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1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M _ C H 4 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
8 | -- -- | |
1d005acc | 9 | -- Copyright (C) 1992-2019, 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- -- | |
157a9bf5 | 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 -- | |
157a9bf5 ES |
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 | ||
d50f4827 | 26 | with Aspects; use Aspects; |
996ae0b0 RK |
27 | with Atree; use Atree; |
28 | with Debug; use Debug; | |
29 | with Einfo; use Einfo; | |
35ae2ed8 | 30 | with Elists; use Elists; |
996ae0b0 RK |
31 | with Errout; use Errout; |
32 | with Exp_Util; use Exp_Util; | |
996ae0b0 | 33 | with Itypes; use Itypes; |
d935a36e | 34 | with Lib; use Lib; |
996ae0b0 RK |
35 | with Lib.Xref; use Lib.Xref; |
36 | with Namet; use Namet; | |
d469eabe | 37 | with Namet.Sp; use Namet.Sp; |
996ae0b0 RK |
38 | with Nlists; use Nlists; |
39 | with Nmake; use Nmake; | |
40 | with Opt; use Opt; | |
41 | with Output; use Output; | |
42 | with Restrict; use Restrict; | |
6e937c1c | 43 | with Rident; use Rident; |
996ae0b0 | 44 | with Sem; use Sem; |
a4100e55 | 45 | with Sem_Aux; use Sem_Aux; |
19d846a0 | 46 | with Sem_Case; use Sem_Case; |
996ae0b0 RK |
47 | with Sem_Cat; use Sem_Cat; |
48 | with Sem_Ch3; use Sem_Ch3; | |
d469eabe | 49 | with Sem_Ch6; use Sem_Ch6; |
996ae0b0 | 50 | with Sem_Ch8; use Sem_Ch8; |
dec6faf1 | 51 | with Sem_Dim; use Sem_Dim; |
b67a385c | 52 | with Sem_Disp; use Sem_Disp; |
996ae0b0 RK |
53 | with Sem_Dist; use Sem_Dist; |
54 | with Sem_Eval; use Sem_Eval; | |
55 | with Sem_Res; use Sem_Res; | |
996ae0b0 | 56 | with Sem_Type; use Sem_Type; |
19d846a0 RD |
57 | with Sem_Util; use Sem_Util; |
58 | with Sem_Warn; use Sem_Warn; | |
996ae0b0 RK |
59 | with Stand; use Stand; |
60 | with Sinfo; use Sinfo; | |
61 | with Snames; use Snames; | |
62 | with Tbuild; use Tbuild; | |
b727a82b | 63 | with Uintp; use Uintp; |
996ae0b0 | 64 | |
996ae0b0 RK |
65 | package body Sem_Ch4 is |
66 | ||
22e89283 AC |
67 | -- Tables which speed up the identification of dangerous calls to Ada 2012 |
68 | -- functions with writable actuals (AI05-0144). | |
69 | ||
70 | -- The following table enumerates the Ada constructs which may evaluate in | |
71 | -- arbitrary order. It does not cover all the language constructs which can | |
72 | -- be evaluated in arbitrary order but the subset needed for AI05-0144. | |
73 | ||
74 | Has_Arbitrary_Evaluation_Order : constant array (Node_Kind) of Boolean := | |
75 | (N_Aggregate => True, | |
76 | N_Assignment_Statement => True, | |
77 | N_Entry_Call_Statement => True, | |
78 | N_Extension_Aggregate => True, | |
79 | N_Full_Type_Declaration => True, | |
80 | N_Indexed_Component => True, | |
81 | N_Object_Declaration => True, | |
82 | N_Pragma => True, | |
83 | N_Range => True, | |
84 | N_Slice => True, | |
213999c2 AC |
85 | N_Array_Type_Definition => True, |
86 | N_Membership_Test => True, | |
87 | N_Binary_Op => True, | |
88 | N_Subprogram_Call => True, | |
22e89283 AC |
89 | others => False); |
90 | ||
91 | -- The following table enumerates the nodes on which we stop climbing when | |
92 | -- locating the outermost Ada construct that can be evaluated in arbitrary | |
93 | -- order. | |
94 | ||
95 | Stop_Subtree_Climbing : constant array (Node_Kind) of Boolean := | |
96 | (N_Aggregate => True, | |
97 | N_Assignment_Statement => True, | |
98 | N_Entry_Call_Statement => True, | |
99 | N_Extended_Return_Statement => True, | |
100 | N_Extension_Aggregate => True, | |
101 | N_Full_Type_Declaration => True, | |
102 | N_Object_Declaration => True, | |
103 | N_Object_Renaming_Declaration => True, | |
104 | N_Package_Specification => True, | |
105 | N_Pragma => True, | |
106 | N_Procedure_Call_Statement => True, | |
107 | N_Simple_Return_Statement => True, | |
213999c2 | 108 | N_Has_Condition => True, |
22e89283 AC |
109 | others => False); |
110 | ||
996ae0b0 RK |
111 | ----------------------- |
112 | -- Local Subprograms -- | |
113 | ----------------------- | |
114 | ||
fe39cf20 BD |
115 | procedure Analyze_Concatenation_Rest (N : Node_Id); |
116 | -- Does the "rest" of the work of Analyze_Concatenation, after the left | |
117 | -- operand has been analyzed. See Analyze_Concatenation for details. | |
118 | ||
996ae0b0 | 119 | procedure Analyze_Expression (N : Node_Id); |
80211802 AC |
120 | -- For expressions that are not names, this is just a call to analyze. If |
121 | -- the expression is a name, it may be a call to a parameterless function, | |
122 | -- and if so must be converted into an explicit call node and analyzed as | |
123 | -- such. This deproceduring must be done during the first pass of overload | |
124 | -- resolution, because otherwise a procedure call with overloaded actuals | |
125 | -- may fail to resolve. | |
996ae0b0 RK |
126 | |
127 | procedure Analyze_Operator_Call (N : Node_Id; Op_Id : Entity_Id); | |
80211802 AC |
128 | -- Analyze a call of the form "+"(x, y), etc. The prefix of the call is an |
129 | -- operator name or an expanded name whose selector is an operator name, | |
130 | -- and one possible interpretation is as a predefined operator. | |
996ae0b0 RK |
131 | |
132 | procedure Analyze_Overloaded_Selected_Component (N : Node_Id); | |
133 | -- If the prefix of a selected_component is overloaded, the proper | |
134 | -- interpretation that yields a record type with the proper selector | |
135 | -- name must be selected. | |
136 | ||
137 | procedure Analyze_User_Defined_Binary_Op (N : Node_Id; Op_Id : Entity_Id); | |
138 | -- Procedure to analyze a user defined binary operator, which is resolved | |
139 | -- like a function, but instead of a list of actuals it is presented | |
140 | -- with the left and right operands of an operator node. | |
141 | ||
142 | procedure Analyze_User_Defined_Unary_Op (N : Node_Id; Op_Id : Entity_Id); | |
143 | -- Procedure to analyze a user defined unary operator, which is resolved | |
144 | -- like a function, but instead of a list of actuals, it is presented with | |
145 | -- the operand of the operator node. | |
146 | ||
147 | procedure Ambiguous_Operands (N : Node_Id); | |
0877856b | 148 | -- For equality, membership, and comparison operators with overloaded |
996ae0b0 RK |
149 | -- arguments, list possible interpretations. |
150 | ||
996ae0b0 | 151 | procedure Analyze_One_Call |
ec6078e3 ES |
152 | (N : Node_Id; |
153 | Nam : Entity_Id; | |
154 | Report : Boolean; | |
155 | Success : out Boolean; | |
156 | Skip_First : Boolean := False); | |
996ae0b0 RK |
157 | -- Check one interpretation of an overloaded subprogram name for |
158 | -- compatibility with the types of the actuals in a call. If there is a | |
159 | -- single interpretation which does not match, post error if Report is | |
160 | -- set to True. | |
161 | -- | |
162 | -- Nam is the entity that provides the formals against which the actuals | |
163 | -- are checked. Nam is either the name of a subprogram, or the internal | |
164 | -- subprogram type constructed for an access_to_subprogram. If the actuals | |
165 | -- are compatible with Nam, then Nam is added to the list of candidate | |
166 | -- interpretations for N, and Success is set to True. | |
ec6078e3 ES |
167 | -- |
168 | -- The flag Skip_First is used when analyzing a call that was rewritten | |
169 | -- from object notation. In this case the first actual may have to receive | |
170 | -- an explicit dereference, depending on the first formal of the operation | |
171 | -- being called. The caller will have verified that the object is legal | |
172 | -- for the call. If the remaining parameters match, the first parameter | |
173 | -- will rewritten as a dereference if needed, prior to completing analysis. | |
996ae0b0 RK |
174 | procedure Check_Misspelled_Selector |
175 | (Prefix : Entity_Id; | |
176 | Sel : Node_Id); | |
80211802 | 177 | -- Give possible misspelling message if Sel seems likely to be a mis- |
8dbf3473 AC |
178 | -- spelling of one of the selectors of the Prefix. This is called by |
179 | -- Analyze_Selected_Component after producing an invalid selector error | |
180 | -- message. | |
996ae0b0 RK |
181 | |
182 | function Defined_In_Scope (T : Entity_Id; S : Entity_Id) return Boolean; | |
f3d57416 | 183 | -- Verify that type T is declared in scope S. Used to find interpretations |
996ae0b0 RK |
184 | -- for operators given by expanded names. This is abstracted as a separate |
185 | -- function to handle extensions to System, where S is System, but T is | |
186 | -- declared in the extension. | |
187 | ||
188 | procedure Find_Arithmetic_Types | |
189 | (L, R : Node_Id; | |
190 | Op_Id : Entity_Id; | |
191 | N : Node_Id); | |
80211802 AC |
192 | -- L and R are the operands of an arithmetic operator. Find consistent |
193 | -- pairs of interpretations for L and R that have a numeric type consistent | |
194 | -- with the semantics of the operator. | |
996ae0b0 RK |
195 | |
196 | procedure Find_Comparison_Types | |
197 | (L, R : Node_Id; | |
198 | Op_Id : Entity_Id; | |
199 | N : Node_Id); | |
80211802 AC |
200 | -- L and R are operands of a comparison operator. Find consistent pairs of |
201 | -- interpretations for L and R. | |
996ae0b0 RK |
202 | |
203 | procedure Find_Concatenation_Types | |
204 | (L, R : Node_Id; | |
205 | Op_Id : Entity_Id; | |
206 | N : Node_Id); | |
6e73e3ab | 207 | -- For the four varieties of concatenation |
996ae0b0 RK |
208 | |
209 | procedure Find_Equality_Types | |
210 | (L, R : Node_Id; | |
211 | Op_Id : Entity_Id; | |
212 | N : Node_Id); | |
6e73e3ab | 213 | -- Ditto for equality operators |
996ae0b0 RK |
214 | |
215 | procedure Find_Boolean_Types | |
216 | (L, R : Node_Id; | |
217 | Op_Id : Entity_Id; | |
218 | N : Node_Id); | |
6e73e3ab | 219 | -- Ditto for binary logical operations |
996ae0b0 RK |
220 | |
221 | procedure Find_Negation_Types | |
222 | (R : Node_Id; | |
223 | Op_Id : Entity_Id; | |
224 | N : Node_Id); | |
6e73e3ab | 225 | -- Find consistent interpretation for operand of negation operator |
996ae0b0 RK |
226 | |
227 | procedure Find_Non_Universal_Interpretations | |
228 | (N : Node_Id; | |
229 | R : Node_Id; | |
230 | Op_Id : Entity_Id; | |
231 | T1 : Entity_Id); | |
5dc203d2 AC |
232 | -- For equality and comparison operators, the result is always boolean, and |
233 | -- the legality of the operation is determined from the visibility of the | |
234 | -- operand types. If one of the operands has a universal interpretation, | |
235 | -- the legality check uses some compatible non-universal interpretation of | |
236 | -- the other operand. N can be an operator node, or a function call whose | |
237 | -- name is an operator designator. Any_Access, which is the initial type of | |
238 | -- the literal NULL, is a universal type for the purpose of this routine. | |
996ae0b0 | 239 | |
d469eabe | 240 | function Find_Primitive_Operation (N : Node_Id) return Boolean; |
5dc203d2 AC |
241 | -- Find candidate interpretations for the name Obj.Proc when it appears in |
242 | -- a subprogram renaming declaration. | |
d469eabe | 243 | |
996ae0b0 RK |
244 | procedure Find_Unary_Types |
245 | (R : Node_Id; | |
246 | Op_Id : Entity_Id; | |
247 | N : Node_Id); | |
6e73e3ab | 248 | -- Unary arithmetic types: plus, minus, abs |
996ae0b0 RK |
249 | |
250 | procedure Check_Arithmetic_Pair | |
251 | (T1, T2 : Entity_Id; | |
252 | Op_Id : Entity_Id; | |
253 | N : Node_Id); | |
84dad556 AC |
254 | -- Subsidiary procedure to Find_Arithmetic_Types. T1 and T2 are valid types |
255 | -- for left and right operand. Determine whether they constitute a valid | |
256 | -- pair for the given operator, and record the corresponding interpretation | |
257 | -- of the operator node. The node N may be an operator node (the usual | |
258 | -- case) or a function call whose prefix is an operator designator. In | |
259 | -- both cases Op_Id is the operator name itself. | |
996ae0b0 RK |
260 | |
261 | procedure Diagnose_Call (N : Node_Id; Nam : Node_Id); | |
262 | -- Give detailed information on overloaded call where none of the | |
263 | -- interpretations match. N is the call node, Nam the designator for | |
264 | -- the overloaded entity being called. | |
265 | ||
266 | function Junk_Operand (N : Node_Id) return Boolean; | |
267 | -- Test for an operand that is an inappropriate entity (e.g. a package | |
268 | -- name or a label). If so, issue an error message and return True. If | |
269 | -- the operand is not an inappropriate entity kind, return False. | |
270 | ||
271 | procedure Operator_Check (N : Node_Id); | |
da709d08 AC |
272 | -- Verify that an operator has received some valid interpretation. If none |
273 | -- was found, determine whether a use clause would make the operation | |
274 | -- legal. The variable Candidate_Type (defined in Sem_Type) is set for | |
275 | -- every type compatible with the operator, even if the operator for the | |
276 | -- type is not directly visible. The routine uses this type to emit a more | |
277 | -- informative message. | |
996ae0b0 | 278 | |
d469eabe | 279 | function Process_Implicit_Dereference_Prefix |
da709d08 | 280 | (E : Entity_Id; |
d469eabe | 281 | P : Node_Id) return Entity_Id; |
da709d08 | 282 | -- Called when P is the prefix of an implicit dereference, denoting an |
d469eabe HK |
283 | -- object E. The function returns the designated type of the prefix, taking |
284 | -- into account that the designated type of an anonymous access type may be | |
a316b3fc | 285 | -- a limited view, when the nonlimited view is visible. |
84dad556 | 286 | -- |
d469eabe HK |
287 | -- If in semantics only mode (-gnatc or generic), the function also records |
288 | -- that the prefix is a reference to E, if any. Normally, such a reference | |
289 | -- is generated only when the implicit dereference is expanded into an | |
290 | -- explicit one, but for consistency we must generate the reference when | |
291 | -- expansion is disabled as well. | |
6e73e3ab | 292 | |
30c20106 AC |
293 | procedure Remove_Abstract_Operations (N : Node_Id); |
294 | -- Ada 2005: implementation of AI-310. An abstract non-dispatching | |
295 | -- operation is not a candidate interpretation. | |
296 | ||
d50f4827 AC |
297 | function Try_Container_Indexing |
298 | (N : Node_Id; | |
299 | Prefix : Node_Id; | |
50878404 | 300 | Exprs : List_Id) return Boolean; |
d50f4827 AC |
301 | -- AI05-0139: Generalized indexing to support iterators over containers |
302 | ||
996ae0b0 | 303 | function Try_Indexed_Call |
aab883ec ES |
304 | (N : Node_Id; |
305 | Nam : Entity_Id; | |
306 | Typ : Entity_Id; | |
307 | Skip_First : Boolean) return Boolean; | |
308 | -- If a function has defaults for all its actuals, a call to it may in fact | |
309 | -- be an indexing on the result of the call. Try_Indexed_Call attempts the | |
310 | -- interpretation as an indexing, prior to analysis as a call. If both are | |
311 | -- possible, the node is overloaded with both interpretations (same symbol | |
312 | -- but two different types). If the call is written in prefix form, the | |
313 | -- prefix becomes the first parameter in the call, and only the remaining | |
314 | -- actuals must be checked for the presence of defaults. | |
996ae0b0 RK |
315 | |
316 | function Try_Indirect_Call | |
91b1417d AC |
317 | (N : Node_Id; |
318 | Nam : Entity_Id; | |
319 | Typ : Entity_Id) return Boolean; | |
aab883ec ES |
320 | -- Similarly, a function F that needs no actuals can return an access to a |
321 | -- subprogram, and the call F (X) interpreted as F.all (X). In this case | |
322 | -- the call may be overloaded with both interpretations. | |
996ae0b0 | 323 | |
b4592168 GD |
324 | procedure wpo (T : Entity_Id); |
325 | pragma Warnings (Off, wpo); | |
326 | -- Used for debugging: obtain list of primitive operations even if | |
327 | -- type is not frozen and dispatch table is not built yet. | |
328 | ||
996ae0b0 RK |
329 | ------------------------ |
330 | -- Ambiguous_Operands -- | |
331 | ------------------------ | |
332 | ||
333 | procedure Ambiguous_Operands (N : Node_Id) is | |
fbf5a39b | 334 | procedure List_Operand_Interps (Opnd : Node_Id); |
996ae0b0 | 335 | |
4c46b835 AC |
336 | -------------------------- |
337 | -- List_Operand_Interps -- | |
338 | -------------------------- | |
339 | ||
fbf5a39b | 340 | procedure List_Operand_Interps (Opnd : Node_Id) is |
dcd5fd67 PMR |
341 | Nam : Node_Id := Empty; |
342 | Err : Node_Id := N; | |
996ae0b0 RK |
343 | |
344 | begin | |
345 | if Is_Overloaded (Opnd) then | |
346 | if Nkind (Opnd) in N_Op then | |
347 | Nam := Opnd; | |
84dad556 | 348 | |
996ae0b0 RK |
349 | elsif Nkind (Opnd) = N_Function_Call then |
350 | Nam := Name (Opnd); | |
84dad556 | 351 | |
44a10091 AC |
352 | elsif Ada_Version >= Ada_2012 then |
353 | declare | |
354 | It : Interp; | |
355 | I : Interp_Index; | |
356 | ||
357 | begin | |
358 | Get_First_Interp (Opnd, I, It); | |
359 | while Present (It.Nam) loop | |
360 | if Has_Implicit_Dereference (It.Typ) then | |
361 | Error_Msg_N | |
362 | ("can be interpreted as implicit dereference", Opnd); | |
363 | return; | |
364 | end if; | |
365 | ||
366 | Get_Next_Interp (I, It); | |
367 | end loop; | |
368 | end; | |
369 | ||
996ae0b0 RK |
370 | return; |
371 | end if; | |
372 | ||
373 | else | |
374 | return; | |
375 | end if; | |
376 | ||
377 | if Opnd = Left_Opnd (N) then | |
84dad556 AC |
378 | Error_Msg_N |
379 | ("\left operand has the following interpretations", N); | |
996ae0b0 | 380 | else |
ed2233dc | 381 | Error_Msg_N |
996ae0b0 RK |
382 | ("\right operand has the following interpretations", N); |
383 | Err := Opnd; | |
384 | end if; | |
385 | ||
fbf5a39b AC |
386 | List_Interps (Nam, Err); |
387 | end List_Operand_Interps; | |
996ae0b0 | 388 | |
4c46b835 AC |
389 | -- Start of processing for Ambiguous_Operands |
390 | ||
996ae0b0 | 391 | begin |
b67a385c | 392 | if Nkind (N) in N_Membership_Test then |
ed2233dc | 393 | Error_Msg_N ("ambiguous operands for membership", N); |
996ae0b0 | 394 | |
d469eabe | 395 | elsif Nkind_In (N, N_Op_Eq, N_Op_Ne) then |
ed2233dc | 396 | Error_Msg_N ("ambiguous operands for equality", N); |
996ae0b0 RK |
397 | |
398 | else | |
ed2233dc | 399 | Error_Msg_N ("ambiguous operands for comparison", N); |
996ae0b0 RK |
400 | end if; |
401 | ||
402 | if All_Errors_Mode then | |
fbf5a39b AC |
403 | List_Operand_Interps (Left_Opnd (N)); |
404 | List_Operand_Interps (Right_Opnd (N)); | |
996ae0b0 | 405 | else |
555360a5 | 406 | Error_Msg_N ("\use -gnatf switch for details", N); |
996ae0b0 RK |
407 | end if; |
408 | end Ambiguous_Operands; | |
409 | ||
410 | ----------------------- | |
411 | -- Analyze_Aggregate -- | |
412 | ----------------------- | |
413 | ||
d63199d8 PMR |
414 | -- Most of the analysis of Aggregates requires that the type be known, and |
415 | -- is therefore put off until resolution of the context. Delta aggregates | |
416 | -- have a base component that determines the enclosing aggregate type so | |
417 | -- its type can be ascertained earlier. This also allows delta aggregates | |
418 | -- to appear in the context of a record type with a private extension, as | |
419 | -- per the latest update of AI12-0127. | |
996ae0b0 RK |
420 | |
421 | procedure Analyze_Aggregate (N : Node_Id) is | |
422 | begin | |
423 | if No (Etype (N)) then | |
9ac3cbb3 PMR |
424 | if Nkind (N) = N_Delta_Aggregate then |
425 | declare | |
426 | Base : constant Node_Id := Expression (N); | |
d63199d8 | 427 | |
9ac3cbb3 PMR |
428 | I : Interp_Index; |
429 | It : Interp; | |
430 | ||
431 | begin | |
432 | Analyze (Base); | |
433 | ||
d63199d8 PMR |
434 | -- If the base is overloaded, propagate interpretations to the |
435 | -- enclosing aggregate. | |
9ac3cbb3 PMR |
436 | |
437 | if Is_Overloaded (Base) then | |
438 | Get_First_Interp (Base, I, It); | |
439 | Set_Etype (N, Any_Type); | |
440 | ||
441 | while Present (It.Nam) loop | |
442 | Add_One_Interp (N, It.Typ, It.Typ); | |
443 | Get_Next_Interp (I, It); | |
444 | end loop; | |
445 | ||
446 | else | |
447 | Set_Etype (N, Etype (Base)); | |
448 | end if; | |
449 | end; | |
450 | ||
451 | else | |
452 | Set_Etype (N, Any_Composite); | |
453 | end if; | |
996ae0b0 RK |
454 | end if; |
455 | end Analyze_Aggregate; | |
456 | ||
457 | ----------------------- | |
458 | -- Analyze_Allocator -- | |
459 | ----------------------- | |
460 | ||
461 | procedure Analyze_Allocator (N : Node_Id) is | |
462 | Loc : constant Source_Ptr := Sloc (N); | |
07fc65c4 | 463 | Sav_Errs : constant Nat := Serious_Errors_Detected; |
b67a385c | 464 | E : Node_Id := Expression (N); |
996ae0b0 RK |
465 | Acc_Type : Entity_Id; |
466 | Type_Id : Entity_Id; | |
87003b28 RD |
467 | P : Node_Id; |
468 | C : Node_Id; | |
b3b26ace | 469 | Onode : Node_Id; |
996ae0b0 RK |
470 | |
471 | begin | |
ce5ba43a | 472 | Check_SPARK_05_Restriction ("allocator is not allowed", N); |
1d801f21 | 473 | |
87003b28 RD |
474 | -- Deal with allocator restrictions |
475 | ||
50cff367 | 476 | -- In accordance with H.4(7), the No_Allocators restriction only applies |
87003b28 | 477 | -- to user-written allocators. The same consideration applies to the |
d8941160 | 478 | -- No_Standard_Allocators_Before_Elaboration restriction. |
50cff367 GD |
479 | |
480 | if Comes_From_Source (N) then | |
481 | Check_Restriction (No_Allocators, N); | |
87003b28 | 482 | |
57f4c288 | 483 | -- Processing for No_Standard_Allocators_After_Elaboration, loop to |
489c6e19 | 484 | -- look at enclosing context, checking task/main subprogram case. |
87003b28 RD |
485 | |
486 | C := N; | |
487 | P := Parent (C); | |
488 | while Present (P) loop | |
489 | ||
b3b26ace AC |
490 | -- For the task case we need a handled sequence of statements, |
491 | -- where the occurrence of the allocator is within the statements | |
492 | -- and the parent is a task body | |
87003b28 RD |
493 | |
494 | if Nkind (P) = N_Handled_Sequence_Of_Statements | |
495 | and then Is_List_Member (C) | |
496 | and then List_Containing (C) = Statements (P) | |
497 | then | |
b3b26ace AC |
498 | Onode := Original_Node (Parent (P)); |
499 | ||
87003b28 | 500 | -- Check for allocator within task body, this is a definite |
d8941160 RD |
501 | -- violation of No_Allocators_After_Elaboration we can detect |
502 | -- at compile time. | |
87003b28 | 503 | |
b3b26ace | 504 | if Nkind (Onode) = N_Task_Body then |
57f4c288 ES |
505 | Check_Restriction |
506 | (No_Standard_Allocators_After_Elaboration, N); | |
87003b28 RD |
507 | exit; |
508 | end if; | |
b3b26ace | 509 | end if; |
87003b28 | 510 | |
b3b26ace AC |
511 | -- The other case is appearance in a subprogram body. This is |
512 | -- a violation if this is a library level subprogram with no | |
513 | -- parameters. Note that this is now a static error even if the | |
514 | -- subprogram is not the main program (this is a change, in an | |
515 | -- earlier version only the main program was affected, and the | |
516 | -- check had to be done in the binder. | |
87003b28 | 517 | |
b3b26ace AC |
518 | if Nkind (P) = N_Subprogram_Body |
519 | and then Nkind (Parent (P)) = N_Compilation_Unit | |
520 | and then No (Parameter_Specifications (Specification (P))) | |
521 | then | |
522 | Check_Restriction | |
523 | (No_Standard_Allocators_After_Elaboration, N); | |
87003b28 RD |
524 | end if; |
525 | ||
526 | C := P; | |
527 | P := Parent (C); | |
528 | end loop; | |
50cff367 | 529 | end if; |
996ae0b0 | 530 | |
df170605 AC |
531 | -- Ada 2012 (AI05-0111-3): Analyze the subpool_specification, if |
532 | -- any. The expected type for the name is any type. A non-overloading | |
533 | -- rule then requires it to be of a type descended from | |
f0f88eb6 RD |
534 | -- System.Storage_Pools.Subpools.Subpool_Handle. |
535 | ||
536 | -- This isn't exactly what the AI says, but it seems to be the right | |
537 | -- rule. The AI should be fixed.??? | |
df170605 AC |
538 | |
539 | declare | |
540 | Subpool : constant Node_Id := Subpool_Handle_Name (N); | |
f0f88eb6 | 541 | |
df170605 AC |
542 | begin |
543 | if Present (Subpool) then | |
544 | Analyze (Subpool); | |
f0f88eb6 | 545 | |
df170605 AC |
546 | if Is_Overloaded (Subpool) then |
547 | Error_Msg_N ("ambiguous subpool handle", Subpool); | |
548 | end if; | |
549 | ||
f0f88eb6 | 550 | -- Check that Etype (Subpool) is descended from Subpool_Handle |
df170605 AC |
551 | |
552 | Resolve (Subpool); | |
553 | end if; | |
554 | end; | |
555 | ||
556 | -- Analyze the qualified expression or subtype indication | |
87003b28 | 557 | |
996ae0b0 RK |
558 | if Nkind (E) = N_Qualified_Expression then |
559 | Acc_Type := Create_Itype (E_Allocator_Type, N); | |
560 | Set_Etype (Acc_Type, Acc_Type); | |
996ae0b0 | 561 | Find_Type (Subtype_Mark (E)); |
45c8b94b ES |
562 | |
563 | -- Analyze the qualified expression, and apply the name resolution | |
f0f88eb6 | 564 | -- rule given in 4.7(3). |
45c8b94b ES |
565 | |
566 | Analyze (E); | |
567 | Type_Id := Etype (E); | |
996ae0b0 RK |
568 | Set_Directly_Designated_Type (Acc_Type, Type_Id); |
569 | ||
996ae0b0 RK |
570 | -- A qualified expression requires an exact match of the type, |
571 | -- class-wide matching is not allowed. | |
572 | ||
45c8b94b ES |
573 | -- if Is_Class_Wide_Type (Type_Id) |
574 | -- and then Base_Type | |
575 | -- (Etype (Expression (E))) /= Base_Type (Type_Id) | |
576 | -- then | |
577 | -- Wrong_Type (Expression (E), Type_Id); | |
578 | -- end if; | |
996ae0b0 | 579 | |
996ae0b0 | 580 | -- We don't analyze the qualified expression itself because it's |
f3691f46 ES |
581 | -- part of the allocator. It is fully analyzed and resolved when |
582 | -- the allocator is resolved with the context type. | |
996ae0b0 RK |
583 | |
584 | Set_Etype (E, Type_Id); | |
585 | ||
aab883ec | 586 | -- Case where allocator has a subtype indication |
4c46b835 | 587 | |
996ae0b0 RK |
588 | else |
589 | declare | |
758c442c GD |
590 | Def_Id : Entity_Id; |
591 | Base_Typ : Entity_Id; | |
996ae0b0 RK |
592 | |
593 | begin | |
594 | -- If the allocator includes a N_Subtype_Indication then a | |
595 | -- constraint is present, otherwise the node is a subtype mark. | |
596 | -- Introduce an explicit subtype declaration into the tree | |
597 | -- defining some anonymous subtype and rewrite the allocator to | |
598 | -- use this subtype rather than the subtype indication. | |
599 | ||
600 | -- It is important to introduce the explicit subtype declaration | |
601 | -- so that the bounds of the subtype indication are attached to | |
602 | -- the tree in case the allocator is inside a generic unit. | |
603 | ||
3ba1a9eb AC |
604 | -- Finally, if there is no subtype indication and the type is |
605 | -- a tagged unconstrained type with discriminants, the designated | |
606 | -- object is constrained by their default values, and it is | |
607 | -- simplest to introduce an explicit constraint now. In some cases | |
608 | -- this is done during expansion, but freeze actions are certain | |
609 | -- to be emitted in the proper order if constraint is explicit. | |
610 | ||
611 | if Is_Entity_Name (E) and then Expander_Active then | |
612 | Find_Type (E); | |
613 | Type_Id := Entity (E); | |
614 | ||
615 | if Is_Tagged_Type (Type_Id) | |
616 | and then Has_Discriminants (Type_Id) | |
617 | and then not Is_Constrained (Type_Id) | |
3702225c AC |
618 | and then |
619 | Present | |
620 | (Discriminant_Default_Value | |
621 | (First_Discriminant (Type_Id))) | |
3ba1a9eb AC |
622 | then |
623 | declare | |
3702225c | 624 | Constr : constant List_Id := New_List; |
3ba1a9eb AC |
625 | Loc : constant Source_Ptr := Sloc (E); |
626 | Discr : Entity_Id := First_Discriminant (Type_Id); | |
3ba1a9eb AC |
627 | |
628 | begin | |
629 | if Present (Discriminant_Default_Value (Discr)) then | |
630 | while Present (Discr) loop | |
631 | Append (Discriminant_Default_Value (Discr), Constr); | |
632 | Next_Discriminant (Discr); | |
633 | end loop; | |
634 | ||
3702225c AC |
635 | Rewrite (E, |
636 | Make_Subtype_Indication (Loc, | |
637 | Subtype_Mark => New_Occurrence_Of (Type_Id, Loc), | |
638 | Constraint => | |
639 | Make_Index_Or_Discriminant_Constraint (Loc, | |
640 | Constraints => Constr))); | |
3ba1a9eb AC |
641 | end if; |
642 | end; | |
643 | end if; | |
644 | end if; | |
645 | ||
996ae0b0 RK |
646 | if Nkind (E) = N_Subtype_Indication then |
647 | ||
648 | -- A constraint is only allowed for a composite type in Ada | |
649 | -- 95. In Ada 83, a constraint is also allowed for an | |
650 | -- access-to-composite type, but the constraint is ignored. | |
651 | ||
652 | Find_Type (Subtype_Mark (E)); | |
758c442c | 653 | Base_Typ := Entity (Subtype_Mark (E)); |
996ae0b0 | 654 | |
758c442c | 655 | if Is_Elementary_Type (Base_Typ) then |
0ab80019 | 656 | if not (Ada_Version = Ada_83 |
758c442c | 657 | and then Is_Access_Type (Base_Typ)) |
996ae0b0 RK |
658 | then |
659 | Error_Msg_N ("constraint not allowed here", E); | |
660 | ||
24657705 | 661 | if Nkind (Constraint (E)) = |
3702225c | 662 | N_Index_Or_Discriminant_Constraint |
996ae0b0 | 663 | then |
4e7a4f6e | 664 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
665 | ("\if qualified expression was meant, " & |
666 | "use apostrophe", Constraint (E)); | |
667 | end if; | |
668 | end if; | |
669 | ||
670 | -- Get rid of the bogus constraint: | |
671 | ||
672 | Rewrite (E, New_Copy_Tree (Subtype_Mark (E))); | |
673 | Analyze_Allocator (N); | |
674 | return; | |
675 | end if; | |
676 | ||
60c14ec7 ES |
677 | -- In GNATprove mode we need to preserve the link between |
678 | -- the original subtype indication and the anonymous subtype, | |
ebad47fc YM |
679 | -- to extend proofs to constrained acccess types. We only do |
680 | -- that outside of spec expressions, otherwise the declaration | |
681 | -- cannot be inserted and analyzed. In such a case, GNATprove | |
682 | -- later rejects the allocator as it is not used here in | |
683 | -- a non-interfering context (SPARK 4.8(2) and 7.1.3(12)). | |
684 | ||
685 | if Expander_Active | |
686 | or else (GNATprove_Mode and then not In_Spec_Expression) | |
687 | then | |
092ef350 | 688 | Def_Id := Make_Temporary (Loc, 'S'); |
996ae0b0 RK |
689 | |
690 | Insert_Action (E, | |
691 | Make_Subtype_Declaration (Loc, | |
692 | Defining_Identifier => Def_Id, | |
693 | Subtype_Indication => Relocate_Node (E))); | |
694 | ||
07fc65c4 | 695 | if Sav_Errs /= Serious_Errors_Detected |
d469eabe HK |
696 | and then Nkind (Constraint (E)) = |
697 | N_Index_Or_Discriminant_Constraint | |
996ae0b0 | 698 | then |
4e7a4f6e | 699 | Error_Msg_N -- CODEFIX |
a90bd866 RD |
700 | ("if qualified expression was meant, " |
701 | & "use apostrophe!", Constraint (E)); | |
996ae0b0 RK |
702 | end if; |
703 | ||
704 | E := New_Occurrence_Of (Def_Id, Loc); | |
705 | Rewrite (Expression (N), E); | |
706 | end if; | |
707 | end if; | |
708 | ||
709 | Type_Id := Process_Subtype (E, N); | |
710 | Acc_Type := Create_Itype (E_Allocator_Type, N); | |
84dad556 | 711 | Set_Etype (Acc_Type, Acc_Type); |
996ae0b0 RK |
712 | Set_Directly_Designated_Type (Acc_Type, Type_Id); |
713 | Check_Fully_Declared (Type_Id, N); | |
714 | ||
1baa4d2d | 715 | -- Ada 2005 (AI-231): If the designated type is itself an access |
16b05213 | 716 | -- type that excludes null, its default initialization will |
75ad5042 ES |
717 | -- be a null object, and we can insert an unconditional raise |
718 | -- before the allocator. | |
2820d220 | 719 | |
bfae1846 | 720 | -- Ada 2012 (AI-104): A not null indication here is altogether |
518ade91 AC |
721 | -- illegal. |
722 | ||
2820d220 | 723 | if Can_Never_Be_Null (Type_Id) then |
75ad5042 ES |
724 | declare |
725 | Not_Null_Check : constant Node_Id := | |
726 | Make_Raise_Constraint_Error (Sloc (E), | |
727 | Reason => CE_Null_Not_Allowed); | |
40b93859 | 728 | |
75ad5042 | 729 | begin |
7b55fea6 | 730 | if Expander_Active then |
75ad5042 ES |
731 | Insert_Action (N, Not_Null_Check); |
732 | Analyze (Not_Null_Check); | |
40b93859 | 733 | |
685bc70f AC |
734 | elsif Warn_On_Ada_2012_Compatibility then |
735 | Error_Msg_N | |
736 | ("null value not allowed here in Ada 2012?y?", E); | |
75ad5042 ES |
737 | end if; |
738 | end; | |
2820d220 AC |
739 | end if; |
740 | ||
996ae0b0 RK |
741 | -- Check for missing initialization. Skip this check if we already |
742 | -- had errors on analyzing the allocator, since in that case these | |
24657705 | 743 | -- are probably cascaded errors. |
996ae0b0 | 744 | |
83496138 | 745 | if not Is_Definite_Subtype (Type_Id) |
07fc65c4 | 746 | and then Serious_Errors_Detected = Sav_Errs |
996ae0b0 | 747 | then |
a4956515 AC |
748 | -- The build-in-place machinery may produce an allocator when |
749 | -- the designated type is indefinite but the underlying type is | |
750 | -- not. In this case the unknown discriminants are meaningless | |
751 | -- and should not trigger error messages. Check the parent node | |
752 | -- because the allocator is marked as coming from source. | |
753 | ||
754 | if Present (Underlying_Type (Type_Id)) | |
83496138 | 755 | and then Is_Definite_Subtype (Underlying_Type (Type_Id)) |
a4956515 AC |
756 | and then not Comes_From_Source (Parent (N)) |
757 | then | |
758 | null; | |
759 | ||
d43584ca AC |
760 | -- An unusual case arises when the parent of a derived type is |
761 | -- a limited record extension with unknown discriminants, and | |
762 | -- its full view has no discriminants. | |
763 | -- | |
764 | -- A more general fix might be to create the proper underlying | |
765 | -- type for such a derived type, but it is a record type with | |
766 | -- no private attributes, so this required extending the | |
767 | -- meaning of this attribute. ??? | |
768 | ||
769 | elsif Ekind (Etype (Type_Id)) = E_Record_Type_With_Private | |
770 | and then Present (Underlying_Type (Etype (Type_Id))) | |
771 | and then | |
772 | not Has_Discriminants (Underlying_Type (Etype (Type_Id))) | |
773 | and then not Comes_From_Source (Parent (N)) | |
774 | then | |
775 | null; | |
776 | ||
a4956515 | 777 | elsif Is_Class_Wide_Type (Type_Id) then |
996ae0b0 RK |
778 | Error_Msg_N |
779 | ("initialization required in class-wide allocation", N); | |
a4956515 | 780 | |
996ae0b0 | 781 | else |
0791fbe9 | 782 | if Ada_Version < Ada_2005 |
24657705 HK |
783 | and then Is_Limited_Type (Type_Id) |
784 | then | |
785 | Error_Msg_N ("unconstrained allocation not allowed", N); | |
786 | ||
787 | if Is_Array_Type (Type_Id) then | |
788 | Error_Msg_N | |
789 | ("\constraint with array bounds required", N); | |
790 | ||
791 | elsif Has_Unknown_Discriminants (Type_Id) then | |
792 | null; | |
793 | ||
794 | else pragma Assert (Has_Discriminants (Type_Id)); | |
795 | Error_Msg_N | |
796 | ("\constraint with discriminant values required", N); | |
797 | end if; | |
798 | ||
cf0e5ca7 BD |
799 | -- Limited Ada 2005 and general nonlimited case. |
800 | -- This is an error, except in the case of an | |
801 | -- uninitialized allocator that is generated | |
802 | -- for a build-in-place function return of a | |
803 | -- discriminated but compile-time-known-size | |
804 | -- type. | |
24657705 HK |
805 | |
806 | else | |
cf0e5ca7 BD |
807 | if Original_Node (N) /= N |
808 | and then Nkind (Original_Node (N)) = N_Allocator | |
809 | then | |
810 | declare | |
811 | Qual : constant Node_Id := | |
812 | Expression (Original_Node (N)); | |
813 | pragma Assert | |
814 | (Nkind (Qual) = N_Qualified_Expression); | |
815 | Call : constant Node_Id := Expression (Qual); | |
816 | pragma Assert | |
817 | (Is_Expanded_Build_In_Place_Call (Call)); | |
818 | begin | |
819 | null; | |
820 | end; | |
821 | ||
822 | else | |
24657705 | 823 | Error_Msg_N |
cf0e5ca7 BD |
824 | ("uninitialized unconstrained allocation not " |
825 | & "allowed", N); | |
826 | ||
827 | if Is_Array_Type (Type_Id) then | |
828 | Error_Msg_N | |
829 | ("\qualified expression or constraint with " | |
830 | & "array bounds required", N); | |
831 | ||
832 | elsif Has_Unknown_Discriminants (Type_Id) then | |
833 | Error_Msg_N ("\qualified expression required", N); | |
834 | ||
835 | else pragma Assert (Has_Discriminants (Type_Id)); | |
836 | Error_Msg_N | |
837 | ("\qualified expression or constraint with " | |
838 | & "discriminant values required", N); | |
839 | end if; | |
24657705 HK |
840 | end if; |
841 | end if; | |
996ae0b0 RK |
842 | end if; |
843 | end if; | |
844 | end; | |
845 | end if; | |
846 | ||
aab883ec | 847 | if Is_Abstract_Type (Type_Id) then |
996ae0b0 RK |
848 | Error_Msg_N ("cannot allocate abstract object", E); |
849 | end if; | |
850 | ||
851 | if Has_Task (Designated_Type (Acc_Type)) then | |
6e937c1c | 852 | Check_Restriction (No_Tasking, N); |
fbf5a39b | 853 | Check_Restriction (Max_Tasks, N); |
996ae0b0 | 854 | Check_Restriction (No_Task_Allocators, N); |
70b3b953 GD |
855 | end if; |
856 | ||
02bb0765 AC |
857 | -- Check restriction against dynamically allocated protected objects |
858 | ||
859 | if Has_Protected (Designated_Type (Acc_Type)) then | |
860 | Check_Restriction (No_Protected_Type_Allocators, N); | |
861 | end if; | |
862 | ||
646e2823 AC |
863 | -- AI05-0013-1: No_Nested_Finalization forbids allocators if the access |
864 | -- type is nested, and the designated type needs finalization. The rule | |
865 | -- is conservative in that class-wide types need finalization. | |
866 | ||
867 | if Needs_Finalization (Designated_Type (Acc_Type)) | |
868 | and then not Is_Library_Level_Entity (Acc_Type) | |
869 | then | |
870 | Check_Restriction (No_Nested_Finalization, N); | |
871 | end if; | |
872 | ||
70b3b953 GD |
873 | -- Check that an allocator of a nested access type doesn't create a |
874 | -- protected object when restriction No_Local_Protected_Objects applies. | |
70b3b953 | 875 | |
96e90ac1 | 876 | if Has_Protected (Designated_Type (Acc_Type)) |
70b3b953 GD |
877 | and then not Is_Library_Level_Entity (Acc_Type) |
878 | then | |
879 | Check_Restriction (No_Local_Protected_Objects, N); | |
996ae0b0 RK |
880 | end if; |
881 | ||
4969efdf AC |
882 | -- Likewise for No_Local_Timing_Events |
883 | ||
884 | if Has_Timing_Event (Designated_Type (Acc_Type)) | |
885 | and then not Is_Library_Level_Entity (Acc_Type) | |
886 | then | |
887 | Check_Restriction (No_Local_Timing_Events, N); | |
888 | end if; | |
889 | ||
ffe9aba8 AC |
890 | -- If the No_Streams restriction is set, check that the type of the |
891 | -- object is not, and does not contain, any subtype derived from | |
892 | -- Ada.Streams.Root_Stream_Type. Note that we guard the call to | |
893 | -- Has_Stream just for efficiency reasons. There is no point in | |
894 | -- spending time on a Has_Stream check if the restriction is not set. | |
895 | ||
7a963087 | 896 | if Restriction_Check_Required (No_Streams) then |
ffe9aba8 AC |
897 | if Has_Stream (Designated_Type (Acc_Type)) then |
898 | Check_Restriction (No_Streams, N); | |
899 | end if; | |
900 | end if; | |
901 | ||
996ae0b0 RK |
902 | Set_Etype (N, Acc_Type); |
903 | ||
904 | if not Is_Library_Level_Entity (Acc_Type) then | |
905 | Check_Restriction (No_Local_Allocators, N); | |
906 | end if; | |
2820d220 | 907 | |
07fc65c4 | 908 | if Serious_Errors_Detected > Sav_Errs then |
996ae0b0 RK |
909 | Set_Error_Posted (N); |
910 | Set_Etype (N, Any_Type); | |
911 | end if; | |
996ae0b0 RK |
912 | end Analyze_Allocator; |
913 | ||
914 | --------------------------- | |
915 | -- Analyze_Arithmetic_Op -- | |
916 | --------------------------- | |
917 | ||
918 | procedure Analyze_Arithmetic_Op (N : Node_Id) is | |
919 | L : constant Node_Id := Left_Opnd (N); | |
920 | R : constant Node_Id := Right_Opnd (N); | |
921 | Op_Id : Entity_Id; | |
922 | ||
923 | begin | |
924 | Candidate_Type := Empty; | |
925 | Analyze_Expression (L); | |
926 | Analyze_Expression (R); | |
927 | ||
d469eabe HK |
928 | -- If the entity is already set, the node is the instantiation of a |
929 | -- generic node with a non-local reference, or was manufactured by a | |
930 | -- call to Make_Op_xxx. In either case the entity is known to be valid, | |
931 | -- and we do not need to collect interpretations, instead we just get | |
932 | -- the single possible interpretation. | |
996ae0b0 RK |
933 | |
934 | Op_Id := Entity (N); | |
935 | ||
936 | if Present (Op_Id) then | |
937 | if Ekind (Op_Id) = E_Operator then | |
938 | ||
d469eabe | 939 | if Nkind_In (N, N_Op_Divide, N_Op_Mod, N_Op_Multiply, N_Op_Rem) |
996ae0b0 RK |
940 | and then Treat_Fixed_As_Integer (N) |
941 | then | |
942 | null; | |
943 | else | |
944 | Set_Etype (N, Any_Type); | |
945 | Find_Arithmetic_Types (L, R, Op_Id, N); | |
946 | end if; | |
947 | ||
948 | else | |
949 | Set_Etype (N, Any_Type); | |
950 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
951 | end if; | |
952 | ||
953 | -- Entity is not already set, so we do need to collect interpretations | |
954 | ||
955 | else | |
996ae0b0 RK |
956 | Set_Etype (N, Any_Type); |
957 | ||
84dad556 | 958 | Op_Id := Get_Name_Entity_Id (Chars (N)); |
996ae0b0 RK |
959 | while Present (Op_Id) loop |
960 | if Ekind (Op_Id) = E_Operator | |
961 | and then Present (Next_Entity (First_Entity (Op_Id))) | |
962 | then | |
963 | Find_Arithmetic_Types (L, R, Op_Id, N); | |
964 | ||
965 | -- The following may seem superfluous, because an operator cannot | |
966 | -- be generic, but this ignores the cleverness of the author of | |
967 | -- ACVC bc1013a. | |
968 | ||
969 | elsif Is_Overloadable (Op_Id) then | |
970 | Analyze_User_Defined_Binary_Op (N, Op_Id); | |
971 | end if; | |
972 | ||
973 | Op_Id := Homonym (Op_Id); | |
974 | end loop; | |
975 | end if; | |
976 | ||
977 | Operator_Check (N); | |
22e89283 | 978 | Check_Function_Writable_Actuals (N); |
996ae0b0 RK |
979 | end Analyze_Arithmetic_Op; |
980 | ||
981 | ------------------ | |
982 | -- Analyze_Call -- | |
983 | ------------------ | |
984 | ||
4c46b835 AC |
985 | -- Function, procedure, and entry calls are checked here. The Name in |
986 | -- the call may be overloaded. The actuals have been analyzed and may | |
987 | -- themselves be overloaded. On exit from this procedure, the node N | |
988 | -- may have zero, one or more interpretations. In the first case an | |
989 | -- error message is produced. In the last case, the node is flagged | |
990 | -- as overloaded and the interpretations are collected in All_Interp. | |
996ae0b0 RK |
991 | |
992 | -- If the name is an Access_To_Subprogram, it cannot be overloaded, but | |
993 | -- the type-checking is similar to that of other calls. | |
994 | ||
995 | procedure Analyze_Call (N : Node_Id) is | |
4f324de2 | 996 | Actuals : constant List_Id := Parameter_Associations (N); |
f4ef7b06 | 997 | Loc : constant Source_Ptr := Sloc (N); |
63319f58 | 998 | Nam : Node_Id; |
996ae0b0 RK |
999 | X : Interp_Index; |
1000 | It : Interp; | |
1001 | Nam_Ent : Entity_Id; | |
63319f58 RD |
1002 | Success : Boolean := False; |
1003 | ||
1004 | Deref : Boolean := False; | |
1cb17b78 AC |
1005 | -- Flag indicates whether an interpretation of the prefix is a |
1006 | -- parameterless call that returns an access_to_subprogram. | |
996ae0b0 | 1007 | |
23685ae6 AC |
1008 | procedure Check_Mixed_Parameter_And_Named_Associations; |
1009 | -- Check that parameter and named associations are not mixed. This is | |
1010 | -- a restriction in SPARK mode. | |
1011 | ||
288cbbbd JM |
1012 | procedure Check_Writable_Actuals (N : Node_Id); |
1013 | -- If the call has out or in-out parameters then mark its outermost | |
1014 | -- enclosing construct as a node on which the writable actuals check | |
1015 | -- must be performed. | |
1016 | ||
996ae0b0 | 1017 | function Name_Denotes_Function return Boolean; |
5ff22245 ES |
1018 | -- If the type of the name is an access to subprogram, this may be the |
1019 | -- type of a name, or the return type of the function being called. If | |
1020 | -- the name is not an entity then it can denote a protected function. | |
1021 | -- Until we distinguish Etype from Return_Type, we must use this routine | |
1022 | -- to resolve the meaning of the name in the call. | |
1023 | ||
1024 | procedure No_Interpretation; | |
1025 | -- Output error message when no valid interpretation exists | |
996ae0b0 | 1026 | |
23685ae6 AC |
1027 | -------------------------------------------------- |
1028 | -- Check_Mixed_Parameter_And_Named_Associations -- | |
1029 | -------------------------------------------------- | |
1030 | ||
1031 | procedure Check_Mixed_Parameter_And_Named_Associations is | |
1032 | Actual : Node_Id; | |
1033 | Named_Seen : Boolean; | |
f5afb270 | 1034 | |
23685ae6 | 1035 | begin |
23685ae6 | 1036 | Named_Seen := False; |
f5afb270 AC |
1037 | |
1038 | Actual := First (Actuals); | |
23685ae6 AC |
1039 | while Present (Actual) loop |
1040 | case Nkind (Actual) is | |
1041 | when N_Parameter_Association => | |
1042 | if Named_Seen then | |
ce5ba43a | 1043 | Check_SPARK_05_Restriction |
23685ae6 AC |
1044 | ("named association cannot follow positional one", |
1045 | Actual); | |
1046 | exit; | |
1047 | end if; | |
84dad556 | 1048 | |
23685ae6 AC |
1049 | when others => |
1050 | Named_Seen := True; | |
1051 | end case; | |
1052 | ||
1053 | Next (Actual); | |
1054 | end loop; | |
1055 | end Check_Mixed_Parameter_And_Named_Associations; | |
1056 | ||
288cbbbd JM |
1057 | ---------------------------- |
1058 | -- Check_Writable_Actuals -- | |
1059 | ---------------------------- | |
1060 | ||
1061 | -- The identification of conflicts in calls to functions with writable | |
551e1935 | 1062 | -- actuals is performed in the analysis phase of the front end to ensure |
288cbbbd JM |
1063 | -- that it reports exactly the same errors compiling with and without |
1064 | -- expansion enabled. It is performed in two stages: | |
1065 | ||
551e1935 AC |
1066 | -- 1) When a call to a function with out-mode parameters is found, |
1067 | -- we climb to the outermost enclosing construct that can be | |
288cbbbd JM |
1068 | -- evaluated in arbitrary order and we mark it with the flag |
1069 | -- Check_Actuals. | |
1070 | ||
551e1935 AC |
1071 | -- 2) When the analysis of the marked node is complete, we traverse |
1072 | -- its decorated subtree searching for conflicts (see function | |
1073 | -- Sem_Util.Check_Function_Writable_Actuals). | |
288cbbbd | 1074 | |
551e1935 AC |
1075 | -- The unique exception to this general rule is for aggregates, since |
1076 | -- their analysis is performed by the front end in the resolution | |
1077 | -- phase. For aggregates we do not climb to their enclosing construct: | |
288cbbbd JM |
1078 | -- we restrict the analysis to the subexpressions initializing the |
1079 | -- aggregate components. | |
1080 | ||
1081 | -- This implies that the analysis of expressions containing aggregates | |
551e1935 | 1082 | -- is not complete, since there may be conflicts on writable actuals |
288cbbbd JM |
1083 | -- involving subexpressions of the enclosing logical or arithmetic |
1084 | -- expressions. However, we cannot wait and perform the analysis when | |
551e1935 | 1085 | -- the whole subtree is resolved, since the subtrees may be transformed, |
288cbbbd JM |
1086 | -- thus adding extra complexity and computation cost to identify and |
1087 | -- report exactly the same errors compiling with and without expansion | |
1088 | -- enabled. | |
1089 | ||
1090 | procedure Check_Writable_Actuals (N : Node_Id) is | |
288cbbbd JM |
1091 | begin |
1092 | if Comes_From_Source (N) | |
1093 | and then Present (Get_Subprogram_Entity (N)) | |
1094 | and then Has_Out_Or_In_Out_Parameter (Get_Subprogram_Entity (N)) | |
1095 | then | |
1096 | -- For procedures and entries there is no need to climb since | |
1097 | -- we only need to check if the actuals of this call invoke | |
1098 | -- functions whose out-mode parameters overlap. | |
1099 | ||
1100 | if Nkind (N) /= N_Function_Call then | |
1101 | Set_Check_Actuals (N); | |
1102 | ||
1103 | -- For calls to functions we climb to the outermost enclosing | |
1104 | -- construct where the out-mode actuals of this function may | |
1105 | -- introduce conflicts. | |
1106 | ||
1107 | else | |
1108 | declare | |
5612989e | 1109 | Outermost : Node_Id := Empty; -- init to avoid warning |
288cbbbd JM |
1110 | P : Node_Id := N; |
1111 | ||
1112 | begin | |
1113 | while Present (P) loop | |
551e1935 | 1114 | -- For object declarations we can climb to the node from |
288cbbbd JM |
1115 | -- its object definition branch or from its initializing |
1116 | -- expression. We prefer to mark the child node as the | |
1117 | -- outermost construct to avoid adding further complexity | |
551e1935 | 1118 | -- to the routine that will later take care of |
288cbbbd JM |
1119 | -- performing the writable actuals check. |
1120 | ||
22e89283 AC |
1121 | if Has_Arbitrary_Evaluation_Order (Nkind (P)) |
1122 | and then not Nkind_In (P, N_Assignment_Statement, | |
1123 | N_Object_Declaration) | |
288cbbbd JM |
1124 | then |
1125 | Outermost := P; | |
1126 | end if; | |
1127 | ||
5612989e | 1128 | -- Avoid climbing more than needed |
288cbbbd | 1129 | |
22e89283 | 1130 | exit when Stop_Subtree_Climbing (Nkind (P)) |
288cbbbd JM |
1131 | or else (Nkind (P) = N_Range |
1132 | and then not | |
22e89283 | 1133 | Nkind_In (Parent (P), N_In, N_Not_In)); |
288cbbbd JM |
1134 | |
1135 | P := Parent (P); | |
1136 | end loop; | |
1137 | ||
1138 | Set_Check_Actuals (Outermost); | |
1139 | end; | |
1140 | end if; | |
1141 | end if; | |
1142 | end Check_Writable_Actuals; | |
1143 | ||
996ae0b0 RK |
1144 | --------------------------- |
1145 | -- Name_Denotes_Function -- | |
1146 | --------------------------- | |
1147 | ||
1148 | function Name_Denotes_Function return Boolean is | |
1149 | begin | |
1150 | if Is_Entity_Name (Nam) then | |
1151 | return Ekind (Entity (Nam)) = E_Function; | |
996ae0b0 RK |
1152 | elsif Nkind (Nam) = N_Selected_Component then |
1153 | return Ekind (Entity (Selector_Name (Nam))) = E_Function; | |
996ae0b0 RK |
1154 | else |
1155 | return False; | |
1156 | end if; | |
1157 | end Name_Denotes_Function; | |
1158 | ||
5ff22245 ES |
1159 | ----------------------- |
1160 | -- No_Interpretation -- | |
1161 | ----------------------- | |
1162 | ||
1163 | procedure No_Interpretation is | |
1164 | L : constant Boolean := Is_List_Member (N); | |
1165 | K : constant Node_Kind := Nkind (Parent (N)); | |
1166 | ||
1167 | begin | |
1168 | -- If the node is in a list whose parent is not an expression then it | |
1169 | -- must be an attempted procedure call. | |
1170 | ||
1171 | if L and then K not in N_Subexpr then | |
1172 | if Ekind (Entity (Nam)) = E_Generic_Procedure then | |
1173 | Error_Msg_NE | |
1174 | ("must instantiate generic procedure& before call", | |
1175 | Nam, Entity (Nam)); | |
1176 | else | |
84dad556 | 1177 | Error_Msg_N ("procedure or entry name expected", Nam); |
5ff22245 ES |
1178 | end if; |
1179 | ||
1180 | -- Check for tasking cases where only an entry call will do | |
1181 | ||
1182 | elsif not L | |
1183 | and then Nkind_In (K, N_Entry_Call_Alternative, | |
1184 | N_Triggering_Alternative) | |
1185 | then | |
1186 | Error_Msg_N ("entry name expected", Nam); | |
1187 | ||
1188 | -- Otherwise give general error message | |
1189 | ||
1190 | else | |
1191 | Error_Msg_N ("invalid prefix in call", Nam); | |
1192 | end if; | |
1193 | end No_Interpretation; | |
1194 | ||
996ae0b0 RK |
1195 | -- Start of processing for Analyze_Call |
1196 | ||
1197 | begin | |
6480338a | 1198 | if Restriction_Check_Required (SPARK_05) then |
23685ae6 AC |
1199 | Check_Mixed_Parameter_And_Named_Associations; |
1200 | end if; | |
1201 | ||
996ae0b0 RK |
1202 | -- Initialize the type of the result of the call to the error type, |
1203 | -- which will be reset if the type is successfully resolved. | |
1204 | ||
1205 | Set_Etype (N, Any_Type); | |
1206 | ||
63319f58 RD |
1207 | Nam := Name (N); |
1208 | ||
996ae0b0 RK |
1209 | if not Is_Overloaded (Nam) then |
1210 | ||
1211 | -- Only one interpretation to check | |
1212 | ||
1213 | if Ekind (Etype (Nam)) = E_Subprogram_Type then | |
1214 | Nam_Ent := Etype (Nam); | |
1215 | ||
758c442c GD |
1216 | -- If the prefix is an access_to_subprogram, this may be an indirect |
1217 | -- call. This is the case if the name in the call is not an entity | |
1218 | -- name, or if it is a function name in the context of a procedure | |
1219 | -- call. In this latter case, we have a call to a parameterless | |
1220 | -- function that returns a pointer_to_procedure which is the entity | |
5ff22245 ES |
1221 | -- being called. Finally, F (X) may be a call to a parameterless |
1222 | -- function that returns a pointer to a function with parameters. | |
80e59506 | 1223 | -- Note that if F returns an access-to-subprogram whose designated |
4bb9c7b9 AC |
1224 | -- type is an array, F (X) cannot be interpreted as an indirect call |
1225 | -- through the result of the call to F. | |
758c442c | 1226 | |
996ae0b0 RK |
1227 | elsif Is_Access_Type (Etype (Nam)) |
1228 | and then Ekind (Designated_Type (Etype (Nam))) = E_Subprogram_Type | |
758c442c GD |
1229 | and then |
1230 | (not Name_Denotes_Function | |
b2834fbd AC |
1231 | or else Nkind (N) = N_Procedure_Call_Statement |
1232 | or else | |
1233 | (Nkind (Parent (N)) /= N_Explicit_Dereference | |
1234 | and then Is_Entity_Name (Nam) | |
1235 | and then No (First_Formal (Entity (Nam))) | |
1236 | and then not | |
1237 | Is_Array_Type (Etype (Designated_Type (Etype (Nam)))) | |
1238 | and then Present (Actuals))) | |
996ae0b0 RK |
1239 | then |
1240 | Nam_Ent := Designated_Type (Etype (Nam)); | |
1241 | Insert_Explicit_Dereference (Nam); | |
1242 | ||
1243 | -- Selected component case. Simple entry or protected operation, | |
1244 | -- where the entry name is given by the selector name. | |
1245 | ||
1246 | elsif Nkind (Nam) = N_Selected_Component then | |
1247 | Nam_Ent := Entity (Selector_Name (Nam)); | |
1248 | ||
bce79204 AC |
1249 | if not Ekind_In (Nam_Ent, E_Entry, |
1250 | E_Entry_Family, | |
1251 | E_Function, | |
1252 | E_Procedure) | |
996ae0b0 RK |
1253 | then |
1254 | Error_Msg_N ("name in call is not a callable entity", Nam); | |
1255 | Set_Etype (N, Any_Type); | |
1256 | return; | |
1257 | end if; | |
1258 | ||
1259 | -- If the name is an Indexed component, it can be a call to a member | |
1260 | -- of an entry family. The prefix must be a selected component whose | |
1261 | -- selector is the entry. Analyze_Procedure_Call normalizes several | |
1262 | -- kinds of call into this form. | |
1263 | ||
1264 | elsif Nkind (Nam) = N_Indexed_Component then | |
996ae0b0 RK |
1265 | if Nkind (Prefix (Nam)) = N_Selected_Component then |
1266 | Nam_Ent := Entity (Selector_Name (Prefix (Nam))); | |
996ae0b0 RK |
1267 | else |
1268 | Error_Msg_N ("name in call is not a callable entity", Nam); | |
1269 | Set_Etype (N, Any_Type); | |
1270 | return; | |
996ae0b0 RK |
1271 | end if; |
1272 | ||
1273 | elsif not Is_Entity_Name (Nam) then | |
1274 | Error_Msg_N ("name in call is not a callable entity", Nam); | |
1275 | Set_Etype (N, Any_Type); | |
1276 | return; | |
1277 | ||
1278 | else | |
1279 | Nam_Ent := Entity (Nam); | |
1280 | ||
5f50020a ES |
1281 | -- If not overloadable, this may be a generalized indexing |
1282 | -- operation with named associations. Rewrite again as an | |
1283 | -- indexed component and analyze as container indexing. | |
996ae0b0 RK |
1284 | |
1285 | if not Is_Overloadable (Nam_Ent) then | |
32bba3c9 AC |
1286 | if Present |
1287 | (Find_Value_Of_Aspect | |
1288 | (Etype (Nam_Ent), Aspect_Constant_Indexing)) | |
5f50020a ES |
1289 | then |
1290 | Replace (N, | |
1291 | Make_Indexed_Component (Sloc (N), | |
32bba3c9 | 1292 | Prefix => Nam, |
5f50020a ES |
1293 | Expressions => Parameter_Associations (N))); |
1294 | ||
1295 | if Try_Container_Indexing (N, Nam, Expressions (N)) then | |
1296 | return; | |
1297 | else | |
1298 | No_Interpretation; | |
1299 | end if; | |
1300 | ||
1301 | else | |
1302 | No_Interpretation; | |
1303 | end if; | |
32bba3c9 | 1304 | |
5ff22245 ES |
1305 | return; |
1306 | end if; | |
1307 | end if; | |
996ae0b0 | 1308 | |
5ff22245 ES |
1309 | -- Operations generated for RACW stub types are called only through |
1310 | -- dispatching, and can never be the static interpretation of a call. | |
996ae0b0 | 1311 | |
5ff22245 ES |
1312 | if Is_RACW_Stub_Type_Operation (Nam_Ent) then |
1313 | No_Interpretation; | |
1314 | return; | |
996ae0b0 RK |
1315 | end if; |
1316 | ||
1317 | Analyze_One_Call (N, Nam_Ent, True, Success); | |
1318 | ||
ec6078e3 ES |
1319 | -- If this is an indirect call, the return type of the access_to |
1320 | -- subprogram may be an incomplete type. At the point of the call, | |
947430d5 AC |
1321 | -- use the full type if available, and at the same time update the |
1322 | -- return type of the access_to_subprogram. | |
ec6078e3 ES |
1323 | |
1324 | if Success | |
d469eabe | 1325 | and then Nkind (Nam) = N_Explicit_Dereference |
ec6078e3 ES |
1326 | and then Ekind (Etype (N)) = E_Incomplete_Type |
1327 | and then Present (Full_View (Etype (N))) | |
1328 | then | |
1329 | Set_Etype (N, Full_View (Etype (N))); | |
1330 | Set_Etype (Nam_Ent, Etype (N)); | |
1331 | end if; | |
1332 | ||
a7e68e7f HK |
1333 | -- Overloaded call |
1334 | ||
996ae0b0 | 1335 | else |
5ff22245 ES |
1336 | -- An overloaded selected component must denote overloaded operations |
1337 | -- of a concurrent type. The interpretations are attached to the | |
1338 | -- simple name of those operations. | |
996ae0b0 RK |
1339 | |
1340 | if Nkind (Nam) = N_Selected_Component then | |
1341 | Nam := Selector_Name (Nam); | |
1342 | end if; | |
1343 | ||
1344 | Get_First_Interp (Nam, X, It); | |
996ae0b0 RK |
1345 | while Present (It.Nam) loop |
1346 | Nam_Ent := It.Nam; | |
1cb17b78 | 1347 | Deref := False; |
996ae0b0 RK |
1348 | |
1349 | -- Name may be call that returns an access to subprogram, or more | |
1350 | -- generally an overloaded expression one of whose interpretations | |
947430d5 AC |
1351 | -- yields an access to subprogram. If the name is an entity, we do |
1352 | -- not dereference, because the node is a call that returns the | |
1353 | -- access type: note difference between f(x), where the call may | |
1354 | -- return an access subprogram type, and f(x)(y), where the type | |
1355 | -- returned by the call to f is implicitly dereferenced to analyze | |
1356 | -- the outer call. | |
996ae0b0 RK |
1357 | |
1358 | if Is_Access_Type (Nam_Ent) then | |
1359 | Nam_Ent := Designated_Type (Nam_Ent); | |
1360 | ||
1361 | elsif Is_Access_Type (Etype (Nam_Ent)) | |
1cb17b78 AC |
1362 | and then |
1363 | (not Is_Entity_Name (Nam) | |
1364 | or else Nkind (N) = N_Procedure_Call_Statement) | |
996ae0b0 RK |
1365 | and then Ekind (Designated_Type (Etype (Nam_Ent))) |
1366 | = E_Subprogram_Type | |
1367 | then | |
1368 | Nam_Ent := Designated_Type (Etype (Nam_Ent)); | |
1cb17b78 AC |
1369 | |
1370 | if Is_Entity_Name (Nam) then | |
1371 | Deref := True; | |
1372 | end if; | |
996ae0b0 RK |
1373 | end if; |
1374 | ||
7415029d AC |
1375 | -- If the call has been rewritten from a prefixed call, the first |
1376 | -- parameter has been analyzed, but may need a subsequent | |
1377 | -- dereference, so skip its analysis now. | |
1378 | ||
dc67cfea | 1379 | if Is_Rewrite_Substitution (N) |
7415029d AC |
1380 | and then Nkind (Original_Node (N)) = Nkind (N) |
1381 | and then Nkind (Name (N)) /= Nkind (Name (Original_Node (N))) | |
1382 | and then Present (Parameter_Associations (N)) | |
1383 | and then Present (Etype (First (Parameter_Associations (N)))) | |
1384 | then | |
1385 | Analyze_One_Call | |
1386 | (N, Nam_Ent, False, Success, Skip_First => True); | |
1387 | else | |
1388 | Analyze_One_Call (N, Nam_Ent, False, Success); | |
1389 | end if; | |
996ae0b0 RK |
1390 | |
1391 | -- If the interpretation succeeds, mark the proper type of the | |
1392 | -- prefix (any valid candidate will do). If not, remove the | |
f4ef7b06 AC |
1393 | -- candidate interpretation. If this is a parameterless call |
1394 | -- on an anonymous access to subprogram, X is a variable with | |
1395 | -- an access discriminant D, the entity in the interpretation is | |
1396 | -- D, so rewrite X as X.D.all. | |
996ae0b0 RK |
1397 | |
1398 | if Success then | |
1cb17b78 AC |
1399 | if Deref |
1400 | and then Nkind (Parent (N)) /= N_Explicit_Dereference | |
1401 | then | |
f4ef7b06 AC |
1402 | if Ekind (It.Nam) = E_Discriminant |
1403 | and then Has_Implicit_Dereference (It.Nam) | |
1404 | then | |
1405 | Rewrite (Name (N), | |
1406 | Make_Explicit_Dereference (Loc, | |
4f324de2 AC |
1407 | Prefix => |
1408 | Make_Selected_Component (Loc, | |
1409 | Prefix => | |
1410 | New_Occurrence_Of (Entity (Nam), Loc), | |
1411 | Selector_Name => | |
1412 | New_Occurrence_Of (It.Nam, Loc)))); | |
1413 | ||
f4ef7b06 AC |
1414 | Analyze (N); |
1415 | return; | |
1416 | ||
1417 | else | |
1418 | Set_Entity (Nam, It.Nam); | |
1419 | Insert_Explicit_Dereference (Nam); | |
1420 | Set_Etype (Nam, Nam_Ent); | |
1421 | end if; | |
1cb17b78 AC |
1422 | |
1423 | else | |
1424 | Set_Etype (Nam, It.Typ); | |
1425 | end if; | |
996ae0b0 | 1426 | |
4f324de2 | 1427 | elsif Nkind_In (Name (N), N_Function_Call, N_Selected_Component) |
fbf5a39b | 1428 | then |
996ae0b0 RK |
1429 | Remove_Interp (X); |
1430 | end if; | |
1431 | ||
1432 | Get_Next_Interp (X, It); | |
1433 | end loop; | |
1434 | ||
a7e68e7f HK |
1435 | -- If the name is the result of a function call, it can only be a |
1436 | -- call to a function returning an access to subprogram. Insert | |
1437 | -- explicit dereference. | |
996ae0b0 RK |
1438 | |
1439 | if Nkind (Nam) = N_Function_Call then | |
1440 | Insert_Explicit_Dereference (Nam); | |
1441 | end if; | |
1442 | ||
1443 | if Etype (N) = Any_Type then | |
1444 | ||
1445 | -- None of the interpretations is compatible with the actuals | |
1446 | ||
1447 | Diagnose_Call (N, Nam); | |
1448 | ||
1449 | -- Special checks for uninstantiated put routines | |
1450 | ||
1451 | if Nkind (N) = N_Procedure_Call_Statement | |
1452 | and then Is_Entity_Name (Nam) | |
1453 | and then Chars (Nam) = Name_Put | |
1454 | and then List_Length (Actuals) = 1 | |
1455 | then | |
1456 | declare | |
1457 | Arg : constant Node_Id := First (Actuals); | |
1458 | Typ : Entity_Id; | |
1459 | ||
1460 | begin | |
1461 | if Nkind (Arg) = N_Parameter_Association then | |
1462 | Typ := Etype (Explicit_Actual_Parameter (Arg)); | |
1463 | else | |
1464 | Typ := Etype (Arg); | |
1465 | end if; | |
1466 | ||
1467 | if Is_Signed_Integer_Type (Typ) then | |
1468 | Error_Msg_N | |
a90bd866 RD |
1469 | ("possible missing instantiation of " |
1470 | & "'Text_'I'O.'Integer_'I'O!", Nam); | |
996ae0b0 RK |
1471 | |
1472 | elsif Is_Modular_Integer_Type (Typ) then | |
1473 | Error_Msg_N | |
a90bd866 RD |
1474 | ("possible missing instantiation of " |
1475 | & "'Text_'I'O.'Modular_'I'O!", Nam); | |
996ae0b0 RK |
1476 | |
1477 | elsif Is_Floating_Point_Type (Typ) then | |
1478 | Error_Msg_N | |
a90bd866 RD |
1479 | ("possible missing instantiation of " |
1480 | & "'Text_'I'O.'Float_'I'O!", Nam); | |
996ae0b0 RK |
1481 | |
1482 | elsif Is_Ordinary_Fixed_Point_Type (Typ) then | |
1483 | Error_Msg_N | |
a90bd866 RD |
1484 | ("possible missing instantiation of " |
1485 | & "'Text_'I'O.'Fixed_'I'O!", Nam); | |
996ae0b0 RK |
1486 | |
1487 | elsif Is_Decimal_Fixed_Point_Type (Typ) then | |
1488 | Error_Msg_N | |
a90bd866 RD |
1489 | ("possible missing instantiation of " |
1490 | & "'Text_'I'O.'Decimal_'I'O!", Nam); | |
996ae0b0 RK |
1491 | |
1492 | elsif Is_Enumeration_Type (Typ) then | |
1493 | Error_Msg_N | |
a90bd866 RD |
1494 | ("possible missing instantiation of " |
1495 | & "'Text_'I'O.'Enumeration_'I'O!", Nam); | |
996ae0b0 RK |
1496 | end if; |
1497 | end; | |
1498 | end if; | |
1499 | ||
1500 | elsif not Is_Overloaded (N) | |
1501 | and then Is_Entity_Name (Nam) | |
1502 | then | |
aab883ec ES |
1503 | -- Resolution yields a single interpretation. Verify that the |
1504 | -- reference has capitalization consistent with the declaration. | |
996ae0b0 | 1505 | |
e7ba564f | 1506 | Set_Entity_With_Checks (Nam, Entity (Nam)); |
996ae0b0 RK |
1507 | Generate_Reference (Entity (Nam), Nam); |
1508 | ||
1509 | Set_Etype (Nam, Etype (Entity (Nam))); | |
30c20106 AC |
1510 | else |
1511 | Remove_Abstract_Operations (N); | |
996ae0b0 RK |
1512 | end if; |
1513 | ||
1514 | End_Interp_List; | |
1515 | end if; | |
288cbbbd JM |
1516 | |
1517 | if Ada_Version >= Ada_2012 then | |
1518 | ||
1519 | -- Check if the call contains a function with writable actuals | |
1520 | ||
1521 | Check_Writable_Actuals (N); | |
1522 | ||
551e1935 AC |
1523 | -- If found and the outermost construct that can be evaluated in |
1524 | -- an arbitrary order is precisely this call, then check all its | |
288cbbbd JM |
1525 | -- actuals. |
1526 | ||
22e89283 | 1527 | Check_Function_Writable_Actuals (N); |
b63d61f7 AC |
1528 | |
1529 | -- The return type of the function may be incomplete. This can be | |
1530 | -- the case if the type is a generic formal, or a limited view. It | |
1531 | -- can also happen when the function declaration appears before the | |
1532 | -- full view of the type (which is legal in Ada 2012) and the call | |
1533 | -- appears in a different unit, in which case the incomplete view | |
a316b3fc | 1534 | -- must be replaced with the full view (or the nonlimited view) |
d3271136 EB |
1535 | -- to prevent subsequent type errors. Note that the usual install/ |
1536 | -- removal of limited_with clauses is not sufficient to handle this | |
a316b3fc | 1537 | -- case, because the limited view may have been captured in another |
d3271136 EB |
1538 | -- compilation unit that defines the current function. |
1539 | ||
1540 | if Is_Incomplete_Type (Etype (N)) then | |
1541 | if Present (Full_View (Etype (N))) then | |
1542 | if Is_Entity_Name (Nam) then | |
1543 | Set_Etype (Nam, Full_View (Etype (N))); | |
1544 | Set_Etype (Entity (Nam), Full_View (Etype (N))); | |
1545 | end if; | |
b63d61f7 | 1546 | |
d3271136 | 1547 | Set_Etype (N, Full_View (Etype (N))); |
b63d61f7 | 1548 | |
d3271136 EB |
1549 | elsif From_Limited_With (Etype (N)) |
1550 | and then Present (Non_Limited_View (Etype (N))) | |
1551 | then | |
1552 | Set_Etype (N, Non_Limited_View (Etype (N))); | |
c312b9f2 PMR |
1553 | |
1554 | -- If there is no completion for the type, this may be because | |
1555 | -- there is only a limited view of it and there is nothing in | |
1556 | -- the context of the current unit that has required a regular | |
1557 | -- compilation of the unit containing the type. We recognize | |
604801a4 | 1558 | -- this unusual case by the fact that unit is not analyzed. |
c312b9f2 PMR |
1559 | -- Note that the call being analyzed is in a different unit from |
1560 | -- the function declaration, and nothing indicates that the type | |
1561 | -- is a limited view. | |
1562 | ||
1563 | elsif Ekind (Scope (Etype (N))) = E_Package | |
1564 | and then Present (Limited_View (Scope (Etype (N)))) | |
1565 | and then not Analyzed (Unit_Declaration_Node (Scope (Etype (N)))) | |
1566 | then | |
c312b9f2 | 1567 | Error_Msg_NE |
d63199d8 PMR |
1568 | ("cannot call function that returns limited view of}", |
1569 | N, Etype (N)); | |
1570 | ||
1571 | Error_Msg_NE | |
1572 | ("\there must be a regular with_clause for package & in the " | |
1573 | & "current unit, or in some unit in its context", | |
1574 | N, Scope (Etype (N))); | |
1575 | ||
c312b9f2 | 1576 | Set_Etype (N, Any_Type); |
d3271136 | 1577 | end if; |
b63d61f7 | 1578 | end if; |
288cbbbd | 1579 | end if; |
996ae0b0 RK |
1580 | end Analyze_Call; |
1581 | ||
19d846a0 RD |
1582 | ----------------------------- |
1583 | -- Analyze_Case_Expression -- | |
1584 | ----------------------------- | |
1585 | ||
1586 | procedure Analyze_Case_Expression (N : Node_Id) is | |
19d846a0 RD |
1587 | procedure Non_Static_Choice_Error (Choice : Node_Id); |
1588 | -- Error routine invoked by the generic instantiation below when | |
1589 | -- the case expression has a non static choice. | |
1590 | ||
15918371 AC |
1591 | package Case_Choices_Analysis is new |
1592 | Generic_Analyze_Choices | |
1593 | (Process_Associated_Node => No_OP); | |
1594 | use Case_Choices_Analysis; | |
1595 | ||
1596 | package Case_Choices_Checking is new | |
1597 | Generic_Check_Choices | |
1598 | (Process_Empty_Choice => No_OP, | |
19d846a0 RD |
1599 | Process_Non_Static_Choice => Non_Static_Choice_Error, |
1600 | Process_Associated_Node => No_OP); | |
15918371 | 1601 | use Case_Choices_Checking; |
19d846a0 | 1602 | |
19d846a0 RD |
1603 | ----------------------------- |
1604 | -- Non_Static_Choice_Error -- | |
1605 | ----------------------------- | |
1606 | ||
1607 | procedure Non_Static_Choice_Error (Choice : Node_Id) is | |
1608 | begin | |
1609 | Flag_Non_Static_Expr | |
1610 | ("choice given in case expression is not static!", Choice); | |
1611 | end Non_Static_Choice_Error; | |
1612 | ||
752b81d9 AC |
1613 | -- Local variables |
1614 | ||
1615 | Expr : constant Node_Id := Expression (N); | |
752b81d9 AC |
1616 | Alt : Node_Id; |
1617 | Exp_Type : Entity_Id; | |
1618 | Exp_Btype : Entity_Id; | |
1619 | ||
308aab0b AC |
1620 | FirstX : Node_Id := Empty; |
1621 | -- First expression in the case for which there is some type information | |
1622 | -- available, i.e. it is not Any_Type, which can happen because of some | |
1623 | -- error, or from the use of e.g. raise Constraint_Error. | |
1624 | ||
752b81d9 | 1625 | Others_Present : Boolean; |
15918371 | 1626 | -- Indicates if Others was present |
752b81d9 | 1627 | |
e49de265 | 1628 | Wrong_Alt : Node_Id := Empty; |
10671e7a AC |
1629 | -- For error reporting |
1630 | ||
19d846a0 RD |
1631 | -- Start of processing for Analyze_Case_Expression |
1632 | ||
1633 | begin | |
1634 | if Comes_From_Source (N) then | |
c86cf714 | 1635 | Check_Compiler_Unit ("case expression", N); |
19d846a0 RD |
1636 | end if; |
1637 | ||
1638 | Analyze_And_Resolve (Expr, Any_Discrete); | |
1639 | Check_Unset_Reference (Expr); | |
1640 | Exp_Type := Etype (Expr); | |
1641 | Exp_Btype := Base_Type (Exp_Type); | |
1642 | ||
1643 | Alt := First (Alternatives (N)); | |
1644 | while Present (Alt) loop | |
b55993b3 AC |
1645 | if Error_Posted (Expression (Alt)) then |
1646 | return; | |
1647 | end if; | |
1648 | ||
19d846a0 | 1649 | Analyze (Expression (Alt)); |
308aab0b AC |
1650 | |
1651 | if No (FirstX) and then Etype (Expression (Alt)) /= Any_Type then | |
1652 | FirstX := Expression (Alt); | |
1653 | end if; | |
1654 | ||
19d846a0 RD |
1655 | Next (Alt); |
1656 | end loop; | |
1657 | ||
308aab0b AC |
1658 | -- Get our initial type from the first expression for which we got some |
1659 | -- useful type information from the expression. | |
1660 | ||
a6354842 AC |
1661 | if No (FirstX) then |
1662 | return; | |
1663 | end if; | |
1664 | ||
19d846a0 RD |
1665 | if not Is_Overloaded (FirstX) then |
1666 | Set_Etype (N, Etype (FirstX)); | |
1667 | ||
1668 | else | |
1669 | declare | |
1670 | I : Interp_Index; | |
1671 | It : Interp; | |
1672 | ||
1673 | begin | |
1674 | Set_Etype (N, Any_Type); | |
1675 | ||
1676 | Get_First_Interp (FirstX, I, It); | |
1677 | while Present (It.Nam) loop | |
1678 | ||
308e6f3a RW |
1679 | -- For each interpretation of the first expression, we only |
1680 | -- add the interpretation if every other expression in the | |
19d846a0 RD |
1681 | -- case expression alternatives has a compatible type. |
1682 | ||
1683 | Alt := Next (First (Alternatives (N))); | |
1684 | while Present (Alt) loop | |
1685 | exit when not Has_Compatible_Type (Expression (Alt), It.Typ); | |
1686 | Next (Alt); | |
1687 | end loop; | |
1688 | ||
1689 | if No (Alt) then | |
1690 | Add_One_Interp (N, It.Typ, It.Typ); | |
10671e7a AC |
1691 | else |
1692 | Wrong_Alt := Alt; | |
19d846a0 RD |
1693 | end if; |
1694 | ||
1695 | Get_Next_Interp (I, It); | |
1696 | end loop; | |
1697 | end; | |
1698 | end if; | |
1699 | ||
1700 | Exp_Btype := Base_Type (Exp_Type); | |
1701 | ||
1702 | -- The expression must be of a discrete type which must be determinable | |
1703 | -- independently of the context in which the expression occurs, but | |
1704 | -- using the fact that the expression must be of a discrete type. | |
1705 | -- Moreover, the type this expression must not be a character literal | |
1706 | -- (which is always ambiguous). | |
1707 | ||
1708 | -- If error already reported by Resolve, nothing more to do | |
1709 | ||
15918371 | 1710 | if Exp_Btype = Any_Discrete or else Exp_Btype = Any_Type then |
19d846a0 RD |
1711 | return; |
1712 | ||
bf0b0e5e AC |
1713 | -- Special casee message for character literal |
1714 | ||
19d846a0 RD |
1715 | elsif Exp_Btype = Any_Character then |
1716 | Error_Msg_N | |
1717 | ("character literal as case expression is ambiguous", Expr); | |
1718 | return; | |
1719 | end if; | |
1720 | ||
10671e7a | 1721 | if Etype (N) = Any_Type and then Present (Wrong_Alt) then |
bf0b0e5e AC |
1722 | Error_Msg_N |
1723 | ("type incompatible with that of previous alternatives", | |
1724 | Expression (Wrong_Alt)); | |
10671e7a AC |
1725 | return; |
1726 | end if; | |
1727 | ||
19d846a0 RD |
1728 | -- If the case expression is a formal object of mode in out, then |
1729 | -- treat it as having a nonstatic subtype by forcing use of the base | |
64ac53f4 | 1730 | -- type (which has to get passed to Check_Case_Choices below). Also |
19d846a0 RD |
1731 | -- use base type when the case expression is parenthesized. |
1732 | ||
1733 | if Paren_Count (Expr) > 0 | |
1734 | or else (Is_Entity_Name (Expr) | |
1735 | and then Ekind (Entity (Expr)) = E_Generic_In_Out_Parameter) | |
1736 | then | |
1737 | Exp_Type := Exp_Btype; | |
1738 | end if; | |
1739 | ||
752b81d9 AC |
1740 | -- The case expression alternatives cover the range of a static subtype |
1741 | -- subject to aspect Static_Predicate. Do not check the choices when the | |
1742 | -- case expression has not been fully analyzed yet because this may lead | |
1743 | -- to bogus errors. | |
1744 | ||
edab6088 | 1745 | if Is_OK_Static_Subtype (Exp_Type) |
ee4eee0a | 1746 | and then Has_Static_Predicate_Aspect (Exp_Type) |
752b81d9 AC |
1747 | and then In_Spec_Expression |
1748 | then | |
1749 | null; | |
1750 | ||
15918371 | 1751 | -- Call Analyze_Choices and Check_Choices to do the rest of the work |
19d846a0 | 1752 | |
752b81d9 | 1753 | else |
15918371 AC |
1754 | Analyze_Choices (Alternatives (N), Exp_Type); |
1755 | Check_Choices (N, Alternatives (N), Exp_Type, Others_Present); | |
19d846a0 | 1756 | |
dcd5fd67 PMR |
1757 | if Exp_Type = Universal_Integer and then not Others_Present then |
1758 | Error_Msg_N | |
1759 | ("case on universal integer requires OTHERS choice", Expr); | |
1760 | end if; | |
19d846a0 RD |
1761 | end if; |
1762 | end Analyze_Case_Expression; | |
1763 | ||
996ae0b0 RK |
1764 | --------------------------- |
1765 | -- Analyze_Comparison_Op -- | |
1766 | --------------------------- | |
1767 | ||
1768 | procedure Analyze_Comparison_Op (N : Node_Id) is | |
1769 | L : constant Node_Id := Left_Opnd (N); | |
1770 | R : constant Node_Id := Right_Opnd (N); | |
1771 | Op_Id : Entity_Id := Entity (N); | |
1772 | ||
1773 | begin | |
1774 | Set_Etype (N, Any_Type); | |
1775 | Candidate_Type := Empty; | |
1776 | ||
1777 | Analyze_Expression (L); | |
1778 | Analyze_Expression (R); | |
1779 | ||
1780 | if Present (Op_Id) then | |
996ae0b0 RK |
1781 | if Ekind (Op_Id) = E_Operator then |
1782 | Find_Comparison_Types (L, R, Op_Id, N); | |
1783 | else | |
1784 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
1785 | end if; | |
1786 | ||
1787 | if Is_Overloaded (L) then | |
1788 | Set_Etype (L, Intersect_Types (L, R)); | |
1789 | end if; | |
1790 | ||
1791 | else | |
1792 | Op_Id := Get_Name_Entity_Id (Chars (N)); | |
996ae0b0 | 1793 | while Present (Op_Id) loop |
996ae0b0 RK |
1794 | if Ekind (Op_Id) = E_Operator then |
1795 | Find_Comparison_Types (L, R, Op_Id, N); | |
1796 | else | |
1797 | Analyze_User_Defined_Binary_Op (N, Op_Id); | |
1798 | end if; | |
1799 | ||
1800 | Op_Id := Homonym (Op_Id); | |
1801 | end loop; | |
1802 | end if; | |
1803 | ||
1804 | Operator_Check (N); | |
22e89283 | 1805 | Check_Function_Writable_Actuals (N); |
996ae0b0 RK |
1806 | end Analyze_Comparison_Op; |
1807 | ||
1808 | --------------------------- | |
1809 | -- Analyze_Concatenation -- | |
1810 | --------------------------- | |
1811 | ||
fe39cf20 BD |
1812 | procedure Analyze_Concatenation (N : Node_Id) is |
1813 | ||
1814 | -- We wish to avoid deep recursion, because concatenations are often | |
1815 | -- deeply nested, as in A&B&...&Z. Therefore, we walk down the left | |
1816 | -- operands nonrecursively until we find something that is not a | |
1817 | -- concatenation (A in this case), or has already been analyzed. We | |
1818 | -- analyze that, and then walk back up the tree following Parent | |
1819 | -- pointers, calling Analyze_Concatenation_Rest to do the rest of the | |
1820 | -- work at each level. The Parent pointers allow us to avoid recursion, | |
1821 | -- and thus avoid running out of memory. | |
1822 | ||
1823 | NN : Node_Id := N; | |
1824 | L : Node_Id; | |
1825 | ||
1826 | begin | |
1827 | Candidate_Type := Empty; | |
1828 | ||
1829 | -- The following code is equivalent to: | |
1830 | ||
1831 | -- Set_Etype (N, Any_Type); | |
1832 | -- Analyze_Expression (Left_Opnd (N)); | |
1833 | -- Analyze_Concatenation_Rest (N); | |
1834 | ||
1835 | -- where the Analyze_Expression call recurses back here if the left | |
1836 | -- operand is a concatenation. | |
1837 | ||
1838 | -- Walk down left operands | |
1839 | ||
1840 | loop | |
1841 | Set_Etype (NN, Any_Type); | |
1842 | L := Left_Opnd (NN); | |
1843 | exit when Nkind (L) /= N_Op_Concat or else Analyzed (L); | |
1844 | NN := L; | |
1845 | end loop; | |
1846 | ||
1847 | -- Now (given the above example) NN is A&B and L is A | |
1848 | ||
1849 | -- First analyze L ... | |
1850 | ||
1851 | Analyze_Expression (L); | |
1852 | ||
1853 | -- ... then walk NN back up until we reach N (where we started), calling | |
1854 | -- Analyze_Concatenation_Rest along the way. | |
1855 | ||
1856 | loop | |
1857 | Analyze_Concatenation_Rest (NN); | |
1858 | exit when NN = N; | |
1859 | NN := Parent (NN); | |
1860 | end loop; | |
1861 | end Analyze_Concatenation; | |
1862 | ||
1863 | -------------------------------- | |
1864 | -- Analyze_Concatenation_Rest -- | |
1865 | -------------------------------- | |
1866 | ||
996ae0b0 RK |
1867 | -- If the only one-dimensional array type in scope is String, |
1868 | -- this is the resulting type of the operation. Otherwise there | |
1869 | -- will be a concatenation operation defined for each user-defined | |
1870 | -- one-dimensional array. | |
1871 | ||
fe39cf20 | 1872 | procedure Analyze_Concatenation_Rest (N : Node_Id) is |
996ae0b0 RK |
1873 | L : constant Node_Id := Left_Opnd (N); |
1874 | R : constant Node_Id := Right_Opnd (N); | |
1875 | Op_Id : Entity_Id := Entity (N); | |
1876 | LT : Entity_Id; | |
1877 | RT : Entity_Id; | |
1878 | ||
1879 | begin | |
996ae0b0 RK |
1880 | Analyze_Expression (R); |
1881 | ||
cd3cd5b1 AC |
1882 | -- If the entity is present, the node appears in an instance, and |
1883 | -- denotes a predefined concatenation operation. The resulting type is | |
1884 | -- obtained from the arguments when possible. If the arguments are | |
1885 | -- aggregates, the array type and the concatenation type must be | |
fbf5a39b | 1886 | -- visible. |
996ae0b0 RK |
1887 | |
1888 | if Present (Op_Id) then | |
1889 | if Ekind (Op_Id) = E_Operator then | |
996ae0b0 RK |
1890 | LT := Base_Type (Etype (L)); |
1891 | RT := Base_Type (Etype (R)); | |
1892 | ||
1893 | if Is_Array_Type (LT) | |
1894 | and then (RT = LT or else RT = Base_Type (Component_Type (LT))) | |
1895 | then | |
1896 | Add_One_Interp (N, Op_Id, LT); | |
1897 | ||
1898 | elsif Is_Array_Type (RT) | |
1899 | and then LT = Base_Type (Component_Type (RT)) | |
1900 | then | |
1901 | Add_One_Interp (N, Op_Id, RT); | |
1902 | ||
fbf5a39b AC |
1903 | -- If one operand is a string type or a user-defined array type, |
1904 | -- and the other is a literal, result is of the specific type. | |
1905 | ||
1906 | elsif | |
1907 | (Root_Type (LT) = Standard_String | |
1908 | or else Scope (LT) /= Standard_Standard) | |
1909 | and then Etype (R) = Any_String | |
1910 | then | |
1911 | Add_One_Interp (N, Op_Id, LT); | |
1912 | ||
1913 | elsif | |
1914 | (Root_Type (RT) = Standard_String | |
1915 | or else Scope (RT) /= Standard_Standard) | |
1916 | and then Etype (L) = Any_String | |
1917 | then | |
1918 | Add_One_Interp (N, Op_Id, RT); | |
1919 | ||
1920 | elsif not Is_Generic_Type (Etype (Op_Id)) then | |
996ae0b0 | 1921 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); |
fbf5a39b AC |
1922 | |
1923 | else | |
4c46b835 | 1924 | -- Type and its operations must be visible |
fbf5a39b AC |
1925 | |
1926 | Set_Entity (N, Empty); | |
1927 | Analyze_Concatenation (N); | |
996ae0b0 RK |
1928 | end if; |
1929 | ||
1930 | else | |
1931 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
1932 | end if; | |
1933 | ||
1934 | else | |
1a8fae99 | 1935 | Op_Id := Get_Name_Entity_Id (Name_Op_Concat); |
996ae0b0 RK |
1936 | while Present (Op_Id) loop |
1937 | if Ekind (Op_Id) = E_Operator then | |
1a8fae99 | 1938 | |
155ed511 SL |
1939 | -- Do not consider operators declared in dead code, they |
1940 | -- cannot be part of the resolution. | |
1a8fae99 ES |
1941 | |
1942 | if Is_Eliminated (Op_Id) then | |
1943 | null; | |
1944 | else | |
1945 | Find_Concatenation_Types (L, R, Op_Id, N); | |
1946 | end if; | |
1947 | ||
996ae0b0 RK |
1948 | else |
1949 | Analyze_User_Defined_Binary_Op (N, Op_Id); | |
1950 | end if; | |
1951 | ||
1952 | Op_Id := Homonym (Op_Id); | |
1953 | end loop; | |
1954 | end if; | |
1955 | ||
1956 | Operator_Check (N); | |
fe39cf20 | 1957 | end Analyze_Concatenation_Rest; |
996ae0b0 | 1958 | |
996ae0b0 RK |
1959 | ------------------------- |
1960 | -- Analyze_Equality_Op -- | |
1961 | ------------------------- | |
1962 | ||
1963 | procedure Analyze_Equality_Op (N : Node_Id) is | |
4c46b835 AC |
1964 | Loc : constant Source_Ptr := Sloc (N); |
1965 | L : constant Node_Id := Left_Opnd (N); | |
1966 | R : constant Node_Id := Right_Opnd (N); | |
1967 | Op_Id : Entity_Id; | |
996ae0b0 RK |
1968 | |
1969 | begin | |
1970 | Set_Etype (N, Any_Type); | |
1971 | Candidate_Type := Empty; | |
1972 | ||
1973 | Analyze_Expression (L); | |
1974 | Analyze_Expression (R); | |
1975 | ||
1976 | -- If the entity is set, the node is a generic instance with a non-local | |
1977 | -- reference to the predefined operator or to a user-defined function. | |
1978 | -- It can also be an inequality that is expanded into the negation of a | |
1979 | -- call to a user-defined equality operator. | |
1980 | ||
1981 | -- For the predefined case, the result is Boolean, regardless of the | |
21d7ef70 | 1982 | -- type of the operands. The operands may even be limited, if they are |
996ae0b0 RK |
1983 | -- generic actuals. If they are overloaded, label the left argument with |
1984 | -- the common type that must be present, or with the type of the formal | |
1985 | -- of the user-defined function. | |
1986 | ||
1987 | if Present (Entity (N)) then | |
996ae0b0 RK |
1988 | Op_Id := Entity (N); |
1989 | ||
1990 | if Ekind (Op_Id) = E_Operator then | |
1991 | Add_One_Interp (N, Op_Id, Standard_Boolean); | |
1992 | else | |
1993 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
1994 | end if; | |
1995 | ||
1996 | if Is_Overloaded (L) then | |
996ae0b0 RK |
1997 | if Ekind (Op_Id) = E_Operator then |
1998 | Set_Etype (L, Intersect_Types (L, R)); | |
1999 | else | |
2000 | Set_Etype (L, Etype (First_Formal (Op_Id))); | |
2001 | end if; | |
2002 | end if; | |
2003 | ||
2004 | else | |
2005 | Op_Id := Get_Name_Entity_Id (Chars (N)); | |
996ae0b0 | 2006 | while Present (Op_Id) loop |
996ae0b0 RK |
2007 | if Ekind (Op_Id) = E_Operator then |
2008 | Find_Equality_Types (L, R, Op_Id, N); | |
2009 | else | |
2010 | Analyze_User_Defined_Binary_Op (N, Op_Id); | |
2011 | end if; | |
2012 | ||
2013 | Op_Id := Homonym (Op_Id); | |
2014 | end loop; | |
2015 | end if; | |
2016 | ||
84dad556 AC |
2017 | -- If there was no match, and the operator is inequality, this may be |
2018 | -- a case where inequality has not been made explicit, as for tagged | |
2019 | -- types. Analyze the node as the negation of an equality operation. | |
2020 | -- This cannot be done earlier, because before analysis we cannot rule | |
2021 | -- out the presence of an explicit inequality. | |
996ae0b0 RK |
2022 | |
2023 | if Etype (N) = Any_Type | |
2024 | and then Nkind (N) = N_Op_Ne | |
2025 | then | |
2026 | Op_Id := Get_Name_Entity_Id (Name_Op_Eq); | |
996ae0b0 | 2027 | while Present (Op_Id) loop |
996ae0b0 RK |
2028 | if Ekind (Op_Id) = E_Operator then |
2029 | Find_Equality_Types (L, R, Op_Id, N); | |
2030 | else | |
2031 | Analyze_User_Defined_Binary_Op (N, Op_Id); | |
2032 | end if; | |
2033 | ||
2034 | Op_Id := Homonym (Op_Id); | |
2035 | end loop; | |
2036 | ||
2037 | if Etype (N) /= Any_Type then | |
2038 | Op_Id := Entity (N); | |
2039 | ||
2040 | Rewrite (N, | |
2041 | Make_Op_Not (Loc, | |
2042 | Right_Opnd => | |
2043 | Make_Op_Eq (Loc, | |
aab883ec ES |
2044 | Left_Opnd => Left_Opnd (N), |
2045 | Right_Opnd => Right_Opnd (N)))); | |
996ae0b0 RK |
2046 | |
2047 | Set_Entity (Right_Opnd (N), Op_Id); | |
2048 | Analyze (N); | |
2049 | end if; | |
2050 | end if; | |
2051 | ||
2052 | Operator_Check (N); | |
22e89283 | 2053 | Check_Function_Writable_Actuals (N); |
996ae0b0 RK |
2054 | end Analyze_Equality_Op; |
2055 | ||
2056 | ---------------------------------- | |
2057 | -- Analyze_Explicit_Dereference -- | |
2058 | ---------------------------------- | |
2059 | ||
2060 | procedure Analyze_Explicit_Dereference (N : Node_Id) is | |
2061 | Loc : constant Source_Ptr := Sloc (N); | |
2062 | P : constant Node_Id := Prefix (N); | |
2063 | T : Entity_Id; | |
2064 | I : Interp_Index; | |
2065 | It : Interp; | |
2066 | New_N : Node_Id; | |
2067 | ||
2068 | function Is_Function_Type return Boolean; | |
4c46b835 AC |
2069 | -- Check whether node may be interpreted as an implicit function call |
2070 | ||
2071 | ---------------------- | |
2072 | -- Is_Function_Type -- | |
2073 | ---------------------- | |
996ae0b0 RK |
2074 | |
2075 | function Is_Function_Type return Boolean is | |
4c46b835 AC |
2076 | I : Interp_Index; |
2077 | It : Interp; | |
996ae0b0 RK |
2078 | |
2079 | begin | |
2080 | if not Is_Overloaded (N) then | |
2081 | return Ekind (Base_Type (Etype (N))) = E_Subprogram_Type | |
2082 | and then Etype (Base_Type (Etype (N))) /= Standard_Void_Type; | |
2083 | ||
2084 | else | |
2085 | Get_First_Interp (N, I, It); | |
996ae0b0 RK |
2086 | while Present (It.Nam) loop |
2087 | if Ekind (Base_Type (It.Typ)) /= E_Subprogram_Type | |
2088 | or else Etype (Base_Type (It.Typ)) = Standard_Void_Type | |
2089 | then | |
2090 | return False; | |
2091 | end if; | |
2092 | ||
2093 | Get_Next_Interp (I, It); | |
2094 | end loop; | |
2095 | ||
2096 | return True; | |
2097 | end if; | |
2098 | end Is_Function_Type; | |
2099 | ||
98123480 | 2100 | -- Start of processing for Analyze_Explicit_Dereference |
4c46b835 | 2101 | |
996ae0b0 | 2102 | begin |
11bc76df AC |
2103 | -- If source node, check SPARK restriction. We guard this with the |
2104 | -- source node check, because ??? | |
2105 | ||
36b8f95f | 2106 | if Comes_From_Source (N) then |
ce5ba43a | 2107 | Check_SPARK_05_Restriction ("explicit dereference is not allowed", N); |
36b8f95f | 2108 | end if; |
1d801f21 | 2109 | |
226a7fa4 AC |
2110 | -- In formal verification mode, keep track of all reads and writes |
2111 | -- through explicit dereferences. | |
2112 | ||
f5da7a97 | 2113 | if GNATprove_Mode then |
06b599fd | 2114 | SPARK_Specific.Generate_Dereference (N); |
226a7fa4 AC |
2115 | end if; |
2116 | ||
996ae0b0 RK |
2117 | Analyze (P); |
2118 | Set_Etype (N, Any_Type); | |
2119 | ||
2120 | -- Test for remote access to subprogram type, and if so return | |
2121 | -- after rewriting the original tree. | |
2122 | ||
2123 | if Remote_AST_E_Dereference (P) then | |
2124 | return; | |
2125 | end if; | |
2126 | ||
2127 | -- Normal processing for other than remote access to subprogram type | |
2128 | ||
2129 | if not Is_Overloaded (P) then | |
2130 | if Is_Access_Type (Etype (P)) then | |
2131 | ||
ff9d220e | 2132 | -- Set the Etype |
996ae0b0 RK |
2133 | |
2134 | declare | |
ff9d220e | 2135 | DT : constant Entity_Id := Designated_Type (Etype (P)); |
996ae0b0 RK |
2136 | |
2137 | begin | |
0a36105d | 2138 | -- An explicit dereference is a legal occurrence of an |
0c6826a5 AC |
2139 | -- incomplete type imported through a limited_with clause, if |
2140 | -- the full view is visible, or if we are within an instance | |
2141 | -- body, where the enclosing body has a regular with_clause | |
2142 | -- on the unit. | |
0a36105d | 2143 | |
7b56a91b AC |
2144 | if From_Limited_With (DT) |
2145 | and then not From_Limited_With (Scope (DT)) | |
0a36105d JM |
2146 | and then |
2147 | (Is_Immediately_Visible (Scope (DT)) | |
2148 | or else | |
2149 | (Is_Child_Unit (Scope (DT)) | |
bff469f7 AC |
2150 | and then Is_Visible_Lib_Unit (Scope (DT))) |
2151 | or else In_Instance_Body) | |
0a36105d JM |
2152 | then |
2153 | Set_Etype (N, Available_View (DT)); | |
2154 | ||
2155 | else | |
2156 | Set_Etype (N, DT); | |
2157 | end if; | |
996ae0b0 RK |
2158 | end; |
2159 | ||
2160 | elsif Etype (P) /= Any_Type then | |
2161 | Error_Msg_N ("prefix of dereference must be an access type", N); | |
2162 | return; | |
2163 | end if; | |
2164 | ||
2165 | else | |
2166 | Get_First_Interp (P, I, It); | |
996ae0b0 RK |
2167 | while Present (It.Nam) loop |
2168 | T := It.Typ; | |
2169 | ||
2170 | if Is_Access_Type (T) then | |
2171 | Add_One_Interp (N, Designated_Type (T), Designated_Type (T)); | |
2172 | end if; | |
2173 | ||
2174 | Get_Next_Interp (I, It); | |
2175 | end loop; | |
2176 | ||
6e73e3ab | 2177 | -- Error if no interpretation of the prefix has an access type |
996ae0b0 RK |
2178 | |
2179 | if Etype (N) = Any_Type then | |
2180 | Error_Msg_N | |
2181 | ("access type required in prefix of explicit dereference", P); | |
2182 | Set_Etype (N, Any_Type); | |
2183 | return; | |
2184 | end if; | |
2185 | end if; | |
2186 | ||
2187 | if Is_Function_Type | |
2188 | and then Nkind (Parent (N)) /= N_Indexed_Component | |
2189 | ||
2190 | and then (Nkind (Parent (N)) /= N_Function_Call | |
2191 | or else N /= Name (Parent (N))) | |
2192 | ||
2193 | and then (Nkind (Parent (N)) /= N_Procedure_Call_Statement | |
2194 | or else N /= Name (Parent (N))) | |
2195 | ||
2196 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
2197 | and then (Nkind (Parent (N)) /= N_Attribute_Reference | |
2198 | or else | |
2199 | (Attribute_Name (Parent (N)) /= Name_Address | |
2200 | and then | |
2201 | Attribute_Name (Parent (N)) /= Name_Access)) | |
2202 | then | |
2203 | -- Name is a function call with no actuals, in a context that | |
2204 | -- requires deproceduring (including as an actual in an enclosing | |
98123480 | 2205 | -- function or procedure call). There are some pathological cases |
996ae0b0 RK |
2206 | -- where the prefix might include functions that return access to |
2207 | -- subprograms and others that return a regular type. Disambiguation | |
98123480 | 2208 | -- of those has to take place in Resolve. |
996ae0b0 RK |
2209 | |
2210 | New_N := | |
2211 | Make_Function_Call (Loc, | |
b55993b3 AC |
2212 | Name => Make_Explicit_Dereference (Loc, P), |
2213 | Parameter_Associations => New_List); | |
996ae0b0 RK |
2214 | |
2215 | -- If the prefix is overloaded, remove operations that have formals, | |
2216 | -- we know that this is a parameterless call. | |
2217 | ||
2218 | if Is_Overloaded (P) then | |
2219 | Get_First_Interp (P, I, It); | |
996ae0b0 RK |
2220 | while Present (It.Nam) loop |
2221 | T := It.Typ; | |
2222 | ||
2223 | if No (First_Formal (Base_Type (Designated_Type (T)))) then | |
2224 | Set_Etype (P, T); | |
2225 | else | |
2226 | Remove_Interp (I); | |
2227 | end if; | |
2228 | ||
2229 | Get_Next_Interp (I, It); | |
2230 | end loop; | |
2231 | end if; | |
2232 | ||
2233 | Rewrite (N, New_N); | |
2234 | Analyze (N); | |
98123480 ES |
2235 | |
2236 | elsif not Is_Function_Type | |
2237 | and then Is_Overloaded (N) | |
2238 | then | |
2239 | -- The prefix may include access to subprograms and other access | |
1cb17b78 | 2240 | -- types. If the context selects the interpretation that is a |
56a7a3ab TQ |
2241 | -- function call (not a procedure call) we cannot rewrite the node |
2242 | -- yet, but we include the result of the call interpretation. | |
98123480 ES |
2243 | |
2244 | Get_First_Interp (N, I, It); | |
2245 | while Present (It.Nam) loop | |
2246 | if Ekind (Base_Type (It.Typ)) = E_Subprogram_Type | |
2247 | and then Etype (Base_Type (It.Typ)) /= Standard_Void_Type | |
1cb17b78 | 2248 | and then Nkind (Parent (N)) /= N_Procedure_Call_Statement |
98123480 ES |
2249 | then |
2250 | Add_One_Interp (N, Etype (It.Typ), Etype (It.Typ)); | |
2251 | end if; | |
2252 | ||
2253 | Get_Next_Interp (I, It); | |
2254 | end loop; | |
996ae0b0 RK |
2255 | end if; |
2256 | ||
2257 | -- A value of remote access-to-class-wide must not be dereferenced | |
2258 | -- (RM E.2.2(16)). | |
2259 | ||
2260 | Validate_Remote_Access_To_Class_Wide_Type (N); | |
996ae0b0 RK |
2261 | end Analyze_Explicit_Dereference; |
2262 | ||
2263 | ------------------------ | |
2264 | -- Analyze_Expression -- | |
2265 | ------------------------ | |
2266 | ||
2267 | procedure Analyze_Expression (N : Node_Id) is | |
2268 | begin | |
5f50020a ES |
2269 | |
2270 | -- If the expression is an indexed component that will be rewritten | |
2271 | -- as a container indexing, it has already been analyzed. | |
2272 | ||
2273 | if Nkind (N) = N_Indexed_Component | |
2274 | and then Present (Generalized_Indexing (N)) | |
2275 | then | |
2276 | null; | |
2277 | ||
2278 | else | |
2279 | Analyze (N); | |
2280 | Check_Parameterless_Call (N); | |
2281 | end if; | |
996ae0b0 RK |
2282 | end Analyze_Expression; |
2283 | ||
955871d3 AC |
2284 | ------------------------------------- |
2285 | -- Analyze_Expression_With_Actions -- | |
2286 | ------------------------------------- | |
2287 | ||
2288 | procedure Analyze_Expression_With_Actions (N : Node_Id) is | |
2289 | A : Node_Id; | |
2290 | ||
2291 | begin | |
2292 | A := First (Actions (N)); | |
752b81d9 | 2293 | while Present (A) loop |
955871d3 AC |
2294 | Analyze (A); |
2295 | Next (A); | |
955871d3 AC |
2296 | end loop; |
2297 | ||
2ffcbaa5 AC |
2298 | Analyze_Expression (Expression (N)); |
2299 | Set_Etype (N, Etype (Expression (N))); | |
955871d3 AC |
2300 | end Analyze_Expression_With_Actions; |
2301 | ||
9b16cb57 RD |
2302 | --------------------------- |
2303 | -- Analyze_If_Expression -- | |
2304 | --------------------------- | |
2305 | ||
2306 | procedure Analyze_If_Expression (N : Node_Id) is | |
2307 | Condition : constant Node_Id := First (Expressions (N)); | |
a6354842 | 2308 | Then_Expr : Node_Id; |
9b16cb57 RD |
2309 | Else_Expr : Node_Id; |
2310 | ||
2311 | begin | |
2312 | -- Defend against error of missing expressions from previous error | |
2313 | ||
a6354842 AC |
2314 | if No (Condition) then |
2315 | Check_Error_Detected; | |
2316 | return; | |
2317 | end if; | |
b55993b3 | 2318 | |
a6354842 AC |
2319 | Then_Expr := Next (Condition); |
2320 | ||
9b16cb57 | 2321 | if No (Then_Expr) then |
ee2ba856 | 2322 | Check_Error_Detected; |
9b16cb57 RD |
2323 | return; |
2324 | end if; | |
b55993b3 | 2325 | |
a6354842 | 2326 | Else_Expr := Next (Then_Expr); |
9b16cb57 | 2327 | |
08988ed9 | 2328 | if Comes_From_Source (N) then |
ce5ba43a | 2329 | Check_SPARK_05_Restriction ("if expression is not allowed", N); |
08988ed9 | 2330 | end if; |
9b16cb57 | 2331 | |
9b16cb57 | 2332 | if Comes_From_Source (N) then |
c86cf714 | 2333 | Check_Compiler_Unit ("if expression", N); |
9b16cb57 RD |
2334 | end if; |
2335 | ||
ac072cb2 AC |
2336 | -- Analyze and resolve the condition. We need to resolve this now so |
2337 | -- that it gets folded to True/False if possible, before we analyze | |
2338 | -- the THEN/ELSE branches, because when analyzing these branches, we | |
2339 | -- may call Is_Statically_Unevaluated, which expects the condition of | |
2340 | -- an enclosing IF to have been analyze/resolved/evaluated. | |
2341 | ||
9b16cb57 | 2342 | Analyze_Expression (Condition); |
ac072cb2 AC |
2343 | Resolve (Condition, Any_Boolean); |
2344 | ||
2345 | -- Analyze THEN expression and (if present) ELSE expression. For those | |
2346 | -- we delay resolution in the normal manner, because of overloading etc. | |
2347 | ||
9b16cb57 RD |
2348 | Analyze_Expression (Then_Expr); |
2349 | ||
2350 | if Present (Else_Expr) then | |
2351 | Analyze_Expression (Else_Expr); | |
2352 | end if; | |
2353 | ||
2354 | -- If then expression not overloaded, then that decides the type | |
2355 | ||
2356 | if not Is_Overloaded (Then_Expr) then | |
2357 | Set_Etype (N, Etype (Then_Expr)); | |
2358 | ||
2359 | -- Case where then expression is overloaded | |
2360 | ||
2361 | else | |
2362 | declare | |
2363 | I : Interp_Index; | |
2364 | It : Interp; | |
2365 | ||
2366 | begin | |
2367 | Set_Etype (N, Any_Type); | |
2368 | ||
bc795e3e | 2369 | -- Loop through interpretations of Then_Expr |
9b16cb57 RD |
2370 | |
2371 | Get_First_Interp (Then_Expr, I, It); | |
445e5888 | 2372 | while Present (It.Nam) loop |
9b16cb57 | 2373 | |
bc795e3e | 2374 | -- Add possible interpretation of Then_Expr if no Else_Expr, or |
0c6826a5 | 2375 | -- Else_Expr is present and has a compatible type. |
9b16cb57 | 2376 | |
445e5888 AC |
2377 | if No (Else_Expr) |
2378 | or else Has_Compatible_Type (Else_Expr, It.Typ) | |
2379 | then | |
2380 | Add_One_Interp (N, It.Typ, It.Typ); | |
2381 | end if; | |
9b16cb57 | 2382 | |
445e5888 AC |
2383 | Get_Next_Interp (I, It); |
2384 | end loop; | |
7408c4a5 | 2385 | |
bc38dbb4 AC |
2386 | -- If no valid interpretation has been found, then the type of the |
2387 | -- ELSE expression does not match any interpretation of the THEN | |
2388 | -- expression. | |
7408c4a5 AC |
2389 | |
2390 | if Etype (N) = Any_Type then | |
2391 | Error_Msg_N | |
2392 | ("type incompatible with that of `THEN` expression", | |
2393 | Else_Expr); | |
2394 | return; | |
2395 | end if; | |
9b16cb57 RD |
2396 | end; |
2397 | end if; | |
2398 | end Analyze_If_Expression; | |
2399 | ||
996ae0b0 RK |
2400 | ------------------------------------ |
2401 | -- Analyze_Indexed_Component_Form -- | |
2402 | ------------------------------------ | |
2403 | ||
2404 | procedure Analyze_Indexed_Component_Form (N : Node_Id) is | |
fbf5a39b AC |
2405 | P : constant Node_Id := Prefix (N); |
2406 | Exprs : constant List_Id := Expressions (N); | |
2407 | Exp : Node_Id; | |
2408 | P_T : Entity_Id; | |
2409 | E : Node_Id; | |
2410 | U_N : Entity_Id; | |
996ae0b0 RK |
2411 | |
2412 | procedure Process_Function_Call; | |
0c6826a5 AC |
2413 | -- Prefix in indexed component form is an overloadable entity, so the |
2414 | -- node is a function call. Reformat it as such. | |
996ae0b0 RK |
2415 | |
2416 | procedure Process_Indexed_Component; | |
2417 | -- Prefix in indexed component form is actually an indexed component. | |
2418 | -- This routine processes it, knowing that the prefix is already | |
2419 | -- resolved. | |
2420 | ||
2421 | procedure Process_Indexed_Component_Or_Slice; | |
2422 | -- An indexed component with a single index may designate a slice if | |
2423 | -- the index is a subtype mark. This routine disambiguates these two | |
2424 | -- cases by resolving the prefix to see if it is a subtype mark. | |
2425 | ||
2426 | procedure Process_Overloaded_Indexed_Component; | |
2427 | -- If the prefix of an indexed component is overloaded, the proper | |
2428 | -- interpretation is selected by the index types and the context. | |
2429 | ||
2430 | --------------------------- | |
2431 | -- Process_Function_Call -- | |
2432 | --------------------------- | |
2433 | ||
2434 | procedure Process_Function_Call is | |
1725676d | 2435 | Loc : constant Source_Ptr := Sloc (N); |
f5afb270 AC |
2436 | Actual : Node_Id; |
2437 | ||
996ae0b0 RK |
2438 | begin |
2439 | Change_Node (N, N_Function_Call); | |
2440 | Set_Name (N, P); | |
2441 | Set_Parameter_Associations (N, Exprs); | |
996ae0b0 | 2442 | |
401093c1 | 2443 | -- Analyze actuals prior to analyzing the call itself |
0a36105d | 2444 | |
4c46b835 | 2445 | Actual := First (Parameter_Associations (N)); |
996ae0b0 RK |
2446 | while Present (Actual) loop |
2447 | Analyze (Actual); | |
2448 | Check_Parameterless_Call (Actual); | |
0a36105d JM |
2449 | |
2450 | -- Move to next actual. Note that we use Next, not Next_Actual | |
2451 | -- here. The reason for this is a bit subtle. If a function call | |
0c6826a5 AC |
2452 | -- includes named associations, the parser recognizes the node |
2453 | -- as a call, and it is analyzed as such. If all associations are | |
0a36105d JM |
2454 | -- positional, the parser builds an indexed_component node, and |
2455 | -- it is only after analysis of the prefix that the construct | |
2456 | -- is recognized as a call, in which case Process_Function_Call | |
2457 | -- rewrites the node and analyzes the actuals. If the list of | |
2458 | -- actuals is malformed, the parser may leave the node as an | |
2459 | -- indexed component (despite the presence of named associations). | |
2460 | -- The iterator Next_Actual is equivalent to Next if the list is | |
2461 | -- positional, but follows the normalized chain of actuals when | |
2462 | -- named associations are present. In this case normalization has | |
2463 | -- not taken place, and actuals remain unanalyzed, which leads to | |
2464 | -- subsequent crashes or loops if there is an attempt to continue | |
2465 | -- analysis of the program. | |
2466 | ||
1725676d AC |
2467 | -- IF there is a single actual and it is a type name, the node |
2468 | -- can only be interpreted as a slice of a parameterless call. | |
2469 | -- Rebuild the node as such and analyze. | |
2470 | ||
2471 | if No (Next (Actual)) | |
2472 | and then Is_Entity_Name (Actual) | |
2473 | and then Is_Type (Entity (Actual)) | |
2474 | and then Is_Discrete_Type (Entity (Actual)) | |
2475 | then | |
2476 | Replace (N, | |
adc876a8 AC |
2477 | Make_Slice (Loc, |
2478 | Prefix => P, | |
2479 | Discrete_Range => | |
2480 | New_Occurrence_Of (Entity (Actual), Loc))); | |
1725676d AC |
2481 | Analyze (N); |
2482 | return; | |
2483 | ||
2484 | else | |
2485 | Next (Actual); | |
2486 | end if; | |
996ae0b0 RK |
2487 | end loop; |
2488 | ||
2489 | Analyze_Call (N); | |
2490 | end Process_Function_Call; | |
2491 | ||
2492 | ------------------------------- | |
2493 | -- Process_Indexed_Component -- | |
2494 | ------------------------------- | |
2495 | ||
2496 | procedure Process_Indexed_Component is | |
fe39cf20 BD |
2497 | Exp : Node_Id; |
2498 | Array_Type : Entity_Id; | |
2499 | Index : Node_Id; | |
2500 | Pent : Entity_Id := Empty; | |
996ae0b0 RK |
2501 | |
2502 | begin | |
2503 | Exp := First (Exprs); | |
2504 | ||
2505 | if Is_Overloaded (P) then | |
2506 | Process_Overloaded_Indexed_Component; | |
2507 | ||
2508 | else | |
2509 | Array_Type := Etype (P); | |
2510 | ||
6e73e3ab AC |
2511 | if Is_Entity_Name (P) then |
2512 | Pent := Entity (P); | |
2513 | elsif Nkind (P) = N_Selected_Component | |
2514 | and then Is_Entity_Name (Selector_Name (P)) | |
2515 | then | |
2516 | Pent := Entity (Selector_Name (P)); | |
2517 | end if; | |
2518 | ||
2519 | -- Prefix must be appropriate for an array type, taking into | |
2520 | -- account a possible implicit dereference. | |
996ae0b0 RK |
2521 | |
2522 | if Is_Access_Type (Array_Type) then | |
324ac540 AC |
2523 | Error_Msg_NW |
2524 | (Warn_On_Dereference, "?d?implicit dereference", N); | |
d469eabe | 2525 | Array_Type := Process_Implicit_Dereference_Prefix (Pent, P); |
996ae0b0 RK |
2526 | end if; |
2527 | ||
2528 | if Is_Array_Type (Array_Type) then | |
bfaf8a97 AC |
2529 | |
2530 | -- In order to correctly access First_Index component later, | |
2531 | -- replace string literal subtype by its parent type. | |
2532 | ||
2533 | if Ekind (Array_Type) = E_String_Literal_Subtype then | |
2534 | Array_Type := Etype (Array_Type); | |
2535 | end if; | |
996ae0b0 | 2536 | |
6e73e3ab | 2537 | elsif Present (Pent) and then Ekind (Pent) = E_Entry_Family then |
996ae0b0 RK |
2538 | Analyze (Exp); |
2539 | Set_Etype (N, Any_Type); | |
2540 | ||
dafe11cd | 2541 | if not Has_Compatible_Type (Exp, Entry_Index_Type (Pent)) then |
996ae0b0 RK |
2542 | Error_Msg_N ("invalid index type in entry name", N); |
2543 | ||
2544 | elsif Present (Next (Exp)) then | |
2545 | Error_Msg_N ("too many subscripts in entry reference", N); | |
2546 | ||
2547 | else | |
2548 | Set_Etype (N, Etype (P)); | |
2549 | end if; | |
2550 | ||
2551 | return; | |
2552 | ||
2553 | elsif Is_Record_Type (Array_Type) | |
2554 | and then Remote_AST_I_Dereference (P) | |
2555 | then | |
2556 | return; | |
2557 | ||
50878404 | 2558 | elsif Try_Container_Indexing (N, P, Exprs) then |
d50f4827 AC |
2559 | return; |
2560 | ||
996ae0b0 RK |
2561 | elsif Array_Type = Any_Type then |
2562 | Set_Etype (N, Any_Type); | |
6465b6a7 AC |
2563 | |
2564 | -- In most cases the analysis of the prefix will have emitted | |
2565 | -- an error already, but if the prefix may be interpreted as a | |
2566 | -- call in prefixed notation, the report is left to the caller. | |
2567 | -- To prevent cascaded errors, report only if no previous ones. | |
2568 | ||
2569 | if Serious_Errors_Detected = 0 then | |
2570 | Error_Msg_N ("invalid prefix in indexed component", P); | |
2571 | ||
2572 | if Nkind (P) = N_Expanded_Name then | |
2573 | Error_Msg_NE ("\& is not visible", P, Selector_Name (P)); | |
2574 | end if; | |
2575 | end if; | |
2576 | ||
996ae0b0 RK |
2577 | return; |
2578 | ||
2579 | -- Here we definitely have a bad indexing | |
2580 | ||
2581 | else | |
2582 | if Nkind (Parent (N)) = N_Requeue_Statement | |
6e73e3ab | 2583 | and then Present (Pent) and then Ekind (Pent) = E_Entry |
996ae0b0 RK |
2584 | then |
2585 | Error_Msg_N | |
2586 | ("REQUEUE does not permit parameters", First (Exprs)); | |
2587 | ||
2588 | elsif Is_Entity_Name (P) | |
2589 | and then Etype (P) = Standard_Void_Type | |
2590 | then | |
0c6826a5 | 2591 | Error_Msg_NE ("incorrect use of &", P, Entity (P)); |
996ae0b0 RK |
2592 | |
2593 | else | |
2594 | Error_Msg_N ("array type required in indexed component", P); | |
2595 | end if; | |
2596 | ||
2597 | Set_Etype (N, Any_Type); | |
2598 | return; | |
2599 | end if; | |
2600 | ||
2601 | Index := First_Index (Array_Type); | |
996ae0b0 RK |
2602 | while Present (Index) and then Present (Exp) loop |
2603 | if not Has_Compatible_Type (Exp, Etype (Index)) then | |
2604 | Wrong_Type (Exp, Etype (Index)); | |
2605 | Set_Etype (N, Any_Type); | |
2606 | return; | |
2607 | end if; | |
2608 | ||
2609 | Next_Index (Index); | |
2610 | Next (Exp); | |
2611 | end loop; | |
2612 | ||
2613 | Set_Etype (N, Component_Type (Array_Type)); | |
44a10091 | 2614 | Check_Implicit_Dereference (N, Etype (N)); |
996ae0b0 RK |
2615 | |
2616 | if Present (Index) then | |
2617 | Error_Msg_N | |
2618 | ("too few subscripts in array reference", First (Exprs)); | |
2619 | ||
2620 | elsif Present (Exp) then | |
2621 | Error_Msg_N ("too many subscripts in array reference", Exp); | |
2622 | end if; | |
2623 | end if; | |
996ae0b0 RK |
2624 | end Process_Indexed_Component; |
2625 | ||
2626 | ---------------------------------------- | |
2627 | -- Process_Indexed_Component_Or_Slice -- | |
2628 | ---------------------------------------- | |
2629 | ||
2630 | procedure Process_Indexed_Component_Or_Slice is | |
2631 | begin | |
2632 | Exp := First (Exprs); | |
996ae0b0 RK |
2633 | while Present (Exp) loop |
2634 | Analyze_Expression (Exp); | |
2635 | Next (Exp); | |
2636 | end loop; | |
2637 | ||
2638 | Exp := First (Exprs); | |
2639 | ||
0c6826a5 AC |
2640 | -- If one index is present, and it is a subtype name, then the node |
2641 | -- denotes a slice (note that the case of an explicit range for a | |
2642 | -- slice was already built as an N_Slice node in the first place, | |
2643 | -- so that case is not handled here). | |
996ae0b0 RK |
2644 | |
2645 | -- We use a replace rather than a rewrite here because this is one | |
2646 | -- of the cases in which the tree built by the parser is plain wrong. | |
2647 | ||
2648 | if No (Next (Exp)) | |
2649 | and then Is_Entity_Name (Exp) | |
2650 | and then Is_Type (Entity (Exp)) | |
2651 | then | |
2652 | Replace (N, | |
2653 | Make_Slice (Sloc (N), | |
2654 | Prefix => P, | |
2655 | Discrete_Range => New_Copy (Exp))); | |
2656 | Analyze (N); | |
2657 | ||
2658 | -- Otherwise (more than one index present, or single index is not | |
2659 | -- a subtype name), then we have the indexed component case. | |
2660 | ||
2661 | else | |
2662 | Process_Indexed_Component; | |
2663 | end if; | |
2664 | end Process_Indexed_Component_Or_Slice; | |
2665 | ||
2666 | ------------------------------------------ | |
2667 | -- Process_Overloaded_Indexed_Component -- | |
2668 | ------------------------------------------ | |
2669 | ||
2670 | procedure Process_Overloaded_Indexed_Component is | |
2671 | Exp : Node_Id; | |
2672 | I : Interp_Index; | |
2673 | It : Interp; | |
2674 | Typ : Entity_Id; | |
2675 | Index : Node_Id; | |
2676 | Found : Boolean; | |
2677 | ||
2678 | begin | |
2679 | Set_Etype (N, Any_Type); | |
996ae0b0 | 2680 | |
4c46b835 | 2681 | Get_First_Interp (P, I, It); |
996ae0b0 RK |
2682 | while Present (It.Nam) loop |
2683 | Typ := It.Typ; | |
2684 | ||
2685 | if Is_Access_Type (Typ) then | |
2686 | Typ := Designated_Type (Typ); | |
324ac540 AC |
2687 | Error_Msg_NW |
2688 | (Warn_On_Dereference, "?d?implicit dereference", N); | |
996ae0b0 RK |
2689 | end if; |
2690 | ||
2691 | if Is_Array_Type (Typ) then | |
2692 | ||
2693 | -- Got a candidate: verify that index types are compatible | |
2694 | ||
2695 | Index := First_Index (Typ); | |
2696 | Found := True; | |
996ae0b0 | 2697 | Exp := First (Exprs); |
996ae0b0 RK |
2698 | while Present (Index) and then Present (Exp) loop |
2699 | if Has_Compatible_Type (Exp, Etype (Index)) then | |
2700 | null; | |
2701 | else | |
2702 | Found := False; | |
2703 | Remove_Interp (I); | |
2704 | exit; | |
2705 | end if; | |
2706 | ||
2707 | Next_Index (Index); | |
2708 | Next (Exp); | |
2709 | end loop; | |
2710 | ||
2711 | if Found and then No (Index) and then No (Exp) then | |
44a10091 AC |
2712 | declare |
2713 | CT : constant Entity_Id := | |
2714 | Base_Type (Component_Type (Typ)); | |
2715 | begin | |
2716 | Add_One_Interp (N, CT, CT); | |
2717 | Check_Implicit_Dereference (N, CT); | |
2718 | end; | |
996ae0b0 | 2719 | end if; |
57a8057a | 2720 | |
50878404 | 2721 | elsif Try_Container_Indexing (N, P, Exprs) then |
57a8057a AC |
2722 | return; |
2723 | ||
996ae0b0 RK |
2724 | end if; |
2725 | ||
2726 | Get_Next_Interp (I, It); | |
2727 | end loop; | |
2728 | ||
2729 | if Etype (N) = Any_Type then | |
ad6b5b00 | 2730 | Error_Msg_N ("no legal interpretation for indexed component", N); |
996ae0b0 RK |
2731 | Set_Is_Overloaded (N, False); |
2732 | end if; | |
2733 | ||
2734 | End_Interp_List; | |
2735 | end Process_Overloaded_Indexed_Component; | |
2736 | ||
4c46b835 | 2737 | -- Start of processing for Analyze_Indexed_Component_Form |
996ae0b0 RK |
2738 | |
2739 | begin | |
2740 | -- Get name of array, function or type | |
2741 | ||
2742 | Analyze (P); | |
d469eabe | 2743 | |
24778dbb AC |
2744 | -- If P is an explicit dereference whose prefix is of a remote access- |
2745 | -- to-subprogram type, then N has already been rewritten as a subprogram | |
2746 | -- call and analyzed. | |
2747 | ||
d3b00ce3 | 2748 | if Nkind (N) in N_Subprogram_Call then |
24778dbb | 2749 | return; |
d469eabe | 2750 | |
24778dbb AC |
2751 | -- When the prefix is attribute 'Loop_Entry and the sole expression of |
2752 | -- the indexed component denotes a loop name, the indexed form is turned | |
2753 | -- into an attribute reference. | |
fbf5a39b | 2754 | |
24778dbb AC |
2755 | elsif Nkind (N) = N_Attribute_Reference |
2756 | and then Attribute_Name (N) = Name_Loop_Entry | |
2757 | then | |
fbf5a39b AC |
2758 | return; |
2759 | end if; | |
2760 | ||
2761 | pragma Assert (Nkind (N) = N_Indexed_Component); | |
2762 | ||
996ae0b0 RK |
2763 | P_T := Base_Type (Etype (P)); |
2764 | ||
878f708a | 2765 | if Is_Entity_Name (P) and then Present (Entity (P)) then |
996ae0b0 RK |
2766 | U_N := Entity (P); |
2767 | ||
aab883ec | 2768 | if Is_Type (U_N) then |
996ae0b0 | 2769 | |
4c46b835 | 2770 | -- Reformat node as a type conversion |
996ae0b0 RK |
2771 | |
2772 | E := Remove_Head (Exprs); | |
2773 | ||
2774 | if Present (First (Exprs)) then | |
2775 | Error_Msg_N | |
2776 | ("argument of type conversion must be single expression", N); | |
2777 | end if; | |
2778 | ||
2779 | Change_Node (N, N_Type_Conversion); | |
2780 | Set_Subtype_Mark (N, P); | |
2781 | Set_Etype (N, U_N); | |
2782 | Set_Expression (N, E); | |
2783 | ||
2784 | -- After changing the node, call for the specific Analysis | |
2785 | -- routine directly, to avoid a double call to the expander. | |
2786 | ||
2787 | Analyze_Type_Conversion (N); | |
2788 | return; | |
2789 | end if; | |
2790 | ||
2791 | if Is_Overloadable (U_N) then | |
2792 | Process_Function_Call; | |
2793 | ||
2794 | elsif Ekind (Etype (P)) = E_Subprogram_Type | |
2795 | or else (Is_Access_Type (Etype (P)) | |
2796 | and then | |
bce79204 AC |
2797 | Ekind (Designated_Type (Etype (P))) = |
2798 | E_Subprogram_Type) | |
996ae0b0 RK |
2799 | then |
2800 | -- Call to access_to-subprogram with possible implicit dereference | |
2801 | ||
2802 | Process_Function_Call; | |
2803 | ||
fbf5a39b AC |
2804 | elsif Is_Generic_Subprogram (U_N) then |
2805 | ||
4c46b835 | 2806 | -- A common beginner's (or C++ templates fan) error |
996ae0b0 RK |
2807 | |
2808 | Error_Msg_N ("generic subprogram cannot be called", N); | |
2809 | Set_Etype (N, Any_Type); | |
2810 | return; | |
2811 | ||
2812 | else | |
2813 | Process_Indexed_Component_Or_Slice; | |
2814 | end if; | |
2815 | ||
2816 | -- If not an entity name, prefix is an expression that may denote | |
2817 | -- an array or an access-to-subprogram. | |
2818 | ||
2819 | else | |
fbf5a39b | 2820 | if Ekind (P_T) = E_Subprogram_Type |
996ae0b0 RK |
2821 | or else (Is_Access_Type (P_T) |
2822 | and then | |
bce79204 | 2823 | Ekind (Designated_Type (P_T)) = E_Subprogram_Type) |
996ae0b0 RK |
2824 | then |
2825 | Process_Function_Call; | |
2826 | ||
2827 | elsif Nkind (P) = N_Selected_Component | |
3d918396 | 2828 | and then Present (Entity (Selector_Name (P))) |
ffe9aba8 | 2829 | and then Is_Overloadable (Entity (Selector_Name (P))) |
996ae0b0 RK |
2830 | then |
2831 | Process_Function_Call; | |
2832 | ||
3d918396 AC |
2833 | -- In ASIS mode within a generic, a prefixed call is analyzed and |
2834 | -- partially rewritten but the original indexed component has not | |
2835 | -- yet been rewritten as a call. Perform the replacement now. | |
2836 | ||
2837 | elsif Nkind (P) = N_Selected_Component | |
2838 | and then Nkind (Parent (P)) = N_Function_Call | |
2839 | and then ASIS_Mode | |
2840 | then | |
2841 | Rewrite (N, Parent (P)); | |
2842 | Analyze (N); | |
2843 | ||
996ae0b0 RK |
2844 | else |
2845 | -- Indexed component, slice, or a call to a member of a family | |
2846 | -- entry, which will be converted to an entry call later. | |
fbf5a39b | 2847 | |
996ae0b0 RK |
2848 | Process_Indexed_Component_Or_Slice; |
2849 | end if; | |
2850 | end if; | |
5f49133f AC |
2851 | |
2852 | Analyze_Dimension (N); | |
996ae0b0 RK |
2853 | end Analyze_Indexed_Component_Form; |
2854 | ||
2855 | ------------------------ | |
2856 | -- Analyze_Logical_Op -- | |
2857 | ------------------------ | |
2858 | ||
2859 | procedure Analyze_Logical_Op (N : Node_Id) is | |
2860 | L : constant Node_Id := Left_Opnd (N); | |
2861 | R : constant Node_Id := Right_Opnd (N); | |
2862 | Op_Id : Entity_Id := Entity (N); | |
2863 | ||
2864 | begin | |
2865 | Set_Etype (N, Any_Type); | |
2866 | Candidate_Type := Empty; | |
2867 | ||
2868 | Analyze_Expression (L); | |
2869 | Analyze_Expression (R); | |
2870 | ||
2871 | if Present (Op_Id) then | |
2872 | ||
2873 | if Ekind (Op_Id) = E_Operator then | |
2874 | Find_Boolean_Types (L, R, Op_Id, N); | |
2875 | else | |
2876 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
2877 | end if; | |
2878 | ||
2879 | else | |
2880 | Op_Id := Get_Name_Entity_Id (Chars (N)); | |
996ae0b0 RK |
2881 | while Present (Op_Id) loop |
2882 | if Ekind (Op_Id) = E_Operator then | |
2883 | Find_Boolean_Types (L, R, Op_Id, N); | |
2884 | else | |
2885 | Analyze_User_Defined_Binary_Op (N, Op_Id); | |
2886 | end if; | |
2887 | ||
2888 | Op_Id := Homonym (Op_Id); | |
2889 | end loop; | |
2890 | end if; | |
2891 | ||
2892 | Operator_Check (N); | |
22e89283 | 2893 | Check_Function_Writable_Actuals (N); |
996ae0b0 RK |
2894 | end Analyze_Logical_Op; |
2895 | ||
2896 | --------------------------- | |
2897 | -- Analyze_Membership_Op -- | |
2898 | --------------------------- | |
2899 | ||
2900 | procedure Analyze_Membership_Op (N : Node_Id) is | |
66150d01 | 2901 | Loc : constant Source_Ptr := Sloc (N); |
f2acf80c AC |
2902 | L : constant Node_Id := Left_Opnd (N); |
2903 | R : constant Node_Id := Right_Opnd (N); | |
996ae0b0 RK |
2904 | |
2905 | Index : Interp_Index; | |
2906 | It : Interp; | |
2907 | Found : Boolean := False; | |
2908 | I_F : Interp_Index; | |
2909 | T_F : Entity_Id; | |
2910 | ||
2911 | procedure Try_One_Interp (T1 : Entity_Id); | |
2912 | -- Routine to try one proposed interpretation. Note that the context | |
2913 | -- of the operation plays no role in resolving the arguments, so that | |
2914 | -- if there is more than one interpretation of the operands that is | |
2915 | -- compatible with a membership test, the operation is ambiguous. | |
2916 | ||
4c46b835 AC |
2917 | -------------------- |
2918 | -- Try_One_Interp -- | |
2919 | -------------------- | |
2920 | ||
996ae0b0 RK |
2921 | procedure Try_One_Interp (T1 : Entity_Id) is |
2922 | begin | |
2923 | if Has_Compatible_Type (R, T1) then | |
2924 | if Found | |
2925 | and then Base_Type (T1) /= Base_Type (T_F) | |
2926 | then | |
2927 | It := Disambiguate (L, I_F, Index, Any_Type); | |
2928 | ||
2929 | if It = No_Interp then | |
2930 | Ambiguous_Operands (N); | |
2931 | Set_Etype (L, Any_Type); | |
2932 | return; | |
2933 | ||
2934 | else | |
2935 | T_F := It.Typ; | |
2936 | end if; | |
2937 | ||
2938 | else | |
2939 | Found := True; | |
2940 | T_F := T1; | |
2941 | I_F := Index; | |
2942 | end if; | |
2943 | ||
2944 | Set_Etype (L, T_F); | |
2945 | end if; | |
996ae0b0 RK |
2946 | end Try_One_Interp; |
2947 | ||
197e4514 AC |
2948 | procedure Analyze_Set_Membership; |
2949 | -- If a set of alternatives is present, analyze each and find the | |
2950 | -- common type to which they must all resolve. | |
2951 | ||
2952 | ---------------------------- | |
2953 | -- Analyze_Set_Membership -- | |
2954 | ---------------------------- | |
2955 | ||
2956 | procedure Analyze_Set_Membership is | |
2957 | Alt : Node_Id; | |
2958 | Index : Interp_Index; | |
2959 | It : Interp; | |
197e4514 AC |
2960 | Candidate_Interps : Node_Id; |
2961 | Common_Type : Entity_Id := Empty; | |
2962 | ||
2963 | begin | |
e917e3b8 | 2964 | if Comes_From_Source (N) then |
c86cf714 | 2965 | Check_Compiler_Unit ("set membership", N); |
e917e3b8 AC |
2966 | end if; |
2967 | ||
197e4514 AC |
2968 | Analyze (L); |
2969 | Candidate_Interps := L; | |
2970 | ||
2971 | if not Is_Overloaded (L) then | |
2972 | Common_Type := Etype (L); | |
2973 | ||
2974 | Alt := First (Alternatives (N)); | |
2975 | while Present (Alt) loop | |
2976 | Analyze (Alt); | |
2977 | ||
2978 | if not Has_Compatible_Type (Alt, Common_Type) then | |
2979 | Wrong_Type (Alt, Common_Type); | |
2980 | end if; | |
2981 | ||
2982 | Next (Alt); | |
2983 | end loop; | |
2984 | ||
2985 | else | |
2986 | Alt := First (Alternatives (N)); | |
2987 | while Present (Alt) loop | |
2988 | Analyze (Alt); | |
2989 | if not Is_Overloaded (Alt) then | |
2990 | Common_Type := Etype (Alt); | |
2991 | ||
2992 | else | |
2993 | Get_First_Interp (Alt, Index, It); | |
2994 | while Present (It.Typ) loop | |
442c0581 RD |
2995 | if not |
2996 | Has_Compatible_Type (Candidate_Interps, It.Typ) | |
197e4514 AC |
2997 | then |
2998 | Remove_Interp (Index); | |
2999 | end if; | |
442c0581 | 3000 | |
197e4514 AC |
3001 | Get_Next_Interp (Index, It); |
3002 | end loop; | |
3003 | ||
3004 | Get_First_Interp (Alt, Index, It); | |
442c0581 | 3005 | |
197e4514 AC |
3006 | if No (It.Typ) then |
3007 | Error_Msg_N ("alternative has no legal type", Alt); | |
3008 | return; | |
3009 | end if; | |
3010 | ||
442c0581 RD |
3011 | -- If alternative is not overloaded, we have a unique type |
3012 | -- for all of them. | |
197e4514 AC |
3013 | |
3014 | Set_Etype (Alt, It.Typ); | |
6376a3c6 | 3015 | |
c23c86bb AC |
3016 | -- If the alternative is an enumeration literal, use the one |
3017 | -- for this interpretation. | |
6376a3c6 AC |
3018 | |
3019 | if Is_Entity_Name (Alt) then | |
3020 | Set_Entity (Alt, It.Nam); | |
3021 | end if; | |
3022 | ||
197e4514 AC |
3023 | Get_Next_Interp (Index, It); |
3024 | ||
3025 | if No (It.Typ) then | |
3026 | Set_Is_Overloaded (Alt, False); | |
3027 | Common_Type := Etype (Alt); | |
3028 | end if; | |
3029 | ||
3030 | Candidate_Interps := Alt; | |
3031 | end if; | |
3032 | ||
3033 | Next (Alt); | |
3034 | end loop; | |
3035 | end if; | |
3036 | ||
3037 | Set_Etype (N, Standard_Boolean); | |
3038 | ||
3039 | if Present (Common_Type) then | |
3040 | Set_Etype (L, Common_Type); | |
cd1a470a AC |
3041 | |
3042 | -- The left operand may still be overloaded, to be resolved using | |
3043 | -- the Common_Type. | |
197e4514 AC |
3044 | |
3045 | else | |
3046 | Error_Msg_N ("cannot resolve membership operation", N); | |
3047 | end if; | |
3048 | end Analyze_Set_Membership; | |
3049 | ||
996ae0b0 RK |
3050 | -- Start of processing for Analyze_Membership_Op |
3051 | ||
3052 | begin | |
3053 | Analyze_Expression (L); | |
3054 | ||
0d8b6803 | 3055 | if No (R) then |
9f46106a JM |
3056 | pragma Assert (Ada_Version >= Ada_2012); |
3057 | Analyze_Set_Membership; | |
3058 | Check_Function_Writable_Actuals (N); | |
197e4514 AC |
3059 | return; |
3060 | end if; | |
3061 | ||
996ae0b0 RK |
3062 | if Nkind (R) = N_Range |
3063 | or else (Nkind (R) = N_Attribute_Reference | |
3064 | and then Attribute_Name (R) = Name_Range) | |
3065 | then | |
3066 | Analyze (R); | |
3067 | ||
3068 | if not Is_Overloaded (L) then | |
3069 | Try_One_Interp (Etype (L)); | |
3070 | ||
3071 | else | |
3072 | Get_First_Interp (L, Index, It); | |
996ae0b0 RK |
3073 | while Present (It.Typ) loop |
3074 | Try_One_Interp (It.Typ); | |
3075 | Get_Next_Interp (Index, It); | |
3076 | end loop; | |
3077 | end if; | |
3078 | ||
f6b5dc8e | 3079 | -- If not a range, it can be a subtype mark, or else it is a degenerate |
b0186f71 AC |
3080 | -- membership test with a singleton value, i.e. a test for equality, |
3081 | -- if the types are compatible. | |
996ae0b0 RK |
3082 | |
3083 | else | |
66150d01 | 3084 | Analyze (R); |
7483c888 | 3085 | |
66150d01 AC |
3086 | if Is_Entity_Name (R) |
3087 | and then Is_Type (Entity (R)) | |
3088 | then | |
3089 | Find_Type (R); | |
996ae0b0 | 3090 | Check_Fully_Declared (Entity (R), R); |
66150d01 | 3091 | |
b0186f71 AC |
3092 | elsif Ada_Version >= Ada_2012 |
3093 | and then Has_Compatible_Type (R, Etype (L)) | |
3094 | then | |
66150d01 AC |
3095 | if Nkind (N) = N_In then |
3096 | Rewrite (N, | |
3097 | Make_Op_Eq (Loc, | |
3098 | Left_Opnd => L, | |
3099 | Right_Opnd => R)); | |
3100 | else | |
3101 | Rewrite (N, | |
3102 | Make_Op_Ne (Loc, | |
3103 | Left_Opnd => L, | |
3104 | Right_Opnd => R)); | |
3105 | end if; | |
3106 | ||
3107 | Analyze (N); | |
3108 | return; | |
3109 | ||
3110 | else | |
b0186f71 AC |
3111 | -- In all versions of the language, if we reach this point there |
3112 | -- is a previous error that will be diagnosed below. | |
66150d01 AC |
3113 | |
3114 | Find_Type (R); | |
996ae0b0 RK |
3115 | end if; |
3116 | end if; | |
3117 | ||
3118 | -- Compatibility between expression and subtype mark or range is | |
3119 | -- checked during resolution. The result of the operation is Boolean | |
3120 | -- in any case. | |
3121 | ||
3122 | Set_Etype (N, Standard_Boolean); | |
fe45e59e ES |
3123 | |
3124 | if Comes_From_Source (N) | |
197e4514 | 3125 | and then Present (Right_Opnd (N)) |
fe45e59e ES |
3126 | and then Is_CPP_Class (Etype (Etype (Right_Opnd (N)))) |
3127 | then | |
3128 | Error_Msg_N ("membership test not applicable to cpp-class types", N); | |
3129 | end if; | |
288cbbbd | 3130 | |
22e89283 | 3131 | Check_Function_Writable_Actuals (N); |
996ae0b0 RK |
3132 | end Analyze_Membership_Op; |
3133 | ||
b727a82b AC |
3134 | ----------------- |
3135 | -- Analyze_Mod -- | |
3136 | ----------------- | |
3137 | ||
3138 | procedure Analyze_Mod (N : Node_Id) is | |
3139 | begin | |
3140 | -- A special warning check, if we have an expression of the form: | |
3141 | -- expr mod 2 * literal | |
3142 | -- where literal is 64 or less, then probably what was meant was | |
3143 | -- expr mod 2 ** literal | |
3144 | -- so issue an appropriate warning. | |
3145 | ||
3146 | if Warn_On_Suspicious_Modulus_Value | |
3147 | and then Nkind (Right_Opnd (N)) = N_Integer_Literal | |
3148 | and then Intval (Right_Opnd (N)) = Uint_2 | |
3149 | and then Nkind (Parent (N)) = N_Op_Multiply | |
3150 | and then Nkind (Right_Opnd (Parent (N))) = N_Integer_Literal | |
3151 | and then Intval (Right_Opnd (Parent (N))) <= Uint_64 | |
3152 | then | |
3153 | Error_Msg_N | |
324ac540 | 3154 | ("suspicious MOD value, was '*'* intended'??M?", Parent (N)); |
b727a82b AC |
3155 | end if; |
3156 | ||
3157 | -- Remaining processing is same as for other arithmetic operators | |
3158 | ||
3159 | Analyze_Arithmetic_Op (N); | |
3160 | end Analyze_Mod; | |
3161 | ||
996ae0b0 RK |
3162 | ---------------------- |
3163 | -- Analyze_Negation -- | |
3164 | ---------------------- | |
3165 | ||
3166 | procedure Analyze_Negation (N : Node_Id) is | |
3167 | R : constant Node_Id := Right_Opnd (N); | |
3168 | Op_Id : Entity_Id := Entity (N); | |
3169 | ||
3170 | begin | |
3171 | Set_Etype (N, Any_Type); | |
3172 | Candidate_Type := Empty; | |
3173 | ||
3174 | Analyze_Expression (R); | |
3175 | ||
3176 | if Present (Op_Id) then | |
3177 | if Ekind (Op_Id) = E_Operator then | |
3178 | Find_Negation_Types (R, Op_Id, N); | |
3179 | else | |
3180 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
3181 | end if; | |
3182 | ||
3183 | else | |
3184 | Op_Id := Get_Name_Entity_Id (Chars (N)); | |
996ae0b0 RK |
3185 | while Present (Op_Id) loop |
3186 | if Ekind (Op_Id) = E_Operator then | |
3187 | Find_Negation_Types (R, Op_Id, N); | |
3188 | else | |
3189 | Analyze_User_Defined_Unary_Op (N, Op_Id); | |
3190 | end if; | |
3191 | ||
3192 | Op_Id := Homonym (Op_Id); | |
3193 | end loop; | |
3194 | end if; | |
3195 | ||
3196 | Operator_Check (N); | |
3197 | end Analyze_Negation; | |
3198 | ||
15ce9ca2 AC |
3199 | ------------------ |
3200 | -- Analyze_Null -- | |
3201 | ------------------ | |
996ae0b0 RK |
3202 | |
3203 | procedure Analyze_Null (N : Node_Id) is | |
3204 | begin | |
ce5ba43a | 3205 | Check_SPARK_05_Restriction ("null is not allowed", N); |
1d801f21 | 3206 | |
996ae0b0 RK |
3207 | Set_Etype (N, Any_Access); |
3208 | end Analyze_Null; | |
3209 | ||
3210 | ---------------------- | |
3211 | -- Analyze_One_Call -- | |
3212 | ---------------------- | |
3213 | ||
3214 | procedure Analyze_One_Call | |
ec6078e3 ES |
3215 | (N : Node_Id; |
3216 | Nam : Entity_Id; | |
3217 | Report : Boolean; | |
3218 | Success : out Boolean; | |
3219 | Skip_First : Boolean := False) | |
996ae0b0 | 3220 | is |
d469eabe HK |
3221 | Actuals : constant List_Id := Parameter_Associations (N); |
3222 | Prev_T : constant Entity_Id := Etype (N); | |
3223 | ||
12390626 ES |
3224 | -- Recognize cases of prefixed calls that have been rewritten in |
3225 | -- various ways. The simplest case is a rewritten selected component, | |
3226 | -- but it can also be an already-examined indexed component, or a | |
3227 | -- prefix that is itself a rewritten prefixed call that is in turn | |
3228 | -- an indexed call (the syntactic ambiguity involving the indexing of | |
3229 | -- a function with defaulted parameters that returns an array). | |
3230 | -- A flag Maybe_Indexed_Call might be useful here ??? | |
3231 | ||
aab883ec ES |
3232 | Must_Skip : constant Boolean := Skip_First |
3233 | or else Nkind (Original_Node (N)) = N_Selected_Component | |
3234 | or else | |
3235 | (Nkind (Original_Node (N)) = N_Indexed_Component | |
e5fc0179 HK |
3236 | and then Nkind (Prefix (Original_Node (N))) = |
3237 | N_Selected_Component) | |
12390626 ES |
3238 | or else |
3239 | (Nkind (Parent (N)) = N_Function_Call | |
e5fc0179 HK |
3240 | and then Is_Array_Type (Etype (Name (N))) |
3241 | and then Etype (Original_Node (N)) = | |
3242 | Component_Type (Etype (Name (N))) | |
3243 | and then Nkind (Original_Node (Parent (N))) = | |
3244 | N_Selected_Component); | |
12390626 | 3245 | |
aab883ec ES |
3246 | -- The first formal must be omitted from the match when trying to find |
3247 | -- a primitive operation that is a possible interpretation, and also | |
3248 | -- after the call has been rewritten, because the corresponding actual | |
3249 | -- is already known to be compatible, and because this may be an | |
3250 | -- indexing of a call with default parameters. | |
3251 | ||
2f0a921f | 3252 | First_Form : Entity_Id; |
53cf4600 ES |
3253 | Formal : Entity_Id; |
3254 | Actual : Node_Id; | |
3255 | Is_Indexed : Boolean := False; | |
3256 | Is_Indirect : Boolean := False; | |
3257 | Subp_Type : constant Entity_Id := Etype (Nam); | |
3258 | Norm_OK : Boolean; | |
996ae0b0 | 3259 | |
1d2d8a8f AC |
3260 | function Compatible_Types_In_Predicate |
3261 | (T1 : Entity_Id; | |
3262 | T2 : Entity_Id) return Boolean; | |
3263 | -- For an Ada 2012 predicate or invariant, a call may mention an | |
3264 | -- incomplete type, while resolution of the corresponding predicate | |
3265 | -- function may see the full view, as a consequence of the delayed | |
3266 | -- resolution of the corresponding expressions. This may occur in | |
3267 | -- the body of a predicate function, or in a call to such. Anomalies | |
3268 | -- involving private and full views can also happen. In each case, | |
3269 | -- rewrite node or add conversions to remove spurious type errors. | |
3270 | ||
3271 | procedure Indicate_Name_And_Type; | |
3272 | -- If candidate interpretation matches, indicate name and type of result | |
3273 | -- on call node. | |
3274 | ||
157a9bf5 ES |
3275 | function Operator_Hidden_By (Fun : Entity_Id) return Boolean; |
3276 | -- There may be a user-defined operator that hides the current | |
3277 | -- interpretation. We must check for this independently of the | |
3278 | -- analysis of the call with the user-defined operation, because | |
3279 | -- the parameter names may be wrong and yet the hiding takes place. | |
3280 | -- This fixes a problem with ACATS test B34014O. | |
3281 | -- | |
3282 | -- When the type Address is a visible integer type, and the DEC | |
3283 | -- system extension is visible, the predefined operator may be | |
3284 | -- hidden as well, by one of the address operations in auxdec. | |
3285 | -- Finally, The abstract operations on address do not hide the | |
3286 | -- predefined operator (this is the purpose of making them abstract). | |
3287 | ||
1d2d8a8f AC |
3288 | ----------------------------------- |
3289 | -- Compatible_Types_In_Predicate -- | |
3290 | ----------------------------------- | |
3291 | ||
3292 | function Compatible_Types_In_Predicate | |
3293 | (T1 : Entity_Id; | |
3294 | T2 : Entity_Id) return Boolean | |
3295 | is | |
3296 | function Common_Type (T : Entity_Id) return Entity_Id; | |
3297 | -- Find non-private full view if any, without going to ancestor type | |
3298 | -- (as opposed to Underlying_Type). | |
3299 | ||
3300 | ----------------- | |
3301 | -- Common_Type -- | |
3302 | ----------------- | |
3303 | ||
3304 | function Common_Type (T : Entity_Id) return Entity_Id is | |
3305 | begin | |
3306 | if Is_Private_Type (T) and then Present (Full_View (T)) then | |
3307 | return Base_Type (Full_View (T)); | |
3308 | else | |
3309 | return Base_Type (T); | |
3310 | end if; | |
3311 | end Common_Type; | |
3312 | ||
3313 | -- Start of processing for Compatible_Types_In_Predicate | |
3314 | ||
3315 | begin | |
3316 | if (Ekind (Current_Scope) = E_Function | |
3317 | and then Is_Predicate_Function (Current_Scope)) | |
3318 | or else | |
3319 | (Ekind (Nam) = E_Function | |
3320 | and then Is_Predicate_Function (Nam)) | |
3321 | then | |
3322 | if Is_Incomplete_Type (T1) | |
3323 | and then Present (Full_View (T1)) | |
3324 | and then Full_View (T1) = T2 | |
3325 | then | |
3326 | Set_Etype (Formal, Etype (Actual)); | |
3327 | return True; | |
3328 | ||
3329 | elsif Common_Type (T1) = Common_Type (T2) then | |
3330 | Rewrite (Actual, Unchecked_Convert_To (Etype (Formal), Actual)); | |
3331 | return True; | |
3332 | ||
3333 | else | |
3334 | return False; | |
3335 | end if; | |
3336 | ||
3337 | else | |
3338 | return False; | |
3339 | end if; | |
3340 | end Compatible_Types_In_Predicate; | |
996ae0b0 | 3341 | |
fbf5a39b AC |
3342 | ---------------------------- |
3343 | -- Indicate_Name_And_Type -- | |
3344 | ---------------------------- | |
996ae0b0 | 3345 | |
fbf5a39b | 3346 | procedure Indicate_Name_And_Type is |
996ae0b0 RK |
3347 | begin |
3348 | Add_One_Interp (N, Nam, Etype (Nam)); | |
44a10091 | 3349 | Check_Implicit_Dereference (N, Etype (Nam)); |
996ae0b0 RK |
3350 | Success := True; |
3351 | ||
3352 | -- If the prefix of the call is a name, indicate the entity | |
3353 | -- being called. If it is not a name, it is an expression that | |
3354 | -- denotes an access to subprogram or else an entry or family. In | |
3355 | -- the latter case, the name is a selected component, and the entity | |
3356 | -- being called is noted on the selector. | |
3357 | ||
3358 | if not Is_Type (Nam) then | |
a3f2babd | 3359 | if Is_Entity_Name (Name (N)) then |
996ae0b0 | 3360 | Set_Entity (Name (N), Nam); |
d9307840 | 3361 | Set_Etype (Name (N), Etype (Nam)); |
996ae0b0 RK |
3362 | |
3363 | elsif Nkind (Name (N)) = N_Selected_Component then | |
3364 | Set_Entity (Selector_Name (Name (N)), Nam); | |
3365 | end if; | |
3366 | end if; | |
3367 | ||
3368 | if Debug_Flag_E and not Report then | |
3369 | Write_Str (" Overloaded call "); | |
3370 | Write_Int (Int (N)); | |
3371 | Write_Str (" compatible with "); | |
3372 | Write_Int (Int (Nam)); | |
3373 | Write_Eol; | |
3374 | end if; | |
fbf5a39b | 3375 | end Indicate_Name_And_Type; |
996ae0b0 | 3376 | |
157a9bf5 ES |
3377 | ------------------------ |
3378 | -- Operator_Hidden_By -- | |
3379 | ------------------------ | |
3380 | ||
3381 | function Operator_Hidden_By (Fun : Entity_Id) return Boolean is | |
3382 | Act1 : constant Node_Id := First_Actual (N); | |
3383 | Act2 : constant Node_Id := Next_Actual (Act1); | |
3384 | Form1 : constant Entity_Id := First_Formal (Fun); | |
3385 | Form2 : constant Entity_Id := Next_Formal (Form1); | |
3386 | ||
3387 | begin | |
e4deba8e | 3388 | if Ekind (Fun) /= E_Function or else Is_Abstract_Subprogram (Fun) then |
157a9bf5 ES |
3389 | return False; |
3390 | ||
3391 | elsif not Has_Compatible_Type (Act1, Etype (Form1)) then | |
3392 | return False; | |
3393 | ||
3394 | elsif Present (Form2) then | |
e4deba8e RD |
3395 | if No (Act2) |
3396 | or else not Has_Compatible_Type (Act2, Etype (Form2)) | |
157a9bf5 ES |
3397 | then |
3398 | return False; | |
3399 | end if; | |
3400 | ||
3401 | elsif Present (Act2) then | |
3402 | return False; | |
3403 | end if; | |
3404 | ||
3405 | -- Now we know that the arity of the operator matches the function, | |
3406 | -- and the function call is a valid interpretation. The function | |
3407 | -- hides the operator if it has the right signature, or if one of | |
3408 | -- its operands is a non-abstract operation on Address when this is | |
3409 | -- a visible integer type. | |
3410 | ||
3411 | return Hides_Op (Fun, Nam) | |
d9d25d04 | 3412 | or else Is_Descendant_Of_Address (Etype (Form1)) |
157a9bf5 ES |
3413 | or else |
3414 | (Present (Form2) | |
d9d25d04 | 3415 | and then Is_Descendant_Of_Address (Etype (Form2))); |
157a9bf5 ES |
3416 | end Operator_Hidden_By; |
3417 | ||
996ae0b0 RK |
3418 | -- Start of processing for Analyze_One_Call |
3419 | ||
3420 | begin | |
3421 | Success := False; | |
3422 | ||
157a9bf5 ES |
3423 | -- If the subprogram has no formals or if all the formals have defaults, |
3424 | -- and the return type is an array type, the node may denote an indexing | |
3425 | -- of the result of a parameterless call. In Ada 2005, the subprogram | |
3426 | -- may have one non-defaulted formal, and the call may have been written | |
3427 | -- in prefix notation, so that the rebuilt parameter list has more than | |
3428 | -- one actual. | |
996ae0b0 | 3429 | |
53cf4600 ES |
3430 | if not Is_Overloadable (Nam) |
3431 | and then Ekind (Nam) /= E_Subprogram_Type | |
3432 | and then Ekind (Nam) /= E_Entry_Family | |
3433 | then | |
3434 | return; | |
3435 | end if; | |
3436 | ||
80e59506 | 3437 | -- An indexing requires at least one actual. The name of the call cannot |
4bb9c7b9 AC |
3438 | -- be an implicit indirect call, so it cannot be a generated explicit |
3439 | -- dereference. | |
e1f3cb58 AC |
3440 | |
3441 | if not Is_Empty_List (Actuals) | |
aab883ec ES |
3442 | and then |
3443 | (Needs_No_Actuals (Nam) | |
3444 | or else | |
3445 | (Needs_One_Actual (Nam) | |
e4deba8e | 3446 | and then Present (Next_Actual (First (Actuals))))) |
996ae0b0 | 3447 | then |
4bb9c7b9 AC |
3448 | if Is_Array_Type (Subp_Type) |
3449 | and then | |
3450 | (Nkind (Name (N)) /= N_Explicit_Dereference | |
3451 | or else Comes_From_Source (Name (N))) | |
3452 | then | |
aab883ec | 3453 | Is_Indexed := Try_Indexed_Call (N, Nam, Subp_Type, Must_Skip); |
996ae0b0 RK |
3454 | |
3455 | elsif Is_Access_Type (Subp_Type) | |
3456 | and then Is_Array_Type (Designated_Type (Subp_Type)) | |
3457 | then | |
3458 | Is_Indexed := | |
aab883ec ES |
3459 | Try_Indexed_Call |
3460 | (N, Nam, Designated_Type (Subp_Type), Must_Skip); | |
996ae0b0 | 3461 | |
758c442c | 3462 | -- The prefix can also be a parameterless function that returns an |
f3d57416 | 3463 | -- access to subprogram, in which case this is an indirect call. |
53cf4600 ES |
3464 | -- If this succeeds, an explicit dereference is added later on, |
3465 | -- in Analyze_Call or Resolve_Call. | |
758c442c | 3466 | |
996ae0b0 | 3467 | elsif Is_Access_Type (Subp_Type) |
401093c1 | 3468 | and then Ekind (Designated_Type (Subp_Type)) = E_Subprogram_Type |
996ae0b0 | 3469 | then |
53cf4600 | 3470 | Is_Indirect := Try_Indirect_Call (N, Nam, Subp_Type); |
996ae0b0 RK |
3471 | end if; |
3472 | ||
3473 | end if; | |
3474 | ||
5ff22245 | 3475 | -- If the call has been transformed into a slice, it is of the form |
30783513 | 3476 | -- F (Subtype) where F is parameterless. The node has been rewritten in |
5ff22245 ES |
3477 | -- Try_Indexed_Call and there is nothing else to do. |
3478 | ||
3479 | if Is_Indexed | |
21d7ef70 | 3480 | and then Nkind (N) = N_Slice |
5ff22245 ES |
3481 | then |
3482 | return; | |
3483 | end if; | |
3484 | ||
53cf4600 ES |
3485 | Normalize_Actuals |
3486 | (N, Nam, (Report and not Is_Indexed and not Is_Indirect), Norm_OK); | |
996ae0b0 RK |
3487 | |
3488 | if not Norm_OK then | |
3489 | ||
53cf4600 | 3490 | -- If an indirect call is a possible interpretation, indicate |
80e59506 | 3491 | -- success to the caller. This may be an indexing of an explicit |
4bb9c7b9 | 3492 | -- dereference of a call that returns an access type (see above). |
53cf4600 | 3493 | |
4bb9c7b9 AC |
3494 | if Is_Indirect |
3495 | or else (Is_Indexed | |
3496 | and then Nkind (Name (N)) = N_Explicit_Dereference | |
3497 | and then Comes_From_Source (Name (N))) | |
3498 | then | |
53cf4600 ES |
3499 | Success := True; |
3500 | return; | |
3501 | ||
996ae0b0 RK |
3502 | -- Mismatch in number or names of parameters |
3503 | ||
53cf4600 | 3504 | elsif Debug_Flag_E then |
996ae0b0 RK |
3505 | Write_Str (" normalization fails in call "); |
3506 | Write_Int (Int (N)); | |
3507 | Write_Str (" with subprogram "); | |
3508 | Write_Int (Int (Nam)); | |
3509 | Write_Eol; | |
3510 | end if; | |
3511 | ||
3512 | -- If the context expects a function call, discard any interpretation | |
3513 | -- that is a procedure. If the node is not overloaded, leave as is for | |
3514 | -- better error reporting when type mismatch is found. | |
3515 | ||
3516 | elsif Nkind (N) = N_Function_Call | |
3517 | and then Is_Overloaded (Name (N)) | |
3518 | and then Ekind (Nam) = E_Procedure | |
3519 | then | |
3520 | return; | |
3521 | ||
4c46b835 | 3522 | -- Ditto for function calls in a procedure context |
996ae0b0 RK |
3523 | |
3524 | elsif Nkind (N) = N_Procedure_Call_Statement | |
3525 | and then Is_Overloaded (Name (N)) | |
3526 | and then Etype (Nam) /= Standard_Void_Type | |
3527 | then | |
3528 | return; | |
3529 | ||
fe45e59e | 3530 | elsif No (Actuals) then |
996ae0b0 RK |
3531 | |
3532 | -- If Normalize succeeds, then there are default parameters for | |
3533 | -- all formals. | |
3534 | ||
fbf5a39b | 3535 | Indicate_Name_And_Type; |
996ae0b0 RK |
3536 | |
3537 | elsif Ekind (Nam) = E_Operator then | |
996ae0b0 RK |
3538 | if Nkind (N) = N_Procedure_Call_Statement then |
3539 | return; | |
3540 | end if; | |
3541 | ||
3542 | -- This can occur when the prefix of the call is an operator | |
3543 | -- name or an expanded name whose selector is an operator name. | |
3544 | ||
3545 | Analyze_Operator_Call (N, Nam); | |
3546 | ||
3547 | if Etype (N) /= Prev_T then | |
3548 | ||
157a9bf5 | 3549 | -- Check that operator is not hidden by a function interpretation |
996ae0b0 RK |
3550 | |
3551 | if Is_Overloaded (Name (N)) then | |
3552 | declare | |
3553 | I : Interp_Index; | |
3554 | It : Interp; | |
3555 | ||
3556 | begin | |
3557 | Get_First_Interp (Name (N), I, It); | |
996ae0b0 | 3558 | while Present (It.Nam) loop |
157a9bf5 | 3559 | if Operator_Hidden_By (It.Nam) then |
996ae0b0 RK |
3560 | Set_Etype (N, Prev_T); |
3561 | return; | |
3562 | end if; | |
3563 | ||
3564 | Get_Next_Interp (I, It); | |
3565 | end loop; | |
3566 | end; | |
3567 | end if; | |
3568 | ||
3569 | -- If operator matches formals, record its name on the call. | |
3570 | -- If the operator is overloaded, Resolve will select the | |
3571 | -- correct one from the list of interpretations. The call | |
3572 | -- node itself carries the first candidate. | |
3573 | ||
3574 | Set_Entity (Name (N), Nam); | |
3575 | Success := True; | |
3576 | ||
3577 | elsif Report and then Etype (N) = Any_Type then | |
3578 | Error_Msg_N ("incompatible arguments for operator", N); | |
3579 | end if; | |
3580 | ||
3581 | else | |
3582 | -- Normalize_Actuals has chained the named associations in the | |
3583 | -- correct order of the formals. | |
3584 | ||
2f0a921f JS |
3585 | Actual := First_Actual (N); |
3586 | Formal := First_Formal (Nam); | |
3587 | First_Form := Formal; | |
ec6078e3 | 3588 | |
df3e68b1 HK |
3589 | -- If we are analyzing a call rewritten from object notation, skip |
3590 | -- first actual, which may be rewritten later as an explicit | |
3591 | -- dereference. | |
ec6078e3 | 3592 | |
aab883ec | 3593 | if Must_Skip then |
ec6078e3 ES |
3594 | Next_Actual (Actual); |
3595 | Next_Formal (Formal); | |
3596 | end if; | |
3597 | ||
996ae0b0 | 3598 | while Present (Actual) and then Present (Formal) loop |
fbf5a39b AC |
3599 | if Nkind (Parent (Actual)) /= N_Parameter_Association |
3600 | or else Chars (Selector_Name (Parent (Actual))) = Chars (Formal) | |
996ae0b0 | 3601 | then |
9c510803 ES |
3602 | -- The actual can be compatible with the formal, but we must |
3603 | -- also check that the context is not an address type that is | |
7a5b62b0 | 3604 | -- visibly an integer type. In this case the use of literals is |
d9d25d04 | 3605 | -- illegal, except in the body of descendants of system, where |
7a5b62b0 | 3606 | -- arithmetic operations on address are of course used. |
9c510803 ES |
3607 | |
3608 | if Has_Compatible_Type (Actual, Etype (Formal)) | |
3609 | and then | |
3610 | (Etype (Actual) /= Universal_Integer | |
d9d25d04 | 3611 | or else not Is_Descendant_Of_Address (Etype (Formal)) |
8ab31c0c | 3612 | or else In_Predefined_Unit (N)) |
9c510803 | 3613 | then |
996ae0b0 RK |
3614 | Next_Actual (Actual); |
3615 | Next_Formal (Formal); | |
3616 | ||
061828e3 AC |
3617 | -- In Allow_Integer_Address mode, we allow an actual integer to |
3618 | -- match a formal address type and vice versa. We only do this | |
3619 | -- if we are certain that an error will otherwise be issued | |
3620 | ||
3621 | elsif Address_Integer_Convert_OK | |
3622 | (Etype (Actual), Etype (Formal)) | |
3623 | and then (Report and not Is_Indexed and not Is_Indirect) | |
3624 | then | |
3625 | -- Handle this case by introducing an unchecked conversion | |
3626 | ||
3627 | Rewrite (Actual, | |
3628 | Unchecked_Convert_To (Etype (Formal), | |
3629 | Relocate_Node (Actual))); | |
3630 | Analyze_And_Resolve (Actual, Etype (Formal)); | |
3631 | Next_Actual (Actual); | |
3632 | Next_Formal (Formal); | |
3633 | ||
a8a42b93 AC |
3634 | -- Under relaxed RM semantics silently replace occurrences of |
3635 | -- null by System.Address_Null. We only do this if we know that | |
3636 | -- an error will otherwise be issued. | |
3637 | ||
3638 | elsif Null_To_Null_Address_Convert_OK (Actual, Etype (Formal)) | |
3639 | and then (Report and not Is_Indexed and not Is_Indirect) | |
3640 | then | |
3641 | Replace_Null_By_Null_Address (Actual); | |
3642 | Analyze_And_Resolve (Actual, Etype (Formal)); | |
3643 | Next_Actual (Actual); | |
3644 | Next_Formal (Formal); | |
3645 | ||
1d2d8a8f AC |
3646 | elsif Compatible_Types_In_Predicate |
3647 | (Etype (Formal), Etype (Actual)) | |
a921e83c | 3648 | then |
a921e83c AC |
3649 | Next_Actual (Actual); |
3650 | Next_Formal (Formal); | |
3651 | ||
bb072d1c AC |
3652 | -- Handle failed type check |
3653 | ||
996ae0b0 RK |
3654 | else |
3655 | if Debug_Flag_E then | |
3656 | Write_Str (" type checking fails in call "); | |
3657 | Write_Int (Int (N)); | |
3658 | Write_Str (" with formal "); | |
3659 | Write_Int (Int (Formal)); | |
3660 | Write_Str (" in subprogram "); | |
3661 | Write_Int (Int (Nam)); | |
3662 | Write_Eol; | |
3663 | end if; | |
3664 | ||
061828e3 AC |
3665 | -- Comment needed on the following test??? |
3666 | ||
53cf4600 | 3667 | if Report and not Is_Indexed and not Is_Indirect then |
758c442c GD |
3668 | |
3669 | -- Ada 2005 (AI-251): Complete the error notification | |
8f2eeab7 | 3670 | -- to help new Ada 2005 users. |
758c442c GD |
3671 | |
3672 | if Is_Class_Wide_Type (Etype (Formal)) | |
3673 | and then Is_Interface (Etype (Etype (Formal))) | |
3674 | and then not Interface_Present_In_Ancestor | |
3675 | (Typ => Etype (Actual), | |
3676 | Iface => Etype (Etype (Formal))) | |
3677 | then | |
758c442c | 3678 | Error_Msg_NE |
ec6078e3 | 3679 | ("(Ada 2005) does not implement interface }", |
758c442c GD |
3680 | Actual, Etype (Etype (Formal))); |
3681 | end if; | |
3682 | ||
996ae0b0 RK |
3683 | Wrong_Type (Actual, Etype (Formal)); |
3684 | ||
3685 | if Nkind (Actual) = N_Op_Eq | |
3686 | and then Nkind (Left_Opnd (Actual)) = N_Identifier | |
3687 | then | |
3688 | Formal := First_Formal (Nam); | |
996ae0b0 | 3689 | while Present (Formal) loop |
996ae0b0 | 3690 | if Chars (Left_Opnd (Actual)) = Chars (Formal) then |
4e7a4f6e | 3691 | Error_Msg_N -- CODEFIX |
fbf5a39b | 3692 | ("possible misspelling of `='>`!", Actual); |
996ae0b0 RK |
3693 | exit; |
3694 | end if; | |
3695 | ||
3696 | Next_Formal (Formal); | |
3697 | end loop; | |
3698 | end if; | |
3699 | ||
3700 | if All_Errors_Mode then | |
3701 | Error_Msg_Sloc := Sloc (Nam); | |
3702 | ||
3b42c566 RD |
3703 | if Etype (Formal) = Any_Type then |
3704 | Error_Msg_N | |
3705 | ("there is no legal actual parameter", Actual); | |
3706 | end if; | |
3707 | ||
996ae0b0 RK |
3708 | if Is_Overloadable (Nam) |
3709 | and then Present (Alias (Nam)) | |
3710 | and then not Comes_From_Source (Nam) | |
3711 | then | |
3712 | Error_Msg_NE | |
401093c1 ES |
3713 | ("\\ =='> in call to inherited operation & #!", |
3714 | Actual, Nam); | |
7324bf49 AC |
3715 | |
3716 | elsif Ekind (Nam) = E_Subprogram_Type then | |
3717 | declare | |
3718 | Access_To_Subprogram_Typ : | |
3719 | constant Entity_Id := | |
3720 | Defining_Identifier | |
3721 | (Associated_Node_For_Itype (Nam)); | |
3722 | begin | |
a90bd866 RD |
3723 | Error_Msg_NE |
3724 | ("\\ =='> in call to dereference of &#!", | |
3725 | Actual, Access_To_Subprogram_Typ); | |
7324bf49 AC |
3726 | end; |
3727 | ||
996ae0b0 | 3728 | else |
401093c1 ES |
3729 | Error_Msg_NE |
3730 | ("\\ =='> in call to &#!", Actual, Nam); | |
7324bf49 | 3731 | |
996ae0b0 RK |
3732 | end if; |
3733 | end if; | |
3734 | end if; | |
3735 | ||
3736 | return; | |
3737 | end if; | |
3738 | ||
3739 | else | |
3740 | -- Normalize_Actuals has verified that a default value exists | |
3741 | -- for this formal. Current actual names a subsequent formal. | |
3742 | ||
3743 | Next_Formal (Formal); | |
3744 | end if; | |
3745 | end loop; | |
3746 | ||
2f0a921f JS |
3747 | -- Due to our current model of controlled type expansion we may |
3748 | -- have resolved a user call to a non-visible controlled primitive | |
3749 | -- since these inherited subprograms may be generated in the current | |
4cdd4a33 | 3750 | -- scope. This is a side effect of the need for the expander to be |
2f0a921f JS |
3751 | -- able to resolve internally generated calls. |
3752 | ||
3753 | -- Specifically, the issue appears when predefined controlled | |
3754 | -- operations get called on a type extension whose parent is a | |
3755 | -- private extension completed with a controlled extension - see | |
3756 | -- below: | |
3757 | ||
3758 | -- package X is | |
3759 | -- type Par_Typ is tagged private; | |
3760 | -- private | |
3761 | -- type Par_Typ is new Controlled with null record; | |
3762 | -- end; | |
3763 | -- ... | |
3764 | -- procedure Main is | |
3765 | -- type Ext_Typ is new Par_Typ with null record; | |
3766 | -- Obj : Ext_Typ; | |
3767 | -- begin | |
3768 | -- Finalize (Obj); -- Will improperly resolve | |
3769 | -- end; | |
3770 | ||
3771 | -- To avoid breaking privacy, Is_Hidden gets set elsewhere on such | |
3772 | -- primitives, but we still need to verify that Nam is indeed a | |
3773 | -- controlled subprogram. So, we do that here and issue the | |
3774 | -- appropriate error. | |
3775 | ||
3776 | if Is_Hidden (Nam) | |
3777 | and then not In_Instance | |
3778 | and then not Comes_From_Source (Nam) | |
3779 | and then Comes_From_Source (N) | |
3780 | ||
3781 | -- Verify Nam is a controlled primitive | |
3782 | ||
3783 | and then Nam_In (Chars (Nam), Name_Adjust, | |
3784 | Name_Finalize, | |
3785 | Name_Initialize) | |
3786 | and then Ekind (Nam) = E_Procedure | |
3787 | and then Is_Controlled (Etype (First_Form)) | |
3788 | and then No (Next_Formal (First_Form)) | |
3789 | then | |
3790 | Error_Msg_Node_2 := Etype (First_Form); | |
3791 | Error_Msg_NE ("call to non-visible controlled primitive & on type" | |
3792 | & " &", N, Nam); | |
3793 | end if; | |
3794 | ||
4c46b835 | 3795 | -- On exit, all actuals match |
996ae0b0 | 3796 | |
fbf5a39b | 3797 | Indicate_Name_And_Type; |
996ae0b0 RK |
3798 | end if; |
3799 | end Analyze_One_Call; | |
3800 | ||
15ce9ca2 AC |
3801 | --------------------------- |
3802 | -- Analyze_Operator_Call -- | |
3803 | --------------------------- | |
996ae0b0 RK |
3804 | |
3805 | procedure Analyze_Operator_Call (N : Node_Id; Op_Id : Entity_Id) is | |
3806 | Op_Name : constant Name_Id := Chars (Op_Id); | |
3807 | Act1 : constant Node_Id := First_Actual (N); | |
3808 | Act2 : constant Node_Id := Next_Actual (Act1); | |
3809 | ||
3810 | begin | |
4c46b835 AC |
3811 | -- Binary operator case |
3812 | ||
996ae0b0 RK |
3813 | if Present (Act2) then |
3814 | ||
4c46b835 | 3815 | -- If more than two operands, then not binary operator after all |
996ae0b0 RK |
3816 | |
3817 | if Present (Next_Actual (Act2)) then | |
996ae0b0 | 3818 | return; |
b7539c3b | 3819 | end if; |
996ae0b0 | 3820 | |
b7539c3b | 3821 | -- Otherwise action depends on operator |
996ae0b0 | 3822 | |
b7539c3b | 3823 | case Op_Name is |
d8f43ee6 HK |
3824 | when Name_Op_Add |
3825 | | Name_Op_Divide | |
3826 | | Name_Op_Expon | |
3827 | | Name_Op_Mod | |
3828 | | Name_Op_Multiply | |
3829 | | Name_Op_Rem | |
3830 | | Name_Op_Subtract | |
3831 | => | |
b7539c3b | 3832 | Find_Arithmetic_Types (Act1, Act2, Op_Id, N); |
996ae0b0 | 3833 | |
d8f43ee6 HK |
3834 | when Name_Op_And |
3835 | | Name_Op_Or | |
3836 | | Name_Op_Xor | |
3837 | => | |
b7539c3b | 3838 | Find_Boolean_Types (Act1, Act2, Op_Id, N); |
996ae0b0 | 3839 | |
d8f43ee6 HK |
3840 | when Name_Op_Ge |
3841 | | Name_Op_Gt | |
3842 | | Name_Op_Le | |
3843 | | Name_Op_Lt | |
3844 | => | |
b7539c3b | 3845 | Find_Comparison_Types (Act1, Act2, Op_Id, N); |
996ae0b0 | 3846 | |
d8f43ee6 HK |
3847 | when Name_Op_Eq |
3848 | | Name_Op_Ne | |
3849 | => | |
b7539c3b | 3850 | Find_Equality_Types (Act1, Act2, Op_Id, N); |
996ae0b0 | 3851 | |
d8f43ee6 | 3852 | when Name_Op_Concat => |
b7539c3b | 3853 | Find_Concatenation_Types (Act1, Act2, Op_Id, N); |
996ae0b0 | 3854 | |
b7539c3b AC |
3855 | -- Is this when others, or should it be an abort??? |
3856 | ||
d8f43ee6 | 3857 | when others => |
b7539c3b AC |
3858 | null; |
3859 | end case; | |
996ae0b0 | 3860 | |
4c46b835 | 3861 | -- Unary operator case |
996ae0b0 | 3862 | |
4c46b835 | 3863 | else |
b7539c3b | 3864 | case Op_Name is |
d8f43ee6 HK |
3865 | when Name_Op_Abs |
3866 | | Name_Op_Add | |
3867 | | Name_Op_Subtract | |
3868 | => | |
b7539c3b | 3869 | Find_Unary_Types (Act1, Op_Id, N); |
996ae0b0 | 3870 | |
d8f43ee6 | 3871 | when Name_Op_Not => |
b7539c3b | 3872 | Find_Negation_Types (Act1, Op_Id, N); |
996ae0b0 | 3873 | |
b7539c3b | 3874 | -- Is this when others correct, or should it be an abort??? |
996ae0b0 | 3875 | |
d8f43ee6 | 3876 | when others => |
b7539c3b AC |
3877 | null; |
3878 | end case; | |
996ae0b0 RK |
3879 | end if; |
3880 | end Analyze_Operator_Call; | |
3881 | ||
3882 | ------------------------------------------- | |
3883 | -- Analyze_Overloaded_Selected_Component -- | |
3884 | ------------------------------------------- | |
3885 | ||
3886 | procedure Analyze_Overloaded_Selected_Component (N : Node_Id) is | |
fbf5a39b AC |
3887 | Nam : constant Node_Id := Prefix (N); |
3888 | Sel : constant Node_Id := Selector_Name (N); | |
996ae0b0 | 3889 | Comp : Entity_Id; |
996ae0b0 RK |
3890 | I : Interp_Index; |
3891 | It : Interp; | |
3892 | T : Entity_Id; | |
3893 | ||
3894 | begin | |
4c46b835 | 3895 | Set_Etype (Sel, Any_Type); |
996ae0b0 | 3896 | |
4c46b835 | 3897 | Get_First_Interp (Nam, I, It); |
996ae0b0 RK |
3898 | while Present (It.Typ) loop |
3899 | if Is_Access_Type (It.Typ) then | |
3900 | T := Designated_Type (It.Typ); | |
324ac540 | 3901 | Error_Msg_NW (Warn_On_Dereference, "?d?implicit dereference", N); |
996ae0b0 RK |
3902 | else |
3903 | T := It.Typ; | |
3904 | end if; | |
3905 | ||
95eb8b69 AC |
3906 | -- Locate the component. For a private prefix the selector can denote |
3907 | -- a discriminant. | |
3908 | ||
3909 | if Is_Record_Type (T) or else Is_Private_Type (T) then | |
d469eabe HK |
3910 | |
3911 | -- If the prefix is a class-wide type, the visible components are | |
3912 | -- those of the base type. | |
3913 | ||
3914 | if Is_Class_Wide_Type (T) then | |
3915 | T := Etype (T); | |
3916 | end if; | |
3917 | ||
996ae0b0 | 3918 | Comp := First_Entity (T); |
996ae0b0 | 3919 | while Present (Comp) loop |
996ae0b0 | 3920 | if Chars (Comp) = Chars (Sel) |
24e95966 | 3921 | and then Is_Visible_Component (Comp, Sel) |
996ae0b0 | 3922 | then |
996ae0b0 | 3923 | |
f16d05d9 AC |
3924 | -- AI05-105: if the context is an object renaming with |
3925 | -- an anonymous access type, the expected type of the | |
3926 | -- object must be anonymous. This is a name resolution rule. | |
996ae0b0 | 3927 | |
f16d05d9 AC |
3928 | if Nkind (Parent (N)) /= N_Object_Renaming_Declaration |
3929 | or else No (Access_Definition (Parent (N))) | |
3930 | or else Ekind (Etype (Comp)) = E_Anonymous_Access_Type | |
3931 | or else | |
3932 | Ekind (Etype (Comp)) = E_Anonymous_Access_Subprogram_Type | |
3933 | then | |
3934 | Set_Entity (Sel, Comp); | |
3935 | Set_Etype (Sel, Etype (Comp)); | |
3936 | Add_One_Interp (N, Etype (Comp), Etype (Comp)); | |
44a10091 | 3937 | Check_Implicit_Dereference (N, Etype (Comp)); |
f16d05d9 AC |
3938 | |
3939 | -- This also specifies a candidate to resolve the name. | |
3940 | -- Further overloading will be resolved from context. | |
3941 | -- The selector name itself does not carry overloading | |
3942 | -- information. | |
3943 | ||
3944 | Set_Etype (Nam, It.Typ); | |
3945 | ||
3946 | else | |
b61ee1aa | 3947 | -- Named access type in the context of a renaming |
f16d05d9 AC |
3948 | -- declaration with an access definition. Remove |
3949 | -- inapplicable candidate. | |
3950 | ||
3951 | Remove_Interp (I); | |
3952 | end if; | |
996ae0b0 RK |
3953 | end if; |
3954 | ||
3955 | Next_Entity (Comp); | |
3956 | end loop; | |
3957 | ||
3958 | elsif Is_Concurrent_Type (T) then | |
3959 | Comp := First_Entity (T); | |
996ae0b0 RK |
3960 | while Present (Comp) |
3961 | and then Comp /= First_Private_Entity (T) | |
3962 | loop | |
3963 | if Chars (Comp) = Chars (Sel) then | |
3964 | if Is_Overloadable (Comp) then | |
3965 | Add_One_Interp (Sel, Comp, Etype (Comp)); | |
3966 | else | |
e7ba564f | 3967 | Set_Entity_With_Checks (Sel, Comp); |
996ae0b0 RK |
3968 | Generate_Reference (Comp, Sel); |
3969 | end if; | |
3970 | ||
3971 | Set_Etype (Sel, Etype (Comp)); | |
3972 | Set_Etype (N, Etype (Comp)); | |
3973 | Set_Etype (Nam, It.Typ); | |
3974 | ||
09494c32 AC |
3975 | -- For access type case, introduce explicit dereference for |
3976 | -- more uniform treatment of entry calls. Do this only once | |
3977 | -- if several interpretations yield an access type. | |
996ae0b0 | 3978 | |
d469eabe HK |
3979 | if Is_Access_Type (Etype (Nam)) |
3980 | and then Nkind (Nam) /= N_Explicit_Dereference | |
3981 | then | |
996ae0b0 | 3982 | Insert_Explicit_Dereference (Nam); |
fbf5a39b | 3983 | Error_Msg_NW |
324ac540 | 3984 | (Warn_On_Dereference, "?d?implicit dereference", N); |
996ae0b0 RK |
3985 | end if; |
3986 | end if; | |
3987 | ||
3988 | Next_Entity (Comp); | |
3989 | end loop; | |
3990 | ||
3991 | Set_Is_Overloaded (N, Is_Overloaded (Sel)); | |
996ae0b0 RK |
3992 | end if; |
3993 | ||
3994 | Get_Next_Interp (I, It); | |
3995 | end loop; | |
3996 | ||
0a36105d JM |
3997 | if Etype (N) = Any_Type |
3998 | and then not Try_Object_Operation (N) | |
3999 | then | |
996ae0b0 RK |
4000 | Error_Msg_NE ("undefined selector& for overloaded prefix", N, Sel); |
4001 | Set_Entity (Sel, Any_Id); | |
4002 | Set_Etype (Sel, Any_Type); | |
4003 | end if; | |
996ae0b0 RK |
4004 | end Analyze_Overloaded_Selected_Component; |
4005 | ||
4006 | ---------------------------------- | |
4007 | -- Analyze_Qualified_Expression -- | |
4008 | ---------------------------------- | |
4009 | ||
4010 | procedure Analyze_Qualified_Expression (N : Node_Id) is | |
4011 | Mark : constant Entity_Id := Subtype_Mark (N); | |
45c8b94b ES |
4012 | Expr : constant Node_Id := Expression (N); |
4013 | I : Interp_Index; | |
4014 | It : Interp; | |
996ae0b0 RK |
4015 | T : Entity_Id; |
4016 | ||
4017 | begin | |
45c8b94b ES |
4018 | Analyze_Expression (Expr); |
4019 | ||
996ae0b0 RK |
4020 | Set_Etype (N, Any_Type); |
4021 | Find_Type (Mark); | |
4022 | T := Entity (Mark); | |
845af9e6 | 4023 | |
aa11d1dd PMR |
4024 | if Nkind_In (Enclosing_Declaration (N), N_Formal_Type_Declaration, |
4025 | N_Full_Type_Declaration, | |
4026 | N_Incomplete_Type_Declaration, | |
4027 | N_Protected_Type_Declaration, | |
4028 | N_Private_Extension_Declaration, | |
4029 | N_Private_Type_Declaration, | |
4030 | N_Subtype_Declaration, | |
4031 | N_Task_Type_Declaration) | |
845af9e6 PMR |
4032 | and then T = Defining_Identifier (Enclosing_Declaration (N)) |
4033 | then | |
4034 | Error_Msg_N ("current instance not allowed", Mark); | |
4035 | T := Any_Type; | |
4036 | end if; | |
4037 | ||
45c8b94b | 4038 | Set_Etype (N, T); |
996ae0b0 RK |
4039 | |
4040 | if T = Any_Type then | |
4041 | return; | |
4042 | end if; | |
996ae0b0 | 4043 | |
4c46b835 | 4044 | Check_Fully_Declared (T, N); |
45c8b94b ES |
4045 | |
4046 | -- If expected type is class-wide, check for exact match before | |
4047 | -- expansion, because if the expression is a dispatching call it | |
4048 | -- may be rewritten as explicit dereference with class-wide result. | |
4049 | -- If expression is overloaded, retain only interpretations that | |
4050 | -- will yield exact matches. | |
4051 | ||
4052 | if Is_Class_Wide_Type (T) then | |
4053 | if not Is_Overloaded (Expr) then | |
32794080 JM |
4054 | if Base_Type (Etype (Expr)) /= Base_Type (T) |
4055 | and then Etype (Expr) /= Raise_Type | |
4056 | then | |
45c8b94b ES |
4057 | if Nkind (Expr) = N_Aggregate then |
4058 | Error_Msg_N ("type of aggregate cannot be class-wide", Expr); | |
4059 | else | |
4060 | Wrong_Type (Expr, T); | |
4061 | end if; | |
4062 | end if; | |
4063 | ||
4064 | else | |
4065 | Get_First_Interp (Expr, I, It); | |
4066 | ||
4067 | while Present (It.Nam) loop | |
4068 | if Base_Type (It.Typ) /= Base_Type (T) then | |
4069 | Remove_Interp (I); | |
4070 | end if; | |
4071 | ||
4072 | Get_Next_Interp (I, It); | |
4073 | end loop; | |
4074 | end if; | |
4075 | end if; | |
4076 | ||
996ae0b0 RK |
4077 | Set_Etype (N, T); |
4078 | end Analyze_Qualified_Expression; | |
4079 | ||
a961aa79 AC |
4080 | ----------------------------------- |
4081 | -- Analyze_Quantified_Expression -- | |
4082 | ----------------------------------- | |
4083 | ||
4084 | procedure Analyze_Quantified_Expression (N : Node_Id) is | |
4856cc2a | 4085 | function Is_Empty_Range (Typ : Entity_Id) return Boolean; |
538dbb56 AC |
4086 | -- If the iterator is part of a quantified expression, and the range is |
4087 | -- known to be statically empty, emit a warning and replace expression | |
4856cc2a | 4088 | -- with its static value. Returns True if the replacement occurs. |
538dbb56 | 4089 | |
0812b84e AC |
4090 | function No_Else_Or_Trivial_True (If_Expr : Node_Id) return Boolean; |
4091 | -- Determine whether if expression If_Expr lacks an else part or if it | |
4092 | -- has one, it evaluates to True. | |
4093 | ||
4856cc2a ES |
4094 | -------------------- |
4095 | -- Is_Empty_Range -- | |
4096 | -------------------- | |
4097 | ||
4098 | function Is_Empty_Range (Typ : Entity_Id) return Boolean is | |
4099 | Loc : constant Source_Ptr := Sloc (N); | |
538dbb56 AC |
4100 | |
4101 | begin | |
4102 | if Is_Array_Type (Typ) | |
4856cc2a ES |
4103 | and then Compile_Time_Known_Bounds (Typ) |
4104 | and then | |
9a6dc470 RD |
4105 | (Expr_Value (Type_Low_Bound (Etype (First_Index (Typ)))) > |
4106 | Expr_Value (Type_High_Bound (Etype (First_Index (Typ))))) | |
538dbb56 | 4107 | then |
4856cc2a ES |
4108 | Preanalyze_And_Resolve (Condition (N), Standard_Boolean); |
4109 | ||
538dbb56 | 4110 | if All_Present (N) then |
4856cc2a | 4111 | Error_Msg_N |
324ac540 | 4112 | ("??quantified expression with ALL " |
4856cc2a | 4113 | & "over a null range has value True", N); |
538dbb56 AC |
4114 | Rewrite (N, New_Occurrence_Of (Standard_True, Loc)); |
4115 | ||
4116 | else | |
4856cc2a | 4117 | Error_Msg_N |
324ac540 | 4118 | ("??quantified expression with SOME " |
4856cc2a | 4119 | & "over a null range has value False", N); |
538dbb56 AC |
4120 | Rewrite (N, New_Occurrence_Of (Standard_False, Loc)); |
4121 | end if; | |
4122 | ||
4123 | Analyze (N); | |
4124 | return True; | |
4125 | ||
4126 | else | |
4127 | return False; | |
4128 | end if; | |
4129 | end Is_Empty_Range; | |
4130 | ||
0812b84e AC |
4131 | ----------------------------- |
4132 | -- No_Else_Or_Trivial_True -- | |
4133 | ----------------------------- | |
4134 | ||
4135 | function No_Else_Or_Trivial_True (If_Expr : Node_Id) return Boolean is | |
4136 | Else_Expr : constant Node_Id := | |
4137 | Next (Next (First (Expressions (If_Expr)))); | |
4138 | begin | |
4139 | return | |
4140 | No (Else_Expr) | |
4141 | or else (Compile_Time_Known_Value (Else_Expr) | |
4142 | and then Is_True (Expr_Value (Else_Expr))); | |
4143 | end No_Else_Or_Trivial_True; | |
4144 | ||
4145 | -- Local variables | |
4146 | ||
4147 | Cond : constant Node_Id := Condition (N); | |
57081559 | 4148 | Loop_Id : Entity_Id; |
0812b84e AC |
4149 | QE_Scop : Entity_Id; |
4150 | ||
4856cc2a ES |
4151 | -- Start of processing for Analyze_Quantified_Expression |
4152 | ||
a961aa79 | 4153 | begin |
ce5ba43a | 4154 | Check_SPARK_05_Restriction ("quantified expression is not allowed", N); |
1d801f21 | 4155 | |
804670f1 AC |
4156 | -- Create a scope to emulate the loop-like behavior of the quantified |
4157 | -- expression. The scope is needed to provide proper visibility of the | |
4158 | -- loop variable. | |
b3e42de5 | 4159 | |
804670f1 AC |
4160 | QE_Scop := New_Internal_Entity (E_Loop, Current_Scope, Sloc (N), 'L'); |
4161 | Set_Etype (QE_Scop, Standard_Void_Type); | |
4162 | Set_Scope (QE_Scop, Current_Scope); | |
4163 | Set_Parent (QE_Scop, N); | |
a961aa79 | 4164 | |
804670f1 | 4165 | Push_Scope (QE_Scop); |
c56a9ba4 | 4166 | |
804670f1 AC |
4167 | -- All constituents are preanalyzed and resolved to avoid untimely |
4168 | -- generation of various temporaries and types. Full analysis and | |
4169 | -- expansion is carried out when the quantified expression is | |
4170 | -- transformed into an expression with actions. | |
c56a9ba4 | 4171 | |
804670f1 AC |
4172 | if Present (Iterator_Specification (N)) then |
4173 | Preanalyze (Iterator_Specification (N)); | |
538dbb56 | 4174 | |
57081559 AC |
4175 | -- Do not proceed with the analysis when the range of iteration is |
4176 | -- empty. The appropriate error is issued by Is_Empty_Range. | |
4177 | ||
538dbb56 AC |
4178 | if Is_Entity_Name (Name (Iterator_Specification (N))) |
4179 | and then Is_Empty_Range (Etype (Name (Iterator_Specification (N)))) | |
4180 | then | |
4181 | return; | |
4182 | end if; | |
4183 | ||
57081559 | 4184 | else pragma Assert (Present (Loop_Parameter_Specification (N))); |
a736f6e6 AC |
4185 | declare |
4186 | Loop_Par : constant Node_Id := Loop_Parameter_Specification (N); | |
4187 | ||
4188 | begin | |
4189 | Preanalyze (Loop_Par); | |
4190 | ||
e4deba8e | 4191 | if Nkind (Discrete_Subtype_Definition (Loop_Par)) = N_Function_Call |
a736f6e6 AC |
4192 | and then Parent (Loop_Par) /= N |
4193 | then | |
4194 | -- The parser cannot distinguish between a loop specification | |
5b85ad7d | 4195 | -- and an iterator specification. If after preanalysis the |
a736f6e6 | 4196 | -- proper form has been recognized, rewrite the expression to |
5f0c4d67 AC |
4197 | -- reflect the right kind. This is needed for proper ASIS |
4198 | -- navigation. If expansion is enabled, the transformation is | |
4199 | -- performed when the expression is rewritten as a loop. | |
a736f6e6 | 4200 | |
a736f6e6 AC |
4201 | Set_Iterator_Specification (N, |
4202 | New_Copy_Tree (Iterator_Specification (Parent (Loop_Par)))); | |
5f0c4d67 AC |
4203 | |
4204 | Set_Defining_Identifier (Iterator_Specification (N), | |
4205 | Relocate_Node (Defining_Identifier (Loop_Par))); | |
4206 | Set_Name (Iterator_Specification (N), | |
4207 | Relocate_Node (Discrete_Subtype_Definition (Loop_Par))); | |
4208 | Set_Comes_From_Source (Iterator_Specification (N), | |
4209 | Comes_From_Source (Loop_Parameter_Specification (N))); | |
4210 | Set_Loop_Parameter_Specification (N, Empty); | |
a736f6e6 AC |
4211 | end if; |
4212 | end; | |
ce6002ec AC |
4213 | end if; |
4214 | ||
0812b84e | 4215 | Preanalyze_And_Resolve (Cond, Standard_Boolean); |
804670f1 | 4216 | |
a961aa79 AC |
4217 | End_Scope; |
4218 | Set_Etype (N, Standard_Boolean); | |
0812b84e | 4219 | |
57081559 AC |
4220 | -- Verify that the loop variable is used within the condition of the |
4221 | -- quantified expression. | |
4222 | ||
4223 | if Present (Iterator_Specification (N)) then | |
4224 | Loop_Id := Defining_Identifier (Iterator_Specification (N)); | |
4225 | else | |
4226 | Loop_Id := Defining_Identifier (Loop_Parameter_Specification (N)); | |
4227 | end if; | |
4228 | ||
4229 | if Warn_On_Suspicious_Contract | |
4230 | and then not Referenced (Loop_Id, Cond) | |
4231 | then | |
124bed29 | 4232 | -- Generating C, this check causes spurious warnings on inlined |
519e9fdf | 4233 | -- postconditions; we can safely disable it because this check |
124bed29 | 4234 | -- was previously performed when analyzing the internally built |
519e9fdf AC |
4235 | -- postconditions procedure. |
4236 | ||
4237 | if Modify_Tree_For_C and then In_Inlined_Body then | |
4238 | null; | |
4239 | else | |
4240 | Error_Msg_N ("?T?unused variable &", Loop_Id); | |
4241 | end if; | |
57081559 AC |
4242 | end if; |
4243 | ||
e19fd0bd | 4244 | -- Diagnose a possible misuse of the SOME existential quantifier. When |
d1ec4768 RD |
4245 | -- we have a quantified expression of the form: |
4246 | ||
0812b84e | 4247 | -- for some X => (if P then Q [else True]) |
d1ec4768 | 4248 | |
e19fd0bd | 4249 | -- any value for X that makes P False results in the if expression being |
50ef946c | 4250 | -- trivially True, and so also results in the quantified expression |
e19fd0bd | 4251 | -- being trivially True. |
0812b84e | 4252 | |
e19fd0bd | 4253 | if Warn_On_Suspicious_Contract |
0812b84e AC |
4254 | and then not All_Present (N) |
4255 | and then Nkind (Cond) = N_If_Expression | |
4256 | and then No_Else_Or_Trivial_True (Cond) | |
4257 | then | |
e19fd0bd | 4258 | Error_Msg_N ("?T?suspicious expression", N); |
0812b84e AC |
4259 | Error_Msg_N ("\\did you mean (for all X ='> (if P then Q))", N); |
4260 | Error_Msg_N ("\\or (for some X ='> P and then Q) instead'?", N); | |
4261 | end if; | |
a961aa79 AC |
4262 | end Analyze_Quantified_Expression; |
4263 | ||
996ae0b0 RK |
4264 | ------------------- |
4265 | -- Analyze_Range -- | |
4266 | ------------------- | |
4267 | ||
4268 | procedure Analyze_Range (N : Node_Id) is | |
4269 | L : constant Node_Id := Low_Bound (N); | |
4270 | H : constant Node_Id := High_Bound (N); | |
4271 | I1, I2 : Interp_Index; | |
4272 | It1, It2 : Interp; | |
4273 | ||
4274 | procedure Check_Common_Type (T1, T2 : Entity_Id); | |
4275 | -- Verify the compatibility of two types, and choose the | |
4276 | -- non universal one if the other is universal. | |
4277 | ||
4278 | procedure Check_High_Bound (T : Entity_Id); | |
4279 | -- Test one interpretation of the low bound against all those | |
4280 | -- of the high bound. | |
4281 | ||
fbf5a39b | 4282 | procedure Check_Universal_Expression (N : Node_Id); |
a1092b48 AC |
4283 | -- In Ada 83, reject bounds of a universal range that are not literals |
4284 | -- or entity names. | |
fbf5a39b | 4285 | |
996ae0b0 RK |
4286 | ----------------------- |
4287 | -- Check_Common_Type -- | |
4288 | ----------------------- | |
4289 | ||
4290 | procedure Check_Common_Type (T1, T2 : Entity_Id) is | |
4291 | begin | |
b4592168 GD |
4292 | if Covers (T1 => T1, T2 => T2) |
4293 | or else | |
4294 | Covers (T1 => T2, T2 => T1) | |
4295 | then | |
996ae0b0 RK |
4296 | if T1 = Universal_Integer |
4297 | or else T1 = Universal_Real | |
4298 | or else T1 = Any_Character | |
4299 | then | |
4300 | Add_One_Interp (N, Base_Type (T2), Base_Type (T2)); | |
4301 | ||
fbf5a39b | 4302 | elsif T1 = T2 then |
996ae0b0 RK |
4303 | Add_One_Interp (N, T1, T1); |
4304 | ||
4305 | else | |
4306 | Add_One_Interp (N, Base_Type (T1), Base_Type (T1)); | |
4307 | end if; | |
4308 | end if; | |
4309 | end Check_Common_Type; | |
4310 | ||
4311 | ---------------------- | |
4312 | -- Check_High_Bound -- | |
4313 | ---------------------- | |
4314 | ||
4315 | procedure Check_High_Bound (T : Entity_Id) is | |
4316 | begin | |
4317 | if not Is_Overloaded (H) then | |
4318 | Check_Common_Type (T, Etype (H)); | |
4319 | else | |
4320 | Get_First_Interp (H, I2, It2); | |
996ae0b0 RK |
4321 | while Present (It2.Typ) loop |
4322 | Check_Common_Type (T, It2.Typ); | |
4323 | Get_Next_Interp (I2, It2); | |
4324 | end loop; | |
4325 | end if; | |
4326 | end Check_High_Bound; | |
4327 | ||
8016e567 PT |
4328 | -------------------------------- |
4329 | -- Check_Universal_Expression -- | |
4330 | -------------------------------- | |
fbf5a39b AC |
4331 | |
4332 | procedure Check_Universal_Expression (N : Node_Id) is | |
4333 | begin | |
4334 | if Etype (N) = Universal_Integer | |
4335 | and then Nkind (N) /= N_Integer_Literal | |
4336 | and then not Is_Entity_Name (N) | |
4337 | and then Nkind (N) /= N_Attribute_Reference | |
4338 | then | |
4339 | Error_Msg_N ("illegal bound in discrete range", N); | |
4340 | end if; | |
4341 | end Check_Universal_Expression; | |
4342 | ||
996ae0b0 RK |
4343 | -- Start of processing for Analyze_Range |
4344 | ||
4345 | begin | |
4346 | Set_Etype (N, Any_Type); | |
4347 | Analyze_Expression (L); | |
4348 | Analyze_Expression (H); | |
4349 | ||
4350 | if Etype (L) = Any_Type or else Etype (H) = Any_Type then | |
4351 | return; | |
4352 | ||
4353 | else | |
4354 | if not Is_Overloaded (L) then | |
4355 | Check_High_Bound (Etype (L)); | |
4356 | else | |
4357 | Get_First_Interp (L, I1, It1); | |
996ae0b0 RK |
4358 | while Present (It1.Typ) loop |
4359 | Check_High_Bound (It1.Typ); | |
4360 | Get_Next_Interp (I1, It1); | |
4361 | end loop; | |
4362 | end if; | |
4363 | ||
4364 | -- If result is Any_Type, then we did not find a compatible pair | |
4365 | ||
4366 | if Etype (N) = Any_Type then | |
4367 | Error_Msg_N ("incompatible types in range ", N); | |
4368 | end if; | |
4369 | end if; | |
fbf5a39b | 4370 | |
0ab80019 | 4371 | if Ada_Version = Ada_83 |
fbf5a39b AC |
4372 | and then |
4373 | (Nkind (Parent (N)) = N_Loop_Parameter_Specification | |
4c46b835 | 4374 | or else Nkind (Parent (N)) = N_Constrained_Array_Definition) |
fbf5a39b AC |
4375 | then |
4376 | Check_Universal_Expression (L); | |
4377 | Check_Universal_Expression (H); | |
4378 | end if; | |
d3820795 | 4379 | |
22e89283 | 4380 | Check_Function_Writable_Actuals (N); |
996ae0b0 RK |
4381 | end Analyze_Range; |
4382 | ||
4383 | ----------------------- | |
4384 | -- Analyze_Reference -- | |
4385 | ----------------------- | |
4386 | ||
4387 | procedure Analyze_Reference (N : Node_Id) is | |
4388 | P : constant Node_Id := Prefix (N); | |
b4592168 GD |
4389 | E : Entity_Id; |
4390 | T : Entity_Id; | |
996ae0b0 | 4391 | Acc_Type : Entity_Id; |
b4592168 | 4392 | |
996ae0b0 RK |
4393 | begin |
4394 | Analyze (P); | |
b4592168 | 4395 | |
c42e1b17 AC |
4396 | -- An interesting error check, if we take the 'Ref of an object for |
4397 | -- which a pragma Atomic or Volatile has been given, and the type of the | |
4398 | -- object is not Atomic or Volatile, then we are in trouble. The problem | |
4399 | -- is that no trace of the atomic/volatile status will remain for the | |
4400 | -- backend to respect when it deals with the resulting pointer, since | |
4401 | -- the pointer type will not be marked atomic (it is a pointer to the | |
4402 | -- base type of the object). | |
b4592168 GD |
4403 | |
4404 | -- It is not clear if that can ever occur, but in case it does, we will | |
4405 | -- generate an error message. Not clear if this message can ever be | |
4406 | -- generated, and pretty clear that it represents a bug if it is, still | |
d2f25cd1 AC |
4407 | -- seems worth checking, except in CodePeer mode where we do not really |
4408 | -- care and don't want to bother the user. | |
b4592168 GD |
4409 | |
4410 | T := Etype (P); | |
4411 | ||
4412 | if Is_Entity_Name (P) | |
4413 | and then Is_Object_Reference (P) | |
d2f25cd1 | 4414 | and then not CodePeer_Mode |
b4592168 GD |
4415 | then |
4416 | E := Entity (P); | |
4417 | T := Etype (P); | |
4418 | ||
4419 | if (Has_Atomic_Components (E) | |
c42e1b17 | 4420 | and then not Has_Atomic_Components (T)) |
b4592168 GD |
4421 | or else |
4422 | (Has_Volatile_Components (E) | |
c42e1b17 | 4423 | and then not Has_Volatile_Components (T)) |
b4592168 GD |
4424 | or else (Is_Atomic (E) and then not Is_Atomic (T)) |
4425 | or else (Is_Volatile (E) and then not Is_Volatile (T)) | |
4426 | then | |
4427 | Error_Msg_N ("cannot take reference to Atomic/Volatile object", N); | |
4428 | end if; | |
4429 | end if; | |
4430 | ||
4431 | -- Carry on with normal processing | |
4432 | ||
996ae0b0 | 4433 | Acc_Type := Create_Itype (E_Allocator_Type, N); |
b4592168 | 4434 | Set_Etype (Acc_Type, Acc_Type); |
996ae0b0 RK |
4435 | Set_Directly_Designated_Type (Acc_Type, Etype (P)); |
4436 | Set_Etype (N, Acc_Type); | |
4437 | end Analyze_Reference; | |
4438 | ||
4439 | -------------------------------- | |
4440 | -- Analyze_Selected_Component -- | |
4441 | -------------------------------- | |
4442 | ||
2383acbd AC |
4443 | -- Prefix is a record type or a task or protected type. In the latter case, |
4444 | -- the selector must denote a visible entry. | |
996ae0b0 RK |
4445 | |
4446 | procedure Analyze_Selected_Component (N : Node_Id) is | |
d469eabe HK |
4447 | Name : constant Node_Id := Prefix (N); |
4448 | Sel : constant Node_Id := Selector_Name (N); | |
4449 | Act_Decl : Node_Id; | |
4450 | Comp : Entity_Id; | |
4451 | Has_Candidate : Boolean := False; | |
c0e938d0 | 4452 | Hidden_Comp : Entity_Id; |
d469eabe | 4453 | In_Scope : Boolean; |
d1eb8a82 | 4454 | Is_Private_Op : Boolean; |
d469eabe HK |
4455 | Parent_N : Node_Id; |
4456 | Pent : Entity_Id := Empty; | |
4457 | Prefix_Type : Entity_Id; | |
401093c1 ES |
4458 | |
4459 | Type_To_Use : Entity_Id; | |
4460 | -- In most cases this is the Prefix_Type, but if the Prefix_Type is | |
4461 | -- a class-wide type, we use its root type, whose components are | |
4462 | -- present in the class-wide type. | |
4463 | ||
2383acbd AC |
4464 | Is_Single_Concurrent_Object : Boolean; |
4465 | -- Set True if the prefix is a single task or a single protected object | |
4466 | ||
20261dc1 AC |
4467 | procedure Find_Component_In_Instance (Rec : Entity_Id); |
4468 | -- In an instance, a component of a private extension may not be visible | |
4469 | -- while it was visible in the generic. Search candidate scope for a | |
4470 | -- component with the proper identifier. This is only done if all other | |
f90d14ac AC |
4471 | -- searches have failed. If a match is found, the Etype of both N and |
4472 | -- Sel are set from this component, and the entity of Sel is set to | |
4473 | -- reference this component. If no match is found, Entity (Sel) remains | |
7d9880c9 AC |
4474 | -- unset. For a derived type that is an actual of the instance, the |
4475 | -- desired component may be found in any ancestor. | |
20261dc1 | 4476 | |
d469eabe HK |
4477 | function Has_Mode_Conformant_Spec (Comp : Entity_Id) return Boolean; |
4478 | -- It is known that the parent of N denotes a subprogram call. Comp | |
4479 | -- is an overloadable component of the concurrent type of the prefix. | |
4480 | -- Determine whether all formals of the parent of N and Comp are mode | |
b4592168 GD |
4481 | -- conformant. If the parent node is not analyzed yet it may be an |
4482 | -- indexed component rather than a function call. | |
d469eabe | 4483 | |
bd717ec9 | 4484 | function Has_Dereference (Nod : Node_Id) return Boolean; |
0f8b3e5d | 4485 | -- Check whether prefix includes a dereference at any level. |
bd717ec9 | 4486 | |
20261dc1 AC |
4487 | -------------------------------- |
4488 | -- Find_Component_In_Instance -- | |
4489 | -------------------------------- | |
4490 | ||
4491 | procedure Find_Component_In_Instance (Rec : Entity_Id) is | |
4492 | Comp : Entity_Id; | |
7d9880c9 | 4493 | Typ : Entity_Id; |
20261dc1 AC |
4494 | |
4495 | begin | |
7d9880c9 AC |
4496 | Typ := Rec; |
4497 | while Present (Typ) loop | |
4498 | Comp := First_Component (Typ); | |
4499 | while Present (Comp) loop | |
4500 | if Chars (Comp) = Chars (Sel) then | |
4501 | Set_Entity_With_Checks (Sel, Comp); | |
4502 | Set_Etype (Sel, Etype (Comp)); | |
4503 | Set_Etype (N, Etype (Comp)); | |
4504 | return; | |
4505 | end if; | |
4506 | ||
4507 | Next_Component (Comp); | |
4508 | end loop; | |
4509 | ||
4510 | -- If not found, the component may be declared in the parent | |
4511 | -- type or its full view, if any. | |
4512 | ||
4513 | if Is_Derived_Type (Typ) then | |
4514 | Typ := Etype (Typ); | |
4515 | ||
4516 | if Is_Private_Type (Typ) then | |
4517 | Typ := Full_View (Typ); | |
4518 | end if; | |
4519 | ||
4520 | else | |
20261dc1 AC |
4521 | return; |
4522 | end if; | |
20261dc1 AC |
4523 | end loop; |
4524 | ||
cf3e6845 AC |
4525 | -- If we fall through, no match, so no changes made |
4526 | ||
4527 | return; | |
20261dc1 AC |
4528 | end Find_Component_In_Instance; |
4529 | ||
d469eabe HK |
4530 | ------------------------------ |
4531 | -- Has_Mode_Conformant_Spec -- | |
4532 | ------------------------------ | |
4533 | ||
4534 | function Has_Mode_Conformant_Spec (Comp : Entity_Id) return Boolean is | |
4535 | Comp_Param : Entity_Id; | |
4536 | Param : Node_Id; | |
4537 | Param_Typ : Entity_Id; | |
4538 | ||
4539 | begin | |
4540 | Comp_Param := First_Formal (Comp); | |
b4592168 GD |
4541 | |
4542 | if Nkind (Parent (N)) = N_Indexed_Component then | |
4543 | Param := First (Expressions (Parent (N))); | |
4544 | else | |
4545 | Param := First (Parameter_Associations (Parent (N))); | |
4546 | end if; | |
4547 | ||
d469eabe HK |
4548 | while Present (Comp_Param) |
4549 | and then Present (Param) | |
4550 | loop | |
4551 | Param_Typ := Find_Parameter_Type (Param); | |
4552 | ||
4553 | if Present (Param_Typ) | |
4554 | and then | |
4555 | not Conforming_Types | |
4556 | (Etype (Comp_Param), Param_Typ, Mode_Conformant) | |
4557 | then | |
4558 | return False; | |
4559 | end if; | |
4560 | ||
4561 | Next_Formal (Comp_Param); | |
4562 | Next (Param); | |
4563 | end loop; | |
4564 | ||
9e92ad49 AC |
4565 | -- One of the specs has additional formals; there is no match, unless |
4566 | -- this may be an indexing of a parameterless call. | |
f0e7963f AC |
4567 | |
4568 | -- Note that when expansion is disabled, the corresponding record | |
4569 | -- type of synchronized types is not constructed, so that there is | |
4570 | -- no point is attempting an interpretation as a prefixed call, as | |
4571 | -- this is bound to fail because the primitive operations will not | |
4572 | -- be properly located. | |
d469eabe HK |
4573 | |
4574 | if Present (Comp_Param) or else Present (Param) then | |
f0e7963f AC |
4575 | if Needs_No_Actuals (Comp) |
4576 | and then Is_Array_Type (Etype (Comp)) | |
4577 | and then not Expander_Active | |
4578 | then | |
4579 | return True; | |
f0e7963f AC |
4580 | else |
4581 | return False; | |
4582 | end if; | |
d469eabe HK |
4583 | end if; |
4584 | ||
4585 | return True; | |
4586 | end Has_Mode_Conformant_Spec; | |
996ae0b0 | 4587 | |
bd717ec9 AC |
4588 | --------------------- |
4589 | -- Has_Dereference -- | |
4590 | --------------------- | |
4591 | ||
4592 | function Has_Dereference (Nod : Node_Id) return Boolean is | |
4593 | begin | |
4594 | if Nkind (Nod) = N_Explicit_Dereference then | |
4595 | return True; | |
4596 | ||
a6363ed3 AC |
4597 | -- When expansion is disabled an explicit dereference may not have |
4598 | -- been inserted, but if this is an access type the indirection makes | |
4599 | -- the call safe. | |
4600 | ||
4601 | elsif Is_Access_Type (Etype (Nod)) then | |
4602 | return True; | |
4603 | ||
bd717ec9 AC |
4604 | elsif Nkind_In (Nod, N_Indexed_Component, N_Selected_Component) then |
4605 | return Has_Dereference (Prefix (Nod)); | |
4606 | ||
4607 | else | |
4608 | return False; | |
4609 | end if; | |
4610 | end Has_Dereference; | |
4611 | ||
996ae0b0 RK |
4612 | -- Start of processing for Analyze_Selected_Component |
4613 | ||
4614 | begin | |
4615 | Set_Etype (N, Any_Type); | |
4616 | ||
4617 | if Is_Overloaded (Name) then | |
4618 | Analyze_Overloaded_Selected_Component (N); | |
4619 | return; | |
4620 | ||
4621 | elsif Etype (Name) = Any_Type then | |
4622 | Set_Entity (Sel, Any_Id); | |
4623 | Set_Etype (Sel, Any_Type); | |
4624 | return; | |
4625 | ||
4626 | else | |
996ae0b0 RK |
4627 | Prefix_Type := Etype (Name); |
4628 | end if; | |
4629 | ||
4630 | if Is_Access_Type (Prefix_Type) then | |
07fc65c4 | 4631 | |
0d57c6f4 RD |
4632 | -- A RACW object can never be used as prefix of a selected component |
4633 | -- since that means it is dereferenced without being a controlling | |
4634 | -- operand of a dispatching operation (RM E.2.2(16/1)). Before | |
4635 | -- reporting an error, we must check whether this is actually a | |
4636 | -- dispatching call in prefix form. | |
07fc65c4 | 4637 | |
996ae0b0 RK |
4638 | if Is_Remote_Access_To_Class_Wide_Type (Prefix_Type) |
4639 | and then Comes_From_Source (N) | |
4640 | then | |
b4592168 GD |
4641 | if Try_Object_Operation (N) then |
4642 | return; | |
4643 | else | |
4644 | Error_Msg_N | |
4645 | ("invalid dereference of a remote access-to-class-wide value", | |
4646 | N); | |
4647 | end if; | |
07fc65c4 GB |
4648 | |
4649 | -- Normal case of selected component applied to access type | |
4650 | ||
4651 | else | |
324ac540 | 4652 | Error_Msg_NW (Warn_On_Dereference, "?d?implicit dereference", N); |
da709d08 | 4653 | |
6e73e3ab AC |
4654 | if Is_Entity_Name (Name) then |
4655 | Pent := Entity (Name); | |
4656 | elsif Nkind (Name) = N_Selected_Component | |
4657 | and then Is_Entity_Name (Selector_Name (Name)) | |
4658 | then | |
4659 | Pent := Entity (Selector_Name (Name)); | |
4660 | end if; | |
da709d08 | 4661 | |
d469eabe | 4662 | Prefix_Type := Process_Implicit_Dereference_Prefix (Pent, Name); |
996ae0b0 | 4663 | end if; |
b4592168 GD |
4664 | |
4665 | -- If we have an explicit dereference of a remote access-to-class-wide | |
4666 | -- value, then issue an error (see RM-E.2.2(16/1)). However we first | |
4667 | -- have to check for the case of a prefix that is a controlling operand | |
4668 | -- of a prefixed dispatching call, as the dereference is legal in that | |
4669 | -- case. Normally this condition is checked in Validate_Remote_Access_ | |
4670 | -- To_Class_Wide_Type, but we have to defer the checking for selected | |
4671 | -- component prefixes because of the prefixed dispatching call case. | |
4672 | -- Note that implicit dereferences are checked for this just above. | |
4673 | ||
4674 | elsif Nkind (Name) = N_Explicit_Dereference | |
4675 | and then Is_Remote_Access_To_Class_Wide_Type (Etype (Prefix (Name))) | |
4676 | and then Comes_From_Source (N) | |
4677 | then | |
4678 | if Try_Object_Operation (N) then | |
4679 | return; | |
4680 | else | |
4681 | Error_Msg_N | |
4682 | ("invalid dereference of a remote access-to-class-wide value", | |
4683 | N); | |
4684 | end if; | |
aab883ec | 4685 | end if; |
b67a385c | 4686 | |
aab883ec ES |
4687 | -- (Ada 2005): if the prefix is the limited view of a type, and |
4688 | -- the context already includes the full view, use the full view | |
4689 | -- in what follows, either to retrieve a component of to find | |
4690 | -- a primitive operation. If the prefix is an explicit dereference, | |
4691 | -- set the type of the prefix to reflect this transformation. | |
a316b3fc | 4692 | -- If the nonlimited view is itself an incomplete type, get the |
401093c1 | 4693 | -- full view if available. |
aab883ec | 4694 | |
47346923 AC |
4695 | if From_Limited_With (Prefix_Type) |
4696 | and then Has_Non_Limited_View (Prefix_Type) | |
aab883ec | 4697 | then |
401093c1 | 4698 | Prefix_Type := Get_Full_View (Non_Limited_View (Prefix_Type)); |
aab883ec ES |
4699 | |
4700 | if Nkind (N) = N_Explicit_Dereference then | |
4701 | Set_Etype (Prefix (N), Prefix_Type); | |
4702 | end if; | |
996ae0b0 RK |
4703 | end if; |
4704 | ||
4705 | if Ekind (Prefix_Type) = E_Private_Subtype then | |
4706 | Prefix_Type := Base_Type (Prefix_Type); | |
4707 | end if; | |
4708 | ||
401093c1 | 4709 | Type_To_Use := Prefix_Type; |
996ae0b0 RK |
4710 | |
4711 | -- For class-wide types, use the entity list of the root type. This | |
4712 | -- indirection is specially important for private extensions because | |
4713 | -- only the root type get switched (not the class-wide type). | |
4714 | ||
4715 | if Is_Class_Wide_Type (Prefix_Type) then | |
401093c1 | 4716 | Type_To_Use := Root_Type (Prefix_Type); |
996ae0b0 RK |
4717 | end if; |
4718 | ||
2383acbd AC |
4719 | -- If the prefix is a single concurrent object, use its name in error |
4720 | -- messages, rather than that of its anonymous type. | |
4721 | ||
4722 | Is_Single_Concurrent_Object := | |
4723 | Is_Concurrent_Type (Prefix_Type) | |
4724 | and then Is_Internal_Name (Chars (Prefix_Type)) | |
4725 | and then not Is_Derived_Type (Prefix_Type) | |
4726 | and then Is_Entity_Name (Name); | |
4727 | ||
401093c1 | 4728 | Comp := First_Entity (Type_To_Use); |
996ae0b0 RK |
4729 | |
4730 | -- If the selector has an original discriminant, the node appears in | |
4731 | -- an instance. Replace the discriminant with the corresponding one | |
4732 | -- in the current discriminated type. For nested generics, this must | |
4733 | -- be done transitively, so note the new original discriminant. | |
4734 | ||
4735 | if Nkind (Sel) = N_Identifier | |
c0b11850 | 4736 | and then In_Instance |
996ae0b0 RK |
4737 | and then Present (Original_Discriminant (Sel)) |
4738 | then | |
4739 | Comp := Find_Corresponding_Discriminant (Sel, Prefix_Type); | |
4740 | ||
4741 | -- Mark entity before rewriting, for completeness and because | |
4742 | -- subsequent semantic checks might examine the original node. | |
4743 | ||
4744 | Set_Entity (Sel, Comp); | |
ee2ba856 | 4745 | Rewrite (Selector_Name (N), New_Occurrence_Of (Comp, Sloc (N))); |
996ae0b0 RK |
4746 | Set_Original_Discriminant (Selector_Name (N), Comp); |
4747 | Set_Etype (N, Etype (Comp)); | |
44a10091 | 4748 | Check_Implicit_Dereference (N, Etype (Comp)); |
996ae0b0 RK |
4749 | |
4750 | if Is_Access_Type (Etype (Name)) then | |
4751 | Insert_Explicit_Dereference (Name); | |
324ac540 | 4752 | Error_Msg_NW (Warn_On_Dereference, "?d?implicit dereference", N); |
996ae0b0 RK |
4753 | end if; |
4754 | ||
4755 | elsif Is_Record_Type (Prefix_Type) then | |
4756 | ||
ee2ba856 AC |
4757 | -- Find component with given name. In an instance, if the node is |
4758 | -- known as a prefixed call, do not examine components whose | |
4759 | -- visibility may be accidental. | |
996ae0b0 | 4760 | |
4913e24c | 4761 | while Present (Comp) and then not Is_Prefixed_Call (N) loop |
996ae0b0 | 4762 | if Chars (Comp) = Chars (Sel) |
a53c5613 | 4763 | and then Is_Visible_Component (Comp, N) |
996ae0b0 | 4764 | then |
e7ba564f | 4765 | Set_Entity_With_Checks (Sel, Comp); |
996ae0b0 RK |
4766 | Set_Etype (Sel, Etype (Comp)); |
4767 | ||
4768 | if Ekind (Comp) = E_Discriminant then | |
5d09245e | 4769 | if Is_Unchecked_Union (Base_Type (Prefix_Type)) then |
996ae0b0 | 4770 | Error_Msg_N |
02f58834 | 4771 | ("cannot reference discriminant of unchecked union", |
996ae0b0 RK |
4772 | Sel); |
4773 | end if; | |
4774 | ||
4775 | if Is_Generic_Type (Prefix_Type) | |
4776 | or else | |
4777 | Is_Generic_Type (Root_Type (Prefix_Type)) | |
4778 | then | |
4779 | Set_Original_Discriminant (Sel, Comp); | |
4780 | end if; | |
4781 | end if; | |
4782 | ||
4783 | -- Resolve the prefix early otherwise it is not possible to | |
4784 | -- build the actual subtype of the component: it may need | |
4785 | -- to duplicate this prefix and duplication is only allowed | |
4786 | -- on fully resolved expressions. | |
4787 | ||
fbf5a39b | 4788 | Resolve (Name); |
996ae0b0 | 4789 | |
b67a385c ES |
4790 | -- Ada 2005 (AI-50217): Check wrong use of incomplete types or |
4791 | -- subtypes in a package specification. | |
28be29ce ES |
4792 | -- Example: |
4793 | ||
4794 | -- limited with Pkg; | |
4795 | -- package Pkg is | |
4796 | -- type Acc_Inc is access Pkg.T; | |
4797 | -- X : Acc_Inc; | |
b67a385c ES |
4798 | -- N : Natural := X.all.Comp; -- ERROR, limited view |
4799 | -- end Pkg; -- Comp is not visible | |
28be29ce ES |
4800 | |
4801 | if Nkind (Name) = N_Explicit_Dereference | |
7b56a91b | 4802 | and then From_Limited_With (Etype (Prefix (Name))) |
28be29ce | 4803 | and then not Is_Potentially_Use_Visible (Etype (Name)) |
b67a385c ES |
4804 | and then Nkind (Parent (Cunit_Entity (Current_Sem_Unit))) = |
4805 | N_Package_Specification | |
28be29ce ES |
4806 | then |
4807 | Error_Msg_NE | |
4808 | ("premature usage of incomplete}", Prefix (Name), | |
4809 | Etype (Prefix (Name))); | |
4810 | end if; | |
4811 | ||
996ae0b0 RK |
4812 | -- We never need an actual subtype for the case of a selection |
4813 | -- for a indexed component of a non-packed array, since in | |
4814 | -- this case gigi generates all the checks and can find the | |
4815 | -- necessary bounds information. | |
4816 | ||
0d57c6f4 RD |
4817 | -- We also do not need an actual subtype for the case of a |
4818 | -- first, last, length, or range attribute applied to a | |
996ae0b0 RK |
4819 | -- non-packed array, since gigi can again get the bounds in |
4820 | -- these cases (gigi cannot handle the packed case, since it | |
4821 | -- has the bounds of the packed array type, not the original | |
4822 | -- bounds of the type). However, if the prefix is itself a | |
4823 | -- selected component, as in a.b.c (i), gigi may regard a.b.c | |
4824 | -- as a dynamic-sized temporary, so we do generate an actual | |
4825 | -- subtype for this case. | |
4826 | ||
4827 | Parent_N := Parent (N); | |
4828 | ||
4829 | if not Is_Packed (Etype (Comp)) | |
4830 | and then | |
4831 | ((Nkind (Parent_N) = N_Indexed_Component | |
d469eabe | 4832 | and then Nkind (Name) /= N_Selected_Component) |
996ae0b0 RK |
4833 | or else |
4834 | (Nkind (Parent_N) = N_Attribute_Reference | |
b69cd36a AC |
4835 | and then |
4836 | Nam_In (Attribute_Name (Parent_N), Name_First, | |
4837 | Name_Last, | |
4838 | Name_Length, | |
4839 | Name_Range))) | |
996ae0b0 RK |
4840 | then |
4841 | Set_Etype (N, Etype (Comp)); | |
4842 | ||
98123480 ES |
4843 | -- If full analysis is not enabled, we do not generate an |
4844 | -- actual subtype, because in the absence of expansion | |
4845 | -- reference to a formal of a protected type, for example, | |
4846 | -- will not be properly transformed, and will lead to | |
4847 | -- out-of-scope references in gigi. | |
4848 | ||
4849 | -- In all other cases, we currently build an actual subtype. | |
4850 | -- It seems likely that many of these cases can be avoided, | |
4851 | -- but right now, the front end makes direct references to the | |
fbf5a39b | 4852 | -- bounds (e.g. in generating a length check), and if we do |
996ae0b0 | 4853 | -- not make an actual subtype, we end up getting a direct |
98123480 | 4854 | -- reference to a discriminant, which will not do. |
996ae0b0 | 4855 | |
98123480 | 4856 | elsif Full_Analysis then |
996ae0b0 RK |
4857 | Act_Decl := |
4858 | Build_Actual_Subtype_Of_Component (Etype (Comp), N); | |
4859 | Insert_Action (N, Act_Decl); | |
4860 | ||
4861 | if No (Act_Decl) then | |
4862 | Set_Etype (N, Etype (Comp)); | |
4863 | ||
4864 | else | |
605d8166 ES |
4865 | -- If discriminants were present in the component |
4866 | -- declaration, they have been replaced by the | |
4867 | -- actual values in the prefix object. | |
996ae0b0 RK |
4868 | |
4869 | declare | |
fbf5a39b AC |
4870 | Subt : constant Entity_Id := |
4871 | Defining_Identifier (Act_Decl); | |
996ae0b0 RK |
4872 | begin |
4873 | Set_Etype (Subt, Base_Type (Etype (Comp))); | |
996ae0b0 RK |
4874 | Set_Etype (N, Subt); |
4875 | end; | |
4876 | end if; | |
98123480 ES |
4877 | |
4878 | -- If Full_Analysis not enabled, just set the Etype | |
4879 | ||
4880 | else | |
4881 | Set_Etype (N, Etype (Comp)); | |
996ae0b0 RK |
4882 | end if; |
4883 | ||
44a10091 | 4884 | Check_Implicit_Dereference (N, Etype (N)); |
996ae0b0 RK |
4885 | return; |
4886 | end if; | |
4887 | ||
aab883ec | 4888 | -- If the prefix is a private extension, check only the visible |
9c510803 | 4889 | -- components of the partial view. This must include the tag, |
f3d57416 | 4890 | -- which can appear in expanded code in a tag check. |
aab883ec | 4891 | |
9c510803 | 4892 | if Ekind (Type_To_Use) = E_Record_Type_With_Private |
df3e68b1 | 4893 | and then Chars (Selector_Name (N)) /= Name_uTag |
9c510803 | 4894 | then |
401093c1 | 4895 | exit when Comp = Last_Entity (Type_To_Use); |
aab883ec ES |
4896 | end if; |
4897 | ||
996ae0b0 RK |
4898 | Next_Entity (Comp); |
4899 | end loop; | |
4900 | ||
d469eabe HK |
4901 | -- Ada 2005 (AI-252): The selected component can be interpreted as |
4902 | -- a prefixed view of a subprogram. Depending on the context, this is | |
4903 | -- either a name that can appear in a renaming declaration, or part | |
4904 | -- of an enclosing call given in prefix form. | |
4905 | ||
4906 | -- Ada 2005 (AI05-0030): In the case of dispatching requeue, the | |
4907 | -- selected component should resolve to a name. | |
35ae2ed8 | 4908 | |
0791fbe9 | 4909 | if Ada_Version >= Ada_2005 |
35ae2ed8 | 4910 | and then Is_Tagged_Type (Prefix_Type) |
d469eabe | 4911 | and then not Is_Concurrent_Type (Prefix_Type) |
35ae2ed8 | 4912 | then |
d469eabe HK |
4913 | if Nkind (Parent (N)) = N_Generic_Association |
4914 | or else Nkind (Parent (N)) = N_Requeue_Statement | |
4915 | or else Nkind (Parent (N)) = N_Subprogram_Renaming_Declaration | |
4916 | then | |
4917 | if Find_Primitive_Operation (N) then | |
4918 | return; | |
4919 | end if; | |
4920 | ||
4921 | elsif Try_Object_Operation (N) then | |
4922 | return; | |
4923 | end if; | |
4c46b835 | 4924 | |
98123480 ES |
4925 | -- If the transformation fails, it will be necessary to redo the |
4926 | -- analysis with all errors enabled, to indicate candidate | |
4927 | -- interpretations and reasons for each failure ??? | |
4c46b835 | 4928 | |
35ae2ed8 AC |
4929 | end if; |
4930 | ||
996ae0b0 | 4931 | elsif Is_Private_Type (Prefix_Type) then |
d469eabe | 4932 | |
98123480 ES |
4933 | -- Allow access only to discriminants of the type. If the type has |
4934 | -- no full view, gigi uses the parent type for the components, so we | |
4935 | -- do the same here. | |
996ae0b0 RK |
4936 | |
4937 | if No (Full_View (Prefix_Type)) then | |
401093c1 ES |
4938 | Type_To_Use := Root_Type (Base_Type (Prefix_Type)); |
4939 | Comp := First_Entity (Type_To_Use); | |
996ae0b0 RK |
4940 | end if; |
4941 | ||
4942 | while Present (Comp) loop | |
996ae0b0 RK |
4943 | if Chars (Comp) = Chars (Sel) then |
4944 | if Ekind (Comp) = E_Discriminant then | |
e7ba564f | 4945 | Set_Entity_With_Checks (Sel, Comp); |
996ae0b0 RK |
4946 | Generate_Reference (Comp, Sel); |
4947 | ||
4948 | Set_Etype (Sel, Etype (Comp)); | |
4949 | Set_Etype (N, Etype (Comp)); | |
44a10091 | 4950 | Check_Implicit_Dereference (N, Etype (N)); |
996ae0b0 RK |
4951 | |
4952 | if Is_Generic_Type (Prefix_Type) | |
d469eabe | 4953 | or else Is_Generic_Type (Root_Type (Prefix_Type)) |
996ae0b0 RK |
4954 | then |
4955 | Set_Original_Discriminant (Sel, Comp); | |
4956 | end if; | |
4957 | ||
f3d57416 | 4958 | -- Before declaring an error, check whether this is tagged |
aab883ec ES |
4959 | -- private type and a call to a primitive operation. |
4960 | ||
0791fbe9 | 4961 | elsif Ada_Version >= Ada_2005 |
aab883ec ES |
4962 | and then Is_Tagged_Type (Prefix_Type) |
4963 | and then Try_Object_Operation (N) | |
4964 | then | |
4965 | return; | |
4966 | ||
996ae0b0 | 4967 | else |
2383acbd AC |
4968 | Error_Msg_Node_2 := First_Subtype (Prefix_Type); |
4969 | Error_Msg_NE ("invisible selector& for }", N, Sel); | |
996ae0b0 RK |
4970 | Set_Entity (Sel, Any_Id); |
4971 | Set_Etype (N, Any_Type); | |
4972 | end if; | |
4973 | ||
4974 | return; | |
4975 | end if; | |
4976 | ||
4977 | Next_Entity (Comp); | |
4978 | end loop; | |
4979 | ||
4980 | elsif Is_Concurrent_Type (Prefix_Type) then | |
4981 | ||
d469eabe HK |
4982 | -- Find visible operation with given name. For a protected type, |
4983 | -- the possible candidates are discriminants, entries or protected | |
d1eb8a82 | 4984 | -- subprograms. For a task type, the set can only include entries or |
d469eabe HK |
4985 | -- discriminants if the task type is not an enclosing scope. If it |
4986 | -- is an enclosing scope (e.g. in an inner task) then all entities | |
4987 | -- are visible, but the prefix must denote the enclosing scope, i.e. | |
4988 | -- can only be a direct name or an expanded name. | |
996ae0b0 | 4989 | |
d469eabe | 4990 | Set_Etype (Sel, Any_Type); |
c0e938d0 | 4991 | Hidden_Comp := Empty; |
996ae0b0 | 4992 | In_Scope := In_Open_Scopes (Prefix_Type); |
d1eb8a82 | 4993 | Is_Private_Op := False; |
996ae0b0 RK |
4994 | |
4995 | while Present (Comp) loop | |
f31dcd99 | 4996 | |
86ec3bfb AC |
4997 | -- Do not examine private operations of the type if not within |
4998 | -- its scope. | |
4999 | ||
996ae0b0 | 5000 | if Chars (Comp) = Chars (Sel) then |
86ec3bfb AC |
5001 | if Is_Overloadable (Comp) |
5002 | and then (In_Scope | |
5003 | or else Comp /= First_Private_Entity (Type_To_Use)) | |
5004 | then | |
996ae0b0 | 5005 | Add_One_Interp (Sel, Comp, Etype (Comp)); |
d1eb8a82 AC |
5006 | if Comp = First_Private_Entity (Type_To_Use) then |
5007 | Is_Private_Op := True; | |
5008 | end if; | |
996ae0b0 | 5009 | |
d469eabe HK |
5010 | -- If the prefix is tagged, the correct interpretation may |
5011 | -- lie in the primitive or class-wide operations of the | |
5012 | -- type. Perform a simple conformance check to determine | |
5013 | -- whether Try_Object_Operation should be invoked even if | |
5014 | -- a visible entity is found. | |
5015 | ||
5016 | if Is_Tagged_Type (Prefix_Type) | |
f31dcd99 HK |
5017 | and then Nkind_In (Parent (N), N_Function_Call, |
5018 | N_Indexed_Component, | |
5019 | N_Procedure_Call_Statement) | |
d469eabe HK |
5020 | and then Has_Mode_Conformant_Spec (Comp) |
5021 | then | |
5022 | Has_Candidate := True; | |
5023 | end if; | |
5024 | ||
2383acbd AC |
5025 | -- Note: a selected component may not denote a component of a |
5026 | -- protected type (4.1.3(7)). | |
5027 | ||
bce79204 | 5028 | elsif Ekind_In (Comp, E_Discriminant, E_Entry_Family) |
2383acbd AC |
5029 | or else (In_Scope |
5030 | and then not Is_Protected_Type (Prefix_Type) | |
5031 | and then Is_Entity_Name (Name)) | |
996ae0b0 | 5032 | then |
e7ba564f | 5033 | Set_Entity_With_Checks (Sel, Comp); |
996ae0b0 RK |
5034 | Generate_Reference (Comp, Sel); |
5035 | ||
65e78a74 AC |
5036 | -- The selector is not overloadable, so we have a candidate |
5037 | -- interpretation. | |
5038 | ||
5039 | Has_Candidate := True; | |
5040 | ||
996ae0b0 | 5041 | else |
c0e938d0 AC |
5042 | if Ekind (Comp) = E_Component then |
5043 | Hidden_Comp := Comp; | |
5044 | end if; | |
5045 | ||
996ae0b0 RK |
5046 | goto Next_Comp; |
5047 | end if; | |
5048 | ||
5049 | Set_Etype (Sel, Etype (Comp)); | |
5050 | Set_Etype (N, Etype (Comp)); | |
5051 | ||
5052 | if Ekind (Comp) = E_Discriminant then | |
5053 | Set_Original_Discriminant (Sel, Comp); | |
5054 | end if; | |
5055 | ||
09494c32 AC |
5056 | -- For access type case, introduce explicit dereference for |
5057 | -- more uniform treatment of entry calls. | |
996ae0b0 RK |
5058 | |
5059 | if Is_Access_Type (Etype (Name)) then | |
5060 | Insert_Explicit_Dereference (Name); | |
fbf5a39b | 5061 | Error_Msg_NW |
324ac540 | 5062 | (Warn_On_Dereference, "?d?implicit dereference", N); |
996ae0b0 RK |
5063 | end if; |
5064 | end if; | |
5065 | ||
5066 | <<Next_Comp>> | |
c0e938d0 AC |
5067 | if Comp = First_Private_Entity (Type_To_Use) then |
5068 | if Etype (Sel) /= Any_Type then | |
5069 | ||
27de857e GD |
5070 | -- If the first private entity's name matches, then treat |
5071 | -- it as a private op: needed for the error check for | |
5072 | -- illegal selection of private entities further below. | |
5073 | ||
5074 | if Chars (Comp) = Chars (Sel) then | |
5075 | Is_Private_Op := True; | |
5076 | end if; | |
5077 | ||
5078 | -- We have a candidate, so exit the loop | |
c5b4738f | 5079 | |
c0e938d0 AC |
5080 | exit; |
5081 | ||
5082 | else | |
5083 | -- Indicate that subsequent operations are private, | |
5084 | -- for better error reporting. | |
5085 | ||
5086 | Is_Private_Op := True; | |
5087 | end if; | |
5088 | end if; | |
5089 | ||
614bc51c PMR |
5090 | -- Do not examine private operations if not within scope of |
5091 | -- the synchronized type. | |
5092 | ||
996ae0b0 | 5093 | exit when not In_Scope |
9bc856dd AC |
5094 | and then |
5095 | Comp = First_Private_Entity (Base_Type (Prefix_Type)); | |
614bc51c | 5096 | Next_Entity (Comp); |
996ae0b0 RK |
5097 | end loop; |
5098 | ||
b3083540 | 5099 | -- If the scope is a current instance, the prefix cannot be an |
0f6251c7 AC |
5100 | -- expression of the same type, unless the selector designates a |
5101 | -- public operation (otherwise that would represent an attempt to | |
5102 | -- reach an internal entity of another synchronized object). | |
be3416c6 | 5103 | |
b3083540 | 5104 | -- This is legal if prefix is an access to such type and there is |
0f6251c7 | 5105 | -- a dereference, or is a component with a dereferenced prefix. |
0f8b3e5d AC |
5106 | -- It is also legal if the prefix is a component of a task type, |
5107 | -- and the selector is one of the task operations. | |
b3083540 | 5108 | |
bd717ec9 AC |
5109 | if In_Scope |
5110 | and then not Is_Entity_Name (Name) | |
5111 | and then not Has_Dereference (Name) | |
5112 | then | |
0f8b3e5d AC |
5113 | if Is_Task_Type (Prefix_Type) |
5114 | and then Present (Entity (Sel)) | |
5115 | and then Ekind_In (Entity (Sel), E_Entry, E_Entry_Family) | |
5116 | then | |
5117 | null; | |
5118 | ||
d1eb8a82 AC |
5119 | elsif Is_Protected_Type (Prefix_Type) |
5120 | and then Is_Overloadable (Entity (Sel)) | |
5121 | and then not Is_Private_Op | |
5122 | then | |
5123 | null; | |
5124 | ||
0f8b3e5d AC |
5125 | else |
5126 | Error_Msg_NE | |
5127 | ("invalid reference to internal operation of some object of " | |
5128 | & "type &", N, Type_To_Use); | |
5129 | Set_Entity (Sel, Any_Id); | |
5130 | Set_Etype (Sel, Any_Type); | |
5131 | return; | |
5132 | end if; | |
be3416c6 AC |
5133 | |
5134 | -- Another special case: the prefix may denote an object of the type | |
5135 | -- (but not a type) in which case this is an external call and the | |
5136 | -- operation must be public. | |
5137 | ||
5138 | elsif In_Scope | |
5139 | and then Is_Object_Reference (Original_Node (Prefix (N))) | |
c0e938d0 | 5140 | and then Comes_From_Source (N) |
be3416c6 AC |
5141 | and then Is_Private_Op |
5142 | then | |
c0e938d0 AC |
5143 | if Present (Hidden_Comp) then |
5144 | Error_Msg_NE | |
c5b4738f AC |
5145 | ("invalid reference to private component of object of type " |
5146 | & "&", N, Type_To_Use); | |
c0e938d0 AC |
5147 | |
5148 | else | |
5149 | Error_Msg_NE | |
5150 | ("invalid reference to private operation of some object of " | |
5151 | & "type &", N, Type_To_Use); | |
5152 | end if; | |
5153 | ||
be3416c6 AC |
5154 | Set_Entity (Sel, Any_Id); |
5155 | Set_Etype (Sel, Any_Type); | |
5156 | return; | |
b3083540 AC |
5157 | end if; |
5158 | ||
d469eabe HK |
5159 | -- If there is no visible entity with the given name or none of the |
5160 | -- visible entities are plausible interpretations, check whether | |
5161 | -- there is some other primitive operation with that name. | |
aab883ec | 5162 | |
bc38dbb4 | 5163 | if Ada_Version >= Ada_2005 and then Is_Tagged_Type (Prefix_Type) then |
d469eabe HK |
5164 | if (Etype (N) = Any_Type |
5165 | or else not Has_Candidate) | |
0a36105d JM |
5166 | and then Try_Object_Operation (N) |
5167 | then | |
5168 | return; | |
5169 | ||
5170 | -- If the context is not syntactically a procedure call, it | |
5171 | -- may be a call to a primitive function declared outside of | |
5172 | -- the synchronized type. | |
5173 | ||
5174 | -- If the context is a procedure call, there might still be | |
5175 | -- an overloading between an entry and a primitive procedure | |
5176 | -- declared outside of the synchronized type, called in prefix | |
5177 | -- notation. This is harder to disambiguate because in one case | |
5178 | -- the controlling formal is implicit ??? | |
5179 | ||
5180 | elsif Nkind (Parent (N)) /= N_Procedure_Call_Statement | |
b4592168 | 5181 | and then Nkind (Parent (N)) /= N_Indexed_Component |
0a36105d JM |
5182 | and then Try_Object_Operation (N) |
5183 | then | |
5184 | return; | |
5185 | end if; | |
8cf23b91 AC |
5186 | |
5187 | -- Ada 2012 (AI05-0090-1): If we found a candidate of a call to an | |
5188 | -- entry or procedure of a tagged concurrent type we must check | |
5189 | -- if there are class-wide subprograms covering the primitive. If | |
5190 | -- true then Try_Object_Operation reports the error. | |
5191 | ||
5192 | if Has_Candidate | |
5193 | and then Is_Concurrent_Type (Prefix_Type) | |
5194 | and then Nkind (Parent (N)) = N_Procedure_Call_Statement | |
bc38dbb4 | 5195 | then |
8cf23b91 AC |
5196 | -- Duplicate the call. This is required to avoid problems with |
5197 | -- the tree transformations performed by Try_Object_Operation. | |
d7a44b14 AC |
5198 | -- Set properly the parent of the copied call, because it is |
5199 | -- about to be reanalyzed. | |
8cf23b91 | 5200 | |
d7a44b14 AC |
5201 | declare |
5202 | Par : constant Node_Id := New_Copy_Tree (Parent (N)); | |
5203 | ||
5204 | begin | |
5205 | Set_Parent (Par, Parent (Parent (N))); | |
29ba9f52 | 5206 | |
d7a44b14 | 5207 | if Try_Object_Operation |
29ba9f52 | 5208 | (Sinfo.Name (Par), CW_Test_Only => True) |
d7a44b14 AC |
5209 | then |
5210 | return; | |
5211 | end if; | |
5212 | end; | |
8cf23b91 | 5213 | end if; |
aab883ec ES |
5214 | end if; |
5215 | ||
2383acbd | 5216 | if Etype (N) = Any_Type and then Is_Protected_Type (Prefix_Type) then |
11bc76df | 5217 | |
2383acbd AC |
5218 | -- Case of a prefix of a protected type: selector might denote |
5219 | -- an invisible private component. | |
5220 | ||
5221 | Comp := First_Private_Entity (Base_Type (Prefix_Type)); | |
5222 | while Present (Comp) and then Chars (Comp) /= Chars (Sel) loop | |
5223 | Next_Entity (Comp); | |
5224 | end loop; | |
5225 | ||
5226 | if Present (Comp) then | |
5227 | if Is_Single_Concurrent_Object then | |
5228 | Error_Msg_Node_2 := Entity (Name); | |
5229 | Error_Msg_NE ("invisible selector& for &", N, Sel); | |
5230 | ||
5231 | else | |
5232 | Error_Msg_Node_2 := First_Subtype (Prefix_Type); | |
5233 | Error_Msg_NE ("invisible selector& for }", N, Sel); | |
5234 | end if; | |
5235 | return; | |
5236 | end if; | |
5237 | end if; | |
5238 | ||
996ae0b0 RK |
5239 | Set_Is_Overloaded (N, Is_Overloaded (Sel)); |
5240 | ||
5241 | else | |
5242 | -- Invalid prefix | |
5243 | ||
5244 | Error_Msg_NE ("invalid prefix in selected component&", N, Sel); | |
5245 | end if; | |
5246 | ||
4c46b835 | 5247 | -- If N still has no type, the component is not defined in the prefix |
996ae0b0 RK |
5248 | |
5249 | if Etype (N) = Any_Type then | |
5250 | ||
2383acbd | 5251 | if Is_Single_Concurrent_Object then |
996ae0b0 RK |
5252 | Error_Msg_Node_2 := Entity (Name); |
5253 | Error_Msg_NE ("no selector& for&", N, Sel); | |
5254 | ||
401093c1 | 5255 | Check_Misspelled_Selector (Type_To_Use, Sel); |
996ae0b0 | 5256 | |
8b4230c8 AC |
5257 | -- If this is a derived formal type, the parent may have different |
5258 | -- visibility at this point. Try for an inherited component before | |
5259 | -- reporting an error. | |
5260 | ||
de76a39c GB |
5261 | elsif Is_Generic_Type (Prefix_Type) |
5262 | and then Ekind (Prefix_Type) = E_Record_Type_With_Private | |
07fc65c4 | 5263 | and then Prefix_Type /= Etype (Prefix_Type) |
de76a39c GB |
5264 | and then Is_Record_Type (Etype (Prefix_Type)) |
5265 | then | |
de76a39c GB |
5266 | Set_Etype (Prefix (N), Etype (Prefix_Type)); |
5267 | Analyze_Selected_Component (N); | |
5268 | return; | |
5269 | ||
b1d12996 AC |
5270 | -- Similarly, if this is the actual for a formal derived type, or |
5271 | -- a derived type thereof, the component inherited from the generic | |
5272 | -- parent may not be visible in the actual, but the selected | |
5273 | -- component is legal. Climb up the derivation chain of the generic | |
5274 | -- parent type until we find the proper ancestor type. | |
20261dc1 | 5275 | |
b1d12996 AC |
5276 | elsif In_Instance and then Is_Tagged_Type (Prefix_Type) then |
5277 | declare | |
5278 | Par : Entity_Id := Prefix_Type; | |
5279 | begin | |
5280 | -- Climb up derivation chain to generic actual subtype | |
5281 | ||
5282 | while not Is_Generic_Actual_Type (Par) loop | |
5283 | if Ekind (Par) = E_Record_Type then | |
5284 | Par := Parent_Subtype (Par); | |
5285 | exit when No (Par); | |
5286 | else | |
5287 | exit when Par = Etype (Par); | |
5288 | Par := Etype (Par); | |
5289 | end if; | |
5290 | end loop; | |
4c46b835 | 5291 | |
b1d12996 | 5292 | if Present (Par) and then Is_Generic_Actual_Type (Par) then |
73999267 | 5293 | |
b1d12996 | 5294 | -- Now look for component in ancestor types |
fbf5a39b | 5295 | |
b1d12996 AC |
5296 | Par := Generic_Parent_Type (Declaration_Node (Par)); |
5297 | loop | |
5298 | Find_Component_In_Instance (Par); | |
5299 | exit when Present (Entity (Sel)) | |
5300 | or else Par = Etype (Par); | |
5301 | Par := Etype (Par); | |
5302 | end loop; | |
73999267 | 5303 | |
7d9880c9 AC |
5304 | -- Another special case: the type is an extension of a private |
5305 | -- type T, is an actual in an instance, and we are in the body | |
5306 | -- of the instance, so the generic body had a full view of the | |
5307 | -- type declaration for T or of some ancestor that defines the | |
5308 | -- component in question. | |
5309 | ||
5310 | elsif Is_Derived_Type (Type_To_Use) | |
5311 | and then Used_As_Generic_Actual (Type_To_Use) | |
5312 | and then In_Instance_Body | |
5313 | then | |
5314 | Find_Component_In_Instance (Parent_Subtype (Type_To_Use)); | |
5315 | ||
73999267 AC |
5316 | -- In ASIS mode the generic parent type may be absent. Examine |
5317 | -- the parent type directly for a component that may have been | |
5318 | -- visible in a parent generic unit. | |
5319 | ||
5320 | elsif Is_Derived_Type (Prefix_Type) then | |
5321 | Par := Etype (Prefix_Type); | |
5322 | Find_Component_In_Instance (Par); | |
b1d12996 AC |
5323 | end if; |
5324 | end; | |
5325 | ||
5326 | -- The search above must have eventually succeeded, since the | |
5327 | -- selected component was legal in the generic. | |
5328 | ||
5329 | if No (Entity (Sel)) then | |
5330 | raise Program_Error; | |
5331 | end if; | |
73999267 | 5332 | |
20261dc1 | 5333 | return; |
fbf5a39b | 5334 | |
20261dc1 | 5335 | -- Component not found, specialize error message when appropriate |
fbf5a39b | 5336 | |
996ae0b0 RK |
5337 | else |
5338 | if Ekind (Prefix_Type) = E_Record_Subtype then | |
5339 | ||
f4b049db AC |
5340 | -- Check whether this is a component of the base type which |
5341 | -- is absent from a statically constrained subtype. This will | |
5342 | -- raise constraint error at run time, but is not a compile- | |
5343 | -- time error. When the selector is illegal for base type as | |
5344 | -- well fall through and generate a compilation error anyway. | |
996ae0b0 RK |
5345 | |
5346 | Comp := First_Component (Base_Type (Prefix_Type)); | |
996ae0b0 | 5347 | while Present (Comp) loop |
996ae0b0 | 5348 | if Chars (Comp) = Chars (Sel) |
24e95966 | 5349 | and then Is_Visible_Component (Comp, Sel) |
996ae0b0 | 5350 | then |
e7ba564f | 5351 | Set_Entity_With_Checks (Sel, Comp); |
996ae0b0 RK |
5352 | Generate_Reference (Comp, Sel); |
5353 | Set_Etype (Sel, Etype (Comp)); | |
5354 | Set_Etype (N, Etype (Comp)); | |
5355 | ||
637a41a5 AC |
5356 | -- Emit appropriate message. The node will be replaced |
5357 | -- by an appropriate raise statement. | |
996ae0b0 | 5358 | |
637a41a5 AC |
5359 | -- Note that in SPARK mode, as with all calls to apply a |
5360 | -- compile time constraint error, this will be made into | |
5361 | -- an error to simplify the processing of the formal | |
5362 | -- verification backend. | |
d7f41b2d | 5363 | |
4a28b181 | 5364 | Apply_Compile_Time_Constraint_Error |
637a41a5 | 5365 | (N, "component not present in }??", |
4a28b181 AC |
5366 | CE_Discriminant_Check_Failed, |
5367 | Ent => Prefix_Type, Rep => False); | |
d7f41b2d | 5368 | |
996ae0b0 RK |
5369 | Set_Raises_Constraint_Error (N); |
5370 | return; | |
5371 | end if; | |
5372 | ||
5373 | Next_Component (Comp); | |
5374 | end loop; | |
5375 | ||
5376 | end if; | |
5377 | ||
5378 | Error_Msg_Node_2 := First_Subtype (Prefix_Type); | |
5379 | Error_Msg_NE ("no selector& for}", N, Sel); | |
5380 | ||
94bbf008 | 5381 | -- Add information in the case of an incomplete prefix |
99d520ad ES |
5382 | |
5383 | if Is_Incomplete_Type (Type_To_Use) then | |
5384 | declare | |
5385 | Inc : constant Entity_Id := First_Subtype (Type_To_Use); | |
5386 | ||
5387 | begin | |
7b56a91b | 5388 | if From_Limited_With (Scope (Type_To_Use)) then |
99d520ad ES |
5389 | Error_Msg_NE |
5390 | ("\limited view of& has no components", N, Inc); | |
bd38b431 | 5391 | |
99d520ad ES |
5392 | else |
5393 | Error_Msg_NE | |
5394 | ("\premature usage of incomplete type&", N, Inc); | |
bd38b431 AC |
5395 | |
5396 | if Nkind (Parent (Inc)) = | |
5397 | N_Incomplete_Type_Declaration | |
99d520ad | 5398 | then |
94bbf008 AC |
5399 | -- Record location of premature use in entity so that |
5400 | -- a continuation message is generated when the | |
5401 | -- completion is seen. | |
5402 | ||
99d520ad ES |
5403 | Set_Premature_Use (Parent (Inc), N); |
5404 | end if; | |
5405 | end if; | |
5406 | end; | |
5407 | end if; | |
5408 | ||
401093c1 | 5409 | Check_Misspelled_Selector (Type_To_Use, Sel); |
996ae0b0 RK |
5410 | end if; |
5411 | ||
5412 | Set_Entity (Sel, Any_Id); | |
5413 | Set_Etype (Sel, Any_Type); | |
5414 | end if; | |
5415 | end Analyze_Selected_Component; | |
5416 | ||
5417 | --------------------------- | |
5418 | -- Analyze_Short_Circuit -- | |
5419 | --------------------------- | |
5420 | ||
5421 | procedure Analyze_Short_Circuit (N : Node_Id) is | |
5422 | L : constant Node_Id := Left_Opnd (N); | |
5423 | R : constant Node_Id := Right_Opnd (N); | |
5424 | Ind : Interp_Index; | |
5425 | It : Interp; | |
5426 | ||
5427 | begin | |
5428 | Analyze_Expression (L); | |
5429 | Analyze_Expression (R); | |
5430 | Set_Etype (N, Any_Type); | |
5431 | ||
5432 | if not Is_Overloaded (L) then | |
996ae0b0 RK |
5433 | if Root_Type (Etype (L)) = Standard_Boolean |
5434 | and then Has_Compatible_Type (R, Etype (L)) | |
5435 | then | |
5436 | Add_One_Interp (N, Etype (L), Etype (L)); | |
5437 | end if; | |
5438 | ||
5439 | else | |
5440 | Get_First_Interp (L, Ind, It); | |
996ae0b0 RK |
5441 | while Present (It.Typ) loop |
5442 | if Root_Type (It.Typ) = Standard_Boolean | |
5443 | and then Has_Compatible_Type (R, It.Typ) | |
5444 | then | |
5445 | Add_One_Interp (N, It.Typ, It.Typ); | |
5446 | end if; | |
5447 | ||
5448 | Get_Next_Interp (Ind, It); | |
5449 | end loop; | |
5450 | end if; | |
5451 | ||
d469eabe HK |
5452 | -- Here we have failed to find an interpretation. Clearly we know that |
5453 | -- it is not the case that both operands can have an interpretation of | |
5454 | -- Boolean, but this is by far the most likely intended interpretation. | |
5455 | -- So we simply resolve both operands as Booleans, and at least one of | |
5456 | -- these resolutions will generate an error message, and we do not need | |
5457 | -- to give another error message on the short circuit operation itself. | |
996ae0b0 RK |
5458 | |
5459 | if Etype (N) = Any_Type then | |
5460 | Resolve (L, Standard_Boolean); | |
5461 | Resolve (R, Standard_Boolean); | |
5462 | Set_Etype (N, Standard_Boolean); | |
5463 | end if; | |
5464 | end Analyze_Short_Circuit; | |
5465 | ||
5466 | ------------------- | |
5467 | -- Analyze_Slice -- | |
5468 | ------------------- | |
5469 | ||
5470 | procedure Analyze_Slice (N : Node_Id) is | |
996ae0b0 | 5471 | D : constant Node_Id := Discrete_Range (N); |
5f44f0d4 | 5472 | P : constant Node_Id := Prefix (N); |
996ae0b0 | 5473 | Array_Type : Entity_Id; |
5f44f0d4 | 5474 | Index_Type : Entity_Id; |
996ae0b0 RK |
5475 | |
5476 | procedure Analyze_Overloaded_Slice; | |
5477 | -- If the prefix is overloaded, select those interpretations that | |
5478 | -- yield a one-dimensional array type. | |
5479 | ||
4c46b835 AC |
5480 | ------------------------------ |
5481 | -- Analyze_Overloaded_Slice -- | |
5482 | ------------------------------ | |
5483 | ||
996ae0b0 RK |
5484 | procedure Analyze_Overloaded_Slice is |
5485 | I : Interp_Index; | |
5486 | It : Interp; | |
5487 | Typ : Entity_Id; | |
5488 | ||
5489 | begin | |
5490 | Set_Etype (N, Any_Type); | |
996ae0b0 | 5491 | |
4c46b835 | 5492 | Get_First_Interp (P, I, It); |
996ae0b0 RK |
5493 | while Present (It.Nam) loop |
5494 | Typ := It.Typ; | |
5495 | ||
5496 | if Is_Access_Type (Typ) then | |
5497 | Typ := Designated_Type (Typ); | |
324ac540 AC |
5498 | Error_Msg_NW |
5499 | (Warn_On_Dereference, "?d?implicit dereference", N); | |
996ae0b0 RK |
5500 | end if; |
5501 | ||
5502 | if Is_Array_Type (Typ) | |
5503 | and then Number_Dimensions (Typ) = 1 | |
5504 | and then Has_Compatible_Type (D, Etype (First_Index (Typ))) | |
5505 | then | |
5506 | Add_One_Interp (N, Typ, Typ); | |
5507 | end if; | |
5508 | ||
5509 | Get_Next_Interp (I, It); | |
5510 | end loop; | |
5511 | ||
5512 | if Etype (N) = Any_Type then | |
5513 | Error_Msg_N ("expect array type in prefix of slice", N); | |
5514 | end if; | |
5515 | end Analyze_Overloaded_Slice; | |
5516 | ||
5517 | -- Start of processing for Analyze_Slice | |
5518 | ||
5519 | begin | |
36b8f95f | 5520 | if Comes_From_Source (N) then |
ce5ba43a | 5521 | Check_SPARK_05_Restriction ("slice is not allowed", N); |
36b8f95f | 5522 | end if; |
1d801f21 | 5523 | |
523456db | 5524 | Analyze (P); |
996ae0b0 RK |
5525 | Analyze (D); |
5526 | ||
5527 | if Is_Overloaded (P) then | |
5528 | Analyze_Overloaded_Slice; | |
5529 | ||
5530 | else | |
5531 | Array_Type := Etype (P); | |
5532 | Set_Etype (N, Any_Type); | |
5533 | ||
5534 | if Is_Access_Type (Array_Type) then | |
5535 | Array_Type := Designated_Type (Array_Type); | |
324ac540 | 5536 | Error_Msg_NW (Warn_On_Dereference, "?d?implicit dereference", N); |
996ae0b0 RK |
5537 | end if; |
5538 | ||
5539 | if not Is_Array_Type (Array_Type) then | |
5540 | Wrong_Type (P, Any_Array); | |
5541 | ||
5542 | elsif Number_Dimensions (Array_Type) > 1 then | |
5543 | Error_Msg_N | |
5544 | ("type is not one-dimensional array in slice prefix", N); | |
5545 | ||
996ae0b0 | 5546 | else |
5f44f0d4 AC |
5547 | if Ekind (Array_Type) = E_String_Literal_Subtype then |
5548 | Index_Type := Etype (String_Literal_Low_Bound (Array_Type)); | |
5549 | else | |
5550 | Index_Type := Etype (First_Index (Array_Type)); | |
5551 | end if; | |
5552 | ||
5553 | if not Has_Compatible_Type (D, Index_Type) then | |
5554 | Wrong_Type (D, Index_Type); | |
5555 | else | |
5556 | Set_Etype (N, Array_Type); | |
5557 | end if; | |
996ae0b0 RK |
5558 | end if; |
5559 | end if; | |
5560 | end Analyze_Slice; | |
5561 | ||
5562 | ----------------------------- | |
5563 | -- Analyze_Type_Conversion -- | |
5564 | ----------------------------- | |
5565 | ||
5566 | procedure Analyze_Type_Conversion (N : Node_Id) is | |
5567 | Expr : constant Node_Id := Expression (N); | |
039538bc | 5568 | Typ : Entity_Id; |
996ae0b0 RK |
5569 | |
5570 | begin | |
039538bc AC |
5571 | -- If Conversion_OK is set, then the Etype is already set, and the only |
5572 | -- processing required is to analyze the expression. This is used to | |
5573 | -- construct certain "illegal" conversions which are not allowed by Ada | |
5574 | -- semantics, but can be handled by Gigi, see Sinfo for further details. | |
996ae0b0 RK |
5575 | |
5576 | if Conversion_OK (N) then | |
5577 | Analyze (Expr); | |
5578 | return; | |
5579 | end if; | |
5580 | ||
5581 | -- Otherwise full type analysis is required, as well as some semantic | |
5582 | -- checks to make sure the argument of the conversion is appropriate. | |
5583 | ||
5584 | Find_Type (Subtype_Mark (N)); | |
039538bc AC |
5585 | Typ := Entity (Subtype_Mark (N)); |
5586 | Set_Etype (N, Typ); | |
5587 | Check_Fully_Declared (Typ, N); | |
996ae0b0 RK |
5588 | Analyze_Expression (Expr); |
5589 | Validate_Remote_Type_Type_Conversion (N); | |
5e8c8e44 | 5590 | |
996ae0b0 RK |
5591 | -- Only remaining step is validity checks on the argument. These |
5592 | -- are skipped if the conversion does not come from the source. | |
5593 | ||
5594 | if not Comes_From_Source (N) then | |
5595 | return; | |
5596 | ||
b67a385c ES |
5597 | -- If there was an error in a generic unit, no need to replicate the |
5598 | -- error message. Conversely, constant-folding in the generic may | |
5599 | -- transform the argument of a conversion into a string literal, which | |
5600 | -- is legal. Therefore the following tests are not performed in an | |
36428cc4 | 5601 | -- instance. The same applies to an inlined body. |
b67a385c | 5602 | |
36428cc4 | 5603 | elsif In_Instance or In_Inlined_Body then |
b67a385c ES |
5604 | return; |
5605 | ||
996ae0b0 RK |
5606 | elsif Nkind (Expr) = N_Null then |
5607 | Error_Msg_N ("argument of conversion cannot be null", N); | |
ed2233dc | 5608 | Error_Msg_N ("\use qualified expression instead", N); |
996ae0b0 RK |
5609 | Set_Etype (N, Any_Type); |
5610 | ||
5611 | elsif Nkind (Expr) = N_Aggregate then | |
5612 | Error_Msg_N ("argument of conversion cannot be aggregate", N); | |
ed2233dc | 5613 | Error_Msg_N ("\use qualified expression instead", N); |
996ae0b0 RK |
5614 | |
5615 | elsif Nkind (Expr) = N_Allocator then | |
5616 | Error_Msg_N ("argument of conversion cannot be an allocator", N); | |
ed2233dc | 5617 | Error_Msg_N ("\use qualified expression instead", N); |
996ae0b0 RK |
5618 | |
5619 | elsif Nkind (Expr) = N_String_Literal then | |
5620 | Error_Msg_N ("argument of conversion cannot be string literal", N); | |
ed2233dc | 5621 | Error_Msg_N ("\use qualified expression instead", N); |
996ae0b0 RK |
5622 | |
5623 | elsif Nkind (Expr) = N_Character_Literal then | |
0ab80019 | 5624 | if Ada_Version = Ada_83 then |
039538bc | 5625 | Resolve (Expr, Typ); |
996ae0b0 RK |
5626 | else |
5627 | Error_Msg_N ("argument of conversion cannot be character literal", | |
5628 | N); | |
ed2233dc | 5629 | Error_Msg_N ("\use qualified expression instead", N); |
996ae0b0 RK |
5630 | end if; |
5631 | ||
5632 | elsif Nkind (Expr) = N_Attribute_Reference | |
039538bc AC |
5633 | and then Nam_In (Attribute_Name (Expr), Name_Access, |
5634 | Name_Unchecked_Access, | |
5635 | Name_Unrestricted_Access) | |
996ae0b0 RK |
5636 | then |
5637 | Error_Msg_N ("argument of conversion cannot be access", N); | |
ed2233dc | 5638 | Error_Msg_N ("\use qualified expression instead", N); |
996ae0b0 | 5639 | end if; |
039538bc AC |
5640 | |
5641 | -- A formal parameter of a specific tagged type whose related subprogram | |
5642 | -- is subject to pragma Extensions_Visible with value "False" cannot | |
070d862d HK |
5643 | -- appear in a class-wide conversion (SPARK RM 6.1.7(3)). Do not check |
5644 | -- internally generated expressions. | |
039538bc | 5645 | |
070d862d HK |
5646 | if Is_Class_Wide_Type (Typ) |
5647 | and then Comes_From_Source (Expr) | |
5648 | and then Is_EVF_Expression (Expr) | |
5649 | then | |
039538bc | 5650 | Error_Msg_N |
44900051 AC |
5651 | ("formal parameter cannot be converted to class-wide type when " |
5652 | & "Extensions_Visible is False", Expr); | |
039538bc | 5653 | end if; |
996ae0b0 RK |
5654 | end Analyze_Type_Conversion; |
5655 | ||
5656 | ---------------------- | |
5657 | -- Analyze_Unary_Op -- | |
5658 | ---------------------- | |
5659 | ||
5660 | procedure Analyze_Unary_Op (N : Node_Id) is | |
5661 | R : constant Node_Id := Right_Opnd (N); | |
5662 | Op_Id : Entity_Id := Entity (N); | |
5663 | ||
5664 | begin | |
5665 | Set_Etype (N, Any_Type); | |
5666 | Candidate_Type := Empty; | |
5667 | ||
5668 | Analyze_Expression (R); | |
5669 | ||
5670 | if Present (Op_Id) then | |
5671 | if Ekind (Op_Id) = E_Operator then | |
5672 | Find_Unary_Types (R, Op_Id, N); | |
5673 | else | |
5674 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
5675 | end if; | |
5676 | ||
5677 | else | |
5678 | Op_Id := Get_Name_Entity_Id (Chars (N)); | |
996ae0b0 | 5679 | while Present (Op_Id) loop |
996ae0b0 RK |
5680 | if Ekind (Op_Id) = E_Operator then |
5681 | if No (Next_Entity (First_Entity (Op_Id))) then | |
5682 | Find_Unary_Types (R, Op_Id, N); | |
5683 | end if; | |
5684 | ||
5685 | elsif Is_Overloadable (Op_Id) then | |
5686 | Analyze_User_Defined_Unary_Op (N, Op_Id); | |
5687 | end if; | |
5688 | ||
5689 | Op_Id := Homonym (Op_Id); | |
5690 | end loop; | |
5691 | end if; | |
5692 | ||
5693 | Operator_Check (N); | |
5694 | end Analyze_Unary_Op; | |
5695 | ||
5696 | ---------------------------------- | |
5697 | -- Analyze_Unchecked_Expression -- | |
5698 | ---------------------------------- | |
5699 | ||
5700 | procedure Analyze_Unchecked_Expression (N : Node_Id) is | |
5701 | begin | |
5702 | Analyze (Expression (N), Suppress => All_Checks); | |
5703 | Set_Etype (N, Etype (Expression (N))); | |
5704 | Save_Interps (Expression (N), N); | |
5705 | end Analyze_Unchecked_Expression; | |
5706 | ||
5707 | --------------------------------------- | |
5708 | -- Analyze_Unchecked_Type_Conversion -- | |
5709 | --------------------------------------- | |
5710 | ||
5711 | procedure Analyze_Unchecked_Type_Conversion (N : Node_Id) is | |
5712 | begin | |
5713 | Find_Type (Subtype_Mark (N)); | |
5714 | Analyze_Expression (Expression (N)); | |
5715 | Set_Etype (N, Entity (Subtype_Mark (N))); | |
5716 | end Analyze_Unchecked_Type_Conversion; | |
5717 | ||
5718 | ------------------------------------ | |
5719 | -- Analyze_User_Defined_Binary_Op -- | |
5720 | ------------------------------------ | |
5721 | ||
5722 | procedure Analyze_User_Defined_Binary_Op | |
5723 | (N : Node_Id; | |
5724 | Op_Id : Entity_Id) | |
5725 | is | |
5726 | begin | |
5727 | -- Only do analysis if the operator Comes_From_Source, since otherwise | |
5728 | -- the operator was generated by the expander, and all such operators | |
5729 | -- always refer to the operators in package Standard. | |
5730 | ||
5731 | if Comes_From_Source (N) then | |
5732 | declare | |
5733 | F1 : constant Entity_Id := First_Formal (Op_Id); | |
5734 | F2 : constant Entity_Id := Next_Formal (F1); | |
5735 | ||
5736 | begin | |
5737 | -- Verify that Op_Id is a visible binary function. Note that since | |
5738 | -- we know Op_Id is overloaded, potentially use visible means use | |
5739 | -- visible for sure (RM 9.4(11)). | |
5740 | ||
5741 | if Ekind (Op_Id) = E_Function | |
5742 | and then Present (F2) | |
5743 | and then (Is_Immediately_Visible (Op_Id) | |
5744 | or else Is_Potentially_Use_Visible (Op_Id)) | |
5745 | and then Has_Compatible_Type (Left_Opnd (N), Etype (F1)) | |
5746 | and then Has_Compatible_Type (Right_Opnd (N), Etype (F2)) | |
5747 | then | |
5748 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
5749 | ||
8b4230c8 AC |
5750 | -- If the left operand is overloaded, indicate that the current |
5751 | -- type is a viable candidate. This is redundant in most cases, | |
5752 | -- but for equality and comparison operators where the context | |
5753 | -- does not impose a type on the operands, setting the proper | |
5754 | -- type is necessary to avoid subsequent ambiguities during | |
5755 | -- resolution, when both user-defined and predefined operators | |
5756 | -- may be candidates. | |
7340e432 AC |
5757 | |
5758 | if Is_Overloaded (Left_Opnd (N)) then | |
5759 | Set_Etype (Left_Opnd (N), Etype (F1)); | |
5760 | end if; | |
5761 | ||
996ae0b0 RK |
5762 | if Debug_Flag_E then |
5763 | Write_Str ("user defined operator "); | |
5764 | Write_Name (Chars (Op_Id)); | |
5765 | Write_Str (" on node "); | |
5766 | Write_Int (Int (N)); | |
5767 | Write_Eol; | |
5768 | end if; | |
5769 | end if; | |
5770 | end; | |
5771 | end if; | |
5772 | end Analyze_User_Defined_Binary_Op; | |
5773 | ||
5774 | ----------------------------------- | |
5775 | -- Analyze_User_Defined_Unary_Op -- | |
5776 | ----------------------------------- | |
5777 | ||
5778 | procedure Analyze_User_Defined_Unary_Op | |
5779 | (N : Node_Id; | |
5780 | Op_Id : Entity_Id) | |
5781 | is | |
5782 | begin | |
5783 | -- Only do analysis if the operator Comes_From_Source, since otherwise | |
5784 | -- the operator was generated by the expander, and all such operators | |
5785 | -- always refer to the operators in package Standard. | |
5786 | ||
5787 | if Comes_From_Source (N) then | |
5788 | declare | |
5789 | F : constant Entity_Id := First_Formal (Op_Id); | |
5790 | ||
5791 | begin | |
5792 | -- Verify that Op_Id is a visible unary function. Note that since | |
5793 | -- we know Op_Id is overloaded, potentially use visible means use | |
5794 | -- visible for sure (RM 9.4(11)). | |
5795 | ||
5796 | if Ekind (Op_Id) = E_Function | |
5797 | and then No (Next_Formal (F)) | |
5798 | and then (Is_Immediately_Visible (Op_Id) | |
5799 | or else Is_Potentially_Use_Visible (Op_Id)) | |
5800 | and then Has_Compatible_Type (Right_Opnd (N), Etype (F)) | |
5801 | then | |
5802 | Add_One_Interp (N, Op_Id, Etype (Op_Id)); | |
5803 | end if; | |
5804 | end; | |
5805 | end if; | |
5806 | end Analyze_User_Defined_Unary_Op; | |
5807 | ||
5808 | --------------------------- | |
5809 | -- Check_Arithmetic_Pair -- | |
5810 | --------------------------- | |
5811 | ||
5812 | procedure Check_Arithmetic_Pair | |
5813 | (T1, T2 : Entity_Id; | |
5814 | Op_Id : Entity_Id; | |
5815 | N : Node_Id) | |
5816 | is | |
401093c1 | 5817 | Op_Name : constant Name_Id := Chars (Op_Id); |
996ae0b0 | 5818 | |
da709d08 AC |
5819 | function Has_Fixed_Op (Typ : Entity_Id; Op : Entity_Id) return Boolean; |
5820 | -- Check whether the fixed-point type Typ has a user-defined operator | |
5821 | -- (multiplication or division) that should hide the corresponding | |
5822 | -- predefined operator. Used to implement Ada 2005 AI-264, to make | |
5823 | -- such operators more visible and therefore useful. | |
8b4230c8 | 5824 | -- |
50cff367 GD |
5825 | -- If the name of the operation is an expanded name with prefix |
5826 | -- Standard, the predefined universal fixed operator is available, | |
5827 | -- as specified by AI-420 (RM 4.5.5 (19.1/2)). | |
5828 | ||
996ae0b0 RK |
5829 | function Specific_Type (T1, T2 : Entity_Id) return Entity_Id; |
5830 | -- Get specific type (i.e. non-universal type if there is one) | |
5831 | ||
da709d08 AC |
5832 | ------------------ |
5833 | -- Has_Fixed_Op -- | |
5834 | ------------------ | |
5835 | ||
5836 | function Has_Fixed_Op (Typ : Entity_Id; Op : Entity_Id) return Boolean is | |
401093c1 | 5837 | Bas : constant Entity_Id := Base_Type (Typ); |
da709d08 AC |
5838 | Ent : Entity_Id; |
5839 | F1 : Entity_Id; | |
5840 | F2 : Entity_Id; | |
5841 | ||
5842 | begin | |
50cff367 GD |
5843 | -- If the universal_fixed operation is given explicitly the rule |
5844 | -- concerning primitive operations of the type do not apply. | |
5845 | ||
5846 | if Nkind (N) = N_Function_Call | |
5847 | and then Nkind (Name (N)) = N_Expanded_Name | |
5848 | and then Entity (Prefix (Name (N))) = Standard_Standard | |
5849 | then | |
5850 | return False; | |
5851 | end if; | |
5852 | ||
da709d08 AC |
5853 | -- The operation is treated as primitive if it is declared in the |
5854 | -- same scope as the type, and therefore on the same entity chain. | |
5855 | ||
5856 | Ent := Next_Entity (Typ); | |
5857 | while Present (Ent) loop | |
5858 | if Chars (Ent) = Chars (Op) then | |
5859 | F1 := First_Formal (Ent); | |
5860 | F2 := Next_Formal (F1); | |
5861 | ||
5862 | -- The operation counts as primitive if either operand or | |
401093c1 ES |
5863 | -- result are of the given base type, and both operands are |
5864 | -- fixed point types. | |
da709d08 | 5865 | |
401093c1 | 5866 | if (Base_Type (Etype (F1)) = Bas |
da709d08 AC |
5867 | and then Is_Fixed_Point_Type (Etype (F2))) |
5868 | ||
5869 | or else | |
401093c1 | 5870 | (Base_Type (Etype (F2)) = Bas |
da709d08 AC |
5871 | and then Is_Fixed_Point_Type (Etype (F1))) |
5872 | ||
5873 | or else | |
401093c1 | 5874 | (Base_Type (Etype (Ent)) = Bas |
da709d08 AC |
5875 | and then Is_Fixed_Point_Type (Etype (F1)) |
5876 | and then Is_Fixed_Point_Type (Etype (F2))) | |
5877 | then | |
5878 | return True; | |
5879 | end if; | |
5880 | end if; | |
5881 | ||
5882 | Next_Entity (Ent); | |
5883 | end loop; | |
5884 | ||
5885 | return False; | |
5886 | end Has_Fixed_Op; | |
5887 | ||
4c46b835 AC |
5888 | ------------------- |
5889 | -- Specific_Type -- | |
5890 | ------------------- | |
5891 | ||
996ae0b0 RK |
5892 | function Specific_Type (T1, T2 : Entity_Id) return Entity_Id is |
5893 | begin | |
5894 | if T1 = Universal_Integer or else T1 = Universal_Real then | |
5895 | return Base_Type (T2); | |
5896 | else | |
5897 | return Base_Type (T1); | |
5898 | end if; | |
5899 | end Specific_Type; | |
5900 | ||
5901 | -- Start of processing for Check_Arithmetic_Pair | |
5902 | ||
5903 | begin | |
b69cd36a | 5904 | if Nam_In (Op_Name, Name_Op_Add, Name_Op_Subtract) then |
996ae0b0 RK |
5905 | if Is_Numeric_Type (T1) |
5906 | and then Is_Numeric_Type (T2) | |
b4592168 GD |
5907 | and then (Covers (T1 => T1, T2 => T2) |
5908 | or else | |
5909 | Covers (T1 => T2, T2 => T1)) | |
996ae0b0 RK |
5910 | then |
5911 | Add_One_Interp (N, Op_Id, Specific_Type (T1, T2)); | |
5912 | end if; | |
5913 | ||
b69cd36a | 5914 | elsif Nam_In (Op_Name, Name_Op_Multiply, Name_Op_Divide) then |
996ae0b0 | 5915 | if Is_Fixed_Point_Type (T1) |
b69cd36a | 5916 | and then (Is_Fixed_Point_Type (T2) or else T2 = Universal_Real) |
996ae0b0 RK |
5917 | then |
5918 | -- If Treat_Fixed_As_Integer is set then the Etype is already set | |
5919 | -- and no further processing is required (this is the case of an | |
5920 | -- operator constructed by Exp_Fixd for a fixed point operation) | |
5921 | -- Otherwise add one interpretation with universal fixed result | |
21d7ef70 | 5922 | -- If the operator is given in functional notation, it comes |
996ae0b0 RK |
5923 | -- from source and Fixed_As_Integer cannot apply. |
5924 | ||
da709d08 AC |
5925 | if (Nkind (N) not in N_Op |
5926 | or else not Treat_Fixed_As_Integer (N)) | |
5927 | and then | |
401093c1 | 5928 | (not Has_Fixed_Op (T1, Op_Id) |
da709d08 | 5929 | or else Nkind (Parent (N)) = N_Type_Conversion) |
fbf5a39b | 5930 | then |
996ae0b0 RK |
5931 | Add_One_Interp (N, Op_Id, Universal_Fixed); |
5932 | end if; | |
5933 | ||
5934 | elsif Is_Fixed_Point_Type (T2) | |
5935 | and then (Nkind (N) not in N_Op | |
5936 | or else not Treat_Fixed_As_Integer (N)) | |
5937 | and then T1 = Universal_Real | |
da709d08 | 5938 | and then |
401093c1 | 5939 | (not Has_Fixed_Op (T1, Op_Id) |
da709d08 | 5940 | or else Nkind (Parent (N)) = N_Type_Conversion) |
996ae0b0 RK |
5941 | then |
5942 | Add_One_Interp (N, Op_Id, Universal_Fixed); | |
5943 | ||
5944 | elsif Is_Numeric_Type (T1) | |
5945 | and then Is_Numeric_Type (T2) | |
b4592168 GD |
5946 | and then (Covers (T1 => T1, T2 => T2) |
5947 | or else | |
5948 | Covers (T1 => T2, T2 => T1)) | |
996ae0b0 RK |
5949 | then |
5950 | Add_One_Interp (N, Op_Id, Specific_Type (T1, T2)); | |
5951 | ||
5952 | elsif Is_Fixed_Point_Type (T1) | |
5953 | and then (Base_Type (T2) = Base_Type (Standard_Integer) | |
b69cd36a | 5954 | or else T2 = Universal_Integer) |
996ae0b0 RK |
5955 | then |
5956 | Add_One_Interp (N, Op_Id, T1); | |
5957 | ||
5958 | elsif T2 = Universal_Real | |
5959 | and then Base_Type (T1) = Base_Type (Standard_Integer) | |
5960 | and then Op_Name = Name_Op_Multiply | |
5961 | then | |
5962 | Add_One_Interp (N, Op_Id, Any_Fixed); | |
5963 | ||
5964 | elsif T1 = Universal_Real | |
5965 | and then Base_Type (T2) = Base_Type (Standard_Integer) | |
5966 | then | |
5967 | Add_One_Interp (N, Op_Id, Any_Fixed); | |
5968 | ||
5969 | elsif Is_Fixed_Point_Type (T2) | |
5970 | and then (Base_Type (T1) = Base_Type (Standard_Integer) | |
b69cd36a | 5971 | or else T1 = Universal_Integer) |
996ae0b0 RK |
5972 | and then Op_Name = Name_Op_Multiply |
5973 | then | |
5974 | Add_One_Interp (N, Op_Id, T2); | |
5975 | ||
5976 | elsif T1 = Universal_Real and then T2 = Universal_Integer then | |
5977 | Add_One_Interp (N, Op_Id, T1); | |
5978 | ||
5979 | elsif T2 = Universal_Real | |
5980 | and then T1 = Universal_Integer | |
5981 | and then Op_Name = Name_Op_Multiply | |
5982 | then | |
5983 | Add_One_Interp (N, Op_Id, T2); | |
5984 | end if; | |
5985 | ||
5986 | elsif Op_Name = Name_Op_Mod or else Op_Name = Name_Op_Rem then | |
5987 | ||
5988 | -- Note: The fixed-point operands case with Treat_Fixed_As_Integer | |
5989 | -- set does not require any special processing, since the Etype is | |
5990 | -- already set (case of operation constructed by Exp_Fixed). | |
5991 | ||
5992 | if Is_Integer_Type (T1) | |
b4592168 GD |
5993 | and then (Covers (T1 => T1, T2 => T2) |
5994 | or else | |
5995 | Covers (T1 => T2, T2 => T1)) | |
996ae0b0 RK |
5996 | then |
5997 | Add_One_Interp (N, Op_Id, Specific_Type (T1, T2)); | |
5998 | end if; | |
5999 | ||
6000 | elsif Op_Name = Name_Op_Expon then | |
996ae0b0 RK |
6001 | if Is_Numeric_Type (T1) |
6002 | and then not Is_Fixed_Point_Type (T1) | |
6003 | and then (Base_Type (T2) = Base_Type (Standard_Integer) | |
6004 | or else T2 = Universal_Integer) | |
6005 | then | |
6006 | Add_One_Interp (N, Op_Id, Base_Type (T1)); | |
6007 | end if; | |
6008 | ||
6009 | else pragma Assert (Nkind (N) in N_Op_Shift); | |
6010 | ||
6011 | -- If not one of the predefined operators, the node may be one | |
6012 | -- of the intrinsic functions. Its kind is always specific, and | |
6013 | -- we can use it directly, rather than the name of the operation. | |
6014 | ||
6015 | if Is_Integer_Type (T1) | |
6016 | and then (Base_Type (T2) = Base_Type (Standard_Integer) | |
6017 | or else T2 = Universal_Integer) | |
6018 | then | |
6019 | Add_One_Interp (N, Op_Id, Base_Type (T1)); | |
6020 | end if; | |
6021 | end if; | |
6022 | end Check_Arithmetic_Pair; | |
6023 | ||
6024 | ------------------------------- | |
6025 | -- Check_Misspelled_Selector -- | |
6026 | ------------------------------- | |
6027 | ||
6028 | procedure Check_Misspelled_Selector | |
6029 | (Prefix : Entity_Id; | |
6030 | Sel : Node_Id) | |
6031 | is | |
6032 | Max_Suggestions : constant := 2; | |
6033 | Nr_Of_Suggestions : Natural := 0; | |
6034 | ||
6035 | Suggestion_1 : Entity_Id := Empty; | |
6036 | Suggestion_2 : Entity_Id := Empty; | |
6037 | ||
6038 | Comp : Entity_Id; | |
6039 | ||
6040 | begin | |
8b4230c8 AC |
6041 | -- All the components of the prefix of selector Sel are matched against |
6042 | -- Sel and a count is maintained of possible misspellings. When at | |
a90bd866 | 6043 | -- the end of the analysis there are one or two (not more) possible |
8b4230c8 AC |
6044 | -- misspellings, these misspellings will be suggested as possible |
6045 | -- correction. | |
996ae0b0 | 6046 | |
4c46b835 AC |
6047 | if not (Is_Private_Type (Prefix) or else Is_Record_Type (Prefix)) then |
6048 | ||
996ae0b0 | 6049 | -- Concurrent types should be handled as well ??? |
4c46b835 | 6050 | |
996ae0b0 RK |
6051 | return; |
6052 | end if; | |
6053 | ||
d469eabe HK |
6054 | Comp := First_Entity (Prefix); |
6055 | while Nr_Of_Suggestions <= Max_Suggestions and then Present (Comp) loop | |
24e95966 | 6056 | if Is_Visible_Component (Comp, Sel) then |
d469eabe HK |
6057 | if Is_Bad_Spelling_Of (Chars (Comp), Chars (Sel)) then |
6058 | Nr_Of_Suggestions := Nr_Of_Suggestions + 1; | |
6059 | ||
6060 | case Nr_Of_Suggestions is | |
6061 | when 1 => Suggestion_1 := Comp; | |
6062 | when 2 => Suggestion_2 := Comp; | |
e49de265 | 6063 | when others => null; |
d469eabe | 6064 | end case; |
996ae0b0 | 6065 | end if; |
d469eabe | 6066 | end if; |
996ae0b0 | 6067 | |
d469eabe HK |
6068 | Comp := Next_Entity (Comp); |
6069 | end loop; | |
996ae0b0 | 6070 | |
d469eabe | 6071 | -- Report at most two suggestions |
996ae0b0 | 6072 | |
d469eabe | 6073 | if Nr_Of_Suggestions = 1 then |
4e7a4f6e | 6074 | Error_Msg_NE -- CODEFIX |
d469eabe | 6075 | ("\possible misspelling of&", Sel, Suggestion_1); |
996ae0b0 | 6076 | |
d469eabe HK |
6077 | elsif Nr_Of_Suggestions = 2 then |
6078 | Error_Msg_Node_2 := Suggestion_2; | |
4e7a4f6e | 6079 | Error_Msg_NE -- CODEFIX |
d469eabe HK |
6080 | ("\possible misspelling of& or&", Sel, Suggestion_1); |
6081 | end if; | |
996ae0b0 RK |
6082 | end Check_Misspelled_Selector; |
6083 | ||
6084 | ---------------------- | |
6085 | -- Defined_In_Scope -- | |
6086 | ---------------------- | |
6087 | ||
6088 | function Defined_In_Scope (T : Entity_Id; S : Entity_Id) return Boolean | |
6089 | is | |
6090 | S1 : constant Entity_Id := Scope (Base_Type (T)); | |
996ae0b0 RK |
6091 | begin |
6092 | return S1 = S | |
6093 | or else (S1 = System_Aux_Id and then S = Scope (S1)); | |
6094 | end Defined_In_Scope; | |
6095 | ||
6096 | ------------------- | |
6097 | -- Diagnose_Call -- | |
6098 | ------------------- | |
6099 | ||
6100 | procedure Diagnose_Call (N : Node_Id; Nam : Node_Id) is | |
fbf5a39b AC |
6101 | Actual : Node_Id; |
6102 | X : Interp_Index; | |
6103 | It : Interp; | |
fbf5a39b AC |
6104 | Err_Mode : Boolean; |
6105 | New_Nam : Node_Id; | |
6106 | Void_Interp_Seen : Boolean := False; | |
996ae0b0 | 6107 | |
24657705 HK |
6108 | Success : Boolean; |
6109 | pragma Warnings (Off, Boolean); | |
6110 | ||
996ae0b0 | 6111 | begin |
0791fbe9 | 6112 | if Ada_Version >= Ada_2005 then |
996ae0b0 | 6113 | Actual := First_Actual (N); |
996ae0b0 | 6114 | while Present (Actual) loop |
0ab80019 AC |
6115 | |
6116 | -- Ada 2005 (AI-50217): Post an error in case of premature | |
6117 | -- usage of an entity from the limited view. | |
19f0526a | 6118 | |
996ae0b0 | 6119 | if not Analyzed (Etype (Actual)) |
7b56a91b | 6120 | and then From_Limited_With (Etype (Actual)) |
996ae0b0 RK |
6121 | then |
6122 | Error_Msg_Qual_Level := 1; | |
ed2233dc | 6123 | Error_Msg_NE |
996ae0b0 RK |
6124 | ("missing with_clause for scope of imported type&", |
6125 | Actual, Etype (Actual)); | |
6126 | Error_Msg_Qual_Level := 0; | |
6127 | end if; | |
6128 | ||
6129 | Next_Actual (Actual); | |
6130 | end loop; | |
6131 | end if; | |
6132 | ||
c63a2ad6 AC |
6133 | -- Before listing the possible candidates, check whether this is |
6134 | -- a prefix of a selected component that has been rewritten as a | |
6135 | -- parameterless function call because there is a callable candidate | |
6136 | -- interpretation. If there is a hidden package in the list of homonyms | |
6137 | -- of the function name (bad programming style in any case) suggest that | |
6138 | -- this is the intended entity. | |
40bf00b1 AC |
6139 | |
6140 | if No (Parameter_Associations (N)) | |
6141 | and then Nkind (Parent (N)) = N_Selected_Component | |
6142 | and then Nkind (Parent (Parent (N))) in N_Declaration | |
6143 | and then Is_Overloaded (Nam) | |
6144 | then | |
6145 | declare | |
6146 | Ent : Entity_Id; | |
6147 | ||
6148 | begin | |
6149 | Ent := Current_Entity (Nam); | |
6150 | while Present (Ent) loop | |
6151 | if Ekind (Ent) = E_Package then | |
6152 | Error_Msg_N | |
6153 | ("no legal interpretations as function call,!", Nam); | |
6154 | Error_Msg_NE ("\package& is not visible", N, Ent); | |
c63a2ad6 | 6155 | |
40bf00b1 AC |
6156 | Rewrite (Parent (N), |
6157 | New_Occurrence_Of (Any_Type, Sloc (N))); | |
6158 | return; | |
6159 | end if; | |
6160 | ||
6161 | Ent := Homonym (Ent); | |
6162 | end loop; | |
6163 | end; | |
6164 | end if; | |
6165 | ||
c63a2ad6 AC |
6166 | -- Analyze each candidate call again, with full error reporting for |
6167 | -- each. | |
fbf5a39b AC |
6168 | |
6169 | Error_Msg_N | |
6170 | ("no candidate interpretations match the actuals:!", Nam); | |
6171 | Err_Mode := All_Errors_Mode; | |
6172 | All_Errors_Mode := True; | |
6173 | ||
6174 | -- If this is a call to an operation of a concurrent type, | |
6175 | -- the failed interpretations have been removed from the | |
6176 | -- name. Recover them to provide full diagnostics. | |
6177 | ||
6178 | if Nkind (Parent (Nam)) = N_Selected_Component then | |
6179 | Set_Entity (Nam, Empty); | |
6180 | New_Nam := New_Copy_Tree (Parent (Nam)); | |
6181 | Set_Is_Overloaded (New_Nam, False); | |
6182 | Set_Is_Overloaded (Selector_Name (New_Nam), False); | |
6183 | Set_Parent (New_Nam, Parent (Parent (Nam))); | |
6184 | Analyze_Selected_Component (New_Nam); | |
6185 | Get_First_Interp (Selector_Name (New_Nam), X, It); | |
6186 | else | |
996ae0b0 | 6187 | Get_First_Interp (Nam, X, It); |
fbf5a39b | 6188 | end if; |
996ae0b0 | 6189 | |
fbf5a39b AC |
6190 | while Present (It.Nam) loop |
6191 | if Etype (It.Nam) = Standard_Void_Type then | |
6192 | Void_Interp_Seen := True; | |
996ae0b0 | 6193 | end if; |
fbf5a39b AC |
6194 | |
6195 | Analyze_One_Call (N, It.Nam, True, Success); | |
6196 | Get_Next_Interp (X, It); | |
6197 | end loop; | |
996ae0b0 RK |
6198 | |
6199 | if Nkind (N) = N_Function_Call then | |
6200 | Get_First_Interp (Nam, X, It); | |
996ae0b0 | 6201 | |
a9e47028 ES |
6202 | if No (It.Typ) |
6203 | and then Ekind (Entity (Name (N))) = E_Function | |
6204 | and then Present (Homonym (Entity (Name (N)))) | |
6205 | then | |
7f8c1cd3 HK |
6206 | -- A name may appear overloaded if it has a homonym, even if that |
6207 | -- homonym is non-overloadable, in which case the overload list is | |
6208 | -- in fact empty. This specialized case deserves a special message | |
6209 | -- if the homonym is a child package. | |
996ae0b0 | 6210 | |
a9e47028 ES |
6211 | declare |
6212 | Nam : constant Node_Id := Name (N); | |
6213 | H : constant Entity_Id := Homonym (Entity (Nam)); | |
6214 | ||
6215 | begin | |
7f8c1cd3 | 6216 | if Ekind (H) = E_Package and then Is_Child_Unit (H) then |
a9e47028 ES |
6217 | Error_Msg_Qual_Level := 2; |
6218 | Error_Msg_NE ("if an entity in package& is meant, ", Nam, H); | |
6219 | Error_Msg_NE ("\use a fully qualified name", Nam, H); | |
6220 | Error_Msg_Qual_Level := 0; | |
6221 | end if; | |
6222 | end; | |
6223 | ||
6224 | else | |
6225 | while Present (It.Nam) loop | |
6226 | if Ekind_In (It.Nam, E_Function, E_Operator) then | |
6227 | return; | |
6228 | else | |
6229 | Get_Next_Interp (X, It); | |
6230 | end if; | |
6231 | end loop; | |
6232 | ||
7f8c1cd3 HK |
6233 | -- If all interpretations are procedures, this deserves a more |
6234 | -- precise message. Ditto if this appears as the prefix of a | |
6235 | -- selected component, which may be a lexical error. | |
a9e47028 ES |
6236 | |
6237 | Error_Msg_N | |
6238 | ("\context requires function call, found procedure name", Nam); | |
6239 | ||
6240 | if Nkind (Parent (N)) = N_Selected_Component | |
6241 | and then N = Prefix (Parent (N)) | |
6242 | then | |
6243 | Error_Msg_N -- CODEFIX | |
6244 | ("\period should probably be semicolon", Parent (N)); | |
6245 | end if; | |
996ae0b0 | 6246 | end if; |
fbf5a39b AC |
6247 | |
6248 | elsif Nkind (N) = N_Procedure_Call_Statement | |
6249 | and then not Void_Interp_Seen | |
6250 | then | |
7f8c1cd3 | 6251 | Error_Msg_N ("\function name found in procedure call", Nam); |
996ae0b0 | 6252 | end if; |
fbf5a39b AC |
6253 | |
6254 | All_Errors_Mode := Err_Mode; | |
996ae0b0 RK |
6255 | end Diagnose_Call; |
6256 | ||
6257 | --------------------------- | |
6258 | -- Find_Arithmetic_Types -- | |
6259 | --------------------------- | |
6260 | ||
6261 | procedure Find_Arithmetic_Types | |
6262 | (L, R : Node_Id; | |
6263 | Op_Id : Entity_Id; | |
6264 | N : Node_Id) | |
6265 | is | |
4c46b835 AC |
6266 | Index1 : Interp_Index; |
6267 | Index2 : Interp_Index; | |
6268 | It1 : Interp; | |
6269 | It2 : Interp; | |
996ae0b0 RK |
6270 | |
6271 | procedure Check_Right_Argument (T : Entity_Id); | |
6272 | -- Check right operand of operator | |
6273 | ||
4c46b835 AC |
6274 | -------------------------- |
6275 | -- Check_Right_Argument -- | |
6276 | -------------------------- | |
6277 | ||
996ae0b0 RK |
6278 | procedure Check_Right_Argument (T : Entity_Id) is |
6279 | begin | |
6280 | if not Is_Overloaded (R) then | |
6281 | Check_Arithmetic_Pair (T, Etype (R), Op_Id, N); | |
6282 | else | |
6283 | Get_First_Interp (R, Index2, It2); | |
996ae0b0 RK |
6284 | while Present (It2.Typ) loop |
6285 | Check_Arithmetic_Pair (T, It2.Typ, Op_Id, N); | |
6286 | Get_Next_Interp (Index2, It2); | |
6287 | end loop; | |
6288 | end if; | |
6289 | end Check_Right_Argument; | |
6290 | ||
d8221f45 | 6291 | -- Start of processing for Find_Arithmetic_Types |
996ae0b0 RK |
6292 | |
6293 | begin | |
6294 | if not Is_Overloaded (L) then | |
6295 | Check_Right_Argument (Etype (L)); | |
6296 | ||
6297 | else | |
6298 | Get_First_Interp (L, Index1, It1); | |
996ae0b0 RK |
6299 | while Present (It1.Typ) loop |
6300 | Check_Right_Argument (It1.Typ); | |
6301 | Get_Next_Interp (Index1, It1); | |
6302 | end loop; | |
6303 | end if; | |
6304 | ||
6305 | end Find_Arithmetic_Types; | |
6306 | ||
6307 | ------------------------ | |
6308 | -- Find_Boolean_Types -- | |
6309 | ------------------------ | |
6310 | ||
6311 | procedure Find_Boolean_Types | |
6312 | (L, R : Node_Id; | |
6313 | Op_Id : Entity_Id; | |
6314 | N : Node_Id) | |
6315 | is | |
6316 | Index : Interp_Index; | |
6317 | It : Interp; | |
6318 | ||
6319 | procedure Check_Numeric_Argument (T : Entity_Id); | |
6320 | -- Special case for logical operations one of whose operands is an | |
6321 | -- integer literal. If both are literal the result is any modular type. | |
6322 | ||
4c46b835 AC |
6323 | ---------------------------- |
6324 | -- Check_Numeric_Argument -- | |
6325 | ---------------------------- | |
6326 | ||
996ae0b0 RK |
6327 | procedure Check_Numeric_Argument (T : Entity_Id) is |
6328 | begin | |
6329 | if T = Universal_Integer then | |
6330 | Add_One_Interp (N, Op_Id, Any_Modular); | |
6331 | ||
6332 | elsif Is_Modular_Integer_Type (T) then | |
6333 | Add_One_Interp (N, Op_Id, T); | |
6334 | end if; | |
6335 | end Check_Numeric_Argument; | |
6336 | ||
6337 | -- Start of processing for Find_Boolean_Types | |
6338 | ||
6339 | begin | |
6340 | if not Is_Overloaded (L) then | |
996ae0b0 RK |
6341 | if Etype (L) = Universal_Integer |
6342 | or else Etype (L) = Any_Modular | |
6343 | then | |
6344 | if not Is_Overloaded (R) then | |
6345 | Check_Numeric_Argument (Etype (R)); | |
6346 | ||
6347 | else | |
6348 | Get_First_Interp (R, Index, It); | |
996ae0b0 RK |
6349 | while Present (It.Typ) loop |
6350 | Check_Numeric_Argument (It.Typ); | |
996ae0b0 RK |
6351 | Get_Next_Interp (Index, It); |
6352 | end loop; | |
6353 | end if; | |
6354 | ||
69e6a03e ES |
6355 | -- If operands are aggregates, we must assume that they may be |
6356 | -- boolean arrays, and leave disambiguation for the second pass. | |
6357 | -- If only one is an aggregate, verify that the other one has an | |
6358 | -- interpretation as a boolean array | |
6359 | ||
6360 | elsif Nkind (L) = N_Aggregate then | |
6361 | if Nkind (R) = N_Aggregate then | |
6362 | Add_One_Interp (N, Op_Id, Etype (L)); | |
6363 | ||
6364 | elsif not Is_Overloaded (R) then | |
6365 | if Valid_Boolean_Arg (Etype (R)) then | |
6366 | Add_One_Interp (N, Op_Id, Etype (R)); | |
6367 | end if; | |
6368 | ||
6369 | else | |
6370 | Get_First_Interp (R, Index, It); | |
6371 | while Present (It.Typ) loop | |
6372 | if Valid_Boolean_Arg (It.Typ) then | |
6373 | Add_One_Interp (N, Op_Id, It.Typ); | |
6374 | end if; | |
6375 | ||
6376 | Get_Next_Interp (Index, It); | |
6377 | end loop; | |
6378 | end if; | |
6379 | ||
996ae0b0 RK |
6380 | elsif Valid_Boolean_Arg (Etype (L)) |
6381 | and then Has_Compatible_Type (R, Etype (L)) | |
6382 | then | |
6383 | Add_One_Interp (N, Op_Id, Etype (L)); | |
6384 | end if; | |
6385 | ||
6386 | else | |
6387 | Get_First_Interp (L, Index, It); | |
996ae0b0 RK |
6388 | while Present (It.Typ) loop |
6389 | if Valid_Boolean_Arg (It.Typ) | |
6390 | and then Has_Compatible_Type (R, It.Typ) | |
6391 | then | |
6392 | Add_One_Interp (N, Op_Id, It.Typ); | |
6393 | end if; | |
6394 | ||
6395 | Get_Next_Interp (Index, It); | |
6396 | end loop; | |
6397 | end if; | |
6398 | end Find_Boolean_Types; | |
6399 | ||
6400 | --------------------------- | |
6401 | -- Find_Comparison_Types -- | |
6402 | --------------------------- | |
6403 | ||
6404 | procedure Find_Comparison_Types | |
6405 | (L, R : Node_Id; | |
6406 | Op_Id : Entity_Id; | |
6407 | N : Node_Id) | |
6408 | is | |
6409 | Index : Interp_Index; | |
6410 | It : Interp; | |
6411 | Found : Boolean := False; | |
6412 | I_F : Interp_Index; | |
6413 | T_F : Entity_Id; | |
6414 | Scop : Entity_Id := Empty; | |
6415 | ||
6416 | procedure Try_One_Interp (T1 : Entity_Id); | |
6417 | -- Routine to try one proposed interpretation. Note that the context | |
6418 | -- of the operator plays no role in resolving the arguments, so that | |
6419 | -- if there is more than one interpretation of the operands that is | |
6420 | -- compatible with comparison, the operation is ambiguous. | |
6421 | ||
4c46b835 AC |
6422 | -------------------- |
6423 | -- Try_One_Interp -- | |
6424 | -------------------- | |
6425 | ||
996ae0b0 RK |
6426 | procedure Try_One_Interp (T1 : Entity_Id) is |
6427 | begin | |
996ae0b0 RK |
6428 | -- If the operator is an expanded name, then the type of the operand |
6429 | -- must be defined in the corresponding scope. If the type is | |
c468e1fb AC |
6430 | -- universal, the context will impose the correct type. Note that we |
6431 | -- also avoid returning if we are currently within a generic instance | |
6432 | -- due to the fact that the generic package declaration has already | |
6433 | -- been successfully analyzed and Defined_In_Scope expects the base | |
6434 | -- type to be defined within the instance which will never be the | |
6435 | -- case. | |
996ae0b0 RK |
6436 | |
6437 | if Present (Scop) | |
8b4230c8 | 6438 | and then not Defined_In_Scope (T1, Scop) |
c468e1fb | 6439 | and then not In_Instance |
8b4230c8 AC |
6440 | and then T1 /= Universal_Integer |
6441 | and then T1 /= Universal_Real | |
6442 | and then T1 /= Any_String | |
6443 | and then T1 /= Any_Composite | |
996ae0b0 RK |
6444 | then |
6445 | return; | |
6446 | end if; | |
6447 | ||
8b4230c8 AC |
6448 | if Valid_Comparison_Arg (T1) and then Has_Compatible_Type (R, T1) then |
6449 | if Found and then Base_Type (T1) /= Base_Type (T_F) then | |
996ae0b0 RK |
6450 | It := Disambiguate (L, I_F, Index, Any_Type); |
6451 | ||
6452 | if It = No_Interp then | |
6453 | Ambiguous_Operands (N); | |
6454 | Set_Etype (L, Any_Type); | |
6455 | return; | |
6456 | ||
6457 | else | |
6458 | T_F := It.Typ; | |
6459 | end if; | |
996ae0b0 RK |
6460 | else |
6461 | Found := True; | |
6462 | T_F := T1; | |
6463 | I_F := Index; | |
6464 | end if; | |
6465 | ||
6466 | Set_Etype (L, T_F); | |
6467 | Find_Non_Universal_Interpretations (N, R, Op_Id, T1); | |
996ae0b0 RK |
6468 | end if; |
6469 | end Try_One_Interp; | |
6470 | ||
d8221f45 | 6471 | -- Start of processing for Find_Comparison_Types |
996ae0b0 RK |
6472 | |
6473 | begin | |
fbf5a39b AC |
6474 | -- If left operand is aggregate, the right operand has to |
6475 | -- provide a usable type for it. | |
6476 | ||
8b4230c8 | 6477 | if Nkind (L) = N_Aggregate and then Nkind (R) /= N_Aggregate then |
b4592168 | 6478 | Find_Comparison_Types (L => R, R => L, Op_Id => Op_Id, N => N); |
fbf5a39b AC |
6479 | return; |
6480 | end if; | |
996ae0b0 RK |
6481 | |
6482 | if Nkind (N) = N_Function_Call | |
6483 | and then Nkind (Name (N)) = N_Expanded_Name | |
6484 | then | |
6485 | Scop := Entity (Prefix (Name (N))); | |
6486 | ||
6487 | -- The prefix may be a package renaming, and the subsequent test | |
6488 | -- requires the original package. | |
6489 | ||
6490 | if Ekind (Scop) = E_Package | |
6491 | and then Present (Renamed_Entity (Scop)) | |
6492 | then | |
6493 | Scop := Renamed_Entity (Scop); | |
6494 | Set_Entity (Prefix (Name (N)), Scop); | |
6495 | end if; | |
6496 | end if; | |
6497 | ||
6498 | if not Is_Overloaded (L) then | |
6499 | Try_One_Interp (Etype (L)); | |
6500 | ||
6501 | else | |
6502 | Get_First_Interp (L, Index, It); | |
996ae0b0 RK |
6503 | while Present (It.Typ) loop |
6504 | Try_One_Interp (It.Typ); | |
6505 | Get_Next_Interp (Index, It); | |
6506 | end loop; | |
6507 | end if; | |
6508 | end Find_Comparison_Types; | |
6509 | ||
6510 | ---------------------------------------- | |
6511 | -- Find_Non_Universal_Interpretations -- | |
6512 | ---------------------------------------- | |
6513 | ||
6514 | procedure Find_Non_Universal_Interpretations | |
6515 | (N : Node_Id; | |
6516 | R : Node_Id; | |
6517 | Op_Id : Entity_Id; | |
6518 | T1 : Entity_Id) | |
6519 | is | |
6520 | Index : Interp_Index; | |
4c46b835 | 6521 | It : Interp; |
996ae0b0 RK |
6522 | |
6523 | begin | |
8b4230c8 | 6524 | if T1 = Universal_Integer or else T1 = Universal_Real |
b9daa96e AC |
6525 | |
6526 | -- If the left operand of an equality operator is null, the visibility | |
6527 | -- of the operator must be determined from the interpretation of the | |
6528 | -- right operand. This processing must be done for Any_Access, which | |
6529 | -- is the internal representation of the type of the literal null. | |
6530 | ||
be4c5193 | 6531 | or else T1 = Any_Access |
996ae0b0 RK |
6532 | then |
6533 | if not Is_Overloaded (R) then | |
8b4230c8 | 6534 | Add_One_Interp (N, Op_Id, Standard_Boolean, Base_Type (Etype (R))); |
996ae0b0 RK |
6535 | else |
6536 | Get_First_Interp (R, Index, It); | |
996ae0b0 RK |
6537 | while Present (It.Typ) loop |
6538 | if Covers (It.Typ, T1) then | |
6539 | Add_One_Interp | |
6540 | (N, Op_Id, Standard_Boolean, Base_Type (It.Typ)); | |
6541 | end if; | |
6542 | ||
6543 | Get_Next_Interp (Index, It); | |
6544 | end loop; | |
6545 | end if; | |
6546 | else | |
6547 | Add_One_Interp (N, Op_Id, Standard_Boolean, Base_Type (T1)); | |
6548 | end if; | |
6549 | end Find_Non_Universal_Interpretations; | |
6550 | ||
6551 | ------------------------------ | |
6552 | -- Find_Concatenation_Types -- | |
6553 | ------------------------------ | |
6554 | ||
6555 | procedure Find_Concatenation_Types | |
6556 | (L, R : Node_Id; | |
6557 | Op_Id : Entity_Id; | |
6558 | N : Node_Id) | |
6559 | is | |
e201023c PMR |
6560 | Is_String : constant Boolean := Nkind (L) = N_String_Literal |
6561 | or else | |
6562 | Nkind (R) = N_String_Literal; | |
6563 | Op_Type : constant Entity_Id := Etype (Op_Id); | |
996ae0b0 RK |
6564 | |
6565 | begin | |
6566 | if Is_Array_Type (Op_Type) | |
e201023c PMR |
6567 | |
6568 | -- Small but very effective optimization: if at least one operand is a | |
6569 | -- string literal, then the type of the operator must be either array | |
6570 | -- of characters or array of strings. | |
6571 | ||
6572 | and then (not Is_String | |
6573 | or else | |
6574 | Is_Character_Type (Component_Type (Op_Type)) | |
6575 | or else | |
6576 | Is_String_Type (Component_Type (Op_Type))) | |
6577 | ||
996ae0b0 RK |
6578 | and then not Is_Limited_Type (Op_Type) |
6579 | ||
6580 | and then (Has_Compatible_Type (L, Op_Type) | |
6581 | or else | |
6582 | Has_Compatible_Type (L, Component_Type (Op_Type))) | |
6583 | ||
6584 | and then (Has_Compatible_Type (R, Op_Type) | |
6585 | or else | |
6586 | Has_Compatible_Type (R, Component_Type (Op_Type))) | |
6587 | then | |
6588 | Add_One_Interp (N, Op_Id, Op_Type); | |
6589 | end if; | |
6590 | end Find_Concatenation_Types; | |
6591 | ||
6592 | ------------------------- | |
6593 | -- Find_Equality_Types -- | |
6594 | ------------------------- | |
6595 | ||
6596 | procedure Find_Equality_Types | |
6597 | (L, R : Node_Id; | |
6598 | Op_Id : Entity_Id; | |
6599 | N : Node_Id) | |
6600 | is | |
6601 | Index : Interp_Index; | |
6602 | It : Interp; | |
6603 | Found : Boolean := False; | |
6604 | I_F : Interp_Index; | |
6605 | T_F : Entity_Id; | |
6606 | Scop : Entity_Id := Empty; | |
6607 | ||
6608 | procedure Try_One_Interp (T1 : Entity_Id); | |
a8e65aa5 AC |
6609 | -- The context of the equality operator plays no role in resolving the |
6610 | -- arguments, so that if there is more than one interpretation of the | |
6611 | -- operands that is compatible with equality, the construct is ambiguous | |
6612 | -- and an error can be emitted now, after trying to disambiguate, i.e. | |
6613 | -- applying preference rules. | |
996ae0b0 | 6614 | |
4c46b835 AC |
6615 | -------------------- |
6616 | -- Try_One_Interp -- | |
6617 | -------------------- | |
6618 | ||
996ae0b0 | 6619 | procedure Try_One_Interp (T1 : Entity_Id) is |
851e9f19 | 6620 | Bas : Entity_Id; |
a8e65aa5 | 6621 | |
996ae0b0 | 6622 | begin |
851e9f19 PMR |
6623 | -- Perform a sanity check in case of previous errors |
6624 | ||
6625 | if No (T1) then | |
6626 | return; | |
6627 | end if; | |
6628 | ||
6629 | Bas := Base_Type (T1); | |
6630 | ||
996ae0b0 RK |
6631 | -- If the operator is an expanded name, then the type of the operand |
6632 | -- must be defined in the corresponding scope. If the type is | |
6633 | -- universal, the context will impose the correct type. An anonymous | |
6634 | -- type for a 'Access reference is also universal in this sense, as | |
6635 | -- the actual type is obtained from context. | |
8b4230c8 | 6636 | |
fe45e59e ES |
6637 | -- In Ada 2005, the equality operator for anonymous access types |
6638 | -- is declared in Standard, and preference rules apply to it. | |
996ae0b0 | 6639 | |
fe45e59e | 6640 | if Present (Scop) then |
c468e1fb AC |
6641 | |
6642 | -- Note that we avoid returning if we are currently within a | |
6643 | -- generic instance due to the fact that the generic package | |
6644 | -- declaration has already been successfully analyzed and | |
4ac62786 AC |
6645 | -- Defined_In_Scope expects the base type to be defined within |
6646 | -- the instance which will never be the case. | |
c468e1fb | 6647 | |
fe45e59e | 6648 | if Defined_In_Scope (T1, Scop) |
c468e1fb | 6649 | or else In_Instance |
fe45e59e ES |
6650 | or else T1 = Universal_Integer |
6651 | or else T1 = Universal_Real | |
6652 | or else T1 = Any_Access | |
6653 | or else T1 = Any_String | |
6654 | or else T1 = Any_Composite | |
6655 | or else (Ekind (T1) = E_Access_Subprogram_Type | |
a8e65aa5 | 6656 | and then not Comes_From_Source (T1)) |
fe45e59e ES |
6657 | then |
6658 | null; | |
6659 | ||
6660 | elsif Ekind (T1) = E_Anonymous_Access_Type | |
6661 | and then Scop = Standard_Standard | |
6662 | then | |
6663 | null; | |
6664 | ||
6665 | else | |
6666 | -- The scope does not contain an operator for the type | |
6667 | ||
6668 | return; | |
6669 | end if; | |
a8e65aa5 | 6670 | |
9aa04cc7 AC |
6671 | -- If we have infix notation, the operator must be usable. Within |
6672 | -- an instance, if the type is already established we know it is | |
6673 | -- correct. If an operand is universal it is compatible with any | |
6674 | -- numeric type. | |
31af8899 | 6675 | |
a8e65aa5 AC |
6676 | elsif In_Open_Scopes (Scope (Bas)) |
6677 | or else Is_Potentially_Use_Visible (Bas) | |
6678 | or else In_Use (Bas) | |
9aa04cc7 | 6679 | or else (In_Use (Scope (Bas)) and then not Is_Hidden (Bas)) |
a54ffd6c AC |
6680 | |
6681 | -- In an instance, the type may have been immediately visible. | |
6682 | -- Either the types are compatible, or one operand is universal | |
6683 | -- (numeric or null). | |
6684 | ||
c5b4738f AC |
6685 | or else |
6686 | ((In_Instance or else In_Inlined_Body) | |
6687 | and then | |
6688 | (First_Subtype (T1) = First_Subtype (Etype (R)) | |
6689 | or else Nkind (R) = N_Null | |
6690 | or else | |
6691 | (Is_Numeric_Type (T1) | |
6692 | and then Is_Universal_Numeric_Type (Etype (R))))) | |
a54ffd6c AC |
6693 | |
6694 | -- In Ada 2005, the equality on anonymous access types is declared | |
6695 | -- in Standard, and is always visible. | |
6696 | ||
a8e65aa5 AC |
6697 | or else Ekind (T1) = E_Anonymous_Access_Type |
6698 | then | |
6699 | null; | |
6700 | ||
6701 | else | |
308e6f3a | 6702 | -- Save candidate type for subsequent error message, if any |
a8e65aa5 AC |
6703 | |
6704 | if not Is_Limited_Type (T1) then | |
6705 | Candidate_Type := T1; | |
6706 | end if; | |
6707 | ||
6708 | return; | |
996ae0b0 RK |
6709 | end if; |
6710 | ||
0ab80019 AC |
6711 | -- Ada 2005 (AI-230): Keep restriction imposed by Ada 83 and 95: |
6712 | -- Do not allow anonymous access types in equality operators. | |
6e937c1c | 6713 | |
0791fbe9 | 6714 | if Ada_Version < Ada_2005 |
6e937c1c AC |
6715 | and then Ekind (T1) = E_Anonymous_Access_Type |
6716 | then | |
6717 | return; | |
6718 | end if; | |
6719 | ||
c92e8586 AC |
6720 | -- If the right operand has a type compatible with T1, check for an |
6721 | -- acceptable interpretation, unless T1 is limited (no predefined | |
6722 | -- equality available), or this is use of a "/=" for a tagged type. | |
8b4230c8 AC |
6723 | -- In the latter case, possible interpretations of equality need |
6724 | -- to be considered, we don't want the default inequality declared | |
6725 | -- in Standard to be chosen, and the "/=" will be rewritten as a | |
c92e8586 | 6726 | -- negation of "=" (see the end of Analyze_Equality_Op). This ensures |
026c3cfd | 6727 | -- that rewriting happens during analysis rather than being |
c92e8586 AC |
6728 | -- delayed until expansion (this is needed for ASIS, which only sees |
6729 | -- the unexpanded tree). Note that if the node is N_Op_Ne, but Op_Id | |
6730 | -- is Name_Op_Eq then we still proceed with the interpretation, | |
6731 | -- because that indicates the potential rewriting case where the | |
6732 | -- interpretation to consider is actually "=" and the node may be | |
6733 | -- about to be rewritten by Analyze_Equality_Op. | |
6734 | ||
996ae0b0 | 6735 | if T1 /= Standard_Void_Type |
996ae0b0 | 6736 | and then Has_Compatible_Type (R, T1) |
c92e8586 | 6737 | |
9b62eb32 AC |
6738 | and then |
6739 | ((not Is_Limited_Type (T1) | |
6740 | and then not Is_Limited_Composite (T1)) | |
6741 | ||
6742 | or else | |
2fcc44fa | 6743 | (Is_Array_Type (T1) |
9b62eb32 AC |
6744 | and then not Is_Limited_Type (Component_Type (T1)) |
6745 | and then Available_Full_View_Of_Component (T1))) | |
c92e8586 AC |
6746 | |
6747 | and then | |
6748 | (Nkind (N) /= N_Op_Ne | |
6749 | or else not Is_Tagged_Type (T1) | |
6750 | or else Chars (Op_Id) = Name_Op_Eq) | |
996ae0b0 RK |
6751 | then |
6752 | if Found | |
6753 | and then Base_Type (T1) /= Base_Type (T_F) | |
6754 | then | |
6755 | It := Disambiguate (L, I_F, Index, Any_Type); | |
6756 | ||
6757 | if It = No_Interp then | |
6758 | Ambiguous_Operands (N); | |
6759 | Set_Etype (L, Any_Type); | |
6760 | return; | |
6761 | ||
6762 | else | |
6763 | T_F := It.Typ; | |
6764 | end if; | |
6765 | ||
6766 | else | |
6767 | Found := True; | |
6768 | T_F := T1; | |
6769 | I_F := Index; | |
6770 | end if; | |
6771 | ||
6772 | if not Analyzed (L) then | |
6773 | Set_Etype (L, T_F); | |
6774 | end if; | |
6775 | ||
6776 | Find_Non_Universal_Interpretations (N, R, Op_Id, T1); | |
6777 | ||
6e73e3ab | 6778 | -- Case of operator was not visible, Etype still set to Any_Type |
996ae0b0 | 6779 | |
6e73e3ab | 6780 | if Etype (N) = Any_Type then |
996ae0b0 RK |
6781 | Found := False; |
6782 | end if; | |
fe45e59e ES |
6783 | |
6784 | elsif Scop = Standard_Standard | |
6785 | and then Ekind (T1) = E_Anonymous_Access_Type | |
6786 | then | |
6787 | Found := True; | |
996ae0b0 RK |
6788 | end if; |
6789 | end Try_One_Interp; | |
6790 | ||
6791 | -- Start of processing for Find_Equality_Types | |
6792 | ||
6793 | begin | |
fbf5a39b AC |
6794 | -- If left operand is aggregate, the right operand has to |
6795 | -- provide a usable type for it. | |
6796 | ||
6797 | if Nkind (L) = N_Aggregate | |
6798 | and then Nkind (R) /= N_Aggregate | |
6799 | then | |
b4592168 | 6800 | Find_Equality_Types (L => R, R => L, Op_Id => Op_Id, N => N); |
fbf5a39b AC |
6801 | return; |
6802 | end if; | |
996ae0b0 RK |
6803 | |
6804 | if Nkind (N) = N_Function_Call | |
6805 | and then Nkind (Name (N)) = N_Expanded_Name | |
6806 | then | |
6807 | Scop := Entity (Prefix (Name (N))); | |
6808 | ||
6809 | -- The prefix may be a package renaming, and the subsequent test | |
6810 | -- requires the original package. | |
6811 | ||
6812 | if Ekind (Scop) = E_Package | |
6813 | and then Present (Renamed_Entity (Scop)) | |
6814 | then | |
6815 | Scop := Renamed_Entity (Scop); | |
6816 | Set_Entity (Prefix (Name (N)), Scop); | |
6817 | end if; | |
6818 | end if; | |
6819 | ||
6820 | if not Is_Overloaded (L) then | |
6821 | Try_One_Interp (Etype (L)); | |
996ae0b0 | 6822 | |
4c46b835 | 6823 | else |
996ae0b0 | 6824 | Get_First_Interp (L, Index, It); |
996ae0b0 RK |
6825 | while Present (It.Typ) loop |
6826 | Try_One_Interp (It.Typ); | |
6827 | Get_Next_Interp (Index, It); | |
6828 | end loop; | |
6829 | end if; | |
6830 | end Find_Equality_Types; | |
6831 | ||
6832 | ------------------------- | |
6833 | -- Find_Negation_Types -- | |
6834 | ------------------------- | |
6835 | ||
6836 | procedure Find_Negation_Types | |
6837 | (R : Node_Id; | |
6838 | Op_Id : Entity_Id; | |
6839 | N : Node_Id) | |
6840 | is | |
6841 | Index : Interp_Index; | |
6842 | It : Interp; | |
6843 | ||
6844 | begin | |
6845 | if not Is_Overloaded (R) then | |
996ae0b0 RK |
6846 | if Etype (R) = Universal_Integer then |
6847 | Add_One_Interp (N, Op_Id, Any_Modular); | |
996ae0b0 RK |
6848 | elsif Valid_Boolean_Arg (Etype (R)) then |
6849 | Add_One_Interp (N, Op_Id, Etype (R)); | |
6850 | end if; | |
6851 | ||
6852 | else | |
6853 | Get_First_Interp (R, Index, It); | |
996ae0b0 RK |
6854 | while Present (It.Typ) loop |
6855 | if Valid_Boolean_Arg (It.Typ) then | |
6856 | Add_One_Interp (N, Op_Id, It.Typ); | |
6857 | end if; | |
6858 | ||
6859 | Get_Next_Interp (Index, It); | |
6860 | end loop; | |
6861 | end if; | |
6862 | end Find_Negation_Types; | |
6863 | ||
d469eabe HK |
6864 | ------------------------------ |
6865 | -- Find_Primitive_Operation -- | |
6866 | ------------------------------ | |
6867 | ||
6868 | function Find_Primitive_Operation (N : Node_Id) return Boolean is | |
6869 | Obj : constant Node_Id := Prefix (N); | |
6870 | Op : constant Node_Id := Selector_Name (N); | |
6871 | ||
6872 | Prim : Elmt_Id; | |
6873 | Prims : Elist_Id; | |
6874 | Typ : Entity_Id; | |
6875 | ||
6876 | begin | |
6877 | Set_Etype (Op, Any_Type); | |
6878 | ||
6879 | if Is_Access_Type (Etype (Obj)) then | |
6880 | Typ := Designated_Type (Etype (Obj)); | |
6881 | else | |
6882 | Typ := Etype (Obj); | |
6883 | end if; | |
6884 | ||
6885 | if Is_Class_Wide_Type (Typ) then | |
6886 | Typ := Root_Type (Typ); | |
6887 | end if; | |
6888 | ||
6889 | Prims := Primitive_Operations (Typ); | |
6890 | ||
6891 | Prim := First_Elmt (Prims); | |
6892 | while Present (Prim) loop | |
6893 | if Chars (Node (Prim)) = Chars (Op) then | |
6894 | Add_One_Interp (Op, Node (Prim), Etype (Node (Prim))); | |
6895 | Set_Etype (N, Etype (Node (Prim))); | |
6896 | end if; | |
6897 | ||
6898 | Next_Elmt (Prim); | |
6899 | end loop; | |
6900 | ||
6901 | -- Now look for class-wide operations of the type or any of its | |
6902 | -- ancestors by iterating over the homonyms of the selector. | |
6903 | ||
6904 | declare | |
6905 | Cls_Type : constant Entity_Id := Class_Wide_Type (Typ); | |
6906 | Hom : Entity_Id; | |
6907 | ||
6908 | begin | |
6909 | Hom := Current_Entity (Op); | |
6910 | while Present (Hom) loop | |
6911 | if (Ekind (Hom) = E_Procedure | |
6912 | or else | |
6913 | Ekind (Hom) = E_Function) | |
6914 | and then Scope (Hom) = Scope (Typ) | |
6915 | and then Present (First_Formal (Hom)) | |
6916 | and then | |
6917 | (Base_Type (Etype (First_Formal (Hom))) = Cls_Type | |
6918 | or else | |
6919 | (Is_Access_Type (Etype (First_Formal (Hom))) | |
8b4230c8 AC |
6920 | and then |
6921 | Ekind (Etype (First_Formal (Hom))) = | |
6922 | E_Anonymous_Access_Type | |
6923 | and then | |
6924 | Base_Type | |
6925 | (Designated_Type (Etype (First_Formal (Hom)))) = | |
d469eabe HK |
6926 | Cls_Type)) |
6927 | then | |
6928 | Add_One_Interp (Op, Hom, Etype (Hom)); | |
6929 | Set_Etype (N, Etype (Hom)); | |
6930 | end if; | |
6931 | ||
6932 | Hom := Homonym (Hom); | |
6933 | end loop; | |
6934 | end; | |
6935 | ||
6936 | return Etype (Op) /= Any_Type; | |
6937 | end Find_Primitive_Operation; | |
6938 | ||
996ae0b0 RK |
6939 | ---------------------- |
6940 | -- Find_Unary_Types -- | |
6941 | ---------------------- | |
6942 | ||
6943 | procedure Find_Unary_Types | |
6944 | (R : Node_Id; | |
6945 | Op_Id : Entity_Id; | |
6946 | N : Node_Id) | |
6947 | is | |
6948 | Index : Interp_Index; | |
6949 | It : Interp; | |
6950 | ||
6951 | begin | |
6952 | if not Is_Overloaded (R) then | |
6953 | if Is_Numeric_Type (Etype (R)) then | |
65f7ed64 AC |
6954 | |
6955 | -- In an instance a generic actual may be a numeric type even if | |
6956 | -- the formal in the generic unit was not. In that case, the | |
6957 | -- predefined operator was not a possible interpretation in the | |
2e70d415 AC |
6958 | -- generic, and cannot be one in the instance, unless the operator |
6959 | -- is an actual of an instance. | |
65f7ed64 AC |
6960 | |
6961 | if In_Instance | |
6962 | and then | |
6963 | not Is_Numeric_Type (Corresponding_Generic_Type (Etype (R))) | |
6964 | then | |
6965 | null; | |
6966 | else | |
6967 | Add_One_Interp (N, Op_Id, Base_Type (Etype (R))); | |
6968 | end if; | |
996ae0b0 RK |
6969 | end if; |
6970 | ||
6971 | else | |
6972 | Get_First_Interp (R, Index, It); | |
996ae0b0 RK |
6973 | while Present (It.Typ) loop |
6974 | if Is_Numeric_Type (It.Typ) then | |
65f7ed64 AC |
6975 | if In_Instance |
6976 | and then | |
6977 | not Is_Numeric_Type | |
6978 | (Corresponding_Generic_Type (Etype (It.Typ))) | |
6979 | then | |
6980 | null; | |
6981 | ||
6982 | else | |
6983 | Add_One_Interp (N, Op_Id, Base_Type (It.Typ)); | |
6984 | end if; | |
996ae0b0 RK |
6985 | end if; |
6986 | ||
6987 | Get_Next_Interp (Index, It); | |
6988 | end loop; | |
6989 | end if; | |
6990 | end Find_Unary_Types; | |
6991 | ||
996ae0b0 RK |
6992 | ------------------ |
6993 | -- Junk_Operand -- | |
6994 | ------------------ | |
6995 | ||
6996 | function Junk_Operand (N : Node_Id) return Boolean is | |
6997 | Enode : Node_Id; | |
6998 | ||
6999 | begin | |
7000 | if Error_Posted (N) then | |
7001 | return False; | |
7002 | end if; | |
7003 | ||
7004 | -- Get entity to be tested | |
7005 | ||
7006 | if Is_Entity_Name (N) | |
7007 | and then Present (Entity (N)) | |
7008 | then | |
7009 | Enode := N; | |
7010 | ||
7011 | -- An odd case, a procedure name gets converted to a very peculiar | |
7012 | -- function call, and here is where we detect this happening. | |
7013 | ||
7014 | elsif Nkind (N) = N_Function_Call | |
7015 | and then Is_Entity_Name (Name (N)) | |
7016 | and then Present (Entity (Name (N))) | |
7017 | then | |
7018 | Enode := Name (N); | |
7019 | ||
7020 | -- Another odd case, there are at least some cases of selected | |
7021 | -- components where the selected component is not marked as having | |
7022 | -- an entity, even though the selector does have an entity | |
7023 | ||
7024 | elsif Nkind (N) = N_Selected_Component | |
7025 | and then Present (Entity (Selector_Name (N))) | |
7026 | then | |
7027 | Enode := Selector_Name (N); | |
7028 | ||
7029 | else | |
7030 | return False; | |
7031 | end if; | |
7032 | ||
9de61fcb | 7033 | -- Now test the entity we got to see if it is a bad case |
996ae0b0 RK |
7034 | |
7035 | case Ekind (Entity (Enode)) is | |
996ae0b0 RK |
7036 | when E_Package => |
7037 | Error_Msg_N | |
7038 | ("package name cannot be used as operand", Enode); | |
7039 | ||
7040 | when Generic_Unit_Kind => | |
7041 | Error_Msg_N | |
7042 | ("generic unit name cannot be used as operand", Enode); | |
7043 | ||
7044 | when Type_Kind => | |
7045 | Error_Msg_N | |
7046 | ("subtype name cannot be used as operand", Enode); | |
7047 | ||
7048 | when Entry_Kind => | |
7049 | Error_Msg_N | |
7050 | ("entry name cannot be used as operand", Enode); | |
7051 | ||
7052 | when E_Procedure => | |
7053 | Error_Msg_N | |
7054 | ("procedure name cannot be used as operand", Enode); | |
7055 | ||
7056 | when E_Exception => | |
7057 | Error_Msg_N | |
7058 | ("exception name cannot be used as operand", Enode); | |
7059 | ||
d8f43ee6 HK |
7060 | when E_Block |
7061 | | E_Label | |
7062 | | E_Loop | |
7063 | => | |
996ae0b0 RK |
7064 | Error_Msg_N |
7065 | ("label name cannot be used as operand", Enode); | |
7066 | ||
7067 | when others => | |
7068 | return False; | |
996ae0b0 RK |
7069 | end case; |
7070 | ||
7071 | return True; | |
7072 | end Junk_Operand; | |
7073 | ||
7074 | -------------------- | |
7075 | -- Operator_Check -- | |
7076 | -------------------- | |
7077 | ||
7078 | procedure Operator_Check (N : Node_Id) is | |
7079 | begin | |
30c20106 AC |
7080 | Remove_Abstract_Operations (N); |
7081 | ||
996ae0b0 RK |
7082 | -- Test for case of no interpretation found for operator |
7083 | ||
7084 | if Etype (N) = Any_Type then | |
7085 | declare | |
b67a385c ES |
7086 | L : Node_Id; |
7087 | R : Node_Id; | |
7088 | Op_Id : Entity_Id := Empty; | |
996ae0b0 RK |
7089 | |
7090 | begin | |
7091 | R := Right_Opnd (N); | |
7092 | ||
7093 | if Nkind (N) in N_Binary_Op then | |
7094 | L := Left_Opnd (N); | |
7095 | else | |
7096 | L := Empty; | |
7097 | end if; | |
7098 | ||
7099 | -- If either operand has no type, then don't complain further, | |
9de61fcb | 7100 | -- since this simply means that we have a propagated error. |
996ae0b0 RK |
7101 | |
7102 | if R = Error | |
7103 | or else Etype (R) = Any_Type | |
7104 | or else (Nkind (N) in N_Binary_Op and then Etype (L) = Any_Type) | |
7105 | then | |
7610fee8 AC |
7106 | -- For the rather unusual case where one of the operands is |
7107 | -- a Raise_Expression, whose initial type is Any_Type, use | |
7108 | -- the type of the other operand. | |
7109 | ||
7110 | if Nkind (L) = N_Raise_Expression then | |
7111 | Set_Etype (L, Etype (R)); | |
7112 | Set_Etype (N, Etype (R)); | |
7113 | ||
7114 | elsif Nkind (R) = N_Raise_Expression then | |
7115 | Set_Etype (R, Etype (L)); | |
7116 | Set_Etype (N, Etype (L)); | |
7117 | end if; | |
7118 | ||
996ae0b0 RK |
7119 | return; |
7120 | ||
4c46b835 AC |
7121 | -- We explicitly check for the case of concatenation of component |
7122 | -- with component to avoid reporting spurious matching array types | |
7123 | -- that might happen to be lurking in distant packages (such as | |
7124 | -- run-time packages). This also prevents inconsistencies in the | |
7125 | -- messages for certain ACVC B tests, which can vary depending on | |
7126 | -- types declared in run-time interfaces. Another improvement when | |
7127 | -- aggregates are present is to look for a well-typed operand. | |
996ae0b0 RK |
7128 | |
7129 | elsif Present (Candidate_Type) | |
7130 | and then (Nkind (N) /= N_Op_Concat | |
7131 | or else Is_Array_Type (Etype (L)) | |
7132 | or else Is_Array_Type (Etype (R))) | |
7133 | then | |
996ae0b0 RK |
7134 | if Nkind (N) = N_Op_Concat then |
7135 | if Etype (L) /= Any_Composite | |
7136 | and then Is_Array_Type (Etype (L)) | |
7137 | then | |
7138 | Candidate_Type := Etype (L); | |
7139 | ||
7140 | elsif Etype (R) /= Any_Composite | |
7141 | and then Is_Array_Type (Etype (R)) | |
7142 | then | |
7143 | Candidate_Type := Etype (R); | |
7144 | end if; | |
7145 | end if; | |
7146 | ||
19d846a0 | 7147 | Error_Msg_NE -- CODEFIX |
996ae0b0 RK |
7148 | ("operator for} is not directly visible!", |
7149 | N, First_Subtype (Candidate_Type)); | |
4561baf7 ES |
7150 | |
7151 | declare | |
7152 | U : constant Node_Id := | |
7153 | Cunit (Get_Source_Unit (Candidate_Type)); | |
4561baf7 ES |
7154 | begin |
7155 | if Unit_Is_Visible (U) then | |
7156 | Error_Msg_N -- CODEFIX | |
7157 | ("use clause would make operation legal!", N); | |
4561baf7 ES |
7158 | else |
7159 | Error_Msg_NE -- CODEFIX | |
7160 | ("add with_clause and use_clause for&!", | |
8b4230c8 | 7161 | N, Defining_Entity (Unit (U))); |
4561baf7 ES |
7162 | end if; |
7163 | end; | |
996ae0b0 RK |
7164 | return; |
7165 | ||
7166 | -- If either operand is a junk operand (e.g. package name), then | |
7167 | -- post appropriate error messages, but do not complain further. | |
7168 | ||
0e0eecec ES |
7169 | -- Note that the use of OR in this test instead of OR ELSE is |
7170 | -- quite deliberate, we may as well check both operands in the | |
7171 | -- binary operator case. | |
996ae0b0 RK |
7172 | |
7173 | elsif Junk_Operand (R) | |
9559eccf AC |
7174 | or -- really mean OR here and not OR ELSE, see above |
7175 | (Nkind (N) in N_Binary_Op and then Junk_Operand (L)) | |
996ae0b0 RK |
7176 | then |
7177 | return; | |
7178 | ||
7179 | -- If we have a logical operator, one of whose operands is | |
0e0eecec ES |
7180 | -- Boolean, then we know that the other operand cannot resolve to |
7181 | -- Boolean (since we got no interpretations), but in that case we | |
7182 | -- pretty much know that the other operand should be Boolean, so | |
070d862d | 7183 | -- resolve it that way (generating an error). |
996ae0b0 | 7184 | |
d469eabe | 7185 | elsif Nkind_In (N, N_Op_And, N_Op_Or, N_Op_Xor) then |
996ae0b0 RK |
7186 | if Etype (L) = Standard_Boolean then |
7187 | Resolve (R, Standard_Boolean); | |
7188 | return; | |
7189 | elsif Etype (R) = Standard_Boolean then | |
7190 | Resolve (L, Standard_Boolean); | |
7191 | return; | |
7192 | end if; | |
7193 | ||
7194 | -- For an arithmetic operator or comparison operator, if one | |
7195 | -- of the operands is numeric, then we know the other operand | |
7196 | -- is not the same numeric type. If it is a non-numeric type, | |
7197 | -- then probably it is intended to match the other operand. | |
7198 | ||
d469eabe HK |
7199 | elsif Nkind_In (N, N_Op_Add, |
7200 | N_Op_Divide, | |
7201 | N_Op_Ge, | |
7202 | N_Op_Gt, | |
7203 | N_Op_Le) | |
7204 | or else | |
7205 | Nkind_In (N, N_Op_Lt, | |
7206 | N_Op_Mod, | |
7207 | N_Op_Multiply, | |
7208 | N_Op_Rem, | |
7209 | N_Op_Subtract) | |
996ae0b0 | 7210 | then |
7dbd3de9 RD |
7211 | -- If Allow_Integer_Address is active, check whether the |
7212 | -- operation becomes legal after converting an operand. | |
7213 | ||
996ae0b0 RK |
7214 | if Is_Numeric_Type (Etype (L)) |
7215 | and then not Is_Numeric_Type (Etype (R)) | |
7216 | then | |
7dbd3de9 RD |
7217 | if Address_Integer_Convert_OK (Etype (R), Etype (L)) then |
7218 | Rewrite (R, | |
7219 | Unchecked_Convert_To (Etype (L), Relocate_Node (R))); | |
7dbd3de9 | 7220 | |
1e3689bd AC |
7221 | if Nkind_In (N, N_Op_Ge, N_Op_Gt, N_Op_Le, N_Op_Lt) then |
7222 | Analyze_Comparison_Op (N); | |
7223 | else | |
7224 | Analyze_Arithmetic_Op (N); | |
7225 | end if; | |
7dbd3de9 RD |
7226 | else |
7227 | Resolve (R, Etype (L)); | |
7228 | end if; | |
1e3689bd | 7229 | |
996ae0b0 RK |
7230 | return; |
7231 | ||
7232 | elsif Is_Numeric_Type (Etype (R)) | |
7233 | and then not Is_Numeric_Type (Etype (L)) | |
7234 | then | |
7dbd3de9 RD |
7235 | if Address_Integer_Convert_OK (Etype (L), Etype (R)) then |
7236 | Rewrite (L, | |
7237 | Unchecked_Convert_To (Etype (R), Relocate_Node (L))); | |
1e3689bd AC |
7238 | |
7239 | if Nkind_In (N, N_Op_Ge, N_Op_Gt, N_Op_Le, N_Op_Lt) then | |
7240 | Analyze_Comparison_Op (N); | |
7241 | else | |
7242 | Analyze_Arithmetic_Op (N); | |
7243 | end if; | |
7244 | ||
9559eccf | 7245 | return; |
7dbd3de9 RD |
7246 | |
7247 | else | |
7248 | Resolve (L, Etype (R)); | |
7249 | end if; | |
9559eccf | 7250 | |
996ae0b0 | 7251 | return; |
9559eccf AC |
7252 | |
7253 | elsif Allow_Integer_Address | |
d9d25d04 AC |
7254 | and then Is_Descendant_Of_Address (Etype (L)) |
7255 | and then Is_Descendant_Of_Address (Etype (R)) | |
9559eccf AC |
7256 | and then not Error_Posted (N) |
7257 | then | |
7258 | declare | |
7259 | Addr_Type : constant Entity_Id := Etype (L); | |
7260 | ||
7261 | begin | |
7262 | Rewrite (L, | |
7263 | Unchecked_Convert_To ( | |
7264 | Standard_Integer, Relocate_Node (L))); | |
7265 | Rewrite (R, | |
7266 | Unchecked_Convert_To ( | |
7267 | Standard_Integer, Relocate_Node (R))); | |
1e3689bd AC |
7268 | |
7269 | if Nkind_In (N, N_Op_Ge, N_Op_Gt, N_Op_Le, N_Op_Lt) then | |
7270 | Analyze_Comparison_Op (N); | |
7271 | else | |
7272 | Analyze_Arithmetic_Op (N); | |
7273 | end if; | |
9559eccf AC |
7274 | |
7275 | -- If this is an operand in an enclosing arithmetic | |
7276 | -- operation, Convert the result as an address so that | |
7277 | -- arithmetic folding of address can continue. | |
7278 | ||
7279 | if Nkind (Parent (N)) in N_Op then | |
7280 | Rewrite (N, | |
7281 | Unchecked_Convert_To (Addr_Type, Relocate_Node (N))); | |
7282 | end if; | |
7283 | ||
7284 | return; | |
7285 | end; | |
a8a42b93 AC |
7286 | |
7287 | -- Under relaxed RM semantics silently replace occurrences of | |
7288 | -- null by System.Address_Null. | |
7289 | ||
7290 | elsif Null_To_Null_Address_Convert_OK (N) then | |
7291 | Replace_Null_By_Null_Address (N); | |
7292 | ||
7293 | if Nkind_In (N, N_Op_Ge, N_Op_Gt, N_Op_Le, N_Op_Lt) then | |
7294 | Analyze_Comparison_Op (N); | |
7295 | else | |
7296 | Analyze_Arithmetic_Op (N); | |
7297 | end if; | |
7298 | ||
7299 | return; | |
996ae0b0 RK |
7300 | end if; |
7301 | ||
7302 | -- Comparisons on A'Access are common enough to deserve a | |
7303 | -- special message. | |
7304 | ||
d469eabe | 7305 | elsif Nkind_In (N, N_Op_Eq, N_Op_Ne) |
996ae0b0 RK |
7306 | and then Ekind (Etype (L)) = E_Access_Attribute_Type |
7307 | and then Ekind (Etype (R)) = E_Access_Attribute_Type | |
7308 | then | |
7309 | Error_Msg_N | |
7310 | ("two access attributes cannot be compared directly", N); | |
7311 | Error_Msg_N | |
aab883ec | 7312 | ("\use qualified expression for one of the operands", |
996ae0b0 RK |
7313 | N); |
7314 | return; | |
7315 | ||
7316 | -- Another one for C programmers | |
7317 | ||
7318 | elsif Nkind (N) = N_Op_Concat | |
7319 | and then Valid_Boolean_Arg (Etype (L)) | |
7320 | and then Valid_Boolean_Arg (Etype (R)) | |
7321 | then | |
7322 | Error_Msg_N ("invalid operands for concatenation", N); | |
4e7a4f6e AC |
7323 | Error_Msg_N -- CODEFIX |
7324 | ("\maybe AND was meant", N); | |
996ae0b0 RK |
7325 | return; |
7326 | ||
7327 | -- A special case for comparison of access parameter with null | |
7328 | ||
7329 | elsif Nkind (N) = N_Op_Eq | |
7330 | and then Is_Entity_Name (L) | |
7331 | and then Nkind (Parent (Entity (L))) = N_Parameter_Specification | |
7332 | and then Nkind (Parameter_Type (Parent (Entity (L)))) = | |
7333 | N_Access_Definition | |
7334 | and then Nkind (R) = N_Null | |
7335 | then | |
7336 | Error_Msg_N ("access parameter is not allowed to be null", L); | |
7337 | Error_Msg_N ("\(call would raise Constraint_Error)", L); | |
7338 | return; | |
61bee0e3 AC |
7339 | |
7340 | -- Another special case for exponentiation, where the right | |
7341 | -- operand must be Natural, independently of the base. | |
7342 | ||
7343 | elsif Nkind (N) = N_Op_Expon | |
7344 | and then Is_Numeric_Type (Etype (L)) | |
7345 | and then not Is_Overloaded (R) | |
7346 | and then | |
7347 | First_Subtype (Base_Type (Etype (R))) /= Standard_Integer | |
7348 | and then Base_Type (Etype (R)) /= Universal_Integer | |
7349 | then | |
dec6faf1 | 7350 | if Ada_Version >= Ada_2012 |
15954beb | 7351 | and then Has_Dimension_System (Etype (L)) |
dec6faf1 AC |
7352 | then |
7353 | Error_Msg_NE | |
54c04d6c | 7354 | ("exponent for dimensioned type must be a rational" & |
dec6faf1 AC |
7355 | ", found}", R, Etype (R)); |
7356 | else | |
7357 | Error_Msg_NE | |
7358 | ("exponent must be of type Natural, found}", R, Etype (R)); | |
7359 | end if; | |
54c04d6c | 7360 | |
61bee0e3 | 7361 | return; |
11261647 AC |
7362 | |
7363 | elsif Nkind_In (N, N_Op_Eq, N_Op_Ne) then | |
7364 | if Address_Integer_Convert_OK (Etype (R), Etype (L)) then | |
7365 | Rewrite (R, | |
7366 | Unchecked_Convert_To (Etype (L), Relocate_Node (R))); | |
7367 | Analyze_Equality_Op (N); | |
7368 | return; | |
a8a42b93 AC |
7369 | |
7370 | -- Under relaxed RM semantics silently replace occurrences of | |
7371 | -- null by System.Address_Null. | |
7372 | ||
7373 | elsif Null_To_Null_Address_Convert_OK (N) then | |
7374 | Replace_Null_By_Null_Address (N); | |
7375 | Analyze_Equality_Op (N); | |
7376 | return; | |
11261647 | 7377 | end if; |
996ae0b0 RK |
7378 | end if; |
7379 | ||
0e0eecec ES |
7380 | -- If we fall through then just give general message. Note that in |
7381 | -- the following messages, if the operand is overloaded we choose | |
7382 | -- an arbitrary type to complain about, but that is probably more | |
7383 | -- useful than not giving a type at all. | |
996ae0b0 RK |
7384 | |
7385 | if Nkind (N) in N_Unary_Op then | |
7386 | Error_Msg_Node_2 := Etype (R); | |
7387 | Error_Msg_N ("operator& not defined for}", N); | |
7388 | return; | |
7389 | ||
7390 | else | |
fbf5a39b AC |
7391 | if Nkind (N) in N_Binary_Op then |
7392 | if not Is_Overloaded (L) | |
7393 | and then not Is_Overloaded (R) | |
7394 | and then Base_Type (Etype (L)) = Base_Type (Etype (R)) | |
7395 | then | |
7ffd9312 | 7396 | Error_Msg_Node_2 := First_Subtype (Etype (R)); |
fbf5a39b | 7397 | Error_Msg_N ("there is no applicable operator& for}", N); |
996ae0b0 | 7398 | |
fbf5a39b | 7399 | else |
b67a385c ES |
7400 | -- Another attempt to find a fix: one of the candidate |
7401 | -- interpretations may not be use-visible. This has | |
7402 | -- already been checked for predefined operators, so | |
7403 | -- we examine only user-defined functions. | |
7404 | ||
7405 | Op_Id := Get_Name_Entity_Id (Chars (N)); | |
7406 | ||
7407 | while Present (Op_Id) loop | |
7408 | if Ekind (Op_Id) /= E_Operator | |
7409 | and then Is_Overloadable (Op_Id) | |
7410 | then | |
7411 | if not Is_Immediately_Visible (Op_Id) | |
7412 | and then not In_Use (Scope (Op_Id)) | |
aab883ec | 7413 | and then not Is_Abstract_Subprogram (Op_Id) |
b67a385c ES |
7414 | and then not Is_Hidden (Op_Id) |
7415 | and then Ekind (Scope (Op_Id)) = E_Package | |
7416 | and then | |
7417 | Has_Compatible_Type | |
7418 | (L, Etype (First_Formal (Op_Id))) | |
7419 | and then Present | |
7420 | (Next_Formal (First_Formal (Op_Id))) | |
7421 | and then | |
7422 | Has_Compatible_Type | |
7423 | (R, | |
7424 | Etype (Next_Formal (First_Formal (Op_Id)))) | |
7425 | then | |
ed2233dc | 7426 | Error_Msg_N |
1d0b1439 | 7427 | ("no legal interpretation for operator&", N); |
ed2233dc | 7428 | Error_Msg_NE |
b67a385c | 7429 | ("\use clause on& would make operation legal", |
8b4230c8 | 7430 | N, Scope (Op_Id)); |
b67a385c ES |
7431 | exit; |
7432 | end if; | |
7433 | end if; | |
fbf5a39b | 7434 | |
b67a385c ES |
7435 | Op_Id := Homonym (Op_Id); |
7436 | end loop; | |
7437 | ||
7438 | if No (Op_Id) then | |
7439 | Error_Msg_N ("invalid operand types for operator&", N); | |
7440 | ||
7441 | if Nkind (N) /= N_Op_Concat then | |
7442 | Error_Msg_NE ("\left operand has}!", N, Etype (L)); | |
7443 | Error_Msg_NE ("\right operand has}!", N, Etype (R)); | |
2e70d415 | 7444 | |
1d0b1439 YM |
7445 | -- For multiplication and division operators with |
7446 | -- a fixed-point operand and an integer operand, | |
7447 | -- indicate that the integer operand should be of | |
7448 | -- type Integer. | |
7449 | ||
7450 | if Nkind_In (N, N_Op_Multiply, N_Op_Divide) | |
7451 | and then Is_Fixed_Point_Type (Etype (L)) | |
7452 | and then Is_Integer_Type (Etype (R)) | |
7453 | then | |
6578a6bf HK |
7454 | Error_Msg_N |
7455 | ("\convert right operand to `Integer`", N); | |
1d0b1439 YM |
7456 | |
7457 | elsif Nkind (N) = N_Op_Multiply | |
7458 | and then Is_Fixed_Point_Type (Etype (R)) | |
7459 | and then Is_Integer_Type (Etype (L)) | |
7460 | then | |
6578a6bf HK |
7461 | Error_Msg_N |
7462 | ("\convert left operand to `Integer`", N); | |
1d0b1439 YM |
7463 | end if; |
7464 | ||
2e70d415 AC |
7465 | -- For concatenation operators it is more difficult to |
7466 | -- determine which is the wrong operand. It is worth | |
7467 | -- flagging explicitly an access type, for those who | |
7468 | -- might think that a dereference happens here. | |
7469 | ||
7470 | elsif Is_Access_Type (Etype (L)) then | |
7471 | Error_Msg_N ("\left operand is access type", N); | |
7472 | ||
7473 | elsif Is_Access_Type (Etype (R)) then | |
7474 | Error_Msg_N ("\right operand is access type", N); | |
b67a385c | 7475 | end if; |
fbf5a39b AC |
7476 | end if; |
7477 | end if; | |
996ae0b0 RK |
7478 | end if; |
7479 | end if; | |
7480 | end; | |
7481 | end if; | |
7482 | end Operator_Check; | |
7483 | ||
6e73e3ab AC |
7484 | ----------------------------------------- |
7485 | -- Process_Implicit_Dereference_Prefix -- | |
7486 | ----------------------------------------- | |
7487 | ||
d469eabe | 7488 | function Process_Implicit_Dereference_Prefix |
da709d08 | 7489 | (E : Entity_Id; |
d469eabe | 7490 | P : Entity_Id) return Entity_Id |
6e73e3ab AC |
7491 | is |
7492 | Ref : Node_Id; | |
d469eabe | 7493 | Typ : constant Entity_Id := Designated_Type (Etype (P)); |
da709d08 | 7494 | |
6e73e3ab | 7495 | begin |
1a8fae99 ES |
7496 | if Present (E) |
7497 | and then (Operating_Mode = Check_Semantics or else not Expander_Active) | |
7498 | then | |
8b4230c8 AC |
7499 | -- We create a dummy reference to E to ensure that the reference is |
7500 | -- not considered as part of an assignment (an implicit dereference | |
7501 | -- can never assign to its prefix). The Comes_From_Source attribute | |
7502 | -- needs to be propagated for accurate warnings. | |
6e73e3ab | 7503 | |
e4494292 | 7504 | Ref := New_Occurrence_Of (E, Sloc (P)); |
6e73e3ab AC |
7505 | Set_Comes_From_Source (Ref, Comes_From_Source (P)); |
7506 | Generate_Reference (E, Ref); | |
7507 | end if; | |
d469eabe | 7508 | |
8b4230c8 AC |
7509 | -- An implicit dereference is a legal occurrence of an incomplete type |
7510 | -- imported through a limited_with clause, if the full view is visible. | |
d469eabe | 7511 | |
7b56a91b AC |
7512 | if From_Limited_With (Typ) |
7513 | and then not From_Limited_With (Scope (Typ)) | |
d469eabe HK |
7514 | and then |
7515 | (Is_Immediately_Visible (Scope (Typ)) | |
7516 | or else | |
7517 | (Is_Child_Unit (Scope (Typ)) | |
8398e82e | 7518 | and then Is_Visible_Lib_Unit (Scope (Typ)))) |
d469eabe HK |
7519 | then |
7520 | return Available_View (Typ); | |
7521 | else | |
7522 | return Typ; | |
7523 | end if; | |
6e73e3ab AC |
7524 | end Process_Implicit_Dereference_Prefix; |
7525 | ||
30c20106 AC |
7526 | -------------------------------- |
7527 | -- Remove_Abstract_Operations -- | |
7528 | -------------------------------- | |
7529 | ||
7530 | procedure Remove_Abstract_Operations (N : Node_Id) is | |
e80f0cb0 | 7531 | Abstract_Op : Entity_Id := Empty; |
d9d25d04 | 7532 | Address_Descendant : Boolean := False; |
e80f0cb0 RD |
7533 | I : Interp_Index; |
7534 | It : Interp; | |
30c20106 | 7535 | |
0e0eecec ES |
7536 | -- AI-310: If overloaded, remove abstract non-dispatching operations. We |
7537 | -- activate this if either extensions are enabled, or if the abstract | |
7538 | -- operation in question comes from a predefined file. This latter test | |
7539 | -- allows us to use abstract to make operations invisible to users. In | |
7540 | -- particular, if type Address is non-private and abstract subprograms | |
7541 | -- are used to hide its operators, they will be truly hidden. | |
30c20106 | 7542 | |
5950a3ac | 7543 | type Operand_Position is (First_Op, Second_Op); |
8a36a0cc | 7544 | Univ_Type : constant Entity_Id := Universal_Interpretation (N); |
5950a3ac AC |
7545 | |
7546 | procedure Remove_Address_Interpretations (Op : Operand_Position); | |
0e0eecec ES |
7547 | -- Ambiguities may arise when the operands are literal and the address |
7548 | -- operations in s-auxdec are visible. In that case, remove the | |
8b4230c8 AC |
7549 | -- interpretation of a literal as Address, to retain the semantics |
7550 | -- of Address as a private type. | |
9f4fd324 AC |
7551 | |
7552 | ------------------------------------ | |
5950a3ac | 7553 | -- Remove_Address_Interpretations -- |
9f4fd324 AC |
7554 | ------------------------------------ |
7555 | ||
5950a3ac | 7556 | procedure Remove_Address_Interpretations (Op : Operand_Position) is |
9f4fd324 AC |
7557 | Formal : Entity_Id; |
7558 | ||
7559 | begin | |
7560 | if Is_Overloaded (N) then | |
7561 | Get_First_Interp (N, I, It); | |
7562 | while Present (It.Nam) loop | |
7563 | Formal := First_Entity (It.Nam); | |
7564 | ||
5950a3ac AC |
7565 | if Op = Second_Op then |
7566 | Formal := Next_Entity (Formal); | |
7567 | end if; | |
7568 | ||
d9d25d04 AC |
7569 | if Is_Descendant_Of_Address (Etype (Formal)) then |
7570 | Address_Descendant := True; | |
9f4fd324 AC |
7571 | Remove_Interp (I); |
7572 | end if; | |
7573 | ||
7574 | Get_Next_Interp (I, It); | |
7575 | end loop; | |
7576 | end if; | |
7577 | end Remove_Address_Interpretations; | |
7578 | ||
7579 | -- Start of processing for Remove_Abstract_Operations | |
7580 | ||
30c20106 | 7581 | begin |
d935a36e | 7582 | if Is_Overloaded (N) then |
ee1a7572 | 7583 | if Debug_Flag_V then |
ba301a3b | 7584 | Write_Line ("Remove_Abstract_Operations: "); |
ee1a7572 AC |
7585 | Write_Overloads (N); |
7586 | end if; | |
7587 | ||
30c20106 | 7588 | Get_First_Interp (N, I, It); |
d935a36e | 7589 | |
30c20106 | 7590 | while Present (It.Nam) loop |
aab883ec ES |
7591 | if Is_Overloadable (It.Nam) |
7592 | and then Is_Abstract_Subprogram (It.Nam) | |
30c20106 AC |
7593 | and then not Is_Dispatching_Operation (It.Nam) |
7594 | then | |
af152989 | 7595 | Abstract_Op := It.Nam; |
fe45e59e | 7596 | |
d9d25d04 AC |
7597 | if Is_Descendant_Of_Address (It.Typ) then |
7598 | Address_Descendant := True; | |
401093c1 ES |
7599 | Remove_Interp (I); |
7600 | exit; | |
7601 | ||
76264f60 | 7602 | -- In Ada 2005, this operation does not participate in overload |
9c510803 | 7603 | -- resolution. If the operation is defined in a predefined |
fe45e59e ES |
7604 | -- unit, it is one of the operations declared abstract in some |
7605 | -- variants of System, and it must be removed as well. | |
7606 | ||
0791fbe9 | 7607 | elsif Ada_Version >= Ada_2005 |
8ab31c0c | 7608 | or else In_Predefined_Unit (It.Nam) |
fe45e59e ES |
7609 | then |
7610 | Remove_Interp (I); | |
7611 | exit; | |
7612 | end if; | |
30c20106 AC |
7613 | end if; |
7614 | ||
7615 | Get_Next_Interp (I, It); | |
7616 | end loop; | |
7617 | ||
af152989 | 7618 | if No (Abstract_Op) then |
fe45e59e ES |
7619 | |
7620 | -- If some interpretation yields an integer type, it is still | |
7621 | -- possible that there are address interpretations. Remove them | |
7622 | -- if one operand is a literal, to avoid spurious ambiguities | |
7623 | -- on systems where Address is a visible integer type. | |
7624 | ||
7625 | if Is_Overloaded (N) | |
401093c1 | 7626 | and then Nkind (N) in N_Op |
fe45e59e ES |
7627 | and then Is_Integer_Type (Etype (N)) |
7628 | then | |
7629 | if Nkind (N) in N_Binary_Op then | |
7630 | if Nkind (Right_Opnd (N)) = N_Integer_Literal then | |
7631 | Remove_Address_Interpretations (Second_Op); | |
7632 | ||
e6326de5 | 7633 | elsif Nkind (Left_Opnd (N)) = N_Integer_Literal then |
fe45e59e ES |
7634 | Remove_Address_Interpretations (First_Op); |
7635 | end if; | |
7636 | end if; | |
7637 | end if; | |
3984e89a AC |
7638 | |
7639 | elsif Nkind (N) in N_Op then | |
4c46b835 | 7640 | |
fe45e59e ES |
7641 | -- Remove interpretations that treat literals as addresses. This |
7642 | -- is never appropriate, even when Address is defined as a visible | |
7643 | -- Integer type. The reason is that we would really prefer Address | |
7a5b62b0 AC |
7644 | -- to behave as a private type, even in this case. If Address is a |
7645 | -- visible integer type, we get lots of overload ambiguities. | |
30c20106 | 7646 | |
5950a3ac AC |
7647 | if Nkind (N) in N_Binary_Op then |
7648 | declare | |
7649 | U1 : constant Boolean := | |
8b4230c8 | 7650 | Present (Universal_Interpretation (Right_Opnd (N))); |
5950a3ac | 7651 | U2 : constant Boolean := |
8b4230c8 | 7652 | Present (Universal_Interpretation (Left_Opnd (N))); |
30c20106 | 7653 | |
5950a3ac | 7654 | begin |
0e0eecec | 7655 | if U1 then |
5950a3ac | 7656 | Remove_Address_Interpretations (Second_Op); |
0e0eecec | 7657 | end if; |
5950a3ac | 7658 | |
0e0eecec | 7659 | if U2 then |
5950a3ac | 7660 | Remove_Address_Interpretations (First_Op); |
30c20106 AC |
7661 | end if; |
7662 | ||
5950a3ac AC |
7663 | if not (U1 and U2) then |
7664 | ||
7665 | -- Remove corresponding predefined operator, which is | |
7666 | -- always added to the overload set. | |
7667 | ||
7668 | Get_First_Interp (N, I, It); | |
7669 | while Present (It.Nam) loop | |
0ab80019 AC |
7670 | if Scope (It.Nam) = Standard_Standard |
7671 | and then Base_Type (It.Typ) = | |
7672 | Base_Type (Etype (Abstract_Op)) | |
7673 | then | |
5950a3ac AC |
7674 | Remove_Interp (I); |
7675 | end if; | |
7676 | ||
8a36a0cc AC |
7677 | Get_Next_Interp (I, It); |
7678 | end loop; | |
7679 | ||
7680 | elsif Is_Overloaded (N) | |
7681 | and then Present (Univ_Type) | |
7682 | then | |
7683 | -- If both operands have a universal interpretation, | |
0e0eecec ES |
7684 | -- it is still necessary to remove interpretations that |
7685 | -- yield Address. Any remaining ambiguities will be | |
7686 | -- removed in Disambiguate. | |
8a36a0cc AC |
7687 | |
7688 | Get_First_Interp (N, I, It); | |
8a36a0cc | 7689 | while Present (It.Nam) loop |
d9d25d04 | 7690 | if Is_Descendant_Of_Address (It.Typ) then |
0e0eecec ES |
7691 | Remove_Interp (I); |
7692 | ||
7693 | elsif not Is_Type (It.Nam) then | |
8a36a0cc | 7694 | Set_Entity (N, It.Nam); |
8a36a0cc AC |
7695 | end if; |
7696 | ||
5950a3ac AC |
7697 | Get_Next_Interp (I, It); |
7698 | end loop; | |
7699 | end if; | |
7700 | end; | |
30c20106 | 7701 | end if; |
3984e89a AC |
7702 | |
7703 | elsif Nkind (N) = N_Function_Call | |
7704 | and then | |
7705 | (Nkind (Name (N)) = N_Operator_Symbol | |
7706 | or else | |
7707 | (Nkind (Name (N)) = N_Expanded_Name | |
7708 | and then | |
7709 | Nkind (Selector_Name (Name (N))) = N_Operator_Symbol)) | |
7710 | then | |
5950a3ac | 7711 | |
3984e89a AC |
7712 | declare |
7713 | Arg1 : constant Node_Id := First (Parameter_Associations (N)); | |
5950a3ac AC |
7714 | U1 : constant Boolean := |
7715 | Present (Universal_Interpretation (Arg1)); | |
7716 | U2 : constant Boolean := | |
7717 | Present (Next (Arg1)) and then | |
7718 | Present (Universal_Interpretation (Next (Arg1))); | |
3984e89a AC |
7719 | |
7720 | begin | |
0e0eecec | 7721 | if U1 then |
5950a3ac | 7722 | Remove_Address_Interpretations (First_Op); |
0e0eecec | 7723 | end if; |
3984e89a | 7724 | |
0e0eecec | 7725 | if U2 then |
5950a3ac AC |
7726 | Remove_Address_Interpretations (Second_Op); |
7727 | end if; | |
7728 | ||
7729 | if not (U1 and U2) then | |
3984e89a AC |
7730 | Get_First_Interp (N, I, It); |
7731 | while Present (It.Nam) loop | |
9f4fd324 AC |
7732 | if Scope (It.Nam) = Standard_Standard |
7733 | and then It.Typ = Base_Type (Etype (Abstract_Op)) | |
7734 | then | |
3984e89a AC |
7735 | Remove_Interp (I); |
7736 | end if; | |
7737 | ||
7738 | Get_Next_Interp (I, It); | |
7739 | end loop; | |
7740 | end if; | |
7741 | end; | |
30c20106 | 7742 | end if; |
af152989 | 7743 | |
401093c1 ES |
7744 | -- If the removal has left no valid interpretations, emit an error |
7745 | -- message now and label node as illegal. | |
af152989 AC |
7746 | |
7747 | if Present (Abstract_Op) then | |
7748 | Get_First_Interp (N, I, It); | |
7749 | ||
7750 | if No (It.Nam) then | |
7751 | ||
6e73e3ab | 7752 | -- Removal of abstract operation left no viable candidate |
af152989 AC |
7753 | |
7754 | Set_Etype (N, Any_Type); | |
7755 | Error_Msg_Sloc := Sloc (Abstract_Op); | |
7756 | Error_Msg_NE | |
7757 | ("cannot call abstract operation& declared#", N, Abstract_Op); | |
401093c1 ES |
7758 | |
7759 | -- In Ada 2005, an abstract operation may disable predefined | |
7760 | -- operators. Since the context is not yet known, we mark the | |
7761 | -- predefined operators as potentially hidden. Do not include | |
7762 | -- predefined operators when addresses are involved since this | |
7763 | -- case is handled separately. | |
7764 | ||
d9d25d04 | 7765 | elsif Ada_Version >= Ada_2005 and then not Address_Descendant then |
401093c1 ES |
7766 | while Present (It.Nam) loop |
7767 | if Is_Numeric_Type (It.Typ) | |
7768 | and then Scope (It.Typ) = Standard_Standard | |
7769 | then | |
7770 | Set_Abstract_Op (I, Abstract_Op); | |
7771 | end if; | |
7772 | ||
7773 | Get_Next_Interp (I, It); | |
7774 | end loop; | |
af152989 AC |
7775 | end if; |
7776 | end if; | |
ee1a7572 AC |
7777 | |
7778 | if Debug_Flag_V then | |
ba301a3b | 7779 | Write_Line ("Remove_Abstract_Operations done: "); |
ee1a7572 AC |
7780 | Write_Overloads (N); |
7781 | end if; | |
30c20106 AC |
7782 | end if; |
7783 | end Remove_Abstract_Operations; | |
7784 | ||
d50f4827 AC |
7785 | ---------------------------- |
7786 | -- Try_Container_Indexing -- | |
7787 | ---------------------------- | |
7788 | ||
7789 | function Try_Container_Indexing | |
7790 | (N : Node_Id; | |
7791 | Prefix : Node_Id; | |
50878404 | 7792 | Exprs : List_Id) return Boolean |
d50f4827 | 7793 | is |
437244c7 AC |
7794 | Pref_Typ : constant Entity_Id := Etype (Prefix); |
7795 | ||
0c3ef0cc GD |
7796 | function Constant_Indexing_OK return Boolean; |
7797 | -- Constant_Indexing is legal if there is no Variable_Indexing defined | |
7798 | -- for the type, or else node not a target of assignment, or an actual | |
7799 | -- for an IN OUT or OUT formal (RM 4.1.6 (11)). | |
7800 | ||
211e7410 AC |
7801 | function Expr_Matches_In_Formal |
7802 | (Subp : Entity_Id; | |
7803 | Par : Node_Id) return Boolean; | |
7804 | -- Find formal corresponding to given indexed component that is an | |
7805 | -- actual in a call. Note that the enclosing subprogram call has not | |
0c3ef0cc | 7806 | -- been analyzed yet, and the parameter list is not normalized, so |
211e7410 AC |
7807 | -- that if the argument is a parameter association we must match it |
7808 | -- by name and not by position. | |
7809 | ||
437244c7 AC |
7810 | function Find_Indexing_Operations |
7811 | (T : Entity_Id; | |
7812 | Nam : Name_Id; | |
7813 | Is_Constant : Boolean) return Node_Id; | |
7814 | -- Return a reference to the primitive operation of type T denoted by | |
7815 | -- name Nam. If the operation is overloaded, the reference carries all | |
7816 | -- interpretations. Flag Is_Constant should be set when the context is | |
7817 | -- constant indexing. | |
7818 | ||
fa73fc3d AC |
7819 | -------------------------- |
7820 | -- Constant_Indexing_OK -- | |
7821 | -------------------------- | |
7822 | ||
7823 | function Constant_Indexing_OK return Boolean is | |
7824 | Par : Node_Id; | |
7825 | ||
7826 | begin | |
437244c7 | 7827 | if No (Find_Value_Of_Aspect (Pref_Typ, Aspect_Variable_Indexing)) then |
fa73fc3d AC |
7828 | return True; |
7829 | ||
7830 | elsif not Is_Variable (Prefix) then | |
7831 | return True; | |
7832 | end if; | |
7833 | ||
7834 | Par := N; | |
7835 | while Present (Par) loop | |
7836 | if Nkind (Parent (Par)) = N_Assignment_Statement | |
7837 | and then Par = Name (Parent (Par)) | |
7838 | then | |
7839 | return False; | |
7840 | ||
7841 | -- The call may be overloaded, in which case we assume that its | |
7842 | -- resolution does not depend on the type of the parameter that | |
7843 | -- includes the indexing operation. | |
7844 | ||
7845 | elsif Nkind_In (Parent (Par), N_Function_Call, | |
7846 | N_Procedure_Call_Statement) | |
7847 | and then Is_Entity_Name (Name (Parent (Par))) | |
7848 | then | |
7849 | declare | |
fa73fc3d AC |
7850 | Proc : Entity_Id; |
7851 | ||
7852 | begin | |
7853 | -- We should look for an interpretation with the proper | |
7854 | -- number of formals, and determine whether it is an | |
31101470 AC |
7855 | -- In_Parameter, but for now we examine the formal that |
7856 | -- corresponds to the indexing, and assume that variable | |
7857 | -- indexing is required if some interpretation has an | |
64ac53f4 | 7858 | -- assignable formal at that position. Still does not |
31101470 | 7859 | -- cover the most complex cases ??? |
fa73fc3d AC |
7860 | |
7861 | if Is_Overloaded (Name (Parent (Par))) then | |
31101470 AC |
7862 | declare |
7863 | Proc : constant Node_Id := Name (Parent (Par)); | |
31101470 AC |
7864 | I : Interp_Index; |
7865 | It : Interp; | |
7866 | ||
7867 | begin | |
7868 | Get_First_Interp (Proc, I, It); | |
7869 | while Present (It.Nam) loop | |
211e7410 AC |
7870 | if not Expr_Matches_In_Formal (It.Nam, Par) then |
7871 | return False; | |
7872 | end if; | |
31101470 AC |
7873 | |
7874 | Get_Next_Interp (I, It); | |
7875 | end loop; | |
7876 | end; | |
7877 | ||
0c3ef0cc | 7878 | -- All interpretations have a matching in-mode formal |
211e7410 | 7879 | |
fa73fc3d AC |
7880 | return True; |
7881 | ||
7882 | else | |
7883 | Proc := Entity (Name (Parent (Par))); | |
7884 | ||
7885 | -- If this is an indirect call, get formals from | |
7886 | -- designated type. | |
7887 | ||
7888 | if Is_Access_Subprogram_Type (Etype (Proc)) then | |
7889 | Proc := Designated_Type (Etype (Proc)); | |
7890 | end if; | |
7891 | end if; | |
7892 | ||
211e7410 | 7893 | return Expr_Matches_In_Formal (Proc, Par); |
fa73fc3d AC |
7894 | end; |
7895 | ||
7896 | elsif Nkind (Parent (Par)) = N_Object_Renaming_Declaration then | |
7897 | return False; | |
7898 | ||
7899 | -- If the indexed component is a prefix it may be the first actual | |
7900 | -- of a prefixed call. Retrieve the called entity, if any, and | |
4e9ee595 AC |
7901 | -- check its first formal. Determine if the context is a procedure |
7902 | -- or function call. | |
fa73fc3d AC |
7903 | |
7904 | elsif Nkind (Parent (Par)) = N_Selected_Component then | |
7905 | declare | |
7906 | Sel : constant Node_Id := Selector_Name (Parent (Par)); | |
7907 | Nam : constant Entity_Id := Current_Entity (Sel); | |
7908 | ||
7909 | begin | |
bc38dbb4 AC |
7910 | if Present (Nam) and then Is_Overloadable (Nam) then |
7911 | if Nkind (Parent (Parent (Par))) = | |
7912 | N_Procedure_Call_Statement | |
4e9ee595 AC |
7913 | then |
7914 | return False; | |
7915 | ||
bc38dbb4 AC |
7916 | elsif Ekind (Nam) = E_Function |
7917 | and then Present (First_Formal (Nam)) | |
7918 | then | |
7919 | return Ekind (First_Formal (Nam)) = E_In_Parameter; | |
4e9ee595 | 7920 | end if; |
fa73fc3d AC |
7921 | end if; |
7922 | end; | |
7923 | ||
437244c7 | 7924 | elsif Nkind (Par) in N_Op then |
fa73fc3d AC |
7925 | return True; |
7926 | end if; | |
7927 | ||
7928 | Par := Parent (Par); | |
7929 | end loop; | |
7930 | ||
7931 | -- In all other cases, constant indexing is legal | |
7932 | ||
7933 | return True; | |
7934 | end Constant_Indexing_OK; | |
7935 | ||
f32eb591 AC |
7936 | ---------------------------- |
7937 | -- Expr_Matches_In_Formal -- | |
7938 | ---------------------------- | |
0c3ef0cc GD |
7939 | |
7940 | function Expr_Matches_In_Formal | |
7941 | (Subp : Entity_Id; | |
7942 | Par : Node_Id) return Boolean | |
7943 | is | |
7944 | Actual : Node_Id; | |
7945 | Formal : Node_Id; | |
7946 | ||
7947 | begin | |
7948 | Formal := First_Formal (Subp); | |
7949 | Actual := First (Parameter_Associations ((Parent (Par)))); | |
7950 | ||
7951 | if Nkind (Par) /= N_Parameter_Association then | |
7952 | ||
7953 | -- Match by position | |
7954 | ||
7955 | while Present (Actual) and then Present (Formal) loop | |
7956 | exit when Actual = Par; | |
7957 | Next (Actual); | |
7958 | ||
7959 | if Present (Formal) then | |
7960 | Next_Formal (Formal); | |
7961 | ||
7962 | -- Otherwise this is a parameter mismatch, the error is | |
7963 | -- reported elsewhere, or else variable indexing is implied. | |
7964 | ||
7965 | else | |
7966 | return False; | |
7967 | end if; | |
7968 | end loop; | |
7969 | ||
7970 | else | |
7971 | -- Match by name | |
7972 | ||
7973 | while Present (Formal) loop | |
7974 | exit when Chars (Formal) = Chars (Selector_Name (Par)); | |
7975 | Next_Formal (Formal); | |
7976 | ||
7977 | if No (Formal) then | |
7978 | return False; | |
7979 | end if; | |
7980 | end loop; | |
7981 | end if; | |
7982 | ||
7983 | return Present (Formal) and then Ekind (Formal) = E_In_Parameter; | |
7984 | end Expr_Matches_In_Formal; | |
7985 | ||
437244c7 AC |
7986 | ------------------------------ |
7987 | -- Find_Indexing_Operations -- | |
7988 | ------------------------------ | |
7989 | ||
7990 | function Find_Indexing_Operations | |
7991 | (T : Entity_Id; | |
7992 | Nam : Name_Id; | |
7993 | Is_Constant : Boolean) return Node_Id | |
7994 | is | |
7995 | procedure Inspect_Declarations | |
7996 | (Typ : Entity_Id; | |
7997 | Ref : in out Node_Id); | |
7998 | -- Traverse the declarative list where type Typ resides and collect | |
7999 | -- all suitable interpretations in node Ref. | |
8000 | ||
8001 | procedure Inspect_Primitives | |
8002 | (Typ : Entity_Id; | |
8003 | Ref : in out Node_Id); | |
8004 | -- Traverse the list of primitive operations of type Typ and collect | |
8005 | -- all suitable interpretations in node Ref. | |
8006 | ||
8007 | function Is_OK_Candidate | |
8008 | (Subp_Id : Entity_Id; | |
8009 | Typ : Entity_Id) return Boolean; | |
8010 | -- Determine whether subprogram Subp_Id is a suitable indexing | |
8011 | -- operation for type Typ. To qualify as such, the subprogram must | |
8012 | -- be a function, have at least two parameters, and the type of the | |
8013 | -- first parameter must be either Typ, or Typ'Class, or access [to | |
8014 | -- constant] with designated type Typ or Typ'Class. | |
8015 | ||
8016 | procedure Record_Interp (Subp_Id : Entity_Id; Ref : in out Node_Id); | |
8017 | -- Store subprogram Subp_Id as an interpretation in node Ref | |
8018 | ||
8019 | -------------------------- | |
8020 | -- Inspect_Declarations -- | |
8021 | -------------------------- | |
8022 | ||
8023 | procedure Inspect_Declarations | |
8024 | (Typ : Entity_Id; | |
8025 | Ref : in out Node_Id) | |
8026 | is | |
8027 | Typ_Decl : constant Node_Id := Declaration_Node (Typ); | |
8028 | Decl : Node_Id; | |
8029 | Subp_Id : Entity_Id; | |
8030 | ||
8031 | begin | |
2cc2e964 | 8032 | -- Ensure that the routine is not called with itypes, which lack a |
437244c7 AC |
8033 | -- declarative node. |
8034 | ||
8035 | pragma Assert (Present (Typ_Decl)); | |
8036 | pragma Assert (Is_List_Member (Typ_Decl)); | |
8037 | ||
8038 | Decl := First (List_Containing (Typ_Decl)); | |
8039 | while Present (Decl) loop | |
8040 | if Nkind (Decl) = N_Subprogram_Declaration then | |
8041 | Subp_Id := Defining_Entity (Decl); | |
8042 | ||
8043 | if Is_OK_Candidate (Subp_Id, Typ) then | |
8044 | Record_Interp (Subp_Id, Ref); | |
8045 | end if; | |
8046 | end if; | |
8047 | ||
8048 | Next (Decl); | |
8049 | end loop; | |
8050 | end Inspect_Declarations; | |
8051 | ||
8052 | ------------------------ | |
8053 | -- Inspect_Primitives -- | |
8054 | ------------------------ | |
8055 | ||
8056 | procedure Inspect_Primitives | |
8057 | (Typ : Entity_Id; | |
8058 | Ref : in out Node_Id) | |
8059 | is | |
8060 | Prim_Elmt : Elmt_Id; | |
8061 | Prim_Id : Entity_Id; | |
8062 | ||
8063 | begin | |
8064 | Prim_Elmt := First_Elmt (Primitive_Operations (Typ)); | |
8065 | while Present (Prim_Elmt) loop | |
8066 | Prim_Id := Node (Prim_Elmt); | |
8067 | ||
8068 | if Is_OK_Candidate (Prim_Id, Typ) then | |
8069 | Record_Interp (Prim_Id, Ref); | |
8070 | end if; | |
8071 | ||
8072 | Next_Elmt (Prim_Elmt); | |
8073 | end loop; | |
8074 | end Inspect_Primitives; | |
8075 | ||
8076 | --------------------- | |
8077 | -- Is_OK_Candidate -- | |
8078 | --------------------- | |
8079 | ||
8080 | function Is_OK_Candidate | |
8081 | (Subp_Id : Entity_Id; | |
8082 | Typ : Entity_Id) return Boolean | |
8083 | is | |
8084 | Formal : Entity_Id; | |
8085 | Formal_Typ : Entity_Id; | |
8086 | Param_Typ : Node_Id; | |
8087 | ||
8088 | begin | |
2cc2e964 | 8089 | -- To classify as a suitable candidate, the subprogram must be a |
437244c7 AC |
8090 | -- function whose name matches the argument of aspect Constant or |
8091 | -- Variable_Indexing. | |
8092 | ||
8093 | if Ekind (Subp_Id) = E_Function and then Chars (Subp_Id) = Nam then | |
8094 | Formal := First_Formal (Subp_Id); | |
8095 | ||
8096 | -- The candidate requires at least two parameters | |
8097 | ||
8098 | if Present (Formal) and then Present (Next_Formal (Formal)) then | |
8099 | Formal_Typ := Empty; | |
8100 | Param_Typ := Parameter_Type (Parent (Formal)); | |
8101 | ||
8102 | -- Use the designated type when the first parameter is of an | |
8103 | -- access type. | |
8104 | ||
8105 | if Nkind (Param_Typ) = N_Access_Definition | |
8106 | and then Present (Subtype_Mark (Param_Typ)) | |
8107 | then | |
8108 | -- When the context is a constant indexing, the access | |
8109 | -- definition must be access-to-constant. This does not | |
8110 | -- apply to variable indexing. | |
8111 | ||
8112 | if not Is_Constant | |
8113 | or else Constant_Present (Param_Typ) | |
8114 | then | |
8115 | Formal_Typ := Etype (Subtype_Mark (Param_Typ)); | |
8116 | end if; | |
8117 | ||
8118 | -- Otherwise use the parameter type | |
8119 | ||
8120 | else | |
8121 | Formal_Typ := Etype (Param_Typ); | |
8122 | end if; | |
8123 | ||
8124 | if Present (Formal_Typ) then | |
8125 | ||
8126 | -- Use the specific type when the parameter type is | |
8127 | -- class-wide. | |
8128 | ||
8129 | if Is_Class_Wide_Type (Formal_Typ) then | |
8130 | Formal_Typ := Etype (Base_Type (Formal_Typ)); | |
8131 | end if; | |
8132 | ||
8133 | -- Use the full view when the parameter type is private | |
8134 | -- or incomplete. | |
8135 | ||
8136 | if Is_Incomplete_Or_Private_Type (Formal_Typ) | |
8137 | and then Present (Full_View (Formal_Typ)) | |
8138 | then | |
8139 | Formal_Typ := Full_View (Formal_Typ); | |
8140 | end if; | |
8141 | ||
8142 | -- The type of the first parameter must denote the type | |
8143 | -- of the container or acts as its ancestor type. | |
8144 | ||
8145 | return | |
8146 | Formal_Typ = Typ | |
8147 | or else Is_Ancestor (Formal_Typ, Typ); | |
8148 | end if; | |
8149 | end if; | |
8150 | end if; | |
8151 | ||
8152 | return False; | |
8153 | end Is_OK_Candidate; | |
8154 | ||
8155 | ------------------- | |
8156 | -- Record_Interp -- | |
8157 | ------------------- | |
8158 | ||
8159 | procedure Record_Interp (Subp_Id : Entity_Id; Ref : in out Node_Id) is | |
8160 | begin | |
8161 | if Present (Ref) then | |
8162 | Add_One_Interp (Ref, Subp_Id, Etype (Subp_Id)); | |
8163 | ||
8164 | -- Otherwise this is the first interpretation. Create a reference | |
8165 | -- where all remaining interpretations will be collected. | |
8166 | ||
8167 | else | |
8168 | Ref := New_Occurrence_Of (Subp_Id, Sloc (T)); | |
8169 | end if; | |
8170 | end Record_Interp; | |
8171 | ||
8172 | -- Local variables | |
8173 | ||
8174 | Ref : Node_Id; | |
8175 | Typ : Entity_Id; | |
8176 | ||
8177 | -- Start of processing for Find_Indexing_Operations | |
8178 | ||
8179 | begin | |
8180 | Typ := T; | |
8181 | ||
1e60643a AC |
8182 | -- Use the specific type when the parameter type is class-wide |
8183 | ||
437244c7 AC |
8184 | if Is_Class_Wide_Type (Typ) then |
8185 | Typ := Root_Type (Typ); | |
8186 | end if; | |
8187 | ||
8188 | Ref := Empty; | |
1e60643a | 8189 | Typ := Underlying_Type (Base_Type (Typ)); |
437244c7 | 8190 | |
e11b776b AC |
8191 | Inspect_Primitives (Typ, Ref); |
8192 | ||
8193 | -- Now look for explicit declarations of an indexing operation. | |
8194 | -- If the type is private the operation may be declared in the | |
8195 | -- visible part that contains the partial view. | |
8196 | ||
8197 | if Is_Private_Type (T) then | |
8198 | Inspect_Declarations (T, Ref); | |
8199 | end if; | |
8200 | ||
437244c7 AC |
8201 | Inspect_Declarations (Typ, Ref); |
8202 | ||
8203 | return Ref; | |
8204 | end Find_Indexing_Operations; | |
8205 | ||
fa73fc3d AC |
8206 | -- Local variables |
8207 | ||
d50f4827 | 8208 | Loc : constant Source_Ptr := Sloc (N); |
50878404 | 8209 | Assoc : List_Id; |
fa73fc3d | 8210 | C_Type : Entity_Id; |
d50f4827 AC |
8211 | Func : Entity_Id; |
8212 | Func_Name : Node_Id; | |
8213 | Indexing : Node_Id; | |
d50f4827 | 8214 | |
437244c7 AC |
8215 | Is_Constant_Indexing : Boolean := False; |
8216 | -- This flag reflects the nature of the container indexing. Note that | |
8217 | -- the context may be suited for constant indexing, but the type may | |
8218 | -- lack a Constant_Indexing annotation. | |
8219 | ||
fa73fc3d AC |
8220 | -- Start of processing for Try_Container_Indexing |
8221 | ||
d50f4827 | 8222 | begin |
fa73fc3d AC |
8223 | -- Node may have been analyzed already when testing for a prefixed |
8224 | -- call, in which case do not redo analysis. | |
8225 | ||
8226 | if Present (Generalized_Indexing (N)) then | |
8227 | return True; | |
8228 | end if; | |
8229 | ||
437244c7 | 8230 | C_Type := Pref_Typ; |
f3296dd3 | 8231 | |
fa73fc3d AC |
8232 | -- If indexing a class-wide container, obtain indexing primitive from |
8233 | -- specific type. | |
f3296dd3 AC |
8234 | |
8235 | if Is_Class_Wide_Type (C_Type) then | |
8236 | C_Type := Etype (Base_Type (C_Type)); | |
8237 | end if; | |
d50f4827 | 8238 | |
2cc2e964 | 8239 | -- Check whether the type has a specified indexing aspect |
d50f4827 AC |
8240 | |
8241 | Func_Name := Empty; | |
d50f4827 | 8242 | |
2cc2e964 AC |
8243 | -- The context is suitable for constant indexing, so obtain the name of |
8244 | -- the indexing function from aspect Constant_Indexing. | |
437244c7 | 8245 | |
fa73fc3d | 8246 | if Constant_Indexing_OK then |
d62520f3 | 8247 | Func_Name := |
437244c7 | 8248 | Find_Value_Of_Aspect (Pref_Typ, Aspect_Constant_Indexing); |
9ee76313 | 8249 | end if; |
dedac3eb | 8250 | |
437244c7 AC |
8251 | if Present (Func_Name) then |
8252 | Is_Constant_Indexing := True; | |
8253 | ||
8254 | -- Otherwise attempt variable indexing | |
8255 | ||
8256 | else | |
d62520f3 | 8257 | Func_Name := |
437244c7 | 8258 | Find_Value_Of_Aspect (Pref_Typ, Aspect_Variable_Indexing); |
9ee76313 | 8259 | end if; |
d50f4827 | 8260 | |
437244c7 AC |
8261 | -- The type is not subject to either form of indexing, therefore the |
8262 | -- indexed component does not denote container indexing. If this is a | |
8263 | -- true error, it is diagnosed by the caller. | |
d50f4827 AC |
8264 | |
8265 | if No (Func_Name) then | |
57a8057a | 8266 | |
437244c7 AC |
8267 | -- The prefix itself may be an indexing of a container. Rewrite it |
8268 | -- as such and retry. | |
57a8057a | 8269 | |
437244c7 AC |
8270 | if Has_Implicit_Dereference (Pref_Typ) then |
8271 | Build_Explicit_Dereference (Prefix, First_Discriminant (Pref_Typ)); | |
50878404 | 8272 | return Try_Container_Indexing (N, Prefix, Exprs); |
57a8057a | 8273 | |
437244c7 AC |
8274 | -- Otherwise this is definitely not container indexing |
8275 | ||
57a8057a AC |
8276 | else |
8277 | return False; | |
8278 | end if; | |
3f433bc0 | 8279 | |
6907542d AC |
8280 | -- If the container type is derived from another container type, the |
8281 | -- value of the inherited aspect is the Reference operation declared | |
8282 | -- for the parent type. | |
8283 | ||
fa73fc3d AC |
8284 | -- However, Reference is also a primitive operation of the type, and the |
8285 | -- inherited operation has a different signature. We retrieve the right | |
8286 | -- ones (the function may be overloaded) from the list of primitive | |
8287 | -- operations of the derived type. | |
3f433bc0 | 8288 | |
fa73fc3d AC |
8289 | -- Note that predefined containers are typically all derived from one of |
8290 | -- the Controlled types. The code below is motivated by containers that | |
8291 | -- are derived from other types with a Reference aspect. | |
c85dda72 ES |
8292 | -- Note as well that we need to examine the base type, given that |
8293 | -- the container object may be a constrained subtype or itype which | |
8294 | -- does not have an explicit declaration, | |
6907542d | 8295 | |
f3296dd3 | 8296 | elsif Is_Derived_Type (C_Type) |
437244c7 | 8297 | and then Etype (First_Formal (Entity (Func_Name))) /= Pref_Typ |
6907542d | 8298 | then |
437244c7 AC |
8299 | Func_Name := |
8300 | Find_Indexing_Operations | |
c85dda72 | 8301 | (T => Base_Type (C_Type), |
437244c7 AC |
8302 | Nam => Chars (Func_Name), |
8303 | Is_Constant => Is_Constant_Indexing); | |
d50f4827 AC |
8304 | end if; |
8305 | ||
50878404 AC |
8306 | Assoc := New_List (Relocate_Node (Prefix)); |
8307 | ||
5f50020a | 8308 | -- A generalized indexing may have nore than one index expression, so |
50878404 | 8309 | -- transfer all of them to the argument list to be used in the call. |
5f50020a ES |
8310 | -- Note that there may be named associations, in which case the node |
8311 | -- was rewritten earlier as a call, and has been transformed back into | |
8312 | -- an indexed expression to share the following processing. | |
e917e3b8 | 8313 | |
5f50020a ES |
8314 | -- The generalized indexing node is the one on which analysis and |
8315 | -- resolution take place. Before expansion the original node is replaced | |
fa73fc3d AC |
8316 | -- with the generalized indexing node, which is a call, possibly with a |
8317 | -- dereference operation. | |
50878404 | 8318 | |
e917e3b8 | 8319 | if Comes_From_Source (N) then |
c86cf714 | 8320 | Check_Compiler_Unit ("generalized indexing", N); |
e917e3b8 AC |
8321 | end if; |
8322 | ||
287aa0ed AC |
8323 | -- Create argument list for function call that represents generalized |
8324 | -- indexing. Note that indices (i.e. actuals) may themselves be | |
8325 | -- overloaded. | |
8326 | ||
50878404 | 8327 | declare |
287aa0ed AC |
8328 | Arg : Node_Id; |
8329 | New_Arg : Node_Id; | |
8330 | ||
50878404 AC |
8331 | begin |
8332 | Arg := First (Exprs); | |
8333 | while Present (Arg) loop | |
287aa0ed | 8334 | New_Arg := Relocate_Node (Arg); |
43151cfd ES |
8335 | |
8336 | -- The arguments can be parameter associations, in which case the | |
8337 | -- explicit actual parameter carries the overloadings. | |
8338 | ||
8339 | if Nkind (New_Arg) /= N_Parameter_Association then | |
8340 | Save_Interps (Arg, New_Arg); | |
8341 | end if; | |
8342 | ||
287aa0ed | 8343 | Append (New_Arg, Assoc); |
50878404 AC |
8344 | Next (Arg); |
8345 | end loop; | |
8346 | end; | |
8347 | ||
d50f4827 AC |
8348 | if not Is_Overloaded (Func_Name) then |
8349 | Func := Entity (Func_Name); | |
f4ef7b06 | 8350 | |
29ba9f52 RD |
8351 | Indexing := |
8352 | Make_Function_Call (Loc, | |
8353 | Name => New_Occurrence_Of (Func, Loc), | |
8354 | Parameter_Associations => Assoc); | |
f4ef7b06 | 8355 | |
5f50020a ES |
8356 | Set_Parent (Indexing, Parent (N)); |
8357 | Set_Generalized_Indexing (N, Indexing); | |
8358 | Analyze (Indexing); | |
8359 | Set_Etype (N, Etype (Indexing)); | |
d50f4827 | 8360 | |
76d49f49 ES |
8361 | -- If the return type of the indexing function is a reference type, |
8362 | -- add the dereference as a possible interpretation. Note that the | |
8363 | -- indexing aspect may be a function that returns the element type | |
5f50020a ES |
8364 | -- with no intervening implicit dereference, and that the reference |
8365 | -- discriminant is not the first discriminant. | |
76d49f49 ES |
8366 | |
8367 | if Has_Discriminants (Etype (Func)) then | |
71ff3d18 | 8368 | Check_Implicit_Dereference (N, Etype (Func)); |
76d49f49 | 8369 | end if; |
d50f4827 AC |
8370 | |
8371 | else | |
90b510e4 AC |
8372 | -- If there are multiple indexing functions, build a function call |
8373 | -- and analyze it for each of the possible interpretations. | |
8374 | ||
8b4230c8 AC |
8375 | Indexing := |
8376 | Make_Function_Call (Loc, | |
fa73fc3d AC |
8377 | Name => |
8378 | Make_Identifier (Loc, Chars (Func_Name)), | |
8b4230c8 | 8379 | Parameter_Associations => Assoc); |
5f50020a ES |
8380 | Set_Parent (Indexing, Parent (N)); |
8381 | Set_Generalized_Indexing (N, Indexing); | |
90b510e4 AC |
8382 | Set_Etype (N, Any_Type); |
8383 | Set_Etype (Name (Indexing), Any_Type); | |
d50f4827 AC |
8384 | |
8385 | declare | |
8b4230c8 AC |
8386 | I : Interp_Index; |
8387 | It : Interp; | |
d50f4827 AC |
8388 | Success : Boolean; |
8389 | ||
8390 | begin | |
8391 | Get_First_Interp (Func_Name, I, It); | |
5f50020a | 8392 | Set_Etype (Indexing, Any_Type); |
90b510e4 | 8393 | |
f4ef7b06 | 8394 | -- Analyze each candidate function with the given actuals |
0310af44 | 8395 | |
d50f4827 | 8396 | while Present (It.Nam) loop |
5f50020a | 8397 | Analyze_One_Call (Indexing, It.Nam, False, Success); |
0310af44 AC |
8398 | Get_Next_Interp (I, It); |
8399 | end loop; | |
32bba3c9 | 8400 | |
0310af44 AC |
8401 | -- If there are several successful candidates, resolution will |
8402 | -- be by result. Mark the interpretations of the function name | |
8403 | -- itself. | |
d50f4827 | 8404 | |
0310af44 AC |
8405 | if Is_Overloaded (Indexing) then |
8406 | Get_First_Interp (Indexing, I, It); | |
90b510e4 | 8407 | |
0310af44 | 8408 | while Present (It.Nam) loop |
90b510e4 | 8409 | Add_One_Interp (Name (Indexing), It.Nam, It.Typ); |
0310af44 AC |
8410 | Get_Next_Interp (I, It); |
8411 | end loop; | |
8412 | ||
8413 | else | |
8414 | Set_Etype (Name (Indexing), Etype (Indexing)); | |
8415 | end if; | |
8416 | ||
8417 | -- Now add the candidate interpretations to the indexing node | |
8418 | -- itself, to be replaced later by the function call. | |
8419 | ||
8420 | if Is_Overloaded (Name (Indexing)) then | |
8421 | Get_First_Interp (Name (Indexing), I, It); | |
8422 | ||
8423 | while Present (It.Nam) loop | |
90b510e4 AC |
8424 | Add_One_Interp (N, It.Nam, It.Typ); |
8425 | ||
6c7f7b8c AC |
8426 | -- Add dereference interpretation if the result type has |
8427 | -- implicit reference discriminants. | |
d50f4827 | 8428 | |
76d49f49 | 8429 | if Has_Discriminants (Etype (It.Nam)) then |
71ff3d18 | 8430 | Check_Implicit_Dereference (N, Etype (It.Nam)); |
76d49f49 | 8431 | end if; |
32bba3c9 | 8432 | |
0310af44 AC |
8433 | Get_Next_Interp (I, It); |
8434 | end loop; | |
8435 | ||
8436 | else | |
8437 | Set_Etype (N, Etype (Name (Indexing))); | |
8438 | if Has_Discriminants (Etype (N)) then | |
8439 | Check_Implicit_Dereference (N, Etype (N)); | |
8440 | end if; | |
8441 | end if; | |
d50f4827 AC |
8442 | end; |
8443 | end if; | |
8444 | ||
5f50020a | 8445 | if Etype (Indexing) = Any_Type then |
29ba9f52 RD |
8446 | Error_Msg_NE |
8447 | ("container cannot be indexed with&", N, Etype (First (Exprs))); | |
9ee76313 | 8448 | Rewrite (N, New_Occurrence_Of (Any_Id, Loc)); |
9ee76313 AC |
8449 | end if; |
8450 | ||
d50f4827 AC |
8451 | return True; |
8452 | end Try_Container_Indexing; | |
8453 | ||
996ae0b0 RK |
8454 | ----------------------- |
8455 | -- Try_Indirect_Call -- | |
8456 | ----------------------- | |
8457 | ||
8458 | function Try_Indirect_Call | |
91b1417d AC |
8459 | (N : Node_Id; |
8460 | Nam : Entity_Id; | |
8461 | Typ : Entity_Id) return Boolean | |
996ae0b0 | 8462 | is |
24657705 HK |
8463 | Actual : Node_Id; |
8464 | Formal : Entity_Id; | |
8465 | ||
8a7988f5 | 8466 | Call_OK : Boolean; |
24657705 | 8467 | pragma Warnings (Off, Call_OK); |
996ae0b0 RK |
8468 | |
8469 | begin | |
8a7988f5 | 8470 | Normalize_Actuals (N, Designated_Type (Typ), False, Call_OK); |
9de61fcb | 8471 | |
8a7988f5 | 8472 | Actual := First_Actual (N); |
fbf5a39b | 8473 | Formal := First_Formal (Designated_Type (Typ)); |
9de61fcb | 8474 | while Present (Actual) and then Present (Formal) loop |
996ae0b0 RK |
8475 | if not Has_Compatible_Type (Actual, Etype (Formal)) then |
8476 | return False; | |
8477 | end if; | |
8478 | ||
8479 | Next (Actual); | |
8480 | Next_Formal (Formal); | |
8481 | end loop; | |
8482 | ||
8483 | if No (Actual) and then No (Formal) then | |
8484 | Add_One_Interp (N, Nam, Etype (Designated_Type (Typ))); | |
8485 | ||
8486 | -- Nam is a candidate interpretation for the name in the call, | |
8487 | -- if it is not an indirect call. | |
8488 | ||
8489 | if not Is_Type (Nam) | |
8490 | and then Is_Entity_Name (Name (N)) | |
8491 | then | |
8492 | Set_Entity (Name (N), Nam); | |
8493 | end if; | |
8494 | ||
8495 | return True; | |
8b4230c8 | 8496 | |
996ae0b0 RK |
8497 | else |
8498 | return False; | |
8499 | end if; | |
8500 | end Try_Indirect_Call; | |
8501 | ||
8502 | ---------------------- | |
8503 | -- Try_Indexed_Call -- | |
8504 | ---------------------- | |
8505 | ||
8506 | function Try_Indexed_Call | |
aab883ec ES |
8507 | (N : Node_Id; |
8508 | Nam : Entity_Id; | |
8509 | Typ : Entity_Id; | |
8510 | Skip_First : Boolean) return Boolean | |
996ae0b0 | 8511 | is |
5ff22245 ES |
8512 | Loc : constant Source_Ptr := Sloc (N); |
8513 | Actuals : constant List_Id := Parameter_Associations (N); | |
8514 | Actual : Node_Id; | |
8515 | Index : Entity_Id; | |
996ae0b0 RK |
8516 | |
8517 | begin | |
fbf5a39b | 8518 | Actual := First (Actuals); |
aab883ec ES |
8519 | |
8520 | -- If the call was originally written in prefix form, skip the first | |
8521 | -- actual, which is obviously not defaulted. | |
8522 | ||
8523 | if Skip_First then | |
8524 | Next (Actual); | |
8525 | end if; | |
8526 | ||
fbf5a39b | 8527 | Index := First_Index (Typ); |
9de61fcb RD |
8528 | while Present (Actual) and then Present (Index) loop |
8529 | ||
996ae0b0 RK |
8530 | -- If the parameter list has a named association, the expression |
8531 | -- is definitely a call and not an indexed component. | |
8532 | ||
8533 | if Nkind (Actual) = N_Parameter_Association then | |
8534 | return False; | |
8535 | end if; | |
8536 | ||
5ff22245 ES |
8537 | if Is_Entity_Name (Actual) |
8538 | and then Is_Type (Entity (Actual)) | |
8539 | and then No (Next (Actual)) | |
8540 | then | |
1c218ac3 AC |
8541 | -- A single actual that is a type name indicates a slice if the |
8542 | -- type is discrete, and an error otherwise. | |
8543 | ||
8544 | if Is_Discrete_Type (Entity (Actual)) then | |
8545 | Rewrite (N, | |
8546 | Make_Slice (Loc, | |
22b77f68 RD |
8547 | Prefix => |
8548 | Make_Function_Call (Loc, | |
8549 | Name => Relocate_Node (Name (N))), | |
8550 | Discrete_Range => | |
1c218ac3 AC |
8551 | New_Occurrence_Of (Entity (Actual), Sloc (Actual)))); |
8552 | ||
8553 | Analyze (N); | |
8554 | ||
8555 | else | |
8556 | Error_Msg_N ("invalid use of type in expression", Actual); | |
8557 | Set_Etype (N, Any_Type); | |
8558 | end if; | |
5ff22245 | 8559 | |
5ff22245 ES |
8560 | return True; |
8561 | ||
8562 | elsif not Has_Compatible_Type (Actual, Etype (Index)) then | |
996ae0b0 RK |
8563 | return False; |
8564 | end if; | |
8565 | ||
8566 | Next (Actual); | |
8567 | Next_Index (Index); | |
8568 | end loop; | |
8569 | ||
8570 | if No (Actual) and then No (Index) then | |
8571 | Add_One_Interp (N, Nam, Component_Type (Typ)); | |
8572 | ||
8573 | -- Nam is a candidate interpretation for the name in the call, | |
8574 | -- if it is not an indirect call. | |
8575 | ||
8576 | if not Is_Type (Nam) | |
8577 | and then Is_Entity_Name (Name (N)) | |
8578 | then | |
8579 | Set_Entity (Name (N), Nam); | |
8580 | end if; | |
8581 | ||
8582 | return True; | |
8583 | else | |
8584 | return False; | |
8585 | end if; | |
996ae0b0 RK |
8586 | end Try_Indexed_Call; |
8587 | ||
35ae2ed8 AC |
8588 | -------------------------- |
8589 | -- Try_Object_Operation -- | |
8590 | -------------------------- | |
8591 | ||
8cf23b91 AC |
8592 | function Try_Object_Operation |
8593 | (N : Node_Id; CW_Test_Only : Boolean := False) return Boolean | |
8594 | is | |
b67a385c | 8595 | K : constant Node_Kind := Nkind (Parent (N)); |
d3b00ce3 | 8596 | Is_Subprg_Call : constant Boolean := K in N_Subprogram_Call; |
b67a385c | 8597 | Loc : constant Source_Ptr := Sloc (N); |
b67a385c | 8598 | Obj : constant Node_Id := Prefix (N); |
0d57c6f4 | 8599 | |
48c8c473 | 8600 | Subprog : constant Node_Id := |
0d57c6f4 RD |
8601 | Make_Identifier (Sloc (Selector_Name (N)), |
8602 | Chars => Chars (Selector_Name (N))); | |
401093c1 | 8603 | -- Identifier on which possible interpretations will be collected |
0a36105d | 8604 | |
b67a385c | 8605 | Report_Error : Boolean := False; |
8b4230c8 AC |
8606 | -- If no candidate interpretation matches the context, redo analysis |
8607 | -- with Report_Error True to provide additional information. | |
28d6470f JM |
8608 | |
8609 | Actual : Node_Id; | |
d469eabe | 8610 | Candidate : Entity_Id := Empty; |
48c8c473 | 8611 | New_Call_Node : Node_Id := Empty; |
4c46b835 | 8612 | Node_To_Replace : Node_Id; |
28d6470f | 8613 | Obj_Type : Entity_Id := Etype (Obj); |
48c8c473 | 8614 | Success : Boolean := False; |
0a36105d | 8615 | |
4c46b835 AC |
8616 | procedure Complete_Object_Operation |
8617 | (Call_Node : Node_Id; | |
0a36105d | 8618 | Node_To_Replace : Node_Id); |
ec6078e3 ES |
8619 | -- Make Subprog the name of Call_Node, replace Node_To_Replace with |
8620 | -- Call_Node, insert the object (or its dereference) as the first actual | |
8621 | -- in the call, and complete the analysis of the call. | |
4c46b835 | 8622 | |
0a36105d | 8623 | procedure Report_Ambiguity (Op : Entity_Id); |
48c8c473 AC |
8624 | -- If a prefixed procedure call is ambiguous, indicate whether the call |
8625 | -- includes an implicit dereference or an implicit 'Access. | |
0a36105d | 8626 | |
4c46b835 AC |
8627 | procedure Transform_Object_Operation |
8628 | (Call_Node : out Node_Id; | |
0a36105d | 8629 | Node_To_Replace : out Node_Id); |
0e3a687f | 8630 | -- Transform Obj.Operation (X, Y, ...) into Operation (Obj, X, Y ...). |
d469eabe HK |
8631 | -- Call_Node is the resulting subprogram call, Node_To_Replace is |
8632 | -- either N or the parent of N, and Subprog is a reference to the | |
8633 | -- subprogram we are trying to match. | |
35ae2ed8 AC |
8634 | |
8635 | function Try_Class_Wide_Operation | |
4c46b835 AC |
8636 | (Call_Node : Node_Id; |
8637 | Node_To_Replace : Node_Id) return Boolean; | |
48c8c473 AC |
8638 | -- Traverse all ancestor types looking for a class-wide subprogram for |
8639 | -- which the current operation is a valid non-dispatching call. | |
35ae2ed8 | 8640 | |
0a36105d JM |
8641 | procedure Try_One_Prefix_Interpretation (T : Entity_Id); |
8642 | -- If prefix is overloaded, its interpretation may include different | |
48c8c473 AC |
8643 | -- tagged types, and we must examine the primitive operations and the |
8644 | -- class-wide operations of each in order to find candidate | |
0a36105d JM |
8645 | -- interpretations for the call as a whole. |
8646 | ||
4c46b835 AC |
8647 | function Try_Primitive_Operation |
8648 | (Call_Node : Node_Id; | |
8649 | Node_To_Replace : Node_Id) return Boolean; | |
ec6078e3 | 8650 | -- Traverse the list of primitive subprograms looking for a dispatching |
48c8c473 | 8651 | -- operation for which the current node is a valid call. |
0a36105d JM |
8652 | |
8653 | function Valid_Candidate | |
8654 | (Success : Boolean; | |
8655 | Call : Node_Id; | |
48c8c473 AC |
8656 | Subp : Entity_Id) return Entity_Id; |
8657 | -- If the subprogram is a valid interpretation, record it, and add to | |
8658 | -- the list of interpretations of Subprog. Otherwise return Empty. | |
0a36105d | 8659 | |
4c46b835 AC |
8660 | ------------------------------- |
8661 | -- Complete_Object_Operation -- | |
8662 | ------------------------------- | |
8663 | ||
8664 | procedure Complete_Object_Operation | |
8665 | (Call_Node : Node_Id; | |
0a36105d | 8666 | Node_To_Replace : Node_Id) |
4c46b835 | 8667 | is |
b4592168 GD |
8668 | Control : constant Entity_Id := First_Formal (Entity (Subprog)); |
8669 | Formal_Type : constant Entity_Id := Etype (Control); | |
ec6078e3 ES |
8670 | First_Actual : Node_Id; |
8671 | ||
4c46b835 | 8672 | begin |
955871d3 AC |
8673 | -- Place the name of the operation, with its interpretations, |
8674 | -- on the rewritten call. | |
0a36105d | 8675 | |
ec6078e3 ES |
8676 | Set_Name (Call_Node, Subprog); |
8677 | ||
0a36105d JM |
8678 | First_Actual := First (Parameter_Associations (Call_Node)); |
8679 | ||
8b4230c8 AC |
8680 | -- For cross-reference purposes, treat the new node as being in the |
8681 | -- source if the original one is. Set entity and type, even though | |
8682 | -- they may be overwritten during resolution if overloaded. | |
b67a385c ES |
8683 | |
8684 | Set_Comes_From_Source (Subprog, Comes_From_Source (N)); | |
8685 | Set_Comes_From_Source (Call_Node, Comes_From_Source (N)); | |
8686 | ||
ec6078e3 | 8687 | if Nkind (N) = N_Selected_Component |
3d918396 | 8688 | and then not Inside_A_Generic |
ec6078e3 ES |
8689 | then |
8690 | Set_Entity (Selector_Name (N), Entity (Subprog)); | |
b2ab8c33 | 8691 | Set_Etype (Selector_Name (N), Etype (Entity (Subprog))); |
ec6078e3 ES |
8692 | end if; |
8693 | ||
8b4230c8 AC |
8694 | -- If need be, rewrite first actual as an explicit dereference. If |
8695 | -- the call is overloaded, the rewriting can only be done once the | |
8696 | -- primitive operation is identified. | |
0a36105d JM |
8697 | |
8698 | if Is_Overloaded (Subprog) then | |
ec6078e3 | 8699 | |
0a36105d JM |
8700 | -- The prefix itself may be overloaded, and its interpretations |
8701 | -- must be propagated to the new actual in the call. | |
8702 | ||
8703 | if Is_Overloaded (Obj) then | |
8704 | Save_Interps (Obj, First_Actual); | |
8705 | end if; | |
8706 | ||
8707 | Rewrite (First_Actual, Obj); | |
8708 | ||
8709 | elsif not Is_Access_Type (Formal_Type) | |
ec6078e3 ES |
8710 | and then Is_Access_Type (Etype (Obj)) |
8711 | then | |
8712 | Rewrite (First_Actual, | |
8713 | Make_Explicit_Dereference (Sloc (Obj), Obj)); | |
8714 | Analyze (First_Actual); | |
fe45e59e | 8715 | |
401093c1 ES |
8716 | -- If we need to introduce an explicit dereference, verify that |
8717 | -- the resulting actual is compatible with the mode of the formal. | |
8718 | ||
8719 | if Ekind (First_Formal (Entity (Subprog))) /= E_In_Parameter | |
8720 | and then Is_Access_Constant (Etype (Obj)) | |
8721 | then | |
8722 | Error_Msg_NE | |
8723 | ("expect variable in call to&", Prefix (N), Entity (Subprog)); | |
8724 | end if; | |
8725 | ||
2eda24e9 PMR |
8726 | -- Conversely, if the formal is an access parameter and the object is |
8727 | -- not an access type or a reference type (i.e. a type with the | |
8728 | -- Implicit_Dereference aspect specified), replace the actual with a | |
8729 | -- 'Access reference. Its analysis will check that the object is | |
8730 | -- aliased. | |
fe45e59e ES |
8731 | |
8732 | elsif Is_Access_Type (Formal_Type) | |
8733 | and then not Is_Access_Type (Etype (Obj)) | |
aa11d1dd PMR |
8734 | and then |
8735 | (not Has_Implicit_Dereference (Etype (Obj)) | |
8736 | or else | |
8737 | not Is_Access_Type (Designated_Type (Etype | |
8738 | (Get_Reference_Discriminant (Etype (Obj)))))) | |
fe45e59e | 8739 | then |
2eda24e9 | 8740 | -- A special case: A.all'Access is illegal if A is an access to a |
b4592168 GD |
8741 | -- constant and the context requires an access to a variable. |
8742 | ||
8743 | if not Is_Access_Constant (Formal_Type) then | |
8744 | if (Nkind (Obj) = N_Explicit_Dereference | |
8745 | and then Is_Access_Constant (Etype (Prefix (Obj)))) | |
8746 | or else not Is_Variable (Obj) | |
8747 | then | |
8748 | Error_Msg_NE | |
ad075b50 | 8749 | ("actual for & must be a variable", Obj, Control); |
b4592168 GD |
8750 | end if; |
8751 | end if; | |
8752 | ||
fe45e59e ES |
8753 | Rewrite (First_Actual, |
8754 | Make_Attribute_Reference (Loc, | |
8755 | Attribute_Name => Name_Access, | |
8756 | Prefix => Relocate_Node (Obj))); | |
0a36105d | 8757 | |
8f34c90b AC |
8758 | -- If the object is not overloaded verify that taking access of |
8759 | -- it is legal. Otherwise check is made during resolution. | |
8760 | ||
8761 | if not Is_Overloaded (Obj) | |
8762 | and then not Is_Aliased_View (Obj) | |
8763 | then | |
ed2233dc | 8764 | Error_Msg_NE |
ad075b50 | 8765 | ("object in prefixed call to & must be aliased " |
715e529d | 8766 | & "(RM 4.1.3 (13 1/2))", Prefix (First_Actual), Subprog); |
0a36105d JM |
8767 | end if; |
8768 | ||
fe45e59e ES |
8769 | Analyze (First_Actual); |
8770 | ||
ec6078e3 | 8771 | else |
0a36105d JM |
8772 | if Is_Overloaded (Obj) then |
8773 | Save_Interps (Obj, First_Actual); | |
8774 | end if; | |
ec6078e3 | 8775 | |
0a36105d | 8776 | Rewrite (First_Actual, Obj); |
aab883ec ES |
8777 | end if; |
8778 | ||
e699b76e AC |
8779 | -- The operation is obtained from the dispatch table and not by |
8780 | -- visibility, and may be declared in a unit that is not explicitly | |
8781 | -- referenced in the source, but is nevertheless required in the | |
8782 | -- context of the current unit. Indicate that operation and its scope | |
8783 | -- are referenced, to prevent spurious and misleading warnings. If | |
8784 | -- the operation is overloaded, all primitives are in the same scope | |
8785 | -- and we can use any of them. | |
8786 | ||
8787 | Set_Referenced (Entity (Subprog), True); | |
8788 | Set_Referenced (Scope (Entity (Subprog)), True); | |
8789 | ||
7ffd9312 | 8790 | Rewrite (Node_To_Replace, Call_Node); |
0a36105d JM |
8791 | |
8792 | -- Propagate the interpretations collected in subprog to the new | |
8793 | -- function call node, to be resolved from context. | |
8794 | ||
8795 | if Is_Overloaded (Subprog) then | |
8796 | Save_Interps (Subprog, Node_To_Replace); | |
7415029d | 8797 | |
0a36105d | 8798 | else |
28e18b4f AC |
8799 | -- The type of the subprogram may be a limited view obtained |
8800 | -- transitively from another unit. If full view is available, | |
c312b9f2 PMR |
8801 | -- use it to analyze call. If there is no nonlimited view, then |
8802 | -- this is diagnosed when analyzing the rewritten call. | |
28e18b4f AC |
8803 | |
8804 | declare | |
8805 | T : constant Entity_Id := Etype (Subprog); | |
8806 | begin | |
8807 | if From_Limited_With (T) then | |
8808 | Set_Etype (Entity (Subprog), Available_View (T)); | |
8809 | end if; | |
8810 | end; | |
8811 | ||
0a36105d | 8812 | Analyze (Node_To_Replace); |
438ff97c | 8813 | |
199c6a10 AC |
8814 | -- If the operation has been rewritten into a call, which may get |
8815 | -- subsequently an explicit dereference, preserve the type on the | |
8816 | -- original node (selected component or indexed component) for | |
8817 | -- subsequent legality tests, e.g. Is_Variable. which examines | |
8818 | -- the original node. | |
438ff97c ES |
8819 | |
8820 | if Nkind (Node_To_Replace) = N_Function_Call then | |
8821 | Set_Etype | |
8822 | (Original_Node (Node_To_Replace), Etype (Node_To_Replace)); | |
8823 | end if; | |
0a36105d | 8824 | end if; |
4c46b835 AC |
8825 | end Complete_Object_Operation; |
8826 | ||
0a36105d JM |
8827 | ---------------------- |
8828 | -- Report_Ambiguity -- | |
8829 | ---------------------- | |
8830 | ||
8831 | procedure Report_Ambiguity (Op : Entity_Id) is | |
0a36105d JM |
8832 | Access_Actual : constant Boolean := |
8833 | Is_Access_Type (Etype (Prefix (N))); | |
8cf23b91 | 8834 | Access_Formal : Boolean := False; |
0a36105d JM |
8835 | |
8836 | begin | |
8837 | Error_Msg_Sloc := Sloc (Op); | |
8838 | ||
8cf23b91 AC |
8839 | if Present (First_Formal (Op)) then |
8840 | Access_Formal := Is_Access_Type (Etype (First_Formal (Op))); | |
8841 | end if; | |
8842 | ||
0a36105d JM |
8843 | if Access_Formal and then not Access_Actual then |
8844 | if Nkind (Parent (Op)) = N_Full_Type_Declaration then | |
ed2233dc | 8845 | Error_Msg_N |
8b4230c8 AC |
8846 | ("\possible interpretation " |
8847 | & "(inherited, with implicit 'Access) #", N); | |
0a36105d | 8848 | else |
ed2233dc | 8849 | Error_Msg_N |
0a36105d JM |
8850 | ("\possible interpretation (with implicit 'Access) #", N); |
8851 | end if; | |
8852 | ||
8853 | elsif not Access_Formal and then Access_Actual then | |
8854 | if Nkind (Parent (Op)) = N_Full_Type_Declaration then | |
ed2233dc | 8855 | Error_Msg_N |
8b4230c8 | 8856 | ("\possible interpretation " |
28e18b4f | 8857 | & "(inherited, with implicit dereference) #", N); |
0a36105d | 8858 | else |
ed2233dc | 8859 | Error_Msg_N |
0a36105d JM |
8860 | ("\possible interpretation (with implicit dereference) #", N); |
8861 | end if; | |
8862 | ||
8863 | else | |
8864 | if Nkind (Parent (Op)) = N_Full_Type_Declaration then | |
ed2233dc | 8865 | Error_Msg_N ("\possible interpretation (inherited)#", N); |
0a36105d | 8866 | else |
4e7a4f6e AC |
8867 | Error_Msg_N -- CODEFIX |
8868 | ("\possible interpretation#", N); | |
0a36105d JM |
8869 | end if; |
8870 | end if; | |
8871 | end Report_Ambiguity; | |
8872 | ||
4c46b835 AC |
8873 | -------------------------------- |
8874 | -- Transform_Object_Operation -- | |
8875 | -------------------------------- | |
8876 | ||
8877 | procedure Transform_Object_Operation | |
8878 | (Call_Node : out Node_Id; | |
0a36105d | 8879 | Node_To_Replace : out Node_Id) |
35ae2ed8 | 8880 | is |
ec6078e3 ES |
8881 | Dummy : constant Node_Id := New_Copy (Obj); |
8882 | -- Placeholder used as a first parameter in the call, replaced | |
8883 | -- eventually by the proper object. | |
8884 | ||
d469eabe HK |
8885 | Parent_Node : constant Node_Id := Parent (N); |
8886 | ||
ec6078e3 | 8887 | Actual : Node_Id; |
d469eabe | 8888 | Actuals : List_Id; |
ec6078e3 | 8889 | |
35ae2ed8 | 8890 | begin |
40b4bc2d AC |
8891 | -- Obj may already have been rewritten if it involves an implicit |
8892 | -- dereference (e.g. if it is an access to a limited view). Preserve | |
8893 | -- a link to the original node for ASIS use. | |
8894 | ||
8895 | if not Comes_From_Source (Obj) then | |
8896 | Set_Original_Node (Dummy, Original_Node (Obj)); | |
8897 | end if; | |
8898 | ||
ec6078e3 ES |
8899 | -- Common case covering 1) Call to a procedure and 2) Call to a |
8900 | -- function that has some additional actuals. | |
35ae2ed8 | 8901 | |
d3b00ce3 | 8902 | if Nkind (Parent_Node) in N_Subprogram_Call |
35ae2ed8 | 8903 | |
ec6078e3 ES |
8904 | -- N is a selected component node containing the name of the |
8905 | -- subprogram. If N is not the name of the parent node we must | |
8906 | -- not replace the parent node by the new construct. This case | |
8907 | -- occurs when N is a parameterless call to a subprogram that | |
8908 | -- is an actual parameter of a call to another subprogram. For | |
8909 | -- example: | |
8910 | -- Some_Subprogram (..., Obj.Operation, ...) | |
35ae2ed8 | 8911 | |
ec6078e3 | 8912 | and then Name (Parent_Node) = N |
4c46b835 AC |
8913 | then |
8914 | Node_To_Replace := Parent_Node; | |
35ae2ed8 | 8915 | |
ec6078e3 | 8916 | Actuals := Parameter_Associations (Parent_Node); |
d3e65aad | 8917 | |
ec6078e3 ES |
8918 | if Present (Actuals) then |
8919 | Prepend (Dummy, Actuals); | |
8920 | else | |
8921 | Actuals := New_List (Dummy); | |
8922 | end if; | |
4c46b835 AC |
8923 | |
8924 | if Nkind (Parent_Node) = N_Procedure_Call_Statement then | |
8925 | Call_Node := | |
8926 | Make_Procedure_Call_Statement (Loc, | |
48c8c473 | 8927 | Name => New_Copy (Subprog), |
4c46b835 AC |
8928 | Parameter_Associations => Actuals); |
8929 | ||
8930 | else | |
4c46b835 AC |
8931 | Call_Node := |
8932 | Make_Function_Call (Loc, | |
8b4230c8 | 8933 | Name => New_Copy (Subprog), |
4c46b835 | 8934 | Parameter_Associations => Actuals); |
35ae2ed8 AC |
8935 | end if; |
8936 | ||
d469eabe | 8937 | -- Before analysis, a function call appears as an indexed component |
ec6078e3 | 8938 | -- if there are no named associations. |
758c442c | 8939 | |
c8307596 | 8940 | elsif Nkind (Parent_Node) = N_Indexed_Component |
ec6078e3 ES |
8941 | and then N = Prefix (Parent_Node) |
8942 | then | |
758c442c | 8943 | Node_To_Replace := Parent_Node; |
ec6078e3 ES |
8944 | Actuals := Expressions (Parent_Node); |
8945 | ||
8946 | Actual := First (Actuals); | |
8947 | while Present (Actual) loop | |
8948 | Analyze (Actual); | |
8949 | Next (Actual); | |
8950 | end loop; | |
8951 | ||
8952 | Prepend (Dummy, Actuals); | |
758c442c GD |
8953 | |
8954 | Call_Node := | |
8955 | Make_Function_Call (Loc, | |
8b4230c8 | 8956 | Name => New_Copy (Subprog), |
758c442c GD |
8957 | Parameter_Associations => Actuals); |
8958 | ||
d469eabe | 8959 | -- Parameterless call: Obj.F is rewritten as F (Obj) |
35ae2ed8 | 8960 | |
4c46b835 AC |
8961 | else |
8962 | Node_To_Replace := N; | |
8963 | ||
8964 | Call_Node := | |
8965 | Make_Function_Call (Loc, | |
8b4230c8 | 8966 | Name => New_Copy (Subprog), |
ec6078e3 | 8967 | Parameter_Associations => New_List (Dummy)); |
4c46b835 AC |
8968 | end if; |
8969 | end Transform_Object_Operation; | |
35ae2ed8 AC |
8970 | |
8971 | ------------------------------ | |
8972 | -- Try_Class_Wide_Operation -- | |
8973 | ------------------------------ | |
8974 | ||
8975 | function Try_Class_Wide_Operation | |
4c46b835 AC |
8976 | (Call_Node : Node_Id; |
8977 | Node_To_Replace : Node_Id) return Boolean | |
35ae2ed8 | 8978 | is |
0a36105d JM |
8979 | Anc_Type : Entity_Id; |
8980 | Matching_Op : Entity_Id := Empty; | |
8981 | Error : Boolean; | |
8982 | ||
8983 | procedure Traverse_Homonyms | |
8984 | (Anc_Type : Entity_Id; | |
8985 | Error : out Boolean); | |
8986 | -- Traverse the homonym chain of the subprogram searching for those | |
8987 | -- homonyms whose first formal has the Anc_Type's class-wide type, | |
d469eabe HK |
8988 | -- or an anonymous access type designating the class-wide type. If |
8989 | -- an ambiguity is detected, then Error is set to True. | |
0a36105d JM |
8990 | |
8991 | procedure Traverse_Interfaces | |
8992 | (Anc_Type : Entity_Id; | |
8993 | Error : out Boolean); | |
8994 | -- Traverse the list of interfaces, if any, associated with Anc_Type | |
8995 | -- and search for acceptable class-wide homonyms associated with each | |
8996 | -- interface. If an ambiguity is detected, then Error is set to True. | |
8997 | ||
8998 | ----------------------- | |
8999 | -- Traverse_Homonyms -- | |
9000 | ----------------------- | |
9001 | ||
9002 | procedure Traverse_Homonyms | |
9003 | (Anc_Type : Entity_Id; | |
9004 | Error : out Boolean) | |
9005 | is | |
118f2d8b | 9006 | function First_Formal_Match |
61770974 HK |
9007 | (Subp_Id : Entity_Id; |
9008 | Typ : Entity_Id) return Boolean; | |
9009 | -- Predicate to verify that the first foramal of class-wide | |
9010 | -- subprogram Subp_Id matches type Typ of the prefix. | |
118f2d8b ES |
9011 | |
9012 | ------------------------ | |
9013 | -- First_Formal_Match -- | |
9014 | ------------------------ | |
9015 | ||
9016 | function First_Formal_Match | |
61770974 HK |
9017 | (Subp_Id : Entity_Id; |
9018 | Typ : Entity_Id) return Boolean | |
118f2d8b | 9019 | is |
61770974 HK |
9020 | Ctrl : constant Entity_Id := First_Formal (Subp_Id); |
9021 | ||
118f2d8b | 9022 | begin |
61770974 HK |
9023 | return |
9024 | Present (Ctrl) | |
9025 | and then | |
9026 | (Base_Type (Etype (Ctrl)) = Typ | |
9027 | or else | |
9028 | (Ekind (Etype (Ctrl)) = E_Anonymous_Access_Type | |
9029 | and then | |
9030 | Base_Type (Designated_Type (Etype (Ctrl))) = | |
9031 | Typ)); | |
118f2d8b ES |
9032 | end First_Formal_Match; |
9033 | ||
61770974 | 9034 | -- Local variables |
ec6078e3 | 9035 | |
61770974 | 9036 | CW_Typ : constant Entity_Id := Class_Wide_Type (Anc_Type); |
b67a385c | 9037 | |
61770974 HK |
9038 | Candidate : Entity_Id; |
9039 | -- If homonym is a renaming, examine the renamed program | |
9040 | ||
9041 | Hom : Entity_Id; | |
9042 | Hom_Ref : Node_Id; | |
9043 | Success : Boolean; | |
9044 | ||
9045 | -- Start of processing for Traverse_Homonyms | |
9046 | ||
9047 | begin | |
9048 | Error := False; | |
401093c1 | 9049 | |
383e179e AC |
9050 | -- Find a non-hidden operation whose first parameter is of the |
9051 | -- class-wide type, a subtype thereof, or an anonymous access | |
a68d415b | 9052 | -- to same. If in an instance, the operation can be considered |
8b4230c8 AC |
9053 | -- even if hidden (it may be hidden because the instantiation |
9054 | -- is expanded after the containing package has been analyzed). | |
3bb9bd7d ES |
9055 | -- If the subprogram is a generic actual in an enclosing instance, |
9056 | -- it appears as a renaming that is a candidate interpretation as | |
9057 | -- well. | |
401093c1 | 9058 | |
61770974 | 9059 | Hom := Current_Entity (Subprog); |
35ae2ed8 | 9060 | while Present (Hom) loop |
6a2e4f0b | 9061 | if Ekind_In (Hom, E_Procedure, E_Function) |
118f2d8b ES |
9062 | and then Present (Renamed_Entity (Hom)) |
9063 | and then Is_Generic_Actual_Subprogram (Hom) | |
3bb9bd7d | 9064 | and then In_Open_Scopes (Scope (Hom)) |
118f2d8b ES |
9065 | then |
9066 | Candidate := Renamed_Entity (Hom); | |
9067 | else | |
9068 | Candidate := Hom; | |
9069 | end if; | |
9070 | ||
61770974 | 9071 | if Ekind_In (Candidate, E_Function, E_Procedure) |
118f2d8b ES |
9072 | and then (not Is_Hidden (Candidate) or else In_Instance) |
9073 | and then Scope (Candidate) = Scope (Base_Type (Anc_Type)) | |
61770974 | 9074 | and then First_Formal_Match (Candidate, CW_Typ) |
35ae2ed8 | 9075 | then |
88f47280 AC |
9076 | -- If the context is a procedure call, ignore functions |
9077 | -- in the name of the call. | |
9078 | ||
118f2d8b | 9079 | if Ekind (Candidate) = E_Function |
88f47280 AC |
9080 | and then Nkind (Parent (N)) = N_Procedure_Call_Statement |
9081 | and then N = Name (Parent (N)) | |
9082 | then | |
9083 | goto Next_Hom; | |
11fa950b AC |
9084 | |
9085 | -- If the context is a function call, ignore procedures | |
9086 | -- in the name of the call. | |
9087 | ||
118f2d8b | 9088 | elsif Ekind (Candidate) = E_Procedure |
11fa950b AC |
9089 | and then Nkind (Parent (N)) /= N_Procedure_Call_Statement |
9090 | then | |
9091 | goto Next_Hom; | |
88f47280 AC |
9092 | end if; |
9093 | ||
61770974 | 9094 | Set_Etype (Call_Node, Any_Type); |
0a36105d JM |
9095 | Set_Is_Overloaded (Call_Node, False); |
9096 | Success := False; | |
4c46b835 | 9097 | |
0a36105d | 9098 | if No (Matching_Op) then |
118f2d8b | 9099 | Hom_Ref := New_Occurrence_Of (Candidate, Sloc (Subprog)); |
4c46b835 | 9100 | |
61770974 HK |
9101 | Set_Etype (Call_Node, Any_Type); |
9102 | Set_Name (Call_Node, Hom_Ref); | |
9103 | Set_Parent (Call_Node, Parent (Node_To_Replace)); | |
4c46b835 | 9104 | |
0a36105d JM |
9105 | Analyze_One_Call |
9106 | (N => Call_Node, | |
118f2d8b | 9107 | Nam => Candidate, |
0a36105d JM |
9108 | Report => Report_Error, |
9109 | Success => Success, | |
9110 | Skip_First => True); | |
4c46b835 | 9111 | |
0a36105d | 9112 | Matching_Op := |
118f2d8b | 9113 | Valid_Candidate (Success, Call_Node, Candidate); |
4c46b835 | 9114 | |
0a36105d JM |
9115 | else |
9116 | Analyze_One_Call | |
9117 | (N => Call_Node, | |
118f2d8b | 9118 | Nam => Candidate, |
0a36105d JM |
9119 | Report => Report_Error, |
9120 | Success => Success, | |
9121 | Skip_First => True); | |
9122 | ||
15529d0a PMR |
9123 | -- The same operation may be encountered on two homonym |
9124 | -- traversals, before and after looking at interfaces. | |
9125 | -- Check for this case before reporting a real ambiguity. | |
9126 | ||
118f2d8b | 9127 | if Present |
61770974 | 9128 | (Valid_Candidate (Success, Call_Node, Candidate)) |
0a36105d | 9129 | and then Nkind (Call_Node) /= N_Function_Call |
118f2d8b | 9130 | and then Candidate /= Matching_Op |
0a36105d | 9131 | then |
ed2233dc | 9132 | Error_Msg_NE ("ambiguous call to&", N, Hom); |
0a36105d JM |
9133 | Report_Ambiguity (Matching_Op); |
9134 | Report_Ambiguity (Hom); | |
9135 | Error := True; | |
9136 | return; | |
9137 | end if; | |
35ae2ed8 AC |
9138 | end if; |
9139 | end if; | |
9140 | ||
88f47280 AC |
9141 | <<Next_Hom>> |
9142 | Hom := Homonym (Hom); | |
35ae2ed8 | 9143 | end loop; |
0a36105d JM |
9144 | end Traverse_Homonyms; |
9145 | ||
9146 | ------------------------- | |
9147 | -- Traverse_Interfaces -- | |
9148 | ------------------------- | |
35ae2ed8 | 9149 | |
0a36105d JM |
9150 | procedure Traverse_Interfaces |
9151 | (Anc_Type : Entity_Id; | |
9152 | Error : out Boolean) | |
9153 | is | |
0a36105d JM |
9154 | Intface_List : constant List_Id := |
9155 | Abstract_Interface_List (Anc_Type); | |
d469eabe | 9156 | Intface : Node_Id; |
0a36105d JM |
9157 | |
9158 | begin | |
9159 | Error := False; | |
9160 | ||
9161 | if Is_Non_Empty_List (Intface_List) then | |
9162 | Intface := First (Intface_List); | |
9163 | while Present (Intface) loop | |
9164 | ||
9165 | -- Look for acceptable class-wide homonyms associated with | |
9166 | -- the interface. | |
9167 | ||
9168 | Traverse_Homonyms (Etype (Intface), Error); | |
9169 | ||
9170 | if Error then | |
9171 | return; | |
9172 | end if; | |
9173 | ||
9174 | -- Continue the search by looking at each of the interface's | |
9175 | -- associated interface ancestors. | |
9176 | ||
9177 | Traverse_Interfaces (Etype (Intface), Error); | |
9178 | ||
9179 | if Error then | |
9180 | return; | |
9181 | end if; | |
9182 | ||
9183 | Next (Intface); | |
9184 | end loop; | |
9185 | end if; | |
9186 | end Traverse_Interfaces; | |
9187 | ||
9188 | -- Start of processing for Try_Class_Wide_Operation | |
9189 | ||
9190 | begin | |
8cf23b91 AC |
9191 | -- If we are searching only for conflicting class-wide subprograms |
9192 | -- then initialize directly Matching_Op with the target entity. | |
9193 | ||
9194 | if CW_Test_Only then | |
9195 | Matching_Op := Entity (Selector_Name (N)); | |
9196 | end if; | |
9197 | ||
d469eabe HK |
9198 | -- Loop through ancestor types (including interfaces), traversing |
9199 | -- the homonym chain of the subprogram, trying out those homonyms | |
9200 | -- whose first formal has the class-wide type of the ancestor, or | |
9201 | -- an anonymous access type designating the class-wide type. | |
0a36105d JM |
9202 | |
9203 | Anc_Type := Obj_Type; | |
9204 | loop | |
9205 | -- Look for a match among homonyms associated with the ancestor | |
9206 | ||
9207 | Traverse_Homonyms (Anc_Type, Error); | |
9208 | ||
9209 | if Error then | |
9210 | return True; | |
9211 | end if; | |
9212 | ||
9213 | -- Continue the search for matches among homonyms associated with | |
9214 | -- any interfaces implemented by the ancestor. | |
9215 | ||
9216 | Traverse_Interfaces (Anc_Type, Error); | |
9217 | ||
9218 | if Error then | |
9219 | return True; | |
9220 | end if; | |
35ae2ed8 | 9221 | |
4c46b835 AC |
9222 | exit when Etype (Anc_Type) = Anc_Type; |
9223 | Anc_Type := Etype (Anc_Type); | |
35ae2ed8 AC |
9224 | end loop; |
9225 | ||
0a36105d JM |
9226 | if Present (Matching_Op) then |
9227 | Set_Etype (Call_Node, Etype (Matching_Op)); | |
9228 | end if; | |
ec6078e3 | 9229 | |
0a36105d | 9230 | return Present (Matching_Op); |
35ae2ed8 AC |
9231 | end Try_Class_Wide_Operation; |
9232 | ||
0a36105d JM |
9233 | ----------------------------------- |
9234 | -- Try_One_Prefix_Interpretation -- | |
9235 | ----------------------------------- | |
9236 | ||
9237 | procedure Try_One_Prefix_Interpretation (T : Entity_Id) is | |
48c8c473 | 9238 | Prev_Obj_Type : constant Entity_Id := Obj_Type; |
e3d9f448 AC |
9239 | -- If the interpretation does not have a valid candidate type, |
9240 | -- preserve current value of Obj_Type for subsequent errors. | |
9241 | ||
0a36105d JM |
9242 | begin |
9243 | Obj_Type := T; | |
9244 | ||
9245 | if Is_Access_Type (Obj_Type) then | |
9246 | Obj_Type := Designated_Type (Obj_Type); | |
9247 | end if; | |
9248 | ||
48c8c473 AC |
9249 | if Ekind_In (Obj_Type, E_Private_Subtype, |
9250 | E_Record_Subtype_With_Private) | |
9251 | then | |
0a36105d JM |
9252 | Obj_Type := Base_Type (Obj_Type); |
9253 | end if; | |
9254 | ||
9255 | if Is_Class_Wide_Type (Obj_Type) then | |
9256 | Obj_Type := Etype (Class_Wide_Type (Obj_Type)); | |
9257 | end if; | |
9258 | ||
9259 | -- The type may have be obtained through a limited_with clause, | |
9260 | -- in which case the primitive operations are available on its | |
a316b3fc | 9261 | -- nonlimited view. If still incomplete, retrieve full view. |
0a36105d JM |
9262 | |
9263 | if Ekind (Obj_Type) = E_Incomplete_Type | |
7b56a91b | 9264 | and then From_Limited_With (Obj_Type) |
47346923 | 9265 | and then Has_Non_Limited_View (Obj_Type) |
0a36105d | 9266 | then |
401093c1 | 9267 | Obj_Type := Get_Full_View (Non_Limited_View (Obj_Type)); |
0a36105d JM |
9268 | end if; |
9269 | ||
9270 | -- If the object is not tagged, or the type is still an incomplete | |
48c8c473 AC |
9271 | -- type, this is not a prefixed call. Restore the previous type as |
9272 | -- the current one is not a legal candidate. | |
0a36105d JM |
9273 | |
9274 | if not Is_Tagged_Type (Obj_Type) | |
9275 | or else Is_Incomplete_Type (Obj_Type) | |
9276 | then | |
e3d9f448 | 9277 | Obj_Type := Prev_Obj_Type; |
0a36105d JM |
9278 | return; |
9279 | end if; | |
9280 | ||
11fa950b AC |
9281 | declare |
9282 | Dup_Call_Node : constant Node_Id := New_Copy (New_Call_Node); | |
5612989e PMR |
9283 | Ignore : Boolean; |
9284 | Prim_Result : Boolean := False; | |
11fa950b AC |
9285 | |
9286 | begin | |
8cf23b91 AC |
9287 | if not CW_Test_Only then |
9288 | Prim_Result := | |
9289 | Try_Primitive_Operation | |
9290 | (Call_Node => New_Call_Node, | |
9291 | Node_To_Replace => Node_To_Replace); | |
9292 | end if; | |
11fa950b AC |
9293 | |
9294 | -- Check if there is a class-wide subprogram covering the | |
9295 | -- primitive. This check must be done even if a candidate | |
9296 | -- was found in order to report ambiguous calls. | |
9297 | ||
48c8c473 | 9298 | if not Prim_Result then |
5612989e | 9299 | Ignore := |
11fa950b AC |
9300 | Try_Class_Wide_Operation |
9301 | (Call_Node => New_Call_Node, | |
9302 | Node_To_Replace => Node_To_Replace); | |
9303 | ||
9304 | -- If we found a primitive we search for class-wide subprograms | |
9305 | -- using a duplicate of the call node (done to avoid missing its | |
9306 | -- decoration if there is no ambiguity). | |
9307 | ||
9308 | else | |
5612989e | 9309 | Ignore := |
11fa950b AC |
9310 | Try_Class_Wide_Operation |
9311 | (Call_Node => Dup_Call_Node, | |
9312 | Node_To_Replace => Node_To_Replace); | |
9313 | end if; | |
9314 | end; | |
0a36105d JM |
9315 | end Try_One_Prefix_Interpretation; |
9316 | ||
4c46b835 AC |
9317 | ----------------------------- |
9318 | -- Try_Primitive_Operation -- | |
9319 | ----------------------------- | |
35ae2ed8 | 9320 | |
4c46b835 AC |
9321 | function Try_Primitive_Operation |
9322 | (Call_Node : Node_Id; | |
9323 | Node_To_Replace : Node_Id) return Boolean | |
35ae2ed8 | 9324 | is |
6e73e3ab AC |
9325 | Elmt : Elmt_Id; |
9326 | Prim_Op : Entity_Id; | |
0a36105d JM |
9327 | Matching_Op : Entity_Id := Empty; |
9328 | Prim_Op_Ref : Node_Id := Empty; | |
9329 | ||
8b4230c8 | 9330 | Corr_Type : Entity_Id := Empty; |
0a36105d JM |
9331 | -- If the prefix is a synchronized type, the controlling type of |
9332 | -- the primitive operation is the corresponding record type, else | |
9333 | -- this is the object type itself. | |
9334 | ||
8b4230c8 | 9335 | Success : Boolean := False; |
35ae2ed8 | 9336 | |
401093c1 ES |
9337 | function Collect_Generic_Type_Ops (T : Entity_Id) return Elist_Id; |
9338 | -- For tagged types the candidate interpretations are found in | |
9339 | -- the list of primitive operations of the type and its ancestors. | |
9340 | -- For formal tagged types we have to find the operations declared | |
9341 | -- in the same scope as the type (including in the generic formal | |
9342 | -- part) because the type itself carries no primitive operations, | |
9343 | -- except for formal derived types that inherit the operations of | |
9344 | -- the parent and progenitors. | |
8b4230c8 | 9345 | -- |
d469eabe HK |
9346 | -- If the context is a generic subprogram body, the generic formals |
9347 | -- are visible by name, but are not in the entity list of the | |
9348 | -- subprogram because that list starts with the subprogram formals. | |
9349 | -- We retrieve the candidate operations from the generic declaration. | |
401093c1 | 9350 | |
84dad556 AC |
9351 | function Extended_Primitive_Ops (T : Entity_Id) return Elist_Id; |
9352 | -- Prefix notation can also be used on operations that are not | |
9353 | -- primitives of the type, but are declared in the same immediate | |
9354 | -- declarative part, which can only mean the corresponding package | |
0e3a687f | 9355 | -- body (see RM 4.1.3 (9.2/3)). If we are in that body we extend the |
84dad556 AC |
9356 | -- list of primitives with body operations with the same name that |
9357 | -- may be candidates, so that Try_Primitive_Operations can examine | |
9358 | -- them if no real primitive is found. | |
9359 | ||
dfcfdc0a AC |
9360 | function Is_Private_Overriding (Op : Entity_Id) return Boolean; |
9361 | -- An operation that overrides an inherited operation in the private | |
9362 | -- part of its package may be hidden, but if the inherited operation | |
9363 | -- is visible a direct call to it will dispatch to the private one, | |
9364 | -- which is therefore a valid candidate. | |
9365 | ||
42f11e4c AC |
9366 | function Names_Match |
9367 | (Obj_Type : Entity_Id; | |
9368 | Prim_Op : Entity_Id; | |
9369 | Subprog : Entity_Id) return Boolean; | |
9370 | -- Return True if the names of Prim_Op and Subprog match. If Obj_Type | |
9371 | -- is a protected type then compare also the original name of Prim_Op | |
9372 | -- with the name of Subprog (since the expander may have added a | |
9373 | -- prefix to its original name --see Exp_Ch9.Build_Selected_Name). | |
9374 | ||
ec6078e3 ES |
9375 | function Valid_First_Argument_Of (Op : Entity_Id) return Boolean; |
9376 | -- Verify that the prefix, dereferenced if need be, is a valid | |
9377 | -- controlling argument in a call to Op. The remaining actuals | |
9378 | -- are checked in the subsequent call to Analyze_One_Call. | |
35ae2ed8 | 9379 | |
401093c1 ES |
9380 | ------------------------------ |
9381 | -- Collect_Generic_Type_Ops -- | |
9382 | ------------------------------ | |
9383 | ||
9384 | function Collect_Generic_Type_Ops (T : Entity_Id) return Elist_Id is | |
9385 | Bas : constant Entity_Id := Base_Type (T); | |
9386 | Candidates : constant Elist_Id := New_Elmt_List; | |
9387 | Subp : Entity_Id; | |
9388 | Formal : Entity_Id; | |
9389 | ||
d469eabe HK |
9390 | procedure Check_Candidate; |
9391 | -- The operation is a candidate if its first parameter is a | |
9392 | -- controlling operand of the desired type. | |
9393 | ||
9394 | ----------------------- | |
9395 | -- Check_Candidate; -- | |
9396 | ----------------------- | |
9397 | ||
9398 | procedure Check_Candidate is | |
9399 | begin | |
9400 | Formal := First_Formal (Subp); | |
9401 | ||
9402 | if Present (Formal) | |
9403 | and then Is_Controlling_Formal (Formal) | |
9404 | and then | |
9405 | (Base_Type (Etype (Formal)) = Bas | |
9406 | or else | |
9407 | (Is_Access_Type (Etype (Formal)) | |
9408 | and then Designated_Type (Etype (Formal)) = Bas)) | |
9409 | then | |
9410 | Append_Elmt (Subp, Candidates); | |
9411 | end if; | |
9412 | end Check_Candidate; | |
9413 | ||
9414 | -- Start of processing for Collect_Generic_Type_Ops | |
9415 | ||
401093c1 ES |
9416 | begin |
9417 | if Is_Derived_Type (T) then | |
9418 | return Primitive_Operations (T); | |
9419 | ||
bce79204 AC |
9420 | elsif Ekind_In (Scope (T), E_Procedure, E_Function) then |
9421 | ||
d469eabe HK |
9422 | -- Scan the list of generic formals to find subprograms |
9423 | -- that may have a first controlling formal of the type. | |
9424 | ||
8b4230c8 AC |
9425 | if Nkind (Unit_Declaration_Node (Scope (T))) = |
9426 | N_Generic_Subprogram_Declaration | |
bb10b891 AC |
9427 | then |
9428 | declare | |
9429 | Decl : Node_Id; | |
9430 | ||
9431 | begin | |
9432 | Decl := | |
9433 | First (Generic_Formal_Declarations | |
9434 | (Unit_Declaration_Node (Scope (T)))); | |
9435 | while Present (Decl) loop | |
9436 | if Nkind (Decl) in N_Formal_Subprogram_Declaration then | |
9437 | Subp := Defining_Entity (Decl); | |
9438 | Check_Candidate; | |
9439 | end if; | |
d469eabe | 9440 | |
bb10b891 AC |
9441 | Next (Decl); |
9442 | end loop; | |
9443 | end; | |
9444 | end if; | |
d469eabe HK |
9445 | return Candidates; |
9446 | ||
401093c1 ES |
9447 | else |
9448 | -- Scan the list of entities declared in the same scope as | |
9449 | -- the type. In general this will be an open scope, given that | |
9450 | -- the call we are analyzing can only appear within a generic | |
9451 | -- declaration or body (either the one that declares T, or a | |
9452 | -- child unit). | |
9453 | ||
bb10b891 AC |
9454 | -- For a subtype representing a generic actual type, go to the |
9455 | -- base type. | |
9456 | ||
9457 | if Is_Generic_Actual_Type (T) then | |
9458 | Subp := First_Entity (Scope (Base_Type (T))); | |
9459 | else | |
9460 | Subp := First_Entity (Scope (T)); | |
9461 | end if; | |
9462 | ||
401093c1 ES |
9463 | while Present (Subp) loop |
9464 | if Is_Overloadable (Subp) then | |
d469eabe | 9465 | Check_Candidate; |
401093c1 ES |
9466 | end if; |
9467 | ||
9468 | Next_Entity (Subp); | |
9469 | end loop; | |
9470 | ||
9471 | return Candidates; | |
9472 | end if; | |
9473 | end Collect_Generic_Type_Ops; | |
9474 | ||
84dad556 AC |
9475 | ---------------------------- |
9476 | -- Extended_Primitive_Ops -- | |
9477 | ---------------------------- | |
9478 | ||
9479 | function Extended_Primitive_Ops (T : Entity_Id) return Elist_Id is | |
9480 | Type_Scope : constant Entity_Id := Scope (T); | |
0e3a687f | 9481 | Op_List : Elist_Id := Primitive_Operations (T); |
84dad556 | 9482 | begin |
0e3a687f BD |
9483 | if Ekind_In (Type_Scope, E_Package, E_Generic_Package) |
9484 | and then ((In_Package_Body (Type_Scope) | |
9485 | and then In_Open_Scopes (Type_Scope)) or else In_Instance_Body) | |
84dad556 | 9486 | then |
0e3a687f | 9487 | -- Retrieve list of declarations of package body if possible |
84dad556 | 9488 | |
0e3a687f BD |
9489 | declare |
9490 | The_Body : constant Node_Id := | |
9491 | Corresponding_Body (Unit_Declaration_Node (Type_Scope)); | |
9492 | begin | |
9493 | if Present (The_Body) then | |
9494 | declare | |
9495 | Body_Decls : constant List_Id := | |
9496 | Declarations (Unit_Declaration_Node (The_Body)); | |
9497 | Op_Found : Boolean := False; | |
9498 | Op : Entity_Id := Current_Entity (Subprog); | |
9499 | begin | |
9500 | while Present (Op) loop | |
9501 | if Comes_From_Source (Op) | |
9502 | and then Is_Overloadable (Op) | |
9503 | ||
9504 | -- Exclude overriding primitive operations of a | |
9505 | -- type extension declared in the package body, | |
9506 | -- to prevent duplicates in extended list. | |
9507 | ||
9508 | and then not Is_Primitive (Op) | |
9509 | and then Is_List_Member | |
9510 | (Unit_Declaration_Node (Op)) | |
9511 | and then List_Containing | |
9512 | (Unit_Declaration_Node (Op)) = Body_Decls | |
9513 | then | |
9514 | if not Op_Found then | |
9515 | -- Copy list of primitives so it is not | |
9516 | -- affected for other uses. | |
84dad556 | 9517 | |
0e3a687f BD |
9518 | Op_List := New_Copy_Elist (Op_List); |
9519 | Op_Found := True; | |
9520 | end if; | |
84dad556 | 9521 | |
0e3a687f BD |
9522 | Append_Elmt (Op, Op_List); |
9523 | end if; | |
84dad556 | 9524 | |
0e3a687f BD |
9525 | Op := Homonym (Op); |
9526 | end loop; | |
9527 | end; | |
9528 | end if; | |
9529 | end; | |
84dad556 AC |
9530 | end if; |
9531 | ||
9532 | return Op_List; | |
9533 | end Extended_Primitive_Ops; | |
9534 | ||
dfcfdc0a AC |
9535 | --------------------------- |
9536 | -- Is_Private_Overriding -- | |
9537 | --------------------------- | |
9538 | ||
9539 | function Is_Private_Overriding (Op : Entity_Id) return Boolean is | |
40c21e91 | 9540 | Visible_Op : Entity_Id; |
dfcfdc0a AC |
9541 | |
9542 | begin | |
40c21e91 PMR |
9543 | -- The subprogram may be overloaded with both visible and private |
9544 | -- entities with the same name. We have to scan the chain of | |
9545 | -- homonyms to determine whether there is a previous implicit | |
9546 | -- declaration in the same scope that is overridden by the | |
9547 | -- private candidate. | |
9548 | ||
9549 | Visible_Op := Homonym (Op); | |
9550 | while Present (Visible_Op) loop | |
9551 | if Scope (Op) /= Scope (Visible_Op) then | |
9552 | return False; | |
9553 | ||
9554 | elsif not Comes_From_Source (Visible_Op) | |
9555 | and then Alias (Visible_Op) = Op | |
9556 | and then not Is_Hidden (Visible_Op) | |
9557 | then | |
9558 | return True; | |
9559 | end if; | |
9560 | ||
9561 | Visible_Op := Homonym (Visible_Op); | |
9562 | end loop; | |
9563 | ||
9564 | return False; | |
dfcfdc0a AC |
9565 | end Is_Private_Overriding; |
9566 | ||
42f11e4c AC |
9567 | ----------------- |
9568 | -- Names_Match -- | |
9569 | ----------------- | |
9570 | ||
9571 | function Names_Match | |
9572 | (Obj_Type : Entity_Id; | |
9573 | Prim_Op : Entity_Id; | |
9574 | Subprog : Entity_Id) return Boolean is | |
9575 | begin | |
9576 | -- Common case: exact match | |
9577 | ||
9578 | if Chars (Prim_Op) = Chars (Subprog) then | |
9579 | return True; | |
9580 | ||
9581 | -- For protected type primitives the expander may have built the | |
9582 | -- name of the dispatching primitive prepending the type name to | |
9583 | -- avoid conflicts with the name of the protected subprogram (see | |
9584 | -- Exp_Ch9.Build_Selected_Name). | |
9585 | ||
9586 | elsif Is_Protected_Type (Obj_Type) then | |
bac5ba15 AC |
9587 | return |
9588 | Present (Original_Protected_Subprogram (Prim_Op)) | |
9589 | and then Chars (Original_Protected_Subprogram (Prim_Op)) = | |
9590 | Chars (Subprog); | |
118f2d8b ES |
9591 | |
9592 | -- In an instance, the selector name may be a generic actual that | |
9593 | -- renames a primitive operation of the type of the prefix. | |
9594 | ||
9595 | elsif In_Instance and then Present (Current_Entity (Subprog)) then | |
9596 | declare | |
9597 | Subp : constant Entity_Id := Current_Entity (Subprog); | |
9598 | begin | |
9599 | if Present (Subp) | |
9600 | and then Is_Subprogram (Subp) | |
9601 | and then Present (Renamed_Entity (Subp)) | |
9602 | and then Is_Generic_Actual_Subprogram (Subp) | |
9603 | and then Chars (Renamed_Entity (Subp)) = Chars (Prim_Op) | |
9604 | then | |
9605 | return True; | |
9606 | end if; | |
9607 | end; | |
42f11e4c AC |
9608 | end if; |
9609 | ||
9610 | return False; | |
9611 | end Names_Match; | |
9612 | ||
ec6078e3 ES |
9613 | ----------------------------- |
9614 | -- Valid_First_Argument_Of -- | |
9615 | ----------------------------- | |
35ae2ed8 | 9616 | |
ec6078e3 | 9617 | function Valid_First_Argument_Of (Op : Entity_Id) return Boolean is |
9febb58f | 9618 | Typ : Entity_Id := Etype (First_Formal (Op)); |
35ae2ed8 | 9619 | |
ec6078e3 | 9620 | begin |
9febb58f JM |
9621 | if Is_Concurrent_Type (Typ) |
9622 | and then Present (Corresponding_Record_Type (Typ)) | |
9623 | then | |
9624 | Typ := Corresponding_Record_Type (Typ); | |
9625 | end if; | |
9626 | ||
9313a26a AC |
9627 | -- Simple case. Object may be a subtype of the tagged type or may |
9628 | -- be the corresponding record of a synchronized type. | |
5d09245e | 9629 | |
aab883ec | 9630 | return Obj_Type = Typ |
d469eabe | 9631 | or else Base_Type (Obj_Type) = Typ |
0a36105d JM |
9632 | or else Corr_Type = Typ |
9633 | ||
913e4b36 | 9634 | -- Object may be of a derived type whose parent has unknown |
9313a26a AC |
9635 | -- discriminants, in which case the type matches the underlying |
9636 | -- record view of its base. | |
913e4b36 | 9637 | |
9313a26a AC |
9638 | or else |
9639 | (Has_Unknown_Discriminants (Typ) | |
9640 | and then Typ = Underlying_Record_View (Base_Type (Obj_Type))) | |
913e4b36 | 9641 | |
0a36105d | 9642 | -- Prefix can be dereferenced |
725e2a15 | 9643 | |
ec6078e3 | 9644 | or else |
0a36105d JM |
9645 | (Is_Access_Type (Corr_Type) |
9646 | and then Designated_Type (Corr_Type) = Typ) | |
5d09245e | 9647 | |
9313a26a AC |
9648 | -- Formal is an access parameter, for which the object can |
9649 | -- provide an access. | |
35ae2ed8 | 9650 | |
ec6078e3 ES |
9651 | or else |
9652 | (Ekind (Typ) = E_Anonymous_Access_Type | |
9fde638d RD |
9653 | and then |
9654 | Base_Type (Designated_Type (Typ)) = Base_Type (Corr_Type)); | |
ec6078e3 | 9655 | end Valid_First_Argument_Of; |
35ae2ed8 | 9656 | |
ec6078e3 | 9657 | -- Start of processing for Try_Primitive_Operation |
35ae2ed8 | 9658 | |
ec6078e3 | 9659 | begin |
d469eabe | 9660 | -- Look for subprograms in the list of primitive operations. The name |
0a36105d JM |
9661 | -- must be identical, and the kind of call indicates the expected |
9662 | -- kind of operation (function or procedure). If the type is a | |
d469eabe | 9663 | -- (tagged) synchronized type, the primitive ops are attached to the |
b4592168 | 9664 | -- corresponding record (base) type. |
aab883ec ES |
9665 | |
9666 | if Is_Concurrent_Type (Obj_Type) then | |
bb10b891 AC |
9667 | if Present (Corresponding_Record_Type (Obj_Type)) then |
9668 | Corr_Type := Base_Type (Corresponding_Record_Type (Obj_Type)); | |
48c8c473 | 9669 | Elmt := First_Elmt (Primitive_Operations (Corr_Type)); |
bb10b891 AC |
9670 | else |
9671 | Corr_Type := Obj_Type; | |
48c8c473 | 9672 | Elmt := First_Elmt (Collect_Generic_Type_Ops (Obj_Type)); |
15e4986c JM |
9673 | end if; |
9674 | ||
401093c1 | 9675 | elsif not Is_Generic_Type (Obj_Type) then |
0a36105d | 9676 | Corr_Type := Obj_Type; |
48c8c473 | 9677 | Elmt := First_Elmt (Extended_Primitive_Ops (Obj_Type)); |
401093c1 ES |
9678 | |
9679 | else | |
9680 | Corr_Type := Obj_Type; | |
48c8c473 | 9681 | Elmt := First_Elmt (Collect_Generic_Type_Ops (Obj_Type)); |
aab883ec | 9682 | end if; |
35ae2ed8 | 9683 | |
ec6078e3 ES |
9684 | while Present (Elmt) loop |
9685 | Prim_Op := Node (Elmt); | |
9686 | ||
42f11e4c | 9687 | if Names_Match (Obj_Type, Prim_Op, Subprog) |
ec6078e3 ES |
9688 | and then Present (First_Formal (Prim_Op)) |
9689 | and then Valid_First_Argument_Of (Prim_Op) | |
fe45e59e | 9690 | and then |
7415029d | 9691 | (Nkind (Call_Node) = N_Function_Call) |
48c8c473 | 9692 | = |
8b4230c8 | 9693 | (Ekind (Prim_Op) = E_Function) |
ec6078e3 | 9694 | then |
b67a385c | 9695 | -- Ada 2005 (AI-251): If this primitive operation corresponds |
8b4230c8 | 9696 | -- to an immediate ancestor interface there is no need to add |
b67a385c ES |
9697 | -- it to the list of interpretations; the corresponding aliased |
9698 | -- primitive is also in this list of primitive operations and | |
9699 | -- will be used instead. | |
fe45e59e | 9700 | |
ce2b6ba5 JM |
9701 | if (Present (Interface_Alias (Prim_Op)) |
9702 | and then Is_Ancestor (Find_Dispatching_Type | |
9703 | (Alias (Prim_Op)), Corr_Type)) | |
0a36105d | 9704 | |
dfcfdc0a AC |
9705 | -- Do not consider hidden primitives unless the type is in an |
9706 | -- open scope or we are within an instance, where visibility | |
9707 | -- is known to be correct, or else if this is an overriding | |
9708 | -- operation in the private part for an inherited operation. | |
0a36105d | 9709 | |
dfcfdc0a AC |
9710 | or else (Is_Hidden (Prim_Op) |
9711 | and then not Is_Immediately_Visible (Obj_Type) | |
9712 | and then not In_Instance | |
9713 | and then not Is_Private_Overriding (Prim_Op)) | |
fe45e59e ES |
9714 | then |
9715 | goto Continue; | |
9716 | end if; | |
9717 | ||
0a36105d JM |
9718 | Set_Etype (Call_Node, Any_Type); |
9719 | Set_Is_Overloaded (Call_Node, False); | |
9720 | ||
9721 | if No (Matching_Op) then | |
e4494292 | 9722 | Prim_Op_Ref := New_Occurrence_Of (Prim_Op, Sloc (Subprog)); |
b67a385c | 9723 | Candidate := Prim_Op; |
35ae2ed8 | 9724 | |
fe45e59e | 9725 | Set_Parent (Call_Node, Parent (Node_To_Replace)); |
35ae2ed8 | 9726 | |
fe45e59e | 9727 | Set_Name (Call_Node, Prim_Op_Ref); |
0a36105d | 9728 | Success := False; |
35ae2ed8 | 9729 | |
fe45e59e ES |
9730 | Analyze_One_Call |
9731 | (N => Call_Node, | |
9732 | Nam => Prim_Op, | |
b67a385c | 9733 | Report => Report_Error, |
fe45e59e ES |
9734 | Success => Success, |
9735 | Skip_First => True); | |
35ae2ed8 | 9736 | |
0a36105d | 9737 | Matching_Op := Valid_Candidate (Success, Call_Node, Prim_Op); |
fe45e59e | 9738 | |
d469eabe HK |
9739 | -- More than one interpretation, collect for subsequent |
9740 | -- disambiguation. If this is a procedure call and there | |
9741 | -- is another match, report ambiguity now. | |
0a36105d | 9742 | |
d469eabe | 9743 | else |
0a36105d JM |
9744 | Analyze_One_Call |
9745 | (N => Call_Node, | |
9746 | Nam => Prim_Op, | |
9747 | Report => Report_Error, | |
9748 | Success => Success, | |
9749 | Skip_First => True); | |
fe45e59e | 9750 | |
0a36105d JM |
9751 | if Present (Valid_Candidate (Success, Call_Node, Prim_Op)) |
9752 | and then Nkind (Call_Node) /= N_Function_Call | |
9753 | then | |
ed2233dc | 9754 | Error_Msg_NE ("ambiguous call to&", N, Prim_Op); |
0a36105d JM |
9755 | Report_Ambiguity (Matching_Op); |
9756 | Report_Ambiguity (Prim_Op); | |
9757 | return True; | |
9758 | end if; | |
4c46b835 AC |
9759 | end if; |
9760 | end if; | |
35ae2ed8 | 9761 | |
fe45e59e | 9762 | <<Continue>> |
4c46b835 AC |
9763 | Next_Elmt (Elmt); |
9764 | end loop; | |
35ae2ed8 | 9765 | |
0a36105d JM |
9766 | if Present (Matching_Op) then |
9767 | Set_Etype (Call_Node, Etype (Matching_Op)); | |
fe45e59e ES |
9768 | end if; |
9769 | ||
0a36105d | 9770 | return Present (Matching_Op); |
4c46b835 | 9771 | end Try_Primitive_Operation; |
35ae2ed8 | 9772 | |
48c8c473 AC |
9773 | --------------------- |
9774 | -- Valid_Candidate -- | |
9775 | --------------------- | |
9776 | ||
9777 | function Valid_Candidate | |
9778 | (Success : Boolean; | |
9779 | Call : Node_Id; | |
9780 | Subp : Entity_Id) return Entity_Id | |
9781 | is | |
9782 | Arr_Type : Entity_Id; | |
9783 | Comp_Type : Entity_Id; | |
9784 | ||
9785 | begin | |
9786 | -- If the subprogram is a valid interpretation, record it in global | |
9787 | -- variable Subprog, to collect all possible overloadings. | |
9788 | ||
9789 | if Success then | |
9790 | if Subp /= Entity (Subprog) then | |
9791 | Add_One_Interp (Subprog, Subp, Etype (Subp)); | |
9792 | end if; | |
9793 | end if; | |
9794 | ||
9795 | -- If the call may be an indexed call, retrieve component type of | |
9796 | -- resulting expression, and add possible interpretation. | |
9797 | ||
9798 | Arr_Type := Empty; | |
9799 | Comp_Type := Empty; | |
9800 | ||
9801 | if Nkind (Call) = N_Function_Call | |
9802 | and then Nkind (Parent (N)) = N_Indexed_Component | |
9803 | and then Needs_One_Actual (Subp) | |
9804 | then | |
9805 | if Is_Array_Type (Etype (Subp)) then | |
9806 | Arr_Type := Etype (Subp); | |
9807 | ||
9808 | elsif Is_Access_Type (Etype (Subp)) | |
9809 | and then Is_Array_Type (Designated_Type (Etype (Subp))) | |
9810 | then | |
9811 | Arr_Type := Designated_Type (Etype (Subp)); | |
9812 | end if; | |
9813 | end if; | |
9814 | ||
9815 | if Present (Arr_Type) then | |
9816 | ||
9817 | -- Verify that the actuals (excluding the object) match the types | |
9818 | -- of the indexes. | |
9819 | ||
9820 | declare | |
9821 | Actual : Node_Id; | |
9822 | Index : Node_Id; | |
9823 | ||
9824 | begin | |
9825 | Actual := Next (First_Actual (Call)); | |
9826 | Index := First_Index (Arr_Type); | |
9827 | while Present (Actual) and then Present (Index) loop | |
9828 | if not Has_Compatible_Type (Actual, Etype (Index)) then | |
9829 | Arr_Type := Empty; | |
9830 | exit; | |
9831 | end if; | |
9832 | ||
9833 | Next_Actual (Actual); | |
9834 | Next_Index (Index); | |
9835 | end loop; | |
9836 | ||
9837 | if No (Actual) | |
9838 | and then No (Index) | |
9839 | and then Present (Arr_Type) | |
9840 | then | |
9841 | Comp_Type := Component_Type (Arr_Type); | |
9842 | end if; | |
9843 | end; | |
9844 | ||
9845 | if Present (Comp_Type) | |
9846 | and then Etype (Subprog) /= Comp_Type | |
9847 | then | |
9848 | Add_One_Interp (Subprog, Subp, Comp_Type); | |
9849 | end if; | |
9850 | end if; | |
9851 | ||
9852 | if Etype (Call) /= Any_Type then | |
9853 | return Subp; | |
9854 | else | |
9855 | return Empty; | |
9856 | end if; | |
9857 | end Valid_Candidate; | |
9858 | ||
4c46b835 | 9859 | -- Start of processing for Try_Object_Operation |
35ae2ed8 | 9860 | |
4c46b835 | 9861 | begin |
0a36105d | 9862 | Analyze_Expression (Obj); |
ec6078e3 | 9863 | |
0a36105d | 9864 | -- Analyze the actuals if node is known to be a subprogram call |
28d6470f JM |
9865 | |
9866 | if Is_Subprg_Call and then N = Name (Parent (N)) then | |
9867 | Actual := First (Parameter_Associations (Parent (N))); | |
9868 | while Present (Actual) loop | |
725e2a15 | 9869 | Analyze_Expression (Actual); |
28d6470f JM |
9870 | Next (Actual); |
9871 | end loop; | |
9872 | end if; | |
5d09245e | 9873 | |
ec6078e3 ES |
9874 | -- Build a subprogram call node, using a copy of Obj as its first |
9875 | -- actual. This is a placeholder, to be replaced by an explicit | |
9876 | -- dereference when needed. | |
4c46b835 | 9877 | |
ec6078e3 ES |
9878 | Transform_Object_Operation |
9879 | (Call_Node => New_Call_Node, | |
0a36105d | 9880 | Node_To_Replace => Node_To_Replace); |
4c46b835 | 9881 | |
ec6078e3 | 9882 | Set_Etype (New_Call_Node, Any_Type); |
0a36105d | 9883 | Set_Etype (Subprog, Any_Type); |
ec6078e3 | 9884 | Set_Parent (New_Call_Node, Parent (Node_To_Replace)); |
4c46b835 | 9885 | |
0a36105d JM |
9886 | if not Is_Overloaded (Obj) then |
9887 | Try_One_Prefix_Interpretation (Obj_Type); | |
ec6078e3 | 9888 | |
0a36105d JM |
9889 | else |
9890 | declare | |
9891 | I : Interp_Index; | |
9892 | It : Interp; | |
9893 | begin | |
9894 | Get_First_Interp (Obj, I, It); | |
9895 | while Present (It.Nam) loop | |
9896 | Try_One_Prefix_Interpretation (It.Typ); | |
9897 | Get_Next_Interp (I, It); | |
9898 | end loop; | |
9899 | end; | |
9900 | end if; | |
9901 | ||
9902 | if Etype (New_Call_Node) /= Any_Type then | |
8cf23b91 AC |
9903 | |
9904 | -- No need to complete the tree transformations if we are only | |
9905 | -- searching for conflicting class-wide subprograms | |
9906 | ||
9907 | if CW_Test_Only then | |
9908 | return False; | |
9909 | else | |
9910 | Complete_Object_Operation | |
9911 | (Call_Node => New_Call_Node, | |
9912 | Node_To_Replace => Node_To_Replace); | |
9913 | return True; | |
9914 | end if; | |
b67a385c ES |
9915 | |
9916 | elsif Present (Candidate) then | |
9917 | ||
9918 | -- The argument list is not type correct. Re-analyze with error | |
9919 | -- reporting enabled, and use one of the possible candidates. | |
d469eabe | 9920 | -- In All_Errors_Mode, re-analyze all failed interpretations. |
b67a385c ES |
9921 | |
9922 | if All_Errors_Mode then | |
9923 | Report_Error := True; | |
9924 | if Try_Primitive_Operation | |
8b4230c8 AC |
9925 | (Call_Node => New_Call_Node, |
9926 | Node_To_Replace => Node_To_Replace) | |
b67a385c ES |
9927 | |
9928 | or else | |
9929 | Try_Class_Wide_Operation | |
9930 | (Call_Node => New_Call_Node, | |
9931 | Node_To_Replace => Node_To_Replace) | |
9932 | then | |
9933 | null; | |
9934 | end if; | |
9935 | ||
9936 | else | |
9937 | Analyze_One_Call | |
9938 | (N => New_Call_Node, | |
9939 | Nam => Candidate, | |
9940 | Report => True, | |
9941 | Success => Success, | |
9942 | Skip_First => True); | |
9943 | end if; | |
9944 | ||
d469eabe HK |
9945 | -- No need for further errors |
9946 | ||
9947 | return True; | |
b67a385c ES |
9948 | |
9949 | else | |
9950 | -- There was no candidate operation, so report it as an error | |
9951 | -- in the caller: Analyze_Selected_Component. | |
9952 | ||
9953 | return False; | |
9954 | end if; | |
35ae2ed8 AC |
9955 | end Try_Object_Operation; |
9956 | ||
b4592168 GD |
9957 | --------- |
9958 | -- wpo -- | |
9959 | --------- | |
9960 | ||
9961 | procedure wpo (T : Entity_Id) is | |
9962 | Op : Entity_Id; | |
9963 | E : Elmt_Id; | |
9964 | ||
9965 | begin | |
9966 | if not Is_Tagged_Type (T) then | |
9967 | return; | |
9968 | end if; | |
9969 | ||
9970 | E := First_Elmt (Primitive_Operations (Base_Type (T))); | |
9971 | while Present (E) loop | |
9972 | Op := Node (E); | |
9973 | Write_Int (Int (Op)); | |
9974 | Write_Str (" === "); | |
9975 | Write_Name (Chars (Op)); | |
9976 | Write_Str (" in "); | |
9977 | Write_Name (Chars (Scope (Op))); | |
9978 | Next_Elmt (E); | |
9979 | Write_Eol; | |
9980 | end loop; | |
9981 | end wpo; | |
9982 | ||
996ae0b0 | 9983 | end Sem_Ch4; |