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d6f39728 | 1 | ------------------------------------------------------------------------------ |
7189d17f | 2 | -- -- |
d6f39728 | 3 | -- GNAT COMPILER COMPONENTS -- |
4 | -- -- | |
5 | -- S E M _ C H 1 3 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
8 | -- -- | |
60a4a5af | 9 | -- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- |
d6f39728 | 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- -- | |
80df182a | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
d6f39728 | 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 -- | |
80df182a | 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. -- | |
d6f39728 | 20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
e78e8c8e | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
d6f39728 | 23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
ae888dbd | 26 | with Aspects; use Aspects; |
d6f39728 | 27 | with Atree; use Atree; |
713c00d6 | 28 | with Checks; use Checks; |
175a6969 | 29 | with Debug; use Debug; |
d6f39728 | 30 | with Einfo; use Einfo; |
d00681a7 | 31 | with Elists; use Elists; |
d6f39728 | 32 | with Errout; use Errout; |
d00681a7 | 33 | with Exp_Disp; use Exp_Disp; |
d6f39728 | 34 | with Exp_Tss; use Exp_Tss; |
35 | with Exp_Util; use Exp_Util; | |
37c6552c | 36 | with Freeze; use Freeze; |
d6f39728 | 37 | with Lib; use Lib; |
83f8f0a6 | 38 | with Lib.Xref; use Lib.Xref; |
15ebb600 | 39 | with Namet; use Namet; |
d6f39728 | 40 | with Nlists; use Nlists; |
41 | with Nmake; use Nmake; | |
42 | with Opt; use Opt; | |
e0521a36 | 43 | with Restrict; use Restrict; |
44 | with Rident; use Rident; | |
d6f39728 | 45 | with Rtsfind; use Rtsfind; |
46 | with Sem; use Sem; | |
d60c9ff7 | 47 | with Sem_Aux; use Sem_Aux; |
be9124d0 | 48 | with Sem_Case; use Sem_Case; |
40ca69b9 | 49 | with Sem_Ch3; use Sem_Ch3; |
490beba6 | 50 | with Sem_Ch6; use Sem_Ch6; |
d6f39728 | 51 | with Sem_Ch8; use Sem_Ch8; |
85696508 | 52 | with Sem_Dim; use Sem_Dim; |
85377c9b | 53 | with Sem_Disp; use Sem_Disp; |
d6f39728 | 54 | with Sem_Eval; use Sem_Eval; |
51ea9c94 | 55 | with Sem_Prag; use Sem_Prag; |
d6f39728 | 56 | with Sem_Res; use Sem_Res; |
57 | with Sem_Type; use Sem_Type; | |
58 | with Sem_Util; use Sem_Util; | |
44e4341e | 59 | with Sem_Warn; use Sem_Warn; |
1e3c4ae6 | 60 | with Sinput; use Sinput; |
9dfe12ae | 61 | with Snames; use Snames; |
d6f39728 | 62 | with Stand; use Stand; |
63 | with Sinfo; use Sinfo; | |
5b5df4a9 | 64 | with Stringt; use Stringt; |
93735cb8 | 65 | with Targparm; use Targparm; |
d6f39728 | 66 | with Ttypes; use Ttypes; |
67 | with Tbuild; use Tbuild; | |
68 | with Urealp; use Urealp; | |
f42f24d7 | 69 | with Warnsw; use Warnsw; |
d6f39728 | 70 | |
bfa5a9d9 | 71 | with GNAT.Heap_Sort_G; |
d6f39728 | 72 | |
73 | package body Sem_Ch13 is | |
74 | ||
75 | SSU : constant Pos := System_Storage_Unit; | |
76 | -- Convenient short hand for commonly used constant | |
77 | ||
78 | ----------------------- | |
79 | -- Local Subprograms -- | |
80 | ----------------------- | |
81 | ||
1d366b32 | 82 | procedure Alignment_Check_For_Size_Change (Typ : Entity_Id; Size : Uint); |
83 | -- This routine is called after setting one of the sizes of type entity | |
84 | -- Typ to Size. The purpose is to deal with the situation of a derived | |
85 | -- type whose inherited alignment is no longer appropriate for the new | |
86 | -- size value. In this case, we reset the Alignment to unknown. | |
d6f39728 | 87 | |
eb66e842 | 88 | procedure Build_Discrete_Static_Predicate |
d97beb2f | 89 | (Typ : Entity_Id; |
90 | Expr : Node_Id; | |
91 | Nam : Name_Id); | |
d7c2851f | 92 | -- Given a predicated type Typ, where Typ is a discrete static subtype, |
93 | -- whose predicate expression is Expr, tests if Expr is a static predicate, | |
94 | -- and if so, builds the predicate range list. Nam is the name of the one | |
95 | -- argument to the predicate function. Occurrences of the type name in the | |
6fb3c314 | 96 | -- predicate expression have been replaced by identifier references to this |
d7c2851f | 97 | -- name, which is unique, so any identifier with Chars matching Nam must be |
98 | -- a reference to the type. If the predicate is non-static, this procedure | |
99 | -- returns doing nothing. If the predicate is static, then the predicate | |
5c6a5792 | 100 | -- list is stored in Static_Discrete_Predicate (Typ), and the Expr is |
101 | -- rewritten as a canonicalized membership operation. | |
d97beb2f | 102 | |
eb66e842 | 103 | procedure Build_Predicate_Functions (Typ : Entity_Id; N : Node_Id); |
104 | -- If Typ has predicates (indicated by Has_Predicates being set for Typ), | |
105 | -- then either there are pragma Predicate entries on the rep chain for the | |
106 | -- type (note that Predicate aspects are converted to pragma Predicate), or | |
107 | -- there are inherited aspects from a parent type, or ancestor subtypes. | |
108 | -- This procedure builds the spec and body for the Predicate function that | |
109 | -- tests these predicates. N is the freeze node for the type. The spec of | |
110 | -- the function is inserted before the freeze node, and the body of the | |
111 | -- function is inserted after the freeze node. If the predicate expression | |
112 | -- has at least one Raise_Expression, then this procedure also builds the | |
113 | -- M version of the predicate function for use in membership tests. | |
114 | ||
6653b695 | 115 | procedure Check_Pool_Size_Clash (Ent : Entity_Id; SP, SS : Node_Id); |
116 | -- Called if both Storage_Pool and Storage_Size attribute definition | |
117 | -- clauses (SP and SS) are present for entity Ent. Issue error message. | |
118 | ||
d9f6a4ee | 119 | procedure Freeze_Entity_Checks (N : Node_Id); |
120 | -- Called from Analyze_Freeze_Entity and Analyze_Generic_Freeze Entity | |
121 | -- to generate appropriate semantic checks that are delayed until this | |
122 | -- point (they had to be delayed this long for cases of delayed aspects, | |
123 | -- e.g. analysis of statically predicated subtypes in choices, for which | |
124 | -- we have to be sure the subtypes in question are frozen before checking. | |
125 | ||
d6f39728 | 126 | function Get_Alignment_Value (Expr : Node_Id) return Uint; |
127 | -- Given the expression for an alignment value, returns the corresponding | |
128 | -- Uint value. If the value is inappropriate, then error messages are | |
129 | -- posted as required, and a value of No_Uint is returned. | |
130 | ||
131 | function Is_Operational_Item (N : Node_Id) return Boolean; | |
1e3c4ae6 | 132 | -- A specification for a stream attribute is allowed before the full type |
133 | -- is declared, as explained in AI-00137 and the corrigendum. Attributes | |
134 | -- that do not specify a representation characteristic are operational | |
135 | -- attributes. | |
d6f39728 | 136 | |
3b23aaa0 | 137 | function Is_Predicate_Static |
138 | (Expr : Node_Id; | |
139 | Nam : Name_Id) return Boolean; | |
140 | -- Given predicate expression Expr, tests if Expr is predicate-static in | |
141 | -- the sense of the rules in (RM 3.2.4 (15-24)). Occurrences of the type | |
142 | -- name in the predicate expression have been replaced by references to | |
143 | -- an identifier whose Chars field is Nam. This name is unique, so any | |
144 | -- identifier with Chars matching Nam must be a reference to the type. | |
145 | -- Returns True if the expression is predicate-static and False otherwise, | |
146 | -- but is not in the business of setting flags or issuing error messages. | |
147 | -- | |
148 | -- Only scalar types can have static predicates, so False is always | |
149 | -- returned for non-scalar types. | |
150 | -- | |
151 | -- Note: the RM seems to suggest that string types can also have static | |
152 | -- predicates. But that really makes lttle sense as very few useful | |
153 | -- predicates can be constructed for strings. Remember that: | |
154 | -- | |
155 | -- "ABC" < "DEF" | |
156 | -- | |
157 | -- is not a static expression. So even though the clearly faulty RM wording | |
158 | -- allows the following: | |
159 | -- | |
160 | -- subtype S is String with Static_Predicate => S < "DEF" | |
161 | -- | |
162 | -- We can't allow this, otherwise we have predicate-static applying to a | |
163 | -- larger class than static expressions, which was never intended. | |
164 | ||
44e4341e | 165 | procedure New_Stream_Subprogram |
d6f39728 | 166 | (N : Node_Id; |
167 | Ent : Entity_Id; | |
168 | Subp : Entity_Id; | |
9dfe12ae | 169 | Nam : TSS_Name_Type); |
44e4341e | 170 | -- Create a subprogram renaming of a given stream attribute to the |
171 | -- designated subprogram and then in the tagged case, provide this as a | |
d1a2e31b | 172 | -- primitive operation, or in the untagged case make an appropriate TSS |
44e4341e | 173 | -- entry. This is more properly an expansion activity than just semantics, |
d1a2e31b | 174 | -- but the presence of user-defined stream functions for limited types |
175 | -- is a legality check, which is why this takes place here rather than in | |
44e4341e | 176 | -- exp_ch13, where it was previously. Nam indicates the name of the TSS |
177 | -- function to be generated. | |
9dfe12ae | 178 | -- |
f15731c4 | 179 | -- To avoid elaboration anomalies with freeze nodes, for untagged types |
180 | -- we generate both a subprogram declaration and a subprogram renaming | |
181 | -- declaration, so that the attribute specification is handled as a | |
182 | -- renaming_as_body. For tagged types, the specification is one of the | |
183 | -- primitive specs. | |
184 | ||
3061ffde | 185 | procedure Resolve_Iterable_Operation |
186 | (N : Node_Id; | |
187 | Cursor : Entity_Id; | |
188 | Typ : Entity_Id; | |
189 | Nam : Name_Id); | |
190 | -- If the name of a primitive operation for an Iterable aspect is | |
191 | -- overloaded, resolve according to required signature. | |
192 | ||
b77e4501 | 193 | procedure Set_Biased |
194 | (E : Entity_Id; | |
195 | N : Node_Id; | |
196 | Msg : String; | |
197 | Biased : Boolean := True); | |
198 | -- If Biased is True, sets Has_Biased_Representation flag for E, and | |
199 | -- outputs a warning message at node N if Warn_On_Biased_Representation is | |
200 | -- is True. This warning inserts the string Msg to describe the construct | |
201 | -- causing biasing. | |
202 | ||
d6f39728 | 203 | ---------------------------------------------- |
204 | -- Table for Validate_Unchecked_Conversions -- | |
205 | ---------------------------------------------- | |
206 | ||
207 | -- The following table collects unchecked conversions for validation. | |
95deda50 | 208 | -- Entries are made by Validate_Unchecked_Conversion and then the call |
209 | -- to Validate_Unchecked_Conversions does the actual error checking and | |
210 | -- posting of warnings. The reason for this delayed processing is to take | |
211 | -- advantage of back-annotations of size and alignment values performed by | |
212 | -- the back end. | |
d6f39728 | 213 | |
95deda50 | 214 | -- Note: the reason we store a Source_Ptr value instead of a Node_Id is |
215 | -- that by the time Validate_Unchecked_Conversions is called, Sprint will | |
216 | -- already have modified all Sloc values if the -gnatD option is set. | |
299480f9 | 217 | |
d6f39728 | 218 | type UC_Entry is record |
86d32751 | 219 | Eloc : Source_Ptr; -- node used for posting warnings |
220 | Source : Entity_Id; -- source type for unchecked conversion | |
221 | Target : Entity_Id; -- target type for unchecked conversion | |
222 | Act_Unit : Entity_Id; -- actual function instantiated | |
d6f39728 | 223 | end record; |
224 | ||
225 | package Unchecked_Conversions is new Table.Table ( | |
226 | Table_Component_Type => UC_Entry, | |
227 | Table_Index_Type => Int, | |
228 | Table_Low_Bound => 1, | |
229 | Table_Initial => 50, | |
230 | Table_Increment => 200, | |
231 | Table_Name => "Unchecked_Conversions"); | |
232 | ||
83f8f0a6 | 233 | ---------------------------------------- |
234 | -- Table for Validate_Address_Clauses -- | |
235 | ---------------------------------------- | |
236 | ||
237 | -- If an address clause has the form | |
238 | ||
239 | -- for X'Address use Expr | |
240 | ||
95deda50 | 241 | -- where Expr is of the form Y'Address or recursively is a reference to a |
242 | -- constant of either of these forms, and X and Y are entities of objects, | |
243 | -- then if Y has a smaller alignment than X, that merits a warning about | |
244 | -- possible bad alignment. The following table collects address clauses of | |
245 | -- this kind. We put these in a table so that they can be checked after the | |
246 | -- back end has completed annotation of the alignments of objects, since we | |
247 | -- can catch more cases that way. | |
83f8f0a6 | 248 | |
249 | type Address_Clause_Check_Record is record | |
250 | N : Node_Id; | |
251 | -- The address clause | |
252 | ||
253 | X : Entity_Id; | |
254 | -- The entity of the object overlaying Y | |
255 | ||
256 | Y : Entity_Id; | |
257 | -- The entity of the object being overlaid | |
d6da7448 | 258 | |
259 | Off : Boolean; | |
6fb3c314 | 260 | -- Whether the address is offset within Y |
83f8f0a6 | 261 | end record; |
262 | ||
263 | package Address_Clause_Checks is new Table.Table ( | |
264 | Table_Component_Type => Address_Clause_Check_Record, | |
265 | Table_Index_Type => Int, | |
266 | Table_Low_Bound => 1, | |
267 | Table_Initial => 20, | |
268 | Table_Increment => 200, | |
269 | Table_Name => "Address_Clause_Checks"); | |
270 | ||
59ac57b5 | 271 | ----------------------------------------- |
272 | -- Adjust_Record_For_Reverse_Bit_Order -- | |
273 | ----------------------------------------- | |
274 | ||
275 | procedure Adjust_Record_For_Reverse_Bit_Order (R : Entity_Id) is | |
67278d60 | 276 | Comp : Node_Id; |
277 | CC : Node_Id; | |
59ac57b5 | 278 | |
279 | begin | |
67278d60 | 280 | -- Processing depends on version of Ada |
59ac57b5 | 281 | |
6797073f | 282 | -- For Ada 95, we just renumber bits within a storage unit. We do the |
568b0f6a | 283 | -- same for Ada 83 mode, since we recognize the Bit_Order attribute in |
ab19a652 | 284 | -- Ada 83, and are free to add this extension. |
6797073f | 285 | |
286 | if Ada_Version < Ada_2005 then | |
287 | Comp := First_Component_Or_Discriminant (R); | |
288 | while Present (Comp) loop | |
289 | CC := Component_Clause (Comp); | |
290 | ||
291 | -- If component clause is present, then deal with the non-default | |
292 | -- bit order case for Ada 95 mode. | |
293 | ||
294 | -- We only do this processing for the base type, and in fact that | |
295 | -- is important, since otherwise if there are record subtypes, we | |
296 | -- could reverse the bits once for each subtype, which is wrong. | |
297 | ||
b9e61b2a | 298 | if Present (CC) and then Ekind (R) = E_Record_Type then |
6797073f | 299 | declare |
300 | CFB : constant Uint := Component_Bit_Offset (Comp); | |
301 | CSZ : constant Uint := Esize (Comp); | |
302 | CLC : constant Node_Id := Component_Clause (Comp); | |
303 | Pos : constant Node_Id := Position (CLC); | |
304 | FB : constant Node_Id := First_Bit (CLC); | |
305 | ||
306 | Storage_Unit_Offset : constant Uint := | |
307 | CFB / System_Storage_Unit; | |
308 | ||
309 | Start_Bit : constant Uint := | |
310 | CFB mod System_Storage_Unit; | |
59ac57b5 | 311 | |
6797073f | 312 | begin |
313 | -- Cases where field goes over storage unit boundary | |
59ac57b5 | 314 | |
6797073f | 315 | if Start_Bit + CSZ > System_Storage_Unit then |
59ac57b5 | 316 | |
6797073f | 317 | -- Allow multi-byte field but generate warning |
59ac57b5 | 318 | |
6797073f | 319 | if Start_Bit mod System_Storage_Unit = 0 |
320 | and then CSZ mod System_Storage_Unit = 0 | |
321 | then | |
322 | Error_Msg_N | |
7a41db5b | 323 | ("info: multi-byte field specified with " |
324 | & "non-standard Bit_Order?V?", CLC); | |
31486bc0 | 325 | |
6797073f | 326 | if Bytes_Big_Endian then |
31486bc0 | 327 | Error_Msg_N |
7a41db5b | 328 | ("\bytes are not reversed " |
329 | & "(component is big-endian)?V?", CLC); | |
31486bc0 | 330 | else |
331 | Error_Msg_N | |
7a41db5b | 332 | ("\bytes are not reversed " |
333 | & "(component is little-endian)?V?", CLC); | |
31486bc0 | 334 | end if; |
59ac57b5 | 335 | |
6797073f | 336 | -- Do not allow non-contiguous field |
59ac57b5 | 337 | |
67278d60 | 338 | else |
6797073f | 339 | Error_Msg_N |
340 | ("attempt to specify non-contiguous field " | |
341 | & "not permitted", CLC); | |
342 | Error_Msg_N | |
343 | ("\caused by non-standard Bit_Order " | |
344 | & "specified", CLC); | |
345 | Error_Msg_N | |
346 | ("\consider possibility of using " | |
347 | & "Ada 2005 mode here", CLC); | |
348 | end if; | |
59ac57b5 | 349 | |
6797073f | 350 | -- Case where field fits in one storage unit |
59ac57b5 | 351 | |
6797073f | 352 | else |
353 | -- Give warning if suspicious component clause | |
59ac57b5 | 354 | |
6797073f | 355 | if Intval (FB) >= System_Storage_Unit |
356 | and then Warn_On_Reverse_Bit_Order | |
357 | then | |
358 | Error_Msg_N | |
7a41db5b | 359 | ("info: Bit_Order clause does not affect " & |
1e3532e7 | 360 | "byte ordering?V?", Pos); |
6797073f | 361 | Error_Msg_Uint_1 := |
362 | Intval (Pos) + Intval (FB) / | |
363 | System_Storage_Unit; | |
364 | Error_Msg_N | |
7a41db5b | 365 | ("info: position normalized to ^ before bit " & |
1e3532e7 | 366 | "order interpreted?V?", Pos); |
6797073f | 367 | end if; |
59ac57b5 | 368 | |
6797073f | 369 | -- Here is where we fix up the Component_Bit_Offset value |
370 | -- to account for the reverse bit order. Some examples of | |
371 | -- what needs to be done are: | |
bfa5a9d9 | 372 | |
6797073f | 373 | -- First_Bit .. Last_Bit Component_Bit_Offset |
374 | -- old new old new | |
59ac57b5 | 375 | |
6797073f | 376 | -- 0 .. 0 7 .. 7 0 7 |
377 | -- 0 .. 1 6 .. 7 0 6 | |
378 | -- 0 .. 2 5 .. 7 0 5 | |
379 | -- 0 .. 7 0 .. 7 0 4 | |
59ac57b5 | 380 | |
6797073f | 381 | -- 1 .. 1 6 .. 6 1 6 |
382 | -- 1 .. 4 3 .. 6 1 3 | |
383 | -- 4 .. 7 0 .. 3 4 0 | |
59ac57b5 | 384 | |
6797073f | 385 | -- The rule is that the first bit is is obtained by |
386 | -- subtracting the old ending bit from storage_unit - 1. | |
59ac57b5 | 387 | |
6797073f | 388 | Set_Component_Bit_Offset |
389 | (Comp, | |
390 | (Storage_Unit_Offset * System_Storage_Unit) + | |
391 | (System_Storage_Unit - 1) - | |
392 | (Start_Bit + CSZ - 1)); | |
59ac57b5 | 393 | |
6797073f | 394 | Set_Normalized_First_Bit |
395 | (Comp, | |
396 | Component_Bit_Offset (Comp) mod | |
397 | System_Storage_Unit); | |
398 | end if; | |
399 | end; | |
400 | end if; | |
401 | ||
402 | Next_Component_Or_Discriminant (Comp); | |
403 | end loop; | |
404 | ||
405 | -- For Ada 2005, we do machine scalar processing, as fully described In | |
406 | -- AI-133. This involves gathering all components which start at the | |
407 | -- same byte offset and processing them together. Same approach is still | |
408 | -- valid in later versions including Ada 2012. | |
409 | ||
410 | else | |
411 | declare | |
412 | Max_Machine_Scalar_Size : constant Uint := | |
413 | UI_From_Int | |
414 | (Standard_Long_Long_Integer_Size); | |
67278d60 | 415 | -- We use this as the maximum machine scalar size |
59ac57b5 | 416 | |
6797073f | 417 | Num_CC : Natural; |
418 | SSU : constant Uint := UI_From_Int (System_Storage_Unit); | |
59ac57b5 | 419 | |
6797073f | 420 | begin |
421 | -- This first loop through components does two things. First it | |
422 | -- deals with the case of components with component clauses whose | |
423 | -- length is greater than the maximum machine scalar size (either | |
424 | -- accepting them or rejecting as needed). Second, it counts the | |
425 | -- number of components with component clauses whose length does | |
426 | -- not exceed this maximum for later processing. | |
67278d60 | 427 | |
6797073f | 428 | Num_CC := 0; |
429 | Comp := First_Component_Or_Discriminant (R); | |
430 | while Present (Comp) loop | |
431 | CC := Component_Clause (Comp); | |
67278d60 | 432 | |
6797073f | 433 | if Present (CC) then |
434 | declare | |
1e3532e7 | 435 | Fbit : constant Uint := Static_Integer (First_Bit (CC)); |
436 | Lbit : constant Uint := Static_Integer (Last_Bit (CC)); | |
67278d60 | 437 | |
6797073f | 438 | begin |
b38e4131 | 439 | -- Case of component with last bit >= max machine scalar |
67278d60 | 440 | |
b38e4131 | 441 | if Lbit >= Max_Machine_Scalar_Size then |
67278d60 | 442 | |
b38e4131 | 443 | -- This is allowed only if first bit is zero, and |
444 | -- last bit + 1 is a multiple of storage unit size. | |
67278d60 | 445 | |
b38e4131 | 446 | if Fbit = 0 and then (Lbit + 1) mod SSU = 0 then |
67278d60 | 447 | |
b38e4131 | 448 | -- This is the case to give a warning if enabled |
67278d60 | 449 | |
b38e4131 | 450 | if Warn_On_Reverse_Bit_Order then |
451 | Error_Msg_N | |
7a41db5b | 452 | ("info: multi-byte field specified with " |
1e3532e7 | 453 | & " non-standard Bit_Order?V?", CC); |
b38e4131 | 454 | |
455 | if Bytes_Big_Endian then | |
456 | Error_Msg_N | |
457 | ("\bytes are not reversed " | |
1e3532e7 | 458 | & "(component is big-endian)?V?", CC); |
b38e4131 | 459 | else |
460 | Error_Msg_N | |
461 | ("\bytes are not reversed " | |
1e3532e7 | 462 | & "(component is little-endian)?V?", CC); |
b38e4131 | 463 | end if; |
464 | end if; | |
67278d60 | 465 | |
7eb0e22f | 466 | -- Give error message for RM 13.5.1(10) violation |
67278d60 | 467 | |
b38e4131 | 468 | else |
469 | Error_Msg_FE | |
470 | ("machine scalar rules not followed for&", | |
471 | First_Bit (CC), Comp); | |
67278d60 | 472 | |
b38e4131 | 473 | Error_Msg_Uint_1 := Lbit; |
474 | Error_Msg_Uint_2 := Max_Machine_Scalar_Size; | |
475 | Error_Msg_F | |
476 | ("\last bit (^) exceeds maximum machine " | |
477 | & "scalar size (^)", | |
478 | First_Bit (CC)); | |
67278d60 | 479 | |
b38e4131 | 480 | if (Lbit + 1) mod SSU /= 0 then |
481 | Error_Msg_Uint_1 := SSU; | |
482 | Error_Msg_F | |
483 | ("\and is not a multiple of Storage_Unit (^) " | |
0cafb066 | 484 | & "(RM 13.4.1(10))", |
b38e4131 | 485 | First_Bit (CC)); |
6797073f | 486 | |
6797073f | 487 | else |
b38e4131 | 488 | Error_Msg_Uint_1 := Fbit; |
489 | Error_Msg_F | |
490 | ("\and first bit (^) is non-zero " | |
0cafb066 | 491 | & "(RM 13.4.1(10))", |
b38e4131 | 492 | First_Bit (CC)); |
67278d60 | 493 | end if; |
6797073f | 494 | end if; |
59ac57b5 | 495 | |
b38e4131 | 496 | -- OK case of machine scalar related component clause, |
497 | -- For now, just count them. | |
59ac57b5 | 498 | |
6797073f | 499 | else |
500 | Num_CC := Num_CC + 1; | |
501 | end if; | |
502 | end; | |
503 | end if; | |
59ac57b5 | 504 | |
6797073f | 505 | Next_Component_Or_Discriminant (Comp); |
506 | end loop; | |
59ac57b5 | 507 | |
6797073f | 508 | -- We need to sort the component clauses on the basis of the |
509 | -- Position values in the clause, so we can group clauses with | |
4a87c513 | 510 | -- the same Position together to determine the relevant machine |
6797073f | 511 | -- scalar size. |
59ac57b5 | 512 | |
6797073f | 513 | Sort_CC : declare |
514 | Comps : array (0 .. Num_CC) of Entity_Id; | |
515 | -- Array to collect component and discriminant entities. The | |
516 | -- data starts at index 1, the 0'th entry is for the sort | |
517 | -- routine. | |
59ac57b5 | 518 | |
6797073f | 519 | function CP_Lt (Op1, Op2 : Natural) return Boolean; |
520 | -- Compare routine for Sort | |
59ac57b5 | 521 | |
6797073f | 522 | procedure CP_Move (From : Natural; To : Natural); |
523 | -- Move routine for Sort | |
59ac57b5 | 524 | |
6797073f | 525 | package Sorting is new GNAT.Heap_Sort_G (CP_Move, CP_Lt); |
59ac57b5 | 526 | |
6797073f | 527 | Start : Natural; |
528 | Stop : Natural; | |
529 | -- Start and stop positions in the component list of the set of | |
530 | -- components with the same starting position (that constitute | |
531 | -- components in a single machine scalar). | |
59ac57b5 | 532 | |
6797073f | 533 | MaxL : Uint; |
534 | -- Maximum last bit value of any component in this set | |
59ac57b5 | 535 | |
6797073f | 536 | MSS : Uint; |
537 | -- Corresponding machine scalar size | |
67278d60 | 538 | |
6797073f | 539 | ----------- |
540 | -- CP_Lt -- | |
541 | ----------- | |
67278d60 | 542 | |
6797073f | 543 | function CP_Lt (Op1, Op2 : Natural) return Boolean is |
544 | begin | |
545 | return Position (Component_Clause (Comps (Op1))) < | |
546 | Position (Component_Clause (Comps (Op2))); | |
547 | end CP_Lt; | |
67278d60 | 548 | |
6797073f | 549 | ------------- |
550 | -- CP_Move -- | |
551 | ------------- | |
67278d60 | 552 | |
6797073f | 553 | procedure CP_Move (From : Natural; To : Natural) is |
554 | begin | |
555 | Comps (To) := Comps (From); | |
556 | end CP_Move; | |
67278d60 | 557 | |
4a87c513 | 558 | -- Start of processing for Sort_CC |
59ac57b5 | 559 | |
6797073f | 560 | begin |
b38e4131 | 561 | -- Collect the machine scalar relevant component clauses |
59ac57b5 | 562 | |
6797073f | 563 | Num_CC := 0; |
564 | Comp := First_Component_Or_Discriminant (R); | |
565 | while Present (Comp) loop | |
b38e4131 | 566 | declare |
567 | CC : constant Node_Id := Component_Clause (Comp); | |
568 | ||
569 | begin | |
570 | -- Collect only component clauses whose last bit is less | |
571 | -- than machine scalar size. Any component clause whose | |
572 | -- last bit exceeds this value does not take part in | |
573 | -- machine scalar layout considerations. The test for | |
574 | -- Error_Posted makes sure we exclude component clauses | |
575 | -- for which we already posted an error. | |
576 | ||
577 | if Present (CC) | |
578 | and then not Error_Posted (Last_Bit (CC)) | |
579 | and then Static_Integer (Last_Bit (CC)) < | |
d64221a7 | 580 | Max_Machine_Scalar_Size |
b38e4131 | 581 | then |
582 | Num_CC := Num_CC + 1; | |
583 | Comps (Num_CC) := Comp; | |
584 | end if; | |
585 | end; | |
59ac57b5 | 586 | |
6797073f | 587 | Next_Component_Or_Discriminant (Comp); |
588 | end loop; | |
67278d60 | 589 | |
6797073f | 590 | -- Sort by ascending position number |
67278d60 | 591 | |
6797073f | 592 | Sorting.Sort (Num_CC); |
67278d60 | 593 | |
6797073f | 594 | -- We now have all the components whose size does not exceed |
595 | -- the max machine scalar value, sorted by starting position. | |
596 | -- In this loop we gather groups of clauses starting at the | |
597 | -- same position, to process them in accordance with AI-133. | |
67278d60 | 598 | |
6797073f | 599 | Stop := 0; |
600 | while Stop < Num_CC loop | |
601 | Start := Stop + 1; | |
602 | Stop := Start; | |
603 | MaxL := | |
604 | Static_Integer | |
605 | (Last_Bit (Component_Clause (Comps (Start)))); | |
67278d60 | 606 | while Stop < Num_CC loop |
6797073f | 607 | if Static_Integer |
608 | (Position (Component_Clause (Comps (Stop + 1)))) = | |
609 | Static_Integer | |
610 | (Position (Component_Clause (Comps (Stop)))) | |
611 | then | |
612 | Stop := Stop + 1; | |
613 | MaxL := | |
614 | UI_Max | |
615 | (MaxL, | |
616 | Static_Integer | |
617 | (Last_Bit | |
618 | (Component_Clause (Comps (Stop))))); | |
619 | else | |
620 | exit; | |
621 | end if; | |
622 | end loop; | |
67278d60 | 623 | |
6797073f | 624 | -- Now we have a group of component clauses from Start to |
625 | -- Stop whose positions are identical, and MaxL is the | |
626 | -- maximum last bit value of any of these components. | |
627 | ||
628 | -- We need to determine the corresponding machine scalar | |
629 | -- size. This loop assumes that machine scalar sizes are | |
630 | -- even, and that each possible machine scalar has twice | |
631 | -- as many bits as the next smaller one. | |
632 | ||
633 | MSS := Max_Machine_Scalar_Size; | |
634 | while MSS mod 2 = 0 | |
635 | and then (MSS / 2) >= SSU | |
636 | and then (MSS / 2) > MaxL | |
637 | loop | |
638 | MSS := MSS / 2; | |
639 | end loop; | |
67278d60 | 640 | |
6797073f | 641 | -- Here is where we fix up the Component_Bit_Offset value |
642 | -- to account for the reverse bit order. Some examples of | |
643 | -- what needs to be done for the case of a machine scalar | |
644 | -- size of 8 are: | |
67278d60 | 645 | |
6797073f | 646 | -- First_Bit .. Last_Bit Component_Bit_Offset |
647 | -- old new old new | |
67278d60 | 648 | |
6797073f | 649 | -- 0 .. 0 7 .. 7 0 7 |
650 | -- 0 .. 1 6 .. 7 0 6 | |
651 | -- 0 .. 2 5 .. 7 0 5 | |
652 | -- 0 .. 7 0 .. 7 0 4 | |
67278d60 | 653 | |
6797073f | 654 | -- 1 .. 1 6 .. 6 1 6 |
655 | -- 1 .. 4 3 .. 6 1 3 | |
656 | -- 4 .. 7 0 .. 3 4 0 | |
67278d60 | 657 | |
6797073f | 658 | -- The rule is that the first bit is obtained by subtracting |
659 | -- the old ending bit from machine scalar size - 1. | |
67278d60 | 660 | |
6797073f | 661 | for C in Start .. Stop loop |
662 | declare | |
663 | Comp : constant Entity_Id := Comps (C); | |
b9e61b2a | 664 | CC : constant Node_Id := Component_Clause (Comp); |
665 | ||
666 | LB : constant Uint := Static_Integer (Last_Bit (CC)); | |
6797073f | 667 | NFB : constant Uint := MSS - Uint_1 - LB; |
668 | NLB : constant Uint := NFB + Esize (Comp) - 1; | |
b9e61b2a | 669 | Pos : constant Uint := Static_Integer (Position (CC)); |
67278d60 | 670 | |
6797073f | 671 | begin |
672 | if Warn_On_Reverse_Bit_Order then | |
673 | Error_Msg_Uint_1 := MSS; | |
674 | Error_Msg_N | |
675 | ("info: reverse bit order in machine " & | |
1e3532e7 | 676 | "scalar of length^?V?", First_Bit (CC)); |
6797073f | 677 | Error_Msg_Uint_1 := NFB; |
678 | Error_Msg_Uint_2 := NLB; | |
679 | ||
680 | if Bytes_Big_Endian then | |
681 | Error_Msg_NE | |
7a41db5b | 682 | ("\big-endian range for component " |
683 | & "& is ^ .. ^?V?", First_Bit (CC), Comp); | |
6797073f | 684 | else |
685 | Error_Msg_NE | |
7a41db5b | 686 | ("\little-endian range for component" |
687 | & "& is ^ .. ^?V?", First_Bit (CC), Comp); | |
67278d60 | 688 | end if; |
6797073f | 689 | end if; |
67278d60 | 690 | |
6797073f | 691 | Set_Component_Bit_Offset (Comp, Pos * SSU + NFB); |
692 | Set_Normalized_First_Bit (Comp, NFB mod SSU); | |
693 | end; | |
67278d60 | 694 | end loop; |
6797073f | 695 | end loop; |
696 | end Sort_CC; | |
697 | end; | |
698 | end if; | |
59ac57b5 | 699 | end Adjust_Record_For_Reverse_Bit_Order; |
700 | ||
1d366b32 | 701 | ------------------------------------- |
702 | -- Alignment_Check_For_Size_Change -- | |
703 | ------------------------------------- | |
d6f39728 | 704 | |
1d366b32 | 705 | procedure Alignment_Check_For_Size_Change (Typ : Entity_Id; Size : Uint) is |
d6f39728 | 706 | begin |
707 | -- If the alignment is known, and not set by a rep clause, and is | |
708 | -- inconsistent with the size being set, then reset it to unknown, | |
709 | -- we assume in this case that the size overrides the inherited | |
710 | -- alignment, and that the alignment must be recomputed. | |
711 | ||
712 | if Known_Alignment (Typ) | |
713 | and then not Has_Alignment_Clause (Typ) | |
1d366b32 | 714 | and then Size mod (Alignment (Typ) * SSU) /= 0 |
d6f39728 | 715 | then |
716 | Init_Alignment (Typ); | |
717 | end if; | |
1d366b32 | 718 | end Alignment_Check_For_Size_Change; |
d6f39728 | 719 | |
06ef5f86 | 720 | ------------------------------------- |
721 | -- Analyze_Aspects_At_Freeze_Point -- | |
722 | ------------------------------------- | |
723 | ||
724 | procedure Analyze_Aspects_At_Freeze_Point (E : Entity_Id) is | |
725 | ASN : Node_Id; | |
726 | A_Id : Aspect_Id; | |
727 | Ritem : Node_Id; | |
728 | ||
729 | procedure Analyze_Aspect_Default_Value (ASN : Node_Id); | |
730 | -- This routine analyzes an Aspect_Default_[Component_]Value denoted by | |
731 | -- the aspect specification node ASN. | |
732 | ||
37c6e44c | 733 | procedure Inherit_Delayed_Rep_Aspects (ASN : Node_Id); |
734 | -- As discussed in the spec of Aspects (see Aspect_Delay declaration), | |
735 | -- a derived type can inherit aspects from its parent which have been | |
736 | -- specified at the time of the derivation using an aspect, as in: | |
737 | -- | |
738 | -- type A is range 1 .. 10 | |
739 | -- with Size => Not_Defined_Yet; | |
740 | -- .. | |
741 | -- type B is new A; | |
742 | -- .. | |
743 | -- Not_Defined_Yet : constant := 64; | |
744 | -- | |
745 | -- In this example, the Size of A is considered to be specified prior | |
746 | -- to the derivation, and thus inherited, even though the value is not | |
747 | -- known at the time of derivation. To deal with this, we use two entity | |
748 | -- flags. The flag Has_Derived_Rep_Aspects is set in the parent type (A | |
749 | -- here), and then the flag May_Inherit_Delayed_Rep_Aspects is set in | |
750 | -- the derived type (B here). If this flag is set when the derived type | |
751 | -- is frozen, then this procedure is called to ensure proper inheritance | |
b21edad9 | 752 | -- of all delayed aspects from the parent type. The derived type is E, |
37c6e44c | 753 | -- the argument to Analyze_Aspects_At_Freeze_Point. ASN is the first |
754 | -- aspect specification node in the Rep_Item chain for the parent type. | |
755 | ||
06ef5f86 | 756 | procedure Make_Pragma_From_Boolean_Aspect (ASN : Node_Id); |
757 | -- Given an aspect specification node ASN whose expression is an | |
758 | -- optional Boolean, this routines creates the corresponding pragma | |
759 | -- at the freezing point. | |
760 | ||
761 | ---------------------------------- | |
762 | -- Analyze_Aspect_Default_Value -- | |
763 | ---------------------------------- | |
764 | ||
765 | procedure Analyze_Aspect_Default_Value (ASN : Node_Id) is | |
766 | Ent : constant Entity_Id := Entity (ASN); | |
767 | Expr : constant Node_Id := Expression (ASN); | |
768 | Id : constant Node_Id := Identifier (ASN); | |
769 | ||
770 | begin | |
771 | Error_Msg_Name_1 := Chars (Id); | |
772 | ||
773 | if not Is_Type (Ent) then | |
774 | Error_Msg_N ("aspect% can only apply to a type", Id); | |
775 | return; | |
776 | ||
777 | elsif not Is_First_Subtype (Ent) then | |
778 | Error_Msg_N ("aspect% cannot apply to subtype", Id); | |
779 | return; | |
780 | ||
781 | elsif A_Id = Aspect_Default_Value | |
782 | and then not Is_Scalar_Type (Ent) | |
783 | then | |
784 | Error_Msg_N ("aspect% can only be applied to scalar type", Id); | |
785 | return; | |
786 | ||
787 | elsif A_Id = Aspect_Default_Component_Value then | |
788 | if not Is_Array_Type (Ent) then | |
789 | Error_Msg_N ("aspect% can only be applied to array type", Id); | |
790 | return; | |
791 | ||
792 | elsif not Is_Scalar_Type (Component_Type (Ent)) then | |
793 | Error_Msg_N ("aspect% requires scalar components", Id); | |
794 | return; | |
795 | end if; | |
796 | end if; | |
797 | ||
798 | Set_Has_Default_Aspect (Base_Type (Ent)); | |
799 | ||
800 | if Is_Scalar_Type (Ent) then | |
9f36e3fb | 801 | Set_Default_Aspect_Value (Base_Type (Ent), Expr); |
06ef5f86 | 802 | else |
f3d70f08 | 803 | Set_Default_Aspect_Component_Value (Base_Type (Ent), Expr); |
06ef5f86 | 804 | end if; |
805 | end Analyze_Aspect_Default_Value; | |
806 | ||
37c6e44c | 807 | --------------------------------- |
808 | -- Inherit_Delayed_Rep_Aspects -- | |
809 | --------------------------------- | |
810 | ||
811 | procedure Inherit_Delayed_Rep_Aspects (ASN : Node_Id) is | |
812 | P : constant Entity_Id := Entity (ASN); | |
813 | -- Entithy for parent type | |
814 | ||
815 | N : Node_Id; | |
816 | -- Item from Rep_Item chain | |
817 | ||
818 | A : Aspect_Id; | |
819 | ||
820 | begin | |
821 | -- Loop through delayed aspects for the parent type | |
822 | ||
823 | N := ASN; | |
824 | while Present (N) loop | |
825 | if Nkind (N) = N_Aspect_Specification then | |
826 | exit when Entity (N) /= P; | |
827 | ||
828 | if Is_Delayed_Aspect (N) then | |
829 | A := Get_Aspect_Id (Chars (Identifier (N))); | |
830 | ||
831 | -- Process delayed rep aspect. For Boolean attributes it is | |
832 | -- not possible to cancel an attribute once set (the attempt | |
833 | -- to use an aspect with xxx => False is an error) for a | |
834 | -- derived type. So for those cases, we do not have to check | |
835 | -- if a clause has been given for the derived type, since it | |
836 | -- is harmless to set it again if it is already set. | |
837 | ||
838 | case A is | |
839 | ||
840 | -- Alignment | |
841 | ||
842 | when Aspect_Alignment => | |
843 | if not Has_Alignment_Clause (E) then | |
844 | Set_Alignment (E, Alignment (P)); | |
845 | end if; | |
846 | ||
847 | -- Atomic | |
848 | ||
849 | when Aspect_Atomic => | |
850 | if Is_Atomic (P) then | |
851 | Set_Is_Atomic (E); | |
852 | end if; | |
853 | ||
854 | -- Atomic_Components | |
855 | ||
856 | when Aspect_Atomic_Components => | |
857 | if Has_Atomic_Components (P) then | |
858 | Set_Has_Atomic_Components (Base_Type (E)); | |
859 | end if; | |
860 | ||
861 | -- Bit_Order | |
862 | ||
863 | when Aspect_Bit_Order => | |
864 | if Is_Record_Type (E) | |
865 | and then No (Get_Attribute_Definition_Clause | |
866 | (E, Attribute_Bit_Order)) | |
867 | and then Reverse_Bit_Order (P) | |
868 | then | |
869 | Set_Reverse_Bit_Order (Base_Type (E)); | |
870 | end if; | |
871 | ||
872 | -- Component_Size | |
873 | ||
874 | when Aspect_Component_Size => | |
875 | if Is_Array_Type (E) | |
876 | and then not Has_Component_Size_Clause (E) | |
877 | then | |
878 | Set_Component_Size | |
879 | (Base_Type (E), Component_Size (P)); | |
880 | end if; | |
881 | ||
882 | -- Machine_Radix | |
883 | ||
884 | when Aspect_Machine_Radix => | |
885 | if Is_Decimal_Fixed_Point_Type (E) | |
886 | and then not Has_Machine_Radix_Clause (E) | |
887 | then | |
888 | Set_Machine_Radix_10 (E, Machine_Radix_10 (P)); | |
889 | end if; | |
890 | ||
891 | -- Object_Size (also Size which also sets Object_Size) | |
892 | ||
893 | when Aspect_Object_Size | Aspect_Size => | |
894 | if not Has_Size_Clause (E) | |
895 | and then | |
896 | No (Get_Attribute_Definition_Clause | |
897 | (E, Attribute_Object_Size)) | |
898 | then | |
899 | Set_Esize (E, Esize (P)); | |
900 | end if; | |
901 | ||
902 | -- Pack | |
903 | ||
904 | when Aspect_Pack => | |
905 | if not Is_Packed (E) then | |
906 | Set_Is_Packed (Base_Type (E)); | |
907 | ||
908 | if Is_Bit_Packed_Array (P) then | |
909 | Set_Is_Bit_Packed_Array (Base_Type (E)); | |
a88a5773 | 910 | Set_Packed_Array_Impl_Type |
911 | (E, Packed_Array_Impl_Type (P)); | |
37c6e44c | 912 | end if; |
913 | end if; | |
914 | ||
915 | -- Scalar_Storage_Order | |
916 | ||
917 | when Aspect_Scalar_Storage_Order => | |
918 | if (Is_Record_Type (E) or else Is_Array_Type (E)) | |
919 | and then No (Get_Attribute_Definition_Clause | |
e163cac8 | 920 | (E, Attribute_Scalar_Storage_Order)) |
37c6e44c | 921 | and then Reverse_Storage_Order (P) |
922 | then | |
923 | Set_Reverse_Storage_Order (Base_Type (E)); | |
b64082f2 | 924 | |
925 | -- Clear default SSO indications, since the aspect | |
926 | -- overrides the default. | |
927 | ||
928 | Set_SSO_Set_Low_By_Default (Base_Type (E), False); | |
929 | Set_SSO_Set_High_By_Default (Base_Type (E), False); | |
37c6e44c | 930 | end if; |
931 | ||
932 | -- Small | |
933 | ||
934 | when Aspect_Small => | |
935 | if Is_Fixed_Point_Type (E) | |
936 | and then not Has_Small_Clause (E) | |
937 | then | |
938 | Set_Small_Value (E, Small_Value (P)); | |
939 | end if; | |
940 | ||
941 | -- Storage_Size | |
942 | ||
943 | when Aspect_Storage_Size => | |
944 | if (Is_Access_Type (E) or else Is_Task_Type (E)) | |
945 | and then not Has_Storage_Size_Clause (E) | |
946 | then | |
947 | Set_Storage_Size_Variable | |
948 | (Base_Type (E), Storage_Size_Variable (P)); | |
949 | end if; | |
950 | ||
951 | -- Value_Size | |
952 | ||
953 | when Aspect_Value_Size => | |
954 | ||
955 | -- Value_Size is never inherited, it is either set by | |
956 | -- default, or it is explicitly set for the derived | |
957 | -- type. So nothing to do here. | |
958 | ||
959 | null; | |
960 | ||
961 | -- Volatile | |
962 | ||
963 | when Aspect_Volatile => | |
964 | if Is_Volatile (P) then | |
965 | Set_Is_Volatile (E); | |
966 | end if; | |
967 | ||
2fe893b9 | 968 | -- Volatile_Full_Access |
969 | ||
970 | when Aspect_Volatile_Full_Access => | |
971 | if Has_Volatile_Full_Access (P) then | |
972 | Set_Has_Volatile_Full_Access (E); | |
973 | end if; | |
974 | ||
37c6e44c | 975 | -- Volatile_Components |
976 | ||
977 | when Aspect_Volatile_Components => | |
978 | if Has_Volatile_Components (P) then | |
979 | Set_Has_Volatile_Components (Base_Type (E)); | |
980 | end if; | |
981 | ||
982 | -- That should be all the Rep Aspects | |
983 | ||
984 | when others => | |
985 | pragma Assert (Aspect_Delay (A_Id) /= Rep_Aspect); | |
986 | null; | |
987 | ||
988 | end case; | |
989 | end if; | |
990 | end if; | |
991 | ||
992 | N := Next_Rep_Item (N); | |
993 | end loop; | |
994 | end Inherit_Delayed_Rep_Aspects; | |
995 | ||
06ef5f86 | 996 | ------------------------------------- |
997 | -- Make_Pragma_From_Boolean_Aspect -- | |
998 | ------------------------------------- | |
999 | ||
1000 | procedure Make_Pragma_From_Boolean_Aspect (ASN : Node_Id) is | |
1001 | Ident : constant Node_Id := Identifier (ASN); | |
1002 | A_Name : constant Name_Id := Chars (Ident); | |
1003 | A_Id : constant Aspect_Id := Get_Aspect_Id (A_Name); | |
1004 | Ent : constant Entity_Id := Entity (ASN); | |
1005 | Expr : constant Node_Id := Expression (ASN); | |
1006 | Loc : constant Source_Ptr := Sloc (ASN); | |
1007 | ||
1008 | Prag : Node_Id; | |
1009 | ||
1010 | procedure Check_False_Aspect_For_Derived_Type; | |
1011 | -- This procedure checks for the case of a false aspect for a derived | |
1012 | -- type, which improperly tries to cancel an aspect inherited from | |
1013 | -- the parent. | |
1014 | ||
1015 | ----------------------------------------- | |
1016 | -- Check_False_Aspect_For_Derived_Type -- | |
1017 | ----------------------------------------- | |
1018 | ||
1019 | procedure Check_False_Aspect_For_Derived_Type is | |
1020 | Par : Node_Id; | |
1021 | ||
1022 | begin | |
1023 | -- We are only checking derived types | |
1024 | ||
1025 | if not Is_Derived_Type (E) then | |
1026 | return; | |
1027 | end if; | |
1028 | ||
1029 | Par := Nearest_Ancestor (E); | |
1030 | ||
1031 | case A_Id is | |
1032 | when Aspect_Atomic | Aspect_Shared => | |
1033 | if not Is_Atomic (Par) then | |
1034 | return; | |
1035 | end if; | |
1036 | ||
1037 | when Aspect_Atomic_Components => | |
1038 | if not Has_Atomic_Components (Par) then | |
1039 | return; | |
1040 | end if; | |
1041 | ||
1042 | when Aspect_Discard_Names => | |
1043 | if not Discard_Names (Par) then | |
1044 | return; | |
1045 | end if; | |
1046 | ||
1047 | when Aspect_Pack => | |
1048 | if not Is_Packed (Par) then | |
1049 | return; | |
1050 | end if; | |
1051 | ||
1052 | when Aspect_Unchecked_Union => | |
1053 | if not Is_Unchecked_Union (Par) then | |
1054 | return; | |
1055 | end if; | |
1056 | ||
1057 | when Aspect_Volatile => | |
1058 | if not Is_Volatile (Par) then | |
1059 | return; | |
1060 | end if; | |
1061 | ||
1062 | when Aspect_Volatile_Components => | |
1063 | if not Has_Volatile_Components (Par) then | |
1064 | return; | |
1065 | end if; | |
1066 | ||
2fe893b9 | 1067 | when Aspect_Volatile_Full_Access => |
1068 | if not Has_Volatile_Full_Access (Par) then | |
1069 | return; | |
1070 | end if; | |
1071 | ||
06ef5f86 | 1072 | when others => |
1073 | return; | |
1074 | end case; | |
1075 | ||
1076 | -- Fall through means we are canceling an inherited aspect | |
1077 | ||
1078 | Error_Msg_Name_1 := A_Name; | |
37c6e44c | 1079 | Error_Msg_NE |
1080 | ("derived type& inherits aspect%, cannot cancel", Expr, E); | |
06ef5f86 | 1081 | end Check_False_Aspect_For_Derived_Type; |
1082 | ||
1083 | -- Start of processing for Make_Pragma_From_Boolean_Aspect | |
1084 | ||
1085 | begin | |
37c6e44c | 1086 | -- Note that we know Expr is present, because for a missing Expr |
1087 | -- argument, we knew it was True and did not need to delay the | |
1088 | -- evaluation to the freeze point. | |
1089 | ||
06ef5f86 | 1090 | if Is_False (Static_Boolean (Expr)) then |
1091 | Check_False_Aspect_For_Derived_Type; | |
1092 | ||
1093 | else | |
1094 | Prag := | |
1095 | Make_Pragma (Loc, | |
1096 | Pragma_Argument_Associations => New_List ( | |
57cd943b | 1097 | Make_Pragma_Argument_Association (Sloc (Ident), |
1098 | Expression => New_Occurrence_Of (Ent, Sloc (Ident)))), | |
1099 | ||
06ef5f86 | 1100 | Pragma_Identifier => |
1101 | Make_Identifier (Sloc (Ident), Chars (Ident))); | |
1102 | ||
1103 | Set_From_Aspect_Specification (Prag, True); | |
1104 | Set_Corresponding_Aspect (Prag, ASN); | |
1105 | Set_Aspect_Rep_Item (ASN, Prag); | |
1106 | Set_Is_Delayed_Aspect (Prag); | |
1107 | Set_Parent (Prag, ASN); | |
1108 | end if; | |
06ef5f86 | 1109 | end Make_Pragma_From_Boolean_Aspect; |
1110 | ||
1111 | -- Start of processing for Analyze_Aspects_At_Freeze_Point | |
1112 | ||
1113 | begin | |
29a9d4be | 1114 | -- Must be visible in current scope |
06ef5f86 | 1115 | |
ace3389d | 1116 | if not Scope_Within_Or_Same (Current_Scope, Scope (E)) then |
06ef5f86 | 1117 | return; |
1118 | end if; | |
1119 | ||
1120 | -- Look for aspect specification entries for this entity | |
1121 | ||
1122 | ASN := First_Rep_Item (E); | |
06ef5f86 | 1123 | while Present (ASN) loop |
37c6e44c | 1124 | if Nkind (ASN) = N_Aspect_Specification then |
1125 | exit when Entity (ASN) /= E; | |
06ef5f86 | 1126 | |
37c6e44c | 1127 | if Is_Delayed_Aspect (ASN) then |
1128 | A_Id := Get_Aspect_Id (ASN); | |
1129 | ||
1130 | case A_Id is | |
e4c87fa5 | 1131 | |
37c6e44c | 1132 | -- For aspects whose expression is an optional Boolean, make |
7d6fb253 | 1133 | -- the corresponding pragma at the freeze point. |
06ef5f86 | 1134 | |
7d6fb253 | 1135 | when Boolean_Aspects | |
1136 | Library_Unit_Aspects => | |
1137 | Make_Pragma_From_Boolean_Aspect (ASN); | |
06ef5f86 | 1138 | |
37c6e44c | 1139 | -- Special handling for aspects that don't correspond to |
1140 | -- pragmas/attributes. | |
06ef5f86 | 1141 | |
7d6fb253 | 1142 | when Aspect_Default_Value | |
1143 | Aspect_Default_Component_Value => | |
81c2bc19 | 1144 | |
1145 | -- Do not inherit aspect for anonymous base type of a | |
1146 | -- scalar or array type, because they apply to the first | |
1147 | -- subtype of the type, and will be processed when that | |
1148 | -- first subtype is frozen. | |
1149 | ||
1150 | if Is_Derived_Type (E) | |
1151 | and then not Comes_From_Source (E) | |
1152 | and then E /= First_Subtype (E) | |
1153 | then | |
1154 | null; | |
1155 | else | |
1156 | Analyze_Aspect_Default_Value (ASN); | |
1157 | end if; | |
06ef5f86 | 1158 | |
37c6e44c | 1159 | -- Ditto for iterator aspects, because the corresponding |
1160 | -- attributes may not have been analyzed yet. | |
af9fed8f | 1161 | |
7d6fb253 | 1162 | when Aspect_Constant_Indexing | |
1163 | Aspect_Variable_Indexing | | |
1164 | Aspect_Default_Iterator | | |
1165 | Aspect_Iterator_Element => | |
1166 | Analyze (Expression (ASN)); | |
af9fed8f | 1167 | |
7d6fb253 | 1168 | if Etype (Expression (ASN)) = Any_Type then |
1169 | Error_Msg_NE | |
1170 | ("\aspect must be fully defined before & is frozen", | |
1171 | ASN, E); | |
1172 | end if; | |
b3f8228a | 1173 | |
7d6fb253 | 1174 | when Aspect_Iterable => |
1175 | Validate_Iterable_Aspect (E, ASN); | |
1176 | ||
1177 | when others => | |
1178 | null; | |
37c6e44c | 1179 | end case; |
06ef5f86 | 1180 | |
37c6e44c | 1181 | Ritem := Aspect_Rep_Item (ASN); |
06ef5f86 | 1182 | |
37c6e44c | 1183 | if Present (Ritem) then |
1184 | Analyze (Ritem); | |
1185 | end if; | |
06ef5f86 | 1186 | end if; |
1187 | end if; | |
1188 | ||
1189 | Next_Rep_Item (ASN); | |
1190 | end loop; | |
37c6e44c | 1191 | |
1192 | -- This is where we inherit delayed rep aspects from our parent. Note | |
1193 | -- that if we fell out of the above loop with ASN non-empty, it means | |
1194 | -- we hit an aspect for an entity other than E, and it must be the | |
1195 | -- type from which we were derived. | |
1196 | ||
1197 | if May_Inherit_Delayed_Rep_Aspects (E) then | |
1198 | Inherit_Delayed_Rep_Aspects (ASN); | |
1199 | end if; | |
06ef5f86 | 1200 | end Analyze_Aspects_At_Freeze_Point; |
1201 | ||
ae888dbd | 1202 | ----------------------------------- |
1203 | -- Analyze_Aspect_Specifications -- | |
1204 | ----------------------------------- | |
1205 | ||
21ea3a4f | 1206 | procedure Analyze_Aspect_Specifications (N : Node_Id; E : Entity_Id) is |
e2bf777d | 1207 | procedure Decorate (Asp : Node_Id; Prag : Node_Id); |
c4369687 | 1208 | -- Establish linkages between an aspect and its corresponding |
e2bf777d | 1209 | -- pragma. |
5ddd846b | 1210 | |
50e44732 | 1211 | procedure Insert_After_SPARK_Mode |
1212 | (Prag : Node_Id; | |
1213 | Ins_Nod : Node_Id; | |
1214 | Decls : List_Id); | |
3dbe7a69 | 1215 | -- Subsidiary to the analysis of aspects Abstract_State, Ghost, |
1216 | -- Initializes, Initial_Condition and Refined_State. Insert node Prag | |
1217 | -- before node Ins_Nod. If Ins_Nod is for pragma SPARK_Mode, then skip | |
1218 | -- SPARK_Mode. Decls is the associated declarative list where Prag is to | |
1219 | -- reside. | |
e2bf777d | 1220 | |
1221 | procedure Insert_Pragma (Prag : Node_Id); | |
1222 | -- Subsidiary to the analysis of aspects Attach_Handler, Contract_Cases, | |
1223 | -- Depends, Global, Post, Pre, Refined_Depends and Refined_Global. | |
1224 | -- Insert pragma Prag such that it mimics the placement of a source | |
1225 | -- pragma of the same kind. | |
1226 | -- | |
1227 | -- procedure Proc (Formal : ...) with Global => ...; | |
1228 | -- | |
1229 | -- procedure Proc (Formal : ...); | |
1230 | -- pragma Global (...); | |
1231 | ||
1232 | -------------- | |
1233 | -- Decorate -- | |
1234 | -------------- | |
1235 | ||
1236 | procedure Decorate (Asp : Node_Id; Prag : Node_Id) is | |
5ddd846b | 1237 | begin |
5cc6f0cf | 1238 | Set_Aspect_Rep_Item (Asp, Prag); |
5ddd846b | 1239 | Set_Corresponding_Aspect (Prag, Asp); |
1240 | Set_From_Aspect_Specification (Prag); | |
5ddd846b | 1241 | Set_Parent (Prag, Asp); |
e2bf777d | 1242 | end Decorate; |
f0813d71 | 1243 | |
50e44732 | 1244 | ----------------------------- |
1245 | -- Insert_After_SPARK_Mode -- | |
1246 | ----------------------------- | |
1247 | ||
1248 | procedure Insert_After_SPARK_Mode | |
1249 | (Prag : Node_Id; | |
1250 | Ins_Nod : Node_Id; | |
1251 | Decls : List_Id) | |
1252 | is | |
1253 | Decl : Node_Id := Ins_Nod; | |
1254 | ||
1255 | begin | |
1256 | -- Skip SPARK_Mode | |
1257 | ||
1258 | if Present (Decl) | |
1259 | and then Nkind (Decl) = N_Pragma | |
1260 | and then Pragma_Name (Decl) = Name_SPARK_Mode | |
1261 | then | |
1262 | Decl := Next (Decl); | |
1263 | end if; | |
1264 | ||
1265 | if Present (Decl) then | |
1266 | Insert_Before (Decl, Prag); | |
1267 | ||
1268 | -- Aitem acts as the last declaration | |
1269 | ||
1270 | else | |
1271 | Append_To (Decls, Prag); | |
1272 | end if; | |
1273 | end Insert_After_SPARK_Mode; | |
1274 | ||
e2bf777d | 1275 | ------------------- |
1276 | -- Insert_Pragma -- | |
1277 | ------------------- | |
c1006d6d | 1278 | |
e2bf777d | 1279 | procedure Insert_Pragma (Prag : Node_Id) is |
1280 | Aux : Node_Id; | |
1281 | Decl : Node_Id; | |
c1006d6d | 1282 | |
1283 | begin | |
ed695684 | 1284 | if Nkind (N) = N_Subprogram_Body then |
e2bf777d | 1285 | if Present (Declarations (N)) then |
d324c418 | 1286 | |
e2bf777d | 1287 | -- Skip other internally generated pragmas from aspects to find |
1288 | -- the proper insertion point. As a result the order of pragmas | |
1289 | -- is the same as the order of aspects. | |
d324c418 | 1290 | |
607bc8f5 | 1291 | -- As precondition pragmas generated from conjuncts in the |
1292 | -- precondition aspect are presented in reverse order to | |
1293 | -- Insert_Pragma, insert them in the correct order here by not | |
1294 | -- skipping previously inserted precondition pragmas when the | |
1295 | -- current pragma is a precondition. | |
1296 | ||
e2bf777d | 1297 | Decl := First (Declarations (N)); |
1298 | while Present (Decl) loop | |
1299 | if Nkind (Decl) = N_Pragma | |
1300 | and then From_Aspect_Specification (Decl) | |
607bc8f5 | 1301 | and then not (Get_Pragma_Id (Decl) = Pragma_Precondition |
1302 | and then | |
1303 | Get_Pragma_Id (Prag) = Pragma_Precondition) | |
e2bf777d | 1304 | then |
1305 | Next (Decl); | |
d324c418 | 1306 | else |
e2bf777d | 1307 | exit; |
d324c418 | 1308 | end if; |
e2bf777d | 1309 | end loop; |
1310 | ||
1311 | if Present (Decl) then | |
1312 | Insert_Before (Decl, Prag); | |
1313 | else | |
1314 | Append (Prag, Declarations (N)); | |
1315 | end if; | |
1316 | else | |
1317 | Set_Declarations (N, New_List (Prag)); | |
d324c418 | 1318 | end if; |
c1006d6d | 1319 | |
ed695684 | 1320 | -- When the context is a library unit, the pragma is added to the |
1321 | -- Pragmas_After list. | |
1322 | ||
1323 | elsif Nkind (Parent (N)) = N_Compilation_Unit then | |
1324 | Aux := Aux_Decls_Node (Parent (N)); | |
1325 | ||
1326 | if No (Pragmas_After (Aux)) then | |
1327 | Set_Pragmas_After (Aux, New_List); | |
1328 | end if; | |
1329 | ||
1330 | Prepend (Prag, Pragmas_After (Aux)); | |
1331 | ||
c1006d6d | 1332 | -- Default |
1333 | ||
1334 | else | |
1335 | Insert_After (N, Prag); | |
c1006d6d | 1336 | end if; |
e2bf777d | 1337 | end Insert_Pragma; |
c1006d6d | 1338 | |
1339 | -- Local variables | |
1340 | ||
ae888dbd | 1341 | Aspect : Node_Id; |
d74fc39a | 1342 | Aitem : Node_Id; |
ae888dbd | 1343 | Ent : Node_Id; |
ae888dbd | 1344 | |
21ea3a4f | 1345 | L : constant List_Id := Aspect_Specifications (N); |
1346 | ||
ae888dbd | 1347 | Ins_Node : Node_Id := N; |
89f1e35c | 1348 | -- Insert pragmas/attribute definition clause after this node when no |
1349 | -- delayed analysis is required. | |
d74fc39a | 1350 | |
f0813d71 | 1351 | -- Start of processing for Analyze_Aspect_Specifications |
1352 | ||
d74fc39a | 1353 | -- The general processing involves building an attribute definition |
89f1e35c | 1354 | -- clause or a pragma node that corresponds to the aspect. Then in order |
1355 | -- to delay the evaluation of this aspect to the freeze point, we attach | |
1356 | -- the corresponding pragma/attribute definition clause to the aspect | |
1357 | -- specification node, which is then placed in the Rep Item chain. In | |
1358 | -- this case we mark the entity by setting the flag Has_Delayed_Aspects | |
1359 | -- and we evaluate the rep item at the freeze point. When the aspect | |
1360 | -- doesn't have a corresponding pragma/attribute definition clause, then | |
1361 | -- its analysis is simply delayed at the freeze point. | |
1362 | ||
1363 | -- Some special cases don't require delay analysis, thus the aspect is | |
1364 | -- analyzed right now. | |
1365 | ||
51ea9c94 | 1366 | -- Note that there is a special handling for Pre, Post, Test_Case, |
e66f4e2a | 1367 | -- Contract_Cases aspects. In these cases, we do not have to worry |
51ea9c94 | 1368 | -- about delay issues, since the pragmas themselves deal with delay |
1369 | -- of visibility for the expression analysis. Thus, we just insert | |
1370 | -- the pragma after the node N. | |
ae888dbd | 1371 | |
1372 | begin | |
21ea3a4f | 1373 | pragma Assert (Present (L)); |
1374 | ||
6fb3c314 | 1375 | -- Loop through aspects |
f93e7257 | 1376 | |
ae888dbd | 1377 | Aspect := First (L); |
21ea3a4f | 1378 | Aspect_Loop : while Present (Aspect) loop |
0fd13d32 | 1379 | Analyze_One_Aspect : declare |
94153a42 | 1380 | Expr : constant Node_Id := Expression (Aspect); |
89f1e35c | 1381 | Id : constant Node_Id := Identifier (Aspect); |
1382 | Loc : constant Source_Ptr := Sloc (Aspect); | |
94153a42 | 1383 | Nam : constant Name_Id := Chars (Id); |
1384 | A_Id : constant Aspect_Id := Get_Aspect_Id (Nam); | |
ae888dbd | 1385 | Anod : Node_Id; |
1386 | ||
37c6e44c | 1387 | Delay_Required : Boolean; |
89f1e35c | 1388 | -- Set False if delay is not required |
1389 | ||
c0793fff | 1390 | Eloc : Source_Ptr := No_Location; |
1391 | -- Source location of expression, modified when we split PPC's. It | |
1392 | -- is set below when Expr is present. | |
39e1f22f | 1393 | |
89f1e35c | 1394 | procedure Analyze_Aspect_External_Or_Link_Name; |
0fd13d32 | 1395 | -- Perform analysis of the External_Name or Link_Name aspects |
21ea3a4f | 1396 | |
89f1e35c | 1397 | procedure Analyze_Aspect_Implicit_Dereference; |
9ab32fe9 | 1398 | -- Perform analysis of the Implicit_Dereference aspects |
0fd13d32 | 1399 | |
1400 | procedure Make_Aitem_Pragma | |
1401 | (Pragma_Argument_Associations : List_Id; | |
1402 | Pragma_Name : Name_Id); | |
1403 | -- This is a wrapper for Make_Pragma used for converting aspects | |
1404 | -- to pragmas. It takes care of Sloc (set from Loc) and building | |
1405 | -- the pragma identifier from the given name. In addition the | |
1406 | -- flags Class_Present and Split_PPC are set from the aspect | |
1407 | -- node, as well as Is_Ignored. This routine also sets the | |
1408 | -- From_Aspect_Specification in the resulting pragma node to | |
1409 | -- True, and sets Corresponding_Aspect to point to the aspect. | |
1410 | -- The resulting pragma is assigned to Aitem. | |
21ea3a4f | 1411 | |
89f1e35c | 1412 | ------------------------------------------ |
1413 | -- Analyze_Aspect_External_Or_Link_Name -- | |
1414 | ------------------------------------------ | |
1415 | ||
1416 | procedure Analyze_Aspect_External_Or_Link_Name is | |
21ea3a4f | 1417 | begin |
89f1e35c | 1418 | -- Verify that there is an Import/Export aspect defined for the |
1419 | -- entity. The processing of that aspect in turn checks that | |
1420 | -- there is a Convention aspect declared. The pragma is | |
1421 | -- constructed when processing the Convention aspect. | |
21ea3a4f | 1422 | |
89f1e35c | 1423 | declare |
1424 | A : Node_Id; | |
21ea3a4f | 1425 | |
89f1e35c | 1426 | begin |
1427 | A := First (L); | |
89f1e35c | 1428 | while Present (A) loop |
18393965 | 1429 | exit when Nam_In (Chars (Identifier (A)), Name_Export, |
1430 | Name_Import); | |
89f1e35c | 1431 | Next (A); |
1432 | end loop; | |
21ea3a4f | 1433 | |
89f1e35c | 1434 | if No (A) then |
1435 | Error_Msg_N | |
51ea9c94 | 1436 | ("missing Import/Export for Link/External name", |
8a1e3cde | 1437 | Aspect); |
89f1e35c | 1438 | end if; |
1439 | end; | |
1440 | end Analyze_Aspect_External_Or_Link_Name; | |
21ea3a4f | 1441 | |
89f1e35c | 1442 | ----------------------------------------- |
1443 | -- Analyze_Aspect_Implicit_Dereference -- | |
1444 | ----------------------------------------- | |
21ea3a4f | 1445 | |
89f1e35c | 1446 | procedure Analyze_Aspect_Implicit_Dereference is |
1447 | begin | |
b9e61b2a | 1448 | if not Is_Type (E) or else not Has_Discriminants (E) then |
89f1e35c | 1449 | Error_Msg_N |
51ea9c94 | 1450 | ("aspect must apply to a type with discriminants", N); |
21ea3a4f | 1451 | |
89f1e35c | 1452 | else |
1453 | declare | |
1454 | Disc : Entity_Id; | |
21ea3a4f | 1455 | |
89f1e35c | 1456 | begin |
1457 | Disc := First_Discriminant (E); | |
89f1e35c | 1458 | while Present (Disc) loop |
1459 | if Chars (Expr) = Chars (Disc) | |
1460 | and then Ekind (Etype (Disc)) = | |
1461 | E_Anonymous_Access_Type | |
1462 | then | |
1463 | Set_Has_Implicit_Dereference (E); | |
1464 | Set_Has_Implicit_Dereference (Disc); | |
1465 | return; | |
1466 | end if; | |
21ea3a4f | 1467 | |
89f1e35c | 1468 | Next_Discriminant (Disc); |
1469 | end loop; | |
21ea3a4f | 1470 | |
89f1e35c | 1471 | -- Error if no proper access discriminant. |
21ea3a4f | 1472 | |
89f1e35c | 1473 | Error_Msg_NE |
1474 | ("not an access discriminant of&", Expr, E); | |
1475 | end; | |
1476 | end if; | |
1477 | end Analyze_Aspect_Implicit_Dereference; | |
21ea3a4f | 1478 | |
0fd13d32 | 1479 | ----------------------- |
1480 | -- Make_Aitem_Pragma -- | |
1481 | ----------------------- | |
1482 | ||
1483 | procedure Make_Aitem_Pragma | |
1484 | (Pragma_Argument_Associations : List_Id; | |
1485 | Pragma_Name : Name_Id) | |
1486 | is | |
b855559d | 1487 | Args : List_Id := Pragma_Argument_Associations; |
1488 | ||
0fd13d32 | 1489 | begin |
1490 | -- We should never get here if aspect was disabled | |
1491 | ||
1492 | pragma Assert (not Is_Disabled (Aspect)); | |
1493 | ||
056dc987 | 1494 | -- Certain aspects allow for an optional name or expression. Do |
1495 | -- not generate a pragma with empty argument association list. | |
b855559d | 1496 | |
1497 | if No (Args) or else No (Expression (First (Args))) then | |
1498 | Args := No_List; | |
1499 | end if; | |
1500 | ||
0fd13d32 | 1501 | -- Build the pragma |
1502 | ||
1503 | Aitem := | |
1504 | Make_Pragma (Loc, | |
b855559d | 1505 | Pragma_Argument_Associations => Args, |
0fd13d32 | 1506 | Pragma_Identifier => |
1507 | Make_Identifier (Sloc (Id), Pragma_Name), | |
9ab32fe9 | 1508 | Class_Present => Class_Present (Aspect), |
1509 | Split_PPC => Split_PPC (Aspect)); | |
0fd13d32 | 1510 | |
1511 | -- Set additional semantic fields | |
1512 | ||
1513 | if Is_Ignored (Aspect) then | |
1514 | Set_Is_Ignored (Aitem); | |
57d8d1f3 | 1515 | elsif Is_Checked (Aspect) then |
a5109493 | 1516 | Set_Is_Checked (Aitem); |
0fd13d32 | 1517 | end if; |
1518 | ||
1519 | Set_Corresponding_Aspect (Aitem, Aspect); | |
1520 | Set_From_Aspect_Specification (Aitem, True); | |
1521 | end Make_Aitem_Pragma; | |
1522 | ||
1523 | -- Start of processing for Analyze_One_Aspect | |
1524 | ||
ae888dbd | 1525 | begin |
2d1acfa7 | 1526 | -- Skip aspect if already analyzed, to avoid looping in some cases |
fb7f2fc4 | 1527 | |
1528 | if Analyzed (Aspect) then | |
1529 | goto Continue; | |
1530 | end if; | |
1531 | ||
ef957022 | 1532 | -- Skip looking at aspect if it is totally disabled. Just mark it |
1533 | -- as such for later reference in the tree. This also sets the | |
1534 | -- Is_Ignored and Is_Checked flags appropriately. | |
51ea9c94 | 1535 | |
1536 | Check_Applicable_Policy (Aspect); | |
1537 | ||
1538 | if Is_Disabled (Aspect) then | |
1539 | goto Continue; | |
1540 | end if; | |
1541 | ||
c0793fff | 1542 | -- Set the source location of expression, used in the case of |
1543 | -- a failed precondition/postcondition or invariant. Note that | |
1544 | -- the source location of the expression is not usually the best | |
1545 | -- choice here. For example, it gets located on the last AND | |
1546 | -- keyword in a chain of boolean expressiond AND'ed together. | |
1547 | -- It is best to put the message on the first character of the | |
1548 | -- assertion, which is the effect of the First_Node call here. | |
1549 | ||
1550 | if Present (Expr) then | |
1551 | Eloc := Sloc (First_Node (Expr)); | |
1552 | end if; | |
1553 | ||
d7ed83a2 | 1554 | -- Check restriction No_Implementation_Aspect_Specifications |
1555 | ||
c171e1be | 1556 | if Implementation_Defined_Aspect (A_Id) then |
d7ed83a2 | 1557 | Check_Restriction |
1558 | (No_Implementation_Aspect_Specifications, Aspect); | |
1559 | end if; | |
1560 | ||
1561 | -- Check restriction No_Specification_Of_Aspect | |
1562 | ||
1563 | Check_Restriction_No_Specification_Of_Aspect (Aspect); | |
1564 | ||
f67ed4f5 | 1565 | -- Mark aspect analyzed (actual analysis is delayed till later) |
d7ed83a2 | 1566 | |
fb7f2fc4 | 1567 | Set_Analyzed (Aspect); |
d74fc39a | 1568 | Set_Entity (Aspect, E); |
1569 | Ent := New_Occurrence_Of (E, Sloc (Id)); | |
1570 | ||
1e3c4ae6 | 1571 | -- Check for duplicate aspect. Note that the Comes_From_Source |
1572 | -- test allows duplicate Pre/Post's that we generate internally | |
1573 | -- to escape being flagged here. | |
ae888dbd | 1574 | |
6c545057 | 1575 | if No_Duplicates_Allowed (A_Id) then |
1576 | Anod := First (L); | |
1577 | while Anod /= Aspect loop | |
c171e1be | 1578 | if Comes_From_Source (Aspect) |
1579 | and then Same_Aspect (A_Id, Get_Aspect_Id (Anod)) | |
6c545057 | 1580 | then |
1581 | Error_Msg_Name_1 := Nam; | |
1582 | Error_Msg_Sloc := Sloc (Anod); | |
39e1f22f | 1583 | |
6c545057 | 1584 | -- Case of same aspect specified twice |
39e1f22f | 1585 | |
6c545057 | 1586 | if Class_Present (Anod) = Class_Present (Aspect) then |
1587 | if not Class_Present (Anod) then | |
1588 | Error_Msg_NE | |
1589 | ("aspect% for & previously given#", | |
1590 | Id, E); | |
1591 | else | |
1592 | Error_Msg_NE | |
1593 | ("aspect `%''Class` for & previously given#", | |
1594 | Id, E); | |
1595 | end if; | |
39e1f22f | 1596 | end if; |
6c545057 | 1597 | end if; |
ae888dbd | 1598 | |
6c545057 | 1599 | Next (Anod); |
1600 | end loop; | |
1601 | end if; | |
ae888dbd | 1602 | |
4db325e6 | 1603 | -- Check some general restrictions on language defined aspects |
1604 | ||
c171e1be | 1605 | if not Implementation_Defined_Aspect (A_Id) then |
4db325e6 | 1606 | Error_Msg_Name_1 := Nam; |
1607 | ||
1608 | -- Not allowed for renaming declarations | |
1609 | ||
1610 | if Nkind (N) in N_Renaming_Declaration then | |
1611 | Error_Msg_N | |
1612 | ("aspect % not allowed for renaming declaration", | |
1613 | Aspect); | |
1614 | end if; | |
1615 | ||
1616 | -- Not allowed for formal type declarations | |
1617 | ||
1618 | if Nkind (N) = N_Formal_Type_Declaration then | |
1619 | Error_Msg_N | |
1620 | ("aspect % not allowed for formal type declaration", | |
1621 | Aspect); | |
1622 | end if; | |
1623 | end if; | |
1624 | ||
7d20685d | 1625 | -- Copy expression for later processing by the procedures |
1626 | -- Check_Aspect_At_[Freeze_Point | End_Of_Declarations] | |
1627 | ||
1628 | Set_Entity (Id, New_Copy_Tree (Expr)); | |
1629 | ||
37c6e44c | 1630 | -- Set Delay_Required as appropriate to aspect |
1631 | ||
1632 | case Aspect_Delay (A_Id) is | |
1633 | when Always_Delay => | |
1634 | Delay_Required := True; | |
1635 | ||
1636 | when Never_Delay => | |
1637 | Delay_Required := False; | |
1638 | ||
1639 | when Rep_Aspect => | |
1640 | ||
1641 | -- If expression has the form of an integer literal, then | |
1642 | -- do not delay, since we know the value cannot change. | |
1643 | -- This optimization catches most rep clause cases. | |
1644 | ||
e43fc5c5 | 1645 | -- For Boolean aspects, don't delay if no expression |
1646 | ||
1647 | if A_Id in Boolean_Aspects and then No (Expr) then | |
1648 | Delay_Required := False; | |
1649 | ||
1650 | -- For non-Boolean aspects, don't delay if integer literal | |
1651 | ||
1652 | elsif A_Id not in Boolean_Aspects | |
1653 | and then Present (Expr) | |
1654 | and then Nkind (Expr) = N_Integer_Literal | |
1655 | then | |
1656 | Delay_Required := False; | |
1657 | ||
1658 | -- All other cases are delayed | |
1659 | ||
1660 | else | |
1661 | Delay_Required := True; | |
1662 | Set_Has_Delayed_Rep_Aspects (E); | |
1663 | end if; | |
37c6e44c | 1664 | end case; |
1665 | ||
ae888dbd | 1666 | -- Processing based on specific aspect |
1667 | ||
d74fc39a | 1668 | case A_Id is |
aa2f48d2 | 1669 | when Aspect_Unimplemented => |
1670 | null; -- ??? temp for now | |
ae888dbd | 1671 | |
1672 | -- No_Aspect should be impossible | |
1673 | ||
1674 | when No_Aspect => | |
1675 | raise Program_Error; | |
1676 | ||
89f1e35c | 1677 | -- Case 1: Aspects corresponding to attribute definition |
1678 | -- clauses. | |
ae888dbd | 1679 | |
b7b74740 | 1680 | when Aspect_Address | |
1681 | Aspect_Alignment | | |
1682 | Aspect_Bit_Order | | |
1683 | Aspect_Component_Size | | |
89f1e35c | 1684 | Aspect_Constant_Indexing | |
89f1e35c | 1685 | Aspect_Default_Iterator | |
1686 | Aspect_Dispatching_Domain | | |
b7b74740 | 1687 | Aspect_External_Tag | |
1688 | Aspect_Input | | |
b3f8228a | 1689 | Aspect_Iterable | |
89f1e35c | 1690 | Aspect_Iterator_Element | |
b7b74740 | 1691 | Aspect_Machine_Radix | |
1692 | Aspect_Object_Size | | |
1693 | Aspect_Output | | |
1694 | Aspect_Read | | |
1695 | Aspect_Scalar_Storage_Order | | |
1696 | Aspect_Size | | |
1697 | Aspect_Small | | |
1698 | Aspect_Simple_Storage_Pool | | |
1699 | Aspect_Storage_Pool | | |
b7b74740 | 1700 | Aspect_Stream_Size | |
1701 | Aspect_Value_Size | | |
89f1e35c | 1702 | Aspect_Variable_Indexing | |
b7b74740 | 1703 | Aspect_Write => |
d74fc39a | 1704 | |
89f1e35c | 1705 | -- Indexing aspects apply only to tagged type |
1706 | ||
1707 | if (A_Id = Aspect_Constant_Indexing | |
37c6e44c | 1708 | or else |
1709 | A_Id = Aspect_Variable_Indexing) | |
89f1e35c | 1710 | and then not (Is_Type (E) |
1711 | and then Is_Tagged_Type (E)) | |
1712 | then | |
05987af3 | 1713 | Error_Msg_N |
1714 | ("indexing aspect can only apply to a tagged type", | |
3f4c9ffc | 1715 | Aspect); |
89f1e35c | 1716 | goto Continue; |
1717 | end if; | |
1718 | ||
39616053 | 1719 | -- For the case of aspect Address, we don't consider that we |
588e7f97 | 1720 | -- know the entity is never set in the source, since it is |
1721 | -- is likely aliasing is occurring. | |
1722 | ||
1723 | -- Note: one might think that the analysis of the resulting | |
1724 | -- attribute definition clause would take care of that, but | |
1725 | -- that's not the case since it won't be from source. | |
1726 | ||
1727 | if A_Id = Aspect_Address then | |
1728 | Set_Never_Set_In_Source (E, False); | |
1729 | end if; | |
1730 | ||
5ac76cee | 1731 | -- Correctness of the profile of a stream operation is |
1732 | -- verified at the freeze point, but we must detect the | |
1733 | -- illegal specification of this aspect for a subtype now, | |
1734 | -- to prevent malformed rep_item chains. | |
1735 | ||
fbf4d6ef | 1736 | if A_Id = Aspect_Input or else |
1737 | A_Id = Aspect_Output or else | |
1738 | A_Id = Aspect_Read or else | |
1739 | A_Id = Aspect_Write | |
5ac76cee | 1740 | then |
fbf4d6ef | 1741 | if not Is_First_Subtype (E) then |
1742 | Error_Msg_N | |
1743 | ("local name must be a first subtype", Aspect); | |
1744 | goto Continue; | |
1745 | ||
1746 | -- If stream aspect applies to the class-wide type, | |
1747 | -- the generated attribute definition applies to the | |
1748 | -- class-wide type as well. | |
1749 | ||
1750 | elsif Class_Present (Aspect) then | |
1751 | Ent := | |
1752 | Make_Attribute_Reference (Loc, | |
1753 | Prefix => Ent, | |
1754 | Attribute_Name => Name_Class); | |
1755 | end if; | |
5ac76cee | 1756 | end if; |
1757 | ||
d74fc39a | 1758 | -- Construct the attribute definition clause |
1759 | ||
1760 | Aitem := | |
94153a42 | 1761 | Make_Attribute_Definition_Clause (Loc, |
d74fc39a | 1762 | Name => Ent, |
ae888dbd | 1763 | Chars => Chars (Id), |
1764 | Expression => Relocate_Node (Expr)); | |
1765 | ||
af9a0cc3 | 1766 | -- If the address is specified, then we treat the entity as |
41f06abf | 1767 | -- referenced, to avoid spurious warnings. This is analogous |
1768 | -- to what is done with an attribute definition clause, but | |
1769 | -- here we don't want to generate a reference because this | |
1770 | -- is the point of definition of the entity. | |
1771 | ||
1772 | if A_Id = Aspect_Address then | |
1773 | Set_Referenced (E); | |
1774 | end if; | |
1775 | ||
51ea9c94 | 1776 | -- Case 2: Aspects corresponding to pragmas |
d74fc39a | 1777 | |
89f1e35c | 1778 | -- Case 2a: Aspects corresponding to pragmas with two |
1779 | -- arguments, where the first argument is a local name | |
1780 | -- referring to the entity, and the second argument is the | |
1781 | -- aspect definition expression. | |
ae888dbd | 1782 | |
04ae062f | 1783 | -- Linker_Section/Suppress/Unsuppress |
0fd13d32 | 1784 | |
04ae062f | 1785 | when Aspect_Linker_Section | |
1786 | Aspect_Suppress | | |
1787 | Aspect_Unsuppress => | |
ae888dbd | 1788 | |
0fd13d32 | 1789 | Make_Aitem_Pragma |
1790 | (Pragma_Argument_Associations => New_List ( | |
1791 | Make_Pragma_Argument_Association (Loc, | |
1792 | Expression => New_Occurrence_Of (E, Loc)), | |
1793 | Make_Pragma_Argument_Association (Sloc (Expr), | |
1794 | Expression => Relocate_Node (Expr))), | |
1795 | Pragma_Name => Chars (Id)); | |
57cd943b | 1796 | |
0fd13d32 | 1797 | -- Synchronization |
d74fc39a | 1798 | |
0fd13d32 | 1799 | -- Corresponds to pragma Implemented, construct the pragma |
49213728 | 1800 | |
5bbfbad2 | 1801 | when Aspect_Synchronization => |
0fd13d32 | 1802 | Make_Aitem_Pragma |
1803 | (Pragma_Argument_Associations => New_List ( | |
1804 | Make_Pragma_Argument_Association (Loc, | |
1805 | Expression => New_Occurrence_Of (E, Loc)), | |
1806 | Make_Pragma_Argument_Association (Sloc (Expr), | |
1807 | Expression => Relocate_Node (Expr))), | |
1808 | Pragma_Name => Name_Implemented); | |
49213728 | 1809 | |
e2bf777d | 1810 | -- Attach_Handler |
0fd13d32 | 1811 | |
89f1e35c | 1812 | when Aspect_Attach_Handler => |
0fd13d32 | 1813 | Make_Aitem_Pragma |
1814 | (Pragma_Argument_Associations => New_List ( | |
1815 | Make_Pragma_Argument_Association (Sloc (Ent), | |
1816 | Expression => Ent), | |
1817 | Make_Pragma_Argument_Association (Sloc (Expr), | |
1818 | Expression => Relocate_Node (Expr))), | |
1819 | Pragma_Name => Name_Attach_Handler); | |
1820 | ||
f67ed4f5 | 1821 | -- We need to insert this pragma into the tree to get proper |
1822 | -- processing and to look valid from a placement viewpoint. | |
1823 | ||
e2bf777d | 1824 | Insert_Pragma (Aitem); |
f67ed4f5 | 1825 | goto Continue; |
1826 | ||
0fd13d32 | 1827 | -- Dynamic_Predicate, Predicate, Static_Predicate |
89f1e35c | 1828 | |
1829 | when Aspect_Dynamic_Predicate | | |
1830 | Aspect_Predicate | | |
1831 | Aspect_Static_Predicate => | |
1832 | ||
a47ce82d | 1833 | -- These aspects apply only to subtypes |
1834 | ||
1835 | if not Is_Type (E) then | |
1836 | Error_Msg_N | |
1837 | ("predicate can only be specified for a subtype", | |
1838 | Aspect); | |
1839 | goto Continue; | |
7c0c95b8 | 1840 | |
1841 | elsif Is_Incomplete_Type (E) then | |
1842 | Error_Msg_N | |
1843 | ("predicate cannot apply to incomplete view", Aspect); | |
1844 | goto Continue; | |
a47ce82d | 1845 | end if; |
1846 | ||
89f1e35c | 1847 | -- Construct the pragma (always a pragma Predicate, with |
51ea9c94 | 1848 | -- flags recording whether it is static/dynamic). We also |
1849 | -- set flags recording this in the type itself. | |
89f1e35c | 1850 | |
0fd13d32 | 1851 | Make_Aitem_Pragma |
1852 | (Pragma_Argument_Associations => New_List ( | |
1853 | Make_Pragma_Argument_Association (Sloc (Ent), | |
1854 | Expression => Ent), | |
1855 | Make_Pragma_Argument_Association (Sloc (Expr), | |
1856 | Expression => Relocate_Node (Expr))), | |
1857 | Pragma_Name => Name_Predicate); | |
89f1e35c | 1858 | |
51ea9c94 | 1859 | -- Mark type has predicates, and remember what kind of |
1860 | -- aspect lead to this predicate (we need this to access | |
1861 | -- the right set of check policies later on). | |
1862 | ||
1863 | Set_Has_Predicates (E); | |
1864 | ||
1865 | if A_Id = Aspect_Dynamic_Predicate then | |
1866 | Set_Has_Dynamic_Predicate_Aspect (E); | |
1867 | elsif A_Id = Aspect_Static_Predicate then | |
1868 | Set_Has_Static_Predicate_Aspect (E); | |
1869 | end if; | |
1870 | ||
89f1e35c | 1871 | -- If the type is private, indicate that its completion |
6653b695 | 1872 | -- has a freeze node, because that is the one that will |
1873 | -- be visible at freeze time. | |
89f1e35c | 1874 | |
0fd13d32 | 1875 | if Is_Private_Type (E) and then Present (Full_View (E)) then |
89f1e35c | 1876 | Set_Has_Predicates (Full_View (E)); |
51ea9c94 | 1877 | |
1878 | if A_Id = Aspect_Dynamic_Predicate then | |
1879 | Set_Has_Dynamic_Predicate_Aspect (Full_View (E)); | |
1880 | elsif A_Id = Aspect_Static_Predicate then | |
1881 | Set_Has_Static_Predicate_Aspect (Full_View (E)); | |
1882 | end if; | |
1883 | ||
89f1e35c | 1884 | Set_Has_Delayed_Aspects (Full_View (E)); |
1885 | Ensure_Freeze_Node (Full_View (E)); | |
1886 | end if; | |
1887 | ||
1888 | -- Case 2b: Aspects corresponding to pragmas with two | |
1889 | -- arguments, where the second argument is a local name | |
1890 | -- referring to the entity, and the first argument is the | |
1891 | -- aspect definition expression. | |
ae888dbd | 1892 | |
0fd13d32 | 1893 | -- Convention |
1894 | ||
a5a64273 | 1895 | when Aspect_Convention => |
1896 | ||
1897 | -- The aspect may be part of the specification of an import | |
1898 | -- or export pragma. Scan the aspect list to gather the | |
1899 | -- other components, if any. The name of the generated | |
1900 | -- pragma is one of Convention/Import/Export. | |
1901 | ||
1902 | declare | |
97bf66e6 | 1903 | Args : constant List_Id := New_List ( |
1904 | Make_Pragma_Argument_Association (Sloc (Expr), | |
1905 | Expression => Relocate_Node (Expr)), | |
1906 | Make_Pragma_Argument_Association (Sloc (Ent), | |
1907 | Expression => Ent)); | |
1908 | ||
1909 | Imp_Exp_Seen : Boolean := False; | |
1910 | -- Flag set when aspect Import or Export has been seen | |
1911 | ||
1912 | Imp_Seen : Boolean := False; | |
1913 | -- Flag set when aspect Import has been seen | |
1914 | ||
1915 | Asp : Node_Id; | |
1916 | Asp_Nam : Name_Id; | |
1917 | Extern_Arg : Node_Id; | |
1918 | Link_Arg : Node_Id; | |
1919 | Prag_Nam : Name_Id; | |
a5a64273 | 1920 | |
1921 | begin | |
97bf66e6 | 1922 | Extern_Arg := Empty; |
1923 | Link_Arg := Empty; | |
1924 | Prag_Nam := Chars (Id); | |
1925 | ||
1926 | Asp := First (L); | |
1927 | while Present (Asp) loop | |
1928 | Asp_Nam := Chars (Identifier (Asp)); | |
1929 | ||
1930 | -- Aspects Import and Export take precedence over | |
1931 | -- aspect Convention. As a result the generated pragma | |
1932 | -- must carry the proper interfacing aspect's name. | |
1933 | ||
1934 | if Nam_In (Asp_Nam, Name_Import, Name_Export) then | |
1935 | if Imp_Exp_Seen then | |
1936 | Error_Msg_N ("conflicting", Asp); | |
a5a64273 | 1937 | else |
97bf66e6 | 1938 | Imp_Exp_Seen := True; |
1939 | ||
1940 | if Asp_Nam = Name_Import then | |
1941 | Imp_Seen := True; | |
1942 | end if; | |
a5a64273 | 1943 | end if; |
1944 | ||
97bf66e6 | 1945 | Prag_Nam := Asp_Nam; |
a5a64273 | 1946 | |
97bf66e6 | 1947 | -- Aspect External_Name adds an extra argument to the |
1948 | -- generated pragma. | |
1949 | ||
1950 | elsif Asp_Nam = Name_External_Name then | |
1951 | Extern_Arg := | |
4bba0a8d | 1952 | Make_Pragma_Argument_Association (Loc, |
97bf66e6 | 1953 | Chars => Asp_Nam, |
1954 | Expression => Relocate_Node (Expression (Asp))); | |
1955 | ||
1956 | -- Aspect Link_Name adds an extra argument to the | |
1957 | -- generated pragma. | |
a5a64273 | 1958 | |
97bf66e6 | 1959 | elsif Asp_Nam = Name_Link_Name then |
1960 | Link_Arg := | |
4bba0a8d | 1961 | Make_Pragma_Argument_Association (Loc, |
97bf66e6 | 1962 | Chars => Asp_Nam, |
1963 | Expression => Relocate_Node (Expression (Asp))); | |
a5a64273 | 1964 | end if; |
1965 | ||
97bf66e6 | 1966 | Next (Asp); |
a5a64273 | 1967 | end loop; |
1968 | ||
97bf66e6 | 1969 | -- Assemble the full argument list |
b9e61b2a | 1970 | |
97bf66e6 | 1971 | if Present (Extern_Arg) then |
1972 | Append_To (Args, Extern_Arg); | |
a5a64273 | 1973 | end if; |
1974 | ||
8a1e3cde | 1975 | if Present (Link_Arg) then |
1976 | Append_To (Args, Link_Arg); | |
1977 | end if; | |
1978 | ||
0fd13d32 | 1979 | Make_Aitem_Pragma |
97bf66e6 | 1980 | (Pragma_Argument_Associations => Args, |
1981 | Pragma_Name => Prag_Nam); | |
1982 | ||
1983 | -- Store the generated pragma Import in the related | |
1984 | -- subprogram. | |
1985 | ||
1986 | if Imp_Seen and then Is_Subprogram (E) then | |
1987 | Set_Import_Pragma (E, Aitem); | |
1988 | end if; | |
a5a64273 | 1989 | end; |
e1cedbae | 1990 | |
0fd13d32 | 1991 | -- CPU, Interrupt_Priority, Priority |
1992 | ||
d6814978 | 1993 | -- These three aspects can be specified for a subprogram spec |
1994 | -- or body, in which case we analyze the expression and export | |
1995 | -- the value of the aspect. | |
1996 | ||
1997 | -- Previously, we generated an equivalent pragma for bodies | |
1998 | -- (note that the specs cannot contain these pragmas). The | |
1999 | -- pragma was inserted ahead of local declarations, rather than | |
2000 | -- after the body. This leads to a certain duplication between | |
2001 | -- the processing performed for the aspect and the pragma, but | |
2002 | -- given the straightforward handling required it is simpler | |
2003 | -- to duplicate than to translate the aspect in the spec into | |
2004 | -- a pragma in the declarative part of the body. | |
3a72f9c3 | 2005 | |
2006 | when Aspect_CPU | | |
2007 | Aspect_Interrupt_Priority | | |
2008 | Aspect_Priority => | |
51ea9c94 | 2009 | |
d6814978 | 2010 | if Nkind_In (N, N_Subprogram_Body, |
2011 | N_Subprogram_Declaration) | |
2012 | then | |
2013 | -- Analyze the aspect expression | |
2014 | ||
2015 | Analyze_And_Resolve (Expr, Standard_Integer); | |
2016 | ||
2017 | -- Interrupt_Priority aspect not allowed for main | |
2018 | -- subprograms. ARM D.1 does not forbid this explicitly, | |
2019 | -- but ARM J.15.11 (6/3) does not permit pragma | |
2020 | -- Interrupt_Priority for subprograms. | |
2021 | ||
2022 | if A_Id = Aspect_Interrupt_Priority then | |
2023 | Error_Msg_N | |
2024 | ("Interrupt_Priority aspect cannot apply to " | |
2025 | & "subprogram", Expr); | |
2026 | ||
2027 | -- The expression must be static | |
2028 | ||
cda40848 | 2029 | elsif not Is_OK_Static_Expression (Expr) then |
d6814978 | 2030 | Flag_Non_Static_Expr |
2031 | ("aspect requires static expression!", Expr); | |
2032 | ||
24d7b9d6 | 2033 | -- Check whether this is the main subprogram. Issue a |
2034 | -- warning only if it is obviously not a main program | |
2035 | -- (when it has parameters or when the subprogram is | |
2036 | -- within a package). | |
2037 | ||
2038 | elsif Present (Parameter_Specifications | |
2039 | (Specification (N))) | |
2040 | or else not Is_Compilation_Unit (Defining_Entity (N)) | |
d6814978 | 2041 | then |
2042 | -- See ARM D.1 (14/3) and D.16 (12/3) | |
2043 | ||
2044 | Error_Msg_N | |
2045 | ("aspect applied to subprogram other than the " | |
2046 | & "main subprogram has no effect??", Expr); | |
2047 | ||
2048 | -- Otherwise check in range and export the value | |
2049 | ||
2050 | -- For the CPU aspect | |
2051 | ||
2052 | elsif A_Id = Aspect_CPU then | |
2053 | if Is_In_Range (Expr, RTE (RE_CPU_Range)) then | |
2054 | ||
2055 | -- Value is correct so we export the value to make | |
2056 | -- it available at execution time. | |
2057 | ||
2058 | Set_Main_CPU | |
2059 | (Main_Unit, UI_To_Int (Expr_Value (Expr))); | |
2060 | ||
2061 | else | |
2062 | Error_Msg_N | |
2063 | ("main subprogram CPU is out of range", Expr); | |
2064 | end if; | |
2065 | ||
2066 | -- For the Priority aspect | |
2067 | ||
2068 | elsif A_Id = Aspect_Priority then | |
2069 | if Is_In_Range (Expr, RTE (RE_Priority)) then | |
2070 | ||
2071 | -- Value is correct so we export the value to make | |
2072 | -- it available at execution time. | |
2073 | ||
2074 | Set_Main_Priority | |
2075 | (Main_Unit, UI_To_Int (Expr_Value (Expr))); | |
2076 | ||
32572384 | 2077 | -- Ignore pragma if Relaxed_RM_Semantics to support |
2078 | -- other targets/non GNAT compilers. | |
2079 | ||
2080 | elsif not Relaxed_RM_Semantics then | |
d6814978 | 2081 | Error_Msg_N |
2082 | ("main subprogram priority is out of range", | |
2083 | Expr); | |
2084 | end if; | |
2085 | end if; | |
2086 | ||
2087 | -- Load an arbitrary entity from System.Tasking.Stages | |
2088 | -- or System.Tasking.Restricted.Stages (depending on | |
2089 | -- the supported profile) to make sure that one of these | |
2090 | -- packages is implicitly with'ed, since we need to have | |
2091 | -- the tasking run time active for the pragma Priority to | |
a0c3eeb9 | 2092 | -- have any effect. Previously we with'ed the package |
d6814978 | 2093 | -- System.Tasking, but this package does not trigger the |
2094 | -- required initialization of the run-time library. | |
2095 | ||
2096 | declare | |
2097 | Discard : Entity_Id; | |
d6814978 | 2098 | begin |
2099 | if Restricted_Profile then | |
2100 | Discard := RTE (RE_Activate_Restricted_Tasks); | |
2101 | else | |
2102 | Discard := RTE (RE_Activate_Tasks); | |
2103 | end if; | |
2104 | end; | |
2105 | ||
2106 | -- Handling for these Aspects in subprograms is complete | |
2107 | ||
2108 | goto Continue; | |
2109 | ||
2110 | -- For tasks | |
0fd13d32 | 2111 | |
3a72f9c3 | 2112 | else |
d6814978 | 2113 | -- Pass the aspect as an attribute |
2114 | ||
3a72f9c3 | 2115 | Aitem := |
2116 | Make_Attribute_Definition_Clause (Loc, | |
2117 | Name => Ent, | |
2118 | Chars => Chars (Id), | |
2119 | Expression => Relocate_Node (Expr)); | |
2120 | end if; | |
2121 | ||
0fd13d32 | 2122 | -- Warnings |
2123 | ||
ae888dbd | 2124 | when Aspect_Warnings => |
0fd13d32 | 2125 | Make_Aitem_Pragma |
2126 | (Pragma_Argument_Associations => New_List ( | |
2127 | Make_Pragma_Argument_Association (Sloc (Expr), | |
2128 | Expression => Relocate_Node (Expr)), | |
2129 | Make_Pragma_Argument_Association (Loc, | |
2130 | Expression => New_Occurrence_Of (E, Loc))), | |
2131 | Pragma_Name => Chars (Id)); | |
ae888dbd | 2132 | |
89f1e35c | 2133 | -- Case 2c: Aspects corresponding to pragmas with three |
2134 | -- arguments. | |
d64221a7 | 2135 | |
89f1e35c | 2136 | -- Invariant aspects have a first argument that references the |
2137 | -- entity, a second argument that is the expression and a third | |
2138 | -- argument that is an appropriate message. | |
d64221a7 | 2139 | |
0fd13d32 | 2140 | -- Invariant, Type_Invariant |
2141 | ||
89f1e35c | 2142 | when Aspect_Invariant | |
2143 | Aspect_Type_Invariant => | |
d64221a7 | 2144 | |
89f1e35c | 2145 | -- Analysis of the pragma will verify placement legality: |
2146 | -- an invariant must apply to a private type, or appear in | |
2147 | -- the private part of a spec and apply to a completion. | |
d64221a7 | 2148 | |
0fd13d32 | 2149 | Make_Aitem_Pragma |
2150 | (Pragma_Argument_Associations => New_List ( | |
2151 | Make_Pragma_Argument_Association (Sloc (Ent), | |
2152 | Expression => Ent), | |
2153 | Make_Pragma_Argument_Association (Sloc (Expr), | |
2154 | Expression => Relocate_Node (Expr))), | |
2155 | Pragma_Name => Name_Invariant); | |
89f1e35c | 2156 | |
2157 | -- Add message unless exception messages are suppressed | |
2158 | ||
2159 | if not Opt.Exception_Locations_Suppressed then | |
2160 | Append_To (Pragma_Argument_Associations (Aitem), | |
2161 | Make_Pragma_Argument_Association (Eloc, | |
2162 | Chars => Name_Message, | |
2163 | Expression => | |
2164 | Make_String_Literal (Eloc, | |
2165 | Strval => "failed invariant from " | |
2166 | & Build_Location_String (Eloc)))); | |
d64221a7 | 2167 | end if; |
2168 | ||
89f1e35c | 2169 | -- For Invariant case, insert immediately after the entity |
2170 | -- declaration. We do not have to worry about delay issues | |
2171 | -- since the pragma processing takes care of this. | |
2172 | ||
89f1e35c | 2173 | Delay_Required := False; |
d64221a7 | 2174 | |
47a46747 | 2175 | -- Case 2d : Aspects that correspond to a pragma with one |
2176 | -- argument. | |
2177 | ||
0fd13d32 | 2178 | -- Abstract_State |
115f7b08 | 2179 | |
d4e369ad | 2180 | -- Aspect Abstract_State introduces implicit declarations for |
2181 | -- all state abstraction entities it defines. To emulate this | |
2182 | -- behavior, insert the pragma at the beginning of the visible | |
2183 | -- declarations of the related package so that it is analyzed | |
2184 | -- immediately. | |
2185 | ||
9129c28f | 2186 | when Aspect_Abstract_State => Abstract_State : declare |
eb4f7efa | 2187 | Context : Node_Id := N; |
630b6d55 | 2188 | Decl : Node_Id; |
eb4f7efa | 2189 | Decls : List_Id; |
9129c28f | 2190 | |
2191 | begin | |
eb4f7efa | 2192 | -- When aspect Abstract_State appears on a generic package, |
2193 | -- it is propageted to the package instance. The context in | |
2194 | -- this case is the instance spec. | |
2195 | ||
2196 | if Nkind (Context) = N_Package_Instantiation then | |
2197 | Context := Instance_Spec (Context); | |
2198 | end if; | |
2199 | ||
2200 | if Nkind_In (Context, N_Generic_Package_Declaration, | |
2201 | N_Package_Declaration) | |
9129c28f | 2202 | then |
9129c28f | 2203 | Make_Aitem_Pragma |
2204 | (Pragma_Argument_Associations => New_List ( | |
2205 | Make_Pragma_Argument_Association (Loc, | |
2206 | Expression => Relocate_Node (Expr))), | |
2207 | Pragma_Name => Name_Abstract_State); | |
e2bf777d | 2208 | Decorate (Aspect, Aitem); |
9129c28f | 2209 | |
630b6d55 | 2210 | Decls := Visible_Declarations (Specification (Context)); |
2211 | ||
2212 | -- In general pragma Abstract_State must be at the top | |
2213 | -- of the existing visible declarations to emulate its | |
2214 | -- source counterpart. The only exception to this is a | |
2215 | -- generic instance in which case the pragma must be | |
2216 | -- inserted after the association renamings. | |
2217 | ||
2218 | if Present (Decls) then | |
50e44732 | 2219 | Decl := First (Decls); |
630b6d55 | 2220 | |
2221 | -- The visible declarations of a generic instance have | |
2222 | -- the following structure: | |
2223 | ||
2224 | -- <renamings of generic formals> | |
2225 | -- <renamings of internally-generated spec and body> | |
2226 | -- <first source declaration> | |
2227 | ||
2228 | -- The pragma must be inserted before the first source | |
50e44732 | 2229 | -- declaration, skip the instance "header". |
630b6d55 | 2230 | |
2231 | if Is_Generic_Instance (Defining_Entity (Context)) then | |
630b6d55 | 2232 | while Present (Decl) |
2233 | and then not Comes_From_Source (Decl) | |
2234 | loop | |
2235 | Decl := Next (Decl); | |
2236 | end loop; | |
50e44732 | 2237 | end if; |
630b6d55 | 2238 | |
3dbe7a69 | 2239 | -- When aspects Abstract_State, Ghost, |
2240 | -- Initial_Condition and Initializes are out of order, | |
2241 | -- ensure that pragma SPARK_Mode is always at the top | |
2242 | -- of the declarations to properly enabled/suppress | |
2243 | -- errors. | |
630b6d55 | 2244 | |
50e44732 | 2245 | Insert_After_SPARK_Mode |
2246 | (Prag => Aitem, | |
2247 | Ins_Nod => Decl, | |
2248 | Decls => Decls); | |
630b6d55 | 2249 | |
2250 | -- Otherwise the pragma forms a new declarative list | |
2251 | ||
2252 | else | |
2253 | Set_Visible_Declarations | |
2254 | (Specification (Context), New_List (Aitem)); | |
2255 | end if; | |
9129c28f | 2256 | |
2257 | else | |
2258 | Error_Msg_NE | |
2259 | ("aspect & must apply to a package declaration", | |
2260 | Aspect, Id); | |
2261 | end if; | |
2262 | ||
2263 | goto Continue; | |
2264 | end Abstract_State; | |
115f7b08 | 2265 | |
ec6f6da5 | 2266 | -- Aspect Default_Internal_Condition is never delayed because |
2267 | -- it is equivalent to a source pragma which appears after the | |
2268 | -- related private type. To deal with forward references, the | |
2269 | -- generated pragma is stored in the rep chain of the related | |
2270 | -- private type as types do not carry contracts. The pragma is | |
2271 | -- wrapped inside of a procedure at the freeze point of the | |
2272 | -- private type's full view. | |
2273 | ||
2274 | when Aspect_Default_Initial_Condition => | |
2275 | Make_Aitem_Pragma | |
2276 | (Pragma_Argument_Associations => New_List ( | |
2277 | Make_Pragma_Argument_Association (Loc, | |
2278 | Expression => Relocate_Node (Expr))), | |
2279 | Pragma_Name => | |
2280 | Name_Default_Initial_Condition); | |
2281 | ||
2282 | Decorate (Aspect, Aitem); | |
2283 | Insert_Pragma (Aitem); | |
2284 | goto Continue; | |
2285 | ||
647fab54 | 2286 | -- Default_Storage_Pool |
2287 | ||
2288 | when Aspect_Default_Storage_Pool => | |
2289 | Make_Aitem_Pragma | |
2290 | (Pragma_Argument_Associations => New_List ( | |
2291 | Make_Pragma_Argument_Association (Loc, | |
2292 | Expression => Relocate_Node (Expr))), | |
2293 | Pragma_Name => | |
2294 | Name_Default_Storage_Pool); | |
2295 | ||
2296 | Decorate (Aspect, Aitem); | |
2297 | Insert_Pragma (Aitem); | |
2298 | goto Continue; | |
2299 | ||
0fd13d32 | 2300 | -- Depends |
2301 | ||
e2bf777d | 2302 | -- Aspect Depends is never delayed because it is equivalent to |
2303 | -- a source pragma which appears after the related subprogram. | |
2304 | -- To deal with forward references, the generated pragma is | |
2305 | -- stored in the contract of the related subprogram and later | |
2306 | -- analyzed at the end of the declarative region. See routine | |
2307 | -- Analyze_Depends_In_Decl_Part for details. | |
6144c105 | 2308 | |
12334c57 | 2309 | when Aspect_Depends => |
0fd13d32 | 2310 | Make_Aitem_Pragma |
2311 | (Pragma_Argument_Associations => New_List ( | |
2312 | Make_Pragma_Argument_Association (Loc, | |
2313 | Expression => Relocate_Node (Expr))), | |
2314 | Pragma_Name => Name_Depends); | |
2315 | ||
e2bf777d | 2316 | Decorate (Aspect, Aitem); |
2317 | Insert_Pragma (Aitem); | |
c1006d6d | 2318 | goto Continue; |
2319 | ||
cab27d2a | 2320 | -- Aspect Extensions_Visible is never delayed because it is |
2321 | -- equivalent to a source pragma which appears after the | |
2322 | -- related subprogram. | |
2323 | ||
2324 | when Aspect_Extensions_Visible => | |
2325 | Make_Aitem_Pragma | |
2326 | (Pragma_Argument_Associations => New_List ( | |
2327 | Make_Pragma_Argument_Association (Loc, | |
2328 | Expression => Relocate_Node (Expr))), | |
2329 | Pragma_Name => Name_Extensions_Visible); | |
2330 | ||
2331 | Decorate (Aspect, Aitem); | |
2332 | Insert_Pragma (Aitem); | |
2333 | goto Continue; | |
2334 | ||
3dbe7a69 | 2335 | -- Aspect Ghost is never delayed because it is equivalent to a |
2336 | -- source pragma which appears at the top of [generic] package | |
2337 | -- declarations or after an object, a [generic] subprogram, or | |
2338 | -- a type declaration. | |
2339 | ||
2340 | when Aspect_Ghost => Ghost : declare | |
2341 | Decls : List_Id; | |
2342 | ||
2343 | begin | |
2344 | Make_Aitem_Pragma | |
2345 | (Pragma_Argument_Associations => New_List ( | |
2346 | Make_Pragma_Argument_Association (Loc, | |
2347 | Expression => Relocate_Node (Expr))), | |
2348 | Pragma_Name => Name_Ghost); | |
2349 | ||
2350 | Decorate (Aspect, Aitem); | |
2351 | ||
2352 | -- When the aspect applies to a [generic] package, insert | |
2353 | -- the pragma at the top of the visible declarations. This | |
2354 | -- emulates the placement of a source pragma. | |
2355 | ||
2356 | if Nkind_In (N, N_Generic_Package_Declaration, | |
2357 | N_Package_Declaration) | |
2358 | then | |
2359 | Decls := Visible_Declarations (Specification (N)); | |
2360 | ||
2361 | if No (Decls) then | |
2362 | Decls := New_List; | |
2363 | Set_Visible_Declarations (N, Decls); | |
2364 | end if; | |
2365 | ||
2366 | -- When aspects Abstract_State, Ghost, Initial_Condition | |
2367 | -- and Initializes are out of order, ensure that pragma | |
2368 | -- SPARK_Mode is always at the top of the declarations to | |
2369 | -- properly enabled/suppress errors. | |
2370 | ||
2371 | Insert_After_SPARK_Mode | |
2372 | (Prag => Aitem, | |
2373 | Ins_Nod => First (Decls), | |
2374 | Decls => Decls); | |
2375 | ||
2376 | -- Otherwise the context is an object, [generic] subprogram | |
2377 | -- or type declaration. | |
2378 | ||
2379 | else | |
2380 | Insert_Pragma (Aitem); | |
2381 | end if; | |
2382 | ||
2383 | goto Continue; | |
2384 | end Ghost; | |
2385 | ||
0fd13d32 | 2386 | -- Global |
12334c57 | 2387 | |
e2bf777d | 2388 | -- Aspect Global is never delayed because it is equivalent to |
2389 | -- a source pragma which appears after the related subprogram. | |
2390 | -- To deal with forward references, the generated pragma is | |
2391 | -- stored in the contract of the related subprogram and later | |
2392 | -- analyzed at the end of the declarative region. See routine | |
2393 | -- Analyze_Global_In_Decl_Part for details. | |
3cdbaa5a | 2394 | |
2395 | when Aspect_Global => | |
0fd13d32 | 2396 | Make_Aitem_Pragma |
2397 | (Pragma_Argument_Associations => New_List ( | |
2398 | Make_Pragma_Argument_Association (Loc, | |
2399 | Expression => Relocate_Node (Expr))), | |
2400 | Pragma_Name => Name_Global); | |
2401 | ||
e2bf777d | 2402 | Decorate (Aspect, Aitem); |
2403 | Insert_Pragma (Aitem); | |
c1006d6d | 2404 | goto Continue; |
2405 | ||
9c138530 | 2406 | -- Initial_Condition |
2407 | ||
e2bf777d | 2408 | -- Aspect Initial_Condition is never delayed because it is |
2409 | -- equivalent to a source pragma which appears after the | |
2410 | -- related package. To deal with forward references, the | |
2411 | -- generated pragma is stored in the contract of the related | |
2412 | -- package and later analyzed at the end of the declarative | |
2413 | -- region. See routine Analyze_Initial_Condition_In_Decl_Part | |
2414 | -- for details. | |
9c138530 | 2415 | |
2416 | when Aspect_Initial_Condition => Initial_Condition : declare | |
eb4f7efa | 2417 | Context : Node_Id := N; |
2418 | Decls : List_Id; | |
9c138530 | 2419 | |
2420 | begin | |
e2bf777d | 2421 | -- When aspect Initial_Condition appears on a generic |
2422 | -- package, it is propageted to the package instance. The | |
2423 | -- context in this case is the instance spec. | |
eb4f7efa | 2424 | |
2425 | if Nkind (Context) = N_Package_Instantiation then | |
2426 | Context := Instance_Spec (Context); | |
2427 | end if; | |
2428 | ||
2429 | if Nkind_In (Context, N_Generic_Package_Declaration, | |
2430 | N_Package_Declaration) | |
9c138530 | 2431 | then |
eb4f7efa | 2432 | Decls := Visible_Declarations (Specification (Context)); |
9c138530 | 2433 | |
2434 | Make_Aitem_Pragma | |
2435 | (Pragma_Argument_Associations => New_List ( | |
2436 | Make_Pragma_Argument_Association (Loc, | |
2437 | Expression => Relocate_Node (Expr))), | |
2438 | Pragma_Name => | |
2439 | Name_Initial_Condition); | |
e2bf777d | 2440 | Decorate (Aspect, Aitem); |
9c138530 | 2441 | |
2442 | if No (Decls) then | |
2443 | Decls := New_List; | |
eb4f7efa | 2444 | Set_Visible_Declarations (Context, Decls); |
9c138530 | 2445 | end if; |
2446 | ||
3dbe7a69 | 2447 | -- When aspects Abstract_State, Ghost, Initial_Condition |
2448 | -- and Initializes are out of order, ensure that pragma | |
2449 | -- SPARK_Mode is always at the top of the declarations to | |
2450 | -- properly enabled/suppress errors. | |
50e44732 | 2451 | |
2452 | Insert_After_SPARK_Mode | |
2453 | (Prag => Aitem, | |
2454 | Ins_Nod => First (Decls), | |
2455 | Decls => Decls); | |
9c138530 | 2456 | |
2457 | else | |
2458 | Error_Msg_NE | |
2459 | ("aspect & must apply to a package declaration", | |
2460 | Aspect, Id); | |
2461 | end if; | |
2462 | ||
2463 | goto Continue; | |
2464 | end Initial_Condition; | |
2465 | ||
d4e369ad | 2466 | -- Initializes |
2467 | ||
e2bf777d | 2468 | -- Aspect Initializes is never delayed because it is equivalent |
2469 | -- to a source pragma appearing after the related package. To | |
2470 | -- deal with forward references, the generated pragma is stored | |
2471 | -- in the contract of the related package and later analyzed at | |
2472 | -- the end of the declarative region. For details, see routine | |
2473 | -- Analyze_Initializes_In_Decl_Part. | |
d4e369ad | 2474 | |
2475 | when Aspect_Initializes => Initializes : declare | |
eb4f7efa | 2476 | Context : Node_Id := N; |
2477 | Decls : List_Id; | |
d4e369ad | 2478 | |
2479 | begin | |
50e44732 | 2480 | -- When aspect Initializes appears on a generic package, |
2481 | -- it is propageted to the package instance. The context | |
2482 | -- in this case is the instance spec. | |
eb4f7efa | 2483 | |
2484 | if Nkind (Context) = N_Package_Instantiation then | |
2485 | Context := Instance_Spec (Context); | |
2486 | end if; | |
2487 | ||
2488 | if Nkind_In (Context, N_Generic_Package_Declaration, | |
2489 | N_Package_Declaration) | |
d4e369ad | 2490 | then |
eb4f7efa | 2491 | Decls := Visible_Declarations (Specification (Context)); |
d4e369ad | 2492 | |
2493 | Make_Aitem_Pragma | |
2494 | (Pragma_Argument_Associations => New_List ( | |
2495 | Make_Pragma_Argument_Association (Loc, | |
2496 | Expression => Relocate_Node (Expr))), | |
2497 | Pragma_Name => Name_Initializes); | |
e2bf777d | 2498 | Decorate (Aspect, Aitem); |
d4e369ad | 2499 | |
2500 | if No (Decls) then | |
2501 | Decls := New_List; | |
eb4f7efa | 2502 | Set_Visible_Declarations (Context, Decls); |
d4e369ad | 2503 | end if; |
2504 | ||
3dbe7a69 | 2505 | -- When aspects Abstract_State, Ghost, Initial_Condition |
2506 | -- and Initializes are out of order, ensure that pragma | |
2507 | -- SPARK_Mode is always at the top of the declarations to | |
2508 | -- properly enabled/suppress errors. | |
50e44732 | 2509 | |
2510 | Insert_After_SPARK_Mode | |
2511 | (Prag => Aitem, | |
2512 | Ins_Nod => First (Decls), | |
2513 | Decls => Decls); | |
d4e369ad | 2514 | |
2515 | else | |
2516 | Error_Msg_NE | |
2517 | ("aspect & must apply to a package declaration", | |
2518 | Aspect, Id); | |
2519 | end if; | |
2520 | ||
2521 | goto Continue; | |
2522 | end Initializes; | |
2523 | ||
1fd4313f | 2524 | -- Obsolescent |
2525 | ||
2526 | when Aspect_Obsolescent => declare | |
2527 | Args : List_Id; | |
2528 | ||
2529 | begin | |
2530 | if No (Expr) then | |
2531 | Args := No_List; | |
2532 | else | |
2533 | Args := New_List ( | |
2534 | Make_Pragma_Argument_Association (Sloc (Expr), | |
2535 | Expression => Relocate_Node (Expr))); | |
2536 | end if; | |
2537 | ||
2538 | Make_Aitem_Pragma | |
2539 | (Pragma_Argument_Associations => Args, | |
2540 | Pragma_Name => Chars (Id)); | |
2541 | end; | |
2542 | ||
5cc6f0cf | 2543 | -- Part_Of |
2544 | ||
2545 | when Aspect_Part_Of => | |
2546 | if Nkind_In (N, N_Object_Declaration, | |
2547 | N_Package_Instantiation) | |
2548 | then | |
2549 | Make_Aitem_Pragma | |
2550 | (Pragma_Argument_Associations => New_List ( | |
2551 | Make_Pragma_Argument_Association (Loc, | |
2552 | Expression => Relocate_Node (Expr))), | |
2553 | Pragma_Name => Name_Part_Of); | |
2554 | ||
2555 | else | |
2556 | Error_Msg_NE | |
2557 | ("aspect & must apply to a variable or package " | |
2558 | & "instantiation", Aspect, Id); | |
2559 | end if; | |
2560 | ||
5dd93a61 | 2561 | -- SPARK_Mode |
2562 | ||
778ebf56 | 2563 | when Aspect_SPARK_Mode => SPARK_Mode : declare |
2564 | Decls : List_Id; | |
2565 | ||
2566 | begin | |
5dd93a61 | 2567 | Make_Aitem_Pragma |
2568 | (Pragma_Argument_Associations => New_List ( | |
2569 | Make_Pragma_Argument_Association (Loc, | |
2570 | Expression => Relocate_Node (Expr))), | |
2571 | Pragma_Name => Name_SPARK_Mode); | |
5dd93a61 | 2572 | |
b90d9656 | 2573 | -- When the aspect appears on a package or a subprogram |
2574 | -- body, insert the generated pragma at the top of the body | |
2575 | -- declarations to emulate the behavior of a source pragma. | |
778ebf56 | 2576 | |
b90d9656 | 2577 | if Nkind_In (N, N_Package_Body, N_Subprogram_Body) then |
e2bf777d | 2578 | Decorate (Aspect, Aitem); |
5cc6f0cf | 2579 | |
778ebf56 | 2580 | Decls := Declarations (N); |
2581 | ||
2582 | if No (Decls) then | |
2583 | Decls := New_List; | |
2584 | Set_Declarations (N, Decls); | |
2585 | end if; | |
2586 | ||
a04f9d2e | 2587 | Prepend_To (Decls, Aitem); |
2588 | goto Continue; | |
2589 | ||
b90d9656 | 2590 | -- When the aspect is associated with a [generic] package |
2591 | -- declaration, insert the generated pragma at the top of | |
2592 | -- the visible declarations to emulate the behavior of a | |
2593 | -- source pragma. | |
a04f9d2e | 2594 | |
b90d9656 | 2595 | elsif Nkind_In (N, N_Generic_Package_Declaration, |
2596 | N_Package_Declaration) | |
2597 | then | |
e2bf777d | 2598 | Decorate (Aspect, Aitem); |
5cc6f0cf | 2599 | |
a04f9d2e | 2600 | Decls := Visible_Declarations (Specification (N)); |
2601 | ||
2602 | if No (Decls) then | |
2603 | Decls := New_List; | |
2604 | Set_Visible_Declarations (Specification (N), Decls); | |
2605 | end if; | |
2606 | ||
778ebf56 | 2607 | Prepend_To (Decls, Aitem); |
2608 | goto Continue; | |
2609 | end if; | |
2610 | end SPARK_Mode; | |
2611 | ||
4befb1a0 | 2612 | -- Refined_Depends |
2613 | ||
e2bf777d | 2614 | -- Aspect Refined_Depends is never delayed because it is |
2615 | -- equivalent to a source pragma which appears in the | |
2616 | -- declarations of the related subprogram body. To deal with | |
2617 | -- forward references, the generated pragma is stored in the | |
2618 | -- contract of the related subprogram body and later analyzed | |
2619 | -- at the end of the declarative region. For details, see | |
2620 | -- routine Analyze_Refined_Depends_In_Decl_Part. | |
4befb1a0 | 2621 | |
2622 | when Aspect_Refined_Depends => | |
422073ed | 2623 | Make_Aitem_Pragma |
2624 | (Pragma_Argument_Associations => New_List ( | |
2625 | Make_Pragma_Argument_Association (Loc, | |
2626 | Expression => Relocate_Node (Expr))), | |
2627 | Pragma_Name => Name_Refined_Depends); | |
2628 | ||
e2bf777d | 2629 | Decorate (Aspect, Aitem); |
2630 | Insert_Pragma (Aitem); | |
422073ed | 2631 | goto Continue; |
4befb1a0 | 2632 | |
2633 | -- Refined_Global | |
2634 | ||
e2bf777d | 2635 | -- Aspect Refined_Global is never delayed because it is |
2636 | -- equivalent to a source pragma which appears in the | |
2637 | -- declarations of the related subprogram body. To deal with | |
2638 | -- forward references, the generated pragma is stored in the | |
2639 | -- contract of the related subprogram body and later analyzed | |
2640 | -- at the end of the declarative region. For details, see | |
2641 | -- routine Analyze_Refined_Global_In_Decl_Part. | |
4befb1a0 | 2642 | |
2643 | when Aspect_Refined_Global => | |
28ff117f | 2644 | Make_Aitem_Pragma |
2645 | (Pragma_Argument_Associations => New_List ( | |
2646 | Make_Pragma_Argument_Association (Loc, | |
2647 | Expression => Relocate_Node (Expr))), | |
2648 | Pragma_Name => Name_Refined_Global); | |
2649 | ||
e2bf777d | 2650 | Decorate (Aspect, Aitem); |
2651 | Insert_Pragma (Aitem); | |
28ff117f | 2652 | goto Continue; |
4befb1a0 | 2653 | |
63b65b2d | 2654 | -- Refined_Post |
2655 | ||
2656 | when Aspect_Refined_Post => | |
2657 | Make_Aitem_Pragma | |
2658 | (Pragma_Argument_Associations => New_List ( | |
2659 | Make_Pragma_Argument_Association (Loc, | |
2660 | Expression => Relocate_Node (Expr))), | |
2661 | Pragma_Name => Name_Refined_Post); | |
2662 | ||
9129c28f | 2663 | -- Refined_State |
2664 | ||
2665 | when Aspect_Refined_State => Refined_State : declare | |
2666 | Decls : List_Id; | |
2667 | ||
2668 | begin | |
2669 | -- The corresponding pragma for Refined_State is inserted in | |
2670 | -- the declarations of the related package body. This action | |
2671 | -- synchronizes both the source and from-aspect versions of | |
2672 | -- the pragma. | |
2673 | ||
2674 | if Nkind (N) = N_Package_Body then | |
e2bf777d | 2675 | Decls := Declarations (N); |
2676 | ||
9129c28f | 2677 | Make_Aitem_Pragma |
2678 | (Pragma_Argument_Associations => New_List ( | |
2679 | Make_Pragma_Argument_Association (Loc, | |
2680 | Expression => Relocate_Node (Expr))), | |
2681 | Pragma_Name => Name_Refined_State); | |
e2bf777d | 2682 | Decorate (Aspect, Aitem); |
b9b2d6e5 | 2683 | |
e2bf777d | 2684 | if No (Decls) then |
2685 | Decls := New_List; | |
2686 | Set_Declarations (N, Decls); | |
2687 | end if; | |
b9b2d6e5 | 2688 | |
e2bf777d | 2689 | -- Pragma Refined_State must be inserted after pragma |
2690 | -- SPARK_Mode in the tree. This ensures that any error | |
2691 | -- messages dependent on SPARK_Mode will be properly | |
2692 | -- enabled/suppressed. | |
b9b2d6e5 | 2693 | |
e2bf777d | 2694 | Insert_After_SPARK_Mode |
2695 | (Prag => Aitem, | |
2696 | Ins_Nod => First (Decls), | |
2697 | Decls => Decls); | |
9129c28f | 2698 | |
2699 | else | |
2700 | Error_Msg_NE | |
2701 | ("aspect & must apply to a package body", Aspect, Id); | |
2702 | end if; | |
2703 | ||
2704 | goto Continue; | |
2705 | end Refined_State; | |
2706 | ||
0fd13d32 | 2707 | -- Relative_Deadline |
3cdbaa5a | 2708 | |
2709 | when Aspect_Relative_Deadline => | |
0fd13d32 | 2710 | Make_Aitem_Pragma |
2711 | (Pragma_Argument_Associations => New_List ( | |
2712 | Make_Pragma_Argument_Association (Loc, | |
2713 | Expression => Relocate_Node (Expr))), | |
2714 | Pragma_Name => Name_Relative_Deadline); | |
47a46747 | 2715 | |
2716 | -- If the aspect applies to a task, the corresponding pragma | |
2717 | -- must appear within its declarations, not after. | |
2718 | ||
2719 | if Nkind (N) = N_Task_Type_Declaration then | |
2720 | declare | |
2721 | Def : Node_Id; | |
2722 | V : List_Id; | |
2723 | ||
2724 | begin | |
2725 | if No (Task_Definition (N)) then | |
2726 | Set_Task_Definition (N, | |
2727 | Make_Task_Definition (Loc, | |
2728 | Visible_Declarations => New_List, | |
2729 | End_Label => Empty)); | |
2730 | end if; | |
2731 | ||
2732 | Def := Task_Definition (N); | |
2733 | V := Visible_Declarations (Def); | |
2734 | if not Is_Empty_List (V) then | |
2735 | Insert_Before (First (V), Aitem); | |
2736 | ||
2737 | else | |
2738 | Set_Visible_Declarations (Def, New_List (Aitem)); | |
2739 | end if; | |
2740 | ||
2741 | goto Continue; | |
2742 | end; | |
2743 | end if; | |
2744 | ||
956ffaf4 | 2745 | -- Case 2e: Annotate aspect |
2746 | ||
2747 | when Aspect_Annotate => | |
2748 | declare | |
2749 | Args : List_Id; | |
2750 | Pargs : List_Id; | |
2751 | Arg : Node_Id; | |
2752 | ||
2753 | begin | |
2754 | -- The argument can be a single identifier | |
2755 | ||
2756 | if Nkind (Expr) = N_Identifier then | |
2757 | ||
2758 | -- One level of parens is allowed | |
2759 | ||
2760 | if Paren_Count (Expr) > 1 then | |
2761 | Error_Msg_F ("extra parentheses ignored", Expr); | |
2762 | end if; | |
2763 | ||
2764 | Set_Paren_Count (Expr, 0); | |
2765 | ||
2766 | -- Add the single item to the list | |
2767 | ||
2768 | Args := New_List (Expr); | |
2769 | ||
2770 | -- Otherwise we must have an aggregate | |
2771 | ||
2772 | elsif Nkind (Expr) = N_Aggregate then | |
2773 | ||
2774 | -- Must be positional | |
2775 | ||
2776 | if Present (Component_Associations (Expr)) then | |
2777 | Error_Msg_F | |
2778 | ("purely positional aggregate required", Expr); | |
2779 | goto Continue; | |
2780 | end if; | |
2781 | ||
2782 | -- Must not be parenthesized | |
2783 | ||
2784 | if Paren_Count (Expr) /= 0 then | |
2785 | Error_Msg_F ("extra parentheses ignored", Expr); | |
2786 | end if; | |
2787 | ||
2788 | -- List of arguments is list of aggregate expressions | |
2789 | ||
2790 | Args := Expressions (Expr); | |
2791 | ||
2792 | -- Anything else is illegal | |
2793 | ||
2794 | else | |
2795 | Error_Msg_F ("wrong form for Annotate aspect", Expr); | |
2796 | goto Continue; | |
2797 | end if; | |
2798 | ||
2799 | -- Prepare pragma arguments | |
2800 | ||
2801 | Pargs := New_List; | |
2802 | Arg := First (Args); | |
2803 | while Present (Arg) loop | |
2804 | Append_To (Pargs, | |
2805 | Make_Pragma_Argument_Association (Sloc (Arg), | |
2806 | Expression => Relocate_Node (Arg))); | |
2807 | Next (Arg); | |
2808 | end loop; | |
2809 | ||
2810 | Append_To (Pargs, | |
2811 | Make_Pragma_Argument_Association (Sloc (Ent), | |
2812 | Chars => Name_Entity, | |
2813 | Expression => Ent)); | |
2814 | ||
2815 | Make_Aitem_Pragma | |
2816 | (Pragma_Argument_Associations => Pargs, | |
2817 | Pragma_Name => Name_Annotate); | |
2818 | end; | |
2819 | ||
89f1e35c | 2820 | -- Case 3 : Aspects that don't correspond to pragma/attribute |
2821 | -- definition clause. | |
7b9b2f05 | 2822 | |
89f1e35c | 2823 | -- Case 3a: The aspects listed below don't correspond to |
2824 | -- pragmas/attributes but do require delayed analysis. | |
7f694ca2 | 2825 | |
51fa2a45 | 2826 | -- Default_Value can only apply to a scalar type |
2827 | ||
2828 | when Aspect_Default_Value => | |
2829 | if not Is_Scalar_Type (E) then | |
2830 | Error_Msg_N | |
1089ff19 | 2831 | ("aspect Default_Value must apply to a scalar type", N); |
51fa2a45 | 2832 | end if; |
2833 | ||
2834 | Aitem := Empty; | |
2835 | ||
2836 | -- Default_Component_Value can only apply to an array type | |
2837 | -- with scalar components. | |
2838 | ||
2839 | when Aspect_Default_Component_Value => | |
2840 | if not (Is_Array_Type (E) | |
3f4c9ffc | 2841 | and then Is_Scalar_Type (Component_Type (E))) |
51fa2a45 | 2842 | then |
2843 | Error_Msg_N ("aspect Default_Component_Value can only " | |
2844 | & "apply to an array of scalar components", N); | |
2845 | end if; | |
0fd13d32 | 2846 | |
89f1e35c | 2847 | Aitem := Empty; |
7f694ca2 | 2848 | |
89f1e35c | 2849 | -- Case 3b: The aspects listed below don't correspond to |
2850 | -- pragmas/attributes and don't need delayed analysis. | |
95bc75fa | 2851 | |
0fd13d32 | 2852 | -- Implicit_Dereference |
2853 | ||
89f1e35c | 2854 | -- For Implicit_Dereference, External_Name and Link_Name, only |
2855 | -- the legality checks are done during the analysis, thus no | |
2856 | -- delay is required. | |
a8e38e1d | 2857 | |
89f1e35c | 2858 | when Aspect_Implicit_Dereference => |
2859 | Analyze_Aspect_Implicit_Dereference; | |
2860 | goto Continue; | |
7f694ca2 | 2861 | |
0fd13d32 | 2862 | -- External_Name, Link_Name |
2863 | ||
89f1e35c | 2864 | when Aspect_External_Name | |
2865 | Aspect_Link_Name => | |
2866 | Analyze_Aspect_External_Or_Link_Name; | |
2867 | goto Continue; | |
7f694ca2 | 2868 | |
0fd13d32 | 2869 | -- Dimension |
2870 | ||
89f1e35c | 2871 | when Aspect_Dimension => |
2872 | Analyze_Aspect_Dimension (N, Id, Expr); | |
2873 | goto Continue; | |
cb4c311d | 2874 | |
0fd13d32 | 2875 | -- Dimension_System |
2876 | ||
89f1e35c | 2877 | when Aspect_Dimension_System => |
2878 | Analyze_Aspect_Dimension_System (N, Id, Expr); | |
2879 | goto Continue; | |
7f694ca2 | 2880 | |
ceec4f7c | 2881 | -- Case 4: Aspects requiring special handling |
51ea9c94 | 2882 | |
e66f4e2a | 2883 | -- Pre/Post/Test_Case/Contract_Cases whose corresponding |
2884 | -- pragmas take care of the delay. | |
7f694ca2 | 2885 | |
0fd13d32 | 2886 | -- Pre/Post |
2887 | ||
1e3c4ae6 | 2888 | -- Aspects Pre/Post generate Precondition/Postcondition pragmas |
2889 | -- with a first argument that is the expression, and a second | |
2890 | -- argument that is an informative message if the test fails. | |
2891 | -- This is inserted right after the declaration, to get the | |
5b5df4a9 | 2892 | -- required pragma placement. The processing for the pragmas |
2893 | -- takes care of the required delay. | |
ae888dbd | 2894 | |
5ddd846b | 2895 | when Pre_Post_Aspects => Pre_Post : declare |
1e3c4ae6 | 2896 | Pname : Name_Id; |
ae888dbd | 2897 | |
1e3c4ae6 | 2898 | begin |
77ae6789 | 2899 | if A_Id = Aspect_Pre or else A_Id = Aspect_Precondition then |
1e3c4ae6 | 2900 | Pname := Name_Precondition; |
2901 | else | |
2902 | Pname := Name_Postcondition; | |
2903 | end if; | |
d74fc39a | 2904 | |
1e3c4ae6 | 2905 | -- If the expressions is of the form A and then B, then |
2906 | -- we generate separate Pre/Post aspects for the separate | |
2907 | -- clauses. Since we allow multiple pragmas, there is no | |
2908 | -- problem in allowing multiple Pre/Post aspects internally. | |
a273015d | 2909 | -- These should be treated in reverse order (B first and |
2910 | -- A second) since they are later inserted just after N in | |
2911 | -- the order they are treated. This way, the pragma for A | |
2912 | -- ends up preceding the pragma for B, which may have an | |
2913 | -- importance for the error raised (either constraint error | |
2914 | -- or precondition error). | |
1e3c4ae6 | 2915 | |
39e1f22f | 2916 | -- We do not do this for Pre'Class, since we have to put |
51fa2a45 | 2917 | -- these conditions together in a complex OR expression. |
ae888dbd | 2918 | |
4282d342 | 2919 | -- We do not do this in ASIS mode, as ASIS relies on the |
2920 | -- original node representing the complete expression, when | |
2921 | -- retrieving it through the source aspect table. | |
2922 | ||
2923 | if not ASIS_Mode | |
2924 | and then (Pname = Name_Postcondition | |
2925 | or else not Class_Present (Aspect)) | |
39e1f22f | 2926 | then |
2927 | while Nkind (Expr) = N_And_Then loop | |
2928 | Insert_After (Aspect, | |
a273015d | 2929 | Make_Aspect_Specification (Sloc (Left_Opnd (Expr)), |
39e1f22f | 2930 | Identifier => Identifier (Aspect), |
a273015d | 2931 | Expression => Relocate_Node (Left_Opnd (Expr)), |
39e1f22f | 2932 | Class_Present => Class_Present (Aspect), |
2933 | Split_PPC => True)); | |
a273015d | 2934 | Rewrite (Expr, Relocate_Node (Right_Opnd (Expr))); |
39e1f22f | 2935 | Eloc := Sloc (Expr); |
2936 | end loop; | |
2937 | end if; | |
ae888dbd | 2938 | |
48d6f069 | 2939 | -- Build the precondition/postcondition pragma |
2940 | ||
51fa2a45 | 2941 | -- Add note about why we do NOT need Copy_Tree here??? |
d74fc39a | 2942 | |
0fd13d32 | 2943 | Make_Aitem_Pragma |
2944 | (Pragma_Argument_Associations => New_List ( | |
2945 | Make_Pragma_Argument_Association (Eloc, | |
2946 | Chars => Name_Check, | |
a19e1763 | 2947 | Expression => Relocate_Node (Expr))), |
0fd13d32 | 2948 | Pragma_Name => Pname); |
39e1f22f | 2949 | |
2950 | -- Add message unless exception messages are suppressed | |
2951 | ||
2952 | if not Opt.Exception_Locations_Suppressed then | |
2953 | Append_To (Pragma_Argument_Associations (Aitem), | |
2954 | Make_Pragma_Argument_Association (Eloc, | |
ed695684 | 2955 | Chars => Name_Message, |
39e1f22f | 2956 | Expression => |
2957 | Make_String_Literal (Eloc, | |
2958 | Strval => "failed " | |
2959 | & Get_Name_String (Pname) | |
2960 | & " from " | |
2961 | & Build_Location_String (Eloc)))); | |
2962 | end if; | |
d74fc39a | 2963 | |
7d20685d | 2964 | Set_Is_Delayed_Aspect (Aspect); |
d74fc39a | 2965 | |
1e3c4ae6 | 2966 | -- For Pre/Post cases, insert immediately after the entity |
2967 | -- declaration, since that is the required pragma placement. | |
2968 | -- Note that for these aspects, we do not have to worry | |
2969 | -- about delay issues, since the pragmas themselves deal | |
2970 | -- with delay of visibility for the expression analysis. | |
2971 | ||
e2bf777d | 2972 | Insert_Pragma (Aitem); |
299b347e | 2973 | |
1e3c4ae6 | 2974 | goto Continue; |
5ddd846b | 2975 | end Pre_Post; |
ae888dbd | 2976 | |
0fd13d32 | 2977 | -- Test_Case |
2978 | ||
e66f4e2a | 2979 | when Aspect_Test_Case => Test_Case : declare |
2980 | Args : List_Id; | |
2981 | Comp_Expr : Node_Id; | |
2982 | Comp_Assn : Node_Id; | |
2983 | New_Expr : Node_Id; | |
57cd943b | 2984 | |
e66f4e2a | 2985 | begin |
2986 | Args := New_List; | |
b0bc40fd | 2987 | |
e66f4e2a | 2988 | if Nkind (Parent (N)) = N_Compilation_Unit then |
2989 | Error_Msg_Name_1 := Nam; | |
2990 | Error_Msg_N ("incorrect placement of aspect `%`", E); | |
2991 | goto Continue; | |
2992 | end if; | |
6c545057 | 2993 | |
e66f4e2a | 2994 | if Nkind (Expr) /= N_Aggregate then |
2995 | Error_Msg_Name_1 := Nam; | |
2996 | Error_Msg_NE | |
2997 | ("wrong syntax for aspect `%` for &", Id, E); | |
2998 | goto Continue; | |
2999 | end if; | |
6c545057 | 3000 | |
e66f4e2a | 3001 | -- Make pragma expressions refer to the original aspect |
51fa2a45 | 3002 | -- expressions through the Original_Node link. This is used |
3003 | -- in semantic analysis for ASIS mode, so that the original | |
3004 | -- expression also gets analyzed. | |
e66f4e2a | 3005 | |
3006 | Comp_Expr := First (Expressions (Expr)); | |
3007 | while Present (Comp_Expr) loop | |
3008 | New_Expr := Relocate_Node (Comp_Expr); | |
e66f4e2a | 3009 | Append_To (Args, |
3010 | Make_Pragma_Argument_Association (Sloc (Comp_Expr), | |
3011 | Expression => New_Expr)); | |
3012 | Next (Comp_Expr); | |
3013 | end loop; | |
3014 | ||
3015 | Comp_Assn := First (Component_Associations (Expr)); | |
3016 | while Present (Comp_Assn) loop | |
3017 | if List_Length (Choices (Comp_Assn)) /= 1 | |
3018 | or else | |
3019 | Nkind (First (Choices (Comp_Assn))) /= N_Identifier | |
3020 | then | |
fad014fe | 3021 | Error_Msg_Name_1 := Nam; |
6c545057 | 3022 | Error_Msg_NE |
fad014fe | 3023 | ("wrong syntax for aspect `%` for &", Id, E); |
6c545057 | 3024 | goto Continue; |
3025 | end if; | |
3026 | ||
e66f4e2a | 3027 | Append_To (Args, |
3028 | Make_Pragma_Argument_Association (Sloc (Comp_Assn), | |
ed695684 | 3029 | Chars => Chars (First (Choices (Comp_Assn))), |
3030 | Expression => | |
3031 | Relocate_Node (Expression (Comp_Assn)))); | |
e66f4e2a | 3032 | Next (Comp_Assn); |
3033 | end loop; | |
6c545057 | 3034 | |
e66f4e2a | 3035 | -- Build the test-case pragma |
6c545057 | 3036 | |
0fd13d32 | 3037 | Make_Aitem_Pragma |
3038 | (Pragma_Argument_Associations => Args, | |
3039 | Pragma_Name => Nam); | |
e66f4e2a | 3040 | end Test_Case; |
85696508 | 3041 | |
0fd13d32 | 3042 | -- Contract_Cases |
3043 | ||
5ddd846b | 3044 | when Aspect_Contract_Cases => |
0fd13d32 | 3045 | Make_Aitem_Pragma |
3046 | (Pragma_Argument_Associations => New_List ( | |
3047 | Make_Pragma_Argument_Association (Loc, | |
3048 | Expression => Relocate_Node (Expr))), | |
3049 | Pragma_Name => Nam); | |
3a128918 | 3050 | |
e2bf777d | 3051 | Decorate (Aspect, Aitem); |
3052 | Insert_Pragma (Aitem); | |
5ddd846b | 3053 | goto Continue; |
3a128918 | 3054 | |
89f1e35c | 3055 | -- Case 5: Special handling for aspects with an optional |
3056 | -- boolean argument. | |
85696508 | 3057 | |
89f1e35c | 3058 | -- In the general case, the corresponding pragma cannot be |
0fd13d32 | 3059 | -- generated yet because the evaluation of the boolean needs |
3060 | -- to be delayed till the freeze point. | |
3061 | ||
89f1e35c | 3062 | when Boolean_Aspects | |
3063 | Library_Unit_Aspects => | |
a5a64273 | 3064 | |
89f1e35c | 3065 | Set_Is_Boolean_Aspect (Aspect); |
a5a64273 | 3066 | |
89f1e35c | 3067 | -- Lock_Free aspect only apply to protected objects |
e1cedbae | 3068 | |
89f1e35c | 3069 | if A_Id = Aspect_Lock_Free then |
3070 | if Ekind (E) /= E_Protected_Type then | |
99a2d5bd | 3071 | Error_Msg_Name_1 := Nam; |
a5a64273 | 3072 | Error_Msg_N |
89f1e35c | 3073 | ("aspect % only applies to a protected object", |
3074 | Aspect); | |
3075 | ||
3076 | else | |
3077 | -- Set the Uses_Lock_Free flag to True if there is no | |
37c6e44c | 3078 | -- expression or if the expression is True. The |
89f1e35c | 3079 | -- evaluation of this aspect should be delayed to the |
37c6e44c | 3080 | -- freeze point (why???) |
89f1e35c | 3081 | |
e81df51c | 3082 | if No (Expr) |
3083 | or else Is_True (Static_Boolean (Expr)) | |
89f1e35c | 3084 | then |
3085 | Set_Uses_Lock_Free (E); | |
3086 | end if; | |
caf125ce | 3087 | |
3088 | Record_Rep_Item (E, Aspect); | |
a5a64273 | 3089 | end if; |
e1cedbae | 3090 | |
89f1e35c | 3091 | goto Continue; |
ae888dbd | 3092 | |
17631aa0 | 3093 | elsif A_Id = Aspect_Import or else A_Id = Aspect_Export then |
d74fc39a | 3094 | |
39616053 | 3095 | -- For the case of aspects Import and Export, we don't |
3096 | -- consider that we know the entity is never set in the | |
3097 | -- source, since it is is likely modified outside the | |
3098 | -- program. | |
3099 | ||
3100 | -- Note: one might think that the analysis of the | |
3101 | -- resulting pragma would take care of that, but | |
3102 | -- that's not the case since it won't be from source. | |
3103 | ||
3104 | if Ekind (E) = E_Variable then | |
3105 | Set_Never_Set_In_Source (E, False); | |
3106 | end if; | |
3107 | ||
2e1821c9 | 3108 | -- In older versions of Ada the corresponding pragmas |
51fa2a45 | 3109 | -- specified a Convention. In Ada 2012 the convention is |
3110 | -- specified as a separate aspect, and it is optional, | |
2e1821c9 | 3111 | -- given that it defaults to Convention_Ada. The code |
3112 | -- that verifed that there was a matching convention | |
3113 | -- is now obsolete. | |
d74fc39a | 3114 | |
718d0d92 | 3115 | -- Resolve the expression of an Import or Export here, |
3116 | -- and require it to be of type Boolean and static. This | |
3117 | -- is not quite right, because in general this should be | |
3118 | -- delayed, but that seems tricky for these, because | |
3119 | -- normally Boolean aspects are replaced with pragmas at | |
3120 | -- the freeze point (in Make_Pragma_From_Boolean_Aspect), | |
3121 | -- but in the case of these aspects we can't generate | |
3122 | -- a simple pragma with just the entity name. ??? | |
3123 | ||
3124 | if not Present (Expr) | |
3125 | or else Is_True (Static_Boolean (Expr)) | |
3126 | then | |
3127 | if A_Id = Aspect_Import then | |
3128 | Set_Is_Imported (E); | |
19a2e7b4 | 3129 | Set_Has_Completion (E); |
dd4c44af | 3130 | |
718d0d92 | 3131 | -- An imported entity cannot have an explicit |
3132 | -- initialization. | |
dd4c44af | 3133 | |
718d0d92 | 3134 | if Nkind (N) = N_Object_Declaration |
3135 | and then Present (Expression (N)) | |
3136 | then | |
3137 | Error_Msg_N | |
3138 | ("imported entities cannot be initialized " | |
3139 | & "(RM B.1(24))", Expression (N)); | |
3140 | end if; | |
3141 | ||
3142 | elsif A_Id = Aspect_Export then | |
3143 | Set_Is_Exported (E); | |
dd4c44af | 3144 | end if; |
3145 | end if; | |
3146 | ||
89f1e35c | 3147 | goto Continue; |
3148 | end if; | |
d74fc39a | 3149 | |
37c6e44c | 3150 | -- Library unit aspects require special handling in the case |
3151 | -- of a package declaration, the pragma needs to be inserted | |
3152 | -- in the list of declarations for the associated package. | |
3153 | -- There is no issue of visibility delay for these aspects. | |
d64221a7 | 3154 | |
89f1e35c | 3155 | if A_Id in Library_Unit_Aspects |
178fec9b | 3156 | and then |
3157 | Nkind_In (N, N_Package_Declaration, | |
3158 | N_Generic_Package_Declaration) | |
89f1e35c | 3159 | and then Nkind (Parent (N)) /= N_Compilation_Unit |
3ad60f63 | 3160 | |
3161 | -- Aspect is legal on a local instantiation of a library- | |
3162 | -- level generic unit. | |
3163 | ||
b94a633e | 3164 | and then not Is_Generic_Instance (Defining_Entity (N)) |
89f1e35c | 3165 | then |
3166 | Error_Msg_N | |
dd4c44af | 3167 | ("incorrect context for library unit aspect&", Id); |
89f1e35c | 3168 | goto Continue; |
3169 | end if; | |
cce84b09 | 3170 | |
294709fa | 3171 | -- External property aspects are Boolean by nature, but |
3172 | -- their pragmas must contain two arguments, the second | |
3173 | -- being the optional Boolean expression. | |
3174 | ||
a7ed0410 | 3175 | if A_Id = Aspect_Async_Readers or else |
3176 | A_Id = Aspect_Async_Writers or else | |
3177 | A_Id = Aspect_Effective_Reads or else | |
3178 | A_Id = Aspect_Effective_Writes | |
294709fa | 3179 | then |
3180 | declare | |
3181 | Args : List_Id; | |
3182 | ||
3183 | begin | |
3184 | -- The first argument of the external property pragma | |
3185 | -- is the related object. | |
3186 | ||
a7ed0410 | 3187 | Args := |
3188 | New_List ( | |
3189 | Make_Pragma_Argument_Association (Sloc (Ent), | |
3190 | Expression => Ent)); | |
294709fa | 3191 | |
3192 | -- The second argument is the optional Boolean | |
3193 | -- expression which must be propagated even if it | |
3194 | -- evaluates to False as this has special semantic | |
3195 | -- meaning. | |
3196 | ||
3197 | if Present (Expr) then | |
3198 | Append_To (Args, | |
3199 | Make_Pragma_Argument_Association (Loc, | |
3200 | Expression => Relocate_Node (Expr))); | |
3201 | end if; | |
3202 | ||
3203 | Make_Aitem_Pragma | |
3204 | (Pragma_Argument_Associations => Args, | |
3205 | Pragma_Name => Nam); | |
3206 | end; | |
3207 | ||
51fa2a45 | 3208 | -- Cases where we do not delay, includes all cases where the |
3209 | -- expression is missing other than the above cases. | |
d74fc39a | 3210 | |
294709fa | 3211 | elsif not Delay_Required or else No (Expr) then |
0fd13d32 | 3212 | Make_Aitem_Pragma |
3213 | (Pragma_Argument_Associations => New_List ( | |
3214 | Make_Pragma_Argument_Association (Sloc (Ent), | |
3215 | Expression => Ent)), | |
3216 | Pragma_Name => Chars (Id)); | |
89f1e35c | 3217 | Delay_Required := False; |
ddf1337b | 3218 | |
89f1e35c | 3219 | -- In general cases, the corresponding pragma/attribute |
3220 | -- definition clause will be inserted later at the freezing | |
294709fa | 3221 | -- point, and we do not need to build it now. |
ddf1337b | 3222 | |
89f1e35c | 3223 | else |
3224 | Aitem := Empty; | |
3225 | end if; | |
ceec4f7c | 3226 | |
3227 | -- Storage_Size | |
3228 | ||
3229 | -- This is special because for access types we need to generate | |
3230 | -- an attribute definition clause. This also works for single | |
3231 | -- task declarations, but it does not work for task type | |
3232 | -- declarations, because we have the case where the expression | |
3233 | -- references a discriminant of the task type. That can't use | |
3234 | -- an attribute definition clause because we would not have | |
3235 | -- visibility on the discriminant. For that case we must | |
3236 | -- generate a pragma in the task definition. | |
3237 | ||
3238 | when Aspect_Storage_Size => | |
3239 | ||
3240 | -- Task type case | |
3241 | ||
3242 | if Ekind (E) = E_Task_Type then | |
3243 | declare | |
3244 | Decl : constant Node_Id := Declaration_Node (E); | |
3245 | ||
3246 | begin | |
3247 | pragma Assert (Nkind (Decl) = N_Task_Type_Declaration); | |
3248 | ||
3249 | -- If no task definition, create one | |
3250 | ||
3251 | if No (Task_Definition (Decl)) then | |
3252 | Set_Task_Definition (Decl, | |
3253 | Make_Task_Definition (Loc, | |
3254 | Visible_Declarations => Empty_List, | |
3255 | End_Label => Empty)); | |
3256 | end if; | |
3257 | ||
51fa2a45 | 3258 | -- Create a pragma and put it at the start of the task |
3259 | -- definition for the task type declaration. | |
ceec4f7c | 3260 | |
3261 | Make_Aitem_Pragma | |
3262 | (Pragma_Argument_Associations => New_List ( | |
3263 | Make_Pragma_Argument_Association (Loc, | |
3264 | Expression => Relocate_Node (Expr))), | |
3265 | Pragma_Name => Name_Storage_Size); | |
3266 | ||
3267 | Prepend | |
3268 | (Aitem, | |
3269 | Visible_Declarations (Task_Definition (Decl))); | |
3270 | goto Continue; | |
3271 | end; | |
3272 | ||
3273 | -- All other cases, generate attribute definition | |
3274 | ||
3275 | else | |
3276 | Aitem := | |
3277 | Make_Attribute_Definition_Clause (Loc, | |
3278 | Name => Ent, | |
3279 | Chars => Chars (Id), | |
3280 | Expression => Relocate_Node (Expr)); | |
3281 | end if; | |
89f1e35c | 3282 | end case; |
ddf1337b | 3283 | |
89f1e35c | 3284 | -- Attach the corresponding pragma/attribute definition clause to |
3285 | -- the aspect specification node. | |
d74fc39a | 3286 | |
89f1e35c | 3287 | if Present (Aitem) then |
e2bf777d | 3288 | Set_From_Aspect_Specification (Aitem); |
89f1e35c | 3289 | end if; |
53c179ea | 3290 | |
89f1e35c | 3291 | -- In the context of a compilation unit, we directly put the |
0fd13d32 | 3292 | -- pragma in the Pragmas_After list of the N_Compilation_Unit_Aux |
3293 | -- node (no delay is required here) except for aspects on a | |
51fa2a45 | 3294 | -- subprogram body (see below) and a generic package, for which we |
3295 | -- need to introduce the pragma before building the generic copy | |
3296 | -- (see sem_ch12), and for package instantiations, where the | |
3297 | -- library unit pragmas are better handled early. | |
ddf1337b | 3298 | |
9129c28f | 3299 | if Nkind (Parent (N)) = N_Compilation_Unit |
89f1e35c | 3300 | and then (Present (Aitem) or else Is_Boolean_Aspect (Aspect)) |
3301 | then | |
3302 | declare | |
3303 | Aux : constant Node_Id := Aux_Decls_Node (Parent (N)); | |
7f694ca2 | 3304 | |
89f1e35c | 3305 | begin |
3306 | pragma Assert (Nkind (Aux) = N_Compilation_Unit_Aux); | |
7f694ca2 | 3307 | |
89f1e35c | 3308 | -- For a Boolean aspect, create the corresponding pragma if |
3309 | -- no expression or if the value is True. | |
7f694ca2 | 3310 | |
b9e61b2a | 3311 | if Is_Boolean_Aspect (Aspect) and then No (Aitem) then |
89f1e35c | 3312 | if Is_True (Static_Boolean (Expr)) then |
0fd13d32 | 3313 | Make_Aitem_Pragma |
3314 | (Pragma_Argument_Associations => New_List ( | |
3315 | Make_Pragma_Argument_Association (Sloc (Ent), | |
3316 | Expression => Ent)), | |
3317 | Pragma_Name => Chars (Id)); | |
7f694ca2 | 3318 | |
89f1e35c | 3319 | Set_From_Aspect_Specification (Aitem, True); |
3320 | Set_Corresponding_Aspect (Aitem, Aspect); | |
3321 | ||
3322 | else | |
3323 | goto Continue; | |
3324 | end if; | |
3325 | end if; | |
7f694ca2 | 3326 | |
d6814978 | 3327 | -- If the aspect is on a subprogram body (relevant aspect |
3328 | -- is Inline), add the pragma in front of the declarations. | |
3a72f9c3 | 3329 | |
3330 | if Nkind (N) = N_Subprogram_Body then | |
3331 | if No (Declarations (N)) then | |
3332 | Set_Declarations (N, New_List); | |
3333 | end if; | |
3334 | ||
3335 | Prepend (Aitem, Declarations (N)); | |
3336 | ||
178fec9b | 3337 | elsif Nkind (N) = N_Generic_Package_Declaration then |
3338 | if No (Visible_Declarations (Specification (N))) then | |
3339 | Set_Visible_Declarations (Specification (N), New_List); | |
3340 | end if; | |
3341 | ||
3342 | Prepend (Aitem, | |
3343 | Visible_Declarations (Specification (N))); | |
3344 | ||
c39cce40 | 3345 | elsif Nkind (N) = N_Package_Instantiation then |
df8b0dae | 3346 | declare |
3347 | Spec : constant Node_Id := | |
3348 | Specification (Instance_Spec (N)); | |
3349 | begin | |
3350 | if No (Visible_Declarations (Spec)) then | |
3351 | Set_Visible_Declarations (Spec, New_List); | |
3352 | end if; | |
3353 | ||
3354 | Prepend (Aitem, Visible_Declarations (Spec)); | |
3355 | end; | |
3356 | ||
3a72f9c3 | 3357 | else |
3358 | if No (Pragmas_After (Aux)) then | |
d4596fbe | 3359 | Set_Pragmas_After (Aux, New_List); |
3a72f9c3 | 3360 | end if; |
3361 | ||
3362 | Append (Aitem, Pragmas_After (Aux)); | |
89f1e35c | 3363 | end if; |
7f694ca2 | 3364 | |
89f1e35c | 3365 | goto Continue; |
3366 | end; | |
3367 | end if; | |
7f694ca2 | 3368 | |
89f1e35c | 3369 | -- The evaluation of the aspect is delayed to the freezing point. |
3370 | -- The pragma or attribute clause if there is one is then attached | |
37c6e44c | 3371 | -- to the aspect specification which is put in the rep item list. |
1a814552 | 3372 | |
89f1e35c | 3373 | if Delay_Required then |
3374 | if Present (Aitem) then | |
3375 | Set_Is_Delayed_Aspect (Aitem); | |
3376 | Set_Aspect_Rep_Item (Aspect, Aitem); | |
3377 | Set_Parent (Aitem, Aspect); | |
3378 | end if; | |
1a814552 | 3379 | |
89f1e35c | 3380 | Set_Is_Delayed_Aspect (Aspect); |
9f36e3fb | 3381 | |
cba2ae82 | 3382 | -- In the case of Default_Value, link the aspect to base type |
3383 | -- as well, even though it appears on a first subtype. This is | |
3384 | -- mandated by the semantics of the aspect. Do not establish | |
3385 | -- the link when processing the base type itself as this leads | |
3386 | -- to a rep item circularity. Verify that we are dealing with | |
3387 | -- a scalar type to prevent cascaded errors. | |
3388 | ||
3389 | if A_Id = Aspect_Default_Value | |
3390 | and then Is_Scalar_Type (E) | |
3391 | and then Base_Type (E) /= E | |
3392 | then | |
9f36e3fb | 3393 | Set_Has_Delayed_Aspects (Base_Type (E)); |
3394 | Record_Rep_Item (Base_Type (E), Aspect); | |
3395 | end if; | |
3396 | ||
89f1e35c | 3397 | Set_Has_Delayed_Aspects (E); |
3398 | Record_Rep_Item (E, Aspect); | |
ddf1337b | 3399 | |
b855559d | 3400 | -- When delay is not required and the context is a package or a |
3401 | -- subprogram body, insert the pragma in the body declarations. | |
f55ce169 | 3402 | |
b855559d | 3403 | elsif Nkind_In (N, N_Package_Body, N_Subprogram_Body) then |
f55ce169 | 3404 | if No (Declarations (N)) then |
3405 | Set_Declarations (N, New_List); | |
3406 | end if; | |
3407 | ||
3408 | -- The pragma is added before source declarations | |
3409 | ||
3410 | Prepend_To (Declarations (N), Aitem); | |
3411 | ||
89f1e35c | 3412 | -- When delay is not required and the context is not a compilation |
3413 | -- unit, we simply insert the pragma/attribute definition clause | |
3414 | -- in sequence. | |
ddf1337b | 3415 | |
89f1e35c | 3416 | else |
3417 | Insert_After (Ins_Node, Aitem); | |
3418 | Ins_Node := Aitem; | |
d74fc39a | 3419 | end if; |
0fd13d32 | 3420 | end Analyze_One_Aspect; |
ae888dbd | 3421 | |
d64221a7 | 3422 | <<Continue>> |
3423 | Next (Aspect); | |
21ea3a4f | 3424 | end loop Aspect_Loop; |
89f1e35c | 3425 | |
3426 | if Has_Delayed_Aspects (E) then | |
3427 | Ensure_Freeze_Node (E); | |
3428 | end if; | |
21ea3a4f | 3429 | end Analyze_Aspect_Specifications; |
ae888dbd | 3430 | |
eb8aeefc | 3431 | --------------------------------------------------- |
3432 | -- Analyze_Aspect_Specifications_On_Body_Or_Stub -- | |
3433 | --------------------------------------------------- | |
3434 | ||
3435 | procedure Analyze_Aspect_Specifications_On_Body_Or_Stub (N : Node_Id) is | |
3436 | Body_Id : constant Entity_Id := Defining_Entity (N); | |
3437 | ||
3438 | procedure Diagnose_Misplaced_Aspects (Spec_Id : Entity_Id); | |
3439 | -- Subprogram body [stub] N has aspects, but they are not properly | |
3440 | -- placed. Emit an error message depending on the aspects involved. | |
3441 | -- Spec_Id is the entity of the corresponding spec. | |
3442 | ||
3443 | -------------------------------- | |
3444 | -- Diagnose_Misplaced_Aspects -- | |
3445 | -------------------------------- | |
3446 | ||
3447 | procedure Diagnose_Misplaced_Aspects (Spec_Id : Entity_Id) is | |
3448 | procedure Misplaced_Aspect_Error | |
3449 | (Asp : Node_Id; | |
3450 | Ref_Nam : Name_Id); | |
3451 | -- Emit an error message concerning misplaced aspect Asp. Ref_Nam is | |
3452 | -- the name of the refined version of the aspect. | |
3453 | ||
3454 | ---------------------------- | |
3455 | -- Misplaced_Aspect_Error -- | |
3456 | ---------------------------- | |
3457 | ||
3458 | procedure Misplaced_Aspect_Error | |
3459 | (Asp : Node_Id; | |
3460 | Ref_Nam : Name_Id) | |
3461 | is | |
3462 | Asp_Nam : constant Name_Id := Chars (Identifier (Asp)); | |
3463 | Asp_Id : constant Aspect_Id := Get_Aspect_Id (Asp_Nam); | |
3464 | ||
3465 | begin | |
3466 | -- The corresponding spec already contains the aspect in question | |
3467 | -- and the one appearing on the body must be the refined form: | |
3468 | ||
3469 | -- procedure P with Global ...; | |
3470 | -- procedure P with Global ... is ... end P; | |
3471 | -- ^ | |
3472 | -- Refined_Global | |
3473 | ||
3474 | if Has_Aspect (Spec_Id, Asp_Id) then | |
3475 | Error_Msg_Name_1 := Asp_Nam; | |
3476 | ||
3477 | -- Subunits cannot carry aspects that apply to a subprogram | |
3478 | -- declaration. | |
3479 | ||
3480 | if Nkind (Parent (N)) = N_Subunit then | |
3481 | Error_Msg_N ("aspect % cannot apply to a subunit", Asp); | |
3482 | ||
3483 | -- Otherwise suggest the refined form | |
3484 | ||
3485 | else | |
3486 | Error_Msg_Name_2 := Ref_Nam; | |
3487 | Error_Msg_N ("aspect % should be %", Asp); | |
3488 | end if; | |
3489 | ||
3490 | -- Otherwise the aspect must appear on the spec, not on the body | |
3491 | ||
3492 | -- procedure P; | |
3493 | -- procedure P with Global ... is ... end P; | |
3494 | ||
3495 | else | |
3496 | Error_Msg_N | |
3497 | ("aspect specification must appear in subprogram declaration", | |
3498 | Asp); | |
3499 | end if; | |
3500 | end Misplaced_Aspect_Error; | |
3501 | ||
3502 | -- Local variables | |
3503 | ||
3504 | Asp : Node_Id; | |
3505 | Asp_Nam : Name_Id; | |
3506 | ||
3507 | -- Start of processing for Diagnose_Misplaced_Aspects | |
3508 | ||
3509 | begin | |
3510 | -- Iterate over the aspect specifications and emit specific errors | |
3511 | -- where applicable. | |
3512 | ||
3513 | Asp := First (Aspect_Specifications (N)); | |
3514 | while Present (Asp) loop | |
3515 | Asp_Nam := Chars (Identifier (Asp)); | |
3516 | ||
3517 | -- Do not emit errors on aspects that can appear on a subprogram | |
3518 | -- body. This scenario occurs when the aspect specification list | |
3519 | -- contains both misplaced and properly placed aspects. | |
3520 | ||
3521 | if Aspect_On_Body_Or_Stub_OK (Get_Aspect_Id (Asp_Nam)) then | |
3522 | null; | |
3523 | ||
3524 | -- Special diagnostics for SPARK aspects | |
3525 | ||
3526 | elsif Asp_Nam = Name_Depends then | |
3527 | Misplaced_Aspect_Error (Asp, Name_Refined_Depends); | |
3528 | ||
3529 | elsif Asp_Nam = Name_Global then | |
3530 | Misplaced_Aspect_Error (Asp, Name_Refined_Global); | |
3531 | ||
3532 | elsif Asp_Nam = Name_Post then | |
3533 | Misplaced_Aspect_Error (Asp, Name_Refined_Post); | |
3534 | ||
3535 | -- Otherwise a language-defined aspect is misplaced | |
3536 | ||
3537 | else | |
3538 | Error_Msg_N | |
3539 | ("aspect specification must appear in subprogram declaration", | |
3540 | Asp); | |
3541 | end if; | |
3542 | ||
3543 | Next (Asp); | |
3544 | end loop; | |
3545 | end Diagnose_Misplaced_Aspects; | |
3546 | ||
3547 | -- Local variables | |
3548 | ||
3549 | Spec_Id : Entity_Id; | |
3550 | ||
3551 | -- Start of processing for Analyze_Aspects_On_Body_Or_Stub | |
3552 | ||
3553 | begin | |
3554 | if Nkind (N) = N_Subprogram_Body_Stub then | |
3555 | Spec_Id := Corresponding_Spec_Of_Stub (N); | |
3556 | else | |
3557 | Spec_Id := Corresponding_Spec (N); | |
3558 | end if; | |
3559 | ||
3560 | -- Language-defined aspects cannot be associated with a subprogram body | |
3561 | -- [stub] if the subprogram has a spec. Certain implementation defined | |
3562 | -- aspects are allowed to break this rule (for all applicable cases, see | |
3563 | -- table Aspects.Aspect_On_Body_Or_Stub_OK). | |
3564 | ||
3565 | if Present (Spec_Id) and then not Aspects_On_Body_Or_Stub_OK (N) then | |
3566 | Diagnose_Misplaced_Aspects (Spec_Id); | |
3567 | else | |
3568 | Analyze_Aspect_Specifications (N, Body_Id); | |
3569 | end if; | |
3570 | end Analyze_Aspect_Specifications_On_Body_Or_Stub; | |
3571 | ||
d6f39728 | 3572 | ----------------------- |
3573 | -- Analyze_At_Clause -- | |
3574 | ----------------------- | |
3575 | ||
3576 | -- An at clause is replaced by the corresponding Address attribute | |
3577 | -- definition clause that is the preferred approach in Ada 95. | |
3578 | ||
3579 | procedure Analyze_At_Clause (N : Node_Id) is | |
177675a7 | 3580 | CS : constant Boolean := Comes_From_Source (N); |
3581 | ||
d6f39728 | 3582 | begin |
177675a7 | 3583 | -- This is an obsolescent feature |
3584 | ||
e0521a36 | 3585 | Check_Restriction (No_Obsolescent_Features, N); |
3586 | ||
9dfe12ae | 3587 | if Warn_On_Obsolescent_Feature then |
3588 | Error_Msg_N | |
b174444e | 3589 | ("?j?at clause is an obsolescent feature (RM J.7(2))", N); |
9dfe12ae | 3590 | Error_Msg_N |
b174444e | 3591 | ("\?j?use address attribute definition clause instead", N); |
9dfe12ae | 3592 | end if; |
3593 | ||
177675a7 | 3594 | -- Rewrite as address clause |
3595 | ||
d6f39728 | 3596 | Rewrite (N, |
3597 | Make_Attribute_Definition_Clause (Sloc (N), | |
935e86e0 | 3598 | Name => Identifier (N), |
3599 | Chars => Name_Address, | |
d6f39728 | 3600 | Expression => Expression (N))); |
177675a7 | 3601 | |
2beb22b1 | 3602 | -- We preserve Comes_From_Source, since logically the clause still comes |
3603 | -- from the source program even though it is changed in form. | |
177675a7 | 3604 | |
3605 | Set_Comes_From_Source (N, CS); | |
3606 | ||
3607 | -- Analyze rewritten clause | |
3608 | ||
d6f39728 | 3609 | Analyze_Attribute_Definition_Clause (N); |
3610 | end Analyze_At_Clause; | |
3611 | ||
3612 | ----------------------------------------- | |
3613 | -- Analyze_Attribute_Definition_Clause -- | |
3614 | ----------------------------------------- | |
3615 | ||
3616 | procedure Analyze_Attribute_Definition_Clause (N : Node_Id) is | |
3617 | Loc : constant Source_Ptr := Sloc (N); | |
3618 | Nam : constant Node_Id := Name (N); | |
3619 | Attr : constant Name_Id := Chars (N); | |
3620 | Expr : constant Node_Id := Expression (N); | |
3621 | Id : constant Attribute_Id := Get_Attribute_Id (Attr); | |
d64221a7 | 3622 | |
3623 | Ent : Entity_Id; | |
3624 | -- The entity of Nam after it is analyzed. In the case of an incomplete | |
3625 | -- type, this is the underlying type. | |
3626 | ||
d6f39728 | 3627 | U_Ent : Entity_Id; |
d64221a7 | 3628 | -- The underlying entity to which the attribute applies. Generally this |
3629 | -- is the Underlying_Type of Ent, except in the case where the clause | |
3630 | -- applies to full view of incomplete type or private type in which case | |
3631 | -- U_Ent is just a copy of Ent. | |
d6f39728 | 3632 | |
3633 | FOnly : Boolean := False; | |
3634 | -- Reset to True for subtype specific attribute (Alignment, Size) | |
51fa2a45 | 3635 | -- and for stream attributes, i.e. those cases where in the call to |
3636 | -- Rep_Item_Too_Late, FOnly is set True so that only the freezing rules | |
3637 | -- are checked. Note that the case of stream attributes is not clear | |
3638 | -- from the RM, but see AI95-00137. Also, the RM seems to disallow | |
3639 | -- Storage_Size for derived task types, but that is also clearly | |
3640 | -- unintentional. | |
d6f39728 | 3641 | |
9f373bb8 | 3642 | procedure Analyze_Stream_TSS_Definition (TSS_Nam : TSS_Name_Type); |
3643 | -- Common processing for 'Read, 'Write, 'Input and 'Output attribute | |
3644 | -- definition clauses. | |
3645 | ||
ae888dbd | 3646 | function Duplicate_Clause return Boolean; |
3647 | -- This routine checks if the aspect for U_Ent being given by attribute | |
3648 | -- definition clause N is for an aspect that has already been specified, | |
3649 | -- and if so gives an error message. If there is a duplicate, True is | |
3650 | -- returned, otherwise if there is no error, False is returned. | |
3651 | ||
81b424ac | 3652 | procedure Check_Indexing_Functions; |
3653 | -- Check that the function in Constant_Indexing or Variable_Indexing | |
3654 | -- attribute has the proper type structure. If the name is overloaded, | |
cac18f71 | 3655 | -- check that some interpretation is legal. |
81b424ac | 3656 | |
89cc7147 | 3657 | procedure Check_Iterator_Functions; |
3658 | -- Check that there is a single function in Default_Iterator attribute | |
8df4f2a5 | 3659 | -- has the proper type structure. |
89cc7147 | 3660 | |
3661 | function Check_Primitive_Function (Subp : Entity_Id) return Boolean; | |
d03bfaa1 | 3662 | -- Common legality check for the previous two |
89cc7147 | 3663 | |
177675a7 | 3664 | ----------------------------------- |
3665 | -- Analyze_Stream_TSS_Definition -- | |
3666 | ----------------------------------- | |
3667 | ||
9f373bb8 | 3668 | procedure Analyze_Stream_TSS_Definition (TSS_Nam : TSS_Name_Type) is |
3669 | Subp : Entity_Id := Empty; | |
3670 | I : Interp_Index; | |
3671 | It : Interp; | |
3672 | Pnam : Entity_Id; | |
3673 | ||
3674 | Is_Read : constant Boolean := (TSS_Nam = TSS_Stream_Read); | |
d64221a7 | 3675 | -- True for Read attribute, false for other attributes |
9f373bb8 | 3676 | |
3677 | function Has_Good_Profile (Subp : Entity_Id) return Boolean; | |
3678 | -- Return true if the entity is a subprogram with an appropriate | |
3679 | -- profile for the attribute being defined. | |
3680 | ||
3681 | ---------------------- | |
3682 | -- Has_Good_Profile -- | |
3683 | ---------------------- | |
3684 | ||
3685 | function Has_Good_Profile (Subp : Entity_Id) return Boolean is | |
3686 | F : Entity_Id; | |
3687 | Is_Function : constant Boolean := (TSS_Nam = TSS_Stream_Input); | |
3688 | Expected_Ekind : constant array (Boolean) of Entity_Kind := | |
3689 | (False => E_Procedure, True => E_Function); | |
3690 | Typ : Entity_Id; | |
3691 | ||
3692 | begin | |
3693 | if Ekind (Subp) /= Expected_Ekind (Is_Function) then | |
3694 | return False; | |
3695 | end if; | |
3696 | ||
3697 | F := First_Formal (Subp); | |
3698 | ||
3699 | if No (F) | |
3700 | or else Ekind (Etype (F)) /= E_Anonymous_Access_Type | |
3701 | or else Designated_Type (Etype (F)) /= | |
3702 | Class_Wide_Type (RTE (RE_Root_Stream_Type)) | |
3703 | then | |
3704 | return False; | |
3705 | end if; | |
3706 | ||
3707 | if not Is_Function then | |
3708 | Next_Formal (F); | |
3709 | ||
3710 | declare | |
3711 | Expected_Mode : constant array (Boolean) of Entity_Kind := | |
3712 | (False => E_In_Parameter, | |
3713 | True => E_Out_Parameter); | |
3714 | begin | |
3715 | if Parameter_Mode (F) /= Expected_Mode (Is_Read) then | |
3716 | return False; | |
3717 | end if; | |
3718 | end; | |
3719 | ||
3720 | Typ := Etype (F); | |
3721 | ||
b64082f2 | 3722 | -- If the attribute specification comes from an aspect |
51fa2a45 | 3723 | -- specification for a class-wide stream, the parameter must be |
3724 | -- a class-wide type of the entity to which the aspect applies. | |
b64082f2 | 3725 | |
3726 | if From_Aspect_Specification (N) | |
3727 | and then Class_Present (Parent (N)) | |
3728 | and then Is_Class_Wide_Type (Typ) | |
3729 | then | |
3730 | Typ := Etype (Typ); | |
3731 | end if; | |
3732 | ||
9f373bb8 | 3733 | else |
3734 | Typ := Etype (Subp); | |
3735 | end if; | |
3736 | ||
51fa2a45 | 3737 | -- Verify that the prefix of the attribute and the local name for |
5a8fe506 | 3738 | -- the type of the formal match, or one is the class-wide of the |
3739 | -- other, in the case of a class-wide stream operation. | |
48680a09 | 3740 | |
5a8fe506 | 3741 | if Base_Type (Typ) = Base_Type (Ent) |
3742 | or else (Is_Class_Wide_Type (Typ) | |
2be1f7d7 | 3743 | and then Typ = Class_Wide_Type (Base_Type (Ent))) |
fbf4d6ef | 3744 | or else (Is_Class_Wide_Type (Ent) |
3745 | and then Ent = Class_Wide_Type (Base_Type (Typ))) | |
5a8fe506 | 3746 | then |
3747 | null; | |
3748 | else | |
3749 | return False; | |
3750 | end if; | |
3751 | ||
3752 | if Present ((Next_Formal (F))) | |
48680a09 | 3753 | then |
3754 | return False; | |
3755 | ||
3756 | elsif not Is_Scalar_Type (Typ) | |
3757 | and then not Is_First_Subtype (Typ) | |
3758 | and then not Is_Class_Wide_Type (Typ) | |
3759 | then | |
3760 | return False; | |
3761 | ||
3762 | else | |
3763 | return True; | |
3764 | end if; | |
9f373bb8 | 3765 | end Has_Good_Profile; |
3766 | ||
3767 | -- Start of processing for Analyze_Stream_TSS_Definition | |
3768 | ||
3769 | begin | |
3770 | FOnly := True; | |
3771 | ||
3772 | if not Is_Type (U_Ent) then | |
3773 | Error_Msg_N ("local name must be a subtype", Nam); | |
3774 | return; | |
48680a09 | 3775 | |
3776 | elsif not Is_First_Subtype (U_Ent) then | |
3777 | Error_Msg_N ("local name must be a first subtype", Nam); | |
3778 | return; | |
9f373bb8 | 3779 | end if; |
3780 | ||
3781 | Pnam := TSS (Base_Type (U_Ent), TSS_Nam); | |
3782 | ||
44e4341e | 3783 | -- If Pnam is present, it can be either inherited from an ancestor |
3784 | -- type (in which case it is legal to redefine it for this type), or | |
3785 | -- be a previous definition of the attribute for the same type (in | |
3786 | -- which case it is illegal). | |
3787 | ||
3788 | -- In the first case, it will have been analyzed already, and we | |
3789 | -- can check that its profile does not match the expected profile | |
3790 | -- for a stream attribute of U_Ent. In the second case, either Pnam | |
3791 | -- has been analyzed (and has the expected profile), or it has not | |
3792 | -- been analyzed yet (case of a type that has not been frozen yet | |
3793 | -- and for which the stream attribute has been set using Set_TSS). | |
3794 | ||
3795 | if Present (Pnam) | |
3796 | and then (No (First_Entity (Pnam)) or else Has_Good_Profile (Pnam)) | |
3797 | then | |
9f373bb8 | 3798 | Error_Msg_Sloc := Sloc (Pnam); |
3799 | Error_Msg_Name_1 := Attr; | |
3800 | Error_Msg_N ("% attribute already defined #", Nam); | |
3801 | return; | |
3802 | end if; | |
3803 | ||
3804 | Analyze (Expr); | |
3805 | ||
3806 | if Is_Entity_Name (Expr) then | |
3807 | if not Is_Overloaded (Expr) then | |
3808 | if Has_Good_Profile (Entity (Expr)) then | |
3809 | Subp := Entity (Expr); | |
3810 | end if; | |
3811 | ||
3812 | else | |
3813 | Get_First_Interp (Expr, I, It); | |
9f373bb8 | 3814 | while Present (It.Nam) loop |
3815 | if Has_Good_Profile (It.Nam) then | |
3816 | Subp := It.Nam; | |
3817 | exit; | |
3818 | end if; | |
3819 | ||
3820 | Get_Next_Interp (I, It); | |
3821 | end loop; | |
3822 | end if; | |
3823 | end if; | |
3824 | ||
3825 | if Present (Subp) then | |
59ac57b5 | 3826 | if Is_Abstract_Subprogram (Subp) then |
9f373bb8 | 3827 | Error_Msg_N ("stream subprogram must not be abstract", Expr); |
3828 | return; | |
e12b2502 | 3829 | |
299b347e | 3830 | -- A stream subprogram for an interface type must be a null |
3831 | -- procedure (RM 13.13.2 (38/3)). | |
e12b2502 | 3832 | |
3833 | elsif Is_Interface (U_Ent) | |
5a8fe506 | 3834 | and then not Is_Class_Wide_Type (U_Ent) |
e12b2502 | 3835 | and then not Inside_A_Generic |
e12b2502 | 3836 | and then |
5a8fe506 | 3837 | (Ekind (Subp) = E_Function |
3838 | or else | |
3839 | not Null_Present | |
2be1f7d7 | 3840 | (Specification |
3841 | (Unit_Declaration_Node (Ultimate_Alias (Subp))))) | |
e12b2502 | 3842 | then |
3843 | Error_Msg_N | |
3844 | ("stream subprogram for interface type " | |
3845 | & "must be null procedure", Expr); | |
9f373bb8 | 3846 | end if; |
3847 | ||
3848 | Set_Entity (Expr, Subp); | |
3849 | Set_Etype (Expr, Etype (Subp)); | |
3850 | ||
44e4341e | 3851 | New_Stream_Subprogram (N, U_Ent, Subp, TSS_Nam); |
9f373bb8 | 3852 | |
3853 | else | |
3854 | Error_Msg_Name_1 := Attr; | |
3855 | Error_Msg_N ("incorrect expression for% attribute", Expr); | |
3856 | end if; | |
3857 | end Analyze_Stream_TSS_Definition; | |
3858 | ||
81b424ac | 3859 | ------------------------------ |
3860 | -- Check_Indexing_Functions -- | |
3861 | ------------------------------ | |
3862 | ||
3863 | procedure Check_Indexing_Functions is | |
c8a2d809 | 3864 | Indexing_Found : Boolean := False; |
8df4f2a5 | 3865 | |
81b424ac | 3866 | procedure Check_One_Function (Subp : Entity_Id); |
7796365f | 3867 | -- Check one possible interpretation. Sets Indexing_Found True if a |
3868 | -- legal indexing function is found. | |
81b424ac | 3869 | |
05987af3 | 3870 | procedure Illegal_Indexing (Msg : String); |
3871 | -- Diagnose illegal indexing function if not overloaded. In the | |
3872 | -- overloaded case indicate that no legal interpretation exists. | |
3873 | ||
81b424ac | 3874 | ------------------------ |
3875 | -- Check_One_Function -- | |
3876 | ------------------------ | |
3877 | ||
3878 | procedure Check_One_Function (Subp : Entity_Id) is | |
05987af3 | 3879 | Default_Element : Node_Id; |
3880 | Ret_Type : constant Entity_Id := Etype (Subp); | |
1b7510f9 | 3881 | |
81b424ac | 3882 | begin |
05987af3 | 3883 | if not Is_Overloadable (Subp) then |
3884 | Illegal_Indexing ("illegal indexing function for type&"); | |
3885 | return; | |
3886 | ||
7796365f | 3887 | elsif Scope (Subp) /= Scope (Ent) then |
3888 | if Nkind (Expr) = N_Expanded_Name then | |
3889 | ||
3890 | -- Indexing function can't be declared elsewhere | |
3891 | ||
3892 | Illegal_Indexing | |
3893 | ("indexing function must be declared in scope of type&"); | |
3894 | end if; | |
3895 | ||
05987af3 | 3896 | return; |
3897 | ||
3898 | elsif No (First_Formal (Subp)) then | |
3899 | Illegal_Indexing | |
3900 | ("Indexing requires a function that applies to type&"); | |
3901 | return; | |
3902 | ||
3903 | elsif No (Next_Formal (First_Formal (Subp))) then | |
3904 | Illegal_Indexing | |
2eb0ff42 | 3905 | ("indexing function must have at least two parameters"); |
05987af3 | 3906 | return; |
3907 | ||
e7d733fc | 3908 | -- For a derived type, check that no indexing aspect is specified |
3909 | -- for the type if it is also inherited | |
22e724e8 | 3910 | |
05987af3 | 3911 | elsif Is_Derived_Type (Ent) then |
2eb0ff42 | 3912 | declare |
3913 | Inherited : Node_Id; | |
05987af3 | 3914 | |
2eb0ff42 | 3915 | begin |
3916 | if Attr = Name_Constant_Indexing then | |
3917 | Inherited := | |
3918 | Find_Aspect (Etype (Ent), Aspect_Constant_Indexing); | |
e7d733fc | 3919 | else pragma Assert (Attr = Name_Variable_Indexing); |
2eb0ff42 | 3920 | Inherited := |
3921 | Find_Aspect (Etype (Ent), Aspect_Variable_Indexing); | |
05987af3 | 3922 | end if; |
2eb0ff42 | 3923 | |
2eb0ff42 | 3924 | if Present (Inherited) then |
3925 | if Debug_Flag_Dot_XX then | |
3926 | null; | |
3927 | ||
e7d733fc | 3928 | -- Indicate the operation that must be overridden, rather |
3929 | -- than redefining the indexing aspect | |
2eb0ff42 | 3930 | |
3931 | else | |
3932 | Illegal_Indexing | |
3933 | ("indexing function already inherited " | |
3934 | & "from parent type"); | |
3935 | Error_Msg_NE | |
e7d733fc | 3936 | ("!override & instead", |
2eb0ff42 | 3937 | N, Entity (Expression (Inherited))); |
3938 | return; | |
3939 | end if; | |
3940 | end if; | |
3941 | end; | |
05987af3 | 3942 | end if; |
3943 | ||
e81df51c | 3944 | if not Check_Primitive_Function (Subp) then |
05987af3 | 3945 | Illegal_Indexing |
3946 | ("Indexing aspect requires a function that applies to type&"); | |
3947 | return; | |
81b424ac | 3948 | end if; |
3949 | ||
7796365f | 3950 | -- If partial declaration exists, verify that it is not tagged. |
3951 | ||
3952 | if Ekind (Current_Scope) = E_Package | |
3953 | and then Has_Private_Declaration (Ent) | |
3954 | and then From_Aspect_Specification (N) | |
7c0c95b8 | 3955 | and then |
3956 | List_Containing (Parent (Ent)) = | |
3957 | Private_Declarations | |
7796365f | 3958 | (Specification (Unit_Declaration_Node (Current_Scope))) |
3959 | and then Nkind (N) = N_Attribute_Definition_Clause | |
3960 | then | |
3961 | declare | |
3962 | Decl : Node_Id; | |
3963 | ||
3964 | begin | |
3965 | Decl := | |
3966 | First (Visible_Declarations | |
7c0c95b8 | 3967 | (Specification |
3968 | (Unit_Declaration_Node (Current_Scope)))); | |
7796365f | 3969 | |
3970 | while Present (Decl) loop | |
3971 | if Nkind (Decl) = N_Private_Type_Declaration | |
3972 | and then Ent = Full_View (Defining_Identifier (Decl)) | |
3973 | and then Tagged_Present (Decl) | |
3974 | and then No (Aspect_Specifications (Decl)) | |
3975 | then | |
3976 | Illegal_Indexing | |
3977 | ("Indexing aspect cannot be specified on full view " | |
7c0c95b8 | 3978 | & "if partial view is tagged"); |
7796365f | 3979 | return; |
3980 | end if; | |
3981 | ||
3982 | Next (Decl); | |
3983 | end loop; | |
3984 | end; | |
3985 | end if; | |
3986 | ||
1b7510f9 | 3987 | -- An indexing function must return either the default element of |
cac18f71 | 3988 | -- the container, or a reference type. For variable indexing it |
a45d946f | 3989 | -- must be the latter. |
1b7510f9 | 3990 | |
05987af3 | 3991 | Default_Element := |
3992 | Find_Value_Of_Aspect | |
3993 | (Etype (First_Formal (Subp)), Aspect_Iterator_Element); | |
3994 | ||
1b7510f9 | 3995 | if Present (Default_Element) then |
3996 | Analyze (Default_Element); | |
a45d946f | 3997 | |
1b7510f9 | 3998 | if Is_Entity_Name (Default_Element) |
05987af3 | 3999 | and then not Covers (Entity (Default_Element), Ret_Type) |
4000 | and then False | |
1b7510f9 | 4001 | then |
05987af3 | 4002 | Illegal_Indexing |
4003 | ("wrong return type for indexing function"); | |
1b7510f9 | 4004 | return; |
4005 | end if; | |
4006 | end if; | |
4007 | ||
a45d946f | 4008 | -- For variable_indexing the return type must be a reference type |
1b7510f9 | 4009 | |
05987af3 | 4010 | if Attr = Name_Variable_Indexing then |
4011 | if not Has_Implicit_Dereference (Ret_Type) then | |
4012 | Illegal_Indexing | |
4013 | ("variable indexing must return a reference type"); | |
4014 | return; | |
4015 | ||
423b89fd | 4016 | elsif Is_Access_Constant |
4017 | (Etype (First_Discriminant (Ret_Type))) | |
05987af3 | 4018 | then |
4019 | Illegal_Indexing | |
4020 | ("variable indexing must return an access to variable"); | |
4021 | return; | |
4022 | end if; | |
cac18f71 | 4023 | |
4024 | else | |
05987af3 | 4025 | if Has_Implicit_Dereference (Ret_Type) |
4026 | and then not | |
4027 | Is_Access_Constant (Etype (First_Discriminant (Ret_Type))) | |
4028 | then | |
4029 | Illegal_Indexing | |
4030 | ("constant indexing must return an access to constant"); | |
4031 | return; | |
4032 | ||
4033 | elsif Is_Access_Type (Etype (First_Formal (Subp))) | |
4034 | and then not Is_Access_Constant (Etype (First_Formal (Subp))) | |
4035 | then | |
4036 | Illegal_Indexing | |
4037 | ("constant indexing must apply to an access to constant"); | |
4038 | return; | |
4039 | end if; | |
81b424ac | 4040 | end if; |
05987af3 | 4041 | |
4042 | -- All checks succeeded. | |
4043 | ||
4044 | Indexing_Found := True; | |
81b424ac | 4045 | end Check_One_Function; |
4046 | ||
05987af3 | 4047 | ----------------------- |
4048 | -- Illegal_Indexing -- | |
4049 | ----------------------- | |
4050 | ||
4051 | procedure Illegal_Indexing (Msg : String) is | |
4052 | begin | |
7796365f | 4053 | Error_Msg_NE (Msg, N, Ent); |
05987af3 | 4054 | end Illegal_Indexing; |
4055 | ||
81b424ac | 4056 | -- Start of processing for Check_Indexing_Functions |
4057 | ||
4058 | begin | |
89cc7147 | 4059 | if In_Instance then |
4060 | return; | |
4061 | end if; | |
4062 | ||
81b424ac | 4063 | Analyze (Expr); |
4064 | ||
4065 | if not Is_Overloaded (Expr) then | |
4066 | Check_One_Function (Entity (Expr)); | |
4067 | ||
4068 | else | |
4069 | declare | |
2c5754de | 4070 | I : Interp_Index; |
81b424ac | 4071 | It : Interp; |
4072 | ||
4073 | begin | |
cac18f71 | 4074 | Indexing_Found := False; |
81b424ac | 4075 | Get_First_Interp (Expr, I, It); |
4076 | while Present (It.Nam) loop | |
4077 | ||
4078 | -- Note that analysis will have added the interpretation | |
4079 | -- that corresponds to the dereference. We only check the | |
4080 | -- subprogram itself. | |
4081 | ||
4082 | if Is_Overloadable (It.Nam) then | |
4083 | Check_One_Function (It.Nam); | |
4084 | end if; | |
4085 | ||
4086 | Get_Next_Interp (I, It); | |
4087 | end loop; | |
4088 | end; | |
4089 | end if; | |
7796365f | 4090 | |
7c0c95b8 | 4091 | if not Indexing_Found and then not Error_Posted (N) then |
7796365f | 4092 | Error_Msg_NE |
4093 | ("aspect Indexing requires a local function that " | |
4094 | & "applies to type&", Expr, Ent); | |
4095 | end if; | |
81b424ac | 4096 | end Check_Indexing_Functions; |
4097 | ||
89cc7147 | 4098 | ------------------------------ |
4099 | -- Check_Iterator_Functions -- | |
4100 | ------------------------------ | |
4101 | ||
4102 | procedure Check_Iterator_Functions is | |
4103 | Default : Entity_Id; | |
4104 | ||
4105 | function Valid_Default_Iterator (Subp : Entity_Id) return Boolean; | |
8df4f2a5 | 4106 | -- Check one possible interpretation for validity |
89cc7147 | 4107 | |
4108 | ---------------------------- | |
4109 | -- Valid_Default_Iterator -- | |
4110 | ---------------------------- | |
4111 | ||
4112 | function Valid_Default_Iterator (Subp : Entity_Id) return Boolean is | |
4113 | Formal : Entity_Id; | |
4114 | ||
4115 | begin | |
4116 | if not Check_Primitive_Function (Subp) then | |
4117 | return False; | |
4118 | else | |
4119 | Formal := First_Formal (Subp); | |
4120 | end if; | |
4121 | ||
8df4f2a5 | 4122 | -- False if any subsequent formal has no default expression |
89cc7147 | 4123 | |
8df4f2a5 | 4124 | Formal := Next_Formal (Formal); |
4125 | while Present (Formal) loop | |
4126 | if No (Expression (Parent (Formal))) then | |
4127 | return False; | |
4128 | end if; | |
89cc7147 | 4129 | |
8df4f2a5 | 4130 | Next_Formal (Formal); |
4131 | end loop; | |
89cc7147 | 4132 | |
8df4f2a5 | 4133 | -- True if all subsequent formals have default expressions |
89cc7147 | 4134 | |
4135 | return True; | |
4136 | end Valid_Default_Iterator; | |
4137 | ||
4138 | -- Start of processing for Check_Iterator_Functions | |
4139 | ||
4140 | begin | |
4141 | Analyze (Expr); | |
4142 | ||
4143 | if not Is_Entity_Name (Expr) then | |
4144 | Error_Msg_N ("aspect Iterator must be a function name", Expr); | |
4145 | end if; | |
4146 | ||
4147 | if not Is_Overloaded (Expr) then | |
4148 | if not Check_Primitive_Function (Entity (Expr)) then | |
4149 | Error_Msg_NE | |
4150 | ("aspect Indexing requires a function that applies to type&", | |
4151 | Entity (Expr), Ent); | |
4152 | end if; | |
4153 | ||
05f6f999 | 4154 | -- Flag the default_iterator as well as the denoted function. |
4155 | ||
89cc7147 | 4156 | if not Valid_Default_Iterator (Entity (Expr)) then |
05f6f999 | 4157 | Error_Msg_N ("improper function for default iterator!", Expr); |
89cc7147 | 4158 | end if; |
4159 | ||
4160 | else | |
4161 | Default := Empty; | |
4162 | declare | |
4163 | I : Interp_Index; | |
4164 | It : Interp; | |
4165 | ||
4166 | begin | |
4167 | Get_First_Interp (Expr, I, It); | |
4168 | while Present (It.Nam) loop | |
4169 | if not Check_Primitive_Function (It.Nam) | |
59f3e675 | 4170 | or else not Valid_Default_Iterator (It.Nam) |
89cc7147 | 4171 | then |
4172 | Remove_Interp (I); | |
4173 | ||
4174 | elsif Present (Default) then | |
4175 | Error_Msg_N ("default iterator must be unique", Expr); | |
4176 | ||
4177 | else | |
4178 | Default := It.Nam; | |
4179 | end if; | |
4180 | ||
4181 | Get_Next_Interp (I, It); | |
4182 | end loop; | |
4183 | end; | |
4184 | ||
4185 | if Present (Default) then | |
4186 | Set_Entity (Expr, Default); | |
4187 | Set_Is_Overloaded (Expr, False); | |
4188 | end if; | |
4189 | end if; | |
4190 | end Check_Iterator_Functions; | |
4191 | ||
4192 | ------------------------------- | |
4193 | -- Check_Primitive_Function -- | |
4194 | ------------------------------- | |
4195 | ||
4196 | function Check_Primitive_Function (Subp : Entity_Id) return Boolean is | |
4197 | Ctrl : Entity_Id; | |
4198 | ||
4199 | begin | |
4200 | if Ekind (Subp) /= E_Function then | |
4201 | return False; | |
4202 | end if; | |
4203 | ||
4204 | if No (First_Formal (Subp)) then | |
4205 | return False; | |
4206 | else | |
4207 | Ctrl := Etype (First_Formal (Subp)); | |
4208 | end if; | |
4209 | ||
05f6f999 | 4210 | -- To be a primitive operation subprogram has to be in same scope. |
4211 | ||
4212 | if Scope (Ctrl) /= Scope (Subp) then | |
4213 | return False; | |
4214 | end if; | |
4215 | ||
7d6fb253 | 4216 | -- Type of formal may be the class-wide type, an access to such, |
4217 | -- or an incomplete view. | |
4218 | ||
89cc7147 | 4219 | if Ctrl = Ent |
4220 | or else Ctrl = Class_Wide_Type (Ent) | |
4221 | or else | |
4222 | (Ekind (Ctrl) = E_Anonymous_Access_Type | |
b85d62ec | 4223 | and then (Designated_Type (Ctrl) = Ent |
4224 | or else | |
4225 | Designated_Type (Ctrl) = Class_Wide_Type (Ent))) | |
7d6fb253 | 4226 | or else |
4227 | (Ekind (Ctrl) = E_Incomplete_Type | |
4228 | and then Full_View (Ctrl) = Ent) | |
89cc7147 | 4229 | then |
4230 | null; | |
89cc7147 | 4231 | else |
4232 | return False; | |
4233 | end if; | |
4234 | ||
4235 | return True; | |
4236 | end Check_Primitive_Function; | |
4237 | ||
ae888dbd | 4238 | ---------------------- |
4239 | -- Duplicate_Clause -- | |
4240 | ---------------------- | |
4241 | ||
4242 | function Duplicate_Clause return Boolean is | |
d74fc39a | 4243 | A : Node_Id; |
ae888dbd | 4244 | |
4245 | begin | |
c8969ba6 | 4246 | -- Nothing to do if this attribute definition clause comes from |
4247 | -- an aspect specification, since we could not be duplicating an | |
ae888dbd | 4248 | -- explicit clause, and we dealt with the case of duplicated aspects |
4249 | -- in Analyze_Aspect_Specifications. | |
4250 | ||
4251 | if From_Aspect_Specification (N) then | |
4252 | return False; | |
4253 | end if; | |
4254 | ||
89f1e35c | 4255 | -- Otherwise current clause may duplicate previous clause, or a |
4256 | -- previously given pragma or aspect specification for the same | |
4257 | -- aspect. | |
d74fc39a | 4258 | |
89b3b365 | 4259 | A := Get_Rep_Item (U_Ent, Chars (N), Check_Parents => False); |
ae888dbd | 4260 | |
4261 | if Present (A) then | |
89f1e35c | 4262 | Error_Msg_Name_1 := Chars (N); |
4263 | Error_Msg_Sloc := Sloc (A); | |
4264 | ||
89b3b365 | 4265 | Error_Msg_NE ("aspect% for & previously given#", N, U_Ent); |
89f1e35c | 4266 | return True; |
ae888dbd | 4267 | end if; |
4268 | ||
4269 | return False; | |
4270 | end Duplicate_Clause; | |
4271 | ||
9f373bb8 | 4272 | -- Start of processing for Analyze_Attribute_Definition_Clause |
4273 | ||
d6f39728 | 4274 | begin |
d64221a7 | 4275 | -- The following code is a defense against recursion. Not clear that |
51fa2a45 | 4276 | -- this can happen legitimately, but perhaps some error situations can |
4277 | -- cause it, and we did see this recursion during testing. | |
d64221a7 | 4278 | |
4279 | if Analyzed (N) then | |
4280 | return; | |
4281 | else | |
4282 | Set_Analyzed (N, True); | |
4283 | end if; | |
4284 | ||
a29bc1d9 | 4285 | -- Ignore some selected attributes in CodePeer mode since they are not |
4286 | -- relevant in this context. | |
4287 | ||
4288 | if CodePeer_Mode then | |
4289 | case Id is | |
4290 | ||
4291 | -- Ignore Component_Size in CodePeer mode, to avoid changing the | |
4292 | -- internal representation of types by implicitly packing them. | |
4293 | ||
4294 | when Attribute_Component_Size => | |
4295 | Rewrite (N, Make_Null_Statement (Sloc (N))); | |
4296 | return; | |
4297 | ||
4298 | when others => | |
4299 | null; | |
4300 | end case; | |
4301 | end if; | |
4302 | ||
d8ba53a8 | 4303 | -- Process Ignore_Rep_Clauses option |
eef1ca1e | 4304 | |
d8ba53a8 | 4305 | if Ignore_Rep_Clauses then |
9d627c41 | 4306 | case Id is |
4307 | ||
eef1ca1e | 4308 | -- The following should be ignored. They do not affect legality |
4309 | -- and may be target dependent. The basic idea of -gnatI is to | |
4310 | -- ignore any rep clauses that may be target dependent but do not | |
4311 | -- affect legality (except possibly to be rejected because they | |
4312 | -- are incompatible with the compilation target). | |
9d627c41 | 4313 | |
2f1aac99 | 4314 | when Attribute_Alignment | |
9d627c41 | 4315 | Attribute_Bit_Order | |
4316 | Attribute_Component_Size | | |
4317 | Attribute_Machine_Radix | | |
4318 | Attribute_Object_Size | | |
4319 | Attribute_Size | | |
2ff55065 | 4320 | Attribute_Small | |
9d627c41 | 4321 | Attribute_Stream_Size | |
4322 | Attribute_Value_Size => | |
2ff55065 | 4323 | Kill_Rep_Clause (N); |
9d627c41 | 4324 | return; |
4325 | ||
eef1ca1e | 4326 | -- The following should not be ignored, because in the first place |
51fa2a45 | 4327 | -- they are reasonably portable, and should not cause problems |
4328 | -- in compiling code from another target, and also they do affect | |
4329 | -- legality, e.g. failing to provide a stream attribute for a type | |
4330 | -- may make a program illegal. | |
9d627c41 | 4331 | |
b55f7641 | 4332 | when Attribute_External_Tag | |
4333 | Attribute_Input | | |
4334 | Attribute_Output | | |
4335 | Attribute_Read | | |
4336 | Attribute_Simple_Storage_Pool | | |
4337 | Attribute_Storage_Pool | | |
4338 | Attribute_Storage_Size | | |
4339 | Attribute_Write => | |
9d627c41 | 4340 | null; |
4341 | ||
2ff55065 | 4342 | -- We do not do anything here with address clauses, they will be |
4343 | -- removed by Freeze later on, but for now, it works better to | |
4344 | -- keep then in the tree. | |
4345 | ||
4346 | when Attribute_Address => | |
4347 | null; | |
4348 | ||
b593a52c | 4349 | -- Other cases are errors ("attribute& cannot be set with |
4350 | -- definition clause"), which will be caught below. | |
9d627c41 | 4351 | |
4352 | when others => | |
4353 | null; | |
4354 | end case; | |
fbc67f84 | 4355 | end if; |
4356 | ||
d6f39728 | 4357 | Analyze (Nam); |
4358 | Ent := Entity (Nam); | |
4359 | ||
4360 | if Rep_Item_Too_Early (Ent, N) then | |
4361 | return; | |
4362 | end if; | |
4363 | ||
9f373bb8 | 4364 | -- Rep clause applies to full view of incomplete type or private type if |
4365 | -- we have one (if not, this is a premature use of the type). However, | |
4366 | -- certain semantic checks need to be done on the specified entity (i.e. | |
4367 | -- the private view), so we save it in Ent. | |
d6f39728 | 4368 | |
4369 | if Is_Private_Type (Ent) | |
4370 | and then Is_Derived_Type (Ent) | |
4371 | and then not Is_Tagged_Type (Ent) | |
4372 | and then No (Full_View (Ent)) | |
4373 | then | |
9f373bb8 | 4374 | -- If this is a private type whose completion is a derivation from |
4375 | -- another private type, there is no full view, and the attribute | |
4376 | -- belongs to the type itself, not its underlying parent. | |
d6f39728 | 4377 | |
4378 | U_Ent := Ent; | |
4379 | ||
4380 | elsif Ekind (Ent) = E_Incomplete_Type then | |
d5b349fa | 4381 | |
9f373bb8 | 4382 | -- The attribute applies to the full view, set the entity of the |
4383 | -- attribute definition accordingly. | |
d5b349fa | 4384 | |
d6f39728 | 4385 | Ent := Underlying_Type (Ent); |
4386 | U_Ent := Ent; | |
d5b349fa | 4387 | Set_Entity (Nam, Ent); |
4388 | ||
d6f39728 | 4389 | else |
4390 | U_Ent := Underlying_Type (Ent); | |
4391 | end if; | |
4392 | ||
44705307 | 4393 | -- Avoid cascaded error |
d6f39728 | 4394 | |
4395 | if Etype (Nam) = Any_Type then | |
4396 | return; | |
4397 | ||
89f1e35c | 4398 | -- Must be declared in current scope or in case of an aspect |
ace3389d | 4399 | -- specification, must be visible in current scope. |
44705307 | 4400 | |
89f1e35c | 4401 | elsif Scope (Ent) /= Current_Scope |
ace3389d | 4402 | and then |
4403 | not (From_Aspect_Specification (N) | |
4404 | and then Scope_Within_Or_Same (Current_Scope, Scope (Ent))) | |
89f1e35c | 4405 | then |
d6f39728 | 4406 | Error_Msg_N ("entity must be declared in this scope", Nam); |
4407 | return; | |
4408 | ||
44705307 | 4409 | -- Must not be a source renaming (we do have some cases where the |
4410 | -- expander generates a renaming, and those cases are OK, in such | |
a3248fc4 | 4411 | -- cases any attribute applies to the renamed object as well). |
44705307 | 4412 | |
4413 | elsif Is_Object (Ent) | |
4414 | and then Present (Renamed_Object (Ent)) | |
44705307 | 4415 | then |
a3248fc4 | 4416 | -- Case of renamed object from source, this is an error |
4417 | ||
4418 | if Comes_From_Source (Renamed_Object (Ent)) then | |
4419 | Get_Name_String (Chars (N)); | |
4420 | Error_Msg_Strlen := Name_Len; | |
4421 | Error_Msg_String (1 .. Name_Len) := Name_Buffer (1 .. Name_Len); | |
4422 | Error_Msg_N | |
4423 | ("~ clause not allowed for a renaming declaration " | |
4424 | & "(RM 13.1(6))", Nam); | |
4425 | return; | |
4426 | ||
4427 | -- For the case of a compiler generated renaming, the attribute | |
4428 | -- definition clause applies to the renamed object created by the | |
4429 | -- expander. The easiest general way to handle this is to create a | |
4430 | -- copy of the attribute definition clause for this object. | |
4431 | ||
9a48fc56 | 4432 | elsif Is_Entity_Name (Renamed_Object (Ent)) then |
a3248fc4 | 4433 | Insert_Action (N, |
4434 | Make_Attribute_Definition_Clause (Loc, | |
4435 | Name => | |
4436 | New_Occurrence_Of (Entity (Renamed_Object (Ent)), Loc), | |
4437 | Chars => Chars (N), | |
4438 | Expression => Duplicate_Subexpr (Expression (N)))); | |
9a48fc56 | 4439 | |
4440 | -- If the renamed object is not an entity, it must be a dereference | |
4441 | -- of an unconstrained function call, and we must introduce a new | |
4442 | -- declaration to capture the expression. This is needed in the case | |
4443 | -- of 'Alignment, where the original declaration must be rewritten. | |
4444 | ||
4445 | else | |
4446 | pragma Assert | |
4447 | (Nkind (Renamed_Object (Ent)) = N_Explicit_Dereference); | |
4448 | null; | |
a3248fc4 | 4449 | end if; |
44705307 | 4450 | |
4451 | -- If no underlying entity, use entity itself, applies to some | |
4452 | -- previously detected error cases ??? | |
4453 | ||
f15731c4 | 4454 | elsif No (U_Ent) then |
4455 | U_Ent := Ent; | |
4456 | ||
44705307 | 4457 | -- Cannot specify for a subtype (exception Object/Value_Size) |
4458 | ||
d6f39728 | 4459 | elsif Is_Type (U_Ent) |
4460 | and then not Is_First_Subtype (U_Ent) | |
4461 | and then Id /= Attribute_Object_Size | |
4462 | and then Id /= Attribute_Value_Size | |
4463 | and then not From_At_Mod (N) | |
4464 | then | |
4465 | Error_Msg_N ("cannot specify attribute for subtype", Nam); | |
4466 | return; | |
d6f39728 | 4467 | end if; |
4468 | ||
ae888dbd | 4469 | Set_Entity (N, U_Ent); |
25e23a77 | 4470 | Check_Restriction_No_Use_Of_Attribute (N); |
ae888dbd | 4471 | |
d6f39728 | 4472 | -- Switch on particular attribute |
4473 | ||
4474 | case Id is | |
4475 | ||
4476 | ------------- | |
4477 | -- Address -- | |
4478 | ------------- | |
4479 | ||
4480 | -- Address attribute definition clause | |
4481 | ||
4482 | when Attribute_Address => Address : begin | |
177675a7 | 4483 | |
4484 | -- A little error check, catch for X'Address use X'Address; | |
4485 | ||
4486 | if Nkind (Nam) = N_Identifier | |
4487 | and then Nkind (Expr) = N_Attribute_Reference | |
4488 | and then Attribute_Name (Expr) = Name_Address | |
4489 | and then Nkind (Prefix (Expr)) = N_Identifier | |
4490 | and then Chars (Nam) = Chars (Prefix (Expr)) | |
4491 | then | |
4492 | Error_Msg_NE | |
4493 | ("address for & is self-referencing", Prefix (Expr), Ent); | |
4494 | return; | |
4495 | end if; | |
4496 | ||
4497 | -- Not that special case, carry on with analysis of expression | |
4498 | ||
d6f39728 | 4499 | Analyze_And_Resolve (Expr, RTE (RE_Address)); |
4500 | ||
2f1aac99 | 4501 | -- Even when ignoring rep clauses we need to indicate that the |
4502 | -- entity has an address clause and thus it is legal to declare | |
2ff55065 | 4503 | -- it imported. Freeze will get rid of the address clause later. |
2f1aac99 | 4504 | |
4505 | if Ignore_Rep_Clauses then | |
d3ef794c | 4506 | if Ekind_In (U_Ent, E_Variable, E_Constant) then |
2f1aac99 | 4507 | Record_Rep_Item (U_Ent, N); |
4508 | end if; | |
4509 | ||
4510 | return; | |
4511 | end if; | |
4512 | ||
ae888dbd | 4513 | if Duplicate_Clause then |
4514 | null; | |
d6f39728 | 4515 | |
4516 | -- Case of address clause for subprogram | |
4517 | ||
4518 | elsif Is_Subprogram (U_Ent) then | |
d6f39728 | 4519 | if Has_Homonym (U_Ent) then |
4520 | Error_Msg_N | |
4521 | ("address clause cannot be given " & | |
4522 | "for overloaded subprogram", | |
4523 | Nam); | |
83f8f0a6 | 4524 | return; |
d6f39728 | 4525 | end if; |
4526 | ||
83f8f0a6 | 4527 | -- For subprograms, all address clauses are permitted, and we |
4528 | -- mark the subprogram as having a deferred freeze so that Gigi | |
4529 | -- will not elaborate it too soon. | |
d6f39728 | 4530 | |
4531 | -- Above needs more comments, what is too soon about??? | |
4532 | ||
4533 | Set_Has_Delayed_Freeze (U_Ent); | |
4534 | ||
4535 | -- Case of address clause for entry | |
4536 | ||
4537 | elsif Ekind (U_Ent) = E_Entry then | |
d6f39728 | 4538 | if Nkind (Parent (N)) = N_Task_Body then |
4539 | Error_Msg_N | |
4540 | ("entry address must be specified in task spec", Nam); | |
83f8f0a6 | 4541 | return; |
d6f39728 | 4542 | end if; |
4543 | ||
4544 | -- For entries, we require a constant address | |
4545 | ||
4546 | Check_Constant_Address_Clause (Expr, U_Ent); | |
4547 | ||
83f8f0a6 | 4548 | -- Special checks for task types |
4549 | ||
f15731c4 | 4550 | if Is_Task_Type (Scope (U_Ent)) |
4551 | and then Comes_From_Source (Scope (U_Ent)) | |
4552 | then | |
4553 | Error_Msg_N | |
1e3532e7 | 4554 | ("??entry address declared for entry in task type", N); |
f15731c4 | 4555 | Error_Msg_N |
1e3532e7 | 4556 | ("\??only one task can be declared of this type", N); |
f15731c4 | 4557 | end if; |
4558 | ||
83f8f0a6 | 4559 | -- Entry address clauses are obsolescent |
4560 | ||
e0521a36 | 4561 | Check_Restriction (No_Obsolescent_Features, N); |
4562 | ||
9dfe12ae | 4563 | if Warn_On_Obsolescent_Feature then |
4564 | Error_Msg_N | |
1e3532e7 | 4565 | ("?j?attaching interrupt to task entry is an " & |
4566 | "obsolescent feature (RM J.7.1)", N); | |
9dfe12ae | 4567 | Error_Msg_N |
1e3532e7 | 4568 | ("\?j?use interrupt procedure instead", N); |
9dfe12ae | 4569 | end if; |
4570 | ||
83f8f0a6 | 4571 | -- Case of an address clause for a controlled object which we |
4572 | -- consider to be erroneous. | |
9dfe12ae | 4573 | |
83f8f0a6 | 4574 | elsif Is_Controlled (Etype (U_Ent)) |
4575 | or else Has_Controlled_Component (Etype (U_Ent)) | |
4576 | then | |
9dfe12ae | 4577 | Error_Msg_NE |
1e3532e7 | 4578 | ("??controlled object& must not be overlaid", Nam, U_Ent); |
9dfe12ae | 4579 | Error_Msg_N |
1e3532e7 | 4580 | ("\??Program_Error will be raised at run time", Nam); |
9dfe12ae | 4581 | Insert_Action (Declaration_Node (U_Ent), |
4582 | Make_Raise_Program_Error (Loc, | |
4583 | Reason => PE_Overlaid_Controlled_Object)); | |
83f8f0a6 | 4584 | return; |
9dfe12ae | 4585 | |
4586 | -- Case of address clause for a (non-controlled) object | |
d6f39728 | 4587 | |
f02a9a9a | 4588 | elsif Ekind_In (U_Ent, E_Variable, E_Constant) then |
d6f39728 | 4589 | declare |
d6da7448 | 4590 | Expr : constant Node_Id := Expression (N); |
4591 | O_Ent : Entity_Id; | |
4592 | Off : Boolean; | |
d6f39728 | 4593 | |
4594 | begin | |
7ee315cc | 4595 | -- Exported variables cannot have an address clause, because |
4596 | -- this cancels the effect of the pragma Export. | |
d6f39728 | 4597 | |
4598 | if Is_Exported (U_Ent) then | |
4599 | Error_Msg_N | |
4600 | ("cannot export object with address clause", Nam); | |
83f8f0a6 | 4601 | return; |
d6da7448 | 4602 | end if; |
4603 | ||
4604 | Find_Overlaid_Entity (N, O_Ent, Off); | |
d6f39728 | 4605 | |
9dfe12ae | 4606 | -- Overlaying controlled objects is erroneous |
4607 | ||
d6da7448 | 4608 | if Present (O_Ent) |
4609 | and then (Has_Controlled_Component (Etype (O_Ent)) | |
f02a9a9a | 4610 | or else Is_Controlled (Etype (O_Ent))) |
9dfe12ae | 4611 | then |
4612 | Error_Msg_N | |
1e3532e7 | 4613 | ("??cannot overlay with controlled object", Expr); |
9dfe12ae | 4614 | Error_Msg_N |
1e3532e7 | 4615 | ("\??Program_Error will be raised at run time", Expr); |
9dfe12ae | 4616 | Insert_Action (Declaration_Node (U_Ent), |
4617 | Make_Raise_Program_Error (Loc, | |
4618 | Reason => PE_Overlaid_Controlled_Object)); | |
83f8f0a6 | 4619 | return; |
9dfe12ae | 4620 | |
d6da7448 | 4621 | elsif Present (O_Ent) |
9dfe12ae | 4622 | and then Ekind (U_Ent) = E_Constant |
d6da7448 | 4623 | and then not Is_Constant_Object (O_Ent) |
9dfe12ae | 4624 | then |
1e3532e7 | 4625 | Error_Msg_N ("??constant overlays a variable", Expr); |
9dfe12ae | 4626 | |
d6f39728 | 4627 | -- Imported variables can have an address clause, but then |
4628 | -- the import is pretty meaningless except to suppress | |
4629 | -- initializations, so we do not need such variables to | |
4630 | -- be statically allocated (and in fact it causes trouble | |
4631 | -- if the address clause is a local value). | |
4632 | ||
4633 | elsif Is_Imported (U_Ent) then | |
4634 | Set_Is_Statically_Allocated (U_Ent, False); | |
4635 | end if; | |
4636 | ||
4637 | -- We mark a possible modification of a variable with an | |
4638 | -- address clause, since it is likely aliasing is occurring. | |
4639 | ||
177675a7 | 4640 | Note_Possible_Modification (Nam, Sure => False); |
d6f39728 | 4641 | |
83f8f0a6 | 4642 | -- Here we are checking for explicit overlap of one variable |
4643 | -- by another, and if we find this then mark the overlapped | |
4644 | -- variable as also being volatile to prevent unwanted | |
d6da7448 | 4645 | -- optimizations. This is a significant pessimization so |
4646 | -- avoid it when there is an offset, i.e. when the object | |
4647 | -- is composite; they cannot be optimized easily anyway. | |
d6f39728 | 4648 | |
d6da7448 | 4649 | if Present (O_Ent) |
4650 | and then Is_Object (O_Ent) | |
4651 | and then not Off | |
ba5efa21 | 4652 | |
4653 | -- The following test is an expedient solution to what | |
4654 | -- is really a problem in CodePeer. Suppressing the | |
4655 | -- Set_Treat_As_Volatile call here prevents later | |
4656 | -- generation (in some cases) of trees that CodePeer | |
4657 | -- should, but currently does not, handle correctly. | |
4658 | -- This test should probably be removed when CodePeer | |
4659 | -- is improved, just because we want the tree CodePeer | |
4660 | -- analyzes to match the tree for which we generate code | |
4661 | -- as closely as is practical. ??? | |
4662 | ||
4663 | and then not CodePeer_Mode | |
d6da7448 | 4664 | then |
ba5efa21 | 4665 | -- ??? O_Ent might not be in current unit |
4666 | ||
d6da7448 | 4667 | Set_Treat_As_Volatile (O_Ent); |
d6f39728 | 4668 | end if; |
4669 | ||
9dfe12ae | 4670 | -- Legality checks on the address clause for initialized |
4671 | -- objects is deferred until the freeze point, because | |
2beb22b1 | 4672 | -- a subsequent pragma might indicate that the object |
42e09e36 | 4673 | -- is imported and thus not initialized. Also, the address |
4674 | -- clause might involve entities that have yet to be | |
4675 | -- elaborated. | |
9dfe12ae | 4676 | |
4677 | Set_Has_Delayed_Freeze (U_Ent); | |
4678 | ||
51ad5ad2 | 4679 | -- If an initialization call has been generated for this |
4680 | -- object, it needs to be deferred to after the freeze node | |
4681 | -- we have just now added, otherwise GIGI will see a | |
4682 | -- reference to the variable (as actual to the IP call) | |
4683 | -- before its definition. | |
4684 | ||
4685 | declare | |
df9fba45 | 4686 | Init_Call : constant Node_Id := |
4687 | Remove_Init_Call (U_Ent, N); | |
4bba0a8d | 4688 | |
51ad5ad2 | 4689 | begin |
4690 | if Present (Init_Call) then | |
28a4283c | 4691 | Append_Freeze_Action (U_Ent, Init_Call); |
df9fba45 | 4692 | |
28a4283c | 4693 | -- Reset Initialization_Statements pointer so that |
4694 | -- if there is a pragma Import further down, it can | |
4695 | -- clear any default initialization. | |
df9fba45 | 4696 | |
28a4283c | 4697 | Set_Initialization_Statements (U_Ent, Init_Call); |
51ad5ad2 | 4698 | end if; |
4699 | end; | |
4700 | ||
d6f39728 | 4701 | if Is_Exported (U_Ent) then |
4702 | Error_Msg_N | |
4703 | ("& cannot be exported if an address clause is given", | |
4704 | Nam); | |
4705 | Error_Msg_N | |
4bba0a8d | 4706 | ("\define and export a variable " |
4707 | & "that holds its address instead", Nam); | |
d6f39728 | 4708 | end if; |
4709 | ||
44e4341e | 4710 | -- Entity has delayed freeze, so we will generate an |
4711 | -- alignment check at the freeze point unless suppressed. | |
d6f39728 | 4712 | |
44e4341e | 4713 | if not Range_Checks_Suppressed (U_Ent) |
4714 | and then not Alignment_Checks_Suppressed (U_Ent) | |
4715 | then | |
4716 | Set_Check_Address_Alignment (N); | |
4717 | end if; | |
d6f39728 | 4718 | |
4719 | -- Kill the size check code, since we are not allocating | |
4720 | -- the variable, it is somewhere else. | |
4721 | ||
4722 | Kill_Size_Check_Code (U_Ent); | |
83f8f0a6 | 4723 | |
d6da7448 | 4724 | -- If the address clause is of the form: |
83f8f0a6 | 4725 | |
d6da7448 | 4726 | -- for Y'Address use X'Address |
83f8f0a6 | 4727 | |
d6da7448 | 4728 | -- or |
83f8f0a6 | 4729 | |
d6da7448 | 4730 | -- Const : constant Address := X'Address; |
4731 | -- ... | |
4732 | -- for Y'Address use Const; | |
83f8f0a6 | 4733 | |
d6da7448 | 4734 | -- then we make an entry in the table for checking the size |
4735 | -- and alignment of the overlaying variable. We defer this | |
4736 | -- check till after code generation to take full advantage | |
f4623c89 | 4737 | -- of the annotation done by the back end. |
d64221a7 | 4738 | |
9474aa9c | 4739 | -- If the entity has a generic type, the check will be |
43dd6937 | 4740 | -- performed in the instance if the actual type justifies |
4741 | -- it, and we do not insert the clause in the table to | |
4742 | -- prevent spurious warnings. | |
83f8f0a6 | 4743 | |
f4623c89 | 4744 | -- Note: we used to test Comes_From_Source and only give |
4745 | -- this warning for source entities, but we have removed | |
4746 | -- this test. It really seems bogus to generate overlays | |
4747 | -- that would trigger this warning in generated code. | |
4748 | -- Furthermore, by removing the test, we handle the | |
4749 | -- aspect case properly. | |
4750 | ||
d6da7448 | 4751 | if Address_Clause_Overlay_Warnings |
d6da7448 | 4752 | and then Present (O_Ent) |
4753 | and then Is_Object (O_Ent) | |
4754 | then | |
9474aa9c | 4755 | if not Is_Generic_Type (Etype (U_Ent)) then |
4756 | Address_Clause_Checks.Append ((N, U_Ent, O_Ent, Off)); | |
4757 | end if; | |
177675a7 | 4758 | |
d6da7448 | 4759 | -- If variable overlays a constant view, and we are |
4760 | -- warning on overlays, then mark the variable as | |
4761 | -- overlaying a constant (we will give warnings later | |
4762 | -- if this variable is assigned). | |
177675a7 | 4763 | |
d6da7448 | 4764 | if Is_Constant_Object (O_Ent) |
4765 | and then Ekind (U_Ent) = E_Variable | |
4766 | then | |
4767 | Set_Overlays_Constant (U_Ent); | |
83f8f0a6 | 4768 | end if; |
d6da7448 | 4769 | end if; |
4770 | end; | |
83f8f0a6 | 4771 | |
d6f39728 | 4772 | -- Not a valid entity for an address clause |
4773 | ||
4774 | else | |
4775 | Error_Msg_N ("address cannot be given for &", Nam); | |
4776 | end if; | |
4777 | end Address; | |
4778 | ||
4779 | --------------- | |
4780 | -- Alignment -- | |
4781 | --------------- | |
4782 | ||
4783 | -- Alignment attribute definition clause | |
4784 | ||
b47769f0 | 4785 | when Attribute_Alignment => Alignment : declare |
208fd589 | 4786 | Align : constant Uint := Get_Alignment_Value (Expr); |
4787 | Max_Align : constant Uint := UI_From_Int (Maximum_Alignment); | |
41331dcf | 4788 | |
d6f39728 | 4789 | begin |
4790 | FOnly := True; | |
4791 | ||
4792 | if not Is_Type (U_Ent) | |
4793 | and then Ekind (U_Ent) /= E_Variable | |
4794 | and then Ekind (U_Ent) /= E_Constant | |
4795 | then | |
4796 | Error_Msg_N ("alignment cannot be given for &", Nam); | |
4797 | ||
ae888dbd | 4798 | elsif Duplicate_Clause then |
4799 | null; | |
d6f39728 | 4800 | |
4801 | elsif Align /= No_Uint then | |
4802 | Set_Has_Alignment_Clause (U_Ent); | |
208fd589 | 4803 | |
44705307 | 4804 | -- Tagged type case, check for attempt to set alignment to a |
4805 | -- value greater than Max_Align, and reset if so. | |
4806 | ||
41331dcf | 4807 | if Is_Tagged_Type (U_Ent) and then Align > Max_Align then |
208fd589 | 4808 | Error_Msg_N |
1e3532e7 | 4809 | ("alignment for & set to Maximum_Aligment??", Nam); |
44705307 | 4810 | Set_Alignment (U_Ent, Max_Align); |
4811 | ||
4812 | -- All other cases | |
4813 | ||
208fd589 | 4814 | else |
4815 | Set_Alignment (U_Ent, Align); | |
4816 | end if; | |
b47769f0 | 4817 | |
4818 | -- For an array type, U_Ent is the first subtype. In that case, | |
4819 | -- also set the alignment of the anonymous base type so that | |
4820 | -- other subtypes (such as the itypes for aggregates of the | |
4821 | -- type) also receive the expected alignment. | |
4822 | ||
4823 | if Is_Array_Type (U_Ent) then | |
4824 | Set_Alignment (Base_Type (U_Ent), Align); | |
4825 | end if; | |
d6f39728 | 4826 | end if; |
b47769f0 | 4827 | end Alignment; |
d6f39728 | 4828 | |
4829 | --------------- | |
4830 | -- Bit_Order -- | |
4831 | --------------- | |
4832 | ||
4833 | -- Bit_Order attribute definition clause | |
4834 | ||
4835 | when Attribute_Bit_Order => Bit_Order : declare | |
4836 | begin | |
4837 | if not Is_Record_Type (U_Ent) then | |
4838 | Error_Msg_N | |
4839 | ("Bit_Order can only be defined for record type", Nam); | |
4840 | ||
ae888dbd | 4841 | elsif Duplicate_Clause then |
4842 | null; | |
4843 | ||
d6f39728 | 4844 | else |
4845 | Analyze_And_Resolve (Expr, RTE (RE_Bit_Order)); | |
4846 | ||
4847 | if Etype (Expr) = Any_Type then | |
4848 | return; | |
4849 | ||
cda40848 | 4850 | elsif not Is_OK_Static_Expression (Expr) then |
9dfe12ae | 4851 | Flag_Non_Static_Expr |
4852 | ("Bit_Order requires static expression!", Expr); | |
d6f39728 | 4853 | |
4854 | else | |
4855 | if (Expr_Value (Expr) = 0) /= Bytes_Big_Endian then | |
fae4ea1f | 4856 | Set_Reverse_Bit_Order (Base_Type (U_Ent), True); |
d6f39728 | 4857 | end if; |
4858 | end if; | |
4859 | end if; | |
4860 | end Bit_Order; | |
4861 | ||
4862 | -------------------- | |
4863 | -- Component_Size -- | |
4864 | -------------------- | |
4865 | ||
4866 | -- Component_Size attribute definition clause | |
4867 | ||
4868 | when Attribute_Component_Size => Component_Size_Case : declare | |
4869 | Csize : constant Uint := Static_Integer (Expr); | |
a0fc8c5b | 4870 | Ctyp : Entity_Id; |
d6f39728 | 4871 | Btype : Entity_Id; |
4872 | Biased : Boolean; | |
4873 | New_Ctyp : Entity_Id; | |
4874 | Decl : Node_Id; | |
4875 | ||
4876 | begin | |
4877 | if not Is_Array_Type (U_Ent) then | |
4878 | Error_Msg_N ("component size requires array type", Nam); | |
4879 | return; | |
4880 | end if; | |
4881 | ||
4882 | Btype := Base_Type (U_Ent); | |
a0fc8c5b | 4883 | Ctyp := Component_Type (Btype); |
d6f39728 | 4884 | |
ae888dbd | 4885 | if Duplicate_Clause then |
4886 | null; | |
d6f39728 | 4887 | |
f3e4db96 | 4888 | elsif Rep_Item_Too_Early (Btype, N) then |
4889 | null; | |
4890 | ||
d6f39728 | 4891 | elsif Csize /= No_Uint then |
a0fc8c5b | 4892 | Check_Size (Expr, Ctyp, Csize, Biased); |
d6f39728 | 4893 | |
d74fc39a | 4894 | -- For the biased case, build a declaration for a subtype that |
4895 | -- will be used to represent the biased subtype that reflects | |
4896 | -- the biased representation of components. We need the subtype | |
4897 | -- to get proper conversions on referencing elements of the | |
4898 | -- array. Note: component size clauses are ignored in VM mode. | |
3062c401 | 4899 | |
4900 | if VM_Target = No_VM then | |
4901 | if Biased then | |
4902 | New_Ctyp := | |
4903 | Make_Defining_Identifier (Loc, | |
4904 | Chars => | |
4905 | New_External_Name (Chars (U_Ent), 'C', 0, 'T')); | |
4906 | ||
4907 | Decl := | |
4908 | Make_Subtype_Declaration (Loc, | |
4909 | Defining_Identifier => New_Ctyp, | |
4910 | Subtype_Indication => | |
4911 | New_Occurrence_Of (Component_Type (Btype), Loc)); | |
4912 | ||
4913 | Set_Parent (Decl, N); | |
4914 | Analyze (Decl, Suppress => All_Checks); | |
4915 | ||
4916 | Set_Has_Delayed_Freeze (New_Ctyp, False); | |
4917 | Set_Esize (New_Ctyp, Csize); | |
4918 | Set_RM_Size (New_Ctyp, Csize); | |
4919 | Init_Alignment (New_Ctyp); | |
3062c401 | 4920 | Set_Is_Itype (New_Ctyp, True); |
4921 | Set_Associated_Node_For_Itype (New_Ctyp, U_Ent); | |
4922 | ||
4923 | Set_Component_Type (Btype, New_Ctyp); | |
b77e4501 | 4924 | Set_Biased (New_Ctyp, N, "component size clause"); |
3062c401 | 4925 | end if; |
4926 | ||
4927 | Set_Component_Size (Btype, Csize); | |
4928 | ||
4929 | -- For VM case, we ignore component size clauses | |
4930 | ||
4931 | else | |
4932 | -- Give a warning unless we are in GNAT mode, in which case | |
4933 | -- the warning is suppressed since it is not useful. | |
4934 | ||
4935 | if not GNAT_Mode then | |
4936 | Error_Msg_N | |
1e3532e7 | 4937 | ("component size ignored in this configuration??", N); |
3062c401 | 4938 | end if; |
d6f39728 | 4939 | end if; |
4940 | ||
a0fc8c5b | 4941 | -- Deal with warning on overridden size |
4942 | ||
4943 | if Warn_On_Overridden_Size | |
4944 | and then Has_Size_Clause (Ctyp) | |
4945 | and then RM_Size (Ctyp) /= Csize | |
4946 | then | |
4947 | Error_Msg_NE | |
1e3532e7 | 4948 | ("component size overrides size clause for&?S?", N, Ctyp); |
a0fc8c5b | 4949 | end if; |
4950 | ||
d6f39728 | 4951 | Set_Has_Component_Size_Clause (Btype, True); |
f3e4db96 | 4952 | Set_Has_Non_Standard_Rep (Btype, True); |
d6f39728 | 4953 | end if; |
4954 | end Component_Size_Case; | |
4955 | ||
81b424ac | 4956 | ----------------------- |
4957 | -- Constant_Indexing -- | |
4958 | ----------------------- | |
4959 | ||
4960 | when Attribute_Constant_Indexing => | |
4961 | Check_Indexing_Functions; | |
4962 | ||
89f1e35c | 4963 | --------- |
4964 | -- CPU -- | |
4965 | --------- | |
4966 | ||
4967 | when Attribute_CPU => CPU : | |
4968 | begin | |
4969 | -- CPU attribute definition clause not allowed except from aspect | |
4970 | -- specification. | |
4971 | ||
4972 | if From_Aspect_Specification (N) then | |
4973 | if not Is_Task_Type (U_Ent) then | |
4974 | Error_Msg_N ("CPU can only be defined for task", Nam); | |
4975 | ||
4976 | elsif Duplicate_Clause then | |
4977 | null; | |
4978 | ||
4979 | else | |
4980 | -- The expression must be analyzed in the special manner | |
4981 | -- described in "Handling of Default and Per-Object | |
4982 | -- Expressions" in sem.ads. | |
4983 | ||
4984 | -- The visibility to the discriminants must be restored | |
4985 | ||
4986 | Push_Scope_And_Install_Discriminants (U_Ent); | |
4987 | Preanalyze_Spec_Expression (Expr, RTE (RE_CPU_Range)); | |
4988 | Uninstall_Discriminants_And_Pop_Scope (U_Ent); | |
4989 | ||
cda40848 | 4990 | if not Is_OK_Static_Expression (Expr) then |
89f1e35c | 4991 | Check_Restriction (Static_Priorities, Expr); |
4992 | end if; | |
4993 | end if; | |
4994 | ||
4995 | else | |
4996 | Error_Msg_N | |
4997 | ("attribute& cannot be set with definition clause", N); | |
4998 | end if; | |
4999 | end CPU; | |
5000 | ||
89cc7147 | 5001 | ---------------------- |
5002 | -- Default_Iterator -- | |
5003 | ---------------------- | |
5004 | ||
5005 | when Attribute_Default_Iterator => Default_Iterator : declare | |
5006 | Func : Entity_Id; | |
fbf4d6ef | 5007 | Typ : Entity_Id; |
89cc7147 | 5008 | |
5009 | begin | |
05f6f999 | 5010 | -- If target type is untagged, further checks are irrelevant |
5011 | ||
89cc7147 | 5012 | if not Is_Tagged_Type (U_Ent) then |
5013 | Error_Msg_N | |
05f6f999 | 5014 | ("aspect Default_Iterator applies to tagged type", Nam); |
5015 | return; | |
89cc7147 | 5016 | end if; |
5017 | ||
5018 | Check_Iterator_Functions; | |
5019 | ||
5020 | Analyze (Expr); | |
5021 | ||
5022 | if not Is_Entity_Name (Expr) | |
5023 | or else Ekind (Entity (Expr)) /= E_Function | |
5024 | then | |
5025 | Error_Msg_N ("aspect Iterator must be a function", Expr); | |
05f6f999 | 5026 | return; |
89cc7147 | 5027 | else |
5028 | Func := Entity (Expr); | |
5029 | end if; | |
5030 | ||
fbf4d6ef | 5031 | -- The type of the first parameter must be T, T'class, or a |
05f6f999 | 5032 | -- corresponding access type (5.5.1 (8/3). If function is |
5033 | -- parameterless label type accordingly. | |
fbf4d6ef | 5034 | |
5035 | if No (First_Formal (Func)) then | |
05f6f999 | 5036 | Typ := Any_Type; |
fbf4d6ef | 5037 | else |
5038 | Typ := Etype (First_Formal (Func)); | |
5039 | end if; | |
5040 | ||
5041 | if Typ = U_Ent | |
5042 | or else Typ = Class_Wide_Type (U_Ent) | |
5043 | or else (Is_Access_Type (Typ) | |
5044 | and then Designated_Type (Typ) = U_Ent) | |
5045 | or else (Is_Access_Type (Typ) | |
5046 | and then Designated_Type (Typ) = | |
5047 | Class_Wide_Type (U_Ent)) | |
89cc7147 | 5048 | then |
fbf4d6ef | 5049 | null; |
5050 | ||
5051 | else | |
89cc7147 | 5052 | Error_Msg_NE |
5053 | ("Default Iterator must be a primitive of&", Func, U_Ent); | |
5054 | end if; | |
5055 | end Default_Iterator; | |
5056 | ||
89f1e35c | 5057 | ------------------------ |
5058 | -- Dispatching_Domain -- | |
5059 | ------------------------ | |
5060 | ||
5061 | when Attribute_Dispatching_Domain => Dispatching_Domain : | |
5062 | begin | |
5063 | -- Dispatching_Domain attribute definition clause not allowed | |
5064 | -- except from aspect specification. | |
5065 | ||
5066 | if From_Aspect_Specification (N) then | |
5067 | if not Is_Task_Type (U_Ent) then | |
fbf4d6ef | 5068 | Error_Msg_N |
5069 | ("Dispatching_Domain can only be defined for task", Nam); | |
89f1e35c | 5070 | |
5071 | elsif Duplicate_Clause then | |
5072 | null; | |
5073 | ||
5074 | else | |
5075 | -- The expression must be analyzed in the special manner | |
5076 | -- described in "Handling of Default and Per-Object | |
5077 | -- Expressions" in sem.ads. | |
5078 | ||
5079 | -- The visibility to the discriminants must be restored | |
5080 | ||
5081 | Push_Scope_And_Install_Discriminants (U_Ent); | |
5082 | ||
5083 | Preanalyze_Spec_Expression | |
5084 | (Expr, RTE (RE_Dispatching_Domain)); | |
5085 | ||
5086 | Uninstall_Discriminants_And_Pop_Scope (U_Ent); | |
5087 | end if; | |
5088 | ||
5089 | else | |
5090 | Error_Msg_N | |
5091 | ("attribute& cannot be set with definition clause", N); | |
5092 | end if; | |
5093 | end Dispatching_Domain; | |
5094 | ||
d6f39728 | 5095 | ------------------ |
5096 | -- External_Tag -- | |
5097 | ------------------ | |
5098 | ||
5099 | when Attribute_External_Tag => External_Tag : | |
5100 | begin | |
5101 | if not Is_Tagged_Type (U_Ent) then | |
5102 | Error_Msg_N ("should be a tagged type", Nam); | |
5103 | end if; | |
5104 | ||
ae888dbd | 5105 | if Duplicate_Clause then |
5106 | null; | |
d6f39728 | 5107 | |
9af0ddc7 | 5108 | else |
ae888dbd | 5109 | Analyze_And_Resolve (Expr, Standard_String); |
fbc67f84 | 5110 | |
cda40848 | 5111 | if not Is_OK_Static_Expression (Expr) then |
ae888dbd | 5112 | Flag_Non_Static_Expr |
5113 | ("static string required for tag name!", Nam); | |
5114 | end if; | |
5115 | ||
15a67a0a | 5116 | if VM_Target /= No_VM then |
ae888dbd | 5117 | Error_Msg_Name_1 := Attr; |
5118 | Error_Msg_N | |
5119 | ("% attribute unsupported in this configuration", Nam); | |
5120 | end if; | |
5121 | ||
5122 | if not Is_Library_Level_Entity (U_Ent) then | |
5123 | Error_Msg_NE | |
1e3532e7 | 5124 | ("??non-unique external tag supplied for &", N, U_Ent); |
ae888dbd | 5125 | Error_Msg_N |
1e3532e7 | 5126 | ("\??same external tag applies to all " |
5127 | & "subprogram calls", N); | |
ae888dbd | 5128 | Error_Msg_N |
1e3532e7 | 5129 | ("\??corresponding internal tag cannot be obtained", N); |
ae888dbd | 5130 | end if; |
fbc67f84 | 5131 | end if; |
d6f39728 | 5132 | end External_Tag; |
5133 | ||
b57530b8 | 5134 | -------------------------- |
5135 | -- Implicit_Dereference -- | |
5136 | -------------------------- | |
7947a439 | 5137 | |
b57530b8 | 5138 | when Attribute_Implicit_Dereference => |
7947a439 | 5139 | |
2beb22b1 | 5140 | -- Legality checks already performed at the point of the type |
5141 | -- declaration, aspect is not delayed. | |
7947a439 | 5142 | |
89cc7147 | 5143 | null; |
b57530b8 | 5144 | |
d6f39728 | 5145 | ----------- |
5146 | -- Input -- | |
5147 | ----------- | |
5148 | ||
9f373bb8 | 5149 | when Attribute_Input => |
5150 | Analyze_Stream_TSS_Definition (TSS_Stream_Input); | |
5151 | Set_Has_Specified_Stream_Input (Ent); | |
d6f39728 | 5152 | |
89f1e35c | 5153 | ------------------------ |
5154 | -- Interrupt_Priority -- | |
5155 | ------------------------ | |
5156 | ||
5157 | when Attribute_Interrupt_Priority => Interrupt_Priority : | |
5158 | begin | |
5159 | -- Interrupt_Priority attribute definition clause not allowed | |
5160 | -- except from aspect specification. | |
5161 | ||
5162 | if From_Aspect_Specification (N) then | |
f02a9a9a | 5163 | if not Is_Concurrent_Type (U_Ent) then |
89f1e35c | 5164 | Error_Msg_N |
f02a9a9a | 5165 | ("Interrupt_Priority can only be defined for task " |
5166 | & "and protected object", Nam); | |
89f1e35c | 5167 | |
5168 | elsif Duplicate_Clause then | |
5169 | null; | |
5170 | ||
5171 | else | |
5172 | -- The expression must be analyzed in the special manner | |
5173 | -- described in "Handling of Default and Per-Object | |
5174 | -- Expressions" in sem.ads. | |
5175 | ||
5176 | -- The visibility to the discriminants must be restored | |
5177 | ||
5178 | Push_Scope_And_Install_Discriminants (U_Ent); | |
5179 | ||
5180 | Preanalyze_Spec_Expression | |
5181 | (Expr, RTE (RE_Interrupt_Priority)); | |
5182 | ||
5183 | Uninstall_Discriminants_And_Pop_Scope (U_Ent); | |
5184 | end if; | |
5185 | ||
5186 | else | |
5187 | Error_Msg_N | |
5188 | ("attribute& cannot be set with definition clause", N); | |
5189 | end if; | |
5190 | end Interrupt_Priority; | |
5191 | ||
b3f8228a | 5192 | -------------- |
5193 | -- Iterable -- | |
5194 | -------------- | |
5195 | ||
5196 | when Attribute_Iterable => | |
5197 | Analyze (Expr); | |
bde03454 | 5198 | |
b3f8228a | 5199 | if Nkind (Expr) /= N_Aggregate then |
5200 | Error_Msg_N ("aspect Iterable must be an aggregate", Expr); | |
5201 | end if; | |
5202 | ||
5203 | declare | |
5204 | Assoc : Node_Id; | |
5205 | ||
5206 | begin | |
5207 | Assoc := First (Component_Associations (Expr)); | |
5208 | while Present (Assoc) loop | |
5209 | if not Is_Entity_Name (Expression (Assoc)) then | |
5210 | Error_Msg_N ("value must be a function", Assoc); | |
5211 | end if; | |
bde03454 | 5212 | |
b3f8228a | 5213 | Next (Assoc); |
5214 | end loop; | |
5215 | end; | |
5216 | ||
89cc7147 | 5217 | ---------------------- |
5218 | -- Iterator_Element -- | |
5219 | ---------------------- | |
5220 | ||
5221 | when Attribute_Iterator_Element => | |
5222 | Analyze (Expr); | |
5223 | ||
5224 | if not Is_Entity_Name (Expr) | |
5225 | or else not Is_Type (Entity (Expr)) | |
5226 | then | |
5227 | Error_Msg_N ("aspect Iterator_Element must be a type", Expr); | |
5228 | end if; | |
5229 | ||
d6f39728 | 5230 | ------------------- |
5231 | -- Machine_Radix -- | |
5232 | ------------------- | |
5233 | ||
5234 | -- Machine radix attribute definition clause | |
5235 | ||
5236 | when Attribute_Machine_Radix => Machine_Radix : declare | |
5237 | Radix : constant Uint := Static_Integer (Expr); | |
5238 | ||
5239 | begin | |
5240 | if not Is_Decimal_Fixed_Point_Type (U_Ent) then | |
5241 | Error_Msg_N ("decimal fixed-point type expected for &", Nam); | |
5242 | ||
ae888dbd | 5243 | elsif Duplicate_Clause then |
5244 | null; | |
d6f39728 | 5245 | |
5246 | elsif Radix /= No_Uint then | |
5247 | Set_Has_Machine_Radix_Clause (U_Ent); | |
5248 | Set_Has_Non_Standard_Rep (Base_Type (U_Ent)); | |
5249 | ||
5250 | if Radix = 2 then | |
5251 | null; | |
5252 | elsif Radix = 10 then | |
5253 | Set_Machine_Radix_10 (U_Ent); | |
5254 | else | |
5255 | Error_Msg_N ("machine radix value must be 2 or 10", Expr); | |
5256 | end if; | |
5257 | end if; | |
5258 | end Machine_Radix; | |
5259 | ||
5260 | ----------------- | |
5261 | -- Object_Size -- | |
5262 | ----------------- | |
5263 | ||
5264 | -- Object_Size attribute definition clause | |
5265 | ||
5266 | when Attribute_Object_Size => Object_Size : declare | |
bfa5a9d9 | 5267 | Size : constant Uint := Static_Integer (Expr); |
5268 | ||
d6f39728 | 5269 | Biased : Boolean; |
bfa5a9d9 | 5270 | pragma Warnings (Off, Biased); |
d6f39728 | 5271 | |
5272 | begin | |
5273 | if not Is_Type (U_Ent) then | |
5274 | Error_Msg_N ("Object_Size cannot be given for &", Nam); | |
5275 | ||
ae888dbd | 5276 | elsif Duplicate_Clause then |
5277 | null; | |
d6f39728 | 5278 | |
5279 | else | |
5280 | Check_Size (Expr, U_Ent, Size, Biased); | |
5281 | ||
829cd457 | 5282 | if Is_Scalar_Type (U_Ent) then |
5283 | if Size /= 8 and then Size /= 16 and then Size /= 32 | |
5284 | and then UI_Mod (Size, 64) /= 0 | |
5285 | then | |
5286 | Error_Msg_N | |
5287 | ("Object_Size must be 8, 16, 32, or multiple of 64", | |
5288 | Expr); | |
5289 | end if; | |
5290 | ||
5291 | elsif Size mod 8 /= 0 then | |
5292 | Error_Msg_N ("Object_Size must be a multiple of 8", Expr); | |
d6f39728 | 5293 | end if; |
5294 | ||
5295 | Set_Esize (U_Ent, Size); | |
5296 | Set_Has_Object_Size_Clause (U_Ent); | |
1d366b32 | 5297 | Alignment_Check_For_Size_Change (U_Ent, Size); |
d6f39728 | 5298 | end if; |
5299 | end Object_Size; | |
5300 | ||
5301 | ------------ | |
5302 | -- Output -- | |
5303 | ------------ | |
5304 | ||
9f373bb8 | 5305 | when Attribute_Output => |
5306 | Analyze_Stream_TSS_Definition (TSS_Stream_Output); | |
5307 | Set_Has_Specified_Stream_Output (Ent); | |
d6f39728 | 5308 | |
89f1e35c | 5309 | -------------- |
5310 | -- Priority -- | |
5311 | -------------- | |
5312 | ||
5313 | when Attribute_Priority => Priority : | |
5314 | begin | |
5315 | -- Priority attribute definition clause not allowed except from | |
5316 | -- aspect specification. | |
5317 | ||
5318 | if From_Aspect_Specification (N) then | |
f02a9a9a | 5319 | if not (Is_Concurrent_Type (U_Ent) |
3a72f9c3 | 5320 | or else Ekind (U_Ent) = E_Procedure) |
89f1e35c | 5321 | then |
5322 | Error_Msg_N | |
f02a9a9a | 5323 | ("Priority can only be defined for task and protected " |
5324 | & "object", Nam); | |
89f1e35c | 5325 | |
5326 | elsif Duplicate_Clause then | |
5327 | null; | |
5328 | ||
5329 | else | |
5330 | -- The expression must be analyzed in the special manner | |
5331 | -- described in "Handling of Default and Per-Object | |
5332 | -- Expressions" in sem.ads. | |
5333 | ||
5334 | -- The visibility to the discriminants must be restored | |
5335 | ||
5336 | Push_Scope_And_Install_Discriminants (U_Ent); | |
5337 | Preanalyze_Spec_Expression (Expr, Standard_Integer); | |
5338 | Uninstall_Discriminants_And_Pop_Scope (U_Ent); | |
5339 | ||
cda40848 | 5340 | if not Is_OK_Static_Expression (Expr) then |
89f1e35c | 5341 | Check_Restriction (Static_Priorities, Expr); |
5342 | end if; | |
5343 | end if; | |
5344 | ||
5345 | else | |
5346 | Error_Msg_N | |
5347 | ("attribute& cannot be set with definition clause", N); | |
5348 | end if; | |
5349 | end Priority; | |
5350 | ||
d6f39728 | 5351 | ---------- |
5352 | -- Read -- | |
5353 | ---------- | |
5354 | ||
9f373bb8 | 5355 | when Attribute_Read => |
5356 | Analyze_Stream_TSS_Definition (TSS_Stream_Read); | |
5357 | Set_Has_Specified_Stream_Read (Ent); | |
d6f39728 | 5358 | |
b7b74740 | 5359 | -------------------------- |
5360 | -- Scalar_Storage_Order -- | |
5361 | -------------------------- | |
5362 | ||
5363 | -- Scalar_Storage_Order attribute definition clause | |
5364 | ||
5365 | when Attribute_Scalar_Storage_Order => Scalar_Storage_Order : declare | |
5366 | begin | |
b43a5770 | 5367 | if not (Is_Record_Type (U_Ent) or else Is_Array_Type (U_Ent)) then |
b7b74740 | 5368 | Error_Msg_N |
b43a5770 | 5369 | ("Scalar_Storage_Order can only be defined for " |
5370 | & "record or array type", Nam); | |
b7b74740 | 5371 | |
5372 | elsif Duplicate_Clause then | |
5373 | null; | |
5374 | ||
5375 | else | |
5376 | Analyze_And_Resolve (Expr, RTE (RE_Bit_Order)); | |
5377 | ||
5378 | if Etype (Expr) = Any_Type then | |
5379 | return; | |
5380 | ||
cda40848 | 5381 | elsif not Is_OK_Static_Expression (Expr) then |
b7b74740 | 5382 | Flag_Non_Static_Expr |
5383 | ("Scalar_Storage_Order requires static expression!", Expr); | |
5384 | ||
c0912570 | 5385 | elsif (Expr_Value (Expr) = 0) /= Bytes_Big_Endian then |
5386 | ||
5387 | -- Here for the case of a non-default (i.e. non-confirming) | |
5388 | -- Scalar_Storage_Order attribute definition. | |
5389 | ||
5390 | if Support_Nondefault_SSO_On_Target then | |
d0a9ea3b | 5391 | Set_Reverse_Storage_Order (Base_Type (U_Ent), True); |
c0912570 | 5392 | else |
5393 | Error_Msg_N | |
5394 | ("non-default Scalar_Storage_Order " | |
5395 | & "not supported on target", Expr); | |
b7b74740 | 5396 | end if; |
5397 | end if; | |
b64082f2 | 5398 | |
5399 | -- Clear SSO default indications since explicit setting of the | |
5400 | -- order overrides the defaults. | |
5401 | ||
5402 | Set_SSO_Set_Low_By_Default (Base_Type (U_Ent), False); | |
5403 | Set_SSO_Set_High_By_Default (Base_Type (U_Ent), False); | |
b7b74740 | 5404 | end if; |
5405 | end Scalar_Storage_Order; | |
5406 | ||
d6f39728 | 5407 | ---------- |
5408 | -- Size -- | |
5409 | ---------- | |
5410 | ||
5411 | -- Size attribute definition clause | |
5412 | ||
5413 | when Attribute_Size => Size : declare | |
5414 | Size : constant Uint := Static_Integer (Expr); | |
5415 | Etyp : Entity_Id; | |
5416 | Biased : Boolean; | |
5417 | ||
5418 | begin | |
5419 | FOnly := True; | |
5420 | ||
ae888dbd | 5421 | if Duplicate_Clause then |
5422 | null; | |
d6f39728 | 5423 | |
5424 | elsif not Is_Type (U_Ent) | |
5425 | and then Ekind (U_Ent) /= E_Variable | |
5426 | and then Ekind (U_Ent) /= E_Constant | |
5427 | then | |
5428 | Error_Msg_N ("size cannot be given for &", Nam); | |
5429 | ||
5430 | elsif Is_Array_Type (U_Ent) | |
5431 | and then not Is_Constrained (U_Ent) | |
5432 | then | |
5433 | Error_Msg_N | |
5434 | ("size cannot be given for unconstrained array", Nam); | |
5435 | ||
c2b89d6e | 5436 | elsif Size /= No_Uint then |
c2b89d6e | 5437 | if VM_Target /= No_VM and then not GNAT_Mode then |
47495553 | 5438 | |
c2b89d6e | 5439 | -- Size clause is not handled properly on VM targets. |
5440 | -- Display a warning unless we are in GNAT mode, in which | |
5441 | -- case this is useless. | |
47495553 | 5442 | |
682fa897 | 5443 | Error_Msg_N |
1e3532e7 | 5444 | ("size clauses are ignored in this configuration??", N); |
682fa897 | 5445 | end if; |
5446 | ||
d6f39728 | 5447 | if Is_Type (U_Ent) then |
5448 | Etyp := U_Ent; | |
5449 | else | |
5450 | Etyp := Etype (U_Ent); | |
5451 | end if; | |
5452 | ||
59ac57b5 | 5453 | -- Check size, note that Gigi is in charge of checking that the |
5454 | -- size of an array or record type is OK. Also we do not check | |
5455 | -- the size in the ordinary fixed-point case, since it is too | |
5456 | -- early to do so (there may be subsequent small clause that | |
5457 | -- affects the size). We can check the size if a small clause | |
5458 | -- has already been given. | |
d6f39728 | 5459 | |
5460 | if not Is_Ordinary_Fixed_Point_Type (U_Ent) | |
5461 | or else Has_Small_Clause (U_Ent) | |
5462 | then | |
5463 | Check_Size (Expr, Etyp, Size, Biased); | |
b77e4501 | 5464 | Set_Biased (U_Ent, N, "size clause", Biased); |
d6f39728 | 5465 | end if; |
5466 | ||
5467 | -- For types set RM_Size and Esize if possible | |
5468 | ||
5469 | if Is_Type (U_Ent) then | |
5470 | Set_RM_Size (U_Ent, Size); | |
5471 | ||
ada34def | 5472 | -- For elementary types, increase Object_Size to power of 2, |
5473 | -- but not less than a storage unit in any case (normally | |
59ac57b5 | 5474 | -- this means it will be byte addressable). |
d6f39728 | 5475 | |
ada34def | 5476 | -- For all other types, nothing else to do, we leave Esize |
5477 | -- (object size) unset, the back end will set it from the | |
5478 | -- size and alignment in an appropriate manner. | |
5479 | ||
1d366b32 | 5480 | -- In both cases, we check whether the alignment must be |
5481 | -- reset in the wake of the size change. | |
5482 | ||
ada34def | 5483 | if Is_Elementary_Type (U_Ent) then |
f15731c4 | 5484 | if Size <= System_Storage_Unit then |
5485 | Init_Esize (U_Ent, System_Storage_Unit); | |
d6f39728 | 5486 | elsif Size <= 16 then |
5487 | Init_Esize (U_Ent, 16); | |
5488 | elsif Size <= 32 then | |
5489 | Init_Esize (U_Ent, 32); | |
5490 | else | |
5491 | Set_Esize (U_Ent, (Size + 63) / 64 * 64); | |
5492 | end if; | |
5493 | ||
1d366b32 | 5494 | Alignment_Check_For_Size_Change (U_Ent, Esize (U_Ent)); |
5495 | else | |
5496 | Alignment_Check_For_Size_Change (U_Ent, Size); | |
d6f39728 | 5497 | end if; |
5498 | ||
d6f39728 | 5499 | -- For objects, set Esize only |
5500 | ||
5501 | else | |
9dfe12ae | 5502 | if Is_Elementary_Type (Etyp) then |
5503 | if Size /= System_Storage_Unit | |
5504 | and then | |
5505 | Size /= System_Storage_Unit * 2 | |
5506 | and then | |
5507 | Size /= System_Storage_Unit * 4 | |
5508 | and then | |
5509 | Size /= System_Storage_Unit * 8 | |
5510 | then | |
5c99c290 | 5511 | Error_Msg_Uint_1 := UI_From_Int (System_Storage_Unit); |
87d5c1d0 | 5512 | Error_Msg_Uint_2 := Error_Msg_Uint_1 * 8; |
9dfe12ae | 5513 | Error_Msg_N |
5c99c290 | 5514 | ("size for primitive object must be a power of 2" |
87d5c1d0 | 5515 | & " in the range ^-^", N); |
9dfe12ae | 5516 | end if; |
5517 | end if; | |
5518 | ||
d6f39728 | 5519 | Set_Esize (U_Ent, Size); |
5520 | end if; | |
5521 | ||
5522 | Set_Has_Size_Clause (U_Ent); | |
5523 | end if; | |
5524 | end Size; | |
5525 | ||
5526 | ----------- | |
5527 | -- Small -- | |
5528 | ----------- | |
5529 | ||
5530 | -- Small attribute definition clause | |
5531 | ||
5532 | when Attribute_Small => Small : declare | |
5533 | Implicit_Base : constant Entity_Id := Base_Type (U_Ent); | |
5534 | Small : Ureal; | |
5535 | ||
5536 | begin | |
5537 | Analyze_And_Resolve (Expr, Any_Real); | |
5538 | ||
5539 | if Etype (Expr) = Any_Type then | |
5540 | return; | |
5541 | ||
cda40848 | 5542 | elsif not Is_OK_Static_Expression (Expr) then |
9dfe12ae | 5543 | Flag_Non_Static_Expr |
5544 | ("small requires static expression!", Expr); | |
d6f39728 | 5545 | return; |
5546 | ||
5547 | else | |
5548 | Small := Expr_Value_R (Expr); | |
5549 | ||
5550 | if Small <= Ureal_0 then | |
5551 | Error_Msg_N ("small value must be greater than zero", Expr); | |
5552 | return; | |
5553 | end if; | |
5554 | ||
5555 | end if; | |
5556 | ||
5557 | if not Is_Ordinary_Fixed_Point_Type (U_Ent) then | |
5558 | Error_Msg_N | |
5559 | ("small requires an ordinary fixed point type", Nam); | |
5560 | ||
5561 | elsif Has_Small_Clause (U_Ent) then | |
5562 | Error_Msg_N ("small already given for &", Nam); | |
5563 | ||
5564 | elsif Small > Delta_Value (U_Ent) then | |
5565 | Error_Msg_N | |
ce3e25d6 | 5566 | ("small value must not be greater than delta value", Nam); |
d6f39728 | 5567 | |
5568 | else | |
5569 | Set_Small_Value (U_Ent, Small); | |
5570 | Set_Small_Value (Implicit_Base, Small); | |
5571 | Set_Has_Small_Clause (U_Ent); | |
5572 | Set_Has_Small_Clause (Implicit_Base); | |
5573 | Set_Has_Non_Standard_Rep (Implicit_Base); | |
5574 | end if; | |
5575 | end Small; | |
5576 | ||
d6f39728 | 5577 | ------------------ |
5578 | -- Storage_Pool -- | |
5579 | ------------------ | |
5580 | ||
5581 | -- Storage_Pool attribute definition clause | |
5582 | ||
b55f7641 | 5583 | when Attribute_Storage_Pool | Attribute_Simple_Storage_Pool => declare |
d6f39728 | 5584 | Pool : Entity_Id; |
6b567c71 | 5585 | T : Entity_Id; |
d6f39728 | 5586 | |
5587 | begin | |
44e4341e | 5588 | if Ekind (U_Ent) = E_Access_Subprogram_Type then |
5589 | Error_Msg_N | |
5590 | ("storage pool cannot be given for access-to-subprogram type", | |
5591 | Nam); | |
5592 | return; | |
5593 | ||
d3ef794c | 5594 | elsif not |
5595 | Ekind_In (U_Ent, E_Access_Type, E_General_Access_Type) | |
d6f39728 | 5596 | then |
44e4341e | 5597 | Error_Msg_N |
5598 | ("storage pool can only be given for access types", Nam); | |
d6f39728 | 5599 | return; |
5600 | ||
5601 | elsif Is_Derived_Type (U_Ent) then | |
5602 | Error_Msg_N | |
5603 | ("storage pool cannot be given for a derived access type", | |
5604 | Nam); | |
5605 | ||
ae888dbd | 5606 | elsif Duplicate_Clause then |
d6f39728 | 5607 | return; |
5608 | ||
5609 | elsif Present (Associated_Storage_Pool (U_Ent)) then | |
5610 | Error_Msg_N ("storage pool already given for &", Nam); | |
5611 | return; | |
5612 | end if; | |
5613 | ||
6653b695 | 5614 | -- Check for Storage_Size previously given |
5615 | ||
5616 | declare | |
5617 | SS : constant Node_Id := | |
5618 | Get_Attribute_Definition_Clause | |
5619 | (U_Ent, Attribute_Storage_Size); | |
5620 | begin | |
5621 | if Present (SS) then | |
5622 | Check_Pool_Size_Clash (U_Ent, N, SS); | |
5623 | end if; | |
5624 | end; | |
5625 | ||
5626 | -- Storage_Pool case | |
5627 | ||
b55f7641 | 5628 | if Id = Attribute_Storage_Pool then |
5629 | Analyze_And_Resolve | |
5630 | (Expr, Class_Wide_Type (RTE (RE_Root_Storage_Pool))); | |
5631 | ||
5632 | -- In the Simple_Storage_Pool case, we allow a variable of any | |
b15003c3 | 5633 | -- simple storage pool type, so we Resolve without imposing an |
b55f7641 | 5634 | -- expected type. |
5635 | ||
5636 | else | |
5637 | Analyze_And_Resolve (Expr); | |
5638 | ||
5639 | if not Present (Get_Rep_Pragma | |
b15003c3 | 5640 | (Etype (Expr), Name_Simple_Storage_Pool_Type)) |
b55f7641 | 5641 | then |
5642 | Error_Msg_N | |
5643 | ("expression must be of a simple storage pool type", Expr); | |
5644 | end if; | |
5645 | end if; | |
d6f39728 | 5646 | |
8c5c7277 | 5647 | if not Denotes_Variable (Expr) then |
5648 | Error_Msg_N ("storage pool must be a variable", Expr); | |
5649 | return; | |
5650 | end if; | |
5651 | ||
6b567c71 | 5652 | if Nkind (Expr) = N_Type_Conversion then |
5653 | T := Etype (Expression (Expr)); | |
5654 | else | |
5655 | T := Etype (Expr); | |
5656 | end if; | |
5657 | ||
5658 | -- The Stack_Bounded_Pool is used internally for implementing | |
d64221a7 | 5659 | -- access types with a Storage_Size. Since it only work properly |
5660 | -- when used on one specific type, we need to check that it is not | |
5661 | -- hijacked improperly: | |
5662 | ||
6b567c71 | 5663 | -- type T is access Integer; |
5664 | -- for T'Storage_Size use n; | |
5665 | -- type Q is access Float; | |
5666 | -- for Q'Storage_Size use T'Storage_Size; -- incorrect | |
5667 | ||
15ebb600 | 5668 | if RTE_Available (RE_Stack_Bounded_Pool) |
5669 | and then Base_Type (T) = RTE (RE_Stack_Bounded_Pool) | |
5670 | then | |
5671 | Error_Msg_N ("non-shareable internal Pool", Expr); | |
6b567c71 | 5672 | return; |
5673 | end if; | |
5674 | ||
d6f39728 | 5675 | -- If the argument is a name that is not an entity name, then |
5676 | -- we construct a renaming operation to define an entity of | |
5677 | -- type storage pool. | |
5678 | ||
5679 | if not Is_Entity_Name (Expr) | |
5680 | and then Is_Object_Reference (Expr) | |
5681 | then | |
11deeeb6 | 5682 | Pool := Make_Temporary (Loc, 'P', Expr); |
d6f39728 | 5683 | |
5684 | declare | |
5685 | Rnode : constant Node_Id := | |
5686 | Make_Object_Renaming_Declaration (Loc, | |
5687 | Defining_Identifier => Pool, | |
5688 | Subtype_Mark => | |
5689 | New_Occurrence_Of (Etype (Expr), Loc), | |
11deeeb6 | 5690 | Name => Expr); |
d6f39728 | 5691 | |
5692 | begin | |
f65f7fdf | 5693 | -- If the attribute definition clause comes from an aspect |
5694 | -- clause, then insert the renaming before the associated | |
5695 | -- entity's declaration, since the attribute clause has | |
5696 | -- not yet been appended to the declaration list. | |
5697 | ||
5698 | if From_Aspect_Specification (N) then | |
5699 | Insert_Before (Parent (Entity (N)), Rnode); | |
5700 | else | |
5701 | Insert_Before (N, Rnode); | |
5702 | end if; | |
5703 | ||
d6f39728 | 5704 | Analyze (Rnode); |
5705 | Set_Associated_Storage_Pool (U_Ent, Pool); | |
5706 | end; | |
5707 | ||
5708 | elsif Is_Entity_Name (Expr) then | |
5709 | Pool := Entity (Expr); | |
5710 | ||
5711 | -- If pool is a renamed object, get original one. This can | |
5712 | -- happen with an explicit renaming, and within instances. | |
5713 | ||
5714 | while Present (Renamed_Object (Pool)) | |
5715 | and then Is_Entity_Name (Renamed_Object (Pool)) | |
5716 | loop | |
5717 | Pool := Entity (Renamed_Object (Pool)); | |
5718 | end loop; | |
5719 | ||
5720 | if Present (Renamed_Object (Pool)) | |
5721 | and then Nkind (Renamed_Object (Pool)) = N_Type_Conversion | |
5722 | and then Is_Entity_Name (Expression (Renamed_Object (Pool))) | |
5723 | then | |
5724 | Pool := Entity (Expression (Renamed_Object (Pool))); | |
5725 | end if; | |
5726 | ||
6b567c71 | 5727 | Set_Associated_Storage_Pool (U_Ent, Pool); |
d6f39728 | 5728 | |
5729 | elsif Nkind (Expr) = N_Type_Conversion | |
5730 | and then Is_Entity_Name (Expression (Expr)) | |
5731 | and then Nkind (Original_Node (Expr)) = N_Attribute_Reference | |
5732 | then | |
5733 | Pool := Entity (Expression (Expr)); | |
6b567c71 | 5734 | Set_Associated_Storage_Pool (U_Ent, Pool); |
d6f39728 | 5735 | |
5736 | else | |
5737 | Error_Msg_N ("incorrect reference to a Storage Pool", Expr); | |
5738 | return; | |
5739 | end if; | |
b55f7641 | 5740 | end; |
d6f39728 | 5741 | |
44e4341e | 5742 | ------------------ |
5743 | -- Storage_Size -- | |
5744 | ------------------ | |
5745 | ||
5746 | -- Storage_Size attribute definition clause | |
5747 | ||
5748 | when Attribute_Storage_Size => Storage_Size : declare | |
5749 | Btype : constant Entity_Id := Base_Type (U_Ent); | |
44e4341e | 5750 | |
5751 | begin | |
5752 | if Is_Task_Type (U_Ent) then | |
44e4341e | 5753 | |
39a0c1d3 | 5754 | -- Check obsolescent (but never obsolescent if from aspect) |
ceec4f7c | 5755 | |
5756 | if not From_Aspect_Specification (N) then | |
5757 | Check_Restriction (No_Obsolescent_Features, N); | |
5758 | ||
5759 | if Warn_On_Obsolescent_Feature then | |
5760 | Error_Msg_N | |
5761 | ("?j?storage size clause for task is an " & | |
5762 | "obsolescent feature (RM J.9)", N); | |
5763 | Error_Msg_N ("\?j?use Storage_Size pragma instead", N); | |
5764 | end if; | |
44e4341e | 5765 | end if; |
5766 | ||
5767 | FOnly := True; | |
5768 | end if; | |
5769 | ||
5770 | if not Is_Access_Type (U_Ent) | |
5771 | and then Ekind (U_Ent) /= E_Task_Type | |
5772 | then | |
5773 | Error_Msg_N ("storage size cannot be given for &", Nam); | |
5774 | ||
5775 | elsif Is_Access_Type (U_Ent) and Is_Derived_Type (U_Ent) then | |
5776 | Error_Msg_N | |
5777 | ("storage size cannot be given for a derived access type", | |
5778 | Nam); | |
5779 | ||
ae888dbd | 5780 | elsif Duplicate_Clause then |
5781 | null; | |
44e4341e | 5782 | |
5783 | else | |
5784 | Analyze_And_Resolve (Expr, Any_Integer); | |
5785 | ||
5786 | if Is_Access_Type (U_Ent) then | |
6653b695 | 5787 | |
5788 | -- Check for Storage_Pool previously given | |
5789 | ||
5790 | declare | |
5791 | SP : constant Node_Id := | |
5792 | Get_Attribute_Definition_Clause | |
5793 | (U_Ent, Attribute_Storage_Pool); | |
5794 | ||
5795 | begin | |
5796 | if Present (SP) then | |
5797 | Check_Pool_Size_Clash (U_Ent, SP, N); | |
5798 | end if; | |
5799 | end; | |
5800 | ||
5801 | -- Special case of for x'Storage_Size use 0 | |
44e4341e | 5802 | |
5941a4e9 | 5803 | if Is_OK_Static_Expression (Expr) |
44e4341e | 5804 | and then Expr_Value (Expr) = 0 |
5805 | then | |
5806 | Set_No_Pool_Assigned (Btype); | |
5807 | end if; | |
44e4341e | 5808 | end if; |
5809 | ||
5810 | Set_Has_Storage_Size_Clause (Btype); | |
5811 | end if; | |
5812 | end Storage_Size; | |
5813 | ||
7189d17f | 5814 | ----------------- |
5815 | -- Stream_Size -- | |
5816 | ----------------- | |
5817 | ||
5818 | when Attribute_Stream_Size => Stream_Size : declare | |
5819 | Size : constant Uint := Static_Integer (Expr); | |
5820 | ||
5821 | begin | |
15ebb600 | 5822 | if Ada_Version <= Ada_95 then |
5823 | Check_Restriction (No_Implementation_Attributes, N); | |
5824 | end if; | |
5825 | ||
ae888dbd | 5826 | if Duplicate_Clause then |
5827 | null; | |
7189d17f | 5828 | |
5829 | elsif Is_Elementary_Type (U_Ent) then | |
5830 | if Size /= System_Storage_Unit | |
5831 | and then | |
5832 | Size /= System_Storage_Unit * 2 | |
5833 | and then | |
5834 | Size /= System_Storage_Unit * 4 | |
5835 | and then | |
5836 | Size /= System_Storage_Unit * 8 | |
5837 | then | |
5838 | Error_Msg_Uint_1 := UI_From_Int (System_Storage_Unit); | |
5839 | Error_Msg_N | |
5840 | ("stream size for elementary type must be a" | |
5841 | & " power of 2 and at least ^", N); | |
5842 | ||
5843 | elsif RM_Size (U_Ent) > Size then | |
5844 | Error_Msg_Uint_1 := RM_Size (U_Ent); | |
5845 | Error_Msg_N | |
5846 | ("stream size for elementary type must be a" | |
5847 | & " power of 2 and at least ^", N); | |
5848 | end if; | |
5849 | ||
5850 | Set_Has_Stream_Size_Clause (U_Ent); | |
5851 | ||
5852 | else | |
5853 | Error_Msg_N ("Stream_Size cannot be given for &", Nam); | |
5854 | end if; | |
5855 | end Stream_Size; | |
5856 | ||
d6f39728 | 5857 | ---------------- |
5858 | -- Value_Size -- | |
5859 | ---------------- | |
5860 | ||
5861 | -- Value_Size attribute definition clause | |
5862 | ||
5863 | when Attribute_Value_Size => Value_Size : declare | |
5864 | Size : constant Uint := Static_Integer (Expr); | |
5865 | Biased : Boolean; | |
5866 | ||
5867 | begin | |
5868 | if not Is_Type (U_Ent) then | |
5869 | Error_Msg_N ("Value_Size cannot be given for &", Nam); | |
5870 | ||
ae888dbd | 5871 | elsif Duplicate_Clause then |
5872 | null; | |
d6f39728 | 5873 | |
59ac57b5 | 5874 | elsif Is_Array_Type (U_Ent) |
5875 | and then not Is_Constrained (U_Ent) | |
5876 | then | |
5877 | Error_Msg_N | |
5878 | ("Value_Size cannot be given for unconstrained array", Nam); | |
5879 | ||
d6f39728 | 5880 | else |
5881 | if Is_Elementary_Type (U_Ent) then | |
5882 | Check_Size (Expr, U_Ent, Size, Biased); | |
b77e4501 | 5883 | Set_Biased (U_Ent, N, "value size clause", Biased); |
d6f39728 | 5884 | end if; |
5885 | ||
5886 | Set_RM_Size (U_Ent, Size); | |
5887 | end if; | |
5888 | end Value_Size; | |
5889 | ||
81b424ac | 5890 | ----------------------- |
5891 | -- Variable_Indexing -- | |
5892 | ----------------------- | |
5893 | ||
5894 | when Attribute_Variable_Indexing => | |
5895 | Check_Indexing_Functions; | |
5896 | ||
d6f39728 | 5897 | ----------- |
5898 | -- Write -- | |
5899 | ----------- | |
5900 | ||
9f373bb8 | 5901 | when Attribute_Write => |
5902 | Analyze_Stream_TSS_Definition (TSS_Stream_Write); | |
5903 | Set_Has_Specified_Stream_Write (Ent); | |
d6f39728 | 5904 | |
5905 | -- All other attributes cannot be set | |
5906 | ||
5907 | when others => | |
5908 | Error_Msg_N | |
5909 | ("attribute& cannot be set with definition clause", N); | |
d6f39728 | 5910 | end case; |
5911 | ||
d64221a7 | 5912 | -- The test for the type being frozen must be performed after any |
5913 | -- expression the clause has been analyzed since the expression itself | |
5914 | -- might cause freezing that makes the clause illegal. | |
d6f39728 | 5915 | |
5916 | if Rep_Item_Too_Late (U_Ent, N, FOnly) then | |
5917 | return; | |
5918 | end if; | |
5919 | end Analyze_Attribute_Definition_Clause; | |
5920 | ||
5921 | ---------------------------- | |
5922 | -- Analyze_Code_Statement -- | |
5923 | ---------------------------- | |
5924 | ||
5925 | procedure Analyze_Code_Statement (N : Node_Id) is | |
5926 | HSS : constant Node_Id := Parent (N); | |
5927 | SBody : constant Node_Id := Parent (HSS); | |
5928 | Subp : constant Entity_Id := Current_Scope; | |
5929 | Stmt : Node_Id; | |
5930 | Decl : Node_Id; | |
5931 | StmtO : Node_Id; | |
5932 | DeclO : Node_Id; | |
5933 | ||
5934 | begin | |
5935 | -- Analyze and check we get right type, note that this implements the | |
5936 | -- requirement (RM 13.8(1)) that Machine_Code be with'ed, since that | |
5937 | -- is the only way that Asm_Insn could possibly be visible. | |
5938 | ||
5939 | Analyze_And_Resolve (Expression (N)); | |
5940 | ||
5941 | if Etype (Expression (N)) = Any_Type then | |
5942 | return; | |
5943 | elsif Etype (Expression (N)) /= RTE (RE_Asm_Insn) then | |
5944 | Error_Msg_N ("incorrect type for code statement", N); | |
5945 | return; | |
5946 | end if; | |
5947 | ||
44e4341e | 5948 | Check_Code_Statement (N); |
5949 | ||
d6f39728 | 5950 | -- Make sure we appear in the handled statement sequence of a |
5951 | -- subprogram (RM 13.8(3)). | |
5952 | ||
5953 | if Nkind (HSS) /= N_Handled_Sequence_Of_Statements | |
5954 | or else Nkind (SBody) /= N_Subprogram_Body | |
5955 | then | |
5956 | Error_Msg_N | |
5957 | ("code statement can only appear in body of subprogram", N); | |
5958 | return; | |
5959 | end if; | |
5960 | ||
5961 | -- Do remaining checks (RM 13.8(3)) if not already done | |
5962 | ||
5963 | if not Is_Machine_Code_Subprogram (Subp) then | |
5964 | Set_Is_Machine_Code_Subprogram (Subp); | |
5965 | ||
5966 | -- No exception handlers allowed | |
5967 | ||
5968 | if Present (Exception_Handlers (HSS)) then | |
5969 | Error_Msg_N | |
5970 | ("exception handlers not permitted in machine code subprogram", | |
5971 | First (Exception_Handlers (HSS))); | |
5972 | end if; | |
5973 | ||
5974 | -- No declarations other than use clauses and pragmas (we allow | |
5975 | -- certain internally generated declarations as well). | |
5976 | ||
5977 | Decl := First (Declarations (SBody)); | |
5978 | while Present (Decl) loop | |
5979 | DeclO := Original_Node (Decl); | |
5980 | if Comes_From_Source (DeclO) | |
fdd294d1 | 5981 | and not Nkind_In (DeclO, N_Pragma, |
5982 | N_Use_Package_Clause, | |
5983 | N_Use_Type_Clause, | |
5984 | N_Implicit_Label_Declaration) | |
d6f39728 | 5985 | then |
5986 | Error_Msg_N | |
5987 | ("this declaration not allowed in machine code subprogram", | |
5988 | DeclO); | |
5989 | end if; | |
5990 | ||
5991 | Next (Decl); | |
5992 | end loop; | |
5993 | ||
5994 | -- No statements other than code statements, pragmas, and labels. | |
5995 | -- Again we allow certain internally generated statements. | |
3ab42ff7 | 5996 | |
c3107527 | 5997 | -- In Ada 2012, qualified expressions are names, and the code |
5998 | -- statement is initially parsed as a procedure call. | |
d6f39728 | 5999 | |
6000 | Stmt := First (Statements (HSS)); | |
6001 | while Present (Stmt) loop | |
6002 | StmtO := Original_Node (Stmt); | |
c3107527 | 6003 | |
59f2fcab | 6004 | -- A procedure call transformed into a code statement is OK. |
6005 | ||
c3107527 | 6006 | if Ada_Version >= Ada_2012 |
6007 | and then Nkind (StmtO) = N_Procedure_Call_Statement | |
59f2fcab | 6008 | and then Nkind (Name (StmtO)) = N_Qualified_Expression |
c3107527 | 6009 | then |
6010 | null; | |
6011 | ||
6012 | elsif Comes_From_Source (StmtO) | |
fdd294d1 | 6013 | and then not Nkind_In (StmtO, N_Pragma, |
6014 | N_Label, | |
6015 | N_Code_Statement) | |
d6f39728 | 6016 | then |
6017 | Error_Msg_N | |
6018 | ("this statement is not allowed in machine code subprogram", | |
6019 | StmtO); | |
6020 | end if; | |
6021 | ||
6022 | Next (Stmt); | |
6023 | end loop; | |
6024 | end if; | |
d6f39728 | 6025 | end Analyze_Code_Statement; |
6026 | ||
6027 | ----------------------------------------------- | |
6028 | -- Analyze_Enumeration_Representation_Clause -- | |
6029 | ----------------------------------------------- | |
6030 | ||
6031 | procedure Analyze_Enumeration_Representation_Clause (N : Node_Id) is | |
6032 | Ident : constant Node_Id := Identifier (N); | |
6033 | Aggr : constant Node_Id := Array_Aggregate (N); | |
6034 | Enumtype : Entity_Id; | |
6035 | Elit : Entity_Id; | |
6036 | Expr : Node_Id; | |
6037 | Assoc : Node_Id; | |
6038 | Choice : Node_Id; | |
6039 | Val : Uint; | |
b3190af0 | 6040 | |
6041 | Err : Boolean := False; | |
098d3082 | 6042 | -- Set True to avoid cascade errors and crashes on incorrect source code |
d6f39728 | 6043 | |
e30c7d84 | 6044 | Lo : constant Uint := Expr_Value (Type_Low_Bound (Universal_Integer)); |
6045 | Hi : constant Uint := Expr_Value (Type_High_Bound (Universal_Integer)); | |
6046 | -- Allowed range of universal integer (= allowed range of enum lit vals) | |
6047 | ||
d6f39728 | 6048 | Min : Uint; |
6049 | Max : Uint; | |
e30c7d84 | 6050 | -- Minimum and maximum values of entries |
6051 | ||
6052 | Max_Node : Node_Id; | |
6053 | -- Pointer to node for literal providing max value | |
d6f39728 | 6054 | |
6055 | begin | |
ca301e17 | 6056 | if Ignore_Rep_Clauses then |
2ff55065 | 6057 | Kill_Rep_Clause (N); |
fbc67f84 | 6058 | return; |
6059 | end if; | |
6060 | ||
175a6969 | 6061 | -- Ignore enumeration rep clauses by default in CodePeer mode, |
6062 | -- unless -gnatd.I is specified, as a work around for potential false | |
6063 | -- positive messages. | |
6064 | ||
6065 | if CodePeer_Mode and not Debug_Flag_Dot_II then | |
6066 | return; | |
6067 | end if; | |
6068 | ||
d6f39728 | 6069 | -- First some basic error checks |
6070 | ||
6071 | Find_Type (Ident); | |
6072 | Enumtype := Entity (Ident); | |
6073 | ||
6074 | if Enumtype = Any_Type | |
6075 | or else Rep_Item_Too_Early (Enumtype, N) | |
6076 | then | |
6077 | return; | |
6078 | else | |
6079 | Enumtype := Underlying_Type (Enumtype); | |
6080 | end if; | |
6081 | ||
6082 | if not Is_Enumeration_Type (Enumtype) then | |
6083 | Error_Msg_NE | |
6084 | ("enumeration type required, found}", | |
6085 | Ident, First_Subtype (Enumtype)); | |
6086 | return; | |
6087 | end if; | |
6088 | ||
9dfe12ae | 6089 | -- Ignore rep clause on generic actual type. This will already have |
6090 | -- been flagged on the template as an error, and this is the safest | |
6091 | -- way to ensure we don't get a junk cascaded message in the instance. | |
6092 | ||
6093 | if Is_Generic_Actual_Type (Enumtype) then | |
6094 | return; | |
6095 | ||
6096 | -- Type must be in current scope | |
6097 | ||
6098 | elsif Scope (Enumtype) /= Current_Scope then | |
d6f39728 | 6099 | Error_Msg_N ("type must be declared in this scope", Ident); |
6100 | return; | |
6101 | ||
9dfe12ae | 6102 | -- Type must be a first subtype |
6103 | ||
d6f39728 | 6104 | elsif not Is_First_Subtype (Enumtype) then |
6105 | Error_Msg_N ("cannot give enumeration rep clause for subtype", N); | |
6106 | return; | |
6107 | ||
9dfe12ae | 6108 | -- Ignore duplicate rep clause |
6109 | ||
d6f39728 | 6110 | elsif Has_Enumeration_Rep_Clause (Enumtype) then |
6111 | Error_Msg_N ("duplicate enumeration rep clause ignored", N); | |
6112 | return; | |
6113 | ||
7189d17f | 6114 | -- Don't allow rep clause for standard [wide_[wide_]]character |
9dfe12ae | 6115 | |
177675a7 | 6116 | elsif Is_Standard_Character_Type (Enumtype) then |
d6f39728 | 6117 | Error_Msg_N ("enumeration rep clause not allowed for this type", N); |
9dfe12ae | 6118 | return; |
6119 | ||
d9125581 | 6120 | -- Check that the expression is a proper aggregate (no parentheses) |
6121 | ||
6122 | elsif Paren_Count (Aggr) /= 0 then | |
6123 | Error_Msg | |
6124 | ("extra parentheses surrounding aggregate not allowed", | |
6125 | First_Sloc (Aggr)); | |
6126 | return; | |
6127 | ||
9dfe12ae | 6128 | -- All tests passed, so set rep clause in place |
d6f39728 | 6129 | |
6130 | else | |
6131 | Set_Has_Enumeration_Rep_Clause (Enumtype); | |
6132 | Set_Has_Enumeration_Rep_Clause (Base_Type (Enumtype)); | |
6133 | end if; | |
6134 | ||
6135 | -- Now we process the aggregate. Note that we don't use the normal | |
6136 | -- aggregate code for this purpose, because we don't want any of the | |
6137 | -- normal expansion activities, and a number of special semantic | |
6138 | -- rules apply (including the component type being any integer type) | |
6139 | ||
d6f39728 | 6140 | Elit := First_Literal (Enumtype); |
6141 | ||
6142 | -- First the positional entries if any | |
6143 | ||
6144 | if Present (Expressions (Aggr)) then | |
6145 | Expr := First (Expressions (Aggr)); | |
6146 | while Present (Expr) loop | |
6147 | if No (Elit) then | |
6148 | Error_Msg_N ("too many entries in aggregate", Expr); | |
6149 | return; | |
6150 | end if; | |
6151 | ||
6152 | Val := Static_Integer (Expr); | |
6153 | ||
d9125581 | 6154 | -- Err signals that we found some incorrect entries processing |
6155 | -- the list. The final checks for completeness and ordering are | |
6156 | -- skipped in this case. | |
6157 | ||
d6f39728 | 6158 | if Val = No_Uint then |
6159 | Err := True; | |
f02a9a9a | 6160 | |
d6f39728 | 6161 | elsif Val < Lo or else Hi < Val then |
6162 | Error_Msg_N ("value outside permitted range", Expr); | |
6163 | Err := True; | |
6164 | end if; | |
6165 | ||
6166 | Set_Enumeration_Rep (Elit, Val); | |
6167 | Set_Enumeration_Rep_Expr (Elit, Expr); | |
6168 | Next (Expr); | |
6169 | Next (Elit); | |
6170 | end loop; | |
6171 | end if; | |
6172 | ||
6173 | -- Now process the named entries if present | |
6174 | ||
6175 | if Present (Component_Associations (Aggr)) then | |
6176 | Assoc := First (Component_Associations (Aggr)); | |
6177 | while Present (Assoc) loop | |
6178 | Choice := First (Choices (Assoc)); | |
6179 | ||
6180 | if Present (Next (Choice)) then | |
6181 | Error_Msg_N | |
6182 | ("multiple choice not allowed here", Next (Choice)); | |
6183 | Err := True; | |
6184 | end if; | |
6185 | ||
6186 | if Nkind (Choice) = N_Others_Choice then | |
6187 | Error_Msg_N ("others choice not allowed here", Choice); | |
6188 | Err := True; | |
6189 | ||
6190 | elsif Nkind (Choice) = N_Range then | |
b3190af0 | 6191 | |
d6f39728 | 6192 | -- ??? should allow zero/one element range here |
b3190af0 | 6193 | |
d6f39728 | 6194 | Error_Msg_N ("range not allowed here", Choice); |
6195 | Err := True; | |
6196 | ||
6197 | else | |
6198 | Analyze_And_Resolve (Choice, Enumtype); | |
b3190af0 | 6199 | |
098d3082 | 6200 | if Error_Posted (Choice) then |
d6f39728 | 6201 | Err := True; |
098d3082 | 6202 | end if; |
d6f39728 | 6203 | |
098d3082 | 6204 | if not Err then |
6205 | if Is_Entity_Name (Choice) | |
6206 | and then Is_Type (Entity (Choice)) | |
6207 | then | |
6208 | Error_Msg_N ("subtype name not allowed here", Choice); | |
d6f39728 | 6209 | Err := True; |
b3190af0 | 6210 | |
098d3082 | 6211 | -- ??? should allow static subtype with zero/one entry |
d6f39728 | 6212 | |
098d3082 | 6213 | elsif Etype (Choice) = Base_Type (Enumtype) then |
cda40848 | 6214 | if not Is_OK_Static_Expression (Choice) then |
098d3082 | 6215 | Flag_Non_Static_Expr |
6216 | ("non-static expression used for choice!", Choice); | |
d6f39728 | 6217 | Err := True; |
d6f39728 | 6218 | |
098d3082 | 6219 | else |
6220 | Elit := Expr_Value_E (Choice); | |
6221 | ||
6222 | if Present (Enumeration_Rep_Expr (Elit)) then | |
6223 | Error_Msg_Sloc := | |
6224 | Sloc (Enumeration_Rep_Expr (Elit)); | |
6225 | Error_Msg_NE | |
6226 | ("representation for& previously given#", | |
6227 | Choice, Elit); | |
6228 | Err := True; | |
6229 | end if; | |
d6f39728 | 6230 | |
098d3082 | 6231 | Set_Enumeration_Rep_Expr (Elit, Expression (Assoc)); |
d6f39728 | 6232 | |
098d3082 | 6233 | Expr := Expression (Assoc); |
6234 | Val := Static_Integer (Expr); | |
d6f39728 | 6235 | |
098d3082 | 6236 | if Val = No_Uint then |
6237 | Err := True; | |
6238 | ||
6239 | elsif Val < Lo or else Hi < Val then | |
6240 | Error_Msg_N ("value outside permitted range", Expr); | |
6241 | Err := True; | |
6242 | end if; | |
d6f39728 | 6243 | |
098d3082 | 6244 | Set_Enumeration_Rep (Elit, Val); |
6245 | end if; | |
d6f39728 | 6246 | end if; |
6247 | end if; | |
6248 | end if; | |
6249 | ||
6250 | Next (Assoc); | |
6251 | end loop; | |
6252 | end if; | |
6253 | ||
6254 | -- Aggregate is fully processed. Now we check that a full set of | |
6255 | -- representations was given, and that they are in range and in order. | |
6256 | -- These checks are only done if no other errors occurred. | |
6257 | ||
6258 | if not Err then | |
6259 | Min := No_Uint; | |
6260 | Max := No_Uint; | |
6261 | ||
6262 | Elit := First_Literal (Enumtype); | |
6263 | while Present (Elit) loop | |
6264 | if No (Enumeration_Rep_Expr (Elit)) then | |
6265 | Error_Msg_NE ("missing representation for&!", N, Elit); | |
6266 | ||
6267 | else | |
6268 | Val := Enumeration_Rep (Elit); | |
6269 | ||
6270 | if Min = No_Uint then | |
6271 | Min := Val; | |
6272 | end if; | |
6273 | ||
6274 | if Val /= No_Uint then | |
6275 | if Max /= No_Uint and then Val <= Max then | |
6276 | Error_Msg_NE | |
6277 | ("enumeration value for& not ordered!", | |
e30c7d84 | 6278 | Enumeration_Rep_Expr (Elit), Elit); |
d6f39728 | 6279 | end if; |
6280 | ||
e30c7d84 | 6281 | Max_Node := Enumeration_Rep_Expr (Elit); |
d6f39728 | 6282 | Max := Val; |
6283 | end if; | |
6284 | ||
e30c7d84 | 6285 | -- If there is at least one literal whose representation is not |
6286 | -- equal to the Pos value, then note that this enumeration type | |
6287 | -- has a non-standard representation. | |
d6f39728 | 6288 | |
6289 | if Val /= Enumeration_Pos (Elit) then | |
6290 | Set_Has_Non_Standard_Rep (Base_Type (Enumtype)); | |
6291 | end if; | |
6292 | end if; | |
6293 | ||
6294 | Next (Elit); | |
6295 | end loop; | |
6296 | ||
6297 | -- Now set proper size information | |
6298 | ||
6299 | declare | |
6300 | Minsize : Uint := UI_From_Int (Minimum_Size (Enumtype)); | |
6301 | ||
6302 | begin | |
6303 | if Has_Size_Clause (Enumtype) then | |
e30c7d84 | 6304 | |
6305 | -- All OK, if size is OK now | |
6306 | ||
6307 | if RM_Size (Enumtype) >= Minsize then | |
d6f39728 | 6308 | null; |
6309 | ||
6310 | else | |
e30c7d84 | 6311 | -- Try if we can get by with biasing |
6312 | ||
d6f39728 | 6313 | Minsize := |
6314 | UI_From_Int (Minimum_Size (Enumtype, Biased => True)); | |
6315 | ||
e30c7d84 | 6316 | -- Error message if even biasing does not work |
6317 | ||
6318 | if RM_Size (Enumtype) < Minsize then | |
6319 | Error_Msg_Uint_1 := RM_Size (Enumtype); | |
6320 | Error_Msg_Uint_2 := Max; | |
6321 | Error_Msg_N | |
6322 | ("previously given size (^) is too small " | |
6323 | & "for this value (^)", Max_Node); | |
6324 | ||
6325 | -- If biasing worked, indicate that we now have biased rep | |
d6f39728 | 6326 | |
6327 | else | |
b77e4501 | 6328 | Set_Biased |
6329 | (Enumtype, Size_Clause (Enumtype), "size clause"); | |
d6f39728 | 6330 | end if; |
6331 | end if; | |
6332 | ||
6333 | else | |
6334 | Set_RM_Size (Enumtype, Minsize); | |
6335 | Set_Enum_Esize (Enumtype); | |
6336 | end if; | |
6337 | ||
6338 | Set_RM_Size (Base_Type (Enumtype), RM_Size (Enumtype)); | |
6339 | Set_Esize (Base_Type (Enumtype), Esize (Enumtype)); | |
6340 | Set_Alignment (Base_Type (Enumtype), Alignment (Enumtype)); | |
6341 | end; | |
6342 | end if; | |
6343 | ||
39a0c1d3 | 6344 | -- We repeat the too late test in case it froze itself |
d6f39728 | 6345 | |
6346 | if Rep_Item_Too_Late (Enumtype, N) then | |
6347 | null; | |
6348 | end if; | |
d6f39728 | 6349 | end Analyze_Enumeration_Representation_Clause; |
6350 | ||
6351 | ---------------------------- | |
6352 | -- Analyze_Free_Statement -- | |
6353 | ---------------------------- | |
6354 | ||
6355 | procedure Analyze_Free_Statement (N : Node_Id) is | |
6356 | begin | |
6357 | Analyze (Expression (N)); | |
6358 | end Analyze_Free_Statement; | |
6359 | ||
40ca69b9 | 6360 | --------------------------- |
6361 | -- Analyze_Freeze_Entity -- | |
6362 | --------------------------- | |
6363 | ||
6364 | procedure Analyze_Freeze_Entity (N : Node_Id) is | |
40ca69b9 | 6365 | begin |
d9f6a4ee | 6366 | Freeze_Entity_Checks (N); |
6367 | end Analyze_Freeze_Entity; | |
98f7db28 | 6368 | |
d9f6a4ee | 6369 | ----------------------------------- |
6370 | -- Analyze_Freeze_Generic_Entity -- | |
6371 | ----------------------------------- | |
98f7db28 | 6372 | |
d9f6a4ee | 6373 | procedure Analyze_Freeze_Generic_Entity (N : Node_Id) is |
6374 | begin | |
6375 | Freeze_Entity_Checks (N); | |
6376 | end Analyze_Freeze_Generic_Entity; | |
40ca69b9 | 6377 | |
d9f6a4ee | 6378 | ------------------------------------------ |
6379 | -- Analyze_Record_Representation_Clause -- | |
6380 | ------------------------------------------ | |
c8da6114 | 6381 | |
d9f6a4ee | 6382 | -- Note: we check as much as we can here, but we can't do any checks |
6383 | -- based on the position values (e.g. overlap checks) until freeze time | |
6384 | -- because especially in Ada 2005 (machine scalar mode), the processing | |
6385 | -- for non-standard bit order can substantially change the positions. | |
6386 | -- See procedure Check_Record_Representation_Clause (called from Freeze) | |
6387 | -- for the remainder of this processing. | |
d00681a7 | 6388 | |
d9f6a4ee | 6389 | procedure Analyze_Record_Representation_Clause (N : Node_Id) is |
6390 | Ident : constant Node_Id := Identifier (N); | |
6391 | Biased : Boolean; | |
6392 | CC : Node_Id; | |
6393 | Comp : Entity_Id; | |
6394 | Fbit : Uint; | |
6395 | Hbit : Uint := Uint_0; | |
6396 | Lbit : Uint; | |
6397 | Ocomp : Entity_Id; | |
6398 | Posit : Uint; | |
6399 | Rectype : Entity_Id; | |
6400 | Recdef : Node_Id; | |
d00681a7 | 6401 | |
d9f6a4ee | 6402 | function Is_Inherited (Comp : Entity_Id) return Boolean; |
6403 | -- True if Comp is an inherited component in a record extension | |
d00681a7 | 6404 | |
d9f6a4ee | 6405 | ------------------ |
6406 | -- Is_Inherited -- | |
6407 | ------------------ | |
d00681a7 | 6408 | |
d9f6a4ee | 6409 | function Is_Inherited (Comp : Entity_Id) return Boolean is |
6410 | Comp_Base : Entity_Id; | |
d00681a7 | 6411 | |
d9f6a4ee | 6412 | begin |
6413 | if Ekind (Rectype) = E_Record_Subtype then | |
6414 | Comp_Base := Original_Record_Component (Comp); | |
6415 | else | |
6416 | Comp_Base := Comp; | |
d00681a7 | 6417 | end if; |
6418 | ||
d9f6a4ee | 6419 | return Comp_Base /= Original_Record_Component (Comp_Base); |
6420 | end Is_Inherited; | |
d00681a7 | 6421 | |
d9f6a4ee | 6422 | -- Local variables |
d00681a7 | 6423 | |
d9f6a4ee | 6424 | Is_Record_Extension : Boolean; |
6425 | -- True if Rectype is a record extension | |
d00681a7 | 6426 | |
d9f6a4ee | 6427 | CR_Pragma : Node_Id := Empty; |
6428 | -- Points to N_Pragma node if Complete_Representation pragma present | |
d00681a7 | 6429 | |
d9f6a4ee | 6430 | -- Start of processing for Analyze_Record_Representation_Clause |
d00681a7 | 6431 | |
d9f6a4ee | 6432 | begin |
6433 | if Ignore_Rep_Clauses then | |
2ff55065 | 6434 | Kill_Rep_Clause (N); |
d9f6a4ee | 6435 | return; |
d00681a7 | 6436 | end if; |
98f7db28 | 6437 | |
d9f6a4ee | 6438 | Find_Type (Ident); |
6439 | Rectype := Entity (Ident); | |
85377c9b | 6440 | |
d9f6a4ee | 6441 | if Rectype = Any_Type or else Rep_Item_Too_Early (Rectype, N) then |
6442 | return; | |
6443 | else | |
6444 | Rectype := Underlying_Type (Rectype); | |
6445 | end if; | |
85377c9b | 6446 | |
d9f6a4ee | 6447 | -- First some basic error checks |
85377c9b | 6448 | |
d9f6a4ee | 6449 | if not Is_Record_Type (Rectype) then |
6450 | Error_Msg_NE | |
6451 | ("record type required, found}", Ident, First_Subtype (Rectype)); | |
6452 | return; | |
85377c9b | 6453 | |
d9f6a4ee | 6454 | elsif Scope (Rectype) /= Current_Scope then |
6455 | Error_Msg_N ("type must be declared in this scope", N); | |
6456 | return; | |
85377c9b | 6457 | |
d9f6a4ee | 6458 | elsif not Is_First_Subtype (Rectype) then |
6459 | Error_Msg_N ("cannot give record rep clause for subtype", N); | |
6460 | return; | |
9dc88aea | 6461 | |
d9f6a4ee | 6462 | elsif Has_Record_Rep_Clause (Rectype) then |
6463 | Error_Msg_N ("duplicate record rep clause ignored", N); | |
6464 | return; | |
9dc88aea | 6465 | |
d9f6a4ee | 6466 | elsif Rep_Item_Too_Late (Rectype, N) then |
6467 | return; | |
9dc88aea | 6468 | end if; |
fb7f2fc4 | 6469 | |
d9f6a4ee | 6470 | -- We know we have a first subtype, now possibly go the the anonymous |
6471 | -- base type to determine whether Rectype is a record extension. | |
89f1e35c | 6472 | |
d9f6a4ee | 6473 | Recdef := Type_Definition (Declaration_Node (Base_Type (Rectype))); |
6474 | Is_Record_Extension := | |
6475 | Nkind (Recdef) = N_Derived_Type_Definition | |
6476 | and then Present (Record_Extension_Part (Recdef)); | |
89f1e35c | 6477 | |
d9f6a4ee | 6478 | if Present (Mod_Clause (N)) then |
fb7f2fc4 | 6479 | declare |
d9f6a4ee | 6480 | Loc : constant Source_Ptr := Sloc (N); |
6481 | M : constant Node_Id := Mod_Clause (N); | |
6482 | P : constant List_Id := Pragmas_Before (M); | |
6483 | AtM_Nod : Node_Id; | |
6484 | ||
6485 | Mod_Val : Uint; | |
6486 | pragma Warnings (Off, Mod_Val); | |
fb7f2fc4 | 6487 | |
6488 | begin | |
d9f6a4ee | 6489 | Check_Restriction (No_Obsolescent_Features, Mod_Clause (N)); |
fb7f2fc4 | 6490 | |
d9f6a4ee | 6491 | if Warn_On_Obsolescent_Feature then |
6492 | Error_Msg_N | |
6493 | ("?j?mod clause is an obsolescent feature (RM J.8)", N); | |
6494 | Error_Msg_N | |
6495 | ("\?j?use alignment attribute definition clause instead", N); | |
6496 | end if; | |
fb7f2fc4 | 6497 | |
d9f6a4ee | 6498 | if Present (P) then |
6499 | Analyze_List (P); | |
6500 | end if; | |
89f1e35c | 6501 | |
d9f6a4ee | 6502 | -- In ASIS_Mode mode, expansion is disabled, but we must convert |
6503 | -- the Mod clause into an alignment clause anyway, so that the | |
6504 | -- back-end can compute and back-annotate properly the size and | |
6505 | -- alignment of types that may include this record. | |
be9124d0 | 6506 | |
d9f6a4ee | 6507 | -- This seems dubious, this destroys the source tree in a manner |
6508 | -- not detectable by ASIS ??? | |
be9124d0 | 6509 | |
d9f6a4ee | 6510 | if Operating_Mode = Check_Semantics and then ASIS_Mode then |
6511 | AtM_Nod := | |
6512 | Make_Attribute_Definition_Clause (Loc, | |
83c6c069 | 6513 | Name => New_Occurrence_Of (Base_Type (Rectype), Loc), |
d9f6a4ee | 6514 | Chars => Name_Alignment, |
6515 | Expression => Relocate_Node (Expression (M))); | |
be9124d0 | 6516 | |
d9f6a4ee | 6517 | Set_From_At_Mod (AtM_Nod); |
6518 | Insert_After (N, AtM_Nod); | |
6519 | Mod_Val := Get_Alignment_Value (Expression (AtM_Nod)); | |
6520 | Set_Mod_Clause (N, Empty); | |
be9124d0 | 6521 | |
d9f6a4ee | 6522 | else |
6523 | -- Get the alignment value to perform error checking | |
be9124d0 | 6524 | |
d9f6a4ee | 6525 | Mod_Val := Get_Alignment_Value (Expression (M)); |
6526 | end if; | |
6527 | end; | |
6528 | end if; | |
be9124d0 | 6529 | |
d9f6a4ee | 6530 | -- For untagged types, clear any existing component clauses for the |
6531 | -- type. If the type is derived, this is what allows us to override | |
6532 | -- a rep clause for the parent. For type extensions, the representation | |
6533 | -- of the inherited components is inherited, so we want to keep previous | |
6534 | -- component clauses for completeness. | |
be9124d0 | 6535 | |
d9f6a4ee | 6536 | if not Is_Tagged_Type (Rectype) then |
6537 | Comp := First_Component_Or_Discriminant (Rectype); | |
6538 | while Present (Comp) loop | |
6539 | Set_Component_Clause (Comp, Empty); | |
6540 | Next_Component_Or_Discriminant (Comp); | |
6541 | end loop; | |
6542 | end if; | |
be9124d0 | 6543 | |
d9f6a4ee | 6544 | -- All done if no component clauses |
be9124d0 | 6545 | |
d9f6a4ee | 6546 | CC := First (Component_Clauses (N)); |
be9124d0 | 6547 | |
d9f6a4ee | 6548 | if No (CC) then |
6549 | return; | |
6550 | end if; | |
be9124d0 | 6551 | |
d9f6a4ee | 6552 | -- A representation like this applies to the base type |
be9124d0 | 6553 | |
d9f6a4ee | 6554 | Set_Has_Record_Rep_Clause (Base_Type (Rectype)); |
6555 | Set_Has_Non_Standard_Rep (Base_Type (Rectype)); | |
6556 | Set_Has_Specified_Layout (Base_Type (Rectype)); | |
be9124d0 | 6557 | |
d9f6a4ee | 6558 | -- Process the component clauses |
be9124d0 | 6559 | |
d9f6a4ee | 6560 | while Present (CC) loop |
be9124d0 | 6561 | |
d9f6a4ee | 6562 | -- Pragma |
be9124d0 | 6563 | |
d9f6a4ee | 6564 | if Nkind (CC) = N_Pragma then |
6565 | Analyze (CC); | |
be9124d0 | 6566 | |
d9f6a4ee | 6567 | -- The only pragma of interest is Complete_Representation |
be9124d0 | 6568 | |
d9f6a4ee | 6569 | if Pragma_Name (CC) = Name_Complete_Representation then |
6570 | CR_Pragma := CC; | |
6571 | end if; | |
be9124d0 | 6572 | |
d9f6a4ee | 6573 | -- Processing for real component clause |
be9124d0 | 6574 | |
d9f6a4ee | 6575 | else |
6576 | Posit := Static_Integer (Position (CC)); | |
6577 | Fbit := Static_Integer (First_Bit (CC)); | |
6578 | Lbit := Static_Integer (Last_Bit (CC)); | |
be9124d0 | 6579 | |
d9f6a4ee | 6580 | if Posit /= No_Uint |
6581 | and then Fbit /= No_Uint | |
6582 | and then Lbit /= No_Uint | |
6583 | then | |
6584 | if Posit < 0 then | |
6585 | Error_Msg_N | |
6586 | ("position cannot be negative", Position (CC)); | |
be9124d0 | 6587 | |
d9f6a4ee | 6588 | elsif Fbit < 0 then |
6589 | Error_Msg_N | |
6590 | ("first bit cannot be negative", First_Bit (CC)); | |
be9124d0 | 6591 | |
d9f6a4ee | 6592 | -- The Last_Bit specified in a component clause must not be |
6593 | -- less than the First_Bit minus one (RM-13.5.1(10)). | |
be9124d0 | 6594 | |
d9f6a4ee | 6595 | elsif Lbit < Fbit - 1 then |
6596 | Error_Msg_N | |
6597 | ("last bit cannot be less than first bit minus one", | |
6598 | Last_Bit (CC)); | |
be9124d0 | 6599 | |
d9f6a4ee | 6600 | -- Values look OK, so find the corresponding record component |
6601 | -- Even though the syntax allows an attribute reference for | |
6602 | -- implementation-defined components, GNAT does not allow the | |
6603 | -- tag to get an explicit position. | |
be9124d0 | 6604 | |
d9f6a4ee | 6605 | elsif Nkind (Component_Name (CC)) = N_Attribute_Reference then |
6606 | if Attribute_Name (Component_Name (CC)) = Name_Tag then | |
6607 | Error_Msg_N ("position of tag cannot be specified", CC); | |
6608 | else | |
6609 | Error_Msg_N ("illegal component name", CC); | |
6610 | end if; | |
be9124d0 | 6611 | |
d9f6a4ee | 6612 | else |
6613 | Comp := First_Entity (Rectype); | |
6614 | while Present (Comp) loop | |
6615 | exit when Chars (Comp) = Chars (Component_Name (CC)); | |
6616 | Next_Entity (Comp); | |
6617 | end loop; | |
be9124d0 | 6618 | |
d9f6a4ee | 6619 | if No (Comp) then |
be9124d0 | 6620 | |
d9f6a4ee | 6621 | -- Maybe component of base type that is absent from |
6622 | -- statically constrained first subtype. | |
be9124d0 | 6623 | |
d9f6a4ee | 6624 | Comp := First_Entity (Base_Type (Rectype)); |
6625 | while Present (Comp) loop | |
6626 | exit when Chars (Comp) = Chars (Component_Name (CC)); | |
6627 | Next_Entity (Comp); | |
6628 | end loop; | |
6629 | end if; | |
be9124d0 | 6630 | |
d9f6a4ee | 6631 | if No (Comp) then |
6632 | Error_Msg_N | |
6633 | ("component clause is for non-existent field", CC); | |
be9124d0 | 6634 | |
d9f6a4ee | 6635 | -- Ada 2012 (AI05-0026): Any name that denotes a |
6636 | -- discriminant of an object of an unchecked union type | |
6637 | -- shall not occur within a record_representation_clause. | |
be9124d0 | 6638 | |
d9f6a4ee | 6639 | -- The general restriction of using record rep clauses on |
6640 | -- Unchecked_Union types has now been lifted. Since it is | |
6641 | -- possible to introduce a record rep clause which mentions | |
6642 | -- the discriminant of an Unchecked_Union in non-Ada 2012 | |
6643 | -- code, this check is applied to all versions of the | |
6644 | -- language. | |
be9124d0 | 6645 | |
d9f6a4ee | 6646 | elsif Ekind (Comp) = E_Discriminant |
6647 | and then Is_Unchecked_Union (Rectype) | |
6648 | then | |
6649 | Error_Msg_N | |
6650 | ("cannot reference discriminant of unchecked union", | |
6651 | Component_Name (CC)); | |
be9124d0 | 6652 | |
d9f6a4ee | 6653 | elsif Is_Record_Extension and then Is_Inherited (Comp) then |
6654 | Error_Msg_NE | |
6655 | ("component clause not allowed for inherited " | |
6656 | & "component&", CC, Comp); | |
40ca69b9 | 6657 | |
d9f6a4ee | 6658 | elsif Present (Component_Clause (Comp)) then |
462a079f | 6659 | |
d9f6a4ee | 6660 | -- Diagnose duplicate rep clause, or check consistency |
6661 | -- if this is an inherited component. In a double fault, | |
6662 | -- there may be a duplicate inconsistent clause for an | |
6663 | -- inherited component. | |
462a079f | 6664 | |
d9f6a4ee | 6665 | if Scope (Original_Record_Component (Comp)) = Rectype |
6666 | or else Parent (Component_Clause (Comp)) = N | |
6667 | then | |
6668 | Error_Msg_Sloc := Sloc (Component_Clause (Comp)); | |
6669 | Error_Msg_N ("component clause previously given#", CC); | |
3062c401 | 6670 | |
6671 | else | |
6672 | declare | |
6673 | Rep1 : constant Node_Id := Component_Clause (Comp); | |
3062c401 | 6674 | begin |
6675 | if Intval (Position (Rep1)) /= | |
6676 | Intval (Position (CC)) | |
6677 | or else Intval (First_Bit (Rep1)) /= | |
6678 | Intval (First_Bit (CC)) | |
6679 | or else Intval (Last_Bit (Rep1)) /= | |
6680 | Intval (Last_Bit (CC)) | |
6681 | then | |
b9e61b2a | 6682 | Error_Msg_N |
6683 | ("component clause inconsistent " | |
6684 | & "with representation of ancestor", CC); | |
6a06584c | 6685 | |
3062c401 | 6686 | elsif Warn_On_Redundant_Constructs then |
b9e61b2a | 6687 | Error_Msg_N |
6a06584c | 6688 | ("?r?redundant confirming component clause " |
6689 | & "for component!", CC); | |
3062c401 | 6690 | end if; |
6691 | end; | |
6692 | end if; | |
d6f39728 | 6693 | |
d2b860b4 | 6694 | -- Normal case where this is the first component clause we |
6695 | -- have seen for this entity, so set it up properly. | |
6696 | ||
d6f39728 | 6697 | else |
83f8f0a6 | 6698 | -- Make reference for field in record rep clause and set |
6699 | -- appropriate entity field in the field identifier. | |
6700 | ||
6701 | Generate_Reference | |
6702 | (Comp, Component_Name (CC), Set_Ref => False); | |
6703 | Set_Entity (Component_Name (CC), Comp); | |
6704 | ||
2866d595 | 6705 | -- Update Fbit and Lbit to the actual bit number |
d6f39728 | 6706 | |
6707 | Fbit := Fbit + UI_From_Int (SSU) * Posit; | |
6708 | Lbit := Lbit + UI_From_Int (SSU) * Posit; | |
6709 | ||
d6f39728 | 6710 | if Has_Size_Clause (Rectype) |
ada34def | 6711 | and then RM_Size (Rectype) <= Lbit |
d6f39728 | 6712 | then |
6713 | Error_Msg_N | |
6714 | ("bit number out of range of specified size", | |
6715 | Last_Bit (CC)); | |
6716 | else | |
6717 | Set_Component_Clause (Comp, CC); | |
6718 | Set_Component_Bit_Offset (Comp, Fbit); | |
6719 | Set_Esize (Comp, 1 + (Lbit - Fbit)); | |
6720 | Set_Normalized_First_Bit (Comp, Fbit mod SSU); | |
6721 | Set_Normalized_Position (Comp, Fbit / SSU); | |
6722 | ||
a0fc8c5b | 6723 | if Warn_On_Overridden_Size |
6724 | and then Has_Size_Clause (Etype (Comp)) | |
6725 | and then RM_Size (Etype (Comp)) /= Esize (Comp) | |
6726 | then | |
6727 | Error_Msg_NE | |
1e3532e7 | 6728 | ("?S?component size overrides size clause for&", |
a0fc8c5b | 6729 | Component_Name (CC), Etype (Comp)); |
6730 | end if; | |
6731 | ||
ea61a7ea | 6732 | -- This information is also set in the corresponding |
6733 | -- component of the base type, found by accessing the | |
6734 | -- Original_Record_Component link if it is present. | |
d6f39728 | 6735 | |
6736 | Ocomp := Original_Record_Component (Comp); | |
6737 | ||
6738 | if Hbit < Lbit then | |
6739 | Hbit := Lbit; | |
6740 | end if; | |
6741 | ||
6742 | Check_Size | |
6743 | (Component_Name (CC), | |
6744 | Etype (Comp), | |
6745 | Esize (Comp), | |
6746 | Biased); | |
6747 | ||
b77e4501 | 6748 | Set_Biased |
6749 | (Comp, First_Node (CC), "component clause", Biased); | |
cc46ff4b | 6750 | |
d6f39728 | 6751 | if Present (Ocomp) then |
6752 | Set_Component_Clause (Ocomp, CC); | |
6753 | Set_Component_Bit_Offset (Ocomp, Fbit); | |
6754 | Set_Normalized_First_Bit (Ocomp, Fbit mod SSU); | |
6755 | Set_Normalized_Position (Ocomp, Fbit / SSU); | |
6756 | Set_Esize (Ocomp, 1 + (Lbit - Fbit)); | |
6757 | ||
6758 | Set_Normalized_Position_Max | |
6759 | (Ocomp, Normalized_Position (Ocomp)); | |
6760 | ||
b77e4501 | 6761 | -- Note: we don't use Set_Biased here, because we |
6762 | -- already gave a warning above if needed, and we | |
6763 | -- would get a duplicate for the same name here. | |
6764 | ||
d6f39728 | 6765 | Set_Has_Biased_Representation |
6766 | (Ocomp, Has_Biased_Representation (Comp)); | |
6767 | end if; | |
6768 | ||
6769 | if Esize (Comp) < 0 then | |
6770 | Error_Msg_N ("component size is negative", CC); | |
6771 | end if; | |
6772 | end if; | |
6773 | end if; | |
6774 | end if; | |
6775 | end if; | |
6776 | end if; | |
6777 | ||
6778 | Next (CC); | |
6779 | end loop; | |
6780 | ||
67278d60 | 6781 | -- Check missing components if Complete_Representation pragma appeared |
d6f39728 | 6782 | |
67278d60 | 6783 | if Present (CR_Pragma) then |
6784 | Comp := First_Component_Or_Discriminant (Rectype); | |
6785 | while Present (Comp) loop | |
6786 | if No (Component_Clause (Comp)) then | |
6787 | Error_Msg_NE | |
6788 | ("missing component clause for &", CR_Pragma, Comp); | |
6789 | end if; | |
d6f39728 | 6790 | |
67278d60 | 6791 | Next_Component_Or_Discriminant (Comp); |
6792 | end loop; | |
d6f39728 | 6793 | |
1e3532e7 | 6794 | -- Give missing components warning if required |
15ebb600 | 6795 | |
fdd294d1 | 6796 | elsif Warn_On_Unrepped_Components then |
15ebb600 | 6797 | declare |
6798 | Num_Repped_Components : Nat := 0; | |
6799 | Num_Unrepped_Components : Nat := 0; | |
6800 | ||
6801 | begin | |
6802 | -- First count number of repped and unrepped components | |
6803 | ||
6804 | Comp := First_Component_Or_Discriminant (Rectype); | |
6805 | while Present (Comp) loop | |
6806 | if Present (Component_Clause (Comp)) then | |
6807 | Num_Repped_Components := Num_Repped_Components + 1; | |
6808 | else | |
6809 | Num_Unrepped_Components := Num_Unrepped_Components + 1; | |
6810 | end if; | |
6811 | ||
6812 | Next_Component_Or_Discriminant (Comp); | |
6813 | end loop; | |
6814 | ||
6815 | -- We are only interested in the case where there is at least one | |
6816 | -- unrepped component, and at least half the components have rep | |
6817 | -- clauses. We figure that if less than half have them, then the | |
87f9eef5 | 6818 | -- partial rep clause is really intentional. If the component |
6819 | -- type has no underlying type set at this point (as for a generic | |
6820 | -- formal type), we don't know enough to give a warning on the | |
6821 | -- component. | |
15ebb600 | 6822 | |
6823 | if Num_Unrepped_Components > 0 | |
6824 | and then Num_Unrepped_Components < Num_Repped_Components | |
6825 | then | |
6826 | Comp := First_Component_Or_Discriminant (Rectype); | |
6827 | while Present (Comp) loop | |
83f8f0a6 | 6828 | if No (Component_Clause (Comp)) |
3062c401 | 6829 | and then Comes_From_Source (Comp) |
87f9eef5 | 6830 | and then Present (Underlying_Type (Etype (Comp))) |
83f8f0a6 | 6831 | and then (Is_Scalar_Type (Underlying_Type (Etype (Comp))) |
67278d60 | 6832 | or else Size_Known_At_Compile_Time |
6833 | (Underlying_Type (Etype (Comp)))) | |
fdd294d1 | 6834 | and then not Has_Warnings_Off (Rectype) |
2be1f7d7 | 6835 | |
6836 | -- Ignore discriminant in unchecked union, since it is | |
6837 | -- not there, and cannot have a component clause. | |
6838 | ||
6839 | and then (not Is_Unchecked_Union (Rectype) | |
6840 | or else Ekind (Comp) /= E_Discriminant) | |
83f8f0a6 | 6841 | then |
15ebb600 | 6842 | Error_Msg_Sloc := Sloc (Comp); |
6843 | Error_Msg_NE | |
1e3532e7 | 6844 | ("?C?no component clause given for & declared #", |
15ebb600 | 6845 | N, Comp); |
6846 | end if; | |
6847 | ||
6848 | Next_Component_Or_Discriminant (Comp); | |
6849 | end loop; | |
6850 | end if; | |
6851 | end; | |
d6f39728 | 6852 | end if; |
d6f39728 | 6853 | end Analyze_Record_Representation_Clause; |
6854 | ||
eb66e842 | 6855 | ------------------------------------- |
6856 | -- Build_Discrete_Static_Predicate -- | |
6857 | ------------------------------------- | |
9ea61fdd | 6858 | |
eb66e842 | 6859 | procedure Build_Discrete_Static_Predicate |
6860 | (Typ : Entity_Id; | |
6861 | Expr : Node_Id; | |
6862 | Nam : Name_Id) | |
9ea61fdd | 6863 | is |
eb66e842 | 6864 | Loc : constant Source_Ptr := Sloc (Expr); |
9ea61fdd | 6865 | |
eb66e842 | 6866 | Non_Static : exception; |
6867 | -- Raised if something non-static is found | |
9ea61fdd | 6868 | |
eb66e842 | 6869 | Btyp : constant Entity_Id := Base_Type (Typ); |
9ea61fdd | 6870 | |
eb66e842 | 6871 | BLo : constant Uint := Expr_Value (Type_Low_Bound (Btyp)); |
6872 | BHi : constant Uint := Expr_Value (Type_High_Bound (Btyp)); | |
6873 | -- Low bound and high bound value of base type of Typ | |
9ea61fdd | 6874 | |
afc229da | 6875 | TLo : Uint; |
6876 | THi : Uint; | |
6877 | -- Bounds for constructing the static predicate. We use the bound of the | |
6878 | -- subtype if it is static, otherwise the corresponding base type bound. | |
6879 | -- Note: a non-static subtype can have a static predicate. | |
9ea61fdd | 6880 | |
eb66e842 | 6881 | type REnt is record |
6882 | Lo, Hi : Uint; | |
6883 | end record; | |
6884 | -- One entry in a Rlist value, a single REnt (range entry) value denotes | |
6885 | -- one range from Lo to Hi. To represent a single value range Lo = Hi = | |
6886 | -- value. | |
9ea61fdd | 6887 | |
eb66e842 | 6888 | type RList is array (Nat range <>) of REnt; |
6889 | -- A list of ranges. The ranges are sorted in increasing order, and are | |
6890 | -- disjoint (there is a gap of at least one value between each range in | |
6891 | -- the table). A value is in the set of ranges in Rlist if it lies | |
6892 | -- within one of these ranges. | |
9ea61fdd | 6893 | |
eb66e842 | 6894 | False_Range : constant RList := |
6895 | RList'(1 .. 0 => REnt'(No_Uint, No_Uint)); | |
6896 | -- An empty set of ranges represents a range list that can never be | |
6897 | -- satisfied, since there are no ranges in which the value could lie, | |
6898 | -- so it does not lie in any of them. False_Range is a canonical value | |
6899 | -- for this empty set, but general processing should test for an Rlist | |
6900 | -- with length zero (see Is_False predicate), since other null ranges | |
6901 | -- may appear which must be treated as False. | |
5b5df4a9 | 6902 | |
eb66e842 | 6903 | True_Range : constant RList := RList'(1 => REnt'(BLo, BHi)); |
6904 | -- Range representing True, value must be in the base range | |
5b5df4a9 | 6905 | |
eb66e842 | 6906 | function "and" (Left : RList; Right : RList) return RList; |
6907 | -- And's together two range lists, returning a range list. This is a set | |
6908 | -- intersection operation. | |
5b5df4a9 | 6909 | |
eb66e842 | 6910 | function "or" (Left : RList; Right : RList) return RList; |
6911 | -- Or's together two range lists, returning a range list. This is a set | |
6912 | -- union operation. | |
87f3d5d3 | 6913 | |
eb66e842 | 6914 | function "not" (Right : RList) return RList; |
6915 | -- Returns complement of a given range list, i.e. a range list | |
6916 | -- representing all the values in TLo .. THi that are not in the input | |
6917 | -- operand Right. | |
ed4adc99 | 6918 | |
eb66e842 | 6919 | function Build_Val (V : Uint) return Node_Id; |
6920 | -- Return an analyzed N_Identifier node referencing this value, suitable | |
5c6a5792 | 6921 | -- for use as an entry in the Static_Discrte_Predicate list. This node |
6922 | -- is typed with the base type. | |
5b5df4a9 | 6923 | |
eb66e842 | 6924 | function Build_Range (Lo : Uint; Hi : Uint) return Node_Id; |
6925 | -- Return an analyzed N_Range node referencing this range, suitable for | |
5c6a5792 | 6926 | -- use as an entry in the Static_Discrete_Predicate list. This node is |
6927 | -- typed with the base type. | |
5b5df4a9 | 6928 | |
eb66e842 | 6929 | function Get_RList (Exp : Node_Id) return RList; |
6930 | -- This is a recursive routine that converts the given expression into a | |
6931 | -- list of ranges, suitable for use in building the static predicate. | |
5b5df4a9 | 6932 | |
eb66e842 | 6933 | function Is_False (R : RList) return Boolean; |
6934 | pragma Inline (Is_False); | |
6935 | -- Returns True if the given range list is empty, and thus represents a | |
6936 | -- False list of ranges that can never be satisfied. | |
87f3d5d3 | 6937 | |
eb66e842 | 6938 | function Is_True (R : RList) return Boolean; |
6939 | -- Returns True if R trivially represents the True predicate by having a | |
6940 | -- single range from BLo to BHi. | |
5b5df4a9 | 6941 | |
eb66e842 | 6942 | function Is_Type_Ref (N : Node_Id) return Boolean; |
6943 | pragma Inline (Is_Type_Ref); | |
6944 | -- Returns if True if N is a reference to the type for the predicate in | |
6945 | -- the expression (i.e. if it is an identifier whose Chars field matches | |
7de4cba3 | 6946 | -- the Nam given in the call). N must not be parenthesized, if the type |
6947 | -- name appears in parens, this routine will return False. | |
5b5df4a9 | 6948 | |
eb66e842 | 6949 | function Lo_Val (N : Node_Id) return Uint; |
5c6a5792 | 6950 | -- Given an entry from a Static_Discrete_Predicate list that is either |
6951 | -- a static expression or static range, gets either the expression value | |
6952 | -- or the low bound of the range. | |
5b5df4a9 | 6953 | |
eb66e842 | 6954 | function Hi_Val (N : Node_Id) return Uint; |
5c6a5792 | 6955 | -- Given an entry from a Static_Discrete_Predicate list that is either |
6956 | -- a static expression or static range, gets either the expression value | |
6957 | -- or the high bound of the range. | |
5b5df4a9 | 6958 | |
eb66e842 | 6959 | function Membership_Entry (N : Node_Id) return RList; |
6960 | -- Given a single membership entry (range, value, or subtype), returns | |
6961 | -- the corresponding range list. Raises Static_Error if not static. | |
5b5df4a9 | 6962 | |
eb66e842 | 6963 | function Membership_Entries (N : Node_Id) return RList; |
6964 | -- Given an element on an alternatives list of a membership operation, | |
6965 | -- returns the range list corresponding to this entry and all following | |
6966 | -- entries (i.e. returns the "or" of this list of values). | |
b9e61b2a | 6967 | |
eb66e842 | 6968 | function Stat_Pred (Typ : Entity_Id) return RList; |
6969 | -- Given a type, if it has a static predicate, then return the predicate | |
6970 | -- as a range list, otherwise raise Non_Static. | |
c4968aa2 | 6971 | |
eb66e842 | 6972 | ----------- |
6973 | -- "and" -- | |
6974 | ----------- | |
c4968aa2 | 6975 | |
eb66e842 | 6976 | function "and" (Left : RList; Right : RList) return RList is |
6977 | FEnt : REnt; | |
6978 | -- First range of result | |
c4968aa2 | 6979 | |
eb66e842 | 6980 | SLeft : Nat := Left'First; |
6981 | -- Start of rest of left entries | |
c4968aa2 | 6982 | |
eb66e842 | 6983 | SRight : Nat := Right'First; |
6984 | -- Start of rest of right entries | |
2072eaa9 | 6985 | |
eb66e842 | 6986 | begin |
6987 | -- If either range is True, return the other | |
5b5df4a9 | 6988 | |
eb66e842 | 6989 | if Is_True (Left) then |
6990 | return Right; | |
6991 | elsif Is_True (Right) then | |
6992 | return Left; | |
6993 | end if; | |
87f3d5d3 | 6994 | |
eb66e842 | 6995 | -- If either range is False, return False |
5b5df4a9 | 6996 | |
eb66e842 | 6997 | if Is_False (Left) or else Is_False (Right) then |
6998 | return False_Range; | |
6999 | end if; | |
4c1fd062 | 7000 | |
eb66e842 | 7001 | -- Loop to remove entries at start that are disjoint, and thus just |
7002 | -- get discarded from the result entirely. | |
5b5df4a9 | 7003 | |
eb66e842 | 7004 | loop |
7005 | -- If no operands left in either operand, result is false | |
5b5df4a9 | 7006 | |
eb66e842 | 7007 | if SLeft > Left'Last or else SRight > Right'Last then |
7008 | return False_Range; | |
5b5df4a9 | 7009 | |
eb66e842 | 7010 | -- Discard first left operand entry if disjoint with right |
5b5df4a9 | 7011 | |
eb66e842 | 7012 | elsif Left (SLeft).Hi < Right (SRight).Lo then |
7013 | SLeft := SLeft + 1; | |
5b5df4a9 | 7014 | |
eb66e842 | 7015 | -- Discard first right operand entry if disjoint with left |
5b5df4a9 | 7016 | |
eb66e842 | 7017 | elsif Right (SRight).Hi < Left (SLeft).Lo then |
7018 | SRight := SRight + 1; | |
5b5df4a9 | 7019 | |
eb66e842 | 7020 | -- Otherwise we have an overlapping entry |
5b5df4a9 | 7021 | |
eb66e842 | 7022 | else |
7023 | exit; | |
7024 | end if; | |
7025 | end loop; | |
5b5df4a9 | 7026 | |
eb66e842 | 7027 | -- Now we have two non-null operands, and first entries overlap. The |
7028 | -- first entry in the result will be the overlapping part of these | |
7029 | -- two entries. | |
47a46747 | 7030 | |
eb66e842 | 7031 | FEnt := REnt'(Lo => UI_Max (Left (SLeft).Lo, Right (SRight).Lo), |
7032 | Hi => UI_Min (Left (SLeft).Hi, Right (SRight).Hi)); | |
47a46747 | 7033 | |
eb66e842 | 7034 | -- Now we can remove the entry that ended at a lower value, since its |
7035 | -- contribution is entirely contained in Fent. | |
5b5df4a9 | 7036 | |
eb66e842 | 7037 | if Left (SLeft).Hi <= Right (SRight).Hi then |
7038 | SLeft := SLeft + 1; | |
7039 | else | |
7040 | SRight := SRight + 1; | |
7041 | end if; | |
5b5df4a9 | 7042 | |
eb66e842 | 7043 | -- Compute result by concatenating this first entry with the "and" of |
7044 | -- the remaining parts of the left and right operands. Note that if | |
7045 | -- either of these is empty, "and" will yield empty, so that we will | |
7046 | -- end up with just Fent, which is what we want in that case. | |
5b5df4a9 | 7047 | |
eb66e842 | 7048 | return |
7049 | FEnt & (Left (SLeft .. Left'Last) and Right (SRight .. Right'Last)); | |
7050 | end "and"; | |
fb7f2fc4 | 7051 | |
eb66e842 | 7052 | ----------- |
7053 | -- "not" -- | |
7054 | ----------- | |
fb7f2fc4 | 7055 | |
eb66e842 | 7056 | function "not" (Right : RList) return RList is |
7057 | begin | |
7058 | -- Return True if False range | |
fb7f2fc4 | 7059 | |
eb66e842 | 7060 | if Is_False (Right) then |
7061 | return True_Range; | |
7062 | end if; | |
ed4adc99 | 7063 | |
eb66e842 | 7064 | -- Return False if True range |
fb7f2fc4 | 7065 | |
eb66e842 | 7066 | if Is_True (Right) then |
7067 | return False_Range; | |
7068 | end if; | |
fb7f2fc4 | 7069 | |
eb66e842 | 7070 | -- Here if not trivial case |
87f3d5d3 | 7071 | |
eb66e842 | 7072 | declare |
7073 | Result : RList (1 .. Right'Length + 1); | |
7074 | -- May need one more entry for gap at beginning and end | |
87f3d5d3 | 7075 | |
eb66e842 | 7076 | Count : Nat := 0; |
7077 | -- Number of entries stored in Result | |
4098232e | 7078 | |
eb66e842 | 7079 | begin |
7080 | -- Gap at start | |
4098232e | 7081 | |
eb66e842 | 7082 | if Right (Right'First).Lo > TLo then |
7083 | Count := Count + 1; | |
7084 | Result (Count) := REnt'(TLo, Right (Right'First).Lo - 1); | |
7085 | end if; | |
ed4adc99 | 7086 | |
eb66e842 | 7087 | -- Gaps between ranges |
ed4adc99 | 7088 | |
eb66e842 | 7089 | for J in Right'First .. Right'Last - 1 loop |
7090 | Count := Count + 1; | |
7091 | Result (Count) := REnt'(Right (J).Hi + 1, Right (J + 1).Lo - 1); | |
7092 | end loop; | |
5b5df4a9 | 7093 | |
eb66e842 | 7094 | -- Gap at end |
5b5df4a9 | 7095 | |
eb66e842 | 7096 | if Right (Right'Last).Hi < THi then |
7097 | Count := Count + 1; | |
7098 | Result (Count) := REnt'(Right (Right'Last).Hi + 1, THi); | |
7099 | end if; | |
5b5df4a9 | 7100 | |
eb66e842 | 7101 | return Result (1 .. Count); |
7102 | end; | |
7103 | end "not"; | |
5b5df4a9 | 7104 | |
eb66e842 | 7105 | ---------- |
7106 | -- "or" -- | |
7107 | ---------- | |
5b5df4a9 | 7108 | |
eb66e842 | 7109 | function "or" (Left : RList; Right : RList) return RList is |
7110 | FEnt : REnt; | |
7111 | -- First range of result | |
5b5df4a9 | 7112 | |
eb66e842 | 7113 | SLeft : Nat := Left'First; |
7114 | -- Start of rest of left entries | |
5b5df4a9 | 7115 | |
eb66e842 | 7116 | SRight : Nat := Right'First; |
7117 | -- Start of rest of right entries | |
5b5df4a9 | 7118 | |
eb66e842 | 7119 | begin |
7120 | -- If either range is True, return True | |
5b5df4a9 | 7121 | |
eb66e842 | 7122 | if Is_True (Left) or else Is_True (Right) then |
7123 | return True_Range; | |
7124 | end if; | |
5b5df4a9 | 7125 | |
eb66e842 | 7126 | -- If either range is False (empty), return the other |
5b5df4a9 | 7127 | |
eb66e842 | 7128 | if Is_False (Left) then |
7129 | return Right; | |
7130 | elsif Is_False (Right) then | |
7131 | return Left; | |
7132 | end if; | |
5b5df4a9 | 7133 | |
eb66e842 | 7134 | -- Initialize result first entry from left or right operand depending |
7135 | -- on which starts with the lower range. | |
5b5df4a9 | 7136 | |
eb66e842 | 7137 | if Left (SLeft).Lo < Right (SRight).Lo then |
7138 | FEnt := Left (SLeft); | |
7139 | SLeft := SLeft + 1; | |
7140 | else | |
7141 | FEnt := Right (SRight); | |
7142 | SRight := SRight + 1; | |
7143 | end if; | |
5b5df4a9 | 7144 | |
eb66e842 | 7145 | -- This loop eats ranges from left and right operands that are |
7146 | -- contiguous with the first range we are gathering. | |
9ea61fdd | 7147 | |
eb66e842 | 7148 | loop |
7149 | -- Eat first entry in left operand if contiguous or overlapped by | |
7150 | -- gathered first operand of result. | |
9ea61fdd | 7151 | |
eb66e842 | 7152 | if SLeft <= Left'Last |
7153 | and then Left (SLeft).Lo <= FEnt.Hi + 1 | |
7154 | then | |
7155 | FEnt.Hi := UI_Max (FEnt.Hi, Left (SLeft).Hi); | |
7156 | SLeft := SLeft + 1; | |
9ea61fdd | 7157 | |
eb66e842 | 7158 | -- Eat first entry in right operand if contiguous or overlapped by |
7159 | -- gathered right operand of result. | |
9ea61fdd | 7160 | |
eb66e842 | 7161 | elsif SRight <= Right'Last |
7162 | and then Right (SRight).Lo <= FEnt.Hi + 1 | |
7163 | then | |
7164 | FEnt.Hi := UI_Max (FEnt.Hi, Right (SRight).Hi); | |
7165 | SRight := SRight + 1; | |
9ea61fdd | 7166 | |
eb66e842 | 7167 | -- All done if no more entries to eat |
5b5df4a9 | 7168 | |
eb66e842 | 7169 | else |
7170 | exit; | |
7171 | end if; | |
7172 | end loop; | |
5b5df4a9 | 7173 | |
eb66e842 | 7174 | -- Obtain result as the first entry we just computed, concatenated |
7175 | -- to the "or" of the remaining results (if one operand is empty, | |
7176 | -- this will just concatenate with the other | |
5b5df4a9 | 7177 | |
eb66e842 | 7178 | return |
7179 | FEnt & (Left (SLeft .. Left'Last) or Right (SRight .. Right'Last)); | |
7180 | end "or"; | |
5b5df4a9 | 7181 | |
eb66e842 | 7182 | ----------------- |
7183 | -- Build_Range -- | |
7184 | ----------------- | |
5b5df4a9 | 7185 | |
eb66e842 | 7186 | function Build_Range (Lo : Uint; Hi : Uint) return Node_Id is |
7187 | Result : Node_Id; | |
5b5df4a9 | 7188 | begin |
eb66e842 | 7189 | Result := |
7190 | Make_Range (Loc, | |
7191 | Low_Bound => Build_Val (Lo), | |
7192 | High_Bound => Build_Val (Hi)); | |
7193 | Set_Etype (Result, Btyp); | |
7194 | Set_Analyzed (Result); | |
7195 | return Result; | |
7196 | end Build_Range; | |
5b5df4a9 | 7197 | |
eb66e842 | 7198 | --------------- |
7199 | -- Build_Val -- | |
7200 | --------------- | |
5b5df4a9 | 7201 | |
eb66e842 | 7202 | function Build_Val (V : Uint) return Node_Id is |
7203 | Result : Node_Id; | |
5b5df4a9 | 7204 | |
eb66e842 | 7205 | begin |
7206 | if Is_Enumeration_Type (Typ) then | |
7207 | Result := Get_Enum_Lit_From_Pos (Typ, V, Loc); | |
7208 | else | |
7209 | Result := Make_Integer_Literal (Loc, V); | |
7210 | end if; | |
5b5df4a9 | 7211 | |
eb66e842 | 7212 | Set_Etype (Result, Btyp); |
7213 | Set_Is_Static_Expression (Result); | |
7214 | Set_Analyzed (Result); | |
7215 | return Result; | |
7216 | end Build_Val; | |
87f3d5d3 | 7217 | |
eb66e842 | 7218 | --------------- |
7219 | -- Get_RList -- | |
7220 | --------------- | |
87f3d5d3 | 7221 | |
eb66e842 | 7222 | function Get_RList (Exp : Node_Id) return RList is |
7223 | Op : Node_Kind; | |
7224 | Val : Uint; | |
87f3d5d3 | 7225 | |
eb66e842 | 7226 | begin |
7227 | -- Static expression can only be true or false | |
87f3d5d3 | 7228 | |
eb66e842 | 7229 | if Is_OK_Static_Expression (Exp) then |
7230 | if Expr_Value (Exp) = 0 then | |
7231 | return False_Range; | |
7232 | else | |
7233 | return True_Range; | |
9ea61fdd | 7234 | end if; |
eb66e842 | 7235 | end if; |
87f3d5d3 | 7236 | |
eb66e842 | 7237 | -- Otherwise test node type |
192b8dab | 7238 | |
eb66e842 | 7239 | Op := Nkind (Exp); |
192b8dab | 7240 | |
eb66e842 | 7241 | case Op is |
5d3fb947 | 7242 | |
eb66e842 | 7243 | -- And |
5d3fb947 | 7244 | |
eb66e842 | 7245 | when N_Op_And | N_And_Then => |
7246 | return Get_RList (Left_Opnd (Exp)) | |
7247 | and | |
7248 | Get_RList (Right_Opnd (Exp)); | |
5b5df4a9 | 7249 | |
eb66e842 | 7250 | -- Or |
9dc88aea | 7251 | |
eb66e842 | 7252 | when N_Op_Or | N_Or_Else => |
7253 | return Get_RList (Left_Opnd (Exp)) | |
7254 | or | |
7255 | Get_RList (Right_Opnd (Exp)); | |
7c443ae8 | 7256 | |
eb66e842 | 7257 | -- Not |
9dc88aea | 7258 | |
eb66e842 | 7259 | when N_Op_Not => |
7260 | return not Get_RList (Right_Opnd (Exp)); | |
9dc88aea | 7261 | |
eb66e842 | 7262 | -- Comparisons of type with static value |
84c8f0b8 | 7263 | |
eb66e842 | 7264 | when N_Op_Compare => |
490beba6 | 7265 | |
eb66e842 | 7266 | -- Type is left operand |
9dc88aea | 7267 | |
eb66e842 | 7268 | if Is_Type_Ref (Left_Opnd (Exp)) |
7269 | and then Is_OK_Static_Expression (Right_Opnd (Exp)) | |
7270 | then | |
7271 | Val := Expr_Value (Right_Opnd (Exp)); | |
84c8f0b8 | 7272 | |
eb66e842 | 7273 | -- Typ is right operand |
84c8f0b8 | 7274 | |
eb66e842 | 7275 | elsif Is_Type_Ref (Right_Opnd (Exp)) |
7276 | and then Is_OK_Static_Expression (Left_Opnd (Exp)) | |
7277 | then | |
7278 | Val := Expr_Value (Left_Opnd (Exp)); | |
84c8f0b8 | 7279 | |
eb66e842 | 7280 | -- Invert sense of comparison |
84c8f0b8 | 7281 | |
eb66e842 | 7282 | case Op is |
7283 | when N_Op_Gt => Op := N_Op_Lt; | |
7284 | when N_Op_Lt => Op := N_Op_Gt; | |
7285 | when N_Op_Ge => Op := N_Op_Le; | |
7286 | when N_Op_Le => Op := N_Op_Ge; | |
7287 | when others => null; | |
7288 | end case; | |
84c8f0b8 | 7289 | |
eb66e842 | 7290 | -- Other cases are non-static |
34d045d3 | 7291 | |
eb66e842 | 7292 | else |
7293 | raise Non_Static; | |
7294 | end if; | |
9dc88aea | 7295 | |
eb66e842 | 7296 | -- Construct range according to comparison operation |
9dc88aea | 7297 | |
eb66e842 | 7298 | case Op is |
7299 | when N_Op_Eq => | |
7300 | return RList'(1 => REnt'(Val, Val)); | |
9dc88aea | 7301 | |
eb66e842 | 7302 | when N_Op_Ge => |
7303 | return RList'(1 => REnt'(Val, BHi)); | |
84c8f0b8 | 7304 | |
eb66e842 | 7305 | when N_Op_Gt => |
7306 | return RList'(1 => REnt'(Val + 1, BHi)); | |
84c8f0b8 | 7307 | |
eb66e842 | 7308 | when N_Op_Le => |
7309 | return RList'(1 => REnt'(BLo, Val)); | |
fb7f2fc4 | 7310 | |
eb66e842 | 7311 | when N_Op_Lt => |
7312 | return RList'(1 => REnt'(BLo, Val - 1)); | |
9dc88aea | 7313 | |
eb66e842 | 7314 | when N_Op_Ne => |
7315 | return RList'(REnt'(BLo, Val - 1), REnt'(Val + 1, BHi)); | |
9dc88aea | 7316 | |
eb66e842 | 7317 | when others => |
7318 | raise Program_Error; | |
7319 | end case; | |
9dc88aea | 7320 | |
eb66e842 | 7321 | -- Membership (IN) |
9dc88aea | 7322 | |
eb66e842 | 7323 | when N_In => |
7324 | if not Is_Type_Ref (Left_Opnd (Exp)) then | |
7325 | raise Non_Static; | |
7326 | end if; | |
9dc88aea | 7327 | |
eb66e842 | 7328 | if Present (Right_Opnd (Exp)) then |
7329 | return Membership_Entry (Right_Opnd (Exp)); | |
7330 | else | |
7331 | return Membership_Entries (First (Alternatives (Exp))); | |
7332 | end if; | |
9dc88aea | 7333 | |
eb66e842 | 7334 | -- Negative membership (NOT IN) |
9dc88aea | 7335 | |
eb66e842 | 7336 | when N_Not_In => |
7337 | if not Is_Type_Ref (Left_Opnd (Exp)) then | |
7338 | raise Non_Static; | |
7339 | end if; | |
9dc88aea | 7340 | |
eb66e842 | 7341 | if Present (Right_Opnd (Exp)) then |
7342 | return not Membership_Entry (Right_Opnd (Exp)); | |
7343 | else | |
7344 | return not Membership_Entries (First (Alternatives (Exp))); | |
7345 | end if; | |
9dc88aea | 7346 | |
eb66e842 | 7347 | -- Function call, may be call to static predicate |
9dc88aea | 7348 | |
eb66e842 | 7349 | when N_Function_Call => |
7350 | if Is_Entity_Name (Name (Exp)) then | |
7351 | declare | |
7352 | Ent : constant Entity_Id := Entity (Name (Exp)); | |
7353 | begin | |
7354 | if Is_Predicate_Function (Ent) | |
7355 | or else | |
7356 | Is_Predicate_Function_M (Ent) | |
7357 | then | |
7358 | return Stat_Pred (Etype (First_Formal (Ent))); | |
7359 | end if; | |
7360 | end; | |
7361 | end if; | |
9dc88aea | 7362 | |
eb66e842 | 7363 | -- Other function call cases are non-static |
9dc88aea | 7364 | |
eb66e842 | 7365 | raise Non_Static; |
490beba6 | 7366 | |
eb66e842 | 7367 | -- Qualified expression, dig out the expression |
c92e878b | 7368 | |
eb66e842 | 7369 | when N_Qualified_Expression => |
7370 | return Get_RList (Expression (Exp)); | |
4c1fd062 | 7371 | |
eb66e842 | 7372 | when N_Case_Expression => |
7373 | declare | |
7374 | Alt : Node_Id; | |
7375 | Choices : List_Id; | |
7376 | Dep : Node_Id; | |
4c1fd062 | 7377 | |
eb66e842 | 7378 | begin |
7379 | if not Is_Entity_Name (Expression (Expr)) | |
7380 | or else Etype (Expression (Expr)) /= Typ | |
7381 | then | |
7382 | Error_Msg_N | |
7383 | ("expression must denaote subtype", Expression (Expr)); | |
7384 | return False_Range; | |
7385 | end if; | |
9dc88aea | 7386 | |
eb66e842 | 7387 | -- Collect discrete choices in all True alternatives |
9dc88aea | 7388 | |
eb66e842 | 7389 | Choices := New_List; |
7390 | Alt := First (Alternatives (Exp)); | |
7391 | while Present (Alt) loop | |
7392 | Dep := Expression (Alt); | |
34d045d3 | 7393 | |
cda40848 | 7394 | if not Is_OK_Static_Expression (Dep) then |
eb66e842 | 7395 | raise Non_Static; |
ebbab42d | 7396 | |
eb66e842 | 7397 | elsif Is_True (Expr_Value (Dep)) then |
7398 | Append_List_To (Choices, | |
7399 | New_Copy_List (Discrete_Choices (Alt))); | |
7400 | end if; | |
fb7f2fc4 | 7401 | |
eb66e842 | 7402 | Next (Alt); |
7403 | end loop; | |
9dc88aea | 7404 | |
eb66e842 | 7405 | return Membership_Entries (First (Choices)); |
7406 | end; | |
9dc88aea | 7407 | |
eb66e842 | 7408 | -- Expression with actions: if no actions, dig out expression |
9dc88aea | 7409 | |
eb66e842 | 7410 | when N_Expression_With_Actions => |
7411 | if Is_Empty_List (Actions (Exp)) then | |
7412 | return Get_RList (Expression (Exp)); | |
7413 | else | |
7414 | raise Non_Static; | |
7415 | end if; | |
9dc88aea | 7416 | |
eb66e842 | 7417 | -- Xor operator |
490beba6 | 7418 | |
eb66e842 | 7419 | when N_Op_Xor => |
7420 | return (Get_RList (Left_Opnd (Exp)) | |
7421 | and not Get_RList (Right_Opnd (Exp))) | |
7422 | or (Get_RList (Right_Opnd (Exp)) | |
7423 | and not Get_RList (Left_Opnd (Exp))); | |
9dc88aea | 7424 | |
eb66e842 | 7425 | -- Any other node type is non-static |
fb7f2fc4 | 7426 | |
eb66e842 | 7427 | when others => |
7428 | raise Non_Static; | |
7429 | end case; | |
7430 | end Get_RList; | |
fb7f2fc4 | 7431 | |
eb66e842 | 7432 | ------------ |
7433 | -- Hi_Val -- | |
7434 | ------------ | |
fb7f2fc4 | 7435 | |
eb66e842 | 7436 | function Hi_Val (N : Node_Id) return Uint is |
7437 | begin | |
cda40848 | 7438 | if Is_OK_Static_Expression (N) then |
eb66e842 | 7439 | return Expr_Value (N); |
7440 | else | |
7441 | pragma Assert (Nkind (N) = N_Range); | |
7442 | return Expr_Value (High_Bound (N)); | |
7443 | end if; | |
7444 | end Hi_Val; | |
fb7f2fc4 | 7445 | |
eb66e842 | 7446 | -------------- |
7447 | -- Is_False -- | |
7448 | -------------- | |
fb7f2fc4 | 7449 | |
eb66e842 | 7450 | function Is_False (R : RList) return Boolean is |
7451 | begin | |
7452 | return R'Length = 0; | |
7453 | end Is_False; | |
9dc88aea | 7454 | |
eb66e842 | 7455 | ------------- |
7456 | -- Is_True -- | |
7457 | ------------- | |
9dc88aea | 7458 | |
eb66e842 | 7459 | function Is_True (R : RList) return Boolean is |
7460 | begin | |
7461 | return R'Length = 1 | |
7462 | and then R (R'First).Lo = BLo | |
7463 | and then R (R'First).Hi = BHi; | |
7464 | end Is_True; | |
9dc88aea | 7465 | |
eb66e842 | 7466 | ----------------- |
7467 | -- Is_Type_Ref -- | |
7468 | ----------------- | |
9dc88aea | 7469 | |
eb66e842 | 7470 | function Is_Type_Ref (N : Node_Id) return Boolean is |
7471 | begin | |
7de4cba3 | 7472 | return Nkind (N) = N_Identifier |
7473 | and then Chars (N) = Nam | |
7474 | and then Paren_Count (N) = 0; | |
eb66e842 | 7475 | end Is_Type_Ref; |
9dc88aea | 7476 | |
eb66e842 | 7477 | ------------ |
7478 | -- Lo_Val -- | |
7479 | ------------ | |
9dc88aea | 7480 | |
eb66e842 | 7481 | function Lo_Val (N : Node_Id) return Uint is |
84c8f0b8 | 7482 | begin |
cda40848 | 7483 | if Is_OK_Static_Expression (N) then |
eb66e842 | 7484 | return Expr_Value (N); |
84c8f0b8 | 7485 | else |
eb66e842 | 7486 | pragma Assert (Nkind (N) = N_Range); |
7487 | return Expr_Value (Low_Bound (N)); | |
84c8f0b8 | 7488 | end if; |
eb66e842 | 7489 | end Lo_Val; |
d97beb2f | 7490 | |
eb66e842 | 7491 | ------------------------ |
7492 | -- Membership_Entries -- | |
7493 | ------------------------ | |
d97beb2f | 7494 | |
eb66e842 | 7495 | function Membership_Entries (N : Node_Id) return RList is |
84c8f0b8 | 7496 | begin |
eb66e842 | 7497 | if No (Next (N)) then |
7498 | return Membership_Entry (N); | |
84c8f0b8 | 7499 | else |
eb66e842 | 7500 | return Membership_Entry (N) or Membership_Entries (Next (N)); |
84c8f0b8 | 7501 | end if; |
eb66e842 | 7502 | end Membership_Entries; |
84c8f0b8 | 7503 | |
eb66e842 | 7504 | ---------------------- |
7505 | -- Membership_Entry -- | |
7506 | ---------------------- | |
84c8f0b8 | 7507 | |
eb66e842 | 7508 | function Membership_Entry (N : Node_Id) return RList is |
7509 | Val : Uint; | |
7510 | SLo : Uint; | |
7511 | SHi : Uint; | |
d97beb2f | 7512 | |
eb66e842 | 7513 | begin |
7514 | -- Range case | |
d97beb2f | 7515 | |
eb66e842 | 7516 | if Nkind (N) = N_Range then |
cda40848 | 7517 | if not Is_OK_Static_Expression (Low_Bound (N)) |
eb66e842 | 7518 | or else |
cda40848 | 7519 | not Is_OK_Static_Expression (High_Bound (N)) |
eb66e842 | 7520 | then |
7521 | raise Non_Static; | |
7522 | else | |
7523 | SLo := Expr_Value (Low_Bound (N)); | |
7524 | SHi := Expr_Value (High_Bound (N)); | |
7525 | return RList'(1 => REnt'(SLo, SHi)); | |
7526 | end if; | |
84c8f0b8 | 7527 | |
eb66e842 | 7528 | -- Static expression case |
84c8f0b8 | 7529 | |
cda40848 | 7530 | elsif Is_OK_Static_Expression (N) then |
eb66e842 | 7531 | Val := Expr_Value (N); |
7532 | return RList'(1 => REnt'(Val, Val)); | |
d97beb2f | 7533 | |
eb66e842 | 7534 | -- Identifier (other than static expression) case |
d97beb2f | 7535 | |
eb66e842 | 7536 | else pragma Assert (Nkind (N) = N_Identifier); |
d97beb2f | 7537 | |
eb66e842 | 7538 | -- Type case |
d97beb2f | 7539 | |
eb66e842 | 7540 | if Is_Type (Entity (N)) then |
d97beb2f | 7541 | |
eb66e842 | 7542 | -- If type has predicates, process them |
d97beb2f | 7543 | |
eb66e842 | 7544 | if Has_Predicates (Entity (N)) then |
7545 | return Stat_Pred (Entity (N)); | |
d97beb2f | 7546 | |
eb66e842 | 7547 | -- For static subtype without predicates, get range |
9dc88aea | 7548 | |
cda40848 | 7549 | elsif Is_OK_Static_Subtype (Entity (N)) then |
eb66e842 | 7550 | SLo := Expr_Value (Type_Low_Bound (Entity (N))); |
7551 | SHi := Expr_Value (Type_High_Bound (Entity (N))); | |
7552 | return RList'(1 => REnt'(SLo, SHi)); | |
9f269bd8 | 7553 | |
eb66e842 | 7554 | -- Any other type makes us non-static |
9f269bd8 | 7555 | |
eb66e842 | 7556 | else |
7557 | raise Non_Static; | |
7558 | end if; | |
84c8f0b8 | 7559 | |
eb66e842 | 7560 | -- Any other kind of identifier in predicate (e.g. a non-static |
7561 | -- expression value) means this is not a static predicate. | |
84c8f0b8 | 7562 | |
eb66e842 | 7563 | else |
7564 | raise Non_Static; | |
7565 | end if; | |
7566 | end if; | |
7567 | end Membership_Entry; | |
84c8f0b8 | 7568 | |
eb66e842 | 7569 | --------------- |
7570 | -- Stat_Pred -- | |
7571 | --------------- | |
84c8f0b8 | 7572 | |
eb66e842 | 7573 | function Stat_Pred (Typ : Entity_Id) return RList is |
7574 | begin | |
7575 | -- Not static if type does not have static predicates | |
84c8f0b8 | 7576 | |
5c6a5792 | 7577 | if not Has_Static_Predicate (Typ) then |
eb66e842 | 7578 | raise Non_Static; |
7579 | end if; | |
84c8f0b8 | 7580 | |
eb66e842 | 7581 | -- Otherwise we convert the predicate list to a range list |
84c8f0b8 | 7582 | |
eb66e842 | 7583 | declare |
5c6a5792 | 7584 | Spred : constant List_Id := Static_Discrete_Predicate (Typ); |
7585 | Result : RList (1 .. List_Length (Spred)); | |
eb66e842 | 7586 | P : Node_Id; |
84c8f0b8 | 7587 | |
eb66e842 | 7588 | begin |
5c6a5792 | 7589 | P := First (Static_Discrete_Predicate (Typ)); |
eb66e842 | 7590 | for J in Result'Range loop |
7591 | Result (J) := REnt'(Lo_Val (P), Hi_Val (P)); | |
7592 | Next (P); | |
7593 | end loop; | |
84c8f0b8 | 7594 | |
eb66e842 | 7595 | return Result; |
7596 | end; | |
7597 | end Stat_Pred; | |
84c8f0b8 | 7598 | |
eb66e842 | 7599 | -- Start of processing for Build_Discrete_Static_Predicate |
84c8f0b8 | 7600 | |
eb66e842 | 7601 | begin |
afc229da | 7602 | -- Establish bounds for the predicate |
7603 | ||
7604 | if Compile_Time_Known_Value (Type_Low_Bound (Typ)) then | |
7605 | TLo := Expr_Value (Type_Low_Bound (Typ)); | |
7606 | else | |
7607 | TLo := BLo; | |
7608 | end if; | |
7609 | ||
7610 | if Compile_Time_Known_Value (Type_High_Bound (Typ)) then | |
7611 | THi := Expr_Value (Type_High_Bound (Typ)); | |
7612 | else | |
7613 | THi := BHi; | |
7614 | end if; | |
7615 | ||
eb66e842 | 7616 | -- Analyze the expression to see if it is a static predicate |
84c8f0b8 | 7617 | |
eb66e842 | 7618 | declare |
7619 | Ranges : constant RList := Get_RList (Expr); | |
7620 | -- Range list from expression if it is static | |
84c8f0b8 | 7621 | |
eb66e842 | 7622 | Plist : List_Id; |
84c8f0b8 | 7623 | |
eb66e842 | 7624 | begin |
7625 | -- Convert range list into a form for the static predicate. In the | |
7626 | -- Ranges array, we just have raw ranges, these must be converted | |
7627 | -- to properly typed and analyzed static expressions or range nodes. | |
84c8f0b8 | 7628 | |
eb66e842 | 7629 | -- Note: here we limit ranges to the ranges of the subtype, so that |
7630 | -- a predicate is always false for values outside the subtype. That | |
7631 | -- seems fine, such values are invalid anyway, and considering them | |
7632 | -- to fail the predicate seems allowed and friendly, and furthermore | |
7633 | -- simplifies processing for case statements and loops. | |
84c8f0b8 | 7634 | |
eb66e842 | 7635 | Plist := New_List; |
7636 | ||
7637 | for J in Ranges'Range loop | |
84c8f0b8 | 7638 | declare |
eb66e842 | 7639 | Lo : Uint := Ranges (J).Lo; |
7640 | Hi : Uint := Ranges (J).Hi; | |
84c8f0b8 | 7641 | |
eb66e842 | 7642 | begin |
7643 | -- Ignore completely out of range entry | |
84c8f0b8 | 7644 | |
eb66e842 | 7645 | if Hi < TLo or else Lo > THi then |
7646 | null; | |
84c8f0b8 | 7647 | |
eb66e842 | 7648 | -- Otherwise process entry |
84c8f0b8 | 7649 | |
eb66e842 | 7650 | else |
7651 | -- Adjust out of range value to subtype range | |
490beba6 | 7652 | |
eb66e842 | 7653 | if Lo < TLo then |
7654 | Lo := TLo; | |
7655 | end if; | |
490beba6 | 7656 | |
eb66e842 | 7657 | if Hi > THi then |
7658 | Hi := THi; | |
7659 | end if; | |
84c8f0b8 | 7660 | |
eb66e842 | 7661 | -- Convert range into required form |
84c8f0b8 | 7662 | |
eb66e842 | 7663 | Append_To (Plist, Build_Range (Lo, Hi)); |
84c8f0b8 | 7664 | end if; |
eb66e842 | 7665 | end; |
7666 | end loop; | |
84c8f0b8 | 7667 | |
eb66e842 | 7668 | -- Processing was successful and all entries were static, so now we |
7669 | -- can store the result as the predicate list. | |
84c8f0b8 | 7670 | |
5c6a5792 | 7671 | Set_Static_Discrete_Predicate (Typ, Plist); |
84c8f0b8 | 7672 | |
eb66e842 | 7673 | -- The processing for static predicates put the expression into |
7674 | -- canonical form as a series of ranges. It also eliminated | |
7675 | -- duplicates and collapsed and combined ranges. We might as well | |
7676 | -- replace the alternatives list of the right operand of the | |
7677 | -- membership test with the static predicate list, which will | |
7678 | -- usually be more efficient. | |
84c8f0b8 | 7679 | |
eb66e842 | 7680 | declare |
7681 | New_Alts : constant List_Id := New_List; | |
7682 | Old_Node : Node_Id; | |
7683 | New_Node : Node_Id; | |
84c8f0b8 | 7684 | |
eb66e842 | 7685 | begin |
7686 | Old_Node := First (Plist); | |
7687 | while Present (Old_Node) loop | |
7688 | New_Node := New_Copy (Old_Node); | |
84c8f0b8 | 7689 | |
eb66e842 | 7690 | if Nkind (New_Node) = N_Range then |
7691 | Set_Low_Bound (New_Node, New_Copy (Low_Bound (Old_Node))); | |
7692 | Set_High_Bound (New_Node, New_Copy (High_Bound (Old_Node))); | |
7693 | end if; | |
84c8f0b8 | 7694 | |
eb66e842 | 7695 | Append_To (New_Alts, New_Node); |
7696 | Next (Old_Node); | |
7697 | end loop; | |
84c8f0b8 | 7698 | |
eb66e842 | 7699 | -- If empty list, replace by False |
84c8f0b8 | 7700 | |
eb66e842 | 7701 | if Is_Empty_List (New_Alts) then |
7702 | Rewrite (Expr, New_Occurrence_Of (Standard_False, Loc)); | |
84c8f0b8 | 7703 | |
eb66e842 | 7704 | -- Else replace by set membership test |
84c8f0b8 | 7705 | |
eb66e842 | 7706 | else |
7707 | Rewrite (Expr, | |
7708 | Make_In (Loc, | |
7709 | Left_Opnd => Make_Identifier (Loc, Nam), | |
7710 | Right_Opnd => Empty, | |
7711 | Alternatives => New_Alts)); | |
490beba6 | 7712 | |
eb66e842 | 7713 | -- Resolve new expression in function context |
490beba6 | 7714 | |
eb66e842 | 7715 | Install_Formals (Predicate_Function (Typ)); |
7716 | Push_Scope (Predicate_Function (Typ)); | |
7717 | Analyze_And_Resolve (Expr, Standard_Boolean); | |
7718 | Pop_Scope; | |
7719 | end if; | |
7720 | end; | |
7721 | end; | |
9ab32fe9 | 7722 | |
eb66e842 | 7723 | -- If non-static, return doing nothing |
9ab32fe9 | 7724 | |
eb66e842 | 7725 | exception |
7726 | when Non_Static => | |
7727 | return; | |
7728 | end Build_Discrete_Static_Predicate; | |
64cc9e5d | 7729 | |
eb66e842 | 7730 | ------------------------------------------- |
7731 | -- Build_Invariant_Procedure_Declaration -- | |
7732 | ------------------------------------------- | |
9ab32fe9 | 7733 | |
eb66e842 | 7734 | function Build_Invariant_Procedure_Declaration |
7735 | (Typ : Entity_Id) return Node_Id | |
7736 | is | |
7737 | Loc : constant Source_Ptr := Sloc (Typ); | |
7738 | Object_Entity : constant Entity_Id := | |
7739 | Make_Defining_Identifier (Loc, New_Internal_Name ('I')); | |
7740 | Spec : Node_Id; | |
7741 | SId : Entity_Id; | |
9ab32fe9 | 7742 | |
eb66e842 | 7743 | begin |
7744 | Set_Etype (Object_Entity, Typ); | |
7745 | ||
7746 | -- Check for duplicate definiations. | |
7747 | ||
7748 | if Has_Invariants (Typ) and then Present (Invariant_Procedure (Typ)) then | |
7749 | return Empty; | |
d97beb2f | 7750 | end if; |
d97beb2f | 7751 | |
eb66e842 | 7752 | SId := |
7753 | Make_Defining_Identifier (Loc, | |
7754 | Chars => New_External_Name (Chars (Typ), "Invariant")); | |
7755 | Set_Has_Invariants (Typ); | |
7756 | Set_Ekind (SId, E_Procedure); | |
856a9917 | 7757 | Set_Etype (SId, Standard_Void_Type); |
eb66e842 | 7758 | Set_Is_Invariant_Procedure (SId); |
7759 | Set_Invariant_Procedure (Typ, SId); | |
d97beb2f | 7760 | |
eb66e842 | 7761 | Spec := |
7762 | Make_Procedure_Specification (Loc, | |
7763 | Defining_Unit_Name => SId, | |
7764 | Parameter_Specifications => New_List ( | |
7765 | Make_Parameter_Specification (Loc, | |
7766 | Defining_Identifier => Object_Entity, | |
7767 | Parameter_Type => New_Occurrence_Of (Typ, Loc)))); | |
d97beb2f | 7768 | |
eb66e842 | 7769 | return Make_Subprogram_Declaration (Loc, Specification => Spec); |
7770 | end Build_Invariant_Procedure_Declaration; | |
7771 | ||
7772 | ------------------------------- | |
7773 | -- Build_Invariant_Procedure -- | |
7774 | ------------------------------- | |
7775 | ||
7776 | -- The procedure that is constructed here has the form | |
7777 | ||
7778 | -- procedure typInvariant (Ixxx : typ) is | |
7779 | -- begin | |
7780 | -- pragma Check (Invariant, exp, "failed invariant from xxx"); | |
7781 | -- pragma Check (Invariant, exp, "failed invariant from xxx"); | |
7782 | -- ... | |
7783 | -- pragma Check (Invariant, exp, "failed inherited invariant from xxx"); | |
7784 | -- ... | |
7785 | -- end typInvariant; | |
7786 | ||
7787 | procedure Build_Invariant_Procedure (Typ : Entity_Id; N : Node_Id) is | |
7788 | Loc : constant Source_Ptr := Sloc (Typ); | |
7789 | Stmts : List_Id; | |
7790 | Spec : Node_Id; | |
7791 | SId : Entity_Id; | |
7792 | PDecl : Node_Id; | |
7793 | PBody : Node_Id; | |
d97beb2f | 7794 | |
eb66e842 | 7795 | Nam : Name_Id; |
7796 | -- Name for Check pragma, usually Invariant, but might be Type_Invariant | |
7797 | -- if we come from a Type_Invariant aspect, we make sure to build the | |
7798 | -- Check pragma with the right name, so that Check_Policy works right. | |
d7c2851f | 7799 | |
eb66e842 | 7800 | Visible_Decls : constant List_Id := Visible_Declarations (N); |
7801 | Private_Decls : constant List_Id := Private_Declarations (N); | |
d7c2851f | 7802 | |
eb66e842 | 7803 | procedure Add_Invariants (T : Entity_Id; Inherit : Boolean); |
7804 | -- Appends statements to Stmts for any invariants in the rep item chain | |
7805 | -- of the given type. If Inherit is False, then we only process entries | |
7806 | -- on the chain for the type Typ. If Inherit is True, then we ignore any | |
7807 | -- Invariant aspects, but we process all Invariant'Class aspects, adding | |
7808 | -- "inherited" to the exception message and generating an informational | |
7809 | -- message about the inheritance of an invariant. | |
d97beb2f | 7810 | |
eb66e842 | 7811 | Object_Name : Name_Id; |
7812 | -- Name for argument of invariant procedure | |
d97beb2f | 7813 | |
eb66e842 | 7814 | Object_Entity : Node_Id; |
7815 | -- The entity of the formal for the procedure | |
d97beb2f | 7816 | |
eb66e842 | 7817 | -------------------- |
7818 | -- Add_Invariants -- | |
7819 | -------------------- | |
d97beb2f | 7820 | |
eb66e842 | 7821 | procedure Add_Invariants (T : Entity_Id; Inherit : Boolean) is |
7822 | Ritem : Node_Id; | |
7823 | Arg1 : Node_Id; | |
7824 | Arg2 : Node_Id; | |
7825 | Arg3 : Node_Id; | |
7826 | Exp : Node_Id; | |
7827 | Loc : Source_Ptr; | |
7828 | Assoc : List_Id; | |
7829 | Str : String_Id; | |
d97beb2f | 7830 | |
eb66e842 | 7831 | procedure Replace_Type_Reference (N : Node_Id); |
7832 | -- Replace a single occurrence N of the subtype name with a reference | |
7833 | -- to the formal of the predicate function. N can be an identifier | |
7834 | -- referencing the subtype, or a selected component, representing an | |
7835 | -- appropriately qualified occurrence of the subtype name. | |
d97beb2f | 7836 | |
eb66e842 | 7837 | procedure Replace_Type_References is |
7838 | new Replace_Type_References_Generic (Replace_Type_Reference); | |
7839 | -- Traverse an expression replacing all occurrences of the subtype | |
7840 | -- name with appropriate references to the object that is the formal | |
7841 | -- parameter of the predicate function. Note that we must ensure | |
7842 | -- that the type and entity information is properly set in the | |
7843 | -- replacement node, since we will do a Preanalyze call of this | |
7844 | -- expression without proper visibility of the procedure argument. | |
d97beb2f | 7845 | |
eb66e842 | 7846 | ---------------------------- |
7847 | -- Replace_Type_Reference -- | |
7848 | ---------------------------- | |
d97beb2f | 7849 | |
eb66e842 | 7850 | -- Note: See comments in Add_Predicates.Replace_Type_Reference |
7851 | -- regarding handling of Sloc and Comes_From_Source. | |
d97beb2f | 7852 | |
eb66e842 | 7853 | procedure Replace_Type_Reference (N : Node_Id) is |
7854 | begin | |
d97beb2f | 7855 | |
eb66e842 | 7856 | -- Add semantic information to node to be rewritten, for ASIS |
7857 | -- navigation needs. | |
d97beb2f | 7858 | |
eb66e842 | 7859 | if Nkind (N) = N_Identifier then |
7860 | Set_Entity (N, T); | |
7861 | Set_Etype (N, T); | |
d7c2851f | 7862 | |
eb66e842 | 7863 | elsif Nkind (N) = N_Selected_Component then |
7864 | Analyze (Prefix (N)); | |
7865 | Set_Entity (Selector_Name (N), T); | |
7866 | Set_Etype (Selector_Name (N), T); | |
7867 | end if; | |
d7c2851f | 7868 | |
eb66e842 | 7869 | -- Invariant'Class, replace with T'Class (obj) |
69004fe6 | 7870 | -- In ASIS mode, an inherited item is analyzed already, and the |
7871 | -- replacement has been done, so do not repeat transformation | |
7872 | -- to prevent ill-formed tree. | |
d97beb2f | 7873 | |
eb66e842 | 7874 | if Class_Present (Ritem) then |
69004fe6 | 7875 | if ASIS_Mode |
7876 | and then Nkind (Parent (N)) = N_Attribute_Reference | |
7877 | and then Attribute_Name (Parent (N)) = Name_Class | |
7878 | then | |
7879 | null; | |
7880 | ||
7881 | else | |
7882 | Rewrite (N, | |
7883 | Make_Type_Conversion (Sloc (N), | |
7884 | Subtype_Mark => | |
7885 | Make_Attribute_Reference (Sloc (N), | |
7886 | Prefix => New_Occurrence_Of (T, Sloc (N)), | |
7887 | Attribute_Name => Name_Class), | |
7888 | Expression => | |
7889 | Make_Identifier (Sloc (N), Object_Name))); | |
7890 | ||
7891 | Set_Entity (Expression (N), Object_Entity); | |
7892 | Set_Etype (Expression (N), Typ); | |
7893 | end if; | |
d9f6a4ee | 7894 | |
eb66e842 | 7895 | -- Invariant, replace with obj |
d9f6a4ee | 7896 | |
eb66e842 | 7897 | else |
7898 | Rewrite (N, Make_Identifier (Sloc (N), Object_Name)); | |
7899 | Set_Entity (N, Object_Entity); | |
7900 | Set_Etype (N, Typ); | |
7901 | end if; | |
d9f6a4ee | 7902 | |
eb66e842 | 7903 | Set_Comes_From_Source (N, True); |
7904 | end Replace_Type_Reference; | |
d9f6a4ee | 7905 | |
eb66e842 | 7906 | -- Start of processing for Add_Invariants |
d9f6a4ee | 7907 | |
eb66e842 | 7908 | begin |
7909 | Ritem := First_Rep_Item (T); | |
7910 | while Present (Ritem) loop | |
7911 | if Nkind (Ritem) = N_Pragma | |
7912 | and then Pragma_Name (Ritem) = Name_Invariant | |
7913 | then | |
7914 | Arg1 := First (Pragma_Argument_Associations (Ritem)); | |
7915 | Arg2 := Next (Arg1); | |
7916 | Arg3 := Next (Arg2); | |
d9f6a4ee | 7917 | |
eb66e842 | 7918 | Arg1 := Get_Pragma_Arg (Arg1); |
7919 | Arg2 := Get_Pragma_Arg (Arg2); | |
d9f6a4ee | 7920 | |
eb66e842 | 7921 | -- For Inherit case, ignore Invariant, process only Class case |
d9f6a4ee | 7922 | |
eb66e842 | 7923 | if Inherit then |
7924 | if not Class_Present (Ritem) then | |
7925 | goto Continue; | |
7926 | end if; | |
d9f6a4ee | 7927 | |
eb66e842 | 7928 | -- For Inherit false, process only item for right type |
d9f6a4ee | 7929 | |
eb66e842 | 7930 | else |
7931 | if Entity (Arg1) /= Typ then | |
7932 | goto Continue; | |
7933 | end if; | |
7934 | end if; | |
d9f6a4ee | 7935 | |
eb66e842 | 7936 | if No (Stmts) then |
7937 | Stmts := Empty_List; | |
7938 | end if; | |
d9f6a4ee | 7939 | |
eb66e842 | 7940 | Exp := New_Copy_Tree (Arg2); |
d9f6a4ee | 7941 | |
eb66e842 | 7942 | -- Preserve sloc of original pragma Invariant |
d9f6a4ee | 7943 | |
eb66e842 | 7944 | Loc := Sloc (Ritem); |
d9f6a4ee | 7945 | |
eb66e842 | 7946 | -- We need to replace any occurrences of the name of the type |
7947 | -- with references to the object, converted to type'Class in | |
7948 | -- the case of Invariant'Class aspects. | |
d9f6a4ee | 7949 | |
37c6552c | 7950 | Replace_Type_References (Exp, T); |
d9f6a4ee | 7951 | |
eb66e842 | 7952 | -- If this invariant comes from an aspect, find the aspect |
7953 | -- specification, and replace the saved expression because | |
7954 | -- we need the subtype references replaced for the calls to | |
7955 | -- Preanalyze_Spec_Expressin in Check_Aspect_At_Freeze_Point | |
7956 | -- and Check_Aspect_At_End_Of_Declarations. | |
d9f6a4ee | 7957 | |
eb66e842 | 7958 | if From_Aspect_Specification (Ritem) then |
7959 | declare | |
7960 | Aitem : Node_Id; | |
d9f6a4ee | 7961 | |
eb66e842 | 7962 | begin |
7963 | -- Loop to find corresponding aspect, note that this | |
7964 | -- must be present given the pragma is marked delayed. | |
d9f6a4ee | 7965 | |
eb66e842 | 7966 | -- Note: in practice Next_Rep_Item (Ritem) is Empty so |
7967 | -- this loop does nothing. Furthermore, why isn't this | |
7968 | -- simply Corresponding_Aspect ??? | |
d9f6a4ee | 7969 | |
eb66e842 | 7970 | Aitem := Next_Rep_Item (Ritem); |
7971 | while Present (Aitem) loop | |
7972 | if Nkind (Aitem) = N_Aspect_Specification | |
7973 | and then Aspect_Rep_Item (Aitem) = Ritem | |
7974 | then | |
7975 | Set_Entity | |
7976 | (Identifier (Aitem), New_Copy_Tree (Exp)); | |
7977 | exit; | |
7978 | end if; | |
d9f6a4ee | 7979 | |
eb66e842 | 7980 | Aitem := Next_Rep_Item (Aitem); |
7981 | end loop; | |
7982 | end; | |
7983 | end if; | |
d9f6a4ee | 7984 | |
eb66e842 | 7985 | -- Now we need to preanalyze the expression to properly capture |
7986 | -- the visibility in the visible part. The expression will not | |
7987 | -- be analyzed for real until the body is analyzed, but that is | |
7988 | -- at the end of the private part and has the wrong visibility. | |
d9f6a4ee | 7989 | |
eb66e842 | 7990 | Set_Parent (Exp, N); |
31831d39 | 7991 | Preanalyze_Assert_Expression (Exp, Any_Boolean); |
d9f6a4ee | 7992 | |
f02a9a9a | 7993 | -- A class-wide invariant may be inherited in a separate unit, |
7994 | -- where the corresponding expression cannot be resolved by | |
7995 | -- visibility, because it refers to a local function. Propagate | |
7996 | -- semantic information to the original representation item, to | |
7997 | -- be used when an invariant procedure for a derived type is | |
7998 | -- constructed. | |
7999 | ||
8000 | -- Unclear how to handle class-wide invariants that are not | |
8001 | -- function calls ??? | |
8002 | ||
8003 | if not Inherit | |
8004 | and then Class_Present (Ritem) | |
8005 | and then Nkind (Exp) = N_Function_Call | |
8006 | and then Nkind (Arg2) = N_Indexed_Component | |
8007 | then | |
8008 | Rewrite (Arg2, | |
8009 | Make_Function_Call (Loc, | |
8010 | Name => | |
8011 | New_Occurrence_Of (Entity (Name (Exp)), Loc), | |
8012 | Parameter_Associations => | |
8013 | New_Copy_List (Expressions (Arg2)))); | |
8014 | end if; | |
8015 | ||
eb66e842 | 8016 | -- In ASIS mode, even if assertions are not enabled, we must |
8017 | -- analyze the original expression in the aspect specification | |
8018 | -- because it is part of the original tree. | |
d9f6a4ee | 8019 | |
eb66e842 | 8020 | if ASIS_Mode and then From_Aspect_Specification (Ritem) then |
8021 | declare | |
8022 | Inv : constant Node_Id := | |
8023 | Expression (Corresponding_Aspect (Ritem)); | |
8024 | begin | |
37c6552c | 8025 | Replace_Type_References (Inv, T); |
eb66e842 | 8026 | Preanalyze_Assert_Expression (Inv, Standard_Boolean); |
8027 | end; | |
8028 | end if; | |
d9f6a4ee | 8029 | |
eb66e842 | 8030 | -- Get name to be used for Check pragma |
d9f6a4ee | 8031 | |
eb66e842 | 8032 | if not From_Aspect_Specification (Ritem) then |
8033 | Nam := Name_Invariant; | |
8034 | else | |
8035 | Nam := Chars (Identifier (Corresponding_Aspect (Ritem))); | |
8036 | end if; | |
d9f6a4ee | 8037 | |
eb66e842 | 8038 | -- Build first two arguments for Check pragma |
d9f6a4ee | 8039 | |
eb66e842 | 8040 | Assoc := |
8041 | New_List ( | |
8042 | Make_Pragma_Argument_Association (Loc, | |
8043 | Expression => Make_Identifier (Loc, Chars => Nam)), | |
8044 | Make_Pragma_Argument_Association (Loc, | |
8045 | Expression => Exp)); | |
d9f6a4ee | 8046 | |
eb66e842 | 8047 | -- Add message if present in Invariant pragma |
d9f6a4ee | 8048 | |
eb66e842 | 8049 | if Present (Arg3) then |
8050 | Str := Strval (Get_Pragma_Arg (Arg3)); | |
d9f6a4ee | 8051 | |
eb66e842 | 8052 | -- If inherited case, and message starts "failed invariant", |
8053 | -- change it to be "failed inherited invariant". | |
d9f6a4ee | 8054 | |
eb66e842 | 8055 | if Inherit then |
8056 | String_To_Name_Buffer (Str); | |
d9f6a4ee | 8057 | |
eb66e842 | 8058 | if Name_Buffer (1 .. 16) = "failed invariant" then |
8059 | Insert_Str_In_Name_Buffer ("inherited ", 8); | |
8060 | Str := String_From_Name_Buffer; | |
8061 | end if; | |
8062 | end if; | |
d9f6a4ee | 8063 | |
eb66e842 | 8064 | Append_To (Assoc, |
8065 | Make_Pragma_Argument_Association (Loc, | |
8066 | Expression => Make_String_Literal (Loc, Str))); | |
8067 | end if; | |
d9f6a4ee | 8068 | |
eb66e842 | 8069 | -- Add Check pragma to list of statements |
d97beb2f | 8070 | |
eb66e842 | 8071 | Append_To (Stmts, |
8072 | Make_Pragma (Loc, | |
8073 | Pragma_Identifier => | |
8074 | Make_Identifier (Loc, Name_Check), | |
8075 | Pragma_Argument_Associations => Assoc)); | |
d97beb2f | 8076 | |
eb66e842 | 8077 | -- If Inherited case and option enabled, output info msg. Note |
8078 | -- that we know this is a case of Invariant'Class. | |
d97beb2f | 8079 | |
eb66e842 | 8080 | if Inherit and Opt.List_Inherited_Aspects then |
8081 | Error_Msg_Sloc := Sloc (Ritem); | |
8082 | Error_Msg_N | |
8083 | ("info: & inherits `Invariant''Class` aspect from #?L?", | |
8084 | Typ); | |
8085 | end if; | |
d9f6a4ee | 8086 | end if; |
d97beb2f | 8087 | |
eb66e842 | 8088 | <<Continue>> |
8089 | Next_Rep_Item (Ritem); | |
8090 | end loop; | |
8091 | end Add_Invariants; | |
d97beb2f | 8092 | |
eb66e842 | 8093 | -- Start of processing for Build_Invariant_Procedure |
d97beb2f | 8094 | |
eb66e842 | 8095 | begin |
8096 | Stmts := No_List; | |
8097 | PDecl := Empty; | |
8098 | PBody := Empty; | |
8099 | SId := Empty; | |
d97beb2f | 8100 | |
eb66e842 | 8101 | -- If the aspect specification exists for some view of the type, the |
8102 | -- declaration for the procedure has been created. | |
d97beb2f | 8103 | |
eb66e842 | 8104 | if Has_Invariants (Typ) then |
8105 | SId := Invariant_Procedure (Typ); | |
8106 | end if; | |
9dc88aea | 8107 | |
0c2bde47 | 8108 | -- If the body is already present, nothing to do. This will occur when |
8109 | -- the type is already frozen, which is the case when the invariant | |
8110 | -- appears in a private part, and the freezing takes place before the | |
8111 | -- final pass over full declarations. | |
aba11c12 | 8112 | |
8113 | -- See Exp_Ch3.Insert_Component_Invariant_Checks for details. | |
0c2bde47 | 8114 | |
eb66e842 | 8115 | if Present (SId) then |
8116 | PDecl := Unit_Declaration_Node (SId); | |
0c2bde47 | 8117 | |
8118 | if Present (PDecl) | |
8119 | and then Nkind (PDecl) = N_Subprogram_Declaration | |
8120 | and then Present (Corresponding_Body (PDecl)) | |
8121 | then | |
8122 | return; | |
8123 | end if; | |
8124 | ||
eb66e842 | 8125 | else |
8126 | PDecl := Build_Invariant_Procedure_Declaration (Typ); | |
8127 | end if; | |
9dc88aea | 8128 | |
eb66e842 | 8129 | -- Recover formal of procedure, for use in the calls to invariant |
8130 | -- functions (including inherited ones). | |
d9f6a4ee | 8131 | |
eb66e842 | 8132 | Object_Entity := |
8133 | Defining_Identifier | |
8134 | (First (Parameter_Specifications (Specification (PDecl)))); | |
8135 | Object_Name := Chars (Object_Entity); | |
d9f6a4ee | 8136 | |
eb66e842 | 8137 | -- Add invariants for the current type |
9dc88aea | 8138 | |
eb66e842 | 8139 | Add_Invariants (Typ, Inherit => False); |
9dc88aea | 8140 | |
eb66e842 | 8141 | -- Add invariants for parent types |
9dc88aea | 8142 | |
eb66e842 | 8143 | declare |
8144 | Current_Typ : Entity_Id; | |
8145 | Parent_Typ : Entity_Id; | |
9dc88aea | 8146 | |
eb66e842 | 8147 | begin |
8148 | Current_Typ := Typ; | |
d97beb2f | 8149 | loop |
eb66e842 | 8150 | Parent_Typ := Etype (Current_Typ); |
9dc88aea | 8151 | |
eb66e842 | 8152 | if Is_Private_Type (Parent_Typ) |
8153 | and then Present (Full_View (Base_Type (Parent_Typ))) | |
d9f6a4ee | 8154 | then |
eb66e842 | 8155 | Parent_Typ := Full_View (Base_Type (Parent_Typ)); |
8156 | end if; | |
9dc88aea | 8157 | |
eb66e842 | 8158 | exit when Parent_Typ = Current_Typ; |
9dc88aea | 8159 | |
eb66e842 | 8160 | Current_Typ := Parent_Typ; |
8161 | Add_Invariants (Current_Typ, Inherit => True); | |
8162 | end loop; | |
8163 | end; | |
ad274a73 | 8164 | |
8165 | -- Add invariants of progenitors | |
8166 | ||
8167 | if Is_Tagged_Type (Typ) and then not Is_Interface (Typ) then | |
8168 | declare | |
8169 | Ifaces_List : Elist_Id; | |
8170 | AI : Elmt_Id; | |
8171 | Iface : Entity_Id; | |
8172 | ||
8173 | begin | |
8174 | Collect_Interfaces (Typ, Ifaces_List); | |
8175 | ||
8176 | AI := First_Elmt (Ifaces_List); | |
8177 | while Present (AI) loop | |
8178 | Iface := Node (AI); | |
8179 | ||
8180 | if not Is_Ancestor (Iface, Typ, Use_Full_View => True) then | |
8181 | Add_Invariants (Iface, Inherit => True); | |
8182 | end if; | |
8183 | ||
8184 | Next_Elmt (AI); | |
8185 | end loop; | |
8186 | end; | |
8187 | end if; | |
9dc88aea | 8188 | |
eb66e842 | 8189 | -- Build the procedure if we generated at least one Check pragma |
9dc88aea | 8190 | |
eb66e842 | 8191 | if Stmts /= No_List then |
8192 | Spec := Copy_Separate_Tree (Specification (PDecl)); | |
9dc88aea | 8193 | |
eb66e842 | 8194 | PBody := |
8195 | Make_Subprogram_Body (Loc, | |
8196 | Specification => Spec, | |
8197 | Declarations => Empty_List, | |
8198 | Handled_Statement_Sequence => | |
8199 | Make_Handled_Sequence_Of_Statements (Loc, | |
8200 | Statements => Stmts)); | |
9dc88aea | 8201 | |
eb66e842 | 8202 | -- Insert procedure declaration and spec at the appropriate points. |
8203 | -- If declaration is already analyzed, it was processed by the | |
8204 | -- generated pragma. | |
9dc88aea | 8205 | |
eb66e842 | 8206 | if Present (Private_Decls) then |
d97beb2f | 8207 | |
eb66e842 | 8208 | -- The spec goes at the end of visible declarations, but they have |
8209 | -- already been analyzed, so we need to explicitly do the analyze. | |
d9f6a4ee | 8210 | |
eb66e842 | 8211 | if not Analyzed (PDecl) then |
8212 | Append_To (Visible_Decls, PDecl); | |
8213 | Analyze (PDecl); | |
8214 | end if; | |
d9f6a4ee | 8215 | |
eb66e842 | 8216 | -- The body goes at the end of the private declarations, which we |
8217 | -- have not analyzed yet, so we do not need to perform an explicit | |
8218 | -- analyze call. We skip this if there are no private declarations | |
8219 | -- (this is an error that will be caught elsewhere); | |
d9f6a4ee | 8220 | |
eb66e842 | 8221 | Append_To (Private_Decls, PBody); |
d9f6a4ee | 8222 | |
eb66e842 | 8223 | -- If the invariant appears on the full view of a type, the |
8224 | -- analysis of the private part is complete, and we must | |
8225 | -- analyze the new body explicitly. | |
d9f6a4ee | 8226 | |
eb66e842 | 8227 | if In_Private_Part (Current_Scope) then |
8228 | Analyze (PBody); | |
8229 | end if; | |
d97beb2f | 8230 | |
eb66e842 | 8231 | -- If there are no private declarations this may be an error that |
8232 | -- will be diagnosed elsewhere. However, if this is a non-private | |
8233 | -- type that inherits invariants, it needs no completion and there | |
8234 | -- may be no private part. In this case insert invariant procedure | |
8235 | -- at end of current declarative list, and analyze at once, given | |
8236 | -- that the type is about to be frozen. | |
d97beb2f | 8237 | |
eb66e842 | 8238 | elsif not Is_Private_Type (Typ) then |
8239 | Append_To (Visible_Decls, PDecl); | |
8240 | Append_To (Visible_Decls, PBody); | |
8241 | Analyze (PDecl); | |
8242 | Analyze (PBody); | |
8243 | end if; | |
8244 | end if; | |
8245 | end Build_Invariant_Procedure; | |
d9f6a4ee | 8246 | |
eb66e842 | 8247 | ------------------------------- |
8248 | -- Build_Predicate_Functions -- | |
8249 | ------------------------------- | |
d9f6a4ee | 8250 | |
eb66e842 | 8251 | -- The procedures that are constructed here have the form: |
d9f6a4ee | 8252 | |
eb66e842 | 8253 | -- function typPredicate (Ixxx : typ) return Boolean is |
8254 | -- begin | |
8255 | -- return | |
8256 | -- exp1 and then exp2 and then ... | |
8257 | -- and then typ1Predicate (typ1 (Ixxx)) | |
8258 | -- and then typ2Predicate (typ2 (Ixxx)) | |
8259 | -- and then ...; | |
8260 | -- end typPredicate; | |
d9f6a4ee | 8261 | |
eb66e842 | 8262 | -- Here exp1, and exp2 are expressions from Predicate pragmas. Note that |
8263 | -- this is the point at which these expressions get analyzed, providing the | |
8264 | -- required delay, and typ1, typ2, are entities from which predicates are | |
8265 | -- inherited. Note that we do NOT generate Check pragmas, that's because we | |
8266 | -- use this function even if checks are off, e.g. for membership tests. | |
d9f6a4ee | 8267 | |
eb66e842 | 8268 | -- If the expression has at least one Raise_Expression, then we also build |
8269 | -- the typPredicateM version of the function, in which any occurrence of a | |
8270 | -- Raise_Expression is converted to "return False". | |
d9f6a4ee | 8271 | |
eb66e842 | 8272 | procedure Build_Predicate_Functions (Typ : Entity_Id; N : Node_Id) is |
8273 | Loc : constant Source_Ptr := Sloc (Typ); | |
d9f6a4ee | 8274 | |
eb66e842 | 8275 | Expr : Node_Id; |
8276 | -- This is the expression for the result of the function. It is | |
8277 | -- is build by connecting the component predicates with AND THEN. | |
d9f6a4ee | 8278 | |
eb66e842 | 8279 | Expr_M : Node_Id; |
8280 | -- This is the corresponding return expression for the Predicate_M | |
8281 | -- function. It differs in that raise expressions are marked for | |
8282 | -- special expansion (see Process_REs). | |
d9f6a4ee | 8283 | |
eb66e842 | 8284 | Object_Name : constant Name_Id := New_Internal_Name ('I'); |
8285 | -- Name for argument of Predicate procedure. Note that we use the same | |
499918a7 | 8286 | -- name for both predicate functions. That way the reference within the |
eb66e842 | 8287 | -- predicate expression is the same in both functions. |
d9f6a4ee | 8288 | |
eb66e842 | 8289 | Object_Entity : constant Entity_Id := |
8290 | Make_Defining_Identifier (Loc, Chars => Object_Name); | |
8291 | -- Entity for argument of Predicate procedure | |
d9f6a4ee | 8292 | |
eb66e842 | 8293 | Object_Entity_M : constant Entity_Id := |
8294 | Make_Defining_Identifier (Loc, Chars => Object_Name); | |
8295 | -- Entity for argument of Predicate_M procedure | |
d9f6a4ee | 8296 | |
eb66e842 | 8297 | Raise_Expression_Present : Boolean := False; |
8298 | -- Set True if Expr has at least one Raise_Expression | |
d9f6a4ee | 8299 | |
eb66e842 | 8300 | procedure Add_Call (T : Entity_Id); |
8301 | -- Includes a call to the predicate function for type T in Expr if T | |
8302 | -- has predicates and Predicate_Function (T) is non-empty. | |
d9f6a4ee | 8303 | |
eb66e842 | 8304 | procedure Add_Predicates; |
8305 | -- Appends expressions for any Predicate pragmas in the rep item chain | |
8306 | -- Typ to Expr. Note that we look only at items for this exact entity. | |
8307 | -- Inheritance of predicates for the parent type is done by calling the | |
8308 | -- Predicate_Function of the parent type, using Add_Call above. | |
d9f6a4ee | 8309 | |
eb66e842 | 8310 | function Test_RE (N : Node_Id) return Traverse_Result; |
8311 | -- Used in Test_REs, tests one node for being a raise expression, and if | |
8312 | -- so sets Raise_Expression_Present True. | |
d9f6a4ee | 8313 | |
eb66e842 | 8314 | procedure Test_REs is new Traverse_Proc (Test_RE); |
8315 | -- Tests to see if Expr contains any raise expressions | |
d9f6a4ee | 8316 | |
eb66e842 | 8317 | function Process_RE (N : Node_Id) return Traverse_Result; |
8318 | -- Used in Process REs, tests if node N is a raise expression, and if | |
8319 | -- so, marks it to be converted to return False. | |
d9f6a4ee | 8320 | |
eb66e842 | 8321 | procedure Process_REs is new Traverse_Proc (Process_RE); |
8322 | -- Marks any raise expressions in Expr_M to return False | |
d9f6a4ee | 8323 | |
eb66e842 | 8324 | -------------- |
8325 | -- Add_Call -- | |
8326 | -------------- | |
d9f6a4ee | 8327 | |
eb66e842 | 8328 | procedure Add_Call (T : Entity_Id) is |
8329 | Exp : Node_Id; | |
d9f6a4ee | 8330 | |
eb66e842 | 8331 | begin |
8332 | if Present (T) and then Present (Predicate_Function (T)) then | |
8333 | Set_Has_Predicates (Typ); | |
d9f6a4ee | 8334 | |
eb66e842 | 8335 | -- Build the call to the predicate function of T |
d9f6a4ee | 8336 | |
eb66e842 | 8337 | Exp := |
8338 | Make_Predicate_Call | |
8339 | (T, Convert_To (T, Make_Identifier (Loc, Object_Name))); | |
d9f6a4ee | 8340 | |
eb66e842 | 8341 | -- Add call to evolving expression, using AND THEN if needed |
d9f6a4ee | 8342 | |
eb66e842 | 8343 | if No (Expr) then |
8344 | Expr := Exp; | |
3b23aaa0 | 8345 | |
eb66e842 | 8346 | else |
8347 | Expr := | |
3b23aaa0 | 8348 | Make_And_Then (Sloc (Expr), |
eb66e842 | 8349 | Left_Opnd => Relocate_Node (Expr), |
8350 | Right_Opnd => Exp); | |
8351 | end if; | |
d9f6a4ee | 8352 | |
eb66e842 | 8353 | -- Output info message on inheritance if required. Note we do not |
8354 | -- give this information for generic actual types, since it is | |
8355 | -- unwelcome noise in that case in instantiations. We also | |
8356 | -- generally suppress the message in instantiations, and also | |
8357 | -- if it involves internal names. | |
d9f6a4ee | 8358 | |
eb66e842 | 8359 | if Opt.List_Inherited_Aspects |
8360 | and then not Is_Generic_Actual_Type (Typ) | |
8361 | and then Instantiation_Depth (Sloc (Typ)) = 0 | |
8362 | and then not Is_Internal_Name (Chars (T)) | |
8363 | and then not Is_Internal_Name (Chars (Typ)) | |
8364 | then | |
8365 | Error_Msg_Sloc := Sloc (Predicate_Function (T)); | |
8366 | Error_Msg_Node_2 := T; | |
8367 | Error_Msg_N ("info: & inherits predicate from & #?L?", Typ); | |
8368 | end if; | |
8369 | end if; | |
8370 | end Add_Call; | |
d9f6a4ee | 8371 | |
eb66e842 | 8372 | -------------------- |
8373 | -- Add_Predicates -- | |
8374 | -------------------- | |
d9f6a4ee | 8375 | |
eb66e842 | 8376 | procedure Add_Predicates is |
8377 | Ritem : Node_Id; | |
8378 | Arg1 : Node_Id; | |
8379 | Arg2 : Node_Id; | |
d9f6a4ee | 8380 | |
eb66e842 | 8381 | procedure Replace_Type_Reference (N : Node_Id); |
8382 | -- Replace a single occurrence N of the subtype name with a reference | |
8383 | -- to the formal of the predicate function. N can be an identifier | |
8384 | -- referencing the subtype, or a selected component, representing an | |
8385 | -- appropriately qualified occurrence of the subtype name. | |
d9f6a4ee | 8386 | |
eb66e842 | 8387 | procedure Replace_Type_References is |
8388 | new Replace_Type_References_Generic (Replace_Type_Reference); | |
8389 | -- Traverse an expression changing every occurrence of an identifier | |
8390 | -- whose name matches the name of the subtype with a reference to | |
8391 | -- the formal parameter of the predicate function. | |
d9f6a4ee | 8392 | |
eb66e842 | 8393 | ---------------------------- |
8394 | -- Replace_Type_Reference -- | |
8395 | ---------------------------- | |
d9f6a4ee | 8396 | |
eb66e842 | 8397 | procedure Replace_Type_Reference (N : Node_Id) is |
8398 | begin | |
8399 | Rewrite (N, Make_Identifier (Sloc (N), Object_Name)); | |
8400 | -- Use the Sloc of the usage name, not the defining name | |
d97beb2f | 8401 | |
eb66e842 | 8402 | Set_Etype (N, Typ); |
8403 | Set_Entity (N, Object_Entity); | |
d97beb2f | 8404 | |
eb66e842 | 8405 | -- We want to treat the node as if it comes from source, so that |
8406 | -- ASIS will not ignore it | |
d97beb2f | 8407 | |
eb66e842 | 8408 | Set_Comes_From_Source (N, True); |
8409 | end Replace_Type_Reference; | |
d97beb2f | 8410 | |
eb66e842 | 8411 | -- Start of processing for Add_Predicates |
d97beb2f | 8412 | |
eb66e842 | 8413 | begin |
8414 | Ritem := First_Rep_Item (Typ); | |
8415 | while Present (Ritem) loop | |
8416 | if Nkind (Ritem) = N_Pragma | |
8417 | and then Pragma_Name (Ritem) = Name_Predicate | |
8418 | then | |
eb66e842 | 8419 | -- Acquire arguments |
d97beb2f | 8420 | |
eb66e842 | 8421 | Arg1 := First (Pragma_Argument_Associations (Ritem)); |
8422 | Arg2 := Next (Arg1); | |
d97beb2f | 8423 | |
eb66e842 | 8424 | Arg1 := Get_Pragma_Arg (Arg1); |
8425 | Arg2 := Get_Pragma_Arg (Arg2); | |
d97beb2f | 8426 | |
eb66e842 | 8427 | -- See if this predicate pragma is for the current type or for |
8428 | -- its full view. A predicate on a private completion is placed | |
8429 | -- on the partial view beause this is the visible entity that | |
8430 | -- is frozen. | |
639c3741 | 8431 | |
eb66e842 | 8432 | if Entity (Arg1) = Typ |
8433 | or else Full_View (Entity (Arg1)) = Typ | |
639c3741 | 8434 | then |
eb66e842 | 8435 | -- We have a match, this entry is for our subtype |
639c3741 | 8436 | |
eb66e842 | 8437 | -- We need to replace any occurrences of the name of the |
8438 | -- type with references to the object. | |
639c3741 | 8439 | |
37c6552c | 8440 | Replace_Type_References (Arg2, Typ); |
639c3741 | 8441 | |
eb66e842 | 8442 | -- If this predicate comes from an aspect, find the aspect |
8443 | -- specification, and replace the saved expression because | |
8444 | -- we need the subtype references replaced for the calls to | |
8445 | -- Preanalyze_Spec_Expressin in Check_Aspect_At_Freeze_Point | |
8446 | -- and Check_Aspect_At_End_Of_Declarations. | |
639c3741 | 8447 | |
eb66e842 | 8448 | if From_Aspect_Specification (Ritem) then |
8449 | declare | |
8450 | Aitem : Node_Id; | |
639c3741 | 8451 | |
eb66e842 | 8452 | begin |
8453 | -- Loop to find corresponding aspect, note that this | |
8454 | -- must be present given the pragma is marked delayed. | |
639c3741 | 8455 | |
eb66e842 | 8456 | Aitem := Next_Rep_Item (Ritem); |
8457 | loop | |
8458 | if Nkind (Aitem) = N_Aspect_Specification | |
8459 | and then Aspect_Rep_Item (Aitem) = Ritem | |
8460 | then | |
8461 | Set_Entity | |
8462 | (Identifier (Aitem), New_Copy_Tree (Arg2)); | |
8463 | exit; | |
8464 | end if; | |
639c3741 | 8465 | |
eb66e842 | 8466 | Aitem := Next_Rep_Item (Aitem); |
8467 | end loop; | |
8468 | end; | |
8469 | end if; | |
737e8460 | 8470 | |
eb66e842 | 8471 | -- Now we can add the expression |
737e8460 | 8472 | |
eb66e842 | 8473 | if No (Expr) then |
8474 | Expr := Relocate_Node (Arg2); | |
d97beb2f | 8475 | |
eb66e842 | 8476 | -- There already was a predicate, so add to it |
d97beb2f | 8477 | |
eb66e842 | 8478 | else |
8479 | Expr := | |
8480 | Make_And_Then (Loc, | |
8481 | Left_Opnd => Relocate_Node (Expr), | |
8482 | Right_Opnd => Relocate_Node (Arg2)); | |
8483 | end if; | |
8484 | end if; | |
8485 | end if; | |
d97beb2f | 8486 | |
eb66e842 | 8487 | Next_Rep_Item (Ritem); |
8488 | end loop; | |
8489 | end Add_Predicates; | |
d97beb2f | 8490 | |
eb66e842 | 8491 | ---------------- |
8492 | -- Process_RE -- | |
8493 | ---------------- | |
d97beb2f | 8494 | |
eb66e842 | 8495 | function Process_RE (N : Node_Id) return Traverse_Result is |
d9f6a4ee | 8496 | begin |
eb66e842 | 8497 | if Nkind (N) = N_Raise_Expression then |
8498 | Set_Convert_To_Return_False (N); | |
8499 | return Skip; | |
d9f6a4ee | 8500 | else |
eb66e842 | 8501 | return OK; |
d9f6a4ee | 8502 | end if; |
eb66e842 | 8503 | end Process_RE; |
d7c2851f | 8504 | |
d9f6a4ee | 8505 | ------------- |
eb66e842 | 8506 | -- Test_RE -- |
d9f6a4ee | 8507 | ------------- |
d7c2851f | 8508 | |
eb66e842 | 8509 | function Test_RE (N : Node_Id) return Traverse_Result is |
d97beb2f | 8510 | begin |
eb66e842 | 8511 | if Nkind (N) = N_Raise_Expression then |
8512 | Raise_Expression_Present := True; | |
8513 | return Abandon; | |
8514 | else | |
8515 | return OK; | |
8516 | end if; | |
8517 | end Test_RE; | |
d97beb2f | 8518 | |
eb66e842 | 8519 | -- Start of processing for Build_Predicate_Functions |
d97beb2f | 8520 | |
eb66e842 | 8521 | begin |
8522 | -- Return if already built or if type does not have predicates | |
9dc88aea | 8523 | |
eb66e842 | 8524 | if not Has_Predicates (Typ) |
8525 | or else Present (Predicate_Function (Typ)) | |
8526 | then | |
8527 | return; | |
8528 | end if; | |
d9f6a4ee | 8529 | |
eb66e842 | 8530 | -- Prepare to construct predicate expression |
d97beb2f | 8531 | |
eb66e842 | 8532 | Expr := Empty; |
d97beb2f | 8533 | |
eb66e842 | 8534 | -- Add Predicates for the current type |
d97beb2f | 8535 | |
eb66e842 | 8536 | Add_Predicates; |
d97beb2f | 8537 | |
eb66e842 | 8538 | -- Add predicates for ancestor if present |
d97beb2f | 8539 | |
eb66e842 | 8540 | declare |
8541 | Atyp : constant Entity_Id := Nearest_Ancestor (Typ); | |
d9f6a4ee | 8542 | begin |
eb66e842 | 8543 | if Present (Atyp) then |
8544 | Add_Call (Atyp); | |
8545 | end if; | |
8546 | end; | |
9dc88aea | 8547 | |
eb66e842 | 8548 | -- Case where predicates are present |
9dc88aea | 8549 | |
eb66e842 | 8550 | if Present (Expr) then |
726fd56a | 8551 | |
eb66e842 | 8552 | -- Test for raise expression present |
726fd56a | 8553 | |
eb66e842 | 8554 | Test_REs (Expr); |
9dc88aea | 8555 | |
eb66e842 | 8556 | -- If raise expression is present, capture a copy of Expr for use |
8557 | -- in building the predicateM function version later on. For this | |
8558 | -- copy we replace references to Object_Entity by Object_Entity_M. | |
9dc88aea | 8559 | |
eb66e842 | 8560 | if Raise_Expression_Present then |
8561 | declare | |
299b347e | 8562 | Map : constant Elist_Id := New_Elmt_List; |
8563 | New_V : Entity_Id := Empty; | |
8564 | ||
8565 | -- The unanalyzed expression will be copied and appear in | |
8566 | -- both functions. Normally expressions do not declare new | |
8567 | -- entities, but quantified expressions do, so we need to | |
8568 | -- create new entities for their bound variables, to prevent | |
8569 | -- multiple definitions in gigi. | |
8570 | ||
8571 | function Reset_Loop_Variable (N : Node_Id) | |
8572 | return Traverse_Result; | |
8573 | ||
8574 | procedure Collect_Loop_Variables is | |
8575 | new Traverse_Proc (Reset_Loop_Variable); | |
8576 | ||
8577 | ------------------------ | |
8578 | -- Reset_Loop_Variable -- | |
8579 | ------------------------ | |
8580 | ||
8581 | function Reset_Loop_Variable (N : Node_Id) | |
8582 | return Traverse_Result | |
8583 | is | |
8584 | begin | |
8585 | if Nkind (N) = N_Iterator_Specification then | |
8586 | New_V := Make_Defining_Identifier | |
8587 | (Sloc (N), Chars (Defining_Identifier (N))); | |
8588 | ||
8589 | Set_Defining_Identifier (N, New_V); | |
8590 | end if; | |
8591 | ||
8592 | return OK; | |
8593 | end Reset_Loop_Variable; | |
8594 | ||
eb66e842 | 8595 | begin |
8596 | Append_Elmt (Object_Entity, Map); | |
8597 | Append_Elmt (Object_Entity_M, Map); | |
8598 | Expr_M := New_Copy_Tree (Expr, Map => Map); | |
299b347e | 8599 | Collect_Loop_Variables (Expr_M); |
eb66e842 | 8600 | end; |
8601 | end if; | |
d97beb2f | 8602 | |
eb66e842 | 8603 | -- Build the main predicate function |
9dc88aea | 8604 | |
eb66e842 | 8605 | declare |
8606 | SId : constant Entity_Id := | |
8607 | Make_Defining_Identifier (Loc, | |
8608 | Chars => New_External_Name (Chars (Typ), "Predicate")); | |
8609 | -- The entity for the the function spec | |
9dc88aea | 8610 | |
eb66e842 | 8611 | SIdB : constant Entity_Id := |
8612 | Make_Defining_Identifier (Loc, | |
8613 | Chars => New_External_Name (Chars (Typ), "Predicate")); | |
8614 | -- The entity for the function body | |
9dc88aea | 8615 | |
eb66e842 | 8616 | Spec : Node_Id; |
8617 | FDecl : Node_Id; | |
8618 | FBody : Node_Id; | |
9dc88aea | 8619 | |
eb66e842 | 8620 | begin |
8621 | -- Build function declaration | |
d97beb2f | 8622 | |
eb66e842 | 8623 | Set_Ekind (SId, E_Function); |
8624 | Set_Is_Internal (SId); | |
8625 | Set_Is_Predicate_Function (SId); | |
8626 | Set_Predicate_Function (Typ, SId); | |
d97beb2f | 8627 | |
eb66e842 | 8628 | -- The predicate function is shared between views of a type |
d97beb2f | 8629 | |
eb66e842 | 8630 | if Is_Private_Type (Typ) and then Present (Full_View (Typ)) then |
8631 | Set_Predicate_Function (Full_View (Typ), SId); | |
d97beb2f | 8632 | end if; |
d97beb2f | 8633 | |
eb66e842 | 8634 | Spec := |
8635 | Make_Function_Specification (Loc, | |
8636 | Defining_Unit_Name => SId, | |
8637 | Parameter_Specifications => New_List ( | |
8638 | Make_Parameter_Specification (Loc, | |
8639 | Defining_Identifier => Object_Entity, | |
8640 | Parameter_Type => New_Occurrence_Of (Typ, Loc))), | |
8641 | Result_Definition => | |
8642 | New_Occurrence_Of (Standard_Boolean, Loc)); | |
d97beb2f | 8643 | |
eb66e842 | 8644 | FDecl := |
8645 | Make_Subprogram_Declaration (Loc, | |
8646 | Specification => Spec); | |
d97beb2f | 8647 | |
eb66e842 | 8648 | -- Build function body |
d97beb2f | 8649 | |
eb66e842 | 8650 | Spec := |
8651 | Make_Function_Specification (Loc, | |
8652 | Defining_Unit_Name => SIdB, | |
8653 | Parameter_Specifications => New_List ( | |
8654 | Make_Parameter_Specification (Loc, | |
8655 | Defining_Identifier => | |
8656 | Make_Defining_Identifier (Loc, Object_Name), | |
8657 | Parameter_Type => | |
8658 | New_Occurrence_Of (Typ, Loc))), | |
8659 | Result_Definition => | |
8660 | New_Occurrence_Of (Standard_Boolean, Loc)); | |
d97beb2f | 8661 | |
eb66e842 | 8662 | FBody := |
8663 | Make_Subprogram_Body (Loc, | |
8664 | Specification => Spec, | |
8665 | Declarations => Empty_List, | |
8666 | Handled_Statement_Sequence => | |
8667 | Make_Handled_Sequence_Of_Statements (Loc, | |
8668 | Statements => New_List ( | |
8669 | Make_Simple_Return_Statement (Loc, | |
8670 | Expression => Expr)))); | |
9dc88aea | 8671 | |
eb66e842 | 8672 | -- Insert declaration before freeze node and body after |
d97beb2f | 8673 | |
eb66e842 | 8674 | Insert_Before_And_Analyze (N, FDecl); |
8675 | Insert_After_And_Analyze (N, FBody); | |
d9f6a4ee | 8676 | end; |
d97beb2f | 8677 | |
eb66e842 | 8678 | -- Test for raise expressions present and if so build M version |
d97beb2f | 8679 | |
eb66e842 | 8680 | if Raise_Expression_Present then |
8681 | declare | |
8682 | SId : constant Entity_Id := | |
8683 | Make_Defining_Identifier (Loc, | |
8684 | Chars => New_External_Name (Chars (Typ), "PredicateM")); | |
8685 | -- The entity for the the function spec | |
d97beb2f | 8686 | |
eb66e842 | 8687 | SIdB : constant Entity_Id := |
8688 | Make_Defining_Identifier (Loc, | |
8689 | Chars => New_External_Name (Chars (Typ), "PredicateM")); | |
8690 | -- The entity for the function body | |
b9e61b2a | 8691 | |
eb66e842 | 8692 | Spec : Node_Id; |
8693 | FDecl : Node_Id; | |
8694 | FBody : Node_Id; | |
8695 | BTemp : Entity_Id; | |
d97beb2f | 8696 | |
eb66e842 | 8697 | begin |
8698 | -- Mark any raise expressions for special expansion | |
d97beb2f | 8699 | |
eb66e842 | 8700 | Process_REs (Expr_M); |
d97beb2f | 8701 | |
eb66e842 | 8702 | -- Build function declaration |
d97beb2f | 8703 | |
eb66e842 | 8704 | Set_Ekind (SId, E_Function); |
8705 | Set_Is_Predicate_Function_M (SId); | |
8706 | Set_Predicate_Function_M (Typ, SId); | |
d97beb2f | 8707 | |
eb66e842 | 8708 | -- The predicate function is shared between views of a type |
d97beb2f | 8709 | |
eb66e842 | 8710 | if Is_Private_Type (Typ) and then Present (Full_View (Typ)) then |
8711 | Set_Predicate_Function_M (Full_View (Typ), SId); | |
8712 | end if; | |
9dc88aea | 8713 | |
eb66e842 | 8714 | Spec := |
8715 | Make_Function_Specification (Loc, | |
8716 | Defining_Unit_Name => SId, | |
8717 | Parameter_Specifications => New_List ( | |
8718 | Make_Parameter_Specification (Loc, | |
8719 | Defining_Identifier => Object_Entity_M, | |
8720 | Parameter_Type => New_Occurrence_Of (Typ, Loc))), | |
8721 | Result_Definition => | |
8722 | New_Occurrence_Of (Standard_Boolean, Loc)); | |
9dc88aea | 8723 | |
eb66e842 | 8724 | FDecl := |
8725 | Make_Subprogram_Declaration (Loc, | |
8726 | Specification => Spec); | |
9dc88aea | 8727 | |
eb66e842 | 8728 | -- Build function body |
9dc88aea | 8729 | |
eb66e842 | 8730 | Spec := |
8731 | Make_Function_Specification (Loc, | |
8732 | Defining_Unit_Name => SIdB, | |
8733 | Parameter_Specifications => New_List ( | |
8734 | Make_Parameter_Specification (Loc, | |
8735 | Defining_Identifier => | |
8736 | Make_Defining_Identifier (Loc, Object_Name), | |
8737 | Parameter_Type => | |
8738 | New_Occurrence_Of (Typ, Loc))), | |
8739 | Result_Definition => | |
8740 | New_Occurrence_Of (Standard_Boolean, Loc)); | |
9dc88aea | 8741 | |
eb66e842 | 8742 | -- Build the body, we declare the boolean expression before |
8743 | -- doing the return, because we are not really confident of | |
8744 | -- what happens if a return appears within a return. | |
9dc88aea | 8745 | |
eb66e842 | 8746 | BTemp := |
8747 | Make_Defining_Identifier (Loc, | |
8748 | Chars => New_Internal_Name ('B')); | |
9dc88aea | 8749 | |
eb66e842 | 8750 | FBody := |
8751 | Make_Subprogram_Body (Loc, | |
8752 | Specification => Spec, | |
9dc88aea | 8753 | |
eb66e842 | 8754 | Declarations => New_List ( |
8755 | Make_Object_Declaration (Loc, | |
8756 | Defining_Identifier => BTemp, | |
8757 | Constant_Present => True, | |
8758 | Object_Definition => | |
8759 | New_Occurrence_Of (Standard_Boolean, Loc), | |
8760 | Expression => Expr_M)), | |
d97beb2f | 8761 | |
eb66e842 | 8762 | Handled_Statement_Sequence => |
8763 | Make_Handled_Sequence_Of_Statements (Loc, | |
8764 | Statements => New_List ( | |
8765 | Make_Simple_Return_Statement (Loc, | |
8766 | Expression => New_Occurrence_Of (BTemp, Loc))))); | |
d97beb2f | 8767 | |
eb66e842 | 8768 | -- Insert declaration before freeze node and body after |
d97beb2f | 8769 | |
eb66e842 | 8770 | Insert_Before_And_Analyze (N, FDecl); |
8771 | Insert_After_And_Analyze (N, FBody); | |
8772 | end; | |
8773 | end if; | |
9dc88aea | 8774 | |
3b23aaa0 | 8775 | -- See if we have a static predicate. Note that the answer may be |
8776 | -- yes even if we have an explicit Dynamic_Predicate present. | |
9dc88aea | 8777 | |
3b23aaa0 | 8778 | declare |
94d896aa | 8779 | PS : Boolean; |
3b23aaa0 | 8780 | EN : Node_Id; |
9dc88aea | 8781 | |
3b23aaa0 | 8782 | begin |
94d896aa | 8783 | if not Is_Scalar_Type (Typ) and then not Is_String_Type (Typ) then |
8784 | PS := False; | |
8785 | else | |
8786 | PS := Is_Predicate_Static (Expr, Object_Name); | |
8787 | end if; | |
8788 | ||
a360a0f7 | 8789 | -- Case where we have a predicate-static aspect |
9dc88aea | 8790 | |
3b23aaa0 | 8791 | if PS then |
9dc88aea | 8792 | |
3b23aaa0 | 8793 | -- We don't set Has_Static_Predicate_Aspect, since we can have |
8794 | -- any of the three cases (Predicate, Dynamic_Predicate, or | |
8795 | -- Static_Predicate) generating a predicate with an expression | |
a360a0f7 | 8796 | -- that is predicate-static. We just indicate that we have a |
3b23aaa0 | 8797 | -- predicate that can be treated as static. |
d7c2851f | 8798 | |
3b23aaa0 | 8799 | Set_Has_Static_Predicate (Typ); |
d7c2851f | 8800 | |
3b23aaa0 | 8801 | -- For discrete subtype, build the static predicate list |
9dc88aea | 8802 | |
3b23aaa0 | 8803 | if Is_Discrete_Type (Typ) then |
8804 | Build_Discrete_Static_Predicate (Typ, Expr, Object_Name); | |
8805 | ||
8806 | -- If we don't get a static predicate list, it means that we | |
8807 | -- have a case where this is not possible, most typically in | |
8808 | -- the case where we inherit a dynamic predicate. We do not | |
8809 | -- consider this an error, we just leave the predicate as | |
8810 | -- dynamic. But if we do succeed in building the list, then | |
8811 | -- we mark the predicate as static. | |
8812 | ||
5c6a5792 | 8813 | if No (Static_Discrete_Predicate (Typ)) then |
3b23aaa0 | 8814 | Set_Has_Static_Predicate (Typ, False); |
8815 | end if; | |
94d896aa | 8816 | |
8817 | -- For real or string subtype, save predicate expression | |
8818 | ||
8819 | elsif Is_Real_Type (Typ) or else Is_String_Type (Typ) then | |
8820 | Set_Static_Real_Or_String_Predicate (Typ, Expr); | |
3b23aaa0 | 8821 | end if; |
8822 | ||
8823 | -- Case of dynamic predicate (expression is not predicate-static) | |
9dc88aea | 8824 | |
eb66e842 | 8825 | else |
3b23aaa0 | 8826 | -- Again, we don't set Has_Dynamic_Predicate_Aspect, since that |
8827 | -- is only set if we have an explicit Dynamic_Predicate aspect | |
8828 | -- given. Here we may simply have a Predicate aspect where the | |
8829 | -- expression happens not to be predicate-static. | |
8830 | ||
8831 | -- Emit an error when the predicate is categorized as static | |
8832 | -- but its expression is not predicate-static. | |
8833 | ||
8834 | -- First a little fiddling to get a nice location for the | |
8835 | -- message. If the expression is of the form (A and then B), | |
8836 | -- then use the left operand for the Sloc. This avoids getting | |
a360a0f7 | 8837 | -- confused by a call to a higher-level predicate with a less |
3b23aaa0 | 8838 | -- convenient source location. |
8839 | ||
8840 | EN := Expr; | |
8841 | while Nkind (EN) = N_And_Then loop | |
8842 | EN := Left_Opnd (EN); | |
8843 | end loop; | |
8844 | ||
8845 | -- Now post appropriate message | |
8846 | ||
8847 | if Has_Static_Predicate_Aspect (Typ) then | |
94d896aa | 8848 | if Is_Scalar_Type (Typ) or else Is_String_Type (Typ) then |
3b23aaa0 | 8849 | Error_Msg_F |
26279d91 | 8850 | ("expression is not predicate-static (RM 3.2.4(16-22))", |
3b23aaa0 | 8851 | EN); |
8852 | else | |
94d896aa | 8853 | Error_Msg_F |
8854 | ("static predicate requires scalar or string type", EN); | |
3b23aaa0 | 8855 | end if; |
8856 | end if; | |
eb66e842 | 8857 | end if; |
3b23aaa0 | 8858 | end; |
eb66e842 | 8859 | end if; |
8860 | end Build_Predicate_Functions; | |
9dc88aea | 8861 | |
d9f6a4ee | 8862 | ----------------------------------------- |
8863 | -- Check_Aspect_At_End_Of_Declarations -- | |
8864 | ----------------------------------------- | |
9dc88aea | 8865 | |
d9f6a4ee | 8866 | procedure Check_Aspect_At_End_Of_Declarations (ASN : Node_Id) is |
8867 | Ent : constant Entity_Id := Entity (ASN); | |
8868 | Ident : constant Node_Id := Identifier (ASN); | |
8869 | A_Id : constant Aspect_Id := Get_Aspect_Id (Chars (Ident)); | |
d7c2851f | 8870 | |
d9f6a4ee | 8871 | End_Decl_Expr : constant Node_Id := Entity (Ident); |
8872 | -- Expression to be analyzed at end of declarations | |
d7c2851f | 8873 | |
d9f6a4ee | 8874 | Freeze_Expr : constant Node_Id := Expression (ASN); |
8875 | -- Expression from call to Check_Aspect_At_Freeze_Point | |
d7c2851f | 8876 | |
d9f6a4ee | 8877 | T : constant Entity_Id := Etype (Freeze_Expr); |
8878 | -- Type required for preanalyze call | |
d7c2851f | 8879 | |
d9f6a4ee | 8880 | Err : Boolean; |
8881 | -- Set False if error | |
9dc88aea | 8882 | |
d9f6a4ee | 8883 | -- On entry to this procedure, Entity (Ident) contains a copy of the |
8884 | -- original expression from the aspect, saved for this purpose, and | |
8885 | -- but Expression (Ident) is a preanalyzed copy of the expression, | |
8886 | -- preanalyzed just after the freeze point. | |
9dc88aea | 8887 | |
d9f6a4ee | 8888 | procedure Check_Overloaded_Name; |
8889 | -- For aspects whose expression is simply a name, this routine checks if | |
8890 | -- the name is overloaded or not. If so, it verifies there is an | |
8891 | -- interpretation that matches the entity obtained at the freeze point, | |
8892 | -- otherwise the compiler complains. | |
9dc88aea | 8893 | |
d9f6a4ee | 8894 | --------------------------- |
8895 | -- Check_Overloaded_Name -- | |
8896 | --------------------------- | |
8897 | ||
8898 | procedure Check_Overloaded_Name is | |
d97beb2f | 8899 | begin |
d9f6a4ee | 8900 | if not Is_Overloaded (End_Decl_Expr) then |
5ac76cee | 8901 | Err := not Is_Entity_Name (End_Decl_Expr) |
8902 | or else Entity (End_Decl_Expr) /= Entity (Freeze_Expr); | |
d9f6a4ee | 8903 | |
d97beb2f | 8904 | else |
d9f6a4ee | 8905 | Err := True; |
9dc88aea | 8906 | |
d9f6a4ee | 8907 | declare |
8908 | Index : Interp_Index; | |
8909 | It : Interp; | |
9dc88aea | 8910 | |
d9f6a4ee | 8911 | begin |
8912 | Get_First_Interp (End_Decl_Expr, Index, It); | |
8913 | while Present (It.Typ) loop | |
8914 | if It.Nam = Entity (Freeze_Expr) then | |
8915 | Err := False; | |
8916 | exit; | |
8917 | end if; | |
8918 | ||
8919 | Get_Next_Interp (Index, It); | |
8920 | end loop; | |
8921 | end; | |
9dc88aea | 8922 | end if; |
d9f6a4ee | 8923 | end Check_Overloaded_Name; |
9dc88aea | 8924 | |
d9f6a4ee | 8925 | -- Start of processing for Check_Aspect_At_End_Of_Declarations |
9dc88aea | 8926 | |
d9f6a4ee | 8927 | begin |
8928 | -- Case of aspects Dimension, Dimension_System and Synchronization | |
9dc88aea | 8929 | |
d9f6a4ee | 8930 | if A_Id = Aspect_Synchronization then |
8931 | return; | |
d97beb2f | 8932 | |
d9f6a4ee | 8933 | -- Case of stream attributes, just have to compare entities. However, |
8934 | -- the expression is just a name (possibly overloaded), and there may | |
8935 | -- be stream operations declared for unrelated types, so we just need | |
8936 | -- to verify that one of these interpretations is the one available at | |
8937 | -- at the freeze point. | |
9dc88aea | 8938 | |
d9f6a4ee | 8939 | elsif A_Id = Aspect_Input or else |
f02a9a9a | 8940 | A_Id = Aspect_Output or else |
8941 | A_Id = Aspect_Read or else | |
8942 | A_Id = Aspect_Write | |
d9f6a4ee | 8943 | then |
8944 | Analyze (End_Decl_Expr); | |
8945 | Check_Overloaded_Name; | |
9dc88aea | 8946 | |
d9f6a4ee | 8947 | elsif A_Id = Aspect_Variable_Indexing or else |
8948 | A_Id = Aspect_Constant_Indexing or else | |
8949 | A_Id = Aspect_Default_Iterator or else | |
8950 | A_Id = Aspect_Iterator_Element | |
8951 | then | |
8952 | -- Make type unfrozen before analysis, to prevent spurious errors | |
8953 | -- about late attributes. | |
9dc88aea | 8954 | |
d9f6a4ee | 8955 | Set_Is_Frozen (Ent, False); |
8956 | Analyze (End_Decl_Expr); | |
8957 | Set_Is_Frozen (Ent, True); | |
9dc88aea | 8958 | |
d9f6a4ee | 8959 | -- If the end of declarations comes before any other freeze |
8960 | -- point, the Freeze_Expr is not analyzed: no check needed. | |
9dc88aea | 8961 | |
d9f6a4ee | 8962 | if Analyzed (Freeze_Expr) and then not In_Instance then |
8963 | Check_Overloaded_Name; | |
8964 | else | |
8965 | Err := False; | |
8966 | end if; | |
55e8372b | 8967 | |
d9f6a4ee | 8968 | -- All other cases |
55e8372b | 8969 | |
d9f6a4ee | 8970 | else |
c1efebf9 | 8971 | -- Indicate that the expression comes from an aspect specification, |
8972 | -- which is used in subsequent analysis even if expansion is off. | |
8973 | ||
8974 | Set_Parent (End_Decl_Expr, ASN); | |
8975 | ||
d9f6a4ee | 8976 | -- In a generic context the aspect expressions have not been |
8977 | -- preanalyzed, so do it now. There are no conformance checks | |
8978 | -- to perform in this case. | |
55e8372b | 8979 | |
d9f6a4ee | 8980 | if No (T) then |
8981 | Check_Aspect_At_Freeze_Point (ASN); | |
8982 | return; | |
55e8372b | 8983 | |
d9f6a4ee | 8984 | -- The default values attributes may be defined in the private part, |
8985 | -- and the analysis of the expression may take place when only the | |
8986 | -- partial view is visible. The expression must be scalar, so use | |
8987 | -- the full view to resolve. | |
55e8372b | 8988 | |
d9f6a4ee | 8989 | elsif (A_Id = Aspect_Default_Value |
8990 | or else | |
8991 | A_Id = Aspect_Default_Component_Value) | |
8992 | and then Is_Private_Type (T) | |
8993 | then | |
8994 | Preanalyze_Spec_Expression (End_Decl_Expr, Full_View (T)); | |
c1efebf9 | 8995 | |
d9f6a4ee | 8996 | else |
8997 | Preanalyze_Spec_Expression (End_Decl_Expr, T); | |
8998 | end if; | |
d97beb2f | 8999 | |
d9f6a4ee | 9000 | Err := not Fully_Conformant_Expressions (End_Decl_Expr, Freeze_Expr); |
9001 | end if; | |
55e8372b | 9002 | |
c1efebf9 | 9003 | -- Output error message if error. Force error on aspect specification |
9004 | -- even if there is an error on the expression itself. | |
55e8372b | 9005 | |
d9f6a4ee | 9006 | if Err then |
9007 | Error_Msg_NE | |
c1efebf9 | 9008 | ("!visibility of aspect for& changes after freeze point", |
d9f6a4ee | 9009 | ASN, Ent); |
9010 | Error_Msg_NE | |
9011 | ("info: & is frozen here, aspects evaluated at this point??", | |
9012 | Freeze_Node (Ent), Ent); | |
9013 | end if; | |
9014 | end Check_Aspect_At_End_Of_Declarations; | |
55e8372b | 9015 | |
d9f6a4ee | 9016 | ---------------------------------- |
9017 | -- Check_Aspect_At_Freeze_Point -- | |
9018 | ---------------------------------- | |
9dc88aea | 9019 | |
d9f6a4ee | 9020 | procedure Check_Aspect_At_Freeze_Point (ASN : Node_Id) is |
9021 | Ident : constant Node_Id := Identifier (ASN); | |
9022 | -- Identifier (use Entity field to save expression) | |
9dc88aea | 9023 | |
d9f6a4ee | 9024 | A_Id : constant Aspect_Id := Get_Aspect_Id (Chars (Ident)); |
9dc88aea | 9025 | |
d9f6a4ee | 9026 | T : Entity_Id := Empty; |
9027 | -- Type required for preanalyze call | |
9dc88aea | 9028 | |
d9f6a4ee | 9029 | begin |
9030 | -- On entry to this procedure, Entity (Ident) contains a copy of the | |
9031 | -- original expression from the aspect, saved for this purpose. | |
9dc88aea | 9032 | |
d9f6a4ee | 9033 | -- On exit from this procedure Entity (Ident) is unchanged, still |
9034 | -- containing that copy, but Expression (Ident) is a preanalyzed copy | |
9035 | -- of the expression, preanalyzed just after the freeze point. | |
d97beb2f | 9036 | |
d9f6a4ee | 9037 | -- Make a copy of the expression to be preanalyzed |
d97beb2f | 9038 | |
d9f6a4ee | 9039 | Set_Expression (ASN, New_Copy_Tree (Entity (Ident))); |
d97beb2f | 9040 | |
d9f6a4ee | 9041 | -- Find type for preanalyze call |
d97beb2f | 9042 | |
d9f6a4ee | 9043 | case A_Id is |
9dc88aea | 9044 | |
d9f6a4ee | 9045 | -- No_Aspect should be impossible |
d97beb2f | 9046 | |
d9f6a4ee | 9047 | when No_Aspect => |
9048 | raise Program_Error; | |
9049 | ||
9050 | -- Aspects taking an optional boolean argument | |
d97beb2f | 9051 | |
d9f6a4ee | 9052 | when Boolean_Aspects | |
9053 | Library_Unit_Aspects => | |
9dc88aea | 9054 | |
d9f6a4ee | 9055 | T := Standard_Boolean; |
d7c2851f | 9056 | |
d9f6a4ee | 9057 | -- Aspects corresponding to attribute definition clauses |
9dc88aea | 9058 | |
d9f6a4ee | 9059 | when Aspect_Address => |
9060 | T := RTE (RE_Address); | |
9dc88aea | 9061 | |
d9f6a4ee | 9062 | when Aspect_Attach_Handler => |
9063 | T := RTE (RE_Interrupt_ID); | |
d7c2851f | 9064 | |
d9f6a4ee | 9065 | when Aspect_Bit_Order | Aspect_Scalar_Storage_Order => |
9066 | T := RTE (RE_Bit_Order); | |
d7c2851f | 9067 | |
d9f6a4ee | 9068 | when Aspect_Convention => |
9069 | return; | |
d7c2851f | 9070 | |
d9f6a4ee | 9071 | when Aspect_CPU => |
9072 | T := RTE (RE_CPU_Range); | |
d7c2851f | 9073 | |
d9f6a4ee | 9074 | -- Default_Component_Value is resolved with the component type |
d7c2851f | 9075 | |
d9f6a4ee | 9076 | when Aspect_Default_Component_Value => |
9077 | T := Component_Type (Entity (ASN)); | |
d7c2851f | 9078 | |
647fab54 | 9079 | when Aspect_Default_Storage_Pool => |
9080 | T := Class_Wide_Type (RTE (RE_Root_Storage_Pool)); | |
9081 | ||
d9f6a4ee | 9082 | -- Default_Value is resolved with the type entity in question |
d7c2851f | 9083 | |
d9f6a4ee | 9084 | when Aspect_Default_Value => |
9085 | T := Entity (ASN); | |
9dc88aea | 9086 | |
d9f6a4ee | 9087 | when Aspect_Dispatching_Domain => |
9088 | T := RTE (RE_Dispatching_Domain); | |
9dc88aea | 9089 | |
d9f6a4ee | 9090 | when Aspect_External_Tag => |
9091 | T := Standard_String; | |
9dc88aea | 9092 | |
d9f6a4ee | 9093 | when Aspect_External_Name => |
9094 | T := Standard_String; | |
9dc88aea | 9095 | |
d9f6a4ee | 9096 | when Aspect_Link_Name => |
9097 | T := Standard_String; | |
9dc88aea | 9098 | |
d9f6a4ee | 9099 | when Aspect_Priority | Aspect_Interrupt_Priority => |
9100 | T := Standard_Integer; | |
d97beb2f | 9101 | |
d9f6a4ee | 9102 | when Aspect_Relative_Deadline => |
9103 | T := RTE (RE_Time_Span); | |
d97beb2f | 9104 | |
d9f6a4ee | 9105 | when Aspect_Small => |
9106 | T := Universal_Real; | |
490beba6 | 9107 | |
d9f6a4ee | 9108 | -- For a simple storage pool, we have to retrieve the type of the |
9109 | -- pool object associated with the aspect's corresponding attribute | |
9110 | -- definition clause. | |
490beba6 | 9111 | |
d9f6a4ee | 9112 | when Aspect_Simple_Storage_Pool => |
9113 | T := Etype (Expression (Aspect_Rep_Item (ASN))); | |
d97beb2f | 9114 | |
d9f6a4ee | 9115 | when Aspect_Storage_Pool => |
9116 | T := Class_Wide_Type (RTE (RE_Root_Storage_Pool)); | |
d97beb2f | 9117 | |
d9f6a4ee | 9118 | when Aspect_Alignment | |
9119 | Aspect_Component_Size | | |
9120 | Aspect_Machine_Radix | | |
9121 | Aspect_Object_Size | | |
9122 | Aspect_Size | | |
9123 | Aspect_Storage_Size | | |
9124 | Aspect_Stream_Size | | |
9125 | Aspect_Value_Size => | |
9126 | T := Any_Integer; | |
9dc88aea | 9127 | |
04ae062f | 9128 | when Aspect_Linker_Section => |
9129 | T := Standard_String; | |
9130 | ||
d9f6a4ee | 9131 | when Aspect_Synchronization => |
9132 | return; | |
7d20685d | 9133 | |
d9f6a4ee | 9134 | -- Special case, the expression of these aspects is just an entity |
9135 | -- that does not need any resolution, so just analyze. | |
7d20685d | 9136 | |
d9f6a4ee | 9137 | when Aspect_Input | |
9138 | Aspect_Output | | |
9139 | Aspect_Read | | |
9140 | Aspect_Suppress | | |
9141 | Aspect_Unsuppress | | |
9142 | Aspect_Warnings | | |
9143 | Aspect_Write => | |
9144 | Analyze (Expression (ASN)); | |
9145 | return; | |
7d20685d | 9146 | |
d9f6a4ee | 9147 | -- Same for Iterator aspects, where the expression is a function |
9148 | -- name. Legality rules are checked separately. | |
89f1e35c | 9149 | |
d9f6a4ee | 9150 | when Aspect_Constant_Indexing | |
9151 | Aspect_Default_Iterator | | |
9152 | Aspect_Iterator_Element | | |
9153 | Aspect_Variable_Indexing => | |
9154 | Analyze (Expression (ASN)); | |
9155 | return; | |
7d20685d | 9156 | |
b3f8228a | 9157 | -- Ditto for Iterable, legality checks in Validate_Iterable_Aspect. |
9158 | ||
9159 | when Aspect_Iterable => | |
3061ffde | 9160 | T := Entity (ASN); |
9161 | ||
b3f8228a | 9162 | declare |
a9f5fea7 | 9163 | Cursor : constant Entity_Id := Get_Cursor_Type (ASN, T); |
3061ffde | 9164 | Assoc : Node_Id; |
9165 | Expr : Node_Id; | |
a9f5fea7 | 9166 | |
b3f8228a | 9167 | begin |
a9f5fea7 | 9168 | if Cursor = Any_Type then |
9169 | return; | |
9170 | end if; | |
9171 | ||
b3f8228a | 9172 | Assoc := First (Component_Associations (Expression (ASN))); |
9173 | while Present (Assoc) loop | |
3061ffde | 9174 | Expr := Expression (Assoc); |
9175 | Analyze (Expr); | |
a9f5fea7 | 9176 | |
9177 | if not Error_Posted (Expr) then | |
9178 | Resolve_Iterable_Operation | |
9179 | (Expr, Cursor, T, Chars (First (Choices (Assoc)))); | |
9180 | end if; | |
9181 | ||
b3f8228a | 9182 | Next (Assoc); |
9183 | end loop; | |
9184 | end; | |
3061ffde | 9185 | |
b3f8228a | 9186 | return; |
9187 | ||
d9f6a4ee | 9188 | -- Invariant/Predicate take boolean expressions |
7d20685d | 9189 | |
d9f6a4ee | 9190 | when Aspect_Dynamic_Predicate | |
9191 | Aspect_Invariant | | |
9192 | Aspect_Predicate | | |
9193 | Aspect_Static_Predicate | | |
9194 | Aspect_Type_Invariant => | |
9195 | T := Standard_Boolean; | |
7d20685d | 9196 | |
d9f6a4ee | 9197 | -- Here is the list of aspects that don't require delay analysis |
89f1e35c | 9198 | |
ec6f6da5 | 9199 | when Aspect_Abstract_State | |
9200 | Aspect_Annotate | | |
9201 | Aspect_Contract_Cases | | |
9202 | Aspect_Default_Initial_Condition | | |
3dbe7a69 | 9203 | Aspect_Depends | |
ec6f6da5 | 9204 | Aspect_Dimension | |
9205 | Aspect_Dimension_System | | |
cab27d2a | 9206 | Aspect_Extensions_Visible | |
3dbe7a69 | 9207 | Aspect_Ghost | |
9208 | Aspect_Global | | |
ec6f6da5 | 9209 | Aspect_Implicit_Dereference | |
9210 | Aspect_Initial_Condition | | |
9211 | Aspect_Initializes | | |
1fd4313f | 9212 | Aspect_Obsolescent | |
ec6f6da5 | 9213 | Aspect_Part_Of | |
9214 | Aspect_Post | | |
9215 | Aspect_Postcondition | | |
9216 | Aspect_Pre | | |
9217 | Aspect_Precondition | | |
9218 | Aspect_Refined_Depends | | |
9219 | Aspect_Refined_Global | | |
9220 | Aspect_Refined_Post | | |
9221 | Aspect_Refined_State | | |
9222 | Aspect_SPARK_Mode | | |
aa2f48d2 | 9223 | Aspect_Test_Case | |
9224 | Aspect_Unimplemented => | |
d9f6a4ee | 9225 | raise Program_Error; |
2b184b2f | 9226 | |
d9f6a4ee | 9227 | end case; |
2b184b2f | 9228 | |
d9f6a4ee | 9229 | -- Do the preanalyze call |
2b184b2f | 9230 | |
d9f6a4ee | 9231 | Preanalyze_Spec_Expression (Expression (ASN), T); |
9232 | end Check_Aspect_At_Freeze_Point; | |
2b184b2f | 9233 | |
d9f6a4ee | 9234 | ----------------------------------- |
9235 | -- Check_Constant_Address_Clause -- | |
9236 | ----------------------------------- | |
2b184b2f | 9237 | |
d9f6a4ee | 9238 | procedure Check_Constant_Address_Clause |
9239 | (Expr : Node_Id; | |
9240 | U_Ent : Entity_Id) | |
9241 | is | |
9242 | procedure Check_At_Constant_Address (Nod : Node_Id); | |
9243 | -- Checks that the given node N represents a name whose 'Address is | |
9244 | -- constant (in the same sense as OK_Constant_Address_Clause, i.e. the | |
9245 | -- address value is the same at the point of declaration of U_Ent and at | |
9246 | -- the time of elaboration of the address clause. | |
84ed7523 | 9247 | |
d9f6a4ee | 9248 | procedure Check_Expr_Constants (Nod : Node_Id); |
9249 | -- Checks that Nod meets the requirements for a constant address clause | |
9250 | -- in the sense of the enclosing procedure. | |
84ed7523 | 9251 | |
d9f6a4ee | 9252 | procedure Check_List_Constants (Lst : List_Id); |
9253 | -- Check that all elements of list Lst meet the requirements for a | |
9254 | -- constant address clause in the sense of the enclosing procedure. | |
84ed7523 | 9255 | |
d9f6a4ee | 9256 | ------------------------------- |
9257 | -- Check_At_Constant_Address -- | |
9258 | ------------------------------- | |
84ed7523 | 9259 | |
d9f6a4ee | 9260 | procedure Check_At_Constant_Address (Nod : Node_Id) is |
9261 | begin | |
9262 | if Is_Entity_Name (Nod) then | |
9263 | if Present (Address_Clause (Entity ((Nod)))) then | |
9264 | Error_Msg_NE | |
9265 | ("invalid address clause for initialized object &!", | |
9266 | Nod, U_Ent); | |
9267 | Error_Msg_NE | |
9268 | ("address for& cannot" & | |
9269 | " depend on another address clause! (RM 13.1(22))!", | |
9270 | Nod, U_Ent); | |
84ed7523 | 9271 | |
d9f6a4ee | 9272 | elsif In_Same_Source_Unit (Entity (Nod), U_Ent) |
9273 | and then Sloc (U_Ent) < Sloc (Entity (Nod)) | |
9274 | then | |
9275 | Error_Msg_NE | |
9276 | ("invalid address clause for initialized object &!", | |
9277 | Nod, U_Ent); | |
9278 | Error_Msg_Node_2 := U_Ent; | |
9279 | Error_Msg_NE | |
9280 | ("\& must be defined before & (RM 13.1(22))!", | |
9281 | Nod, Entity (Nod)); | |
9282 | end if; | |
7d20685d | 9283 | |
d9f6a4ee | 9284 | elsif Nkind (Nod) = N_Selected_Component then |
9285 | declare | |
9286 | T : constant Entity_Id := Etype (Prefix (Nod)); | |
59f3e675 | 9287 | |
d9f6a4ee | 9288 | begin |
9289 | if (Is_Record_Type (T) | |
9290 | and then Has_Discriminants (T)) | |
9291 | or else | |
9292 | (Is_Access_Type (T) | |
f02a9a9a | 9293 | and then Is_Record_Type (Designated_Type (T)) |
9294 | and then Has_Discriminants (Designated_Type (T))) | |
d9f6a4ee | 9295 | then |
9296 | Error_Msg_NE | |
9297 | ("invalid address clause for initialized object &!", | |
9298 | Nod, U_Ent); | |
9299 | Error_Msg_N | |
9300 | ("\address cannot depend on component" & | |
9301 | " of discriminated record (RM 13.1(22))!", | |
9302 | Nod); | |
9303 | else | |
9304 | Check_At_Constant_Address (Prefix (Nod)); | |
9305 | end if; | |
9306 | end; | |
89cc7147 | 9307 | |
d9f6a4ee | 9308 | elsif Nkind (Nod) = N_Indexed_Component then |
9309 | Check_At_Constant_Address (Prefix (Nod)); | |
9310 | Check_List_Constants (Expressions (Nod)); | |
89cc7147 | 9311 | |
84ed7523 | 9312 | else |
d9f6a4ee | 9313 | Check_Expr_Constants (Nod); |
84ed7523 | 9314 | end if; |
d9f6a4ee | 9315 | end Check_At_Constant_Address; |
81b424ac | 9316 | |
d9f6a4ee | 9317 | -------------------------- |
9318 | -- Check_Expr_Constants -- | |
9319 | -------------------------- | |
7b9b2f05 | 9320 | |
d9f6a4ee | 9321 | procedure Check_Expr_Constants (Nod : Node_Id) is |
9322 | Loc_U_Ent : constant Source_Ptr := Sloc (U_Ent); | |
9323 | Ent : Entity_Id := Empty; | |
7b9b2f05 | 9324 | |
d9f6a4ee | 9325 | begin |
9326 | if Nkind (Nod) in N_Has_Etype | |
9327 | and then Etype (Nod) = Any_Type | |
7b9b2f05 | 9328 | then |
d9f6a4ee | 9329 | return; |
309c3053 | 9330 | end if; |
9331 | ||
d9f6a4ee | 9332 | case Nkind (Nod) is |
9333 | when N_Empty | N_Error => | |
9334 | return; | |
7d20685d | 9335 | |
d9f6a4ee | 9336 | when N_Identifier | N_Expanded_Name => |
9337 | Ent := Entity (Nod); | |
7d20685d | 9338 | |
d9f6a4ee | 9339 | -- We need to look at the original node if it is different |
9340 | -- from the node, since we may have rewritten things and | |
9341 | -- substituted an identifier representing the rewrite. | |
7d20685d | 9342 | |
d9f6a4ee | 9343 | if Original_Node (Nod) /= Nod then |
9344 | Check_Expr_Constants (Original_Node (Nod)); | |
7d20685d | 9345 | |
d9f6a4ee | 9346 | -- If the node is an object declaration without initial |
9347 | -- value, some code has been expanded, and the expression | |
9348 | -- is not constant, even if the constituents might be | |
9349 | -- acceptable, as in A'Address + offset. | |
7d20685d | 9350 | |
d9f6a4ee | 9351 | if Ekind (Ent) = E_Variable |
9352 | and then | |
9353 | Nkind (Declaration_Node (Ent)) = N_Object_Declaration | |
9354 | and then | |
9355 | No (Expression (Declaration_Node (Ent))) | |
9356 | then | |
9357 | Error_Msg_NE | |
9358 | ("invalid address clause for initialized object &!", | |
9359 | Nod, U_Ent); | |
89f1e35c | 9360 | |
d9f6a4ee | 9361 | -- If entity is constant, it may be the result of expanding |
9362 | -- a check. We must verify that its declaration appears | |
9363 | -- before the object in question, else we also reject the | |
9364 | -- address clause. | |
7d20685d | 9365 | |
d9f6a4ee | 9366 | elsif Ekind (Ent) = E_Constant |
9367 | and then In_Same_Source_Unit (Ent, U_Ent) | |
9368 | and then Sloc (Ent) > Loc_U_Ent | |
9369 | then | |
9370 | Error_Msg_NE | |
9371 | ("invalid address clause for initialized object &!", | |
9372 | Nod, U_Ent); | |
9373 | end if; | |
7d20685d | 9374 | |
d9f6a4ee | 9375 | return; |
9376 | end if; | |
7d20685d | 9377 | |
d9f6a4ee | 9378 | -- Otherwise look at the identifier and see if it is OK |
7d20685d | 9379 | |
d9f6a4ee | 9380 | if Ekind_In (Ent, E_Named_Integer, E_Named_Real) |
9381 | or else Is_Type (Ent) | |
9382 | then | |
9383 | return; | |
7d20685d | 9384 | |
f02a9a9a | 9385 | elsif Ekind_In (Ent, E_Constant, E_In_Parameter) then |
9386 | ||
d9f6a4ee | 9387 | -- This is the case where we must have Ent defined before |
9388 | -- U_Ent. Clearly if they are in different units this | |
9389 | -- requirement is met since the unit containing Ent is | |
9390 | -- already processed. | |
7d20685d | 9391 | |
d9f6a4ee | 9392 | if not In_Same_Source_Unit (Ent, U_Ent) then |
9393 | return; | |
7d20685d | 9394 | |
d9f6a4ee | 9395 | -- Otherwise location of Ent must be before the location |
9396 | -- of U_Ent, that's what prior defined means. | |
7d20685d | 9397 | |
d9f6a4ee | 9398 | elsif Sloc (Ent) < Loc_U_Ent then |
9399 | return; | |
6c545057 | 9400 | |
d9f6a4ee | 9401 | else |
9402 | Error_Msg_NE | |
9403 | ("invalid address clause for initialized object &!", | |
9404 | Nod, U_Ent); | |
9405 | Error_Msg_Node_2 := U_Ent; | |
9406 | Error_Msg_NE | |
9407 | ("\& must be defined before & (RM 13.1(22))!", | |
9408 | Nod, Ent); | |
9409 | end if; | |
37c6e44c | 9410 | |
d9f6a4ee | 9411 | elsif Nkind (Original_Node (Nod)) = N_Function_Call then |
9412 | Check_Expr_Constants (Original_Node (Nod)); | |
6c545057 | 9413 | |
d9f6a4ee | 9414 | else |
9415 | Error_Msg_NE | |
9416 | ("invalid address clause for initialized object &!", | |
9417 | Nod, U_Ent); | |
3cdbaa5a | 9418 | |
d9f6a4ee | 9419 | if Comes_From_Source (Ent) then |
9420 | Error_Msg_NE | |
9421 | ("\reference to variable& not allowed" | |
9422 | & " (RM 13.1(22))!", Nod, Ent); | |
9423 | else | |
9424 | Error_Msg_N | |
9425 | ("non-static expression not allowed" | |
9426 | & " (RM 13.1(22))!", Nod); | |
9427 | end if; | |
9428 | end if; | |
3cdbaa5a | 9429 | |
d9f6a4ee | 9430 | when N_Integer_Literal => |
7f694ca2 | 9431 | |
d9f6a4ee | 9432 | -- If this is a rewritten unchecked conversion, in a system |
9433 | -- where Address is an integer type, always use the base type | |
9434 | -- for a literal value. This is user-friendly and prevents | |
9435 | -- order-of-elaboration issues with instances of unchecked | |
9436 | -- conversion. | |
3cdbaa5a | 9437 | |
d9f6a4ee | 9438 | if Nkind (Original_Node (Nod)) = N_Function_Call then |
9439 | Set_Etype (Nod, Base_Type (Etype (Nod))); | |
9440 | end if; | |
e1cedbae | 9441 | |
d9f6a4ee | 9442 | when N_Real_Literal | |
9443 | N_String_Literal | | |
9444 | N_Character_Literal => | |
9445 | return; | |
7d20685d | 9446 | |
d9f6a4ee | 9447 | when N_Range => |
9448 | Check_Expr_Constants (Low_Bound (Nod)); | |
9449 | Check_Expr_Constants (High_Bound (Nod)); | |
231eb581 | 9450 | |
d9f6a4ee | 9451 | when N_Explicit_Dereference => |
9452 | Check_Expr_Constants (Prefix (Nod)); | |
231eb581 | 9453 | |
d9f6a4ee | 9454 | when N_Indexed_Component => |
9455 | Check_Expr_Constants (Prefix (Nod)); | |
9456 | Check_List_Constants (Expressions (Nod)); | |
7d20685d | 9457 | |
d9f6a4ee | 9458 | when N_Slice => |
9459 | Check_Expr_Constants (Prefix (Nod)); | |
9460 | Check_Expr_Constants (Discrete_Range (Nod)); | |
cb4c311d | 9461 | |
d9f6a4ee | 9462 | when N_Selected_Component => |
9463 | Check_Expr_Constants (Prefix (Nod)); | |
6144c105 | 9464 | |
d9f6a4ee | 9465 | when N_Attribute_Reference => |
9466 | if Nam_In (Attribute_Name (Nod), Name_Address, | |
9467 | Name_Access, | |
9468 | Name_Unchecked_Access, | |
9469 | Name_Unrestricted_Access) | |
9470 | then | |
9471 | Check_At_Constant_Address (Prefix (Nod)); | |
6144c105 | 9472 | |
d9f6a4ee | 9473 | else |
9474 | Check_Expr_Constants (Prefix (Nod)); | |
9475 | Check_List_Constants (Expressions (Nod)); | |
9476 | end if; | |
a7a4a7c2 | 9477 | |
d9f6a4ee | 9478 | when N_Aggregate => |
9479 | Check_List_Constants (Component_Associations (Nod)); | |
9480 | Check_List_Constants (Expressions (Nod)); | |
7d20685d | 9481 | |
d9f6a4ee | 9482 | when N_Component_Association => |
9483 | Check_Expr_Constants (Expression (Nod)); | |
e1cedbae | 9484 | |
d9f6a4ee | 9485 | when N_Extension_Aggregate => |
9486 | Check_Expr_Constants (Ancestor_Part (Nod)); | |
9487 | Check_List_Constants (Component_Associations (Nod)); | |
9488 | Check_List_Constants (Expressions (Nod)); | |
3cdbaa5a | 9489 | |
d9f6a4ee | 9490 | when N_Null => |
9491 | return; | |
3cdbaa5a | 9492 | |
d9f6a4ee | 9493 | when N_Binary_Op | N_Short_Circuit | N_Membership_Test => |
9494 | Check_Expr_Constants (Left_Opnd (Nod)); | |
9495 | Check_Expr_Constants (Right_Opnd (Nod)); | |
e1cedbae | 9496 | |
d9f6a4ee | 9497 | when N_Unary_Op => |
9498 | Check_Expr_Constants (Right_Opnd (Nod)); | |
7f694ca2 | 9499 | |
d9f6a4ee | 9500 | when N_Type_Conversion | |
9501 | N_Qualified_Expression | | |
9502 | N_Allocator | | |
9503 | N_Unchecked_Type_Conversion => | |
9504 | Check_Expr_Constants (Expression (Nod)); | |
47a46747 | 9505 | |
d9f6a4ee | 9506 | when N_Function_Call => |
9507 | if not Is_Pure (Entity (Name (Nod))) then | |
9508 | Error_Msg_NE | |
9509 | ("invalid address clause for initialized object &!", | |
9510 | Nod, U_Ent); | |
7f694ca2 | 9511 | |
d9f6a4ee | 9512 | Error_Msg_NE |
9513 | ("\function & is not pure (RM 13.1(22))!", | |
9514 | Nod, Entity (Name (Nod))); | |
b55f7641 | 9515 | |
d9f6a4ee | 9516 | else |
9517 | Check_List_Constants (Parameter_Associations (Nod)); | |
9518 | end if; | |
b55f7641 | 9519 | |
d9f6a4ee | 9520 | when N_Parameter_Association => |
9521 | Check_Expr_Constants (Explicit_Actual_Parameter (Nod)); | |
7d20685d | 9522 | |
d9f6a4ee | 9523 | when others => |
9524 | Error_Msg_NE | |
9525 | ("invalid address clause for initialized object &!", | |
9526 | Nod, U_Ent); | |
9527 | Error_Msg_NE | |
9528 | ("\must be constant defined before& (RM 13.1(22))!", | |
9529 | Nod, U_Ent); | |
9530 | end case; | |
9531 | end Check_Expr_Constants; | |
7d20685d | 9532 | |
d9f6a4ee | 9533 | -------------------------- |
9534 | -- Check_List_Constants -- | |
9535 | -------------------------- | |
89f1e35c | 9536 | |
d9f6a4ee | 9537 | procedure Check_List_Constants (Lst : List_Id) is |
9538 | Nod1 : Node_Id; | |
7d20685d | 9539 | |
d9f6a4ee | 9540 | begin |
9541 | if Present (Lst) then | |
9542 | Nod1 := First (Lst); | |
9543 | while Present (Nod1) loop | |
9544 | Check_Expr_Constants (Nod1); | |
9545 | Next (Nod1); | |
9546 | end loop; | |
9547 | end if; | |
9548 | end Check_List_Constants; | |
81b424ac | 9549 | |
d9f6a4ee | 9550 | -- Start of processing for Check_Constant_Address_Clause |
81b424ac | 9551 | |
d9f6a4ee | 9552 | begin |
9553 | -- If rep_clauses are to be ignored, no need for legality checks. In | |
9c7948d7 | 9554 | -- particular, no need to pester user about rep clauses that violate the |
9555 | -- rule on constant addresses, given that these clauses will be removed | |
9556 | -- by Freeze before they reach the back end. Similarly in CodePeer mode, | |
9557 | -- we want to relax these checks. | |
7d20685d | 9558 | |
f1a9be43 | 9559 | if not Ignore_Rep_Clauses and not CodePeer_Mode then |
d9f6a4ee | 9560 | Check_Expr_Constants (Expr); |
9561 | end if; | |
9562 | end Check_Constant_Address_Clause; | |
7d20685d | 9563 | |
6653b695 | 9564 | --------------------------- |
9565 | -- Check_Pool_Size_Clash -- | |
9566 | --------------------------- | |
9567 | ||
9568 | procedure Check_Pool_Size_Clash (Ent : Entity_Id; SP, SS : Node_Id) is | |
9569 | Post : Node_Id; | |
9570 | ||
9571 | begin | |
9572 | -- We need to find out which one came first. Note that in the case of | |
9573 | -- aspects mixed with pragmas there are cases where the processing order | |
9574 | -- is reversed, which is why we do the check here. | |
9575 | ||
9576 | if Sloc (SP) < Sloc (SS) then | |
9577 | Error_Msg_Sloc := Sloc (SP); | |
9578 | Post := SS; | |
9579 | Error_Msg_NE ("Storage_Pool previously given for&#", Post, Ent); | |
9580 | ||
9581 | else | |
9582 | Error_Msg_Sloc := Sloc (SS); | |
9583 | Post := SP; | |
9584 | Error_Msg_NE ("Storage_Size previously given for&#", Post, Ent); | |
9585 | end if; | |
9586 | ||
9587 | Error_Msg_N | |
9588 | ("\cannot have Storage_Size and Storage_Pool (RM 13.11(3))", Post); | |
9589 | end Check_Pool_Size_Clash; | |
9590 | ||
d9f6a4ee | 9591 | ---------------------------------------- |
9592 | -- Check_Record_Representation_Clause -- | |
9593 | ---------------------------------------- | |
85696508 | 9594 | |
d9f6a4ee | 9595 | procedure Check_Record_Representation_Clause (N : Node_Id) is |
9596 | Loc : constant Source_Ptr := Sloc (N); | |
9597 | Ident : constant Node_Id := Identifier (N); | |
9598 | Rectype : Entity_Id; | |
9599 | Fent : Entity_Id; | |
9600 | CC : Node_Id; | |
9601 | Fbit : Uint; | |
9602 | Lbit : Uint; | |
9603 | Hbit : Uint := Uint_0; | |
9604 | Comp : Entity_Id; | |
9605 | Pcomp : Entity_Id; | |
89f1e35c | 9606 | |
d9f6a4ee | 9607 | Max_Bit_So_Far : Uint; |
9608 | -- Records the maximum bit position so far. If all field positions | |
9609 | -- are monotonically increasing, then we can skip the circuit for | |
9610 | -- checking for overlap, since no overlap is possible. | |
85696508 | 9611 | |
d9f6a4ee | 9612 | Tagged_Parent : Entity_Id := Empty; |
9613 | -- This is set in the case of a derived tagged type for which we have | |
9614 | -- Is_Fully_Repped_Tagged_Type True (indicating that all components are | |
9615 | -- positioned by record representation clauses). In this case we must | |
9616 | -- check for overlap between components of this tagged type, and the | |
9617 | -- components of its parent. Tagged_Parent will point to this parent | |
9618 | -- type. For all other cases Tagged_Parent is left set to Empty. | |
7d20685d | 9619 | |
d9f6a4ee | 9620 | Parent_Last_Bit : Uint; |
9621 | -- Relevant only if Tagged_Parent is set, Parent_Last_Bit indicates the | |
9622 | -- last bit position for any field in the parent type. We only need to | |
9623 | -- check overlap for fields starting below this point. | |
7d20685d | 9624 | |
d9f6a4ee | 9625 | Overlap_Check_Required : Boolean; |
9626 | -- Used to keep track of whether or not an overlap check is required | |
7d20685d | 9627 | |
d9f6a4ee | 9628 | Overlap_Detected : Boolean := False; |
9629 | -- Set True if an overlap is detected | |
d6f39728 | 9630 | |
d9f6a4ee | 9631 | Ccount : Natural := 0; |
9632 | -- Number of component clauses in record rep clause | |
d6f39728 | 9633 | |
d9f6a4ee | 9634 | procedure Check_Component_Overlap (C1_Ent, C2_Ent : Entity_Id); |
9635 | -- Given two entities for record components or discriminants, checks | |
9636 | -- if they have overlapping component clauses and issues errors if so. | |
d6f39728 | 9637 | |
d9f6a4ee | 9638 | procedure Find_Component; |
9639 | -- Finds component entity corresponding to current component clause (in | |
9640 | -- CC), and sets Comp to the entity, and Fbit/Lbit to the zero origin | |
9641 | -- start/stop bits for the field. If there is no matching component or | |
9642 | -- if the matching component does not have a component clause, then | |
9643 | -- that's an error and Comp is set to Empty, but no error message is | |
9644 | -- issued, since the message was already given. Comp is also set to | |
9645 | -- Empty if the current "component clause" is in fact a pragma. | |
d6f39728 | 9646 | |
d9f6a4ee | 9647 | ----------------------------- |
9648 | -- Check_Component_Overlap -- | |
9649 | ----------------------------- | |
9650 | ||
9651 | procedure Check_Component_Overlap (C1_Ent, C2_Ent : Entity_Id) is | |
9652 | CC1 : constant Node_Id := Component_Clause (C1_Ent); | |
9653 | CC2 : constant Node_Id := Component_Clause (C2_Ent); | |
d6f39728 | 9654 | |
d6f39728 | 9655 | begin |
d9f6a4ee | 9656 | if Present (CC1) and then Present (CC2) then |
d6f39728 | 9657 | |
d9f6a4ee | 9658 | -- Exclude odd case where we have two tag components in the same |
9659 | -- record, both at location zero. This seems a bit strange, but | |
9660 | -- it seems to happen in some circumstances, perhaps on an error. | |
9661 | ||
9662 | if Nam_In (Chars (C1_Ent), Name_uTag, Name_uTag) then | |
9663 | return; | |
d6f39728 | 9664 | end if; |
9665 | ||
d9f6a4ee | 9666 | -- Here we check if the two fields overlap |
9667 | ||
d6f39728 | 9668 | declare |
d9f6a4ee | 9669 | S1 : constant Uint := Component_Bit_Offset (C1_Ent); |
9670 | S2 : constant Uint := Component_Bit_Offset (C2_Ent); | |
9671 | E1 : constant Uint := S1 + Esize (C1_Ent); | |
9672 | E2 : constant Uint := S2 + Esize (C2_Ent); | |
d6f39728 | 9673 | |
9674 | begin | |
d9f6a4ee | 9675 | if E2 <= S1 or else E1 <= S2 then |
9676 | null; | |
d6f39728 | 9677 | else |
d9f6a4ee | 9678 | Error_Msg_Node_2 := Component_Name (CC2); |
9679 | Error_Msg_Sloc := Sloc (Error_Msg_Node_2); | |
9680 | Error_Msg_Node_1 := Component_Name (CC1); | |
9681 | Error_Msg_N | |
9682 | ("component& overlaps & #", Component_Name (CC1)); | |
9683 | Overlap_Detected := True; | |
d6f39728 | 9684 | end if; |
9685 | end; | |
d6f39728 | 9686 | end if; |
d9f6a4ee | 9687 | end Check_Component_Overlap; |
d6f39728 | 9688 | |
d9f6a4ee | 9689 | -------------------- |
9690 | -- Find_Component -- | |
9691 | -------------------- | |
9dfe12ae | 9692 | |
d9f6a4ee | 9693 | procedure Find_Component is |
9dfe12ae | 9694 | |
d9f6a4ee | 9695 | procedure Search_Component (R : Entity_Id); |
9696 | -- Search components of R for a match. If found, Comp is set | |
9dfe12ae | 9697 | |
d9f6a4ee | 9698 | ---------------------- |
9699 | -- Search_Component -- | |
9700 | ---------------------- | |
e7b2d6bc | 9701 | |
d9f6a4ee | 9702 | procedure Search_Component (R : Entity_Id) is |
9703 | begin | |
9704 | Comp := First_Component_Or_Discriminant (R); | |
9705 | while Present (Comp) loop | |
e7b2d6bc | 9706 | |
d9f6a4ee | 9707 | -- Ignore error of attribute name for component name (we |
9708 | -- already gave an error message for this, so no need to | |
9709 | -- complain here) | |
e7b2d6bc | 9710 | |
d9f6a4ee | 9711 | if Nkind (Component_Name (CC)) = N_Attribute_Reference then |
9712 | null; | |
9713 | else | |
9714 | exit when Chars (Comp) = Chars (Component_Name (CC)); | |
9dfe12ae | 9715 | end if; |
9716 | ||
d9f6a4ee | 9717 | Next_Component_Or_Discriminant (Comp); |
9718 | end loop; | |
9719 | end Search_Component; | |
d6f39728 | 9720 | |
d9f6a4ee | 9721 | -- Start of processing for Find_Component |
d6f39728 | 9722 | |
d9f6a4ee | 9723 | begin |
9724 | -- Return with Comp set to Empty if we have a pragma | |
d6f39728 | 9725 | |
d9f6a4ee | 9726 | if Nkind (CC) = N_Pragma then |
9727 | Comp := Empty; | |
9728 | return; | |
9729 | end if; | |
d6f39728 | 9730 | |
d9f6a4ee | 9731 | -- Search current record for matching component |
d6f39728 | 9732 | |
d9f6a4ee | 9733 | Search_Component (Rectype); |
9dfe12ae | 9734 | |
d9f6a4ee | 9735 | -- If not found, maybe component of base type discriminant that is |
9736 | -- absent from statically constrained first subtype. | |
e7b2d6bc | 9737 | |
d9f6a4ee | 9738 | if No (Comp) then |
9739 | Search_Component (Base_Type (Rectype)); | |
9740 | end if; | |
e7b2d6bc | 9741 | |
d9f6a4ee | 9742 | -- If no component, or the component does not reference the component |
9743 | -- clause in question, then there was some previous error for which | |
9744 | -- we already gave a message, so just return with Comp Empty. | |
d6f39728 | 9745 | |
d9f6a4ee | 9746 | if No (Comp) or else Component_Clause (Comp) /= CC then |
9747 | Check_Error_Detected; | |
9748 | Comp := Empty; | |
93735cb8 | 9749 | |
d9f6a4ee | 9750 | -- Normal case where we have a component clause |
93735cb8 | 9751 | |
d9f6a4ee | 9752 | else |
9753 | Fbit := Component_Bit_Offset (Comp); | |
9754 | Lbit := Fbit + Esize (Comp) - 1; | |
9755 | end if; | |
9756 | end Find_Component; | |
93735cb8 | 9757 | |
d9f6a4ee | 9758 | -- Start of processing for Check_Record_Representation_Clause |
d6f39728 | 9759 | |
d9f6a4ee | 9760 | begin |
9761 | Find_Type (Ident); | |
9762 | Rectype := Entity (Ident); | |
d6f39728 | 9763 | |
d9f6a4ee | 9764 | if Rectype = Any_Type then |
9765 | return; | |
9766 | else | |
9767 | Rectype := Underlying_Type (Rectype); | |
9768 | end if; | |
d6f39728 | 9769 | |
d9f6a4ee | 9770 | -- See if we have a fully repped derived tagged type |
d6f39728 | 9771 | |
d9f6a4ee | 9772 | declare |
9773 | PS : constant Entity_Id := Parent_Subtype (Rectype); | |
d6f39728 | 9774 | |
d9f6a4ee | 9775 | begin |
9776 | if Present (PS) and then Is_Fully_Repped_Tagged_Type (PS) then | |
9777 | Tagged_Parent := PS; | |
d6f39728 | 9778 | |
d9f6a4ee | 9779 | -- Find maximum bit of any component of the parent type |
d6f39728 | 9780 | |
d9f6a4ee | 9781 | Parent_Last_Bit := UI_From_Int (System_Address_Size - 1); |
9782 | Pcomp := First_Entity (Tagged_Parent); | |
9783 | while Present (Pcomp) loop | |
9784 | if Ekind_In (Pcomp, E_Discriminant, E_Component) then | |
9785 | if Component_Bit_Offset (Pcomp) /= No_Uint | |
9786 | and then Known_Static_Esize (Pcomp) | |
9787 | then | |
9788 | Parent_Last_Bit := | |
9789 | UI_Max | |
9790 | (Parent_Last_Bit, | |
9791 | Component_Bit_Offset (Pcomp) + Esize (Pcomp) - 1); | |
9792 | end if; | |
9793 | ||
9794 | Next_Entity (Pcomp); | |
d6f39728 | 9795 | end if; |
d9f6a4ee | 9796 | end loop; |
9797 | end if; | |
9798 | end; | |
d6f39728 | 9799 | |
d9f6a4ee | 9800 | -- All done if no component clauses |
d6f39728 | 9801 | |
d9f6a4ee | 9802 | CC := First (Component_Clauses (N)); |
d6f39728 | 9803 | |
d9f6a4ee | 9804 | if No (CC) then |
9805 | return; | |
9806 | end if; | |
d6f39728 | 9807 | |
d9f6a4ee | 9808 | -- If a tag is present, then create a component clause that places it |
9809 | -- at the start of the record (otherwise gigi may place it after other | |
9810 | -- fields that have rep clauses). | |
d6f39728 | 9811 | |
d9f6a4ee | 9812 | Fent := First_Entity (Rectype); |
d6f39728 | 9813 | |
d9f6a4ee | 9814 | if Nkind (Fent) = N_Defining_Identifier |
9815 | and then Chars (Fent) = Name_uTag | |
9816 | then | |
9817 | Set_Component_Bit_Offset (Fent, Uint_0); | |
9818 | Set_Normalized_Position (Fent, Uint_0); | |
9819 | Set_Normalized_First_Bit (Fent, Uint_0); | |
9820 | Set_Normalized_Position_Max (Fent, Uint_0); | |
9821 | Init_Esize (Fent, System_Address_Size); | |
d6f39728 | 9822 | |
d9f6a4ee | 9823 | Set_Component_Clause (Fent, |
9824 | Make_Component_Clause (Loc, | |
9825 | Component_Name => Make_Identifier (Loc, Name_uTag), | |
d6f39728 | 9826 | |
d9f6a4ee | 9827 | Position => Make_Integer_Literal (Loc, Uint_0), |
9828 | First_Bit => Make_Integer_Literal (Loc, Uint_0), | |
9829 | Last_Bit => | |
9830 | Make_Integer_Literal (Loc, | |
9831 | UI_From_Int (System_Address_Size)))); | |
d6f39728 | 9832 | |
d9f6a4ee | 9833 | Ccount := Ccount + 1; |
9834 | end if; | |
d6f39728 | 9835 | |
d9f6a4ee | 9836 | Max_Bit_So_Far := Uint_Minus_1; |
9837 | Overlap_Check_Required := False; | |
d6f39728 | 9838 | |
d9f6a4ee | 9839 | -- Process the component clauses |
d6f39728 | 9840 | |
d9f6a4ee | 9841 | while Present (CC) loop |
9842 | Find_Component; | |
d6f39728 | 9843 | |
d9f6a4ee | 9844 | if Present (Comp) then |
9845 | Ccount := Ccount + 1; | |
d6f39728 | 9846 | |
d9f6a4ee | 9847 | -- We need a full overlap check if record positions non-monotonic |
d6f39728 | 9848 | |
d9f6a4ee | 9849 | if Fbit <= Max_Bit_So_Far then |
9850 | Overlap_Check_Required := True; | |
9851 | end if; | |
d6f39728 | 9852 | |
d9f6a4ee | 9853 | Max_Bit_So_Far := Lbit; |
d6f39728 | 9854 | |
d9f6a4ee | 9855 | -- Check bit position out of range of specified size |
01cb2726 | 9856 | |
d9f6a4ee | 9857 | if Has_Size_Clause (Rectype) |
9858 | and then RM_Size (Rectype) <= Lbit | |
9859 | then | |
9860 | Error_Msg_N | |
9861 | ("bit number out of range of specified size", | |
9862 | Last_Bit (CC)); | |
d6f39728 | 9863 | |
d9f6a4ee | 9864 | -- Check for overlap with tag component |
67278d60 | 9865 | |
d9f6a4ee | 9866 | else |
9867 | if Is_Tagged_Type (Rectype) | |
9868 | and then Fbit < System_Address_Size | |
9869 | then | |
9870 | Error_Msg_NE | |
9871 | ("component overlaps tag field of&", | |
9872 | Component_Name (CC), Rectype); | |
9873 | Overlap_Detected := True; | |
9874 | end if; | |
67278d60 | 9875 | |
d9f6a4ee | 9876 | if Hbit < Lbit then |
9877 | Hbit := Lbit; | |
9878 | end if; | |
9879 | end if; | |
67278d60 | 9880 | |
d9f6a4ee | 9881 | -- Check parent overlap if component might overlap parent field |
67278d60 | 9882 | |
d9f6a4ee | 9883 | if Present (Tagged_Parent) and then Fbit <= Parent_Last_Bit then |
9884 | Pcomp := First_Component_Or_Discriminant (Tagged_Parent); | |
9885 | while Present (Pcomp) loop | |
9886 | if not Is_Tag (Pcomp) | |
9887 | and then Chars (Pcomp) /= Name_uParent | |
9888 | then | |
9889 | Check_Component_Overlap (Comp, Pcomp); | |
9890 | end if; | |
67278d60 | 9891 | |
d9f6a4ee | 9892 | Next_Component_Or_Discriminant (Pcomp); |
9893 | end loop; | |
9894 | end if; | |
9895 | end if; | |
67278d60 | 9896 | |
d9f6a4ee | 9897 | Next (CC); |
9898 | end loop; | |
47495553 | 9899 | |
d9f6a4ee | 9900 | -- Now that we have processed all the component clauses, check for |
9901 | -- overlap. We have to leave this till last, since the components can | |
9902 | -- appear in any arbitrary order in the representation clause. | |
67278d60 | 9903 | |
d9f6a4ee | 9904 | -- We do not need this check if all specified ranges were monotonic, |
9905 | -- as recorded by Overlap_Check_Required being False at this stage. | |
67278d60 | 9906 | |
d9f6a4ee | 9907 | -- This first section checks if there are any overlapping entries at |
9908 | -- all. It does this by sorting all entries and then seeing if there are | |
9909 | -- any overlaps. If there are none, then that is decisive, but if there | |
9910 | -- are overlaps, they may still be OK (they may result from fields in | |
9911 | -- different variants). | |
67278d60 | 9912 | |
d9f6a4ee | 9913 | if Overlap_Check_Required then |
9914 | Overlap_Check1 : declare | |
67278d60 | 9915 | |
d9f6a4ee | 9916 | OC_Fbit : array (0 .. Ccount) of Uint; |
9917 | -- First-bit values for component clauses, the value is the offset | |
9918 | -- of the first bit of the field from start of record. The zero | |
9919 | -- entry is for use in sorting. | |
47495553 | 9920 | |
d9f6a4ee | 9921 | OC_Lbit : array (0 .. Ccount) of Uint; |
9922 | -- Last-bit values for component clauses, the value is the offset | |
9923 | -- of the last bit of the field from start of record. The zero | |
9924 | -- entry is for use in sorting. | |
9925 | ||
9926 | OC_Count : Natural := 0; | |
9927 | -- Count of entries in OC_Fbit and OC_Lbit | |
67278d60 | 9928 | |
d9f6a4ee | 9929 | function OC_Lt (Op1, Op2 : Natural) return Boolean; |
9930 | -- Compare routine for Sort | |
67278d60 | 9931 | |
d9f6a4ee | 9932 | procedure OC_Move (From : Natural; To : Natural); |
9933 | -- Move routine for Sort | |
67278d60 | 9934 | |
d9f6a4ee | 9935 | package Sorting is new GNAT.Heap_Sort_G (OC_Move, OC_Lt); |
67278d60 | 9936 | |
d9f6a4ee | 9937 | ----------- |
9938 | -- OC_Lt -- | |
9939 | ----------- | |
67278d60 | 9940 | |
d9f6a4ee | 9941 | function OC_Lt (Op1, Op2 : Natural) return Boolean is |
67278d60 | 9942 | begin |
d9f6a4ee | 9943 | return OC_Fbit (Op1) < OC_Fbit (Op2); |
9944 | end OC_Lt; | |
67278d60 | 9945 | |
d9f6a4ee | 9946 | ------------- |
9947 | -- OC_Move -- | |
9948 | ------------- | |
67278d60 | 9949 | |
d9f6a4ee | 9950 | procedure OC_Move (From : Natural; To : Natural) is |
9951 | begin | |
9952 | OC_Fbit (To) := OC_Fbit (From); | |
9953 | OC_Lbit (To) := OC_Lbit (From); | |
9954 | end OC_Move; | |
67278d60 | 9955 | |
d9f6a4ee | 9956 | -- Start of processing for Overlap_Check |
67278d60 | 9957 | |
67278d60 | 9958 | begin |
d9f6a4ee | 9959 | CC := First (Component_Clauses (N)); |
9960 | while Present (CC) loop | |
67278d60 | 9961 | |
d9f6a4ee | 9962 | -- Exclude component clause already marked in error |
67278d60 | 9963 | |
d9f6a4ee | 9964 | if not Error_Posted (CC) then |
9965 | Find_Component; | |
9966 | ||
9967 | if Present (Comp) then | |
9968 | OC_Count := OC_Count + 1; | |
9969 | OC_Fbit (OC_Count) := Fbit; | |
9970 | OC_Lbit (OC_Count) := Lbit; | |
9971 | end if; | |
67278d60 | 9972 | end if; |
9973 | ||
d9f6a4ee | 9974 | Next (CC); |
67278d60 | 9975 | end loop; |
67278d60 | 9976 | |
d9f6a4ee | 9977 | Sorting.Sort (OC_Count); |
67278d60 | 9978 | |
d9f6a4ee | 9979 | Overlap_Check_Required := False; |
9980 | for J in 1 .. OC_Count - 1 loop | |
9981 | if OC_Lbit (J) >= OC_Fbit (J + 1) then | |
9982 | Overlap_Check_Required := True; | |
9983 | exit; | |
9984 | end if; | |
9985 | end loop; | |
9986 | end Overlap_Check1; | |
9987 | end if; | |
67278d60 | 9988 | |
d9f6a4ee | 9989 | -- If Overlap_Check_Required is still True, then we have to do the full |
9990 | -- scale overlap check, since we have at least two fields that do | |
9991 | -- overlap, and we need to know if that is OK since they are in | |
9992 | -- different variant, or whether we have a definite problem. | |
67278d60 | 9993 | |
d9f6a4ee | 9994 | if Overlap_Check_Required then |
9995 | Overlap_Check2 : declare | |
9996 | C1_Ent, C2_Ent : Entity_Id; | |
9997 | -- Entities of components being checked for overlap | |
67278d60 | 9998 | |
d9f6a4ee | 9999 | Clist : Node_Id; |
10000 | -- Component_List node whose Component_Items are being checked | |
67278d60 | 10001 | |
d9f6a4ee | 10002 | Citem : Node_Id; |
10003 | -- Component declaration for component being checked | |
67278d60 | 10004 | |
d9f6a4ee | 10005 | begin |
10006 | C1_Ent := First_Entity (Base_Type (Rectype)); | |
67278d60 | 10007 | |
d9f6a4ee | 10008 | -- Loop through all components in record. For each component check |
10009 | -- for overlap with any of the preceding elements on the component | |
10010 | -- list containing the component and also, if the component is in | |
10011 | -- a variant, check against components outside the case structure. | |
10012 | -- This latter test is repeated recursively up the variant tree. | |
67278d60 | 10013 | |
d9f6a4ee | 10014 | Main_Component_Loop : while Present (C1_Ent) loop |
10015 | if not Ekind_In (C1_Ent, E_Component, E_Discriminant) then | |
10016 | goto Continue_Main_Component_Loop; | |
10017 | end if; | |
67278d60 | 10018 | |
d9f6a4ee | 10019 | -- Skip overlap check if entity has no declaration node. This |
10020 | -- happens with discriminants in constrained derived types. | |
10021 | -- Possibly we are missing some checks as a result, but that | |
10022 | -- does not seem terribly serious. | |
67278d60 | 10023 | |
d9f6a4ee | 10024 | if No (Declaration_Node (C1_Ent)) then |
10025 | goto Continue_Main_Component_Loop; | |
10026 | end if; | |
67278d60 | 10027 | |
d9f6a4ee | 10028 | Clist := Parent (List_Containing (Declaration_Node (C1_Ent))); |
67278d60 | 10029 | |
d9f6a4ee | 10030 | -- Loop through component lists that need checking. Check the |
10031 | -- current component list and all lists in variants above us. | |
67278d60 | 10032 | |
d9f6a4ee | 10033 | Component_List_Loop : loop |
67278d60 | 10034 | |
d9f6a4ee | 10035 | -- If derived type definition, go to full declaration |
10036 | -- If at outer level, check discriminants if there are any. | |
67278d60 | 10037 | |
d9f6a4ee | 10038 | if Nkind (Clist) = N_Derived_Type_Definition then |
10039 | Clist := Parent (Clist); | |
10040 | end if; | |
67278d60 | 10041 | |
d9f6a4ee | 10042 | -- Outer level of record definition, check discriminants |
67278d60 | 10043 | |
d9f6a4ee | 10044 | if Nkind_In (Clist, N_Full_Type_Declaration, |
10045 | N_Private_Type_Declaration) | |
67278d60 | 10046 | then |
d9f6a4ee | 10047 | if Has_Discriminants (Defining_Identifier (Clist)) then |
10048 | C2_Ent := | |
10049 | First_Discriminant (Defining_Identifier (Clist)); | |
10050 | while Present (C2_Ent) loop | |
10051 | exit when C1_Ent = C2_Ent; | |
10052 | Check_Component_Overlap (C1_Ent, C2_Ent); | |
10053 | Next_Discriminant (C2_Ent); | |
10054 | end loop; | |
10055 | end if; | |
67278d60 | 10056 | |
d9f6a4ee | 10057 | -- Record extension case |
67278d60 | 10058 | |
d9f6a4ee | 10059 | elsif Nkind (Clist) = N_Derived_Type_Definition then |
10060 | Clist := Empty; | |
67278d60 | 10061 | |
d9f6a4ee | 10062 | -- Otherwise check one component list |
67278d60 | 10063 | |
d9f6a4ee | 10064 | else |
10065 | Citem := First (Component_Items (Clist)); | |
10066 | while Present (Citem) loop | |
10067 | if Nkind (Citem) = N_Component_Declaration then | |
10068 | C2_Ent := Defining_Identifier (Citem); | |
10069 | exit when C1_Ent = C2_Ent; | |
10070 | Check_Component_Overlap (C1_Ent, C2_Ent); | |
10071 | end if; | |
67278d60 | 10072 | |
d9f6a4ee | 10073 | Next (Citem); |
10074 | end loop; | |
10075 | end if; | |
67278d60 | 10076 | |
d9f6a4ee | 10077 | -- Check for variants above us (the parent of the Clist can |
10078 | -- be a variant, in which case its parent is a variant part, | |
10079 | -- and the parent of the variant part is a component list | |
10080 | -- whose components must all be checked against the current | |
10081 | -- component for overlap). | |
67278d60 | 10082 | |
d9f6a4ee | 10083 | if Nkind (Parent (Clist)) = N_Variant then |
10084 | Clist := Parent (Parent (Parent (Clist))); | |
67278d60 | 10085 | |
d9f6a4ee | 10086 | -- Check for possible discriminant part in record, this |
10087 | -- is treated essentially as another level in the | |
10088 | -- recursion. For this case the parent of the component | |
10089 | -- list is the record definition, and its parent is the | |
10090 | -- full type declaration containing the discriminant | |
10091 | -- specifications. | |
10092 | ||
10093 | elsif Nkind (Parent (Clist)) = N_Record_Definition then | |
10094 | Clist := Parent (Parent ((Clist))); | |
10095 | ||
10096 | -- If neither of these two cases, we are at the top of | |
10097 | -- the tree. | |
10098 | ||
10099 | else | |
10100 | exit Component_List_Loop; | |
10101 | end if; | |
10102 | end loop Component_List_Loop; | |
67278d60 | 10103 | |
d9f6a4ee | 10104 | <<Continue_Main_Component_Loop>> |
10105 | Next_Entity (C1_Ent); | |
67278d60 | 10106 | |
d9f6a4ee | 10107 | end loop Main_Component_Loop; |
10108 | end Overlap_Check2; | |
67278d60 | 10109 | end if; |
10110 | ||
d9f6a4ee | 10111 | -- The following circuit deals with warning on record holes (gaps). We |
10112 | -- skip this check if overlap was detected, since it makes sense for the | |
10113 | -- programmer to fix this illegality before worrying about warnings. | |
67278d60 | 10114 | |
d9f6a4ee | 10115 | if not Overlap_Detected and Warn_On_Record_Holes then |
10116 | Record_Hole_Check : declare | |
10117 | Decl : constant Node_Id := Declaration_Node (Base_Type (Rectype)); | |
10118 | -- Full declaration of record type | |
67278d60 | 10119 | |
d9f6a4ee | 10120 | procedure Check_Component_List |
10121 | (CL : Node_Id; | |
10122 | Sbit : Uint; | |
10123 | DS : List_Id); | |
10124 | -- Check component list CL for holes. The starting bit should be | |
10125 | -- Sbit. which is zero for the main record component list and set | |
10126 | -- appropriately for recursive calls for variants. DS is set to | |
10127 | -- a list of discriminant specifications to be included in the | |
10128 | -- consideration of components. It is No_List if none to consider. | |
67278d60 | 10129 | |
d9f6a4ee | 10130 | -------------------------- |
10131 | -- Check_Component_List -- | |
10132 | -------------------------- | |
47495553 | 10133 | |
d9f6a4ee | 10134 | procedure Check_Component_List |
10135 | (CL : Node_Id; | |
10136 | Sbit : Uint; | |
10137 | DS : List_Id) | |
10138 | is | |
10139 | Compl : Integer; | |
67278d60 | 10140 | |
d9f6a4ee | 10141 | begin |
10142 | Compl := Integer (List_Length (Component_Items (CL))); | |
47495553 | 10143 | |
d9f6a4ee | 10144 | if DS /= No_List then |
10145 | Compl := Compl + Integer (List_Length (DS)); | |
10146 | end if; | |
67278d60 | 10147 | |
d9f6a4ee | 10148 | declare |
10149 | Comps : array (Natural range 0 .. Compl) of Entity_Id; | |
10150 | -- Gather components (zero entry is for sort routine) | |
67278d60 | 10151 | |
d9f6a4ee | 10152 | Ncomps : Natural := 0; |
10153 | -- Number of entries stored in Comps (starting at Comps (1)) | |
67278d60 | 10154 | |
d9f6a4ee | 10155 | Citem : Node_Id; |
10156 | -- One component item or discriminant specification | |
67278d60 | 10157 | |
d9f6a4ee | 10158 | Nbit : Uint; |
10159 | -- Starting bit for next component | |
67278d60 | 10160 | |
d9f6a4ee | 10161 | CEnt : Entity_Id; |
10162 | -- Component entity | |
67278d60 | 10163 | |
d9f6a4ee | 10164 | Variant : Node_Id; |
10165 | -- One variant | |
67278d60 | 10166 | |
d9f6a4ee | 10167 | function Lt (Op1, Op2 : Natural) return Boolean; |
10168 | -- Compare routine for Sort | |
67278d60 | 10169 | |
d9f6a4ee | 10170 | procedure Move (From : Natural; To : Natural); |
10171 | -- Move routine for Sort | |
67278d60 | 10172 | |
d9f6a4ee | 10173 | package Sorting is new GNAT.Heap_Sort_G (Move, Lt); |
67278d60 | 10174 | |
d9f6a4ee | 10175 | -------- |
10176 | -- Lt -- | |
10177 | -------- | |
67278d60 | 10178 | |
d9f6a4ee | 10179 | function Lt (Op1, Op2 : Natural) return Boolean is |
10180 | begin | |
10181 | return Component_Bit_Offset (Comps (Op1)) | |
10182 | < | |
10183 | Component_Bit_Offset (Comps (Op2)); | |
10184 | end Lt; | |
67278d60 | 10185 | |
d9f6a4ee | 10186 | ---------- |
10187 | -- Move -- | |
10188 | ---------- | |
67278d60 | 10189 | |
d9f6a4ee | 10190 | procedure Move (From : Natural; To : Natural) is |
10191 | begin | |
10192 | Comps (To) := Comps (From); | |
10193 | end Move; | |
67278d60 | 10194 | |
d9f6a4ee | 10195 | begin |
10196 | -- Gather discriminants into Comp | |
67278d60 | 10197 | |
d9f6a4ee | 10198 | if DS /= No_List then |
10199 | Citem := First (DS); | |
10200 | while Present (Citem) loop | |
10201 | if Nkind (Citem) = N_Discriminant_Specification then | |
10202 | declare | |
10203 | Ent : constant Entity_Id := | |
10204 | Defining_Identifier (Citem); | |
10205 | begin | |
10206 | if Ekind (Ent) = E_Discriminant then | |
10207 | Ncomps := Ncomps + 1; | |
10208 | Comps (Ncomps) := Ent; | |
10209 | end if; | |
10210 | end; | |
10211 | end if; | |
67278d60 | 10212 | |
d9f6a4ee | 10213 | Next (Citem); |
10214 | end loop; | |
10215 | end if; | |
67278d60 | 10216 | |
d9f6a4ee | 10217 | -- Gather component entities into Comp |
67278d60 | 10218 | |
d9f6a4ee | 10219 | Citem := First (Component_Items (CL)); |
10220 | while Present (Citem) loop | |
10221 | if Nkind (Citem) = N_Component_Declaration then | |
10222 | Ncomps := Ncomps + 1; | |
10223 | Comps (Ncomps) := Defining_Identifier (Citem); | |
10224 | end if; | |
67278d60 | 10225 | |
d9f6a4ee | 10226 | Next (Citem); |
10227 | end loop; | |
67278d60 | 10228 | |
d9f6a4ee | 10229 | -- Now sort the component entities based on the first bit. |
10230 | -- Note we already know there are no overlapping components. | |
67278d60 | 10231 | |
d9f6a4ee | 10232 | Sorting.Sort (Ncomps); |
67278d60 | 10233 | |
d9f6a4ee | 10234 | -- Loop through entries checking for holes |
67278d60 | 10235 | |
d9f6a4ee | 10236 | Nbit := Sbit; |
10237 | for J in 1 .. Ncomps loop | |
10238 | CEnt := Comps (J); | |
10239 | Error_Msg_Uint_1 := Component_Bit_Offset (CEnt) - Nbit; | |
67278d60 | 10240 | |
d9f6a4ee | 10241 | if Error_Msg_Uint_1 > 0 then |
10242 | Error_Msg_NE | |
10243 | ("?H?^-bit gap before component&", | |
10244 | Component_Name (Component_Clause (CEnt)), CEnt); | |
10245 | end if; | |
67278d60 | 10246 | |
d9f6a4ee | 10247 | Nbit := Component_Bit_Offset (CEnt) + Esize (CEnt); |
10248 | end loop; | |
67278d60 | 10249 | |
d9f6a4ee | 10250 | -- Process variant parts recursively if present |
67278d60 | 10251 | |
d9f6a4ee | 10252 | if Present (Variant_Part (CL)) then |
10253 | Variant := First (Variants (Variant_Part (CL))); | |
10254 | while Present (Variant) loop | |
10255 | Check_Component_List | |
10256 | (Component_List (Variant), Nbit, No_List); | |
10257 | Next (Variant); | |
10258 | end loop; | |
67278d60 | 10259 | end if; |
d9f6a4ee | 10260 | end; |
10261 | end Check_Component_List; | |
67278d60 | 10262 | |
d9f6a4ee | 10263 | -- Start of processing for Record_Hole_Check |
67278d60 | 10264 | |
d9f6a4ee | 10265 | begin |
10266 | declare | |
10267 | Sbit : Uint; | |
67278d60 | 10268 | |
d9f6a4ee | 10269 | begin |
10270 | if Is_Tagged_Type (Rectype) then | |
10271 | Sbit := UI_From_Int (System_Address_Size); | |
10272 | else | |
10273 | Sbit := Uint_0; | |
10274 | end if; | |
10275 | ||
10276 | if Nkind (Decl) = N_Full_Type_Declaration | |
10277 | and then Nkind (Type_Definition (Decl)) = N_Record_Definition | |
10278 | then | |
10279 | Check_Component_List | |
10280 | (Component_List (Type_Definition (Decl)), | |
10281 | Sbit, | |
10282 | Discriminant_Specifications (Decl)); | |
67278d60 | 10283 | end if; |
d9f6a4ee | 10284 | end; |
10285 | end Record_Hole_Check; | |
67278d60 | 10286 | end if; |
10287 | ||
d9f6a4ee | 10288 | -- For records that have component clauses for all components, and whose |
10289 | -- size is less than or equal to 32, we need to know the size in the | |
10290 | -- front end to activate possible packed array processing where the | |
10291 | -- component type is a record. | |
67278d60 | 10292 | |
d9f6a4ee | 10293 | -- At this stage Hbit + 1 represents the first unused bit from all the |
10294 | -- component clauses processed, so if the component clauses are | |
10295 | -- complete, then this is the length of the record. | |
67278d60 | 10296 | |
d9f6a4ee | 10297 | -- For records longer than System.Storage_Unit, and for those where not |
10298 | -- all components have component clauses, the back end determines the | |
10299 | -- length (it may for example be appropriate to round up the size | |
10300 | -- to some convenient boundary, based on alignment considerations, etc). | |
67278d60 | 10301 | |
d9f6a4ee | 10302 | if Unknown_RM_Size (Rectype) and then Hbit + 1 <= 32 then |
67278d60 | 10303 | |
d9f6a4ee | 10304 | -- Nothing to do if at least one component has no component clause |
67278d60 | 10305 | |
d9f6a4ee | 10306 | Comp := First_Component_Or_Discriminant (Rectype); |
10307 | while Present (Comp) loop | |
10308 | exit when No (Component_Clause (Comp)); | |
10309 | Next_Component_Or_Discriminant (Comp); | |
10310 | end loop; | |
67278d60 | 10311 | |
d9f6a4ee | 10312 | -- If we fall out of loop, all components have component clauses |
10313 | -- and so we can set the size to the maximum value. | |
67278d60 | 10314 | |
d9f6a4ee | 10315 | if No (Comp) then |
10316 | Set_RM_Size (Rectype, Hbit + 1); | |
10317 | end if; | |
10318 | end if; | |
10319 | end Check_Record_Representation_Clause; | |
67278d60 | 10320 | |
d9f6a4ee | 10321 | ---------------- |
10322 | -- Check_Size -- | |
10323 | ---------------- | |
67278d60 | 10324 | |
d9f6a4ee | 10325 | procedure Check_Size |
10326 | (N : Node_Id; | |
10327 | T : Entity_Id; | |
10328 | Siz : Uint; | |
10329 | Biased : out Boolean) | |
10330 | is | |
10331 | UT : constant Entity_Id := Underlying_Type (T); | |
10332 | M : Uint; | |
67278d60 | 10333 | |
d9f6a4ee | 10334 | begin |
10335 | Biased := False; | |
67278d60 | 10336 | |
d9f6a4ee | 10337 | -- Reject patently improper size values. |
67278d60 | 10338 | |
d9f6a4ee | 10339 | if Is_Elementary_Type (T) |
10340 | and then Siz > UI_From_Int (Int'Last) | |
10341 | then | |
10342 | Error_Msg_N ("Size value too large for elementary type", N); | |
67278d60 | 10343 | |
d9f6a4ee | 10344 | if Nkind (Original_Node (N)) = N_Op_Expon then |
10345 | Error_Msg_N | |
10346 | ("\maybe '* was meant, rather than '*'*", Original_Node (N)); | |
10347 | end if; | |
10348 | end if; | |
67278d60 | 10349 | |
d9f6a4ee | 10350 | -- Dismiss generic types |
67278d60 | 10351 | |
d9f6a4ee | 10352 | if Is_Generic_Type (T) |
10353 | or else | |
10354 | Is_Generic_Type (UT) | |
10355 | or else | |
10356 | Is_Generic_Type (Root_Type (UT)) | |
10357 | then | |
10358 | return; | |
67278d60 | 10359 | |
d9f6a4ee | 10360 | -- Guard against previous errors |
67278d60 | 10361 | |
d9f6a4ee | 10362 | elsif No (UT) or else UT = Any_Type then |
10363 | Check_Error_Detected; | |
10364 | return; | |
67278d60 | 10365 | |
d9f6a4ee | 10366 | -- Check case of bit packed array |
67278d60 | 10367 | |
d9f6a4ee | 10368 | elsif Is_Array_Type (UT) |
10369 | and then Known_Static_Component_Size (UT) | |
10370 | and then Is_Bit_Packed_Array (UT) | |
10371 | then | |
10372 | declare | |
10373 | Asiz : Uint; | |
10374 | Indx : Node_Id; | |
10375 | Ityp : Entity_Id; | |
67278d60 | 10376 | |
d9f6a4ee | 10377 | begin |
10378 | Asiz := Component_Size (UT); | |
10379 | Indx := First_Index (UT); | |
10380 | loop | |
10381 | Ityp := Etype (Indx); | |
67278d60 | 10382 | |
d9f6a4ee | 10383 | -- If non-static bound, then we are not in the business of |
10384 | -- trying to check the length, and indeed an error will be | |
10385 | -- issued elsewhere, since sizes of non-static array types | |
10386 | -- cannot be set implicitly or explicitly. | |
67278d60 | 10387 | |
cda40848 | 10388 | if not Is_OK_Static_Subtype (Ityp) then |
d9f6a4ee | 10389 | return; |
10390 | end if; | |
67278d60 | 10391 | |
d9f6a4ee | 10392 | -- Otherwise accumulate next dimension |
67278d60 | 10393 | |
d9f6a4ee | 10394 | Asiz := Asiz * (Expr_Value (Type_High_Bound (Ityp)) - |
10395 | Expr_Value (Type_Low_Bound (Ityp)) + | |
10396 | Uint_1); | |
67278d60 | 10397 | |
d9f6a4ee | 10398 | Next_Index (Indx); |
10399 | exit when No (Indx); | |
10400 | end loop; | |
67278d60 | 10401 | |
d9f6a4ee | 10402 | if Asiz <= Siz then |
10403 | return; | |
67278d60 | 10404 | |
d9f6a4ee | 10405 | else |
10406 | Error_Msg_Uint_1 := Asiz; | |
10407 | Error_Msg_NE | |
10408 | ("size for& too small, minimum allowed is ^", N, T); | |
10409 | Set_Esize (T, Asiz); | |
10410 | Set_RM_Size (T, Asiz); | |
10411 | end if; | |
10412 | end; | |
67278d60 | 10413 | |
d9f6a4ee | 10414 | -- All other composite types are ignored |
67278d60 | 10415 | |
d9f6a4ee | 10416 | elsif Is_Composite_Type (UT) then |
10417 | return; | |
47495553 | 10418 | |
d9f6a4ee | 10419 | -- For fixed-point types, don't check minimum if type is not frozen, |
10420 | -- since we don't know all the characteristics of the type that can | |
10421 | -- affect the size (e.g. a specified small) till freeze time. | |
47495553 | 10422 | |
d9f6a4ee | 10423 | elsif Is_Fixed_Point_Type (UT) |
10424 | and then not Is_Frozen (UT) | |
10425 | then | |
10426 | null; | |
47495553 | 10427 | |
d9f6a4ee | 10428 | -- Cases for which a minimum check is required |
47495553 | 10429 | |
d9f6a4ee | 10430 | else |
10431 | -- Ignore if specified size is correct for the type | |
47495553 | 10432 | |
d9f6a4ee | 10433 | if Known_Esize (UT) and then Siz = Esize (UT) then |
10434 | return; | |
10435 | end if; | |
47495553 | 10436 | |
d9f6a4ee | 10437 | -- Otherwise get minimum size |
47495553 | 10438 | |
d9f6a4ee | 10439 | M := UI_From_Int (Minimum_Size (UT)); |
47495553 | 10440 | |
d9f6a4ee | 10441 | if Siz < M then |
47495553 | 10442 | |
d9f6a4ee | 10443 | -- Size is less than minimum size, but one possibility remains |
10444 | -- that we can manage with the new size if we bias the type. | |
47495553 | 10445 | |
d9f6a4ee | 10446 | M := UI_From_Int (Minimum_Size (UT, Biased => True)); |
47495553 | 10447 | |
d9f6a4ee | 10448 | if Siz < M then |
10449 | Error_Msg_Uint_1 := M; | |
10450 | Error_Msg_NE | |
10451 | ("size for& too small, minimum allowed is ^", N, T); | |
10452 | Set_Esize (T, M); | |
10453 | Set_RM_Size (T, M); | |
10454 | else | |
10455 | Biased := True; | |
10456 | end if; | |
10457 | end if; | |
10458 | end if; | |
10459 | end Check_Size; | |
47495553 | 10460 | |
d9f6a4ee | 10461 | -------------------------- |
10462 | -- Freeze_Entity_Checks -- | |
10463 | -------------------------- | |
47495553 | 10464 | |
d9f6a4ee | 10465 | procedure Freeze_Entity_Checks (N : Node_Id) is |
8cf481c9 | 10466 | procedure Hide_Non_Overridden_Subprograms (Typ : Entity_Id); |
10467 | -- Inspect the primitive operations of type Typ and hide all pairs of | |
3118058b | 10468 | -- implicitly declared non-overridden non-fully conformant homographs |
10469 | -- (Ada RM 8.3 12.3/2). | |
8cf481c9 | 10470 | |
10471 | ------------------------------------- | |
10472 | -- Hide_Non_Overridden_Subprograms -- | |
10473 | ------------------------------------- | |
10474 | ||
10475 | procedure Hide_Non_Overridden_Subprograms (Typ : Entity_Id) is | |
10476 | procedure Hide_Matching_Homographs | |
10477 | (Subp_Id : Entity_Id; | |
10478 | Start_Elmt : Elmt_Id); | |
10479 | -- Inspect a list of primitive operations starting with Start_Elmt | |
3118058b | 10480 | -- and find matching implicitly declared non-overridden non-fully |
10481 | -- conformant homographs of Subp_Id. If found, all matches along | |
10482 | -- with Subp_Id are hidden from all visibility. | |
8cf481c9 | 10483 | |
10484 | function Is_Non_Overridden_Or_Null_Procedure | |
10485 | (Subp_Id : Entity_Id) return Boolean; | |
10486 | -- Determine whether subprogram Subp_Id is implicitly declared non- | |
10487 | -- overridden subprogram or an implicitly declared null procedure. | |
10488 | ||
10489 | ------------------------------ | |
10490 | -- Hide_Matching_Homographs -- | |
10491 | ------------------------------ | |
10492 | ||
10493 | procedure Hide_Matching_Homographs | |
10494 | (Subp_Id : Entity_Id; | |
10495 | Start_Elmt : Elmt_Id) | |
10496 | is | |
10497 | Prim : Entity_Id; | |
10498 | Prim_Elmt : Elmt_Id; | |
10499 | ||
10500 | begin | |
10501 | Prim_Elmt := Start_Elmt; | |
10502 | while Present (Prim_Elmt) loop | |
10503 | Prim := Node (Prim_Elmt); | |
10504 | ||
10505 | -- The current primitive is implicitly declared non-overridden | |
3118058b | 10506 | -- non-fully conformant homograph of Subp_Id. Both subprograms |
10507 | -- must be hidden from visibility. | |
8cf481c9 | 10508 | |
10509 | if Chars (Prim) = Chars (Subp_Id) | |
8cf481c9 | 10510 | and then Is_Non_Overridden_Or_Null_Procedure (Prim) |
3118058b | 10511 | and then not Fully_Conformant (Prim, Subp_Id) |
8cf481c9 | 10512 | then |
8c7ee4ac | 10513 | Set_Is_Hidden_Non_Overridden_Subpgm (Prim); |
10514 | Set_Is_Immediately_Visible (Prim, False); | |
10515 | Set_Is_Potentially_Use_Visible (Prim, False); | |
8cf481c9 | 10516 | |
8c7ee4ac | 10517 | Set_Is_Hidden_Non_Overridden_Subpgm (Subp_Id); |
10518 | Set_Is_Immediately_Visible (Subp_Id, False); | |
10519 | Set_Is_Potentially_Use_Visible (Subp_Id, False); | |
8cf481c9 | 10520 | end if; |
10521 | ||
10522 | Next_Elmt (Prim_Elmt); | |
10523 | end loop; | |
10524 | end Hide_Matching_Homographs; | |
10525 | ||
10526 | ----------------------------------------- | |
10527 | -- Is_Non_Overridden_Or_Null_Procedure -- | |
10528 | ----------------------------------------- | |
10529 | ||
10530 | function Is_Non_Overridden_Or_Null_Procedure | |
10531 | (Subp_Id : Entity_Id) return Boolean | |
10532 | is | |
10533 | Alias_Id : Entity_Id; | |
10534 | ||
10535 | begin | |
10536 | -- The subprogram is inherited (implicitly declared), it does not | |
10537 | -- override and does not cover a primitive of an interface. | |
10538 | ||
10539 | if Ekind_In (Subp_Id, E_Function, E_Procedure) | |
10540 | and then Present (Alias (Subp_Id)) | |
10541 | and then No (Interface_Alias (Subp_Id)) | |
10542 | and then No (Overridden_Operation (Subp_Id)) | |
10543 | then | |
10544 | Alias_Id := Alias (Subp_Id); | |
10545 | ||
10546 | if Requires_Overriding (Alias_Id) then | |
10547 | return True; | |
10548 | ||
10549 | elsif Nkind (Parent (Alias_Id)) = N_Procedure_Specification | |
10550 | and then Null_Present (Parent (Alias_Id)) | |
10551 | then | |
10552 | return True; | |
10553 | end if; | |
10554 | end if; | |
10555 | ||
10556 | return False; | |
10557 | end Is_Non_Overridden_Or_Null_Procedure; | |
10558 | ||
10559 | -- Local variables | |
10560 | ||
10561 | Prim_Ops : constant Elist_Id := Direct_Primitive_Operations (Typ); | |
10562 | Prim : Entity_Id; | |
10563 | Prim_Elmt : Elmt_Id; | |
10564 | ||
10565 | -- Start of processing for Hide_Non_Overridden_Subprograms | |
10566 | ||
10567 | begin | |
3118058b | 10568 | -- Inspect the list of primitives looking for non-overridden |
10569 | -- subprograms. | |
8cf481c9 | 10570 | |
10571 | if Present (Prim_Ops) then | |
10572 | Prim_Elmt := First_Elmt (Prim_Ops); | |
10573 | while Present (Prim_Elmt) loop | |
10574 | Prim := Node (Prim_Elmt); | |
10575 | Next_Elmt (Prim_Elmt); | |
10576 | ||
10577 | if Is_Non_Overridden_Or_Null_Procedure (Prim) then | |
10578 | Hide_Matching_Homographs | |
10579 | (Subp_Id => Prim, | |
10580 | Start_Elmt => Prim_Elmt); | |
10581 | end if; | |
10582 | end loop; | |
10583 | end if; | |
10584 | end Hide_Non_Overridden_Subprograms; | |
10585 | ||
10586 | --------------------- | |
10587 | -- Local variables -- | |
10588 | --------------------- | |
10589 | ||
d9f6a4ee | 10590 | E : constant Entity_Id := Entity (N); |
47495553 | 10591 | |
d9f6a4ee | 10592 | Non_Generic_Case : constant Boolean := Nkind (N) = N_Freeze_Entity; |
10593 | -- True in non-generic case. Some of the processing here is skipped | |
10594 | -- for the generic case since it is not needed. Basically in the | |
10595 | -- generic case, we only need to do stuff that might generate error | |
10596 | -- messages or warnings. | |
8cf481c9 | 10597 | |
10598 | -- Start of processing for Freeze_Entity_Checks | |
10599 | ||
d9f6a4ee | 10600 | begin |
10601 | -- Remember that we are processing a freezing entity. Required to | |
10602 | -- ensure correct decoration of internal entities associated with | |
10603 | -- interfaces (see New_Overloaded_Entity). | |
47495553 | 10604 | |
d9f6a4ee | 10605 | Inside_Freezing_Actions := Inside_Freezing_Actions + 1; |
47495553 | 10606 | |
d9f6a4ee | 10607 | -- For tagged types covering interfaces add internal entities that link |
10608 | -- the primitives of the interfaces with the primitives that cover them. | |
10609 | -- Note: These entities were originally generated only when generating | |
10610 | -- code because their main purpose was to provide support to initialize | |
10611 | -- the secondary dispatch tables. They are now generated also when | |
10612 | -- compiling with no code generation to provide ASIS the relationship | |
10613 | -- between interface primitives and tagged type primitives. They are | |
10614 | -- also used to locate primitives covering interfaces when processing | |
10615 | -- generics (see Derive_Subprograms). | |
47495553 | 10616 | |
d9f6a4ee | 10617 | -- This is not needed in the generic case |
47495553 | 10618 | |
d9f6a4ee | 10619 | if Ada_Version >= Ada_2005 |
10620 | and then Non_Generic_Case | |
10621 | and then Ekind (E) = E_Record_Type | |
10622 | and then Is_Tagged_Type (E) | |
10623 | and then not Is_Interface (E) | |
10624 | and then Has_Interfaces (E) | |
10625 | then | |
10626 | -- This would be a good common place to call the routine that checks | |
10627 | -- overriding of interface primitives (and thus factorize calls to | |
10628 | -- Check_Abstract_Overriding located at different contexts in the | |
10629 | -- compiler). However, this is not possible because it causes | |
10630 | -- spurious errors in case of late overriding. | |
47495553 | 10631 | |
d9f6a4ee | 10632 | Add_Internal_Interface_Entities (E); |
10633 | end if; | |
47495553 | 10634 | |
8cf481c9 | 10635 | -- After all forms of overriding have been resolved, a tagged type may |
10636 | -- be left with a set of implicitly declared and possibly erroneous | |
10637 | -- abstract subprograms, null procedures and subprograms that require | |
10638 | -- overriding. If this set contains fully conformat homographs, then one | |
10639 | -- is chosen arbitrarily (already done during resolution), otherwise all | |
3118058b | 10640 | -- remaining non-fully conformant homographs are hidden from visibility |
8cf481c9 | 10641 | -- (Ada RM 8.3 12.3/2). |
10642 | ||
10643 | if Is_Tagged_Type (E) then | |
10644 | Hide_Non_Overridden_Subprograms (E); | |
10645 | end if; | |
10646 | ||
d9f6a4ee | 10647 | -- Check CPP types |
47495553 | 10648 | |
d9f6a4ee | 10649 | if Ekind (E) = E_Record_Type |
10650 | and then Is_CPP_Class (E) | |
10651 | and then Is_Tagged_Type (E) | |
10652 | and then Tagged_Type_Expansion | |
d9f6a4ee | 10653 | then |
10654 | if CPP_Num_Prims (E) = 0 then | |
47495553 | 10655 | |
d9f6a4ee | 10656 | -- If the CPP type has user defined components then it must import |
10657 | -- primitives from C++. This is required because if the C++ class | |
10658 | -- has no primitives then the C++ compiler does not added the _tag | |
10659 | -- component to the type. | |
47495553 | 10660 | |
d9f6a4ee | 10661 | if First_Entity (E) /= Last_Entity (E) then |
10662 | Error_Msg_N | |
10663 | ("'C'P'P type must import at least one primitive from C++??", | |
10664 | E); | |
10665 | end if; | |
10666 | end if; | |
47495553 | 10667 | |
d9f6a4ee | 10668 | -- Check that all its primitives are abstract or imported from C++. |
10669 | -- Check also availability of the C++ constructor. | |
47495553 | 10670 | |
d9f6a4ee | 10671 | declare |
10672 | Has_Constructors : constant Boolean := Has_CPP_Constructors (E); | |
10673 | Elmt : Elmt_Id; | |
10674 | Error_Reported : Boolean := False; | |
10675 | Prim : Node_Id; | |
47495553 | 10676 | |
d9f6a4ee | 10677 | begin |
10678 | Elmt := First_Elmt (Primitive_Operations (E)); | |
10679 | while Present (Elmt) loop | |
10680 | Prim := Node (Elmt); | |
47495553 | 10681 | |
d9f6a4ee | 10682 | if Comes_From_Source (Prim) then |
10683 | if Is_Abstract_Subprogram (Prim) then | |
10684 | null; | |
47495553 | 10685 | |
d9f6a4ee | 10686 | elsif not Is_Imported (Prim) |
10687 | or else Convention (Prim) /= Convention_CPP | |
10688 | then | |
10689 | Error_Msg_N | |
10690 | ("primitives of 'C'P'P types must be imported from C++ " | |
10691 | & "or abstract??", Prim); | |
47495553 | 10692 | |
d9f6a4ee | 10693 | elsif not Has_Constructors |
10694 | and then not Error_Reported | |
10695 | then | |
10696 | Error_Msg_Name_1 := Chars (E); | |
10697 | Error_Msg_N | |
10698 | ("??'C'P'P constructor required for type %", Prim); | |
10699 | Error_Reported := True; | |
10700 | end if; | |
10701 | end if; | |
47495553 | 10702 | |
d9f6a4ee | 10703 | Next_Elmt (Elmt); |
10704 | end loop; | |
10705 | end; | |
10706 | end if; | |
47495553 | 10707 | |
d9f6a4ee | 10708 | -- Check Ada derivation of CPP type |
47495553 | 10709 | |
30ab103b | 10710 | if Expander_Active -- why? losing errors in -gnatc mode??? |
10711 | and then Present (Etype (E)) -- defend against errors | |
d9f6a4ee | 10712 | and then Tagged_Type_Expansion |
10713 | and then Ekind (E) = E_Record_Type | |
10714 | and then Etype (E) /= E | |
10715 | and then Is_CPP_Class (Etype (E)) | |
10716 | and then CPP_Num_Prims (Etype (E)) > 0 | |
10717 | and then not Is_CPP_Class (E) | |
10718 | and then not Has_CPP_Constructors (Etype (E)) | |
10719 | then | |
10720 | -- If the parent has C++ primitives but it has no constructor then | |
10721 | -- check that all the primitives are overridden in this derivation; | |
10722 | -- otherwise the constructor of the parent is needed to build the | |
10723 | -- dispatch table. | |
47495553 | 10724 | |
d9f6a4ee | 10725 | declare |
10726 | Elmt : Elmt_Id; | |
10727 | Prim : Node_Id; | |
47495553 | 10728 | |
10729 | begin | |
d9f6a4ee | 10730 | Elmt := First_Elmt (Primitive_Operations (E)); |
10731 | while Present (Elmt) loop | |
10732 | Prim := Node (Elmt); | |
47495553 | 10733 | |
d9f6a4ee | 10734 | if not Is_Abstract_Subprogram (Prim) |
10735 | and then No (Interface_Alias (Prim)) | |
10736 | and then Find_Dispatching_Type (Ultimate_Alias (Prim)) /= E | |
47495553 | 10737 | then |
d9f6a4ee | 10738 | Error_Msg_Name_1 := Chars (Etype (E)); |
10739 | Error_Msg_N | |
10740 | ("'C'P'P constructor required for parent type %", E); | |
10741 | exit; | |
47495553 | 10742 | end if; |
d9f6a4ee | 10743 | |
10744 | Next_Elmt (Elmt); | |
10745 | end loop; | |
10746 | end; | |
47495553 | 10747 | end if; |
10748 | ||
d9f6a4ee | 10749 | Inside_Freezing_Actions := Inside_Freezing_Actions - 1; |
67278d60 | 10750 | |
d9f6a4ee | 10751 | -- If we have a type with predicates, build predicate function. This |
0e9014a7 | 10752 | -- is not needed in the generic case, and is not needed within TSS |
ea822fd4 | 10753 | -- subprograms and other predefined primitives. |
67278d60 | 10754 | |
ea822fd4 | 10755 | if Non_Generic_Case |
10756 | and then Is_Type (E) | |
10757 | and then Has_Predicates (E) | |
10758 | and then not Within_Internal_Subprogram | |
10759 | then | |
d9f6a4ee | 10760 | Build_Predicate_Functions (E, N); |
10761 | end if; | |
67278d60 | 10762 | |
d9f6a4ee | 10763 | -- If type has delayed aspects, this is where we do the preanalysis at |
10764 | -- the freeze point, as part of the consistent visibility check. Note | |
10765 | -- that this must be done after calling Build_Predicate_Functions or | |
10766 | -- Build_Invariant_Procedure since these subprograms fix occurrences of | |
10767 | -- the subtype name in the saved expression so that they will not cause | |
10768 | -- trouble in the preanalysis. | |
67278d60 | 10769 | |
d9f6a4ee | 10770 | -- This is also not needed in the generic case |
10771 | ||
10772 | if Non_Generic_Case | |
10773 | and then Has_Delayed_Aspects (E) | |
10774 | and then Scope (E) = Current_Scope | |
10775 | then | |
10776 | -- Retrieve the visibility to the discriminants in order to properly | |
10777 | -- analyze the aspects. | |
10778 | ||
10779 | Push_Scope_And_Install_Discriminants (E); | |
10780 | ||
10781 | declare | |
10782 | Ritem : Node_Id; | |
10783 | ||
10784 | begin | |
10785 | -- Look for aspect specification entries for this entity | |
67278d60 | 10786 | |
d9f6a4ee | 10787 | Ritem := First_Rep_Item (E); |
10788 | while Present (Ritem) loop | |
10789 | if Nkind (Ritem) = N_Aspect_Specification | |
10790 | and then Entity (Ritem) = E | |
10791 | and then Is_Delayed_Aspect (Ritem) | |
10792 | then | |
10793 | Check_Aspect_At_Freeze_Point (Ritem); | |
10794 | end if; | |
67278d60 | 10795 | |
d9f6a4ee | 10796 | Next_Rep_Item (Ritem); |
10797 | end loop; | |
10798 | end; | |
67278d60 | 10799 | |
d9f6a4ee | 10800 | Uninstall_Discriminants_And_Pop_Scope (E); |
67278d60 | 10801 | end if; |
67278d60 | 10802 | |
d9f6a4ee | 10803 | -- For a record type, deal with variant parts. This has to be delayed |
d0988351 | 10804 | -- to this point, because of the issue of statically predicated |
d9f6a4ee | 10805 | -- subtypes, which we have to ensure are frozen before checking |
10806 | -- choices, since we need to have the static choice list set. | |
d6f39728 | 10807 | |
d9f6a4ee | 10808 | if Is_Record_Type (E) then |
10809 | Check_Variant_Part : declare | |
10810 | D : constant Node_Id := Declaration_Node (E); | |
10811 | T : Node_Id; | |
10812 | C : Node_Id; | |
10813 | VP : Node_Id; | |
d6f39728 | 10814 | |
d9f6a4ee | 10815 | Others_Present : Boolean; |
10816 | pragma Warnings (Off, Others_Present); | |
10817 | -- Indicates others present, not used in this case | |
d6f39728 | 10818 | |
d9f6a4ee | 10819 | procedure Non_Static_Choice_Error (Choice : Node_Id); |
10820 | -- Error routine invoked by the generic instantiation below when | |
10821 | -- the variant part has a non static choice. | |
f117057b | 10822 | |
d9f6a4ee | 10823 | procedure Process_Declarations (Variant : Node_Id); |
10824 | -- Processes declarations associated with a variant. We analyzed | |
10825 | -- the declarations earlier (in Sem_Ch3.Analyze_Variant_Part), | |
10826 | -- but we still need the recursive call to Check_Choices for any | |
10827 | -- nested variant to get its choices properly processed. This is | |
10828 | -- also where we expand out the choices if expansion is active. | |
1f526845 | 10829 | |
d9f6a4ee | 10830 | package Variant_Choices_Processing is new |
10831 | Generic_Check_Choices | |
10832 | (Process_Empty_Choice => No_OP, | |
10833 | Process_Non_Static_Choice => Non_Static_Choice_Error, | |
10834 | Process_Associated_Node => Process_Declarations); | |
10835 | use Variant_Choices_Processing; | |
f117057b | 10836 | |
d9f6a4ee | 10837 | ----------------------------- |
10838 | -- Non_Static_Choice_Error -- | |
10839 | ----------------------------- | |
d6f39728 | 10840 | |
d9f6a4ee | 10841 | procedure Non_Static_Choice_Error (Choice : Node_Id) is |
10842 | begin | |
10843 | Flag_Non_Static_Expr | |
10844 | ("choice given in variant part is not static!", Choice); | |
10845 | end Non_Static_Choice_Error; | |
d6f39728 | 10846 | |
d9f6a4ee | 10847 | -------------------------- |
10848 | -- Process_Declarations -- | |
10849 | -------------------------- | |
dba36b60 | 10850 | |
d9f6a4ee | 10851 | procedure Process_Declarations (Variant : Node_Id) is |
10852 | CL : constant Node_Id := Component_List (Variant); | |
10853 | VP : Node_Id; | |
dba36b60 | 10854 | |
d9f6a4ee | 10855 | begin |
10856 | -- Check for static predicate present in this variant | |
ea61a7ea | 10857 | |
d9f6a4ee | 10858 | if Has_SP_Choice (Variant) then |
ea61a7ea | 10859 | |
d9f6a4ee | 10860 | -- Here we expand. You might expect to find this call in |
10861 | -- Expand_N_Variant_Part, but that is called when we first | |
10862 | -- see the variant part, and we cannot do this expansion | |
10863 | -- earlier than the freeze point, since for statically | |
10864 | -- predicated subtypes, the predicate is not known till | |
10865 | -- the freeze point. | |
ea61a7ea | 10866 | |
d9f6a4ee | 10867 | -- Furthermore, we do this expansion even if the expander |
10868 | -- is not active, because other semantic processing, e.g. | |
10869 | -- for aggregates, requires the expanded list of choices. | |
ea61a7ea | 10870 | |
d9f6a4ee | 10871 | -- If the expander is not active, then we can't just clobber |
10872 | -- the list since it would invalidate the ASIS -gnatct tree. | |
10873 | -- So we have to rewrite the variant part with a Rewrite | |
10874 | -- call that replaces it with a copy and clobber the copy. | |
10875 | ||
10876 | if not Expander_Active then | |
10877 | declare | |
10878 | NewV : constant Node_Id := New_Copy (Variant); | |
10879 | begin | |
10880 | Set_Discrete_Choices | |
10881 | (NewV, New_Copy_List (Discrete_Choices (Variant))); | |
10882 | Rewrite (Variant, NewV); | |
10883 | end; | |
10884 | end if; | |
10885 | ||
10886 | Expand_Static_Predicates_In_Choices (Variant); | |
ea61a7ea | 10887 | end if; |
10888 | ||
d9f6a4ee | 10889 | -- We don't need to worry about the declarations in the variant |
10890 | -- (since they were analyzed by Analyze_Choices when we first | |
10891 | -- encountered the variant), but we do need to take care of | |
10892 | -- expansion of any nested variants. | |
ea61a7ea | 10893 | |
d9f6a4ee | 10894 | if not Null_Present (CL) then |
10895 | VP := Variant_Part (CL); | |
ea61a7ea | 10896 | |
d9f6a4ee | 10897 | if Present (VP) then |
10898 | Check_Choices | |
10899 | (VP, Variants (VP), Etype (Name (VP)), Others_Present); | |
10900 | end if; | |
10901 | end if; | |
10902 | end Process_Declarations; | |
ea61a7ea | 10903 | |
d9f6a4ee | 10904 | -- Start of processing for Check_Variant_Part |
b9e61b2a | 10905 | |
d9f6a4ee | 10906 | begin |
10907 | -- Find component list | |
ea61a7ea | 10908 | |
d9f6a4ee | 10909 | C := Empty; |
ea61a7ea | 10910 | |
d9f6a4ee | 10911 | if Nkind (D) = N_Full_Type_Declaration then |
10912 | T := Type_Definition (D); | |
ea61a7ea | 10913 | |
d9f6a4ee | 10914 | if Nkind (T) = N_Record_Definition then |
10915 | C := Component_List (T); | |
d6f39728 | 10916 | |
d9f6a4ee | 10917 | elsif Nkind (T) = N_Derived_Type_Definition |
10918 | and then Present (Record_Extension_Part (T)) | |
10919 | then | |
10920 | C := Component_List (Record_Extension_Part (T)); | |
10921 | end if; | |
10922 | end if; | |
d6f39728 | 10923 | |
d9f6a4ee | 10924 | -- Case of variant part present |
d6f39728 | 10925 | |
d9f6a4ee | 10926 | if Present (C) and then Present (Variant_Part (C)) then |
10927 | VP := Variant_Part (C); | |
ea61a7ea | 10928 | |
d9f6a4ee | 10929 | -- Check choices |
ea61a7ea | 10930 | |
d9f6a4ee | 10931 | Check_Choices |
10932 | (VP, Variants (VP), Etype (Name (VP)), Others_Present); | |
ea61a7ea | 10933 | |
d9f6a4ee | 10934 | -- If the last variant does not contain the Others choice, |
10935 | -- replace it with an N_Others_Choice node since Gigi always | |
10936 | -- wants an Others. Note that we do not bother to call Analyze | |
10937 | -- on the modified variant part, since its only effect would be | |
10938 | -- to compute the Others_Discrete_Choices node laboriously, and | |
10939 | -- of course we already know the list of choices corresponding | |
39a0c1d3 | 10940 | -- to the others choice (it's the list we're replacing). |
d6f39728 | 10941 | |
d9f6a4ee | 10942 | -- We only want to do this if the expander is active, since |
39a0c1d3 | 10943 | -- we do not want to clobber the ASIS tree. |
d6f39728 | 10944 | |
d9f6a4ee | 10945 | if Expander_Active then |
10946 | declare | |
10947 | Last_Var : constant Node_Id := | |
10948 | Last_Non_Pragma (Variants (VP)); | |
d6f39728 | 10949 | |
d9f6a4ee | 10950 | Others_Node : Node_Id; |
d6f39728 | 10951 | |
d9f6a4ee | 10952 | begin |
10953 | if Nkind (First (Discrete_Choices (Last_Var))) /= | |
10954 | N_Others_Choice | |
10955 | then | |
10956 | Others_Node := Make_Others_Choice (Sloc (Last_Var)); | |
10957 | Set_Others_Discrete_Choices | |
10958 | (Others_Node, Discrete_Choices (Last_Var)); | |
10959 | Set_Discrete_Choices | |
10960 | (Last_Var, New_List (Others_Node)); | |
10961 | end if; | |
10962 | end; | |
10963 | end if; | |
d6f39728 | 10964 | end if; |
d9f6a4ee | 10965 | end Check_Variant_Part; |
d6f39728 | 10966 | end if; |
d9f6a4ee | 10967 | end Freeze_Entity_Checks; |
d6f39728 | 10968 | |
10969 | ------------------------- | |
10970 | -- Get_Alignment_Value -- | |
10971 | ------------------------- | |
10972 | ||
10973 | function Get_Alignment_Value (Expr : Node_Id) return Uint is | |
10974 | Align : constant Uint := Static_Integer (Expr); | |
10975 | ||
10976 | begin | |
10977 | if Align = No_Uint then | |
10978 | return No_Uint; | |
10979 | ||
10980 | elsif Align <= 0 then | |
10981 | Error_Msg_N ("alignment value must be positive", Expr); | |
10982 | return No_Uint; | |
10983 | ||
10984 | else | |
10985 | for J in Int range 0 .. 64 loop | |
10986 | declare | |
10987 | M : constant Uint := Uint_2 ** J; | |
10988 | ||
10989 | begin | |
10990 | exit when M = Align; | |
10991 | ||
10992 | if M > Align then | |
10993 | Error_Msg_N | |
10994 | ("alignment value must be power of 2", Expr); | |
10995 | return No_Uint; | |
10996 | end if; | |
10997 | end; | |
10998 | end loop; | |
10999 | ||
11000 | return Align; | |
11001 | end if; | |
11002 | end Get_Alignment_Value; | |
11003 | ||
99a2d5bd | 11004 | ------------------------------------- |
11005 | -- Inherit_Aspects_At_Freeze_Point -- | |
11006 | ------------------------------------- | |
11007 | ||
11008 | procedure Inherit_Aspects_At_Freeze_Point (Typ : Entity_Id) is | |
11009 | function Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11010 | (Rep_Item : Node_Id) return Boolean; | |
11011 | -- This routine checks if Rep_Item is either a pragma or an aspect | |
11012 | -- specification node whose correponding pragma (if any) is present in | |
11013 | -- the Rep Item chain of the entity it has been specified to. | |
11014 | ||
11015 | -------------------------------------------------- | |
11016 | -- Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item -- | |
11017 | -------------------------------------------------- | |
11018 | ||
11019 | function Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11020 | (Rep_Item : Node_Id) return Boolean | |
11021 | is | |
11022 | begin | |
ec6f6da5 | 11023 | return |
11024 | Nkind (Rep_Item) = N_Pragma | |
11025 | or else Present_In_Rep_Item | |
11026 | (Entity (Rep_Item), Aspect_Rep_Item (Rep_Item)); | |
99a2d5bd | 11027 | end Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item; |
11028 | ||
29a9d4be | 11029 | -- Start of processing for Inherit_Aspects_At_Freeze_Point |
11030 | ||
99a2d5bd | 11031 | begin |
11032 | -- A representation item is either subtype-specific (Size and Alignment | |
11033 | -- clauses) or type-related (all others). Subtype-specific aspects may | |
29a9d4be | 11034 | -- differ for different subtypes of the same type (RM 13.1.8). |
99a2d5bd | 11035 | |
11036 | -- A derived type inherits each type-related representation aspect of | |
11037 | -- its parent type that was directly specified before the declaration of | |
29a9d4be | 11038 | -- the derived type (RM 13.1.15). |
99a2d5bd | 11039 | |
11040 | -- A derived subtype inherits each subtype-specific representation | |
11041 | -- aspect of its parent subtype that was directly specified before the | |
29a9d4be | 11042 | -- declaration of the derived type (RM 13.1.15). |
99a2d5bd | 11043 | |
11044 | -- The general processing involves inheriting a representation aspect | |
11045 | -- from a parent type whenever the first rep item (aspect specification, | |
11046 | -- attribute definition clause, pragma) corresponding to the given | |
11047 | -- representation aspect in the rep item chain of Typ, if any, isn't | |
11048 | -- directly specified to Typ but to one of its parents. | |
11049 | ||
11050 | -- ??? Note that, for now, just a limited number of representation | |
29a9d4be | 11051 | -- aspects have been inherited here so far. Many of them are |
11052 | -- still inherited in Sem_Ch3. This will be fixed soon. Here is | |
11053 | -- a non- exhaustive list of aspects that likely also need to | |
11054 | -- be moved to this routine: Alignment, Component_Alignment, | |
11055 | -- Component_Size, Machine_Radix, Object_Size, Pack, Predicates, | |
99a2d5bd | 11056 | -- Preelaborable_Initialization, RM_Size and Small. |
11057 | ||
8b6e9bf2 | 11058 | -- In addition, Convention must be propagated from base type to subtype, |
11059 | -- because the subtype may have been declared on an incomplete view. | |
11060 | ||
99a2d5bd | 11061 | if Nkind (Parent (Typ)) = N_Private_Extension_Declaration then |
11062 | return; | |
11063 | end if; | |
11064 | ||
11065 | -- Ada_05/Ada_2005 | |
11066 | ||
11067 | if not Has_Rep_Item (Typ, Name_Ada_05, Name_Ada_2005, False) | |
11068 | and then Has_Rep_Item (Typ, Name_Ada_05, Name_Ada_2005) | |
11069 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11070 | (Get_Rep_Item (Typ, Name_Ada_05, Name_Ada_2005)) | |
11071 | then | |
11072 | Set_Is_Ada_2005_Only (Typ); | |
11073 | end if; | |
11074 | ||
11075 | -- Ada_12/Ada_2012 | |
11076 | ||
11077 | if not Has_Rep_Item (Typ, Name_Ada_12, Name_Ada_2012, False) | |
11078 | and then Has_Rep_Item (Typ, Name_Ada_12, Name_Ada_2012) | |
11079 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11080 | (Get_Rep_Item (Typ, Name_Ada_12, Name_Ada_2012)) | |
11081 | then | |
11082 | Set_Is_Ada_2012_Only (Typ); | |
11083 | end if; | |
11084 | ||
11085 | -- Atomic/Shared | |
11086 | ||
11087 | if not Has_Rep_Item (Typ, Name_Atomic, Name_Shared, False) | |
11088 | and then Has_Rep_Pragma (Typ, Name_Atomic, Name_Shared) | |
11089 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11090 | (Get_Rep_Item (Typ, Name_Atomic, Name_Shared)) | |
11091 | then | |
11092 | Set_Is_Atomic (Typ); | |
11093 | Set_Treat_As_Volatile (Typ); | |
11094 | Set_Is_Volatile (Typ); | |
11095 | end if; | |
11096 | ||
8b6e9bf2 | 11097 | -- Convention |
11098 | ||
7ac4254e | 11099 | if Is_Record_Type (Typ) |
11100 | and then Typ /= Base_Type (Typ) and then Is_Frozen (Base_Type (Typ)) | |
11101 | then | |
8b6e9bf2 | 11102 | Set_Convention (Typ, Convention (Base_Type (Typ))); |
11103 | end if; | |
11104 | ||
29a9d4be | 11105 | -- Default_Component_Value |
99a2d5bd | 11106 | |
81c2bc19 | 11107 | -- Verify that there is no rep_item declared for the type, and there |
11108 | -- is one coming from an ancestor. | |
11109 | ||
99a2d5bd | 11110 | if Is_Array_Type (Typ) |
f3d70f08 | 11111 | and then Is_Base_Type (Typ) |
81c2bc19 | 11112 | and then not Has_Rep_Item (Typ, Name_Default_Component_Value, False) |
99a2d5bd | 11113 | and then Has_Rep_Item (Typ, Name_Default_Component_Value) |
11114 | then | |
11115 | Set_Default_Aspect_Component_Value (Typ, | |
11116 | Default_Aspect_Component_Value | |
11117 | (Entity (Get_Rep_Item (Typ, Name_Default_Component_Value)))); | |
11118 | end if; | |
11119 | ||
29a9d4be | 11120 | -- Default_Value |
99a2d5bd | 11121 | |
11122 | if Is_Scalar_Type (Typ) | |
f3d70f08 | 11123 | and then Is_Base_Type (Typ) |
81c2bc19 | 11124 | and then not Has_Rep_Item (Typ, Name_Default_Value, False) |
99a2d5bd | 11125 | and then Has_Rep_Item (Typ, Name_Default_Value) |
11126 | then | |
81c2bc19 | 11127 | Set_Has_Default_Aspect (Typ); |
99a2d5bd | 11128 | Set_Default_Aspect_Value (Typ, |
11129 | Default_Aspect_Value | |
11130 | (Entity (Get_Rep_Item (Typ, Name_Default_Value)))); | |
11131 | end if; | |
11132 | ||
11133 | -- Discard_Names | |
11134 | ||
11135 | if not Has_Rep_Item (Typ, Name_Discard_Names, False) | |
11136 | and then Has_Rep_Item (Typ, Name_Discard_Names) | |
11137 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11138 | (Get_Rep_Item (Typ, Name_Discard_Names)) | |
11139 | then | |
11140 | Set_Discard_Names (Typ); | |
11141 | end if; | |
11142 | ||
11143 | -- Invariants | |
11144 | ||
11145 | if not Has_Rep_Item (Typ, Name_Invariant, False) | |
11146 | and then Has_Rep_Item (Typ, Name_Invariant) | |
11147 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11148 | (Get_Rep_Item (Typ, Name_Invariant)) | |
11149 | then | |
11150 | Set_Has_Invariants (Typ); | |
11151 | ||
11152 | if Class_Present (Get_Rep_Item (Typ, Name_Invariant)) then | |
11153 | Set_Has_Inheritable_Invariants (Typ); | |
11154 | end if; | |
d7487d7d | 11155 | |
953378ae | 11156 | -- If we have a subtype with invariants, whose base type does not have |
11157 | -- invariants, copy these invariants to the base type. This happens for | |
11158 | -- the case of implicit base types created for scalar and array types. | |
d7487d7d | 11159 | |
953378ae | 11160 | elsif Has_Invariants (Typ) |
d7487d7d | 11161 | and then not Has_Invariants (Base_Type (Typ)) |
11162 | then | |
11163 | Set_Has_Invariants (Base_Type (Typ)); | |
11164 | Set_Invariant_Procedure (Base_Type (Typ), Invariant_Procedure (Typ)); | |
99a2d5bd | 11165 | end if; |
11166 | ||
11167 | -- Volatile | |
11168 | ||
11169 | if not Has_Rep_Item (Typ, Name_Volatile, False) | |
11170 | and then Has_Rep_Item (Typ, Name_Volatile) | |
11171 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11172 | (Get_Rep_Item (Typ, Name_Volatile)) | |
11173 | then | |
11174 | Set_Treat_As_Volatile (Typ); | |
11175 | Set_Is_Volatile (Typ); | |
11176 | end if; | |
11177 | ||
2fe893b9 | 11178 | -- Volatile_Full_Access |
11179 | ||
11180 | if not Has_Rep_Item (Typ, Name_Volatile_Full_Access, False) | |
11181 | and then Has_Rep_Pragma (Typ, Name_Volatile_Full_Access) | |
11182 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11183 | (Get_Rep_Item (Typ, Name_Volatile_Full_Access)) | |
11184 | then | |
11185 | Set_Has_Volatile_Full_Access (Typ); | |
11186 | Set_Treat_As_Volatile (Typ); | |
11187 | Set_Is_Volatile (Typ); | |
11188 | end if; | |
11189 | ||
99a2d5bd | 11190 | -- Inheritance for derived types only |
11191 | ||
11192 | if Is_Derived_Type (Typ) then | |
11193 | declare | |
11194 | Bas_Typ : constant Entity_Id := Base_Type (Typ); | |
11195 | Imp_Bas_Typ : constant Entity_Id := Implementation_Base_Type (Typ); | |
11196 | ||
11197 | begin | |
11198 | -- Atomic_Components | |
11199 | ||
11200 | if not Has_Rep_Item (Typ, Name_Atomic_Components, False) | |
11201 | and then Has_Rep_Item (Typ, Name_Atomic_Components) | |
11202 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11203 | (Get_Rep_Item (Typ, Name_Atomic_Components)) | |
11204 | then | |
11205 | Set_Has_Atomic_Components (Imp_Bas_Typ); | |
11206 | end if; | |
11207 | ||
11208 | -- Volatile_Components | |
11209 | ||
11210 | if not Has_Rep_Item (Typ, Name_Volatile_Components, False) | |
11211 | and then Has_Rep_Item (Typ, Name_Volatile_Components) | |
11212 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11213 | (Get_Rep_Item (Typ, Name_Volatile_Components)) | |
11214 | then | |
11215 | Set_Has_Volatile_Components (Imp_Bas_Typ); | |
11216 | end if; | |
11217 | ||
e81df51c | 11218 | -- Finalize_Storage_Only |
99a2d5bd | 11219 | |
11220 | if not Has_Rep_Pragma (Typ, Name_Finalize_Storage_Only, False) | |
11221 | and then Has_Rep_Pragma (Typ, Name_Finalize_Storage_Only) | |
11222 | then | |
11223 | Set_Finalize_Storage_Only (Bas_Typ); | |
11224 | end if; | |
11225 | ||
11226 | -- Universal_Aliasing | |
11227 | ||
11228 | if not Has_Rep_Item (Typ, Name_Universal_Aliasing, False) | |
11229 | and then Has_Rep_Item (Typ, Name_Universal_Aliasing) | |
11230 | and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item | |
11231 | (Get_Rep_Item (Typ, Name_Universal_Aliasing)) | |
11232 | then | |
11233 | Set_Universal_Aliasing (Imp_Bas_Typ); | |
11234 | end if; | |
11235 | ||
e81df51c | 11236 | -- Bit_Order |
99a2d5bd | 11237 | |
11238 | if Is_Record_Type (Typ) then | |
99a2d5bd | 11239 | if not Has_Rep_Item (Typ, Name_Bit_Order, False) |
11240 | and then Has_Rep_Item (Typ, Name_Bit_Order) | |
11241 | then | |
11242 | Set_Reverse_Bit_Order (Bas_Typ, | |
11243 | Reverse_Bit_Order (Entity (Name | |
11244 | (Get_Rep_Item (Typ, Name_Bit_Order))))); | |
11245 | end if; | |
e81df51c | 11246 | end if; |
11247 | ||
e9218716 | 11248 | -- Scalar_Storage_Order |
11249 | ||
11250 | -- Note: the aspect is specified on a first subtype, but recorded | |
11251 | -- in a flag of the base type! | |
e81df51c | 11252 | |
11253 | if (Is_Record_Type (Typ) or else Is_Array_Type (Typ)) | |
29b91bc7 | 11254 | and then Typ = Bas_Typ |
e81df51c | 11255 | then |
e81df51c | 11256 | -- For a type extension, always inherit from parent; otherwise |
11257 | -- inherit if no default applies. Note: we do not check for | |
11258 | -- an explicit rep item on the parent type when inheriting, | |
11259 | -- because the parent SSO may itself have been set by default. | |
99a2d5bd | 11260 | |
e9218716 | 11261 | if not Has_Rep_Item (First_Subtype (Typ), |
11262 | Name_Scalar_Storage_Order, False) | |
e81df51c | 11263 | and then (Is_Tagged_Type (Bas_Typ) |
29b91bc7 | 11264 | or else not (SSO_Set_Low_By_Default (Bas_Typ) |
11265 | or else | |
11266 | SSO_Set_High_By_Default (Bas_Typ))) | |
99a2d5bd | 11267 | then |
11268 | Set_Reverse_Storage_Order (Bas_Typ, | |
423b89fd | 11269 | Reverse_Storage_Order |
11270 | (Implementation_Base_Type (Etype (Bas_Typ)))); | |
b64082f2 | 11271 | |
11272 | -- Clear default SSO indications, since the inherited aspect | |
11273 | -- which was set explicitly overrides the default. | |
11274 | ||
11275 | Set_SSO_Set_Low_By_Default (Bas_Typ, False); | |
11276 | Set_SSO_Set_High_By_Default (Bas_Typ, False); | |
99a2d5bd | 11277 | end if; |
11278 | end if; | |
11279 | end; | |
11280 | end if; | |
11281 | end Inherit_Aspects_At_Freeze_Point; | |
11282 | ||
d6f39728 | 11283 | ---------------- |
11284 | -- Initialize -- | |
11285 | ---------------- | |
11286 | ||
11287 | procedure Initialize is | |
11288 | begin | |
7717ea00 | 11289 | Address_Clause_Checks.Init; |
d6f39728 | 11290 | Unchecked_Conversions.Init; |
dba38d2f | 11291 | |
11292 | if VM_Target /= No_VM or else AAMP_On_Target then | |
11293 | Independence_Checks.Init; | |
11294 | end if; | |
d6f39728 | 11295 | end Initialize; |
11296 | ||
2625eb01 | 11297 | --------------------------- |
11298 | -- Install_Discriminants -- | |
11299 | --------------------------- | |
11300 | ||
11301 | procedure Install_Discriminants (E : Entity_Id) is | |
11302 | Disc : Entity_Id; | |
11303 | Prev : Entity_Id; | |
11304 | begin | |
11305 | Disc := First_Discriminant (E); | |
11306 | while Present (Disc) loop | |
11307 | Prev := Current_Entity (Disc); | |
11308 | Set_Current_Entity (Disc); | |
11309 | Set_Is_Immediately_Visible (Disc); | |
11310 | Set_Homonym (Disc, Prev); | |
11311 | Next_Discriminant (Disc); | |
11312 | end loop; | |
11313 | end Install_Discriminants; | |
11314 | ||
d6f39728 | 11315 | ------------------------- |
11316 | -- Is_Operational_Item -- | |
11317 | ------------------------- | |
11318 | ||
11319 | function Is_Operational_Item (N : Node_Id) return Boolean is | |
11320 | begin | |
11321 | if Nkind (N) /= N_Attribute_Definition_Clause then | |
11322 | return False; | |
b9e61b2a | 11323 | |
d6f39728 | 11324 | else |
11325 | declare | |
b9e61b2a | 11326 | Id : constant Attribute_Id := Get_Attribute_Id (Chars (N)); |
d6f39728 | 11327 | begin |
b9e61b2a | 11328 | return Id = Attribute_Input |
d6f39728 | 11329 | or else Id = Attribute_Output |
11330 | or else Id = Attribute_Read | |
f15731c4 | 11331 | or else Id = Attribute_Write |
11332 | or else Id = Attribute_External_Tag; | |
d6f39728 | 11333 | end; |
11334 | end if; | |
11335 | end Is_Operational_Item; | |
11336 | ||
3b23aaa0 | 11337 | ------------------------- |
11338 | -- Is_Predicate_Static -- | |
11339 | ------------------------- | |
11340 | ||
94d896aa | 11341 | -- Note: the basic legality of the expression has already been checked, so |
11342 | -- we don't need to worry about cases or ranges on strings for example. | |
11343 | ||
3b23aaa0 | 11344 | function Is_Predicate_Static |
11345 | (Expr : Node_Id; | |
11346 | Nam : Name_Id) return Boolean | |
11347 | is | |
11348 | function All_Static_Case_Alternatives (L : List_Id) return Boolean; | |
973c2fba | 11349 | -- Given a list of case expression alternatives, returns True if all |
11350 | -- the alternatives are static (have all static choices, and a static | |
11351 | -- expression). | |
3b23aaa0 | 11352 | |
11353 | function All_Static_Choices (L : List_Id) return Boolean; | |
a360a0f7 | 11354 | -- Returns true if all elements of the list are OK static choices |
3b23aaa0 | 11355 | -- as defined below for Is_Static_Choice. Used for case expression |
973c2fba | 11356 | -- alternatives and for the right operand of a membership test. An |
11357 | -- others_choice is static if the corresponding expression is static. | |
7c0c95b8 | 11358 | -- The staticness of the bounds is checked separately. |
3b23aaa0 | 11359 | |
11360 | function Is_Static_Choice (N : Node_Id) return Boolean; | |
11361 | -- Returns True if N represents a static choice (static subtype, or | |
a360a0f7 | 11362 | -- static subtype indication, or static expression, or static range). |
3b23aaa0 | 11363 | -- |
11364 | -- Note that this is a bit more inclusive than we actually need | |
11365 | -- (in particular membership tests do not allow the use of subtype | |
a360a0f7 | 11366 | -- indications). But that doesn't matter, we have already checked |
3b23aaa0 | 11367 | -- that the construct is legal to get this far. |
11368 | ||
11369 | function Is_Type_Ref (N : Node_Id) return Boolean; | |
11370 | pragma Inline (Is_Type_Ref); | |
973c2fba | 11371 | -- Returns True if N is a reference to the type for the predicate in the |
11372 | -- expression (i.e. if it is an identifier whose Chars field matches the | |
11373 | -- Nam given in the call). N must not be parenthesized, if the type name | |
11374 | -- appears in parens, this routine will return False. | |
3b23aaa0 | 11375 | |
11376 | ---------------------------------- | |
11377 | -- All_Static_Case_Alternatives -- | |
11378 | ---------------------------------- | |
11379 | ||
11380 | function All_Static_Case_Alternatives (L : List_Id) return Boolean is | |
11381 | N : Node_Id; | |
11382 | ||
11383 | begin | |
11384 | N := First (L); | |
11385 | while Present (N) loop | |
11386 | if not (All_Static_Choices (Discrete_Choices (N)) | |
11387 | and then Is_OK_Static_Expression (Expression (N))) | |
11388 | then | |
11389 | return False; | |
11390 | end if; | |
11391 | ||
11392 | Next (N); | |
11393 | end loop; | |
11394 | ||
11395 | return True; | |
11396 | end All_Static_Case_Alternatives; | |
11397 | ||
11398 | ------------------------ | |
11399 | -- All_Static_Choices -- | |
11400 | ------------------------ | |
11401 | ||
11402 | function All_Static_Choices (L : List_Id) return Boolean is | |
11403 | N : Node_Id; | |
11404 | ||
11405 | begin | |
11406 | N := First (L); | |
11407 | while Present (N) loop | |
11408 | if not Is_Static_Choice (N) then | |
11409 | return False; | |
11410 | end if; | |
11411 | ||
11412 | Next (N); | |
11413 | end loop; | |
11414 | ||
11415 | return True; | |
11416 | end All_Static_Choices; | |
11417 | ||
11418 | ---------------------- | |
11419 | -- Is_Static_Choice -- | |
11420 | ---------------------- | |
11421 | ||
11422 | function Is_Static_Choice (N : Node_Id) return Boolean is | |
11423 | begin | |
7c0c95b8 | 11424 | return Nkind (N) = N_Others_Choice |
11425 | or else Is_OK_Static_Expression (N) | |
3b23aaa0 | 11426 | or else (Is_Entity_Name (N) and then Is_Type (Entity (N)) |
11427 | and then Is_OK_Static_Subtype (Entity (N))) | |
11428 | or else (Nkind (N) = N_Subtype_Indication | |
11429 | and then Is_OK_Static_Subtype (Entity (N))) | |
11430 | or else (Nkind (N) = N_Range and then Is_OK_Static_Range (N)); | |
11431 | end Is_Static_Choice; | |
11432 | ||
11433 | ----------------- | |
11434 | -- Is_Type_Ref -- | |
11435 | ----------------- | |
11436 | ||
11437 | function Is_Type_Ref (N : Node_Id) return Boolean is | |
11438 | begin | |
11439 | return Nkind (N) = N_Identifier | |
11440 | and then Chars (N) = Nam | |
11441 | and then Paren_Count (N) = 0; | |
11442 | end Is_Type_Ref; | |
11443 | ||
11444 | -- Start of processing for Is_Predicate_Static | |
11445 | ||
11446 | begin | |
3b23aaa0 | 11447 | -- Predicate_Static means one of the following holds. Numbers are the |
11448 | -- corresponding paragraph numbers in (RM 3.2.4(16-22)). | |
11449 | ||
11450 | -- 16: A static expression | |
11451 | ||
11452 | if Is_OK_Static_Expression (Expr) then | |
11453 | return True; | |
11454 | ||
11455 | -- 17: A membership test whose simple_expression is the current | |
11456 | -- instance, and whose membership_choice_list meets the requirements | |
11457 | -- for a static membership test. | |
11458 | ||
11459 | elsif Nkind (Expr) in N_Membership_Test | |
11460 | and then ((Present (Right_Opnd (Expr)) | |
11461 | and then Is_Static_Choice (Right_Opnd (Expr))) | |
11462 | or else | |
11463 | (Present (Alternatives (Expr)) | |
11464 | and then All_Static_Choices (Alternatives (Expr)))) | |
11465 | then | |
11466 | return True; | |
11467 | ||
11468 | -- 18. A case_expression whose selecting_expression is the current | |
11469 | -- instance, and whose dependent expressions are static expressions. | |
11470 | ||
11471 | elsif Nkind (Expr) = N_Case_Expression | |
11472 | and then Is_Type_Ref (Expression (Expr)) | |
11473 | and then All_Static_Case_Alternatives (Alternatives (Expr)) | |
11474 | then | |
11475 | return True; | |
11476 | ||
11477 | -- 19. A call to a predefined equality or ordering operator, where one | |
11478 | -- operand is the current instance, and the other is a static | |
11479 | -- expression. | |
11480 | ||
94d896aa | 11481 | -- Note: the RM is clearly wrong here in not excluding string types. |
11482 | -- Without this exclusion, we would allow expressions like X > "ABC" | |
11483 | -- to be considered as predicate-static, which is clearly not intended, | |
11484 | -- since the idea is for predicate-static to be a subset of normal | |
11485 | -- static expressions (and "DEF" > "ABC" is not a static expression). | |
11486 | ||
11487 | -- However, we do allow internally generated (not from source) equality | |
11488 | -- and inequality operations to be valid on strings (this helps deal | |
11489 | -- with cases where we transform A in "ABC" to A = "ABC). | |
11490 | ||
3b23aaa0 | 11491 | elsif Nkind (Expr) in N_Op_Compare |
94d896aa | 11492 | and then ((not Is_String_Type (Etype (Left_Opnd (Expr)))) |
11493 | or else (Nkind_In (Expr, N_Op_Eq, N_Op_Ne) | |
11494 | and then not Comes_From_Source (Expr))) | |
3b23aaa0 | 11495 | and then ((Is_Type_Ref (Left_Opnd (Expr)) |
11496 | and then Is_OK_Static_Expression (Right_Opnd (Expr))) | |
11497 | or else | |
11498 | (Is_Type_Ref (Right_Opnd (Expr)) | |
11499 | and then Is_OK_Static_Expression (Left_Opnd (Expr)))) | |
11500 | then | |
11501 | return True; | |
11502 | ||
11503 | -- 20. A call to a predefined boolean logical operator, where each | |
11504 | -- operand is predicate-static. | |
11505 | ||
11506 | elsif (Nkind_In (Expr, N_Op_And, N_Op_Or, N_Op_Xor) | |
11507 | and then Is_Predicate_Static (Left_Opnd (Expr), Nam) | |
11508 | and then Is_Predicate_Static (Right_Opnd (Expr), Nam)) | |
11509 | or else | |
11510 | (Nkind (Expr) = N_Op_Not | |
11511 | and then Is_Predicate_Static (Right_Opnd (Expr), Nam)) | |
11512 | then | |
11513 | return True; | |
11514 | ||
11515 | -- 21. A short-circuit control form where both operands are | |
11516 | -- predicate-static. | |
11517 | ||
11518 | elsif Nkind (Expr) in N_Short_Circuit | |
11519 | and then Is_Predicate_Static (Left_Opnd (Expr), Nam) | |
11520 | and then Is_Predicate_Static (Right_Opnd (Expr), Nam) | |
11521 | then | |
11522 | return True; | |
11523 | ||
11524 | -- 22. A parenthesized predicate-static expression. This does not | |
11525 | -- require any special test, since we just ignore paren levels in | |
11526 | -- all the cases above. | |
11527 | ||
11528 | -- One more test that is an implementation artifact caused by the fact | |
499918a7 | 11529 | -- that we are analyzing not the original expression, but the generated |
3b23aaa0 | 11530 | -- expression in the body of the predicate function. This can include |
a360a0f7 | 11531 | -- references to inherited predicates, so that the expression we are |
3b23aaa0 | 11532 | -- processing looks like: |
11533 | ||
11534 | -- expression and then xxPredicate (typ (Inns)) | |
11535 | ||
11536 | -- Where the call is to a Predicate function for an inherited predicate. | |
60a4a5af | 11537 | -- We simply ignore such a call, which could be to either a dynamic or |
11538 | -- a static predicate. Note that if the parent predicate is dynamic then | |
11539 | -- eventually this type will be marked as dynamic, but you are allowed | |
11540 | -- to specify a static predicate for a subtype which is inheriting a | |
11541 | -- dynamic predicate, so the static predicate validation here ignores | |
11542 | -- the inherited predicate even if it is dynamic. | |
3b23aaa0 | 11543 | |
11544 | elsif Nkind (Expr) = N_Function_Call | |
11545 | and then Is_Predicate_Function (Entity (Name (Expr))) | |
11546 | then | |
11547 | return True; | |
11548 | ||
11549 | -- That's an exhaustive list of tests, all other cases are not | |
a360a0f7 | 11550 | -- predicate-static, so we return False. |
3b23aaa0 | 11551 | |
11552 | else | |
11553 | return False; | |
11554 | end if; | |
11555 | end Is_Predicate_Static; | |
11556 | ||
2ff55065 | 11557 | --------------------- |
11558 | -- Kill_Rep_Clause -- | |
11559 | --------------------- | |
11560 | ||
11561 | procedure Kill_Rep_Clause (N : Node_Id) is | |
11562 | begin | |
11563 | pragma Assert (Ignore_Rep_Clauses); | |
360f426f | 11564 | |
11565 | -- Note: we use Replace rather than Rewrite, because we don't want | |
11566 | -- ASIS to be able to use Original_Node to dig out the (undecorated) | |
11567 | -- rep clause that is being replaced. | |
11568 | ||
4949ddd5 | 11569 | Replace (N, Make_Null_Statement (Sloc (N))); |
360f426f | 11570 | |
11571 | -- The null statement must be marked as not coming from source. This is | |
37c6552c | 11572 | -- so that ASIS ignores it, and also the back end does not expect bogus |
360f426f | 11573 | -- "from source" null statements in weird places (e.g. in declarative |
11574 | -- regions where such null statements are not allowed). | |
11575 | ||
11576 | Set_Comes_From_Source (N, False); | |
2ff55065 | 11577 | end Kill_Rep_Clause; |
11578 | ||
d6f39728 | 11579 | ------------------ |
11580 | -- Minimum_Size -- | |
11581 | ------------------ | |
11582 | ||
11583 | function Minimum_Size | |
11584 | (T : Entity_Id; | |
d5b349fa | 11585 | Biased : Boolean := False) return Nat |
d6f39728 | 11586 | is |
11587 | Lo : Uint := No_Uint; | |
11588 | Hi : Uint := No_Uint; | |
11589 | LoR : Ureal := No_Ureal; | |
11590 | HiR : Ureal := No_Ureal; | |
11591 | LoSet : Boolean := False; | |
11592 | HiSet : Boolean := False; | |
11593 | B : Uint; | |
11594 | S : Nat; | |
11595 | Ancest : Entity_Id; | |
f15731c4 | 11596 | R_Typ : constant Entity_Id := Root_Type (T); |
d6f39728 | 11597 | |
11598 | begin | |
11599 | -- If bad type, return 0 | |
11600 | ||
11601 | if T = Any_Type then | |
11602 | return 0; | |
11603 | ||
11604 | -- For generic types, just return zero. There cannot be any legitimate | |
11605 | -- need to know such a size, but this routine may be called with a | |
11606 | -- generic type as part of normal processing. | |
11607 | ||
f02a9a9a | 11608 | elsif Is_Generic_Type (R_Typ) or else R_Typ = Any_Type then |
d6f39728 | 11609 | return 0; |
11610 | ||
74c7ae52 | 11611 | -- Access types (cannot have size smaller than System.Address) |
d6f39728 | 11612 | |
11613 | elsif Is_Access_Type (T) then | |
74c7ae52 | 11614 | return System_Address_Size; |
d6f39728 | 11615 | |
11616 | -- Floating-point types | |
11617 | ||
11618 | elsif Is_Floating_Point_Type (T) then | |
f15731c4 | 11619 | return UI_To_Int (Esize (R_Typ)); |
d6f39728 | 11620 | |
11621 | -- Discrete types | |
11622 | ||
11623 | elsif Is_Discrete_Type (T) then | |
11624 | ||
fdd294d1 | 11625 | -- The following loop is looking for the nearest compile time known |
11626 | -- bounds following the ancestor subtype chain. The idea is to find | |
11627 | -- the most restrictive known bounds information. | |
d6f39728 | 11628 | |
11629 | Ancest := T; | |
11630 | loop | |
11631 | if Ancest = Any_Type or else Etype (Ancest) = Any_Type then | |
11632 | return 0; | |
11633 | end if; | |
11634 | ||
11635 | if not LoSet then | |
11636 | if Compile_Time_Known_Value (Type_Low_Bound (Ancest)) then | |
11637 | Lo := Expr_Rep_Value (Type_Low_Bound (Ancest)); | |
11638 | LoSet := True; | |
11639 | exit when HiSet; | |
11640 | end if; | |
11641 | end if; | |
11642 | ||
11643 | if not HiSet then | |
11644 | if Compile_Time_Known_Value (Type_High_Bound (Ancest)) then | |
11645 | Hi := Expr_Rep_Value (Type_High_Bound (Ancest)); | |
11646 | HiSet := True; | |
11647 | exit when LoSet; | |
11648 | end if; | |
11649 | end if; | |
11650 | ||
11651 | Ancest := Ancestor_Subtype (Ancest); | |
11652 | ||
11653 | if No (Ancest) then | |
11654 | Ancest := Base_Type (T); | |
11655 | ||
11656 | if Is_Generic_Type (Ancest) then | |
11657 | return 0; | |
11658 | end if; | |
11659 | end if; | |
11660 | end loop; | |
11661 | ||
11662 | -- Fixed-point types. We can't simply use Expr_Value to get the | |
fdd294d1 | 11663 | -- Corresponding_Integer_Value values of the bounds, since these do not |
11664 | -- get set till the type is frozen, and this routine can be called | |
11665 | -- before the type is frozen. Similarly the test for bounds being static | |
11666 | -- needs to include the case where we have unanalyzed real literals for | |
11667 | -- the same reason. | |
d6f39728 | 11668 | |
11669 | elsif Is_Fixed_Point_Type (T) then | |
11670 | ||
fdd294d1 | 11671 | -- The following loop is looking for the nearest compile time known |
11672 | -- bounds following the ancestor subtype chain. The idea is to find | |
11673 | -- the most restrictive known bounds information. | |
d6f39728 | 11674 | |
11675 | Ancest := T; | |
11676 | loop | |
11677 | if Ancest = Any_Type or else Etype (Ancest) = Any_Type then | |
11678 | return 0; | |
11679 | end if; | |
11680 | ||
3062c401 | 11681 | -- Note: In the following two tests for LoSet and HiSet, it may |
11682 | -- seem redundant to test for N_Real_Literal here since normally | |
11683 | -- one would assume that the test for the value being known at | |
11684 | -- compile time includes this case. However, there is a glitch. | |
11685 | -- If the real literal comes from folding a non-static expression, | |
11686 | -- then we don't consider any non- static expression to be known | |
11687 | -- at compile time if we are in configurable run time mode (needed | |
11688 | -- in some cases to give a clearer definition of what is and what | |
11689 | -- is not accepted). So the test is indeed needed. Without it, we | |
11690 | -- would set neither Lo_Set nor Hi_Set and get an infinite loop. | |
11691 | ||
d6f39728 | 11692 | if not LoSet then |
11693 | if Nkind (Type_Low_Bound (Ancest)) = N_Real_Literal | |
11694 | or else Compile_Time_Known_Value (Type_Low_Bound (Ancest)) | |
11695 | then | |
11696 | LoR := Expr_Value_R (Type_Low_Bound (Ancest)); | |
11697 | LoSet := True; | |
11698 | exit when HiSet; | |
11699 | end if; | |
11700 | end if; | |
11701 | ||
11702 | if not HiSet then | |
11703 | if Nkind (Type_High_Bound (Ancest)) = N_Real_Literal | |
11704 | or else Compile_Time_Known_Value (Type_High_Bound (Ancest)) | |
11705 | then | |
11706 | HiR := Expr_Value_R (Type_High_Bound (Ancest)); | |
11707 | HiSet := True; | |
11708 | exit when LoSet; | |
11709 | end if; | |
11710 | end if; | |
11711 | ||
11712 | Ancest := Ancestor_Subtype (Ancest); | |
11713 | ||
11714 | if No (Ancest) then | |
11715 | Ancest := Base_Type (T); | |
11716 | ||
11717 | if Is_Generic_Type (Ancest) then | |
11718 | return 0; | |
11719 | end if; | |
11720 | end if; | |
11721 | end loop; | |
11722 | ||
11723 | Lo := UR_To_Uint (LoR / Small_Value (T)); | |
11724 | Hi := UR_To_Uint (HiR / Small_Value (T)); | |
11725 | ||
11726 | -- No other types allowed | |
11727 | ||
11728 | else | |
11729 | raise Program_Error; | |
11730 | end if; | |
11731 | ||
2866d595 | 11732 | -- Fall through with Hi and Lo set. Deal with biased case |
d6f39728 | 11733 | |
cc46ff4b | 11734 | if (Biased |
11735 | and then not Is_Fixed_Point_Type (T) | |
11736 | and then not (Is_Enumeration_Type (T) | |
11737 | and then Has_Non_Standard_Rep (T))) | |
d6f39728 | 11738 | or else Has_Biased_Representation (T) |
11739 | then | |
11740 | Hi := Hi - Lo; | |
11741 | Lo := Uint_0; | |
11742 | end if; | |
11743 | ||
005366f7 | 11744 | -- Null range case, size is always zero. We only do this in the discrete |
11745 | -- type case, since that's the odd case that came up. Probably we should | |
11746 | -- also do this in the fixed-point case, but doing so causes peculiar | |
11747 | -- gigi failures, and it is not worth worrying about this incredibly | |
11748 | -- marginal case (explicit null-range fixed-point type declarations)??? | |
11749 | ||
11750 | if Lo > Hi and then Is_Discrete_Type (T) then | |
11751 | S := 0; | |
11752 | ||
d6f39728 | 11753 | -- Signed case. Note that we consider types like range 1 .. -1 to be |
fdd294d1 | 11754 | -- signed for the purpose of computing the size, since the bounds have |
1a34e48c | 11755 | -- to be accommodated in the base type. |
d6f39728 | 11756 | |
005366f7 | 11757 | elsif Lo < 0 or else Hi < 0 then |
d6f39728 | 11758 | S := 1; |
11759 | B := Uint_1; | |
11760 | ||
da253936 | 11761 | -- S = size, B = 2 ** (size - 1) (can accommodate -B .. +(B - 1)) |
11762 | -- Note that we accommodate the case where the bounds cross. This | |
d6f39728 | 11763 | -- can happen either because of the way the bounds are declared |
11764 | -- or because of the algorithm in Freeze_Fixed_Point_Type. | |
11765 | ||
11766 | while Lo < -B | |
11767 | or else Hi < -B | |
11768 | or else Lo >= B | |
11769 | or else Hi >= B | |
11770 | loop | |
11771 | B := Uint_2 ** S; | |
11772 | S := S + 1; | |
11773 | end loop; | |
11774 | ||
11775 | -- Unsigned case | |
11776 | ||
11777 | else | |
11778 | -- If both bounds are positive, make sure that both are represen- | |
11779 | -- table in the case where the bounds are crossed. This can happen | |
11780 | -- either because of the way the bounds are declared, or because of | |
11781 | -- the algorithm in Freeze_Fixed_Point_Type. | |
11782 | ||
11783 | if Lo > Hi then | |
11784 | Hi := Lo; | |
11785 | end if; | |
11786 | ||
da253936 | 11787 | -- S = size, (can accommodate 0 .. (2**size - 1)) |
d6f39728 | 11788 | |
11789 | S := 0; | |
11790 | while Hi >= Uint_2 ** S loop | |
11791 | S := S + 1; | |
11792 | end loop; | |
11793 | end if; | |
11794 | ||
11795 | return S; | |
11796 | end Minimum_Size; | |
11797 | ||
44e4341e | 11798 | --------------------------- |
11799 | -- New_Stream_Subprogram -- | |
11800 | --------------------------- | |
d6f39728 | 11801 | |
44e4341e | 11802 | procedure New_Stream_Subprogram |
11803 | (N : Node_Id; | |
11804 | Ent : Entity_Id; | |
11805 | Subp : Entity_Id; | |
11806 | Nam : TSS_Name_Type) | |
d6f39728 | 11807 | is |
11808 | Loc : constant Source_Ptr := Sloc (N); | |
9dfe12ae | 11809 | Sname : constant Name_Id := Make_TSS_Name (Base_Type (Ent), Nam); |
f15731c4 | 11810 | Subp_Id : Entity_Id; |
d6f39728 | 11811 | Subp_Decl : Node_Id; |
11812 | F : Entity_Id; | |
11813 | Etyp : Entity_Id; | |
11814 | ||
44e4341e | 11815 | Defer_Declaration : constant Boolean := |
11816 | Is_Tagged_Type (Ent) or else Is_Private_Type (Ent); | |
11817 | -- For a tagged type, there is a declaration for each stream attribute | |
11818 | -- at the freeze point, and we must generate only a completion of this | |
11819 | -- declaration. We do the same for private types, because the full view | |
11820 | -- might be tagged. Otherwise we generate a declaration at the point of | |
11821 | -- the attribute definition clause. | |
11822 | ||
f15731c4 | 11823 | function Build_Spec return Node_Id; |
11824 | -- Used for declaration and renaming declaration, so that this is | |
11825 | -- treated as a renaming_as_body. | |
11826 | ||
11827 | ---------------- | |
11828 | -- Build_Spec -- | |
11829 | ---------------- | |
11830 | ||
d5b349fa | 11831 | function Build_Spec return Node_Id is |
44e4341e | 11832 | Out_P : constant Boolean := (Nam = TSS_Stream_Read); |
11833 | Formals : List_Id; | |
11834 | Spec : Node_Id; | |
83c6c069 | 11835 | T_Ref : constant Node_Id := New_Occurrence_Of (Etyp, Loc); |
44e4341e | 11836 | |
f15731c4 | 11837 | begin |
9dfe12ae | 11838 | Subp_Id := Make_Defining_Identifier (Loc, Sname); |
f15731c4 | 11839 | |
44e4341e | 11840 | -- S : access Root_Stream_Type'Class |
11841 | ||
11842 | Formals := New_List ( | |
11843 | Make_Parameter_Specification (Loc, | |
11844 | Defining_Identifier => | |
11845 | Make_Defining_Identifier (Loc, Name_S), | |
11846 | Parameter_Type => | |
11847 | Make_Access_Definition (Loc, | |
11848 | Subtype_Mark => | |
83c6c069 | 11849 | New_Occurrence_Of ( |
44e4341e | 11850 | Designated_Type (Etype (F)), Loc)))); |
11851 | ||
11852 | if Nam = TSS_Stream_Input then | |
4bba0a8d | 11853 | Spec := |
11854 | Make_Function_Specification (Loc, | |
11855 | Defining_Unit_Name => Subp_Id, | |
11856 | Parameter_Specifications => Formals, | |
11857 | Result_Definition => T_Ref); | |
44e4341e | 11858 | else |
11859 | -- V : [out] T | |
f15731c4 | 11860 | |
44e4341e | 11861 | Append_To (Formals, |
11862 | Make_Parameter_Specification (Loc, | |
11863 | Defining_Identifier => Make_Defining_Identifier (Loc, Name_V), | |
11864 | Out_Present => Out_P, | |
11865 | Parameter_Type => T_Ref)); | |
f15731c4 | 11866 | |
d3ef794c | 11867 | Spec := |
11868 | Make_Procedure_Specification (Loc, | |
11869 | Defining_Unit_Name => Subp_Id, | |
11870 | Parameter_Specifications => Formals); | |
44e4341e | 11871 | end if; |
f15731c4 | 11872 | |
44e4341e | 11873 | return Spec; |
11874 | end Build_Spec; | |
d6f39728 | 11875 | |
44e4341e | 11876 | -- Start of processing for New_Stream_Subprogram |
d6f39728 | 11877 | |
44e4341e | 11878 | begin |
11879 | F := First_Formal (Subp); | |
11880 | ||
11881 | if Ekind (Subp) = E_Procedure then | |
11882 | Etyp := Etype (Next_Formal (F)); | |
d6f39728 | 11883 | else |
44e4341e | 11884 | Etyp := Etype (Subp); |
d6f39728 | 11885 | end if; |
f15731c4 | 11886 | |
44e4341e | 11887 | -- Prepare subprogram declaration and insert it as an action on the |
11888 | -- clause node. The visibility for this entity is used to test for | |
11889 | -- visibility of the attribute definition clause (in the sense of | |
11890 | -- 8.3(23) as amended by AI-195). | |
9dfe12ae | 11891 | |
44e4341e | 11892 | if not Defer_Declaration then |
f15731c4 | 11893 | Subp_Decl := |
11894 | Make_Subprogram_Declaration (Loc, | |
11895 | Specification => Build_Spec); | |
44e4341e | 11896 | |
11897 | -- For a tagged type, there is always a visible declaration for each | |
15ebb600 | 11898 | -- stream TSS (it is a predefined primitive operation), and the |
44e4341e | 11899 | -- completion of this declaration occurs at the freeze point, which is |
11900 | -- not always visible at places where the attribute definition clause is | |
11901 | -- visible. So, we create a dummy entity here for the purpose of | |
11902 | -- tracking the visibility of the attribute definition clause itself. | |
11903 | ||
11904 | else | |
11905 | Subp_Id := | |
55868293 | 11906 | Make_Defining_Identifier (Loc, New_External_Name (Sname, 'V')); |
44e4341e | 11907 | Subp_Decl := |
11908 | Make_Object_Declaration (Loc, | |
11909 | Defining_Identifier => Subp_Id, | |
11910 | Object_Definition => New_Occurrence_Of (Standard_Boolean, Loc)); | |
f15731c4 | 11911 | end if; |
11912 | ||
44e4341e | 11913 | Insert_Action (N, Subp_Decl); |
11914 | Set_Entity (N, Subp_Id); | |
11915 | ||
d6f39728 | 11916 | Subp_Decl := |
11917 | Make_Subprogram_Renaming_Declaration (Loc, | |
f15731c4 | 11918 | Specification => Build_Spec, |
83c6c069 | 11919 | Name => New_Occurrence_Of (Subp, Loc)); |
d6f39728 | 11920 | |
44e4341e | 11921 | if Defer_Declaration then |
d6f39728 | 11922 | Set_TSS (Base_Type (Ent), Subp_Id); |
11923 | else | |
11924 | Insert_Action (N, Subp_Decl); | |
11925 | Copy_TSS (Subp_Id, Base_Type (Ent)); | |
11926 | end if; | |
44e4341e | 11927 | end New_Stream_Subprogram; |
d6f39728 | 11928 | |
2625eb01 | 11929 | ------------------------------------------ |
11930 | -- Push_Scope_And_Install_Discriminants -- | |
11931 | ------------------------------------------ | |
11932 | ||
11933 | procedure Push_Scope_And_Install_Discriminants (E : Entity_Id) is | |
11934 | begin | |
11935 | if Has_Discriminants (E) then | |
11936 | Push_Scope (E); | |
11937 | ||
11938 | -- Make discriminants visible for type declarations and protected | |
11939 | -- type declarations, not for subtype declarations (RM 13.1.1 (12/3)) | |
11940 | ||
11941 | if Nkind (Parent (E)) /= N_Subtype_Declaration then | |
11942 | Install_Discriminants (E); | |
11943 | end if; | |
11944 | end if; | |
11945 | end Push_Scope_And_Install_Discriminants; | |
11946 | ||
d6f39728 | 11947 | ------------------------ |
11948 | -- Rep_Item_Too_Early -- | |
11949 | ------------------------ | |
11950 | ||
80d4fec4 | 11951 | function Rep_Item_Too_Early (T : Entity_Id; N : Node_Id) return Boolean is |
d6f39728 | 11952 | begin |
44e4341e | 11953 | -- Cannot apply non-operational rep items to generic types |
d6f39728 | 11954 | |
f15731c4 | 11955 | if Is_Operational_Item (N) then |
11956 | return False; | |
11957 | ||
11958 | elsif Is_Type (T) | |
d6f39728 | 11959 | and then Is_Generic_Type (Root_Type (T)) |
e17c5076 | 11960 | and then (Nkind (N) /= N_Pragma |
11961 | or else Get_Pragma_Id (N) /= Pragma_Convention) | |
d6f39728 | 11962 | then |
503f7fd3 | 11963 | Error_Msg_N ("representation item not allowed for generic type", N); |
d6f39728 | 11964 | return True; |
11965 | end if; | |
11966 | ||
fdd294d1 | 11967 | -- Otherwise check for incomplete type |
d6f39728 | 11968 | |
11969 | if Is_Incomplete_Or_Private_Type (T) | |
11970 | and then No (Underlying_Type (T)) | |
d64221a7 | 11971 | and then |
11972 | (Nkind (N) /= N_Pragma | |
60014bc9 | 11973 | or else Get_Pragma_Id (N) /= Pragma_Import) |
d6f39728 | 11974 | then |
11975 | Error_Msg_N | |
11976 | ("representation item must be after full type declaration", N); | |
11977 | return True; | |
11978 | ||
1a34e48c | 11979 | -- If the type has incomplete components, a representation clause is |
d6f39728 | 11980 | -- illegal but stream attributes and Convention pragmas are correct. |
11981 | ||
11982 | elsif Has_Private_Component (T) then | |
f15731c4 | 11983 | if Nkind (N) = N_Pragma then |
d6f39728 | 11984 | return False; |
b9e61b2a | 11985 | |
d6f39728 | 11986 | else |
11987 | Error_Msg_N | |
11988 | ("representation item must appear after type is fully defined", | |
11989 | N); | |
11990 | return True; | |
11991 | end if; | |
11992 | else | |
11993 | return False; | |
11994 | end if; | |
11995 | end Rep_Item_Too_Early; | |
11996 | ||
11997 | ----------------------- | |
11998 | -- Rep_Item_Too_Late -- | |
11999 | ----------------------- | |
12000 | ||
12001 | function Rep_Item_Too_Late | |
12002 | (T : Entity_Id; | |
12003 | N : Node_Id; | |
d5b349fa | 12004 | FOnly : Boolean := False) return Boolean |
d6f39728 | 12005 | is |
12006 | S : Entity_Id; | |
12007 | Parent_Type : Entity_Id; | |
12008 | ||
4d0944e9 | 12009 | procedure No_Type_Rep_Item; |
12010 | -- Output message indicating that no type-related aspects can be | |
12011 | -- specified due to some property of the parent type. | |
12012 | ||
d6f39728 | 12013 | procedure Too_Late; |
4d0944e9 | 12014 | -- Output message for an aspect being specified too late |
12015 | ||
12016 | -- Note that neither of the above errors is considered a serious one, | |
12017 | -- since the effect is simply that we ignore the representation clause | |
12018 | -- in these cases. | |
04d38ee4 | 12019 | -- Is this really true? In any case if we make this change we must |
12020 | -- document the requirement in the spec of Rep_Item_Too_Late that | |
12021 | -- if True is returned, then the rep item must be completely ignored??? | |
4d0944e9 | 12022 | |
12023 | ---------------------- | |
12024 | -- No_Type_Rep_Item -- | |
12025 | ---------------------- | |
12026 | ||
12027 | procedure No_Type_Rep_Item is | |
12028 | begin | |
12029 | Error_Msg_N ("|type-related representation item not permitted!", N); | |
12030 | end No_Type_Rep_Item; | |
d53a018a | 12031 | |
12032 | -------------- | |
12033 | -- Too_Late -- | |
12034 | -------------- | |
d6f39728 | 12035 | |
12036 | procedure Too_Late is | |
12037 | begin | |
ce4da1ed | 12038 | -- Other compilers seem more relaxed about rep items appearing too |
12039 | -- late. Since analysis tools typically don't care about rep items | |
12040 | -- anyway, no reason to be too strict about this. | |
12041 | ||
a9cd517c | 12042 | if not Relaxed_RM_Semantics then |
12043 | Error_Msg_N ("|representation item appears too late!", N); | |
12044 | end if; | |
d6f39728 | 12045 | end Too_Late; |
12046 | ||
12047 | -- Start of processing for Rep_Item_Too_Late | |
12048 | ||
12049 | begin | |
a3248fc4 | 12050 | -- First make sure entity is not frozen (RM 13.1(9)) |
d6f39728 | 12051 | |
12052 | if Is_Frozen (T) | |
a3248fc4 | 12053 | |
12054 | -- Exclude imported types, which may be frozen if they appear in a | |
12055 | -- representation clause for a local type. | |
12056 | ||
4aa270d8 | 12057 | and then not From_Limited_With (T) |
a3248fc4 | 12058 | |
a9cd517c | 12059 | -- Exclude generated entities (not coming from source). The common |
a3248fc4 | 12060 | -- case is when we generate a renaming which prematurely freezes the |
12061 | -- renamed internal entity, but we still want to be able to set copies | |
12062 | -- of attribute values such as Size/Alignment. | |
12063 | ||
12064 | and then Comes_From_Source (T) | |
d6f39728 | 12065 | then |
12066 | Too_Late; | |
12067 | S := First_Subtype (T); | |
12068 | ||
12069 | if Present (Freeze_Node (S)) then | |
04d38ee4 | 12070 | if not Relaxed_RM_Semantics then |
12071 | Error_Msg_NE | |
12072 | ("??no more representation items for }", Freeze_Node (S), S); | |
12073 | end if; | |
d6f39728 | 12074 | end if; |
12075 | ||
12076 | return True; | |
12077 | ||
d1a2e31b | 12078 | -- Check for case of untagged derived type whose parent either has |
4d0944e9 | 12079 | -- primitive operations, or is a by reference type (RM 13.1(10)). In |
12080 | -- this case we do not output a Too_Late message, since there is no | |
12081 | -- earlier point where the rep item could be placed to make it legal. | |
d6f39728 | 12082 | |
12083 | elsif Is_Type (T) | |
12084 | and then not FOnly | |
12085 | and then Is_Derived_Type (T) | |
12086 | and then not Is_Tagged_Type (T) | |
12087 | then | |
12088 | Parent_Type := Etype (Base_Type (T)); | |
12089 | ||
12090 | if Has_Primitive_Operations (Parent_Type) then | |
4d0944e9 | 12091 | No_Type_Rep_Item; |
04d38ee4 | 12092 | |
12093 | if not Relaxed_RM_Semantics then | |
12094 | Error_Msg_NE | |
12095 | ("\parent type & has primitive operations!", N, Parent_Type); | |
12096 | end if; | |
12097 | ||
d6f39728 | 12098 | return True; |
12099 | ||
12100 | elsif Is_By_Reference_Type (Parent_Type) then | |
4d0944e9 | 12101 | No_Type_Rep_Item; |
04d38ee4 | 12102 | |
12103 | if not Relaxed_RM_Semantics then | |
12104 | Error_Msg_NE | |
12105 | ("\parent type & is a by reference type!", N, Parent_Type); | |
12106 | end if; | |
12107 | ||
d6f39728 | 12108 | return True; |
12109 | end if; | |
12110 | end if; | |
12111 | ||
04d38ee4 | 12112 | -- No error, but one more warning to consider. The RM (surprisingly) |
12113 | -- allows this pattern: | |
12114 | ||
12115 | -- type S is ... | |
12116 | -- primitive operations for S | |
12117 | -- type R is new S; | |
12118 | -- rep clause for S | |
12119 | ||
12120 | -- Meaning that calls on the primitive operations of S for values of | |
12121 | -- type R may require possibly expensive implicit conversion operations. | |
12122 | -- This is not an error, but is worth a warning. | |
12123 | ||
12124 | if not Relaxed_RM_Semantics and then Is_Type (T) then | |
12125 | declare | |
12126 | DTL : constant Entity_Id := Derived_Type_Link (Base_Type (T)); | |
12127 | ||
12128 | begin | |
12129 | if Present (DTL) | |
12130 | and then Has_Primitive_Operations (Base_Type (T)) | |
12131 | ||
12132 | -- For now, do not generate this warning for the case of aspect | |
12133 | -- specification using Ada 2012 syntax, since we get wrong | |
12134 | -- messages we do not understand. The whole business of derived | |
12135 | -- types and rep items seems a bit confused when aspects are | |
12136 | -- used, since the aspects are not evaluated till freeze time. | |
12137 | ||
12138 | and then not From_Aspect_Specification (N) | |
12139 | then | |
12140 | Error_Msg_Sloc := Sloc (DTL); | |
12141 | Error_Msg_N | |
12142 | ("representation item for& appears after derived type " | |
12143 | & "declaration#??", N); | |
12144 | Error_Msg_NE | |
12145 | ("\may result in implicit conversions for primitive " | |
12146 | & "operations of&??", N, T); | |
12147 | Error_Msg_NE | |
12148 | ("\to change representations when called with arguments " | |
12149 | & "of type&??", N, DTL); | |
12150 | end if; | |
12151 | end; | |
12152 | end if; | |
12153 | ||
3062c401 | 12154 | -- No error, link item into head of chain of rep items for the entity, |
12155 | -- but avoid chaining if we have an overloadable entity, and the pragma | |
12156 | -- is one that can apply to multiple overloaded entities. | |
12157 | ||
b9e61b2a | 12158 | if Is_Overloadable (T) and then Nkind (N) = N_Pragma then |
fdd294d1 | 12159 | declare |
12160 | Pname : constant Name_Id := Pragma_Name (N); | |
12161 | begin | |
18393965 | 12162 | if Nam_In (Pname, Name_Convention, Name_Import, Name_Export, |
12163 | Name_External, Name_Interface) | |
fdd294d1 | 12164 | then |
12165 | return False; | |
12166 | end if; | |
12167 | end; | |
3062c401 | 12168 | end if; |
12169 | ||
fdd294d1 | 12170 | Record_Rep_Item (T, N); |
d6f39728 | 12171 | return False; |
12172 | end Rep_Item_Too_Late; | |
12173 | ||
2072eaa9 | 12174 | ------------------------------------- |
12175 | -- Replace_Type_References_Generic -- | |
12176 | ------------------------------------- | |
12177 | ||
37c6552c | 12178 | procedure Replace_Type_References_Generic (N : Node_Id; T : Entity_Id) is |
12179 | TName : constant Name_Id := Chars (T); | |
2072eaa9 | 12180 | |
12181 | function Replace_Node (N : Node_Id) return Traverse_Result; | |
12182 | -- Processes a single node in the traversal procedure below, checking | |
12183 | -- if node N should be replaced, and if so, doing the replacement. | |
12184 | ||
12185 | procedure Replace_Type_Refs is new Traverse_Proc (Replace_Node); | |
12186 | -- This instantiation provides the body of Replace_Type_References | |
12187 | ||
12188 | ------------------ | |
12189 | -- Replace_Node -- | |
12190 | ------------------ | |
12191 | ||
12192 | function Replace_Node (N : Node_Id) return Traverse_Result is | |
12193 | S : Entity_Id; | |
12194 | P : Node_Id; | |
12195 | ||
12196 | begin | |
12197 | -- Case of identifier | |
12198 | ||
12199 | if Nkind (N) = N_Identifier then | |
12200 | ||
37c6552c | 12201 | -- If not the type name, check whether it is a reference to |
12202 | -- some other type, which must be frozen before the predicate | |
12203 | -- function is analyzed, i.e. before the freeze node of the | |
12204 | -- type to which the predicate applies. | |
2072eaa9 | 12205 | |
12206 | if Chars (N) /= TName then | |
37c6552c | 12207 | if Present (Current_Entity (N)) |
12208 | and then Is_Type (Current_Entity (N)) | |
12209 | then | |
12210 | Freeze_Before (Freeze_Node (T), Current_Entity (N)); | |
12211 | end if; | |
12212 | ||
2072eaa9 | 12213 | return Skip; |
12214 | ||
12215 | -- Otherwise do the replacement and we are done with this node | |
12216 | ||
12217 | else | |
12218 | Replace_Type_Reference (N); | |
12219 | return Skip; | |
12220 | end if; | |
12221 | ||
12222 | -- Case of selected component (which is what a qualification | |
12223 | -- looks like in the unanalyzed tree, which is what we have. | |
12224 | ||
12225 | elsif Nkind (N) = N_Selected_Component then | |
12226 | ||
12227 | -- If selector name is not our type, keeping going (we might | |
12228 | -- still have an occurrence of the type in the prefix). | |
12229 | ||
12230 | if Nkind (Selector_Name (N)) /= N_Identifier | |
12231 | or else Chars (Selector_Name (N)) /= TName | |
12232 | then | |
12233 | return OK; | |
12234 | ||
12235 | -- Selector name is our type, check qualification | |
12236 | ||
12237 | else | |
12238 | -- Loop through scopes and prefixes, doing comparison | |
12239 | ||
12240 | S := Current_Scope; | |
12241 | P := Prefix (N); | |
12242 | loop | |
12243 | -- Continue if no more scopes or scope with no name | |
12244 | ||
12245 | if No (S) or else Nkind (S) not in N_Has_Chars then | |
12246 | return OK; | |
12247 | end if; | |
12248 | ||
12249 | -- Do replace if prefix is an identifier matching the | |
12250 | -- scope that we are currently looking at. | |
12251 | ||
12252 | if Nkind (P) = N_Identifier | |
12253 | and then Chars (P) = Chars (S) | |
12254 | then | |
12255 | Replace_Type_Reference (N); | |
12256 | return Skip; | |
12257 | end if; | |
12258 | ||
12259 | -- Go check scope above us if prefix is itself of the | |
12260 | -- form of a selected component, whose selector matches | |
12261 | -- the scope we are currently looking at. | |
12262 | ||
12263 | if Nkind (P) = N_Selected_Component | |
12264 | and then Nkind (Selector_Name (P)) = N_Identifier | |
12265 | and then Chars (Selector_Name (P)) = Chars (S) | |
12266 | then | |
12267 | S := Scope (S); | |
12268 | P := Prefix (P); | |
12269 | ||
12270 | -- For anything else, we don't have a match, so keep on | |
12271 | -- going, there are still some weird cases where we may | |
12272 | -- still have a replacement within the prefix. | |
12273 | ||
12274 | else | |
12275 | return OK; | |
12276 | end if; | |
12277 | end loop; | |
12278 | end if; | |
12279 | ||
ec6f6da5 | 12280 | -- Continue for any other node kind |
2072eaa9 | 12281 | |
12282 | else | |
12283 | return OK; | |
12284 | end if; | |
12285 | end Replace_Node; | |
12286 | ||
12287 | begin | |
12288 | Replace_Type_Refs (N); | |
12289 | end Replace_Type_References_Generic; | |
12290 | ||
d6f39728 | 12291 | ------------------------- |
12292 | -- Same_Representation -- | |
12293 | ------------------------- | |
12294 | ||
12295 | function Same_Representation (Typ1, Typ2 : Entity_Id) return Boolean is | |
12296 | T1 : constant Entity_Id := Underlying_Type (Typ1); | |
12297 | T2 : constant Entity_Id := Underlying_Type (Typ2); | |
12298 | ||
12299 | begin | |
12300 | -- A quick check, if base types are the same, then we definitely have | |
12301 | -- the same representation, because the subtype specific representation | |
12302 | -- attributes (Size and Alignment) do not affect representation from | |
12303 | -- the point of view of this test. | |
12304 | ||
12305 | if Base_Type (T1) = Base_Type (T2) then | |
12306 | return True; | |
12307 | ||
12308 | elsif Is_Private_Type (Base_Type (T2)) | |
12309 | and then Base_Type (T1) = Full_View (Base_Type (T2)) | |
12310 | then | |
12311 | return True; | |
12312 | end if; | |
12313 | ||
12314 | -- Tagged types never have differing representations | |
12315 | ||
12316 | if Is_Tagged_Type (T1) then | |
12317 | return True; | |
12318 | end if; | |
12319 | ||
12320 | -- Representations are definitely different if conventions differ | |
12321 | ||
12322 | if Convention (T1) /= Convention (T2) then | |
12323 | return False; | |
12324 | end if; | |
12325 | ||
ef0772bc | 12326 | -- Representations are different if component alignments or scalar |
12327 | -- storage orders differ. | |
d6f39728 | 12328 | |
12329 | if (Is_Record_Type (T1) or else Is_Array_Type (T1)) | |
726fd56a | 12330 | and then |
d6f39728 | 12331 | (Is_Record_Type (T2) or else Is_Array_Type (T2)) |
ef0772bc | 12332 | and then |
12333 | (Component_Alignment (T1) /= Component_Alignment (T2) | |
f02a9a9a | 12334 | or else Reverse_Storage_Order (T1) /= Reverse_Storage_Order (T2)) |
d6f39728 | 12335 | then |
12336 | return False; | |
12337 | end if; | |
12338 | ||
12339 | -- For arrays, the only real issue is component size. If we know the | |
12340 | -- component size for both arrays, and it is the same, then that's | |
12341 | -- good enough to know we don't have a change of representation. | |
12342 | ||
12343 | if Is_Array_Type (T1) then | |
12344 | if Known_Component_Size (T1) | |
12345 | and then Known_Component_Size (T2) | |
12346 | and then Component_Size (T1) = Component_Size (T2) | |
12347 | then | |
9f1130cc | 12348 | if VM_Target = No_VM then |
12349 | return True; | |
12350 | ||
12351 | -- In VM targets the representation of arrays with aliased | |
12352 | -- components differs from arrays with non-aliased components | |
12353 | ||
12354 | else | |
12355 | return Has_Aliased_Components (Base_Type (T1)) | |
0ba3592b | 12356 | = |
12357 | Has_Aliased_Components (Base_Type (T2)); | |
9f1130cc | 12358 | end if; |
d6f39728 | 12359 | end if; |
12360 | end if; | |
12361 | ||
12362 | -- Types definitely have same representation if neither has non-standard | |
12363 | -- representation since default representations are always consistent. | |
12364 | -- If only one has non-standard representation, and the other does not, | |
12365 | -- then we consider that they do not have the same representation. They | |
12366 | -- might, but there is no way of telling early enough. | |
12367 | ||
12368 | if Has_Non_Standard_Rep (T1) then | |
12369 | if not Has_Non_Standard_Rep (T2) then | |
12370 | return False; | |
12371 | end if; | |
12372 | else | |
12373 | return not Has_Non_Standard_Rep (T2); | |
12374 | end if; | |
12375 | ||
fdd294d1 | 12376 | -- Here the two types both have non-standard representation, and we need |
12377 | -- to determine if they have the same non-standard representation. | |
d6f39728 | 12378 | |
12379 | -- For arrays, we simply need to test if the component sizes are the | |
12380 | -- same. Pragma Pack is reflected in modified component sizes, so this | |
12381 | -- check also deals with pragma Pack. | |
12382 | ||
12383 | if Is_Array_Type (T1) then | |
12384 | return Component_Size (T1) = Component_Size (T2); | |
12385 | ||
12386 | -- Tagged types always have the same representation, because it is not | |
12387 | -- possible to specify different representations for common fields. | |
12388 | ||
12389 | elsif Is_Tagged_Type (T1) then | |
12390 | return True; | |
12391 | ||
12392 | -- Case of record types | |
12393 | ||
12394 | elsif Is_Record_Type (T1) then | |
12395 | ||
12396 | -- Packed status must conform | |
12397 | ||
12398 | if Is_Packed (T1) /= Is_Packed (T2) then | |
12399 | return False; | |
12400 | ||
12401 | -- Otherwise we must check components. Typ2 maybe a constrained | |
12402 | -- subtype with fewer components, so we compare the components | |
12403 | -- of the base types. | |
12404 | ||
12405 | else | |
12406 | Record_Case : declare | |
12407 | CD1, CD2 : Entity_Id; | |
12408 | ||
12409 | function Same_Rep return Boolean; | |
12410 | -- CD1 and CD2 are either components or discriminants. This | |
ef0772bc | 12411 | -- function tests whether they have the same representation. |
d6f39728 | 12412 | |
80d4fec4 | 12413 | -------------- |
12414 | -- Same_Rep -- | |
12415 | -------------- | |
12416 | ||
d6f39728 | 12417 | function Same_Rep return Boolean is |
12418 | begin | |
12419 | if No (Component_Clause (CD1)) then | |
12420 | return No (Component_Clause (CD2)); | |
d6f39728 | 12421 | else |
ef0772bc | 12422 | -- Note: at this point, component clauses have been |
12423 | -- normalized to the default bit order, so that the | |
12424 | -- comparison of Component_Bit_Offsets is meaningful. | |
12425 | ||
d6f39728 | 12426 | return |
12427 | Present (Component_Clause (CD2)) | |
12428 | and then | |
12429 | Component_Bit_Offset (CD1) = Component_Bit_Offset (CD2) | |
12430 | and then | |
12431 | Esize (CD1) = Esize (CD2); | |
12432 | end if; | |
12433 | end Same_Rep; | |
12434 | ||
1e35409d | 12435 | -- Start of processing for Record_Case |
d6f39728 | 12436 | |
12437 | begin | |
12438 | if Has_Discriminants (T1) then | |
d6f39728 | 12439 | |
9dfe12ae | 12440 | -- The number of discriminants may be different if the |
12441 | -- derived type has fewer (constrained by values). The | |
12442 | -- invisible discriminants retain the representation of | |
12443 | -- the original, so the discrepancy does not per se | |
12444 | -- indicate a different representation. | |
12445 | ||
b9e61b2a | 12446 | CD1 := First_Discriminant (T1); |
12447 | CD2 := First_Discriminant (T2); | |
12448 | while Present (CD1) and then Present (CD2) loop | |
d6f39728 | 12449 | if not Same_Rep then |
12450 | return False; | |
12451 | else | |
12452 | Next_Discriminant (CD1); | |
12453 | Next_Discriminant (CD2); | |
12454 | end if; | |
12455 | end loop; | |
12456 | end if; | |
12457 | ||
12458 | CD1 := First_Component (Underlying_Type (Base_Type (T1))); | |
12459 | CD2 := First_Component (Underlying_Type (Base_Type (T2))); | |
d6f39728 | 12460 | while Present (CD1) loop |
12461 | if not Same_Rep then | |
12462 | return False; | |
12463 | else | |
12464 | Next_Component (CD1); | |
12465 | Next_Component (CD2); | |
12466 | end if; | |
12467 | end loop; | |
12468 | ||
12469 | return True; | |
12470 | end Record_Case; | |
12471 | end if; | |
12472 | ||
12473 | -- For enumeration types, we must check each literal to see if the | |
12474 | -- representation is the same. Note that we do not permit enumeration | |
1a34e48c | 12475 | -- representation clauses for Character and Wide_Character, so these |
d6f39728 | 12476 | -- cases were already dealt with. |
12477 | ||
12478 | elsif Is_Enumeration_Type (T1) then | |
d6f39728 | 12479 | Enumeration_Case : declare |
12480 | L1, L2 : Entity_Id; | |
12481 | ||
12482 | begin | |
12483 | L1 := First_Literal (T1); | |
12484 | L2 := First_Literal (T2); | |
d6f39728 | 12485 | while Present (L1) loop |
12486 | if Enumeration_Rep (L1) /= Enumeration_Rep (L2) then | |
12487 | return False; | |
12488 | else | |
12489 | Next_Literal (L1); | |
12490 | Next_Literal (L2); | |
12491 | end if; | |
12492 | end loop; | |
12493 | ||
12494 | return True; | |
d6f39728 | 12495 | end Enumeration_Case; |
12496 | ||
12497 | -- Any other types have the same representation for these purposes | |
12498 | ||
12499 | else | |
12500 | return True; | |
12501 | end if; | |
d6f39728 | 12502 | end Same_Representation; |
12503 | ||
3061ffde | 12504 | -------------------------------- |
12505 | -- Resolve_Iterable_Operation -- | |
12506 | -------------------------------- | |
12507 | ||
12508 | procedure Resolve_Iterable_Operation | |
12509 | (N : Node_Id; | |
12510 | Cursor : Entity_Id; | |
12511 | Typ : Entity_Id; | |
12512 | Nam : Name_Id) | |
12513 | is | |
12514 | Ent : Entity_Id; | |
12515 | F1 : Entity_Id; | |
12516 | F2 : Entity_Id; | |
12517 | ||
12518 | begin | |
12519 | if not Is_Overloaded (N) then | |
12520 | if not Is_Entity_Name (N) | |
12521 | or else Ekind (Entity (N)) /= E_Function | |
12522 | or else Scope (Entity (N)) /= Scope (Typ) | |
12523 | or else No (First_Formal (Entity (N))) | |
12524 | or else Etype (First_Formal (Entity (N))) /= Typ | |
12525 | then | |
12526 | Error_Msg_N ("iterable primitive must be local function name " | |
12527 | & "whose first formal is an iterable type", N); | |
a9f5fea7 | 12528 | return; |
3061ffde | 12529 | end if; |
12530 | ||
12531 | Ent := Entity (N); | |
12532 | F1 := First_Formal (Ent); | |
12533 | if Nam = Name_First then | |
12534 | ||
12535 | -- First (Container) => Cursor | |
12536 | ||
12537 | if Etype (Ent) /= Cursor then | |
12538 | Error_Msg_N ("primitive for First must yield a curosr", N); | |
12539 | end if; | |
12540 | ||
12541 | elsif Nam = Name_Next then | |
12542 | ||
12543 | -- Next (Container, Cursor) => Cursor | |
12544 | ||
12545 | F2 := Next_Formal (F1); | |
12546 | ||
12547 | if Etype (F2) /= Cursor | |
12548 | or else Etype (Ent) /= Cursor | |
12549 | or else Present (Next_Formal (F2)) | |
12550 | then | |
12551 | Error_Msg_N ("no match for Next iterable primitive", N); | |
12552 | end if; | |
12553 | ||
12554 | elsif Nam = Name_Has_Element then | |
12555 | ||
12556 | -- Has_Element (Container, Cursor) => Boolean | |
12557 | ||
12558 | F2 := Next_Formal (F1); | |
12559 | if Etype (F2) /= Cursor | |
12560 | or else Etype (Ent) /= Standard_Boolean | |
12561 | or else Present (Next_Formal (F2)) | |
12562 | then | |
12563 | Error_Msg_N ("no match for Has_Element iterable primitive", N); | |
12564 | end if; | |
12565 | ||
12566 | elsif Nam = Name_Element then | |
b9b03799 | 12567 | F2 := Next_Formal (F1); |
12568 | ||
12569 | if No (F2) | |
12570 | or else Etype (F2) /= Cursor | |
12571 | or else Present (Next_Formal (F2)) | |
12572 | then | |
12573 | Error_Msg_N ("no match for Element iterable primitive", N); | |
12574 | end if; | |
3061ffde | 12575 | null; |
12576 | ||
12577 | else | |
12578 | raise Program_Error; | |
12579 | end if; | |
12580 | ||
12581 | else | |
12582 | -- Overloaded case: find subprogram with proper signature. | |
12583 | -- Caller will report error if no match is found. | |
12584 | ||
12585 | declare | |
12586 | I : Interp_Index; | |
12587 | It : Interp; | |
12588 | ||
12589 | begin | |
12590 | Get_First_Interp (N, I, It); | |
12591 | while Present (It.Typ) loop | |
12592 | if Ekind (It.Nam) = E_Function | |
b9b03799 | 12593 | and then Scope (It.Nam) = Scope (Typ) |
3061ffde | 12594 | and then Etype (First_Formal (It.Nam)) = Typ |
12595 | then | |
12596 | F1 := First_Formal (It.Nam); | |
12597 | ||
12598 | if Nam = Name_First then | |
12599 | if Etype (It.Nam) = Cursor | |
12600 | and then No (Next_Formal (F1)) | |
12601 | then | |
12602 | Set_Entity (N, It.Nam); | |
12603 | exit; | |
12604 | end if; | |
12605 | ||
12606 | elsif Nam = Name_Next then | |
12607 | F2 := Next_Formal (F1); | |
12608 | ||
12609 | if Present (F2) | |
12610 | and then No (Next_Formal (F2)) | |
12611 | and then Etype (F2) = Cursor | |
12612 | and then Etype (It.Nam) = Cursor | |
12613 | then | |
12614 | Set_Entity (N, It.Nam); | |
12615 | exit; | |
12616 | end if; | |
12617 | ||
12618 | elsif Nam = Name_Has_Element then | |
12619 | F2 := Next_Formal (F1); | |
12620 | ||
12621 | if Present (F2) | |
12622 | and then No (Next_Formal (F2)) | |
12623 | and then Etype (F2) = Cursor | |
12624 | and then Etype (It.Nam) = Standard_Boolean | |
12625 | then | |
12626 | Set_Entity (N, It.Nam); | |
12627 | F2 := Next_Formal (F1); | |
12628 | exit; | |
12629 | end if; | |
12630 | ||
12631 | elsif Nam = Name_Element then | |
b9b03799 | 12632 | F2 := Next_Formal (F1); |
12633 | ||
3061ffde | 12634 | if Present (F2) |
12635 | and then No (Next_Formal (F2)) | |
12636 | and then Etype (F2) = Cursor | |
12637 | then | |
12638 | Set_Entity (N, It.Nam); | |
12639 | exit; | |
12640 | end if; | |
12641 | end if; | |
12642 | end if; | |
12643 | ||
12644 | Get_Next_Interp (I, It); | |
12645 | end loop; | |
12646 | end; | |
12647 | end if; | |
12648 | end Resolve_Iterable_Operation; | |
12649 | ||
b77e4501 | 12650 | ---------------- |
12651 | -- Set_Biased -- | |
12652 | ---------------- | |
12653 | ||
12654 | procedure Set_Biased | |
12655 | (E : Entity_Id; | |
12656 | N : Node_Id; | |
12657 | Msg : String; | |
12658 | Biased : Boolean := True) | |
12659 | is | |
12660 | begin | |
12661 | if Biased then | |
12662 | Set_Has_Biased_Representation (E); | |
12663 | ||
12664 | if Warn_On_Biased_Representation then | |
12665 | Error_Msg_NE | |
1e3532e7 | 12666 | ("?B?" & Msg & " forces biased representation for&", N, E); |
b77e4501 | 12667 | end if; |
12668 | end if; | |
12669 | end Set_Biased; | |
12670 | ||
d6f39728 | 12671 | -------------------- |
12672 | -- Set_Enum_Esize -- | |
12673 | -------------------- | |
12674 | ||
12675 | procedure Set_Enum_Esize (T : Entity_Id) is | |
12676 | Lo : Uint; | |
12677 | Hi : Uint; | |
12678 | Sz : Nat; | |
12679 | ||
12680 | begin | |
12681 | Init_Alignment (T); | |
12682 | ||
12683 | -- Find the minimum standard size (8,16,32,64) that fits | |
12684 | ||
12685 | Lo := Enumeration_Rep (Entity (Type_Low_Bound (T))); | |
12686 | Hi := Enumeration_Rep (Entity (Type_High_Bound (T))); | |
12687 | ||
12688 | if Lo < 0 then | |
12689 | if Lo >= -Uint_2**07 and then Hi < Uint_2**07 then | |
f15731c4 | 12690 | Sz := Standard_Character_Size; -- May be > 8 on some targets |
d6f39728 | 12691 | |
12692 | elsif Lo >= -Uint_2**15 and then Hi < Uint_2**15 then | |
12693 | Sz := 16; | |
12694 | ||
12695 | elsif Lo >= -Uint_2**31 and then Hi < Uint_2**31 then | |
12696 | Sz := 32; | |
12697 | ||
12698 | else pragma Assert (Lo >= -Uint_2**63 and then Hi < Uint_2**63); | |
12699 | Sz := 64; | |
12700 | end if; | |
12701 | ||
12702 | else | |
12703 | if Hi < Uint_2**08 then | |
f15731c4 | 12704 | Sz := Standard_Character_Size; -- May be > 8 on some targets |
d6f39728 | 12705 | |
12706 | elsif Hi < Uint_2**16 then | |
12707 | Sz := 16; | |
12708 | ||
12709 | elsif Hi < Uint_2**32 then | |
12710 | Sz := 32; | |
12711 | ||
12712 | else pragma Assert (Hi < Uint_2**63); | |
12713 | Sz := 64; | |
12714 | end if; | |
12715 | end if; | |
12716 | ||
12717 | -- That minimum is the proper size unless we have a foreign convention | |
12718 | -- and the size required is 32 or less, in which case we bump the size | |
12719 | -- up to 32. This is required for C and C++ and seems reasonable for | |
12720 | -- all other foreign conventions. | |
12721 | ||
12722 | if Has_Foreign_Convention (T) | |
12723 | and then Esize (T) < Standard_Integer_Size | |
db1eed69 | 12724 | |
12725 | -- Don't do this if Short_Enums on target | |
12726 | ||
e9185b9d | 12727 | and then not Target_Short_Enums |
d6f39728 | 12728 | then |
12729 | Init_Esize (T, Standard_Integer_Size); | |
d6f39728 | 12730 | else |
12731 | Init_Esize (T, Sz); | |
12732 | end if; | |
d6f39728 | 12733 | end Set_Enum_Esize; |
12734 | ||
2625eb01 | 12735 | ----------------------------- |
12736 | -- Uninstall_Discriminants -- | |
12737 | ----------------------------- | |
12738 | ||
12739 | procedure Uninstall_Discriminants (E : Entity_Id) is | |
12740 | Disc : Entity_Id; | |
12741 | Prev : Entity_Id; | |
12742 | Outer : Entity_Id; | |
12743 | ||
12744 | begin | |
12745 | -- Discriminants have been made visible for type declarations and | |
12746 | -- protected type declarations, not for subtype declarations. | |
12747 | ||
12748 | if Nkind (Parent (E)) /= N_Subtype_Declaration then | |
12749 | Disc := First_Discriminant (E); | |
12750 | while Present (Disc) loop | |
12751 | if Disc /= Current_Entity (Disc) then | |
12752 | Prev := Current_Entity (Disc); | |
12753 | while Present (Prev) | |
12754 | and then Present (Homonym (Prev)) | |
12755 | and then Homonym (Prev) /= Disc | |
12756 | loop | |
12757 | Prev := Homonym (Prev); | |
12758 | end loop; | |
12759 | else | |
12760 | Prev := Empty; | |
12761 | end if; | |
12762 | ||
12763 | Set_Is_Immediately_Visible (Disc, False); | |
12764 | ||
12765 | Outer := Homonym (Disc); | |
12766 | while Present (Outer) and then Scope (Outer) = E loop | |
12767 | Outer := Homonym (Outer); | |
12768 | end loop; | |
12769 | ||
12770 | -- Reset homonym link of other entities, but do not modify link | |
12771 | -- between entities in current scope, so that the back-end can | |
12772 | -- have a proper count of local overloadings. | |
12773 | ||
12774 | if No (Prev) then | |
12775 | Set_Name_Entity_Id (Chars (Disc), Outer); | |
12776 | ||
12777 | elsif Scope (Prev) /= Scope (Disc) then | |
12778 | Set_Homonym (Prev, Outer); | |
12779 | end if; | |
12780 | ||
12781 | Next_Discriminant (Disc); | |
12782 | end loop; | |
12783 | end if; | |
12784 | end Uninstall_Discriminants; | |
12785 | ||
12786 | ------------------------------------------- | |
12787 | -- Uninstall_Discriminants_And_Pop_Scope -- | |
12788 | ------------------------------------------- | |
12789 | ||
12790 | procedure Uninstall_Discriminants_And_Pop_Scope (E : Entity_Id) is | |
12791 | begin | |
12792 | if Has_Discriminants (E) then | |
12793 | Uninstall_Discriminants (E); | |
12794 | Pop_Scope; | |
12795 | end if; | |
12796 | end Uninstall_Discriminants_And_Pop_Scope; | |
12797 | ||
83f8f0a6 | 12798 | ------------------------------ |
12799 | -- Validate_Address_Clauses -- | |
12800 | ------------------------------ | |
12801 | ||
12802 | procedure Validate_Address_Clauses is | |
12803 | begin | |
12804 | for J in Address_Clause_Checks.First .. Address_Clause_Checks.Last loop | |
12805 | declare | |
12806 | ACCR : Address_Clause_Check_Record | |
12807 | renames Address_Clause_Checks.Table (J); | |
12808 | ||
d6da7448 | 12809 | Expr : Node_Id; |
12810 | ||
83f8f0a6 | 12811 | X_Alignment : Uint; |
12812 | Y_Alignment : Uint; | |
12813 | ||
12814 | X_Size : Uint; | |
12815 | Y_Size : Uint; | |
12816 | ||
12817 | begin | |
12818 | -- Skip processing of this entry if warning already posted | |
12819 | ||
12820 | if not Address_Warning_Posted (ACCR.N) then | |
d6da7448 | 12821 | Expr := Original_Node (Expression (ACCR.N)); |
83f8f0a6 | 12822 | |
d6da7448 | 12823 | -- Get alignments |
83f8f0a6 | 12824 | |
d6da7448 | 12825 | X_Alignment := Alignment (ACCR.X); |
12826 | Y_Alignment := Alignment (ACCR.Y); | |
83f8f0a6 | 12827 | |
12828 | -- Similarly obtain sizes | |
12829 | ||
d6da7448 | 12830 | X_Size := Esize (ACCR.X); |
12831 | Y_Size := Esize (ACCR.Y); | |
83f8f0a6 | 12832 | |
12833 | -- Check for large object overlaying smaller one | |
12834 | ||
12835 | if Y_Size > Uint_0 | |
12836 | and then X_Size > Uint_0 | |
12837 | and then X_Size > Y_Size | |
12838 | then | |
d6da7448 | 12839 | Error_Msg_NE |
1581f2d7 | 12840 | ("??& overlays smaller object", ACCR.N, ACCR.X); |
83f8f0a6 | 12841 | Error_Msg_N |
1e3532e7 | 12842 | ("\??program execution may be erroneous", ACCR.N); |
83f8f0a6 | 12843 | Error_Msg_Uint_1 := X_Size; |
12844 | Error_Msg_NE | |
1e3532e7 | 12845 | ("\??size of & is ^", ACCR.N, ACCR.X); |
83f8f0a6 | 12846 | Error_Msg_Uint_1 := Y_Size; |
12847 | Error_Msg_NE | |
1e3532e7 | 12848 | ("\??size of & is ^", ACCR.N, ACCR.Y); |
83f8f0a6 | 12849 | |
d6da7448 | 12850 | -- Check for inadequate alignment, both of the base object |
e556831e | 12851 | -- and of the offset, if any. We only do this check if the |
12852 | -- run-time Alignment_Check is active. No point in warning | |
12853 | -- if this check has been suppressed (or is suppressed by | |
12854 | -- default in the non-strict alignment machine case). | |
83f8f0a6 | 12855 | |
d6da7448 | 12856 | -- Note: we do not check the alignment if we gave a size |
12857 | -- warning, since it would likely be redundant. | |
83f8f0a6 | 12858 | |
e556831e | 12859 | elsif not Alignment_Checks_Suppressed (ACCR.Y) |
12860 | and then Y_Alignment /= Uint_0 | |
d6da7448 | 12861 | and then (Y_Alignment < X_Alignment |
12862 | or else (ACCR.Off | |
12863 | and then | |
12864 | Nkind (Expr) = N_Attribute_Reference | |
12865 | and then | |
12866 | Attribute_Name (Expr) = Name_Address | |
12867 | and then | |
12868 | Has_Compatible_Alignment | |
12869 | (ACCR.X, Prefix (Expr)) | |
12870 | /= Known_Compatible)) | |
83f8f0a6 | 12871 | then |
12872 | Error_Msg_NE | |
1e3532e7 | 12873 | ("??specified address for& may be inconsistent " |
12874 | & "with alignment", ACCR.N, ACCR.X); | |
83f8f0a6 | 12875 | Error_Msg_N |
1e3532e7 | 12876 | ("\??program execution may be erroneous (RM 13.3(27))", |
83f8f0a6 | 12877 | ACCR.N); |
12878 | Error_Msg_Uint_1 := X_Alignment; | |
12879 | Error_Msg_NE | |
1e3532e7 | 12880 | ("\??alignment of & is ^", ACCR.N, ACCR.X); |
83f8f0a6 | 12881 | Error_Msg_Uint_1 := Y_Alignment; |
12882 | Error_Msg_NE | |
1e3532e7 | 12883 | ("\??alignment of & is ^", ACCR.N, ACCR.Y); |
d6da7448 | 12884 | if Y_Alignment >= X_Alignment then |
12885 | Error_Msg_N | |
1e3532e7 | 12886 | ("\??but offset is not multiple of alignment", ACCR.N); |
d6da7448 | 12887 | end if; |
83f8f0a6 | 12888 | end if; |
12889 | end if; | |
12890 | end; | |
12891 | end loop; | |
12892 | end Validate_Address_Clauses; | |
12893 | ||
7717ea00 | 12894 | --------------------------- |
12895 | -- Validate_Independence -- | |
12896 | --------------------------- | |
12897 | ||
12898 | procedure Validate_Independence is | |
12899 | SU : constant Uint := UI_From_Int (System_Storage_Unit); | |
12900 | N : Node_Id; | |
12901 | E : Entity_Id; | |
12902 | IC : Boolean; | |
12903 | Comp : Entity_Id; | |
12904 | Addr : Node_Id; | |
12905 | P : Node_Id; | |
12906 | ||
12907 | procedure Check_Array_Type (Atyp : Entity_Id); | |
12908 | -- Checks if the array type Atyp has independent components, and | |
12909 | -- if not, outputs an appropriate set of error messages. | |
12910 | ||
12911 | procedure No_Independence; | |
12912 | -- Output message that independence cannot be guaranteed | |
12913 | ||
12914 | function OK_Component (C : Entity_Id) return Boolean; | |
12915 | -- Checks one component to see if it is independently accessible, and | |
12916 | -- if so yields True, otherwise yields False if independent access | |
12917 | -- cannot be guaranteed. This is a conservative routine, it only | |
12918 | -- returns True if it knows for sure, it returns False if it knows | |
12919 | -- there is a problem, or it cannot be sure there is no problem. | |
12920 | ||
12921 | procedure Reason_Bad_Component (C : Entity_Id); | |
12922 | -- Outputs continuation message if a reason can be determined for | |
12923 | -- the component C being bad. | |
12924 | ||
12925 | ---------------------- | |
12926 | -- Check_Array_Type -- | |
12927 | ---------------------- | |
12928 | ||
12929 | procedure Check_Array_Type (Atyp : Entity_Id) is | |
12930 | Ctyp : constant Entity_Id := Component_Type (Atyp); | |
12931 | ||
12932 | begin | |
12933 | -- OK if no alignment clause, no pack, and no component size | |
12934 | ||
12935 | if not Has_Component_Size_Clause (Atyp) | |
12936 | and then not Has_Alignment_Clause (Atyp) | |
12937 | and then not Is_Packed (Atyp) | |
12938 | then | |
12939 | return; | |
12940 | end if; | |
12941 | ||
aa0a69ab | 12942 | -- Case of component size is greater than or equal to 64 and the |
12943 | -- alignment of the array is at least as large as the alignment | |
12944 | -- of the component. We are definitely OK in this situation. | |
12945 | ||
12946 | if Known_Component_Size (Atyp) | |
12947 | and then Component_Size (Atyp) >= 64 | |
12948 | and then Known_Alignment (Atyp) | |
12949 | and then Known_Alignment (Ctyp) | |
12950 | and then Alignment (Atyp) >= Alignment (Ctyp) | |
12951 | then | |
12952 | return; | |
12953 | end if; | |
12954 | ||
7717ea00 | 12955 | -- Check actual component size |
12956 | ||
12957 | if not Known_Component_Size (Atyp) | |
12958 | or else not (Addressable (Component_Size (Atyp)) | |
aa0a69ab | 12959 | and then Component_Size (Atyp) < 64) |
7717ea00 | 12960 | or else Component_Size (Atyp) mod Esize (Ctyp) /= 0 |
12961 | then | |
12962 | No_Independence; | |
12963 | ||
12964 | -- Bad component size, check reason | |
12965 | ||
12966 | if Has_Component_Size_Clause (Atyp) then | |
b9e61b2a | 12967 | P := Get_Attribute_Definition_Clause |
12968 | (Atyp, Attribute_Component_Size); | |
7717ea00 | 12969 | |
12970 | if Present (P) then | |
12971 | Error_Msg_Sloc := Sloc (P); | |
12972 | Error_Msg_N ("\because of Component_Size clause#", N); | |
12973 | return; | |
12974 | end if; | |
12975 | end if; | |
12976 | ||
12977 | if Is_Packed (Atyp) then | |
12978 | P := Get_Rep_Pragma (Atyp, Name_Pack); | |
12979 | ||
12980 | if Present (P) then | |
12981 | Error_Msg_Sloc := Sloc (P); | |
12982 | Error_Msg_N ("\because of pragma Pack#", N); | |
12983 | return; | |
12984 | end if; | |
12985 | end if; | |
12986 | ||
12987 | -- No reason found, just return | |
12988 | ||
12989 | return; | |
12990 | end if; | |
12991 | ||
12992 | -- Array type is OK independence-wise | |
12993 | ||
12994 | return; | |
12995 | end Check_Array_Type; | |
12996 | ||
12997 | --------------------- | |
12998 | -- No_Independence -- | |
12999 | --------------------- | |
13000 | ||
13001 | procedure No_Independence is | |
13002 | begin | |
13003 | if Pragma_Name (N) = Name_Independent then | |
18393965 | 13004 | Error_Msg_NE ("independence cannot be guaranteed for&", N, E); |
7717ea00 | 13005 | else |
13006 | Error_Msg_NE | |
13007 | ("independent components cannot be guaranteed for&", N, E); | |
13008 | end if; | |
13009 | end No_Independence; | |
13010 | ||
13011 | ------------------ | |
13012 | -- OK_Component -- | |
13013 | ------------------ | |
13014 | ||
13015 | function OK_Component (C : Entity_Id) return Boolean is | |
13016 | Rec : constant Entity_Id := Scope (C); | |
13017 | Ctyp : constant Entity_Id := Etype (C); | |
13018 | ||
13019 | begin | |
13020 | -- OK if no component clause, no Pack, and no alignment clause | |
13021 | ||
13022 | if No (Component_Clause (C)) | |
13023 | and then not Is_Packed (Rec) | |
13024 | and then not Has_Alignment_Clause (Rec) | |
13025 | then | |
13026 | return True; | |
13027 | end if; | |
13028 | ||
13029 | -- Here we look at the actual component layout. A component is | |
13030 | -- addressable if its size is a multiple of the Esize of the | |
13031 | -- component type, and its starting position in the record has | |
13032 | -- appropriate alignment, and the record itself has appropriate | |
13033 | -- alignment to guarantee the component alignment. | |
13034 | ||
13035 | -- Make sure sizes are static, always assume the worst for any | |
13036 | -- cases where we cannot check static values. | |
13037 | ||
13038 | if not (Known_Static_Esize (C) | |
b9e61b2a | 13039 | and then |
13040 | Known_Static_Esize (Ctyp)) | |
7717ea00 | 13041 | then |
13042 | return False; | |
13043 | end if; | |
13044 | ||
13045 | -- Size of component must be addressable or greater than 64 bits | |
13046 | -- and a multiple of bytes. | |
13047 | ||
b9e61b2a | 13048 | if not Addressable (Esize (C)) and then Esize (C) < Uint_64 then |
7717ea00 | 13049 | return False; |
13050 | end if; | |
13051 | ||
13052 | -- Check size is proper multiple | |
13053 | ||
13054 | if Esize (C) mod Esize (Ctyp) /= 0 then | |
13055 | return False; | |
13056 | end if; | |
13057 | ||
13058 | -- Check alignment of component is OK | |
13059 | ||
13060 | if not Known_Component_Bit_Offset (C) | |
13061 | or else Component_Bit_Offset (C) < Uint_0 | |
13062 | or else Component_Bit_Offset (C) mod Esize (Ctyp) /= 0 | |
13063 | then | |
13064 | return False; | |
13065 | end if; | |
13066 | ||
13067 | -- Check alignment of record type is OK | |
13068 | ||
13069 | if not Known_Alignment (Rec) | |
13070 | or else (Alignment (Rec) * SU) mod Esize (Ctyp) /= 0 | |
13071 | then | |
13072 | return False; | |
13073 | end if; | |
13074 | ||
13075 | -- All tests passed, component is addressable | |
13076 | ||
13077 | return True; | |
13078 | end OK_Component; | |
13079 | ||
13080 | -------------------------- | |
13081 | -- Reason_Bad_Component -- | |
13082 | -------------------------- | |
13083 | ||
13084 | procedure Reason_Bad_Component (C : Entity_Id) is | |
13085 | Rec : constant Entity_Id := Scope (C); | |
13086 | Ctyp : constant Entity_Id := Etype (C); | |
13087 | ||
13088 | begin | |
13089 | -- If component clause present assume that's the problem | |
13090 | ||
13091 | if Present (Component_Clause (C)) then | |
13092 | Error_Msg_Sloc := Sloc (Component_Clause (C)); | |
13093 | Error_Msg_N ("\because of Component_Clause#", N); | |
13094 | return; | |
13095 | end if; | |
13096 | ||
13097 | -- If pragma Pack clause present, assume that's the problem | |
13098 | ||
13099 | if Is_Packed (Rec) then | |
13100 | P := Get_Rep_Pragma (Rec, Name_Pack); | |
13101 | ||
13102 | if Present (P) then | |
13103 | Error_Msg_Sloc := Sloc (P); | |
13104 | Error_Msg_N ("\because of pragma Pack#", N); | |
13105 | return; | |
13106 | end if; | |
13107 | end if; | |
13108 | ||
13109 | -- See if record has bad alignment clause | |
13110 | ||
13111 | if Has_Alignment_Clause (Rec) | |
13112 | and then Known_Alignment (Rec) | |
13113 | and then (Alignment (Rec) * SU) mod Esize (Ctyp) /= 0 | |
13114 | then | |
13115 | P := Get_Attribute_Definition_Clause (Rec, Attribute_Alignment); | |
13116 | ||
13117 | if Present (P) then | |
13118 | Error_Msg_Sloc := Sloc (P); | |
13119 | Error_Msg_N ("\because of Alignment clause#", N); | |
13120 | end if; | |
13121 | end if; | |
13122 | ||
13123 | -- Couldn't find a reason, so return without a message | |
13124 | ||
13125 | return; | |
13126 | end Reason_Bad_Component; | |
13127 | ||
13128 | -- Start of processing for Validate_Independence | |
13129 | ||
13130 | begin | |
13131 | for J in Independence_Checks.First .. Independence_Checks.Last loop | |
13132 | N := Independence_Checks.Table (J).N; | |
13133 | E := Independence_Checks.Table (J).E; | |
13134 | IC := Pragma_Name (N) = Name_Independent_Components; | |
13135 | ||
13136 | -- Deal with component case | |
13137 | ||
13138 | if Ekind (E) = E_Discriminant or else Ekind (E) = E_Component then | |
13139 | if not OK_Component (E) then | |
13140 | No_Independence; | |
13141 | Reason_Bad_Component (E); | |
13142 | goto Continue; | |
13143 | end if; | |
13144 | end if; | |
13145 | ||
13146 | -- Deal with record with Independent_Components | |
13147 | ||
13148 | if IC and then Is_Record_Type (E) then | |
13149 | Comp := First_Component_Or_Discriminant (E); | |
13150 | while Present (Comp) loop | |
13151 | if not OK_Component (Comp) then | |
13152 | No_Independence; | |
13153 | Reason_Bad_Component (Comp); | |
13154 | goto Continue; | |
13155 | end if; | |
13156 | ||
13157 | Next_Component_Or_Discriminant (Comp); | |
13158 | end loop; | |
13159 | end if; | |
13160 | ||
13161 | -- Deal with address clause case | |
13162 | ||
13163 | if Is_Object (E) then | |
13164 | Addr := Address_Clause (E); | |
13165 | ||
13166 | if Present (Addr) then | |
13167 | No_Independence; | |
13168 | Error_Msg_Sloc := Sloc (Addr); | |
13169 | Error_Msg_N ("\because of Address clause#", N); | |
13170 | goto Continue; | |
13171 | end if; | |
13172 | end if; | |
13173 | ||
13174 | -- Deal with independent components for array type | |
13175 | ||
13176 | if IC and then Is_Array_Type (E) then | |
13177 | Check_Array_Type (E); | |
13178 | end if; | |
13179 | ||
13180 | -- Deal with independent components for array object | |
13181 | ||
13182 | if IC and then Is_Object (E) and then Is_Array_Type (Etype (E)) then | |
13183 | Check_Array_Type (Etype (E)); | |
13184 | end if; | |
13185 | ||
13186 | <<Continue>> null; | |
13187 | end loop; | |
13188 | end Validate_Independence; | |
13189 | ||
b3f8228a | 13190 | ------------------------------ |
13191 | -- Validate_Iterable_Aspect -- | |
13192 | ------------------------------ | |
13193 | ||
13194 | procedure Validate_Iterable_Aspect (Typ : Entity_Id; ASN : Node_Id) is | |
3061ffde | 13195 | Assoc : Node_Id; |
13196 | Expr : Node_Id; | |
b3f8228a | 13197 | |
bde03454 | 13198 | Prim : Node_Id; |
a9f5fea7 | 13199 | Cursor : constant Entity_Id := Get_Cursor_Type (ASN, Typ); |
b3f8228a | 13200 | |
13201 | First_Id : Entity_Id; | |
13202 | Next_Id : Entity_Id; | |
13203 | Has_Element_Id : Entity_Id; | |
13204 | Element_Id : Entity_Id; | |
13205 | ||
b3f8228a | 13206 | begin |
9698629c | 13207 | -- If previous error aspect is unusable |
a9f5fea7 | 13208 | |
13209 | if Cursor = Any_Type then | |
3061ffde | 13210 | return; |
13211 | end if; | |
b3f8228a | 13212 | |
13213 | First_Id := Empty; | |
13214 | Next_Id := Empty; | |
13215 | Has_Element_Id := Empty; | |
32de816b | 13216 | Element_Id := Empty; |
b3f8228a | 13217 | |
13218 | -- Each expression must resolve to a function with the proper signature | |
13219 | ||
13220 | Assoc := First (Component_Associations (Expression (ASN))); | |
13221 | while Present (Assoc) loop | |
13222 | Expr := Expression (Assoc); | |
13223 | Analyze (Expr); | |
13224 | ||
b3f8228a | 13225 | Prim := First (Choices (Assoc)); |
bde03454 | 13226 | |
f02a9a9a | 13227 | if Nkind (Prim) /= N_Identifier or else Present (Next (Prim)) then |
b3f8228a | 13228 | Error_Msg_N ("illegal name in association", Prim); |
13229 | ||
13230 | elsif Chars (Prim) = Name_First then | |
3061ffde | 13231 | Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_First); |
b3f8228a | 13232 | First_Id := Entity (Expr); |
b3f8228a | 13233 | |
13234 | elsif Chars (Prim) = Name_Next then | |
3061ffde | 13235 | Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_Next); |
b3f8228a | 13236 | Next_Id := Entity (Expr); |
b3f8228a | 13237 | |
13238 | elsif Chars (Prim) = Name_Has_Element then | |
3061ffde | 13239 | Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_Has_Element); |
b3f8228a | 13240 | Has_Element_Id := Entity (Expr); |
bde03454 | 13241 | |
b3f8228a | 13242 | elsif Chars (Prim) = Name_Element then |
3061ffde | 13243 | Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_Element); |
b3f8228a | 13244 | Element_Id := Entity (Expr); |
b3f8228a | 13245 | |
13246 | else | |
13247 | Error_Msg_N ("invalid name for iterable function", Prim); | |
13248 | end if; | |
13249 | ||
13250 | Next (Assoc); | |
13251 | end loop; | |
13252 | ||
13253 | if No (First_Id) then | |
3061ffde | 13254 | Error_Msg_N ("match for First primitive not found", ASN); |
b3f8228a | 13255 | |
13256 | elsif No (Next_Id) then | |
3061ffde | 13257 | Error_Msg_N ("match for Next primitive not found", ASN); |
b3f8228a | 13258 | |
13259 | elsif No (Has_Element_Id) then | |
3061ffde | 13260 | Error_Msg_N ("match for Has_Element primitive not found", ASN); |
13261 | ||
13262 | elsif No (Element_Id) then | |
13263 | null; -- Optional. | |
b3f8228a | 13264 | end if; |
13265 | end Validate_Iterable_Aspect; | |
13266 | ||
d6f39728 | 13267 | ----------------------------------- |
13268 | -- Validate_Unchecked_Conversion -- | |
13269 | ----------------------------------- | |
13270 | ||
13271 | procedure Validate_Unchecked_Conversion | |
13272 | (N : Node_Id; | |
13273 | Act_Unit : Entity_Id) | |
13274 | is | |
13275 | Source : Entity_Id; | |
13276 | Target : Entity_Id; | |
13277 | Vnode : Node_Id; | |
13278 | ||
13279 | begin | |
13280 | -- Obtain source and target types. Note that we call Ancestor_Subtype | |
13281 | -- here because the processing for generic instantiation always makes | |
13282 | -- subtypes, and we want the original frozen actual types. | |
13283 | ||
13284 | -- If we are dealing with private types, then do the check on their | |
13285 | -- fully declared counterparts if the full declarations have been | |
39a0c1d3 | 13286 | -- encountered (they don't have to be visible, but they must exist). |
d6f39728 | 13287 | |
13288 | Source := Ancestor_Subtype (Etype (First_Formal (Act_Unit))); | |
13289 | ||
13290 | if Is_Private_Type (Source) | |
13291 | and then Present (Underlying_Type (Source)) | |
13292 | then | |
13293 | Source := Underlying_Type (Source); | |
13294 | end if; | |
13295 | ||
13296 | Target := Ancestor_Subtype (Etype (Act_Unit)); | |
13297 | ||
fdd294d1 | 13298 | -- If either type is generic, the instantiation happens within a generic |
95deda50 | 13299 | -- unit, and there is nothing to check. The proper check will happen |
13300 | -- when the enclosing generic is instantiated. | |
d6f39728 | 13301 | |
13302 | if Is_Generic_Type (Source) or else Is_Generic_Type (Target) then | |
13303 | return; | |
13304 | end if; | |
13305 | ||
13306 | if Is_Private_Type (Target) | |
13307 | and then Present (Underlying_Type (Target)) | |
13308 | then | |
13309 | Target := Underlying_Type (Target); | |
13310 | end if; | |
13311 | ||
13312 | -- Source may be unconstrained array, but not target | |
13313 | ||
b9e61b2a | 13314 | if Is_Array_Type (Target) and then not Is_Constrained (Target) then |
d6f39728 | 13315 | Error_Msg_N |
13316 | ("unchecked conversion to unconstrained array not allowed", N); | |
13317 | return; | |
13318 | end if; | |
13319 | ||
fbc67f84 | 13320 | -- Warn if conversion between two different convention pointers |
13321 | ||
13322 | if Is_Access_Type (Target) | |
13323 | and then Is_Access_Type (Source) | |
13324 | and then Convention (Target) /= Convention (Source) | |
13325 | and then Warn_On_Unchecked_Conversion | |
13326 | then | |
74c7ae52 | 13327 | -- Give warnings for subprogram pointers only on most targets |
fdd294d1 | 13328 | |
13329 | if Is_Access_Subprogram_Type (Target) | |
13330 | or else Is_Access_Subprogram_Type (Source) | |
fdd294d1 | 13331 | then |
13332 | Error_Msg_N | |
cb97ae5c | 13333 | ("?z?conversion between pointers with different conventions!", |
1e3532e7 | 13334 | N); |
fdd294d1 | 13335 | end if; |
fbc67f84 | 13336 | end if; |
13337 | ||
3062c401 | 13338 | -- Warn if one of the operands is Ada.Calendar.Time. Do not emit a |
13339 | -- warning when compiling GNAT-related sources. | |
13340 | ||
13341 | if Warn_On_Unchecked_Conversion | |
13342 | and then not In_Predefined_Unit (N) | |
13343 | and then RTU_Loaded (Ada_Calendar) | |
f02a9a9a | 13344 | and then (Chars (Source) = Name_Time |
13345 | or else | |
13346 | Chars (Target) = Name_Time) | |
3062c401 | 13347 | then |
13348 | -- If Ada.Calendar is loaded and the name of one of the operands is | |
13349 | -- Time, there is a good chance that this is Ada.Calendar.Time. | |
13350 | ||
13351 | declare | |
f02a9a9a | 13352 | Calendar_Time : constant Entity_Id := Full_View (RTE (RO_CA_Time)); |
3062c401 | 13353 | begin |
13354 | pragma Assert (Present (Calendar_Time)); | |
13355 | ||
b9e61b2a | 13356 | if Source = Calendar_Time or else Target = Calendar_Time then |
3062c401 | 13357 | Error_Msg_N |
f02a9a9a | 13358 | ("?z?representation of 'Time values may change between " |
13359 | & "'G'N'A'T versions", N); | |
3062c401 | 13360 | end if; |
13361 | end; | |
13362 | end if; | |
13363 | ||
fdd294d1 | 13364 | -- Make entry in unchecked conversion table for later processing by |
13365 | -- Validate_Unchecked_Conversions, which will check sizes and alignments | |
13366 | -- (using values set by the back-end where possible). This is only done | |
13367 | -- if the appropriate warning is active. | |
d6f39728 | 13368 | |
9dfe12ae | 13369 | if Warn_On_Unchecked_Conversion then |
13370 | Unchecked_Conversions.Append | |
86d32751 | 13371 | (New_Val => UC_Entry'(Eloc => Sloc (N), |
13372 | Source => Source, | |
13373 | Target => Target, | |
13374 | Act_Unit => Act_Unit)); | |
9dfe12ae | 13375 | |
13376 | -- If both sizes are known statically now, then back end annotation | |
13377 | -- is not required to do a proper check but if either size is not | |
13378 | -- known statically, then we need the annotation. | |
13379 | ||
13380 | if Known_Static_RM_Size (Source) | |
1e3532e7 | 13381 | and then |
13382 | Known_Static_RM_Size (Target) | |
9dfe12ae | 13383 | then |
13384 | null; | |
13385 | else | |
13386 | Back_Annotate_Rep_Info := True; | |
13387 | end if; | |
13388 | end if; | |
d6f39728 | 13389 | |
fdd294d1 | 13390 | -- If unchecked conversion to access type, and access type is declared |
95deda50 | 13391 | -- in the same unit as the unchecked conversion, then set the flag |
13392 | -- No_Strict_Aliasing (no strict aliasing is implicit here) | |
28ed91d4 | 13393 | |
13394 | if Is_Access_Type (Target) and then | |
13395 | In_Same_Source_Unit (Target, N) | |
13396 | then | |
13397 | Set_No_Strict_Aliasing (Implementation_Base_Type (Target)); | |
13398 | end if; | |
3d875462 | 13399 | |
95deda50 | 13400 | -- Generate N_Validate_Unchecked_Conversion node for back end in case |
13401 | -- the back end needs to perform special validation checks. | |
3d875462 | 13402 | |
95deda50 | 13403 | -- Shouldn't this be in Exp_Ch13, since the check only gets done if we |
13404 | -- have full expansion and the back end is called ??? | |
3d875462 | 13405 | |
13406 | Vnode := | |
13407 | Make_Validate_Unchecked_Conversion (Sloc (N)); | |
13408 | Set_Source_Type (Vnode, Source); | |
13409 | Set_Target_Type (Vnode, Target); | |
13410 | ||
fdd294d1 | 13411 | -- If the unchecked conversion node is in a list, just insert before it. |
13412 | -- If not we have some strange case, not worth bothering about. | |
3d875462 | 13413 | |
13414 | if Is_List_Member (N) then | |
d6f39728 | 13415 | Insert_After (N, Vnode); |
13416 | end if; | |
13417 | end Validate_Unchecked_Conversion; | |
13418 | ||
13419 | ------------------------------------ | |
13420 | -- Validate_Unchecked_Conversions -- | |
13421 | ------------------------------------ | |
13422 | ||
13423 | procedure Validate_Unchecked_Conversions is | |
13424 | begin | |
13425 | for N in Unchecked_Conversions.First .. Unchecked_Conversions.Last loop | |
13426 | declare | |
13427 | T : UC_Entry renames Unchecked_Conversions.Table (N); | |
13428 | ||
86d32751 | 13429 | Eloc : constant Source_Ptr := T.Eloc; |
13430 | Source : constant Entity_Id := T.Source; | |
13431 | Target : constant Entity_Id := T.Target; | |
13432 | Act_Unit : constant Entity_Id := T.Act_Unit; | |
d6f39728 | 13433 | |
44705307 | 13434 | Source_Siz : Uint; |
13435 | Target_Siz : Uint; | |
d6f39728 | 13436 | |
13437 | begin | |
86d32751 | 13438 | -- Skip if function marked as warnings off |
13439 | ||
13440 | if Warnings_Off (Act_Unit) then | |
13441 | goto Continue; | |
13442 | end if; | |
13443 | ||
fdd294d1 | 13444 | -- This validation check, which warns if we have unequal sizes for |
13445 | -- unchecked conversion, and thus potentially implementation | |
d6f39728 | 13446 | -- dependent semantics, is one of the few occasions on which we |
fdd294d1 | 13447 | -- use the official RM size instead of Esize. See description in |
13448 | -- Einfo "Handling of Type'Size Values" for details. | |
d6f39728 | 13449 | |
f15731c4 | 13450 | if Serious_Errors_Detected = 0 |
d6f39728 | 13451 | and then Known_Static_RM_Size (Source) |
13452 | and then Known_Static_RM_Size (Target) | |
f25f4252 | 13453 | |
13454 | -- Don't do the check if warnings off for either type, note the | |
13455 | -- deliberate use of OR here instead of OR ELSE to get the flag | |
13456 | -- Warnings_Off_Used set for both types if appropriate. | |
13457 | ||
13458 | and then not (Has_Warnings_Off (Source) | |
13459 | or | |
13460 | Has_Warnings_Off (Target)) | |
d6f39728 | 13461 | then |
13462 | Source_Siz := RM_Size (Source); | |
13463 | Target_Siz := RM_Size (Target); | |
13464 | ||
13465 | if Source_Siz /= Target_Siz then | |
299480f9 | 13466 | Error_Msg |
cb97ae5c | 13467 | ("?z?types for unchecked conversion have different sizes!", |
299480f9 | 13468 | Eloc); |
d6f39728 | 13469 | |
13470 | if All_Errors_Mode then | |
13471 | Error_Msg_Name_1 := Chars (Source); | |
13472 | Error_Msg_Uint_1 := Source_Siz; | |
13473 | Error_Msg_Name_2 := Chars (Target); | |
13474 | Error_Msg_Uint_2 := Target_Siz; | |
cb97ae5c | 13475 | Error_Msg ("\size of % is ^, size of % is ^?z?", Eloc); |
d6f39728 | 13476 | |
13477 | Error_Msg_Uint_1 := UI_Abs (Source_Siz - Target_Siz); | |
13478 | ||
13479 | if Is_Discrete_Type (Source) | |
b9e61b2a | 13480 | and then |
13481 | Is_Discrete_Type (Target) | |
d6f39728 | 13482 | then |
13483 | if Source_Siz > Target_Siz then | |
299480f9 | 13484 | Error_Msg |
cb97ae5c | 13485 | ("\?z?^ high order bits of source will " |
1e3532e7 | 13486 | & "be ignored!", Eloc); |
d6f39728 | 13487 | |
9dfe12ae | 13488 | elsif Is_Unsigned_Type (Source) then |
299480f9 | 13489 | Error_Msg |
cb97ae5c | 13490 | ("\?z?source will be extended with ^ high order " |
1581f2d7 | 13491 | & "zero bits!", Eloc); |
d6f39728 | 13492 | |
13493 | else | |
299480f9 | 13494 | Error_Msg |
cb97ae5c | 13495 | ("\?z?source will be extended with ^ high order " |
1e3532e7 | 13496 | & "sign bits!", Eloc); |
d6f39728 | 13497 | end if; |
13498 | ||
13499 | elsif Source_Siz < Target_Siz then | |
13500 | if Is_Discrete_Type (Target) then | |
13501 | if Bytes_Big_Endian then | |
299480f9 | 13502 | Error_Msg |
cb97ae5c | 13503 | ("\?z?target value will include ^ undefined " |
1e3532e7 | 13504 | & "low order bits!", Eloc); |
d6f39728 | 13505 | else |
299480f9 | 13506 | Error_Msg |
cb97ae5c | 13507 | ("\?z?target value will include ^ undefined " |
1e3532e7 | 13508 | & "high order bits!", Eloc); |
d6f39728 | 13509 | end if; |
13510 | ||
13511 | else | |
299480f9 | 13512 | Error_Msg |
cb97ae5c | 13513 | ("\?z?^ trailing bits of target value will be " |
1e3532e7 | 13514 | & "undefined!", Eloc); |
d6f39728 | 13515 | end if; |
13516 | ||
13517 | else pragma Assert (Source_Siz > Target_Siz); | |
0388e54e | 13518 | if Is_Discrete_Type (Source) then |
13519 | if Bytes_Big_Endian then | |
13520 | Error_Msg | |
13521 | ("\?z?^ low order bits of source will be " | |
13522 | & "ignored!", Eloc); | |
13523 | else | |
13524 | Error_Msg | |
13525 | ("\?z?^ high order bits of source will be " | |
13526 | & "ignored!", Eloc); | |
13527 | end if; | |
13528 | ||
13529 | else | |
13530 | Error_Msg | |
13531 | ("\?z?^ trailing bits of source will be " | |
13532 | & "ignored!", Eloc); | |
13533 | end if; | |
d6f39728 | 13534 | end if; |
13535 | end if; | |
d6f39728 | 13536 | end if; |
13537 | end if; | |
13538 | ||
13539 | -- If both types are access types, we need to check the alignment. | |
13540 | -- If the alignment of both is specified, we can do it here. | |
13541 | ||
f15731c4 | 13542 | if Serious_Errors_Detected = 0 |
2a10e737 | 13543 | and then Is_Access_Type (Source) |
13544 | and then Is_Access_Type (Target) | |
d6f39728 | 13545 | and then Target_Strict_Alignment |
13546 | and then Present (Designated_Type (Source)) | |
13547 | and then Present (Designated_Type (Target)) | |
13548 | then | |
13549 | declare | |
13550 | D_Source : constant Entity_Id := Designated_Type (Source); | |
13551 | D_Target : constant Entity_Id := Designated_Type (Target); | |
13552 | ||
13553 | begin | |
13554 | if Known_Alignment (D_Source) | |
b9e61b2a | 13555 | and then |
13556 | Known_Alignment (D_Target) | |
d6f39728 | 13557 | then |
13558 | declare | |
13559 | Source_Align : constant Uint := Alignment (D_Source); | |
13560 | Target_Align : constant Uint := Alignment (D_Target); | |
13561 | ||
13562 | begin | |
13563 | if Source_Align < Target_Align | |
13564 | and then not Is_Tagged_Type (D_Source) | |
f25f4252 | 13565 | |
13566 | -- Suppress warning if warnings suppressed on either | |
13567 | -- type or either designated type. Note the use of | |
13568 | -- OR here instead of OR ELSE. That is intentional, | |
13569 | -- we would like to set flag Warnings_Off_Used in | |
13570 | -- all types for which warnings are suppressed. | |
13571 | ||
13572 | and then not (Has_Warnings_Off (D_Source) | |
13573 | or | |
13574 | Has_Warnings_Off (D_Target) | |
13575 | or | |
13576 | Has_Warnings_Off (Source) | |
13577 | or | |
13578 | Has_Warnings_Off (Target)) | |
d6f39728 | 13579 | then |
d6f39728 | 13580 | Error_Msg_Uint_1 := Target_Align; |
13581 | Error_Msg_Uint_2 := Source_Align; | |
299480f9 | 13582 | Error_Msg_Node_1 := D_Target; |
d6f39728 | 13583 | Error_Msg_Node_2 := D_Source; |
299480f9 | 13584 | Error_Msg |
cb97ae5c | 13585 | ("?z?alignment of & (^) is stricter than " |
1e3532e7 | 13586 | & "alignment of & (^)!", Eloc); |
f25f4252 | 13587 | Error_Msg |
cb97ae5c | 13588 | ("\?z?resulting access value may have invalid " |
1e3532e7 | 13589 | & "alignment!", Eloc); |
d6f39728 | 13590 | end if; |
13591 | end; | |
13592 | end if; | |
13593 | end; | |
13594 | end if; | |
13595 | end; | |
86d32751 | 13596 | |
13597 | <<Continue>> | |
13598 | null; | |
d6f39728 | 13599 | end loop; |
13600 | end Validate_Unchecked_Conversions; | |
13601 | ||
d6f39728 | 13602 | end Sem_Ch13; |