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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 | -- -- |
b3aa0ca8 | 9 | -- Copyright (C) 1992-2012, 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 | ||
84f4072a JM |
135 | procedure Check_And_Build_Body_To_Inline |
136 | (N : Node_Id; | |
137 | Spec_Id : Entity_Id; | |
138 | Body_Id : Entity_Id); | |
139 | -- Spec_Id and Body_Id are the entities of the specification and body of | |
140 | -- the subprogram body N. If N can be inlined by the frontend (supported | |
141 | -- cases documented in Check_Body_To_Inline) then build the body-to-inline | |
142 | -- associated with N and attach it to the declaration node of Spec_Id. | |
143 | ||
996ae0b0 | 144 | procedure Check_Conformance |
41251c60 JM |
145 | (New_Id : Entity_Id; |
146 | Old_Id : Entity_Id; | |
147 | Ctype : Conformance_Type; | |
148 | Errmsg : Boolean; | |
149 | Conforms : out Boolean; | |
150 | Err_Loc : Node_Id := Empty; | |
151 | Get_Inst : Boolean := False; | |
152 | Skip_Controlling_Formals : Boolean := False); | |
996ae0b0 RK |
153 | -- Given two entities, this procedure checks that the profiles associated |
154 | -- with these entities meet the conformance criterion given by the third | |
155 | -- parameter. If they conform, Conforms is set True and control returns | |
156 | -- to the caller. If they do not conform, Conforms is set to False, and | |
157 | -- in addition, if Errmsg is True on the call, proper messages are output | |
158 | -- to complain about the conformance failure. If Err_Loc is non_Empty | |
159 | -- the error messages are placed on Err_Loc, if Err_Loc is empty, then | |
160 | -- error messages are placed on the appropriate part of the construct | |
161 | -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance | |
162 | -- against a formal access-to-subprogram type so Get_Instance_Of must | |
163 | -- be called. | |
164 | ||
165 | procedure Check_Subprogram_Order (N : Node_Id); | |
166 | -- N is the N_Subprogram_Body node for a subprogram. This routine applies | |
167 | -- the alpha ordering rule for N if this ordering requirement applicable. | |
168 | ||
996ae0b0 RK |
169 | procedure Check_Returns |
170 | (HSS : Node_Id; | |
171 | Mode : Character; | |
c8ef728f ES |
172 | Err : out Boolean; |
173 | Proc : Entity_Id := Empty); | |
174 | -- Called to check for missing return statements in a function body, or for | |
0a36105d | 175 | -- returns present in a procedure body which has No_Return set. HSS is the |
c8ef728f ES |
176 | -- handled statement sequence for the subprogram body. This procedure |
177 | -- checks all flow paths to make sure they either have return (Mode = 'F', | |
178 | -- used for functions) or do not have a return (Mode = 'P', used for | |
179 | -- No_Return procedures). The flag Err is set if there are any control | |
180 | -- paths not explicitly terminated by a return in the function case, and is | |
181 | -- True otherwise. Proc is the entity for the procedure case and is used | |
182 | -- in posting the warning message. | |
996ae0b0 | 183 | |
e5a58fac AC |
184 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
185 | -- In Ada 2012, a primitive equality operator on an untagged record type | |
186 | -- must appear before the type is frozen, and have the same visibility as | |
187 | -- that of the type. This procedure checks that this rule is met, and | |
188 | -- otherwise emits an error on the subprogram declaration and a warning | |
189 | -- on the earlier freeze point if it is easy to locate. | |
190 | ||
996ae0b0 | 191 | procedure Enter_Overloaded_Entity (S : Entity_Id); |
82c80734 RD |
192 | -- This procedure makes S, a new overloaded entity, into the first visible |
193 | -- entity with that name. | |
996ae0b0 | 194 | |
a5b62485 AC |
195 | function Is_Non_Overriding_Operation |
196 | (Prev_E : Entity_Id; | |
197 | New_E : Entity_Id) return Boolean; | |
198 | -- Enforce the rule given in 12.3(18): a private operation in an instance | |
199 | -- overrides an inherited operation only if the corresponding operation | |
260359e3 AC |
200 | -- was overriding in the generic. This needs to be checked for primitive |
201 | -- operations of types derived (in the generic unit) from formal private | |
202 | -- or formal derived types. | |
a5b62485 | 203 | |
996ae0b0 RK |
204 | procedure Make_Inequality_Operator (S : Entity_Id); |
205 | -- Create the declaration for an inequality operator that is implicitly | |
206 | -- created by a user-defined equality operator that yields a boolean. | |
207 | ||
208 | procedure May_Need_Actuals (Fun : Entity_Id); | |
209 | -- Flag functions that can be called without parameters, i.e. those that | |
210 | -- have no parameters, or those for which defaults exist for all parameters | |
211 | ||
21d27997 RD |
212 | procedure Process_PPCs |
213 | (N : Node_Id; | |
214 | Spec_Id : Entity_Id; | |
215 | Body_Id : Entity_Id); | |
3764bb00 BD |
216 | -- Called from Analyze[_Generic]_Subprogram_Body to deal with scanning post |
217 | -- conditions for the body and assembling and inserting the _postconditions | |
218 | -- procedure. N is the node for the subprogram body and Body_Id/Spec_Id are | |
219 | -- the entities for the body and separate spec (if there is no separate | |
b4ca2d2c AC |
220 | -- spec, Spec_Id is Empty). Note that invariants and predicates may also |
221 | -- provide postconditions, and are also handled in this procedure. | |
21d27997 | 222 | |
996ae0b0 RK |
223 | procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
224 | -- Formal_Id is an formal parameter entity. This procedure deals with | |
e358346d AC |
225 | -- setting the proper validity status for this entity, which depends on |
226 | -- the kind of parameter and the validity checking mode. | |
996ae0b0 RK |
227 | |
228 | --------------------------------------------- | |
229 | -- Analyze_Abstract_Subprogram_Declaration -- | |
230 | --------------------------------------------- | |
231 | ||
232 | procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is | |
fbf5a39b AC |
233 | Designator : constant Entity_Id := |
234 | Analyze_Subprogram_Specification (Specification (N)); | |
996ae0b0 RK |
235 | Scop : constant Entity_Id := Current_Scope; |
236 | ||
237 | begin | |
2ba431e5 | 238 | Check_SPARK_Restriction ("abstract subprogram is not allowed", N); |
38171f43 | 239 | |
996ae0b0 | 240 | Generate_Definition (Designator); |
dac3bede | 241 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
f937473f | 242 | Set_Is_Abstract_Subprogram (Designator); |
996ae0b0 RK |
243 | New_Overloaded_Entity (Designator); |
244 | Check_Delayed_Subprogram (Designator); | |
245 | ||
fbf5a39b | 246 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 RK |
247 | |
248 | if Ekind (Scope (Designator)) = E_Protected_Type then | |
249 | Error_Msg_N | |
250 | ("abstract subprogram not allowed in protected type", N); | |
5d37ba92 ES |
251 | |
252 | -- Issue a warning if the abstract subprogram is neither a dispatching | |
253 | -- operation nor an operation that overrides an inherited subprogram or | |
254 | -- predefined operator, since this most likely indicates a mistake. | |
255 | ||
256 | elsif Warn_On_Redundant_Constructs | |
257 | and then not Is_Dispatching_Operation (Designator) | |
038140ed | 258 | and then not Present (Overridden_Operation (Designator)) |
5d37ba92 ES |
259 | and then (not Is_Operator_Symbol_Name (Chars (Designator)) |
260 | or else Scop /= Scope (Etype (First_Formal (Designator)))) | |
261 | then | |
262 | Error_Msg_N | |
263 | ("?abstract subprogram is not dispatching or overriding", N); | |
996ae0b0 | 264 | end if; |
fbf5a39b AC |
265 | |
266 | Generate_Reference_To_Formals (Designator); | |
361effb1 | 267 | Check_Eliminated (Designator); |
eaba57fb RD |
268 | |
269 | if Has_Aspects (N) then | |
270 | Analyze_Aspect_Specifications (N, Designator); | |
271 | end if; | |
996ae0b0 RK |
272 | end Analyze_Abstract_Subprogram_Declaration; |
273 | ||
b0186f71 AC |
274 | --------------------------------- |
275 | -- Analyze_Expression_Function -- | |
276 | --------------------------------- | |
277 | ||
278 | procedure Analyze_Expression_Function (N : Node_Id) is | |
279 | Loc : constant Source_Ptr := Sloc (N); | |
280 | LocX : constant Source_Ptr := Sloc (Expression (N)); | |
0b5b2bbc | 281 | Expr : constant Node_Id := Expression (N); |
d2d4b355 AC |
282 | Spec : constant Node_Id := Specification (N); |
283 | ||
8a06151a | 284 | Def_Id : Entity_Id; |
b0186f71 | 285 | |
8a06151a | 286 | Prev : Entity_Id; |
b0186f71 | 287 | -- If the expression is a completion, Prev is the entity whose |
d2d4b355 AC |
288 | -- declaration is completed. Def_Id is needed to analyze the spec. |
289 | ||
290 | New_Body : Node_Id; | |
291 | New_Decl : Node_Id; | |
292 | New_Spec : Node_Id; | |
b913199e | 293 | Ret : Node_Id; |
b0186f71 AC |
294 | |
295 | begin | |
296 | -- This is one of the occasions on which we transform the tree during | |
afc8324d | 297 | -- semantic analysis. If this is a completion, transform the expression |
d2b10647 ES |
298 | -- function into an equivalent subprogram body, and analyze it. |
299 | ||
300 | -- Expression functions are inlined unconditionally. The back-end will | |
301 | -- determine whether this is possible. | |
302 | ||
303 | Inline_Processing_Required := True; | |
b727a82b AC |
304 | |
305 | -- Create a specification for the generated body. Types and defauts in | |
306 | -- the profile are copies of the spec, but new entities must be created | |
307 | -- for the unit name and the formals. | |
308 | ||
309 | New_Spec := New_Copy_Tree (Spec); | |
310 | Set_Defining_Unit_Name (New_Spec, | |
311 | Make_Defining_Identifier (Sloc (Defining_Unit_Name (Spec)), | |
312 | Chars (Defining_Unit_Name (Spec)))); | |
313 | ||
314 | if Present (Parameter_Specifications (New_Spec)) then | |
315 | declare | |
316 | Formal_Spec : Node_Id; | |
317 | begin | |
318 | Formal_Spec := First (Parameter_Specifications (New_Spec)); | |
319 | while Present (Formal_Spec) loop | |
320 | Set_Defining_Identifier | |
321 | (Formal_Spec, | |
322 | Make_Defining_Identifier (Sloc (Formal_Spec), | |
323 | Chars => Chars (Defining_Identifier (Formal_Spec)))); | |
324 | Next (Formal_Spec); | |
325 | end loop; | |
326 | end; | |
327 | end if; | |
328 | ||
d2d4b355 AC |
329 | Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); |
330 | ||
331 | -- If there are previous overloadable entities with the same name, | |
332 | -- check whether any of them is completed by the expression function. | |
333 | ||
8a06151a | 334 | if Present (Prev) and then Is_Overloadable (Prev) then |
d2d4b355 AC |
335 | Def_Id := Analyze_Subprogram_Specification (Spec); |
336 | Prev := Find_Corresponding_Spec (N); | |
337 | end if; | |
b0186f71 | 338 | |
b913199e AC |
339 | Ret := Make_Simple_Return_Statement (LocX, Expression (N)); |
340 | ||
b0186f71 AC |
341 | New_Body := |
342 | Make_Subprogram_Body (Loc, | |
d2d4b355 | 343 | Specification => New_Spec, |
b0186f71 AC |
344 | Declarations => Empty_List, |
345 | Handled_Statement_Sequence => | |
346 | Make_Handled_Sequence_Of_Statements (LocX, | |
b913199e | 347 | Statements => New_List (Ret))); |
b0186f71 | 348 | |
6d7e5c54 AC |
349 | if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
350 | ||
b0186f71 AC |
351 | -- If the expression completes a generic subprogram, we must create a |
352 | -- separate node for the body, because at instantiation the original | |
353 | -- node of the generic copy must be a generic subprogram body, and | |
354 | -- cannot be a expression function. Otherwise we just rewrite the | |
355 | -- expression with the non-generic body. | |
356 | ||
357 | Insert_After (N, New_Body); | |
358 | Rewrite (N, Make_Null_Statement (Loc)); | |
d2d4b355 | 359 | Set_Has_Completion (Prev, False); |
b0186f71 AC |
360 | Analyze (N); |
361 | Analyze (New_Body); | |
d2b10647 | 362 | Set_Is_Inlined (Prev); |
b0186f71 | 363 | |
6d7e5c54 AC |
364 | elsif Present (Prev) |
365 | and then Comes_From_Source (Prev) | |
366 | then | |
d2d4b355 | 367 | Set_Has_Completion (Prev, False); |
76264f60 AC |
368 | |
369 | -- For navigation purposes, indicate that the function is a body | |
370 | ||
371 | Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); | |
b0186f71 | 372 | Rewrite (N, New_Body); |
d2b10647 ES |
373 | Analyze (N); |
374 | ||
6d7e5c54 AC |
375 | -- Prev is the previous entity with the same name, but it is can |
376 | -- be an unrelated spec that is not completed by the expression | |
377 | -- function. In that case the relevant entity is the one in the body. | |
378 | -- Not clear that the backend can inline it in this case ??? | |
379 | ||
380 | if Has_Completion (Prev) then | |
381 | Set_Is_Inlined (Prev); | |
31af8899 AC |
382 | |
383 | -- The formals of the expression function are body formals, | |
384 | -- and do not appear in the ali file, which will only contain | |
385 | -- references to the formals of the original subprogram spec. | |
386 | ||
387 | declare | |
388 | F1 : Entity_Id; | |
389 | F2 : Entity_Id; | |
390 | ||
391 | begin | |
392 | F1 := First_Formal (Def_Id); | |
393 | F2 := First_Formal (Prev); | |
394 | ||
395 | while Present (F1) loop | |
396 | Set_Spec_Entity (F1, F2); | |
397 | Next_Formal (F1); | |
398 | Next_Formal (F2); | |
399 | end loop; | |
400 | end; | |
401 | ||
6d7e5c54 AC |
402 | else |
403 | Set_Is_Inlined (Defining_Entity (New_Body)); | |
404 | end if; | |
405 | ||
0b5b2bbc | 406 | -- If this is not a completion, create both a declaration and a body, so |
6d7e5c54 | 407 | -- that the expression can be inlined whenever possible. |
d2b10647 ES |
408 | |
409 | else | |
410 | New_Decl := | |
d2d4b355 | 411 | Make_Subprogram_Declaration (Loc, Specification => Spec); |
804ff4c3 | 412 | |
d2b10647 | 413 | Rewrite (N, New_Decl); |
b0186f71 | 414 | Analyze (N); |
d2b10647 ES |
415 | Set_Is_Inlined (Defining_Entity (New_Decl)); |
416 | ||
6d7e5c54 AC |
417 | -- To prevent premature freeze action, insert the new body at the end |
418 | -- of the current declarations, or at the end of the package spec. | |
b913199e AC |
419 | -- However, resolve usage names now, to prevent spurious visibility |
420 | -- on later entities. | |
6d7e5c54 AC |
421 | |
422 | declare | |
e876c43a AC |
423 | Decls : List_Id := List_Containing (N); |
424 | Par : constant Node_Id := Parent (Decls); | |
b913199e | 425 | Id : constant Entity_Id := Defining_Entity (New_Decl); |
6d7e5c54 AC |
426 | |
427 | begin | |
428 | if Nkind (Par) = N_Package_Specification | |
429 | and then Decls = Visible_Declarations (Par) | |
430 | and then Present (Private_Declarations (Par)) | |
431 | and then not Is_Empty_List (Private_Declarations (Par)) | |
432 | then | |
433 | Decls := Private_Declarations (Par); | |
434 | end if; | |
435 | ||
436 | Insert_After (Last (Decls), New_Body); | |
b913199e AC |
437 | Push_Scope (Id); |
438 | Install_Formals (Id); | |
439 | Preanalyze_Spec_Expression (Expression (Ret), Etype (Id)); | |
440 | End_Scope; | |
6d7e5c54 | 441 | end; |
b0186f71 | 442 | end if; |
0b5b2bbc AC |
443 | |
444 | -- If the return expression is a static constant, we suppress warning | |
445 | -- messages on unused formals, which in most cases will be noise. | |
446 | ||
447 | Set_Is_Trivial_Subprogram (Defining_Entity (New_Body), | |
448 | Is_OK_Static_Expression (Expr)); | |
b0186f71 AC |
449 | end Analyze_Expression_Function; |
450 | ||
ec4867fa ES |
451 | ---------------------------------------- |
452 | -- Analyze_Extended_Return_Statement -- | |
453 | ---------------------------------------- | |
454 | ||
455 | procedure Analyze_Extended_Return_Statement (N : Node_Id) is | |
456 | begin | |
5d37ba92 | 457 | Analyze_Return_Statement (N); |
ec4867fa ES |
458 | end Analyze_Extended_Return_Statement; |
459 | ||
996ae0b0 RK |
460 | ---------------------------- |
461 | -- Analyze_Function_Call -- | |
462 | ---------------------------- | |
463 | ||
464 | procedure Analyze_Function_Call (N : Node_Id) is | |
e24329cd YM |
465 | P : constant Node_Id := Name (N); |
466 | Actuals : constant List_Id := Parameter_Associations (N); | |
467 | Actual : Node_Id; | |
996ae0b0 RK |
468 | |
469 | begin | |
470 | Analyze (P); | |
471 | ||
3e7302c3 AC |
472 | -- A call of the form A.B (X) may be an Ada 2005 call, which is |
473 | -- rewritten as B (A, X). If the rewriting is successful, the call | |
474 | -- has been analyzed and we just return. | |
82c80734 RD |
475 | |
476 | if Nkind (P) = N_Selected_Component | |
477 | and then Name (N) /= P | |
478 | and then Is_Rewrite_Substitution (N) | |
479 | and then Present (Etype (N)) | |
480 | then | |
481 | return; | |
482 | end if; | |
483 | ||
996ae0b0 RK |
484 | -- If error analyzing name, then set Any_Type as result type and return |
485 | ||
486 | if Etype (P) = Any_Type then | |
487 | Set_Etype (N, Any_Type); | |
488 | return; | |
489 | end if; | |
490 | ||
491 | -- Otherwise analyze the parameters | |
492 | ||
e24329cd YM |
493 | if Present (Actuals) then |
494 | Actual := First (Actuals); | |
996ae0b0 RK |
495 | while Present (Actual) loop |
496 | Analyze (Actual); | |
497 | Check_Parameterless_Call (Actual); | |
498 | Next (Actual); | |
499 | end loop; | |
500 | end if; | |
501 | ||
502 | Analyze_Call (N); | |
996ae0b0 RK |
503 | end Analyze_Function_Call; |
504 | ||
ec4867fa ES |
505 | ----------------------------- |
506 | -- Analyze_Function_Return -- | |
507 | ----------------------------- | |
508 | ||
509 | procedure Analyze_Function_Return (N : Node_Id) is | |
510 | Loc : constant Source_Ptr := Sloc (N); | |
511 | Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); | |
512 | Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); | |
513 | ||
5d37ba92 | 514 | R_Type : constant Entity_Id := Etype (Scope_Id); |
ec4867fa ES |
515 | -- Function result subtype |
516 | ||
517 | procedure Check_Limited_Return (Expr : Node_Id); | |
518 | -- Check the appropriate (Ada 95 or Ada 2005) rules for returning | |
519 | -- limited types. Used only for simple return statements. | |
520 | -- Expr is the expression returned. | |
521 | ||
522 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); | |
523 | -- Check that the return_subtype_indication properly matches the result | |
524 | -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). | |
525 | ||
526 | -------------------------- | |
527 | -- Check_Limited_Return -- | |
528 | -------------------------- | |
529 | ||
530 | procedure Check_Limited_Return (Expr : Node_Id) is | |
531 | begin | |
532 | -- Ada 2005 (AI-318-02): Return-by-reference types have been | |
533 | -- removed and replaced by anonymous access results. This is an | |
534 | -- incompatibility with Ada 95. Not clear whether this should be | |
535 | -- enforced yet or perhaps controllable with special switch. ??? | |
536 | ||
ce72a9a3 AC |
537 | -- A limited interface that is not immutably limited is OK. |
538 | ||
539 | if Is_Limited_Interface (R_Type) | |
540 | and then | |
541 | not (Is_Task_Interface (R_Type) | |
542 | or else Is_Protected_Interface (R_Type) | |
543 | or else Is_Synchronized_Interface (R_Type)) | |
544 | then | |
545 | null; | |
546 | ||
547 | elsif Is_Limited_Type (R_Type) | |
548 | and then not Is_Interface (R_Type) | |
ec4867fa ES |
549 | and then Comes_From_Source (N) |
550 | and then not In_Instance_Body | |
2a31c32b | 551 | and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
ec4867fa ES |
552 | then |
553 | -- Error in Ada 2005 | |
554 | ||
0791fbe9 | 555 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
556 | and then not Debug_Flag_Dot_L |
557 | and then not GNAT_Mode | |
558 | then | |
559 | Error_Msg_N | |
560 | ("(Ada 2005) cannot copy object of a limited type " & | |
5d37ba92 | 561 | "(RM-2005 6.5(5.5/2))", Expr); |
e0ae93e2 | 562 | |
40f07b4b | 563 | if Is_Immutably_Limited_Type (R_Type) then |
ec4867fa ES |
564 | Error_Msg_N |
565 | ("\return by reference not permitted in Ada 2005", Expr); | |
566 | end if; | |
567 | ||
568 | -- Warn in Ada 95 mode, to give folks a heads up about this | |
569 | -- incompatibility. | |
570 | ||
571 | -- In GNAT mode, this is just a warning, to allow it to be | |
572 | -- evilly turned off. Otherwise it is a real error. | |
573 | ||
9694c039 AC |
574 | -- In a generic context, simplify the warning because it makes |
575 | -- no sense to discuss pass-by-reference or copy. | |
576 | ||
ec4867fa | 577 | elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
9694c039 AC |
578 | if Inside_A_Generic then |
579 | Error_Msg_N | |
885c4871 | 580 | ("return of limited object not permitted in Ada 2005 " |
20261dc1 | 581 | & "(RM-2005 6.5(5.5/2))?", Expr); |
9694c039 AC |
582 | |
583 | elsif Is_Immutably_Limited_Type (R_Type) then | |
ec4867fa | 584 | Error_Msg_N |
20261dc1 AC |
585 | ("return by reference not permitted in Ada 2005 " |
586 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
ec4867fa ES |
587 | else |
588 | Error_Msg_N | |
20261dc1 AC |
589 | ("cannot copy object of a limited type in Ada 2005 " |
590 | & "(RM-2005 6.5(5.5/2))?", Expr); | |
ec4867fa ES |
591 | end if; |
592 | ||
593 | -- Ada 95 mode, compatibility warnings disabled | |
594 | ||
595 | else | |
596 | return; -- skip continuation messages below | |
597 | end if; | |
598 | ||
9694c039 AC |
599 | if not Inside_A_Generic then |
600 | Error_Msg_N | |
601 | ("\consider switching to return of access type", Expr); | |
602 | Explain_Limited_Type (R_Type, Expr); | |
603 | end if; | |
ec4867fa ES |
604 | end if; |
605 | end Check_Limited_Return; | |
606 | ||
607 | ------------------------------------- | |
608 | -- Check_Return_Subtype_Indication -- | |
609 | ------------------------------------- | |
610 | ||
611 | procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is | |
7665e4bd AC |
612 | Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
613 | ||
614 | R_Stm_Type : constant Entity_Id := Etype (Return_Obj); | |
615 | -- Subtype given in the extended return statement (must match R_Type) | |
ec4867fa ES |
616 | |
617 | Subtype_Ind : constant Node_Id := | |
618 | Object_Definition (Original_Node (Obj_Decl)); | |
619 | ||
620 | R_Type_Is_Anon_Access : | |
621 | constant Boolean := | |
622 | Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type | |
623 | or else | |
624 | Ekind (R_Type) = E_Anonymous_Access_Protected_Subprogram_Type | |
625 | or else | |
626 | Ekind (R_Type) = E_Anonymous_Access_Type; | |
627 | -- True if return type of the function is an anonymous access type | |
628 | -- Can't we make Is_Anonymous_Access_Type in einfo ??? | |
629 | ||
630 | R_Stm_Type_Is_Anon_Access : | |
631 | constant Boolean := | |
0a36105d | 632 | Ekind (R_Stm_Type) = E_Anonymous_Access_Subprogram_Type |
ec4867fa | 633 | or else |
0a36105d | 634 | Ekind (R_Stm_Type) = E_Anonymous_Access_Protected_Subprogram_Type |
ec4867fa | 635 | or else |
0a36105d | 636 | Ekind (R_Stm_Type) = E_Anonymous_Access_Type; |
ec4867fa ES |
637 | -- True if type of the return object is an anonymous access type |
638 | ||
639 | begin | |
7665e4bd | 640 | -- First, avoid cascaded errors |
ec4867fa ES |
641 | |
642 | if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then | |
643 | return; | |
644 | end if; | |
645 | ||
646 | -- "return access T" case; check that the return statement also has | |
647 | -- "access T", and that the subtypes statically match: | |
53cf4600 | 648 | -- if this is an access to subprogram the signatures must match. |
ec4867fa ES |
649 | |
650 | if R_Type_Is_Anon_Access then | |
651 | if R_Stm_Type_Is_Anon_Access then | |
53cf4600 ES |
652 | if |
653 | Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type | |
0a36105d | 654 | then |
53cf4600 ES |
655 | if Base_Type (Designated_Type (R_Stm_Type)) /= |
656 | Base_Type (Designated_Type (R_Type)) | |
657 | or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) | |
658 | then | |
659 | Error_Msg_N | |
660 | ("subtype must statically match function result subtype", | |
661 | Subtype_Mark (Subtype_Ind)); | |
662 | end if; | |
663 | ||
664 | else | |
665 | -- For two anonymous access to subprogram types, the | |
666 | -- types themselves must be type conformant. | |
667 | ||
668 | if not Conforming_Types | |
669 | (R_Stm_Type, R_Type, Fully_Conformant) | |
670 | then | |
671 | Error_Msg_N | |
672 | ("subtype must statically match function result subtype", | |
673 | Subtype_Ind); | |
674 | end if; | |
ec4867fa | 675 | end if; |
0a36105d | 676 | |
ec4867fa ES |
677 | else |
678 | Error_Msg_N ("must use anonymous access type", Subtype_Ind); | |
679 | end if; | |
680 | ||
6cce2156 GD |
681 | -- If the return object is of an anonymous access type, then report |
682 | -- an error if the function's result type is not also anonymous. | |
683 | ||
684 | elsif R_Stm_Type_Is_Anon_Access | |
685 | and then not R_Type_Is_Anon_Access | |
686 | then | |
687 | Error_Msg_N ("anonymous access not allowed for function with " & | |
688 | "named access result", Subtype_Ind); | |
689 | ||
81d93365 AC |
690 | -- Subtype indication case: check that the return object's type is |
691 | -- covered by the result type, and that the subtypes statically match | |
692 | -- when the result subtype is constrained. Also handle record types | |
693 | -- with unknown discriminants for which we have built the underlying | |
694 | -- record view. Coverage is needed to allow specific-type return | |
695 | -- objects when the result type is class-wide (see AI05-32). | |
696 | ||
697 | elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) | |
9013065b | 698 | or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
212863c0 AC |
699 | and then |
700 | Covers | |
701 | (Base_Type (R_Type), | |
702 | Underlying_Record_View (Base_Type (R_Stm_Type)))) | |
9013065b AC |
703 | then |
704 | -- A null exclusion may be present on the return type, on the | |
705 | -- function specification, on the object declaration or on the | |
706 | -- subtype itself. | |
ec4867fa | 707 | |
21d27997 RD |
708 | if Is_Access_Type (R_Type) |
709 | and then | |
710 | (Can_Never_Be_Null (R_Type) | |
711 | or else Null_Exclusion_Present (Parent (Scope_Id))) /= | |
712 | Can_Never_Be_Null (R_Stm_Type) | |
713 | then | |
714 | Error_Msg_N | |
715 | ("subtype must statically match function result subtype", | |
716 | Subtype_Ind); | |
717 | end if; | |
718 | ||
105b5e65 | 719 | -- AI05-103: for elementary types, subtypes must statically match |
8779dffa AC |
720 | |
721 | if Is_Constrained (R_Type) | |
722 | or else Is_Access_Type (R_Type) | |
723 | then | |
ec4867fa ES |
724 | if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
725 | Error_Msg_N | |
0a36105d JM |
726 | ("subtype must statically match function result subtype", |
727 | Subtype_Ind); | |
ec4867fa ES |
728 | end if; |
729 | end if; | |
730 | ||
ff7139c3 AC |
731 | elsif Etype (Base_Type (R_Type)) = R_Stm_Type |
732 | and then Is_Null_Extension (Base_Type (R_Type)) | |
733 | then | |
734 | null; | |
735 | ||
ec4867fa ES |
736 | else |
737 | Error_Msg_N | |
738 | ("wrong type for return_subtype_indication", Subtype_Ind); | |
739 | end if; | |
740 | end Check_Return_Subtype_Indication; | |
741 | ||
742 | --------------------- | |
743 | -- Local Variables -- | |
744 | --------------------- | |
745 | ||
746 | Expr : Node_Id; | |
747 | ||
748 | -- Start of processing for Analyze_Function_Return | |
749 | ||
750 | begin | |
751 | Set_Return_Present (Scope_Id); | |
752 | ||
5d37ba92 | 753 | if Nkind (N) = N_Simple_Return_Statement then |
ec4867fa | 754 | Expr := Expression (N); |
4ee646da | 755 | |
e917aec2 RD |
756 | -- Guard against a malformed expression. The parser may have tried to |
757 | -- recover but the node is not analyzable. | |
4ee646da AC |
758 | |
759 | if Nkind (Expr) = N_Error then | |
760 | Set_Etype (Expr, Any_Type); | |
761 | Expander_Mode_Save_And_Set (False); | |
762 | return; | |
763 | ||
764 | else | |
0180fd26 AC |
765 | -- The resolution of a controlled [extension] aggregate associated |
766 | -- with a return statement creates a temporary which needs to be | |
767 | -- finalized on function exit. Wrap the return statement inside a | |
768 | -- block so that the finalization machinery can detect this case. | |
769 | -- This early expansion is done only when the return statement is | |
770 | -- not part of a handled sequence of statements. | |
771 | ||
772 | if Nkind_In (Expr, N_Aggregate, | |
773 | N_Extension_Aggregate) | |
774 | and then Needs_Finalization (R_Type) | |
775 | and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements | |
776 | then | |
777 | Rewrite (N, | |
778 | Make_Block_Statement (Loc, | |
779 | Handled_Statement_Sequence => | |
780 | Make_Handled_Sequence_Of_Statements (Loc, | |
781 | Statements => New_List (Relocate_Node (N))))); | |
782 | ||
783 | Analyze (N); | |
784 | return; | |
785 | end if; | |
786 | ||
4ee646da AC |
787 | Analyze_And_Resolve (Expr, R_Type); |
788 | Check_Limited_Return (Expr); | |
789 | end if; | |
ec4867fa | 790 | |
ad05f2e9 | 791 | -- RETURN only allowed in SPARK as the last statement in function |
607d0635 | 792 | |
fe5d3068 | 793 | if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
607d0635 AC |
794 | and then |
795 | (Nkind (Parent (Parent (N))) /= N_Subprogram_Body | |
8d606a78 | 796 | or else Present (Next (N))) |
607d0635 | 797 | then |
2ba431e5 | 798 | Check_SPARK_Restriction |
fe5d3068 | 799 | ("RETURN should be the last statement in function", N); |
607d0635 AC |
800 | end if; |
801 | ||
ec4867fa | 802 | else |
2ba431e5 | 803 | Check_SPARK_Restriction ("extended RETURN is not allowed", N); |
607d0635 | 804 | |
ec4867fa ES |
805 | -- Analyze parts specific to extended_return_statement: |
806 | ||
807 | declare | |
808 | Obj_Decl : constant Node_Id := | |
809 | Last (Return_Object_Declarations (N)); | |
810 | ||
811 | HSS : constant Node_Id := Handled_Statement_Sequence (N); | |
812 | ||
813 | begin | |
814 | Expr := Expression (Obj_Decl); | |
815 | ||
816 | -- Note: The check for OK_For_Limited_Init will happen in | |
817 | -- Analyze_Object_Declaration; we treat it as a normal | |
818 | -- object declaration. | |
819 | ||
cd1c668b | 820 | Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
ec4867fa ES |
821 | Analyze (Obj_Decl); |
822 | ||
ec4867fa ES |
823 | Check_Return_Subtype_Indication (Obj_Decl); |
824 | ||
825 | if Present (HSS) then | |
826 | Analyze (HSS); | |
827 | ||
828 | if Present (Exception_Handlers (HSS)) then | |
829 | ||
830 | -- ???Has_Nested_Block_With_Handler needs to be set. | |
831 | -- Probably by creating an actual N_Block_Statement. | |
832 | -- Probably in Expand. | |
833 | ||
834 | null; | |
835 | end if; | |
836 | end if; | |
837 | ||
9337aa0a AC |
838 | -- Mark the return object as referenced, since the return is an |
839 | -- implicit reference of the object. | |
840 | ||
841 | Set_Referenced (Defining_Identifier (Obj_Decl)); | |
842 | ||
ec4867fa ES |
843 | Check_References (Stm_Entity); |
844 | end; | |
845 | end if; | |
846 | ||
21d27997 | 847 | -- Case of Expr present |
5d37ba92 | 848 | |
ec4867fa | 849 | if Present (Expr) |
21d27997 RD |
850 | |
851 | -- Defend against previous errors | |
852 | ||
853 | and then Nkind (Expr) /= N_Empty | |
5d37ba92 | 854 | and then Present (Etype (Expr)) |
ec4867fa | 855 | then |
5d37ba92 ES |
856 | -- Apply constraint check. Note that this is done before the implicit |
857 | -- conversion of the expression done for anonymous access types to | |
f3d57416 | 858 | -- ensure correct generation of the null-excluding check associated |
5d37ba92 ES |
859 | -- with null-excluding expressions found in return statements. |
860 | ||
861 | Apply_Constraint_Check (Expr, R_Type); | |
862 | ||
863 | -- Ada 2005 (AI-318-02): When the result type is an anonymous access | |
864 | -- type, apply an implicit conversion of the expression to that type | |
865 | -- to force appropriate static and run-time accessibility checks. | |
ec4867fa | 866 | |
0791fbe9 | 867 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
868 | and then Ekind (R_Type) = E_Anonymous_Access_Type |
869 | then | |
870 | Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); | |
871 | Analyze_And_Resolve (Expr, R_Type); | |
872 | end if; | |
873 | ||
21d27997 RD |
874 | -- If the result type is class-wide, then check that the return |
875 | -- expression's type is not declared at a deeper level than the | |
876 | -- function (RM05-6.5(5.6/2)). | |
877 | ||
0791fbe9 | 878 | if Ada_Version >= Ada_2005 |
21d27997 RD |
879 | and then Is_Class_Wide_Type (R_Type) |
880 | then | |
881 | if Type_Access_Level (Etype (Expr)) > | |
882 | Subprogram_Access_Level (Scope_Id) | |
883 | then | |
884 | Error_Msg_N | |
885 | ("level of return expression type is deeper than " & | |
886 | "class-wide function!", Expr); | |
887 | end if; | |
888 | end if; | |
889 | ||
4755cce9 JM |
890 | -- Check incorrect use of dynamically tagged expression |
891 | ||
892 | if Is_Tagged_Type (R_Type) then | |
893 | Check_Dynamically_Tagged_Expression | |
894 | (Expr => Expr, | |
895 | Typ => R_Type, | |
896 | Related_Nod => N); | |
ec4867fa ES |
897 | end if; |
898 | ||
ec4867fa ES |
899 | -- ??? A real run-time accessibility check is needed in cases |
900 | -- involving dereferences of access parameters. For now we just | |
901 | -- check the static cases. | |
902 | ||
0791fbe9 | 903 | if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
40f07b4b | 904 | and then Is_Immutably_Limited_Type (Etype (Scope_Id)) |
ec4867fa ES |
905 | and then Object_Access_Level (Expr) > |
906 | Subprogram_Access_Level (Scope_Id) | |
907 | then | |
ec4867fa | 908 | |
9694c039 AC |
909 | -- Suppress the message in a generic, where the rewriting |
910 | -- is irrelevant. | |
911 | ||
912 | if Inside_A_Generic then | |
913 | null; | |
914 | ||
915 | else | |
916 | Rewrite (N, | |
917 | Make_Raise_Program_Error (Loc, | |
918 | Reason => PE_Accessibility_Check_Failed)); | |
919 | Analyze (N); | |
920 | ||
921 | Error_Msg_N | |
922 | ("cannot return a local value by reference?", N); | |
923 | Error_Msg_NE | |
924 | ("\& will be raised at run time?", | |
925 | N, Standard_Program_Error); | |
926 | end if; | |
ec4867fa | 927 | end if; |
5d37ba92 ES |
928 | |
929 | if Known_Null (Expr) | |
930 | and then Nkind (Parent (Scope_Id)) = N_Function_Specification | |
931 | and then Null_Exclusion_Present (Parent (Scope_Id)) | |
932 | then | |
933 | Apply_Compile_Time_Constraint_Error | |
934 | (N => Expr, | |
935 | Msg => "(Ada 2005) null not allowed for " | |
936 | & "null-excluding return?", | |
937 | Reason => CE_Null_Not_Allowed); | |
938 | end if; | |
cd5a9750 AC |
939 | |
940 | -- Apply checks suggested by AI05-0144 (dangerous order dependence) | |
cd5a9750 | 941 | |
1e194575 | 942 | Check_Order_Dependence; |
ec4867fa ES |
943 | end if; |
944 | end Analyze_Function_Return; | |
945 | ||
996ae0b0 RK |
946 | ------------------------------------- |
947 | -- Analyze_Generic_Subprogram_Body -- | |
948 | ------------------------------------- | |
949 | ||
950 | procedure Analyze_Generic_Subprogram_Body | |
951 | (N : Node_Id; | |
952 | Gen_Id : Entity_Id) | |
953 | is | |
fbf5a39b | 954 | Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
996ae0b0 | 955 | Kind : constant Entity_Kind := Ekind (Gen_Id); |
fbf5a39b | 956 | Body_Id : Entity_Id; |
996ae0b0 | 957 | New_N : Node_Id; |
fbf5a39b | 958 | Spec : Node_Id; |
996ae0b0 RK |
959 | |
960 | begin | |
82c80734 RD |
961 | -- Copy body and disable expansion while analyzing the generic For a |
962 | -- stub, do not copy the stub (which would load the proper body), this | |
963 | -- will be done when the proper body is analyzed. | |
996ae0b0 RK |
964 | |
965 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
966 | New_N := Copy_Generic_Node (N, Empty, Instantiating => False); | |
967 | Rewrite (N, New_N); | |
968 | Start_Generic; | |
969 | end if; | |
970 | ||
971 | Spec := Specification (N); | |
972 | ||
973 | -- Within the body of the generic, the subprogram is callable, and | |
974 | -- behaves like the corresponding non-generic unit. | |
975 | ||
fbf5a39b | 976 | Body_Id := Defining_Entity (Spec); |
996ae0b0 RK |
977 | |
978 | if Kind = E_Generic_Procedure | |
979 | and then Nkind (Spec) /= N_Procedure_Specification | |
980 | then | |
fbf5a39b | 981 | Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
996ae0b0 RK |
982 | return; |
983 | ||
984 | elsif Kind = E_Generic_Function | |
985 | and then Nkind (Spec) /= N_Function_Specification | |
986 | then | |
fbf5a39b | 987 | Error_Msg_N ("invalid body for generic function ", Body_Id); |
996ae0b0 RK |
988 | return; |
989 | end if; | |
990 | ||
fbf5a39b | 991 | Set_Corresponding_Body (Gen_Decl, Body_Id); |
996ae0b0 RK |
992 | |
993 | if Has_Completion (Gen_Id) | |
994 | and then Nkind (Parent (N)) /= N_Subunit | |
995 | then | |
996 | Error_Msg_N ("duplicate generic body", N); | |
997 | return; | |
998 | else | |
999 | Set_Has_Completion (Gen_Id); | |
1000 | end if; | |
1001 | ||
1002 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1003 | Set_Ekind (Defining_Entity (Specification (N)), Kind); | |
1004 | else | |
1005 | Set_Corresponding_Spec (N, Gen_Id); | |
1006 | end if; | |
1007 | ||
1008 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
1009 | Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); | |
1010 | end if; | |
1011 | ||
1012 | -- Make generic parameters immediately visible in the body. They are | |
1013 | -- needed to process the formals declarations. Then make the formals | |
1014 | -- visible in a separate step. | |
1015 | ||
0a36105d | 1016 | Push_Scope (Gen_Id); |
996ae0b0 RK |
1017 | |
1018 | declare | |
1019 | E : Entity_Id; | |
1020 | First_Ent : Entity_Id; | |
1021 | ||
1022 | begin | |
1023 | First_Ent := First_Entity (Gen_Id); | |
1024 | ||
1025 | E := First_Ent; | |
1026 | while Present (E) and then not Is_Formal (E) loop | |
1027 | Install_Entity (E); | |
1028 | Next_Entity (E); | |
1029 | end loop; | |
1030 | ||
1031 | Set_Use (Generic_Formal_Declarations (Gen_Decl)); | |
1032 | ||
1033 | -- Now generic formals are visible, and the specification can be | |
1034 | -- analyzed, for subsequent conformance check. | |
1035 | ||
fbf5a39b | 1036 | Body_Id := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 1037 | |
fbf5a39b | 1038 | -- Make formal parameters visible |
996ae0b0 RK |
1039 | |
1040 | if Present (E) then | |
1041 | ||
fbf5a39b AC |
1042 | -- E is the first formal parameter, we loop through the formals |
1043 | -- installing them so that they will be visible. | |
996ae0b0 RK |
1044 | |
1045 | Set_First_Entity (Gen_Id, E); | |
996ae0b0 RK |
1046 | while Present (E) loop |
1047 | Install_Entity (E); | |
1048 | Next_Formal (E); | |
1049 | end loop; | |
1050 | end if; | |
1051 | ||
e895b435 | 1052 | -- Visible generic entity is callable within its own body |
996ae0b0 | 1053 | |
ec4867fa ES |
1054 | Set_Ekind (Gen_Id, Ekind (Body_Id)); |
1055 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
1056 | Set_Convention (Body_Id, Convention (Gen_Id)); | |
1057 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); | |
1058 | Set_Scope (Body_Id, Scope (Gen_Id)); | |
fbf5a39b AC |
1059 | Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
1060 | ||
1061 | if Nkind (N) = N_Subprogram_Body_Stub then | |
1062 | ||
e895b435 | 1063 | -- No body to analyze, so restore state of generic unit |
fbf5a39b AC |
1064 | |
1065 | Set_Ekind (Gen_Id, Kind); | |
1066 | Set_Ekind (Body_Id, Kind); | |
1067 | ||
1068 | if Present (First_Ent) then | |
1069 | Set_First_Entity (Gen_Id, First_Ent); | |
1070 | end if; | |
1071 | ||
1072 | End_Scope; | |
1073 | return; | |
1074 | end if; | |
996ae0b0 | 1075 | |
82c80734 RD |
1076 | -- If this is a compilation unit, it must be made visible explicitly, |
1077 | -- because the compilation of the declaration, unlike other library | |
1078 | -- unit declarations, does not. If it is not a unit, the following | |
1079 | -- is redundant but harmless. | |
996ae0b0 RK |
1080 | |
1081 | Set_Is_Immediately_Visible (Gen_Id); | |
fbf5a39b | 1082 | Reference_Body_Formals (Gen_Id, Body_Id); |
996ae0b0 | 1083 | |
ec4867fa ES |
1084 | if Is_Child_Unit (Gen_Id) then |
1085 | Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); | |
1086 | end if; | |
1087 | ||
996ae0b0 | 1088 | Set_Actual_Subtypes (N, Current_Scope); |
483361a6 AC |
1089 | |
1090 | -- Deal with preconditions and postconditions. In formal verification | |
1091 | -- mode, we keep pre- and postconditions attached to entities rather | |
1092 | -- than inserted in the code, in order to facilitate a distinct | |
1093 | -- treatment for them. | |
1094 | ||
56812278 | 1095 | if not Alfa_Mode then |
483361a6 AC |
1096 | Process_PPCs (N, Gen_Id, Body_Id); |
1097 | end if; | |
0dabde3a ES |
1098 | |
1099 | -- If the generic unit carries pre- or post-conditions, copy them | |
1100 | -- to the original generic tree, so that they are properly added | |
1101 | -- to any instantiation. | |
1102 | ||
1103 | declare | |
1104 | Orig : constant Node_Id := Original_Node (N); | |
1105 | Cond : Node_Id; | |
1106 | ||
1107 | begin | |
1108 | Cond := First (Declarations (N)); | |
1109 | while Present (Cond) loop | |
1110 | if Nkind (Cond) = N_Pragma | |
1111 | and then Pragma_Name (Cond) = Name_Check | |
1112 | then | |
1113 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1114 | ||
1115 | elsif Nkind (Cond) = N_Pragma | |
1116 | and then Pragma_Name (Cond) = Name_Postcondition | |
1117 | then | |
1118 | Set_Ekind (Defining_Entity (Orig), Ekind (Gen_Id)); | |
1119 | Prepend (New_Copy_Tree (Cond), Declarations (Orig)); | |
1120 | else | |
1121 | exit; | |
1122 | end if; | |
1123 | ||
1124 | Next (Cond); | |
1125 | end loop; | |
1126 | end; | |
1127 | ||
996ae0b0 RK |
1128 | Analyze_Declarations (Declarations (N)); |
1129 | Check_Completion; | |
1130 | Analyze (Handled_Statement_Sequence (N)); | |
1131 | ||
1132 | Save_Global_References (Original_Node (N)); | |
1133 | ||
82c80734 RD |
1134 | -- Prior to exiting the scope, include generic formals again (if any |
1135 | -- are present) in the set of local entities. | |
996ae0b0 RK |
1136 | |
1137 | if Present (First_Ent) then | |
1138 | Set_First_Entity (Gen_Id, First_Ent); | |
1139 | end if; | |
1140 | ||
fbf5a39b | 1141 | Check_References (Gen_Id); |
996ae0b0 RK |
1142 | end; |
1143 | ||
e6f69614 | 1144 | Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
996ae0b0 RK |
1145 | End_Scope; |
1146 | Check_Subprogram_Order (N); | |
1147 | ||
e895b435 | 1148 | -- Outside of its body, unit is generic again |
996ae0b0 RK |
1149 | |
1150 | Set_Ekind (Gen_Id, Kind); | |
fbf5a39b | 1151 | Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
5d37ba92 ES |
1152 | |
1153 | if Style_Check then | |
1154 | Style.Check_Identifier (Body_Id, Gen_Id); | |
1155 | end if; | |
13d923cc | 1156 | |
996ae0b0 | 1157 | End_Generic; |
996ae0b0 RK |
1158 | end Analyze_Generic_Subprogram_Body; |
1159 | ||
1160 | ----------------------------- | |
1161 | -- Analyze_Operator_Symbol -- | |
1162 | ----------------------------- | |
1163 | ||
82c80734 RD |
1164 | -- An operator symbol such as "+" or "and" may appear in context where the |
1165 | -- literal denotes an entity name, such as "+"(x, y) or in context when it | |
1166 | -- is just a string, as in (conjunction = "or"). In these cases the parser | |
1167 | -- generates this node, and the semantics does the disambiguation. Other | |
1168 | -- such case are actuals in an instantiation, the generic unit in an | |
1169 | -- instantiation, and pragma arguments. | |
996ae0b0 RK |
1170 | |
1171 | procedure Analyze_Operator_Symbol (N : Node_Id) is | |
1172 | Par : constant Node_Id := Parent (N); | |
1173 | ||
1174 | begin | |
800621e0 RD |
1175 | if (Nkind (Par) = N_Function_Call |
1176 | and then N = Name (Par)) | |
996ae0b0 | 1177 | or else Nkind (Par) = N_Function_Instantiation |
800621e0 RD |
1178 | or else (Nkind (Par) = N_Indexed_Component |
1179 | and then N = Prefix (Par)) | |
996ae0b0 RK |
1180 | or else (Nkind (Par) = N_Pragma_Argument_Association |
1181 | and then not Is_Pragma_String_Literal (Par)) | |
1182 | or else Nkind (Par) = N_Subprogram_Renaming_Declaration | |
800621e0 RD |
1183 | or else (Nkind (Par) = N_Attribute_Reference |
1184 | and then Attribute_Name (Par) /= Name_Value) | |
996ae0b0 RK |
1185 | then |
1186 | Find_Direct_Name (N); | |
1187 | ||
1188 | else | |
1189 | Change_Operator_Symbol_To_String_Literal (N); | |
1190 | Analyze (N); | |
1191 | end if; | |
1192 | end Analyze_Operator_Symbol; | |
1193 | ||
1194 | ----------------------------------- | |
1195 | -- Analyze_Parameter_Association -- | |
1196 | ----------------------------------- | |
1197 | ||
1198 | procedure Analyze_Parameter_Association (N : Node_Id) is | |
1199 | begin | |
1200 | Analyze (Explicit_Actual_Parameter (N)); | |
1201 | end Analyze_Parameter_Association; | |
1202 | ||
1203 | ---------------------------- | |
1204 | -- Analyze_Procedure_Call -- | |
1205 | ---------------------------- | |
1206 | ||
1207 | procedure Analyze_Procedure_Call (N : Node_Id) is | |
1208 | Loc : constant Source_Ptr := Sloc (N); | |
1209 | P : constant Node_Id := Name (N); | |
1210 | Actuals : constant List_Id := Parameter_Associations (N); | |
1211 | Actual : Node_Id; | |
1212 | New_N : Node_Id; | |
1213 | ||
1214 | procedure Analyze_Call_And_Resolve; | |
1215 | -- Do Analyze and Resolve calls for procedure call | |
cd5a9750 | 1216 | -- At end, check illegal order dependence. |
996ae0b0 | 1217 | |
fbf5a39b AC |
1218 | ------------------------------ |
1219 | -- Analyze_Call_And_Resolve -- | |
1220 | ------------------------------ | |
1221 | ||
996ae0b0 RK |
1222 | procedure Analyze_Call_And_Resolve is |
1223 | begin | |
1224 | if Nkind (N) = N_Procedure_Call_Statement then | |
1225 | Analyze_Call (N); | |
1226 | Resolve (N, Standard_Void_Type); | |
cd5a9750 | 1227 | |
1e194575 | 1228 | -- Apply checks suggested by AI05-0144 |
cd5a9750 | 1229 | |
1e194575 | 1230 | Check_Order_Dependence; |
cd5a9750 | 1231 | |
996ae0b0 RK |
1232 | else |
1233 | Analyze (N); | |
1234 | end if; | |
1235 | end Analyze_Call_And_Resolve; | |
1236 | ||
1237 | -- Start of processing for Analyze_Procedure_Call | |
1238 | ||
1239 | begin | |
1240 | -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote | |
1241 | -- a procedure call or an entry call. The prefix may denote an access | |
1242 | -- to subprogram type, in which case an implicit dereference applies. | |
f3d57416 | 1243 | -- If the prefix is an indexed component (without implicit dereference) |
996ae0b0 RK |
1244 | -- then the construct denotes a call to a member of an entire family. |
1245 | -- If the prefix is a simple name, it may still denote a call to a | |
1246 | -- parameterless member of an entry family. Resolution of these various | |
1247 | -- interpretations is delicate. | |
1248 | ||
1249 | Analyze (P); | |
1250 | ||
758c442c GD |
1251 | -- If this is a call of the form Obj.Op, the call may have been |
1252 | -- analyzed and possibly rewritten into a block, in which case | |
1253 | -- we are done. | |
1254 | ||
1255 | if Analyzed (N) then | |
1256 | return; | |
1257 | end if; | |
1258 | ||
7415029d AC |
1259 | -- If there is an error analyzing the name (which may have been |
1260 | -- rewritten if the original call was in prefix notation) then error | |
1261 | -- has been emitted already, mark node and return. | |
996ae0b0 | 1262 | |
7415029d AC |
1263 | if Error_Posted (N) |
1264 | or else Etype (Name (N)) = Any_Type | |
1265 | then | |
996ae0b0 RK |
1266 | Set_Etype (N, Any_Type); |
1267 | return; | |
1268 | end if; | |
1269 | ||
1270 | -- Otherwise analyze the parameters | |
1271 | ||
1272 | if Present (Actuals) then | |
1273 | Actual := First (Actuals); | |
1274 | ||
1275 | while Present (Actual) loop | |
1276 | Analyze (Actual); | |
1277 | Check_Parameterless_Call (Actual); | |
1278 | Next (Actual); | |
1279 | end loop; | |
1280 | end if; | |
1281 | ||
0bfc9a64 | 1282 | -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
996ae0b0 RK |
1283 | |
1284 | if Nkind (P) = N_Attribute_Reference | |
1285 | and then (Attribute_Name (P) = Name_Elab_Spec | |
0bfc9a64 AC |
1286 | or else Attribute_Name (P) = Name_Elab_Body |
1287 | or else Attribute_Name (P) = Name_Elab_Subp_Body) | |
996ae0b0 RK |
1288 | then |
1289 | if Present (Actuals) then | |
1290 | Error_Msg_N | |
1291 | ("no parameters allowed for this call", First (Actuals)); | |
1292 | return; | |
1293 | end if; | |
1294 | ||
1295 | Set_Etype (N, Standard_Void_Type); | |
1296 | Set_Analyzed (N); | |
1297 | ||
1298 | elsif Is_Entity_Name (P) | |
1299 | and then Is_Record_Type (Etype (Entity (P))) | |
1300 | and then Remote_AST_I_Dereference (P) | |
1301 | then | |
1302 | return; | |
1303 | ||
1304 | elsif Is_Entity_Name (P) | |
1305 | and then Ekind (Entity (P)) /= E_Entry_Family | |
1306 | then | |
1307 | if Is_Access_Type (Etype (P)) | |
1308 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1309 | and then No (Actuals) | |
1310 | and then Comes_From_Source (N) | |
1311 | then | |
ed2233dc | 1312 | Error_Msg_N ("missing explicit dereference in call", N); |
996ae0b0 RK |
1313 | end if; |
1314 | ||
1315 | Analyze_Call_And_Resolve; | |
1316 | ||
1317 | -- If the prefix is the simple name of an entry family, this is | |
1318 | -- a parameterless call from within the task body itself. | |
1319 | ||
1320 | elsif Is_Entity_Name (P) | |
1321 | and then Nkind (P) = N_Identifier | |
1322 | and then Ekind (Entity (P)) = E_Entry_Family | |
1323 | and then Present (Actuals) | |
1324 | and then No (Next (First (Actuals))) | |
1325 | then | |
82c80734 RD |
1326 | -- Can be call to parameterless entry family. What appears to be the |
1327 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1328 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1329 | -- transformation. |
1330 | ||
1331 | New_N := | |
1332 | Make_Indexed_Component (Loc, | |
1333 | Prefix => | |
1334 | Make_Selected_Component (Loc, | |
1335 | Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), | |
1336 | Selector_Name => New_Occurrence_Of (Entity (P), Loc)), | |
1337 | Expressions => Actuals); | |
1338 | Set_Name (N, New_N); | |
1339 | Set_Etype (New_N, Standard_Void_Type); | |
1340 | Set_Parameter_Associations (N, No_List); | |
1341 | Analyze_Call_And_Resolve; | |
1342 | ||
1343 | elsif Nkind (P) = N_Explicit_Dereference then | |
1344 | if Ekind (Etype (P)) = E_Subprogram_Type then | |
1345 | Analyze_Call_And_Resolve; | |
1346 | else | |
1347 | Error_Msg_N ("expect access to procedure in call", P); | |
1348 | end if; | |
1349 | ||
82c80734 RD |
1350 | -- The name can be a selected component or an indexed component that |
1351 | -- yields an access to subprogram. Such a prefix is legal if the call | |
1352 | -- has parameter associations. | |
996ae0b0 RK |
1353 | |
1354 | elsif Is_Access_Type (Etype (P)) | |
1355 | and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type | |
1356 | then | |
1357 | if Present (Actuals) then | |
1358 | Analyze_Call_And_Resolve; | |
1359 | else | |
ed2233dc | 1360 | Error_Msg_N ("missing explicit dereference in call ", N); |
996ae0b0 RK |
1361 | end if; |
1362 | ||
82c80734 RD |
1363 | -- If not an access to subprogram, then the prefix must resolve to the |
1364 | -- name of an entry, entry family, or protected operation. | |
996ae0b0 | 1365 | |
82c80734 RD |
1366 | -- For the case of a simple entry call, P is a selected component where |
1367 | -- the prefix is the task and the selector name is the entry. A call to | |
1368 | -- a protected procedure will have the same syntax. If the protected | |
1369 | -- object contains overloaded operations, the entity may appear as a | |
1370 | -- function, the context will select the operation whose type is Void. | |
996ae0b0 RK |
1371 | |
1372 | elsif Nkind (P) = N_Selected_Component | |
1373 | and then (Ekind (Entity (Selector_Name (P))) = E_Entry | |
1374 | or else | |
1375 | Ekind (Entity (Selector_Name (P))) = E_Procedure | |
1376 | or else | |
1377 | Ekind (Entity (Selector_Name (P))) = E_Function) | |
1378 | then | |
1379 | Analyze_Call_And_Resolve; | |
1380 | ||
1381 | elsif Nkind (P) = N_Selected_Component | |
1382 | and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family | |
1383 | and then Present (Actuals) | |
1384 | and then No (Next (First (Actuals))) | |
1385 | then | |
82c80734 RD |
1386 | -- Can be call to parameterless entry family. What appears to be the |
1387 | -- sole argument is in fact the entry index. Rewrite prefix of node | |
1388 | -- accordingly. Source representation is unchanged by this | |
996ae0b0 RK |
1389 | -- transformation. |
1390 | ||
1391 | New_N := | |
1392 | Make_Indexed_Component (Loc, | |
1393 | Prefix => New_Copy (P), | |
1394 | Expressions => Actuals); | |
1395 | Set_Name (N, New_N); | |
1396 | Set_Etype (New_N, Standard_Void_Type); | |
1397 | Set_Parameter_Associations (N, No_List); | |
1398 | Analyze_Call_And_Resolve; | |
1399 | ||
1400 | -- For the case of a reference to an element of an entry family, P is | |
1401 | -- an indexed component whose prefix is a selected component (task and | |
1402 | -- entry family), and whose index is the entry family index. | |
1403 | ||
1404 | elsif Nkind (P) = N_Indexed_Component | |
1405 | and then Nkind (Prefix (P)) = N_Selected_Component | |
1406 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family | |
1407 | then | |
1408 | Analyze_Call_And_Resolve; | |
1409 | ||
1410 | -- If the prefix is the name of an entry family, it is a call from | |
1411 | -- within the task body itself. | |
1412 | ||
1413 | elsif Nkind (P) = N_Indexed_Component | |
1414 | and then Nkind (Prefix (P)) = N_Identifier | |
1415 | and then Ekind (Entity (Prefix (P))) = E_Entry_Family | |
1416 | then | |
1417 | New_N := | |
1418 | Make_Selected_Component (Loc, | |
1419 | Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), | |
1420 | Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); | |
1421 | Rewrite (Prefix (P), New_N); | |
1422 | Analyze (P); | |
1423 | Analyze_Call_And_Resolve; | |
1424 | ||
9f8d1e5c AC |
1425 | -- In Ada 2012. a qualified expression is a name, but it cannot be a |
1426 | -- procedure name, so the construct can only be a qualified expression. | |
1427 | ||
1428 | elsif Nkind (P) = N_Qualified_Expression | |
1429 | and then Ada_Version >= Ada_2012 | |
1430 | then | |
1431 | Rewrite (N, Make_Code_Statement (Loc, Expression => P)); | |
1432 | Analyze (N); | |
1433 | ||
e895b435 | 1434 | -- Anything else is an error |
996ae0b0 RK |
1435 | |
1436 | else | |
758c442c | 1437 | Error_Msg_N ("invalid procedure or entry call", N); |
996ae0b0 RK |
1438 | end if; |
1439 | end Analyze_Procedure_Call; | |
1440 | ||
b0186f71 AC |
1441 | ------------------------------ |
1442 | -- Analyze_Return_Statement -- | |
1443 | ------------------------------ | |
1444 | ||
1445 | procedure Analyze_Return_Statement (N : Node_Id) is | |
1446 | ||
1447 | pragma Assert (Nkind_In (N, N_Simple_Return_Statement, | |
1448 | N_Extended_Return_Statement)); | |
1449 | ||
1450 | Returns_Object : constant Boolean := | |
1451 | Nkind (N) = N_Extended_Return_Statement | |
1452 | or else | |
1453 | (Nkind (N) = N_Simple_Return_Statement | |
1454 | and then Present (Expression (N))); | |
1455 | -- True if we're returning something; that is, "return <expression>;" | |
1456 | -- or "return Result : T [:= ...]". False for "return;". Used for error | |
1457 | -- checking: If Returns_Object is True, N should apply to a function | |
1458 | -- body; otherwise N should apply to a procedure body, entry body, | |
1459 | -- accept statement, or extended return statement. | |
1460 | ||
1461 | function Find_What_It_Applies_To return Entity_Id; | |
1462 | -- Find the entity representing the innermost enclosing body, accept | |
1463 | -- statement, or extended return statement. If the result is a callable | |
1464 | -- construct or extended return statement, then this will be the value | |
1465 | -- of the Return_Applies_To attribute. Otherwise, the program is | |
1466 | -- illegal. See RM-6.5(4/2). | |
1467 | ||
1468 | ----------------------------- | |
1469 | -- Find_What_It_Applies_To -- | |
1470 | ----------------------------- | |
1471 | ||
1472 | function Find_What_It_Applies_To return Entity_Id is | |
1473 | Result : Entity_Id := Empty; | |
1474 | ||
1475 | begin | |
36b8f95f AC |
1476 | -- Loop outward through the Scope_Stack, skipping blocks, loops, |
1477 | -- and postconditions. | |
b0186f71 AC |
1478 | |
1479 | for J in reverse 0 .. Scope_Stack.Last loop | |
1480 | Result := Scope_Stack.Table (J).Entity; | |
11bc76df AC |
1481 | exit when not Ekind_In (Result, E_Block, E_Loop) |
1482 | and then Chars (Result) /= Name_uPostconditions; | |
b0186f71 AC |
1483 | end loop; |
1484 | ||
1485 | pragma Assert (Present (Result)); | |
1486 | return Result; | |
1487 | end Find_What_It_Applies_To; | |
1488 | ||
1489 | -- Local declarations | |
1490 | ||
1491 | Scope_Id : constant Entity_Id := Find_What_It_Applies_To; | |
1492 | Kind : constant Entity_Kind := Ekind (Scope_Id); | |
1493 | Loc : constant Source_Ptr := Sloc (N); | |
1494 | Stm_Entity : constant Entity_Id := | |
1495 | New_Internal_Entity | |
1496 | (E_Return_Statement, Current_Scope, Loc, 'R'); | |
1497 | ||
1498 | -- Start of processing for Analyze_Return_Statement | |
1499 | ||
1500 | begin | |
1501 | Set_Return_Statement_Entity (N, Stm_Entity); | |
1502 | ||
1503 | Set_Etype (Stm_Entity, Standard_Void_Type); | |
1504 | Set_Return_Applies_To (Stm_Entity, Scope_Id); | |
1505 | ||
1506 | -- Place Return entity on scope stack, to simplify enforcement of 6.5 | |
1507 | -- (4/2): an inner return statement will apply to this extended return. | |
1508 | ||
1509 | if Nkind (N) = N_Extended_Return_Statement then | |
1510 | Push_Scope (Stm_Entity); | |
1511 | end if; | |
1512 | ||
1513 | -- Check that pragma No_Return is obeyed. Don't complain about the | |
1514 | -- implicitly-generated return that is placed at the end. | |
1515 | ||
1516 | if No_Return (Scope_Id) and then Comes_From_Source (N) then | |
1517 | Error_Msg_N ("RETURN statement not allowed (No_Return)", N); | |
1518 | end if; | |
1519 | ||
1520 | -- Warn on any unassigned OUT parameters if in procedure | |
1521 | ||
1522 | if Ekind (Scope_Id) = E_Procedure then | |
1523 | Warn_On_Unassigned_Out_Parameter (N, Scope_Id); | |
1524 | end if; | |
1525 | ||
1526 | -- Check that functions return objects, and other things do not | |
1527 | ||
1528 | if Kind = E_Function or else Kind = E_Generic_Function then | |
1529 | if not Returns_Object then | |
1530 | Error_Msg_N ("missing expression in return from function", N); | |
1531 | end if; | |
1532 | ||
1533 | elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then | |
1534 | if Returns_Object then | |
1535 | Error_Msg_N ("procedure cannot return value (use function)", N); | |
1536 | end if; | |
1537 | ||
1538 | elsif Kind = E_Entry or else Kind = E_Entry_Family then | |
1539 | if Returns_Object then | |
1540 | if Is_Protected_Type (Scope (Scope_Id)) then | |
1541 | Error_Msg_N ("entry body cannot return value", N); | |
1542 | else | |
1543 | Error_Msg_N ("accept statement cannot return value", N); | |
1544 | end if; | |
1545 | end if; | |
1546 | ||
1547 | elsif Kind = E_Return_Statement then | |
1548 | ||
1549 | -- We are nested within another return statement, which must be an | |
1550 | -- extended_return_statement. | |
1551 | ||
1552 | if Returns_Object then | |
d0dcb2b1 AC |
1553 | if Nkind (N) = N_Extended_Return_Statement then |
1554 | Error_Msg_N | |
cc96a1b8 | 1555 | ("extended return statement cannot be nested (use `RETURN;`)", |
d0dcb2b1 AC |
1556 | N); |
1557 | ||
1558 | -- Case of a simple return statement with a value inside extended | |
1559 | -- return statement. | |
1560 | ||
1561 | else | |
1562 | Error_Msg_N | |
1563 | ("return nested in extended return statement cannot return " & | |
cc96a1b8 | 1564 | "value (use `RETURN;`)", N); |
d0dcb2b1 | 1565 | end if; |
b0186f71 AC |
1566 | end if; |
1567 | ||
1568 | else | |
1569 | Error_Msg_N ("illegal context for return statement", N); | |
1570 | end if; | |
1571 | ||
1572 | if Ekind_In (Kind, E_Function, E_Generic_Function) then | |
1573 | Analyze_Function_Return (N); | |
1574 | ||
1575 | elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then | |
1576 | Set_Return_Present (Scope_Id); | |
1577 | end if; | |
1578 | ||
1579 | if Nkind (N) = N_Extended_Return_Statement then | |
1580 | End_Scope; | |
1581 | end if; | |
1582 | ||
1583 | Kill_Current_Values (Last_Assignment_Only => True); | |
1584 | Check_Unreachable_Code (N); | |
dec6faf1 AC |
1585 | |
1586 | Analyze_Dimension (N); | |
b0186f71 AC |
1587 | end Analyze_Return_Statement; |
1588 | ||
5d37ba92 ES |
1589 | ------------------------------------- |
1590 | -- Analyze_Simple_Return_Statement -- | |
1591 | ------------------------------------- | |
ec4867fa | 1592 | |
5d37ba92 | 1593 | procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
996ae0b0 | 1594 | begin |
5d37ba92 ES |
1595 | if Present (Expression (N)) then |
1596 | Mark_Coextensions (N, Expression (N)); | |
996ae0b0 RK |
1597 | end if; |
1598 | ||
5d37ba92 ES |
1599 | Analyze_Return_Statement (N); |
1600 | end Analyze_Simple_Return_Statement; | |
996ae0b0 | 1601 | |
82c80734 RD |
1602 | ------------------------- |
1603 | -- Analyze_Return_Type -- | |
1604 | ------------------------- | |
1605 | ||
1606 | procedure Analyze_Return_Type (N : Node_Id) is | |
1607 | Designator : constant Entity_Id := Defining_Entity (N); | |
1608 | Typ : Entity_Id := Empty; | |
1609 | ||
1610 | begin | |
ec4867fa ES |
1611 | -- Normal case where result definition does not indicate an error |
1612 | ||
41251c60 JM |
1613 | if Result_Definition (N) /= Error then |
1614 | if Nkind (Result_Definition (N)) = N_Access_Definition then | |
2ba431e5 | 1615 | Check_SPARK_Restriction |
fe5d3068 | 1616 | ("access result is not allowed", Result_Definition (N)); |
daec8eeb | 1617 | |
b1c11e0e JM |
1618 | -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
1619 | ||
1620 | declare | |
1621 | AD : constant Node_Id := | |
1622 | Access_To_Subprogram_Definition (Result_Definition (N)); | |
1623 | begin | |
1624 | if Present (AD) and then Protected_Present (AD) then | |
1625 | Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); | |
1626 | else | |
1627 | Typ := Access_Definition (N, Result_Definition (N)); | |
1628 | end if; | |
1629 | end; | |
1630 | ||
41251c60 JM |
1631 | Set_Parent (Typ, Result_Definition (N)); |
1632 | Set_Is_Local_Anonymous_Access (Typ); | |
1633 | Set_Etype (Designator, Typ); | |
1634 | ||
b66c3ff4 AC |
1635 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1636 | ||
1637 | Null_Exclusion_Static_Checks (N); | |
1638 | ||
41251c60 JM |
1639 | -- Subtype_Mark case |
1640 | ||
1641 | else | |
1642 | Find_Type (Result_Definition (N)); | |
1643 | Typ := Entity (Result_Definition (N)); | |
1644 | Set_Etype (Designator, Typ); | |
1645 | ||
2ba431e5 | 1646 | -- Unconstrained array as result is not allowed in SPARK |
daec8eeb | 1647 | |
fe5d3068 | 1648 | if Is_Array_Type (Typ) |
daec8eeb YM |
1649 | and then not Is_Constrained (Typ) |
1650 | then | |
2ba431e5 | 1651 | Check_SPARK_Restriction |
fe5d3068 | 1652 | ("returning an unconstrained array is not allowed", |
7394c8cc | 1653 | Result_Definition (N)); |
daec8eeb YM |
1654 | end if; |
1655 | ||
b66c3ff4 AC |
1656 | -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
1657 | ||
1658 | Null_Exclusion_Static_Checks (N); | |
1659 | ||
1660 | -- If a null exclusion is imposed on the result type, then create | |
1661 | -- a null-excluding itype (an access subtype) and use it as the | |
1662 | -- function's Etype. Note that the null exclusion checks are done | |
1663 | -- right before this, because they don't get applied to types that | |
1664 | -- do not come from source. | |
1665 | ||
1666 | if Is_Access_Type (Typ) | |
1667 | and then Null_Exclusion_Present (N) | |
1668 | then | |
1669 | Set_Etype (Designator, | |
1670 | Create_Null_Excluding_Itype | |
ff7139c3 AC |
1671 | (T => Typ, |
1672 | Related_Nod => N, | |
1673 | Scope_Id => Scope (Current_Scope))); | |
1674 | ||
1675 | -- The new subtype must be elaborated before use because | |
1676 | -- it is visible outside of the function. However its base | |
1677 | -- type may not be frozen yet, so the reference that will | |
1678 | -- force elaboration must be attached to the freezing of | |
1679 | -- the base type. | |
1680 | ||
212863c0 AC |
1681 | -- If the return specification appears on a proper body, |
1682 | -- the subtype will have been created already on the spec. | |
1683 | ||
ff7139c3 | 1684 | if Is_Frozen (Typ) then |
212863c0 AC |
1685 | if Nkind (Parent (N)) = N_Subprogram_Body |
1686 | and then Nkind (Parent (Parent (N))) = N_Subunit | |
1687 | then | |
1688 | null; | |
1689 | else | |
1690 | Build_Itype_Reference (Etype (Designator), Parent (N)); | |
1691 | end if; | |
1692 | ||
ff7139c3 AC |
1693 | else |
1694 | Ensure_Freeze_Node (Typ); | |
1695 | ||
1696 | declare | |
212863c0 | 1697 | IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
ff7139c3 AC |
1698 | begin |
1699 | Set_Itype (IR, Etype (Designator)); | |
1700 | Append_Freeze_Actions (Typ, New_List (IR)); | |
1701 | end; | |
1702 | end if; | |
1703 | ||
b66c3ff4 AC |
1704 | else |
1705 | Set_Etype (Designator, Typ); | |
1706 | end if; | |
1707 | ||
41251c60 | 1708 | if Ekind (Typ) = E_Incomplete_Type |
0a36105d JM |
1709 | and then Is_Value_Type (Typ) |
1710 | then | |
1711 | null; | |
1712 | ||
1713 | elsif Ekind (Typ) = E_Incomplete_Type | |
41251c60 JM |
1714 | or else (Is_Class_Wide_Type (Typ) |
1715 | and then | |
1716 | Ekind (Root_Type (Typ)) = E_Incomplete_Type) | |
1717 | then | |
dd386db0 AC |
1718 | -- AI05-0151: Tagged incomplete types are allowed in all formal |
1719 | -- parts. Untagged incomplete types are not allowed in bodies. | |
1720 | ||
1721 | if Ada_Version >= Ada_2012 then | |
1722 | if Is_Tagged_Type (Typ) then | |
1723 | null; | |
1724 | ||
1725 | elsif Nkind_In (Parent (Parent (N)), | |
1726 | N_Accept_Statement, | |
1727 | N_Entry_Body, | |
1728 | N_Subprogram_Body) | |
1729 | then | |
1730 | Error_Msg_NE | |
1731 | ("invalid use of untagged incomplete type&", | |
1732 | Designator, Typ); | |
1733 | end if; | |
1734 | ||
63be2a5a AC |
1735 | -- The type must be completed in the current package. This |
1736 | -- is checked at the end of the package declaraton, when | |
7b7a0c2b AC |
1737 | -- Taft-amendment types are identified. If the return type |
1738 | -- is class-wide, there is no required check, the type can | |
1739 | -- be a bona fide TAT. | |
63be2a5a AC |
1740 | |
1741 | if Ekind (Scope (Current_Scope)) = E_Package | |
c199ccf7 | 1742 | and then In_Private_Part (Scope (Current_Scope)) |
7b7a0c2b | 1743 | and then not Is_Class_Wide_Type (Typ) |
63be2a5a AC |
1744 | then |
1745 | Append_Elmt (Designator, Private_Dependents (Typ)); | |
1746 | end if; | |
1747 | ||
dd386db0 AC |
1748 | else |
1749 | Error_Msg_NE | |
1750 | ("invalid use of incomplete type&", Designator, Typ); | |
1751 | end if; | |
41251c60 | 1752 | end if; |
82c80734 RD |
1753 | end if; |
1754 | ||
ec4867fa ES |
1755 | -- Case where result definition does indicate an error |
1756 | ||
82c80734 RD |
1757 | else |
1758 | Set_Etype (Designator, Any_Type); | |
1759 | end if; | |
1760 | end Analyze_Return_Type; | |
1761 | ||
996ae0b0 RK |
1762 | ----------------------------- |
1763 | -- Analyze_Subprogram_Body -- | |
1764 | ----------------------------- | |
1765 | ||
b1b543d2 BD |
1766 | procedure Analyze_Subprogram_Body (N : Node_Id) is |
1767 | Loc : constant Source_Ptr := Sloc (N); | |
1768 | Body_Spec : constant Node_Id := Specification (N); | |
1769 | Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); | |
1770 | ||
1771 | begin | |
1772 | if Debug_Flag_C then | |
1773 | Write_Str ("==> subprogram body "); | |
1774 | Write_Name (Chars (Body_Id)); | |
1775 | Write_Str (" from "); | |
1776 | Write_Location (Loc); | |
1777 | Write_Eol; | |
1778 | Indent; | |
1779 | end if; | |
1780 | ||
1781 | Trace_Scope (N, Body_Id, " Analyze subprogram: "); | |
1782 | ||
1783 | -- The real work is split out into the helper, so it can do "return;" | |
1784 | -- without skipping the debug output: | |
1785 | ||
1786 | Analyze_Subprogram_Body_Helper (N); | |
1787 | ||
1788 | if Debug_Flag_C then | |
1789 | Outdent; | |
1790 | Write_Str ("<== subprogram body "); | |
1791 | Write_Name (Chars (Body_Id)); | |
1792 | Write_Str (" from "); | |
1793 | Write_Location (Loc); | |
1794 | Write_Eol; | |
1795 | end if; | |
1796 | end Analyze_Subprogram_Body; | |
1797 | ||
1798 | ------------------------------------ | |
1799 | -- Analyze_Subprogram_Body_Helper -- | |
1800 | ------------------------------------ | |
1801 | ||
996ae0b0 RK |
1802 | -- This procedure is called for regular subprogram bodies, generic bodies, |
1803 | -- and for subprogram stubs of both kinds. In the case of stubs, only the | |
1804 | -- specification matters, and is used to create a proper declaration for | |
1805 | -- the subprogram, or to perform conformance checks. | |
1806 | ||
b1b543d2 | 1807 | procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
fbf5a39b | 1808 | Loc : constant Source_Ptr := Sloc (N); |
33931112 | 1809 | Body_Deleted : constant Boolean := False; |
fbf5a39b AC |
1810 | Body_Spec : constant Node_Id := Specification (N); |
1811 | Body_Id : Entity_Id := Defining_Entity (Body_Spec); | |
1812 | Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); | |
0868e09c | 1813 | Conformant : Boolean; |
21d27997 | 1814 | HSS : Node_Id; |
07fc65c4 | 1815 | P_Ent : Entity_Id; |
21d27997 RD |
1816 | Prot_Typ : Entity_Id := Empty; |
1817 | Spec_Id : Entity_Id; | |
1818 | Spec_Decl : Node_Id := Empty; | |
1819 | ||
1820 | Last_Real_Spec_Entity : Entity_Id := Empty; | |
1821 | -- When we analyze a separate spec, the entity chain ends up containing | |
1822 | -- the formals, as well as any itypes generated during analysis of the | |
1823 | -- default expressions for parameters, or the arguments of associated | |
1824 | -- precondition/postcondition pragmas (which are analyzed in the context | |
1825 | -- of the spec since they have visibility on formals). | |
1826 | -- | |
1827 | -- These entities belong with the spec and not the body. However we do | |
1828 | -- the analysis of the body in the context of the spec (again to obtain | |
1829 | -- visibility to the formals), and all the entities generated during | |
1830 | -- this analysis end up also chained to the entity chain of the spec. | |
1831 | -- But they really belong to the body, and there is circuitry to move | |
1832 | -- them from the spec to the body. | |
1833 | -- | |
1834 | -- However, when we do this move, we don't want to move the real spec | |
1835 | -- entities (first para above) to the body. The Last_Real_Spec_Entity | |
1836 | -- variable points to the last real spec entity, so we only move those | |
1837 | -- chained beyond that point. It is initialized to Empty to deal with | |
1838 | -- the case where there is no separate spec. | |
996ae0b0 | 1839 | |
ec4867fa | 1840 | procedure Check_Anonymous_Return; |
e50e1c5e | 1841 | -- Ada 2005: if a function returns an access type that denotes a task, |
ec4867fa ES |
1842 | -- or a type that contains tasks, we must create a master entity for |
1843 | -- the anonymous type, which typically will be used in an allocator | |
1844 | -- in the body of the function. | |
1845 | ||
e660dbf7 JM |
1846 | procedure Check_Inline_Pragma (Spec : in out Node_Id); |
1847 | -- Look ahead to recognize a pragma that may appear after the body. | |
1848 | -- If there is a previous spec, check that it appears in the same | |
1849 | -- declarative part. If the pragma is Inline_Always, perform inlining | |
1850 | -- unconditionally, otherwise only if Front_End_Inlining is requested. | |
1851 | -- If the body acts as a spec, and inlining is required, we create a | |
1852 | -- subprogram declaration for it, in order to attach the body to inline. | |
21d27997 RD |
1853 | -- If pragma does not appear after the body, check whether there is |
1854 | -- an inline pragma before any local declarations. | |
c37bb106 | 1855 | |
7665e4bd AC |
1856 | procedure Check_Missing_Return; |
1857 | -- Checks for a function with a no return statements, and also performs | |
8d606a78 RD |
1858 | -- the warning checks implemented by Check_Returns. In formal mode, also |
1859 | -- verify that a function ends with a RETURN and that a procedure does | |
1860 | -- not contain any RETURN. | |
7665e4bd | 1861 | |
d44202ba HK |
1862 | function Disambiguate_Spec return Entity_Id; |
1863 | -- When a primitive is declared between the private view and the full | |
1864 | -- view of a concurrent type which implements an interface, a special | |
1865 | -- mechanism is used to find the corresponding spec of the primitive | |
1866 | -- body. | |
1867 | ||
5dcab3ca AC |
1868 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id); |
1869 | -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains | |
1870 | -- incomplete types coming from a limited context and swap their limited | |
1871 | -- views with the non-limited ones. | |
1872 | ||
d44202ba HK |
1873 | function Is_Private_Concurrent_Primitive |
1874 | (Subp_Id : Entity_Id) return Boolean; | |
1875 | -- Determine whether subprogram Subp_Id is a primitive of a concurrent | |
1876 | -- type that implements an interface and has a private view. | |
1877 | ||
76a69663 ES |
1878 | procedure Set_Trivial_Subprogram (N : Node_Id); |
1879 | -- Sets the Is_Trivial_Subprogram flag in both spec and body of the | |
1880 | -- subprogram whose body is being analyzed. N is the statement node | |
1881 | -- causing the flag to be set, if the following statement is a return | |
1882 | -- of an entity, we mark the entity as set in source to suppress any | |
1883 | -- warning on the stylized use of function stubs with a dummy return. | |
1884 | ||
758c442c GD |
1885 | procedure Verify_Overriding_Indicator; |
1886 | -- If there was a previous spec, the entity has been entered in the | |
1887 | -- current scope previously. If the body itself carries an overriding | |
1888 | -- indicator, check that it is consistent with the known status of the | |
1889 | -- entity. | |
1890 | ||
ec4867fa ES |
1891 | ---------------------------- |
1892 | -- Check_Anonymous_Return -- | |
1893 | ---------------------------- | |
1894 | ||
1895 | procedure Check_Anonymous_Return is | |
1896 | Decl : Node_Id; | |
a523b302 | 1897 | Par : Node_Id; |
ec4867fa ES |
1898 | Scop : Entity_Id; |
1899 | ||
1900 | begin | |
1901 | if Present (Spec_Id) then | |
1902 | Scop := Spec_Id; | |
1903 | else | |
1904 | Scop := Body_Id; | |
1905 | end if; | |
1906 | ||
1907 | if Ekind (Scop) = E_Function | |
1908 | and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type | |
a523b302 JM |
1909 | and then not Is_Thunk (Scop) |
1910 | and then (Has_Task (Designated_Type (Etype (Scop))) | |
1911 | or else | |
1912 | (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) | |
1913 | and then | |
1914 | Is_Limited_Record (Designated_Type (Etype (Scop))))) | |
ec4867fa | 1915 | and then Expander_Active |
b20de9b9 AC |
1916 | |
1917 | -- Avoid cases with no tasking support | |
1918 | ||
1919 | and then RTE_Available (RE_Current_Master) | |
1920 | and then not Restriction_Active (No_Task_Hierarchy) | |
ec4867fa ES |
1921 | then |
1922 | Decl := | |
1923 | Make_Object_Declaration (Loc, | |
1924 | Defining_Identifier => | |
1925 | Make_Defining_Identifier (Loc, Name_uMaster), | |
1926 | Constant_Present => True, | |
1927 | Object_Definition => | |
1928 | New_Reference_To (RTE (RE_Master_Id), Loc), | |
1929 | Expression => | |
1930 | Make_Explicit_Dereference (Loc, | |
1931 | New_Reference_To (RTE (RE_Current_Master), Loc))); | |
1932 | ||
1933 | if Present (Declarations (N)) then | |
1934 | Prepend (Decl, Declarations (N)); | |
1935 | else | |
1936 | Set_Declarations (N, New_List (Decl)); | |
1937 | end if; | |
1938 | ||
1939 | Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); | |
1940 | Set_Has_Master_Entity (Scop); | |
a523b302 JM |
1941 | |
1942 | -- Now mark the containing scope as a task master | |
1943 | ||
1944 | Par := N; | |
1945 | while Nkind (Par) /= N_Compilation_Unit loop | |
1946 | Par := Parent (Par); | |
1947 | pragma Assert (Present (Par)); | |
1948 | ||
1949 | -- If we fall off the top, we are at the outer level, and | |
1950 | -- the environment task is our effective master, so nothing | |
1951 | -- to mark. | |
1952 | ||
1953 | if Nkind_In | |
1954 | (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) | |
1955 | then | |
1956 | Set_Is_Task_Master (Par, True); | |
1957 | exit; | |
1958 | end if; | |
1959 | end loop; | |
ec4867fa ES |
1960 | end if; |
1961 | end Check_Anonymous_Return; | |
1962 | ||
e660dbf7 JM |
1963 | ------------------------- |
1964 | -- Check_Inline_Pragma -- | |
1965 | ------------------------- | |
758c442c | 1966 | |
e660dbf7 JM |
1967 | procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
1968 | Prag : Node_Id; | |
1969 | Plist : List_Id; | |
0fb2ea01 | 1970 | |
21d27997 | 1971 | function Is_Inline_Pragma (N : Node_Id) return Boolean; |
30783513 | 1972 | -- True when N is a pragma Inline or Inline_Always that applies |
33931112 | 1973 | -- to this subprogram. |
21d27997 RD |
1974 | |
1975 | ----------------------- | |
1976 | -- Is_Inline_Pragma -- | |
1977 | ----------------------- | |
1978 | ||
1979 | function Is_Inline_Pragma (N : Node_Id) return Boolean is | |
1980 | begin | |
1981 | return | |
1982 | Nkind (N) = N_Pragma | |
1983 | and then | |
1984 | (Pragma_Name (N) = Name_Inline_Always | |
1985 | or else | |
1986 | (Front_End_Inlining | |
1987 | and then Pragma_Name (N) = Name_Inline)) | |
1988 | and then | |
1989 | Chars | |
1990 | (Expression (First (Pragma_Argument_Associations (N)))) | |
1991 | = Chars (Body_Id); | |
1992 | end Is_Inline_Pragma; | |
1993 | ||
1994 | -- Start of processing for Check_Inline_Pragma | |
1995 | ||
c37bb106 | 1996 | begin |
e660dbf7 JM |
1997 | if not Expander_Active then |
1998 | return; | |
1999 | end if; | |
2000 | ||
2001 | if Is_List_Member (N) | |
2002 | and then Present (Next (N)) | |
21d27997 | 2003 | and then Is_Inline_Pragma (Next (N)) |
c37bb106 AC |
2004 | then |
2005 | Prag := Next (N); | |
2006 | ||
21d27997 RD |
2007 | elsif Nkind (N) /= N_Subprogram_Body_Stub |
2008 | and then Present (Declarations (N)) | |
2009 | and then Is_Inline_Pragma (First (Declarations (N))) | |
2010 | then | |
2011 | Prag := First (Declarations (N)); | |
2012 | ||
e660dbf7 JM |
2013 | else |
2014 | Prag := Empty; | |
c37bb106 | 2015 | end if; |
e660dbf7 JM |
2016 | |
2017 | if Present (Prag) then | |
2018 | if Present (Spec_Id) then | |
30196a76 | 2019 | if In_Same_List (N, Unit_Declaration_Node (Spec_Id)) then |
e660dbf7 JM |
2020 | Analyze (Prag); |
2021 | end if; | |
2022 | ||
2023 | else | |
d39d6bb8 | 2024 | -- Create a subprogram declaration, to make treatment uniform |
e660dbf7 JM |
2025 | |
2026 | declare | |
2027 | Subp : constant Entity_Id := | |
30196a76 | 2028 | Make_Defining_Identifier (Loc, Chars (Body_Id)); |
e660dbf7 | 2029 | Decl : constant Node_Id := |
30196a76 RD |
2030 | Make_Subprogram_Declaration (Loc, |
2031 | Specification => | |
2032 | New_Copy_Tree (Specification (N))); | |
2033 | ||
e660dbf7 JM |
2034 | begin |
2035 | Set_Defining_Unit_Name (Specification (Decl), Subp); | |
2036 | ||
2037 | if Present (First_Formal (Body_Id)) then | |
21d27997 | 2038 | Plist := Copy_Parameter_List (Body_Id); |
e660dbf7 JM |
2039 | Set_Parameter_Specifications |
2040 | (Specification (Decl), Plist); | |
2041 | end if; | |
2042 | ||
2043 | Insert_Before (N, Decl); | |
2044 | Analyze (Decl); | |
2045 | Analyze (Prag); | |
2046 | Set_Has_Pragma_Inline (Subp); | |
2047 | ||
76a69663 | 2048 | if Pragma_Name (Prag) = Name_Inline_Always then |
e660dbf7 | 2049 | Set_Is_Inlined (Subp); |
21d27997 | 2050 | Set_Has_Pragma_Inline_Always (Subp); |
e660dbf7 JM |
2051 | end if; |
2052 | ||
2053 | Spec := Subp; | |
2054 | end; | |
2055 | end if; | |
2056 | end if; | |
2057 | end Check_Inline_Pragma; | |
2058 | ||
7665e4bd AC |
2059 | -------------------------- |
2060 | -- Check_Missing_Return -- | |
2061 | -------------------------- | |
2062 | ||
2063 | procedure Check_Missing_Return is | |
2064 | Id : Entity_Id; | |
2065 | Missing_Ret : Boolean; | |
2066 | ||
2067 | begin | |
2068 | if Nkind (Body_Spec) = N_Function_Specification then | |
2069 | if Present (Spec_Id) then | |
2070 | Id := Spec_Id; | |
2071 | else | |
2072 | Id := Body_Id; | |
2073 | end if; | |
2074 | ||
fe5d3068 | 2075 | if Return_Present (Id) then |
7665e4bd AC |
2076 | Check_Returns (HSS, 'F', Missing_Ret); |
2077 | ||
2078 | if Missing_Ret then | |
2079 | Set_Has_Missing_Return (Id); | |
2080 | end if; | |
2081 | ||
2082 | elsif (Is_Generic_Subprogram (Id) | |
2083 | or else not Is_Machine_Code_Subprogram (Id)) | |
2084 | and then not Body_Deleted | |
2085 | then | |
2086 | Error_Msg_N ("missing RETURN statement in function body", N); | |
2087 | end if; | |
2088 | ||
fe5d3068 | 2089 | -- If procedure with No_Return, check returns |
607d0635 | 2090 | |
fe5d3068 YM |
2091 | elsif Nkind (Body_Spec) = N_Procedure_Specification |
2092 | and then Present (Spec_Id) | |
2093 | and then No_Return (Spec_Id) | |
607d0635 | 2094 | then |
fe5d3068 YM |
2095 | Check_Returns (HSS, 'P', Missing_Ret, Spec_Id); |
2096 | end if; | |
2097 | ||
ad05f2e9 | 2098 | -- Special checks in SPARK mode |
fe5d3068 YM |
2099 | |
2100 | if Nkind (Body_Spec) = N_Function_Specification then | |
7394c8cc | 2101 | |
ad05f2e9 | 2102 | -- In SPARK mode, last statement of a function should be a return |
fe5d3068 YM |
2103 | |
2104 | declare | |
2105 | Stat : constant Node_Id := Last_Source_Statement (HSS); | |
2106 | begin | |
2107 | if Present (Stat) | |
7394c8cc AC |
2108 | and then not Nkind_In (Stat, N_Simple_Return_Statement, |
2109 | N_Extended_Return_Statement) | |
fe5d3068 | 2110 | then |
2ba431e5 | 2111 | Check_SPARK_Restriction |
fe5d3068 YM |
2112 | ("last statement in function should be RETURN", Stat); |
2113 | end if; | |
2114 | end; | |
2115 | ||
ad05f2e9 | 2116 | -- In SPARK mode, verify that a procedure has no return |
fe5d3068 YM |
2117 | |
2118 | elsif Nkind (Body_Spec) = N_Procedure_Specification then | |
607d0635 AC |
2119 | if Present (Spec_Id) then |
2120 | Id := Spec_Id; | |
2121 | else | |
2122 | Id := Body_Id; | |
2123 | end if; | |
2124 | ||
8d606a78 RD |
2125 | -- Would be nice to point to return statement here, can we |
2126 | -- borrow the Check_Returns procedure here ??? | |
2127 | ||
607d0635 | 2128 | if Return_Present (Id) then |
2ba431e5 | 2129 | Check_SPARK_Restriction |
fe5d3068 | 2130 | ("procedure should not have RETURN", N); |
607d0635 | 2131 | end if; |
7665e4bd AC |
2132 | end if; |
2133 | end Check_Missing_Return; | |
2134 | ||
d44202ba HK |
2135 | ----------------------- |
2136 | -- Disambiguate_Spec -- | |
2137 | ----------------------- | |
2138 | ||
2139 | function Disambiguate_Spec return Entity_Id is | |
2140 | Priv_Spec : Entity_Id; | |
2141 | Spec_N : Entity_Id; | |
2142 | ||
2143 | procedure Replace_Types (To_Corresponding : Boolean); | |
2144 | -- Depending on the flag, replace the type of formal parameters of | |
2145 | -- Body_Id if it is a concurrent type implementing interfaces with | |
2146 | -- the corresponding record type or the other way around. | |
2147 | ||
2148 | procedure Replace_Types (To_Corresponding : Boolean) is | |
2149 | Formal : Entity_Id; | |
2150 | Formal_Typ : Entity_Id; | |
2151 | ||
2152 | begin | |
2153 | Formal := First_Formal (Body_Id); | |
2154 | while Present (Formal) loop | |
2155 | Formal_Typ := Etype (Formal); | |
2156 | ||
df3e68b1 HK |
2157 | if Is_Class_Wide_Type (Formal_Typ) then |
2158 | Formal_Typ := Root_Type (Formal_Typ); | |
2159 | end if; | |
2160 | ||
d44202ba HK |
2161 | -- From concurrent type to corresponding record |
2162 | ||
2163 | if To_Corresponding then | |
2164 | if Is_Concurrent_Type (Formal_Typ) | |
2165 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
2166 | and then Present (Interfaces ( | |
2167 | Corresponding_Record_Type (Formal_Typ))) | |
2168 | then | |
2169 | Set_Etype (Formal, | |
2170 | Corresponding_Record_Type (Formal_Typ)); | |
2171 | end if; | |
2172 | ||
2173 | -- From corresponding record to concurrent type | |
2174 | ||
2175 | else | |
2176 | if Is_Concurrent_Record_Type (Formal_Typ) | |
2177 | and then Present (Interfaces (Formal_Typ)) | |
2178 | then | |
2179 | Set_Etype (Formal, | |
2180 | Corresponding_Concurrent_Type (Formal_Typ)); | |
2181 | end if; | |
2182 | end if; | |
2183 | ||
2184 | Next_Formal (Formal); | |
2185 | end loop; | |
2186 | end Replace_Types; | |
2187 | ||
2188 | -- Start of processing for Disambiguate_Spec | |
2189 | ||
2190 | begin | |
2191 | -- Try to retrieve the specification of the body as is. All error | |
2192 | -- messages are suppressed because the body may not have a spec in | |
2193 | -- its current state. | |
2194 | ||
2195 | Spec_N := Find_Corresponding_Spec (N, False); | |
2196 | ||
2197 | -- It is possible that this is the body of a primitive declared | |
2198 | -- between a private and a full view of a concurrent type. The | |
2199 | -- controlling parameter of the spec carries the concurrent type, | |
2200 | -- not the corresponding record type as transformed by Analyze_ | |
2201 | -- Subprogram_Specification. In such cases, we undo the change | |
2202 | -- made by the analysis of the specification and try to find the | |
2203 | -- spec again. | |
766d7add | 2204 | |
8198b93d HK |
2205 | -- Note that wrappers already have their corresponding specs and |
2206 | -- bodies set during their creation, so if the candidate spec is | |
16b05213 | 2207 | -- a wrapper, then we definitely need to swap all types to their |
8198b93d | 2208 | -- original concurrent status. |
d44202ba | 2209 | |
8198b93d HK |
2210 | if No (Spec_N) |
2211 | or else Is_Primitive_Wrapper (Spec_N) | |
2212 | then | |
d44202ba HK |
2213 | -- Restore all references of corresponding record types to the |
2214 | -- original concurrent types. | |
2215 | ||
2216 | Replace_Types (To_Corresponding => False); | |
2217 | Priv_Spec := Find_Corresponding_Spec (N, False); | |
2218 | ||
2219 | -- The current body truly belongs to a primitive declared between | |
2220 | -- a private and a full view. We leave the modified body as is, | |
2221 | -- and return the true spec. | |
2222 | ||
2223 | if Present (Priv_Spec) | |
2224 | and then Is_Private_Primitive (Priv_Spec) | |
2225 | then | |
2226 | return Priv_Spec; | |
2227 | end if; | |
2228 | ||
2229 | -- In case that this is some sort of error, restore the original | |
2230 | -- state of the body. | |
2231 | ||
2232 | Replace_Types (To_Corresponding => True); | |
2233 | end if; | |
2234 | ||
2235 | return Spec_N; | |
2236 | end Disambiguate_Spec; | |
2237 | ||
5dcab3ca AC |
2238 | ---------------------------- |
2239 | -- Exchange_Limited_Views -- | |
2240 | ---------------------------- | |
2241 | ||
2242 | procedure Exchange_Limited_Views (Subp_Id : Entity_Id) is | |
2243 | procedure Detect_And_Exchange (Id : Entity_Id); | |
2244 | -- Determine whether Id's type denotes an incomplete type associated | |
2245 | -- with a limited with clause and exchange the limited view with the | |
2246 | -- non-limited one. | |
2247 | ||
2248 | ------------------------- | |
2249 | -- Detect_And_Exchange -- | |
2250 | ------------------------- | |
2251 | ||
2252 | procedure Detect_And_Exchange (Id : Entity_Id) is | |
2253 | Typ : constant Entity_Id := Etype (Id); | |
2254 | ||
2255 | begin | |
2256 | if Ekind (Typ) = E_Incomplete_Type | |
2257 | and then From_With_Type (Typ) | |
2258 | and then Present (Non_Limited_View (Typ)) | |
2259 | then | |
2260 | Set_Etype (Id, Non_Limited_View (Typ)); | |
2261 | end if; | |
2262 | end Detect_And_Exchange; | |
2263 | ||
2264 | -- Local variables | |
2265 | ||
2266 | Formal : Entity_Id; | |
2267 | ||
2268 | -- Start of processing for Exchange_Limited_Views | |
2269 | ||
2270 | begin | |
2271 | if No (Subp_Id) then | |
2272 | return; | |
2273 | ||
2274 | -- Do not process subprogram bodies as they already use the non- | |
2275 | -- limited view of types. | |
2276 | ||
2277 | elsif not Ekind_In (Subp_Id, E_Function, E_Procedure) then | |
2278 | return; | |
2279 | end if; | |
2280 | ||
2281 | -- Examine all formals and swap views when applicable | |
2282 | ||
2283 | Formal := First_Formal (Subp_Id); | |
2284 | while Present (Formal) loop | |
2285 | Detect_And_Exchange (Formal); | |
2286 | ||
2287 | Next_Formal (Formal); | |
2288 | end loop; | |
2289 | ||
2290 | -- Process the return type of a function | |
2291 | ||
2292 | if Ekind (Subp_Id) = E_Function then | |
2293 | Detect_And_Exchange (Subp_Id); | |
2294 | end if; | |
2295 | end Exchange_Limited_Views; | |
2296 | ||
d44202ba HK |
2297 | ------------------------------------- |
2298 | -- Is_Private_Concurrent_Primitive -- | |
2299 | ------------------------------------- | |
2300 | ||
2301 | function Is_Private_Concurrent_Primitive | |
2302 | (Subp_Id : Entity_Id) return Boolean | |
2303 | is | |
2304 | Formal_Typ : Entity_Id; | |
2305 | ||
2306 | begin | |
2307 | if Present (First_Formal (Subp_Id)) then | |
2308 | Formal_Typ := Etype (First_Formal (Subp_Id)); | |
2309 | ||
2310 | if Is_Concurrent_Record_Type (Formal_Typ) then | |
df3e68b1 HK |
2311 | if Is_Class_Wide_Type (Formal_Typ) then |
2312 | Formal_Typ := Root_Type (Formal_Typ); | |
2313 | end if; | |
2314 | ||
d44202ba HK |
2315 | Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
2316 | end if; | |
2317 | ||
2318 | -- The type of the first formal is a concurrent tagged type with | |
2319 | -- a private view. | |
2320 | ||
2321 | return | |
2322 | Is_Concurrent_Type (Formal_Typ) | |
2323 | and then Is_Tagged_Type (Formal_Typ) | |
2324 | and then Has_Private_Declaration (Formal_Typ); | |
2325 | end if; | |
2326 | ||
2327 | return False; | |
2328 | end Is_Private_Concurrent_Primitive; | |
2329 | ||
76a69663 ES |
2330 | ---------------------------- |
2331 | -- Set_Trivial_Subprogram -- | |
2332 | ---------------------------- | |
2333 | ||
2334 | procedure Set_Trivial_Subprogram (N : Node_Id) is | |
2335 | Nxt : constant Node_Id := Next (N); | |
2336 | ||
2337 | begin | |
2338 | Set_Is_Trivial_Subprogram (Body_Id); | |
2339 | ||
2340 | if Present (Spec_Id) then | |
2341 | Set_Is_Trivial_Subprogram (Spec_Id); | |
2342 | end if; | |
2343 | ||
2344 | if Present (Nxt) | |
2345 | and then Nkind (Nxt) = N_Simple_Return_Statement | |
2346 | and then No (Next (Nxt)) | |
2347 | and then Present (Expression (Nxt)) | |
2348 | and then Is_Entity_Name (Expression (Nxt)) | |
2349 | then | |
2350 | Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); | |
2351 | end if; | |
2352 | end Set_Trivial_Subprogram; | |
2353 | ||
758c442c GD |
2354 | --------------------------------- |
2355 | -- Verify_Overriding_Indicator -- | |
2356 | --------------------------------- | |
2357 | ||
2358 | procedure Verify_Overriding_Indicator is | |
2359 | begin | |
21d27997 RD |
2360 | if Must_Override (Body_Spec) then |
2361 | if Nkind (Spec_Id) = N_Defining_Operator_Symbol | |
2362 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2363 | then | |
2364 | null; | |
2365 | ||
038140ed | 2366 | elsif not Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2367 | Error_Msg_NE |
21d27997 RD |
2368 | ("subprogram& is not overriding", Body_Spec, Spec_Id); |
2369 | end if; | |
758c442c | 2370 | |
5d37ba92 | 2371 | elsif Must_Not_Override (Body_Spec) then |
038140ed | 2372 | if Present (Overridden_Operation (Spec_Id)) then |
ed2233dc | 2373 | Error_Msg_NE |
5d37ba92 | 2374 | ("subprogram& overrides inherited operation", |
76a69663 | 2375 | Body_Spec, Spec_Id); |
5d37ba92 | 2376 | |
21d27997 RD |
2377 | elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
2378 | and then Operator_Matches_Spec (Spec_Id, Spec_Id) | |
2379 | then | |
ed2233dc | 2380 | Error_Msg_NE |
21d27997 RD |
2381 | ("subprogram & overrides predefined operator ", |
2382 | Body_Spec, Spec_Id); | |
2383 | ||
618fb570 AC |
2384 | -- If this is not a primitive operation or protected subprogram, |
2385 | -- then the overriding indicator is altogether illegal. | |
5d37ba92 | 2386 | |
618fb570 AC |
2387 | elsif not Is_Primitive (Spec_Id) |
2388 | and then Ekind (Scope (Spec_Id)) /= E_Protected_Type | |
2389 | then | |
ed2233dc | 2390 | Error_Msg_N |
19d846a0 RD |
2391 | ("overriding indicator only allowed " & |
2392 | "if subprogram is primitive", | |
2393 | Body_Spec); | |
5d37ba92 | 2394 | end if; |
235f4375 | 2395 | |
806f6d37 | 2396 | elsif Style_Check |
038140ed | 2397 | and then Present (Overridden_Operation (Spec_Id)) |
235f4375 AC |
2398 | then |
2399 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2400 | Style.Missing_Overriding (N, Body_Id); | |
806f6d37 AC |
2401 | |
2402 | elsif Style_Check | |
2403 | and then Can_Override_Operator (Spec_Id) | |
2404 | and then not Is_Predefined_File_Name | |
2405 | (Unit_File_Name (Get_Source_Unit (Spec_Id))) | |
2406 | then | |
2407 | pragma Assert (Unit_Declaration_Node (Body_Id) = N); | |
2408 | Style.Missing_Overriding (N, Body_Id); | |
758c442c GD |
2409 | end if; |
2410 | end Verify_Overriding_Indicator; | |
2411 | ||
b1b543d2 | 2412 | -- Start of processing for Analyze_Subprogram_Body_Helper |
0fb2ea01 | 2413 | |
996ae0b0 | 2414 | begin |
82c80734 RD |
2415 | -- Generic subprograms are handled separately. They always have a |
2416 | -- generic specification. Determine whether current scope has a | |
2417 | -- previous declaration. | |
996ae0b0 | 2418 | |
82c80734 RD |
2419 | -- If the subprogram body is defined within an instance of the same |
2420 | -- name, the instance appears as a package renaming, and will be hidden | |
2421 | -- within the subprogram. | |
996ae0b0 RK |
2422 | |
2423 | if Present (Prev_Id) | |
2424 | and then not Is_Overloadable (Prev_Id) | |
2425 | and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration | |
2426 | or else Comes_From_Source (Prev_Id)) | |
2427 | then | |
fbf5a39b | 2428 | if Is_Generic_Subprogram (Prev_Id) then |
996ae0b0 RK |
2429 | Spec_Id := Prev_Id; |
2430 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2431 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2432 | ||
2433 | Analyze_Generic_Subprogram_Body (N, Spec_Id); | |
7665e4bd AC |
2434 | |
2435 | if Nkind (N) = N_Subprogram_Body then | |
2436 | HSS := Handled_Statement_Sequence (N); | |
2437 | Check_Missing_Return; | |
2438 | end if; | |
2439 | ||
996ae0b0 RK |
2440 | return; |
2441 | ||
2442 | else | |
82c80734 RD |
2443 | -- Previous entity conflicts with subprogram name. Attempting to |
2444 | -- enter name will post error. | |
996ae0b0 RK |
2445 | |
2446 | Enter_Name (Body_Id); | |
2447 | return; | |
2448 | end if; | |
2449 | ||
82c80734 RD |
2450 | -- Non-generic case, find the subprogram declaration, if one was seen, |
2451 | -- or enter new overloaded entity in the current scope. If the | |
2452 | -- Current_Entity is the Body_Id itself, the unit is being analyzed as | |
2453 | -- part of the context of one of its subunits. No need to redo the | |
2454 | -- analysis. | |
996ae0b0 RK |
2455 | |
2456 | elsif Prev_Id = Body_Id | |
2457 | and then Has_Completion (Body_Id) | |
2458 | then | |
2459 | return; | |
2460 | ||
2461 | else | |
fbf5a39b | 2462 | Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
996ae0b0 RK |
2463 | |
2464 | if Nkind (N) = N_Subprogram_Body_Stub | |
2465 | or else No (Corresponding_Spec (N)) | |
2466 | then | |
d44202ba HK |
2467 | if Is_Private_Concurrent_Primitive (Body_Id) then |
2468 | Spec_Id := Disambiguate_Spec; | |
2469 | else | |
2470 | Spec_Id := Find_Corresponding_Spec (N); | |
2471 | end if; | |
996ae0b0 RK |
2472 | |
2473 | -- If this is a duplicate body, no point in analyzing it | |
2474 | ||
2475 | if Error_Posted (N) then | |
2476 | return; | |
2477 | end if; | |
2478 | ||
82c80734 RD |
2479 | -- A subprogram body should cause freezing of its own declaration, |
2480 | -- but if there was no previous explicit declaration, then the | |
2481 | -- subprogram will get frozen too late (there may be code within | |
2482 | -- the body that depends on the subprogram having been frozen, | |
2483 | -- such as uses of extra formals), so we force it to be frozen | |
76a69663 | 2484 | -- here. Same holds if the body and spec are compilation units. |
cd1c668b ES |
2485 | -- Finally, if the return type is an anonymous access to protected |
2486 | -- subprogram, it must be frozen before the body because its | |
2487 | -- expansion has generated an equivalent type that is used when | |
2488 | -- elaborating the body. | |
996ae0b0 | 2489 | |
885c4871 | 2490 | -- An exception in the case of Ada 2012, AI05-177: The bodies |
ebb6faaa AC |
2491 | -- created for expression functions do not freeze. |
2492 | ||
2493 | if No (Spec_Id) | |
2494 | and then Nkind (Original_Node (N)) /= N_Expression_Function | |
2495 | then | |
996ae0b0 RK |
2496 | Freeze_Before (N, Body_Id); |
2497 | ||
2498 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
2499 | Freeze_Before (N, Spec_Id); | |
cd1c668b ES |
2500 | |
2501 | elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then | |
2502 | Freeze_Before (N, Etype (Body_Id)); | |
996ae0b0 | 2503 | end if; |
a38ff9b1 | 2504 | |
996ae0b0 RK |
2505 | else |
2506 | Spec_Id := Corresponding_Spec (N); | |
2507 | end if; | |
2508 | end if; | |
2509 | ||
82c80734 RD |
2510 | -- Do not inline any subprogram that contains nested subprograms, since |
2511 | -- the backend inlining circuit seems to generate uninitialized | |
07fc65c4 | 2512 | -- references in this case. We know this happens in the case of front |
82c80734 RD |
2513 | -- end ZCX support, but it also appears it can happen in other cases as |
2514 | -- well. The backend often rejects attempts to inline in the case of | |
2515 | -- nested procedures anyway, so little if anything is lost by this. | |
2516 | -- Note that this is test is for the benefit of the back-end. There is | |
2517 | -- a separate test for front-end inlining that also rejects nested | |
2518 | -- subprograms. | |
07fc65c4 GB |
2519 | |
2520 | -- Do not do this test if errors have been detected, because in some | |
2521 | -- error cases, this code blows up, and we don't need it anyway if | |
2522 | -- there have been errors, since we won't get to the linker anyway. | |
2523 | ||
82c80734 RD |
2524 | if Comes_From_Source (Body_Id) |
2525 | and then Serious_Errors_Detected = 0 | |
84f4072a | 2526 | and then not Debug_Flag_Dot_K |
82c80734 | 2527 | then |
07fc65c4 GB |
2528 | P_Ent := Body_Id; |
2529 | loop | |
2530 | P_Ent := Scope (P_Ent); | |
2531 | exit when No (P_Ent) or else P_Ent = Standard_Standard; | |
2532 | ||
fbf5a39b | 2533 | if Is_Subprogram (P_Ent) then |
07fc65c4 GB |
2534 | Set_Is_Inlined (P_Ent, False); |
2535 | ||
2536 | if Comes_From_Source (P_Ent) | |
07fc65c4 GB |
2537 | and then Has_Pragma_Inline (P_Ent) |
2538 | then | |
fbf5a39b AC |
2539 | Cannot_Inline |
2540 | ("cannot inline& (nested subprogram)?", | |
2541 | N, P_Ent); | |
07fc65c4 GB |
2542 | end if; |
2543 | end if; | |
2544 | end loop; | |
2545 | end if; | |
2546 | ||
84f4072a JM |
2547 | -- Look ahead to recognize a pragma inline that appears after the body |
2548 | ||
e660dbf7 JM |
2549 | Check_Inline_Pragma (Spec_Id); |
2550 | ||
701b7fbb RD |
2551 | -- Deal with special case of a fully private operation in the body of |
2552 | -- the protected type. We must create a declaration for the subprogram, | |
2553 | -- in order to attach the protected subprogram that will be used in | |
2554 | -- internal calls. We exclude compiler generated bodies from the | |
2555 | -- expander since the issue does not arise for those cases. | |
07fc65c4 | 2556 | |
996ae0b0 RK |
2557 | if No (Spec_Id) |
2558 | and then Comes_From_Source (N) | |
2559 | and then Is_Protected_Type (Current_Scope) | |
2560 | then | |
47bfea3a | 2561 | Spec_Id := Build_Private_Protected_Declaration (N); |
701b7fbb | 2562 | end if; |
996ae0b0 | 2563 | |
5334d18f | 2564 | -- If a separate spec is present, then deal with freezing issues |
7ca78bba | 2565 | |
701b7fbb | 2566 | if Present (Spec_Id) then |
996ae0b0 | 2567 | Spec_Decl := Unit_Declaration_Node (Spec_Id); |
758c442c | 2568 | Verify_Overriding_Indicator; |
5d37ba92 ES |
2569 | |
2570 | -- In general, the spec will be frozen when we start analyzing the | |
2571 | -- body. However, for internally generated operations, such as | |
2572 | -- wrapper functions for inherited operations with controlling | |
164e06c6 AC |
2573 | -- results, the spec may not have been frozen by the time we expand |
2574 | -- the freeze actions that include the bodies. In particular, extra | |
2575 | -- formals for accessibility or for return-in-place may need to be | |
2576 | -- generated. Freeze nodes, if any, are inserted before the current | |
2577 | -- body. These freeze actions are also needed in ASIS mode to enable | |
2578 | -- the proper back-annotations. | |
5d37ba92 ES |
2579 | |
2580 | if not Is_Frozen (Spec_Id) | |
7134062a | 2581 | and then (Expander_Active or ASIS_Mode) |
5d37ba92 ES |
2582 | then |
2583 | -- Force the generation of its freezing node to ensure proper | |
2584 | -- management of access types in the backend. | |
2585 | ||
2586 | -- This is definitely needed for some cases, but it is not clear | |
2587 | -- why, to be investigated further??? | |
2588 | ||
2589 | Set_Has_Delayed_Freeze (Spec_Id); | |
6b958cec | 2590 | Freeze_Before (N, Spec_Id); |
5d37ba92 | 2591 | end if; |
996ae0b0 RK |
2592 | end if; |
2593 | ||
a5d83d61 AC |
2594 | -- Mark presence of postcondition procedure in current scope and mark |
2595 | -- the procedure itself as needing debug info. The latter is important | |
2596 | -- when analyzing decision coverage (for example, for MC/DC coverage). | |
7ca78bba | 2597 | |
0dabde3a ES |
2598 | if Chars (Body_Id) = Name_uPostconditions then |
2599 | Set_Has_Postconditions (Current_Scope); | |
a5d83d61 | 2600 | Set_Debug_Info_Needed (Body_Id); |
0dabde3a ES |
2601 | end if; |
2602 | ||
996ae0b0 RK |
2603 | -- Place subprogram on scope stack, and make formals visible. If there |
2604 | -- is a spec, the visible entity remains that of the spec. | |
2605 | ||
2606 | if Present (Spec_Id) then | |
07fc65c4 | 2607 | Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
758c442c GD |
2608 | |
2609 | if Is_Child_Unit (Spec_Id) then | |
2610 | Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); | |
2611 | end if; | |
2612 | ||
fbf5a39b AC |
2613 | if Style_Check then |
2614 | Style.Check_Identifier (Body_Id, Spec_Id); | |
2615 | end if; | |
996ae0b0 RK |
2616 | |
2617 | Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); | |
2618 | Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); | |
2619 | ||
f937473f | 2620 | if Is_Abstract_Subprogram (Spec_Id) then |
ed2233dc | 2621 | Error_Msg_N ("an abstract subprogram cannot have a body", N); |
996ae0b0 | 2622 | return; |
21d27997 | 2623 | |
996ae0b0 RK |
2624 | else |
2625 | Set_Convention (Body_Id, Convention (Spec_Id)); | |
2626 | Set_Has_Completion (Spec_Id); | |
2627 | ||
2628 | if Is_Protected_Type (Scope (Spec_Id)) then | |
21d27997 | 2629 | Prot_Typ := Scope (Spec_Id); |
996ae0b0 RK |
2630 | end if; |
2631 | ||
2632 | -- If this is a body generated for a renaming, do not check for | |
2633 | -- full conformance. The check is redundant, because the spec of | |
2634 | -- the body is a copy of the spec in the renaming declaration, | |
2635 | -- and the test can lead to spurious errors on nested defaults. | |
2636 | ||
2637 | if Present (Spec_Decl) | |
996ae0b0 | 2638 | and then not Comes_From_Source (N) |
93a81b02 GB |
2639 | and then |
2640 | (Nkind (Original_Node (Spec_Decl)) = | |
d2f97d3e GB |
2641 | N_Subprogram_Renaming_Declaration |
2642 | or else (Present (Corresponding_Body (Spec_Decl)) | |
2643 | and then | |
2644 | Nkind (Unit_Declaration_Node | |
2645 | (Corresponding_Body (Spec_Decl))) = | |
2646 | N_Subprogram_Renaming_Declaration)) | |
996ae0b0 RK |
2647 | then |
2648 | Conformant := True; | |
cabe9abc AC |
2649 | |
2650 | -- Conversely, the spec may have been generated for specless body | |
2651 | -- with an inline pragma. | |
2652 | ||
2653 | elsif Comes_From_Source (N) | |
2654 | and then not Comes_From_Source (Spec_Id) | |
2655 | and then Has_Pragma_Inline (Spec_Id) | |
2656 | then | |
2657 | Conformant := True; | |
76a69663 | 2658 | |
996ae0b0 RK |
2659 | else |
2660 | Check_Conformance | |
2661 | (Body_Id, Spec_Id, | |
76a69663 | 2662 | Fully_Conformant, True, Conformant, Body_Id); |
996ae0b0 RK |
2663 | end if; |
2664 | ||
2665 | -- If the body is not fully conformant, we have to decide if we | |
2666 | -- should analyze it or not. If it has a really messed up profile | |
2667 | -- then we probably should not analyze it, since we will get too | |
2668 | -- many bogus messages. | |
2669 | ||
2670 | -- Our decision is to go ahead in the non-fully conformant case | |
2671 | -- only if it is at least mode conformant with the spec. Note | |
2672 | -- that the call to Check_Fully_Conformant has issued the proper | |
2673 | -- error messages to complain about the lack of conformance. | |
2674 | ||
2675 | if not Conformant | |
2676 | and then not Mode_Conformant (Body_Id, Spec_Id) | |
2677 | then | |
2678 | return; | |
2679 | end if; | |
2680 | end if; | |
2681 | ||
996ae0b0 | 2682 | if Spec_Id /= Body_Id then |
fbf5a39b | 2683 | Reference_Body_Formals (Spec_Id, Body_Id); |
996ae0b0 RK |
2684 | end if; |
2685 | ||
2686 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
2687 | Set_Corresponding_Spec (N, Spec_Id); | |
758c442c | 2688 | |
5d37ba92 ES |
2689 | -- Ada 2005 (AI-345): If the operation is a primitive operation |
2690 | -- of a concurrent type, the type of the first parameter has been | |
2691 | -- replaced with the corresponding record, which is the proper | |
2692 | -- run-time structure to use. However, within the body there may | |
2693 | -- be uses of the formals that depend on primitive operations | |
2694 | -- of the type (in particular calls in prefixed form) for which | |
2695 | -- we need the original concurrent type. The operation may have | |
2696 | -- several controlling formals, so the replacement must be done | |
2697 | -- for all of them. | |
758c442c GD |
2698 | |
2699 | if Comes_From_Source (Spec_Id) | |
2700 | and then Present (First_Entity (Spec_Id)) | |
2701 | and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type | |
2702 | and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) | |
5d37ba92 | 2703 | and then |
ce2b6ba5 | 2704 | Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
5d37ba92 ES |
2705 | and then |
2706 | Present | |
21d27997 RD |
2707 | (Corresponding_Concurrent_Type |
2708 | (Etype (First_Entity (Spec_Id)))) | |
758c442c | 2709 | then |
5d37ba92 ES |
2710 | declare |
2711 | Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); | |
2712 | Form : Entity_Id; | |
2713 | ||
2714 | begin | |
2715 | Form := First_Formal (Spec_Id); | |
2716 | while Present (Form) loop | |
2717 | if Etype (Form) = Typ then | |
2718 | Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); | |
2719 | end if; | |
2720 | ||
2721 | Next_Formal (Form); | |
2722 | end loop; | |
2723 | end; | |
758c442c GD |
2724 | end if; |
2725 | ||
21d27997 RD |
2726 | -- Make the formals visible, and place subprogram on scope stack. |
2727 | -- This is also the point at which we set Last_Real_Spec_Entity | |
2728 | -- to mark the entities which will not be moved to the body. | |
758c442c | 2729 | |
996ae0b0 | 2730 | Install_Formals (Spec_Id); |
21d27997 | 2731 | Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
0a36105d | 2732 | Push_Scope (Spec_Id); |
996ae0b0 RK |
2733 | |
2734 | -- Make sure that the subprogram is immediately visible. For | |
2735 | -- child units that have no separate spec this is indispensable. | |
2736 | -- Otherwise it is safe albeit redundant. | |
2737 | ||
2738 | Set_Is_Immediately_Visible (Spec_Id); | |
2739 | end if; | |
2740 | ||
2741 | Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); | |
2742 | Set_Ekind (Body_Id, E_Subprogram_Body); | |
2743 | Set_Scope (Body_Id, Scope (Spec_Id)); | |
ec4867fa | 2744 | Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
996ae0b0 RK |
2745 | |
2746 | -- Case of subprogram body with no previous spec | |
2747 | ||
2748 | else | |
3e5daac4 AC |
2749 | -- Check for style warning required |
2750 | ||
996ae0b0 | 2751 | if Style_Check |
3e5daac4 AC |
2752 | |
2753 | -- Only apply check for source level subprograms for which checks | |
2754 | -- have not been suppressed. | |
2755 | ||
996ae0b0 RK |
2756 | and then Comes_From_Source (Body_Id) |
2757 | and then not Suppress_Style_Checks (Body_Id) | |
3e5daac4 AC |
2758 | |
2759 | -- No warnings within an instance | |
2760 | ||
996ae0b0 | 2761 | and then not In_Instance |
3e5daac4 | 2762 | |
b0186f71 | 2763 | -- No warnings for expression functions |
3e5daac4 | 2764 | |
b0186f71 | 2765 | and then Nkind (Original_Node (N)) /= N_Expression_Function |
996ae0b0 RK |
2766 | then |
2767 | Style.Body_With_No_Spec (N); | |
2768 | end if; | |
2769 | ||
2770 | New_Overloaded_Entity (Body_Id); | |
2771 | ||
2772 | if Nkind (N) /= N_Subprogram_Body_Stub then | |
2773 | Set_Acts_As_Spec (N); | |
2774 | Generate_Definition (Body_Id); | |
dac3bede | 2775 | Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id))); |
fbf5a39b AC |
2776 | Generate_Reference |
2777 | (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); | |
996ae0b0 | 2778 | Install_Formals (Body_Id); |
0a36105d | 2779 | Push_Scope (Body_Id); |
996ae0b0 | 2780 | end if; |
dbe36d67 AC |
2781 | |
2782 | -- For stubs and bodies with no previous spec, generate references to | |
2783 | -- formals. | |
2784 | ||
2785 | Generate_Reference_To_Formals (Body_Id); | |
996ae0b0 RK |
2786 | end if; |
2787 | ||
76a69663 ES |
2788 | -- If the return type is an anonymous access type whose designated type |
2789 | -- is the limited view of a class-wide type and the non-limited view is | |
2790 | -- available, update the return type accordingly. | |
ec4867fa | 2791 | |
0791fbe9 | 2792 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
2793 | and then Comes_From_Source (N) |
2794 | then | |
2795 | declare | |
ec4867fa | 2796 | Etyp : Entity_Id; |
0a36105d | 2797 | Rtyp : Entity_Id; |
ec4867fa ES |
2798 | |
2799 | begin | |
0a36105d JM |
2800 | Rtyp := Etype (Current_Scope); |
2801 | ||
2802 | if Ekind (Rtyp) = E_Anonymous_Access_Type then | |
2803 | Etyp := Directly_Designated_Type (Rtyp); | |
2804 | ||
2805 | if Is_Class_Wide_Type (Etyp) | |
2806 | and then From_With_Type (Etyp) | |
2807 | then | |
2808 | Set_Directly_Designated_Type | |
2809 | (Etype (Current_Scope), Available_View (Etyp)); | |
2810 | end if; | |
2811 | end if; | |
ec4867fa ES |
2812 | end; |
2813 | end if; | |
2814 | ||
996ae0b0 RK |
2815 | -- If this is the proper body of a stub, we must verify that the stub |
2816 | -- conforms to the body, and to the previous spec if one was present. | |
dbe36d67 | 2817 | -- We know already that the body conforms to that spec. This test is |
996ae0b0 RK |
2818 | -- only required for subprograms that come from source. |
2819 | ||
2820 | if Nkind (Parent (N)) = N_Subunit | |
2821 | and then Comes_From_Source (N) | |
2822 | and then not Error_Posted (Body_Id) | |
e895b435 ES |
2823 | and then Nkind (Corresponding_Stub (Parent (N))) = |
2824 | N_Subprogram_Body_Stub | |
996ae0b0 RK |
2825 | then |
2826 | declare | |
fbf5a39b AC |
2827 | Old_Id : constant Entity_Id := |
2828 | Defining_Entity | |
2829 | (Specification (Corresponding_Stub (Parent (N)))); | |
2830 | ||
996ae0b0 | 2831 | Conformant : Boolean := False; |
996ae0b0 RK |
2832 | |
2833 | begin | |
2834 | if No (Spec_Id) then | |
2835 | Check_Fully_Conformant (Body_Id, Old_Id); | |
2836 | ||
2837 | else | |
2838 | Check_Conformance | |
2839 | (Body_Id, Old_Id, Fully_Conformant, False, Conformant); | |
2840 | ||
2841 | if not Conformant then | |
2842 | ||
dbe36d67 AC |
2843 | -- The stub was taken to be a new declaration. Indicate that |
2844 | -- it lacks a body. | |
996ae0b0 RK |
2845 | |
2846 | Set_Has_Completion (Old_Id, False); | |
2847 | end if; | |
2848 | end if; | |
2849 | end; | |
2850 | end if; | |
2851 | ||
2852 | Set_Has_Completion (Body_Id); | |
2853 | Check_Eliminated (Body_Id); | |
2854 | ||
2855 | if Nkind (N) = N_Subprogram_Body_Stub then | |
2856 | return; | |
84f4072a | 2857 | end if; |
996ae0b0 | 2858 | |
84f4072a JM |
2859 | -- Handle frontend inlining. There is no need to prepare us for inlining |
2860 | -- if we will not generate the code. | |
2861 | ||
2862 | -- Old semantics | |
2863 | ||
2864 | if not Debug_Flag_Dot_K then | |
2865 | if Present (Spec_Id) | |
2866 | and then Expander_Active | |
2867 | and then | |
2868 | (Has_Pragma_Inline_Always (Spec_Id) | |
2869 | or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining)) | |
2870 | then | |
2871 | Build_Body_To_Inline (N, Spec_Id); | |
2872 | end if; | |
2873 | ||
2874 | -- New semantics | |
2875 | ||
2876 | elsif Expander_Active | |
2877 | and then Serious_Errors_Detected = 0 | |
2878 | and then Present (Spec_Id) | |
2879 | and then Has_Pragma_Inline (Spec_Id) | |
996ae0b0 | 2880 | then |
84f4072a | 2881 | Check_And_Build_Body_To_Inline (N, Spec_Id, Body_Id); |
996ae0b0 RK |
2882 | end if; |
2883 | ||
0ab80019 | 2884 | -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
dbe36d67 | 2885 | -- of the specification we have to install the private withed units. |
21d27997 | 2886 | -- This holds for child units as well. |
9bc856dd AC |
2887 | |
2888 | if Is_Compilation_Unit (Body_Id) | |
21d27997 | 2889 | or else Nkind (Parent (N)) = N_Compilation_Unit |
9bc856dd AC |
2890 | then |
2891 | Install_Private_With_Clauses (Body_Id); | |
2892 | end if; | |
2893 | ||
ec4867fa ES |
2894 | Check_Anonymous_Return; |
2895 | ||
fdce4bb7 JM |
2896 | -- Set the Protected_Formal field of each extra formal of the protected |
2897 | -- subprogram to reference the corresponding extra formal of the | |
2898 | -- subprogram that implements it. For regular formals this occurs when | |
2899 | -- the protected subprogram's declaration is expanded, but the extra | |
2900 | -- formals don't get created until the subprogram is frozen. We need to | |
2901 | -- do this before analyzing the protected subprogram's body so that any | |
2902 | -- references to the original subprogram's extra formals will be changed | |
2903 | -- refer to the implementing subprogram's formals (see Expand_Formal). | |
2904 | ||
2905 | if Present (Spec_Id) | |
2906 | and then Is_Protected_Type (Scope (Spec_Id)) | |
2907 | and then Present (Protected_Body_Subprogram (Spec_Id)) | |
2908 | then | |
2909 | declare | |
2910 | Impl_Subp : constant Entity_Id := | |
2911 | Protected_Body_Subprogram (Spec_Id); | |
2912 | Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); | |
2913 | Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); | |
fdce4bb7 JM |
2914 | begin |
2915 | while Present (Prot_Ext_Formal) loop | |
2916 | pragma Assert (Present (Impl_Ext_Formal)); | |
fdce4bb7 | 2917 | Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
fdce4bb7 JM |
2918 | Next_Formal_With_Extras (Prot_Ext_Formal); |
2919 | Next_Formal_With_Extras (Impl_Ext_Formal); | |
2920 | end loop; | |
2921 | end; | |
2922 | end if; | |
2923 | ||
0868e09c | 2924 | -- Now we can go on to analyze the body |
996ae0b0 RK |
2925 | |
2926 | HSS := Handled_Statement_Sequence (N); | |
2927 | Set_Actual_Subtypes (N, Current_Scope); | |
21d27997 | 2928 | |
483361a6 AC |
2929 | -- Deal with preconditions and postconditions. In formal verification |
2930 | -- mode, we keep pre- and postconditions attached to entities rather | |
2931 | -- than inserted in the code, in order to facilitate a distinct | |
2932 | -- treatment for them. | |
21d27997 | 2933 | |
56812278 | 2934 | if not Alfa_Mode then |
483361a6 AC |
2935 | Process_PPCs (N, Spec_Id, Body_Id); |
2936 | end if; | |
21d27997 | 2937 | |
f3d0f304 | 2938 | -- Add a declaration for the Protection object, renaming declarations |
21d27997 RD |
2939 | -- for discriminals and privals and finally a declaration for the entry |
2940 | -- family index (if applicable). This form of early expansion is done | |
2941 | -- when the Expander is active because Install_Private_Data_Declarations | |
81bf2382 AC |
2942 | -- references entities which were created during regular expansion. The |
2943 | -- body may be the rewritting of an expression function, and we need to | |
2944 | -- verify that the original node is in the source. | |
21d27997 | 2945 | |
da94696d | 2946 | if Full_Expander_Active |
13a0b1e8 | 2947 | and then Comes_From_Source (Original_Node (N)) |
21d27997 RD |
2948 | and then Present (Prot_Typ) |
2949 | and then Present (Spec_Id) | |
2950 | and then not Is_Eliminated (Spec_Id) | |
2951 | then | |
2952 | Install_Private_Data_Declarations | |
2953 | (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); | |
2954 | end if; | |
2955 | ||
5dcab3ca AC |
2956 | -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
2957 | -- may now appear in parameter and result profiles. Since the analysis | |
2958 | -- of a subprogram body may use the parameter and result profile of the | |
2959 | -- spec, swap any limited views with their non-limited counterpart. | |
2960 | ||
2961 | if Ada_Version >= Ada_2012 then | |
2962 | Exchange_Limited_Views (Spec_Id); | |
2963 | end if; | |
2964 | ||
21d27997 RD |
2965 | -- Analyze the declarations (this call will analyze the precondition |
2966 | -- Check pragmas we prepended to the list, as well as the declaration | |
2967 | -- of the _Postconditions procedure). | |
2968 | ||
996ae0b0 | 2969 | Analyze_Declarations (Declarations (N)); |
21d27997 RD |
2970 | |
2971 | -- Check completion, and analyze the statements | |
2972 | ||
996ae0b0 | 2973 | Check_Completion; |
33931112 | 2974 | Inspect_Deferred_Constant_Completion (Declarations (N)); |
996ae0b0 | 2975 | Analyze (HSS); |
21d27997 RD |
2976 | |
2977 | -- Deal with end of scope processing for the body | |
2978 | ||
07fc65c4 | 2979 | Process_End_Label (HSS, 't', Current_Scope); |
996ae0b0 RK |
2980 | End_Scope; |
2981 | Check_Subprogram_Order (N); | |
c37bb106 | 2982 | Set_Analyzed (Body_Id); |
996ae0b0 RK |
2983 | |
2984 | -- If we have a separate spec, then the analysis of the declarations | |
2985 | -- caused the entities in the body to be chained to the spec id, but | |
2986 | -- we want them chained to the body id. Only the formal parameters | |
2987 | -- end up chained to the spec id in this case. | |
2988 | ||
2989 | if Present (Spec_Id) then | |
2990 | ||
d39d6bb8 | 2991 | -- We must conform to the categorization of our spec |
996ae0b0 | 2992 | |
d39d6bb8 | 2993 | Validate_Categorization_Dependency (N, Spec_Id); |
996ae0b0 | 2994 | |
d39d6bb8 RD |
2995 | -- And if this is a child unit, the parent units must conform |
2996 | ||
2997 | if Is_Child_Unit (Spec_Id) then | |
996ae0b0 RK |
2998 | Validate_Categorization_Dependency |
2999 | (Unit_Declaration_Node (Spec_Id), Spec_Id); | |
3000 | end if; | |
3001 | ||
21d27997 RD |
3002 | -- Here is where we move entities from the spec to the body |
3003 | ||
3004 | -- Case where there are entities that stay with the spec | |
3005 | ||
3006 | if Present (Last_Real_Spec_Entity) then | |
3007 | ||
dbe36d67 AC |
3008 | -- No body entities (happens when the only real spec entities come |
3009 | -- from precondition and postcondition pragmas). | |
21d27997 RD |
3010 | |
3011 | if No (Last_Entity (Body_Id)) then | |
3012 | Set_First_Entity | |
3013 | (Body_Id, Next_Entity (Last_Real_Spec_Entity)); | |
3014 | ||
3015 | -- Body entities present (formals), so chain stuff past them | |
3016 | ||
3017 | else | |
3018 | Set_Next_Entity | |
3019 | (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); | |
3020 | end if; | |
3021 | ||
3022 | Set_Next_Entity (Last_Real_Spec_Entity, Empty); | |
996ae0b0 | 3023 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
21d27997 RD |
3024 | Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
3025 | ||
dbe36d67 AC |
3026 | -- Case where there are no spec entities, in this case there can be |
3027 | -- no body entities either, so just move everything. | |
996ae0b0 RK |
3028 | |
3029 | else | |
21d27997 | 3030 | pragma Assert (No (Last_Entity (Body_Id))); |
996ae0b0 RK |
3031 | Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
3032 | Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); | |
3033 | Set_First_Entity (Spec_Id, Empty); | |
3034 | Set_Last_Entity (Spec_Id, Empty); | |
3035 | end if; | |
3036 | end if; | |
3037 | ||
7665e4bd | 3038 | Check_Missing_Return; |
996ae0b0 | 3039 | |
82c80734 | 3040 | -- Now we are going to check for variables that are never modified in |
76a69663 ES |
3041 | -- the body of the procedure. But first we deal with a special case |
3042 | -- where we want to modify this check. If the body of the subprogram | |
3043 | -- starts with a raise statement or its equivalent, or if the body | |
3044 | -- consists entirely of a null statement, then it is pretty obvious | |
3045 | -- that it is OK to not reference the parameters. For example, this | |
3046 | -- might be the following common idiom for a stubbed function: | |
82c80734 RD |
3047 | -- statement of the procedure raises an exception. In particular this |
3048 | -- deals with the common idiom of a stubbed function, which might | |
dbe36d67 | 3049 | -- appear as something like: |
fbf5a39b AC |
3050 | |
3051 | -- function F (A : Integer) return Some_Type; | |
3052 | -- X : Some_Type; | |
3053 | -- begin | |
3054 | -- raise Program_Error; | |
3055 | -- return X; | |
3056 | -- end F; | |
3057 | ||
76a69663 ES |
3058 | -- Here the purpose of X is simply to satisfy the annoying requirement |
3059 | -- in Ada that there be at least one return, and we certainly do not | |
3060 | -- want to go posting warnings on X that it is not initialized! On | |
3061 | -- the other hand, if X is entirely unreferenced that should still | |
3062 | -- get a warning. | |
3063 | ||
3064 | -- What we do is to detect these cases, and if we find them, flag the | |
3065 | -- subprogram as being Is_Trivial_Subprogram and then use that flag to | |
3066 | -- suppress unwanted warnings. For the case of the function stub above | |
3067 | -- we have a special test to set X as apparently assigned to suppress | |
3068 | -- the warning. | |
996ae0b0 RK |
3069 | |
3070 | declare | |
800621e0 | 3071 | Stm : Node_Id; |
996ae0b0 RK |
3072 | |
3073 | begin | |
0a36105d JM |
3074 | -- Skip initial labels (for one thing this occurs when we are in |
3075 | -- front end ZCX mode, but in any case it is irrelevant), and also | |
3076 | -- initial Push_xxx_Error_Label nodes, which are also irrelevant. | |
fbf5a39b | 3077 | |
800621e0 | 3078 | Stm := First (Statements (HSS)); |
0a36105d JM |
3079 | while Nkind (Stm) = N_Label |
3080 | or else Nkind (Stm) in N_Push_xxx_Label | |
3081 | loop | |
996ae0b0 | 3082 | Next (Stm); |
0a36105d | 3083 | end loop; |
996ae0b0 | 3084 | |
fbf5a39b AC |
3085 | -- Do the test on the original statement before expansion |
3086 | ||
3087 | declare | |
3088 | Ostm : constant Node_Id := Original_Node (Stm); | |
3089 | ||
3090 | begin | |
76a69663 | 3091 | -- If explicit raise statement, turn on flag |
fbf5a39b AC |
3092 | |
3093 | if Nkind (Ostm) = N_Raise_Statement then | |
76a69663 ES |
3094 | Set_Trivial_Subprogram (Stm); |
3095 | ||
f3d57416 | 3096 | -- If null statement, and no following statements, turn on flag |
76a69663 ES |
3097 | |
3098 | elsif Nkind (Stm) = N_Null_Statement | |
3099 | and then Comes_From_Source (Stm) | |
3100 | and then No (Next (Stm)) | |
3101 | then | |
3102 | Set_Trivial_Subprogram (Stm); | |
fbf5a39b AC |
3103 | |
3104 | -- Check for explicit call cases which likely raise an exception | |
3105 | ||
3106 | elsif Nkind (Ostm) = N_Procedure_Call_Statement then | |
3107 | if Is_Entity_Name (Name (Ostm)) then | |
3108 | declare | |
3109 | Ent : constant Entity_Id := Entity (Name (Ostm)); | |
3110 | ||
3111 | begin | |
3112 | -- If the procedure is marked No_Return, then likely it | |
3113 | -- raises an exception, but in any case it is not coming | |
76a69663 | 3114 | -- back here, so turn on the flag. |
fbf5a39b | 3115 | |
f46faa08 AC |
3116 | if Present (Ent) |
3117 | and then Ekind (Ent) = E_Procedure | |
fbf5a39b AC |
3118 | and then No_Return (Ent) |
3119 | then | |
76a69663 | 3120 | Set_Trivial_Subprogram (Stm); |
fbf5a39b AC |
3121 | end if; |
3122 | end; | |
3123 | end if; | |
3124 | end if; | |
3125 | end; | |
996ae0b0 RK |
3126 | end; |
3127 | ||
3128 | -- Check for variables that are never modified | |
3129 | ||
3130 | declare | |
3131 | E1, E2 : Entity_Id; | |
3132 | ||
3133 | begin | |
fbf5a39b | 3134 | -- If there is a separate spec, then transfer Never_Set_In_Source |
996ae0b0 RK |
3135 | -- flags from out parameters to the corresponding entities in the |
3136 | -- body. The reason we do that is we want to post error flags on | |
3137 | -- the body entities, not the spec entities. | |
3138 | ||
3139 | if Present (Spec_Id) then | |
3140 | E1 := First_Entity (Spec_Id); | |
996ae0b0 RK |
3141 | while Present (E1) loop |
3142 | if Ekind (E1) = E_Out_Parameter then | |
3143 | E2 := First_Entity (Body_Id); | |
fbf5a39b | 3144 | while Present (E2) loop |
996ae0b0 RK |
3145 | exit when Chars (E1) = Chars (E2); |
3146 | Next_Entity (E2); | |
3147 | end loop; | |
3148 | ||
fbf5a39b AC |
3149 | if Present (E2) then |
3150 | Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); | |
3151 | end if; | |
996ae0b0 RK |
3152 | end if; |
3153 | ||
3154 | Next_Entity (E1); | |
3155 | end loop; | |
3156 | end if; | |
3157 | ||
0868e09c RD |
3158 | -- Check references in body unless it was deleted. Note that the |
3159 | -- check of Body_Deleted here is not just for efficiency, it is | |
3160 | -- necessary to avoid junk warnings on formal parameters. | |
3161 | ||
3162 | if not Body_Deleted then | |
3163 | Check_References (Body_Id); | |
3164 | end if; | |
996ae0b0 | 3165 | end; |
b1b543d2 | 3166 | end Analyze_Subprogram_Body_Helper; |
996ae0b0 RK |
3167 | |
3168 | ------------------------------------ | |
3169 | -- Analyze_Subprogram_Declaration -- | |
3170 | ------------------------------------ | |
3171 | ||
3172 | procedure Analyze_Subprogram_Declaration (N : Node_Id) is | |
5d5832bc | 3173 | Loc : constant Source_Ptr := Sloc (N); |
0f1a6a0b | 3174 | Scop : constant Entity_Id := Current_Scope; |
5d5832bc AC |
3175 | Designator : Entity_Id; |
3176 | Form : Node_Id; | |
5d5832bc | 3177 | Null_Body : Node_Id := Empty; |
996ae0b0 RK |
3178 | |
3179 | -- Start of processing for Analyze_Subprogram_Declaration | |
3180 | ||
3181 | begin | |
2ba431e5 | 3182 | -- Null procedures are not allowed in SPARK |
daec8eeb | 3183 | |
fe5d3068 | 3184 | if Nkind (Specification (N)) = N_Procedure_Specification |
daec8eeb YM |
3185 | and then Null_Present (Specification (N)) |
3186 | then | |
2ba431e5 | 3187 | Check_SPARK_Restriction ("null procedure is not allowed", N); |
daec8eeb YM |
3188 | end if; |
3189 | ||
349ff68f | 3190 | -- For a null procedure, capture the profile before analysis, for |
c159409f AC |
3191 | -- expansion at the freeze point and at each point of call. The body |
3192 | -- will only be used if the procedure has preconditions. In that case | |
3193 | -- the body is analyzed at the freeze point. | |
5d5832bc AC |
3194 | |
3195 | if Nkind (Specification (N)) = N_Procedure_Specification | |
3196 | and then Null_Present (Specification (N)) | |
3197 | and then Expander_Active | |
3198 | then | |
3199 | Null_Body := | |
3200 | Make_Subprogram_Body (Loc, | |
3201 | Specification => | |
3202 | New_Copy_Tree (Specification (N)), | |
349ff68f AC |
3203 | Declarations => |
3204 | New_List, | |
5d5832bc AC |
3205 | Handled_Statement_Sequence => |
3206 | Make_Handled_Sequence_Of_Statements (Loc, | |
3207 | Statements => New_List (Make_Null_Statement (Loc)))); | |
3208 | ||
01957849 | 3209 | -- Create new entities for body and formals |
5d5832bc AC |
3210 | |
3211 | Set_Defining_Unit_Name (Specification (Null_Body), | |
3212 | Make_Defining_Identifier (Loc, Chars (Defining_Entity (N)))); | |
5d5832bc AC |
3213 | |
3214 | Form := First (Parameter_Specifications (Specification (Null_Body))); | |
3215 | while Present (Form) loop | |
3216 | Set_Defining_Identifier (Form, | |
3217 | Make_Defining_Identifier (Loc, | |
3218 | Chars (Defining_Identifier (Form)))); | |
718deaf1 AC |
3219 | |
3220 | -- Resolve the types of the formals now, because the freeze point | |
3221 | -- may appear in a different context, e.g. an instantiation. | |
3222 | ||
3223 | if Nkind (Parameter_Type (Form)) /= N_Access_Definition then | |
3224 | Find_Type (Parameter_Type (Form)); | |
3225 | ||
3226 | elsif | |
3227 | No (Access_To_Subprogram_Definition (Parameter_Type (Form))) | |
3228 | then | |
3229 | Find_Type (Subtype_Mark (Parameter_Type (Form))); | |
3230 | ||
3231 | else | |
3232 | ||
3233 | -- the case of a null procedure with a formal that is an | |
3234 | -- access_to_subprogram type, and that is used as an actual | |
3235 | -- in an instantiation is left to the enthusiastic reader. | |
3236 | ||
3237 | null; | |
3238 | end if; | |
3239 | ||
5d5832bc AC |
3240 | Next (Form); |
3241 | end loop; | |
3242 | ||
3243 | if Is_Protected_Type (Current_Scope) then | |
ed2233dc | 3244 | Error_Msg_N ("protected operation cannot be a null procedure", N); |
5d5832bc AC |
3245 | end if; |
3246 | end if; | |
3247 | ||
beacce02 | 3248 | Designator := Analyze_Subprogram_Specification (Specification (N)); |
31af8899 AC |
3249 | |
3250 | -- A reference may already have been generated for the unit name, in | |
3251 | -- which case the following call is redundant. However it is needed for | |
3252 | -- declarations that are the rewriting of an expression function. | |
3253 | ||
5d5832bc AC |
3254 | Generate_Definition (Designator); |
3255 | ||
b1b543d2 BD |
3256 | if Debug_Flag_C then |
3257 | Write_Str ("==> subprogram spec "); | |
3258 | Write_Name (Chars (Designator)); | |
3259 | Write_Str (" from "); | |
3260 | Write_Location (Sloc (N)); | |
3261 | Write_Eol; | |
3262 | Indent; | |
3263 | end if; | |
3264 | ||
5d5832bc AC |
3265 | if Nkind (Specification (N)) = N_Procedure_Specification |
3266 | and then Null_Present (Specification (N)) | |
3267 | then | |
3268 | Set_Has_Completion (Designator); | |
996ae0b0 | 3269 | |
b3aa0ca8 AC |
3270 | -- Null procedures are always inlined, but generic formal subprograms |
3271 | -- which appear as such in the internal instance of formal packages, | |
3272 | -- need no completion and are not marked Inline. | |
3273 | ||
3274 | if Present (Null_Body) | |
3275 | and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration | |
3276 | then | |
5d5832bc AC |
3277 | Set_Corresponding_Body (N, Defining_Entity (Null_Body)); |
3278 | Set_Body_To_Inline (N, Null_Body); | |
3279 | Set_Is_Inlined (Designator); | |
3280 | end if; | |
3281 | end if; | |
996ae0b0 RK |
3282 | |
3283 | Validate_RCI_Subprogram_Declaration (N); | |
996ae0b0 RK |
3284 | New_Overloaded_Entity (Designator); |
3285 | Check_Delayed_Subprogram (Designator); | |
fbf5a39b | 3286 | |
6ca063eb AC |
3287 | -- If the type of the first formal of the current subprogram is a |
3288 | -- nongeneric tagged private type, mark the subprogram as being a | |
3289 | -- private primitive. Ditto if this is a function with controlling | |
b7d5e87b AC |
3290 | -- result, and the return type is currently private. In both cases, |
3291 | -- the type of the controlling argument or result must be in the | |
3292 | -- current scope for the operation to be primitive. | |
6ca063eb AC |
3293 | |
3294 | if Has_Controlling_Result (Designator) | |
3295 | and then Is_Private_Type (Etype (Designator)) | |
b7d5e87b | 3296 | and then Scope (Etype (Designator)) = Current_Scope |
6ca063eb AC |
3297 | and then not Is_Generic_Actual_Type (Etype (Designator)) |
3298 | then | |
3299 | Set_Is_Private_Primitive (Designator); | |
d44202ba | 3300 | |
6ca063eb | 3301 | elsif Present (First_Formal (Designator)) then |
d44202ba HK |
3302 | declare |
3303 | Formal_Typ : constant Entity_Id := | |
3304 | Etype (First_Formal (Designator)); | |
3305 | begin | |
3306 | Set_Is_Private_Primitive (Designator, | |
3307 | Is_Tagged_Type (Formal_Typ) | |
b7d5e87b | 3308 | and then Scope (Formal_Typ) = Current_Scope |
d44202ba HK |
3309 | and then Is_Private_Type (Formal_Typ) |
3310 | and then not Is_Generic_Actual_Type (Formal_Typ)); | |
3311 | end; | |
3312 | end if; | |
3313 | ||
ec4867fa ES |
3314 | -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
3315 | -- or null. | |
3316 | ||
0791fbe9 | 3317 | if Ada_Version >= Ada_2005 |
ec4867fa ES |
3318 | and then Comes_From_Source (N) |
3319 | and then Is_Dispatching_Operation (Designator) | |
3320 | then | |
3321 | declare | |
3322 | E : Entity_Id; | |
3323 | Etyp : Entity_Id; | |
3324 | ||
3325 | begin | |
3326 | if Has_Controlling_Result (Designator) then | |
3327 | Etyp := Etype (Designator); | |
3328 | ||
3329 | else | |
3330 | E := First_Entity (Designator); | |
3331 | while Present (E) | |
3332 | and then Is_Formal (E) | |
3333 | and then not Is_Controlling_Formal (E) | |
3334 | loop | |
3335 | Next_Entity (E); | |
3336 | end loop; | |
3337 | ||
3338 | Etyp := Etype (E); | |
3339 | end if; | |
3340 | ||
3341 | if Is_Access_Type (Etyp) then | |
3342 | Etyp := Directly_Designated_Type (Etyp); | |
3343 | end if; | |
3344 | ||
3345 | if Is_Interface (Etyp) | |
f937473f | 3346 | and then not Is_Abstract_Subprogram (Designator) |
ec4867fa ES |
3347 | and then not (Ekind (Designator) = E_Procedure |
3348 | and then Null_Present (Specification (N))) | |
3349 | then | |
3350 | Error_Msg_Name_1 := Chars (Defining_Entity (N)); | |
033eaf85 AC |
3351 | |
3352 | -- Specialize error message based on procedures vs. functions, | |
3353 | -- since functions can't be null subprograms. | |
3354 | ||
3355 | if Ekind (Designator) = E_Procedure then | |
3356 | Error_Msg_N | |
3357 | ("interface procedure % must be abstract or null", N); | |
3358 | else | |
3359 | Error_Msg_N ("interface function % must be abstract", N); | |
3360 | end if; | |
ec4867fa ES |
3361 | end if; |
3362 | end; | |
3363 | end if; | |
3364 | ||
fbf5a39b AC |
3365 | -- What is the following code for, it used to be |
3366 | ||
3367 | -- ??? Set_Suppress_Elaboration_Checks | |
3368 | -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); | |
3369 | ||
3370 | -- The following seems equivalent, but a bit dubious | |
3371 | ||
3372 | if Elaboration_Checks_Suppressed (Designator) then | |
3373 | Set_Kill_Elaboration_Checks (Designator); | |
3374 | end if; | |
996ae0b0 RK |
3375 | |
3376 | if Scop /= Standard_Standard | |
3377 | and then not Is_Child_Unit (Designator) | |
3378 | then | |
fbf5a39b | 3379 | Set_Categorization_From_Scope (Designator, Scop); |
996ae0b0 | 3380 | else |
e895b435 | 3381 | -- For a compilation unit, check for library-unit pragmas |
996ae0b0 | 3382 | |
0a36105d | 3383 | Push_Scope (Designator); |
996ae0b0 RK |
3384 | Set_Categorization_From_Pragmas (N); |
3385 | Validate_Categorization_Dependency (N, Designator); | |
3386 | Pop_Scope; | |
3387 | end if; | |
3388 | ||
3389 | -- For a compilation unit, set body required. This flag will only be | |
3390 | -- reset if a valid Import or Interface pragma is processed later on. | |
3391 | ||
3392 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
3393 | Set_Body_Required (Parent (N), True); | |
758c442c | 3394 | |
0791fbe9 | 3395 | if Ada_Version >= Ada_2005 |
758c442c GD |
3396 | and then Nkind (Specification (N)) = N_Procedure_Specification |
3397 | and then Null_Present (Specification (N)) | |
3398 | then | |
3399 | Error_Msg_N | |
3400 | ("null procedure cannot be declared at library level", N); | |
3401 | end if; | |
996ae0b0 RK |
3402 | end if; |
3403 | ||
fbf5a39b | 3404 | Generate_Reference_To_Formals (Designator); |
996ae0b0 | 3405 | Check_Eliminated (Designator); |
fbf5a39b | 3406 | |
b1b543d2 BD |
3407 | if Debug_Flag_C then |
3408 | Outdent; | |
3409 | Write_Str ("<== subprogram spec "); | |
3410 | Write_Name (Chars (Designator)); | |
3411 | Write_Str (" from "); | |
3412 | Write_Location (Sloc (N)); | |
3413 | Write_Eol; | |
3414 | end if; | |
0f1a6a0b | 3415 | |
1a265e78 AC |
3416 | if Is_Protected_Type (Current_Scope) then |
3417 | ||
3418 | -- Indicate that this is a protected operation, because it may be | |
3419 | -- used in subsequent declarations within the protected type. | |
3420 | ||
3421 | Set_Convention (Designator, Convention_Protected); | |
3422 | end if; | |
3423 | ||
beacce02 | 3424 | List_Inherited_Pre_Post_Aspects (Designator); |
eaba57fb RD |
3425 | |
3426 | if Has_Aspects (N) then | |
3427 | Analyze_Aspect_Specifications (N, Designator); | |
3428 | end if; | |
996ae0b0 RK |
3429 | end Analyze_Subprogram_Declaration; |
3430 | ||
fbf5a39b AC |
3431 | -------------------------------------- |
3432 | -- Analyze_Subprogram_Specification -- | |
3433 | -------------------------------------- | |
3434 | ||
3435 | -- Reminder: N here really is a subprogram specification (not a subprogram | |
3436 | -- declaration). This procedure is called to analyze the specification in | |
3437 | -- both subprogram bodies and subprogram declarations (specs). | |
3438 | ||
3439 | function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is | |
3440 | Designator : constant Entity_Id := Defining_Entity (N); | |
21d27997 | 3441 | Formals : constant List_Id := Parameter_Specifications (N); |
fbf5a39b | 3442 | |
758c442c GD |
3443 | -- Start of processing for Analyze_Subprogram_Specification |
3444 | ||
fbf5a39b | 3445 | begin |
2ba431e5 | 3446 | -- User-defined operator is not allowed in SPARK, except as a renaming |
38171f43 | 3447 | |
db72f10a AC |
3448 | if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
3449 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
3450 | then | |
2ba431e5 | 3451 | Check_SPARK_Restriction ("user-defined operator is not allowed", N); |
38171f43 AC |
3452 | end if; |
3453 | ||
31af8899 AC |
3454 | -- Proceed with analysis. Do not emit a cross-reference entry if the |
3455 | -- specification comes from an expression function, because it may be | |
3456 | -- the completion of a previous declaration. It is is not, the cross- | |
3457 | -- reference entry will be emitted for the new subprogram declaration. | |
3458 | ||
3459 | if Nkind (Parent (N)) /= N_Expression_Function then | |
3460 | Generate_Definition (Designator); | |
3461 | end if; | |
38171f43 | 3462 | |
dac3bede | 3463 | Set_Contract (Designator, Make_Contract (Sloc (Designator))); |
fbf5a39b AC |
3464 | |
3465 | if Nkind (N) = N_Function_Specification then | |
3466 | Set_Ekind (Designator, E_Function); | |
3467 | Set_Mechanism (Designator, Default_Mechanism); | |
fbf5a39b AC |
3468 | else |
3469 | Set_Ekind (Designator, E_Procedure); | |
3470 | Set_Etype (Designator, Standard_Void_Type); | |
3471 | end if; | |
3472 | ||
800621e0 | 3473 | -- Introduce new scope for analysis of the formals and the return type |
82c80734 RD |
3474 | |
3475 | Set_Scope (Designator, Current_Scope); | |
3476 | ||
fbf5a39b | 3477 | if Present (Formals) then |
0a36105d | 3478 | Push_Scope (Designator); |
fbf5a39b | 3479 | Process_Formals (Formals, N); |
758c442c | 3480 | |
a38ff9b1 ES |
3481 | -- Ada 2005 (AI-345): If this is an overriding operation of an |
3482 | -- inherited interface operation, and the controlling type is | |
3483 | -- a synchronized type, replace the type with its corresponding | |
3484 | -- record, to match the proper signature of an overriding operation. | |
69cb258c AC |
3485 | -- Same processing for an access parameter whose designated type is |
3486 | -- derived from a synchronized interface. | |
758c442c | 3487 | |
0791fbe9 | 3488 | if Ada_Version >= Ada_2005 then |
d44202ba HK |
3489 | declare |
3490 | Formal : Entity_Id; | |
3491 | Formal_Typ : Entity_Id; | |
3492 | Rec_Typ : Entity_Id; | |
69cb258c | 3493 | Desig_Typ : Entity_Id; |
0a36105d | 3494 | |
d44202ba HK |
3495 | begin |
3496 | Formal := First_Formal (Designator); | |
3497 | while Present (Formal) loop | |
3498 | Formal_Typ := Etype (Formal); | |
0a36105d | 3499 | |
d44202ba HK |
3500 | if Is_Concurrent_Type (Formal_Typ) |
3501 | and then Present (Corresponding_Record_Type (Formal_Typ)) | |
3502 | then | |
3503 | Rec_Typ := Corresponding_Record_Type (Formal_Typ); | |
3504 | ||
3505 | if Present (Interfaces (Rec_Typ)) then | |
3506 | Set_Etype (Formal, Rec_Typ); | |
3507 | end if; | |
69cb258c AC |
3508 | |
3509 | elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then | |
3510 | Desig_Typ := Designated_Type (Formal_Typ); | |
3511 | ||
3512 | if Is_Concurrent_Type (Desig_Typ) | |
3513 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
3514 | then | |
3515 | Rec_Typ := Corresponding_Record_Type (Desig_Typ); | |
3516 | ||
3517 | if Present (Interfaces (Rec_Typ)) then | |
3518 | Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); | |
3519 | end if; | |
3520 | end if; | |
d44202ba HK |
3521 | end if; |
3522 | ||
3523 | Next_Formal (Formal); | |
3524 | end loop; | |
3525 | end; | |
758c442c GD |
3526 | end if; |
3527 | ||
fbf5a39b | 3528 | End_Scope; |
82c80734 | 3529 | |
b66c3ff4 AC |
3530 | -- The subprogram scope is pushed and popped around the processing of |
3531 | -- the return type for consistency with call above to Process_Formals | |
3532 | -- (which itself can call Analyze_Return_Type), and to ensure that any | |
3533 | -- itype created for the return type will be associated with the proper | |
3534 | -- scope. | |
3535 | ||
82c80734 | 3536 | elsif Nkind (N) = N_Function_Specification then |
b66c3ff4 | 3537 | Push_Scope (Designator); |
82c80734 | 3538 | Analyze_Return_Type (N); |
b66c3ff4 | 3539 | End_Scope; |
fbf5a39b AC |
3540 | end if; |
3541 | ||
e606088a AC |
3542 | -- Function case |
3543 | ||
fbf5a39b | 3544 | if Nkind (N) = N_Function_Specification then |
e606088a AC |
3545 | |
3546 | -- Deal with operator symbol case | |
3547 | ||
fbf5a39b AC |
3548 | if Nkind (Designator) = N_Defining_Operator_Symbol then |
3549 | Valid_Operator_Definition (Designator); | |
3550 | end if; | |
3551 | ||
3552 | May_Need_Actuals (Designator); | |
3553 | ||
fe63b1b1 ES |
3554 | -- Ada 2005 (AI-251): If the return type is abstract, verify that |
3555 | -- the subprogram is abstract also. This does not apply to renaming | |
1adaea16 AC |
3556 | -- declarations, where abstractness is inherited, and to subprogram |
3557 | -- bodies generated for stream operations, which become renamings as | |
3558 | -- bodies. | |
2bfb1b72 | 3559 | |
fe63b1b1 ES |
3560 | -- In case of primitives associated with abstract interface types |
3561 | -- the check is applied later (see Analyze_Subprogram_Declaration). | |
ec4867fa | 3562 | |
1adaea16 AC |
3563 | if not Nkind_In (Original_Node (Parent (N)), |
3564 | N_Subprogram_Renaming_Declaration, | |
3565 | N_Abstract_Subprogram_Declaration, | |
3566 | N_Formal_Abstract_Subprogram_Declaration) | |
fbf5a39b | 3567 | then |
2e79de51 AC |
3568 | if Is_Abstract_Type (Etype (Designator)) |
3569 | and then not Is_Interface (Etype (Designator)) | |
3570 | then | |
3571 | Error_Msg_N | |
3572 | ("function that returns abstract type must be abstract", N); | |
3573 | ||
e606088a | 3574 | -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
2e79de51 AC |
3575 | -- access result whose designated type is abstract. |
3576 | ||
3577 | elsif Nkind (Result_Definition (N)) = N_Access_Definition | |
3578 | and then | |
3579 | not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) | |
3580 | and then Is_Abstract_Type (Designated_Type (Etype (Designator))) | |
dbe945f1 | 3581 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
3582 | then |
3583 | Error_Msg_N ("function whose access result designates " | |
3584 | & "abstract type must be abstract", N); | |
3585 | end if; | |
fbf5a39b AC |
3586 | end if; |
3587 | end if; | |
3588 | ||
3589 | return Designator; | |
3590 | end Analyze_Subprogram_Specification; | |
3591 | ||
996ae0b0 RK |
3592 | -------------------------- |
3593 | -- Build_Body_To_Inline -- | |
3594 | -------------------------- | |
3595 | ||
d05ef0ab | 3596 | procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id) is |
f937473f | 3597 | Decl : constant Node_Id := Unit_Declaration_Node (Subp); |
996ae0b0 RK |
3598 | Original_Body : Node_Id; |
3599 | Body_To_Analyze : Node_Id; | |
3600 | Max_Size : constant := 10; | |
3601 | Stat_Count : Integer := 0; | |
3602 | ||
3603 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
e895b435 | 3604 | -- Check for declarations that make inlining not worthwhile |
996ae0b0 RK |
3605 | |
3606 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
82c80734 RD |
3607 | -- Check for statements that make inlining not worthwhile: any tasking |
3608 | -- statement, nested at any level. Keep track of total number of | |
3609 | -- elementary statements, as a measure of acceptable size. | |
996ae0b0 RK |
3610 | |
3611 | function Has_Pending_Instantiation return Boolean; | |
f937473f RD |
3612 | -- If some enclosing body contains instantiations that appear before the |
3613 | -- corresponding generic body, the enclosing body has a freeze node so | |
3614 | -- that it can be elaborated after the generic itself. This might | |
996ae0b0 RK |
3615 | -- conflict with subsequent inlinings, so that it is unsafe to try to |
3616 | -- inline in such a case. | |
3617 | ||
c8ef728f | 3618 | function Has_Single_Return return Boolean; |
f937473f RD |
3619 | -- In general we cannot inline functions that return unconstrained type. |
3620 | -- However, we can handle such functions if all return statements return | |
3621 | -- a local variable that is the only declaration in the body of the | |
3622 | -- function. In that case the call can be replaced by that local | |
3623 | -- variable as is done for other inlined calls. | |
c8ef728f | 3624 | |
fbf5a39b | 3625 | procedure Remove_Pragmas; |
76a69663 ES |
3626 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal |
3627 | -- parameter has no meaning when the body is inlined and the formals | |
3628 | -- are rewritten. Remove it from body to inline. The analysis of the | |
3629 | -- non-inlined body will handle the pragma properly. | |
996ae0b0 | 3630 | |
e895b435 ES |
3631 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean; |
3632 | -- If the body of the subprogram includes a call that returns an | |
3633 | -- unconstrained type, the secondary stack is involved, and it | |
3634 | -- is not worth inlining. | |
3635 | ||
996ae0b0 RK |
3636 | ------------------------------ |
3637 | -- Has_Excluded_Declaration -- | |
3638 | ------------------------------ | |
3639 | ||
3640 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
3641 | D : Node_Id; | |
3642 | ||
fbf5a39b | 3643 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; |
82c80734 RD |
3644 | -- Nested subprograms make a given body ineligible for inlining, but |
3645 | -- we make an exception for instantiations of unchecked conversion. | |
3646 | -- The body has not been analyzed yet, so check the name, and verify | |
3647 | -- that the visible entity with that name is the predefined unit. | |
3648 | ||
3649 | ----------------------------- | |
3650 | -- Is_Unchecked_Conversion -- | |
3651 | ----------------------------- | |
fbf5a39b AC |
3652 | |
3653 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
82c80734 | 3654 | Id : constant Node_Id := Name (D); |
fbf5a39b AC |
3655 | Conv : Entity_Id; |
3656 | ||
3657 | begin | |
3658 | if Nkind (Id) = N_Identifier | |
3659 | and then Chars (Id) = Name_Unchecked_Conversion | |
3660 | then | |
3661 | Conv := Current_Entity (Id); | |
3662 | ||
800621e0 | 3663 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) |
fbf5a39b AC |
3664 | and then Chars (Selector_Name (Id)) = Name_Unchecked_Conversion |
3665 | then | |
3666 | Conv := Current_Entity (Selector_Name (Id)); | |
fbf5a39b AC |
3667 | else |
3668 | return False; | |
3669 | end if; | |
3670 | ||
758c442c GD |
3671 | return Present (Conv) |
3672 | and then Is_Predefined_File_Name | |
3673 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
fbf5a39b AC |
3674 | and then Is_Intrinsic_Subprogram (Conv); |
3675 | end Is_Unchecked_Conversion; | |
3676 | ||
3677 | -- Start of processing for Has_Excluded_Declaration | |
3678 | ||
996ae0b0 RK |
3679 | begin |
3680 | D := First (Decls); | |
996ae0b0 | 3681 | while Present (D) loop |
800621e0 RD |
3682 | if (Nkind (D) = N_Function_Instantiation |
3683 | and then not Is_Unchecked_Conversion (D)) | |
3684 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
3685 | N_Package_Declaration, | |
3686 | N_Package_Instantiation, | |
3687 | N_Subprogram_Body, | |
3688 | N_Procedure_Instantiation, | |
3689 | N_Task_Type_Declaration) | |
996ae0b0 RK |
3690 | then |
3691 | Cannot_Inline | |
fbf5a39b | 3692 | ("cannot inline & (non-allowed declaration)?", D, Subp); |
996ae0b0 RK |
3693 | return True; |
3694 | end if; | |
3695 | ||
3696 | Next (D); | |
3697 | end loop; | |
3698 | ||
3699 | return False; | |
996ae0b0 RK |
3700 | end Has_Excluded_Declaration; |
3701 | ||
3702 | ---------------------------- | |
3703 | -- Has_Excluded_Statement -- | |
3704 | ---------------------------- | |
3705 | ||
3706 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
3707 | S : Node_Id; | |
3708 | E : Node_Id; | |
3709 | ||
3710 | begin | |
3711 | S := First (Stats); | |
996ae0b0 RK |
3712 | while Present (S) loop |
3713 | Stat_Count := Stat_Count + 1; | |
3714 | ||
800621e0 RD |
3715 | if Nkind_In (S, N_Abort_Statement, |
3716 | N_Asynchronous_Select, | |
3717 | N_Conditional_Entry_Call, | |
3718 | N_Delay_Relative_Statement, | |
3719 | N_Delay_Until_Statement, | |
3720 | N_Selective_Accept, | |
3721 | N_Timed_Entry_Call) | |
996ae0b0 RK |
3722 | then |
3723 | Cannot_Inline | |
fbf5a39b | 3724 | ("cannot inline & (non-allowed statement)?", S, Subp); |
996ae0b0 RK |
3725 | return True; |
3726 | ||
3727 | elsif Nkind (S) = N_Block_Statement then | |
3728 | if Present (Declarations (S)) | |
3729 | and then Has_Excluded_Declaration (Declarations (S)) | |
3730 | then | |
3731 | return True; | |
3732 | ||
3733 | elsif Present (Handled_Statement_Sequence (S)) | |
3734 | and then | |
3735 | (Present | |
3736 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
3737 | or else | |
3738 | Has_Excluded_Statement | |
3739 | (Statements (Handled_Statement_Sequence (S)))) | |
3740 | then | |
3741 | return True; | |
3742 | end if; | |
3743 | ||
3744 | elsif Nkind (S) = N_Case_Statement then | |
3745 | E := First (Alternatives (S)); | |
996ae0b0 RK |
3746 | while Present (E) loop |
3747 | if Has_Excluded_Statement (Statements (E)) then | |
3748 | return True; | |
3749 | end if; | |
3750 | ||
3751 | Next (E); | |
3752 | end loop; | |
3753 | ||
3754 | elsif Nkind (S) = N_If_Statement then | |
3755 | if Has_Excluded_Statement (Then_Statements (S)) then | |
3756 | return True; | |
3757 | end if; | |
3758 | ||
3759 | if Present (Elsif_Parts (S)) then | |
3760 | E := First (Elsif_Parts (S)); | |
996ae0b0 RK |
3761 | while Present (E) loop |
3762 | if Has_Excluded_Statement (Then_Statements (E)) then | |
3763 | return True; | |
3764 | end if; | |
3765 | Next (E); | |
3766 | end loop; | |
3767 | end if; | |
3768 | ||
3769 | if Present (Else_Statements (S)) | |
3770 | and then Has_Excluded_Statement (Else_Statements (S)) | |
3771 | then | |
3772 | return True; | |
3773 | end if; | |
3774 | ||
3775 | elsif Nkind (S) = N_Loop_Statement | |
3776 | and then Has_Excluded_Statement (Statements (S)) | |
3777 | then | |
3778 | return True; | |
3e2399ba AC |
3779 | |
3780 | elsif Nkind (S) = N_Extended_Return_Statement then | |
3781 | if Has_Excluded_Statement | |
3782 | (Statements (Handled_Statement_Sequence (S))) | |
3783 | or else Present | |
3784 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
3785 | then | |
3786 | return True; | |
3787 | end if; | |
996ae0b0 RK |
3788 | end if; |
3789 | ||
3790 | Next (S); | |
3791 | end loop; | |
3792 | ||
3793 | return False; | |
3794 | end Has_Excluded_Statement; | |
3795 | ||
3796 | ------------------------------- | |
3797 | -- Has_Pending_Instantiation -- | |
3798 | ------------------------------- | |
3799 | ||
3800 | function Has_Pending_Instantiation return Boolean is | |
ec4867fa | 3801 | S : Entity_Id; |
996ae0b0 RK |
3802 | |
3803 | begin | |
ec4867fa | 3804 | S := Current_Scope; |
996ae0b0 RK |
3805 | while Present (S) loop |
3806 | if Is_Compilation_Unit (S) | |
3807 | or else Is_Child_Unit (S) | |
3808 | then | |
3809 | return False; | |
bce79204 | 3810 | |
996ae0b0 RK |
3811 | elsif Ekind (S) = E_Package |
3812 | and then Has_Forward_Instantiation (S) | |
3813 | then | |
3814 | return True; | |
3815 | end if; | |
3816 | ||
3817 | S := Scope (S); | |
3818 | end loop; | |
3819 | ||
3820 | return False; | |
3821 | end Has_Pending_Instantiation; | |
3822 | ||
c8ef728f ES |
3823 | ------------------------ |
3824 | -- Has_Single_Return -- | |
3825 | ------------------------ | |
3826 | ||
3827 | function Has_Single_Return return Boolean is | |
3828 | Return_Statement : Node_Id := Empty; | |
3829 | ||
3830 | function Check_Return (N : Node_Id) return Traverse_Result; | |
3831 | ||
3832 | ------------------ | |
3833 | -- Check_Return -- | |
3834 | ------------------ | |
3835 | ||
3836 | function Check_Return (N : Node_Id) return Traverse_Result is | |
3837 | begin | |
5d37ba92 | 3838 | if Nkind (N) = N_Simple_Return_Statement then |
c8ef728f ES |
3839 | if Present (Expression (N)) |
3840 | and then Is_Entity_Name (Expression (N)) | |
3841 | then | |
3842 | if No (Return_Statement) then | |
3843 | Return_Statement := N; | |
3844 | return OK; | |
3845 | ||
3846 | elsif Chars (Expression (N)) = | |
3847 | Chars (Expression (Return_Statement)) | |
3848 | then | |
3849 | return OK; | |
3850 | ||
3851 | else | |
3852 | return Abandon; | |
3853 | end if; | |
3854 | ||
3e2399ba AC |
3855 | -- A return statement within an extended return is a noop |
3856 | -- after inlining. | |
3857 | ||
3858 | elsif No (Expression (N)) | |
3859 | and then Nkind (Parent (Parent (N))) = | |
3860 | N_Extended_Return_Statement | |
3861 | then | |
3862 | return OK; | |
3863 | ||
c8ef728f ES |
3864 | else |
3865 | -- Expression has wrong form | |
3866 | ||
3867 | return Abandon; | |
3868 | end if; | |
3869 | ||
3e2399ba AC |
3870 | -- We can only inline a build-in-place function if |
3871 | -- it has a single extended return. | |
3872 | ||
3873 | elsif Nkind (N) = N_Extended_Return_Statement then | |
3874 | if No (Return_Statement) then | |
3875 | Return_Statement := N; | |
3876 | return OK; | |
3877 | ||
3878 | else | |
3879 | return Abandon; | |
3880 | end if; | |
3881 | ||
c8ef728f ES |
3882 | else |
3883 | return OK; | |
3884 | end if; | |
3885 | end Check_Return; | |
3886 | ||
3887 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
3888 | ||
3889 | -- Start of processing for Has_Single_Return | |
3890 | ||
3891 | begin | |
3e2399ba AC |
3892 | if Check_All_Returns (N) /= OK then |
3893 | return False; | |
3894 | ||
3895 | elsif Nkind (Return_Statement) = N_Extended_Return_Statement then | |
3896 | return True; | |
3897 | ||
3898 | else | |
3899 | return Present (Declarations (N)) | |
3900 | and then Present (First (Declarations (N))) | |
3901 | and then Chars (Expression (Return_Statement)) = | |
3902 | Chars (Defining_Identifier (First (Declarations (N)))); | |
3903 | end if; | |
c8ef728f ES |
3904 | end Has_Single_Return; |
3905 | ||
fbf5a39b AC |
3906 | -------------------- |
3907 | -- Remove_Pragmas -- | |
3908 | -------------------- | |
3909 | ||
3910 | procedure Remove_Pragmas is | |
3911 | Decl : Node_Id; | |
3912 | Nxt : Node_Id; | |
3913 | ||
3914 | begin | |
3915 | Decl := First (Declarations (Body_To_Analyze)); | |
3916 | while Present (Decl) loop | |
3917 | Nxt := Next (Decl); | |
3918 | ||
3919 | if Nkind (Decl) = N_Pragma | |
76a69663 ES |
3920 | and then (Pragma_Name (Decl) = Name_Unreferenced |
3921 | or else | |
3922 | Pragma_Name (Decl) = Name_Unmodified) | |
fbf5a39b AC |
3923 | then |
3924 | Remove (Decl); | |
3925 | end if; | |
3926 | ||
3927 | Decl := Nxt; | |
3928 | end loop; | |
3929 | end Remove_Pragmas; | |
3930 | ||
e895b435 ES |
3931 | -------------------------- |
3932 | -- Uses_Secondary_Stack -- | |
3933 | -------------------------- | |
3934 | ||
3935 | function Uses_Secondary_Stack (Bod : Node_Id) return Boolean is | |
3936 | function Check_Call (N : Node_Id) return Traverse_Result; | |
3937 | -- Look for function calls that return an unconstrained type | |
3938 | ||
3939 | ---------------- | |
3940 | -- Check_Call -- | |
3941 | ---------------- | |
3942 | ||
3943 | function Check_Call (N : Node_Id) return Traverse_Result is | |
3944 | begin | |
3945 | if Nkind (N) = N_Function_Call | |
3946 | and then Is_Entity_Name (Name (N)) | |
3947 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
3948 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
3949 | then | |
3950 | Cannot_Inline | |
3951 | ("cannot inline & (call returns unconstrained type)?", | |
3952 | N, Subp); | |
3953 | return Abandon; | |
3954 | else | |
3955 | return OK; | |
3956 | end if; | |
3957 | end Check_Call; | |
3958 | ||
3959 | function Check_Calls is new Traverse_Func (Check_Call); | |
3960 | ||
3961 | begin | |
3962 | return Check_Calls (Bod) = Abandon; | |
3963 | end Uses_Secondary_Stack; | |
3964 | ||
996ae0b0 RK |
3965 | -- Start of processing for Build_Body_To_Inline |
3966 | ||
3967 | begin | |
8dbd1460 AC |
3968 | -- Return immediately if done already |
3969 | ||
996ae0b0 RK |
3970 | if Nkind (Decl) = N_Subprogram_Declaration |
3971 | and then Present (Body_To_Inline (Decl)) | |
3972 | then | |
8dbd1460 | 3973 | return; |
996ae0b0 | 3974 | |
08402a6d ES |
3975 | -- Functions that return unconstrained composite types require |
3976 | -- secondary stack handling, and cannot currently be inlined, unless | |
3977 | -- all return statements return a local variable that is the first | |
3978 | -- local declaration in the body. | |
996ae0b0 RK |
3979 | |
3980 | elsif Ekind (Subp) = E_Function | |
3981 | and then not Is_Scalar_Type (Etype (Subp)) | |
3982 | and then not Is_Access_Type (Etype (Subp)) | |
3983 | and then not Is_Constrained (Etype (Subp)) | |
3984 | then | |
08402a6d ES |
3985 | if not Has_Single_Return then |
3986 | Cannot_Inline | |
3987 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
3988 | return; | |
3989 | end if; | |
3990 | ||
3991 | -- Ditto for functions that return controlled types, where controlled | |
3992 | -- actions interfere in complex ways with inlining. | |
2820d220 AC |
3993 | |
3994 | elsif Ekind (Subp) = E_Function | |
048e5cef | 3995 | and then Needs_Finalization (Etype (Subp)) |
2820d220 AC |
3996 | then |
3997 | Cannot_Inline | |
3998 | ("cannot inline & (controlled return type)?", N, Subp); | |
3999 | return; | |
996ae0b0 RK |
4000 | end if; |
4001 | ||
d05ef0ab AC |
4002 | if Present (Declarations (N)) |
4003 | and then Has_Excluded_Declaration (Declarations (N)) | |
996ae0b0 | 4004 | then |
d05ef0ab | 4005 | return; |
996ae0b0 RK |
4006 | end if; |
4007 | ||
4008 | if Present (Handled_Statement_Sequence (N)) then | |
fbf5a39b AC |
4009 | if Present (Exception_Handlers (Handled_Statement_Sequence (N))) then |
4010 | Cannot_Inline | |
4011 | ("cannot inline& (exception handler)?", | |
4012 | First (Exception_Handlers (Handled_Statement_Sequence (N))), | |
4013 | Subp); | |
d05ef0ab | 4014 | return; |
996ae0b0 RK |
4015 | elsif |
4016 | Has_Excluded_Statement | |
4017 | (Statements (Handled_Statement_Sequence (N))) | |
4018 | then | |
d05ef0ab | 4019 | return; |
996ae0b0 RK |
4020 | end if; |
4021 | end if; | |
4022 | ||
4023 | -- We do not inline a subprogram that is too large, unless it is | |
4024 | -- marked Inline_Always. This pragma does not suppress the other | |
4025 | -- checks on inlining (forbidden declarations, handlers, etc). | |
4026 | ||
4027 | if Stat_Count > Max_Size | |
800621e0 | 4028 | and then not Has_Pragma_Inline_Always (Subp) |
996ae0b0 | 4029 | then |
fbf5a39b | 4030 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); |
d05ef0ab | 4031 | return; |
996ae0b0 RK |
4032 | end if; |
4033 | ||
4034 | if Has_Pending_Instantiation then | |
4035 | Cannot_Inline | |
fbf5a39b AC |
4036 | ("cannot inline& (forward instance within enclosing body)?", |
4037 | N, Subp); | |
d05ef0ab AC |
4038 | return; |
4039 | end if; | |
4040 | ||
4041 | -- Within an instance, the body to inline must be treated as a nested | |
4042 | -- generic, so that the proper global references are preserved. | |
4043 | ||
ce4e59c4 ST |
4044 | -- Note that we do not do this at the library level, because it is not |
4045 | -- needed, and furthermore this causes trouble if front end inlining | |
4046 | -- is activated (-gnatN). | |
4047 | ||
4048 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
4049 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); |
4050 | Original_Body := Copy_Generic_Node (N, Empty, True); | |
4051 | else | |
4052 | Original_Body := Copy_Separate_Tree (N); | |
996ae0b0 RK |
4053 | end if; |
4054 | ||
d05ef0ab AC |
4055 | -- We need to capture references to the formals in order to substitute |
4056 | -- the actuals at the point of inlining, i.e. instantiation. To treat | |
4057 | -- the formals as globals to the body to inline, we nest it within | |
4058 | -- a dummy parameterless subprogram, declared within the real one. | |
24105bab AC |
4059 | -- To avoid generating an internal name (which is never public, and |
4060 | -- which affects serial numbers of other generated names), we use | |
4061 | -- an internal symbol that cannot conflict with user declarations. | |
d05ef0ab AC |
4062 | |
4063 | Set_Parameter_Specifications (Specification (Original_Body), No_List); | |
24105bab AC |
4064 | Set_Defining_Unit_Name |
4065 | (Specification (Original_Body), | |
4066 | Make_Defining_Identifier (Sloc (N), Name_uParent)); | |
d05ef0ab AC |
4067 | Set_Corresponding_Spec (Original_Body, Empty); |
4068 | ||
996ae0b0 RK |
4069 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); |
4070 | ||
4071 | -- Set return type of function, which is also global and does not need | |
4072 | -- to be resolved. | |
4073 | ||
4074 | if Ekind (Subp) = E_Function then | |
41251c60 | 4075 | Set_Result_Definition (Specification (Body_To_Analyze), |
996ae0b0 RK |
4076 | New_Occurrence_Of (Etype (Subp), Sloc (N))); |
4077 | end if; | |
4078 | ||
4079 | if No (Declarations (N)) then | |
4080 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
4081 | else | |
4082 | Append (Body_To_Analyze, Declarations (N)); | |
4083 | end if; | |
4084 | ||
4085 | Expander_Mode_Save_And_Set (False); | |
fbf5a39b | 4086 | Remove_Pragmas; |
996ae0b0 RK |
4087 | |
4088 | Analyze (Body_To_Analyze); | |
0a36105d | 4089 | Push_Scope (Defining_Entity (Body_To_Analyze)); |
996ae0b0 RK |
4090 | Save_Global_References (Original_Body); |
4091 | End_Scope; | |
4092 | Remove (Body_To_Analyze); | |
4093 | ||
4094 | Expander_Mode_Restore; | |
d05ef0ab | 4095 | |
ce4e59c4 ST |
4096 | -- Restore environment if previously saved |
4097 | ||
4098 | if In_Instance and then Scope (Current_Scope) /= Standard_Standard then | |
d05ef0ab AC |
4099 | Restore_Env; |
4100 | end if; | |
e895b435 ES |
4101 | |
4102 | -- If secondary stk used there is no point in inlining. We have | |
4103 | -- already issued the warning in this case, so nothing to do. | |
4104 | ||
4105 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
4106 | return; | |
4107 | end if; | |
4108 | ||
4109 | Set_Body_To_Inline (Decl, Original_Body); | |
4110 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Subp)); | |
4111 | Set_Is_Inlined (Subp); | |
996ae0b0 RK |
4112 | end Build_Body_To_Inline; |
4113 | ||
fbf5a39b AC |
4114 | ------------------- |
4115 | -- Cannot_Inline -- | |
4116 | ------------------- | |
4117 | ||
84f4072a JM |
4118 | procedure Cannot_Inline |
4119 | (Msg : String; | |
4120 | N : Node_Id; | |
4121 | Subp : Entity_Id; | |
bde73c6b AC |
4122 | Is_Serious : Boolean := False) |
4123 | is | |
fbf5a39b | 4124 | begin |
84f4072a | 4125 | pragma Assert (Msg (Msg'Last) = '?'); |
fbf5a39b | 4126 | |
84f4072a JM |
4127 | -- Old semantics |
4128 | ||
4129 | if not Debug_Flag_Dot_K then | |
4130 | ||
4131 | -- Do not emit warning if this is a predefined unit which is not | |
4132 | -- the main unit. With validity checks enabled, some predefined | |
4133 | -- subprograms may contain nested subprograms and become ineligible | |
4134 | -- for inlining. | |
4135 | ||
4136 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
4137 | and then not In_Extended_Main_Source_Unit (Subp) | |
4138 | then | |
4139 | null; | |
4140 | ||
4141 | elsif Has_Pragma_Inline_Always (Subp) then | |
4142 | ||
4143 | -- Remove last character (question mark) to make this into an | |
4144 | -- error, because the Inline_Always pragma cannot be obeyed. | |
4145 | ||
4146 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); | |
4147 | ||
4148 | elsif Ineffective_Inline_Warnings then | |
4149 | Error_Msg_NE (Msg, N, Subp); | |
4150 | end if; | |
4151 | ||
4152 | return; | |
fbf5a39b | 4153 | |
84f4072a | 4154 | -- New semantics |
e895b435 | 4155 | |
84f4072a JM |
4156 | elsif Is_Serious then |
4157 | ||
4158 | -- Remove last character (question mark) to make this into an error. | |
e895b435 | 4159 | |
ec4867fa | 4160 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); |
fbf5a39b | 4161 | |
84f4072a JM |
4162 | elsif Optimization_Level = 0 then |
4163 | ||
4164 | -- Do not emit warning if this is a predefined unit which is not | |
4165 | -- the main unit. This behavior is currently provided for backward | |
4166 | -- compatibility but it will be removed when we enforce the | |
4167 | -- strictness of the new rules. | |
4168 | ||
4169 | if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp))) | |
4170 | and then not In_Extended_Main_Source_Unit (Subp) | |
4171 | then | |
4172 | null; | |
4173 | ||
4174 | elsif Has_Pragma_Inline_Always (Subp) then | |
4175 | ||
4176 | -- Emit a warning if this is a call to a runtime subprogram | |
4177 | -- which is located inside a generic. Previously this call | |
4178 | -- was silently skipped! | |
4179 | ||
4180 | if Is_Generic_Instance (Subp) then | |
4181 | declare | |
4182 | Gen_P : constant Entity_Id := Generic_Parent (Parent (Subp)); | |
4183 | begin | |
4184 | if Is_Predefined_File_Name | |
4185 | (Unit_File_Name (Get_Source_Unit (Gen_P))) | |
4186 | then | |
4187 | Set_Is_Inlined (Subp, False); | |
4188 | Error_Msg_NE (Msg, N, Subp); | |
4189 | return; | |
4190 | end if; | |
4191 | end; | |
4192 | end if; | |
4193 | ||
4194 | -- Remove last character (question mark) to make this into an | |
4195 | -- error, because the Inline_Always pragma cannot be obeyed. | |
4196 | ||
4197 | Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp); | |
4198 | ||
4199 | else pragma Assert (Front_End_Inlining); | |
4200 | Set_Is_Inlined (Subp, False); | |
4201 | ||
4202 | -- When inlining cannot take place we must issue an error. | |
4203 | -- For backward compatibility we still report a warning. | |
4204 | ||
4205 | if Ineffective_Inline_Warnings then | |
4206 | Error_Msg_NE (Msg, N, Subp); | |
4207 | end if; | |
4208 | end if; | |
4209 | ||
4210 | -- Compiling with optimizations enabled it is too early to report | |
4211 | -- problems since the backend may still perform inlining. In order | |
4212 | -- to report unhandled inlinings the program must be compiled with | |
4213 | -- -Winline and the error is reported by the backend. | |
4214 | ||
4215 | else | |
4216 | null; | |
fbf5a39b AC |
4217 | end if; |
4218 | end Cannot_Inline; | |
4219 | ||
84f4072a JM |
4220 | ------------------------------------ |
4221 | -- Check_And_Build_Body_To_Inline -- | |
4222 | ------------------------------------ | |
4223 | ||
4224 | procedure Check_And_Build_Body_To_Inline | |
4225 | (N : Node_Id; | |
4226 | Spec_Id : Entity_Id; | |
4227 | Body_Id : Entity_Id) | |
4228 | is | |
4229 | procedure Build_Body_To_Inline (N : Node_Id; Spec_Id : Entity_Id); | |
4230 | -- Use generic machinery to build an unexpanded body for the subprogram. | |
4231 | -- This body is subsequently used for inline expansions at call sites. | |
4232 | ||
4233 | function Can_Split_Unconstrained_Function (N : Node_Id) return Boolean; | |
4234 | -- Return true if the function body N has no local declarations and its | |
4235 | -- unique statement is a single extended return statement with a handled | |
4236 | -- statements sequence. | |
4237 | ||
4238 | function Check_Body_To_Inline | |
4239 | (N : Node_Id; | |
4240 | Subp : Entity_Id) return Boolean; | |
4241 | -- N is the N_Subprogram_Body of Subp. Return true if Subp can be | |
4242 | -- inlined by the frontend. These are the rules: | |
4243 | -- * At -O0 use fe inlining when inline_always is specified except if | |
4244 | -- the function returns a controlled type. | |
4245 | -- * At other optimization levels use the fe inlining for both inline | |
4246 | -- and inline_always in the following cases: | |
4247 | -- - function returning a known at compile time constant | |
4248 | -- - function returning a call to an intrinsic function | |
4249 | -- - function returning an unconstrained type (see Can_Split | |
4250 | -- Unconstrained_Function). | |
4251 | -- - function returning a call to a frontend-inlined function | |
4252 | -- Use the back-end mechanism otherwise | |
4253 | -- | |
4254 | -- In addition, in the following cases the function cannot be inlined by | |
4255 | -- the frontend: | |
4256 | -- - functions that uses the secondary stack | |
4257 | -- - functions that have declarations of: | |
4258 | -- - Concurrent types | |
4259 | -- - Packages | |
4260 | -- - Instantiations | |
4261 | -- - Subprograms | |
4262 | -- - functions that have some of the following statements: | |
4263 | -- - abort | |
4264 | -- - asynchronous-select | |
4265 | -- - conditional-entry-call | |
4266 | -- - delay-relative | |
4267 | -- - delay-until | |
4268 | -- - selective-accept | |
4269 | -- - timed-entry-call | |
4270 | -- - functions that have exception handlers | |
4271 | -- - functions that have some enclosing body containing instantiations | |
4272 | -- that appear before the corresponding generic body. | |
4273 | ||
4274 | procedure Generate_Body_To_Inline | |
4275 | (N : Node_Id; | |
4276 | Body_To_Inline : out Node_Id); | |
4277 | -- Generate a parameterless duplicate of subprogram body N. Occurrences | |
4278 | -- of pragmas referencing the formals are removed since they have no | |
4279 | -- meaning when the body is inlined and the formals are rewritten (the | |
4280 | -- analysis of the non-inlined body will handle these pragmas properly). | |
4281 | -- A new internal name is associated with Body_To_Inline. | |
4282 | ||
4283 | procedure Preanalyze (N : Node_Id); | |
4284 | -- Performs a pre-analysis of node N. During pre-analysis no expansion | |
4285 | -- is carried out for N or its children. For more info on pre-analysis | |
4286 | -- read the spec of Sem. | |
4287 | ||
4288 | procedure Split_Unconstrained_Function | |
4289 | (N : Node_Id; | |
4290 | Spec_Id : Entity_Id); | |
4291 | -- N is an inlined function body that returns an unconstrained type and | |
4292 | -- has a single extended return statement. Split N in two subprograms: | |
4293 | -- a procedure P' and a function F'. The formals of P' duplicate the | |
4294 | -- formals of N plus an extra formal which is used return a value; | |
4295 | -- its body is composed by the declarations and list of statements | |
4296 | -- of the extended return statement of N. | |
4297 | ||
4298 | -------------------------- | |
4299 | -- Build_Body_To_Inline -- | |
4300 | -------------------------- | |
4301 | ||
4302 | procedure Build_Body_To_Inline (N : Node_Id; Spec_Id : Entity_Id) is | |
4303 | Decl : constant Node_Id := Unit_Declaration_Node (Spec_Id); | |
4304 | Original_Body : Node_Id; | |
4305 | Body_To_Analyze : Node_Id; | |
4306 | ||
4307 | begin | |
4308 | pragma Assert (Current_Scope = Spec_Id); | |
4309 | ||
4310 | -- Within an instance, the body to inline must be treated as a nested | |
4311 | -- generic, so that the proper global references are preserved. We | |
4312 | -- do not do this at the library level, because it is not needed, and | |
4313 | -- furthermore this causes trouble if front end inlining is activated | |
4314 | -- (-gnatN). | |
4315 | ||
4316 | if In_Instance | |
4317 | and then Scope (Current_Scope) /= Standard_Standard | |
4318 | then | |
4319 | Save_Env (Scope (Current_Scope), Scope (Current_Scope)); | |
4320 | end if; | |
4321 | ||
4322 | -- We need to capture references to the formals in order | |
4323 | -- to substitute the actuals at the point of inlining, i.e. | |
4324 | -- instantiation. To treat the formals as globals to the body to | |
4325 | -- inline, we nest it within a dummy parameterless subprogram, | |
4326 | -- declared within the real one. | |
4327 | ||
4328 | Generate_Body_To_Inline (N, Original_Body); | |
4329 | Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False); | |
4330 | ||
4331 | -- Set return type of function, which is also global and does not | |
4332 | -- need to be resolved. | |
4333 | ||
4334 | if Ekind (Spec_Id) = E_Function then | |
4335 | Set_Result_Definition (Specification (Body_To_Analyze), | |
4336 | New_Occurrence_Of (Etype (Spec_Id), Sloc (N))); | |
4337 | end if; | |
4338 | ||
4339 | if No (Declarations (N)) then | |
4340 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
4341 | else | |
4342 | Append_To (Declarations (N), Body_To_Analyze); | |
4343 | end if; | |
4344 | ||
4345 | Preanalyze (Body_To_Analyze); | |
4346 | ||
4347 | Push_Scope (Defining_Entity (Body_To_Analyze)); | |
4348 | Save_Global_References (Original_Body); | |
4349 | End_Scope; | |
4350 | Remove (Body_To_Analyze); | |
4351 | ||
4352 | -- Restore environment if previously saved | |
4353 | ||
4354 | if In_Instance | |
4355 | and then Scope (Current_Scope) /= Standard_Standard | |
4356 | then | |
4357 | Restore_Env; | |
4358 | end if; | |
4359 | ||
4360 | pragma Assert (No (Body_To_Inline (Decl))); | |
4361 | Set_Body_To_Inline (Decl, Original_Body); | |
4362 | Set_Ekind (Defining_Entity (Original_Body), Ekind (Spec_Id)); | |
4363 | end Build_Body_To_Inline; | |
4364 | ||
4365 | -------------------------- | |
4366 | -- Check_Body_To_Inline -- | |
4367 | -------------------------- | |
4368 | ||
4369 | function Check_Body_To_Inline | |
4370 | (N : Node_Id; | |
4371 | Subp : Entity_Id) return Boolean | |
4372 | is | |
4373 | Max_Size : constant := 10; | |
4374 | Stat_Count : Integer := 0; | |
4375 | ||
4376 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean; | |
4377 | -- Check for declarations that make inlining not worthwhile | |
4378 | ||
4379 | function Has_Excluded_Statement (Stats : List_Id) return Boolean; | |
4380 | -- Check for statements that make inlining not worthwhile: any | |
4381 | -- tasking statement, nested at any level. Keep track of total | |
4382 | -- number of elementary statements, as a measure of acceptable size. | |
4383 | ||
4384 | function Has_Pending_Instantiation return Boolean; | |
4385 | -- Return True if some enclosing body contains instantiations that | |
4386 | -- appear before the corresponding generic body. | |
4387 | ||
4388 | function Returns_Compile_Time_Constant (N : Node_Id) return Boolean; | |
4389 | -- Return True if all the return statements of the function body N | |
4390 | -- are simple return statements and return a compile time constant | |
4391 | ||
4392 | function Returns_Intrinsic_Function_Call (N : Node_Id) return Boolean; | |
4393 | -- Return True if all the return statements of the function body N | |
4394 | -- are simple return statements and return an intrinsic function call | |
4395 | ||
4396 | function Uses_Secondary_Stack (N : Node_Id) return Boolean; | |
4397 | -- If the body of the subprogram includes a call that returns an | |
4398 | -- unconstrained type, the secondary stack is involved, and it | |
4399 | -- is not worth inlining. | |
4400 | ||
4401 | ------------------------------ | |
4402 | -- Has_Excluded_Declaration -- | |
4403 | ------------------------------ | |
4404 | ||
4405 | function Has_Excluded_Declaration (Decls : List_Id) return Boolean is | |
4406 | D : Node_Id; | |
4407 | ||
4408 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean; | |
4409 | -- Nested subprograms make a given body ineligible for inlining, | |
4410 | -- but we make an exception for instantiations of unchecked | |
4411 | -- conversion. The body has not been analyzed yet, so check the | |
4412 | -- name, and verify that the visible entity with that name is the | |
4413 | -- predefined unit. | |
4414 | ||
4415 | ----------------------------- | |
4416 | -- Is_Unchecked_Conversion -- | |
4417 | ----------------------------- | |
4418 | ||
4419 | function Is_Unchecked_Conversion (D : Node_Id) return Boolean is | |
4420 | Id : constant Node_Id := Name (D); | |
4421 | Conv : Entity_Id; | |
4422 | ||
4423 | begin | |
4424 | if Nkind (Id) = N_Identifier | |
4425 | and then Chars (Id) = Name_Unchecked_Conversion | |
4426 | then | |
4427 | Conv := Current_Entity (Id); | |
4428 | ||
4429 | elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name) | |
4430 | and then Chars (Selector_Name (Id)) | |
4431 | = Name_Unchecked_Conversion | |
4432 | then | |
4433 | Conv := Current_Entity (Selector_Name (Id)); | |
4434 | else | |
4435 | return False; | |
4436 | end if; | |
4437 | ||
4438 | return Present (Conv) | |
4439 | and then Is_Predefined_File_Name | |
4440 | (Unit_File_Name (Get_Source_Unit (Conv))) | |
4441 | and then Is_Intrinsic_Subprogram (Conv); | |
4442 | end Is_Unchecked_Conversion; | |
4443 | ||
4444 | -- Start of processing for Has_Excluded_Declaration | |
4445 | ||
4446 | begin | |
4447 | D := First (Decls); | |
4448 | while Present (D) loop | |
4449 | if (Nkind (D) = N_Function_Instantiation | |
4450 | and then not Is_Unchecked_Conversion (D)) | |
4451 | or else Nkind_In (D, N_Protected_Type_Declaration, | |
4452 | N_Package_Declaration, | |
4453 | N_Package_Instantiation, | |
4454 | N_Subprogram_Body, | |
4455 | N_Procedure_Instantiation, | |
4456 | N_Task_Type_Declaration) | |
4457 | then | |
4458 | Cannot_Inline | |
4459 | ("cannot inline & (non-allowed declaration)?", D, Subp); | |
4460 | ||
4461 | return True; | |
4462 | end if; | |
4463 | ||
4464 | Next (D); | |
4465 | end loop; | |
4466 | ||
4467 | return False; | |
4468 | end Has_Excluded_Declaration; | |
4469 | ||
4470 | ---------------------------- | |
4471 | -- Has_Excluded_Statement -- | |
4472 | ---------------------------- | |
4473 | ||
4474 | function Has_Excluded_Statement (Stats : List_Id) return Boolean is | |
4475 | S : Node_Id; | |
4476 | E : Node_Id; | |
4477 | ||
4478 | begin | |
4479 | S := First (Stats); | |
4480 | while Present (S) loop | |
4481 | Stat_Count := Stat_Count + 1; | |
4482 | ||
4483 | if Nkind_In (S, N_Abort_Statement, | |
4484 | N_Asynchronous_Select, | |
4485 | N_Conditional_Entry_Call, | |
4486 | N_Delay_Relative_Statement, | |
4487 | N_Delay_Until_Statement, | |
4488 | N_Selective_Accept, | |
4489 | N_Timed_Entry_Call) | |
4490 | then | |
4491 | Cannot_Inline | |
4492 | ("cannot inline & (non-allowed statement)?", S, Subp); | |
4493 | return True; | |
4494 | ||
4495 | elsif Nkind (S) = N_Block_Statement then | |
4496 | if Present (Declarations (S)) | |
4497 | and then Has_Excluded_Declaration (Declarations (S)) | |
4498 | then | |
4499 | return True; | |
4500 | ||
4501 | elsif Present (Handled_Statement_Sequence (S)) then | |
4502 | if Present | |
4503 | (Exception_Handlers (Handled_Statement_Sequence (S))) | |
4504 | then | |
4505 | Cannot_Inline | |
4506 | ("cannot inline& (exception handler)?", | |
4507 | First (Exception_Handlers | |
4508 | (Handled_Statement_Sequence (S))), | |
4509 | Subp); | |
4510 | return True; | |
4511 | ||
4512 | elsif Has_Excluded_Statement | |
4513 | (Statements (Handled_Statement_Sequence (S))) | |
4514 | then | |
4515 | return True; | |
4516 | end if; | |
4517 | end if; | |
4518 | ||
4519 | elsif Nkind (S) = N_Case_Statement then | |
4520 | E := First (Alternatives (S)); | |
4521 | while Present (E) loop | |
4522 | if Has_Excluded_Statement (Statements (E)) then | |
4523 | return True; | |
4524 | end if; | |
4525 | ||
4526 | Next (E); | |
4527 | end loop; | |
4528 | ||
4529 | elsif Nkind (S) = N_If_Statement then | |
4530 | if Has_Excluded_Statement (Then_Statements (S)) then | |
4531 | return True; | |
4532 | end if; | |
4533 | ||
4534 | if Present (Elsif_Parts (S)) then | |
4535 | E := First (Elsif_Parts (S)); | |
4536 | while Present (E) loop | |
4537 | if Has_Excluded_Statement (Then_Statements (E)) then | |
4538 | return True; | |
4539 | end if; | |
4540 | Next (E); | |
4541 | end loop; | |
4542 | end if; | |
4543 | ||
4544 | if Present (Else_Statements (S)) | |
4545 | and then Has_Excluded_Statement (Else_Statements (S)) | |
4546 | then | |
4547 | return True; | |
4548 | end if; | |
4549 | ||
4550 | elsif Nkind (S) = N_Loop_Statement | |
4551 | and then Has_Excluded_Statement (Statements (S)) | |
4552 | then | |
4553 | return True; | |
4554 | ||
4555 | elsif Nkind (S) = N_Extended_Return_Statement then | |
4556 | if Present (Handled_Statement_Sequence (S)) | |
4557 | and then | |
4558 | Has_Excluded_Statement | |
4559 | (Statements (Handled_Statement_Sequence (S))) | |
4560 | then | |
4561 | return True; | |
4562 | ||
4563 | elsif Present (Handled_Statement_Sequence (S)) | |
4564 | and then | |
4565 | Present (Exception_Handlers | |
4566 | (Handled_Statement_Sequence (S))) | |
4567 | then | |
4568 | Cannot_Inline | |
4569 | ("cannot inline& (exception handler)?", | |
4570 | First (Exception_Handlers | |
4571 | (Handled_Statement_Sequence (S))), | |
4572 | Subp); | |
4573 | return True; | |
4574 | end if; | |
4575 | end if; | |
4576 | ||
4577 | Next (S); | |
4578 | end loop; | |
4579 | ||
4580 | return False; | |
4581 | end Has_Excluded_Statement; | |
4582 | ||
4583 | ------------------------------- | |
4584 | -- Has_Pending_Instantiation -- | |
4585 | ------------------------------- | |
4586 | ||
4587 | function Has_Pending_Instantiation return Boolean is | |
4588 | S : Entity_Id; | |
4589 | ||
4590 | begin | |
4591 | S := Current_Scope; | |
4592 | while Present (S) loop | |
4593 | if Is_Compilation_Unit (S) | |
4594 | or else Is_Child_Unit (S) | |
4595 | then | |
4596 | return False; | |
4597 | ||
4598 | elsif Ekind (S) = E_Package | |
4599 | and then Has_Forward_Instantiation (S) | |
4600 | then | |
4601 | return True; | |
4602 | end if; | |
4603 | ||
4604 | S := Scope (S); | |
4605 | end loop; | |
4606 | ||
4607 | return False; | |
4608 | end Has_Pending_Instantiation; | |
4609 | ||
4610 | ------------------------------------ | |
4611 | -- Returns_Compile_Time_Constant -- | |
4612 | ------------------------------------ | |
4613 | ||
4614 | function Returns_Compile_Time_Constant (N : Node_Id) return Boolean is | |
4615 | ||
4616 | function Check_Return (N : Node_Id) return Traverse_Result; | |
4617 | ||
4618 | ------------------ | |
4619 | -- Check_Return -- | |
4620 | ------------------ | |
4621 | ||
4622 | function Check_Return (N : Node_Id) return Traverse_Result is | |
4623 | begin | |
4624 | if Nkind (N) = N_Extended_Return_Statement then | |
4625 | return Abandon; | |
4626 | ||
4627 | elsif Nkind (N) = N_Simple_Return_Statement then | |
4628 | if Present (Expression (N)) then | |
4629 | declare | |
4630 | Orig_Expr : constant Node_Id := | |
4631 | Original_Node (Expression (N)); | |
4632 | ||
4633 | begin | |
4634 | if Nkind_In (Orig_Expr, N_Integer_Literal, | |
4635 | N_Real_Literal, | |
4636 | N_Character_Literal) | |
4637 | then | |
4638 | return OK; | |
4639 | ||
4640 | elsif Is_Entity_Name (Orig_Expr) | |
4641 | and then Ekind (Entity (Orig_Expr)) = E_Constant | |
4642 | and then Is_Static_Expression (Orig_Expr) | |
4643 | then | |
4644 | return OK; | |
4645 | else | |
4646 | return Abandon; | |
4647 | end if; | |
4648 | end; | |
4649 | ||
4650 | -- Expression has wrong form | |
4651 | ||
4652 | else | |
4653 | return Abandon; | |
4654 | end if; | |
4655 | ||
4656 | -- Continue analyzing statements | |
4657 | ||
4658 | else | |
4659 | return OK; | |
4660 | end if; | |
4661 | end Check_Return; | |
4662 | ||
4663 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
4664 | ||
4665 | -- Start of processing for Returns_Compile_Time_Constant | |
4666 | ||
4667 | begin | |
4668 | return Check_All_Returns (N) = OK; | |
4669 | end Returns_Compile_Time_Constant; | |
4670 | ||
4671 | -------------------------------------- | |
4672 | -- Returns_Intrinsic_Function_Call -- | |
4673 | -------------------------------------- | |
4674 | ||
4675 | function Returns_Intrinsic_Function_Call | |
4676 | (N : Node_Id) return Boolean | |
4677 | is | |
4678 | function Check_Return (N : Node_Id) return Traverse_Result; | |
4679 | ||
4680 | ------------------ | |
4681 | -- Check_Return -- | |
4682 | ------------------ | |
4683 | ||
4684 | function Check_Return (N : Node_Id) return Traverse_Result is | |
4685 | begin | |
4686 | if Nkind (N) = N_Extended_Return_Statement then | |
4687 | return Abandon; | |
4688 | ||
4689 | elsif Nkind (N) = N_Simple_Return_Statement then | |
4690 | if Present (Expression (N)) then | |
4691 | declare | |
4692 | Orig_Expr : constant Node_Id := | |
4693 | Original_Node (Expression (N)); | |
4694 | ||
4695 | begin | |
4696 | if Nkind (Orig_Expr) in N_Op | |
4697 | and then Is_Intrinsic_Subprogram (Entity (Orig_Expr)) | |
4698 | then | |
4699 | return OK; | |
4700 | ||
4701 | elsif Nkind (Orig_Expr) in N_Has_Entity | |
4702 | and then Present (Entity (Orig_Expr)) | |
4703 | and then Ekind (Entity (Orig_Expr)) = E_Function | |
4704 | and then Is_Inlined (Entity (Orig_Expr)) | |
4705 | then | |
4706 | return OK; | |
4707 | ||
4708 | elsif Nkind (Orig_Expr) in N_Has_Entity | |
4709 | and then Present (Entity (Orig_Expr)) | |
4710 | and then Is_Intrinsic_Subprogram (Entity (Orig_Expr)) | |
4711 | then | |
4712 | return OK; | |
4713 | ||
4714 | else | |
4715 | return Abandon; | |
4716 | end if; | |
4717 | end; | |
4718 | ||
4719 | -- Expression has wrong form | |
4720 | ||
4721 | else | |
4722 | return Abandon; | |
4723 | end if; | |
4724 | ||
4725 | -- Continue analyzing statements | |
4726 | ||
4727 | else | |
4728 | return OK; | |
4729 | end if; | |
4730 | end Check_Return; | |
4731 | ||
4732 | function Check_All_Returns is new Traverse_Func (Check_Return); | |
4733 | ||
4734 | -- Start of processing for Returns_Intrinsic_Function_Call | |
4735 | ||
4736 | begin | |
4737 | return Check_All_Returns (N) = OK; | |
4738 | end Returns_Intrinsic_Function_Call; | |
4739 | ||
4740 | -------------------------- | |
4741 | -- Uses_Secondary_Stack -- | |
4742 | -------------------------- | |
4743 | ||
4744 | function Uses_Secondary_Stack (N : Node_Id) return Boolean is | |
4745 | ||
4746 | function Check_Call (N : Node_Id) return Traverse_Result; | |
4747 | -- Look for function calls that return an unconstrained type | |
4748 | ||
4749 | ---------------- | |
4750 | -- Check_Call -- | |
4751 | ---------------- | |
4752 | ||
4753 | function Check_Call (N : Node_Id) return Traverse_Result is | |
4754 | begin | |
4755 | if Nkind (N) = N_Function_Call | |
4756 | and then Is_Entity_Name (Name (N)) | |
4757 | and then Is_Composite_Type (Etype (Entity (Name (N)))) | |
4758 | and then not Is_Constrained (Etype (Entity (Name (N)))) | |
4759 | then | |
4760 | Cannot_Inline | |
4761 | ("cannot inline & (call returns unconstrained type)?", | |
4762 | N, Subp); | |
4763 | ||
4764 | return Abandon; | |
4765 | else | |
4766 | return OK; | |
4767 | end if; | |
4768 | end Check_Call; | |
4769 | ||
4770 | function Check_Calls is new Traverse_Func (Check_Call); | |
4771 | ||
4772 | -- Start of processing for Uses_Secondary_Stack | |
4773 | ||
4774 | begin | |
4775 | return Check_Calls (N) = Abandon; | |
4776 | end Uses_Secondary_Stack; | |
4777 | ||
4778 | -- Local variables | |
4779 | ||
4780 | Decl : constant Node_Id := Unit_Declaration_Node (Spec_Id); | |
4781 | May_Inline : constant Boolean := | |
4782 | Has_Pragma_Inline_Always (Spec_Id) | |
4783 | or else (Has_Pragma_Inline (Spec_Id) | |
4784 | and then ((Optimization_Level > 0 | |
4785 | and then Ekind (Spec_Id) | |
4786 | = E_Function) | |
4787 | or else Front_End_Inlining)); | |
4788 | Body_To_Analyze : Node_Id; | |
4789 | ||
4790 | -- Start of processing for Check_Body_To_Inline | |
4791 | ||
4792 | begin | |
4793 | -- No action needed in stubs since the attribute Body_To_Inline | |
4794 | -- is not available | |
4795 | ||
4796 | if Nkind (Decl) = N_Subprogram_Body_Stub then | |
4797 | return False; | |
4798 | ||
4799 | -- Cannot build the body to inline if the attribute is already set. | |
4800 | -- This attribute may have been set if this is a subprogram renaming | |
4801 | -- declarations (see Freeze.Build_Renamed_Body). | |
4802 | ||
4803 | elsif Present (Body_To_Inline (Decl)) then | |
4804 | return False; | |
4805 | ||
4806 | -- No action needed if the subprogram does not fulfill the minimum | |
4807 | -- conditions to be inlined by the frontend | |
4808 | ||
4809 | elsif not May_Inline then | |
4810 | return False; | |
4811 | end if; | |
4812 | ||
4813 | -- Check excluded declarations | |
4814 | ||
4815 | if Present (Declarations (N)) | |
4816 | and then Has_Excluded_Declaration (Declarations (N)) | |
4817 | then | |
4818 | return False; | |
4819 | end if; | |
4820 | ||
4821 | -- Check excluded statements | |
4822 | ||
4823 | if Present (Handled_Statement_Sequence (N)) then | |
4824 | if Present | |
4825 | (Exception_Handlers (Handled_Statement_Sequence (N))) | |
4826 | then | |
4827 | Cannot_Inline | |
4828 | ("cannot inline& (exception handler)?", | |
4829 | First | |
4830 | (Exception_Handlers (Handled_Statement_Sequence (N))), | |
4831 | Subp); | |
4832 | ||
4833 | return False; | |
4834 | ||
4835 | elsif Has_Excluded_Statement | |
4836 | (Statements (Handled_Statement_Sequence (N))) | |
4837 | then | |
4838 | return False; | |
4839 | end if; | |
4840 | end if; | |
4841 | ||
4842 | -- For backward compatibility, compiling under -gnatN we do not | |
4843 | -- inline a subprogram that is too large, unless it is marked | |
4844 | -- Inline_Always. This pragma does not suppress the other checks | |
4845 | -- on inlining (forbidden declarations, handlers, etc). | |
4846 | ||
4847 | if Front_End_Inlining | |
4848 | and then not Has_Pragma_Inline_Always (Subp) | |
4849 | and then Stat_Count > Max_Size | |
4850 | then | |
4851 | Cannot_Inline ("cannot inline& (body too large)?", N, Subp); | |
4852 | return False; | |
4853 | end if; | |
4854 | ||
4855 | -- If some enclosing body contains instantiations that appear before | |
4856 | -- the corresponding generic body, the enclosing body has a freeze | |
4857 | -- node so that it can be elaborated after the generic itself. This | |
4858 | -- might conflict with subsequent inlinings, so that it is unsafe to | |
4859 | -- try to inline in such a case. | |
4860 | ||
4861 | if Has_Pending_Instantiation then | |
4862 | Cannot_Inline | |
4863 | ("cannot inline& (forward instance within enclosing body)?", | |
4864 | N, Subp); | |
4865 | ||
4866 | return False; | |
4867 | end if; | |
4868 | ||
4869 | -- Generate and preanalyze the body to inline (needed to perform | |
4870 | -- the rest of the checks) | |
4871 | ||
4872 | Generate_Body_To_Inline (N, Body_To_Analyze); | |
4873 | ||
4874 | if Ekind (Subp) = E_Function then | |
4875 | Set_Result_Definition (Specification (Body_To_Analyze), | |
4876 | New_Occurrence_Of (Etype (Subp), Sloc (N))); | |
4877 | end if; | |
4878 | ||
4879 | -- Nest the body to analyze within the real one | |
4880 | ||
4881 | if No (Declarations (N)) then | |
4882 | Set_Declarations (N, New_List (Body_To_Analyze)); | |
4883 | else | |
4884 | Append_To (Declarations (N), Body_To_Analyze); | |
4885 | end if; | |
4886 | ||
4887 | Preanalyze (Body_To_Analyze); | |
4888 | Remove (Body_To_Analyze); | |
4889 | ||
4890 | -- Keep separate checks needed when compiling without optimizations | |
ea3a4ad0 JM |
4891 | -- AAMP and VM targets have no support for inlining in the backend |
4892 | -- and hence we use frontend inlining at all optimization levels. | |
84f4072a | 4893 | |
ea3a4ad0 JM |
4894 | if Optimization_Level = 0 |
4895 | or else AAMP_On_Target | |
4896 | or else VM_Target /= No_VM | |
4897 | then | |
84f4072a JM |
4898 | -- Cannot inline functions whose body has a call that returns an |
4899 | -- unconstrained type since the secondary stack is involved, and | |
4900 | -- it is not worth inlining. | |
4901 | ||
4902 | if Uses_Secondary_Stack (Body_To_Analyze) then | |
4903 | return False; | |
4904 | ||
4905 | -- Cannot inline functions that return controlled types since | |
4906 | -- controlled actions interfere in complex ways with inlining. | |
4907 | ||
4908 | elsif Ekind (Subp) = E_Function | |
4909 | and then Needs_Finalization (Etype (Subp)) | |
4910 | then | |
4911 | Cannot_Inline | |
4912 | ("cannot inline & (controlled return type)?", N, Subp); | |
4913 | return False; | |
4914 | ||
4915 | elsif Returns_Unconstrained_Type (Subp) then | |
4916 | Cannot_Inline | |
4917 | ("cannot inline & (unconstrained return type)?", N, Subp); | |
4918 | return False; | |
4919 | end if; | |
4920 | ||
4921 | -- Compiling with optimizations enabled | |
4922 | ||
4923 | else | |
4924 | -- Procedures are never frontend inlined in this case! | |
4925 | ||
4926 | if Ekind (Subp) /= E_Function then | |
4927 | return False; | |
4928 | ||
4929 | -- Functions returning unconstrained types are tested | |
4930 | -- separately (see Can_Split_Unconstrained_Function). | |
4931 | ||
4932 | elsif Returns_Unconstrained_Type (Subp) then | |
4933 | null; | |
4934 | ||
4935 | -- Check supported cases | |
4936 | ||
4937 | elsif not Returns_Compile_Time_Constant (Body_To_Analyze) | |
4938 | and then Convention (Subp) /= Convention_Intrinsic | |
4939 | and then not Returns_Intrinsic_Function_Call (Body_To_Analyze) | |
4940 | then | |
4941 | return False; | |
4942 | end if; | |
4943 | end if; | |
4944 | ||
4945 | return True; | |
4946 | end Check_Body_To_Inline; | |
4947 | ||
4948 | -------------------------------------- | |
4949 | -- Can_Split_Unconstrained_Function -- | |
4950 | -------------------------------------- | |
4951 | ||
4952 | function Can_Split_Unconstrained_Function (N : Node_Id) return Boolean | |
4953 | is | |
4954 | Ret_Node : constant Node_Id := | |
4955 | First (Statements (Handled_Statement_Sequence (N))); | |
4956 | D : Node_Id; | |
4957 | ||
4958 | begin | |
4959 | -- No user defined declarations allowed in the function except inside | |
4960 | -- the unique return statement; implicit labels are the only allowed | |
4961 | -- declarations. | |
4962 | ||
4963 | if not Is_Empty_List (Declarations (N)) then | |
4964 | D := First (Declarations (N)); | |
4965 | while Present (D) loop | |
4966 | if Nkind (D) /= N_Implicit_Label_Declaration then | |
4967 | return False; | |
4968 | end if; | |
4969 | ||
4970 | Next (D); | |
4971 | end loop; | |
4972 | end if; | |
4973 | ||
4974 | return Present (Ret_Node) | |
4975 | and then Nkind (Ret_Node) = N_Extended_Return_Statement | |
4976 | and then No (Next (Ret_Node)) | |
4977 | and then Present (Handled_Statement_Sequence (Ret_Node)); | |
4978 | end Can_Split_Unconstrained_Function; | |
4979 | ||
4980 | ----------------------------- | |
4981 | -- Generate_Body_To_Inline -- | |
4982 | ----------------------------- | |
4983 | ||
4984 | procedure Generate_Body_To_Inline | |
4985 | (N : Node_Id; | |
4986 | Body_To_Inline : out Node_Id) | |
4987 | is | |
4988 | procedure Remove_Pragmas (N : Node_Id); | |
4989 | -- Remove occurrences of pragmas that may reference the formals of | |
4990 | -- N. The analysis of the non-inlined body will handle these pragmas | |
4991 | -- properly. | |
4992 | ||
4993 | -------------------- | |
4994 | -- Remove_Pragmas -- | |
4995 | -------------------- | |
4996 | ||
4997 | procedure Remove_Pragmas (N : Node_Id) is | |
4998 | Decl : Node_Id; | |
4999 | Nxt : Node_Id; | |
5000 | ||
5001 | begin | |
5002 | Decl := First (Declarations (N)); | |
5003 | while Present (Decl) loop | |
5004 | Nxt := Next (Decl); | |
5005 | ||
5006 | if Nkind (Decl) = N_Pragma | |
5007 | and then (Pragma_Name (Decl) = Name_Unreferenced | |
5008 | or else | |
5009 | Pragma_Name (Decl) = Name_Unmodified) | |
5010 | then | |
5011 | Remove (Decl); | |
5012 | end if; | |
5013 | ||
5014 | Decl := Nxt; | |
5015 | end loop; | |
5016 | end Remove_Pragmas; | |
5017 | ||
5018 | -- Start of processing for Generate_Body_To_Inline | |
5019 | ||
5020 | begin | |
5021 | -- Within an instance, the body to inline must be treated as a nested | |
5022 | -- generic, so that the proper global references are preserved. | |
5023 | ||
5024 | -- Note that we do not do this at the library level, because it | |
5025 | -- is not needed, and furthermore this causes trouble if front | |
5026 | -- end inlining is activated (-gnatN). | |
5027 | ||
5028 | if In_Instance | |
5029 | and then Scope (Current_Scope) /= Standard_Standard | |
5030 | then | |
5031 | Body_To_Inline := Copy_Generic_Node (N, Empty, True); | |
5032 | else | |
5033 | Body_To_Inline := Copy_Separate_Tree (N); | |
5034 | end if; | |
5035 | ||
5036 | -- A pragma Unreferenced or pragma Unmodified that mentions a formal | |
5037 | -- parameter has no meaning when the body is inlined and the formals | |
5038 | -- are rewritten. Remove it from body to inline. The analysis of the | |
5039 | -- non-inlined body will handle the pragma properly. | |
5040 | ||
5041 | Remove_Pragmas (Body_To_Inline); | |
5042 | ||
5043 | -- We need to capture references to the formals in order | |
5044 | -- to substitute the actuals at the point of inlining, i.e. | |
5045 | -- instantiation. To treat the formals as globals to the body to | |
5046 | -- inline, we nest it within a dummy parameterless subprogram, | |
5047 | -- declared within the real one. | |
5048 | ||
5049 | Set_Parameter_Specifications | |
5050 | (Specification (Body_To_Inline), No_List); | |
5051 | ||
5052 | -- A new internal name is associated with Body_To_Inline to avoid | |
5053 | -- conflicts when the non-inlined body N is analyzed. | |
5054 | ||
5055 | Set_Defining_Unit_Name (Specification (Body_To_Inline), | |
5056 | Make_Defining_Identifier (Sloc (N), New_Internal_Name ('P'))); | |
5057 | Set_Corresponding_Spec (Body_To_Inline, Empty); | |
5058 | end Generate_Body_To_Inline; | |
5059 | ||
5060 | ---------------- | |
5061 | -- Preanalyze -- | |
5062 | ---------------- | |
5063 | ||
5064 | procedure Preanalyze (N : Node_Id) is | |
5065 | Save_Full_Analysis : constant Boolean := Full_Analysis; | |
5066 | ||
5067 | begin | |
5068 | Full_Analysis := False; | |
5069 | Expander_Mode_Save_And_Set (False); | |
5070 | ||
5071 | Analyze (N); | |
5072 | ||
5073 | Expander_Mode_Restore; | |
5074 | Full_Analysis := Save_Full_Analysis; | |
5075 | end Preanalyze; | |
5076 | ||
5077 | ---------------------------------- | |
5078 | -- Split_Unconstrained_Function -- | |
5079 | ---------------------------------- | |
5080 | ||
5081 | procedure Split_Unconstrained_Function | |
5082 | (N : Node_Id; | |
5083 | Spec_Id : Entity_Id) | |
5084 | is | |
5085 | Loc : constant Source_Ptr := Sloc (N); | |
5086 | Ret_Node : constant Node_Id := | |
5087 | First (Statements (Handled_Statement_Sequence (N))); | |
5088 | Ret_Obj : constant Node_Id := | |
5089 | First (Return_Object_Declarations (Ret_Node)); | |
5090 | ||
5091 | procedure Build_Procedure | |
5092 | (Proc_Id : out Entity_Id; | |
5093 | Decl_List : out List_Id); | |
5094 | -- Build a procedure containing the statements found in the extended | |
5095 | -- return statement of the unconstrained function body N. | |
5096 | ||
5097 | procedure Build_Procedure | |
5098 | (Proc_Id : out Entity_Id; | |
5099 | Decl_List : out List_Id) | |
5100 | is | |
5101 | Formal : Entity_Id; | |
5102 | Formal_List : constant List_Id := New_List; | |
5103 | Proc_Spec : Node_Id; | |
5104 | Proc_Body : Node_Id; | |
5105 | Subp_Name : constant Name_Id := New_Internal_Name ('F'); | |
5106 | Body_Decl_List : List_Id := No_List; | |
5107 | Param_Type : Node_Id; | |
5108 | ||
5109 | begin | |
5110 | if Nkind (Object_Definition (Ret_Obj)) = N_Identifier then | |
5111 | Param_Type := New_Copy (Object_Definition (Ret_Obj)); | |
5112 | else | |
5113 | Param_Type := | |
5114 | New_Copy (Subtype_Mark (Object_Definition (Ret_Obj))); | |
5115 | end if; | |
5116 | ||
5117 | Append_To (Formal_List, | |
5118 | Make_Parameter_Specification (Loc, | |
5119 | Defining_Identifier => | |
5120 | Make_Defining_Identifier (Loc, | |
5121 | Chars => Chars (Defining_Identifier (Ret_Obj))), | |
5122 | In_Present => False, | |
5123 | Out_Present => True, | |
5124 | Null_Exclusion_Present => False, | |
5125 | Parameter_Type => Param_Type)); | |
5126 | ||
5127 | Formal := First_Formal (Spec_Id); | |
5128 | while Present (Formal) loop | |
5129 | Append_To (Formal_List, | |
5130 | Make_Parameter_Specification (Loc, | |
5131 | Defining_Identifier => | |
5132 | Make_Defining_Identifier (Sloc (Formal), | |
5133 | Chars => Chars (Formal)), | |
5134 | In_Present => In_Present (Parent (Formal)), | |
5135 | Out_Present => Out_Present (Parent (Formal)), | |
5136 | Null_Exclusion_Present => | |
5137 | Null_Exclusion_Present (Parent (Formal)), | |
5138 | Parameter_Type => | |
5139 | New_Reference_To (Etype (Formal), Loc), | |
5140 | Expression => | |
5141 | Copy_Separate_Tree (Expression (Parent (Formal))))); | |
5142 | ||
5143 | Next_Formal (Formal); | |
5144 | end loop; | |
5145 | ||
5146 | Proc_Id := | |
5147 | Make_Defining_Identifier (Loc, Chars => Subp_Name); | |
5148 | ||
5149 | Proc_Spec := | |
5150 | Make_Procedure_Specification (Loc, | |
5151 | Defining_Unit_Name => Proc_Id, | |
5152 | Parameter_Specifications => Formal_List); | |
5153 | ||
5154 | Decl_List := New_List; | |
5155 | ||
5156 | Append_To (Decl_List, | |
5157 | Make_Subprogram_Declaration (Loc, Proc_Spec)); | |
5158 | ||
5159 | -- Can_Convert_Unconstrained_Function checked that the function | |
5160 | -- has no local declarations except implicit label declarations. | |
5161 | -- Copy these declarations to the built procedure. | |
5162 | ||
5163 | if Present (Declarations (N)) then | |
5164 | Body_Decl_List := New_List; | |
5165 | ||
5166 | declare | |
5167 | D : Node_Id; | |
5168 | New_D : Node_Id; | |
5169 | ||
5170 | begin | |
5171 | D := First (Declarations (N)); | |
5172 | while Present (D) loop | |
5173 | pragma Assert (Nkind (D) = N_Implicit_Label_Declaration); | |
5174 | ||
5175 | New_D := | |
5176 | Make_Implicit_Label_Declaration (Loc, | |
5177 | Make_Defining_Identifier (Loc, | |
5178 | Chars => Chars (Defining_Identifier (D))), | |
5179 | Label_Construct => Empty); | |
5180 | Append_To (Body_Decl_List, New_D); | |
5181 | ||
5182 | Next (D); | |
5183 | end loop; | |
5184 | end; | |
5185 | end if; | |
5186 | ||
5187 | pragma Assert (Present (Handled_Statement_Sequence (Ret_Node))); | |
5188 | ||
5189 | Proc_Body := | |
5190 | Make_Subprogram_Body (Loc, | |
5191 | Specification => Copy_Separate_Tree (Proc_Spec), | |
5192 | Declarations => Body_Decl_List, | |
5193 | Handled_Statement_Sequence => | |
5194 | Copy_Separate_Tree (Handled_Statement_Sequence (Ret_Node))); | |
5195 | ||
5196 | Set_Defining_Unit_Name (Specification (Proc_Body), | |
5197 | Make_Defining_Identifier (Loc, Subp_Name)); | |
5198 | ||
5199 | Append_To (Decl_List, Proc_Body); | |
5200 | end Build_Procedure; | |
5201 | ||
5202 | -- Local variables | |
5203 | ||
5204 | New_Obj : constant Node_Id := Copy_Separate_Tree (Ret_Obj); | |
5205 | Blk_Stmt : Node_Id; | |
5206 | Proc_Id : Entity_Id; | |
5207 | Proc_Call : Node_Id; | |
5208 | ||
5209 | -- Start of processing for Split_Unconstrained_Function | |
5210 | ||
5211 | begin | |
5212 | -- Build the associated procedure, analyze it and insert it before | |
5213 | -- the function body N | |
5214 | ||
5215 | declare | |
5216 | Scope : constant Entity_Id := Current_Scope; | |
5217 | Decl_List : List_Id; | |
5218 | begin | |
5219 | Pop_Scope; | |
5220 | Build_Procedure (Proc_Id, Decl_List); | |
5221 | Insert_Actions (N, Decl_List); | |
5222 | Push_Scope (Scope); | |
5223 | end; | |
5224 | ||
5225 | -- Build the call to the generated procedure | |
5226 | ||
5227 | declare | |
5228 | Actual_List : constant List_Id := New_List; | |
5229 | Formal : Entity_Id; | |
5230 | ||
5231 | begin | |
5232 | Append_To (Actual_List, | |
5233 | New_Reference_To (Defining_Identifier (New_Obj), Loc)); | |
5234 | ||
5235 | Formal := First_Formal (Spec_Id); | |
5236 | while Present (Formal) loop | |
5237 | Append_To (Actual_List, New_Reference_To (Formal, Loc)); | |
5238 | ||
5239 | -- Avoid spurious warning on unreferenced formals | |
5240 | ||
5241 | Set_Referenced (Formal); | |
5242 | Next_Formal (Formal); | |
5243 | end loop; | |
5244 | ||
5245 | Proc_Call := | |
5246 | Make_Procedure_Call_Statement (Loc, | |
5247 | Name => New_Reference_To (Proc_Id, Loc), | |
5248 | Parameter_Associations => Actual_List); | |
5249 | end; | |
5250 | ||
5251 | -- Generate | |
5252 | ||
5253 | -- declare | |
5254 | -- New_Obj : ... | |
5255 | -- begin | |
5256 | -- main_1__F1b (New_Obj, ...); | |
5257 | -- return Obj; | |
5258 | -- end B10b; | |
5259 | ||
5260 | Blk_Stmt := | |
5261 | Make_Block_Statement (Loc, | |
5262 | Declarations => New_List (New_Obj), | |
5263 | Handled_Statement_Sequence => | |
5264 | Make_Handled_Sequence_Of_Statements (Loc, | |
5265 | Statements => New_List ( | |
5266 | ||
5267 | Proc_Call, | |
5268 | ||
5269 | Make_Simple_Return_Statement (Loc, | |
5270 | Expression => | |
5271 | New_Reference_To | |
5272 | (Defining_Identifier (New_Obj), Loc))))); | |
5273 | ||
5274 | Rewrite (Ret_Node, Blk_Stmt); | |
5275 | end Split_Unconstrained_Function; | |
5276 | ||
5277 | -- Start of processing for Check_And_Build_Body_To_Inline | |
5278 | ||
5279 | begin | |
5280 | -- Do not inline any subprogram that contains nested subprograms, since | |
5281 | -- the backend inlining circuit seems to generate uninitialized | |
5282 | -- references in this case. We know this happens in the case of front | |
5283 | -- end ZCX support, but it also appears it can happen in other cases as | |
5284 | -- well. The backend often rejects attempts to inline in the case of | |
5285 | -- nested procedures anyway, so little if anything is lost by this. | |
5286 | -- Note that this is test is for the benefit of the back-end. There is | |
5287 | -- a separate test for front-end inlining that also rejects nested | |
5288 | -- subprograms. | |
5289 | ||
5290 | -- Do not do this test if errors have been detected, because in some | |
5291 | -- error cases, this code blows up, and we don't need it anyway if | |
5292 | -- there have been errors, since we won't get to the linker anyway. | |
5293 | ||
5294 | if Comes_From_Source (Body_Id) | |
5295 | and then (Has_Pragma_Inline_Always (Spec_Id) | |
5296 | or else Optimization_Level > 0) | |
5297 | and then Serious_Errors_Detected = 0 | |
5298 | then | |
5299 | declare | |
5300 | P_Ent : Node_Id; | |
5301 | ||
5302 | begin | |
5303 | P_Ent := Body_Id; | |
5304 | loop | |
5305 | P_Ent := Scope (P_Ent); | |
5306 | exit when No (P_Ent) or else P_Ent = Standard_Standard; | |
5307 | ||
5308 | if Is_Subprogram (P_Ent) then | |
5309 | Set_Is_Inlined (P_Ent, False); | |
5310 | ||
5311 | if Comes_From_Source (P_Ent) | |
5312 | and then Has_Pragma_Inline (P_Ent) | |
5313 | then | |
5314 | Cannot_Inline | |
5315 | ("cannot inline& (nested subprogram)?", N, P_Ent, | |
5316 | Is_Serious => True); | |
5317 | end if; | |
5318 | end if; | |
5319 | end loop; | |
5320 | end; | |
5321 | end if; | |
5322 | ||
5323 | -- Build the body to inline only if really needed! | |
5324 | ||
5325 | if Check_Body_To_Inline (N, Spec_Id) | |
5326 | and then Serious_Errors_Detected = 0 | |
5327 | then | |
5328 | if Returns_Unconstrained_Type (Spec_Id) then | |
5329 | if Can_Split_Unconstrained_Function (N) then | |
5330 | Split_Unconstrained_Function (N, Spec_Id); | |
5331 | Build_Body_To_Inline (N, Spec_Id); | |
5332 | Set_Is_Inlined (Spec_Id); | |
5333 | end if; | |
5334 | else | |
5335 | Build_Body_To_Inline (N, Spec_Id); | |
5336 | Set_Is_Inlined (Spec_Id); | |
5337 | end if; | |
5338 | end if; | |
5339 | end Check_And_Build_Body_To_Inline; | |
5340 | ||
996ae0b0 RK |
5341 | ----------------------- |
5342 | -- Check_Conformance -- | |
5343 | ----------------------- | |
5344 | ||
5345 | procedure Check_Conformance | |
41251c60 JM |
5346 | (New_Id : Entity_Id; |
5347 | Old_Id : Entity_Id; | |
5348 | Ctype : Conformance_Type; | |
5349 | Errmsg : Boolean; | |
5350 | Conforms : out Boolean; | |
5351 | Err_Loc : Node_Id := Empty; | |
5352 | Get_Inst : Boolean := False; | |
5353 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 | 5354 | is |
996ae0b0 | 5355 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
c27f2f15 RD |
5356 | -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
5357 | -- If Errmsg is True, then processing continues to post an error message | |
5358 | -- for conformance error on given node. Two messages are output. The | |
5359 | -- first message points to the previous declaration with a general "no | |
5360 | -- conformance" message. The second is the detailed reason, supplied as | |
5361 | -- Msg. The parameter N provide information for a possible & insertion | |
5362 | -- in the message, and also provides the location for posting the | |
5363 | -- message in the absence of a specified Err_Loc location. | |
996ae0b0 RK |
5364 | |
5365 | ----------------------- | |
5366 | -- Conformance_Error -- | |
5367 | ----------------------- | |
5368 | ||
5369 | procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is | |
5370 | Enode : Node_Id; | |
5371 | ||
5372 | begin | |
5373 | Conforms := False; | |
5374 | ||
5375 | if Errmsg then | |
5376 | if No (Err_Loc) then | |
5377 | Enode := N; | |
5378 | else | |
5379 | Enode := Err_Loc; | |
5380 | end if; | |
5381 | ||
5382 | Error_Msg_Sloc := Sloc (Old_Id); | |
5383 | ||
5384 | case Ctype is | |
5385 | when Type_Conformant => | |
483c78cb | 5386 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
5387 | ("not type conformant with declaration#!", Enode); |
5388 | ||
5389 | when Mode_Conformant => | |
19590d70 | 5390 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5391 | Error_Msg_N |
19590d70 GD |
5392 | ("not mode conformant with operation inherited#!", |
5393 | Enode); | |
5394 | else | |
ed2233dc | 5395 | Error_Msg_N |
19590d70 GD |
5396 | ("not mode conformant with declaration#!", Enode); |
5397 | end if; | |
996ae0b0 RK |
5398 | |
5399 | when Subtype_Conformant => | |
19590d70 | 5400 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
ed2233dc | 5401 | Error_Msg_N |
19590d70 GD |
5402 | ("not subtype conformant with operation inherited#!", |
5403 | Enode); | |
5404 | else | |
ed2233dc | 5405 | Error_Msg_N |
19590d70 GD |
5406 | ("not subtype conformant with declaration#!", Enode); |
5407 | end if; | |
996ae0b0 RK |
5408 | |
5409 | when Fully_Conformant => | |
19590d70 | 5410 | if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
483c78cb | 5411 | Error_Msg_N -- CODEFIX |
19590d70 GD |
5412 | ("not fully conformant with operation inherited#!", |
5413 | Enode); | |
5414 | else | |
483c78cb | 5415 | Error_Msg_N -- CODEFIX |
19590d70 GD |
5416 | ("not fully conformant with declaration#!", Enode); |
5417 | end if; | |
996ae0b0 RK |
5418 | end case; |
5419 | ||
5420 | Error_Msg_NE (Msg, Enode, N); | |
5421 | end if; | |
5422 | end Conformance_Error; | |
5423 | ||
ec4867fa ES |
5424 | -- Local Variables |
5425 | ||
5426 | Old_Type : constant Entity_Id := Etype (Old_Id); | |
5427 | New_Type : constant Entity_Id := Etype (New_Id); | |
5428 | Old_Formal : Entity_Id; | |
5429 | New_Formal : Entity_Id; | |
5430 | Access_Types_Match : Boolean; | |
5431 | Old_Formal_Base : Entity_Id; | |
5432 | New_Formal_Base : Entity_Id; | |
5433 | ||
996ae0b0 RK |
5434 | -- Start of processing for Check_Conformance |
5435 | ||
5436 | begin | |
5437 | Conforms := True; | |
5438 | ||
82c80734 RD |
5439 | -- We need a special case for operators, since they don't appear |
5440 | -- explicitly. | |
996ae0b0 RK |
5441 | |
5442 | if Ctype = Type_Conformant then | |
5443 | if Ekind (New_Id) = E_Operator | |
5444 | and then Operator_Matches_Spec (New_Id, Old_Id) | |
5445 | then | |
5446 | return; | |
5447 | end if; | |
5448 | end if; | |
5449 | ||
5450 | -- If both are functions/operators, check return types conform | |
5451 | ||
5452 | if Old_Type /= Standard_Void_Type | |
5453 | and then New_Type /= Standard_Void_Type | |
5454 | then | |
fceeaab6 ES |
5455 | |
5456 | -- If we are checking interface conformance we omit controlling | |
5457 | -- arguments and result, because we are only checking the conformance | |
5458 | -- of the remaining parameters. | |
5459 | ||
5460 | if Has_Controlling_Result (Old_Id) | |
5461 | and then Has_Controlling_Result (New_Id) | |
5462 | and then Skip_Controlling_Formals | |
5463 | then | |
5464 | null; | |
5465 | ||
5466 | elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then | |
5d37ba92 | 5467 | Conformance_Error ("\return type does not match!", New_Id); |
996ae0b0 RK |
5468 | return; |
5469 | end if; | |
5470 | ||
41251c60 | 5471 | -- Ada 2005 (AI-231): In case of anonymous access types check the |
0a36105d | 5472 | -- null-exclusion and access-to-constant attributes match. |
41251c60 | 5473 | |
0791fbe9 | 5474 | if Ada_Version >= Ada_2005 |
41251c60 JM |
5475 | and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
5476 | and then | |
5477 | (Can_Never_Be_Null (Old_Type) | |
5478 | /= Can_Never_Be_Null (New_Type) | |
5479 | or else Is_Access_Constant (Etype (Old_Type)) | |
5480 | /= Is_Access_Constant (Etype (New_Type))) | |
5481 | then | |
5d37ba92 | 5482 | Conformance_Error ("\return type does not match!", New_Id); |
41251c60 JM |
5483 | return; |
5484 | end if; | |
5485 | ||
996ae0b0 RK |
5486 | -- If either is a function/operator and the other isn't, error |
5487 | ||
5488 | elsif Old_Type /= Standard_Void_Type | |
5489 | or else New_Type /= Standard_Void_Type | |
5490 | then | |
5d37ba92 | 5491 | Conformance_Error ("\functions can only match functions!", New_Id); |
996ae0b0 RK |
5492 | return; |
5493 | end if; | |
5494 | ||
0a36105d | 5495 | -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
996ae0b0 RK |
5496 | -- If this is a renaming as body, refine error message to indicate that |
5497 | -- the conflict is with the original declaration. If the entity is not | |
5498 | -- frozen, the conventions don't have to match, the one of the renamed | |
5499 | -- entity is inherited. | |
5500 | ||
5501 | if Ctype >= Subtype_Conformant then | |
996ae0b0 RK |
5502 | if Convention (Old_Id) /= Convention (New_Id) then |
5503 | ||
5504 | if not Is_Frozen (New_Id) then | |
5505 | null; | |
5506 | ||
5507 | elsif Present (Err_Loc) | |
5508 | and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration | |
5509 | and then Present (Corresponding_Spec (Err_Loc)) | |
5510 | then | |
5511 | Error_Msg_Name_1 := Chars (New_Id); | |
5512 | Error_Msg_Name_2 := | |
5513 | Name_Ada + Convention_Id'Pos (Convention (New_Id)); | |
5d37ba92 | 5514 | Conformance_Error ("\prior declaration for% has convention %!"); |
996ae0b0 RK |
5515 | |
5516 | else | |
5d37ba92 | 5517 | Conformance_Error ("\calling conventions do not match!"); |
996ae0b0 RK |
5518 | end if; |
5519 | ||
5520 | return; | |
5521 | ||
5522 | elsif Is_Formal_Subprogram (Old_Id) | |
5523 | or else Is_Formal_Subprogram (New_Id) | |
5524 | then | |
5d37ba92 | 5525 | Conformance_Error ("\formal subprograms not allowed!"); |
996ae0b0 RK |
5526 | return; |
5527 | end if; | |
5528 | end if; | |
5529 | ||
5530 | -- Deal with parameters | |
5531 | ||
5532 | -- Note: we use the entity information, rather than going directly | |
5533 | -- to the specification in the tree. This is not only simpler, but | |
5534 | -- absolutely necessary for some cases of conformance tests between | |
5535 | -- operators, where the declaration tree simply does not exist! | |
5536 | ||
5537 | Old_Formal := First_Formal (Old_Id); | |
5538 | New_Formal := First_Formal (New_Id); | |
996ae0b0 | 5539 | while Present (Old_Formal) and then Present (New_Formal) loop |
41251c60 JM |
5540 | if Is_Controlling_Formal (Old_Formal) |
5541 | and then Is_Controlling_Formal (New_Formal) | |
5542 | and then Skip_Controlling_Formals | |
5543 | then | |
a2dc5812 AC |
5544 | -- The controlling formals will have different types when |
5545 | -- comparing an interface operation with its match, but both | |
5546 | -- or neither must be access parameters. | |
5547 | ||
5548 | if Is_Access_Type (Etype (Old_Formal)) | |
5549 | = | |
5550 | Is_Access_Type (Etype (New_Formal)) | |
5551 | then | |
5552 | goto Skip_Controlling_Formal; | |
5553 | else | |
5554 | Conformance_Error | |
5555 | ("\access parameter does not match!", New_Formal); | |
5556 | end if; | |
41251c60 JM |
5557 | end if; |
5558 | ||
fbf5a39b AC |
5559 | if Ctype = Fully_Conformant then |
5560 | ||
5561 | -- Names must match. Error message is more accurate if we do | |
5562 | -- this before checking that the types of the formals match. | |
5563 | ||
5564 | if Chars (Old_Formal) /= Chars (New_Formal) then | |
5d37ba92 | 5565 | Conformance_Error ("\name & does not match!", New_Formal); |
fbf5a39b AC |
5566 | |
5567 | -- Set error posted flag on new formal as well to stop | |
5568 | -- junk cascaded messages in some cases. | |
5569 | ||
5570 | Set_Error_Posted (New_Formal); | |
5571 | return; | |
5572 | end if; | |
40b93859 RD |
5573 | |
5574 | -- Null exclusion must match | |
5575 | ||
5576 | if Null_Exclusion_Present (Parent (Old_Formal)) | |
5577 | /= | |
5578 | Null_Exclusion_Present (Parent (New_Formal)) | |
5579 | then | |
5580 | -- Only give error if both come from source. This should be | |
5581 | -- investigated some time, since it should not be needed ??? | |
5582 | ||
5583 | if Comes_From_Source (Old_Formal) | |
5584 | and then | |
5585 | Comes_From_Source (New_Formal) | |
5586 | then | |
5587 | Conformance_Error | |
5588 | ("\null exclusion for & does not match", New_Formal); | |
5589 | ||
5590 | -- Mark error posted on the new formal to avoid duplicated | |
5591 | -- complaint about types not matching. | |
5592 | ||
5593 | Set_Error_Posted (New_Formal); | |
5594 | end if; | |
5595 | end if; | |
fbf5a39b | 5596 | end if; |
996ae0b0 | 5597 | |
ec4867fa ES |
5598 | -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
5599 | -- case occurs whenever a subprogram is being renamed and one of its | |
5600 | -- parameters imposes a null exclusion. For example: | |
5601 | ||
5602 | -- type T is null record; | |
5603 | -- type Acc_T is access T; | |
5604 | -- subtype Acc_T_Sub is Acc_T; | |
5605 | ||
5606 | -- procedure P (Obj : not null Acc_T_Sub); -- itype | |
5607 | -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype | |
5608 | -- renames P; | |
5609 | ||
5610 | Old_Formal_Base := Etype (Old_Formal); | |
5611 | New_Formal_Base := Etype (New_Formal); | |
5612 | ||
5613 | if Get_Inst then | |
5614 | Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); | |
5615 | New_Formal_Base := Get_Instance_Of (New_Formal_Base); | |
5616 | end if; | |
5617 | ||
0791fbe9 | 5618 | Access_Types_Match := Ada_Version >= Ada_2005 |
ec4867fa ES |
5619 | |
5620 | -- Ensure that this rule is only applied when New_Id is a | |
5d37ba92 | 5621 | -- renaming of Old_Id. |
ec4867fa | 5622 | |
5d37ba92 ES |
5623 | and then Nkind (Parent (Parent (New_Id))) = |
5624 | N_Subprogram_Renaming_Declaration | |
ec4867fa ES |
5625 | and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
5626 | and then Present (Entity (Name (Parent (Parent (New_Id))))) | |
5627 | and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id | |
5628 | ||
5629 | -- Now handle the allowed access-type case | |
5630 | ||
5631 | and then Is_Access_Type (Old_Formal_Base) | |
5632 | and then Is_Access_Type (New_Formal_Base) | |
5d37ba92 ES |
5633 | |
5634 | -- The type kinds must match. The only exception occurs with | |
5635 | -- multiple generics of the form: | |
5636 | ||
5637 | -- generic generic | |
5638 | -- type F is private; type A is private; | |
5639 | -- type F_Ptr is access F; type A_Ptr is access A; | |
5640 | -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); | |
5641 | -- package F_Pack is ... package A_Pack is | |
5642 | -- package F_Inst is | |
5643 | -- new F_Pack (A, A_Ptr, A_P); | |
5644 | ||
5645 | -- When checking for conformance between the parameters of A_P | |
5646 | -- and F_P, the type kinds of F_Ptr and A_Ptr will not match | |
5647 | -- because the compiler has transformed A_Ptr into a subtype of | |
5648 | -- F_Ptr. We catch this case in the code below. | |
5649 | ||
5650 | and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) | |
5651 | or else | |
5652 | (Is_Generic_Type (Old_Formal_Base) | |
5653 | and then Is_Generic_Type (New_Formal_Base) | |
5654 | and then Is_Internal (New_Formal_Base) | |
5655 | and then Etype (Etype (New_Formal_Base)) = | |
5656 | Old_Formal_Base)) | |
ec4867fa ES |
5657 | and then Directly_Designated_Type (Old_Formal_Base) = |
5658 | Directly_Designated_Type (New_Formal_Base) | |
5659 | and then ((Is_Itype (Old_Formal_Base) | |
5660 | and then Can_Never_Be_Null (Old_Formal_Base)) | |
5661 | or else | |
5662 | (Is_Itype (New_Formal_Base) | |
5663 | and then Can_Never_Be_Null (New_Formal_Base))); | |
5664 | ||
996ae0b0 RK |
5665 | -- Types must always match. In the visible part of an instance, |
5666 | -- usual overloading rules for dispatching operations apply, and | |
5667 | -- we check base types (not the actual subtypes). | |
5668 | ||
5669 | if In_Instance_Visible_Part | |
5670 | and then Is_Dispatching_Operation (New_Id) | |
5671 | then | |
5672 | if not Conforming_Types | |
ec4867fa ES |
5673 | (T1 => Base_Type (Etype (Old_Formal)), |
5674 | T2 => Base_Type (Etype (New_Formal)), | |
5675 | Ctype => Ctype, | |
5676 | Get_Inst => Get_Inst) | |
5677 | and then not Access_Types_Match | |
996ae0b0 | 5678 | then |
5d37ba92 | 5679 | Conformance_Error ("\type of & does not match!", New_Formal); |
996ae0b0 RK |
5680 | return; |
5681 | end if; | |
5682 | ||
5683 | elsif not Conforming_Types | |
5d37ba92 ES |
5684 | (T1 => Old_Formal_Base, |
5685 | T2 => New_Formal_Base, | |
ec4867fa ES |
5686 | Ctype => Ctype, |
5687 | Get_Inst => Get_Inst) | |
5688 | and then not Access_Types_Match | |
996ae0b0 | 5689 | then |
c27f2f15 RD |
5690 | -- Don't give error message if old type is Any_Type. This test |
5691 | -- avoids some cascaded errors, e.g. in case of a bad spec. | |
5692 | ||
5693 | if Errmsg and then Old_Formal_Base = Any_Type then | |
5694 | Conforms := False; | |
5695 | else | |
5696 | Conformance_Error ("\type of & does not match!", New_Formal); | |
5697 | end if; | |
5698 | ||
996ae0b0 RK |
5699 | return; |
5700 | end if; | |
5701 | ||
5702 | -- For mode conformance, mode must match | |
5703 | ||
5d37ba92 ES |
5704 | if Ctype >= Mode_Conformant then |
5705 | if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then | |
dd54644b JM |
5706 | if not Ekind_In (New_Id, E_Function, E_Procedure) |
5707 | or else not Is_Primitive_Wrapper (New_Id) | |
5708 | then | |
5709 | Conformance_Error ("\mode of & does not match!", New_Formal); | |
c199ccf7 | 5710 | |
dd54644b JM |
5711 | else |
5712 | declare | |
c199ccf7 | 5713 | T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
dd54644b JM |
5714 | begin |
5715 | if Is_Protected_Type | |
5716 | (Corresponding_Concurrent_Type (T)) | |
5717 | then | |
5718 | Error_Msg_PT (T, New_Id); | |
5719 | else | |
5720 | Conformance_Error | |
5721 | ("\mode of & does not match!", New_Formal); | |
5722 | end if; | |
5723 | end; | |
5724 | end if; | |
5725 | ||
5d37ba92 ES |
5726 | return; |
5727 | ||
5728 | -- Part of mode conformance for access types is having the same | |
5729 | -- constant modifier. | |
5730 | ||
5731 | elsif Access_Types_Match | |
5732 | and then Is_Access_Constant (Old_Formal_Base) /= | |
5733 | Is_Access_Constant (New_Formal_Base) | |
5734 | then | |
5735 | Conformance_Error | |
5736 | ("\constant modifier does not match!", New_Formal); | |
5737 | return; | |
5738 | end if; | |
996ae0b0 RK |
5739 | end if; |
5740 | ||
0a36105d | 5741 | if Ctype >= Subtype_Conformant then |
996ae0b0 | 5742 | |
0a36105d JM |
5743 | -- Ada 2005 (AI-231): In case of anonymous access types check |
5744 | -- the null-exclusion and access-to-constant attributes must | |
c7b9d548 AC |
5745 | -- match. For null exclusion, we test the types rather than the |
5746 | -- formals themselves, since the attribute is only set reliably | |
5747 | -- on the formals in the Ada 95 case, and we exclude the case | |
5748 | -- where Old_Formal is marked as controlling, to avoid errors | |
5749 | -- when matching completing bodies with dispatching declarations | |
5750 | -- (access formals in the bodies aren't marked Can_Never_Be_Null). | |
996ae0b0 | 5751 | |
0791fbe9 | 5752 | if Ada_Version >= Ada_2005 |
0a36105d JM |
5753 | and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
5754 | and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type | |
5755 | and then | |
c7b9d548 AC |
5756 | ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
5757 | Can_Never_Be_Null (Etype (New_Formal)) | |
5758 | and then | |
5759 | not Is_Controlling_Formal (Old_Formal)) | |
0a36105d JM |
5760 | or else |
5761 | Is_Access_Constant (Etype (Old_Formal)) /= | |
5762 | Is_Access_Constant (Etype (New_Formal))) | |
40b93859 RD |
5763 | |
5764 | -- Do not complain if error already posted on New_Formal. This | |
5765 | -- avoids some redundant error messages. | |
5766 | ||
5767 | and then not Error_Posted (New_Formal) | |
0a36105d JM |
5768 | then |
5769 | -- It is allowed to omit the null-exclusion in case of stream | |
5770 | -- attribute subprograms. We recognize stream subprograms | |
5771 | -- through their TSS-generated suffix. | |
996ae0b0 | 5772 | |
0a36105d JM |
5773 | declare |
5774 | TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); | |
5775 | begin | |
5776 | if TSS_Name /= TSS_Stream_Read | |
5777 | and then TSS_Name /= TSS_Stream_Write | |
5778 | and then TSS_Name /= TSS_Stream_Input | |
5779 | and then TSS_Name /= TSS_Stream_Output | |
5780 | then | |
5781 | Conformance_Error | |
5d37ba92 | 5782 | ("\type of & does not match!", New_Formal); |
0a36105d JM |
5783 | return; |
5784 | end if; | |
5785 | end; | |
5786 | end if; | |
5787 | end if; | |
41251c60 | 5788 | |
0a36105d | 5789 | -- Full conformance checks |
41251c60 | 5790 | |
0a36105d | 5791 | if Ctype = Fully_Conformant then |
e660dbf7 | 5792 | |
0a36105d | 5793 | -- We have checked already that names match |
e660dbf7 | 5794 | |
0a36105d | 5795 | if Parameter_Mode (Old_Formal) = E_In_Parameter then |
41251c60 JM |
5796 | |
5797 | -- Check default expressions for in parameters | |
5798 | ||
996ae0b0 RK |
5799 | declare |
5800 | NewD : constant Boolean := | |
5801 | Present (Default_Value (New_Formal)); | |
5802 | OldD : constant Boolean := | |
5803 | Present (Default_Value (Old_Formal)); | |
5804 | begin | |
5805 | if NewD or OldD then | |
5806 | ||
82c80734 RD |
5807 | -- The old default value has been analyzed because the |
5808 | -- current full declaration will have frozen everything | |
0a36105d JM |
5809 | -- before. The new default value has not been analyzed, |
5810 | -- so analyze it now before we check for conformance. | |
996ae0b0 RK |
5811 | |
5812 | if NewD then | |
0a36105d | 5813 | Push_Scope (New_Id); |
21d27997 | 5814 | Preanalyze_Spec_Expression |
fbf5a39b | 5815 | (Default_Value (New_Formal), Etype (New_Formal)); |
996ae0b0 RK |
5816 | End_Scope; |
5817 | end if; | |
5818 | ||
5819 | if not (NewD and OldD) | |
5820 | or else not Fully_Conformant_Expressions | |
5821 | (Default_Value (Old_Formal), | |
5822 | Default_Value (New_Formal)) | |
5823 | then | |
5824 | Conformance_Error | |
5d37ba92 | 5825 | ("\default expression for & does not match!", |
996ae0b0 RK |
5826 | New_Formal); |
5827 | return; | |
5828 | end if; | |
5829 | end if; | |
5830 | end; | |
5831 | end if; | |
5832 | end if; | |
5833 | ||
5834 | -- A couple of special checks for Ada 83 mode. These checks are | |
0a36105d | 5835 | -- skipped if either entity is an operator in package Standard, |
996ae0b0 RK |
5836 | -- or if either old or new instance is not from the source program. |
5837 | ||
0ab80019 | 5838 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5839 | and then Sloc (Old_Id) > Standard_Location |
5840 | and then Sloc (New_Id) > Standard_Location | |
5841 | and then Comes_From_Source (Old_Id) | |
5842 | and then Comes_From_Source (New_Id) | |
5843 | then | |
5844 | declare | |
5845 | Old_Param : constant Node_Id := Declaration_Node (Old_Formal); | |
5846 | New_Param : constant Node_Id := Declaration_Node (New_Formal); | |
5847 | ||
5848 | begin | |
5849 | -- Explicit IN must be present or absent in both cases. This | |
5850 | -- test is required only in the full conformance case. | |
5851 | ||
5852 | if In_Present (Old_Param) /= In_Present (New_Param) | |
5853 | and then Ctype = Fully_Conformant | |
5854 | then | |
5855 | Conformance_Error | |
5d37ba92 | 5856 | ("\(Ada 83) IN must appear in both declarations", |
996ae0b0 RK |
5857 | New_Formal); |
5858 | return; | |
5859 | end if; | |
5860 | ||
5861 | -- Grouping (use of comma in param lists) must be the same | |
5862 | -- This is where we catch a misconformance like: | |
5863 | ||
0a36105d | 5864 | -- A, B : Integer |
996ae0b0 RK |
5865 | -- A : Integer; B : Integer |
5866 | ||
5867 | -- which are represented identically in the tree except | |
5868 | -- for the setting of the flags More_Ids and Prev_Ids. | |
5869 | ||
5870 | if More_Ids (Old_Param) /= More_Ids (New_Param) | |
5871 | or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) | |
5872 | then | |
5873 | Conformance_Error | |
5d37ba92 | 5874 | ("\grouping of & does not match!", New_Formal); |
996ae0b0 RK |
5875 | return; |
5876 | end if; | |
5877 | end; | |
5878 | end if; | |
5879 | ||
41251c60 JM |
5880 | -- This label is required when skipping controlling formals |
5881 | ||
5882 | <<Skip_Controlling_Formal>> | |
5883 | ||
996ae0b0 RK |
5884 | Next_Formal (Old_Formal); |
5885 | Next_Formal (New_Formal); | |
5886 | end loop; | |
5887 | ||
5888 | if Present (Old_Formal) then | |
5d37ba92 | 5889 | Conformance_Error ("\too few parameters!"); |
996ae0b0 RK |
5890 | return; |
5891 | ||
5892 | elsif Present (New_Formal) then | |
5d37ba92 | 5893 | Conformance_Error ("\too many parameters!", New_Formal); |
996ae0b0 RK |
5894 | return; |
5895 | end if; | |
996ae0b0 RK |
5896 | end Check_Conformance; |
5897 | ||
ec4867fa ES |
5898 | ----------------------- |
5899 | -- Check_Conventions -- | |
5900 | ----------------------- | |
5901 | ||
5902 | procedure Check_Conventions (Typ : Entity_Id) is | |
ce2b6ba5 | 5903 | Ifaces_List : Elist_Id; |
0a36105d | 5904 | |
ce2b6ba5 | 5905 | procedure Check_Convention (Op : Entity_Id); |
0a36105d JM |
5906 | -- Verify that the convention of inherited dispatching operation Op is |
5907 | -- consistent among all subprograms it overrides. In order to minimize | |
5908 | -- the search, Search_From is utilized to designate a specific point in | |
5909 | -- the list rather than iterating over the whole list once more. | |
ec4867fa ES |
5910 | |
5911 | ---------------------- | |
5912 | -- Check_Convention -- | |
5913 | ---------------------- | |
5914 | ||
ce2b6ba5 JM |
5915 | procedure Check_Convention (Op : Entity_Id) is |
5916 | Iface_Elmt : Elmt_Id; | |
5917 | Iface_Prim_Elmt : Elmt_Id; | |
5918 | Iface_Prim : Entity_Id; | |
ec4867fa | 5919 | |
ce2b6ba5 JM |
5920 | begin |
5921 | Iface_Elmt := First_Elmt (Ifaces_List); | |
5922 | while Present (Iface_Elmt) loop | |
5923 | Iface_Prim_Elmt := | |
5924 | First_Elmt (Primitive_Operations (Node (Iface_Elmt))); | |
5925 | while Present (Iface_Prim_Elmt) loop | |
5926 | Iface_Prim := Node (Iface_Prim_Elmt); | |
5927 | ||
5928 | if Is_Interface_Conformant (Typ, Iface_Prim, Op) | |
5929 | and then Convention (Iface_Prim) /= Convention (Op) | |
5930 | then | |
ed2233dc | 5931 | Error_Msg_N |
ce2b6ba5 | 5932 | ("inconsistent conventions in primitive operations", Typ); |
ec4867fa | 5933 | |
ce2b6ba5 JM |
5934 | Error_Msg_Name_1 := Chars (Op); |
5935 | Error_Msg_Name_2 := Get_Convention_Name (Convention (Op)); | |
5936 | Error_Msg_Sloc := Sloc (Op); | |
ec4867fa | 5937 | |
7a963087 | 5938 | if Comes_From_Source (Op) or else No (Alias (Op)) then |
038140ed | 5939 | if not Present (Overridden_Operation (Op)) then |
ed2233dc | 5940 | Error_Msg_N ("\\primitive % defined #", Typ); |
ce2b6ba5 | 5941 | else |
ed2233dc | 5942 | Error_Msg_N |
19d846a0 RD |
5943 | ("\\overriding operation % with " & |
5944 | "convention % defined #", Typ); | |
ce2b6ba5 | 5945 | end if; |
ec4867fa | 5946 | |
ce2b6ba5 JM |
5947 | else pragma Assert (Present (Alias (Op))); |
5948 | Error_Msg_Sloc := Sloc (Alias (Op)); | |
ed2233dc | 5949 | Error_Msg_N |
19d846a0 RD |
5950 | ("\\inherited operation % with " & |
5951 | "convention % defined #", Typ); | |
ce2b6ba5 | 5952 | end if; |
ec4867fa | 5953 | |
ce2b6ba5 JM |
5954 | Error_Msg_Name_1 := Chars (Op); |
5955 | Error_Msg_Name_2 := | |
5956 | Get_Convention_Name (Convention (Iface_Prim)); | |
5957 | Error_Msg_Sloc := Sloc (Iface_Prim); | |
ed2233dc | 5958 | Error_Msg_N |
19d846a0 RD |
5959 | ("\\overridden operation % with " & |
5960 | "convention % defined #", Typ); | |
ec4867fa | 5961 | |
ce2b6ba5 | 5962 | -- Avoid cascading errors |
ec4867fa | 5963 | |
ce2b6ba5 JM |
5964 | return; |
5965 | end if; | |
ec4867fa | 5966 | |
ce2b6ba5 JM |
5967 | Next_Elmt (Iface_Prim_Elmt); |
5968 | end loop; | |
ec4867fa | 5969 | |
ce2b6ba5 | 5970 | Next_Elmt (Iface_Elmt); |
ec4867fa ES |
5971 | end loop; |
5972 | end Check_Convention; | |
5973 | ||
5974 | -- Local variables | |
5975 | ||
5976 | Prim_Op : Entity_Id; | |
5977 | Prim_Op_Elmt : Elmt_Id; | |
5978 | ||
5979 | -- Start of processing for Check_Conventions | |
5980 | ||
5981 | begin | |
ce2b6ba5 JM |
5982 | if not Has_Interfaces (Typ) then |
5983 | return; | |
5984 | end if; | |
5985 | ||
5986 | Collect_Interfaces (Typ, Ifaces_List); | |
5987 | ||
0a36105d JM |
5988 | -- The algorithm checks every overriding dispatching operation against |
5989 | -- all the corresponding overridden dispatching operations, detecting | |
f3d57416 | 5990 | -- differences in conventions. |
ec4867fa ES |
5991 | |
5992 | Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
5993 | while Present (Prim_Op_Elmt) loop | |
5994 | Prim_Op := Node (Prim_Op_Elmt); | |
5995 | ||
0a36105d | 5996 | -- A small optimization: skip the predefined dispatching operations |
ce2b6ba5 | 5997 | -- since they always have the same convention. |
ec4867fa | 5998 | |
ce2b6ba5 JM |
5999 | if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
6000 | Check_Convention (Prim_Op); | |
ec4867fa ES |
6001 | end if; |
6002 | ||
6003 | Next_Elmt (Prim_Op_Elmt); | |
6004 | end loop; | |
6005 | end Check_Conventions; | |
6006 | ||
996ae0b0 RK |
6007 | ------------------------------ |
6008 | -- Check_Delayed_Subprogram -- | |
6009 | ------------------------------ | |
6010 | ||
6011 | procedure Check_Delayed_Subprogram (Designator : Entity_Id) is | |
6012 | F : Entity_Id; | |
6013 | ||
6014 | procedure Possible_Freeze (T : Entity_Id); | |
6015 | -- T is the type of either a formal parameter or of the return type. | |
6016 | -- If T is not yet frozen and needs a delayed freeze, then the | |
4a13695c AC |
6017 | -- subprogram itself must be delayed. If T is the limited view of an |
6018 | -- incomplete type the subprogram must be frozen as well, because | |
6019 | -- T may depend on local types that have not been frozen yet. | |
996ae0b0 | 6020 | |
82c80734 RD |
6021 | --------------------- |
6022 | -- Possible_Freeze -- | |
6023 | --------------------- | |
6024 | ||
996ae0b0 RK |
6025 | procedure Possible_Freeze (T : Entity_Id) is |
6026 | begin | |
4a13695c | 6027 | if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
996ae0b0 RK |
6028 | Set_Has_Delayed_Freeze (Designator); |
6029 | ||
6030 | elsif Is_Access_Type (T) | |
6031 | and then Has_Delayed_Freeze (Designated_Type (T)) | |
6032 | and then not Is_Frozen (Designated_Type (T)) | |
6033 | then | |
6034 | Set_Has_Delayed_Freeze (Designator); | |
e358346d | 6035 | |
4a13695c | 6036 | elsif Ekind (T) = E_Incomplete_Type and then From_With_Type (T) then |
e358346d | 6037 | Set_Has_Delayed_Freeze (Designator); |
406935b6 | 6038 | |
9aff36e9 RD |
6039 | -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile |
6040 | -- of a subprogram or entry declaration. | |
406935b6 AC |
6041 | |
6042 | elsif Ekind (T) = E_Incomplete_Type | |
6043 | and then Ada_Version >= Ada_2012 | |
6044 | then | |
6045 | Set_Has_Delayed_Freeze (Designator); | |
996ae0b0 | 6046 | end if; |
4a13695c | 6047 | |
996ae0b0 RK |
6048 | end Possible_Freeze; |
6049 | ||
6050 | -- Start of processing for Check_Delayed_Subprogram | |
6051 | ||
6052 | begin | |
76e3504f AC |
6053 | -- All subprograms, including abstract subprograms, may need a freeze |
6054 | -- node if some formal type or the return type needs one. | |
996ae0b0 | 6055 | |
76e3504f AC |
6056 | Possible_Freeze (Etype (Designator)); |
6057 | Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? | |
996ae0b0 | 6058 | |
76e3504f AC |
6059 | -- Need delayed freeze if any of the formal types themselves need |
6060 | -- a delayed freeze and are not yet frozen. | |
996ae0b0 | 6061 | |
76e3504f AC |
6062 | F := First_Formal (Designator); |
6063 | while Present (F) loop | |
6064 | Possible_Freeze (Etype (F)); | |
6065 | Possible_Freeze (Base_Type (Etype (F))); -- needed ??? | |
6066 | Next_Formal (F); | |
6067 | end loop; | |
996ae0b0 RK |
6068 | |
6069 | -- Mark functions that return by reference. Note that it cannot be | |
6070 | -- done for delayed_freeze subprograms because the underlying | |
6071 | -- returned type may not be known yet (for private types) | |
6072 | ||
6073 | if not Has_Delayed_Freeze (Designator) | |
6074 | and then Expander_Active | |
6075 | then | |
6076 | declare | |
6077 | Typ : constant Entity_Id := Etype (Designator); | |
6078 | Utyp : constant Entity_Id := Underlying_Type (Typ); | |
9694c039 | 6079 | |
996ae0b0 | 6080 | begin |
40f07b4b | 6081 | if Is_Immutably_Limited_Type (Typ) then |
996ae0b0 | 6082 | Set_Returns_By_Ref (Designator); |
9694c039 | 6083 | |
048e5cef | 6084 | elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
996ae0b0 RK |
6085 | Set_Returns_By_Ref (Designator); |
6086 | end if; | |
6087 | end; | |
6088 | end if; | |
6089 | end Check_Delayed_Subprogram; | |
6090 | ||
6091 | ------------------------------------ | |
6092 | -- Check_Discriminant_Conformance -- | |
6093 | ------------------------------------ | |
6094 | ||
6095 | procedure Check_Discriminant_Conformance | |
6096 | (N : Node_Id; | |
6097 | Prev : Entity_Id; | |
6098 | Prev_Loc : Node_Id) | |
6099 | is | |
6100 | Old_Discr : Entity_Id := First_Discriminant (Prev); | |
6101 | New_Discr : Node_Id := First (Discriminant_Specifications (N)); | |
6102 | New_Discr_Id : Entity_Id; | |
6103 | New_Discr_Type : Entity_Id; | |
6104 | ||
6105 | procedure Conformance_Error (Msg : String; N : Node_Id); | |
82c80734 RD |
6106 | -- Post error message for conformance error on given node. Two messages |
6107 | -- are output. The first points to the previous declaration with a | |
6108 | -- general "no conformance" message. The second is the detailed reason, | |
6109 | -- supplied as Msg. The parameter N provide information for a possible | |
6110 | -- & insertion in the message. | |
996ae0b0 RK |
6111 | |
6112 | ----------------------- | |
6113 | -- Conformance_Error -- | |
6114 | ----------------------- | |
6115 | ||
6116 | procedure Conformance_Error (Msg : String; N : Node_Id) is | |
6117 | begin | |
6118 | Error_Msg_Sloc := Sloc (Prev_Loc); | |
483c78cb RD |
6119 | Error_Msg_N -- CODEFIX |
6120 | ("not fully conformant with declaration#!", N); | |
996ae0b0 RK |
6121 | Error_Msg_NE (Msg, N, N); |
6122 | end Conformance_Error; | |
6123 | ||
6124 | -- Start of processing for Check_Discriminant_Conformance | |
6125 | ||
6126 | begin | |
6127 | while Present (Old_Discr) and then Present (New_Discr) loop | |
6128 | ||
6129 | New_Discr_Id := Defining_Identifier (New_Discr); | |
6130 | ||
82c80734 RD |
6131 | -- The subtype mark of the discriminant on the full type has not |
6132 | -- been analyzed so we do it here. For an access discriminant a new | |
6133 | -- type is created. | |
996ae0b0 RK |
6134 | |
6135 | if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then | |
6136 | New_Discr_Type := | |
6137 | Access_Definition (N, Discriminant_Type (New_Discr)); | |
6138 | ||
6139 | else | |
6140 | Analyze (Discriminant_Type (New_Discr)); | |
6141 | New_Discr_Type := Etype (Discriminant_Type (New_Discr)); | |
e50e1c5e AC |
6142 | |
6143 | -- Ada 2005: if the discriminant definition carries a null | |
6144 | -- exclusion, create an itype to check properly for consistency | |
6145 | -- with partial declaration. | |
6146 | ||
6147 | if Is_Access_Type (New_Discr_Type) | |
6148 | and then Null_Exclusion_Present (New_Discr) | |
6149 | then | |
6150 | New_Discr_Type := | |
6151 | Create_Null_Excluding_Itype | |
6152 | (T => New_Discr_Type, | |
6153 | Related_Nod => New_Discr, | |
6154 | Scope_Id => Current_Scope); | |
6155 | end if; | |
996ae0b0 RK |
6156 | end if; |
6157 | ||
6158 | if not Conforming_Types | |
6159 | (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) | |
6160 | then | |
6161 | Conformance_Error ("type of & does not match!", New_Discr_Id); | |
6162 | return; | |
fbf5a39b | 6163 | else |
82c80734 RD |
6164 | -- Treat the new discriminant as an occurrence of the old one, |
6165 | -- for navigation purposes, and fill in some semantic | |
fbf5a39b AC |
6166 | -- information, for completeness. |
6167 | ||
6168 | Generate_Reference (Old_Discr, New_Discr_Id, 'r'); | |
6169 | Set_Etype (New_Discr_Id, Etype (Old_Discr)); | |
6170 | Set_Scope (New_Discr_Id, Scope (Old_Discr)); | |
996ae0b0 RK |
6171 | end if; |
6172 | ||
6173 | -- Names must match | |
6174 | ||
6175 | if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then | |
6176 | Conformance_Error ("name & does not match!", New_Discr_Id); | |
6177 | return; | |
6178 | end if; | |
6179 | ||
6180 | -- Default expressions must match | |
6181 | ||
6182 | declare | |
6183 | NewD : constant Boolean := | |
6184 | Present (Expression (New_Discr)); | |
6185 | OldD : constant Boolean := | |
6186 | Present (Expression (Parent (Old_Discr))); | |
6187 | ||
6188 | begin | |
6189 | if NewD or OldD then | |
6190 | ||
6191 | -- The old default value has been analyzed and expanded, | |
6192 | -- because the current full declaration will have frozen | |
82c80734 RD |
6193 | -- everything before. The new default values have not been |
6194 | -- expanded, so expand now to check conformance. | |
996ae0b0 RK |
6195 | |
6196 | if NewD then | |
21d27997 | 6197 | Preanalyze_Spec_Expression |
996ae0b0 RK |
6198 | (Expression (New_Discr), New_Discr_Type); |
6199 | end if; | |
6200 | ||
6201 | if not (NewD and OldD) | |
6202 | or else not Fully_Conformant_Expressions | |
6203 | (Expression (Parent (Old_Discr)), | |
6204 | Expression (New_Discr)) | |
6205 | ||
6206 | then | |
6207 | Conformance_Error | |
6208 | ("default expression for & does not match!", | |
6209 | New_Discr_Id); | |
6210 | return; | |
6211 | end if; | |
6212 | end if; | |
6213 | end; | |
6214 | ||
6215 | -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) | |
6216 | ||
0ab80019 | 6217 | if Ada_Version = Ada_83 then |
996ae0b0 RK |
6218 | declare |
6219 | Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); | |
6220 | ||
6221 | begin | |
6222 | -- Grouping (use of comma in param lists) must be the same | |
6223 | -- This is where we catch a misconformance like: | |
6224 | ||
60370fb1 | 6225 | -- A, B : Integer |
996ae0b0 RK |
6226 | -- A : Integer; B : Integer |
6227 | ||
6228 | -- which are represented identically in the tree except | |
6229 | -- for the setting of the flags More_Ids and Prev_Ids. | |
6230 | ||
6231 | if More_Ids (Old_Disc) /= More_Ids (New_Discr) | |
6232 | or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) | |
6233 | then | |
6234 | Conformance_Error | |
6235 | ("grouping of & does not match!", New_Discr_Id); | |
6236 | return; | |
6237 | end if; | |
6238 | end; | |
6239 | end if; | |
6240 | ||
6241 | Next_Discriminant (Old_Discr); | |
6242 | Next (New_Discr); | |
6243 | end loop; | |
6244 | ||
6245 | if Present (Old_Discr) then | |
6246 | Conformance_Error ("too few discriminants!", Defining_Identifier (N)); | |
6247 | return; | |
6248 | ||
6249 | elsif Present (New_Discr) then | |
6250 | Conformance_Error | |
6251 | ("too many discriminants!", Defining_Identifier (New_Discr)); | |
6252 | return; | |
6253 | end if; | |
6254 | end Check_Discriminant_Conformance; | |
6255 | ||
6256 | ---------------------------- | |
6257 | -- Check_Fully_Conformant -- | |
6258 | ---------------------------- | |
6259 | ||
6260 | procedure Check_Fully_Conformant | |
6261 | (New_Id : Entity_Id; | |
6262 | Old_Id : Entity_Id; | |
6263 | Err_Loc : Node_Id := Empty) | |
6264 | is | |
6265 | Result : Boolean; | |
81db9d77 | 6266 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6267 | begin |
6268 | Check_Conformance | |
6269 | (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); | |
6270 | end Check_Fully_Conformant; | |
6271 | ||
6272 | --------------------------- | |
6273 | -- Check_Mode_Conformant -- | |
6274 | --------------------------- | |
6275 | ||
6276 | procedure Check_Mode_Conformant | |
6277 | (New_Id : Entity_Id; | |
6278 | Old_Id : Entity_Id; | |
6279 | Err_Loc : Node_Id := Empty; | |
6280 | Get_Inst : Boolean := False) | |
6281 | is | |
6282 | Result : Boolean; | |
81db9d77 | 6283 | pragma Warnings (Off, Result); |
996ae0b0 RK |
6284 | begin |
6285 | Check_Conformance | |
6286 | (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); | |
6287 | end Check_Mode_Conformant; | |
6288 | ||
fbf5a39b | 6289 | -------------------------------- |
758c442c | 6290 | -- Check_Overriding_Indicator -- |
fbf5a39b AC |
6291 | -------------------------------- |
6292 | ||
758c442c | 6293 | procedure Check_Overriding_Indicator |
ec4867fa | 6294 | (Subp : Entity_Id; |
5d37ba92 ES |
6295 | Overridden_Subp : Entity_Id; |
6296 | Is_Primitive : Boolean) | |
fbf5a39b | 6297 | is |
758c442c GD |
6298 | Decl : Node_Id; |
6299 | Spec : Node_Id; | |
fbf5a39b AC |
6300 | |
6301 | begin | |
ec4867fa | 6302 | -- No overriding indicator for literals |
fbf5a39b | 6303 | |
ec4867fa | 6304 | if Ekind (Subp) = E_Enumeration_Literal then |
758c442c | 6305 | return; |
fbf5a39b | 6306 | |
ec4867fa ES |
6307 | elsif Ekind (Subp) = E_Entry then |
6308 | Decl := Parent (Subp); | |
6309 | ||
53b10ce9 AC |
6310 | -- No point in analyzing a malformed operator |
6311 | ||
6312 | elsif Nkind (Subp) = N_Defining_Operator_Symbol | |
6313 | and then Error_Posted (Subp) | |
6314 | then | |
6315 | return; | |
6316 | ||
758c442c GD |
6317 | else |
6318 | Decl := Unit_Declaration_Node (Subp); | |
6319 | end if; | |
fbf5a39b | 6320 | |
800621e0 RD |
6321 | if Nkind_In (Decl, N_Subprogram_Body, |
6322 | N_Subprogram_Body_Stub, | |
6323 | N_Subprogram_Declaration, | |
6324 | N_Abstract_Subprogram_Declaration, | |
6325 | N_Subprogram_Renaming_Declaration) | |
758c442c GD |
6326 | then |
6327 | Spec := Specification (Decl); | |
ec4867fa ES |
6328 | |
6329 | elsif Nkind (Decl) = N_Entry_Declaration then | |
6330 | Spec := Decl; | |
6331 | ||
758c442c GD |
6332 | else |
6333 | return; | |
6334 | end if; | |
fbf5a39b | 6335 | |
e7d72fb9 AC |
6336 | -- The overriding operation is type conformant with the overridden one, |
6337 | -- but the names of the formals are not required to match. If the names | |
6823270c | 6338 | -- appear permuted in the overriding operation, this is a possible |
e7d72fb9 AC |
6339 | -- source of confusion that is worth diagnosing. Controlling formals |
6340 | -- often carry names that reflect the type, and it is not worthwhile | |
6341 | -- requiring that their names match. | |
6342 | ||
c9e7bd8e | 6343 | if Present (Overridden_Subp) |
e7d72fb9 AC |
6344 | and then Nkind (Subp) /= N_Defining_Operator_Symbol |
6345 | then | |
6346 | declare | |
6347 | Form1 : Entity_Id; | |
6348 | Form2 : Entity_Id; | |
6349 | ||
6350 | begin | |
6351 | Form1 := First_Formal (Subp); | |
6352 | Form2 := First_Formal (Overridden_Subp); | |
6353 | ||
c9e7bd8e AC |
6354 | -- If the overriding operation is a synchronized operation, skip |
6355 | -- the first parameter of the overridden operation, which is | |
6823270c AC |
6356 | -- implicit in the new one. If the operation is declared in the |
6357 | -- body it is not primitive and all formals must match. | |
c9e7bd8e | 6358 | |
6823270c AC |
6359 | if Is_Concurrent_Type (Scope (Subp)) |
6360 | and then Is_Tagged_Type (Scope (Subp)) | |
6361 | and then not Has_Completion (Scope (Subp)) | |
6362 | then | |
c9e7bd8e AC |
6363 | Form2 := Next_Formal (Form2); |
6364 | end if; | |
6365 | ||
e7d72fb9 AC |
6366 | if Present (Form1) then |
6367 | Form1 := Next_Formal (Form1); | |
6368 | Form2 := Next_Formal (Form2); | |
6369 | end if; | |
6370 | ||
6371 | while Present (Form1) loop | |
6372 | if not Is_Controlling_Formal (Form1) | |
6373 | and then Present (Next_Formal (Form2)) | |
6374 | and then Chars (Form1) = Chars (Next_Formal (Form2)) | |
6375 | then | |
6376 | Error_Msg_Node_2 := Alias (Overridden_Subp); | |
6377 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
ed2233dc | 6378 | Error_Msg_NE |
19d846a0 | 6379 | ("& does not match corresponding formal of&#", |
e7d72fb9 AC |
6380 | Form1, Form1); |
6381 | exit; | |
6382 | end if; | |
6383 | ||
6384 | Next_Formal (Form1); | |
6385 | Next_Formal (Form2); | |
6386 | end loop; | |
6387 | end; | |
6388 | end if; | |
6389 | ||
676e8420 AC |
6390 | -- If there is an overridden subprogram, then check that there is no |
6391 | -- "not overriding" indicator, and mark the subprogram as overriding. | |
51bf9bdf AC |
6392 | -- This is not done if the overridden subprogram is marked as hidden, |
6393 | -- which can occur for the case of inherited controlled operations | |
6394 | -- (see Derive_Subprogram), unless the inherited subprogram's parent | |
6395 | -- subprogram is not itself hidden. (Note: This condition could probably | |
6396 | -- be simplified, leaving out the testing for the specific controlled | |
6397 | -- cases, but it seems safer and clearer this way, and echoes similar | |
6398 | -- special-case tests of this kind in other places.) | |
6399 | ||
fd0d899b | 6400 | if Present (Overridden_Subp) |
51bf9bdf AC |
6401 | and then (not Is_Hidden (Overridden_Subp) |
6402 | or else | |
6403 | ((Chars (Overridden_Subp) = Name_Initialize | |
f0709ca6 AC |
6404 | or else |
6405 | Chars (Overridden_Subp) = Name_Adjust | |
6406 | or else | |
6407 | Chars (Overridden_Subp) = Name_Finalize) | |
6408 | and then Present (Alias (Overridden_Subp)) | |
6409 | and then not Is_Hidden (Alias (Overridden_Subp)))) | |
fd0d899b | 6410 | then |
ec4867fa ES |
6411 | if Must_Not_Override (Spec) then |
6412 | Error_Msg_Sloc := Sloc (Overridden_Subp); | |
fbf5a39b | 6413 | |
ec4867fa | 6414 | if Ekind (Subp) = E_Entry then |
ed2233dc | 6415 | Error_Msg_NE |
5d37ba92 | 6416 | ("entry & overrides inherited operation #", Spec, Subp); |
ec4867fa | 6417 | else |
ed2233dc | 6418 | Error_Msg_NE |
5d37ba92 | 6419 | ("subprogram & overrides inherited operation #", Spec, Subp); |
ec4867fa | 6420 | end if; |
21d27997 | 6421 | |
bd603506 | 6422 | -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
24a120ac AC |
6423 | -- as an extension of Root_Controlled, and thus has a useless Adjust |
6424 | -- operation. This operation should not be inherited by other limited | |
6425 | -- controlled types. An explicit Adjust for them is not overriding. | |
6426 | ||
6427 | elsif Must_Override (Spec) | |
6428 | and then Chars (Overridden_Subp) = Name_Adjust | |
6429 | and then Is_Limited_Type (Etype (First_Formal (Subp))) | |
6430 | and then Present (Alias (Overridden_Subp)) | |
bd603506 RD |
6431 | and then |
6432 | Is_Predefined_File_Name | |
6433 | (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))) | |
24a120ac AC |
6434 | then |
6435 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
6436 | ||
21d27997 | 6437 | elsif Is_Subprogram (Subp) then |
2fe829ae ES |
6438 | if Is_Init_Proc (Subp) then |
6439 | null; | |
6440 | ||
6441 | elsif No (Overridden_Operation (Subp)) then | |
1c1289e7 AC |
6442 | |
6443 | -- For entities generated by Derive_Subprograms the overridden | |
6444 | -- operation is the inherited primitive (which is available | |
6445 | -- through the attribute alias) | |
6446 | ||
6447 | if (Is_Dispatching_Operation (Subp) | |
f9673bb0 | 6448 | or else Is_Dispatching_Operation (Overridden_Subp)) |
1c1289e7 | 6449 | and then not Comes_From_Source (Overridden_Subp) |
f9673bb0 AC |
6450 | and then Find_Dispatching_Type (Overridden_Subp) = |
6451 | Find_Dispatching_Type (Subp) | |
1c1289e7 AC |
6452 | and then Present (Alias (Overridden_Subp)) |
6453 | and then Comes_From_Source (Alias (Overridden_Subp)) | |
6454 | then | |
6455 | Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); | |
2fe829ae | 6456 | |
1c1289e7 AC |
6457 | else |
6458 | Set_Overridden_Operation (Subp, Overridden_Subp); | |
6459 | end if; | |
6460 | end if; | |
ec4867fa | 6461 | end if; |
f937473f | 6462 | |
618fb570 AC |
6463 | -- If primitive flag is set or this is a protected operation, then |
6464 | -- the operation is overriding at the point of its declaration, so | |
6465 | -- warn if necessary. Otherwise it may have been declared before the | |
6466 | -- operation it overrides and no check is required. | |
3c25856a AC |
6467 | |
6468 | if Style_Check | |
618fb570 AC |
6469 | and then not Must_Override (Spec) |
6470 | and then (Is_Primitive | |
6471 | or else Ekind (Scope (Subp)) = E_Protected_Type) | |
3c25856a | 6472 | then |
235f4375 AC |
6473 | Style.Missing_Overriding (Decl, Subp); |
6474 | end if; | |
6475 | ||
53b10ce9 AC |
6476 | -- If Subp is an operator, it may override a predefined operation, if |
6477 | -- it is defined in the same scope as the type to which it applies. | |
676e8420 | 6478 | -- In that case Overridden_Subp is empty because of our implicit |
5d37ba92 ES |
6479 | -- representation for predefined operators. We have to check whether the |
6480 | -- signature of Subp matches that of a predefined operator. Note that | |
6481 | -- first argument provides the name of the operator, and the second | |
6482 | -- argument the signature that may match that of a standard operation. | |
21d27997 RD |
6483 | -- If the indicator is overriding, then the operator must match a |
6484 | -- predefined signature, because we know already that there is no | |
6485 | -- explicit overridden operation. | |
f937473f | 6486 | |
21d27997 | 6487 | elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
806f6d37 | 6488 | if Must_Not_Override (Spec) then |
f937473f | 6489 | |
806f6d37 AC |
6490 | -- If this is not a primitive or a protected subprogram, then |
6491 | -- "not overriding" is illegal. | |
618fb570 | 6492 | |
806f6d37 AC |
6493 | if not Is_Primitive |
6494 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
6495 | then | |
6496 | Error_Msg_N | |
6497 | ("overriding indicator only allowed " | |
6498 | & "if subprogram is primitive", Subp); | |
618fb570 | 6499 | |
806f6d37 AC |
6500 | elsif Can_Override_Operator (Subp) then |
6501 | Error_Msg_NE | |
6502 | ("subprogram& overrides predefined operator ", Spec, Subp); | |
6503 | end if; | |
f937473f | 6504 | |
806f6d37 AC |
6505 | elsif Must_Override (Spec) then |
6506 | if No (Overridden_Operation (Subp)) | |
6507 | and then not Can_Override_Operator (Subp) | |
6508 | then | |
6509 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); | |
6510 | end if; | |
5d37ba92 | 6511 | |
806f6d37 AC |
6512 | elsif not Error_Posted (Subp) |
6513 | and then Style_Check | |
6514 | and then Can_Override_Operator (Subp) | |
6515 | and then | |
6516 | not Is_Predefined_File_Name | |
6517 | (Unit_File_Name (Get_Source_Unit (Subp))) | |
6518 | then | |
6519 | -- If style checks are enabled, indicate that the indicator is | |
6520 | -- missing. However, at the point of declaration, the type of | |
6521 | -- which this is a primitive operation may be private, in which | |
6522 | -- case the indicator would be premature. | |
235f4375 | 6523 | |
806f6d37 AC |
6524 | if Has_Private_Declaration (Etype (Subp)) |
6525 | or else Has_Private_Declaration (Etype (First_Formal (Subp))) | |
53b10ce9 | 6526 | then |
806f6d37 AC |
6527 | null; |
6528 | else | |
6529 | Style.Missing_Overriding (Decl, Subp); | |
5d5832bc | 6530 | end if; |
806f6d37 | 6531 | end if; |
21d27997 RD |
6532 | |
6533 | elsif Must_Override (Spec) then | |
6534 | if Ekind (Subp) = E_Entry then | |
ed2233dc | 6535 | Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
5d37ba92 | 6536 | else |
ed2233dc | 6537 | Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
758c442c | 6538 | end if; |
5d37ba92 ES |
6539 | |
6540 | -- If the operation is marked "not overriding" and it's not primitive | |
6541 | -- then an error is issued, unless this is an operation of a task or | |
6542 | -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" | |
6543 | -- has been specified have already been checked above. | |
6544 | ||
6545 | elsif Must_Not_Override (Spec) | |
6546 | and then not Is_Primitive | |
6547 | and then Ekind (Subp) /= E_Entry | |
6548 | and then Ekind (Scope (Subp)) /= E_Protected_Type | |
6549 | then | |
ed2233dc | 6550 | Error_Msg_N |
5d37ba92 ES |
6551 | ("overriding indicator only allowed if subprogram is primitive", |
6552 | Subp); | |
5d37ba92 | 6553 | return; |
fbf5a39b | 6554 | end if; |
758c442c | 6555 | end Check_Overriding_Indicator; |
fbf5a39b | 6556 | |
996ae0b0 RK |
6557 | ------------------- |
6558 | -- Check_Returns -- | |
6559 | ------------------- | |
6560 | ||
0a36105d JM |
6561 | -- Note: this procedure needs to know far too much about how the expander |
6562 | -- messes with exceptions. The use of the flag Exception_Junk and the | |
6563 | -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers | |
6564 | -- works, but is not very clean. It would be better if the expansion | |
6565 | -- routines would leave Original_Node working nicely, and we could use | |
6566 | -- Original_Node here to ignore all the peculiar expander messing ??? | |
6567 | ||
996ae0b0 RK |
6568 | procedure Check_Returns |
6569 | (HSS : Node_Id; | |
6570 | Mode : Character; | |
c8ef728f ES |
6571 | Err : out Boolean; |
6572 | Proc : Entity_Id := Empty) | |
996ae0b0 RK |
6573 | is |
6574 | Handler : Node_Id; | |
6575 | ||
6576 | procedure Check_Statement_Sequence (L : List_Id); | |
6577 | -- Internal recursive procedure to check a list of statements for proper | |
6578 | -- termination by a return statement (or a transfer of control or a | |
6579 | -- compound statement that is itself internally properly terminated). | |
6580 | ||
6581 | ------------------------------ | |
6582 | -- Check_Statement_Sequence -- | |
6583 | ------------------------------ | |
6584 | ||
6585 | procedure Check_Statement_Sequence (L : List_Id) is | |
6586 | Last_Stm : Node_Id; | |
0a36105d | 6587 | Stm : Node_Id; |
996ae0b0 RK |
6588 | Kind : Node_Kind; |
6589 | ||
6590 | Raise_Exception_Call : Boolean; | |
6591 | -- Set True if statement sequence terminated by Raise_Exception call | |
6592 | -- or a Reraise_Occurrence call. | |
6593 | ||
6594 | begin | |
6595 | Raise_Exception_Call := False; | |
6596 | ||
6597 | -- Get last real statement | |
6598 | ||
6599 | Last_Stm := Last (L); | |
6600 | ||
0a36105d JM |
6601 | -- Deal with digging out exception handler statement sequences that |
6602 | -- have been transformed by the local raise to goto optimization. | |
6603 | -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this | |
6604 | -- optimization has occurred, we are looking at something like: | |
6605 | ||
6606 | -- begin | |
6607 | -- original stmts in block | |
6608 | ||
6609 | -- exception \ | |
6610 | -- when excep1 => | | |
6611 | -- goto L1; | omitted if No_Exception_Propagation | |
6612 | -- when excep2 => | | |
6613 | -- goto L2; / | |
6614 | -- end; | |
6615 | ||
6616 | -- goto L3; -- skip handler when exception not raised | |
6617 | ||
6618 | -- <<L1>> -- target label for local exception | |
6619 | -- begin | |
6620 | -- estmts1 | |
6621 | -- end; | |
6622 | ||
6623 | -- goto L3; | |
6624 | ||
6625 | -- <<L2>> | |
6626 | -- begin | |
6627 | -- estmts2 | |
6628 | -- end; | |
6629 | ||
6630 | -- <<L3>> | |
6631 | ||
6632 | -- and what we have to do is to dig out the estmts1 and estmts2 | |
6633 | -- sequences (which were the original sequences of statements in | |
6634 | -- the exception handlers) and check them. | |
6635 | ||
6636 | if Nkind (Last_Stm) = N_Label | |
6637 | and then Exception_Junk (Last_Stm) | |
6638 | then | |
6639 | Stm := Last_Stm; | |
6640 | loop | |
6641 | Prev (Stm); | |
6642 | exit when No (Stm); | |
6643 | exit when Nkind (Stm) /= N_Block_Statement; | |
6644 | exit when not Exception_Junk (Stm); | |
6645 | Prev (Stm); | |
6646 | exit when No (Stm); | |
6647 | exit when Nkind (Stm) /= N_Label; | |
6648 | exit when not Exception_Junk (Stm); | |
6649 | Check_Statement_Sequence | |
6650 | (Statements (Handled_Statement_Sequence (Next (Stm)))); | |
6651 | ||
6652 | Prev (Stm); | |
6653 | Last_Stm := Stm; | |
6654 | exit when No (Stm); | |
6655 | exit when Nkind (Stm) /= N_Goto_Statement; | |
6656 | exit when not Exception_Junk (Stm); | |
6657 | end loop; | |
6658 | end if; | |
6659 | ||
996ae0b0 RK |
6660 | -- Don't count pragmas |
6661 | ||
6662 | while Nkind (Last_Stm) = N_Pragma | |
6663 | ||
6664 | -- Don't count call to SS_Release (can happen after Raise_Exception) | |
6665 | ||
6666 | or else | |
6667 | (Nkind (Last_Stm) = N_Procedure_Call_Statement | |
6668 | and then | |
6669 | Nkind (Name (Last_Stm)) = N_Identifier | |
6670 | and then | |
6671 | Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) | |
6672 | ||
6673 | -- Don't count exception junk | |
6674 | ||
6675 | or else | |
800621e0 RD |
6676 | (Nkind_In (Last_Stm, N_Goto_Statement, |
6677 | N_Label, | |
6678 | N_Object_Declaration) | |
0a36105d JM |
6679 | and then Exception_Junk (Last_Stm)) |
6680 | or else Nkind (Last_Stm) in N_Push_xxx_Label | |
6681 | or else Nkind (Last_Stm) in N_Pop_xxx_Label | |
996ae0b0 RK |
6682 | loop |
6683 | Prev (Last_Stm); | |
6684 | end loop; | |
6685 | ||
6686 | -- Here we have the "real" last statement | |
6687 | ||
6688 | Kind := Nkind (Last_Stm); | |
6689 | ||
6690 | -- Transfer of control, OK. Note that in the No_Return procedure | |
6691 | -- case, we already diagnosed any explicit return statements, so | |
6692 | -- we can treat them as OK in this context. | |
6693 | ||
6694 | if Is_Transfer (Last_Stm) then | |
6695 | return; | |
6696 | ||
6697 | -- Check cases of explicit non-indirect procedure calls | |
6698 | ||
6699 | elsif Kind = N_Procedure_Call_Statement | |
6700 | and then Is_Entity_Name (Name (Last_Stm)) | |
6701 | then | |
6702 | -- Check call to Raise_Exception procedure which is treated | |
6703 | -- specially, as is a call to Reraise_Occurrence. | |
6704 | ||
6705 | -- We suppress the warning in these cases since it is likely that | |
6706 | -- the programmer really does not expect to deal with the case | |
6707 | -- of Null_Occurrence, and thus would find a warning about a | |
6708 | -- missing return curious, and raising Program_Error does not | |
6709 | -- seem such a bad behavior if this does occur. | |
6710 | ||
c8ef728f ES |
6711 | -- Note that in the Ada 2005 case for Raise_Exception, the actual |
6712 | -- behavior will be to raise Constraint_Error (see AI-329). | |
6713 | ||
996ae0b0 RK |
6714 | if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
6715 | or else | |
6716 | Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) | |
6717 | then | |
6718 | Raise_Exception_Call := True; | |
6719 | ||
6720 | -- For Raise_Exception call, test first argument, if it is | |
6721 | -- an attribute reference for a 'Identity call, then we know | |
6722 | -- that the call cannot possibly return. | |
6723 | ||
6724 | declare | |
6725 | Arg : constant Node_Id := | |
6726 | Original_Node (First_Actual (Last_Stm)); | |
996ae0b0 RK |
6727 | begin |
6728 | if Nkind (Arg) = N_Attribute_Reference | |
6729 | and then Attribute_Name (Arg) = Name_Identity | |
6730 | then | |
6731 | return; | |
6732 | end if; | |
6733 | end; | |
6734 | end if; | |
6735 | ||
6736 | -- If statement, need to look inside if there is an else and check | |
6737 | -- each constituent statement sequence for proper termination. | |
6738 | ||
6739 | elsif Kind = N_If_Statement | |
6740 | and then Present (Else_Statements (Last_Stm)) | |
6741 | then | |
6742 | Check_Statement_Sequence (Then_Statements (Last_Stm)); | |
6743 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6744 | ||
6745 | if Present (Elsif_Parts (Last_Stm)) then | |
6746 | declare | |
6747 | Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); | |
6748 | ||
6749 | begin | |
6750 | while Present (Elsif_Part) loop | |
6751 | Check_Statement_Sequence (Then_Statements (Elsif_Part)); | |
6752 | Next (Elsif_Part); | |
6753 | end loop; | |
6754 | end; | |
6755 | end if; | |
6756 | ||
6757 | return; | |
6758 | ||
6759 | -- Case statement, check each case for proper termination | |
6760 | ||
6761 | elsif Kind = N_Case_Statement then | |
6762 | declare | |
6763 | Case_Alt : Node_Id; | |
996ae0b0 RK |
6764 | begin |
6765 | Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); | |
6766 | while Present (Case_Alt) loop | |
6767 | Check_Statement_Sequence (Statements (Case_Alt)); | |
6768 | Next_Non_Pragma (Case_Alt); | |
6769 | end loop; | |
6770 | end; | |
6771 | ||
6772 | return; | |
6773 | ||
6774 | -- Block statement, check its handled sequence of statements | |
6775 | ||
6776 | elsif Kind = N_Block_Statement then | |
6777 | declare | |
6778 | Err1 : Boolean; | |
6779 | ||
6780 | begin | |
6781 | Check_Returns | |
6782 | (Handled_Statement_Sequence (Last_Stm), Mode, Err1); | |
6783 | ||
6784 | if Err1 then | |
6785 | Err := True; | |
6786 | end if; | |
6787 | ||
6788 | return; | |
6789 | end; | |
6790 | ||
6791 | -- Loop statement. If there is an iteration scheme, we can definitely | |
6792 | -- fall out of the loop. Similarly if there is an exit statement, we | |
6793 | -- can fall out. In either case we need a following return. | |
6794 | ||
6795 | elsif Kind = N_Loop_Statement then | |
6796 | if Present (Iteration_Scheme (Last_Stm)) | |
6797 | or else Has_Exit (Entity (Identifier (Last_Stm))) | |
6798 | then | |
6799 | null; | |
6800 | ||
f3d57416 RW |
6801 | -- A loop with no exit statement or iteration scheme is either |
6802 | -- an infinite loop, or it has some other exit (raise/return). | |
996ae0b0 RK |
6803 | -- In either case, no warning is required. |
6804 | ||
6805 | else | |
6806 | return; | |
6807 | end if; | |
6808 | ||
6809 | -- Timed entry call, check entry call and delay alternatives | |
6810 | ||
6811 | -- Note: in expanded code, the timed entry call has been converted | |
6812 | -- to a set of expanded statements on which the check will work | |
6813 | -- correctly in any case. | |
6814 | ||
6815 | elsif Kind = N_Timed_Entry_Call then | |
6816 | declare | |
6817 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6818 | DCA : constant Node_Id := Delay_Alternative (Last_Stm); | |
6819 | ||
6820 | begin | |
6821 | -- If statement sequence of entry call alternative is missing, | |
6822 | -- then we can definitely fall through, and we post the error | |
6823 | -- message on the entry call alternative itself. | |
6824 | ||
6825 | if No (Statements (ECA)) then | |
6826 | Last_Stm := ECA; | |
6827 | ||
6828 | -- If statement sequence of delay alternative is missing, then | |
6829 | -- we can definitely fall through, and we post the error | |
6830 | -- message on the delay alternative itself. | |
6831 | ||
6832 | -- Note: if both ECA and DCA are missing the return, then we | |
6833 | -- post only one message, should be enough to fix the bugs. | |
6834 | -- If not we will get a message next time on the DCA when the | |
6835 | -- ECA is fixed! | |
6836 | ||
6837 | elsif No (Statements (DCA)) then | |
6838 | Last_Stm := DCA; | |
6839 | ||
6840 | -- Else check both statement sequences | |
6841 | ||
6842 | else | |
6843 | Check_Statement_Sequence (Statements (ECA)); | |
6844 | Check_Statement_Sequence (Statements (DCA)); | |
6845 | return; | |
6846 | end if; | |
6847 | end; | |
6848 | ||
6849 | -- Conditional entry call, check entry call and else part | |
6850 | ||
6851 | -- Note: in expanded code, the conditional entry call has been | |
6852 | -- converted to a set of expanded statements on which the check | |
6853 | -- will work correctly in any case. | |
6854 | ||
6855 | elsif Kind = N_Conditional_Entry_Call then | |
6856 | declare | |
6857 | ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); | |
6858 | ||
6859 | begin | |
6860 | -- If statement sequence of entry call alternative is missing, | |
6861 | -- then we can definitely fall through, and we post the error | |
6862 | -- message on the entry call alternative itself. | |
6863 | ||
6864 | if No (Statements (ECA)) then | |
6865 | Last_Stm := ECA; | |
6866 | ||
6867 | -- Else check statement sequence and else part | |
6868 | ||
6869 | else | |
6870 | Check_Statement_Sequence (Statements (ECA)); | |
6871 | Check_Statement_Sequence (Else_Statements (Last_Stm)); | |
6872 | return; | |
6873 | end if; | |
6874 | end; | |
6875 | end if; | |
6876 | ||
6877 | -- If we fall through, issue appropriate message | |
6878 | ||
6879 | if Mode = 'F' then | |
996ae0b0 RK |
6880 | if not Raise_Exception_Call then |
6881 | Error_Msg_N | |
5d37ba92 | 6882 | ("?RETURN statement missing following this statement!", |
996ae0b0 RK |
6883 | Last_Stm); |
6884 | Error_Msg_N | |
5d37ba92 | 6885 | ("\?Program_Error may be raised at run time!", |
996ae0b0 RK |
6886 | Last_Stm); |
6887 | end if; | |
6888 | ||
6889 | -- Note: we set Err even though we have not issued a warning | |
6890 | -- because we still have a case of a missing return. This is | |
6891 | -- an extremely marginal case, probably will never be noticed | |
6892 | -- but we might as well get it right. | |
6893 | ||
6894 | Err := True; | |
6895 | ||
c8ef728f ES |
6896 | -- Otherwise we have the case of a procedure marked No_Return |
6897 | ||
996ae0b0 | 6898 | else |
800621e0 RD |
6899 | if not Raise_Exception_Call then |
6900 | Error_Msg_N | |
6901 | ("?implied return after this statement " & | |
6902 | "will raise Program_Error", | |
6903 | Last_Stm); | |
6904 | Error_Msg_NE | |
6905 | ("\?procedure & is marked as No_Return!", | |
6906 | Last_Stm, Proc); | |
6907 | end if; | |
c8ef728f ES |
6908 | |
6909 | declare | |
6910 | RE : constant Node_Id := | |
6911 | Make_Raise_Program_Error (Sloc (Last_Stm), | |
6912 | Reason => PE_Implicit_Return); | |
6913 | begin | |
6914 | Insert_After (Last_Stm, RE); | |
6915 | Analyze (RE); | |
6916 | end; | |
996ae0b0 RK |
6917 | end if; |
6918 | end Check_Statement_Sequence; | |
6919 | ||
6920 | -- Start of processing for Check_Returns | |
6921 | ||
6922 | begin | |
6923 | Err := False; | |
6924 | Check_Statement_Sequence (Statements (HSS)); | |
6925 | ||
6926 | if Present (Exception_Handlers (HSS)) then | |
6927 | Handler := First_Non_Pragma (Exception_Handlers (HSS)); | |
6928 | while Present (Handler) loop | |
6929 | Check_Statement_Sequence (Statements (Handler)); | |
6930 | Next_Non_Pragma (Handler); | |
6931 | end loop; | |
6932 | end if; | |
6933 | end Check_Returns; | |
6934 | ||
67c86178 AC |
6935 | ------------------------------- |
6936 | -- Check_Subprogram_Contract -- | |
6937 | ------------------------------- | |
6938 | ||
6939 | procedure Check_Subprogram_Contract (Spec_Id : Entity_Id) is | |
6940 | ||
029b67ba YM |
6941 | -- Code is currently commented out as, in some cases, it causes crashes |
6942 | -- because Direct_Primitive_Operations is not available for a private | |
6943 | -- type. This may cause more warnings to be issued than necessary. See | |
6944 | -- below for the intended use of this variable. ??? | |
6945 | ||
67c86178 AC |
6946 | -- Inherited : constant Subprogram_List := |
6947 | -- Inherited_Subprograms (Spec_Id); | |
dc36a7e3 | 6948 | -- -- List of subprograms inherited by this subprogram |
67c86178 | 6949 | |
dc36a7e3 | 6950 | Last_Postcondition : Node_Id := Empty; |
67c86178 AC |
6951 | -- Last postcondition on the subprogram, or else Empty if either no |
6952 | -- postcondition or only inherited postconditions. | |
6953 | ||
6954 | Attribute_Result_Mentioned : Boolean := False; | |
6955 | -- Whether attribute 'Result is mentioned in a postcondition | |
6956 | ||
dc36a7e3 | 6957 | Post_State_Mentioned : Boolean := False; |
67c86178 AC |
6958 | -- Whether some expression mentioned in a postcondition can have a |
6959 | -- different value in the post-state than in the pre-state. | |
6960 | ||
6961 | function Check_Attr_Result (N : Node_Id) return Traverse_Result; | |
dc36a7e3 RD |
6962 | -- Check if N is a reference to the attribute 'Result, and if so set |
6963 | -- Attribute_Result_Mentioned and return Abandon. Otherwise return OK. | |
67c86178 AC |
6964 | |
6965 | function Check_Post_State (N : Node_Id) return Traverse_Result; | |
6966 | -- Check whether the value of evaluating N can be different in the | |
6967 | -- post-state, compared to the same evaluation in the pre-state, and | |
6968 | -- if so set Post_State_Mentioned and return Abandon. Return Skip on | |
6969 | -- reference to attribute 'Old, in order to ignore its prefix, which | |
6970 | -- is precisely evaluated in the pre-state. Otherwise return OK. | |
6971 | ||
dc36a7e3 | 6972 | procedure Process_Post_Conditions (Spec : Node_Id; Class : Boolean); |
67c86178 AC |
6973 | -- This processes the Spec_PPC_List from Spec, processing any |
6974 | -- postconditions from the list. If Class is True, then only | |
6975 | -- postconditions marked with Class_Present are considered. The | |
6976 | -- caller has checked that Spec_PPC_List is non-Empty. | |
6977 | ||
6978 | function Find_Attribute_Result is new Traverse_Func (Check_Attr_Result); | |
6979 | ||
6980 | function Find_Post_State is new Traverse_Func (Check_Post_State); | |
6981 | ||
6982 | ----------------------- | |
6983 | -- Check_Attr_Result -- | |
6984 | ----------------------- | |
6985 | ||
6986 | function Check_Attr_Result (N : Node_Id) return Traverse_Result is | |
6987 | begin | |
6988 | if Nkind (N) = N_Attribute_Reference | |
dc36a7e3 | 6989 | and then Get_Attribute_Id (Attribute_Name (N)) = Attribute_Result |
67c86178 AC |
6990 | then |
6991 | Attribute_Result_Mentioned := True; | |
6992 | return Abandon; | |
6993 | else | |
6994 | return OK; | |
6995 | end if; | |
6996 | end Check_Attr_Result; | |
6997 | ||
6998 | ---------------------- | |
6999 | -- Check_Post_State -- | |
7000 | ---------------------- | |
7001 | ||
7002 | function Check_Post_State (N : Node_Id) return Traverse_Result is | |
7003 | Found : Boolean := False; | |
7004 | ||
7005 | begin | |
7006 | case Nkind (N) is | |
7007 | when N_Function_Call | | |
7008 | N_Explicit_Dereference => | |
7009 | Found := True; | |
7010 | ||
7011 | when N_Identifier | | |
7012 | N_Expanded_Name => | |
dc36a7e3 | 7013 | |
67c86178 AC |
7014 | declare |
7015 | E : constant Entity_Id := Entity (N); | |
bd38b431 | 7016 | |
67c86178 | 7017 | begin |
bd38b431 AC |
7018 | -- ???Quantified expressions get analyzed later, so E can |
7019 | -- be empty at this point. In this case, we suppress the | |
5b5588dd AC |
7020 | -- warning, just in case E is assignable. It seems better to |
7021 | -- have false negatives than false positives. At some point, | |
7022 | -- we should make the warning more accurate, either by | |
bd38b431 AC |
7023 | -- analyzing quantified expressions earlier, or moving |
7024 | -- this processing later. | |
5b5588dd | 7025 | |
bd38b431 AC |
7026 | if No (E) |
7027 | or else | |
7028 | (Is_Entity_Name (N) | |
7029 | and then Ekind (E) in Assignable_Kind) | |
67c86178 AC |
7030 | then |
7031 | Found := True; | |
7032 | end if; | |
7033 | end; | |
7034 | ||
7035 | when N_Attribute_Reference => | |
7036 | case Get_Attribute_Id (Attribute_Name (N)) is | |
7037 | when Attribute_Old => | |
7038 | return Skip; | |
7039 | when Attribute_Result => | |
7040 | Found := True; | |
7041 | when others => | |
7042 | null; | |
7043 | end case; | |
7044 | ||
7045 | when others => | |
7046 | null; | |
7047 | end case; | |
7048 | ||
7049 | if Found then | |
7050 | Post_State_Mentioned := True; | |
7051 | return Abandon; | |
7052 | else | |
7053 | return OK; | |
7054 | end if; | |
7055 | end Check_Post_State; | |
7056 | ||
7057 | ----------------------------- | |
7058 | -- Process_Post_Conditions -- | |
7059 | ----------------------------- | |
7060 | ||
7061 | procedure Process_Post_Conditions | |
7062 | (Spec : Node_Id; | |
7063 | Class : Boolean) | |
7064 | is | |
7065 | Prag : Node_Id; | |
7066 | Arg : Node_Id; | |
7067 | Ignored : Traverse_Final_Result; | |
7068 | pragma Unreferenced (Ignored); | |
7069 | ||
7070 | begin | |
7071 | Prag := Spec_PPC_List (Contract (Spec)); | |
7072 | ||
7073 | loop | |
7074 | Arg := First (Pragma_Argument_Associations (Prag)); | |
7075 | ||
dc36a7e3 | 7076 | -- Since pre- and post-conditions are listed in reverse order, the |
67c86178 AC |
7077 | -- first postcondition in the list is the last in the source. |
7078 | ||
7079 | if Pragma_Name (Prag) = Name_Postcondition | |
7080 | and then not Class | |
7081 | and then No (Last_Postcondition) | |
7082 | then | |
7083 | Last_Postcondition := Prag; | |
7084 | end if; | |
7085 | ||
7086 | -- For functions, look for presence of 'Result in postcondition | |
7087 | ||
7088 | if Ekind_In (Spec_Id, E_Function, E_Generic_Function) then | |
7089 | Ignored := Find_Attribute_Result (Arg); | |
7090 | end if; | |
7091 | ||
7092 | -- For each individual non-inherited postcondition, look for | |
7093 | -- presence of an expression that could be evaluated differently | |
7094 | -- in post-state. | |
7095 | ||
7096 | if Pragma_Name (Prag) = Name_Postcondition | |
7097 | and then not Class | |
7098 | then | |
7099 | Post_State_Mentioned := False; | |
dc36a7e3 | 7100 | Ignored := Find_Post_State (Arg); |
67c86178 AC |
7101 | |
7102 | if not Post_State_Mentioned then | |
5b5588dd | 7103 | Error_Msg_N ("?postcondition refers only to pre-state", |
67c86178 AC |
7104 | Prag); |
7105 | end if; | |
7106 | end if; | |
7107 | ||
7108 | Prag := Next_Pragma (Prag); | |
7109 | exit when No (Prag); | |
7110 | end loop; | |
7111 | end Process_Post_Conditions; | |
7112 | ||
7113 | -- Start of processing for Check_Subprogram_Contract | |
7114 | ||
7115 | begin | |
7116 | if not Warn_On_Suspicious_Contract then | |
7117 | return; | |
7118 | end if; | |
7119 | ||
7120 | if Present (Spec_PPC_List (Contract (Spec_Id))) then | |
7121 | Process_Post_Conditions (Spec_Id, Class => False); | |
7122 | end if; | |
7123 | ||
7124 | -- Process inherited postconditions | |
7125 | ||
7126 | -- Code is currently commented out as, in some cases, it causes crashes | |
7127 | -- because Direct_Primitive_Operations is not available for a private | |
dc36a7e3 | 7128 | -- type. This may cause more warnings to be issued than necessary. ??? |
67c86178 AC |
7129 | |
7130 | -- for J in Inherited'Range loop | |
7131 | -- if Present (Spec_PPC_List (Contract (Inherited (J)))) then | |
7132 | -- Process_Post_Conditions (Inherited (J), Class => True); | |
7133 | -- end if; | |
7134 | -- end loop; | |
7135 | ||
7136 | -- Issue warning for functions whose postcondition does not mention | |
7137 | -- 'Result after all postconditions have been processed. | |
7138 | ||
7139 | if Ekind_In (Spec_Id, E_Function, E_Generic_Function) | |
7140 | and then Present (Last_Postcondition) | |
7141 | and then not Attribute_Result_Mentioned | |
7142 | then | |
7143 | Error_Msg_N ("?function postcondition does not mention result", | |
7144 | Last_Postcondition); | |
7145 | end if; | |
7146 | end Check_Subprogram_Contract; | |
7147 | ||
996ae0b0 RK |
7148 | ---------------------------- |
7149 | -- Check_Subprogram_Order -- | |
7150 | ---------------------------- | |
7151 | ||
7152 | procedure Check_Subprogram_Order (N : Node_Id) is | |
7153 | ||
7154 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean; | |
dc36a7e3 RD |
7155 | -- This is used to check if S1 > S2 in the sense required by this test, |
7156 | -- for example nameab < namec, but name2 < name10. | |
996ae0b0 | 7157 | |
82c80734 RD |
7158 | ----------------------------- |
7159 | -- Subprogram_Name_Greater -- | |
7160 | ----------------------------- | |
7161 | ||
996ae0b0 RK |
7162 | function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
7163 | L1, L2 : Positive; | |
7164 | N1, N2 : Natural; | |
7165 | ||
7166 | begin | |
7167 | -- Remove trailing numeric parts | |
7168 | ||
7169 | L1 := S1'Last; | |
7170 | while S1 (L1) in '0' .. '9' loop | |
7171 | L1 := L1 - 1; | |
7172 | end loop; | |
7173 | ||
7174 | L2 := S2'Last; | |
7175 | while S2 (L2) in '0' .. '9' loop | |
7176 | L2 := L2 - 1; | |
7177 | end loop; | |
7178 | ||
7179 | -- If non-numeric parts non-equal, that's decisive | |
7180 | ||
7181 | if S1 (S1'First .. L1) < S2 (S2'First .. L2) then | |
7182 | return False; | |
7183 | ||
7184 | elsif S1 (S1'First .. L1) > S2 (S2'First .. L2) then | |
7185 | return True; | |
7186 | ||
7187 | -- If non-numeric parts equal, compare suffixed numeric parts. Note | |
7188 | -- that a missing suffix is treated as numeric zero in this test. | |
7189 | ||
7190 | else | |
7191 | N1 := 0; | |
7192 | while L1 < S1'Last loop | |
7193 | L1 := L1 + 1; | |
7194 | N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); | |
7195 | end loop; | |
7196 | ||
7197 | N2 := 0; | |
7198 | while L2 < S2'Last loop | |
7199 | L2 := L2 + 1; | |
7200 | N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); | |
7201 | end loop; | |
7202 | ||
7203 | return N1 > N2; | |
7204 | end if; | |
7205 | end Subprogram_Name_Greater; | |
7206 | ||
7207 | -- Start of processing for Check_Subprogram_Order | |
7208 | ||
7209 | begin | |
7210 | -- Check body in alpha order if this is option | |
7211 | ||
fbf5a39b | 7212 | if Style_Check |
bc202b70 | 7213 | and then Style_Check_Order_Subprograms |
996ae0b0 RK |
7214 | and then Nkind (N) = N_Subprogram_Body |
7215 | and then Comes_From_Source (N) | |
7216 | and then In_Extended_Main_Source_Unit (N) | |
7217 | then | |
7218 | declare | |
7219 | LSN : String_Ptr | |
7220 | renames Scope_Stack.Table | |
7221 | (Scope_Stack.Last).Last_Subprogram_Name; | |
7222 | ||
7223 | Body_Id : constant Entity_Id := | |
7224 | Defining_Entity (Specification (N)); | |
7225 | ||
7226 | begin | |
7227 | Get_Decoded_Name_String (Chars (Body_Id)); | |
7228 | ||
7229 | if LSN /= null then | |
7230 | if Subprogram_Name_Greater | |
7231 | (LSN.all, Name_Buffer (1 .. Name_Len)) | |
7232 | then | |
7233 | Style.Subprogram_Not_In_Alpha_Order (Body_Id); | |
7234 | end if; | |
7235 | ||
7236 | Free (LSN); | |
7237 | end if; | |
7238 | ||
7239 | LSN := new String'(Name_Buffer (1 .. Name_Len)); | |
7240 | end; | |
7241 | end if; | |
7242 | end Check_Subprogram_Order; | |
7243 | ||
7244 | ------------------------------ | |
7245 | -- Check_Subtype_Conformant -- | |
7246 | ------------------------------ | |
7247 | ||
7248 | procedure Check_Subtype_Conformant | |
ce2b6ba5 JM |
7249 | (New_Id : Entity_Id; |
7250 | Old_Id : Entity_Id; | |
7251 | Err_Loc : Node_Id := Empty; | |
7252 | Skip_Controlling_Formals : Boolean := False) | |
996ae0b0 RK |
7253 | is |
7254 | Result : Boolean; | |
81db9d77 | 7255 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7256 | begin |
7257 | Check_Conformance | |
ce2b6ba5 JM |
7258 | (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
7259 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
7260 | end Check_Subtype_Conformant; |
7261 | ||
7262 | --------------------------- | |
7263 | -- Check_Type_Conformant -- | |
7264 | --------------------------- | |
7265 | ||
7266 | procedure Check_Type_Conformant | |
7267 | (New_Id : Entity_Id; | |
7268 | Old_Id : Entity_Id; | |
7269 | Err_Loc : Node_Id := Empty) | |
7270 | is | |
7271 | Result : Boolean; | |
81db9d77 | 7272 | pragma Warnings (Off, Result); |
996ae0b0 RK |
7273 | begin |
7274 | Check_Conformance | |
7275 | (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); | |
7276 | end Check_Type_Conformant; | |
7277 | ||
806f6d37 AC |
7278 | --------------------------- |
7279 | -- Can_Override_Operator -- | |
7280 | --------------------------- | |
7281 | ||
7282 | function Can_Override_Operator (Subp : Entity_Id) return Boolean is | |
7283 | Typ : Entity_Id; | |
7284 | begin | |
7285 | if Nkind (Subp) /= N_Defining_Operator_Symbol then | |
7286 | return False; | |
7287 | ||
7288 | else | |
7289 | Typ := Base_Type (Etype (First_Formal (Subp))); | |
7290 | ||
7291 | return Operator_Matches_Spec (Subp, Subp) | |
7292 | and then Scope (Subp) = Scope (Typ) | |
7293 | and then not Is_Class_Wide_Type (Typ); | |
7294 | end if; | |
7295 | end Can_Override_Operator; | |
7296 | ||
996ae0b0 RK |
7297 | ---------------------- |
7298 | -- Conforming_Types -- | |
7299 | ---------------------- | |
7300 | ||
7301 | function Conforming_Types | |
7302 | (T1 : Entity_Id; | |
7303 | T2 : Entity_Id; | |
7304 | Ctype : Conformance_Type; | |
d05ef0ab | 7305 | Get_Inst : Boolean := False) return Boolean |
996ae0b0 RK |
7306 | is |
7307 | Type_1 : Entity_Id := T1; | |
7308 | Type_2 : Entity_Id := T2; | |
af4b9434 | 7309 | Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
996ae0b0 RK |
7310 | |
7311 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean; | |
0a36105d JM |
7312 | -- If neither T1 nor T2 are generic actual types, or if they are in |
7313 | -- different scopes (e.g. parent and child instances), then verify that | |
7314 | -- the base types are equal. Otherwise T1 and T2 must be on the same | |
7315 | -- subtype chain. The whole purpose of this procedure is to prevent | |
7316 | -- spurious ambiguities in an instantiation that may arise if two | |
7317 | -- distinct generic types are instantiated with the same actual. | |
7318 | ||
5d37ba92 ES |
7319 | function Find_Designated_Type (T : Entity_Id) return Entity_Id; |
7320 | -- An access parameter can designate an incomplete type. If the | |
7321 | -- incomplete type is the limited view of a type from a limited_ | |
7322 | -- with_clause, check whether the non-limited view is available. If | |
7323 | -- it is a (non-limited) incomplete type, get the full view. | |
7324 | ||
0a36105d JM |
7325 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean; |
7326 | -- Returns True if and only if either T1 denotes a limited view of T2 | |
7327 | -- or T2 denotes a limited view of T1. This can arise when the limited | |
7328 | -- with view of a type is used in a subprogram declaration and the | |
7329 | -- subprogram body is in the scope of a regular with clause for the | |
7330 | -- same unit. In such a case, the two type entities can be considered | |
7331 | -- identical for purposes of conformance checking. | |
996ae0b0 RK |
7332 | |
7333 | ---------------------- | |
7334 | -- Base_Types_Match -- | |
7335 | ---------------------- | |
7336 | ||
7337 | function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is | |
7338 | begin | |
7339 | if T1 = T2 then | |
7340 | return True; | |
7341 | ||
7342 | elsif Base_Type (T1) = Base_Type (T2) then | |
7343 | ||
0a36105d | 7344 | -- The following is too permissive. A more precise test should |
996ae0b0 RK |
7345 | -- check that the generic actual is an ancestor subtype of the |
7346 | -- other ???. | |
7347 | ||
7348 | return not Is_Generic_Actual_Type (T1) | |
07fc65c4 GB |
7349 | or else not Is_Generic_Actual_Type (T2) |
7350 | or else Scope (T1) /= Scope (T2); | |
996ae0b0 | 7351 | |
0a36105d JM |
7352 | else |
7353 | return False; | |
7354 | end if; | |
7355 | end Base_Types_Match; | |
aa720a54 | 7356 | |
5d37ba92 ES |
7357 | -------------------------- |
7358 | -- Find_Designated_Type -- | |
7359 | -------------------------- | |
7360 | ||
7361 | function Find_Designated_Type (T : Entity_Id) return Entity_Id is | |
7362 | Desig : Entity_Id; | |
7363 | ||
7364 | begin | |
7365 | Desig := Directly_Designated_Type (T); | |
7366 | ||
7367 | if Ekind (Desig) = E_Incomplete_Type then | |
7368 | ||
7369 | -- If regular incomplete type, get full view if available | |
7370 | ||
7371 | if Present (Full_View (Desig)) then | |
7372 | Desig := Full_View (Desig); | |
7373 | ||
7374 | -- If limited view of a type, get non-limited view if available, | |
7375 | -- and check again for a regular incomplete type. | |
7376 | ||
7377 | elsif Present (Non_Limited_View (Desig)) then | |
7378 | Desig := Get_Full_View (Non_Limited_View (Desig)); | |
7379 | end if; | |
7380 | end if; | |
7381 | ||
7382 | return Desig; | |
7383 | end Find_Designated_Type; | |
7384 | ||
0a36105d JM |
7385 | ------------------------------- |
7386 | -- Matches_Limited_With_View -- | |
7387 | ------------------------------- | |
7388 | ||
7389 | function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is | |
7390 | begin | |
7391 | -- In some cases a type imported through a limited_with clause, and | |
7392 | -- its nonlimited view are both visible, for example in an anonymous | |
7393 | -- access-to-class-wide type in a formal. Both entities designate the | |
7394 | -- same type. | |
7395 | ||
7396 | if From_With_Type (T1) | |
7397 | and then T2 = Available_View (T1) | |
aa720a54 AC |
7398 | then |
7399 | return True; | |
7400 | ||
41251c60 | 7401 | elsif From_With_Type (T2) |
0a36105d | 7402 | and then T1 = Available_View (T2) |
41251c60 JM |
7403 | then |
7404 | return True; | |
3e24afaa AC |
7405 | |
7406 | elsif From_With_Type (T1) | |
7407 | and then From_With_Type (T2) | |
7408 | and then Available_View (T1) = Available_View (T2) | |
7409 | then | |
7410 | return True; | |
41251c60 | 7411 | |
996ae0b0 RK |
7412 | else |
7413 | return False; | |
7414 | end if; | |
0a36105d | 7415 | end Matches_Limited_With_View; |
996ae0b0 | 7416 | |
ec4867fa | 7417 | -- Start of processing for Conforming_Types |
758c442c | 7418 | |
996ae0b0 RK |
7419 | begin |
7420 | -- The context is an instance association for a formal | |
82c80734 RD |
7421 | -- access-to-subprogram type; the formal parameter types require |
7422 | -- mapping because they may denote other formal parameters of the | |
7423 | -- generic unit. | |
996ae0b0 RK |
7424 | |
7425 | if Get_Inst then | |
7426 | Type_1 := Get_Instance_Of (T1); | |
7427 | Type_2 := Get_Instance_Of (T2); | |
7428 | end if; | |
7429 | ||
0a36105d JM |
7430 | -- If one of the types is a view of the other introduced by a limited |
7431 | -- with clause, treat these as conforming for all purposes. | |
996ae0b0 | 7432 | |
0a36105d JM |
7433 | if Matches_Limited_With_View (T1, T2) then |
7434 | return True; | |
7435 | ||
7436 | elsif Base_Types_Match (Type_1, Type_2) then | |
996ae0b0 RK |
7437 | return Ctype <= Mode_Conformant |
7438 | or else Subtypes_Statically_Match (Type_1, Type_2); | |
7439 | ||
7440 | elsif Is_Incomplete_Or_Private_Type (Type_1) | |
7441 | and then Present (Full_View (Type_1)) | |
7442 | and then Base_Types_Match (Full_View (Type_1), Type_2) | |
7443 | then | |
7444 | return Ctype <= Mode_Conformant | |
7445 | or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); | |
7446 | ||
7447 | elsif Ekind (Type_2) = E_Incomplete_Type | |
7448 | and then Present (Full_View (Type_2)) | |
7449 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7450 | then | |
7451 | return Ctype <= Mode_Conformant | |
7452 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
fbf5a39b AC |
7453 | |
7454 | elsif Is_Private_Type (Type_2) | |
7455 | and then In_Instance | |
7456 | and then Present (Full_View (Type_2)) | |
7457 | and then Base_Types_Match (Type_1, Full_View (Type_2)) | |
7458 | then | |
7459 | return Ctype <= Mode_Conformant | |
7460 | or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); | |
996ae0b0 RK |
7461 | end if; |
7462 | ||
0a36105d | 7463 | -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
758c442c | 7464 | -- treated recursively because they carry a signature. |
af4b9434 AC |
7465 | |
7466 | Are_Anonymous_Access_To_Subprogram_Types := | |
f937473f RD |
7467 | Ekind (Type_1) = Ekind (Type_2) |
7468 | and then | |
800621e0 | 7469 | (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type |
f937473f RD |
7470 | or else |
7471 | Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type); | |
af4b9434 | 7472 | |
996ae0b0 | 7473 | -- Test anonymous access type case. For this case, static subtype |
5d37ba92 ES |
7474 | -- matching is required for mode conformance (RM 6.3.1(15)). We check |
7475 | -- the base types because we may have built internal subtype entities | |
7476 | -- to handle null-excluding types (see Process_Formals). | |
996ae0b0 | 7477 | |
5d37ba92 ES |
7478 | if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
7479 | and then | |
7480 | Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) | |
0ab80019 | 7481 | or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254) |
996ae0b0 RK |
7482 | then |
7483 | declare | |
7484 | Desig_1 : Entity_Id; | |
7485 | Desig_2 : Entity_Id; | |
7486 | ||
7487 | begin | |
885c4871 | 7488 | -- In Ada 2005, access constant indicators must match for |
5d37ba92 | 7489 | -- subtype conformance. |
9dcb52e1 | 7490 | |
0791fbe9 | 7491 | if Ada_Version >= Ada_2005 |
5d37ba92 ES |
7492 | and then Ctype >= Subtype_Conformant |
7493 | and then | |
7494 | Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) | |
7495 | then | |
7496 | return False; | |
996ae0b0 RK |
7497 | end if; |
7498 | ||
5d37ba92 | 7499 | Desig_1 := Find_Designated_Type (Type_1); |
5d37ba92 | 7500 | Desig_2 := Find_Designated_Type (Type_2); |
996ae0b0 | 7501 | |
5d37ba92 | 7502 | -- If the context is an instance association for a formal |
82c80734 RD |
7503 | -- access-to-subprogram type; formal access parameter designated |
7504 | -- types require mapping because they may denote other formal | |
7505 | -- parameters of the generic unit. | |
996ae0b0 RK |
7506 | |
7507 | if Get_Inst then | |
7508 | Desig_1 := Get_Instance_Of (Desig_1); | |
7509 | Desig_2 := Get_Instance_Of (Desig_2); | |
7510 | end if; | |
7511 | ||
82c80734 RD |
7512 | -- It is possible for a Class_Wide_Type to be introduced for an |
7513 | -- incomplete type, in which case there is a separate class_ wide | |
7514 | -- type for the full view. The types conform if their Etypes | |
7515 | -- conform, i.e. one may be the full view of the other. This can | |
7516 | -- only happen in the context of an access parameter, other uses | |
7517 | -- of an incomplete Class_Wide_Type are illegal. | |
996ae0b0 | 7518 | |
fbf5a39b | 7519 | if Is_Class_Wide_Type (Desig_1) |
4adf3c50 AC |
7520 | and then |
7521 | Is_Class_Wide_Type (Desig_2) | |
996ae0b0 RK |
7522 | then |
7523 | return | |
fbf5a39b AC |
7524 | Conforming_Types |
7525 | (Etype (Base_Type (Desig_1)), | |
7526 | Etype (Base_Type (Desig_2)), Ctype); | |
af4b9434 AC |
7527 | |
7528 | elsif Are_Anonymous_Access_To_Subprogram_Types then | |
0791fbe9 | 7529 | if Ada_Version < Ada_2005 then |
758c442c GD |
7530 | return Ctype = Type_Conformant |
7531 | or else | |
af4b9434 AC |
7532 | Subtypes_Statically_Match (Desig_1, Desig_2); |
7533 | ||
758c442c GD |
7534 | -- We must check the conformance of the signatures themselves |
7535 | ||
7536 | else | |
7537 | declare | |
7538 | Conformant : Boolean; | |
7539 | begin | |
7540 | Check_Conformance | |
7541 | (Desig_1, Desig_2, Ctype, False, Conformant); | |
7542 | return Conformant; | |
7543 | end; | |
7544 | end if; | |
7545 | ||
996ae0b0 RK |
7546 | else |
7547 | return Base_Type (Desig_1) = Base_Type (Desig_2) | |
7548 | and then (Ctype = Type_Conformant | |
af4b9434 AC |
7549 | or else |
7550 | Subtypes_Statically_Match (Desig_1, Desig_2)); | |
996ae0b0 RK |
7551 | end if; |
7552 | end; | |
7553 | ||
7554 | -- Otherwise definitely no match | |
7555 | ||
7556 | else | |
c8ef728f ES |
7557 | if ((Ekind (Type_1) = E_Anonymous_Access_Type |
7558 | and then Is_Access_Type (Type_2)) | |
7559 | or else (Ekind (Type_2) = E_Anonymous_Access_Type | |
7560 | and then Is_Access_Type (Type_1))) | |
7561 | and then | |
7562 | Conforming_Types | |
7563 | (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) | |
7564 | then | |
7565 | May_Hide_Profile := True; | |
7566 | end if; | |
7567 | ||
996ae0b0 RK |
7568 | return False; |
7569 | end if; | |
996ae0b0 RK |
7570 | end Conforming_Types; |
7571 | ||
7572 | -------------------------- | |
7573 | -- Create_Extra_Formals -- | |
7574 | -------------------------- | |
7575 | ||
7576 | procedure Create_Extra_Formals (E : Entity_Id) is | |
7577 | Formal : Entity_Id; | |
ec4867fa | 7578 | First_Extra : Entity_Id := Empty; |
996ae0b0 RK |
7579 | Last_Extra : Entity_Id; |
7580 | Formal_Type : Entity_Id; | |
7581 | P_Formal : Entity_Id := Empty; | |
7582 | ||
ec4867fa ES |
7583 | function Add_Extra_Formal |
7584 | (Assoc_Entity : Entity_Id; | |
7585 | Typ : Entity_Id; | |
7586 | Scope : Entity_Id; | |
7587 | Suffix : String) return Entity_Id; | |
7588 | -- Add an extra formal to the current list of formals and extra formals. | |
7589 | -- The extra formal is added to the end of the list of extra formals, | |
7590 | -- and also returned as the result. These formals are always of mode IN. | |
7591 | -- The new formal has the type Typ, is declared in Scope, and its name | |
7592 | -- is given by a concatenation of the name of Assoc_Entity and Suffix. | |
cd5a9750 AC |
7593 | -- The following suffixes are currently used. They should not be changed |
7594 | -- without coordinating with CodePeer, which makes use of these to | |
7595 | -- provide better messages. | |
7596 | ||
d92eccc3 AC |
7597 | -- O denotes the Constrained bit. |
7598 | -- L denotes the accessibility level. | |
cd5a9750 AC |
7599 | -- BIP_xxx denotes an extra formal for a build-in-place function. See |
7600 | -- the full list in exp_ch6.BIP_Formal_Kind. | |
996ae0b0 | 7601 | |
fbf5a39b AC |
7602 | ---------------------- |
7603 | -- Add_Extra_Formal -- | |
7604 | ---------------------- | |
7605 | ||
ec4867fa ES |
7606 | function Add_Extra_Formal |
7607 | (Assoc_Entity : Entity_Id; | |
7608 | Typ : Entity_Id; | |
7609 | Scope : Entity_Id; | |
7610 | Suffix : String) return Entity_Id | |
7611 | is | |
996ae0b0 | 7612 | EF : constant Entity_Id := |
ec4867fa ES |
7613 | Make_Defining_Identifier (Sloc (Assoc_Entity), |
7614 | Chars => New_External_Name (Chars (Assoc_Entity), | |
f937473f | 7615 | Suffix => Suffix)); |
996ae0b0 RK |
7616 | |
7617 | begin | |
82c80734 RD |
7618 | -- A little optimization. Never generate an extra formal for the |
7619 | -- _init operand of an initialization procedure, since it could | |
7620 | -- never be used. | |
996ae0b0 RK |
7621 | |
7622 | if Chars (Formal) = Name_uInit then | |
7623 | return Empty; | |
7624 | end if; | |
7625 | ||
7626 | Set_Ekind (EF, E_In_Parameter); | |
7627 | Set_Actual_Subtype (EF, Typ); | |
7628 | Set_Etype (EF, Typ); | |
ec4867fa | 7629 | Set_Scope (EF, Scope); |
996ae0b0 RK |
7630 | Set_Mechanism (EF, Default_Mechanism); |
7631 | Set_Formal_Validity (EF); | |
7632 | ||
ec4867fa ES |
7633 | if No (First_Extra) then |
7634 | First_Extra := EF; | |
7635 | Set_Extra_Formals (Scope, First_Extra); | |
7636 | end if; | |
7637 | ||
7638 | if Present (Last_Extra) then | |
7639 | Set_Extra_Formal (Last_Extra, EF); | |
7640 | end if; | |
7641 | ||
996ae0b0 | 7642 | Last_Extra := EF; |
ec4867fa | 7643 | |
996ae0b0 RK |
7644 | return EF; |
7645 | end Add_Extra_Formal; | |
7646 | ||
7647 | -- Start of processing for Create_Extra_Formals | |
7648 | ||
7649 | begin | |
f937473f RD |
7650 | -- We never generate extra formals if expansion is not active |
7651 | -- because we don't need them unless we are generating code. | |
7652 | ||
7653 | if not Expander_Active then | |
7654 | return; | |
7655 | end if; | |
7656 | ||
82c80734 | 7657 | -- If this is a derived subprogram then the subtypes of the parent |
16b05213 | 7658 | -- subprogram's formal parameters will be used to determine the need |
82c80734 | 7659 | -- for extra formals. |
996ae0b0 RK |
7660 | |
7661 | if Is_Overloadable (E) and then Present (Alias (E)) then | |
7662 | P_Formal := First_Formal (Alias (E)); | |
7663 | end if; | |
7664 | ||
7665 | Last_Extra := Empty; | |
7666 | Formal := First_Formal (E); | |
7667 | while Present (Formal) loop | |
7668 | Last_Extra := Formal; | |
7669 | Next_Formal (Formal); | |
7670 | end loop; | |
7671 | ||
f937473f | 7672 | -- If Extra_formals were already created, don't do it again. This |
82c80734 RD |
7673 | -- situation may arise for subprogram types created as part of |
7674 | -- dispatching calls (see Expand_Dispatching_Call) | |
996ae0b0 RK |
7675 | |
7676 | if Present (Last_Extra) and then | |
7677 | Present (Extra_Formal (Last_Extra)) | |
7678 | then | |
7679 | return; | |
7680 | end if; | |
7681 | ||
19590d70 GD |
7682 | -- If the subprogram is a predefined dispatching subprogram then don't |
7683 | -- generate any extra constrained or accessibility level formals. In | |
7684 | -- general we suppress these for internal subprograms (by not calling | |
7685 | -- Freeze_Subprogram and Create_Extra_Formals at all), but internally | |
7686 | -- generated stream attributes do get passed through because extra | |
7687 | -- build-in-place formals are needed in some cases (limited 'Input). | |
7688 | ||
bac7206d | 7689 | if Is_Predefined_Internal_Operation (E) then |
63585f75 | 7690 | goto Test_For_Func_Result_Extras; |
19590d70 GD |
7691 | end if; |
7692 | ||
996ae0b0 | 7693 | Formal := First_Formal (E); |
996ae0b0 RK |
7694 | while Present (Formal) loop |
7695 | ||
7696 | -- Create extra formal for supporting the attribute 'Constrained. | |
7697 | -- The case of a private type view without discriminants also | |
7698 | -- requires the extra formal if the underlying type has defaulted | |
7699 | -- discriminants. | |
7700 | ||
7701 | if Ekind (Formal) /= E_In_Parameter then | |
7702 | if Present (P_Formal) then | |
7703 | Formal_Type := Etype (P_Formal); | |
7704 | else | |
7705 | Formal_Type := Etype (Formal); | |
7706 | end if; | |
7707 | ||
5d09245e AC |
7708 | -- Do not produce extra formals for Unchecked_Union parameters. |
7709 | -- Jump directly to the end of the loop. | |
7710 | ||
7711 | if Is_Unchecked_Union (Base_Type (Formal_Type)) then | |
7712 | goto Skip_Extra_Formal_Generation; | |
7713 | end if; | |
7714 | ||
996ae0b0 RK |
7715 | if not Has_Discriminants (Formal_Type) |
7716 | and then Ekind (Formal_Type) in Private_Kind | |
7717 | and then Present (Underlying_Type (Formal_Type)) | |
7718 | then | |
7719 | Formal_Type := Underlying_Type (Formal_Type); | |
7720 | end if; | |
7721 | ||
5e5db3b4 GD |
7722 | -- Suppress the extra formal if formal's subtype is constrained or |
7723 | -- indefinite, or we're compiling for Ada 2012 and the underlying | |
7724 | -- type is tagged and limited. In Ada 2012, a limited tagged type | |
7725 | -- can have defaulted discriminants, but 'Constrained is required | |
7726 | -- to return True, so the formal is never needed (see AI05-0214). | |
7727 | -- Note that this ensures consistency of calling sequences for | |
7728 | -- dispatching operations when some types in a class have defaults | |
7729 | -- on discriminants and others do not (and requiring the extra | |
7730 | -- formal would introduce distributed overhead). | |
7731 | ||
996ae0b0 | 7732 | if Has_Discriminants (Formal_Type) |
f937473f RD |
7733 | and then not Is_Constrained (Formal_Type) |
7734 | and then not Is_Indefinite_Subtype (Formal_Type) | |
5e5db3b4 GD |
7735 | and then (Ada_Version < Ada_2012 |
7736 | or else | |
7737 | not (Is_Tagged_Type (Underlying_Type (Formal_Type)) | |
7738 | and then Is_Limited_Type (Formal_Type))) | |
996ae0b0 RK |
7739 | then |
7740 | Set_Extra_Constrained | |
d92eccc3 | 7741 | (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
996ae0b0 RK |
7742 | end if; |
7743 | end if; | |
7744 | ||
0a36105d JM |
7745 | -- Create extra formal for supporting accessibility checking. This |
7746 | -- is done for both anonymous access formals and formals of named | |
7747 | -- access types that are marked as controlling formals. The latter | |
7748 | -- case can occur when Expand_Dispatching_Call creates a subprogram | |
7749 | -- type and substitutes the types of access-to-class-wide actuals | |
7750 | -- for the anonymous access-to-specific-type of controlling formals. | |
5d37ba92 ES |
7751 | -- Base_Type is applied because in cases where there is a null |
7752 | -- exclusion the formal may have an access subtype. | |
996ae0b0 RK |
7753 | |
7754 | -- This is suppressed if we specifically suppress accessibility | |
f937473f | 7755 | -- checks at the package level for either the subprogram, or the |
fbf5a39b AC |
7756 | -- package in which it resides. However, we do not suppress it |
7757 | -- simply if the scope has accessibility checks suppressed, since | |
7758 | -- this could cause trouble when clients are compiled with a | |
7759 | -- different suppression setting. The explicit checks at the | |
7760 | -- package level are safe from this point of view. | |
996ae0b0 | 7761 | |
5d37ba92 | 7762 | if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
0a36105d | 7763 | or else (Is_Controlling_Formal (Formal) |
5d37ba92 | 7764 | and then Is_Access_Type (Base_Type (Etype (Formal))))) |
996ae0b0 | 7765 | and then not |
fbf5a39b | 7766 | (Explicit_Suppress (E, Accessibility_Check) |
996ae0b0 | 7767 | or else |
fbf5a39b | 7768 | Explicit_Suppress (Scope (E), Accessibility_Check)) |
996ae0b0 | 7769 | and then |
c8ef728f | 7770 | (No (P_Formal) |
996ae0b0 RK |
7771 | or else Present (Extra_Accessibility (P_Formal))) |
7772 | then | |
811c6a85 | 7773 | Set_Extra_Accessibility |
d92eccc3 | 7774 | (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
996ae0b0 RK |
7775 | end if; |
7776 | ||
5d09245e AC |
7777 | -- This label is required when skipping extra formal generation for |
7778 | -- Unchecked_Union parameters. | |
7779 | ||
7780 | <<Skip_Extra_Formal_Generation>> | |
7781 | ||
f937473f RD |
7782 | if Present (P_Formal) then |
7783 | Next_Formal (P_Formal); | |
7784 | end if; | |
7785 | ||
996ae0b0 RK |
7786 | Next_Formal (Formal); |
7787 | end loop; | |
ec4867fa | 7788 | |
63585f75 SB |
7789 | <<Test_For_Func_Result_Extras>> |
7790 | ||
7791 | -- Ada 2012 (AI05-234): "the accessibility level of the result of a | |
7792 | -- function call is ... determined by the point of call ...". | |
7793 | ||
7794 | if Needs_Result_Accessibility_Level (E) then | |
7795 | Set_Extra_Accessibility_Of_Result | |
7796 | (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); | |
7797 | end if; | |
19590d70 | 7798 | |
ec4867fa | 7799 | -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
f937473f RD |
7800 | -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
7801 | ||
0791fbe9 | 7802 | if Ada_Version >= Ada_2005 and then Is_Build_In_Place_Function (E) then |
ec4867fa | 7803 | declare |
f937473f | 7804 | Result_Subt : constant Entity_Id := Etype (E); |
1a36a0cd | 7805 | Full_Subt : constant Entity_Id := Available_View (Result_Subt); |
2fcc44fa | 7806 | Formal_Typ : Entity_Id; |
f937473f | 7807 | |
2fcc44fa | 7808 | Discard : Entity_Id; |
f937473f | 7809 | pragma Warnings (Off, Discard); |
ec4867fa ES |
7810 | |
7811 | begin | |
f937473f | 7812 | -- In the case of functions with unconstrained result subtypes, |
9a1bc6d5 AC |
7813 | -- add a 4-state formal indicating whether the return object is |
7814 | -- allocated by the caller (1), or should be allocated by the | |
7815 | -- callee on the secondary stack (2), in the global heap (3), or | |
7816 | -- in a user-defined storage pool (4). For the moment we just use | |
7817 | -- Natural for the type of this formal. Note that this formal | |
7818 | -- isn't usually needed in the case where the result subtype is | |
7819 | -- constrained, but it is needed when the function has a tagged | |
7820 | -- result, because generally such functions can be called in a | |
7821 | -- dispatching context and such calls must be handled like calls | |
7822 | -- to a class-wide function. | |
0a36105d | 7823 | |
1bb6e262 | 7824 | if Needs_BIP_Alloc_Form (E) then |
f937473f RD |
7825 | Discard := |
7826 | Add_Extra_Formal | |
7827 | (E, Standard_Natural, | |
7828 | E, BIP_Formal_Suffix (BIP_Alloc_Form)); | |
200b7162 | 7829 | |
8417f4b2 | 7830 | -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
3e452820 AC |
7831 | -- use a user-defined pool. This formal is not added on |
7832 | -- .NET/JVM/ZFP as those targets do not support pools. | |
200b7162 | 7833 | |
ea10ca9c AC |
7834 | if VM_Target = No_VM |
7835 | and then RTE_Available (RE_Root_Storage_Pool_Ptr) | |
3e452820 | 7836 | then |
8417f4b2 AC |
7837 | Discard := |
7838 | Add_Extra_Formal | |
7839 | (E, RTE (RE_Root_Storage_Pool_Ptr), | |
7840 | E, BIP_Formal_Suffix (BIP_Storage_Pool)); | |
7841 | end if; | |
f937473f | 7842 | end if; |
ec4867fa | 7843 | |
df3e68b1 | 7844 | -- In the case of functions whose result type needs finalization, |
ca5af305 | 7845 | -- add an extra formal which represents the finalization master. |
df3e68b1 | 7846 | |
ca5af305 | 7847 | if Needs_BIP_Finalization_Master (E) then |
f937473f RD |
7848 | Discard := |
7849 | Add_Extra_Formal | |
ca5af305 AC |
7850 | (E, RTE (RE_Finalization_Master_Ptr), |
7851 | E, BIP_Formal_Suffix (BIP_Finalization_Master)); | |
f937473f RD |
7852 | end if; |
7853 | ||
94bbf008 AC |
7854 | -- When the result type contains tasks, add two extra formals: the |
7855 | -- master of the tasks to be created, and the caller's activation | |
7856 | -- chain. | |
f937473f | 7857 | |
1a36a0cd | 7858 | if Has_Task (Full_Subt) then |
f937473f RD |
7859 | Discard := |
7860 | Add_Extra_Formal | |
7861 | (E, RTE (RE_Master_Id), | |
af89615f | 7862 | E, BIP_Formal_Suffix (BIP_Task_Master)); |
f937473f RD |
7863 | Discard := |
7864 | Add_Extra_Formal | |
7865 | (E, RTE (RE_Activation_Chain_Access), | |
7866 | E, BIP_Formal_Suffix (BIP_Activation_Chain)); | |
7867 | end if; | |
ec4867fa | 7868 | |
f937473f RD |
7869 | -- All build-in-place functions get an extra formal that will be |
7870 | -- passed the address of the return object within the caller. | |
ec4867fa | 7871 | |
1a36a0cd AC |
7872 | Formal_Typ := |
7873 | Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); | |
ec4867fa | 7874 | |
1a36a0cd AC |
7875 | Set_Directly_Designated_Type (Formal_Typ, Result_Subt); |
7876 | Set_Etype (Formal_Typ, Formal_Typ); | |
7877 | Set_Depends_On_Private | |
7878 | (Formal_Typ, Has_Private_Component (Formal_Typ)); | |
7879 | Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); | |
7880 | Set_Is_Access_Constant (Formal_Typ, False); | |
ec4867fa | 7881 | |
1a36a0cd AC |
7882 | -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
7883 | -- the designated type comes from the limited view (for back-end | |
7884 | -- purposes). | |
ec4867fa | 7885 | |
1a36a0cd | 7886 | Set_From_With_Type (Formal_Typ, From_With_Type (Result_Subt)); |
f937473f | 7887 | |
1a36a0cd AC |
7888 | Layout_Type (Formal_Typ); |
7889 | ||
7890 | Discard := | |
7891 | Add_Extra_Formal | |
7892 | (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); | |
ec4867fa ES |
7893 | end; |
7894 | end if; | |
996ae0b0 RK |
7895 | end Create_Extra_Formals; |
7896 | ||
7897 | ----------------------------- | |
7898 | -- Enter_Overloaded_Entity -- | |
7899 | ----------------------------- | |
7900 | ||
7901 | procedure Enter_Overloaded_Entity (S : Entity_Id) is | |
7902 | E : Entity_Id := Current_Entity_In_Scope (S); | |
7903 | C_E : Entity_Id := Current_Entity (S); | |
7904 | ||
7905 | begin | |
7906 | if Present (E) then | |
7907 | Set_Has_Homonym (E); | |
7908 | Set_Has_Homonym (S); | |
7909 | end if; | |
7910 | ||
7911 | Set_Is_Immediately_Visible (S); | |
7912 | Set_Scope (S, Current_Scope); | |
7913 | ||
7914 | -- Chain new entity if front of homonym in current scope, so that | |
7915 | -- homonyms are contiguous. | |
7916 | ||
7917 | if Present (E) | |
7918 | and then E /= C_E | |
7919 | then | |
7920 | while Homonym (C_E) /= E loop | |
7921 | C_E := Homonym (C_E); | |
7922 | end loop; | |
7923 | ||
7924 | Set_Homonym (C_E, S); | |
7925 | ||
7926 | else | |
7927 | E := C_E; | |
7928 | Set_Current_Entity (S); | |
7929 | end if; | |
7930 | ||
7931 | Set_Homonym (S, E); | |
7932 | ||
7933 | Append_Entity (S, Current_Scope); | |
7934 | Set_Public_Status (S); | |
7935 | ||
7936 | if Debug_Flag_E then | |
7937 | Write_Str ("New overloaded entity chain: "); | |
7938 | Write_Name (Chars (S)); | |
996ae0b0 | 7939 | |
82c80734 | 7940 | E := S; |
996ae0b0 RK |
7941 | while Present (E) loop |
7942 | Write_Str (" "); Write_Int (Int (E)); | |
7943 | E := Homonym (E); | |
7944 | end loop; | |
7945 | ||
7946 | Write_Eol; | |
7947 | end if; | |
7948 | ||
7949 | -- Generate warning for hiding | |
7950 | ||
7951 | if Warn_On_Hiding | |
7952 | and then Comes_From_Source (S) | |
7953 | and then In_Extended_Main_Source_Unit (S) | |
7954 | then | |
7955 | E := S; | |
7956 | loop | |
7957 | E := Homonym (E); | |
7958 | exit when No (E); | |
7959 | ||
7fc53871 AC |
7960 | -- Warn unless genuine overloading. Do not emit warning on |
7961 | -- hiding predefined operators in Standard (these are either an | |
7962 | -- (artifact of our implicit declarations, or simple noise) but | |
7963 | -- keep warning on a operator defined on a local subtype, because | |
7964 | -- of the real danger that different operators may be applied in | |
7965 | -- various parts of the program. | |
996ae0b0 | 7966 | |
1f250383 AC |
7967 | -- Note that if E and S have the same scope, there is never any |
7968 | -- hiding. Either the two conflict, and the program is illegal, | |
7969 | -- or S is overriding an implicit inherited subprogram. | |
7970 | ||
7971 | if Scope (E) /= Scope (S) | |
7972 | and then (not Is_Overloadable (E) | |
8d606a78 | 7973 | or else Subtype_Conformant (E, S)) |
f937473f RD |
7974 | and then (Is_Immediately_Visible (E) |
7975 | or else | |
7976 | Is_Potentially_Use_Visible (S)) | |
996ae0b0 | 7977 | then |
7fc53871 AC |
7978 | if Scope (E) /= Standard_Standard then |
7979 | Error_Msg_Sloc := Sloc (E); | |
7980 | Error_Msg_N ("declaration of & hides one#?", S); | |
7981 | ||
7982 | elsif Nkind (S) = N_Defining_Operator_Symbol | |
7983 | and then | |
1f250383 | 7984 | Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S) |
7fc53871 AC |
7985 | then |
7986 | Error_Msg_N | |
7987 | ("declaration of & hides predefined operator?", S); | |
7988 | end if; | |
996ae0b0 RK |
7989 | end if; |
7990 | end loop; | |
7991 | end if; | |
7992 | end Enter_Overloaded_Entity; | |
7993 | ||
e5a58fac AC |
7994 | ----------------------------- |
7995 | -- Check_Untagged_Equality -- | |
7996 | ----------------------------- | |
7997 | ||
7998 | procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is | |
7999 | Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); | |
8000 | Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); | |
8001 | Obj_Decl : Node_Id; | |
8002 | ||
8003 | begin | |
8004 | if Nkind (Decl) = N_Subprogram_Declaration | |
8005 | and then Is_Record_Type (Typ) | |
8006 | and then not Is_Tagged_Type (Typ) | |
8007 | then | |
21a5b575 AC |
8008 | -- If the type is not declared in a package, or if we are in the |
8009 | -- body of the package or in some other scope, the new operation is | |
8010 | -- not primitive, and therefore legal, though suspicious. If the | |
8011 | -- type is a generic actual (sub)type, the operation is not primitive | |
8012 | -- either because the base type is declared elsewhere. | |
8013 | ||
e5a58fac | 8014 | if Is_Frozen (Typ) then |
21a5b575 AC |
8015 | if Ekind (Scope (Typ)) /= E_Package |
8016 | or else Scope (Typ) /= Current_Scope | |
8017 | then | |
8018 | null; | |
e5a58fac | 8019 | |
21a5b575 AC |
8020 | elsif Is_Generic_Actual_Type (Typ) then |
8021 | null; | |
e5a58fac | 8022 | |
21a5b575 | 8023 | elsif In_Package_Body (Scope (Typ)) then |
ae6ede77 AC |
8024 | Error_Msg_NE |
8025 | ("equality operator must be declared " | |
8026 | & "before type& is frozen", Eq_Op, Typ); | |
8027 | Error_Msg_N | |
8028 | ("\move declaration to package spec", Eq_Op); | |
21a5b575 AC |
8029 | |
8030 | else | |
8031 | Error_Msg_NE | |
8032 | ("equality operator must be declared " | |
8033 | & "before type& is frozen", Eq_Op, Typ); | |
8034 | ||
8035 | Obj_Decl := Next (Parent (Typ)); | |
8036 | while Present (Obj_Decl) | |
8037 | and then Obj_Decl /= Decl | |
8038 | loop | |
8039 | if Nkind (Obj_Decl) = N_Object_Declaration | |
8040 | and then Etype (Defining_Identifier (Obj_Decl)) = Typ | |
8041 | then | |
8042 | Error_Msg_NE ("type& is frozen by declaration?", | |
8043 | Obj_Decl, Typ); | |
8044 | Error_Msg_N | |
8045 | ("\an equality operator cannot be declared after this " | |
a4640a39 | 8046 | & "point (RM 4.5.2 (9.8)) (Ada 2012))?", Obj_Decl); |
21a5b575 AC |
8047 | exit; |
8048 | end if; | |
8049 | ||
8050 | Next (Obj_Decl); | |
8051 | end loop; | |
8052 | end if; | |
e5a58fac AC |
8053 | |
8054 | elsif not In_Same_List (Parent (Typ), Decl) | |
8055 | and then not Is_Limited_Type (Typ) | |
8056 | then | |
21a5b575 AC |
8057 | |
8058 | -- This makes it illegal to have a primitive equality declared in | |
8059 | -- the private part if the type is visible. | |
8060 | ||
e5a58fac AC |
8061 | Error_Msg_N ("equality operator appears too late", Eq_Op); |
8062 | end if; | |
8063 | end if; | |
8064 | end Check_Untagged_Equality; | |
8065 | ||
996ae0b0 RK |
8066 | ----------------------------- |
8067 | -- Find_Corresponding_Spec -- | |
8068 | ----------------------------- | |
8069 | ||
d44202ba HK |
8070 | function Find_Corresponding_Spec |
8071 | (N : Node_Id; | |
8072 | Post_Error : Boolean := True) return Entity_Id | |
8073 | is | |
996ae0b0 RK |
8074 | Spec : constant Node_Id := Specification (N); |
8075 | Designator : constant Entity_Id := Defining_Entity (Spec); | |
8076 | ||
8077 | E : Entity_Id; | |
8078 | ||
8079 | begin | |
8080 | E := Current_Entity (Designator); | |
996ae0b0 RK |
8081 | while Present (E) loop |
8082 | ||
8083 | -- We are looking for a matching spec. It must have the same scope, | |
8084 | -- and the same name, and either be type conformant, or be the case | |
8085 | -- of a library procedure spec and its body (which belong to one | |
8086 | -- another regardless of whether they are type conformant or not). | |
8087 | ||
8088 | if Scope (E) = Current_Scope then | |
fbf5a39b AC |
8089 | if Current_Scope = Standard_Standard |
8090 | or else (Ekind (E) = Ekind (Designator) | |
8091 | and then Type_Conformant (E, Designator)) | |
996ae0b0 RK |
8092 | then |
8093 | -- Within an instantiation, we know that spec and body are | |
8094 | -- subtype conformant, because they were subtype conformant | |
8095 | -- in the generic. We choose the subtype-conformant entity | |
8096 | -- here as well, to resolve spurious ambiguities in the | |
8097 | -- instance that were not present in the generic (i.e. when | |
8098 | -- two different types are given the same actual). If we are | |
8099 | -- looking for a spec to match a body, full conformance is | |
8100 | -- expected. | |
8101 | ||
8102 | if In_Instance then | |
8103 | Set_Convention (Designator, Convention (E)); | |
8104 | ||
0187b60e AC |
8105 | -- Skip past subprogram bodies and subprogram renamings that |
8106 | -- may appear to have a matching spec, but that aren't fully | |
8107 | -- conformant with it. That can occur in cases where an | |
8108 | -- actual type causes unrelated homographs in the instance. | |
8109 | ||
8110 | if Nkind_In (N, N_Subprogram_Body, | |
8111 | N_Subprogram_Renaming_Declaration) | |
996ae0b0 | 8112 | and then Present (Homonym (E)) |
c7b9d548 | 8113 | and then not Fully_Conformant (Designator, E) |
996ae0b0 RK |
8114 | then |
8115 | goto Next_Entity; | |
8116 | ||
c7b9d548 | 8117 | elsif not Subtype_Conformant (Designator, E) then |
996ae0b0 RK |
8118 | goto Next_Entity; |
8119 | end if; | |
8120 | end if; | |
8121 | ||
25ebc085 AC |
8122 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
8123 | -- null procedures locate the internally generated spec. We | |
8124 | -- enforce mode conformance since a tagged type may inherit | |
8125 | -- from interfaces several null primitives which differ only | |
8126 | -- in the mode of the formals. | |
8127 | ||
8128 | if not (Comes_From_Source (E)) | |
8129 | and then Is_Null_Procedure (E) | |
8130 | and then not Mode_Conformant (Designator, E) | |
8131 | then | |
8132 | null; | |
8133 | ||
8134 | elsif not Has_Completion (E) then | |
996ae0b0 RK |
8135 | if Nkind (N) /= N_Subprogram_Body_Stub then |
8136 | Set_Corresponding_Spec (N, E); | |
8137 | end if; | |
8138 | ||
8139 | Set_Has_Completion (E); | |
8140 | return E; | |
8141 | ||
8142 | elsif Nkind (Parent (N)) = N_Subunit then | |
8143 | ||
8144 | -- If this is the proper body of a subunit, the completion | |
8145 | -- flag is set when analyzing the stub. | |
8146 | ||
8147 | return E; | |
8148 | ||
81db9d77 ES |
8149 | -- If E is an internal function with a controlling result |
8150 | -- that was created for an operation inherited by a null | |
8151 | -- extension, it may be overridden by a body without a previous | |
8152 | -- spec (one more reason why these should be shunned). In that | |
1366997b AC |
8153 | -- case remove the generated body if present, because the |
8154 | -- current one is the explicit overriding. | |
81db9d77 ES |
8155 | |
8156 | elsif Ekind (E) = E_Function | |
0791fbe9 | 8157 | and then Ada_Version >= Ada_2005 |
81db9d77 ES |
8158 | and then not Comes_From_Source (E) |
8159 | and then Has_Controlling_Result (E) | |
8160 | and then Is_Null_Extension (Etype (E)) | |
8161 | and then Comes_From_Source (Spec) | |
8162 | then | |
8163 | Set_Has_Completion (E, False); | |
8164 | ||
1366997b AC |
8165 | if Expander_Active |
8166 | and then Nkind (Parent (E)) = N_Function_Specification | |
8167 | then | |
81db9d77 ES |
8168 | Remove |
8169 | (Unit_Declaration_Node | |
1366997b AC |
8170 | (Corresponding_Body (Unit_Declaration_Node (E)))); |
8171 | ||
81db9d77 ES |
8172 | return E; |
8173 | ||
1366997b AC |
8174 | -- If expansion is disabled, or if the wrapper function has |
8175 | -- not been generated yet, this a late body overriding an | |
8176 | -- inherited operation, or it is an overriding by some other | |
8177 | -- declaration before the controlling result is frozen. In | |
8178 | -- either case this is a declaration of a new entity. | |
81db9d77 ES |
8179 | |
8180 | else | |
8181 | return Empty; | |
8182 | end if; | |
8183 | ||
d44202ba HK |
8184 | -- If the body already exists, then this is an error unless |
8185 | -- the previous declaration is the implicit declaration of a | |
756ef2a0 AC |
8186 | -- derived subprogram. It is also legal for an instance to |
8187 | -- contain type conformant overloadable declarations (but the | |
8188 | -- generic declaration may not), per 8.3(26/2). | |
996ae0b0 RK |
8189 | |
8190 | elsif No (Alias (E)) | |
8191 | and then not Is_Intrinsic_Subprogram (E) | |
8192 | and then not In_Instance | |
d44202ba | 8193 | and then Post_Error |
996ae0b0 RK |
8194 | then |
8195 | Error_Msg_Sloc := Sloc (E); | |
8dbd1460 | 8196 | |
07fc65c4 GB |
8197 | if Is_Imported (E) then |
8198 | Error_Msg_NE | |
8199 | ("body not allowed for imported subprogram & declared#", | |
8200 | N, E); | |
8201 | else | |
8202 | Error_Msg_NE ("duplicate body for & declared#", N, E); | |
8203 | end if; | |
996ae0b0 RK |
8204 | end if; |
8205 | ||
d44202ba HK |
8206 | -- Child units cannot be overloaded, so a conformance mismatch |
8207 | -- between body and a previous spec is an error. | |
8208 | ||
996ae0b0 RK |
8209 | elsif Is_Child_Unit (E) |
8210 | and then | |
8211 | Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body | |
8212 | and then | |
5d37ba92 | 8213 | Nkind (Parent (Unit_Declaration_Node (Designator))) = |
d44202ba HK |
8214 | N_Compilation_Unit |
8215 | and then Post_Error | |
996ae0b0 | 8216 | then |
996ae0b0 RK |
8217 | Error_Msg_N |
8218 | ("body of child unit does not match previous declaration", N); | |
8219 | end if; | |
8220 | end if; | |
8221 | ||
8222 | <<Next_Entity>> | |
8223 | E := Homonym (E); | |
8224 | end loop; | |
8225 | ||
8226 | -- On exit, we know that no previous declaration of subprogram exists | |
8227 | ||
8228 | return Empty; | |
8229 | end Find_Corresponding_Spec; | |
8230 | ||
8231 | ---------------------- | |
8232 | -- Fully_Conformant -- | |
8233 | ---------------------- | |
8234 | ||
8235 | function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
8236 | Result : Boolean; | |
996ae0b0 RK |
8237 | begin |
8238 | Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); | |
8239 | return Result; | |
8240 | end Fully_Conformant; | |
8241 | ||
8242 | ---------------------------------- | |
8243 | -- Fully_Conformant_Expressions -- | |
8244 | ---------------------------------- | |
8245 | ||
8246 | function Fully_Conformant_Expressions | |
8247 | (Given_E1 : Node_Id; | |
d05ef0ab | 8248 | Given_E2 : Node_Id) return Boolean |
996ae0b0 RK |
8249 | is |
8250 | E1 : constant Node_Id := Original_Node (Given_E1); | |
8251 | E2 : constant Node_Id := Original_Node (Given_E2); | |
8252 | -- We always test conformance on original nodes, since it is possible | |
8253 | -- for analysis and/or expansion to make things look as though they | |
8254 | -- conform when they do not, e.g. by converting 1+2 into 3. | |
8255 | ||
8256 | function FCE (Given_E1, Given_E2 : Node_Id) return Boolean | |
8257 | renames Fully_Conformant_Expressions; | |
8258 | ||
8259 | function FCL (L1, L2 : List_Id) return Boolean; | |
8260 | -- Compare elements of two lists for conformance. Elements have to | |
8261 | -- be conformant, and actuals inserted as default parameters do not | |
8262 | -- match explicit actuals with the same value. | |
8263 | ||
8264 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean; | |
e895b435 | 8265 | -- Compare an operator node with a function call |
996ae0b0 RK |
8266 | |
8267 | --------- | |
8268 | -- FCL -- | |
8269 | --------- | |
8270 | ||
8271 | function FCL (L1, L2 : List_Id) return Boolean is | |
8272 | N1, N2 : Node_Id; | |
8273 | ||
8274 | begin | |
8275 | if L1 = No_List then | |
8276 | N1 := Empty; | |
8277 | else | |
8278 | N1 := First (L1); | |
8279 | end if; | |
8280 | ||
8281 | if L2 = No_List then | |
8282 | N2 := Empty; | |
8283 | else | |
8284 | N2 := First (L2); | |
8285 | end if; | |
8286 | ||
8287 | -- Compare two lists, skipping rewrite insertions (we want to | |
8288 | -- compare the original trees, not the expanded versions!) | |
8289 | ||
8290 | loop | |
8291 | if Is_Rewrite_Insertion (N1) then | |
8292 | Next (N1); | |
8293 | elsif Is_Rewrite_Insertion (N2) then | |
8294 | Next (N2); | |
8295 | elsif No (N1) then | |
8296 | return No (N2); | |
8297 | elsif No (N2) then | |
8298 | return False; | |
8299 | elsif not FCE (N1, N2) then | |
8300 | return False; | |
8301 | else | |
8302 | Next (N1); | |
8303 | Next (N2); | |
8304 | end if; | |
8305 | end loop; | |
8306 | end FCL; | |
8307 | ||
8308 | --------- | |
8309 | -- FCO -- | |
8310 | --------- | |
8311 | ||
8312 | function FCO (Op_Node, Call_Node : Node_Id) return Boolean is | |
8313 | Actuals : constant List_Id := Parameter_Associations (Call_Node); | |
8314 | Act : Node_Id; | |
8315 | ||
8316 | begin | |
8317 | if No (Actuals) | |
8318 | or else Entity (Op_Node) /= Entity (Name (Call_Node)) | |
8319 | then | |
8320 | return False; | |
8321 | ||
8322 | else | |
8323 | Act := First (Actuals); | |
8324 | ||
8325 | if Nkind (Op_Node) in N_Binary_Op then | |
996ae0b0 RK |
8326 | if not FCE (Left_Opnd (Op_Node), Act) then |
8327 | return False; | |
8328 | end if; | |
8329 | ||
8330 | Next (Act); | |
8331 | end if; | |
8332 | ||
8333 | return Present (Act) | |
8334 | and then FCE (Right_Opnd (Op_Node), Act) | |
8335 | and then No (Next (Act)); | |
8336 | end if; | |
8337 | end FCO; | |
8338 | ||
8339 | -- Start of processing for Fully_Conformant_Expressions | |
8340 | ||
8341 | begin | |
8342 | -- Non-conformant if paren count does not match. Note: if some idiot | |
8343 | -- complains that we don't do this right for more than 3 levels of | |
0a36105d | 8344 | -- parentheses, they will be treated with the respect they deserve! |
996ae0b0 RK |
8345 | |
8346 | if Paren_Count (E1) /= Paren_Count (E2) then | |
8347 | return False; | |
8348 | ||
82c80734 RD |
8349 | -- If same entities are referenced, then they are conformant even if |
8350 | -- they have different forms (RM 8.3.1(19-20)). | |
996ae0b0 RK |
8351 | |
8352 | elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then | |
8353 | if Present (Entity (E1)) then | |
8354 | return Entity (E1) = Entity (E2) | |
8355 | or else (Chars (Entity (E1)) = Chars (Entity (E2)) | |
8356 | and then Ekind (Entity (E1)) = E_Discriminant | |
8357 | and then Ekind (Entity (E2)) = E_In_Parameter); | |
8358 | ||
8359 | elsif Nkind (E1) = N_Expanded_Name | |
8360 | and then Nkind (E2) = N_Expanded_Name | |
8361 | and then Nkind (Selector_Name (E1)) = N_Character_Literal | |
8362 | and then Nkind (Selector_Name (E2)) = N_Character_Literal | |
8363 | then | |
8364 | return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); | |
8365 | ||
8366 | else | |
8367 | -- Identifiers in component associations don't always have | |
8368 | -- entities, but their names must conform. | |
8369 | ||
8370 | return Nkind (E1) = N_Identifier | |
8371 | and then Nkind (E2) = N_Identifier | |
8372 | and then Chars (E1) = Chars (E2); | |
8373 | end if; | |
8374 | ||
8375 | elsif Nkind (E1) = N_Character_Literal | |
8376 | and then Nkind (E2) = N_Expanded_Name | |
8377 | then | |
8378 | return Nkind (Selector_Name (E2)) = N_Character_Literal | |
8379 | and then Chars (E1) = Chars (Selector_Name (E2)); | |
8380 | ||
8381 | elsif Nkind (E2) = N_Character_Literal | |
8382 | and then Nkind (E1) = N_Expanded_Name | |
8383 | then | |
8384 | return Nkind (Selector_Name (E1)) = N_Character_Literal | |
8385 | and then Chars (E2) = Chars (Selector_Name (E1)); | |
8386 | ||
8387 | elsif Nkind (E1) in N_Op | |
8388 | and then Nkind (E2) = N_Function_Call | |
8389 | then | |
8390 | return FCO (E1, E2); | |
8391 | ||
8392 | elsif Nkind (E2) in N_Op | |
8393 | and then Nkind (E1) = N_Function_Call | |
8394 | then | |
8395 | return FCO (E2, E1); | |
8396 | ||
8397 | -- Otherwise we must have the same syntactic entity | |
8398 | ||
8399 | elsif Nkind (E1) /= Nkind (E2) then | |
8400 | return False; | |
8401 | ||
8402 | -- At this point, we specialize by node type | |
8403 | ||
8404 | else | |
8405 | case Nkind (E1) is | |
8406 | ||
8407 | when N_Aggregate => | |
8408 | return | |
8409 | FCL (Expressions (E1), Expressions (E2)) | |
19d846a0 RD |
8410 | and then |
8411 | FCL (Component_Associations (E1), | |
8412 | Component_Associations (E2)); | |
996ae0b0 RK |
8413 | |
8414 | when N_Allocator => | |
8415 | if Nkind (Expression (E1)) = N_Qualified_Expression | |
8416 | or else | |
8417 | Nkind (Expression (E2)) = N_Qualified_Expression | |
8418 | then | |
8419 | return FCE (Expression (E1), Expression (E2)); | |
8420 | ||
8421 | -- Check that the subtype marks and any constraints | |
8422 | -- are conformant | |
8423 | ||
8424 | else | |
8425 | declare | |
8426 | Indic1 : constant Node_Id := Expression (E1); | |
8427 | Indic2 : constant Node_Id := Expression (E2); | |
8428 | Elt1 : Node_Id; | |
8429 | Elt2 : Node_Id; | |
8430 | ||
8431 | begin | |
8432 | if Nkind (Indic1) /= N_Subtype_Indication then | |
8433 | return | |
8434 | Nkind (Indic2) /= N_Subtype_Indication | |
8435 | and then Entity (Indic1) = Entity (Indic2); | |
8436 | ||
8437 | elsif Nkind (Indic2) /= N_Subtype_Indication then | |
8438 | return | |
8439 | Nkind (Indic1) /= N_Subtype_Indication | |
8440 | and then Entity (Indic1) = Entity (Indic2); | |
8441 | ||
8442 | else | |
8443 | if Entity (Subtype_Mark (Indic1)) /= | |
8444 | Entity (Subtype_Mark (Indic2)) | |
8445 | then | |
8446 | return False; | |
8447 | end if; | |
8448 | ||
8449 | Elt1 := First (Constraints (Constraint (Indic1))); | |
8450 | Elt2 := First (Constraints (Constraint (Indic2))); | |
996ae0b0 RK |
8451 | while Present (Elt1) and then Present (Elt2) loop |
8452 | if not FCE (Elt1, Elt2) then | |
8453 | return False; | |
8454 | end if; | |
8455 | ||
8456 | Next (Elt1); | |
8457 | Next (Elt2); | |
8458 | end loop; | |
8459 | ||
8460 | return True; | |
8461 | end if; | |
8462 | end; | |
8463 | end if; | |
8464 | ||
8465 | when N_Attribute_Reference => | |
8466 | return | |
8467 | Attribute_Name (E1) = Attribute_Name (E2) | |
8468 | and then FCL (Expressions (E1), Expressions (E2)); | |
8469 | ||
8470 | when N_Binary_Op => | |
8471 | return | |
8472 | Entity (E1) = Entity (E2) | |
8473 | and then FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
8474 | and then FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
8475 | ||
514d0fc5 | 8476 | when N_Short_Circuit | N_Membership_Test => |
996ae0b0 RK |
8477 | return |
8478 | FCE (Left_Opnd (E1), Left_Opnd (E2)) | |
8479 | and then | |
8480 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
8481 | ||
19d846a0 RD |
8482 | when N_Case_Expression => |
8483 | declare | |
8484 | Alt1 : Node_Id; | |
8485 | Alt2 : Node_Id; | |
8486 | ||
8487 | begin | |
8488 | if not FCE (Expression (E1), Expression (E2)) then | |
8489 | return False; | |
8490 | ||
8491 | else | |
8492 | Alt1 := First (Alternatives (E1)); | |
8493 | Alt2 := First (Alternatives (E2)); | |
8494 | loop | |
8495 | if Present (Alt1) /= Present (Alt2) then | |
8496 | return False; | |
8497 | elsif No (Alt1) then | |
8498 | return True; | |
8499 | end if; | |
8500 | ||
8501 | if not FCE (Expression (Alt1), Expression (Alt2)) | |
8502 | or else not FCL (Discrete_Choices (Alt1), | |
8503 | Discrete_Choices (Alt2)) | |
8504 | then | |
8505 | return False; | |
8506 | end if; | |
8507 | ||
8508 | Next (Alt1); | |
8509 | Next (Alt2); | |
8510 | end loop; | |
8511 | end if; | |
8512 | end; | |
8513 | ||
996ae0b0 RK |
8514 | when N_Character_Literal => |
8515 | return | |
8516 | Char_Literal_Value (E1) = Char_Literal_Value (E2); | |
8517 | ||
8518 | when N_Component_Association => | |
8519 | return | |
8520 | FCL (Choices (E1), Choices (E2)) | |
19d846a0 RD |
8521 | and then |
8522 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
8523 | |
8524 | when N_Conditional_Expression => | |
8525 | return | |
8526 | FCL (Expressions (E1), Expressions (E2)); | |
8527 | ||
8528 | when N_Explicit_Dereference => | |
8529 | return | |
8530 | FCE (Prefix (E1), Prefix (E2)); | |
8531 | ||
8532 | when N_Extension_Aggregate => | |
8533 | return | |
8534 | FCL (Expressions (E1), Expressions (E2)) | |
8535 | and then Null_Record_Present (E1) = | |
8536 | Null_Record_Present (E2) | |
8537 | and then FCL (Component_Associations (E1), | |
8538 | Component_Associations (E2)); | |
8539 | ||
8540 | when N_Function_Call => | |
8541 | return | |
8542 | FCE (Name (E1), Name (E2)) | |
19d846a0 RD |
8543 | and then |
8544 | FCL (Parameter_Associations (E1), | |
8545 | Parameter_Associations (E2)); | |
996ae0b0 RK |
8546 | |
8547 | when N_Indexed_Component => | |
8548 | return | |
8549 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
8550 | and then |
8551 | FCL (Expressions (E1), Expressions (E2)); | |
996ae0b0 RK |
8552 | |
8553 | when N_Integer_Literal => | |
8554 | return (Intval (E1) = Intval (E2)); | |
8555 | ||
8556 | when N_Null => | |
8557 | return True; | |
8558 | ||
8559 | when N_Operator_Symbol => | |
8560 | return | |
8561 | Chars (E1) = Chars (E2); | |
8562 | ||
8563 | when N_Others_Choice => | |
8564 | return True; | |
8565 | ||
8566 | when N_Parameter_Association => | |
8567 | return | |
996ae0b0 RK |
8568 | Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
8569 | and then FCE (Explicit_Actual_Parameter (E1), | |
8570 | Explicit_Actual_Parameter (E2)); | |
8571 | ||
8572 | when N_Qualified_Expression => | |
8573 | return | |
8574 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
8575 | and then |
8576 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 | 8577 | |
2010d078 AC |
8578 | when N_Quantified_Expression => |
8579 | if not FCE (Condition (E1), Condition (E2)) then | |
8580 | return False; | |
8581 | end if; | |
8582 | ||
8583 | if Present (Loop_Parameter_Specification (E1)) | |
8584 | and then Present (Loop_Parameter_Specification (E2)) | |
8585 | then | |
8586 | declare | |
8587 | L1 : constant Node_Id := | |
8588 | Loop_Parameter_Specification (E1); | |
8589 | L2 : constant Node_Id := | |
8590 | Loop_Parameter_Specification (E2); | |
8591 | ||
8592 | begin | |
8593 | return | |
8594 | Reverse_Present (L1) = Reverse_Present (L2) | |
8595 | and then | |
8596 | FCE (Defining_Identifier (L1), | |
8597 | Defining_Identifier (L2)) | |
8598 | and then | |
8599 | FCE (Discrete_Subtype_Definition (L1), | |
8600 | Discrete_Subtype_Definition (L2)); | |
8601 | end; | |
8602 | ||
8603 | else -- quantified expression with an iterator | |
8604 | declare | |
8605 | I1 : constant Node_Id := Iterator_Specification (E1); | |
8606 | I2 : constant Node_Id := Iterator_Specification (E2); | |
8607 | ||
8608 | begin | |
8609 | return | |
8610 | FCE (Defining_Identifier (I1), | |
8611 | Defining_Identifier (I2)) | |
8612 | and then | |
8613 | Of_Present (I1) = Of_Present (I2) | |
8614 | and then | |
8615 | Reverse_Present (I1) = Reverse_Present (I2) | |
8616 | and then FCE (Name (I1), Name (I2)) | |
8617 | and then FCE (Subtype_Indication (I1), | |
8618 | Subtype_Indication (I2)); | |
8619 | end; | |
8620 | end if; | |
8621 | ||
996ae0b0 RK |
8622 | when N_Range => |
8623 | return | |
8624 | FCE (Low_Bound (E1), Low_Bound (E2)) | |
19d846a0 RD |
8625 | and then |
8626 | FCE (High_Bound (E1), High_Bound (E2)); | |
996ae0b0 RK |
8627 | |
8628 | when N_Real_Literal => | |
8629 | return (Realval (E1) = Realval (E2)); | |
8630 | ||
8631 | when N_Selected_Component => | |
8632 | return | |
8633 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
8634 | and then |
8635 | FCE (Selector_Name (E1), Selector_Name (E2)); | |
996ae0b0 RK |
8636 | |
8637 | when N_Slice => | |
8638 | return | |
8639 | FCE (Prefix (E1), Prefix (E2)) | |
19d846a0 RD |
8640 | and then |
8641 | FCE (Discrete_Range (E1), Discrete_Range (E2)); | |
996ae0b0 RK |
8642 | |
8643 | when N_String_Literal => | |
8644 | declare | |
8645 | S1 : constant String_Id := Strval (E1); | |
8646 | S2 : constant String_Id := Strval (E2); | |
8647 | L1 : constant Nat := String_Length (S1); | |
8648 | L2 : constant Nat := String_Length (S2); | |
8649 | ||
8650 | begin | |
8651 | if L1 /= L2 then | |
8652 | return False; | |
8653 | ||
8654 | else | |
8655 | for J in 1 .. L1 loop | |
8656 | if Get_String_Char (S1, J) /= | |
8657 | Get_String_Char (S2, J) | |
8658 | then | |
8659 | return False; | |
8660 | end if; | |
8661 | end loop; | |
8662 | ||
8663 | return True; | |
8664 | end if; | |
8665 | end; | |
8666 | ||
8667 | when N_Type_Conversion => | |
8668 | return | |
8669 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
8670 | and then |
8671 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
8672 | |
8673 | when N_Unary_Op => | |
8674 | return | |
8675 | Entity (E1) = Entity (E2) | |
19d846a0 RD |
8676 | and then |
8677 | FCE (Right_Opnd (E1), Right_Opnd (E2)); | |
996ae0b0 RK |
8678 | |
8679 | when N_Unchecked_Type_Conversion => | |
8680 | return | |
8681 | FCE (Subtype_Mark (E1), Subtype_Mark (E2)) | |
19d846a0 RD |
8682 | and then |
8683 | FCE (Expression (E1), Expression (E2)); | |
996ae0b0 RK |
8684 | |
8685 | -- All other node types cannot appear in this context. Strictly | |
8686 | -- we should raise a fatal internal error. Instead we just ignore | |
8687 | -- the nodes. This means that if anyone makes a mistake in the | |
8688 | -- expander and mucks an expression tree irretrievably, the | |
8689 | -- result will be a failure to detect a (probably very obscure) | |
8690 | -- case of non-conformance, which is better than bombing on some | |
8691 | -- case where two expressions do in fact conform. | |
8692 | ||
8693 | when others => | |
8694 | return True; | |
8695 | ||
8696 | end case; | |
8697 | end if; | |
8698 | end Fully_Conformant_Expressions; | |
8699 | ||
fbf5a39b AC |
8700 | ---------------------------------------- |
8701 | -- Fully_Conformant_Discrete_Subtypes -- | |
8702 | ---------------------------------------- | |
8703 | ||
8704 | function Fully_Conformant_Discrete_Subtypes | |
8705 | (Given_S1 : Node_Id; | |
d05ef0ab | 8706 | Given_S2 : Node_Id) return Boolean |
fbf5a39b AC |
8707 | is |
8708 | S1 : constant Node_Id := Original_Node (Given_S1); | |
8709 | S2 : constant Node_Id := Original_Node (Given_S2); | |
8710 | ||
8711 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; | |
82c80734 RD |
8712 | -- Special-case for a bound given by a discriminant, which in the body |
8713 | -- is replaced with the discriminal of the enclosing type. | |
fbf5a39b AC |
8714 | |
8715 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; | |
e895b435 | 8716 | -- Check both bounds |
fbf5a39b | 8717 | |
5d37ba92 ES |
8718 | ----------------------- |
8719 | -- Conforming_Bounds -- | |
8720 | ----------------------- | |
8721 | ||
fbf5a39b AC |
8722 | function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
8723 | begin | |
8724 | if Is_Entity_Name (B1) | |
8725 | and then Is_Entity_Name (B2) | |
8726 | and then Ekind (Entity (B1)) = E_Discriminant | |
8727 | then | |
8728 | return Chars (B1) = Chars (B2); | |
8729 | ||
8730 | else | |
8731 | return Fully_Conformant_Expressions (B1, B2); | |
8732 | end if; | |
8733 | end Conforming_Bounds; | |
8734 | ||
5d37ba92 ES |
8735 | ----------------------- |
8736 | -- Conforming_Ranges -- | |
8737 | ----------------------- | |
8738 | ||
fbf5a39b AC |
8739 | function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
8740 | begin | |
8741 | return | |
8742 | Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) | |
8743 | and then | |
8744 | Conforming_Bounds (High_Bound (R1), High_Bound (R2)); | |
8745 | end Conforming_Ranges; | |
8746 | ||
8747 | -- Start of processing for Fully_Conformant_Discrete_Subtypes | |
8748 | ||
8749 | begin | |
8750 | if Nkind (S1) /= Nkind (S2) then | |
8751 | return False; | |
8752 | ||
8753 | elsif Is_Entity_Name (S1) then | |
8754 | return Entity (S1) = Entity (S2); | |
8755 | ||
8756 | elsif Nkind (S1) = N_Range then | |
8757 | return Conforming_Ranges (S1, S2); | |
8758 | ||
8759 | elsif Nkind (S1) = N_Subtype_Indication then | |
8760 | return | |
8761 | Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) | |
8762 | and then | |
8763 | Conforming_Ranges | |
8764 | (Range_Expression (Constraint (S1)), | |
8765 | Range_Expression (Constraint (S2))); | |
8766 | else | |
8767 | return True; | |
8768 | end if; | |
8769 | end Fully_Conformant_Discrete_Subtypes; | |
8770 | ||
996ae0b0 RK |
8771 | -------------------- |
8772 | -- Install_Entity -- | |
8773 | -------------------- | |
8774 | ||
8775 | procedure Install_Entity (E : Entity_Id) is | |
8776 | Prev : constant Entity_Id := Current_Entity (E); | |
996ae0b0 RK |
8777 | begin |
8778 | Set_Is_Immediately_Visible (E); | |
8779 | Set_Current_Entity (E); | |
8780 | Set_Homonym (E, Prev); | |
8781 | end Install_Entity; | |
8782 | ||
8783 | --------------------- | |
8784 | -- Install_Formals -- | |
8785 | --------------------- | |
8786 | ||
8787 | procedure Install_Formals (Id : Entity_Id) is | |
8788 | F : Entity_Id; | |
996ae0b0 RK |
8789 | begin |
8790 | F := First_Formal (Id); | |
996ae0b0 RK |
8791 | while Present (F) loop |
8792 | Install_Entity (F); | |
8793 | Next_Formal (F); | |
8794 | end loop; | |
8795 | end Install_Formals; | |
8796 | ||
ce2b6ba5 JM |
8797 | ----------------------------- |
8798 | -- Is_Interface_Conformant -- | |
8799 | ----------------------------- | |
8800 | ||
8801 | function Is_Interface_Conformant | |
8802 | (Tagged_Type : Entity_Id; | |
8803 | Iface_Prim : Entity_Id; | |
8804 | Prim : Entity_Id) return Boolean | |
8805 | is | |
fceeaab6 ES |
8806 | Iface : constant Entity_Id := Find_Dispatching_Type (Iface_Prim); |
8807 | Typ : constant Entity_Id := Find_Dispatching_Type (Prim); | |
8808 | ||
25ebc085 AC |
8809 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
8810 | -- Return the controlling formal of Prim | |
8811 | ||
59e6b23c AC |
8812 | ------------------------ |
8813 | -- Controlling_Formal -- | |
8814 | ------------------------ | |
8815 | ||
25ebc085 AC |
8816 | function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
8817 | E : Entity_Id := First_Entity (Prim); | |
59e6b23c | 8818 | |
25ebc085 AC |
8819 | begin |
8820 | while Present (E) loop | |
8821 | if Is_Formal (E) and then Is_Controlling_Formal (E) then | |
8822 | return E; | |
8823 | end if; | |
8824 | ||
8825 | Next_Entity (E); | |
8826 | end loop; | |
8827 | ||
8828 | return Empty; | |
8829 | end Controlling_Formal; | |
8830 | ||
8831 | -- Local variables | |
8832 | ||
8833 | Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); | |
8834 | Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); | |
8835 | ||
8836 | -- Start of processing for Is_Interface_Conformant | |
8837 | ||
ce2b6ba5 JM |
8838 | begin |
8839 | pragma Assert (Is_Subprogram (Iface_Prim) | |
8840 | and then Is_Subprogram (Prim) | |
8841 | and then Is_Dispatching_Operation (Iface_Prim) | |
8842 | and then Is_Dispatching_Operation (Prim)); | |
8843 | ||
fceeaab6 | 8844 | pragma Assert (Is_Interface (Iface) |
ce2b6ba5 JM |
8845 | or else (Present (Alias (Iface_Prim)) |
8846 | and then | |
8847 | Is_Interface | |
8848 | (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); | |
8849 | ||
8850 | if Prim = Iface_Prim | |
8851 | or else not Is_Subprogram (Prim) | |
8852 | or else Ekind (Prim) /= Ekind (Iface_Prim) | |
8853 | or else not Is_Dispatching_Operation (Prim) | |
8854 | or else Scope (Prim) /= Scope (Tagged_Type) | |
fceeaab6 ES |
8855 | or else No (Typ) |
8856 | or else Base_Type (Typ) /= Tagged_Type | |
ce2b6ba5 JM |
8857 | or else not Primitive_Names_Match (Iface_Prim, Prim) |
8858 | then | |
8859 | return False; | |
8860 | ||
25ebc085 AC |
8861 | -- The mode of the controlling formals must match |
8862 | ||
8863 | elsif Present (Iface_Ctrl_F) | |
8864 | and then Present (Prim_Ctrl_F) | |
8865 | and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) | |
8866 | then | |
8867 | return False; | |
8868 | ||
8869 | -- Case of a procedure, or a function whose result type matches the | |
8870 | -- result type of the interface primitive, or a function that has no | |
8871 | -- controlling result (I or access I). | |
ce2b6ba5 JM |
8872 | |
8873 | elsif Ekind (Iface_Prim) = E_Procedure | |
8874 | or else Etype (Prim) = Etype (Iface_Prim) | |
fceeaab6 | 8875 | or else not Has_Controlling_Result (Prim) |
ce2b6ba5 | 8876 | then |
b4d7b435 AC |
8877 | return Type_Conformant |
8878 | (Iface_Prim, Prim, Skip_Controlling_Formals => True); | |
ce2b6ba5 | 8879 | |
fceeaab6 ES |
8880 | -- Case of a function returning an interface, or an access to one. |
8881 | -- Check that the return types correspond. | |
ce2b6ba5 | 8882 | |
fceeaab6 ES |
8883 | elsif Implements_Interface (Typ, Iface) then |
8884 | if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) | |
9a3c9940 RD |
8885 | /= |
8886 | (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) | |
fceeaab6 ES |
8887 | then |
8888 | return False; | |
fceeaab6 ES |
8889 | else |
8890 | return | |
ce2b6ba5 JM |
8891 | Type_Conformant (Prim, Iface_Prim, |
8892 | Skip_Controlling_Formals => True); | |
fceeaab6 | 8893 | end if; |
ce2b6ba5 | 8894 | |
fceeaab6 ES |
8895 | else |
8896 | return False; | |
ce2b6ba5 | 8897 | end if; |
ce2b6ba5 JM |
8898 | end Is_Interface_Conformant; |
8899 | ||
996ae0b0 RK |
8900 | --------------------------------- |
8901 | -- Is_Non_Overriding_Operation -- | |
8902 | --------------------------------- | |
8903 | ||
8904 | function Is_Non_Overriding_Operation | |
8905 | (Prev_E : Entity_Id; | |
d05ef0ab | 8906 | New_E : Entity_Id) return Boolean |
996ae0b0 RK |
8907 | is |
8908 | Formal : Entity_Id; | |
8909 | F_Typ : Entity_Id; | |
8910 | G_Typ : Entity_Id := Empty; | |
8911 | ||
8912 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; | |
5d37ba92 ES |
8913 | -- If F_Type is a derived type associated with a generic actual subtype, |
8914 | -- then return its Generic_Parent_Type attribute, else return Empty. | |
996ae0b0 RK |
8915 | |
8916 | function Types_Correspond | |
8917 | (P_Type : Entity_Id; | |
d05ef0ab | 8918 | N_Type : Entity_Id) return Boolean; |
82c80734 RD |
8919 | -- Returns true if and only if the types (or designated types in the |
8920 | -- case of anonymous access types) are the same or N_Type is derived | |
8921 | -- directly or indirectly from P_Type. | |
996ae0b0 RK |
8922 | |
8923 | ----------------------------- | |
8924 | -- Get_Generic_Parent_Type -- | |
8925 | ----------------------------- | |
8926 | ||
8927 | function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is | |
8928 | G_Typ : Entity_Id; | |
702d2020 | 8929 | Defn : Node_Id; |
996ae0b0 RK |
8930 | Indic : Node_Id; |
8931 | ||
8932 | begin | |
8933 | if Is_Derived_Type (F_Typ) | |
8934 | and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration | |
8935 | then | |
82c80734 RD |
8936 | -- The tree must be traversed to determine the parent subtype in |
8937 | -- the generic unit, which unfortunately isn't always available | |
8938 | -- via semantic attributes. ??? (Note: The use of Original_Node | |
8939 | -- is needed for cases where a full derived type has been | |
8940 | -- rewritten.) | |
996ae0b0 | 8941 | |
702d2020 AC |
8942 | Defn := Type_Definition (Original_Node (Parent (F_Typ))); |
8943 | if Nkind (Defn) = N_Derived_Type_Definition then | |
8944 | Indic := Subtype_Indication (Defn); | |
996ae0b0 | 8945 | |
702d2020 AC |
8946 | if Nkind (Indic) = N_Subtype_Indication then |
8947 | G_Typ := Entity (Subtype_Mark (Indic)); | |
8948 | else | |
8949 | G_Typ := Entity (Indic); | |
8950 | end if; | |
996ae0b0 | 8951 | |
702d2020 AC |
8952 | if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
8953 | and then Present (Generic_Parent_Type (Parent (G_Typ))) | |
8954 | then | |
8955 | return Generic_Parent_Type (Parent (G_Typ)); | |
8956 | end if; | |
996ae0b0 RK |
8957 | end if; |
8958 | end if; | |
8959 | ||
8960 | return Empty; | |
8961 | end Get_Generic_Parent_Type; | |
8962 | ||
8963 | ---------------------- | |
8964 | -- Types_Correspond -- | |
8965 | ---------------------- | |
8966 | ||
8967 | function Types_Correspond | |
8968 | (P_Type : Entity_Id; | |
d05ef0ab | 8969 | N_Type : Entity_Id) return Boolean |
996ae0b0 RK |
8970 | is |
8971 | Prev_Type : Entity_Id := Base_Type (P_Type); | |
8972 | New_Type : Entity_Id := Base_Type (N_Type); | |
8973 | ||
8974 | begin | |
8975 | if Ekind (Prev_Type) = E_Anonymous_Access_Type then | |
8976 | Prev_Type := Designated_Type (Prev_Type); | |
8977 | end if; | |
8978 | ||
8979 | if Ekind (New_Type) = E_Anonymous_Access_Type then | |
8980 | New_Type := Designated_Type (New_Type); | |
8981 | end if; | |
8982 | ||
8983 | if Prev_Type = New_Type then | |
8984 | return True; | |
8985 | ||
8986 | elsif not Is_Class_Wide_Type (New_Type) then | |
8987 | while Etype (New_Type) /= New_Type loop | |
8988 | New_Type := Etype (New_Type); | |
8989 | if New_Type = Prev_Type then | |
8990 | return True; | |
8991 | end if; | |
8992 | end loop; | |
8993 | end if; | |
8994 | return False; | |
8995 | end Types_Correspond; | |
8996 | ||
8997 | -- Start of processing for Is_Non_Overriding_Operation | |
8998 | ||
8999 | begin | |
82c80734 RD |
9000 | -- In the case where both operations are implicit derived subprograms |
9001 | -- then neither overrides the other. This can only occur in certain | |
9002 | -- obscure cases (e.g., derivation from homographs created in a generic | |
9003 | -- instantiation). | |
996ae0b0 RK |
9004 | |
9005 | if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then | |
9006 | return True; | |
9007 | ||
9008 | elsif Ekind (Current_Scope) = E_Package | |
9009 | and then Is_Generic_Instance (Current_Scope) | |
9010 | and then In_Private_Part (Current_Scope) | |
9011 | and then Comes_From_Source (New_E) | |
9012 | then | |
702d2020 AC |
9013 | -- We examine the formals and result type of the inherited operation, |
9014 | -- to determine whether their type is derived from (the instance of) | |
9015 | -- a generic type. The first such formal or result type is the one | |
9016 | -- tested. | |
996ae0b0 RK |
9017 | |
9018 | Formal := First_Formal (Prev_E); | |
996ae0b0 RK |
9019 | while Present (Formal) loop |
9020 | F_Typ := Base_Type (Etype (Formal)); | |
9021 | ||
9022 | if Ekind (F_Typ) = E_Anonymous_Access_Type then | |
9023 | F_Typ := Designated_Type (F_Typ); | |
9024 | end if; | |
9025 | ||
9026 | G_Typ := Get_Generic_Parent_Type (F_Typ); | |
702d2020 | 9027 | exit when Present (G_Typ); |
996ae0b0 RK |
9028 | |
9029 | Next_Formal (Formal); | |
9030 | end loop; | |
9031 | ||
c8ef728f | 9032 | if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
996ae0b0 RK |
9033 | G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
9034 | end if; | |
9035 | ||
9036 | if No (G_Typ) then | |
9037 | return False; | |
9038 | end if; | |
9039 | ||
8dbd1460 AC |
9040 | -- If the generic type is a private type, then the original operation |
9041 | -- was not overriding in the generic, because there was no primitive | |
9042 | -- operation to override. | |
996ae0b0 RK |
9043 | |
9044 | if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration | |
9045 | and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = | |
8dbd1460 | 9046 | N_Formal_Private_Type_Definition |
996ae0b0 RK |
9047 | then |
9048 | return True; | |
9049 | ||
9050 | -- The generic parent type is the ancestor of a formal derived | |
9051 | -- type declaration. We need to check whether it has a primitive | |
9052 | -- operation that should be overridden by New_E in the generic. | |
9053 | ||
9054 | else | |
9055 | declare | |
9056 | P_Formal : Entity_Id; | |
9057 | N_Formal : Entity_Id; | |
9058 | P_Typ : Entity_Id; | |
9059 | N_Typ : Entity_Id; | |
9060 | P_Prim : Entity_Id; | |
9061 | Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); | |
9062 | ||
9063 | begin | |
9064 | while Present (Prim_Elt) loop | |
9065 | P_Prim := Node (Prim_Elt); | |
fbf5a39b | 9066 | |
996ae0b0 RK |
9067 | if Chars (P_Prim) = Chars (New_E) |
9068 | and then Ekind (P_Prim) = Ekind (New_E) | |
9069 | then | |
9070 | P_Formal := First_Formal (P_Prim); | |
9071 | N_Formal := First_Formal (New_E); | |
9072 | while Present (P_Formal) and then Present (N_Formal) loop | |
9073 | P_Typ := Etype (P_Formal); | |
9074 | N_Typ := Etype (N_Formal); | |
9075 | ||
9076 | if not Types_Correspond (P_Typ, N_Typ) then | |
9077 | exit; | |
9078 | end if; | |
9079 | ||
9080 | Next_Entity (P_Formal); | |
9081 | Next_Entity (N_Formal); | |
9082 | end loop; | |
9083 | ||
82c80734 RD |
9084 | -- Found a matching primitive operation belonging to the |
9085 | -- formal ancestor type, so the new subprogram is | |
9086 | -- overriding. | |
996ae0b0 | 9087 | |
c8ef728f ES |
9088 | if No (P_Formal) |
9089 | and then No (N_Formal) | |
996ae0b0 RK |
9090 | and then (Ekind (New_E) /= E_Function |
9091 | or else | |
9092 | Types_Correspond | |
9093 | (Etype (P_Prim), Etype (New_E))) | |
9094 | then | |
9095 | return False; | |
9096 | end if; | |
9097 | end if; | |
9098 | ||
9099 | Next_Elmt (Prim_Elt); | |
9100 | end loop; | |
9101 | ||
82c80734 RD |
9102 | -- If no match found, then the new subprogram does not |
9103 | -- override in the generic (nor in the instance). | |
996ae0b0 | 9104 | |
260359e3 AC |
9105 | -- If the type in question is not abstract, and the subprogram |
9106 | -- is, this will be an error if the new operation is in the | |
9107 | -- private part of the instance. Emit a warning now, which will | |
9108 | -- make the subsequent error message easier to understand. | |
9109 | ||
9110 | if not Is_Abstract_Type (F_Typ) | |
9111 | and then Is_Abstract_Subprogram (Prev_E) | |
9112 | and then In_Private_Part (Current_Scope) | |
9113 | then | |
9114 | Error_Msg_Node_2 := F_Typ; | |
9115 | Error_Msg_NE | |
9116 | ("private operation& in generic unit does not override " & | |
9117 | "any primitive operation of& (RM 12.3 (18))?", | |
9118 | New_E, New_E); | |
9119 | end if; | |
9120 | ||
996ae0b0 RK |
9121 | return True; |
9122 | end; | |
9123 | end if; | |
9124 | else | |
9125 | return False; | |
9126 | end if; | |
9127 | end Is_Non_Overriding_Operation; | |
9128 | ||
beacce02 AC |
9129 | ------------------------------------- |
9130 | -- List_Inherited_Pre_Post_Aspects -- | |
9131 | ------------------------------------- | |
9132 | ||
9133 | procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is | |
9134 | begin | |
e606088a | 9135 | if Opt.List_Inherited_Aspects |
beacce02 AC |
9136 | and then (Is_Subprogram (E) or else Is_Generic_Subprogram (E)) |
9137 | then | |
9138 | declare | |
9139 | Inherited : constant Subprogram_List := | |
9140 | Inherited_Subprograms (E); | |
9141 | P : Node_Id; | |
9142 | ||
9143 | begin | |
9144 | for J in Inherited'Range loop | |
dac3bede YM |
9145 | P := Spec_PPC_List (Contract (Inherited (J))); |
9146 | ||
beacce02 AC |
9147 | while Present (P) loop |
9148 | Error_Msg_Sloc := Sloc (P); | |
9149 | ||
9150 | if Class_Present (P) and then not Split_PPC (P) then | |
9151 | if Pragma_Name (P) = Name_Precondition then | |
9152 | Error_Msg_N | |
9153 | ("?info: & inherits `Pre''Class` aspect from #", E); | |
9154 | else | |
9155 | Error_Msg_N | |
9156 | ("?info: & inherits `Post''Class` aspect from #", E); | |
9157 | end if; | |
9158 | end if; | |
9159 | ||
9160 | P := Next_Pragma (P); | |
9161 | end loop; | |
9162 | end loop; | |
9163 | end; | |
9164 | end if; | |
9165 | end List_Inherited_Pre_Post_Aspects; | |
9166 | ||
996ae0b0 RK |
9167 | ------------------------------ |
9168 | -- Make_Inequality_Operator -- | |
9169 | ------------------------------ | |
9170 | ||
9171 | -- S is the defining identifier of an equality operator. We build a | |
9172 | -- subprogram declaration with the right signature. This operation is | |
9173 | -- intrinsic, because it is always expanded as the negation of the | |
9174 | -- call to the equality function. | |
9175 | ||
9176 | procedure Make_Inequality_Operator (S : Entity_Id) is | |
9177 | Loc : constant Source_Ptr := Sloc (S); | |
9178 | Decl : Node_Id; | |
9179 | Formals : List_Id; | |
9180 | Op_Name : Entity_Id; | |
9181 | ||
c8ef728f ES |
9182 | FF : constant Entity_Id := First_Formal (S); |
9183 | NF : constant Entity_Id := Next_Formal (FF); | |
996ae0b0 RK |
9184 | |
9185 | begin | |
c8ef728f | 9186 | -- Check that equality was properly defined, ignore call if not |
996ae0b0 | 9187 | |
c8ef728f | 9188 | if No (NF) then |
996ae0b0 RK |
9189 | return; |
9190 | end if; | |
9191 | ||
c8ef728f ES |
9192 | declare |
9193 | A : constant Entity_Id := | |
9194 | Make_Defining_Identifier (Sloc (FF), | |
9195 | Chars => Chars (FF)); | |
9196 | ||
5d37ba92 ES |
9197 | B : constant Entity_Id := |
9198 | Make_Defining_Identifier (Sloc (NF), | |
9199 | Chars => Chars (NF)); | |
c8ef728f ES |
9200 | |
9201 | begin | |
9202 | Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); | |
9203 | ||
9204 | Formals := New_List ( | |
9205 | Make_Parameter_Specification (Loc, | |
9206 | Defining_Identifier => A, | |
9207 | Parameter_Type => | |
9208 | New_Reference_To (Etype (First_Formal (S)), | |
9209 | Sloc (Etype (First_Formal (S))))), | |
9210 | ||
9211 | Make_Parameter_Specification (Loc, | |
9212 | Defining_Identifier => B, | |
9213 | Parameter_Type => | |
9214 | New_Reference_To (Etype (Next_Formal (First_Formal (S))), | |
9215 | Sloc (Etype (Next_Formal (First_Formal (S))))))); | |
9216 | ||
9217 | Decl := | |
9218 | Make_Subprogram_Declaration (Loc, | |
9219 | Specification => | |
9220 | Make_Function_Specification (Loc, | |
9221 | Defining_Unit_Name => Op_Name, | |
9222 | Parameter_Specifications => Formals, | |
9223 | Result_Definition => | |
9224 | New_Reference_To (Standard_Boolean, Loc))); | |
9225 | ||
9226 | -- Insert inequality right after equality if it is explicit or after | |
9227 | -- the derived type when implicit. These entities are created only | |
9228 | -- for visibility purposes, and eventually replaced in the course of | |
9229 | -- expansion, so they do not need to be attached to the tree and seen | |
9230 | -- by the back-end. Keeping them internal also avoids spurious | |
9231 | -- freezing problems. The declaration is inserted in the tree for | |
9232 | -- analysis, and removed afterwards. If the equality operator comes | |
9233 | -- from an explicit declaration, attach the inequality immediately | |
9234 | -- after. Else the equality is inherited from a derived type | |
9235 | -- declaration, so insert inequality after that declaration. | |
9236 | ||
9237 | if No (Alias (S)) then | |
9238 | Insert_After (Unit_Declaration_Node (S), Decl); | |
9239 | elsif Is_List_Member (Parent (S)) then | |
9240 | Insert_After (Parent (S), Decl); | |
9241 | else | |
9242 | Insert_After (Parent (Etype (First_Formal (S))), Decl); | |
9243 | end if; | |
996ae0b0 | 9244 | |
c8ef728f ES |
9245 | Mark_Rewrite_Insertion (Decl); |
9246 | Set_Is_Intrinsic_Subprogram (Op_Name); | |
9247 | Analyze (Decl); | |
9248 | Remove (Decl); | |
9249 | Set_Has_Completion (Op_Name); | |
9250 | Set_Corresponding_Equality (Op_Name, S); | |
f937473f | 9251 | Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
c8ef728f | 9252 | end; |
996ae0b0 RK |
9253 | end Make_Inequality_Operator; |
9254 | ||
9255 | ---------------------- | |
9256 | -- May_Need_Actuals -- | |
9257 | ---------------------- | |
9258 | ||
9259 | procedure May_Need_Actuals (Fun : Entity_Id) is | |
9260 | F : Entity_Id; | |
9261 | B : Boolean; | |
9262 | ||
9263 | begin | |
9264 | F := First_Formal (Fun); | |
9265 | B := True; | |
996ae0b0 RK |
9266 | while Present (F) loop |
9267 | if No (Default_Value (F)) then | |
9268 | B := False; | |
9269 | exit; | |
9270 | end if; | |
9271 | ||
9272 | Next_Formal (F); | |
9273 | end loop; | |
9274 | ||
9275 | Set_Needs_No_Actuals (Fun, B); | |
9276 | end May_Need_Actuals; | |
9277 | ||
9278 | --------------------- | |
9279 | -- Mode_Conformant -- | |
9280 | --------------------- | |
9281 | ||
9282 | function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is | |
9283 | Result : Boolean; | |
996ae0b0 RK |
9284 | begin |
9285 | Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); | |
9286 | return Result; | |
9287 | end Mode_Conformant; | |
9288 | ||
9289 | --------------------------- | |
9290 | -- New_Overloaded_Entity -- | |
9291 | --------------------------- | |
9292 | ||
9293 | procedure New_Overloaded_Entity | |
9294 | (S : Entity_Id; | |
9295 | Derived_Type : Entity_Id := Empty) | |
9296 | is | |
ec4867fa | 9297 | Overridden_Subp : Entity_Id := Empty; |
758c442c GD |
9298 | -- Set if the current scope has an operation that is type-conformant |
9299 | -- with S, and becomes hidden by S. | |
9300 | ||
5d37ba92 ES |
9301 | Is_Primitive_Subp : Boolean; |
9302 | -- Set to True if the new subprogram is primitive | |
9303 | ||
fbf5a39b AC |
9304 | E : Entity_Id; |
9305 | -- Entity that S overrides | |
9306 | ||
996ae0b0 | 9307 | Prev_Vis : Entity_Id := Empty; |
ec4867fa ES |
9308 | -- Predecessor of E in Homonym chain |
9309 | ||
5d37ba92 ES |
9310 | procedure Check_For_Primitive_Subprogram |
9311 | (Is_Primitive : out Boolean; | |
9312 | Is_Overriding : Boolean := False); | |
9313 | -- If the subprogram being analyzed is a primitive operation of the type | |
9314 | -- of a formal or result, set the Has_Primitive_Operations flag on the | |
9315 | -- type, and set Is_Primitive to True (otherwise set to False). Set the | |
9316 | -- corresponding flag on the entity itself for later use. | |
9317 | ||
ec4867fa ES |
9318 | procedure Check_Synchronized_Overriding |
9319 | (Def_Id : Entity_Id; | |
ec4867fa ES |
9320 | Overridden_Subp : out Entity_Id); |
9321 | -- First determine if Def_Id is an entry or a subprogram either defined | |
9322 | -- in the scope of a task or protected type, or is a primitive of such | |
9323 | -- a type. Check whether Def_Id overrides a subprogram of an interface | |
9324 | -- implemented by the synchronized type, return the overridden entity | |
9325 | -- or Empty. | |
758c442c | 9326 | |
996ae0b0 RK |
9327 | function Is_Private_Declaration (E : Entity_Id) return Boolean; |
9328 | -- Check that E is declared in the private part of the current package, | |
9329 | -- or in the package body, where it may hide a previous declaration. | |
fbf5a39b | 9330 | -- We can't use In_Private_Part by itself because this flag is also |
996ae0b0 RK |
9331 | -- set when freezing entities, so we must examine the place of the |
9332 | -- declaration in the tree, and recognize wrapper packages as well. | |
9333 | ||
2ddc2000 AC |
9334 | function Is_Overriding_Alias |
9335 | (Old_E : Entity_Id; | |
9336 | New_E : Entity_Id) return Boolean; | |
9337 | -- Check whether new subprogram and old subprogram are both inherited | |
9338 | -- from subprograms that have distinct dispatch table entries. This can | |
9339 | -- occur with derivations from instances with accidental homonyms. | |
9340 | -- The function is conservative given that the converse is only true | |
9341 | -- within instances that contain accidental overloadings. | |
9342 | ||
5d37ba92 ES |
9343 | ------------------------------------ |
9344 | -- Check_For_Primitive_Subprogram -- | |
9345 | ------------------------------------ | |
996ae0b0 | 9346 | |
5d37ba92 ES |
9347 | procedure Check_For_Primitive_Subprogram |
9348 | (Is_Primitive : out Boolean; | |
9349 | Is_Overriding : Boolean := False) | |
ec4867fa | 9350 | is |
996ae0b0 RK |
9351 | Formal : Entity_Id; |
9352 | F_Typ : Entity_Id; | |
07fc65c4 | 9353 | B_Typ : Entity_Id; |
996ae0b0 RK |
9354 | |
9355 | function Visible_Part_Type (T : Entity_Id) return Boolean; | |
8dbd1460 AC |
9356 | -- Returns true if T is declared in the visible part of the current |
9357 | -- package scope; otherwise returns false. Assumes that T is declared | |
9358 | -- in a package. | |
996ae0b0 RK |
9359 | |
9360 | procedure Check_Private_Overriding (T : Entity_Id); | |
9361 | -- Checks that if a primitive abstract subprogram of a visible | |
8dbd1460 AC |
9362 | -- abstract type is declared in a private part, then it must override |
9363 | -- an abstract subprogram declared in the visible part. Also checks | |
9364 | -- that if a primitive function with a controlling result is declared | |
9365 | -- in a private part, then it must override a function declared in | |
9366 | -- the visible part. | |
996ae0b0 RK |
9367 | |
9368 | ------------------------------ | |
9369 | -- Check_Private_Overriding -- | |
9370 | ------------------------------ | |
9371 | ||
9372 | procedure Check_Private_Overriding (T : Entity_Id) is | |
9373 | begin | |
51c16e29 | 9374 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
9375 | and then In_Private_Part (Current_Scope) |
9376 | and then Visible_Part_Type (T) | |
9377 | and then not In_Instance | |
9378 | then | |
f937473f RD |
9379 | if Is_Abstract_Type (T) |
9380 | and then Is_Abstract_Subprogram (S) | |
9381 | and then (not Is_Overriding | |
8dbd1460 | 9382 | or else not Is_Abstract_Subprogram (E)) |
996ae0b0 | 9383 | then |
ed2233dc | 9384 | Error_Msg_N |
19d846a0 RD |
9385 | ("abstract subprograms must be visible " |
9386 | & "(RM 3.9.3(10))!", S); | |
758c442c | 9387 | |
996ae0b0 | 9388 | elsif Ekind (S) = E_Function |
82c80734 | 9389 | and then not Is_Overriding |
996ae0b0 | 9390 | then |
2e79de51 AC |
9391 | if Is_Tagged_Type (T) |
9392 | and then T = Base_Type (Etype (S)) | |
9393 | then | |
9394 | Error_Msg_N | |
9395 | ("private function with tagged result must" | |
9396 | & " override visible-part function", S); | |
9397 | Error_Msg_N | |
9398 | ("\move subprogram to the visible part" | |
9399 | & " (RM 3.9.3(10))", S); | |
9400 | ||
9401 | -- AI05-0073: extend this test to the case of a function | |
9402 | -- with a controlling access result. | |
9403 | ||
9404 | elsif Ekind (Etype (S)) = E_Anonymous_Access_Type | |
9405 | and then Is_Tagged_Type (Designated_Type (Etype (S))) | |
9406 | and then | |
9407 | not Is_Class_Wide_Type (Designated_Type (Etype (S))) | |
dbe945f1 | 9408 | and then Ada_Version >= Ada_2012 |
2e79de51 AC |
9409 | then |
9410 | Error_Msg_N | |
9411 | ("private function with controlling access result " | |
9412 | & "must override visible-part function", S); | |
9413 | Error_Msg_N | |
9414 | ("\move subprogram to the visible part" | |
9415 | & " (RM 3.9.3(10))", S); | |
9416 | end if; | |
996ae0b0 RK |
9417 | end if; |
9418 | end if; | |
9419 | end Check_Private_Overriding; | |
9420 | ||
9421 | ----------------------- | |
9422 | -- Visible_Part_Type -- | |
9423 | ----------------------- | |
9424 | ||
9425 | function Visible_Part_Type (T : Entity_Id) return Boolean is | |
07fc65c4 GB |
9426 | P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
9427 | N : Node_Id; | |
996ae0b0 RK |
9428 | |
9429 | begin | |
8dbd1460 AC |
9430 | -- If the entity is a private type, then it must be declared in a |
9431 | -- visible part. | |
996ae0b0 RK |
9432 | |
9433 | if Ekind (T) in Private_Kind then | |
9434 | return True; | |
9435 | end if; | |
9436 | ||
9437 | -- Otherwise, we traverse the visible part looking for its | |
9438 | -- corresponding declaration. We cannot use the declaration | |
9439 | -- node directly because in the private part the entity of a | |
9440 | -- private type is the one in the full view, which does not | |
9441 | -- indicate that it is the completion of something visible. | |
9442 | ||
07fc65c4 | 9443 | N := First (Visible_Declarations (Specification (P))); |
996ae0b0 RK |
9444 | while Present (N) loop |
9445 | if Nkind (N) = N_Full_Type_Declaration | |
9446 | and then Present (Defining_Identifier (N)) | |
9447 | and then T = Defining_Identifier (N) | |
9448 | then | |
9449 | return True; | |
9450 | ||
800621e0 RD |
9451 | elsif Nkind_In (N, N_Private_Type_Declaration, |
9452 | N_Private_Extension_Declaration) | |
996ae0b0 RK |
9453 | and then Present (Defining_Identifier (N)) |
9454 | and then T = Full_View (Defining_Identifier (N)) | |
9455 | then | |
9456 | return True; | |
9457 | end if; | |
9458 | ||
9459 | Next (N); | |
9460 | end loop; | |
9461 | ||
9462 | return False; | |
9463 | end Visible_Part_Type; | |
9464 | ||
5d37ba92 | 9465 | -- Start of processing for Check_For_Primitive_Subprogram |
996ae0b0 RK |
9466 | |
9467 | begin | |
5d37ba92 ES |
9468 | Is_Primitive := False; |
9469 | ||
996ae0b0 RK |
9470 | if not Comes_From_Source (S) then |
9471 | null; | |
9472 | ||
5d37ba92 | 9473 | -- If subprogram is at library level, it is not primitive operation |
15ce9ca2 AC |
9474 | |
9475 | elsif Current_Scope = Standard_Standard then | |
9476 | null; | |
9477 | ||
b9b2405f | 9478 | elsif (Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 | 9479 | and then not In_Package_Body (Current_Scope)) |
82c80734 | 9480 | or else Is_Overriding |
996ae0b0 | 9481 | then |
07fc65c4 | 9482 | -- For function, check return type |
996ae0b0 | 9483 | |
07fc65c4 | 9484 | if Ekind (S) = E_Function then |
5d37ba92 ES |
9485 | if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
9486 | F_Typ := Designated_Type (Etype (S)); | |
9487 | else | |
9488 | F_Typ := Etype (S); | |
9489 | end if; | |
9490 | ||
9491 | B_Typ := Base_Type (F_Typ); | |
07fc65c4 | 9492 | |
5d37ba92 ES |
9493 | if Scope (B_Typ) = Current_Scope |
9494 | and then not Is_Class_Wide_Type (B_Typ) | |
9495 | and then not Is_Generic_Type (B_Typ) | |
9496 | then | |
9497 | Is_Primitive := True; | |
07fc65c4 | 9498 | Set_Has_Primitive_Operations (B_Typ); |
5d37ba92 | 9499 | Set_Is_Primitive (S); |
07fc65c4 GB |
9500 | Check_Private_Overriding (B_Typ); |
9501 | end if; | |
996ae0b0 RK |
9502 | end if; |
9503 | ||
07fc65c4 | 9504 | -- For all subprograms, check formals |
996ae0b0 | 9505 | |
07fc65c4 | 9506 | Formal := First_Formal (S); |
996ae0b0 RK |
9507 | while Present (Formal) loop |
9508 | if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then | |
9509 | F_Typ := Designated_Type (Etype (Formal)); | |
9510 | else | |
9511 | F_Typ := Etype (Formal); | |
9512 | end if; | |
9513 | ||
07fc65c4 GB |
9514 | B_Typ := Base_Type (F_Typ); |
9515 | ||
ec4867fa ES |
9516 | if Ekind (B_Typ) = E_Access_Subtype then |
9517 | B_Typ := Base_Type (B_Typ); | |
9518 | end if; | |
9519 | ||
5d37ba92 ES |
9520 | if Scope (B_Typ) = Current_Scope |
9521 | and then not Is_Class_Wide_Type (B_Typ) | |
9522 | and then not Is_Generic_Type (B_Typ) | |
9523 | then | |
9524 | Is_Primitive := True; | |
9525 | Set_Is_Primitive (S); | |
07fc65c4 GB |
9526 | Set_Has_Primitive_Operations (B_Typ); |
9527 | Check_Private_Overriding (B_Typ); | |
996ae0b0 RK |
9528 | end if; |
9529 | ||
9530 | Next_Formal (Formal); | |
9531 | end loop; | |
996ae0b0 | 9532 | end if; |
5d37ba92 ES |
9533 | end Check_For_Primitive_Subprogram; |
9534 | ||
9535 | ----------------------------------- | |
9536 | -- Check_Synchronized_Overriding -- | |
9537 | ----------------------------------- | |
9538 | ||
9539 | procedure Check_Synchronized_Overriding | |
9540 | (Def_Id : Entity_Id; | |
5d37ba92 ES |
9541 | Overridden_Subp : out Entity_Id) |
9542 | is | |
5d37ba92 ES |
9543 | Ifaces_List : Elist_Id; |
9544 | In_Scope : Boolean; | |
9545 | Typ : Entity_Id; | |
9546 | ||
8aa15e3b JM |
9547 | function Matches_Prefixed_View_Profile |
9548 | (Prim_Params : List_Id; | |
9549 | Iface_Params : List_Id) return Boolean; | |
9550 | -- Determine whether a subprogram's parameter profile Prim_Params | |
9551 | -- matches that of a potentially overridden interface subprogram | |
9552 | -- Iface_Params. Also determine if the type of first parameter of | |
9553 | -- Iface_Params is an implemented interface. | |
9554 | ||
8aa15e3b JM |
9555 | ----------------------------------- |
9556 | -- Matches_Prefixed_View_Profile -- | |
9557 | ----------------------------------- | |
9558 | ||
9559 | function Matches_Prefixed_View_Profile | |
9560 | (Prim_Params : List_Id; | |
9561 | Iface_Params : List_Id) return Boolean | |
9562 | is | |
9563 | Iface_Id : Entity_Id; | |
9564 | Iface_Param : Node_Id; | |
9565 | Iface_Typ : Entity_Id; | |
9566 | Prim_Id : Entity_Id; | |
9567 | Prim_Param : Node_Id; | |
9568 | Prim_Typ : Entity_Id; | |
9569 | ||
9570 | function Is_Implemented | |
9571 | (Ifaces_List : Elist_Id; | |
9572 | Iface : Entity_Id) return Boolean; | |
9573 | -- Determine if Iface is implemented by the current task or | |
9574 | -- protected type. | |
9575 | ||
9576 | -------------------- | |
9577 | -- Is_Implemented -- | |
9578 | -------------------- | |
9579 | ||
9580 | function Is_Implemented | |
9581 | (Ifaces_List : Elist_Id; | |
9582 | Iface : Entity_Id) return Boolean | |
9583 | is | |
9584 | Iface_Elmt : Elmt_Id; | |
9585 | ||
9586 | begin | |
9587 | Iface_Elmt := First_Elmt (Ifaces_List); | |
9588 | while Present (Iface_Elmt) loop | |
9589 | if Node (Iface_Elmt) = Iface then | |
9590 | return True; | |
9591 | end if; | |
9592 | ||
9593 | Next_Elmt (Iface_Elmt); | |
9594 | end loop; | |
9595 | ||
9596 | return False; | |
9597 | end Is_Implemented; | |
9598 | ||
9599 | -- Start of processing for Matches_Prefixed_View_Profile | |
9600 | ||
9601 | begin | |
9602 | Iface_Param := First (Iface_Params); | |
9603 | Iface_Typ := Etype (Defining_Identifier (Iface_Param)); | |
9604 | ||
9605 | if Is_Access_Type (Iface_Typ) then | |
9606 | Iface_Typ := Designated_Type (Iface_Typ); | |
9607 | end if; | |
9608 | ||
9609 | Prim_Param := First (Prim_Params); | |
9610 | ||
9611 | -- The first parameter of the potentially overridden subprogram | |
9612 | -- must be an interface implemented by Prim. | |
9613 | ||
9614 | if not Is_Interface (Iface_Typ) | |
9615 | or else not Is_Implemented (Ifaces_List, Iface_Typ) | |
9616 | then | |
9617 | return False; | |
9618 | end if; | |
9619 | ||
9620 | -- The checks on the object parameters are done, move onto the | |
9621 | -- rest of the parameters. | |
9622 | ||
9623 | if not In_Scope then | |
9624 | Prim_Param := Next (Prim_Param); | |
9625 | end if; | |
9626 | ||
9627 | Iface_Param := Next (Iface_Param); | |
9628 | while Present (Iface_Param) and then Present (Prim_Param) loop | |
9629 | Iface_Id := Defining_Identifier (Iface_Param); | |
9630 | Iface_Typ := Find_Parameter_Type (Iface_Param); | |
9631 | ||
8aa15e3b JM |
9632 | Prim_Id := Defining_Identifier (Prim_Param); |
9633 | Prim_Typ := Find_Parameter_Type (Prim_Param); | |
9634 | ||
15e4986c JM |
9635 | if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
9636 | and then Ekind (Prim_Typ) = E_Anonymous_Access_Type | |
9637 | and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) | |
9638 | then | |
9639 | Iface_Typ := Designated_Type (Iface_Typ); | |
9640 | Prim_Typ := Designated_Type (Prim_Typ); | |
8aa15e3b JM |
9641 | end if; |
9642 | ||
9643 | -- Case of multiple interface types inside a parameter profile | |
9644 | ||
9645 | -- (Obj_Param : in out Iface; ...; Param : Iface) | |
9646 | ||
9647 | -- If the interface type is implemented, then the matching type | |
9648 | -- in the primitive should be the implementing record type. | |
9649 | ||
9650 | if Ekind (Iface_Typ) = E_Record_Type | |
9651 | and then Is_Interface (Iface_Typ) | |
9652 | and then Is_Implemented (Ifaces_List, Iface_Typ) | |
9653 | then | |
9654 | if Prim_Typ /= Typ then | |
9655 | return False; | |
9656 | end if; | |
9657 | ||
9658 | -- The two parameters must be both mode and subtype conformant | |
9659 | ||
9660 | elsif Ekind (Iface_Id) /= Ekind (Prim_Id) | |
9661 | or else not | |
9662 | Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) | |
9663 | then | |
9664 | return False; | |
9665 | end if; | |
9666 | ||
9667 | Next (Iface_Param); | |
9668 | Next (Prim_Param); | |
9669 | end loop; | |
9670 | ||
9671 | -- One of the two lists contains more parameters than the other | |
9672 | ||
9673 | if Present (Iface_Param) or else Present (Prim_Param) then | |
9674 | return False; | |
9675 | end if; | |
9676 | ||
9677 | return True; | |
9678 | end Matches_Prefixed_View_Profile; | |
9679 | ||
9680 | -- Start of processing for Check_Synchronized_Overriding | |
9681 | ||
5d37ba92 ES |
9682 | begin |
9683 | Overridden_Subp := Empty; | |
9684 | ||
8aa15e3b JM |
9685 | -- Def_Id must be an entry or a subprogram. We should skip predefined |
9686 | -- primitives internally generated by the frontend; however at this | |
9687 | -- stage predefined primitives are still not fully decorated. As a | |
9688 | -- minor optimization we skip here internally generated subprograms. | |
5d37ba92 | 9689 | |
8aa15e3b JM |
9690 | if (Ekind (Def_Id) /= E_Entry |
9691 | and then Ekind (Def_Id) /= E_Function | |
9692 | and then Ekind (Def_Id) /= E_Procedure) | |
9693 | or else not Comes_From_Source (Def_Id) | |
5d37ba92 ES |
9694 | then |
9695 | return; | |
9696 | end if; | |
9697 | ||
9698 | -- Search for the concurrent declaration since it contains the list | |
9699 | -- of all implemented interfaces. In this case, the subprogram is | |
9700 | -- declared within the scope of a protected or a task type. | |
9701 | ||
9702 | if Present (Scope (Def_Id)) | |
9703 | and then Is_Concurrent_Type (Scope (Def_Id)) | |
9704 | and then not Is_Generic_Actual_Type (Scope (Def_Id)) | |
9705 | then | |
9706 | Typ := Scope (Def_Id); | |
9707 | In_Scope := True; | |
9708 | ||
8aa15e3b | 9709 | -- The enclosing scope is not a synchronized type and the subprogram |
4adf3c50 | 9710 | -- has no formals. |
8aa15e3b JM |
9711 | |
9712 | elsif No (First_Formal (Def_Id)) then | |
9713 | return; | |
5d37ba92 | 9714 | |
8aa15e3b | 9715 | -- The subprogram has formals and hence it may be a primitive of a |
4adf3c50 | 9716 | -- concurrent type. |
5d37ba92 | 9717 | |
8aa15e3b JM |
9718 | else |
9719 | Typ := Etype (First_Formal (Def_Id)); | |
9720 | ||
9721 | if Is_Access_Type (Typ) then | |
9722 | Typ := Directly_Designated_Type (Typ); | |
8c3dd7a8 JM |
9723 | end if; |
9724 | ||
8aa15e3b JM |
9725 | if Is_Concurrent_Type (Typ) |
9726 | and then not Is_Generic_Actual_Type (Typ) | |
5d37ba92 | 9727 | then |
5d37ba92 ES |
9728 | In_Scope := False; |
9729 | ||
9730 | -- This case occurs when the concurrent type is declared within | |
9731 | -- a generic unit. As a result the corresponding record has been | |
9732 | -- built and used as the type of the first formal, we just have | |
9733 | -- to retrieve the corresponding concurrent type. | |
9734 | ||
8aa15e3b | 9735 | elsif Is_Concurrent_Record_Type (Typ) |
dd54644b | 9736 | and then not Is_Class_Wide_Type (Typ) |
8aa15e3b | 9737 | and then Present (Corresponding_Concurrent_Type (Typ)) |
5d37ba92 | 9738 | then |
8aa15e3b | 9739 | Typ := Corresponding_Concurrent_Type (Typ); |
5d37ba92 ES |
9740 | In_Scope := False; |
9741 | ||
9742 | else | |
9743 | return; | |
9744 | end if; | |
8aa15e3b JM |
9745 | end if; |
9746 | ||
9747 | -- There is no overriding to check if is an inherited operation in a | |
9748 | -- type derivation on for a generic actual. | |
9749 | ||
9750 | Collect_Interfaces (Typ, Ifaces_List); | |
9751 | ||
9752 | if Is_Empty_Elmt_List (Ifaces_List) then | |
5d37ba92 ES |
9753 | return; |
9754 | end if; | |
9755 | ||
8aa15e3b JM |
9756 | -- Determine whether entry or subprogram Def_Id overrides a primitive |
9757 | -- operation that belongs to one of the interfaces in Ifaces_List. | |
5d37ba92 | 9758 | |
8aa15e3b JM |
9759 | declare |
9760 | Candidate : Entity_Id := Empty; | |
9761 | Hom : Entity_Id := Empty; | |
9762 | Iface_Typ : Entity_Id; | |
9763 | Subp : Entity_Id := Empty; | |
9764 | ||
9765 | begin | |
4adf3c50 | 9766 | -- Traverse the homonym chain, looking for a potentially |
8aa15e3b JM |
9767 | -- overridden subprogram that belongs to an implemented |
9768 | -- interface. | |
9769 | ||
9770 | Hom := Current_Entity_In_Scope (Def_Id); | |
9771 | while Present (Hom) loop | |
9772 | Subp := Hom; | |
9773 | ||
15e4986c JM |
9774 | if Subp = Def_Id |
9775 | or else not Is_Overloadable (Subp) | |
9776 | or else not Is_Primitive (Subp) | |
9777 | or else not Is_Dispatching_Operation (Subp) | |
79afa047 | 9778 | or else not Present (Find_Dispatching_Type (Subp)) |
15e4986c | 9779 | or else not Is_Interface (Find_Dispatching_Type (Subp)) |
8aa15e3b | 9780 | then |
15e4986c | 9781 | null; |
8aa15e3b | 9782 | |
15e4986c | 9783 | -- Entries and procedures can override abstract or null |
4adf3c50 | 9784 | -- interface procedures. |
8aa15e3b | 9785 | |
15e4986c JM |
9786 | elsif (Ekind (Def_Id) = E_Procedure |
9787 | or else Ekind (Def_Id) = E_Entry) | |
8aa15e3b | 9788 | and then Ekind (Subp) = E_Procedure |
8aa15e3b JM |
9789 | and then Matches_Prefixed_View_Profile |
9790 | (Parameter_Specifications (Parent (Def_Id)), | |
9791 | Parameter_Specifications (Parent (Subp))) | |
9792 | then | |
9793 | Candidate := Subp; | |
9794 | ||
15e4986c JM |
9795 | -- For an overridden subprogram Subp, check whether the mode |
9796 | -- of its first parameter is correct depending on the kind | |
9797 | -- of synchronized type. | |
8aa15e3b | 9798 | |
15e4986c JM |
9799 | declare |
9800 | Formal : constant Node_Id := First_Formal (Candidate); | |
9801 | ||
9802 | begin | |
9803 | -- In order for an entry or a protected procedure to | |
9804 | -- override, the first parameter of the overridden | |
9805 | -- routine must be of mode "out", "in out" or | |
9806 | -- access-to-variable. | |
9807 | ||
9808 | if (Ekind (Candidate) = E_Entry | |
9809 | or else Ekind (Candidate) = E_Procedure) | |
9810 | and then Is_Protected_Type (Typ) | |
9811 | and then Ekind (Formal) /= E_In_Out_Parameter | |
9812 | and then Ekind (Formal) /= E_Out_Parameter | |
9813 | and then Nkind (Parameter_Type (Parent (Formal))) | |
9814 | /= N_Access_Definition | |
9815 | then | |
9816 | null; | |
9817 | ||
9818 | -- All other cases are OK since a task entry or routine | |
9819 | -- does not have a restriction on the mode of the first | |
9820 | -- parameter of the overridden interface routine. | |
9821 | ||
9822 | else | |
9823 | Overridden_Subp := Candidate; | |
9824 | return; | |
9825 | end if; | |
9826 | end; | |
8aa15e3b JM |
9827 | |
9828 | -- Functions can override abstract interface functions | |
9829 | ||
9830 | elsif Ekind (Def_Id) = E_Function | |
9831 | and then Ekind (Subp) = E_Function | |
8aa15e3b JM |
9832 | and then Matches_Prefixed_View_Profile |
9833 | (Parameter_Specifications (Parent (Def_Id)), | |
9834 | Parameter_Specifications (Parent (Subp))) | |
9835 | and then Etype (Result_Definition (Parent (Def_Id))) = | |
9836 | Etype (Result_Definition (Parent (Subp))) | |
9837 | then | |
9838 | Overridden_Subp := Subp; | |
9839 | return; | |
9840 | end if; | |
9841 | ||
9842 | Hom := Homonym (Hom); | |
9843 | end loop; | |
9844 | ||
4adf3c50 AC |
9845 | -- After examining all candidates for overriding, we are left with |
9846 | -- the best match which is a mode incompatible interface routine. | |
9847 | -- Do not emit an error if the Expander is active since this error | |
9848 | -- will be detected later on after all concurrent types are | |
9849 | -- expanded and all wrappers are built. This check is meant for | |
9850 | -- spec-only compilations. | |
8aa15e3b | 9851 | |
4adf3c50 | 9852 | if Present (Candidate) and then not Expander_Active then |
8aa15e3b JM |
9853 | Iface_Typ := |
9854 | Find_Parameter_Type (Parent (First_Formal (Candidate))); | |
9855 | ||
4adf3c50 AC |
9856 | -- Def_Id is primitive of a protected type, declared inside the |
9857 | -- type, and the candidate is primitive of a limited or | |
9858 | -- synchronized interface. | |
8aa15e3b JM |
9859 | |
9860 | if In_Scope | |
9861 | and then Is_Protected_Type (Typ) | |
9862 | and then | |
9863 | (Is_Limited_Interface (Iface_Typ) | |
c199ccf7 AC |
9864 | or else Is_Protected_Interface (Iface_Typ) |
9865 | or else Is_Synchronized_Interface (Iface_Typ) | |
9866 | or else Is_Task_Interface (Iface_Typ)) | |
8aa15e3b | 9867 | then |
dd54644b | 9868 | Error_Msg_PT (Parent (Typ), Candidate); |
8aa15e3b | 9869 | end if; |
5d37ba92 | 9870 | end if; |
8aa15e3b JM |
9871 | |
9872 | Overridden_Subp := Candidate; | |
9873 | return; | |
9874 | end; | |
5d37ba92 ES |
9875 | end Check_Synchronized_Overriding; |
9876 | ||
9877 | ---------------------------- | |
9878 | -- Is_Private_Declaration -- | |
9879 | ---------------------------- | |
9880 | ||
9881 | function Is_Private_Declaration (E : Entity_Id) return Boolean is | |
9882 | Priv_Decls : List_Id; | |
9883 | Decl : constant Node_Id := Unit_Declaration_Node (E); | |
9884 | ||
9885 | begin | |
9886 | if Is_Package_Or_Generic_Package (Current_Scope) | |
9887 | and then In_Private_Part (Current_Scope) | |
9888 | then | |
9889 | Priv_Decls := | |
a4901c08 AC |
9890 | Private_Declarations |
9891 | (Specification (Unit_Declaration_Node (Current_Scope))); | |
5d37ba92 ES |
9892 | |
9893 | return In_Package_Body (Current_Scope) | |
9894 | or else | |
9895 | (Is_List_Member (Decl) | |
a4901c08 | 9896 | and then List_Containing (Decl) = Priv_Decls) |
5d37ba92 | 9897 | or else (Nkind (Parent (Decl)) = N_Package_Specification |
a4901c08 AC |
9898 | and then not |
9899 | Is_Compilation_Unit | |
9900 | (Defining_Entity (Parent (Decl))) | |
9901 | and then List_Containing (Parent (Parent (Decl))) = | |
9902 | Priv_Decls); | |
5d37ba92 ES |
9903 | else |
9904 | return False; | |
9905 | end if; | |
9906 | end Is_Private_Declaration; | |
996ae0b0 | 9907 | |
2ddc2000 AC |
9908 | -------------------------- |
9909 | -- Is_Overriding_Alias -- | |
9910 | -------------------------- | |
9911 | ||
9912 | function Is_Overriding_Alias | |
9913 | (Old_E : Entity_Id; | |
9914 | New_E : Entity_Id) return Boolean | |
9915 | is | |
9916 | AO : constant Entity_Id := Alias (Old_E); | |
9917 | AN : constant Entity_Id := Alias (New_E); | |
9918 | ||
9919 | begin | |
9920 | return Scope (AO) /= Scope (AN) | |
9921 | or else No (DTC_Entity (AO)) | |
9922 | or else No (DTC_Entity (AN)) | |
9923 | or else DT_Position (AO) = DT_Position (AN); | |
9924 | end Is_Overriding_Alias; | |
9925 | ||
996ae0b0 RK |
9926 | -- Start of processing for New_Overloaded_Entity |
9927 | ||
9928 | begin | |
fbf5a39b AC |
9929 | -- We need to look for an entity that S may override. This must be a |
9930 | -- homonym in the current scope, so we look for the first homonym of | |
9931 | -- S in the current scope as the starting point for the search. | |
9932 | ||
9933 | E := Current_Entity_In_Scope (S); | |
9934 | ||
947430d5 AC |
9935 | -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
9936 | -- They are directly added to the list of primitive operations of | |
9937 | -- Derived_Type, unless this is a rederivation in the private part | |
9938 | -- of an operation that was already derived in the visible part of | |
9939 | -- the current package. | |
9940 | ||
0791fbe9 | 9941 | if Ada_Version >= Ada_2005 |
947430d5 AC |
9942 | and then Present (Derived_Type) |
9943 | and then Present (Alias (S)) | |
9944 | and then Is_Dispatching_Operation (Alias (S)) | |
9945 | and then Present (Find_Dispatching_Type (Alias (S))) | |
9946 | and then Is_Interface (Find_Dispatching_Type (Alias (S))) | |
9947 | then | |
9948 | -- For private types, when the full-view is processed we propagate to | |
9949 | -- the full view the non-overridden entities whose attribute "alias" | |
9950 | -- references an interface primitive. These entities were added by | |
9951 | -- Derive_Subprograms to ensure that interface primitives are | |
9952 | -- covered. | |
9953 | ||
9954 | -- Inside_Freeze_Actions is non zero when S corresponds with an | |
9955 | -- internal entity that links an interface primitive with its | |
9956 | -- covering primitive through attribute Interface_Alias (see | |
4adf3c50 | 9957 | -- Add_Internal_Interface_Entities). |
947430d5 AC |
9958 | |
9959 | if Inside_Freezing_Actions = 0 | |
9960 | and then Is_Package_Or_Generic_Package (Current_Scope) | |
9961 | and then In_Private_Part (Current_Scope) | |
9962 | and then Nkind (Parent (E)) = N_Private_Extension_Declaration | |
9963 | and then Nkind (Parent (S)) = N_Full_Type_Declaration | |
9964 | and then Full_View (Defining_Identifier (Parent (E))) | |
9965 | = Defining_Identifier (Parent (S)) | |
9966 | and then Alias (E) = Alias (S) | |
9967 | then | |
9968 | Check_Operation_From_Private_View (S, E); | |
9969 | Set_Is_Dispatching_Operation (S); | |
9970 | ||
9971 | -- Common case | |
9972 | ||
9973 | else | |
9974 | Enter_Overloaded_Entity (S); | |
9975 | Check_Dispatching_Operation (S, Empty); | |
9976 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); | |
9977 | end if; | |
9978 | ||
9979 | return; | |
9980 | end if; | |
9981 | ||
fbf5a39b AC |
9982 | -- If there is no homonym then this is definitely not overriding |
9983 | ||
996ae0b0 RK |
9984 | if No (E) then |
9985 | Enter_Overloaded_Entity (S); | |
9986 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 9987 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
996ae0b0 | 9988 | |
ec4867fa ES |
9989 | -- If subprogram has an explicit declaration, check whether it |
9990 | -- has an overriding indicator. | |
758c442c | 9991 | |
ec4867fa | 9992 | if Comes_From_Source (S) then |
8aa15e3b | 9993 | Check_Synchronized_Overriding (S, Overridden_Subp); |
ea034236 AC |
9994 | |
9995 | -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then | |
9996 | -- it may have overridden some hidden inherited primitive. Update | |
308e6f3a | 9997 | -- Overridden_Subp to avoid spurious errors when checking the |
ea034236 AC |
9998 | -- overriding indicator. |
9999 | ||
10000 | if Ada_Version >= Ada_2012 | |
10001 | and then No (Overridden_Subp) | |
10002 | and then Is_Dispatching_Operation (S) | |
038140ed | 10003 | and then Present (Overridden_Operation (S)) |
ea034236 AC |
10004 | then |
10005 | Overridden_Subp := Overridden_Operation (S); | |
10006 | end if; | |
10007 | ||
5d37ba92 ES |
10008 | Check_Overriding_Indicator |
10009 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
758c442c GD |
10010 | end if; |
10011 | ||
fbf5a39b AC |
10012 | -- If there is a homonym that is not overloadable, then we have an |
10013 | -- error, except for the special cases checked explicitly below. | |
10014 | ||
996ae0b0 RK |
10015 | elsif not Is_Overloadable (E) then |
10016 | ||
10017 | -- Check for spurious conflict produced by a subprogram that has the | |
10018 | -- same name as that of the enclosing generic package. The conflict | |
10019 | -- occurs within an instance, between the subprogram and the renaming | |
10020 | -- declaration for the package. After the subprogram, the package | |
10021 | -- renaming declaration becomes hidden. | |
10022 | ||
10023 | if Ekind (E) = E_Package | |
10024 | and then Present (Renamed_Object (E)) | |
10025 | and then Renamed_Object (E) = Current_Scope | |
10026 | and then Nkind (Parent (Renamed_Object (E))) = | |
10027 | N_Package_Specification | |
10028 | and then Present (Generic_Parent (Parent (Renamed_Object (E)))) | |
10029 | then | |
10030 | Set_Is_Hidden (E); | |
10031 | Set_Is_Immediately_Visible (E, False); | |
10032 | Enter_Overloaded_Entity (S); | |
10033 | Set_Homonym (S, Homonym (E)); | |
10034 | Check_Dispatching_Operation (S, Empty); | |
5d37ba92 | 10035 | Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
996ae0b0 RK |
10036 | |
10037 | -- If the subprogram is implicit it is hidden by the previous | |
82c80734 RD |
10038 | -- declaration. However if it is dispatching, it must appear in the |
10039 | -- dispatch table anyway, because it can be dispatched to even if it | |
10040 | -- cannot be called directly. | |
996ae0b0 | 10041 | |
4adf3c50 | 10042 | elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
996ae0b0 RK |
10043 | Set_Scope (S, Current_Scope); |
10044 | ||
10045 | if Is_Dispatching_Operation (Alias (S)) then | |
10046 | Check_Dispatching_Operation (S, Empty); | |
10047 | end if; | |
10048 | ||
10049 | return; | |
10050 | ||
10051 | else | |
10052 | Error_Msg_Sloc := Sloc (E); | |
996ae0b0 | 10053 | |
f3d57416 | 10054 | -- Generate message, with useful additional warning if in generic |
996ae0b0 RK |
10055 | |
10056 | if Is_Generic_Unit (E) then | |
5d37ba92 ES |
10057 | Error_Msg_N ("previous generic unit cannot be overloaded", S); |
10058 | Error_Msg_N ("\& conflicts with declaration#", S); | |
10059 | else | |
10060 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
10061 | end if; |
10062 | ||
10063 | return; | |
10064 | end if; | |
10065 | ||
fbf5a39b AC |
10066 | -- E exists and is overloadable |
10067 | ||
996ae0b0 | 10068 | else |
8aa15e3b | 10069 | Check_Synchronized_Overriding (S, Overridden_Subp); |
758c442c | 10070 | |
82c80734 RD |
10071 | -- Loop through E and its homonyms to determine if any of them is |
10072 | -- the candidate for overriding by S. | |
996ae0b0 RK |
10073 | |
10074 | while Present (E) loop | |
fbf5a39b AC |
10075 | |
10076 | -- Definitely not interesting if not in the current scope | |
10077 | ||
996ae0b0 RK |
10078 | if Scope (E) /= Current_Scope then |
10079 | null; | |
10080 | ||
25ebc085 AC |
10081 | -- Ada 2012 (AI05-0165): For internally generated bodies of |
10082 | -- null procedures locate the internally generated spec. We | |
10083 | -- enforce mode conformance since a tagged type may inherit | |
10084 | -- from interfaces several null primitives which differ only | |
10085 | -- in the mode of the formals. | |
10086 | ||
10087 | elsif not Comes_From_Source (S) | |
10088 | and then Is_Null_Procedure (S) | |
10089 | and then not Mode_Conformant (E, S) | |
10090 | then | |
10091 | null; | |
10092 | ||
fbf5a39b AC |
10093 | -- Check if we have type conformance |
10094 | ||
ec4867fa | 10095 | elsif Type_Conformant (E, S) then |
c8ef728f | 10096 | |
82c80734 RD |
10097 | -- If the old and new entities have the same profile and one |
10098 | -- is not the body of the other, then this is an error, unless | |
10099 | -- one of them is implicitly declared. | |
996ae0b0 RK |
10100 | |
10101 | -- There are some cases when both can be implicit, for example | |
10102 | -- when both a literal and a function that overrides it are | |
f3d57416 | 10103 | -- inherited in a derivation, or when an inherited operation |
ec4867fa | 10104 | -- of a tagged full type overrides the inherited operation of |
f3d57416 | 10105 | -- a private extension. Ada 83 had a special rule for the |
885c4871 | 10106 | -- literal case. In Ada 95, the later implicit operation hides |
82c80734 RD |
10107 | -- the former, and the literal is always the former. In the |
10108 | -- odd case where both are derived operations declared at the | |
10109 | -- same point, both operations should be declared, and in that | |
10110 | -- case we bypass the following test and proceed to the next | |
df46b832 AC |
10111 | -- part. This can only occur for certain obscure cases in |
10112 | -- instances, when an operation on a type derived from a formal | |
10113 | -- private type does not override a homograph inherited from | |
10114 | -- the actual. In subsequent derivations of such a type, the | |
10115 | -- DT positions of these operations remain distinct, if they | |
10116 | -- have been set. | |
996ae0b0 RK |
10117 | |
10118 | if Present (Alias (S)) | |
10119 | and then (No (Alias (E)) | |
10120 | or else Comes_From_Source (E) | |
2ddc2000 | 10121 | or else Is_Abstract_Subprogram (S) |
df46b832 AC |
10122 | or else |
10123 | (Is_Dispatching_Operation (E) | |
2ddc2000 | 10124 | and then Is_Overriding_Alias (E, S))) |
df46b832 | 10125 | and then Ekind (E) /= E_Enumeration_Literal |
996ae0b0 | 10126 | then |
82c80734 RD |
10127 | -- When an derived operation is overloaded it may be due to |
10128 | -- the fact that the full view of a private extension | |
996ae0b0 RK |
10129 | -- re-inherits. It has to be dealt with. |
10130 | ||
e660dbf7 | 10131 | if Is_Package_Or_Generic_Package (Current_Scope) |
996ae0b0 RK |
10132 | and then In_Private_Part (Current_Scope) |
10133 | then | |
10134 | Check_Operation_From_Private_View (S, E); | |
10135 | end if; | |
10136 | ||
038140ed AC |
10137 | -- In any case the implicit operation remains hidden by the |
10138 | -- existing declaration, which is overriding. Indicate that | |
10139 | -- E overrides the operation from which S is inherited. | |
996ae0b0 | 10140 | |
038140ed AC |
10141 | if Present (Alias (S)) then |
10142 | Set_Overridden_Operation (E, Alias (S)); | |
10143 | else | |
10144 | Set_Overridden_Operation (E, S); | |
10145 | end if; | |
758c442c GD |
10146 | |
10147 | if Comes_From_Source (E) then | |
5d37ba92 | 10148 | Check_Overriding_Indicator (E, S, Is_Primitive => False); |
758c442c GD |
10149 | end if; |
10150 | ||
996ae0b0 RK |
10151 | return; |
10152 | ||
26a43556 AC |
10153 | -- Within an instance, the renaming declarations for actual |
10154 | -- subprograms may become ambiguous, but they do not hide each | |
10155 | -- other. | |
996ae0b0 RK |
10156 | |
10157 | elsif Ekind (E) /= E_Entry | |
10158 | and then not Comes_From_Source (E) | |
10159 | and then not Is_Generic_Instance (E) | |
10160 | and then (Present (Alias (E)) | |
10161 | or else Is_Intrinsic_Subprogram (E)) | |
10162 | and then (not In_Instance | |
10163 | or else No (Parent (E)) | |
10164 | or else Nkind (Unit_Declaration_Node (E)) /= | |
8dbd1460 | 10165 | N_Subprogram_Renaming_Declaration) |
996ae0b0 | 10166 | then |
26a43556 AC |
10167 | -- A subprogram child unit is not allowed to override an |
10168 | -- inherited subprogram (10.1.1(20)). | |
996ae0b0 RK |
10169 | |
10170 | if Is_Child_Unit (S) then | |
10171 | Error_Msg_N | |
10172 | ("child unit overrides inherited subprogram in parent", | |
10173 | S); | |
10174 | return; | |
10175 | end if; | |
10176 | ||
10177 | if Is_Non_Overriding_Operation (E, S) then | |
10178 | Enter_Overloaded_Entity (S); | |
8dbd1460 | 10179 | |
c8ef728f | 10180 | if No (Derived_Type) |
996ae0b0 RK |
10181 | or else Is_Tagged_Type (Derived_Type) |
10182 | then | |
10183 | Check_Dispatching_Operation (S, Empty); | |
10184 | end if; | |
10185 | ||
10186 | return; | |
10187 | end if; | |
10188 | ||
10189 | -- E is a derived operation or an internal operator which | |
10190 | -- is being overridden. Remove E from further visibility. | |
10191 | -- Furthermore, if E is a dispatching operation, it must be | |
10192 | -- replaced in the list of primitive operations of its type | |
10193 | -- (see Override_Dispatching_Operation). | |
10194 | ||
ec4867fa | 10195 | Overridden_Subp := E; |
758c442c | 10196 | |
996ae0b0 RK |
10197 | declare |
10198 | Prev : Entity_Id; | |
10199 | ||
10200 | begin | |
10201 | Prev := First_Entity (Current_Scope); | |
996ae0b0 RK |
10202 | while Present (Prev) |
10203 | and then Next_Entity (Prev) /= E | |
10204 | loop | |
10205 | Next_Entity (Prev); | |
10206 | end loop; | |
10207 | ||
10208 | -- It is possible for E to be in the current scope and | |
10209 | -- yet not in the entity chain. This can only occur in a | |
10210 | -- generic context where E is an implicit concatenation | |
10211 | -- in the formal part, because in a generic body the | |
10212 | -- entity chain starts with the formals. | |
10213 | ||
10214 | pragma Assert | |
10215 | (Present (Prev) or else Chars (E) = Name_Op_Concat); | |
10216 | ||
10217 | -- E must be removed both from the entity_list of the | |
10218 | -- current scope, and from the visibility chain | |
10219 | ||
10220 | if Debug_Flag_E then | |
10221 | Write_Str ("Override implicit operation "); | |
10222 | Write_Int (Int (E)); | |
10223 | Write_Eol; | |
10224 | end if; | |
10225 | ||
10226 | -- If E is a predefined concatenation, it stands for four | |
10227 | -- different operations. As a result, a single explicit | |
10228 | -- declaration does not hide it. In a possible ambiguous | |
10229 | -- situation, Disambiguate chooses the user-defined op, | |
10230 | -- so it is correct to retain the previous internal one. | |
10231 | ||
10232 | if Chars (E) /= Name_Op_Concat | |
10233 | or else Ekind (E) /= E_Operator | |
10234 | then | |
10235 | -- For nondispatching derived operations that are | |
10236 | -- overridden by a subprogram declared in the private | |
8dbd1460 AC |
10237 | -- part of a package, we retain the derived subprogram |
10238 | -- but mark it as not immediately visible. If the | |
10239 | -- derived operation was declared in the visible part | |
10240 | -- then this ensures that it will still be visible | |
10241 | -- outside the package with the proper signature | |
10242 | -- (calls from outside must also be directed to this | |
10243 | -- version rather than the overriding one, unlike the | |
10244 | -- dispatching case). Calls from inside the package | |
10245 | -- will still resolve to the overriding subprogram | |
10246 | -- since the derived one is marked as not visible | |
10247 | -- within the package. | |
996ae0b0 RK |
10248 | |
10249 | -- If the private operation is dispatching, we achieve | |
10250 | -- the overriding by keeping the implicit operation | |
9865d858 | 10251 | -- but setting its alias to be the overriding one. In |
996ae0b0 RK |
10252 | -- this fashion the proper body is executed in all |
10253 | -- cases, but the original signature is used outside | |
10254 | -- of the package. | |
10255 | ||
10256 | -- If the overriding is not in the private part, we | |
10257 | -- remove the implicit operation altogether. | |
10258 | ||
10259 | if Is_Private_Declaration (S) then | |
996ae0b0 RK |
10260 | if not Is_Dispatching_Operation (E) then |
10261 | Set_Is_Immediately_Visible (E, False); | |
10262 | else | |
e895b435 | 10263 | -- Work done in Override_Dispatching_Operation, |
a46cde68 | 10264 | -- so nothing else needs to be done here. |
996ae0b0 RK |
10265 | |
10266 | null; | |
10267 | end if; | |
996ae0b0 | 10268 | |
fbf5a39b AC |
10269 | else |
10270 | -- Find predecessor of E in Homonym chain | |
996ae0b0 RK |
10271 | |
10272 | if E = Current_Entity (E) then | |
10273 | Prev_Vis := Empty; | |
10274 | else | |
10275 | Prev_Vis := Current_Entity (E); | |
10276 | while Homonym (Prev_Vis) /= E loop | |
10277 | Prev_Vis := Homonym (Prev_Vis); | |
10278 | end loop; | |
10279 | end if; | |
10280 | ||
10281 | if Prev_Vis /= Empty then | |
10282 | ||
10283 | -- Skip E in the visibility chain | |
10284 | ||
10285 | Set_Homonym (Prev_Vis, Homonym (E)); | |
10286 | ||
10287 | else | |
10288 | Set_Name_Entity_Id (Chars (E), Homonym (E)); | |
10289 | end if; | |
10290 | ||
10291 | Set_Next_Entity (Prev, Next_Entity (E)); | |
10292 | ||
10293 | if No (Next_Entity (Prev)) then | |
10294 | Set_Last_Entity (Current_Scope, Prev); | |
10295 | end if; | |
996ae0b0 RK |
10296 | end if; |
10297 | end if; | |
10298 | ||
10299 | Enter_Overloaded_Entity (S); | |
1c1289e7 AC |
10300 | |
10301 | -- For entities generated by Derive_Subprograms the | |
10302 | -- overridden operation is the inherited primitive | |
10303 | -- (which is available through the attribute alias). | |
10304 | ||
10305 | if not (Comes_From_Source (E)) | |
10306 | and then Is_Dispatching_Operation (E) | |
f9673bb0 AC |
10307 | and then Find_Dispatching_Type (E) = |
10308 | Find_Dispatching_Type (S) | |
1c1289e7 AC |
10309 | and then Present (Alias (E)) |
10310 | and then Comes_From_Source (Alias (E)) | |
10311 | then | |
10312 | Set_Overridden_Operation (S, Alias (E)); | |
2fe829ae | 10313 | |
6320f5e1 AC |
10314 | -- Normal case of setting entity as overridden |
10315 | ||
10316 | -- Note: Static_Initialization and Overridden_Operation | |
10317 | -- attributes use the same field in subprogram entities. | |
10318 | -- Static_Initialization is only defined for internal | |
10319 | -- initialization procedures, where Overridden_Operation | |
10320 | -- is irrelevant. Therefore the setting of this attribute | |
10321 | -- must check whether the target is an init_proc. | |
10322 | ||
2fe829ae | 10323 | elsif not Is_Init_Proc (S) then |
1c1289e7 AC |
10324 | Set_Overridden_Operation (S, E); |
10325 | end if; | |
10326 | ||
5d37ba92 | 10327 | Check_Overriding_Indicator (S, E, Is_Primitive => True); |
996ae0b0 | 10328 | |
fc53fe76 | 10329 | -- If S is a user-defined subprogram or a null procedure |
38ef8ebe AC |
10330 | -- expanded to override an inherited null procedure, or a |
10331 | -- predefined dispatching primitive then indicate that E | |
038140ed | 10332 | -- overrides the operation from which S is inherited. |
fc53fe76 AC |
10333 | |
10334 | if Comes_From_Source (S) | |
10335 | or else | |
10336 | (Present (Parent (S)) | |
10337 | and then | |
10338 | Nkind (Parent (S)) = N_Procedure_Specification | |
10339 | and then | |
10340 | Null_Present (Parent (S))) | |
38ef8ebe AC |
10341 | or else |
10342 | (Present (Alias (E)) | |
f16e8df9 RD |
10343 | and then |
10344 | Is_Predefined_Dispatching_Operation (Alias (E))) | |
fc53fe76 | 10345 | then |
c8ef728f | 10346 | if Present (Alias (E)) then |
41251c60 | 10347 | Set_Overridden_Operation (S, Alias (E)); |
41251c60 JM |
10348 | end if; |
10349 | end if; | |
10350 | ||
996ae0b0 | 10351 | if Is_Dispatching_Operation (E) then |
fbf5a39b | 10352 | |
82c80734 | 10353 | -- An overriding dispatching subprogram inherits the |
f9673bb0 | 10354 | -- convention of the overridden subprogram (AI-117). |
996ae0b0 RK |
10355 | |
10356 | Set_Convention (S, Convention (E)); | |
41251c60 JM |
10357 | Check_Dispatching_Operation (S, E); |
10358 | ||
996ae0b0 RK |
10359 | else |
10360 | Check_Dispatching_Operation (S, Empty); | |
10361 | end if; | |
10362 | ||
5d37ba92 ES |
10363 | Check_For_Primitive_Subprogram |
10364 | (Is_Primitive_Subp, Is_Overriding => True); | |
996ae0b0 RK |
10365 | goto Check_Inequality; |
10366 | end; | |
10367 | ||
10368 | -- Apparent redeclarations in instances can occur when two | |
10369 | -- formal types get the same actual type. The subprograms in | |
10370 | -- in the instance are legal, even if not callable from the | |
10371 | -- outside. Calls from within are disambiguated elsewhere. | |
10372 | -- For dispatching operations in the visible part, the usual | |
10373 | -- rules apply, and operations with the same profile are not | |
10374 | -- legal (B830001). | |
10375 | ||
10376 | elsif (In_Instance_Visible_Part | |
10377 | and then not Is_Dispatching_Operation (E)) | |
10378 | or else In_Instance_Not_Visible | |
10379 | then | |
10380 | null; | |
10381 | ||
10382 | -- Here we have a real error (identical profile) | |
10383 | ||
10384 | else | |
10385 | Error_Msg_Sloc := Sloc (E); | |
10386 | ||
10387 | -- Avoid cascaded errors if the entity appears in | |
10388 | -- subsequent calls. | |
10389 | ||
10390 | Set_Scope (S, Current_Scope); | |
10391 | ||
5d37ba92 ES |
10392 | -- Generate error, with extra useful warning for the case |
10393 | -- of a generic instance with no completion. | |
996ae0b0 RK |
10394 | |
10395 | if Is_Generic_Instance (S) | |
10396 | and then not Has_Completion (E) | |
10397 | then | |
10398 | Error_Msg_N | |
5d37ba92 ES |
10399 | ("instantiation cannot provide body for&", S); |
10400 | Error_Msg_N ("\& conflicts with declaration#", S); | |
10401 | else | |
10402 | Error_Msg_N ("& conflicts with declaration#", S); | |
996ae0b0 RK |
10403 | end if; |
10404 | ||
10405 | return; | |
10406 | end if; | |
10407 | ||
10408 | else | |
c8ef728f ES |
10409 | -- If one subprogram has an access parameter and the other |
10410 | -- a parameter of an access type, calls to either might be | |
10411 | -- ambiguous. Verify that parameters match except for the | |
10412 | -- access parameter. | |
10413 | ||
10414 | if May_Hide_Profile then | |
10415 | declare | |
ec4867fa ES |
10416 | F1 : Entity_Id; |
10417 | F2 : Entity_Id; | |
8dbd1460 | 10418 | |
c8ef728f ES |
10419 | begin |
10420 | F1 := First_Formal (S); | |
10421 | F2 := First_Formal (E); | |
10422 | while Present (F1) and then Present (F2) loop | |
10423 | if Is_Access_Type (Etype (F1)) then | |
10424 | if not Is_Access_Type (Etype (F2)) | |
10425 | or else not Conforming_Types | |
10426 | (Designated_Type (Etype (F1)), | |
10427 | Designated_Type (Etype (F2)), | |
10428 | Type_Conformant) | |
10429 | then | |
10430 | May_Hide_Profile := False; | |
10431 | end if; | |
10432 | ||
10433 | elsif | |
10434 | not Conforming_Types | |
10435 | (Etype (F1), Etype (F2), Type_Conformant) | |
10436 | then | |
10437 | May_Hide_Profile := False; | |
10438 | end if; | |
10439 | ||
10440 | Next_Formal (F1); | |
10441 | Next_Formal (F2); | |
10442 | end loop; | |
10443 | ||
10444 | if May_Hide_Profile | |
10445 | and then No (F1) | |
10446 | and then No (F2) | |
10447 | then | |
10448 | Error_Msg_NE ("calls to& may be ambiguous?", S, S); | |
10449 | end if; | |
10450 | end; | |
10451 | end if; | |
996ae0b0 RK |
10452 | end if; |
10453 | ||
996ae0b0 RK |
10454 | E := Homonym (E); |
10455 | end loop; | |
10456 | ||
10457 | -- On exit, we know that S is a new entity | |
10458 | ||
10459 | Enter_Overloaded_Entity (S); | |
5d37ba92 ES |
10460 | Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
10461 | Check_Overriding_Indicator | |
10462 | (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); | |
996ae0b0 | 10463 | |
c4d67e2d | 10464 | -- Overloading is not allowed in SPARK, except for operators |
8ed68165 | 10465 | |
c4d67e2d AC |
10466 | if Nkind (S) /= N_Defining_Operator_Symbol then |
10467 | Error_Msg_Sloc := Sloc (Homonym (S)); | |
10468 | Check_SPARK_Restriction | |
10469 | ("overloading not allowed with entity#", S); | |
10470 | end if; | |
8ed68165 | 10471 | |
82c80734 RD |
10472 | -- If S is a derived operation for an untagged type then by |
10473 | -- definition it's not a dispatching operation (even if the parent | |
e917aec2 RD |
10474 | -- operation was dispatching), so Check_Dispatching_Operation is not |
10475 | -- called in that case. | |
996ae0b0 | 10476 | |
c8ef728f | 10477 | if No (Derived_Type) |
996ae0b0 RK |
10478 | or else Is_Tagged_Type (Derived_Type) |
10479 | then | |
10480 | Check_Dispatching_Operation (S, Empty); | |
10481 | end if; | |
10482 | end if; | |
10483 | ||
82c80734 RD |
10484 | -- If this is a user-defined equality operator that is not a derived |
10485 | -- subprogram, create the corresponding inequality. If the operation is | |
10486 | -- dispatching, the expansion is done elsewhere, and we do not create | |
10487 | -- an explicit inequality operation. | |
996ae0b0 RK |
10488 | |
10489 | <<Check_Inequality>> | |
10490 | if Chars (S) = Name_Op_Eq | |
10491 | and then Etype (S) = Standard_Boolean | |
10492 | and then Present (Parent (S)) | |
10493 | and then not Is_Dispatching_Operation (S) | |
10494 | then | |
10495 | Make_Inequality_Operator (S); | |
d151d6a3 | 10496 | |
dbe945f1 | 10497 | if Ada_Version >= Ada_2012 then |
e5a58fac AC |
10498 | Check_Untagged_Equality (S); |
10499 | end if; | |
996ae0b0 | 10500 | end if; |
996ae0b0 RK |
10501 | end New_Overloaded_Entity; |
10502 | ||
10503 | --------------------- | |
10504 | -- Process_Formals -- | |
10505 | --------------------- | |
10506 | ||
10507 | procedure Process_Formals | |
07fc65c4 | 10508 | (T : List_Id; |
996ae0b0 RK |
10509 | Related_Nod : Node_Id) |
10510 | is | |
10511 | Param_Spec : Node_Id; | |
10512 | Formal : Entity_Id; | |
10513 | Formal_Type : Entity_Id; | |
10514 | Default : Node_Id; | |
10515 | Ptype : Entity_Id; | |
10516 | ||
800621e0 RD |
10517 | Num_Out_Params : Nat := 0; |
10518 | First_Out_Param : Entity_Id := Empty; | |
21d27997 | 10519 | -- Used for setting Is_Only_Out_Parameter |
800621e0 | 10520 | |
950d217a AC |
10521 | function Designates_From_With_Type (Typ : Entity_Id) return Boolean; |
10522 | -- Determine whether an access type designates a type coming from a | |
10523 | -- limited view. | |
10524 | ||
07fc65c4 | 10525 | function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
82c80734 RD |
10526 | -- Check whether the default has a class-wide type. After analysis the |
10527 | -- default has the type of the formal, so we must also check explicitly | |
10528 | -- for an access attribute. | |
07fc65c4 | 10529 | |
950d217a AC |
10530 | ------------------------------- |
10531 | -- Designates_From_With_Type -- | |
10532 | ------------------------------- | |
10533 | ||
10534 | function Designates_From_With_Type (Typ : Entity_Id) return Boolean is | |
10535 | Desig : Entity_Id := Typ; | |
10536 | ||
10537 | begin | |
10538 | if Is_Access_Type (Desig) then | |
10539 | Desig := Directly_Designated_Type (Desig); | |
10540 | end if; | |
10541 | ||
10542 | if Is_Class_Wide_Type (Desig) then | |
10543 | Desig := Root_Type (Desig); | |
10544 | end if; | |
10545 | ||
10546 | return | |
10547 | Ekind (Desig) = E_Incomplete_Type | |
10548 | and then From_With_Type (Desig); | |
10549 | end Designates_From_With_Type; | |
10550 | ||
07fc65c4 GB |
10551 | --------------------------- |
10552 | -- Is_Class_Wide_Default -- | |
10553 | --------------------------- | |
10554 | ||
10555 | function Is_Class_Wide_Default (D : Node_Id) return Boolean is | |
10556 | begin | |
10557 | return Is_Class_Wide_Type (Designated_Type (Etype (D))) | |
10558 | or else (Nkind (D) = N_Attribute_Reference | |
0f853035 YM |
10559 | and then Attribute_Name (D) = Name_Access |
10560 | and then Is_Class_Wide_Type (Etype (Prefix (D)))); | |
07fc65c4 GB |
10561 | end Is_Class_Wide_Default; |
10562 | ||
10563 | -- Start of processing for Process_Formals | |
10564 | ||
996ae0b0 RK |
10565 | begin |
10566 | -- In order to prevent premature use of the formals in the same formal | |
10567 | -- part, the Ekind is left undefined until all default expressions are | |
10568 | -- analyzed. The Ekind is established in a separate loop at the end. | |
10569 | ||
10570 | Param_Spec := First (T); | |
996ae0b0 | 10571 | while Present (Param_Spec) loop |
996ae0b0 | 10572 | Formal := Defining_Identifier (Param_Spec); |
5d37ba92 | 10573 | Set_Never_Set_In_Source (Formal, True); |
996ae0b0 RK |
10574 | Enter_Name (Formal); |
10575 | ||
10576 | -- Case of ordinary parameters | |
10577 | ||
10578 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
10579 | Find_Type (Parameter_Type (Param_Spec)); | |
10580 | Ptype := Parameter_Type (Param_Spec); | |
10581 | ||
10582 | if Ptype = Error then | |
10583 | goto Continue; | |
10584 | end if; | |
10585 | ||
10586 | Formal_Type := Entity (Ptype); | |
10587 | ||
ec4867fa ES |
10588 | if Is_Incomplete_Type (Formal_Type) |
10589 | or else | |
10590 | (Is_Class_Wide_Type (Formal_Type) | |
10591 | and then Is_Incomplete_Type (Root_Type (Formal_Type))) | |
996ae0b0 | 10592 | then |
93bcda23 AC |
10593 | -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
10594 | -- primitive operations, as long as their completion is | |
10595 | -- in the same declarative part. If in the private part | |
10596 | -- this means that the type cannot be a Taft-amendment type. | |
cec29135 ES |
10597 | -- Check is done on package exit. For access to subprograms, |
10598 | -- the use is legal for Taft-amendment types. | |
fbf5a39b | 10599 | |
6eddd7b4 AC |
10600 | -- Ada 2012: tagged incomplete types are allowed as generic |
10601 | -- formal types. They do not introduce dependencies and the | |
10602 | -- corresponding generic subprogram does not have a delayed | |
10603 | -- freeze, because it does not need a freeze node. | |
10604 | ||
d8db0bca | 10605 | if Is_Tagged_Type (Formal_Type) then |
93bcda23 | 10606 | if Ekind (Scope (Current_Scope)) = E_Package |
93bcda23 | 10607 | and then not From_With_Type (Formal_Type) |
6eddd7b4 | 10608 | and then not Is_Generic_Type (Formal_Type) |
93bcda23 AC |
10609 | and then not Is_Class_Wide_Type (Formal_Type) |
10610 | then | |
cec29135 ES |
10611 | if not Nkind_In |
10612 | (Parent (T), N_Access_Function_Definition, | |
10613 | N_Access_Procedure_Definition) | |
10614 | then | |
10615 | Append_Elmt | |
10616 | (Current_Scope, | |
10617 | Private_Dependents (Base_Type (Formal_Type))); | |
4637729f AC |
10618 | |
10619 | -- Freezing is delayed to ensure that Register_Prim | |
10620 | -- will get called for this operation, which is needed | |
10621 | -- in cases where static dispatch tables aren't built. | |
10622 | -- (Note that the same is done for controlling access | |
10623 | -- parameter cases in function Access_Definition.) | |
10624 | ||
10625 | Set_Has_Delayed_Freeze (Current_Scope); | |
cec29135 | 10626 | end if; |
93bcda23 | 10627 | end if; |
fbf5a39b | 10628 | |
0a36105d JM |
10629 | -- Special handling of Value_Type for CIL case |
10630 | ||
10631 | elsif Is_Value_Type (Formal_Type) then | |
10632 | null; | |
10633 | ||
800621e0 RD |
10634 | elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
10635 | N_Access_Procedure_Definition) | |
996ae0b0 | 10636 | then |
dd386db0 AC |
10637 | -- AI05-0151: Tagged incomplete types are allowed in all |
10638 | -- formal parts. Untagged incomplete types are not allowed | |
10639 | -- in bodies. | |
10640 | ||
10641 | if Ada_Version >= Ada_2012 then | |
10642 | if Is_Tagged_Type (Formal_Type) then | |
10643 | null; | |
10644 | ||
0f1a6a0b AC |
10645 | elsif Nkind_In (Parent (Parent (T)), N_Accept_Statement, |
10646 | N_Entry_Body, | |
10647 | N_Subprogram_Body) | |
dd386db0 AC |
10648 | then |
10649 | Error_Msg_NE | |
10650 | ("invalid use of untagged incomplete type&", | |
0f1a6a0b | 10651 | Ptype, Formal_Type); |
dd386db0 AC |
10652 | end if; |
10653 | ||
10654 | else | |
10655 | Error_Msg_NE | |
10656 | ("invalid use of incomplete type&", | |
0f1a6a0b | 10657 | Param_Spec, Formal_Type); |
dd386db0 AC |
10658 | |
10659 | -- Further checks on the legality of incomplete types | |
10660 | -- in formal parts are delayed until the freeze point | |
10661 | -- of the enclosing subprogram or access to subprogram. | |
10662 | end if; | |
996ae0b0 RK |
10663 | end if; |
10664 | ||
10665 | elsif Ekind (Formal_Type) = E_Void then | |
0f1a6a0b AC |
10666 | Error_Msg_NE |
10667 | ("premature use of&", | |
10668 | Parameter_Type (Param_Spec), Formal_Type); | |
996ae0b0 RK |
10669 | end if; |
10670 | ||
fecbd779 AC |
10671 | -- Ada 2012 (AI-142): Handle aliased parameters |
10672 | ||
10673 | if Ada_Version >= Ada_2012 | |
10674 | and then Aliased_Present (Param_Spec) | |
10675 | then | |
10676 | Set_Is_Aliased (Formal); | |
10677 | end if; | |
10678 | ||
0ab80019 | 10679 | -- Ada 2005 (AI-231): Create and decorate an internal subtype |
7324bf49 | 10680 | -- declaration corresponding to the null-excluding type of the |
d8db0bca JM |
10681 | -- formal in the enclosing scope. Finally, replace the parameter |
10682 | -- type of the formal with the internal subtype. | |
7324bf49 | 10683 | |
0791fbe9 | 10684 | if Ada_Version >= Ada_2005 |
41251c60 | 10685 | and then Null_Exclusion_Present (Param_Spec) |
7324bf49 | 10686 | then |
ec4867fa | 10687 | if not Is_Access_Type (Formal_Type) then |
ed2233dc | 10688 | Error_Msg_N |
0a36105d JM |
10689 | ("`NOT NULL` allowed only for an access type", Param_Spec); |
10690 | ||
ec4867fa ES |
10691 | else |
10692 | if Can_Never_Be_Null (Formal_Type) | |
10693 | and then Comes_From_Source (Related_Nod) | |
10694 | then | |
ed2233dc | 10695 | Error_Msg_NE |
0a36105d | 10696 | ("`NOT NULL` not allowed (& already excludes null)", |
0f1a6a0b | 10697 | Param_Spec, Formal_Type); |
ec4867fa | 10698 | end if; |
41251c60 | 10699 | |
ec4867fa ES |
10700 | Formal_Type := |
10701 | Create_Null_Excluding_Itype | |
10702 | (T => Formal_Type, | |
10703 | Related_Nod => Related_Nod, | |
10704 | Scope_Id => Scope (Current_Scope)); | |
0a36105d JM |
10705 | |
10706 | -- If the designated type of the itype is an itype we | |
10707 | -- decorate it with the Has_Delayed_Freeze attribute to | |
10708 | -- avoid problems with the backend. | |
10709 | ||
10710 | -- Example: | |
10711 | -- type T is access procedure; | |
10712 | -- procedure Op (O : not null T); | |
10713 | ||
10714 | if Is_Itype (Directly_Designated_Type (Formal_Type)) then | |
10715 | Set_Has_Delayed_Freeze (Formal_Type); | |
10716 | end if; | |
ec4867fa | 10717 | end if; |
7324bf49 AC |
10718 | end if; |
10719 | ||
996ae0b0 RK |
10720 | -- An access formal type |
10721 | ||
10722 | else | |
10723 | Formal_Type := | |
10724 | Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); | |
7324bf49 | 10725 | |
f937473f RD |
10726 | -- No need to continue if we already notified errors |
10727 | ||
10728 | if not Present (Formal_Type) then | |
10729 | return; | |
10730 | end if; | |
10731 | ||
0ab80019 | 10732 | -- Ada 2005 (AI-254) |
7324bf49 | 10733 | |
af4b9434 AC |
10734 | declare |
10735 | AD : constant Node_Id := | |
10736 | Access_To_Subprogram_Definition | |
10737 | (Parameter_Type (Param_Spec)); | |
10738 | begin | |
10739 | if Present (AD) and then Protected_Present (AD) then | |
10740 | Formal_Type := | |
10741 | Replace_Anonymous_Access_To_Protected_Subprogram | |
f937473f | 10742 | (Param_Spec); |
af4b9434 AC |
10743 | end if; |
10744 | end; | |
996ae0b0 RK |
10745 | end if; |
10746 | ||
10747 | Set_Etype (Formal, Formal_Type); | |
0f853035 | 10748 | |
fecbd779 AC |
10749 | -- Deal with default expression if present |
10750 | ||
fbf5a39b | 10751 | Default := Expression (Param_Spec); |
996ae0b0 RK |
10752 | |
10753 | if Present (Default) then | |
2ba431e5 | 10754 | Check_SPARK_Restriction |
fe5d3068 | 10755 | ("default expression is not allowed", Default); |
38171f43 | 10756 | |
996ae0b0 | 10757 | if Out_Present (Param_Spec) then |
ed2233dc | 10758 | Error_Msg_N |
996ae0b0 RK |
10759 | ("default initialization only allowed for IN parameters", |
10760 | Param_Spec); | |
10761 | end if; | |
10762 | ||
10763 | -- Do the special preanalysis of the expression (see section on | |
10764 | -- "Handling of Default Expressions" in the spec of package Sem). | |
10765 | ||
21d27997 | 10766 | Preanalyze_Spec_Expression (Default, Formal_Type); |
996ae0b0 | 10767 | |
f29b857f ES |
10768 | -- An access to constant cannot be the default for |
10769 | -- an access parameter that is an access to variable. | |
2eb160f2 ST |
10770 | |
10771 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
10772 | and then not Is_Access_Constant (Formal_Type) | |
10773 | and then Is_Access_Type (Etype (Default)) | |
10774 | and then Is_Access_Constant (Etype (Default)) | |
10775 | then | |
f29b857f ES |
10776 | Error_Msg_N |
10777 | ("formal that is access to variable cannot be initialized " & | |
10778 | "with an access-to-constant expression", Default); | |
2eb160f2 ST |
10779 | end if; |
10780 | ||
d8db0bca JM |
10781 | -- Check that the designated type of an access parameter's default |
10782 | -- is not a class-wide type unless the parameter's designated type | |
10783 | -- is also class-wide. | |
996ae0b0 RK |
10784 | |
10785 | if Ekind (Formal_Type) = E_Anonymous_Access_Type | |
950d217a | 10786 | and then not Designates_From_With_Type (Formal_Type) |
07fc65c4 | 10787 | and then Is_Class_Wide_Default (Default) |
996ae0b0 RK |
10788 | and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
10789 | then | |
07fc65c4 GB |
10790 | Error_Msg_N |
10791 | ("access to class-wide expression not allowed here", Default); | |
996ae0b0 | 10792 | end if; |
4755cce9 JM |
10793 | |
10794 | -- Check incorrect use of dynamically tagged expressions | |
10795 | ||
10796 | if Is_Tagged_Type (Formal_Type) then | |
10797 | Check_Dynamically_Tagged_Expression | |
10798 | (Expr => Default, | |
10799 | Typ => Formal_Type, | |
10800 | Related_Nod => Default); | |
10801 | end if; | |
996ae0b0 RK |
10802 | end if; |
10803 | ||
41251c60 JM |
10804 | -- Ada 2005 (AI-231): Static checks |
10805 | ||
0791fbe9 | 10806 | if Ada_Version >= Ada_2005 |
41251c60 JM |
10807 | and then Is_Access_Type (Etype (Formal)) |
10808 | and then Can_Never_Be_Null (Etype (Formal)) | |
10809 | then | |
10810 | Null_Exclusion_Static_Checks (Param_Spec); | |
10811 | end if; | |
10812 | ||
996ae0b0 RK |
10813 | <<Continue>> |
10814 | Next (Param_Spec); | |
10815 | end loop; | |
10816 | ||
82c80734 RD |
10817 | -- If this is the formal part of a function specification, analyze the |
10818 | -- subtype mark in the context where the formals are visible but not | |
10819 | -- yet usable, and may hide outer homographs. | |
10820 | ||
10821 | if Nkind (Related_Nod) = N_Function_Specification then | |
10822 | Analyze_Return_Type (Related_Nod); | |
10823 | end if; | |
10824 | ||
996ae0b0 RK |
10825 | -- Now set the kind (mode) of each formal |
10826 | ||
10827 | Param_Spec := First (T); | |
996ae0b0 RK |
10828 | while Present (Param_Spec) loop |
10829 | Formal := Defining_Identifier (Param_Spec); | |
10830 | Set_Formal_Mode (Formal); | |
10831 | ||
10832 | if Ekind (Formal) = E_In_Parameter then | |
10833 | Set_Default_Value (Formal, Expression (Param_Spec)); | |
10834 | ||
10835 | if Present (Expression (Param_Spec)) then | |
10836 | Default := Expression (Param_Spec); | |
10837 | ||
10838 | if Is_Scalar_Type (Etype (Default)) then | |
5ebfaacf AC |
10839 | if Nkind (Parameter_Type (Param_Spec)) /= |
10840 | N_Access_Definition | |
996ae0b0 RK |
10841 | then |
10842 | Formal_Type := Entity (Parameter_Type (Param_Spec)); | |
996ae0b0 | 10843 | else |
5ebfaacf AC |
10844 | Formal_Type := |
10845 | Access_Definition | |
10846 | (Related_Nod, Parameter_Type (Param_Spec)); | |
996ae0b0 RK |
10847 | end if; |
10848 | ||
10849 | Apply_Scalar_Range_Check (Default, Formal_Type); | |
10850 | end if; | |
2820d220 | 10851 | end if; |
800621e0 RD |
10852 | |
10853 | elsif Ekind (Formal) = E_Out_Parameter then | |
10854 | Num_Out_Params := Num_Out_Params + 1; | |
10855 | ||
10856 | if Num_Out_Params = 1 then | |
10857 | First_Out_Param := Formal; | |
10858 | end if; | |
10859 | ||
10860 | elsif Ekind (Formal) = E_In_Out_Parameter then | |
10861 | Num_Out_Params := Num_Out_Params + 1; | |
996ae0b0 RK |
10862 | end if; |
10863 | ||
4172a8e3 AC |
10864 | -- Skip remaining processing if formal type was in error |
10865 | ||
10866 | if Etype (Formal) = Any_Type or else Error_Posted (Formal) then | |
10867 | goto Next_Parameter; | |
10868 | end if; | |
10869 | ||
fecbd779 AC |
10870 | -- Force call by reference if aliased |
10871 | ||
10872 | if Is_Aliased (Formal) then | |
10873 | Set_Mechanism (Formal, By_Reference); | |
5ebfaacf AC |
10874 | |
10875 | -- Warn if user asked this to be passed by copy | |
10876 | ||
10877 | if Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10878 | Error_Msg_N | |
10879 | ("?cannot pass aliased parameter & by copy", Formal); | |
10880 | end if; | |
10881 | ||
10882 | -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy | |
10883 | ||
10884 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Copy then | |
10885 | Set_Mechanism (Formal, By_Copy); | |
10886 | ||
10887 | elsif Convention (Formal_Type) = Convention_Ada_Pass_By_Reference then | |
10888 | Set_Mechanism (Formal, By_Reference); | |
fecbd779 AC |
10889 | end if; |
10890 | ||
4172a8e3 | 10891 | <<Next_Parameter>> |
996ae0b0 RK |
10892 | Next (Param_Spec); |
10893 | end loop; | |
800621e0 RD |
10894 | |
10895 | if Present (First_Out_Param) and then Num_Out_Params = 1 then | |
10896 | Set_Is_Only_Out_Parameter (First_Out_Param); | |
10897 | end if; | |
996ae0b0 RK |
10898 | end Process_Formals; |
10899 | ||
21d27997 RD |
10900 | ------------------ |
10901 | -- Process_PPCs -- | |
10902 | ------------------ | |
10903 | ||
10904 | procedure Process_PPCs | |
10905 | (N : Node_Id; | |
10906 | Spec_Id : Entity_Id; | |
10907 | Body_Id : Entity_Id) | |
10908 | is | |
10909 | Loc : constant Source_Ptr := Sloc (N); | |
10910 | Prag : Node_Id; | |
21d27997 RD |
10911 | Parms : List_Id; |
10912 | ||
e606088a AC |
10913 | Designator : Entity_Id; |
10914 | -- Subprogram designator, set from Spec_Id if present, else Body_Id | |
10915 | ||
beacce02 AC |
10916 | Precond : Node_Id := Empty; |
10917 | -- Set non-Empty if we prepend precondition to the declarations. This | |
10918 | -- is used to hook up inherited preconditions (adding the condition | |
10919 | -- expression with OR ELSE, and adding the message). | |
10920 | ||
10921 | Inherited_Precond : Node_Id; | |
10922 | -- Precondition inherited from parent subprogram | |
10923 | ||
10924 | Inherited : constant Subprogram_List := | |
e606088a AC |
10925 | Inherited_Subprograms (Spec_Id); |
10926 | -- List of subprograms inherited by this subprogram | |
beacce02 AC |
10927 | |
10928 | Plist : List_Id := No_List; | |
10929 | -- List of generated postconditions | |
10930 | ||
f0709ca6 AC |
10931 | function Grab_PPC (Pspec : Entity_Id := Empty) return Node_Id; |
10932 | -- Prag contains an analyzed precondition or postcondition pragma. This | |
10933 | -- function copies the pragma, changes it to the corresponding Check | |
10934 | -- pragma and returns the Check pragma as the result. If Pspec is non- | |
10935 | -- empty, this is the case of inheriting a PPC, where we must change | |
10936 | -- references to parameters of the inherited subprogram to point to the | |
10937 | -- corresponding parameters of the current subprogram. | |
21d27997 | 10938 | |
b4ca2d2c AC |
10939 | function Invariants_Or_Predicates_Present return Boolean; |
10940 | -- Determines if any invariants or predicates are present for any OUT | |
10941 | -- or IN OUT parameters of the subprogram, or (for a function) if the | |
10942 | -- return value has an invariant. | |
e606088a | 10943 | |
a4901c08 AC |
10944 | function Is_Public_Subprogram_For (T : Entity_Id) return Boolean; |
10945 | -- T is the entity for a private type for which invariants are defined. | |
10946 | -- This function returns True if the procedure corresponding to the | |
10947 | -- value of Designator is a public procedure from the point of view of | |
10948 | -- this type (i.e. its spec is in the visible part of the package that | |
10949 | -- contains the declaration of the private type). A True value means | |
10950 | -- that an invariant check is required (for an IN OUT parameter, or | |
10951 | -- the returned value of a function. | |
10952 | ||
21d27997 RD |
10953 | -------------- |
10954 | -- Grab_PPC -- | |
10955 | -------------- | |
10956 | ||
f0709ca6 AC |
10957 | function Grab_PPC (Pspec : Entity_Id := Empty) return Node_Id is |
10958 | Nam : constant Name_Id := Pragma_Name (Prag); | |
10959 | Map : Elist_Id; | |
10960 | CP : Node_Id; | |
21d27997 RD |
10961 | |
10962 | begin | |
f0709ca6 AC |
10963 | -- Prepare map if this is the case where we have to map entities of |
10964 | -- arguments in the overridden subprogram to corresponding entities | |
10965 | -- of the current subprogram. | |
10966 | ||
10967 | if No (Pspec) then | |
10968 | Map := No_Elist; | |
10969 | ||
10970 | else | |
10971 | declare | |
10972 | PF : Entity_Id; | |
10973 | CF : Entity_Id; | |
10974 | ||
10975 | begin | |
10976 | Map := New_Elmt_List; | |
10977 | PF := First_Formal (Pspec); | |
e606088a | 10978 | CF := First_Formal (Designator); |
f0709ca6 AC |
10979 | while Present (PF) loop |
10980 | Append_Elmt (PF, Map); | |
10981 | Append_Elmt (CF, Map); | |
10982 | Next_Formal (PF); | |
10983 | Next_Formal (CF); | |
10984 | end loop; | |
10985 | end; | |
10986 | end if; | |
10987 | ||
308e6f3a | 10988 | -- Now we can copy the tree, doing any required substitutions |
f0709ca6 AC |
10989 | |
10990 | CP := New_Copy_Tree (Prag, Map => Map, New_Scope => Current_Scope); | |
10991 | ||
21d27997 RD |
10992 | -- Set Analyzed to false, since we want to reanalyze the check |
10993 | -- procedure. Note that it is only at the outer level that we | |
10994 | -- do this fiddling, for the spec cases, the already preanalyzed | |
10995 | -- parameters are not affected. | |
766d7add | 10996 | |
1fb00064 AC |
10997 | Set_Analyzed (CP, False); |
10998 | ||
10999 | -- We also make sure Comes_From_Source is False for the copy | |
11000 | ||
11001 | Set_Comes_From_Source (CP, False); | |
11002 | ||
0dabde3a ES |
11003 | -- For a postcondition pragma within a generic, preserve the pragma |
11004 | -- for later expansion. | |
21d27997 | 11005 | |
0dabde3a ES |
11006 | if Nam = Name_Postcondition |
11007 | and then not Expander_Active | |
11008 | then | |
11009 | return CP; | |
11010 | end if; | |
11011 | ||
1fb00064 | 11012 | -- Change copy of pragma into corresponding pragma Check |
21d27997 RD |
11013 | |
11014 | Prepend_To (Pragma_Argument_Associations (CP), | |
11015 | Make_Pragma_Argument_Association (Sloc (Prag), | |
7675ad4f AC |
11016 | Expression => Make_Identifier (Loc, Nam))); |
11017 | Set_Pragma_Identifier (CP, Make_Identifier (Sloc (Prag), Name_Check)); | |
21d27997 | 11018 | |
beacce02 AC |
11019 | -- If this is inherited case and the current message starts with |
11020 | -- "failed p", we change it to "failed inherited p...". | |
f0709ca6 AC |
11021 | |
11022 | if Present (Pspec) then | |
beacce02 AC |
11023 | declare |
11024 | Msg : constant Node_Id := | |
11025 | Last (Pragma_Argument_Associations (CP)); | |
11026 | ||
11027 | begin | |
11028 | if Chars (Msg) = Name_Message then | |
11029 | String_To_Name_Buffer (Strval (Expression (Msg))); | |
11030 | ||
11031 | if Name_Buffer (1 .. 8) = "failed p" then | |
11032 | Insert_Str_In_Name_Buffer ("inherited ", 8); | |
11033 | Set_Strval | |
11034 | (Expression (Last (Pragma_Argument_Associations (CP))), | |
11035 | String_From_Name_Buffer); | |
11036 | end if; | |
11037 | end if; | |
11038 | end; | |
f0709ca6 AC |
11039 | end if; |
11040 | ||
11041 | -- Return the check pragma | |
11042 | ||
21d27997 RD |
11043 | return CP; |
11044 | end Grab_PPC; | |
11045 | ||
b4ca2d2c AC |
11046 | -------------------------------------- |
11047 | -- Invariants_Or_Predicates_Present -- | |
11048 | -------------------------------------- | |
e606088a | 11049 | |
b4ca2d2c AC |
11050 | function Invariants_Or_Predicates_Present return Boolean is |
11051 | Formal : Entity_Id; | |
e606088a AC |
11052 | |
11053 | begin | |
11054 | -- Check function return result | |
11055 | ||
11056 | if Ekind (Designator) /= E_Procedure | |
11057 | and then Has_Invariants (Etype (Designator)) | |
11058 | then | |
11059 | return True; | |
11060 | end if; | |
11061 | ||
11062 | -- Check parameters | |
11063 | ||
11064 | Formal := First_Formal (Designator); | |
11065 | while Present (Formal) loop | |
11066 | if Ekind (Formal) /= E_In_Parameter | |
b4ca2d2c AC |
11067 | and then |
11068 | (Has_Invariants (Etype (Formal)) | |
11069 | or else Present (Predicate_Function (Etype (Formal)))) | |
e606088a AC |
11070 | then |
11071 | return True; | |
11072 | end if; | |
11073 | ||
11074 | Next_Formal (Formal); | |
11075 | end loop; | |
11076 | ||
11077 | return False; | |
b4ca2d2c | 11078 | end Invariants_Or_Predicates_Present; |
e606088a | 11079 | |
a4901c08 AC |
11080 | ------------------------------ |
11081 | -- Is_Public_Subprogram_For -- | |
11082 | ------------------------------ | |
11083 | ||
11084 | -- The type T is a private type, its declaration is therefore in | |
11085 | -- the list of public declarations of some package. The test for a | |
11086 | -- public subprogram is that its declaration is in this same list | |
11087 | -- of declarations for the same package (note that all the public | |
11088 | -- declarations are in one list, and all the private declarations | |
11089 | -- in another, so this deals with the public/private distinction). | |
11090 | ||
11091 | function Is_Public_Subprogram_For (T : Entity_Id) return Boolean is | |
11092 | DD : constant Node_Id := Unit_Declaration_Node (Designator); | |
11093 | -- The subprogram declaration for the subprogram in question | |
11094 | ||
11095 | TL : constant List_Id := | |
11096 | Visible_Declarations | |
11097 | (Specification (Unit_Declaration_Node (Scope (T)))); | |
11098 | -- The list of declarations containing the private declaration of | |
11099 | -- the type. We know it is a private type, so we know its scope is | |
11100 | -- the package in question, and we know it must be in the visible | |
11101 | -- declarations of this package. | |
11102 | ||
11103 | begin | |
11104 | -- If the subprogram declaration is not a list member, it must be | |
11105 | -- an Init_Proc, in which case we want to consider it to be a | |
11106 | -- public subprogram, since we do get initializations to deal with. | |
11107 | ||
11108 | if not Is_List_Member (DD) then | |
11109 | return True; | |
11110 | ||
11111 | -- Otherwise we test whether the subprogram is declared in the | |
11112 | -- visible declarations of the package containing the type. | |
11113 | ||
11114 | else | |
11115 | return TL = List_Containing (DD); | |
11116 | end if; | |
11117 | end Is_Public_Subprogram_For; | |
11118 | ||
21d27997 RD |
11119 | -- Start of processing for Process_PPCs |
11120 | ||
11121 | begin | |
e606088a AC |
11122 | -- Capture designator from spec if present, else from body |
11123 | ||
11124 | if Present (Spec_Id) then | |
11125 | Designator := Spec_Id; | |
11126 | else | |
11127 | Designator := Body_Id; | |
11128 | end if; | |
11129 | ||
62db841a | 11130 | -- Internally generated subprograms, such as type-specific functions, |
844ec038 | 11131 | -- don't get assertion checks. |
62db841a AC |
11132 | |
11133 | if Get_TSS_Name (Designator) /= TSS_Null then | |
11134 | return; | |
11135 | end if; | |
11136 | ||
21d27997 RD |
11137 | -- Grab preconditions from spec |
11138 | ||
11139 | if Present (Spec_Id) then | |
11140 | ||
11141 | -- Loop through PPC pragmas from spec. Note that preconditions from | |
11142 | -- the body will be analyzed and converted when we scan the body | |
11143 | -- declarations below. | |
11144 | ||
dac3bede | 11145 | Prag := Spec_PPC_List (Contract (Spec_Id)); |
21d27997 | 11146 | while Present (Prag) loop |
1fb00064 AC |
11147 | if Pragma_Name (Prag) = Name_Precondition then |
11148 | ||
beacce02 AC |
11149 | -- For Pre (or Precondition pragma), we simply prepend the |
11150 | -- pragma to the list of declarations right away so that it | |
11151 | -- will be executed at the start of the procedure. Note that | |
11152 | -- this processing reverses the order of the list, which is | |
11153 | -- what we want since new entries were chained to the head of | |
2d395256 AC |
11154 | -- the list. There can be more than one precondition when we |
11155 | -- use pragma Precondition. | |
beacce02 AC |
11156 | |
11157 | if not Class_Present (Prag) then | |
11158 | Prepend (Grab_PPC, Declarations (N)); | |
11159 | ||
11160 | -- For Pre'Class there can only be one pragma, and we save | |
11161 | -- it in Precond for now. We will add inherited Pre'Class | |
11162 | -- stuff before inserting this pragma in the declarations. | |
11163 | else | |
11164 | Precond := Grab_PPC; | |
11165 | end if; | |
21d27997 RD |
11166 | end if; |
11167 | ||
11168 | Prag := Next_Pragma (Prag); | |
11169 | end loop; | |
beacce02 AC |
11170 | |
11171 | -- Now deal with inherited preconditions | |
11172 | ||
11173 | for J in Inherited'Range loop | |
dac3bede | 11174 | Prag := Spec_PPC_List (Contract (Inherited (J))); |
beacce02 AC |
11175 | |
11176 | while Present (Prag) loop | |
11177 | if Pragma_Name (Prag) = Name_Precondition | |
11178 | and then Class_Present (Prag) | |
11179 | then | |
3c971dcc | 11180 | Inherited_Precond := Grab_PPC (Inherited (J)); |
beacce02 AC |
11181 | |
11182 | -- No precondition so far, so establish this as the first | |
11183 | ||
11184 | if No (Precond) then | |
11185 | Precond := Inherited_Precond; | |
11186 | ||
11187 | -- Here we already have a precondition, add inherited one | |
11188 | ||
11189 | else | |
11190 | -- Add new precondition to old one using OR ELSE | |
11191 | ||
11192 | declare | |
11193 | New_Expr : constant Node_Id := | |
11194 | Get_Pragma_Arg | |
11195 | (Next | |
11196 | (First | |
11197 | (Pragma_Argument_Associations | |
11198 | (Inherited_Precond)))); | |
11199 | Old_Expr : constant Node_Id := | |
11200 | Get_Pragma_Arg | |
11201 | (Next | |
11202 | (First | |
11203 | (Pragma_Argument_Associations | |
11204 | (Precond)))); | |
11205 | ||
11206 | begin | |
11207 | if Paren_Count (Old_Expr) = 0 then | |
11208 | Set_Paren_Count (Old_Expr, 1); | |
11209 | end if; | |
11210 | ||
11211 | if Paren_Count (New_Expr) = 0 then | |
11212 | Set_Paren_Count (New_Expr, 1); | |
11213 | end if; | |
11214 | ||
11215 | Rewrite (Old_Expr, | |
11216 | Make_Or_Else (Sloc (Old_Expr), | |
11217 | Left_Opnd => Relocate_Node (Old_Expr), | |
11218 | Right_Opnd => New_Expr)); | |
11219 | end; | |
11220 | ||
11221 | -- Add new message in the form: | |
11222 | ||
11223 | -- failed precondition from bla | |
11224 | -- also failed inherited precondition from bla | |
11225 | -- ... | |
11226 | ||
3c971dcc AC |
11227 | -- Skip this if exception locations are suppressed |
11228 | ||
11229 | if not Exception_Locations_Suppressed then | |
11230 | declare | |
11231 | New_Msg : constant Node_Id := | |
11232 | Get_Pragma_Arg | |
11233 | (Last | |
11234 | (Pragma_Argument_Associations | |
11235 | (Inherited_Precond))); | |
11236 | Old_Msg : constant Node_Id := | |
11237 | Get_Pragma_Arg | |
11238 | (Last | |
11239 | (Pragma_Argument_Associations | |
11240 | (Precond))); | |
11241 | begin | |
11242 | Start_String (Strval (Old_Msg)); | |
11243 | Store_String_Chars (ASCII.LF & " also "); | |
11244 | Store_String_Chars (Strval (New_Msg)); | |
11245 | Set_Strval (Old_Msg, End_String); | |
11246 | end; | |
11247 | end if; | |
beacce02 AC |
11248 | end if; |
11249 | end if; | |
11250 | ||
11251 | Prag := Next_Pragma (Prag); | |
11252 | end loop; | |
11253 | end loop; | |
11254 | ||
11255 | -- If we have built a precondition for Pre'Class (including any | |
11256 | -- Pre'Class aspects inherited from parent subprograms), then we | |
11257 | -- insert this composite precondition at this stage. | |
11258 | ||
11259 | if Present (Precond) then | |
11260 | Prepend (Precond, Declarations (N)); | |
11261 | end if; | |
21d27997 RD |
11262 | end if; |
11263 | ||
11264 | -- Build postconditions procedure if needed and prepend the following | |
11265 | -- declaration to the start of the declarations for the subprogram. | |
11266 | ||
11267 | -- procedure _postconditions [(_Result : resulttype)] is | |
11268 | -- begin | |
11269 | -- pragma Check (Postcondition, condition [,message]); | |
11270 | -- pragma Check (Postcondition, condition [,message]); | |
11271 | -- ... | |
e606088a AC |
11272 | -- Invariant_Procedure (_Result) ... |
11273 | -- Invariant_Procedure (Arg1) | |
11274 | -- ... | |
21d27997 RD |
11275 | -- end; |
11276 | ||
11277 | -- First we deal with the postconditions in the body | |
11278 | ||
11279 | if Is_Non_Empty_List (Declarations (N)) then | |
11280 | ||
11281 | -- Loop through declarations | |
11282 | ||
11283 | Prag := First (Declarations (N)); | |
11284 | while Present (Prag) loop | |
11285 | if Nkind (Prag) = N_Pragma then | |
11286 | ||
11287 | -- If pragma, capture if enabled postcondition, else ignore | |
11288 | ||
11289 | if Pragma_Name (Prag) = Name_Postcondition | |
11290 | and then Check_Enabled (Name_Postcondition) | |
11291 | then | |
11292 | if Plist = No_List then | |
11293 | Plist := Empty_List; | |
11294 | end if; | |
11295 | ||
11296 | Analyze (Prag); | |
0dabde3a | 11297 | |
f0709ca6 AC |
11298 | -- If expansion is disabled, as in a generic unit, save |
11299 | -- pragma for later expansion. | |
0dabde3a ES |
11300 | |
11301 | if not Expander_Active then | |
f0709ca6 | 11302 | Prepend (Grab_PPC, Declarations (N)); |
0dabde3a | 11303 | else |
f0709ca6 | 11304 | Append (Grab_PPC, Plist); |
0dabde3a | 11305 | end if; |
21d27997 RD |
11306 | end if; |
11307 | ||
11308 | Next (Prag); | |
11309 | ||
043ce308 | 11310 | -- Not a pragma, if comes from source, then end scan |
21d27997 RD |
11311 | |
11312 | elsif Comes_From_Source (Prag) then | |
11313 | exit; | |
11314 | ||
043ce308 | 11315 | -- Skip stuff not coming from source |
21d27997 RD |
11316 | |
11317 | else | |
11318 | Next (Prag); | |
11319 | end if; | |
11320 | end loop; | |
11321 | end if; | |
11322 | ||
11323 | -- Now deal with any postconditions from the spec | |
11324 | ||
11325 | if Present (Spec_Id) then | |
e606088a | 11326 | Spec_Postconditions : declare |
f0709ca6 AC |
11327 | procedure Process_Post_Conditions |
11328 | (Spec : Node_Id; | |
11329 | Class : Boolean); | |
11330 | -- This processes the Spec_PPC_List from Spec, processing any | |
11331 | -- postconditions from the list. If Class is True, then only | |
11332 | -- postconditions marked with Class_Present are considered. | |
11333 | -- The caller has checked that Spec_PPC_List is non-Empty. | |
11334 | ||
11335 | ----------------------------- | |
11336 | -- Process_Post_Conditions -- | |
11337 | ----------------------------- | |
11338 | ||
11339 | procedure Process_Post_Conditions | |
11340 | (Spec : Node_Id; | |
11341 | Class : Boolean) | |
11342 | is | |
11343 | Pspec : Node_Id; | |
21d27997 | 11344 | |
f0709ca6 AC |
11345 | begin |
11346 | if Class then | |
11347 | Pspec := Spec; | |
0dabde3a | 11348 | else |
f0709ca6 | 11349 | Pspec := Empty; |
0dabde3a | 11350 | end if; |
f0709ca6 AC |
11351 | |
11352 | -- Loop through PPC pragmas from spec | |
11353 | ||
dac3bede | 11354 | Prag := Spec_PPC_List (Contract (Spec)); |
f0709ca6 AC |
11355 | loop |
11356 | if Pragma_Name (Prag) = Name_Postcondition | |
f0709ca6 AC |
11357 | and then (not Class or else Class_Present (Prag)) |
11358 | then | |
11359 | if Plist = No_List then | |
11360 | Plist := Empty_List; | |
11361 | end if; | |
11362 | ||
11363 | if not Expander_Active then | |
11364 | Prepend | |
11365 | (Grab_PPC (Pspec), Declarations (N)); | |
11366 | else | |
11367 | Append (Grab_PPC (Pspec), Plist); | |
11368 | end if; | |
11369 | end if; | |
11370 | ||
11371 | Prag := Next_Pragma (Prag); | |
11372 | exit when No (Prag); | |
11373 | end loop; | |
11374 | end Process_Post_Conditions; | |
11375 | ||
e606088a AC |
11376 | -- Start of processing for Spec_Postconditions |
11377 | ||
f0709ca6 | 11378 | begin |
dac3bede | 11379 | if Present (Spec_PPC_List (Contract (Spec_Id))) then |
f0709ca6 | 11380 | Process_Post_Conditions (Spec_Id, Class => False); |
21d27997 RD |
11381 | end if; |
11382 | ||
beacce02 | 11383 | -- Process inherited postconditions |
f0709ca6 | 11384 | |
beacce02 | 11385 | for J in Inherited'Range loop |
dac3bede | 11386 | if Present (Spec_PPC_List (Contract (Inherited (J)))) then |
beacce02 | 11387 | Process_Post_Conditions (Inherited (J), Class => True); |
f0709ca6 AC |
11388 | end if; |
11389 | end loop; | |
e606088a | 11390 | end Spec_Postconditions; |
21d27997 RD |
11391 | end if; |
11392 | ||
e606088a AC |
11393 | -- If we had any postconditions and expansion is enabled, or if the |
11394 | -- procedure has invariants, then build the _Postconditions procedure. | |
21d27997 | 11395 | |
b4ca2d2c | 11396 | if (Present (Plist) or else Invariants_Or_Predicates_Present) |
0dabde3a ES |
11397 | and then Expander_Active |
11398 | then | |
e606088a AC |
11399 | if No (Plist) then |
11400 | Plist := Empty_List; | |
11401 | end if; | |
11402 | ||
11403 | -- Special processing for function case | |
11404 | ||
11405 | if Ekind (Designator) /= E_Procedure then | |
11406 | declare | |
11407 | Rent : constant Entity_Id := | |
fecbd779 | 11408 | Make_Defining_Identifier (Loc, Name_uResult); |
e606088a AC |
11409 | Ftyp : constant Entity_Id := Etype (Designator); |
11410 | ||
11411 | begin | |
11412 | Set_Etype (Rent, Ftyp); | |
11413 | ||
11414 | -- Add argument for return | |
11415 | ||
11416 | Parms := | |
11417 | New_List ( | |
11418 | Make_Parameter_Specification (Loc, | |
11419 | Parameter_Type => New_Occurrence_Of (Ftyp, Loc), | |
11420 | Defining_Identifier => Rent)); | |
11421 | ||
a4901c08 AC |
11422 | -- Add invariant call if returning type with invariants and |
11423 | -- this is a public function, i.e. a function declared in the | |
11424 | -- visible part of the package defining the private type. | |
e606088a | 11425 | |
fd0ff1cf RD |
11426 | if Has_Invariants (Etype (Rent)) |
11427 | and then Present (Invariant_Procedure (Etype (Rent))) | |
a4901c08 | 11428 | and then Is_Public_Subprogram_For (Etype (Rent)) |
fd0ff1cf | 11429 | then |
e606088a AC |
11430 | Append_To (Plist, |
11431 | Make_Invariant_Call (New_Occurrence_Of (Rent, Loc))); | |
11432 | end if; | |
11433 | end; | |
11434 | ||
11435 | -- Procedure rather than a function | |
21d27997 | 11436 | |
21d27997 RD |
11437 | else |
11438 | Parms := No_List; | |
11439 | end if; | |
11440 | ||
b4ca2d2c AC |
11441 | -- Add invariant calls and predicate calls for parameters. Note that |
11442 | -- this is done for functions as well, since in Ada 2012 they can | |
11443 | -- have IN OUT args. | |
e606088a AC |
11444 | |
11445 | declare | |
11446 | Formal : Entity_Id; | |
b4ca2d2c | 11447 | Ftype : Entity_Id; |
e606088a AC |
11448 | |
11449 | begin | |
11450 | Formal := First_Formal (Designator); | |
11451 | while Present (Formal) loop | |
b4ca2d2c AC |
11452 | if Ekind (Formal) /= E_In_Parameter then |
11453 | Ftype := Etype (Formal); | |
11454 | ||
11455 | if Has_Invariants (Ftype) | |
11456 | and then Present (Invariant_Procedure (Ftype)) | |
a4901c08 | 11457 | and then Is_Public_Subprogram_For (Ftype) |
b4ca2d2c AC |
11458 | then |
11459 | Append_To (Plist, | |
11460 | Make_Invariant_Call | |
11461 | (New_Occurrence_Of (Formal, Loc))); | |
11462 | end if; | |
11463 | ||
11464 | if Present (Predicate_Function (Ftype)) then | |
11465 | Append_To (Plist, | |
11466 | Make_Predicate_Check | |
11467 | (Ftype, New_Occurrence_Of (Formal, Loc))); | |
11468 | end if; | |
e606088a AC |
11469 | end if; |
11470 | ||
11471 | Next_Formal (Formal); | |
11472 | end loop; | |
11473 | end; | |
11474 | ||
11475 | -- Build and insert postcondition procedure | |
11476 | ||
043ce308 AC |
11477 | declare |
11478 | Post_Proc : constant Entity_Id := | |
e606088a AC |
11479 | Make_Defining_Identifier (Loc, |
11480 | Chars => Name_uPostconditions); | |
043ce308 | 11481 | -- The entity for the _Postconditions procedure |
f0709ca6 | 11482 | |
043ce308 | 11483 | begin |
043ce308 AC |
11484 | Prepend_To (Declarations (N), |
11485 | Make_Subprogram_Body (Loc, | |
11486 | Specification => | |
11487 | Make_Procedure_Specification (Loc, | |
11488 | Defining_Unit_Name => Post_Proc, | |
11489 | Parameter_Specifications => Parms), | |
11490 | ||
11491 | Declarations => Empty_List, | |
11492 | ||
11493 | Handled_Statement_Sequence => | |
11494 | Make_Handled_Sequence_Of_Statements (Loc, | |
11495 | Statements => Plist))); | |
21d27997 | 11496 | |
5ffe0bab | 11497 | Set_Ekind (Post_Proc, E_Procedure); |
5ffe0bab | 11498 | |
3bb3f6d6 AC |
11499 | -- If this is a procedure, set the Postcondition_Proc attribute on |
11500 | -- the proper defining entity for the subprogram. | |
21d27997 | 11501 | |
e606088a AC |
11502 | if Ekind (Designator) = E_Procedure then |
11503 | Set_Postcondition_Proc (Designator, Post_Proc); | |
043ce308 AC |
11504 | end if; |
11505 | end; | |
21d27997 | 11506 | |
e606088a | 11507 | Set_Has_Postconditions (Designator); |
21d27997 RD |
11508 | end if; |
11509 | end Process_PPCs; | |
11510 | ||
fbf5a39b AC |
11511 | ---------------------------- |
11512 | -- Reference_Body_Formals -- | |
11513 | ---------------------------- | |
11514 | ||
11515 | procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is | |
11516 | Fs : Entity_Id; | |
11517 | Fb : Entity_Id; | |
11518 | ||
11519 | begin | |
11520 | if Error_Posted (Spec) then | |
11521 | return; | |
11522 | end if; | |
11523 | ||
0a36105d JM |
11524 | -- Iterate over both lists. They may be of different lengths if the two |
11525 | -- specs are not conformant. | |
11526 | ||
fbf5a39b AC |
11527 | Fs := First_Formal (Spec); |
11528 | Fb := First_Formal (Bod); | |
0a36105d | 11529 | while Present (Fs) and then Present (Fb) loop |
fbf5a39b AC |
11530 | Generate_Reference (Fs, Fb, 'b'); |
11531 | ||
11532 | if Style_Check then | |
11533 | Style.Check_Identifier (Fb, Fs); | |
11534 | end if; | |
11535 | ||
11536 | Set_Spec_Entity (Fb, Fs); | |
11537 | Set_Referenced (Fs, False); | |
11538 | Next_Formal (Fs); | |
11539 | Next_Formal (Fb); | |
11540 | end loop; | |
11541 | end Reference_Body_Formals; | |
11542 | ||
996ae0b0 RK |
11543 | ------------------------- |
11544 | -- Set_Actual_Subtypes -- | |
11545 | ------------------------- | |
11546 | ||
11547 | procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is | |
2820d220 AC |
11548 | Decl : Node_Id; |
11549 | Formal : Entity_Id; | |
11550 | T : Entity_Id; | |
11551 | First_Stmt : Node_Id := Empty; | |
11552 | AS_Needed : Boolean; | |
996ae0b0 RK |
11553 | |
11554 | begin | |
f3d57416 | 11555 | -- If this is an empty initialization procedure, no need to create |
fbf5a39b AC |
11556 | -- actual subtypes (small optimization). |
11557 | ||
11558 | if Ekind (Subp) = E_Procedure | |
11559 | and then Is_Null_Init_Proc (Subp) | |
11560 | then | |
11561 | return; | |
11562 | end if; | |
11563 | ||
996ae0b0 RK |
11564 | Formal := First_Formal (Subp); |
11565 | while Present (Formal) loop | |
11566 | T := Etype (Formal); | |
11567 | ||
e895b435 | 11568 | -- We never need an actual subtype for a constrained formal |
996ae0b0 RK |
11569 | |
11570 | if Is_Constrained (T) then | |
11571 | AS_Needed := False; | |
11572 | ||
82c80734 RD |
11573 | -- If we have unknown discriminants, then we do not need an actual |
11574 | -- subtype, or more accurately we cannot figure it out! Note that | |
11575 | -- all class-wide types have unknown discriminants. | |
996ae0b0 RK |
11576 | |
11577 | elsif Has_Unknown_Discriminants (T) then | |
11578 | AS_Needed := False; | |
11579 | ||
82c80734 RD |
11580 | -- At this stage we have an unconstrained type that may need an |
11581 | -- actual subtype. For sure the actual subtype is needed if we have | |
11582 | -- an unconstrained array type. | |
996ae0b0 RK |
11583 | |
11584 | elsif Is_Array_Type (T) then | |
11585 | AS_Needed := True; | |
11586 | ||
d8db0bca JM |
11587 | -- The only other case needing an actual subtype is an unconstrained |
11588 | -- record type which is an IN parameter (we cannot generate actual | |
11589 | -- subtypes for the OUT or IN OUT case, since an assignment can | |
11590 | -- change the discriminant values. However we exclude the case of | |
11591 | -- initialization procedures, since discriminants are handled very | |
11592 | -- specially in this context, see the section entitled "Handling of | |
11593 | -- Discriminants" in Einfo. | |
11594 | ||
11595 | -- We also exclude the case of Discrim_SO_Functions (functions used | |
11596 | -- in front end layout mode for size/offset values), since in such | |
11597 | -- functions only discriminants are referenced, and not only are such | |
11598 | -- subtypes not needed, but they cannot always be generated, because | |
11599 | -- of order of elaboration issues. | |
996ae0b0 RK |
11600 | |
11601 | elsif Is_Record_Type (T) | |
11602 | and then Ekind (Formal) = E_In_Parameter | |
11603 | and then Chars (Formal) /= Name_uInit | |
5d09245e | 11604 | and then not Is_Unchecked_Union (T) |
996ae0b0 RK |
11605 | and then not Is_Discrim_SO_Function (Subp) |
11606 | then | |
11607 | AS_Needed := True; | |
11608 | ||
11609 | -- All other cases do not need an actual subtype | |
11610 | ||
11611 | else | |
11612 | AS_Needed := False; | |
11613 | end if; | |
11614 | ||
11615 | -- Generate actual subtypes for unconstrained arrays and | |
11616 | -- unconstrained discriminated records. | |
11617 | ||
11618 | if AS_Needed then | |
7324bf49 | 11619 | if Nkind (N) = N_Accept_Statement then |
fbf5a39b | 11620 | |
57a8057a | 11621 | -- If expansion is active, the formal is replaced by a local |
fbf5a39b AC |
11622 | -- variable that renames the corresponding entry of the |
11623 | -- parameter block, and it is this local variable that may | |
da94696d | 11624 | -- require an actual subtype. |
fbf5a39b | 11625 | |
da94696d | 11626 | if Full_Expander_Active then |
fbf5a39b AC |
11627 | Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
11628 | else | |
11629 | Decl := Build_Actual_Subtype (T, Formal); | |
11630 | end if; | |
11631 | ||
996ae0b0 RK |
11632 | if Present (Handled_Statement_Sequence (N)) then |
11633 | First_Stmt := | |
11634 | First (Statements (Handled_Statement_Sequence (N))); | |
11635 | Prepend (Decl, Statements (Handled_Statement_Sequence (N))); | |
11636 | Mark_Rewrite_Insertion (Decl); | |
11637 | else | |
82c80734 RD |
11638 | -- If the accept statement has no body, there will be no |
11639 | -- reference to the actuals, so no need to compute actual | |
11640 | -- subtypes. | |
996ae0b0 RK |
11641 | |
11642 | return; | |
11643 | end if; | |
11644 | ||
11645 | else | |
fbf5a39b | 11646 | Decl := Build_Actual_Subtype (T, Formal); |
996ae0b0 RK |
11647 | Prepend (Decl, Declarations (N)); |
11648 | Mark_Rewrite_Insertion (Decl); | |
11649 | end if; | |
11650 | ||
82c80734 RD |
11651 | -- The declaration uses the bounds of an existing object, and |
11652 | -- therefore needs no constraint checks. | |
2820d220 | 11653 | |
7324bf49 | 11654 | Analyze (Decl, Suppress => All_Checks); |
2820d220 | 11655 | |
996ae0b0 RK |
11656 | -- We need to freeze manually the generated type when it is |
11657 | -- inserted anywhere else than in a declarative part. | |
11658 | ||
11659 | if Present (First_Stmt) then | |
11660 | Insert_List_Before_And_Analyze (First_Stmt, | |
c159409f | 11661 | Freeze_Entity (Defining_Identifier (Decl), N)); |
996ae0b0 RK |
11662 | end if; |
11663 | ||
fbf5a39b | 11664 | if Nkind (N) = N_Accept_Statement |
da94696d | 11665 | and then Full_Expander_Active |
fbf5a39b AC |
11666 | then |
11667 | Set_Actual_Subtype (Renamed_Object (Formal), | |
11668 | Defining_Identifier (Decl)); | |
11669 | else | |
11670 | Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); | |
11671 | end if; | |
996ae0b0 RK |
11672 | end if; |
11673 | ||
11674 | Next_Formal (Formal); | |
11675 | end loop; | |
11676 | end Set_Actual_Subtypes; | |
11677 | ||
11678 | --------------------- | |
11679 | -- Set_Formal_Mode -- | |
11680 | --------------------- | |
11681 | ||
11682 | procedure Set_Formal_Mode (Formal_Id : Entity_Id) is | |
11683 | Spec : constant Node_Id := Parent (Formal_Id); | |
11684 | ||
11685 | begin | |
11686 | -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters | |
11687 | -- since we ensure that corresponding actuals are always valid at the | |
11688 | -- point of the call. | |
11689 | ||
11690 | if Out_Present (Spec) then | |
996ae0b0 RK |
11691 | if Ekind (Scope (Formal_Id)) = E_Function |
11692 | or else Ekind (Scope (Formal_Id)) = E_Generic_Function | |
11693 | then | |
b4ca2d2c | 11694 | -- [IN] OUT parameters allowed for functions in Ada 2012 |
c56a9ba4 AC |
11695 | |
11696 | if Ada_Version >= Ada_2012 then | |
11697 | if In_Present (Spec) then | |
11698 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
11699 | else | |
11700 | Set_Ekind (Formal_Id, E_Out_Parameter); | |
11701 | end if; | |
11702 | ||
b4ca2d2c AC |
11703 | -- But not in earlier versions of Ada |
11704 | ||
c56a9ba4 AC |
11705 | else |
11706 | Error_Msg_N ("functions can only have IN parameters", Spec); | |
11707 | Set_Ekind (Formal_Id, E_In_Parameter); | |
11708 | end if; | |
996ae0b0 RK |
11709 | |
11710 | elsif In_Present (Spec) then | |
11711 | Set_Ekind (Formal_Id, E_In_Out_Parameter); | |
11712 | ||
11713 | else | |
fbf5a39b AC |
11714 | Set_Ekind (Formal_Id, E_Out_Parameter); |
11715 | Set_Never_Set_In_Source (Formal_Id, True); | |
11716 | Set_Is_True_Constant (Formal_Id, False); | |
11717 | Set_Current_Value (Formal_Id, Empty); | |
996ae0b0 RK |
11718 | end if; |
11719 | ||
11720 | else | |
11721 | Set_Ekind (Formal_Id, E_In_Parameter); | |
11722 | end if; | |
11723 | ||
fbf5a39b | 11724 | -- Set Is_Known_Non_Null for access parameters since the language |
82c80734 RD |
11725 | -- guarantees that access parameters are always non-null. We also set |
11726 | -- Can_Never_Be_Null, since there is no way to change the value. | |
fbf5a39b AC |
11727 | |
11728 | if Nkind (Parameter_Type (Spec)) = N_Access_Definition then | |
2820d220 | 11729 | |
885c4871 | 11730 | -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
2813bb6b | 11731 | -- null; In Ada 2005, only if then null_exclusion is explicit. |
2820d220 | 11732 | |
0791fbe9 | 11733 | if Ada_Version < Ada_2005 |
2813bb6b | 11734 | or else Can_Never_Be_Null (Etype (Formal_Id)) |
2820d220 AC |
11735 | then |
11736 | Set_Is_Known_Non_Null (Formal_Id); | |
11737 | Set_Can_Never_Be_Null (Formal_Id); | |
11738 | end if; | |
2813bb6b | 11739 | |
41251c60 JM |
11740 | -- Ada 2005 (AI-231): Null-exclusion access subtype |
11741 | ||
2813bb6b ES |
11742 | elsif Is_Access_Type (Etype (Formal_Id)) |
11743 | and then Can_Never_Be_Null (Etype (Formal_Id)) | |
11744 | then | |
2813bb6b | 11745 | Set_Is_Known_Non_Null (Formal_Id); |
a1d72281 EB |
11746 | |
11747 | -- We can also set Can_Never_Be_Null (thus preventing some junk | |
11748 | -- access checks) for the case of an IN parameter, which cannot | |
11749 | -- be changed, or for an IN OUT parameter, which can be changed but | |
11750 | -- not to a null value. But for an OUT parameter, the initial value | |
11751 | -- passed in can be null, so we can't set this flag in that case. | |
11752 | ||
11753 | if Ekind (Formal_Id) /= E_Out_Parameter then | |
11754 | Set_Can_Never_Be_Null (Formal_Id); | |
11755 | end if; | |
fbf5a39b AC |
11756 | end if; |
11757 | ||
996ae0b0 RK |
11758 | Set_Mechanism (Formal_Id, Default_Mechanism); |
11759 | Set_Formal_Validity (Formal_Id); | |
11760 | end Set_Formal_Mode; | |
11761 | ||
11762 | ------------------------- | |
11763 | -- Set_Formal_Validity -- | |
11764 | ------------------------- | |
11765 | ||
11766 | procedure Set_Formal_Validity (Formal_Id : Entity_Id) is | |
11767 | begin | |
82c80734 RD |
11768 | -- If no validity checking, then we cannot assume anything about the |
11769 | -- validity of parameters, since we do not know there is any checking | |
11770 | -- of the validity on the call side. | |
996ae0b0 RK |
11771 | |
11772 | if not Validity_Checks_On then | |
11773 | return; | |
11774 | ||
fbf5a39b AC |
11775 | -- If validity checking for parameters is enabled, this means we are |
11776 | -- not supposed to make any assumptions about argument values. | |
11777 | ||
11778 | elsif Validity_Check_Parameters then | |
11779 | return; | |
11780 | ||
11781 | -- If we are checking in parameters, we will assume that the caller is | |
11782 | -- also checking parameters, so we can assume the parameter is valid. | |
11783 | ||
996ae0b0 RK |
11784 | elsif Ekind (Formal_Id) = E_In_Parameter |
11785 | and then Validity_Check_In_Params | |
11786 | then | |
11787 | Set_Is_Known_Valid (Formal_Id, True); | |
11788 | ||
fbf5a39b AC |
11789 | -- Similar treatment for IN OUT parameters |
11790 | ||
996ae0b0 RK |
11791 | elsif Ekind (Formal_Id) = E_In_Out_Parameter |
11792 | and then Validity_Check_In_Out_Params | |
11793 | then | |
11794 | Set_Is_Known_Valid (Formal_Id, True); | |
11795 | end if; | |
11796 | end Set_Formal_Validity; | |
11797 | ||
11798 | ------------------------ | |
11799 | -- Subtype_Conformant -- | |
11800 | ------------------------ | |
11801 | ||
ce2b6ba5 JM |
11802 | function Subtype_Conformant |
11803 | (New_Id : Entity_Id; | |
11804 | Old_Id : Entity_Id; | |
11805 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
11806 | is | |
996ae0b0 | 11807 | Result : Boolean; |
996ae0b0 | 11808 | begin |
ce2b6ba5 JM |
11809 | Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
11810 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
11811 | return Result; |
11812 | end Subtype_Conformant; | |
11813 | ||
11814 | --------------------- | |
11815 | -- Type_Conformant -- | |
11816 | --------------------- | |
11817 | ||
41251c60 JM |
11818 | function Type_Conformant |
11819 | (New_Id : Entity_Id; | |
11820 | Old_Id : Entity_Id; | |
11821 | Skip_Controlling_Formals : Boolean := False) return Boolean | |
11822 | is | |
996ae0b0 | 11823 | Result : Boolean; |
996ae0b0 | 11824 | begin |
c8ef728f ES |
11825 | May_Hide_Profile := False; |
11826 | ||
41251c60 JM |
11827 | Check_Conformance |
11828 | (New_Id, Old_Id, Type_Conformant, False, Result, | |
11829 | Skip_Controlling_Formals => Skip_Controlling_Formals); | |
996ae0b0 RK |
11830 | return Result; |
11831 | end Type_Conformant; | |
11832 | ||
11833 | ------------------------------- | |
11834 | -- Valid_Operator_Definition -- | |
11835 | ------------------------------- | |
11836 | ||
11837 | procedure Valid_Operator_Definition (Designator : Entity_Id) is | |
11838 | N : Integer := 0; | |
11839 | F : Entity_Id; | |
11840 | Id : constant Name_Id := Chars (Designator); | |
11841 | N_OK : Boolean; | |
11842 | ||
11843 | begin | |
11844 | F := First_Formal (Designator); | |
996ae0b0 RK |
11845 | while Present (F) loop |
11846 | N := N + 1; | |
11847 | ||
11848 | if Present (Default_Value (F)) then | |
ed2233dc | 11849 | Error_Msg_N |
996ae0b0 RK |
11850 | ("default values not allowed for operator parameters", |
11851 | Parent (F)); | |
11852 | end if; | |
11853 | ||
11854 | Next_Formal (F); | |
11855 | end loop; | |
11856 | ||
11857 | -- Verify that user-defined operators have proper number of arguments | |
11858 | -- First case of operators which can only be unary | |
11859 | ||
11860 | if Id = Name_Op_Not | |
11861 | or else Id = Name_Op_Abs | |
11862 | then | |
11863 | N_OK := (N = 1); | |
11864 | ||
11865 | -- Case of operators which can be unary or binary | |
11866 | ||
11867 | elsif Id = Name_Op_Add | |
11868 | or Id = Name_Op_Subtract | |
11869 | then | |
11870 | N_OK := (N in 1 .. 2); | |
11871 | ||
11872 | -- All other operators can only be binary | |
11873 | ||
11874 | else | |
11875 | N_OK := (N = 2); | |
11876 | end if; | |
11877 | ||
11878 | if not N_OK then | |
11879 | Error_Msg_N | |
11880 | ("incorrect number of arguments for operator", Designator); | |
11881 | end if; | |
11882 | ||
11883 | if Id = Name_Op_Ne | |
11884 | and then Base_Type (Etype (Designator)) = Standard_Boolean | |
11885 | and then not Is_Intrinsic_Subprogram (Designator) | |
11886 | then | |
11887 | Error_Msg_N | |
11888 | ("explicit definition of inequality not allowed", Designator); | |
11889 | end if; | |
11890 | end Valid_Operator_Definition; | |
11891 | ||
11892 | end Sem_Ch6; |