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1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M . C H 8 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
8 | -- -- | |
1138cf59 | 9 | -- Copyright (C) 1992-2011, Free Software Foundation, Inc. -- |
996ae0b0 RK |
10 | -- -- |
11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
996ae0b0 RK |
14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
17 | -- for more details. You should have received a copy of the GNU General -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
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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. -- |
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23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
26 | with Atree; use Atree; | |
27 | with Debug; use Debug; | |
28 | with Einfo; use Einfo; | |
29 | with Elists; use Elists; | |
30 | with Errout; use Errout; | |
d239991f | 31 | with Exp_Tss; use Exp_Tss; |
996ae0b0 RK |
32 | with Exp_Util; use Exp_Util; |
33 | with Fname; use Fname; | |
34 | with Freeze; use Freeze; | |
16ca248a | 35 | with Impunit; use Impunit; |
996ae0b0 RK |
36 | with Lib; use Lib; |
37 | with Lib.Load; use Lib.Load; | |
38 | with Lib.Xref; use Lib.Xref; | |
39 | with Namet; use Namet; | |
294ccb21 | 40 | with Namet.Sp; use Namet.Sp; |
996ae0b0 RK |
41 | with Nlists; use Nlists; |
42 | with Nmake; use Nmake; | |
43 | with Opt; use Opt; | |
44 | with Output; use Output; | |
45 | with Restrict; use Restrict; | |
6e937c1c | 46 | with Rident; use Rident; |
996ae0b0 RK |
47 | with Rtsfind; use Rtsfind; |
48 | with Sem; use Sem; | |
a4100e55 | 49 | with Sem_Aux; use Sem_Aux; |
fbf5a39b | 50 | with Sem_Cat; use Sem_Cat; |
996ae0b0 RK |
51 | with Sem_Ch3; use Sem_Ch3; |
52 | with Sem_Ch4; use Sem_Ch4; | |
53 | with Sem_Ch6; use Sem_Ch6; | |
54 | with Sem_Ch12; use Sem_Ch12; | |
82c80734 | 55 | with Sem_Disp; use Sem_Disp; |
a77842bd | 56 | with Sem_Dist; use Sem_Dist; |
a2dc5812 | 57 | with Sem_Eval; use Sem_Eval; |
996ae0b0 RK |
58 | with Sem_Res; use Sem_Res; |
59 | with Sem_Util; use Sem_Util; | |
60 | with Sem_Type; use Sem_Type; | |
61 | with Stand; use Stand; | |
62 | with Sinfo; use Sinfo; | |
63 | with Sinfo.CN; use Sinfo.CN; | |
64 | with Snames; use Snames; | |
65 | with Style; use Style; | |
66 | with Table; | |
ddc1515a | 67 | with Targparm; use Targparm; |
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68 | with Tbuild; use Tbuild; |
69 | with Uintp; use Uintp; | |
70 | ||
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71 | package body Sem_Ch8 is |
72 | ||
73 | ------------------------------------ | |
74 | -- Visibility and Name Resolution -- | |
75 | ------------------------------------ | |
76 | ||
2c1b72d7 | 77 | -- This package handles name resolution and the collection of possible |
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78 | -- interpretations for overloaded names, prior to overload resolution. |
79 | ||
80 | -- Name resolution is the process that establishes a mapping between source | |
81 | -- identifiers and the entities they denote at each point in the program. | |
82 | -- Each entity is represented by a defining occurrence. Each identifier | |
83 | -- that denotes an entity points to the corresponding defining occurrence. | |
84 | -- This is the entity of the applied occurrence. Each occurrence holds | |
85 | -- an index into the names table, where source identifiers are stored. | |
86 | ||
87 | -- Each entry in the names table for an identifier or designator uses the | |
88 | -- Info pointer to hold a link to the currently visible entity that has | |
89 | -- this name (see subprograms Get_Name_Entity_Id and Set_Name_Entity_Id | |
90 | -- in package Sem_Util). The visibility is initialized at the beginning of | |
91 | -- semantic processing to make entities in package Standard immediately | |
92 | -- visible. The visibility table is used in a more subtle way when | |
93 | -- compiling subunits (see below). | |
94 | ||
95 | -- Entities that have the same name (i.e. homonyms) are chained. In the | |
96 | -- case of overloaded entities, this chain holds all the possible meanings | |
97 | -- of a given identifier. The process of overload resolution uses type | |
98 | -- information to select from this chain the unique meaning of a given | |
99 | -- identifier. | |
100 | ||
101 | -- Entities are also chained in their scope, through the Next_Entity link. | |
102 | -- As a consequence, the name space is organized as a sparse matrix, where | |
103 | -- each row corresponds to a scope, and each column to a source identifier. | |
104 | -- Open scopes, that is to say scopes currently being compiled, have their | |
105 | -- corresponding rows of entities in order, innermost scope first. | |
106 | ||
107 | -- The scopes of packages that are mentioned in context clauses appear in | |
108 | -- no particular order, interspersed among open scopes. This is because | |
109 | -- in the course of analyzing the context of a compilation, a package | |
110 | -- declaration is first an open scope, and subsequently an element of the | |
111 | -- context. If subunits or child units are present, a parent unit may | |
112 | -- appear under various guises at various times in the compilation. | |
113 | ||
114 | -- When the compilation of the innermost scope is complete, the entities | |
115 | -- defined therein are no longer visible. If the scope is not a package | |
116 | -- declaration, these entities are never visible subsequently, and can be | |
117 | -- removed from visibility chains. If the scope is a package declaration, | |
118 | -- its visible declarations may still be accessible. Therefore the entities | |
119 | -- defined in such a scope are left on the visibility chains, and only | |
120 | -- their visibility (immediately visibility or potential use-visibility) | |
121 | -- is affected. | |
122 | ||
123 | -- The ordering of homonyms on their chain does not necessarily follow | |
124 | -- the order of their corresponding scopes on the scope stack. For | |
125 | -- example, if package P and the enclosing scope both contain entities | |
126 | -- named E, then when compiling the package body the chain for E will | |
127 | -- hold the global entity first, and the local one (corresponding to | |
128 | -- the current inner scope) next. As a result, name resolution routines | |
129 | -- do not assume any relative ordering of the homonym chains, either | |
130 | -- for scope nesting or to order of appearance of context clauses. | |
131 | ||
132 | -- When compiling a child unit, entities in the parent scope are always | |
133 | -- immediately visible. When compiling the body of a child unit, private | |
134 | -- entities in the parent must also be made immediately visible. There | |
135 | -- are separate routines to make the visible and private declarations | |
136 | -- visible at various times (see package Sem_Ch7). | |
137 | ||
138 | -- +--------+ +-----+ | |
139 | -- | In use |-------->| EU1 |--------------------------> | |
140 | -- +--------+ +-----+ | |
141 | -- | | | |
142 | -- +--------+ +-----+ +-----+ | |
143 | -- | Stand. |---------------->| ES1 |--------------->| ES2 |---> | |
144 | -- +--------+ +-----+ +-----+ | |
145 | -- | | | |
146 | -- +---------+ | +-----+ | |
147 | -- | with'ed |------------------------------>| EW2 |---> | |
148 | -- +---------+ | +-----+ | |
149 | -- | | | |
150 | -- +--------+ +-----+ +-----+ | |
151 | -- | Scope2 |---------------->| E12 |--------------->| E22 |---> | |
152 | -- +--------+ +-----+ +-----+ | |
153 | -- | | | |
154 | -- +--------+ +-----+ +-----+ | |
155 | -- | Scope1 |---------------->| E11 |--------------->| E12 |---> | |
156 | -- +--------+ +-----+ +-----+ | |
157 | -- ^ | | | |
158 | -- | | | | |
159 | -- | +---------+ | | | |
160 | -- | | with'ed |-----------------------------------------> | |
161 | -- | +---------+ | | | |
162 | -- | | | | |
163 | -- Scope stack | | | |
164 | -- (innermost first) | | | |
165 | -- +----------------------------+ | |
166 | -- Names table => | Id1 | | | | Id2 | | |
167 | -- +----------------------------+ | |
168 | ||
169 | -- Name resolution must deal with several syntactic forms: simple names, | |
170 | -- qualified names, indexed names, and various forms of calls. | |
171 | ||
172 | -- Each identifier points to an entry in the names table. The resolution | |
173 | -- of a simple name consists in traversing the homonym chain, starting | |
174 | -- from the names table. If an entry is immediately visible, it is the one | |
fbf5a39b | 175 | -- designated by the identifier. If only potentially use-visible entities |
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176 | -- are on the chain, we must verify that they do not hide each other. If |
177 | -- the entity we find is overloadable, we collect all other overloadable | |
178 | -- entities on the chain as long as they are not hidden. | |
179 | -- | |
180 | -- To resolve expanded names, we must find the entity at the intersection | |
181 | -- of the entity chain for the scope (the prefix) and the homonym chain | |
182 | -- for the selector. In general, homonym chains will be much shorter than | |
183 | -- entity chains, so it is preferable to start from the names table as | |
184 | -- well. If the entity found is overloadable, we must collect all other | |
185 | -- interpretations that are defined in the scope denoted by the prefix. | |
186 | ||
187 | -- For records, protected types, and tasks, their local entities are | |
188 | -- removed from visibility chains on exit from the corresponding scope. | |
189 | -- From the outside, these entities are always accessed by selected | |
190 | -- notation, and the entity chain for the record type, protected type, | |
191 | -- etc. is traversed sequentially in order to find the designated entity. | |
192 | ||
193 | -- The discriminants of a type and the operations of a protected type or | |
194 | -- task are unchained on exit from the first view of the type, (such as | |
195 | -- a private or incomplete type declaration, or a protected type speci- | |
fbf5a39b | 196 | -- fication) and re-chained when compiling the second view. |
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197 | |
198 | -- In the case of operators, we do not make operators on derived types | |
199 | -- explicit. As a result, the notation P."+" may denote either a user- | |
200 | -- defined function with name "+", or else an implicit declaration of the | |
201 | -- operator "+" in package P. The resolution of expanded names always | |
202 | -- tries to resolve an operator name as such an implicitly defined entity, | |
203 | -- in addition to looking for explicit declarations. | |
204 | ||
205 | -- All forms of names that denote entities (simple names, expanded names, | |
206 | -- character literals in some cases) have a Entity attribute, which | |
207 | -- identifies the entity denoted by the name. | |
208 | ||
209 | --------------------- | |
210 | -- The Scope Stack -- | |
211 | --------------------- | |
212 | ||
213 | -- The Scope stack keeps track of the scopes currently been compiled. | |
214 | -- Every entity that contains declarations (including records) is placed | |
215 | -- on the scope stack while it is being processed, and removed at the end. | |
216 | -- Whenever a non-package scope is exited, the entities defined therein | |
217 | -- are removed from the visibility table, so that entities in outer scopes | |
218 | -- become visible (see previous description). On entry to Sem, the scope | |
219 | -- stack only contains the package Standard. As usual, subunits complicate | |
220 | -- this picture ever so slightly. | |
221 | ||
222 | -- The Rtsfind mechanism can force a call to Semantics while another | |
223 | -- compilation is in progress. The unit retrieved by Rtsfind must be | |
224 | -- compiled in its own context, and has no access to the visibility of | |
225 | -- the unit currently being compiled. The procedures Save_Scope_Stack and | |
226 | -- Restore_Scope_Stack make entities in current open scopes invisible | |
227 | -- before compiling the retrieved unit, and restore the compilation | |
228 | -- environment afterwards. | |
229 | ||
230 | ------------------------ | |
231 | -- Compiling subunits -- | |
232 | ------------------------ | |
233 | ||
16ca248a ES |
234 | -- Subunits must be compiled in the environment of the corresponding stub, |
235 | -- that is to say with the same visibility into the parent (and its | |
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236 | -- context) that is available at the point of the stub declaration, but |
237 | -- with the additional visibility provided by the context clause of the | |
238 | -- subunit itself. As a result, compilation of a subunit forces compilation | |
239 | -- of the parent (see description in lib-). At the point of the stub | |
16ca248a ES |
240 | -- declaration, Analyze is called recursively to compile the proper body of |
241 | -- the subunit, but without reinitializing the names table, nor the scope | |
242 | -- stack (i.e. standard is not pushed on the stack). In this fashion the | |
243 | -- context of the subunit is added to the context of the parent, and the | |
244 | -- subunit is compiled in the correct environment. Note that in the course | |
245 | -- of processing the context of a subunit, Standard will appear twice on | |
246 | -- the scope stack: once for the parent of the subunit, and once for the | |
247 | -- unit in the context clause being compiled. However, the two sets of | |
248 | -- entities are not linked by homonym chains, so that the compilation of | |
249 | -- any context unit happens in a fresh visibility environment. | |
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250 | |
251 | ------------------------------- | |
252 | -- Processing of USE Clauses -- | |
253 | ------------------------------- | |
254 | ||
255 | -- Every defining occurrence has a flag indicating if it is potentially use | |
256 | -- visible. Resolution of simple names examines this flag. The processing | |
257 | -- of use clauses consists in setting this flag on all visible entities | |
258 | -- defined in the corresponding package. On exit from the scope of the use | |
259 | -- clause, the corresponding flag must be reset. However, a package may | |
260 | -- appear in several nested use clauses (pathological but legal, alas!) | |
261 | -- which forces us to use a slightly more involved scheme: | |
262 | ||
263 | -- a) The defining occurrence for a package holds a flag -In_Use- to | |
264 | -- indicate that it is currently in the scope of a use clause. If a | |
44d6a706 | 265 | -- redundant use clause is encountered, then the corresponding occurrence |
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266 | -- of the package name is flagged -Redundant_Use-. |
267 | ||
268 | -- b) On exit from a scope, the use clauses in its declarative part are | |
269 | -- scanned. The visibility flag is reset in all entities declared in | |
270 | -- package named in a use clause, as long as the package is not flagged | |
271 | -- as being in a redundant use clause (in which case the outer use | |
272 | -- clause is still in effect, and the direct visibility of its entities | |
273 | -- must be retained). | |
274 | ||
275 | -- Note that entities are not removed from their homonym chains on exit | |
276 | -- from the package specification. A subsequent use clause does not need | |
277 | -- to rechain the visible entities, but only to establish their direct | |
278 | -- visibility. | |
279 | ||
280 | ----------------------------------- | |
281 | -- Handling private declarations -- | |
282 | ----------------------------------- | |
283 | ||
284 | -- The principle that each entity has a single defining occurrence clashes | |
285 | -- with the presence of two separate definitions for private types: the | |
286 | -- first is the private type declaration, and second is the full type | |
287 | -- declaration. It is important that all references to the type point to | |
44d6a706 | 288 | -- the same defining occurrence, namely the first one. To enforce the two |
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289 | -- separate views of the entity, the corresponding information is swapped |
290 | -- between the two declarations. Outside of the package, the defining | |
44d6a706 | 291 | -- occurrence only contains the private declaration information, while in |
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292 | -- the private part and the body of the package the defining occurrence |
293 | -- contains the full declaration. To simplify the swap, the defining | |
294 | -- occurrence that currently holds the private declaration points to the | |
44d6a706 | 295 | -- full declaration. During semantic processing the defining occurrence |
16ca248a ES |
296 | -- also points to a list of private dependents, that is to say access types |
297 | -- or composite types whose designated types or component types are | |
996ae0b0 RK |
298 | -- subtypes or derived types of the private type in question. After the |
299 | -- full declaration has been seen, the private dependents are updated to | |
300 | -- indicate that they have full definitions. | |
301 | ||
302 | ------------------------------------ | |
303 | -- Handling of Undefined Messages -- | |
304 | ------------------------------------ | |
305 | ||
306 | -- In normal mode, only the first use of an undefined identifier generates | |
307 | -- a message. The table Urefs is used to record error messages that have | |
308 | -- been issued so that second and subsequent ones do not generate further | |
309 | -- messages. However, the second reference causes text to be added to the | |
310 | -- original undefined message noting "(more references follow)". The | |
311 | -- full error list option (-gnatf) forces messages to be generated for | |
312 | -- every reference and disconnects the use of this table. | |
313 | ||
314 | type Uref_Entry is record | |
315 | Node : Node_Id; | |
316 | -- Node for identifier for which original message was posted. The | |
317 | -- Chars field of this identifier is used to detect later references | |
318 | -- to the same identifier. | |
319 | ||
320 | Err : Error_Msg_Id; | |
321 | -- Records error message Id of original undefined message. Reset to | |
322 | -- No_Error_Msg after the second occurrence, where it is used to add | |
323 | -- text to the original message as described above. | |
324 | ||
325 | Nvis : Boolean; | |
326 | -- Set if the message is not visible rather than undefined | |
327 | ||
328 | Loc : Source_Ptr; | |
329 | -- Records location of error message. Used to make sure that we do | |
330 | -- not consider a, b : undefined as two separate instances, which | |
331 | -- would otherwise happen, since the parser converts this sequence | |
332 | -- to a : undefined; b : undefined. | |
333 | ||
334 | end record; | |
335 | ||
336 | package Urefs is new Table.Table ( | |
337 | Table_Component_Type => Uref_Entry, | |
338 | Table_Index_Type => Nat, | |
339 | Table_Low_Bound => 1, | |
340 | Table_Initial => 10, | |
341 | Table_Increment => 100, | |
342 | Table_Name => "Urefs"); | |
343 | ||
344 | Candidate_Renaming : Entity_Id; | |
345 | -- Holds a candidate interpretation that appears in a subprogram renaming | |
346 | -- declaration and does not match the given specification, but matches at | |
347 | -- least on the first formal. Allows better error message when given | |
348 | -- specification omits defaulted parameters, a common error. | |
349 | ||
350 | ----------------------- | |
351 | -- Local Subprograms -- | |
352 | ----------------------- | |
353 | ||
354 | procedure Analyze_Generic_Renaming | |
355 | (N : Node_Id; | |
356 | K : Entity_Kind); | |
357 | -- Common processing for all three kinds of generic renaming declarations. | |
358 | -- Enter new name and indicate that it renames the generic unit. | |
359 | ||
360 | procedure Analyze_Renamed_Character | |
361 | (N : Node_Id; | |
362 | New_S : Entity_Id; | |
363 | Is_Body : Boolean); | |
364 | -- Renamed entity is given by a character literal, which must belong | |
365 | -- to the return type of the new entity. Is_Body indicates whether the | |
366 | -- declaration is a renaming_as_body. If the original declaration has | |
367 | -- already been frozen (because of an intervening body, e.g.) the body of | |
368 | -- the function must be built now. The same applies to the following | |
369 | -- various renaming procedures. | |
370 | ||
371 | procedure Analyze_Renamed_Dereference | |
372 | (N : Node_Id; | |
373 | New_S : Entity_Id; | |
374 | Is_Body : Boolean); | |
375 | -- Renamed entity is given by an explicit dereference. Prefix must be a | |
376 | -- conformant access_to_subprogram type. | |
377 | ||
378 | procedure Analyze_Renamed_Entry | |
379 | (N : Node_Id; | |
380 | New_S : Entity_Id; | |
381 | Is_Body : Boolean); | |
382 | -- If the renamed entity in a subprogram renaming is an entry or protected | |
383 | -- subprogram, build a body for the new entity whose only statement is a | |
384 | -- call to the renamed entity. | |
385 | ||
386 | procedure Analyze_Renamed_Family_Member | |
387 | (N : Node_Id; | |
388 | New_S : Entity_Id; | |
389 | Is_Body : Boolean); | |
390 | -- Used when the renamed entity is an indexed component. The prefix must | |
391 | -- denote an entry family. | |
392 | ||
294ccb21 RD |
393 | procedure Analyze_Renamed_Primitive_Operation |
394 | (N : Node_Id; | |
395 | New_S : Entity_Id; | |
396 | Is_Body : Boolean); | |
397 | -- If the renamed entity in a subprogram renaming is a primitive operation | |
398 | -- or a class-wide operation in prefix form, save the target object, which | |
399 | -- must be added to the list of actuals in any subsequent call. | |
400 | ||
fbf5a39b | 401 | function Applicable_Use (Pack_Name : Node_Id) return Boolean; |
c42bfef2 RD |
402 | -- Common code to Use_One_Package and Set_Use, to determine whether use |
403 | -- clause must be processed. Pack_Name is an entity name that references | |
404 | -- the package in question. | |
fbf5a39b | 405 | |
996ae0b0 | 406 | procedure Attribute_Renaming (N : Node_Id); |
4c8a5bb8 AC |
407 | -- Analyze renaming of attribute as subprogram. The renaming declaration N |
408 | -- is rewritten as a subprogram body that returns the attribute reference | |
996ae0b0 RK |
409 | -- applied to the formals of the function. |
410 | ||
4c484f40 | 411 | procedure Set_Entity_Or_Discriminal (N : Node_Id; E : Entity_Id); |
c42bfef2 RD |
412 | -- Set Entity, with style check if need be. For a discriminant reference, |
413 | -- replace by the corresponding discriminal, i.e. the parameter of the | |
414 | -- initialization procedure that corresponds to the discriminant. | |
4c484f40 | 415 | |
996ae0b0 RK |
416 | procedure Check_Frozen_Renaming (N : Node_Id; Subp : Entity_Id); |
417 | -- A renaming_as_body may occur after the entity of the original decla- | |
418 | -- ration has been frozen. In that case, the body of the new entity must | |
419 | -- be built now, because the usual mechanism of building the renamed | |
420 | -- body at the point of freezing will not work. Subp is the subprogram | |
421 | -- for which N provides the Renaming_As_Body. | |
422 | ||
fbf5a39b AC |
423 | procedure Check_In_Previous_With_Clause |
424 | (N : Node_Id; | |
425 | Nam : Node_Id); | |
426 | -- N is a use_package clause and Nam the package name, or N is a use_type | |
427 | -- clause and Nam is the prefix of the type name. In either case, verify | |
428 | -- that the package is visible at that point in the context: either it | |
429 | -- appears in a previous with_clause, or because it is a fully qualified | |
430 | -- name and the root ancestor appears in a previous with_clause. | |
431 | ||
996ae0b0 RK |
432 | procedure Check_Library_Unit_Renaming (N : Node_Id; Old_E : Entity_Id); |
433 | -- Verify that the entity in a renaming declaration that is a library unit | |
434 | -- is itself a library unit and not a nested unit or subunit. Also check | |
435 | -- that if the renaming is a child unit of a generic parent, then the | |
436 | -- renamed unit must also be a child unit of that parent. Finally, verify | |
437 | -- that a renamed generic unit is not an implicit child declared within | |
438 | -- an instance of the parent. | |
439 | ||
440 | procedure Chain_Use_Clause (N : Node_Id); | |
d4810530 ES |
441 | -- Chain use clause onto list of uses clauses headed by First_Use_Clause in |
442 | -- the proper scope table entry. This is usually the current scope, but it | |
443 | -- will be an inner scope when installing the use clauses of the private | |
444 | -- declarations of a parent unit prior to compiling the private part of a | |
445 | -- child unit. This chain is traversed when installing/removing use clauses | |
446 | -- when compiling a subunit or instantiating a generic body on the fly, | |
447 | -- when it is necessary to save and restore full environments. | |
996ae0b0 RK |
448 | |
449 | function Has_Implicit_Character_Literal (N : Node_Id) return Boolean; | |
450 | -- Find a type derived from Character or Wide_Character in the prefix of N. | |
451 | -- Used to resolved qualified names whose selector is a character literal. | |
452 | ||
9bc856dd | 453 | function Has_Private_With (E : Entity_Id) return Boolean; |
0ab80019 | 454 | -- Ada 2005 (AI-262): Determines if the current compilation unit has a |
cdc8c54c | 455 | -- private with on E. |
9bc856dd | 456 | |
fbf5a39b | 457 | procedure Find_Expanded_Name (N : Node_Id); |
1d801f21 | 458 | -- The input is a selected component known to be an expanded name. Verify |
30196a76 RD |
459 | -- legality of selector given the scope denoted by prefix, and change node |
460 | -- N into a expanded name with a properly set Entity field. | |
fbf5a39b | 461 | |
996ae0b0 RK |
462 | function Find_Renamed_Entity |
463 | (N : Node_Id; | |
464 | Nam : Node_Id; | |
465 | New_S : Entity_Id; | |
466 | Is_Actual : Boolean := False) return Entity_Id; | |
467 | -- Find the renamed entity that corresponds to the given parameter profile | |
468 | -- in a subprogram renaming declaration. The renamed entity may be an | |
469 | -- operator, a subprogram, an entry, or a protected operation. Is_Actual | |
470 | -- indicates that the renaming is the one generated for an actual subpro- | |
471 | -- gram in an instance, for which special visibility checks apply. | |
472 | ||
fbf5a39b | 473 | function Has_Implicit_Operator (N : Node_Id) return Boolean; |
f3d57416 | 474 | -- N is an expanded name whose selector is an operator name (e.g. P."+"). |
16ca248a ES |
475 | -- declarative part contains an implicit declaration of an operator if it |
476 | -- has a declaration of a type to which one of the predefined operators | |
477 | -- apply. The existence of this routine is an implementation artifact. A | |
478 | -- more straightforward but more space-consuming choice would be to make | |
479 | -- all inherited operators explicit in the symbol table. | |
fbf5a39b | 480 | |
996ae0b0 RK |
481 | procedure Inherit_Renamed_Profile (New_S : Entity_Id; Old_S : Entity_Id); |
482 | -- A subprogram defined by a renaming declaration inherits the parameter | |
483 | -- profile of the renamed entity. The subtypes given in the subprogram | |
484 | -- specification are discarded and replaced with those of the renamed | |
485 | -- subprogram, which are then used to recheck the default values. | |
486 | ||
fbf5a39b | 487 | function Is_Appropriate_For_Record (T : Entity_Id) return Boolean; |
16ca248a ES |
488 | -- Prefix is appropriate for record if it is of a record type, or an access |
489 | -- to such. | |
fbf5a39b AC |
490 | |
491 | function Is_Appropriate_For_Entry_Prefix (T : Entity_Id) return Boolean; | |
16ca248a ES |
492 | -- True if it is of a task type, a protected type, or else an access to one |
493 | -- of these types. | |
fbf5a39b | 494 | |
d4810530 | 495 | procedure Note_Redundant_Use (Clause : Node_Id); |
16ca248a ES |
496 | -- Mark the name in a use clause as redundant if the corresponding entity |
497 | -- is already use-visible. Emit a warning if the use clause comes from | |
498 | -- source and the proper warnings are enabled. | |
d4810530 | 499 | |
996ae0b0 | 500 | procedure Premature_Usage (N : Node_Id); |
bc41faa2 | 501 | -- Diagnose usage of an entity before it is visible |
996ae0b0 | 502 | |
fbf5a39b AC |
503 | procedure Use_One_Package (P : Entity_Id; N : Node_Id); |
504 | -- Make visible entities declared in package P potentially use-visible | |
505 | -- in the current context. Also used in the analysis of subunits, when | |
506 | -- re-installing use clauses of parent units. N is the use_clause that | |
507 | -- names P (and possibly other packages). | |
508 | ||
7ff2d234 | 509 | procedure Use_One_Type (Id : Node_Id; Installed : Boolean := False); |
fbf5a39b | 510 | -- Id is the subtype mark from a use type clause. This procedure makes |
7ff2d234 AC |
511 | -- the primitive operators of the type potentially use-visible. The |
512 | -- boolean flag Installed indicates that the clause is being reinstalled | |
513 | -- after previous analysis, and primitive operations are already chained | |
514 | -- on the Used_Operations list of the clause. | |
fbf5a39b | 515 | |
996ae0b0 RK |
516 | procedure Write_Info; |
517 | -- Write debugging information on entities declared in current scope | |
518 | ||
996ae0b0 RK |
519 | -------------------------------- |
520 | -- Analyze_Exception_Renaming -- | |
521 | -------------------------------- | |
522 | ||
16ca248a ES |
523 | -- The language only allows a single identifier, but the tree holds an |
524 | -- identifier list. The parser has already issued an error message if | |
525 | -- there is more than one element in the list. | |
996ae0b0 RK |
526 | |
527 | procedure Analyze_Exception_Renaming (N : Node_Id) is | |
528 | Id : constant Node_Id := Defining_Identifier (N); | |
529 | Nam : constant Node_Id := Name (N); | |
530 | ||
531 | begin | |
2ba431e5 | 532 | Check_SPARK_Restriction ("exception renaming is not allowed", N); |
1d801f21 | 533 | |
996ae0b0 RK |
534 | Enter_Name (Id); |
535 | Analyze (Nam); | |
536 | ||
537 | Set_Ekind (Id, E_Exception); | |
538 | Set_Exception_Code (Id, Uint_0); | |
539 | Set_Etype (Id, Standard_Exception_Type); | |
540 | Set_Is_Pure (Id, Is_Pure (Current_Scope)); | |
541 | ||
542 | if not Is_Entity_Name (Nam) or else | |
543 | Ekind (Entity (Nam)) /= E_Exception | |
544 | then | |
545 | Error_Msg_N ("invalid exception name in renaming", Nam); | |
546 | else | |
547 | if Present (Renamed_Object (Entity (Nam))) then | |
548 | Set_Renamed_Object (Id, Renamed_Object (Entity (Nam))); | |
549 | else | |
550 | Set_Renamed_Object (Id, Entity (Nam)); | |
551 | end if; | |
552 | end if; | |
553 | end Analyze_Exception_Renaming; | |
554 | ||
555 | --------------------------- | |
556 | -- Analyze_Expanded_Name -- | |
557 | --------------------------- | |
558 | ||
559 | procedure Analyze_Expanded_Name (N : Node_Id) is | |
560 | begin | |
16ca248a ES |
561 | -- If the entity pointer is already set, this is an internal node, or a |
562 | -- node that is analyzed more than once, after a tree modification. In | |
563 | -- such a case there is no resolution to perform, just set the type. For | |
564 | -- completeness, analyze prefix as well. | |
996ae0b0 RK |
565 | |
566 | if Present (Entity (N)) then | |
567 | if Is_Type (Entity (N)) then | |
568 | Set_Etype (N, Entity (N)); | |
569 | else | |
570 | Set_Etype (N, Etype (Entity (N))); | |
571 | end if; | |
572 | ||
573 | Analyze (Prefix (N)); | |
574 | return; | |
575 | else | |
576 | Find_Expanded_Name (N); | |
577 | end if; | |
578 | end Analyze_Expanded_Name; | |
579 | ||
15ce9ca2 AC |
580 | --------------------------------------- |
581 | -- Analyze_Generic_Function_Renaming -- | |
582 | --------------------------------------- | |
996ae0b0 RK |
583 | |
584 | procedure Analyze_Generic_Function_Renaming (N : Node_Id) is | |
585 | begin | |
586 | Analyze_Generic_Renaming (N, E_Generic_Function); | |
587 | end Analyze_Generic_Function_Renaming; | |
588 | ||
15ce9ca2 AC |
589 | -------------------------------------- |
590 | -- Analyze_Generic_Package_Renaming -- | |
591 | -------------------------------------- | |
996ae0b0 RK |
592 | |
593 | procedure Analyze_Generic_Package_Renaming (N : Node_Id) is | |
594 | begin | |
16ca248a ES |
595 | -- Apply the Text_IO Kludge here, since we may be renaming one of the |
596 | -- subpackages of Text_IO, then join common routine. | |
996ae0b0 RK |
597 | |
598 | Text_IO_Kludge (Name (N)); | |
599 | ||
600 | Analyze_Generic_Renaming (N, E_Generic_Package); | |
601 | end Analyze_Generic_Package_Renaming; | |
602 | ||
15ce9ca2 AC |
603 | ---------------------------------------- |
604 | -- Analyze_Generic_Procedure_Renaming -- | |
605 | ---------------------------------------- | |
996ae0b0 RK |
606 | |
607 | procedure Analyze_Generic_Procedure_Renaming (N : Node_Id) is | |
608 | begin | |
609 | Analyze_Generic_Renaming (N, E_Generic_Procedure); | |
610 | end Analyze_Generic_Procedure_Renaming; | |
611 | ||
612 | ------------------------------ | |
613 | -- Analyze_Generic_Renaming -- | |
614 | ------------------------------ | |
615 | ||
616 | procedure Analyze_Generic_Renaming | |
617 | (N : Node_Id; | |
618 | K : Entity_Kind) | |
619 | is | |
fbf5a39b | 620 | New_P : constant Entity_Id := Defining_Entity (N); |
996ae0b0 RK |
621 | Old_P : Entity_Id; |
622 | Inst : Boolean := False; -- prevent junk warning | |
623 | ||
624 | begin | |
ed4a1468 RD |
625 | if Name (N) = Error then |
626 | return; | |
627 | end if; | |
628 | ||
2ba431e5 | 629 | Check_SPARK_Restriction ("generic renaming is not allowed", N); |
fe5d3068 | 630 | |
996ae0b0 RK |
631 | Generate_Definition (New_P); |
632 | ||
633 | if Current_Scope /= Standard_Standard then | |
634 | Set_Is_Pure (New_P, Is_Pure (Current_Scope)); | |
635 | end if; | |
636 | ||
637 | if Nkind (Name (N)) = N_Selected_Component then | |
638 | Check_Generic_Child_Unit (Name (N), Inst); | |
639 | else | |
640 | Analyze (Name (N)); | |
641 | end if; | |
642 | ||
643 | if not Is_Entity_Name (Name (N)) then | |
644 | Error_Msg_N ("expect entity name in renaming declaration", Name (N)); | |
645 | Old_P := Any_Id; | |
646 | else | |
647 | Old_P := Entity (Name (N)); | |
648 | end if; | |
649 | ||
650 | Enter_Name (New_P); | |
651 | Set_Ekind (New_P, K); | |
652 | ||
653 | if Etype (Old_P) = Any_Type then | |
654 | null; | |
655 | ||
656 | elsif Ekind (Old_P) /= K then | |
657 | Error_Msg_N ("invalid generic unit name", Name (N)); | |
658 | ||
659 | else | |
660 | if Present (Renamed_Object (Old_P)) then | |
661 | Set_Renamed_Object (New_P, Renamed_Object (Old_P)); | |
662 | else | |
663 | Set_Renamed_Object (New_P, Old_P); | |
664 | end if; | |
665 | ||
923fa078 RD |
666 | Set_Is_Pure (New_P, Is_Pure (Old_P)); |
667 | Set_Is_Preelaborated (New_P, Is_Preelaborated (Old_P)); | |
668 | ||
996ae0b0 RK |
669 | Set_Etype (New_P, Etype (Old_P)); |
670 | Set_Has_Completion (New_P); | |
671 | ||
672 | if In_Open_Scopes (Old_P) then | |
673 | Error_Msg_N ("within its scope, generic denotes its instance", N); | |
674 | end if; | |
675 | ||
676 | Check_Library_Unit_Renaming (N, Old_P); | |
677 | end if; | |
996ae0b0 RK |
678 | end Analyze_Generic_Renaming; |
679 | ||
680 | ----------------------------- | |
681 | -- Analyze_Object_Renaming -- | |
682 | ----------------------------- | |
683 | ||
684 | procedure Analyze_Object_Renaming (N : Node_Id) is | |
1378bf10 AC |
685 | Loc : constant Source_Ptr := Sloc (N); |
686 | Id : constant Entity_Id := Defining_Identifier (N); | |
996ae0b0 | 687 | Dec : Node_Id; |
1378bf10 | 688 | Nam : constant Node_Id := Name (N); |
996ae0b0 RK |
689 | T : Entity_Id; |
690 | T2 : Entity_Id; | |
691 | ||
3f5a8fee AC |
692 | procedure Check_Constrained_Object; |
693 | -- If the nominal type is unconstrained but the renamed object is | |
694 | -- constrained, as can happen with renaming an explicit dereference or | |
695 | -- a function return, build a constrained subtype from the object. If | |
696 | -- the renaming is for a formal in an accept statement, the analysis | |
697 | -- has already established its actual subtype. This is only relevant | |
698 | -- if the renamed object is an explicit dereference. | |
699 | ||
923fa078 RD |
700 | function In_Generic_Scope (E : Entity_Id) return Boolean; |
701 | -- Determine whether entity E is inside a generic cope | |
702 | ||
3f5a8fee AC |
703 | ------------------------------ |
704 | -- Check_Constrained_Object -- | |
705 | ------------------------------ | |
706 | ||
707 | procedure Check_Constrained_Object is | |
3f5a8fee AC |
708 | Subt : Entity_Id; |
709 | ||
710 | begin | |
e917aec2 | 711 | if Nkind_In (Nam, N_Function_Call, N_Explicit_Dereference) |
3f5a8fee AC |
712 | and then Is_Composite_Type (Etype (Nam)) |
713 | and then not Is_Constrained (Etype (Nam)) | |
714 | and then not Has_Unknown_Discriminants (Etype (Nam)) | |
715 | and then Expander_Active | |
716 | then | |
e917aec2 | 717 | -- If Actual_Subtype is already set, nothing to do |
3f5a8fee | 718 | |
e917aec2 | 719 | if Ekind_In (Id, E_Variable, E_Constant) |
3f5a8fee AC |
720 | and then Present (Actual_Subtype (Id)) |
721 | then | |
722 | null; | |
723 | ||
724 | else | |
725 | Subt := Make_Temporary (Loc, 'T'); | |
726 | Remove_Side_Effects (Nam); | |
727 | Insert_Action (N, | |
728 | Make_Subtype_Declaration (Loc, | |
729 | Defining_Identifier => Subt, | |
730 | Subtype_Indication => | |
731 | Make_Subtype_From_Expr (Nam, Etype (Nam)))); | |
732 | Rewrite (Subtype_Mark (N), New_Occurrence_Of (Subt, Loc)); | |
733 | Set_Etype (Nam, Subt); | |
734 | end if; | |
735 | end if; | |
736 | end Check_Constrained_Object; | |
737 | ||
923fa078 RD |
738 | ---------------------- |
739 | -- In_Generic_Scope -- | |
740 | ---------------------- | |
741 | ||
742 | function In_Generic_Scope (E : Entity_Id) return Boolean is | |
743 | S : Entity_Id; | |
744 | ||
745 | begin | |
746 | S := Scope (E); | |
747 | while Present (S) and then S /= Standard_Standard loop | |
748 | if Is_Generic_Unit (S) then | |
749 | return True; | |
750 | end if; | |
751 | ||
752 | S := Scope (S); | |
753 | end loop; | |
754 | ||
755 | return False; | |
756 | end In_Generic_Scope; | |
757 | ||
758 | -- Start of processing for Analyze_Object_Renaming | |
759 | ||
996ae0b0 | 760 | begin |
ed4a1468 RD |
761 | if Nam = Error then |
762 | return; | |
763 | end if; | |
764 | ||
2ba431e5 | 765 | Check_SPARK_Restriction ("object renaming is not allowed", N); |
fe5d3068 | 766 | |
996ae0b0 RK |
767 | Set_Is_Pure (Id, Is_Pure (Current_Scope)); |
768 | Enter_Name (Id); | |
769 | ||
16ca248a ES |
770 | -- The renaming of a component that depends on a discriminant requires |
771 | -- an actual subtype, because in subsequent use of the object Gigi will | |
772 | -- be unable to locate the actual bounds. This explicit step is required | |
773 | -- when the renaming is generated in removing side effects of an | |
774 | -- already-analyzed expression. | |
996ae0b0 RK |
775 | |
776 | if Nkind (Nam) = N_Selected_Component | |
777 | and then Analyzed (Nam) | |
778 | then | |
779 | T := Etype (Nam); | |
780 | Dec := Build_Actual_Subtype_Of_Component (Etype (Nam), Nam); | |
781 | ||
782 | if Present (Dec) then | |
783 | Insert_Action (N, Dec); | |
784 | T := Defining_Identifier (Dec); | |
785 | Set_Etype (Nam, T); | |
786 | end if; | |
787 | ||
11560bcc | 788 | -- Complete analysis of the subtype mark in any case, for ASIS use |
fbe627af RD |
789 | |
790 | if Present (Subtype_Mark (N)) then | |
791 | Find_Type (Subtype_Mark (N)); | |
792 | end if; | |
793 | ||
6e937c1c AC |
794 | elsif Present (Subtype_Mark (N)) then |
795 | Find_Type (Subtype_Mark (N)); | |
796 | T := Entity (Subtype_Mark (N)); | |
fbe627af RD |
797 | Analyze (Nam); |
798 | ||
799 | if Nkind (Nam) = N_Type_Conversion | |
800 | and then not Is_Tagged_Type (T) | |
801 | then | |
802 | Error_Msg_N | |
803 | ("renaming of conversion only allowed for tagged types", Nam); | |
804 | end if; | |
805 | ||
806 | Resolve (Nam, T); | |
6e937c1c | 807 | |
1378bf10 AC |
808 | -- If the renamed object is a function call of a limited type, |
809 | -- the expansion of the renaming is complicated by the presence | |
810 | -- of various temporaries and subtypes that capture constraints | |
811 | -- of the renamed object. Rewrite node as an object declaration, | |
812 | -- whose expansion is simpler. Given that the object is limited | |
813 | -- there is no copy involved and no performance hit. | |
814 | ||
815 | if Nkind (Nam) = N_Function_Call | |
816 | and then Is_Immutably_Limited_Type (Etype (Nam)) | |
92db5dee | 817 | and then not Is_Constrained (Etype (Nam)) |
1378bf10 AC |
818 | and then Comes_From_Source (N) |
819 | then | |
820 | Set_Etype (Id, T); | |
821 | Set_Ekind (Id, E_Constant); | |
822 | Rewrite (N, | |
823 | Make_Object_Declaration (Loc, | |
824 | Defining_Identifier => Id, | |
825 | Constant_Present => True, | |
92db5dee | 826 | Object_Definition => New_Occurrence_Of (Etype (Nam), Loc), |
1378bf10 AC |
827 | Expression => Relocate_Node (Nam))); |
828 | return; | |
829 | end if; | |
830 | ||
7d823354 ES |
831 | -- Check that a class-wide object is not being renamed as an object |
832 | -- of a specific type. The test for access types is needed to exclude | |
833 | -- cases where the renamed object is a dynamically tagged access | |
834 | -- result, such as occurs in certain expansions. | |
835 | ||
4755cce9 JM |
836 | if Is_Tagged_Type (T) then |
837 | Check_Dynamically_Tagged_Expression | |
838 | (Expr => Nam, | |
839 | Typ => T, | |
840 | Related_Nod => N); | |
7d823354 ES |
841 | end if; |
842 | ||
0ab80019 | 843 | -- Ada 2005 (AI-230/AI-254): Access renaming |
6e937c1c | 844 | |
9bc856dd | 845 | else pragma Assert (Present (Access_Definition (N))); |
6e937c1c AC |
846 | T := Access_Definition |
847 | (Related_Nod => N, | |
848 | N => Access_Definition (N)); | |
35b7fa6a | 849 | |
f16d05d9 AC |
850 | Analyze (Nam); |
851 | ||
852 | -- Ada 2005 AI05-105: if the declaration has an anonymous access | |
853 | -- type, the renamed object must also have an anonymous type, and | |
92db5dee AC |
854 | -- this is a name resolution rule. This was implicit in the last part |
855 | -- of the first sentence in 8.5.1(3/2), and is made explicit by this | |
856 | -- recent AI. | |
f16d05d9 AC |
857 | |
858 | if not Is_Overloaded (Nam) then | |
859 | if Ekind (Etype (Nam)) /= Ekind (T) then | |
860 | Error_Msg_N | |
a2dc5812 | 861 | ("expect anonymous access type in object renaming", N); |
f16d05d9 | 862 | end if; |
3c19e9be | 863 | |
f16d05d9 AC |
864 | else |
865 | declare | |
3c19e9be ES |
866 | I : Interp_Index; |
867 | It : Interp; | |
868 | Typ : Entity_Id := Empty; | |
e34ca162 | 869 | Seen : Boolean := False; |
f16d05d9 AC |
870 | |
871 | begin | |
872 | Get_First_Interp (Nam, I, It); | |
873 | while Present (It.Typ) loop | |
3c19e9be ES |
874 | |
875 | -- Renaming is ambiguous if more than one candidate | |
876 | -- interpretation is type-conformant with the context. | |
877 | ||
878 | if Ekind (It.Typ) = Ekind (T) then | |
879 | if Ekind (T) = E_Anonymous_Access_Subprogram_Type | |
e34ca162 AC |
880 | and then |
881 | Type_Conformant | |
882 | (Designated_Type (T), Designated_Type (It.Typ)) | |
f16d05d9 | 883 | then |
3c19e9be ES |
884 | if not Seen then |
885 | Seen := True; | |
886 | else | |
887 | Error_Msg_N | |
888 | ("ambiguous expression in renaming", Nam); | |
889 | end if; | |
890 | ||
891 | elsif Ekind (T) = E_Anonymous_Access_Type | |
e34ca162 AC |
892 | and then |
893 | Covers (Designated_Type (T), Designated_Type (It.Typ)) | |
3c19e9be ES |
894 | then |
895 | if not Seen then | |
896 | Seen := True; | |
897 | else | |
898 | Error_Msg_N | |
899 | ("ambiguous expression in renaming", Nam); | |
900 | end if; | |
901 | end if; | |
902 | ||
903 | if Covers (T, It.Typ) then | |
f16d05d9 AC |
904 | Typ := It.Typ; |
905 | Set_Etype (Nam, Typ); | |
906 | Set_Is_Overloaded (Nam, False); | |
907 | end if; | |
f16d05d9 AC |
908 | end if; |
909 | ||
910 | Get_Next_Interp (I, It); | |
911 | end loop; | |
912 | end; | |
913 | end if; | |
914 | ||
915 | Resolve (Nam, T); | |
6e937c1c | 916 | |
0ab80019 | 917 | -- Ada 2005 (AI-231): "In the case where the type is defined by an |
0fb2ea01 AC |
918 | -- access_definition, the renamed entity shall be of an access-to- |
919 | -- constant type if and only if the access_definition defines an | |
920 | -- access-to-constant type" ARM 8.5.1(4) | |
35b7fa6a AC |
921 | |
922 | if Constant_Present (Access_Definition (N)) | |
923 | and then not Is_Access_Constant (Etype (Nam)) | |
924 | then | |
0ab80019 | 925 | Error_Msg_N ("(Ada 2005): the renamed object is not " |
11560bcc | 926 | & "access-to-constant (RM 8.5.1(6))", N); |
a2dc5812 AC |
927 | |
928 | elsif not Constant_Present (Access_Definition (N)) | |
929 | and then Is_Access_Constant (Etype (Nam)) | |
930 | then | |
931 | Error_Msg_N ("(Ada 2005): the renamed object is not " | |
932 | & "access-to-variable (RM 8.5.1(6))", N); | |
933 | end if; | |
934 | ||
935 | if Is_Access_Subprogram_Type (Etype (Nam)) then | |
936 | Check_Subtype_Conformant | |
937 | (Designated_Type (T), Designated_Type (Etype (Nam))); | |
938 | ||
939 | elsif not Subtypes_Statically_Match | |
df3e68b1 HK |
940 | (Designated_Type (T), |
941 | Available_View (Designated_Type (Etype (Nam)))) | |
a2dc5812 AC |
942 | then |
943 | Error_Msg_N | |
944 | ("subtype of renamed object does not statically match", N); | |
35b7fa6a | 945 | end if; |
996ae0b0 RK |
946 | end if; |
947 | ||
426d2717 AC |
948 | -- Special processing for renaming function return object. Some errors |
949 | -- and warnings are produced only for calls that come from source. | |
fbe627af | 950 | |
426d2717 | 951 | if Nkind (Nam) = N_Function_Call then |
fbe627af RD |
952 | case Ada_Version is |
953 | ||
954 | -- Usage is illegal in Ada 83 | |
955 | ||
956 | when Ada_83 => | |
426d2717 AC |
957 | if Comes_From_Source (Nam) then |
958 | Error_Msg_N | |
959 | ("(Ada 83) cannot rename function return object", Nam); | |
960 | end if; | |
fbe627af RD |
961 | |
962 | -- In Ada 95, warn for odd case of renaming parameterless function | |
426d2717 | 963 | -- call if this is not a limited type (where this is useful). |
fbe627af RD |
964 | |
965 | when others => | |
966 | if Warn_On_Object_Renames_Function | |
967 | and then No (Parameter_Associations (Nam)) | |
968 | and then not Is_Limited_Type (Etype (Nam)) | |
426d2717 | 969 | and then Comes_From_Source (Nam) |
fbe627af RD |
970 | then |
971 | Error_Msg_N | |
426d2717 | 972 | ("?renaming function result object is suspicious", Nam); |
fbe627af | 973 | Error_Msg_NE |
426d2717 AC |
974 | ("\?function & will be called only once", Nam, |
975 | Entity (Name (Nam))); | |
ed2233dc | 976 | Error_Msg_N -- CODEFIX |
fbe627af RD |
977 | ("\?suggest using an initialized constant object instead", |
978 | Nam); | |
979 | end if; | |
fd366a46 | 980 | |
fbe627af RD |
981 | end case; |
982 | end if; | |
983 | ||
3f5a8fee AC |
984 | Check_Constrained_Object; |
985 | ||
16ca248a ES |
986 | -- An object renaming requires an exact match of the type. Class-wide |
987 | -- matching is not allowed. | |
996ae0b0 RK |
988 | |
989 | if Is_Class_Wide_Type (T) | |
990 | and then Base_Type (Etype (Nam)) /= Base_Type (T) | |
991 | then | |
992 | Wrong_Type (Nam, T); | |
993 | end if; | |
994 | ||
995 | T2 := Etype (Nam); | |
4de287c4 | 996 | |
92db5dee | 997 | -- Ada 2005 (AI-326): Handle wrong use of incomplete type |
4de287c4 ES |
998 | |
999 | if Nkind (Nam) = N_Explicit_Dereference | |
1000 | and then Ekind (Etype (T2)) = E_Incomplete_Type | |
1001 | then | |
3c829e3c ES |
1002 | Error_Msg_NE ("invalid use of incomplete type&", Id, T2); |
1003 | return; | |
426d2717 | 1004 | |
3c829e3c ES |
1005 | elsif Ekind (Etype (T)) = E_Incomplete_Type then |
1006 | Error_Msg_NE ("invalid use of incomplete type&", Id, T); | |
4de287c4 ES |
1007 | return; |
1008 | end if; | |
1009 | ||
923fa078 RD |
1010 | -- Ada 2005 (AI-327) |
1011 | ||
0791fbe9 | 1012 | if Ada_Version >= Ada_2005 |
923fa078 RD |
1013 | and then Nkind (Nam) = N_Attribute_Reference |
1014 | and then Attribute_Name (Nam) = Name_Priority | |
1015 | then | |
1016 | null; | |
1017 | ||
0791fbe9 | 1018 | elsif Ada_Version >= Ada_2005 |
923fa078 RD |
1019 | and then Nkind (Nam) in N_Has_Entity |
1020 | then | |
1021 | declare | |
426d2717 AC |
1022 | Nam_Decl : Node_Id; |
1023 | Nam_Ent : Entity_Id; | |
923fa078 RD |
1024 | |
1025 | begin | |
1026 | if Nkind (Nam) = N_Attribute_Reference then | |
1027 | Nam_Ent := Entity (Prefix (Nam)); | |
1028 | else | |
1029 | Nam_Ent := Entity (Nam); | |
1030 | end if; | |
1031 | ||
426d2717 | 1032 | Nam_Decl := Parent (Nam_Ent); |
923fa078 RD |
1033 | |
1034 | if Has_Null_Exclusion (N) | |
1035 | and then not Has_Null_Exclusion (Nam_Decl) | |
1036 | then | |
1037 | -- Ada 2005 (AI-423): If the object name denotes a generic | |
1038 | -- formal object of a generic unit G, and the object renaming | |
1039 | -- declaration occurs within the body of G or within the body | |
1040 | -- of a generic unit declared within the declarative region | |
fbe627af | 1041 | -- of G, then the declaration of the formal object of G must |
a3c39f83 | 1042 | -- have a null exclusion or a null-excluding subtype. |
923fa078 RD |
1043 | |
1044 | if Is_Formal_Object (Nam_Ent) | |
426d2717 | 1045 | and then In_Generic_Scope (Id) |
923fa078 | 1046 | then |
a3c39f83 ES |
1047 | if not Can_Never_Be_Null (Etype (Nam_Ent)) then |
1048 | Error_Msg_N | |
1049 | ("renamed formal does not exclude `NULL` " | |
1050 | & "(RM 8.5.1(4.6/2))", N); | |
1051 | ||
1052 | elsif In_Package_Body (Scope (Id)) then | |
1053 | Error_Msg_N | |
1054 | ("formal object does not have a null exclusion" | |
1055 | & "(RM 8.5.1(4.6/2))", N); | |
1056 | end if; | |
923fa078 | 1057 | |
16ca248a ES |
1058 | -- Ada 2005 (AI-423): Otherwise, the subtype of the object name |
1059 | -- shall exclude null. | |
923fa078 | 1060 | |
21d27997 | 1061 | elsif not Can_Never_Be_Null (Etype (Nam_Ent)) then |
fbe627af | 1062 | Error_Msg_N |
21d27997 RD |
1063 | ("renamed object does not exclude `NULL` " |
1064 | & "(RM 8.5.1(4.6/2))", N); | |
aecf0203 | 1065 | |
a3c39f83 ES |
1066 | -- An instance is illegal if it contains a renaming that |
1067 | -- excludes null, and the actual does not. The renaming | |
1068 | -- declaration has already indicated that the declaration | |
1069 | -- of the renamed actual in the instance will raise | |
1070 | -- constraint_error. | |
1071 | ||
426d2717 | 1072 | elsif Nkind (Nam_Decl) = N_Object_Declaration |
a3c39f83 ES |
1073 | and then In_Instance |
1074 | and then Present | |
426d2717 AC |
1075 | (Corresponding_Generic_Association (Nam_Decl)) |
1076 | and then Nkind (Expression (Nam_Decl)) | |
a3c39f83 ES |
1077 | = N_Raise_Constraint_Error |
1078 | then | |
1079 | Error_Msg_N | |
1080 | ("renamed actual does not exclude `NULL` " | |
1081 | & "(RM 8.5.1(4.6/2))", N); | |
1082 | ||
1083 | -- Finally, if there is a null exclusion, the subtype mark | |
1084 | -- must not be null-excluding. | |
1085 | ||
1086 | elsif No (Access_Definition (N)) | |
426d2717 | 1087 | and then Can_Never_Be_Null (T) |
a3c39f83 | 1088 | then |
aecf0203 | 1089 | Error_Msg_NE |
a3c39f83 ES |
1090 | ("`NOT NULL` not allowed (& already excludes null)", |
1091 | N, T); | |
fa961f76 | 1092 | |
923fa078 | 1093 | end if; |
fa961f76 | 1094 | |
a3c39f83 ES |
1095 | elsif Can_Never_Be_Null (T) |
1096 | and then not Can_Never_Be_Null (Etype (Nam_Ent)) | |
1097 | then | |
1098 | Error_Msg_N | |
1099 | ("renamed object does not exclude `NULL` " | |
1100 | & "(RM 8.5.1(4.6/2))", N); | |
1101 | ||
fa961f76 ES |
1102 | elsif Has_Null_Exclusion (N) |
1103 | and then No (Access_Definition (N)) | |
1104 | and then Can_Never_Be_Null (T) | |
1105 | then | |
1106 | Error_Msg_NE | |
1107 | ("`NOT NULL` not allowed (& already excludes null)", N, T); | |
923fa078 RD |
1108 | end if; |
1109 | end; | |
1110 | end if; | |
1111 | ||
996ae0b0 RK |
1112 | Set_Ekind (Id, E_Variable); |
1113 | Init_Size_Align (Id); | |
1114 | ||
1115 | if T = Any_Type or else Etype (Nam) = Any_Type then | |
1116 | return; | |
1117 | ||
923fa078 RD |
1118 | -- Verify that the renamed entity is an object or a function call. It |
1119 | -- may have been rewritten in several ways. | |
996ae0b0 RK |
1120 | |
1121 | elsif Is_Object_Reference (Nam) then | |
996ae0b0 RK |
1122 | if Comes_From_Source (N) |
1123 | and then Is_Dependent_Component_Of_Mutable_Object (Nam) | |
1124 | then | |
1125 | Error_Msg_N | |
1126 | ("illegal renaming of discriminant-dependent component", Nam); | |
996ae0b0 RK |
1127 | end if; |
1128 | ||
1129 | -- A static function call may have been folded into a literal | |
1130 | ||
1131 | elsif Nkind (Original_Node (Nam)) = N_Function_Call | |
1132 | ||
1133 | -- When expansion is disabled, attribute reference is not | |
1134 | -- rewritten as function call. Otherwise it may be rewritten | |
1135 | -- as a conversion, so check original node. | |
1136 | ||
1137 | or else (Nkind (Original_Node (Nam)) = N_Attribute_Reference | |
1138 | and then Is_Function_Attribute_Name | |
294ccb21 | 1139 | (Attribute_Name (Original_Node (Nam)))) |
996ae0b0 | 1140 | |
923fa078 RD |
1141 | -- Weird but legal, equivalent to renaming a function call. |
1142 | -- Illegal if the literal is the result of constant-folding an | |
1143 | -- attribute reference that is not a function. | |
996ae0b0 RK |
1144 | |
1145 | or else (Is_Entity_Name (Nam) | |
d4810530 ES |
1146 | and then Ekind (Entity (Nam)) = E_Enumeration_Literal |
1147 | and then | |
1148 | Nkind (Original_Node (Nam)) /= N_Attribute_Reference) | |
996ae0b0 RK |
1149 | |
1150 | or else (Nkind (Nam) = N_Type_Conversion | |
1151 | and then Is_Tagged_Type (Entity (Subtype_Mark (Nam)))) | |
1152 | then | |
1153 | null; | |
1154 | ||
923fa078 RD |
1155 | elsif Nkind (Nam) = N_Type_Conversion then |
1156 | Error_Msg_N | |
1157 | ("renaming of conversion only allowed for tagged types", Nam); | |
996ae0b0 | 1158 | |
923fa078 RD |
1159 | -- Ada 2005 (AI-327) |
1160 | ||
0791fbe9 | 1161 | elsif Ada_Version >= Ada_2005 |
923fa078 RD |
1162 | and then Nkind (Nam) = N_Attribute_Reference |
1163 | and then Attribute_Name (Nam) = Name_Priority | |
1164 | then | |
1165 | null; | |
1166 | ||
21d27997 RD |
1167 | -- Allow internally generated x'Reference expression |
1168 | ||
1169 | elsif Nkind (Nam) = N_Reference then | |
1170 | null; | |
1171 | ||
923fa078 RD |
1172 | else |
1173 | Error_Msg_N ("expect object name in renaming", Nam); | |
996ae0b0 RK |
1174 | end if; |
1175 | ||
1176 | Set_Etype (Id, T2); | |
1177 | ||
1178 | if not Is_Variable (Nam) then | |
1179 | Set_Ekind (Id, E_Constant); | |
fbf5a39b | 1180 | Set_Never_Set_In_Source (Id, True); |
996ae0b0 RK |
1181 | Set_Is_True_Constant (Id, True); |
1182 | end if; | |
1183 | ||
1184 | Set_Renamed_Object (Id, Nam); | |
1185 | end Analyze_Object_Renaming; | |
1186 | ||
1187 | ------------------------------ | |
1188 | -- Analyze_Package_Renaming -- | |
1189 | ------------------------------ | |
1190 | ||
1191 | procedure Analyze_Package_Renaming (N : Node_Id) is | |
1192 | New_P : constant Entity_Id := Defining_Entity (N); | |
1193 | Old_P : Entity_Id; | |
1194 | Spec : Node_Id; | |
1195 | ||
1196 | begin | |
ed4a1468 RD |
1197 | if Name (N) = Error then |
1198 | return; | |
1199 | end if; | |
1200 | ||
426d2717 | 1201 | -- Apply Text_IO kludge here since we may be renaming a child of Text_IO |
996ae0b0 RK |
1202 | |
1203 | Text_IO_Kludge (Name (N)); | |
1204 | ||
1205 | if Current_Scope /= Standard_Standard then | |
1206 | Set_Is_Pure (New_P, Is_Pure (Current_Scope)); | |
1207 | end if; | |
1208 | ||
1209 | Enter_Name (New_P); | |
1210 | Analyze (Name (N)); | |
16ca248a | 1211 | |
996ae0b0 RK |
1212 | if Is_Entity_Name (Name (N)) then |
1213 | Old_P := Entity (Name (N)); | |
1214 | else | |
1215 | Old_P := Any_Id; | |
1216 | end if; | |
1217 | ||
1218 | if Etype (Old_P) = Any_Type then | |
426d2717 | 1219 | Error_Msg_N ("expect package name in renaming", Name (N)); |
657a9dd9 | 1220 | |
996ae0b0 RK |
1221 | elsif Ekind (Old_P) /= E_Package |
1222 | and then not (Ekind (Old_P) = E_Generic_Package | |
1223 | and then In_Open_Scopes (Old_P)) | |
1224 | then | |
1225 | if Ekind (Old_P) = E_Generic_Package then | |
1226 | Error_Msg_N | |
1227 | ("generic package cannot be renamed as a package", Name (N)); | |
1228 | else | |
1229 | Error_Msg_Sloc := Sloc (Old_P); | |
1230 | Error_Msg_NE | |
1231 | ("expect package name in renaming, found& declared#", | |
1232 | Name (N), Old_P); | |
1233 | end if; | |
1234 | ||
bc41faa2 | 1235 | -- Set basic attributes to minimize cascaded errors |
996ae0b0 RK |
1236 | |
1237 | Set_Ekind (New_P, E_Package); | |
1238 | Set_Etype (New_P, Standard_Void_Type); | |
1239 | ||
294ccb21 RD |
1240 | -- Here for OK package renaming |
1241 | ||
996ae0b0 | 1242 | else |
923fa078 RD |
1243 | -- Entities in the old package are accessible through the renaming |
1244 | -- entity. The simplest implementation is to have both packages share | |
1245 | -- the entity list. | |
996ae0b0 RK |
1246 | |
1247 | Set_Ekind (New_P, E_Package); | |
1248 | Set_Etype (New_P, Standard_Void_Type); | |
1249 | ||
1250 | if Present (Renamed_Object (Old_P)) then | |
1251 | Set_Renamed_Object (New_P, Renamed_Object (Old_P)); | |
1252 | else | |
4de287c4 | 1253 | Set_Renamed_Object (New_P, Old_P); |
996ae0b0 RK |
1254 | end if; |
1255 | ||
1256 | Set_Has_Completion (New_P); | |
1257 | ||
1258 | Set_First_Entity (New_P, First_Entity (Old_P)); | |
1259 | Set_Last_Entity (New_P, Last_Entity (Old_P)); | |
1260 | Set_First_Private_Entity (New_P, First_Private_Entity (Old_P)); | |
1261 | Check_Library_Unit_Renaming (N, Old_P); | |
1262 | Generate_Reference (Old_P, Name (N)); | |
1263 | ||
294ccb21 | 1264 | -- If the renaming is in the visible part of a package, then we set |
7d823354 | 1265 | -- Renamed_In_Spec for the renamed package, to prevent giving |
294ccb21 RD |
1266 | -- warnings about no entities referenced. Such a warning would be |
1267 | -- overenthusiastic, since clients can see entities in the renamed | |
1268 | -- package via the visible package renaming. | |
1269 | ||
1270 | declare | |
1271 | Ent : constant Entity_Id := Cunit_Entity (Current_Sem_Unit); | |
1272 | begin | |
1273 | if Ekind (Ent) = E_Package | |
1274 | and then not In_Private_Part (Ent) | |
1275 | and then In_Extended_Main_Source_Unit (N) | |
1276 | and then Ekind (Old_P) = E_Package | |
1277 | then | |
1278 | Set_Renamed_In_Spec (Old_P); | |
1279 | end if; | |
1280 | end; | |
1281 | ||
996ae0b0 RK |
1282 | -- If this is the renaming declaration of a package instantiation |
1283 | -- within itself, it is the declaration that ends the list of actuals | |
1284 | -- for the instantiation. At this point, the subtypes that rename | |
1285 | -- the actuals are flagged as generic, to avoid spurious ambiguities | |
1286 | -- if the actuals for two distinct formals happen to coincide. If | |
1287 | -- the actual is a private type, the subtype has a private completion | |
1288 | -- that is flagged in the same fashion. | |
1289 | ||
1290 | -- Resolution is identical to what is was in the original generic. | |
1291 | -- On exit from the generic instance, these are turned into regular | |
1292 | -- subtypes again, so they are compatible with types in their class. | |
1293 | ||
1294 | if not Is_Generic_Instance (Old_P) then | |
1295 | return; | |
1296 | else | |
1297 | Spec := Specification (Unit_Declaration_Node (Old_P)); | |
1298 | end if; | |
1299 | ||
1300 | if Nkind (Spec) = N_Package_Specification | |
1301 | and then Present (Generic_Parent (Spec)) | |
1302 | and then Old_P = Current_Scope | |
1303 | and then Chars (New_P) = Chars (Generic_Parent (Spec)) | |
1304 | then | |
1305 | declare | |
16ca248a ES |
1306 | E : Entity_Id; |
1307 | ||
996ae0b0 | 1308 | begin |
16ca248a | 1309 | E := First_Entity (Old_P); |
996ae0b0 RK |
1310 | while Present (E) |
1311 | and then E /= New_P | |
1312 | loop | |
1313 | if Is_Type (E) | |
1314 | and then Nkind (Parent (E)) = N_Subtype_Declaration | |
1315 | then | |
1316 | Set_Is_Generic_Actual_Type (E); | |
1317 | ||
1318 | if Is_Private_Type (E) | |
1319 | and then Present (Full_View (E)) | |
1320 | then | |
1321 | Set_Is_Generic_Actual_Type (Full_View (E)); | |
1322 | end if; | |
1323 | end if; | |
1324 | ||
1325 | Next_Entity (E); | |
1326 | end loop; | |
1327 | end; | |
1328 | end if; | |
1329 | end if; | |
996ae0b0 RK |
1330 | end Analyze_Package_Renaming; |
1331 | ||
1332 | ------------------------------- | |
1333 | -- Analyze_Renamed_Character -- | |
1334 | ------------------------------- | |
1335 | ||
1336 | procedure Analyze_Renamed_Character | |
1337 | (N : Node_Id; | |
1338 | New_S : Entity_Id; | |
1339 | Is_Body : Boolean) | |
1340 | is | |
1341 | C : constant Node_Id := Name (N); | |
1342 | ||
1343 | begin | |
1344 | if Ekind (New_S) = E_Function then | |
1345 | Resolve (C, Etype (New_S)); | |
1346 | ||
1347 | if Is_Body then | |
1348 | Check_Frozen_Renaming (N, New_S); | |
1349 | end if; | |
1350 | ||
1351 | else | |
1352 | Error_Msg_N ("character literal can only be renamed as function", N); | |
1353 | end if; | |
1354 | end Analyze_Renamed_Character; | |
1355 | ||
1356 | --------------------------------- | |
1357 | -- Analyze_Renamed_Dereference -- | |
1358 | --------------------------------- | |
1359 | ||
1360 | procedure Analyze_Renamed_Dereference | |
1361 | (N : Node_Id; | |
1362 | New_S : Entity_Id; | |
1363 | Is_Body : Boolean) | |
1364 | is | |
1365 | Nam : constant Node_Id := Name (N); | |
1366 | P : constant Node_Id := Prefix (Nam); | |
1367 | Typ : Entity_Id; | |
fbf5a39b | 1368 | Ind : Interp_Index; |
996ae0b0 RK |
1369 | It : Interp; |
1370 | ||
1371 | begin | |
1372 | if not Is_Overloaded (P) then | |
996ae0b0 | 1373 | if Ekind (Etype (Nam)) /= E_Subprogram_Type |
bce79204 AC |
1374 | or else not Type_Conformant (Etype (Nam), New_S) |
1375 | then | |
996ae0b0 RK |
1376 | Error_Msg_N ("designated type does not match specification", P); |
1377 | else | |
fbf5a39b | 1378 | Resolve (P); |
996ae0b0 RK |
1379 | end if; |
1380 | ||
1381 | return; | |
1382 | ||
1383 | else | |
1384 | Typ := Any_Type; | |
fbf5a39b | 1385 | Get_First_Interp (Nam, Ind, It); |
996ae0b0 RK |
1386 | |
1387 | while Present (It.Nam) loop | |
1388 | ||
1389 | if Ekind (It.Nam) = E_Subprogram_Type | |
bce79204 AC |
1390 | and then Type_Conformant (It.Nam, New_S) |
1391 | then | |
996ae0b0 RK |
1392 | if Typ /= Any_Id then |
1393 | Error_Msg_N ("ambiguous renaming", P); | |
1394 | return; | |
1395 | else | |
1396 | Typ := It.Nam; | |
1397 | end if; | |
1398 | end if; | |
1399 | ||
fbf5a39b | 1400 | Get_Next_Interp (Ind, It); |
996ae0b0 RK |
1401 | end loop; |
1402 | ||
1403 | if Typ = Any_Type then | |
1404 | Error_Msg_N ("designated type does not match specification", P); | |
1405 | else | |
1406 | Resolve (N, Typ); | |
1407 | ||
1408 | if Is_Body then | |
1409 | Check_Frozen_Renaming (N, New_S); | |
1410 | end if; | |
1411 | end if; | |
1412 | end if; | |
1413 | end Analyze_Renamed_Dereference; | |
1414 | ||
1415 | --------------------------- | |
1416 | -- Analyze_Renamed_Entry -- | |
1417 | --------------------------- | |
1418 | ||
1419 | procedure Analyze_Renamed_Entry | |
1420 | (N : Node_Id; | |
1421 | New_S : Entity_Id; | |
1422 | Is_Body : Boolean) | |
1423 | is | |
fbf5a39b AC |
1424 | Nam : constant Node_Id := Name (N); |
1425 | Sel : constant Node_Id := Selector_Name (Nam); | |
996ae0b0 RK |
1426 | Old_S : Entity_Id; |
1427 | ||
1428 | begin | |
1429 | if Entity (Sel) = Any_Id then | |
1430 | ||
bc41faa2 | 1431 | -- Selector is undefined on prefix. Error emitted already |
996ae0b0 RK |
1432 | |
1433 | Set_Has_Completion (New_S); | |
1434 | return; | |
1435 | end if; | |
1436 | ||
16ca248a | 1437 | -- Otherwise find renamed entity and build body of New_S as a call to it |
996ae0b0 RK |
1438 | |
1439 | Old_S := Find_Renamed_Entity (N, Selector_Name (Nam), New_S); | |
1440 | ||
1441 | if Old_S = Any_Id then | |
1442 | Error_Msg_N (" no subprogram or entry matches specification", N); | |
1443 | else | |
1444 | if Is_Body then | |
1445 | Check_Subtype_Conformant (New_S, Old_S, N); | |
1446 | Generate_Reference (New_S, Defining_Entity (N), 'b'); | |
1447 | Style.Check_Identifier (Defining_Entity (N), New_S); | |
725393ea ES |
1448 | |
1449 | else | |
d4810530 | 1450 | -- Only mode conformance required for a renaming_as_declaration |
725393ea ES |
1451 | |
1452 | Check_Mode_Conformant (New_S, Old_S, N); | |
996ae0b0 RK |
1453 | end if; |
1454 | ||
1455 | Inherit_Renamed_Profile (New_S, Old_S); | |
294ccb21 | 1456 | |
426d2717 AC |
1457 | -- The prefix can be an arbitrary expression that yields a task type, |
1458 | -- so it must be resolved. | |
294ccb21 RD |
1459 | |
1460 | Resolve (Prefix (Nam), Scope (Old_S)); | |
996ae0b0 RK |
1461 | end if; |
1462 | ||
1463 | Set_Convention (New_S, Convention (Old_S)); | |
1464 | Set_Has_Completion (New_S, Inside_A_Generic); | |
1465 | ||
1466 | if Is_Body then | |
1467 | Check_Frozen_Renaming (N, New_S); | |
1468 | end if; | |
1469 | end Analyze_Renamed_Entry; | |
1470 | ||
1471 | ----------------------------------- | |
1472 | -- Analyze_Renamed_Family_Member -- | |
1473 | ----------------------------------- | |
1474 | ||
1475 | procedure Analyze_Renamed_Family_Member | |
1476 | (N : Node_Id; | |
1477 | New_S : Entity_Id; | |
1478 | Is_Body : Boolean) | |
1479 | is | |
fbf5a39b AC |
1480 | Nam : constant Node_Id := Name (N); |
1481 | P : constant Node_Id := Prefix (Nam); | |
996ae0b0 RK |
1482 | Old_S : Entity_Id; |
1483 | ||
1484 | begin | |
1485 | if (Is_Entity_Name (P) and then Ekind (Entity (P)) = E_Entry_Family) | |
1486 | or else (Nkind (P) = N_Selected_Component | |
1487 | and then | |
1488 | Ekind (Entity (Selector_Name (P))) = E_Entry_Family) | |
1489 | then | |
1490 | if Is_Entity_Name (P) then | |
1491 | Old_S := Entity (P); | |
1492 | else | |
1493 | Old_S := Entity (Selector_Name (P)); | |
1494 | end if; | |
1495 | ||
1496 | if not Entity_Matches_Spec (Old_S, New_S) then | |
1497 | Error_Msg_N ("entry family does not match specification", N); | |
1498 | ||
1499 | elsif Is_Body then | |
1500 | Check_Subtype_Conformant (New_S, Old_S, N); | |
1501 | Generate_Reference (New_S, Defining_Entity (N), 'b'); | |
1502 | Style.Check_Identifier (Defining_Entity (N), New_S); | |
1503 | end if; | |
16ca248a | 1504 | |
996ae0b0 RK |
1505 | else |
1506 | Error_Msg_N ("no entry family matches specification", N); | |
1507 | end if; | |
1508 | ||
1509 | Set_Has_Completion (New_S, Inside_A_Generic); | |
1510 | ||
1511 | if Is_Body then | |
1512 | Check_Frozen_Renaming (N, New_S); | |
1513 | end if; | |
1514 | end Analyze_Renamed_Family_Member; | |
1515 | ||
294ccb21 RD |
1516 | ----------------------------------------- |
1517 | -- Analyze_Renamed_Primitive_Operation -- | |
1518 | ----------------------------------------- | |
1519 | ||
1520 | procedure Analyze_Renamed_Primitive_Operation | |
1521 | (N : Node_Id; | |
1522 | New_S : Entity_Id; | |
1523 | Is_Body : Boolean) | |
1524 | is | |
1525 | Old_S : Entity_Id; | |
1526 | ||
1527 | function Conforms | |
1528 | (Subp : Entity_Id; | |
1529 | Ctyp : Conformance_Type) return Boolean; | |
1530 | -- Verify that the signatures of the renamed entity and the new entity | |
1531 | -- match. The first formal of the renamed entity is skipped because it | |
1532 | -- is the target object in any subsequent call. | |
1533 | ||
1534 | function Conforms | |
1535 | (Subp : Entity_Id; | |
1536 | Ctyp : Conformance_Type) return Boolean | |
1537 | is | |
1538 | Old_F : Entity_Id; | |
1539 | New_F : Entity_Id; | |
1540 | ||
1541 | begin | |
1542 | if Ekind (Subp) /= Ekind (New_S) then | |
1543 | return False; | |
1544 | end if; | |
1545 | ||
1546 | Old_F := Next_Formal (First_Formal (Subp)); | |
1547 | New_F := First_Formal (New_S); | |
1548 | while Present (Old_F) and then Present (New_F) loop | |
1549 | if not Conforming_Types (Etype (Old_F), Etype (New_F), Ctyp) then | |
1550 | return False; | |
1551 | end if; | |
1552 | ||
1553 | if Ctyp >= Mode_Conformant | |
1554 | and then Ekind (Old_F) /= Ekind (New_F) | |
1555 | then | |
1556 | return False; | |
1557 | end if; | |
1558 | ||
1559 | Next_Formal (New_F); | |
1560 | Next_Formal (Old_F); | |
1561 | end loop; | |
1562 | ||
1563 | return True; | |
1564 | end Conforms; | |
1565 | ||
1566 | begin | |
1567 | if not Is_Overloaded (Selector_Name (Name (N))) then | |
1568 | Old_S := Entity (Selector_Name (Name (N))); | |
1569 | ||
1570 | if not Conforms (Old_S, Type_Conformant) then | |
1571 | Old_S := Any_Id; | |
1572 | end if; | |
1573 | ||
1574 | else | |
1575 | -- Find the operation that matches the given signature | |
1576 | ||
1577 | declare | |
1578 | It : Interp; | |
1579 | Ind : Interp_Index; | |
1580 | ||
1581 | begin | |
1582 | Old_S := Any_Id; | |
1583 | Get_First_Interp (Selector_Name (Name (N)), Ind, It); | |
1584 | ||
1585 | while Present (It.Nam) loop | |
1586 | if Conforms (It.Nam, Type_Conformant) then | |
1587 | Old_S := It.Nam; | |
1588 | end if; | |
1589 | ||
1590 | Get_Next_Interp (Ind, It); | |
1591 | end loop; | |
1592 | end; | |
1593 | end if; | |
1594 | ||
1595 | if Old_S = Any_Id then | |
1596 | Error_Msg_N (" no subprogram or entry matches specification", N); | |
1597 | ||
1598 | else | |
1599 | if Is_Body then | |
1600 | if not Conforms (Old_S, Subtype_Conformant) then | |
1601 | Error_Msg_N ("subtype conformance error in renaming", N); | |
1602 | end if; | |
1603 | ||
1604 | Generate_Reference (New_S, Defining_Entity (N), 'b'); | |
1605 | Style.Check_Identifier (Defining_Entity (N), New_S); | |
1606 | ||
1607 | else | |
1608 | -- Only mode conformance required for a renaming_as_declaration | |
1609 | ||
1610 | if not Conforms (Old_S, Mode_Conformant) then | |
1611 | Error_Msg_N ("mode conformance error in renaming", N); | |
1612 | end if; | |
1613 | end if; | |
1614 | ||
1615 | -- Inherit_Renamed_Profile (New_S, Old_S); | |
1616 | ||
1617 | -- The prefix can be an arbitrary expression that yields an | |
1618 | -- object, so it must be resolved. | |
1619 | ||
1620 | Resolve (Prefix (Name (N))); | |
1621 | end if; | |
1622 | end Analyze_Renamed_Primitive_Operation; | |
1623 | ||
996ae0b0 RK |
1624 | --------------------------------- |
1625 | -- Analyze_Subprogram_Renaming -- | |
1626 | --------------------------------- | |
1627 | ||
1628 | procedure Analyze_Subprogram_Renaming (N : Node_Id) is | |
afc8324d AC |
1629 | Formal_Spec : constant Node_Id := Corresponding_Formal_Spec (N); |
1630 | Is_Actual : constant Boolean := Present (Formal_Spec); | |
2ba431e5 | 1631 | |
afc8324d | 1632 | CW_Actual : Boolean := False; |
2ba431e5 YM |
1633 | -- True if the renaming is for a defaulted formal subprogram when the |
1634 | -- actual for a related formal type is class-wide. For AI05-0071. | |
1635 | ||
923fa078 | 1636 | Inst_Node : Node_Id := Empty; |
0ab80019 | 1637 | Nam : constant Node_Id := Name (N); |
996ae0b0 | 1638 | New_S : Entity_Id; |
d239991f | 1639 | Old_S : Entity_Id := Empty; |
996ae0b0 | 1640 | Rename_Spec : Entity_Id; |
923fa078 RD |
1641 | Save_AV : constant Ada_Version_Type := Ada_Version; |
1642 | Save_AV_Exp : constant Ada_Version_Type := Ada_Version_Explicit; | |
1643 | Spec : constant Node_Id := Specification (N); | |
1644 | ||
1645 | procedure Check_Null_Exclusion | |
1646 | (Ren : Entity_Id; | |
1647 | Sub : Entity_Id); | |
1648 | -- Ada 2005 (AI-423): Given renaming Ren of subprogram Sub, check the | |
1649 | -- following AI rules: | |
16ca248a ES |
1650 | -- |
1651 | -- If Ren is a renaming of a formal subprogram and one of its | |
1652 | -- parameters has a null exclusion, then the corresponding formal | |
1653 | -- in Sub must also have one. Otherwise the subtype of the Sub's | |
1654 | -- formal parameter must exclude null. | |
1655 | -- | |
f3d57416 | 1656 | -- If Ren is a renaming of a formal function and its return |
16ca248a ES |
1657 | -- profile has a null exclusion, then Sub's return profile must |
1658 | -- have one. Otherwise the subtype of Sub's return profile must | |
1659 | -- exclude null. | |
996ae0b0 | 1660 | |
07fc65c4 | 1661 | function Original_Subprogram (Subp : Entity_Id) return Entity_Id; |
16ca248a ES |
1662 | -- Find renamed entity when the declaration is a renaming_as_body and |
1663 | -- the renamed entity may itself be a renaming_as_body. Used to enforce | |
1664 | -- rule that a renaming_as_body is illegal if the declaration occurs | |
1665 | -- before the subprogram it completes is frozen, and renaming indirectly | |
1666 | -- renames the subprogram itself.(Defect Report 8652/0027). | |
07fc65c4 | 1667 | |
1138cf59 AC |
1668 | function Check_Class_Wide_Actual return Entity_Id; |
1669 | -- AI05-0071: In an instance, if the actual for a formal type FT with | |
1670 | -- unknown discriminants is a class-wide type CT, and the generic has | |
1671 | -- a formal subprogram with a box for a primitive operation of FT, | |
1672 | -- then the corresponding actual subprogram denoted by the default is a | |
1673 | -- class-wide operation whose body is a dispatching call. We replace the | |
1674 | -- generated renaming declaration: | |
1675 | -- | |
c7b9d548 | 1676 | -- procedure P (X : CT) renames P; |
1138cf59 AC |
1677 | -- |
1678 | -- by a different renaming and a class-wide operation: | |
1679 | -- | |
c7b9d548 AC |
1680 | -- procedure Pr (X : T) renames P; -- renames primitive operation |
1681 | -- procedure P (X : CT); -- class-wide operation | |
1682 | -- ... | |
1683 | -- procedure P (X : CT) is begin Pr (X); end; -- dispatching call | |
1684 | -- | |
1138cf59 AC |
1685 | -- This rule only applies if there is no explicit visible class-wide |
1686 | -- operation at the point of the instantiation. | |
1687 | ||
1688 | ----------------------------- | |
1689 | -- Check_Class_Wide_Actual -- | |
1690 | ----------------------------- | |
1691 | ||
1692 | function Check_Class_Wide_Actual return Entity_Id is | |
1693 | Loc : constant Source_Ptr := Sloc (N); | |
1694 | ||
1695 | F : Entity_Id; | |
1696 | Formal_Type : Entity_Id; | |
1697 | Actual_Type : Entity_Id; | |
1698 | New_Body : Node_Id; | |
1699 | New_Decl : Node_Id; | |
1700 | Result : Entity_Id; | |
1701 | ||
1702 | function Make_Call (Prim_Op : Entity_Id) return Node_Id; | |
1703 | -- Build dispatching call for body of class-wide operation | |
1704 | ||
1705 | function Make_Spec return Node_Id; | |
1706 | -- Create subprogram specification for declaration and body of | |
1707 | -- class-wide operation, using signature of renaming declaration. | |
1708 | ||
1709 | --------------- | |
1710 | -- Make_Call -- | |
1711 | --------------- | |
1712 | ||
1713 | function Make_Call (Prim_Op : Entity_Id) return Node_Id is | |
1714 | Actuals : List_Id; | |
1715 | F : Node_Id; | |
1716 | ||
1717 | begin | |
1718 | Actuals := New_List; | |
1719 | F := First (Parameter_Specifications (Specification (New_Decl))); | |
1720 | while Present (F) loop | |
1721 | Append_To (Actuals, | |
1722 | Make_Identifier (Loc, Chars (Defining_Identifier (F)))); | |
1723 | Next (F); | |
1724 | end loop; | |
1725 | ||
1726 | if Ekind (Prim_Op) = E_Function then | |
1727 | return Make_Simple_Return_Statement (Loc, | |
1728 | Expression => | |
1729 | Make_Function_Call (Loc, | |
1730 | Name => New_Occurrence_Of (Prim_Op, Loc), | |
1731 | Parameter_Associations => Actuals)); | |
1732 | else | |
1733 | return | |
1734 | Make_Procedure_Call_Statement (Loc, | |
1735 | Name => New_Occurrence_Of (Prim_Op, Loc), | |
1736 | Parameter_Associations => Actuals); | |
1737 | end if; | |
1738 | end Make_Call; | |
1739 | ||
1740 | --------------- | |
1741 | -- Make_Spec -- | |
1742 | --------------- | |
1743 | ||
1744 | function Make_Spec return Node_Id is | |
1745 | Param_Specs : constant List_Id := Copy_Parameter_List (New_S); | |
1746 | ||
1747 | begin | |
1748 | if Ekind (New_S) = E_Procedure then | |
1749 | return | |
1750 | Make_Procedure_Specification (Loc, | |
1751 | Defining_Unit_Name => | |
1752 | Make_Defining_Identifier (Loc, | |
1753 | Chars (Defining_Unit_Name (Spec))), | |
1754 | Parameter_Specifications => Param_Specs); | |
1755 | else | |
1756 | return | |
1757 | Make_Function_Specification (Loc, | |
1758 | Defining_Unit_Name => | |
1759 | Make_Defining_Identifier (Loc, | |
1760 | Chars (Defining_Unit_Name (Spec))), | |
1761 | Parameter_Specifications => Param_Specs, | |
1762 | Result_Definition => | |
1763 | New_Copy_Tree (Result_Definition (Spec))); | |
1764 | end if; | |
1765 | end Make_Spec; | |
1766 | ||
1767 | -- Start of processing for Check_Class_Wide_Actual | |
1768 | ||
1769 | begin | |
1770 | Result := Any_Id; | |
1771 | Formal_Type := Empty; | |
1772 | Actual_Type := Empty; | |
1773 | ||
1774 | F := First_Formal (Formal_Spec); | |
1775 | while Present (F) loop | |
1776 | if Has_Unknown_Discriminants (Etype (F)) | |
1777 | and then Is_Class_Wide_Type (Get_Instance_Of (Etype (F))) | |
1778 | then | |
1779 | Formal_Type := Etype (F); | |
1780 | Actual_Type := Etype (Get_Instance_Of (Formal_Type)); | |
1781 | exit; | |
1782 | end if; | |
1783 | ||
1784 | Next_Formal (F); | |
1785 | end loop; | |
1786 | ||
1787 | if Present (Formal_Type) then | |
2ba431e5 | 1788 | CW_Actual := True; |
1138cf59 AC |
1789 | |
1790 | -- Create declaration and body for class-wide operation | |
1791 | ||
1792 | New_Decl := | |
1793 | Make_Subprogram_Declaration (Loc, Specification => Make_Spec); | |
1794 | ||
1795 | New_Body := | |
1796 | Make_Subprogram_Body (Loc, | |
1797 | Specification => Make_Spec, | |
1798 | Declarations => No_List, | |
1799 | Handled_Statement_Sequence => | |
1800 | Make_Handled_Sequence_Of_Statements (Loc, New_List)); | |
1801 | ||
1802 | -- Modify Spec and create internal name for renaming of primitive | |
1803 | -- operation. | |
1804 | ||
1805 | Set_Defining_Unit_Name (Spec, Make_Temporary (Loc, 'R')); | |
1806 | F := First (Parameter_Specifications (Spec)); | |
1807 | while Present (F) loop | |
1808 | if Nkind (Parameter_Type (F)) = N_Identifier | |
1809 | and then Is_Class_Wide_Type (Entity (Parameter_Type (F))) | |
1810 | then | |
1811 | Set_Parameter_Type (F, New_Occurrence_Of (Actual_Type, Loc)); | |
1812 | end if; | |
1813 | Next (F); | |
1814 | end loop; | |
1815 | ||
1816 | New_S := Analyze_Subprogram_Specification (Spec); | |
1817 | Result := Find_Renamed_Entity (N, Name (N), New_S, Is_Actual); | |
1818 | end if; | |
1819 | ||
1820 | if Result /= Any_Id then | |
1821 | Insert_Before (N, New_Decl); | |
1822 | Analyze (New_Decl); | |
1823 | ||
1824 | -- Add dispatching call to body of class-wide operation | |
1825 | ||
1826 | Append (Make_Call (Result), | |
1827 | Statements (Handled_Statement_Sequence (New_Body))); | |
1828 | ||
1829 | -- The generated body does not freeze. It is analyzed when the | |
1830 | -- generated operation is frozen. | |
1831 | ||
1832 | Append_Freeze_Action (Defining_Entity (New_Decl), New_Body); | |
1833 | ||
1834 | Result := Defining_Entity (New_Decl); | |
1835 | end if; | |
1836 | ||
3e24afaa | 1837 | -- Return the class-wide operation if one was created |
1138cf59 AC |
1838 | |
1839 | return Result; | |
1840 | end Check_Class_Wide_Actual; | |
1841 | ||
923fa078 RD |
1842 | -------------------------- |
1843 | -- Check_Null_Exclusion -- | |
1844 | -------------------------- | |
1845 | ||
1846 | procedure Check_Null_Exclusion | |
1847 | (Ren : Entity_Id; | |
1848 | Sub : Entity_Id) | |
1849 | is | |
16ca248a ES |
1850 | Ren_Formal : Entity_Id; |
1851 | Sub_Formal : Entity_Id; | |
923fa078 RD |
1852 | |
1853 | begin | |
1854 | -- Parameter check | |
1855 | ||
16ca248a ES |
1856 | Ren_Formal := First_Formal (Ren); |
1857 | Sub_Formal := First_Formal (Sub); | |
923fa078 RD |
1858 | while Present (Ren_Formal) |
1859 | and then Present (Sub_Formal) | |
1860 | loop | |
1861 | if Has_Null_Exclusion (Parent (Ren_Formal)) | |
1862 | and then | |
1863 | not (Has_Null_Exclusion (Parent (Sub_Formal)) | |
1864 | or else Can_Never_Be_Null (Etype (Sub_Formal))) | |
1865 | then | |
fbe627af RD |
1866 | Error_Msg_NE |
1867 | ("`NOT NULL` required for parameter &", | |
1868 | Parent (Sub_Formal), Sub_Formal); | |
923fa078 RD |
1869 | end if; |
1870 | ||
1871 | Next_Formal (Ren_Formal); | |
1872 | Next_Formal (Sub_Formal); | |
1873 | end loop; | |
1874 | ||
1875 | -- Return profile check | |
1876 | ||
1877 | if Nkind (Parent (Ren)) = N_Function_Specification | |
1878 | and then Nkind (Parent (Sub)) = N_Function_Specification | |
1879 | and then Has_Null_Exclusion (Parent (Ren)) | |
1880 | and then | |
1881 | not (Has_Null_Exclusion (Parent (Sub)) | |
1882 | or else Can_Never_Be_Null (Etype (Sub))) | |
1883 | then | |
fbe627af RD |
1884 | Error_Msg_N |
1885 | ("return must specify `NOT NULL`", | |
1886 | Result_Definition (Parent (Sub))); | |
923fa078 RD |
1887 | end if; |
1888 | end Check_Null_Exclusion; | |
1889 | ||
07fc65c4 GB |
1890 | ------------------------- |
1891 | -- Original_Subprogram -- | |
1892 | ------------------------- | |
1893 | ||
1894 | function Original_Subprogram (Subp : Entity_Id) return Entity_Id is | |
1895 | Orig_Decl : Node_Id; | |
1896 | Orig_Subp : Entity_Id; | |
1897 | ||
1898 | begin | |
1899 | -- First case: renamed entity is itself a renaming | |
1900 | ||
1901 | if Present (Alias (Subp)) then | |
1902 | return Alias (Subp); | |
1903 | ||
1904 | elsif | |
1905 | Nkind (Unit_Declaration_Node (Subp)) = N_Subprogram_Declaration | |
1906 | and then Present | |
1907 | (Corresponding_Body (Unit_Declaration_Node (Subp))) | |
1908 | then | |
1909 | -- Check if renamed entity is a renaming_as_body | |
1910 | ||
1911 | Orig_Decl := | |
1912 | Unit_Declaration_Node | |
1913 | (Corresponding_Body (Unit_Declaration_Node (Subp))); | |
1914 | ||
1915 | if Nkind (Orig_Decl) = N_Subprogram_Renaming_Declaration then | |
1916 | Orig_Subp := Entity (Name (Orig_Decl)); | |
1917 | ||
1918 | if Orig_Subp = Rename_Spec then | |
1919 | ||
bc41faa2 | 1920 | -- Circularity detected |
07fc65c4 GB |
1921 | |
1922 | return Orig_Subp; | |
1923 | ||
1924 | else | |
1925 | return (Original_Subprogram (Orig_Subp)); | |
1926 | end if; | |
1927 | else | |
1928 | return Subp; | |
1929 | end if; | |
1930 | else | |
1931 | return Subp; | |
1932 | end if; | |
1933 | end Original_Subprogram; | |
1934 | ||
fbf5a39b | 1935 | -- Start of processing for Analyze_Subprogram_Renaming |
07fc65c4 | 1936 | |
996ae0b0 RK |
1937 | begin |
1938 | -- We must test for the attribute renaming case before the Analyze | |
1939 | -- call because otherwise Sem_Attr will complain that the attribute | |
1940 | -- is missing an argument when it is analyzed. | |
1941 | ||
1942 | if Nkind (Nam) = N_Attribute_Reference then | |
d239991f | 1943 | |
16ca248a ES |
1944 | -- In the case of an abstract formal subprogram association, rewrite |
1945 | -- an actual given by a stream attribute as the name of the | |
1946 | -- corresponding stream primitive of the type. | |
d239991f | 1947 | |
16ca248a ES |
1948 | -- In a generic context the stream operations are not generated, and |
1949 | -- this must be treated as a normal attribute reference, to be | |
1950 | -- expanded in subsequent instantiations. | |
d4810530 | 1951 | |
16ca248a | 1952 | if Is_Actual and then Is_Abstract_Subprogram (Formal_Spec) |
d4810530 ES |
1953 | and then Expander_Active |
1954 | then | |
d239991f GD |
1955 | declare |
1956 | Stream_Prim : Entity_Id; | |
1957 | Prefix_Type : constant Entity_Id := Entity (Prefix (Nam)); | |
1958 | ||
1959 | begin | |
1960 | -- The class-wide forms of the stream attributes are not | |
1961 | -- primitive dispatching operations (even though they | |
1962 | -- internally dispatch to a stream attribute). | |
1963 | ||
1964 | if Is_Class_Wide_Type (Prefix_Type) then | |
1965 | Error_Msg_N | |
1966 | ("attribute must be a primitive dispatching operation", | |
1967 | Nam); | |
1968 | return; | |
1969 | end if; | |
1970 | ||
1971 | -- Retrieve the primitive subprogram associated with the | |
16ca248a ES |
1972 | -- attribute. This can only be a stream attribute, since those |
1973 | -- are the only ones that are dispatching (and the actual for | |
1974 | -- an abstract formal subprogram must be dispatching | |
1975 | -- operation). | |
d239991f | 1976 | |
6a4d72a6 ES |
1977 | begin |
1978 | case Attribute_Name (Nam) is | |
1979 | when Name_Input => | |
1980 | Stream_Prim := | |
1981 | Find_Prim_Op (Prefix_Type, TSS_Stream_Input); | |
1982 | when Name_Output => | |
1983 | Stream_Prim := | |
1984 | Find_Prim_Op (Prefix_Type, TSS_Stream_Output); | |
1985 | when Name_Read => | |
1986 | Stream_Prim := | |
1987 | Find_Prim_Op (Prefix_Type, TSS_Stream_Read); | |
1988 | when Name_Write => | |
1989 | Stream_Prim := | |
1990 | Find_Prim_Op (Prefix_Type, TSS_Stream_Write); | |
1991 | when others => | |
1992 | Error_Msg_N | |
1993 | ("attribute must be a primitive" | |
1994 | & " dispatching operation", Nam); | |
1995 | return; | |
1996 | end case; | |
a7a0d4dd | 1997 | |
6a4d72a6 ES |
1998 | exception |
1999 | ||
2000 | -- If no operation was found, and the type is limited, | |
2001 | -- the user should have defined one. | |
2002 | ||
2003 | when Program_Error => | |
2004 | if Is_Limited_Type (Prefix_Type) then | |
2005 | Error_Msg_NE | |
2006 | ("stream operation not defined for type&", | |
2007 | N, Prefix_Type); | |
2008 | return; | |
2009 | ||
a7a0d4dd | 2010 | -- Otherwise, compiler should have generated default |
6a4d72a6 ES |
2011 | |
2012 | else | |
2013 | raise; | |
2014 | end if; | |
2015 | end; | |
d239991f GD |
2016 | |
2017 | -- Rewrite the attribute into the name of its corresponding | |
2018 | -- primitive dispatching subprogram. We can then proceed with | |
2019 | -- the usual processing for subprogram renamings. | |
2020 | ||
2021 | declare | |
2022 | Prim_Name : constant Node_Id := | |
2023 | Make_Identifier (Sloc (Nam), | |
2024 | Chars => Chars (Stream_Prim)); | |
2025 | begin | |
2026 | Set_Entity (Prim_Name, Stream_Prim); | |
2027 | Rewrite (Nam, Prim_Name); | |
2028 | Analyze (Nam); | |
2029 | end; | |
2030 | end; | |
2031 | ||
2032 | -- Normal processing for a renaming of an attribute | |
2033 | ||
2034 | else | |
2035 | Attribute_Renaming (N); | |
2036 | return; | |
2037 | end if; | |
996ae0b0 RK |
2038 | end if; |
2039 | ||
2040 | -- Check whether this declaration corresponds to the instantiation | |
82c80734 | 2041 | -- of a formal subprogram. |
996ae0b0 | 2042 | |
16ca248a ES |
2043 | -- If this is an instantiation, the corresponding actual is frozen and |
2044 | -- error messages can be made more precise. If this is a default | |
2045 | -- subprogram, the entity is already established in the generic, and is | |
2046 | -- not retrieved by visibility. If it is a default with a box, the | |
996ae0b0 | 2047 | -- candidate interpretations, if any, have been collected when building |
16ca248a ES |
2048 | -- the renaming declaration. If overloaded, the proper interpretation is |
2049 | -- determined in Find_Renamed_Entity. If the entity is an operator, | |
996ae0b0 RK |
2050 | -- Find_Renamed_Entity applies additional visibility checks. |
2051 | ||
d239991f GD |
2052 | if Is_Actual then |
2053 | Inst_Node := Unit_Declaration_Node (Formal_Spec); | |
996ae0b0 RK |
2054 | |
2055 | if Is_Entity_Name (Nam) | |
2056 | and then Present (Entity (Nam)) | |
2057 | and then not Comes_From_Source (Nam) | |
2058 | and then not Is_Overloaded (Nam) | |
2059 | then | |
2060 | Old_S := Entity (Nam); | |
fbf5a39b | 2061 | New_S := Analyze_Subprogram_Specification (Spec); |
996ae0b0 | 2062 | |
2e071734 AC |
2063 | -- Operator case |
2064 | ||
2065 | if Ekind (Entity (Nam)) = E_Operator then | |
2066 | ||
2067 | -- Box present | |
2068 | ||
2069 | if Box_Present (Inst_Node) then | |
2070 | Old_S := Find_Renamed_Entity (N, Name (N), New_S, Is_Actual); | |
2071 | ||
2072 | -- If there is an immediately visible homonym of the operator | |
2073 | -- and the declaration has a default, this is worth a warning | |
2074 | -- because the user probably did not intend to get the pre- | |
16ca248a ES |
2075 | -- defined operator, visible in the generic declaration. To |
2076 | -- find if there is an intended candidate, analyze the renaming | |
2077 | -- again in the current context. | |
2e071734 AC |
2078 | |
2079 | elsif Scope (Old_S) = Standard_Standard | |
2080 | and then Present (Default_Name (Inst_Node)) | |
2081 | then | |
2082 | declare | |
2083 | Decl : constant Node_Id := New_Copy_Tree (N); | |
2084 | Hidden : Entity_Id; | |
2085 | ||
2086 | begin | |
2087 | Set_Entity (Name (Decl), Empty); | |
2088 | Analyze (Name (Decl)); | |
2089 | Hidden := | |
2090 | Find_Renamed_Entity (Decl, Name (Decl), New_S, True); | |
2091 | ||
2092 | if Present (Hidden) | |
2093 | and then In_Open_Scopes (Scope (Hidden)) | |
2094 | and then Is_Immediately_Visible (Hidden) | |
2095 | and then Comes_From_Source (Hidden) | |
923fa078 | 2096 | and then Hidden /= Old_S |
2e071734 AC |
2097 | then |
2098 | Error_Msg_Sloc := Sloc (Hidden); | |
2099 | Error_Msg_N ("?default subprogram is resolved " & | |
2100 | "in the generic declaration " & | |
11560bcc | 2101 | "(RM 12.6(17))", N); |
2e071734 AC |
2102 | Error_Msg_NE ("\?and will not use & #", N, Hidden); |
2103 | end if; | |
2104 | end; | |
2105 | end if; | |
996ae0b0 RK |
2106 | end if; |
2107 | ||
2108 | else | |
2109 | Analyze (Nam); | |
fbf5a39b | 2110 | New_S := Analyze_Subprogram_Specification (Spec); |
996ae0b0 RK |
2111 | end if; |
2112 | ||
996ae0b0 RK |
2113 | else |
2114 | -- Renamed entity must be analyzed first, to avoid being hidden by | |
2115 | -- new name (which might be the same in a generic instance). | |
2116 | ||
2117 | Analyze (Nam); | |
2118 | ||
2119 | -- The renaming defines a new overloaded entity, which is analyzed | |
2120 | -- like a subprogram declaration. | |
2121 | ||
fbf5a39b | 2122 | New_S := Analyze_Subprogram_Specification (Spec); |
996ae0b0 RK |
2123 | end if; |
2124 | ||
2125 | if Current_Scope /= Standard_Standard then | |
2126 | Set_Is_Pure (New_S, Is_Pure (Current_Scope)); | |
2127 | end if; | |
2128 | ||
2129 | Rename_Spec := Find_Corresponding_Spec (N); | |
2130 | ||
294ccb21 RD |
2131 | -- Case of Renaming_As_Body |
2132 | ||
996ae0b0 RK |
2133 | if Present (Rename_Spec) then |
2134 | ||
294ccb21 RD |
2135 | -- Renaming declaration is the completion of the declaration of |
2136 | -- Rename_Spec. We build an actual body for it at the freezing point. | |
996ae0b0 RK |
2137 | |
2138 | Set_Corresponding_Spec (N, Rename_Spec); | |
fbe627af | 2139 | |
ff81221b ES |
2140 | -- Deal with special case of stream functions of abstract types |
2141 | -- and interfaces. | |
294ccb21 | 2142 | |
d4810530 ES |
2143 | if Nkind (Unit_Declaration_Node (Rename_Spec)) = |
2144 | N_Abstract_Subprogram_Declaration | |
2145 | then | |
ff81221b ES |
2146 | -- Input stream functions are abstract if the object type is |
2147 | -- abstract. Similarly, all default stream functions for an | |
30783513 | 2148 | -- interface type are abstract. However, these subprograms may |
ff81221b ES |
2149 | -- receive explicit declarations in representation clauses, making |
2150 | -- the attribute subprograms usable as defaults in subsequent | |
2151 | -- type extensions. | |
d4810530 ES |
2152 | -- In this case we rewrite the declaration to make the subprogram |
2153 | -- non-abstract. We remove the previous declaration, and insert | |
2154 | -- the new one at the point of the renaming, to prevent premature | |
2155 | -- access to unfrozen types. The new declaration reuses the | |
2156 | -- specification of the previous one, and must not be analyzed. | |
2157 | ||
ff81221b ES |
2158 | pragma Assert |
2159 | (Is_Primitive (Entity (Nam)) | |
2160 | and then | |
2161 | Is_Abstract_Type (Find_Dispatching_Type (Entity (Nam)))); | |
d4810530 ES |
2162 | declare |
2163 | Old_Decl : constant Node_Id := | |
2164 | Unit_Declaration_Node (Rename_Spec); | |
2165 | New_Decl : constant Node_Id := | |
2166 | Make_Subprogram_Declaration (Sloc (N), | |
2167 | Specification => | |
2168 | Relocate_Node (Specification (Old_Decl))); | |
2169 | begin | |
2170 | Remove (Old_Decl); | |
2171 | Insert_After (N, New_Decl); | |
16ca248a | 2172 | Set_Is_Abstract_Subprogram (Rename_Spec, False); |
d4810530 ES |
2173 | Set_Analyzed (New_Decl); |
2174 | end; | |
2175 | end if; | |
2176 | ||
996ae0b0 RK |
2177 | Set_Corresponding_Body (Unit_Declaration_Node (Rename_Spec), New_S); |
2178 | ||
0ab80019 | 2179 | if Ada_Version = Ada_83 and then Comes_From_Source (N) then |
996ae0b0 RK |
2180 | Error_Msg_N ("(Ada 83) renaming cannot serve as a body", N); |
2181 | end if; | |
2182 | ||
923fa078 | 2183 | Set_Convention (New_S, Convention (Rename_Spec)); |
996ae0b0 RK |
2184 | Check_Fully_Conformant (New_S, Rename_Spec); |
2185 | Set_Public_Status (New_S); | |
2186 | ||
294ccb21 RD |
2187 | -- The specification does not introduce new formals, but only |
2188 | -- repeats the formals of the original subprogram declaration. | |
2189 | -- For cross-reference purposes, and for refactoring tools, we | |
2190 | -- treat the formals of the renaming declaration as body formals. | |
2191 | ||
2192 | Reference_Body_Formals (Rename_Spec, New_S); | |
2193 | ||
4de287c4 ES |
2194 | -- Indicate that the entity in the declaration functions like the |
2195 | -- corresponding body, and is not a new entity. The body will be | |
2196 | -- constructed later at the freeze point, so indicate that the | |
2197 | -- completion has not been seen yet. | |
996ae0b0 RK |
2198 | |
2199 | Set_Ekind (New_S, E_Subprogram_Body); | |
2200 | New_S := Rename_Spec; | |
5eb10f25 | 2201 | Set_Has_Completion (Rename_Spec, False); |
996ae0b0 | 2202 | |
4de287c4 | 2203 | -- Ada 2005: check overriding indicator |
edd63e9b | 2204 | |
038140ed | 2205 | if Present (Overridden_Operation (Rename_Spec)) then |
235f4375 AC |
2206 | if Must_Not_Override (Specification (N)) then |
2207 | Error_Msg_NE | |
2208 | ("subprogram& overrides inherited operation", | |
2209 | N, Rename_Spec); | |
2210 | elsif | |
2211 | Style_Check and then not Must_Override (Specification (N)) | |
2212 | then | |
2213 | Style.Missing_Overriding (N, Rename_Spec); | |
2214 | end if; | |
edd63e9b | 2215 | |
235f4375 AC |
2216 | elsif Must_Override (Specification (N)) then |
2217 | Error_Msg_NE ("subprogram& is not overriding", N, Rename_Spec); | |
edd63e9b ES |
2218 | end if; |
2219 | ||
294ccb21 RD |
2220 | -- Normal subprogram renaming (not renaming as body) |
2221 | ||
996ae0b0 RK |
2222 | else |
2223 | Generate_Definition (New_S); | |
2224 | New_Overloaded_Entity (New_S); | |
edd63e9b | 2225 | |
996ae0b0 RK |
2226 | if Is_Entity_Name (Nam) |
2227 | and then Is_Intrinsic_Subprogram (Entity (Nam)) | |
2228 | then | |
2229 | null; | |
2230 | else | |
2231 | Check_Delayed_Subprogram (New_S); | |
2232 | end if; | |
2233 | end if; | |
2234 | ||
4de287c4 ES |
2235 | -- There is no need for elaboration checks on the new entity, which may |
2236 | -- be called before the next freezing point where the body will appear. | |
2237 | -- Elaboration checks refer to the real entity, not the one created by | |
2238 | -- the renaming declaration. | |
996ae0b0 | 2239 | |
fbf5a39b | 2240 | Set_Kill_Elaboration_Checks (New_S, True); |
996ae0b0 RK |
2241 | |
2242 | if Etype (Nam) = Any_Type then | |
2243 | Set_Has_Completion (New_S); | |
2244 | return; | |
2245 | ||
2246 | elsif Nkind (Nam) = N_Selected_Component then | |
2247 | ||
294ccb21 RD |
2248 | -- A prefix of the form A.B can designate an entry of task A, a |
2249 | -- protected operation of protected object A, or finally a primitive | |
2250 | -- operation of object A. In the later case, A is an object of some | |
2251 | -- tagged type, or an access type that denotes one such. To further | |
2252 | -- distinguish these cases, note that the scope of a task entry or | |
2253 | -- protected operation is type of the prefix. | |
996ae0b0 | 2254 | |
294ccb21 RD |
2255 | -- The prefix could be an overloaded function call that returns both |
2256 | -- kinds of operations. This overloading pathology is left to the | |
2257 | -- dedicated reader ??? | |
2258 | ||
2259 | declare | |
2260 | T : constant Entity_Id := Etype (Prefix (Nam)); | |
2261 | ||
2262 | begin | |
2263 | if Present (T) | |
2264 | and then | |
2265 | (Is_Tagged_Type (T) | |
2266 | or else | |
2267 | (Is_Access_Type (T) | |
2268 | and then | |
2269 | Is_Tagged_Type (Designated_Type (T)))) | |
2270 | and then Scope (Entity (Selector_Name (Nam))) /= T | |
2271 | then | |
2272 | Analyze_Renamed_Primitive_Operation | |
2273 | (N, New_S, Present (Rename_Spec)); | |
2274 | return; | |
2275 | ||
2276 | else | |
2277 | -- Renamed entity is an entry or protected operation. For those | |
2278 | -- cases an explicit body is built (at the point of freezing of | |
2279 | -- this entity) that contains a call to the renamed entity. | |
2280 | ||
2281 | -- This is not allowed for renaming as body if the renamed | |
2282 | -- spec is already frozen (see RM 8.5.4(5) for details). | |
2283 | ||
2284 | if Present (Rename_Spec) | |
2285 | and then Is_Frozen (Rename_Spec) | |
2286 | then | |
2287 | Error_Msg_N | |
2288 | ("renaming-as-body cannot rename entry as subprogram", N); | |
2289 | Error_Msg_NE | |
2290 | ("\since & is already frozen (RM 8.5.4(5))", | |
2291 | N, Rename_Spec); | |
2292 | else | |
2293 | Analyze_Renamed_Entry (N, New_S, Present (Rename_Spec)); | |
2294 | end if; | |
2295 | ||
2296 | return; | |
2297 | end if; | |
2298 | end; | |
996ae0b0 RK |
2299 | |
2300 | elsif Nkind (Nam) = N_Explicit_Dereference then | |
2301 | ||
2302 | -- Renamed entity is designated by access_to_subprogram expression. | |
2303 | -- Must build body to encapsulate call, as in the entry case. | |
2304 | ||
2305 | Analyze_Renamed_Dereference (N, New_S, Present (Rename_Spec)); | |
2306 | return; | |
2307 | ||
2308 | elsif Nkind (Nam) = N_Indexed_Component then | |
2309 | Analyze_Renamed_Family_Member (N, New_S, Present (Rename_Spec)); | |
2310 | return; | |
2311 | ||
2312 | elsif Nkind (Nam) = N_Character_Literal then | |
2313 | Analyze_Renamed_Character (N, New_S, Present (Rename_Spec)); | |
2314 | return; | |
2315 | ||
a3f2babd | 2316 | elsif not Is_Entity_Name (Nam) |
996ae0b0 RK |
2317 | or else not Is_Overloadable (Entity (Nam)) |
2318 | then | |
2319 | Error_Msg_N ("expect valid subprogram name in renaming", N); | |
2320 | return; | |
996ae0b0 RK |
2321 | end if; |
2322 | ||
11560bcc TQ |
2323 | -- Find the renamed entity that matches the given specification. Disable |
2324 | -- Ada_83 because there is no requirement of full conformance between | |
2325 | -- renamed entity and new entity, even though the same circuit is used. | |
2326 | ||
2327 | -- This is a bit of a kludge, which introduces a really irregular use of | |
2328 | -- Ada_Version[_Explicit]. Would be nice to find cleaner way to do this | |
2329 | -- ??? | |
2330 | ||
2331 | Ada_Version := Ada_Version_Type'Max (Ada_Version, Ada_95); | |
2332 | Ada_Version_Explicit := Ada_Version; | |
2333 | ||
2334 | if No (Old_S) then | |
2335 | Old_S := Find_Renamed_Entity (N, Name (N), New_S, Is_Actual); | |
2336 | ||
1366997b AC |
2337 | -- The visible operation may be an inherited abstract operation that |
2338 | -- was overridden in the private part, in which case a call will | |
2339 | -- dispatch to the overriding operation. Use the overriding one in | |
2340 | -- the renaming declaration, to prevent spurious errors below. | |
2341 | ||
2342 | if Is_Overloadable (Old_S) | |
2343 | and then Is_Abstract_Subprogram (Old_S) | |
2344 | and then No (DTC_Entity (Old_S)) | |
2345 | and then Present (Alias (Old_S)) | |
2346 | and then not Is_Abstract_Subprogram (Alias (Old_S)) | |
038140ed | 2347 | and then Present (Overridden_Operation (Alias (Old_S))) |
1366997b AC |
2348 | then |
2349 | Old_S := Alias (Old_S); | |
2350 | end if; | |
2351 | ||
11560bcc TQ |
2352 | -- When the renamed subprogram is overloaded and used as an actual |
2353 | -- of a generic, its entity is set to the first available homonym. | |
2354 | -- We must first disambiguate the name, then set the proper entity. | |
2355 | ||
1378bf10 | 2356 | if Is_Actual and then Is_Overloaded (Nam) then |
11560bcc TQ |
2357 | Set_Entity (Nam, Old_S); |
2358 | end if; | |
2359 | end if; | |
2360 | ||
4de287c4 ES |
2361 | -- Most common case: subprogram renames subprogram. No body is generated |
2362 | -- in this case, so we must indicate the declaration is complete as is. | |
b2c4d56d | 2363 | -- and inherit various attributes of the renamed subprogram. |
996ae0b0 RK |
2364 | |
2365 | if No (Rename_Spec) then | |
923fa078 | 2366 | Set_Has_Completion (New_S); |
b2c4d56d | 2367 | Set_Is_Imported (New_S, Is_Imported (Entity (Nam))); |
923fa078 RD |
2368 | Set_Is_Pure (New_S, Is_Pure (Entity (Nam))); |
2369 | Set_Is_Preelaborated (New_S, Is_Preelaborated (Entity (Nam))); | |
2370 | ||
2371 | -- Ada 2005 (AI-423): Check the consistency of null exclusions | |
11560bcc | 2372 | -- between a subprogram and its correct renaming. |
923fa078 | 2373 | |
11560bcc TQ |
2374 | -- Note: the Any_Id check is a guard that prevents compiler crashes |
2375 | -- when performing a null exclusion check between a renaming and a | |
2376 | -- renamed subprogram that has been found to be illegal. | |
2377 | ||
0791fbe9 | 2378 | if Ada_Version >= Ada_2005 |
11560bcc TQ |
2379 | and then Entity (Nam) /= Any_Id |
2380 | then | |
923fa078 RD |
2381 | Check_Null_Exclusion |
2382 | (Ren => New_S, | |
2383 | Sub => Entity (Nam)); | |
2384 | end if; | |
90067a15 ES |
2385 | |
2386 | -- Enforce the Ada 2005 rule that the renamed entity cannot require | |
2387 | -- overriding. The flag Requires_Overriding is set very selectively | |
2388 | -- and misses some other illegal cases. The additional conditions | |
2389 | -- checked below are sufficient but not necessary ??? | |
2390 | ||
2391 | -- The rule does not apply to the renaming generated for an actual | |
2392 | -- subprogram in an instance. | |
2393 | ||
2394 | if Is_Actual then | |
2395 | null; | |
2396 | ||
f3d57416 | 2397 | -- Guard against previous errors, and omit renamings of predefined |
90067a15 ES |
2398 | -- operators. |
2399 | ||
bce79204 | 2400 | elsif not Ekind_In (Old_S, E_Function, E_Procedure) then |
90067a15 ES |
2401 | null; |
2402 | ||
2403 | elsif Requires_Overriding (Old_S) | |
2404 | or else | |
2405 | (Is_Abstract_Subprogram (Old_S) | |
2406 | and then Present (Find_Dispatching_Type (Old_S)) | |
2407 | and then | |
2408 | not Is_Abstract_Type (Find_Dispatching_Type (Old_S))) | |
2409 | then | |
2410 | Error_Msg_N | |
2411 | ("renamed entity cannot be " | |
2412 | & "subprogram that requires overriding (RM 8.5.4 (5.1))", N); | |
2413 | end if; | |
996ae0b0 RK |
2414 | end if; |
2415 | ||
1138cf59 AC |
2416 | -- If no renamed entity was found, check whether the renaming is for |
2417 | -- a defaulted actual subprogram with a class-wide actual. | |
2418 | ||
2419 | if Old_S = Any_Id | |
2420 | and then Is_Actual | |
2421 | and then From_Default (N) | |
2422 | then | |
2423 | Old_S := Check_Class_Wide_Actual; | |
2424 | end if; | |
2425 | ||
996ae0b0 | 2426 | if Old_S /= Any_Id then |
1378bf10 | 2427 | if Is_Actual and then From_Default (N) then |
ff4f0ed0 | 2428 | |
996ae0b0 RK |
2429 | -- This is an implicit reference to the default actual |
2430 | ||
2431 | Generate_Reference (Old_S, Nam, Typ => 'i', Force => True); | |
ff4f0ed0 | 2432 | |
996ae0b0 RK |
2433 | else |
2434 | Generate_Reference (Old_S, Nam); | |
2435 | end if; | |
2436 | ||
edd63e9b ES |
2437 | -- For a renaming-as-body, require subtype conformance, but if the |
2438 | -- declaration being completed has not been frozen, then inherit the | |
2439 | -- convention of the renamed subprogram prior to checking conformance | |
2440 | -- (unless the renaming has an explicit convention established; the | |
996ae0b0 RK |
2441 | -- rule stated in the RM doesn't seem to address this ???). |
2442 | ||
2443 | if Present (Rename_Spec) then | |
2444 | Generate_Reference (Rename_Spec, Defining_Entity (Spec), 'b'); | |
2445 | Style.Check_Identifier (Defining_Entity (Spec), Rename_Spec); | |
2446 | ||
07fc65c4 GB |
2447 | if not Is_Frozen (Rename_Spec) then |
2448 | if not Has_Convention_Pragma (Rename_Spec) then | |
2449 | Set_Convention (New_S, Convention (Old_S)); | |
2450 | end if; | |
2451 | ||
2452 | if Ekind (Old_S) /= E_Operator then | |
2453 | Check_Mode_Conformant (New_S, Old_S, Spec); | |
2454 | end if; | |
2455 | ||
2456 | if Original_Subprogram (Old_S) = Rename_Spec then | |
2457 | Error_Msg_N ("unfrozen subprogram cannot rename itself ", N); | |
2458 | end if; | |
2459 | else | |
2460 | Check_Subtype_Conformant (New_S, Old_S, Spec); | |
996ae0b0 RK |
2461 | end if; |
2462 | ||
2463 | Check_Frozen_Renaming (N, Rename_Spec); | |
996ae0b0 | 2464 | |
5eb10f25 | 2465 | -- Check explicitly that renamed entity is not intrinsic, because |
16b05213 | 2466 | -- in a generic the renamed body is not built. In this case, |
5eb10f25 ES |
2467 | -- the renaming_as_body is a completion. |
2468 | ||
2469 | if Inside_A_Generic then | |
2470 | if Is_Frozen (Rename_Spec) | |
2471 | and then Is_Intrinsic_Subprogram (Old_S) | |
2472 | then | |
2473 | Error_Msg_N | |
2474 | ("subprogram in renaming_as_body cannot be intrinsic", | |
2475 | Name (N)); | |
2476 | end if; | |
2477 | ||
2478 | Set_Has_Completion (Rename_Spec); | |
2479 | end if; | |
2480 | ||
996ae0b0 | 2481 | elsif Ekind (Old_S) /= E_Operator then |
1138cf59 | 2482 | |
2ba431e5 YM |
2483 | -- If this a defaulted subprogram for a class-wide actual there is |
2484 | -- no check for mode conformance, given that the signatures don't | |
3e24afaa | 2485 | -- match (the source mentions T but the actual mentions T'Class). |
1138cf59 | 2486 | |
afc8324d | 2487 | if CW_Actual then |
1138cf59 | 2488 | null; |
1138cf59 AC |
2489 | else |
2490 | Check_Mode_Conformant (New_S, Old_S); | |
2491 | end if; | |
996ae0b0 RK |
2492 | |
2493 | if Is_Actual | |
2494 | and then Error_Posted (New_S) | |
2495 | then | |
2496 | Error_Msg_NE ("invalid actual subprogram: & #!", N, Old_S); | |
2497 | end if; | |
2498 | end if; | |
2499 | ||
2500 | if No (Rename_Spec) then | |
2501 | ||
2502 | -- The parameter profile of the new entity is that of the renamed | |
2503 | -- entity: the subtypes given in the specification are irrelevant. | |
2504 | ||
2505 | Inherit_Renamed_Profile (New_S, Old_S); | |
2506 | ||
2507 | -- A call to the subprogram is transformed into a call to the | |
2508 | -- renamed entity. This is transitive if the renamed entity is | |
2509 | -- itself a renaming. | |
2510 | ||
2511 | if Present (Alias (Old_S)) then | |
2512 | Set_Alias (New_S, Alias (Old_S)); | |
2513 | else | |
2514 | Set_Alias (New_S, Old_S); | |
2515 | end if; | |
2516 | ||
edd63e9b ES |
2517 | -- Note that we do not set Is_Intrinsic_Subprogram if we have a |
2518 | -- renaming as body, since the entity in this case is not an | |
2519 | -- intrinsic (it calls an intrinsic, but we have a real body for | |
2520 | -- this call, and it is in this body that the required intrinsic | |
2521 | -- processing will take place). | |
996ae0b0 | 2522 | |
edd63e9b ES |
2523 | -- Also, if this is a renaming of inequality, the renamed operator |
2524 | -- is intrinsic, but what matters is the corresponding equality | |
2525 | -- operator, which may be user-defined. | |
fbf5a39b | 2526 | |
996ae0b0 | 2527 | Set_Is_Intrinsic_Subprogram |
fbf5a39b AC |
2528 | (New_S, |
2529 | Is_Intrinsic_Subprogram (Old_S) | |
2530 | and then | |
2531 | (Chars (Old_S) /= Name_Op_Ne | |
2532 | or else Ekind (Old_S) = E_Operator | |
2533 | or else | |
2534 | Is_Intrinsic_Subprogram | |
2535 | (Corresponding_Equality (Old_S)))); | |
996ae0b0 RK |
2536 | |
2537 | if Ekind (Alias (New_S)) = E_Operator then | |
2538 | Set_Has_Delayed_Freeze (New_S, False); | |
2539 | end if; | |
2540 | ||
82c80734 RD |
2541 | -- If the renaming corresponds to an association for an abstract |
2542 | -- formal subprogram, then various attributes must be set to | |
2543 | -- indicate that the renaming is an abstract dispatching operation | |
2544 | -- with a controlling type. | |
2545 | ||
16ca248a ES |
2546 | if Is_Actual and then Is_Abstract_Subprogram (Formal_Spec) then |
2547 | ||
82c80734 RD |
2548 | -- Mark the renaming as abstract here, so Find_Dispatching_Type |
2549 | -- see it as corresponding to a generic association for a | |
2550 | -- formal abstract subprogram | |
2551 | ||
16ca248a | 2552 | Set_Is_Abstract_Subprogram (New_S); |
82c80734 RD |
2553 | |
2554 | declare | |
2555 | New_S_Ctrl_Type : constant Entity_Id := | |
2556 | Find_Dispatching_Type (New_S); | |
2557 | Old_S_Ctrl_Type : constant Entity_Id := | |
2558 | Find_Dispatching_Type (Old_S); | |
2559 | ||
2560 | begin | |
2561 | if Old_S_Ctrl_Type /= New_S_Ctrl_Type then | |
2562 | Error_Msg_NE | |
2563 | ("actual must be dispatching subprogram for type&", | |
2564 | Nam, New_S_Ctrl_Type); | |
2565 | ||
2566 | else | |
2567 | Set_Is_Dispatching_Operation (New_S); | |
2568 | Check_Controlling_Formals (New_S_Ctrl_Type, New_S); | |
2569 | ||
16ca248a ES |
2570 | -- If the actual in the formal subprogram is itself a |
2571 | -- formal abstract subprogram association, there's no | |
2572 | -- dispatch table component or position to inherit. | |
82c80734 RD |
2573 | |
2574 | if Present (DTC_Entity (Old_S)) then | |
2575 | Set_DTC_Entity (New_S, DTC_Entity (Old_S)); | |
2576 | Set_DT_Position (New_S, DT_Position (Old_S)); | |
2577 | end if; | |
2578 | end if; | |
2579 | end; | |
2580 | end if; | |
996ae0b0 RK |
2581 | end if; |
2582 | ||
2583 | if not Is_Actual | |
2584 | and then (Old_S = New_S | |
2585 | or else (Nkind (Nam) /= N_Expanded_Name | |
2586 | and then Chars (Old_S) = Chars (New_S))) | |
2587 | then | |
2588 | Error_Msg_N ("subprogram cannot rename itself", N); | |
2589 | end if; | |
2590 | ||
2591 | Set_Convention (New_S, Convention (Old_S)); | |
16ca248a ES |
2592 | |
2593 | if Is_Abstract_Subprogram (Old_S) then | |
2594 | if Present (Rename_Spec) then | |
2595 | Error_Msg_N | |
2596 | ("a renaming-as-body cannot rename an abstract subprogram", | |
2597 | N); | |
2598 | Set_Has_Completion (Rename_Spec); | |
2599 | else | |
2600 | Set_Is_Abstract_Subprogram (New_S); | |
2601 | end if; | |
2602 | end if; | |
2603 | ||
996ae0b0 RK |
2604 | Check_Library_Unit_Renaming (N, Old_S); |
2605 | ||
edd63e9b ES |
2606 | -- Pathological case: procedure renames entry in the scope of its |
2607 | -- task. Entry is given by simple name, but body must be built for | |
2608 | -- procedure. Of course if called it will deadlock. | |
996ae0b0 RK |
2609 | |
2610 | if Ekind (Old_S) = E_Entry then | |
2611 | Set_Has_Completion (New_S, False); | |
2612 | Set_Alias (New_S, Empty); | |
2613 | end if; | |
2614 | ||
2615 | if Is_Actual then | |
2616 | Freeze_Before (N, Old_S); | |
2617 | Set_Has_Delayed_Freeze (New_S, False); | |
2618 | Freeze_Before (N, New_S); | |
2619 | ||
82c80734 RD |
2620 | -- An abstract subprogram is only allowed as an actual in the case |
2621 | -- where the formal subprogram is also abstract. | |
2622 | ||
996ae0b0 | 2623 | if (Ekind (Old_S) = E_Procedure or else Ekind (Old_S) = E_Function) |
16ca248a ES |
2624 | and then Is_Abstract_Subprogram (Old_S) |
2625 | and then not Is_Abstract_Subprogram (Formal_Spec) | |
996ae0b0 RK |
2626 | then |
2627 | Error_Msg_N | |
2628 | ("abstract subprogram not allowed as generic actual", Nam); | |
2629 | end if; | |
2630 | end if; | |
2631 | ||
2632 | else | |
edd63e9b ES |
2633 | -- A common error is to assume that implicit operators for types are |
2634 | -- defined in Standard, or in the scope of a subtype. In those cases | |
2635 | -- where the renamed entity is given with an expanded name, it is | |
2636 | -- worth mentioning that operators for the type are not declared in | |
2637 | -- the scope given by the prefix. | |
996ae0b0 RK |
2638 | |
2639 | if Nkind (Nam) = N_Expanded_Name | |
2640 | and then Nkind (Selector_Name (Nam)) = N_Operator_Symbol | |
2641 | and then Scope (Entity (Nam)) = Standard_Standard | |
2642 | then | |
2643 | declare | |
2644 | T : constant Entity_Id := | |
2645 | Base_Type (Etype (First_Formal (New_S))); | |
996ae0b0 RK |
2646 | begin |
2647 | Error_Msg_Node_2 := Prefix (Nam); | |
fbf5a39b AC |
2648 | Error_Msg_NE |
2649 | ("operator for type& is not declared in&", Prefix (Nam), T); | |
996ae0b0 | 2650 | end; |
fbf5a39b | 2651 | |
996ae0b0 RK |
2652 | else |
2653 | Error_Msg_NE | |
2654 | ("no visible subprogram matches the specification for&", | |
2655 | Spec, New_S); | |
2656 | end if; | |
2657 | ||
2658 | if Present (Candidate_Renaming) then | |
2659 | declare | |
2660 | F1 : Entity_Id; | |
2661 | F2 : Entity_Id; | |
70b70ce8 | 2662 | T1 : Entity_Id; |
996ae0b0 RK |
2663 | |
2664 | begin | |
2665 | F1 := First_Formal (Candidate_Renaming); | |
2666 | F2 := First_Formal (New_S); | |
70b70ce8 | 2667 | T1 := First_Subtype (Etype (F1)); |
996ae0b0 RK |
2668 | |
2669 | while Present (F1) and then Present (F2) loop | |
2670 | Next_Formal (F1); | |
2671 | Next_Formal (F2); | |
2672 | end loop; | |
2673 | ||
2674 | if Present (F1) and then Present (Default_Value (F1)) then | |
2675 | if Present (Next_Formal (F1)) then | |
2676 | Error_Msg_NE | |
2677 | ("\missing specification for &" & | |
2678 | " and other formals with defaults", Spec, F1); | |
2679 | else | |
2680 | Error_Msg_NE | |
2681 | ("\missing specification for &", Spec, F1); | |
2682 | end if; | |
2683 | end if; | |
70b70ce8 AC |
2684 | |
2685 | if Nkind (Nam) = N_Operator_Symbol | |
2686 | and then From_Default (N) | |
2687 | then | |
2688 | Error_Msg_Node_2 := T1; | |
2689 | Error_Msg_NE | |
2690 | ("default & on & is not directly visible", | |
2691 | Nam, Nam); | |
2692 | end if; | |
996ae0b0 RK |
2693 | end; |
2694 | end if; | |
2695 | end if; | |
2696 | ||
edd63e9b ES |
2697 | -- Ada 2005 AI 404: if the new subprogram is dispatching, verify that |
2698 | -- controlling access parameters are known non-null for the renamed | |
2699 | -- subprogram. Test also applies to a subprogram instantiation that | |
cdc8c54c BD |
2700 | -- is dispatching. Test is skipped if some previous error was detected |
2701 | -- that set Old_S to Any_Id. | |
edd63e9b | 2702 | |
0791fbe9 | 2703 | if Ada_Version >= Ada_2005 |
cdc8c54c | 2704 | and then Old_S /= Any_Id |
edd63e9b ES |
2705 | and then not Is_Dispatching_Operation (Old_S) |
2706 | and then Is_Dispatching_Operation (New_S) | |
2707 | then | |
2708 | declare | |
2709 | Old_F : Entity_Id; | |
2710 | New_F : Entity_Id; | |
2711 | ||
2712 | begin | |
2713 | Old_F := First_Formal (Old_S); | |
2714 | New_F := First_Formal (New_S); | |
2715 | while Present (Old_F) loop | |
2716 | if Ekind (Etype (Old_F)) = E_Anonymous_Access_Type | |
2717 | and then Is_Controlling_Formal (New_F) | |
2718 | and then not Can_Never_Be_Null (Old_F) | |
2719 | then | |
2720 | Error_Msg_N ("access parameter is controlling,", New_F); | |
fbe627af RD |
2721 | Error_Msg_NE |
2722 | ("\corresponding parameter of& " | |
2723 | & "must be explicitly null excluding", New_F, Old_S); | |
edd63e9b ES |
2724 | end if; |
2725 | ||
2726 | Next_Formal (Old_F); | |
2727 | Next_Formal (New_F); | |
2728 | end loop; | |
2729 | end; | |
2730 | end if; | |
2731 | ||
725393ea | 2732 | -- A useful warning, suggested by Ada Bug Finder (Ada-Europe 2005) |
b5c739f9 | 2733 | -- is to warn if an operator is being renamed as a different operator. |
880dabb5 AC |
2734 | -- If the operator is predefined, examine the kind of the entity, not |
2735 | -- the abbreviated declaration in Standard. | |
725393ea ES |
2736 | |
2737 | if Comes_From_Source (N) | |
2738 | and then Present (Old_S) | |
880dabb5 AC |
2739 | and then |
2740 | (Nkind (Old_S) = N_Defining_Operator_Symbol | |
2741 | or else Ekind (Old_S) = E_Operator) | |
725393ea ES |
2742 | and then Nkind (New_S) = N_Defining_Operator_Symbol |
2743 | and then Chars (Old_S) /= Chars (New_S) | |
2744 | then | |
2745 | Error_Msg_NE | |
880dabb5 | 2746 | ("?& is being renamed as a different operator", N, Old_S); |
725393ea ES |
2747 | end if; |
2748 | ||
b5c739f9 RD |
2749 | -- Check for renaming of obsolescent subprogram |
2750 | ||
2751 | Check_Obsolescent_2005_Entity (Entity (Nam), Nam); | |
2752 | ||
11560bcc TQ |
2753 | -- Another warning or some utility: if the new subprogram as the same |
2754 | -- name as the old one, the old one is not hidden by an outer homograph, | |
2755 | -- the new one is not a public symbol, and the old one is otherwise | |
2756 | -- directly visible, the renaming is superfluous. | |
2757 | ||
2758 | if Chars (Old_S) = Chars (New_S) | |
2759 | and then Comes_From_Source (N) | |
2760 | and then Scope (Old_S) /= Standard_Standard | |
2761 | and then Warn_On_Redundant_Constructs | |
2762 | and then | |
2763 | (Is_Immediately_Visible (Old_S) | |
2764 | or else Is_Potentially_Use_Visible (Old_S)) | |
2765 | and then Is_Overloadable (Current_Scope) | |
2766 | and then Chars (Current_Scope) /= Chars (Old_S) | |
2767 | then | |
2768 | Error_Msg_N | |
2769 | ("?redundant renaming, entity is directly visible", Name (N)); | |
2770 | end if; | |
2771 | ||
0ab80019 | 2772 | Ada_Version := Save_AV; |
edd63e9b | 2773 | Ada_Version_Explicit := Save_AV_Exp; |
996ae0b0 RK |
2774 | end Analyze_Subprogram_Renaming; |
2775 | ||
2776 | ------------------------- | |
2777 | -- Analyze_Use_Package -- | |
2778 | ------------------------- | |
2779 | ||
2780 | -- Resolve the package names in the use clause, and make all the visible | |
2781 | -- entities defined in the package potentially use-visible. If the package | |
2782 | -- is already in use from a previous use clause, its visible entities are | |
2783 | -- already use-visible. In that case, mark the occurrence as a redundant | |
2784 | -- use. If the package is an open scope, i.e. if the use clause occurs | |
2785 | -- within the package itself, ignore it. | |
2786 | ||
2787 | procedure Analyze_Use_Package (N : Node_Id) is | |
2788 | Pack_Name : Node_Id; | |
2789 | Pack : Entity_Id; | |
2790 | ||
996ae0b0 RK |
2791 | -- Start of processing for Analyze_Use_Package |
2792 | ||
2793 | begin | |
2ba431e5 | 2794 | Check_SPARK_Restriction ("use clause is not allowed", N); |
1d801f21 | 2795 | |
996ae0b0 RK |
2796 | Set_Hidden_By_Use_Clause (N, No_Elist); |
2797 | ||
7394c8cc AC |
2798 | -- Use clause not allowed in a spec of a predefined package declaration |
2799 | -- except that packages whose file name starts a-n are OK (these are | |
2800 | -- children of Ada.Numerics, which are never loaded by Rtsfind). | |
996ae0b0 RK |
2801 | |
2802 | if Is_Predefined_File_Name (Unit_File_Name (Current_Sem_Unit)) | |
2803 | and then Name_Buffer (1 .. 3) /= "a-n" | |
2804 | and then | |
2805 | Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Declaration | |
2806 | then | |
2807 | Error_Msg_N ("use clause not allowed in predefined spec", N); | |
2808 | end if; | |
2809 | ||
bc41faa2 | 2810 | -- Chain clause to list of use clauses in current scope |
996ae0b0 RK |
2811 | |
2812 | if Nkind (Parent (N)) /= N_Compilation_Unit then | |
2813 | Chain_Use_Clause (N); | |
2814 | end if; | |
2815 | ||
2816 | -- Loop through package names to identify referenced packages | |
2817 | ||
2818 | Pack_Name := First (Names (N)); | |
996ae0b0 RK |
2819 | while Present (Pack_Name) loop |
2820 | Analyze (Pack_Name); | |
2821 | ||
2822 | if Nkind (Parent (N)) = N_Compilation_Unit | |
2823 | and then Nkind (Pack_Name) = N_Expanded_Name | |
2824 | then | |
2825 | declare | |
16ca248a | 2826 | Pref : Node_Id; |
996ae0b0 RK |
2827 | |
2828 | begin | |
16ca248a | 2829 | Pref := Prefix (Pack_Name); |
996ae0b0 RK |
2830 | while Nkind (Pref) = N_Expanded_Name loop |
2831 | Pref := Prefix (Pref); | |
2832 | end loop; | |
2833 | ||
2834 | if Entity (Pref) = Standard_Standard then | |
2835 | Error_Msg_N | |
2836 | ("predefined package Standard cannot appear" | |
2837 | & " in a context clause", Pref); | |
2838 | end if; | |
2839 | end; | |
2840 | end if; | |
2841 | ||
2842 | Next (Pack_Name); | |
2843 | end loop; | |
2844 | ||
2845 | -- Loop through package names to mark all entities as potentially | |
2846 | -- use visible. | |
2847 | ||
2848 | Pack_Name := First (Names (N)); | |
996ae0b0 | 2849 | while Present (Pack_Name) loop |
996ae0b0 RK |
2850 | if Is_Entity_Name (Pack_Name) then |
2851 | Pack := Entity (Pack_Name); | |
2852 | ||
2853 | if Ekind (Pack) /= E_Package | |
2854 | and then Etype (Pack) /= Any_Type | |
2855 | then | |
2856 | if Ekind (Pack) = E_Generic_Package then | |
483c78cb | 2857 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
2858 | ("a generic package is not allowed in a use clause", |
2859 | Pack_Name); | |
2860 | else | |
ed2233dc | 2861 | Error_Msg_N ("& is not a usable package", Pack_Name); |
996ae0b0 RK |
2862 | end if; |
2863 | ||
fbf5a39b AC |
2864 | else |
2865 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
2866 | Check_In_Previous_With_Clause (N, Pack_Name); | |
2867 | end if; | |
996ae0b0 | 2868 | |
fbf5a39b AC |
2869 | if Applicable_Use (Pack_Name) then |
2870 | Use_One_Package (Pack, N); | |
2871 | end if; | |
996ae0b0 | 2872 | end if; |
462c31ef ST |
2873 | |
2874 | -- Report error because name denotes something other than a package | |
2875 | ||
2876 | else | |
2877 | Error_Msg_N ("& is not a package", Pack_Name); | |
996ae0b0 RK |
2878 | end if; |
2879 | ||
2880 | Next (Pack_Name); | |
2881 | end loop; | |
996ae0b0 RK |
2882 | end Analyze_Use_Package; |
2883 | ||
2884 | ---------------------- | |
2885 | -- Analyze_Use_Type -- | |
2886 | ---------------------- | |
2887 | ||
2888 | procedure Analyze_Use_Type (N : Node_Id) is | |
954c111a | 2889 | E : Entity_Id; |
ecc4ddde | 2890 | Id : Node_Id; |
996ae0b0 RK |
2891 | |
2892 | begin | |
2893 | Set_Hidden_By_Use_Clause (N, No_Elist); | |
2894 | ||
bc41faa2 | 2895 | -- Chain clause to list of use clauses in current scope |
996ae0b0 RK |
2896 | |
2897 | if Nkind (Parent (N)) /= N_Compilation_Unit then | |
2898 | Chain_Use_Clause (N); | |
2899 | end if; | |
2900 | ||
780d052e RD |
2901 | -- If the Used_Operations list is already initialized, the clause has |
2902 | -- been analyzed previously, and it is begin reinstalled, for example | |
2903 | -- when the clause appears in a package spec and we are compiling the | |
2904 | -- corresponding package body. In that case, make the entities on the | |
806f6d37 | 2905 | -- existing list use_visible, and mark the corresponding types In_Use. |
29efbb8c | 2906 | |
780d052e | 2907 | if Present (Used_Operations (N)) then |
29efbb8c | 2908 | declare |
806f6d37 | 2909 | Mark : Node_Id; |
29efbb8c | 2910 | Elmt : Elmt_Id; |
806f6d37 | 2911 | |
29efbb8c | 2912 | begin |
806f6d37 AC |
2913 | Mark := First (Subtype_Marks (N)); |
2914 | while Present (Mark) loop | |
7ff2d234 | 2915 | Use_One_Type (Mark, Installed => True); |
806f6d37 AC |
2916 | Next (Mark); |
2917 | end loop; | |
2918 | ||
29efbb8c ES |
2919 | Elmt := First_Elmt (Used_Operations (N)); |
2920 | while Present (Elmt) loop | |
2921 | Set_Is_Potentially_Use_Visible (Node (Elmt)); | |
2922 | Next_Elmt (Elmt); | |
2923 | end loop; | |
2924 | end; | |
2925 | ||
2926 | return; | |
2927 | end if; | |
2928 | ||
780d052e RD |
2929 | -- Otherwise, create new list and attach to it the operations that |
2930 | -- are made use-visible by the clause. | |
2931 | ||
29efbb8c | 2932 | Set_Used_Operations (N, New_Elmt_List); |
996ae0b0 | 2933 | Id := First (Subtype_Marks (N)); |
996ae0b0 RK |
2934 | while Present (Id) loop |
2935 | Find_Type (Id); | |
954c111a | 2936 | E := Entity (Id); |
996ae0b0 | 2937 | |
954c111a | 2938 | if E /= Any_Type then |
07fc65c4 | 2939 | Use_One_Type (Id); |
fbf5a39b AC |
2940 | |
2941 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
923fa078 | 2942 | if Nkind (Id) = N_Identifier then |
edd63e9b | 2943 | Error_Msg_N ("type is not directly visible", Id); |
fbf5a39b | 2944 | |
954c111a HK |
2945 | elsif Is_Child_Unit (Scope (E)) |
2946 | and then Scope (E) /= System_Aux_Id | |
fbf5a39b AC |
2947 | then |
2948 | Check_In_Previous_With_Clause (N, Prefix (Id)); | |
2949 | end if; | |
2950 | end if; | |
ecc4ddde AC |
2951 | |
2952 | else | |
4c8a5bb8 | 2953 | -- If the use_type_clause appears in a compilation unit context, |
ecc4ddde | 2954 | -- check whether it comes from a unit that may appear in a |
4c8a5bb8 | 2955 | -- limited_with_clause, for a better error message. |
ecc4ddde AC |
2956 | |
2957 | if Nkind (Parent (N)) = N_Compilation_Unit | |
2958 | and then Nkind (Id) /= N_Identifier | |
2959 | then | |
2960 | declare | |
2961 | Item : Node_Id; | |
2962 | Pref : Node_Id; | |
2963 | ||
2964 | function Mentioned (Nam : Node_Id) return Boolean; | |
4c8a5bb8 AC |
2965 | -- Check whether the prefix of expanded name for the type |
2966 | -- appears in the prefix of some limited_with_clause. | |
2967 | ||
2968 | --------------- | |
2969 | -- Mentioned -- | |
2970 | --------------- | |
ecc4ddde AC |
2971 | |
2972 | function Mentioned (Nam : Node_Id) return Boolean is | |
2973 | begin | |
4c8a5bb8 AC |
2974 | return Nkind (Name (Item)) = N_Selected_Component |
2975 | and then | |
2976 | Chars (Prefix (Name (Item))) = Chars (Nam); | |
ecc4ddde AC |
2977 | end Mentioned; |
2978 | ||
2979 | begin | |
2980 | Pref := Prefix (Id); | |
2981 | Item := First (Context_Items (Parent (N))); | |
4c8a5bb8 AC |
2982 | |
2983 | while Present (Item) and then Item /= N loop | |
ecc4ddde AC |
2984 | if Nkind (Item) = N_With_Clause |
2985 | and then Limited_Present (Item) | |
2986 | and then Mentioned (Pref) | |
2987 | then | |
4c8a5bb8 AC |
2988 | Change_Error_Text |
2989 | (Get_Msg_Id, "premature usage of incomplete type"); | |
ecc4ddde AC |
2990 | end if; |
2991 | ||
2992 | Next (Item); | |
2993 | end loop; | |
2994 | end; | |
2995 | end if; | |
996ae0b0 RK |
2996 | end if; |
2997 | ||
2998 | Next (Id); | |
2999 | end loop; | |
3000 | end Analyze_Use_Type; | |
3001 | ||
3002 | -------------------- | |
3003 | -- Applicable_Use -- | |
3004 | -------------------- | |
3005 | ||
3006 | function Applicable_Use (Pack_Name : Node_Id) return Boolean is | |
3007 | Pack : constant Entity_Id := Entity (Pack_Name); | |
3008 | ||
3009 | begin | |
3010 | if In_Open_Scopes (Pack) then | |
954c111a HK |
3011 | if Warn_On_Redundant_Constructs |
3012 | and then Pack = Current_Scope | |
3013 | then | |
ed2233dc | 3014 | Error_Msg_NE -- CODEFIX |
954c111a HK |
3015 | ("& is already use-visible within itself?", Pack_Name, Pack); |
3016 | end if; | |
3017 | ||
996ae0b0 RK |
3018 | return False; |
3019 | ||
3020 | elsif In_Use (Pack) then | |
d4810530 | 3021 | Note_Redundant_Use (Pack_Name); |
996ae0b0 RK |
3022 | return False; |
3023 | ||
3024 | elsif Present (Renamed_Object (Pack)) | |
3025 | and then In_Use (Renamed_Object (Pack)) | |
3026 | then | |
d4810530 | 3027 | Note_Redundant_Use (Pack_Name); |
996ae0b0 RK |
3028 | return False; |
3029 | ||
3030 | else | |
3031 | return True; | |
3032 | end if; | |
3033 | end Applicable_Use; | |
3034 | ||
3035 | ------------------------ | |
3036 | -- Attribute_Renaming -- | |
3037 | ------------------------ | |
3038 | ||
3039 | procedure Attribute_Renaming (N : Node_Id) is | |
3040 | Loc : constant Source_Ptr := Sloc (N); | |
3041 | Nam : constant Node_Id := Name (N); | |
3042 | Spec : constant Node_Id := Specification (N); | |
3043 | New_S : constant Entity_Id := Defining_Unit_Name (Spec); | |
3044 | Aname : constant Name_Id := Attribute_Name (Nam); | |
3045 | ||
3046 | Form_Num : Nat := 0; | |
3047 | Expr_List : List_Id := No_List; | |
3048 | ||
3049 | Attr_Node : Node_Id; | |
3050 | Body_Node : Node_Id; | |
3051 | Param_Spec : Node_Id; | |
3052 | ||
3053 | begin | |
3054 | Generate_Definition (New_S); | |
3055 | ||
4c8a5bb8 AC |
3056 | -- This procedure is called in the context of subprogram renaming, and |
3057 | -- thus the attribute must be one that is a subprogram. All of those | |
3058 | -- have at least one formal parameter, with the singular exception of | |
3059 | -- AST_Entry (which is a real oddity, it is odd that this can be renamed | |
3060 | -- at all!) | |
996ae0b0 RK |
3061 | |
3062 | if not Is_Non_Empty_List (Parameter_Specifications (Spec)) then | |
3063 | if Aname /= Name_AST_Entry then | |
3064 | Error_Msg_N | |
3065 | ("subprogram renaming an attribute must have formals", N); | |
3066 | return; | |
3067 | end if; | |
3068 | ||
3069 | else | |
3070 | Param_Spec := First (Parameter_Specifications (Spec)); | |
996ae0b0 RK |
3071 | while Present (Param_Spec) loop |
3072 | Form_Num := Form_Num + 1; | |
3073 | ||
3074 | if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then | |
3075 | Find_Type (Parameter_Type (Param_Spec)); | |
3076 | ||
3077 | -- The profile of the new entity denotes the base type (s) of | |
3078 | -- the types given in the specification. For access parameters | |
3079 | -- there are no subtypes involved. | |
3080 | ||
3081 | Rewrite (Parameter_Type (Param_Spec), | |
3082 | New_Reference_To | |
3083 | (Base_Type (Entity (Parameter_Type (Param_Spec))), Loc)); | |
3084 | end if; | |
3085 | ||
3086 | if No (Expr_List) then | |
3087 | Expr_List := New_List; | |
3088 | end if; | |
3089 | ||
3090 | Append_To (Expr_List, | |
3091 | Make_Identifier (Loc, | |
3092 | Chars => Chars (Defining_Identifier (Param_Spec)))); | |
3093 | ||
fbf5a39b | 3094 | -- The expressions in the attribute reference are not freeze |
4c8a5bb8 | 3095 | -- points. Neither is the attribute as a whole, see below. |
fbf5a39b AC |
3096 | |
3097 | Set_Must_Not_Freeze (Last (Expr_List)); | |
996ae0b0 RK |
3098 | Next (Param_Spec); |
3099 | end loop; | |
3100 | end if; | |
3101 | ||
4c8a5bb8 AC |
3102 | -- Immediate error if too many formals. Other mismatches in number or |
3103 | -- types of parameters are detected when we analyze the body of the | |
3104 | -- subprogram that we construct. | |
996ae0b0 RK |
3105 | |
3106 | if Form_Num > 2 then | |
3107 | Error_Msg_N ("too many formals for attribute", N); | |
3108 | ||
4c8a5bb8 AC |
3109 | -- Error if the attribute reference has expressions that look like |
3110 | -- formal parameters. | |
0da2c8ac AC |
3111 | |
3112 | elsif Present (Expressions (Nam)) then | |
3113 | Error_Msg_N ("illegal expressions in attribute reference", Nam); | |
3114 | ||
996ae0b0 RK |
3115 | elsif |
3116 | Aname = Name_Compose or else | |
3117 | Aname = Name_Exponent or else | |
3118 | Aname = Name_Leading_Part or else | |
3119 | Aname = Name_Pos or else | |
3120 | Aname = Name_Round or else | |
3121 | Aname = Name_Scaling or else | |
3122 | Aname = Name_Val | |
3123 | then | |
3124 | if Nkind (N) = N_Subprogram_Renaming_Declaration | |
82c80734 | 3125 | and then Present (Corresponding_Formal_Spec (N)) |
996ae0b0 RK |
3126 | then |
3127 | Error_Msg_N | |
3128 | ("generic actual cannot be attribute involving universal type", | |
3129 | Nam); | |
3130 | else | |
3131 | Error_Msg_N | |
3132 | ("attribute involving a universal type cannot be renamed", | |
3133 | Nam); | |
3134 | end if; | |
3135 | end if; | |
3136 | ||
4c8a5bb8 AC |
3137 | -- AST_Entry is an odd case. It doesn't really make much sense to allow |
3138 | -- it to be renamed, but that's the DEC rule, so we have to do it right. | |
3139 | -- The point is that the AST_Entry call should be made now, and what the | |
3140 | -- function will return is the returned value. | |
996ae0b0 RK |
3141 | |
3142 | -- Note that there is no Expr_List in this case anyway | |
3143 | ||
3144 | if Aname = Name_AST_Entry then | |
996ae0b0 | 3145 | declare |
092ef350 | 3146 | Ent : constant Entity_Id := Make_Temporary (Loc, 'R', Nam); |
996ae0b0 RK |
3147 | Decl : Node_Id; |
3148 | ||
3149 | begin | |
996ae0b0 RK |
3150 | Decl := |
3151 | Make_Object_Declaration (Loc, | |
3152 | Defining_Identifier => Ent, | |
092ef350 | 3153 | Object_Definition => |
996ae0b0 | 3154 | New_Occurrence_Of (RTE (RE_AST_Handler), Loc), |
092ef350 RD |
3155 | Expression => Nam, |
3156 | Constant_Present => True); | |
996ae0b0 RK |
3157 | |
3158 | Set_Assignment_OK (Decl, True); | |
3159 | Insert_Action (N, Decl); | |
3160 | Attr_Node := Make_Identifier (Loc, Chars (Ent)); | |
3161 | end; | |
3162 | ||
3163 | -- For all other attributes, we rewrite the attribute node to have | |
3164 | -- a list of expressions corresponding to the subprogram formals. | |
3165 | -- A renaming declaration is not a freeze point, and the analysis of | |
3166 | -- the attribute reference should not freeze the type of the prefix. | |
3167 | ||
3168 | else | |
3169 | Attr_Node := | |
3170 | Make_Attribute_Reference (Loc, | |
3171 | Prefix => Prefix (Nam), | |
3172 | Attribute_Name => Aname, | |
3173 | Expressions => Expr_List); | |
3174 | ||
3175 | Set_Must_Not_Freeze (Attr_Node); | |
3176 | Set_Must_Not_Freeze (Prefix (Nam)); | |
3177 | end if; | |
3178 | ||
3179 | -- Case of renaming a function | |
3180 | ||
3181 | if Nkind (Spec) = N_Function_Specification then | |
996ae0b0 RK |
3182 | if Is_Procedure_Attribute_Name (Aname) then |
3183 | Error_Msg_N ("attribute can only be renamed as procedure", Nam); | |
3184 | return; | |
3185 | end if; | |
3186 | ||
725393ea ES |
3187 | Find_Type (Result_Definition (Spec)); |
3188 | Rewrite (Result_Definition (Spec), | |
3189 | New_Reference_To ( | |
3190 | Base_Type (Entity (Result_Definition (Spec))), Loc)); | |
996ae0b0 RK |
3191 | |
3192 | Body_Node := | |
3193 | Make_Subprogram_Body (Loc, | |
3194 | Specification => Spec, | |
3195 | Declarations => New_List, | |
3196 | Handled_Statement_Sequence => | |
3197 | Make_Handled_Sequence_Of_Statements (Loc, | |
3198 | Statements => New_List ( | |
11560bcc | 3199 | Make_Simple_Return_Statement (Loc, |
996ae0b0 RK |
3200 | Expression => Attr_Node)))); |
3201 | ||
3202 | -- Case of renaming a procedure | |
3203 | ||
3204 | else | |
3205 | if not Is_Procedure_Attribute_Name (Aname) then | |
3206 | Error_Msg_N ("attribute can only be renamed as function", Nam); | |
3207 | return; | |
3208 | end if; | |
3209 | ||
3210 | Body_Node := | |
3211 | Make_Subprogram_Body (Loc, | |
3212 | Specification => Spec, | |
3213 | Declarations => New_List, | |
3214 | Handled_Statement_Sequence => | |
3215 | Make_Handled_Sequence_Of_Statements (Loc, | |
3216 | Statements => New_List (Attr_Node))); | |
3217 | end if; | |
3218 | ||
fbe627af RD |
3219 | -- In case of tagged types we add the body of the generated function to |
3220 | -- the freezing actions of the type (because in the general case such | |
3221 | -- type is still not frozen). We exclude from this processing generic | |
3222 | -- formal subprograms found in instantiations and AST_Entry renamings. | |
3223 | ||
ddc1515a AC |
3224 | -- We must exclude VM targets because entity AST_Handler is defined in |
3225 | -- package System.Aux_Dec which is not available in those platforms. | |
3226 | ||
3227 | if VM_Target = No_VM | |
3228 | and then not Present (Corresponding_Formal_Spec (N)) | |
fbe627af RD |
3229 | and then Etype (Nam) /= RTE (RE_AST_Handler) |
3230 | then | |
3231 | declare | |
3232 | P : constant Entity_Id := Prefix (Nam); | |
3233 | ||
3234 | begin | |
3235 | Find_Type (P); | |
3236 | ||
3237 | if Is_Tagged_Type (Etype (P)) then | |
3238 | Ensure_Freeze_Node (Etype (P)); | |
3239 | Append_Freeze_Action (Etype (P), Body_Node); | |
3240 | else | |
3241 | Rewrite (N, Body_Node); | |
3242 | Analyze (N); | |
3243 | Set_Etype (New_S, Base_Type (Etype (New_S))); | |
3244 | end if; | |
3245 | end; | |
3246 | ||
3247 | -- Generic formal subprograms or AST_Handler renaming | |
3248 | ||
3249 | else | |
3250 | Rewrite (N, Body_Node); | |
3251 | Analyze (N); | |
3252 | Set_Etype (New_S, Base_Type (Etype (New_S))); | |
3253 | end if; | |
996ae0b0 | 3254 | |
615cbd95 AC |
3255 | if Is_Compilation_Unit (New_S) then |
3256 | Error_Msg_N | |
3257 | ("a library unit can only rename another library unit", N); | |
3258 | end if; | |
3259 | ||
996ae0b0 RK |
3260 | -- We suppress elaboration warnings for the resulting entity, since |
3261 | -- clearly they are not needed, and more particularly, in the case | |
3262 | -- of a generic formal subprogram, the resulting entity can appear | |
3263 | -- after the instantiation itself, and thus look like a bogus case | |
3264 | -- of access before elaboration. | |
3265 | ||
3266 | Set_Suppress_Elaboration_Warnings (New_S); | |
3267 | ||
3268 | end Attribute_Renaming; | |
3269 | ||
3270 | ---------------------- | |
3271 | -- Chain_Use_Clause -- | |
3272 | ---------------------- | |
3273 | ||
3274 | procedure Chain_Use_Clause (N : Node_Id) is | |
d4810530 ES |
3275 | Pack : Entity_Id; |
3276 | Level : Int := Scope_Stack.Last; | |
3277 | ||
996ae0b0 | 3278 | begin |
d4810530 ES |
3279 | if not Is_Compilation_Unit (Current_Scope) |
3280 | or else not Is_Child_Unit (Current_Scope) | |
3281 | then | |
3282 | null; -- Common case | |
3283 | ||
3284 | elsif Defining_Entity (Parent (N)) = Current_Scope then | |
3285 | null; -- Common case for compilation unit | |
3286 | ||
3287 | else | |
3288 | -- If declaration appears in some other scope, it must be in some | |
3289 | -- parent unit when compiling a child. | |
3290 | ||
3291 | Pack := Defining_Entity (Parent (N)); | |
3292 | if not In_Open_Scopes (Pack) then | |
3293 | null; -- default as well | |
3294 | ||
3295 | else | |
3296 | -- Find entry for parent unit in scope stack | |
3297 | ||
3298 | while Scope_Stack.Table (Level).Entity /= Pack loop | |
3299 | Level := Level - 1; | |
3300 | end loop; | |
3301 | end if; | |
3302 | end if; | |
3303 | ||
996ae0b0 | 3304 | Set_Next_Use_Clause (N, |
d4810530 ES |
3305 | Scope_Stack.Table (Level).First_Use_Clause); |
3306 | Scope_Stack.Table (Level).First_Use_Clause := N; | |
996ae0b0 RK |
3307 | end Chain_Use_Clause; |
3308 | ||
15ce9ca2 AC |
3309 | --------------------------- |
3310 | -- Check_Frozen_Renaming -- | |
3311 | --------------------------- | |
996ae0b0 RK |
3312 | |
3313 | procedure Check_Frozen_Renaming (N : Node_Id; Subp : Entity_Id) is | |
3314 | B_Node : Node_Id; | |
3315 | Old_S : Entity_Id; | |
3316 | ||
3317 | begin | |
3318 | if Is_Frozen (Subp) | |
3319 | and then not Has_Completion (Subp) | |
3320 | then | |
3321 | B_Node := | |
3322 | Build_Renamed_Body | |
3323 | (Parent (Declaration_Node (Subp)), Defining_Entity (N)); | |
3324 | ||
3325 | if Is_Entity_Name (Name (N)) then | |
3326 | Old_S := Entity (Name (N)); | |
3327 | ||
fbf5a39b AC |
3328 | if not Is_Frozen (Old_S) |
3329 | and then Operating_Mode /= Check_Semantics | |
3330 | then | |
3331 | Append_Freeze_Action (Old_S, B_Node); | |
996ae0b0 RK |
3332 | else |
3333 | Insert_After (N, B_Node); | |
3334 | Analyze (B_Node); | |
3335 | end if; | |
3336 | ||
3337 | if Is_Intrinsic_Subprogram (Old_S) | |
3338 | and then not In_Instance | |
3339 | then | |
3340 | Error_Msg_N | |
3341 | ("subprogram used in renaming_as_body cannot be intrinsic", | |
3342 | Name (N)); | |
3343 | end if; | |
3344 | ||
3345 | else | |
3346 | Insert_After (N, B_Node); | |
3347 | Analyze (B_Node); | |
3348 | end if; | |
3349 | end if; | |
3350 | end Check_Frozen_Renaming; | |
3351 | ||
4c484f40 AC |
3352 | ------------------------------- |
3353 | -- Set_Entity_Or_Discriminal -- | |
3354 | ------------------------------- | |
3355 | ||
3356 | procedure Set_Entity_Or_Discriminal (N : Node_Id; E : Entity_Id) is | |
3357 | P : Node_Id; | |
3358 | ||
3359 | begin | |
3360 | -- If the entity is not a discriminant, or else expansion is disabled, | |
3361 | -- simply set the entity. | |
3362 | ||
3363 | if not In_Spec_Expression | |
3364 | or else Ekind (E) /= E_Discriminant | |
3365 | or else Inside_A_Generic | |
3366 | then | |
3367 | Set_Entity_With_Style_Check (N, E); | |
3368 | ||
3369 | -- The replacement of a discriminant by the corresponding discriminal | |
3370 | -- is not done for a task discriminant that appears in a default | |
8779dffa | 3371 | -- expression of an entry parameter. See Exp_Ch2.Expand_Discriminant |
4c484f40 AC |
3372 | -- for details on their handling. |
3373 | ||
3374 | elsif Is_Concurrent_Type (Scope (E)) then | |
3375 | ||
3376 | P := Parent (N); | |
3377 | while Present (P) | |
3378 | and then not Nkind_In (P, N_Parameter_Specification, | |
3379 | N_Component_Declaration) | |
3380 | loop | |
3381 | P := Parent (P); | |
3382 | end loop; | |
3383 | ||
3384 | if Present (P) | |
3385 | and then Nkind (P) = N_Parameter_Specification | |
3386 | then | |
3387 | null; | |
3388 | ||
3389 | else | |
3390 | Set_Entity (N, Discriminal (E)); | |
3391 | end if; | |
3392 | ||
3393 | -- Otherwise, this is a discriminant in a context in which | |
3394 | -- it is a reference to the corresponding parameter of the | |
3395 | -- init proc for the enclosing type. | |
3396 | ||
3397 | else | |
3398 | Set_Entity (N, Discriminal (E)); | |
3399 | end if; | |
3400 | end Set_Entity_Or_Discriminal; | |
3401 | ||
fbf5a39b AC |
3402 | ----------------------------------- |
3403 | -- Check_In_Previous_With_Clause -- | |
3404 | ----------------------------------- | |
3405 | ||
3406 | procedure Check_In_Previous_With_Clause | |
3407 | (N : Node_Id; | |
3408 | Nam : Entity_Id) | |
3409 | is | |
3410 | Pack : constant Entity_Id := Entity (Original_Node (Nam)); | |
3411 | Item : Node_Id; | |
3412 | Par : Node_Id; | |
3413 | ||
3414 | begin | |
3415 | Item := First (Context_Items (Parent (N))); | |
3416 | ||
3417 | while Present (Item) | |
3418 | and then Item /= N | |
3419 | loop | |
3420 | if Nkind (Item) = N_With_Clause | |
edd63e9b | 3421 | |
16ca248a | 3422 | -- Protect the frontend against previous critical errors |
edd63e9b ES |
3423 | |
3424 | and then Nkind (Name (Item)) /= N_Selected_Component | |
fbf5a39b AC |
3425 | and then Entity (Name (Item)) = Pack |
3426 | then | |
3427 | Par := Nam; | |
3428 | ||
bc41faa2 | 3429 | -- Find root library unit in with_clause |
fbf5a39b AC |
3430 | |
3431 | while Nkind (Par) = N_Expanded_Name loop | |
3432 | Par := Prefix (Par); | |
3433 | end loop; | |
3434 | ||
3435 | if Is_Child_Unit (Entity (Original_Node (Par))) then | |
ed2233dc | 3436 | Error_Msg_NE ("& is not directly visible", Par, Entity (Par)); |
fbf5a39b AC |
3437 | else |
3438 | return; | |
3439 | end if; | |
3440 | end if; | |
3441 | ||
3442 | Next (Item); | |
3443 | end loop; | |
3444 | ||
3445 | -- On exit, package is not mentioned in a previous with_clause. | |
3446 | -- Check if its prefix is. | |
3447 | ||
3448 | if Nkind (Nam) = N_Expanded_Name then | |
3449 | Check_In_Previous_With_Clause (N, Prefix (Nam)); | |
3450 | ||
3451 | elsif Pack /= Any_Id then | |
3452 | Error_Msg_NE ("& is not visible", Nam, Pack); | |
3453 | end if; | |
3454 | end Check_In_Previous_With_Clause; | |
3455 | ||
996ae0b0 RK |
3456 | --------------------------------- |
3457 | -- Check_Library_Unit_Renaming -- | |
3458 | --------------------------------- | |
3459 | ||
3460 | procedure Check_Library_Unit_Renaming (N : Node_Id; Old_E : Entity_Id) is | |
3461 | New_E : Entity_Id; | |
3462 | ||
3463 | begin | |
3464 | if Nkind (Parent (N)) /= N_Compilation_Unit then | |
3465 | return; | |
3466 | ||
fbe627af RD |
3467 | -- Check for library unit. Note that we used to check for the scope |
3468 | -- being Standard here, but that was wrong for Standard itself. | |
3469 | ||
3470 | elsif not Is_Compilation_Unit (Old_E) | |
996ae0b0 RK |
3471 | and then not Is_Child_Unit (Old_E) |
3472 | then | |
3473 | Error_Msg_N ("renamed unit must be a library unit", Name (N)); | |
3474 | ||
615cbd95 AC |
3475 | -- Entities defined in Standard (operators and boolean literals) cannot |
3476 | -- be renamed as library units. | |
3477 | ||
3478 | elsif Scope (Old_E) = Standard_Standard | |
3479 | and then Sloc (Old_E) = Standard_Location | |
3480 | then | |
3481 | Error_Msg_N ("renamed unit must be a library unit", Name (N)); | |
3482 | ||
996ae0b0 RK |
3483 | elsif Present (Parent_Spec (N)) |
3484 | and then Nkind (Unit (Parent_Spec (N))) = N_Generic_Package_Declaration | |
3485 | and then not Is_Child_Unit (Old_E) | |
3486 | then | |
3487 | Error_Msg_N | |
3488 | ("renamed unit must be a child unit of generic parent", Name (N)); | |
3489 | ||
3490 | elsif Nkind (N) in N_Generic_Renaming_Declaration | |
3491 | and then Nkind (Name (N)) = N_Expanded_Name | |
3492 | and then Is_Generic_Instance (Entity (Prefix (Name (N)))) | |
3493 | and then Is_Generic_Unit (Old_E) | |
3494 | then | |
3495 | Error_Msg_N | |
3496 | ("renamed generic unit must be a library unit", Name (N)); | |
3497 | ||
b9b2405f ST |
3498 | elsif Is_Package_Or_Generic_Package (Old_E) then |
3499 | ||
996ae0b0 RK |
3500 | -- Inherit categorization flags |
3501 | ||
3502 | New_E := Defining_Entity (N); | |
3503 | Set_Is_Pure (New_E, Is_Pure (Old_E)); | |
3504 | Set_Is_Preelaborated (New_E, Is_Preelaborated (Old_E)); | |
3505 | Set_Is_Remote_Call_Interface (New_E, | |
3506 | Is_Remote_Call_Interface (Old_E)); | |
3507 | Set_Is_Remote_Types (New_E, Is_Remote_Types (Old_E)); | |
3508 | Set_Is_Shared_Passive (New_E, Is_Shared_Passive (Old_E)); | |
3509 | end if; | |
3510 | end Check_Library_Unit_Renaming; | |
3511 | ||
3512 | --------------- | |
3513 | -- End_Scope -- | |
3514 | --------------- | |
3515 | ||
3516 | procedure End_Scope is | |
3517 | Id : Entity_Id; | |
3518 | Prev : Entity_Id; | |
3519 | Outer : Entity_Id; | |
3520 | ||
3521 | begin | |
3522 | Id := First_Entity (Current_Scope); | |
996ae0b0 RK |
3523 | while Present (Id) loop |
3524 | -- An entity in the current scope is not necessarily the first one | |
3525 | -- on its homonym chain. Find its predecessor if any, | |
3526 | -- If it is an internal entity, it will not be in the visibility | |
3527 | -- chain altogether, and there is nothing to unchain. | |
3528 | ||
3529 | if Id /= Current_Entity (Id) then | |
3530 | Prev := Current_Entity (Id); | |
3531 | while Present (Prev) | |
3532 | and then Present (Homonym (Prev)) | |
3533 | and then Homonym (Prev) /= Id | |
3534 | loop | |
3535 | Prev := Homonym (Prev); | |
3536 | end loop; | |
3537 | ||
3538 | -- Skip to end of loop if Id is not in the visibility chain | |
3539 | ||
3540 | if No (Prev) or else Homonym (Prev) /= Id then | |
3541 | goto Next_Ent; | |
3542 | end if; | |
3543 | ||
3544 | else | |
3545 | Prev := Empty; | |
3546 | end if; | |
3547 | ||
996ae0b0 RK |
3548 | Set_Is_Immediately_Visible (Id, False); |
3549 | ||
16ca248a | 3550 | Outer := Homonym (Id); |
996ae0b0 RK |
3551 | while Present (Outer) and then Scope (Outer) = Current_Scope loop |
3552 | Outer := Homonym (Outer); | |
3553 | end loop; | |
3554 | ||
3555 | -- Reset homonym link of other entities, but do not modify link | |
3556 | -- between entities in current scope, so that the back-end can have | |
3557 | -- a proper count of local overloadings. | |
3558 | ||
3559 | if No (Prev) then | |
3560 | Set_Name_Entity_Id (Chars (Id), Outer); | |
3561 | ||
3562 | elsif Scope (Prev) /= Scope (Id) then | |
3563 | Set_Homonym (Prev, Outer); | |
3564 | end if; | |
3565 | ||
3566 | <<Next_Ent>> | |
3567 | Next_Entity (Id); | |
3568 | end loop; | |
3569 | ||
3570 | -- If the scope generated freeze actions, place them before the | |
3571 | -- current declaration and analyze them. Type declarations and | |
3572 | -- the bodies of initialization procedures can generate such nodes. | |
3573 | -- We follow the parent chain until we reach a list node, which is | |
3574 | -- the enclosing list of declarations. If the list appears within | |
3575 | -- a protected definition, move freeze nodes outside the protected | |
3576 | -- type altogether. | |
3577 | ||
3578 | if Present | |
3579 | (Scope_Stack.Table (Scope_Stack.Last).Pending_Freeze_Actions) | |
3580 | then | |
3581 | declare | |
3582 | Decl : Node_Id; | |
3583 | L : constant List_Id := Scope_Stack.Table | |
3584 | (Scope_Stack.Last).Pending_Freeze_Actions; | |
3585 | ||
3586 | begin | |
3587 | if Is_Itype (Current_Scope) then | |
3588 | Decl := Associated_Node_For_Itype (Current_Scope); | |
3589 | else | |
3590 | Decl := Parent (Current_Scope); | |
3591 | end if; | |
3592 | ||
3593 | Pop_Scope; | |
3594 | ||
3595 | while not (Is_List_Member (Decl)) | |
294ccb21 RD |
3596 | or else Nkind_In (Parent (Decl), N_Protected_Definition, |
3597 | N_Task_Definition) | |
996ae0b0 RK |
3598 | loop |
3599 | Decl := Parent (Decl); | |
3600 | end loop; | |
3601 | ||
3602 | Insert_List_Before_And_Analyze (Decl, L); | |
3603 | end; | |
3604 | ||
3605 | else | |
3606 | Pop_Scope; | |
3607 | end if; | |
3608 | ||
3609 | end End_Scope; | |
3610 | ||
3611 | --------------------- | |
3612 | -- End_Use_Clauses -- | |
3613 | --------------------- | |
3614 | ||
3615 | procedure End_Use_Clauses (Clause : Node_Id) is | |
fbf5a39b | 3616 | U : Node_Id; |
996ae0b0 RK |
3617 | |
3618 | begin | |
fbf5a39b AC |
3619 | -- Remove Use_Type clauses first, because they affect the |
3620 | -- visibility of operators in subsequent used packages. | |
3621 | ||
3622 | U := Clause; | |
3623 | while Present (U) loop | |
3624 | if Nkind (U) = N_Use_Type_Clause then | |
3625 | End_Use_Type (U); | |
3626 | end if; | |
3627 | ||
3628 | Next_Use_Clause (U); | |
3629 | end loop; | |
3630 | ||
3631 | U := Clause; | |
996ae0b0 RK |
3632 | while Present (U) loop |
3633 | if Nkind (U) = N_Use_Package_Clause then | |
3634 | End_Use_Package (U); | |
996ae0b0 RK |
3635 | end if; |
3636 | ||
3637 | Next_Use_Clause (U); | |
3638 | end loop; | |
3639 | end End_Use_Clauses; | |
3640 | ||
3641 | --------------------- | |
3642 | -- End_Use_Package -- | |
3643 | --------------------- | |
3644 | ||
3645 | procedure End_Use_Package (N : Node_Id) is | |
3646 | Pack_Name : Node_Id; | |
3647 | Pack : Entity_Id; | |
3648 | Id : Entity_Id; | |
3649 | Elmt : Elmt_Id; | |
3650 | ||
a780db15 | 3651 | function Is_Primitive_Operator_In_Use |
2e071734 AC |
3652 | (Op : Entity_Id; |
3653 | F : Entity_Id) return Boolean; | |
fbf5a39b AC |
3654 | -- Check whether Op is a primitive operator of a use-visible type |
3655 | ||
a780db15 AC |
3656 | ---------------------------------- |
3657 | -- Is_Primitive_Operator_In_Use -- | |
3658 | ---------------------------------- | |
fbf5a39b | 3659 | |
a780db15 | 3660 | function Is_Primitive_Operator_In_Use |
2e071734 AC |
3661 | (Op : Entity_Id; |
3662 | F : Entity_Id) return Boolean | |
fbf5a39b | 3663 | is |
95eb8b69 | 3664 | T : constant Entity_Id := Base_Type (Etype (F)); |
fbf5a39b | 3665 | begin |
95eb8b69 | 3666 | return In_Use (T) and then Scope (T) = Scope (Op); |
a780db15 | 3667 | end Is_Primitive_Operator_In_Use; |
fbf5a39b AC |
3668 | |
3669 | -- Start of processing for End_Use_Package | |
3670 | ||
996ae0b0 RK |
3671 | begin |
3672 | Pack_Name := First (Names (N)); | |
996ae0b0 | 3673 | while Present (Pack_Name) loop |
996ae0b0 | 3674 | |
462c31ef ST |
3675 | -- Test that Pack_Name actually denotes a package before processing |
3676 | ||
3677 | if Is_Entity_Name (Pack_Name) | |
3678 | and then Ekind (Entity (Pack_Name)) = E_Package | |
3679 | then | |
3680 | Pack := Entity (Pack_Name); | |
3681 | ||
996ae0b0 RK |
3682 | if In_Open_Scopes (Pack) then |
3683 | null; | |
3684 | ||
3685 | elsif not Redundant_Use (Pack_Name) then | |
3686 | Set_In_Use (Pack, False); | |
d4810530 | 3687 | Set_Current_Use_Clause (Pack, Empty); |
996ae0b0 | 3688 | |
16ca248a | 3689 | Id := First_Entity (Pack); |
996ae0b0 RK |
3690 | while Present (Id) loop |
3691 | ||
fbf5a39b | 3692 | -- Preserve use-visibility of operators that are primitive |
954c111a | 3693 | -- operators of a type that is use-visible through an active |
fbf5a39b | 3694 | -- use_type clause. |
996ae0b0 RK |
3695 | |
3696 | if Nkind (Id) = N_Defining_Operator_Symbol | |
3697 | and then | |
a780db15 AC |
3698 | (Is_Primitive_Operator_In_Use |
3699 | (Id, First_Formal (Id)) | |
996ae0b0 | 3700 | or else |
fbf5a39b AC |
3701 | (Present (Next_Formal (First_Formal (Id))) |
3702 | and then | |
a780db15 | 3703 | Is_Primitive_Operator_In_Use |
fbf5a39b | 3704 | (Id, Next_Formal (First_Formal (Id))))) |
996ae0b0 RK |
3705 | then |
3706 | null; | |
3707 | ||
3708 | else | |
3709 | Set_Is_Potentially_Use_Visible (Id, False); | |
3710 | end if; | |
3711 | ||
3712 | if Is_Private_Type (Id) | |
3713 | and then Present (Full_View (Id)) | |
3714 | then | |
3715 | Set_Is_Potentially_Use_Visible (Full_View (Id), False); | |
3716 | end if; | |
3717 | ||
3718 | Next_Entity (Id); | |
3719 | end loop; | |
3720 | ||
3721 | if Present (Renamed_Object (Pack)) then | |
3722 | Set_In_Use (Renamed_Object (Pack), False); | |
d4810530 | 3723 | Set_Current_Use_Clause (Renamed_Object (Pack), Empty); |
996ae0b0 RK |
3724 | end if; |
3725 | ||
3726 | if Chars (Pack) = Name_System | |
3727 | and then Scope (Pack) = Standard_Standard | |
3728 | and then Present_System_Aux | |
3729 | then | |
3730 | Id := First_Entity (System_Aux_Id); | |
996ae0b0 RK |
3731 | while Present (Id) loop |
3732 | Set_Is_Potentially_Use_Visible (Id, False); | |
3733 | ||
3734 | if Is_Private_Type (Id) | |
3735 | and then Present (Full_View (Id)) | |
3736 | then | |
3737 | Set_Is_Potentially_Use_Visible (Full_View (Id), False); | |
3738 | end if; | |
3739 | ||
3740 | Next_Entity (Id); | |
3741 | end loop; | |
3742 | ||
3743 | Set_In_Use (System_Aux_Id, False); | |
3744 | end if; | |
3745 | ||
3746 | else | |
3747 | Set_Redundant_Use (Pack_Name, False); | |
3748 | end if; | |
996ae0b0 RK |
3749 | end if; |
3750 | ||
3751 | Next (Pack_Name); | |
3752 | end loop; | |
3753 | ||
3754 | if Present (Hidden_By_Use_Clause (N)) then | |
3755 | Elmt := First_Elmt (Hidden_By_Use_Clause (N)); | |
996ae0b0 | 3756 | while Present (Elmt) loop |
e69614ad AC |
3757 | declare |
3758 | E : constant Entity_Id := Node (Elmt); | |
3759 | ||
3760 | begin | |
3761 | -- Reset either Use_Visibility or Direct_Visibility, depending | |
3762 | -- on how the entity was hidden by the use clause. | |
3763 | ||
3764 | if In_Use (Scope (E)) | |
3765 | and then Used_As_Generic_Actual (Scope (E)) | |
3766 | then | |
3767 | Set_Is_Potentially_Use_Visible (Node (Elmt)); | |
3768 | else | |
3769 | Set_Is_Immediately_Visible (Node (Elmt)); | |
3770 | end if; | |
3771 | ||
3772 | Next_Elmt (Elmt); | |
3773 | end; | |
996ae0b0 RK |
3774 | end loop; |
3775 | ||
3776 | Set_Hidden_By_Use_Clause (N, No_Elist); | |
3777 | end if; | |
3778 | end End_Use_Package; | |
3779 | ||
3780 | ------------------ | |
3781 | -- End_Use_Type -- | |
3782 | ------------------ | |
3783 | ||
3784 | procedure End_Use_Type (N : Node_Id) is | |
4a214958 | 3785 | Elmt : Elmt_Id; |
996ae0b0 | 3786 | Id : Entity_Id; |
996ae0b0 RK |
3787 | T : Entity_Id; |
3788 | ||
4a214958 AC |
3789 | -- Start of processing for End_Use_Type |
3790 | ||
996ae0b0 RK |
3791 | begin |
3792 | Id := First (Subtype_Marks (N)); | |
996ae0b0 | 3793 | while Present (Id) loop |
fbf5a39b | 3794 | |
4a214958 | 3795 | -- A call to Rtsfind may occur while analyzing a use_type clause, |
fbf5a39b AC |
3796 | -- in which case the type marks are not resolved yet, and there is |
3797 | -- nothing to remove. | |
3798 | ||
4a214958 | 3799 | if not Is_Entity_Name (Id) or else No (Entity (Id)) then |
fbf5a39b AC |
3800 | goto Continue; |
3801 | end if; | |
3802 | ||
996ae0b0 RK |
3803 | T := Entity (Id); |
3804 | ||
4a214958 | 3805 | if T = Any_Type or else From_With_Type (T) then |
996ae0b0 RK |
3806 | null; |
3807 | ||
4a214958 | 3808 | -- Note that the use_type clause may mention a subtype of the type |
16ca248a ES |
3809 | -- whose primitive operations have been made visible. Here as |
3810 | -- elsewhere, it is the base type that matters for visibility. | |
996ae0b0 RK |
3811 | |
3812 | elsif In_Open_Scopes (Scope (Base_Type (T))) then | |
3813 | null; | |
3814 | ||
3815 | elsif not Redundant_Use (Id) then | |
3816 | Set_In_Use (T, False); | |
3817 | Set_In_Use (Base_Type (T), False); | |
21d27997 RD |
3818 | Set_Current_Use_Clause (T, Empty); |
3819 | Set_Current_Use_Clause (Base_Type (T), Empty); | |
996ae0b0 RK |
3820 | end if; |
3821 | ||
fbf5a39b | 3822 | <<Continue>> |
29efbb8c | 3823 | Next (Id); |
996ae0b0 | 3824 | end loop; |
29efbb8c ES |
3825 | |
3826 | if Is_Empty_Elmt_List (Used_Operations (N)) then | |
3827 | return; | |
3828 | ||
3829 | else | |
3830 | Elmt := First_Elmt (Used_Operations (N)); | |
3831 | while Present (Elmt) loop | |
3832 | Set_Is_Potentially_Use_Visible (Node (Elmt), False); | |
3833 | Next_Elmt (Elmt); | |
3834 | end loop; | |
3835 | end if; | |
996ae0b0 RK |
3836 | end End_Use_Type; |
3837 | ||
3838 | ---------------------- | |
3839 | -- Find_Direct_Name -- | |
3840 | ---------------------- | |
3841 | ||
3842 | procedure Find_Direct_Name (N : Node_Id) is | |
3843 | E : Entity_Id; | |
3844 | E2 : Entity_Id; | |
3845 | Msg : Boolean; | |
3846 | ||
3847 | Inst : Entity_Id := Empty; | |
bc41faa2 | 3848 | -- Enclosing instance, if any |
996ae0b0 RK |
3849 | |
3850 | Homonyms : Entity_Id; | |
3851 | -- Saves start of homonym chain | |
3852 | ||
3853 | Nvis_Entity : Boolean; | |
3764bb00 BD |
3854 | -- Set True to indicate that there is at least one entity on the homonym |
3855 | -- chain which, while not visible, is visible enough from the user point | |
3856 | -- of view to warrant an error message of "not visible" rather than | |
3857 | -- undefined. | |
996ae0b0 | 3858 | |
9bc856dd | 3859 | Nvis_Is_Private_Subprg : Boolean := False; |
0ab80019 | 3860 | -- Ada 2005 (AI-262): Set True to indicate that a form of Beaujolais |
9bc856dd AC |
3861 | -- effect concerning library subprograms has been detected. Used to |
3862 | -- generate the precise error message. | |
3863 | ||
996ae0b0 RK |
3864 | function From_Actual_Package (E : Entity_Id) return Boolean; |
3865 | -- Returns true if the entity is declared in a package that is | |
3866 | -- an actual for a formal package of the current instance. Such an | |
3867 | -- entity requires special handling because it may be use-visible | |
3868 | -- but hides directly visible entities defined outside the instance. | |
3869 | ||
67ce0d7e RD |
3870 | function Is_Actual_Parameter return Boolean; |
3871 | -- This function checks if the node N is an identifier that is an actual | |
3872 | -- parameter of a procedure call. If so it returns True, otherwise it | |
3873 | -- return False. The reason for this check is that at this stage we do | |
3874 | -- not know what procedure is being called if the procedure might be | |
3875 | -- overloaded, so it is premature to go setting referenced flags or | |
3876 | -- making calls to Generate_Reference. We will wait till Resolve_Actuals | |
3877 | -- for that processing | |
3878 | ||
996ae0b0 RK |
3879 | function Known_But_Invisible (E : Entity_Id) return Boolean; |
3880 | -- This function determines whether the entity E (which is not | |
3881 | -- visible) can reasonably be considered to be known to the writer | |
3882 | -- of the reference. This is a heuristic test, used only for the | |
3883 | -- purposes of figuring out whether we prefer to complain that an | |
3884 | -- entity is undefined or invisible (and identify the declaration | |
3885 | -- of the invisible entity in the latter case). The point here is | |
3886 | -- that we don't want to complain that something is invisible and | |
3887 | -- then point to something entirely mysterious to the writer. | |
3888 | ||
3889 | procedure Nvis_Messages; | |
3890 | -- Called if there are no visible entries for N, but there is at least | |
3891 | -- one non-directly visible, or hidden declaration. This procedure | |
3892 | -- outputs an appropriate set of error messages. | |
3893 | ||
3894 | procedure Undefined (Nvis : Boolean); | |
3895 | -- This function is called if the current node has no corresponding | |
3896 | -- visible entity or entities. The value set in Msg indicates whether | |
3897 | -- an error message was generated (multiple error messages for the | |
3898 | -- same variable are generally suppressed, see body for details). | |
3899 | -- Msg is True if an error message was generated, False if not. This | |
3900 | -- value is used by the caller to determine whether or not to output | |
3901 | -- additional messages where appropriate. The parameter is set False | |
3902 | -- to get the message "X is undefined", and True to get the message | |
3903 | -- "X is not visible". | |
3904 | ||
3905 | ------------------------- | |
3906 | -- From_Actual_Package -- | |
3907 | ------------------------- | |
3908 | ||
3909 | function From_Actual_Package (E : Entity_Id) return Boolean is | |
3910 | Scop : constant Entity_Id := Scope (E); | |
3911 | Act : Entity_Id; | |
3912 | ||
3913 | begin | |
3914 | if not In_Instance then | |
3915 | return False; | |
3916 | else | |
3917 | Inst := Current_Scope; | |
996ae0b0 RK |
3918 | while Present (Inst) |
3919 | and then Ekind (Inst) /= E_Package | |
3920 | and then not Is_Generic_Instance (Inst) | |
3921 | loop | |
3922 | Inst := Scope (Inst); | |
3923 | end loop; | |
3924 | ||
3925 | if No (Inst) then | |
3926 | return False; | |
3927 | end if; | |
3928 | ||
3929 | Act := First_Entity (Inst); | |
996ae0b0 RK |
3930 | while Present (Act) loop |
3931 | if Ekind (Act) = E_Package then | |
3932 | ||
3933 | -- Check for end of actuals list | |
3934 | ||
3935 | if Renamed_Object (Act) = Inst then | |
3936 | return False; | |
3937 | ||
3938 | elsif Present (Associated_Formal_Package (Act)) | |
3939 | and then Renamed_Object (Act) = Scop | |
3940 | then | |
3941 | -- Entity comes from (instance of) formal package | |
3942 | ||
3943 | return True; | |
3944 | ||
3945 | else | |
3946 | Next_Entity (Act); | |
3947 | end if; | |
3948 | ||
3949 | else | |
3950 | Next_Entity (Act); | |
3951 | end if; | |
3952 | end loop; | |
3953 | ||
3954 | return False; | |
3955 | end if; | |
3956 | end From_Actual_Package; | |
3957 | ||
67ce0d7e RD |
3958 | ------------------------- |
3959 | -- Is_Actual_Parameter -- | |
3960 | ------------------------- | |
3961 | ||
3962 | function Is_Actual_Parameter return Boolean is | |
3963 | begin | |
3964 | return | |
3965 | Nkind (N) = N_Identifier | |
3966 | and then | |
3967 | (Nkind (Parent (N)) = N_Procedure_Call_Statement | |
3968 | or else | |
3969 | (Nkind (Parent (N)) = N_Parameter_Association | |
3970 | and then N = Explicit_Actual_Parameter (Parent (N)) | |
3971 | and then Nkind (Parent (Parent (N))) = | |
3972 | N_Procedure_Call_Statement)); | |
3973 | end Is_Actual_Parameter; | |
3974 | ||
996ae0b0 RK |
3975 | ------------------------- |
3976 | -- Known_But_Invisible -- | |
3977 | ------------------------- | |
3978 | ||
3979 | function Known_But_Invisible (E : Entity_Id) return Boolean is | |
3980 | Fname : File_Name_Type; | |
3981 | ||
3982 | begin | |
3983 | -- Entities in Standard are always considered to be known | |
3984 | ||
3985 | if Sloc (E) <= Standard_Location then | |
3986 | return True; | |
3987 | ||
3988 | -- An entity that does not come from source is always considered | |
3989 | -- to be unknown, since it is an artifact of code expansion. | |
3990 | ||
3991 | elsif not Comes_From_Source (E) then | |
3992 | return False; | |
3993 | ||
3994 | -- In gnat internal mode, we consider all entities known | |
3995 | ||
3996 | elsif GNAT_Mode then | |
3997 | return True; | |
3998 | end if; | |
3999 | ||
4000 | -- Here we have an entity that is not from package Standard, and | |
4001 | -- which comes from Source. See if it comes from an internal file. | |
4002 | ||
4003 | Fname := Unit_File_Name (Get_Source_Unit (E)); | |
4004 | ||
4005 | -- Case of from internal file | |
4006 | ||
4007 | if Is_Internal_File_Name (Fname) then | |
4008 | ||
4009 | -- Private part entities in internal files are never considered | |
4010 | -- to be known to the writer of normal application code. | |
4011 | ||
4012 | if Is_Hidden (E) then | |
4013 | return False; | |
4014 | end if; | |
4015 | ||
4016 | -- Entities from System packages other than System and | |
4017 | -- System.Storage_Elements are not considered to be known. | |
4018 | -- System.Auxxxx files are also considered known to the user. | |
4019 | ||
4020 | -- Should refine this at some point to generally distinguish | |
4021 | -- between known and unknown internal files ??? | |
4022 | ||
4023 | Get_Name_String (Fname); | |
4024 | ||
4025 | return | |
4026 | Name_Len < 2 | |
4027 | or else | |
4028 | Name_Buffer (1 .. 2) /= "s-" | |
4029 | or else | |
4030 | Name_Buffer (3 .. 8) = "stoele" | |
4031 | or else | |
4032 | Name_Buffer (3 .. 5) = "aux"; | |
4033 | ||
4034 | -- If not an internal file, then entity is definitely known, | |
4035 | -- even if it is in a private part (the message generated will | |
4036 | -- note that it is in a private part) | |
4037 | ||
4038 | else | |
4039 | return True; | |
4040 | end if; | |
4041 | end Known_But_Invisible; | |
4042 | ||
4043 | ------------------- | |
4044 | -- Nvis_Messages -- | |
4045 | ------------------- | |
4046 | ||
4047 | procedure Nvis_Messages is | |
9bc856dd AC |
4048 | Comp_Unit : Node_Id; |
4049 | Ent : Entity_Id; | |
1175f0b6 | 4050 | Found : Boolean := False; |
9bc856dd AC |
4051 | Hidden : Boolean := False; |
4052 | Item : Node_Id; | |
996ae0b0 RK |
4053 | |
4054 | begin | |
0ab80019 | 4055 | -- Ada 2005 (AI-262): Generate a precise error concerning the |
9bc856dd AC |
4056 | -- Beaujolais effect that was previously detected |
4057 | ||
4058 | if Nvis_Is_Private_Subprg then | |
4059 | ||
4060 | pragma Assert (Nkind (E2) = N_Defining_Identifier | |
16ca248a ES |
4061 | and then Ekind (E2) = E_Function |
4062 | and then Scope (E2) = Standard_Standard | |
4063 | and then Has_Private_With (E2)); | |
9bc856dd AC |
4064 | |
4065 | -- Find the sloc corresponding to the private with'ed unit | |
4066 | ||
16ca248a | 4067 | Comp_Unit := Cunit (Current_Sem_Unit); |
9bc856dd AC |
4068 | Error_Msg_Sloc := No_Location; |
4069 | ||
16ca248a | 4070 | Item := First (Context_Items (Comp_Unit)); |
9bc856dd AC |
4071 | while Present (Item) loop |
4072 | if Nkind (Item) = N_With_Clause | |
4073 | and then Private_Present (Item) | |
4074 | and then Entity (Name (Item)) = E2 | |
4075 | then | |
4076 | Error_Msg_Sloc := Sloc (Item); | |
4077 | exit; | |
4078 | end if; | |
4079 | ||
4080 | Next (Item); | |
4081 | end loop; | |
4082 | ||
4083 | pragma Assert (Error_Msg_Sloc /= No_Location); | |
4084 | ||
0ab80019 | 4085 | Error_Msg_N ("(Ada 2005): hidden by private with clause #", N); |
9bc856dd AC |
4086 | return; |
4087 | end if; | |
4088 | ||
996ae0b0 RK |
4089 | Undefined (Nvis => True); |
4090 | ||
4091 | if Msg then | |
4092 | ||
4093 | -- First loop does hidden declarations | |
4094 | ||
4095 | Ent := Homonyms; | |
4096 | while Present (Ent) loop | |
4097 | if Is_Potentially_Use_Visible (Ent) then | |
996ae0b0 | 4098 | if not Hidden then |
deef4289 AC |
4099 | Error_Msg_N -- CODEFIX |
4100 | ("multiple use clauses cause hiding!", N); | |
996ae0b0 RK |
4101 | Hidden := True; |
4102 | end if; | |
4103 | ||
4104 | Error_Msg_Sloc := Sloc (Ent); | |
4e7a4f6e AC |
4105 | Error_Msg_N -- CODEFIX |
4106 | ("hidden declaration#!", N); | |
996ae0b0 RK |
4107 | end if; |
4108 | ||
4109 | Ent := Homonym (Ent); | |
4110 | end loop; | |
4111 | ||
4112 | -- If we found hidden declarations, then that's enough, don't | |
4113 | -- bother looking for non-visible declarations as well. | |
4114 | ||
4115 | if Hidden then | |
4116 | return; | |
4117 | end if; | |
4118 | ||
4119 | -- Second loop does non-directly visible declarations | |
4120 | ||
4121 | Ent := Homonyms; | |
4122 | while Present (Ent) loop | |
4123 | if not Is_Potentially_Use_Visible (Ent) then | |
4124 | ||
4125 | -- Do not bother the user with unknown entities | |
4126 | ||
4127 | if not Known_But_Invisible (Ent) then | |
4128 | goto Continue; | |
4129 | end if; | |
4130 | ||
4131 | Error_Msg_Sloc := Sloc (Ent); | |
4132 | ||
4133 | -- Output message noting that there is a non-visible | |
4134 | -- declaration, distinguishing the private part case. | |
4135 | ||
4136 | if Is_Hidden (Ent) then | |
4137 | Error_Msg_N ("non-visible (private) declaration#!", N); | |
1175f0b6 AC |
4138 | |
4139 | -- If the entity is declared in a generic package, it | |
4140 | -- cannot be visible, so there is no point in adding it | |
4141 | -- to the list of candidates if another homograph from a | |
4142 | -- non-generic package has been seen. | |
4143 | ||
4144 | elsif Ekind (Scope (Ent)) = E_Generic_Package | |
4145 | and then Found | |
4146 | then | |
4147 | null; | |
4148 | ||
996ae0b0 | 4149 | else |
483c78cb RD |
4150 | Error_Msg_N -- CODEFIX |
4151 | ("non-visible declaration#!", N); | |
fbf5a39b | 4152 | |
1175f0b6 AC |
4153 | if Ekind (Scope (Ent)) /= E_Generic_Package then |
4154 | Found := True; | |
4155 | end if; | |
4156 | ||
fbf5a39b AC |
4157 | if Is_Compilation_Unit (Ent) |
4158 | and then | |
4159 | Nkind (Parent (Parent (N))) = N_Use_Package_Clause | |
4160 | then | |
16ca248a | 4161 | Error_Msg_Qual_Level := 99; |
ed2233dc AC |
4162 | Error_Msg_NE -- CODEFIX |
4163 | ("\\missing `WITH &;`", N, Ent); | |
16ca248a | 4164 | Error_Msg_Qual_Level := 0; |
fbf5a39b | 4165 | end if; |
e1b871e9 AC |
4166 | |
4167 | if Ekind (Ent) = E_Discriminant | |
4168 | and then Present (Corresponding_Discriminant (Ent)) | |
4169 | and then Scope (Corresponding_Discriminant (Ent)) = | |
4170 | Etype (Scope (Ent)) | |
4171 | then | |
4172 | Error_Msg_N | |
4173 | ("inherited discriminant not allowed here" & | |
4174 | " (RM 3.8 (12), 3.8.1 (6))!", N); | |
4175 | end if; | |
996ae0b0 | 4176 | end if; |
07fc65c4 GB |
4177 | |
4178 | -- Set entity and its containing package as referenced. We | |
4179 | -- can't be sure of this, but this seems a better choice | |
4180 | -- to avoid unused entity messages. | |
4181 | ||
4182 | if Comes_From_Source (Ent) then | |
4183 | Set_Referenced (Ent); | |
4184 | Set_Referenced (Cunit_Entity (Get_Source_Unit (Ent))); | |
4185 | end if; | |
996ae0b0 RK |
4186 | end if; |
4187 | ||
4188 | <<Continue>> | |
4189 | Ent := Homonym (Ent); | |
4190 | end loop; | |
996ae0b0 RK |
4191 | end if; |
4192 | end Nvis_Messages; | |
4193 | ||
4194 | --------------- | |
4195 | -- Undefined -- | |
4196 | --------------- | |
4197 | ||
4198 | procedure Undefined (Nvis : Boolean) is | |
4199 | Emsg : Error_Msg_Id; | |
4200 | ||
4201 | begin | |
fbf5a39b AC |
4202 | -- We should never find an undefined internal name. If we do, then |
4203 | -- see if we have previous errors. If so, ignore on the grounds that | |
4204 | -- it is probably a cascaded message (e.g. a block label from a badly | |
4205 | -- formed block). If no previous errors, then we have a real internal | |
4206 | -- error of some kind so raise an exception. | |
4207 | ||
4208 | if Is_Internal_Name (Chars (N)) then | |
4209 | if Total_Errors_Detected /= 0 then | |
4210 | return; | |
4211 | else | |
4212 | raise Program_Error; | |
4213 | end if; | |
4214 | end if; | |
4215 | ||
996ae0b0 RK |
4216 | -- A very specialized error check, if the undefined variable is |
4217 | -- a case tag, and the case type is an enumeration type, check | |
4218 | -- for a possible misspelling, and if so, modify the identifier | |
4219 | ||
4220 | -- Named aggregate should also be handled similarly ??? | |
4221 | ||
4222 | if Nkind (N) = N_Identifier | |
4223 | and then Nkind (Parent (N)) = N_Case_Statement_Alternative | |
4224 | then | |
996ae0b0 | 4225 | declare |
996ae0b0 RK |
4226 | Case_Stm : constant Node_Id := Parent (Parent (N)); |
4227 | Case_Typ : constant Entity_Id := Etype (Expression (Case_Stm)); | |
4228 | ||
4229 | Lit : Node_Id; | |
4230 | ||
4231 | begin | |
4232 | if Is_Enumeration_Type (Case_Typ) | |
21d27997 | 4233 | and then not Is_Standard_Character_Type (Case_Typ) |
996ae0b0 RK |
4234 | then |
4235 | Lit := First_Literal (Case_Typ); | |
4236 | Get_Name_String (Chars (Lit)); | |
4237 | ||
4238 | if Chars (Lit) /= Chars (N) | |
294ccb21 | 4239 | and then Is_Bad_Spelling_Of (Chars (N), Chars (Lit)) then |
996ae0b0 | 4240 | Error_Msg_Node_2 := Lit; |
ed2233dc | 4241 | Error_Msg_N -- CODEFIX |
996ae0b0 RK |
4242 | ("& is undefined, assume misspelling of &", N); |
4243 | Rewrite (N, New_Occurrence_Of (Lit, Sloc (N))); | |
4244 | return; | |
4245 | end if; | |
4246 | ||
4247 | Lit := Next_Literal (Lit); | |
4248 | end if; | |
4249 | end; | |
4250 | end if; | |
4251 | ||
4252 | -- Normal processing | |
4253 | ||
4254 | Set_Entity (N, Any_Id); | |
4255 | Set_Etype (N, Any_Type); | |
4256 | ||
4257 | -- We use the table Urefs to keep track of entities for which we | |
4258 | -- have issued errors for undefined references. Multiple errors | |
4259 | -- for a single name are normally suppressed, however we modify | |
4260 | -- the error message to alert the programmer to this effect. | |
4261 | ||
4262 | for J in Urefs.First .. Urefs.Last loop | |
4263 | if Chars (N) = Chars (Urefs.Table (J).Node) then | |
4264 | if Urefs.Table (J).Err /= No_Error_Msg | |
4265 | and then Sloc (N) /= Urefs.Table (J).Loc | |
4266 | then | |
4267 | Error_Msg_Node_1 := Urefs.Table (J).Node; | |
4268 | ||
4269 | if Urefs.Table (J).Nvis then | |
4270 | Change_Error_Text (Urefs.Table (J).Err, | |
4271 | "& is not visible (more references follow)"); | |
4272 | else | |
4273 | Change_Error_Text (Urefs.Table (J).Err, | |
4274 | "& is undefined (more references follow)"); | |
4275 | end if; | |
4276 | ||
4277 | Urefs.Table (J).Err := No_Error_Msg; | |
4278 | end if; | |
4279 | ||
4280 | -- Although we will set Msg False, and thus suppress the | |
4281 | -- message, we also set Error_Posted True, to avoid any | |
4282 | -- cascaded messages resulting from the undefined reference. | |
4283 | ||
4284 | Msg := False; | |
4285 | Set_Error_Posted (N, True); | |
4286 | return; | |
4287 | end if; | |
4288 | end loop; | |
4289 | ||
4290 | -- If entry not found, this is first undefined occurrence | |
4291 | ||
4292 | if Nvis then | |
4293 | Error_Msg_N ("& is not visible!", N); | |
4294 | Emsg := Get_Msg_Id; | |
4295 | ||
4296 | else | |
4297 | Error_Msg_N ("& is undefined!", N); | |
4298 | Emsg := Get_Msg_Id; | |
4299 | ||
4300 | -- A very bizarre special check, if the undefined identifier | |
4301 | -- is put or put_line, then add a special error message (since | |
4302 | -- this is a very common error for beginners to make). | |
4303 | ||
4304 | if Chars (N) = Name_Put or else Chars (N) = Name_Put_Line then | |
ed2233dc | 4305 | Error_Msg_N -- CODEFIX |
16ca248a ES |
4306 | ("\\possible missing `WITH Ada.Text_'I'O; " & |
4307 | "USE Ada.Text_'I'O`!", N); | |
4308 | ||
4309 | -- Another special check if N is the prefix of a selected | |
4310 | -- component which is a known unit, add message complaining | |
fbe627af | 4311 | -- about missing with for this unit. |
16ca248a ES |
4312 | |
4313 | elsif Nkind (Parent (N)) = N_Selected_Component | |
4314 | and then N = Prefix (Parent (N)) | |
4315 | and then Is_Known_Unit (Parent (N)) | |
4316 | then | |
4317 | Error_Msg_Node_2 := Selector_Name (Parent (N)); | |
ed2233dc AC |
4318 | Error_Msg_N -- CODEFIX |
4319 | ("\\missing `WITH &.&;`", Prefix (Parent (N))); | |
996ae0b0 RK |
4320 | end if; |
4321 | ||
4322 | -- Now check for possible misspellings | |
4323 | ||
996ae0b0 RK |
4324 | declare |
4325 | E : Entity_Id; | |
4326 | Ematch : Entity_Id := Empty; | |
4327 | ||
4328 | Last_Name_Id : constant Name_Id := | |
4329 | Name_Id (Nat (First_Name_Id) + | |
4330 | Name_Entries_Count - 1); | |
4331 | ||
996ae0b0 | 4332 | begin |
294ccb21 RD |
4333 | for Nam in First_Name_Id .. Last_Name_Id loop |
4334 | E := Get_Name_Entity_Id (Nam); | |
996ae0b0 RK |
4335 | |
4336 | if Present (E) | |
4337 | and then (Is_Immediately_Visible (E) | |
4338 | or else | |
4339 | Is_Potentially_Use_Visible (E)) | |
4340 | then | |
294ccb21 | 4341 | if Is_Bad_Spelling_Of (Chars (N), Nam) then |
996ae0b0 RK |
4342 | Ematch := E; |
4343 | exit; | |
4344 | end if; | |
4345 | end if; | |
4346 | end loop; | |
4347 | ||
4348 | if Present (Ematch) then | |
deef4289 AC |
4349 | Error_Msg_NE -- CODEFIX |
4350 | ("\possible misspelling of&", N, Ematch); | |
996ae0b0 RK |
4351 | end if; |
4352 | end; | |
4353 | end if; | |
4354 | ||
16ca248a ES |
4355 | -- Make entry in undefined references table unless the full errors |
4356 | -- switch is set, in which case by refraining from generating the | |
4357 | -- table entry, we guarantee that we get an error message for every | |
4358 | -- undefined reference. | |
996ae0b0 RK |
4359 | |
4360 | if not All_Errors_Mode then | |
11560bcc TQ |
4361 | Urefs.Append ( |
4362 | (Node => N, | |
4363 | Err => Emsg, | |
4364 | Nvis => Nvis, | |
4365 | Loc => Sloc (N))); | |
996ae0b0 RK |
4366 | end if; |
4367 | ||
4368 | Msg := True; | |
4369 | end Undefined; | |
4370 | ||
4371 | -- Start of processing for Find_Direct_Name | |
4372 | ||
4373 | begin | |
4374 | -- If the entity pointer is already set, this is an internal node, or | |
4375 | -- a node that is analyzed more than once, after a tree modification. | |
4376 | -- In such a case there is no resolution to perform, just set the type. | |
4377 | ||
4378 | if Present (Entity (N)) then | |
4379 | if Is_Type (Entity (N)) then | |
4380 | Set_Etype (N, Entity (N)); | |
4381 | ||
4382 | else | |
4383 | declare | |
4384 | Entyp : constant Entity_Id := Etype (Entity (N)); | |
4385 | ||
4386 | begin | |
4387 | -- One special case here. If the Etype field is already set, | |
4388 | -- and references the packed array type corresponding to the | |
4389 | -- etype of the referenced entity, then leave it alone. This | |
4390 | -- happens for trees generated from Exp_Pakd, where expressions | |
4391 | -- can be deliberately "mis-typed" to the packed array type. | |
4392 | ||
4393 | if Is_Array_Type (Entyp) | |
4394 | and then Is_Packed (Entyp) | |
4395 | and then Present (Etype (N)) | |
4396 | and then Etype (N) = Packed_Array_Type (Entyp) | |
4397 | then | |
4398 | null; | |
4399 | ||
4400 | -- If not that special case, then just reset the Etype | |
4401 | ||
4402 | else | |
4403 | Set_Etype (N, Etype (Entity (N))); | |
4404 | end if; | |
4405 | end; | |
4406 | end if; | |
4407 | ||
4408 | return; | |
4409 | end if; | |
4410 | ||
4411 | -- Here if Entity pointer was not set, we need full visibility analysis | |
4412 | -- First we generate debugging output if the debug E flag is set. | |
4413 | ||
4414 | if Debug_Flag_E then | |
4415 | Write_Str ("Looking for "); | |
4416 | Write_Name (Chars (N)); | |
4417 | Write_Eol; | |
4418 | end if; | |
4419 | ||
4420 | Homonyms := Current_Entity (N); | |
4421 | Nvis_Entity := False; | |
4422 | ||
4423 | E := Homonyms; | |
4424 | while Present (E) loop | |
4425 | ||
ff81221b ES |
4426 | -- If entity is immediately visible or potentially use visible, then |
4427 | -- process the entity and we are done. | |
996ae0b0 RK |
4428 | |
4429 | if Is_Immediately_Visible (E) then | |
4430 | goto Immediately_Visible_Entity; | |
4431 | ||
4432 | elsif Is_Potentially_Use_Visible (E) then | |
4433 | goto Potentially_Use_Visible_Entity; | |
4434 | ||
4435 | -- Note if a known but invisible entity encountered | |
4436 | ||
4437 | elsif Known_But_Invisible (E) then | |
4438 | Nvis_Entity := True; | |
4439 | end if; | |
4440 | ||
4441 | -- Move to next entity in chain and continue search | |
4442 | ||
4443 | E := Homonym (E); | |
4444 | end loop; | |
4445 | ||
4446 | -- If no entries on homonym chain that were potentially visible, | |
4447 | -- and no entities reasonably considered as non-visible, then | |
4448 | -- we have a plain undefined reference, with no additional | |
4449 | -- explanation required! | |
4450 | ||
4451 | if not Nvis_Entity then | |
4452 | Undefined (Nvis => False); | |
996ae0b0 RK |
4453 | |
4454 | -- Otherwise there is at least one entry on the homonym chain that | |
4455 | -- is reasonably considered as being known and non-visible. | |
4456 | ||
4457 | else | |
4458 | Nvis_Messages; | |
996ae0b0 RK |
4459 | end if; |
4460 | ||
fbf5a39b AC |
4461 | return; |
4462 | ||
996ae0b0 RK |
4463 | -- Processing for a potentially use visible entry found. We must search |
4464 | -- the rest of the homonym chain for two reasons. First, if there is a | |
4465 | -- directly visible entry, then none of the potentially use-visible | |
4466 | -- entities are directly visible (RM 8.4(10)). Second, we need to check | |
4467 | -- for the case of multiple potentially use-visible entries hiding one | |
4468 | -- another and as a result being non-directly visible (RM 8.4(11)). | |
4469 | ||
4470 | <<Potentially_Use_Visible_Entity>> declare | |
4471 | Only_One_Visible : Boolean := True; | |
4472 | All_Overloadable : Boolean := Is_Overloadable (E); | |
4473 | ||
4474 | begin | |
4475 | E2 := Homonym (E); | |
996ae0b0 RK |
4476 | while Present (E2) loop |
4477 | if Is_Immediately_Visible (E2) then | |
4478 | ||
4479 | -- If the use-visible entity comes from the actual for a | |
4480 | -- formal package, it hides a directly visible entity from | |
4481 | -- outside the instance. | |
4482 | ||
4483 | if From_Actual_Package (E) | |
4484 | and then Scope_Depth (E2) < Scope_Depth (Inst) | |
4485 | then | |
4486 | goto Found; | |
4487 | else | |
4488 | E := E2; | |
4489 | goto Immediately_Visible_Entity; | |
4490 | end if; | |
4491 | ||
4492 | elsif Is_Potentially_Use_Visible (E2) then | |
4493 | Only_One_Visible := False; | |
4494 | All_Overloadable := All_Overloadable and Is_Overloadable (E2); | |
9bc856dd | 4495 | |
30783513 | 4496 | -- Ada 2005 (AI-262): Protect against a form of Beaujolais effect |
f3d57416 | 4497 | -- that can occur in private_with clauses. Example: |
9bc856dd AC |
4498 | |
4499 | -- with A; | |
4500 | -- private with B; package A is | |
4501 | -- package C is function B return Integer; | |
4502 | -- use A; end A; | |
4503 | -- V1 : Integer := B; | |
4504 | -- private function B return Integer; | |
4505 | -- V2 : Integer := B; | |
4506 | -- end C; | |
4507 | ||
bc41faa2 | 4508 | -- V1 resolves to A.B, but V2 resolves to library unit B |
9bc856dd AC |
4509 | |
4510 | elsif Ekind (E2) = E_Function | |
4511 | and then Scope (E2) = Standard_Standard | |
4512 | and then Has_Private_With (E2) | |
4513 | then | |
4514 | Only_One_Visible := False; | |
4515 | All_Overloadable := False; | |
4516 | Nvis_Is_Private_Subprg := True; | |
4517 | exit; | |
996ae0b0 RK |
4518 | end if; |
4519 | ||
4520 | E2 := Homonym (E2); | |
4521 | end loop; | |
4522 | ||
4523 | -- On falling through this loop, we have checked that there are no | |
4524 | -- immediately visible entities. Only_One_Visible is set if exactly | |
4525 | -- one potentially use visible entity exists. All_Overloadable is | |
4526 | -- set if all the potentially use visible entities are overloadable. | |
4527 | -- The condition for legality is that either there is one potentially | |
4528 | -- use visible entity, or if there is more than one, then all of them | |
4529 | -- are overloadable. | |
4530 | ||
4531 | if Only_One_Visible or All_Overloadable then | |
4532 | goto Found; | |
4533 | ||
4534 | -- If there is more than one potentially use-visible entity and at | |
4535 | -- least one of them non-overloadable, we have an error (RM 8.4(11). | |
4536 | -- Note that E points to the first such entity on the homonym list. | |
4537 | -- Special case: if one of the entities is declared in an actual | |
4538 | -- package, it was visible in the generic, and takes precedence over | |
fbf5a39b AC |
4539 | -- other entities that are potentially use-visible. Same if it is |
4540 | -- declared in a local instantiation of the current instance. | |
996ae0b0 RK |
4541 | |
4542 | else | |
4543 | if In_Instance then | |
fbf5a39b | 4544 | |
bc41faa2 | 4545 | -- Find current instance |
fbf5a39b | 4546 | |
16ca248a | 4547 | Inst := Current_Scope; |
fbf5a39b AC |
4548 | while Present (Inst) |
4549 | and then Inst /= Standard_Standard | |
4550 | loop | |
4551 | if Is_Generic_Instance (Inst) then | |
4552 | exit; | |
4553 | end if; | |
4554 | ||
4555 | Inst := Scope (Inst); | |
4556 | end loop; | |
4557 | ||
996ae0b0 | 4558 | E2 := E; |
996ae0b0 | 4559 | while Present (E2) loop |
fbf5a39b AC |
4560 | if From_Actual_Package (E2) |
4561 | or else | |
4562 | (Is_Generic_Instance (Scope (E2)) | |
4563 | and then Scope_Depth (Scope (E2)) > Scope_Depth (Inst)) | |
4564 | then | |
996ae0b0 RK |
4565 | E := E2; |
4566 | goto Found; | |
4567 | end if; | |
4568 | ||
4569 | E2 := Homonym (E2); | |
4570 | end loop; | |
4571 | ||
4572 | Nvis_Messages; | |
4573 | return; | |
4574 | ||
5eb10f25 ES |
4575 | elsif |
4576 | Is_Predefined_File_Name (Unit_File_Name (Current_Sem_Unit)) | |
4577 | then | |
4de287c4 ES |
4578 | -- A use-clause in the body of a system file creates conflict |
4579 | -- with some entity in a user scope, while rtsfind is active. | |
4580 | -- Keep only the entity coming from another predefined unit. | |
5eb10f25 ES |
4581 | |
4582 | E2 := E; | |
4583 | while Present (E2) loop | |
4584 | if Is_Predefined_File_Name | |
4585 | (Unit_File_Name (Get_Source_Unit (Sloc (E2)))) | |
4586 | then | |
4587 | E := E2; | |
4588 | goto Found; | |
4589 | end if; | |
4590 | ||
4591 | E2 := Homonym (E2); | |
4592 | end loop; | |
4593 | ||
4de287c4 | 4594 | -- Entity must exist because predefined unit is correct |
5eb10f25 ES |
4595 | |
4596 | raise Program_Error; | |
4597 | ||
996ae0b0 RK |
4598 | else |
4599 | Nvis_Messages; | |
4600 | return; | |
4601 | end if; | |
4602 | end if; | |
4603 | end; | |
4604 | ||
4605 | -- Come here with E set to the first immediately visible entity on | |
4606 | -- the homonym chain. This is the one we want unless there is another | |
ff81221b ES |
4607 | -- immediately visible entity further on in the chain for an inner |
4608 | -- scope (RM 8.3(8)). | |
996ae0b0 RK |
4609 | |
4610 | <<Immediately_Visible_Entity>> declare | |
4611 | Level : Int; | |
4612 | Scop : Entity_Id; | |
4613 | ||
4614 | begin | |
ff81221b | 4615 | -- Find scope level of initial entity. When compiling through |
996ae0b0 RK |
4616 | -- Rtsfind, the previous context is not completely invisible, and |
4617 | -- an outer entity may appear on the chain, whose scope is below | |
4618 | -- the entry for Standard that delimits the current scope stack. | |
4619 | -- Indicate that the level for this spurious entry is outside of | |
4620 | -- the current scope stack. | |
4621 | ||
4622 | Level := Scope_Stack.Last; | |
4623 | loop | |
4624 | Scop := Scope_Stack.Table (Level).Entity; | |
4625 | exit when Scop = Scope (E); | |
4626 | Level := Level - 1; | |
4627 | exit when Scop = Standard_Standard; | |
4628 | end loop; | |
4629 | ||
4630 | -- Now search remainder of homonym chain for more inner entry | |
4631 | -- If the entity is Standard itself, it has no scope, and we | |
4632 | -- compare it with the stack entry directly. | |
4633 | ||
4634 | E2 := Homonym (E); | |
4635 | while Present (E2) loop | |
4636 | if Is_Immediately_Visible (E2) then | |
4de287c4 ES |
4637 | |
4638 | -- If a generic package contains a local declaration that | |
4639 | -- has the same name as the generic, there may be a visibility | |
4640 | -- conflict in an instance, where the local declaration must | |
4641 | -- also hide the name of the corresponding package renaming. | |
4642 | -- We check explicitly for a package declared by a renaming, | |
4643 | -- whose renamed entity is an instance that is on the scope | |
4644 | -- stack, and that contains a homonym in the same scope. Once | |
4645 | -- we have found it, we know that the package renaming is not | |
4646 | -- immediately visible, and that the identifier denotes the | |
4647 | -- other entity (and its homonyms if overloaded). | |
4648 | ||
4649 | if Scope (E) = Scope (E2) | |
4650 | and then Ekind (E) = E_Package | |
4651 | and then Present (Renamed_Object (E)) | |
4652 | and then Is_Generic_Instance (Renamed_Object (E)) | |
4653 | and then In_Open_Scopes (Renamed_Object (E)) | |
4654 | and then Comes_From_Source (N) | |
4655 | then | |
4656 | Set_Is_Immediately_Visible (E, False); | |
4657 | E := E2; | |
4658 | ||
4659 | else | |
4660 | for J in Level + 1 .. Scope_Stack.Last loop | |
4661 | if Scope_Stack.Table (J).Entity = Scope (E2) | |
4662 | or else Scope_Stack.Table (J).Entity = E2 | |
4663 | then | |
4664 | Level := J; | |
4665 | E := E2; | |
4666 | exit; | |
4667 | end if; | |
4668 | end loop; | |
4669 | end if; | |
996ae0b0 RK |
4670 | end if; |
4671 | ||
4672 | E2 := Homonym (E2); | |
4673 | end loop; | |
4674 | ||
4675 | -- At the end of that loop, E is the innermost immediately | |
4676 | -- visible entity, so we are all set. | |
4677 | end; | |
4678 | ||
4679 | -- Come here with entity found, and stored in E | |
4680 | ||
4681 | <<Found>> begin | |
4682 | ||
30196a76 RD |
4683 | -- Check violation of No_Wide_Characters restriction |
4684 | ||
4685 | Check_Wide_Character_Restriction (E, N); | |
4686 | ||
294ccb21 RD |
4687 | -- When distribution features are available (Get_PCS_Name /= |
4688 | -- Name_No_DSA), a remote access-to-subprogram type is converted | |
4689 | -- into a record type holding whatever information is needed to | |
f3d57416 | 4690 | -- perform a remote call on an RCI subprogram. In that case we |
294ccb21 RD |
4691 | -- rewrite any occurrence of the RAS type into the equivalent record |
4692 | -- type here. 'Access attribute references and RAS dereferences are | |
4693 | -- then implemented using specific TSSs. However when distribution is | |
4694 | -- not available (case of Get_PCS_Name = Name_No_DSA), we bypass the | |
4695 | -- generation of these TSSs, and we must keep the RAS type in its | |
4696 | -- original access-to-subprogram form (since all calls through a | |
4697 | -- value of such type will be local anyway in the absence of a PCS). | |
4698 | ||
996ae0b0 RK |
4699 | if Comes_From_Source (N) |
4700 | and then Is_Remote_Access_To_Subprogram_Type (E) | |
4701 | and then Expander_Active | |
a77842bd | 4702 | and then Get_PCS_Name /= Name_No_DSA |
996ae0b0 RK |
4703 | then |
4704 | Rewrite (N, | |
4705 | New_Occurrence_Of (Equivalent_Type (E), Sloc (N))); | |
4706 | return; | |
4707 | end if; | |
4708 | ||
6989bc1f AC |
4709 | -- Set the entity. Note that the reason we call Set_Entity for the |
4710 | -- overloadable case, as opposed to Set_Entity_With_Style_Check is | |
4711 | -- that in the overloaded case, the initial call can set the wrong | |
4712 | -- homonym. The call that sets the right homonym is in Sem_Res and | |
4713 | -- that call does use Set_Entity_With_Style_Check, so we don't miss | |
4714 | -- a style check. | |
4715 | ||
4716 | if Is_Overloadable (E) then | |
4717 | Set_Entity (N, E); | |
4718 | else | |
4719 | Set_Entity_With_Style_Check (N, E); | |
4720 | end if; | |
996ae0b0 RK |
4721 | |
4722 | if Is_Type (E) then | |
4723 | Set_Etype (N, E); | |
4724 | else | |
4725 | Set_Etype (N, Get_Full_View (Etype (E))); | |
4726 | end if; | |
4727 | ||
4728 | if Debug_Flag_E then | |
4729 | Write_Str (" found "); | |
4730 | Write_Entity_Info (E, " "); | |
4731 | end if; | |
4732 | ||
4733 | -- If the Ekind of the entity is Void, it means that all homonyms | |
4734 | -- are hidden from all visibility (RM 8.3(5,14-20)). However, this | |
4735 | -- test is skipped if the current scope is a record and the name is | |
4736 | -- a pragma argument expression (case of Atomic and Volatile pragmas | |
4737 | -- and possibly other similar pragmas added later, which are allowed | |
4738 | -- to reference components in the current record). | |
4739 | ||
4740 | if Ekind (E) = E_Void | |
4741 | and then | |
4742 | (not Is_Record_Type (Current_Scope) | |
4743 | or else Nkind (Parent (N)) /= N_Pragma_Argument_Association) | |
4744 | then | |
4745 | Premature_Usage (N); | |
4746 | ||
16ca248a ES |
4747 | -- If the entity is overloadable, collect all interpretations of the |
4748 | -- name for subsequent overload resolution. We optimize a bit here to | |
4749 | -- do this only if we have an overloadable entity that is not on its | |
4750 | -- own on the homonym chain. | |
996ae0b0 RK |
4751 | |
4752 | elsif Is_Overloadable (E) | |
4753 | and then (Present (Homonym (E)) or else Current_Entity (N) /= E) | |
4754 | then | |
4755 | Collect_Interps (N); | |
4756 | ||
bc41faa2 | 4757 | -- If no homonyms were visible, the entity is unambiguous |
996ae0b0 RK |
4758 | |
4759 | if not Is_Overloaded (N) then | |
67ce0d7e RD |
4760 | if not Is_Actual_Parameter then |
4761 | Generate_Reference (E, N); | |
4762 | end if; | |
996ae0b0 RK |
4763 | end if; |
4764 | ||
4765 | -- Case of non-overloadable entity, set the entity providing that | |
4766 | -- we do not have the case of a discriminant reference within a | |
4767 | -- default expression. Such references are replaced with the | |
4768 | -- corresponding discriminal, which is the formal corresponding to | |
4769 | -- to the discriminant in the initialization procedure. | |
4770 | ||
996ae0b0 | 4771 | else |
294ccb21 RD |
4772 | -- Entity is unambiguous, indicate that it is referenced here |
4773 | ||
4774 | -- For a renaming of an object, always generate simple reference, | |
4775 | -- we don't try to keep track of assignments in this case. | |
4776 | ||
4777 | if Is_Object (E) and then Present (Renamed_Object (E)) then | |
4778 | Generate_Reference (E, N); | |
996ae0b0 | 4779 | |
21d27997 RD |
4780 | -- If the renamed entity is a private protected component, |
4781 | -- reference the original component as well. This needs to be | |
4782 | -- done because the private renamings are installed before any | |
f3d0f304 | 4783 | -- analysis has occurred. Reference to a private component will |
21d27997 RD |
4784 | -- resolve to the renaming and the original component will be |
4785 | -- left unreferenced, hence the following. | |
4786 | ||
4787 | if Is_Prival (E) then | |
4788 | Generate_Reference (Prival_Link (E), N); | |
4789 | end if; | |
4790 | ||
294ccb21 RD |
4791 | -- One odd case is that we do not want to set the Referenced flag |
4792 | -- if the entity is a label, and the identifier is the label in | |
4793 | -- the source, since this is not a reference from the point of | |
4794 | -- view of the user. | |
4795 | ||
4796 | elsif Nkind (Parent (N)) = N_Label then | |
996ae0b0 RK |
4797 | declare |
4798 | R : constant Boolean := Referenced (E); | |
294ccb21 | 4799 | |
996ae0b0 | 4800 | begin |
294ccb21 RD |
4801 | -- Generate reference unless this is an actual parameter |
4802 | -- (see comment below) | |
4803 | ||
4804 | if Is_Actual_Parameter then | |
67ce0d7e RD |
4805 | Generate_Reference (E, N); |
4806 | Set_Referenced (E, R); | |
4807 | end if; | |
996ae0b0 RK |
4808 | end; |
4809 | ||
11560bcc TQ |
4810 | -- Normal case, not a label: generate reference |
4811 | ||
61c161b2 AC |
4812 | -- ??? It is too early to generate a reference here even if the |
4813 | -- entity is unambiguous, because the tree is not sufficiently | |
4814 | -- typed at this point for Generate_Reference to determine | |
4815 | -- whether this reference modifies the denoted object (because | |
4816 | -- implicit dereferences cannot be identified prior to full type | |
4817 | -- resolution). | |
4818 | ||
21d27997 RD |
4819 | -- The Is_Actual_Parameter routine takes care of one of these |
4820 | -- cases but there are others probably ??? | |
61c161b2 | 4821 | |
84df40f7 | 4822 | -- If the entity is the LHS of an assignment, and is a variable |
61c161b2 | 4823 | -- (rather than a package prefix), we can mark it as a |
84df40f7 | 4824 | -- modification right away, to avoid duplicate references. |
fbf5a39b | 4825 | |
996ae0b0 | 4826 | else |
67ce0d7e | 4827 | if not Is_Actual_Parameter then |
84df40f7 AC |
4828 | if Is_LHS (N) |
4829 | and then Ekind (E) /= E_Package | |
4830 | and then Ekind (E) /= E_Generic_Package | |
4831 | then | |
4832 | Generate_Reference (E, N, 'm'); | |
4833 | else | |
4834 | Generate_Reference (E, N); | |
4835 | end if; | |
67ce0d7e RD |
4836 | end if; |
4837 | ||
fbe627af | 4838 | Check_Nested_Access (E); |
996ae0b0 RK |
4839 | end if; |
4840 | ||
4c484f40 | 4841 | Set_Entity_Or_Discriminal (N, E); |
d50f4827 AC |
4842 | |
4843 | if Ada_Version >= Ada_2012 | |
444acbdd AC |
4844 | and then |
4845 | (Nkind (Parent (N)) in N_Subexpr | |
4846 | or else Nkind (Parent (N)) = N_Object_Declaration) | |
d50f4827 AC |
4847 | then |
4848 | Check_Implicit_Dereference (N, Etype (E)); | |
4849 | end if; | |
996ae0b0 RK |
4850 | end if; |
4851 | end; | |
4852 | end Find_Direct_Name; | |
4853 | ||
4854 | ------------------------ | |
4855 | -- Find_Expanded_Name -- | |
4856 | ------------------------ | |
4857 | ||
4858 | -- This routine searches the homonym chain of the entity until it finds | |
4859 | -- an entity declared in the scope denoted by the prefix. If the entity | |
4860 | -- is private, it may nevertheless be immediately visible, if we are in | |
4861 | -- the scope of its declaration. | |
4862 | ||
4863 | procedure Find_Expanded_Name (N : Node_Id) is | |
07fc65c4 GB |
4864 | Selector : constant Node_Id := Selector_Name (N); |
4865 | Candidate : Entity_Id := Empty; | |
996ae0b0 RK |
4866 | P_Name : Entity_Id; |
4867 | O_Name : Entity_Id; | |
4868 | Id : Entity_Id; | |
4869 | ||
4870 | begin | |
4871 | P_Name := Entity (Prefix (N)); | |
4872 | O_Name := P_Name; | |
4873 | ||
ff81221b ES |
4874 | -- If the prefix is a renamed package, look for the entity in the |
4875 | -- original package. | |
996ae0b0 RK |
4876 | |
4877 | if Ekind (P_Name) = E_Package | |
4878 | and then Present (Renamed_Object (P_Name)) | |
4879 | then | |
4880 | P_Name := Renamed_Object (P_Name); | |
4881 | ||
4882 | -- Rewrite node with entity field pointing to renamed object | |
4883 | ||
4884 | Rewrite (Prefix (N), New_Copy (Prefix (N))); | |
4885 | Set_Entity (Prefix (N), P_Name); | |
4886 | ||
4887 | -- If the prefix is an object of a concurrent type, look for | |
4888 | -- the entity in the associated task or protected type. | |
4889 | ||
4890 | elsif Is_Concurrent_Type (Etype (P_Name)) then | |
4891 | P_Name := Etype (P_Name); | |
4892 | end if; | |
4893 | ||
4894 | Id := Current_Entity (Selector); | |
4895 | ||
923fa078 RD |
4896 | declare |
4897 | Is_New_Candidate : Boolean; | |
996ae0b0 | 4898 | |
923fa078 RD |
4899 | begin |
4900 | while Present (Id) loop | |
4901 | if Scope (Id) = P_Name then | |
4902 | Candidate := Id; | |
4903 | Is_New_Candidate := True; | |
4904 | ||
4905 | -- Ada 2005 (AI-217): Handle shadow entities associated with types | |
4906 | -- declared in limited-withed nested packages. We don't need to | |
4907 | -- handle E_Incomplete_Subtype entities because the entities in | |
4908 | -- the limited view are always E_Incomplete_Type entities (see | |
4909 | -- Build_Limited_Views). Regarding the expression used to evaluate | |
4910 | -- the scope, it is important to note that the limited view also | |
4911 | -- has shadow entities associated nested packages. For this reason | |
4912 | -- the correct scope of the entity is the scope of the real entity | |
11560bcc TQ |
4913 | -- The non-limited view may itself be incomplete, in which case |
4914 | -- get the full view if available. | |
923fa078 RD |
4915 | |
4916 | elsif From_With_Type (Id) | |
4917 | and then Is_Type (Id) | |
4918 | and then Ekind (Id) = E_Incomplete_Type | |
4919 | and then Present (Non_Limited_View (Id)) | |
4920 | and then Scope (Non_Limited_View (Id)) = P_Name | |
4921 | then | |
11560bcc | 4922 | Candidate := Get_Full_View (Non_Limited_View (Id)); |
923fa078 | 4923 | Is_New_Candidate := True; |
996ae0b0 RK |
4924 | |
4925 | else | |
923fa078 | 4926 | Is_New_Candidate := False; |
996ae0b0 | 4927 | end if; |
996ae0b0 | 4928 | |
923fa078 RD |
4929 | if Is_New_Candidate then |
4930 | if Is_Child_Unit (Id) then | |
4931 | exit when Is_Visible_Child_Unit (Id) | |
4932 | or else Is_Immediately_Visible (Id); | |
4933 | ||
4934 | else | |
4935 | exit when not Is_Hidden (Id) | |
4936 | or else Is_Immediately_Visible (Id); | |
4937 | end if; | |
4938 | end if; | |
4939 | ||
4940 | Id := Homonym (Id); | |
4941 | end loop; | |
4942 | end; | |
996ae0b0 RK |
4943 | |
4944 | if No (Id) | |
4945 | and then (Ekind (P_Name) = E_Procedure | |
4946 | or else | |
4947 | Ekind (P_Name) = E_Function) | |
4948 | and then Is_Generic_Instance (P_Name) | |
4949 | then | |
4950 | -- Expanded name denotes entity in (instance of) generic subprogram. | |
4951 | -- The entity may be in the subprogram instance, or may denote one of | |
4952 | -- the formals, which is declared in the enclosing wrapper package. | |
4953 | ||
4954 | P_Name := Scope (P_Name); | |
996ae0b0 | 4955 | |
bc41faa2 | 4956 | Id := Current_Entity (Selector); |
996ae0b0 | 4957 | while Present (Id) loop |
bc41faa2 | 4958 | exit when Scope (Id) = P_Name; |
996ae0b0 RK |
4959 | Id := Homonym (Id); |
4960 | end loop; | |
4961 | end if; | |
4962 | ||
bc41faa2 | 4963 | if No (Id) or else Chars (Id) /= Chars (Selector) then |
996ae0b0 RK |
4964 | Set_Etype (N, Any_Type); |
4965 | ||
ff81221b ES |
4966 | -- If we are looking for an entity defined in System, try to find it |
4967 | -- in the child package that may have been provided as an extension | |
4968 | -- to System. The Extend_System pragma will have supplied the name of | |
4969 | -- the extension, which may have to be loaded. | |
996ae0b0 RK |
4970 | |
4971 | if Chars (P_Name) = Name_System | |
4972 | and then Scope (P_Name) = Standard_Standard | |
fbf5a39b | 4973 | and then Present (System_Extend_Unit) |
996ae0b0 RK |
4974 | and then Present_System_Aux (N) |
4975 | then | |
4976 | Set_Entity (Prefix (N), System_Aux_Id); | |
4977 | Find_Expanded_Name (N); | |
4978 | return; | |
4979 | ||
fbf5a39b AC |
4980 | elsif Nkind (Selector) = N_Operator_Symbol |
4981 | and then Has_Implicit_Operator (N) | |
996ae0b0 RK |
4982 | then |
4983 | -- There is an implicit instance of the predefined operator in | |
4984 | -- the given scope. The operator entity is defined in Standard. | |
4985 | -- Has_Implicit_Operator makes the node into an Expanded_Name. | |
4986 | ||
4987 | return; | |
4988 | ||
4989 | elsif Nkind (Selector) = N_Character_Literal | |
4990 | and then Has_Implicit_Character_Literal (N) | |
4991 | then | |
4992 | -- If there is no literal defined in the scope denoted by the | |
4993 | -- prefix, the literal may belong to (a type derived from) | |
4994 | -- Standard_Character, for which we have no explicit literals. | |
4995 | ||
4996 | return; | |
4997 | ||
4998 | else | |
ff81221b ES |
4999 | -- If the prefix is a single concurrent object, use its name in |
5000 | -- the error message, rather than that of the anonymous type. | |
996ae0b0 RK |
5001 | |
5002 | if Is_Concurrent_Type (P_Name) | |
5003 | and then Is_Internal_Name (Chars (P_Name)) | |
5004 | then | |
5005 | Error_Msg_Node_2 := Entity (Prefix (N)); | |
5006 | else | |
5007 | Error_Msg_Node_2 := P_Name; | |
5008 | end if; | |
5009 | ||
5010 | if P_Name = System_Aux_Id then | |
5011 | P_Name := Scope (P_Name); | |
5012 | Set_Entity (Prefix (N), P_Name); | |
5013 | end if; | |
5014 | ||
5015 | if Present (Candidate) then | |
5016 | ||
16ca248a ES |
5017 | -- If we know that the unit is a child unit we can give a more |
5018 | -- accurate error message. | |
5019 | ||
996ae0b0 | 5020 | if Is_Child_Unit (Candidate) then |
edd63e9b | 5021 | |
16ca248a ES |
5022 | -- If the candidate is a private child unit and we are in |
5023 | -- the visible part of a public unit, specialize the error | |
5024 | -- message. There might be a private with_clause for it, | |
5025 | -- but it is not currently active. | |
edd63e9b ES |
5026 | |
5027 | if Is_Private_Descendant (Candidate) | |
5028 | and then Ekind (Current_Scope) = E_Package | |
5029 | and then not In_Private_Part (Current_Scope) | |
5030 | and then not Is_Private_Descendant (Current_Scope) | |
5031 | then | |
5032 | Error_Msg_N ("private child unit& is not visible here", | |
16ca248a ES |
5033 | Selector); |
5034 | ||
5035 | -- Normal case where we have a missing with for a child unit | |
5036 | ||
edd63e9b | 5037 | else |
16ca248a | 5038 | Error_Msg_Qual_Level := 99; |
ed2233dc AC |
5039 | Error_Msg_NE -- CODEFIX |
5040 | ("missing `WITH &;`", Selector, Candidate); | |
16ca248a | 5041 | Error_Msg_Qual_Level := 0; |
edd63e9b | 5042 | end if; |
16ca248a ES |
5043 | |
5044 | -- Here we don't know that this is a child unit | |
5045 | ||
996ae0b0 RK |
5046 | else |
5047 | Error_Msg_NE ("& is not a visible entity of&", N, Selector); | |
5048 | end if; | |
5049 | ||
5050 | else | |
5051 | -- Within the instantiation of a child unit, the prefix may | |
16ca248a ES |
5052 | -- denote the parent instance, but the selector has the name |
5053 | -- of the original child. Find whether we are within the | |
5054 | -- corresponding instance, and get the proper entity, which | |
996ae0b0 RK |
5055 | -- can only be an enclosing scope. |
5056 | ||
5057 | if O_Name /= P_Name | |
5058 | and then In_Open_Scopes (P_Name) | |
5059 | and then Is_Generic_Instance (P_Name) | |
5060 | then | |
5061 | declare | |
5062 | S : Entity_Id := Current_Scope; | |
5063 | P : Entity_Id; | |
5064 | ||
5065 | begin | |
5066 | for J in reverse 0 .. Scope_Stack.Last loop | |
5067 | S := Scope_Stack.Table (J).Entity; | |
5068 | ||
5069 | exit when S = Standard_Standard; | |
5070 | ||
bce79204 AC |
5071 | if Ekind_In (S, E_Function, |
5072 | E_Package, | |
5073 | E_Procedure) | |
996ae0b0 RK |
5074 | then |
5075 | P := Generic_Parent (Specification | |
5076 | (Unit_Declaration_Node (S))); | |
5077 | ||
5078 | if Present (P) | |
5079 | and then Chars (Scope (P)) = Chars (O_Name) | |
5080 | and then Chars (P) = Chars (Selector) | |
5081 | then | |
5082 | Id := S; | |
a77842bd | 5083 | goto Found; |
996ae0b0 RK |
5084 | end if; |
5085 | end if; | |
5086 | ||
5087 | end loop; | |
5088 | end; | |
5089 | end if; | |
5090 | ||
16ca248a ES |
5091 | -- If this is a selection from Ada, System or Interfaces, then |
5092 | -- we assume a missing with for the corresponding package. | |
5093 | ||
5094 | if Is_Known_Unit (N) then | |
fbe627af RD |
5095 | if not Error_Posted (N) then |
5096 | Error_Msg_Node_2 := Selector; | |
ed2233dc AC |
5097 | Error_Msg_N -- CODEFIX |
5098 | ("missing `WITH &.&;`", Prefix (N)); | |
fbe627af | 5099 | end if; |
996ae0b0 | 5100 | |
16ca248a ES |
5101 | -- If this is a selection from a dummy package, then suppress |
5102 | -- the error message, of course the entity is missing if the | |
5103 | -- package is missing! | |
996ae0b0 RK |
5104 | |
5105 | elsif Sloc (Error_Msg_Node_2) = No_Location then | |
5106 | null; | |
5107 | ||
5108 | -- Here we have the case of an undefined component | |
5109 | ||
5110 | else | |
d6a24cdb AC |
5111 | |
5112 | -- The prefix may hide a homonym in the context that | |
5113 | -- declares the desired entity. This error can use a | |
5114 | -- specialized message. | |
5115 | ||
5116 | if In_Open_Scopes (P_Name) | |
5117 | and then Present (Homonym (P_Name)) | |
5118 | and then Is_Compilation_Unit (Homonym (P_Name)) | |
5119 | and then | |
5120 | (Is_Immediately_Visible (Homonym (P_Name)) | |
5121 | or else Is_Visible_Child_Unit (Homonym (P_Name))) | |
5122 | then | |
5123 | declare | |
5124 | H : constant Entity_Id := Homonym (P_Name); | |
0d354370 | 5125 | |
d6a24cdb AC |
5126 | begin |
5127 | Id := First_Entity (H); | |
5128 | while Present (Id) loop | |
d6a24cdb AC |
5129 | if Chars (Id) = Chars (Selector) then |
5130 | Error_Msg_Qual_Level := 99; | |
5131 | Error_Msg_Name_1 := Chars (Selector); | |
5132 | Error_Msg_NE | |
5133 | ("% not declared in&", N, P_Name); | |
5134 | Error_Msg_NE | |
5135 | ("\use fully qualified name starting with" | |
5136 | & " Standard to make& visible", N, H); | |
5137 | Error_Msg_Qual_Level := 0; | |
689cb4ac | 5138 | goto Done; |
d6a24cdb AC |
5139 | end if; |
5140 | ||
5141 | Next_Entity (Id); | |
5142 | end loop; | |
689cb4ac | 5143 | |
3e24afaa | 5144 | -- If not found, standard error message |
689cb4ac AC |
5145 | |
5146 | Error_Msg_NE ("& not declared in&", N, Selector); | |
5147 | ||
5148 | <<Done>> null; | |
d6a24cdb AC |
5149 | end; |
5150 | ||
5151 | else | |
5152 | Error_Msg_NE ("& not declared in&", N, Selector); | |
5153 | end if; | |
996ae0b0 | 5154 | |
bc41faa2 | 5155 | -- Check for misspelling of some entity in prefix |
996ae0b0 RK |
5156 | |
5157 | Id := First_Entity (P_Name); | |
294ccb21 RD |
5158 | while Present (Id) loop |
5159 | if Is_Bad_Spelling_Of (Chars (Id), Chars (Selector)) | |
5160 | and then not Is_Internal_Name (Chars (Id)) | |
5161 | then | |
deef4289 | 5162 | Error_Msg_NE -- CODEFIX |
294ccb21 RD |
5163 | ("possible misspelling of&", Selector, Id); |
5164 | exit; | |
5165 | end if; | |
996ae0b0 | 5166 | |
294ccb21 RD |
5167 | Next_Entity (Id); |
5168 | end loop; | |
996ae0b0 RK |
5169 | |
5170 | -- Specialize the message if this may be an instantiation | |
5171 | -- of a child unit that was not mentioned in the context. | |
5172 | ||
5173 | if Nkind (Parent (N)) = N_Package_Instantiation | |
5174 | and then Is_Generic_Instance (Entity (Prefix (N))) | |
5175 | and then Is_Compilation_Unit | |
294ccb21 | 5176 | (Generic_Parent (Parent (Entity (Prefix (N))))) |
996ae0b0 | 5177 | then |
16ca248a | 5178 | Error_Msg_Node_2 := Selector; |
ed2233dc AC |
5179 | Error_Msg_N -- CODEFIX |
5180 | ("\missing `WITH &.&;`", Prefix (N)); | |
996ae0b0 RK |
5181 | end if; |
5182 | end if; | |
5183 | end if; | |
5184 | ||
5185 | Id := Any_Id; | |
5186 | end if; | |
5187 | end if; | |
5188 | ||
a77842bd | 5189 | <<Found>> |
996ae0b0 RK |
5190 | if Comes_From_Source (N) |
5191 | and then Is_Remote_Access_To_Subprogram_Type (Id) | |
a77842bd | 5192 | and then Present (Equivalent_Type (Id)) |
996ae0b0 | 5193 | then |
16ca248a ES |
5194 | -- If we are not actually generating distribution code (i.e. the |
5195 | -- current PCS is the dummy non-distributed version), then the | |
5196 | -- Equivalent_Type will be missing, and Id should be treated as | |
5197 | -- a regular access-to-subprogram type. | |
a77842bd | 5198 | |
996ae0b0 RK |
5199 | Id := Equivalent_Type (Id); |
5200 | Set_Chars (Selector, Chars (Id)); | |
5201 | end if; | |
5202 | ||
0ab80019 | 5203 | -- Ada 2005 (AI-50217): Check usage of entities in limited withed units |
19f0526a | 5204 | |
996ae0b0 RK |
5205 | if Ekind (P_Name) = E_Package |
5206 | and then From_With_Type (P_Name) | |
5207 | then | |
5208 | if From_With_Type (Id) | |
0fb2ea01 AC |
5209 | or else Is_Type (Id) |
5210 | or else Ekind (Id) = E_Package | |
996ae0b0 RK |
5211 | then |
5212 | null; | |
5213 | else | |
5214 | Error_Msg_N | |
657a9dd9 | 5215 | ("limited withed package can only be used to access " |
21d27997 | 5216 | & "incomplete types", |
996ae0b0 RK |
5217 | N); |
5218 | end if; | |
5219 | end if; | |
5220 | ||
5221 | if Is_Task_Type (P_Name) | |
5222 | and then ((Ekind (Id) = E_Entry | |
294ccb21 RD |
5223 | and then Nkind (Parent (N)) /= N_Attribute_Reference) |
5224 | or else | |
5225 | (Ekind (Id) = E_Entry_Family | |
5226 | and then | |
5227 | Nkind (Parent (Parent (N))) /= N_Attribute_Reference)) | |
996ae0b0 | 5228 | then |
16ca248a ES |
5229 | -- It is an entry call after all, either to the current task (which |
5230 | -- will deadlock) or to an enclosing task. | |
996ae0b0 RK |
5231 | |
5232 | Analyze_Selected_Component (N); | |
5233 | return; | |
5234 | end if; | |
5235 | ||
5236 | Change_Selected_Component_To_Expanded_Name (N); | |
07fc65c4 GB |
5237 | |
5238 | -- Do style check and generate reference, but skip both steps if this | |
16ca248a ES |
5239 | -- entity has homonyms, since we may not have the right homonym set yet. |
5240 | -- The proper homonym will be set during the resolve phase. | |
07fc65c4 GB |
5241 | |
5242 | if Has_Homonym (Id) then | |
5243 | Set_Entity (N, Id); | |
5244 | else | |
4c484f40 | 5245 | Set_Entity_Or_Discriminal (N, Id); |
84df40f7 AC |
5246 | |
5247 | if Is_LHS (N) then | |
5248 | Generate_Reference (Id, N, 'm'); | |
5249 | else | |
5250 | Generate_Reference (Id, N); | |
5251 | end if; | |
07fc65c4 | 5252 | end if; |
996ae0b0 RK |
5253 | |
5254 | if Is_Type (Id) then | |
5255 | Set_Etype (N, Id); | |
5256 | else | |
5257 | Set_Etype (N, Get_Full_View (Etype (Id))); | |
5258 | end if; | |
5259 | ||
30196a76 RD |
5260 | -- Check for violation of No_Wide_Characters |
5261 | ||
5262 | Check_Wide_Character_Restriction (Id, N); | |
5263 | ||
16ca248a ES |
5264 | -- If the Ekind of the entity is Void, it means that all homonyms are |
5265 | -- hidden from all visibility (RM 8.3(5,14-20)). | |
996ae0b0 RK |
5266 | |
5267 | if Ekind (Id) = E_Void then | |
5268 | Premature_Usage (N); | |
5269 | ||
5270 | elsif Is_Overloadable (Id) | |
5271 | and then Present (Homonym (Id)) | |
5272 | then | |
5273 | declare | |
5274 | H : Entity_Id := Homonym (Id); | |
5275 | ||
5276 | begin | |
5277 | while Present (H) loop | |
35ae2ed8 AC |
5278 | if Scope (H) = Scope (Id) |
5279 | and then | |
5280 | (not Is_Hidden (H) | |
5281 | or else Is_Immediately_Visible (H)) | |
5282 | then | |
996ae0b0 RK |
5283 | Collect_Interps (N); |
5284 | exit; | |
5285 | end if; | |
5286 | ||
5287 | H := Homonym (H); | |
5288 | end loop; | |
fbf5a39b | 5289 | |
16ca248a ES |
5290 | -- If an extension of System is present, collect possible explicit |
5291 | -- overloadings declared in the extension. | |
fbf5a39b AC |
5292 | |
5293 | if Chars (P_Name) = Name_System | |
5294 | and then Scope (P_Name) = Standard_Standard | |
5295 | and then Present (System_Extend_Unit) | |
5296 | and then Present_System_Aux (N) | |
5297 | then | |
5298 | H := Current_Entity (Id); | |
5299 | ||
5300 | while Present (H) loop | |
5301 | if Scope (H) = System_Aux_Id then | |
5302 | Add_One_Interp (N, H, Etype (H)); | |
5303 | end if; | |
5304 | ||
5305 | H := Homonym (H); | |
5306 | end loop; | |
5307 | end if; | |
996ae0b0 RK |
5308 | end; |
5309 | end if; | |
5310 | ||
5311 | if Nkind (Selector_Name (N)) = N_Operator_Symbol | |
5312 | and then Scope (Id) /= Standard_Standard | |
5313 | then | |
16ca248a ES |
5314 | -- In addition to user-defined operators in the given scope, there |
5315 | -- may be an implicit instance of the predefined operator. The | |
5316 | -- operator (defined in Standard) is found in Has_Implicit_Operator, | |
5317 | -- and added to the interpretations. Procedure Add_One_Interp will | |
5318 | -- determine which hides which. | |
996ae0b0 RK |
5319 | |
5320 | if Has_Implicit_Operator (N) then | |
5321 | null; | |
5322 | end if; | |
5323 | end if; | |
5324 | end Find_Expanded_Name; | |
5325 | ||
5326 | ------------------------- | |
5327 | -- Find_Renamed_Entity -- | |
5328 | ------------------------- | |
5329 | ||
5330 | function Find_Renamed_Entity | |
5331 | (N : Node_Id; | |
5332 | Nam : Node_Id; | |
5333 | New_S : Entity_Id; | |
5334 | Is_Actual : Boolean := False) return Entity_Id | |
5335 | is | |
fbf5a39b | 5336 | Ind : Interp_Index; |
996ae0b0 RK |
5337 | I1 : Interp_Index := 0; -- Suppress junk warnings |
5338 | It : Interp; | |
5339 | It1 : Interp; | |
5340 | Old_S : Entity_Id; | |
5341 | Inst : Entity_Id; | |
5342 | ||
5343 | function Enclosing_Instance return Entity_Id; | |
5344 | -- If the renaming determines the entity for the default of a formal | |
5345 | -- subprogram nested within another instance, choose the innermost | |
5346 | -- candidate. This is because if the formal has a box, and we are within | |
5347 | -- an enclosing instance where some candidate interpretations are local | |
5348 | -- to this enclosing instance, we know that the default was properly | |
5349 | -- resolved when analyzing the generic, so we prefer the local | |
5350 | -- candidates to those that are external. This is not always the case | |
16ca248a ES |
5351 | -- but is a reasonable heuristic on the use of nested generics. The |
5352 | -- proper solution requires a full renaming model. | |
996ae0b0 | 5353 | |
996ae0b0 RK |
5354 | function Is_Visible_Operation (Op : Entity_Id) return Boolean; |
5355 | -- If the renamed entity is an implicit operator, check whether it is | |
16ca248a ES |
5356 | -- visible because its operand type is properly visible. This check |
5357 | -- applies to explicit renamed entities that appear in the source in a | |
5358 | -- renaming declaration or a formal subprogram instance, but not to | |
5359 | -- default generic actuals with a name. | |
996ae0b0 | 5360 | |
923fa078 RD |
5361 | function Report_Overload return Entity_Id; |
5362 | -- List possible interpretations, and specialize message in the | |
5363 | -- case of a generic actual. | |
5364 | ||
5365 | function Within (Inner, Outer : Entity_Id) return Boolean; | |
16ca248a ES |
5366 | -- Determine whether a candidate subprogram is defined within the |
5367 | -- enclosing instance. If yes, it has precedence over outer candidates. | |
923fa078 | 5368 | |
996ae0b0 RK |
5369 | ------------------------ |
5370 | -- Enclosing_Instance -- | |
5371 | ------------------------ | |
5372 | ||
5373 | function Enclosing_Instance return Entity_Id is | |
5374 | S : Entity_Id; | |
5375 | ||
5376 | begin | |
5377 | if not Is_Generic_Instance (Current_Scope) | |
5378 | and then not Is_Actual | |
5379 | then | |
5380 | return Empty; | |
5381 | end if; | |
5382 | ||
5383 | S := Scope (Current_Scope); | |
996ae0b0 | 5384 | while S /= Standard_Standard loop |
996ae0b0 RK |
5385 | if Is_Generic_Instance (S) then |
5386 | return S; | |
5387 | end if; | |
5388 | ||
5389 | S := Scope (S); | |
5390 | end loop; | |
5391 | ||
5392 | return Empty; | |
5393 | end Enclosing_Instance; | |
5394 | ||
5395 | -------------------------- | |
5396 | -- Is_Visible_Operation -- | |
5397 | -------------------------- | |
5398 | ||
5399 | function Is_Visible_Operation (Op : Entity_Id) return Boolean is | |
5400 | Scop : Entity_Id; | |
5401 | Typ : Entity_Id; | |
5402 | Btyp : Entity_Id; | |
5403 | ||
5404 | begin | |
5405 | if Ekind (Op) /= E_Operator | |
5406 | or else Scope (Op) /= Standard_Standard | |
5407 | or else (In_Instance | |
5408 | and then | |
5409 | (not Is_Actual | |
5410 | or else Present (Enclosing_Instance))) | |
5411 | then | |
5412 | return True; | |
5413 | ||
5414 | else | |
5415 | -- For a fixed point type operator, check the resulting type, | |
5416 | -- because it may be a mixed mode integer * fixed operation. | |
5417 | ||
5418 | if Present (Next_Formal (First_Formal (New_S))) | |
5419 | and then Is_Fixed_Point_Type (Etype (New_S)) | |
5420 | then | |
5421 | Typ := Etype (New_S); | |
5422 | else | |
5423 | Typ := Etype (First_Formal (New_S)); | |
5424 | end if; | |
5425 | ||
5426 | Btyp := Base_Type (Typ); | |
5427 | ||
5428 | if Nkind (Nam) /= N_Expanded_Name then | |
5429 | return (In_Open_Scopes (Scope (Btyp)) | |
5430 | or else Is_Potentially_Use_Visible (Btyp) | |
5431 | or else In_Use (Btyp) | |
5432 | or else In_Use (Scope (Btyp))); | |
5433 | ||
5434 | else | |
5435 | Scop := Entity (Prefix (Nam)); | |
5436 | ||
5437 | if Ekind (Scop) = E_Package | |
5438 | and then Present (Renamed_Object (Scop)) | |
5439 | then | |
5440 | Scop := Renamed_Object (Scop); | |
5441 | end if; | |
5442 | ||
5443 | -- Operator is visible if prefix of expanded name denotes | |
16b05213 | 5444 | -- scope of type, or else type is defined in System_Aux |
996ae0b0 RK |
5445 | -- and the prefix denotes System. |
5446 | ||
5447 | return Scope (Btyp) = Scop | |
5448 | or else (Scope (Btyp) = System_Aux_Id | |
5449 | and then Scope (Scope (Btyp)) = Scop); | |
5450 | end if; | |
5451 | end if; | |
5452 | end Is_Visible_Operation; | |
5453 | ||
5454 | ------------ | |
5455 | -- Within -- | |
5456 | ------------ | |
5457 | ||
5458 | function Within (Inner, Outer : Entity_Id) return Boolean is | |
16ca248a | 5459 | Sc : Entity_Id; |
996ae0b0 RK |
5460 | |
5461 | begin | |
16ca248a | 5462 | Sc := Scope (Inner); |
996ae0b0 | 5463 | while Sc /= Standard_Standard loop |
996ae0b0 RK |
5464 | if Sc = Outer then |
5465 | return True; | |
5466 | else | |
5467 | Sc := Scope (Sc); | |
5468 | end if; | |
5469 | end loop; | |
5470 | ||
5471 | return False; | |
5472 | end Within; | |
5473 | ||
923fa078 RD |
5474 | --------------------- |
5475 | -- Report_Overload -- | |
5476 | --------------------- | |
fbf5a39b AC |
5477 | |
5478 | function Report_Overload return Entity_Id is | |
5479 | begin | |
5480 | if Is_Actual then | |
ed2233dc | 5481 | Error_Msg_NE -- CODEFIX |
fbf5a39b | 5482 | ("ambiguous actual subprogram&, " & |
923fa078 | 5483 | "possible interpretations:", N, Nam); |
fbf5a39b | 5484 | else |
ed2233dc | 5485 | Error_Msg_N -- CODEFIX |
fbf5a39b | 5486 | ("ambiguous subprogram, " & |
923fa078 | 5487 | "possible interpretations:", N); |
fbf5a39b AC |
5488 | end if; |
5489 | ||
5490 | List_Interps (Nam, N); | |
5491 | return Old_S; | |
5492 | end Report_Overload; | |
5493 | ||
0187b60e | 5494 | -- Start of processing for Find_Renamed_Entity |
996ae0b0 RK |
5495 | |
5496 | begin | |
5497 | Old_S := Any_Id; | |
5498 | Candidate_Renaming := Empty; | |
5499 | ||
5500 | if not Is_Overloaded (Nam) then | |
70b70ce8 AC |
5501 | if Entity_Matches_Spec (Entity (Nam), New_S) then |
5502 | Candidate_Renaming := New_S; | |
5503 | ||
5504 | if Is_Visible_Operation (Entity (Nam)) then | |
5505 | Old_S := Entity (Nam); | |
5506 | end if; | |
996ae0b0 RK |
5507 | |
5508 | elsif | |
5509 | Present (First_Formal (Entity (Nam))) | |
5510 | and then Present (First_Formal (New_S)) | |
5511 | and then (Base_Type (Etype (First_Formal (Entity (Nam)))) | |
5512 | = Base_Type (Etype (First_Formal (New_S)))) | |
5513 | then | |
5514 | Candidate_Renaming := Entity (Nam); | |
5515 | end if; | |
5516 | ||
5517 | else | |
fbf5a39b | 5518 | Get_First_Interp (Nam, Ind, It); |
996ae0b0 | 5519 | while Present (It.Nam) loop |
996ae0b0 RK |
5520 | if Entity_Matches_Spec (It.Nam, New_S) |
5521 | and then Is_Visible_Operation (It.Nam) | |
5522 | then | |
5523 | if Old_S /= Any_Id then | |
5524 | ||
5525 | -- Note: The call to Disambiguate only happens if a | |
5526 | -- previous interpretation was found, in which case I1 | |
5527 | -- has received a value. | |
5528 | ||
fbf5a39b | 5529 | It1 := Disambiguate (Nam, I1, Ind, Etype (Old_S)); |
996ae0b0 RK |
5530 | |
5531 | if It1 = No_Interp then | |
996ae0b0 RK |
5532 | Inst := Enclosing_Instance; |
5533 | ||
5534 | if Present (Inst) then | |
996ae0b0 | 5535 | if Within (It.Nam, Inst) then |
444acbdd AC |
5536 | if Within (Old_S, Inst) then |
5537 | ||
5538 | -- Choose the innermost subprogram, which would | |
5539 | -- have hidden the outer one in the generic. | |
5540 | ||
5541 | if Scope_Depth (It.Nam) < | |
5542 | Scope_Depth (Old_S) | |
5543 | then | |
5544 | return Old_S; | |
444acbdd AC |
5545 | else |
5546 | return It.Nam; | |
5547 | end if; | |
5548 | end if; | |
5549 | ||
996ae0b0 RK |
5550 | elsif Within (Old_S, Inst) then |
5551 | return (Old_S); | |
444acbdd | 5552 | |
996ae0b0 | 5553 | else |
fbf5a39b | 5554 | return Report_Overload; |
996ae0b0 RK |
5555 | end if; |
5556 | ||
3ddd922e | 5557 | -- If not within an instance, ambiguity is real |
444acbdd | 5558 | |
996ae0b0 | 5559 | else |
fbf5a39b | 5560 | return Report_Overload; |
996ae0b0 RK |
5561 | end if; |
5562 | ||
5563 | else | |
5564 | Old_S := It1.Nam; | |
5565 | exit; | |
5566 | end if; | |
5567 | ||
5568 | else | |
fbf5a39b | 5569 | I1 := Ind; |
996ae0b0 RK |
5570 | Old_S := It.Nam; |
5571 | end if; | |
5572 | ||
5573 | elsif | |
5574 | Present (First_Formal (It.Nam)) | |
5575 | and then Present (First_Formal (New_S)) | |
5576 | and then (Base_Type (Etype (First_Formal (It.Nam))) | |
5577 | = Base_Type (Etype (First_Formal (New_S)))) | |
5578 | then | |
5579 | Candidate_Renaming := It.Nam; | |
5580 | end if; | |
5581 | ||
fbf5a39b | 5582 | Get_Next_Interp (Ind, It); |
996ae0b0 RK |
5583 | end loop; |
5584 | ||
5585 | Set_Entity (Nam, Old_S); | |
1138cf59 AC |
5586 | |
5587 | if Old_S /= Any_Id then | |
5588 | Set_Is_Overloaded (Nam, False); | |
5589 | end if; | |
996ae0b0 RK |
5590 | end if; |
5591 | ||
5592 | return Old_S; | |
5593 | end Find_Renamed_Entity; | |
5594 | ||
5595 | ----------------------------- | |
5596 | -- Find_Selected_Component -- | |
5597 | ----------------------------- | |
5598 | ||
5599 | procedure Find_Selected_Component (N : Node_Id) is | |
fbf5a39b | 5600 | P : constant Node_Id := Prefix (N); |
996ae0b0 RK |
5601 | |
5602 | P_Name : Entity_Id; | |
5603 | -- Entity denoted by prefix | |
5604 | ||
5605 | P_Type : Entity_Id; | |
5606 | -- and its type | |
5607 | ||
5608 | Nam : Node_Id; | |
5609 | ||
5610 | begin | |
5611 | Analyze (P); | |
5612 | ||
5613 | if Nkind (P) = N_Error then | |
5614 | return; | |
23685ae6 AC |
5615 | end if; |
5616 | ||
5617 | -- Selector name cannot be a character literal or an operator symbol in | |
db72f10a | 5618 | -- SPARK, except for the operator symbol in a renaming. |
23685ae6 | 5619 | |
24558db8 | 5620 | if Restriction_Check_Required (SPARK) then |
23685ae6 | 5621 | if Nkind (Selector_Name (N)) = N_Character_Literal then |
2ba431e5 | 5622 | Check_SPARK_Restriction |
23685ae6 | 5623 | ("character literal cannot be prefixed", N); |
db72f10a AC |
5624 | elsif Nkind (Selector_Name (N)) = N_Operator_Symbol |
5625 | and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration | |
5626 | then | |
2ba431e5 | 5627 | Check_SPARK_Restriction ("operator symbol cannot be prefixed", N); |
23685ae6 AC |
5628 | end if; |
5629 | end if; | |
996ae0b0 | 5630 | |
16ca248a ES |
5631 | -- If the selector already has an entity, the node has been constructed |
5632 | -- in the course of expansion, and is known to be valid. Do not verify | |
5633 | -- that it is defined for the type (it may be a private component used | |
5634 | -- in the expansion of record equality). | |
996ae0b0 | 5635 | |
23685ae6 | 5636 | if Present (Entity (Selector_Name (N))) then |
996ae0b0 RK |
5637 | if No (Etype (N)) |
5638 | or else Etype (N) = Any_Type | |
5639 | then | |
5640 | declare | |
fbf5a39b AC |
5641 | Sel_Name : constant Node_Id := Selector_Name (N); |
5642 | Selector : constant Entity_Id := Entity (Sel_Name); | |
996ae0b0 RK |
5643 | C_Etype : Node_Id; |
5644 | ||
5645 | begin | |
5646 | Set_Etype (Sel_Name, Etype (Selector)); | |
5647 | ||
5648 | if not Is_Entity_Name (P) then | |
fbf5a39b | 5649 | Resolve (P); |
996ae0b0 RK |
5650 | end if; |
5651 | ||
5652 | -- Build an actual subtype except for the first parameter | |
fbf5a39b | 5653 | -- of an init proc, where this actual subtype is by |
996ae0b0 RK |
5654 | -- definition incorrect, since the object is uninitialized |
5655 | -- (and does not even have defined discriminants etc.) | |
5656 | ||
5657 | if Is_Entity_Name (P) | |
5658 | and then Ekind (Entity (P)) = E_Function | |
5659 | then | |
5660 | Nam := New_Copy (P); | |
5661 | ||
5662 | if Is_Overloaded (P) then | |
5663 | Save_Interps (P, Nam); | |
5664 | end if; | |
5665 | ||
5666 | Rewrite (P, | |
5667 | Make_Function_Call (Sloc (P), Name => Nam)); | |
5668 | Analyze_Call (P); | |
5669 | Analyze_Selected_Component (N); | |
5670 | return; | |
5671 | ||
5672 | elsif Ekind (Selector) = E_Component | |
5673 | and then (not Is_Entity_Name (P) | |
5674 | or else Chars (Entity (P)) /= Name_uInit) | |
5675 | then | |
9fc2854d AC |
5676 | -- Do not build the subtype when referencing components of |
5677 | -- dispatch table wrappers. Required to avoid generating | |
df3e68b1 HK |
5678 | -- elaboration code with HI runtimes. JVM and .NET use a |
5679 | -- modified version of Ada.Tags which does not contain RE_ | |
5680 | -- Dispatch_Table_Wrapper and RE_No_Dispatch_Table_Wrapper. | |
5681 | -- Avoid raising RE_Not_Available exception in those cases. | |
9fc2854d | 5682 | |
df3e68b1 HK |
5683 | if VM_Target = No_VM |
5684 | and then RTU_Loaded (Ada_Tags) | |
5685 | and then | |
5686 | ((RTE_Available (RE_Dispatch_Table_Wrapper) | |
2c1b72d7 | 5687 | and then Scope (Selector) = |
df3e68b1 | 5688 | RTE (RE_Dispatch_Table_Wrapper)) |
2c1b72d7 | 5689 | or else |
df3e68b1 | 5690 | (RTE_Available (RE_No_Dispatch_Table_Wrapper) |
2c1b72d7 | 5691 | and then Scope (Selector) = |
df3e68b1 | 5692 | RTE (RE_No_Dispatch_Table_Wrapper))) |
9fc2854d AC |
5693 | then |
5694 | C_Etype := Empty; | |
5695 | ||
5696 | else | |
5697 | C_Etype := | |
2c1b72d7 AC |
5698 | Build_Actual_Subtype_Of_Component |
5699 | (Etype (Selector), N); | |
9fc2854d AC |
5700 | end if; |
5701 | ||
996ae0b0 RK |
5702 | else |
5703 | C_Etype := Empty; | |
5704 | end if; | |
5705 | ||
5706 | if No (C_Etype) then | |
5707 | C_Etype := Etype (Selector); | |
5708 | else | |
5709 | Insert_Action (N, C_Etype); | |
5710 | C_Etype := Defining_Identifier (C_Etype); | |
5711 | end if; | |
5712 | ||
5713 | Set_Etype (N, C_Etype); | |
5714 | end; | |
5715 | ||
5716 | -- If this is the name of an entry or protected operation, and | |
5717 | -- the prefix is an access type, insert an explicit dereference, | |
5718 | -- so that entry calls are treated uniformly. | |
5719 | ||
5720 | if Is_Access_Type (Etype (P)) | |
5721 | and then Is_Concurrent_Type (Designated_Type (Etype (P))) | |
5722 | then | |
5723 | declare | |
fbf5a39b AC |
5724 | New_P : constant Node_Id := |
5725 | Make_Explicit_Dereference (Sloc (P), | |
5726 | Prefix => Relocate_Node (P)); | |
996ae0b0 RK |
5727 | begin |
5728 | Rewrite (P, New_P); | |
5729 | Set_Etype (P, Designated_Type (Etype (Prefix (P)))); | |
5730 | end; | |
5731 | end if; | |
5732 | ||
5733 | -- If the selected component appears within a default expression | |
5734 | -- and it has an actual subtype, the pre-analysis has not yet | |
5735 | -- completed its analysis, because Insert_Actions is disabled in | |
fbf5a39b | 5736 | -- that context. Within the init proc of the enclosing type we |
996ae0b0 RK |
5737 | -- must complete this analysis, if an actual subtype was created. |
5738 | ||
5739 | elsif Inside_Init_Proc then | |
5740 | declare | |
5741 | Typ : constant Entity_Id := Etype (N); | |
5742 | Decl : constant Node_Id := Declaration_Node (Typ); | |
996ae0b0 RK |
5743 | begin |
5744 | if Nkind (Decl) = N_Subtype_Declaration | |
5745 | and then not Analyzed (Decl) | |
5746 | and then Is_List_Member (Decl) | |
5747 | and then No (Parent (Decl)) | |
5748 | then | |
5749 | Remove (Decl); | |
5750 | Insert_Action (N, Decl); | |
5751 | end if; | |
5752 | end; | |
5753 | end if; | |
5754 | ||
5755 | return; | |
5756 | ||
5757 | elsif Is_Entity_Name (P) then | |
5758 | P_Name := Entity (P); | |
5759 | ||
5760 | -- The prefix may denote an enclosing type which is the completion | |
5761 | -- of an incomplete type declaration. | |
5762 | ||
5763 | if Is_Type (P_Name) then | |
5764 | Set_Entity (P, Get_Full_View (P_Name)); | |
5765 | Set_Etype (P, Entity (P)); | |
5766 | P_Name := Entity (P); | |
5767 | end if; | |
5768 | ||
5769 | P_Type := Base_Type (Etype (P)); | |
5770 | ||
5771 | if Debug_Flag_E then | |
5772 | Write_Str ("Found prefix type to be "); | |
5773 | Write_Entity_Info (P_Type, " "); Write_Eol; | |
5774 | end if; | |
5775 | ||
5776 | -- First check for components of a record object (not the | |
5777 | -- result of a call, which is handled below). | |
5778 | ||
5779 | if Is_Appropriate_For_Record (P_Type) | |
5780 | and then not Is_Overloadable (P_Name) | |
5781 | and then not Is_Type (P_Name) | |
5782 | then | |
5783 | -- Selected component of record. Type checking will validate | |
5784 | -- name of selector. | |
11560bcc TQ |
5785 | -- ??? could we rewrite an implicit dereference into an explicit |
5786 | -- one here? | |
996ae0b0 RK |
5787 | |
5788 | Analyze_Selected_Component (N); | |
5789 | ||
f6b5dc8e AC |
5790 | -- Reference to type name in predicate/invariant expression |
5791 | ||
996ae0b0 RK |
5792 | elsif Is_Appropriate_For_Entry_Prefix (P_Type) |
5793 | and then not In_Open_Scopes (P_Name) | |
5794 | and then (not Is_Concurrent_Type (Etype (P_Name)) | |
5795 | or else not In_Open_Scopes (Etype (P_Name))) | |
5796 | then | |
5797 | -- Call to protected operation or entry. Type checking is | |
5798 | -- needed on the prefix. | |
5799 | ||
5800 | Analyze_Selected_Component (N); | |
5801 | ||
5802 | elsif (In_Open_Scopes (P_Name) | |
f6b5dc8e AC |
5803 | and then Ekind (P_Name) /= E_Void |
5804 | and then not Is_Overloadable (P_Name)) | |
996ae0b0 | 5805 | or else (Is_Concurrent_Type (Etype (P_Name)) |
f6b5dc8e | 5806 | and then In_Open_Scopes (Etype (P_Name))) |
996ae0b0 RK |
5807 | then |
5808 | -- Prefix denotes an enclosing loop, block, or task, i.e. an | |
5809 | -- enclosing construct that is not a subprogram or accept. | |
5810 | ||
5811 | Find_Expanded_Name (N); | |
5812 | ||
5813 | elsif Ekind (P_Name) = E_Package then | |
5814 | Find_Expanded_Name (N); | |
5815 | ||
5816 | elsif Is_Overloadable (P_Name) then | |
5817 | ||
5818 | -- The subprogram may be a renaming (of an enclosing scope) as | |
5819 | -- in the case of the name of the generic within an instantiation. | |
5820 | ||
f6b5dc8e | 5821 | if Ekind_In (P_Name, E_Procedure, E_Function) |
996ae0b0 RK |
5822 | and then Present (Alias (P_Name)) |
5823 | and then Is_Generic_Instance (Alias (P_Name)) | |
5824 | then | |
5825 | P_Name := Alias (P_Name); | |
5826 | end if; | |
5827 | ||
5828 | if Is_Overloaded (P) then | |
5829 | ||
bc41faa2 | 5830 | -- The prefix must resolve to a unique enclosing construct |
996ae0b0 RK |
5831 | |
5832 | declare | |
5833 | Found : Boolean := False; | |
fbf5a39b | 5834 | Ind : Interp_Index; |
996ae0b0 RK |
5835 | It : Interp; |
5836 | ||
5837 | begin | |
fbf5a39b | 5838 | Get_First_Interp (P, Ind, It); |
996ae0b0 | 5839 | while Present (It.Nam) loop |
996ae0b0 RK |
5840 | if In_Open_Scopes (It.Nam) then |
5841 | if Found then | |
5842 | Error_Msg_N ( | |
5843 | "prefix must be unique enclosing scope", N); | |
5844 | Set_Entity (N, Any_Id); | |
5845 | Set_Etype (N, Any_Type); | |
5846 | return; | |
5847 | ||
5848 | else | |
5849 | Found := True; | |
5850 | P_Name := It.Nam; | |
5851 | end if; | |
5852 | end if; | |
5853 | ||
fbf5a39b | 5854 | Get_Next_Interp (Ind, It); |
996ae0b0 RK |
5855 | end loop; |
5856 | end; | |
5857 | end if; | |
5858 | ||
5859 | if In_Open_Scopes (P_Name) then | |
5860 | Set_Entity (P, P_Name); | |
5861 | Set_Is_Overloaded (P, False); | |
5862 | Find_Expanded_Name (N); | |
5863 | ||
5864 | else | |
5865 | -- If no interpretation as an expanded name is possible, it | |
5866 | -- must be a selected component of a record returned by a | |
16ca248a ES |
5867 | -- function call. Reformat prefix as a function call, the rest |
5868 | -- is done by type resolution. If the prefix is procedure or | |
5869 | -- entry, as is P.X; this is an error. | |
996ae0b0 RK |
5870 | |
5871 | if Ekind (P_Name) /= E_Function | |
5872 | and then (not Is_Overloaded (P) | |
5873 | or else | |
5874 | Nkind (Parent (N)) = N_Procedure_Call_Statement) | |
5875 | then | |
996ae0b0 | 5876 | -- Prefix may mention a package that is hidden by a local |
290986ed GB |
5877 | -- declaration: let the user know. Scan the full homonym |
5878 | -- chain, the candidate package may be anywhere on it. | |
996ae0b0 | 5879 | |
290986ed GB |
5880 | if Present (Homonym (Current_Entity (P_Name))) then |
5881 | ||
5882 | P_Name := Current_Entity (P_Name); | |
996ae0b0 RK |
5883 | |
5884 | while Present (P_Name) loop | |
5885 | exit when Ekind (P_Name) = E_Package; | |
5886 | P_Name := Homonym (P_Name); | |
5887 | end loop; | |
5888 | ||
5889 | if Present (P_Name) then | |
5890 | Error_Msg_Sloc := Sloc (Entity (Prefix (N))); | |
5891 | ||
5892 | Error_Msg_NE | |
5893 | ("package& is hidden by declaration#", | |
5894 | N, P_Name); | |
5895 | ||
5896 | Set_Entity (Prefix (N), P_Name); | |
5897 | Find_Expanded_Name (N); | |
5898 | return; | |
5899 | else | |
5900 | P_Name := Entity (Prefix (N)); | |
5901 | end if; | |
5902 | end if; | |
5903 | ||
5904 | Error_Msg_NE | |
5905 | ("invalid prefix in selected component&", N, P_Name); | |
5906 | Change_Selected_Component_To_Expanded_Name (N); | |
5907 | Set_Entity (N, Any_Id); | |
5908 | Set_Etype (N, Any_Type); | |
5909 | ||
5910 | else | |
5911 | Nam := New_Copy (P); | |
5912 | Save_Interps (P, Nam); | |
5913 | Rewrite (P, | |
5914 | Make_Function_Call (Sloc (P), Name => Nam)); | |
5915 | Analyze_Call (P); | |
5916 | Analyze_Selected_Component (N); | |
5917 | end if; | |
5918 | end if; | |
5919 | ||
5920 | -- Remaining cases generate various error messages | |
5921 | ||
5922 | else | |
5923 | -- Format node as expanded name, to avoid cascaded errors | |
5924 | ||
fbf5a39b | 5925 | Change_Selected_Component_To_Expanded_Name (N); |
996ae0b0 RK |
5926 | Set_Entity (N, Any_Id); |
5927 | Set_Etype (N, Any_Type); | |
5928 | ||
996ae0b0 RK |
5929 | -- Issue error message, but avoid this if error issued already. |
5930 | -- Use identifier of prefix if one is available. | |
5931 | ||
5932 | if P_Name = Any_Id then | |
5933 | null; | |
5934 | ||
5935 | elsif Ekind (P_Name) = E_Void then | |
5936 | Premature_Usage (P); | |
5937 | ||
5938 | elsif Nkind (P) /= N_Attribute_Reference then | |
5939 | Error_Msg_N ( | |
5940 | "invalid prefix in selected component&", P); | |
5941 | ||
9596236a AC |
5942 | if Is_Access_Type (P_Type) |
5943 | and then Ekind (Designated_Type (P_Type)) = E_Incomplete_Type | |
5944 | then | |
65356e64 AC |
5945 | Error_Msg_N |
5946 | ("\dereference must not be of an incomplete type " & | |
11560bcc | 5947 | "(RM 3.10.1)", P); |
9596236a AC |
5948 | end if; |
5949 | ||
996ae0b0 RK |
5950 | else |
5951 | Error_Msg_N ( | |
5952 | "invalid prefix in selected component", P); | |
5953 | end if; | |
5954 | end if; | |
5955 | ||
db72f10a AC |
5956 | -- Selector name is restricted in SPARK |
5957 | ||
5958 | if Nkind (N) = N_Expanded_Name | |
24558db8 | 5959 | and then Restriction_Check_Required (SPARK) |
db72f10a AC |
5960 | then |
5961 | if Is_Subprogram (P_Name) then | |
2ba431e5 | 5962 | Check_SPARK_Restriction |
db72f10a AC |
5963 | ("prefix of expanded name cannot be a subprogram", P); |
5964 | elsif Ekind (P_Name) = E_Loop then | |
2ba431e5 | 5965 | Check_SPARK_Restriction |
db72f10a AC |
5966 | ("prefix of expanded name cannot be a loop statement", P); |
5967 | end if; | |
5968 | end if; | |
5969 | ||
996ae0b0 RK |
5970 | else |
5971 | -- If prefix is not the name of an entity, it must be an expression, | |
5972 | -- whose type is appropriate for a record. This is determined by | |
5973 | -- type resolution. | |
5974 | ||
5975 | Analyze_Selected_Component (N); | |
5976 | end if; | |
5977 | end Find_Selected_Component; | |
5978 | ||
5979 | --------------- | |
5980 | -- Find_Type -- | |
5981 | --------------- | |
5982 | ||
5983 | procedure Find_Type (N : Node_Id) is | |
5984 | C : Entity_Id; | |
5985 | Typ : Entity_Id; | |
5986 | T : Entity_Id; | |
5987 | T_Name : Entity_Id; | |
5988 | ||
5989 | begin | |
5990 | if N = Error then | |
5991 | return; | |
5992 | ||
5993 | elsif Nkind (N) = N_Attribute_Reference then | |
5994 | ||
11560bcc TQ |
5995 | -- Class attribute. This is not valid in Ada 83 mode, but we do not |
5996 | -- need to enforce that at this point, since the declaration of the | |
5997 | -- tagged type in the prefix would have been flagged already. | |
996ae0b0 RK |
5998 | |
5999 | if Attribute_Name (N) = Name_Class then | |
6000 | Check_Restriction (No_Dispatch, N); | |
6001 | Find_Type (Prefix (N)); | |
6002 | ||
6003 | -- Propagate error from bad prefix | |
6004 | ||
6005 | if Etype (Prefix (N)) = Any_Type then | |
6006 | Set_Entity (N, Any_Type); | |
6007 | Set_Etype (N, Any_Type); | |
6008 | return; | |
6009 | end if; | |
6010 | ||
6011 | T := Base_Type (Entity (Prefix (N))); | |
6012 | ||
11560bcc TQ |
6013 | -- Case where type is not known to be tagged. Its appearance in |
6014 | -- the prefix of the 'Class attribute indicates that the full view | |
16ca248a | 6015 | -- will be tagged. |
996ae0b0 RK |
6016 | |
6017 | if not Is_Tagged_Type (T) then | |
6018 | if Ekind (T) = E_Incomplete_Type then | |
6019 | ||
6020 | -- It is legal to denote the class type of an incomplete | |
6021 | -- type. The full type will have to be tagged, of course. | |
90067a15 | 6022 | -- In Ada 2005 this usage is declared obsolescent, so we |
ae247488 ES |
6023 | -- warn accordingly. This usage is only legal if the type |
6024 | -- is completed in the current scope, and not for a limited | |
6025 | -- view of a type. | |
6026 | ||
6027 | if not Is_Tagged_Type (T) | |
0791fbe9 | 6028 | and then Ada_Version >= Ada_2005 |
ae247488 ES |
6029 | then |
6030 | if From_With_Type (T) then | |
6031 | Error_Msg_N | |
6032 | ("prefix of Class attribute must be tagged", N); | |
6033 | Set_Etype (N, Any_Type); | |
6034 | Set_Entity (N, Any_Type); | |
6035 | return; | |
11560bcc TQ |
6036 | |
6037 | -- ??? This test is temporarily disabled (always False) | |
6038 | -- because it causes an unwanted warning on GNAT sources | |
6039 | -- (built with -gnatg, which includes Warn_On_Obsolescent_ | |
6040 | -- Feature). Once this issue is cleared in the sources, it | |
6041 | -- can be enabled. | |
6042 | ||
ae247488 ES |
6043 | elsif Warn_On_Obsolescent_Feature |
6044 | and then False | |
6045 | then | |
6046 | Error_Msg_N | |
6047 | ("applying 'Class to an untagged incomplete type" | |
6048 | & " is an obsolescent feature (RM J.11)", N); | |
6049 | end if; | |
11560bcc | 6050 | end if; |
996ae0b0 RK |
6051 | |
6052 | Set_Is_Tagged_Type (T); | |
ef2a63ba | 6053 | Set_Direct_Primitive_Operations (T, New_Elmt_List); |
996ae0b0 RK |
6054 | Make_Class_Wide_Type (T); |
6055 | Set_Entity (N, Class_Wide_Type (T)); | |
6056 | Set_Etype (N, Class_Wide_Type (T)); | |
6057 | ||
6058 | elsif Ekind (T) = E_Private_Type | |
6059 | and then not Is_Generic_Type (T) | |
6060 | and then In_Private_Part (Scope (T)) | |
6061 | then | |
16ca248a ES |
6062 | -- The Class attribute can be applied to an untagged private |
6063 | -- type fulfilled by a tagged type prior to the full type | |
6064 | -- declaration (but only within the parent package's private | |
6065 | -- part). Create the class-wide type now and check that the | |
6066 | -- full type is tagged later during its analysis. Note that | |
6067 | -- we do not mark the private type as tagged, unlike the | |
6068 | -- case of incomplete types, because the type must still | |
996ae0b0 RK |
6069 | -- appear untagged to outside units. |
6070 | ||
cdc8c54c | 6071 | if No (Class_Wide_Type (T)) then |
996ae0b0 RK |
6072 | Make_Class_Wide_Type (T); |
6073 | end if; | |
6074 | ||
6075 | Set_Entity (N, Class_Wide_Type (T)); | |
6076 | Set_Etype (N, Class_Wide_Type (T)); | |
6077 | ||
6078 | else | |
16ca248a ES |
6079 | -- Should we introduce a type Any_Tagged and use Wrong_Type |
6080 | -- here, it would be a bit more consistent??? | |
996ae0b0 RK |
6081 | |
6082 | Error_Msg_NE | |
6083 | ("tagged type required, found}", | |
6084 | Prefix (N), First_Subtype (T)); | |
6085 | Set_Entity (N, Any_Type); | |
6086 | return; | |
6087 | end if; | |
6088 | ||
6089 | -- Case of tagged type | |
6090 | ||
6091 | else | |
39edfb45 | 6092 | if Is_Concurrent_Type (T) then |
cdc8c54c BD |
6093 | if No (Corresponding_Record_Type (Entity (Prefix (N)))) then |
6094 | ||
6095 | -- Previous error. Use current type, which at least | |
6096 | -- provides some operations. | |
6097 | ||
6098 | C := Entity (Prefix (N)); | |
6099 | ||
6100 | else | |
6101 | C := Class_Wide_Type | |
6102 | (Corresponding_Record_Type (Entity (Prefix (N)))); | |
6103 | end if; | |
6104 | ||
39edfb45 JM |
6105 | else |
6106 | C := Class_Wide_Type (Entity (Prefix (N))); | |
6107 | end if; | |
6108 | ||
996ae0b0 RK |
6109 | Set_Entity_With_Style_Check (N, C); |
6110 | Generate_Reference (C, N); | |
6111 | Set_Etype (N, C); | |
996ae0b0 RK |
6112 | end if; |
6113 | ||
0ab80019 | 6114 | -- Base attribute, not allowed in Ada 83 |
996ae0b0 RK |
6115 | |
6116 | elsif Attribute_Name (N) = Name_Base then | |
7a489a2b | 6117 | Error_Msg_Name_1 := Name_Base; |
2ba431e5 | 6118 | Check_SPARK_Restriction |
7a489a2b AC |
6119 | ("attribute% is only allowed as prefix of another attribute", N); |
6120 | ||
0ab80019 | 6121 | if Ada_Version = Ada_83 and then Comes_From_Source (N) then |
996ae0b0 RK |
6122 | Error_Msg_N |
6123 | ("(Ada 83) Base attribute not allowed in subtype mark", N); | |
6124 | ||
6125 | else | |
6126 | Find_Type (Prefix (N)); | |
6127 | Typ := Entity (Prefix (N)); | |
6128 | ||
0ab80019 | 6129 | if Ada_Version >= Ada_95 |
fbf5a39b AC |
6130 | and then not Is_Scalar_Type (Typ) |
6131 | and then not Is_Generic_Type (Typ) | |
6132 | then | |
6133 | Error_Msg_N | |
bc41faa2 AC |
6134 | ("prefix of Base attribute must be scalar type", |
6135 | Prefix (N)); | |
fbf5a39b | 6136 | |
a8930b80 | 6137 | elsif Warn_On_Redundant_Constructs |
996ae0b0 | 6138 | and then Base_Type (Typ) = Typ |
996ae0b0 | 6139 | then |
ed2233dc | 6140 | Error_Msg_NE -- CODEFIX |
ad6b5b00 | 6141 | ("?redundant attribute, & is its own base type", N, Typ); |
996ae0b0 RK |
6142 | end if; |
6143 | ||
6144 | T := Base_Type (Typ); | |
996ae0b0 RK |
6145 | |
6146 | -- Rewrite attribute reference with type itself (see similar | |
a8930b80 AC |
6147 | -- processing in Analyze_Attribute, case Base). Preserve prefix |
6148 | -- if present, for other legality checks. | |
fbf5a39b AC |
6149 | |
6150 | if Nkind (Prefix (N)) = N_Expanded_Name then | |
6151 | Rewrite (N, | |
6152 | Make_Expanded_Name (Sloc (N), | |
11560bcc TQ |
6153 | Chars => Chars (T), |
6154 | Prefix => New_Copy (Prefix (Prefix (N))), | |
6155 | Selector_Name => New_Reference_To (T, Sloc (N)))); | |
996ae0b0 | 6156 | |
fbf5a39b | 6157 | else |
11560bcc | 6158 | Rewrite (N, New_Reference_To (T, Sloc (N))); |
fbf5a39b AC |
6159 | end if; |
6160 | ||
6161 | Set_Entity (N, T); | |
996ae0b0 RK |
6162 | Set_Etype (N, T); |
6163 | end if; | |
6164 | ||
923fa078 RD |
6165 | elsif Attribute_Name (N) = Name_Stub_Type then |
6166 | ||
6167 | -- This is handled in Analyze_Attribute | |
6168 | ||
6169 | Analyze (N); | |
6170 | ||
996ae0b0 RK |
6171 | -- All other attributes are invalid in a subtype mark |
6172 | ||
6173 | else | |
6174 | Error_Msg_N ("invalid attribute in subtype mark", N); | |
6175 | end if; | |
6176 | ||
6177 | else | |
6178 | Analyze (N); | |
6179 | ||
6180 | if Is_Entity_Name (N) then | |
6181 | T_Name := Entity (N); | |
6182 | else | |
6183 | Error_Msg_N ("subtype mark required in this context", N); | |
6184 | Set_Etype (N, Any_Type); | |
6185 | return; | |
6186 | end if; | |
6187 | ||
6188 | if T_Name = Any_Id or else Etype (N) = Any_Type then | |
6189 | ||
6190 | -- Undefined id. Make it into a valid type | |
6191 | ||
6192 | Set_Entity (N, Any_Type); | |
6193 | ||
6194 | elsif not Is_Type (T_Name) | |
6195 | and then T_Name /= Standard_Void_Type | |
6196 | then | |
6197 | Error_Msg_Sloc := Sloc (T_Name); | |
6198 | Error_Msg_N ("subtype mark required in this context", N); | |
923fa078 | 6199 | Error_Msg_NE ("\\found & declared#", N, T_Name); |
996ae0b0 RK |
6200 | Set_Entity (N, Any_Type); |
6201 | ||
6202 | else | |
11560bcc TQ |
6203 | -- If the type is an incomplete type created to handle |
6204 | -- anonymous access components of a record type, then the | |
6205 | -- incomplete type is the visible entity and subsequent | |
6206 | -- references will point to it. Mark the original full | |
6207 | -- type as referenced, to prevent spurious warnings. | |
6208 | ||
6209 | if Is_Incomplete_Type (T_Name) | |
6210 | and then Present (Full_View (T_Name)) | |
6211 | and then not Comes_From_Source (T_Name) | |
6212 | then | |
6213 | Set_Referenced (Full_View (T_Name)); | |
6214 | end if; | |
6215 | ||
996ae0b0 RK |
6216 | T_Name := Get_Full_View (T_Name); |
6217 | ||
11560bcc TQ |
6218 | -- Ada 2005 (AI-251, AI-50217): Handle interfaces visible through |
6219 | -- limited-with clauses | |
6220 | ||
6221 | if From_With_Type (T_Name) | |
6222 | and then Ekind (T_Name) in Incomplete_Kind | |
6223 | and then Present (Non_Limited_View (T_Name)) | |
6224 | and then Is_Interface (Non_Limited_View (T_Name)) | |
6225 | then | |
6226 | T_Name := Non_Limited_View (T_Name); | |
6227 | end if; | |
6228 | ||
996ae0b0 RK |
6229 | if In_Open_Scopes (T_Name) then |
6230 | if Ekind (Base_Type (T_Name)) = E_Task_Type then | |
923fa078 RD |
6231 | |
6232 | -- In Ada 2005, a task name can be used in an access | |
e264efcc AC |
6233 | -- definition within its own body. It cannot be used |
6234 | -- in the discriminant part of the task declaration, | |
6235 | -- nor anywhere else in the declaration because entries | |
6236 | -- cannot have access parameters. | |
923fa078 | 6237 | |
0791fbe9 | 6238 | if Ada_Version >= Ada_2005 |
923fa078 RD |
6239 | and then Nkind (Parent (N)) = N_Access_Definition |
6240 | then | |
6241 | Set_Entity (N, T_Name); | |
6242 | Set_Etype (N, T_Name); | |
e264efcc AC |
6243 | |
6244 | if Has_Completion (T_Name) then | |
6245 | return; | |
6246 | ||
6247 | else | |
6248 | Error_Msg_N | |
6249 | ("task type cannot be used as type mark " & | |
6250 | "within its own declaration", N); | |
6251 | end if; | |
923fa078 RD |
6252 | |
6253 | else | |
6254 | Error_Msg_N | |
6255 | ("task type cannot be used as type mark " & | |
fbe627af | 6256 | "within its own spec or body", N); |
923fa078 | 6257 | end if; |
fbe627af RD |
6258 | |
6259 | elsif Ekind (Base_Type (T_Name)) = E_Protected_Type then | |
6260 | ||
6261 | -- In Ada 2005, a protected name can be used in an access | |
6262 | -- definition within its own body. | |
6263 | ||
0791fbe9 | 6264 | if Ada_Version >= Ada_2005 |
fbe627af RD |
6265 | and then Nkind (Parent (N)) = N_Access_Definition |
6266 | then | |
6267 | Set_Entity (N, T_Name); | |
6268 | Set_Etype (N, T_Name); | |
6269 | return; | |
6270 | ||
6271 | else | |
6272 | Error_Msg_N | |
6273 | ("protected type cannot be used as type mark " & | |
6274 | "within its own spec or body", N); | |
6275 | end if; | |
6276 | ||
996ae0b0 RK |
6277 | else |
6278 | Error_Msg_N ("type declaration cannot refer to itself", N); | |
6279 | end if; | |
6280 | ||
6281 | Set_Etype (N, Any_Type); | |
6282 | Set_Entity (N, Any_Type); | |
6283 | Set_Error_Posted (T_Name); | |
6284 | return; | |
6285 | end if; | |
6286 | ||
6287 | Set_Entity (N, T_Name); | |
6288 | Set_Etype (N, T_Name); | |
6289 | end if; | |
6290 | end if; | |
6291 | ||
07fc65c4 | 6292 | if Present (Etype (N)) and then Comes_From_Source (N) then |
996ae0b0 RK |
6293 | if Is_Fixed_Point_Type (Etype (N)) then |
6294 | Check_Restriction (No_Fixed_Point, N); | |
6295 | elsif Is_Floating_Point_Type (Etype (N)) then | |
6296 | Check_Restriction (No_Floating_Point, N); | |
6297 | end if; | |
6298 | end if; | |
6299 | end Find_Type; | |
6300 | ||
996ae0b0 RK |
6301 | ------------------------------------ |
6302 | -- Has_Implicit_Character_Literal -- | |
6303 | ------------------------------------ | |
6304 | ||
6305 | function Has_Implicit_Character_Literal (N : Node_Id) return Boolean is | |
6306 | Id : Entity_Id; | |
6307 | Found : Boolean := False; | |
6308 | P : constant Entity_Id := Entity (Prefix (N)); | |
6309 | Priv_Id : Entity_Id := Empty; | |
6310 | ||
6311 | begin | |
6312 | if Ekind (P) = E_Package | |
6313 | and then not In_Open_Scopes (P) | |
6314 | then | |
6315 | Priv_Id := First_Private_Entity (P); | |
6316 | end if; | |
6317 | ||
6318 | if P = Standard_Standard then | |
6319 | Change_Selected_Component_To_Expanded_Name (N); | |
6320 | Rewrite (N, Selector_Name (N)); | |
6321 | Analyze (N); | |
6322 | Set_Etype (Original_Node (N), Standard_Character); | |
6323 | return True; | |
6324 | end if; | |
6325 | ||
6326 | Id := First_Entity (P); | |
996ae0b0 RK |
6327 | while Present (Id) |
6328 | and then Id /= Priv_Id | |
6329 | loop | |
d347f572 AC |
6330 | if Is_Standard_Character_Type (Id) and then Is_Base_Type (Id) then |
6331 | ||
996ae0b0 RK |
6332 | -- We replace the node with the literal itself, resolve as a |
6333 | -- character, and set the type correctly. | |
6334 | ||
6335 | if not Found then | |
6336 | Change_Selected_Component_To_Expanded_Name (N); | |
6337 | Rewrite (N, Selector_Name (N)); | |
6338 | Analyze (N); | |
6339 | Set_Etype (N, Id); | |
6340 | Set_Etype (Original_Node (N), Id); | |
6341 | Found := True; | |
6342 | ||
6343 | else | |
6344 | -- More than one type derived from Character in given scope. | |
6345 | -- Collect all possible interpretations. | |
6346 | ||
6347 | Add_One_Interp (N, Id, Id); | |
6348 | end if; | |
6349 | end if; | |
6350 | ||
6351 | Next_Entity (Id); | |
6352 | end loop; | |
6353 | ||
6354 | return Found; | |
6355 | end Has_Implicit_Character_Literal; | |
6356 | ||
9bc856dd AC |
6357 | ---------------------- |
6358 | -- Has_Private_With -- | |
6359 | ---------------------- | |
6360 | ||
6361 | function Has_Private_With (E : Entity_Id) return Boolean is | |
6362 | Comp_Unit : constant Node_Id := Cunit (Current_Sem_Unit); | |
6363 | Item : Node_Id; | |
6364 | ||
6365 | begin | |
6366 | Item := First (Context_Items (Comp_Unit)); | |
6367 | while Present (Item) loop | |
6368 | if Nkind (Item) = N_With_Clause | |
6369 | and then Private_Present (Item) | |
6370 | and then Entity (Name (Item)) = E | |
6371 | then | |
6372 | return True; | |
6373 | end if; | |
6374 | ||
6375 | Next (Item); | |
6376 | end loop; | |
6377 | ||
6378 | return False; | |
6379 | end Has_Private_With; | |
6380 | ||
996ae0b0 RK |
6381 | --------------------------- |
6382 | -- Has_Implicit_Operator -- | |
6383 | --------------------------- | |
6384 | ||
6385 | function Has_Implicit_Operator (N : Node_Id) return Boolean is | |
6386 | Op_Id : constant Name_Id := Chars (Selector_Name (N)); | |
6387 | P : constant Entity_Id := Entity (Prefix (N)); | |
6388 | Id : Entity_Id; | |
6389 | Priv_Id : Entity_Id := Empty; | |
6390 | ||
fbf5a39b AC |
6391 | procedure Add_Implicit_Operator |
6392 | (T : Entity_Id; | |
6393 | Op_Type : Entity_Id := Empty); | |
fbe627af RD |
6394 | -- Add implicit interpretation to node N, using the type for which a |
6395 | -- predefined operator exists. If the operator yields a boolean type, | |
6396 | -- the Operand_Type is implicitly referenced by the operator, and a | |
6397 | -- reference to it must be generated. | |
996ae0b0 RK |
6398 | |
6399 | --------------------------- | |
6400 | -- Add_Implicit_Operator -- | |
6401 | --------------------------- | |
6402 | ||
fbf5a39b AC |
6403 | procedure Add_Implicit_Operator |
6404 | (T : Entity_Id; | |
6405 | Op_Type : Entity_Id := Empty) | |
6406 | is | |
996ae0b0 RK |
6407 | Predef_Op : Entity_Id; |
6408 | ||
6409 | begin | |
6410 | Predef_Op := Current_Entity (Selector_Name (N)); | |
6411 | ||
6412 | while Present (Predef_Op) | |
6413 | and then Scope (Predef_Op) /= Standard_Standard | |
6414 | loop | |
6415 | Predef_Op := Homonym (Predef_Op); | |
6416 | end loop; | |
6417 | ||
6418 | if Nkind (N) = N_Selected_Component then | |
6419 | Change_Selected_Component_To_Expanded_Name (N); | |
6420 | end if; | |
6421 | ||
719aaf4d AC |
6422 | -- If the context is an unanalyzed function call, determine whether |
6423 | -- a binary or unary interpretation is required. | |
996ae0b0 | 6424 | |
719aaf4d AC |
6425 | if Nkind (Parent (N)) = N_Indexed_Component then |
6426 | declare | |
964f13da RD |
6427 | Is_Binary_Call : constant Boolean := |
6428 | Present | |
6429 | (Next (First (Expressions (Parent (N))))); | |
6430 | Is_Binary_Op : constant Boolean := | |
6431 | First_Entity | |
6432 | (Predef_Op) /= Last_Entity (Predef_Op); | |
719aaf4d AC |
6433 | Predef_Op2 : constant Entity_Id := Homonym (Predef_Op); |
6434 | ||
6435 | begin | |
6436 | if Is_Binary_Call then | |
6437 | if Is_Binary_Op then | |
6438 | Add_One_Interp (N, Predef_Op, T); | |
6439 | else | |
6440 | Add_One_Interp (N, Predef_Op2, T); | |
6441 | end if; | |
996ae0b0 | 6442 | |
719aaf4d AC |
6443 | else |
6444 | if not Is_Binary_Op then | |
6445 | Add_One_Interp (N, Predef_Op, T); | |
6446 | else | |
6447 | Add_One_Interp (N, Predef_Op2, T); | |
6448 | end if; | |
6449 | end if; | |
6450 | end; | |
6451 | ||
6452 | else | |
6453 | Add_One_Interp (N, Predef_Op, T); | |
6454 | ||
6455 | -- For operators with unary and binary interpretations, if | |
6456 | -- context is not a call, add both | |
6457 | ||
6458 | if Present (Homonym (Predef_Op)) then | |
6459 | Add_One_Interp (N, Homonym (Predef_Op), T); | |
6460 | end if; | |
996ae0b0 | 6461 | end if; |
fbf5a39b AC |
6462 | |
6463 | -- The node is a reference to a predefined operator, and | |
6464 | -- an implicit reference to the type of its operands. | |
6465 | ||
6466 | if Present (Op_Type) then | |
6467 | Generate_Operator_Reference (N, Op_Type); | |
6468 | else | |
6469 | Generate_Operator_Reference (N, T); | |
6470 | end if; | |
996ae0b0 RK |
6471 | end Add_Implicit_Operator; |
6472 | ||
6473 | -- Start of processing for Has_Implicit_Operator | |
6474 | ||
6475 | begin | |
996ae0b0 RK |
6476 | if Ekind (P) = E_Package |
6477 | and then not In_Open_Scopes (P) | |
6478 | then | |
6479 | Priv_Id := First_Private_Entity (P); | |
6480 | end if; | |
6481 | ||
6482 | Id := First_Entity (P); | |
6483 | ||
6484 | case Op_Id is | |
6485 | ||
6486 | -- Boolean operators: an implicit declaration exists if the scope | |
6487 | -- contains a declaration for a derived Boolean type, or for an | |
6488 | -- array of Boolean type. | |
6489 | ||
6490 | when Name_Op_And | Name_Op_Not | Name_Op_Or | Name_Op_Xor => | |
996ae0b0 | 6491 | while Id /= Priv_Id loop |
d347f572 | 6492 | if Valid_Boolean_Arg (Id) and then Is_Base_Type (Id) then |
996ae0b0 RK |
6493 | Add_Implicit_Operator (Id); |
6494 | return True; | |
6495 | end if; | |
6496 | ||
6497 | Next_Entity (Id); | |
6498 | end loop; | |
6499 | ||
bc41faa2 | 6500 | -- Equality: look for any non-limited type (result is Boolean) |
996ae0b0 RK |
6501 | |
6502 | when Name_Op_Eq | Name_Op_Ne => | |
996ae0b0 | 6503 | while Id /= Priv_Id loop |
996ae0b0 RK |
6504 | if Is_Type (Id) |
6505 | and then not Is_Limited_Type (Id) | |
d347f572 | 6506 | and then Is_Base_Type (Id) |
996ae0b0 | 6507 | then |
fbf5a39b | 6508 | Add_Implicit_Operator (Standard_Boolean, Id); |
996ae0b0 RK |
6509 | return True; |
6510 | end if; | |
6511 | ||
6512 | Next_Entity (Id); | |
6513 | end loop; | |
6514 | ||
bc41faa2 | 6515 | -- Comparison operators: scalar type, or array of scalar |
996ae0b0 RK |
6516 | |
6517 | when Name_Op_Lt | Name_Op_Le | Name_Op_Gt | Name_Op_Ge => | |
996ae0b0 RK |
6518 | while Id /= Priv_Id loop |
6519 | if (Is_Scalar_Type (Id) | |
d347f572 AC |
6520 | or else (Is_Array_Type (Id) |
6521 | and then Is_Scalar_Type (Component_Type (Id)))) | |
6522 | and then Is_Base_Type (Id) | |
996ae0b0 | 6523 | then |
fbf5a39b | 6524 | Add_Implicit_Operator (Standard_Boolean, Id); |
996ae0b0 RK |
6525 | return True; |
6526 | end if; | |
6527 | ||
6528 | Next_Entity (Id); | |
6529 | end loop; | |
6530 | ||
6531 | -- Arithmetic operators: any numeric type | |
6532 | ||
6533 | when Name_Op_Abs | | |
6534 | Name_Op_Add | | |
6535 | Name_Op_Mod | | |
6536 | Name_Op_Rem | | |
6537 | Name_Op_Subtract | | |
6538 | Name_Op_Multiply | | |
6539 | Name_Op_Divide | | |
6540 | Name_Op_Expon => | |
996ae0b0 | 6541 | while Id /= Priv_Id loop |
d347f572 | 6542 | if Is_Numeric_Type (Id) and then Is_Base_Type (Id) then |
996ae0b0 RK |
6543 | Add_Implicit_Operator (Id); |
6544 | return True; | |
6545 | end if; | |
6546 | ||
6547 | Next_Entity (Id); | |
6548 | end loop; | |
6549 | ||
6550 | -- Concatenation: any one-dimensional array type | |
6551 | ||
6552 | when Name_Op_Concat => | |
996ae0b0 | 6553 | while Id /= Priv_Id loop |
d347f572 AC |
6554 | if Is_Array_Type (Id) |
6555 | and then Number_Dimensions (Id) = 1 | |
6556 | and then Is_Base_Type (Id) | |
996ae0b0 RK |
6557 | then |
6558 | Add_Implicit_Operator (Id); | |
6559 | return True; | |
6560 | end if; | |
6561 | ||
6562 | Next_Entity (Id); | |
6563 | end loop; | |
6564 | ||
6565 | -- What is the others condition here? Should we be using a | |
6566 | -- subtype of Name_Id that would restrict to operators ??? | |
6567 | ||
6568 | when others => null; | |
996ae0b0 RK |
6569 | end case; |
6570 | ||
6571 | -- If we fall through, then we do not have an implicit operator | |
6572 | ||
6573 | return False; | |
6574 | ||
6575 | end Has_Implicit_Operator; | |
6576 | ||
607d0635 AC |
6577 | ----------------------------------- |
6578 | -- Has_Loop_In_Inner_Open_Scopes -- | |
6579 | ----------------------------------- | |
6580 | ||
6581 | function Has_Loop_In_Inner_Open_Scopes (S : Entity_Id) return Boolean is | |
6582 | begin | |
6583 | -- Several scope stacks are maintained by Scope_Stack. The base of the | |
6584 | -- currently active scope stack is denoted by the Is_Active_Stack_Base | |
6585 | -- flag in the scope stack entry. Note that the scope stacks used to | |
6586 | -- simply be delimited implicitly by the presence of Standard_Standard | |
6587 | -- at their base, but there now are cases where this is not sufficient | |
6588 | -- because Standard_Standard actually may appear in the middle of the | |
6589 | -- active set of scopes. | |
6590 | ||
6591 | for J in reverse 0 .. Scope_Stack.Last loop | |
8d606a78 RD |
6592 | |
6593 | -- S was reached without seing a loop scope first | |
6594 | ||
607d0635 | 6595 | if Scope_Stack.Table (J).Entity = S then |
607d0635 | 6596 | return False; |
8d606a78 RD |
6597 | |
6598 | -- S was not yet reached, so it contains at least one inner loop | |
6599 | ||
607d0635 | 6600 | elsif Ekind (Scope_Stack.Table (J).Entity) = E_Loop then |
607d0635 AC |
6601 | return True; |
6602 | end if; | |
6603 | ||
6604 | -- Check Is_Active_Stack_Base to tell us when to stop, as there are | |
6605 | -- cases where Standard_Standard appears in the middle of the active | |
6606 | -- set of scopes. This affects the declaration and overriding of | |
6607 | -- private inherited operations in instantiations of generic child | |
6608 | -- units. | |
6609 | ||
6610 | pragma Assert (not Scope_Stack.Table (J).Is_Active_Stack_Base); | |
6611 | end loop; | |
6612 | ||
2010d078 | 6613 | raise Program_Error; -- unreachable |
607d0635 AC |
6614 | end Has_Loop_In_Inner_Open_Scopes; |
6615 | ||
996ae0b0 RK |
6616 | -------------------- |
6617 | -- In_Open_Scopes -- | |
6618 | -------------------- | |
6619 | ||
6620 | function In_Open_Scopes (S : Entity_Id) return Boolean is | |
6621 | begin | |
923fa078 RD |
6622 | -- Several scope stacks are maintained by Scope_Stack. The base of the |
6623 | -- currently active scope stack is denoted by the Is_Active_Stack_Base | |
6624 | -- flag in the scope stack entry. Note that the scope stacks used to | |
6625 | -- simply be delimited implicitly by the presence of Standard_Standard | |
6626 | -- at their base, but there now are cases where this is not sufficient | |
6627 | -- because Standard_Standard actually may appear in the middle of the | |
6628 | -- active set of scopes. | |
996ae0b0 RK |
6629 | |
6630 | for J in reverse 0 .. Scope_Stack.Last loop | |
6631 | if Scope_Stack.Table (J).Entity = S then | |
6632 | return True; | |
6633 | end if; | |
6634 | ||
923fa078 RD |
6635 | -- Check Is_Active_Stack_Base to tell us when to stop, as there are |
6636 | -- cases where Standard_Standard appears in the middle of the active | |
6637 | -- set of scopes. This affects the declaration and overriding of | |
6638 | -- private inherited operations in instantiations of generic child | |
6639 | -- units. | |
996ae0b0 RK |
6640 | |
6641 | exit when Scope_Stack.Table (J).Is_Active_Stack_Base; | |
6642 | end loop; | |
6643 | ||
6644 | return False; | |
6645 | end In_Open_Scopes; | |
6646 | ||
6647 | ----------------------------- | |
6648 | -- Inherit_Renamed_Profile -- | |
6649 | ----------------------------- | |
6650 | ||
6651 | procedure Inherit_Renamed_Profile (New_S : Entity_Id; Old_S : Entity_Id) is | |
6652 | New_F : Entity_Id; | |
6653 | Old_F : Entity_Id; | |
6654 | Old_T : Entity_Id; | |
6655 | New_T : Entity_Id; | |
6656 | ||
6657 | begin | |
6658 | if Ekind (Old_S) = E_Operator then | |
996ae0b0 RK |
6659 | New_F := First_Formal (New_S); |
6660 | ||
6661 | while Present (New_F) loop | |
6662 | Set_Etype (New_F, Base_Type (Etype (New_F))); | |
6663 | Next_Formal (New_F); | |
6664 | end loop; | |
6665 | ||
6666 | Set_Etype (New_S, Base_Type (Etype (New_S))); | |
6667 | ||
6668 | else | |
6669 | New_F := First_Formal (New_S); | |
6670 | Old_F := First_Formal (Old_S); | |
6671 | ||
6672 | while Present (New_F) loop | |
6673 | New_T := Etype (New_F); | |
6674 | Old_T := Etype (Old_F); | |
6675 | ||
6676 | -- If the new type is a renaming of the old one, as is the | |
6677 | -- case for actuals in instances, retain its name, to simplify | |
6678 | -- later disambiguation. | |
6679 | ||
6680 | if Nkind (Parent (New_T)) = N_Subtype_Declaration | |
6681 | and then Is_Entity_Name (Subtype_Indication (Parent (New_T))) | |
6682 | and then Entity (Subtype_Indication (Parent (New_T))) = Old_T | |
6683 | then | |
6684 | null; | |
6685 | else | |
6686 | Set_Etype (New_F, Old_T); | |
6687 | end if; | |
6688 | ||
6689 | Next_Formal (New_F); | |
6690 | Next_Formal (Old_F); | |
6691 | end loop; | |
6692 | ||
bce79204 | 6693 | if Ekind_In (Old_S, E_Function, E_Enumeration_Literal) then |
996ae0b0 RK |
6694 | Set_Etype (New_S, Etype (Old_S)); |
6695 | end if; | |
6696 | end if; | |
6697 | end Inherit_Renamed_Profile; | |
6698 | ||
6699 | ---------------- | |
6700 | -- Initialize -- | |
6701 | ---------------- | |
6702 | ||
6703 | procedure Initialize is | |
6704 | begin | |
6705 | Urefs.Init; | |
6706 | end Initialize; | |
6707 | ||
6708 | ------------------------- | |
6709 | -- Install_Use_Clauses -- | |
6710 | ------------------------- | |
6711 | ||
0da2c8ac AC |
6712 | procedure Install_Use_Clauses |
6713 | (Clause : Node_Id; | |
6714 | Force_Installation : Boolean := False) | |
6715 | is | |
16ca248a | 6716 | U : Node_Id; |
996ae0b0 RK |
6717 | P : Node_Id; |
6718 | Id : Entity_Id; | |
6719 | ||
6720 | begin | |
16ca248a | 6721 | U := Clause; |
996ae0b0 RK |
6722 | while Present (U) loop |
6723 | ||
6724 | -- Case of USE package | |
6725 | ||
6726 | if Nkind (U) = N_Use_Package_Clause then | |
6727 | P := First (Names (U)); | |
996ae0b0 RK |
6728 | while Present (P) loop |
6729 | Id := Entity (P); | |
6730 | ||
6731 | if Ekind (Id) = E_Package then | |
996ae0b0 | 6732 | if In_Use (Id) then |
d4810530 | 6733 | Note_Redundant_Use (P); |
996ae0b0 RK |
6734 | |
6735 | elsif Present (Renamed_Object (Id)) | |
6736 | and then In_Use (Renamed_Object (Id)) | |
6737 | then | |
d4810530 | 6738 | Note_Redundant_Use (P); |
996ae0b0 | 6739 | |
0da2c8ac | 6740 | elsif Force_Installation or else Applicable_Use (P) then |
996ae0b0 | 6741 | Use_One_Package (Id, U); |
0da2c8ac | 6742 | |
996ae0b0 RK |
6743 | end if; |
6744 | end if; | |
6745 | ||
6746 | Next (P); | |
6747 | end loop; | |
6748 | ||
16ca248a | 6749 | -- Case of USE TYPE |
996ae0b0 RK |
6750 | |
6751 | else | |
6752 | P := First (Subtype_Marks (U)); | |
996ae0b0 | 6753 | while Present (P) loop |
fbf5a39b AC |
6754 | if not Is_Entity_Name (P) |
6755 | or else No (Entity (P)) | |
6756 | then | |
6757 | null; | |
996ae0b0 | 6758 | |
fbf5a39b | 6759 | elsif Entity (P) /= Any_Type then |
07fc65c4 | 6760 | Use_One_Type (P); |
996ae0b0 RK |
6761 | end if; |
6762 | ||
6763 | Next (P); | |
6764 | end loop; | |
6765 | end if; | |
6766 | ||
6767 | Next_Use_Clause (U); | |
6768 | end loop; | |
6769 | end Install_Use_Clauses; | |
6770 | ||
6771 | ------------------------------------- | |
6772 | -- Is_Appropriate_For_Entry_Prefix -- | |
6773 | ------------------------------------- | |
6774 | ||
6775 | function Is_Appropriate_For_Entry_Prefix (T : Entity_Id) return Boolean is | |
6776 | P_Type : Entity_Id := T; | |
6777 | ||
6778 | begin | |
6779 | if Is_Access_Type (P_Type) then | |
6780 | P_Type := Designated_Type (P_Type); | |
6781 | end if; | |
6782 | ||
6783 | return Is_Task_Type (P_Type) or else Is_Protected_Type (P_Type); | |
6784 | end Is_Appropriate_For_Entry_Prefix; | |
6785 | ||
6786 | ------------------------------- | |
6787 | -- Is_Appropriate_For_Record -- | |
6788 | ------------------------------- | |
6789 | ||
2e071734 AC |
6790 | function Is_Appropriate_For_Record (T : Entity_Id) return Boolean is |
6791 | ||
996ae0b0 RK |
6792 | function Has_Components (T1 : Entity_Id) return Boolean; |
6793 | -- Determine if given type has components (i.e. is either a record | |
6794 | -- type or a type that has discriminants). | |
6795 | ||
16ca248a ES |
6796 | -------------------- |
6797 | -- Has_Components -- | |
6798 | -------------------- | |
6799 | ||
996ae0b0 RK |
6800 | function Has_Components (T1 : Entity_Id) return Boolean is |
6801 | begin | |
6802 | return Is_Record_Type (T1) | |
6803 | or else (Is_Private_Type (T1) and then Has_Discriminants (T1)) | |
16ca248a ES |
6804 | or else (Is_Task_Type (T1) and then Has_Discriminants (T1)) |
6805 | or else (Is_Incomplete_Type (T1) | |
6806 | and then From_With_Type (T1) | |
6807 | and then Present (Non_Limited_View (T1)) | |
11560bcc TQ |
6808 | and then Is_Record_Type |
6809 | (Get_Full_View (Non_Limited_View (T1)))); | |
996ae0b0 RK |
6810 | end Has_Components; |
6811 | ||
6812 | -- Start of processing for Is_Appropriate_For_Record | |
6813 | ||
6814 | begin | |
6815 | return | |
6816 | Present (T) | |
6817 | and then (Has_Components (T) | |
16ca248a ES |
6818 | or else (Is_Access_Type (T) |
6819 | and then Has_Components (Designated_Type (T)))); | |
996ae0b0 RK |
6820 | end Is_Appropriate_For_Record; |
6821 | ||
d4810530 ES |
6822 | ------------------------ |
6823 | -- Note_Redundant_Use -- | |
6824 | ------------------------ | |
6825 | ||
6826 | procedure Note_Redundant_Use (Clause : Node_Id) is | |
6827 | Pack_Name : constant Entity_Id := Entity (Clause); | |
6828 | Cur_Use : constant Node_Id := Current_Use_Clause (Pack_Name); | |
6829 | Decl : constant Node_Id := Parent (Clause); | |
6830 | ||
6831 | Prev_Use : Node_Id := Empty; | |
6832 | Redundant : Node_Id := Empty; | |
f7ca1d04 AC |
6833 | -- The Use_Clause which is actually redundant. In the simplest case it |
6834 | -- is Pack itself, but when we compile a body we install its context | |
6835 | -- before that of its spec, in which case it is the use_clause in the | |
6836 | -- spec that will appear to be redundant, and we want the warning to be | |
6837 | -- placed on the body. Similar complications appear when the redundancy | |
6838 | -- is between a child unit and one of its ancestors. | |
d4810530 ES |
6839 | |
6840 | begin | |
6841 | Set_Redundant_Use (Clause, True); | |
6842 | ||
6843 | if not Comes_From_Source (Clause) | |
6844 | or else In_Instance | |
6845 | or else not Warn_On_Redundant_Constructs | |
6846 | then | |
6847 | return; | |
6848 | end if; | |
6849 | ||
6850 | if not Is_Compilation_Unit (Current_Scope) then | |
6851 | ||
f7ca1d04 AC |
6852 | -- If the use_clause is in an inner scope, it is made redundant by |
6853 | -- some clause in the current context, with one exception: If we're | |
6854 | -- compiling a nested package body, and the use_clause comes from the | |
6855 | -- corresponding spec, the clause is not necessarily fully redundant, | |
6856 | -- so we should not warn. If a warning was warranted, it would have | |
6857 | -- been given when the spec was processed. | |
cdc8c54c BD |
6858 | |
6859 | if Nkind (Parent (Decl)) = N_Package_Specification then | |
6860 | declare | |
6861 | Package_Spec_Entity : constant Entity_Id := | |
6862 | Defining_Unit_Name (Parent (Decl)); | |
6863 | begin | |
6864 | if In_Package_Body (Package_Spec_Entity) then | |
6865 | return; | |
6866 | end if; | |
6867 | end; | |
6868 | end if; | |
d4810530 ES |
6869 | |
6870 | Redundant := Clause; | |
6871 | Prev_Use := Cur_Use; | |
6872 | ||
6873 | elsif Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body then | |
6874 | declare | |
6875 | Cur_Unit : constant Unit_Number_Type := Get_Source_Unit (Cur_Use); | |
6876 | New_Unit : constant Unit_Number_Type := Get_Source_Unit (Clause); | |
6877 | Scop : Entity_Id; | |
6878 | ||
6879 | begin | |
6880 | if Cur_Unit = New_Unit then | |
6881 | ||
6882 | -- Redundant clause in same body | |
6883 | ||
6884 | Redundant := Clause; | |
6885 | Prev_Use := Cur_Use; | |
6886 | ||
6887 | elsif Cur_Unit = Current_Sem_Unit then | |
6888 | ||
6889 | -- If the new clause is not in the current unit it has been | |
6890 | -- analyzed first, and it makes the other one redundant. | |
6891 | -- However, if the new clause appears in a subunit, Cur_Unit | |
6892 | -- is still the parent, and in that case the redundant one | |
6893 | -- is the one appearing in the subunit. | |
6894 | ||
6895 | if Nkind (Unit (Cunit (New_Unit))) = N_Subunit then | |
6896 | Redundant := Clause; | |
6897 | Prev_Use := Cur_Use; | |
6898 | ||
6899 | -- Most common case: redundant clause in body, | |
6900 | -- original clause in spec. Current scope is spec entity. | |
6901 | ||
6902 | elsif | |
6903 | Current_Scope = | |
6904 | Defining_Entity ( | |
6905 | Unit (Library_Unit (Cunit (Current_Sem_Unit)))) | |
6906 | then | |
6907 | Redundant := Cur_Use; | |
6908 | Prev_Use := Clause; | |
6909 | ||
6910 | else | |
6911 | -- The new clause may appear in an unrelated unit, when | |
6912 | -- the parents of a generic are being installed prior to | |
6913 | -- instantiation. In this case there must be no warning. | |
6914 | -- We detect this case by checking whether the current top | |
6915 | -- of the stack is related to the current compilation. | |
6916 | ||
6917 | Scop := Current_Scope; | |
6918 | while Present (Scop) | |
6919 | and then Scop /= Standard_Standard | |
6920 | loop | |
6921 | if Is_Compilation_Unit (Scop) | |
6922 | and then not Is_Child_Unit (Scop) | |
6923 | then | |
6924 | return; | |
6925 | ||
6926 | elsif Scop = Cunit_Entity (Current_Sem_Unit) then | |
6927 | exit; | |
6928 | end if; | |
6929 | ||
6930 | Scop := Scope (Scop); | |
6931 | end loop; | |
6932 | ||
6933 | Redundant := Cur_Use; | |
6934 | Prev_Use := Clause; | |
6935 | end if; | |
6936 | ||
6937 | elsif New_Unit = Current_Sem_Unit then | |
6938 | Redundant := Clause; | |
6939 | Prev_Use := Cur_Use; | |
6940 | ||
6941 | else | |
6942 | -- Neither is the current unit, so they appear in parent or | |
6943 | -- sibling units. Warning will be emitted elsewhere. | |
6944 | ||
6945 | return; | |
6946 | end if; | |
6947 | end; | |
6948 | ||
6949 | elsif Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Declaration | |
6950 | and then Present (Parent_Spec (Unit (Cunit (Current_Sem_Unit)))) | |
6951 | then | |
f7ca1d04 AC |
6952 | -- Use_clause is in child unit of current unit, and the child unit |
6953 | -- appears in the context of the body of the parent, so it has been | |
6954 | -- installed first, even though it is the redundant one. Depending on | |
6955 | -- their placement in the context, the visible or the private parts | |
6956 | -- of the two units, either might appear as redundant, but the | |
6957 | -- message has to be on the current unit. | |
d4810530 ES |
6958 | |
6959 | if Get_Source_Unit (Cur_Use) = Current_Sem_Unit then | |
6960 | Redundant := Cur_Use; | |
6961 | Prev_Use := Clause; | |
6962 | else | |
6963 | Redundant := Clause; | |
6964 | Prev_Use := Cur_Use; | |
6965 | end if; | |
6966 | ||
6967 | -- If the new use clause appears in the private part of a parent unit | |
f3d57416 | 6968 | -- it may appear to be redundant w.r.t. a use clause in a child unit, |
d4810530 ES |
6969 | -- but the previous use clause was needed in the visible part of the |
6970 | -- child, and no warning should be emitted. | |
6971 | ||
6972 | if Nkind (Parent (Decl)) = N_Package_Specification | |
6973 | and then | |
6974 | List_Containing (Decl) = Private_Declarations (Parent (Decl)) | |
6975 | then | |
6976 | declare | |
6977 | Par : constant Entity_Id := Defining_Entity (Parent (Decl)); | |
6978 | Spec : constant Node_Id := | |
6979 | Specification (Unit (Cunit (Current_Sem_Unit))); | |
6980 | ||
6981 | begin | |
6982 | if Is_Compilation_Unit (Par) | |
6983 | and then Par /= Cunit_Entity (Current_Sem_Unit) | |
6984 | and then Parent (Cur_Use) = Spec | |
6985 | and then | |
6986 | List_Containing (Cur_Use) = Visible_Declarations (Spec) | |
6987 | then | |
6988 | return; | |
6989 | end if; | |
6990 | end; | |
6991 | end if; | |
6992 | ||
ff81221b ES |
6993 | -- Finally, if the current use clause is in the context then |
6994 | -- the clause is redundant when it is nested within the unit. | |
6995 | ||
6996 | elsif Nkind (Parent (Cur_Use)) = N_Compilation_Unit | |
6997 | and then Nkind (Parent (Parent (Clause))) /= N_Compilation_Unit | |
6998 | and then Get_Source_Unit (Cur_Use) = Get_Source_Unit (Clause) | |
6999 | then | |
7000 | Redundant := Clause; | |
7001 | Prev_Use := Cur_Use; | |
7002 | ||
d4810530 ES |
7003 | else |
7004 | null; | |
7005 | end if; | |
7006 | ||
7007 | if Present (Redundant) then | |
7008 | Error_Msg_Sloc := Sloc (Prev_Use); | |
ed2233dc | 7009 | Error_Msg_NE -- CODEFIX |
954c111a HK |
7010 | ("& is already use-visible through previous use clause #?", |
7011 | Redundant, Pack_Name); | |
d4810530 ES |
7012 | end if; |
7013 | end Note_Redundant_Use; | |
7014 | ||
996ae0b0 RK |
7015 | --------------- |
7016 | -- Pop_Scope -- | |
7017 | --------------- | |
7018 | ||
7019 | procedure Pop_Scope is | |
fbf5a39b | 7020 | SST : Scope_Stack_Entry renames Scope_Stack.Table (Scope_Stack.Last); |
fab2daeb | 7021 | S : constant Entity_Id := SST.Entity; |
996ae0b0 RK |
7022 | |
7023 | begin | |
7024 | if Debug_Flag_E then | |
7025 | Write_Info; | |
7026 | end if; | |
7027 | ||
fab2daeb AC |
7028 | -- Set Default_Storage_Pool field of the library unit if necessary |
7029 | ||
7030 | if Ekind_In (S, E_Package, E_Generic_Package) | |
7031 | and then | |
7032 | Nkind (Parent (Unit_Declaration_Node (S))) = N_Compilation_Unit | |
7033 | then | |
7034 | declare | |
7035 | Aux : constant Node_Id := | |
4adf3c50 | 7036 | Aux_Decls_Node (Parent (Unit_Declaration_Node (S))); |
fab2daeb AC |
7037 | begin |
7038 | if No (Default_Storage_Pool (Aux)) then | |
7039 | Set_Default_Storage_Pool (Aux, Default_Pool); | |
7040 | end if; | |
7041 | end; | |
7042 | end if; | |
7043 | ||
21d27997 | 7044 | Scope_Suppress := SST.Save_Scope_Suppress; |
11560bcc | 7045 | Local_Suppress_Stack_Top := SST.Save_Local_Suppress_Stack_Top; |
21d27997 | 7046 | Check_Policy_List := SST.Save_Check_Policy_List; |
fab2daeb | 7047 | Default_Pool := SST.Save_Default_Storage_Pool; |
996ae0b0 RK |
7048 | |
7049 | if Debug_Flag_W then | |
fab2daeb | 7050 | Write_Str ("<-- exiting scope: "); |
996ae0b0 RK |
7051 | Write_Name (Chars (Current_Scope)); |
7052 | Write_Str (", Depth="); | |
7053 | Write_Int (Int (Scope_Stack.Last)); | |
7054 | Write_Eol; | |
7055 | end if; | |
7056 | ||
fbf5a39b | 7057 | End_Use_Clauses (SST.First_Use_Clause); |
996ae0b0 RK |
7058 | |
7059 | -- If the actions to be wrapped are still there they will get lost | |
7060 | -- causing incomplete code to be generated. It is better to abort in | |
fbf5a39b AC |
7061 | -- this case (and we do the abort even with assertions off since the |
7062 | -- penalty is incorrect code generation) | |
996ae0b0 | 7063 | |
fbf5a39b AC |
7064 | if SST.Actions_To_Be_Wrapped_Before /= No_List |
7065 | or else | |
7066 | SST.Actions_To_Be_Wrapped_After /= No_List | |
7067 | then | |
46202729 | 7068 | raise Program_Error; |
fbf5a39b | 7069 | end if; |
996ae0b0 RK |
7070 | |
7071 | -- Free last subprogram name if allocated, and pop scope | |
7072 | ||
fbf5a39b | 7073 | Free (SST.Last_Subprogram_Name); |
996ae0b0 RK |
7074 | Scope_Stack.Decrement_Last; |
7075 | end Pop_Scope; | |
7076 | ||
fbe627af RD |
7077 | --------------- |
7078 | -- Push_Scope -- | |
7079 | --------------- | |
7080 | ||
7081 | procedure Push_Scope (S : Entity_Id) is | |
fab2daeb | 7082 | E : constant Entity_Id := Scope (S); |
fbe627af RD |
7083 | |
7084 | begin | |
7085 | if Ekind (S) = E_Void then | |
7086 | null; | |
7087 | ||
f7ca1d04 AC |
7088 | -- Set scope depth if not a non-concurrent type, and we have not yet set |
7089 | -- the scope depth. This means that we have the first occurrence of the | |
7090 | -- scope, and this is where the depth is set. | |
fbe627af RD |
7091 | |
7092 | elsif (not Is_Type (S) or else Is_Concurrent_Type (S)) | |
7093 | and then not Scope_Depth_Set (S) | |
7094 | then | |
7095 | if S = Standard_Standard then | |
7096 | Set_Scope_Depth_Value (S, Uint_0); | |
7097 | ||
7098 | elsif Is_Child_Unit (S) then | |
7099 | Set_Scope_Depth_Value (S, Uint_1); | |
7100 | ||
7101 | elsif not Is_Record_Type (Current_Scope) then | |
7102 | if Ekind (S) = E_Loop then | |
7103 | Set_Scope_Depth_Value (S, Scope_Depth (Current_Scope)); | |
7104 | else | |
7105 | Set_Scope_Depth_Value (S, Scope_Depth (Current_Scope) + 1); | |
7106 | end if; | |
7107 | end if; | |
7108 | end if; | |
7109 | ||
7110 | Scope_Stack.Increment_Last; | |
7111 | ||
7112 | declare | |
7113 | SST : Scope_Stack_Entry renames Scope_Stack.Table (Scope_Stack.Last); | |
7114 | ||
7115 | begin | |
11560bcc TQ |
7116 | SST.Entity := S; |
7117 | SST.Save_Scope_Suppress := Scope_Suppress; | |
7118 | SST.Save_Local_Suppress_Stack_Top := Local_Suppress_Stack_Top; | |
21d27997 | 7119 | SST.Save_Check_Policy_List := Check_Policy_List; |
fab2daeb | 7120 | SST.Save_Default_Storage_Pool := Default_Pool; |
fbe627af RD |
7121 | |
7122 | if Scope_Stack.Last > Scope_Stack.First then | |
7123 | SST.Component_Alignment_Default := Scope_Stack.Table | |
7124 | (Scope_Stack.Last - 1). | |
7125 | Component_Alignment_Default; | |
7126 | end if; | |
7127 | ||
7128 | SST.Last_Subprogram_Name := null; | |
7129 | SST.Is_Transient := False; | |
7130 | SST.Node_To_Be_Wrapped := Empty; | |
7131 | SST.Pending_Freeze_Actions := No_List; | |
7132 | SST.Actions_To_Be_Wrapped_Before := No_List; | |
7133 | SST.Actions_To_Be_Wrapped_After := No_List; | |
7134 | SST.First_Use_Clause := Empty; | |
7135 | SST.Is_Active_Stack_Base := False; | |
7136 | SST.Previous_Visibility := False; | |
7137 | end; | |
7138 | ||
7139 | if Debug_Flag_W then | |
7140 | Write_Str ("--> new scope: "); | |
7141 | Write_Name (Chars (Current_Scope)); | |
7142 | Write_Str (", Id="); | |
7143 | Write_Int (Int (Current_Scope)); | |
7144 | Write_Str (", Depth="); | |
7145 | Write_Int (Int (Scope_Stack.Last)); | |
7146 | Write_Eol; | |
7147 | end if; | |
7148 | ||
f7ca1d04 AC |
7149 | -- Deal with copying flags from the previous scope to this one. This is |
7150 | -- not necessary if either scope is standard, or if the new scope is a | |
7151 | -- child unit. | |
fbe627af RD |
7152 | |
7153 | if S /= Standard_Standard | |
7154 | and then Scope (S) /= Standard_Standard | |
7155 | and then not Is_Child_Unit (S) | |
7156 | then | |
fbe627af RD |
7157 | if Nkind (E) not in N_Entity then |
7158 | return; | |
7159 | end if; | |
7160 | ||
7161 | -- Copy categorization flags from Scope (S) to S, this is not done | |
7162 | -- when Scope (S) is Standard_Standard since propagation is from | |
7163 | -- library unit entity inwards. Copy other relevant attributes as | |
7164 | -- well (Discard_Names in particular). | |
7165 | ||
7166 | -- We only propagate inwards for library level entities, | |
7167 | -- inner level subprograms do not inherit the categorization. | |
7168 | ||
7169 | if Is_Library_Level_Entity (S) then | |
7170 | Set_Is_Preelaborated (S, Is_Preelaborated (E)); | |
7171 | Set_Is_Shared_Passive (S, Is_Shared_Passive (E)); | |
7172 | Set_Discard_Names (S, Discard_Names (E)); | |
7173 | Set_Suppress_Value_Tracking_On_Call | |
7174 | (S, Suppress_Value_Tracking_On_Call (E)); | |
7175 | Set_Categorization_From_Scope (E => S, Scop => E); | |
7176 | end if; | |
7177 | end if; | |
fab2daeb AC |
7178 | |
7179 | if Is_Child_Unit (S) | |
7180 | and then Present (E) | |
7181 | and then Ekind_In (E, E_Package, E_Generic_Package) | |
7182 | and then | |
7183 | Nkind (Parent (Unit_Declaration_Node (E))) = N_Compilation_Unit | |
7184 | then | |
7185 | declare | |
7186 | Aux : constant Node_Id := | |
4adf3c50 | 7187 | Aux_Decls_Node (Parent (Unit_Declaration_Node (E))); |
fab2daeb AC |
7188 | begin |
7189 | if Present (Default_Storage_Pool (Aux)) then | |
7190 | Default_Pool := Default_Storage_Pool (Aux); | |
7191 | end if; | |
7192 | end; | |
7193 | end if; | |
fbe627af RD |
7194 | end Push_Scope; |
7195 | ||
996ae0b0 RK |
7196 | --------------------- |
7197 | -- Premature_Usage -- | |
7198 | --------------------- | |
7199 | ||
7200 | procedure Premature_Usage (N : Node_Id) is | |
fbf5a39b | 7201 | Kind : constant Node_Kind := Nkind (Parent (Entity (N))); |
996ae0b0 RK |
7202 | E : Entity_Id := Entity (N); |
7203 | ||
7204 | begin | |
7205 | -- Within an instance, the analysis of the actual for a formal object | |
16ca248a ES |
7206 | -- does not see the name of the object itself. This is significant only |
7207 | -- if the object is an aggregate, where its analysis does not do any | |
7208 | -- name resolution on component associations. (see 4717-008). In such a | |
7209 | -- case, look for the visible homonym on the chain. | |
996ae0b0 RK |
7210 | |
7211 | if In_Instance | |
7212 | and then Present (Homonym (E)) | |
7213 | then | |
7214 | E := Homonym (E); | |
7215 | ||
7216 | while Present (E) | |
7217 | and then not In_Open_Scopes (Scope (E)) | |
7218 | loop | |
7219 | E := Homonym (E); | |
7220 | end loop; | |
7221 | ||
7222 | if Present (E) then | |
7223 | Set_Entity (N, E); | |
7224 | Set_Etype (N, Etype (E)); | |
7225 | return; | |
7226 | end if; | |
7227 | end if; | |
7228 | ||
7229 | if Kind = N_Component_Declaration then | |
7230 | Error_Msg_N | |
7231 | ("component&! cannot be used before end of record declaration", N); | |
7232 | ||
7233 | elsif Kind = N_Parameter_Specification then | |
7234 | Error_Msg_N | |
7235 | ("formal parameter&! cannot be used before end of specification", | |
7236 | N); | |
7237 | ||
7238 | elsif Kind = N_Discriminant_Specification then | |
7239 | Error_Msg_N | |
7240 | ("discriminant&! cannot be used before end of discriminant part", | |
7241 | N); | |
7242 | ||
7243 | elsif Kind = N_Procedure_Specification | |
7244 | or else Kind = N_Function_Specification | |
7245 | then | |
7246 | Error_Msg_N | |
7247 | ("subprogram&! cannot be used before end of its declaration", | |
7248 | N); | |
90067a15 ES |
7249 | |
7250 | elsif Kind = N_Full_Type_Declaration then | |
7251 | Error_Msg_N | |
7252 | ("type& cannot be used before end of its declaration!", N); | |
7253 | ||
996ae0b0 RK |
7254 | else |
7255 | Error_Msg_N | |
7256 | ("object& cannot be used before end of its declaration!", N); | |
7257 | end if; | |
7258 | end Premature_Usage; | |
7259 | ||
7260 | ------------------------ | |
7261 | -- Present_System_Aux -- | |
7262 | ------------------------ | |
7263 | ||
7264 | function Present_System_Aux (N : Node_Id := Empty) return Boolean is | |
7265 | Loc : Source_Ptr; | |
fbe627af | 7266 | Aux_Name : Unit_Name_Type; |
996ae0b0 RK |
7267 | Unum : Unit_Number_Type; |
7268 | Withn : Node_Id; | |
7269 | With_Sys : Node_Id; | |
7270 | The_Unit : Node_Id; | |
7271 | ||
7272 | function Find_System (C_Unit : Node_Id) return Entity_Id; | |
16ca248a | 7273 | -- Scan context clause of compilation unit to find with_clause |
996ae0b0 RK |
7274 | -- for System. |
7275 | ||
2e071734 AC |
7276 | ----------------- |
7277 | -- Find_System -- | |
7278 | ----------------- | |
7279 | ||
996ae0b0 RK |
7280 | function Find_System (C_Unit : Node_Id) return Entity_Id is |
7281 | With_Clause : Node_Id; | |
7282 | ||
7283 | begin | |
7284 | With_Clause := First (Context_Items (C_Unit)); | |
996ae0b0 RK |
7285 | while Present (With_Clause) loop |
7286 | if (Nkind (With_Clause) = N_With_Clause | |
7287 | and then Chars (Name (With_Clause)) = Name_System) | |
7288 | and then Comes_From_Source (With_Clause) | |
7289 | then | |
7290 | return With_Clause; | |
7291 | end if; | |
7292 | ||
7293 | Next (With_Clause); | |
7294 | end loop; | |
7295 | ||
7296 | return Empty; | |
7297 | end Find_System; | |
7298 | ||
7299 | -- Start of processing for Present_System_Aux | |
7300 | ||
7301 | begin | |
bc41faa2 | 7302 | -- The child unit may have been loaded and analyzed already |
996ae0b0 RK |
7303 | |
7304 | if Present (System_Aux_Id) then | |
7305 | return True; | |
7306 | ||
7307 | -- If no previous pragma for System.Aux, nothing to load | |
7308 | ||
fbf5a39b | 7309 | elsif No (System_Extend_Unit) then |
996ae0b0 RK |
7310 | return False; |
7311 | ||
7312 | -- Use the unit name given in the pragma to retrieve the unit. | |
7313 | -- Verify that System itself appears in the context clause of the | |
7314 | -- current compilation. If System is not present, an error will | |
7315 | -- have been reported already. | |
7316 | ||
7317 | else | |
7318 | With_Sys := Find_System (Cunit (Current_Sem_Unit)); | |
7319 | ||
7320 | The_Unit := Unit (Cunit (Current_Sem_Unit)); | |
7321 | ||
7322 | if No (With_Sys) | |
294ccb21 RD |
7323 | and then |
7324 | (Nkind (The_Unit) = N_Package_Body | |
7325 | or else (Nkind (The_Unit) = N_Subprogram_Body | |
7326 | and then | |
7327 | not Acts_As_Spec (Cunit (Current_Sem_Unit)))) | |
996ae0b0 RK |
7328 | then |
7329 | With_Sys := Find_System (Library_Unit (Cunit (Current_Sem_Unit))); | |
7330 | end if; | |
7331 | ||
7332 | if No (With_Sys) | |
7333 | and then Present (N) | |
7334 | then | |
7335 | -- If we are compiling a subunit, we need to examine its | |
7336 | -- context as well (Current_Sem_Unit is the parent unit); | |
7337 | ||
7338 | The_Unit := Parent (N); | |
996ae0b0 RK |
7339 | while Nkind (The_Unit) /= N_Compilation_Unit loop |
7340 | The_Unit := Parent (The_Unit); | |
7341 | end loop; | |
7342 | ||
7343 | if Nkind (Unit (The_Unit)) = N_Subunit then | |
7344 | With_Sys := Find_System (The_Unit); | |
7345 | end if; | |
7346 | end if; | |
7347 | ||
7348 | if No (With_Sys) then | |
7349 | return False; | |
7350 | end if; | |
7351 | ||
7352 | Loc := Sloc (With_Sys); | |
fbf5a39b | 7353 | Get_Name_String (Chars (Expression (System_Extend_Unit))); |
996ae0b0 RK |
7354 | Name_Buffer (8 .. Name_Len + 7) := Name_Buffer (1 .. Name_Len); |
7355 | Name_Buffer (1 .. 7) := "system."; | |
7356 | Name_Buffer (Name_Len + 8) := '%'; | |
7357 | Name_Buffer (Name_Len + 9) := 's'; | |
7358 | Name_Len := Name_Len + 9; | |
7359 | Aux_Name := Name_Find; | |
7360 | ||
7361 | Unum := | |
7362 | Load_Unit | |
7363 | (Load_Name => Aux_Name, | |
7364 | Required => False, | |
7365 | Subunit => False, | |
7366 | Error_Node => With_Sys); | |
7367 | ||
7368 | if Unum /= No_Unit then | |
7369 | Semantics (Cunit (Unum)); | |
7370 | System_Aux_Id := | |
7371 | Defining_Entity (Specification (Unit (Cunit (Unum)))); | |
7372 | ||
16ca248a ES |
7373 | Withn := |
7374 | Make_With_Clause (Loc, | |
7375 | Name => | |
7376 | Make_Expanded_Name (Loc, | |
7377 | Chars => Chars (System_Aux_Id), | |
7378 | Prefix => New_Reference_To (Scope (System_Aux_Id), Loc), | |
7379 | Selector_Name => New_Reference_To (System_Aux_Id, Loc))); | |
996ae0b0 RK |
7380 | |
7381 | Set_Entity (Name (Withn), System_Aux_Id); | |
7382 | ||
16ca248a ES |
7383 | Set_Library_Unit (Withn, Cunit (Unum)); |
7384 | Set_Corresponding_Spec (Withn, System_Aux_Id); | |
7385 | Set_First_Name (Withn, True); | |
7386 | Set_Implicit_With (Withn, True); | |
996ae0b0 RK |
7387 | |
7388 | Insert_After (With_Sys, Withn); | |
7389 | Mark_Rewrite_Insertion (Withn); | |
7390 | Set_Context_Installed (Withn); | |
7391 | ||
7392 | return True; | |
7393 | ||
7394 | -- Here if unit load failed | |
7395 | ||
7396 | else | |
7397 | Error_Msg_Name_1 := Name_System; | |
fbf5a39b | 7398 | Error_Msg_Name_2 := Chars (Expression (System_Extend_Unit)); |
996ae0b0 RK |
7399 | Error_Msg_N |
7400 | ("extension package `%.%` does not exist", | |
fbf5a39b | 7401 | Opt.System_Extend_Unit); |
996ae0b0 RK |
7402 | return False; |
7403 | end if; | |
7404 | end if; | |
7405 | end Present_System_Aux; | |
7406 | ||
7407 | ------------------------- | |
7408 | -- Restore_Scope_Stack -- | |
7409 | ------------------------- | |
7410 | ||
ecad994d | 7411 | procedure Restore_Scope_Stack (Handle_Use : Boolean := True) is |
996ae0b0 RK |
7412 | E : Entity_Id; |
7413 | S : Entity_Id; | |
7414 | Comp_Unit : Node_Id; | |
7415 | In_Child : Boolean := False; | |
7416 | Full_Vis : Boolean := True; | |
fbf5a39b | 7417 | SS_Last : constant Int := Scope_Stack.Last; |
996ae0b0 RK |
7418 | |
7419 | begin | |
bc41faa2 | 7420 | -- Restore visibility of previous scope stack, if any |
996ae0b0 RK |
7421 | |
7422 | for J in reverse 0 .. Scope_Stack.Last loop | |
7423 | exit when Scope_Stack.Table (J).Entity = Standard_Standard | |
7424 | or else No (Scope_Stack.Table (J).Entity); | |
7425 | ||
7426 | S := Scope_Stack.Table (J).Entity; | |
7427 | ||
7428 | if not Is_Hidden_Open_Scope (S) then | |
7429 | ||
7430 | -- If the parent scope is hidden, its entities are hidden as | |
7431 | -- well, unless the entity is the instantiation currently | |
7432 | -- being analyzed. | |
7433 | ||
7434 | if not Is_Hidden_Open_Scope (Scope (S)) | |
7435 | or else not Analyzed (Parent (S)) | |
7436 | or else Scope (S) = Standard_Standard | |
7437 | then | |
7438 | Set_Is_Immediately_Visible (S, True); | |
7439 | end if; | |
7440 | ||
7441 | E := First_Entity (S); | |
996ae0b0 RK |
7442 | while Present (E) loop |
7443 | if Is_Child_Unit (E) then | |
a523b302 JM |
7444 | if not From_With_Type (E) then |
7445 | Set_Is_Immediately_Visible (E, | |
7446 | Is_Visible_Child_Unit (E) or else In_Open_Scopes (E)); | |
f7ca1d04 | 7447 | |
a523b302 JM |
7448 | else |
7449 | pragma Assert | |
7450 | (Nkind (Parent (E)) = N_Defining_Program_Unit_Name | |
7451 | and then | |
7452 | Nkind (Parent (Parent (E))) = N_Package_Specification); | |
7453 | Set_Is_Immediately_Visible (E, | |
7454 | Limited_View_Installed (Parent (Parent (E)))); | |
7455 | end if; | |
996ae0b0 RK |
7456 | else |
7457 | Set_Is_Immediately_Visible (E, True); | |
7458 | end if; | |
7459 | ||
7460 | Next_Entity (E); | |
7461 | ||
8dbd1460 AC |
7462 | if not Full_Vis |
7463 | and then Is_Package_Or_Generic_Package (S) | |
7464 | then | |
7465 | -- We are in the visible part of the package scope | |
7466 | ||
996ae0b0 RK |
7467 | exit when E = First_Private_Entity (S); |
7468 | end if; | |
7469 | end loop; | |
7470 | ||
7471 | -- The visibility of child units (siblings of current compilation) | |
7472 | -- must be restored in any case. Their declarations may appear | |
7473 | -- after the private part of the parent. | |
7474 | ||
16ca248a | 7475 | if not Full_Vis then |
996ae0b0 RK |
7476 | while Present (E) loop |
7477 | if Is_Child_Unit (E) then | |
7478 | Set_Is_Immediately_Visible (E, | |
7479 | Is_Visible_Child_Unit (E) or else In_Open_Scopes (E)); | |
7480 | end if; | |
7481 | ||
7482 | Next_Entity (E); | |
7483 | end loop; | |
7484 | end if; | |
7485 | end if; | |
7486 | ||
7487 | if Is_Child_Unit (S) | |
fbe627af | 7488 | and not In_Child -- check only for current unit |
996ae0b0 RK |
7489 | then |
7490 | In_Child := True; | |
7491 | ||
fbe627af | 7492 | -- Restore visibility of parents according to whether the child |
996ae0b0 RK |
7493 | -- is private and whether we are in its visible part. |
7494 | ||
7495 | Comp_Unit := Parent (Unit_Declaration_Node (S)); | |
7496 | ||
7497 | if Nkind (Comp_Unit) = N_Compilation_Unit | |
7498 | and then Private_Present (Comp_Unit) | |
7499 | then | |
7500 | Full_Vis := True; | |
7501 | ||
b9b2405f | 7502 | elsif Is_Package_Or_Generic_Package (S) |
d7ba4df4 | 7503 | and then (In_Private_Part (S) or else In_Package_Body (S)) |
996ae0b0 RK |
7504 | then |
7505 | Full_Vis := True; | |
7506 | ||
7d823354 ES |
7507 | -- if S is the scope of some instance (which has already been |
7508 | -- seen on the stack) it does not affect the visibility of | |
7509 | -- other scopes. | |
7510 | ||
7511 | elsif Is_Hidden_Open_Scope (S) then | |
7512 | null; | |
7513 | ||
996ae0b0 RK |
7514 | elsif (Ekind (S) = E_Procedure |
7515 | or else Ekind (S) = E_Function) | |
7516 | and then Has_Completion (S) | |
7517 | then | |
7518 | Full_Vis := True; | |
7519 | else | |
7520 | Full_Vis := False; | |
7521 | end if; | |
7522 | else | |
7523 | Full_Vis := True; | |
7524 | end if; | |
7525 | end loop; | |
fbf5a39b AC |
7526 | |
7527 | if SS_Last >= Scope_Stack.First | |
7528 | and then Scope_Stack.Table (SS_Last).Entity /= Standard_Standard | |
ecad994d | 7529 | and then Handle_Use |
fbf5a39b AC |
7530 | then |
7531 | Install_Use_Clauses (Scope_Stack.Table (SS_Last).First_Use_Clause); | |
7532 | end if; | |
996ae0b0 RK |
7533 | end Restore_Scope_Stack; |
7534 | ||
7535 | ---------------------- | |
7536 | -- Save_Scope_Stack -- | |
7537 | ---------------------- | |
7538 | ||
ecad994d | 7539 | procedure Save_Scope_Stack (Handle_Use : Boolean := True) is |
996ae0b0 RK |
7540 | E : Entity_Id; |
7541 | S : Entity_Id; | |
7542 | SS_Last : constant Int := Scope_Stack.Last; | |
7543 | ||
7544 | begin | |
7545 | if SS_Last >= Scope_Stack.First | |
7546 | and then Scope_Stack.Table (SS_Last).Entity /= Standard_Standard | |
7547 | then | |
ecad994d AC |
7548 | if Handle_Use then |
7549 | End_Use_Clauses (Scope_Stack.Table (SS_Last).First_Use_Clause); | |
7550 | end if; | |
fbf5a39b | 7551 | |
16ca248a ES |
7552 | -- If the call is from within a compilation unit, as when called from |
7553 | -- Rtsfind, make current entries in scope stack invisible while we | |
7554 | -- analyze the new unit. | |
996ae0b0 RK |
7555 | |
7556 | for J in reverse 0 .. SS_Last loop | |
7557 | exit when Scope_Stack.Table (J).Entity = Standard_Standard | |
7558 | or else No (Scope_Stack.Table (J).Entity); | |
7559 | ||
7560 | S := Scope_Stack.Table (J).Entity; | |
7561 | Set_Is_Immediately_Visible (S, False); | |
996ae0b0 | 7562 | |
16ca248a | 7563 | E := First_Entity (S); |
996ae0b0 RK |
7564 | while Present (E) loop |
7565 | Set_Is_Immediately_Visible (E, False); | |
7566 | Next_Entity (E); | |
7567 | end loop; | |
7568 | end loop; | |
7569 | ||
7570 | end if; | |
7571 | end Save_Scope_Stack; | |
7572 | ||
7573 | ------------- | |
7574 | -- Set_Use -- | |
7575 | ------------- | |
7576 | ||
7577 | procedure Set_Use (L : List_Id) is | |
7578 | Decl : Node_Id; | |
7579 | Pack_Name : Node_Id; | |
7580 | Pack : Entity_Id; | |
7581 | Id : Entity_Id; | |
7582 | ||
7583 | begin | |
7584 | if Present (L) then | |
7585 | Decl := First (L); | |
996ae0b0 RK |
7586 | while Present (Decl) loop |
7587 | if Nkind (Decl) = N_Use_Package_Clause then | |
7588 | Chain_Use_Clause (Decl); | |
996ae0b0 | 7589 | |
16ca248a | 7590 | Pack_Name := First (Names (Decl)); |
996ae0b0 RK |
7591 | while Present (Pack_Name) loop |
7592 | Pack := Entity (Pack_Name); | |
7593 | ||
7594 | if Ekind (Pack) = E_Package | |
7595 | and then Applicable_Use (Pack_Name) | |
7596 | then | |
7597 | Use_One_Package (Pack, Decl); | |
7598 | end if; | |
7599 | ||
7600 | Next (Pack_Name); | |
7601 | end loop; | |
7602 | ||
7603 | elsif Nkind (Decl) = N_Use_Type_Clause then | |
7604 | Chain_Use_Clause (Decl); | |
996ae0b0 | 7605 | |
16ca248a | 7606 | Id := First (Subtype_Marks (Decl)); |
996ae0b0 RK |
7607 | while Present (Id) loop |
7608 | if Entity (Id) /= Any_Type then | |
07fc65c4 | 7609 | Use_One_Type (Id); |
996ae0b0 RK |
7610 | end if; |
7611 | ||
7612 | Next (Id); | |
7613 | end loop; | |
7614 | end if; | |
7615 | ||
7616 | Next (Decl); | |
7617 | end loop; | |
7618 | end if; | |
7619 | end Set_Use; | |
7620 | ||
7621 | --------------------- | |
7622 | -- Use_One_Package -- | |
7623 | --------------------- | |
7624 | ||
7625 | procedure Use_One_Package (P : Entity_Id; N : Node_Id) is | |
7626 | Id : Entity_Id; | |
7627 | Prev : Entity_Id; | |
7628 | Current_Instance : Entity_Id := Empty; | |
7629 | Real_P : Entity_Id; | |
9bc856dd | 7630 | Private_With_OK : Boolean := False; |
996ae0b0 RK |
7631 | |
7632 | begin | |
7633 | if Ekind (P) /= E_Package then | |
7634 | return; | |
7635 | end if; | |
7636 | ||
7637 | Set_In_Use (P); | |
d4810530 | 7638 | Set_Current_Use_Clause (P, N); |
996ae0b0 | 7639 | |
0ab80019 | 7640 | -- Ada 2005 (AI-50217): Check restriction |
19f0526a | 7641 | |
996ae0b0 | 7642 | if From_With_Type (P) then |
657a9dd9 | 7643 | Error_Msg_N ("limited withed package cannot appear in use clause", N); |
996ae0b0 RK |
7644 | end if; |
7645 | ||
bc41faa2 | 7646 | -- Find enclosing instance, if any |
996ae0b0 RK |
7647 | |
7648 | if In_Instance then | |
7649 | Current_Instance := Current_Scope; | |
996ae0b0 RK |
7650 | while not Is_Generic_Instance (Current_Instance) loop |
7651 | Current_Instance := Scope (Current_Instance); | |
7652 | end loop; | |
7653 | ||
7654 | if No (Hidden_By_Use_Clause (N)) then | |
7655 | Set_Hidden_By_Use_Clause (N, New_Elmt_List); | |
7656 | end if; | |
7657 | end if; | |
7658 | ||
7659 | -- If unit is a package renaming, indicate that the renamed | |
7660 | -- package is also in use (the flags on both entities must | |
7661 | -- remain consistent, and a subsequent use of either of them | |
7662 | -- should be recognized as redundant). | |
7663 | ||
7664 | if Present (Renamed_Object (P)) then | |
7665 | Set_In_Use (Renamed_Object (P)); | |
d4810530 | 7666 | Set_Current_Use_Clause (Renamed_Object (P), N); |
996ae0b0 RK |
7667 | Real_P := Renamed_Object (P); |
7668 | else | |
7669 | Real_P := P; | |
7670 | end if; | |
7671 | ||
0ab80019 | 7672 | -- Ada 2005 (AI-262): Check the use_clause of a private withed package |
9bc856dd AC |
7673 | -- found in the private part of a package specification |
7674 | ||
7675 | if In_Private_Part (Current_Scope) | |
7676 | and then Has_Private_With (P) | |
7677 | and then Is_Child_Unit (Current_Scope) | |
7678 | and then Is_Child_Unit (P) | |
7679 | and then Is_Ancestor_Package (Scope (Current_Scope), P) | |
7680 | then | |
7681 | Private_With_OK := True; | |
7682 | end if; | |
7683 | ||
996ae0b0 RK |
7684 | -- Loop through entities in one package making them potentially |
7685 | -- use-visible. | |
7686 | ||
7687 | Id := First_Entity (P); | |
7688 | while Present (Id) | |
9bc856dd | 7689 | and then (Id /= First_Private_Entity (P) |
0ab80019 | 7690 | or else Private_With_OK) -- Ada 2005 (AI-262) |
996ae0b0 RK |
7691 | loop |
7692 | Prev := Current_Entity (Id); | |
996ae0b0 RK |
7693 | while Present (Prev) loop |
7694 | if Is_Immediately_Visible (Prev) | |
7695 | and then (not Is_Overloadable (Prev) | |
7696 | or else not Is_Overloadable (Id) | |
7697 | or else (Type_Conformant (Id, Prev))) | |
7698 | then | |
7699 | if No (Current_Instance) then | |
7700 | ||
7701 | -- Potentially use-visible entity remains hidden | |
7702 | ||
7703 | goto Next_Usable_Entity; | |
7704 | ||
16ca248a ES |
7705 | -- A use clause within an instance hides outer global entities, |
7706 | -- which are not used to resolve local entities in the | |
7707 | -- instance. Note that the predefined entities in Standard | |
7708 | -- could not have been hidden in the generic by a use clause, | |
7709 | -- and therefore remain visible. Other compilation units whose | |
7710 | -- entities appear in Standard must be hidden in an instance. | |
996ae0b0 RK |
7711 | |
7712 | -- To determine whether an entity is external to the instance | |
7713 | -- we compare the scope depth of its scope with that of the | |
7714 | -- current instance. However, a generic actual of a subprogram | |
7715 | -- instance is declared in the wrapper package but will not be | |
e074d476 AC |
7716 | -- hidden by a use-visible entity. similarly, an entity that is |
7717 | -- declared in an enclosing instance will not be hidden by an | |
7718 | -- an entity declared in a generic actual, which can only have | |
7719 | -- been use-visible in the generic and will not have hidden the | |
7720 | -- entity in the generic parent. | |
996ae0b0 | 7721 | |
82c80734 RD |
7722 | -- If Id is called Standard, the predefined package with the |
7723 | -- same name is in the homonym chain. It has to be ignored | |
7724 | -- because it has no defined scope (being the only entity in | |
7725 | -- the system with this mandated behavior). | |
7726 | ||
996ae0b0 | 7727 | elsif not Is_Hidden (Id) |
82c80734 | 7728 | and then Present (Scope (Prev)) |
996ae0b0 RK |
7729 | and then not Is_Wrapper_Package (Scope (Prev)) |
7730 | and then Scope_Depth (Scope (Prev)) < | |
7731 | Scope_Depth (Current_Instance) | |
7732 | and then (Scope (Prev) /= Standard_Standard | |
7733 | or else Sloc (Prev) > Standard_Location) | |
7734 | then | |
e074d476 AC |
7735 | if In_Open_Scopes (Scope (Prev)) |
7736 | and then Is_Generic_Instance (Scope (Prev)) | |
c94a0b9d AC |
7737 | and then Present (Associated_Formal_Package (P)) |
7738 | then | |
7739 | null; | |
7740 | ||
7741 | else | |
7742 | Set_Is_Potentially_Use_Visible (Id); | |
7743 | Set_Is_Immediately_Visible (Prev, False); | |
7744 | Append_Elmt (Prev, Hidden_By_Use_Clause (N)); | |
7745 | end if; | |
996ae0b0 RK |
7746 | end if; |
7747 | ||
16ca248a ES |
7748 | -- A user-defined operator is not use-visible if the predefined |
7749 | -- operator for the type is immediately visible, which is the case | |
7750 | -- if the type of the operand is in an open scope. This does not | |
7751 | -- apply to user-defined operators that have operands of different | |
7752 | -- types, because the predefined mixed mode operations (multiply | |
7753 | -- and divide) apply to universal types and do not hide anything. | |
996ae0b0 RK |
7754 | |
7755 | elsif Ekind (Prev) = E_Operator | |
7756 | and then Operator_Matches_Spec (Prev, Id) | |
7757 | and then In_Open_Scopes | |
7758 | (Scope (Base_Type (Etype (First_Formal (Id))))) | |
7759 | and then (No (Next_Formal (First_Formal (Id))) | |
7760 | or else Etype (First_Formal (Id)) | |
7761 | = Etype (Next_Formal (First_Formal (Id))) | |
7762 | or else Chars (Prev) = Name_Op_Expon) | |
7763 | then | |
7764 | goto Next_Usable_Entity; | |
e69614ad AC |
7765 | |
7766 | -- In an instance, two homonyms may become use_visible through the | |
7767 | -- actuals of distinct formal packages. In the generic, only the | |
7768 | -- current one would have been visible, so make the other one | |
7769 | -- not use_visible. | |
7770 | ||
7771 | elsif Present (Current_Instance) | |
7772 | and then Is_Potentially_Use_Visible (Prev) | |
7773 | and then not Is_Overloadable (Prev) | |
7774 | and then Scope (Id) /= Scope (Prev) | |
7775 | and then Used_As_Generic_Actual (Scope (Prev)) | |
7776 | and then Used_As_Generic_Actual (Scope (Id)) | |
30196a76 RD |
7777 | and then not In_Same_List (Current_Use_Clause (Scope (Prev)), |
7778 | Current_Use_Clause (Scope (Id))) | |
e69614ad AC |
7779 | then |
7780 | Set_Is_Potentially_Use_Visible (Prev, False); | |
7781 | Append_Elmt (Prev, Hidden_By_Use_Clause (N)); | |
996ae0b0 RK |
7782 | end if; |
7783 | ||
7784 | Prev := Homonym (Prev); | |
7785 | end loop; | |
7786 | ||
bc41faa2 | 7787 | -- On exit, we know entity is not hidden, unless it is private |
996ae0b0 RK |
7788 | |
7789 | if not Is_Hidden (Id) | |
7790 | and then ((not Is_Child_Unit (Id)) | |
7791 | or else Is_Visible_Child_Unit (Id)) | |
7792 | then | |
7793 | Set_Is_Potentially_Use_Visible (Id); | |
7794 | ||
7795 | if Is_Private_Type (Id) | |
7796 | and then Present (Full_View (Id)) | |
7797 | then | |
7798 | Set_Is_Potentially_Use_Visible (Full_View (Id)); | |
7799 | end if; | |
7800 | end if; | |
7801 | ||
7802 | <<Next_Usable_Entity>> | |
7803 | Next_Entity (Id); | |
7804 | end loop; | |
7805 | ||
16ca248a ES |
7806 | -- Child units are also made use-visible by a use clause, but they may |
7807 | -- appear after all visible declarations in the parent entity list. | |
996ae0b0 RK |
7808 | |
7809 | while Present (Id) loop | |
996ae0b0 RK |
7810 | if Is_Child_Unit (Id) |
7811 | and then Is_Visible_Child_Unit (Id) | |
7812 | then | |
7813 | Set_Is_Potentially_Use_Visible (Id); | |
7814 | end if; | |
7815 | ||
7816 | Next_Entity (Id); | |
7817 | end loop; | |
7818 | ||
7819 | if Chars (Real_P) = Name_System | |
7820 | and then Scope (Real_P) = Standard_Standard | |
7821 | and then Present_System_Aux (N) | |
7822 | then | |
7823 | Use_One_Package (System_Aux_Id, N); | |
7824 | end if; | |
7825 | ||
7826 | end Use_One_Package; | |
7827 | ||
7828 | ------------------ | |
7829 | -- Use_One_Type -- | |
7830 | ------------------ | |
7831 | ||
7ff2d234 | 7832 | procedure Use_One_Type (Id : Node_Id; Installed : Boolean := False) is |
954c111a HK |
7833 | Elmt : Elmt_Id; |
7834 | Is_Known_Used : Boolean; | |
7835 | Op_List : Elist_Id; | |
7836 | T : Entity_Id; | |
7837 | ||
7838 | function Spec_Reloaded_For_Body return Boolean; | |
7839 | -- Determine whether the compilation unit is a package body and the use | |
7840 | -- type clause is in the spec of the same package. Even though the spec | |
7841 | -- was analyzed first, its context is reloaded when analysing the body. | |
7842 | ||
29efbb8c ES |
7843 | procedure Use_Class_Wide_Operations (Typ : Entity_Id); |
7844 | -- AI05-150: if the use_type_clause carries the "all" qualifier, | |
7845 | -- class-wide operations of ancestor types are use-visible if the | |
7846 | -- ancestor type is visible. | |
7847 | ||
954c111a HK |
7848 | ---------------------------- |
7849 | -- Spec_Reloaded_For_Body -- | |
7850 | ---------------------------- | |
7851 | ||
7852 | function Spec_Reloaded_For_Body return Boolean is | |
7853 | begin | |
7854 | if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body then | |
7855 | declare | |
7856 | Spec : constant Node_Id := | |
7857 | Parent (List_Containing (Parent (Id))); | |
7858 | begin | |
7859 | return | |
7860 | Nkind (Spec) = N_Package_Specification | |
7861 | and then Corresponding_Body (Parent (Spec)) = | |
7862 | Cunit_Entity (Current_Sem_Unit); | |
7863 | end; | |
7864 | end if; | |
7865 | ||
7866 | return False; | |
7867 | end Spec_Reloaded_For_Body; | |
7868 | ||
29efbb8c ES |
7869 | ------------------------------- |
7870 | -- Use_Class_Wide_Operations -- | |
7871 | ------------------------------- | |
7872 | ||
7873 | procedure Use_Class_Wide_Operations (Typ : Entity_Id) is | |
7874 | Scop : Entity_Id; | |
7875 | Ent : Entity_Id; | |
7876 | ||
7877 | function Is_Class_Wide_Operation_Of | |
7878 | (Op : Entity_Id; | |
7879 | T : Entity_Id) return Boolean; | |
7880 | -- Determine whether a subprogram has a class-wide parameter or | |
7881 | -- result that is T'Class. | |
7882 | ||
7883 | --------------------------------- | |
7884 | -- Is_Class_Wide_Operation_Of -- | |
7885 | --------------------------------- | |
7886 | ||
7887 | function Is_Class_Wide_Operation_Of | |
7888 | (Op : Entity_Id; | |
7889 | T : Entity_Id) return Boolean | |
7890 | is | |
7891 | Formal : Entity_Id; | |
7892 | ||
7893 | begin | |
7894 | Formal := First_Formal (Op); | |
7895 | while Present (Formal) loop | |
7896 | if Etype (Formal) = Class_Wide_Type (T) then | |
7897 | return True; | |
7898 | end if; | |
7899 | Next_Formal (Formal); | |
7900 | end loop; | |
7901 | ||
7902 | if Etype (Op) = Class_Wide_Type (T) then | |
7903 | return True; | |
7904 | end if; | |
7905 | ||
7906 | return False; | |
7907 | end Is_Class_Wide_Operation_Of; | |
7908 | ||
7909 | -- Start of processing for Use_Class_Wide_Operations | |
7910 | ||
7911 | begin | |
7912 | Scop := Scope (Typ); | |
7913 | if not Is_Hidden (Scop) then | |
7914 | Ent := First_Entity (Scop); | |
7915 | while Present (Ent) loop | |
7916 | if Is_Overloadable (Ent) | |
7917 | and then Is_Class_Wide_Operation_Of (Ent, Typ) | |
7918 | and then not Is_Potentially_Use_Visible (Ent) | |
7919 | then | |
7920 | Set_Is_Potentially_Use_Visible (Ent); | |
7921 | Append_Elmt (Ent, Used_Operations (Parent (Id))); | |
7922 | end if; | |
7923 | ||
7924 | Next_Entity (Ent); | |
7925 | end loop; | |
7926 | end if; | |
7927 | ||
7928 | if Is_Derived_Type (Typ) then | |
7929 | Use_Class_Wide_Operations (Etype (Base_Type (Typ))); | |
7930 | end if; | |
7931 | end Use_Class_Wide_Operations; | |
7932 | ||
954c111a | 7933 | -- Start of processing for Use_One_Type; |
996ae0b0 RK |
7934 | |
7935 | begin | |
7936 | -- It is the type determined by the subtype mark (8.4(8)) whose | |
7937 | -- operations become potentially use-visible. | |
7938 | ||
7939 | T := Base_Type (Entity (Id)); | |
7940 | ||
954c111a HK |
7941 | -- Either the type itself is used, the package where it is declared |
7942 | -- is in use or the entity is declared in the current package, thus | |
7943 | -- use-visible. | |
7944 | ||
7945 | Is_Known_Used := | |
7946 | In_Use (T) | |
7947 | or else In_Use (Scope (T)) | |
7948 | or else Scope (T) = Current_Scope; | |
7949 | ||
7950 | Set_Redundant_Use (Id, | |
7951 | Is_Known_Used or else Is_Potentially_Use_Visible (T)); | |
996ae0b0 | 7952 | |
ecc4ddde AC |
7953 | if Ekind (T) = E_Incomplete_Type then |
7954 | Error_Msg_N ("premature usage of incomplete type", Id); | |
7955 | ||
7956 | elsif In_Open_Scopes (Scope (T)) then | |
996ae0b0 RK |
7957 | null; |
7958 | ||
f7ca1d04 AC |
7959 | -- A limited view cannot appear in a use_type clause. However, an access |
7960 | -- type whose designated type is limited has the flag but is not itself | |
7961 | -- a limited view unless we only have a limited view of its enclosing | |
7962 | -- package. | |
294ccb21 RD |
7963 | |
7964 | elsif From_With_Type (T) | |
7965 | and then From_With_Type (Scope (T)) | |
7966 | then | |
923fa078 RD |
7967 | Error_Msg_N |
7968 | ("incomplete type from limited view " | |
7969 | & "cannot appear in use clause", Id); | |
7970 | ||
fbf5a39b AC |
7971 | -- If the subtype mark designates a subtype in a different package, |
7972 | -- we have to check that the parent type is visible, otherwise the | |
7973 | -- use type clause is a noop. Not clear how to do that??? | |
7974 | ||
996ae0b0 RK |
7975 | elsif not Redundant_Use (Id) then |
7976 | Set_In_Use (T); | |
c3b36d48 AC |
7977 | |
7978 | -- If T is tagged, primitive operators on class-wide operands | |
7979 | -- are also available. | |
7980 | ||
7981 | if Is_Tagged_Type (T) then | |
7982 | Set_In_Use (Class_Wide_Type (T)); | |
7983 | end if; | |
7984 | ||
21d27997 | 7985 | Set_Current_Use_Clause (T, Parent (Id)); |
996ae0b0 | 7986 | |
29efbb8c ES |
7987 | -- Iterate over primitive operations of the type. If an operation is |
7988 | -- already use_visible, it is the result of a previous use_clause, | |
7ff2d234 AC |
7989 | -- and already appears on the corresponding entity chain. If the |
7990 | -- clause is being reinstalled, operations are already use-visible. | |
29efbb8c | 7991 | |
7ff2d234 AC |
7992 | if Installed then |
7993 | null; | |
29efbb8c | 7994 | |
7ff2d234 AC |
7995 | else |
7996 | Op_List := Collect_Primitive_Operations (T); | |
7997 | Elmt := First_Elmt (Op_List); | |
7998 | while Present (Elmt) loop | |
7999 | if (Nkind (Node (Elmt)) = N_Defining_Operator_Symbol | |
8000 | or else Chars (Node (Elmt)) in Any_Operator_Name) | |
8001 | and then not Is_Hidden (Node (Elmt)) | |
8002 | and then not Is_Potentially_Use_Visible (Node (Elmt)) | |
8003 | then | |
8004 | Set_Is_Potentially_Use_Visible (Node (Elmt)); | |
8005 | Append_Elmt (Node (Elmt), Used_Operations (Parent (Id))); | |
996ae0b0 | 8006 | |
7ff2d234 AC |
8007 | elsif Ada_Version >= Ada_2012 |
8008 | and then All_Present (Parent (Id)) | |
8009 | and then not Is_Hidden (Node (Elmt)) | |
8010 | and then not Is_Potentially_Use_Visible (Node (Elmt)) | |
8011 | then | |
8012 | Set_Is_Potentially_Use_Visible (Node (Elmt)); | |
8013 | Append_Elmt (Node (Elmt), Used_Operations (Parent (Id))); | |
8014 | end if; | |
954c111a | 8015 | |
7ff2d234 AC |
8016 | Next_Elmt (Elmt); |
8017 | end loop; | |
8018 | end if; | |
8019 | ||
8020 | if Ada_Version >= Ada_2012 | |
8021 | and then All_Present (Parent (Id)) | |
8022 | and then Is_Tagged_Type (T) | |
8023 | then | |
8024 | Use_Class_Wide_Operations (T); | |
8025 | end if; | |
29efbb8c ES |
8026 | end if; |
8027 | ||
954c111a HK |
8028 | -- If warning on redundant constructs, check for unnecessary WITH |
8029 | ||
8030 | if Warn_On_Redundant_Constructs | |
8031 | and then Is_Known_Used | |
8032 | ||
8033 | -- with P; with P; use P; | |
8034 | -- package P is package X is package body X is | |
8035 | -- type T ... use P.T; | |
8036 | ||
8037 | -- The compilation unit is the body of X. GNAT first compiles the | |
f3d57416 | 8038 | -- spec of X, then proceeds to the body. At that point P is marked |
954c111a HK |
8039 | -- as use visible. The analysis then reinstalls the spec along with |
8040 | -- its context. The use clause P.T is now recognized as redundant, | |
8041 | -- but in the wrong context. Do not emit a warning in such cases. | |
f7ca1d04 AC |
8042 | -- Do not emit a warning either if we are in an instance, there is |
8043 | -- no redundancy between an outer use_clause and one that appears | |
c56094bd | 8044 | -- within the generic. |
954c111a HK |
8045 | |
8046 | and then not Spec_Reloaded_For_Body | |
c56094bd | 8047 | and then not In_Instance |
954c111a HK |
8048 | then |
8049 | -- The type already has a use clause | |
8050 | ||
8051 | if In_Use (T) then | |
3ea52b2e ES |
8052 | |
8053 | -- Case where we know the current use clause for the type | |
8054 | ||
21d27997 | 8055 | if Present (Current_Use_Clause (T)) then |
44b90160 | 8056 | Use_Clause_Known : declare |
21d27997 RD |
8057 | Clause1 : constant Node_Id := Parent (Id); |
8058 | Clause2 : constant Node_Id := Current_Use_Clause (T); | |
3ea52b2e ES |
8059 | Ent1 : Entity_Id; |
8060 | Ent2 : Entity_Id; | |
21d27997 RD |
8061 | Err_No : Node_Id; |
8062 | Unit1 : Node_Id; | |
8063 | Unit2 : Node_Id; | |
8064 | ||
7ca139d3 TQ |
8065 | function Entity_Of_Unit (U : Node_Id) return Entity_Id; |
8066 | -- Return the appropriate entity for determining which unit | |
8067 | -- has a deeper scope: the defining entity for U, unless U | |
8068 | -- is a package instance, in which case we retrieve the | |
8069 | -- entity of the instance spec. | |
8070 | ||
8071 | -------------------- | |
8072 | -- Entity_Of_Unit -- | |
8073 | -------------------- | |
8074 | ||
8075 | function Entity_Of_Unit (U : Node_Id) return Entity_Id is | |
8076 | begin | |
8077 | if Nkind (U) = N_Package_Instantiation | |
8078 | and then Analyzed (U) | |
8079 | then | |
8080 | return Defining_Entity (Instance_Spec (U)); | |
8081 | else | |
8082 | return Defining_Entity (U); | |
8083 | end if; | |
8084 | end Entity_Of_Unit; | |
8085 | ||
44b90160 RD |
8086 | -- Start of processing for Use_Clause_Known |
8087 | ||
21d27997 | 8088 | begin |
f7ca1d04 AC |
8089 | -- If both current use type clause and the use type clause |
8090 | -- for the type are at the compilation unit level, one of | |
8091 | -- the units must be an ancestor of the other, and the | |
8092 | -- warning belongs on the descendant. | |
3ea52b2e | 8093 | |
21d27997 | 8094 | if Nkind (Parent (Clause1)) = N_Compilation_Unit |
3ea52b2e ES |
8095 | and then |
8096 | Nkind (Parent (Clause2)) = N_Compilation_Unit | |
21d27997 | 8097 | then |
b0d3b11d AC |
8098 | |
8099 | -- If the unit is a subprogram body that acts as spec, | |
8100 | -- the context clause is shared with the constructed | |
8101 | -- subprogram spec. Clearly there is no redundancy. | |
8102 | ||
8103 | if Clause1 = Clause2 then | |
8104 | return; | |
8105 | end if; | |
8106 | ||
3ea52b2e ES |
8107 | Unit1 := Unit (Parent (Clause1)); |
8108 | Unit2 := Unit (Parent (Clause2)); | |
8109 | ||
32beb1f3 AC |
8110 | -- If both clauses are on same unit, or one is the body |
8111 | -- of the other, or one of them is in a subunit, report | |
8112 | -- redundancy on the later one. | |
f7ca1d04 AC |
8113 | |
8114 | if Unit1 = Unit2 then | |
8115 | Error_Msg_Sloc := Sloc (Current_Use_Clause (T)); | |
ed2233dc | 8116 | Error_Msg_NE -- CODEFIX |
f7ca1d04 AC |
8117 | ("& is already use-visible through previous " |
8118 | & "use_type_clause #?", Clause1, T); | |
8119 | return; | |
32beb1f3 AC |
8120 | |
8121 | elsif Nkind (Unit1) = N_Subunit then | |
8122 | Error_Msg_Sloc := Sloc (Current_Use_Clause (T)); | |
ed2233dc | 8123 | Error_Msg_NE -- CODEFIX |
32beb1f3 AC |
8124 | ("& is already use-visible through previous " |
8125 | & "use_type_clause #?", Clause1, T); | |
8126 | return; | |
8127 | ||
8128 | elsif Nkind_In (Unit2, N_Package_Body, N_Subprogram_Body) | |
8129 | and then Nkind (Unit1) /= Nkind (Unit2) | |
8130 | and then Nkind (Unit1) /= N_Subunit | |
8131 | then | |
8132 | Error_Msg_Sloc := Sloc (Clause1); | |
ed2233dc | 8133 | Error_Msg_NE -- CODEFIX |
32beb1f3 AC |
8134 | ("& is already use-visible through previous " |
8135 | & "use_type_clause #?", Current_Use_Clause (T), T); | |
8136 | return; | |
f7ca1d04 AC |
8137 | end if; |
8138 | ||
21d27997 RD |
8139 | -- There is a redundant use type clause in a child unit. |
8140 | -- Determine which of the units is more deeply nested. | |
3ea52b2e | 8141 | -- If a unit is a package instance, retrieve the entity |
7ca139d3 | 8142 | -- and its scope from the instance spec. |
21d27997 | 8143 | |
7ca139d3 TQ |
8144 | Ent1 := Entity_Of_Unit (Unit1); |
8145 | Ent2 := Entity_Of_Unit (Unit2); | |
3ea52b2e ES |
8146 | |
8147 | if Scope (Ent2) = Standard_Standard then | |
21d27997 RD |
8148 | Error_Msg_Sloc := Sloc (Current_Use_Clause (T)); |
8149 | Err_No := Clause1; | |
8150 | ||
3ea52b2e | 8151 | elsif Scope (Ent1) = Standard_Standard then |
21d27997 RD |
8152 | Error_Msg_Sloc := Sloc (Id); |
8153 | Err_No := Clause2; | |
8154 | ||
7ca139d3 TQ |
8155 | -- If both units are child units, we determine which one |
8156 | -- is the descendant by the scope distance to the | |
3ea52b2e | 8157 | -- ultimate parent unit. |
21d27997 | 8158 | |
3ea52b2e | 8159 | else |
21d27997 RD |
8160 | declare |
8161 | S1, S2 : Entity_Id; | |
8162 | ||
8163 | begin | |
3ea52b2e ES |
8164 | S1 := Scope (Ent1); |
8165 | S2 := Scope (Ent2); | |
c97c0163 AC |
8166 | while Present (S1) |
8167 | and then Present (S2) | |
8168 | and then S1 /= Standard_Standard | |
8169 | and then S2 /= Standard_Standard | |
21d27997 RD |
8170 | loop |
8171 | S1 := Scope (S1); | |
8172 | S2 := Scope (S2); | |
8173 | end loop; | |
8174 | ||
8175 | if S1 = Standard_Standard then | |
8176 | Error_Msg_Sloc := Sloc (Id); | |
8177 | Err_No := Clause2; | |
8178 | else | |
8179 | Error_Msg_Sloc := Sloc (Current_Use_Clause (T)); | |
8180 | Err_No := Clause1; | |
8181 | end if; | |
8182 | end; | |
8183 | end if; | |
8184 | ||
ed2233dc | 8185 | Error_Msg_NE -- CODEFIX |
21d27997 RD |
8186 | ("& is already use-visible through previous " |
8187 | & "use_type_clause #?", Err_No, Id); | |
3ea52b2e ES |
8188 | |
8189 | -- Case where current use type clause and the use type | |
8190 | -- clause for the type are not both at the compilation unit | |
8191 | -- level. In this case we don't have location information. | |
8192 | ||
21d27997 | 8193 | else |
ed2233dc | 8194 | Error_Msg_NE -- CODEFIX |
3ea52b2e | 8195 | ("& is already use-visible through previous " |
37951d8e | 8196 | & "use type clause?", Id, T); |
21d27997 | 8197 | end if; |
44b90160 | 8198 | end Use_Clause_Known; |
3ea52b2e ES |
8199 | |
8200 | -- Here if Current_Use_Clause is not set for T, another case | |
8201 | -- where we do not have the location information available. | |
8202 | ||
21d27997 | 8203 | else |
ed2233dc | 8204 | Error_Msg_NE -- CODEFIX |
3ea52b2e | 8205 | ("& is already use-visible through previous " |
37951d8e | 8206 | & "use type clause?", Id, T); |
21d27997 | 8207 | end if; |
954c111a HK |
8208 | |
8209 | -- The package where T is declared is already used | |
8210 | ||
8211 | elsif In_Use (Scope (T)) then | |
8212 | Error_Msg_Sloc := Sloc (Current_Use_Clause (Scope (T))); | |
ed2233dc | 8213 | Error_Msg_NE -- CODEFIX |
954c111a | 8214 | ("& is already use-visible through package use clause #?", |
37951d8e | 8215 | Id, T); |
954c111a HK |
8216 | |
8217 | -- The current scope is the package where T is declared | |
8218 | ||
8219 | else | |
8220 | Error_Msg_Node_2 := Scope (T); | |
ed2233dc | 8221 | Error_Msg_NE -- CODEFIX |
37951d8e | 8222 | ("& is already use-visible inside package &?", Id, T); |
954c111a HK |
8223 | end if; |
8224 | end if; | |
996ae0b0 RK |
8225 | end Use_One_Type; |
8226 | ||
8227 | ---------------- | |
8228 | -- Write_Info -- | |
8229 | ---------------- | |
8230 | ||
8231 | procedure Write_Info is | |
8232 | Id : Entity_Id := First_Entity (Current_Scope); | |
8233 | ||
8234 | begin | |
8235 | -- No point in dumping standard entities | |
8236 | ||
8237 | if Current_Scope = Standard_Standard then | |
8238 | return; | |
8239 | end if; | |
8240 | ||
8241 | Write_Str ("========================================================"); | |
8242 | Write_Eol; | |
8243 | Write_Str (" Defined Entities in "); | |
8244 | Write_Name (Chars (Current_Scope)); | |
8245 | Write_Eol; | |
8246 | Write_Str ("========================================================"); | |
8247 | Write_Eol; | |
8248 | ||
8249 | if No (Id) then | |
8250 | Write_Str ("-- none --"); | |
8251 | Write_Eol; | |
8252 | ||
8253 | else | |
8254 | while Present (Id) loop | |
8255 | Write_Entity_Info (Id, " "); | |
8256 | Next_Entity (Id); | |
8257 | end loop; | |
8258 | end if; | |
8259 | ||
8260 | if Scope (Current_Scope) = Standard_Standard then | |
8261 | ||
8262 | -- Print information on the current unit itself | |
8263 | ||
8264 | Write_Entity_Info (Current_Scope, " "); | |
8265 | end if; | |
8266 | ||
8267 | Write_Eol; | |
8268 | end Write_Info; | |
8269 | ||
67536dcb RD |
8270 | -------- |
8271 | -- ws -- | |
8272 | -------- | |
996ae0b0 | 8273 | |
67536dcb | 8274 | procedure ws is |
996ae0b0 | 8275 | S : Entity_Id; |
996ae0b0 RK |
8276 | begin |
8277 | for J in reverse 1 .. Scope_Stack.Last loop | |
8278 | S := Scope_Stack.Table (J).Entity; | |
8279 | Write_Int (Int (S)); | |
8280 | Write_Str (" === "); | |
8281 | Write_Name (Chars (S)); | |
8282 | Write_Eol; | |
8283 | end loop; | |
67536dcb | 8284 | end ws; |
996ae0b0 RK |
8285 | |
8286 | end Sem_Ch8; |