- within the task body itself. | |
1360 | ||
1361 | elsif Nkind (P) = N_Indexed_Component | |
1362 | and then Nkind (Prefix (P)) = N_Identifier | |
1363 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1364 | then | |
1365 | New_N := | |
1366 | Make_Selected_Component (Loc, | |
1367 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1368 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1369 | Rewrite (Prefix (P), New_N); | |
1370 | Analyze (P); | |
1371 | Analyze_Call_And_Resolve; | |
1372 | ||
9f8d1e5c AC |
1373 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
1374 | -- procedure name, so the construct can only be a qualified expression. | |
1375 | ||
1376 | elsif Nkind (P) = N_Qualified_Expression | |
1377 | and then Ada_Version >= Ada_2012 | |
1378 | then | |
1379 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
1380 | Analyze (N); | |
1381 | ||
e895b435 | 1382 | -- Anything else is an error |
996ae0b0 RK |
1383 | |
1384 | else | |
758c442c | 1385 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 RK |
1386 | end if; |
1387 | end Analyze_Procedure_Call; | |
1388 | ||
b0186f71 AC |
1389 | ------------------------------ |
1390 | -- Analyze_Return_Statement -- | |
1391 | ------------------------------ | |
1392 | ||
1393 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1394 | ||
1395 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1396 | N_Extended_Return_Statement)); | |
1397 | ||
1398 | Returns_Object : constant Boolean := | |
1399 | Nkind (N) = N_Extended_Return_Statement | |
1400 | or else | |
1401 | (Nkind (N) = N_Simple_Return_Statement | |
1402 | and then Present (Expression (N))); | |
1403 | -- True if we're returning something; that is, "return <expression>;" | |
1404 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1405 | -- checking: If Returns_Object is True, N should apply to a function | |
1406 | -- body; otherwise N should apply to a procedure body, entry body, | |
1407 | -- accept statement, or extended return statement. | |
1408 | ||
1409 | function Find_What_It_Applies_To return Entity_Id; | |
1410 | -- Find the entity representing the innermost enclosing body, accept | |
1411 | -- statement, or extended return statement. If the result is a callable | |
1412 | -- construct or extended return statement, then this will be the value | |
1413 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1414 | -- illegal. See RM-6.5(4/2). | |
1415 | ||
1416 | ----------------------------- | |
1417 | -- Find_What_It_Applies_To -- | |
1418 | ----------------------------- | |
1419 | ||
1420 | function Find_What_It_Applies_To return Entity_Id is | |
1421 | Result : Entity_Id := Empty; | |
1422 | ||
1423 | begin | |
36b8f95f AC |
1424 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1425 | -- and postconditions. | |
b0186f71 AC |
1426 | |
1427 | for J in reverse 0 .. Scope_Stack.Last loop | |
1428 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1429 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1430 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1431 | end loop; |
1432 | ||
1433 | pragma Assert (Present (Result)); | |
1434 | return Result; | |
1435 | end Find_What_It_Applies_To; | |
1436 | ||
1437 | -- Local declarations | |
1438 | ||
1439 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1440 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1441 | Loc : constant Source_Ptr := Sloc (N); | |
1442 | Stm_Entity : constant Entity_Id := | |
1443 | New_Internal_Entity | |
1444 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1445 | ||
1446 | -- Start of processing for Analyze_Return_Statement | |
1447 | ||
1448 | begin | |
1449 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1450 | ||
1451 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1452 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1453 | ||
1454 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1455 | -- (4/2): an inner return statement will apply to this extended return. | |
1456 | ||
1457 | if Nkind (N) = N_Extended_Return_Statement then | |
1458 | Push_Scope (Stm_Entity); | |
1459 | end if; | |
1460 | ||
1461 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1462 | -- implicitly-generated return that is placed at the end. | |
1463 | ||
1464 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1465 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1466 | end if; | |
1467 | ||
1468 | -- Warn on any unassigned OUT parameters if in procedure | |
1469 | ||
1470 | if Ekind (Scope_Id) = E_Procedure then | |
1471 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1472 | end if; | |
1473 | ||
1474 | -- Check that functions return objects, and other things do not | |
1475 | ||
1476 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1477 | if not Returns_Object then | |
1478 | Error_Msg_N ("missing expression in return from function", N); | |
1479 | end if; | |
1480 | ||
1481 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1482 | if Returns_Object then | |
1483 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1484 | end if; | |
1485 | ||
1486 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1487 | if Returns_Object then | |
1488 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1489 | Error_Msg_N ("entry body cannot return value", N); | |
1490 | else | |
1491 | Error_Msg_N ("accept statement cannot return value", N); | |
1492 | end if; | |
1493 | end if; | |
1494 | ||
1495 | elsif Kind = E_Return_Statement then | |
1496 | ||
1497 | -- We are nested within another return statement, which must be an | |
1498 | -- extended_return_statement. | |
1499 | ||
1500 | if Returns_Object then | |
d0dcb2b1 AC |
1501 | if Nkind (N) = N_Extended_Return_Statement then |
1502 | Error_Msg_N | |
cc96a1b8 | 1503 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
1504 | N); |
1505 | ||
1506 | -- Case of a simple return statement with a value inside extended | |
1507 | -- return statement. | |
1508 | ||
1509 | else | |
1510 | Error_Msg_N | |
1511 | ("return nested in extended return statement cannot return " & | |
cc96a1b8 | 1512 | "value (use `RETURN;`)", N); |
d0dcb2b1 | 1513 | end if; |
b0186f71 AC |
1514 | end if; |
1515 | ||
1516 | else | |
1517 | Error_Msg_N ("illegal context for return statement", N); | |
1518 | end if; | |
1519 | ||
1520 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1521 | Analyze_Function_Return (N); | |
1522 | ||
1523 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1524 | Set_Return_Present (Scope_Id); | |
1525 | end if; | |
1526 | ||
1527 | if Nkind (N) = N_Extended_Return_Statement then | |
1528 | End_Scope; | |
1529 | end if; | |
1530 | ||
1531 | Kill_Current_Values (Last_Assignment_Only => True); | |
1532 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
1533 | |
1534 | Analyze_Dimension (N); | |
b0186f71 AC |
1535 | end Analyze_Return_Statement; |
1536 | ||
5d37ba92 ES |
1537 | ------------------------------------- |
1538 | -- Analyze_Simple_Return_Statement -- | |
1539 | ------------------------------------- | |
ec4867fa | 1540 | |
5d37ba92 | 1541 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1542 | begin |
5d37ba92 ES |
1543 | if Present (Expression (N)) then |
1544 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1545 | end if; |
1546 | ||
5d37ba92 ES |
1547 | Analyze_Return_Statement (N); |
1548 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1549 | |
82c80734 RD |
1550 | ------------------------- |
1551 | -- Analyze_Return_Type -- | |
1552 | ------------------------- | |
1553 | ||
1554 | procedure Analyze_Return_Type (N : Node_Id) is | |
1555 | Designator : constant Entity_Id := Defining_Entity (N); | |
1556 | Typ : Entity_Id := Empty; | |
1557 | ||
1558 | begin | |
ec4867fa ES |
1559 | -- Normal case where result definition does not indicate an error |
1560 | ||
41251c60 JM |
1561 | if Result_Definition (N) /= Error then |
1562 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
2ba431e5 | 1563 | Check_SPARK_Restriction |
fe5d3068 | 1564 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1565 | |
b1c11e0e JM |
1566 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1567 | ||
1568 | declare | |
1569 | AD : constant Node_Id := | |
1570 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1571 | begin | |
1572 | if Present (AD) and then Protected_Present (AD) then | |
1573 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1574 | else | |
1575 | Typ := Access_Definition (N, Result_Definition (N)); | |
1576 | end if; | |
1577 | end; | |
1578 | ||
41251c60 JM |
1579 | Set_Parent (Typ, Result_Definition (N)); |
1580 | Set_Is_Local_Anonymous_Access (Typ); | |
1581 | Set_Etype (Designator, Typ); | |
1582 | ||
b66c3ff4 AC |
1583 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1584 | ||
1585 | Null_Exclusion_Static_Checks (N); | |
1586 | ||
41251c60 JM |
1587 | -- Subtype_Mark case |
1588 | ||
1589 | else | |
1590 | Find_Type (Result_Definition (N)); | |
1591 | Typ := Entity (Result_Definition (N)); | |
1592 | Set_Etype (Designator, Typ); | |
1593 | ||
2ba431e5 | 1594 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1595 | |
fe5d3068 | 1596 | if Is_Array_Type (Typ) |
daec8eeb YM |
1597 | and then not Is_Constrained (Typ) |
1598 | then | |
2ba431e5 | 1599 | Check_SPARK_Restriction |
fe5d3068 | 1600 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1601 | Result_Definition (N)); |
daec8eeb YM |
1602 | end if; |
1603 | ||
b66c3ff4 AC |
1604 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1605 | ||
1606 | Null_Exclusion_Static_Checks (N); | |
1607 | ||
1608 | -- If a null exclusion is imposed on the result type, then create | |
1609 | -- a null-excluding itype (an access subtype) and use it as the | |
1610 | -- function's Etype. Note that the null exclusion checks are done | |
1611 | -- right before this, because they don't get applied to types that | |
1612 | -- do not come from source. | |
1613 | ||
1614 | if Is_Access_Type (Typ) | |
1615 | and then Null_Exclusion_Present (N) | |
1616 | then | |
1617 | Set_Etype (Designator, | |
1618 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
1619 | (T => Typ, |
1620 | Related_Nod => N, | |
1621 | Scope_Id => Scope (Current_Scope))); | |
1622 | ||
1623 | -- The new subtype must be elaborated before use because | |
1624 | -- it is visible outside of the function. However its base | |
1625 | -- type may not be frozen yet, so the reference that will | |
1626 | -- force elaboration must be attached to the freezing of | |
1627 | -- the base type. | |
1628 | ||
212863c0 AC |
1629 | -- If the return specification appears on a proper body, |
1630 | -- the subtype will have been created already on the spec. | |
1631 | ||
ff7139c3 | 1632 | if Is_Frozen (Typ) then |
212863c0 AC |
1633 | if Nkind (Parent (N)) = N_Subprogram_Body |
1634 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
1635 | then | |
1636 | null; | |
1637 | else | |
1638 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
1639 | end if; | |
1640 | ||
ff7139c3 AC |
1641 | else |
1642 | Ensure_Freeze_Node (Typ); | |
1643 | ||
1644 | declare | |
212863c0 | 1645 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
1646 | begin |
1647 | Set_Itype (IR, Etype (Designator)); | |
1648 | Append_Freeze_Actions (Typ, New_List (IR)); | |
1649 | end; | |
1650 | end if; | |
1651 | ||
b66c3ff4 AC |
1652 | else |
1653 | Set_Etype (Designator, Typ); | |
1654 | end if; | |
1655 | ||
41251c60 | 1656 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
1657 | and then Is_Value_Type (Typ) |
1658 | then | |
1659 | null; | |
1660 | ||
1661 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 JM |
1662 | or else (Is_Class_Wide_Type (Typ) |
1663 | and then | |
1664 | Ekind (Root_Type (Typ)) = E_Incomplete_Type) | |
1665 | then | |
dd386db0 AC |
1666 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
1667 | -- parts. Untagged incomplete types are not allowed in bodies. | |
1668 | ||
1669 | if Ada_Version >= Ada_2012 then | |
1670 | if Is_Tagged_Type (Typ) then | |
1671 | null; | |
1672 | ||
1673 | elsif Nkind_In (Parent (Parent (N)), | |
1674 | N_Accept_Statement, | |
1675 | N_Entry_Body, | |
1676 | N_Subprogram_Body) | |
1677 | then | |
1678 | Error_Msg_NE | |
1679 | ("invalid use of untagged incomplete type&", | |
1680 | Designator, Typ); | |
1681 | end if; | |
1682 | ||
63be2a5a AC |
1683 | -- The type must be completed in the current package. This |
1684 | -- is checked at the end of the package declaraton, when | |
7b7a0c2b AC |
1685 | -- Taft-amendment types are identified. If the return type |
1686 | -- is class-wide, there is no required check, the type can | |
1687 | -- be a bona fide TAT. | |
63be2a5a AC |
1688 | |
1689 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 1690 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 1691 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
1692 | then |
1693 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
1694 | end if; | |
1695 | ||
dd386db0 AC |
1696 | else |
1697 | Error_Msg_NE | |
1698 | ("invalid use of incomplete type&", Designator, Typ); | |
1699 | end if; | |
41251c60 | 1700 | end if; |
82c80734 RD |
1701 | end if; |
1702 | ||
ec4867fa ES |
1703 | -- Case where result definition does indicate an error |
1704 | ||
82c80734 RD |
1705 | else |
1706 | Set_Etype (Designator, Any_Type); | |
1707 | end if; | |
1708 | end Analyze_Return_Type; | |
1709 | ||
996ae0b0 RK |
1710 | ----------------------------- |
1711 | -- Analyze_Subprogram_Body -- | |
1712 | ----------------------------- | |
1713 | ||
b1b543d2 BD |
1714 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
1715 | Loc : constant Source_Ptr := Sloc (N); | |
1716 | Body_Spec : constant Node_Id := Specification (N); | |
1717 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
1718 | ||
1719 | begin | |
1720 | if Debug_Flag_C then | |
1721 | Write_Str ("==> subprogram body "); | |
1722 | Write_Name (Chars (Body_Id)); | |
1723 | Write_Str (" from "); | |
1724 | Write_Location (Loc); | |
1725 | Write_Eol; | |
1726 | Indent; | |
1727 | end if; | |
1728 | ||
1729 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
1730 | ||
1731 | -- The real work is split out into the helper, so it can do "return;" | |
1732 | -- without skipping the debug output: | |
1733 | ||
1734 | Analyze_Subprogram_Body_Helper (N); | |
1735 | ||
1736 | if Debug_Flag_C then | |
1737 | Outdent; | |
1738 | Write_Str ("<== subprogram body "); | |
1739 | Write_Name (Chars (Body_Id)); | |
1740 | Write_Str (" from "); | |
1741 | Write_Location (Loc); | |
1742 | Write_Eol; | |
1743 | end if; | |
1744 | end Analyze_Subprogram_Body; | |
1745 | ||
1746 | ------------------------------------ | |
1747 | -- Analyze_Subprogram_Body_Helper -- | |
1748 | ------------------------------------ | |
1749 | ||
996ae0b0 RK |
1750 | -- This procedure is called for regular subprogram bodies, generic bodies, |
1751 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
1752 | -- specification matters, and is used to create a proper declaration for | |
1753 | -- the subprogram, or to perform conformance checks. | |
1754 | ||
b1b543d2 | 1755 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b | 1756 | Loc : constant Source_Ptr := Sloc (N); |
33931112 | 1757 | Body_Deleted : constant Boolean := False; |
fbf5a39b AC |
1758 | Body_Spec : constant Node_Id := Specification (N); |
1759 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
1760 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 1761 | Conformant : Boolean; |
21d27997 | 1762 | HSS : Node_Id; |
07fc65c4 | 1763 | P_Ent : Entity_Id; |
21d27997 RD |
1764 | Prot_Typ : Entity_Id := Empty; |
1765 | Spec_Id : Entity_Id; | |
1766 | Spec_Decl : Node_Id := Empty; | |
1767 | ||
1768 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
1769 | -- When we analyze a separate spec, the entity chain ends up containing | |
1770 | -- the formals, as well as any itypes generated during analysis of the | |
1771 | -- default expressions for parameters, or the arguments of associated | |
1772 | -- precondition/postcondition pragmas (which are analyzed in the context | |
1773 | -- of the spec since they have visibility on formals). | |
1774 | -- | |
1775 | -- These entities belong with the spec and not the body. However we do | |
1776 | -- the analysis of the body in the context of the spec (again to obtain | |
1777 | -- visibility to the formals), and all the entities generated during | |
1778 | -- this analysis end up also chained to the entity chain of the spec. | |
1779 | -- But they really belong to the body, and there is circuitry to move | |
1780 | -- them from the spec to the body. | |
1781 | -- | |
1782 | -- However, when we do this move, we don't want to move the real spec | |
1783 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
1784 | -- variable points to the last real spec entity, so we only move those | |
1785 | -- chained beyond that point. It is initialized to Empty to deal with | |
1786 | -- the case where there is no separate spec. | |
996ae0b0 | 1787 | |
ec4867fa | 1788 | procedure Check_Anonymous_Return; |
e50e1c5e | 1789 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
1790 | -- or a type that contains tasks, we must create a master entity for |
1791 | -- the anonymous type, which typically will be used in an allocator | |
1792 | -- in the body of the function. | |
1793 | ||
e660dbf7 JM |
1794 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
1795 | -- Look ahead to recognize a pragma that may appear after the body. | |
1796 | -- If there is a previous spec, check that it appears in the same | |
1797 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
1798 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
1799 | -- If the body acts as a spec, and inlining is required, we create a | |
1800 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
1801 | -- If pragma does not appear after the body, check whether there is |
1802 | -- an inline pragma before any local declarations. | |
c37bb106 | 1803 | |
7665e4bd AC |
1804 | procedure Check_Missing_Return; |
1805 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
1806 | -- the warning checks implemented by Check_Returns. In formal mode, also |
1807 | -- verify that a function ends with a RETURN and that a procedure does | |
1808 | -- not contain any RETURN. | |
7665e4bd | 1809 | |
d44202ba HK |
1810 | function Disambiguate_Spec return Entity_Id; |
1811 | -- When a primitive is declared between the private view and the full | |
1812 | -- view of a concurrent type which implements an interface, a special | |
1813 | -- mechanism is used to find the corresponding spec of the primitive | |
1814 | -- body. | |
1815 | ||
5dcab3ca AC |
1816 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id); |
1817 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains | |
1818 | -- incomplete types coming from a limited context and swap their limited | |
1819 | -- views with the non-limited ones. | |
1820 | ||
d44202ba HK |
1821 | function Is_Private_Concurrent_Primitive |
1822 | (Subp_Id : Entity_Id) return Boolean; | |
1823 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
1824 | -- type that implements an interface and has a private view. | |
1825 | ||
76a69663 ES |
1826 | procedure Set_Trivial_Subprogram (N : Node_Id); |
1827 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
1828 | -- subprogram whose body is being analyzed. N is the statement node | |
1829 | -- causing the flag to be set, if the following statement is a return | |
1830 | -- of an entity, we mark the entity as set in source to suppress any | |
1831 | -- warning on the stylized use of function stubs with a dummy return. | |
1832 | ||
758c442c GD |
1833 | procedure Verify_Overriding_Indicator; |
1834 | -- If there was a previous spec, the entity has been entered in the | |
1835 | -- current scope previously. If the body itself carries an overriding | |
1836 | -- indicator, check that it is consistent with the known status of the | |
1837 | -- entity. | |
1838 | ||
ec4867fa ES |
1839 | ---------------------------- |
1840 | -- Check_Anonymous_Return -- | |
1841 | ---------------------------- | |
1842 | ||
1843 | procedure Check_Anonymous_Return is | |
1844 | Decl : Node_Id; | |
a523b302 | 1845 | Par : Node_Id; |
ec4867fa ES |
1846 | Scop : Entity_Id; |
1847 | ||
1848 | begin | |
1849 | if Present (Spec_Id) then | |
1850 | Scop := Spec_Id; | |
1851 | else | |
1852 | Scop := Body_Id; | |
1853 | end if; | |
1854 | ||
1855 | if Ekind (Scop) = E_Function | |
1856 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 JM |
1857 | and then not Is_Thunk (Scop) |
1858 | and then (Has_Task (Designated_Type (Etype (Scop))) | |
1859 | or else | |
1860 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) | |
1861 | and then | |
1862 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 1863 | and then Expander_Active |
b20de9b9 AC |
1864 | |
1865 | -- Avoid cases with no tasking support | |
1866 | ||
1867 | and then RTE_Available (RE_Current_Master) | |
1868 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
1869 | then |
1870 | Decl := | |
1871 | Make_Object_Declaration (Loc, | |
1872 | Defining_Identifier => | |
1873 | Make_Defining_Identifier (Loc, Name_uMaster), | |
1874 | Constant_Present => True, | |
1875 | Object_Definition => | |
1876 | New_Reference_To (RTE (RE_Master_Id), Loc), | |
1877 | Expression => | |
1878 | Make_Explicit_Dereference (Loc, | |
1879 | New_Reference_To (RTE (RE_Current_Master), Loc))); | |
1880 | ||
1881 | if Present (Declarations (N)) then | |
1882 | Prepend (Decl, Declarations (N)); | |
1883 | else | |
1884 | Set_Declarations (N, New_List (Decl)); | |
1885 | end if; | |
1886 | ||
1887 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
1888 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
1889 | |
1890 | -- Now mark the containing scope as a task master | |
1891 | ||
1892 | Par := N; | |
1893 | while Nkind (Par) /= N_Compilation_Unit loop | |
1894 | Par := Parent (Par); | |
1895 | pragma Assert (Present (Par)); | |
1896 | ||
1897 | -- If we fall off the top, we are at the outer level, and | |
1898 | -- the environment task is our effective master, so nothing | |
1899 | -- to mark. | |
1900 | ||
1901 | if Nkind_In | |
1902 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
1903 | then | |
1904 | Set_Is_Task_Master (Par, True); | |
1905 | exit; | |
1906 | end if; | |
1907 | end loop; | |
ec4867fa ES |
1908 | end if; |
1909 | end Check_Anonymous_Return; | |
1910 | ||
e660dbf7 JM |
1911 | ------------------------- |
1912 | -- Check_Inline_Pragma -- | |
1913 | ------------------------- | |
758c442c | 1914 | |
e660dbf7 JM |
1915 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
1916 | Prag : Node_Id; | |
1917 | Plist : List_Id; | |
0fb2ea01 | 1918 | |
21d27997 | 1919 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 1920 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 1921 | -- to this subprogram. |
21d27997 RD |
1922 | |
1923 | ----------------------- | |
1924 | -- Is_Inline_Pragma -- | |
1925 | ----------------------- | |
1926 | ||
1927 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
1928 | begin | |
1929 | return | |
1930 | Nkind (N) = N_Pragma | |
1931 | and then | |
1932 | (Pragma_Name (N) = Name_Inline_Always | |
1933 | or else | |
1934 | (Front_End_Inlining | |
1935 | and then Pragma_Name (N) = Name_Inline)) | |
1936 | and then | |
1937 | Chars | |
1938 | (Expression (First (Pragma_Argument_Associations (N)))) | |
1939 | = Chars (Body_Id); | |
1940 | end Is_Inline_Pragma; | |
1941 | ||
1942 | -- Start of processing for Check_Inline_Pragma | |
1943 | ||
c37bb106 | 1944 | begin |
e660dbf7 JM |
1945 | if not Expander_Active then |
1946 | return; | |
1947 | end if; | |
1948 | ||
1949 | if Is_List_Member (N) | |
1950 | and then Present (Next (N)) | |
21d27997 | 1951 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
1952 | then |
1953 | Prag := Next (N); | |
1954 | ||
21d27997 RD |
1955 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
1956 | and then Present (Declarations (N)) | |
1957 | and then Is_Inline_Pragma (First (Declarations (N))) | |
1958 | then | |
1959 | Prag := First (Declarations (N)); | |
1960 | ||
e660dbf7 JM |
1961 | else |
1962 | Prag := Empty; | |
c37bb106 | 1963 | end if; |
e660dbf7 JM |
1964 | |
1965 | if Present (Prag) then | |
1966 | if Present (Spec_Id) then | |
30196a76 | 1967 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
1968 | Analyze (Prag); |
1969 | end if; | |
1970 | ||
1971 | else | |
d39d6bb8 | 1972 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
1973 | |
1974 | declare | |
1975 | Subp : constant Entity_Id := | |
30196a76 | 1976 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 1977 | Decl : constant Node_Id := |
30196a76 RD |
1978 | Make_Subprogram_Declaration (Loc, |
1979 | Specification => | |
1980 | New_Copy_Tree (Specification (N))); | |
1981 | ||
e660dbf7 JM |
1982 | begin |
1983 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
1984 | ||
1985 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 1986 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
1987 | Set_Parameter_Specifications |
1988 | (Specification (Decl), Plist); | |
1989 | end if; | |
1990 | ||
1991 | Insert_Before (N, Decl); | |
1992 | Analyze (Decl); | |
1993 | Analyze (Prag); | |
1994 | Set_Has_Pragma_Inline (Subp); | |
1995 | ||
76a69663 | 1996 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 1997 | Set_Is_Inlined (Subp); |
21d27997 | 1998 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
1999 | end if; |
2000 | ||
2001 | Spec := Subp; | |
2002 | end; | |
2003 | end if; | |
2004 | end if; | |
2005 | end Check_Inline_Pragma; | |
2006 | ||
7665e4bd AC |
2007 | -------------------------- |
2008 | -- Check_Missing_Return -- | |
2009 | -------------------------- | |
2010 | ||
2011 | procedure Check_Missing_Return is | |
2012 | Id : Entity_Id; | |
2013 | Missing_Ret : Boolean; | |
2014 | ||
2015 | begin | |
2016 | if Nkind (Body_Spec) = N_Function_Specification then | |
2017 | if Present (Spec_Id) then | |
2018 | Id := Spec_Id; | |
2019 | else | |
2020 | Id := Body_Id; | |
2021 | end if; | |
2022 | ||
fe5d3068 | 2023 | if Return_Present (Id) then |
7665e4bd AC |
2024 | Check_Returns (HSS, 'F', Missing_Ret); |
2025 | ||
2026 | if Missing_Ret then | |
2027 | Set_Has_Missing_Return (Id); | |
2028 | end if; | |
2029 | ||
2030 | elsif (Is_Generic_Subprogram (Id) | |
2031 | or else not Is_Machine_Code_Subprogram (Id)) | |
2032 | and then not Body_Deleted | |
2033 | then | |
2034 | Error_Msg_N ("missing RETURN statement in function body", N); | |
2035 | end if; | |
2036 | ||
fe5d3068 | 2037 | -- If procedure with No_Return, check returns |
607d0635 | 2038 | |
fe5d3068 YM |
2039 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
2040 | and then Present (Spec_Id) | |
2041 | and then No_Return (Spec_Id) | |
607d0635 | 2042 | then |
fe5d3068 YM |
2043 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
2044 | end if; | |
2045 | ||
ad05f2e9 | 2046 | -- Special checks in SPARK mode |
fe5d3068 YM |
2047 | |
2048 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 2049 | |
ad05f2e9 | 2050 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
2051 | |
2052 | declare | |
2053 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
2054 | begin | |
2055 | if Present (Stat) | |
7394c8cc AC |
2056 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
2057 | N_Extended_Return_Statement) | |
fe5d3068 | 2058 | then |
2ba431e5 | 2059 | Check_SPARK_Restriction |
fe5d3068 YM |
2060 | ("last statement in function should be RETURN", Stat); |
2061 | end if; | |
2062 | end; | |
2063 | ||
ad05f2e9 | 2064 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
2065 | |
2066 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
2067 | if Present (Spec_Id) then |
2068 | Id := Spec_Id; | |
2069 | else | |
2070 | Id := Body_Id; | |
2071 | end if; | |
2072 | ||
8d606a78 RD |
2073 | -- Would be nice to point to return statement here, can we |
2074 | -- borrow the Check_Returns procedure here ??? | |
2075 | ||
607d0635 | 2076 | if Return_Present (Id) then |
2ba431e5 | 2077 | Check_SPARK_Restriction |
fe5d3068 | 2078 | ("procedure should not have RETURN", N); |
607d0635 | 2079 | end if; |
7665e4bd AC |
2080 | end if; |
2081 | end Check_Missing_Return; | |
2082 | ||
d44202ba HK |
2083 | ----------------------- |
2084 | -- Disambiguate_Spec -- | |
2085 | ----------------------- | |
2086 | ||
2087 | function Disambiguate_Spec return Entity_Id is | |
2088 | Priv_Spec : Entity_Id; | |
2089 | Spec_N : Entity_Id; | |
2090 | ||
2091 | procedure Replace_Types (To_Corresponding : Boolean); | |
2092 | -- Depending on the flag, replace the type of formal parameters of | |
2093 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2094 | -- the corresponding record type or the other way around. | |
2095 | ||
2096 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2097 | Formal : Entity_Id; | |
2098 | Formal_Typ : Entity_Id; | |
2099 | ||
2100 | begin | |
2101 | Formal := First_Formal (Body_Id); | |
2102 | while Present (Formal) loop | |
2103 | Formal_Typ := Etype (Formal); | |
2104 | ||
df3e68b1 HK |
2105 | if Is_Class_Wide_Type (Formal_Typ) then |
2106 | Formal_Typ := Root_Type (Formal_Typ); | |
2107 | end if; | |
2108 | ||
d44202ba HK |
2109 | -- From concurrent type to corresponding record |
2110 | ||
2111 | if To_Corresponding then | |
2112 | if Is_Concurrent_Type (Formal_Typ) | |
2113 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
2114 | and then Present (Interfaces ( | |
2115 | Corresponding_Record_Type (Formal_Typ))) | |
2116 | then | |
2117 | Set_Etype (Formal, | |
2118 | Corresponding_Record_Type (Formal_Typ)); | |
2119 | end if; | |
2120 | ||
2121 | -- From corresponding record to concurrent type | |
2122 | ||
2123 | else | |
2124 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2125 | and then Present (Interfaces (Formal_Typ)) | |
2126 | then | |
2127 | Set_Etype (Formal, | |
2128 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2129 | end if; | |
2130 | end if; | |
2131 | ||
2132 | Next_Formal (Formal); | |
2133 | end loop; | |
2134 | end Replace_Types; | |
2135 | ||
2136 | -- Start of processing for Disambiguate_Spec | |
2137 | ||
2138 | begin | |
2139 | -- Try to retrieve the specification of the body as is. All error | |
2140 | -- messages are suppressed because the body may not have a spec in | |
2141 | -- its current state. | |
2142 | ||
2143 | Spec_N := Find_Corresponding_Spec (N, False); | |
2144 | ||
2145 | -- It is possible that this is the body of a primitive declared | |
2146 | -- between a private and a full view of a concurrent type. The | |
2147 | -- controlling parameter of the spec carries the concurrent type, | |
2148 | -- not the corresponding record type as transformed by Analyze_ | |
2149 | -- Subprogram_Specification. In such cases, we undo the change | |
2150 | -- made by the analysis of the specification and try to find the | |
2151 | -- spec again. | |
766d7add | 2152 | |
8198b93d HK |
2153 | -- Note that wrappers already have their corresponding specs and |
2154 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2155 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2156 | -- original concurrent status. |
d44202ba | 2157 | |
8198b93d HK |
2158 | if No (Spec_N) |
2159 | or else Is_Primitive_Wrapper (Spec_N) | |
2160 | then | |
d44202ba HK |
2161 | -- Restore all references of corresponding record types to the |
2162 | -- original concurrent types. | |
2163 | ||
2164 | Replace_Types (To_Corresponding => False); | |
2165 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2166 | ||
2167 | -- The current body truly belongs to a primitive declared between | |
2168 | -- a private and a full view. We leave the modified body as is, | |
2169 | -- and return the true spec. | |
2170 | ||
2171 | if Present (Priv_Spec) | |
2172 | and then Is_Private_Primitive (Priv_Spec) | |
2173 | then | |
2174 | return Priv_Spec; | |
2175 | end if; | |
2176 | ||
2177 | -- In case that this is some sort of error, restore the original | |
2178 | -- state of the body. | |
2179 | ||
2180 | Replace_Types (To_Corresponding => True); | |
2181 | end if; | |
2182 | ||
2183 | return Spec_N; | |
2184 | end Disambiguate_Spec; | |
2185 | ||
5dcab3ca AC |
2186 | ---------------------------- |
2187 | -- Exchange_Limited_Views -- | |
2188 | ---------------------------- | |
2189 | ||
2190 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id) is | |
2191 | procedure Detect_And_Exchange (Id : Entity_Id); | |
2192 | -- Determine whether Id's type denotes an incomplete type associated | |
2193 | -- with a limited with clause and exchange the limited view with the | |
2194 | -- non-limited one. | |
2195 | ||
2196 | ------------------------- | |
2197 | -- Detect_And_Exchange -- | |
2198 | ------------------------- | |
2199 | ||
2200 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
2201 | Typ : constant Entity_Id := Etype (Id); | |
2202 | ||
2203 | begin | |
2204 | if Ekind (Typ) = E_Incomplete_Type | |
2205 | and then From_With_Type (Typ) | |
2206 | and then Present (Non_Limited_View (Typ)) | |
2207 | then | |
2208 | Set_Etype (Id, Non_Limited_View (Typ)); | |
2209 | end if; | |
2210 | end Detect_And_Exchange; | |
2211 | ||
2212 | -- Local variables | |
2213 | ||
2214 | Formal : Entity_Id; | |
2215 | ||
2216 | -- Start of processing for Exchange_Limited_Views | |
2217 | ||
2218 | begin | |
2219 | if No (Subp_Id) then | |
2220 | return; | |
2221 | ||
2222 | -- Do not process subprogram bodies as they already use the non- | |
2223 | -- limited view of types. | |
2224 | ||
2225 | elsif not Ekind_In (Subp_Id, E_Function, E_Procedure) then | |
2226 | return; | |
2227 | end if; | |
2228 | ||
2229 | -- Examine all formals and swap views when applicable | |
2230 | ||
2231 | Formal := First_Formal (Subp_Id); | |
2232 | while Present (Formal) loop | |
2233 | Detect_And_Exchange (Formal); | |
2234 | ||
2235 | Next_Formal (Formal); | |
2236 | end loop; | |
2237 | ||
2238 | -- Process the return type of a function | |
2239 | ||
2240 | if Ekind (Subp_Id) = E_Function then | |
2241 | Detect_And_Exchange (Subp_Id); | |
2242 | end if; | |
2243 | end Exchange_Limited_Views; | |
2244 | ||
d44202ba HK |
2245 | ------------------------------------- |
2246 | -- Is_Private_Concurrent_Primitive -- | |
2247 | ------------------------------------- | |
2248 | ||
2249 | function Is_Private_Concurrent_Primitive | |
2250 | (Subp_Id : Entity_Id) return Boolean | |
2251 | is | |
2252 | Formal_Typ : Entity_Id; | |
2253 | ||
2254 | begin | |
2255 | if Present (First_Formal (Subp_Id)) then | |
2256 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2257 | ||
2258 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2259 | if Is_Class_Wide_Type (Formal_Typ) then |
2260 | Formal_Typ := Root_Type (Formal_Typ); | |
2261 | end if; | |
2262 | ||
d44202ba HK |
2263 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2264 | end if; | |
2265 | ||
2266 | -- The type of the first formal is a concurrent tagged type with | |
2267 | -- a private view. | |
2268 | ||
2269 | return | |
2270 | Is_Concurrent_Type (Formal_Typ) | |
2271 | and then Is_Tagged_Type (Formal_Typ) | |
2272 | and then Has_Private_Declaration (Formal_Typ); | |
2273 | end if; | |
2274 | ||
2275 | return False; | |
2276 | end Is_Private_Concurrent_Primitive; | |
2277 | ||
76a69663 ES |
2278 | ---------------------------- |
2279 | -- Set_Trivial_Subprogram -- | |
2280 | ---------------------------- | |
2281 | ||
2282 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2283 | Nxt : constant Node_Id := Next (N); | |
2284 | ||
2285 | begin | |
2286 | Set_Is_Trivial_Subprogram (Body_Id); | |
2287 | ||
2288 | if Present (Spec_Id) then | |
2289 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2290 | end if; | |
2291 | ||
2292 | if Present (Nxt) | |
2293 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2294 | and then No (Next (Nxt)) | |
2295 | and then Present (Expression (Nxt)) | |
2296 | and then Is_Entity_Name (Expression (Nxt)) | |
2297 | then | |
2298 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2299 | end if; | |
2300 | end Set_Trivial_Subprogram; | |
2301 | ||
758c442c GD |
2302 | --------------------------------- |
2303 | -- Verify_Overriding_Indicator -- | |
2304 | --------------------------------- | |
2305 | ||
2306 | procedure Verify_Overriding_Indicator is | |
2307 | begin | |
21d27997 RD |
2308 | if Must_Override (Body_Spec) then |
2309 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
2310 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2311 | then | |
2312 | null; | |
2313 | ||
038140ed | 2314 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2315 | Error_Msg_NE |
21d27997 RD |
2316 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
2317 | end if; | |
758c442c | 2318 | |
5d37ba92 | 2319 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2320 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2321 | Error_Msg_NE |
5d37ba92 | 2322 | ("subprogram& overrides inherited operation", |
76a69663 | 2323 | Body_Spec, Spec_Id); |
5d37ba92 | 2324 | |
21d27997 RD |
2325 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
2326 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2327 | then | |
ed2233dc | 2328 | Error_Msg_NE |
21d27997 RD |
2329 | ("subprogram & overrides predefined operator ", |
2330 | Body_Spec, Spec_Id); | |
2331 | ||
618fb570 AC |
2332 | -- If this is not a primitive operation or protected subprogram, |
2333 | -- then the overriding indicator is altogether illegal. | |
5d37ba92 | 2334 | |
618fb570 AC |
2335 | elsif not Is_Primitive (Spec_Id) |
2336 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type | |
2337 | then | |
ed2233dc | 2338 | Error_Msg_N |
19d846a0 RD |
2339 | ("overriding indicator only allowed " & |
2340 | "if subprogram is primitive", | |
2341 | Body_Spec); | |
5d37ba92 | 2342 | end if; |
235f4375 | 2343 | |
806f6d37 | 2344 | elsif Style_Check |
038140ed | 2345 | and then Present (Overridden_Operation (Spec_Id)) |
235f4375 AC |
2346 | then |
2347 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2348 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
2349 | |
2350 | elsif Style_Check | |
2351 | and then Can_Override_Operator (Spec_Id) | |
2352 | and then not Is_Predefined_File_Name | |
2353 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
2354 | then | |
2355 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2356 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
2357 | end if; |
2358 | end Verify_Overriding_Indicator; | |
2359 | ||
b1b543d2 | 2360 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 2361 | |
996ae0b0 | 2362 | begin |
82c80734 RD |
2363 | -- Generic subprograms are handled separately. They always have a |
2364 | -- generic specification. Determine whether current scope has a | |
2365 | -- previous declaration. | |
996ae0b0 | 2366 | |
82c80734 RD |
2367 | -- If the subprogram body is defined within an instance of the same |
2368 | -- name, the instance appears as a package renaming, and will be hidden | |
2369 | -- within the subprogram. | |
996ae0b0 RK |
2370 | |
2371 | if Present (Prev_Id) | |
2372 | and then not Is_Overloadable (Prev_Id) | |
2373 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
2374 | or else Comes_From_Source (Prev_Id)) | |
2375 | then | |
fbf5a39b | 2376 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 RK |
2377 | Spec_Id := Prev_Id; |
2378 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2379 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2380 | ||
2381 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
2382 | |
2383 | if Nkind (N) = N_Subprogram_Body then | |
2384 | HSS := Handled_Statement_Sequence (N); | |
2385 | Check_Missing_Return; | |
2386 | end if; | |
2387 | ||
996ae0b0 RK |
2388 | return; |
2389 | ||
2390 | else | |
82c80734 RD |
2391 | -- Previous entity conflicts with subprogram name. Attempting to |
2392 | -- enter name will post error. | |
996ae0b0 RK |
2393 | |
2394 | Enter_Name (Body_Id); | |
2395 | return; | |
2396 | end if; | |
2397 | ||
82c80734 RD |
2398 | -- Non-generic case, find the subprogram declaration, if one was seen, |
2399 | -- or enter new overloaded entity in the current scope. If the | |
2400 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
2401 | -- part of the context of one of its subunits. No need to redo the | |
2402 | -- analysis. | |
996ae0b0 RK |
2403 | |
2404 | elsif Prev_Id = Body_Id | |
2405 | and then Has_Completion (Body_Id) | |
2406 | then | |
2407 | return; | |
2408 | ||
2409 | else | |
fbf5a39b | 2410 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
2411 | |
2412 | if Nkind (N) = N_Subprogram_Body_Stub | |
2413 | or else No (Corresponding_Spec (N)) | |
2414 | then | |
d44202ba HK |
2415 | if Is_Private_Concurrent_Primitive (Body_Id) then |
2416 | Spec_Id := Disambiguate_Spec; | |
2417 | else | |
2418 | Spec_Id := Find_Corresponding_Spec (N); | |
2419 | end if; | |
996ae0b0 RK |
2420 | |
2421 | -- If this is a duplicate body, no point in analyzing it | |
2422 | ||
2423 | if Error_Posted (N) then | |
2424 | return; | |
2425 | end if; | |
2426 | ||
82c80734 RD |
2427 | -- A subprogram body should cause freezing of its own declaration, |
2428 | -- but if there was no previous explicit declaration, then the | |
2429 | -- subprogram will get frozen too late (there may be code within | |
2430 | -- the body that depends on the subprogram having been frozen, | |
2431 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 2432 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
2433 | -- Finally, if the return type is an anonymous access to protected |
2434 | -- subprogram, it must be frozen before the body because its | |
2435 | -- expansion has generated an equivalent type that is used when | |
2436 | -- elaborating the body. | |
996ae0b0 | 2437 | |
885c4871 | 2438 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
2439 | -- created for expression functions do not freeze. |
2440 | ||
2441 | if No (Spec_Id) | |
2442 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
2443 | then | |
996ae0b0 RK |
2444 | Freeze_Before (N, Body_Id); |
2445 | ||
2446 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
2447 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
2448 | |
2449 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
2450 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 2451 | end if; |
a38ff9b1 | 2452 | |
996ae0b0 RK |
2453 | else |
2454 | Spec_Id := Corresponding_Spec (N); | |
2455 | end if; | |
2456 | end if; | |
2457 | ||
82c80734 RD |
2458 | -- Do not inline any subprogram that contains nested subprograms, since |
2459 | -- the backend inlining circuit seems to generate uninitialized | |
07fc65c4 | 2460 | -- references in this case. We know this happens in the case of front |
82c80734 RD |
2461 | -- end ZCX support, but it also appears it can happen in other cases as |
2462 | -- well. The backend often rejects attempts to inline in the case of | |
2463 | -- nested procedures anyway, so little if anything is lost by this. | |
2464 | -- Note that this is test is for the benefit of the back-end. There is | |
2465 | -- a separate test for front-end inlining that also rejects nested | |
2466 | -- subprograms. | |
07fc65c4 GB |
2467 | |
2468 | -- Do not do this test if errors have been detected, because in some | |
2469 | -- error cases, this code blows up, and we don't need it anyway if | |
2470 | -- there have been errors, since we won't get to the linker anyway. | |
2471 | ||
82c80734 RD |
2472 | if Comes_From_Source (Body_Id) |
2473 | and then Serious_Errors_Detected = 0 | |
2474 | then | |
07fc65c4 GB |
2475 | P_Ent := Body_Id; |
2476 | loop | |
2477 | P_Ent := Scope (P_Ent); | |
2478 | exit when No (P_Ent) or else P_Ent = Standard_Standard; | |
2479 | ||
fbf5a39b | 2480 | if Is_Subprogram (P_Ent) then |
07fc65c4 GB |
2481 | Set_Is_Inlined (P_Ent, False); |
2482 | ||
2483 | if Comes_From_Source (P_Ent) | |
07fc65c4 GB |
2484 | and then Has_Pragma_Inline (P_Ent) |
2485 | then | |
fbf5a39b AC |
2486 | Cannot_Inline |
2487 | ("cannot inline& (nested subprogram)?", | |
2488 | N, P_Ent); | |
07fc65c4 GB |
2489 | end if; |
2490 | end if; | |
2491 | end loop; | |
2492 | end if; | |
2493 | ||
e660dbf7 JM |
2494 | Check_Inline_Pragma (Spec_Id); |
2495 | ||
701b7fbb RD |
2496 | -- Deal with special case of a fully private operation in the body of |
2497 | -- the protected type. We must create a declaration for the subprogram, | |
2498 | -- in order to attach the protected subprogram that will be used in | |
2499 | -- internal calls. We exclude compiler generated bodies from the | |
2500 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 2501 | |
996ae0b0 RK |
2502 | if No (Spec_Id) |
2503 | and then Comes_From_Source (N) | |
2504 | and then Is_Protected_Type (Current_Scope) | |
2505 | then | |
47bfea3a | 2506 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 2507 | end if; |
996ae0b0 | 2508 | |
5334d18f | 2509 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 2510 | |
701b7fbb | 2511 | if Present (Spec_Id) then |
996ae0b0 | 2512 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 2513 | Verify_Overriding_Indicator; |
5d37ba92 ES |
2514 | |
2515 | -- In general, the spec will be frozen when we start analyzing the | |
2516 | -- body. However, for internally generated operations, such as | |
2517 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
2518 | -- results, the spec may not have been frozen by the time we expand |
2519 | -- the freeze actions that include the bodies. In particular, extra | |
2520 | -- formals for accessibility or for return-in-place may need to be | |
2521 | -- generated. Freeze nodes, if any, are inserted before the current | |
2522 | -- body. These freeze actions are also needed in ASIS mode to enable | |
2523 | -- the proper back-annotations. | |
5d37ba92 ES |
2524 | |
2525 | if not Is_Frozen (Spec_Id) | |
7134062a | 2526 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
2527 | then |
2528 | -- Force the generation of its freezing node to ensure proper | |
2529 | -- management of access types in the backend. | |
2530 | ||
2531 | -- This is definitely needed for some cases, but it is not clear | |
2532 | -- why, to be investigated further??? | |
2533 | ||
2534 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 2535 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 2536 | end if; |
996ae0b0 RK |
2537 | end if; |
2538 | ||
a5d83d61 AC |
2539 | -- Mark presence of postcondition procedure in current scope and mark |
2540 | -- the procedure itself as needing debug info. The latter is important | |
2541 | -- when analyzing decision coverage (for example, for MC/DC coverage). | |
7ca78bba | 2542 | |
0dabde3a ES |
2543 | if Chars (Body_Id) = Name_uPostconditions then |
2544 | Set_Has_Postconditions (Current_Scope); | |
a5d83d61 | 2545 | Set_Debug_Info_Needed (Body_Id); |
0dabde3a ES |
2546 | end if; |
2547 | ||
996ae0b0 RK |
2548 | -- Place subprogram on scope stack, and make formals visible. If there |
2549 | -- is a spec, the visible entity remains that of the spec. | |
2550 | ||
2551 | if Present (Spec_Id) then | |
07fc65c4 | 2552 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
2553 | |
2554 | if Is_Child_Unit (Spec_Id) then | |
2555 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
2556 | end if; | |
2557 | ||
fbf5a39b AC |
2558 | if Style_Check then |
2559 | Style.Check_Identifier (Body_Id, Spec_Id); | |
2560 | end if; | |
996ae0b0 RK |
2561 | |
2562 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2563 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2564 | ||
f937473f | 2565 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 2566 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
996ae0b0 | 2567 | return; |
21d27997 | 2568 | |
996ae0b0 RK |
2569 | else |
2570 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
2571 | Set_Has_Completion (Spec_Id); | |
2572 | ||
2573 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 2574 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
2575 | end if; |
2576 | ||
2577 | -- If this is a body generated for a renaming, do not check for | |
2578 | -- full conformance. The check is redundant, because the spec of | |
2579 | -- the body is a copy of the spec in the renaming declaration, | |
2580 | -- and the test can lead to spurious errors on nested defaults. | |
2581 | ||
2582 | if Present (Spec_Decl) | |
996ae0b0 | 2583 | and then not Comes_From_Source (N) |
93a81b02 GB |
2584 | and then |
2585 | (Nkind (Original_Node (Spec_Decl)) = | |
d2f97d3e GB |
2586 | N_Subprogram_Renaming_Declaration |
2587 | or else (Present (Corresponding_Body (Spec_Decl)) | |
2588 | and then | |
2589 | Nkind (Unit_Declaration_Node | |
2590 | (Corresponding_Body (Spec_Decl))) = | |
2591 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
2592 | then |
2593 | Conformant := True; | |
cabe9abc AC |
2594 | |
2595 | -- Conversely, the spec may have been generated for specless body | |
2596 | -- with an inline pragma. | |
2597 | ||
2598 | elsif Comes_From_Source (N) | |
2599 | and then not Comes_From_Source (Spec_Id) | |
2600 | and then Has_Pragma_Inline (Spec_Id) | |
2601 | then | |
2602 | Conformant := True; | |
76a69663 | 2603 | |
996ae0b0 RK |
2604 | else |
2605 | Check_Conformance | |
2606 | (Body_Id, Spec_Id, | |
76a69663 | 2607 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
2608 | end if; |
2609 | ||
2610 | -- If the body is not fully conformant, we have to decide if we | |
2611 | -- should analyze it or not. If it has a really messed up profile | |
2612 | -- then we probably should not analyze it, since we will get too | |
2613 | -- many bogus messages. | |
2614 | ||
2615 | -- Our decision is to go ahead in the non-fully conformant case | |
2616 | -- only if it is at least mode conformant with the spec. Note | |
2617 | -- that the call to Check_Fully_Conformant has issued the proper | |
2618 | -- error messages to complain about the lack of conformance. | |
2619 | ||
2620 | if not Conformant | |
2621 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
2622 | then | |
2623 | return; | |
2624 | end if; | |
2625 | end if; | |
2626 | ||
996ae0b0 | 2627 | if Spec_Id /= Body_Id then |
fbf5a39b | 2628 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
2629 | end if; |
2630 | ||
2631 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
2632 | Set_Corresponding_Spec (N, Spec_Id); | |
758c442c | 2633 | |
5d37ba92 ES |
2634 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
2635 | -- of a concurrent type, the type of the first parameter has been | |
2636 | -- replaced with the corresponding record, which is the proper | |
2637 | -- run-time structure to use. However, within the body there may | |
2638 | -- be uses of the formals that depend on primitive operations | |
2639 | -- of the type (in particular calls in prefixed form) for which | |
2640 | -- we need the original concurrent type. The operation may have | |
2641 | -- several controlling formals, so the replacement must be done | |
2642 | -- for all of them. | |
758c442c GD |
2643 | |
2644 | if Comes_From_Source (Spec_Id) | |
2645 | and then Present (First_Entity (Spec_Id)) | |
2646 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
2647 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
5d37ba92 | 2648 | and then |
ce2b6ba5 | 2649 | Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
5d37ba92 ES |
2650 | and then |
2651 | Present | |
21d27997 RD |
2652 | (Corresponding_Concurrent_Type |
2653 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 2654 | then |
5d37ba92 ES |
2655 | declare |
2656 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
2657 | Form : Entity_Id; | |
2658 | ||
2659 | begin | |
2660 | Form := First_Formal (Spec_Id); | |
2661 | while Present (Form) loop | |
2662 | if Etype (Form) = Typ then | |
2663 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
2664 | end if; | |
2665 | ||
2666 | Next_Formal (Form); | |
2667 | end loop; | |
2668 | end; | |
758c442c GD |
2669 | end if; |
2670 | ||
21d27997 RD |
2671 | -- Make the formals visible, and place subprogram on scope stack. |
2672 | -- This is also the point at which we set Last_Real_Spec_Entity | |
2673 | -- to mark the entities which will not be moved to the body. | |
758c442c | 2674 | |
996ae0b0 | 2675 | Install_Formals (Spec_Id); |
21d27997 | 2676 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
0a36105d | 2677 | Push_Scope (Spec_Id); |
996ae0b0 RK |
2678 | |
2679 | -- Make sure that the subprogram is immediately visible. For | |
2680 | -- child units that have no separate spec this is indispensable. | |
2681 | -- Otherwise it is safe albeit redundant. | |
2682 | ||
2683 | Set_Is_Immediately_Visible (Spec_Id); | |
2684 | end if; | |
2685 | ||
2686 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
2687 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
2688 | Set_Scope (Body_Id, Scope (Spec_Id)); | |
ec4867fa | 2689 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
996ae0b0 RK |
2690 | |
2691 | -- Case of subprogram body with no previous spec | |
2692 | ||
2693 | else | |
3e5daac4 AC |
2694 | -- Check for style warning required |
2695 | ||
996ae0b0 | 2696 | if Style_Check |
3e5daac4 AC |
2697 | |
2698 | -- Only apply check for source level subprograms for which checks | |
2699 | -- have not been suppressed. | |
2700 | ||
996ae0b0 RK |
2701 | and then Comes_From_Source (Body_Id) |
2702 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
2703 | |
2704 | -- No warnings within an instance | |
2705 | ||
996ae0b0 | 2706 | and then not In_Instance |
3e5daac4 | 2707 | |
b0186f71 | 2708 | -- No warnings for expression functions |
3e5daac4 | 2709 | |
b0186f71 | 2710 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
2711 | then |
2712 | Style.Body_With_No_Spec (N); | |
2713 | end if; | |
2714 | ||
2715 | New_Overloaded_Entity (Body_Id); | |
2716 | ||
2717 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
2718 | Set_Acts_As_Spec (N); | |
2719 | Generate_Definition (Body_Id); | |
dac3bede | 2720 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
fbf5a39b AC |
2721 | Generate_Reference |
2722 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 2723 | Install_Formals (Body_Id); |
0a36105d | 2724 | Push_Scope (Body_Id); |
996ae0b0 | 2725 | end if; |
dbe36d67 AC |
2726 | |
2727 | -- For stubs and bodies with no previous spec, generate references to | |
2728 | -- formals. | |
2729 | ||
2730 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
2731 | end if; |
2732 | ||
76a69663 ES |
2733 | -- If the return type is an anonymous access type whose designated type |
2734 | -- is the limited view of a class-wide type and the non-limited view is | |
2735 | -- available, update the return type accordingly. | |
ec4867fa | 2736 | |
0791fbe9 | 2737 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
2738 | and then Comes_From_Source (N) |
2739 | then | |
2740 | declare | |
ec4867fa | 2741 | Etyp : Entity_Id; |
0a36105d | 2742 | Rtyp : Entity_Id; |
ec4867fa ES |
2743 | |
2744 | begin | |
0a36105d JM |
2745 | Rtyp := Etype (Current_Scope); |
2746 | ||
2747 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
2748 | Etyp := Directly_Designated_Type (Rtyp); | |
2749 | ||
2750 | if Is_Class_Wide_Type (Etyp) | |
2751 | and then From_With_Type (Etyp) | |
2752 | then | |
2753 | Set_Directly_Designated_Type | |
2754 | (Etype (Current_Scope), Available_View (Etyp)); | |
2755 | end if; | |
2756 | end if; | |
ec4867fa ES |
2757 | end; |
2758 | end if; | |
2759 | ||
996ae0b0 RK |
2760 | -- If this is the proper body of a stub, we must verify that the stub |
2761 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 2762 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
2763 | -- only required for subprograms that come from source. |
2764 | ||
2765 | if Nkind (Parent (N)) = N_Subunit | |
2766 | and then Comes_From_Source (N) | |
2767 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
2768 | and then Nkind (Corresponding_Stub (Parent (N))) = |
2769 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
2770 | then |
2771 | declare | |
fbf5a39b AC |
2772 | Old_Id : constant Entity_Id := |
2773 | Defining_Entity | |
2774 | (Specification (Corresponding_Stub (Parent (N)))); | |
2775 | ||
996ae0b0 | 2776 | Conformant : Boolean := False; |
996ae0b0 RK |
2777 | |
2778 | begin | |
2779 | if No (Spec_Id) then | |
2780 | Check_Fully_Conformant (Body_Id, Old_Id); | |
2781 | ||
2782 | else | |
2783 | Check_Conformance | |
2784 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
2785 | ||
2786 | if not Conformant then | |
2787 | ||
dbe36d67 AC |
2788 | -- The stub was taken to be a new declaration. Indicate that |
2789 | -- it lacks a body. | |
996ae0b0 RK |
2790 | |
2791 | Set_Has_Completion (Old_Id, False); | |
2792 | end if; | |
2793 | end if; | |
2794 | end; | |
2795 | end if; | |
2796 | ||
2797 | Set_Has_Completion (Body_Id); | |
2798 | Check_Eliminated (Body_Id); | |
2799 | ||
2800 | if Nkind (N) = N_Subprogram_Body_Stub then | |
2801 | return; | |
2802 | ||
ec4867fa | 2803 | elsif Present (Spec_Id) |
996ae0b0 | 2804 | and then Expander_Active |
e660dbf7 | 2805 | and then |
800621e0 | 2806 | (Has_Pragma_Inline_Always (Spec_Id) |
e660dbf7 | 2807 | or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining)) |
996ae0b0 | 2808 | then |
e660dbf7 | 2809 | Build_Body_To_Inline (N, Spec_Id); |
996ae0b0 RK |
2810 | end if; |
2811 | ||
0ab80019 | 2812 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 2813 | -- of the specification we have to install the private withed units. |
21d27997 | 2814 | -- This holds for child units as well. |
9bc856dd AC |
2815 | |
2816 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 2817 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
2818 | then |
2819 | Install_Private_With_Clauses (Body_Id); | |
2820 | end if; | |
2821 | ||
ec4867fa ES |
2822 | Check_Anonymous_Return; |
2823 | ||
fdce4bb7 JM |
2824 | -- Set the Protected_Formal field of each extra formal of the protected |
2825 | -- subprogram to reference the corresponding extra formal of the | |
2826 | -- subprogram that implements it. For regular formals this occurs when | |
2827 | -- the protected subprogram's declaration is expanded, but the extra | |
2828 | -- formals don't get created until the subprogram is frozen. We need to | |
2829 | -- do this before analyzing the protected subprogram's body so that any | |
2830 | -- references to the original subprogram's extra formals will be changed | |
2831 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
2832 | ||
2833 | if Present (Spec_Id) | |
2834 | and then Is_Protected_Type (Scope (Spec_Id)) | |
2835 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
2836 | then | |
2837 | declare | |
2838 | Impl_Subp : constant Entity_Id := | |
2839 | Protected_Body_Subprogram (Spec_Id); | |
2840 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
2841 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
2842 | begin |
2843 | while Present (Prot_Ext_Formal) loop | |
2844 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 2845 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
2846 | Next_Formal_With_Extras (Prot_Ext_Formal); |
2847 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
2848 | end loop; | |
2849 | end; | |
2850 | end if; | |
2851 | ||
0868e09c | 2852 | -- Now we can go on to analyze the body |
996ae0b0 RK |
2853 | |
2854 | HSS := Handled_Statement_Sequence (N); | |
2855 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 2856 | |
483361a6 AC |
2857 | -- Deal with preconditions and postconditions. In formal verification |
2858 | -- mode, we keep pre- and postconditions attached to entities rather | |
2859 | -- than inserted in the code, in order to facilitate a distinct | |
2860 | -- treatment for them. | |
21d27997 | 2861 | |
56812278 | 2862 | if not Alfa_Mode then |
483361a6 AC |
2863 | Process_PPCs (N, Spec_Id, Body_Id); |
2864 | end if; | |
21d27997 | 2865 | |
f3d0f304 | 2866 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
2867 | -- for discriminals and privals and finally a declaration for the entry |
2868 | -- family index (if applicable). This form of early expansion is done | |
2869 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 AC |
2870 | -- references entities which were created during regular expansion. The |
2871 | -- body may be the rewritting of an expression function, and we need to | |
2872 | -- verify that the original node is in the source. | |
21d27997 | 2873 | |
da94696d | 2874 | if Full_Expander_Active |
13a0b1e8 | 2875 | and then Comes_From_Source (Original_Node (N)) |
21d27997 RD |
2876 | and then Present (Prot_Typ) |
2877 | and then Present (Spec_Id) | |
2878 | and then not Is_Eliminated (Spec_Id) | |
2879 | then | |
2880 | Install_Private_Data_Declarations | |
2881 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
2882 | end if; | |
2883 | ||
5dcab3ca AC |
2884 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
2885 | -- may now appear in parameter and result profiles. Since the analysis | |
2886 | -- of a subprogram body may use the parameter and result profile of the | |
2887 | -- spec, swap any limited views with their non-limited counterpart. | |
2888 | ||
2889 | if Ada_Version >= Ada_2012 then | |
2890 | Exchange_Limited_Views (Spec_Id); | |
2891 | end if; | |
2892 | ||
21d27997 RD |
2893 | -- Analyze the declarations (this call will analyze the precondition |
2894 | -- Check pragmas we prepended to the list, as well as the declaration | |
2895 | -- of the _Postconditions procedure). | |
2896 | ||
996ae0b0 | 2897 | Analyze_Declarations (Declarations (N)); |
21d27997 RD |
2898 | |
2899 | -- Check completion, and analyze the statements | |
2900 | ||
996ae0b0 | 2901 | Check_Completion; |
33931112 | 2902 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 2903 | Analyze (HSS); |
21d27997 RD |
2904 | |
2905 | -- Deal with end of scope processing for the body | |
2906 | ||
07fc65c4 | 2907 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
2908 | End_Scope; |
2909 | Check_Subprogram_Order (N); | |
c37bb106 | 2910 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
2911 | |
2912 | -- If we have a separate spec, then the analysis of the declarations | |
2913 | -- caused the entities in the body to be chained to the spec id, but | |
2914 | -- we want them chained to the body id. Only the formal parameters | |
2915 | -- end up chained to the spec id in this case. | |
2916 | ||
2917 | if Present (Spec_Id) then | |
2918 | ||
d39d6bb8 | 2919 | -- We must conform to the categorization of our spec |
996ae0b0 | 2920 | |
d39d6bb8 | 2921 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 2922 | |
d39d6bb8 RD |
2923 | -- And if this is a child unit, the parent units must conform |
2924 | ||
2925 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
2926 | Validate_Categorization_Dependency |
2927 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
2928 | end if; | |
2929 | ||
21d27997 RD |
2930 | -- Here is where we move entities from the spec to the body |
2931 | ||
2932 | -- Case where there are entities that stay with the spec | |
2933 | ||
2934 | if Present (Last_Real_Spec_Entity) then | |
2935 | ||
dbe36d67 AC |
2936 | -- No body entities (happens when the only real spec entities come |
2937 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
2938 | |
2939 | if No (Last_Entity (Body_Id)) then | |
2940 | Set_First_Entity | |
2941 | (Body_Id, Next_Entity (Last_Real_Spec_Entity)); | |
2942 | ||
2943 | -- Body entities present (formals), so chain stuff past them | |
2944 | ||
2945 | else | |
2946 | Set_Next_Entity | |
2947 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
2948 | end if; | |
2949 | ||
2950 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 2951 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
2952 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
2953 | ||
dbe36d67 AC |
2954 | -- Case where there are no spec entities, in this case there can be |
2955 | -- no body entities either, so just move everything. | |
996ae0b0 RK |
2956 | |
2957 | else | |
21d27997 | 2958 | pragma Assert (No (Last_Entity (Body_Id))); |
996ae0b0 RK |
2959 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
2960 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
2961 | Set_First_Entity (Spec_Id, Empty); | |
2962 | Set_Last_Entity (Spec_Id, Empty); | |
2963 | end if; | |
2964 | end if; | |
2965 | ||
7665e4bd | 2966 | Check_Missing_Return; |
996ae0b0 | 2967 | |
82c80734 | 2968 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
2969 | -- the body of the procedure. But first we deal with a special case |
2970 | -- where we want to modify this check. If the body of the subprogram | |
2971 | -- starts with a raise statement or its equivalent, or if the body | |
2972 | -- consists entirely of a null statement, then it is pretty obvious | |
2973 | -- that it is OK to not reference the parameters. For example, this | |
2974 | -- might be the following common idiom for a stubbed function: | |
82c80734 RD |
2975 | -- statement of the procedure raises an exception. In particular this |
2976 | -- deals with the common idiom of a stubbed function, which might | |
dbe36d67 | 2977 | -- appear as something like: |
fbf5a39b AC |
2978 | |
2979 | -- function F (A : Integer) return Some_Type; | |
2980 | -- X : Some_Type; | |
2981 | -- begin | |
2982 | -- raise Program_Error; | |
2983 | -- return X; | |
2984 | -- end F; | |
2985 | ||
76a69663 ES |
2986 | -- Here the purpose of X is simply to satisfy the annoying requirement |
2987 | -- in Ada that there be at least one return, and we certainly do not | |
2988 | -- want to go posting warnings on X that it is not initialized! On | |
2989 | -- the other hand, if X is entirely unreferenced that should still | |
2990 | -- get a warning. | |
2991 | ||
2992 | -- What we do is to detect these cases, and if we find them, flag the | |
2993 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
2994 | -- suppress unwanted warnings. For the case of the function stub above | |
2995 | -- we have a special test to set X as apparently assigned to suppress | |
2996 | -- the warning. | |
996ae0b0 RK |
2997 | |
2998 | declare | |
800621e0 | 2999 | Stm : Node_Id; |
996ae0b0 RK |
3000 | |
3001 | begin | |
0a36105d JM |
3002 | -- Skip initial labels (for one thing this occurs when we are in |
3003 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
3004 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 3005 | |
800621e0 | 3006 | Stm := First (Statements (HSS)); |
0a36105d JM |
3007 | while Nkind (Stm) = N_Label |
3008 | or else Nkind (Stm) in N_Push_xxx_Label | |
3009 | loop | |
996ae0b0 | 3010 | Next (Stm); |
0a36105d | 3011 | end loop; |
996ae0b0 | 3012 | |
fbf5a39b AC |
3013 | -- Do the test on the original statement before expansion |
3014 | ||
3015 | declare | |
3016 | Ostm : constant Node_Id := Original_Node (Stm); | |
3017 | ||
3018 | begin | |
76a69663 | 3019 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
3020 | |
3021 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
3022 | Set_Trivial_Subprogram (Stm); |
3023 | ||
f3d57416 | 3024 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
3025 | |
3026 | elsif Nkind (Stm) = N_Null_Statement | |
3027 | and then Comes_From_Source (Stm) | |
3028 | and then No (Next (Stm)) | |
3029 | then | |
3030 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
3031 | |
3032 | -- Check for explicit call cases which likely raise an exception | |
3033 | ||
3034 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
3035 | if Is_Entity_Name (Name (Ostm)) then | |
3036 | declare | |
3037 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
3038 | ||
3039 | begin | |
3040 | -- If the procedure is marked No_Return, then likely it | |
3041 | -- raises an exception, but in any case it is not coming | |
76a69663 | 3042 | -- back here, so turn on the flag. |
fbf5a39b | 3043 | |
f46faa08 AC |
3044 | if Present (Ent) |
3045 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
3046 | and then No_Return (Ent) |
3047 | then | |
76a69663 | 3048 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
3049 | end if; |
3050 | end; | |
3051 | end if; | |
3052 | end if; | |
3053 | end; | |
996ae0b0 RK |
3054 | end; |
3055 | ||
3056 | -- Check for variables that are never modified | |
3057 | ||
3058 | declare | |
3059 | E1, E2 : Entity_Id; | |
3060 | ||
3061 | begin | |
fbf5a39b | 3062 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
3063 | -- flags from out parameters to the corresponding entities in the |
3064 | -- body. The reason we do that is we want to post error flags on | |
3065 | -- the body entities, not the spec entities. | |
3066 | ||
3067 | if Present (Spec_Id) then | |
3068 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
3069 | while Present (E1) loop |
3070 | if Ekind (E1) = E_Out_Parameter then | |
3071 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 3072 | while Present (E2) loop |
996ae0b0 RK |
3073 | exit when Chars (E1) = Chars (E2); |
3074 | Next_Entity (E2); | |
3075 | end loop; | |
3076 | ||
fbf5a39b AC |
3077 | if Present (E2) then |
3078 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
3079 | end if; | |
996ae0b0 RK |
3080 | end if; |
3081 | ||
3082 | Next_Entity (E1); | |
3083 | end loop; | |
3084 | end if; | |
3085 | ||
0868e09c RD |
3086 | -- Check references in body unless it was deleted. Note that the |
3087 | -- check of Body_Deleted here is not just for efficiency, it is | |
3088 | -- necessary to avoid junk warnings on formal parameters. | |
3089 | ||
3090 | if not Body_Deleted then | |
3091 | Check_References (Body_Id); | |
3092 | end if; | |
996ae0b0 | 3093 | end; |
b1b543d2 | 3094 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 RK |
3095 | |
3096 | ------------------------------------ | |
3097 | -- Analyze_Subprogram_Declaration -- | |
3098 | ------------------------------------ | |
3099 | ||
3100 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
5d5832bc | 3101 | Loc : constant Source_Ptr := Sloc (N); |
0f1a6a0b | 3102 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc AC |
3103 | Designator : Entity_Id; |
3104 | Form : Node_Id; | |
5d5832bc | 3105 | Null_Body : Node_Id := Empty; |
996ae0b0 RK |
3106 | |
3107 | -- Start of processing for Analyze_Subprogram_Declaration | |
3108 | ||
3109 | begin | |
2ba431e5 | 3110 | -- Null procedures are not allowed in SPARK |
daec8eeb | 3111 | |
fe5d3068 | 3112 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
3113 | and then Null_Present (Specification (N)) |
3114 | then | |
2ba431e5 | 3115 | Check_SPARK_Restriction ("null procedure is not allowed", N); |
daec8eeb YM |
3116 | end if; |
3117 | ||
349ff68f | 3118 | -- For a null procedure, capture the profile before analysis, for |
c159409f AC |
3119 | -- expansion at the freeze point and at each point of call. The body |
3120 | -- will only be used if the procedure has preconditions. In that case | |
3121 | -- the body is analyzed at the freeze point. | |
5d5832bc AC |
3122 | |
3123 | if Nkind (Specification (N)) = N_Procedure_Specification | |
3124 | and then Null_Present (Specification (N)) | |
3125 | and then Expander_Active | |
3126 | then | |
3127 | Null_Body := | |
3128 | Make_Subprogram_Body (Loc, | |
3129 | Specification => | |
3130 | New_Copy_Tree (Specification (N)), | |
349ff68f AC |
3131 | Declarations => |
3132 | New_List, | |
5d5832bc AC |
3133 | Handled_Statement_Sequence => |
3134 | Make_Handled_Sequence_Of_Statements (Loc, | |
3135 | Statements => New_List (Make_Null_Statement (Loc)))); | |
3136 | ||
01957849 | 3137 | -- Create new entities for body and formals |
5d5832bc AC |
3138 | |
3139 | Set_Defining_Unit_Name (Specification (Null_Body), | |
3140 | Make_Defining_Identifier (Loc, Chars (Defining_Entity (N)))); | |
3141 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
3142 | ||
3143 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
3144 | while Present (Form) loop | |
3145 | Set_Defining_Identifier (Form, | |
3146 | Make_Defining_Identifier (Loc, | |
3147 | Chars (Defining_Identifier (Form)))); | |
718deaf1 AC |
3148 | |
3149 | -- Resolve the types of the formals now, because the freeze point | |
3150 | -- may appear in a different context, e.g. an instantiation. | |
3151 | ||
3152 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
3153 | Find_Type (Parameter_Type (Form)); | |
3154 | ||
3155 | elsif | |
3156 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
3157 | then | |
3158 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
3159 | ||
3160 | else | |
3161 | ||
3162 | -- the case of a null procedure with a formal that is an | |
3163 | -- access_to_subprogram type, and that is used as an actual | |
3164 | -- in an instantiation is left to the enthusiastic reader. | |
3165 | ||
3166 | null; | |
3167 | end if; | |
3168 | ||
5d5832bc AC |
3169 | Next (Form); |
3170 | end loop; | |
3171 | ||
3172 | if Is_Protected_Type (Current_Scope) then | |
ed2233dc | 3173 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
5d5832bc AC |
3174 | end if; |
3175 | end if; | |
3176 | ||
beacce02 | 3177 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
5d5832bc | 3178 | Generate_Definition (Designator); |
dac3bede | 3179 | -- ??? why this call, already in Analyze_Subprogram_Specification |
5d5832bc | 3180 | |
b1b543d2 BD |
3181 | if Debug_Flag_C then |
3182 | Write_Str ("==> subprogram spec "); | |
3183 | Write_Name (Chars (Designator)); | |
3184 | Write_Str (" from "); | |
3185 | Write_Location (Sloc (N)); | |
3186 | Write_Eol; | |
3187 | Indent; | |
3188 | end if; | |
3189 | ||
5d5832bc AC |
3190 | if Nkind (Specification (N)) = N_Procedure_Specification |
3191 | and then Null_Present (Specification (N)) | |
3192 | then | |
3193 | Set_Has_Completion (Designator); | |
996ae0b0 | 3194 | |
5d5832bc AC |
3195 | if Present (Null_Body) then |
3196 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); | |
3197 | Set_Body_To_Inline (N, Null_Body); | |
3198 | Set_Is_Inlined (Designator); | |
3199 | end if; | |
3200 | end if; | |
996ae0b0 RK |
3201 | |
3202 | Validate_RCI_Subprogram_Declaration (N); | |
996ae0b0 RK |
3203 | New_Overloaded_Entity (Designator); |
3204 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 3205 | |
6ca063eb AC |
3206 | -- If the type of the first formal of the current subprogram is a |
3207 | -- nongeneric tagged private type, mark the subprogram as being a | |
3208 | -- private primitive. Ditto if this is a function with controlling | |
b7d5e87b AC |
3209 | -- result, and the return type is currently private. In both cases, |
3210 | -- the type of the controlling argument or result must be in the | |
3211 | -- current scope for the operation to be primitive. | |
6ca063eb AC |
3212 | |
3213 | if Has_Controlling_Result (Designator) | |
3214 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 3215 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
3216 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
3217 | then | |
3218 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 3219 | |
6ca063eb | 3220 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
3221 | declare |
3222 | Formal_Typ : constant Entity_Id := | |
3223 | Etype (First_Formal (Designator)); | |
3224 | begin | |
3225 | Set_Is_Private_Primitive (Designator, | |
3226 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 3227 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
3228 | and then Is_Private_Type (Formal_Typ) |
3229 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
3230 | end; | |
3231 | end if; | |
3232 | ||
ec4867fa ES |
3233 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
3234 | -- or null. | |
3235 | ||
0791fbe9 | 3236 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
3237 | and then Comes_From_Source (N) |
3238 | and then Is_Dispatching_Operation (Designator) | |
3239 | then | |
3240 | declare | |
3241 | E : Entity_Id; | |
3242 | Etyp : Entity_Id; | |
3243 | ||
3244 | begin | |
3245 | if Has_Controlling_Result (Designator) then | |
3246 | Etyp := Etype (Designator); | |
3247 | ||
3248 | else | |
3249 | E := First_Entity (Designator); | |
3250 | while Present (E) | |
3251 | and then Is_Formal (E) | |
3252 | and then not Is_Controlling_Formal (E) | |
3253 | loop | |
3254 | Next_Entity (E); | |
3255 | end loop; | |
3256 | ||
3257 | Etyp := Etype (E); | |
3258 | end if; | |
3259 | ||
3260 | if Is_Access_Type (Etyp) then | |
3261 | Etyp := Directly_Designated_Type (Etyp); | |
3262 | end if; | |
3263 | ||
3264 | if Is_Interface (Etyp) | |
f937473f | 3265 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa ES |
3266 | and then not (Ekind (Designator) = E_Procedure |
3267 | and then Null_Present (Specification (N))) | |
3268 | then | |
3269 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
3270 | |
3271 | -- Specialize error message based on procedures vs. functions, | |
3272 | -- since functions can't be null subprograms. | |
3273 | ||
3274 | if Ekind (Designator) = E_Procedure then | |
3275 | Error_Msg_N | |
3276 | ("interface procedure % must be abstract or null", N); | |
3277 | else | |
3278 | Error_Msg_N ("interface function % must be abstract", N); | |
3279 | end if; | |
ec4867fa ES |
3280 | end if; |
3281 | end; | |
3282 | end if; | |
3283 | ||
fbf5a39b AC |
3284 | -- What is the following code for, it used to be |
3285 | ||
3286 | -- ??? Set_Suppress_Elaboration_Checks | |
3287 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
3288 | ||
3289 | -- The following seems equivalent, but a bit dubious | |
3290 | ||
3291 | if Elaboration_Checks_Suppressed (Designator) then | |
3292 | Set_Kill_Elaboration_Checks (Designator); | |
3293 | end if; | |
996ae0b0 RK |
3294 | |
3295 | if Scop /= Standard_Standard | |
3296 | and then not Is_Child_Unit (Designator) | |
3297 | then | |
fbf5a39b | 3298 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 | 3299 | else |
e895b435 | 3300 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 3301 | |
0a36105d | 3302 | Push_Scope (Designator); |
996ae0b0 RK |
3303 | Set_Categorization_From_Pragmas (N); |
3304 | Validate_Categorization_Dependency (N, Designator); | |
3305 | Pop_Scope; | |
3306 | end if; | |
3307 | ||
3308 | -- For a compilation unit, set body required. This flag will only be | |
3309 | -- reset if a valid Import or Interface pragma is processed later on. | |
3310 | ||
3311 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
3312 | Set_Body_Required (Parent (N), True); | |
758c442c | 3313 | |
0791fbe9 | 3314 | if Ada_Version >= Ada_2005 |
758c442c GD |
3315 | and then Nkind (Specification (N)) = N_Procedure_Specification |
3316 | and then Null_Present (Specification (N)) | |
3317 | then | |
3318 | Error_Msg_N | |
3319 | ("null procedure cannot be declared at library level", N); | |
3320 | end if; | |
996ae0b0 RK |
3321 | end if; |
3322 | ||
fbf5a39b | 3323 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 3324 | Check_Eliminated (Designator); |
fbf5a39b | 3325 | |
b1b543d2 BD |
3326 | if Debug_Flag_C then |
3327 | Outdent; | |
3328 | Write_Str ("<== subprogram spec "); | |
3329 | Write_Name (Chars (Designator)); | |
3330 | Write_Str (" from "); | |
3331 | Write_Location (Sloc (N)); | |
3332 | Write_Eol; | |
3333 | end if; | |
0f1a6a0b | 3334 | |
1a265e78 AC |
3335 | if Is_Protected_Type (Current_Scope) then |
3336 | ||
3337 | -- Indicate that this is a protected operation, because it may be | |
3338 | -- used in subsequent declarations within the protected type. | |
3339 | ||
3340 | Set_Convention (Designator, Convention_Protected); | |
3341 | end if; | |
3342 | ||
beacce02 | 3343 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
3344 | |
3345 | if Has_Aspects (N) then | |
3346 | Analyze_Aspect_Specifications (N, Designator); | |
3347 | end if; | |
996ae0b0 RK |
3348 | end Analyze_Subprogram_Declaration; |
3349 | ||
fbf5a39b AC |
3350 | -------------------------------------- |
3351 | -- Analyze_Subprogram_Specification -- | |
3352 | -------------------------------------- | |
3353 | ||
3354 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
3355 | -- declaration). This procedure is called to analyze the specification in | |
3356 | -- both subprogram bodies and subprogram declarations (specs). | |
3357 | ||
3358 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
3359 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 3360 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 3361 | |
758c442c GD |
3362 | -- Start of processing for Analyze_Subprogram_Specification |
3363 | ||
fbf5a39b | 3364 | begin |
2ba431e5 | 3365 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 3366 | |
db72f10a AC |
3367 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
3368 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
3369 | then | |
2ba431e5 | 3370 | Check_SPARK_Restriction ("user-defined operator is not allowed", N); |
38171f43 AC |
3371 | end if; |
3372 | ||
3373 | -- Proceed with analysis | |
3374 | ||
fbf5a39b | 3375 | Generate_Definition (Designator); |
dac3bede | 3376 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
fbf5a39b AC |
3377 | |
3378 | if Nkind (N) = N_Function_Specification then | |
3379 | Set_Ekind (Designator, E_Function); | |
3380 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
3381 | else |
3382 | Set_Ekind (Designator, E_Procedure); | |
3383 | Set_Etype (Designator, Standard_Void_Type); | |
3384 | end if; | |
3385 | ||
800621e0 | 3386 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
3387 | |
3388 | Set_Scope (Designator, Current_Scope); | |
3389 | ||
fbf5a39b | 3390 | if Present (Formals) then |
0a36105d | 3391 | Push_Scope (Designator); |
fbf5a39b | 3392 | Process_Formals (Formals, N); |
758c442c | 3393 | |
a38ff9b1 ES |
3394 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
3395 | -- inherited interface operation, and the controlling type is | |
3396 | -- a synchronized type, replace the type with its corresponding | |
3397 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
3398 | -- Same processing for an access parameter whose designated type is |
3399 | -- derived from a synchronized interface. | |
758c442c | 3400 | |
0791fbe9 | 3401 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
3402 | declare |
3403 | Formal : Entity_Id; | |
3404 | Formal_Typ : Entity_Id; | |
3405 | Rec_Typ : Entity_Id; | |
69cb258c | 3406 | Desig_Typ : Entity_Id; |
0a36105d | 3407 | |
d44202ba HK |
3408 | begin |
3409 | Formal := First_Formal (Designator); | |
3410 | while Present (Formal) loop | |
3411 | Formal_Typ := Etype (Formal); | |
0a36105d | 3412 | |
d44202ba HK |
3413 | if Is_Concurrent_Type (Formal_Typ) |
3414 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
3415 | then | |
3416 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
3417 | ||
3418 | if Present (Interfaces (Rec_Typ)) then | |
3419 | Set_Etype (Formal, Rec_Typ); | |
3420 | end if; | |
69cb258c AC |
3421 | |
3422 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
3423 | Desig_Typ := Designated_Type (Formal_Typ); | |
3424 | ||
3425 | if Is_Concurrent_Type (Desig_Typ) | |
3426 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
3427 | then | |
3428 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
3429 | ||
3430 | if Present (Interfaces (Rec_Typ)) then | |
3431 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
3432 | end if; | |
3433 | end if; | |
d44202ba HK |
3434 | end if; |
3435 | ||
3436 | Next_Formal (Formal); | |
3437 | end loop; | |
3438 | end; | |
758c442c GD |
3439 | end if; |
3440 | ||
fbf5a39b | 3441 | End_Scope; |
82c80734 | 3442 | |
b66c3ff4 AC |
3443 | -- The subprogram scope is pushed and popped around the processing of |
3444 | -- the return type for consistency with call above to Process_Formals | |
3445 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
3446 | -- itype created for the return type will be associated with the proper | |
3447 | -- scope. | |
3448 | ||
82c80734 | 3449 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 3450 | Push_Scope (Designator); |
82c80734 | 3451 | Analyze_Return_Type (N); |
b66c3ff4 | 3452 | End_Scope; |
fbf5a39b AC |
3453 | end if; |
3454 | ||
e606088a AC |
3455 | -- Function case |
3456 | ||
fbf5a39b | 3457 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
3458 | |
3459 | -- Deal with operator symbol case | |
3460 | ||
fbf5a39b AC |
3461 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
3462 | Valid_Operator_Definition (Designator); | |
3463 | end if; | |
3464 | ||
3465 | May_Need_Actuals (Designator); | |
3466 | ||
fe63b1b1 ES |
3467 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
3468 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
3469 | -- declarations, where abstractness is inherited, and to subprogram |
3470 | -- bodies generated for stream operations, which become renamings as | |
3471 | -- bodies. | |
2bfb1b72 | 3472 | |
fe63b1b1 ES |
3473 | -- In case of primitives associated with abstract interface types |
3474 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 3475 | |
1adaea16 AC |
3476 | if not Nkind_In (Original_Node (Parent (N)), |
3477 | N_Subprogram_Renaming_Declaration, | |
3478 | N_Abstract_Subprogram_Declaration, | |
3479 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 3480 | then |
2e79de51 AC |
3481 | if Is_Abstract_Type (Etype (Designator)) |
3482 | and then not Is_Interface (Etype (Designator)) | |
3483 | then | |
3484 | Error_Msg_N | |
3485 | ("function that returns abstract type must be abstract", N); | |
3486 | ||
e606088a | 3487 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
3488 | -- access result whose designated type is abstract. |
3489 | ||
3490 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
3491 | and then | |
3492 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
3493 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 3494 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
3495 | then |
3496 | Error_Msg_N ("function whose access result designates " | |
3497 | & "abstract type must be abstract", N); | |
3498 | end if; | |
fbf5a39b AC |
3499 | end if; |
3500 | end if; | |
3501 | ||
3502 | return Designator; | |
3503 | end Analyze_Subprogram_Specification; | |
3504 | ||
996ae0b0 RK |
3505 | -------------------------- |
3506 | -- Build_Body_To_Inline -- | |
3507 | -------------------------- | |
3508 | ||
d05ef0ab | 3509 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id) is |
f937473f | 3510 | Decl : constant Node_Id := Unit_Declaration_Node (Subp); |
996ae0b0 RK |
3511 | Original_Body : Node_Id; |
3512 | Body_To_Analyze : Node_Id; | |
3513 | Max_Size : constant := 10; | |
3514 | Stat_Count : Integer := 0; | |
3515 | ||
3516 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
e895b435 | 3517 | -- Check for declarations that make inlining not worthwhile |
996ae0b0 RK |
3518 | |
3519 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
82c80734 RD |
3520 | -- Check for statements that make inlining not worthwhile: any tasking |
3521 | -- statement, nested at any level. Keep track of total number of | |
3522 | -- elementary statements, as a measure of acceptable size. | |
996ae0b0 RK |
3523 | |
3524 | function Has_Pending_Instantiation return Boolean; | |
f937473f RD |
3525 | -- If some enclosing body contains instantiations that appear before the |
3526 | -- corresponding generic body, the enclosing body has a freeze node so | |
3527 | -- that it can be elaborated after the generic itself. This might | |
996ae0b0 RK |
3528 | -- conflict with subsequent inlinings, so that it is unsafe to try to |
3529 | -- inline in such a case. | |
3530 | ||
c8ef728f | 3531 | function Has_Single_Return return Boolean; |
f937473f RD |
3532 | -- In general we cannot inline functions that return unconstrained type. |
3533 | -- However, we can handle such functions if all return statements return | |
3534 | -- a local variable that is the only declaration in the body of the | |
3535 | -- function. In that case the call can be replaced by that local | |
3536 | -- variable as is done for other inlined calls. | |
c8ef728f | 3537 | |
fbf5a39b | 3538 | procedure Remove_Pragmas; |
76a69663 ES |
3539 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal |
3540 | -- parameter has no meaning when the body is inlined and the formals | |
3541 | -- are rewritten. Remove it from body to inline. The analysis of the | |
3542 | -- non-inlined body will handle the pragma properly. | |
996ae0b0 | 3543 | |
e895b435 ES |
3544 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean; |
3545 | -- If the body of the subprogram includes a call that returns an | |
3546 | -- unconstrained type, the secondary stack is involved, and it | |
3547 | -- is not worth inlining. | |
3548 | ||
996ae0b0 RK |
3549 | ------------------------------ |
3550 | -- Has_Excluded_Declaration -- | |
3551 | ------------------------------ | |
3552 | ||
3553 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
3554 | D : Node_Id; | |
3555 | ||
fbf5a39b | 3556 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; |
82c80734 RD |
3557 | -- Nested subprograms make a given body ineligible for inlining, but |
3558 | -- we make an exception for instantiations of unchecked conversion. | |
3559 | -- The body has not been analyzed yet, so check the name, and verify | |
3560 | -- that the visible entity with that name is the predefined unit. | |
3561 | ||
3562 | ----------------------------- | |
3563 | -- Is_Unchecked_Conversion -- | |
3564 | ----------------------------- | |
fbf5a39b AC |
3565 | |
3566 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
82c80734 | 3567 | Id : constant Node_Id := Name (D); |
fbf5a39b AC |
3568 | Conv : Entity_Id; |
3569 | ||
3570 | begin | |
3571 | if Nkind (Id) = N_Identifier | |
3572 | and then Chars (Id) = Name_Unchecked_Conversion | |
3573 | then | |
3574 | Conv := Current_Entity (Id); | |
3575 | ||
800621e0 | 3576 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) |
fbf5a39b AC |
3577 | and then Chars (Selector_Name (Id)) = Name_Unchecked_Conversion |
3578 | then | |
3579 | Conv := Current_Entity (Selector_Name (Id)); | |
fbf5a39b AC |
3580 | else |
3581 | return False; | |
3582 | end if; | |
3583 | ||
758c442c GD |
3584 | return Present (Conv) |
3585 | and then Is_Predefined_File_Name | |
3586 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
fbf5a39b AC |
3587 | and then Is_Intrinsic_Subprogram (Conv); |
3588 | end Is_Unchecked_Conversion; | |
3589 | ||
3590 | -- Start of processing for Has_Excluded_Declaration | |
3591 | ||
996ae0b0 RK |
3592 | begin |
3593 | D := First (Decls); | |
996ae0b0 | 3594 | while Present (D) loop |
800621e0 RD |
3595 | if (Nkind (D) = N_Function_Instantiation |
3596 | and then not Is_Unchecked_Conversion (D)) | |
3597 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
3598 | N_Package_Declaration, | |
3599 | N_Package_Instantiation, | |
3600 | N_Subprogram_Body, | |
3601 | N_Procedure_Instantiation, | |
3602 | N_Task_Type_Declaration) | |
996ae0b0 RK |
3603 | then |
3604 | Cannot_Inline | |
fbf5a39b | 3605 | ("cannot inline & (non-allowed declaration)?", D, Subp); |
996ae0b0 RK |
3606 | return True; |
3607 | end if; | |
3608 | ||
3609 | Next (D); | |
3610 | end loop; | |
3611 | ||
3612 | return False; | |
996ae0b0 RK |
3613 | end Has_Excluded_Declaration; |
3614 | ||
3615 | ---------------------------- | |
3616 | -- Has_Excluded_Statement -- | |
3617 | ---------------------------- | |
3618 | ||
3619 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
3620 | S : Node_Id; | |
3621 | E : Node_Id; | |
3622 | ||
3623 | begin | |
3624 | S := First (Stats); | |
996ae0b0 RK |
3625 | while Present (S) loop |
3626 | Stat_Count := Stat_Count + 1; | |
3627 | ||
800621e0 RD |
3628 | if Nkind_In (S, N_Abort_Statement, |
3629 | N_Asynchronous_Select, | |
3630 | N_Conditional_Entry_Call, | |
3631 | N_Delay_Relative_Statement, | |
3632 | N_Delay_Until_Statement, | |
3633 | N_Selective_Accept, | |
3634 | N_Timed_Entry_Call) | |
996ae0b0 RK |
3635 | then |
3636 | Cannot_Inline | |
fbf5a39b | 3637 | ("cannot inline & (non-allowed statement)?", S, Subp); |
996ae0b0 RK |
3638 | return True; |
3639 | ||
3640 | elsif Nkind (S) = N_Block_Statement then | |
3641 | if Present (Declarations (S)) | |
3642 | and then Has_Excluded_Declaration (Declarations (S)) | |
3643 | then | |
3644 | return True; | |
3645 | ||
3646 | elsif Present (Handled_Statement_Sequence (S)) | |
3647 | and then | |
3648 | (Present | |
3649 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
3650 | or else | |
3651 | Has_Excluded_Statement | |
3652 | (Statements (Handled_Statement_Sequence (S)))) | |
3653 | then | |
3654 | return True; | |
3655 | end if; | |
3656 | ||
3657 | elsif Nkind (S) = N_Case_Statement then | |
3658 | E := First (Alternatives (S)); | |
996ae0b0 RK |
3659 | while Present (E) loop |
3660 | if Has_Excluded_Statement (Statements (E)) then | |
3661 | return True; | |
3662 | end if; | |
3663 | ||
3664 | Next (E); | |
3665 | end loop; | |
3666 | ||
3667 | elsif Nkind (S) = N_If_Statement then | |
3668 | if Has_Excluded_Statement (Then_Statements (S)) then | |
3669 | return True; | |
3670 | end if; | |
3671 | ||
3672 | if Present (Elsif_Parts (S)) then | |
3673 | E := First (Elsif_Parts (S)); | |
996ae0b0 RK |
3674 | while Present (E) loop |
3675 | if Has_Excluded_Statement (Then_Statements (E)) then | |
3676 | return True; | |
3677 | end if; | |
3678 | Next (E); | |
3679 | end loop; | |
3680 | end if; | |
3681 | ||
3682 | if Present (Else_Statements (S)) | |
3683 | and then Has_Excluded_Statement (Else_Statements (S)) | |
3684 | then | |
3685 | return True; | |
3686 | end if; | |
3687 | ||
3688 | elsif Nkind (S) = N_Loop_Statement | |
3689 | and then Has_Excluded_Statement (Statements (S)) | |
3690 | then | |
3691 | return True; | |
3e2399ba AC |
3692 | |
3693 | elsif Nkind (S) = N_Extended_Return_Statement then | |
3694 | if Has_Excluded_Statement | |
3695 | (Statements (Handled_Statement_Sequence (S))) | |
3696 | or else Present | |
3697 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
3698 | then | |
3699 | return True; | |
3700 | end if; | |
996ae0b0 RK |
3701 | end if; |
3702 | ||
3703 | Next (S); | |
3704 | end loop; | |
3705 | ||
3706 | return False; | |
3707 | end Has_Excluded_Statement; | |
3708 | ||
3709 | ------------------------------- | |
3710 | -- Has_Pending_Instantiation -- | |
3711 | ------------------------------- | |
3712 | ||
3713 | function Has_Pending_Instantiation return Boolean is | |
ec4867fa | 3714 | S : Entity_Id; |
996ae0b0 RK |
3715 | |
3716 | begin | |
ec4867fa | 3717 | S := Current_Scope; |
996ae0b0 RK |
3718 | while Present (S) loop |
3719 | if Is_Compilation_Unit (S) | |
3720 | or else Is_Child_Unit (S) | |
3721 | then | |
3722 | return False; | |
bce79204 | 3723 | |
996ae0b0 RK |
3724 | elsif Ekind (S) = E_Package |
3725 | and then Has_Forward_Instantiation (S) | |
3726 | then | |
3727 | return True; | |
3728 | end if; | |
3729 | ||
3730 | S := Scope (S); | |
3731 | end loop; | |
3732 | ||
3733 | return False; | |
3734 | end Has_Pending_Instantiation; | |
3735 | ||
c8ef728f ES |
3736 | ------------------------ |
3737 | -- Has_Single_Return -- | |
3738 | ------------------------ | |
3739 | ||
3740 | function Has_Single_Return return Boolean is | |
3741 | Return_Statement : Node_Id := Empty; | |
3742 | ||
3743 | function Check_Return (N : Node_Id) return Traverse_Result; | |
3744 | ||
3745 | ------------------ | |
3746 | -- Check_Return -- | |
3747 | ------------------ | |
3748 | ||
3749 | function Check_Return (N : Node_Id) return Traverse_Result is | |
3750 | begin | |
5d37ba92 | 3751 | if Nkind (N) = N_Simple_Return_Statement then |
c8ef728f ES |
3752 | if Present (Expression (N)) |
3753 | and then Is_Entity_Name (Expression (N)) | |
3754 | then | |
3755 | if No (Return_Statement) then | |
3756 | Return_Statement := N; | |
3757 | return OK; | |
3758 | ||
3759 | elsif Chars (Expression (N)) = | |
3760 | Chars (Expression (Return_Statement)) | |
3761 | then | |
3762 | return OK; | |
3763 | ||
3764 | else | |
3765 | return Abandon; | |
3766 | end if; | |
3767 | ||
3e2399ba AC |
3768 | -- A return statement within an extended return is a noop |
3769 | -- after inlining. | |
3770 | ||
3771 | elsif No (Expression (N)) | |
3772 | and then Nkind (Parent (Parent (N))) = | |
3773 | N_Extended_Return_Statement | |
3774 | then | |
3775 | return OK; | |
3776 | ||
c8ef728f ES |
3777 | else |
3778 | -- Expression has wrong form | |
3779 | ||
3780 | return Abandon; | |
3781 | end if; | |
3782 | ||
3e2399ba AC |
3783 | -- We can only inline a build-in-place function if |
3784 | -- it has a single extended return. | |
3785 | ||
3786 | elsif Nkind (N) = N_Extended_Return_Statement then | |
3787 | if No (Return_Statement) then | |
3788 | Return_Statement := N; | |
3789 | return OK; | |
3790 | ||
3791 | else | |
3792 | return Abandon; | |
3793 | end if; | |
3794 | ||
c8ef728f ES |
3795 | else |
3796 | return OK; | |
3797 | end if; | |
3798 | end Check_Return; | |
3799 | ||
3800 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
3801 | ||
3802 | -- Start of processing for Has_Single_Return | |
3803 | ||
3804 | begin | |
3e2399ba AC |
3805 | if Check_All_Returns (N) /= OK then |
3806 | return False; | |
3807 | ||
3808 | elsif Nkind (Return_Statement) = N_Extended_Return_Statement then | |
3809 | return True; | |
3810 | ||
3811 | else | |
3812 | return Present (Declarations (N)) | |
3813 | and then Present (First (Declarations (N))) | |
3814 | and then Chars (Expression (Return_Statement)) = | |
3815 | Chars (Defining_Identifier (First (Declarations (N)))); | |
3816 | end if; | |
c8ef728f ES |
3817 | end Has_Single_Return; |
3818 | ||
fbf5a39b AC |
3819 | -------------------- |
3820 | -- Remove_Pragmas -- | |
3821 | -------------------- | |
3822 | ||
3823 | procedure Remove_Pragmas is | |
3824 | Decl : Node_Id; | |
3825 | Nxt : Node_Id; | |
3826 | ||
3827 | begin | |
3828 | Decl := First (Declarations (Body_To_Analyze)); | |
3829 | while Present (Decl) loop | |
3830 | Nxt := Next (Decl); | |
3831 | ||
3832 | if Nkind (Decl) = N_Pragma | |
76a69663 ES |
3833 | and then (Pragma_Name (Decl) = Name_Unreferenced |
3834 | or else | |
3835 | Pragma_Name (Decl) = Name_Unmodified) | |
fbf5a39b AC |
3836 | then |
3837 | Remove (Decl); | |
3838 | end if; | |
3839 | ||
3840 | Decl := Nxt; | |
3841 | end loop; | |
3842 | end Remove_Pragmas; | |
3843 | ||
e895b435 ES |
3844 | -------------------------- |
3845 | -- Uses_Secondary_Stack -- | |
3846 | -------------------------- | |
3847 | ||
3848 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean is | |
3849 | function Check_Call (N : Node_Id) return Traverse_Result; | |
3850 | -- Look for function calls that return an unconstrained type | |
3851 | ||
3852 | ---------------- | |
3853 | -- Check_Call -- | |
3854 | ---------------- | |
3855 | ||
3856 | function Check_Call (N : Node_Id) return Traverse_Result is | |
3857 | begin | |
3858 | if Nkind (N) = N_Function_Call | |
3859 | and then Is_Entity_Name (Name (N)) | |
3860 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
3861 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
3862 | then | |
3863 | Cannot_Inline | |
3864 | ("cannot inline & (call returns unconstrained type)?", | |
3865 | N, Subp); | |
3866 | return Abandon; | |
3867 | else | |
3868 | return OK; | |
3869 | end if; | |
3870 | end Check_Call; | |
3871 | ||
3872 | function Check_Calls is new Traverse_Func (Check_Call); | |
3873 | ||
3874 | begin | |
3875 | return Check_Calls (Bod) = Abandon; | |
3876 | end Uses_Secondary_Stack; | |
3877 | ||
996ae0b0 RK |
3878 | -- Start of processing for Build_Body_To_Inline |
3879 | ||
3880 | begin | |
8dbd1460 AC |
3881 | -- Return immediately if done already |
3882 | ||
996ae0b0 RK |
3883 | if Nkind (Decl) = N_Subprogram_Declaration |
3884 | and then Present (Body_To_Inline (Decl)) | |
3885 | then | |
8dbd1460 | 3886 | return; |
996ae0b0 | 3887 | |
08402a6d ES |
3888 | -- Functions that return unconstrained composite types require |
3889 | -- secondary stack handling, and cannot currently be inlined, unless | |
3890 | -- all return statements return a local variable that is the first | |
3891 | -- local declaration in the body. | |
996ae0b0 RK |
3892 | |
3893 | elsif Ekind (Subp) = E_Function | |
3894 | and then not Is_Scalar_Type (Etype (Subp)) | |
3895 | and then not Is_Access_Type (Etype (Subp)) | |
3896 | and then not Is_Constrained (Etype (Subp)) | |
3897 | then | |
08402a6d ES |
3898 | if not Has_Single_Return then |
3899 | Cannot_Inline | |
3900 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
3901 | return; | |
3902 | end if; | |
3903 | ||
3904 | -- Ditto for functions that return controlled types, where controlled | |
3905 | -- actions interfere in complex ways with inlining. | |
2820d220 AC |
3906 | |
3907 | elsif Ekind (Subp) = E_Function | |
048e5cef | 3908 | and then Needs_Finalization (Etype (Subp)) |
2820d220 AC |
3909 | then |
3910 | Cannot_Inline | |
3911 | ("cannot inline & (controlled return type)?", N, Subp); | |
3912 | return; | |
996ae0b0 RK |
3913 | end if; |
3914 | ||
d05ef0ab AC |
3915 | if Present (Declarations (N)) |
3916 | and then Has_Excluded_Declaration (Declarations (N)) | |
996ae0b0 | 3917 | then |
d05ef0ab | 3918 | return; |
996ae0b0 RK |
3919 | end if; |
3920 | ||
3921 | if Present (Handled_Statement_Sequence (N)) then | |
fbf5a39b AC |
3922 | if Present (Exception_Handlers (Handled_Statement_Sequence (N))) then |
3923 | Cannot_Inline | |
3924 | ("cannot inline& (exception handler)?", | |
3925 | First (Exception_Handlers (Handled_Statement_Sequence (N))), | |
3926 | Subp); | |
d05ef0ab | 3927 | return; |
996ae0b0 RK |
3928 | elsif |
3929 | Has_Excluded_Statement | |
3930 | (Statements (Handled_Statement_Sequence (N))) | |
3931 | then | |
d05ef0ab | 3932 | return; |
996ae0b0 RK |
3933 | end if; |
3934 | end if; | |
3935 | ||
3936 | -- We do not inline a subprogram that is too large, unless it is | |
3937 | -- marked Inline_Always. This pragma does not suppress the other | |
3938 | -- checks on inlining (forbidden declarations, handlers, etc). | |
3939 | ||
3940 | if Stat_Count > Max_Size | |
800621e0 | 3941 | and then not Has_Pragma_Inline_Always (Subp) |
996ae0b0 | 3942 | then |
fbf5a39b | 3943 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); |
d05ef0ab | 3944 | return; |
996ae0b0 RK |
3945 | end if; |
3946 | ||
3947 | if Has_Pending_Instantiation then | |
3948 | Cannot_Inline | |
fbf5a39b AC |
3949 | ("cannot inline& (forward instance within enclosing body)?", |
3950 | N, Subp); | |
d05ef0ab AC |
3951 | return; |
3952 | end if; | |
3953 | ||
3954 | -- Within an instance, the body to inline must be treated as a nested | |
3955 | -- generic, so that the proper global references are preserved. | |
3956 | ||
ce4e59c4 ST |
3957 | -- Note that we do not do this at the library level, because it is not |
3958 | -- needed, and furthermore this causes trouble if front end inlining | |
3959 | -- is activated (-gnatN). | |
3960 | ||
3961 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
3962 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); |
3963 | Original_Body := Copy_Generic_Node (N, Empty, True); | |
3964 | else | |
3965 | Original_Body := Copy_Separate_Tree (N); | |
996ae0b0 RK |
3966 | end if; |
3967 | ||
d05ef0ab AC |
3968 | -- We need to capture references to the formals in order to substitute |
3969 | -- the actuals at the point of inlining, i.e. instantiation. To treat | |
3970 | -- the formals as globals to the body to inline, we nest it within | |
3971 | -- a dummy parameterless subprogram, declared within the real one. | |
24105bab AC |
3972 | -- To avoid generating an internal name (which is never public, and |
3973 | -- which affects serial numbers of other generated names), we use | |
3974 | -- an internal symbol that cannot conflict with user declarations. | |
d05ef0ab AC |
3975 | |
3976 | Set_Parameter_Specifications (Specification (Original_Body), No_List); | |
24105bab AC |
3977 | Set_Defining_Unit_Name |
3978 | (Specification (Original_Body), | |
3979 | Make_Defining_Identifier (Sloc (N), Name_uParent)); | |
d05ef0ab AC |
3980 | Set_Corresponding_Spec (Original_Body, Empty); |
3981 | ||
996ae0b0 RK |
3982 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); |
3983 | ||
3984 | -- Set return type of function, which is also global and does not need | |
3985 | -- to be resolved. | |
3986 | ||
3987 | if Ekind (Subp) = E_Function then | |
41251c60 | 3988 | Set_Result_Definition (Specification (Body_To_Analyze), |
996ae0b0 RK |
3989 | New_Occurrence_Of (Etype (Subp), Sloc (N))); |
3990 | end if; | |
3991 | ||
3992 | if No (Declarations (N)) then | |
3993 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
3994 | else | |
3995 | Append (Body_To_Analyze, Declarations (N)); | |
3996 | end if; | |
3997 | ||
3998 | Expander_Mode_Save_And_Set (False); | |
fbf5a39b | 3999 | Remove_Pragmas; |
996ae0b0 RK |
4000 | |
4001 | Analyze (Body_To_Analyze); | |
0a36105d | 4002 | Push_Scope (Defining_Entity (Body_To_Analyze)); |
996ae0b0 RK |
4003 | Save_Global_References (Original_Body); |
4004 | End_Scope; | |
4005 | Remove (Body_To_Analyze); | |
4006 | ||
4007 | Expander_Mode_Restore; | |
d05ef0ab | 4008 | |
ce4e59c4 ST |
4009 | -- Restore environment if previously saved |
4010 | ||
4011 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
4012 | Restore_Env; |
4013 | end if; | |
e895b435 ES |
4014 | |
4015 | -- If secondary stk used there is no point in inlining. We have | |
4016 | -- already issued the warning in this case, so nothing to do. | |
4017 | ||
4018 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
4019 | return; | |
4020 | end if; | |
4021 | ||
4022 | Set_Body_To_Inline (Decl, Original_Body); | |
4023 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Subp)); | |
4024 | Set_Is_Inlined (Subp); | |
996ae0b0 RK |
4025 | end Build_Body_To_Inline; |
4026 | ||
fbf5a39b AC |
4027 | ------------------- |
4028 | -- Cannot_Inline -- | |
4029 | ------------------- | |
4030 | ||
4031 | procedure Cannot_Inline (Msg : String; N : Node_Id; Subp : Entity_Id) is | |
4032 | begin | |
676e8420 AC |
4033 | -- Do not emit warning if this is a predefined unit which is not the |
4034 | -- main unit. With validity checks enabled, some predefined subprograms | |
4035 | -- may contain nested subprograms and become ineligible for inlining. | |
fbf5a39b AC |
4036 | |
4037 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
4038 | and then not In_Extended_Main_Source_Unit (Subp) | |
4039 | then | |
4040 | null; | |
4041 | ||
800621e0 | 4042 | elsif Has_Pragma_Inline_Always (Subp) then |
e895b435 ES |
4043 | |
4044 | -- Remove last character (question mark) to make this into an error, | |
4045 | -- because the Inline_Always pragma cannot be obeyed. | |
4046 | ||
ec4867fa | 4047 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); |
fbf5a39b AC |
4048 | |
4049 | elsif Ineffective_Inline_Warnings then | |
4050 | Error_Msg_NE (Msg, N, Subp); | |
4051 | end if; | |
4052 | end Cannot_Inline; | |
4053 | ||
996ae0b0 RK |
4054 | ----------------------- |
4055 | -- Check_Conformance -- | |
4056 | ----------------------- | |
4057 | ||
4058 | procedure Check_Conformance | |
41251c60 JM |
4059 | (New_Id : Entity_Id; |
4060 | Old_Id : Entity_Id; | |
4061 | Ctype : Conformance_Type; | |
4062 | Errmsg : Boolean; | |
4063 | Conforms : out Boolean; | |
4064 | Err_Loc : Node_Id := Empty; | |
4065 | Get_Inst : Boolean := False; | |
4066 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 4067 | is |
996ae0b0 | 4068 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
4069 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
4070 | -- If Errmsg is True, then processing continues to post an error message | |
4071 | -- for conformance error on given node. Two messages are output. The | |
4072 | -- first message points to the previous declaration with a general "no | |
4073 | -- conformance" message. The second is the detailed reason, supplied as | |
4074 | -- Msg. The parameter N provide information for a possible & insertion | |
4075 | -- in the message, and also provides the location for posting the | |
4076 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
4077 | |
4078 | ----------------------- | |
4079 | -- Conformance_Error -- | |
4080 | ----------------------- | |
4081 | ||
4082 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
4083 | Enode : Node_Id; | |
4084 | ||
4085 | begin | |
4086 | Conforms := False; | |
4087 | ||
4088 | if Errmsg then | |
4089 | if No (Err_Loc) then | |
4090 | Enode := N; | |
4091 | else | |
4092 | Enode := Err_Loc; | |
4093 | end if; | |
4094 | ||
4095 | Error_Msg_Sloc := Sloc (Old_Id); | |
4096 | ||
4097 | case Ctype is | |
4098 | when Type_Conformant => | |
483c78cb | 4099 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
4100 | ("not type conformant with declaration#!", Enode); |
4101 | ||
4102 | when Mode_Conformant => | |
19590d70 | 4103 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4104 | Error_Msg_N |
19590d70 GD |
4105 | ("not mode conformant with operation inherited#!", |
4106 | Enode); | |
4107 | else | |
ed2233dc | 4108 | Error_Msg_N |
19590d70 GD |
4109 | ("not mode conformant with declaration#!", Enode); |
4110 | end if; | |
996ae0b0 RK |
4111 | |
4112 | when Subtype_Conformant => | |
19590d70 | 4113 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 4114 | Error_Msg_N |
19590d70 GD |
4115 | ("not subtype conformant with operation inherited#!", |
4116 | Enode); | |
4117 | else | |
ed2233dc | 4118 | Error_Msg_N |
19590d70 GD |
4119 | ("not subtype conformant with declaration#!", Enode); |
4120 | end if; | |
996ae0b0 RK |
4121 | |
4122 | when Fully_Conformant => | |
19590d70 | 4123 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 4124 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4125 | ("not fully conformant with operation inherited#!", |
4126 | Enode); | |
4127 | else | |
483c78cb | 4128 | Error_Msg_N -- CODEFIX |
19590d70 GD |
4129 | ("not fully conformant with declaration#!", Enode); |
4130 | end if; | |
996ae0b0 RK |
4131 | end case; |
4132 | ||
4133 | Error_Msg_NE (Msg, Enode, N); | |
4134 | end if; | |
4135 | end Conformance_Error; | |
4136 | ||
ec4867fa ES |
4137 | -- Local Variables |
4138 | ||
4139 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
4140 | New_Type : constant Entity_Id := Etype (New_Id); | |
4141 | Old_Formal : Entity_Id; | |
4142 | New_Formal : Entity_Id; | |
4143 | Access_Types_Match : Boolean; | |
4144 | Old_Formal_Base : Entity_Id; | |
4145 | New_Formal_Base : Entity_Id; | |
4146 | ||
996ae0b0 RK |
4147 | -- Start of processing for Check_Conformance |
4148 | ||
4149 | begin | |
4150 | Conforms := True; | |
4151 | ||
82c80734 RD |
4152 | -- We need a special case for operators, since they don't appear |
4153 | -- explicitly. | |
996ae0b0 RK |
4154 | |
4155 | if Ctype = Type_Conformant then | |
4156 | if Ekind (New_Id) = E_Operator | |
4157 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
4158 | then | |
4159 | return; | |
4160 | end if; | |
4161 | end if; | |
4162 | ||
4163 | -- If both are functions/operators, check return types conform | |
4164 | ||
4165 | if Old_Type /= Standard_Void_Type | |
4166 | and then New_Type /= Standard_Void_Type | |
4167 | then | |
fceeaab6 ES |
4168 | |
4169 | -- If we are checking interface conformance we omit controlling | |
4170 | -- arguments and result, because we are only checking the conformance | |
4171 | -- of the remaining parameters. | |
4172 | ||
4173 | if Has_Controlling_Result (Old_Id) | |
4174 | and then Has_Controlling_Result (New_Id) | |
4175 | and then Skip_Controlling_Formals | |
4176 | then | |
4177 | null; | |
4178 | ||
4179 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
5d37ba92 | 4180 | Conformance_Error ("\return type does not match!", New_Id); |
996ae0b0 RK |
4181 | return; |
4182 | end if; | |
4183 | ||
41251c60 | 4184 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 4185 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 4186 | |
0791fbe9 | 4187 | if Ada_Version >= Ada_2005 |
41251c60 JM |
4188 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
4189 | and then | |
4190 | (Can_Never_Be_Null (Old_Type) | |
4191 | /= Can_Never_Be_Null (New_Type) | |
4192 | or else Is_Access_Constant (Etype (Old_Type)) | |
4193 | /= Is_Access_Constant (Etype (New_Type))) | |
4194 | then | |
5d37ba92 | 4195 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
4196 | return; |
4197 | end if; | |
4198 | ||
996ae0b0 RK |
4199 | -- If either is a function/operator and the other isn't, error |
4200 | ||
4201 | elsif Old_Type /= Standard_Void_Type | |
4202 | or else New_Type /= Standard_Void_Type | |
4203 | then | |
5d37ba92 | 4204 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
4205 | return; |
4206 | end if; | |
4207 | ||
0a36105d | 4208 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
4209 | -- If this is a renaming as body, refine error message to indicate that |
4210 | -- the conflict is with the original declaration. If the entity is not | |
4211 | -- frozen, the conventions don't have to match, the one of the renamed | |
4212 | -- entity is inherited. | |
4213 | ||
4214 | if Ctype >= Subtype_Conformant then | |
996ae0b0 RK |
4215 | if Convention (Old_Id) /= Convention (New_Id) then |
4216 | ||
4217 | if not Is_Frozen (New_Id) then | |
4218 | null; | |
4219 | ||
4220 | elsif Present (Err_Loc) | |
4221 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
4222 | and then Present (Corresponding_Spec (Err_Loc)) | |
4223 | then | |
4224 | Error_Msg_Name_1 := Chars (New_Id); | |
4225 | Error_Msg_Name_2 := | |
4226 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 4227 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
4228 | |
4229 | else | |
5d37ba92 | 4230 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
4231 | end if; |
4232 | ||
4233 | return; | |
4234 | ||
4235 | elsif Is_Formal_Subprogram (Old_Id) | |
4236 | or else Is_Formal_Subprogram (New_Id) | |
4237 | then | |
5d37ba92 | 4238 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 RK |
4239 | return; |
4240 | end if; | |
4241 | end if; | |
4242 | ||
4243 | -- Deal with parameters | |
4244 | ||
4245 | -- Note: we use the entity information, rather than going directly | |
4246 | -- to the specification in the tree. This is not only simpler, but | |
4247 | -- absolutely necessary for some cases of conformance tests between | |
4248 | -- operators, where the declaration tree simply does not exist! | |
4249 | ||
4250 | Old_Formal := First_Formal (Old_Id); | |
4251 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 4252 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
4253 | if Is_Controlling_Formal (Old_Formal) |
4254 | and then Is_Controlling_Formal (New_Formal) | |
4255 | and then Skip_Controlling_Formals | |
4256 | then | |
a2dc5812 AC |
4257 | -- The controlling formals will have different types when |
4258 | -- comparing an interface operation with its match, but both | |
4259 | -- or neither must be access parameters. | |
4260 | ||
4261 | if Is_Access_Type (Etype (Old_Formal)) | |
4262 | = | |
4263 | Is_Access_Type (Etype (New_Formal)) | |
4264 | then | |
4265 | goto Skip_Controlling_Formal; | |
4266 | else | |
4267 | Conformance_Error | |
4268 | ("\access parameter does not match!", New_Formal); | |
4269 | end if; | |
41251c60 JM |
4270 | end if; |
4271 | ||
fbf5a39b AC |
4272 | if Ctype = Fully_Conformant then |
4273 | ||
4274 | -- Names must match. Error message is more accurate if we do | |
4275 | -- this before checking that the types of the formals match. | |
4276 | ||
4277 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
5d37ba92 | 4278 | Conformance_Error ("\name & does not match!", New_Formal); |
fbf5a39b AC |
4279 | |
4280 | -- Set error posted flag on new formal as well to stop | |
4281 | -- junk cascaded messages in some cases. | |
4282 | ||
4283 | Set_Error_Posted (New_Formal); | |
4284 | return; | |
4285 | end if; | |
40b93859 RD |
4286 | |
4287 | -- Null exclusion must match | |
4288 | ||
4289 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
4290 | /= | |
4291 | Null_Exclusion_Present (Parent (New_Formal)) | |
4292 | then | |
4293 | -- Only give error if both come from source. This should be | |
4294 | -- investigated some time, since it should not be needed ??? | |
4295 | ||
4296 | if Comes_From_Source (Old_Formal) | |
4297 | and then | |
4298 | Comes_From_Source (New_Formal) | |
4299 | then | |
4300 | Conformance_Error | |
4301 | ("\null exclusion for & does not match", New_Formal); | |
4302 | ||
4303 | -- Mark error posted on the new formal to avoid duplicated | |
4304 | -- complaint about types not matching. | |
4305 | ||
4306 | Set_Error_Posted (New_Formal); | |
4307 | end if; | |
4308 | end if; | |
fbf5a39b | 4309 | end if; |
996ae0b0 | 4310 | |
ec4867fa ES |
4311 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
4312 | -- case occurs whenever a subprogram is being renamed and one of its | |
4313 | -- parameters imposes a null exclusion. For example: | |
4314 | ||
4315 | -- type T is null record; | |
4316 | -- type Acc_T is access T; | |
4317 | -- subtype Acc_T_Sub is Acc_T; | |
4318 | ||
4319 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
4320 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
4321 | -- renames P; | |
4322 | ||
4323 | Old_Formal_Base := Etype (Old_Formal); | |
4324 | New_Formal_Base := Etype (New_Formal); | |
4325 | ||
4326 | if Get_Inst then | |
4327 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
4328 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
4329 | end if; | |
4330 | ||
0791fbe9 | 4331 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa ES |
4332 | |
4333 | -- Ensure that this rule is only applied when New_Id is a | |
5d37ba92 | 4334 | -- renaming of Old_Id. |
ec4867fa | 4335 | |
5d37ba92 ES |
4336 | and then Nkind (Parent (Parent (New_Id))) = |
4337 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
4338 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
4339 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
4340 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
4341 | ||
4342 | -- Now handle the allowed access-type case | |
4343 | ||
4344 | and then Is_Access_Type (Old_Formal_Base) | |
4345 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 ES |
4346 | |
4347 | -- The type kinds must match. The only exception occurs with | |
4348 | -- multiple generics of the form: | |
4349 | ||
4350 | -- generic generic | |
4351 | -- type F is private; type A is private; | |
4352 | -- type F_Ptr is access F; type A_Ptr is access A; | |
4353 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
4354 | -- package F_Pack is ... package A_Pack is | |
4355 | -- package F_Inst is | |
4356 | -- new F_Pack (A, A_Ptr, A_P); | |
4357 | ||
4358 | -- When checking for conformance between the parameters of A_P | |
4359 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
4360 | -- because the compiler has transformed A_Ptr into a subtype of | |
4361 | -- F_Ptr. We catch this case in the code below. | |
4362 | ||
4363 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
4364 | or else | |
4365 | (Is_Generic_Type (Old_Formal_Base) | |
4366 | and then Is_Generic_Type (New_Formal_Base) | |
4367 | and then Is_Internal (New_Formal_Base) | |
4368 | and then Etype (Etype (New_Formal_Base)) = | |
4369 | Old_Formal_Base)) | |
ec4867fa ES |
4370 | and then Directly_Designated_Type (Old_Formal_Base) = |
4371 | Directly_Designated_Type (New_Formal_Base) | |
4372 | and then ((Is_Itype (Old_Formal_Base) | |
4373 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
4374 | or else | |
4375 | (Is_Itype (New_Formal_Base) | |
4376 | and then Can_Never_Be_Null (New_Formal_Base))); | |
4377 | ||
996ae0b0 RK |
4378 | -- Types must always match. In the visible part of an instance, |
4379 | -- usual overloading rules for dispatching operations apply, and | |
4380 | -- we check base types (not the actual subtypes). | |
4381 | ||
4382 | if In_Instance_Visible_Part | |
4383 | and then Is_Dispatching_Operation (New_Id) | |
4384 | then | |
4385 | if not Conforming_Types | |
ec4867fa ES |
4386 | (T1 => Base_Type (Etype (Old_Formal)), |
4387 | T2 => Base_Type (Etype (New_Formal)), | |
4388 | Ctype => Ctype, | |
4389 | Get_Inst => Get_Inst) | |
4390 | and then not Access_Types_Match | |
996ae0b0 | 4391 | then |
5d37ba92 | 4392 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
4393 | return; |
4394 | end if; | |
4395 | ||
4396 | elsif not Conforming_Types | |
5d37ba92 ES |
4397 | (T1 => Old_Formal_Base, |
4398 | T2 => New_Formal_Base, | |
ec4867fa ES |
4399 | Ctype => Ctype, |
4400 | Get_Inst => Get_Inst) | |
4401 | and then not Access_Types_Match | |
996ae0b0 | 4402 | then |
c27f2f15 RD |
4403 | -- Don't give error message if old type is Any_Type. This test |
4404 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
4405 | ||
4406 | if Errmsg and then Old_Formal_Base = Any_Type then | |
4407 | Conforms := False; | |
4408 | else | |
4409 | Conformance_Error ("\type of & does not match!", New_Formal); | |
4410 | end if; | |
4411 | ||
996ae0b0 RK |
4412 | return; |
4413 | end if; | |
4414 | ||
4415 | -- For mode conformance, mode must match | |
4416 | ||
5d37ba92 ES |
4417 | if Ctype >= Mode_Conformant then |
4418 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
4419 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
4420 | or else not Is_Primitive_Wrapper (New_Id) | |
4421 | then | |
4422 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 4423 | |
dd54644b JM |
4424 | else |
4425 | declare | |
c199ccf7 | 4426 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b JM |
4427 | begin |
4428 | if Is_Protected_Type | |
4429 | (Corresponding_Concurrent_Type (T)) | |
4430 | then | |
4431 | Error_Msg_PT (T, New_Id); | |
4432 | else | |
4433 | Conformance_Error | |
4434 | ("\mode of & does not match!", New_Formal); | |
4435 | end if; | |
4436 | end; | |
4437 | end if; | |
4438 | ||
5d37ba92 ES |
4439 | return; |
4440 | ||
4441 | -- Part of mode conformance for access types is having the same | |
4442 | -- constant modifier. | |
4443 | ||
4444 | elsif Access_Types_Match | |
4445 | and then Is_Access_Constant (Old_Formal_Base) /= | |
4446 | Is_Access_Constant (New_Formal_Base) | |
4447 | then | |
4448 | Conformance_Error | |
4449 | ("\constant modifier does not match!", New_Formal); | |
4450 | return; | |
4451 | end if; | |
996ae0b0 RK |
4452 | end if; |
4453 | ||
0a36105d | 4454 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 4455 | |
0a36105d JM |
4456 | -- Ada 2005 (AI-231): In case of anonymous access types check |
4457 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
4458 | -- match. For null exclusion, we test the types rather than the |
4459 | -- formals themselves, since the attribute is only set reliably | |
4460 | -- on the formals in the Ada 95 case, and we exclude the case | |
4461 | -- where Old_Formal is marked as controlling, to avoid errors | |
4462 | -- when matching completing bodies with dispatching declarations | |
4463 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 4464 | |
0791fbe9 | 4465 | if Ada_Version >= Ada_2005 |
0a36105d JM |
4466 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
4467 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
4468 | and then | |
c7b9d548 AC |
4469 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
4470 | Can_Never_Be_Null (Etype (New_Formal)) | |
4471 | and then | |
4472 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
4473 | or else |
4474 | Is_Access_Constant (Etype (Old_Formal)) /= | |
4475 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
4476 | |
4477 | -- Do not complain if error already posted on New_Formal. This | |
4478 | -- avoids some redundant error messages. | |
4479 | ||
4480 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
4481 | then |
4482 | -- It is allowed to omit the null-exclusion in case of stream | |
4483 | -- attribute subprograms. We recognize stream subprograms | |
4484 | -- through their TSS-generated suffix. | |
996ae0b0 | 4485 | |
0a36105d JM |
4486 | declare |
4487 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
4488 | begin | |
4489 | if TSS_Name /= TSS_Stream_Read | |
4490 | and then TSS_Name /= TSS_Stream_Write | |
4491 | and then TSS_Name /= TSS_Stream_Input | |
4492 | and then TSS_Name /= TSS_Stream_Output | |
4493 | then | |
4494 | Conformance_Error | |
5d37ba92 | 4495 | ("\type of & does not match!", New_Formal); |
0a36105d JM |
4496 | return; |
4497 | end if; | |
4498 | end; | |
4499 | end if; | |
4500 | end if; | |
41251c60 | 4501 | |
0a36105d | 4502 | -- Full conformance checks |
41251c60 | 4503 | |
0a36105d | 4504 | if Ctype = Fully_Conformant then |
e660dbf7 | 4505 | |
0a36105d | 4506 | -- We have checked already that names match |
e660dbf7 | 4507 | |
0a36105d | 4508 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
4509 | |
4510 | -- Check default expressions for in parameters | |
4511 | ||
996ae0b0 RK |
4512 | declare |
4513 | NewD : constant Boolean := | |
4514 | Present (Default_Value (New_Formal)); | |
4515 | OldD : constant Boolean := | |
4516 | Present (Default_Value (Old_Formal)); | |
4517 | begin | |
4518 | if NewD or OldD then | |
4519 | ||
82c80734 RD |
4520 | -- The old default value has been analyzed because the |
4521 | -- current full declaration will have frozen everything | |
0a36105d JM |
4522 | -- before. The new default value has not been analyzed, |
4523 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
4524 | |
4525 | if NewD then | |
0a36105d | 4526 | Push_Scope (New_Id); |
21d27997 | 4527 | Preanalyze_Spec_Expression |
fbf5a39b | 4528 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
4529 | End_Scope; |
4530 | end if; | |
4531 | ||
4532 | if not (NewD and OldD) | |
4533 | or else not Fully_Conformant_Expressions | |
4534 | (Default_Value (Old_Formal), | |
4535 | Default_Value (New_Formal)) | |
4536 | then | |
4537 | Conformance_Error | |
5d37ba92 | 4538 | ("\default expression for & does not match!", |
996ae0b0 RK |
4539 | New_Formal); |
4540 | return; | |
4541 | end if; | |
4542 | end if; | |
4543 | end; | |
4544 | end if; | |
4545 | end if; | |
4546 | ||
4547 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 4548 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
4549 | -- or if either old or new instance is not from the source program. |
4550 | ||
0ab80019 | 4551 | if Ada_Version = Ada_83 |
996ae0b0 RK |
4552 | and then Sloc (Old_Id) > Standard_Location |
4553 | and then Sloc (New_Id) > Standard_Location | |
4554 | and then Comes_From_Source (Old_Id) | |
4555 | and then Comes_From_Source (New_Id) | |
4556 | then | |
4557 | declare | |
4558 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
4559 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
4560 | ||
4561 | begin | |
4562 | -- Explicit IN must be present or absent in both cases. This | |
4563 | -- test is required only in the full conformance case. | |
4564 | ||
4565 | if In_Present (Old_Param) /= In_Present (New_Param) | |
4566 | and then Ctype = Fully_Conformant | |
4567 | then | |
4568 | Conformance_Error | |
5d37ba92 | 4569 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
4570 | New_Formal); |
4571 | return; | |
4572 | end if; | |
4573 | ||
4574 | -- Grouping (use of comma in param lists) must be the same | |
4575 | -- This is where we catch a misconformance like: | |
4576 | ||
0a36105d | 4577 | -- A, B : Integer |
996ae0b0 RK |
4578 | -- A : Integer; B : Integer |
4579 | ||
4580 | -- which are represented identically in the tree except | |
4581 | -- for the setting of the flags More_Ids and Prev_Ids. | |
4582 | ||
4583 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
4584 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
4585 | then | |
4586 | Conformance_Error | |
5d37ba92 | 4587 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
4588 | return; |
4589 | end if; | |
4590 | end; | |
4591 | end if; | |
4592 | ||
41251c60 JM |
4593 | -- This label is required when skipping controlling formals |
4594 | ||
4595 | <<Skip_Controlling_Formal>> | |
4596 | ||
996ae0b0 RK |
4597 | Next_Formal (Old_Formal); |
4598 | Next_Formal (New_Formal); | |
4599 | end loop; | |
4600 | ||
4601 | if Present (Old_Formal) then | |
5d37ba92 | 4602 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
4603 | return; |
4604 | ||
4605 | elsif Present (New_Formal) then | |
5d37ba92 | 4606 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
4607 | return; |
4608 | end if; | |
996ae0b0 RK |
4609 | end Check_Conformance; |
4610 | ||
ec4867fa ES |
4611 | ----------------------- |
4612 | -- Check_Conventions -- | |
4613 | ----------------------- | |
4614 | ||
4615 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 4616 | Ifaces_List : Elist_Id; |
0a36105d | 4617 | |
ce2b6ba5 | 4618 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
4619 | -- Verify that the convention of inherited dispatching operation Op is |
4620 | -- consistent among all subprograms it overrides. In order to minimize | |
4621 | -- the search, Search_From is utilized to designate a specific point in | |
4622 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
4623 | |
4624 | ---------------------- | |
4625 | -- Check_Convention -- | |
4626 | ---------------------- | |
4627 | ||
ce2b6ba5 JM |
4628 | procedure Check_Convention (Op : Entity_Id) is |
4629 | Iface_Elmt : Elmt_Id; | |
4630 | Iface_Prim_Elmt : Elmt_Id; | |
4631 | Iface_Prim : Entity_Id; | |
ec4867fa | 4632 | |
ce2b6ba5 JM |
4633 | begin |
4634 | Iface_Elmt := First_Elmt (Ifaces_List); | |
4635 | while Present (Iface_Elmt) loop | |
4636 | Iface_Prim_Elmt := | |
4637 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); | |
4638 | while Present (Iface_Prim_Elmt) loop | |
4639 | Iface_Prim := Node (Iface_Prim_Elmt); | |
4640 | ||
4641 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
4642 | and then Convention (Iface_Prim) /= Convention (Op) | |
4643 | then | |
ed2233dc | 4644 | Error_Msg_N |
ce2b6ba5 | 4645 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 4646 | |
ce2b6ba5 JM |
4647 | Error_Msg_Name_1 := Chars (Op); |
4648 | Error_Msg_Name_2 := Get_Convention_Name (Convention (Op)); | |
4649 | Error_Msg_Sloc := Sloc (Op); | |
ec4867fa | 4650 | |
7a963087 | 4651 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 4652 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 4653 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 4654 | else |
ed2233dc | 4655 | Error_Msg_N |
19d846a0 RD |
4656 | ("\\overriding operation % with " & |
4657 | "convention % defined #", Typ); | |
ce2b6ba5 | 4658 | end if; |
ec4867fa | 4659 | |
ce2b6ba5 JM |
4660 | else pragma Assert (Present (Alias (Op))); |
4661 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
ed2233dc | 4662 | Error_Msg_N |
19d846a0 RD |
4663 | ("\\inherited operation % with " & |
4664 | "convention % defined #", Typ); | |
ce2b6ba5 | 4665 | end if; |
ec4867fa | 4666 | |
ce2b6ba5 JM |
4667 | Error_Msg_Name_1 := Chars (Op); |
4668 | Error_Msg_Name_2 := | |
4669 | Get_Convention_Name (Convention (Iface_Prim)); | |
4670 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
ed2233dc | 4671 | Error_Msg_N |
19d846a0 RD |
4672 | ("\\overridden operation % with " & |
4673 | "convention % defined #", Typ); | |
ec4867fa | 4674 | |
ce2b6ba5 | 4675 | -- Avoid cascading errors |
ec4867fa | 4676 | |
ce2b6ba5 JM |
4677 | return; |
4678 | end if; | |
ec4867fa | 4679 | |
ce2b6ba5 JM |
4680 | Next_Elmt (Iface_Prim_Elmt); |
4681 | end loop; | |
ec4867fa | 4682 | |
ce2b6ba5 | 4683 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
4684 | end loop; |
4685 | end Check_Convention; | |
4686 | ||
4687 | -- Local variables | |
4688 | ||
4689 | Prim_Op : Entity_Id; | |
4690 | Prim_Op_Elmt : Elmt_Id; | |
4691 | ||
4692 | -- Start of processing for Check_Conventions | |
4693 | ||
4694 | begin | |
ce2b6ba5 JM |
4695 | if not Has_Interfaces (Typ) then |
4696 | return; | |
4697 | end if; | |
4698 | ||
4699 | Collect_Interfaces (Typ, Ifaces_List); | |
4700 | ||
0a36105d JM |
4701 | -- The algorithm checks every overriding dispatching operation against |
4702 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 4703 | -- differences in conventions. |
ec4867fa ES |
4704 | |
4705 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
4706 | while Present (Prim_Op_Elmt) loop | |
4707 | Prim_Op := Node (Prim_Op_Elmt); | |
4708 | ||
0a36105d | 4709 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 4710 | -- since they always have the same convention. |
ec4867fa | 4711 | |
ce2b6ba5 JM |
4712 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
4713 | Check_Convention (Prim_Op); | |
ec4867fa ES |
4714 | end if; |
4715 | ||
4716 | Next_Elmt (Prim_Op_Elmt); | |
4717 | end loop; | |
4718 | end Check_Conventions; | |
4719 | ||
996ae0b0 RK |
4720 | ------------------------------ |
4721 | -- Check_Delayed_Subprogram -- | |
4722 | ------------------------------ | |
4723 | ||
4724 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
4725 | F : Entity_Id; | |
4726 | ||
4727 | procedure Possible_Freeze (T : Entity_Id); | |
4728 | -- T is the type of either a formal parameter or of the return type. | |
4729 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
4730 | -- subprogram itself must be delayed. If T is the limited view of an |
4731 | -- incomplete type the subprogram must be frozen as well, because | |
4732 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 4733 | |
82c80734 RD |
4734 | --------------------- |
4735 | -- Possible_Freeze -- | |
4736 | --------------------- | |
4737 | ||
996ae0b0 RK |
4738 | procedure Possible_Freeze (T : Entity_Id) is |
4739 | begin | |
4a13695c | 4740 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
4741 | Set_Has_Delayed_Freeze (Designator); |
4742 | ||
4743 | elsif Is_Access_Type (T) | |
4744 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
4745 | and then not Is_Frozen (Designated_Type (T)) | |
4746 | then | |
4747 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 4748 | |
4a13695c | 4749 | elsif Ekind (T) = E_Incomplete_Type and then From_With_Type (T) then |
e358346d | 4750 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 4751 | |
9aff36e9 RD |
4752 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
4753 | -- of a subprogram or entry declaration. | |
406935b6 AC |
4754 | |
4755 | elsif Ekind (T) = E_Incomplete_Type | |
4756 | and then Ada_Version >= Ada_2012 | |
4757 | then | |
4758 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 4759 | end if; |
4a13695c | 4760 | |
996ae0b0 RK |
4761 | end Possible_Freeze; |
4762 | ||
4763 | -- Start of processing for Check_Delayed_Subprogram | |
4764 | ||
4765 | begin | |
76e3504f AC |
4766 | -- All subprograms, including abstract subprograms, may need a freeze |
4767 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 4768 | |
76e3504f AC |
4769 | Possible_Freeze (Etype (Designator)); |
4770 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 4771 | |
76e3504f AC |
4772 | -- Need delayed freeze if any of the formal types themselves need |
4773 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 4774 | |
76e3504f AC |
4775 | F := First_Formal (Designator); |
4776 | while Present (F) loop | |
4777 | Possible_Freeze (Etype (F)); | |
4778 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
4779 | Next_Formal (F); | |
4780 | end loop; | |
996ae0b0 RK |
4781 | |
4782 | -- Mark functions that return by reference. Note that it cannot be | |
4783 | -- done for delayed_freeze subprograms because the underlying | |
4784 | -- returned type may not be known yet (for private types) | |
4785 | ||
4786 | if not Has_Delayed_Freeze (Designator) | |
4787 | and then Expander_Active | |
4788 | then | |
4789 | declare | |
4790 | Typ : constant Entity_Id := Etype (Designator); | |
4791 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
9694c039 | 4792 | |
996ae0b0 | 4793 | begin |
40f07b4b | 4794 | if Is_Immutably_Limited_Type (Typ) then |
996ae0b0 | 4795 | Set_Returns_By_Ref (Designator); |
9694c039 | 4796 | |
048e5cef | 4797 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
4798 | Set_Returns_By_Ref (Designator); |
4799 | end if; | |
4800 | end; | |
4801 | end if; | |
4802 | end Check_Delayed_Subprogram; | |
4803 | ||
4804 | ------------------------------------ | |
4805 | -- Check_Discriminant_Conformance -- | |
4806 | ------------------------------------ | |
4807 | ||
4808 | procedure Check_Discriminant_Conformance | |
4809 | (N : Node_Id; | |
4810 | Prev : Entity_Id; | |
4811 | Prev_Loc : Node_Id) | |
4812 | is | |
4813 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
4814 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
4815 | New_Discr_Id : Entity_Id; | |
4816 | New_Discr_Type : Entity_Id; | |
4817 | ||
4818 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
4819 | -- Post error message for conformance error on given node. Two messages |
4820 | -- are output. The first points to the previous declaration with a | |
4821 | -- general "no conformance" message. The second is the detailed reason, | |
4822 | -- supplied as Msg. The parameter N provide information for a possible | |
4823 | -- & insertion in the message. | |
996ae0b0 RK |
4824 | |
4825 | ----------------------- | |
4826 | -- Conformance_Error -- | |
4827 | ----------------------- | |
4828 | ||
4829 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
4830 | begin | |
4831 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
4832 | Error_Msg_N -- CODEFIX |
4833 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
4834 | Error_Msg_NE (Msg, N, N); |
4835 | end Conformance_Error; | |
4836 | ||
4837 | -- Start of processing for Check_Discriminant_Conformance | |
4838 | ||
4839 | begin | |
4840 | while Present (Old_Discr) and then Present (New_Discr) loop | |
4841 | ||
4842 | New_Discr_Id := Defining_Identifier (New_Discr); | |
4843 | ||
82c80734 RD |
4844 | -- The subtype mark of the discriminant on the full type has not |
4845 | -- been analyzed so we do it here. For an access discriminant a new | |
4846 | -- type is created. | |
996ae0b0 RK |
4847 | |
4848 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
4849 | New_Discr_Type := | |
4850 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
4851 | ||
4852 | else | |
4853 | Analyze (Discriminant_Type (New_Discr)); | |
4854 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
4855 | |
4856 | -- Ada 2005: if the discriminant definition carries a null | |
4857 | -- exclusion, create an itype to check properly for consistency | |
4858 | -- with partial declaration. | |
4859 | ||
4860 | if Is_Access_Type (New_Discr_Type) | |
4861 | and then Null_Exclusion_Present (New_Discr) | |
4862 | then | |
4863 | New_Discr_Type := | |
4864 | Create_Null_Excluding_Itype | |
4865 | (T => New_Discr_Type, | |
4866 | Related_Nod => New_Discr, | |
4867 | Scope_Id => Current_Scope); | |
4868 | end if; | |
996ae0b0 RK |
4869 | end if; |
4870 | ||
4871 | if not Conforming_Types | |
4872 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
4873 | then | |
4874 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
4875 | return; | |
fbf5a39b | 4876 | else |
82c80734 RD |
4877 | -- Treat the new discriminant as an occurrence of the old one, |
4878 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
4879 | -- information, for completeness. |
4880 | ||
4881 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
4882 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
4883 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
4884 | end if; |
4885 | ||
4886 | -- Names must match | |
4887 | ||
4888 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
4889 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
4890 | return; | |
4891 | end if; | |
4892 | ||
4893 | -- Default expressions must match | |
4894 | ||
4895 | declare | |
4896 | NewD : constant Boolean := | |
4897 | Present (Expression (New_Discr)); | |
4898 | OldD : constant Boolean := | |
4899 | Present (Expression (Parent (Old_Discr))); | |
4900 | ||
4901 | begin | |
4902 | if NewD or OldD then | |
4903 | ||
4904 | -- The old default value has been analyzed and expanded, | |
4905 | -- because the current full declaration will have frozen | |
82c80734 RD |
4906 | -- everything before. The new default values have not been |
4907 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
4908 | |
4909 | if NewD then | |
21d27997 | 4910 | Preanalyze_Spec_Expression |
996ae0b0 RK |
4911 | (Expression (New_Discr), New_Discr_Type); |
4912 | end if; | |
4913 | ||
4914 | if not (NewD and OldD) | |
4915 | or else not Fully_Conformant_Expressions | |
4916 | (Expression (Parent (Old_Discr)), | |
4917 | Expression (New_Discr)) | |
4918 | ||
4919 | then | |
4920 | Conformance_Error | |
4921 | ("default expression for & does not match!", | |
4922 | New_Discr_Id); | |
4923 | return; | |
4924 | end if; | |
4925 | end if; | |
4926 | end; | |
4927 | ||
4928 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
4929 | ||
0ab80019 | 4930 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
4931 | declare |
4932 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
4933 | ||
4934 | begin | |
4935 | -- Grouping (use of comma in param lists) must be the same | |
4936 | -- This is where we catch a misconformance like: | |
4937 | ||
60370fb1 | 4938 | -- A, B : Integer |
996ae0b0 RK |
4939 | -- A : Integer; B : Integer |
4940 | ||
4941 | -- which are represented identically in the tree except | |
4942 | -- for the setting of the flags More_Ids and Prev_Ids. | |
4943 | ||
4944 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
4945 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
4946 | then | |
4947 | Conformance_Error | |
4948 | ("grouping of & does not match!", New_Discr_Id); | |
4949 | return; | |
4950 | end if; | |
4951 | end; | |
4952 | end if; | |
4953 | ||
4954 | Next_Discriminant (Old_Discr); | |
4955 | Next (New_Discr); | |
4956 | end loop; | |
4957 | ||
4958 | if Present (Old_Discr) then | |
4959 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
4960 | return; | |
4961 | ||
4962 | elsif Present (New_Discr) then | |
4963 | Conformance_Error | |
4964 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
4965 | return; | |
4966 | end if; | |
4967 | end Check_Discriminant_Conformance; | |
4968 | ||
4969 | ---------------------------- | |
4970 | -- Check_Fully_Conformant -- | |
4971 | ---------------------------- | |
4972 | ||
4973 | procedure Check_Fully_Conformant | |
4974 | (New_Id : Entity_Id; | |
4975 | Old_Id : Entity_Id; | |
4976 | Err_Loc : Node_Id := Empty) | |
4977 | is | |
4978 | Result : Boolean; | |
81db9d77 | 4979 | pragma Warnings (Off, Result); |
996ae0b0 RK |
4980 | begin |
4981 | Check_Conformance | |
4982 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
4983 | end Check_Fully_Conformant; | |
4984 | ||
4985 | --------------------------- | |
4986 | -- Check_Mode_Conformant -- | |
4987 | --------------------------- | |
4988 | ||
4989 | procedure Check_Mode_Conformant | |
4990 | (New_Id : Entity_Id; | |
4991 | Old_Id : Entity_Id; | |
4992 | Err_Loc : Node_Id := Empty; | |
4993 | Get_Inst : Boolean := False) | |
4994 | is | |
4995 | Result : Boolean; | |
81db9d77 | 4996 | pragma Warnings (Off, Result); |
996ae0b0 RK |
4997 | begin |
4998 | Check_Conformance | |
4999 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
5000 | end Check_Mode_Conformant; | |
5001 | ||
fbf5a39b | 5002 | -------------------------------- |
758c442c | 5003 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
5004 | -------------------------------- |
5005 | ||
758c442c | 5006 | procedure Check_Overriding_Indicator |
ec4867fa | 5007 | (Subp : Entity_Id; |
5d37ba92 ES |
5008 | Overridden_Subp : Entity_Id; |
5009 | Is_Primitive : Boolean) | |
fbf5a39b | 5010 | is |
758c442c GD |
5011 | Decl : Node_Id; |
5012 | Spec : Node_Id; | |
fbf5a39b AC |
5013 | |
5014 | begin | |
ec4867fa | 5015 | -- No overriding indicator for literals |
fbf5a39b | 5016 | |
ec4867fa | 5017 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 5018 | return; |
fbf5a39b | 5019 | |
ec4867fa ES |
5020 | elsif Ekind (Subp) = E_Entry then |
5021 | Decl := Parent (Subp); | |
5022 | ||
53b10ce9 AC |
5023 | -- No point in analyzing a malformed operator |
5024 | ||
5025 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
5026 | and then Error_Posted (Subp) | |
5027 | then | |
5028 | return; | |
5029 | ||
758c442c GD |
5030 | else |
5031 | Decl := Unit_Declaration_Node (Subp); | |
5032 | end if; | |
fbf5a39b | 5033 | |
800621e0 RD |
5034 | if Nkind_In (Decl, N_Subprogram_Body, |
5035 | N_Subprogram_Body_Stub, | |
5036 | N_Subprogram_Declaration, | |
5037 | N_Abstract_Subprogram_Declaration, | |
5038 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
5039 | then |
5040 | Spec := Specification (Decl); | |
ec4867fa ES |
5041 | |
5042 | elsif Nkind (Decl) = N_Entry_Declaration then | |
5043 | Spec := Decl; | |
5044 | ||
758c442c GD |
5045 | else |
5046 | return; | |
5047 | end if; | |
fbf5a39b | 5048 | |
e7d72fb9 AC |
5049 | -- The overriding operation is type conformant with the overridden one, |
5050 | -- but the names of the formals are not required to match. If the names | |
6823270c | 5051 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
5052 | -- source of confusion that is worth diagnosing. Controlling formals |
5053 | -- often carry names that reflect the type, and it is not worthwhile | |
5054 | -- requiring that their names match. | |
5055 | ||
c9e7bd8e | 5056 | if Present (Overridden_Subp) |
e7d72fb9 AC |
5057 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
5058 | then | |
5059 | declare | |
5060 | Form1 : Entity_Id; | |
5061 | Form2 : Entity_Id; | |
5062 | ||
5063 | begin | |
5064 | Form1 := First_Formal (Subp); | |
5065 | Form2 := First_Formal (Overridden_Subp); | |
5066 | ||
c9e7bd8e AC |
5067 | -- If the overriding operation is a synchronized operation, skip |
5068 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
5069 | -- implicit in the new one. If the operation is declared in the |
5070 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 5071 | |
6823270c AC |
5072 | if Is_Concurrent_Type (Scope (Subp)) |
5073 | and then Is_Tagged_Type (Scope (Subp)) | |
5074 | and then not Has_Completion (Scope (Subp)) | |
5075 | then | |
c9e7bd8e AC |
5076 | Form2 := Next_Formal (Form2); |
5077 | end if; | |
5078 | ||
e7d72fb9 AC |
5079 | if Present (Form1) then |
5080 | Form1 := Next_Formal (Form1); | |
5081 | Form2 := Next_Formal (Form2); | |
5082 | end if; | |
5083 | ||
5084 | while Present (Form1) loop | |
5085 | if not Is_Controlling_Formal (Form1) | |
5086 | and then Present (Next_Formal (Form2)) | |
5087 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
5088 | then | |
5089 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
5090 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 5091 | Error_Msg_NE |
19d846a0 | 5092 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
5093 | Form1, Form1); |
5094 | exit; | |
5095 | end if; | |
5096 | ||
5097 | Next_Formal (Form1); | |
5098 | Next_Formal (Form2); | |
5099 | end loop; | |
5100 | end; | |
5101 | end if; | |
5102 | ||
676e8420 AC |
5103 | -- If there is an overridden subprogram, then check that there is no |
5104 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
5105 | -- This is not done if the overridden subprogram is marked as hidden, |
5106 | -- which can occur for the case of inherited controlled operations | |
5107 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
5108 | -- subprogram is not itself hidden. (Note: This condition could probably | |
5109 | -- be simplified, leaving out the testing for the specific controlled | |
5110 | -- cases, but it seems safer and clearer this way, and echoes similar | |
5111 | -- special-case tests of this kind in other places.) | |
5112 | ||
fd0d899b | 5113 | if Present (Overridden_Subp) |
51bf9bdf AC |
5114 | and then (not Is_Hidden (Overridden_Subp) |
5115 | or else | |
5116 | ((Chars (Overridden_Subp) = Name_Initialize | |
f0709ca6 AC |
5117 | or else |
5118 | Chars (Overridden_Subp) = Name_Adjust | |
5119 | or else | |
5120 | Chars (Overridden_Subp) = Name_Finalize) | |
5121 | and then Present (Alias (Overridden_Subp)) | |
5122 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 5123 | then |
ec4867fa ES |
5124 | if Must_Not_Override (Spec) then |
5125 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 5126 | |
ec4867fa | 5127 | if Ekind (Subp) = E_Entry then |
ed2233dc | 5128 | Error_Msg_NE |
5d37ba92 | 5129 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5130 | else |
ed2233dc | 5131 | Error_Msg_NE |
5d37ba92 | 5132 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 5133 | end if; |
21d27997 | 5134 | |
bd603506 | 5135 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
5136 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
5137 | -- operation. This operation should not be inherited by other limited | |
5138 | -- controlled types. An explicit Adjust for them is not overriding. | |
5139 | ||
5140 | elsif Must_Override (Spec) | |
5141 | and then Chars (Overridden_Subp) = Name_Adjust | |
5142 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
5143 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
5144 | and then |
5145 | Is_Predefined_File_Name | |
5146 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
5147 | then |
5148 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5149 | ||
21d27997 | 5150 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
5151 | if Is_Init_Proc (Subp) then |
5152 | null; | |
5153 | ||
5154 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
5155 | |
5156 | -- For entities generated by Derive_Subprograms the overridden | |
5157 | -- operation is the inherited primitive (which is available | |
5158 | -- through the attribute alias) | |
5159 | ||
5160 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 5161 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 5162 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
5163 | and then Find_Dispatching_Type (Overridden_Subp) = |
5164 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
5165 | and then Present (Alias (Overridden_Subp)) |
5166 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
5167 | then | |
5168 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 5169 | |
1c1289e7 AC |
5170 | else |
5171 | Set_Overridden_Operation (Subp, Overridden_Subp); | |
5172 | end if; | |
5173 | end if; | |
ec4867fa | 5174 | end if; |
f937473f | 5175 | |
618fb570 AC |
5176 | -- If primitive flag is set or this is a protected operation, then |
5177 | -- the operation is overriding at the point of its declaration, so | |
5178 | -- warn if necessary. Otherwise it may have been declared before the | |
5179 | -- operation it overrides and no check is required. | |
3c25856a AC |
5180 | |
5181 | if Style_Check | |
618fb570 AC |
5182 | and then not Must_Override (Spec) |
5183 | and then (Is_Primitive | |
5184 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 5185 | then |
235f4375 AC |
5186 | Style.Missing_Overriding (Decl, Subp); |
5187 | end if; | |
5188 | ||
53b10ce9 AC |
5189 | -- If Subp is an operator, it may override a predefined operation, if |
5190 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 5191 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
5192 | -- representation for predefined operators. We have to check whether the |
5193 | -- signature of Subp matches that of a predefined operator. Note that | |
5194 | -- first argument provides the name of the operator, and the second | |
5195 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
5196 | -- If the indicator is overriding, then the operator must match a |
5197 | -- predefined signature, because we know already that there is no | |
5198 | -- explicit overridden operation. | |
f937473f | 5199 | |
21d27997 | 5200 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 5201 | if Must_Not_Override (Spec) then |
f937473f | 5202 | |
806f6d37 AC |
5203 | -- If this is not a primitive or a protected subprogram, then |
5204 | -- "not overriding" is illegal. | |
618fb570 | 5205 | |
806f6d37 AC |
5206 | if not Is_Primitive |
5207 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5208 | then | |
5209 | Error_Msg_N | |
5210 | ("overriding indicator only allowed " | |
5211 | & "if subprogram is primitive", Subp); | |
618fb570 | 5212 | |
806f6d37 AC |
5213 | elsif Can_Override_Operator (Subp) then |
5214 | Error_Msg_NE | |
5215 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
5216 | end if; | |
f937473f | 5217 | |
806f6d37 AC |
5218 | elsif Must_Override (Spec) then |
5219 | if No (Overridden_Operation (Subp)) | |
5220 | and then not Can_Override_Operator (Subp) | |
5221 | then | |
5222 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
5223 | end if; | |
5d37ba92 | 5224 | |
806f6d37 AC |
5225 | elsif not Error_Posted (Subp) |
5226 | and then Style_Check | |
5227 | and then Can_Override_Operator (Subp) | |
5228 | and then | |
5229 | not Is_Predefined_File_Name | |
5230 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
5231 | then | |
5232 | -- If style checks are enabled, indicate that the indicator is | |
5233 | -- missing. However, at the point of declaration, the type of | |
5234 | -- which this is a primitive operation may be private, in which | |
5235 | -- case the indicator would be premature. | |
235f4375 | 5236 | |
806f6d37 AC |
5237 | if Has_Private_Declaration (Etype (Subp)) |
5238 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 5239 | then |
806f6d37 AC |
5240 | null; |
5241 | else | |
5242 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 5243 | end if; |
806f6d37 | 5244 | end if; |
21d27997 RD |
5245 | |
5246 | elsif Must_Override (Spec) then | |
5247 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 5248 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 5249 | else |
ed2233dc | 5250 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 5251 | end if; |
5d37ba92 ES |
5252 | |
5253 | -- If the operation is marked "not overriding" and it's not primitive | |
5254 | -- then an error is issued, unless this is an operation of a task or | |
5255 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
5256 | -- has been specified have already been checked above. | |
5257 | ||
5258 | elsif Must_Not_Override (Spec) | |
5259 | and then not Is_Primitive | |
5260 | and then Ekind (Subp) /= E_Entry | |
5261 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
5262 | then | |
ed2233dc | 5263 | Error_Msg_N |
5d37ba92 ES |
5264 | ("overriding indicator only allowed if subprogram is primitive", |
5265 | Subp); | |
5d37ba92 | 5266 | return; |
fbf5a39b | 5267 | end if; |
758c442c | 5268 | end Check_Overriding_Indicator; |
fbf5a39b | 5269 | |
996ae0b0 RK |
5270 | ------------------- |
5271 | -- Check_Returns -- | |
5272 | ------------------- | |
5273 | ||
0a36105d JM |
5274 | -- Note: this procedure needs to know far too much about how the expander |
5275 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
5276 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
5277 | -- works, but is not very clean. It would be better if the expansion | |
5278 | -- routines would leave Original_Node working nicely, and we could use | |
5279 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
5280 | ||
996ae0b0 RK |
5281 | procedure Check_Returns |
5282 | (HSS : Node_Id; | |
5283 | Mode : Character; | |
c8ef728f ES |
5284 | Err : out Boolean; |
5285 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
5286 | is |
5287 | Handler : Node_Id; | |
5288 | ||
5289 | procedure Check_Statement_Sequence (L : List_Id); | |
5290 | -- Internal recursive procedure to check a list of statements for proper | |
5291 | -- termination by a return statement (or a transfer of control or a | |
5292 | -- compound statement that is itself internally properly terminated). | |
5293 | ||
5294 | ------------------------------ | |
5295 | -- Check_Statement_Sequence -- | |
5296 | ------------------------------ | |
5297 | ||
5298 | procedure Check_Statement_Sequence (L : List_Id) is | |
5299 | Last_Stm : Node_Id; | |
0a36105d | 5300 | Stm : Node_Id; |
996ae0b0 RK |
5301 | Kind : Node_Kind; |
5302 | ||
5303 | Raise_Exception_Call : Boolean; | |
5304 | -- Set True if statement sequence terminated by Raise_Exception call | |
5305 | -- or a Reraise_Occurrence call. | |
5306 | ||
5307 | begin | |
5308 | Raise_Exception_Call := False; | |
5309 | ||
5310 | -- Get last real statement | |
5311 | ||
5312 | Last_Stm := Last (L); | |
5313 | ||
0a36105d JM |
5314 | -- Deal with digging out exception handler statement sequences that |
5315 | -- have been transformed by the local raise to goto optimization. | |
5316 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
5317 | -- optimization has occurred, we are looking at something like: | |
5318 | ||
5319 | -- begin | |
5320 | -- original stmts in block | |
5321 | ||
5322 | -- exception \ | |
5323 | -- when excep1 => | | |
5324 | -- goto L1; | omitted if No_Exception_Propagation | |
5325 | -- when excep2 => | | |
5326 | -- goto L2; / | |
5327 | -- end; | |
5328 | ||
5329 | -- goto L3; -- skip handler when exception not raised | |
5330 | ||
5331 | -- <<L1>> -- target label for local exception | |
5332 | -- begin | |
5333 | -- estmts1 | |
5334 | -- end; | |
5335 | ||
5336 | -- goto L3; | |
5337 | ||
5338 | -- <<L2>> | |
5339 | -- begin | |
5340 | -- estmts2 | |
5341 | -- end; | |
5342 | ||
5343 | -- <<L3>> | |
5344 | ||
5345 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
5346 | -- sequences (which were the original sequences of statements in | |
5347 | -- the exception handlers) and check them. | |
5348 | ||
5349 | if Nkind (Last_Stm) = N_Label | |
5350 | and then Exception_Junk (Last_Stm) | |
5351 | then | |
5352 | Stm := Last_Stm; | |
5353 | loop | |
5354 | Prev (Stm); | |
5355 | exit when No (Stm); | |
5356 | exit when Nkind (Stm) /= N_Block_Statement; | |
5357 | exit when not Exception_Junk (Stm); | |
5358 | Prev (Stm); | |
5359 | exit when No (Stm); | |
5360 | exit when Nkind (Stm) /= N_Label; | |
5361 | exit when not Exception_Junk (Stm); | |
5362 | Check_Statement_Sequence | |
5363 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
5364 | ||
5365 | Prev (Stm); | |
5366 | Last_Stm := Stm; | |
5367 | exit when No (Stm); | |
5368 | exit when Nkind (Stm) /= N_Goto_Statement; | |
5369 | exit when not Exception_Junk (Stm); | |
5370 | end loop; | |
5371 | end if; | |
5372 | ||
996ae0b0 RK |
5373 | -- Don't count pragmas |
5374 | ||
5375 | while Nkind (Last_Stm) = N_Pragma | |
5376 | ||
5377 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
5378 | ||
5379 | or else | |
5380 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
5381 | and then | |
5382 | Nkind (Name (Last_Stm)) = N_Identifier | |
5383 | and then | |
5384 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
5385 | ||
5386 | -- Don't count exception junk | |
5387 | ||
5388 | or else | |
800621e0 RD |
5389 | (Nkind_In (Last_Stm, N_Goto_Statement, |
5390 | N_Label, | |
5391 | N_Object_Declaration) | |
0a36105d JM |
5392 | and then Exception_Junk (Last_Stm)) |
5393 | or else Nkind (Last_Stm) in N_Push_xxx_Label | |
5394 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
996ae0b0 RK |
5395 | loop |
5396 | Prev (Last_Stm); | |
5397 | end loop; | |
5398 | ||
5399 | -- Here we have the "real" last statement | |
5400 | ||
5401 | Kind := Nkind (Last_Stm); | |
5402 | ||
5403 | -- Transfer of control, OK. Note that in the No_Return procedure | |
5404 | -- case, we already diagnosed any explicit return statements, so | |
5405 | -- we can treat them as OK in this context. | |
5406 | ||
5407 | if Is_Transfer (Last_Stm) then | |
5408 | return; | |
5409 | ||
5410 | -- Check cases of explicit non-indirect procedure calls | |
5411 | ||
5412 | elsif Kind = N_Procedure_Call_Statement | |
5413 | and then Is_Entity_Name (Name (Last_Stm)) | |
5414 | then | |
5415 | -- Check call to Raise_Exception procedure which is treated | |
5416 | -- specially, as is a call to Reraise_Occurrence. | |
5417 | ||
5418 | -- We suppress the warning in these cases since it is likely that | |
5419 | -- the programmer really does not expect to deal with the case | |
5420 | -- of Null_Occurrence, and thus would find a warning about a | |
5421 | -- missing return curious, and raising Program_Error does not | |
5422 | -- seem such a bad behavior if this does occur. | |
5423 | ||
c8ef728f ES |
5424 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
5425 | -- behavior will be to raise Constraint_Error (see AI-329). | |
5426 | ||
996ae0b0 RK |
5427 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
5428 | or else | |
5429 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
5430 | then | |
5431 | Raise_Exception_Call := True; | |
5432 | ||
5433 | -- For Raise_Exception call, test first argument, if it is | |
5434 | -- an attribute reference for a 'Identity call, then we know | |
5435 | -- that the call cannot possibly return. | |
5436 | ||
5437 | declare | |
5438 | Arg : constant Node_Id := | |
5439 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
5440 | begin |
5441 | if Nkind (Arg) = N_Attribute_Reference | |
5442 | and then Attribute_Name (Arg) = Name_Identity | |
5443 | then | |
5444 | return; | |
5445 | end if; | |
5446 | end; | |
5447 | end if; | |
5448 | ||
5449 | -- If statement, need to look inside if there is an else and check | |
5450 | -- each constituent statement sequence for proper termination. | |
5451 | ||
5452 | elsif Kind = N_If_Statement | |
5453 | and then Present (Else_Statements (Last_Stm)) | |
5454 | then | |
5455 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
5456 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
5457 | ||
5458 | if Present (Elsif_Parts (Last_Stm)) then | |
5459 | declare | |
5460 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
5461 | ||
5462 | begin | |
5463 | while Present (Elsif_Part) loop | |
5464 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
5465 | Next (Elsif_Part); | |
5466 | end loop; | |
5467 | end; | |
5468 | end if; | |
5469 | ||
5470 | return; | |
5471 | ||
5472 | -- Case statement, check each case for proper termination | |
5473 | ||
5474 | elsif Kind = N_Case_Statement then | |
5475 | declare | |
5476 | Case_Alt : Node_Id; | |
996ae0b0 RK |
5477 | begin |
5478 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
5479 | while Present (Case_Alt) loop | |
5480 | Check_Statement_Sequence (Statements (Case_Alt)); | |
5481 | Next_Non_Pragma (Case_Alt); | |
5482 | end loop; | |
5483 | end; | |
5484 | ||
5485 | return; | |
5486 | ||
5487 | -- Block statement, check its handled sequence of statements | |
5488 | ||
5489 | elsif Kind = N_Block_Statement then | |
5490 | declare | |
5491 | Err1 : Boolean; | |
5492 | ||
5493 | begin | |
5494 | Check_Returns | |
5495 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
5496 | ||
5497 | if Err1 then | |
5498 | Err := True; | |
5499 | end if; | |
5500 | ||
5501 | return; | |
5502 | end; | |
5503 | ||
5504 | -- Loop statement. If there is an iteration scheme, we can definitely | |
5505 | -- fall out of the loop. Similarly if there is an exit statement, we | |
5506 | -- can fall out. In either case we need a following return. | |
5507 | ||
5508 | elsif Kind = N_Loop_Statement then | |
5509 | if Present (Iteration_Scheme (Last_Stm)) | |
5510 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
5511 | then | |
5512 | null; | |
5513 | ||
f3d57416 RW |
5514 | -- A loop with no exit statement or iteration scheme is either |
5515 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
5516 | -- In either case, no warning is required. |
5517 | ||
5518 | else | |
5519 | return; | |
5520 | end if; | |
5521 | ||
5522 | -- Timed entry call, check entry call and delay alternatives | |
5523 | ||
5524 | -- Note: in expanded code, the timed entry call has been converted | |
5525 | -- to a set of expanded statements on which the check will work | |
5526 | -- correctly in any case. | |
5527 | ||
5528 | elsif Kind = N_Timed_Entry_Call then | |
5529 | declare | |
5530 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
5531 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
5532 | ||
5533 | begin | |
5534 | -- If statement sequence of entry call alternative is missing, | |
5535 | -- then we can definitely fall through, and we post the error | |
5536 | -- message on the entry call alternative itself. | |
5537 | ||
5538 | if No (Statements (ECA)) then | |
5539 | Last_Stm := ECA; | |
5540 | ||
5541 | -- If statement sequence of delay alternative is missing, then | |
5542 | -- we can definitely fall through, and we post the error | |
5543 | -- message on the delay alternative itself. | |
5544 | ||
5545 | -- Note: if both ECA and DCA are missing the return, then we | |
5546 | -- post only one message, should be enough to fix the bugs. | |
5547 | -- If not we will get a message next time on the DCA when the | |
5548 | -- ECA is fixed! | |
5549 | ||
5550 | elsif No (Statements (DCA)) then | |
5551 | Last_Stm := DCA; | |
5552 | ||
5553 | -- Else check both statement sequences | |
5554 | ||
5555 | else | |
5556 | Check_Statement_Sequence (Statements (ECA)); | |
5557 | Check_Statement_Sequence (Statements (DCA)); | |
5558 | return; | |
5559 | end if; | |
5560 | end; | |
5561 | ||
5562 | -- Conditional entry call, check entry call and else part | |
5563 | ||
5564 | -- Note: in expanded code, the conditional entry call has been | |
5565 | -- converted to a set of expanded statements on which the check | |
5566 | -- will work correctly in any case. | |
5567 | ||
5568 | elsif Kind = N_Conditional_Entry_Call then | |
5569 | declare | |
5570 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
5571 | ||
5572 | begin | |
5573 | -- If statement sequence of entry call alternative is missing, | |
5574 | -- then we can definitely fall through, and we post the error | |
5575 | -- message on the entry call alternative itself. | |
5576 | ||
5577 | if No (Statements (ECA)) then | |
5578 | Last_Stm := ECA; | |
5579 | ||
5580 | -- Else check statement sequence and else part | |
5581 | ||
5582 | else | |
5583 | Check_Statement_Sequence (Statements (ECA)); | |
5584 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
5585 | return; | |
5586 | end if; | |
5587 | end; | |
5588 | end if; | |
5589 | ||
5590 | -- If we fall through, issue appropriate message | |
5591 | ||
5592 | if Mode = 'F' then | |
996ae0b0 RK |
5593 | if not Raise_Exception_Call then |
5594 | Error_Msg_N | |
5d37ba92 | 5595 | ("?RETURN statement missing following this statement!", |
996ae0b0 RK |
5596 | Last_Stm); |
5597 | Error_Msg_N | |
5d37ba92 | 5598 | ("\?Program_Error may be raised at run time!", |
996ae0b0 RK |
5599 | Last_Stm); |
5600 | end if; | |
5601 | ||
5602 | -- Note: we set Err even though we have not issued a warning | |
5603 | -- because we still have a case of a missing return. This is | |
5604 | -- an extremely marginal case, probably will never be noticed | |
5605 | -- but we might as well get it right. | |
5606 | ||
5607 | Err := True; | |
5608 | ||
c8ef728f ES |
5609 | -- Otherwise we have the case of a procedure marked No_Return |
5610 | ||
996ae0b0 | 5611 | else |
800621e0 RD |
5612 | if not Raise_Exception_Call then |
5613 | Error_Msg_N | |
5614 | ("?implied return after this statement " & | |
5615 | "will raise Program_Error", | |
5616 | Last_Stm); | |
5617 | Error_Msg_NE | |
5618 | ("\?procedure & is marked as No_Return!", | |
5619 | Last_Stm, Proc); | |
5620 | end if; | |
c8ef728f ES |
5621 | |
5622 | declare | |
5623 | RE : constant Node_Id := | |
5624 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
5625 | Reason => PE_Implicit_Return); | |
5626 | begin | |
5627 | Insert_After (Last_Stm, RE); | |
5628 | Analyze (RE); | |
5629 | end; | |
996ae0b0 RK |
5630 | end if; |
5631 | end Check_Statement_Sequence; | |
5632 | ||
5633 | -- Start of processing for Check_Returns | |
5634 | ||
5635 | begin | |
5636 | Err := False; | |
5637 | Check_Statement_Sequence (Statements (HSS)); | |
5638 | ||
5639 | if Present (Exception_Handlers (HSS)) then | |
5640 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
5641 | while Present (Handler) loop | |
5642 | Check_Statement_Sequence (Statements (Handler)); | |
5643 | Next_Non_Pragma (Handler); | |
5644 | end loop; | |
5645 | end if; | |
5646 | end Check_Returns; | |
5647 | ||
67c86178 AC |
5648 | ------------------------------- |
5649 | -- Check_Subprogram_Contract -- | |
5650 | ------------------------------- | |
5651 | ||
5652 | procedure Check_Subprogram_Contract (Spec_Id : Entity_Id) is | |
5653 | ||
029b67ba YM |
5654 | -- Code is currently commented out as, in some cases, it causes crashes |
5655 | -- because Direct_Primitive_Operations is not available for a private | |
5656 | -- type. This may cause more warnings to be issued than necessary. See | |
5657 | -- below for the intended use of this variable. ??? | |
5658 | ||
67c86178 AC |
5659 | -- Inherited : constant Subprogram_List := |
5660 | -- Inherited_Subprograms (Spec_Id); | |
dc36a7e3 | 5661 | -- -- List of subprograms inherited by this subprogram |
67c86178 | 5662 | |
dc36a7e3 | 5663 | Last_Postcondition : Node_Id := Empty; |
67c86178 AC |
5664 | -- Last postcondition on the subprogram, or else Empty if either no |
5665 | -- postcondition or only inherited postconditions. | |
5666 | ||
5667 | Attribute_Result_Mentioned : Boolean := False; | |
5668 | -- Whether attribute 'Result is mentioned in a postcondition | |
5669 | ||
dc36a7e3 | 5670 | Post_State_Mentioned : Boolean := False; |
67c86178 AC |
5671 | -- Whether some expression mentioned in a postcondition can have a |
5672 | -- different value in the post-state than in the pre-state. | |
5673 | ||
5674 | function Check_Attr_Result (N : Node_Id) return Traverse_Result; | |
dc36a7e3 RD |
5675 | -- Check if N is a reference to the attribute 'Result, and if so set |
5676 | -- Attribute_Result_Mentioned and return Abandon. Otherwise return OK. | |
67c86178 AC |
5677 | |
5678 | function Check_Post_State (N : Node_Id) return Traverse_Result; | |
5679 | -- Check whether the value of evaluating N can be different in the | |
5680 | -- post-state, compared to the same evaluation in the pre-state, and | |
5681 | -- if so set Post_State_Mentioned and return Abandon. Return Skip on | |
5682 | -- reference to attribute 'Old, in order to ignore its prefix, which | |
5683 | -- is precisely evaluated in the pre-state. Otherwise return OK. | |
5684 | ||
dc36a7e3 | 5685 | procedure Process_Post_Conditions (Spec : Node_Id; Class : Boolean); |
67c86178 AC |
5686 | -- This processes the Spec_PPC_List from Spec, processing any |
5687 | -- postconditions from the list. If Class is True, then only | |
5688 | -- postconditions marked with Class_Present are considered. The | |
5689 | -- caller has checked that Spec_PPC_List is non-Empty. | |
5690 | ||
5691 | function Find_Attribute_Result is new Traverse_Func (Check_Attr_Result); | |
5692 | ||
5693 | function Find_Post_State is new Traverse_Func (Check_Post_State); | |
5694 | ||
5695 | ----------------------- | |
5696 | -- Check_Attr_Result -- | |
5697 | ----------------------- | |
5698 | ||
5699 | function Check_Attr_Result (N : Node_Id) return Traverse_Result is | |
5700 | begin | |
5701 | if Nkind (N) = N_Attribute_Reference | |
dc36a7e3 | 5702 | and then Get_Attribute_Id (Attribute_Name (N)) = Attribute_Result |
67c86178 AC |
5703 | then |
5704 | Attribute_Result_Mentioned := True; | |
5705 | return Abandon; | |
5706 | else | |
5707 | return OK; | |
5708 | end if; | |
5709 | end Check_Attr_Result; | |
5710 | ||
5711 | ---------------------- | |
5712 | -- Check_Post_State -- | |
5713 | ---------------------- | |
5714 | ||
5715 | function Check_Post_State (N : Node_Id) return Traverse_Result is | |
5716 | Found : Boolean := False; | |
5717 | ||
5718 | begin | |
5719 | case Nkind (N) is | |
5720 | when N_Function_Call | | |
5721 | N_Explicit_Dereference => | |
5722 | Found := True; | |
5723 | ||
5724 | when N_Identifier | | |
5725 | N_Expanded_Name => | |
dc36a7e3 | 5726 | |
67c86178 AC |
5727 | declare |
5728 | E : constant Entity_Id := Entity (N); | |
bd38b431 | 5729 | |
67c86178 | 5730 | begin |
bd38b431 AC |
5731 | -- ???Quantified expressions get analyzed later, so E can |
5732 | -- be empty at this point. In this case, we suppress the | |
5b5588dd AC |
5733 | -- warning, just in case E is assignable. It seems better to |
5734 | -- have false negatives than false positives. At some point, | |
5735 | -- we should make the warning more accurate, either by | |
bd38b431 AC |
5736 | -- analyzing quantified expressions earlier, or moving |
5737 | -- this processing later. | |
5b5588dd | 5738 | |
bd38b431 AC |
5739 | if No (E) |
5740 | or else | |
5741 | (Is_Entity_Name (N) | |
5742 | and then Ekind (E) in Assignable_Kind) | |
67c86178 AC |
5743 | then |
5744 | Found := True; | |
5745 | end if; | |
5746 | end; | |
5747 | ||
5748 | when N_Attribute_Reference => | |
5749 | case Get_Attribute_Id (Attribute_Name (N)) is | |
5750 | when Attribute_Old => | |
5751 | return Skip; | |
5752 | when Attribute_Result => | |
5753 | Found := True; | |
5754 | when others => | |
5755 | null; | |
5756 | end case; | |
5757 | ||
5758 | when others => | |
5759 | null; | |
5760 | end case; | |
5761 | ||
5762 | if Found then | |
5763 | Post_State_Mentioned := True; | |
5764 | return Abandon; | |
5765 | else | |
5766 | return OK; | |
5767 | end if; | |
5768 | end Check_Post_State; | |
5769 | ||
5770 | ----------------------------- | |
5771 | -- Process_Post_Conditions -- | |
5772 | ----------------------------- | |
5773 | ||
5774 | procedure Process_Post_Conditions | |
5775 | (Spec : Node_Id; | |
5776 | Class : Boolean) | |
5777 | is | |
5778 | Prag : Node_Id; | |
5779 | Arg : Node_Id; | |
5780 | Ignored : Traverse_Final_Result; | |
5781 | pragma Unreferenced (Ignored); | |
5782 | ||
5783 | begin | |
5784 | Prag := Spec_PPC_List (Contract (Spec)); | |
5785 | ||
5786 | loop | |
5787 | Arg := First (Pragma_Argument_Associations (Prag)); | |
5788 | ||
dc36a7e3 | 5789 | -- Since pre- and post-conditions are listed in reverse order, the |
67c86178 AC |
5790 | -- first postcondition in the list is the last in the source. |
5791 | ||
5792 | if Pragma_Name (Prag) = Name_Postcondition | |
5793 | and then not Class | |
5794 | and then No (Last_Postcondition) | |
5795 | then | |
5796 | Last_Postcondition := Prag; | |
5797 | end if; | |
5798 | ||
5799 | -- For functions, look for presence of 'Result in postcondition | |
5800 | ||
5801 | if Ekind_In (Spec_Id, E_Function, E_Generic_Function) then | |
5802 | Ignored := Find_Attribute_Result (Arg); | |
5803 | end if; | |
5804 | ||
5805 | -- For each individual non-inherited postcondition, look for | |
5806 | -- presence of an expression that could be evaluated differently | |
5807 | -- in post-state. | |
5808 | ||
5809 | if Pragma_Name (Prag) = Name_Postcondition | |
5810 | and then not Class | |
5811 | then | |
5812 | Post_State_Mentioned := False; | |
dc36a7e3 | 5813 | Ignored := Find_Post_State (Arg); |
67c86178 AC |
5814 | |
5815 | if not Post_State_Mentioned then | |
5b5588dd | 5816 | Error_Msg_N ("?postcondition refers only to pre-state", |
67c86178 AC |
5817 | Prag); |
5818 | end if; | |
5819 | end if; | |
5820 | ||
5821 | Prag := Next_Pragma (Prag); | |
5822 | exit when No (Prag); | |
5823 | end loop; | |
5824 | end Process_Post_Conditions; | |
5825 | ||
5826 | -- Start of processing for Check_Subprogram_Contract | |
5827 | ||
5828 | begin | |
5829 | if not Warn_On_Suspicious_Contract then | |
5830 | return; | |
5831 | end if; | |
5832 | ||
5833 | if Present (Spec_PPC_List (Contract (Spec_Id))) then | |
5834 | Process_Post_Conditions (Spec_Id, Class => False); | |
5835 | end if; | |
5836 | ||
5837 | -- Process inherited postconditions | |
5838 | ||
5839 | -- Code is currently commented out as, in some cases, it causes crashes | |
5840 | -- because Direct_Primitive_Operations is not available for a private | |
dc36a7e3 | 5841 | -- type. This may cause more warnings to be issued than necessary. ??? |
67c86178 AC |
5842 | |
5843 | -- for J in Inherited'Range loop | |
5844 | -- if Present (Spec_PPC_List (Contract (Inherited (J)))) then | |
5845 | -- Process_Post_Conditions (Inherited (J), Class => True); | |
5846 | -- end if; | |
5847 | -- end loop; | |
5848 | ||
5849 | -- Issue warning for functions whose postcondition does not mention | |
5850 | -- 'Result after all postconditions have been processed. | |
5851 | ||
5852 | if Ekind_In (Spec_Id, E_Function, E_Generic_Function) | |
5853 | and then Present (Last_Postcondition) | |
5854 | and then not Attribute_Result_Mentioned | |
5855 | then | |
5856 | Error_Msg_N ("?function postcondition does not mention result", | |
5857 | Last_Postcondition); | |
5858 | end if; | |
5859 | end Check_Subprogram_Contract; | |
5860 | ||
996ae0b0 RK |
5861 | ---------------------------- |
5862 | -- Check_Subprogram_Order -- | |
5863 | ---------------------------- | |
5864 | ||
5865 | procedure Check_Subprogram_Order (N : Node_Id) is | |
5866 | ||
5867 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
5868 | -- This is used to check if S1 > S2 in the sense required by this test, |
5869 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 5870 | |
82c80734 RD |
5871 | ----------------------------- |
5872 | -- Subprogram_Name_Greater -- | |
5873 | ----------------------------- | |
5874 | ||
996ae0b0 RK |
5875 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
5876 | L1, L2 : Positive; | |
5877 | N1, N2 : Natural; | |
5878 | ||
5879 | begin | |
5880 | -- Remove trailing numeric parts | |
5881 | ||
5882 | L1 := S1'Last; | |
5883 | while S1 (L1) in '0' .. '9' loop | |
5884 | L1 := L1 - 1; | |
5885 | end loop; | |
5886 | ||
5887 | L2 := S2'Last; | |
5888 | while S2 (L2) in '0' .. '9' loop | |
5889 | L2 := L2 - 1; | |
5890 | end loop; | |
5891 | ||
5892 | -- If non-numeric parts non-equal, that's decisive | |
5893 | ||
5894 | if S1 (S1'First .. L1) < S2 (S2'First .. L2) then | |
5895 | return False; | |
5896 | ||
5897 | elsif S1 (S1'First .. L1) > S2 (S2'First .. L2) then | |
5898 | return True; | |
5899 | ||
5900 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
5901 | -- that a missing suffix is treated as numeric zero in this test. | |
5902 | ||
5903 | else | |
5904 | N1 := 0; | |
5905 | while L1 < S1'Last loop | |
5906 | L1 := L1 + 1; | |
5907 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
5908 | end loop; | |
5909 | ||
5910 | N2 := 0; | |
5911 | while L2 < S2'Last loop | |
5912 | L2 := L2 + 1; | |
5913 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
5914 | end loop; | |
5915 | ||
5916 | return N1 > N2; | |
5917 | end if; | |
5918 | end Subprogram_Name_Greater; | |
5919 | ||
5920 | -- Start of processing for Check_Subprogram_Order | |
5921 | ||
5922 | begin | |
5923 | -- Check body in alpha order if this is option | |
5924 | ||
fbf5a39b | 5925 | if Style_Check |
bc202b70 | 5926 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
5927 | and then Nkind (N) = N_Subprogram_Body |
5928 | and then Comes_From_Source (N) | |
5929 | and then In_Extended_Main_Source_Unit (N) | |
5930 | then | |
5931 | declare | |
5932 | LSN : String_Ptr | |
5933 | renames Scope_Stack.Table | |
5934 | (Scope_Stack.Last).Last_Subprogram_Name; | |
5935 | ||
5936 | Body_Id : constant Entity_Id := | |
5937 | Defining_Entity (Specification (N)); | |
5938 | ||
5939 | begin | |
5940 | Get_Decoded_Name_String (Chars (Body_Id)); | |
5941 | ||
5942 | if LSN /= null then | |
5943 | if Subprogram_Name_Greater | |
5944 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
5945 | then | |
5946 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
5947 | end if; | |
5948 | ||
5949 | Free (LSN); | |
5950 | end if; | |
5951 | ||
5952 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
5953 | end; | |
5954 | end if; | |
5955 | end Check_Subprogram_Order; | |
5956 | ||
5957 | ------------------------------ | |
5958 | -- Check_Subtype_Conformant -- | |
5959 | ------------------------------ | |
5960 | ||
5961 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
5962 | (New_Id : Entity_Id; |
5963 | Old_Id : Entity_Id; | |
5964 | Err_Loc : Node_Id := Empty; | |
5965 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 RK |
5966 | is |
5967 | Result : Boolean; | |
81db9d77 | 5968 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5969 | begin |
5970 | Check_Conformance | |
ce2b6ba5 JM |
5971 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
5972 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
5973 | end Check_Subtype_Conformant; |
5974 | ||
5975 | --------------------------- | |
5976 | -- Check_Type_Conformant -- | |
5977 | --------------------------- | |
5978 | ||
5979 | procedure Check_Type_Conformant | |
5980 | (New_Id : Entity_Id; | |
5981 | Old_Id : Entity_Id; | |
5982 | Err_Loc : Node_Id := Empty) | |
5983 | is | |
5984 | Result : Boolean; | |
81db9d77 | 5985 | pragma Warnings (Off, Result); |
996ae0b0 RK |
5986 | begin |
5987 | Check_Conformance | |
5988 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
5989 | end Check_Type_Conformant; | |
5990 | ||
806f6d37 AC |
5991 | --------------------------- |
5992 | -- Can_Override_Operator -- | |
5993 | --------------------------- | |
5994 | ||
5995 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
5996 | Typ : Entity_Id; | |
5997 | begin | |
5998 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
5999 | return False; | |
6000 | ||
6001 | else | |
6002 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
6003 | ||
6004 | return Operator_Matches_Spec (Subp, Subp) | |
6005 | and then Scope (Subp) = Scope (Typ) | |
6006 | and then not Is_Class_Wide_Type (Typ); | |
6007 | end if; | |
6008 | end Can_Override_Operator; | |
6009 | ||
996ae0b0 RK |
6010 | ---------------------- |
6011 | -- Conforming_Types -- | |
6012 | ---------------------- | |
6013 | ||
6014 | function Conforming_Types | |
6015 | (T1 : Entity_Id; | |
6016 | T2 : Entity_Id; | |
6017 | Ctype : Conformance_Type; | |
d05ef0ab | 6018 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
6019 | is |
6020 | Type_1 : Entity_Id := T1; | |
6021 | Type_2 : Entity_Id := T2; | |
af4b9434 | 6022 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
6023 | |
6024 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
6025 | -- If neither T1 nor T2 are generic actual types, or if they are in |
6026 | -- different scopes (e.g. parent and child instances), then verify that | |
6027 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
6028 | -- subtype chain. The whole purpose of this procedure is to prevent | |
6029 | -- spurious ambiguities in an instantiation that may arise if two | |
6030 | -- distinct generic types are instantiated with the same actual. | |
6031 | ||
5d37ba92 ES |
6032 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
6033 | -- An access parameter can designate an incomplete type. If the | |
6034 | -- incomplete type is the limited view of a type from a limited_ | |
6035 | -- with_clause, check whether the non-limited view is available. If | |
6036 | -- it is a (non-limited) incomplete type, get the full view. | |
6037 | ||
0a36105d JM |
6038 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
6039 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
6040 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
6041 | -- with view of a type is used in a subprogram declaration and the | |
6042 | -- subprogram body is in the scope of a regular with clause for the | |
6043 | -- same unit. In such a case, the two type entities can be considered | |
6044 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
6045 | |
6046 | ---------------------- | |
6047 | -- Base_Types_Match -- | |
6048 | ---------------------- | |
6049 | ||
6050 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
6051 | begin | |
6052 | if T1 = T2 then | |
6053 | return True; | |
6054 | ||
6055 | elsif Base_Type (T1) = Base_Type (T2) then | |
6056 | ||
0a36105d | 6057 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
6058 | -- check that the generic actual is an ancestor subtype of the |
6059 | -- other ???. | |
6060 | ||
6061 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
6062 | or else not Is_Generic_Actual_Type (T2) |
6063 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 6064 | |
0a36105d JM |
6065 | else |
6066 | return False; | |
6067 | end if; | |
6068 | end Base_Types_Match; | |
aa720a54 | 6069 | |
5d37ba92 ES |
6070 | -------------------------- |
6071 | -- Find_Designated_Type -- | |
6072 | -------------------------- | |
6073 | ||
6074 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
6075 | Desig : Entity_Id; | |
6076 | ||
6077 | begin | |
6078 | Desig := Directly_Designated_Type (T); | |
6079 | ||
6080 | if Ekind (Desig) = E_Incomplete_Type then | |
6081 | ||
6082 | -- If regular incomplete type, get full view if available | |
6083 | ||
6084 | if Present (Full_View (Desig)) then | |
6085 | Desig := Full_View (Desig); | |
6086 | ||
6087 | -- If limited view of a type, get non-limited view if available, | |
6088 | -- and check again for a regular incomplete type. | |
6089 | ||
6090 | elsif Present (Non_Limited_View (Desig)) then | |
6091 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
6092 | end if; | |
6093 | end if; | |
6094 | ||
6095 | return Desig; | |
6096 | end Find_Designated_Type; | |
6097 | ||
0a36105d JM |
6098 | ------------------------------- |
6099 | -- Matches_Limited_With_View -- | |
6100 | ------------------------------- | |
6101 | ||
6102 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
6103 | begin | |
6104 | -- In some cases a type imported through a limited_with clause, and | |
6105 | -- its nonlimited view are both visible, for example in an anonymous | |
6106 | -- access-to-class-wide type in a formal. Both entities designate the | |
6107 | -- same type. | |
6108 | ||
6109 | if From_With_Type (T1) | |
6110 | and then T2 = Available_View (T1) | |
aa720a54 AC |
6111 | then |
6112 | return True; | |
6113 | ||
41251c60 | 6114 | elsif From_With_Type (T2) |
0a36105d | 6115 | and then T1 = Available_View (T2) |
41251c60 JM |
6116 | then |
6117 | return True; | |
3e24afaa AC |
6118 | |
6119 | elsif From_With_Type (T1) | |
6120 | and then From_With_Type (T2) | |
6121 | and then Available_View (T1) = Available_View (T2) | |
6122 | then | |
6123 | return True; | |
41251c60 | 6124 | |
996ae0b0 RK |
6125 | else |
6126 | return False; | |
6127 | end if; | |
0a36105d | 6128 | end Matches_Limited_With_View; |
996ae0b0 | 6129 | |
ec4867fa | 6130 | -- Start of processing for Conforming_Types |
758c442c | 6131 | |
996ae0b0 RK |
6132 | begin |
6133 | -- The context is an instance association for a formal | |
82c80734 RD |
6134 | -- access-to-subprogram type; the formal parameter types require |
6135 | -- mapping because they may denote other formal parameters of the | |
6136 | -- generic unit. | |
996ae0b0 RK |
6137 | |
6138 | if Get_Inst then | |
6139 | Type_1 := Get_Instance_Of (T1); | |
6140 | Type_2 := Get_Instance_Of (T2); | |
6141 | end if; | |
6142 | ||
0a36105d JM |
6143 | -- If one of the types is a view of the other introduced by a limited |
6144 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 6145 | |
0a36105d JM |
6146 | if Matches_Limited_With_View (T1, T2) then |
6147 | return True; | |
6148 | ||
6149 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
6150 | return Ctype <= Mode_Conformant |
6151 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
6152 | ||
6153 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
6154 | and then Present (Full_View (Type_1)) | |
6155 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
6156 | then | |
6157 | return Ctype <= Mode_Conformant | |
6158 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
6159 | ||
6160 | elsif Ekind (Type_2) = E_Incomplete_Type | |
6161 | and then Present (Full_View (Type_2)) | |
6162 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6163 | then | |
6164 | return Ctype <= Mode_Conformant | |
6165 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
6166 | |
6167 | elsif Is_Private_Type (Type_2) | |
6168 | and then In_Instance | |
6169 | and then Present (Full_View (Type_2)) | |
6170 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
6171 | then | |
6172 | return Ctype <= Mode_Conformant | |
6173 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
996ae0b0 RK |
6174 | end if; |
6175 | ||
0a36105d | 6176 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
758c442c | 6177 | -- treated recursively because they carry a signature. |
af4b9434 AC |
6178 | |
6179 | Are_Anonymous_Access_To_Subprogram_Types := | |
f937473f RD |
6180 | Ekind (Type_1) = Ekind (Type_2) |
6181 | and then | |
800621e0 | 6182 | (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type |
f937473f RD |
6183 | or else |
6184 | Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 6185 | |
996ae0b0 | 6186 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
6187 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
6188 | -- the base types because we may have built internal subtype entities | |
6189 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 6190 | |
5d37ba92 ES |
6191 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
6192 | and then | |
6193 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
0ab80019 | 6194 | or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254) |
996ae0b0 RK |
6195 | then |
6196 | declare | |
6197 | Desig_1 : Entity_Id; | |
6198 | Desig_2 : Entity_Id; | |
6199 | ||
6200 | begin | |
885c4871 | 6201 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 6202 | -- subtype conformance. |
9dcb52e1 | 6203 | |
0791fbe9 | 6204 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
6205 | and then Ctype >= Subtype_Conformant |
6206 | and then | |
6207 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
6208 | then | |
6209 | return False; | |
996ae0b0 RK |
6210 | end if; |
6211 | ||
5d37ba92 | 6212 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 6213 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 6214 | |
5d37ba92 | 6215 | -- If the context is an instance association for a formal |
82c80734 RD |
6216 | -- access-to-subprogram type; formal access parameter designated |
6217 | -- types require mapping because they may denote other formal | |
6218 | -- parameters of the generic unit. | |
996ae0b0 RK |
6219 | |
6220 | if Get_Inst then | |
6221 | Desig_1 := Get_Instance_Of (Desig_1); | |
6222 | Desig_2 := Get_Instance_Of (Desig_2); | |
6223 | end if; | |
6224 | ||
82c80734 RD |
6225 | -- It is possible for a Class_Wide_Type to be introduced for an |
6226 | -- incomplete type, in which case there is a separate class_ wide | |
6227 | -- type for the full view. The types conform if their Etypes | |
6228 | -- conform, i.e. one may be the full view of the other. This can | |
6229 | -- only happen in the context of an access parameter, other uses | |
6230 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 6231 | |
fbf5a39b | 6232 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
6233 | and then |
6234 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
6235 | then |
6236 | return | |
fbf5a39b AC |
6237 | Conforming_Types |
6238 | (Etype (Base_Type (Desig_1)), | |
6239 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
6240 | |
6241 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 6242 | if Ada_Version < Ada_2005 then |
758c442c GD |
6243 | return Ctype = Type_Conformant |
6244 | or else | |
af4b9434 AC |
6245 | Subtypes_Statically_Match (Desig_1, Desig_2); |
6246 | ||
758c442c GD |
6247 | -- We must check the conformance of the signatures themselves |
6248 | ||
6249 | else | |
6250 | declare | |
6251 | Conformant : Boolean; | |
6252 | begin | |
6253 | Check_Conformance | |
6254 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
6255 | return Conformant; | |
6256 | end; | |
6257 | end if; | |
6258 | ||
996ae0b0 RK |
6259 | else |
6260 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
6261 | and then (Ctype = Type_Conformant | |
af4b9434 AC |
6262 | or else |
6263 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
6264 | end if; |
6265 | end; | |
6266 | ||
6267 | -- Otherwise definitely no match | |
6268 | ||
6269 | else | |
c8ef728f ES |
6270 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
6271 | and then Is_Access_Type (Type_2)) | |
6272 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
6273 | and then Is_Access_Type (Type_1))) | |
6274 | and then | |
6275 | Conforming_Types | |
6276 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
6277 | then | |
6278 | May_Hide_Profile := True; | |
6279 | end if; | |
6280 | ||
996ae0b0 RK |
6281 | return False; |
6282 | end if; | |
996ae0b0 RK |
6283 | end Conforming_Types; |
6284 | ||
6285 | -------------------------- | |
6286 | -- Create_Extra_Formals -- | |
6287 | -------------------------- | |
6288 | ||
6289 | procedure Create_Extra_Formals (E : Entity_Id) is | |
6290 | Formal : Entity_Id; | |
ec4867fa | 6291 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
6292 | Last_Extra : Entity_Id; |
6293 | Formal_Type : Entity_Id; | |
6294 | P_Formal : Entity_Id := Empty; | |
6295 | ||
ec4867fa ES |
6296 | function Add_Extra_Formal |
6297 | (Assoc_Entity : Entity_Id; | |
6298 | Typ : Entity_Id; | |
6299 | Scope : Entity_Id; | |
6300 | Suffix : String) return Entity_Id; | |
6301 | -- Add an extra formal to the current list of formals and extra formals. | |
6302 | -- The extra formal is added to the end of the list of extra formals, | |
6303 | -- and also returned as the result. These formals are always of mode IN. | |
6304 | -- The new formal has the type Typ, is declared in Scope, and its name | |
6305 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
6306 | -- The following suffixes are currently used. They should not be changed |
6307 | -- without coordinating with CodePeer, which makes use of these to | |
6308 | -- provide better messages. | |
6309 | ||
d92eccc3 AC |
6310 | -- O denotes the Constrained bit. |
6311 | -- L denotes the accessibility level. | |
cd5a9750 AC |
6312 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
6313 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 6314 | |
fbf5a39b AC |
6315 | ---------------------- |
6316 | -- Add_Extra_Formal -- | |
6317 | ---------------------- | |
6318 | ||
ec4867fa ES |
6319 | function Add_Extra_Formal |
6320 | (Assoc_Entity : Entity_Id; | |
6321 | Typ : Entity_Id; | |
6322 | Scope : Entity_Id; | |
6323 | Suffix : String) return Entity_Id | |
6324 | is | |
996ae0b0 | 6325 | EF : constant Entity_Id := |
ec4867fa ES |
6326 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
6327 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 6328 | Suffix => Suffix)); |
996ae0b0 RK |
6329 | |
6330 | begin | |
82c80734 RD |
6331 | -- A little optimization. Never generate an extra formal for the |
6332 | -- _init operand of an initialization procedure, since it could | |
6333 | -- never be used. | |
996ae0b0 RK |
6334 | |
6335 | if Chars (Formal) = Name_uInit then | |
6336 | return Empty; | |
6337 | end if; | |
6338 | ||
6339 | Set_Ekind (EF, E_In_Parameter); | |
6340 | Set_Actual_Subtype (EF, Typ); | |
6341 | Set_Etype (EF, Typ); | |
ec4867fa | 6342 | Set_Scope (EF, Scope); |
996ae0b0 RK |
6343 | Set_Mechanism (EF, Default_Mechanism); |
6344 | Set_Formal_Validity (EF); | |
6345 | ||
ec4867fa ES |
6346 | if No (First_Extra) then |
6347 | First_Extra := EF; | |
6348 | Set_Extra_Formals (Scope, First_Extra); | |
6349 | end if; | |
6350 | ||
6351 | if Present (Last_Extra) then | |
6352 | Set_Extra_Formal (Last_Extra, EF); | |
6353 | end if; | |
6354 | ||
996ae0b0 | 6355 | Last_Extra := EF; |
ec4867fa | 6356 | |
996ae0b0 RK |
6357 | return EF; |
6358 | end Add_Extra_Formal; | |
6359 | ||
6360 | -- Start of processing for Create_Extra_Formals | |
6361 | ||
6362 | begin | |
f937473f RD |
6363 | -- We never generate extra formals if expansion is not active |
6364 | -- because we don't need them unless we are generating code. | |
6365 | ||
6366 | if not Expander_Active then | |
6367 | return; | |
6368 | end if; | |
6369 | ||
82c80734 | 6370 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 6371 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 6372 | -- for extra formals. |
996ae0b0 RK |
6373 | |
6374 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
6375 | P_Formal := First_Formal (Alias (E)); | |
6376 | end if; | |
6377 | ||
6378 | Last_Extra := Empty; | |
6379 | Formal := First_Formal (E); | |
6380 | while Present (Formal) loop | |
6381 | Last_Extra := Formal; | |
6382 | Next_Formal (Formal); | |
6383 | end loop; | |
6384 | ||
f937473f | 6385 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
6386 | -- situation may arise for subprogram types created as part of |
6387 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 RK |
6388 | |
6389 | if Present (Last_Extra) and then | |
6390 | Present (Extra_Formal (Last_Extra)) | |
6391 | then | |
6392 | return; | |
6393 | end if; | |
6394 | ||
19590d70 GD |
6395 | -- If the subprogram is a predefined dispatching subprogram then don't |
6396 | -- generate any extra constrained or accessibility level formals. In | |
6397 | -- general we suppress these for internal subprograms (by not calling | |
6398 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
6399 | -- generated stream attributes do get passed through because extra | |
6400 | -- build-in-place formals are needed in some cases (limited 'Input). | |
6401 | ||
bac7206d | 6402 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 6403 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
6404 | end if; |
6405 | ||
996ae0b0 | 6406 | Formal := First_Formal (E); |
996ae0b0 RK |
6407 | while Present (Formal) loop |
6408 | ||
6409 | -- Create extra formal for supporting the attribute 'Constrained. | |
6410 | -- The case of a private type view without discriminants also | |
6411 | -- requires the extra formal if the underlying type has defaulted | |
6412 | -- discriminants. | |
6413 | ||
6414 | if Ekind (Formal) /= E_In_Parameter then | |
6415 | if Present (P_Formal) then | |
6416 | Formal_Type := Etype (P_Formal); | |
6417 | else | |
6418 | Formal_Type := Etype (Formal); | |
6419 | end if; | |
6420 | ||
5d09245e AC |
6421 | -- Do not produce extra formals for Unchecked_Union parameters. |
6422 | -- Jump directly to the end of the loop. | |
6423 | ||
6424 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
6425 | goto Skip_Extra_Formal_Generation; | |
6426 | end if; | |
6427 | ||
996ae0b0 RK |
6428 | if not Has_Discriminants (Formal_Type) |
6429 | and then Ekind (Formal_Type) in Private_Kind | |
6430 | and then Present (Underlying_Type (Formal_Type)) | |
6431 | then | |
6432 | Formal_Type := Underlying_Type (Formal_Type); | |
6433 | end if; | |
6434 | ||
5e5db3b4 GD |
6435 | -- Suppress the extra formal if formal's subtype is constrained or |
6436 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
6437 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
6438 | -- can have defaulted discriminants, but 'Constrained is required | |
6439 | -- to return True, so the formal is never needed (see AI05-0214). | |
6440 | -- Note that this ensures consistency of calling sequences for | |
6441 | -- dispatching operations when some types in a class have defaults | |
6442 | -- on discriminants and others do not (and requiring the extra | |
6443 | -- formal would introduce distributed overhead). | |
6444 | ||
996ae0b0 | 6445 | if Has_Discriminants (Formal_Type) |
f937473f RD |
6446 | and then not Is_Constrained (Formal_Type) |
6447 | and then not Is_Indefinite_Subtype (Formal_Type) | |
5e5db3b4 GD |
6448 | and then (Ada_Version < Ada_2012 |
6449 | or else | |
6450 | not (Is_Tagged_Type (Underlying_Type (Formal_Type)) | |
6451 | and then Is_Limited_Type (Formal_Type))) | |
996ae0b0 RK |
6452 | then |
6453 | Set_Extra_Constrained | |
d92eccc3 | 6454 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
6455 | end if; |
6456 | end if; | |
6457 | ||
0a36105d JM |
6458 | -- Create extra formal for supporting accessibility checking. This |
6459 | -- is done for both anonymous access formals and formals of named | |
6460 | -- access types that are marked as controlling formals. The latter | |
6461 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
6462 | -- type and substitutes the types of access-to-class-wide actuals | |
6463 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
6464 | -- Base_Type is applied because in cases where there is a null |
6465 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
6466 | |
6467 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 6468 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
6469 | -- package in which it resides. However, we do not suppress it |
6470 | -- simply if the scope has accessibility checks suppressed, since | |
6471 | -- this could cause trouble when clients are compiled with a | |
6472 | -- different suppression setting. The explicit checks at the | |
6473 | -- package level are safe from this point of view. | |
996ae0b0 | 6474 | |
5d37ba92 | 6475 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 6476 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 6477 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 6478 | and then not |
fbf5a39b | 6479 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 6480 | or else |
fbf5a39b | 6481 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 6482 | and then |
c8ef728f | 6483 | (No (P_Formal) |
996ae0b0 RK |
6484 | or else Present (Extra_Accessibility (P_Formal))) |
6485 | then | |
811c6a85 | 6486 | Set_Extra_Accessibility |
d92eccc3 | 6487 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
6488 | end if; |
6489 | ||
5d09245e AC |
6490 | -- This label is required when skipping extra formal generation for |
6491 | -- Unchecked_Union parameters. | |
6492 | ||
6493 | <<Skip_Extra_Formal_Generation>> | |
6494 | ||
f937473f RD |
6495 | if Present (P_Formal) then |
6496 | Next_Formal (P_Formal); | |
6497 | end if; | |
6498 | ||
996ae0b0 RK |
6499 | Next_Formal (Formal); |
6500 | end loop; | |
ec4867fa | 6501 | |
63585f75 SB |
6502 | <<Test_For_Func_Result_Extras>> |
6503 | ||
6504 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
6505 | -- function call is ... determined by the point of call ...". | |
6506 | ||
6507 | if Needs_Result_Accessibility_Level (E) then | |
6508 | Set_Extra_Accessibility_Of_Result | |
6509 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
6510 | end if; | |
19590d70 | 6511 | |
ec4867fa | 6512 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
6513 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
6514 | ||
0791fbe9 | 6515 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 6516 | declare |
f937473f | 6517 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 6518 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 6519 | Formal_Typ : Entity_Id; |
f937473f | 6520 | |
2fcc44fa | 6521 | Discard : Entity_Id; |
f937473f | 6522 | pragma Warnings (Off, Discard); |
ec4867fa ES |
6523 | |
6524 | begin | |
f937473f | 6525 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
6526 | -- add a 4-state formal indicating whether the return object is |
6527 | -- allocated by the caller (1), or should be allocated by the | |
6528 | -- callee on the secondary stack (2), in the global heap (3), or | |
6529 | -- in a user-defined storage pool (4). For the moment we just use | |
6530 | -- Natural for the type of this formal. Note that this formal | |
6531 | -- isn't usually needed in the case where the result subtype is | |
6532 | -- constrained, but it is needed when the function has a tagged | |
6533 | -- result, because generally such functions can be called in a | |
6534 | -- dispatching context and such calls must be handled like calls | |
6535 | -- to a class-wide function. | |
0a36105d | 6536 | |
1bb6e262 | 6537 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
6538 | Discard := |
6539 | Add_Extra_Formal | |
6540 | (E, Standard_Natural, | |
6541 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 6542 | |
8417f4b2 | 6543 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 AC |
6544 | -- use a user-defined pool. This formal is not added on |
6545 | -- .NET/JVM/ZFP as those targets do not support pools. | |
200b7162 | 6546 | |
ea10ca9c AC |
6547 | if VM_Target = No_VM |
6548 | and then RTE_Available (RE_Root_Storage_Pool_Ptr) | |
3e452820 | 6549 | then |
8417f4b2 AC |
6550 | Discard := |
6551 | Add_Extra_Formal | |
6552 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
6553 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
6554 | end if; | |
f937473f | 6555 | end if; |
ec4867fa | 6556 | |
df3e68b1 | 6557 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 6558 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 6559 | |
ca5af305 | 6560 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
6561 | Discard := |
6562 | Add_Extra_Formal | |
ca5af305 AC |
6563 | (E, RTE (RE_Finalization_Master_Ptr), |
6564 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
6565 | end if; |
6566 | ||
94bbf008 AC |
6567 | -- When the result type contains tasks, add two extra formals: the |
6568 | -- master of the tasks to be created, and the caller's activation | |
6569 | -- chain. | |
f937473f | 6570 | |
1a36a0cd | 6571 | if Has_Task (Full_Subt) then |
f937473f RD |
6572 | Discard := |
6573 | Add_Extra_Formal | |
6574 | (E, RTE (RE_Master_Id), | |
af89615f | 6575 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
6576 | Discard := |
6577 | Add_Extra_Formal | |
6578 | (E, RTE (RE_Activation_Chain_Access), | |
6579 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
6580 | end if; | |
ec4867fa | 6581 | |
f937473f RD |
6582 | -- All build-in-place functions get an extra formal that will be |
6583 | -- passed the address of the return object within the caller. | |
ec4867fa | 6584 | |
1a36a0cd AC |
6585 | Formal_Typ := |
6586 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 6587 | |
1a36a0cd AC |
6588 | Set_Directly_Designated_Type (Formal_Typ, Result_Subt); |
6589 | Set_Etype (Formal_Typ, Formal_Typ); | |
6590 | Set_Depends_On_Private | |
6591 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
6592 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
6593 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 6594 | |
1a36a0cd AC |
6595 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
6596 | -- the designated type comes from the limited view (for back-end | |
6597 | -- purposes). | |
ec4867fa | 6598 | |
1a36a0cd | 6599 | Set_From_With_Type (Formal_Typ, From_With_Type (Result_Subt)); |
f937473f | 6600 | |
1a36a0cd AC |
6601 | Layout_Type (Formal_Typ); |
6602 | ||
6603 | Discard := | |
6604 | Add_Extra_Formal | |
6605 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
6606 | end; |
6607 | end if; | |
996ae0b0 RK |
6608 | end Create_Extra_Formals; |
6609 | ||
6610 | ----------------------------- | |
6611 | -- Enter_Overloaded_Entity -- | |
6612 | ----------------------------- | |
6613 | ||
6614 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
6615 | E : Entity_Id := Current_Entity_In_Scope (S); | |
6616 | C_E : Entity_Id := Current_Entity (S); | |
6617 | ||
6618 | begin | |
6619 | if Present (E) then | |
6620 | Set_Has_Homonym (E); | |
6621 | Set_Has_Homonym (S); | |
6622 | end if; | |
6623 | ||
6624 | Set_Is_Immediately_Visible (S); | |
6625 | Set_Scope (S, Current_Scope); | |
6626 | ||
6627 | -- Chain new entity if front of homonym in current scope, so that | |
6628 | -- homonyms are contiguous. | |
6629 | ||
6630 | if Present (E) | |
6631 | and then E /= C_E | |
6632 | then | |
6633 | while Homonym (C_E) /= E loop | |
6634 | C_E := Homonym (C_E); | |
6635 | end loop; | |
6636 | ||
6637 | Set_Homonym (C_E, S); | |
6638 | ||
6639 | else | |
6640 | E := C_E; | |
6641 | Set_Current_Entity (S); | |
6642 | end if; | |
6643 | ||
6644 | Set_Homonym (S, E); | |
6645 | ||
6646 | Append_Entity (S, Current_Scope); | |
6647 | Set_Public_Status (S); | |
6648 | ||
6649 | if Debug_Flag_E then | |
6650 | Write_Str ("New overloaded entity chain: "); | |
6651 | Write_Name (Chars (S)); | |
996ae0b0 | 6652 | |
82c80734 | 6653 | E := S; |
996ae0b0 RK |
6654 | while Present (E) loop |
6655 | Write_Str (" "); Write_Int (Int (E)); | |
6656 | E := Homonym (E); | |
6657 | end loop; | |
6658 | ||
6659 | Write_Eol; | |
6660 | end if; | |
6661 | ||
6662 | -- Generate warning for hiding | |
6663 | ||
6664 | if Warn_On_Hiding | |
6665 | and then Comes_From_Source (S) | |
6666 | and then In_Extended_Main_Source_Unit (S) | |
6667 | then | |
6668 | E := S; | |
6669 | loop | |
6670 | E := Homonym (E); | |
6671 | exit when No (E); | |
6672 | ||
7fc53871 AC |
6673 | -- Warn unless genuine overloading. Do not emit warning on |
6674 | -- hiding predefined operators in Standard (these are either an | |
6675 | -- (artifact of our implicit declarations, or simple noise) but | |
6676 | -- keep warning on a operator defined on a local subtype, because | |
6677 | -- of the real danger that different operators may be applied in | |
6678 | -- various parts of the program. | |
996ae0b0 | 6679 | |
1f250383 AC |
6680 | -- Note that if E and S have the same scope, there is never any |
6681 | -- hiding. Either the two conflict, and the program is illegal, | |
6682 | -- or S is overriding an implicit inherited subprogram. | |
6683 | ||
6684 | if Scope (E) /= Scope (S) | |
6685 | and then (not Is_Overloadable (E) | |
8d606a78 | 6686 | or else Subtype_Conformant (E, S)) |
f937473f RD |
6687 | and then (Is_Immediately_Visible (E) |
6688 | or else | |
6689 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 6690 | then |
7fc53871 AC |
6691 | if Scope (E) /= Standard_Standard then |
6692 | Error_Msg_Sloc := Sloc (E); | |
6693 | Error_Msg_N ("declaration of & hides one#?", S); | |
6694 | ||
6695 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
6696 | and then | |
1f250383 | 6697 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
6698 | then |
6699 | Error_Msg_N | |
6700 | ("declaration of & hides predefined operator?", S); | |
6701 | end if; | |
996ae0b0 RK |
6702 | end if; |
6703 | end loop; | |
6704 | end if; | |
6705 | end Enter_Overloaded_Entity; | |
6706 | ||
e5a58fac AC |
6707 | ----------------------------- |
6708 | -- Check_Untagged_Equality -- | |
6709 | ----------------------------- | |
6710 | ||
6711 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
6712 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
6713 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
6714 | Obj_Decl : Node_Id; | |
6715 | ||
6716 | begin | |
6717 | if Nkind (Decl) = N_Subprogram_Declaration | |
6718 | and then Is_Record_Type (Typ) | |
6719 | and then not Is_Tagged_Type (Typ) | |
6720 | then | |
21a5b575 AC |
6721 | -- If the type is not declared in a package, or if we are in the |
6722 | -- body of the package or in some other scope, the new operation is | |
6723 | -- not primitive, and therefore legal, though suspicious. If the | |
6724 | -- type is a generic actual (sub)type, the operation is not primitive | |
6725 | -- either because the base type is declared elsewhere. | |
6726 | ||
e5a58fac | 6727 | if Is_Frozen (Typ) then |
21a5b575 AC |
6728 | if Ekind (Scope (Typ)) /= E_Package |
6729 | or else Scope (Typ) /= Current_Scope | |
6730 | then | |
6731 | null; | |
e5a58fac | 6732 | |
21a5b575 AC |
6733 | elsif Is_Generic_Actual_Type (Typ) then |
6734 | null; | |
e5a58fac | 6735 | |
21a5b575 | 6736 | elsif In_Package_Body (Scope (Typ)) then |
ae6ede77 AC |
6737 | Error_Msg_NE |
6738 | ("equality operator must be declared " | |
6739 | & "before type& is frozen", Eq_Op, Typ); | |
6740 | Error_Msg_N | |
6741 | ("\move declaration to package spec", Eq_Op); | |
21a5b575 AC |
6742 | |
6743 | else | |
6744 | Error_Msg_NE | |
6745 | ("equality operator must be declared " | |
6746 | & "before type& is frozen", Eq_Op, Typ); | |
6747 | ||
6748 | Obj_Decl := Next (Parent (Typ)); | |
6749 | while Present (Obj_Decl) | |
6750 | and then Obj_Decl /= Decl | |
6751 | loop | |
6752 | if Nkind (Obj_Decl) = N_Object_Declaration | |
6753 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
6754 | then | |
6755 | Error_Msg_NE ("type& is frozen by declaration?", | |
6756 | Obj_Decl, Typ); | |
6757 | Error_Msg_N | |
6758 | ("\an equality operator cannot be declared after this " | |
a4640a39 | 6759 | & "point (RM 4.5.2 (9.8)) (Ada 2012))?", Obj_Decl); |
21a5b575 AC |
6760 | exit; |
6761 | end if; | |
6762 | ||
6763 | Next (Obj_Decl); | |
6764 | end loop; | |
6765 | end if; | |
e5a58fac AC |
6766 | |
6767 | elsif not In_Same_List (Parent (Typ), Decl) | |
6768 | and then not Is_Limited_Type (Typ) | |
6769 | then | |
21a5b575 AC |
6770 | |
6771 | -- This makes it illegal to have a primitive equality declared in | |
6772 | -- the private part if the type is visible. | |
6773 | ||
e5a58fac AC |
6774 | Error_Msg_N ("equality operator appears too late", Eq_Op); |
6775 | end if; | |
6776 | end if; | |
6777 | end Check_Untagged_Equality; | |
6778 | ||
996ae0b0 RK |
6779 | ----------------------------- |
6780 | -- Find_Corresponding_Spec -- | |
6781 | ----------------------------- | |
6782 | ||
d44202ba HK |
6783 | function Find_Corresponding_Spec |
6784 | (N : Node_Id; | |
6785 | Post_Error : Boolean := True) return Entity_Id | |
6786 | is | |
996ae0b0 RK |
6787 | Spec : constant Node_Id := Specification (N); |
6788 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
6789 | ||
6790 | E : Entity_Id; | |
6791 | ||
6792 | begin | |
6793 | E := Current_Entity (Designator); | |
996ae0b0 RK |
6794 | while Present (E) loop |
6795 | ||
6796 | -- We are looking for a matching spec. It must have the same scope, | |
6797 | -- and the same name, and either be type conformant, or be the case | |
6798 | -- of a library procedure spec and its body (which belong to one | |
6799 | -- another regardless of whether they are type conformant or not). | |
6800 | ||
6801 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
6802 | if Current_Scope = Standard_Standard |
6803 | or else (Ekind (E) = Ekind (Designator) | |
6804 | and then Type_Conformant (E, Designator)) | |
996ae0b0 RK |
6805 | then |
6806 | -- Within an instantiation, we know that spec and body are | |
6807 | -- subtype conformant, because they were subtype conformant | |
6808 | -- in the generic. We choose the subtype-conformant entity | |
6809 | -- here as well, to resolve spurious ambiguities in the | |
6810 | -- instance that were not present in the generic (i.e. when | |
6811 | -- two different types are given the same actual). If we are | |
6812 | -- looking for a spec to match a body, full conformance is | |
6813 | -- expected. | |
6814 | ||
6815 | if In_Instance then | |
6816 | Set_Convention (Designator, Convention (E)); | |
6817 | ||
0187b60e AC |
6818 | -- Skip past subprogram bodies and subprogram renamings that |
6819 | -- may appear to have a matching spec, but that aren't fully | |
6820 | -- conformant with it. That can occur in cases where an | |
6821 | -- actual type causes unrelated homographs in the instance. | |
6822 | ||
6823 | if Nkind_In (N, N_Subprogram_Body, | |
6824 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 6825 | and then Present (Homonym (E)) |
c7b9d548 | 6826 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
6827 | then |
6828 | goto Next_Entity; | |
6829 | ||
c7b9d548 | 6830 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 RK |
6831 | goto Next_Entity; |
6832 | end if; | |
6833 | end if; | |
6834 | ||
25ebc085 AC |
6835 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
6836 | -- null procedures locate the internally generated spec. We | |
6837 | -- enforce mode conformance since a tagged type may inherit | |
6838 | -- from interfaces several null primitives which differ only | |
6839 | -- in the mode of the formals. | |
6840 | ||
6841 | if not (Comes_From_Source (E)) | |
6842 | and then Is_Null_Procedure (E) | |
6843 | and then not Mode_Conformant (Designator, E) | |
6844 | then | |
6845 | null; | |
6846 | ||
6847 | elsif not Has_Completion (E) then | |
996ae0b0 RK |
6848 | if Nkind (N) /= N_Subprogram_Body_Stub then |
6849 | Set_Corresponding_Spec (N, E); | |
6850 | end if; | |
6851 | ||
6852 | Set_Has_Completion (E); | |
6853 | return E; | |
6854 | ||
6855 | elsif Nkind (Parent (N)) = N_Subunit then | |
6856 | ||
6857 | -- If this is the proper body of a subunit, the completion | |
6858 | -- flag is set when analyzing the stub. | |
6859 | ||
6860 | return E; | |
6861 | ||
81db9d77 ES |
6862 | -- If E is an internal function with a controlling result |
6863 | -- that was created for an operation inherited by a null | |
6864 | -- extension, it may be overridden by a body without a previous | |
6865 | -- spec (one more reason why these should be shunned). In that | |
1366997b AC |
6866 | -- case remove the generated body if present, because the |
6867 | -- current one is the explicit overriding. | |
81db9d77 ES |
6868 | |
6869 | elsif Ekind (E) = E_Function | |
0791fbe9 | 6870 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
6871 | and then not Comes_From_Source (E) |
6872 | and then Has_Controlling_Result (E) | |
6873 | and then Is_Null_Extension (Etype (E)) | |
6874 | and then Comes_From_Source (Spec) | |
6875 | then | |
6876 | Set_Has_Completion (E, False); | |
6877 | ||
1366997b AC |
6878 | if Expander_Active |
6879 | and then Nkind (Parent (E)) = N_Function_Specification | |
6880 | then | |
81db9d77 ES |
6881 | Remove |
6882 | (Unit_Declaration_Node | |
1366997b AC |
6883 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
6884 | ||
81db9d77 ES |
6885 | return E; |
6886 | ||
1366997b AC |
6887 | -- If expansion is disabled, or if the wrapper function has |
6888 | -- not been generated yet, this a late body overriding an | |
6889 | -- inherited operation, or it is an overriding by some other | |
6890 | -- declaration before the controlling result is frozen. In | |
6891 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
6892 | |
6893 | else | |
6894 | return Empty; | |
6895 | end if; | |
6896 | ||
d44202ba HK |
6897 | -- If the body already exists, then this is an error unless |
6898 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
6899 | -- derived subprogram. It is also legal for an instance to |
6900 | -- contain type conformant overloadable declarations (but the | |
6901 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
6902 | |
6903 | elsif No (Alias (E)) | |
6904 | and then not Is_Intrinsic_Subprogram (E) | |
6905 | and then not In_Instance | |
d44202ba | 6906 | and then Post_Error |
996ae0b0 RK |
6907 | then |
6908 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 6909 | |
07fc65c4 GB |
6910 | if Is_Imported (E) then |
6911 | Error_Msg_NE | |
6912 | ("body not allowed for imported subprogram & declared#", | |
6913 | N, E); | |
6914 | else | |
6915 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
6916 | end if; | |
996ae0b0 RK |
6917 | end if; |
6918 | ||
d44202ba HK |
6919 | -- Child units cannot be overloaded, so a conformance mismatch |
6920 | -- between body and a previous spec is an error. | |
6921 | ||
996ae0b0 RK |
6922 | elsif Is_Child_Unit (E) |
6923 | and then | |
6924 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
6925 | and then | |
5d37ba92 | 6926 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
6927 | N_Compilation_Unit |
6928 | and then Post_Error | |
996ae0b0 | 6929 | then |
996ae0b0 RK |
6930 | Error_Msg_N |
6931 | ("body of child unit does not match previous declaration", N); | |
6932 | end if; | |
6933 | end if; | |
6934 | ||
6935 | <<Next_Entity>> | |
6936 | E := Homonym (E); | |
6937 | end loop; | |
6938 | ||
6939 | -- On exit, we know that no previous declaration of subprogram exists | |
6940 | ||
6941 | return Empty; | |
6942 | end Find_Corresponding_Spec; | |
6943 | ||
6944 | ---------------------- | |
6945 | -- Fully_Conformant -- | |
6946 | ---------------------- | |
6947 | ||
6948 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
6949 | Result : Boolean; | |
996ae0b0 RK |
6950 | begin |
6951 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
6952 | return Result; | |
6953 | end Fully_Conformant; | |
6954 | ||
6955 | ---------------------------------- | |
6956 | -- Fully_Conformant_Expressions -- | |
6957 | ---------------------------------- | |
6958 | ||
6959 | function Fully_Conformant_Expressions | |
6960 | (Given_E1 : Node_Id; | |
d05ef0ab | 6961 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
6962 | is |
6963 | E1 : constant Node_Id := Original_Node (Given_E1); | |
6964 | E2 : constant Node_Id := Original_Node (Given_E2); | |
6965 | -- We always test conformance on original nodes, since it is possible | |
6966 | -- for analysis and/or expansion to make things look as though they | |
6967 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
6968 | ||
6969 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
6970 | renames Fully_Conformant_Expressions; | |
6971 | ||
6972 | function FCL (L1, L2 : List_Id) return Boolean; | |
6973 | -- Compare elements of two lists for conformance. Elements have to | |
6974 | -- be conformant, and actuals inserted as default parameters do not | |
6975 | -- match explicit actuals with the same value. | |
6976 | ||
6977 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 6978 | -- Compare an operator node with a function call |
996ae0b0 RK |
6979 | |
6980 | --------- | |
6981 | -- FCL -- | |
6982 | --------- | |
6983 | ||
6984 | function FCL (L1, L2 : List_Id) return Boolean is | |
6985 | N1, N2 : Node_Id; | |
6986 | ||
6987 | begin | |
6988 | if L1 = No_List then | |
6989 | N1 := Empty; | |
6990 | else | |
6991 | N1 := First (L1); | |
6992 | end if; | |
6993 | ||
6994 | if L2 = No_List then | |
6995 | N2 := Empty; | |
6996 | else | |
6997 | N2 := First (L2); | |
6998 | end if; | |
6999 | ||
7000 | -- Compare two lists, skipping rewrite insertions (we want to | |
7001 | -- compare the original trees, not the expanded versions!) | |
7002 | ||
7003 | loop | |
7004 | if Is_Rewrite_Insertion (N1) then | |
7005 | Next (N1); | |
7006 | elsif Is_Rewrite_Insertion (N2) then | |
7007 | Next (N2); | |
7008 | elsif No (N1) then | |
7009 | return No (N2); | |
7010 | elsif No (N2) then | |
7011 | return False; | |
7012 | elsif not FCE (N1, N2) then | |
7013 | return False; | |
7014 | else | |
7015 | Next (N1); | |
7016 | Next (N2); | |
7017 | end if; | |
7018 | end loop; | |
7019 | end FCL; | |
7020 | ||
7021 | --------- | |
7022 | -- FCO -- | |
7023 | --------- | |
7024 | ||
7025 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
7026 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
7027 | Act : Node_Id; | |
7028 | ||
7029 | begin | |
7030 | if No (Actuals) | |
7031 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
7032 | then | |
7033 | return False; | |
7034 | ||
7035 | else | |
7036 | Act := First (Actuals); | |
7037 | ||
7038 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
7039 | if not FCE (Left_Opnd (Op_Node), Act) then |
7040 | return False; | |
7041 | end if; | |
7042 | ||
7043 | Next (Act); | |
7044 | end if; | |
7045 | ||
7046 | return Present (Act) | |
7047 | and then FCE (Right_Opnd (Op_Node), Act) | |
7048 | and then No (Next (Act)); | |
7049 | end if; | |
7050 | end FCO; | |
7051 | ||
7052 | -- Start of processing for Fully_Conformant_Expressions | |
7053 | ||
7054 | begin | |
7055 | -- Non-conformant if paren count does not match. Note: if some idiot | |
7056 | -- complains that we don't do this right for more than 3 levels of | |
0a36105d | 7057 | -- parentheses, they will be treated with the respect they deserve! |
996ae0b0 RK |
7058 | |
7059 | if Paren_Count (E1) /= Paren_Count (E2) then | |
7060 | return False; | |
7061 | ||
82c80734 RD |
7062 | -- If same entities are referenced, then they are conformant even if |
7063 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
7064 | |
7065 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
7066 | if Present (Entity (E1)) then | |
7067 | return Entity (E1) = Entity (E2) | |
7068 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
7069 | and then Ekind (Entity (E1)) = E_Discriminant | |
7070 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
7071 | ||
7072 | elsif Nkind (E1) = N_Expanded_Name | |
7073 | and then Nkind (E2) = N_Expanded_Name | |
7074 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
7075 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
7076 | then | |
7077 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
7078 | ||
7079 | else | |
7080 | -- Identifiers in component associations don't always have | |
7081 | -- entities, but their names must conform. | |
7082 | ||
7083 | return Nkind (E1) = N_Identifier | |
7084 | and then Nkind (E2) = N_Identifier | |
7085 | and then Chars (E1) = Chars (E2); | |
7086 | end if; | |
7087 | ||
7088 | elsif Nkind (E1) = N_Character_Literal | |
7089 | and then Nkind (E2) = N_Expanded_Name | |
7090 | then | |
7091 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
7092 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
7093 | ||
7094 | elsif Nkind (E2) = N_Character_Literal | |
7095 | and then Nkind (E1) = N_Expanded_Name | |
7096 | then | |
7097 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
7098 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
7099 | ||
7100 | elsif Nkind (E1) in N_Op | |
7101 | and then Nkind (E2) = N_Function_Call | |
7102 | then | |
7103 | return FCO (E1, E2); | |
7104 | ||
7105 | elsif Nkind (E2) in N_Op | |
7106 | and then Nkind (E1) = N_Function_Call | |
7107 | then | |
7108 | return FCO (E2, E1); | |
7109 | ||
7110 | -- Otherwise we must have the same syntactic entity | |
7111 | ||
7112 | elsif Nkind (E1) /= Nkind (E2) then | |
7113 | return False; | |
7114 | ||
7115 | -- At this point, we specialize by node type | |
7116 | ||
7117 | else | |
7118 | case Nkind (E1) is | |
7119 | ||
7120 | when N_Aggregate => | |
7121 | return | |
7122 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
7123 | and then |
7124 | FCL (Component_Associations (E1), | |
7125 | Component_Associations (E2)); | |
996ae0b0 RK |
7126 | |
7127 | when N_Allocator => | |
7128 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
7129 | or else | |
7130 | Nkind (Expression (E2)) = N_Qualified_Expression | |
7131 | then | |
7132 | return FCE (Expression (E1), Expression (E2)); | |
7133 | ||
7134 | -- Check that the subtype marks and any constraints | |
7135 | -- are conformant | |
7136 | ||
7137 | else | |
7138 | declare | |
7139 | Indic1 : constant Node_Id := Expression (E1); | |
7140 | Indic2 : constant Node_Id := Expression (E2); | |
7141 | Elt1 : Node_Id; | |
7142 | Elt2 : Node_Id; | |
7143 | ||
7144 | begin | |
7145 | if Nkind (Indic1) /= N_Subtype_Indication then | |
7146 | return | |
7147 | Nkind (Indic2) /= N_Subtype_Indication | |
7148 | and then Entity (Indic1) = Entity (Indic2); | |
7149 | ||
7150 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
7151 | return | |
7152 | Nkind (Indic1) /= N_Subtype_Indication | |
7153 | and then Entity (Indic1) = Entity (Indic2); | |
7154 | ||
7155 | else | |
7156 | if Entity (Subtype_Mark (Indic1)) /= | |
7157 | Entity (Subtype_Mark (Indic2)) | |
7158 | then | |
7159 | return False; | |
7160 | end if; | |
7161 | ||
7162 | Elt1 := First (Constraints (Constraint (Indic1))); | |
7163 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
7164 | while Present (Elt1) and then Present (Elt2) loop |
7165 | if not FCE (Elt1, Elt2) then | |
7166 | return False; | |
7167 | end if; | |
7168 | ||
7169 | Next (Elt1); | |
7170 | Next (Elt2); | |
7171 | end loop; | |
7172 | ||
7173 | return True; | |
7174 | end if; | |
7175 | end; | |
7176 | end if; | |
7177 | ||
7178 | when N_Attribute_Reference => | |
7179 | return | |
7180 | Attribute_Name (E1) = Attribute_Name (E2) | |
7181 | and then FCL (Expressions (E1), Expressions (E2)); | |
7182 | ||
7183 | when N_Binary_Op => | |
7184 | return | |
7185 | Entity (E1) = Entity (E2) | |
7186 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7187 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7188 | ||
514d0fc5 | 7189 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
7190 | return |
7191 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
7192 | and then | |
7193 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
7194 | ||
19d846a0 RD |
7195 | when N_Case_Expression => |
7196 | declare | |
7197 | Alt1 : Node_Id; | |
7198 | Alt2 : Node_Id; | |
7199 | ||
7200 | begin | |
7201 | if not FCE (Expression (E1), Expression (E2)) then | |
7202 | return False; | |
7203 | ||
7204 | else | |
7205 | Alt1 := First (Alternatives (E1)); | |
7206 | Alt2 := First (Alternatives (E2)); | |
7207 | loop | |
7208 | if Present (Alt1) /= Present (Alt2) then | |
7209 | return False; | |
7210 | elsif No (Alt1) then | |
7211 | return True; | |
7212 | end if; | |
7213 | ||
7214 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
7215 | or else not FCL (Discrete_Choices (Alt1), | |
7216 | Discrete_Choices (Alt2)) | |
7217 | then | |
7218 | return False; | |
7219 | end if; | |
7220 | ||
7221 | Next (Alt1); | |
7222 | Next (Alt2); | |
7223 | end loop; | |
7224 | end if; | |
7225 | end; | |
7226 | ||
996ae0b0 RK |
7227 | when N_Character_Literal => |
7228 | return | |
7229 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
7230 | ||
7231 | when N_Component_Association => | |
7232 | return | |
7233 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
7234 | and then |
7235 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7236 | |
7237 | when N_Conditional_Expression => | |
7238 | return | |
7239 | FCL (Expressions (E1), Expressions (E2)); | |
7240 | ||
7241 | when N_Explicit_Dereference => | |
7242 | return | |
7243 | FCE (Prefix (E1), Prefix (E2)); | |
7244 | ||
7245 | when N_Extension_Aggregate => | |
7246 | return | |
7247 | FCL (Expressions (E1), Expressions (E2)) | |
7248 | and then Null_Record_Present (E1) = | |
7249 | Null_Record_Present (E2) | |
7250 | and then FCL (Component_Associations (E1), | |
7251 | Component_Associations (E2)); | |
7252 | ||
7253 | when N_Function_Call => | |
7254 | return | |
7255 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
7256 | and then |
7257 | FCL (Parameter_Associations (E1), | |
7258 | Parameter_Associations (E2)); | |
996ae0b0 RK |
7259 | |
7260 | when N_Indexed_Component => | |
7261 | return | |
7262 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7263 | and then |
7264 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
7265 | |
7266 | when N_Integer_Literal => | |
7267 | return (Intval (E1) = Intval (E2)); | |
7268 | ||
7269 | when N_Null => | |
7270 | return True; | |
7271 | ||
7272 | when N_Operator_Symbol => | |
7273 | return | |
7274 | Chars (E1) = Chars (E2); | |
7275 | ||
7276 | when N_Others_Choice => | |
7277 | return True; | |
7278 | ||
7279 | when N_Parameter_Association => | |
7280 | return | |
996ae0b0 RK |
7281 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
7282 | and then FCE (Explicit_Actual_Parameter (E1), | |
7283 | Explicit_Actual_Parameter (E2)); | |
7284 | ||
7285 | when N_Qualified_Expression => | |
7286 | return | |
7287 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7288 | and then |
7289 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 7290 | |
2010d078 AC |
7291 | when N_Quantified_Expression => |
7292 | if not FCE (Condition (E1), Condition (E2)) then | |
7293 | return False; | |
7294 | end if; | |
7295 | ||
7296 | if Present (Loop_Parameter_Specification (E1)) | |
7297 | and then Present (Loop_Parameter_Specification (E2)) | |
7298 | then | |
7299 | declare | |
7300 | L1 : constant Node_Id := | |
7301 | Loop_Parameter_Specification (E1); | |
7302 | L2 : constant Node_Id := | |
7303 | Loop_Parameter_Specification (E2); | |
7304 | ||
7305 | begin | |
7306 | return | |
7307 | Reverse_Present (L1) = Reverse_Present (L2) | |
7308 | and then | |
7309 | FCE (Defining_Identifier (L1), | |
7310 | Defining_Identifier (L2)) | |
7311 | and then | |
7312 | FCE (Discrete_Subtype_Definition (L1), | |
7313 | Discrete_Subtype_Definition (L2)); | |
7314 | end; | |
7315 | ||
7316 | else -- quantified expression with an iterator | |
7317 | declare | |
7318 | I1 : constant Node_Id := Iterator_Specification (E1); | |
7319 | I2 : constant Node_Id := Iterator_Specification (E2); | |
7320 | ||
7321 | begin | |
7322 | return | |
7323 | FCE (Defining_Identifier (I1), | |
7324 | Defining_Identifier (I2)) | |
7325 | and then | |
7326 | Of_Present (I1) = Of_Present (I2) | |
7327 | and then | |
7328 | Reverse_Present (I1) = Reverse_Present (I2) | |
7329 | and then FCE (Name (I1), Name (I2)) | |
7330 | and then FCE (Subtype_Indication (I1), | |
7331 | Subtype_Indication (I2)); | |
7332 | end; | |
7333 | end if; | |
7334 | ||
996ae0b0 RK |
7335 | when N_Range => |
7336 | return | |
7337 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
7338 | and then |
7339 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
7340 | |
7341 | when N_Real_Literal => | |
7342 | return (Realval (E1) = Realval (E2)); | |
7343 | ||
7344 | when N_Selected_Component => | |
7345 | return | |
7346 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7347 | and then |
7348 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
7349 | |
7350 | when N_Slice => | |
7351 | return | |
7352 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
7353 | and then |
7354 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
7355 | |
7356 | when N_String_Literal => | |
7357 | declare | |
7358 | S1 : constant String_Id := Strval (E1); | |
7359 | S2 : constant String_Id := Strval (E2); | |
7360 | L1 : constant Nat := String_Length (S1); | |
7361 | L2 : constant Nat := String_Length (S2); | |
7362 | ||
7363 | begin | |
7364 | if L1 /= L2 then | |
7365 | return False; | |
7366 | ||
7367 | else | |
7368 | for J in 1 .. L1 loop | |
7369 | if Get_String_Char (S1, J) /= | |
7370 | Get_String_Char (S2, J) | |
7371 | then | |
7372 | return False; | |
7373 | end if; | |
7374 | end loop; | |
7375 | ||
7376 | return True; | |
7377 | end if; | |
7378 | end; | |
7379 | ||
7380 | when N_Type_Conversion => | |
7381 | return | |
7382 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7383 | and then |
7384 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7385 | |
7386 | when N_Unary_Op => | |
7387 | return | |
7388 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
7389 | and then |
7390 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
7391 | |
7392 | when N_Unchecked_Type_Conversion => | |
7393 | return | |
7394 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
7395 | and then |
7396 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
7397 | |
7398 | -- All other node types cannot appear in this context. Strictly | |
7399 | -- we should raise a fatal internal error. Instead we just ignore | |
7400 | -- the nodes. This means that if anyone makes a mistake in the | |
7401 | -- expander and mucks an expression tree irretrievably, the | |
7402 | -- result will be a failure to detect a (probably very obscure) | |
7403 | -- case of non-conformance, which is better than bombing on some | |
7404 | -- case where two expressions do in fact conform. | |
7405 | ||
7406 | when others => | |
7407 | return True; | |
7408 | ||
7409 | end case; | |
7410 | end if; | |
7411 | end Fully_Conformant_Expressions; | |
7412 | ||
fbf5a39b AC |
7413 | ---------------------------------------- |
7414 | -- Fully_Conformant_Discrete_Subtypes -- | |
7415 | ---------------------------------------- | |
7416 | ||
7417 | function Fully_Conformant_Discrete_Subtypes | |
7418 | (Given_S1 : Node_Id; | |
d05ef0ab | 7419 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
7420 | is |
7421 | S1 : constant Node_Id := Original_Node (Given_S1); | |
7422 | S2 : constant Node_Id := Original_Node (Given_S2); | |
7423 | ||
7424 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
7425 | -- Special-case for a bound given by a discriminant, which in the body |
7426 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
7427 | |
7428 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 7429 | -- Check both bounds |
fbf5a39b | 7430 | |
5d37ba92 ES |
7431 | ----------------------- |
7432 | -- Conforming_Bounds -- | |
7433 | ----------------------- | |
7434 | ||
fbf5a39b AC |
7435 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
7436 | begin | |
7437 | if Is_Entity_Name (B1) | |
7438 | and then Is_Entity_Name (B2) | |
7439 | and then Ekind (Entity (B1)) = E_Discriminant | |
7440 | then | |
7441 | return Chars (B1) = Chars (B2); | |
7442 | ||
7443 | else | |
7444 | return Fully_Conformant_Expressions (B1, B2); | |
7445 | end if; | |
7446 | end Conforming_Bounds; | |
7447 | ||
5d37ba92 ES |
7448 | ----------------------- |
7449 | -- Conforming_Ranges -- | |
7450 | ----------------------- | |
7451 | ||
fbf5a39b AC |
7452 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
7453 | begin | |
7454 | return | |
7455 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
7456 | and then | |
7457 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
7458 | end Conforming_Ranges; | |
7459 | ||
7460 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
7461 | ||
7462 | begin | |
7463 | if Nkind (S1) /= Nkind (S2) then | |
7464 | return False; | |
7465 | ||
7466 | elsif Is_Entity_Name (S1) then | |
7467 | return Entity (S1) = Entity (S2); | |
7468 | ||
7469 | elsif Nkind (S1) = N_Range then | |
7470 | return Conforming_Ranges (S1, S2); | |
7471 | ||
7472 | elsif Nkind (S1) = N_Subtype_Indication then | |
7473 | return | |
7474 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
7475 | and then | |
7476 | Conforming_Ranges | |
7477 | (Range_Expression (Constraint (S1)), | |
7478 | Range_Expression (Constraint (S2))); | |
7479 | else | |
7480 | return True; | |
7481 | end if; | |
7482 | end Fully_Conformant_Discrete_Subtypes; | |
7483 | ||
996ae0b0 RK |
7484 | -------------------- |
7485 | -- Install_Entity -- | |
7486 | -------------------- | |
7487 | ||
7488 | procedure Install_Entity (E : Entity_Id) is | |
7489 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
7490 | begin |
7491 | Set_Is_Immediately_Visible (E); | |
7492 | Set_Current_Entity (E); | |
7493 | Set_Homonym (E, Prev); | |
7494 | end Install_Entity; | |
7495 | ||
7496 | --------------------- | |
7497 | -- Install_Formals -- | |
7498 | --------------------- | |
7499 | ||
7500 | procedure Install_Formals (Id : Entity_Id) is | |
7501 | F : Entity_Id; | |
996ae0b0 RK |
7502 | begin |
7503 | F := First_Formal (Id); | |
996ae0b0 RK |
7504 | while Present (F) loop |
7505 | Install_Entity (F); | |
7506 | Next_Formal (F); | |
7507 | end loop; | |
7508 | end Install_Formals; | |
7509 | ||
ce2b6ba5 JM |
7510 | ----------------------------- |
7511 | -- Is_Interface_Conformant -- | |
7512 | ----------------------------- | |
7513 | ||
7514 | function Is_Interface_Conformant | |
7515 | (Tagged_Type : Entity_Id; | |
7516 | Iface_Prim : Entity_Id; | |
7517 | Prim : Entity_Id) return Boolean | |
7518 | is | |
fceeaab6 ES |
7519 | Iface : constant Entity_Id := Find_Dispatching_Type (Iface_Prim); |
7520 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); | |
7521 | ||
25ebc085 AC |
7522 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
7523 | -- Return the controlling formal of Prim | |
7524 | ||
59e6b23c AC |
7525 | ------------------------ |
7526 | -- Controlling_Formal -- | |
7527 | ------------------------ | |
7528 | ||
25ebc085 AC |
7529 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
7530 | E : Entity_Id := First_Entity (Prim); | |
59e6b23c | 7531 | |
25ebc085 AC |
7532 | begin |
7533 | while Present (E) loop | |
7534 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
7535 | return E; | |
7536 | end if; | |
7537 | ||
7538 | Next_Entity (E); | |
7539 | end loop; | |
7540 | ||
7541 | return Empty; | |
7542 | end Controlling_Formal; | |
7543 | ||
7544 | -- Local variables | |
7545 | ||
7546 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
7547 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
7548 | ||
7549 | -- Start of processing for Is_Interface_Conformant | |
7550 | ||
ce2b6ba5 JM |
7551 | begin |
7552 | pragma Assert (Is_Subprogram (Iface_Prim) | |
7553 | and then Is_Subprogram (Prim) | |
7554 | and then Is_Dispatching_Operation (Iface_Prim) | |
7555 | and then Is_Dispatching_Operation (Prim)); | |
7556 | ||
fceeaab6 | 7557 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
7558 | or else (Present (Alias (Iface_Prim)) |
7559 | and then | |
7560 | Is_Interface | |
7561 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
7562 | ||
7563 | if Prim = Iface_Prim | |
7564 | or else not Is_Subprogram (Prim) | |
7565 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
7566 | or else not Is_Dispatching_Operation (Prim) | |
7567 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 ES |
7568 | or else No (Typ) |
7569 | or else Base_Type (Typ) /= Tagged_Type | |
ce2b6ba5 JM |
7570 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
7571 | then | |
7572 | return False; | |
7573 | ||
25ebc085 AC |
7574 | -- The mode of the controlling formals must match |
7575 | ||
7576 | elsif Present (Iface_Ctrl_F) | |
7577 | and then Present (Prim_Ctrl_F) | |
7578 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
7579 | then | |
7580 | return False; | |
7581 | ||
7582 | -- Case of a procedure, or a function whose result type matches the | |
7583 | -- result type of the interface primitive, or a function that has no | |
7584 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
7585 | |
7586 | elsif Ekind (Iface_Prim) = E_Procedure | |
7587 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 7588 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 7589 | then |
b4d7b435 AC |
7590 | return Type_Conformant |
7591 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 7592 | |
fceeaab6 ES |
7593 | -- Case of a function returning an interface, or an access to one. |
7594 | -- Check that the return types correspond. | |
ce2b6ba5 | 7595 | |
fceeaab6 ES |
7596 | elsif Implements_Interface (Typ, Iface) then |
7597 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
7598 | /= |
7599 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
7600 | then |
7601 | return False; | |
fceeaab6 ES |
7602 | else |
7603 | return | |
ce2b6ba5 JM |
7604 | Type_Conformant (Prim, Iface_Prim, |
7605 | Skip_Controlling_Formals => True); | |
fceeaab6 | 7606 | end if; |
ce2b6ba5 | 7607 | |
fceeaab6 ES |
7608 | else |
7609 | return False; | |
ce2b6ba5 | 7610 | end if; |
ce2b6ba5 JM |
7611 | end Is_Interface_Conformant; |
7612 | ||
996ae0b0 RK |
7613 | --------------------------------- |
7614 | -- Is_Non_Overriding_Operation -- | |
7615 | --------------------------------- | |
7616 | ||
7617 | function Is_Non_Overriding_Operation | |
7618 | (Prev_E : Entity_Id; | |
d05ef0ab | 7619 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
7620 | is |
7621 | Formal : Entity_Id; | |
7622 | F_Typ : Entity_Id; | |
7623 | G_Typ : Entity_Id := Empty; | |
7624 | ||
7625 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
7626 | -- If F_Type is a derived type associated with a generic actual subtype, |
7627 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
7628 | |
7629 | function Types_Correspond | |
7630 | (P_Type : Entity_Id; | |
d05ef0ab | 7631 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
7632 | -- Returns true if and only if the types (or designated types in the |
7633 | -- case of anonymous access types) are the same or N_Type is derived | |
7634 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
7635 | |
7636 | ----------------------------- | |
7637 | -- Get_Generic_Parent_Type -- | |
7638 | ----------------------------- | |
7639 | ||
7640 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
7641 | G_Typ : Entity_Id; | |
702d2020 | 7642 | Defn : Node_Id; |
996ae0b0 RK |
7643 | Indic : Node_Id; |
7644 | ||
7645 | begin | |
7646 | if Is_Derived_Type (F_Typ) | |
7647 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
7648 | then | |
82c80734 RD |
7649 | -- The tree must be traversed to determine the parent subtype in |
7650 | -- the generic unit, which unfortunately isn't always available | |
7651 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
7652 | -- is needed for cases where a full derived type has been | |
7653 | -- rewritten.) | |
996ae0b0 | 7654 | |
702d2020 AC |
7655 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); |
7656 | if Nkind (Defn) = N_Derived_Type_Definition then | |
7657 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 7658 | |
702d2020 AC |
7659 | if Nkind (Indic) = N_Subtype_Indication then |
7660 | G_Typ := Entity (Subtype_Mark (Indic)); | |
7661 | else | |
7662 | G_Typ := Entity (Indic); | |
7663 | end if; | |
996ae0b0 | 7664 | |
702d2020 AC |
7665 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
7666 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
7667 | then | |
7668 | return Generic_Parent_Type (Parent (G_Typ)); | |
7669 | end if; | |
996ae0b0 RK |
7670 | end if; |
7671 | end if; | |
7672 | ||
7673 | return Empty; | |
7674 | end Get_Generic_Parent_Type; | |
7675 | ||
7676 | ---------------------- | |
7677 | -- Types_Correspond -- | |
7678 | ---------------------- | |
7679 | ||
7680 | function Types_Correspond | |
7681 | (P_Type : Entity_Id; | |
d05ef0ab | 7682 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
7683 | is |
7684 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
7685 | New_Type : Entity_Id := Base_Type (N_Type); | |
7686 | ||
7687 | begin | |
7688 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
7689 | Prev_Type := Designated_Type (Prev_Type); | |
7690 | end if; | |
7691 | ||
7692 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
7693 | New_Type := Designated_Type (New_Type); | |
7694 | end if; | |
7695 | ||
7696 | if Prev_Type = New_Type then | |
7697 | return True; | |
7698 | ||
7699 | elsif not Is_Class_Wide_Type (New_Type) then | |
7700 | while Etype (New_Type) /= New_Type loop | |
7701 | New_Type := Etype (New_Type); | |
7702 | if New_Type = Prev_Type then | |
7703 | return True; | |
7704 | end if; | |
7705 | end loop; | |
7706 | end if; | |
7707 | return False; | |
7708 | end Types_Correspond; | |
7709 | ||
7710 | -- Start of processing for Is_Non_Overriding_Operation | |
7711 | ||
7712 | begin | |
82c80734 RD |
7713 | -- In the case where both operations are implicit derived subprograms |
7714 | -- then neither overrides the other. This can only occur in certain | |
7715 | -- obscure cases (e.g., derivation from homographs created in a generic | |
7716 | -- instantiation). | |
996ae0b0 RK |
7717 | |
7718 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
7719 | return True; | |
7720 | ||
7721 | elsif Ekind (Current_Scope) = E_Package | |
7722 | and then Is_Generic_Instance (Current_Scope) | |
7723 | and then In_Private_Part (Current_Scope) | |
7724 | and then Comes_From_Source (New_E) | |
7725 | then | |
702d2020 AC |
7726 | -- We examine the formals and result type of the inherited operation, |
7727 | -- to determine whether their type is derived from (the instance of) | |
7728 | -- a generic type. The first such formal or result type is the one | |
7729 | -- tested. | |
996ae0b0 RK |
7730 | |
7731 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
7732 | while Present (Formal) loop |
7733 | F_Typ := Base_Type (Etype (Formal)); | |
7734 | ||
7735 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
7736 | F_Typ := Designated_Type (F_Typ); | |
7737 | end if; | |
7738 | ||
7739 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 7740 | exit when Present (G_Typ); |
996ae0b0 RK |
7741 | |
7742 | Next_Formal (Formal); | |
7743 | end loop; | |
7744 | ||
c8ef728f | 7745 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
7746 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
7747 | end if; | |
7748 | ||
7749 | if No (G_Typ) then | |
7750 | return False; | |
7751 | end if; | |
7752 | ||
8dbd1460 AC |
7753 | -- If the generic type is a private type, then the original operation |
7754 | -- was not overriding in the generic, because there was no primitive | |
7755 | -- operation to override. | |
996ae0b0 RK |
7756 | |
7757 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
7758 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 7759 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
7760 | then |
7761 | return True; | |
7762 | ||
7763 | -- The generic parent type is the ancestor of a formal derived | |
7764 | -- type declaration. We need to check whether it has a primitive | |
7765 | -- operation that should be overridden by New_E in the generic. | |
7766 | ||
7767 | else | |
7768 | declare | |
7769 | P_Formal : Entity_Id; | |
7770 | N_Formal : Entity_Id; | |
7771 | P_Typ : Entity_Id; | |
7772 | N_Typ : Entity_Id; | |
7773 | P_Prim : Entity_Id; | |
7774 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
7775 | ||
7776 | begin | |
7777 | while Present (Prim_Elt) loop | |
7778 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 7779 | |
996ae0b0 RK |
7780 | if Chars (P_Prim) = Chars (New_E) |
7781 | and then Ekind (P_Prim) = Ekind (New_E) | |
7782 | then | |
7783 | P_Formal := First_Formal (P_Prim); | |
7784 | N_Formal := First_Formal (New_E); | |
7785 | while Present (P_Formal) and then Present (N_Formal) loop | |
7786 | P_Typ := Etype (P_Formal); | |
7787 | N_Typ := Etype (N_Formal); | |
7788 | ||
7789 | if not Types_Correspond (P_Typ, N_Typ) then | |
7790 | exit; | |
7791 | end if; | |
7792 | ||
7793 | Next_Entity (P_Formal); | |
7794 | Next_Entity (N_Formal); | |
7795 | end loop; | |
7796 | ||
82c80734 RD |
7797 | -- Found a matching primitive operation belonging to the |
7798 | -- formal ancestor type, so the new subprogram is | |
7799 | -- overriding. | |
996ae0b0 | 7800 | |
c8ef728f ES |
7801 | if No (P_Formal) |
7802 | and then No (N_Formal) | |
996ae0b0 RK |
7803 | and then (Ekind (New_E) /= E_Function |
7804 | or else | |
7805 | Types_Correspond | |
7806 | (Etype (P_Prim), Etype (New_E))) | |
7807 | then | |
7808 | return False; | |
7809 | end if; | |
7810 | end if; | |
7811 | ||
7812 | Next_Elmt (Prim_Elt); | |
7813 | end loop; | |
7814 | ||
82c80734 RD |
7815 | -- If no match found, then the new subprogram does not |
7816 | -- override in the generic (nor in the instance). | |
996ae0b0 RK |
7817 | |
7818 | return True; | |
7819 | end; | |
7820 | end if; | |
7821 | else | |
7822 | return False; | |
7823 | end if; | |
7824 | end Is_Non_Overriding_Operation; | |
7825 | ||
beacce02 AC |
7826 | ------------------------------------- |
7827 | -- List_Inherited_Pre_Post_Aspects -- | |
7828 | ------------------------------------- | |
7829 | ||
7830 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
7831 | begin | |
e606088a | 7832 | if Opt.List_Inherited_Aspects |
beacce02 AC |
7833 | and then (Is_Subprogram (E) or else Is_Generic_Subprogram (E)) |
7834 | then | |
7835 | declare | |
7836 | Inherited : constant Subprogram_List := | |
7837 | Inherited_Subprograms (E); | |
7838 | P : Node_Id; | |
7839 | ||
7840 | begin | |
7841 | for J in Inherited'Range loop | |
dac3bede YM |
7842 | P := Spec_PPC_List (Contract (Inherited (J))); |
7843 | ||
beacce02 AC |
7844 | while Present (P) loop |
7845 | Error_Msg_Sloc := Sloc (P); | |
7846 | ||
7847 | if Class_Present (P) and then not Split_PPC (P) then | |
7848 | if Pragma_Name (P) = Name_Precondition then | |
7849 | Error_Msg_N | |
7850 | ("?info: & inherits `Pre''Class` aspect from #", E); | |
7851 | else | |
7852 | Error_Msg_N | |
7853 | ("?info: & inherits `Post''Class` aspect from #", E); | |
7854 | end if; | |
7855 | end if; | |
7856 | ||
7857 | P := Next_Pragma (P); | |
7858 | end loop; | |
7859 | end loop; | |
7860 | end; | |
7861 | end if; | |
7862 | end List_Inherited_Pre_Post_Aspects; | |
7863 | ||
996ae0b0 RK |
7864 | ------------------------------ |
7865 | -- Make_Inequality_Operator -- | |
7866 | ------------------------------ | |
7867 | ||
7868 | -- S is the defining identifier of an equality operator. We build a | |
7869 | -- subprogram declaration with the right signature. This operation is | |
7870 | -- intrinsic, because it is always expanded as the negation of the | |
7871 | -- call to the equality function. | |
7872 | ||
7873 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
7874 | Loc : constant Source_Ptr := Sloc (S); | |
7875 | Decl : Node_Id; | |
7876 | Formals : List_Id; | |
7877 | Op_Name : Entity_Id; | |
7878 | ||
c8ef728f ES |
7879 | FF : constant Entity_Id := First_Formal (S); |
7880 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
7881 | |
7882 | begin | |
c8ef728f | 7883 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 7884 | |
c8ef728f | 7885 | if No (NF) then |
996ae0b0 RK |
7886 | return; |
7887 | end if; | |
7888 | ||
c8ef728f ES |
7889 | declare |
7890 | A : constant Entity_Id := | |
7891 | Make_Defining_Identifier (Sloc (FF), | |
7892 | Chars => Chars (FF)); | |
7893 | ||
5d37ba92 ES |
7894 | B : constant Entity_Id := |
7895 | Make_Defining_Identifier (Sloc (NF), | |
7896 | Chars => Chars (NF)); | |
c8ef728f ES |
7897 | |
7898 | begin | |
7899 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
7900 | ||
7901 | Formals := New_List ( | |
7902 | Make_Parameter_Specification (Loc, | |
7903 | Defining_Identifier => A, | |
7904 | Parameter_Type => | |
7905 | New_Reference_To (Etype (First_Formal (S)), | |
7906 | Sloc (Etype (First_Formal (S))))), | |
7907 | ||
7908 | Make_Parameter_Specification (Loc, | |
7909 | Defining_Identifier => B, | |
7910 | Parameter_Type => | |
7911 | New_Reference_To (Etype (Next_Formal (First_Formal (S))), | |
7912 | Sloc (Etype (Next_Formal (First_Formal (S))))))); | |
7913 | ||
7914 | Decl := | |
7915 | Make_Subprogram_Declaration (Loc, | |
7916 | Specification => | |
7917 | Make_Function_Specification (Loc, | |
7918 | Defining_Unit_Name => Op_Name, | |
7919 | Parameter_Specifications => Formals, | |
7920 | Result_Definition => | |
7921 | New_Reference_To (Standard_Boolean, Loc))); | |
7922 | ||
7923 | -- Insert inequality right after equality if it is explicit or after | |
7924 | -- the derived type when implicit. These entities are created only | |
7925 | -- for visibility purposes, and eventually replaced in the course of | |
7926 | -- expansion, so they do not need to be attached to the tree and seen | |
7927 | -- by the back-end. Keeping them internal also avoids spurious | |
7928 | -- freezing problems. The declaration is inserted in the tree for | |
7929 | -- analysis, and removed afterwards. If the equality operator comes | |
7930 | -- from an explicit declaration, attach the inequality immediately | |
7931 | -- after. Else the equality is inherited from a derived type | |
7932 | -- declaration, so insert inequality after that declaration. | |
7933 | ||
7934 | if No (Alias (S)) then | |
7935 | Insert_After (Unit_Declaration_Node (S), Decl); | |
7936 | elsif Is_List_Member (Parent (S)) then | |
7937 | Insert_After (Parent (S), Decl); | |
7938 | else | |
7939 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
7940 | end if; | |
996ae0b0 | 7941 | |
c8ef728f ES |
7942 | Mark_Rewrite_Insertion (Decl); |
7943 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
7944 | Analyze (Decl); | |
7945 | Remove (Decl); | |
7946 | Set_Has_Completion (Op_Name); | |
7947 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 7948 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 7949 | end; |
996ae0b0 RK |
7950 | end Make_Inequality_Operator; |
7951 | ||
7952 | ---------------------- | |
7953 | -- May_Need_Actuals -- | |
7954 | ---------------------- | |
7955 | ||
7956 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
7957 | F : Entity_Id; | |
7958 | B : Boolean; | |
7959 | ||
7960 | begin | |
7961 | F := First_Formal (Fun); | |
7962 | B := True; | |
996ae0b0 RK |
7963 | while Present (F) loop |
7964 | if No (Default_Value (F)) then | |
7965 | B := False; | |
7966 | exit; | |
7967 | end if; | |
7968 | ||
7969 | Next_Formal (F); | |
7970 | end loop; | |
7971 | ||
7972 | Set_Needs_No_Actuals (Fun, B); | |
7973 | end May_Need_Actuals; | |
7974 | ||
7975 | --------------------- | |
7976 | -- Mode_Conformant -- | |
7977 | --------------------- | |
7978 | ||
7979 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
7980 | Result : Boolean; | |
996ae0b0 RK |
7981 | begin |
7982 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
7983 | return Result; | |
7984 | end Mode_Conformant; | |
7985 | ||
7986 | --------------------------- | |
7987 | -- New_Overloaded_Entity -- | |
7988 | --------------------------- | |
7989 | ||
7990 | procedure New_Overloaded_Entity | |
7991 | (S : Entity_Id; | |
7992 | Derived_Type : Entity_Id := Empty) | |
7993 | is | |
ec4867fa | 7994 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
7995 | -- Set if the current scope has an operation that is type-conformant |
7996 | -- with S, and becomes hidden by S. | |
7997 | ||
5d37ba92 ES |
7998 | Is_Primitive_Subp : Boolean; |
7999 | -- Set to True if the new subprogram is primitive | |
8000 | ||
fbf5a39b AC |
8001 | E : Entity_Id; |
8002 | -- Entity that S overrides | |
8003 | ||
996ae0b0 | 8004 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
8005 | -- Predecessor of E in Homonym chain |
8006 | ||
5d37ba92 ES |
8007 | procedure Check_For_Primitive_Subprogram |
8008 | (Is_Primitive : out Boolean; | |
8009 | Is_Overriding : Boolean := False); | |
8010 | -- If the subprogram being analyzed is a primitive operation of the type | |
8011 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
8012 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
8013 | -- corresponding flag on the entity itself for later use. | |
8014 | ||
ec4867fa ES |
8015 | procedure Check_Synchronized_Overriding |
8016 | (Def_Id : Entity_Id; | |
ec4867fa ES |
8017 | Overridden_Subp : out Entity_Id); |
8018 | -- First determine if Def_Id is an entry or a subprogram either defined | |
8019 | -- in the scope of a task or protected type, or is a primitive of such | |
8020 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
8021 | -- implemented by the synchronized type, return the overridden entity | |
8022 | -- or Empty. | |
758c442c | 8023 | |
996ae0b0 RK |
8024 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
8025 | -- Check that E is declared in the private part of the current package, | |
8026 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 8027 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
8028 | -- set when freezing entities, so we must examine the place of the |
8029 | -- declaration in the tree, and recognize wrapper packages as well. | |
8030 | ||
2ddc2000 AC |
8031 | function Is_Overriding_Alias |
8032 | (Old_E : Entity_Id; | |
8033 | New_E : Entity_Id) return Boolean; | |
8034 | -- Check whether new subprogram and old subprogram are both inherited | |
8035 | -- from subprograms that have distinct dispatch table entries. This can | |
8036 | -- occur with derivations from instances with accidental homonyms. | |
8037 | -- The function is conservative given that the converse is only true | |
8038 | -- within instances that contain accidental overloadings. | |
8039 | ||
5d37ba92 ES |
8040 | ------------------------------------ |
8041 | -- Check_For_Primitive_Subprogram -- | |
8042 | ------------------------------------ | |
996ae0b0 | 8043 | |
5d37ba92 ES |
8044 | procedure Check_For_Primitive_Subprogram |
8045 | (Is_Primitive : out Boolean; | |
8046 | Is_Overriding : Boolean := False) | |
ec4867fa | 8047 | is |
996ae0b0 RK |
8048 | Formal : Entity_Id; |
8049 | F_Typ : Entity_Id; | |
07fc65c4 | 8050 | B_Typ : Entity_Id; |
996ae0b0 RK |
8051 | |
8052 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
8053 | -- Returns true if T is declared in the visible part of the current |
8054 | -- package scope; otherwise returns false. Assumes that T is declared | |
8055 | -- in a package. | |
996ae0b0 RK |
8056 | |
8057 | procedure Check_Private_Overriding (T : Entity_Id); | |
8058 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
8059 | -- abstract type is declared in a private part, then it must override |
8060 | -- an abstract subprogram declared in the visible part. Also checks | |
8061 | -- that if a primitive function with a controlling result is declared | |
8062 | -- in a private part, then it must override a function declared in | |
8063 | -- the visible part. | |
996ae0b0 RK |
8064 | |
8065 | ------------------------------ | |
8066 | -- Check_Private_Overriding -- | |
8067 | ------------------------------ | |
8068 | ||
8069 | procedure Check_Private_Overriding (T : Entity_Id) is | |
8070 | begin | |
51c16e29 | 8071 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
8072 | and then In_Private_Part (Current_Scope) |
8073 | and then Visible_Part_Type (T) | |
8074 | and then not In_Instance | |
8075 | then | |
f937473f RD |
8076 | if Is_Abstract_Type (T) |
8077 | and then Is_Abstract_Subprogram (S) | |
8078 | and then (not Is_Overriding | |
8dbd1460 | 8079 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 8080 | then |
ed2233dc | 8081 | Error_Msg_N |
19d846a0 RD |
8082 | ("abstract subprograms must be visible " |
8083 | & "(RM 3.9.3(10))!", S); | |
758c442c | 8084 | |
996ae0b0 | 8085 | elsif Ekind (S) = E_Function |
82c80734 | 8086 | and then not Is_Overriding |
996ae0b0 | 8087 | then |
2e79de51 AC |
8088 | if Is_Tagged_Type (T) |
8089 | and then T = Base_Type (Etype (S)) | |
8090 | then | |
8091 | Error_Msg_N | |
8092 | ("private function with tagged result must" | |
8093 | & " override visible-part function", S); | |
8094 | Error_Msg_N | |
8095 | ("\move subprogram to the visible part" | |
8096 | & " (RM 3.9.3(10))", S); | |
8097 | ||
8098 | -- AI05-0073: extend this test to the case of a function | |
8099 | -- with a controlling access result. | |
8100 | ||
8101 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
8102 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
8103 | and then | |
8104 | not Is_Class_Wide_Type (Designated_Type (Etype (S))) | |
dbe945f1 | 8105 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
8106 | then |
8107 | Error_Msg_N | |
8108 | ("private function with controlling access result " | |
8109 | & "must override visible-part function", S); | |
8110 | Error_Msg_N | |
8111 | ("\move subprogram to the visible part" | |
8112 | & " (RM 3.9.3(10))", S); | |
8113 | end if; | |
996ae0b0 RK |
8114 | end if; |
8115 | end if; | |
8116 | end Check_Private_Overriding; | |
8117 | ||
8118 | ----------------------- | |
8119 | -- Visible_Part_Type -- | |
8120 | ----------------------- | |
8121 | ||
8122 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
8123 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
8124 | N : Node_Id; | |
996ae0b0 RK |
8125 | |
8126 | begin | |
8dbd1460 AC |
8127 | -- If the entity is a private type, then it must be declared in a |
8128 | -- visible part. | |
996ae0b0 RK |
8129 | |
8130 | if Ekind (T) in Private_Kind then | |
8131 | return True; | |
8132 | end if; | |
8133 | ||
8134 | -- Otherwise, we traverse the visible part looking for its | |
8135 | -- corresponding declaration. We cannot use the declaration | |
8136 | -- node directly because in the private part the entity of a | |
8137 | -- private type is the one in the full view, which does not | |
8138 | -- indicate that it is the completion of something visible. | |
8139 | ||
07fc65c4 | 8140 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
8141 | while Present (N) loop |
8142 | if Nkind (N) = N_Full_Type_Declaration | |
8143 | and then Present (Defining_Identifier (N)) | |
8144 | and then T = Defining_Identifier (N) | |
8145 | then | |
8146 | return True; | |
8147 | ||
800621e0 RD |
8148 | elsif Nkind_In (N, N_Private_Type_Declaration, |
8149 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
8150 | and then Present (Defining_Identifier (N)) |
8151 | and then T = Full_View (Defining_Identifier (N)) | |
8152 | then | |
8153 | return True; | |
8154 | end if; | |
8155 | ||
8156 | Next (N); | |
8157 | end loop; | |
8158 | ||
8159 | return False; | |
8160 | end Visible_Part_Type; | |
8161 | ||
5d37ba92 | 8162 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
8163 | |
8164 | begin | |
5d37ba92 ES |
8165 | Is_Primitive := False; |
8166 | ||
996ae0b0 RK |
8167 | if not Comes_From_Source (S) then |
8168 | null; | |
8169 | ||
5d37ba92 | 8170 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
8171 | |
8172 | elsif Current_Scope = Standard_Standard then | |
8173 | null; | |
8174 | ||
b9b2405f | 8175 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 8176 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 8177 | or else Is_Overriding |
996ae0b0 | 8178 | then |
07fc65c4 | 8179 | -- For function, check return type |
996ae0b0 | 8180 | |
07fc65c4 | 8181 | if Ekind (S) = E_Function then |
5d37ba92 ES |
8182 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
8183 | F_Typ := Designated_Type (Etype (S)); | |
8184 | else | |
8185 | F_Typ := Etype (S); | |
8186 | end if; | |
8187 | ||
8188 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 8189 | |
5d37ba92 ES |
8190 | if Scope (B_Typ) = Current_Scope |
8191 | and then not Is_Class_Wide_Type (B_Typ) | |
8192 | and then not Is_Generic_Type (B_Typ) | |
8193 | then | |
8194 | Is_Primitive := True; | |
07fc65c4 | 8195 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 8196 | Set_Is_Primitive (S); |
07fc65c4 GB |
8197 | Check_Private_Overriding (B_Typ); |
8198 | end if; | |
996ae0b0 RK |
8199 | end if; |
8200 | ||
07fc65c4 | 8201 | -- For all subprograms, check formals |
996ae0b0 | 8202 | |
07fc65c4 | 8203 | Formal := First_Formal (S); |
996ae0b0 RK |
8204 | while Present (Formal) loop |
8205 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
8206 | F_Typ := Designated_Type (Etype (Formal)); | |
8207 | else | |
8208 | F_Typ := Etype (Formal); | |
8209 | end if; | |
8210 | ||
07fc65c4 GB |
8211 | B_Typ := Base_Type (F_Typ); |
8212 | ||
ec4867fa ES |
8213 | if Ekind (B_Typ) = E_Access_Subtype then |
8214 | B_Typ := Base_Type (B_Typ); | |
8215 | end if; | |
8216 | ||
5d37ba92 ES |
8217 | if Scope (B_Typ) = Current_Scope |
8218 | and then not Is_Class_Wide_Type (B_Typ) | |
8219 | and then not Is_Generic_Type (B_Typ) | |
8220 | then | |
8221 | Is_Primitive := True; | |
8222 | Set_Is_Primitive (S); | |
07fc65c4 GB |
8223 | Set_Has_Primitive_Operations (B_Typ); |
8224 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
8225 | end if; |
8226 | ||
8227 | Next_Formal (Formal); | |
8228 | end loop; | |
996ae0b0 | 8229 | end if; |
5d37ba92 ES |
8230 | end Check_For_Primitive_Subprogram; |
8231 | ||
8232 | ----------------------------------- | |
8233 | -- Check_Synchronized_Overriding -- | |
8234 | ----------------------------------- | |
8235 | ||
8236 | procedure Check_Synchronized_Overriding | |
8237 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
8238 | Overridden_Subp : out Entity_Id) |
8239 | is | |
5d37ba92 ES |
8240 | Ifaces_List : Elist_Id; |
8241 | In_Scope : Boolean; | |
8242 | Typ : Entity_Id; | |
8243 | ||
8aa15e3b JM |
8244 | function Matches_Prefixed_View_Profile |
8245 | (Prim_Params : List_Id; | |
8246 | Iface_Params : List_Id) return Boolean; | |
8247 | -- Determine whether a subprogram's parameter profile Prim_Params | |
8248 | -- matches that of a potentially overridden interface subprogram | |
8249 | -- Iface_Params. Also determine if the type of first parameter of | |
8250 | -- Iface_Params is an implemented interface. | |
8251 | ||
8aa15e3b JM |
8252 | ----------------------------------- |
8253 | -- Matches_Prefixed_View_Profile -- | |
8254 | ----------------------------------- | |
8255 | ||
8256 | function Matches_Prefixed_View_Profile | |
8257 | (Prim_Params : List_Id; | |
8258 | Iface_Params : List_Id) return Boolean | |
8259 | is | |
8260 | Iface_Id : Entity_Id; | |
8261 | Iface_Param : Node_Id; | |
8262 | Iface_Typ : Entity_Id; | |
8263 | Prim_Id : Entity_Id; | |
8264 | Prim_Param : Node_Id; | |
8265 | Prim_Typ : Entity_Id; | |
8266 | ||
8267 | function Is_Implemented | |
8268 | (Ifaces_List : Elist_Id; | |
8269 | Iface : Entity_Id) return Boolean; | |
8270 | -- Determine if Iface is implemented by the current task or | |
8271 | -- protected type. | |
8272 | ||
8273 | -------------------- | |
8274 | -- Is_Implemented -- | |
8275 | -------------------- | |
8276 | ||
8277 | function Is_Implemented | |
8278 | (Ifaces_List : Elist_Id; | |
8279 | Iface : Entity_Id) return Boolean | |
8280 | is | |
8281 | Iface_Elmt : Elmt_Id; | |
8282 | ||
8283 | begin | |
8284 | Iface_Elmt := First_Elmt (Ifaces_List); | |
8285 | while Present (Iface_Elmt) loop | |
8286 | if Node (Iface_Elmt) = Iface then | |
8287 | return True; | |
8288 | end if; | |
8289 | ||
8290 | Next_Elmt (Iface_Elmt); | |
8291 | end loop; | |
8292 | ||
8293 | return False; | |
8294 | end Is_Implemented; | |
8295 | ||
8296 | -- Start of processing for Matches_Prefixed_View_Profile | |
8297 | ||
8298 | begin | |
8299 | Iface_Param := First (Iface_Params); | |
8300 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
8301 | ||
8302 | if Is_Access_Type (Iface_Typ) then | |
8303 | Iface_Typ := Designated_Type (Iface_Typ); | |
8304 | end if; | |
8305 | ||
8306 | Prim_Param := First (Prim_Params); | |
8307 | ||
8308 | -- The first parameter of the potentially overridden subprogram | |
8309 | -- must be an interface implemented by Prim. | |
8310 | ||
8311 | if not Is_Interface (Iface_Typ) | |
8312 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
8313 | then | |
8314 | return False; | |
8315 | end if; | |
8316 | ||
8317 | -- The checks on the object parameters are done, move onto the | |
8318 | -- rest of the parameters. | |
8319 | ||
8320 | if not In_Scope then | |
8321 | Prim_Param := Next (Prim_Param); | |
8322 | end if; | |
8323 | ||
8324 | Iface_Param := Next (Iface_Param); | |
8325 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
8326 | Iface_Id := Defining_Identifier (Iface_Param); | |
8327 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
8328 | ||
8aa15e3b JM |
8329 | Prim_Id := Defining_Identifier (Prim_Param); |
8330 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
8331 | ||
15e4986c JM |
8332 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
8333 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
8334 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
8335 | then | |
8336 | Iface_Typ := Designated_Type (Iface_Typ); | |
8337 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
8338 | end if; |
8339 | ||
8340 | -- Case of multiple interface types inside a parameter profile | |
8341 | ||
8342 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
8343 | ||
8344 | -- If the interface type is implemented, then the matching type | |
8345 | -- in the primitive should be the implementing record type. | |
8346 | ||
8347 | if Ekind (Iface_Typ) = E_Record_Type | |
8348 | and then Is_Interface (Iface_Typ) | |
8349 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
8350 | then | |
8351 | if Prim_Typ /= Typ then | |
8352 | return False; | |
8353 | end if; | |
8354 | ||
8355 | -- The two parameters must be both mode and subtype conformant | |
8356 | ||
8357 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
8358 | or else not | |
8359 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
8360 | then | |
8361 | return False; | |
8362 | end if; | |
8363 | ||
8364 | Next (Iface_Param); | |
8365 | Next (Prim_Param); | |
8366 | end loop; | |
8367 | ||
8368 | -- One of the two lists contains more parameters than the other | |
8369 | ||
8370 | if Present (Iface_Param) or else Present (Prim_Param) then | |
8371 | return False; | |
8372 | end if; | |
8373 | ||
8374 | return True; | |
8375 | end Matches_Prefixed_View_Profile; | |
8376 | ||
8377 | -- Start of processing for Check_Synchronized_Overriding | |
8378 | ||
5d37ba92 ES |
8379 | begin |
8380 | Overridden_Subp := Empty; | |
8381 | ||
8aa15e3b JM |
8382 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
8383 | -- primitives internally generated by the frontend; however at this | |
8384 | -- stage predefined primitives are still not fully decorated. As a | |
8385 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 8386 | |
8aa15e3b JM |
8387 | if (Ekind (Def_Id) /= E_Entry |
8388 | and then Ekind (Def_Id) /= E_Function | |
8389 | and then Ekind (Def_Id) /= E_Procedure) | |
8390 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
8391 | then |
8392 | return; | |
8393 | end if; | |
8394 | ||
8395 | -- Search for the concurrent declaration since it contains the list | |
8396 | -- of all implemented interfaces. In this case, the subprogram is | |
8397 | -- declared within the scope of a protected or a task type. | |
8398 | ||
8399 | if Present (Scope (Def_Id)) | |
8400 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
8401 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
8402 | then | |
8403 | Typ := Scope (Def_Id); | |
8404 | In_Scope := True; | |
8405 | ||
8aa15e3b | 8406 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 8407 | -- has no formals. |
8aa15e3b JM |
8408 | |
8409 | elsif No (First_Formal (Def_Id)) then | |
8410 | return; | |
5d37ba92 | 8411 | |
8aa15e3b | 8412 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 8413 | -- concurrent type. |
5d37ba92 | 8414 | |
8aa15e3b JM |
8415 | else |
8416 | Typ := Etype (First_Formal (Def_Id)); | |
8417 | ||
8418 | if Is_Access_Type (Typ) then | |
8419 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
8420 | end if; |
8421 | ||
8aa15e3b JM |
8422 | if Is_Concurrent_Type (Typ) |
8423 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 8424 | then |
5d37ba92 ES |
8425 | In_Scope := False; |
8426 | ||
8427 | -- This case occurs when the concurrent type is declared within | |
8428 | -- a generic unit. As a result the corresponding record has been | |
8429 | -- built and used as the type of the first formal, we just have | |
8430 | -- to retrieve the corresponding concurrent type. | |
8431 | ||
8aa15e3b | 8432 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 8433 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 8434 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 8435 | then |
8aa15e3b | 8436 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
8437 | In_Scope := False; |
8438 | ||
8439 | else | |
8440 | return; | |
8441 | end if; | |
8aa15e3b JM |
8442 | end if; |
8443 | ||
8444 | -- There is no overriding to check if is an inherited operation in a | |
8445 | -- type derivation on for a generic actual. | |
8446 | ||
8447 | Collect_Interfaces (Typ, Ifaces_List); | |
8448 | ||
8449 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
8450 | return; |
8451 | end if; | |
8452 | ||
8aa15e3b JM |
8453 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
8454 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 8455 | |
8aa15e3b JM |
8456 | declare |
8457 | Candidate : Entity_Id := Empty; | |
8458 | Hom : Entity_Id := Empty; | |
8459 | Iface_Typ : Entity_Id; | |
8460 | Subp : Entity_Id := Empty; | |
8461 | ||
8462 | begin | |
4adf3c50 | 8463 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
8464 | -- overridden subprogram that belongs to an implemented |
8465 | -- interface. | |
8466 | ||
8467 | Hom := Current_Entity_In_Scope (Def_Id); | |
8468 | while Present (Hom) loop | |
8469 | Subp := Hom; | |
8470 | ||
15e4986c JM |
8471 | if Subp = Def_Id |
8472 | or else not Is_Overloadable (Subp) | |
8473 | or else not Is_Primitive (Subp) | |
8474 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 8475 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 8476 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 8477 | then |
15e4986c | 8478 | null; |
8aa15e3b | 8479 | |
15e4986c | 8480 | -- Entries and procedures can override abstract or null |
4adf3c50 | 8481 | -- interface procedures. |
8aa15e3b | 8482 | |
15e4986c JM |
8483 | elsif (Ekind (Def_Id) = E_Procedure |
8484 | or else Ekind (Def_Id) = E_Entry) | |
8aa15e3b | 8485 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
8486 | and then Matches_Prefixed_View_Profile |
8487 | (Parameter_Specifications (Parent (Def_Id)), | |
8488 | Parameter_Specifications (Parent (Subp))) | |
8489 | then | |
8490 | Candidate := Subp; | |
8491 | ||
15e4986c JM |
8492 | -- For an overridden subprogram Subp, check whether the mode |
8493 | -- of its first parameter is correct depending on the kind | |
8494 | -- of synchronized type. | |
8aa15e3b | 8495 | |
15e4986c JM |
8496 | declare |
8497 | Formal : constant Node_Id := First_Formal (Candidate); | |
8498 | ||
8499 | begin | |
8500 | -- In order for an entry or a protected procedure to | |
8501 | -- override, the first parameter of the overridden | |
8502 | -- routine must be of mode "out", "in out" or | |
8503 | -- access-to-variable. | |
8504 | ||
8505 | if (Ekind (Candidate) = E_Entry | |
8506 | or else Ekind (Candidate) = E_Procedure) | |
8507 | and then Is_Protected_Type (Typ) | |
8508 | and then Ekind (Formal) /= E_In_Out_Parameter | |
8509 | and then Ekind (Formal) /= E_Out_Parameter | |
8510 | and then Nkind (Parameter_Type (Parent (Formal))) | |
8511 | /= N_Access_Definition | |
8512 | then | |
8513 | null; | |
8514 | ||
8515 | -- All other cases are OK since a task entry or routine | |
8516 | -- does not have a restriction on the mode of the first | |
8517 | -- parameter of the overridden interface routine. | |
8518 | ||
8519 | else | |
8520 | Overridden_Subp := Candidate; | |
8521 | return; | |
8522 | end if; | |
8523 | end; | |
8aa15e3b JM |
8524 | |
8525 | -- Functions can override abstract interface functions | |
8526 | ||
8527 | elsif Ekind (Def_Id) = E_Function | |
8528 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
8529 | and then Matches_Prefixed_View_Profile |
8530 | (Parameter_Specifications (Parent (Def_Id)), | |
8531 | Parameter_Specifications (Parent (Subp))) | |
8532 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
8533 | Etype (Result_Definition (Parent (Subp))) | |
8534 | then | |
8535 | Overridden_Subp := Subp; | |
8536 | return; | |
8537 | end if; | |
8538 | ||
8539 | Hom := Homonym (Hom); | |
8540 | end loop; | |
8541 | ||
4adf3c50 AC |
8542 | -- After examining all candidates for overriding, we are left with |
8543 | -- the best match which is a mode incompatible interface routine. | |
8544 | -- Do not emit an error if the Expander is active since this error | |
8545 | -- will be detected later on after all concurrent types are | |
8546 | -- expanded and all wrappers are built. This check is meant for | |
8547 | -- spec-only compilations. | |
8aa15e3b | 8548 | |
4adf3c50 | 8549 | if Present (Candidate) and then not Expander_Active then |
8aa15e3b JM |
8550 | Iface_Typ := |
8551 | Find_Parameter_Type (Parent (First_Formal (Candidate))); | |
8552 | ||
4adf3c50 AC |
8553 | -- Def_Id is primitive of a protected type, declared inside the |
8554 | -- type, and the candidate is primitive of a limited or | |
8555 | -- synchronized interface. | |
8aa15e3b JM |
8556 | |
8557 | if In_Scope | |
8558 | and then Is_Protected_Type (Typ) | |
8559 | and then | |
8560 | (Is_Limited_Interface (Iface_Typ) | |
c199ccf7 AC |
8561 | or else Is_Protected_Interface (Iface_Typ) |
8562 | or else Is_Synchronized_Interface (Iface_Typ) | |
8563 | or else Is_Task_Interface (Iface_Typ)) | |
8aa15e3b | 8564 | then |
dd54644b | 8565 | Error_Msg_PT (Parent (Typ), Candidate); |
8aa15e3b | 8566 | end if; |
5d37ba92 | 8567 | end if; |
8aa15e3b JM |
8568 | |
8569 | Overridden_Subp := Candidate; | |
8570 | return; | |
8571 | end; | |
5d37ba92 ES |
8572 | end Check_Synchronized_Overriding; |
8573 | ||
8574 | ---------------------------- | |
8575 | -- Is_Private_Declaration -- | |
8576 | ---------------------------- | |
8577 | ||
8578 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
8579 | Priv_Decls : List_Id; | |
8580 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
8581 | ||
8582 | begin | |
8583 | if Is_Package_Or_Generic_Package (Current_Scope) | |
8584 | and then In_Private_Part (Current_Scope) | |
8585 | then | |
8586 | Priv_Decls := | |
a4901c08 AC |
8587 | Private_Declarations |
8588 | (Specification (Unit_Declaration_Node (Current_Scope))); | |
5d37ba92 ES |
8589 | |
8590 | return In_Package_Body (Current_Scope) | |
8591 | or else | |
8592 | (Is_List_Member (Decl) | |
a4901c08 | 8593 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 8594 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
8595 | and then not |
8596 | Is_Compilation_Unit | |
8597 | (Defining_Entity (Parent (Decl))) | |
8598 | and then List_Containing (Parent (Parent (Decl))) = | |
8599 | Priv_Decls); | |
5d37ba92 ES |
8600 | else |
8601 | return False; | |
8602 | end if; | |
8603 | end Is_Private_Declaration; | |
996ae0b0 | 8604 | |
2ddc2000 AC |
8605 | -------------------------- |
8606 | -- Is_Overriding_Alias -- | |
8607 | -------------------------- | |
8608 | ||
8609 | function Is_Overriding_Alias | |
8610 | (Old_E : Entity_Id; | |
8611 | New_E : Entity_Id) return Boolean | |
8612 | is | |
8613 | AO : constant Entity_Id := Alias (Old_E); | |
8614 | AN : constant Entity_Id := Alias (New_E); | |
8615 | ||
8616 | begin | |
8617 | return Scope (AO) /= Scope (AN) | |
8618 | or else No (DTC_Entity (AO)) | |
8619 | or else No (DTC_Entity (AN)) | |
8620 | or else DT_Position (AO) = DT_Position (AN); | |
8621 | end Is_Overriding_Alias; | |
8622 | ||
996ae0b0 RK |
8623 | -- Start of processing for New_Overloaded_Entity |
8624 | ||
8625 | begin | |
fbf5a39b AC |
8626 | -- We need to look for an entity that S may override. This must be a |
8627 | -- homonym in the current scope, so we look for the first homonym of | |
8628 | -- S in the current scope as the starting point for the search. | |
8629 | ||
8630 | E := Current_Entity_In_Scope (S); | |
8631 | ||
947430d5 AC |
8632 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
8633 | -- They are directly added to the list of primitive operations of | |
8634 | -- Derived_Type, unless this is a rederivation in the private part | |
8635 | -- of an operation that was already derived in the visible part of | |
8636 | -- the current package. | |
8637 | ||
0791fbe9 | 8638 | if Ada_Version >= Ada_2005 |
947430d5 AC |
8639 | and then Present (Derived_Type) |
8640 | and then Present (Alias (S)) | |
8641 | and then Is_Dispatching_Operation (Alias (S)) | |
8642 | and then Present (Find_Dispatching_Type (Alias (S))) | |
8643 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
8644 | then | |
8645 | -- For private types, when the full-view is processed we propagate to | |
8646 | -- the full view the non-overridden entities whose attribute "alias" | |
8647 | -- references an interface primitive. These entities were added by | |
8648 | -- Derive_Subprograms to ensure that interface primitives are | |
8649 | -- covered. | |
8650 | ||
8651 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
8652 | -- internal entity that links an interface primitive with its | |
8653 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 8654 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
8655 | |
8656 | if Inside_Freezing_Actions = 0 | |
8657 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
8658 | and then In_Private_Part (Current_Scope) | |
8659 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
8660 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
8661 | and then Full_View (Defining_Identifier (Parent (E))) | |
8662 | = Defining_Identifier (Parent (S)) | |
8663 | and then Alias (E) = Alias (S) | |
8664 | then | |
8665 | Check_Operation_From_Private_View (S, E); | |
8666 | Set_Is_Dispatching_Operation (S); | |
8667 | ||
8668 | -- Common case | |
8669 | ||
8670 | else | |
8671 | Enter_Overloaded_Entity (S); | |
8672 | Check_Dispatching_Operation (S, Empty); | |
8673 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
8674 | end if; | |
8675 | ||
8676 | return; | |
8677 | end if; | |
8678 | ||
fbf5a39b AC |
8679 | -- If there is no homonym then this is definitely not overriding |
8680 | ||
996ae0b0 RK |
8681 | if No (E) then |
8682 | Enter_Overloaded_Entity (S); | |
8683 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 8684 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 8685 | |
ec4867fa ES |
8686 | -- If subprogram has an explicit declaration, check whether it |
8687 | -- has an overriding indicator. | |
758c442c | 8688 | |
ec4867fa | 8689 | if Comes_From_Source (S) then |
8aa15e3b | 8690 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
8691 | |
8692 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
8693 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 8694 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
8695 | -- overriding indicator. |
8696 | ||
8697 | if Ada_Version >= Ada_2012 | |
8698 | and then No (Overridden_Subp) | |
8699 | and then Is_Dispatching_Operation (S) | |
038140ed | 8700 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
8701 | then |
8702 | Overridden_Subp := Overridden_Operation (S); | |
8703 | end if; | |
8704 | ||
5d37ba92 ES |
8705 | Check_Overriding_Indicator |
8706 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
758c442c GD |
8707 | end if; |
8708 | ||
fbf5a39b AC |
8709 | -- If there is a homonym that is not overloadable, then we have an |
8710 | -- error, except for the special cases checked explicitly below. | |
8711 | ||
996ae0b0 RK |
8712 | elsif not Is_Overloadable (E) then |
8713 | ||
8714 | -- Check for spurious conflict produced by a subprogram that has the | |
8715 | -- same name as that of the enclosing generic package. The conflict | |
8716 | -- occurs within an instance, between the subprogram and the renaming | |
8717 | -- declaration for the package. After the subprogram, the package | |
8718 | -- renaming declaration becomes hidden. | |
8719 | ||
8720 | if Ekind (E) = E_Package | |
8721 | and then Present (Renamed_Object (E)) | |
8722 | and then Renamed_Object (E) = Current_Scope | |
8723 | and then Nkind (Parent (Renamed_Object (E))) = | |
8724 | N_Package_Specification | |
8725 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
8726 | then | |
8727 | Set_Is_Hidden (E); | |
8728 | Set_Is_Immediately_Visible (E, False); | |
8729 | Enter_Overloaded_Entity (S); | |
8730 | Set_Homonym (S, Homonym (E)); | |
8731 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 8732 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
8733 | |
8734 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
8735 | -- declaration. However if it is dispatching, it must appear in the |
8736 | -- dispatch table anyway, because it can be dispatched to even if it | |
8737 | -- cannot be called directly. | |
996ae0b0 | 8738 | |
4adf3c50 | 8739 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
8740 | Set_Scope (S, Current_Scope); |
8741 | ||
8742 | if Is_Dispatching_Operation (Alias (S)) then | |
8743 | Check_Dispatching_Operation (S, Empty); | |
8744 | end if; | |
8745 | ||
8746 | return; | |
8747 | ||
8748 | else | |
8749 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 8750 | |
f3d57416 | 8751 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
8752 | |
8753 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
8754 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
8755 | Error_Msg_N ("\& conflicts with declaration#", S); | |
8756 | else | |
8757 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
8758 | end if; |
8759 | ||
8760 | return; | |
8761 | end if; | |
8762 | ||
fbf5a39b AC |
8763 | -- E exists and is overloadable |
8764 | ||
996ae0b0 | 8765 | else |
8aa15e3b | 8766 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 8767 | |
82c80734 RD |
8768 | -- Loop through E and its homonyms to determine if any of them is |
8769 | -- the candidate for overriding by S. | |
996ae0b0 RK |
8770 | |
8771 | while Present (E) loop | |
fbf5a39b AC |
8772 | |
8773 | -- Definitely not interesting if not in the current scope | |
8774 | ||
996ae0b0 RK |
8775 | if Scope (E) /= Current_Scope then |
8776 | null; | |
8777 | ||
25ebc085 AC |
8778 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
8779 | -- null procedures locate the internally generated spec. We | |
8780 | -- enforce mode conformance since a tagged type may inherit | |
8781 | -- from interfaces several null primitives which differ only | |
8782 | -- in the mode of the formals. | |
8783 | ||
8784 | elsif not Comes_From_Source (S) | |
8785 | and then Is_Null_Procedure (S) | |
8786 | and then not Mode_Conformant (E, S) | |
8787 | then | |
8788 | null; | |
8789 | ||
fbf5a39b AC |
8790 | -- Check if we have type conformance |
8791 | ||
ec4867fa | 8792 | elsif Type_Conformant (E, S) then |
c8ef728f | 8793 | |
82c80734 RD |
8794 | -- If the old and new entities have the same profile and one |
8795 | -- is not the body of the other, then this is an error, unless | |
8796 | -- one of them is implicitly declared. | |
996ae0b0 RK |
8797 | |
8798 | -- There are some cases when both can be implicit, for example | |
8799 | -- when both a literal and a function that overrides it are | |
f3d57416 | 8800 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 8801 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 8802 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 8803 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
8804 | -- the former, and the literal is always the former. In the |
8805 | -- odd case where both are derived operations declared at the | |
8806 | -- same point, both operations should be declared, and in that | |
8807 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
8808 | -- part. This can only occur for certain obscure cases in |
8809 | -- instances, when an operation on a type derived from a formal | |
8810 | -- private type does not override a homograph inherited from | |
8811 | -- the actual. In subsequent derivations of such a type, the | |
8812 | -- DT positions of these operations remain distinct, if they | |
8813 | -- have been set. | |
996ae0b0 RK |
8814 | |
8815 | if Present (Alias (S)) | |
8816 | and then (No (Alias (E)) | |
8817 | or else Comes_From_Source (E) | |
2ddc2000 | 8818 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
8819 | or else |
8820 | (Is_Dispatching_Operation (E) | |
2ddc2000 | 8821 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 8822 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 8823 | then |
82c80734 RD |
8824 | -- When an derived operation is overloaded it may be due to |
8825 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
8826 | -- re-inherits. It has to be dealt with. |
8827 | ||
e660dbf7 | 8828 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
8829 | and then In_Private_Part (Current_Scope) |
8830 | then | |
8831 | Check_Operation_From_Private_View (S, E); | |
8832 | end if; | |
8833 | ||
038140ed AC |
8834 | -- In any case the implicit operation remains hidden by the |
8835 | -- existing declaration, which is overriding. Indicate that | |
8836 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 8837 | |
038140ed AC |
8838 | if Present (Alias (S)) then |
8839 | Set_Overridden_Operation (E, Alias (S)); | |
8840 | else | |
8841 | Set_Overridden_Operation (E, S); | |
8842 | end if; | |
758c442c GD |
8843 | |
8844 | if Comes_From_Source (E) then | |
5d37ba92 | 8845 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
758c442c GD |
8846 | end if; |
8847 | ||
996ae0b0 RK |
8848 | return; |
8849 | ||
26a43556 AC |
8850 | -- Within an instance, the renaming declarations for actual |
8851 | -- subprograms may become ambiguous, but they do not hide each | |
8852 | -- other. | |
996ae0b0 RK |
8853 | |
8854 | elsif Ekind (E) /= E_Entry | |
8855 | and then not Comes_From_Source (E) | |
8856 | and then not Is_Generic_Instance (E) | |
8857 | and then (Present (Alias (E)) | |
8858 | or else Is_Intrinsic_Subprogram (E)) | |
8859 | and then (not In_Instance | |
8860 | or else No (Parent (E)) | |
8861 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 8862 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 8863 | then |
26a43556 AC |
8864 | -- A subprogram child unit is not allowed to override an |
8865 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
8866 | |
8867 | if Is_Child_Unit (S) then | |
8868 | Error_Msg_N | |
8869 | ("child unit overrides inherited subprogram in parent", | |
8870 | S); | |
8871 | return; | |
8872 | end if; | |
8873 | ||
8874 | if Is_Non_Overriding_Operation (E, S) then | |
8875 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 8876 | |
c8ef728f | 8877 | if No (Derived_Type) |
996ae0b0 RK |
8878 | or else Is_Tagged_Type (Derived_Type) |
8879 | then | |
8880 | Check_Dispatching_Operation (S, Empty); | |
8881 | end if; | |
8882 | ||
8883 | return; | |
8884 | end if; | |
8885 | ||
8886 | -- E is a derived operation or an internal operator which | |
8887 | -- is being overridden. Remove E from further visibility. | |
8888 | -- Furthermore, if E is a dispatching operation, it must be | |
8889 | -- replaced in the list of primitive operations of its type | |
8890 | -- (see Override_Dispatching_Operation). | |
8891 | ||
ec4867fa | 8892 | Overridden_Subp := E; |
758c442c | 8893 | |
996ae0b0 RK |
8894 | declare |
8895 | Prev : Entity_Id; | |
8896 | ||
8897 | begin | |
8898 | Prev := First_Entity (Current_Scope); | |
996ae0b0 RK |
8899 | while Present (Prev) |
8900 | and then Next_Entity (Prev) /= E | |
8901 | loop | |
8902 | Next_Entity (Prev); | |
8903 | end loop; | |
8904 | ||
8905 | -- It is possible for E to be in the current scope and | |
8906 | -- yet not in the entity chain. This can only occur in a | |
8907 | -- generic context where E is an implicit concatenation | |
8908 | -- in the formal part, because in a generic body the | |
8909 | -- entity chain starts with the formals. | |
8910 | ||
8911 | pragma Assert | |
8912 | (Present (Prev) or else Chars (E) = Name_Op_Concat); | |
8913 | ||
8914 | -- E must be removed both from the entity_list of the | |
8915 | -- current scope, and from the visibility chain | |
8916 | ||
8917 | if Debug_Flag_E then | |
8918 | Write_Str ("Override implicit operation "); | |
8919 | Write_Int (Int (E)); | |
8920 | Write_Eol; | |
8921 | end if; | |
8922 | ||
8923 | -- If E is a predefined concatenation, it stands for four | |
8924 | -- different operations. As a result, a single explicit | |
8925 | -- declaration does not hide it. In a possible ambiguous | |
8926 | -- situation, Disambiguate chooses the user-defined op, | |
8927 | -- so it is correct to retain the previous internal one. | |
8928 | ||
8929 | if Chars (E) /= Name_Op_Concat | |
8930 | or else Ekind (E) /= E_Operator | |
8931 | then | |
8932 | -- For nondispatching derived operations that are | |
8933 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
8934 | -- part of a package, we retain the derived subprogram |
8935 | -- but mark it as not immediately visible. If the | |
8936 | -- derived operation was declared in the visible part | |
8937 | -- then this ensures that it will still be visible | |
8938 | -- outside the package with the proper signature | |
8939 | -- (calls from outside must also be directed to this | |
8940 | -- version rather than the overriding one, unlike the | |
8941 | -- dispatching case). Calls from inside the package | |
8942 | -- will still resolve to the overriding subprogram | |
8943 | -- since the derived one is marked as not visible | |
8944 | -- within the package. | |
996ae0b0 RK |
8945 | |
8946 | -- If the private operation is dispatching, we achieve | |
8947 | -- the overriding by keeping the implicit operation | |
9865d858 | 8948 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
8949 | -- this fashion the proper body is executed in all |
8950 | -- cases, but the original signature is used outside | |
8951 | -- of the package. | |
8952 | ||
8953 | -- If the overriding is not in the private part, we | |
8954 | -- remove the implicit operation altogether. | |
8955 | ||
8956 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
8957 | if not Is_Dispatching_Operation (E) then |
8958 | Set_Is_Immediately_Visible (E, False); | |
8959 | else | |
e895b435 | 8960 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 8961 | -- so nothing else needs to be done here. |
996ae0b0 RK |
8962 | |
8963 | null; | |
8964 | end if; | |
996ae0b0 | 8965 | |
fbf5a39b AC |
8966 | else |
8967 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
8968 | |
8969 | if E = Current_Entity (E) then | |
8970 | Prev_Vis := Empty; | |
8971 | else | |
8972 | Prev_Vis := Current_Entity (E); | |
8973 | while Homonym (Prev_Vis) /= E loop | |
8974 | Prev_Vis := Homonym (Prev_Vis); | |
8975 | end loop; | |
8976 | end if; | |
8977 | ||
8978 | if Prev_Vis /= Empty then | |
8979 | ||
8980 | -- Skip E in the visibility chain | |
8981 | ||
8982 | Set_Homonym (Prev_Vis, Homonym (E)); | |
8983 | ||
8984 | else | |
8985 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
8986 | end if; | |
8987 | ||
8988 | Set_Next_Entity (Prev, Next_Entity (E)); | |
8989 | ||
8990 | if No (Next_Entity (Prev)) then | |
8991 | Set_Last_Entity (Current_Scope, Prev); | |
8992 | end if; | |
996ae0b0 RK |
8993 | end if; |
8994 | end if; | |
8995 | ||
8996 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
8997 | |
8998 | -- For entities generated by Derive_Subprograms the | |
8999 | -- overridden operation is the inherited primitive | |
9000 | -- (which is available through the attribute alias). | |
9001 | ||
9002 | if not (Comes_From_Source (E)) | |
9003 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
9004 | and then Find_Dispatching_Type (E) = |
9005 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
9006 | and then Present (Alias (E)) |
9007 | and then Comes_From_Source (Alias (E)) | |
9008 | then | |
9009 | Set_Overridden_Operation (S, Alias (E)); | |
2fe829ae | 9010 | |
6320f5e1 AC |
9011 | -- Normal case of setting entity as overridden |
9012 | ||
9013 | -- Note: Static_Initialization and Overridden_Operation | |
9014 | -- attributes use the same field in subprogram entities. | |
9015 | -- Static_Initialization is only defined for internal | |
9016 | -- initialization procedures, where Overridden_Operation | |
9017 | -- is irrelevant. Therefore the setting of this attribute | |
9018 | -- must check whether the target is an init_proc. | |
9019 | ||
2fe829ae | 9020 | elsif not Is_Init_Proc (S) then |
1c1289e7 AC |
9021 | Set_Overridden_Operation (S, E); |
9022 | end if; | |
9023 | ||
5d37ba92 | 9024 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 9025 | |
fc53fe76 | 9026 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
9027 | -- expanded to override an inherited null procedure, or a |
9028 | -- predefined dispatching primitive then indicate that E | |
038140ed | 9029 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
9030 | |
9031 | if Comes_From_Source (S) | |
9032 | or else | |
9033 | (Present (Parent (S)) | |
9034 | and then | |
9035 | Nkind (Parent (S)) = N_Procedure_Specification | |
9036 | and then | |
9037 | Null_Present (Parent (S))) | |
38ef8ebe AC |
9038 | or else |
9039 | (Present (Alias (E)) | |
f16e8df9 RD |
9040 | and then |
9041 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 9042 | then |
c8ef728f | 9043 | if Present (Alias (E)) then |
41251c60 | 9044 | Set_Overridden_Operation (S, Alias (E)); |
41251c60 JM |
9045 | end if; |
9046 | end if; | |
9047 | ||
996ae0b0 | 9048 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 9049 | |
82c80734 | 9050 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 9051 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
9052 | |
9053 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
9054 | Check_Dispatching_Operation (S, E); |
9055 | ||
996ae0b0 RK |
9056 | else |
9057 | Check_Dispatching_Operation (S, Empty); | |
9058 | end if; | |
9059 | ||
5d37ba92 ES |
9060 | Check_For_Primitive_Subprogram |
9061 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
9062 | goto Check_Inequality; |
9063 | end; | |
9064 | ||
9065 | -- Apparent redeclarations in instances can occur when two | |
9066 | -- formal types get the same actual type. The subprograms in | |
9067 | -- in the instance are legal, even if not callable from the | |
9068 | -- outside. Calls from within are disambiguated elsewhere. | |
9069 | -- For dispatching operations in the visible part, the usual | |
9070 | -- rules apply, and operations with the same profile are not | |
9071 | -- legal (B830001). | |
9072 | ||
9073 | elsif (In_Instance_Visible_Part | |
9074 | and then not Is_Dispatching_Operation (E)) | |
9075 | or else In_Instance_Not_Visible | |
9076 | then | |
9077 | null; | |
9078 | ||
9079 | -- Here we have a real error (identical profile) | |
9080 | ||
9081 | else | |
9082 | Error_Msg_Sloc := Sloc (E); | |
9083 | ||
9084 | -- Avoid cascaded errors if the entity appears in | |
9085 | -- subsequent calls. | |
9086 | ||
9087 | Set_Scope (S, Current_Scope); | |
9088 | ||
5d37ba92 ES |
9089 | -- Generate error, with extra useful warning for the case |
9090 | -- of a generic instance with no completion. | |
996ae0b0 RK |
9091 | |
9092 | if Is_Generic_Instance (S) | |
9093 | and then not Has_Completion (E) | |
9094 | then | |
9095 | Error_Msg_N | |
5d37ba92 ES |
9096 | ("instantiation cannot provide body for&", S); |
9097 | Error_Msg_N ("\& conflicts with declaration#", S); | |
9098 | else | |
9099 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
9100 | end if; |
9101 | ||
9102 | return; | |
9103 | end if; | |
9104 | ||
9105 | else | |
c8ef728f ES |
9106 | -- If one subprogram has an access parameter and the other |
9107 | -- a parameter of an access type, calls to either might be | |
9108 | -- ambiguous. Verify that parameters match except for the | |
9109 | -- access parameter. | |
9110 | ||
9111 | if May_Hide_Profile then | |
9112 | declare | |
ec4867fa ES |
9113 | F1 : Entity_Id; |
9114 | F2 : Entity_Id; | |
8dbd1460 | 9115 | |
c8ef728f ES |
9116 | begin |
9117 | F1 := First_Formal (S); | |
9118 | F2 := First_Formal (E); | |
9119 | while Present (F1) and then Present (F2) loop | |
9120 | if Is_Access_Type (Etype (F1)) then | |
9121 | if not Is_Access_Type (Etype (F2)) | |
9122 | or else not Conforming_Types | |
9123 | (Designated_Type (Etype (F1)), | |
9124 | Designated_Type (Etype (F2)), | |
9125 | Type_Conformant) | |
9126 | then | |
9127 | May_Hide_Profile := False; | |
9128 | end if; | |
9129 | ||
9130 | elsif | |
9131 | not Conforming_Types | |
9132 | (Etype (F1), Etype (F2), Type_Conformant) | |
9133 | then | |
9134 | May_Hide_Profile := False; | |
9135 | end if; | |
9136 | ||
9137 | Next_Formal (F1); | |
9138 | Next_Formal (F2); | |
9139 | end loop; | |
9140 | ||
9141 | if May_Hide_Profile | |
9142 | and then No (F1) | |
9143 | and then No (F2) | |
9144 | then | |
9145 | Error_Msg_NE ("calls to& may be ambiguous?", S, S); | |
9146 | end if; | |
9147 | end; | |
9148 | end if; | |
996ae0b0 RK |
9149 | end if; |
9150 | ||
996ae0b0 RK |
9151 | E := Homonym (E); |
9152 | end loop; | |
9153 | ||
9154 | -- On exit, we know that S is a new entity | |
9155 | ||
9156 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
9157 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
9158 | Check_Overriding_Indicator | |
9159 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 9160 | |
c4d67e2d | 9161 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 9162 | |
c4d67e2d AC |
9163 | if Nkind (S) /= N_Defining_Operator_Symbol then |
9164 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
9165 | Check_SPARK_Restriction | |
9166 | ("overloading not allowed with entity#", S); | |
9167 | end if; | |
8ed68165 | 9168 | |
82c80734 RD |
9169 | -- If S is a derived operation for an untagged type then by |
9170 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
9171 | -- operation was dispatching), so Check_Dispatching_Operation is not |
9172 | -- called in that case. | |
996ae0b0 | 9173 | |
c8ef728f | 9174 | if No (Derived_Type) |
996ae0b0 RK |
9175 | or else Is_Tagged_Type (Derived_Type) |
9176 | then | |
9177 | Check_Dispatching_Operation (S, Empty); | |
9178 | end if; | |
9179 | end if; | |
9180 | ||
82c80734 RD |
9181 | -- If this is a user-defined equality operator that is not a derived |
9182 | -- subprogram, create the corresponding inequality. If the operation is | |
9183 | -- dispatching, the expansion is done elsewhere, and we do not create | |
9184 | -- an explicit inequality operation. | |
996ae0b0 RK |
9185 | |
9186 | <<Check_Inequality>> | |
9187 | if Chars (S) = Name_Op_Eq | |
9188 | and then Etype (S) = Standard_Boolean | |
9189 | and then Present (Parent (S)) | |
9190 | and then not Is_Dispatching_Operation (S) | |
9191 | then | |
9192 | Make_Inequality_Operator (S); | |
d151d6a3 | 9193 | |
dbe945f1 | 9194 | if Ada_Version >= Ada_2012 then |
e5a58fac AC |
9195 | Check_Untagged_Equality (S); |
9196 | end if; | |
996ae0b0 | 9197 | end if; |
996ae0b0 RK |
9198 | end New_Overloaded_Entity; |
9199 | ||
9200 | --------------------- | |
9201 | -- Process_Formals -- | |
9202 | --------------------- | |
9203 | ||
9204 | procedure Process_Formals | |
07fc65c4 | 9205 | (T : List_Id; |
996ae0b0 RK |
9206 | Related_Nod : Node_Id) |
9207 | is | |
9208 | Param_Spec : Node_Id; | |
9209 | Formal : Entity_Id; | |
9210 | Formal_Type : Entity_Id; | |
9211 | Default : Node_Id; | |
9212 | Ptype : Entity_Id; | |
9213 | ||
800621e0 RD |
9214 | Num_Out_Params : Nat := 0; |
9215 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 9216 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 9217 | |
950d217a AC |
9218 | function Designates_From_With_Type (Typ : Entity_Id) return Boolean; |
9219 | -- Determine whether an access type designates a type coming from a | |
9220 | -- limited view. | |
9221 | ||
07fc65c4 | 9222 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
9223 | -- Check whether the default has a class-wide type. After analysis the |
9224 | -- default has the type of the formal, so we must also check explicitly | |
9225 | -- for an access attribute. | |
07fc65c4 | 9226 | |
950d217a AC |
9227 | ------------------------------- |
9228 | -- Designates_From_With_Type -- | |
9229 | ------------------------------- | |
9230 | ||
9231 | function Designates_From_With_Type (Typ : Entity_Id) return Boolean is | |
9232 | Desig : Entity_Id := Typ; | |
9233 | ||
9234 | begin | |
9235 | if Is_Access_Type (Desig) then | |
9236 | Desig := Directly_Designated_Type (Desig); | |
9237 | end if; | |
9238 | ||
9239 | if Is_Class_Wide_Type (Desig) then | |
9240 | Desig := Root_Type (Desig); | |
9241 | end if; | |
9242 | ||
9243 | return | |
9244 | Ekind (Desig) = E_Incomplete_Type | |
9245 | and then From_With_Type (Desig); | |
9246 | end Designates_From_With_Type; | |
9247 | ||
07fc65c4 GB |
9248 | --------------------------- |
9249 | -- Is_Class_Wide_Default -- | |
9250 | --------------------------- | |
9251 | ||
9252 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
9253 | begin | |
9254 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
9255 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
9256 | and then Attribute_Name (D) = Name_Access |
9257 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
9258 | end Is_Class_Wide_Default; |
9259 | ||
9260 | -- Start of processing for Process_Formals | |
9261 | ||
996ae0b0 RK |
9262 | begin |
9263 | -- In order to prevent premature use of the formals in the same formal | |
9264 | -- part, the Ekind is left undefined until all default expressions are | |
9265 | -- analyzed. The Ekind is established in a separate loop at the end. | |
9266 | ||
9267 | Param_Spec := First (T); | |
996ae0b0 | 9268 | while Present (Param_Spec) loop |
996ae0b0 | 9269 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 9270 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
9271 | Enter_Name (Formal); |
9272 | ||
9273 | -- Case of ordinary parameters | |
9274 | ||
9275 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
9276 | Find_Type (Parameter_Type (Param_Spec)); | |
9277 | Ptype := Parameter_Type (Param_Spec); | |
9278 | ||
9279 | if Ptype = Error then | |
9280 | goto Continue; | |
9281 | end if; | |
9282 | ||
9283 | Formal_Type := Entity (Ptype); | |
9284 | ||
ec4867fa ES |
9285 | if Is_Incomplete_Type (Formal_Type) |
9286 | or else | |
9287 | (Is_Class_Wide_Type (Formal_Type) | |
9288 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) | |
996ae0b0 | 9289 | then |
93bcda23 AC |
9290 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
9291 | -- primitive operations, as long as their completion is | |
9292 | -- in the same declarative part. If in the private part | |
9293 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
9294 | -- Check is done on package exit. For access to subprograms, |
9295 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 9296 | |
d8db0bca | 9297 | if Is_Tagged_Type (Formal_Type) then |
93bcda23 | 9298 | if Ekind (Scope (Current_Scope)) = E_Package |
93bcda23 AC |
9299 | and then not From_With_Type (Formal_Type) |
9300 | and then not Is_Class_Wide_Type (Formal_Type) | |
9301 | then | |
cec29135 ES |
9302 | if not Nkind_In |
9303 | (Parent (T), N_Access_Function_Definition, | |
9304 | N_Access_Procedure_Definition) | |
9305 | then | |
9306 | Append_Elmt | |
9307 | (Current_Scope, | |
9308 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
9309 | |
9310 | -- Freezing is delayed to ensure that Register_Prim | |
9311 | -- will get called for this operation, which is needed | |
9312 | -- in cases where static dispatch tables aren't built. | |
9313 | -- (Note that the same is done for controlling access | |
9314 | -- parameter cases in function Access_Definition.) | |
9315 | ||
9316 | Set_Has_Delayed_Freeze (Current_Scope); | |
cec29135 | 9317 | end if; |
93bcda23 | 9318 | end if; |
fbf5a39b | 9319 | |
0a36105d JM |
9320 | -- Special handling of Value_Type for CIL case |
9321 | ||
9322 | elsif Is_Value_Type (Formal_Type) then | |
9323 | null; | |
9324 | ||
800621e0 RD |
9325 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
9326 | N_Access_Procedure_Definition) | |
996ae0b0 | 9327 | then |
dd386db0 AC |
9328 | -- AI05-0151: Tagged incomplete types are allowed in all |
9329 | -- formal parts. Untagged incomplete types are not allowed | |
9330 | -- in bodies. | |
9331 | ||
9332 | if Ada_Version >= Ada_2012 then | |
9333 | if Is_Tagged_Type (Formal_Type) then | |
9334 | null; | |
9335 | ||
0f1a6a0b AC |
9336 | elsif Nkind_In (Parent (Parent (T)), N_Accept_Statement, |
9337 | N_Entry_Body, | |
9338 | N_Subprogram_Body) | |
dd386db0 AC |
9339 | then |
9340 | Error_Msg_NE | |
9341 | ("invalid use of untagged incomplete type&", | |
0f1a6a0b | 9342 | Ptype, Formal_Type); |
dd386db0 AC |
9343 | end if; |
9344 | ||
9345 | else | |
9346 | Error_Msg_NE | |
9347 | ("invalid use of incomplete type&", | |
0f1a6a0b | 9348 | Param_Spec, Formal_Type); |
dd386db0 AC |
9349 | |
9350 | -- Further checks on the legality of incomplete types | |
9351 | -- in formal parts are delayed until the freeze point | |
9352 | -- of the enclosing subprogram or access to subprogram. | |
9353 | end if; | |
996ae0b0 RK |
9354 | end if; |
9355 | ||
9356 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
9357 | Error_Msg_NE |
9358 | ("premature use of&", | |
9359 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
9360 | end if; |
9361 | ||
fecbd779 AC |
9362 | -- Ada 2012 (AI-142): Handle aliased parameters |
9363 | ||
9364 | if Ada_Version >= Ada_2012 | |
9365 | and then Aliased_Present (Param_Spec) | |
9366 | then | |
9367 | Set_Is_Aliased (Formal); | |
9368 | end if; | |
9369 | ||
0ab80019 | 9370 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 9371 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
9372 | -- formal in the enclosing scope. Finally, replace the parameter |
9373 | -- type of the formal with the internal subtype. | |
7324bf49 | 9374 | |
0791fbe9 | 9375 | if Ada_Version >= Ada_2005 |
41251c60 | 9376 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 9377 | then |
ec4867fa | 9378 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 9379 | Error_Msg_N |
0a36105d JM |
9380 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
9381 | ||
ec4867fa ES |
9382 | else |
9383 | if Can_Never_Be_Null (Formal_Type) | |
9384 | and then Comes_From_Source (Related_Nod) | |
9385 | then | |
ed2233dc | 9386 | Error_Msg_NE |
0a36105d | 9387 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 9388 | Param_Spec, Formal_Type); |
ec4867fa | 9389 | end if; |
41251c60 | 9390 | |
ec4867fa ES |
9391 | Formal_Type := |
9392 | Create_Null_Excluding_Itype | |
9393 | (T => Formal_Type, | |
9394 | Related_Nod => Related_Nod, | |
9395 | Scope_Id => Scope (Current_Scope)); | |
0a36105d JM |
9396 | |
9397 | -- If the designated type of the itype is an itype we | |
9398 | -- decorate it with the Has_Delayed_Freeze attribute to | |
9399 | -- avoid problems with the backend. | |
9400 | ||
9401 | -- Example: | |
9402 | -- type T is access procedure; | |
9403 | -- procedure Op (O : not null T); | |
9404 | ||
9405 | if Is_Itype (Directly_Designated_Type (Formal_Type)) then | |
9406 | Set_Has_Delayed_Freeze (Formal_Type); | |
9407 | end if; | |
ec4867fa | 9408 | end if; |
7324bf49 AC |
9409 | end if; |
9410 | ||
996ae0b0 RK |
9411 | -- An access formal type |
9412 | ||
9413 | else | |
9414 | Formal_Type := | |
9415 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 9416 | |
f937473f RD |
9417 | -- No need to continue if we already notified errors |
9418 | ||
9419 | if not Present (Formal_Type) then | |
9420 | return; | |
9421 | end if; | |
9422 | ||
0ab80019 | 9423 | -- Ada 2005 (AI-254) |
7324bf49 | 9424 | |
af4b9434 AC |
9425 | declare |
9426 | AD : constant Node_Id := | |
9427 | Access_To_Subprogram_Definition | |
9428 | (Parameter_Type (Param_Spec)); | |
9429 | begin | |
9430 | if Present (AD) and then Protected_Present (AD) then | |
9431 | Formal_Type := | |
9432 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 9433 | (Param_Spec); |
af4b9434 AC |
9434 | end if; |
9435 | end; | |
996ae0b0 RK |
9436 | end if; |
9437 | ||
9438 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 9439 | |
fecbd779 AC |
9440 | -- Deal with default expression if present |
9441 | ||
fbf5a39b | 9442 | Default := Expression (Param_Spec); |
996ae0b0 RK |
9443 | |
9444 | if Present (Default) then | |
2ba431e5 | 9445 | Check_SPARK_Restriction |
fe5d3068 | 9446 | ("default expression is not allowed", Default); |
38171f43 | 9447 | |
996ae0b0 | 9448 | if Out_Present (Param_Spec) then |
ed2233dc | 9449 | Error_Msg_N |
996ae0b0 RK |
9450 | ("default initialization only allowed for IN parameters", |
9451 | Param_Spec); | |
9452 | end if; | |
9453 | ||
9454 | -- Do the special preanalysis of the expression (see section on | |
9455 | -- "Handling of Default Expressions" in the spec of package Sem). | |
9456 | ||
21d27997 | 9457 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 9458 | |
f29b857f ES |
9459 | -- An access to constant cannot be the default for |
9460 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
9461 | |
9462 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
9463 | and then not Is_Access_Constant (Formal_Type) | |
9464 | and then Is_Access_Type (Etype (Default)) | |
9465 | and then Is_Access_Constant (Etype (Default)) | |
9466 | then | |
f29b857f ES |
9467 | Error_Msg_N |
9468 | ("formal that is access to variable cannot be initialized " & | |
9469 | "with an access-to-constant expression", Default); | |
2eb160f2 ST |
9470 | end if; |
9471 | ||
d8db0bca JM |
9472 | -- Check that the designated type of an access parameter's default |
9473 | -- is not a class-wide type unless the parameter's designated type | |
9474 | -- is also class-wide. | |
996ae0b0 RK |
9475 | |
9476 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
950d217a | 9477 | and then not Designates_From_With_Type (Formal_Type) |
07fc65c4 | 9478 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
9479 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
9480 | then | |
07fc65c4 GB |
9481 | Error_Msg_N |
9482 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 9483 | end if; |
4755cce9 JM |
9484 | |
9485 | -- Check incorrect use of dynamically tagged expressions | |
9486 | ||
9487 | if Is_Tagged_Type (Formal_Type) then | |
9488 | Check_Dynamically_Tagged_Expression | |
9489 | (Expr => Default, | |
9490 | Typ => Formal_Type, | |
9491 | Related_Nod => Default); | |
9492 | end if; | |
996ae0b0 RK |
9493 | end if; |
9494 | ||
41251c60 JM |
9495 | -- Ada 2005 (AI-231): Static checks |
9496 | ||
0791fbe9 | 9497 | if Ada_Version >= Ada_2005 |
41251c60 JM |
9498 | and then Is_Access_Type (Etype (Formal)) |
9499 | and then Can_Never_Be_Null (Etype (Formal)) | |
9500 | then | |
9501 | Null_Exclusion_Static_Checks (Param_Spec); | |
9502 | end if; | |
9503 | ||
996ae0b0 RK |
9504 | <<Continue>> |
9505 | Next (Param_Spec); | |
9506 | end loop; | |
9507 | ||
82c80734 RD |
9508 | -- If this is the formal part of a function specification, analyze the |
9509 | -- subtype mark in the context where the formals are visible but not | |
9510 | -- yet usable, and may hide outer homographs. | |
9511 | ||
9512 | if Nkind (Related_Nod) = N_Function_Specification then | |
9513 | Analyze_Return_Type (Related_Nod); | |
9514 | end if; | |
9515 | ||
996ae0b0 RK |
9516 | -- Now set the kind (mode) of each formal |
9517 | ||
9518 | Param_Spec := First (T); | |
996ae0b0 RK |
9519 | while Present (Param_Spec) loop |
9520 | Formal := Defining_Identifier (Param_Spec); | |
9521 | Set_Formal_Mode (Formal); | |
9522 | ||
9523 | if Ekind (Formal) = E_In_Parameter then | |
9524 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
9525 | ||
9526 | if Present (Expression (Param_Spec)) then | |
9527 | Default := Expression (Param_Spec); | |
9528 | ||
9529 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
9530 | if Nkind (Parameter_Type (Param_Spec)) /= |
9531 | N_Access_Definition | |
996ae0b0 RK |
9532 | then |
9533 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 9534 | else |
5ebfaacf AC |
9535 | Formal_Type := |
9536 | Access_Definition | |
9537 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
9538 | end if; |
9539 | ||
9540 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
9541 | end if; | |
2820d220 | 9542 | end if; |
800621e0 RD |
9543 | |
9544 | elsif Ekind (Formal) = E_Out_Parameter then | |
9545 | Num_Out_Params := Num_Out_Params + 1; | |
9546 | ||
9547 | if Num_Out_Params = 1 then | |
9548 | First_Out_Param := Formal; | |
9549 | end if; | |
9550 | ||
9551 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
9552 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
9553 | end if; |
9554 | ||
fecbd779 AC |
9555 | -- Force call by reference if aliased |
9556 | ||
9557 | if Is_Aliased (Formal) then | |
9558 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf AC |
9559 | |
9560 | -- Warn if user asked this to be passed by copy | |
9561 | ||
9562 | if Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
9563 | Error_Msg_N | |
9564 | ("?cannot pass aliased parameter & by copy", Formal); | |
9565 | end if; | |
9566 | ||
9567 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy | |
9568 | ||
9569 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
9570 | Set_Mechanism (Formal, By_Copy); | |
9571 | ||
9572 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Reference then | |
9573 | Set_Mechanism (Formal, By_Reference); | |
fecbd779 AC |
9574 | end if; |
9575 | ||
996ae0b0 RK |
9576 | Next (Param_Spec); |
9577 | end loop; | |
800621e0 RD |
9578 | |
9579 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
9580 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
9581 | end if; | |
996ae0b0 RK |
9582 | end Process_Formals; |
9583 | ||
21d27997 RD |
9584 | ------------------ |
9585 | -- Process_PPCs -- | |
9586 | ------------------ | |
9587 | ||
9588 | procedure Process_PPCs | |
9589 | (N : Node_Id; | |
9590 | Spec_Id : Entity_Id; | |
9591 | Body_Id : Entity_Id) | |
9592 | is | |
9593 | Loc : constant Source_Ptr := Sloc (N); | |
9594 | Prag : Node_Id; | |
21d27997 RD |
9595 | Parms : List_Id; |
9596 | ||
e606088a AC |
9597 | Designator : Entity_Id; |
9598 | -- Subprogram designator, set from Spec_Id if present, else Body_Id | |
9599 | ||
beacce02 AC |
9600 | Precond : Node_Id := Empty; |
9601 | -- Set non-Empty if we prepend precondition to the declarations. This | |
9602 | -- is used to hook up inherited preconditions (adding the condition | |
9603 | -- expression with OR ELSE, and adding the message). | |
9604 | ||
9605 | Inherited_Precond : Node_Id; | |
9606 | -- Precondition inherited from parent subprogram | |
9607 | ||
9608 | Inherited : constant Subprogram_List := | |
e606088a AC |
9609 | Inherited_Subprograms (Spec_Id); |
9610 | -- List of subprograms inherited by this subprogram | |
beacce02 AC |
9611 | |
9612 | Plist : List_Id := No_List; | |
9613 | -- List of generated postconditions | |
9614 | ||
f0709ca6 AC |
9615 | function Grab_PPC (Pspec : Entity_Id := Empty) return Node_Id; |
9616 | -- Prag contains an analyzed precondition or postcondition pragma. This | |
9617 | -- function copies the pragma, changes it to the corresponding Check | |
9618 | -- pragma and returns the Check pragma as the result. If Pspec is non- | |
9619 | -- empty, this is the case of inheriting a PPC, where we must change | |
9620 | -- references to parameters of the inherited subprogram to point to the | |
9621 | -- corresponding parameters of the current subprogram. | |
21d27997 | 9622 | |
b4ca2d2c AC |
9623 | function Invariants_Or_Predicates_Present return Boolean; |
9624 | -- Determines if any invariants or predicates are present for any OUT | |
9625 | -- or IN OUT parameters of the subprogram, or (for a function) if the | |
9626 | -- return value has an invariant. | |
e606088a | 9627 | |
a4901c08 AC |
9628 | function Is_Public_Subprogram_For (T : Entity_Id) return Boolean; |
9629 | -- T is the entity for a private type for which invariants are defined. | |
9630 | -- This function returns True if the procedure corresponding to the | |
9631 | -- value of Designator is a public procedure from the point of view of | |
9632 | -- this type (i.e. its spec is in the visible part of the package that | |
9633 | -- contains the declaration of the private type). A True value means | |
9634 | -- that an invariant check is required (for an IN OUT parameter, or | |
9635 | -- the returned value of a function. | |
9636 | ||
21d27997 RD |
9637 | -------------- |
9638 | -- Grab_PPC -- | |
9639 | -------------- | |
9640 | ||
f0709ca6 AC |
9641 | function Grab_PPC (Pspec : Entity_Id := Empty) return Node_Id is |
9642 | Nam : constant Name_Id := Pragma_Name (Prag); | |
9643 | Map : Elist_Id; | |
9644 | CP : Node_Id; | |
21d27997 RD |
9645 | |
9646 | begin | |
f0709ca6 AC |
9647 | -- Prepare map if this is the case where we have to map entities of |
9648 | -- arguments in the overridden subprogram to corresponding entities | |
9649 | -- of the current subprogram. | |
9650 | ||
9651 | if No (Pspec) then | |
9652 | Map := No_Elist; | |
9653 | ||
9654 | else | |
9655 | declare | |
9656 | PF : Entity_Id; | |
9657 | CF : Entity_Id; | |
9658 | ||
9659 | begin | |
9660 | Map := New_Elmt_List; | |
9661 | PF := First_Formal (Pspec); | |
e606088a | 9662 | CF := First_Formal (Designator); |
f0709ca6 AC |
9663 | while Present (PF) loop |
9664 | Append_Elmt (PF, Map); | |
9665 | Append_Elmt (CF, Map); | |
9666 | Next_Formal (PF); | |
9667 | Next_Formal (CF); | |
9668 | end loop; | |
9669 | end; | |
9670 | end if; | |
9671 | ||
308e6f3a | 9672 | -- Now we can copy the tree, doing any required substitutions |
f0709ca6 AC |
9673 | |
9674 | CP := New_Copy_Tree (Prag, Map => Map, New_Scope => Current_Scope); | |
9675 | ||
21d27997 RD |
9676 | -- Set Analyzed to false, since we want to reanalyze the check |
9677 | -- procedure. Note that it is only at the outer level that we | |
9678 | -- do this fiddling, for the spec cases, the already preanalyzed | |
9679 | -- parameters are not affected. | |
766d7add | 9680 | |
1fb00064 AC |
9681 | Set_Analyzed (CP, False); |
9682 | ||
9683 | -- We also make sure Comes_From_Source is False for the copy | |
9684 | ||
9685 | Set_Comes_From_Source (CP, False); | |
9686 | ||
0dabde3a ES |
9687 | -- For a postcondition pragma within a generic, preserve the pragma |
9688 | -- for later expansion. | |
21d27997 | 9689 | |
0dabde3a ES |
9690 | if Nam = Name_Postcondition |
9691 | and then not Expander_Active | |
9692 | then | |
9693 | return CP; | |
9694 | end if; | |
9695 | ||
1fb00064 | 9696 | -- Change copy of pragma into corresponding pragma Check |
21d27997 RD |
9697 | |
9698 | Prepend_To (Pragma_Argument_Associations (CP), | |
9699 | Make_Pragma_Argument_Association (Sloc (Prag), | |
7675ad4f AC |
9700 | Expression => Make_Identifier (Loc, Nam))); |
9701 | Set_Pragma_Identifier (CP, Make_Identifier (Sloc (Prag), Name_Check)); | |
21d27997 | 9702 | |
beacce02 AC |
9703 | -- If this is inherited case and the current message starts with |
9704 | -- "failed p", we change it to "failed inherited p...". | |
f0709ca6 AC |
9705 | |
9706 | if Present (Pspec) then | |
beacce02 AC |
9707 | declare |
9708 | Msg : constant Node_Id := | |
9709 | Last (Pragma_Argument_Associations (CP)); | |
9710 | ||
9711 | begin | |
9712 | if Chars (Msg) = Name_Message then | |
9713 | String_To_Name_Buffer (Strval (Expression (Msg))); | |
9714 | ||
9715 | if Name_Buffer (1 .. 8) = "failed p" then | |
9716 | Insert_Str_In_Name_Buffer ("inherited ", 8); | |
9717 | Set_Strval | |
9718 | (Expression (Last (Pragma_Argument_Associations (CP))), | |
9719 | String_From_Name_Buffer); | |
9720 | end if; | |
9721 | end if; | |
9722 | end; | |
f0709ca6 AC |
9723 | end if; |
9724 | ||
9725 | -- Return the check pragma | |
9726 | ||
21d27997 RD |
9727 | return CP; |
9728 | end Grab_PPC; | |
9729 | ||
b4ca2d2c AC |
9730 | -------------------------------------- |
9731 | -- Invariants_Or_Predicates_Present -- | |
9732 | -------------------------------------- | |
e606088a | 9733 | |
b4ca2d2c AC |
9734 | function Invariants_Or_Predicates_Present return Boolean is |
9735 | Formal : Entity_Id; | |
e606088a AC |
9736 | |
9737 | begin | |
9738 | -- Check function return result | |
9739 | ||
9740 | if Ekind (Designator) /= E_Procedure | |
9741 | and then Has_Invariants (Etype (Designator)) | |
9742 | then | |
9743 | return True; | |
9744 | end if; | |
9745 | ||
9746 | -- Check parameters | |
9747 | ||
9748 | Formal := First_Formal (Designator); | |
9749 | while Present (Formal) loop | |
9750 | if Ekind (Formal) /= E_In_Parameter | |
b4ca2d2c AC |
9751 | and then |
9752 | (Has_Invariants (Etype (Formal)) | |
9753 | or else Present (Predicate_Function (Etype (Formal)))) | |
e606088a AC |
9754 | then |
9755 | return True; | |
9756 | end if; | |
9757 | ||
9758 | Next_Formal (Formal); | |
9759 | end loop; | |
9760 | ||
9761 | return False; | |
b4ca2d2c | 9762 | end Invariants_Or_Predicates_Present; |
e606088a | 9763 | |
a4901c08 AC |
9764 | ------------------------------ |
9765 | -- Is_Public_Subprogram_For -- | |
9766 | ------------------------------ | |
9767 | ||
9768 | -- The type T is a private type, its declaration is therefore in | |
9769 | -- the list of public declarations of some package. The test for a | |
9770 | -- public subprogram is that its declaration is in this same list | |
9771 | -- of declarations for the same package (note that all the public | |
9772 | -- declarations are in one list, and all the private declarations | |
9773 | -- in another, so this deals with the public/private distinction). | |
9774 | ||
9775 | function Is_Public_Subprogram_For (T : Entity_Id) return Boolean is | |
9776 | DD : constant Node_Id := Unit_Declaration_Node (Designator); | |
9777 | -- The subprogram declaration for the subprogram in question | |
9778 | ||
9779 | TL : constant List_Id := | |
9780 | Visible_Declarations | |
9781 | (Specification (Unit_Declaration_Node (Scope (T)))); | |
9782 | -- The list of declarations containing the private declaration of | |
9783 | -- the type. We know it is a private type, so we know its scope is | |
9784 | -- the package in question, and we know it must be in the visible | |
9785 | -- declarations of this package. | |
9786 | ||
9787 | begin | |
9788 | -- If the subprogram declaration is not a list member, it must be | |
9789 | -- an Init_Proc, in which case we want to consider it to be a | |
9790 | -- public subprogram, since we do get initializations to deal with. | |
9791 | ||
9792 | if not Is_List_Member (DD) then | |
9793 | return True; | |
9794 | ||
9795 | -- Otherwise we test whether the subprogram is declared in the | |
9796 | -- visible declarations of the package containing the type. | |
9797 | ||
9798 | else | |
9799 | return TL = List_Containing (DD); | |
9800 | end if; | |
9801 | end Is_Public_Subprogram_For; | |
9802 | ||
21d27997 RD |
9803 | -- Start of processing for Process_PPCs |
9804 | ||
9805 | begin | |
e606088a AC |
9806 | -- Capture designator from spec if present, else from body |
9807 | ||
9808 | if Present (Spec_Id) then | |
9809 | Designator := Spec_Id; | |
9810 | else | |
9811 | Designator := Body_Id; | |
9812 | end if; | |
9813 | ||
21d27997 RD |
9814 | -- Grab preconditions from spec |
9815 | ||
9816 | if Present (Spec_Id) then | |
9817 | ||
9818 | -- Loop through PPC pragmas from spec. Note that preconditions from | |
9819 | -- the body will be analyzed and converted when we scan the body | |
9820 | -- declarations below. | |
9821 | ||
dac3bede | 9822 | Prag := Spec_PPC_List (Contract (Spec_Id)); |
21d27997 | 9823 | while Present (Prag) loop |
1fb00064 AC |
9824 | if Pragma_Name (Prag) = Name_Precondition then |
9825 | ||
beacce02 AC |
9826 | -- For Pre (or Precondition pragma), we simply prepend the |
9827 | -- pragma to the list of declarations right away so that it | |
9828 | -- will be executed at the start of the procedure. Note that | |
9829 | -- this processing reverses the order of the list, which is | |
9830 | -- what we want since new entries were chained to the head of | |
2d395256 AC |
9831 | -- the list. There can be more than one precondition when we |
9832 | -- use pragma Precondition. | |
beacce02 AC |
9833 | |
9834 | if not Class_Present (Prag) then | |
9835 | Prepend (Grab_PPC, Declarations (N)); | |
9836 | ||
9837 | -- For Pre'Class there can only be one pragma, and we save | |
9838 | -- it in Precond for now. We will add inherited Pre'Class | |
9839 | -- stuff before inserting this pragma in the declarations. | |
9840 | else | |
9841 | Precond := Grab_PPC; | |
9842 | end if; | |
21d27997 RD |
9843 | end if; |
9844 | ||
9845 | Prag := Next_Pragma (Prag); | |
9846 | end loop; | |
beacce02 AC |
9847 | |
9848 | -- Now deal with inherited preconditions | |
9849 | ||
9850 | for J in Inherited'Range loop | |
dac3bede | 9851 | Prag := Spec_PPC_List (Contract (Inherited (J))); |
beacce02 AC |
9852 | |
9853 | while Present (Prag) loop | |
9854 | if Pragma_Name (Prag) = Name_Precondition | |
9855 | and then Class_Present (Prag) | |
9856 | then | |
3c971dcc | 9857 | Inherited_Precond := Grab_PPC (Inherited (J)); |
beacce02 AC |
9858 | |
9859 | -- No precondition so far, so establish this as the first | |
9860 | ||
9861 | if No (Precond) then | |
9862 | Precond := Inherited_Precond; | |
9863 | ||
9864 | -- Here we already have a precondition, add inherited one | |
9865 | ||
9866 | else | |
9867 | -- Add new precondition to old one using OR ELSE | |
9868 | ||
9869 | declare | |
9870 | New_Expr : constant Node_Id := | |
9871 | Get_Pragma_Arg | |
9872 | (Next | |
9873 | (First | |
9874 | (Pragma_Argument_Associations | |
9875 | (Inherited_Precond)))); | |
9876 | Old_Expr : constant Node_Id := | |
9877 | Get_Pragma_Arg | |
9878 | (Next | |
9879 | (First | |
9880 | (Pragma_Argument_Associations | |
9881 | (Precond)))); | |
9882 | ||
9883 | begin | |
9884 | if Paren_Count (Old_Expr) = 0 then | |
9885 | Set_Paren_Count (Old_Expr, 1); | |
9886 | end if; | |
9887 | ||
9888 | if Paren_Count (New_Expr) = 0 then | |
9889 | Set_Paren_Count (New_Expr, 1); | |
9890 | end if; | |
9891 | ||
9892 | Rewrite (Old_Expr, | |
9893 | Make_Or_Else (Sloc (Old_Expr), | |
9894 | Left_Opnd => Relocate_Node (Old_Expr), | |
9895 | Right_Opnd => New_Expr)); | |
9896 | end; | |
9897 | ||
9898 | -- Add new message in the form: | |
9899 | ||
9900 | -- failed precondition from bla | |
9901 | -- also failed inherited precondition from bla | |
9902 | -- ... | |
9903 | ||
3c971dcc AC |
9904 | -- Skip this if exception locations are suppressed |
9905 | ||
9906 | if not Exception_Locations_Suppressed then | |
9907 | declare | |
9908 | New_Msg : constant Node_Id := | |
9909 | Get_Pragma_Arg | |
9910 | (Last | |
9911 | (Pragma_Argument_Associations | |
9912 | (Inherited_Precond))); | |
9913 | Old_Msg : constant Node_Id := | |
9914 | Get_Pragma_Arg | |
9915 | (Last | |
9916 | (Pragma_Argument_Associations | |
9917 | (Precond))); | |
9918 | begin | |
9919 | Start_String (Strval (Old_Msg)); | |
9920 | Store_String_Chars (ASCII.LF & " also "); | |
9921 | Store_String_Chars (Strval (New_Msg)); | |
9922 | Set_Strval (Old_Msg, End_String); | |
9923 | end; | |
9924 | end if; | |
beacce02 AC |
9925 | end if; |
9926 | end if; | |
9927 | ||
9928 | Prag := Next_Pragma (Prag); | |
9929 | end loop; | |
9930 | end loop; | |
9931 | ||
9932 | -- If we have built a precondition for Pre'Class (including any | |
9933 | -- Pre'Class aspects inherited from parent subprograms), then we | |
9934 | -- insert this composite precondition at this stage. | |
9935 | ||
9936 | if Present (Precond) then | |
9937 | Prepend (Precond, Declarations (N)); | |
9938 | end if; | |
21d27997 RD |
9939 | end if; |
9940 | ||
9941 | -- Build postconditions procedure if needed and prepend the following | |
9942 | -- declaration to the start of the declarations for the subprogram. | |
9943 | ||
9944 | -- procedure _postconditions [(_Result : resulttype)] is | |
9945 | -- begin | |
9946 | -- pragma Check (Postcondition, condition [,message]); | |
9947 | -- pragma Check (Postcondition, condition [,message]); | |
9948 | -- ... | |
e606088a AC |
9949 | -- Invariant_Procedure (_Result) ... |
9950 | -- Invariant_Procedure (Arg1) | |
9951 | -- ... | |
21d27997 RD |
9952 | -- end; |
9953 | ||
9954 | -- First we deal with the postconditions in the body | |
9955 | ||
9956 | if Is_Non_Empty_List (Declarations (N)) then | |
9957 | ||
9958 | -- Loop through declarations | |
9959 | ||
9960 | Prag := First (Declarations (N)); | |
9961 | while Present (Prag) loop | |
9962 | if Nkind (Prag) = N_Pragma then | |
9963 | ||
9964 | -- If pragma, capture if enabled postcondition, else ignore | |
9965 | ||
9966 | if Pragma_Name (Prag) = Name_Postcondition | |
9967 | and then Check_Enabled (Name_Postcondition) | |
9968 | then | |
9969 | if Plist = No_List then | |
9970 | Plist := Empty_List; | |
9971 | end if; | |
9972 | ||
9973 | Analyze (Prag); | |
0dabde3a | 9974 | |
f0709ca6 AC |
9975 | -- If expansion is disabled, as in a generic unit, save |
9976 | -- pragma for later expansion. | |
0dabde3a ES |
9977 | |
9978 | if not Expander_Active then | |
f0709ca6 | 9979 | Prepend (Grab_PPC, Declarations (N)); |
0dabde3a | 9980 | else |
f0709ca6 | 9981 | Append (Grab_PPC, Plist); |
0dabde3a | 9982 | end if; |
21d27997 RD |
9983 | end if; |
9984 | ||
9985 | Next (Prag); | |
9986 | ||
043ce308 | 9987 | -- Not a pragma, if comes from source, then end scan |
21d27997 RD |
9988 | |
9989 | elsif Comes_From_Source (Prag) then | |
9990 | exit; | |
9991 | ||
043ce308 | 9992 | -- Skip stuff not coming from source |
21d27997 RD |
9993 | |
9994 | else | |
9995 | Next (Prag); | |
9996 | end if; | |
9997 | end loop; | |
9998 | end if; | |
9999 | ||
10000 | -- Now deal with any postconditions from the spec | |
10001 | ||
10002 | if Present (Spec_Id) then | |
e606088a | 10003 | Spec_Postconditions : declare |
f0709ca6 AC |
10004 | procedure Process_Post_Conditions |
10005 | (Spec : Node_Id; | |
10006 | Class : Boolean); | |
10007 | -- This processes the Spec_PPC_List from Spec, processing any | |
10008 | -- postconditions from the list. If Class is True, then only | |
10009 | -- postconditions marked with Class_Present are considered. | |
10010 | -- The caller has checked that Spec_PPC_List is non-Empty. | |
10011 | ||
10012 | ----------------------------- | |
10013 | -- Process_Post_Conditions -- | |
10014 | ----------------------------- | |
10015 | ||
10016 | procedure Process_Post_Conditions | |
10017 | (Spec : Node_Id; | |
10018 | Class : Boolean) | |
10019 | is | |
10020 | Pspec : Node_Id; | |
21d27997 | 10021 | |
f0709ca6 AC |
10022 | begin |
10023 | if Class then | |
10024 | Pspec := Spec; | |
0dabde3a | 10025 | else |
f0709ca6 | 10026 | Pspec := Empty; |
0dabde3a | 10027 | end if; |
f0709ca6 AC |
10028 | |
10029 | -- Loop through PPC pragmas from spec | |
10030 | ||
dac3bede | 10031 | Prag := Spec_PPC_List (Contract (Spec)); |
f0709ca6 AC |
10032 | loop |
10033 | if Pragma_Name (Prag) = Name_Postcondition | |
f0709ca6 AC |
10034 | and then (not Class or else Class_Present (Prag)) |
10035 | then | |
10036 | if Plist = No_List then | |
10037 | Plist := Empty_List; | |
10038 | end if; | |
10039 | ||
10040 | if not Expander_Active then | |
10041 | Prepend | |
10042 | (Grab_PPC (Pspec), Declarations (N)); | |
10043 | else | |
10044 | Append (Grab_PPC (Pspec), Plist); | |
10045 | end if; | |
10046 | end if; | |
10047 | ||
10048 | Prag := Next_Pragma (Prag); | |
10049 | exit when No (Prag); | |
10050 | end loop; | |
10051 | end Process_Post_Conditions; | |
10052 | ||
e606088a AC |
10053 | -- Start of processing for Spec_Postconditions |
10054 | ||
f0709ca6 | 10055 | begin |
dac3bede | 10056 | if Present (Spec_PPC_List (Contract (Spec_Id))) then |
f0709ca6 | 10057 | Process_Post_Conditions (Spec_Id, Class => False); |
21d27997 RD |
10058 | end if; |
10059 | ||
beacce02 | 10060 | -- Process inherited postconditions |
f0709ca6 | 10061 | |
beacce02 | 10062 | for J in Inherited'Range loop |
dac3bede | 10063 | if Present (Spec_PPC_List (Contract (Inherited (J)))) then |
beacce02 | 10064 | Process_Post_Conditions (Inherited (J), Class => True); |
f0709ca6 AC |
10065 | end if; |
10066 | end loop; | |
e606088a | 10067 | end Spec_Postconditions; |
21d27997 RD |
10068 | end if; |
10069 | ||
e606088a AC |
10070 | -- If we had any postconditions and expansion is enabled, or if the |
10071 | -- procedure has invariants, then build the _Postconditions procedure. | |
21d27997 | 10072 | |
b4ca2d2c | 10073 | if (Present (Plist) or else Invariants_Or_Predicates_Present) |
0dabde3a ES |
10074 | and then Expander_Active |
10075 | then | |
e606088a AC |
10076 | if No (Plist) then |
10077 | Plist := Empty_List; | |
10078 | end if; | |
10079 | ||
10080 | -- Special processing for function case | |
10081 | ||
10082 | if Ekind (Designator) /= E_Procedure then | |
10083 | declare | |
10084 | Rent : constant Entity_Id := | |
fecbd779 | 10085 | Make_Defining_Identifier (Loc, Name_uResult); |
e606088a AC |
10086 | Ftyp : constant Entity_Id := Etype (Designator); |
10087 | ||
10088 | begin | |
10089 | Set_Etype (Rent, Ftyp); | |
10090 | ||
10091 | -- Add argument for return | |
10092 | ||
10093 | Parms := | |
10094 | New_List ( | |
10095 | Make_Parameter_Specification (Loc, | |
10096 | Parameter_Type => New_Occurrence_Of (Ftyp, Loc), | |
10097 | Defining_Identifier => Rent)); | |
10098 | ||
a4901c08 AC |
10099 | -- Add invariant call if returning type with invariants and |
10100 | -- this is a public function, i.e. a function declared in the | |
10101 | -- visible part of the package defining the private type. | |
e606088a | 10102 | |
fd0ff1cf RD |
10103 | if Has_Invariants (Etype (Rent)) |
10104 | and then Present (Invariant_Procedure (Etype (Rent))) | |
a4901c08 | 10105 | and then Is_Public_Subprogram_For (Etype (Rent)) |
fd0ff1cf | 10106 | then |
e606088a AC |
10107 | Append_To (Plist, |
10108 | Make_Invariant_Call (New_Occurrence_Of (Rent, Loc))); | |
10109 | end if; | |
10110 | end; | |
10111 | ||
10112 | -- Procedure rather than a function | |
21d27997 | 10113 | |
21d27997 RD |
10114 | else |
10115 | Parms := No_List; | |
10116 | end if; | |
10117 | ||
b4ca2d2c AC |
10118 | -- Add invariant calls and predicate calls for parameters. Note that |
10119 | -- this is done for functions as well, since in Ada 2012 they can | |
10120 | -- have IN OUT args. | |
e606088a AC |
10121 | |
10122 | declare | |
10123 | Formal : Entity_Id; | |
b4ca2d2c | 10124 | Ftype : Entity_Id; |
e606088a AC |
10125 | |
10126 | begin | |
10127 | Formal := First_Formal (Designator); | |
10128 | while Present (Formal) loop | |
b4ca2d2c AC |
10129 | if Ekind (Formal) /= E_In_Parameter then |
10130 | Ftype := Etype (Formal); | |
10131 | ||
10132 | if Has_Invariants (Ftype) | |
10133 | and then Present (Invariant_Procedure (Ftype)) | |
a4901c08 | 10134 | and then Is_Public_Subprogram_For (Ftype) |
b4ca2d2c AC |
10135 | then |
10136 | Append_To (Plist, | |
10137 | Make_Invariant_Call | |
10138 | (New_Occurrence_Of (Formal, Loc))); | |
10139 | end if; | |
10140 | ||
10141 | if Present (Predicate_Function (Ftype)) then | |
10142 | Append_To (Plist, | |
10143 | Make_Predicate_Check | |
10144 | (Ftype, New_Occurrence_Of (Formal, Loc))); | |
10145 | end if; | |
e606088a AC |
10146 | end if; |
10147 | ||
10148 | Next_Formal (Formal); | |
10149 | end loop; | |
10150 | end; | |
10151 | ||
10152 | -- Build and insert postcondition procedure | |
10153 | ||
043ce308 AC |
10154 | declare |
10155 | Post_Proc : constant Entity_Id := | |
e606088a AC |
10156 | Make_Defining_Identifier (Loc, |
10157 | Chars => Name_uPostconditions); | |
043ce308 | 10158 | -- The entity for the _Postconditions procedure |
f0709ca6 | 10159 | |
043ce308 | 10160 | begin |
043ce308 AC |
10161 | Prepend_To (Declarations (N), |
10162 | Make_Subprogram_Body (Loc, | |
10163 | Specification => | |
10164 | Make_Procedure_Specification (Loc, | |
10165 | Defining_Unit_Name => Post_Proc, | |
10166 | Parameter_Specifications => Parms), | |
10167 | ||
10168 | Declarations => Empty_List, | |
10169 | ||
10170 | Handled_Statement_Sequence => | |
10171 | Make_Handled_Sequence_Of_Statements (Loc, | |
10172 | Statements => Plist))); | |
21d27997 | 10173 | |
5ffe0bab | 10174 | Set_Ekind (Post_Proc, E_Procedure); |
5ffe0bab | 10175 | |
3bb3f6d6 AC |
10176 | -- If this is a procedure, set the Postcondition_Proc attribute on |
10177 | -- the proper defining entity for the subprogram. | |
21d27997 | 10178 | |
e606088a AC |
10179 | if Ekind (Designator) = E_Procedure then |
10180 | Set_Postcondition_Proc (Designator, Post_Proc); | |
043ce308 AC |
10181 | end if; |
10182 | end; | |
21d27997 | 10183 | |
e606088a | 10184 | Set_Has_Postconditions (Designator); |
21d27997 RD |
10185 | end if; |
10186 | end Process_PPCs; | |
10187 | ||
fbf5a39b AC |
10188 | ---------------------------- |
10189 | -- Reference_Body_Formals -- | |
10190 | ---------------------------- | |
10191 | ||
10192 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
10193 | Fs : Entity_Id; | |
10194 | Fb : Entity_Id; | |
10195 | ||
10196 | begin | |
10197 | if Error_Posted (Spec) then | |
10198 | return; | |
10199 | end if; | |
10200 | ||
0a36105d JM |
10201 | -- Iterate over both lists. They may be of different lengths if the two |
10202 | -- specs are not conformant. | |
10203 | ||
fbf5a39b AC |
10204 | Fs := First_Formal (Spec); |
10205 | Fb := First_Formal (Bod); | |
0a36105d | 10206 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
10207 | Generate_Reference (Fs, Fb, 'b'); |
10208 | ||
10209 | if Style_Check then | |
10210 | Style.Check_Identifier (Fb, Fs); | |
10211 | end if; | |
10212 | ||
10213 | Set_Spec_Entity (Fb, Fs); | |
10214 | Set_Referenced (Fs, False); | |
10215 | Next_Formal (Fs); | |
10216 | Next_Formal (Fb); | |
10217 | end loop; | |
10218 | end Reference_Body_Formals; | |
10219 | ||
996ae0b0 RK |
10220 | ------------------------- |
10221 | -- Set_Actual_Subtypes -- | |
10222 | ------------------------- | |
10223 | ||
10224 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
2820d220 AC |
10225 | Decl : Node_Id; |
10226 | Formal : Entity_Id; | |
10227 | T : Entity_Id; | |
10228 | First_Stmt : Node_Id := Empty; | |
10229 | AS_Needed : Boolean; | |
996ae0b0 RK |
10230 | |
10231 | begin | |
f3d57416 | 10232 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
10233 | -- actual subtypes (small optimization). |
10234 | ||
10235 | if Ekind (Subp) = E_Procedure | |
10236 | and then Is_Null_Init_Proc (Subp) | |
10237 | then | |
10238 | return; | |
10239 | end if; | |
10240 | ||
996ae0b0 RK |
10241 | Formal := First_Formal (Subp); |
10242 | while Present (Formal) loop | |
10243 | T := Etype (Formal); | |
10244 | ||
e895b435 | 10245 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
10246 | |
10247 | if Is_Constrained (T) then | |
10248 | AS_Needed := False; | |
10249 | ||
82c80734 RD |
10250 | -- If we have unknown discriminants, then we do not need an actual |
10251 | -- subtype, or more accurately we cannot figure it out! Note that | |
10252 | -- all class-wide types have unknown discriminants. | |
996ae0b0 RK |
10253 | |
10254 | elsif Has_Unknown_Discriminants (T) then | |
10255 | AS_Needed := False; | |
10256 | ||
82c80734 RD |
10257 | -- At this stage we have an unconstrained type that may need an |
10258 | -- actual subtype. For sure the actual subtype is needed if we have | |
10259 | -- an unconstrained array type. | |
996ae0b0 RK |
10260 | |
10261 | elsif Is_Array_Type (T) then | |
10262 | AS_Needed := True; | |
10263 | ||
d8db0bca JM |
10264 | -- The only other case needing an actual subtype is an unconstrained |
10265 | -- record type which is an IN parameter (we cannot generate actual | |
10266 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
10267 | -- change the discriminant values. However we exclude the case of | |
10268 | -- initialization procedures, since discriminants are handled very | |
10269 | -- specially in this context, see the section entitled "Handling of | |
10270 | -- Discriminants" in Einfo. | |
10271 | ||
10272 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
10273 | -- in front end layout mode for size/offset values), since in such | |
10274 | -- functions only discriminants are referenced, and not only are such | |
10275 | -- subtypes not needed, but they cannot always be generated, because | |
10276 | -- of order of elaboration issues. | |
996ae0b0 RK |
10277 | |
10278 | elsif Is_Record_Type (T) | |
10279 | and then Ekind (Formal) = E_In_Parameter | |
10280 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 10281 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
10282 | and then not Is_Discrim_SO_Function (Subp) |
10283 | then | |
10284 | AS_Needed := True; | |
10285 | ||
10286 | -- All other cases do not need an actual subtype | |
10287 | ||
10288 | else | |
10289 | AS_Needed := False; | |
10290 | end if; | |
10291 | ||
10292 | -- Generate actual subtypes for unconstrained arrays and | |
10293 | -- unconstrained discriminated records. | |
10294 | ||
10295 | if AS_Needed then | |
7324bf49 | 10296 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 10297 | |
57a8057a | 10298 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
10299 | -- variable that renames the corresponding entry of the |
10300 | -- parameter block, and it is this local variable that may | |
da94696d | 10301 | -- require an actual subtype. |
fbf5a39b | 10302 | |
da94696d | 10303 | if Full_Expander_Active then |
fbf5a39b AC |
10304 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
10305 | else | |
10306 | Decl := Build_Actual_Subtype (T, Formal); | |
10307 | end if; | |
10308 | ||
996ae0b0 RK |
10309 | if Present (Handled_Statement_Sequence (N)) then |
10310 | First_Stmt := | |
10311 | First (Statements (Handled_Statement_Sequence (N))); | |
10312 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
10313 | Mark_Rewrite_Insertion (Decl); | |
10314 | else | |
82c80734 RD |
10315 | -- If the accept statement has no body, there will be no |
10316 | -- reference to the actuals, so no need to compute actual | |
10317 | -- subtypes. | |
996ae0b0 RK |
10318 | |
10319 | return; | |
10320 | end if; | |
10321 | ||
10322 | else | |
fbf5a39b | 10323 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
10324 | Prepend (Decl, Declarations (N)); |
10325 | Mark_Rewrite_Insertion (Decl); | |
10326 | end if; | |
10327 | ||
82c80734 RD |
10328 | -- The declaration uses the bounds of an existing object, and |
10329 | -- therefore needs no constraint checks. | |
2820d220 | 10330 | |
7324bf49 | 10331 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 10332 | |
996ae0b0 RK |
10333 | -- We need to freeze manually the generated type when it is |
10334 | -- inserted anywhere else than in a declarative part. | |
10335 | ||
10336 | if Present (First_Stmt) then | |
10337 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 10338 | Freeze_Entity (Defining_Identifier (Decl), N)); |
996ae0b0 RK |
10339 | end if; |
10340 | ||
fbf5a39b | 10341 | if Nkind (N) = N_Accept_Statement |
da94696d | 10342 | and then Full_Expander_Active |
fbf5a39b AC |
10343 | then |
10344 | Set_Actual_Subtype (Renamed_Object (Formal), | |
10345 | Defining_Identifier (Decl)); | |
10346 | else | |
10347 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
10348 | end if; | |
996ae0b0 RK |
10349 | end if; |
10350 | ||
10351 | Next_Formal (Formal); | |
10352 | end loop; | |
10353 | end Set_Actual_Subtypes; | |
10354 | ||
10355 | --------------------- | |
10356 | -- Set_Formal_Mode -- | |
10357 | --------------------- | |
10358 | ||
10359 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
10360 | Spec : constant Node_Id := Parent (Formal_Id); | |
10361 | ||
10362 | begin | |
10363 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
10364 | -- since we ensure that corresponding actuals are always valid at the | |
10365 | -- point of the call. | |
10366 | ||
10367 | if Out_Present (Spec) then | |
996ae0b0 RK |
10368 | if Ekind (Scope (Formal_Id)) = E_Function |
10369 | or else Ekind (Scope (Formal_Id)) = E_Generic_Function | |
10370 | then | |
b4ca2d2c | 10371 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
10372 | |
10373 | if Ada_Version >= Ada_2012 then | |
10374 | if In_Present (Spec) then | |
10375 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10376 | else | |
10377 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
10378 | end if; | |
10379 | ||
b4ca2d2c AC |
10380 | -- But not in earlier versions of Ada |
10381 | ||
c56a9ba4 AC |
10382 | else |
10383 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
10384 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10385 | end if; | |
996ae0b0 RK |
10386 | |
10387 | elsif In_Present (Spec) then | |
10388 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
10389 | ||
10390 | else | |
fbf5a39b AC |
10391 | Set_Ekind (Formal_Id, E_Out_Parameter); |
10392 | Set_Never_Set_In_Source (Formal_Id, True); | |
10393 | Set_Is_True_Constant (Formal_Id, False); | |
10394 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
10395 | end if; |
10396 | ||
10397 | else | |
10398 | Set_Ekind (Formal_Id, E_In_Parameter); | |
10399 | end if; | |
10400 | ||
fbf5a39b | 10401 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
10402 | -- guarantees that access parameters are always non-null. We also set |
10403 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
10404 | |
10405 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 10406 | |
885c4871 | 10407 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 10408 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 10409 | |
0791fbe9 | 10410 | if Ada_Version < Ada_2005 |
2813bb6b | 10411 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
10412 | then |
10413 | Set_Is_Known_Non_Null (Formal_Id); | |
10414 | Set_Can_Never_Be_Null (Formal_Id); | |
10415 | end if; | |
2813bb6b | 10416 | |
41251c60 JM |
10417 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
10418 | ||
2813bb6b ES |
10419 | elsif Is_Access_Type (Etype (Formal_Id)) |
10420 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
10421 | then | |
2813bb6b | 10422 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
10423 | |
10424 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
10425 | -- access checks) for the case of an IN parameter, which cannot | |
10426 | -- be changed, or for an IN OUT parameter, which can be changed but | |
10427 | -- not to a null value. But for an OUT parameter, the initial value | |
10428 | -- passed in can be null, so we can't set this flag in that case. | |
10429 | ||
10430 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
10431 | Set_Can_Never_Be_Null (Formal_Id); | |
10432 | end if; | |
fbf5a39b AC |
10433 | end if; |
10434 | ||
996ae0b0 RK |
10435 | Set_Mechanism (Formal_Id, Default_Mechanism); |
10436 | Set_Formal_Validity (Formal_Id); | |
10437 | end Set_Formal_Mode; | |
10438 | ||
10439 | ------------------------- | |
10440 | -- Set_Formal_Validity -- | |
10441 | ------------------------- | |
10442 | ||
10443 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
10444 | begin | |
82c80734 RD |
10445 | -- If no validity checking, then we cannot assume anything about the |
10446 | -- validity of parameters, since we do not know there is any checking | |
10447 | -- of the validity on the call side. | |
996ae0b0 RK |
10448 | |
10449 | if not Validity_Checks_On then | |
10450 | return; | |
10451 | ||
fbf5a39b AC |
10452 | -- If validity checking for parameters is enabled, this means we are |
10453 | -- not supposed to make any assumptions about argument values. | |
10454 | ||
10455 | elsif Validity_Check_Parameters then | |
10456 | return; | |
10457 | ||
10458 | -- If we are checking in parameters, we will assume that the caller is | |
10459 | -- also checking parameters, so we can assume the parameter is valid. | |
10460 | ||
996ae0b0 RK |
10461 | elsif Ekind (Formal_Id) = E_In_Parameter |
10462 | and then Validity_Check_In_Params | |
10463 | then | |
10464 | Set_Is_Known_Valid (Formal_Id, True); | |
10465 | ||
fbf5a39b AC |
10466 | -- Similar treatment for IN OUT parameters |
10467 | ||
996ae0b0 RK |
10468 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
10469 | and then Validity_Check_In_Out_Params | |
10470 | then | |
10471 | Set_Is_Known_Valid (Formal_Id, True); | |
10472 | end if; | |
10473 | end Set_Formal_Validity; | |
10474 | ||
10475 | ------------------------ | |
10476 | -- Subtype_Conformant -- | |
10477 | ------------------------ | |
10478 | ||
ce2b6ba5 JM |
10479 | function Subtype_Conformant |
10480 | (New_Id : Entity_Id; | |
10481 | Old_Id : Entity_Id; | |
10482 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10483 | is | |
996ae0b0 | 10484 | Result : Boolean; |
996ae0b0 | 10485 | begin |
ce2b6ba5 JM |
10486 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
10487 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10488 | return Result; |
10489 | end Subtype_Conformant; | |
10490 | ||
10491 | --------------------- | |
10492 | -- Type_Conformant -- | |
10493 | --------------------- | |
10494 | ||
41251c60 JM |
10495 | function Type_Conformant |
10496 | (New_Id : Entity_Id; | |
10497 | Old_Id : Entity_Id; | |
10498 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
10499 | is | |
996ae0b0 | 10500 | Result : Boolean; |
996ae0b0 | 10501 | begin |
c8ef728f ES |
10502 | May_Hide_Profile := False; |
10503 | ||
41251c60 JM |
10504 | Check_Conformance |
10505 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
10506 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
10507 | return Result; |
10508 | end Type_Conformant; | |
10509 | ||
10510 | ------------------------------- | |
10511 | -- Valid_Operator_Definition -- | |
10512 | ------------------------------- | |
10513 | ||
10514 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
10515 | N : Integer := 0; | |
10516 | F : Entity_Id; | |
10517 | Id : constant Name_Id := Chars (Designator); | |
10518 | N_OK : Boolean; | |
10519 | ||
10520 | begin | |
10521 | F := First_Formal (Designator); | |
996ae0b0 RK |
10522 | while Present (F) loop |
10523 | N := N + 1; | |
10524 | ||
10525 | if Present (Default_Value (F)) then | |
ed2233dc | 10526 | Error_Msg_N |
996ae0b0 RK |
10527 | ("default values not allowed for operator parameters", |
10528 | Parent (F)); | |
10529 | end if; | |
10530 | ||
10531 | Next_Formal (F); | |
10532 | end loop; | |
10533 | ||
10534 | -- Verify that user-defined operators have proper number of arguments | |
10535 | -- First case of operators which can only be unary | |
10536 | ||
10537 | if Id = Name_Op_Not | |
10538 | or else Id = Name_Op_Abs | |
10539 | then | |
10540 | N_OK := (N = 1); | |
10541 | ||
10542 | -- Case of operators which can be unary or binary | |
10543 | ||
10544 | elsif Id = Name_Op_Add | |
10545 | or Id = Name_Op_Subtract | |
10546 | then | |
10547 | N_OK := (N in 1 .. 2); | |
10548 | ||
10549 | -- All other operators can only be binary | |
10550 | ||
10551 | else | |
10552 | N_OK := (N = 2); | |
10553 | end if; | |
10554 | ||
10555 | if not N_OK then | |
10556 | Error_Msg_N | |
10557 | ("incorrect number of arguments for operator", Designator); | |
10558 | end if; | |
10559 | ||
10560 | if Id = Name_Op_Ne | |
10561 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
10562 | and then not Is_Intrinsic_Subprogram (Designator) | |
10563 | then | |
10564 | Error_Msg_N | |
10565 | ("explicit definition of inequality not allowed", Designator); | |
10566 | end if; | |
10567 | end Valid_Operator_Definition; | |
10568 | ||
10569 | end Sem_Ch6; |